2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_port *ap,
65 struct ata_device *dev);
66 static void ata_set_mode(struct ata_port *ap);
67 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
68 struct ata_device *dev);
69 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev);
71 static unsigned int ata_unique_id = 1;
72 static struct workqueue_struct *ata_wq;
74 int atapi_enabled = 1;
75 module_param(atapi_enabled, int, 0444);
76 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
79 module_param_named(fua, libata_fua, int, 0444);
80 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
82 MODULE_AUTHOR("Jeff Garzik");
83 MODULE_DESCRIPTION("Library module for ATA devices");
84 MODULE_LICENSE("GPL");
85 MODULE_VERSION(DRV_VERSION);
89 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
90 * @tf: Taskfile to convert
91 * @fis: Buffer into which data will output
92 * @pmp: Port multiplier port
94 * Converts a standard ATA taskfile to a Serial ATA
95 * FIS structure (Register - Host to Device).
98 * Inherited from caller.
101 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
103 fis[0] = 0x27; /* Register - Host to Device FIS */
104 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
105 bit 7 indicates Command FIS */
106 fis[2] = tf->command;
107 fis[3] = tf->feature;
114 fis[8] = tf->hob_lbal;
115 fis[9] = tf->hob_lbam;
116 fis[10] = tf->hob_lbah;
117 fis[11] = tf->hob_feature;
120 fis[13] = tf->hob_nsect;
131 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
132 * @fis: Buffer from which data will be input
133 * @tf: Taskfile to output
135 * Converts a serial ATA FIS structure to a standard ATA taskfile.
138 * Inherited from caller.
141 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
143 tf->command = fis[2]; /* status */
144 tf->feature = fis[3]; /* error */
151 tf->hob_lbal = fis[8];
152 tf->hob_lbam = fis[9];
153 tf->hob_lbah = fis[10];
156 tf->hob_nsect = fis[13];
159 static const u8 ata_rw_cmds[] = {
163 ATA_CMD_READ_MULTI_EXT,
164 ATA_CMD_WRITE_MULTI_EXT,
168 ATA_CMD_WRITE_MULTI_FUA_EXT,
172 ATA_CMD_PIO_READ_EXT,
173 ATA_CMD_PIO_WRITE_EXT,
186 ATA_CMD_WRITE_FUA_EXT
190 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
191 * @qc: command to examine and configure
193 * Examine the device configuration and tf->flags to calculate
194 * the proper read/write commands and protocol to use.
199 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
201 struct ata_taskfile *tf = &qc->tf;
202 struct ata_device *dev = qc->dev;
205 int index, fua, lba48, write;
207 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
208 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
209 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
211 if (dev->flags & ATA_DFLAG_PIO) {
212 tf->protocol = ATA_PROT_PIO;
213 index = dev->multi_count ? 0 : 8;
214 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
215 /* Unable to use DMA due to host limitation */
216 tf->protocol = ATA_PROT_PIO;
217 index = dev->multi_count ? 0 : 8;
219 tf->protocol = ATA_PROT_DMA;
223 cmd = ata_rw_cmds[index + fua + lba48 + write];
232 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
233 * @pio_mask: pio_mask
234 * @mwdma_mask: mwdma_mask
235 * @udma_mask: udma_mask
237 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
238 * unsigned int xfer_mask.
246 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
247 unsigned int mwdma_mask,
248 unsigned int udma_mask)
250 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
251 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
252 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
256 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
257 * @xfer_mask: xfer_mask to unpack
258 * @pio_mask: resulting pio_mask
259 * @mwdma_mask: resulting mwdma_mask
260 * @udma_mask: resulting udma_mask
262 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
263 * Any NULL distination masks will be ignored.
265 static void ata_unpack_xfermask(unsigned int xfer_mask,
266 unsigned int *pio_mask,
267 unsigned int *mwdma_mask,
268 unsigned int *udma_mask)
271 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
273 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
275 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
278 static const struct ata_xfer_ent {
279 unsigned int shift, bits;
282 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
283 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
284 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
289 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
290 * @xfer_mask: xfer_mask of interest
292 * Return matching XFER_* value for @xfer_mask. Only the highest
293 * bit of @xfer_mask is considered.
299 * Matching XFER_* value, 0 if no match found.
301 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
303 int highbit = fls(xfer_mask) - 1;
304 const struct ata_xfer_ent *ent;
306 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
307 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
308 return ent->base + highbit - ent->shift;
313 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
314 * @xfer_mode: XFER_* of interest
316 * Return matching xfer_mask for @xfer_mode.
322 * Matching xfer_mask, 0 if no match found.
324 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
326 const struct ata_xfer_ent *ent;
328 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
329 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
330 return 1 << (ent->shift + xfer_mode - ent->base);
335 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
336 * @xfer_mode: XFER_* of interest
338 * Return matching xfer_shift for @xfer_mode.
344 * Matching xfer_shift, -1 if no match found.
346 static int ata_xfer_mode2shift(unsigned int xfer_mode)
348 const struct ata_xfer_ent *ent;
350 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
351 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
357 * ata_mode_string - convert xfer_mask to string
358 * @xfer_mask: mask of bits supported; only highest bit counts.
360 * Determine string which represents the highest speed
361 * (highest bit in @modemask).
367 * Constant C string representing highest speed listed in
368 * @mode_mask, or the constant C string "<n/a>".
370 static const char *ata_mode_string(unsigned int xfer_mask)
372 static const char * const xfer_mode_str[] = {
392 highbit = fls(xfer_mask) - 1;
393 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
394 return xfer_mode_str[highbit];
398 static void ata_dev_disable(struct ata_port *ap, struct ata_device *dev)
400 if (ata_dev_present(dev)) {
401 printk(KERN_WARNING "ata%u: dev %u disabled\n",
408 * ata_pio_devchk - PATA device presence detection
409 * @ap: ATA channel to examine
410 * @device: Device to examine (starting at zero)
412 * This technique was originally described in
413 * Hale Landis's ATADRVR (www.ata-atapi.com), and
414 * later found its way into the ATA/ATAPI spec.
416 * Write a pattern to the ATA shadow registers,
417 * and if a device is present, it will respond by
418 * correctly storing and echoing back the
419 * ATA shadow register contents.
425 static unsigned int ata_pio_devchk(struct ata_port *ap,
428 struct ata_ioports *ioaddr = &ap->ioaddr;
431 ap->ops->dev_select(ap, device);
433 outb(0x55, ioaddr->nsect_addr);
434 outb(0xaa, ioaddr->lbal_addr);
436 outb(0xaa, ioaddr->nsect_addr);
437 outb(0x55, ioaddr->lbal_addr);
439 outb(0x55, ioaddr->nsect_addr);
440 outb(0xaa, ioaddr->lbal_addr);
442 nsect = inb(ioaddr->nsect_addr);
443 lbal = inb(ioaddr->lbal_addr);
445 if ((nsect == 0x55) && (lbal == 0xaa))
446 return 1; /* we found a device */
448 return 0; /* nothing found */
452 * ata_mmio_devchk - PATA device presence detection
453 * @ap: ATA channel to examine
454 * @device: Device to examine (starting at zero)
456 * This technique was originally described in
457 * Hale Landis's ATADRVR (www.ata-atapi.com), and
458 * later found its way into the ATA/ATAPI spec.
460 * Write a pattern to the ATA shadow registers,
461 * and if a device is present, it will respond by
462 * correctly storing and echoing back the
463 * ATA shadow register contents.
469 static unsigned int ata_mmio_devchk(struct ata_port *ap,
472 struct ata_ioports *ioaddr = &ap->ioaddr;
475 ap->ops->dev_select(ap, device);
477 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
478 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
480 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
481 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
483 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
484 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
486 nsect = readb((void __iomem *) ioaddr->nsect_addr);
487 lbal = readb((void __iomem *) ioaddr->lbal_addr);
489 if ((nsect == 0x55) && (lbal == 0xaa))
490 return 1; /* we found a device */
492 return 0; /* nothing found */
496 * ata_devchk - PATA device presence detection
497 * @ap: ATA channel to examine
498 * @device: Device to examine (starting at zero)
500 * Dispatch ATA device presence detection, depending
501 * on whether we are using PIO or MMIO to talk to the
502 * ATA shadow registers.
508 static unsigned int ata_devchk(struct ata_port *ap,
511 if (ap->flags & ATA_FLAG_MMIO)
512 return ata_mmio_devchk(ap, device);
513 return ata_pio_devchk(ap, device);
517 * ata_dev_classify - determine device type based on ATA-spec signature
518 * @tf: ATA taskfile register set for device to be identified
520 * Determine from taskfile register contents whether a device is
521 * ATA or ATAPI, as per "Signature and persistence" section
522 * of ATA/PI spec (volume 1, sect 5.14).
528 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
529 * the event of failure.
532 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
534 /* Apple's open source Darwin code hints that some devices only
535 * put a proper signature into the LBA mid/high registers,
536 * So, we only check those. It's sufficient for uniqueness.
539 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
540 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
541 DPRINTK("found ATA device by sig\n");
545 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
546 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
547 DPRINTK("found ATAPI device by sig\n");
548 return ATA_DEV_ATAPI;
551 DPRINTK("unknown device\n");
552 return ATA_DEV_UNKNOWN;
556 * ata_dev_try_classify - Parse returned ATA device signature
557 * @ap: ATA channel to examine
558 * @device: Device to examine (starting at zero)
559 * @r_err: Value of error register on completion
561 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
562 * an ATA/ATAPI-defined set of values is placed in the ATA
563 * shadow registers, indicating the results of device detection
566 * Select the ATA device, and read the values from the ATA shadow
567 * registers. Then parse according to the Error register value,
568 * and the spec-defined values examined by ata_dev_classify().
574 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
578 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
580 struct ata_taskfile tf;
584 ap->ops->dev_select(ap, device);
586 memset(&tf, 0, sizeof(tf));
588 ap->ops->tf_read(ap, &tf);
593 /* see if device passed diags */
596 else if ((device == 0) && (err == 0x81))
601 /* determine if device is ATA or ATAPI */
602 class = ata_dev_classify(&tf);
604 if (class == ATA_DEV_UNKNOWN)
606 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
612 * ata_id_string - Convert IDENTIFY DEVICE page into string
613 * @id: IDENTIFY DEVICE results we will examine
614 * @s: string into which data is output
615 * @ofs: offset into identify device page
616 * @len: length of string to return. must be an even number.
618 * The strings in the IDENTIFY DEVICE page are broken up into
619 * 16-bit chunks. Run through the string, and output each
620 * 8-bit chunk linearly, regardless of platform.
626 void ata_id_string(const u16 *id, unsigned char *s,
627 unsigned int ofs, unsigned int len)
646 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
647 * @id: IDENTIFY DEVICE results we will examine
648 * @s: string into which data is output
649 * @ofs: offset into identify device page
650 * @len: length of string to return. must be an odd number.
652 * This function is identical to ata_id_string except that it
653 * trims trailing spaces and terminates the resulting string with
654 * null. @len must be actual maximum length (even number) + 1.
659 void ata_id_c_string(const u16 *id, unsigned char *s,
660 unsigned int ofs, unsigned int len)
666 ata_id_string(id, s, ofs, len - 1);
668 p = s + strnlen(s, len - 1);
669 while (p > s && p[-1] == ' ')
674 static u64 ata_id_n_sectors(const u16 *id)
676 if (ata_id_has_lba(id)) {
677 if (ata_id_has_lba48(id))
678 return ata_id_u64(id, 100);
680 return ata_id_u32(id, 60);
682 if (ata_id_current_chs_valid(id))
683 return ata_id_u32(id, 57);
685 return id[1] * id[3] * id[6];
690 * ata_noop_dev_select - Select device 0/1 on ATA bus
691 * @ap: ATA channel to manipulate
692 * @device: ATA device (numbered from zero) to select
694 * This function performs no actual function.
696 * May be used as the dev_select() entry in ata_port_operations.
701 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
707 * ata_std_dev_select - Select device 0/1 on ATA bus
708 * @ap: ATA channel to manipulate
709 * @device: ATA device (numbered from zero) to select
711 * Use the method defined in the ATA specification to
712 * make either device 0, or device 1, active on the
713 * ATA channel. Works with both PIO and MMIO.
715 * May be used as the dev_select() entry in ata_port_operations.
721 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
726 tmp = ATA_DEVICE_OBS;
728 tmp = ATA_DEVICE_OBS | ATA_DEV1;
730 if (ap->flags & ATA_FLAG_MMIO) {
731 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
733 outb(tmp, ap->ioaddr.device_addr);
735 ata_pause(ap); /* needed; also flushes, for mmio */
739 * ata_dev_select - Select device 0/1 on ATA bus
740 * @ap: ATA channel to manipulate
741 * @device: ATA device (numbered from zero) to select
742 * @wait: non-zero to wait for Status register BSY bit to clear
743 * @can_sleep: non-zero if context allows sleeping
745 * Use the method defined in the ATA specification to
746 * make either device 0, or device 1, active on the
749 * This is a high-level version of ata_std_dev_select(),
750 * which additionally provides the services of inserting
751 * the proper pauses and status polling, where needed.
