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memcg: remove impossible conditional when committing
[linux-2.6.git] / drivers / ata / sata_sil24.c
blob06c564e550518125daa708f725983bf9347045c4
1 /*
2 * sata_sil24.c - Driver for Silicon Image 3124/3132 SATA-2 controllers
3 *
4 * Copyright 2005 Tejun Heo
5 *
6 * Based on preview driver from Silicon Image.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2, or (at your option) any
11 * later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 */
19
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/gfp.h>
23 #include <linux/pci.h>
24 #include <linux/blkdev.h>
25 #include <linux/delay.h>
26 #include <linux/interrupt.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/device.h>
29 #include <scsi/scsi_host.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <linux/libata.h>
32
33 #define DRV_NAME "sata_sil24"
34 #define DRV_VERSION "1.1"
35
36 /*
37 * Port request block (PRB) 32 bytes
38 */
39 struct sil24_prb {
40 __le16 ctrl;
41 __le16 prot;
42 __le32 rx_cnt;
43 u8 fis[6 * 4];
44 };
45
46 /*
47 * Scatter gather entry (SGE) 16 bytes
48 */
49 struct sil24_sge {
50 __le64 addr;
51 __le32 cnt;
52 __le32 flags;
53 };
54
55
56 enum {
57 SIL24_HOST_BAR = 0,
58 SIL24_PORT_BAR = 2,
59
60 /* sil24 fetches in chunks of 64bytes. The first block
61 * contains the PRB and two SGEs. From the second block, it's
62 * consisted of four SGEs and called SGT. Calculate the
63 * number of SGTs that fit into one page.
64 */
65 SIL24_PRB_SZ = sizeof(struct sil24_prb)
66 + 2 * sizeof(struct sil24_sge),
67 SIL24_MAX_SGT = (PAGE_SIZE - SIL24_PRB_SZ)
68 / (4 * sizeof(struct sil24_sge)),
69
70 /* This will give us one unused SGEs for ATA. This extra SGE
71 * will be used to store CDB for ATAPI devices.
72 */
73 SIL24_MAX_SGE = 4 * SIL24_MAX_SGT + 1,
74
75 /*
76 * Global controller registers (128 bytes @ BAR0)
77 */
78 /* 32 bit regs */
79 HOST_SLOT_STAT = 0x00, /* 32 bit slot stat * 4 */
80 HOST_CTRL = 0x40,
81 HOST_IRQ_STAT = 0x44,
82 HOST_PHY_CFG = 0x48,
83 HOST_BIST_CTRL = 0x50,
84 HOST_BIST_PTRN = 0x54,
85 HOST_BIST_STAT = 0x58,
86 HOST_MEM_BIST_STAT = 0x5c,
87 HOST_FLASH_CMD = 0x70,
88 /* 8 bit regs */
89 HOST_FLASH_DATA = 0x74,
90 HOST_TRANSITION_DETECT = 0x75,
91 HOST_GPIO_CTRL = 0x76,
92 HOST_I2C_ADDR = 0x78, /* 32 bit */
93 HOST_I2C_DATA = 0x7c,
94 HOST_I2C_XFER_CNT = 0x7e,
95 HOST_I2C_CTRL = 0x7f,
96
97 /* HOST_SLOT_STAT bits */
98 HOST_SSTAT_ATTN = (1 << 31),
99
100 /* HOST_CTRL bits */
101 HOST_CTRL_M66EN = (1 << 16), /* M66EN PCI bus signal */
102 HOST_CTRL_TRDY = (1 << 17), /* latched PCI TRDY */
103 HOST_CTRL_STOP = (1 << 18), /* latched PCI STOP */
104 HOST_CTRL_DEVSEL = (1 << 19), /* latched PCI DEVSEL */
105 HOST_CTRL_REQ64 = (1 << 20), /* latched PCI REQ64 */
106 HOST_CTRL_GLOBAL_RST = (1 << 31), /* global reset */
107
108 /*
109 * Port registers
110 * (8192 bytes @ +0x0000, +0x2000, +0x4000 and +0x6000 @ BAR2)
111 */
112 PORT_REGS_SIZE = 0x2000,
113
114 PORT_LRAM = 0x0000, /* 31 LRAM slots and PMP regs */
115 PORT_LRAM_SLOT_SZ = 0x0080, /* 32 bytes PRB + 2 SGE, ACT... */
116
117 PORT_PMP = 0x0f80, /* 8 bytes PMP * 16 (128 bytes) */
118 PORT_PMP_STATUS = 0x0000, /* port device status offset */
119 PORT_PMP_QACTIVE = 0x0004, /* port device QActive offset */
120 PORT_PMP_SIZE = 0x0008, /* 8 bytes per PMP */
121
122 /* 32 bit regs */
123 PORT_CTRL_STAT = 0x1000, /* write: ctrl-set, read: stat */
124 PORT_CTRL_CLR = 0x1004, /* write: ctrl-clear */
125 PORT_IRQ_STAT = 0x1008, /* high: status, low: interrupt */
126 PORT_IRQ_ENABLE_SET = 0x1010, /* write: enable-set */
127 PORT_IRQ_ENABLE_CLR = 0x1014, /* write: enable-clear */
128 PORT_ACTIVATE_UPPER_ADDR= 0x101c,
129 PORT_EXEC_FIFO = 0x1020, /* command execution fifo */
130 PORT_CMD_ERR = 0x1024, /* command error number */
131 PORT_FIS_CFG = 0x1028,
132 PORT_FIFO_THRES = 0x102c,
133 /* 16 bit regs */
134 PORT_DECODE_ERR_CNT = 0x1040,
135 PORT_DECODE_ERR_THRESH = 0x1042,
136 PORT_CRC_ERR_CNT = 0x1044,
137 PORT_CRC_ERR_THRESH = 0x1046,
138 PORT_HSHK_ERR_CNT = 0x1048,
139 PORT_HSHK_ERR_THRESH = 0x104a,
140 /* 32 bit regs */
141 PORT_PHY_CFG = 0x1050,
142 PORT_SLOT_STAT = 0x1800,
143 PORT_CMD_ACTIVATE = 0x1c00, /* 64 bit cmd activate * 31 (248 bytes) */
144 PORT_CONTEXT = 0x1e04,
145 PORT_EXEC_DIAG = 0x1e00, /* 32bit exec diag * 16 (64 bytes, 0-10 used on 3124) */
146 PORT_PSD_DIAG = 0x1e40, /* 32bit psd diag * 16 (64 bytes, 0-8 used on 3124) */
147 PORT_SCONTROL = 0x1f00,
148 PORT_SSTATUS = 0x1f04,
149 PORT_SERROR = 0x1f08,
150 PORT_SACTIVE = 0x1f0c,
151
152 /* PORT_CTRL_STAT bits */
153 PORT_CS_PORT_RST = (1 << 0), /* port reset */
154 PORT_CS_DEV_RST = (1 << 1), /* device reset */
155 PORT_CS_INIT = (1 << 2), /* port initialize */
156 PORT_CS_IRQ_WOC = (1 << 3), /* interrupt write one to clear */
157 PORT_CS_CDB16 = (1 << 5), /* 0=12b cdb, 1=16b cdb */
158 PORT_CS_PMP_RESUME = (1 << 6), /* PMP resume */
159 PORT_CS_32BIT_ACTV = (1 << 10), /* 32-bit activation */
160 PORT_CS_PMP_EN = (1 << 13), /* port multiplier enable */
161 PORT_CS_RDY = (1 << 31), /* port ready to accept commands */
162
163 /* PORT_IRQ_STAT/ENABLE_SET/CLR */
164 /* bits[11:0] are masked */
