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 void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev);
70 static unsigned int ata_unique_id = 1;
71 static struct workqueue_struct *ata_wq;
73 int atapi_enabled = 1;
74 module_param(atapi_enabled, int, 0444);
75 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
78 module_param_named(fua, libata_fua, int, 0444);
79 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
81 MODULE_AUTHOR("Jeff Garzik");
82 MODULE_DESCRIPTION("Library module for ATA devices");
83 MODULE_LICENSE("GPL");
84 MODULE_VERSION(DRV_VERSION);
88 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
89 * @tf: Taskfile to convert
90 * @fis: Buffer into which data will output
91 * @pmp: Port multiplier port
93 * Converts a standard ATA taskfile to a Serial ATA
94 * FIS structure (Register - Host to Device).
97 * Inherited from caller.
100 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
102 fis[0] = 0x27; /* Register - Host to Device FIS */
103 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
104 bit 7 indicates Command FIS */
105 fis[2] = tf->command;
106 fis[3] = tf->feature;
113 fis[8] = tf->hob_lbal;
114 fis[9] = tf->hob_lbam;
115 fis[10] = tf->hob_lbah;
116 fis[11] = tf->hob_feature;
119 fis[13] = tf->hob_nsect;
130 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
131 * @fis: Buffer from which data will be input
132 * @tf: Taskfile to output
134 * Converts a serial ATA FIS structure to a standard ATA taskfile.
137 * Inherited from caller.
140 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
142 tf->command = fis[2]; /* status */
143 tf->feature = fis[3]; /* error */
150 tf->hob_lbal = fis[8];
151 tf->hob_lbam = fis[9];
152 tf->hob_lbah = fis[10];
155 tf->hob_nsect = fis[13];
158 static const u8 ata_rw_cmds[] = {
162 ATA_CMD_READ_MULTI_EXT,
163 ATA_CMD_WRITE_MULTI_EXT,
167 ATA_CMD_WRITE_MULTI_FUA_EXT,
171 ATA_CMD_PIO_READ_EXT,
172 ATA_CMD_PIO_WRITE_EXT,
185 ATA_CMD_WRITE_FUA_EXT
189 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
190 * @qc: command to examine and configure
192 * Examine the device configuration and tf->flags to calculate
193 * the proper read/write commands and protocol to use.
198 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
200 struct ata_taskfile *tf = &qc->tf;
201 struct ata_device *dev = qc->dev;
204 int index, fua, lba48, write;
206 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
207 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
208 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
210 if (dev->flags & ATA_DFLAG_PIO) {
211 tf->protocol = ATA_PROT_PIO;
212 index = dev->multi_count ? 0 : 8;
213 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
214 /* Unable to use DMA due to host limitation */
215 tf->protocol = ATA_PROT_PIO;
216 index = dev->multi_count ? 0 : 8;
218 tf->protocol = ATA_PROT_DMA;
222 cmd = ata_rw_cmds[index + fua + lba48 + write];
231 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
232 * @pio_mask: pio_mask
233 * @mwdma_mask: mwdma_mask
234 * @udma_mask: udma_mask
236 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
237 * unsigned int xfer_mask.
245 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
246 unsigned int mwdma_mask,
247 unsigned int udma_mask)
249 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
250 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
251 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
255 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
256 * @xfer_mask: xfer_mask to unpack
257 * @pio_mask: resulting pio_mask
258 * @mwdma_mask: resulting mwdma_mask
259 * @udma_mask: resulting udma_mask
261 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
262 * Any NULL distination masks will be ignored.
264 static void ata_unpack_xfermask(unsigned int xfer_mask,
265 unsigned int *pio_mask,
266 unsigned int *mwdma_mask,
267 unsigned int *udma_mask)
270 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
272 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
274 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
277 static const struct ata_xfer_ent {
278 unsigned int shift, bits;
281 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
282 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
283 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
288 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
289 * @xfer_mask: xfer_mask of interest
291 * Return matching XFER_* value for @xfer_mask. Only the highest
292 * bit of @xfer_mask is considered.
298 * Matching XFER_* value, 0 if no match found.
300 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
302 int highbit = fls(xfer_mask) - 1;
303 const struct ata_xfer_ent *ent;
305 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
306 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
307 return ent->base + highbit - ent->shift;
312 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
313 * @xfer_mode: XFER_* of interest
315 * Return matching xfer_mask for @xfer_mode.
321 * Matching xfer_mask, 0 if no match found.
323 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
325 const struct ata_xfer_ent *ent;
327 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
328 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
329 return 1 << (ent->shift + xfer_mode - ent->base);
334 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
335 * @xfer_mode: XFER_* of interest
337 * Return matching xfer_shift for @xfer_mode.
343 * Matching xfer_shift, -1 if no match found.
345 static int ata_xfer_mode2shift(unsigned int xfer_mode)
347 const struct ata_xfer_ent *ent;
349 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
350 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
356 * ata_mode_string - convert xfer_mask to string
357 * @xfer_mask: mask of bits supported; only highest bit counts.
359 * Determine string which represents the highest speed
360 * (highest bit in @modemask).
366 * Constant C string representing highest speed listed in
367 * @mode_mask, or the constant C string "<n/a>".
369 static const char *ata_mode_string(unsigned int xfer_mask)
371 static const char * const xfer_mode_str[] = {
391 highbit = fls(xfer_mask) - 1;
392 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
393 return xfer_mode_str[highbit];
397 static void ata_dev_disable(struct ata_port *ap, struct ata_device *dev)
399 if (ata_dev_present(dev)) {
400 printk(KERN_WARNING "ata%u: dev %u disabled\n",
407 * ata_pio_devchk - PATA device presence detection
408 * @ap: ATA channel to examine
409 * @device: Device to examine (starting at zero)
411 * This technique was originally described in
412 * Hale Landis's ATADRVR (www.ata-atapi.com), and
413 * later found its way into the ATA/ATAPI spec.
415 * Write a pattern to the ATA shadow registers,
416 * and if a device is present, it will respond by
417 * correctly storing and echoing back the
418 * ATA shadow register contents.
424 static unsigned int ata_pio_devchk(struct ata_port *ap,
427 struct ata_ioports *ioaddr = &ap->ioaddr;
430 ap->ops->dev_select(ap, device);
432 outb(0x55, ioaddr->nsect_addr);
433 outb(0xaa, ioaddr->lbal_addr);
435 outb(0xaa, ioaddr->nsect_addr);
436 outb(0x55, ioaddr->lbal_addr);
438 outb(0x55, ioaddr->nsect_addr);
439 outb(0xaa, ioaddr->lbal_addr);
441 nsect = inb(ioaddr->nsect_addr);
442 lbal = inb(ioaddr->lbal_addr);
444 if ((nsect == 0x55) && (lbal == 0xaa))
445 return 1; /* we found a device */
447 return 0; /* nothing found */
451 * ata_mmio_devchk - PATA device presence detection
452 * @ap: ATA channel to examine
453 * @device: Device to examine (starting at zero)
455 * This technique was originally described in
456 * Hale Landis's ATADRVR (www.ata-atapi.com), and
457 * later found its way into the ATA/ATAPI spec.
459 * Write a pattern to the ATA shadow registers,
460 * and if a device is present, it will respond by
461 * correctly storing and echoing back the
462 * ATA shadow register contents.
468 static unsigned int ata_mmio_devchk(struct ata_port *ap,
471 struct ata_ioports *ioaddr = &ap->ioaddr;
474 ap->ops->dev_select(ap, device);
476 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
477 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
479 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
480 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
482 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
483 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
485 nsect = readb((void __iomem *) ioaddr->nsect_addr);
486 lbal = readb((void __iomem *) ioaddr->lbal_addr);
488 if ((nsect == 0x55) && (lbal == 0xaa))
489 return 1; /* we found a device */
491 return 0; /* nothing found */
495 * ata_devchk - PATA device presence detection
496 * @ap: ATA channel to examine
497 * @device: Device to examine (starting at zero)
499 * Dispatch ATA device presence detection, depending
500 * on whether we are using PIO or MMIO to talk to the
501 * ATA shadow registers.
507 static unsigned int ata_devchk(struct ata_port *ap,
510 if (ap->flags & ATA_FLAG_MMIO)
511 return ata_mmio_devchk(ap, device);
512 return ata_pio_devchk(ap, device);
516 * ata_dev_classify - determine device type based on ATA-spec signature
517 * @tf: ATA taskfile register set for device to be identified
519 * Determine from taskfile register contents whether a device is
520 * ATA or ATAPI, as per "Signature and persistence" section
521 * of ATA/PI spec (volume 1, sect 5.14).
527 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
528 * the event of failure.
531 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
533 /* Apple's open source Darwin code hints that some devices only
534 * put a proper signature into the LBA mid/high registers,
535 * So, we only check those. It's sufficient for uniqueness.
538 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
539 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
540 DPRINTK("found ATA device by sig\n");
544 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
545 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
546 DPRINTK("found ATAPI device by sig\n");
547 return ATA_DEV_ATAPI;
550 DPRINTK("unknown device\n");
551 return ATA_DEV_UNKNOWN;
555 * ata_dev_try_classify - Parse returned ATA device signature
556 * @ap: ATA channel to examine
557 * @device: Device to examine (starting at zero)
558 * @r_err: Value of error register on completion
560 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
561 * an ATA/ATAPI-defined set of values is placed in the ATA
562 * shadow registers, indicating the results of device detection
565 * Select the ATA device, and read the values from the ATA shadow
566 * registers. Then parse according to the Error register value,
567 * and the spec-defined values examined by ata_dev_classify().
573 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
577 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
579 struct ata_taskfile tf;
583 ap->ops->dev_select(ap, device);
585 memset(&tf, 0, sizeof(tf));
587 ap->ops->tf_read(ap, &tf);
592 /* see if device passed diags */
595 else if ((device == 0) && (err == 0x81))
600 /* determine if device is ATA or ATAPI */
601 class = ata_dev_classify(&tf);
603 if (class == ATA_DEV_UNKNOWN)
605 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
611 * ata_id_string - Convert IDENTIFY DEVICE page into string
612 * @id: IDENTIFY DEVICE results we will examine
613 * @s: string into which data is output
614 * @ofs: offset into identify device page
615 * @len: length of string to return. must be an even number.
617 * The strings in the IDENTIFY DEVICE page are broken up into
618 * 16-bit chunks. Run through the string, and output each
619 * 8-bit chunk linearly, regardless of platform.
625 void ata_id_string(const u16 *id, unsigned char *s,
626 unsigned int ofs, unsigned int len)
645 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
646 * @id: IDENTIFY DEVICE results we will examine
647 * @s: string into which data is output
648 * @ofs: offset into identify device page
649 * @len: length of string to return. must be an odd number.
651 * This function is identical to ata_id_string except that it
652 * trims trailing spaces and terminates the resulting string with
653 * null. @len must be actual maximum length (even number) + 1.
658 void ata_id_c_string(const u16 *id, unsigned char *s,
659 unsigned int ofs, unsigned int len)
665 ata_id_string(id, s, ofs, len - 1);
667 p = s + strnlen(s, len - 1);
668 while (p > s && p[-1] == ' ')
673 static u64 ata_id_n_sectors(const u16 *id)
675 if (ata_id_has_lba(id)) {
676 if (ata_id_has_lba48(id))
677 return ata_id_u64(id, 100);
679 return ata_id_u32(id, 60);
681 if (ata_id_current_chs_valid(id))
682 return ata_id_u32(id, 57);
684 return id[1] * id[3] * id[6];
689 * ata_noop_dev_select - Select device 0/1 on ATA bus
690 * @ap: ATA channel to manipulate
691 * @device: ATA device (numbered from zero) to select
693 * This function performs no actual function.
695 * May be used as the dev_select() entry in ata_port_operations.
700 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
706 * ata_std_dev_select - Select device 0/1 on ATA bus
707 * @ap: ATA channel to manipulate
708 * @device: ATA device (numbered from zero) to select
710 * Use the method defined in the ATA specification to
711 * make either device 0, or device 1, active on the
712 * ATA channel. Works with both PIO and MMIO.
714 * May be used as the dev_select() entry in ata_port_operations.
720 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
725 tmp = ATA_DEVICE_OBS;
727 tmp = ATA_DEVICE_OBS | ATA_DEV1;
729 if (ap->flags & ATA_FLAG_MMIO) {
730 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
732 outb(tmp, ap->ioaddr.device_addr);
734 ata_pause(ap); /* needed; also flushes, for mmio */
738 * ata_dev_select - Select device 0/1 on ATA bus
739 * @ap: ATA channel to manipulate
740 * @device: ATA device (numbered from zero) to select
741 * @wait: non-zero to wait for Status register BSY bit to clear
742 * @can_sleep: non-zero if context allows sleeping
744 * Use the method defined in the ATA specification to
745 * make either device 0, or device 1, active on the
748 * This is a high-level version of ata_std_dev_select(),
749 * which additionally provides the services of inserting
750 * the proper pauses and status polling, where needed.