757 void ata_dev_select(struct ata_port *ap, unsigned int device,
758 unsigned int wait, unsigned int can_sleep)
760 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
761 ap->id, device, wait);
766 ap->ops->dev_select(ap, device);
769 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
776 * ata_dump_id - IDENTIFY DEVICE info debugging output
777 * @id: IDENTIFY DEVICE page to dump
779 * Dump selected 16-bit words from the given IDENTIFY DEVICE
786 static inline void ata_dump_id(const u16 *id)
788 DPRINTK("49==0x%04x "
798 DPRINTK("80==0x%04x "
808 DPRINTK("88==0x%04x "
815 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
816 * @id: IDENTIFY data to compute xfer mask from
818 * Compute the xfermask for this device. This is not as trivial
819 * as it seems if we must consider early devices correctly.
821 * FIXME: pre IDE drive timing (do we care ?).
829 static unsigned int ata_id_xfermask(const u16 *id)
831 unsigned int pio_mask, mwdma_mask, udma_mask;
833 /* Usual case. Word 53 indicates word 64 is valid */
834 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
835 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
839 /* If word 64 isn't valid then Word 51 high byte holds
840 * the PIO timing number for the maximum. Turn it into
843 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
845 /* But wait.. there's more. Design your standards by
846 * committee and you too can get a free iordy field to
847 * process. However its the speeds not the modes that
848 * are supported... Note drivers using the timing API
849 * will get this right anyway
853 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
856 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
857 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
859 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
863 * ata_port_queue_task - Queue port_task
864 * @ap: The ata_port to queue port_task for
866 * Schedule @fn(@data) for execution after @delay jiffies using
867 * port_task. There is one port_task per port and it's the
868 * user(low level driver)'s responsibility to make sure that only
869 * one task is active at any given time.
871 * libata core layer takes care of synchronization between
872 * port_task and EH. ata_port_queue_task() may be ignored for EH
876 * Inherited from caller.
878 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
883 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
886 PREPARE_WORK(&ap->port_task, fn, data);
889 rc = queue_work(ata_wq, &ap->port_task);
891 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
893 /* rc == 0 means that another user is using port task */
898 * ata_port_flush_task - Flush port_task
899 * @ap: The ata_port to flush port_task for
901 * After this function completes, port_task is guranteed not to
902 * be running or scheduled.
905 * Kernel thread context (may sleep)
907 void ata_port_flush_task(struct ata_port *ap)
913 spin_lock_irqsave(&ap->host_set->lock, flags);
914 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
915 spin_unlock_irqrestore(&ap->host_set->lock, flags);
917 DPRINTK("flush #1\n");
918 flush_workqueue(ata_wq);
921 * At this point, if a task is running, it's guaranteed to see
922 * the FLUSH flag; thus, it will never queue pio tasks again.
925 if (!cancel_delayed_work(&ap->port_task)) {
926 DPRINTK("flush #2\n");
927 flush_workqueue(ata_wq);
930 spin_lock_irqsave(&ap->host_set->lock, flags);
931 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
932 spin_unlock_irqrestore(&ap->host_set->lock, flags);
937 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
939 struct completion *waiting = qc->private_data;
941 qc->ap->ops->tf_read(qc->ap, &qc->tf);
946 * ata_exec_internal - execute libata internal command
947 * @ap: Port to which the command is sent
948 * @dev: Device to which the command is sent
949 * @tf: Taskfile registers for the command and the result
950 * @dma_dir: Data tranfer direction of the command
951 * @buf: Data buffer of the command
952 * @buflen: Length of data buffer
954 * Executes libata internal command with timeout. @tf contains
955 * command on entry and result on return. Timeout and error
956 * conditions are reported via return value. No recovery action
957 * is taken after a command times out. It's caller's duty to
958 * clean up after timeout.
961 * None. Should be called with kernel context, might sleep.
965 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
966 struct ata_taskfile *tf,
967 int dma_dir, void *buf, unsigned int buflen)
969 u8 command = tf->command;
970 struct ata_queued_cmd *qc;
971 DECLARE_COMPLETION(wait);
973 unsigned int err_mask;
975 spin_lock_irqsave(&ap->host_set->lock, flags);
977 qc = ata_qc_new_init(ap, dev);
981 qc->dma_dir = dma_dir;
982 if (dma_dir != DMA_NONE) {
983 ata_sg_init_one(qc, buf, buflen);
984 qc->nsect = buflen / ATA_SECT_SIZE;
987 qc->private_data = &wait;
988 qc->complete_fn = ata_qc_complete_internal;
990 qc->err_mask = ata_qc_issue(qc);
994 spin_unlock_irqrestore(&ap->host_set->lock, flags);
996 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
997 ata_port_flush_task(ap);
999 spin_lock_irqsave(&ap->host_set->lock, flags);
1001 /* We're racing with irq here. If we lose, the
1002 * following test prevents us from completing the qc
1003 * again. If completion irq occurs after here but
1004 * before the caller cleans up, it will result in a
1005 * spurious interrupt. We can live with that.
1007 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1008 qc->err_mask = AC_ERR_TIMEOUT;
1009 ata_qc_complete(qc);
1010 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
1014 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1018 err_mask = qc->err_mask;
1022 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1023 * Until those drivers are fixed, we detect the condition
1024 * here, fail the command with AC_ERR_SYSTEM and reenable the
1027 * Note that this doesn't change any behavior as internal
1028 * command failure results in disabling the device in the
1029 * higher layer for LLDDs without new reset/EH callbacks.
1031 * Kill the following code as soon as those drivers are fixed.
1033 if (ap->flags & ATA_FLAG_PORT_DISABLED) {
1034 err_mask |= AC_ERR_SYSTEM;
1042 * ata_pio_need_iordy - check if iordy needed
1045 * Check if the current speed of the device requires IORDY. Used
1046 * by various controllers for chip configuration.
1049 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1052 int speed = adev->pio_mode - XFER_PIO_0;
1059 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1061 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1062 pio = adev->id[ATA_ID_EIDE_PIO];
1063 /* Is the speed faster than the drive allows non IORDY ? */
1065 /* This is cycle times not frequency - watch the logic! */
1066 if (pio > 240) /* PIO2 is 240nS per cycle */
1075 * ata_dev_read_id - Read ID data from the specified device
1076 * @ap: port on which target device resides
1077 * @dev: target device
1078 * @p_class: pointer to class of the target device (may be changed)
1079 * @post_reset: is this read ID post-reset?
1080 * @p_id: read IDENTIFY page (newly allocated)
1082 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1083 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1084 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1085 * for pre-ATA4 drives.
1088 * Kernel thread context (may sleep)
1091 * 0 on success, -errno otherwise.
1093 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
1094 unsigned int *p_class, int post_reset, u16 **p_id)
1096 unsigned int class = *p_class;
1097 struct ata_taskfile tf;
1098 unsigned int err_mask = 0;
1103 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1105 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1107 id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
1110 reason = "out of memory";
1115 ata_tf_init(ap, &tf, dev->devno);
1119 tf.command = ATA_CMD_ID_ATA;
1122 tf.command = ATA_CMD_ID_ATAPI;
1126 reason = "unsupported class";
1130 tf.protocol = ATA_PROT_PIO;
1132 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
1133 id, sizeof(id[0]) * ATA_ID_WORDS);
1136 reason = "I/O error";
1140 swap_buf_le16(id, ATA_ID_WORDS);
1143 if ((class == ATA_DEV_ATA) != ata_id_is_ata(id)) {
1145 reason = "device reports illegal type";
1149 if (post_reset && class == ATA_DEV_ATA) {
1151 * The exact sequence expected by certain pre-ATA4 drives is:
1154 * INITIALIZE DEVICE PARAMETERS
1156 * Some drives were very specific about that exact sequence.
1158 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1159 err_mask = ata_dev_init_params(ap, dev);
1162 reason = "INIT_DEV_PARAMS failed";
1166 /* current CHS translation info (id[53-58]) might be
1167 * changed. reread the identify device info.
1179 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1180 ap->id, dev->devno, reason);
1185 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1186 struct ata_device *dev)
1188 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1192 * ata_dev_configure - Configure the specified ATA/ATAPI device
1193 * @ap: Port on which target device resides
1194 * @dev: Target device to configure
1195 * @print_info: Enable device info printout
1197 * Configure @dev according to @dev->id. Generic and low-level
1198 * driver specific fixups are also applied.
1201 * Kernel thread context (may sleep)
1204 * 0 on success, -errno otherwise
1206 static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
1209 const u16 *id = dev->id;
1210 unsigned int xfer_mask;
1213 if (!ata_dev_present(dev)) {
1214 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1215 ap->id, dev->devno);
1219 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1221 /* print device capabilities */
1223 printk(KERN_DEBUG "ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1224 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1225 ap->id, dev->devno, id[49], id[82], id[83],
1226 id[84], id[85], id[86], id[87], id[88]);
1228 /* initialize to-be-configured parameters */
1230 dev->max_sectors = 0;
1238 * common ATA, ATAPI feature tests
1241 /* find max transfer mode; for printk only */
1242 xfer_mask = ata_id_xfermask(id);
1246 /* ATA-specific feature tests */
1247 if (dev->class == ATA_DEV_ATA) {
1248 dev->n_sectors = ata_id_n_sectors(id);
1250 if (ata_id_has_lba(id)) {
1251 const char *lba_desc;
1254 dev->flags |= ATA_DFLAG_LBA;
1255 if (ata_id_has_lba48(id)) {
1256 dev->flags |= ATA_DFLAG_LBA48;
1260 /* print device info to dmesg */
1262 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1263 "max %s, %Lu sectors: %s\n",
1265 ata_id_major_version(id),
1266 ata_mode_string(xfer_mask),
1267 (unsigned long long)dev->n_sectors,
1272 /* Default translation */
1273 dev->cylinders = id[1];
1275 dev->sectors = id[6];
1277 if (ata_id_current_chs_valid(id)) {
1278 /* Current CHS translation is valid. */
1279 dev->cylinders = id[54];
1280 dev->heads = id[55];
1281 dev->sectors = id[56];
1284 /* print device info to dmesg */
1286 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1287 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1289 ata_id_major_version(id),
1290 ata_mode_string(xfer_mask),
1291 (unsigned long long)dev->n_sectors,
1292 dev->cylinders, dev->heads, dev->sectors);
1295 if (dev->id[59] & 0x100) {
1296 dev->multi_count = dev->id[59] & 0xff;
1297 DPRINTK("ata%u: dev %u multi count %u\n",
1298 ap->id, device, dev->multi_count);
1304 /* ATAPI-specific feature tests */
1305 else if (dev->class == ATA_DEV_ATAPI) {
1306 rc = atapi_cdb_len(id);
1307 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1308 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1312 dev->cdb_len = (unsigned int) rc;
1314 if (ata_id_cdb_intr(dev->id))
1315 dev->flags |= ATA_DFLAG_CDB_INTR;
1317 /* print device info to dmesg */
1319 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1320 ap->id, dev->devno, ata_mode_string(xfer_mask));
1323 ap->host->max_cmd_len = 0;
1324 for (i = 0; i < ATA_MAX_DEVICES; i++)
1325 ap->host->max_cmd_len = max_t(unsigned int,
1326 ap->host->max_cmd_len,
1327 ap->device[i].cdb_len);
1329 /* limit bridge transfers to udma5, 200 sectors */
1330 if (ata_dev_knobble(ap, dev)) {
1332 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1333 ap->id, dev->devno);
1334 dev->udma_mask &= ATA_UDMA5;
1335 dev->max_sectors = ATA_MAX_SECTORS;
1338 if (ap->ops->dev_config)
1339 ap->ops->dev_config(ap, dev);
1341 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1345 DPRINTK("EXIT, err\n");
1350 * ata_bus_probe - Reset and probe ATA bus
1353 * Master ATA bus probing function. Initiates a hardware-dependent
1354 * bus reset, then attempts to identify any devices found on
1358 * PCI/etc. bus probe sem.
1361 * Zero on success, non-zero on error.
1364 static int ata_bus_probe(struct ata_port *ap)
1366 unsigned int classes[ATA_MAX_DEVICES];
1367 unsigned int i, rc, found = 0;
1371 /* reset and determine device classes */
1372 for (i = 0; i < ATA_MAX_DEVICES; i++)
1373 classes[i] = ATA_DEV_UNKNOWN;
1375 if (ap->ops->probe_reset) {
1376 rc = ap->ops->probe_reset(ap, classes);
1378 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1382 ap->ops->phy_reset(ap);
1384 if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
1385 for (i = 0; i < ATA_MAX_DEVICES; i++)
1386 classes[i] = ap->device[i].class;
1391 for (i = 0; i < ATA_MAX_DEVICES; i++)
1392 if (classes[i] == ATA_DEV_UNKNOWN)
1393 classes[i] = ATA_DEV_NONE;
1395 /* read IDENTIFY page and configure devices */
1396 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1397 struct ata_device *dev = &ap->device[i];
1399 dev->class = classes[i];
1401 if (!ata_dev_present(dev))
1404 WARN_ON(dev->id != NULL);
1405 if (ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id)) {
1406 dev->class = ATA_DEV_NONE;
1410 if (ata_dev_configure(ap, dev, 1)) {
1411 ata_dev_disable(ap, dev);
1419 goto err_out_disable;
1422 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1423 goto err_out_disable;
1428 ap->ops->port_disable(ap);
1433 * ata_port_probe - Mark port as enabled
1434 * @ap: Port for which we indicate enablement
1436 * Modify @ap data structure such that the system
1437 * thinks that the entire port is enabled.
