2 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
3 * Copyright 2003-2004 Jeff Garzik
4 * Copyright (C) 2008 Freescale Semiconductor, Inc.
5 * Dave Liu <daveliu@freescale.com>
6 * port from libata of linux kernel
8 * SPDX-License-Identifier: GPL-2.0+
17 /* various global constants */
18 ATA_MAX_DEVICES = 2, /* per bus/port */
19 ATA_MAX_PRD = 256, /* we could make these 256/256 */
21 ATA_MAX_SECTORS_128 = 128,
22 ATA_MAX_SECTORS = 256,
23 ATA_MAX_SECTORS_LBA48 = 65535,
24 ATA_MAX_SECTORS_TAPE = 65535,
30 ATA_ID_OLD_PIO_MODES = 51,
31 ATA_ID_FIELD_VALID = 53,
32 ATA_ID_LBA_SECTORS = 60,
33 ATA_ID_MWDMA_MODES = 63,
34 ATA_ID_PIO_MODES = 64,
35 ATA_ID_EIDE_DMA_MIN = 65,
37 ATA_ID_EIDE_PIO_IORDY = 68,
38 ATA_ID_PIO4 = (1 << 1),
39 ATA_ID_QUEUE_DEPTH = 75,
41 ATA_ID_SATA_FEATURES = 78,
42 ATA_ID_SATA_FEATURES_EN = 79,
43 ATA_ID_MAJOR_VER = 80,
44 ATA_ID_MINOR_VER = 81,
45 ATA_ID_UDMA_MODES = 88,
46 ATA_ID_LBA48_SECTORS = 100,
48 ATA_ID_SERNO_LEN = 20,
49 ATA_ID_FW_REV_LEN = 8,
55 ATA_PIO1 = ATA_PIO0 | (1 << 1),
56 ATA_PIO2 = ATA_PIO1 | (1 << 2),
57 ATA_PIO3 = ATA_PIO2 | (1 << 3),
58 ATA_PIO4 = ATA_PIO3 | (1 << 4),
59 ATA_PIO5 = ATA_PIO4 | (1 << 5),
60 ATA_PIO6 = ATA_PIO5 | (1 << 6),
62 ATA_SWDMA0 = (1 << 0),
63 ATA_SWDMA1 = ATA_SWDMA0 | (1 << 1),
64 ATA_SWDMA2 = ATA_SWDMA1 | (1 << 2),
66 ATA_SWDMA2_ONLY = (1 << 2),
68 ATA_MWDMA0 = (1 << 0),
69 ATA_MWDMA1 = ATA_MWDMA0 | (1 << 1),
70 ATA_MWDMA2 = ATA_MWDMA1 | (1 << 2),
72 ATA_MWDMA12_ONLY = (1 << 1) | (1 << 2),
73 ATA_MWDMA2_ONLY = (1 << 2),
76 ATA_UDMA1 = ATA_UDMA0 | (1 << 1),
77 ATA_UDMA2 = ATA_UDMA1 | (1 << 2),
78 ATA_UDMA3 = ATA_UDMA2 | (1 << 3),
79 ATA_UDMA4 = ATA_UDMA3 | (1 << 4),
80 ATA_UDMA5 = ATA_UDMA4 | (1 << 5),
81 ATA_UDMA6 = ATA_UDMA5 | (1 << 6),
82 ATA_UDMA7 = ATA_UDMA6 | (1 << 7),
83 /* ATA_UDMA7 is just for completeness... doesn't exist (yet?). */
85 ATA_UDMA_MASK_40C = ATA_UDMA2, /* udma0-2 */
89 ATA_PRD_TBL_SZ = (ATA_MAX_PRD * ATA_PRD_SZ),
90 ATA_PRD_EOT = (1 << 31), /* end-of-table flag */
92 ATA_DMA_TABLE_OFS = 4,
95 ATA_DMA_WR = (1 << 3),
96 ATA_DMA_START = (1 << 0),
97 ATA_DMA_INTR = (1 << 2),
98 ATA_DMA_ERR = (1 << 1),
99 ATA_DMA_ACTIVE = (1 << 0),
101 /* bits in ATA command block registers */
102 ATA_HOB = (1 << 7), /* LBA48 selector */
103 ATA_NIEN = (1 << 1), /* disable-irq flag */
104 ATA_LBA = (1 << 6), /* LBA28 selector */
105 ATA_DEV1 = (1 << 4), /* Select Device 1 (slave) */
106 ATA_DEVICE_OBS = (1 << 7) | (1 << 5), /* obs bits in dev reg */
107 ATA_DEVCTL_OBS = (1 << 3), /* obsolete bit in devctl reg */
108 ATA_BUSY = (1 << 7), /* BSY status bit */
109 ATA_DRDY = (1 << 6), /* device ready */
110 ATA_DF = (1 << 5), /* device fault */
111 ATA_DRQ = (1 << 3), /* data request i/o */
