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 void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
68 static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift);
69 static int fgb(u32 bitmap);
70 static int ata_choose_xfer_mode(const struct ata_port *ap,
72 unsigned int *xfer_shift_out);
73 static void ata_pio_error(struct ata_port *ap);
75 static unsigned int ata_unique_id = 1;
76 static struct workqueue_struct *ata_wq;
78 int atapi_enabled = 0;
79 module_param(atapi_enabled, int, 0444);
80 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (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];
231 static const char * const xfer_mode_str[] = {
251 * ata_udma_string - convert UDMA bit offset to string
252 * @mask: mask of bits supported; only highest bit counts.
254 * Determine string which represents the highest speed
255 * (highest bit in @udma_mask).
261 * Constant C string representing highest speed listed in
262 * @udma_mask, or the constant C string "<n/a>".
265 static const char *ata_mode_string(unsigned int mask)
269 for (i = 7; i >= 0; i--)
272 for (i = ATA_SHIFT_MWDMA + 2; i >= ATA_SHIFT_MWDMA; i--)
275 for (i = ATA_SHIFT_PIO + 4; i >= ATA_SHIFT_PIO; i--)
282 return xfer_mode_str[i];
286 * ata_pio_devchk - PATA device presence detection
287 * @ap: ATA channel to examine
288 * @device: Device to examine (starting at zero)
290 * This technique was originally described in
291 * Hale Landis's ATADRVR (www.ata-atapi.com), and
292 * later found its way into the ATA/ATAPI spec.
294 * Write a pattern to the ATA shadow registers,
295 * and if a device is present, it will respond by
296 * correctly storing and echoing back the
297 * ATA shadow register contents.
303 static unsigned int ata_pio_devchk(struct ata_port *ap,
306 struct ata_ioports *ioaddr = &ap->ioaddr;
309 ap->ops->dev_select(ap, device);
311 outb(0x55, ioaddr->nsect_addr);
312 outb(0xaa, ioaddr->lbal_addr);
314 outb(0xaa, ioaddr->nsect_addr);
315 outb(0x55, ioaddr->lbal_addr);
317 outb(0x55, ioaddr->nsect_addr);
318 outb(0xaa, ioaddr->lbal_addr);
320 nsect = inb(ioaddr->nsect_addr);
321 lbal = inb(ioaddr->lbal_addr);
323 if ((nsect == 0x55) && (lbal == 0xaa))
324 return 1; /* we found a device */
326 return 0; /* nothing found */
330 * ata_mmio_devchk - PATA device presence detection
331 * @ap: ATA channel to examine
332 * @device: Device to examine (starting at zero)
334 * This technique was originally described in
335 * Hale Landis's ATADRVR (www.ata-atapi.com), and
336 * later found its way into the ATA/ATAPI spec.
338 * Write a pattern to the ATA shadow registers,
339 * and if a device is present, it will respond by
340 * correctly storing and echoing back the
341 * ATA shadow register contents.
347 static unsigned int ata_mmio_devchk(struct ata_port *ap,
350 struct ata_ioports *ioaddr = &ap->ioaddr;
353 ap->ops->dev_select(ap, device);
355 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
356 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
358 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
359 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
361 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
362 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
364 nsect = readb((void __iomem *) ioaddr->nsect_addr);
365 lbal = readb((void __iomem *) ioaddr->lbal_addr);
367 if ((nsect == 0x55) && (lbal == 0xaa))
368 return 1; /* we found a device */
370 return 0; /* nothing found */
374 * ata_devchk - PATA device presence detection
375 * @ap: ATA channel to examine
376 * @device: Device to examine (starting at zero)
378 * Dispatch ATA device presence detection, depending
379 * on whether we are using PIO or MMIO to talk to the
380 * ATA shadow registers.
386 static unsigned int ata_devchk(struct ata_port *ap,
389 if (ap->flags & ATA_FLAG_MMIO)
390 return ata_mmio_devchk(ap, device);
391 return ata_pio_devchk(ap, device);
395 * ata_dev_classify - determine device type based on ATA-spec signature
396 * @tf: ATA taskfile register set for device to be identified
398 * Determine from taskfile register contents whether a device is
399 * ATA or ATAPI, as per "Signature and persistence" section
400 * of ATA/PI spec (volume 1, sect 5.14).
406 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
407 * the event of failure.
410 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
412 /* Apple's open source Darwin code hints that some devices only
413 * put a proper signature into the LBA mid/high registers,
414 * So, we only check those. It's sufficient for uniqueness.
417 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
418 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
419 DPRINTK("found ATA device by sig\n");
423 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
424 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
425 DPRINTK("found ATAPI device by sig\n");
426 return ATA_DEV_ATAPI;
429 DPRINTK("unknown device\n");
430 return ATA_DEV_UNKNOWN;
434 * ata_dev_try_classify - Parse returned ATA device signature
435 * @ap: ATA channel to examine
436 * @device: Device to examine (starting at zero)
437 * @r_err: Value of error register on completion
439 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
440 * an ATA/ATAPI-defined set of values is placed in the ATA
441 * shadow registers, indicating the results of device detection
444 * Select the ATA device, and read the values from the ATA shadow
445 * registers. Then parse according to the Error register value,
446 * and the spec-defined values examined by ata_dev_classify().
452 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
456 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
458 struct ata_taskfile tf;
462 ap->ops->dev_select(ap, device);
464 memset(&tf, 0, sizeof(tf));
466 ap->ops->tf_read(ap, &tf);
471 /* see if device passed diags */
474 else if ((device == 0) && (err == 0x81))
479 /* determine if device is ATA or ATAPI */
480 class = ata_dev_classify(&tf);
482 if (class == ATA_DEV_UNKNOWN)
484 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
490 * ata_id_string - Convert IDENTIFY DEVICE page into string
491 * @id: IDENTIFY DEVICE results we will examine
492 * @s: string into which data is output
493 * @ofs: offset into identify device page
494 * @len: length of string to return. must be an even number.
496 * The strings in the IDENTIFY DEVICE page are broken up into
497 * 16-bit chunks. Run through the string, and output each
498 * 8-bit chunk linearly, regardless of platform.
504 void ata_id_string(const u16 *id, unsigned char *s,
505 unsigned int ofs, unsigned int len)
524 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
525 * @id: IDENTIFY DEVICE results we will examine
526 * @s: string into which data is output
527 * @ofs: offset into identify device page
528 * @len: length of string to return. must be an odd number.
530 * This function is identical to ata_id_string except that it
531 * trims trailing spaces and terminates the resulting string with
532 * null. @len must be actual maximum length (even number) + 1.
537 void ata_id_c_string(const u16 *id, unsigned char *s,
538 unsigned int ofs, unsigned int len)
544 ata_id_string(id, s, ofs, len - 1);
546 p = s + strnlen(s, len - 1);
547 while (p > s && p[-1] == ' ')
552 static u64 ata_id_n_sectors(const u16 *id)
554 if (ata_id_has_lba(id)) {
555 if (ata_id_has_lba48(id))
556 return ata_id_u64(id, 100);
558 return ata_id_u32(id, 60);
560 if (ata_id_current_chs_valid(id))
561 return ata_id_u32(id, 57);
563 return id[1] * id[3] * id[6];
568 * ata_noop_dev_select - Select device 0/1 on ATA bus
569 * @ap: ATA channel to manipulate
570 * @device: ATA device (numbered from zero) to select
572 * This function performs no actual function.
574 * May be used as the dev_select() entry in ata_port_operations.
579 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
585 * ata_std_dev_select - Select device 0/1 on ATA bus
586 * @ap: ATA channel to manipulate
587 * @device: ATA device (numbered from zero) to select
589 * Use the method defined in the ATA specification to
590 * make either device 0, or device 1, active on the
591 * ATA channel. Works with both PIO and MMIO.
593 * May be used as the dev_select() entry in ata_port_operations.
599 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
604 tmp = ATA_DEVICE_OBS;
606 tmp = ATA_DEVICE_OBS | ATA_DEV1;
608 if (ap->flags & ATA_FLAG_MMIO) {
609 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
611 outb(tmp, ap->ioaddr.device_addr);
613 ata_pause(ap); /* needed; also flushes, for mmio */
617 * ata_dev_select - Select device 0/1 on ATA bus
618 * @ap: ATA channel to manipulate
619 * @device: ATA device (numbered from zero) to select
620 * @wait: non-zero to wait for Status register BSY bit to clear
621 * @can_sleep: non-zero if context allows sleeping
623 * Use the method defined in the ATA specification to
624 * make either device 0, or device 1, active on the
627 * This is a high-level version of ata_std_dev_select(),
628 * which additionally provides the services of inserting
629 * the proper pauses and status polling, where needed.
635 void ata_dev_select(struct ata_port *ap, unsigned int device,
636 unsigned int wait, unsigned int can_sleep)
638 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
639 ap->id, device, wait);
644 ap->ops->dev_select(ap, device);
647 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
654 * ata_dump_id - IDENTIFY DEVICE info debugging output
655 * @id: IDENTIFY DEVICE page to dump
657 * Dump selected 16-bit words from the given IDENTIFY DEVICE
664 static inline void ata_dump_id(const u16 *id)
666 DPRINTK("49==0x%04x "
676 DPRINTK("80==0x%04x "
686 DPRINTK("88==0x%04x "
693 * Compute the PIO modes available for this device. This is not as
694 * trivial as it seems if we must consider early devices correctly.
696 * FIXME: pre IDE drive timing (do we care ?).
699 static unsigned int ata_pio_modes(const struct ata_device *adev)
703 /* Usual case. Word 53 indicates word 64 is valid */
704 if (adev->id[ATA_ID_FIELD_VALID] & (1 << 1)) {
705 modes = adev->id[ATA_ID_PIO_MODES] & 0x03;
711 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
712 number for the maximum. Turn it into a mask and return it */
713 modes = (2 << ((adev->id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF)) - 1 ;
715 /* But wait.. there's more. Design your standards by committee and
716 you too can get a free iordy field to process. However its the
717 speeds not the modes that are supported... Note drivers using the
718 timing API will get this right anyway */
722 ata_queue_pio_task(struct ata_port *ap)
724 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
725 queue_work(ata_wq, &ap->pio_task);
729 ata_queue_delayed_pio_task(struct ata_port *ap, unsigned long delay)
731 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
732 queue_delayed_work(ata_wq, &ap->pio_task, delay);
736 * ata_flush_pio_tasks - Flush pio_task
737 * @ap: the target ata_port
739 * After this function completes, pio_task is
740 * guranteed not to be running or scheduled.
743 * Kernel thread context (may sleep)
746 static void ata_flush_pio_tasks(struct ata_port *ap)
753 spin_lock_irqsave(&ap->host_set->lock, flags);
754 ap->flags |= ATA_FLAG_FLUSH_PIO_TASK;
755 spin_unlock_irqrestore(&ap->host_set->lock, flags);
757 DPRINTK("flush #1\n");
758 flush_workqueue(ata_wq);
761 * At this point, if a task is running, it's guaranteed to see
762 * the FLUSH flag; thus, it will never queue pio tasks again.
765 tmp |= cancel_delayed_work(&ap->pio_task);
767 DPRINTK("flush #2\n");
768 flush_workqueue(ata_wq);
771 spin_lock_irqsave(&ap->host_set->lock, flags);
772 ap->flags &= ~ATA_FLAG_FLUSH_PIO_TASK;
773 spin_unlock_irqrestore(&ap->host_set->lock, flags);
778 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
780 struct completion *waiting = qc->private_data;
782 qc->ap->ops->tf_read(qc->ap, &qc->tf);
787 * ata_exec_internal - execute libata internal command
788 * @ap: Port to which the command is sent
789 * @dev: Device to which the command is sent
790 * @tf: Taskfile registers for the command and the result
791 * @dma_dir: Data tranfer direction of the command
792 * @buf: Data buffer of the command
793 * @buflen: Length of data buffer
795 * Executes libata internal command with timeout. @tf contains
796 * command on entry and result on return. Timeout and error
797 * conditions are reported via return value. No recovery action
798 * is taken after a command times out. It's caller's duty to
799 * clean up after timeout.
802 * None. Should be called with kernel context, might sleep.
806 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
807 struct ata_taskfile *tf,
808 int dma_dir, void *buf, unsigned int buflen)
810 u8 command = tf->command;
811 struct ata_queued_cmd *qc;
812 DECLARE_COMPLETION(wait);
814 unsigned int err_mask;
816 spin_lock_irqsave(&ap->host_set->lock, flags);
818 qc = ata_qc_new_init(ap, dev);
822 qc->dma_dir = dma_dir;
823 if (dma_dir != DMA_NONE) {
824 ata_sg_init_one(qc, buf, buflen);
825 qc->nsect = buflen / ATA_SECT_SIZE;
828 qc->private_data = &wait;
829 qc->complete_fn = ata_qc_complete_internal;
831 qc->err_mask = ata_qc_issue(qc);
835 spin_unlock_irqrestore(&ap->host_set->lock, flags);
837 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
838 spin_lock_irqsave(&ap->host_set->lock, flags);
840 /* We're racing with irq here. If we lose, the
841 * following test prevents us from completing the qc
842 * again. If completion irq occurs after here but
843 * before the caller cleans up, it will result in a
844 * spurious interrupt. We can live with that.
846 if (qc->flags & ATA_QCFLAG_ACTIVE) {
847 qc->err_mask = AC_ERR_TIMEOUT;
849 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
853 spin_unlock_irqrestore(&ap->host_set->lock, flags);
857 err_mask = qc->err_mask;
865 * ata_pio_need_iordy - check if iordy needed
868 * Check if the current speed of the device requires IORDY. Used
869 * by various controllers for chip configuration.
872 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
875 int speed = adev->pio_mode - XFER_PIO_0;
882 /* If we have no drive specific rule, then PIO 2 is non IORDY */
884 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
885 pio = adev->id[ATA_ID_EIDE_PIO];
886 /* Is the speed faster than the drive allows non IORDY ? */
888 /* This is cycle times not frequency - watch the logic! */
889 if (pio > 240) /* PIO2 is 240nS per cycle */
898 * ata_dev_read_id - Read ID data from the specified device
899 * @ap: port on which target device resides
900 * @dev: target device
901 * @p_class: pointer to class of the target device (may be changed)
902 * @post_reset: is this read ID post-reset?
