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_port *ap,
65 struct ata_device *dev);
66 static void ata_set_mode(struct ata_port *ap);
67 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
68 struct ata_device *dev);
69 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev);
71 static unsigned int ata_unique_id = 1;
72 static struct workqueue_struct *ata_wq;
74 int atapi_enabled = 1;
75 module_param(atapi_enabled, int, 0444);
76 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
79 module_param_named(fua, libata_fua, int, 0444);
80 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
82 MODULE_AUTHOR("Jeff Garzik");
83 MODULE_DESCRIPTION("Library module for ATA devices");
84 MODULE_LICENSE("GPL");
85 MODULE_VERSION(DRV_VERSION);
89 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
90 * @tf: Taskfile to convert
91 * @fis: Buffer into which data will output
92 * @pmp: Port multiplier port
94 * Converts a standard ATA taskfile to a Serial ATA
95 * FIS structure (Register - Host to Device).
98 * Inherited from caller.
101 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
103 fis[0] = 0x27; /* Register - Host to Device FIS */
104 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
105 bit 7 indicates Command FIS */
106 fis[2] = tf->command;
107 fis[3] = tf->feature;
114 fis[8] = tf->hob_lbal;
115 fis[9] = tf->hob_lbam;
116 fis[10] = tf->hob_lbah;
117 fis[11] = tf->hob_feature;
120 fis[13] = tf->hob_nsect;
131 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
132 * @fis: Buffer from which data will be input
133 * @tf: Taskfile to output
135 * Converts a serial ATA FIS structure to a standard ATA taskfile.
138 * Inherited from caller.
141 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
143 tf->command = fis[2]; /* status */
144 tf->feature = fis[3]; /* error */
151 tf->hob_lbal = fis[8];
152 tf->hob_lbam = fis[9];
153 tf->hob_lbah = fis[10];
156 tf->hob_nsect = fis[13];
159 static const u8 ata_rw_cmds[] = {
163 ATA_CMD_READ_MULTI_EXT,
164 ATA_CMD_WRITE_MULTI_EXT,
168 ATA_CMD_WRITE_MULTI_FUA_EXT,
172 ATA_CMD_PIO_READ_EXT,
173 ATA_CMD_PIO_WRITE_EXT,
186 ATA_CMD_WRITE_FUA_EXT
190 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
191 * @qc: command to examine and configure
193 * Examine the device configuration and tf->flags to calculate
194 * the proper read/write commands and protocol to use.
199 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
201 struct ata_taskfile *tf = &qc->tf;
202 struct ata_device *dev = qc->dev;
205 int index, fua, lba48, write;
207 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
208 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
209 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
211 if (dev->flags & ATA_DFLAG_PIO) {
212 tf->protocol = ATA_PROT_PIO;
213 index = dev->multi_count ? 0 : 8;
214 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
215 /* Unable to use DMA due to host limitation */
216 tf->protocol = ATA_PROT_PIO;
217 index = dev->multi_count ? 0 : 8;
219 tf->protocol = ATA_PROT_DMA;
223 cmd = ata_rw_cmds[index + fua + lba48 + write];
232 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
233 * @pio_mask: pio_mask
234 * @mwdma_mask: mwdma_mask
235 * @udma_mask: udma_mask
237 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
238 * unsigned int xfer_mask.
246 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
247 unsigned int mwdma_mask,
248 unsigned int udma_mask)
250 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
251 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
252 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
256 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
257 * @xfer_mask: xfer_mask to unpack
258 * @pio_mask: resulting pio_mask
259 * @mwdma_mask: resulting mwdma_mask
260 * @udma_mask: resulting udma_mask
262 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
263 * Any NULL distination masks will be ignored.
265 static void ata_unpack_xfermask(unsigned int xfer_mask,
266 unsigned int *pio_mask,
267 unsigned int *mwdma_mask,
268 unsigned int *udma_mask)
271 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
273 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
275 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
278 static const struct ata_xfer_ent {
279 unsigned int shift, bits;
282 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
283 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
284 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
289 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
290 * @xfer_mask: xfer_mask of interest
292 * Return matching XFER_* value for @xfer_mask. Only the highest
293 * bit of @xfer_mask is considered.
299 * Matching XFER_* value, 0 if no match found.
301 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
303 int highbit = fls(xfer_mask) - 1;
304 const struct ata_xfer_ent *ent;
306 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
307 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
308 return ent->base + highbit - ent->shift;
313 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
314 * @xfer_mode: XFER_* of interest
316 * Return matching xfer_mask for @xfer_mode.
322 * Matching xfer_mask, 0 if no match found.
324 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
326 const struct ata_xfer_ent *ent;
328 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
329 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
330 return 1 << (ent->shift + xfer_mode - ent->base);
335 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
336 * @xfer_mode: XFER_* of interest
338 * Return matching xfer_shift for @xfer_mode.
344 * Matching xfer_shift, -1 if no match found.
346 static int ata_xfer_mode2shift(unsigned int xfer_mode)
348 const struct ata_xfer_ent *ent;
350 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
351 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
357 * ata_mode_string - convert xfer_mask to string
358 * @xfer_mask: mask of bits supported; only highest bit counts.
360 * Determine string which represents the highest speed
361 * (highest bit in @modemask).
367 * Constant C string representing highest speed listed in
368 * @mode_mask, or the constant C string "<n/a>".
370 static const char *ata_mode_string(unsigned int xfer_mask)
372 static const char * const xfer_mode_str[] = {
392 highbit = fls(xfer_mask) - 1;
393 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
394 return xfer_mode_str[highbit];
398 static void ata_dev_disable(struct ata_port *ap, struct ata_device *dev)
400 if (ata_dev_present(dev)) {
401 printk(KERN_WARNING "ata%u: dev %u disabled\n",
408 * ata_pio_devchk - PATA device presence detection
409 * @ap: ATA channel to examine
410 * @device: Device to examine (starting at zero)
412 * This technique was originally described in
413 * Hale Landis's ATADRVR (www.ata-atapi.com), and
414 * later found its way into the ATA/ATAPI spec.
416 * Write a pattern to the ATA shadow registers,
417 * and if a device is present, it will respond by
418 * correctly storing and echoing back the
419 * ATA shadow register contents.
425 static unsigned int ata_pio_devchk(struct ata_port *ap,
428 struct ata_ioports *ioaddr = &ap->ioaddr;
431 ap->ops->dev_select(ap, device);
433 outb(0x55, ioaddr->nsect_addr);
434 outb(0xaa, ioaddr->lbal_addr);
436 outb(0xaa, ioaddr->nsect_addr);
437 outb(0x55, ioaddr->lbal_addr);
439 outb(0x55, ioaddr->nsect_addr);
440 outb(0xaa, ioaddr->lbal_addr);
442 nsect = inb(ioaddr->nsect_addr);
443 lbal = inb(ioaddr->lbal_addr);
445 if ((nsect == 0x55) && (lbal == 0xaa))
446 return 1; /* we found a device */
448 return 0; /* nothing found */
452 * ata_mmio_devchk - PATA device presence detection
453 * @ap: ATA channel to examine
454 * @device: Device to examine (starting at zero)
456 * This technique was originally described in
457 * Hale Landis's ATADRVR (www.ata-atapi.com), and
458 * later found its way into the ATA/ATAPI spec.
460 * Write a pattern to the ATA shadow registers,
461 * and if a device is present, it will respond by
462 * correctly storing and echoing back the
463 * ATA shadow register contents.
469 static unsigned int ata_mmio_devchk(struct ata_port *ap,
472 struct ata_ioports *ioaddr = &ap->ioaddr;
475 ap->ops->dev_select(ap, device);
477 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
478 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
480 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
481 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
483 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
484 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
486 nsect = readb((void __iomem *) ioaddr->nsect_addr);
487 lbal = readb((void __iomem *) ioaddr->lbal_addr);
489 if ((nsect == 0x55) && (lbal == 0xaa))
490 return 1; /* we found a device */
492 return 0; /* nothing found */
496 * ata_devchk - PATA device presence detection
497 * @ap: ATA channel to examine
498 * @device: Device to examine (starting at zero)
500 * Dispatch ATA device presence detection, depending
501 * on whether we are using PIO or MMIO to talk to the
502 * ATA shadow registers.
508 static unsigned int ata_devchk(struct ata_port *ap,
511 if (ap->flags & ATA_FLAG_MMIO)
512 return ata_mmio_devchk(ap, device);
513 return ata_pio_devchk(ap, device);
517 * ata_dev_classify - determine device type based on ATA-spec signature
518 * @tf: ATA taskfile register set for device to be identified
520 * Determine from taskfile register contents whether a device is
521 * ATA or ATAPI, as per "Signature and persistence" section
522 * of ATA/PI spec (volume 1, sect 5.14).
528 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
529 * the event of failure.
532 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
534 /* Apple's open source Darwin code hints that some devices only
535 * put a proper signature into the LBA mid/high registers,
536 * So, we only check those. It's sufficient for uniqueness.
539 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
540 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
541 DPRINTK("found ATA device by sig\n");
545 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
546 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
547 DPRINTK("found ATAPI device by sig\n");
548 return ATA_DEV_ATAPI;
551 DPRINTK("unknown device\n");
552 return ATA_DEV_UNKNOWN;
556 * ata_dev_try_classify - Parse returned ATA device signature
557 * @ap: ATA channel to examine
558 * @device: Device to examine (starting at zero)
559 * @r_err: Value of error register on completion
561 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
562 * an ATA/ATAPI-defined set of values is placed in the ATA
563 * shadow registers, indicating the results of device detection
566 * Select the ATA device, and read the values from the ATA shadow
567 * registers. Then parse according to the Error register value,
568 * and the spec-defined values examined by ata_dev_classify().
574 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
578 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
580 struct ata_taskfile tf;
584 ap->ops->dev_select(ap, device);
586 memset(&tf, 0, sizeof(tf));
588 ap->ops->tf_read(ap, &tf);
593 /* see if device passed diags */
596 else if ((device == 0) && (err == 0x81))
601 /* determine if device is ATA or ATAPI */
602 class = ata_dev_classify(&tf);
604 if (class == ATA_DEV_UNKNOWN)
606 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
612 * ata_id_string - Convert IDENTIFY DEVICE page into string
613 * @id: IDENTIFY DEVICE results we will examine
614 * @s: string into which data is output
615 * @ofs: offset into identify device page
616 * @len: length of string to return. must be an even number.
618 * The strings in the IDENTIFY DEVICE page are broken up into
619 * 16-bit chunks. Run through the string, and output each
620 * 8-bit chunk linearly, regardless of platform.
626 void ata_id_string(const u16 *id, unsigned char *s,
627 unsigned int ofs, unsigned int len)
646 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
647 * @id: IDENTIFY DEVICE results we will examine
648 * @s: string into which data is output
649 * @ofs: offset into identify device page
650 * @len: length of string to return. must be an odd number.
652 * This function is identical to ata_id_string except that it
653 * trims trailing spaces and terminates the resulting string with
654 * null. @len must be actual maximum length (even number) + 1.
659 void ata_id_c_string(const u16 *id, unsigned char *s,
660 unsigned int ofs, unsigned int len)
666 ata_id_string(id, s, ofs, len - 1);
668 p = s + strnlen(s, len - 1);
669 while (p > s && p[-1] == ' ')
674 static u64 ata_id_n_sectors(const u16 *id)
676 if (ata_id_has_lba(id)) {
677 if (ata_id_has_lba48(id))
678 return ata_id_u64(id, 100);
680 return ata_id_u32(id, 60);
682 if (ata_id_current_chs_valid(id))
683 return ata_id_u32(id, 57);
685 return id[1] * id[3] * id[6];
690 * ata_noop_dev_select - Select device 0/1 on ATA bus
691 * @ap: ATA channel to manipulate
692 * @device: ATA device (numbered from zero) to select
694 * This function performs no actual function.
696 * May be used as the dev_select() entry in ata_port_operations.
701 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
707 * ata_std_dev_select - Select device 0/1 on ATA bus
708 * @ap: ATA channel to manipulate
709 * @device: ATA device (numbered from zero) to select
711 * Use the method defined in the ATA specification to
712 * make either device 0, or device 1, active on the
713 * ATA channel. Works with both PIO and MMIO.
715 * May be used as the dev_select() entry in ata_port_operations.
721 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
726 tmp = ATA_DEVICE_OBS;
728 tmp = ATA_DEVICE_OBS | ATA_DEV1;
730 if (ap->flags & ATA_FLAG_MMIO) {
731 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
733 outb(tmp, ap->ioaddr.device_addr);
735 ata_pause(ap); /* needed; also flushes, for mmio */
739 * ata_dev_select - Select device 0/1 on ATA bus
740 * @ap: ATA channel to manipulate
741 * @device: ATA device (numbered from zero) to select
742 * @wait: non-zero to wait for Status register BSY bit to clear
743 * @can_sleep: non-zero if context allows sleeping
745 * Use the method defined in the ATA specification to
746 * make either device 0, or device 1, active on the
749 * This is a high-level version of ata_std_dev_select(),
750 * which additionally provides the services of inserting
751 * the proper pauses and status polling, where needed.
