2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_device *dev,
65 u16 heads, u16 sectors);
66 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
67 static void ata_dev_xfermask(struct ata_device *dev);
69 static unsigned int ata_unique_id = 1;
70 static struct workqueue_struct *ata_wq;
72 int atapi_enabled = 1;
73 module_param(atapi_enabled, int, 0444);
74 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
77 module_param(atapi_dmadir, int, 0444);
78 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
81 module_param_named(fua, libata_fua, int, 0444);
82 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
84 MODULE_AUTHOR("Jeff Garzik");
85 MODULE_DESCRIPTION("Library module for ATA devices");
86 MODULE_LICENSE("GPL");
87 MODULE_VERSION(DRV_VERSION);
91 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
92 * @tf: Taskfile to convert
93 * @fis: Buffer into which data will output
94 * @pmp: Port multiplier port
96 * Converts a standard ATA taskfile to a Serial ATA
97 * FIS structure (Register - Host to Device).
100 * Inherited from caller.
103 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
105 fis[0] = 0x27; /* Register - Host to Device FIS */
106 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
107 bit 7 indicates Command FIS */
108 fis[2] = tf->command;
109 fis[3] = tf->feature;
116 fis[8] = tf->hob_lbal;
117 fis[9] = tf->hob_lbam;
118 fis[10] = tf->hob_lbah;
119 fis[11] = tf->hob_feature;
122 fis[13] = tf->hob_nsect;
133 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
134 * @fis: Buffer from which data will be input
135 * @tf: Taskfile to output
137 * Converts a serial ATA FIS structure to a standard ATA taskfile.
140 * Inherited from caller.
143 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
145 tf->command = fis[2]; /* status */
146 tf->feature = fis[3]; /* error */
153 tf->hob_lbal = fis[8];
154 tf->hob_lbam = fis[9];
155 tf->hob_lbah = fis[10];
158 tf->hob_nsect = fis[13];
161 static const u8 ata_rw_cmds[] = {
165 ATA_CMD_READ_MULTI_EXT,
166 ATA_CMD_WRITE_MULTI_EXT,
170 ATA_CMD_WRITE_MULTI_FUA_EXT,
174 ATA_CMD_PIO_READ_EXT,
175 ATA_CMD_PIO_WRITE_EXT,
188 ATA_CMD_WRITE_FUA_EXT
192 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
193 * @qc: command to examine and configure
195 * Examine the device configuration and tf->flags to calculate
196 * the proper read/write commands and protocol to use.
201 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
203 struct ata_taskfile *tf = &qc->tf;
204 struct ata_device *dev = qc->dev;
207 int index, fua, lba48, write;
209 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
210 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
211 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
213 if (dev->flags & ATA_DFLAG_PIO) {
214 tf->protocol = ATA_PROT_PIO;
215 index = dev->multi_count ? 0 : 8;
216 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
217 /* Unable to use DMA due to host limitation */
218 tf->protocol = ATA_PROT_PIO;
219 index = dev->multi_count ? 0 : 8;
221 tf->protocol = ATA_PROT_DMA;
225 cmd = ata_rw_cmds[index + fua + lba48 + write];
234 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
235 * @pio_mask: pio_mask
236 * @mwdma_mask: mwdma_mask
237 * @udma_mask: udma_mask
239 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
240 * unsigned int xfer_mask.
248 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
249 unsigned int mwdma_mask,
250 unsigned int udma_mask)
252 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
253 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
254 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
258 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
259 * @xfer_mask: xfer_mask to unpack
260 * @pio_mask: resulting pio_mask
261 * @mwdma_mask: resulting mwdma_mask
262 * @udma_mask: resulting udma_mask
264 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
265 * Any NULL distination masks will be ignored.
267 static void ata_unpack_xfermask(unsigned int xfer_mask,
268 unsigned int *pio_mask,
269 unsigned int *mwdma_mask,
270 unsigned int *udma_mask)
273 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
275 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
277 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
280 static const struct ata_xfer_ent {
284 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
285 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
286 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
291 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
292 * @xfer_mask: xfer_mask of interest
294 * Return matching XFER_* value for @xfer_mask. Only the highest
295 * bit of @xfer_mask is considered.
301 * Matching XFER_* value, 0 if no match found.
303 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
305 int highbit = fls(xfer_mask) - 1;
306 const struct ata_xfer_ent *ent;
308 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
309 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
310 return ent->base + highbit - ent->shift;
315 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
316 * @xfer_mode: XFER_* of interest
318 * Return matching xfer_mask for @xfer_mode.
324 * Matching xfer_mask, 0 if no match found.
326 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
328 const struct ata_xfer_ent *ent;
330 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
331 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
332 return 1 << (ent->shift + xfer_mode - ent->base);
337 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
338 * @xfer_mode: XFER_* of interest
340 * Return matching xfer_shift for @xfer_mode.
346 * Matching xfer_shift, -1 if no match found.
348 static int ata_xfer_mode2shift(unsigned int xfer_mode)
350 const struct ata_xfer_ent *ent;
352 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
353 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
359 * ata_mode_string - convert xfer_mask to string
360 * @xfer_mask: mask of bits supported; only highest bit counts.
362 * Determine string which represents the highest speed
363 * (highest bit in @modemask).
369 * Constant C string representing highest speed listed in
370 * @mode_mask, or the constant C string "<n/a>".
372 static const char *ata_mode_string(unsigned int xfer_mask)
374 static const char * const xfer_mode_str[] = {
394 highbit = fls(xfer_mask) - 1;
395 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
396 return xfer_mode_str[highbit];
400 static const char *sata_spd_string(unsigned int spd)
402 static const char * const spd_str[] = {
407 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
409 return spd_str[spd - 1];
412 void ata_dev_disable(struct ata_device *dev)
414 if (ata_dev_enabled(dev)) {
415 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
421 * ata_pio_devchk - PATA device presence detection
422 * @ap: ATA channel to examine
423 * @device: Device to examine (starting at zero)
425 * This technique was originally described in
426 * Hale Landis's ATADRVR (www.ata-atapi.com), and
427 * later found its way into the ATA/ATAPI spec.
429 * Write a pattern to the ATA shadow registers,
430 * and if a device is present, it will respond by
431 * correctly storing and echoing back the
432 * ATA shadow register contents.
438 static unsigned int ata_pio_devchk(struct ata_port *ap,
441 struct ata_ioports *ioaddr = &ap->ioaddr;
444 ap->ops->dev_select(ap, device);
446 outb(0x55, ioaddr->nsect_addr);
447 outb(0xaa, ioaddr->lbal_addr);
449 outb(0xaa, ioaddr->nsect_addr);
450 outb(0x55, ioaddr->lbal_addr);
452 outb(0x55, ioaddr->nsect_addr);
453 outb(0xaa, ioaddr->lbal_addr);
455 nsect = inb(ioaddr->nsect_addr);
456 lbal = inb(ioaddr->lbal_addr);
458 if ((nsect == 0x55) && (lbal == 0xaa))
459 return 1; /* we found a device */
461 return 0; /* nothing found */
465 * ata_mmio_devchk - PATA device presence detection
466 * @ap: ATA channel to examine
467 * @device: Device to examine (starting at zero)
469 * This technique was originally described in
470 * Hale Landis's ATADRVR (www.ata-atapi.com), and
471 * later found its way into the ATA/ATAPI spec.
473 * Write a pattern to the ATA shadow registers,
474 * and if a device is present, it will respond by
475 * correctly storing and echoing back the
476 * ATA shadow register contents.
482 static unsigned int ata_mmio_devchk(struct ata_port *ap,
485 struct ata_ioports *ioaddr = &ap->ioaddr;
488 ap->ops->dev_select(ap, device);
490 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
491 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
493 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
494 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
496 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
497 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
499 nsect = readb((void __iomem *) ioaddr->nsect_addr);
500 lbal = readb((void __iomem *) ioaddr->lbal_addr);
502 if ((nsect == 0x55) && (lbal == 0xaa))
503 return 1; /* we found a device */
505 return 0; /* nothing found */
509 * ata_devchk - PATA device presence detection
510 * @ap: ATA channel to examine
511 * @device: Device to examine (starting at zero)
513 * Dispatch ATA device presence detection, depending
514 * on whether we are using PIO or MMIO to talk to the
515 * ATA shadow registers.
521 static unsigned int ata_devchk(struct ata_port *ap,
524 if (ap->flags & ATA_FLAG_MMIO)
525 return ata_mmio_devchk(ap, device);
526 return ata_pio_devchk(ap, device);
530 * ata_dev_classify - determine device type based on ATA-spec signature
531 * @tf: ATA taskfile register set for device to be identified
533 * Determine from taskfile register contents whether a device is
534 * ATA or ATAPI, as per "Signature and persistence" section
535 * of ATA/PI spec (volume 1, sect 5.14).
541 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
542 * the event of failure.
545 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
547 /* Apple's open source Darwin code hints that some devices only
548 * put a proper signature into the LBA mid/high registers,
549 * So, we only check those. It's sufficient for uniqueness.
552 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
553 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
554 DPRINTK("found ATA device by sig\n");
558 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
559 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
560 DPRINTK("found ATAPI device by sig\n");
561 return ATA_DEV_ATAPI;
564 DPRINTK("unknown device\n");
565 return ATA_DEV_UNKNOWN;
569 * ata_dev_try_classify - Parse returned ATA device signature
570 * @ap: ATA channel to examine
571 * @device: Device to examine (starting at zero)
572 * @r_err: Value of error register on completion
574 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
575 * an ATA/ATAPI-defined set of values is placed in the ATA
576 * shadow registers, indicating the results of device detection
579 * Select the ATA device, and read the values from the ATA shadow
580 * registers. Then parse according to the Error register value,
581 * and the spec-defined values examined by ata_dev_classify().
587 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
591 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
593 struct ata_taskfile tf;
597 ap->ops->dev_select(ap, device);
599 memset(&tf, 0, sizeof(tf));
601 ap->ops->tf_read(ap, &tf);
606 /* see if device passed diags */
609 else if ((device == 0) && (err == 0x81))
614 /* determine if device is ATA or ATAPI */
615 class = ata_dev_classify(&tf);
617 if (class == ATA_DEV_UNKNOWN)
619 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
625 * ata_id_string - Convert IDENTIFY DEVICE page into string
626 * @id: IDENTIFY DEVICE results we will examine
627 * @s: string into which data is output
628 * @ofs: offset into identify device page
629 * @len: length of string to return. must be an even number.
631 * The strings in the IDENTIFY DEVICE page are broken up into
632 * 16-bit chunks. Run through the string, and output each
633 * 8-bit chunk linearly, regardless of platform.
639 void ata_id_string(const u16 *id, unsigned char *s,
640 unsigned int ofs, unsigned int len)
659 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
660 * @id: IDENTIFY DEVICE results we will examine
661 * @s: string into which data is output
662 * @ofs: offset into identify device page
663 * @len: length of string to return. must be an odd number.
665 * This function is identical to ata_id_string except that it
666 * trims trailing spaces and terminates the resulting string with
667 * null. @len must be actual maximum length (even number) + 1.
672 void ata_id_c_string(const u16 *id, unsigned char *s,
673 unsigned int ofs, unsigned int len)
679 ata_id_string(id, s, ofs, len - 1);
681 p = s + strnlen(s, len - 1);
682 while (p > s && p[-1] == ' ')
687 static u64 ata_id_n_sectors(const u16 *id)
689 if (ata_id_has_lba(id)) {
690 if (ata_id_has_lba48(id))
691 return ata_id_u64(id, 100);
693 return ata_id_u32(id, 60);
695 if (ata_id_current_chs_valid(id))
696 return ata_id_u32(id, 57);
698 return id[1] * id[3] * id[6];
703 * ata_noop_dev_select - Select device 0/1 on ATA bus
704 * @ap: ATA channel to manipulate
705 * @device: ATA device (numbered from zero) to select
707 * This function performs no actual function.
709 * May be used as the dev_select() entry in ata_port_operations.
714 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
720 * ata_std_dev_select - Select device 0/1 on ATA bus
721 * @ap: ATA channel to manipulate
722 * @device: ATA device (numbered from zero) to select
724 * Use the method defined in the ATA specification to
725 * make either device 0, or device 1, active on the
726 * ATA channel. Works with both PIO and MMIO.
728 * May be used as the dev_select() entry in ata_port_operations.
734 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
739 tmp = ATA_DEVICE_OBS;
741 tmp = ATA_DEVICE_OBS | ATA_DEV1;
743 if (ap->flags & ATA_FLAG_MMIO) {
744 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
746 outb(tmp, ap->ioaddr.device_addr);
748 ata_pause(ap); /* needed; also flushes, for mmio */
752 * ata_dev_select - Select device 0/1 on ATA bus
753 * @ap: ATA channel to manipulate
754 * @device: ATA device (numbered from zero) to select
755 * @wait: non-zero to wait for Status register BSY bit to clear
756 * @can_sleep: non-zero if context allows sleeping
758 * Use the method defined in the ATA specification to
759 * make either device 0, or device 1, active on the
762 * This is a high-level version of ata_std_dev_select(),
763 * which additionally provides the services of inserting
764 * the proper pauses and status polling, where needed.
770 void ata_dev_select(struct ata_port *ap, unsigned int device,
771 unsigned int wait, unsigned int can_sleep)
773 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
774 ap->id, device, wait);
779 ap->ops->dev_select(ap, device);
782 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
789 * ata_dump_id - IDENTIFY DEVICE info debugging output
790 * @id: IDENTIFY DEVICE page to dump
792 * Dump selected 16-bit words from the given IDENTIFY DEVICE
799 static inline void ata_dump_id(const u16 *id)
801 DPRINTK("49==0x%04x "
811 DPRINTK("80==0x%04x "
821 DPRINTK("88==0x%04x "
828 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
829 * @id: IDENTIFY data to compute xfer mask from
831 * Compute the xfermask for this device. This is not as trivial
832 * as it seems if we must consider early devices correctly.
834 * FIXME: pre IDE drive timing (do we care ?).
842 static unsigned int ata_id_xfermask(const u16 *id)
844 unsigned int pio_mask, mwdma_mask, udma_mask;
846 /* Usual case. Word 53 indicates word 64 is valid */
847 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
848 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
852 /* If word 64 isn't valid then Word 51 high byte holds
853 * the PIO timing number for the maximum. Turn it into
856 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
858 /* But wait.. there's more. Design your standards by
859 * committee and you too can get a free iordy field to
860 * process. However its the speeds not the modes that
861 * are supported... Note drivers using the timing API
862 * will get this right anyway
866 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
869 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
870 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
872 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
876 * ata_port_queue_task - Queue port_task
877 * @ap: The ata_port to queue port_task for
879 * Schedule @fn(@data) for execution after @delay jiffies using
880 * port_task. There is one port_task per port and it's the
881 * user(low level driver)'s responsibility to make sure that only
882 * one task is active at any given time.
884 * libata core layer takes care of synchronization between
885 * port_task and EH. ata_port_queue_task() may be ignored for EH
889 * Inherited from caller.
891 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
896 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
899 PREPARE_WORK(&ap->port_task, fn, data);
902 rc = queue_work(ata_wq, &ap->port_task);
904 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
906 /* rc == 0 means that another user is using port task */
911 * ata_port_flush_task - Flush port_task
912 * @ap: The ata_port to flush port_task for
914 * After this function completes, port_task is guranteed not to
915 * be running or scheduled.
918 * Kernel thread context (may sleep)
920 void ata_port_flush_task(struct ata_port *ap)
926 spin_lock_irqsave(&ap->host_set->lock, flags);
927 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
928 spin_unlock_irqrestore(&ap->host_set->lock, flags);
930 DPRINTK("flush #1\n");
931 flush_workqueue(ata_wq);
934 * At this point, if a task is running, it's guaranteed to see
935 * the FLUSH flag; thus, it will never queue pio tasks again.