1439 * LOCKING: host_set lock, or some other form of
1443 void ata_port_probe(struct ata_port *ap)
1445 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1449 * sata_print_link_status - Print SATA link status
1450 * @ap: SATA port to printk link status about
1452 * This function prints link speed and status of a SATA link.
1457 static void sata_print_link_status(struct ata_port *ap)
1462 if (!ap->ops->scr_read)
1465 sstatus = scr_read(ap, SCR_STATUS);
1467 if (sata_dev_present(ap)) {
1468 tmp = (sstatus >> 4) & 0xf;
1471 else if (tmp & (1 << 1))
1474 speed = "<unknown>";
1475 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1476 ap->id, speed, sstatus);
1478 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1484 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1485 * @ap: SATA port associated with target SATA PHY.
1487 * This function issues commands to standard SATA Sxxx
1488 * PHY registers, to wake up the phy (and device), and
1489 * clear any reset condition.
1492 * PCI/etc. bus probe sem.
1495 void __sata_phy_reset(struct ata_port *ap)
1498 unsigned long timeout = jiffies + (HZ * 5);
1500 if (ap->flags & ATA_FLAG_SATA_RESET) {
1501 /* issue phy wake/reset */
1502 scr_write_flush(ap, SCR_CONTROL, 0x301);
1503 /* Couldn't find anything in SATA I/II specs, but
1504 * AHCI-1.1 10.4.2 says at least 1 ms. */
1507 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1509 /* wait for phy to become ready, if necessary */
1512 sstatus = scr_read(ap, SCR_STATUS);
1513 if ((sstatus & 0xf) != 1)
1515 } while (time_before(jiffies, timeout));
1517 /* print link status */
1518 sata_print_link_status(ap);
1520 /* TODO: phy layer with polling, timeouts, etc. */
1521 if (sata_dev_present(ap))
1524 ata_port_disable(ap);
1526 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1529 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1530 ata_port_disable(ap);
1534 ap->cbl = ATA_CBL_SATA;
1538 * sata_phy_reset - Reset SATA bus.
1539 * @ap: SATA port associated with target SATA PHY.
1541 * This function resets the SATA bus, and then probes
1542 * the bus for devices.
1545 * PCI/etc. bus probe sem.
1548 void sata_phy_reset(struct ata_port *ap)
1550 __sata_phy_reset(ap);
1551 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1557 * ata_dev_pair - return other device on cable
1561 * Obtain the other device on the same cable, or if none is
1562 * present NULL is returned
1565 struct ata_device *ata_dev_pair(struct ata_port *ap, struct ata_device *adev)
1567 struct ata_device *pair = &ap->device[1 - adev->devno];
1568 if (!ata_dev_present(pair))
1574 * ata_port_disable - Disable port.
1575 * @ap: Port to be disabled.
1577 * Modify @ap data structure such that the system
1578 * thinks that the entire port is disabled, and should
1579 * never attempt to probe or communicate with devices
1582 * LOCKING: host_set lock, or some other form of
1586 void ata_port_disable(struct ata_port *ap)
1588 ap->device[0].class = ATA_DEV_NONE;
1589 ap->device[1].class = ATA_DEV_NONE;
1590 ap->flags |= ATA_FLAG_PORT_DISABLED;
1594 * This mode timing computation functionality is ported over from
1595 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1598 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1599 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1600 * for PIO 5, which is a nonstandard extension and UDMA6, which
1601 * is currently supported only by Maxtor drives.
1604 static const struct ata_timing ata_timing[] = {
1606 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1607 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1608 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1609 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1611 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1612 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1613 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1615 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1617 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1618 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1619 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1621 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1622 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1623 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1625 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1626 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1627 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1629 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1630 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1631 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1633 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1638 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1639 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1641 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1643 q->setup = EZ(t->setup * 1000, T);
1644 q->act8b = EZ(t->act8b * 1000, T);
1645 q->rec8b = EZ(t->rec8b * 1000, T);
1646 q->cyc8b = EZ(t->cyc8b * 1000, T);
1647 q->active = EZ(t->active * 1000, T);
1648 q->recover = EZ(t->recover * 1000, T);
1649 q->cycle = EZ(t->cycle * 1000, T);
1650 q->udma = EZ(t->udma * 1000, UT);
1653 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1654 struct ata_timing *m, unsigned int what)
1656 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1657 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1658 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1659 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1660 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1661 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1662 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1663 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1666 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1668 const struct ata_timing *t;
1670 for (t = ata_timing; t->mode != speed; t++)
1671 if (t->mode == 0xFF)
1676 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1677 struct ata_timing *t, int T, int UT)
1679 const struct ata_timing *s;
1680 struct ata_timing p;
1686 if (!(s = ata_timing_find_mode(speed)))
1689 memcpy(t, s, sizeof(*s));
1692 * If the drive is an EIDE drive, it can tell us it needs extended
1693 * PIO/MW_DMA cycle timing.
1696 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1697 memset(&p, 0, sizeof(p));
1698 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1699 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1700 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1701 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1702 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1704 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1708 * Convert the timing to bus clock counts.
1711 ata_timing_quantize(t, t, T, UT);
1714 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1715 * S.M.A.R.T * and some other commands. We have to ensure that the
1716 * DMA cycle timing is slower/equal than the fastest PIO timing.
1719 if (speed > XFER_PIO_4) {
1720 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1721 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1725 * Lengthen active & recovery time so that cycle time is correct.
1728 if (t->act8b + t->rec8b < t->cyc8b) {
1729 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1730 t->rec8b = t->cyc8b - t->act8b;
1733 if (t->active + t->recover < t->cycle) {
1734 t->active += (t->cycle - (t->active + t->recover)) / 2;
1735 t->recover = t->cycle - t->active;
1741 static int ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1743 unsigned int err_mask;
1746 if (dev->xfer_shift == ATA_SHIFT_PIO)
1747 dev->flags |= ATA_DFLAG_PIO;
1749 err_mask = ata_dev_set_xfermode(ap, dev);
1752 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1757 rc = ata_dev_revalidate(ap, dev, 0);
1760 "ata%u: failed to revalidate after set xfermode\n",
1765 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1766 dev->xfer_shift, (int)dev->xfer_mode);
1768 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1770 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1774 static int ata_host_set_pio(struct ata_port *ap)
1778 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1779 struct ata_device *dev = &ap->device[i];
1781 if (!ata_dev_present(dev))
1784 if (!dev->pio_mode) {
1785 printk(KERN_WARNING "ata%u: no PIO support for device %d.\n", ap->id, i);
1789 dev->xfer_mode = dev->pio_mode;
1790 dev->xfer_shift = ATA_SHIFT_PIO;
1791 if (ap->ops->set_piomode)
1792 ap->ops->set_piomode(ap, dev);
1798 static void ata_host_set_dma(struct ata_port *ap)
1802 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1803 struct ata_device *dev = &ap->device[i];
1805 if (!ata_dev_present(dev) || !dev->dma_mode)
1808 dev->xfer_mode = dev->dma_mode;
1809 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
1810 if (ap->ops->set_dmamode)
1811 ap->ops->set_dmamode(ap, dev);
1816 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1817 * @ap: port on which timings will be programmed
1819 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1822 * PCI/etc. bus probe sem.
1824 static void ata_set_mode(struct ata_port *ap)
1828 /* step 1: calculate xfer_mask */
1829 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1830 struct ata_device *dev = &ap->device[i];
1831 unsigned int pio_mask, dma_mask;
1833 if (!ata_dev_present(dev))
1836 ata_dev_xfermask(ap, dev);
1838 /* TODO: let LLDD filter dev->*_mask here */
1840 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
1841 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
1842 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
1843 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
1846 /* step 2: always set host PIO timings */
1847 rc = ata_host_set_pio(ap);
1851 /* step 3: set host DMA timings */
1852 ata_host_set_dma(ap);
1854 /* step 4: update devices' xfer mode */
1855 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1856 struct ata_device *dev = &ap->device[i];
1858 if (!ata_dev_present(dev))
1861 if (ata_dev_set_mode(ap, dev))
1865 if (ap->ops->post_set_mode)
1866 ap->ops->post_set_mode(ap);
1871 ata_port_disable(ap);
1875 * ata_tf_to_host - issue ATA taskfile to host controller
1876 * @ap: port to which command is being issued
1877 * @tf: ATA taskfile register set
1879 * Issues ATA taskfile register set to ATA host controller,
1880 * with proper synchronization with interrupt handler and
1884 * spin_lock_irqsave(host_set lock)
1887 static inline void ata_tf_to_host(struct ata_port *ap,
1888 const struct ata_taskfile *tf)
1890 ap->ops->tf_load(ap, tf);
1891 ap->ops->exec_command(ap, tf);
1895 * ata_busy_sleep - sleep until BSY clears, or timeout
1896 * @ap: port containing status register to be polled
1897 * @tmout_pat: impatience timeout
1898 * @tmout: overall timeout
1900 * Sleep until ATA Status register bit BSY clears,
1901 * or a timeout occurs.
1906 unsigned int ata_busy_sleep (struct ata_port *ap,
1907 unsigned long tmout_pat, unsigned long tmout)
1909 unsigned long timer_start, timeout;
1912 status = ata_busy_wait(ap, ATA_BUSY, 300);
1913 timer_start = jiffies;
1914 timeout = timer_start + tmout_pat;
1915 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1917 status = ata_busy_wait(ap, ATA_BUSY, 3);
1920 if (status & ATA_BUSY)
1921 printk(KERN_WARNING "ata%u is slow to respond, "
1922 "please be patient\n", ap->id);
1924 timeout = timer_start + tmout;
1925 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1927 status = ata_chk_status(ap);
1930 if (status & ATA_BUSY) {
1931 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1932 ap->id, tmout / HZ);
1939 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1941 struct ata_ioports *ioaddr = &ap->ioaddr;
1942 unsigned int dev0 = devmask & (1 << 0);
1943 unsigned int dev1 = devmask & (1 << 1);
1944 unsigned long timeout;
1946 /* if device 0 was found in ata_devchk, wait for its
1950 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1952 /* if device 1 was found in ata_devchk, wait for
1953 * register access, then wait for BSY to clear
1955 timeout = jiffies + ATA_TMOUT_BOOT;
1959 ap->ops->dev_select(ap, 1);
1960 if (ap->flags & ATA_FLAG_MMIO) {
1961 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1962 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1964 nsect = inb(ioaddr->nsect_addr);
1965 lbal = inb(ioaddr->lbal_addr);
1967 if ((nsect == 1) && (lbal == 1))
1969 if (time_after(jiffies, timeout)) {
1973 msleep(50); /* give drive a breather */
1976 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1978 /* is all this really necessary? */
1979 ap->ops->dev_select(ap, 0);
1981 ap->ops->dev_select(ap, 1);
1983 ap->ops->dev_select(ap, 0);
1986 static unsigned int ata_bus_softreset(struct ata_port *ap,
1987 unsigned int devmask)
1989 struct ata_ioports *ioaddr = &ap->ioaddr;
1991 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
1993 /* software reset. causes dev0 to be selected */
1994 if (ap->flags & ATA_FLAG_MMIO) {
1995 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1996 udelay(20); /* FIXME: flush */
1997 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
1998 udelay(20); /* FIXME: flush */
1999 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2001 outb(ap->ctl, ioaddr->ctl_addr);
2003 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2005 outb(ap->ctl, ioaddr->ctl_addr);
2008 /* spec mandates ">= 2ms" before checking status.
2009 * We wait 150ms, because that was the magic delay used for
2010 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2011 * between when the ATA command register is written, and then
2012 * status is checked. Because waiting for "a while" before
2013 * checking status is fine, post SRST, we perform this magic
2014 * delay here as well.
2016 * Old drivers/ide uses the 2mS rule and then waits for ready
2021 /* Before we perform post reset processing we want to see if
2022 the bus shows 0xFF because the odd clown forgets the D7 pulldown
2025 if (ata_check_status(ap) == 0xFF)
2026 return 1; /* Positive is failure for some reason */
2028 ata_bus_post_reset(ap, devmask);
2034 * ata_bus_reset - reset host port and associated ATA channel
2035 * @ap: port to reset
2037 * This is typically the first time we actually start issuing
2038 * commands to the ATA channel. We wait for BSY to clear, then
2039 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2040 * result. Determine what devices, if any, are on the channel
2041 * by looking at the device 0/1 error register. Look at the signature
2042 * stored in each device's taskfile registers, to determine if
2043 * the device is ATA or ATAPI.
2046 * PCI/etc. bus probe sem.
2047 * Obtains host_set lock.