756 void ata_dev_select(struct ata_port *ap, unsigned int device,
757 unsigned int wait, unsigned int can_sleep)
759 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
760 ap->id, device, wait);
765 ap->ops->dev_select(ap, device);
768 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
775 * ata_dump_id - IDENTIFY DEVICE info debugging output
776 * @id: IDENTIFY DEVICE page to dump
778 * Dump selected 16-bit words from the given IDENTIFY DEVICE
785 static inline void ata_dump_id(const u16 *id)
787 DPRINTK("49==0x%04x "
797 DPRINTK("80==0x%04x "
807 DPRINTK("88==0x%04x "
814 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
815 * @id: IDENTIFY data to compute xfer mask from
817 * Compute the xfermask for this device. This is not as trivial
818 * as it seems if we must consider early devices correctly.
820 * FIXME: pre IDE drive timing (do we care ?).
828 static unsigned int ata_id_xfermask(const u16 *id)
830 unsigned int pio_mask, mwdma_mask, udma_mask;
832 /* Usual case. Word 53 indicates word 64 is valid */
833 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
834 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
838 /* If word 64 isn't valid then Word 51 high byte holds
839 * the PIO timing number for the maximum. Turn it into
842 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
844 /* But wait.. there's more. Design your standards by
845 * committee and you too can get a free iordy field to
846 * process. However its the speeds not the modes that
847 * are supported... Note drivers using the timing API
848 * will get this right anyway
852 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
855 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
856 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
858 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
862 * ata_port_queue_task - Queue port_task
863 * @ap: The ata_port to queue port_task for
865 * Schedule @fn(@data) for execution after @delay jiffies using
866 * port_task. There is one port_task per port and it's the
867 * user(low level driver)'s responsibility to make sure that only
868 * one task is active at any given time.
870 * libata core layer takes care of synchronization between
871 * port_task and EH. ata_port_queue_task() may be ignored for EH
875 * Inherited from caller.
877 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
882 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
885 PREPARE_WORK(&ap->port_task, fn, data);
888 rc = queue_work(ata_wq, &ap->port_task);
890 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
892 /* rc == 0 means that another user is using port task */
897 * ata_port_flush_task - Flush port_task
898 * @ap: The ata_port to flush port_task for
900 * After this function completes, port_task is guranteed not to
901 * be running or scheduled.
904 * Kernel thread context (may sleep)
906 void ata_port_flush_task(struct ata_port *ap)
912 spin_lock_irqsave(&ap->host_set->lock, flags);
913 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
914 spin_unlock_irqrestore(&ap->host_set->lock, flags);
916 DPRINTK("flush #1\n");
917 flush_workqueue(ata_wq);
920 * At this point, if a task is running, it's guaranteed to see
921 * the FLUSH flag; thus, it will never queue pio tasks again.
924 if (!cancel_delayed_work(&ap->port_task)) {
925 DPRINTK("flush #2\n");
926 flush_workqueue(ata_wq);
929 spin_lock_irqsave(&ap->host_set->lock, flags);
930 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
931 spin_unlock_irqrestore(&ap->host_set->lock, flags);
936 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
938 struct completion *waiting = qc->private_data;
940 qc->ap->ops->tf_read(qc->ap, &qc->tf);
945 * ata_exec_internal - execute libata internal command
946 * @ap: Port to which the command is sent
947 * @dev: Device to which the command is sent
948 * @tf: Taskfile registers for the command and the result
949 * @dma_dir: Data tranfer direction of the command
950 * @buf: Data buffer of the command
951 * @buflen: Length of data buffer
953 * Executes libata internal command with timeout. @tf contains
954 * command on entry and result on return. Timeout and error
955 * conditions are reported via return value. No recovery action
956 * is taken after a command times out. It's caller's duty to
957 * clean up after timeout.
960 * None. Should be called with kernel context, might sleep.
964 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
965 struct ata_taskfile *tf,
966 int dma_dir, void *buf, unsigned int buflen)
968 u8 command = tf->command;
969 struct ata_queued_cmd *qc;
970 DECLARE_COMPLETION(wait);
972 unsigned int err_mask;
974 spin_lock_irqsave(&ap->host_set->lock, flags);
976 qc = ata_qc_new_init(ap, dev);
980 qc->dma_dir = dma_dir;
981 if (dma_dir != DMA_NONE) {
982 ata_sg_init_one(qc, buf, buflen);
983 qc->nsect = buflen / ATA_SECT_SIZE;
986 qc->private_data = &wait;
987 qc->complete_fn = ata_qc_complete_internal;
989 qc->err_mask = ata_qc_issue(qc);
993 spin_unlock_irqrestore(&ap->host_set->lock, flags);
995 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
996 ata_port_flush_task(ap);
998 spin_lock_irqsave(&ap->host_set->lock, flags);
1000 /* We're racing with irq here. If we lose, the
1001 * following test prevents us from completing the qc
1002 * again. If completion irq occurs after here but
1003 * before the caller cleans up, it will result in a
1004 * spurious interrupt. We can live with that.
1006 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1007 qc->err_mask = AC_ERR_TIMEOUT;
1008 ata_qc_complete(qc);
1009 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
1013 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1017 err_mask = qc->err_mask;
1021 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1022 * Until those drivers are fixed, we detect the condition
1023 * here, fail the command with AC_ERR_SYSTEM and reenable the
1026 * Note that this doesn't change any behavior as internal
1027 * command failure results in disabling the device in the
1028 * higher layer for LLDDs without new reset/EH callbacks.
1030 * Kill the following code as soon as those drivers are fixed.
1032 if (ap->flags & ATA_FLAG_PORT_DISABLED) {
1033 err_mask |= AC_ERR_SYSTEM;
1041 * ata_pio_need_iordy - check if iordy needed
1044 * Check if the current speed of the device requires IORDY. Used
1045 * by various controllers for chip configuration.
1048 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1051 int speed = adev->pio_mode - XFER_PIO_0;
1058 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1060 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1061 pio = adev->id[ATA_ID_EIDE_PIO];
1062 /* Is the speed faster than the drive allows non IORDY ? */
1064 /* This is cycle times not frequency - watch the logic! */
1065 if (pio > 240) /* PIO2 is 240nS per cycle */
1074 * ata_dev_read_id - Read ID data from the specified device
1075 * @ap: port on which target device resides
1076 * @dev: target device
1077 * @p_class: pointer to class of the target device (may be changed)
1078 * @post_reset: is this read ID post-reset?
1079 * @p_id: read IDENTIFY page (newly allocated)
1081 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1082 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1083 * devices. This function also takes care of EDD signature
1084 * misreporting (to be removed once EDD support is gone) and
1085 * issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
1088 * Kernel thread context (may sleep)
1091 * 0 on success, -errno otherwise.
1093 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
1094 unsigned int *p_class, int post_reset, u16 **p_id)
1096 unsigned int class = *p_class;
1097 unsigned int using_edd;
1098 struct ata_taskfile tf;
1099 unsigned int err_mask = 0;
1104 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1106 if (ap->ops->probe_reset ||
1107 ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
1112 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1114 id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
1117 reason = "out of memory";
1122 ata_tf_init(ap, &tf, dev->devno);
1126 tf.command = ATA_CMD_ID_ATA;
1129 tf.command = ATA_CMD_ID_ATAPI;
1133 reason = "unsupported class";
1137 tf.protocol = ATA_PROT_PIO;
1139 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
1140 id, sizeof(id[0]) * ATA_ID_WORDS);
1144 reason = "I/O error";
1146 if (err_mask & ~AC_ERR_DEV)
1150 * arg! EDD works for all test cases, but seems to return
1151 * the ATA signature for some ATAPI devices. Until the
1152 * reason for this is found and fixed, we fix up the mess
1153 * here. If IDENTIFY DEVICE returns command aborted
1154 * (as ATAPI devices do), then we issue an
1155 * IDENTIFY PACKET DEVICE.
1157 * ATA software reset (SRST, the default) does not appear
1158 * to have this problem.
1160 if ((using_edd) && (class == ATA_DEV_ATA)) {
1161 u8 err = tf.feature;
1162 if (err & ATA_ABORTED) {
1163 class = ATA_DEV_ATAPI;
1170 swap_buf_le16(id, ATA_ID_WORDS);
1173 if ((class == ATA_DEV_ATA) != ata_id_is_ata(id)) {
1175 reason = "device reports illegal type";
1179 if (post_reset && class == ATA_DEV_ATA) {
1181 * The exact sequence expected by certain pre-ATA4 drives is:
1184 * INITIALIZE DEVICE PARAMETERS
1186 * Some drives were very specific about that exact sequence.
1188 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1189 err_mask = ata_dev_init_params(ap, dev);
1192 reason = "INIT_DEV_PARAMS failed";
1196 /* current CHS translation info (id[53-58]) might be
1197 * changed. reread the identify device info.
1209 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1210 ap->id, dev->devno, reason);
1215 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1216 struct ata_device *dev)
1218 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1222 * ata_dev_configure - Configure the specified ATA/ATAPI device
1223 * @ap: Port on which target device resides
1224 * @dev: Target device to configure
1225 * @print_info: Enable device info printout
1227 * Configure @dev according to @dev->id. Generic and low-level
1228 * driver specific fixups are also applied.
1231 * Kernel thread context (may sleep)
1234 * 0 on success, -errno otherwise
1236 static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
1239 const u16 *id = dev->id;
1240 unsigned int xfer_mask;
1243 if (!ata_dev_present(dev)) {
1244 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1245 ap->id, dev->devno);
1249 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1251 /* print device capabilities */
1253 printk(KERN_DEBUG "ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1254 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1255 ap->id, dev->devno, id[49], id[82], id[83],
1256 id[84], id[85], id[86], id[87], id[88]);
1258 /* initialize to-be-configured parameters */
1260 dev->max_sectors = 0;
1268 * common ATA, ATAPI feature tests
1271 /* find max transfer mode; for printk only */
1272 xfer_mask = ata_id_xfermask(id);
1276 /* ATA-specific feature tests */
1277 if (dev->class == ATA_DEV_ATA) {
1278 dev->n_sectors = ata_id_n_sectors(id);
1280 if (ata_id_has_lba(id)) {
1281 const char *lba_desc;
1284 dev->flags |= ATA_DFLAG_LBA;
1285 if (ata_id_has_lba48(id)) {
1286 dev->flags |= ATA_DFLAG_LBA48;
1290 /* print device info to dmesg */
1292 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1293 "max %s, %Lu sectors: %s\n",
1295 ata_id_major_version(id),
1296 ata_mode_string(xfer_mask),
1297 (unsigned long long)dev->n_sectors,
1302 /* Default translation */
1303 dev->cylinders = id[1];
1305 dev->sectors = id[6];
1307 if (ata_id_current_chs_valid(id)) {
1308 /* Current CHS translation is valid. */
1309 dev->cylinders = id[54];
1310 dev->heads = id[55];
1311 dev->sectors = id[56];
1314 /* print device info to dmesg */
1316 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1317 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1319 ata_id_major_version(id),
1320 ata_mode_string(xfer_mask),
1321 (unsigned long long)dev->n_sectors,
1322 dev->cylinders, dev->heads, dev->sectors);
1328 /* ATAPI-specific feature tests */
1329 else if (dev->class == ATA_DEV_ATAPI) {
1330 rc = atapi_cdb_len(id);
1331 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1332 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1336 dev->cdb_len = (unsigned int) rc;
1338 /* print device info to dmesg */
1340 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1341 ap->id, dev->devno, ata_mode_string(xfer_mask));
1344 ap->host->max_cmd_len = 0;
1345 for (i = 0; i < ATA_MAX_DEVICES; i++)
1346 ap->host->max_cmd_len = max_t(unsigned int,
1347 ap->host->max_cmd_len,
1348 ap->device[i].cdb_len);
1350 /* limit bridge transfers to udma5, 200 sectors */
1351 if (ata_dev_knobble(ap, dev)) {
1353 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1354 ap->id, dev->devno);
1355 dev->udma_mask &= ATA_UDMA5;
1356 dev->max_sectors = ATA_MAX_SECTORS;
1359 if (ap->ops->dev_config)
1360 ap->ops->dev_config(ap, dev);
1362 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1366 DPRINTK("EXIT, err\n");
1371 * ata_bus_probe - Reset and probe ATA bus
1374 * Master ATA bus probing function. Initiates a hardware-dependent
1375 * bus reset, then attempts to identify any devices found on
1379 * PCI/etc. bus probe sem.
1382 * Zero on success, non-zero on error.
1385 static int ata_bus_probe(struct ata_port *ap)
1387 unsigned int classes[ATA_MAX_DEVICES];
1388 unsigned int i, rc, found = 0;
1392 /* reset and determine device classes */
1393 for (i = 0; i < ATA_MAX_DEVICES; i++)
1394 classes[i] = ATA_DEV_UNKNOWN;
1396 if (ap->ops->probe_reset) {
1397 rc = ap->ops->probe_reset(ap, classes);
1399 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1403 ap->ops->phy_reset(ap);
1405 if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
1406 for (i = 0; i < ATA_MAX_DEVICES; i++)
1407 classes[i] = ap->device[i].class;
1412 for (i = 0; i < ATA_MAX_DEVICES; i++)
1413 if (classes[i] == ATA_DEV_UNKNOWN)
1414 classes[i] = ATA_DEV_NONE;
1416 /* read IDENTIFY page and configure devices */
1417 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1418 struct ata_device *dev = &ap->device[i];
1420 dev->class = classes[i];
1422 if (!ata_dev_present(dev))
1425 WARN_ON(dev->id != NULL);
1426 if (ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id)) {
1427 dev->class = ATA_DEV_NONE;
1431 if (ata_dev_configure(ap, dev, 1)) {
1432 ata_dev_disable(ap, dev);
1440 goto err_out_disable;
1443 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1444 goto err_out_disable;
1449 ap->ops->port_disable(ap);
1454 * ata_port_probe - Mark port as enabled
1455 * @ap: Port for which we indicate enablement
1457 * Modify @ap data structure such that the system
1458 * thinks that the entire port is enabled.