938 if (!cancel_delayed_work(&ap->port_task)) {
939 DPRINTK("flush #2\n");
940 flush_workqueue(ata_wq);
943 spin_lock_irqsave(&ap->host_set->lock, flags);
944 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
945 spin_unlock_irqrestore(&ap->host_set->lock, flags);
950 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
952 struct completion *waiting = qc->private_data;
958 * ata_exec_internal - execute libata internal command
959 * @dev: Device to which the command is sent
960 * @tf: Taskfile registers for the command and the result
961 * @cdb: CDB for packet command
962 * @dma_dir: Data tranfer direction of the command
963 * @buf: Data buffer of the command
964 * @buflen: Length of data buffer
966 * Executes libata internal command with timeout. @tf contains
967 * command on entry and result on return. Timeout and error
968 * conditions are reported via return value. No recovery action
969 * is taken after a command times out. It's caller's duty to
970 * clean up after timeout.
973 * None. Should be called with kernel context, might sleep.
976 unsigned ata_exec_internal(struct ata_device *dev,
977 struct ata_taskfile *tf, const u8 *cdb,
978 int dma_dir, void *buf, unsigned int buflen)
980 struct ata_port *ap = dev->ap;
981 u8 command = tf->command;
982 struct ata_queued_cmd *qc;
983 unsigned int tag, preempted_tag;
984 u32 preempted_sactive, preempted_qc_active;
985 DECLARE_COMPLETION(wait);
987 unsigned int err_mask;
990 spin_lock_irqsave(&ap->host_set->lock, flags);
992 /* no internal command while frozen */
993 if (ap->flags & ATA_FLAG_FROZEN) {
994 spin_unlock_irqrestore(&ap->host_set->lock, flags);
995 return AC_ERR_SYSTEM;
998 /* initialize internal qc */
1000 /* XXX: Tag 0 is used for drivers with legacy EH as some
1001 * drivers choke if any other tag is given. This breaks
1002 * ata_tag_internal() test for those drivers. Don't use new
1003 * EH stuff without converting to it.
1005 if (ap->ops->error_handler)
1006 tag = ATA_TAG_INTERNAL;
1010 if (test_and_set_bit(tag, &ap->qc_allocated))
1012 qc = __ata_qc_from_tag(ap, tag);
1020 preempted_tag = ap->active_tag;
1021 preempted_sactive = ap->sactive;
1022 preempted_qc_active = ap->qc_active;
1023 ap->active_tag = ATA_TAG_POISON;
1027 /* prepare & issue qc */
1030 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1031 qc->flags |= ATA_QCFLAG_RESULT_TF;
1032 qc->dma_dir = dma_dir;
1033 if (dma_dir != DMA_NONE) {
1034 ata_sg_init_one(qc, buf, buflen);
1035 qc->nsect = buflen / ATA_SECT_SIZE;
1038 qc->private_data = &wait;
1039 qc->complete_fn = ata_qc_complete_internal;
1043 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1045 rc = wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL);
1047 ata_port_flush_task(ap);
1050 spin_lock_irqsave(&ap->host_set->lock, flags);
1052 /* We're racing with irq here. If we lose, the
1053 * following test prevents us from completing the qc
1054 * twice. If we win, the port is frozen and will be
1055 * cleaned up by ->post_internal_cmd().
1057 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1058 qc->err_mask |= AC_ERR_TIMEOUT;
1060 if (ap->ops->error_handler)
1061 ata_port_freeze(ap);
1063 ata_qc_complete(qc);
1065 ata_dev_printk(dev, KERN_WARNING,
1066 "qc timeout (cmd 0x%x)\n", command);
1069 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1072 /* do post_internal_cmd */
1073 if (ap->ops->post_internal_cmd)
1074 ap->ops->post_internal_cmd(qc);
1076 if (qc->flags & ATA_QCFLAG_FAILED && !qc->err_mask) {
1077 ata_dev_printk(dev, KERN_WARNING, "zero err_mask for failed "
1078 "internal command, assuming AC_ERR_OTHER\n");
1079 qc->err_mask |= AC_ERR_OTHER;
1083 spin_lock_irqsave(&ap->host_set->lock, flags);
1085 *tf = qc->result_tf;
1086 err_mask = qc->err_mask;
1089 ap->active_tag = preempted_tag;
1090 ap->sactive = preempted_sactive;
1091 ap->qc_active = preempted_qc_active;
1093 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1094 * Until those drivers are fixed, we detect the condition
1095 * here, fail the command with AC_ERR_SYSTEM and reenable the
1098 * Note that this doesn't change any behavior as internal
1099 * command failure results in disabling the device in the
1100 * higher layer for LLDDs without new reset/EH callbacks.
1102 * Kill the following code as soon as those drivers are fixed.
1104 if (ap->flags & ATA_FLAG_DISABLED) {
1105 err_mask |= AC_ERR_SYSTEM;
1109 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1115 * ata_pio_need_iordy - check if iordy needed
1118 * Check if the current speed of the device requires IORDY. Used
1119 * by various controllers for chip configuration.
1122 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1125 int speed = adev->pio_mode - XFER_PIO_0;
1132 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1134 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1135 pio = adev->id[ATA_ID_EIDE_PIO];
1136 /* Is the speed faster than the drive allows non IORDY ? */
1138 /* This is cycle times not frequency - watch the logic! */
1139 if (pio > 240) /* PIO2 is 240nS per cycle */
1148 * ata_dev_read_id - Read ID data from the specified device
1149 * @dev: target device
1150 * @p_class: pointer to class of the target device (may be changed)
1151 * @post_reset: is this read ID post-reset?
1152 * @id: buffer to read IDENTIFY data into
1154 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1155 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1156 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1157 * for pre-ATA4 drives.
1160 * Kernel thread context (may sleep)
1163 * 0 on success, -errno otherwise.
1165 static int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1166 int post_reset, u16 *id)
1168 struct ata_port *ap = dev->ap;
1169 unsigned int class = *p_class;
1170 struct ata_taskfile tf;
1171 unsigned int err_mask = 0;
1175 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1177 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1180 ata_tf_init(dev, &tf);
1184 tf.command = ATA_CMD_ID_ATA;
1187 tf.command = ATA_CMD_ID_ATAPI;
1191 reason = "unsupported class";
1195 tf.protocol = ATA_PROT_PIO;
1197 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1198 id, sizeof(id[0]) * ATA_ID_WORDS);
1201 reason = "I/O error";
1205 swap_buf_le16(id, ATA_ID_WORDS);
1208 if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
1210 reason = "device reports illegal type";
1214 if (post_reset && class == ATA_DEV_ATA) {
1216 * The exact sequence expected by certain pre-ATA4 drives is:
1219 * INITIALIZE DEVICE PARAMETERS
1221 * Some drives were very specific about that exact sequence.
1223 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1224 err_mask = ata_dev_init_params(dev, id[3], id[6]);
1227 reason = "INIT_DEV_PARAMS failed";
1231 /* current CHS translation info (id[53-58]) might be
1232 * changed. reread the identify device info.
1244 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
1245 "(%s, err_mask=0x%x)\n", reason, err_mask);
1249 static inline u8 ata_dev_knobble(struct ata_device *dev)
1251 return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1254 static void ata_dev_config_ncq(struct ata_device *dev,
1255 char *desc, size_t desc_sz)
1257 struct ata_port *ap = dev->ap;
1258 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
1260 if (!ata_id_has_ncq(dev->id)) {
1265 if (ap->flags & ATA_FLAG_NCQ) {
1266 hdepth = min(ap->host->can_queue, ATA_MAX_QUEUE - 1);
1267 dev->flags |= ATA_DFLAG_NCQ;
1270 if (hdepth >= ddepth)
1271 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
1273 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
1277 * ata_dev_configure - Configure the specified ATA/ATAPI device
1278 * @dev: Target device to configure
1279 * @print_info: Enable device info printout
1281 * Configure @dev according to @dev->id. Generic and low-level
1282 * driver specific fixups are also applied.
1285 * Kernel thread context (may sleep)
1288 * 0 on success, -errno otherwise
1290 static int ata_dev_configure(struct ata_device *dev, int print_info)
1292 struct ata_port *ap = dev->ap;
1293 const u16 *id = dev->id;
1294 unsigned int xfer_mask;
1297 if (!ata_dev_enabled(dev)) {
1298 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1299 ap->id, dev->devno);
1303 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1305 /* print device capabilities */
1307 ata_dev_printk(dev, KERN_DEBUG, "cfg 49:%04x 82:%04x 83:%04x "
1308 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1309 id[49], id[82], id[83], id[84],
1310 id[85], id[86], id[87], id[88]);
1312 /* initialize to-be-configured parameters */
1313 dev->flags &= ~ATA_DFLAG_CFG_MASK;
1314 dev->max_sectors = 0;
1322 * common ATA, ATAPI feature tests
1325 /* find max transfer mode; for printk only */
1326 xfer_mask = ata_id_xfermask(id);
1330 /* ATA-specific feature tests */
1331 if (dev->class == ATA_DEV_ATA) {
1332 dev->n_sectors = ata_id_n_sectors(id);
1334 if (ata_id_has_lba(id)) {
1335 const char *lba_desc;
1339 dev->flags |= ATA_DFLAG_LBA;
1340 if (ata_id_has_lba48(id)) {
1341 dev->flags |= ATA_DFLAG_LBA48;
1346 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
1348 /* print device info to dmesg */
1350 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
1351 "max %s, %Lu sectors: %s %s\n",
1352 ata_id_major_version(id),
1353 ata_mode_string(xfer_mask),
1354 (unsigned long long)dev->n_sectors,
1355 lba_desc, ncq_desc);
1359 /* Default translation */
1360 dev->cylinders = id[1];
1362 dev->sectors = id[6];
1364 if (ata_id_current_chs_valid(id)) {
1365 /* Current CHS translation is valid. */
1366 dev->cylinders = id[54];
1367 dev->heads = id[55];
1368 dev->sectors = id[56];
1371 /* print device info to dmesg */
1373 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
1374 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1375 ata_id_major_version(id),
1376 ata_mode_string(xfer_mask),
1377 (unsigned long long)dev->n_sectors,
1378 dev->cylinders, dev->heads, dev->sectors);
1381 if (dev->id[59] & 0x100) {
1382 dev->multi_count = dev->id[59] & 0xff;
1383 DPRINTK("ata%u: dev %u multi count %u\n",
1384 ap->id, dev->devno, dev->multi_count);
1390 /* ATAPI-specific feature tests */
1391 else if (dev->class == ATA_DEV_ATAPI) {
1392 char *cdb_intr_string = "";
1394 rc = atapi_cdb_len(id);
1395 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1396 ata_dev_printk(dev, KERN_WARNING,
1397 "unsupported CDB len\n");
1401 dev->cdb_len = (unsigned int) rc;
1403 if (ata_id_cdb_intr(dev->id)) {
1404 dev->flags |= ATA_DFLAG_CDB_INTR;
1405 cdb_intr_string = ", CDB intr";
1408 /* print device info to dmesg */
1410 ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s%s\n",
1411 ata_mode_string(xfer_mask),
1415 ap->host->max_cmd_len = 0;
1416 for (i = 0; i < ATA_MAX_DEVICES; i++)
1417 ap->host->max_cmd_len = max_t(unsigned int,
1418 ap->host->max_cmd_len,
1419 ap->device[i].cdb_len);
1421 /* limit bridge transfers to udma5, 200 sectors */
1422 if (ata_dev_knobble(dev)) {
1424 ata_dev_printk(dev, KERN_INFO,
1425 "applying bridge limits\n");
1426 dev->udma_mask &= ATA_UDMA5;
1427 dev->max_sectors = ATA_MAX_SECTORS;
1430 if (ap->ops->dev_config)
1431 ap->ops->dev_config(ap, dev);
1433 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1437 DPRINTK("EXIT, err\n");
1442 * ata_bus_probe - Reset and probe ATA bus
1445 * Master ATA bus probing function. Initiates a hardware-dependent
1446 * bus reset, then attempts to identify any devices found on
1450 * PCI/etc. bus probe sem.
1453 * Zero on success, negative errno otherwise.
1456 static int ata_bus_probe(struct ata_port *ap)
1458 unsigned int classes[ATA_MAX_DEVICES];
1459 int tries[ATA_MAX_DEVICES];
1460 int i, rc, down_xfermask;
1461 struct ata_device *dev;
1465 for (i = 0; i < ATA_MAX_DEVICES; i++)
1466 tries[i] = ATA_PROBE_MAX_TRIES;
1471 /* reset and determine device classes */
1472 for (i = 0; i < ATA_MAX_DEVICES; i++)
1473 classes[i] = ATA_DEV_UNKNOWN;
1475 if (ap->ops->probe_reset) {
1476 rc = ap->ops->probe_reset(ap, classes);
1478 ata_port_printk(ap, KERN_ERR,
1479 "reset failed (errno=%d)\n", rc);
1483 ap->ops->phy_reset(ap);
1485 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1486 if (!(ap->flags & ATA_FLAG_DISABLED))
1487 classes[i] = ap->device[i].class;
1488 ap->device[i].class = ATA_DEV_UNKNOWN;
1494 for (i = 0; i < ATA_MAX_DEVICES; i++)
1495 if (classes[i] == ATA_DEV_UNKNOWN)
1496 classes[i] = ATA_DEV_NONE;
1498 /* read IDENTIFY page and configure devices */
1499 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1500 dev = &ap->device[i];
1503 dev->class = classes[i];
1505 if (!ata_dev_enabled(dev))
1508 rc = ata_dev_read_id(dev, &dev->class, 1, dev->id);
1512 rc = ata_dev_configure(dev, 1);
1517 /* configure transfer mode */
1518 rc = ata_set_mode(ap, &dev);
1524 for (i = 0; i < ATA_MAX_DEVICES; i++)
1525 if (ata_dev_enabled(&ap->device[i]))
1528 /* no device present, disable port */
1529 ata_port_disable(ap);
1530 ap->ops->port_disable(ap);
1537 tries[dev->devno] = 0;
1540 sata_down_spd_limit(ap);
1543 tries[dev->devno]--;
1544 if (down_xfermask &&
1545 ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
1546 tries[dev->devno] = 0;
1549 if (!tries[dev->devno]) {
1550 ata_down_xfermask_limit(dev, 1);
1551 ata_dev_disable(dev);
1558 * ata_port_probe - Mark port as enabled
1559 * @ap: Port for which we indicate enablement
1561 * Modify @ap data structure such that the system
1562 * thinks that the entire port is enabled.
1564 * LOCKING: host_set lock, or some other form of
1568 void ata_port_probe(struct ata_port *ap)
1570 ap->flags &= ~ATA_FLAG_DISABLED;
1574 * sata_print_link_status - Print SATA link status
1575 * @ap: SATA port to printk link status about
1577 * This function prints link speed and status of a SATA link.
1582 static void sata_print_link_status(struct ata_port *ap)
1584 u32 sstatus, scontrol, tmp;
1586 if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1588 sata_scr_read(ap, SCR_CONTROL, &scontrol);
1590 if (ata_port_online(ap)) {
1591 tmp = (sstatus >> 4) & 0xf;
1592 ata_port_printk(ap, KERN_INFO,
1593 "SATA link up %s (SStatus %X SControl %X)\n",
1594 sata_spd_string(tmp), sstatus, scontrol);
1596 ata_port_printk(ap, KERN_INFO,
1597 "SATA link down (SStatus %X SControl %X)\n",
1603 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1604 * @ap: SATA port associated with target SATA PHY.
