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 DECLARE_COMPLETION(wait);
986 unsigned int err_mask;
989 spin_lock_irqsave(&ap->host_set->lock, flags);
991 /* no internal command while frozen */
992 if (ap->flags & ATA_FLAG_FROZEN) {
993 spin_unlock_irqrestore(&ap->host_set->lock, flags);
994 return AC_ERR_SYSTEM;
997 /* initialize internal qc */
999 /* XXX: Tag 0 is used for drivers with legacy EH as some
1000 * drivers choke if any other tag is given. This breaks
1001 * ata_tag_internal() test for those drivers. Don't use new
1002 * EH stuff without converting to it.
1004 if (ap->ops->error_handler)
1005 tag = ATA_TAG_INTERNAL;
1009 if (test_and_set_bit(tag, &ap->qactive))
1011 qc = __ata_qc_from_tag(ap, tag);
1019 preempted_tag = ap->active_tag;
1020 ap->active_tag = ATA_TAG_POISON;
1022 /* prepare & issue qc */
1025 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1026 qc->flags |= ATA_QCFLAG_RESULT_TF;
1027 qc->dma_dir = dma_dir;
1028 if (dma_dir != DMA_NONE) {
1029 ata_sg_init_one(qc, buf, buflen);
1030 qc->nsect = buflen / ATA_SECT_SIZE;
1033 qc->private_data = &wait;
1034 qc->complete_fn = ata_qc_complete_internal;
1038 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1040 rc = wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL);
1042 ata_port_flush_task(ap);
1045 spin_lock_irqsave(&ap->host_set->lock, flags);
1047 /* We're racing with irq here. If we lose, the
1048 * following test prevents us from completing the qc
1049 * twice. If we win, the port is frozen and will be
1050 * cleaned up by ->post_internal_cmd().
1052 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1053 qc->err_mask |= AC_ERR_TIMEOUT;
1055 if (ap->ops->error_handler)
1056 ata_port_freeze(ap);
1058 ata_qc_complete(qc);
1060 ata_dev_printk(dev, KERN_WARNING,
1061 "qc timeout (cmd 0x%x)\n", command);
1064 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1067 /* do post_internal_cmd */
1068 if (ap->ops->post_internal_cmd)
1069 ap->ops->post_internal_cmd(qc);
1071 if (qc->flags & ATA_QCFLAG_FAILED && !qc->err_mask) {
1072 ata_dev_printk(dev, KERN_WARNING, "zero err_mask for failed "
1073 "internal command, assuming AC_ERR_OTHER\n");
1074 qc->err_mask |= AC_ERR_OTHER;
1078 spin_lock_irqsave(&ap->host_set->lock, flags);
1080 *tf = qc->result_tf;
1081 err_mask = qc->err_mask;
1084 ap->active_tag = preempted_tag;
1086 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1087 * Until those drivers are fixed, we detect the condition
1088 * here, fail the command with AC_ERR_SYSTEM and reenable the
1091 * Note that this doesn't change any behavior as internal
1092 * command failure results in disabling the device in the
1093 * higher layer for LLDDs without new reset/EH callbacks.
1095 * Kill the following code as soon as those drivers are fixed.
1097 if (ap->flags & ATA_FLAG_DISABLED) {
1098 err_mask |= AC_ERR_SYSTEM;
1102 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1108 * ata_pio_need_iordy - check if iordy needed
1111 * Check if the current speed of the device requires IORDY. Used
1112 * by various controllers for chip configuration.
1115 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1118 int speed = adev->pio_mode - XFER_PIO_0;
1125 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1127 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1128 pio = adev->id[ATA_ID_EIDE_PIO];
1129 /* Is the speed faster than the drive allows non IORDY ? */
1131 /* This is cycle times not frequency - watch the logic! */
1132 if (pio > 240) /* PIO2 is 240nS per cycle */
1141 * ata_dev_read_id - Read ID data from the specified device
1142 * @dev: target device
1143 * @p_class: pointer to class of the target device (may be changed)
1144 * @post_reset: is this read ID post-reset?
1145 * @id: buffer to read IDENTIFY data into
1147 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1148 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1149 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1150 * for pre-ATA4 drives.
1153 * Kernel thread context (may sleep)
1156 * 0 on success, -errno otherwise.
1158 static int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1159 int post_reset, u16 *id)
1161 struct ata_port *ap = dev->ap;
1162 unsigned int class = *p_class;
1163 struct ata_taskfile tf;
1164 unsigned int err_mask = 0;
1168 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1170 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1173 ata_tf_init(dev, &tf);
1177 tf.command = ATA_CMD_ID_ATA;
1180 tf.command = ATA_CMD_ID_ATAPI;
1184 reason = "unsupported class";
1188 tf.protocol = ATA_PROT_PIO;
1190 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1191 id, sizeof(id[0]) * ATA_ID_WORDS);
1194 reason = "I/O error";
1198 swap_buf_le16(id, ATA_ID_WORDS);
1201 if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
1203 reason = "device reports illegal type";
1207 if (post_reset && class == ATA_DEV_ATA) {
1209 * The exact sequence expected by certain pre-ATA4 drives is:
1212 * INITIALIZE DEVICE PARAMETERS
1214 * Some drives were very specific about that exact sequence.
1216 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1217 err_mask = ata_dev_init_params(dev, id[3], id[6]);
1220 reason = "INIT_DEV_PARAMS failed";
1224 /* current CHS translation info (id[53-58]) might be
1225 * changed. reread the identify device info.
1237 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
1238 "(%s, err_mask=0x%x)\n", reason, err_mask);
1242 static inline u8 ata_dev_knobble(struct ata_device *dev)
1244 return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1248 * ata_dev_configure - Configure the specified ATA/ATAPI device
1249 * @dev: Target device to configure
1250 * @print_info: Enable device info printout
1252 * Configure @dev according to @dev->id. Generic and low-level
1253 * driver specific fixups are also applied.
1256 * Kernel thread context (may sleep)
1259 * 0 on success, -errno otherwise
1261 static int ata_dev_configure(struct ata_device *dev, int print_info)
1263 struct ata_port *ap = dev->ap;
1264 const u16 *id = dev->id;
1265 unsigned int xfer_mask;
1268 if (!ata_dev_enabled(dev)) {
1269 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1270 ap->id, dev->devno);
1274 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1276 /* print device capabilities */
1278 ata_dev_printk(dev, KERN_DEBUG, "cfg 49:%04x 82:%04x 83:%04x "
1279 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1280 id[49], id[82], id[83], id[84],
1281 id[85], id[86], id[87], id[88]);
1283 /* initialize to-be-configured parameters */
1284 dev->flags &= ~ATA_DFLAG_CFG_MASK;
1285 dev->max_sectors = 0;
1293 * common ATA, ATAPI feature tests
1296 /* find max transfer mode; for printk only */
1297 xfer_mask = ata_id_xfermask(id);
1301 /* ATA-specific feature tests */
1302 if (dev->class == ATA_DEV_ATA) {
1303 dev->n_sectors = ata_id_n_sectors(id);
1305 if (ata_id_has_lba(id)) {
1306 const char *lba_desc;
1309 dev->flags |= ATA_DFLAG_LBA;
1310 if (ata_id_has_lba48(id)) {
1311 dev->flags |= ATA_DFLAG_LBA48;
1315 /* print device info to dmesg */
1317 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
1318 "max %s, %Lu sectors: %s\n",
1319 ata_id_major_version(id),
1320 ata_mode_string(xfer_mask),
1321 (unsigned long long)dev->n_sectors,
1326 /* Default translation */
1327 dev->cylinders = id[1];
1329 dev->sectors = id[6];
1331 if (ata_id_current_chs_valid(id)) {
1332 /* Current CHS translation is valid. */
1333 dev->cylinders = id[54];
1334 dev->heads = id[55];
1335 dev->sectors = id[56];
1338 /* print device info to dmesg */
1340 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
1341 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1342 ata_id_major_version(id),
1343 ata_mode_string(xfer_mask),
1344 (unsigned long long)dev->n_sectors,
1345 dev->cylinders, dev->heads, dev->sectors);
1348 if (dev->id[59] & 0x100) {
1349 dev->multi_count = dev->id[59] & 0xff;
1350 DPRINTK("ata%u: dev %u multi count %u\n",
1351 ap->id, dev->devno, dev->multi_count);
1357 /* ATAPI-specific feature tests */
1358 else if (dev->class == ATA_DEV_ATAPI) {
1359 char *cdb_intr_string = "";
1361 rc = atapi_cdb_len(id);
1362 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1363 ata_dev_printk(dev, KERN_WARNING,
1364 "unsupported CDB len\n");
1368 dev->cdb_len = (unsigned int) rc;
1370 if (ata_id_cdb_intr(dev->id)) {
1371 dev->flags |= ATA_DFLAG_CDB_INTR;
1372 cdb_intr_string = ", CDB intr";
1375 /* print device info to dmesg */
1377 ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s%s\n",
1378 ata_mode_string(xfer_mask),
1382 ap->host->max_cmd_len = 0;
1383 for (i = 0; i < ATA_MAX_DEVICES; i++)
1384 ap->host->max_cmd_len = max_t(unsigned int,
1385 ap->host->max_cmd_len,
1386 ap->device[i].cdb_len);
1388 /* limit bridge transfers to udma5, 200 sectors */
1389 if (ata_dev_knobble(dev)) {
1391 ata_dev_printk(dev, KERN_INFO,
1392 "applying bridge limits\n");
1393 dev->udma_mask &= ATA_UDMA5;
1394 dev->max_sectors = ATA_MAX_SECTORS;
1397 if (ap->ops->dev_config)
1398 ap->ops->dev_config(ap, dev);
1400 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1404 DPRINTK("EXIT, err\n");
1409 * ata_bus_probe - Reset and probe ATA bus
1412 * Master ATA bus probing function. Initiates a hardware-dependent
1413 * bus reset, then attempts to identify any devices found on
1417 * PCI/etc. bus probe sem.
1420 * Zero on success, negative errno otherwise.
1423 static int ata_bus_probe(struct ata_port *ap)
1425 unsigned int classes[ATA_MAX_DEVICES];
1426 int tries[ATA_MAX_DEVICES];
1427 int i, rc, down_xfermask;
1428 struct ata_device *dev;
1432 for (i = 0; i < ATA_MAX_DEVICES; i++)
1433 tries[i] = ATA_PROBE_MAX_TRIES;
1438 /* reset and determine device classes */
1439 for (i = 0; i < ATA_MAX_DEVICES; i++)
1440 classes[i] = ATA_DEV_UNKNOWN;
1442 if (ap->ops->probe_reset) {
1443 rc = ap->ops->probe_reset(ap, classes);
1445 ata_port_printk(ap, KERN_ERR,
1446 "reset failed (errno=%d)\n", rc);
1450 ap->ops->phy_reset(ap);
1452 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1453 if (!(ap->flags & ATA_FLAG_DISABLED))
1454 classes[i] = ap->device[i].class;
1455 ap->device[i].class = ATA_DEV_UNKNOWN;
1461 for (i = 0; i < ATA_MAX_DEVICES; i++)
1462 if (classes[i] == ATA_DEV_UNKNOWN)
1463 classes[i] = ATA_DEV_NONE;
1465 /* read IDENTIFY page and configure devices */
1466 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1467 dev = &ap->device[i];
1470 dev->class = classes[i];
1472 if (!ata_dev_enabled(dev))
1475 rc = ata_dev_read_id(dev, &dev->class, 1, dev->id);
1479 rc = ata_dev_configure(dev, 1);
1484 /* configure transfer mode */
1485 rc = ata_set_mode(ap, &dev);
1491 for (i = 0; i < ATA_MAX_DEVICES; i++)
1492 if (ata_dev_enabled(&ap->device[i]))
1495 /* no device present, disable port */
1496 ata_port_disable(ap);
1497 ap->ops->port_disable(ap);
1504 tries[dev->devno] = 0;
1507 sata_down_spd_limit(ap);
1510 tries[dev->devno]--;
1511 if (down_xfermask &&
1512 ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
1513 tries[dev->devno] = 0;
1516 if (!tries[dev->devno]) {
1517 ata_down_xfermask_limit(dev, 1);
1518 ata_dev_disable(dev);
1525 * ata_port_probe - Mark port as enabled
1526 * @ap: Port for which we indicate enablement
1528 * Modify @ap data structure such that the system
1529 * thinks that the entire port is enabled.
1531 * LOCKING: host_set lock, or some other form of
1535 void ata_port_probe(struct ata_port *ap)
1537 ap->flags &= ~ATA_FLAG_DISABLED;
1541 * sata_print_link_status - Print SATA link status
1542 * @ap: SATA port to printk link status about
1544 * This function prints link speed and status of a SATA link.
1549 static void sata_print_link_status(struct ata_port *ap)
1551 u32 sstatus, scontrol, tmp;
1553 if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1555 sata_scr_read(ap, SCR_CONTROL, &scontrol);
1557 if (ata_port_online(ap)) {
1558 tmp = (sstatus >> 4) & 0xf;
1559 ata_port_printk(ap, KERN_INFO,
1560 "SATA link up %s (SStatus %X SControl %X)\n",
1561 sata_spd_string(tmp), sstatus, scontrol);
1563 ata_port_printk(ap, KERN_INFO,
1564 "SATA link down (SStatus %X SControl %X)\n",
1570 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1571 * @ap: SATA port associated with target SATA PHY.