2050 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2053 void ata_bus_reset(struct ata_port *ap)
2055 struct ata_ioports *ioaddr = &ap->ioaddr;
2056 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2058 unsigned int dev0, dev1 = 0, devmask = 0;
2060 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2062 /* determine if device 0/1 are present */
2063 if (ap->flags & ATA_FLAG_SATA_RESET)
2066 dev0 = ata_devchk(ap, 0);
2068 dev1 = ata_devchk(ap, 1);
2072 devmask |= (1 << 0);
2074 devmask |= (1 << 1);
2076 /* select device 0 again */
2077 ap->ops->dev_select(ap, 0);
2079 /* issue bus reset */
2080 if (ap->flags & ATA_FLAG_SRST)
2081 if (ata_bus_softreset(ap, devmask))
2085 * determine by signature whether we have ATA or ATAPI devices
2087 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2088 if ((slave_possible) && (err != 0x81))
2089 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2091 /* re-enable interrupts */
2092 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2095 /* is double-select really necessary? */
2096 if (ap->device[1].class != ATA_DEV_NONE)
2097 ap->ops->dev_select(ap, 1);
2098 if (ap->device[0].class != ATA_DEV_NONE)
2099 ap->ops->dev_select(ap, 0);
2101 /* if no devices were detected, disable this port */
2102 if ((ap->device[0].class == ATA_DEV_NONE) &&
2103 (ap->device[1].class == ATA_DEV_NONE))
2106 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2107 /* set up device control for ATA_FLAG_SATA_RESET */
2108 if (ap->flags & ATA_FLAG_MMIO)
2109 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2111 outb(ap->ctl, ioaddr->ctl_addr);
2118 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2119 ap->ops->port_disable(ap);
2124 static int sata_phy_resume(struct ata_port *ap)
2126 unsigned long timeout = jiffies + (HZ * 5);
2129 scr_write_flush(ap, SCR_CONTROL, 0x300);
2131 /* Wait for phy to become ready, if necessary. */
2134 sstatus = scr_read(ap, SCR_STATUS);
2135 if ((sstatus & 0xf) != 1)
2137 } while (time_before(jiffies, timeout));
2143 * ata_std_probeinit - initialize probing
2144 * @ap: port to be probed
2146 * @ap is about to be probed. Initialize it. This function is
2147 * to be used as standard callback for ata_drive_probe_reset().
2149 * NOTE!!! Do not use this function as probeinit if a low level
2150 * driver implements only hardreset. Just pass NULL as probeinit
2151 * in that case. Using this function is probably okay but doing
2152 * so makes reset sequence different from the original
2153 * ->phy_reset implementation and Jeff nervous. :-P
2155 extern void ata_std_probeinit(struct ata_port *ap)
2157 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
2158 sata_phy_resume(ap);
2159 if (sata_dev_present(ap))
2160 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2165 * ata_std_softreset - reset host port via ATA SRST
2166 * @ap: port to reset
2167 * @verbose: fail verbosely
2168 * @classes: resulting classes of attached devices
2170 * Reset host port using ATA SRST. This function is to be used
2171 * as standard callback for ata_drive_*_reset() functions.
2174 * Kernel thread context (may sleep)
2177 * 0 on success, -errno otherwise.
2179 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2181 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2182 unsigned int devmask = 0, err_mask;
2187 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2188 classes[0] = ATA_DEV_NONE;
2192 /* determine if device 0/1 are present */
2193 if (ata_devchk(ap, 0))
2194 devmask |= (1 << 0);
2195 if (slave_possible && ata_devchk(ap, 1))
2196 devmask |= (1 << 1);
2198 /* select device 0 again */
2199 ap->ops->dev_select(ap, 0);
2201 /* issue bus reset */
2202 DPRINTK("about to softreset, devmask=%x\n", devmask);
2203 err_mask = ata_bus_softreset(ap, devmask);
2206 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2209 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2214 /* determine by signature whether we have ATA or ATAPI devices */
2215 classes[0] = ata_dev_try_classify(ap, 0, &err);
2216 if (slave_possible && err != 0x81)
2217 classes[1] = ata_dev_try_classify(ap, 1, &err);
2220 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2225 * sata_std_hardreset - reset host port via SATA phy reset
2226 * @ap: port to reset
2227 * @verbose: fail verbosely
2228 * @class: resulting class of attached device
2230 * SATA phy-reset host port using DET bits of SControl register.
2231 * This function is to be used as standard callback for
2232 * ata_drive_*_reset().
2235 * Kernel thread context (may sleep)
2238 * 0 on success, -errno otherwise.
2240 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2244 /* Issue phy wake/reset */
2245 scr_write_flush(ap, SCR_CONTROL, 0x301);
2248 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2249 * 10.4.2 says at least 1 ms.
2253 /* Bring phy back */
2254 sata_phy_resume(ap);
2256 /* TODO: phy layer with polling, timeouts, etc. */
2257 if (!sata_dev_present(ap)) {
2258 *class = ATA_DEV_NONE;
2259 DPRINTK("EXIT, link offline\n");
2263 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2265 printk(KERN_ERR "ata%u: COMRESET failed "
2266 "(device not ready)\n", ap->id);
2268 DPRINTK("EXIT, device not ready\n");
2272 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2274 *class = ata_dev_try_classify(ap, 0, NULL);
2276 DPRINTK("EXIT, class=%u\n", *class);
2281 * ata_std_postreset - standard postreset callback
2282 * @ap: the target ata_port
2283 * @classes: classes of attached devices
2285 * This function is invoked after a successful reset. Note that
2286 * the device might have been reset more than once using
2287 * different reset methods before postreset is invoked.
2289 * This function is to be used as standard callback for
2290 * ata_drive_*_reset().
2293 * Kernel thread context (may sleep)
2295 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2299 /* set cable type if it isn't already set */
2300 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2301 ap->cbl = ATA_CBL_SATA;
2303 /* print link status */
2304 if (ap->cbl == ATA_CBL_SATA)
2305 sata_print_link_status(ap);
2307 /* re-enable interrupts */
2308 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2311 /* is double-select really necessary? */
2312 if (classes[0] != ATA_DEV_NONE)
2313 ap->ops->dev_select(ap, 1);
2314 if (classes[1] != ATA_DEV_NONE)
2315 ap->ops->dev_select(ap, 0);
2317 /* bail out if no device is present */
2318 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2319 DPRINTK("EXIT, no device\n");
2323 /* set up device control */
2324 if (ap->ioaddr.ctl_addr) {
2325 if (ap->flags & ATA_FLAG_MMIO)
2326 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2328 outb(ap->ctl, ap->ioaddr.ctl_addr);
2335 * ata_std_probe_reset - standard probe reset method
2336 * @ap: prot to perform probe-reset
2337 * @classes: resulting classes of attached devices
2339 * The stock off-the-shelf ->probe_reset method.
2342 * Kernel thread context (may sleep)
2345 * 0 on success, -errno otherwise.
2347 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2349 ata_reset_fn_t hardreset;
2352 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2353 hardreset = sata_std_hardreset;
2355 return ata_drive_probe_reset(ap, ata_std_probeinit,
2356 ata_std_softreset, hardreset,
2357 ata_std_postreset, classes);
2360 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2361 ata_postreset_fn_t postreset,
2362 unsigned int *classes)
2366 for (i = 0; i < ATA_MAX_DEVICES; i++)
2367 classes[i] = ATA_DEV_UNKNOWN;
2369 rc = reset(ap, 0, classes);
2373 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2374 * is complete and convert all ATA_DEV_UNKNOWN to
2377 for (i = 0; i < ATA_MAX_DEVICES; i++)
2378 if (classes[i] != ATA_DEV_UNKNOWN)
2381 if (i < ATA_MAX_DEVICES)
2382 for (i = 0; i < ATA_MAX_DEVICES; i++)
2383 if (classes[i] == ATA_DEV_UNKNOWN)
2384 classes[i] = ATA_DEV_NONE;
2387 postreset(ap, classes);
2389 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2393 * ata_drive_probe_reset - Perform probe reset with given methods
2394 * @ap: port to reset
2395 * @probeinit: probeinit method (can be NULL)
2396 * @softreset: softreset method (can be NULL)
2397 * @hardreset: hardreset method (can be NULL)
2398 * @postreset: postreset method (can be NULL)
2399 * @classes: resulting classes of attached devices
2401 * Reset the specified port and classify attached devices using
2402 * given methods. This function prefers softreset but tries all
2403 * possible reset sequences to reset and classify devices. This
2404 * function is intended to be used for constructing ->probe_reset
2405 * callback by low level drivers.
2407 * Reset methods should follow the following rules.
2409 * - Return 0 on sucess, -errno on failure.
2410 * - If classification is supported, fill classes[] with
2411 * recognized class codes.
2412 * - If classification is not supported, leave classes[] alone.
2413 * - If verbose is non-zero, print error message on failure;
2414 * otherwise, shut up.
2417 * Kernel thread context (may sleep)
2420 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2421 * if classification fails, and any error code from reset
2424 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2425 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2426 ata_postreset_fn_t postreset, unsigned int *classes)
2434 rc = do_probe_reset(ap, softreset, postreset, classes);
2442 rc = do_probe_reset(ap, hardreset, postreset, classes);
2443 if (rc == 0 || rc != -ENODEV)
2447 rc = do_probe_reset(ap, softreset, postreset, classes);
2453 * ata_dev_same_device - Determine whether new ID matches configured device
2454 * @ap: port on which the device to compare against resides
2455 * @dev: device to compare against
2456 * @new_class: class of the new device
2457 * @new_id: IDENTIFY page of the new device
2459 * Compare @new_class and @new_id against @dev and determine
2460 * whether @dev is the device indicated by @new_class and
2467 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2469 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2470 unsigned int new_class, const u16 *new_id)
2472 const u16 *old_id = dev->id;
2473 unsigned char model[2][41], serial[2][21];
2476 if (dev->class != new_class) {
2478 "ata%u: dev %u class mismatch %d != %d\n",
2479 ap->id, dev->devno, dev->class, new_class);
2483 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2484 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2485 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2486 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2487 new_n_sectors = ata_id_n_sectors(new_id);
2489 if (strcmp(model[0], model[1])) {
2491 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2492 ap->id, dev->devno, model[0], model[1]);
2496 if (strcmp(serial[0], serial[1])) {
2498 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2499 ap->id, dev->devno, serial[0], serial[1]);
2503 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2505 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2506 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2507 (unsigned long long)new_n_sectors);
2515 * ata_dev_revalidate - Revalidate ATA device
2516 * @ap: port on which the device to revalidate resides
2517 * @dev: device to revalidate
2518 * @post_reset: is this revalidation after reset?
2520 * Re-read IDENTIFY page and make sure @dev is still attached to
2524 * Kernel thread context (may sleep)
2527 * 0 on success, negative errno otherwise
2529 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2536 if (!ata_dev_present(dev))
2542 /* allocate & read ID data */
2543 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2547 /* is the device still there? */
2548 if (!ata_dev_same_device(ap, dev, class, id)) {
2556 /* configure device according to the new ID */
2557 return ata_dev_configure(ap, dev, 0);
2560 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2561 ap->id, dev->devno, rc);
2566 static const char * const ata_dma_blacklist [] = {
2567 "WDC AC11000H", NULL,
2568 "WDC AC22100H", NULL,
2569 "WDC AC32500H", NULL,
2570 "WDC AC33100H", NULL,
2571 "WDC AC31600H", NULL,
2572 "WDC AC32100H", "24.09P07",
2573 "WDC AC23200L", "21.10N21",
2574 "Compaq CRD-8241B", NULL,
2579 "SanDisk SDP3B", NULL,
2580 "SanDisk SDP3B-64", NULL,
2581 "SANYO CD-ROM CRD", NULL,
2582 "HITACHI CDR-8", NULL,
2583 "HITACHI CDR-8335", NULL,
2584 "HITACHI CDR-8435", NULL,
2585 "Toshiba CD-ROM XM-6202B", NULL,
2586 "TOSHIBA CD-ROM XM-1702BC", NULL,
2588 "E-IDE CD-ROM CR-840", NULL,
2589 "CD-ROM Drive/F5A", NULL,
2590 "WPI CDD-820", NULL,
2591 "SAMSUNG CD-ROM SC-148C", NULL,
2592 "SAMSUNG CD-ROM SC", NULL,
2593 "SanDisk SDP3B-64", NULL,
2594 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2595 "_NEC DV5800A", NULL,
2596 "SAMSUNG CD-ROM SN-124", "N001"
2599 static int ata_strim(char *s, size_t len)
2601 len = strnlen(s, len);
2603 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2604 while ((len > 0) && (s[len - 1] == ' ')) {
2611 static int ata_dma_blacklisted(const struct ata_device *dev)
2613 unsigned char model_num[40];
2614 unsigned char model_rev[16];
2615 unsigned int nlen, rlen;
2618 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2620 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2622 nlen = ata_strim(model_num, sizeof(model_num));
2623 rlen = ata_strim(model_rev, sizeof(model_rev));
2625 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2626 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2627 if (ata_dma_blacklist[i+1] == NULL)
2629 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2637 * ata_dev_xfermask - Compute supported xfermask of the given device
2638 * @ap: Port on which the device to compute xfermask for resides
2639 * @dev: Device to compute xfermask for
2641 * Compute supported xfermask of @dev and store it in
2642 * dev->*_mask. This function is responsible for applying all
2643 * known limits including host controller limits, device
2649 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
2651 unsigned long xfer_mask;
2654 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
2657 /* use port-wide xfermask for now */
2658 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2659 struct ata_device *d = &ap->device[i];
2660 if (!ata_dev_present(d))
2662 xfer_mask &= ata_pack_xfermask(d->pio_mask, d->mwdma_mask,
2664 xfer_mask &= ata_id_xfermask(d->id);
2665 if (ata_dma_blacklisted(d))
2666 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2669 if (ata_dma_blacklisted(dev))
2670 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2671 "disabling DMA\n", ap->id, dev->devno);
2673 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2678 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2679 * @ap: Port associated with device @dev
2680 * @dev: Device to which command will be sent
2682 * Issue SET FEATURES - XFER MODE command to device @dev
2686 * PCI/etc. bus probe sem.