1606 * This function issues commands to standard SATA Sxxx
1607 * PHY registers, to wake up the phy (and device), and
1608 * clear any reset condition.
1611 * PCI/etc. bus probe sem.
1614 void __sata_phy_reset(struct ata_port *ap)
1617 unsigned long timeout = jiffies + (HZ * 5);
1619 if (ap->flags & ATA_FLAG_SATA_RESET) {
1620 /* issue phy wake/reset */
1621 sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1622 /* Couldn't find anything in SATA I/II specs, but
1623 * AHCI-1.1 10.4.2 says at least 1 ms. */
1626 /* phy wake/clear reset */
1627 sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
1629 /* wait for phy to become ready, if necessary */
1632 sata_scr_read(ap, SCR_STATUS, &sstatus);
1633 if ((sstatus & 0xf) != 1)
1635 } while (time_before(jiffies, timeout));
1637 /* print link status */
1638 sata_print_link_status(ap);
1640 /* TODO: phy layer with polling, timeouts, etc. */
1641 if (!ata_port_offline(ap))
1644 ata_port_disable(ap);
1646 if (ap->flags & ATA_FLAG_DISABLED)
1649 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1650 ata_port_disable(ap);
1654 ap->cbl = ATA_CBL_SATA;
1658 * sata_phy_reset - Reset SATA bus.
1659 * @ap: SATA port associated with target SATA PHY.
1661 * This function resets the SATA bus, and then probes
1662 * the bus for devices.
1665 * PCI/etc. bus probe sem.
1668 void sata_phy_reset(struct ata_port *ap)
1670 __sata_phy_reset(ap);
1671 if (ap->flags & ATA_FLAG_DISABLED)
1677 * ata_dev_pair - return other device on cable
1680 * Obtain the other device on the same cable, or if none is
1681 * present NULL is returned
1684 struct ata_device *ata_dev_pair(struct ata_device *adev)
1686 struct ata_port *ap = adev->ap;
1687 struct ata_device *pair = &ap->device[1 - adev->devno];
1688 if (!ata_dev_enabled(pair))
1694 * ata_port_disable - Disable port.
1695 * @ap: Port to be disabled.
1697 * Modify @ap data structure such that the system
1698 * thinks that the entire port is disabled, and should
1699 * never attempt to probe or communicate with devices
1702 * LOCKING: host_set lock, or some other form of
1706 void ata_port_disable(struct ata_port *ap)
1708 ap->device[0].class = ATA_DEV_NONE;
1709 ap->device[1].class = ATA_DEV_NONE;
1710 ap->flags |= ATA_FLAG_DISABLED;
1714 * sata_down_spd_limit - adjust SATA spd limit downward
1715 * @ap: Port to adjust SATA spd limit for
1717 * Adjust SATA spd limit of @ap downward. Note that this
1718 * function only adjusts the limit. The change must be applied
1719 * using sata_set_spd().
1722 * Inherited from caller.
1725 * 0 on success, negative errno on failure
1727 int sata_down_spd_limit(struct ata_port *ap)
1729 u32 sstatus, spd, mask;
1732 rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
1736 mask = ap->sata_spd_limit;
1739 highbit = fls(mask) - 1;
1740 mask &= ~(1 << highbit);
1742 spd = (sstatus >> 4) & 0xf;
1746 mask &= (1 << spd) - 1;
1750 ap->sata_spd_limit = mask;
1752 ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
1753 sata_spd_string(fls(mask)));
1758 static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
1762 if (ap->sata_spd_limit == UINT_MAX)
1765 limit = fls(ap->sata_spd_limit);
1767 spd = (*scontrol >> 4) & 0xf;
1768 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
1770 return spd != limit;
1774 * sata_set_spd_needed - is SATA spd configuration needed
1775 * @ap: Port in question
1777 * Test whether the spd limit in SControl matches
1778 * @ap->sata_spd_limit. This function is used to determine
1779 * whether hardreset is necessary to apply SATA spd
1783 * Inherited from caller.
1786 * 1 if SATA spd configuration is needed, 0 otherwise.
1788 int sata_set_spd_needed(struct ata_port *ap)
1792 if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
1795 return __sata_set_spd_needed(ap, &scontrol);
1799 * sata_set_spd - set SATA spd according to spd limit
1800 * @ap: Port to set SATA spd for
1802 * Set SATA spd of @ap according to sata_spd_limit.
1805 * Inherited from caller.
1808 * 0 if spd doesn't need to be changed, 1 if spd has been
1809 * changed. Negative errno if SCR registers are inaccessible.
1811 int sata_set_spd(struct ata_port *ap)
1816 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
1819 if (!__sata_set_spd_needed(ap, &scontrol))
1822 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
1829 * This mode timing computation functionality is ported over from
1830 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1833 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1834 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1835 * for PIO 5, which is a nonstandard extension and UDMA6, which
1836 * is currently supported only by Maxtor drives.
1839 static const struct ata_timing ata_timing[] = {
1841 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1842 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1843 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1844 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1846 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1847 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1848 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1850 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1852 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1853 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1854 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1856 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1857 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1858 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1860 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1861 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1862 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1864 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1865 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1866 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1868 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1873 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1874 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1876 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1878 q->setup = EZ(t->setup * 1000, T);
1879 q->act8b = EZ(t->act8b * 1000, T);
1880 q->rec8b = EZ(t->rec8b * 1000, T);
1881 q->cyc8b = EZ(t->cyc8b * 1000, T);
1882 q->active = EZ(t->active * 1000, T);
1883 q->recover = EZ(t->recover * 1000, T);
1884 q->cycle = EZ(t->cycle * 1000, T);
1885 q->udma = EZ(t->udma * 1000, UT);
1888 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1889 struct ata_timing *m, unsigned int what)
1891 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1892 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1893 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1894 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1895 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1896 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1897 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1898 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1901 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1903 const struct ata_timing *t;
1905 for (t = ata_timing; t->mode != speed; t++)
1906 if (t->mode == 0xFF)
1911 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1912 struct ata_timing *t, int T, int UT)
1914 const struct ata_timing *s;
1915 struct ata_timing p;
1921 if (!(s = ata_timing_find_mode(speed)))
1924 memcpy(t, s, sizeof(*s));
1927 * If the drive is an EIDE drive, it can tell us it needs extended
1928 * PIO/MW_DMA cycle timing.
1931 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1932 memset(&p, 0, sizeof(p));
1933 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1934 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1935 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1936 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1937 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1939 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1943 * Convert the timing to bus clock counts.
1946 ata_timing_quantize(t, t, T, UT);
1949 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1950 * S.M.A.R.T * and some other commands. We have to ensure that the
1951 * DMA cycle timing is slower/equal than the fastest PIO timing.
1954 if (speed > XFER_PIO_4) {
1955 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1956 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1960 * Lengthen active & recovery time so that cycle time is correct.
1963 if (t->act8b + t->rec8b < t->cyc8b) {
1964 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1965 t->rec8b = t->cyc8b - t->act8b;
1968 if (t->active + t->recover < t->cycle) {
1969 t->active += (t->cycle - (t->active + t->recover)) / 2;
1970 t->recover = t->cycle - t->active;
1977 * ata_down_xfermask_limit - adjust dev xfer masks downward
1978 * @dev: Device to adjust xfer masks
1979 * @force_pio0: Force PIO0
1981 * Adjust xfer masks of @dev downward. Note that this function
1982 * does not apply the change. Invoking ata_set_mode() afterwards
1983 * will apply the limit.
1986 * Inherited from caller.
1989 * 0 on success, negative errno on failure
1991 int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
1993 unsigned long xfer_mask;
1996 xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
2001 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2002 if (xfer_mask & ATA_MASK_UDMA)
2003 xfer_mask &= ~ATA_MASK_MWDMA;
2005 highbit = fls(xfer_mask) - 1;
2006 xfer_mask &= ~(1 << highbit);
2008 xfer_mask &= 1 << ATA_SHIFT_PIO;
2012 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2015 ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
2016 ata_mode_string(xfer_mask));
2024 static int ata_dev_set_mode(struct ata_device *dev)
2026 unsigned int err_mask;
2029 dev->flags &= ~ATA_DFLAG_PIO;
2030 if (dev->xfer_shift == ATA_SHIFT_PIO)
2031 dev->flags |= ATA_DFLAG_PIO;
2033 err_mask = ata_dev_set_xfermode(dev);
2035 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
2036 "(err_mask=0x%x)\n", err_mask);
2040 rc = ata_dev_revalidate(dev, 0);
2044 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2045 dev->xfer_shift, (int)dev->xfer_mode);
2047 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
2048 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2053 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2054 * @ap: port on which timings will be programmed
2055 * @r_failed_dev: out paramter for failed device
2057 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2058 * ata_set_mode() fails, pointer to the failing device is
2059 * returned in @r_failed_dev.
2062 * PCI/etc. bus probe sem.
2065 * 0 on success, negative errno otherwise
2067 int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
2069 struct ata_device *dev;
2070 int i, rc = 0, used_dma = 0, found = 0;
2072 /* has private set_mode? */
2073 if (ap->ops->set_mode) {
2074 /* FIXME: make ->set_mode handle no device case and
2075 * return error code and failing device on failure.
2077 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2078 if (ata_dev_enabled(&ap->device[i])) {
2079 ap->ops->set_mode(ap);
2086 /* step 1: calculate xfer_mask */
2087 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2088 unsigned int pio_mask, dma_mask;
2090 dev = &ap->device[i];
2092 if (!ata_dev_enabled(dev))
2095 ata_dev_xfermask(dev);
2097 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2098 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2099 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2100 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2109 /* step 2: always set host PIO timings */
2110 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2111 dev = &ap->device[i];
2112 if (!ata_dev_enabled(dev))
2115 if (!dev->pio_mode) {
2116 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2121 dev->xfer_mode = dev->pio_mode;
2122 dev->xfer_shift = ATA_SHIFT_PIO;
2123 if (ap->ops->set_piomode)
2124 ap->ops->set_piomode(ap, dev);
2127 /* step 3: set host DMA timings */
2128 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2129 dev = &ap->device[i];
2131 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2134 dev->xfer_mode = dev->dma_mode;
2135 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2136 if (ap->ops->set_dmamode)
2137 ap->ops->set_dmamode(ap, dev);
2140 /* step 4: update devices' xfer mode */
2141 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2142 dev = &ap->device[i];
2144 if (!ata_dev_enabled(dev))
2147 rc = ata_dev_set_mode(dev);
2152 /* Record simplex status. If we selected DMA then the other
2153 * host channels are not permitted to do so.
2155 if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
2156 ap->host_set->simplex_claimed = 1;
2158 /* step5: chip specific finalisation */
2159 if (ap->ops->post_set_mode)
2160 ap->ops->post_set_mode(ap);
2164 *r_failed_dev = dev;
2169 * ata_tf_to_host - issue ATA taskfile to host controller
2170 * @ap: port to which command is being issued
2171 * @tf: ATA taskfile register set
2173 * Issues ATA taskfile register set to ATA host controller,
2174 * with proper synchronization with interrupt handler and
2178 * spin_lock_irqsave(host_set lock)
2181 static inline void ata_tf_to_host(struct ata_port *ap,
2182 const struct ata_taskfile *tf)
2184 ap->ops->tf_load(ap, tf);
2185 ap->ops->exec_command(ap, tf);
2189 * ata_busy_sleep - sleep until BSY clears, or timeout
2190 * @ap: port containing status register to be polled
2191 * @tmout_pat: impatience timeout
2192 * @tmout: overall timeout
2194 * Sleep until ATA Status register bit BSY clears,
2195 * or a timeout occurs.
2200 unsigned int ata_busy_sleep (struct ata_port *ap,
2201 unsigned long tmout_pat, unsigned long tmout)
2203 unsigned long timer_start, timeout;
2206 status = ata_busy_wait(ap, ATA_BUSY, 300);
2207 timer_start = jiffies;
2208 timeout = timer_start + tmout_pat;
2209 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2211 status = ata_busy_wait(ap, ATA_BUSY, 3);
2214 if (status & ATA_BUSY)
2215 ata_port_printk(ap, KERN_WARNING,
2216 "port is slow to respond, please be patient\n");
2218 timeout = timer_start + tmout;
2219 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2221 status = ata_chk_status(ap);
2224 if (status & ATA_BUSY) {
2225 ata_port_printk(ap, KERN_ERR, "port failed to respond "
2226 "(%lu secs)\n", tmout / HZ);
2233 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2235 struct ata_ioports *ioaddr = &ap->ioaddr;
2236 unsigned int dev0 = devmask & (1 << 0);
2237 unsigned int dev1 = devmask & (1 << 1);
2238 unsigned long timeout;
2240 /* if device 0 was found in ata_devchk, wait for its
2244 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2246 /* if device 1 was found in ata_devchk, wait for
2247 * register access, then wait for BSY to clear
2249 timeout = jiffies + ATA_TMOUT_BOOT;
2253 ap->ops->dev_select(ap, 1);
2254 if (ap->flags & ATA_FLAG_MMIO) {
2255 nsect = readb((void __iomem *) ioaddr->nsect_addr);
2256 lbal = readb((void __iomem *) ioaddr->lbal_addr);
2258 nsect = inb(ioaddr->nsect_addr);
2259 lbal = inb(ioaddr->lbal_addr);
2261 if ((nsect == 1) && (lbal == 1))
2263 if (time_after(jiffies, timeout)) {
2267 msleep(50); /* give drive a breather */
2270 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2272 /* is all this really necessary? */
2273 ap->ops->dev_select(ap, 0);
2275 ap->ops->dev_select(ap, 1);
2277 ap->ops->dev_select(ap, 0);
2280 static unsigned int ata_bus_softreset(struct ata_port *ap,
2281 unsigned int devmask)
2283 struct ata_ioports *ioaddr = &ap->ioaddr;
2285 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2287 /* software reset. causes dev0 to be selected */
2288 if (ap->flags & ATA_FLAG_MMIO) {
2289 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2290 udelay(20); /* FIXME: flush */
2291 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2292 udelay(20); /* FIXME: flush */
2293 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2295 outb(ap->ctl, ioaddr->ctl_addr);
2297 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2299 outb(ap->ctl, ioaddr->ctl_addr);
2302 /* spec mandates ">= 2ms" before checking status.
2303 * We wait 150ms, because that was the magic delay used for
2304 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2305 * between when the ATA command register is written, and then
2306 * status is checked. Because waiting for "a while" before
2307 * checking status is fine, post SRST, we perform this magic
2308 * delay here as well.
2310 * Old drivers/ide uses the 2mS rule and then waits for ready
2314 /* Before we perform post reset processing we want to see if
2315 * the bus shows 0xFF because the odd clown forgets the D7
2316 * pulldown resistor.
2318 if (ata_check_status(ap) == 0xFF) {
2319 ata_port_printk(ap, KERN_ERR, "SRST failed (status 0xFF)\n");
2320 return AC_ERR_OTHER;
2323 ata_bus_post_reset(ap, devmask);
2329 * ata_bus_reset - reset host port and associated ATA channel
2330 * @ap: port to reset
2332 * This is typically the first time we actually start issuing
2333 * commands to the ATA channel. We wait for BSY to clear, then
2334 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2335 * result. Determine what devices, if any, are on the channel
2336 * by looking at the device 0/1 error register. Look at the signature
2337 * stored in each device's taskfile registers, to determine if
2338 * the device is ATA or ATAPI.
2341 * PCI/etc. bus probe sem.
2342 * Obtains host_set lock.
2345 * Sets ATA_FLAG_DISABLED if bus reset fails.