903 * @id: buffer to fill IDENTIFY page into
905 * Read ID data from the specified device. ATA_CMD_ID_ATA is
906 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
907 * devices. This function also takes care of EDD signature
908 * misreporting (to be removed once EDD support is gone) and
909 * issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
912 * Kernel thread context (may sleep)
915 * 0 on success, -errno otherwise.
917 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
918 unsigned int *p_class, int post_reset, u16 *id)
920 unsigned int class = *p_class;
921 unsigned int using_edd;
922 struct ata_taskfile tf;
923 unsigned int err_mask = 0;
927 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
929 if (ap->ops->probe_reset ||
930 ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
935 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
938 ata_tf_init(ap, &tf, dev->devno);
942 tf.command = ATA_CMD_ID_ATA;
945 tf.command = ATA_CMD_ID_ATAPI;
949 reason = "unsupported class";
953 tf.protocol = ATA_PROT_PIO;
955 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
956 id, sizeof(id[0]) * ATA_ID_WORDS);
960 reason = "I/O error";
962 if (err_mask & ~AC_ERR_DEV)
966 * arg! EDD works for all test cases, but seems to return
967 * the ATA signature for some ATAPI devices. Until the
968 * reason for this is found and fixed, we fix up the mess
969 * here. If IDENTIFY DEVICE returns command aborted
970 * (as ATAPI devices do), then we issue an
971 * IDENTIFY PACKET DEVICE.
973 * ATA software reset (SRST, the default) does not appear
974 * to have this problem.
976 if ((using_edd) && (class == ATA_DEV_ATA)) {
978 if (err & ATA_ABORTED) {
979 class = ATA_DEV_ATAPI;
986 swap_buf_le16(id, ATA_ID_WORDS);
988 /* print device capabilities */
989 printk(KERN_DEBUG "ata%u: dev %u cfg "
990 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
992 id[49], id[82], id[83], id[84], id[85], id[86], id[87], id[88]);
995 if ((class == ATA_DEV_ATA) != ata_id_is_ata(id)) {
997 reason = "device reports illegal type";
1001 if (post_reset && class == ATA_DEV_ATA) {
1003 * The exact sequence expected by certain pre-ATA4 drives is:
1006 * INITIALIZE DEVICE PARAMETERS
1008 * Some drives were very specific about that exact sequence.
1010 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1011 err_mask = ata_dev_init_params(ap, dev);
1014 reason = "INIT_DEV_PARAMS failed";
1018 /* current CHS translation info (id[53-58]) might be
1019 * changed. reread the identify device info.
1030 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1031 ap->id, dev->devno, reason);
1037 * ata_dev_identify - obtain IDENTIFY x DEVICE page
1038 * @ap: port on which device we wish to probe resides
1039 * @device: device bus address, starting at zero
1041 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
1042 * command, and read back the 512-byte device information page.
1043 * The device information page is fed to us via the standard
1044 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
1045 * using standard PIO-IN paths)
1047 * After reading the device information page, we use several
1048 * bits of information from it to initialize data structures
1049 * that will be used during the lifetime of the ata_device.
1050 * Other data from the info page is used to disqualify certain
1051 * older ATA devices we do not wish to support.
1054 * Inherited from caller. Some functions called by this function
1055 * obtain the host_set lock.
1058 static void ata_dev_identify(struct ata_port *ap, unsigned int device)
1060 struct ata_device *dev = &ap->device[device];
1061 unsigned long xfer_modes;
1064 if (!ata_dev_present(dev)) {
1065 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1070 DPRINTK("ENTER, host %u, dev %u\n", ap->id, device);
1072 rc = ata_dev_read_id(ap, dev, &dev->class, 1, dev->id);
1077 * common ATA, ATAPI feature tests
1080 /* we require DMA support (bits 8 of word 49) */
1081 if (!ata_id_has_dma(dev->id)) {
1082 printk(KERN_DEBUG "ata%u: no dma\n", ap->id);
1086 /* quick-n-dirty find max transfer mode; for printk only */
1087 xfer_modes = dev->id[ATA_ID_UDMA_MODES];
1089 xfer_modes = (dev->id[ATA_ID_MWDMA_MODES]) << ATA_SHIFT_MWDMA;
1091 xfer_modes = ata_pio_modes(dev);
1093 ata_dump_id(dev->id);
1095 /* ATA-specific feature tests */
1096 if (dev->class == ATA_DEV_ATA) {
1097 dev->n_sectors = ata_id_n_sectors(dev->id);
1099 if (ata_id_has_lba(dev->id)) {
1100 dev->flags |= ATA_DFLAG_LBA;
1102 if (ata_id_has_lba48(dev->id))
1103 dev->flags |= ATA_DFLAG_LBA48;
1105 /* print device info to dmesg */
1106 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1108 ata_id_major_version(dev->id),
1109 ata_mode_string(xfer_modes),
1110 (unsigned long long)dev->n_sectors,
1111 dev->flags & ATA_DFLAG_LBA48 ? " LBA48" : " LBA");
1115 /* Default translation */
1116 dev->cylinders = dev->id[1];
1117 dev->heads = dev->id[3];
1118 dev->sectors = dev->id[6];
1120 if (ata_id_current_chs_valid(dev->id)) {
1121 /* Current CHS translation is valid. */
1122 dev->cylinders = dev->id[54];
1123 dev->heads = dev->id[55];
1124 dev->sectors = dev->id[56];
1127 /* print device info to dmesg */
1128 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1130 ata_id_major_version(dev->id),
1131 ata_mode_string(xfer_modes),
1132 (unsigned long long)dev->n_sectors,
1133 (int)dev->cylinders, (int)dev->heads, (int)dev->sectors);
1137 if (dev->id[59] & 0x100) {
1138 dev->multi_count = dev->id[59] & 0xff;
1139 DPRINTK("ata%u: dev %u multi count %u\n",
1140 ap->id, device, dev->multi_count);
1145 /* ATAPI-specific feature tests */
1146 else if (dev->class == ATA_DEV_ATAPI) {
1147 rc = atapi_cdb_len(dev->id);
1148 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1149 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1152 dev->cdb_len = (unsigned int) rc;
1154 if (ata_id_cdb_intr(dev->id))
1155 dev->flags |= ATA_DFLAG_CDB_INTR;
1157 /* print device info to dmesg */
1158 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1160 ata_mode_string(xfer_modes));
1163 ap->host->max_cmd_len = 0;
1164 for (i = 0; i < ATA_MAX_DEVICES; i++)
1165 ap->host->max_cmd_len = max_t(unsigned int,
1166 ap->host->max_cmd_len,
1167 ap->device[i].cdb_len);
1169 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1173 printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
1176 dev->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1177 DPRINTK("EXIT, err\n");
1181 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1182 struct ata_device *dev)
1184 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1188 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1195 void ata_dev_config(struct ata_port *ap, unsigned int i)
1197 /* limit bridge transfers to udma5, 200 sectors */
1198 if (ata_dev_knobble(ap, &ap->device[i])) {
1199 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1201 ap->udma_mask &= ATA_UDMA5;
1202 ap->device[i].max_sectors = ATA_MAX_SECTORS;
1205 if (ap->ops->dev_config)
1206 ap->ops->dev_config(ap, &ap->device[i]);
1210 * ata_bus_probe - Reset and probe ATA bus
1213 * Master ATA bus probing function. Initiates a hardware-dependent
1214 * bus reset, then attempts to identify any devices found on
1218 * PCI/etc. bus probe sem.
1221 * Zero on success, non-zero on error.
1224 static int ata_bus_probe(struct ata_port *ap)
1226 unsigned int i, found = 0;
1228 if (ap->ops->probe_reset) {
1229 unsigned int classes[ATA_MAX_DEVICES];
1234 rc = ap->ops->probe_reset(ap, classes);
1236 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1237 if (classes[i] == ATA_DEV_UNKNOWN)
1238 classes[i] = ATA_DEV_NONE;
1239 ap->device[i].class = classes[i];
1242 printk(KERN_ERR "ata%u: probe reset failed, "
1243 "disabling port\n", ap->id);
1244 ata_port_disable(ap);
1247 ap->ops->phy_reset(ap);
1249 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1252 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1253 ata_dev_identify(ap, i);
1254 if (ata_dev_present(&ap->device[i])) {
1256 ata_dev_config(ap,i);
1260 if ((!found) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1261 goto err_out_disable;
1264 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1265 goto err_out_disable;
1270 ap->ops->port_disable(ap);
1276 * ata_port_probe - Mark port as enabled
1277 * @ap: Port for which we indicate enablement
1279 * Modify @ap data structure such that the system
1280 * thinks that the entire port is enabled.
1282 * LOCKING: host_set lock, or some other form of
1286 void ata_port_probe(struct ata_port *ap)
1288 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1292 * sata_print_link_status - Print SATA link status
1293 * @ap: SATA port to printk link status about
1295 * This function prints link speed and status of a SATA link.
1300 static void sata_print_link_status(struct ata_port *ap)
1305 if (!ap->ops->scr_read)
1308 sstatus = scr_read(ap, SCR_STATUS);
1310 if (sata_dev_present(ap)) {
1311 tmp = (sstatus >> 4) & 0xf;
1314 else if (tmp & (1 << 1))
1317 speed = "<unknown>";
1318 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1319 ap->id, speed, sstatus);
1321 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1327 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1328 * @ap: SATA port associated with target SATA PHY.
1330 * This function issues commands to standard SATA Sxxx
1331 * PHY registers, to wake up the phy (and device), and
1332 * clear any reset condition.
1335 * PCI/etc. bus probe sem.
1338 void __sata_phy_reset(struct ata_port *ap)
1341 unsigned long timeout = jiffies + (HZ * 5);
1343 if (ap->flags & ATA_FLAG_SATA_RESET) {
1344 /* issue phy wake/reset */
1345 scr_write_flush(ap, SCR_CONTROL, 0x301);
1346 /* Couldn't find anything in SATA I/II specs, but
1347 * AHCI-1.1 10.4.2 says at least 1 ms. */
1350 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1352 /* wait for phy to become ready, if necessary */
1355 sstatus = scr_read(ap, SCR_STATUS);
1356 if ((sstatus & 0xf) != 1)
1358 } while (time_before(jiffies, timeout));
1360 /* print link status */
1361 sata_print_link_status(ap);
1363 /* TODO: phy layer with polling, timeouts, etc. */
1364 if (sata_dev_present(ap))
1367 ata_port_disable(ap);
1369 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1372 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1373 ata_port_disable(ap);
1377 ap->cbl = ATA_CBL_SATA;
1381 * sata_phy_reset - Reset SATA bus.
1382 * @ap: SATA port associated with target SATA PHY.
1384 * This function resets the SATA bus, and then probes
1385 * the bus for devices.
1388 * PCI/etc. bus probe sem.
1391 void sata_phy_reset(struct ata_port *ap)
1393 __sata_phy_reset(ap);
1394 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1400 * ata_port_disable - Disable port.
1401 * @ap: Port to be disabled.
1403 * Modify @ap data structure such that the system
1404 * thinks that the entire port is disabled, and should
1405 * never attempt to probe or communicate with devices
1408 * LOCKING: host_set lock, or some other form of
1412 void ata_port_disable(struct ata_port *ap)
1414 ap->device[0].class = ATA_DEV_NONE;
1415 ap->device[1].class = ATA_DEV_NONE;
1416 ap->flags |= ATA_FLAG_PORT_DISABLED;
1420 * This mode timing computation functionality is ported over from
1421 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1424 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1425 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1426 * for PIO 5, which is a nonstandard extension and UDMA6, which
1427 * is currently supported only by Maxtor drives.
1430 static const struct ata_timing ata_timing[] = {
1432 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1433 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1434 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1435 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1437 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1438 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1439 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1441 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1443 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1444 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1445 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1447 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1448 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1449 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1451 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1452 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1453 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1455 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1456 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1457 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1459 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1464 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1465 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1467 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1469 q->setup = EZ(t->setup * 1000, T);
1470 q->act8b = EZ(t->act8b * 1000, T);
1471 q->rec8b = EZ(t->rec8b * 1000, T);
1472 q->cyc8b = EZ(t->cyc8b * 1000, T);
1473 q->active = EZ(t->active * 1000, T);
1474 q->recover = EZ(t->recover * 1000, T);
1475 q->cycle = EZ(t->cycle * 1000, T);
1476 q->udma = EZ(t->udma * 1000, UT);
1479 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1480 struct ata_timing *m, unsigned int what)
1482 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1483 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1484 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1485 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1486 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1487 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1488 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1489 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1492 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1494 const struct ata_timing *t;
1496 for (t = ata_timing; t->mode != speed; t++)
1497 if (t->mode == 0xFF)
1502 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1503 struct ata_timing *t, int T, int UT)
1505 const struct ata_timing *s;
1506 struct ata_timing p;
1512 if (!(s = ata_timing_find_mode(speed)))
1515 memcpy(t, s, sizeof(*s));
1518 * If the drive is an EIDE drive, it can tell us it needs extended
1519 * PIO/MW_DMA cycle timing.
1522 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1523 memset(&p, 0, sizeof(p));
1524 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1525 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1526 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1527 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1528 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1530 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1534 * Convert the timing to bus clock counts.
1537 ata_timing_quantize(t, t, T, UT);
1540 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1541 * S.M.A.R.T * and some other commands. We have to ensure that the
1542 * DMA cycle timing is slower/equal than the fastest PIO timing.
1545 if (speed > XFER_PIO_4) {
1546 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1547 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1551 * Lengthen active & recovery time so that cycle time is correct.