757 void ata_dev_select(struct ata_port *ap, unsigned int device,
758 unsigned int wait, unsigned int can_sleep)
760 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
761 ap->id, device, wait);
766 ap->ops->dev_select(ap, device);
769 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
776 * ata_dump_id - IDENTIFY DEVICE info debugging output
777 * @id: IDENTIFY DEVICE page to dump
779 * Dump selected 16-bit words from the given IDENTIFY DEVICE
786 static inline void ata_dump_id(const u16 *id)
788 DPRINTK("49==0x%04x "
798 DPRINTK("80==0x%04x "
808 DPRINTK("88==0x%04x "
815 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
816 * @id: IDENTIFY data to compute xfer mask from
818 * Compute the xfermask for this device. This is not as trivial
819 * as it seems if we must consider early devices correctly.
821 * FIXME: pre IDE drive timing (do we care ?).
829 static unsigned int ata_id_xfermask(const u16 *id)
831 unsigned int pio_mask, mwdma_mask, udma_mask;
833 /* Usual case. Word 53 indicates word 64 is valid */
834 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
835 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
839 /* If word 64 isn't valid then Word 51 high byte holds
840 * the PIO timing number for the maximum. Turn it into
843 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
845 /* But wait.. there's more. Design your standards by
846 * committee and you too can get a free iordy field to
847 * process. However its the speeds not the modes that
848 * are supported... Note drivers using the timing API
849 * will get this right anyway
853 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
856 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
857 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
859 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
863 * ata_port_queue_task - Queue port_task
864 * @ap: The ata_port to queue port_task for
866 * Schedule @fn(@data) for execution after @delay jiffies using
867 * port_task. There is one port_task per port and it's the
868 * user(low level driver)'s responsibility to make sure that only
869 * one task is active at any given time.
871 * libata core layer takes care of synchronization between
872 * port_task and EH. ata_port_queue_task() may be ignored for EH
876 * Inherited from caller.
878 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
883 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
886 PREPARE_WORK(&ap->port_task, fn, data);
889 rc = queue_work(ata_wq, &ap->port_task);
891 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
893 /* rc == 0 means that another user is using port task */
898 * ata_port_flush_task - Flush port_task
899 * @ap: The ata_port to flush port_task for
901 * After this function completes, port_task is guranteed not to
902 * be running or scheduled.
905 * Kernel thread context (may sleep)
907 void ata_port_flush_task(struct ata_port *ap)
913 spin_lock_irqsave(&ap->host_set->lock, flags);
914 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
915 spin_unlock_irqrestore(&ap->host_set->lock, flags);
917 DPRINTK("flush #1\n");
918 flush_workqueue(ata_wq);
921 * At this point, if a task is running, it's guaranteed to see
922 * the FLUSH flag; thus, it will never queue pio tasks again.
925 if (!cancel_delayed_work(&ap->port_task)) {
926 DPRINTK("flush #2\n");
927 flush_workqueue(ata_wq);
930 spin_lock_irqsave(&ap->host_set->lock, flags);
931 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
932 spin_unlock_irqrestore(&ap->host_set->lock, flags);
937 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
939 struct completion *waiting = qc->private_data;
941 qc->ap->ops->tf_read(qc->ap, &qc->tf);
946 * ata_exec_internal - execute libata internal command
947 * @ap: Port to which the command is sent
948 * @dev: Device to which the command is sent
949 * @tf: Taskfile registers for the command and the result
950 * @dma_dir: Data tranfer direction of the command
951 * @buf: Data buffer of the command
952 * @buflen: Length of data buffer
954 * Executes libata internal command with timeout. @tf contains
955 * command on entry and result on return. Timeout and error
956 * conditions are reported via return value. No recovery action
957 * is taken after a command times out. It's caller's duty to
958 * clean up after timeout.
961 * None. Should be called with kernel context, might sleep.
965 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
966 struct ata_taskfile *tf,
967 int dma_dir, void *buf, unsigned int buflen)
969 u8 command = tf->command;
970 struct ata_queued_cmd *qc;
971 DECLARE_COMPLETION(wait);
973 unsigned int err_mask;
975 spin_lock_irqsave(&ap->host_set->lock, flags);
977 qc = ata_qc_new_init(ap, dev);
981 qc->dma_dir = dma_dir;
982 if (dma_dir != DMA_NONE) {
983 ata_sg_init_one(qc, buf, buflen);
984 qc->nsect = buflen / ATA_SECT_SIZE;
987 qc->private_data = &wait;
988 qc->complete_fn = ata_qc_complete_internal;
990 qc->err_mask = ata_qc_issue(qc);
994 spin_unlock_irqrestore(&ap->host_set->lock, flags);
996 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
997 ata_port_flush_task(ap);
999 spin_lock_irqsave(&ap->host_set->lock, flags);
1001 /* We're racing with irq here. If we lose, the
1002 * following test prevents us from completing the qc
1003 * again. If completion irq occurs after here but
1004 * before the caller cleans up, it will result in a
1005 * spurious interrupt. We can live with that.
1007 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1008 qc->err_mask = AC_ERR_TIMEOUT;
1009 ata_qc_complete(qc);
1010 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
1014 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1018 err_mask = qc->err_mask;
1022 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1023 * Until those drivers are fixed, we detect the condition
1024 * here, fail the command with AC_ERR_SYSTEM and reenable the
1027 * Note that this doesn't change any behavior as internal
1028 * command failure results in disabling the device in the
1029 * higher layer for LLDDs without new reset/EH callbacks.
1031 * Kill the following code as soon as those drivers are fixed.
1033 if (ap->flags & ATA_FLAG_PORT_DISABLED) {
1034 err_mask |= AC_ERR_SYSTEM;
1042 * ata_pio_need_iordy - check if iordy needed
1045 * Check if the current speed of the device requires IORDY. Used
1046 * by various controllers for chip configuration.
1049 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1052 int speed = adev->pio_mode - XFER_PIO_0;
1059 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1061 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1062 pio = adev->id[ATA_ID_EIDE_PIO];
1063 /* Is the speed faster than the drive allows non IORDY ? */
1065 /* This is cycle times not frequency - watch the logic! */
1066 if (pio > 240) /* PIO2 is 240nS per cycle */
1075 * ata_dev_read_id - Read ID data from the specified device
1076 * @ap: port on which target device resides
1077 * @dev: target device
1078 * @p_class: pointer to class of the target device (may be changed)
1079 * @post_reset: is this read ID post-reset?
1080 * @p_id: read IDENTIFY page (newly allocated)
1082 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1083 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1084 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1085 * for pre-ATA4 drives.
1088 * Kernel thread context (may sleep)
1091 * 0 on success, -errno otherwise.
1093 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
1094 unsigned int *p_class, int post_reset, u16 **p_id)
1096 unsigned int class = *p_class;
1097 struct ata_taskfile tf;
1098 unsigned int err_mask = 0;
1103 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1105 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1107 id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
1110 reason = "out of memory";
1115 ata_tf_init(ap, &tf, dev->devno);
1119 tf.command = ATA_CMD_ID_ATA;
1122 tf.command = ATA_CMD_ID_ATAPI;
1126 reason = "unsupported class";
1130 tf.protocol = ATA_PROT_PIO;
1132 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
1133 id, sizeof(id[0]) * ATA_ID_WORDS);
1136 reason = "I/O error";
1140 swap_buf_le16(id, ATA_ID_WORDS);
1143 if ((class == ATA_DEV_ATA) != ata_id_is_ata(id)) {
1145 reason = "device reports illegal type";
1149 if (post_reset && class == ATA_DEV_ATA) {
1151 * The exact sequence expected by certain pre-ATA4 drives is:
1154 * INITIALIZE DEVICE PARAMETERS
1156 * Some drives were very specific about that exact sequence.
1158 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1159 err_mask = ata_dev_init_params(ap, dev);
1162 reason = "INIT_DEV_PARAMS failed";
1166 /* current CHS translation info (id[53-58]) might be
1167 * changed. reread the identify device info.
1179 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1180 ap->id, dev->devno, reason);
1185 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1186 struct ata_device *dev)
1188 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1192 * ata_dev_configure - Configure the specified ATA/ATAPI device
1193 * @ap: Port on which target device resides
1194 * @dev: Target device to configure
1195 * @print_info: Enable device info printout
1197 * Configure @dev according to @dev->id. Generic and low-level
1198 * driver specific fixups are also applied.
1201 * Kernel thread context (may sleep)
1204 * 0 on success, -errno otherwise
1206 static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
1209 const u16 *id = dev->id;
1210 unsigned int xfer_mask;
1213 if (!ata_dev_present(dev)) {
1214 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1215 ap->id, dev->devno);
1219 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1221 /* print device capabilities */
1223 printk(KERN_DEBUG "ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1224 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1225 ap->id, dev->devno, id[49], id[82], id[83],
1226 id[84], id[85], id[86], id[87], id[88]);
1228 /* initialize to-be-configured parameters */
1230 dev->max_sectors = 0;
1238 * common ATA, ATAPI feature tests
1241 /* find max transfer mode; for printk only */
1242 xfer_mask = ata_id_xfermask(id);
1246 /* ATA-specific feature tests */
1247 if (dev->class == ATA_DEV_ATA) {
1248 dev->n_sectors = ata_id_n_sectors(id);
1250 if (ata_id_has_lba(id)) {
1251 const char *lba_desc;
1254 dev->flags |= ATA_DFLAG_LBA;
1255 if (ata_id_has_lba48(id)) {
1256 dev->flags |= ATA_DFLAG_LBA48;
1260 /* print device info to dmesg */
1262 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1263 "max %s, %Lu sectors: %s\n",
1265 ata_id_major_version(id),
1266 ata_mode_string(xfer_mask),
1267 (unsigned long long)dev->n_sectors,
1272 /* Default translation */
1273 dev->cylinders = id[1];
1275 dev->sectors = id[6];
1277 if (ata_id_current_chs_valid(id)) {
1278 /* Current CHS translation is valid. */
1279 dev->cylinders = id[54];
1280 dev->heads = id[55];
1281 dev->sectors = id[56];
1284 /* print device info to dmesg */
1286 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1287 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1289 ata_id_major_version(id),
1290 ata_mode_string(xfer_mask),
1291 (unsigned long long)dev->n_sectors,
1292 dev->cylinders, dev->heads, dev->sectors);
1298 /* ATAPI-specific feature tests */
1299 else if (dev->class == ATA_DEV_ATAPI) {
1300 rc = atapi_cdb_len(id);
1301 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1302 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1306 dev->cdb_len = (unsigned int) rc;
1308 /* print device info to dmesg */
1310 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1311 ap->id, dev->devno, ata_mode_string(xfer_mask));
1314 ap->host->max_cmd_len = 0;
1315 for (i = 0; i < ATA_MAX_DEVICES; i++)
1316 ap->host->max_cmd_len = max_t(unsigned int,
1317 ap->host->max_cmd_len,
1318 ap->device[i].cdb_len);
1320 /* limit bridge transfers to udma5, 200 sectors */
1321 if (ata_dev_knobble(ap, dev)) {
1323 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1324 ap->id, dev->devno);
1325 dev->udma_mask &= ATA_UDMA5;
1326 dev->max_sectors = ATA_MAX_SECTORS;
1329 if (ap->ops->dev_config)
1330 ap->ops->dev_config(ap, dev);
1332 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1336 DPRINTK("EXIT, err\n");
1341 * ata_bus_probe - Reset and probe ATA bus
1344 * Master ATA bus probing function. Initiates a hardware-dependent
1345 * bus reset, then attempts to identify any devices found on
1349 * PCI/etc. bus probe sem.
1352 * Zero on success, non-zero on error.
1355 static int ata_bus_probe(struct ata_port *ap)
1357 unsigned int classes[ATA_MAX_DEVICES];
1358 unsigned int i, rc, found = 0;
1362 /* reset and determine device classes */
1363 for (i = 0; i < ATA_MAX_DEVICES; i++)
1364 classes[i] = ATA_DEV_UNKNOWN;
1366 if (ap->ops->probe_reset) {
1367 rc = ap->ops->probe_reset(ap, classes);
1369 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1373 ap->ops->phy_reset(ap);
1375 if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
1376 for (i = 0; i < ATA_MAX_DEVICES; i++)
1377 classes[i] = ap->device[i].class;
1382 for (i = 0; i < ATA_MAX_DEVICES; i++)
1383 if (classes[i] == ATA_DEV_UNKNOWN)
1384 classes[i] = ATA_DEV_NONE;
1386 /* read IDENTIFY page and configure devices */
1387 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1388 struct ata_device *dev = &ap->device[i];
1390 dev->class = classes[i];
1392 if (!ata_dev_present(dev))
1395 WARN_ON(dev->id != NULL);
1396 if (ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id)) {
1397 dev->class = ATA_DEV_NONE;
1401 if (ata_dev_configure(ap, dev, 1)) {
1402 ata_dev_disable(ap, dev);
1410 goto err_out_disable;
1413 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1414 goto err_out_disable;
1419 ap->ops->port_disable(ap);
1424 * ata_port_probe - Mark port as enabled
1425 * @ap: Port for which we indicate enablement
1427 * Modify @ap data structure such that the system
1428 * thinks that the entire port is enabled.