112 ATA_ERR = (1 << 0), /* have an error */
113 ATA_SRST = (1 << 2), /* software reset */
114 ATA_ICRC = (1 << 7), /* interface CRC error */
115 ATA_UNC = (1 << 6), /* uncorrectable media error */
116 ATA_IDNF = (1 << 4), /* ID not found */
117 ATA_ABORTED = (1 << 2), /* command aborted */
119 /* ATA command block registers */
122 ATA_REG_NSECT = 0x02,
126 ATA_REG_DEVICE = 0x06,
127 ATA_REG_STATUS = 0x07,
129 ATA_REG_FEATURE = ATA_REG_ERR, /* and their aliases */
130 ATA_REG_CMD = ATA_REG_STATUS,
131 ATA_REG_BYTEL = ATA_REG_LBAM,
132 ATA_REG_BYTEH = ATA_REG_LBAH,
133 ATA_REG_DEVSEL = ATA_REG_DEVICE,
134 ATA_REG_IRQ = ATA_REG_NSECT,
136 /* ATA device commands */
137 ATA_CMD_DEV_RESET = 0x08, /* ATAPI device reset */
138 ATA_CMD_CHK_POWER = 0xE5, /* check power mode */
139 ATA_CMD_STANDBY = 0xE2, /* place in standby power mode */
140 ATA_CMD_IDLE = 0xE3, /* place in idle power mode */
141 ATA_CMD_EDD = 0x90, /* execute device diagnostic */
142 ATA_CMD_FLUSH = 0xE7,
143 ATA_CMD_FLUSH_EXT = 0xEA,
144 ATA_CMD_ID_ATA = 0xEC,
145 ATA_CMD_ID_ATAPI = 0xA1,
147 ATA_CMD_READ_EXT = 0x25,
148 ATA_CMD_WRITE = 0xCA,
149 ATA_CMD_WRITE_EXT = 0x35,
150 ATA_CMD_WRITE_FUA_EXT = 0x3D,
151 ATA_CMD_FPDMA_READ = 0x60,
152 ATA_CMD_FPDMA_WRITE = 0x61,
153 ATA_CMD_PIO_READ = 0x20,
154 ATA_CMD_PIO_READ_EXT = 0x24,
155 ATA_CMD_PIO_WRITE = 0x30,
156 ATA_CMD_PIO_WRITE_EXT = 0x34,
157 ATA_CMD_READ_MULTI = 0xC4,
158 ATA_CMD_READ_MULTI_EXT = 0x29,
159 ATA_CMD_WRITE_MULTI = 0xC5,
160 ATA_CMD_WRITE_MULTI_EXT = 0x39,
161 ATA_CMD_WRITE_MULTI_FUA_EXT = 0xCE,
162 ATA_CMD_SET_FEATURES = 0xEF,
163 ATA_CMD_SET_MULTI = 0xC6,
164 ATA_CMD_PACKET = 0xA0,
165 ATA_CMD_VERIFY = 0x40,
166 ATA_CMD_VERIFY_EXT = 0x42,
167 ATA_CMD_STANDBYNOW1 = 0xE0,
168 ATA_CMD_IDLEIMMEDIATE = 0xE1,
169 ATA_CMD_SLEEP = 0xE6,
170 ATA_CMD_INIT_DEV_PARAMS = 0x91,
171 ATA_CMD_READ_NATIVE_MAX = 0xF8,
172 ATA_CMD_READ_NATIVE_MAX_EXT = 0x27,
173 ATA_CMD_SET_MAX = 0xF9,
174 ATA_CMD_SET_MAX_EXT = 0x37,
175 ATA_CMD_READ_LOG_EXT = 0x2f,
176 ATA_CMD_PMP_READ = 0xE4,
177 ATA_CMD_PMP_WRITE = 0xE8,
178 ATA_CMD_CONF_OVERLAY = 0xB1,
179 ATA_CMD_SEC_FREEZE_LOCK = 0xF5,
181 /* READ_LOG_EXT pages */
182 ATA_LOG_SATA_NCQ = 0x10,
184 /* READ/WRITE LONG (obsolete) */
185 ATA_CMD_READ_LONG = 0x22,
186 ATA_CMD_READ_LONG_ONCE = 0x23,
187 ATA_CMD_WRITE_LONG = 0x32,
188 ATA_CMD_WRITE_LONG_ONCE = 0x33,
190 /* SETFEATURES stuff */
191 SETFEATURES_XFER = 0x03,
200 XFER_MW_DMA_4 = 0x24, /* CFA only */
201 XFER_MW_DMA_3 = 0x23, /* CFA only */
202 XFER_MW_DMA_2 = 0x22,
203 XFER_MW_DMA_1 = 0x21,
204 XFER_MW_DMA_0 = 0x20,
205 XFER_SW_DMA_2 = 0x12,
206 XFER_SW_DMA_1 = 0x11,
207 XFER_SW_DMA_0 = 0x10,
208 XFER_PIO_6 = 0x0E, /* CFA only */