1554 if (t->act8b + t->rec8b < t->cyc8b) {
1555 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1556 t->rec8b = t->cyc8b - t->act8b;
1559 if (t->active + t->recover < t->cycle) {
1560 t->active += (t->cycle - (t->active + t->recover)) / 2;
1561 t->recover = t->cycle - t->active;
1567 static const struct {
1570 } xfer_mode_classes[] = {
1571 { ATA_SHIFT_UDMA, XFER_UDMA_0 },
1572 { ATA_SHIFT_MWDMA, XFER_MW_DMA_0 },
1573 { ATA_SHIFT_PIO, XFER_PIO_0 },
1576 static u8 base_from_shift(unsigned int shift)
1580 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++)
1581 if (xfer_mode_classes[i].shift == shift)
1582 return xfer_mode_classes[i].base;
1587 static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1592 if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1595 if (dev->xfer_shift == ATA_SHIFT_PIO)
1596 dev->flags |= ATA_DFLAG_PIO;
1598 ata_dev_set_xfermode(ap, dev);
1600 base = base_from_shift(dev->xfer_shift);
1601 ofs = dev->xfer_mode - base;
1602 idx = ofs + dev->xfer_shift;
1603 WARN_ON(idx >= ARRAY_SIZE(xfer_mode_str));
1605 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1606 idx, dev->xfer_shift, (int)dev->xfer_mode, (int)base, ofs);
1608 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1609 ap->id, dev->devno, xfer_mode_str[idx]);
1612 static int ata_host_set_pio(struct ata_port *ap)
1618 mask = ata_get_mode_mask(ap, ATA_SHIFT_PIO);
1621 printk(KERN_WARNING "ata%u: no PIO support\n", ap->id);
1625 base = base_from_shift(ATA_SHIFT_PIO);
1626 xfer_mode = base + x;
1628 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1629 (int)base, (int)xfer_mode, mask, x);
1631 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1632 struct ata_device *dev = &ap->device[i];
1633 if (ata_dev_present(dev)) {
1634 dev->pio_mode = xfer_mode;
1635 dev->xfer_mode = xfer_mode;
1636 dev->xfer_shift = ATA_SHIFT_PIO;
1637 if (ap->ops->set_piomode)
1638 ap->ops->set_piomode(ap, dev);
1645 static void ata_host_set_dma(struct ata_port *ap, u8 xfer_mode,
1646 unsigned int xfer_shift)
1650 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1651 struct ata_device *dev = &ap->device[i];
1652 if (ata_dev_present(dev)) {
1653 dev->dma_mode = xfer_mode;
1654 dev->xfer_mode = xfer_mode;
1655 dev->xfer_shift = xfer_shift;
1656 if (ap->ops->set_dmamode)
1657 ap->ops->set_dmamode(ap, dev);
1663 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1664 * @ap: port on which timings will be programmed
1666 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1669 * PCI/etc. bus probe sem.
1671 static void ata_set_mode(struct ata_port *ap)
1673 unsigned int xfer_shift;
1677 /* step 1: always set host PIO timings */
1678 rc = ata_host_set_pio(ap);
1682 /* step 2: choose the best data xfer mode */
1683 xfer_mode = xfer_shift = 0;
1684 rc = ata_choose_xfer_mode(ap, &xfer_mode, &xfer_shift);
1688 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1689 if (xfer_shift != ATA_SHIFT_PIO)
1690 ata_host_set_dma(ap, xfer_mode, xfer_shift);
1692 /* step 4: update devices' xfer mode */
1693 ata_dev_set_mode(ap, &ap->device[0]);
1694 ata_dev_set_mode(ap, &ap->device[1]);
1696 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1699 if (ap->ops->post_set_mode)
1700 ap->ops->post_set_mode(ap);
1705 ata_port_disable(ap);
1709 * ata_tf_to_host - issue ATA taskfile to host controller
1710 * @ap: port to which command is being issued
1711 * @tf: ATA taskfile register set
1713 * Issues ATA taskfile register set to ATA host controller,
1714 * with proper synchronization with interrupt handler and
1718 * spin_lock_irqsave(host_set lock)
1721 static inline void ata_tf_to_host(struct ata_port *ap,
1722 const struct ata_taskfile *tf)
1724 ap->ops->tf_load(ap, tf);
1725 ap->ops->exec_command(ap, tf);
1729 * ata_busy_sleep - sleep until BSY clears, or timeout
1730 * @ap: port containing status register to be polled
1731 * @tmout_pat: impatience timeout
1732 * @tmout: overall timeout
1734 * Sleep until ATA Status register bit BSY clears,
1735 * or a timeout occurs.
1740 unsigned int ata_busy_sleep (struct ata_port *ap,
1741 unsigned long tmout_pat, unsigned long tmout)
1743 unsigned long timer_start, timeout;
1746 status = ata_busy_wait(ap, ATA_BUSY, 300);
1747 timer_start = jiffies;
1748 timeout = timer_start + tmout_pat;
1749 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1751 status = ata_busy_wait(ap, ATA_BUSY, 3);
1754 if (status & ATA_BUSY)
1755 printk(KERN_WARNING "ata%u is slow to respond, "
1756 "please be patient\n", ap->id);
1758 timeout = timer_start + tmout;
1759 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1761 status = ata_chk_status(ap);
1764 if (status & ATA_BUSY) {
1765 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1766 ap->id, tmout / HZ);
1773 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1775 struct ata_ioports *ioaddr = &ap->ioaddr;
1776 unsigned int dev0 = devmask & (1 << 0);
1777 unsigned int dev1 = devmask & (1 << 1);
1778 unsigned long timeout;
1780 /* if device 0 was found in ata_devchk, wait for its
1784 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1786 /* if device 1 was found in ata_devchk, wait for
1787 * register access, then wait for BSY to clear
1789 timeout = jiffies + ATA_TMOUT_BOOT;
1793 ap->ops->dev_select(ap, 1);
1794 if (ap->flags & ATA_FLAG_MMIO) {
1795 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1796 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1798 nsect = inb(ioaddr->nsect_addr);
1799 lbal = inb(ioaddr->lbal_addr);
1801 if ((nsect == 1) && (lbal == 1))
1803 if (time_after(jiffies, timeout)) {
1807 msleep(50); /* give drive a breather */
1810 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1812 /* is all this really necessary? */
1813 ap->ops->dev_select(ap, 0);
1815 ap->ops->dev_select(ap, 1);
1817 ap->ops->dev_select(ap, 0);
1821 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1822 * @ap: Port to reset and probe
1824 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1825 * probe the bus. Not often used these days.
1828 * PCI/etc. bus probe sem.
1829 * Obtains host_set lock.
1833 static unsigned int ata_bus_edd(struct ata_port *ap)
1835 struct ata_taskfile tf;
1836 unsigned long flags;
1838 /* set up execute-device-diag (bus reset) taskfile */
1839 /* also, take interrupts to a known state (disabled) */
1840 DPRINTK("execute-device-diag\n");
1841 ata_tf_init(ap, &tf, 0);
1843 tf.command = ATA_CMD_EDD;
1844 tf.protocol = ATA_PROT_NODATA;
1847 spin_lock_irqsave(&ap->host_set->lock, flags);
1848 ata_tf_to_host(ap, &tf);
1849 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1851 /* spec says at least 2ms. but who knows with those
1852 * crazy ATAPI devices...
1856 return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1859 static unsigned int ata_bus_softreset(struct ata_port *ap,
1860 unsigned int devmask)
1862 struct ata_ioports *ioaddr = &ap->ioaddr;
1864 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
1866 /* software reset. causes dev0 to be selected */
1867 if (ap->flags & ATA_FLAG_MMIO) {
1868 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1869 udelay(20); /* FIXME: flush */
1870 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
1871 udelay(20); /* FIXME: flush */
1872 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1874 outb(ap->ctl, ioaddr->ctl_addr);
1876 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
1878 outb(ap->ctl, ioaddr->ctl_addr);
1881 /* spec mandates ">= 2ms" before checking status.
1882 * We wait 150ms, because that was the magic delay used for
1883 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1884 * between when the ATA command register is written, and then
1885 * status is checked. Because waiting for "a while" before
1886 * checking status is fine, post SRST, we perform this magic
1887 * delay here as well.
1891 ata_bus_post_reset(ap, devmask);
1897 * ata_bus_reset - reset host port and associated ATA channel
1898 * @ap: port to reset
1900 * This is typically the first time we actually start issuing
1901 * commands to the ATA channel. We wait for BSY to clear, then
1902 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1903 * result. Determine what devices, if any, are on the channel
1904 * by looking at the device 0/1 error register. Look at the signature
1905 * stored in each device's taskfile registers, to determine if
1906 * the device is ATA or ATAPI.
1909 * PCI/etc. bus probe sem.
1910 * Obtains host_set lock.
1913 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1916 void ata_bus_reset(struct ata_port *ap)
1918 struct ata_ioports *ioaddr = &ap->ioaddr;
1919 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
1921 unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
1923 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
1925 /* determine if device 0/1 are present */
1926 if (ap->flags & ATA_FLAG_SATA_RESET)
1929 dev0 = ata_devchk(ap, 0);
1931 dev1 = ata_devchk(ap, 1);
1935 devmask |= (1 << 0);
1937 devmask |= (1 << 1);
1939 /* select device 0 again */
1940 ap->ops->dev_select(ap, 0);
1942 /* issue bus reset */
1943 if (ap->flags & ATA_FLAG_SRST)
1944 rc = ata_bus_softreset(ap, devmask);
1945 else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
1946 /* set up device control */
1947 if (ap->flags & ATA_FLAG_MMIO)
1948 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1950 outb(ap->ctl, ioaddr->ctl_addr);
1951 rc = ata_bus_edd(ap);
1958 * determine by signature whether we have ATA or ATAPI devices
1960 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
1961 if ((slave_possible) && (err != 0x81))
1962 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
1964 /* re-enable interrupts */
1965 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
1968 /* is double-select really necessary? */
1969 if (ap->device[1].class != ATA_DEV_NONE)
1970 ap->ops->dev_select(ap, 1);
1971 if (ap->device[0].class != ATA_DEV_NONE)
1972 ap->ops->dev_select(ap, 0);
1974 /* if no devices were detected, disable this port */
1975 if ((ap->device[0].class == ATA_DEV_NONE) &&
1976 (ap->device[1].class == ATA_DEV_NONE))
1979 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
1980 /* set up device control for ATA_FLAG_SATA_RESET */
1981 if (ap->flags & ATA_FLAG_MMIO)
1982 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1984 outb(ap->ctl, ioaddr->ctl_addr);
1991 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
1992 ap->ops->port_disable(ap);
1997 static int sata_phy_resume(struct ata_port *ap)
1999 unsigned long timeout = jiffies + (HZ * 5);
2002 scr_write_flush(ap, SCR_CONTROL, 0x300);
2004 /* Wait for phy to become ready, if necessary. */
2007 sstatus = scr_read(ap, SCR_STATUS);
2008 if ((sstatus & 0xf) != 1)
2010 } while (time_before(jiffies, timeout));
2016 * ata_std_probeinit - initialize probing
2017 * @ap: port to be probed
2019 * @ap is about to be probed. Initialize it. This function is
2020 * to be used as standard callback for ata_drive_probe_reset().
2022 * NOTE!!! Do not use this function as probeinit if a low level
2023 * driver implements only hardreset. Just pass NULL as probeinit
2024 * in that case. Using this function is probably okay but doing
2025 * so makes reset sequence different from the original
2026 * ->phy_reset implementation and Jeff nervous. :-P
2028 extern void ata_std_probeinit(struct ata_port *ap)
2030 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
2031 sata_phy_resume(ap);
2032 if (sata_dev_present(ap))
2033 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2038 * ata_std_softreset - reset host port via ATA SRST
2039 * @ap: port to reset
2040 * @verbose: fail verbosely
2041 * @classes: resulting classes of attached devices
2043 * Reset host port using ATA SRST. This function is to be used
2044 * as standard callback for ata_drive_*_reset() functions.
2047 * Kernel thread context (may sleep)
2050 * 0 on success, -errno otherwise.
2052 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2054 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2055 unsigned int devmask = 0, err_mask;
2060 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2061 classes[0] = ATA_DEV_NONE;
2065 /* determine if device 0/1 are present */
2066 if (ata_devchk(ap, 0))
2067 devmask |= (1 << 0);
2068 if (slave_possible && ata_devchk(ap, 1))
2069 devmask |= (1 << 1);
2071 /* select device 0 again */
2072 ap->ops->dev_select(ap, 0);
2074 /* issue bus reset */
2075 DPRINTK("about to softreset, devmask=%x\n", devmask);
2076 err_mask = ata_bus_softreset(ap, devmask);
2079 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2082 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2087 /* determine by signature whether we have ATA or ATAPI devices */
2088 classes[0] = ata_dev_try_classify(ap, 0, &err);
2089 if (slave_possible && err != 0x81)
2090 classes[1] = ata_dev_try_classify(ap, 1, &err);
2093 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2098 * sata_std_hardreset - reset host port via SATA phy reset
2099 * @ap: port to reset
2100 * @verbose: fail verbosely
2101 * @class: resulting class of attached device
2103 * SATA phy-reset host port using DET bits of SControl register.
2104 * This function is to be used as standard callback for
2105 * ata_drive_*_reset().
2108 * Kernel thread context (may sleep)
2111 * 0 on success, -errno otherwise.
2113 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2117 /* Issue phy wake/reset */
2118 scr_write_flush(ap, SCR_CONTROL, 0x301);
2121 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2122 * 10.4.2 says at least 1 ms.
2126 /* Bring phy back */
2127 sata_phy_resume(ap);
2129 /* TODO: phy layer with polling, timeouts, etc. */
2130 if (!sata_dev_present(ap)) {
2131 *class = ATA_DEV_NONE;
2132 DPRINTK("EXIT, link offline\n");
2136 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2138 printk(KERN_ERR "ata%u: COMRESET failed "
2139 "(device not ready)\n", ap->id);
2141 DPRINTK("EXIT, device not ready\n");
2145 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2147 *class = ata_dev_try_classify(ap, 0, NULL);
2149 DPRINTK("EXIT, class=%u\n", *class);
2154 * ata_std_postreset - standard postreset callback
2155 * @ap: the target ata_port
2156 * @classes: classes of attached devices
2158 * This function is invoked after a successful reset. Note that
2159 * the device might have been reset more than once using
2160 * different reset methods before postreset is invoked.
2162 * This function is to be used as standard callback for
2163 * ata_drive_*_reset().