1430 * LOCKING: host_set lock, or some other form of
1434 void ata_port_probe(struct ata_port *ap)
1436 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1440 * sata_print_link_status - Print SATA link status
1441 * @ap: SATA port to printk link status about
1443 * This function prints link speed and status of a SATA link.
1448 static void sata_print_link_status(struct ata_port *ap)
1453 if (!ap->ops->scr_read)
1456 sstatus = scr_read(ap, SCR_STATUS);
1458 if (sata_dev_present(ap)) {
1459 tmp = (sstatus >> 4) & 0xf;
1462 else if (tmp & (1 << 1))
1465 speed = "<unknown>";
1466 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1467 ap->id, speed, sstatus);
1469 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1475 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1476 * @ap: SATA port associated with target SATA PHY.
1478 * This function issues commands to standard SATA Sxxx
1479 * PHY registers, to wake up the phy (and device), and
1480 * clear any reset condition.
1483 * PCI/etc. bus probe sem.
1486 void __sata_phy_reset(struct ata_port *ap)
1489 unsigned long timeout = jiffies + (HZ * 5);
1491 if (ap->flags & ATA_FLAG_SATA_RESET) {
1492 /* issue phy wake/reset */
1493 scr_write_flush(ap, SCR_CONTROL, 0x301);
1494 /* Couldn't find anything in SATA I/II specs, but
1495 * AHCI-1.1 10.4.2 says at least 1 ms. */
1498 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1500 /* wait for phy to become ready, if necessary */
1503 sstatus = scr_read(ap, SCR_STATUS);
1504 if ((sstatus & 0xf) != 1)
1506 } while (time_before(jiffies, timeout));
1508 /* print link status */
1509 sata_print_link_status(ap);
1511 /* TODO: phy layer with polling, timeouts, etc. */
1512 if (sata_dev_present(ap))
1515 ata_port_disable(ap);
1517 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1520 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1521 ata_port_disable(ap);
1525 ap->cbl = ATA_CBL_SATA;
1529 * sata_phy_reset - Reset SATA bus.
1530 * @ap: SATA port associated with target SATA PHY.
1532 * This function resets the SATA bus, and then probes
1533 * the bus for devices.
1536 * PCI/etc. bus probe sem.
1539 void sata_phy_reset(struct ata_port *ap)
1541 __sata_phy_reset(ap);
1542 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1548 * ata_dev_pair - return other device on cable
1552 * Obtain the other device on the same cable, or if none is
1553 * present NULL is returned
1556 struct ata_device *ata_dev_pair(struct ata_port *ap, struct ata_device *adev)
1558 struct ata_device *pair = &ap->device[1 - adev->devno];
1559 if (!ata_dev_present(pair))
1565 * ata_port_disable - Disable port.
1566 * @ap: Port to be disabled.
1568 * Modify @ap data structure such that the system
1569 * thinks that the entire port is disabled, and should
1570 * never attempt to probe or communicate with devices
1573 * LOCKING: host_set lock, or some other form of
1577 void ata_port_disable(struct ata_port *ap)
1579 ap->device[0].class = ATA_DEV_NONE;
1580 ap->device[1].class = ATA_DEV_NONE;
1581 ap->flags |= ATA_FLAG_PORT_DISABLED;
1585 * This mode timing computation functionality is ported over from
1586 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1589 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1590 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1591 * for PIO 5, which is a nonstandard extension and UDMA6, which
1592 * is currently supported only by Maxtor drives.
1595 static const struct ata_timing ata_timing[] = {
1597 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1598 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1599 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1600 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1602 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1603 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1604 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1606 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1608 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1609 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1610 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1612 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1613 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1614 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1616 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1617 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1618 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1620 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1621 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1622 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1624 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1629 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1630 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1632 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1634 q->setup = EZ(t->setup * 1000, T);
1635 q->act8b = EZ(t->act8b * 1000, T);
1636 q->rec8b = EZ(t->rec8b * 1000, T);
1637 q->cyc8b = EZ(t->cyc8b * 1000, T);
1638 q->active = EZ(t->active * 1000, T);
1639 q->recover = EZ(t->recover * 1000, T);
1640 q->cycle = EZ(t->cycle * 1000, T);
1641 q->udma = EZ(t->udma * 1000, UT);
1644 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1645 struct ata_timing *m, unsigned int what)
1647 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1648 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1649 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1650 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1651 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1652 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1653 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1654 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1657 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1659 const struct ata_timing *t;
1661 for (t = ata_timing; t->mode != speed; t++)
1662 if (t->mode == 0xFF)
1667 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1668 struct ata_timing *t, int T, int UT)
1670 const struct ata_timing *s;
1671 struct ata_timing p;
1677 if (!(s = ata_timing_find_mode(speed)))
1680 memcpy(t, s, sizeof(*s));
1683 * If the drive is an EIDE drive, it can tell us it needs extended
1684 * PIO/MW_DMA cycle timing.
1687 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1688 memset(&p, 0, sizeof(p));
1689 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1690 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1691 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1692 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1693 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1695 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1699 * Convert the timing to bus clock counts.
1702 ata_timing_quantize(t, t, T, UT);
1705 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1706 * S.M.A.R.T * and some other commands. We have to ensure that the
1707 * DMA cycle timing is slower/equal than the fastest PIO timing.
1710 if (speed > XFER_PIO_4) {
1711 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1712 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1716 * Lengthen active & recovery time so that cycle time is correct.
1719 if (t->act8b + t->rec8b < t->cyc8b) {
1720 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1721 t->rec8b = t->cyc8b - t->act8b;
1724 if (t->active + t->recover < t->cycle) {
1725 t->active += (t->cycle - (t->active + t->recover)) / 2;
1726 t->recover = t->cycle - t->active;
1732 static int ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1734 unsigned int err_mask;
1737 if (dev->xfer_shift == ATA_SHIFT_PIO)
1738 dev->flags |= ATA_DFLAG_PIO;
1740 err_mask = ata_dev_set_xfermode(ap, dev);
1743 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1748 rc = ata_dev_revalidate(ap, dev, 0);
1751 "ata%u: failed to revalidate after set xfermode\n",
1756 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1757 dev->xfer_shift, (int)dev->xfer_mode);
1759 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1761 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1765 static int ata_host_set_pio(struct ata_port *ap)
1769 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1770 struct ata_device *dev = &ap->device[i];
1772 if (!ata_dev_present(dev))
1775 if (!dev->pio_mode) {
1776 printk(KERN_WARNING "ata%u: no PIO support for device %d.\n", ap->id, i);
1780 dev->xfer_mode = dev->pio_mode;
1781 dev->xfer_shift = ATA_SHIFT_PIO;
1782 if (ap->ops->set_piomode)
1783 ap->ops->set_piomode(ap, dev);
1789 static void ata_host_set_dma(struct ata_port *ap)
1793 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1794 struct ata_device *dev = &ap->device[i];
1796 if (!ata_dev_present(dev) || !dev->dma_mode)
1799 dev->xfer_mode = dev->dma_mode;
1800 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
1801 if (ap->ops->set_dmamode)
1802 ap->ops->set_dmamode(ap, dev);
1807 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1808 * @ap: port on which timings will be programmed
1810 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1813 * PCI/etc. bus probe sem.
1815 static void ata_set_mode(struct ata_port *ap)
1819 /* step 1: calculate xfer_mask */
1820 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1821 struct ata_device *dev = &ap->device[i];
1822 unsigned int pio_mask, dma_mask;
1824 if (!ata_dev_present(dev))
1827 ata_dev_xfermask(ap, dev);
1829 /* TODO: let LLDD filter dev->*_mask here */
1831 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
1832 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
1833 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
1834 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
1837 /* step 2: always set host PIO timings */
1838 rc = ata_host_set_pio(ap);
1842 /* step 3: set host DMA timings */
1843 ata_host_set_dma(ap);
1845 /* step 4: update devices' xfer mode */
1846 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1847 struct ata_device *dev = &ap->device[i];
1849 if (!ata_dev_present(dev))
1852 if (ata_dev_set_mode(ap, dev))
1856 if (ap->ops->post_set_mode)
1857 ap->ops->post_set_mode(ap);
1862 ata_port_disable(ap);
1866 * ata_tf_to_host - issue ATA taskfile to host controller
1867 * @ap: port to which command is being issued
1868 * @tf: ATA taskfile register set
1870 * Issues ATA taskfile register set to ATA host controller,
1871 * with proper synchronization with interrupt handler and
1875 * spin_lock_irqsave(host_set lock)
1878 static inline void ata_tf_to_host(struct ata_port *ap,
1879 const struct ata_taskfile *tf)
1881 ap->ops->tf_load(ap, tf);
1882 ap->ops->exec_command(ap, tf);
1886 * ata_busy_sleep - sleep until BSY clears, or timeout
1887 * @ap: port containing status register to be polled
1888 * @tmout_pat: impatience timeout
1889 * @tmout: overall timeout
1891 * Sleep until ATA Status register bit BSY clears,
1892 * or a timeout occurs.
1897 unsigned int ata_busy_sleep (struct ata_port *ap,
1898 unsigned long tmout_pat, unsigned long tmout)
1900 unsigned long timer_start, timeout;
1903 status = ata_busy_wait(ap, ATA_BUSY, 300);
1904 timer_start = jiffies;
1905 timeout = timer_start + tmout_pat;
1906 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1908 status = ata_busy_wait(ap, ATA_BUSY, 3);
1911 if (status & ATA_BUSY)
1912 printk(KERN_WARNING "ata%u is slow to respond, "
1913 "please be patient\n", ap->id);
1915 timeout = timer_start + tmout;
1916 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1918 status = ata_chk_status(ap);
1921 if (status & ATA_BUSY) {
1922 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1923 ap->id, tmout / HZ);
1930 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1932 struct ata_ioports *ioaddr = &ap->ioaddr;
1933 unsigned int dev0 = devmask & (1 << 0);
1934 unsigned int dev1 = devmask & (1 << 1);
1935 unsigned long timeout;
1937 /* if device 0 was found in ata_devchk, wait for its
1941 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1943 /* if device 1 was found in ata_devchk, wait for
1944 * register access, then wait for BSY to clear
1946 timeout = jiffies + ATA_TMOUT_BOOT;
1950 ap->ops->dev_select(ap, 1);
1951 if (ap->flags & ATA_FLAG_MMIO) {
1952 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1953 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1955 nsect = inb(ioaddr->nsect_addr);
1956 lbal = inb(ioaddr->lbal_addr);
1958 if ((nsect == 1) && (lbal == 1))
1960 if (time_after(jiffies, timeout)) {
1964 msleep(50); /* give drive a breather */
1967 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1969 /* is all this really necessary? */
1970 ap->ops->dev_select(ap, 0);
1972 ap->ops->dev_select(ap, 1);
1974 ap->ops->dev_select(ap, 0);
1977 static unsigned int ata_bus_softreset(struct ata_port *ap,
1978 unsigned int devmask)
1980 struct ata_ioports *ioaddr = &ap->ioaddr;
1982 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
1984 /* software reset. causes dev0 to be selected */
1985 if (ap->flags & ATA_FLAG_MMIO) {
1986 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1987 udelay(20); /* FIXME: flush */
1988 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
1989 udelay(20); /* FIXME: flush */
1990 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1992 outb(ap->ctl, ioaddr->ctl_addr);
1994 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
1996 outb(ap->ctl, ioaddr->ctl_addr);
1999 /* spec mandates ">= 2ms" before checking status.
2000 * We wait 150ms, because that was the magic delay used for
2001 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2002 * between when the ATA command register is written, and then
2003 * status is checked. Because waiting for "a while" before
2004 * checking status is fine, post SRST, we perform this magic
2005 * delay here as well.
2007 * Old drivers/ide uses the 2mS rule and then waits for ready
2011 /* Before we perform post reset processing we want to see if
2012 * the bus shows 0xFF because the odd clown forgets the D7
2013 * pulldown resistor.
2015 if (ata_check_status(ap) == 0xFF)
2016 return AC_ERR_OTHER;
2018 ata_bus_post_reset(ap, devmask);
2024 * ata_bus_reset - reset host port and associated ATA channel
2025 * @ap: port to reset
2027 * This is typically the first time we actually start issuing
2028 * commands to the ATA channel. We wait for BSY to clear, then
2029 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2030 * result. Determine what devices, if any, are on the channel
2031 * by looking at the device 0/1 error register. Look at the signature
2032 * stored in each device's taskfile registers, to determine if
2033 * the device is ATA or ATAPI.
2036 * PCI/etc. bus probe sem.
2037 * Obtains host_set lock.