165 PORT_IRQ_COMPLETE = (1 << 0), /* command(s) completed */
166 PORT_IRQ_ERROR = (1 << 1), /* command execution error */
167 PORT_IRQ_PORTRDY_CHG = (1 << 2), /* port ready change */
168 PORT_IRQ_PWR_CHG = (1 << 3), /* power management change */
169 PORT_IRQ_PHYRDY_CHG = (1 << 4), /* PHY ready change */
170 PORT_IRQ_COMWAKE = (1 << 5), /* COMWAKE received */
171 PORT_IRQ_UNK_FIS = (1 << 6), /* unknown FIS received */
172 PORT_IRQ_DEV_XCHG = (1 << 7), /* device exchanged */
173 PORT_IRQ_8B10B = (1 << 8), /* 8b/10b decode error threshold */
174 PORT_IRQ_CRC = (1 << 9), /* CRC error threshold */
175 PORT_IRQ_HANDSHAKE = (1 << 10), /* handshake error threshold */
176 PORT_IRQ_SDB_NOTIFY = (1 << 11), /* SDB notify received */
177
178 DEF_PORT_IRQ = PORT_IRQ_COMPLETE | PORT_IRQ_ERROR |
179 PORT_IRQ_PHYRDY_CHG | PORT_IRQ_DEV_XCHG |
180 PORT_IRQ_UNK_FIS | PORT_IRQ_SDB_NOTIFY,
181
182 /* bits[27:16] are unmasked (raw) */
183 PORT_IRQ_RAW_SHIFT = 16,
184 PORT_IRQ_MASKED_MASK = 0x7ff,
185 PORT_IRQ_RAW_MASK = (0x7ff << PORT_IRQ_RAW_SHIFT),
186
187 /* ENABLE_SET/CLR specific, intr steering - 2 bit field */
188 PORT_IRQ_STEER_SHIFT = 30,
189 PORT_IRQ_STEER_MASK = (3 << PORT_IRQ_STEER_SHIFT),
190
191 /* PORT_CMD_ERR constants */
192 PORT_CERR_DEV = 1, /* Error bit in D2H Register FIS */
193 PORT_CERR_SDB = 2, /* Error bit in SDB FIS */
194 PORT_CERR_DATA = 3, /* Error in data FIS not detected by dev */
195 PORT_CERR_SEND = 4, /* Initial cmd FIS transmission failure */
196 PORT_CERR_INCONSISTENT = 5, /* Protocol mismatch */
197 PORT_CERR_DIRECTION = 6, /* Data direction mismatch */
198 PORT_CERR_UNDERRUN = 7, /* Ran out of SGEs while writing */
199 PORT_CERR_OVERRUN = 8, /* Ran out of SGEs while reading */
200 PORT_CERR_PKT_PROT = 11, /* DIR invalid in 1st PIO setup of ATAPI */
201 PORT_CERR_SGT_BOUNDARY = 16, /* PLD ecode 00 - SGT not on qword boundary */
202 PORT_CERR_SGT_TGTABRT = 17, /* PLD ecode 01 - target abort */
203 PORT_CERR_SGT_MSTABRT = 18, /* PLD ecode 10 - master abort */
204 PORT_CERR_SGT_PCIPERR = 19, /* PLD ecode 11 - PCI parity err while fetching SGT */
205 PORT_CERR_CMD_BOUNDARY = 24, /* ctrl[15:13] 001 - PRB not on qword boundary */
206 PORT_CERR_CMD_TGTABRT = 25, /* ctrl[15:13] 010 - target abort */
207 PORT_CERR_CMD_MSTABRT = 26, /* ctrl[15:13] 100 - master abort */
208 PORT_CERR_CMD_PCIPERR = 27, /* ctrl[15:13] 110 - PCI parity err while fetching PRB */
209 PORT_CERR_XFR_UNDEF = 32, /* PSD ecode 00 - undefined */
210 PORT_CERR_XFR_TGTABRT = 33, /* PSD ecode 01 - target abort */
211 PORT_CERR_XFR_MSTABRT = 34, /* PSD ecode 10 - master abort */
212 PORT_CERR_XFR_PCIPERR = 35, /* PSD ecode 11 - PCI prity err during transfer */
213 PORT_CERR_SENDSERVICE = 36, /* FIS received while sending service */
214
215 /* bits of PRB control field */
216 PRB_CTRL_PROTOCOL = (1 << 0), /* override def. ATA protocol */
217 PRB_CTRL_PACKET_READ = (1 << 4), /* PACKET cmd read */
218 PRB_CTRL_PACKET_WRITE = (1 << 5), /* PACKET cmd write */
219 PRB_CTRL_NIEN = (1 << 6), /* Mask completion irq */
220 PRB_CTRL_SRST = (1 << 7), /* Soft reset request (ign BSY?) */
221
222 /* PRB protocol field */
223 PRB_PROT_PACKET = (1 << 0),
224 PRB_PROT_TCQ = (1 << 1),
225 PRB_PROT_NCQ = (1 << 2),
226 PRB_PROT_READ = (1 << 3),
227 PRB_PROT_WRITE = (1 << 4),
228 PRB_PROT_TRANSPARENT = (1 << 5),
229
230 /*
231 * Other constants
232 */
233 SGE_TRM = (1 << 31), /* Last SGE in chain */
234 SGE_LNK = (1 << 30), /* linked list
235 Points to SGT, not SGE */
236 SGE_DRD = (1 << 29), /* discard data read (/dev/null)
237 data address ignored */
238
239 SIL24_MAX_CMDS = 31,
240
241 /* board id */
242 BID_SIL3124 = 0,
243 BID_SIL3132 = 1,
244 BID_SIL3131 = 2,
245
246 /* host flags */
247 SIL24_COMMON_FLAGS = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA |
248 ATA_FLAG_NCQ | ATA_FLAG_ACPI_SATA |
249 ATA_FLAG_AN | ATA_FLAG_PMP,
250 SIL24_FLAG_PCIX_IRQ_WOC = (1 << 24), /* IRQ loss errata on PCI-X */
251
252 IRQ_STAT_4PORTS = 0xf,
253 };
254
255 struct sil24_ata_block {
256 struct sil24_prb prb;
257 struct sil24_sge sge[SIL24_MAX_SGE];
258 };
259
260 struct sil24_atapi_block {
261 struct sil24_prb prb;
262 u8 cdb[16];
263 struct sil24_sge sge[SIL24_MAX_SGE];
264 };
265
266 union sil24_cmd_block {
267 struct sil24_ata_block ata;
268 struct sil24_atapi_block atapi;
269 };
270
271 static struct sil24_cerr_info {
272 unsigned int err_mask, action;
273 const char *desc;
274 } sil24_cerr_db[] = {
275 [0] = { AC_ERR_DEV, 0,
276 "device error" },
277 [PORT_CERR_DEV] = { AC_ERR_DEV, 0,
278 "device error via D2H FIS" },
279 [PORT_CERR_SDB] = { AC_ERR_DEV, 0,
280 "device error via SDB FIS" },
281 [PORT_CERR_DATA] = { AC_ERR_ATA_BUS, ATA_EH_RESET,
282 "error in data FIS" },
283 [PORT_CERR_SEND] = { AC_ERR_ATA_BUS, ATA_EH_RESET,
284 "failed to transmit command FIS" },
285 [PORT_CERR_INCONSISTENT] = { AC_ERR_HSM, ATA_EH_RESET,
286 "protocol mismatch" },
287 [PORT_CERR_DIRECTION] = { AC_ERR_HSM, ATA_EH_RESET,
288 "data directon mismatch" },
289 [PORT_CERR_UNDERRUN] = { AC_ERR_HSM, ATA_EH_RESET,
290 "ran out of SGEs while writing" },
291 [PORT_CERR_OVERRUN] = { AC_ERR_HSM, ATA_EH_RESET,
292 "ran out of SGEs while reading" },
293 [PORT_CERR_PKT_PROT] = { AC_ERR_HSM, ATA_EH_RESET,