209 XFER_PIO_5 = 0x0D, /* CFA only */
215 XFER_PIO_SLOW = 0x00,
217 SETFEATURES_WC_ON = 0x02, /* Enable write cache */
218 SETFEATURES_WC_OFF = 0x82, /* Disable write cache */
220 SETFEATURES_SPINUP = 0x07, /* Spin-up drive */
222 SETFEATURES_SATA_ENABLE = 0x10, /* Enable use of SATA feature */
223 SETFEATURES_SATA_DISABLE = 0x90, /* Disable use of SATA feature */
225 /* SETFEATURE Sector counts for SATA features */
226 SATA_AN = 0x05, /* Asynchronous Notification */
227 SATA_DIPM = 0x03, /* Device Initiated Power Management */
229 /* feature values for SET_MAX */
230 ATA_SET_MAX_ADDR = 0x00,
231 ATA_SET_MAX_PASSWD = 0x01,
232 ATA_SET_MAX_LOCK = 0x02,
233 ATA_SET_MAX_UNLOCK = 0x03,
234 ATA_SET_MAX_FREEZE_LOCK = 0x04,
236 /* feature values for DEVICE CONFIGURATION OVERLAY */
237 ATA_DCO_RESTORE = 0xC0,
238 ATA_DCO_FREEZE_LOCK = 0xC1,
239 ATA_DCO_IDENTIFY = 0xC2,
243 ATAPI_PKT_DMA = (1 << 0),
244 ATAPI_DMADIR = (1 << 2), /* ATAPI data dir:
245 0=to device, 1=to host */
249 SATA_PMP_MAX_PORTS = 15,
250 SATA_PMP_CTRL_PORT = 15,
252 SATA_PMP_GSCR_DWORDS = 128,
253 SATA_PMP_GSCR_PROD_ID = 0,
254 SATA_PMP_GSCR_REV = 1,
255 SATA_PMP_GSCR_PORT_INFO = 2,
256 SATA_PMP_GSCR_ERROR = 32,
257 SATA_PMP_GSCR_ERROR_EN = 33,
258 SATA_PMP_GSCR_FEAT = 64,
259 SATA_PMP_GSCR_FEAT_EN = 96,
261 SATA_PMP_PSCR_STATUS = 0,
262 SATA_PMP_PSCR_ERROR = 1,
263 SATA_PMP_PSCR_CONTROL = 2,
265 SATA_PMP_FEAT_BIST = (1 << 0),
266 SATA_PMP_FEAT_PMREQ = (1 << 1),
267 SATA_PMP_FEAT_DYNSSC = (1 << 2),
268 SATA_PMP_FEAT_NOTIFY = (1 << 3),
274 ATA_CBL_PATA40_SHORT = 3, /* 40 wire cable to high UDMA spec */
275 ATA_CBL_PATA_UNK = 4, /* don't know, maybe 80c? */
276 ATA_CBL_PATA_IGN = 5, /* don't know, ignore cable handling */
279 /* SATA Status and Control Registers */
284 SCR_NOTIFICATION = 4,
287 SERR_DATA_RECOVERED = (1 << 0), /* recovered data error */
288 SERR_COMM_RECOVERED = (1 << 1), /* recovered comm failure */
289 SERR_DATA = (1 << 8), /* unrecovered data error */
290 SERR_PERSISTENT = (1 << 9), /* persistent data/comm error */
291 SERR_PROTOCOL = (1 << 10), /* protocol violation */
292 SERR_INTERNAL = (1 << 11), /* host internal error */
293 SERR_PHYRDY_CHG = (1 << 16), /* PHY RDY changed */
294 SERR_PHY_INT_ERR = (1 << 17), /* PHY internal error */
295 SERR_COMM_WAKE = (1 << 18), /* Comm wake */
296 SERR_10B_8B_ERR = (1 << 19), /* 10b to 8b decode error */
297 SERR_DISPARITY = (1 << 20), /* Disparity */
298 SERR_CRC = (1 << 21), /* CRC error */
299 SERR_HANDSHAKE = (1 << 22), /* Handshake error */
300 SERR_LINK_SEQ_ERR = (1 << 23), /* Link sequence error */
301 SERR_TRANS_ST_ERROR = (1 << 24), /* Transport state trans. error */
302 SERR_UNRECOG_FIS = (1 << 25), /* Unrecognized FIS */