2040 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2043 void ata_bus_reset(struct ata_port *ap)
2045 struct ata_ioports *ioaddr = &ap->ioaddr;
2046 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2048 unsigned int dev0, dev1 = 0, devmask = 0;
2050 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2052 /* determine if device 0/1 are present */
2053 if (ap->flags & ATA_FLAG_SATA_RESET)
2056 dev0 = ata_devchk(ap, 0);
2058 dev1 = ata_devchk(ap, 1);
2062 devmask |= (1 << 0);
2064 devmask |= (1 << 1);
2066 /* select device 0 again */
2067 ap->ops->dev_select(ap, 0);
2069 /* issue bus reset */
2070 if (ap->flags & ATA_FLAG_SRST)
2071 if (ata_bus_softreset(ap, devmask))
2075 * determine by signature whether we have ATA or ATAPI devices
2077 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2078 if ((slave_possible) && (err != 0x81))
2079 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2081 /* re-enable interrupts */
2082 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2085 /* is double-select really necessary? */
2086 if (ap->device[1].class != ATA_DEV_NONE)
2087 ap->ops->dev_select(ap, 1);
2088 if (ap->device[0].class != ATA_DEV_NONE)
2089 ap->ops->dev_select(ap, 0);
2091 /* if no devices were detected, disable this port */
2092 if ((ap->device[0].class == ATA_DEV_NONE) &&
2093 (ap->device[1].class == ATA_DEV_NONE))
2096 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2097 /* set up device control for ATA_FLAG_SATA_RESET */
2098 if (ap->flags & ATA_FLAG_MMIO)
2099 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2101 outb(ap->ctl, ioaddr->ctl_addr);
2108 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2109 ap->ops->port_disable(ap);
2114 static int sata_phy_resume(struct ata_port *ap)
2116 unsigned long timeout = jiffies + (HZ * 5);
2119 scr_write_flush(ap, SCR_CONTROL, 0x300);
2121 /* Wait for phy to become ready, if necessary. */
2124 sstatus = scr_read(ap, SCR_STATUS);
2125 if ((sstatus & 0xf) != 1)
2127 } while (time_before(jiffies, timeout));
2133 * ata_std_probeinit - initialize probing
2134 * @ap: port to be probed
2136 * @ap is about to be probed. Initialize it. This function is
2137 * to be used as standard callback for ata_drive_probe_reset().
2139 * NOTE!!! Do not use this function as probeinit if a low level
2140 * driver implements only hardreset. Just pass NULL as probeinit
2141 * in that case. Using this function is probably okay but doing
2142 * so makes reset sequence different from the original
2143 * ->phy_reset implementation and Jeff nervous. :-P
2145 extern void ata_std_probeinit(struct ata_port *ap)
2147 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
2148 sata_phy_resume(ap);
2149 if (sata_dev_present(ap))
2150 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2155 * ata_std_softreset - reset host port via ATA SRST
2156 * @ap: port to reset
2157 * @verbose: fail verbosely
2158 * @classes: resulting classes of attached devices
2160 * Reset host port using ATA SRST. This function is to be used
2161 * as standard callback for ata_drive_*_reset() functions.
2164 * Kernel thread context (may sleep)
2167 * 0 on success, -errno otherwise.
2169 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2171 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2172 unsigned int devmask = 0, err_mask;
2177 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2178 classes[0] = ATA_DEV_NONE;
2182 /* determine if device 0/1 are present */
2183 if (ata_devchk(ap, 0))
2184 devmask |= (1 << 0);
2185 if (slave_possible && ata_devchk(ap, 1))
2186 devmask |= (1 << 1);
2188 /* select device 0 again */
2189 ap->ops->dev_select(ap, 0);
2191 /* issue bus reset */
2192 DPRINTK("about to softreset, devmask=%x\n", devmask);
2193 err_mask = ata_bus_softreset(ap, devmask);
2196 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2199 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2204 /* determine by signature whether we have ATA or ATAPI devices */
2205 classes[0] = ata_dev_try_classify(ap, 0, &err);
2206 if (slave_possible && err != 0x81)
2207 classes[1] = ata_dev_try_classify(ap, 1, &err);
2210 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2215 * sata_std_hardreset - reset host port via SATA phy reset
2216 * @ap: port to reset
2217 * @verbose: fail verbosely
2218 * @class: resulting class of attached device
2220 * SATA phy-reset host port using DET bits of SControl register.
2221 * This function is to be used as standard callback for
2222 * ata_drive_*_reset().
2225 * Kernel thread context (may sleep)
2228 * 0 on success, -errno otherwise.
2230 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2234 /* Issue phy wake/reset */
2235 scr_write_flush(ap, SCR_CONTROL, 0x301);
2238 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2239 * 10.4.2 says at least 1 ms.
2243 /* Bring phy back */
2244 sata_phy_resume(ap);
2246 /* TODO: phy layer with polling, timeouts, etc. */
2247 if (!sata_dev_present(ap)) {
2248 *class = ATA_DEV_NONE;
2249 DPRINTK("EXIT, link offline\n");
2253 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2255 printk(KERN_ERR "ata%u: COMRESET failed "
2256 "(device not ready)\n", ap->id);
2258 DPRINTK("EXIT, device not ready\n");
2262 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2264 *class = ata_dev_try_classify(ap, 0, NULL);
2266 DPRINTK("EXIT, class=%u\n", *class);
2271 * ata_std_postreset - standard postreset callback
2272 * @ap: the target ata_port
2273 * @classes: classes of attached devices
2275 * This function is invoked after a successful reset. Note that
2276 * the device might have been reset more than once using
2277 * different reset methods before postreset is invoked.
2279 * This function is to be used as standard callback for
2280 * ata_drive_*_reset().
2283 * Kernel thread context (may sleep)
2285 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2289 /* set cable type if it isn't already set */
2290 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2291 ap->cbl = ATA_CBL_SATA;
2293 /* print link status */
2294 if (ap->cbl == ATA_CBL_SATA)
2295 sata_print_link_status(ap);
2297 /* re-enable interrupts */
2298 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2301 /* is double-select really necessary? */
2302 if (classes[0] != ATA_DEV_NONE)
2303 ap->ops->dev_select(ap, 1);
2304 if (classes[1] != ATA_DEV_NONE)
2305 ap->ops->dev_select(ap, 0);
2307 /* bail out if no device is present */
2308 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2309 DPRINTK("EXIT, no device\n");
2313 /* set up device control */
2314 if (ap->ioaddr.ctl_addr) {
2315 if (ap->flags & ATA_FLAG_MMIO)
2316 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2318 outb(ap->ctl, ap->ioaddr.ctl_addr);
2325 * ata_std_probe_reset - standard probe reset method
2326 * @ap: prot to perform probe-reset
2327 * @classes: resulting classes of attached devices
2329 * The stock off-the-shelf ->probe_reset method.
2332 * Kernel thread context (may sleep)
2335 * 0 on success, -errno otherwise.
2337 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2339 ata_reset_fn_t hardreset;
2342 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2343 hardreset = sata_std_hardreset;
2345 return ata_drive_probe_reset(ap, ata_std_probeinit,
2346 ata_std_softreset, hardreset,
2347 ata_std_postreset, classes);
2350 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2351 ata_postreset_fn_t postreset,
2352 unsigned int *classes)
2356 for (i = 0; i < ATA_MAX_DEVICES; i++)
2357 classes[i] = ATA_DEV_UNKNOWN;
2359 rc = reset(ap, 0, classes);
2363 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2364 * is complete and convert all ATA_DEV_UNKNOWN to
2367 for (i = 0; i < ATA_MAX_DEVICES; i++)
2368 if (classes[i] != ATA_DEV_UNKNOWN)
2371 if (i < ATA_MAX_DEVICES)
2372 for (i = 0; i < ATA_MAX_DEVICES; i++)
2373 if (classes[i] == ATA_DEV_UNKNOWN)
2374 classes[i] = ATA_DEV_NONE;
2377 postreset(ap, classes);
2379 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2383 * ata_drive_probe_reset - Perform probe reset with given methods
2384 * @ap: port to reset
2385 * @probeinit: probeinit method (can be NULL)
2386 * @softreset: softreset method (can be NULL)
2387 * @hardreset: hardreset method (can be NULL)
2388 * @postreset: postreset method (can be NULL)
2389 * @classes: resulting classes of attached devices
2391 * Reset the specified port and classify attached devices using
2392 * given methods. This function prefers softreset but tries all
2393 * possible reset sequences to reset and classify devices. This
2394 * function is intended to be used for constructing ->probe_reset
2395 * callback by low level drivers.
2397 * Reset methods should follow the following rules.
2399 * - Return 0 on sucess, -errno on failure.
2400 * - If classification is supported, fill classes[] with
2401 * recognized class codes.
2402 * - If classification is not supported, leave classes[] alone.
2403 * - If verbose is non-zero, print error message on failure;
2404 * otherwise, shut up.
2407 * Kernel thread context (may sleep)
2410 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2411 * if classification fails, and any error code from reset
2414 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2415 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2416 ata_postreset_fn_t postreset, unsigned int *classes)
2424 rc = do_probe_reset(ap, softreset, postreset, classes);
2432 rc = do_probe_reset(ap, hardreset, postreset, classes);
2433 if (rc == 0 || rc != -ENODEV)
2437 rc = do_probe_reset(ap, softreset, postreset, classes);
2443 * ata_dev_same_device - Determine whether new ID matches configured device
2444 * @ap: port on which the device to compare against resides
2445 * @dev: device to compare against
2446 * @new_class: class of the new device
2447 * @new_id: IDENTIFY page of the new device
2449 * Compare @new_class and @new_id against @dev and determine
2450 * whether @dev is the device indicated by @new_class and
2457 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2459 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2460 unsigned int new_class, const u16 *new_id)
2462 const u16 *old_id = dev->id;
2463 unsigned char model[2][41], serial[2][21];
2466 if (dev->class != new_class) {
2468 "ata%u: dev %u class mismatch %d != %d\n",
2469 ap->id, dev->devno, dev->class, new_class);
2473 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2474 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2475 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2476 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2477 new_n_sectors = ata_id_n_sectors(new_id);
2479 if (strcmp(model[0], model[1])) {
2481 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2482 ap->id, dev->devno, model[0], model[1]);
2486 if (strcmp(serial[0], serial[1])) {
2488 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2489 ap->id, dev->devno, serial[0], serial[1]);
2493 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2495 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2496 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2497 (unsigned long long)new_n_sectors);
2505 * ata_dev_revalidate - Revalidate ATA device
2506 * @ap: port on which the device to revalidate resides
2507 * @dev: device to revalidate
2508 * @post_reset: is this revalidation after reset?
2510 * Re-read IDENTIFY page and make sure @dev is still attached to
2514 * Kernel thread context (may sleep)
2517 * 0 on success, negative errno otherwise
2519 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2526 if (!ata_dev_present(dev))
2532 /* allocate & read ID data */
2533 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2537 /* is the device still there? */
2538 if (!ata_dev_same_device(ap, dev, class, id)) {
2546 /* configure device according to the new ID */
2547 return ata_dev_configure(ap, dev, 0);
2550 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2551 ap->id, dev->devno, rc);
2556 static const char * const ata_dma_blacklist [] = {
2557 "WDC AC11000H", NULL,
2558 "WDC AC22100H", NULL,
2559 "WDC AC32500H", NULL,
2560 "WDC AC33100H", NULL,
2561 "WDC AC31600H", NULL,
2562 "WDC AC32100H", "24.09P07",
2563 "WDC AC23200L", "21.10N21",
2564 "Compaq CRD-8241B", NULL,
2569 "SanDisk SDP3B", NULL,
2570 "SanDisk SDP3B-64", NULL,
2571 "SANYO CD-ROM CRD", NULL,
2572 "HITACHI CDR-8", NULL,
2573 "HITACHI CDR-8335", NULL,
2574 "HITACHI CDR-8435", NULL,
2575 "Toshiba CD-ROM XM-6202B", NULL,
2576 "TOSHIBA CD-ROM XM-1702BC", NULL,
2578 "E-IDE CD-ROM CR-840", NULL,
2579 "CD-ROM Drive/F5A", NULL,
2580 "WPI CDD-820", NULL,
2581 "SAMSUNG CD-ROM SC-148C", NULL,
2582 "SAMSUNG CD-ROM SC", NULL,
2583 "SanDisk SDP3B-64", NULL,
2584 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2585 "_NEC DV5800A", NULL,
2586 "SAMSUNG CD-ROM SN-124", "N001"
2589 static int ata_strim(char *s, size_t len)
2591 len = strnlen(s, len);
2593 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2594 while ((len > 0) && (s[len - 1] == ' ')) {
2601 static int ata_dma_blacklisted(const struct ata_device *dev)
2603 unsigned char model_num[40];
2604 unsigned char model_rev[16];
2605 unsigned int nlen, rlen;
2608 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2610 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2612 nlen = ata_strim(model_num, sizeof(model_num));
2613 rlen = ata_strim(model_rev, sizeof(model_rev));
2615 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2616 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2617 if (ata_dma_blacklist[i+1] == NULL)
2619 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2627 * ata_dev_xfermask - Compute supported xfermask of the given device
2628 * @ap: Port on which the device to compute xfermask for resides
2629 * @dev: Device to compute xfermask for
2631 * Compute supported xfermask of @dev and store it in
2632 * dev->*_mask. This function is responsible for applying all
2633 * known limits including host controller limits, device
2636 * FIXME: The current implementation limits all transfer modes to
2637 * the fastest of the lowested device on the port. This is not
2638 * required on most controllers.