294 "invalid data directon for ATAPI CDB" },
295 [PORT_CERR_SGT_BOUNDARY] = { AC_ERR_SYSTEM, ATA_EH_RESET,
296 "SGT not on qword boundary" },
297 [PORT_CERR_SGT_TGTABRT] = { AC_ERR_HOST_BUS, ATA_EH_RESET,
298 "PCI target abort while fetching SGT" },
299 [PORT_CERR_SGT_MSTABRT] = { AC_ERR_HOST_BUS, ATA_EH_RESET,
300 "PCI master abort while fetching SGT" },
301 [PORT_CERR_SGT_PCIPERR] = { AC_ERR_HOST_BUS, ATA_EH_RESET,
302 "PCI parity error while fetching SGT" },
303 [PORT_CERR_CMD_BOUNDARY] = { AC_ERR_SYSTEM, ATA_EH_RESET,
304 "PRB not on qword boundary" },
305 [PORT_CERR_CMD_TGTABRT] = { AC_ERR_HOST_BUS, ATA_EH_RESET,
306 "PCI target abort while fetching PRB" },
307 [PORT_CERR_CMD_MSTABRT] = { AC_ERR_HOST_BUS, ATA_EH_RESET,
308 "PCI master abort while fetching PRB" },
309 [PORT_CERR_CMD_PCIPERR] = { AC_ERR_HOST_BUS, ATA_EH_RESET,
310 "PCI parity error while fetching PRB" },
311 [PORT_CERR_XFR_UNDEF] = { AC_ERR_HOST_BUS, ATA_EH_RESET,
312 "undefined error while transferring data" },
313 [PORT_CERR_XFR_TGTABRT] = { AC_ERR_HOST_BUS, ATA_EH_RESET,
314 "PCI target abort while transferring data" },
315 [PORT_CERR_XFR_MSTABRT] = { AC_ERR_HOST_BUS, ATA_EH_RESET,
316 "PCI master abort while transferring data" },
317 [PORT_CERR_XFR_PCIPERR] = { AC_ERR_HOST_BUS, ATA_EH_RESET,
318 "PCI parity error while transferring data" },
319 [PORT_CERR_SENDSERVICE] = { AC_ERR_HSM, ATA_EH_RESET,
320 "FIS received while sending service FIS" },
321 };
322
323 /*
324 * ap->private_data
325 *
326 * The preview driver always returned 0 for status. We emulate it
327 * here from the previous interrupt.
328 */
329 struct sil24_port_priv {
330 union sil24_cmd_block *cmd_block; /* 32 cmd blocks */
331 dma_addr_t cmd_block_dma; /* DMA base addr for them */
332 int do_port_rst;
333 };
334
335 static void sil24_dev_config(struct ata_device *dev);
336 static int sil24_scr_read(struct ata_link *link, unsigned sc_reg, u32 *val);
337 static int sil24_scr_write(struct ata_link *link, unsigned sc_reg, u32 val);
338 static int sil24_qc_defer(struct ata_queued_cmd *qc);
339 static void sil24_qc_prep(struct ata_queued_cmd *qc);
340 static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc);
341 static bool sil24_qc_fill_rtf(struct ata_queued_cmd *qc);
342 static void sil24_pmp_attach(struct ata_port *ap);
343 static void sil24_pmp_detach(struct ata_port *ap);
344 static void sil24_freeze(struct ata_port *ap);
345 static void sil24_thaw(struct ata_port *ap);
346 static int sil24_softreset(struct ata_link *link, unsigned int *class,
347 unsigned long deadline);
348 static int sil24_hardreset(struct ata_link *link, unsigned int *class,
349 unsigned long deadline);
350 static int sil24_pmp_hardreset(struct ata_link *link, unsigned int *class,
351 unsigned long deadline);
352 static void sil24_error_handler(struct ata_port *ap);
353 static void sil24_post_internal_cmd(struct ata_queued_cmd *qc);
354 static int sil24_port_start(struct ata_port *ap);
355 static int sil24_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
356 #ifdef CONFIG_PM
357 static int sil24_pci_device_resume(struct pci_dev *pdev);
358 static int sil24_port_resume(struct ata_port *ap);
359 #endif
360
361 static const struct pci_device_id sil24_pci_tbl[] = {
362 { PCI_VDEVICE(CMD, 0x3124), BID_SIL3124 },
363 { PCI_VDEVICE(INTEL, 0x3124), BID_SIL3124 },
364 { PCI_VDEVICE(CMD, 0x3132), BID_SIL3132 },
365 { PCI_VDEVICE(CMD, 0x0242), BID_SIL3132 },
366 { PCI_VDEVICE(CMD, 0x0244), BID_SIL3132 },
367 { PCI_VDEVICE(CMD, 0x3131), BID_SIL3131 },
368 { PCI_VDEVICE(CMD, 0x3531), BID_SIL3131 },
369
370 { } /* terminate list */
371 };
372
373 static struct pci_driver sil24_pci_driver = {
374 .name = DRV_NAME,
375 .id_table = sil24_pci_tbl,
376 .probe = sil24_init_one,
377 .remove = ata_pci_remove_one,
378 #ifdef CONFIG_PM
379 .suspend = ata_pci_device_suspend,
380 .resume = sil24_pci_device_resume,
381 #endif
382 };
383
384 static struct scsi_host_template sil24_sht = {
385 ATA_NCQ_SHT(DRV_NAME),
386 .can_queue = SIL24_MAX_CMDS,
387 .sg_tablesize = SIL24_MAX_SGE,
388 .dma_boundary = ATA_DMA_BOUNDARY,
389 };
390
391 static struct ata_port_operations sil24_ops = {
392 .inherits = &sata_pmp_port_ops,
393
394 .qc_defer = sil24_qc_defer,
395 .qc_prep = sil24_qc_prep,
396 .qc_issue = sil24_qc_issue,
397 .qc_fill_rtf = sil24_qc_fill_rtf,
398
399 .freeze = sil24_freeze,
400 .thaw = sil24_thaw,
401 .softreset = sil24_softreset,
402 .hardreset = sil24_hardreset,
403 .pmp_softreset = sil24_softreset,
404 .pmp_hardreset = sil24_pmp_hardreset,
405 .error_handler = sil24_error_handler,
406 .post_internal_cmd = sil24_post_internal_cmd,
407 .dev_config = sil24_dev_config,
408
409 .scr_read = sil24_scr_read,
410 .scr_write = sil24_scr_write,
411 .pmp_attach = sil24_pmp_attach,
412 .pmp_detach = sil24_pmp_detach,
413
414 .port_start = sil24_port_start,
415 #ifdef CONFIG_PM
416 .port_resume = sil24_port_resume,
417 #endif
418 };
419
420 static int sata_sil24_msi; /* Disable MSI */
421 module_param_named(msi, sata_sil24_msi, bool, S_IRUGO);
422 MODULE_PARM_DESC(msi, "Enable MSI (Default: false)");
423
424 /*
425 * Use bits 30-31 of port_flags to encode available port numbers.