1460 * LOCKING: host_set lock, or some other form of
1464 void ata_port_probe(struct ata_port *ap)
1466 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1470 * sata_print_link_status - Print SATA link status
1471 * @ap: SATA port to printk link status about
1473 * This function prints link speed and status of a SATA link.
1478 static void sata_print_link_status(struct ata_port *ap)
1483 if (!ap->ops->scr_read)
1486 sstatus = scr_read(ap, SCR_STATUS);
1488 if (sata_dev_present(ap)) {
1489 tmp = (sstatus >> 4) & 0xf;
1492 else if (tmp & (1 << 1))
1495 speed = "<unknown>";
1496 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1497 ap->id, speed, sstatus);
1499 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1505 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1506 * @ap: SATA port associated with target SATA PHY.
1508 * This function issues commands to standard SATA Sxxx
1509 * PHY registers, to wake up the phy (and device), and
1510 * clear any reset condition.
1513 * PCI/etc. bus probe sem.
1516 void __sata_phy_reset(struct ata_port *ap)
1519 unsigned long timeout = jiffies + (HZ * 5);
1521 if (ap->flags & ATA_FLAG_SATA_RESET) {
1522 /* issue phy wake/reset */
1523 scr_write_flush(ap, SCR_CONTROL, 0x301);
1524 /* Couldn't find anything in SATA I/II specs, but
1525 * AHCI-1.1 10.4.2 says at least 1 ms. */
1528 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1530 /* wait for phy to become ready, if necessary */
1533 sstatus = scr_read(ap, SCR_STATUS);
1534 if ((sstatus & 0xf) != 1)
1536 } while (time_before(jiffies, timeout));
1538 /* print link status */
1539 sata_print_link_status(ap);
1541 /* TODO: phy layer with polling, timeouts, etc. */
1542 if (sata_dev_present(ap))
1545 ata_port_disable(ap);
1547 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1550 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1551 ata_port_disable(ap);
1555 ap->cbl = ATA_CBL_SATA;
1559 * sata_phy_reset - Reset SATA bus.
1560 * @ap: SATA port associated with target SATA PHY.
1562 * This function resets the SATA bus, and then probes
1563 * the bus for devices.
1566 * PCI/etc. bus probe sem.
1569 void sata_phy_reset(struct ata_port *ap)
1571 __sata_phy_reset(ap);
1572 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1578 * ata_port_disable - Disable port.
1579 * @ap: Port to be disabled.
1581 * Modify @ap data structure such that the system
1582 * thinks that the entire port is disabled, and should
1583 * never attempt to probe or communicate with devices
1586 * LOCKING: host_set lock, or some other form of
1590 void ata_port_disable(struct ata_port *ap)
1592 ap->device[0].class = ATA_DEV_NONE;
1593 ap->device[1].class = ATA_DEV_NONE;
1594 ap->flags |= ATA_FLAG_PORT_DISABLED;
1598 * This mode timing computation functionality is ported over from
1599 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1602 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1603 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1604 * for PIO 5, which is a nonstandard extension and UDMA6, which
1605 * is currently supported only by Maxtor drives.
1608 static const struct ata_timing ata_timing[] = {
1610 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1611 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1612 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1613 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1615 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1616 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1617 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1619 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1621 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1622 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1623 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1625 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1626 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1627 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1629 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1630 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1631 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1633 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1634 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1635 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1637 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1642 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1643 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1645 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1647 q->setup = EZ(t->setup * 1000, T);
1648 q->act8b = EZ(t->act8b * 1000, T);
1649 q->rec8b = EZ(t->rec8b * 1000, T);
1650 q->cyc8b = EZ(t->cyc8b * 1000, T);
1651 q->active = EZ(t->active * 1000, T);
1652 q->recover = EZ(t->recover * 1000, T);
1653 q->cycle = EZ(t->cycle * 1000, T);
1654 q->udma = EZ(t->udma * 1000, UT);
1657 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1658 struct ata_timing *m, unsigned int what)
1660 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1661 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1662 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1663 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1664 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1665 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1666 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1667 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1670 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1672 const struct ata_timing *t;
1674 for (t = ata_timing; t->mode != speed; t++)
1675 if (t->mode == 0xFF)
1680 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1681 struct ata_timing *t, int T, int UT)
1683 const struct ata_timing *s;
1684 struct ata_timing p;
1690 if (!(s = ata_timing_find_mode(speed)))
1693 memcpy(t, s, sizeof(*s));
1696 * If the drive is an EIDE drive, it can tell us it needs extended
1697 * PIO/MW_DMA cycle timing.
1700 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1701 memset(&p, 0, sizeof(p));
1702 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1703 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1704 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1705 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1706 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1708 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1712 * Convert the timing to bus clock counts.
1715 ata_timing_quantize(t, t, T, UT);
1718 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1719 * S.M.A.R.T * and some other commands. We have to ensure that the
1720 * DMA cycle timing is slower/equal than the fastest PIO timing.
1723 if (speed > XFER_PIO_4) {
1724 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1725 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1729 * Lengthen active & recovery time so that cycle time is correct.
1732 if (t->act8b + t->rec8b < t->cyc8b) {
1733 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1734 t->rec8b = t->cyc8b - t->act8b;
1737 if (t->active + t->recover < t->cycle) {
1738 t->active += (t->cycle - (t->active + t->recover)) / 2;
1739 t->recover = t->cycle - t->active;
1745 static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1747 if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1750 if (dev->xfer_shift == ATA_SHIFT_PIO)
1751 dev->flags |= ATA_DFLAG_PIO;
1753 ata_dev_set_xfermode(ap, dev);
1755 if (ata_dev_revalidate(ap, dev, 0)) {
1756 printk(KERN_ERR "ata%u: failed to revalidate after set "
1757 "xfermode, disabled\n", ap->id);
1758 ata_port_disable(ap);
1761 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1762 dev->xfer_shift, (int)dev->xfer_mode);
1764 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1766 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1769 static int ata_host_set_pio(struct ata_port *ap)
1773 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1774 struct ata_device *dev = &ap->device[i];
1776 if (!ata_dev_present(dev))
1779 if (!dev->pio_mode) {
1780 printk(KERN_WARNING "ata%u: no PIO support for device %d.\n", ap->id, i);
1784 dev->xfer_mode = dev->pio_mode;
1785 dev->xfer_shift = ATA_SHIFT_PIO;
1786 if (ap->ops->set_piomode)
1787 ap->ops->set_piomode(ap, dev);
1793 static void ata_host_set_dma(struct ata_port *ap)
1797 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1798 struct ata_device *dev = &ap->device[i];
1800 if (!ata_dev_present(dev) || !dev->dma_mode)
1803 dev->xfer_mode = dev->dma_mode;
1804 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
1805 if (ap->ops->set_dmamode)
1806 ap->ops->set_dmamode(ap, dev);
1811 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1812 * @ap: port on which timings will be programmed
1814 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1817 * PCI/etc. bus probe sem.
1819 static void ata_set_mode(struct ata_port *ap)
1823 /* step 1: calculate xfer_mask */
1824 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1825 struct ata_device *dev = &ap->device[i];
1826 unsigned int pio_mask, dma_mask;
1828 if (!ata_dev_present(dev))
1831 ata_dev_xfermask(ap, dev);
1833 /* TODO: let LLDD filter dev->*_mask here */
1835 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
1836 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
1837 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
1838 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
1841 /* step 2: always set host PIO timings */
1842 rc = ata_host_set_pio(ap);
1846 /* step 3: set host DMA timings */
1847 ata_host_set_dma(ap);
1849 /* step 4: update devices' xfer mode */
1850 for (i = 0; i < ATA_MAX_DEVICES; i++)
1851 ata_dev_set_mode(ap, &ap->device[i]);
1853 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1856 if (ap->ops->post_set_mode)
1857 ap->ops->post_set_mode(ap);
1862 ata_port_disable(ap);
1866 * ata_tf_to_host - issue ATA taskfile to host controller
1867 * @ap: port to which command is being issued
1868 * @tf: ATA taskfile register set
1870 * Issues ATA taskfile register set to ATA host controller,
1871 * with proper synchronization with interrupt handler and
1875 * spin_lock_irqsave(host_set lock)
1878 static inline void ata_tf_to_host(struct ata_port *ap,
1879 const struct ata_taskfile *tf)
1881 ap->ops->tf_load(ap, tf);
1882 ap->ops->exec_command(ap, tf);
1886 * ata_busy_sleep - sleep until BSY clears, or timeout
1887 * @ap: port containing status register to be polled
1888 * @tmout_pat: impatience timeout
1889 * @tmout: overall timeout
1891 * Sleep until ATA Status register bit BSY clears,
1892 * or a timeout occurs.
1897 unsigned int ata_busy_sleep (struct ata_port *ap,
1898 unsigned long tmout_pat, unsigned long tmout)
1900 unsigned long timer_start, timeout;
1903 status = ata_busy_wait(ap, ATA_BUSY, 300);
1904 timer_start = jiffies;
1905 timeout = timer_start + tmout_pat;
1906 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1908 status = ata_busy_wait(ap, ATA_BUSY, 3);
1911 if (status & ATA_BUSY)
1912 printk(KERN_WARNING "ata%u is slow to respond, "
1913 "please be patient\n", ap->id);
1915 timeout = timer_start + tmout;
1916 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1918 status = ata_chk_status(ap);
1921 if (status & ATA_BUSY) {
1922 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1923 ap->id, tmout / HZ);
1930 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1932 struct ata_ioports *ioaddr = &ap->ioaddr;
1933 unsigned int dev0 = devmask & (1 << 0);
1934 unsigned int dev1 = devmask & (1 << 1);
1935 unsigned long timeout;
1937 /* if device 0 was found in ata_devchk, wait for its
1941 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1943 /* if device 1 was found in ata_devchk, wait for
1944 * register access, then wait for BSY to clear
1946 timeout = jiffies + ATA_TMOUT_BOOT;
1950 ap->ops->dev_select(ap, 1);
1951 if (ap->flags & ATA_FLAG_MMIO) {
1952 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1953 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1955 nsect = inb(ioaddr->nsect_addr);
1956 lbal = inb(ioaddr->lbal_addr);
1958 if ((nsect == 1) && (lbal == 1))
1960 if (time_after(jiffies, timeout)) {
1964 msleep(50); /* give drive a breather */
1967 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1969 /* is all this really necessary? */
1970 ap->ops->dev_select(ap, 0);
1972 ap->ops->dev_select(ap, 1);
1974 ap->ops->dev_select(ap, 0);
1978 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1979 * @ap: Port to reset and probe
1981 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1982 * probe the bus. Not often used these days.
1985 * PCI/etc. bus probe sem.
1986 * Obtains host_set lock.
1990 static unsigned int ata_bus_edd(struct ata_port *ap)
1992 struct ata_taskfile tf;
1993 unsigned long flags;
1995 /* set up execute-device-diag (bus reset) taskfile */
1996 /* also, take interrupts to a known state (disabled) */
1997 DPRINTK("execute-device-diag\n");
1998 ata_tf_init(ap, &tf, 0);
2000 tf.command = ATA_CMD_EDD;
2001 tf.protocol = ATA_PROT_NODATA;
2004 spin_lock_irqsave(&ap->host_set->lock, flags);
2005 ata_tf_to_host(ap, &tf);
2006 spin_unlock_irqrestore(&ap->host_set->lock, flags);
2008 /* spec says at least 2ms. but who knows with those
2009 * crazy ATAPI devices...
2013 return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2016 static unsigned int ata_bus_softreset(struct ata_port *ap,
2017 unsigned int devmask)
2019 struct ata_ioports *ioaddr = &ap->ioaddr;
2021 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2023 /* software reset. causes dev0 to be selected */
2024 if (ap->flags & ATA_FLAG_MMIO) {
2025 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2026 udelay(20); /* FIXME: flush */
2027 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2028 udelay(20); /* FIXME: flush */
2029 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2031 outb(ap->ctl, ioaddr->ctl_addr);
2033 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2035 outb(ap->ctl, ioaddr->ctl_addr);
2038 /* spec mandates ">= 2ms" before checking status.
2039 * We wait 150ms, because that was the magic delay used for
2040 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2041 * between when the ATA command register is written, and then
2042 * status is checked. Because waiting for "a while" before
2043 * checking status is fine, post SRST, we perform this magic
2044 * delay here as well.