2643 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
2645 unsigned long xfer_mask;
2648 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
2651 /* use port-wide xfermask for now */
2652 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2653 struct ata_device *d = &ap->device[i];
2654 if (!ata_dev_present(d))
2656 xfer_mask &= ata_pack_xfermask(d->pio_mask, d->mwdma_mask,
2658 xfer_mask &= ata_id_xfermask(d->id);
2659 if (ata_dma_blacklisted(d))
2660 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2663 if (ata_dma_blacklisted(dev))
2664 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2665 "disabling DMA\n", ap->id, dev->devno);
2667 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2672 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2673 * @ap: Port associated with device @dev
2674 * @dev: Device to which command will be sent
2676 * Issue SET FEATURES - XFER MODE command to device @dev
2680 * PCI/etc. bus probe sem.
2683 * 0 on success, AC_ERR_* mask otherwise.
2686 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
2687 struct ata_device *dev)
2689 struct ata_taskfile tf;
2690 unsigned int err_mask;
2692 /* set up set-features taskfile */
2693 DPRINTK("set features - xfer mode\n");
2695 ata_tf_init(ap, &tf, dev->devno);
2696 tf.command = ATA_CMD_SET_FEATURES;
2697 tf.feature = SETFEATURES_XFER;
2698 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2699 tf.protocol = ATA_PROT_NODATA;
2700 tf.nsect = dev->xfer_mode;
2702 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2704 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2709 * ata_dev_init_params - Issue INIT DEV PARAMS command
2710 * @ap: Port associated with device @dev
2711 * @dev: Device to which command will be sent
2714 * Kernel thread context (may sleep)
2717 * 0 on success, AC_ERR_* mask otherwise.
2720 static unsigned int ata_dev_init_params(struct ata_port *ap,
2721 struct ata_device *dev)
2723 struct ata_taskfile tf;
2724 unsigned int err_mask;
2725 u16 sectors = dev->id[6];
2726 u16 heads = dev->id[3];
2728 /* Number of sectors per track 1-255. Number of heads 1-16 */
2729 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2732 /* set up init dev params taskfile */
2733 DPRINTK("init dev params \n");
2735 ata_tf_init(ap, &tf, dev->devno);
2736 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2737 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2738 tf.protocol = ATA_PROT_NODATA;
2740 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2742 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2744 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2749 * ata_sg_clean - Unmap DMA memory associated with command
2750 * @qc: Command containing DMA memory to be released
2752 * Unmap all mapped DMA memory associated with this command.
2755 * spin_lock_irqsave(host_set lock)
2758 static void ata_sg_clean(struct ata_queued_cmd *qc)
2760 struct ata_port *ap = qc->ap;
2761 struct scatterlist *sg = qc->__sg;
2762 int dir = qc->dma_dir;
2763 void *pad_buf = NULL;
2765 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2766 WARN_ON(sg == NULL);
2768 if (qc->flags & ATA_QCFLAG_SINGLE)
2769 WARN_ON(qc->n_elem > 1);
2771 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2773 /* if we padded the buffer out to 32-bit bound, and data
2774 * xfer direction is from-device, we must copy from the
2775 * pad buffer back into the supplied buffer
2777 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2778 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2780 if (qc->flags & ATA_QCFLAG_SG) {
2782 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
2783 /* restore last sg */
2784 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2786 struct scatterlist *psg = &qc->pad_sgent;
2787 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2788 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2789 kunmap_atomic(addr, KM_IRQ0);
2793 dma_unmap_single(ap->dev,
2794 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2797 sg->length += qc->pad_len;
2799 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2800 pad_buf, qc->pad_len);
2803 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2808 * ata_fill_sg - Fill PCI IDE PRD table
2809 * @qc: Metadata associated with taskfile to be transferred
2811 * Fill PCI IDE PRD (scatter-gather) table with segments
2812 * associated with the current disk command.
2815 * spin_lock_irqsave(host_set lock)
2818 static void ata_fill_sg(struct ata_queued_cmd *qc)
2820 struct ata_port *ap = qc->ap;
2821 struct scatterlist *sg;
2824 WARN_ON(qc->__sg == NULL);
2825 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2828 ata_for_each_sg(sg, qc) {
2832 /* determine if physical DMA addr spans 64K boundary.
2833 * Note h/w doesn't support 64-bit, so we unconditionally
2834 * truncate dma_addr_t to u32.
2836 addr = (u32) sg_dma_address(sg);
2837 sg_len = sg_dma_len(sg);
2840 offset = addr & 0xffff;
2842 if ((offset + sg_len) > 0x10000)
2843 len = 0x10000 - offset;
2845 ap->prd[idx].addr = cpu_to_le32(addr);
2846 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2847 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2856 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2859 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2860 * @qc: Metadata associated with taskfile to check
2862 * Allow low-level driver to filter ATA PACKET commands, returning
2863 * a status indicating whether or not it is OK to use DMA for the
2864 * supplied PACKET command.
2867 * spin_lock_irqsave(host_set lock)
2869 * RETURNS: 0 when ATAPI DMA can be used
2872 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2874 struct ata_port *ap = qc->ap;
2875 int rc = 0; /* Assume ATAPI DMA is OK by default */
2877 if (ap->ops->check_atapi_dma)
2878 rc = ap->ops->check_atapi_dma(qc);
2883 * ata_qc_prep - Prepare taskfile for submission
2884 * @qc: Metadata associated with taskfile to be prepared
2886 * Prepare ATA taskfile for submission.
2889 * spin_lock_irqsave(host_set lock)
2891 void ata_qc_prep(struct ata_queued_cmd *qc)
2893 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2899 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
2902 * ata_sg_init_one - Associate command with memory buffer
2903 * @qc: Command to be associated
2904 * @buf: Memory buffer
2905 * @buflen: Length of memory buffer, in bytes.
2907 * Initialize the data-related elements of queued_cmd @qc
2908 * to point to a single memory buffer, @buf of byte length @buflen.
2911 * spin_lock_irqsave(host_set lock)
2914 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2916 struct scatterlist *sg;
2918 qc->flags |= ATA_QCFLAG_SINGLE;
2920 memset(&qc->sgent, 0, sizeof(qc->sgent));
2921 qc->__sg = &qc->sgent;
2923 qc->orig_n_elem = 1;
2927 sg_init_one(sg, buf, buflen);
2931 * ata_sg_init - Associate command with scatter-gather table.
2932 * @qc: Command to be associated
2933 * @sg: Scatter-gather table.
2934 * @n_elem: Number of elements in s/g table.
2936 * Initialize the data-related elements of queued_cmd @qc
2937 * to point to a scatter-gather table @sg, containing @n_elem
2941 * spin_lock_irqsave(host_set lock)
2944 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2945 unsigned int n_elem)
2947 qc->flags |= ATA_QCFLAG_SG;
2949 qc->n_elem = n_elem;
2950 qc->orig_n_elem = n_elem;
2954 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2955 * @qc: Command with memory buffer to be mapped.
2957 * DMA-map the memory buffer associated with queued_cmd @qc.
2960 * spin_lock_irqsave(host_set lock)
2963 * Zero on success, negative on error.
2966 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
2968 struct ata_port *ap = qc->ap;
2969 int dir = qc->dma_dir;
2970 struct scatterlist *sg = qc->__sg;
2971 dma_addr_t dma_address;
2974 /* we must lengthen transfers to end on a 32-bit boundary */
2975 qc->pad_len = sg->length & 3;
2977 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2978 struct scatterlist *psg = &qc->pad_sgent;
2980 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2982 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2984 if (qc->tf.flags & ATA_TFLAG_WRITE)
2985 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
2988 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2989 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2991 sg->length -= qc->pad_len;
2992 if (sg->length == 0)
2995 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2996 sg->length, qc->pad_len);
3004 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3006 if (dma_mapping_error(dma_address)) {
3008 sg->length += qc->pad_len;
3012 sg_dma_address(sg) = dma_address;
3013 sg_dma_len(sg) = sg->length;
3016 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3017 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3023 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3024 * @qc: Command with scatter-gather table to be mapped.
3026 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3029 * spin_lock_irqsave(host_set lock)
3032 * Zero on success, negative on error.
3036 static int ata_sg_setup(struct ata_queued_cmd *qc)
3038 struct ata_port *ap = qc->ap;
3039 struct scatterlist *sg = qc->__sg;
3040 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3041 int n_elem, pre_n_elem, dir, trim_sg = 0;
3043 VPRINTK("ENTER, ata%u\n", ap->id);
3044 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3046 /* we must lengthen transfers to end on a 32-bit boundary */
3047 qc->pad_len = lsg->length & 3;
3049 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3050 struct scatterlist *psg = &qc->pad_sgent;
3051 unsigned int offset;
3053 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3055 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3058 * psg->page/offset are used to copy to-be-written
3059 * data in this function or read data in ata_sg_clean.
3061 offset = lsg->offset + lsg->length - qc->pad_len;
3062 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3063 psg->offset = offset_in_page(offset);
3065 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3066 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3067 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3068 kunmap_atomic(addr, KM_IRQ0);
3071 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3072 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3074 lsg->length -= qc->pad_len;
3075 if (lsg->length == 0)
3078 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3079 qc->n_elem - 1, lsg->length, qc->pad_len);
3082 pre_n_elem = qc->n_elem;
3083 if (trim_sg && pre_n_elem)
3092 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3094 /* restore last sg */
3095 lsg->length += qc->pad_len;
3099 DPRINTK("%d sg elements mapped\n", n_elem);
3102 qc->n_elem = n_elem;
3108 * ata_poll_qc_complete - turn irq back on and finish qc
3109 * @qc: Command to complete
3110 * @err_mask: ATA status register content
3113 * None. (grabs host lock)
3116 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3118 struct ata_port *ap = qc->ap;
3119 unsigned long flags;
3121 spin_lock_irqsave(&ap->host_set->lock, flags);
3122 ap->flags &= ~ATA_FLAG_NOINTR;
3124 ata_qc_complete(qc);
3125 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3129 * ata_pio_poll - poll using PIO, depending on current state
3130 * @ap: the target ata_port
3133 * None. (executing in kernel thread context)
3136 * timeout value to use
3139 static unsigned long ata_pio_poll(struct ata_port *ap)
3141 struct ata_queued_cmd *qc;
3143 unsigned int poll_state = HSM_ST_UNKNOWN;
3144 unsigned int reg_state = HSM_ST_UNKNOWN;
3146 qc = ata_qc_from_tag(ap, ap->active_tag);
3147 WARN_ON(qc == NULL);
3149 switch (ap->hsm_task_state) {
3152 poll_state = HSM_ST_POLL;
3156 case HSM_ST_LAST_POLL:
3157 poll_state = HSM_ST_LAST_POLL;
3158 reg_state = HSM_ST_LAST;
3165 status = ata_chk_status(ap);
3166 if (status & ATA_BUSY) {
3167 if (time_after(jiffies, ap->pio_task_timeout)) {
3168 qc->err_mask |= AC_ERR_TIMEOUT;
3169 ap->hsm_task_state = HSM_ST_TMOUT;
3172 ap->hsm_task_state = poll_state;
3173 return ATA_SHORT_PAUSE;
3176 ap->hsm_task_state = reg_state;
3181 * ata_pio_complete - check if drive is busy or idle
3182 * @ap: the target ata_port
3185 * None. (executing in kernel thread context)
3188 * Non-zero if qc completed, zero otherwise.
3191 static int ata_pio_complete (struct ata_port *ap)
3193 struct ata_queued_cmd *qc;
3197 * This is purely heuristic. This is a fast path. Sometimes when
3198 * we enter, BSY will be cleared in a chk-status or two. If not,
3199 * the drive is probably seeking or something. Snooze for a couple
3200 * msecs, then chk-status again. If still busy, fall back to
3201 * HSM_ST_POLL state.
3203 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3204 if (drv_stat & ATA_BUSY) {
3206 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3207 if (drv_stat & ATA_BUSY) {
3208 ap->hsm_task_state = HSM_ST_LAST_POLL;
3209 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3214 qc = ata_qc_from_tag(ap, ap->active_tag);
3215 WARN_ON(qc == NULL);
3217 drv_stat = ata_wait_idle(ap);
3218 if (!ata_ok(drv_stat)) {
3219 qc->err_mask |= __ac_err_mask(drv_stat);
3220 ap->hsm_task_state = HSM_ST_ERR;
3224 ap->hsm_task_state = HSM_ST_IDLE;
3226 WARN_ON(qc->err_mask);
3227 ata_poll_qc_complete(qc);
3229 /* another command may start at this point */
3236 * swap_buf_le16 - swap halves of 16-bit words in place
3237 * @buf: Buffer to swap
3238 * @buf_words: Number of 16-bit words in buffer.