1573 * This function issues commands to standard SATA Sxxx
1574 * PHY registers, to wake up the phy (and device), and
1575 * clear any reset condition.
1578 * PCI/etc. bus probe sem.
1581 void __sata_phy_reset(struct ata_port *ap)
1584 unsigned long timeout = jiffies + (HZ * 5);
1586 if (ap->flags & ATA_FLAG_SATA_RESET) {
1587 /* issue phy wake/reset */
1588 sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1589 /* Couldn't find anything in SATA I/II specs, but
1590 * AHCI-1.1 10.4.2 says at least 1 ms. */
1593 /* phy wake/clear reset */
1594 sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
1596 /* wait for phy to become ready, if necessary */
1599 sata_scr_read(ap, SCR_STATUS, &sstatus);
1600 if ((sstatus & 0xf) != 1)
1602 } while (time_before(jiffies, timeout));
1604 /* print link status */
1605 sata_print_link_status(ap);
1607 /* TODO: phy layer with polling, timeouts, etc. */
1608 if (!ata_port_offline(ap))
1611 ata_port_disable(ap);
1613 if (ap->flags & ATA_FLAG_DISABLED)
1616 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1617 ata_port_disable(ap);
1621 ap->cbl = ATA_CBL_SATA;
1625 * sata_phy_reset - Reset SATA bus.
1626 * @ap: SATA port associated with target SATA PHY.
1628 * This function resets the SATA bus, and then probes
1629 * the bus for devices.
1632 * PCI/etc. bus probe sem.
1635 void sata_phy_reset(struct ata_port *ap)
1637 __sata_phy_reset(ap);
1638 if (ap->flags & ATA_FLAG_DISABLED)
1644 * ata_dev_pair - return other device on cable
1647 * Obtain the other device on the same cable, or if none is
1648 * present NULL is returned
1651 struct ata_device *ata_dev_pair(struct ata_device *adev)
1653 struct ata_port *ap = adev->ap;
1654 struct ata_device *pair = &ap->device[1 - adev->devno];
1655 if (!ata_dev_enabled(pair))
1661 * ata_port_disable - Disable port.
1662 * @ap: Port to be disabled.
1664 * Modify @ap data structure such that the system
1665 * thinks that the entire port is disabled, and should
1666 * never attempt to probe or communicate with devices
1669 * LOCKING: host_set lock, or some other form of
1673 void ata_port_disable(struct ata_port *ap)
1675 ap->device[0].class = ATA_DEV_NONE;
1676 ap->device[1].class = ATA_DEV_NONE;
1677 ap->flags |= ATA_FLAG_DISABLED;
1681 * sata_down_spd_limit - adjust SATA spd limit downward
1682 * @ap: Port to adjust SATA spd limit for
1684 * Adjust SATA spd limit of @ap downward. Note that this
1685 * function only adjusts the limit. The change must be applied
1686 * using sata_set_spd().
1689 * Inherited from caller.
1692 * 0 on success, negative errno on failure
1694 int sata_down_spd_limit(struct ata_port *ap)
1696 u32 sstatus, spd, mask;
1699 rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
1703 mask = ap->sata_spd_limit;
1706 highbit = fls(mask) - 1;
1707 mask &= ~(1 << highbit);
1709 spd = (sstatus >> 4) & 0xf;
1713 mask &= (1 << spd) - 1;
1717 ap->sata_spd_limit = mask;
1719 ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
1720 sata_spd_string(fls(mask)));
1725 static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
1729 if (ap->sata_spd_limit == UINT_MAX)
1732 limit = fls(ap->sata_spd_limit);
1734 spd = (*scontrol >> 4) & 0xf;
1735 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
1737 return spd != limit;
1741 * sata_set_spd_needed - is SATA spd configuration needed
1742 * @ap: Port in question
1744 * Test whether the spd limit in SControl matches
1745 * @ap->sata_spd_limit. This function is used to determine
1746 * whether hardreset is necessary to apply SATA spd
1750 * Inherited from caller.
1753 * 1 if SATA spd configuration is needed, 0 otherwise.
1755 int sata_set_spd_needed(struct ata_port *ap)
1759 if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
1762 return __sata_set_spd_needed(ap, &scontrol);
1766 * sata_set_spd - set SATA spd according to spd limit
1767 * @ap: Port to set SATA spd for
1769 * Set SATA spd of @ap according to sata_spd_limit.
1772 * Inherited from caller.
1775 * 0 if spd doesn't need to be changed, 1 if spd has been
1776 * changed. Negative errno if SCR registers are inaccessible.
1778 int sata_set_spd(struct ata_port *ap)
1783 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
1786 if (!__sata_set_spd_needed(ap, &scontrol))
1789 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
1796 * This mode timing computation functionality is ported over from
1797 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1800 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1801 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1802 * for PIO 5, which is a nonstandard extension and UDMA6, which
1803 * is currently supported only by Maxtor drives.
1806 static const struct ata_timing ata_timing[] = {
1808 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1809 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1810 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1811 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1813 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1814 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1815 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1817 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1819 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1820 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1821 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1823 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1824 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1825 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1827 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1828 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1829 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1831 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1832 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1833 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1835 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1840 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1841 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1843 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1845 q->setup = EZ(t->setup * 1000, T);
1846 q->act8b = EZ(t->act8b * 1000, T);
1847 q->rec8b = EZ(t->rec8b * 1000, T);
1848 q->cyc8b = EZ(t->cyc8b * 1000, T);
1849 q->active = EZ(t->active * 1000, T);
1850 q->recover = EZ(t->recover * 1000, T);
1851 q->cycle = EZ(t->cycle * 1000, T);
1852 q->udma = EZ(t->udma * 1000, UT);
1855 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1856 struct ata_timing *m, unsigned int what)
1858 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1859 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1860 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1861 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1862 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1863 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1864 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1865 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1868 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1870 const struct ata_timing *t;
1872 for (t = ata_timing; t->mode != speed; t++)
1873 if (t->mode == 0xFF)
1878 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1879 struct ata_timing *t, int T, int UT)
1881 const struct ata_timing *s;
1882 struct ata_timing p;
1888 if (!(s = ata_timing_find_mode(speed)))
1891 memcpy(t, s, sizeof(*s));
1894 * If the drive is an EIDE drive, it can tell us it needs extended
1895 * PIO/MW_DMA cycle timing.
1898 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1899 memset(&p, 0, sizeof(p));
1900 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1901 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1902 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1903 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1904 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1906 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1910 * Convert the timing to bus clock counts.
1913 ata_timing_quantize(t, t, T, UT);
1916 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1917 * S.M.A.R.T * and some other commands. We have to ensure that the
1918 * DMA cycle timing is slower/equal than the fastest PIO timing.
1921 if (speed > XFER_PIO_4) {
1922 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1923 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1927 * Lengthen active & recovery time so that cycle time is correct.
1930 if (t->act8b + t->rec8b < t->cyc8b) {
1931 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1932 t->rec8b = t->cyc8b - t->act8b;
1935 if (t->active + t->recover < t->cycle) {
1936 t->active += (t->cycle - (t->active + t->recover)) / 2;
1937 t->recover = t->cycle - t->active;
1944 * ata_down_xfermask_limit - adjust dev xfer masks downward
1945 * @dev: Device to adjust xfer masks
1946 * @force_pio0: Force PIO0
1948 * Adjust xfer masks of @dev downward. Note that this function
1949 * does not apply the change. Invoking ata_set_mode() afterwards
1950 * will apply the limit.
1953 * Inherited from caller.
1956 * 0 on success, negative errno on failure
1958 int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
1960 unsigned long xfer_mask;
1963 xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
1968 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1969 if (xfer_mask & ATA_MASK_UDMA)
1970 xfer_mask &= ~ATA_MASK_MWDMA;
1972 highbit = fls(xfer_mask) - 1;
1973 xfer_mask &= ~(1 << highbit);
1975 xfer_mask &= 1 << ATA_SHIFT_PIO;
1979 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
1982 ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
1983 ata_mode_string(xfer_mask));
1991 static int ata_dev_set_mode(struct ata_device *dev)
1993 unsigned int err_mask;
1996 dev->flags &= ~ATA_DFLAG_PIO;
1997 if (dev->xfer_shift == ATA_SHIFT_PIO)
1998 dev->flags |= ATA_DFLAG_PIO;
2000 err_mask = ata_dev_set_xfermode(dev);
2002 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
2003 "(err_mask=0x%x)\n", err_mask);
2007 rc = ata_dev_revalidate(dev, 0);
2011 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2012 dev->xfer_shift, (int)dev->xfer_mode);
2014 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
2015 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2020 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2021 * @ap: port on which timings will be programmed
2022 * @r_failed_dev: out paramter for failed device
2024 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2025 * ata_set_mode() fails, pointer to the failing device is
2026 * returned in @r_failed_dev.
2029 * PCI/etc. bus probe sem.
2032 * 0 on success, negative errno otherwise
2034 int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
2036 struct ata_device *dev;
2037 int i, rc = 0, used_dma = 0, found = 0;
2039 /* has private set_mode? */
2040 if (ap->ops->set_mode) {
2041 /* FIXME: make ->set_mode handle no device case and
2042 * return error code and failing device on failure.
2044 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2045 if (ata_dev_enabled(&ap->device[i])) {
2046 ap->ops->set_mode(ap);
2053 /* step 1: calculate xfer_mask */
2054 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2055 unsigned int pio_mask, dma_mask;
2057 dev = &ap->device[i];
2059 if (!ata_dev_enabled(dev))
2062 ata_dev_xfermask(dev);
2064 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2065 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2066 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2067 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2076 /* step 2: always set host PIO timings */
2077 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2078 dev = &ap->device[i];
2079 if (!ata_dev_enabled(dev))
2082 if (!dev->pio_mode) {
2083 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2088 dev->xfer_mode = dev->pio_mode;
2089 dev->xfer_shift = ATA_SHIFT_PIO;
2090 if (ap->ops->set_piomode)
2091 ap->ops->set_piomode(ap, dev);
2094 /* step 3: set host DMA timings */
2095 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2096 dev = &ap->device[i];
2098 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2101 dev->xfer_mode = dev->dma_mode;
2102 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2103 if (ap->ops->set_dmamode)
2104 ap->ops->set_dmamode(ap, dev);
2107 /* step 4: update devices' xfer mode */
2108 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2109 dev = &ap->device[i];
2111 if (!ata_dev_enabled(dev))
2114 rc = ata_dev_set_mode(dev);
2119 /* Record simplex status. If we selected DMA then the other
2120 * host channels are not permitted to do so.
2122 if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
2123 ap->host_set->simplex_claimed = 1;
2125 /* step5: chip specific finalisation */
2126 if (ap->ops->post_set_mode)
2127 ap->ops->post_set_mode(ap);
2131 *r_failed_dev = dev;
2136 * ata_tf_to_host - issue ATA taskfile to host controller
2137 * @ap: port to which command is being issued
2138 * @tf: ATA taskfile register set
2140 * Issues ATA taskfile register set to ATA host controller,
2141 * with proper synchronization with interrupt handler and
2145 * spin_lock_irqsave(host_set lock)
2148 static inline void ata_tf_to_host(struct ata_port *ap,
2149 const struct ata_taskfile *tf)
2151 ap->ops->tf_load(ap, tf);
2152 ap->ops->exec_command(ap, tf);
2156 * ata_busy_sleep - sleep until BSY clears, or timeout
2157 * @ap: port containing status register to be polled
2158 * @tmout_pat: impatience timeout
2159 * @tmout: overall timeout
2161 * Sleep until ATA Status register bit BSY clears,
2162 * or a timeout occurs.
2167 unsigned int ata_busy_sleep (struct ata_port *ap,
2168 unsigned long tmout_pat, unsigned long tmout)
2170 unsigned long timer_start, timeout;
2173 status = ata_busy_wait(ap, ATA_BUSY, 300);
2174 timer_start = jiffies;
2175 timeout = timer_start + tmout_pat;
2176 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2178 status = ata_busy_wait(ap, ATA_BUSY, 3);
2181 if (status & ATA_BUSY)
2182 ata_port_printk(ap, KERN_WARNING,
2183 "port is slow to respond, please be patient\n");
2185 timeout = timer_start + tmout;
2186 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2188 status = ata_chk_status(ap);
2191 if (status & ATA_BUSY) {
2192 ata_port_printk(ap, KERN_ERR, "port failed to respond "
2193 "(%lu secs)\n", tmout / HZ);
2200 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2202 struct ata_ioports *ioaddr = &ap->ioaddr;
2203 unsigned int dev0 = devmask & (1 << 0);
2204 unsigned int dev1 = devmask & (1 << 1);
2205 unsigned long timeout;
2207 /* if device 0 was found in ata_devchk, wait for its
2211 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2213 /* if device 1 was found in ata_devchk, wait for
2214 * register access, then wait for BSY to clear
2216 timeout = jiffies + ATA_TMOUT_BOOT;
2220 ap->ops->dev_select(ap, 1);
2221 if (ap->flags & ATA_FLAG_MMIO) {
2222 nsect = readb((void __iomem *) ioaddr->nsect_addr);
2223 lbal = readb((void __iomem *) ioaddr->lbal_addr);
2225 nsect = inb(ioaddr->nsect_addr);
2226 lbal = inb(ioaddr->lbal_addr);
2228 if ((nsect == 1) && (lbal == 1))
2230 if (time_after(jiffies, timeout)) {
2234 msleep(50); /* give drive a breather */
2237 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2239 /* is all this really necessary? */
2240 ap->ops->dev_select(ap, 0);
2242 ap->ops->dev_select(ap, 1);
2244 ap->ops->dev_select(ap, 0);
2247 static unsigned int ata_bus_softreset(struct ata_port *ap,
2248 unsigned int devmask)
2250 struct ata_ioports *ioaddr = &ap->ioaddr;
2252 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2254 /* software reset. causes dev0 to be selected */
2255 if (ap->flags & ATA_FLAG_MMIO) {
2256 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2257 udelay(20); /* FIXME: flush */
2258 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2259 udelay(20); /* FIXME: flush */
2260 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2262 outb(ap->ctl, ioaddr->ctl_addr);
2264 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2266 outb(ap->ctl, ioaddr->ctl_addr);
2269 /* spec mandates ">= 2ms" before checking status.