2166 * Kernel thread context (may sleep)
2168 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2172 /* set cable type if it isn't already set */
2173 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2174 ap->cbl = ATA_CBL_SATA;
2176 /* print link status */
2177 if (ap->cbl == ATA_CBL_SATA)
2178 sata_print_link_status(ap);
2180 /* re-enable interrupts */
2181 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2184 /* is double-select really necessary? */
2185 if (classes[0] != ATA_DEV_NONE)
2186 ap->ops->dev_select(ap, 1);
2187 if (classes[1] != ATA_DEV_NONE)
2188 ap->ops->dev_select(ap, 0);
2190 /* bail out if no device is present */
2191 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2192 DPRINTK("EXIT, no device\n");
2196 /* set up device control */
2197 if (ap->ioaddr.ctl_addr) {
2198 if (ap->flags & ATA_FLAG_MMIO)
2199 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2201 outb(ap->ctl, ap->ioaddr.ctl_addr);
2208 * ata_std_probe_reset - standard probe reset method
2209 * @ap: prot to perform probe-reset
2210 * @classes: resulting classes of attached devices
2212 * The stock off-the-shelf ->probe_reset method.
2215 * Kernel thread context (may sleep)
2218 * 0 on success, -errno otherwise.
2220 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2222 ata_reset_fn_t hardreset;
2225 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2226 hardreset = sata_std_hardreset;
2228 return ata_drive_probe_reset(ap, ata_std_probeinit,
2229 ata_std_softreset, hardreset,
2230 ata_std_postreset, classes);
2233 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2234 ata_postreset_fn_t postreset,
2235 unsigned int *classes)
2239 for (i = 0; i < ATA_MAX_DEVICES; i++)
2240 classes[i] = ATA_DEV_UNKNOWN;
2242 rc = reset(ap, 0, classes);
2246 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2247 * is complete and convert all ATA_DEV_UNKNOWN to
2250 for (i = 0; i < ATA_MAX_DEVICES; i++)
2251 if (classes[i] != ATA_DEV_UNKNOWN)
2254 if (i < ATA_MAX_DEVICES)
2255 for (i = 0; i < ATA_MAX_DEVICES; i++)
2256 if (classes[i] == ATA_DEV_UNKNOWN)
2257 classes[i] = ATA_DEV_NONE;
2260 postreset(ap, classes);
2262 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2266 * ata_drive_probe_reset - Perform probe reset with given methods
2267 * @ap: port to reset
2268 * @probeinit: probeinit method (can be NULL)
2269 * @softreset: softreset method (can be NULL)
2270 * @hardreset: hardreset method (can be NULL)
2271 * @postreset: postreset method (can be NULL)
2272 * @classes: resulting classes of attached devices
2274 * Reset the specified port and classify attached devices using
2275 * given methods. This function prefers softreset but tries all
2276 * possible reset sequences to reset and classify devices. This
2277 * function is intended to be used for constructing ->probe_reset
2278 * callback by low level drivers.
2280 * Reset methods should follow the following rules.
2282 * - Return 0 on sucess, -errno on failure.
2283 * - If classification is supported, fill classes[] with
2284 * recognized class codes.
2285 * - If classification is not supported, leave classes[] alone.
2286 * - If verbose is non-zero, print error message on failure;
2287 * otherwise, shut up.
2290 * Kernel thread context (may sleep)
2293 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2294 * if classification fails, and any error code from reset
2297 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2298 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2299 ata_postreset_fn_t postreset, unsigned int *classes)
2307 rc = do_probe_reset(ap, softreset, postreset, classes);
2315 rc = do_probe_reset(ap, hardreset, postreset, classes);
2316 if (rc == 0 || rc != -ENODEV)
2320 rc = do_probe_reset(ap, softreset, postreset, classes);
2325 static void ata_pr_blacklisted(const struct ata_port *ap,
2326 const struct ata_device *dev)
2328 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2329 ap->id, dev->devno);
2332 static const char * const ata_dma_blacklist [] = {
2351 "Toshiba CD-ROM XM-6202B",
2352 "TOSHIBA CD-ROM XM-1702BC",
2354 "E-IDE CD-ROM CR-840",
2357 "SAMSUNG CD-ROM SC-148C",
2358 "SAMSUNG CD-ROM SC",
2360 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2364 static int ata_dma_blacklisted(const struct ata_device *dev)
2366 unsigned char model_num[41];
2369 ata_id_c_string(dev->id, model_num, ATA_ID_PROD_OFS, sizeof(model_num));
2371 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i++)
2372 if (!strcmp(ata_dma_blacklist[i], model_num))
2378 static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift)
2380 const struct ata_device *master, *slave;
2383 master = &ap->device[0];
2384 slave = &ap->device[1];
2386 WARN_ON(!ata_dev_present(master) && !ata_dev_present(slave));
2388 if (shift == ATA_SHIFT_UDMA) {
2389 mask = ap->udma_mask;
2390 if (ata_dev_present(master)) {
2391 mask &= (master->id[ATA_ID_UDMA_MODES] & 0xff);
2392 if (ata_dma_blacklisted(master)) {
2394 ata_pr_blacklisted(ap, master);
2397 if (ata_dev_present(slave)) {
2398 mask &= (slave->id[ATA_ID_UDMA_MODES] & 0xff);
2399 if (ata_dma_blacklisted(slave)) {
2401 ata_pr_blacklisted(ap, slave);
2405 else if (shift == ATA_SHIFT_MWDMA) {
2406 mask = ap->mwdma_mask;
2407 if (ata_dev_present(master)) {
2408 mask &= (master->id[ATA_ID_MWDMA_MODES] & 0x07);
2409 if (ata_dma_blacklisted(master)) {
2411 ata_pr_blacklisted(ap, master);
2414 if (ata_dev_present(slave)) {
2415 mask &= (slave->id[ATA_ID_MWDMA_MODES] & 0x07);
2416 if (ata_dma_blacklisted(slave)) {
2418 ata_pr_blacklisted(ap, slave);
2422 else if (shift == ATA_SHIFT_PIO) {
2423 mask = ap->pio_mask;
2424 if (ata_dev_present(master)) {
2425 /* spec doesn't return explicit support for
2426 * PIO0-2, so we fake it
2428 u16 tmp_mode = master->id[ATA_ID_PIO_MODES] & 0x03;
2433 if (ata_dev_present(slave)) {
2434 /* spec doesn't return explicit support for
2435 * PIO0-2, so we fake it
2437 u16 tmp_mode = slave->id[ATA_ID_PIO_MODES] & 0x03;
2444 mask = 0xffffffff; /* shut up compiler warning */
2451 /* find greatest bit */
2452 static int fgb(u32 bitmap)
2457 for (i = 0; i < 32; i++)
2458 if (bitmap & (1 << i))
2465 * ata_choose_xfer_mode - attempt to find best transfer mode
2466 * @ap: Port for which an xfer mode will be selected
2467 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2468 * @xfer_shift_out: (output) bit shift that selects this mode
2470 * Based on host and device capabilities, determine the
2471 * maximum transfer mode that is amenable to all.
2474 * PCI/etc. bus probe sem.
2477 * Zero on success, negative on error.
2480 static int ata_choose_xfer_mode(const struct ata_port *ap,
2482 unsigned int *xfer_shift_out)
2484 unsigned int mask, shift;
2487 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++) {
2488 shift = xfer_mode_classes[i].shift;
2489 mask = ata_get_mode_mask(ap, shift);
2493 *xfer_mode_out = xfer_mode_classes[i].base + x;
2494 *xfer_shift_out = shift;
2503 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2504 * @ap: Port associated with device @dev
2505 * @dev: Device to which command will be sent
2507 * Issue SET FEATURES - XFER MODE command to device @dev
2511 * PCI/etc. bus probe sem.
2514 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
2516 struct ata_taskfile tf;
2518 /* set up set-features taskfile */
2519 DPRINTK("set features - xfer mode\n");
2521 ata_tf_init(ap, &tf, dev->devno);
2522 tf.command = ATA_CMD_SET_FEATURES;
2523 tf.feature = SETFEATURES_XFER;
2524 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2525 tf.protocol = ATA_PROT_NODATA;
2526 tf.nsect = dev->xfer_mode;
2528 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2529 printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
2531 ata_port_disable(ap);
2538 * ata_dev_init_params - Issue INIT DEV PARAMS command
2539 * @ap: Port associated with device @dev
2540 * @dev: Device to which command will be sent
2543 * Kernel thread context (may sleep)
2546 * 0 on success, AC_ERR_* mask otherwise.
2549 static unsigned int ata_dev_init_params(struct ata_port *ap,
2550 struct ata_device *dev)
2552 struct ata_taskfile tf;
2553 unsigned int err_mask;
2554 u16 sectors = dev->id[6];
2555 u16 heads = dev->id[3];
2557 /* Number of sectors per track 1-255. Number of heads 1-16 */
2558 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2561 /* set up init dev params taskfile */
2562 DPRINTK("init dev params \n");
2564 ata_tf_init(ap, &tf, dev->devno);
2565 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2566 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2567 tf.protocol = ATA_PROT_NODATA;
2569 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2571 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2573 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2578 * ata_sg_clean - Unmap DMA memory associated with command
2579 * @qc: Command containing DMA memory to be released
2581 * Unmap all mapped DMA memory associated with this command.
2584 * spin_lock_irqsave(host_set lock)
2587 static void ata_sg_clean(struct ata_queued_cmd *qc)
2589 struct ata_port *ap = qc->ap;
2590 struct scatterlist *sg = qc->__sg;
2591 int dir = qc->dma_dir;
2592 void *pad_buf = NULL;
2594 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2595 WARN_ON(sg == NULL);
2597 if (qc->flags & ATA_QCFLAG_SINGLE)
2598 WARN_ON(qc->n_elem > 1);
2600 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2602 /* if we padded the buffer out to 32-bit bound, and data
2603 * xfer direction is from-device, we must copy from the
2604 * pad buffer back into the supplied buffer
2606 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2607 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2609 if (qc->flags & ATA_QCFLAG_SG) {
2611 dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
2612 /* restore last sg */
2613 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2615 struct scatterlist *psg = &qc->pad_sgent;
2616 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2617 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2618 kunmap_atomic(addr, KM_IRQ0);
2622 dma_unmap_single(ap->host_set->dev,
2623 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2626 sg->length += qc->pad_len;
2628 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2629 pad_buf, qc->pad_len);
2632 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2637 * ata_fill_sg - Fill PCI IDE PRD table
2638 * @qc: Metadata associated with taskfile to be transferred
2640 * Fill PCI IDE PRD (scatter-gather) table with segments
2641 * associated with the current disk command.
2644 * spin_lock_irqsave(host_set lock)
2647 static void ata_fill_sg(struct ata_queued_cmd *qc)
2649 struct ata_port *ap = qc->ap;
2650 struct scatterlist *sg;
2653 WARN_ON(qc->__sg == NULL);
2654 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2657 ata_for_each_sg(sg, qc) {
2661 /* determine if physical DMA addr spans 64K boundary.
2662 * Note h/w doesn't support 64-bit, so we unconditionally
2663 * truncate dma_addr_t to u32.
2665 addr = (u32) sg_dma_address(sg);
2666 sg_len = sg_dma_len(sg);
2669 offset = addr & 0xffff;
2671 if ((offset + sg_len) > 0x10000)
2672 len = 0x10000 - offset;
2674 ap->prd[idx].addr = cpu_to_le32(addr);
2675 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2676 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2685 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2688 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2689 * @qc: Metadata associated with taskfile to check
2691 * Allow low-level driver to filter ATA PACKET commands, returning
2692 * a status indicating whether or not it is OK to use DMA for the
2693 * supplied PACKET command.
2696 * spin_lock_irqsave(host_set lock)
2698 * RETURNS: 0 when ATAPI DMA can be used
2701 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2703 struct ata_port *ap = qc->ap;
2704 int rc = 0; /* Assume ATAPI DMA is OK by default */
2706 if (ap->ops->check_atapi_dma)
2707 rc = ap->ops->check_atapi_dma(qc);
2712 * ata_qc_prep - Prepare taskfile for submission
2713 * @qc: Metadata associated with taskfile to be prepared
2715 * Prepare ATA taskfile for submission.
2718 * spin_lock_irqsave(host_set lock)
2720 void ata_qc_prep(struct ata_queued_cmd *qc)
2722 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2729 * ata_sg_init_one - Associate command with memory buffer
2730 * @qc: Command to be associated
2731 * @buf: Memory buffer
2732 * @buflen: Length of memory buffer, in bytes.
2734 * Initialize the data-related elements of queued_cmd @qc
2735 * to point to a single memory buffer, @buf of byte length @buflen.
2738 * spin_lock_irqsave(host_set lock)
2741 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2743 struct scatterlist *sg;
2745 qc->flags |= ATA_QCFLAG_SINGLE;
2747 memset(&qc->sgent, 0, sizeof(qc->sgent));
2748 qc->__sg = &qc->sgent;
2750 qc->orig_n_elem = 1;
2754 sg_init_one(sg, buf, buflen);
2758 * ata_sg_init - Associate command with scatter-gather table.
2759 * @qc: Command to be associated
2760 * @sg: Scatter-gather table.
2761 * @n_elem: Number of elements in s/g table.
2763 * Initialize the data-related elements of queued_cmd @qc
2764 * to point to a scatter-gather table @sg, containing @n_elem
2768 * spin_lock_irqsave(host_set lock)
2771 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2772 unsigned int n_elem)
2774 qc->flags |= ATA_QCFLAG_SG;
2776 qc->n_elem = n_elem;
2777 qc->orig_n_elem = n_elem;
2781 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2782 * @qc: Command with memory buffer to be mapped.
2784 * DMA-map the memory buffer associated with queued_cmd @qc.
2787 * spin_lock_irqsave(host_set lock)
2790 * Zero on success, negative on error.