426 * Current maxium is 4.
427 */
428 #define SIL24_NPORTS2FLAG(nports) ((((unsigned)(nports) - 1) & 0x3) << 30)
429 #define SIL24_FLAG2NPORTS(flag) ((((flag) >> 30) & 0x3) + 1)
430
431 static const struct ata_port_info sil24_port_info[] = {
432 /* sil_3124 */
433 {
434 .flags = SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(4) |
435 SIL24_FLAG_PCIX_IRQ_WOC,
436 .pio_mask = ATA_PIO4,
437 .mwdma_mask = ATA_MWDMA2,
438 .udma_mask = ATA_UDMA5,
439 .port_ops = &sil24_ops,
440 },
441 /* sil_3132 */
442 {
443 .flags = SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(2),
444 .pio_mask = ATA_PIO4,
445 .mwdma_mask = ATA_MWDMA2,
446 .udma_mask = ATA_UDMA5,
447 .port_ops = &sil24_ops,
448 },
449 /* sil_3131/sil_3531 */
450 {
451 .flags = SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(1),
452 .pio_mask = ATA_PIO4,
453 .mwdma_mask = ATA_MWDMA2,
454 .udma_mask = ATA_UDMA5,
455 .port_ops = &sil24_ops,
456 },
457 };
458
459 static int sil24_tag(int tag)
460 {
461 if (unlikely(ata_tag_internal(tag)))
462 return 0;
463 return tag;
464 }
465
466 static unsigned long sil24_port_offset(struct ata_port *ap)
467 {
468 return ap->port_no * PORT_REGS_SIZE;
469 }
470
471 static void __iomem *sil24_port_base(struct ata_port *ap)
472 {
473 return ap->host->iomap[SIL24_PORT_BAR] + sil24_port_offset(ap);
474 }
475
476 static void sil24_dev_config(struct ata_device *dev)
477 {
478 void __iomem *port = sil24_port_base(dev->link->ap);
479
480 if (dev->cdb_len == 16)
481 writel(PORT_CS_CDB16, port + PORT_CTRL_STAT);
482 else
483 writel(PORT_CS_CDB16, port + PORT_CTRL_CLR);
484 }
485
486 static void sil24_read_tf(struct ata_port *ap, int tag, struct ata_taskfile *tf)
487 {
488 void __iomem *port = sil24_port_base(ap);
489 struct sil24_prb __iomem *prb;
490 u8 fis[6 * 4];
491
492 prb = port + PORT_LRAM + sil24_tag(tag) * PORT_LRAM_SLOT_SZ;
493 memcpy_fromio(fis, prb->fis, sizeof(fis));
494 ata_tf_from_fis(fis, tf);
495 }
496
497 static int sil24_scr_map[] = {
498 [SCR_CONTROL] = 0,
499 [SCR_STATUS] = 1,
500 [SCR_ERROR] = 2,
501 [SCR_ACTIVE] = 3,
502 };
503
504 static int sil24_scr_read(struct ata_link *link, unsigned sc_reg, u32 *val)
505 {
506 void __iomem *scr_addr = sil24_port_base(link->ap) + PORT_SCONTROL;
507
508 if (sc_reg < ARRAY_SIZE(sil24_scr_map)) {
509 void __iomem *addr;
510 addr = scr_addr + sil24_scr_map[sc_reg] * 4;
511 *val = readl(scr_addr + sil24_scr_map[sc_reg] * 4);
512 return 0;
513 }
514 return -EINVAL;
515 }
516
517 static int sil24_scr_write(struct ata_link *link, unsigned sc_reg, u32 val)
518 {
519 void __iomem *scr_addr = sil24_port_base(link->ap) + PORT_SCONTROL;
520
521 if (sc_reg < ARRAY_SIZE(sil24_scr_map)) {
522 void __iomem *addr;
523 addr = scr_addr + sil24_scr_map[sc_reg] * 4;
524 writel(val, scr_addr + sil24_scr_map[sc_reg] * 4);
525 return 0;
526 }
527 return -EINVAL;
528 }
529
530 static void sil24_config_port(struct ata_port *ap)
531 {
532 void __iomem *port = sil24_port_base(ap);
533
534 /* configure IRQ WoC */
535 if (ap->flags & SIL24_FLAG_PCIX_IRQ_WOC)
536 writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_STAT);
537 else
538 writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_CLR);
539
540 /* zero error counters. */
541 writew(0x8000, port + PORT_DECODE_ERR_THRESH);
542 writew(0x8000, port + PORT_CRC_ERR_THRESH);
543 writew(0x8000, port + PORT_HSHK_ERR_THRESH);
544 writew(0x0000, port + PORT_DECODE_ERR_CNT);
545 writew(0x0000, port + PORT_CRC_ERR_CNT);
546 writew(0x0000, port + PORT_HSHK_ERR_CNT);
547
548 /* always use 64bit activation */
549 writel(PORT_CS_32BIT_ACTV, port + PORT_CTRL_CLR);
550
551 /* clear port multiplier enable and resume bits */
552 writel(PORT_CS_PMP_EN | PORT_CS_PMP_RESUME, port + PORT_CTRL_CLR);
553 }
554
555 static void sil24_config_pmp(struct ata_port *ap, int attached)
556 {
557 void __iomem *port = sil24_port_base(ap);
558
559 if (attached)
560 writel(PORT_CS_PMP_EN, port + PORT_CTRL_STAT);
561 else
562 writel(PORT_CS_PMP_EN, port + PORT_CTRL_CLR);
563 }
564
565 static void sil24_clear_pmp(struct ata_port *ap)
566 {
567 void __iomem *port = sil24_port_base(ap);
568 int i;
569
570 writel(PORT_CS_PMP_RESUME, port + PORT_CTRL_CLR);
571
572 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) {
573 void __iomem *pmp_base = port + PORT_PMP + i * PORT_PMP_SIZE;
574
575 writel(0, pmp_base + PORT_PMP_STATUS);
576 writel(0, pmp_base + PORT_PMP_QACTIVE);
577 }
578 }
579
580 static int sil24_init_port(struct ata_port *ap)
581 {
582 void __iomem *port = sil24_port_base(ap);
583 struct sil24_port_priv *pp = ap->private_data;