2270 * We wait 150ms, because that was the magic delay used for
2271 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2272 * between when the ATA command register is written, and then
2273 * status is checked. Because waiting for "a while" before
2274 * checking status is fine, post SRST, we perform this magic
2275 * delay here as well.
2277 * Old drivers/ide uses the 2mS rule and then waits for ready
2281 /* Before we perform post reset processing we want to see if
2282 * the bus shows 0xFF because the odd clown forgets the D7
2283 * pulldown resistor.
2285 if (ata_check_status(ap) == 0xFF) {
2286 ata_port_printk(ap, KERN_ERR, "SRST failed (status 0xFF)\n");
2287 return AC_ERR_OTHER;
2290 ata_bus_post_reset(ap, devmask);
2296 * ata_bus_reset - reset host port and associated ATA channel
2297 * @ap: port to reset
2299 * This is typically the first time we actually start issuing
2300 * commands to the ATA channel. We wait for BSY to clear, then
2301 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2302 * result. Determine what devices, if any, are on the channel
2303 * by looking at the device 0/1 error register. Look at the signature
2304 * stored in each device's taskfile registers, to determine if
2305 * the device is ATA or ATAPI.
2308 * PCI/etc. bus probe sem.
2309 * Obtains host_set lock.
2312 * Sets ATA_FLAG_DISABLED if bus reset fails.
2315 void ata_bus_reset(struct ata_port *ap)
2317 struct ata_ioports *ioaddr = &ap->ioaddr;
2318 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2320 unsigned int dev0, dev1 = 0, devmask = 0;
2322 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2324 /* determine if device 0/1 are present */
2325 if (ap->flags & ATA_FLAG_SATA_RESET)
2328 dev0 = ata_devchk(ap, 0);
2330 dev1 = ata_devchk(ap, 1);
2334 devmask |= (1 << 0);
2336 devmask |= (1 << 1);
2338 /* select device 0 again */
2339 ap->ops->dev_select(ap, 0);
2341 /* issue bus reset */
2342 if (ap->flags & ATA_FLAG_SRST)
2343 if (ata_bus_softreset(ap, devmask))
2347 * determine by signature whether we have ATA or ATAPI devices
2349 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2350 if ((slave_possible) && (err != 0x81))
2351 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2353 /* re-enable interrupts */
2354 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2357 /* is double-select really necessary? */
2358 if (ap->device[1].class != ATA_DEV_NONE)
2359 ap->ops->dev_select(ap, 1);
2360 if (ap->device[0].class != ATA_DEV_NONE)
2361 ap->ops->dev_select(ap, 0);
2363 /* if no devices were detected, disable this port */
2364 if ((ap->device[0].class == ATA_DEV_NONE) &&
2365 (ap->device[1].class == ATA_DEV_NONE))
2368 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2369 /* set up device control for ATA_FLAG_SATA_RESET */
2370 if (ap->flags & ATA_FLAG_MMIO)
2371 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2373 outb(ap->ctl, ioaddr->ctl_addr);
2380 ata_port_printk(ap, KERN_ERR, "disabling port\n");
2381 ap->ops->port_disable(ap);
2386 static int sata_phy_resume(struct ata_port *ap)
2388 unsigned long timeout = jiffies + (HZ * 5);
2389 u32 scontrol, sstatus;
2392 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2395 scontrol = (scontrol & 0x0f0) | 0x300;
2397 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2400 /* Wait for phy to become ready, if necessary. */
2403 if ((rc = sata_scr_read(ap, SCR_STATUS, &sstatus)))
2405 if ((sstatus & 0xf) != 1)
2407 } while (time_before(jiffies, timeout));
2413 * ata_std_probeinit - initialize probing
2414 * @ap: port to be probed
2416 * @ap is about to be probed. Initialize it. This function is
2417 * to be used as standard callback for ata_drive_probe_reset().
2419 * NOTE!!! Do not use this function as probeinit if a low level
2420 * driver implements only hardreset. Just pass NULL as probeinit
2421 * in that case. Using this function is probably okay but doing
2422 * so makes reset sequence different from the original
2423 * ->phy_reset implementation and Jeff nervous. :-P
2425 void ata_std_probeinit(struct ata_port *ap)
2430 sata_phy_resume(ap);
2432 /* init sata_spd_limit to the current value */
2433 if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
2434 int spd = (scontrol >> 4) & 0xf;
2435 ap->sata_spd_limit &= (1 << spd) - 1;
2438 /* wait for device */
2439 if (ata_port_online(ap))
2440 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2444 * ata_std_softreset - reset host port via ATA SRST
2445 * @ap: port to reset
2446 * @classes: resulting classes of attached devices
2448 * Reset host port using ATA SRST. This function is to be used
2449 * as standard callback for ata_drive_*_reset() functions.
2452 * Kernel thread context (may sleep)
2455 * 0 on success, -errno otherwise.
2457 int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2459 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2460 unsigned int devmask = 0, err_mask;
2465 if (ata_port_offline(ap)) {
2466 classes[0] = ATA_DEV_NONE;
2470 /* determine if device 0/1 are present */
2471 if (ata_devchk(ap, 0))
2472 devmask |= (1 << 0);
2473 if (slave_possible && ata_devchk(ap, 1))
2474 devmask |= (1 << 1);
2476 /* select device 0 again */
2477 ap->ops->dev_select(ap, 0);
2479 /* issue bus reset */
2480 DPRINTK("about to softreset, devmask=%x\n", devmask);
2481 err_mask = ata_bus_softreset(ap, devmask);
2483 ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
2488 /* determine by signature whether we have ATA or ATAPI devices */
2489 classes[0] = ata_dev_try_classify(ap, 0, &err);
2490 if (slave_possible && err != 0x81)
2491 classes[1] = ata_dev_try_classify(ap, 1, &err);
2494 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2499 * sata_std_hardreset - reset host port via SATA phy reset
2500 * @ap: port to reset
2501 * @class: resulting class of attached device
2503 * SATA phy-reset host port using DET bits of SControl register.
2504 * This function is to be used as standard callback for
2505 * ata_drive_*_reset().
2508 * Kernel thread context (may sleep)
2511 * 0 on success, -errno otherwise.
2513 int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
2520 if (sata_set_spd_needed(ap)) {
2521 /* SATA spec says nothing about how to reconfigure
2522 * spd. To be on the safe side, turn off phy during
2523 * reconfiguration. This works for at least ICH7 AHCI
2526 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2529 scontrol = (scontrol & 0x0f0) | 0x302;
2531 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2537 /* issue phy wake/reset */
2538 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2541 scontrol = (scontrol & 0x0f0) | 0x301;
2543 if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
2546 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2547 * 10.4.2 says at least 1 ms.
2551 /* bring phy back */
2552 sata_phy_resume(ap);
2554 /* TODO: phy layer with polling, timeouts, etc. */
2555 if (ata_port_offline(ap)) {
2556 *class = ATA_DEV_NONE;
2557 DPRINTK("EXIT, link offline\n");
2561 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2562 ata_port_printk(ap, KERN_ERR,
2563 "COMRESET failed (device not ready)\n");
2567 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2569 *class = ata_dev_try_classify(ap, 0, NULL);
2571 DPRINTK("EXIT, class=%u\n", *class);
2576 * ata_std_postreset - standard postreset callback
2577 * @ap: the target ata_port
2578 * @classes: classes of attached devices
2580 * This function is invoked after a successful reset. Note that
2581 * the device might have been reset more than once using
2582 * different reset methods before postreset is invoked.
2584 * This function is to be used as standard callback for
2585 * ata_drive_*_reset().
2588 * Kernel thread context (may sleep)
2590 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2596 /* print link status */
2597 sata_print_link_status(ap);
2600 if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
2601 sata_scr_write(ap, SCR_ERROR, serror);
2603 /* re-enable interrupts */
2604 if (!ap->ops->error_handler) {
2605 /* FIXME: hack. create a hook instead */
2606 if (ap->ioaddr.ctl_addr)
2610 /* is double-select really necessary? */
2611 if (classes[0] != ATA_DEV_NONE)
2612 ap->ops->dev_select(ap, 1);
2613 if (classes[1] != ATA_DEV_NONE)
2614 ap->ops->dev_select(ap, 0);
2616 /* bail out if no device is present */
2617 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2618 DPRINTK("EXIT, no device\n");
2622 /* set up device control */
2623 if (ap->ioaddr.ctl_addr) {
2624 if (ap->flags & ATA_FLAG_MMIO)
2625 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2627 outb(ap->ctl, ap->ioaddr.ctl_addr);
2634 * ata_std_probe_reset - standard probe reset method
2635 * @ap: prot to perform probe-reset
2636 * @classes: resulting classes of attached devices
2638 * The stock off-the-shelf ->probe_reset method.
2641 * Kernel thread context (may sleep)
2644 * 0 on success, -errno otherwise.
2646 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2648 ata_reset_fn_t hardreset;
2651 if (sata_scr_valid(ap))
2652 hardreset = sata_std_hardreset;
2654 return ata_drive_probe_reset(ap, ata_std_probeinit,
2655 ata_std_softreset, hardreset,
2656 ata_std_postreset, classes);
2659 int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
2660 unsigned int *classes)
2664 for (i = 0; i < ATA_MAX_DEVICES; i++)
2665 classes[i] = ATA_DEV_UNKNOWN;
2667 rc = reset(ap, classes);
2671 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2672 * is complete and convert all ATA_DEV_UNKNOWN to
2675 for (i = 0; i < ATA_MAX_DEVICES; i++)
2676 if (classes[i] != ATA_DEV_UNKNOWN)
2679 if (i < ATA_MAX_DEVICES)
2680 for (i = 0; i < ATA_MAX_DEVICES; i++)
2681 if (classes[i] == ATA_DEV_UNKNOWN)
2682 classes[i] = ATA_DEV_NONE;
2688 * ata_drive_probe_reset - Perform probe reset with given methods
2689 * @ap: port to reset
2690 * @probeinit: probeinit method (can be NULL)
2691 * @softreset: softreset method (can be NULL)
2692 * @hardreset: hardreset method (can be NULL)
2693 * @postreset: postreset method (can be NULL)
2694 * @classes: resulting classes of attached devices
2696 * Reset the specified port and classify attached devices using
2697 * given methods. This function prefers softreset but tries all
2698 * possible reset sequences to reset and classify devices. This
2699 * function is intended to be used for constructing ->probe_reset
2700 * callback by low level drivers.
2702 * Reset methods should follow the following rules.
2704 * - Return 0 on sucess, -errno on failure.
2705 * - If classification is supported, fill classes[] with
2706 * recognized class codes.
2707 * - If classification is not supported, leave classes[] alone.
2710 * Kernel thread context (may sleep)
2713 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2714 * if classification fails, and any error code from reset
2717 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2718 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2719 ata_postreset_fn_t postreset, unsigned int *classes)
2723 ata_eh_freeze_port(ap);
2728 if (softreset && !sata_set_spd_needed(ap)) {
2729 rc = ata_do_reset(ap, softreset, classes);
2730 if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
2732 ata_port_printk(ap, KERN_INFO, "softreset failed, "
2733 "will try hardreset in 5 secs\n");
2741 rc = ata_do_reset(ap, hardreset, classes);
2743 if (classes[0] != ATA_DEV_UNKNOWN)
2748 if (sata_down_spd_limit(ap))
2751 ata_port_printk(ap, KERN_INFO, "hardreset failed, "
2752 "will retry in 5 secs\n");
2757 ata_port_printk(ap, KERN_INFO,
2758 "hardreset succeeded without classification, "
2759 "will retry softreset in 5 secs\n");
2762 rc = ata_do_reset(ap, softreset, classes);
2768 postreset(ap, classes);
2770 ata_eh_thaw_port(ap);
2772 if (classes[0] == ATA_DEV_UNKNOWN)
2779 * ata_dev_same_device - Determine whether new ID matches configured device
2780 * @dev: device to compare against
2781 * @new_class: class of the new device
2782 * @new_id: IDENTIFY page of the new device
2784 * Compare @new_class and @new_id against @dev and determine
2785 * whether @dev is the device indicated by @new_class and
2792 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2794 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
2797 const u16 *old_id = dev->id;
2798 unsigned char model[2][41], serial[2][21];
2801 if (dev->class != new_class) {
2802 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
2803 dev->class, new_class);
2807 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2808 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2809 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2810 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2811 new_n_sectors = ata_id_n_sectors(new_id);
2813 if (strcmp(model[0], model[1])) {
2814 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
2815 "'%s' != '%s'\n", model[0], model[1]);
2819 if (strcmp(serial[0], serial[1])) {
2820 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
2821 "'%s' != '%s'\n", serial[0], serial[1]);
2825 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2826 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
2828 (unsigned long long)dev->n_sectors,
2829 (unsigned long long)new_n_sectors);
2837 * ata_dev_revalidate - Revalidate ATA device
2838 * @dev: device to revalidate
2839 * @post_reset: is this revalidation after reset?