2348 void ata_bus_reset(struct ata_port *ap)
2350 struct ata_ioports *ioaddr = &ap->ioaddr;
2351 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2353 unsigned int dev0, dev1 = 0, devmask = 0;
2355 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2357 /* determine if device 0/1 are present */
2358 if (ap->flags & ATA_FLAG_SATA_RESET)
2361 dev0 = ata_devchk(ap, 0);
2363 dev1 = ata_devchk(ap, 1);
2367 devmask |= (1 << 0);
2369 devmask |= (1 << 1);
2371 /* select device 0 again */
2372 ap->ops->dev_select(ap, 0);
2374 /* issue bus reset */
2375 if (ap->flags & ATA_FLAG_SRST)
2376 if (ata_bus_softreset(ap, devmask))
2380 * determine by signature whether we have ATA or ATAPI devices
2382 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2383 if ((slave_possible) && (err != 0x81))
2384 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2386 /* re-enable interrupts */
2387 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2390 /* is double-select really necessary? */
2391 if (ap->device[1].class != ATA_DEV_NONE)
2392 ap->ops->dev_select(ap, 1);
2393 if (ap->device[0].class != ATA_DEV_NONE)
2394 ap->ops->dev_select(ap, 0);
2396 /* if no devices were detected, disable this port */
2397 if ((ap->device[0].class == ATA_DEV_NONE) &&
2398 (ap->device[1].class == ATA_DEV_NONE))
2401 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2402 /* set up device control for ATA_FLAG_SATA_RESET */
2403 if (ap->flags & ATA_FLAG_MMIO)
2404 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2406 outb(ap->ctl, ioaddr->ctl_addr);
2413 ata_port_printk(ap, KERN_ERR, "disabling port\n");
2414 ap->ops->port_disable(ap);
2419 static int sata_phy_resume(struct ata_port *ap)
2421 unsigned long timeout = jiffies + (HZ * 5);
2422 u32 scontrol, sstatus;
2425 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2428 scontrol = (scontrol & 0x0f0) | 0x300;
2430 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2433 /* Wait for phy to become ready, if necessary. */
2436 if ((rc = sata_scr_read(ap, SCR_STATUS, &sstatus)))
2438 if ((sstatus & 0xf) != 1)
2440 } while (time_before(jiffies, timeout));
2446 * ata_std_probeinit - initialize probing
2447 * @ap: port to be probed
2449 * @ap is about to be probed. Initialize it. This function is
2450 * to be used as standard callback for ata_drive_probe_reset().
2452 * NOTE!!! Do not use this function as probeinit if a low level
2453 * driver implements only hardreset. Just pass NULL as probeinit
2454 * in that case. Using this function is probably okay but doing
2455 * so makes reset sequence different from the original
2456 * ->phy_reset implementation and Jeff nervous. :-P
2458 void ata_std_probeinit(struct ata_port *ap)
2463 sata_phy_resume(ap);
2465 /* init sata_spd_limit to the current value */
2466 if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
2467 int spd = (scontrol >> 4) & 0xf;
2468 ap->sata_spd_limit &= (1 << spd) - 1;
2471 /* wait for device */
2472 if (ata_port_online(ap))
2473 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2477 * ata_std_softreset - reset host port via ATA SRST
2478 * @ap: port to reset
2479 * @classes: resulting classes of attached devices
2481 * Reset host port using ATA SRST. This function is to be used
2482 * as standard callback for ata_drive_*_reset() functions.
2485 * Kernel thread context (may sleep)
2488 * 0 on success, -errno otherwise.
2490 int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2492 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2493 unsigned int devmask = 0, err_mask;
2498 if (ata_port_offline(ap)) {
2499 classes[0] = ATA_DEV_NONE;
2503 /* determine if device 0/1 are present */
2504 if (ata_devchk(ap, 0))
2505 devmask |= (1 << 0);
2506 if (slave_possible && ata_devchk(ap, 1))
2507 devmask |= (1 << 1);
2509 /* select device 0 again */
2510 ap->ops->dev_select(ap, 0);
2512 /* issue bus reset */
2513 DPRINTK("about to softreset, devmask=%x\n", devmask);
2514 err_mask = ata_bus_softreset(ap, devmask);
2516 ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
2521 /* determine by signature whether we have ATA or ATAPI devices */
2522 classes[0] = ata_dev_try_classify(ap, 0, &err);
2523 if (slave_possible && err != 0x81)
2524 classes[1] = ata_dev_try_classify(ap, 1, &err);
2527 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2532 * sata_std_hardreset - reset host port via SATA phy reset
2533 * @ap: port to reset
2534 * @class: resulting class of attached device
2536 * SATA phy-reset host port using DET bits of SControl register.
2537 * This function is to be used as standard callback for
2538 * ata_drive_*_reset().
2541 * Kernel thread context (may sleep)
2544 * 0 on success, -errno otherwise.
2546 int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
2553 if (sata_set_spd_needed(ap)) {
2554 /* SATA spec says nothing about how to reconfigure
2555 * spd. To be on the safe side, turn off phy during
2556 * reconfiguration. This works for at least ICH7 AHCI
2559 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2562 scontrol = (scontrol & 0x0f0) | 0x302;
2564 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2570 /* issue phy wake/reset */
2571 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2574 scontrol = (scontrol & 0x0f0) | 0x301;
2576 if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
2579 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2580 * 10.4.2 says at least 1 ms.
2584 /* bring phy back */
2585 sata_phy_resume(ap);
2587 /* TODO: phy layer with polling, timeouts, etc. */
2588 if (ata_port_offline(ap)) {
2589 *class = ATA_DEV_NONE;
2590 DPRINTK("EXIT, link offline\n");
2594 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2595 ata_port_printk(ap, KERN_ERR,
2596 "COMRESET failed (device not ready)\n");
2600 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2602 *class = ata_dev_try_classify(ap, 0, NULL);
2604 DPRINTK("EXIT, class=%u\n", *class);
2609 * ata_std_postreset - standard postreset callback
2610 * @ap: the target ata_port
2611 * @classes: classes of attached devices
2613 * This function is invoked after a successful reset. Note that
2614 * the device might have been reset more than once using
2615 * different reset methods before postreset is invoked.
2617 * This function is to be used as standard callback for
2618 * ata_drive_*_reset().
2621 * Kernel thread context (may sleep)
2623 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2629 /* print link status */
2630 sata_print_link_status(ap);
2633 if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
2634 sata_scr_write(ap, SCR_ERROR, serror);
2636 /* re-enable interrupts */
2637 if (!ap->ops->error_handler) {
2638 /* FIXME: hack. create a hook instead */
2639 if (ap->ioaddr.ctl_addr)
2643 /* is double-select really necessary? */
2644 if (classes[0] != ATA_DEV_NONE)
2645 ap->ops->dev_select(ap, 1);
2646 if (classes[1] != ATA_DEV_NONE)
2647 ap->ops->dev_select(ap, 0);
2649 /* bail out if no device is present */
2650 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2651 DPRINTK("EXIT, no device\n");
2655 /* set up device control */
2656 if (ap->ioaddr.ctl_addr) {
2657 if (ap->flags & ATA_FLAG_MMIO)
2658 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2660 outb(ap->ctl, ap->ioaddr.ctl_addr);
2667 * ata_std_probe_reset - standard probe reset method
2668 * @ap: prot to perform probe-reset
2669 * @classes: resulting classes of attached devices
2671 * The stock off-the-shelf ->probe_reset method.
2674 * Kernel thread context (may sleep)
2677 * 0 on success, -errno otherwise.
2679 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2681 ata_reset_fn_t hardreset;
2684 if (sata_scr_valid(ap))
2685 hardreset = sata_std_hardreset;
2687 return ata_drive_probe_reset(ap, ata_std_probeinit,
2688 ata_std_softreset, hardreset,
2689 ata_std_postreset, classes);
2692 int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
2693 unsigned int *classes)
2697 for (i = 0; i < ATA_MAX_DEVICES; i++)
2698 classes[i] = ATA_DEV_UNKNOWN;
2700 rc = reset(ap, classes);
2704 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2705 * is complete and convert all ATA_DEV_UNKNOWN to
2708 for (i = 0; i < ATA_MAX_DEVICES; i++)
2709 if (classes[i] != ATA_DEV_UNKNOWN)
2712 if (i < ATA_MAX_DEVICES)
2713 for (i = 0; i < ATA_MAX_DEVICES; i++)
2714 if (classes[i] == ATA_DEV_UNKNOWN)
2715 classes[i] = ATA_DEV_NONE;
2721 * ata_drive_probe_reset - Perform probe reset with given methods
2722 * @ap: port to reset
2723 * @probeinit: probeinit method (can be NULL)
2724 * @softreset: softreset method (can be NULL)
2725 * @hardreset: hardreset method (can be NULL)
2726 * @postreset: postreset method (can be NULL)
2727 * @classes: resulting classes of attached devices
2729 * Reset the specified port and classify attached devices using
2730 * given methods. This function prefers softreset but tries all
2731 * possible reset sequences to reset and classify devices. This
2732 * function is intended to be used for constructing ->probe_reset
2733 * callback by low level drivers.
2735 * Reset methods should follow the following rules.
2737 * - Return 0 on sucess, -errno on failure.
2738 * - If classification is supported, fill classes[] with
2739 * recognized class codes.
2740 * - If classification is not supported, leave classes[] alone.
2743 * Kernel thread context (may sleep)
2746 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2747 * if classification fails, and any error code from reset
2750 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2751 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2752 ata_postreset_fn_t postreset, unsigned int *classes)
2756 ata_eh_freeze_port(ap);
2761 if (softreset && !sata_set_spd_needed(ap)) {
2762 rc = ata_do_reset(ap, softreset, classes);
2763 if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
2765 ata_port_printk(ap, KERN_INFO, "softreset failed, "
2766 "will try hardreset in 5 secs\n");
2774 rc = ata_do_reset(ap, hardreset, classes);
2776 if (classes[0] != ATA_DEV_UNKNOWN)
2781 if (sata_down_spd_limit(ap))
2784 ata_port_printk(ap, KERN_INFO, "hardreset failed, "
2785 "will retry in 5 secs\n");
2790 ata_port_printk(ap, KERN_INFO,
2791 "hardreset succeeded without classification, "
2792 "will retry softreset in 5 secs\n");
2795 rc = ata_do_reset(ap, softreset, classes);
2801 postreset(ap, classes);
2803 ata_eh_thaw_port(ap);
2805 if (classes[0] == ATA_DEV_UNKNOWN)
2812 * ata_dev_same_device - Determine whether new ID matches configured device
2813 * @dev: device to compare against
2814 * @new_class: class of the new device
2815 * @new_id: IDENTIFY page of the new device
2817 * Compare @new_class and @new_id against @dev and determine
2818 * whether @dev is the device indicated by @new_class and
2825 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2827 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
2830 const u16 *old_id = dev->id;
2831 unsigned char model[2][41], serial[2][21];
2834 if (dev->class != new_class) {
2835 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
2836 dev->class, new_class);
2840 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2841 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2842 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2843 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2844 new_n_sectors = ata_id_n_sectors(new_id);
2846 if (strcmp(model[0], model[1])) {
2847 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
2848 "'%s' != '%s'\n", model[0], model[1]);
2852 if (strcmp(serial[0], serial[1])) {
2853 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
2854 "'%s' != '%s'\n", serial[0], serial[1]);
2858 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2859 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
2861 (unsigned long long)dev->n_sectors,
2862 (unsigned long long)new_n_sectors);
2870 * ata_dev_revalidate - Revalidate ATA device
2871 * @dev: device to revalidate
2872 * @post_reset: is this revalidation after reset?
2874 * Re-read IDENTIFY page and make sure @dev is still attached to
2878 * Kernel thread context (may sleep)
2881 * 0 on success, negative errno otherwise
2883 int ata_dev_revalidate(struct ata_device *dev, int post_reset)
2885 unsigned int class = dev->class;
2886 u16 *id = (void *)dev->ap->sector_buf;
2889 if (!ata_dev_enabled(dev)) {
2895 rc = ata_dev_read_id(dev, &class, post_reset, id);
2899 /* is the device still there? */
2900 if (!ata_dev_same_device(dev, class, id)) {
2905 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
2907 /* configure device according to the new ID */
2908 rc = ata_dev_configure(dev, 0);
2913 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
2917 static const char * const ata_dma_blacklist [] = {
2918 "WDC AC11000H", NULL,
2919 "WDC AC22100H", NULL,
2920 "WDC AC32500H", NULL,
2921 "WDC AC33100H", NULL,
2922 "WDC AC31600H", NULL,
2923 "WDC AC32100H", "24.09P07",
2924 "WDC AC23200L", "21.10N21",
2925 "Compaq CRD-8241B", NULL,
2930 "SanDisk SDP3B", NULL,
2931 "SanDisk SDP3B-64", NULL,
2932 "SANYO CD-ROM CRD", NULL,
2933 "HITACHI CDR-8", NULL,
2934 "HITACHI CDR-8335", NULL,
2935 "HITACHI CDR-8435", NULL,
2936 "Toshiba CD-ROM XM-6202B", NULL,
2937 "TOSHIBA CD-ROM XM-1702BC", NULL,
2939 "E-IDE CD-ROM CR-840", NULL,
2940 "CD-ROM Drive/F5A", NULL,
2941 "WPI CDD-820", NULL,
2942 "SAMSUNG CD-ROM SC-148C", NULL,
2943 "SAMSUNG CD-ROM SC", NULL,
2944 "SanDisk SDP3B-64", NULL,
2945 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2946 "_NEC DV5800A", NULL,
2947 "SAMSUNG CD-ROM SN-124", "N001"
2950 static int ata_strim(char *s, size_t len)
2952 len = strnlen(s, len);
2954 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2955 while ((len > 0) && (s[len - 1] == ' ')) {
2962 static int ata_dma_blacklisted(const struct ata_device *dev)
2964 unsigned char model_num[40];
2965 unsigned char model_rev[16];
2966 unsigned int nlen, rlen;
2969 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2971 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2973 nlen = ata_strim(model_num, sizeof(model_num));
2974 rlen = ata_strim(model_rev, sizeof(model_rev));
2976 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2977 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2978 if (ata_dma_blacklist[i+1] == NULL)
2980 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2988 * ata_dev_xfermask - Compute supported xfermask of the given device
2989 * @dev: Device to compute xfermask for
2991 * Compute supported xfermask of @dev and store it in
2992 * dev->*_mask. This function is responsible for applying all
2993 * known limits including host controller limits, device
2996 * FIXME: The current implementation limits all transfer modes to
2997 * the fastest of the lowested device on the port. This is not
2998 * required on most controllers.
3003 static void ata_dev_xfermask(struct ata_device *dev)
3005 struct ata_port *ap = dev->ap;
3006 struct ata_host_set *hs = ap->host_set;
3007 unsigned long xfer_mask;
3010 xfer_mask = ata_pack_xfermask(ap->pio_mask,
3011 ap->mwdma_mask, ap->udma_mask);
3013 /* Apply cable rule here. Don't apply it early because when
3014 * we handle hot plug the cable type can itself change.
3016 if (ap->cbl == ATA_CBL_PATA40)
3017 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
3019 /* FIXME: Use port-wide xfermask for now */
3020 for (i = 0; i < ATA_MAX_DEVICES; i++) {
3021 struct ata_device *d = &ap->device[i];
3023 if (ata_dev_absent(d))
3026 if (ata_dev_disabled(d)) {
3027 /* to avoid violating device selection timing */
3028 xfer_mask &= ata_pack_xfermask(d->pio_mask,
3029 UINT_MAX, UINT_MAX);
3033 xfer_mask &= ata_pack_xfermask(d->pio_mask,
3034 d->mwdma_mask, d->udma_mask);
3035 xfer_mask &= ata_id_xfermask(d->id);
3036 if (ata_dma_blacklisted(d))
3037 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3040 if (ata_dma_blacklisted(dev))
3041 ata_dev_printk(dev, KERN_WARNING,
3042 "device is on DMA blacklist, disabling DMA\n");
3044 if (hs->flags & ATA_HOST_SIMPLEX) {
3045 if (hs->simplex_claimed)
3046 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3049 if (ap->ops->mode_filter)
3050 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
3052 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
3053 &dev->mwdma_mask, &dev->udma_mask);
3057 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3058 * @dev: Device to which command will be sent
3060 * Issue SET FEATURES - XFER MODE command to device @dev
3064 * PCI/etc. bus probe sem.