584 u32 tmp;
585
586 /* clear PMP error status */
587 if (sata_pmp_attached(ap))
588 sil24_clear_pmp(ap);
589
590 writel(PORT_CS_INIT, port + PORT_CTRL_STAT);
591 ata_wait_register(ap, port + PORT_CTRL_STAT,
592 PORT_CS_INIT, PORT_CS_INIT, 10, 100);
593 tmp = ata_wait_register(ap, port + PORT_CTRL_STAT,
594 PORT_CS_RDY, 0, 10, 100);
595
596 if ((tmp & (PORT_CS_INIT | PORT_CS_RDY)) != PORT_CS_RDY) {
597 pp->do_port_rst = 1;
598 ap->link.eh_context.i.action |= ATA_EH_RESET;
599 return -EIO;
600 }
601
602 return 0;
603 }
604
605 static int sil24_exec_polled_cmd(struct ata_port *ap, int pmp,
606 const struct ata_taskfile *tf,
607 int is_cmd, u32 ctrl,
608 unsigned long timeout_msec)
609 {
610 void __iomem *port = sil24_port_base(ap);
611 struct sil24_port_priv *pp = ap->private_data;
612 struct sil24_prb *prb = &pp->cmd_block[0].ata.prb;
613 dma_addr_t paddr = pp->cmd_block_dma;
614 u32 irq_enabled, irq_mask, irq_stat;
615 int rc;
616
617 prb->ctrl = cpu_to_le16(ctrl);
618 ata_tf_to_fis(tf, pmp, is_cmd, prb->fis);
619
620 /* temporarily plug completion and error interrupts */
621 irq_enabled = readl(port + PORT_IRQ_ENABLE_SET);
622 writel(PORT_IRQ_COMPLETE | PORT_IRQ_ERROR, port + PORT_IRQ_ENABLE_CLR);
623
624 /*
625 * The barrier is required to ensure that writes to cmd_block reach
626 * the memory before the write to PORT_CMD_ACTIVATE.
627 */
628 wmb();
629 writel((u32)paddr, port + PORT_CMD_ACTIVATE);
630 writel((u64)paddr >> 32, port + PORT_CMD_ACTIVATE + 4);
631
632 irq_mask = (PORT_IRQ_COMPLETE | PORT_IRQ_ERROR) << PORT_IRQ_RAW_SHIFT;
633 irq_stat = ata_wait_register(ap, port + PORT_IRQ_STAT, irq_mask, 0x0,
634 10, timeout_msec);
635
636 writel(irq_mask, port + PORT_IRQ_STAT); /* clear IRQs */
637 irq_stat >>= PORT_IRQ_RAW_SHIFT;
638
639 if (irq_stat & PORT_IRQ_COMPLETE)
640 rc = 0;
641 else {
642 /* force port into known state */
643 sil24_init_port(ap);
644
645 if (irq_stat & PORT_IRQ_ERROR)
646 rc = -EIO;
647 else
648 rc = -EBUSY;
649 }
650
651 /* restore IRQ enabled */
652 writel(irq_enabled, port + PORT_IRQ_ENABLE_SET);
653
654 return rc;
655 }
656
657 static int sil24_softreset(struct ata_link *link, unsigned int *class,
658 unsigned long deadline)
659 {
660 struct ata_port *ap = link->ap;
661 int pmp = sata_srst_pmp(link);
662 unsigned long timeout_msec = 0;
663 struct ata_taskfile tf;
664 const char *reason;
665 int rc;
666
667 DPRINTK("ENTER\n");
668
669 /* put the port into known state */
670 if (sil24_init_port(ap)) {
671 reason = "port not ready";
672 goto err;
673 }
674
675 /* do SRST */
676 if (time_after(deadline, jiffies))
677 timeout_msec = jiffies_to_msecs(deadline - jiffies);
678
679 ata_tf_init(link->device, &tf); /* doesn't really matter */
680 rc = sil24_exec_polled_cmd(ap, pmp, &tf, 0, PRB_CTRL_SRST,
681 timeout_msec);
682 if (rc == -EBUSY) {
683 reason = "timeout";
684 goto err;
685 } else if (rc) {
686 reason = "SRST command error";
687 goto err;
688 }
689
690 sil24_read_tf(ap, 0, &tf);
691 *class = ata_dev_classify(&tf);
692
693 DPRINTK("EXIT, class=%u\n", *class);
694 return 0;
695
696 err:
697 ata_link_printk(link, KERN_ERR, "softreset failed (%s)\n", reason);
698 return -EIO;
699 }
700
701 static int sil24_hardreset(struct ata_link *link, unsigned int *class,
702 unsigned long deadline)
703 {
704 struct ata_port *ap = link->ap;
705 void __iomem *port = sil24_port_base(ap);
706 struct sil24_port_priv *pp = ap->private_data;
707 int did_port_rst = 0;
708 const char *reason;
709 int tout_msec, rc;
710 u32 tmp;
711
712 retry:
713 /* Sometimes, DEV_RST is not enough to recover the controller.
714 * This happens often after PM DMA CS errata.
715 */
716 if (pp->do_port_rst) {
717 ata_port_printk(ap, KERN_WARNING, "controller in dubious "
718 "state, performing PORT_RST\n");
719
720 writel(PORT_CS_PORT_RST, port + PORT_CTRL_STAT);
721 ata_msleep(ap, 10);
722 writel(PORT_CS_PORT_RST, port + PORT_CTRL_CLR);
723 ata_wait_register(ap, port + PORT_CTRL_STAT, PORT_CS_RDY, 0,
724 10, 5000);
725
726 /* restore port configuration */
727 sil24_config_port(ap);
728 sil24_config_pmp(ap, ap->nr_pmp_links);
729
730 pp->do_port_rst = 0;
731 did_port_rst = 1;
732 }
733
734 /* sil24 does the right thing(tm) without any protection */
735 sata_set_spd(link);
736
737 tout_msec = 100;
738 if (ata_link_online(link))
739 tout_msec = 5000;
740
741 writel(PORT_CS_DEV_RST, port + PORT_CTRL_STAT);
742 tmp = ata_wait_register(ap, port + PORT_CTRL_STAT,
743 PORT_CS_DEV_RST, PORT_CS_DEV_RST, 10,
744 tout_msec);
745
746 /* SStatus oscillates between zero and valid status after
747 * DEV_RST, debounce it.