2841 * Re-read IDENTIFY page and make sure @dev is still attached to
2845 * Kernel thread context (may sleep)
2848 * 0 on success, negative errno otherwise
2850 int ata_dev_revalidate(struct ata_device *dev, int post_reset)
2852 unsigned int class = dev->class;
2853 u16 *id = (void *)dev->ap->sector_buf;
2856 if (!ata_dev_enabled(dev)) {
2862 rc = ata_dev_read_id(dev, &class, post_reset, id);
2866 /* is the device still there? */
2867 if (!ata_dev_same_device(dev, class, id)) {
2872 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
2874 /* configure device according to the new ID */
2875 rc = ata_dev_configure(dev, 0);
2880 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
2884 static const char * const ata_dma_blacklist [] = {
2885 "WDC AC11000H", NULL,
2886 "WDC AC22100H", NULL,
2887 "WDC AC32500H", NULL,
2888 "WDC AC33100H", NULL,
2889 "WDC AC31600H", NULL,
2890 "WDC AC32100H", "24.09P07",
2891 "WDC AC23200L", "21.10N21",
2892 "Compaq CRD-8241B", NULL,
2897 "SanDisk SDP3B", NULL,
2898 "SanDisk SDP3B-64", NULL,
2899 "SANYO CD-ROM CRD", NULL,
2900 "HITACHI CDR-8", NULL,
2901 "HITACHI CDR-8335", NULL,
2902 "HITACHI CDR-8435", NULL,
2903 "Toshiba CD-ROM XM-6202B", NULL,
2904 "TOSHIBA CD-ROM XM-1702BC", NULL,
2906 "E-IDE CD-ROM CR-840", NULL,
2907 "CD-ROM Drive/F5A", NULL,
2908 "WPI CDD-820", NULL,
2909 "SAMSUNG CD-ROM SC-148C", NULL,
2910 "SAMSUNG CD-ROM SC", NULL,
2911 "SanDisk SDP3B-64", NULL,
2912 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2913 "_NEC DV5800A", NULL,
2914 "SAMSUNG CD-ROM SN-124", "N001"
2917 static int ata_strim(char *s, size_t len)
2919 len = strnlen(s, len);
2921 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2922 while ((len > 0) && (s[len - 1] == ' ')) {
2929 static int ata_dma_blacklisted(const struct ata_device *dev)
2931 unsigned char model_num[40];
2932 unsigned char model_rev[16];
2933 unsigned int nlen, rlen;
2936 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2938 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2940 nlen = ata_strim(model_num, sizeof(model_num));
2941 rlen = ata_strim(model_rev, sizeof(model_rev));
2943 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2944 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2945 if (ata_dma_blacklist[i+1] == NULL)
2947 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2955 * ata_dev_xfermask - Compute supported xfermask of the given device
2956 * @dev: Device to compute xfermask for
2958 * Compute supported xfermask of @dev and store it in
2959 * dev->*_mask. This function is responsible for applying all
2960 * known limits including host controller limits, device
2963 * FIXME: The current implementation limits all transfer modes to
2964 * the fastest of the lowested device on the port. This is not
2965 * required on most controllers.
2970 static void ata_dev_xfermask(struct ata_device *dev)
2972 struct ata_port *ap = dev->ap;
2973 struct ata_host_set *hs = ap->host_set;
2974 unsigned long xfer_mask;
2977 xfer_mask = ata_pack_xfermask(ap->pio_mask,
2978 ap->mwdma_mask, ap->udma_mask);
2980 /* Apply cable rule here. Don't apply it early because when
2981 * we handle hot plug the cable type can itself change.
2983 if (ap->cbl == ATA_CBL_PATA40)
2984 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
2986 /* FIXME: Use port-wide xfermask for now */
2987 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2988 struct ata_device *d = &ap->device[i];
2990 if (ata_dev_absent(d))
2993 if (ata_dev_disabled(d)) {
2994 /* to avoid violating device selection timing */
2995 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2996 UINT_MAX, UINT_MAX);
3000 xfer_mask &= ata_pack_xfermask(d->pio_mask,
3001 d->mwdma_mask, d->udma_mask);
3002 xfer_mask &= ata_id_xfermask(d->id);
3003 if (ata_dma_blacklisted(d))
3004 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3007 if (ata_dma_blacklisted(dev))
3008 ata_dev_printk(dev, KERN_WARNING,
3009 "device is on DMA blacklist, disabling DMA\n");
3011 if (hs->flags & ATA_HOST_SIMPLEX) {
3012 if (hs->simplex_claimed)
3013 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3016 if (ap->ops->mode_filter)
3017 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
3019 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
3020 &dev->mwdma_mask, &dev->udma_mask);
3024 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3025 * @dev: Device to which command will be sent
3027 * Issue SET FEATURES - XFER MODE command to device @dev
3031 * PCI/etc. bus probe sem.
3034 * 0 on success, AC_ERR_* mask otherwise.
3037 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
3039 struct ata_taskfile tf;
3040 unsigned int err_mask;
3042 /* set up set-features taskfile */
3043 DPRINTK("set features - xfer mode\n");
3045 ata_tf_init(dev, &tf);
3046 tf.command = ATA_CMD_SET_FEATURES;
3047 tf.feature = SETFEATURES_XFER;
3048 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3049 tf.protocol = ATA_PROT_NODATA;
3050 tf.nsect = dev->xfer_mode;
3052 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3054 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3059 * ata_dev_init_params - Issue INIT DEV PARAMS command
3060 * @dev: Device to which command will be sent
3061 * @heads: Number of heads
3062 * @sectors: Number of sectors
3065 * Kernel thread context (may sleep)
3068 * 0 on success, AC_ERR_* mask otherwise.
3070 static unsigned int ata_dev_init_params(struct ata_device *dev,
3071 u16 heads, u16 sectors)
3073 struct ata_taskfile tf;
3074 unsigned int err_mask;
3076 /* Number of sectors per track 1-255. Number of heads 1-16 */
3077 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3078 return AC_ERR_INVALID;
3080 /* set up init dev params taskfile */
3081 DPRINTK("init dev params \n");
3083 ata_tf_init(dev, &tf);
3084 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3085 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3086 tf.protocol = ATA_PROT_NODATA;
3088 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
3090 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3092 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3097 * ata_sg_clean - Unmap DMA memory associated with command
3098 * @qc: Command containing DMA memory to be released
3100 * Unmap all mapped DMA memory associated with this command.
3103 * spin_lock_irqsave(host_set lock)
3106 static void ata_sg_clean(struct ata_queued_cmd *qc)
3108 struct ata_port *ap = qc->ap;
3109 struct scatterlist *sg = qc->__sg;
3110 int dir = qc->dma_dir;
3111 void *pad_buf = NULL;
3113 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3114 WARN_ON(sg == NULL);
3116 if (qc->flags & ATA_QCFLAG_SINGLE)
3117 WARN_ON(qc->n_elem > 1);
3119 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
3121 /* if we padded the buffer out to 32-bit bound, and data
3122 * xfer direction is from-device, we must copy from the
3123 * pad buffer back into the supplied buffer
3125 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
3126 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3128 if (qc->flags & ATA_QCFLAG_SG) {
3130 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3131 /* restore last sg */
3132 sg[qc->orig_n_elem - 1].length += qc->pad_len;
3134 struct scatterlist *psg = &qc->pad_sgent;
3135 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3136 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
3137 kunmap_atomic(addr, KM_IRQ0);
3141 dma_unmap_single(ap->dev,
3142 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
3145 sg->length += qc->pad_len;
3147 memcpy(qc->buf_virt + sg->length - qc->pad_len,
3148 pad_buf, qc->pad_len);
3151 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3156 * ata_fill_sg - Fill PCI IDE PRD table
3157 * @qc: Metadata associated with taskfile to be transferred
3159 * Fill PCI IDE PRD (scatter-gather) table with segments
3160 * associated with the current disk command.
3163 * spin_lock_irqsave(host_set lock)
3166 static void ata_fill_sg(struct ata_queued_cmd *qc)
3168 struct ata_port *ap = qc->ap;
3169 struct scatterlist *sg;
3172 WARN_ON(qc->__sg == NULL);
3173 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
3176 ata_for_each_sg(sg, qc) {
3180 /* determine if physical DMA addr spans 64K boundary.
3181 * Note h/w doesn't support 64-bit, so we unconditionally
3182 * truncate dma_addr_t to u32.
3184 addr = (u32) sg_dma_address(sg);
3185 sg_len = sg_dma_len(sg);
3188 offset = addr & 0xffff;
3190 if ((offset + sg_len) > 0x10000)
3191 len = 0x10000 - offset;
3193 ap->prd[idx].addr = cpu_to_le32(addr);
3194 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
3195 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
3204 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
3207 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3208 * @qc: Metadata associated with taskfile to check
3210 * Allow low-level driver to filter ATA PACKET commands, returning
3211 * a status indicating whether or not it is OK to use DMA for the
3212 * supplied PACKET command.
3215 * spin_lock_irqsave(host_set lock)
3217 * RETURNS: 0 when ATAPI DMA can be used
3220 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3222 struct ata_port *ap = qc->ap;
3223 int rc = 0; /* Assume ATAPI DMA is OK by default */
3225 if (ap->ops->check_atapi_dma)
3226 rc = ap->ops->check_atapi_dma(qc);
3228 /* We don't support polling DMA.
3229 * Use PIO if the LLDD handles only interrupts in
3230 * the HSM_ST_LAST state and the ATAPI device
3231 * generates CDB interrupts.
3233 if ((ap->flags & ATA_FLAG_PIO_POLLING) &&
3234 (qc->dev->flags & ATA_DFLAG_CDB_INTR))
3240 * ata_qc_prep - Prepare taskfile for submission
3241 * @qc: Metadata associated with taskfile to be prepared
3243 * Prepare ATA taskfile for submission.
3246 * spin_lock_irqsave(host_set lock)
3248 void ata_qc_prep(struct ata_queued_cmd *qc)
3250 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3256 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
3259 * ata_sg_init_one - Associate command with memory buffer
3260 * @qc: Command to be associated
3261 * @buf: Memory buffer
3262 * @buflen: Length of memory buffer, in bytes.
3264 * Initialize the data-related elements of queued_cmd @qc
3265 * to point to a single memory buffer, @buf of byte length @buflen.
3268 * spin_lock_irqsave(host_set lock)
3271 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3273 struct scatterlist *sg;
3275 qc->flags |= ATA_QCFLAG_SINGLE;
3277 memset(&qc->sgent, 0, sizeof(qc->sgent));
3278 qc->__sg = &qc->sgent;
3280 qc->orig_n_elem = 1;
3284 sg_init_one(sg, buf, buflen);
3288 * ata_sg_init - Associate command with scatter-gather table.
3289 * @qc: Command to be associated
3290 * @sg: Scatter-gather table.
3291 * @n_elem: Number of elements in s/g table.
3293 * Initialize the data-related elements of queued_cmd @qc
3294 * to point to a scatter-gather table @sg, containing @n_elem
3298 * spin_lock_irqsave(host_set lock)
3301 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3302 unsigned int n_elem)
3304 qc->flags |= ATA_QCFLAG_SG;
3306 qc->n_elem = n_elem;
3307 qc->orig_n_elem = n_elem;
3311 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3312 * @qc: Command with memory buffer to be mapped.
3314 * DMA-map the memory buffer associated with queued_cmd @qc.
3317 * spin_lock_irqsave(host_set lock)
3320 * Zero on success, negative on error.
3323 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3325 struct ata_port *ap = qc->ap;
3326 int dir = qc->dma_dir;
3327 struct scatterlist *sg = qc->__sg;
3328 dma_addr_t dma_address;
3331 /* we must lengthen transfers to end on a 32-bit boundary */
3332 qc->pad_len = sg->length & 3;
3334 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3335 struct scatterlist *psg = &qc->pad_sgent;
3337 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3339 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3341 if (qc->tf.flags & ATA_TFLAG_WRITE)
3342 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3345 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3346 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3348 sg->length -= qc->pad_len;
3349 if (sg->length == 0)
3352 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3353 sg->length, qc->pad_len);
3361 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3363 if (dma_mapping_error(dma_address)) {
3365 sg->length += qc->pad_len;
3369 sg_dma_address(sg) = dma_address;
3370 sg_dma_len(sg) = sg->length;
3373 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3374 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3380 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3381 * @qc: Command with scatter-gather table to be mapped.