2793 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
2795 struct ata_port *ap = qc->ap;
2796 int dir = qc->dma_dir;
2797 struct scatterlist *sg = qc->__sg;
2798 dma_addr_t dma_address;
2801 /* we must lengthen transfers to end on a 32-bit boundary */
2802 qc->pad_len = sg->length & 3;
2804 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2805 struct scatterlist *psg = &qc->pad_sgent;
2807 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2809 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2811 if (qc->tf.flags & ATA_TFLAG_WRITE)
2812 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
2815 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2816 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2818 sg->length -= qc->pad_len;
2819 if (sg->length == 0)
2822 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2823 sg->length, qc->pad_len);
2831 dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
2833 if (dma_mapping_error(dma_address)) {
2835 sg->length += qc->pad_len;
2839 sg_dma_address(sg) = dma_address;
2840 sg_dma_len(sg) = sg->length;
2843 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
2844 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
2850 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2851 * @qc: Command with scatter-gather table to be mapped.
2853 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2856 * spin_lock_irqsave(host_set lock)
2859 * Zero on success, negative on error.
2863 static int ata_sg_setup(struct ata_queued_cmd *qc)
2865 struct ata_port *ap = qc->ap;
2866 struct scatterlist *sg = qc->__sg;
2867 struct scatterlist *lsg = &sg[qc->n_elem - 1];
2868 int n_elem, pre_n_elem, dir, trim_sg = 0;
2870 VPRINTK("ENTER, ata%u\n", ap->id);
2871 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
2873 /* we must lengthen transfers to end on a 32-bit boundary */
2874 qc->pad_len = lsg->length & 3;
2876 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2877 struct scatterlist *psg = &qc->pad_sgent;
2878 unsigned int offset;
2880 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2882 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2885 * psg->page/offset are used to copy to-be-written
2886 * data in this function or read data in ata_sg_clean.
2888 offset = lsg->offset + lsg->length - qc->pad_len;
2889 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
2890 psg->offset = offset_in_page(offset);
2892 if (qc->tf.flags & ATA_TFLAG_WRITE) {
2893 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2894 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
2895 kunmap_atomic(addr, KM_IRQ0);
2898 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2899 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2901 lsg->length -= qc->pad_len;
2902 if (lsg->length == 0)
2905 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2906 qc->n_elem - 1, lsg->length, qc->pad_len);
2909 pre_n_elem = qc->n_elem;
2910 if (trim_sg && pre_n_elem)
2919 n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
2921 /* restore last sg */
2922 lsg->length += qc->pad_len;
2926 DPRINTK("%d sg elements mapped\n", n_elem);
2929 qc->n_elem = n_elem;
2935 * ata_poll_qc_complete - turn irq back on and finish qc
2936 * @qc: Command to complete
2937 * @err_mask: ATA status register content
2940 * None. (grabs host lock)
2943 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
2945 struct ata_port *ap = qc->ap;
2946 unsigned long flags;
2948 spin_lock_irqsave(&ap->host_set->lock, flags);
2950 ata_qc_complete(qc);
2951 spin_unlock_irqrestore(&ap->host_set->lock, flags);
2955 * ata_pio_poll - poll using PIO, depending on current state
2956 * @ap: the target ata_port
2959 * None. (executing in kernel thread context)
2962 * timeout value to use
2965 static unsigned long ata_pio_poll(struct ata_port *ap)
2967 struct ata_queued_cmd *qc;
2969 unsigned int poll_state = HSM_ST_UNKNOWN;
2970 unsigned int reg_state = HSM_ST_UNKNOWN;
2972 qc = ata_qc_from_tag(ap, ap->active_tag);
2973 WARN_ON(qc == NULL);
2975 switch (ap->hsm_task_state) {
2978 poll_state = HSM_ST_POLL;
2982 case HSM_ST_LAST_POLL:
2983 poll_state = HSM_ST_LAST_POLL;
2984 reg_state = HSM_ST_LAST;
2991 status = ata_chk_status(ap);
2992 if (status & ATA_BUSY) {
2993 if (time_after(jiffies, ap->pio_task_timeout)) {
2994 qc->err_mask |= AC_ERR_TIMEOUT;
2995 ap->hsm_task_state = HSM_ST_TMOUT;
2998 ap->hsm_task_state = poll_state;
2999 return ATA_SHORT_PAUSE;
3002 ap->hsm_task_state = reg_state;
3007 * ata_pio_complete - check if drive is busy or idle
3008 * @ap: the target ata_port
3011 * None. (executing in kernel thread context)
3014 * Zero if qc completed.
3015 * Non-zero if has next.
3018 static int ata_pio_complete (struct ata_port *ap)
3020 struct ata_queued_cmd *qc;
3024 * This is purely heuristic. This is a fast path. Sometimes when
3025 * we enter, BSY will be cleared in a chk-status or two. If not,
3026 * the drive is probably seeking or something. Snooze for a couple
3027 * msecs, then chk-status again. If still busy, fall back to
3028 * HSM_ST_LAST_POLL state.
3030 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3031 if (drv_stat & ATA_BUSY) {
3033 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3034 if (drv_stat & ATA_BUSY) {
3035 ap->hsm_task_state = HSM_ST_LAST_POLL;
3036 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3041 qc = ata_qc_from_tag(ap, ap->active_tag);
3042 WARN_ON(qc == NULL);
3044 drv_stat = ata_wait_idle(ap);
3045 if (!ata_ok(drv_stat)) {
3046 qc->err_mask |= __ac_err_mask(drv_stat);
3047 ap->hsm_task_state = HSM_ST_ERR;
3051 ap->hsm_task_state = HSM_ST_IDLE;
3053 WARN_ON(qc->err_mask);
3054 ata_poll_qc_complete(qc);
3056 /* another command may start at this point */
3063 * swap_buf_le16 - swap halves of 16-bit words in place
3064 * @buf: Buffer to swap
3065 * @buf_words: Number of 16-bit words in buffer.
3067 * Swap halves of 16-bit words if needed to convert from
3068 * little-endian byte order to native cpu byte order, or
3072 * Inherited from caller.
3074 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3079 for (i = 0; i < buf_words; i++)
3080 buf[i] = le16_to_cpu(buf[i]);
3081 #endif /* __BIG_ENDIAN */
3085 * ata_mmio_data_xfer - Transfer data by MMIO
3086 * @ap: port to read/write
3088 * @buflen: buffer length
3089 * @write_data: read/write
3091 * Transfer data from/to the device data register by MMIO.
3094 * Inherited from caller.
3097 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3098 unsigned int buflen, int write_data)
3101 unsigned int words = buflen >> 1;
3102 u16 *buf16 = (u16 *) buf;
3103 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3105 /* Transfer multiple of 2 bytes */
3107 for (i = 0; i < words; i++)
3108 writew(le16_to_cpu(buf16[i]), mmio);
3110 for (i = 0; i < words; i++)
3111 buf16[i] = cpu_to_le16(readw(mmio));
3114 /* Transfer trailing 1 byte, if any. */
3115 if (unlikely(buflen & 0x01)) {
3116 u16 align_buf[1] = { 0 };
3117 unsigned char *trailing_buf = buf + buflen - 1;
3120 memcpy(align_buf, trailing_buf, 1);
3121 writew(le16_to_cpu(align_buf[0]), mmio);
3123 align_buf[0] = cpu_to_le16(readw(mmio));
3124 memcpy(trailing_buf, align_buf, 1);
3130 * ata_pio_data_xfer - Transfer data by PIO
3131 * @ap: port to read/write
3133 * @buflen: buffer length
3134 * @write_data: read/write
3136 * Transfer data from/to the device data register by PIO.
3139 * Inherited from caller.
3142 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3143 unsigned int buflen, int write_data)
3145 unsigned int words = buflen >> 1;
3147 /* Transfer multiple of 2 bytes */
3149 outsw(ap->ioaddr.data_addr, buf, words);
3151 insw(ap->ioaddr.data_addr, buf, words);
3153 /* Transfer trailing 1 byte, if any. */
3154 if (unlikely(buflen & 0x01)) {
3155 u16 align_buf[1] = { 0 };
3156 unsigned char *trailing_buf = buf + buflen - 1;
3159 memcpy(align_buf, trailing_buf, 1);
3160 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3162 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3163 memcpy(trailing_buf, align_buf, 1);
3169 * ata_data_xfer - Transfer data from/to the data register.
3170 * @ap: port to read/write
3172 * @buflen: buffer length
3173 * @do_write: read/write
3175 * Transfer data from/to the device data register.
3178 * Inherited from caller.
3181 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3182 unsigned int buflen, int do_write)
3184 /* Make the crap hardware pay the costs not the good stuff */
3185 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3186 unsigned long flags;
3187 local_irq_save(flags);
3188 if (ap->flags & ATA_FLAG_MMIO)
3189 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3191 ata_pio_data_xfer(ap, buf, buflen, do_write);
3192 local_irq_restore(flags);
3194 if (ap->flags & ATA_FLAG_MMIO)
3195 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3197 ata_pio_data_xfer(ap, buf, buflen, do_write);
3202 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3203 * @qc: Command on going
3205 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3208 * Inherited from caller.
3211 static void ata_pio_sector(struct ata_queued_cmd *qc)
3213 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3214 struct scatterlist *sg = qc->__sg;
3215 struct ata_port *ap = qc->ap;
3217 unsigned int offset;
3220 if (qc->cursect == (qc->nsect - 1))
3221 ap->hsm_task_state = HSM_ST_LAST;
3223 page = sg[qc->cursg].page;
3224 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3226 /* get the current page and offset */
3227 page = nth_page(page, (offset >> PAGE_SHIFT));
3228 offset %= PAGE_SIZE;
3230 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3232 if (PageHighMem(page)) {
3233 unsigned long flags;
3235 local_irq_save(flags);
3236 buf = kmap_atomic(page, KM_IRQ0);
3238 /* do the actual data transfer */
3239 ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
3241 kunmap_atomic(buf, KM_IRQ0);
3242 local_irq_restore(flags);
3244 buf = page_address(page);
3245 ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
3251 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3258 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3259 * @qc: Command on going
3261 * Transfer one or many ATA_SECT_SIZE of data from/to the
3262 * ATA device for the DRQ request.
3265 * Inherited from caller.
3268 static void ata_pio_sectors(struct ata_queued_cmd *qc)
3270 if (is_multi_taskfile(&qc->tf)) {
3271 /* READ/WRITE MULTIPLE */
3274 WARN_ON(qc->dev->multi_count == 0);
3276 nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
3284 * atapi_send_cdb - Write CDB bytes to hardware
3285 * @ap: Port to which ATAPI device is attached.
3286 * @qc: Taskfile currently active
3288 * When device has indicated its readiness to accept
3289 * a CDB, this function is called. Send the CDB.
3295 static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
3298 DPRINTK("send cdb\n");
3299 WARN_ON(qc->dev->cdb_len < 12);
3301 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3302 ata_altstatus(ap); /* flush */
3304 switch (qc->tf.protocol) {
3305 case ATA_PROT_ATAPI:
3306 ap->hsm_task_state = HSM_ST;
3308 case ATA_PROT_ATAPI_NODATA:
3309 ap->hsm_task_state = HSM_ST_LAST;
3311 case ATA_PROT_ATAPI_DMA:
3312 ap->hsm_task_state = HSM_ST_LAST;
3313 /* initiate bmdma */
3314 ap->ops->bmdma_start(qc);
3320 * ata_pio_first_block - Write first data block to hardware
3321 * @ap: Port to which ATA/ATAPI device is attached.
3323 * When device has indicated its readiness to accept
3324 * the data, this function sends out the CDB or
3325 * the first data block by PIO.
3327 * - If polling, ata_pio_task() handles the rest.
3328 * - Otherwise, interrupt handler takes over.
3331 * Kernel thread context (may sleep)
3334 * Zero if irq handler takes over
3335 * Non-zero if has next (polling).
3338 static int ata_pio_first_block(struct ata_port *ap)
3340 struct ata_queued_cmd *qc;
3342 unsigned long flags;
3345 qc = ata_qc_from_tag(ap, ap->active_tag);
3346 WARN_ON(qc == NULL);
3347 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
3349 /* if polling, we will stay in the work queue after sending the data.
3350 * otherwise, interrupt handler takes over after sending the data.
3352 has_next = (qc->tf.flags & ATA_TFLAG_POLLING);
3354 /* sleep-wait for BSY to clear */
3355 DPRINTK("busy wait\n");
3356 if (ata_busy_sleep(ap, ATA_TMOUT_DATAOUT_QUICK, ATA_TMOUT_DATAOUT)) {
3357 qc->err_mask |= AC_ERR_TIMEOUT;
3358 ap->hsm_task_state = HSM_ST_TMOUT;
3362 /* make sure DRQ is set */
3363 status = ata_chk_status(ap);
3364 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3365 /* device status error */
3366 qc->err_mask |= AC_ERR_HSM;
3367 ap->hsm_task_state = HSM_ST_ERR;
3371 /* Send the CDB (atapi) or the first data block (ata pio out).
3372 * During the state transition, interrupt handler shouldn't
3373 * be invoked before the data transfer is complete and
3374 * hsm_task_state is changed. Hence, the following locking.
3376 spin_lock_irqsave(&ap->host_set->lock, flags);
3378 if (qc->tf.protocol == ATA_PROT_PIO) {
3379 /* PIO data out protocol.
3380 * send first data block.
3383 /* ata_pio_sectors() might change the state to HSM_ST_LAST.
3384 * so, the state is changed here before ata_pio_sectors().
3386 ap->hsm_task_state = HSM_ST;
3387 ata_pio_sectors(qc);
3388 ata_altstatus(ap); /* flush */
3391 atapi_send_cdb(ap, qc);
3393 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3395 /* if polling, ata_pio_task() handles the rest.
3396 * otherwise, interrupt handler takes over from here.
3401 return 1; /* has next */
3405 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3406 * @qc: Command on going
3407 * @bytes: number of bytes
3409 * Transfer Transfer data from/to the ATAPI device.
3412 * Inherited from caller.