2046 * Old drivers/ide uses the 2mS rule and then waits for ready
2051 /* Before we perform post reset processing we want to see if
2052 the bus shows 0xFF because the odd clown forgets the D7 pulldown
2055 if (ata_check_status(ap) == 0xFF)
2056 return 1; /* Positive is failure for some reason */
2058 ata_bus_post_reset(ap, devmask);
2064 * ata_bus_reset - reset host port and associated ATA channel
2065 * @ap: port to reset
2067 * This is typically the first time we actually start issuing
2068 * commands to the ATA channel. We wait for BSY to clear, then
2069 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2070 * result. Determine what devices, if any, are on the channel
2071 * by looking at the device 0/1 error register. Look at the signature
2072 * stored in each device's taskfile registers, to determine if
2073 * the device is ATA or ATAPI.
2076 * PCI/etc. bus probe sem.
2077 * Obtains host_set lock.
2080 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2083 void ata_bus_reset(struct ata_port *ap)
2085 struct ata_ioports *ioaddr = &ap->ioaddr;
2086 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2088 unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
2090 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2092 /* determine if device 0/1 are present */
2093 if (ap->flags & ATA_FLAG_SATA_RESET)
2096 dev0 = ata_devchk(ap, 0);
2098 dev1 = ata_devchk(ap, 1);
2102 devmask |= (1 << 0);
2104 devmask |= (1 << 1);
2106 /* select device 0 again */
2107 ap->ops->dev_select(ap, 0);
2109 /* issue bus reset */
2110 if (ap->flags & ATA_FLAG_SRST)
2111 rc = ata_bus_softreset(ap, devmask);
2112 else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
2113 /* set up device control */
2114 if (ap->flags & ATA_FLAG_MMIO)
2115 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2117 outb(ap->ctl, ioaddr->ctl_addr);
2118 rc = ata_bus_edd(ap);
2125 * determine by signature whether we have ATA or ATAPI devices
2127 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2128 if ((slave_possible) && (err != 0x81))
2129 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2131 /* re-enable interrupts */
2132 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2135 /* is double-select really necessary? */
2136 if (ap->device[1].class != ATA_DEV_NONE)
2137 ap->ops->dev_select(ap, 1);
2138 if (ap->device[0].class != ATA_DEV_NONE)
2139 ap->ops->dev_select(ap, 0);
2141 /* if no devices were detected, disable this port */
2142 if ((ap->device[0].class == ATA_DEV_NONE) &&
2143 (ap->device[1].class == ATA_DEV_NONE))
2146 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2147 /* set up device control for ATA_FLAG_SATA_RESET */
2148 if (ap->flags & ATA_FLAG_MMIO)
2149 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2151 outb(ap->ctl, ioaddr->ctl_addr);
2158 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2159 ap->ops->port_disable(ap);
2164 static int sata_phy_resume(struct ata_port *ap)
2166 unsigned long timeout = jiffies + (HZ * 5);
2169 scr_write_flush(ap, SCR_CONTROL, 0x300);
2171 /* Wait for phy to become ready, if necessary. */
2174 sstatus = scr_read(ap, SCR_STATUS);
2175 if ((sstatus & 0xf) != 1)
2177 } while (time_before(jiffies, timeout));
2183 * ata_std_probeinit - initialize probing
2184 * @ap: port to be probed
2186 * @ap is about to be probed. Initialize it. This function is
2187 * to be used as standard callback for ata_drive_probe_reset().
2189 * NOTE!!! Do not use this function as probeinit if a low level
2190 * driver implements only hardreset. Just pass NULL as probeinit
2191 * in that case. Using this function is probably okay but doing
2192 * so makes reset sequence different from the original
2193 * ->phy_reset implementation and Jeff nervous. :-P
2195 extern void ata_std_probeinit(struct ata_port *ap)
2197 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
2198 sata_phy_resume(ap);
2199 if (sata_dev_present(ap))
2200 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2205 * ata_std_softreset - reset host port via ATA SRST
2206 * @ap: port to reset
2207 * @verbose: fail verbosely
2208 * @classes: resulting classes of attached devices
2210 * Reset host port using ATA SRST. This function is to be used
2211 * as standard callback for ata_drive_*_reset() functions.
2214 * Kernel thread context (may sleep)
2217 * 0 on success, -errno otherwise.
2219 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2221 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2222 unsigned int devmask = 0, err_mask;
2227 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2228 classes[0] = ATA_DEV_NONE;
2232 /* determine if device 0/1 are present */
2233 if (ata_devchk(ap, 0))
2234 devmask |= (1 << 0);
2235 if (slave_possible && ata_devchk(ap, 1))
2236 devmask |= (1 << 1);
2238 /* select device 0 again */
2239 ap->ops->dev_select(ap, 0);
2241 /* issue bus reset */
2242 DPRINTK("about to softreset, devmask=%x\n", devmask);
2243 err_mask = ata_bus_softreset(ap, devmask);
2246 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2249 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2254 /* determine by signature whether we have ATA or ATAPI devices */
2255 classes[0] = ata_dev_try_classify(ap, 0, &err);
2256 if (slave_possible && err != 0x81)
2257 classes[1] = ata_dev_try_classify(ap, 1, &err);
2260 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2265 * sata_std_hardreset - reset host port via SATA phy reset
2266 * @ap: port to reset
2267 * @verbose: fail verbosely
2268 * @class: resulting class of attached device
2270 * SATA phy-reset host port using DET bits of SControl register.
2271 * This function is to be used as standard callback for
2272 * ata_drive_*_reset().
2275 * Kernel thread context (may sleep)
2278 * 0 on success, -errno otherwise.
2280 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2284 /* Issue phy wake/reset */
2285 scr_write_flush(ap, SCR_CONTROL, 0x301);
2288 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2289 * 10.4.2 says at least 1 ms.
2293 /* Bring phy back */
2294 sata_phy_resume(ap);
2296 /* TODO: phy layer with polling, timeouts, etc. */
2297 if (!sata_dev_present(ap)) {
2298 *class = ATA_DEV_NONE;
2299 DPRINTK("EXIT, link offline\n");
2303 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2305 printk(KERN_ERR "ata%u: COMRESET failed "
2306 "(device not ready)\n", ap->id);
2308 DPRINTK("EXIT, device not ready\n");
2312 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2314 *class = ata_dev_try_classify(ap, 0, NULL);
2316 DPRINTK("EXIT, class=%u\n", *class);
2321 * ata_std_postreset - standard postreset callback
2322 * @ap: the target ata_port
2323 * @classes: classes of attached devices
2325 * This function is invoked after a successful reset. Note that
2326 * the device might have been reset more than once using
2327 * different reset methods before postreset is invoked.
2329 * This function is to be used as standard callback for
2330 * ata_drive_*_reset().
2333 * Kernel thread context (may sleep)
2335 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2339 /* set cable type if it isn't already set */
2340 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2341 ap->cbl = ATA_CBL_SATA;
2343 /* print link status */
2344 if (ap->cbl == ATA_CBL_SATA)
2345 sata_print_link_status(ap);
2347 /* re-enable interrupts */
2348 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2351 /* is double-select really necessary? */
2352 if (classes[0] != ATA_DEV_NONE)
2353 ap->ops->dev_select(ap, 1);
2354 if (classes[1] != ATA_DEV_NONE)
2355 ap->ops->dev_select(ap, 0);
2357 /* bail out if no device is present */
2358 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2359 DPRINTK("EXIT, no device\n");
2363 /* set up device control */
2364 if (ap->ioaddr.ctl_addr) {
2365 if (ap->flags & ATA_FLAG_MMIO)
2366 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2368 outb(ap->ctl, ap->ioaddr.ctl_addr);
2375 * ata_std_probe_reset - standard probe reset method
2376 * @ap: prot to perform probe-reset
2377 * @classes: resulting classes of attached devices
2379 * The stock off-the-shelf ->probe_reset method.
2382 * Kernel thread context (may sleep)
2385 * 0 on success, -errno otherwise.
2387 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2389 ata_reset_fn_t hardreset;
2392 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2393 hardreset = sata_std_hardreset;
2395 return ata_drive_probe_reset(ap, ata_std_probeinit,
2396 ata_std_softreset, hardreset,
2397 ata_std_postreset, classes);
2400 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2401 ata_postreset_fn_t postreset,
2402 unsigned int *classes)
2406 for (i = 0; i < ATA_MAX_DEVICES; i++)
2407 classes[i] = ATA_DEV_UNKNOWN;
2409 rc = reset(ap, 0, classes);
2413 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2414 * is complete and convert all ATA_DEV_UNKNOWN to
2417 for (i = 0; i < ATA_MAX_DEVICES; i++)
2418 if (classes[i] != ATA_DEV_UNKNOWN)
2421 if (i < ATA_MAX_DEVICES)
2422 for (i = 0; i < ATA_MAX_DEVICES; i++)
2423 if (classes[i] == ATA_DEV_UNKNOWN)
2424 classes[i] = ATA_DEV_NONE;
2427 postreset(ap, classes);
2429 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2433 * ata_drive_probe_reset - Perform probe reset with given methods
2434 * @ap: port to reset
2435 * @probeinit: probeinit method (can be NULL)
2436 * @softreset: softreset method (can be NULL)
2437 * @hardreset: hardreset method (can be NULL)
2438 * @postreset: postreset method (can be NULL)
2439 * @classes: resulting classes of attached devices
2441 * Reset the specified port and classify attached devices using
2442 * given methods. This function prefers softreset but tries all
2443 * possible reset sequences to reset and classify devices. This
2444 * function is intended to be used for constructing ->probe_reset
2445 * callback by low level drivers.
2447 * Reset methods should follow the following rules.
2449 * - Return 0 on sucess, -errno on failure.
2450 * - If classification is supported, fill classes[] with
2451 * recognized class codes.
2452 * - If classification is not supported, leave classes[] alone.
2453 * - If verbose is non-zero, print error message on failure;
2454 * otherwise, shut up.
2457 * Kernel thread context (may sleep)
2460 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2461 * if classification fails, and any error code from reset
2464 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2465 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2466 ata_postreset_fn_t postreset, unsigned int *classes)
2474 rc = do_probe_reset(ap, softreset, postreset, classes);
2482 rc = do_probe_reset(ap, hardreset, postreset, classes);
2483 if (rc == 0 || rc != -ENODEV)
2487 rc = do_probe_reset(ap, softreset, postreset, classes);
2493 * ata_dev_same_device - Determine whether new ID matches configured device
2494 * @ap: port on which the device to compare against resides
2495 * @dev: device to compare against
2496 * @new_class: class of the new device
2497 * @new_id: IDENTIFY page of the new device
2499 * Compare @new_class and @new_id against @dev and determine
2500 * whether @dev is the device indicated by @new_class and
2507 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2509 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2510 unsigned int new_class, const u16 *new_id)
2512 const u16 *old_id = dev->id;
2513 unsigned char model[2][41], serial[2][21];
2516 if (dev->class != new_class) {
2518 "ata%u: dev %u class mismatch %d != %d\n",
2519 ap->id, dev->devno, dev->class, new_class);
2523 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2524 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2525 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2526 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2527 new_n_sectors = ata_id_n_sectors(new_id);
2529 if (strcmp(model[0], model[1])) {
2531 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2532 ap->id, dev->devno, model[0], model[1]);
2536 if (strcmp(serial[0], serial[1])) {
2538 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2539 ap->id, dev->devno, serial[0], serial[1]);
2543 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2545 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2546 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2547 (unsigned long long)new_n_sectors);
2555 * ata_dev_revalidate - Revalidate ATA device
2556 * @ap: port on which the device to revalidate resides
2557 * @dev: device to revalidate
2558 * @post_reset: is this revalidation after reset?