3383 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3386 * spin_lock_irqsave(host_set lock)
3389 * Zero on success, negative on error.
3393 static int ata_sg_setup(struct ata_queued_cmd *qc)
3395 struct ata_port *ap = qc->ap;
3396 struct scatterlist *sg = qc->__sg;
3397 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3398 int n_elem, pre_n_elem, dir, trim_sg = 0;
3400 VPRINTK("ENTER, ata%u\n", ap->id);
3401 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3403 /* we must lengthen transfers to end on a 32-bit boundary */
3404 qc->pad_len = lsg->length & 3;
3406 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3407 struct scatterlist *psg = &qc->pad_sgent;
3408 unsigned int offset;
3410 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3412 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3415 * psg->page/offset are used to copy to-be-written
3416 * data in this function or read data in ata_sg_clean.
3418 offset = lsg->offset + lsg->length - qc->pad_len;
3419 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3420 psg->offset = offset_in_page(offset);
3422 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3423 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3424 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3425 kunmap_atomic(addr, KM_IRQ0);
3428 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3429 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3431 lsg->length -= qc->pad_len;
3432 if (lsg->length == 0)
3435 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3436 qc->n_elem - 1, lsg->length, qc->pad_len);
3439 pre_n_elem = qc->n_elem;
3440 if (trim_sg && pre_n_elem)
3449 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3451 /* restore last sg */
3452 lsg->length += qc->pad_len;
3456 DPRINTK("%d sg elements mapped\n", n_elem);
3459 qc->n_elem = n_elem;
3465 * ata_poll_qc_complete - turn irq back on and finish qc
3466 * @qc: Command to complete
3467 * @err_mask: ATA status register content
3470 * None. (grabs host lock)
3472 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3474 struct ata_port *ap = qc->ap;
3475 unsigned long flags;
3477 spin_lock_irqsave(&ap->host_set->lock, flags);
3479 if (ap->ops->error_handler) {
3480 /* EH might have kicked in while host_set lock is released */
3481 qc = ata_qc_from_tag(ap, qc->tag);
3483 if (!(qc->err_mask & AC_ERR_HSM)) {
3485 ata_qc_complete(qc);
3487 ata_port_freeze(ap);
3492 ata_qc_complete(qc);
3495 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3499 * swap_buf_le16 - swap halves of 16-bit words in place
3500 * @buf: Buffer to swap
3501 * @buf_words: Number of 16-bit words in buffer.
3503 * Swap halves of 16-bit words if needed to convert from
3504 * little-endian byte order to native cpu byte order, or
3508 * Inherited from caller.
3510 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3515 for (i = 0; i < buf_words; i++)
3516 buf[i] = le16_to_cpu(buf[i]);
3517 #endif /* __BIG_ENDIAN */
3521 * ata_mmio_data_xfer - Transfer data by MMIO
3522 * @ap: port to read/write
3524 * @buflen: buffer length
3525 * @write_data: read/write
3527 * Transfer data from/to the device data register by MMIO.
3530 * Inherited from caller.
3533 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3534 unsigned int buflen, int write_data)
3537 unsigned int words = buflen >> 1;
3538 u16 *buf16 = (u16 *) buf;
3539 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3541 /* Transfer multiple of 2 bytes */
3543 for (i = 0; i < words; i++)
3544 writew(le16_to_cpu(buf16[i]), mmio);
3546 for (i = 0; i < words; i++)
3547 buf16[i] = cpu_to_le16(readw(mmio));
3550 /* Transfer trailing 1 byte, if any. */
3551 if (unlikely(buflen & 0x01)) {
3552 u16 align_buf[1] = { 0 };
3553 unsigned char *trailing_buf = buf + buflen - 1;
3556 memcpy(align_buf, trailing_buf, 1);
3557 writew(le16_to_cpu(align_buf[0]), mmio);
3559 align_buf[0] = cpu_to_le16(readw(mmio));
3560 memcpy(trailing_buf, align_buf, 1);
3566 * ata_pio_data_xfer - Transfer data by PIO
3567 * @ap: port to read/write
3569 * @buflen: buffer length
3570 * @write_data: read/write
3572 * Transfer data from/to the device data register by PIO.
3575 * Inherited from caller.
3578 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3579 unsigned int buflen, int write_data)
3581 unsigned int words = buflen >> 1;
3583 /* Transfer multiple of 2 bytes */
3585 outsw(ap->ioaddr.data_addr, buf, words);
3587 insw(ap->ioaddr.data_addr, buf, words);
3589 /* Transfer trailing 1 byte, if any. */
3590 if (unlikely(buflen & 0x01)) {
3591 u16 align_buf[1] = { 0 };
3592 unsigned char *trailing_buf = buf + buflen - 1;
3595 memcpy(align_buf, trailing_buf, 1);
3596 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3598 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3599 memcpy(trailing_buf, align_buf, 1);
3605 * ata_data_xfer - Transfer data from/to the data register.
3606 * @ap: port to read/write
3608 * @buflen: buffer length
3609 * @do_write: read/write
3611 * Transfer data from/to the device data register.
3614 * Inherited from caller.
3617 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3618 unsigned int buflen, int do_write)
3620 /* Make the crap hardware pay the costs not the good stuff */
3621 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3622 unsigned long flags;
3623 local_irq_save(flags);
3624 if (ap->flags & ATA_FLAG_MMIO)
3625 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3627 ata_pio_data_xfer(ap, buf, buflen, do_write);
3628 local_irq_restore(flags);
3630 if (ap->flags & ATA_FLAG_MMIO)
3631 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3633 ata_pio_data_xfer(ap, buf, buflen, do_write);
3638 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3639 * @qc: Command on going
3641 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3644 * Inherited from caller.
3647 static void ata_pio_sector(struct ata_queued_cmd *qc)
3649 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3650 struct scatterlist *sg = qc->__sg;
3651 struct ata_port *ap = qc->ap;
3653 unsigned int offset;
3656 if (qc->cursect == (qc->nsect - 1))
3657 ap->hsm_task_state = HSM_ST_LAST;
3659 page = sg[qc->cursg].page;
3660 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3662 /* get the current page and offset */
3663 page = nth_page(page, (offset >> PAGE_SHIFT));
3664 offset %= PAGE_SIZE;
3666 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3668 if (PageHighMem(page)) {
3669 unsigned long flags;
3671 local_irq_save(flags);
3672 buf = kmap_atomic(page, KM_IRQ0);
3674 /* do the actual data transfer */
3675 ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
3677 kunmap_atomic(buf, KM_IRQ0);
3678 local_irq_restore(flags);
3680 buf = page_address(page);
3681 ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
3687 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3694 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3695 * @qc: Command on going
3697 * Transfer one or many ATA_SECT_SIZE of data from/to the
3698 * ATA device for the DRQ request.
3701 * Inherited from caller.
3704 static void ata_pio_sectors(struct ata_queued_cmd *qc)
3706 if (is_multi_taskfile(&qc->tf)) {
3707 /* READ/WRITE MULTIPLE */
3710 WARN_ON(qc->dev->multi_count == 0);
3712 nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
3720 * atapi_send_cdb - Write CDB bytes to hardware
3721 * @ap: Port to which ATAPI device is attached.
3722 * @qc: Taskfile currently active
3724 * When device has indicated its readiness to accept
3725 * a CDB, this function is called. Send the CDB.
3731 static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
3734 DPRINTK("send cdb\n");
3735 WARN_ON(qc->dev->cdb_len < 12);
3737 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3738 ata_altstatus(ap); /* flush */
3740 switch (qc->tf.protocol) {
3741 case ATA_PROT_ATAPI:
3742 ap->hsm_task_state = HSM_ST;
3744 case ATA_PROT_ATAPI_NODATA:
3745 ap->hsm_task_state = HSM_ST_LAST;
3747 case ATA_PROT_ATAPI_DMA:
3748 ap->hsm_task_state = HSM_ST_LAST;
3749 /* initiate bmdma */
3750 ap->ops->bmdma_start(qc);
3756 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3757 * @qc: Command on going
3758 * @bytes: number of bytes
3760 * Transfer Transfer data from/to the ATAPI device.
3763 * Inherited from caller.
3767 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3769 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3770 struct scatterlist *sg = qc->__sg;
3771 struct ata_port *ap = qc->ap;
3774 unsigned int offset, count;
3776 if (qc->curbytes + bytes >= qc->nbytes)
3777 ap->hsm_task_state = HSM_ST_LAST;
3780 if (unlikely(qc->cursg >= qc->n_elem)) {
3782 * The end of qc->sg is reached and the device expects
3783 * more data to transfer. In order not to overrun qc->sg
3784 * and fulfill length specified in the byte count register,
3785 * - for read case, discard trailing data from the device
3786 * - for write case, padding zero data to the device
3788 u16 pad_buf[1] = { 0 };
3789 unsigned int words = bytes >> 1;
3792 if (words) /* warning if bytes > 1 */
3793 ata_dev_printk(qc->dev, KERN_WARNING,
3794 "%u bytes trailing data\n", bytes);
3796 for (i = 0; i < words; i++)
3797 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3799 ap->hsm_task_state = HSM_ST_LAST;
3803 sg = &qc->__sg[qc->cursg];
3806 offset = sg->offset + qc->cursg_ofs;
3808 /* get the current page and offset */
3809 page = nth_page(page, (offset >> PAGE_SHIFT));
3810 offset %= PAGE_SIZE;
3812 /* don't overrun current sg */
3813 count = min(sg->length - qc->cursg_ofs, bytes);
3815 /* don't cross page boundaries */
3816 count = min(count, (unsigned int)PAGE_SIZE - offset);
3818 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3820 if (PageHighMem(page)) {
3821 unsigned long flags;
3823 local_irq_save(flags);
3824 buf = kmap_atomic(page, KM_IRQ0);
3826 /* do the actual data transfer */
3827 ata_data_xfer(ap, buf + offset, count, do_write);
3829 kunmap_atomic(buf, KM_IRQ0);
3830 local_irq_restore(flags);
3832 buf = page_address(page);
3833 ata_data_xfer(ap, buf + offset, count, do_write);
3837 qc->curbytes += count;
3838 qc->cursg_ofs += count;
3840 if (qc->cursg_ofs == sg->length) {
3850 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3851 * @qc: Command on going
3853 * Transfer Transfer data from/to the ATAPI device.
3856 * Inherited from caller.
3859 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3861 struct ata_port *ap = qc->ap;
3862 struct ata_device *dev = qc->dev;
3863 unsigned int ireason, bc_lo, bc_hi, bytes;
3864 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3866 ap->ops->tf_read(ap, &qc->tf);
3867 ireason = qc->tf.nsect;
3868 bc_lo = qc->tf.lbam;
3869 bc_hi = qc->tf.lbah;
3870 bytes = (bc_hi << 8) | bc_lo;
3872 /* shall be cleared to zero, indicating xfer of data */
3873 if (ireason & (1 << 0))
3876 /* make sure transfer direction matches expected */
3877 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3878 if (do_write != i_write)
3881 VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);
3883 __atapi_pio_bytes(qc, bytes);
3888 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
3889 qc->err_mask |= AC_ERR_HSM;
3890 ap->hsm_task_state = HSM_ST_ERR;
3894 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3895 * @ap: the target ata_port
3899 * 1 if ok in workqueue, 0 otherwise.
3902 static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
3904 if (qc->tf.flags & ATA_TFLAG_POLLING)
3907 if (ap->hsm_task_state == HSM_ST_FIRST) {
3908 if (qc->tf.protocol == ATA_PROT_PIO &&
3909 (qc->tf.flags & ATA_TFLAG_WRITE))
3912 if (is_atapi_taskfile(&qc->tf) &&
3913 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
3921 * ata_hsm_move - move the HSM to the next state.
3922 * @ap: the target ata_port
3924 * @status: current device status
3925 * @in_wq: 1 if called from workqueue, 0 otherwise
3928 * 1 when poll next status needed, 0 otherwise.
3931 static int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
3932 u8 status, int in_wq)
3934 unsigned long flags = 0;
3937 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
3939 /* Make sure ata_qc_issue_prot() does not throw things
3940 * like DMA polling into the workqueue. Notice that
3941 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
3943 WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
3946 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
3947 ap->id, qc->tf.protocol, ap->hsm_task_state, status);
3949 switch (ap->hsm_task_state) {
3951 /* Send first data block or PACKET CDB */
3953 /* If polling, we will stay in the work queue after
3954 * sending the data. Otherwise, interrupt handler
3955 * takes over after sending the data.
3957 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
3959 /* check device status */
3960 if (unlikely((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ)) {
3961 /* Wrong status. Let EH handle this */
3962 qc->err_mask |= AC_ERR_HSM;
3963 ap->hsm_task_state = HSM_ST_ERR;
3967 /* Device should not ask for data transfer (DRQ=1)
3968 * when it finds something wrong.
3969 * We ignore DRQ here and stop the HSM by
3970 * changing hsm_task_state to HSM_ST_ERR and
3971 * let the EH abort the command or reset the device.