303 SERR_DEV_XCHG = (1 << 26), /* device exchanged */
305 /* struct ata_taskfile flags */
306 ATA_TFLAG_LBA48 = (1 << 0), /* enable 48-bit LBA and "HOB" */
307 ATA_TFLAG_ISADDR = (1 << 1), /* enable r/w to nsect/lba regs */
308 ATA_TFLAG_DEVICE = (1 << 2), /* enable r/w to device reg */
309 ATA_TFLAG_WRITE = (1 << 3), /* data dir: host->dev==1 (write) */
310 ATA_TFLAG_LBA = (1 << 4), /* enable LBA */
311 ATA_TFLAG_FUA = (1 << 5), /* enable FUA */
312 ATA_TFLAG_POLLING = (1 << 6), /* set nIEN to 1 and use polling */
315 ATA_PROT_FLAG_PIO = (1 << 0), /* is PIO */
316 ATA_PROT_FLAG_DMA = (1 << 1), /* is DMA */
317 ATA_PROT_FLAG_DATA = ATA_PROT_FLAG_PIO | ATA_PROT_FLAG_DMA,
318 ATA_PROT_FLAG_NCQ = (1 << 2), /* is NCQ */
319 ATA_PROT_FLAG_ATAPI = (1 << 3), /* is ATAPI */
322 enum ata_tf_protocols {
323 /* ATA taskfile protocols */
324 ATA_PROT_UNKNOWN, /* unknown/invalid */
325 ATA_PROT_NODATA, /* no data */
326 ATA_PROT_PIO, /* PIO data xfer */
327 ATA_PROT_DMA, /* DMA */
328 ATA_PROT_NCQ, /* NCQ */
329 ATAPI_PROT_NODATA, /* packet command, no data */
330 ATAPI_PROT_PIO, /* packet command, PIO data xfer*/
331 ATAPI_PROT_DMA, /* packet command with special DMA sauce */
335 ATA_IOC_GET_IO32 = 0x309,
336 ATA_IOC_SET_IO32 = 0x324,
340 ATA_DEV_ATA, /* ATA device */
341 ATA_DEV_ATAPI, /* ATAPI device */
342 ATA_DEV_PMP, /* Port Multiplier Port */
343 ATA_DEV_UNKNOWN, /* unknown */
346 struct ata_taskfile {
347 unsigned long flags; /* ATA_TFLAG_xxx */
348 u8 protocol; /* ATA_PROT_xxx */
350 u8 ctl; /* control reg */
352 u8 hob_feature; /* additional data */
353 u8 hob_nsect; /* to support LBA48 */
366 u8 command; /* IO operation */
372 static inline unsigned int ata_prot_flags(u8 prot)
375 case ATA_PROT_NODATA:
378 return ATA_PROT_FLAG_PIO;
380 return ATA_PROT_FLAG_DMA;
382 return ATA_PROT_FLAG_DMA | ATA_PROT_FLAG_NCQ;
383 case ATAPI_PROT_NODATA:
384 return ATA_PROT_FLAG_ATAPI;
386 return ATA_PROT_FLAG_ATAPI | ATA_PROT_FLAG_PIO;
388 return ATA_PROT_FLAG_ATAPI | ATA_PROT_FLAG_DMA;
393 static inline int ata_is_atapi(u8 prot)
395 return ata_prot_flags(prot) & ATA_PROT_FLAG_ATAPI;
398 static inline int ata_is_nodata(u8 prot)
400 return !(ata_prot_flags(prot) & ATA_PROT_FLAG_DATA);
403 static inline int ata_is_pio(u8 prot)
405 return ata_prot_flags(prot) & ATA_PROT_FLAG_PIO;
408 static inline int ata_is_dma(u8 prot)
410 return ata_prot_flags(prot) & ATA_PROT_FLAG_DMA;
413 static inline int ata_is_ncq(u8 prot)
415 return ata_prot_flags(prot) & ATA_PROT_FLAG_NCQ;
418 static inline int ata_is_data(u8 prot)
420 return ata_prot_flags(prot) & ATA_PROT_FLAG_DATA;
426 #define ata_id_is_ata(id) (((id)[0] & (1 << 15)) == 0)
427 #define ata_id_has_lba(id) ((id)[49] & (1 << 9))