2560 * Re-read IDENTIFY page and make sure @dev is still attached to
2564 * Kernel thread context (may sleep)
2567 * 0 on success, negative errno otherwise
2569 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2576 if (!ata_dev_present(dev))
2582 /* allocate & read ID data */
2583 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2587 /* is the device still there? */
2588 if (!ata_dev_same_device(ap, dev, class, id)) {
2596 /* configure device according to the new ID */
2597 return ata_dev_configure(ap, dev, 0);
2600 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2601 ap->id, dev->devno, rc);
2606 static const char * const ata_dma_blacklist [] = {
2607 "WDC AC11000H", NULL,
2608 "WDC AC22100H", NULL,
2609 "WDC AC32500H", NULL,
2610 "WDC AC33100H", NULL,
2611 "WDC AC31600H", NULL,
2612 "WDC AC32100H", "24.09P07",
2613 "WDC AC23200L", "21.10N21",
2614 "Compaq CRD-8241B", NULL,
2619 "SanDisk SDP3B", NULL,
2620 "SanDisk SDP3B-64", NULL,
2621 "SANYO CD-ROM CRD", NULL,
2622 "HITACHI CDR-8", NULL,
2623 "HITACHI CDR-8335", NULL,
2624 "HITACHI CDR-8435", NULL,
2625 "Toshiba CD-ROM XM-6202B", NULL,
2626 "TOSHIBA CD-ROM XM-1702BC", NULL,
2628 "E-IDE CD-ROM CR-840", NULL,
2629 "CD-ROM Drive/F5A", NULL,
2630 "WPI CDD-820", NULL,
2631 "SAMSUNG CD-ROM SC-148C", NULL,
2632 "SAMSUNG CD-ROM SC", NULL,
2633 "SanDisk SDP3B-64", NULL,
2634 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2635 "_NEC DV5800A", NULL,
2636 "SAMSUNG CD-ROM SN-124", "N001"
2639 static int ata_strim(char *s, size_t len)
2641 len = strnlen(s, len);
2643 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2644 while ((len > 0) && (s[len - 1] == ' ')) {
2651 static int ata_dma_blacklisted(const struct ata_device *dev)
2653 unsigned char model_num[40];
2654 unsigned char model_rev[16];
2655 unsigned int nlen, rlen;
2658 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2660 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2662 nlen = ata_strim(model_num, sizeof(model_num));
2663 rlen = ata_strim(model_rev, sizeof(model_rev));
2665 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2666 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2667 if (ata_dma_blacklist[i+1] == NULL)
2669 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2677 * ata_dev_xfermask - Compute supported xfermask of the given device
2678 * @ap: Port on which the device to compute xfermask for resides
2679 * @dev: Device to compute xfermask for
2681 * Compute supported xfermask of @dev and store it in
2682 * dev->*_mask. This function is responsible for applying all
2683 * known limits including host controller limits, device
2689 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
2691 unsigned long xfer_mask;
2694 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
2697 /* use port-wide xfermask for now */
2698 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2699 struct ata_device *d = &ap->device[i];
2700 if (!ata_dev_present(d))
2702 xfer_mask &= ata_pack_xfermask(d->pio_mask, d->mwdma_mask,
2704 xfer_mask &= ata_id_xfermask(d->id);
2705 if (ata_dma_blacklisted(d))
2706 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2709 if (ata_dma_blacklisted(dev))
2710 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2711 "disabling DMA\n", ap->id, dev->devno);
2713 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2718 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2719 * @ap: Port associated with device @dev
2720 * @dev: Device to which command will be sent
2722 * Issue SET FEATURES - XFER MODE command to device @dev
2726 * PCI/etc. bus probe sem.
2729 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
2731 struct ata_taskfile tf;
2733 /* set up set-features taskfile */
2734 DPRINTK("set features - xfer mode\n");
2736 ata_tf_init(ap, &tf, dev->devno);
2737 tf.command = ATA_CMD_SET_FEATURES;
2738 tf.feature = SETFEATURES_XFER;
2739 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2740 tf.protocol = ATA_PROT_NODATA;
2741 tf.nsect = dev->xfer_mode;
2743 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2744 printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
2746 ata_port_disable(ap);
2753 * ata_dev_init_params - Issue INIT DEV PARAMS command
2754 * @ap: Port associated with device @dev
2755 * @dev: Device to which command will be sent
2758 * Kernel thread context (may sleep)
2761 * 0 on success, AC_ERR_* mask otherwise.
2764 static unsigned int ata_dev_init_params(struct ata_port *ap,
2765 struct ata_device *dev)
2767 struct ata_taskfile tf;
2768 unsigned int err_mask;
2769 u16 sectors = dev->id[6];
2770 u16 heads = dev->id[3];
2772 /* Number of sectors per track 1-255. Number of heads 1-16 */
2773 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2776 /* set up init dev params taskfile */
2777 DPRINTK("init dev params \n");
2779 ata_tf_init(ap, &tf, dev->devno);
2780 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2781 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2782 tf.protocol = ATA_PROT_NODATA;
2784 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2786 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2788 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2793 * ata_sg_clean - Unmap DMA memory associated with command
2794 * @qc: Command containing DMA memory to be released
2796 * Unmap all mapped DMA memory associated with this command.
2799 * spin_lock_irqsave(host_set lock)
2802 static void ata_sg_clean(struct ata_queued_cmd *qc)
2804 struct ata_port *ap = qc->ap;
2805 struct scatterlist *sg = qc->__sg;
2806 int dir = qc->dma_dir;
2807 void *pad_buf = NULL;
2809 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2810 WARN_ON(sg == NULL);
2812 if (qc->flags & ATA_QCFLAG_SINGLE)
2813 WARN_ON(qc->n_elem > 1);
2815 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2817 /* if we padded the buffer out to 32-bit bound, and data
2818 * xfer direction is from-device, we must copy from the
2819 * pad buffer back into the supplied buffer
2821 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2822 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2824 if (qc->flags & ATA_QCFLAG_SG) {
2826 dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
2827 /* restore last sg */
2828 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2830 struct scatterlist *psg = &qc->pad_sgent;
2831 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2832 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2833 kunmap_atomic(addr, KM_IRQ0);
2837 dma_unmap_single(ap->host_set->dev,
2838 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2841 sg->length += qc->pad_len;
2843 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2844 pad_buf, qc->pad_len);
2847 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2852 * ata_fill_sg - Fill PCI IDE PRD table
2853 * @qc: Metadata associated with taskfile to be transferred
2855 * Fill PCI IDE PRD (scatter-gather) table with segments
2856 * associated with the current disk command.
2859 * spin_lock_irqsave(host_set lock)
2862 static void ata_fill_sg(struct ata_queued_cmd *qc)
2864 struct ata_port *ap = qc->ap;
2865 struct scatterlist *sg;
2868 WARN_ON(qc->__sg == NULL);
2869 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2872 ata_for_each_sg(sg, qc) {
2876 /* determine if physical DMA addr spans 64K boundary.
2877 * Note h/w doesn't support 64-bit, so we unconditionally
2878 * truncate dma_addr_t to u32.
2880 addr = (u32) sg_dma_address(sg);
2881 sg_len = sg_dma_len(sg);
2884 offset = addr & 0xffff;
2886 if ((offset + sg_len) > 0x10000)
2887 len = 0x10000 - offset;
2889 ap->prd[idx].addr = cpu_to_le32(addr);
2890 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2891 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2900 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2903 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2904 * @qc: Metadata associated with taskfile to check
2906 * Allow low-level driver to filter ATA PACKET commands, returning
2907 * a status indicating whether or not it is OK to use DMA for the
2908 * supplied PACKET command.
2911 * spin_lock_irqsave(host_set lock)
2913 * RETURNS: 0 when ATAPI DMA can be used
2916 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2918 struct ata_port *ap = qc->ap;
2919 int rc = 0; /* Assume ATAPI DMA is OK by default */
2921 if (ap->ops->check_atapi_dma)
2922 rc = ap->ops->check_atapi_dma(qc);
2927 * ata_qc_prep - Prepare taskfile for submission
2928 * @qc: Metadata associated with taskfile to be prepared
2930 * Prepare ATA taskfile for submission.
2933 * spin_lock_irqsave(host_set lock)
2935 void ata_qc_prep(struct ata_queued_cmd *qc)
2937 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2943 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
2946 * ata_sg_init_one - Associate command with memory buffer
2947 * @qc: Command to be associated
2948 * @buf: Memory buffer
2949 * @buflen: Length of memory buffer, in bytes.
2951 * Initialize the data-related elements of queued_cmd @qc
2952 * to point to a single memory buffer, @buf of byte length @buflen.
2955 * spin_lock_irqsave(host_set lock)
2958 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2960 struct scatterlist *sg;
2962 qc->flags |= ATA_QCFLAG_SINGLE;
2964 memset(&qc->sgent, 0, sizeof(qc->sgent));
2965 qc->__sg = &qc->sgent;
2967 qc->orig_n_elem = 1;
2971 sg_init_one(sg, buf, buflen);
2975 * ata_sg_init - Associate command with scatter-gather table.
2976 * @qc: Command to be associated
2977 * @sg: Scatter-gather table.
2978 * @n_elem: Number of elements in s/g table.
2980 * Initialize the data-related elements of queued_cmd @qc
2981 * to point to a scatter-gather table @sg, containing @n_elem
2985 * spin_lock_irqsave(host_set lock)
2988 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2989 unsigned int n_elem)
2991 qc->flags |= ATA_QCFLAG_SG;
2993 qc->n_elem = n_elem;
2994 qc->orig_n_elem = n_elem;
2998 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2999 * @qc: Command with memory buffer to be mapped.
3001 * DMA-map the memory buffer associated with queued_cmd @qc.
3004 * spin_lock_irqsave(host_set lock)
3007 * Zero on success, negative on error.
3010 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3012 struct ata_port *ap = qc->ap;
3013 int dir = qc->dma_dir;
3014 struct scatterlist *sg = qc->__sg;
3015 dma_addr_t dma_address;
3018 /* we must lengthen transfers to end on a 32-bit boundary */
3019 qc->pad_len = sg->length & 3;
3021 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3022 struct scatterlist *psg = &qc->pad_sgent;
3024 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3026 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3028 if (qc->tf.flags & ATA_TFLAG_WRITE)
3029 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3032 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3033 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3035 sg->length -= qc->pad_len;
3036 if (sg->length == 0)
3039 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3040 sg->length, qc->pad_len);
3048 dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
3050 if (dma_mapping_error(dma_address)) {
3052 sg->length += qc->pad_len;
3056 sg_dma_address(sg) = dma_address;
3057 sg_dma_len(sg) = sg->length;
3060 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3061 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3067 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3068 * @qc: Command with scatter-gather table to be mapped.
3070 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3073 * spin_lock_irqsave(host_set lock)
3076 * Zero on success, negative on error.
3080 static int ata_sg_setup(struct ata_queued_cmd *qc)
3082 struct ata_port *ap = qc->ap;
3083 struct scatterlist *sg = qc->__sg;
3084 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3085 int n_elem, pre_n_elem, dir, trim_sg = 0;
3087 VPRINTK("ENTER, ata%u\n", ap->id);
3088 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3090 /* we must lengthen transfers to end on a 32-bit boundary */
3091 qc->pad_len = lsg->length & 3;
3093 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3094 struct scatterlist *psg = &qc->pad_sgent;
3095 unsigned int offset;
3097 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3099 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3102 * psg->page/offset are used to copy to-be-written
3103 * data in this function or read data in ata_sg_clean.
3105 offset = lsg->offset + lsg->length - qc->pad_len;
3106 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3107 psg->offset = offset_in_page(offset);
3109 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3110 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3111 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3112 kunmap_atomic(addr, KM_IRQ0);
3115 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3116 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3118 lsg->length -= qc->pad_len;
3119 if (lsg->length == 0)
3122 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3123 qc->n_elem - 1, lsg->length, qc->pad_len);
3126 pre_n_elem = qc->n_elem;
3127 if (trim_sg && pre_n_elem)
3136 n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
3138 /* restore last sg */
3139 lsg->length += qc->pad_len;
3143 DPRINTK("%d sg elements mapped\n", n_elem);
3146 qc->n_elem = n_elem;
3152 * ata_poll_qc_complete - turn irq back on and finish qc
3153 * @qc: Command to complete
3154 * @err_mask: ATA status register content
3157 * None. (grabs host lock)
3160 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3162 struct ata_port *ap = qc->ap;
3163 unsigned long flags;
3165 spin_lock_irqsave(&ap->host_set->lock, flags);
3166 ap->flags &= ~ATA_FLAG_NOINTR;
3168 ata_qc_complete(qc);
3169 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3173 * ata_pio_poll - poll using PIO, depending on current state
3174 * @ap: the target ata_port
3177 * None. (executing in kernel thread context)
3180 * timeout value to use
3183 static unsigned long ata_pio_poll(struct ata_port *ap)
3185 struct ata_queued_cmd *qc;
3187 unsigned int poll_state = HSM_ST_UNKNOWN;
3188 unsigned int reg_state = HSM_ST_UNKNOWN;
3190 qc = ata_qc_from_tag(ap, ap->active_tag);
3191 WARN_ON(qc == NULL);
3193 switch (ap->hsm_task_state) {
3196 poll_state = HSM_ST_POLL;
3200 case HSM_ST_LAST_POLL:
3201 poll_state = HSM_ST_LAST_POLL;
3202 reg_state = HSM_ST_LAST;
3209 status = ata_chk_status(ap);
3210 if (status & ATA_BUSY) {
3211 if (time_after(jiffies, ap->pio_task_timeout)) {
3212 qc->err_mask |= AC_ERR_TIMEOUT;
3213 ap->hsm_task_state = HSM_ST_TMOUT;
3216 ap->hsm_task_state = poll_state;
3217 return ATA_SHORT_PAUSE;
3220 ap->hsm_task_state = reg_state;
3225 * ata_pio_complete - check if drive is busy or idle
3226 * @ap: the target ata_port
3229 * None. (executing in kernel thread context)
3232 * Non-zero if qc completed, zero otherwise.
3235 static int ata_pio_complete (struct ata_port *ap)
3237 struct ata_queued_cmd *qc;
3241 * This is purely heuristic. This is a fast path. Sometimes when
3242 * we enter, BSY will be cleared in a chk-status or two. If not,
3243 * the drive is probably seeking or something. Snooze for a couple
3244 * msecs, then chk-status again. If still busy, fall back to
3245 * HSM_ST_POLL state.