748 */
749 rc = sata_link_debounce(link, sata_deb_timing_long, deadline);
750 if (rc) {
751 reason = "PHY debouncing failed";
752 goto err;
753 }
754
755 if (tmp & PORT_CS_DEV_RST) {
756 if (ata_link_offline(link))
757 return 0;
758 reason = "link not ready";
759 goto err;
760 }
761
762 /* Sil24 doesn't store signature FIS after hardreset, so we
763 * can't wait for BSY to clear. Some devices take a long time
764 * to get ready and those devices will choke if we don't wait
765 * for BSY clearance here. Tell libata to perform follow-up
766 * softreset.
767 */
768 return -EAGAIN;
769
770 err:
771 if (!did_port_rst) {
772 pp->do_port_rst = 1;
773 goto retry;
774 }
775
776 ata_link_printk(link, KERN_ERR, "hardreset failed (%s)\n", reason);
777 return -EIO;
778 }
779
780 static inline void sil24_fill_sg(struct ata_queued_cmd *qc,
781 struct sil24_sge *sge)
782 {
783 struct scatterlist *sg;
784 struct sil24_sge *last_sge = NULL;
785 unsigned int si;
786
787 for_each_sg(qc->sg, sg, qc->n_elem, si) {
788 sge->addr = cpu_to_le64(sg_dma_address(sg));
789 sge->cnt = cpu_to_le32(sg_dma_len(sg));
790 sge->flags = 0;
791
792 last_sge = sge;
793 sge++;
794 }
795
796 last_sge->flags = cpu_to_le32(SGE_TRM);
797 }
798
799 static int sil24_qc_defer(struct ata_queued_cmd *qc)
800 {
801 struct ata_link *link = qc->dev->link;
802 struct ata_port *ap = link->ap;
803 u8 prot = qc->tf.protocol;
804
805 /*
806 * There is a bug in the chip:
807 * Port LRAM Causes the PRB/SGT Data to be Corrupted
808 * If the host issues a read request for LRAM and SActive registers
809 * while active commands are available in the port, PRB/SGT data in
810 * the LRAM can become corrupted. This issue applies only when
811 * reading from, but not writing to, the LRAM.
812 *
813 * Therefore, reading LRAM when there is no particular error [and
814 * other commands may be outstanding] is prohibited.
815 *
816 * To avoid this bug there are two situations where a command must run
817 * exclusive of any other commands on the port:
818 *
819 * - ATAPI commands which check the sense data
820 * - Passthrough ATA commands which always have ATA_QCFLAG_RESULT_TF
821 * set.
822 *
823 */
824 int is_excl = (ata_is_atapi(prot) ||
825 (qc->flags & ATA_QCFLAG_RESULT_TF));
826
827 if (unlikely(ap->excl_link)) {
828 if (link == ap->excl_link) {
829 if (ap->nr_active_links)
830 return ATA_DEFER_PORT;
831 qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
832 } else
833 return ATA_DEFER_PORT;
834 } else if (unlikely(is_excl)) {
835 ap->excl_link = link;
836 if (ap->nr_active_links)
837 return ATA_DEFER_PORT;
838 qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
839 }
840
841 return ata_std_qc_defer(qc);
842 }
843
844 static void sil24_qc_prep(struct ata_queued_cmd *qc)
845 {
846 struct ata_port *ap = qc->ap;
847 struct sil24_port_priv *pp = ap->private_data;
848 union sil24_cmd_block *cb;
849 struct sil24_prb *prb;
850 struct sil24_sge *sge;
851 u16 ctrl = 0;
852
853 cb = &pp->cmd_block[sil24_tag(qc->tag)];
854
855 if (!ata_is_atapi(qc->tf.protocol)) {
856 prb = &cb->ata.prb;
857 sge = cb->ata.sge;
858 if (ata_is_data(qc->tf.protocol)) {
859 u16 prot = 0;
860 ctrl = PRB_CTRL_PROTOCOL;
861 if (ata_is_ncq(qc->tf.protocol))
862 prot |= PRB_PROT_NCQ;
863 if (qc->tf.flags & ATA_TFLAG_WRITE)
864 prot |= PRB_PROT_WRITE;
865 else
866 prot |= PRB_PROT_READ;
867 prb->prot = cpu_to_le16(prot);
868 }
869 } else {
870 prb = &cb->atapi.prb;
871 sge = cb->atapi.sge;
872 memset(cb->atapi.cdb, 0, sizeof(cb->atapi.cdb));
873 memcpy(cb->atapi.cdb, qc->cdb, qc->dev->cdb_len);
874
875 if (ata_is_data(qc->tf.protocol)) {
876 if (qc->tf.flags & ATA_TFLAG_WRITE)
877 ctrl = PRB_CTRL_PACKET_WRITE;
878 else
879 ctrl = PRB_CTRL_PACKET_READ;
880 }
881 }
882
883 prb->ctrl = cpu_to_le16(ctrl);
884 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, prb->fis);
885
886 if (qc->flags & ATA_QCFLAG_DMAMAP)
887 sil24_fill_sg(qc, sge);
888 }
889
890 static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc)
891 {
892 struct ata_port *ap = qc->ap;
893 struct sil24_port_priv *pp = ap->private_data;
894 void __iomem *port = sil24_port_base(ap);
895 unsigned int tag = sil24_tag(qc->tag);
896 dma_addr_t paddr;
897 void __iomem *activate;
898
899 paddr = pp->cmd_block_dma + tag * sizeof(*pp->cmd_block);
900 activate = port + PORT_CMD_ACTIVATE + tag * 8;
901
902 /*
903 * The barrier is required to ensure that writes to cmd_block reach
904 * the memory before the write to PORT_CMD_ACTIVATE.