3067 * 0 on success, AC_ERR_* mask otherwise.
3070 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
3072 struct ata_taskfile tf;
3073 unsigned int err_mask;
3075 /* set up set-features taskfile */
3076 DPRINTK("set features - xfer mode\n");
3078 ata_tf_init(dev, &tf);
3079 tf.command = ATA_CMD_SET_FEATURES;
3080 tf.feature = SETFEATURES_XFER;
3081 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3082 tf.protocol = ATA_PROT_NODATA;
3083 tf.nsect = dev->xfer_mode;
3085 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3087 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3092 * ata_dev_init_params - Issue INIT DEV PARAMS command
3093 * @dev: Device to which command will be sent
3094 * @heads: Number of heads
3095 * @sectors: Number of sectors
3098 * Kernel thread context (may sleep)
3101 * 0 on success, AC_ERR_* mask otherwise.
3103 static unsigned int ata_dev_init_params(struct ata_device *dev,
3104 u16 heads, u16 sectors)
3106 struct ata_taskfile tf;
3107 unsigned int err_mask;
3109 /* Number of sectors per track 1-255. Number of heads 1-16 */
3110 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3111 return AC_ERR_INVALID;
3113 /* set up init dev params taskfile */
3114 DPRINTK("init dev params \n");
3116 ata_tf_init(dev, &tf);
3117 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3118 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3119 tf.protocol = ATA_PROT_NODATA;
3121 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
3123 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3125 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3130 * ata_sg_clean - Unmap DMA memory associated with command
3131 * @qc: Command containing DMA memory to be released
3133 * Unmap all mapped DMA memory associated with this command.
3136 * spin_lock_irqsave(host_set lock)
3139 static void ata_sg_clean(struct ata_queued_cmd *qc)
3141 struct ata_port *ap = qc->ap;
3142 struct scatterlist *sg = qc->__sg;
3143 int dir = qc->dma_dir;
3144 void *pad_buf = NULL;
3146 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3147 WARN_ON(sg == NULL);
3149 if (qc->flags & ATA_QCFLAG_SINGLE)
3150 WARN_ON(qc->n_elem > 1);
3152 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
3154 /* if we padded the buffer out to 32-bit bound, and data
3155 * xfer direction is from-device, we must copy from the
3156 * pad buffer back into the supplied buffer
3158 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
3159 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3161 if (qc->flags & ATA_QCFLAG_SG) {
3163 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3164 /* restore last sg */
3165 sg[qc->orig_n_elem - 1].length += qc->pad_len;
3167 struct scatterlist *psg = &qc->pad_sgent;
3168 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3169 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
3170 kunmap_atomic(addr, KM_IRQ0);
3174 dma_unmap_single(ap->dev,
3175 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
3178 sg->length += qc->pad_len;
3180 memcpy(qc->buf_virt + sg->length - qc->pad_len,
3181 pad_buf, qc->pad_len);
3184 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3189 * ata_fill_sg - Fill PCI IDE PRD table
3190 * @qc: Metadata associated with taskfile to be transferred
3192 * Fill PCI IDE PRD (scatter-gather) table with segments
3193 * associated with the current disk command.
3196 * spin_lock_irqsave(host_set lock)
3199 static void ata_fill_sg(struct ata_queued_cmd *qc)
3201 struct ata_port *ap = qc->ap;
3202 struct scatterlist *sg;
3205 WARN_ON(qc->__sg == NULL);
3206 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
3209 ata_for_each_sg(sg, qc) {
3213 /* determine if physical DMA addr spans 64K boundary.
3214 * Note h/w doesn't support 64-bit, so we unconditionally
3215 * truncate dma_addr_t to u32.
3217 addr = (u32) sg_dma_address(sg);
3218 sg_len = sg_dma_len(sg);
3221 offset = addr & 0xffff;
3223 if ((offset + sg_len) > 0x10000)
3224 len = 0x10000 - offset;
3226 ap->prd[idx].addr = cpu_to_le32(addr);
3227 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
3228 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
3237 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
3240 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3241 * @qc: Metadata associated with taskfile to check
3243 * Allow low-level driver to filter ATA PACKET commands, returning
3244 * a status indicating whether or not it is OK to use DMA for the
3245 * supplied PACKET command.
3248 * spin_lock_irqsave(host_set lock)
3250 * RETURNS: 0 when ATAPI DMA can be used
3253 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3255 struct ata_port *ap = qc->ap;
3256 int rc = 0; /* Assume ATAPI DMA is OK by default */
3258 if (ap->ops->check_atapi_dma)
3259 rc = ap->ops->check_atapi_dma(qc);
3261 /* We don't support polling DMA.
3262 * Use PIO if the LLDD handles only interrupts in
3263 * the HSM_ST_LAST state and the ATAPI device
3264 * generates CDB interrupts.
3266 if ((ap->flags & ATA_FLAG_PIO_POLLING) &&
3267 (qc->dev->flags & ATA_DFLAG_CDB_INTR))
3273 * ata_qc_prep - Prepare taskfile for submission
3274 * @qc: Metadata associated with taskfile to be prepared
3276 * Prepare ATA taskfile for submission.
3279 * spin_lock_irqsave(host_set lock)
3281 void ata_qc_prep(struct ata_queued_cmd *qc)
3283 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3289 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
3292 * ata_sg_init_one - Associate command with memory buffer
3293 * @qc: Command to be associated
3294 * @buf: Memory buffer
3295 * @buflen: Length of memory buffer, in bytes.
3297 * Initialize the data-related elements of queued_cmd @qc
3298 * to point to a single memory buffer, @buf of byte length @buflen.
3301 * spin_lock_irqsave(host_set lock)
3304 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3306 struct scatterlist *sg;
3308 qc->flags |= ATA_QCFLAG_SINGLE;
3310 memset(&qc->sgent, 0, sizeof(qc->sgent));
3311 qc->__sg = &qc->sgent;
3313 qc->orig_n_elem = 1;
3317 sg_init_one(sg, buf, buflen);
3321 * ata_sg_init - Associate command with scatter-gather table.
3322 * @qc: Command to be associated
3323 * @sg: Scatter-gather table.
3324 * @n_elem: Number of elements in s/g table.
3326 * Initialize the data-related elements of queued_cmd @qc
3327 * to point to a scatter-gather table @sg, containing @n_elem
3331 * spin_lock_irqsave(host_set lock)
3334 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3335 unsigned int n_elem)
3337 qc->flags |= ATA_QCFLAG_SG;
3339 qc->n_elem = n_elem;
3340 qc->orig_n_elem = n_elem;
3344 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3345 * @qc: Command with memory buffer to be mapped.
3347 * DMA-map the memory buffer associated with queued_cmd @qc.
3350 * spin_lock_irqsave(host_set lock)
3353 * Zero on success, negative on error.
3356 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3358 struct ata_port *ap = qc->ap;
3359 int dir = qc->dma_dir;
3360 struct scatterlist *sg = qc->__sg;
3361 dma_addr_t dma_address;
3364 /* we must lengthen transfers to end on a 32-bit boundary */
3365 qc->pad_len = sg->length & 3;
3367 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3368 struct scatterlist *psg = &qc->pad_sgent;
3370 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3372 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3374 if (qc->tf.flags & ATA_TFLAG_WRITE)
3375 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3378 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3379 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3381 sg->length -= qc->pad_len;
3382 if (sg->length == 0)
3385 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3386 sg->length, qc->pad_len);
3394 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3396 if (dma_mapping_error(dma_address)) {
3398 sg->length += qc->pad_len;
3402 sg_dma_address(sg) = dma_address;
3403 sg_dma_len(sg) = sg->length;
3406 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3407 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3413 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3414 * @qc: Command with scatter-gather table to be mapped.
3416 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3419 * spin_lock_irqsave(host_set lock)
3422 * Zero on success, negative on error.
3426 static int ata_sg_setup(struct ata_queued_cmd *qc)
3428 struct ata_port *ap = qc->ap;
3429 struct scatterlist *sg = qc->__sg;
3430 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3431 int n_elem, pre_n_elem, dir, trim_sg = 0;
3433 VPRINTK("ENTER, ata%u\n", ap->id);
3434 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3436 /* we must lengthen transfers to end on a 32-bit boundary */
3437 qc->pad_len = lsg->length & 3;
3439 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3440 struct scatterlist *psg = &qc->pad_sgent;
3441 unsigned int offset;
3443 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3445 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3448 * psg->page/offset are used to copy to-be-written
3449 * data in this function or read data in ata_sg_clean.
3451 offset = lsg->offset + lsg->length - qc->pad_len;
3452 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3453 psg->offset = offset_in_page(offset);
3455 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3456 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3457 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3458 kunmap_atomic(addr, KM_IRQ0);
3461 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3462 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3464 lsg->length -= qc->pad_len;
3465 if (lsg->length == 0)
3468 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3469 qc->n_elem - 1, lsg->length, qc->pad_len);
3472 pre_n_elem = qc->n_elem;
3473 if (trim_sg && pre_n_elem)
3482 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3484 /* restore last sg */
3485 lsg->length += qc->pad_len;
3489 DPRINTK("%d sg elements mapped\n", n_elem);
3492 qc->n_elem = n_elem;
3498 * swap_buf_le16 - swap halves of 16-bit words in place
3499 * @buf: Buffer to swap
3500 * @buf_words: Number of 16-bit words in buffer.
3502 * Swap halves of 16-bit words if needed to convert from
3503 * little-endian byte order to native cpu byte order, or
3507 * Inherited from caller.
3509 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3514 for (i = 0; i < buf_words; i++)
3515 buf[i] = le16_to_cpu(buf[i]);
3516 #endif /* __BIG_ENDIAN */
3520 * ata_mmio_data_xfer - Transfer data by MMIO
3521 * @ap: port to read/write
3523 * @buflen: buffer length
3524 * @write_data: read/write
3526 * Transfer data from/to the device data register by MMIO.
3529 * Inherited from caller.
3532 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3533 unsigned int buflen, int write_data)
3536 unsigned int words = buflen >> 1;
3537 u16 *buf16 = (u16 *) buf;
3538 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3540 /* Transfer multiple of 2 bytes */
3542 for (i = 0; i < words; i++)
3543 writew(le16_to_cpu(buf16[i]), mmio);
3545 for (i = 0; i < words; i++)
3546 buf16[i] = cpu_to_le16(readw(mmio));
3549 /* Transfer trailing 1 byte, if any. */
3550 if (unlikely(buflen & 0x01)) {
3551 u16 align_buf[1] = { 0 };
3552 unsigned char *trailing_buf = buf + buflen - 1;
3555 memcpy(align_buf, trailing_buf, 1);
3556 writew(le16_to_cpu(align_buf[0]), mmio);
3558 align_buf[0] = cpu_to_le16(readw(mmio));
3559 memcpy(trailing_buf, align_buf, 1);
3565 * ata_pio_data_xfer - Transfer data by PIO
3566 * @ap: port to read/write
3568 * @buflen: buffer length
3569 * @write_data: read/write
3571 * Transfer data from/to the device data register by PIO.
3574 * Inherited from caller.
3577 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3578 unsigned int buflen, int write_data)
3580 unsigned int words = buflen >> 1;
3582 /* Transfer multiple of 2 bytes */
3584 outsw(ap->ioaddr.data_addr, buf, words);
3586 insw(ap->ioaddr.data_addr, buf, words);
3588 /* Transfer trailing 1 byte, if any. */
3589 if (unlikely(buflen & 0x01)) {
3590 u16 align_buf[1] = { 0 };
3591 unsigned char *trailing_buf = buf + buflen - 1;
3594 memcpy(align_buf, trailing_buf, 1);
3595 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3597 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3598 memcpy(trailing_buf, align_buf, 1);
3604 * ata_data_xfer - Transfer data from/to the data register.
3605 * @ap: port to read/write
3607 * @buflen: buffer length
3608 * @do_write: read/write
3610 * Transfer data from/to the device data register.
3613 * Inherited from caller.
3616 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3617 unsigned int buflen, int do_write)
3619 /* Make the crap hardware pay the costs not the good stuff */
3620 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3621 unsigned long flags;
3622 local_irq_save(flags);
3623 if (ap->flags & ATA_FLAG_MMIO)
3624 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3626 ata_pio_data_xfer(ap, buf, buflen, do_write);
3627 local_irq_restore(flags);
3629 if (ap->flags & ATA_FLAG_MMIO)
3630 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3632 ata_pio_data_xfer(ap, buf, buflen, do_write);
3637 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3638 * @qc: Command on going
3640 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3643 * Inherited from caller.
3646 static void ata_pio_sector(struct ata_queued_cmd *qc)
3648 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3649 struct scatterlist *sg = qc->__sg;
3650 struct ata_port *ap = qc->ap;
3652 unsigned int offset;
3655 if (qc->cursect == (qc->nsect - 1))
3656 ap->hsm_task_state = HSM_ST_LAST;
3658 page = sg[qc->cursg].page;
3659 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3661 /* get the current page and offset */
3662 page = nth_page(page, (offset >> PAGE_SHIFT));
3663 offset %= PAGE_SIZE;
3665 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3667 if (PageHighMem(page)) {
3668 unsigned long flags;
3670 local_irq_save(flags);
3671 buf = kmap_atomic(page, KM_IRQ0);
3673 /* do the actual data transfer */
3674 ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
3676 kunmap_atomic(buf, KM_IRQ0);
3677 local_irq_restore(flags);
3679 buf = page_address(page);
3680 ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
3686 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3693 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3694 * @qc: Command on going
3696 * Transfer one or many ATA_SECT_SIZE of data from/to the
3697 * ATA device for the DRQ request.
3700 * Inherited from caller.
3703 static void ata_pio_sectors(struct ata_queued_cmd *qc)
3705 if (is_multi_taskfile(&qc->tf)) {
3706 /* READ/WRITE MULTIPLE */
3709 WARN_ON(qc->dev->multi_count == 0);
3711 nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
3719 * atapi_send_cdb - Write CDB bytes to hardware
3720 * @ap: Port to which ATAPI device is attached.
3721 * @qc: Taskfile currently active
3723 * When device has indicated its readiness to accept
3724 * a CDB, this function is called. Send the CDB.
3730 static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
3733 DPRINTK("send cdb\n");
3734 WARN_ON(qc->dev->cdb_len < 12);
3736 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3737 ata_altstatus(ap); /* flush */
3739 switch (qc->tf.protocol) {
3740 case ATA_PROT_ATAPI:
3741 ap->hsm_task_state = HSM_ST;
3743 case ATA_PROT_ATAPI_NODATA:
3744 ap->hsm_task_state = HSM_ST_LAST;
3746 case ATA_PROT_ATAPI_DMA:
3747 ap->hsm_task_state = HSM_ST_LAST;
3748 /* initiate bmdma */
3749 ap->ops->bmdma_start(qc);
3755 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3756 * @qc: Command on going
3757 * @bytes: number of bytes
3759 * Transfer Transfer data from/to the ATAPI device.
3762 * Inherited from caller.