3973 if (unlikely(status & (ATA_ERR | ATA_DF))) {
3974 printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
3976 qc->err_mask |= AC_ERR_DEV;
3977 ap->hsm_task_state = HSM_ST_ERR;
3981 /* Send the CDB (atapi) or the first data block (ata pio out).
3982 * During the state transition, interrupt handler shouldn't
3983 * be invoked before the data transfer is complete and
3984 * hsm_task_state is changed. Hence, the following locking.
3987 spin_lock_irqsave(&ap->host_set->lock, flags);
3989 if (qc->tf.protocol == ATA_PROT_PIO) {
3990 /* PIO data out protocol.
3991 * send first data block.
3994 /* ata_pio_sectors() might change the state
3995 * to HSM_ST_LAST. so, the state is changed here
3996 * before ata_pio_sectors().
3998 ap->hsm_task_state = HSM_ST;
3999 ata_pio_sectors(qc);
4000 ata_altstatus(ap); /* flush */
4003 atapi_send_cdb(ap, qc);
4006 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4008 /* if polling, ata_pio_task() handles the rest.
4009 * otherwise, interrupt handler takes over from here.
4014 /* complete command or read/write the data register */
4015 if (qc->tf.protocol == ATA_PROT_ATAPI) {
4016 /* ATAPI PIO protocol */
4017 if ((status & ATA_DRQ) == 0) {
4018 /* no more data to transfer */
4019 ap->hsm_task_state = HSM_ST_LAST;
4023 /* Device should not ask for data transfer (DRQ=1)
4024 * when it finds something wrong.
4025 * We ignore DRQ here and stop the HSM by
4026 * changing hsm_task_state to HSM_ST_ERR and
4027 * let the EH abort the command or reset the device.
4029 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4030 printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4032 qc->err_mask |= AC_ERR_DEV;
4033 ap->hsm_task_state = HSM_ST_ERR;
4037 atapi_pio_bytes(qc);
4039 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
4040 /* bad ireason reported by device */
4044 /* ATA PIO protocol */
4045 if (unlikely((status & ATA_DRQ) == 0)) {
4046 /* handle BSY=0, DRQ=0 as error */
4047 qc->err_mask |= AC_ERR_HSM;
4048 ap->hsm_task_state = HSM_ST_ERR;
4052 /* For PIO reads, some devices may ask for
4053 * data transfer (DRQ=1) alone with ERR=1.
4054 * We respect DRQ here and transfer one
4055 * block of junk data before changing the
4056 * hsm_task_state to HSM_ST_ERR.
4058 * For PIO writes, ERR=1 DRQ=1 doesn't make
4059 * sense since the data block has been
4060 * transferred to the device.
4062 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4063 /* data might be corrputed */
4064 qc->err_mask |= AC_ERR_DEV;
4066 if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
4067 ata_pio_sectors(qc);
4069 status = ata_wait_idle(ap);
4072 /* ata_pio_sectors() might change the
4073 * state to HSM_ST_LAST. so, the state
4074 * is changed after ata_pio_sectors().
4076 ap->hsm_task_state = HSM_ST_ERR;
4080 ata_pio_sectors(qc);
4082 if (ap->hsm_task_state == HSM_ST_LAST &&
4083 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
4086 status = ata_wait_idle(ap);
4091 ata_altstatus(ap); /* flush */
4096 if (unlikely(!ata_ok(status))) {
4097 qc->err_mask |= __ac_err_mask(status);
4098 ap->hsm_task_state = HSM_ST_ERR;
4102 /* no more data to transfer */
4103 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4104 ap->id, qc->dev->devno, status);
4106 WARN_ON(qc->err_mask);
4108 ap->hsm_task_state = HSM_ST_IDLE;
4110 /* complete taskfile transaction */
4112 ata_poll_qc_complete(qc);
4114 ata_qc_complete(qc);
4120 if (qc->tf.command != ATA_CMD_PACKET)
4121 printk(KERN_ERR "ata%u: dev %u command error, drv_stat 0x%x\n",
4122 ap->id, qc->dev->devno, status);
4124 /* make sure qc->err_mask is available to
4125 * know what's wrong and recover
4127 WARN_ON(qc->err_mask == 0);
4129 ap->hsm_task_state = HSM_ST_IDLE;
4131 /* complete taskfile transaction */
4133 ata_poll_qc_complete(qc);
4135 ata_qc_complete(qc);
4147 static void ata_pio_task(void *_data)
4149 struct ata_queued_cmd *qc = _data;
4150 struct ata_port *ap = qc->ap;
4155 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4158 * This is purely heuristic. This is a fast path.
4159 * Sometimes when we enter, BSY will be cleared in
4160 * a chk-status or two. If not, the drive is probably seeking
4161 * or something. Snooze for a couple msecs, then
4162 * chk-status again. If still busy, queue delayed work.
4164 status = ata_busy_wait(ap, ATA_BUSY, 5);
4165 if (status & ATA_BUSY) {
4167 status = ata_busy_wait(ap, ATA_BUSY, 10);
4168 if (status & ATA_BUSY) {
4169 ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4175 poll_next = ata_hsm_move(ap, qc, status, 1);
4177 /* another command or interrupt handler
4178 * may be running at this point.
4185 * ata_qc_new - Request an available ATA command, for queueing
4186 * @ap: Port associated with device @dev
4187 * @dev: Device from whom we request an available command structure
4193 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4195 struct ata_queued_cmd *qc = NULL;
4198 /* no command while frozen */
4199 if (unlikely(ap->flags & ATA_FLAG_FROZEN))
4202 /* the last tag is reserved for internal command. */
4203 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4204 if (!test_and_set_bit(i, &ap->qactive)) {
4205 qc = __ata_qc_from_tag(ap, i);
4216 * ata_qc_new_init - Request an available ATA command, and initialize it
4217 * @dev: Device from whom we request an available command structure
4223 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
4225 struct ata_port *ap = dev->ap;
4226 struct ata_queued_cmd *qc;
4228 qc = ata_qc_new(ap);
4241 * ata_qc_free - free unused ata_queued_cmd
4242 * @qc: Command to complete
4244 * Designed to free unused ata_queued_cmd object
4245 * in case something prevents using it.
4248 * spin_lock_irqsave(host_set lock)
4250 void ata_qc_free(struct ata_queued_cmd *qc)
4252 struct ata_port *ap = qc->ap;
4255 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4259 if (likely(ata_tag_valid(tag))) {
4260 qc->tag = ATA_TAG_POISON;
4261 clear_bit(tag, &ap->qactive);
4265 void __ata_qc_complete(struct ata_queued_cmd *qc)
4267 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4268 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4270 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4273 /* command should be marked inactive atomically with qc completion */
4274 qc->ap->active_tag = ATA_TAG_POISON;
4276 /* atapi: mark qc as inactive to prevent the interrupt handler
4277 * from completing the command twice later, before the error handler
4278 * is called. (when rc != 0 and atapi request sense is needed)
4280 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4282 /* call completion callback */
4283 qc->complete_fn(qc);
4287 * ata_qc_complete - Complete an active ATA command
4288 * @qc: Command to complete
4289 * @err_mask: ATA Status register contents
4291 * Indicate to the mid and upper layers that an ATA
4292 * command has completed, with either an ok or not-ok status.
4295 * spin_lock_irqsave(host_set lock)
4297 void ata_qc_complete(struct ata_queued_cmd *qc)
4299 struct ata_port *ap = qc->ap;
4301 /* XXX: New EH and old EH use different mechanisms to
4302 * synchronize EH with regular execution path.
4304 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4305 * Normal execution path is responsible for not accessing a
4306 * failed qc. libata core enforces the rule by returning NULL
4307 * from ata_qc_from_tag() for failed qcs.
4309 * Old EH depends on ata_qc_complete() nullifying completion
4310 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4311 * not synchronize with interrupt handler. Only PIO task is
4314 if (ap->ops->error_handler) {
4315 WARN_ON(ap->flags & ATA_FLAG_FROZEN);
4317 if (unlikely(qc->err_mask))
4318 qc->flags |= ATA_QCFLAG_FAILED;
4320 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4321 if (!ata_tag_internal(qc->tag)) {
4322 /* always fill result TF for failed qc */
4323 ap->ops->tf_read(ap, &qc->result_tf);
4324 ata_qc_schedule_eh(qc);
4329 /* read result TF if requested */
4330 if (qc->flags & ATA_QCFLAG_RESULT_TF)
4331 ap->ops->tf_read(ap, &qc->result_tf);
4333 __ata_qc_complete(qc);
4335 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4338 /* read result TF if failed or requested */
4339 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4340 ap->ops->tf_read(ap, &qc->result_tf);
4342 __ata_qc_complete(qc);
4346 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4348 struct ata_port *ap = qc->ap;
4350 switch (qc->tf.protocol) {
4352 case ATA_PROT_ATAPI_DMA:
4355 case ATA_PROT_ATAPI:
4357 if (ap->flags & ATA_FLAG_PIO_DMA)
4370 * ata_qc_issue - issue taskfile to device
4371 * @qc: command to issue to device
4373 * Prepare an ATA command to submission to device.
4374 * This includes mapping the data into a DMA-able
4375 * area, filling in the S/G table, and finally
4376 * writing the taskfile to hardware, starting the command.
4379 * spin_lock_irqsave(host_set lock)
4381 void ata_qc_issue(struct ata_queued_cmd *qc)
4383 struct ata_port *ap = qc->ap;
4385 qc->ap->active_tag = qc->tag;
4386 qc->flags |= ATA_QCFLAG_ACTIVE;
4388 if (ata_should_dma_map(qc)) {
4389 if (qc->flags & ATA_QCFLAG_SG) {
4390 if (ata_sg_setup(qc))
4392 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4393 if (ata_sg_setup_one(qc))
4397 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4400 ap->ops->qc_prep(qc);
4402 qc->err_mask |= ap->ops->qc_issue(qc);
4403 if (unlikely(qc->err_mask))
4408 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4409 qc->err_mask |= AC_ERR_SYSTEM;
4411 ata_qc_complete(qc);
4415 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4416 * @qc: command to issue to device
4418 * Using various libata functions and hooks, this function
4419 * starts an ATA command. ATA commands are grouped into
4420 * classes called "protocols", and issuing each type of protocol
4421 * is slightly different.
4423 * May be used as the qc_issue() entry in ata_port_operations.
4426 * spin_lock_irqsave(host_set lock)
4429 * Zero on success, AC_ERR_* mask on failure
4432 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4434 struct ata_port *ap = qc->ap;
4436 /* Use polling pio if the LLD doesn't handle
4437 * interrupt driven pio and atapi CDB interrupt.
4439 if (ap->flags & ATA_FLAG_PIO_POLLING) {
4440 switch (qc->tf.protocol) {
4442 case ATA_PROT_ATAPI:
4443 case ATA_PROT_ATAPI_NODATA:
4444 qc->tf.flags |= ATA_TFLAG_POLLING;
4446 case ATA_PROT_ATAPI_DMA:
4447 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
4448 /* see ata_check_atapi_dma() */
4456 /* select the device */
4457 ata_dev_select(ap, qc->dev->devno, 1, 0);
4459 /* start the command */
4460 switch (qc->tf.protocol) {
4461 case ATA_PROT_NODATA:
4462 if (qc->tf.flags & ATA_TFLAG_POLLING)
4463 ata_qc_set_polling(qc);
4465 ata_tf_to_host(ap, &qc->tf);
4466 ap->hsm_task_state = HSM_ST_LAST;
4468 if (qc->tf.flags & ATA_TFLAG_POLLING)
4469 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4474 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4476 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4477 ap->ops->bmdma_setup(qc); /* set up bmdma */
4478 ap->ops->bmdma_start(qc); /* initiate bmdma */
4479 ap->hsm_task_state = HSM_ST_LAST;
4483 if (qc->tf.flags & ATA_TFLAG_POLLING)
4484 ata_qc_set_polling(qc);
4486 ata_tf_to_host(ap, &qc->tf);
4488 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4489 /* PIO data out protocol */
4490 ap->hsm_task_state = HSM_ST_FIRST;
4491 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4493 /* always send first data block using
4494 * the ata_pio_task() codepath.
4497 /* PIO data in protocol */
4498 ap->hsm_task_state = HSM_ST;
4500 if (qc->tf.flags & ATA_TFLAG_POLLING)
4501 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4503 /* if polling, ata_pio_task() handles the rest.
4504 * otherwise, interrupt handler takes over from here.
4510 case ATA_PROT_ATAPI:
4511 case ATA_PROT_ATAPI_NODATA:
4512 if (qc->tf.flags & ATA_TFLAG_POLLING)
4513 ata_qc_set_polling(qc);
4515 ata_tf_to_host(ap, &qc->tf);
4517 ap->hsm_task_state = HSM_ST_FIRST;
4519 /* send cdb by polling if no cdb interrupt */
4520 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
4521 (qc->tf.flags & ATA_TFLAG_POLLING))
4522 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4525 case ATA_PROT_ATAPI_DMA:
4526 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4528 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4529 ap->ops->bmdma_setup(qc); /* set up bmdma */
4530 ap->hsm_task_state = HSM_ST_FIRST;
4532 /* send cdb by polling if no cdb interrupt */
4533 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4534 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4539 return AC_ERR_SYSTEM;
4546 * ata_host_intr - Handle host interrupt for given (port, task)
4547 * @ap: Port on which interrupt arrived (possibly...)