428 #define ata_id_has_dma(id) ((id)[49] & (1 << 8))
429 #define ata_id_has_ncq(id) ((id)[76] & (1 << 8))
430 #define ata_id_queue_depth(id) (((id)[75] & 0x1f) + 1)
431 #define ata_id_removeable(id) ((id)[0] & (1 << 7))
432 #define ata_id_iordy_disable(id) ((id)[49] & (1 << 10))
433 #define ata_id_has_iordy(id) ((id)[49] & (1 << 11))
435 #define ata_id_u32(id,n) \
436 (((u32) (id)[(n) + 1] << 16) | ((u32) (id)[(n)]))
437 #define ata_id_u64(id,n) \
438 ( ((u64) (id)[(n) + 3] << 48) | \
439 ((u64) (id)[(n) + 2] << 32) | \
440 ((u64) (id)[(n) + 1] << 16) | \
441 ((u64) (id)[(n) + 0]) )
443 #define ata_id_cdb_intr(id) (((id)[0] & 0x60) == 0x20)
445 static inline int ata_id_has_fua(const u16 *id)
447 if ((id[84] & 0xC000) != 0x4000)
449 return id[84] & (1 << 6);
452 static inline int ata_id_has_flush(const u16 *id)
454 if ((id[83] & 0xC000) != 0x4000)
456 return id[83] & (1 << 12);
459 static inline int ata_id_has_flush_ext(const u16 *id)
461 if ((id[83] & 0xC000) != 0x4000)
463 return id[83] & (1 << 13);
466 static inline int ata_id_has_lba48(const u16 *id)
468 if ((id[83] & 0xC000) != 0x4000)
470 if (!ata_id_u64(id, 100))
472 return id[83] & (1 << 10);
475 static inline int ata_id_hpa_enabled(const u16 *id)
477 /* Yes children, word 83 valid bits cover word 82 data */
478 if ((id[83] & 0xC000) != 0x4000)
480 /* And 87 covers 85-87 */
481 if ((id[87] & 0xC000) != 0x4000)
483 /* Check command sets enabled as well as supported */
484 if ((id[85] & ( 1 << 10)) == 0)
486 return id[82] & (1 << 10);
489 static inline int ata_id_has_wcache(const u16 *id)
491 /* Yes children, word 83 valid bits cover word 82 data */
492 if ((id[83] & 0xC000) != 0x4000)
494 return id[82] & (1 << 5);
497 static inline int ata_id_has_pm(const u16 *id)
499 if ((id[83] & 0xC000) != 0x4000)
501 return id[82] & (1 << 3);
504 static inline int ata_id_rahead_enabled(const u16 *id)
506 if ((id[87] & 0xC000) != 0x4000)
508 return id[85] & (1 << 6);
511 static inline int ata_id_wcache_enabled(const u16 *id)
513 if ((id[87] & 0xC000) != 0x4000)
515 return id[85] & (1 << 5);
518 static inline unsigned int ata_id_major_version(const u16 *id)
522 if (id[ATA_ID_MAJOR_VER] == 0xFFFF)
525 for (mver = 14; mver >= 1; mver--)
526 if (id[ATA_ID_MAJOR_VER] & (1 << mver))
531 static inline int ata_id_is_sata(const u16 *id)
533 return ata_id_major_version(id) >= 5 && id[93] == 0;
536 static inline int ata_id_has_tpm(const u16 *id)
538 /* The TPM bits are only valid on ATA8 */
539 if (ata_id_major_version(id) < 8)
541 if ((id[48] & 0xC000) != 0x4000)
543 return id[48] & (1 << 0);
546 static inline int ata_id_has_dword_io(const u16 *id)
548 /* ATA 8 reuses this flag for "trusted" computing */