905 */
906 wmb();
907 writel((u32)paddr, activate);
908 writel((u64)paddr >> 32, activate + 4);
909
910 return 0;
911 }
912
913 static bool sil24_qc_fill_rtf(struct ata_queued_cmd *qc)
914 {
915 sil24_read_tf(qc->ap, qc->tag, &qc->result_tf);
916 return true;
917 }
918
919 static void sil24_pmp_attach(struct ata_port *ap)
920 {
921 u32 *gscr = ap->link.device->gscr;
922
923 sil24_config_pmp(ap, 1);
924 sil24_init_port(ap);
925
926 if (sata_pmp_gscr_vendor(gscr) == 0x11ab &&
927 sata_pmp_gscr_devid(gscr) == 0x4140) {
928 ata_port_printk(ap, KERN_INFO,
929 "disabling NCQ support due to sil24-mv4140 quirk\n");
930 ap->flags &= ~ATA_FLAG_NCQ;
931 }
932 }
933
934 static void sil24_pmp_detach(struct ata_port *ap)
935 {
936 sil24_init_port(ap);
937 sil24_config_pmp(ap, 0);
938
939 ap->flags |= ATA_FLAG_NCQ;
940 }
941
942 static int sil24_pmp_hardreset(struct ata_link *link, unsigned int *class,
943 unsigned long deadline)
944 {
945 int rc;
946
947 rc = sil24_init_port(link->ap);
948 if (rc) {
949 ata_link_printk(link, KERN_ERR,
950 "hardreset failed (port not ready)\n");
951 return rc;
952 }
953
954 return sata_std_hardreset(link, class, deadline);
955 }
956
957 static void sil24_freeze(struct ata_port *ap)
958 {
959 void __iomem *port = sil24_port_base(ap);
960
961 /* Port-wide IRQ mask in HOST_CTRL doesn't really work, clear
962 * PORT_IRQ_ENABLE instead.
963 */
964 writel(0xffff, port + PORT_IRQ_ENABLE_CLR);
965 }
966
967 static void sil24_thaw(struct ata_port *ap)
968 {
969 void __iomem *port = sil24_port_base(ap);
970 u32 tmp;
971
972 /* clear IRQ */
973 tmp = readl(port + PORT_IRQ_STAT);
974 writel(tmp, port + PORT_IRQ_STAT);
975
976 /* turn IRQ back on */
977 writel(DEF_PORT_IRQ, port + PORT_IRQ_ENABLE_SET);
978 }
979
980 static void sil24_error_intr(struct ata_port *ap)
981 {
982 void __iomem *port = sil24_port_base(ap);
983 struct sil24_port_priv *pp = ap->private_data;
984 struct ata_queued_cmd *qc = NULL;
985 struct ata_link *link;
986 struct ata_eh_info *ehi;
987 int abort = 0, freeze = 0;
988 u32 irq_stat;
989
990 /* on error, we need to clear IRQ explicitly */
991 irq_stat = readl(port + PORT_IRQ_STAT);
992 writel(irq_stat, port + PORT_IRQ_STAT);
993
994 /* first, analyze and record host port events */
995 link = &ap->link;
996 ehi = &link->eh_info;
997 ata_ehi_clear_desc(ehi);
998
999 ata_ehi_push_desc(ehi, "irq_stat 0x%08x", irq_stat);
1000
1001 if (irq_stat & PORT_IRQ_SDB_NOTIFY) {
1002 ata_ehi_push_desc(ehi, "SDB notify");
1003 sata_async_notification(ap);
1004 }
1005
1006 if (irq_stat & (PORT_IRQ_PHYRDY_CHG | PORT_IRQ_DEV_XCHG)) {
1007 ata_ehi_hotplugged(ehi);
1008 ata_ehi_push_desc(ehi, "%s",
1009 irq_stat & PORT_IRQ_PHYRDY_CHG ?
1010 "PHY RDY changed" : "device exchanged");
1011 freeze = 1;
1012 }
1013
1014 if (irq_stat & PORT_IRQ_UNK_FIS) {
1015 ehi->err_mask |= AC_ERR_HSM;
1016 ehi->action |= ATA_EH_RESET;
1017 ata_ehi_push_desc(ehi, "unknown FIS");
1018 freeze = 1;
1019 }
1020
1021 /* deal with command error */
1022 if (irq_stat & PORT_IRQ_ERROR) {
1023 struct sil24_cerr_info *ci = NULL;
1024 unsigned int err_mask = 0, action = 0;
1025 u32 context, cerr;
1026 int pmp;
1027
1028 abort = 1;
1029
1030 /* DMA Context Switch Failure in Port Multiplier Mode
1031 * errata. If we have active commands to 3 or more
1032 * devices, any error condition on active devices can
1033 * corrupt DMA context switching.
1034 */
1035 if (ap->nr_active_links >= 3) {
1036 ehi->err_mask |= AC_ERR_OTHER;
1037 ehi->action |= ATA_EH_RESET;
1038 ata_ehi_push_desc(ehi, "PMP DMA CS errata");
1039 pp->do_port_rst = 1;
1040 freeze = 1;
1041 }
1042
1043 /* find out the offending link and qc */
1044 if (sata_pmp_attached(ap)) {
1045 context = readl(port + PORT_CONTEXT);
1046 pmp = (context >> 5) & 0xf;
1047
1048 if (pmp < ap->nr_pmp_links) {
1049 link = &ap->pmp_link[pmp];
1050 ehi = &link->eh_info;
1051 qc = ata_qc_from_tag(ap, link->active_tag);
1052
1053 ata_ehi_clear_desc(ehi);
1054 ata_ehi_push_desc(ehi, "irq_stat 0x%08x",
1055 irq_stat);
1056 } else {
1057 err_mask |= AC_ERR_HSM;
1058 action |= ATA_EH_RESET;
1059 freeze = 1;
1060 }
1061 } else
1062 qc = ata_qc_from_tag(ap, link->active_tag);
1063
1064 /* analyze CMD_ERR */
1065 cerr = readl(port + PORT_CMD_ERR);
1066 if (cerr < ARRAY_SIZE(sil24_cerr_db))
1067 ci = &sil24_cerr_db[cerr];
1068
1069 if (ci && ci->desc) {
1070 err_mask |= ci->err_mask;
1071 action |= ci->action;
1072 if (action & ATA_EH_RESET)
1073 freeze = 1;
1074 ata_ehi_push_desc(ehi, "%s", ci->desc);
1075 } else {
1076 err_mask |= AC_ERR_OTHER;
1077 action |= ATA_EH_RESET;
1078 freeze = 1;
1079 ata_ehi_push_desc(ehi, "unknown command error %d",
1080 cerr);
1081 }
1082
1083 /* record error info */
1084 if (qc)
1085 qc->err_mask |= err_mask;
1086 else
1087 ehi->err_mask |= err_mask;
1088
1089 ehi->action |= action;
1090
1091 /* if PMP, resume */
1092 if (sata_pmp_attached(ap))
1093 writel(PORT_CS_PMP_RESUME, port + PORT_CTRL_STAT);
1094 }
1095
1096 /* freeze or abort */
1097 if (freeze)
1098 ata_port_freeze(ap);
1099 else if (abort) {
1100 if (qc)
1101 ata_link_abort(qc->dev->link);
1102 else
1103 ata_port_abort(ap);
1104 }
1105 }
1106
1107 static inline void sil24_host_intr(struct ata_port *ap)
1108 {
1109 void __iomem *port = sil24_port_base(ap);
1110 u32 slot_stat, qc_active;
1111 int rc;
1112
1113 /* If PCIX_IRQ_WOC, there's an inherent race window between
1114 * clearing IRQ pending status and reading PORT_SLOT_STAT
1115 * which may cause spurious interrupts afterwards. This is
1116 * unavoidable and much better than losing interrupts which
1117 * happens if IRQ pending is cleared after reading
1118 * PORT_SLOT_STAT.