4548 * @qc: Taskfile currently active in engine
4550 * Handle host interrupt for given queued command. Currently,
4551 * only DMA interrupts are handled. All other commands are
4552 * handled via polling with interrupts disabled (nIEN bit).
4555 * spin_lock_irqsave(host_set lock)
4558 * One if interrupt was handled, zero if not (shared irq).
4561 inline unsigned int ata_host_intr (struct ata_port *ap,
4562 struct ata_queued_cmd *qc)
4564 u8 status, host_stat = 0;
4566 VPRINTK("ata%u: protocol %d task_state %d\n",
4567 ap->id, qc->tf.protocol, ap->hsm_task_state);
4569 /* Check whether we are expecting interrupt in this state */
4570 switch (ap->hsm_task_state) {
4572 /* Some pre-ATAPI-4 devices assert INTRQ
4573 * at this state when ready to receive CDB.
4576 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4577 * The flag was turned on only for atapi devices.
4578 * No need to check is_atapi_taskfile(&qc->tf) again.
4580 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4584 if (qc->tf.protocol == ATA_PROT_DMA ||
4585 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
4586 /* check status of DMA engine */
4587 host_stat = ap->ops->bmdma_status(ap);
4588 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4590 /* if it's not our irq... */
4591 if (!(host_stat & ATA_DMA_INTR))
4594 /* before we do anything else, clear DMA-Start bit */
4595 ap->ops->bmdma_stop(qc);
4597 if (unlikely(host_stat & ATA_DMA_ERR)) {
4598 /* error when transfering data to/from memory */
4599 qc->err_mask |= AC_ERR_HOST_BUS;
4600 ap->hsm_task_state = HSM_ST_ERR;
4610 /* check altstatus */
4611 status = ata_altstatus(ap);
4612 if (status & ATA_BUSY)
4615 /* check main status, clearing INTRQ */
4616 status = ata_chk_status(ap);
4617 if (unlikely(status & ATA_BUSY))
4620 /* ack bmdma irq events */
4621 ap->ops->irq_clear(ap);
4623 ata_hsm_move(ap, qc, status, 0);
4624 return 1; /* irq handled */
4627 ap->stats.idle_irq++;
4630 if ((ap->stats.idle_irq % 1000) == 0) {
4631 ata_irq_ack(ap, 0); /* debug trap */
4632 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
4636 return 0; /* irq not handled */
4640 * ata_interrupt - Default ATA host interrupt handler
4641 * @irq: irq line (unused)
4642 * @dev_instance: pointer to our ata_host_set information structure
4645 * Default interrupt handler for PCI IDE devices. Calls
4646 * ata_host_intr() for each port that is not disabled.
4649 * Obtains host_set lock during operation.
4652 * IRQ_NONE or IRQ_HANDLED.
4655 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4657 struct ata_host_set *host_set = dev_instance;
4659 unsigned int handled = 0;
4660 unsigned long flags;
4662 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4663 spin_lock_irqsave(&host_set->lock, flags);
4665 for (i = 0; i < host_set->n_ports; i++) {
4666 struct ata_port *ap;
4668 ap = host_set->ports[i];
4670 !(ap->flags & ATA_FLAG_DISABLED)) {
4671 struct ata_queued_cmd *qc;
4673 qc = ata_qc_from_tag(ap, ap->active_tag);
4674 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
4675 (qc->flags & ATA_QCFLAG_ACTIVE))
4676 handled |= ata_host_intr(ap, qc);
4680 spin_unlock_irqrestore(&host_set->lock, flags);
4682 return IRQ_RETVAL(handled);
4686 * sata_scr_valid - test whether SCRs are accessible
4687 * @ap: ATA port to test SCR accessibility for
4689 * Test whether SCRs are accessible for @ap.
4695 * 1 if SCRs are accessible, 0 otherwise.
4697 int sata_scr_valid(struct ata_port *ap)
4699 return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
4703 * sata_scr_read - read SCR register of the specified port
4704 * @ap: ATA port to read SCR for
4706 * @val: Place to store read value
4708 * Read SCR register @reg of @ap into *@val. This function is
4709 * guaranteed to succeed if the cable type of the port is SATA
4710 * and the port implements ->scr_read.
4716 * 0 on success, negative errno on failure.
4718 int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
4720 if (sata_scr_valid(ap)) {
4721 *val = ap->ops->scr_read(ap, reg);
4728 * sata_scr_write - write SCR register of the specified port
4729 * @ap: ATA port to write SCR for
4730 * @reg: SCR to write
4731 * @val: value to write
4733 * Write @val to SCR register @reg of @ap. This function is
4734 * guaranteed to succeed if the cable type of the port is SATA
4735 * and the port implements ->scr_read.
4741 * 0 on success, negative errno on failure.
4743 int sata_scr_write(struct ata_port *ap, int reg, u32 val)
4745 if (sata_scr_valid(ap)) {
4746 ap->ops->scr_write(ap, reg, val);
4753 * sata_scr_write_flush - write SCR register of the specified port and flush
4754 * @ap: ATA port to write SCR for
4755 * @reg: SCR to write
4756 * @val: value to write
4758 * This function is identical to sata_scr_write() except that this
4759 * function performs flush after writing to the register.
4765 * 0 on success, negative errno on failure.
4767 int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
4769 if (sata_scr_valid(ap)) {
4770 ap->ops->scr_write(ap, reg, val);
4771 ap->ops->scr_read(ap, reg);
4778 * ata_port_online - test whether the given port is online
4779 * @ap: ATA port to test
4781 * Test whether @ap is online. Note that this function returns 0
4782 * if online status of @ap cannot be obtained, so
4783 * ata_port_online(ap) != !ata_port_offline(ap).
4789 * 1 if the port online status is available and online.
4791 int ata_port_online(struct ata_port *ap)
4795 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
4801 * ata_port_offline - test whether the given port is offline
4802 * @ap: ATA port to test
4804 * Test whether @ap is offline. Note that this function returns
4805 * 0 if offline status of @ap cannot be obtained, so
4806 * ata_port_online(ap) != !ata_port_offline(ap).
4812 * 1 if the port offline status is available and offline.
4814 int ata_port_offline(struct ata_port *ap)
4818 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
4824 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4825 * without filling any other registers
4827 static int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
4829 struct ata_taskfile tf;
4832 ata_tf_init(dev, &tf);
4835 tf.flags |= ATA_TFLAG_DEVICE;
4836 tf.protocol = ATA_PROT_NODATA;
4838 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4840 ata_dev_printk(dev, KERN_ERR, "%s: ata command failed: %d\n",
4846 static int ata_flush_cache(struct ata_device *dev)
4850 if (!ata_try_flush_cache(dev))
4853 if (ata_id_has_flush_ext(dev->id))
4854 cmd = ATA_CMD_FLUSH_EXT;
4856 cmd = ATA_CMD_FLUSH;
4858 return ata_do_simple_cmd(dev, cmd);
4861 static int ata_standby_drive(struct ata_device *dev)
4863 return ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1);
4866 static int ata_start_drive(struct ata_device *dev)
4868 return ata_do_simple_cmd(dev, ATA_CMD_IDLEIMMEDIATE);
4872 * ata_device_resume - wakeup a previously suspended devices
4873 * @dev: the device to resume
4875 * Kick the drive back into action, by sending it an idle immediate
4876 * command and making sure its transfer mode matches between drive
4880 int ata_device_resume(struct ata_device *dev)
4882 struct ata_port *ap = dev->ap;
4884 if (ap->flags & ATA_FLAG_SUSPENDED) {
4885 struct ata_device *failed_dev;
4886 ap->flags &= ~ATA_FLAG_SUSPENDED;
4887 while (ata_set_mode(ap, &failed_dev))
4888 ata_dev_disable(failed_dev);
4890 if (!ata_dev_enabled(dev))
4892 if (dev->class == ATA_DEV_ATA)
4893 ata_start_drive(dev);
4899 * ata_device_suspend - prepare a device for suspend
4900 * @dev: the device to suspend
4902 * Flush the cache on the drive, if appropriate, then issue a
4903 * standbynow command.
4905 int ata_device_suspend(struct ata_device *dev, pm_message_t state)
4907 struct ata_port *ap = dev->ap;
4909 if (!ata_dev_enabled(dev))
4911 if (dev->class == ATA_DEV_ATA)
4912 ata_flush_cache(dev);
4914 if (state.event != PM_EVENT_FREEZE)
4915 ata_standby_drive(dev);
4916 ap->flags |= ATA_FLAG_SUSPENDED;
4921 * ata_port_start - Set port up for dma.
4922 * @ap: Port to initialize
4924 * Called just after data structures for each port are
4925 * initialized. Allocates space for PRD table.
4927 * May be used as the port_start() entry in ata_port_operations.
4930 * Inherited from caller.
4933 int ata_port_start (struct ata_port *ap)
4935 struct device *dev = ap->dev;
4938 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4942 rc = ata_pad_alloc(ap, dev);
4944 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4948 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4955 * ata_port_stop - Undo ata_port_start()
4956 * @ap: Port to shut down
4958 * Frees the PRD table.
4960 * May be used as the port_stop() entry in ata_port_operations.
4963 * Inherited from caller.
4966 void ata_port_stop (struct ata_port *ap)
4968 struct device *dev = ap->dev;
4970 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4971 ata_pad_free(ap, dev);
4974 void ata_host_stop (struct ata_host_set *host_set)
4976 if (host_set->mmio_base)
4977 iounmap(host_set->mmio_base);
4982 * ata_host_remove - Unregister SCSI host structure with upper layers
4983 * @ap: Port to unregister
4984 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4987 * Inherited from caller.
4990 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4992 struct Scsi_Host *sh = ap->host;
4997 scsi_remove_host(sh);
4999 ap->ops->port_stop(ap);
5003 * ata_host_init - Initialize an ata_port structure
5004 * @ap: Structure to initialize
5005 * @host: associated SCSI mid-layer structure
5006 * @host_set: Collection of hosts to which @ap belongs
5007 * @ent: Probe information provided by low-level driver
5008 * @port_no: Port number associated with this ata_port
5010 * Initialize a new ata_port structure, and its associated
5014 * Inherited from caller.
5017 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
5018 struct ata_host_set *host_set,
5019 const struct ata_probe_ent *ent, unsigned int port_no)
5025 host->max_channel = 1;
5026 host->unique_id = ata_unique_id++;
5027 host->max_cmd_len = 12;
5029 ap->flags = ATA_FLAG_DISABLED;
5030 ap->id = host->unique_id;
5032 ap->ctl = ATA_DEVCTL_OBS;
5033 ap->host_set = host_set;
5035 ap->port_no = port_no;
5037 ent->legacy_mode ? ent->hard_port_no : port_no;
5038 ap->pio_mask = ent->pio_mask;
5039 ap->mwdma_mask = ent->mwdma_mask;
5040 ap->udma_mask = ent->udma_mask;
5041 ap->flags |= ent->host_flags;
5042 ap->ops = ent->port_ops;
5043 ap->sata_spd_limit = UINT_MAX;
5044 ap->active_tag = ATA_TAG_POISON;
5045 ap->last_ctl = 0xFF;
5047 INIT_WORK(&ap->port_task, NULL, NULL);
5048 INIT_LIST_HEAD(&ap->eh_done_q);
5050 /* set cable type */
5051 ap->cbl = ATA_CBL_NONE;
5052 if (ap->flags & ATA_FLAG_SATA)
5053 ap->cbl = ATA_CBL_SATA;
5055 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5056 struct ata_device *dev = &ap->device[i];
5059 dev->pio_mask = UINT_MAX;
5060 dev->mwdma_mask = UINT_MAX;
5061 dev->udma_mask = UINT_MAX;
5065 ap->stats.unhandled_irq = 1;
5066 ap->stats.idle_irq = 1;
5069 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
5073 * ata_host_add - Attach low-level ATA driver to system
5074 * @ent: Information provided by low-level driver
5075 * @host_set: Collections of ports to which we add
5076 * @port_no: Port number associated with this host
5078 * Attach low-level ATA driver to system.
5081 * PCI/etc. bus probe sem.
5084 * New ata_port on success, for NULL on error.
5087 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
5088 struct ata_host_set *host_set,
5089 unsigned int port_no)
5091 struct Scsi_Host *host;
5092 struct ata_port *ap;
5097 if (!ent->port_ops->probe_reset &&
5098 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
5099 printk(KERN_ERR "ata%u: no reset mechanism available\n",
5104 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
5108 host->transportt = &ata_scsi_transport_template;
5110 ap = ata_shost_to_port(host);
5112 ata_host_init(ap, host, host_set, ent, port_no);
5114 rc = ap->ops->port_start(ap);
5121 scsi_host_put(host);
5126 * ata_device_add - Register hardware device with ATA and SCSI layers
5127 * @ent: Probe information describing hardware device to be registered
5129 * This function processes the information provided in the probe
5130 * information struct @ent, allocates the necessary ATA and SCSI
5131 * host information structures, initializes them, and registers
5132 * everything with requisite kernel subsystems.