3240 * Swap halves of 16-bit words if needed to convert from
3241 * little-endian byte order to native cpu byte order, or
3245 * Inherited from caller.
3247 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3252 for (i = 0; i < buf_words; i++)
3253 buf[i] = le16_to_cpu(buf[i]);
3254 #endif /* __BIG_ENDIAN */
3258 * ata_mmio_data_xfer - Transfer data by MMIO
3259 * @ap: port to read/write
3261 * @buflen: buffer length
3262 * @write_data: read/write
3264 * Transfer data from/to the device data register by MMIO.
3267 * Inherited from caller.
3270 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3271 unsigned int buflen, int write_data)
3274 unsigned int words = buflen >> 1;
3275 u16 *buf16 = (u16 *) buf;
3276 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3278 /* Transfer multiple of 2 bytes */
3280 for (i = 0; i < words; i++)
3281 writew(le16_to_cpu(buf16[i]), mmio);
3283 for (i = 0; i < words; i++)
3284 buf16[i] = cpu_to_le16(readw(mmio));
3287 /* Transfer trailing 1 byte, if any. */
3288 if (unlikely(buflen & 0x01)) {
3289 u16 align_buf[1] = { 0 };
3290 unsigned char *trailing_buf = buf + buflen - 1;
3293 memcpy(align_buf, trailing_buf, 1);
3294 writew(le16_to_cpu(align_buf[0]), mmio);
3296 align_buf[0] = cpu_to_le16(readw(mmio));
3297 memcpy(trailing_buf, align_buf, 1);
3303 * ata_pio_data_xfer - Transfer data by PIO
3304 * @ap: port to read/write
3306 * @buflen: buffer length
3307 * @write_data: read/write
3309 * Transfer data from/to the device data register by PIO.
3312 * Inherited from caller.
3315 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3316 unsigned int buflen, int write_data)
3318 unsigned int words = buflen >> 1;
3320 /* Transfer multiple of 2 bytes */
3322 outsw(ap->ioaddr.data_addr, buf, words);
3324 insw(ap->ioaddr.data_addr, buf, words);
3326 /* Transfer trailing 1 byte, if any. */
3327 if (unlikely(buflen & 0x01)) {
3328 u16 align_buf[1] = { 0 };
3329 unsigned char *trailing_buf = buf + buflen - 1;
3332 memcpy(align_buf, trailing_buf, 1);
3333 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3335 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3336 memcpy(trailing_buf, align_buf, 1);
3342 * ata_data_xfer - Transfer data from/to the data register.
3343 * @ap: port to read/write
3345 * @buflen: buffer length
3346 * @do_write: read/write
3348 * Transfer data from/to the device data register.
3351 * Inherited from caller.
3354 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3355 unsigned int buflen, int do_write)
3357 /* Make the crap hardware pay the costs not the good stuff */
3358 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3359 unsigned long flags;
3360 local_irq_save(flags);
3361 if (ap->flags & ATA_FLAG_MMIO)
3362 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3364 ata_pio_data_xfer(ap, buf, buflen, do_write);
3365 local_irq_restore(flags);
3367 if (ap->flags & ATA_FLAG_MMIO)
3368 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3370 ata_pio_data_xfer(ap, buf, buflen, do_write);
3375 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3376 * @qc: Command on going
3378 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3381 * Inherited from caller.
3384 static void ata_pio_sector(struct ata_queued_cmd *qc)
3386 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3387 struct scatterlist *sg = qc->__sg;
3388 struct ata_port *ap = qc->ap;
3390 unsigned int offset;
3393 if (qc->cursect == (qc->nsect - 1))
3394 ap->hsm_task_state = HSM_ST_LAST;
3396 page = sg[qc->cursg].page;
3397 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3399 /* get the current page and offset */
3400 page = nth_page(page, (offset >> PAGE_SHIFT));
3401 offset %= PAGE_SIZE;
3403 buf = kmap(page) + offset;
3408 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3413 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3415 /* do the actual data transfer */
3416 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3417 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3423 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3424 * @qc: Command on going
3425 * @bytes: number of bytes
3427 * Transfer Transfer data from/to the ATAPI device.
3430 * Inherited from caller.
3434 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3436 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3437 struct scatterlist *sg = qc->__sg;
3438 struct ata_port *ap = qc->ap;
3441 unsigned int offset, count;
3443 if (qc->curbytes + bytes >= qc->nbytes)
3444 ap->hsm_task_state = HSM_ST_LAST;
3447 if (unlikely(qc->cursg >= qc->n_elem)) {
3449 * The end of qc->sg is reached and the device expects
3450 * more data to transfer. In order not to overrun qc->sg
3451 * and fulfill length specified in the byte count register,
3452 * - for read case, discard trailing data from the device
3453 * - for write case, padding zero data to the device
3455 u16 pad_buf[1] = { 0 };
3456 unsigned int words = bytes >> 1;
3459 if (words) /* warning if bytes > 1 */
3460 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3463 for (i = 0; i < words; i++)
3464 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3466 ap->hsm_task_state = HSM_ST_LAST;
3470 sg = &qc->__sg[qc->cursg];
3473 offset = sg->offset + qc->cursg_ofs;
3475 /* get the current page and offset */
3476 page = nth_page(page, (offset >> PAGE_SHIFT));
3477 offset %= PAGE_SIZE;
3479 /* don't overrun current sg */
3480 count = min(sg->length - qc->cursg_ofs, bytes);
3482 /* don't cross page boundaries */
3483 count = min(count, (unsigned int)PAGE_SIZE - offset);
3485 buf = kmap(page) + offset;
3488 qc->curbytes += count;
3489 qc->cursg_ofs += count;
3491 if (qc->cursg_ofs == sg->length) {
3496 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3498 /* do the actual data transfer */
3499 ata_data_xfer(ap, buf, count, do_write);
3508 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3509 * @qc: Command on going
3511 * Transfer Transfer data from/to the ATAPI device.
3514 * Inherited from caller.
3517 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3519 struct ata_port *ap = qc->ap;
3520 struct ata_device *dev = qc->dev;
3521 unsigned int ireason, bc_lo, bc_hi, bytes;
3522 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3524 ap->ops->tf_read(ap, &qc->tf);
3525 ireason = qc->tf.nsect;
3526 bc_lo = qc->tf.lbam;
3527 bc_hi = qc->tf.lbah;
3528 bytes = (bc_hi << 8) | bc_lo;
3530 /* shall be cleared to zero, indicating xfer of data */
3531 if (ireason & (1 << 0))
3534 /* make sure transfer direction matches expected */
3535 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3536 if (do_write != i_write)
3539 __atapi_pio_bytes(qc, bytes);
3544 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3545 ap->id, dev->devno);
3546 qc->err_mask |= AC_ERR_HSM;
3547 ap->hsm_task_state = HSM_ST_ERR;
3551 * ata_pio_block - start PIO on a block
3552 * @ap: the target ata_port
3555 * None. (executing in kernel thread context)
3558 static void ata_pio_block(struct ata_port *ap)
3560 struct ata_queued_cmd *qc;
3564 * This is purely heuristic. This is a fast path.
3565 * Sometimes when we enter, BSY will be cleared in
3566 * a chk-status or two. If not, the drive is probably seeking
3567 * or something. Snooze for a couple msecs, then
3568 * chk-status again. If still busy, fall back to
3569 * HSM_ST_POLL state.
3571 status = ata_busy_wait(ap, ATA_BUSY, 5);
3572 if (status & ATA_BUSY) {
3574 status = ata_busy_wait(ap, ATA_BUSY, 10);
3575 if (status & ATA_BUSY) {
3576 ap->hsm_task_state = HSM_ST_POLL;
3577 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3582 qc = ata_qc_from_tag(ap, ap->active_tag);
3583 WARN_ON(qc == NULL);
3586 if (status & (ATA_ERR | ATA_DF)) {
3587 qc->err_mask |= AC_ERR_DEV;
3588 ap->hsm_task_state = HSM_ST_ERR;
3592 /* transfer data if any */
3593 if (is_atapi_taskfile(&qc->tf)) {
3594 /* DRQ=0 means no more data to transfer */
3595 if ((status & ATA_DRQ) == 0) {
3596 ap->hsm_task_state = HSM_ST_LAST;
3600 atapi_pio_bytes(qc);
3602 /* handle BSY=0, DRQ=0 as error */
3603 if ((status & ATA_DRQ) == 0) {
3604 qc->err_mask |= AC_ERR_HSM;
3605 ap->hsm_task_state = HSM_ST_ERR;
3613 static void ata_pio_error(struct ata_port *ap)
3615 struct ata_queued_cmd *qc;
3617 qc = ata_qc_from_tag(ap, ap->active_tag);
3618 WARN_ON(qc == NULL);
3620 if (qc->tf.command != ATA_CMD_PACKET)
3621 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3623 /* make sure qc->err_mask is available to
3624 * know what's wrong and recover
3626 WARN_ON(qc->err_mask == 0);
3628 ap->hsm_task_state = HSM_ST_IDLE;
3630 ata_poll_qc_complete(qc);
3633 static void ata_pio_task(void *_data)
3635 struct ata_port *ap = _data;
3636 unsigned long timeout;
3643 switch (ap->hsm_task_state) {
3652 qc_completed = ata_pio_complete(ap);
3656 case HSM_ST_LAST_POLL:
3657 timeout = ata_pio_poll(ap);
3667 ata_port_queue_task(ap, ata_pio_task, ap, timeout);
3668 else if (!qc_completed)
3673 * atapi_packet_task - Write CDB bytes to hardware
3674 * @_data: Port to which ATAPI device is attached.
3676 * When device has indicated its readiness to accept
3677 * a CDB, this function is called. Send the CDB.
3678 * If DMA is to be performed, exit immediately.
3679 * Otherwise, we are in polling mode, so poll
3680 * status under operation succeeds or fails.
3683 * Kernel thread context (may sleep)
3686 static void atapi_packet_task(void *_data)
3688 struct ata_port *ap = _data;
3689 struct ata_queued_cmd *qc;
3692 qc = ata_qc_from_tag(ap, ap->active_tag);
3693 WARN_ON(qc == NULL);
3694 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3696 /* sleep-wait for BSY to clear */
3697 DPRINTK("busy wait\n");
3698 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3699 qc->err_mask |= AC_ERR_TIMEOUT;
3703 /* make sure DRQ is set */
3704 status = ata_chk_status(ap);
3705 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3706 qc->err_mask |= AC_ERR_HSM;
3711 DPRINTK("send cdb\n");
3712 WARN_ON(qc->dev->cdb_len < 12);
3714 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3715 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3716 unsigned long flags;
3718 /* Once we're done issuing command and kicking bmdma,
3719 * irq handler takes over. To not lose irq, we need
3720 * to clear NOINTR flag before sending cdb, but
3721 * interrupt handler shouldn't be invoked before we're
3722 * finished. Hence, the following locking.
3724 spin_lock_irqsave(&ap->host_set->lock, flags);
3725 ap->flags &= ~ATA_FLAG_NOINTR;
3726 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3727 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3728 ap->ops->bmdma_start(qc); /* initiate bmdma */
3729 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3731 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3733 /* PIO commands are handled by polling */
3734 ap->hsm_task_state = HSM_ST;
3735 ata_port_queue_task(ap, ata_pio_task, ap, 0);
3741 ata_poll_qc_complete(qc);
3745 * ata_qc_timeout - Handle timeout of queued command
3746 * @qc: Command that timed out
3748 * Some part of the kernel (currently, only the SCSI layer)
3749 * has noticed that the active command on port @ap has not
3750 * completed after a specified length of time. Handle this
3751 * condition by disabling DMA (if necessary) and completing
3752 * transactions, with error if necessary.
3754 * This also handles the case of the "lost interrupt", where
3755 * for some reason (possibly hardware bug, possibly driver bug)
3756 * an interrupt was not delivered to the driver, even though the
3757 * transaction completed successfully.
3760 * Inherited from SCSI layer (none, can sleep)
3763 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3765 struct ata_port *ap = qc->ap;
3766 struct ata_host_set *host_set = ap->host_set;
3767 u8 host_stat = 0, drv_stat;
3768 unsigned long flags;
3772 ap->hsm_task_state = HSM_ST_IDLE;
3774 spin_lock_irqsave(&host_set->lock, flags);
3776 switch (qc->tf.protocol) {
3779 case ATA_PROT_ATAPI_DMA:
3780 host_stat = ap->ops->bmdma_status(ap);
3782 /* before we do anything else, clear DMA-Start bit */
3783 ap->ops->bmdma_stop(qc);
3789 drv_stat = ata_chk_status(ap);
3791 /* ack bmdma irq events */
3792 ap->ops->irq_clear(ap);
3794 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3795 ap->id, qc->tf.command, drv_stat, host_stat);
3797 /* complete taskfile transaction */
3798 qc->err_mask |= ac_err_mask(drv_stat);
3802 spin_unlock_irqrestore(&host_set->lock, flags);
3804 ata_eh_qc_complete(qc);
3810 * ata_eng_timeout - Handle timeout of queued command
3811 * @ap: Port on which timed-out command is active
3813 * Some part of the kernel (currently, only the SCSI layer)
3814 * has noticed that the active command on port @ap has not
3815 * completed after a specified length of time. Handle this
3816 * condition by disabling DMA (if necessary) and completing
3817 * transactions, with error if necessary.