3766 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3768 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3769 struct scatterlist *sg = qc->__sg;
3770 struct ata_port *ap = qc->ap;
3773 unsigned int offset, count;
3775 if (qc->curbytes + bytes >= qc->nbytes)
3776 ap->hsm_task_state = HSM_ST_LAST;
3779 if (unlikely(qc->cursg >= qc->n_elem)) {
3781 * The end of qc->sg is reached and the device expects
3782 * more data to transfer. In order not to overrun qc->sg
3783 * and fulfill length specified in the byte count register,
3784 * - for read case, discard trailing data from the device
3785 * - for write case, padding zero data to the device
3787 u16 pad_buf[1] = { 0 };
3788 unsigned int words = bytes >> 1;
3791 if (words) /* warning if bytes > 1 */
3792 ata_dev_printk(qc->dev, KERN_WARNING,
3793 "%u bytes trailing data\n", bytes);
3795 for (i = 0; i < words; i++)
3796 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3798 ap->hsm_task_state = HSM_ST_LAST;
3802 sg = &qc->__sg[qc->cursg];
3805 offset = sg->offset + qc->cursg_ofs;
3807 /* get the current page and offset */
3808 page = nth_page(page, (offset >> PAGE_SHIFT));
3809 offset %= PAGE_SIZE;
3811 /* don't overrun current sg */
3812 count = min(sg->length - qc->cursg_ofs, bytes);
3814 /* don't cross page boundaries */
3815 count = min(count, (unsigned int)PAGE_SIZE - offset);
3817 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3819 if (PageHighMem(page)) {
3820 unsigned long flags;
3822 local_irq_save(flags);
3823 buf = kmap_atomic(page, KM_IRQ0);
3825 /* do the actual data transfer */
3826 ata_data_xfer(ap, buf + offset, count, do_write);
3828 kunmap_atomic(buf, KM_IRQ0);
3829 local_irq_restore(flags);
3831 buf = page_address(page);
3832 ata_data_xfer(ap, buf + offset, count, do_write);
3836 qc->curbytes += count;
3837 qc->cursg_ofs += count;
3839 if (qc->cursg_ofs == sg->length) {
3849 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3850 * @qc: Command on going
3852 * Transfer Transfer data from/to the ATAPI device.
3855 * Inherited from caller.
3858 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3860 struct ata_port *ap = qc->ap;
3861 struct ata_device *dev = qc->dev;
3862 unsigned int ireason, bc_lo, bc_hi, bytes;
3863 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3865 ap->ops->tf_read(ap, &qc->tf);
3866 ireason = qc->tf.nsect;
3867 bc_lo = qc->tf.lbam;
3868 bc_hi = qc->tf.lbah;
3869 bytes = (bc_hi << 8) | bc_lo;
3871 /* shall be cleared to zero, indicating xfer of data */
3872 if (ireason & (1 << 0))
3875 /* make sure transfer direction matches expected */
3876 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3877 if (do_write != i_write)
3880 VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);
3882 __atapi_pio_bytes(qc, bytes);
3887 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
3888 qc->err_mask |= AC_ERR_HSM;
3889 ap->hsm_task_state = HSM_ST_ERR;
3893 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3894 * @ap: the target ata_port
3898 * 1 if ok in workqueue, 0 otherwise.
3901 static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
3903 if (qc->tf.flags & ATA_TFLAG_POLLING)
3906 if (ap->hsm_task_state == HSM_ST_FIRST) {
3907 if (qc->tf.protocol == ATA_PROT_PIO &&
3908 (qc->tf.flags & ATA_TFLAG_WRITE))
3911 if (is_atapi_taskfile(&qc->tf) &&
3912 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
3920 * ata_hsm_qc_complete - finish a qc running on standard HSM
3921 * @qc: Command to complete
3922 * @in_wq: 1 if called from workqueue, 0 otherwise
3924 * Finish @qc which is running on standard HSM.
3927 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
3928 * Otherwise, none on entry and grabs host lock.
3930 static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
3932 struct ata_port *ap = qc->ap;
3933 unsigned long flags;
3935 if (ap->ops->error_handler) {
3937 spin_lock_irqsave(&ap->host_set->lock, flags);
3939 /* EH might have kicked in while host_set lock
3942 qc = ata_qc_from_tag(ap, qc->tag);
3944 if (likely(!(qc->err_mask & AC_ERR_HSM))) {
3946 ata_qc_complete(qc);
3948 ata_port_freeze(ap);
3951 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3953 if (likely(!(qc->err_mask & AC_ERR_HSM)))
3954 ata_qc_complete(qc);
3956 ata_port_freeze(ap);
3960 spin_lock_irqsave(&ap->host_set->lock, flags);
3962 ata_qc_complete(qc);
3963 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3965 ata_qc_complete(qc);
3970 * ata_hsm_move - move the HSM to the next state.
3971 * @ap: the target ata_port
3973 * @status: current device status
3974 * @in_wq: 1 if called from workqueue, 0 otherwise
3977 * 1 when poll next status needed, 0 otherwise.
3980 static int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
3981 u8 status, int in_wq)
3983 unsigned long flags = 0;
3986 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
3988 /* Make sure ata_qc_issue_prot() does not throw things
3989 * like DMA polling into the workqueue. Notice that
3990 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
3992 WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
3995 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
3996 ap->id, qc->tf.protocol, ap->hsm_task_state, status);
3998 switch (ap->hsm_task_state) {
4000 /* Send first data block or PACKET CDB */
4002 /* If polling, we will stay in the work queue after
4003 * sending the data. Otherwise, interrupt handler
4004 * takes over after sending the data.
4006 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
4008 /* check device status */
4009 if (unlikely((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ)) {
4010 /* Wrong status. Let EH handle this */
4011 qc->err_mask |= AC_ERR_HSM;
4012 ap->hsm_task_state = HSM_ST_ERR;
4016 /* Device should not ask for data transfer (DRQ=1)
4017 * when it finds something wrong.
4018 * We ignore DRQ here and stop the HSM by
4019 * changing hsm_task_state to HSM_ST_ERR and
4020 * let the EH abort the command or reset the device.
4022 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4023 printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4025 qc->err_mask |= AC_ERR_DEV;
4026 ap->hsm_task_state = HSM_ST_ERR;
4030 /* Send the CDB (atapi) or the first data block (ata pio out).
4031 * During the state transition, interrupt handler shouldn't
4032 * be invoked before the data transfer is complete and
4033 * hsm_task_state is changed. Hence, the following locking.
4036 spin_lock_irqsave(&ap->host_set->lock, flags);
4038 if (qc->tf.protocol == ATA_PROT_PIO) {
4039 /* PIO data out protocol.
4040 * send first data block.
4043 /* ata_pio_sectors() might change the state
4044 * to HSM_ST_LAST. so, the state is changed here
4045 * before ata_pio_sectors().
4047 ap->hsm_task_state = HSM_ST;
4048 ata_pio_sectors(qc);
4049 ata_altstatus(ap); /* flush */
4052 atapi_send_cdb(ap, qc);
4055 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4057 /* if polling, ata_pio_task() handles the rest.
4058 * otherwise, interrupt handler takes over from here.
4063 /* complete command or read/write the data register */
4064 if (qc->tf.protocol == ATA_PROT_ATAPI) {
4065 /* ATAPI PIO protocol */
4066 if ((status & ATA_DRQ) == 0) {
4067 /* no more data to transfer */
4068 ap->hsm_task_state = HSM_ST_LAST;
4072 /* Device should not ask for data transfer (DRQ=1)
4073 * when it finds something wrong.
4074 * We ignore DRQ here and stop the HSM by
4075 * changing hsm_task_state to HSM_ST_ERR and
4076 * let the EH abort the command or reset the device.
4078 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4079 printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4081 qc->err_mask |= AC_ERR_DEV;
4082 ap->hsm_task_state = HSM_ST_ERR;
4086 atapi_pio_bytes(qc);
4088 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
4089 /* bad ireason reported by device */
4093 /* ATA PIO protocol */
4094 if (unlikely((status & ATA_DRQ) == 0)) {
4095 /* handle BSY=0, DRQ=0 as error */
4096 qc->err_mask |= AC_ERR_HSM;
4097 ap->hsm_task_state = HSM_ST_ERR;
4101 /* For PIO reads, some devices may ask for
4102 * data transfer (DRQ=1) alone with ERR=1.
4103 * We respect DRQ here and transfer one
4104 * block of junk data before changing the
4105 * hsm_task_state to HSM_ST_ERR.
4107 * For PIO writes, ERR=1 DRQ=1 doesn't make
4108 * sense since the data block has been
4109 * transferred to the device.
4111 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4112 /* data might be corrputed */
4113 qc->err_mask |= AC_ERR_DEV;
4115 if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
4116 ata_pio_sectors(qc);
4118 status = ata_wait_idle(ap);
4121 /* ata_pio_sectors() might change the
4122 * state to HSM_ST_LAST. so, the state
4123 * is changed after ata_pio_sectors().
4125 ap->hsm_task_state = HSM_ST_ERR;
4129 ata_pio_sectors(qc);
4131 if (ap->hsm_task_state == HSM_ST_LAST &&
4132 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
4135 status = ata_wait_idle(ap);
4140 ata_altstatus(ap); /* flush */
4145 if (unlikely(!ata_ok(status))) {
4146 qc->err_mask |= __ac_err_mask(status);
4147 ap->hsm_task_state = HSM_ST_ERR;
4151 /* no more data to transfer */
4152 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4153 ap->id, qc->dev->devno, status);
4155 WARN_ON(qc->err_mask);
4157 ap->hsm_task_state = HSM_ST_IDLE;
4159 /* complete taskfile transaction */
4160 ata_hsm_qc_complete(qc, in_wq);
4166 /* make sure qc->err_mask is available to
4167 * know what's wrong and recover
4169 WARN_ON(qc->err_mask == 0);
4171 ap->hsm_task_state = HSM_ST_IDLE;
4173 /* complete taskfile transaction */
4174 ata_hsm_qc_complete(qc, in_wq);
4186 static void ata_pio_task(void *_data)
4188 struct ata_queued_cmd *qc = _data;
4189 struct ata_port *ap = qc->ap;
4194 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4197 * This is purely heuristic. This is a fast path.
4198 * Sometimes when we enter, BSY will be cleared in
4199 * a chk-status or two. If not, the drive is probably seeking
4200 * or something. Snooze for a couple msecs, then
4201 * chk-status again. If still busy, queue delayed work.
4203 status = ata_busy_wait(ap, ATA_BUSY, 5);
4204 if (status & ATA_BUSY) {
4206 status = ata_busy_wait(ap, ATA_BUSY, 10);
4207 if (status & ATA_BUSY) {
4208 ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4214 poll_next = ata_hsm_move(ap, qc, status, 1);
4216 /* another command or interrupt handler
4217 * may be running at this point.
4224 * ata_qc_new - Request an available ATA command, for queueing
4225 * @ap: Port associated with device @dev
4226 * @dev: Device from whom we request an available command structure
4232 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4234 struct ata_queued_cmd *qc = NULL;
4237 /* no command while frozen */
4238 if (unlikely(ap->flags & ATA_FLAG_FROZEN))
4241 /* the last tag is reserved for internal command. */
4242 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4243 if (!test_and_set_bit(i, &ap->qc_allocated)) {
4244 qc = __ata_qc_from_tag(ap, i);
4255 * ata_qc_new_init - Request an available ATA command, and initialize it
4256 * @dev: Device from whom we request an available command structure
4262 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
4264 struct ata_port *ap = dev->ap;
4265 struct ata_queued_cmd *qc;
4267 qc = ata_qc_new(ap);
4280 * ata_qc_free - free unused ata_queued_cmd
4281 * @qc: Command to complete
4283 * Designed to free unused ata_queued_cmd object
4284 * in case something prevents using it.
4287 * spin_lock_irqsave(host_set lock)
4289 void ata_qc_free(struct ata_queued_cmd *qc)
4291 struct ata_port *ap = qc->ap;
4294 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4298 if (likely(ata_tag_valid(tag))) {
4299 qc->tag = ATA_TAG_POISON;
4300 clear_bit(tag, &ap->qc_allocated);
4304 void __ata_qc_complete(struct ata_queued_cmd *qc)
4306 struct ata_port *ap = qc->ap;
4308 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4309 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4311 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4314 /* command should be marked inactive atomically with qc completion */
4315 if (qc->tf.protocol == ATA_PROT_NCQ)
4316 ap->sactive &= ~(1 << qc->tag);
4318 ap->active_tag = ATA_TAG_POISON;
4320 /* atapi: mark qc as inactive to prevent the interrupt handler
4321 * from completing the command twice later, before the error handler
4322 * is called. (when rc != 0 and atapi request sense is needed)
4324 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4325 ap->qc_active &= ~(1 << qc->tag);
4327 /* call completion callback */
4328 qc->complete_fn(qc);
4332 * ata_qc_complete - Complete an active ATA command
4333 * @qc: Command to complete
4334 * @err_mask: ATA Status register contents
4336 * Indicate to the mid and upper layers that an ATA
4337 * command has completed, with either an ok or not-ok status.
4340 * spin_lock_irqsave(host_set lock)
4342 void ata_qc_complete(struct ata_queued_cmd *qc)
4344 struct ata_port *ap = qc->ap;
4346 /* XXX: New EH and old EH use different mechanisms to
4347 * synchronize EH with regular execution path.
4349 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4350 * Normal execution path is responsible for not accessing a
4351 * failed qc. libata core enforces the rule by returning NULL
4352 * from ata_qc_from_tag() for failed qcs.
4354 * Old EH depends on ata_qc_complete() nullifying completion
4355 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4356 * not synchronize with interrupt handler. Only PIO task is
4359 if (ap->ops->error_handler) {
4360 WARN_ON(ap->flags & ATA_FLAG_FROZEN);
4362 if (unlikely(qc->err_mask))
4363 qc->flags |= ATA_QCFLAG_FAILED;
4365 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4366 if (!ata_tag_internal(qc->tag)) {
4367 /* always fill result TF for failed qc */
4368 ap->ops->tf_read(ap, &qc->result_tf);
4369 ata_qc_schedule_eh(qc);
4374 /* read result TF if requested */
4375 if (qc->flags & ATA_QCFLAG_RESULT_TF)
4376 ap->ops->tf_read(ap, &qc->result_tf);
4378 __ata_qc_complete(qc);
4380 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4383 /* read result TF if failed or requested */
4384 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4385 ap->ops->tf_read(ap, &qc->result_tf);
4387 __ata_qc_complete(qc);
4392 * ata_qc_complete_multiple - Complete multiple qcs successfully
4393 * @ap: port in question
4394 * @qc_active: new qc_active mask
4395 * @finish_qc: LLDD callback invoked before completing a qc
4397 * Complete in-flight commands. This functions is meant to be
4398 * called from low-level driver's interrupt routine to complete
4399 * requests normally. ap->qc_active and @qc_active is compared
4400 * and commands are completed accordingly.
4403 * spin_lock_irqsave(host_set lock)
4406 * Number of completed commands on success, -errno otherwise.
4408 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
4409 void (*finish_qc)(struct ata_queued_cmd *))
4415 done_mask = ap->qc_active ^ qc_active;
4417 if (unlikely(done_mask & qc_active)) {
4418 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
4419 "(%08x->%08x)\n", ap->qc_active, qc_active);
4423 for (i = 0; i < ATA_MAX_QUEUE; i++) {
4424 struct ata_queued_cmd *qc;
4426 if (!(done_mask & (1 << i)))
4429 if ((qc = ata_qc_from_tag(ap, i))) {
4432 ata_qc_complete(qc);
4440 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4442 struct ata_port *ap = qc->ap;
4444 switch (qc->tf.protocol) {
4447 case ATA_PROT_ATAPI_DMA:
4450 case ATA_PROT_ATAPI:
4452 if (ap->flags & ATA_FLAG_PIO_DMA)
4465 * ata_qc_issue - issue taskfile to device
4466 * @qc: command to issue to device
4468 * Prepare an ATA command to submission to device.