2689 * 0 on success, AC_ERR_* mask otherwise.
2692 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
2693 struct ata_device *dev)
2695 struct ata_taskfile tf;
2696 unsigned int err_mask;
2698 /* set up set-features taskfile */
2699 DPRINTK("set features - xfer mode\n");
2701 ata_tf_init(ap, &tf, dev->devno);
2702 tf.command = ATA_CMD_SET_FEATURES;
2703 tf.feature = SETFEATURES_XFER;
2704 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2705 tf.protocol = ATA_PROT_NODATA;
2706 tf.nsect = dev->xfer_mode;
2708 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2710 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2715 * ata_dev_init_params - Issue INIT DEV PARAMS command
2716 * @ap: Port associated with device @dev
2717 * @dev: Device to which command will be sent
2720 * Kernel thread context (may sleep)
2723 * 0 on success, AC_ERR_* mask otherwise.
2726 static unsigned int ata_dev_init_params(struct ata_port *ap,
2727 struct ata_device *dev)
2729 struct ata_taskfile tf;
2730 unsigned int err_mask;
2731 u16 sectors = dev->id[6];
2732 u16 heads = dev->id[3];
2734 /* Number of sectors per track 1-255. Number of heads 1-16 */
2735 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2738 /* set up init dev params taskfile */
2739 DPRINTK("init dev params \n");
2741 ata_tf_init(ap, &tf, dev->devno);
2742 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2743 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2744 tf.protocol = ATA_PROT_NODATA;
2746 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2748 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2750 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2755 * ata_sg_clean - Unmap DMA memory associated with command
2756 * @qc: Command containing DMA memory to be released
2758 * Unmap all mapped DMA memory associated with this command.
2761 * spin_lock_irqsave(host_set lock)
2764 static void ata_sg_clean(struct ata_queued_cmd *qc)
2766 struct ata_port *ap = qc->ap;
2767 struct scatterlist *sg = qc->__sg;
2768 int dir = qc->dma_dir;
2769 void *pad_buf = NULL;
2771 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2772 WARN_ON(sg == NULL);
2774 if (qc->flags & ATA_QCFLAG_SINGLE)
2775 WARN_ON(qc->n_elem > 1);
2777 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2779 /* if we padded the buffer out to 32-bit bound, and data
2780 * xfer direction is from-device, we must copy from the
2781 * pad buffer back into the supplied buffer
2783 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2784 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2786 if (qc->flags & ATA_QCFLAG_SG) {
2788 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
2789 /* restore last sg */
2790 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2792 struct scatterlist *psg = &qc->pad_sgent;
2793 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2794 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2795 kunmap_atomic(addr, KM_IRQ0);
2799 dma_unmap_single(ap->dev,
2800 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2803 sg->length += qc->pad_len;
2805 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2806 pad_buf, qc->pad_len);
2809 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2814 * ata_fill_sg - Fill PCI IDE PRD table
2815 * @qc: Metadata associated with taskfile to be transferred
2817 * Fill PCI IDE PRD (scatter-gather) table with segments
2818 * associated with the current disk command.
2821 * spin_lock_irqsave(host_set lock)
2824 static void ata_fill_sg(struct ata_queued_cmd *qc)
2826 struct ata_port *ap = qc->ap;
2827 struct scatterlist *sg;
2830 WARN_ON(qc->__sg == NULL);
2831 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2834 ata_for_each_sg(sg, qc) {
2838 /* determine if physical DMA addr spans 64K boundary.
2839 * Note h/w doesn't support 64-bit, so we unconditionally
2840 * truncate dma_addr_t to u32.
2842 addr = (u32) sg_dma_address(sg);
2843 sg_len = sg_dma_len(sg);
2846 offset = addr & 0xffff;
2848 if ((offset + sg_len) > 0x10000)
2849 len = 0x10000 - offset;
2851 ap->prd[idx].addr = cpu_to_le32(addr);
2852 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2853 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2862 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2865 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2866 * @qc: Metadata associated with taskfile to check
2868 * Allow low-level driver to filter ATA PACKET commands, returning
2869 * a status indicating whether or not it is OK to use DMA for the
2870 * supplied PACKET command.
2873 * spin_lock_irqsave(host_set lock)
2875 * RETURNS: 0 when ATAPI DMA can be used
2878 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2880 struct ata_port *ap = qc->ap;
2881 int rc = 0; /* Assume ATAPI DMA is OK by default */
2883 if (ap->ops->check_atapi_dma)
2884 rc = ap->ops->check_atapi_dma(qc);
2886 /* We don't support polling DMA.
2887 * Use PIO if the LLDD handles only interrupts in
2888 * the HSM_ST_LAST state and the ATAPI device
2889 * generates CDB interrupts.
2891 if ((ap->flags & ATA_FLAG_PIO_POLLING) &&
2892 (qc->dev->flags & ATA_DFLAG_CDB_INTR))
2898 * ata_qc_prep - Prepare taskfile for submission
2899 * @qc: Metadata associated with taskfile to be prepared
2901 * Prepare ATA taskfile for submission.
2904 * spin_lock_irqsave(host_set lock)
2906 void ata_qc_prep(struct ata_queued_cmd *qc)
2908 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2914 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
2917 * ata_sg_init_one - Associate command with memory buffer
2918 * @qc: Command to be associated
2919 * @buf: Memory buffer
2920 * @buflen: Length of memory buffer, in bytes.
2922 * Initialize the data-related elements of queued_cmd @qc
2923 * to point to a single memory buffer, @buf of byte length @buflen.
2926 * spin_lock_irqsave(host_set lock)
2929 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2931 struct scatterlist *sg;
2933 qc->flags |= ATA_QCFLAG_SINGLE;
2935 memset(&qc->sgent, 0, sizeof(qc->sgent));
2936 qc->__sg = &qc->sgent;
2938 qc->orig_n_elem = 1;
2942 sg_init_one(sg, buf, buflen);
2946 * ata_sg_init - Associate command with scatter-gather table.
2947 * @qc: Command to be associated
2948 * @sg: Scatter-gather table.
2949 * @n_elem: Number of elements in s/g table.
2951 * Initialize the data-related elements of queued_cmd @qc
2952 * to point to a scatter-gather table @sg, containing @n_elem
2956 * spin_lock_irqsave(host_set lock)
2959 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2960 unsigned int n_elem)
2962 qc->flags |= ATA_QCFLAG_SG;
2964 qc->n_elem = n_elem;
2965 qc->orig_n_elem = n_elem;
2969 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2970 * @qc: Command with memory buffer to be mapped.
2972 * DMA-map the memory buffer associated with queued_cmd @qc.
2975 * spin_lock_irqsave(host_set lock)
2978 * Zero on success, negative on error.
2981 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
2983 struct ata_port *ap = qc->ap;
2984 int dir = qc->dma_dir;
2985 struct scatterlist *sg = qc->__sg;
2986 dma_addr_t dma_address;
2989 /* we must lengthen transfers to end on a 32-bit boundary */
2990 qc->pad_len = sg->length & 3;
2992 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2993 struct scatterlist *psg = &qc->pad_sgent;
2995 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2997 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2999 if (qc->tf.flags & ATA_TFLAG_WRITE)
3000 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3003 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3004 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3006 sg->length -= qc->pad_len;
3007 if (sg->length == 0)
3010 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3011 sg->length, qc->pad_len);
3019 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3021 if (dma_mapping_error(dma_address)) {
3023 sg->length += qc->pad_len;
3027 sg_dma_address(sg) = dma_address;
3028 sg_dma_len(sg) = sg->length;
3031 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3032 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3038 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3039 * @qc: Command with scatter-gather table to be mapped.
3041 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3044 * spin_lock_irqsave(host_set lock)
3047 * Zero on success, negative on error.
3051 static int ata_sg_setup(struct ata_queued_cmd *qc)
3053 struct ata_port *ap = qc->ap;
3054 struct scatterlist *sg = qc->__sg;
3055 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3056 int n_elem, pre_n_elem, dir, trim_sg = 0;
3058 VPRINTK("ENTER, ata%u\n", ap->id);
3059 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3061 /* we must lengthen transfers to end on a 32-bit boundary */
3062 qc->pad_len = lsg->length & 3;
3064 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3065 struct scatterlist *psg = &qc->pad_sgent;
3066 unsigned int offset;
3068 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3070 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3073 * psg->page/offset are used to copy to-be-written
3074 * data in this function or read data in ata_sg_clean.
3076 offset = lsg->offset + lsg->length - qc->pad_len;
3077 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3078 psg->offset = offset_in_page(offset);
3080 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3081 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3082 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3083 kunmap_atomic(addr, KM_IRQ0);
3086 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3087 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3089 lsg->length -= qc->pad_len;
3090 if (lsg->length == 0)
3093 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3094 qc->n_elem - 1, lsg->length, qc->pad_len);
3097 pre_n_elem = qc->n_elem;
3098 if (trim_sg && pre_n_elem)
3107 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3109 /* restore last sg */
3110 lsg->length += qc->pad_len;
3114 DPRINTK("%d sg elements mapped\n", n_elem);
3117 qc->n_elem = n_elem;
3123 * ata_poll_qc_complete - turn irq back on and finish qc
3124 * @qc: Command to complete
3125 * @err_mask: ATA status register content
3128 * None. (grabs host lock)
3131 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3133 struct ata_port *ap = qc->ap;
3134 unsigned long flags;
3136 spin_lock_irqsave(&ap->host_set->lock, flags);
3138 ata_qc_complete(qc);
3139 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3143 * swap_buf_le16 - swap halves of 16-bit words in place
3144 * @buf: Buffer to swap
3145 * @buf_words: Number of 16-bit words in buffer.
3147 * Swap halves of 16-bit words if needed to convert from
3148 * little-endian byte order to native cpu byte order, or
3152 * Inherited from caller.
3154 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3159 for (i = 0; i < buf_words; i++)
3160 buf[i] = le16_to_cpu(buf[i]);
3161 #endif /* __BIG_ENDIAN */
3165 * ata_mmio_data_xfer - Transfer data by MMIO
3166 * @ap: port to read/write
3168 * @buflen: buffer length
3169 * @write_data: read/write
3171 * Transfer data from/to the device data register by MMIO.
3174 * Inherited from caller.
3177 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3178 unsigned int buflen, int write_data)
3181 unsigned int words = buflen >> 1;
3182 u16 *buf16 = (u16 *) buf;
3183 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3185 /* Transfer multiple of 2 bytes */
3187 for (i = 0; i < words; i++)
3188 writew(le16_to_cpu(buf16[i]), mmio);
3190 for (i = 0; i < words; i++)
3191 buf16[i] = cpu_to_le16(readw(mmio));
3194 /* Transfer trailing 1 byte, if any. */
3195 if (unlikely(buflen & 0x01)) {
3196 u16 align_buf[1] = { 0 };
3197 unsigned char *trailing_buf = buf + buflen - 1;
3200 memcpy(align_buf, trailing_buf, 1);
3201 writew(le16_to_cpu(align_buf[0]), mmio);
3203 align_buf[0] = cpu_to_le16(readw(mmio));
3204 memcpy(trailing_buf, align_buf, 1);
3210 * ata_pio_data_xfer - Transfer data by PIO
3211 * @ap: port to read/write
3213 * @buflen: buffer length
3214 * @write_data: read/write
3216 * Transfer data from/to the device data register by PIO.
3219 * Inherited from caller.
3222 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3223 unsigned int buflen, int write_data)
3225 unsigned int words = buflen >> 1;
3227 /* Transfer multiple of 2 bytes */
3229 outsw(ap->ioaddr.data_addr, buf, words);
3231 insw(ap->ioaddr.data_addr, buf, words);
3233 /* Transfer trailing 1 byte, if any. */
3234 if (unlikely(buflen & 0x01)) {
3235 u16 align_buf[1] = { 0 };
3236 unsigned char *trailing_buf = buf + buflen - 1;
3239 memcpy(align_buf, trailing_buf, 1);
3240 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3242 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3243 memcpy(trailing_buf, align_buf, 1);
3249 * ata_data_xfer - Transfer data from/to the data register.
3250 * @ap: port to read/write
3252 * @buflen: buffer length
3253 * @do_write: read/write
3255 * Transfer data from/to the device data register.
3258 * Inherited from caller.
3261 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3262 unsigned int buflen, int do_write)
3264 /* Make the crap hardware pay the costs not the good stuff */
3265 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3266 unsigned long flags;
3267 local_irq_save(flags);
3268 if (ap->flags & ATA_FLAG_MMIO)
3269 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3271 ata_pio_data_xfer(ap, buf, buflen, do_write);
3272 local_irq_restore(flags);
3274 if (ap->flags & ATA_FLAG_MMIO)
3275 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3277 ata_pio_data_xfer(ap, buf, buflen, do_write);
3282 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3283 * @qc: Command on going
3285 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3288 * Inherited from caller.