5134 * This function requests irqs, probes the ATA bus, and probes
5138 * PCI/etc. bus probe sem.
5141 * Number of ports registered. Zero on error (no ports registered).
5144 int ata_device_add(const struct ata_probe_ent *ent)
5146 unsigned int count = 0, i;
5147 struct device *dev = ent->dev;
5148 struct ata_host_set *host_set;
5151 /* alloc a container for our list of ATA ports (buses) */
5152 host_set = kzalloc(sizeof(struct ata_host_set) +
5153 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
5156 spin_lock_init(&host_set->lock);
5158 host_set->dev = dev;
5159 host_set->n_ports = ent->n_ports;
5160 host_set->irq = ent->irq;
5161 host_set->mmio_base = ent->mmio_base;
5162 host_set->private_data = ent->private_data;
5163 host_set->ops = ent->port_ops;
5164 host_set->flags = ent->host_set_flags;
5166 /* register each port bound to this device */
5167 for (i = 0; i < ent->n_ports; i++) {
5168 struct ata_port *ap;
5169 unsigned long xfer_mode_mask;
5171 ap = ata_host_add(ent, host_set, i);
5175 host_set->ports[i] = ap;
5176 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
5177 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
5178 (ap->pio_mask << ATA_SHIFT_PIO);
5180 /* print per-port info to dmesg */
5181 ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%lX "
5182 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
5183 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
5184 ata_mode_string(xfer_mode_mask),
5185 ap->ioaddr.cmd_addr,
5186 ap->ioaddr.ctl_addr,
5187 ap->ioaddr.bmdma_addr,
5191 host_set->ops->irq_clear(ap);
5192 ata_eh_freeze_port(ap); /* freeze port before requesting IRQ */
5199 /* obtain irq, that is shared between channels */
5200 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
5201 DRV_NAME, host_set))
5204 /* perform each probe synchronously */
5205 DPRINTK("probe begin\n");
5206 for (i = 0; i < count; i++) {
5207 struct ata_port *ap;
5210 ap = host_set->ports[i];
5212 DPRINTK("ata%u: bus probe begin\n", ap->id);
5213 rc = ata_bus_probe(ap);
5214 DPRINTK("ata%u: bus probe end\n", ap->id);
5217 /* FIXME: do something useful here?
5218 * Current libata behavior will
5219 * tear down everything when
5220 * the module is removed
5221 * or the h/w is unplugged.
5225 rc = scsi_add_host(ap->host, dev);
5227 ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
5228 /* FIXME: do something useful here */
5229 /* FIXME: handle unconditional calls to
5230 * scsi_scan_host and ata_host_remove, below,
5236 /* probes are done, now scan each port's disk(s) */
5237 DPRINTK("host probe begin\n");
5238 for (i = 0; i < count; i++) {
5239 struct ata_port *ap = host_set->ports[i];
5241 ata_scsi_scan_host(ap);
5244 dev_set_drvdata(dev, host_set);
5246 VPRINTK("EXIT, returning %u\n", ent->n_ports);
5247 return ent->n_ports; /* success */
5250 for (i = 0; i < count; i++) {
5251 ata_host_remove(host_set->ports[i], 1);
5252 scsi_host_put(host_set->ports[i]->host);
5256 VPRINTK("EXIT, returning 0\n");
5261 * ata_host_set_remove - PCI layer callback for device removal
5262 * @host_set: ATA host set that was removed
5264 * Unregister all objects associated with this host set. Free those
5268 * Inherited from calling layer (may sleep).
5271 void ata_host_set_remove(struct ata_host_set *host_set)
5273 struct ata_port *ap;
5276 for (i = 0; i < host_set->n_ports; i++) {
5277 ap = host_set->ports[i];
5278 scsi_remove_host(ap->host);
5281 free_irq(host_set->irq, host_set);
5283 for (i = 0; i < host_set->n_ports; i++) {
5284 ap = host_set->ports[i];
5286 ata_scsi_release(ap->host);
5288 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
5289 struct ata_ioports *ioaddr = &ap->ioaddr;
5291 if (ioaddr->cmd_addr == 0x1f0)
5292 release_region(0x1f0, 8);
5293 else if (ioaddr->cmd_addr == 0x170)
5294 release_region(0x170, 8);
5297 scsi_host_put(ap->host);
5300 if (host_set->ops->host_stop)
5301 host_set->ops->host_stop(host_set);
5307 * ata_scsi_release - SCSI layer callback hook for host unload
5308 * @host: libata host to be unloaded
5310 * Performs all duties necessary to shut down a libata port...
5311 * Kill port kthread, disable port, and release resources.
5314 * Inherited from SCSI layer.
5320 int ata_scsi_release(struct Scsi_Host *host)
5322 struct ata_port *ap = ata_shost_to_port(host);
5326 ap->ops->port_disable(ap);
5327 ata_host_remove(ap, 0);
5334 * ata_std_ports - initialize ioaddr with standard port offsets.
5335 * @ioaddr: IO address structure to be initialized
5337 * Utility function which initializes data_addr, error_addr,
5338 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5339 * device_addr, status_addr, and command_addr to standard offsets
5340 * relative to cmd_addr.
5342 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5345 void ata_std_ports(struct ata_ioports *ioaddr)
5347 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
5348 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
5349 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
5350 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
5351 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
5352 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
5353 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
5354 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
5355 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
5356 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
5362 void ata_pci_host_stop (struct ata_host_set *host_set)
5364 struct pci_dev *pdev = to_pci_dev(host_set->dev);
5366 pci_iounmap(pdev, host_set->mmio_base);
5370 * ata_pci_remove_one - PCI layer callback for device removal
5371 * @pdev: PCI device that was removed
5373 * PCI layer indicates to libata via this hook that
5374 * hot-unplug or module unload event has occurred.
5375 * Handle this by unregistering all objects associated
5376 * with this PCI device. Free those objects. Then finally
5377 * release PCI resources and disable device.
5380 * Inherited from PCI layer (may sleep).
5383 void ata_pci_remove_one (struct pci_dev *pdev)
5385 struct device *dev = pci_dev_to_dev(pdev);
5386 struct ata_host_set *host_set = dev_get_drvdata(dev);
5388 ata_host_set_remove(host_set);
5389 pci_release_regions(pdev);
5390 pci_disable_device(pdev);
5391 dev_set_drvdata(dev, NULL);
5394 /* move to PCI subsystem */
5395 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
5397 unsigned long tmp = 0;
5399 switch (bits->width) {
5402 pci_read_config_byte(pdev, bits->reg, &tmp8);
5408 pci_read_config_word(pdev, bits->reg, &tmp16);
5414 pci_read_config_dword(pdev, bits->reg, &tmp32);
5425 return (tmp == bits->val) ? 1 : 0;
5428 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
5430 pci_save_state(pdev);
5431 pci_disable_device(pdev);
5432 pci_set_power_state(pdev, PCI_D3hot);
5436 int ata_pci_device_resume(struct pci_dev *pdev)
5438 pci_set_power_state(pdev, PCI_D0);
5439 pci_restore_state(pdev);
5440 pci_enable_device(pdev);
5441 pci_set_master(pdev);
5444 #endif /* CONFIG_PCI */
5447 static int __init ata_init(void)
5449 ata_wq = create_workqueue("ata");
5453 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5457 static void __exit ata_exit(void)
5459 destroy_workqueue(ata_wq);
5462 module_init(ata_init);
5463 module_exit(ata_exit);
5465 static unsigned long ratelimit_time;
5466 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5468 int ata_ratelimit(void)
5471 unsigned long flags;
5473 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5475 if (time_after(jiffies, ratelimit_time)) {
5477 ratelimit_time = jiffies + (HZ/5);
5481 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5487 * ata_wait_register - wait until register value changes
5488 * @reg: IO-mapped register
5489 * @mask: Mask to apply to read register value
5490 * @val: Wait condition
5491 * @interval_msec: polling interval in milliseconds
5492 * @timeout_msec: timeout in milliseconds
5494 * Waiting for some bits of register to change is a common
5495 * operation for ATA controllers. This function reads 32bit LE
5496 * IO-mapped register @reg and tests for the following condition.
5498 * (*@reg & mask) != val
5500 * If the condition is met, it returns; otherwise, the process is
5501 * repeated after @interval_msec until timeout.
5504 * Kernel thread context (may sleep)
5507 * The final register value.
5509 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
5510 unsigned long interval_msec,
5511 unsigned long timeout_msec)
5513 unsigned long timeout;
5516 tmp = ioread32(reg);
5518 /* Calculate timeout _after_ the first read to make sure
5519 * preceding writes reach the controller before starting to
5520 * eat away the timeout.
5522 timeout = jiffies + (timeout_msec * HZ) / 1000;
5524 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
5525 msleep(interval_msec);
5526 tmp = ioread32(reg);
5533 * libata is essentially a library of internal helper functions for
5534 * low-level ATA host controller drivers. As such, the API/ABI is
5535 * likely to change as new drivers are added and updated.
5536 * Do not depend on ABI/API stability.
5539 EXPORT_SYMBOL_GPL(ata_std_bios_param);
5540 EXPORT_SYMBOL_GPL(ata_std_ports);
5541 EXPORT_SYMBOL_GPL(ata_device_add);
5542 EXPORT_SYMBOL_GPL(ata_host_set_remove);
5543 EXPORT_SYMBOL_GPL(ata_sg_init);
5544 EXPORT_SYMBOL_GPL(ata_sg_init_one);
5545 EXPORT_SYMBOL_GPL(ata_qc_complete);
5546 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
5547 EXPORT_SYMBOL_GPL(ata_tf_load);
5548 EXPORT_SYMBOL_GPL(ata_tf_read);
5549 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5550 EXPORT_SYMBOL_GPL(ata_std_dev_select);
5551 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5552 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5553 EXPORT_SYMBOL_GPL(ata_check_status);
5554 EXPORT_SYMBOL_GPL(ata_altstatus);
5555 EXPORT_SYMBOL_GPL(ata_exec_command);
5556 EXPORT_SYMBOL_GPL(ata_port_start);
5557 EXPORT_SYMBOL_GPL(ata_port_stop);
5558 EXPORT_SYMBOL_GPL(ata_host_stop);
5559 EXPORT_SYMBOL_GPL(ata_interrupt);
5560 EXPORT_SYMBOL_GPL(ata_qc_prep);
5561 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
5562 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5563 EXPORT_SYMBOL_GPL(ata_bmdma_start);
5564 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5565 EXPORT_SYMBOL_GPL(ata_bmdma_status);
5566 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5567 EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
5568 EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
5569 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
5570 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
5571 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
5572 EXPORT_SYMBOL_GPL(ata_port_probe);
5573 EXPORT_SYMBOL_GPL(sata_set_spd);
5574 EXPORT_SYMBOL_GPL(sata_phy_reset);
5575 EXPORT_SYMBOL_GPL(__sata_phy_reset);
5576 EXPORT_SYMBOL_GPL(ata_bus_reset);
5577 EXPORT_SYMBOL_GPL(ata_std_probeinit);
5578 EXPORT_SYMBOL_GPL(ata_std_softreset);
5579 EXPORT_SYMBOL_GPL(sata_std_hardreset);
5580 EXPORT_SYMBOL_GPL(ata_std_postreset);
5581 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5582 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5583 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
5584 EXPORT_SYMBOL_GPL(ata_dev_classify);
5585 EXPORT_SYMBOL_GPL(ata_dev_pair);
5586 EXPORT_SYMBOL_GPL(ata_port_disable);
5587 EXPORT_SYMBOL_GPL(ata_ratelimit);
5588 EXPORT_SYMBOL_GPL(ata_wait_register);
5589 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5590 EXPORT_SYMBOL_GPL(ata_port_queue_task);
5591 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5592 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5593 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5594 EXPORT_SYMBOL_GPL(ata_scsi_release);
5595 EXPORT_SYMBOL_GPL(ata_host_intr);
5596 EXPORT_SYMBOL_GPL(sata_scr_valid);
5597 EXPORT_SYMBOL_GPL(sata_scr_read);
5598 EXPORT_SYMBOL_GPL(sata_scr_write);
5599 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
5600 EXPORT_SYMBOL_GPL(ata_port_online);
5601 EXPORT_SYMBOL_GPL(ata_port_offline);
5602 EXPORT_SYMBOL_GPL(ata_id_string);
5603 EXPORT_SYMBOL_GPL(ata_id_c_string);
5604 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5606 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5607 EXPORT_SYMBOL_GPL(ata_timing_compute);
5608 EXPORT_SYMBOL_GPL(ata_timing_merge);
5611 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5612 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5613 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5614 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5615 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5616 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5617 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5618 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
5619 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
5620 #endif /* CONFIG_PCI */
5622 EXPORT_SYMBOL_GPL(ata_device_suspend);
5623 EXPORT_SYMBOL_GPL(ata_device_resume);
5624 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5625 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
5627 EXPORT_SYMBOL_GPL(ata_eng_timeout);
5628 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
5629 EXPORT_SYMBOL_GPL(ata_port_abort);
5630 EXPORT_SYMBOL_GPL(ata_port_freeze);
5631 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
5632 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
5633 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5634 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
5635 EXPORT_SYMBOL_GPL(ata_do_eh);