3247 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3248 if (drv_stat & ATA_BUSY) {
3250 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3251 if (drv_stat & ATA_BUSY) {
3252 ap->hsm_task_state = HSM_ST_LAST_POLL;
3253 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3258 qc = ata_qc_from_tag(ap, ap->active_tag);
3259 WARN_ON(qc == NULL);
3261 drv_stat = ata_wait_idle(ap);
3262 if (!ata_ok(drv_stat)) {
3263 qc->err_mask |= __ac_err_mask(drv_stat);
3264 ap->hsm_task_state = HSM_ST_ERR;
3268 ap->hsm_task_state = HSM_ST_IDLE;
3270 WARN_ON(qc->err_mask);
3271 ata_poll_qc_complete(qc);
3273 /* another command may start at this point */
3280 * swap_buf_le16 - swap halves of 16-bit words in place
3281 * @buf: Buffer to swap
3282 * @buf_words: Number of 16-bit words in buffer.
3284 * Swap halves of 16-bit words if needed to convert from
3285 * little-endian byte order to native cpu byte order, or
3289 * Inherited from caller.
3291 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3296 for (i = 0; i < buf_words; i++)
3297 buf[i] = le16_to_cpu(buf[i]);
3298 #endif /* __BIG_ENDIAN */
3302 * ata_mmio_data_xfer - Transfer data by MMIO
3303 * @ap: port to read/write
3305 * @buflen: buffer length
3306 * @write_data: read/write
3308 * Transfer data from/to the device data register by MMIO.
3311 * Inherited from caller.
3314 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3315 unsigned int buflen, int write_data)
3318 unsigned int words = buflen >> 1;
3319 u16 *buf16 = (u16 *) buf;
3320 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3322 /* Transfer multiple of 2 bytes */
3324 for (i = 0; i < words; i++)
3325 writew(le16_to_cpu(buf16[i]), mmio);
3327 for (i = 0; i < words; i++)
3328 buf16[i] = cpu_to_le16(readw(mmio));
3331 /* Transfer trailing 1 byte, if any. */
3332 if (unlikely(buflen & 0x01)) {
3333 u16 align_buf[1] = { 0 };
3334 unsigned char *trailing_buf = buf + buflen - 1;
3337 memcpy(align_buf, trailing_buf, 1);
3338 writew(le16_to_cpu(align_buf[0]), mmio);
3340 align_buf[0] = cpu_to_le16(readw(mmio));
3341 memcpy(trailing_buf, align_buf, 1);
3347 * ata_pio_data_xfer - Transfer data by PIO
3348 * @ap: port to read/write
3350 * @buflen: buffer length
3351 * @write_data: read/write
3353 * Transfer data from/to the device data register by PIO.
3356 * Inherited from caller.
3359 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3360 unsigned int buflen, int write_data)
3362 unsigned int words = buflen >> 1;
3364 /* Transfer multiple of 2 bytes */
3366 outsw(ap->ioaddr.data_addr, buf, words);
3368 insw(ap->ioaddr.data_addr, buf, words);
3370 /* Transfer trailing 1 byte, if any. */
3371 if (unlikely(buflen & 0x01)) {
3372 u16 align_buf[1] = { 0 };
3373 unsigned char *trailing_buf = buf + buflen - 1;
3376 memcpy(align_buf, trailing_buf, 1);
3377 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3379 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3380 memcpy(trailing_buf, align_buf, 1);
3386 * ata_data_xfer - Transfer data from/to the data register.
3387 * @ap: port to read/write
3389 * @buflen: buffer length
3390 * @do_write: read/write
3392 * Transfer data from/to the device data register.
3395 * Inherited from caller.
3398 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3399 unsigned int buflen, int do_write)
3401 /* Make the crap hardware pay the costs not the good stuff */
3402 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3403 unsigned long flags;
3404 local_irq_save(flags);
3405 if (ap->flags & ATA_FLAG_MMIO)
3406 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3408 ata_pio_data_xfer(ap, buf, buflen, do_write);
3409 local_irq_restore(flags);
3411 if (ap->flags & ATA_FLAG_MMIO)
3412 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3414 ata_pio_data_xfer(ap, buf, buflen, do_write);
3419 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3420 * @qc: Command on going
3422 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3425 * Inherited from caller.
3428 static void ata_pio_sector(struct ata_queued_cmd *qc)
3430 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3431 struct scatterlist *sg = qc->__sg;
3432 struct ata_port *ap = qc->ap;
3434 unsigned int offset;
3437 if (qc->cursect == (qc->nsect - 1))
3438 ap->hsm_task_state = HSM_ST_LAST;
3440 page = sg[qc->cursg].page;
3441 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3443 /* get the current page and offset */
3444 page = nth_page(page, (offset >> PAGE_SHIFT));
3445 offset %= PAGE_SIZE;
3447 buf = kmap(page) + offset;
3452 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3457 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3459 /* do the actual data transfer */
3460 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3461 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3467 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3468 * @qc: Command on going
3469 * @bytes: number of bytes
3471 * Transfer Transfer data from/to the ATAPI device.
3474 * Inherited from caller.
3478 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3480 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3481 struct scatterlist *sg = qc->__sg;
3482 struct ata_port *ap = qc->ap;
3485 unsigned int offset, count;
3487 if (qc->curbytes + bytes >= qc->nbytes)
3488 ap->hsm_task_state = HSM_ST_LAST;
3491 if (unlikely(qc->cursg >= qc->n_elem)) {
3493 * The end of qc->sg is reached and the device expects
3494 * more data to transfer. In order not to overrun qc->sg
3495 * and fulfill length specified in the byte count register,
3496 * - for read case, discard trailing data from the device
3497 * - for write case, padding zero data to the device
3499 u16 pad_buf[1] = { 0 };
3500 unsigned int words = bytes >> 1;
3503 if (words) /* warning if bytes > 1 */
3504 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3507 for (i = 0; i < words; i++)
3508 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3510 ap->hsm_task_state = HSM_ST_LAST;
3514 sg = &qc->__sg[qc->cursg];
3517 offset = sg->offset + qc->cursg_ofs;
3519 /* get the current page and offset */
3520 page = nth_page(page, (offset >> PAGE_SHIFT));
3521 offset %= PAGE_SIZE;
3523 /* don't overrun current sg */
3524 count = min(sg->length - qc->cursg_ofs, bytes);
3526 /* don't cross page boundaries */
3527 count = min(count, (unsigned int)PAGE_SIZE - offset);
3529 buf = kmap(page) + offset;
3532 qc->curbytes += count;
3533 qc->cursg_ofs += count;
3535 if (qc->cursg_ofs == sg->length) {
3540 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3542 /* do the actual data transfer */
3543 ata_data_xfer(ap, buf, count, do_write);
3552 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3553 * @qc: Command on going
3555 * Transfer Transfer data from/to the ATAPI device.
3558 * Inherited from caller.
3561 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3563 struct ata_port *ap = qc->ap;
3564 struct ata_device *dev = qc->dev;
3565 unsigned int ireason, bc_lo, bc_hi, bytes;
3566 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3568 ap->ops->tf_read(ap, &qc->tf);
3569 ireason = qc->tf.nsect;
3570 bc_lo = qc->tf.lbam;
3571 bc_hi = qc->tf.lbah;
3572 bytes = (bc_hi << 8) | bc_lo;
3574 /* shall be cleared to zero, indicating xfer of data */
3575 if (ireason & (1 << 0))
3578 /* make sure transfer direction matches expected */
3579 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3580 if (do_write != i_write)
3583 __atapi_pio_bytes(qc, bytes);
3588 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3589 ap->id, dev->devno);
3590 qc->err_mask |= AC_ERR_HSM;
3591 ap->hsm_task_state = HSM_ST_ERR;
3595 * ata_pio_block - start PIO on a block
3596 * @ap: the target ata_port
3599 * None. (executing in kernel thread context)
3602 static void ata_pio_block(struct ata_port *ap)
3604 struct ata_queued_cmd *qc;
3608 * This is purely heuristic. This is a fast path.
3609 * Sometimes when we enter, BSY will be cleared in
3610 * a chk-status or two. If not, the drive is probably seeking
3611 * or something. Snooze for a couple msecs, then
3612 * chk-status again. If still busy, fall back to
3613 * HSM_ST_POLL state.
3615 status = ata_busy_wait(ap, ATA_BUSY, 5);
3616 if (status & ATA_BUSY) {
3618 status = ata_busy_wait(ap, ATA_BUSY, 10);
3619 if (status & ATA_BUSY) {
3620 ap->hsm_task_state = HSM_ST_POLL;
3621 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3626 qc = ata_qc_from_tag(ap, ap->active_tag);
3627 WARN_ON(qc == NULL);
3630 if (status & (ATA_ERR | ATA_DF)) {
3631 qc->err_mask |= AC_ERR_DEV;
3632 ap->hsm_task_state = HSM_ST_ERR;
3636 /* transfer data if any */
3637 if (is_atapi_taskfile(&qc->tf)) {
3638 /* DRQ=0 means no more data to transfer */
3639 if ((status & ATA_DRQ) == 0) {
3640 ap->hsm_task_state = HSM_ST_LAST;
3644 atapi_pio_bytes(qc);
3646 /* handle BSY=0, DRQ=0 as error */
3647 if ((status & ATA_DRQ) == 0) {
3648 qc->err_mask |= AC_ERR_HSM;
3649 ap->hsm_task_state = HSM_ST_ERR;
3657 static void ata_pio_error(struct ata_port *ap)
3659 struct ata_queued_cmd *qc;
3661 qc = ata_qc_from_tag(ap, ap->active_tag);
3662 WARN_ON(qc == NULL);
3664 if (qc->tf.command != ATA_CMD_PACKET)
3665 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3667 /* make sure qc->err_mask is available to
3668 * know what's wrong and recover
3670 WARN_ON(qc->err_mask == 0);
3672 ap->hsm_task_state = HSM_ST_IDLE;
3674 ata_poll_qc_complete(qc);
3677 static void ata_pio_task(void *_data)
3679 struct ata_port *ap = _data;
3680 unsigned long timeout;
3687 switch (ap->hsm_task_state) {
3696 qc_completed = ata_pio_complete(ap);
3700 case HSM_ST_LAST_POLL:
3701 timeout = ata_pio_poll(ap);
3711 ata_port_queue_task(ap, ata_pio_task, ap, timeout);
3712 else if (!qc_completed)
3717 * atapi_packet_task - Write CDB bytes to hardware
3718 * @_data: Port to which ATAPI device is attached.
3720 * When device has indicated its readiness to accept
3721 * a CDB, this function is called. Send the CDB.
3722 * If DMA is to be performed, exit immediately.
3723 * Otherwise, we are in polling mode, so poll
3724 * status under operation succeeds or fails.
3727 * Kernel thread context (may sleep)
3730 static void atapi_packet_task(void *_data)
3732 struct ata_port *ap = _data;
3733 struct ata_queued_cmd *qc;
3736 qc = ata_qc_from_tag(ap, ap->active_tag);
3737 WARN_ON(qc == NULL);
3738 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3740 /* sleep-wait for BSY to clear */
3741 DPRINTK("busy wait\n");
3742 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3743 qc->err_mask |= AC_ERR_TIMEOUT;
3747 /* make sure DRQ is set */
3748 status = ata_chk_status(ap);
3749 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3750 qc->err_mask |= AC_ERR_HSM;
3755 DPRINTK("send cdb\n");
3756 WARN_ON(qc->dev->cdb_len < 12);
3758 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3759 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3760 unsigned long flags;
3762 /* Once we're done issuing command and kicking bmdma,
3763 * irq handler takes over. To not lose irq, we need
3764 * to clear NOINTR flag before sending cdb, but
3765 * interrupt handler shouldn't be invoked before we're
3766 * finished. Hence, the following locking.
3768 spin_lock_irqsave(&ap->host_set->lock, flags);
3769 ap->flags &= ~ATA_FLAG_NOINTR;
3770 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3771 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3772 ap->ops->bmdma_start(qc); /* initiate bmdma */
3773 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3775 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3777 /* PIO commands are handled by polling */
3778 ap->hsm_task_state = HSM_ST;
3779 ata_port_queue_task(ap, ata_pio_task, ap, 0);
3785 ata_poll_qc_complete(qc);
3789 * ata_qc_timeout - Handle timeout of queued command
3790 * @qc: Command that timed out
3792 * Some part of the kernel (currently, only the SCSI layer)
3793 * has noticed that the active command on port @ap has not
3794 * completed after a specified length of time. Handle this
3795 * condition by disabling DMA (if necessary) and completing
3796 * transactions, with error if necessary.
3798 * This also handles the case of the "lost interrupt", where
3799 * for some reason (possibly hardware bug, possibly driver bug)
3800 * an interrupt was not delivered to the driver, even though the
3801 * transaction completed successfully.