3291 static void ata_pio_sector(struct ata_queued_cmd *qc)
3293 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3294 struct scatterlist *sg = qc->__sg;
3295 struct ata_port *ap = qc->ap;
3297 unsigned int offset;
3300 if (qc->cursect == (qc->nsect - 1))
3301 ap->hsm_task_state = HSM_ST_LAST;
3303 page = sg[qc->cursg].page;
3304 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3306 /* get the current page and offset */
3307 page = nth_page(page, (offset >> PAGE_SHIFT));
3308 offset %= PAGE_SIZE;
3310 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3312 if (PageHighMem(page)) {
3313 unsigned long flags;
3315 local_irq_save(flags);
3316 buf = kmap_atomic(page, KM_IRQ0);
3318 /* do the actual data transfer */
3319 ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
3321 kunmap_atomic(buf, KM_IRQ0);
3322 local_irq_restore(flags);
3324 buf = page_address(page);
3325 ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
3331 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3338 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3339 * @qc: Command on going
3341 * Transfer one or many ATA_SECT_SIZE of data from/to the
3342 * ATA device for the DRQ request.
3345 * Inherited from caller.
3348 static void ata_pio_sectors(struct ata_queued_cmd *qc)
3350 if (is_multi_taskfile(&qc->tf)) {
3351 /* READ/WRITE MULTIPLE */
3354 WARN_ON(qc->dev->multi_count == 0);
3356 nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
3364 * atapi_send_cdb - Write CDB bytes to hardware
3365 * @ap: Port to which ATAPI device is attached.
3366 * @qc: Taskfile currently active
3368 * When device has indicated its readiness to accept
3369 * a CDB, this function is called. Send the CDB.
3375 static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
3378 DPRINTK("send cdb\n");
3379 WARN_ON(qc->dev->cdb_len < 12);
3381 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3382 ata_altstatus(ap); /* flush */
3384 switch (qc->tf.protocol) {
3385 case ATA_PROT_ATAPI:
3386 ap->hsm_task_state = HSM_ST;
3388 case ATA_PROT_ATAPI_NODATA:
3389 ap->hsm_task_state = HSM_ST_LAST;
3391 case ATA_PROT_ATAPI_DMA:
3392 ap->hsm_task_state = HSM_ST_LAST;
3393 /* initiate bmdma */
3394 ap->ops->bmdma_start(qc);
3400 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3401 * @qc: Command on going
3402 * @bytes: number of bytes
3404 * Transfer Transfer data from/to the ATAPI device.
3407 * Inherited from caller.
3411 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3413 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3414 struct scatterlist *sg = qc->__sg;
3415 struct ata_port *ap = qc->ap;
3418 unsigned int offset, count;
3420 if (qc->curbytes + bytes >= qc->nbytes)
3421 ap->hsm_task_state = HSM_ST_LAST;
3424 if (unlikely(qc->cursg >= qc->n_elem)) {
3426 * The end of qc->sg is reached and the device expects
3427 * more data to transfer. In order not to overrun qc->sg
3428 * and fulfill length specified in the byte count register,
3429 * - for read case, discard trailing data from the device
3430 * - for write case, padding zero data to the device
3432 u16 pad_buf[1] = { 0 };
3433 unsigned int words = bytes >> 1;
3436 if (words) /* warning if bytes > 1 */
3437 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3440 for (i = 0; i < words; i++)
3441 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3443 ap->hsm_task_state = HSM_ST_LAST;
3447 sg = &qc->__sg[qc->cursg];
3450 offset = sg->offset + qc->cursg_ofs;
3452 /* get the current page and offset */
3453 page = nth_page(page, (offset >> PAGE_SHIFT));
3454 offset %= PAGE_SIZE;
3456 /* don't overrun current sg */
3457 count = min(sg->length - qc->cursg_ofs, bytes);
3459 /* don't cross page boundaries */
3460 count = min(count, (unsigned int)PAGE_SIZE - offset);
3462 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3464 if (PageHighMem(page)) {
3465 unsigned long flags;
3467 local_irq_save(flags);
3468 buf = kmap_atomic(page, KM_IRQ0);
3470 /* do the actual data transfer */
3471 ata_data_xfer(ap, buf + offset, count, do_write);
3473 kunmap_atomic(buf, KM_IRQ0);
3474 local_irq_restore(flags);
3476 buf = page_address(page);
3477 ata_data_xfer(ap, buf + offset, count, do_write);
3481 qc->curbytes += count;
3482 qc->cursg_ofs += count;
3484 if (qc->cursg_ofs == sg->length) {
3494 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3495 * @qc: Command on going
3497 * Transfer Transfer data from/to the ATAPI device.
3500 * Inherited from caller.
3503 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3505 struct ata_port *ap = qc->ap;
3506 struct ata_device *dev = qc->dev;
3507 unsigned int ireason, bc_lo, bc_hi, bytes;
3508 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3510 ap->ops->tf_read(ap, &qc->tf);
3511 ireason = qc->tf.nsect;
3512 bc_lo = qc->tf.lbam;
3513 bc_hi = qc->tf.lbah;
3514 bytes = (bc_hi << 8) | bc_lo;
3516 /* shall be cleared to zero, indicating xfer of data */
3517 if (ireason & (1 << 0))
3520 /* make sure transfer direction matches expected */
3521 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3522 if (do_write != i_write)
3525 VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);
3527 __atapi_pio_bytes(qc, bytes);
3532 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3533 ap->id, dev->devno);
3534 qc->err_mask |= AC_ERR_HSM;
3535 ap->hsm_task_state = HSM_ST_ERR;
3539 * ata_hsm_move - move the HSM to the next state.
3540 * @ap: the target ata_port
3542 * @status: current device status
3543 * @in_wq: 1 if called from workqueue, 0 otherwise
3546 * 1 when poll next status needed, 0 otherwise.
3549 static int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
3550 u8 status, int in_wq)
3552 unsigned long flags = 0;
3555 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
3557 /* Make sure ata_qc_issue_prot() does not throw things
3558 * like DMA polling into the workqueue. Notice that
3559 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
3561 WARN_ON(in_wq != ((qc->tf.flags & ATA_TFLAG_POLLING) ||
3562 (ap->hsm_task_state == HSM_ST_FIRST &&
3563 ((qc->tf.protocol == ATA_PROT_PIO &&
3564 (qc->tf.flags & ATA_TFLAG_WRITE)) ||
3565 (is_atapi_taskfile(&qc->tf) &&
3566 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))))));
3569 if (unlikely(status & (ATA_ERR | ATA_DF))) {
3570 qc->err_mask |= AC_ERR_DEV;
3571 ap->hsm_task_state = HSM_ST_ERR;
3575 switch (ap->hsm_task_state) {
3577 /* Send first data block or PACKET CDB */
3579 /* If polling, we will stay in the work queue after
3580 * sending the data. Otherwise, interrupt handler
3581 * takes over after sending the data.
3583 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
3585 /* check device status */
3586 if (unlikely((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ)) {
3587 /* Wrong status. Let EH handle this */
3588 qc->err_mask |= AC_ERR_HSM;
3589 ap->hsm_task_state = HSM_ST_ERR;
3593 /* Send the CDB (atapi) or the first data block (ata pio out).
3594 * During the state transition, interrupt handler shouldn't
3595 * be invoked before the data transfer is complete and
3596 * hsm_task_state is changed. Hence, the following locking.
3599 spin_lock_irqsave(&ap->host_set->lock, flags);
3601 if (qc->tf.protocol == ATA_PROT_PIO) {
3602 /* PIO data out protocol.
3603 * send first data block.
3606 /* ata_pio_sectors() might change the state
3607 * to HSM_ST_LAST. so, the state is changed here
3608 * before ata_pio_sectors().
3610 ap->hsm_task_state = HSM_ST;
3611 ata_pio_sectors(qc);
3612 ata_altstatus(ap); /* flush */
3615 atapi_send_cdb(ap, qc);
3618 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3620 /* if polling, ata_pio_task() handles the rest.
3621 * otherwise, interrupt handler takes over from here.
3626 /* complete command or read/write the data register */
3627 if (qc->tf.protocol == ATA_PROT_ATAPI) {
3628 /* ATAPI PIO protocol */
3629 if ((status & ATA_DRQ) == 0) {
3630 /* no more data to transfer */
3631 ap->hsm_task_state = HSM_ST_LAST;
3635 atapi_pio_bytes(qc);
3637 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
3638 /* bad ireason reported by device */
3642 /* ATA PIO protocol */
3643 if (unlikely((status & ATA_DRQ) == 0)) {
3644 /* handle BSY=0, DRQ=0 as error */
3645 qc->err_mask |= AC_ERR_HSM;
3646 ap->hsm_task_state = HSM_ST_ERR;
3650 ata_pio_sectors(qc);
3652 if (ap->hsm_task_state == HSM_ST_LAST &&
3653 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
3656 status = ata_chk_status(ap);
3661 ata_altstatus(ap); /* flush */
3666 if (unlikely(!ata_ok(status))) {
3667 qc->err_mask |= __ac_err_mask(status);
3668 ap->hsm_task_state = HSM_ST_ERR;
3672 /* no more data to transfer */
3673 DPRINTK("ata%u: command complete, drv_stat 0x%x\n",
3676 WARN_ON(qc->err_mask);
3678 ap->hsm_task_state = HSM_ST_IDLE;
3680 /* complete taskfile transaction */
3682 ata_poll_qc_complete(qc);
3684 ata_qc_complete(qc);
3690 if (qc->tf.command != ATA_CMD_PACKET)
3691 printk(KERN_ERR "ata%u: command error, drv_stat 0x%x\n",
3694 /* make sure qc->err_mask is available to
3695 * know what's wrong and recover
3697 WARN_ON(qc->err_mask == 0);
3699 ap->hsm_task_state = HSM_ST_IDLE;
3702 ata_poll_qc_complete(qc);
3704 ata_qc_complete(qc);
3716 static void ata_pio_task(void *_data)
3718 struct ata_port *ap = _data;
3719 struct ata_queued_cmd *qc;
3724 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
3726 qc = ata_qc_from_tag(ap, ap->active_tag);
3727 WARN_ON(qc == NULL);
3730 * This is purely heuristic. This is a fast path.
3731 * Sometimes when we enter, BSY will be cleared in
3732 * a chk-status or two. If not, the drive is probably seeking
3733 * or something. Snooze for a couple msecs, then
3734 * chk-status again. If still busy, queue delayed work.
3736 status = ata_busy_wait(ap, ATA_BUSY, 5);
3737 if (status & ATA_BUSY) {
3739 status = ata_busy_wait(ap, ATA_BUSY, 10);
3740 if (status & ATA_BUSY) {
3741 ata_port_queue_task(ap, ata_pio_task, ap, ATA_SHORT_PAUSE);
3747 poll_next = ata_hsm_move(ap, qc, status, 1);
3749 /* another command or interrupt handler
3750 * may be running at this point.
3757 * ata_qc_timeout - Handle timeout of queued command
3758 * @qc: Command that timed out
3760 * Some part of the kernel (currently, only the SCSI layer)
3761 * has noticed that the active command on port @ap has not
3762 * completed after a specified length of time. Handle this
3763 * condition by disabling DMA (if necessary) and completing
3764 * transactions, with error if necessary.
3766 * This also handles the case of the "lost interrupt", where
3767 * for some reason (possibly hardware bug, possibly driver bug)
3768 * an interrupt was not delivered to the driver, even though the
3769 * transaction completed successfully.
3772 * Inherited from SCSI layer (none, can sleep)
3775 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3777 struct ata_port *ap = qc->ap;
3778 struct ata_host_set *host_set = ap->host_set;
3779 u8 host_stat = 0, drv_stat;
3780 unsigned long flags;
3784 ap->hsm_task_state = HSM_ST_IDLE;
3786 spin_lock_irqsave(&host_set->lock, flags);
3788 switch (qc->tf.protocol) {
3791 case ATA_PROT_ATAPI_DMA:
3792 host_stat = ap->ops->bmdma_status(ap);
3794 /* before we do anything else, clear DMA-Start bit */
3795 ap->ops->bmdma_stop(qc);
3801 drv_stat = ata_chk_status(ap);
3803 /* ack bmdma irq events */
3804 ap->ops->irq_clear(ap);
3806 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3807 ap->id, qc->tf.command, drv_stat, host_stat);
3809 ap->hsm_task_state = HSM_ST_IDLE;
3811 /* complete taskfile transaction */
3812 qc->err_mask |= AC_ERR_TIMEOUT;
3816 spin_unlock_irqrestore(&host_set->lock, flags);
3818 ata_eh_qc_complete(qc);
3824 * ata_eng_timeout - Handle timeout of queued command
3825 * @ap: Port on which timed-out command is active
3827 * Some part of the kernel (currently, only the SCSI layer)
3828 * has noticed that the active command on port @ap has not
3829 * completed after a specified length of time. Handle this
3830 * condition by disabling DMA (if necessary) and completing
3831 * transactions, with error if necessary.
3833 * This also handles the case of the "lost interrupt", where
3834 * for some reason (possibly hardware bug, possibly driver bug)
3835 * an interrupt was not delivered to the driver, even though the
3836 * transaction completed successfully.
3839 * Inherited from SCSI layer (none, can sleep)
3842 void ata_eng_timeout(struct ata_port *ap)
3846 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3852 * ata_qc_new - Request an available ATA command, for queueing
3853 * @ap: Port associated with device @dev
3854 * @dev: Device from whom we request an available command structure
3860 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3862 struct ata_queued_cmd *qc = NULL;
3865 for (i = 0; i < ATA_MAX_QUEUE; i++)
3866 if (!test_and_set_bit(i, &ap->qactive)) {
3867 qc = ata_qc_from_tag(ap, i);
3878 * ata_qc_new_init - Request an available ATA command, and initialize it
3879 * @ap: Port associated with device @dev
3880 * @dev: Device from whom we request an available command structure
3886 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3887 struct ata_device *dev)
3889 struct ata_queued_cmd *qc;
3891 qc = ata_qc_new(ap);
3904 * ata_qc_free - free unused ata_queued_cmd
3905 * @qc: Command to complete
3907 * Designed to free unused ata_queued_cmd object
3908 * in case something prevents using it.