3416 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3418 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3419 struct scatterlist *sg = qc->__sg;
3420 struct ata_port *ap = qc->ap;
3423 unsigned int offset, count;
3425 if (qc->curbytes + bytes >= qc->nbytes)
3426 ap->hsm_task_state = HSM_ST_LAST;
3429 if (unlikely(qc->cursg >= qc->n_elem)) {
3431 * The end of qc->sg is reached and the device expects
3432 * more data to transfer. In order not to overrun qc->sg
3433 * and fulfill length specified in the byte count register,
3434 * - for read case, discard trailing data from the device
3435 * - for write case, padding zero data to the device
3437 u16 pad_buf[1] = { 0 };
3438 unsigned int words = bytes >> 1;
3441 if (words) /* warning if bytes > 1 */
3442 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3445 for (i = 0; i < words; i++)
3446 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3448 ap->hsm_task_state = HSM_ST_LAST;
3452 sg = &qc->__sg[qc->cursg];
3455 offset = sg->offset + qc->cursg_ofs;
3457 /* get the current page and offset */
3458 page = nth_page(page, (offset >> PAGE_SHIFT));
3459 offset %= PAGE_SIZE;
3461 /* don't overrun current sg */
3462 count = min(sg->length - qc->cursg_ofs, bytes);
3464 /* don't cross page boundaries */
3465 count = min(count, (unsigned int)PAGE_SIZE - offset);
3467 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3469 if (PageHighMem(page)) {
3470 unsigned long flags;
3472 local_irq_save(flags);
3473 buf = kmap_atomic(page, KM_IRQ0);
3475 /* do the actual data transfer */
3476 ata_data_xfer(ap, buf + offset, count, do_write);
3478 kunmap_atomic(buf, KM_IRQ0);
3479 local_irq_restore(flags);
3481 buf = page_address(page);
3482 ata_data_xfer(ap, buf + offset, count, do_write);
3486 qc->curbytes += count;
3487 qc->cursg_ofs += count;
3489 if (qc->cursg_ofs == sg->length) {
3499 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3500 * @qc: Command on going
3502 * Transfer Transfer data from/to the ATAPI device.
3505 * Inherited from caller.
3508 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3510 struct ata_port *ap = qc->ap;
3511 struct ata_device *dev = qc->dev;
3512 unsigned int ireason, bc_lo, bc_hi, bytes;
3513 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3515 ap->ops->tf_read(ap, &qc->tf);
3516 ireason = qc->tf.nsect;
3517 bc_lo = qc->tf.lbam;
3518 bc_hi = qc->tf.lbah;
3519 bytes = (bc_hi << 8) | bc_lo;
3521 /* shall be cleared to zero, indicating xfer of data */
3522 if (ireason & (1 << 0))
3525 /* make sure transfer direction matches expected */
3526 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3527 if (do_write != i_write)
3530 VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);
3532 __atapi_pio_bytes(qc, bytes);
3537 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3538 ap->id, dev->devno);
3539 qc->err_mask |= AC_ERR_HSM;
3540 ap->hsm_task_state = HSM_ST_ERR;
3544 * ata_pio_block - start PIO on a block
3545 * @ap: the target ata_port
3548 * None. (executing in kernel thread context)
3551 static void ata_pio_block(struct ata_port *ap)
3553 struct ata_queued_cmd *qc;
3557 * This is purely heuristic. This is a fast path.
3558 * Sometimes when we enter, BSY will be cleared in
3559 * a chk-status or two. If not, the drive is probably seeking
3560 * or something. Snooze for a couple msecs, then
3561 * chk-status again. If still busy, fall back to
3562 * HSM_ST_POLL state.
3564 status = ata_busy_wait(ap, ATA_BUSY, 5);
3565 if (status & ATA_BUSY) {
3567 status = ata_busy_wait(ap, ATA_BUSY, 10);
3568 if (status & ATA_BUSY) {
3569 ap->hsm_task_state = HSM_ST_POLL;
3570 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3575 qc = ata_qc_from_tag(ap, ap->active_tag);
3576 WARN_ON(qc == NULL);
3579 if (status & (ATA_ERR | ATA_DF)) {
3580 qc->err_mask |= AC_ERR_DEV;
3581 ap->hsm_task_state = HSM_ST_ERR;
3585 /* transfer data if any */
3586 if (is_atapi_taskfile(&qc->tf)) {
3587 /* DRQ=0 means no more data to transfer */
3588 if ((status & ATA_DRQ) == 0) {
3589 ap->hsm_task_state = HSM_ST_LAST;
3593 atapi_pio_bytes(qc);
3595 /* handle BSY=0, DRQ=0 as error */
3596 if ((status & ATA_DRQ) == 0) {
3597 qc->err_mask |= AC_ERR_HSM;
3598 ap->hsm_task_state = HSM_ST_ERR;
3602 ata_pio_sectors(qc);
3605 ata_altstatus(ap); /* flush */
3608 static void ata_pio_error(struct ata_port *ap)
3610 struct ata_queued_cmd *qc;
3612 qc = ata_qc_from_tag(ap, ap->active_tag);
3613 WARN_ON(qc == NULL);
3615 if (qc->tf.command != ATA_CMD_PACKET)
3616 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3618 /* make sure qc->err_mask is available to
3619 * know what's wrong and recover
3621 WARN_ON(qc->err_mask == 0);
3623 ap->hsm_task_state = HSM_ST_IDLE;
3625 ata_poll_qc_complete(qc);
3628 static void ata_pio_task(void *_data)
3630 struct ata_port *ap = _data;
3631 unsigned long timeout;
3638 switch (ap->hsm_task_state) {
3640 has_next = ata_pio_first_block(ap);
3648 has_next = ata_pio_complete(ap);
3652 case HSM_ST_LAST_POLL:
3653 timeout = ata_pio_poll(ap);
3667 ata_queue_delayed_pio_task(ap, timeout);
3673 * ata_qc_timeout - Handle timeout of queued command
3674 * @qc: Command that timed out
3676 * Some part of the kernel (currently, only the SCSI layer)
3677 * has noticed that the active command on port @ap has not
3678 * completed after a specified length of time. Handle this
3679 * condition by disabling DMA (if necessary) and completing
3680 * transactions, with error if necessary.
3682 * This also handles the case of the "lost interrupt", where
3683 * for some reason (possibly hardware bug, possibly driver bug)
3684 * an interrupt was not delivered to the driver, even though the
3685 * transaction completed successfully.
3688 * Inherited from SCSI layer (none, can sleep)
3691 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3693 struct ata_port *ap = qc->ap;
3694 struct ata_host_set *host_set = ap->host_set;
3695 u8 host_stat = 0, drv_stat;
3696 unsigned long flags;
3700 ata_flush_pio_tasks(ap);
3701 ap->hsm_task_state = HSM_ST_IDLE;
3703 spin_lock_irqsave(&host_set->lock, flags);
3705 switch (qc->tf.protocol) {
3708 case ATA_PROT_ATAPI_DMA:
3709 host_stat = ap->ops->bmdma_status(ap);
3711 /* before we do anything else, clear DMA-Start bit */
3712 ap->ops->bmdma_stop(qc);
3718 drv_stat = ata_chk_status(ap);
3720 /* ack bmdma irq events */
3721 ap->ops->irq_clear(ap);
3723 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3724 ap->id, qc->tf.command, drv_stat, host_stat);
3726 ap->hsm_task_state = HSM_ST_IDLE;
3728 /* complete taskfile transaction */
3729 qc->err_mask |= AC_ERR_TIMEOUT;
3733 spin_unlock_irqrestore(&host_set->lock, flags);
3735 ata_eh_qc_complete(qc);
3741 * ata_eng_timeout - Handle timeout of queued command
3742 * @ap: Port on which timed-out command is active
3744 * Some part of the kernel (currently, only the SCSI layer)
3745 * has noticed that the active command on port @ap has not
3746 * completed after a specified length of time. Handle this
3747 * condition by disabling DMA (if necessary) and completing
3748 * transactions, with error if necessary.
3750 * This also handles the case of the "lost interrupt", where
3751 * for some reason (possibly hardware bug, possibly driver bug)
3752 * an interrupt was not delivered to the driver, even though the
3753 * transaction completed successfully.
3756 * Inherited from SCSI layer (none, can sleep)
3759 void ata_eng_timeout(struct ata_port *ap)
3763 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3769 * ata_qc_new - Request an available ATA command, for queueing
3770 * @ap: Port associated with device @dev
3771 * @dev: Device from whom we request an available command structure
3777 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3779 struct ata_queued_cmd *qc = NULL;
3782 for (i = 0; i < ATA_MAX_QUEUE; i++)
3783 if (!test_and_set_bit(i, &ap->qactive)) {
3784 qc = ata_qc_from_tag(ap, i);
3795 * ata_qc_new_init - Request an available ATA command, and initialize it
3796 * @ap: Port associated with device @dev
3797 * @dev: Device from whom we request an available command structure
3803 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3804 struct ata_device *dev)
3806 struct ata_queued_cmd *qc;
3808 qc = ata_qc_new(ap);
3821 * ata_qc_free - free unused ata_queued_cmd
3822 * @qc: Command to complete
3824 * Designed to free unused ata_queued_cmd object
3825 * in case something prevents using it.
3828 * spin_lock_irqsave(host_set lock)
3830 void ata_qc_free(struct ata_queued_cmd *qc)
3832 struct ata_port *ap = qc->ap;
3835 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3839 if (likely(ata_tag_valid(tag))) {
3840 if (tag == ap->active_tag)
3841 ap->active_tag = ATA_TAG_POISON;
3842 qc->tag = ATA_TAG_POISON;
3843 clear_bit(tag, &ap->qactive);
3847 void __ata_qc_complete(struct ata_queued_cmd *qc)
3849 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3850 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3852 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3855 /* atapi: mark qc as inactive to prevent the interrupt handler
3856 * from completing the command twice later, before the error handler
3857 * is called. (when rc != 0 and atapi request sense is needed)
3859 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3861 /* call completion callback */
3862 qc->complete_fn(qc);
3865 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3867 struct ata_port *ap = qc->ap;
3869 switch (qc->tf.protocol) {
3871 case ATA_PROT_ATAPI_DMA:
3874 case ATA_PROT_ATAPI:
3876 case ATA_PROT_PIO_MULT:
3877 if (ap->flags & ATA_FLAG_PIO_DMA)
3890 * ata_qc_issue - issue taskfile to device
3891 * @qc: command to issue to device
3893 * Prepare an ATA command to submission to device.
3894 * This includes mapping the data into a DMA-able
3895 * area, filling in the S/G table, and finally
3896 * writing the taskfile to hardware, starting the command.
3899 * spin_lock_irqsave(host_set lock)
3902 * Zero on success, AC_ERR_* mask on failure
3905 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
3907 struct ata_port *ap = qc->ap;
3909 if (ata_should_dma_map(qc)) {
3910 if (qc->flags & ATA_QCFLAG_SG) {
3911 if (ata_sg_setup(qc))
3913 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
3914 if (ata_sg_setup_one(qc))
3918 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3921 ap->ops->qc_prep(qc);
3923 qc->ap->active_tag = qc->tag;
3924 qc->flags |= ATA_QCFLAG_ACTIVE;
3926 return ap->ops->qc_issue(qc);
3929 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3930 return AC_ERR_SYSTEM;
3935 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3936 * @qc: command to issue to device
3938 * Using various libata functions and hooks, this function
3939 * starts an ATA command. ATA commands are grouped into
3940 * classes called "protocols", and issuing each type of protocol
3941 * is slightly different.
3943 * May be used as the qc_issue() entry in ata_port_operations.
3946 * spin_lock_irqsave(host_set lock)
3949 * Zero on success, AC_ERR_* mask on failure
3952 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
3954 struct ata_port *ap = qc->ap;
3956 /* Use polling pio if the LLD doesn't handle
3957 * interrupt driven pio and atapi CDB interrupt.
3959 if (ap->flags & ATA_FLAG_PIO_POLLING) {
3960 switch (qc->tf.protocol) {
3962 case ATA_PROT_ATAPI:
3963 case ATA_PROT_ATAPI_NODATA:
3964 qc->tf.flags |= ATA_TFLAG_POLLING;
3966 case ATA_PROT_ATAPI_DMA:
3967 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
3975 /* select the device */
3976 ata_dev_select(ap, qc->dev->devno, 1, 0);
3978 /* start the command */
3979 switch (qc->tf.protocol) {
3980 case ATA_PROT_NODATA:
3981 if (qc->tf.flags & ATA_TFLAG_POLLING)
3982 ata_qc_set_polling(qc);
3984 ata_tf_to_host(ap, &qc->tf);
3985 ap->hsm_task_state = HSM_ST_LAST;
3987 if (qc->tf.flags & ATA_TFLAG_POLLING)
3988 ata_queue_pio_task(ap);
3993 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
3995 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
3996 ap->ops->bmdma_setup(qc); /* set up bmdma */
3997 ap->ops->bmdma_start(qc); /* initiate bmdma */
3998 ap->hsm_task_state = HSM_ST_LAST;
4002 if (qc->tf.flags & ATA_TFLAG_POLLING)
4003 ata_qc_set_polling(qc);
4005 ata_tf_to_host(ap, &qc->tf);
4007 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4008 /* PIO data out protocol */
4009 ap->hsm_task_state = HSM_ST_FIRST;
4010 ata_queue_pio_task(ap);
4012 /* always send first data block using
4013 * the ata_pio_task() codepath.
4016 /* PIO data in protocol */
4017 ap->hsm_task_state = HSM_ST;
4019 if (qc->tf.flags & ATA_TFLAG_POLLING)
4020 ata_queue_pio_task(ap);
4022 /* if polling, ata_pio_task() handles the rest.
4023 * otherwise, interrupt handler takes over from here.
4029 case ATA_PROT_ATAPI:
4030 case ATA_PROT_ATAPI_NODATA:
4031 if (qc->tf.flags & ATA_TFLAG_POLLING)
4032 ata_qc_set_polling(qc);
4034 ata_tf_to_host(ap, &qc->tf);
4036 ap->hsm_task_state = HSM_ST_FIRST;
4038 /* send cdb by polling if no cdb interrupt */
4039 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
4040 (qc->tf.flags & ATA_TFLAG_POLLING))
4041 ata_queue_pio_task(ap);
4044 case ATA_PROT_ATAPI_DMA:
4045 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4047 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4048 ap->ops->bmdma_setup(qc); /* set up bmdma */
4049 ap->hsm_task_state = HSM_ST_FIRST;
4051 /* send cdb by polling if no cdb interrupt */
4052 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4053 ata_queue_pio_task(ap);
4058 return AC_ERR_SYSTEM;
4065 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
4066 * @qc: Info associated with this ATA transaction.