4469 * This includes mapping the data into a DMA-able
4470 * area, filling in the S/G table, and finally
4471 * writing the taskfile to hardware, starting the command.
4474 * spin_lock_irqsave(host_set lock)
4476 void ata_qc_issue(struct ata_queued_cmd *qc)
4478 struct ata_port *ap = qc->ap;
4480 /* Make sure only one non-NCQ command is outstanding. The
4481 * check is skipped for old EH because it reuses active qc to
4482 * request ATAPI sense.
4484 WARN_ON(ap->ops->error_handler && ata_tag_valid(ap->active_tag));
4486 if (qc->tf.protocol == ATA_PROT_NCQ) {
4487 WARN_ON(ap->sactive & (1 << qc->tag));
4488 ap->sactive |= 1 << qc->tag;
4490 WARN_ON(ap->sactive);
4491 ap->active_tag = qc->tag;
4494 qc->flags |= ATA_QCFLAG_ACTIVE;
4495 ap->qc_active |= 1 << qc->tag;
4497 if (ata_should_dma_map(qc)) {
4498 if (qc->flags & ATA_QCFLAG_SG) {
4499 if (ata_sg_setup(qc))
4501 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4502 if (ata_sg_setup_one(qc))
4506 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4509 ap->ops->qc_prep(qc);
4511 qc->err_mask |= ap->ops->qc_issue(qc);
4512 if (unlikely(qc->err_mask))
4517 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4518 qc->err_mask |= AC_ERR_SYSTEM;
4520 ata_qc_complete(qc);
4524 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4525 * @qc: command to issue to device
4527 * Using various libata functions and hooks, this function
4528 * starts an ATA command. ATA commands are grouped into
4529 * classes called "protocols", and issuing each type of protocol
4530 * is slightly different.
4532 * May be used as the qc_issue() entry in ata_port_operations.
4535 * spin_lock_irqsave(host_set lock)
4538 * Zero on success, AC_ERR_* mask on failure
4541 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4543 struct ata_port *ap = qc->ap;
4545 /* Use polling pio if the LLD doesn't handle
4546 * interrupt driven pio and atapi CDB interrupt.
4548 if (ap->flags & ATA_FLAG_PIO_POLLING) {
4549 switch (qc->tf.protocol) {
4551 case ATA_PROT_ATAPI:
4552 case ATA_PROT_ATAPI_NODATA:
4553 qc->tf.flags |= ATA_TFLAG_POLLING;
4555 case ATA_PROT_ATAPI_DMA:
4556 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
4557 /* see ata_check_atapi_dma() */
4565 /* select the device */
4566 ata_dev_select(ap, qc->dev->devno, 1, 0);
4568 /* start the command */
4569 switch (qc->tf.protocol) {
4570 case ATA_PROT_NODATA:
4571 if (qc->tf.flags & ATA_TFLAG_POLLING)
4572 ata_qc_set_polling(qc);
4574 ata_tf_to_host(ap, &qc->tf);
4575 ap->hsm_task_state = HSM_ST_LAST;
4577 if (qc->tf.flags & ATA_TFLAG_POLLING)
4578 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4583 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4585 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4586 ap->ops->bmdma_setup(qc); /* set up bmdma */
4587 ap->ops->bmdma_start(qc); /* initiate bmdma */
4588 ap->hsm_task_state = HSM_ST_LAST;
4592 if (qc->tf.flags & ATA_TFLAG_POLLING)
4593 ata_qc_set_polling(qc);
4595 ata_tf_to_host(ap, &qc->tf);
4597 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4598 /* PIO data out protocol */
4599 ap->hsm_task_state = HSM_ST_FIRST;
4600 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4602 /* always send first data block using
4603 * the ata_pio_task() codepath.
4606 /* PIO data in protocol */
4607 ap->hsm_task_state = HSM_ST;
4609 if (qc->tf.flags & ATA_TFLAG_POLLING)
4610 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4612 /* if polling, ata_pio_task() handles the rest.
4613 * otherwise, interrupt handler takes over from here.
4619 case ATA_PROT_ATAPI:
4620 case ATA_PROT_ATAPI_NODATA:
4621 if (qc->tf.flags & ATA_TFLAG_POLLING)
4622 ata_qc_set_polling(qc);
4624 ata_tf_to_host(ap, &qc->tf);
4626 ap->hsm_task_state = HSM_ST_FIRST;
4628 /* send cdb by polling if no cdb interrupt */
4629 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
4630 (qc->tf.flags & ATA_TFLAG_POLLING))
4631 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4634 case ATA_PROT_ATAPI_DMA:
4635 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4637 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4638 ap->ops->bmdma_setup(qc); /* set up bmdma */
4639 ap->hsm_task_state = HSM_ST_FIRST;
4641 /* send cdb by polling if no cdb interrupt */
4642 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4643 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4648 return AC_ERR_SYSTEM;
4655 * ata_host_intr - Handle host interrupt for given (port, task)
4656 * @ap: Port on which interrupt arrived (possibly...)
4657 * @qc: Taskfile currently active in engine
4659 * Handle host interrupt for given queued command. Currently,
4660 * only DMA interrupts are handled. All other commands are
4661 * handled via polling with interrupts disabled (nIEN bit).
4664 * spin_lock_irqsave(host_set lock)
4667 * One if interrupt was handled, zero if not (shared irq).
4670 inline unsigned int ata_host_intr (struct ata_port *ap,
4671 struct ata_queued_cmd *qc)
4673 u8 status, host_stat = 0;
4675 VPRINTK("ata%u: protocol %d task_state %d\n",
4676 ap->id, qc->tf.protocol, ap->hsm_task_state);
4678 /* Check whether we are expecting interrupt in this state */
4679 switch (ap->hsm_task_state) {
4681 /* Some pre-ATAPI-4 devices assert INTRQ
4682 * at this state when ready to receive CDB.
4685 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4686 * The flag was turned on only for atapi devices.
4687 * No need to check is_atapi_taskfile(&qc->tf) again.
4689 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4693 if (qc->tf.protocol == ATA_PROT_DMA ||
4694 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
4695 /* check status of DMA engine */
4696 host_stat = ap->ops->bmdma_status(ap);
4697 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4699 /* if it's not our irq... */
4700 if (!(host_stat & ATA_DMA_INTR))
4703 /* before we do anything else, clear DMA-Start bit */
4704 ap->ops->bmdma_stop(qc);
4706 if (unlikely(host_stat & ATA_DMA_ERR)) {
4707 /* error when transfering data to/from memory */
4708 qc->err_mask |= AC_ERR_HOST_BUS;
4709 ap->hsm_task_state = HSM_ST_ERR;
4719 /* check altstatus */
4720 status = ata_altstatus(ap);
4721 if (status & ATA_BUSY)
4724 /* check main status, clearing INTRQ */
4725 status = ata_chk_status(ap);
4726 if (unlikely(status & ATA_BUSY))
4729 /* ack bmdma irq events */
4730 ap->ops->irq_clear(ap);
4732 ata_hsm_move(ap, qc, status, 0);
4733 return 1; /* irq handled */
4736 ap->stats.idle_irq++;
4739 if ((ap->stats.idle_irq % 1000) == 0) {
4740 ata_irq_ack(ap, 0); /* debug trap */
4741 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
4745 return 0; /* irq not handled */
4749 * ata_interrupt - Default ATA host interrupt handler
4750 * @irq: irq line (unused)
4751 * @dev_instance: pointer to our ata_host_set information structure
4754 * Default interrupt handler for PCI IDE devices. Calls
4755 * ata_host_intr() for each port that is not disabled.
4758 * Obtains host_set lock during operation.
4761 * IRQ_NONE or IRQ_HANDLED.
4764 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4766 struct ata_host_set *host_set = dev_instance;
4768 unsigned int handled = 0;
4769 unsigned long flags;
4771 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4772 spin_lock_irqsave(&host_set->lock, flags);
4774 for (i = 0; i < host_set->n_ports; i++) {
4775 struct ata_port *ap;
4777 ap = host_set->ports[i];
4779 !(ap->flags & ATA_FLAG_DISABLED)) {
4780 struct ata_queued_cmd *qc;
4782 qc = ata_qc_from_tag(ap, ap->active_tag);
4783 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
4784 (qc->flags & ATA_QCFLAG_ACTIVE))
4785 handled |= ata_host_intr(ap, qc);
4789 spin_unlock_irqrestore(&host_set->lock, flags);
4791 return IRQ_RETVAL(handled);
4795 * sata_scr_valid - test whether SCRs are accessible
4796 * @ap: ATA port to test SCR accessibility for
4798 * Test whether SCRs are accessible for @ap.
4804 * 1 if SCRs are accessible, 0 otherwise.
4806 int sata_scr_valid(struct ata_port *ap)
4808 return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
4812 * sata_scr_read - read SCR register of the specified port
4813 * @ap: ATA port to read SCR for
4815 * @val: Place to store read value
4817 * Read SCR register @reg of @ap into *@val. This function is
4818 * guaranteed to succeed if the cable type of the port is SATA
4819 * and the port implements ->scr_read.
4825 * 0 on success, negative errno on failure.
4827 int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
4829 if (sata_scr_valid(ap)) {
4830 *val = ap->ops->scr_read(ap, reg);
4837 * sata_scr_write - write SCR register of the specified port
4838 * @ap: ATA port to write SCR for
4839 * @reg: SCR to write
4840 * @val: value to write
4842 * Write @val to SCR register @reg of @ap. This function is
4843 * guaranteed to succeed if the cable type of the port is SATA
4844 * and the port implements ->scr_read.
4850 * 0 on success, negative errno on failure.
4852 int sata_scr_write(struct ata_port *ap, int reg, u32 val)
4854 if (sata_scr_valid(ap)) {
4855 ap->ops->scr_write(ap, reg, val);
4862 * sata_scr_write_flush - write SCR register of the specified port and flush
4863 * @ap: ATA port to write SCR for
4864 * @reg: SCR to write
4865 * @val: value to write
4867 * This function is identical to sata_scr_write() except that this
4868 * function performs flush after writing to the register.
4874 * 0 on success, negative errno on failure.
4876 int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
4878 if (sata_scr_valid(ap)) {
4879 ap->ops->scr_write(ap, reg, val);
4880 ap->ops->scr_read(ap, reg);
4887 * ata_port_online - test whether the given port is online
4888 * @ap: ATA port to test
4890 * Test whether @ap is online. Note that this function returns 0
4891 * if online status of @ap cannot be obtained, so
4892 * ata_port_online(ap) != !ata_port_offline(ap).
4898 * 1 if the port online status is available and online.
4900 int ata_port_online(struct ata_port *ap)
4904 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
4910 * ata_port_offline - test whether the given port is offline
4911 * @ap: ATA port to test
4913 * Test whether @ap is offline. Note that this function returns
4914 * 0 if offline status of @ap cannot be obtained, so
4915 * ata_port_online(ap) != !ata_port_offline(ap).
4921 * 1 if the port offline status is available and offline.
4923 int ata_port_offline(struct ata_port *ap)
4927 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
4933 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4934 * without filling any other registers
4936 static int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
4938 struct ata_taskfile tf;
4941 ata_tf_init(dev, &tf);
4944 tf.flags |= ATA_TFLAG_DEVICE;
4945 tf.protocol = ATA_PROT_NODATA;
4947 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4949 ata_dev_printk(dev, KERN_ERR, "%s: ata command failed: %d\n",
4955 static int ata_flush_cache(struct ata_device *dev)
4959 if (!ata_try_flush_cache(dev))
4962 if (ata_id_has_flush_ext(dev->id))
4963 cmd = ATA_CMD_FLUSH_EXT;
4965 cmd = ATA_CMD_FLUSH;
4967 return ata_do_simple_cmd(dev, cmd);
4970 static int ata_standby_drive(struct ata_device *dev)
4972 return ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1);
4975 static int ata_start_drive(struct ata_device *dev)
4977 return ata_do_simple_cmd(dev, ATA_CMD_IDLEIMMEDIATE);
4981 * ata_device_resume - wakeup a previously suspended devices
4982 * @dev: the device to resume
4984 * Kick the drive back into action, by sending it an idle immediate
4985 * command and making sure its transfer mode matches between drive
4989 int ata_device_resume(struct ata_device *dev)
4991 struct ata_port *ap = dev->ap;
4993 if (ap->flags & ATA_FLAG_SUSPENDED) {
4994 struct ata_device *failed_dev;
4995 ap->flags &= ~ATA_FLAG_SUSPENDED;
4996 while (ata_set_mode(ap, &failed_dev))
4997 ata_dev_disable(failed_dev);
4999 if (!ata_dev_enabled(dev))
5001 if (dev->class == ATA_DEV_ATA)
5002 ata_start_drive(dev);
5008 * ata_device_suspend - prepare a device for suspend
5009 * @dev: the device to suspend
5011 * Flush the cache on the drive, if appropriate, then issue a
5012 * standbynow command.
5014 int ata_device_suspend(struct ata_device *dev, pm_message_t state)
5016 struct ata_port *ap = dev->ap;
5018 if (!ata_dev_enabled(dev))
5020 if (dev->class == ATA_DEV_ATA)
5021 ata_flush_cache(dev);
5023 if (state.event != PM_EVENT_FREEZE)
5024 ata_standby_drive(dev);
5025 ap->flags |= ATA_FLAG_SUSPENDED;
5030 * ata_port_start - Set port up for dma.
5031 * @ap: Port to initialize
5033 * Called just after data structures for each port are
5034 * initialized. Allocates space for PRD table.
5036 * May be used as the port_start() entry in ata_port_operations.
5039 * Inherited from caller.
5042 int ata_port_start (struct ata_port *ap)
5044 struct device *dev = ap->dev;
5047 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
5051 rc = ata_pad_alloc(ap, dev);
5053 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
5057 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
5064 * ata_port_stop - Undo ata_port_start()
5065 * @ap: Port to shut down
5067 * Frees the PRD table.
5069 * May be used as the port_stop() entry in ata_port_operations.
5072 * Inherited from caller.
5075 void ata_port_stop (struct ata_port *ap)
5077 struct device *dev = ap->dev;
5079 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
5080 ata_pad_free(ap, dev);
5083 void ata_host_stop (struct ata_host_set *host_set)
5085 if (host_set->mmio_base)
5086 iounmap(host_set->mmio_base);
5091 * ata_host_remove - Unregister SCSI host structure with upper layers
5092 * @ap: Port to unregister
5093 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
5096 * Inherited from caller.
5099 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
5101 struct Scsi_Host *sh = ap->host;
5106 scsi_remove_host(sh);
5108 ap->ops->port_stop(ap);
5112 * ata_host_init - Initialize an ata_port structure
5113 * @ap: Structure to initialize
5114 * @host: associated SCSI mid-layer structure
5115 * @host_set: Collection of hosts to which @ap belongs
5116 * @ent: Probe information provided by low-level driver
5117 * @port_no: Port number associated with this ata_port
5119 * Initialize a new ata_port structure, and its associated
5123 * Inherited from caller.