3911 * spin_lock_irqsave(host_set lock)
3913 void ata_qc_free(struct ata_queued_cmd *qc)
3915 struct ata_port *ap = qc->ap;
3918 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3922 if (likely(ata_tag_valid(tag))) {
3923 if (tag == ap->active_tag)
3924 ap->active_tag = ATA_TAG_POISON;
3925 qc->tag = ATA_TAG_POISON;
3926 clear_bit(tag, &ap->qactive);
3930 void __ata_qc_complete(struct ata_queued_cmd *qc)
3932 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3933 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3935 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3938 /* atapi: mark qc as inactive to prevent the interrupt handler
3939 * from completing the command twice later, before the error handler
3940 * is called. (when rc != 0 and atapi request sense is needed)
3942 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3944 /* call completion callback */
3945 qc->complete_fn(qc);
3948 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3950 struct ata_port *ap = qc->ap;
3952 switch (qc->tf.protocol) {
3954 case ATA_PROT_ATAPI_DMA:
3957 case ATA_PROT_ATAPI:
3959 if (ap->flags & ATA_FLAG_PIO_DMA)
3972 * ata_qc_issue - issue taskfile to device
3973 * @qc: command to issue to device
3975 * Prepare an ATA command to submission to device.
3976 * This includes mapping the data into a DMA-able
3977 * area, filling in the S/G table, and finally
3978 * writing the taskfile to hardware, starting the command.
3981 * spin_lock_irqsave(host_set lock)
3984 * Zero on success, AC_ERR_* mask on failure
3987 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
3989 struct ata_port *ap = qc->ap;
3991 if (ata_should_dma_map(qc)) {
3992 if (qc->flags & ATA_QCFLAG_SG) {
3993 if (ata_sg_setup(qc))
3995 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
3996 if (ata_sg_setup_one(qc))
4000 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4003 ap->ops->qc_prep(qc);
4005 qc->ap->active_tag = qc->tag;
4006 qc->flags |= ATA_QCFLAG_ACTIVE;
4008 return ap->ops->qc_issue(qc);
4011 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4012 return AC_ERR_SYSTEM;
4017 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4018 * @qc: command to issue to device
4020 * Using various libata functions and hooks, this function
4021 * starts an ATA command. ATA commands are grouped into
4022 * classes called "protocols", and issuing each type of protocol
4023 * is slightly different.
4025 * May be used as the qc_issue() entry in ata_port_operations.
4028 * spin_lock_irqsave(host_set lock)
4031 * Zero on success, AC_ERR_* mask on failure
4034 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4036 struct ata_port *ap = qc->ap;
4038 /* Use polling pio if the LLD doesn't handle
4039 * interrupt driven pio and atapi CDB interrupt.
4041 if (ap->flags & ATA_FLAG_PIO_POLLING) {
4042 switch (qc->tf.protocol) {
4044 case ATA_PROT_ATAPI:
4045 case ATA_PROT_ATAPI_NODATA:
4046 qc->tf.flags |= ATA_TFLAG_POLLING;
4048 case ATA_PROT_ATAPI_DMA:
4049 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
4050 /* see ata_check_atapi_dma() */
4058 /* select the device */
4059 ata_dev_select(ap, qc->dev->devno, 1, 0);
4061 /* start the command */
4062 switch (qc->tf.protocol) {
4063 case ATA_PROT_NODATA:
4064 if (qc->tf.flags & ATA_TFLAG_POLLING)
4065 ata_qc_set_polling(qc);
4067 ata_tf_to_host(ap, &qc->tf);
4068 ap->hsm_task_state = HSM_ST_LAST;
4070 if (qc->tf.flags & ATA_TFLAG_POLLING)
4071 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4076 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4078 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4079 ap->ops->bmdma_setup(qc); /* set up bmdma */
4080 ap->ops->bmdma_start(qc); /* initiate bmdma */
4081 ap->hsm_task_state = HSM_ST_LAST;
4085 if (qc->tf.flags & ATA_TFLAG_POLLING)
4086 ata_qc_set_polling(qc);
4088 ata_tf_to_host(ap, &qc->tf);
4090 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4091 /* PIO data out protocol */
4092 ap->hsm_task_state = HSM_ST_FIRST;
4093 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4095 /* always send first data block using
4096 * the ata_pio_task() codepath.
4099 /* PIO data in protocol */
4100 ap->hsm_task_state = HSM_ST;
4102 if (qc->tf.flags & ATA_TFLAG_POLLING)
4103 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4105 /* if polling, ata_pio_task() handles the rest.
4106 * otherwise, interrupt handler takes over from here.
4112 case ATA_PROT_ATAPI:
4113 case ATA_PROT_ATAPI_NODATA:
4114 if (qc->tf.flags & ATA_TFLAG_POLLING)
4115 ata_qc_set_polling(qc);
4117 ata_tf_to_host(ap, &qc->tf);
4119 ap->hsm_task_state = HSM_ST_FIRST;
4121 /* send cdb by polling if no cdb interrupt */
4122 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
4123 (qc->tf.flags & ATA_TFLAG_POLLING))
4124 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4127 case ATA_PROT_ATAPI_DMA:
4128 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4130 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4131 ap->ops->bmdma_setup(qc); /* set up bmdma */
4132 ap->hsm_task_state = HSM_ST_FIRST;
4134 /* send cdb by polling if no cdb interrupt */
4135 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4136 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4141 return AC_ERR_SYSTEM;
4148 * ata_host_intr - Handle host interrupt for given (port, task)
4149 * @ap: Port on which interrupt arrived (possibly...)
4150 * @qc: Taskfile currently active in engine
4152 * Handle host interrupt for given queued command. Currently,
4153 * only DMA interrupts are handled. All other commands are
4154 * handled via polling with interrupts disabled (nIEN bit).
4157 * spin_lock_irqsave(host_set lock)
4160 * One if interrupt was handled, zero if not (shared irq).
4163 inline unsigned int ata_host_intr (struct ata_port *ap,
4164 struct ata_queued_cmd *qc)
4166 u8 status, host_stat = 0;
4168 VPRINTK("ata%u: protocol %d task_state %d\n",
4169 ap->id, qc->tf.protocol, ap->hsm_task_state);
4171 /* Check whether we are expecting interrupt in this state */
4172 switch (ap->hsm_task_state) {
4174 /* Some pre-ATAPI-4 devices assert INTRQ
4175 * at this state when ready to receive CDB.
4178 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4179 * The flag was turned on only for atapi devices.
4180 * No need to check is_atapi_taskfile(&qc->tf) again.
4182 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4186 if (qc->tf.protocol == ATA_PROT_DMA ||
4187 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
4188 /* check status of DMA engine */
4189 host_stat = ap->ops->bmdma_status(ap);
4190 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4192 /* if it's not our irq... */
4193 if (!(host_stat & ATA_DMA_INTR))
4196 /* before we do anything else, clear DMA-Start bit */
4197 ap->ops->bmdma_stop(qc);
4199 if (unlikely(host_stat & ATA_DMA_ERR)) {
4200 /* error when transfering data to/from memory */
4201 qc->err_mask |= AC_ERR_HOST_BUS;
4202 ap->hsm_task_state = HSM_ST_ERR;
4212 /* check altstatus */
4213 status = ata_altstatus(ap);
4214 if (status & ATA_BUSY)
4217 /* check main status, clearing INTRQ */
4218 status = ata_chk_status(ap);
4219 if (unlikely(status & ATA_BUSY))
4222 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4223 ap->id, qc->tf.protocol, ap->hsm_task_state, status);
4225 /* ack bmdma irq events */
4226 ap->ops->irq_clear(ap);
4228 ata_hsm_move(ap, qc, status, 0);
4229 return 1; /* irq handled */
4232 ap->stats.idle_irq++;
4235 if ((ap->stats.idle_irq % 1000) == 0) {
4236 ata_irq_ack(ap, 0); /* debug trap */
4237 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4241 return 0; /* irq not handled */
4245 * ata_interrupt - Default ATA host interrupt handler
4246 * @irq: irq line (unused)
4247 * @dev_instance: pointer to our ata_host_set information structure
4250 * Default interrupt handler for PCI IDE devices. Calls
4251 * ata_host_intr() for each port that is not disabled.
4254 * Obtains host_set lock during operation.
4257 * IRQ_NONE or IRQ_HANDLED.
4260 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4262 struct ata_host_set *host_set = dev_instance;
4264 unsigned int handled = 0;
4265 unsigned long flags;
4267 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4268 spin_lock_irqsave(&host_set->lock, flags);
4270 for (i = 0; i < host_set->n_ports; i++) {
4271 struct ata_port *ap;
4273 ap = host_set->ports[i];
4275 !(ap->flags & ATA_FLAG_PORT_DISABLED)) {
4276 struct ata_queued_cmd *qc;
4278 qc = ata_qc_from_tag(ap, ap->active_tag);
4279 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
4280 (qc->flags & ATA_QCFLAG_ACTIVE))
4281 handled |= ata_host_intr(ap, qc);
4285 spin_unlock_irqrestore(&host_set->lock, flags);
4287 return IRQ_RETVAL(handled);
4292 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4293 * without filling any other registers
4295 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4298 struct ata_taskfile tf;
4301 ata_tf_init(ap, &tf, dev->devno);
4304 tf.flags |= ATA_TFLAG_DEVICE;
4305 tf.protocol = ATA_PROT_NODATA;
4307 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4309 printk(KERN_ERR "%s: ata command failed: %d\n",
4315 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4319 if (!ata_try_flush_cache(dev))
4322 if (ata_id_has_flush_ext(dev->id))
4323 cmd = ATA_CMD_FLUSH_EXT;
4325 cmd = ATA_CMD_FLUSH;
4327 return ata_do_simple_cmd(ap, dev, cmd);
4330 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4332 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4335 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4337 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4341 * ata_device_resume - wakeup a previously suspended devices
4342 * @ap: port the device is connected to
4343 * @dev: the device to resume
4345 * Kick the drive back into action, by sending it an idle immediate
4346 * command and making sure its transfer mode matches between drive
4350 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4352 if (ap->flags & ATA_FLAG_SUSPENDED) {
4353 ap->flags &= ~ATA_FLAG_SUSPENDED;
4356 if (!ata_dev_present(dev))
4358 if (dev->class == ATA_DEV_ATA)
4359 ata_start_drive(ap, dev);
4365 * ata_device_suspend - prepare a device for suspend
4366 * @ap: port the device is connected to
4367 * @dev: the device to suspend
4369 * Flush the cache on the drive, if appropriate, then issue a
4370 * standbynow command.
4372 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev, pm_message_t state)
4374 if (!ata_dev_present(dev))
4376 if (dev->class == ATA_DEV_ATA)
4377 ata_flush_cache(ap, dev);
4379 if (state.event != PM_EVENT_FREEZE)
4380 ata_standby_drive(ap, dev);
4381 ap->flags |= ATA_FLAG_SUSPENDED;
4386 * ata_port_start - Set port up for dma.
4387 * @ap: Port to initialize
4389 * Called just after data structures for each port are
4390 * initialized. Allocates space for PRD table.
4392 * May be used as the port_start() entry in ata_port_operations.
4395 * Inherited from caller.
4398 int ata_port_start (struct ata_port *ap)
4400 struct device *dev = ap->dev;
4403 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4407 rc = ata_pad_alloc(ap, dev);
4409 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4413 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4420 * ata_port_stop - Undo ata_port_start()
4421 * @ap: Port to shut down
4423 * Frees the PRD table.
4425 * May be used as the port_stop() entry in ata_port_operations.
4428 * Inherited from caller.
4431 void ata_port_stop (struct ata_port *ap)
4433 struct device *dev = ap->dev;
4435 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4436 ata_pad_free(ap, dev);
4439 void ata_host_stop (struct ata_host_set *host_set)
4441 if (host_set->mmio_base)
4442 iounmap(host_set->mmio_base);
4447 * ata_host_remove - Unregister SCSI host structure with upper layers
4448 * @ap: Port to unregister
4449 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4452 * Inherited from caller.
4455 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4457 struct Scsi_Host *sh = ap->host;
4462 scsi_remove_host(sh);
4464 ap->ops->port_stop(ap);
4468 * ata_host_init - Initialize an ata_port structure
4469 * @ap: Structure to initialize
4470 * @host: associated SCSI mid-layer structure
4471 * @host_set: Collection of hosts to which @ap belongs
4472 * @ent: Probe information provided by low-level driver
4473 * @port_no: Port number associated with this ata_port
4475 * Initialize a new ata_port structure, and its associated
4479 * Inherited from caller.