3804 * Inherited from SCSI layer (none, can sleep)
3807 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3809 struct ata_port *ap = qc->ap;
3810 struct ata_host_set *host_set = ap->host_set;
3811 u8 host_stat = 0, drv_stat;
3812 unsigned long flags;
3816 ap->hsm_task_state = HSM_ST_IDLE;
3818 spin_lock_irqsave(&host_set->lock, flags);
3820 switch (qc->tf.protocol) {
3823 case ATA_PROT_ATAPI_DMA:
3824 host_stat = ap->ops->bmdma_status(ap);
3826 /* before we do anything else, clear DMA-Start bit */
3827 ap->ops->bmdma_stop(qc);
3833 drv_stat = ata_chk_status(ap);
3835 /* ack bmdma irq events */
3836 ap->ops->irq_clear(ap);
3838 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3839 ap->id, qc->tf.command, drv_stat, host_stat);
3841 /* complete taskfile transaction */
3842 qc->err_mask |= ac_err_mask(drv_stat);
3846 spin_unlock_irqrestore(&host_set->lock, flags);
3848 ata_eh_qc_complete(qc);
3854 * ata_eng_timeout - Handle timeout of queued command
3855 * @ap: Port on which timed-out command is active
3857 * Some part of the kernel (currently, only the SCSI layer)
3858 * has noticed that the active command on port @ap has not
3859 * completed after a specified length of time. Handle this
3860 * condition by disabling DMA (if necessary) and completing
3861 * transactions, with error if necessary.
3863 * This also handles the case of the "lost interrupt", where
3864 * for some reason (possibly hardware bug, possibly driver bug)
3865 * an interrupt was not delivered to the driver, even though the
3866 * transaction completed successfully.
3869 * Inherited from SCSI layer (none, can sleep)
3872 void ata_eng_timeout(struct ata_port *ap)
3876 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3882 * ata_qc_new - Request an available ATA command, for queueing
3883 * @ap: Port associated with device @dev
3884 * @dev: Device from whom we request an available command structure
3890 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3892 struct ata_queued_cmd *qc = NULL;
3895 for (i = 0; i < ATA_MAX_QUEUE; i++)
3896 if (!test_and_set_bit(i, &ap->qactive)) {
3897 qc = ata_qc_from_tag(ap, i);
3908 * ata_qc_new_init - Request an available ATA command, and initialize it
3909 * @ap: Port associated with device @dev
3910 * @dev: Device from whom we request an available command structure
3916 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3917 struct ata_device *dev)
3919 struct ata_queued_cmd *qc;
3921 qc = ata_qc_new(ap);
3934 * ata_qc_free - free unused ata_queued_cmd
3935 * @qc: Command to complete
3937 * Designed to free unused ata_queued_cmd object
3938 * in case something prevents using it.
3941 * spin_lock_irqsave(host_set lock)
3943 void ata_qc_free(struct ata_queued_cmd *qc)
3945 struct ata_port *ap = qc->ap;
3948 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3952 if (likely(ata_tag_valid(tag))) {
3953 if (tag == ap->active_tag)
3954 ap->active_tag = ATA_TAG_POISON;
3955 qc->tag = ATA_TAG_POISON;
3956 clear_bit(tag, &ap->qactive);
3960 void __ata_qc_complete(struct ata_queued_cmd *qc)
3962 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3963 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3965 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3968 /* atapi: mark qc as inactive to prevent the interrupt handler
3969 * from completing the command twice later, before the error handler
3970 * is called. (when rc != 0 and atapi request sense is needed)
3972 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3974 /* call completion callback */
3975 qc->complete_fn(qc);
3978 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3980 struct ata_port *ap = qc->ap;
3982 switch (qc->tf.protocol) {
3984 case ATA_PROT_ATAPI_DMA:
3987 case ATA_PROT_ATAPI:
3989 if (ap->flags & ATA_FLAG_PIO_DMA)
4002 * ata_qc_issue - issue taskfile to device
4003 * @qc: command to issue to device
4005 * Prepare an ATA command to submission to device.
4006 * This includes mapping the data into a DMA-able
4007 * area, filling in the S/G table, and finally
4008 * writing the taskfile to hardware, starting the command.
4011 * spin_lock_irqsave(host_set lock)
4014 * Zero on success, AC_ERR_* mask on failure
4017 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
4019 struct ata_port *ap = qc->ap;
4021 if (ata_should_dma_map(qc)) {
4022 if (qc->flags & ATA_QCFLAG_SG) {
4023 if (ata_sg_setup(qc))
4025 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4026 if (ata_sg_setup_one(qc))
4030 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4033 ap->ops->qc_prep(qc);
4035 qc->ap->active_tag = qc->tag;
4036 qc->flags |= ATA_QCFLAG_ACTIVE;
4038 return ap->ops->qc_issue(qc);
4041 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4042 return AC_ERR_SYSTEM;
4047 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4048 * @qc: command to issue to device
4050 * Using various libata functions and hooks, this function
4051 * starts an ATA command. ATA commands are grouped into
4052 * classes called "protocols", and issuing each type of protocol
4053 * is slightly different.
4055 * May be used as the qc_issue() entry in ata_port_operations.
4058 * spin_lock_irqsave(host_set lock)
4061 * Zero on success, AC_ERR_* mask on failure
4064 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4066 struct ata_port *ap = qc->ap;
4068 ata_dev_select(ap, qc->dev->devno, 1, 0);
4070 switch (qc->tf.protocol) {
4071 case ATA_PROT_NODATA:
4072 ata_tf_to_host(ap, &qc->tf);
4076 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4077 ap->ops->bmdma_setup(qc); /* set up bmdma */
4078 ap->ops->bmdma_start(qc); /* initiate bmdma */
4081 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4082 ata_qc_set_polling(qc);
4083 ata_tf_to_host(ap, &qc->tf);
4084 ap->hsm_task_state = HSM_ST;
4085 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4088 case ATA_PROT_ATAPI:
4089 ata_qc_set_polling(qc);
4090 ata_tf_to_host(ap, &qc->tf);
4091 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4094 case ATA_PROT_ATAPI_NODATA:
4095 ap->flags |= ATA_FLAG_NOINTR;
4096 ata_tf_to_host(ap, &qc->tf);
4097 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4100 case ATA_PROT_ATAPI_DMA:
4101 ap->flags |= ATA_FLAG_NOINTR;
4102 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4103 ap->ops->bmdma_setup(qc); /* set up bmdma */
4104 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4109 return AC_ERR_SYSTEM;
4116 * ata_host_intr - Handle host interrupt for given (port, task)
4117 * @ap: Port on which interrupt arrived (possibly...)
4118 * @qc: Taskfile currently active in engine
4120 * Handle host interrupt for given queued command. Currently,
4121 * only DMA interrupts are handled. All other commands are
4122 * handled via polling with interrupts disabled (nIEN bit).
4125 * spin_lock_irqsave(host_set lock)
4128 * One if interrupt was handled, zero if not (shared irq).
4131 inline unsigned int ata_host_intr (struct ata_port *ap,
4132 struct ata_queued_cmd *qc)
4134 u8 status, host_stat;
4136 switch (qc->tf.protocol) {
4139 case ATA_PROT_ATAPI_DMA:
4140 case ATA_PROT_ATAPI:
4141 /* check status of DMA engine */
4142 host_stat = ap->ops->bmdma_status(ap);
4143 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4145 /* if it's not our irq... */
4146 if (!(host_stat & ATA_DMA_INTR))
4149 /* before we do anything else, clear DMA-Start bit */
4150 ap->ops->bmdma_stop(qc);
4154 case ATA_PROT_ATAPI_NODATA:
4155 case ATA_PROT_NODATA:
4156 /* check altstatus */
4157 status = ata_altstatus(ap);
4158 if (status & ATA_BUSY)
4161 /* check main status, clearing INTRQ */
4162 status = ata_chk_status(ap);
4163 if (unlikely(status & ATA_BUSY))
4165 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4166 ap->id, qc->tf.protocol, status);
4168 /* ack bmdma irq events */
4169 ap->ops->irq_clear(ap);
4171 /* complete taskfile transaction */
4172 qc->err_mask |= ac_err_mask(status);
4173 ata_qc_complete(qc);
4180 return 1; /* irq handled */
4183 ap->stats.idle_irq++;
4186 if ((ap->stats.idle_irq % 1000) == 0) {
4187 ata_irq_ack(ap, 0); /* debug trap */
4188 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4192 return 0; /* irq not handled */
4196 * ata_interrupt - Default ATA host interrupt handler
4197 * @irq: irq line (unused)
4198 * @dev_instance: pointer to our ata_host_set information structure
4201 * Default interrupt handler for PCI IDE devices. Calls
4202 * ata_host_intr() for each port that is not disabled.
4205 * Obtains host_set lock during operation.
4208 * IRQ_NONE or IRQ_HANDLED.
4211 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4213 struct ata_host_set *host_set = dev_instance;
4215 unsigned int handled = 0;
4216 unsigned long flags;
4218 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4219 spin_lock_irqsave(&host_set->lock, flags);
4221 for (i = 0; i < host_set->n_ports; i++) {
4222 struct ata_port *ap;
4224 ap = host_set->ports[i];
4226 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4227 struct ata_queued_cmd *qc;
4229 qc = ata_qc_from_tag(ap, ap->active_tag);
4230 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4231 (qc->flags & ATA_QCFLAG_ACTIVE))
4232 handled |= ata_host_intr(ap, qc);
4236 spin_unlock_irqrestore(&host_set->lock, flags);
4238 return IRQ_RETVAL(handled);
4243 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4244 * without filling any other registers
4246 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4249 struct ata_taskfile tf;
4252 ata_tf_init(ap, &tf, dev->devno);
4255 tf.flags |= ATA_TFLAG_DEVICE;
4256 tf.protocol = ATA_PROT_NODATA;
4258 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4260 printk(KERN_ERR "%s: ata command failed: %d\n",
4266 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4270 if (!ata_try_flush_cache(dev))
4273 if (ata_id_has_flush_ext(dev->id))
4274 cmd = ATA_CMD_FLUSH_EXT;
4276 cmd = ATA_CMD_FLUSH;
4278 return ata_do_simple_cmd(ap, dev, cmd);
4281 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4283 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4286 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4288 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4292 * ata_device_resume - wakeup a previously suspended devices
4293 * @ap: port the device is connected to
4294 * @dev: the device to resume
4296 * Kick the drive back into action, by sending it an idle immediate
4297 * command and making sure its transfer mode matches between drive
4301 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4303 if (ap->flags & ATA_FLAG_SUSPENDED) {
4304 ap->flags &= ~ATA_FLAG_SUSPENDED;
4307 if (!ata_dev_present(dev))
4309 if (dev->class == ATA_DEV_ATA)
4310 ata_start_drive(ap, dev);
4316 * ata_device_suspend - prepare a device for suspend
4317 * @ap: port the device is connected to
4318 * @dev: the device to suspend
4320 * Flush the cache on the drive, if appropriate, then issue a
4321 * standbynow command.
4323 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
4325 if (!ata_dev_present(dev))
4327 if (dev->class == ATA_DEV_ATA)
4328 ata_flush_cache(ap, dev);
4330 ata_standby_drive(ap, dev);
4331 ap->flags |= ATA_FLAG_SUSPENDED;
4336 * ata_port_start - Set port up for dma.
4337 * @ap: Port to initialize
4339 * Called just after data structures for each port are
4340 * initialized. Allocates space for PRD table.
4342 * May be used as the port_start() entry in ata_port_operations.
4345 * Inherited from caller.
4348 int ata_port_start (struct ata_port *ap)
4350 struct device *dev = ap->host_set->dev;
4353 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4357 rc = ata_pad_alloc(ap, dev);
4359 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4363 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4370 * ata_port_stop - Undo ata_port_start()
4371 * @ap: Port to shut down
4373 * Frees the PRD table.
4375 * May be used as the port_stop() entry in ata_port_operations.
4378 * Inherited from caller.
4381 void ata_port_stop (struct ata_port *ap)
4383 struct device *dev = ap->host_set->dev;
4385 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4386 ata_pad_free(ap, dev);
4389 void ata_host_stop (struct ata_host_set *host_set)
4391 if (host_set->mmio_base)
4392 iounmap(host_set->mmio_base);
4397 * ata_host_remove - Unregister SCSI host structure with upper layers
4398 * @ap: Port to unregister
4399 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4402 * Inherited from caller.
4405 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4407 struct Scsi_Host *sh = ap->host;
4412 scsi_remove_host(sh);
4414 ap->ops->port_stop(ap);
4418 * ata_host_init - Initialize an ata_port structure
4419 * @ap: Structure to initialize
4420 * @host: associated SCSI mid-layer structure
4421 * @host_set: Collection of hosts to which @ap belongs
4422 * @ent: Probe information provided by low-level driver
4423 * @port_no: Port number associated with this ata_port
4425 * Initialize a new ata_port structure, and its associated
4429 * Inherited from caller.