4069 * spin_lock_irqsave(host_set lock)
4072 static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
4074 struct ata_port *ap = qc->ap;
4075 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
4077 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4079 /* load PRD table addr. */
4080 mb(); /* make sure PRD table writes are visible to controller */
4081 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
4083 /* specify data direction, triple-check start bit is clear */
4084 dmactl = readb(mmio + ATA_DMA_CMD);
4085 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
4087 dmactl |= ATA_DMA_WR;
4088 writeb(dmactl, mmio + ATA_DMA_CMD);
4090 /* issue r/w command */
4091 ap->ops->exec_command(ap, &qc->tf);
4095 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
4096 * @qc: Info associated with this ATA transaction.
4099 * spin_lock_irqsave(host_set lock)
4102 static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
4104 struct ata_port *ap = qc->ap;
4105 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4108 /* start host DMA transaction */
4109 dmactl = readb(mmio + ATA_DMA_CMD);
4110 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
4112 /* Strictly, one may wish to issue a readb() here, to
4113 * flush the mmio write. However, control also passes
4114 * to the hardware at this point, and it will interrupt
4115 * us when we are to resume control. So, in effect,
4116 * we don't care when the mmio write flushes.
4117 * Further, a read of the DMA status register _immediately_
4118 * following the write may not be what certain flaky hardware
4119 * is expected, so I think it is best to not add a readb()
4120 * without first all the MMIO ATA cards/mobos.
4121 * Or maybe I'm just being paranoid.
4126 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
4127 * @qc: Info associated with this ATA transaction.
4130 * spin_lock_irqsave(host_set lock)
4133 static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
4135 struct ata_port *ap = qc->ap;
4136 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
4139 /* load PRD table addr. */
4140 outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
4142 /* specify data direction, triple-check start bit is clear */
4143 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4144 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
4146 dmactl |= ATA_DMA_WR;
4147 outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4149 /* issue r/w command */
4150 ap->ops->exec_command(ap, &qc->tf);
4154 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
4155 * @qc: Info associated with this ATA transaction.
4158 * spin_lock_irqsave(host_set lock)
4161 static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
4163 struct ata_port *ap = qc->ap;
4166 /* start host DMA transaction */
4167 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4168 outb(dmactl | ATA_DMA_START,
4169 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4174 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
4175 * @qc: Info associated with this ATA transaction.
4177 * Writes the ATA_DMA_START flag to the DMA command register.
4179 * May be used as the bmdma_start() entry in ata_port_operations.
4182 * spin_lock_irqsave(host_set lock)
4184 void ata_bmdma_start(struct ata_queued_cmd *qc)
4186 if (qc->ap->flags & ATA_FLAG_MMIO)
4187 ata_bmdma_start_mmio(qc);
4189 ata_bmdma_start_pio(qc);
4194 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
4195 * @qc: Info associated with this ATA transaction.
4197 * Writes address of PRD table to device's PRD Table Address
4198 * register, sets the DMA control register, and calls
4199 * ops->exec_command() to start the transfer.
4201 * May be used as the bmdma_setup() entry in ata_port_operations.
4204 * spin_lock_irqsave(host_set lock)
4206 void ata_bmdma_setup(struct ata_queued_cmd *qc)
4208 if (qc->ap->flags & ATA_FLAG_MMIO)
4209 ata_bmdma_setup_mmio(qc);
4211 ata_bmdma_setup_pio(qc);
4216 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
4217 * @ap: Port associated with this ATA transaction.
4219 * Clear interrupt and error flags in DMA status register.
4221 * May be used as the irq_clear() entry in ata_port_operations.
4224 * spin_lock_irqsave(host_set lock)
4227 void ata_bmdma_irq_clear(struct ata_port *ap)
4229 if (ap->flags & ATA_FLAG_MMIO) {
4230 void __iomem *mmio = ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
4231 writeb(readb(mmio), mmio);
4233 unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
4234 outb(inb(addr), addr);
4241 * ata_bmdma_status - Read PCI IDE BMDMA status
4242 * @ap: Port associated with this ATA transaction.
4244 * Read and return BMDMA status register.
4246 * May be used as the bmdma_status() entry in ata_port_operations.
4249 * spin_lock_irqsave(host_set lock)
4252 u8 ata_bmdma_status(struct ata_port *ap)
4255 if (ap->flags & ATA_FLAG_MMIO) {
4256 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4257 host_stat = readb(mmio + ATA_DMA_STATUS);
4259 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
4265 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4266 * @qc: Command we are ending DMA for
4268 * Clears the ATA_DMA_START flag in the dma control register
4270 * May be used as the bmdma_stop() entry in ata_port_operations.
4273 * spin_lock_irqsave(host_set lock)
4276 void ata_bmdma_stop(struct ata_queued_cmd *qc)
4278 struct ata_port *ap = qc->ap;
4279 if (ap->flags & ATA_FLAG_MMIO) {
4280 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4282 /* clear start/stop bit */
4283 writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
4284 mmio + ATA_DMA_CMD);
4286 /* clear start/stop bit */
4287 outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
4288 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4291 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4292 ata_altstatus(ap); /* dummy read */
4296 * ata_host_intr - Handle host interrupt for given (port, task)
4297 * @ap: Port on which interrupt arrived (possibly...)
4298 * @qc: Taskfile currently active in engine
4300 * Handle host interrupt for given queued command. Currently,
4301 * only DMA interrupts are handled. All other commands are
4302 * handled via polling with interrupts disabled (nIEN bit).
4305 * spin_lock_irqsave(host_set lock)
4308 * One if interrupt was handled, zero if not (shared irq).
4311 inline unsigned int ata_host_intr (struct ata_port *ap,
4312 struct ata_queued_cmd *qc)
4314 u8 status, host_stat = 0;
4316 VPRINTK("ata%u: protocol %d task_state %d\n",
4317 ap->id, qc->tf.protocol, ap->hsm_task_state);
4319 /* Check whether we are expecting interrupt in this state */
4320 switch (ap->hsm_task_state) {
4322 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4323 * The flag was turned on only for atapi devices.
4324 * No need to check is_atapi_taskfile(&qc->tf) again.
4326 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4330 if (qc->tf.protocol == ATA_PROT_DMA ||
4331 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
4332 /* check status of DMA engine */
4333 host_stat = ap->ops->bmdma_status(ap);
4334 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4336 /* if it's not our irq... */
4337 if (!(host_stat & ATA_DMA_INTR))
4340 /* before we do anything else, clear DMA-Start bit */
4341 ap->ops->bmdma_stop(qc);
4343 if (unlikely(host_stat & ATA_DMA_ERR)) {
4344 /* error when transfering data to/from memory */
4345 qc->err_mask |= AC_ERR_HOST_BUS;
4346 ap->hsm_task_state = HSM_ST_ERR;
4356 /* check altstatus */
4357 status = ata_altstatus(ap);
4358 if (status & ATA_BUSY)
4361 /* check main status, clearing INTRQ */
4362 status = ata_chk_status(ap);
4363 if (unlikely(status & ATA_BUSY))
4366 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4367 ap->id, qc->tf.protocol, ap->hsm_task_state, status);
4369 /* ack bmdma irq events */
4370 ap->ops->irq_clear(ap);
4373 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4374 qc->err_mask |= AC_ERR_DEV;
4375 ap->hsm_task_state = HSM_ST_ERR;
4379 switch (ap->hsm_task_state) {
4381 /* Some pre-ATAPI-4 devices assert INTRQ
4382 * at this state when ready to receive CDB.
4385 /* check device status */
4386 if (unlikely((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ)) {
4387 /* Wrong status. Let EH handle this */
4388 qc->err_mask |= AC_ERR_HSM;
4389 ap->hsm_task_state = HSM_ST_ERR;
4393 atapi_send_cdb(ap, qc);
4398 /* complete command or read/write the data register */
4399 if (qc->tf.protocol == ATA_PROT_ATAPI) {
4400 /* ATAPI PIO protocol */
4401 if ((status & ATA_DRQ) == 0) {
4402 /* no more data to transfer */
4403 ap->hsm_task_state = HSM_ST_LAST;
4407 atapi_pio_bytes(qc);
4409 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
4410 /* bad ireason reported by device */
4414 /* ATA PIO protocol */
4415 if (unlikely((status & ATA_DRQ) == 0)) {
4416 /* handle BSY=0, DRQ=0 as error */
4417 qc->err_mask |= AC_ERR_HSM;
4418 ap->hsm_task_state = HSM_ST_ERR;
4422 ata_pio_sectors(qc);
4424 if (ap->hsm_task_state == HSM_ST_LAST &&
4425 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
4428 status = ata_chk_status(ap);
4433 ata_altstatus(ap); /* flush */
4437 if (unlikely(status & ATA_DRQ)) {
4438 /* handle DRQ=1 as error */
4439 qc->err_mask |= AC_ERR_HSM;
4440 ap->hsm_task_state = HSM_ST_ERR;
4444 /* no more data to transfer */
4445 DPRINTK("ata%u: command complete, drv_stat 0x%x\n",
4448 ap->hsm_task_state = HSM_ST_IDLE;
4450 /* complete taskfile transaction */
4451 qc->err_mask |= ac_err_mask(status);
4452 ata_qc_complete(qc);
4456 if (qc->tf.command != ATA_CMD_PACKET)
4457 printk(KERN_ERR "ata%u: command error, drv_stat 0x%x host_stat 0x%x\n",
4458 ap->id, status, host_stat);
4460 /* make sure qc->err_mask is available to
4461 * know what's wrong and recover
4463 WARN_ON(qc->err_mask == 0);
4465 ap->hsm_task_state = HSM_ST_IDLE;
4466 ata_qc_complete(qc);
4472 return 1; /* irq handled */
4475 ap->stats.idle_irq++;
4478 if ((ap->stats.idle_irq % 1000) == 0) {
4480 ata_irq_ack(ap, 0); /* debug trap */
4481 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4484 return 0; /* irq not handled */
4488 * ata_interrupt - Default ATA host interrupt handler
4489 * @irq: irq line (unused)
4490 * @dev_instance: pointer to our ata_host_set information structure
4493 * Default interrupt handler for PCI IDE devices. Calls
4494 * ata_host_intr() for each port that is not disabled.
4497 * Obtains host_set lock during operation.
4500 * IRQ_NONE or IRQ_HANDLED.
4503 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4505 struct ata_host_set *host_set = dev_instance;
4507 unsigned int handled = 0;
4508 unsigned long flags;
4510 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4511 spin_lock_irqsave(&host_set->lock, flags);
4513 for (i = 0; i < host_set->n_ports; i++) {
4514 struct ata_port *ap;
4516 ap = host_set->ports[i];
4518 !(ap->flags & ATA_FLAG_PORT_DISABLED)) {
4519 struct ata_queued_cmd *qc;
4521 qc = ata_qc_from_tag(ap, ap->active_tag);
4522 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
4523 (qc->flags & ATA_QCFLAG_ACTIVE))
4524 handled |= ata_host_intr(ap, qc);
4528 spin_unlock_irqrestore(&host_set->lock, flags);
4530 return IRQ_RETVAL(handled);
4534 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4535 * without filling any other registers
4537 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4540 struct ata_taskfile tf;
4543 ata_tf_init(ap, &tf, dev->devno);
4546 tf.flags |= ATA_TFLAG_DEVICE;
4547 tf.protocol = ATA_PROT_NODATA;
4549 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4551 printk(KERN_ERR "%s: ata command failed: %d\n",
4557 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4561 if (!ata_try_flush_cache(dev))
4564 if (ata_id_has_flush_ext(dev->id))
4565 cmd = ATA_CMD_FLUSH_EXT;
4567 cmd = ATA_CMD_FLUSH;
4569 return ata_do_simple_cmd(ap, dev, cmd);
4572 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4574 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4577 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4579 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4583 * ata_device_resume - wakeup a previously suspended devices
4584 * @ap: port the device is connected to
4585 * @dev: the device to resume
4587 * Kick the drive back into action, by sending it an idle immediate
4588 * command and making sure its transfer mode matches between drive
4592 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4594 if (ap->flags & ATA_FLAG_SUSPENDED) {
4595 ap->flags &= ~ATA_FLAG_SUSPENDED;
4598 if (!ata_dev_present(dev))
4600 if (dev->class == ATA_DEV_ATA)
4601 ata_start_drive(ap, dev);
4607 * ata_device_suspend - prepare a device for suspend
4608 * @ap: port the device is connected to
4609 * @dev: the device to suspend
4611 * Flush the cache on the drive, if appropriate, then issue a
4612 * standbynow command.
4614 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
4616 if (!ata_dev_present(dev))
4618 if (dev->class == ATA_DEV_ATA)
4619 ata_flush_cache(ap, dev);
4621 ata_standby_drive(ap, dev);
4622 ap->flags |= ATA_FLAG_SUSPENDED;
4627 * ata_port_start - Set port up for dma.
4628 * @ap: Port to initialize
4630 * Called just after data structures for each port are
4631 * initialized. Allocates space for PRD table.
4633 * May be used as the port_start() entry in ata_port_operations.
4636 * Inherited from caller.
4639 int ata_port_start (struct ata_port *ap)
4641 struct device *dev = ap->host_set->dev;
4644 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4648 rc = ata_pad_alloc(ap, dev);
4650 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4654 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4661 * ata_port_stop - Undo ata_port_start()
4662 * @ap: Port to shut down
4664 * Frees the PRD table.
4666 * May be used as the port_stop() entry in ata_port_operations.
4669 * Inherited from caller.
4672 void ata_port_stop (struct ata_port *ap)
4674 struct device *dev = ap->host_set->dev;
4676 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4677 ata_pad_free(ap, dev);
4680 void ata_host_stop (struct ata_host_set *host_set)
4682 if (host_set->mmio_base)
4683 iounmap(host_set->mmio_base);
4688 * ata_host_remove - Unregister SCSI host structure with upper layers
4689 * @ap: Port to unregister
4690 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4693 * Inherited from caller.