3819 * This also handles the case of the "lost interrupt", where
3820 * for some reason (possibly hardware bug, possibly driver bug)
3821 * an interrupt was not delivered to the driver, even though the
3822 * transaction completed successfully.
3825 * Inherited from SCSI layer (none, can sleep)
3828 void ata_eng_timeout(struct ata_port *ap)
3832 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3838 * ata_qc_new - Request an available ATA command, for queueing
3839 * @ap: Port associated with device @dev
3840 * @dev: Device from whom we request an available command structure
3846 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3848 struct ata_queued_cmd *qc = NULL;
3851 for (i = 0; i < ATA_MAX_QUEUE; i++)
3852 if (!test_and_set_bit(i, &ap->qactive)) {
3853 qc = ata_qc_from_tag(ap, i);
3864 * ata_qc_new_init - Request an available ATA command, and initialize it
3865 * @ap: Port associated with device @dev
3866 * @dev: Device from whom we request an available command structure
3872 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3873 struct ata_device *dev)
3875 struct ata_queued_cmd *qc;
3877 qc = ata_qc_new(ap);
3890 * ata_qc_free - free unused ata_queued_cmd
3891 * @qc: Command to complete
3893 * Designed to free unused ata_queued_cmd object
3894 * in case something prevents using it.
3897 * spin_lock_irqsave(host_set lock)
3899 void ata_qc_free(struct ata_queued_cmd *qc)
3901 struct ata_port *ap = qc->ap;
3904 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3908 if (likely(ata_tag_valid(tag))) {
3909 if (tag == ap->active_tag)
3910 ap->active_tag = ATA_TAG_POISON;
3911 qc->tag = ATA_TAG_POISON;
3912 clear_bit(tag, &ap->qactive);
3916 void __ata_qc_complete(struct ata_queued_cmd *qc)
3918 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3919 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3921 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3924 /* atapi: mark qc as inactive to prevent the interrupt handler
3925 * from completing the command twice later, before the error handler
3926 * is called. (when rc != 0 and atapi request sense is needed)
3928 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3930 /* call completion callback */
3931 qc->complete_fn(qc);
3934 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3936 struct ata_port *ap = qc->ap;
3938 switch (qc->tf.protocol) {
3940 case ATA_PROT_ATAPI_DMA:
3943 case ATA_PROT_ATAPI:
3945 if (ap->flags & ATA_FLAG_PIO_DMA)
3958 * ata_qc_issue - issue taskfile to device
3959 * @qc: command to issue to device
3961 * Prepare an ATA command to submission to device.
3962 * This includes mapping the data into a DMA-able
3963 * area, filling in the S/G table, and finally
3964 * writing the taskfile to hardware, starting the command.
3967 * spin_lock_irqsave(host_set lock)
3970 * Zero on success, AC_ERR_* mask on failure
3973 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
3975 struct ata_port *ap = qc->ap;
3977 if (ata_should_dma_map(qc)) {
3978 if (qc->flags & ATA_QCFLAG_SG) {
3979 if (ata_sg_setup(qc))
3981 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
3982 if (ata_sg_setup_one(qc))
3986 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3989 ap->ops->qc_prep(qc);
3991 qc->ap->active_tag = qc->tag;
3992 qc->flags |= ATA_QCFLAG_ACTIVE;
3994 return ap->ops->qc_issue(qc);
3997 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3998 return AC_ERR_SYSTEM;
4003 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4004 * @qc: command to issue to device
4006 * Using various libata functions and hooks, this function
4007 * starts an ATA command. ATA commands are grouped into
4008 * classes called "protocols", and issuing each type of protocol
4009 * is slightly different.
4011 * May be used as the qc_issue() entry in ata_port_operations.
4014 * spin_lock_irqsave(host_set lock)
4017 * Zero on success, AC_ERR_* mask on failure
4020 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4022 struct ata_port *ap = qc->ap;
4024 ata_dev_select(ap, qc->dev->devno, 1, 0);
4026 switch (qc->tf.protocol) {
4027 case ATA_PROT_NODATA:
4028 ata_tf_to_host(ap, &qc->tf);
4032 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4033 ap->ops->bmdma_setup(qc); /* set up bmdma */
4034 ap->ops->bmdma_start(qc); /* initiate bmdma */
4037 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4038 ata_qc_set_polling(qc);
4039 ata_tf_to_host(ap, &qc->tf);
4040 ap->hsm_task_state = HSM_ST;
4041 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4044 case ATA_PROT_ATAPI:
4045 ata_qc_set_polling(qc);
4046 ata_tf_to_host(ap, &qc->tf);
4047 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4050 case ATA_PROT_ATAPI_NODATA:
4051 ap->flags |= ATA_FLAG_NOINTR;
4052 ata_tf_to_host(ap, &qc->tf);
4053 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4056 case ATA_PROT_ATAPI_DMA:
4057 ap->flags |= ATA_FLAG_NOINTR;
4058 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4059 ap->ops->bmdma_setup(qc); /* set up bmdma */
4060 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4065 return AC_ERR_SYSTEM;
4072 * ata_host_intr - Handle host interrupt for given (port, task)
4073 * @ap: Port on which interrupt arrived (possibly...)
4074 * @qc: Taskfile currently active in engine
4076 * Handle host interrupt for given queued command. Currently,
4077 * only DMA interrupts are handled. All other commands are
4078 * handled via polling with interrupts disabled (nIEN bit).
4081 * spin_lock_irqsave(host_set lock)
4084 * One if interrupt was handled, zero if not (shared irq).
4087 inline unsigned int ata_host_intr (struct ata_port *ap,
4088 struct ata_queued_cmd *qc)
4090 u8 status, host_stat;
4092 switch (qc->tf.protocol) {
4095 case ATA_PROT_ATAPI_DMA:
4096 case ATA_PROT_ATAPI:
4097 /* check status of DMA engine */
4098 host_stat = ap->ops->bmdma_status(ap);
4099 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4101 /* if it's not our irq... */
4102 if (!(host_stat & ATA_DMA_INTR))
4105 /* before we do anything else, clear DMA-Start bit */
4106 ap->ops->bmdma_stop(qc);
4110 case ATA_PROT_ATAPI_NODATA:
4111 case ATA_PROT_NODATA:
4112 /* check altstatus */
4113 status = ata_altstatus(ap);
4114 if (status & ATA_BUSY)
4117 /* check main status, clearing INTRQ */
4118 status = ata_chk_status(ap);
4119 if (unlikely(status & ATA_BUSY))
4121 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4122 ap->id, qc->tf.protocol, status);
4124 /* ack bmdma irq events */
4125 ap->ops->irq_clear(ap);
4127 /* complete taskfile transaction */
4128 qc->err_mask |= ac_err_mask(status);
4129 ata_qc_complete(qc);
4136 return 1; /* irq handled */
4139 ap->stats.idle_irq++;
4142 if ((ap->stats.idle_irq % 1000) == 0) {
4143 ata_irq_ack(ap, 0); /* debug trap */
4144 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4148 return 0; /* irq not handled */
4152 * ata_interrupt - Default ATA host interrupt handler
4153 * @irq: irq line (unused)
4154 * @dev_instance: pointer to our ata_host_set information structure
4157 * Default interrupt handler for PCI IDE devices. Calls
4158 * ata_host_intr() for each port that is not disabled.
4161 * Obtains host_set lock during operation.
4164 * IRQ_NONE or IRQ_HANDLED.
4167 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4169 struct ata_host_set *host_set = dev_instance;
4171 unsigned int handled = 0;
4172 unsigned long flags;
4174 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4175 spin_lock_irqsave(&host_set->lock, flags);
4177 for (i = 0; i < host_set->n_ports; i++) {
4178 struct ata_port *ap;
4180 ap = host_set->ports[i];
4182 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4183 struct ata_queued_cmd *qc;
4185 qc = ata_qc_from_tag(ap, ap->active_tag);
4186 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4187 (qc->flags & ATA_QCFLAG_ACTIVE))
4188 handled |= ata_host_intr(ap, qc);
4192 spin_unlock_irqrestore(&host_set->lock, flags);
4194 return IRQ_RETVAL(handled);
4199 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4200 * without filling any other registers
4202 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4205 struct ata_taskfile tf;
4208 ata_tf_init(ap, &tf, dev->devno);
4211 tf.flags |= ATA_TFLAG_DEVICE;
4212 tf.protocol = ATA_PROT_NODATA;
4214 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4216 printk(KERN_ERR "%s: ata command failed: %d\n",
4222 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4226 if (!ata_try_flush_cache(dev))
4229 if (ata_id_has_flush_ext(dev->id))
4230 cmd = ATA_CMD_FLUSH_EXT;
4232 cmd = ATA_CMD_FLUSH;
4234 return ata_do_simple_cmd(ap, dev, cmd);
4237 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4239 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4242 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4244 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4248 * ata_device_resume - wakeup a previously suspended devices
4249 * @ap: port the device is connected to
4250 * @dev: the device to resume
4252 * Kick the drive back into action, by sending it an idle immediate
4253 * command and making sure its transfer mode matches between drive
4257 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4259 if (ap->flags & ATA_FLAG_SUSPENDED) {
4260 ap->flags &= ~ATA_FLAG_SUSPENDED;
4263 if (!ata_dev_present(dev))
4265 if (dev->class == ATA_DEV_ATA)
4266 ata_start_drive(ap, dev);
4272 * ata_device_suspend - prepare a device for suspend
4273 * @ap: port the device is connected to
4274 * @dev: the device to suspend
4276 * Flush the cache on the drive, if appropriate, then issue a
4277 * standbynow command.
4279 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev, pm_message_t state)
4281 if (!ata_dev_present(dev))
4283 if (dev->class == ATA_DEV_ATA)
4284 ata_flush_cache(ap, dev);
4286 if (state.event != PM_EVENT_FREEZE)
4287 ata_standby_drive(ap, dev);
4288 ap->flags |= ATA_FLAG_SUSPENDED;
4293 * ata_port_start - Set port up for dma.
4294 * @ap: Port to initialize
4296 * Called just after data structures for each port are
4297 * initialized. Allocates space for PRD table.
4299 * May be used as the port_start() entry in ata_port_operations.
4302 * Inherited from caller.
4305 int ata_port_start (struct ata_port *ap)
4307 struct device *dev = ap->dev;
4310 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4314 rc = ata_pad_alloc(ap, dev);
4316 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4320 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4327 * ata_port_stop - Undo ata_port_start()
4328 * @ap: Port to shut down
4330 * Frees the PRD table.
4332 * May be used as the port_stop() entry in ata_port_operations.
4335 * Inherited from caller.
4338 void ata_port_stop (struct ata_port *ap)
4340 struct device *dev = ap->dev;
4342 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4343 ata_pad_free(ap, dev);
4346 void ata_host_stop (struct ata_host_set *host_set)
4348 if (host_set->mmio_base)
4349 iounmap(host_set->mmio_base);
4354 * ata_host_remove - Unregister SCSI host structure with upper layers
4355 * @ap: Port to unregister
4356 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4359 * Inherited from caller.
4362 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4364 struct Scsi_Host *sh = ap->host;
4369 scsi_remove_host(sh);
4371 ap->ops->port_stop(ap);
4375 * ata_host_init - Initialize an ata_port structure
4376 * @ap: Structure to initialize
4377 * @host: associated SCSI mid-layer structure
4378 * @host_set: Collection of hosts to which @ap belongs
4379 * @ent: Probe information provided by low-level driver
4380 * @port_no: Port number associated with this ata_port
4382 * Initialize a new ata_port structure, and its associated
4386 * Inherited from caller.
4389 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4390 struct ata_host_set *host_set,
4391 const struct ata_probe_ent *ent, unsigned int port_no)
4397 host->max_channel = 1;
4398 host->unique_id = ata_unique_id++;
4399 host->max_cmd_len = 12;
4401 ap->flags = ATA_FLAG_PORT_DISABLED;
4402 ap->id = host->unique_id;
4404 ap->ctl = ATA_DEVCTL_OBS;
4405 ap->host_set = host_set;
4407 ap->port_no = port_no;
4409 ent->legacy_mode ? ent->hard_port_no : port_no;
4410 ap->pio_mask = ent->pio_mask;
4411 ap->mwdma_mask = ent->mwdma_mask;
4412 ap->udma_mask = ent->udma_mask;
4413 ap->flags |= ent->host_flags;
4414 ap->ops = ent->port_ops;
4415 ap->cbl = ATA_CBL_NONE;
4416 ap->active_tag = ATA_TAG_POISON;
4417 ap->last_ctl = 0xFF;
4419 INIT_WORK(&ap->port_task, NULL, NULL);
4420 INIT_LIST_HEAD(&ap->eh_done_q);
4422 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4423 struct ata_device *dev = &ap->device[i];
4425 dev->pio_mask = UINT_MAX;
4426 dev->mwdma_mask = UINT_MAX;
4427 dev->udma_mask = UINT_MAX;
4431 ap->stats.unhandled_irq = 1;
4432 ap->stats.idle_irq = 1;
4435 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4439 * ata_host_add - Attach low-level ATA driver to system
4440 * @ent: Information provided by low-level driver
4441 * @host_set: Collections of ports to which we add
4442 * @port_no: Port number associated with this host
4444 * Attach low-level ATA driver to system.