5126 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
5127 struct ata_host_set *host_set,
5128 const struct ata_probe_ent *ent, unsigned int port_no)
5134 host->max_channel = 1;
5135 host->unique_id = ata_unique_id++;
5136 host->max_cmd_len = 12;
5138 ap->flags = ATA_FLAG_DISABLED;
5139 ap->id = host->unique_id;
5141 ap->ctl = ATA_DEVCTL_OBS;
5142 ap->host_set = host_set;
5144 ap->port_no = port_no;
5146 ent->legacy_mode ? ent->hard_port_no : port_no;
5147 ap->pio_mask = ent->pio_mask;
5148 ap->mwdma_mask = ent->mwdma_mask;
5149 ap->udma_mask = ent->udma_mask;
5150 ap->flags |= ent->host_flags;
5151 ap->ops = ent->port_ops;
5152 ap->sata_spd_limit = UINT_MAX;
5153 ap->active_tag = ATA_TAG_POISON;
5154 ap->last_ctl = 0xFF;
5156 INIT_WORK(&ap->port_task, NULL, NULL);
5157 INIT_LIST_HEAD(&ap->eh_done_q);
5159 /* set cable type */
5160 ap->cbl = ATA_CBL_NONE;
5161 if (ap->flags & ATA_FLAG_SATA)
5162 ap->cbl = ATA_CBL_SATA;
5164 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5165 struct ata_device *dev = &ap->device[i];
5168 dev->pio_mask = UINT_MAX;
5169 dev->mwdma_mask = UINT_MAX;
5170 dev->udma_mask = UINT_MAX;
5174 ap->stats.unhandled_irq = 1;
5175 ap->stats.idle_irq = 1;
5178 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
5182 * ata_host_add - Attach low-level ATA driver to system
5183 * @ent: Information provided by low-level driver
5184 * @host_set: Collections of ports to which we add
5185 * @port_no: Port number associated with this host
5187 * Attach low-level ATA driver to system.
5190 * PCI/etc. bus probe sem.
5193 * New ata_port on success, for NULL on error.
5196 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
5197 struct ata_host_set *host_set,
5198 unsigned int port_no)
5200 struct Scsi_Host *host;
5201 struct ata_port *ap;
5206 if (!ent->port_ops->probe_reset &&
5207 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
5208 printk(KERN_ERR "ata%u: no reset mechanism available\n",
5213 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
5217 host->transportt = &ata_scsi_transport_template;
5219 ap = ata_shost_to_port(host);
5221 ata_host_init(ap, host, host_set, ent, port_no);
5223 rc = ap->ops->port_start(ap);
5230 scsi_host_put(host);
5235 * ata_device_add - Register hardware device with ATA and SCSI layers
5236 * @ent: Probe information describing hardware device to be registered
5238 * This function processes the information provided in the probe
5239 * information struct @ent, allocates the necessary ATA and SCSI
5240 * host information structures, initializes them, and registers
5241 * everything with requisite kernel subsystems.
5243 * This function requests irqs, probes the ATA bus, and probes
5247 * PCI/etc. bus probe sem.
5250 * Number of ports registered. Zero on error (no ports registered).
5253 int ata_device_add(const struct ata_probe_ent *ent)
5255 unsigned int count = 0, i;
5256 struct device *dev = ent->dev;
5257 struct ata_host_set *host_set;
5260 /* alloc a container for our list of ATA ports (buses) */
5261 host_set = kzalloc(sizeof(struct ata_host_set) +
5262 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
5265 spin_lock_init(&host_set->lock);
5267 host_set->dev = dev;
5268 host_set->n_ports = ent->n_ports;
5269 host_set->irq = ent->irq;
5270 host_set->mmio_base = ent->mmio_base;
5271 host_set->private_data = ent->private_data;
5272 host_set->ops = ent->port_ops;
5273 host_set->flags = ent->host_set_flags;
5275 /* register each port bound to this device */
5276 for (i = 0; i < ent->n_ports; i++) {
5277 struct ata_port *ap;
5278 unsigned long xfer_mode_mask;
5280 ap = ata_host_add(ent, host_set, i);
5284 host_set->ports[i] = ap;
5285 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
5286 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
5287 (ap->pio_mask << ATA_SHIFT_PIO);
5289 /* print per-port info to dmesg */
5290 ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%lX "
5291 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
5292 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
5293 ata_mode_string(xfer_mode_mask),
5294 ap->ioaddr.cmd_addr,
5295 ap->ioaddr.ctl_addr,
5296 ap->ioaddr.bmdma_addr,
5300 host_set->ops->irq_clear(ap);
5301 ata_eh_freeze_port(ap); /* freeze port before requesting IRQ */
5308 /* obtain irq, that is shared between channels */
5309 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
5310 DRV_NAME, host_set))
5313 /* perform each probe synchronously */
5314 DPRINTK("probe begin\n");
5315 for (i = 0; i < count; i++) {
5316 struct ata_port *ap;
5319 ap = host_set->ports[i];
5321 DPRINTK("ata%u: bus probe begin\n", ap->id);
5322 rc = ata_bus_probe(ap);
5323 DPRINTK("ata%u: bus probe end\n", ap->id);
5326 /* FIXME: do something useful here?
5327 * Current libata behavior will
5328 * tear down everything when
5329 * the module is removed
5330 * or the h/w is unplugged.
5334 rc = scsi_add_host(ap->host, dev);
5336 ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
5337 /* FIXME: do something useful here */
5338 /* FIXME: handle unconditional calls to
5339 * scsi_scan_host and ata_host_remove, below,
5345 /* probes are done, now scan each port's disk(s) */
5346 DPRINTK("host probe begin\n");
5347 for (i = 0; i < count; i++) {
5348 struct ata_port *ap = host_set->ports[i];
5350 ata_scsi_scan_host(ap);
5353 dev_set_drvdata(dev, host_set);
5355 VPRINTK("EXIT, returning %u\n", ent->n_ports);
5356 return ent->n_ports; /* success */
5359 for (i = 0; i < count; i++) {
5360 ata_host_remove(host_set->ports[i], 1);
5361 scsi_host_put(host_set->ports[i]->host);
5365 VPRINTK("EXIT, returning 0\n");
5370 * ata_host_set_remove - PCI layer callback for device removal
5371 * @host_set: ATA host set that was removed
5373 * Unregister all objects associated with this host set. Free those
5377 * Inherited from calling layer (may sleep).
5380 void ata_host_set_remove(struct ata_host_set *host_set)
5382 struct ata_port *ap;
5385 for (i = 0; i < host_set->n_ports; i++) {
5386 ap = host_set->ports[i];
5387 scsi_remove_host(ap->host);
5390 free_irq(host_set->irq, host_set);
5392 for (i = 0; i < host_set->n_ports; i++) {
5393 ap = host_set->ports[i];
5395 ata_scsi_release(ap->host);
5397 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
5398 struct ata_ioports *ioaddr = &ap->ioaddr;
5400 if (ioaddr->cmd_addr == 0x1f0)
5401 release_region(0x1f0, 8);
5402 else if (ioaddr->cmd_addr == 0x170)
5403 release_region(0x170, 8);
5406 scsi_host_put(ap->host);
5409 if (host_set->ops->host_stop)
5410 host_set->ops->host_stop(host_set);
5416 * ata_scsi_release - SCSI layer callback hook for host unload
5417 * @host: libata host to be unloaded
5419 * Performs all duties necessary to shut down a libata port...
5420 * Kill port kthread, disable port, and release resources.
5423 * Inherited from SCSI layer.
5429 int ata_scsi_release(struct Scsi_Host *host)
5431 struct ata_port *ap = ata_shost_to_port(host);
5435 ap->ops->port_disable(ap);
5436 ata_host_remove(ap, 0);
5443 * ata_std_ports - initialize ioaddr with standard port offsets.
5444 * @ioaddr: IO address structure to be initialized
5446 * Utility function which initializes data_addr, error_addr,
5447 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5448 * device_addr, status_addr, and command_addr to standard offsets
5449 * relative to cmd_addr.
5451 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5454 void ata_std_ports(struct ata_ioports *ioaddr)
5456 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
5457 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
5458 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
5459 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
5460 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
5461 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
5462 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
5463 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
5464 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
5465 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
5471 void ata_pci_host_stop (struct ata_host_set *host_set)
5473 struct pci_dev *pdev = to_pci_dev(host_set->dev);
5475 pci_iounmap(pdev, host_set->mmio_base);
5479 * ata_pci_remove_one - PCI layer callback for device removal
5480 * @pdev: PCI device that was removed
5482 * PCI layer indicates to libata via this hook that
5483 * hot-unplug or module unload event has occurred.
5484 * Handle this by unregistering all objects associated
5485 * with this PCI device. Free those objects. Then finally
5486 * release PCI resources and disable device.
5489 * Inherited from PCI layer (may sleep).
5492 void ata_pci_remove_one (struct pci_dev *pdev)
5494 struct device *dev = pci_dev_to_dev(pdev);
5495 struct ata_host_set *host_set = dev_get_drvdata(dev);
5497 ata_host_set_remove(host_set);
5498 pci_release_regions(pdev);
5499 pci_disable_device(pdev);
5500 dev_set_drvdata(dev, NULL);
5503 /* move to PCI subsystem */
5504 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
5506 unsigned long tmp = 0;
5508 switch (bits->width) {
5511 pci_read_config_byte(pdev, bits->reg, &tmp8);
5517 pci_read_config_word(pdev, bits->reg, &tmp16);
5523 pci_read_config_dword(pdev, bits->reg, &tmp32);
5534 return (tmp == bits->val) ? 1 : 0;
5537 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
5539 pci_save_state(pdev);
5540 pci_disable_device(pdev);
5541 pci_set_power_state(pdev, PCI_D3hot);
5545 int ata_pci_device_resume(struct pci_dev *pdev)
5547 pci_set_power_state(pdev, PCI_D0);
5548 pci_restore_state(pdev);
5549 pci_enable_device(pdev);
5550 pci_set_master(pdev);
5553 #endif /* CONFIG_PCI */
5556 static int __init ata_init(void)
5558 ata_wq = create_workqueue("ata");
5562 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5566 static void __exit ata_exit(void)
5568 destroy_workqueue(ata_wq);
5571 module_init(ata_init);
5572 module_exit(ata_exit);
5574 static unsigned long ratelimit_time;
5575 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5577 int ata_ratelimit(void)
5580 unsigned long flags;
5582 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5584 if (time_after(jiffies, ratelimit_time)) {
5586 ratelimit_time = jiffies + (HZ/5);
5590 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5596 * ata_wait_register - wait until register value changes
5597 * @reg: IO-mapped register
5598 * @mask: Mask to apply to read register value
5599 * @val: Wait condition
5600 * @interval_msec: polling interval in milliseconds
5601 * @timeout_msec: timeout in milliseconds
5603 * Waiting for some bits of register to change is a common
5604 * operation for ATA controllers. This function reads 32bit LE
5605 * IO-mapped register @reg and tests for the following condition.
5607 * (*@reg & mask) != val
5609 * If the condition is met, it returns; otherwise, the process is
5610 * repeated after @interval_msec until timeout.
5613 * Kernel thread context (may sleep)
5616 * The final register value.
5618 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
5619 unsigned long interval_msec,
5620 unsigned long timeout_msec)
5622 unsigned long timeout;
5625 tmp = ioread32(reg);
5627 /* Calculate timeout _after_ the first read to make sure
5628 * preceding writes reach the controller before starting to
5629 * eat away the timeout.
5631 timeout = jiffies + (timeout_msec * HZ) / 1000;
5633 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
5634 msleep(interval_msec);
5635 tmp = ioread32(reg);
5642 * libata is essentially a library of internal helper functions for
5643 * low-level ATA host controller drivers. As such, the API/ABI is
5644 * likely to change as new drivers are added and updated.
5645 * Do not depend on ABI/API stability.
5648 EXPORT_SYMBOL_GPL(ata_std_bios_param);
5649 EXPORT_SYMBOL_GPL(ata_std_ports);
5650 EXPORT_SYMBOL_GPL(ata_device_add);
5651 EXPORT_SYMBOL_GPL(ata_host_set_remove);
5652 EXPORT_SYMBOL_GPL(ata_sg_init);
5653 EXPORT_SYMBOL_GPL(ata_sg_init_one);
5654 EXPORT_SYMBOL_GPL(ata_qc_complete);
5655 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
5656 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
5657 EXPORT_SYMBOL_GPL(ata_tf_load);
5658 EXPORT_SYMBOL_GPL(ata_tf_read);
5659 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5660 EXPORT_SYMBOL_GPL(ata_std_dev_select);
5661 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5662 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5663 EXPORT_SYMBOL_GPL(ata_check_status);
5664 EXPORT_SYMBOL_GPL(ata_altstatus);
5665 EXPORT_SYMBOL_GPL(ata_exec_command);
5666 EXPORT_SYMBOL_GPL(ata_port_start);
5667 EXPORT_SYMBOL_GPL(ata_port_stop);
5668 EXPORT_SYMBOL_GPL(ata_host_stop);
5669 EXPORT_SYMBOL_GPL(ata_interrupt);
5670 EXPORT_SYMBOL_GPL(ata_qc_prep);
5671 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
5672 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5673 EXPORT_SYMBOL_GPL(ata_bmdma_start);
5674 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5675 EXPORT_SYMBOL_GPL(ata_bmdma_status);
5676 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5677 EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
5678 EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
5679 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
5680 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
5681 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
5682 EXPORT_SYMBOL_GPL(ata_port_probe);
5683 EXPORT_SYMBOL_GPL(sata_set_spd);
5684 EXPORT_SYMBOL_GPL(sata_phy_reset);
5685 EXPORT_SYMBOL_GPL(__sata_phy_reset);
5686 EXPORT_SYMBOL_GPL(ata_bus_reset);
5687 EXPORT_SYMBOL_GPL(ata_std_probeinit);
5688 EXPORT_SYMBOL_GPL(ata_std_softreset);
5689 EXPORT_SYMBOL_GPL(sata_std_hardreset);
5690 EXPORT_SYMBOL_GPL(ata_std_postreset);
5691 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5692 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5693 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
5694 EXPORT_SYMBOL_GPL(ata_dev_classify);
5695 EXPORT_SYMBOL_GPL(ata_dev_pair);
5696 EXPORT_SYMBOL_GPL(ata_port_disable);
5697 EXPORT_SYMBOL_GPL(ata_ratelimit);
5698 EXPORT_SYMBOL_GPL(ata_wait_register);
5699 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5700 EXPORT_SYMBOL_GPL(ata_port_queue_task);
5701 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5702 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5703 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5704 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
5705 EXPORT_SYMBOL_GPL(ata_scsi_release);
5706 EXPORT_SYMBOL_GPL(ata_host_intr);
5707 EXPORT_SYMBOL_GPL(sata_scr_valid);
5708 EXPORT_SYMBOL_GPL(sata_scr_read);
5709 EXPORT_SYMBOL_GPL(sata_scr_write);
5710 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
5711 EXPORT_SYMBOL_GPL(ata_port_online);
5712 EXPORT_SYMBOL_GPL(ata_port_offline);
5713 EXPORT_SYMBOL_GPL(ata_id_string);
5714 EXPORT_SYMBOL_GPL(ata_id_c_string);
5715 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5717 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5718 EXPORT_SYMBOL_GPL(ata_timing_compute);
5719 EXPORT_SYMBOL_GPL(ata_timing_merge);
5722 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5723 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5724 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5725 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5726 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5727 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5728 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5729 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
5730 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
5731 #endif /* CONFIG_PCI */
5733 EXPORT_SYMBOL_GPL(ata_device_suspend);
5734 EXPORT_SYMBOL_GPL(ata_device_resume);
5735 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5736 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
5738 EXPORT_SYMBOL_GPL(ata_eng_timeout);
5739 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
5740 EXPORT_SYMBOL_GPL(ata_port_abort);
5741 EXPORT_SYMBOL_GPL(ata_port_freeze);
5742 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
5743 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
5744 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5745 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
5746 EXPORT_SYMBOL_GPL(ata_do_eh);