4696 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4698 struct Scsi_Host *sh = ap->host;
4703 scsi_remove_host(sh);
4705 ap->ops->port_stop(ap);
4709 * ata_host_init - Initialize an ata_port structure
4710 * @ap: Structure to initialize
4711 * @host: associated SCSI mid-layer structure
4712 * @host_set: Collection of hosts to which @ap belongs
4713 * @ent: Probe information provided by low-level driver
4714 * @port_no: Port number associated with this ata_port
4716 * Initialize a new ata_port structure, and its associated
4720 * Inherited from caller.
4723 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4724 struct ata_host_set *host_set,
4725 const struct ata_probe_ent *ent, unsigned int port_no)
4731 host->max_channel = 1;
4732 host->unique_id = ata_unique_id++;
4733 host->max_cmd_len = 12;
4735 ap->flags = ATA_FLAG_PORT_DISABLED;
4736 ap->id = host->unique_id;
4738 ap->ctl = ATA_DEVCTL_OBS;
4739 ap->host_set = host_set;
4740 ap->port_no = port_no;
4742 ent->legacy_mode ? ent->hard_port_no : port_no;
4743 ap->pio_mask = ent->pio_mask;
4744 ap->mwdma_mask = ent->mwdma_mask;
4745 ap->udma_mask = ent->udma_mask;
4746 ap->flags |= ent->host_flags;
4747 ap->ops = ent->port_ops;
4748 ap->cbl = ATA_CBL_NONE;
4749 ap->active_tag = ATA_TAG_POISON;
4750 ap->last_ctl = 0xFF;
4752 INIT_WORK(&ap->pio_task, ata_pio_task, ap);
4753 INIT_LIST_HEAD(&ap->eh_done_q);
4755 for (i = 0; i < ATA_MAX_DEVICES; i++)
4756 ap->device[i].devno = i;
4759 ap->stats.unhandled_irq = 1;
4760 ap->stats.idle_irq = 1;
4763 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4767 * ata_host_add - Attach low-level ATA driver to system
4768 * @ent: Information provided by low-level driver
4769 * @host_set: Collections of ports to which we add
4770 * @port_no: Port number associated with this host
4772 * Attach low-level ATA driver to system.
4775 * PCI/etc. bus probe sem.
4778 * New ata_port on success, for NULL on error.
4781 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4782 struct ata_host_set *host_set,
4783 unsigned int port_no)
4785 struct Scsi_Host *host;
4786 struct ata_port *ap;
4790 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4794 ap = (struct ata_port *) &host->hostdata[0];
4796 ata_host_init(ap, host, host_set, ent, port_no);
4798 rc = ap->ops->port_start(ap);
4805 scsi_host_put(host);
4810 * ata_device_add - Register hardware device with ATA and SCSI layers
4811 * @ent: Probe information describing hardware device to be registered
4813 * This function processes the information provided in the probe
4814 * information struct @ent, allocates the necessary ATA and SCSI
4815 * host information structures, initializes them, and registers
4816 * everything with requisite kernel subsystems.
4818 * This function requests irqs, probes the ATA bus, and probes
4822 * PCI/etc. bus probe sem.
4825 * Number of ports registered. Zero on error (no ports registered).
4828 int ata_device_add(const struct ata_probe_ent *ent)
4830 unsigned int count = 0, i;
4831 struct device *dev = ent->dev;
4832 struct ata_host_set *host_set;
4835 /* alloc a container for our list of ATA ports (buses) */
4836 host_set = kzalloc(sizeof(struct ata_host_set) +
4837 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4840 spin_lock_init(&host_set->lock);
4842 host_set->dev = dev;
4843 host_set->n_ports = ent->n_ports;
4844 host_set->irq = ent->irq;
4845 host_set->mmio_base = ent->mmio_base;
4846 host_set->private_data = ent->private_data;
4847 host_set->ops = ent->port_ops;
4849 /* register each port bound to this device */
4850 for (i = 0; i < ent->n_ports; i++) {
4851 struct ata_port *ap;
4852 unsigned long xfer_mode_mask;
4854 ap = ata_host_add(ent, host_set, i);
4858 host_set->ports[i] = ap;
4859 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4860 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4861 (ap->pio_mask << ATA_SHIFT_PIO);
4863 /* print per-port info to dmesg */
4864 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4865 "bmdma 0x%lX irq %lu\n",
4867 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4868 ata_mode_string(xfer_mode_mask),
4869 ap->ioaddr.cmd_addr,
4870 ap->ioaddr.ctl_addr,
4871 ap->ioaddr.bmdma_addr,
4875 host_set->ops->irq_clear(ap);
4882 /* obtain irq, that is shared between channels */
4883 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4884 DRV_NAME, host_set))
4887 /* perform each probe synchronously */
4888 DPRINTK("probe begin\n");
4889 for (i = 0; i < count; i++) {
4890 struct ata_port *ap;
4893 ap = host_set->ports[i];
4895 DPRINTK("ata%u: bus probe begin\n", ap->id);
4896 rc = ata_bus_probe(ap);
4897 DPRINTK("ata%u: bus probe end\n", ap->id);
4900 /* FIXME: do something useful here?
4901 * Current libata behavior will
4902 * tear down everything when
4903 * the module is removed
4904 * or the h/w is unplugged.
4908 rc = scsi_add_host(ap->host, dev);
4910 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4912 /* FIXME: do something useful here */
4913 /* FIXME: handle unconditional calls to
4914 * scsi_scan_host and ata_host_remove, below,
4920 /* probes are done, now scan each port's disk(s) */
4921 DPRINTK("host probe begin\n");
4922 for (i = 0; i < count; i++) {
4923 struct ata_port *ap = host_set->ports[i];
4925 ata_scsi_scan_host(ap);
4928 dev_set_drvdata(dev, host_set);
4930 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4931 return ent->n_ports; /* success */
4934 for (i = 0; i < count; i++) {
4935 ata_host_remove(host_set->ports[i], 1);
4936 scsi_host_put(host_set->ports[i]->host);
4940 VPRINTK("EXIT, returning 0\n");
4945 * ata_host_set_remove - PCI layer callback for device removal
4946 * @host_set: ATA host set that was removed
4948 * Unregister all objects associated with this host set. Free those
4952 * Inherited from calling layer (may sleep).
4955 void ata_host_set_remove(struct ata_host_set *host_set)
4957 struct ata_port *ap;
4960 for (i = 0; i < host_set->n_ports; i++) {
4961 ap = host_set->ports[i];
4962 scsi_remove_host(ap->host);
4965 free_irq(host_set->irq, host_set);
4967 for (i = 0; i < host_set->n_ports; i++) {
4968 ap = host_set->ports[i];
4970 ata_scsi_release(ap->host);
4972 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4973 struct ata_ioports *ioaddr = &ap->ioaddr;
4975 if (ioaddr->cmd_addr == 0x1f0)
4976 release_region(0x1f0, 8);
4977 else if (ioaddr->cmd_addr == 0x170)
4978 release_region(0x170, 8);
4981 scsi_host_put(ap->host);
4984 if (host_set->ops->host_stop)
4985 host_set->ops->host_stop(host_set);
4991 * ata_scsi_release - SCSI layer callback hook for host unload
4992 * @host: libata host to be unloaded
4994 * Performs all duties necessary to shut down a libata port...
4995 * Kill port kthread, disable port, and release resources.
4998 * Inherited from SCSI layer.
5004 int ata_scsi_release(struct Scsi_Host *host)
5006 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
5010 ap->ops->port_disable(ap);
5011 ata_host_remove(ap, 0);
5018 * ata_std_ports - initialize ioaddr with standard port offsets.
5019 * @ioaddr: IO address structure to be initialized
5021 * Utility function which initializes data_addr, error_addr,
5022 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5023 * device_addr, status_addr, and command_addr to standard offsets
5024 * relative to cmd_addr.
5026 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5029 void ata_std_ports(struct ata_ioports *ioaddr)
5031 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
5032 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
5033 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
5034 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
5035 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
5036 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
5037 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
5038 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
5039 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
5040 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
5046 void ata_pci_host_stop (struct ata_host_set *host_set)
5048 struct pci_dev *pdev = to_pci_dev(host_set->dev);
5050 pci_iounmap(pdev, host_set->mmio_base);
5054 * ata_pci_remove_one - PCI layer callback for device removal
5055 * @pdev: PCI device that was removed
5057 * PCI layer indicates to libata via this hook that
5058 * hot-unplug or module unload event has occurred.
5059 * Handle this by unregistering all objects associated
5060 * with this PCI device. Free those objects. Then finally
5061 * release PCI resources and disable device.
5064 * Inherited from PCI layer (may sleep).
5067 void ata_pci_remove_one (struct pci_dev *pdev)
5069 struct device *dev = pci_dev_to_dev(pdev);
5070 struct ata_host_set *host_set = dev_get_drvdata(dev);
5072 ata_host_set_remove(host_set);
5073 pci_release_regions(pdev);
5074 pci_disable_device(pdev);
5075 dev_set_drvdata(dev, NULL);
5078 /* move to PCI subsystem */
5079 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
5081 unsigned long tmp = 0;
5083 switch (bits->width) {
5086 pci_read_config_byte(pdev, bits->reg, &tmp8);
5092 pci_read_config_word(pdev, bits->reg, &tmp16);
5098 pci_read_config_dword(pdev, bits->reg, &tmp32);
5109 return (tmp == bits->val) ? 1 : 0;
5112 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
5114 pci_save_state(pdev);
5115 pci_disable_device(pdev);
5116 pci_set_power_state(pdev, PCI_D3hot);
5120 int ata_pci_device_resume(struct pci_dev *pdev)
5122 pci_set_power_state(pdev, PCI_D0);
5123 pci_restore_state(pdev);
5124 pci_enable_device(pdev);
5125 pci_set_master(pdev);
5128 #endif /* CONFIG_PCI */
5131 static int __init ata_init(void)
5133 ata_wq = create_workqueue("ata");
5137 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5141 static void __exit ata_exit(void)
5143 destroy_workqueue(ata_wq);
5146 module_init(ata_init);
5147 module_exit(ata_exit);
5149 static unsigned long ratelimit_time;
5150 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5152 int ata_ratelimit(void)
5155 unsigned long flags;
5157 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5159 if (time_after(jiffies, ratelimit_time)) {
5161 ratelimit_time = jiffies + (HZ/5);
5165 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5171 * libata is essentially a library of internal helper functions for
5172 * low-level ATA host controller drivers. As such, the API/ABI is
5173 * likely to change as new drivers are added and updated.
5174 * Do not depend on ABI/API stability.
5177 EXPORT_SYMBOL_GPL(ata_std_bios_param);
5178 EXPORT_SYMBOL_GPL(ata_std_ports);
5179 EXPORT_SYMBOL_GPL(ata_device_add);
5180 EXPORT_SYMBOL_GPL(ata_host_set_remove);
5181 EXPORT_SYMBOL_GPL(ata_sg_init);
5182 EXPORT_SYMBOL_GPL(ata_sg_init_one);
5183 EXPORT_SYMBOL_GPL(__ata_qc_complete);
5184 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
5185 EXPORT_SYMBOL_GPL(ata_eng_timeout);
5186 EXPORT_SYMBOL_GPL(ata_tf_load);
5187 EXPORT_SYMBOL_GPL(ata_tf_read);
5188 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5189 EXPORT_SYMBOL_GPL(ata_std_dev_select);
5190 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5191 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5192 EXPORT_SYMBOL_GPL(ata_check_status);
5193 EXPORT_SYMBOL_GPL(ata_altstatus);
5194 EXPORT_SYMBOL_GPL(ata_exec_command);
5195 EXPORT_SYMBOL_GPL(ata_port_start);
5196 EXPORT_SYMBOL_GPL(ata_port_stop);
5197 EXPORT_SYMBOL_GPL(ata_host_stop);
5198 EXPORT_SYMBOL_GPL(ata_interrupt);
5199 EXPORT_SYMBOL_GPL(ata_qc_prep);
5200 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5201 EXPORT_SYMBOL_GPL(ata_bmdma_start);
5202 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5203 EXPORT_SYMBOL_GPL(ata_bmdma_status);
5204 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5205 EXPORT_SYMBOL_GPL(ata_port_probe);
5206 EXPORT_SYMBOL_GPL(sata_phy_reset);
5207 EXPORT_SYMBOL_GPL(__sata_phy_reset);
5208 EXPORT_SYMBOL_GPL(ata_bus_reset);
5209 EXPORT_SYMBOL_GPL(ata_std_probeinit);
5210 EXPORT_SYMBOL_GPL(ata_std_softreset);
5211 EXPORT_SYMBOL_GPL(sata_std_hardreset);
5212 EXPORT_SYMBOL_GPL(ata_std_postreset);
5213 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5214 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5215 EXPORT_SYMBOL_GPL(ata_port_disable);
5216 EXPORT_SYMBOL_GPL(ata_ratelimit);
5217 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5218 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5219 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5220 EXPORT_SYMBOL_GPL(ata_scsi_timed_out);
5221 EXPORT_SYMBOL_GPL(ata_scsi_error);
5222 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5223 EXPORT_SYMBOL_GPL(ata_scsi_release);
5224 EXPORT_SYMBOL_GPL(ata_host_intr);
5225 EXPORT_SYMBOL_GPL(ata_dev_classify);
5226 EXPORT_SYMBOL_GPL(ata_id_string);
5227 EXPORT_SYMBOL_GPL(ata_id_c_string);
5228 EXPORT_SYMBOL_GPL(ata_dev_config);
5229 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5230 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5231 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
5233 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5234 EXPORT_SYMBOL_GPL(ata_timing_compute);
5235 EXPORT_SYMBOL_GPL(ata_timing_merge);
5238 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5239 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5240 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5241 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5242 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5243 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5244 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5245 #endif /* CONFIG_PCI */
5247 EXPORT_SYMBOL_GPL(ata_device_suspend);
5248 EXPORT_SYMBOL_GPL(ata_device_resume);
5249 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5250 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);