4447 * PCI/etc. bus probe sem.
4450 * New ata_port on success, for NULL on error.
4453 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4454 struct ata_host_set *host_set,
4455 unsigned int port_no)
4457 struct Scsi_Host *host;
4458 struct ata_port *ap;
4463 if (!ent->port_ops->probe_reset &&
4464 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
4465 printk(KERN_ERR "ata%u: no reset mechanism available\n",
4470 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4474 host->transportt = &ata_scsi_transport_template;
4476 ap = (struct ata_port *) &host->hostdata[0];
4478 ata_host_init(ap, host, host_set, ent, port_no);
4480 rc = ap->ops->port_start(ap);
4487 scsi_host_put(host);
4492 * ata_device_add - Register hardware device with ATA and SCSI layers
4493 * @ent: Probe information describing hardware device to be registered
4495 * This function processes the information provided in the probe
4496 * information struct @ent, allocates the necessary ATA and SCSI
4497 * host information structures, initializes them, and registers
4498 * everything with requisite kernel subsystems.
4500 * This function requests irqs, probes the ATA bus, and probes
4504 * PCI/etc. bus probe sem.
4507 * Number of ports registered. Zero on error (no ports registered).
4510 int ata_device_add(const struct ata_probe_ent *ent)
4512 unsigned int count = 0, i;
4513 struct device *dev = ent->dev;
4514 struct ata_host_set *host_set;
4517 /* alloc a container for our list of ATA ports (buses) */
4518 host_set = kzalloc(sizeof(struct ata_host_set) +
4519 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4522 spin_lock_init(&host_set->lock);
4524 host_set->dev = dev;
4525 host_set->n_ports = ent->n_ports;
4526 host_set->irq = ent->irq;
4527 host_set->mmio_base = ent->mmio_base;
4528 host_set->private_data = ent->private_data;
4529 host_set->ops = ent->port_ops;
4531 /* register each port bound to this device */
4532 for (i = 0; i < ent->n_ports; i++) {
4533 struct ata_port *ap;
4534 unsigned long xfer_mode_mask;
4536 ap = ata_host_add(ent, host_set, i);
4540 host_set->ports[i] = ap;
4541 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4542 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4543 (ap->pio_mask << ATA_SHIFT_PIO);
4545 /* print per-port info to dmesg */
4546 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4547 "bmdma 0x%lX irq %lu\n",
4549 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4550 ata_mode_string(xfer_mode_mask),
4551 ap->ioaddr.cmd_addr,
4552 ap->ioaddr.ctl_addr,
4553 ap->ioaddr.bmdma_addr,
4557 host_set->ops->irq_clear(ap);
4564 /* obtain irq, that is shared between channels */
4565 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4566 DRV_NAME, host_set))
4569 /* perform each probe synchronously */
4570 DPRINTK("probe begin\n");
4571 for (i = 0; i < count; i++) {
4572 struct ata_port *ap;
4575 ap = host_set->ports[i];
4577 DPRINTK("ata%u: bus probe begin\n", ap->id);
4578 rc = ata_bus_probe(ap);
4579 DPRINTK("ata%u: bus probe end\n", ap->id);
4582 /* FIXME: do something useful here?
4583 * Current libata behavior will
4584 * tear down everything when
4585 * the module is removed
4586 * or the h/w is unplugged.
4590 rc = scsi_add_host(ap->host, dev);
4592 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4594 /* FIXME: do something useful here */
4595 /* FIXME: handle unconditional calls to
4596 * scsi_scan_host and ata_host_remove, below,
4602 /* probes are done, now scan each port's disk(s) */
4603 DPRINTK("host probe begin\n");
4604 for (i = 0; i < count; i++) {
4605 struct ata_port *ap = host_set->ports[i];
4607 ata_scsi_scan_host(ap);
4610 dev_set_drvdata(dev, host_set);
4612 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4613 return ent->n_ports; /* success */
4616 for (i = 0; i < count; i++) {
4617 ata_host_remove(host_set->ports[i], 1);
4618 scsi_host_put(host_set->ports[i]->host);
4622 VPRINTK("EXIT, returning 0\n");
4627 * ata_host_set_remove - PCI layer callback for device removal
4628 * @host_set: ATA host set that was removed
4630 * Unregister all objects associated with this host set. Free those
4634 * Inherited from calling layer (may sleep).
4637 void ata_host_set_remove(struct ata_host_set *host_set)
4639 struct ata_port *ap;
4642 for (i = 0; i < host_set->n_ports; i++) {
4643 ap = host_set->ports[i];
4644 scsi_remove_host(ap->host);
4647 free_irq(host_set->irq, host_set);
4649 for (i = 0; i < host_set->n_ports; i++) {
4650 ap = host_set->ports[i];
4652 ata_scsi_release(ap->host);
4654 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4655 struct ata_ioports *ioaddr = &ap->ioaddr;
4657 if (ioaddr->cmd_addr == 0x1f0)
4658 release_region(0x1f0, 8);
4659 else if (ioaddr->cmd_addr == 0x170)
4660 release_region(0x170, 8);
4663 scsi_host_put(ap->host);
4666 if (host_set->ops->host_stop)
4667 host_set->ops->host_stop(host_set);
4673 * ata_scsi_release - SCSI layer callback hook for host unload
4674 * @host: libata host to be unloaded
4676 * Performs all duties necessary to shut down a libata port...
4677 * Kill port kthread, disable port, and release resources.
4680 * Inherited from SCSI layer.
4686 int ata_scsi_release(struct Scsi_Host *host)
4688 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4693 ap->ops->port_disable(ap);
4694 ata_host_remove(ap, 0);
4695 for (i = 0; i < ATA_MAX_DEVICES; i++)
4696 kfree(ap->device[i].id);
4703 * ata_std_ports - initialize ioaddr with standard port offsets.
4704 * @ioaddr: IO address structure to be initialized
4706 * Utility function which initializes data_addr, error_addr,
4707 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4708 * device_addr, status_addr, and command_addr to standard offsets
4709 * relative to cmd_addr.
4711 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4714 void ata_std_ports(struct ata_ioports *ioaddr)
4716 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4717 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4718 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4719 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4720 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4721 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4722 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4723 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4724 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4725 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4731 void ata_pci_host_stop (struct ata_host_set *host_set)
4733 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4735 pci_iounmap(pdev, host_set->mmio_base);
4739 * ata_pci_remove_one - PCI layer callback for device removal
4740 * @pdev: PCI device that was removed
4742 * PCI layer indicates to libata via this hook that
4743 * hot-unplug or module unload event has occurred.
4744 * Handle this by unregistering all objects associated
4745 * with this PCI device. Free those objects. Then finally
4746 * release PCI resources and disable device.
4749 * Inherited from PCI layer (may sleep).
4752 void ata_pci_remove_one (struct pci_dev *pdev)
4754 struct device *dev = pci_dev_to_dev(pdev);
4755 struct ata_host_set *host_set = dev_get_drvdata(dev);
4757 ata_host_set_remove(host_set);
4758 pci_release_regions(pdev);
4759 pci_disable_device(pdev);
4760 dev_set_drvdata(dev, NULL);
4763 /* move to PCI subsystem */
4764 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4766 unsigned long tmp = 0;
4768 switch (bits->width) {
4771 pci_read_config_byte(pdev, bits->reg, &tmp8);
4777 pci_read_config_word(pdev, bits->reg, &tmp16);
4783 pci_read_config_dword(pdev, bits->reg, &tmp32);
4794 return (tmp == bits->val) ? 1 : 0;
4797 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4799 pci_save_state(pdev);
4800 pci_disable_device(pdev);
4801 pci_set_power_state(pdev, PCI_D3hot);
4805 int ata_pci_device_resume(struct pci_dev *pdev)
4807 pci_set_power_state(pdev, PCI_D0);
4808 pci_restore_state(pdev);
4809 pci_enable_device(pdev);
4810 pci_set_master(pdev);
4813 #endif /* CONFIG_PCI */
4816 static int __init ata_init(void)
4818 ata_wq = create_workqueue("ata");
4822 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4826 static void __exit ata_exit(void)
4828 destroy_workqueue(ata_wq);
4831 module_init(ata_init);
4832 module_exit(ata_exit);
4834 static unsigned long ratelimit_time;
4835 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4837 int ata_ratelimit(void)
4840 unsigned long flags;
4842 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4844 if (time_after(jiffies, ratelimit_time)) {
4846 ratelimit_time = jiffies + (HZ/5);
4850 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4856 * libata is essentially a library of internal helper functions for
4857 * low-level ATA host controller drivers. As such, the API/ABI is
4858 * likely to change as new drivers are added and updated.
4859 * Do not depend on ABI/API stability.
4862 EXPORT_SYMBOL_GPL(ata_std_bios_param);
4863 EXPORT_SYMBOL_GPL(ata_std_ports);
4864 EXPORT_SYMBOL_GPL(ata_device_add);
4865 EXPORT_SYMBOL_GPL(ata_host_set_remove);
4866 EXPORT_SYMBOL_GPL(ata_sg_init);
4867 EXPORT_SYMBOL_GPL(ata_sg_init_one);
4868 EXPORT_SYMBOL_GPL(__ata_qc_complete);
4869 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4870 EXPORT_SYMBOL_GPL(ata_eng_timeout);
4871 EXPORT_SYMBOL_GPL(ata_tf_load);
4872 EXPORT_SYMBOL_GPL(ata_tf_read);
4873 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4874 EXPORT_SYMBOL_GPL(ata_std_dev_select);
4875 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4876 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4877 EXPORT_SYMBOL_GPL(ata_check_status);
4878 EXPORT_SYMBOL_GPL(ata_altstatus);
4879 EXPORT_SYMBOL_GPL(ata_exec_command);
4880 EXPORT_SYMBOL_GPL(ata_port_start);
4881 EXPORT_SYMBOL_GPL(ata_port_stop);
4882 EXPORT_SYMBOL_GPL(ata_host_stop);
4883 EXPORT_SYMBOL_GPL(ata_interrupt);
4884 EXPORT_SYMBOL_GPL(ata_qc_prep);
4885 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
4886 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4887 EXPORT_SYMBOL_GPL(ata_bmdma_start);
4888 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4889 EXPORT_SYMBOL_GPL(ata_bmdma_status);
4890 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4891 EXPORT_SYMBOL_GPL(ata_port_probe);
4892 EXPORT_SYMBOL_GPL(sata_phy_reset);
4893 EXPORT_SYMBOL_GPL(__sata_phy_reset);
4894 EXPORT_SYMBOL_GPL(ata_bus_reset);
4895 EXPORT_SYMBOL_GPL(ata_std_probeinit);
4896 EXPORT_SYMBOL_GPL(ata_std_softreset);
4897 EXPORT_SYMBOL_GPL(sata_std_hardreset);
4898 EXPORT_SYMBOL_GPL(ata_std_postreset);
4899 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
4900 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
4901 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
4902 EXPORT_SYMBOL_GPL(ata_dev_classify);
4903 EXPORT_SYMBOL_GPL(ata_dev_pair);
4904 EXPORT_SYMBOL_GPL(ata_port_disable);
4905 EXPORT_SYMBOL_GPL(ata_ratelimit);
4906 EXPORT_SYMBOL_GPL(ata_busy_sleep);
4907 EXPORT_SYMBOL_GPL(ata_port_queue_task);
4908 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
4909 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4910 EXPORT_SYMBOL_GPL(ata_scsi_error);
4911 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
4912 EXPORT_SYMBOL_GPL(ata_scsi_release);
4913 EXPORT_SYMBOL_GPL(ata_host_intr);
4914 EXPORT_SYMBOL_GPL(ata_id_string);
4915 EXPORT_SYMBOL_GPL(ata_id_c_string);
4916 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
4917 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
4918 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
4920 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
4921 EXPORT_SYMBOL_GPL(ata_timing_compute);
4922 EXPORT_SYMBOL_GPL(ata_timing_merge);
4925 EXPORT_SYMBOL_GPL(pci_test_config_bits);
4926 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
4927 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
4928 EXPORT_SYMBOL_GPL(ata_pci_init_one);
4929 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
4930 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
4931 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
4932 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
4933 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
4934 #endif /* CONFIG_PCI */
4936 EXPORT_SYMBOL_GPL(ata_device_suspend);
4937 EXPORT_SYMBOL_GPL(ata_device_resume);
4938 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
4939 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);