4432 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4433 struct ata_host_set *host_set,
4434 const struct ata_probe_ent *ent, unsigned int port_no)
4440 host->max_channel = 1;
4441 host->unique_id = ata_unique_id++;
4442 host->max_cmd_len = 12;
4444 ap->flags = ATA_FLAG_PORT_DISABLED;
4445 ap->id = host->unique_id;
4447 ap->ctl = ATA_DEVCTL_OBS;
4448 ap->host_set = host_set;
4449 ap->port_no = port_no;
4451 ent->legacy_mode ? ent->hard_port_no : port_no;
4452 ap->pio_mask = ent->pio_mask;
4453 ap->mwdma_mask = ent->mwdma_mask;
4454 ap->udma_mask = ent->udma_mask;
4455 ap->flags |= ent->host_flags;
4456 ap->ops = ent->port_ops;
4457 ap->cbl = ATA_CBL_NONE;
4458 ap->active_tag = ATA_TAG_POISON;
4459 ap->last_ctl = 0xFF;
4461 INIT_WORK(&ap->port_task, NULL, NULL);
4462 INIT_LIST_HEAD(&ap->eh_done_q);
4464 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4465 struct ata_device *dev = &ap->device[i];
4467 dev->pio_mask = UINT_MAX;
4468 dev->mwdma_mask = UINT_MAX;
4469 dev->udma_mask = UINT_MAX;
4473 ap->stats.unhandled_irq = 1;
4474 ap->stats.idle_irq = 1;
4477 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4481 * ata_host_add - Attach low-level ATA driver to system
4482 * @ent: Information provided by low-level driver
4483 * @host_set: Collections of ports to which we add
4484 * @port_no: Port number associated with this host
4486 * Attach low-level ATA driver to system.
4489 * PCI/etc. bus probe sem.
4492 * New ata_port on success, for NULL on error.
4495 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4496 struct ata_host_set *host_set,
4497 unsigned int port_no)
4499 struct Scsi_Host *host;
4500 struct ata_port *ap;
4504 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4508 host->transportt = &ata_scsi_transport_template;
4510 ap = (struct ata_port *) &host->hostdata[0];
4512 ata_host_init(ap, host, host_set, ent, port_no);
4514 rc = ap->ops->port_start(ap);
4521 scsi_host_put(host);
4526 * ata_device_add - Register hardware device with ATA and SCSI layers
4527 * @ent: Probe information describing hardware device to be registered
4529 * This function processes the information provided in the probe
4530 * information struct @ent, allocates the necessary ATA and SCSI
4531 * host information structures, initializes them, and registers
4532 * everything with requisite kernel subsystems.
4534 * This function requests irqs, probes the ATA bus, and probes
4538 * PCI/etc. bus probe sem.
4541 * Number of ports registered. Zero on error (no ports registered).
4544 int ata_device_add(const struct ata_probe_ent *ent)
4546 unsigned int count = 0, i;
4547 struct device *dev = ent->dev;
4548 struct ata_host_set *host_set;
4551 /* alloc a container for our list of ATA ports (buses) */
4552 host_set = kzalloc(sizeof(struct ata_host_set) +
4553 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4556 spin_lock_init(&host_set->lock);
4558 host_set->dev = dev;
4559 host_set->n_ports = ent->n_ports;
4560 host_set->irq = ent->irq;
4561 host_set->mmio_base = ent->mmio_base;
4562 host_set->private_data = ent->private_data;
4563 host_set->ops = ent->port_ops;
4565 /* register each port bound to this device */
4566 for (i = 0; i < ent->n_ports; i++) {
4567 struct ata_port *ap;
4568 unsigned long xfer_mode_mask;
4570 ap = ata_host_add(ent, host_set, i);
4574 host_set->ports[i] = ap;
4575 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4576 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4577 (ap->pio_mask << ATA_SHIFT_PIO);
4579 /* print per-port info to dmesg */
4580 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4581 "bmdma 0x%lX irq %lu\n",
4583 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4584 ata_mode_string(xfer_mode_mask),
4585 ap->ioaddr.cmd_addr,
4586 ap->ioaddr.ctl_addr,
4587 ap->ioaddr.bmdma_addr,
4591 host_set->ops->irq_clear(ap);
4598 /* obtain irq, that is shared between channels */
4599 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4600 DRV_NAME, host_set))
4603 /* perform each probe synchronously */
4604 DPRINTK("probe begin\n");
4605 for (i = 0; i < count; i++) {
4606 struct ata_port *ap;
4609 ap = host_set->ports[i];
4611 DPRINTK("ata%u: bus probe begin\n", ap->id);
4612 rc = ata_bus_probe(ap);
4613 DPRINTK("ata%u: bus probe end\n", ap->id);
4616 /* FIXME: do something useful here?
4617 * Current libata behavior will
4618 * tear down everything when
4619 * the module is removed
4620 * or the h/w is unplugged.
4624 rc = scsi_add_host(ap->host, dev);
4626 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4628 /* FIXME: do something useful here */
4629 /* FIXME: handle unconditional calls to
4630 * scsi_scan_host and ata_host_remove, below,
4636 /* probes are done, now scan each port's disk(s) */
4637 DPRINTK("host probe begin\n");
4638 for (i = 0; i < count; i++) {
4639 struct ata_port *ap = host_set->ports[i];
4641 ata_scsi_scan_host(ap);
4644 dev_set_drvdata(dev, host_set);
4646 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4647 return ent->n_ports; /* success */
4650 for (i = 0; i < count; i++) {
4651 ata_host_remove(host_set->ports[i], 1);
4652 scsi_host_put(host_set->ports[i]->host);
4656 VPRINTK("EXIT, returning 0\n");
4661 * ata_host_set_remove - PCI layer callback for device removal
4662 * @host_set: ATA host set that was removed
4664 * Unregister all objects associated with this host set. Free those
4668 * Inherited from calling layer (may sleep).
4671 void ata_host_set_remove(struct ata_host_set *host_set)
4673 struct ata_port *ap;
4676 for (i = 0; i < host_set->n_ports; i++) {
4677 ap = host_set->ports[i];
4678 scsi_remove_host(ap->host);
4681 free_irq(host_set->irq, host_set);
4683 for (i = 0; i < host_set->n_ports; i++) {
4684 ap = host_set->ports[i];
4686 ata_scsi_release(ap->host);
4688 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4689 struct ata_ioports *ioaddr = &ap->ioaddr;
4691 if (ioaddr->cmd_addr == 0x1f0)
4692 release_region(0x1f0, 8);
4693 else if (ioaddr->cmd_addr == 0x170)
4694 release_region(0x170, 8);
4697 scsi_host_put(ap->host);
4700 if (host_set->ops->host_stop)
4701 host_set->ops->host_stop(host_set);
4707 * ata_scsi_release - SCSI layer callback hook for host unload
4708 * @host: libata host to be unloaded
4710 * Performs all duties necessary to shut down a libata port...
4711 * Kill port kthread, disable port, and release resources.
4714 * Inherited from SCSI layer.
4720 int ata_scsi_release(struct Scsi_Host *host)
4722 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4727 ap->ops->port_disable(ap);
4728 ata_host_remove(ap, 0);
4729 for (i = 0; i < ATA_MAX_DEVICES; i++)
4730 kfree(ap->device[i].id);
4737 * ata_std_ports - initialize ioaddr with standard port offsets.
4738 * @ioaddr: IO address structure to be initialized
4740 * Utility function which initializes data_addr, error_addr,
4741 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4742 * device_addr, status_addr, and command_addr to standard offsets
4743 * relative to cmd_addr.
4745 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4748 void ata_std_ports(struct ata_ioports *ioaddr)
4750 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4751 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4752 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4753 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4754 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4755 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4756 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4757 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4758 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4759 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4765 void ata_pci_host_stop (struct ata_host_set *host_set)
4767 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4769 pci_iounmap(pdev, host_set->mmio_base);
4773 * ata_pci_remove_one - PCI layer callback for device removal
4774 * @pdev: PCI device that was removed
4776 * PCI layer indicates to libata via this hook that
4777 * hot-unplug or module unload event has occurred.
4778 * Handle this by unregistering all objects associated
4779 * with this PCI device. Free those objects. Then finally
4780 * release PCI resources and disable device.
4783 * Inherited from PCI layer (may sleep).
4786 void ata_pci_remove_one (struct pci_dev *pdev)
4788 struct device *dev = pci_dev_to_dev(pdev);
4789 struct ata_host_set *host_set = dev_get_drvdata(dev);
4791 ata_host_set_remove(host_set);
4792 pci_release_regions(pdev);
4793 pci_disable_device(pdev);
4794 dev_set_drvdata(dev, NULL);
4797 /* move to PCI subsystem */
4798 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4800 unsigned long tmp = 0;
4802 switch (bits->width) {
4805 pci_read_config_byte(pdev, bits->reg, &tmp8);
4811 pci_read_config_word(pdev, bits->reg, &tmp16);
4817 pci_read_config_dword(pdev, bits->reg, &tmp32);
4828 return (tmp == bits->val) ? 1 : 0;
4831 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4833 pci_save_state(pdev);
4834 pci_disable_device(pdev);
4835 pci_set_power_state(pdev, PCI_D3hot);
4839 int ata_pci_device_resume(struct pci_dev *pdev)
4841 pci_set_power_state(pdev, PCI_D0);
4842 pci_restore_state(pdev);
4843 pci_enable_device(pdev);
4844 pci_set_master(pdev);
4847 #endif /* CONFIG_PCI */
4850 static int __init ata_init(void)
4852 ata_wq = create_workqueue("ata");
4856 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4860 static void __exit ata_exit(void)
4862 destroy_workqueue(ata_wq);
4865 module_init(ata_init);
4866 module_exit(ata_exit);
4868 static unsigned long ratelimit_time;
4869 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4871 int ata_ratelimit(void)
4874 unsigned long flags;
4876 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4878 if (time_after(jiffies, ratelimit_time)) {
4880 ratelimit_time = jiffies + (HZ/5);
4884 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4890 * libata is essentially a library of internal helper functions for
4891 * low-level ATA host controller drivers. As such, the API/ABI is
4892 * likely to change as new drivers are added and updated.
4893 * Do not depend on ABI/API stability.
4896 EXPORT_SYMBOL_GPL(ata_std_bios_param);
4897 EXPORT_SYMBOL_GPL(ata_std_ports);
4898 EXPORT_SYMBOL_GPL(ata_device_add);
4899 EXPORT_SYMBOL_GPL(ata_host_set_remove);
4900 EXPORT_SYMBOL_GPL(ata_sg_init);
4901 EXPORT_SYMBOL_GPL(ata_sg_init_one);
4902 EXPORT_SYMBOL_GPL(__ata_qc_complete);
4903 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4904 EXPORT_SYMBOL_GPL(ata_eng_timeout);
4905 EXPORT_SYMBOL_GPL(ata_tf_load);
4906 EXPORT_SYMBOL_GPL(ata_tf_read);
4907 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4908 EXPORT_SYMBOL_GPL(ata_std_dev_select);
4909 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4910 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4911 EXPORT_SYMBOL_GPL(ata_check_status);
4912 EXPORT_SYMBOL_GPL(ata_altstatus);
4913 EXPORT_SYMBOL_GPL(ata_exec_command);
4914 EXPORT_SYMBOL_GPL(ata_port_start);
4915 EXPORT_SYMBOL_GPL(ata_port_stop);
4916 EXPORT_SYMBOL_GPL(ata_host_stop);
4917 EXPORT_SYMBOL_GPL(ata_interrupt);
4918 EXPORT_SYMBOL_GPL(ata_qc_prep);
4919 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
4920 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4921 EXPORT_SYMBOL_GPL(ata_bmdma_start);
4922 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4923 EXPORT_SYMBOL_GPL(ata_bmdma_status);
4924 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4925 EXPORT_SYMBOL_GPL(ata_port_probe);
4926 EXPORT_SYMBOL_GPL(sata_phy_reset);
4927 EXPORT_SYMBOL_GPL(__sata_phy_reset);
4928 EXPORT_SYMBOL_GPL(ata_bus_reset);
4929 EXPORT_SYMBOL_GPL(ata_std_probeinit);
4930 EXPORT_SYMBOL_GPL(ata_std_softreset);
4931 EXPORT_SYMBOL_GPL(sata_std_hardreset);
4932 EXPORT_SYMBOL_GPL(ata_std_postreset);
4933 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
4934 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
4935 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
4936 EXPORT_SYMBOL_GPL(ata_port_disable);
4937 EXPORT_SYMBOL_GPL(ata_ratelimit);
4938 EXPORT_SYMBOL_GPL(ata_busy_sleep);
4939 EXPORT_SYMBOL_GPL(ata_port_queue_task);
4940 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
4941 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4942 EXPORT_SYMBOL_GPL(ata_scsi_error);
4943 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
4944 EXPORT_SYMBOL_GPL(ata_scsi_release);
4945 EXPORT_SYMBOL_GPL(ata_host_intr);
4946 EXPORT_SYMBOL_GPL(ata_dev_classify);
4947 EXPORT_SYMBOL_GPL(ata_id_string);
4948 EXPORT_SYMBOL_GPL(ata_id_c_string);
4949 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
4950 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
4951 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
4953 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
4954 EXPORT_SYMBOL_GPL(ata_timing_compute);
4955 EXPORT_SYMBOL_GPL(ata_timing_merge);
4958 EXPORT_SYMBOL_GPL(pci_test_config_bits);
4959 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
4960 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
4961 EXPORT_SYMBOL_GPL(ata_pci_init_one);
4962 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
4963 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
4964 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
4965 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
4966 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
4967 #endif /* CONFIG_PCI */
4969 EXPORT_SYMBOL_GPL(ata_device_suspend);
4970 EXPORT_SYMBOL_GPL(ata_device_resume);
4971 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
4972 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);