549 if (ata_id_major_version(id) > 7)
551 if (id[48] & (1 << 0))
556 static inline int ata_id_current_chs_valid(const u16 *id)
558 /* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command
559 has not been issued to the device then the values of
560 id[54] to id[56] are vendor specific. */
561 return (id[53] & 0x01) && /* Current translation valid */
562 id[54] && /* cylinders in current translation */
563 id[55] && /* heads in current translation */
565 id[56]; /* sectors in current translation */
568 static inline int ata_id_is_cfa(const u16 *id)
571 if (v == 0x848A) /* Standard CF */
573 /* Could be CF hiding as standard ATA */
574 if (ata_id_major_version(id) >= 3 && id[82] != 0xFFFF &&
575 (id[82] & ( 1 << 2)))
580 static inline int ata_drive_40wire(const u16 *dev_id)
582 if (ata_id_is_sata(dev_id))
584 if ((dev_id[93] & 0xE000) == 0x6000)
585 return 0; /* 80 wire */
589 static inline int ata_drive_40wire_relaxed(const u16 *dev_id)
591 if ((dev_id[93] & 0x2000) == 0x2000)
592 return 0; /* 80 wire */
596 static inline int atapi_cdb_len(const u16 *dev_id)
598 u16 tmp = dev_id[0] & 0x3;
606 static inline int atapi_command_packet_set(const u16 *dev_id)
608 return (dev_id[0] >> 8) & 0x1f;
611 static inline int atapi_id_dmadir(const u16 *dev_id)
613 return ata_id_major_version(dev_id) >= 7 && (dev_id[62] & 0x8000);
616 static inline int is_multi_taskfile(struct ata_taskfile *tf)
618 return (tf->command == ATA_CMD_READ_MULTI) ||
619 (tf->command == ATA_CMD_WRITE_MULTI) ||
620 (tf->command == ATA_CMD_READ_MULTI_EXT) ||
621 (tf->command == ATA_CMD_WRITE_MULTI_EXT) ||
622 (tf->command == ATA_CMD_WRITE_MULTI_FUA_EXT);
625 static inline int ata_ok(u8 status)
627 return ((status & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ | ATA_ERR))
631 static inline int lba_28_ok(u64 block, u32 n_block)
633 /* check the ending block number */
634 return ((block + n_block - 1) < ((u64)1 << 28)) && (n_block <= 256);
637 static inline int lba_48_ok(u64 block, u32 n_block)
639 /* check the ending block number */
640 return ((block + n_block - 1) < ((u64)1 << 48)) && (n_block <= 65536);
643 #define sata_pmp_gscr_vendor(gscr) ((gscr)[SATA_PMP_GSCR_PROD_ID] & 0xffff)
644 #define sata_pmp_gscr_devid(gscr) ((gscr)[SATA_PMP_GSCR_PROD_ID] >> 16)
645 #define sata_pmp_gscr_rev(gscr) (((gscr)[SATA_PMP_GSCR_REV] >> 8) & 0xff)
646 #define sata_pmp_gscr_ports(gscr) ((gscr)[SATA_PMP_GSCR_PORT_INFO] & 0xf)
648 u64 ata_id_n_sectors(u16 *id);
649 u32 ata_dev_classify(u32 sig);
650 void ata_id_c_string(const u16 *id, unsigned char *s,
651 unsigned int ofs, unsigned int len);
652 void ata_dump_id(u16 *id);
653 void ata_swap_buf_le16(u16 *buf, unsigned int buf_words);
655 #endif /* __LIBATA_H__ */