4482 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4483 struct ata_host_set *host_set,
4484 const struct ata_probe_ent *ent, unsigned int port_no)
4490 host->max_channel = 1;
4491 host->unique_id = ata_unique_id++;
4492 host->max_cmd_len = 12;
4494 ap->flags = ATA_FLAG_PORT_DISABLED;
4495 ap->id = host->unique_id;
4497 ap->ctl = ATA_DEVCTL_OBS;
4498 ap->host_set = host_set;
4500 ap->port_no = port_no;
4502 ent->legacy_mode ? ent->hard_port_no : port_no;
4503 ap->pio_mask = ent->pio_mask;
4504 ap->mwdma_mask = ent->mwdma_mask;
4505 ap->udma_mask = ent->udma_mask;
4506 ap->flags |= ent->host_flags;
4507 ap->ops = ent->port_ops;
4508 ap->cbl = ATA_CBL_NONE;
4509 ap->active_tag = ATA_TAG_POISON;
4510 ap->last_ctl = 0xFF;
4512 INIT_WORK(&ap->port_task, NULL, NULL);
4513 INIT_LIST_HEAD(&ap->eh_done_q);
4515 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4516 struct ata_device *dev = &ap->device[i];
4518 dev->pio_mask = UINT_MAX;
4519 dev->mwdma_mask = UINT_MAX;
4520 dev->udma_mask = UINT_MAX;
4524 ap->stats.unhandled_irq = 1;
4525 ap->stats.idle_irq = 1;
4528 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4532 * ata_host_add - Attach low-level ATA driver to system
4533 * @ent: Information provided by low-level driver
4534 * @host_set: Collections of ports to which we add
4535 * @port_no: Port number associated with this host
4537 * Attach low-level ATA driver to system.
4540 * PCI/etc. bus probe sem.
4543 * New ata_port on success, for NULL on error.
4546 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4547 struct ata_host_set *host_set,
4548 unsigned int port_no)
4550 struct Scsi_Host *host;
4551 struct ata_port *ap;
4556 if (!ent->port_ops->probe_reset &&
4557 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
4558 printk(KERN_ERR "ata%u: no reset mechanism available\n",
4563 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4567 host->transportt = &ata_scsi_transport_template;
4569 ap = (struct ata_port *) &host->hostdata[0];
4571 ata_host_init(ap, host, host_set, ent, port_no);
4573 rc = ap->ops->port_start(ap);
4580 scsi_host_put(host);
4585 * ata_device_add - Register hardware device with ATA and SCSI layers
4586 * @ent: Probe information describing hardware device to be registered
4588 * This function processes the information provided in the probe
4589 * information struct @ent, allocates the necessary ATA and SCSI
4590 * host information structures, initializes them, and registers
4591 * everything with requisite kernel subsystems.
4593 * This function requests irqs, probes the ATA bus, and probes
4597 * PCI/etc. bus probe sem.
4600 * Number of ports registered. Zero on error (no ports registered).
4603 int ata_device_add(const struct ata_probe_ent *ent)
4605 unsigned int count = 0, i;
4606 struct device *dev = ent->dev;
4607 struct ata_host_set *host_set;
4610 /* alloc a container for our list of ATA ports (buses) */
4611 host_set = kzalloc(sizeof(struct ata_host_set) +
4612 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4615 spin_lock_init(&host_set->lock);
4617 host_set->dev = dev;
4618 host_set->n_ports = ent->n_ports;
4619 host_set->irq = ent->irq;
4620 host_set->mmio_base = ent->mmio_base;
4621 host_set->private_data = ent->private_data;
4622 host_set->ops = ent->port_ops;
4624 /* register each port bound to this device */
4625 for (i = 0; i < ent->n_ports; i++) {
4626 struct ata_port *ap;
4627 unsigned long xfer_mode_mask;
4629 ap = ata_host_add(ent, host_set, i);
4633 host_set->ports[i] = ap;
4634 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4635 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4636 (ap->pio_mask << ATA_SHIFT_PIO);
4638 /* print per-port info to dmesg */
4639 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4640 "bmdma 0x%lX irq %lu\n",
4642 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4643 ata_mode_string(xfer_mode_mask),
4644 ap->ioaddr.cmd_addr,
4645 ap->ioaddr.ctl_addr,
4646 ap->ioaddr.bmdma_addr,
4650 host_set->ops->irq_clear(ap);
4657 /* obtain irq, that is shared between channels */
4658 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4659 DRV_NAME, host_set))
4662 /* perform each probe synchronously */
4663 DPRINTK("probe begin\n");
4664 for (i = 0; i < count; i++) {
4665 struct ata_port *ap;
4668 ap = host_set->ports[i];
4670 DPRINTK("ata%u: bus probe begin\n", ap->id);
4671 rc = ata_bus_probe(ap);
4672 DPRINTK("ata%u: bus probe end\n", ap->id);
4675 /* FIXME: do something useful here?
4676 * Current libata behavior will
4677 * tear down everything when
4678 * the module is removed
4679 * or the h/w is unplugged.
4683 rc = scsi_add_host(ap->host, dev);
4685 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4687 /* FIXME: do something useful here */
4688 /* FIXME: handle unconditional calls to
4689 * scsi_scan_host and ata_host_remove, below,
4695 /* probes are done, now scan each port's disk(s) */
4696 DPRINTK("host probe begin\n");
4697 for (i = 0; i < count; i++) {
4698 struct ata_port *ap = host_set->ports[i];
4700 ata_scsi_scan_host(ap);
4703 dev_set_drvdata(dev, host_set);
4705 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4706 return ent->n_ports; /* success */
4709 for (i = 0; i < count; i++) {
4710 ata_host_remove(host_set->ports[i], 1);
4711 scsi_host_put(host_set->ports[i]->host);
4715 VPRINTK("EXIT, returning 0\n");
4720 * ata_host_set_remove - PCI layer callback for device removal
4721 * @host_set: ATA host set that was removed
4723 * Unregister all objects associated with this host set. Free those
4727 * Inherited from calling layer (may sleep).
4730 void ata_host_set_remove(struct ata_host_set *host_set)
4732 struct ata_port *ap;
4735 for (i = 0; i < host_set->n_ports; i++) {
4736 ap = host_set->ports[i];
4737 scsi_remove_host(ap->host);
4740 free_irq(host_set->irq, host_set);
4742 for (i = 0; i < host_set->n_ports; i++) {
4743 ap = host_set->ports[i];
4745 ata_scsi_release(ap->host);
4747 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4748 struct ata_ioports *ioaddr = &ap->ioaddr;
4750 if (ioaddr->cmd_addr == 0x1f0)
4751 release_region(0x1f0, 8);
4752 else if (ioaddr->cmd_addr == 0x170)
4753 release_region(0x170, 8);
4756 scsi_host_put(ap->host);
4759 if (host_set->ops->host_stop)
4760 host_set->ops->host_stop(host_set);
4766 * ata_scsi_release - SCSI layer callback hook for host unload
4767 * @host: libata host to be unloaded
4769 * Performs all duties necessary to shut down a libata port...
4770 * Kill port kthread, disable port, and release resources.
4773 * Inherited from SCSI layer.
4779 int ata_scsi_release(struct Scsi_Host *host)
4781 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4786 ap->ops->port_disable(ap);
4787 ata_host_remove(ap, 0);
4788 for (i = 0; i < ATA_MAX_DEVICES; i++)
4789 kfree(ap->device[i].id);
4796 * ata_std_ports - initialize ioaddr with standard port offsets.
4797 * @ioaddr: IO address structure to be initialized
4799 * Utility function which initializes data_addr, error_addr,
4800 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4801 * device_addr, status_addr, and command_addr to standard offsets
4802 * relative to cmd_addr.
4804 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4807 void ata_std_ports(struct ata_ioports *ioaddr)
4809 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4810 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4811 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4812 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4813 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4814 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4815 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4816 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4817 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4818 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4824 void ata_pci_host_stop (struct ata_host_set *host_set)
4826 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4828 pci_iounmap(pdev, host_set->mmio_base);
4832 * ata_pci_remove_one - PCI layer callback for device removal
4833 * @pdev: PCI device that was removed
4835 * PCI layer indicates to libata via this hook that
4836 * hot-unplug or module unload event has occurred.
4837 * Handle this by unregistering all objects associated
4838 * with this PCI device. Free those objects. Then finally
4839 * release PCI resources and disable device.
4842 * Inherited from PCI layer (may sleep).
4845 void ata_pci_remove_one (struct pci_dev *pdev)
4847 struct device *dev = pci_dev_to_dev(pdev);
4848 struct ata_host_set *host_set = dev_get_drvdata(dev);
4850 ata_host_set_remove(host_set);
4851 pci_release_regions(pdev);
4852 pci_disable_device(pdev);
4853 dev_set_drvdata(dev, NULL);
4856 /* move to PCI subsystem */
4857 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4859 unsigned long tmp = 0;
4861 switch (bits->width) {
4864 pci_read_config_byte(pdev, bits->reg, &tmp8);
4870 pci_read_config_word(pdev, bits->reg, &tmp16);
4876 pci_read_config_dword(pdev, bits->reg, &tmp32);
4887 return (tmp == bits->val) ? 1 : 0;
4890 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4892 pci_save_state(pdev);
4893 pci_disable_device(pdev);
4894 pci_set_power_state(pdev, PCI_D3hot);
4898 int ata_pci_device_resume(struct pci_dev *pdev)
4900 pci_set_power_state(pdev, PCI_D0);
4901 pci_restore_state(pdev);
4902 pci_enable_device(pdev);
4903 pci_set_master(pdev);
4906 #endif /* CONFIG_PCI */
4909 static int __init ata_init(void)
4911 ata_wq = create_workqueue("ata");
4915 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4919 static void __exit ata_exit(void)
4921 destroy_workqueue(ata_wq);
4924 module_init(ata_init);
4925 module_exit(ata_exit);
4927 static unsigned long ratelimit_time;
4928 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4930 int ata_ratelimit(void)
4933 unsigned long flags;
4935 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4937 if (time_after(jiffies, ratelimit_time)) {
4939 ratelimit_time = jiffies + (HZ/5);
4943 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4949 * libata is essentially a library of internal helper functions for
4950 * low-level ATA host controller drivers. As such, the API/ABI is
4951 * likely to change as new drivers are added and updated.
4952 * Do not depend on ABI/API stability.
4955 EXPORT_SYMBOL_GPL(ata_std_bios_param);
4956 EXPORT_SYMBOL_GPL(ata_std_ports);
4957 EXPORT_SYMBOL_GPL(ata_device_add);
4958 EXPORT_SYMBOL_GPL(ata_host_set_remove);
4959 EXPORT_SYMBOL_GPL(ata_sg_init);
4960 EXPORT_SYMBOL_GPL(ata_sg_init_one);
4961 EXPORT_SYMBOL_GPL(__ata_qc_complete);
4962 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4963 EXPORT_SYMBOL_GPL(ata_eng_timeout);
4964 EXPORT_SYMBOL_GPL(ata_tf_load);
4965 EXPORT_SYMBOL_GPL(ata_tf_read);
4966 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4967 EXPORT_SYMBOL_GPL(ata_std_dev_select);
4968 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4969 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4970 EXPORT_SYMBOL_GPL(ata_check_status);
4971 EXPORT_SYMBOL_GPL(ata_altstatus);
4972 EXPORT_SYMBOL_GPL(ata_exec_command);
4973 EXPORT_SYMBOL_GPL(ata_port_start);
4974 EXPORT_SYMBOL_GPL(ata_port_stop);
4975 EXPORT_SYMBOL_GPL(ata_host_stop);
4976 EXPORT_SYMBOL_GPL(ata_interrupt);
4977 EXPORT_SYMBOL_GPL(ata_qc_prep);
4978 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
4979 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4980 EXPORT_SYMBOL_GPL(ata_bmdma_start);
4981 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4982 EXPORT_SYMBOL_GPL(ata_bmdma_status);
4983 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4984 EXPORT_SYMBOL_GPL(ata_port_probe);
4985 EXPORT_SYMBOL_GPL(sata_phy_reset);
4986 EXPORT_SYMBOL_GPL(__sata_phy_reset);
4987 EXPORT_SYMBOL_GPL(ata_bus_reset);
4988 EXPORT_SYMBOL_GPL(ata_std_probeinit);
4989 EXPORT_SYMBOL_GPL(ata_std_softreset);
4990 EXPORT_SYMBOL_GPL(sata_std_hardreset);
4991 EXPORT_SYMBOL_GPL(ata_std_postreset);
4992 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
4993 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
4994 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
4995 EXPORT_SYMBOL_GPL(ata_dev_classify);
4996 EXPORT_SYMBOL_GPL(ata_dev_pair);
4997 EXPORT_SYMBOL_GPL(ata_port_disable);
4998 EXPORT_SYMBOL_GPL(ata_ratelimit);
4999 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5000 EXPORT_SYMBOL_GPL(ata_port_queue_task);
5001 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5002 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5003 EXPORT_SYMBOL_GPL(ata_scsi_error);
5004 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5005 EXPORT_SYMBOL_GPL(ata_scsi_release);
5006 EXPORT_SYMBOL_GPL(ata_host_intr);
5007 EXPORT_SYMBOL_GPL(ata_id_string);
5008 EXPORT_SYMBOL_GPL(ata_id_c_string);
5009 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5010 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5011 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
5013 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5014 EXPORT_SYMBOL_GPL(ata_timing_compute);
5015 EXPORT_SYMBOL_GPL(ata_timing_merge);
5018 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5019 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5020 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5021 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5022 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5023 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5024 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5025 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
5026 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
5027 #endif /* CONFIG_PCI */
5029 EXPORT_SYMBOL_GPL(ata_device_suspend);
5030 EXPORT_SYMBOL_GPL(ata_device_resume);
5031 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5032 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);