1119 */
1120 if (ap->flags & SIL24_FLAG_PCIX_IRQ_WOC)
1121 writel(PORT_IRQ_COMPLETE, port + PORT_IRQ_STAT);
1122
1123 slot_stat = readl(port + PORT_SLOT_STAT);
1124
1125 if (unlikely(slot_stat & HOST_SSTAT_ATTN)) {
1126 sil24_error_intr(ap);
1127 return;
1128 }
1129
1130 qc_active = slot_stat & ~HOST_SSTAT_ATTN;
1131 rc = ata_qc_complete_multiple(ap, qc_active);
1132 if (rc > 0)
1133 return;
1134 if (rc < 0) {
1135 struct ata_eh_info *ehi = &ap->link.eh_info;
1136 ehi->err_mask |= AC_ERR_HSM;
1137 ehi->action |= ATA_EH_RESET;
1138 ata_port_freeze(ap);
1139 return;
1140 }
1141
1142 /* spurious interrupts are expected if PCIX_IRQ_WOC */
1143 if (!(ap->flags & SIL24_FLAG_PCIX_IRQ_WOC) && ata_ratelimit())
1144 ata_port_printk(ap, KERN_INFO, "spurious interrupt "
1145 "(slot_stat 0x%x active_tag %d sactive 0x%x)\n",
1146 slot_stat, ap->link.active_tag, ap->link.sactive);
1147 }
1148
1149 static irqreturn_t sil24_interrupt(int irq, void *dev_instance)
1150 {
1151 struct ata_host *host = dev_instance;
1152 void __iomem *host_base = host->iomap[SIL24_HOST_BAR];
1153 unsigned handled = 0;
1154 u32 status;
1155 int i;
1156
1157 status = readl(host_base + HOST_IRQ_STAT);
1158
1159 if (status == 0xffffffff) {
1160 printk(KERN_ERR DRV_NAME ": IRQ status == 0xffffffff, "
1161 "PCI fault or device removal?\n");
1162 goto out;
1163 }
1164
1165 if (!(status & IRQ_STAT_4PORTS))
1166 goto out;
1167
1168 spin_lock(&host->lock);
1169
1170 for (i = 0; i < host->n_ports; i++)
1171 if (status & (1 << i)) {
1172 sil24_host_intr(host->ports[i]);
1173 handled++;
1174 }
1175
1176 spin_unlock(&host->lock);
1177 out:
1178 return IRQ_RETVAL(handled);
1179 }
1180
1181 static void sil24_error_handler(struct ata_port *ap)
1182 {
1183 struct sil24_port_priv *pp = ap->private_data;
1184
1185 if (sil24_init_port(ap))
1186 ata_eh_freeze_port(ap);
1187
1188 sata_pmp_error_handler(ap);
1189
1190 pp->do_port_rst = 0;
1191 }
1192
1193 static void sil24_post_internal_cmd(struct ata_queued_cmd *qc)
1194 {
1195 struct ata_port *ap = qc->ap;
1196
1197 /* make DMA engine forget about the failed command */
1198 if ((qc->flags & ATA_QCFLAG_FAILED) && sil24_init_port(ap))
1199 ata_eh_freeze_port(ap);
1200 }
1201
1202 static int sil24_port_start(struct ata_port *ap)
1203 {
1204 struct device *dev = ap->host->dev;
1205 struct sil24_port_priv *pp;
1206 union sil24_cmd_block *cb;
1207 size_t cb_size = sizeof(*cb) * SIL24_MAX_CMDS;
1208 dma_addr_t cb_dma;
1209
1210 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
1211 if (!pp)
1212 return -ENOMEM;
1213
1214 cb = dmam_alloc_coherent(dev, cb_size, &cb_dma, GFP_KERNEL);
1215 if (!cb)
1216 return -ENOMEM;
1217 memset(cb, 0, cb_size);
1218
1219 pp->cmd_block = cb;
1220 pp->cmd_block_dma = cb_dma;
1221
1222 ap->private_data = pp;
1223
1224 ata_port_pbar_desc(ap, SIL24_HOST_BAR, -1, "host");
1225 ata_port_pbar_desc(ap, SIL24_PORT_BAR, sil24_port_offset(ap), "port");
1226
1227 return 0;
1228 }
1229
1230 static void sil24_init_controller(struct ata_host *host)
1231 {
1232 void __iomem *host_base = host->iomap[SIL24_HOST_BAR];
1233 u32 tmp;
1234 int i;
1235
1236 /* GPIO off */
1237 writel(0, host_base + HOST_FLASH_CMD);
1238
1239 /* clear global reset & mask interrupts during initialization */
1240 writel(0, host_base + HOST_CTRL);
1241
1242 /* init ports */
1243 for (i = 0; i < host->n_ports; i++) {
1244 struct ata_port *ap = host->ports[i];
1245 void __iomem *port = sil24_port_base(ap);
1246
1247
1248 /* Initial PHY setting */
1249 writel(0x20c, port + PORT_PHY_CFG);
1250
1251 /* Clear port RST */
1252 tmp = readl(port + PORT_CTRL_STAT);
1253 if (tmp & PORT_CS_PORT_RST) {
1254 writel(PORT_CS_PORT_RST, port + PORT_CTRL_CLR);
1255 tmp = ata_wait_register(NULL, port + PORT_CTRL_STAT,
1256 PORT_CS_PORT_RST,
1257 PORT_CS_PORT_RST, 10, 100);
1258 if (tmp & PORT_CS_PORT_RST)
1259 dev_printk(KERN_ERR, host->dev,
1260 "failed to clear port RST\n");
1261 }
1262
1263 /* configure port */
1264 sil24_config_port(ap);
1265 }
1266
1267 /* Turn on interrupts */
1268 writel(IRQ_STAT_4PORTS, host_base + HOST_CTRL);
1269 }
1270
1271 static int sil24_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
1272 {
1273 extern int __MARKER__sil24_cmd_block_is_sized_wrongly;
1274 static int printed_version;
1275 struct ata_port_info pi = sil24_port_info[ent->driver_data];
1276 const struct ata_port_info *ppi[] = { &pi, NULL };
1277 void __iomem * const *iomap;
1278 struct ata_host *host;
1279 int rc;
1280 u32 tmp;
1281
1282 /* cause link error if sil24_cmd_block is sized wrongly */
1283 if (sizeof(union sil24_cmd_block) != PAGE_SIZE)
1284 __MARKER__sil24_cmd_block_is_sized_wrongly = 1;
1285
1286 if (!printed_version++)
1287 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
1288
1289 /* acquire resources */
1290 rc = pcim_enable_device(pdev);
1291 if (rc)
1292 return rc;
1293
1294 rc = pcim_iomap_regions(pdev,
1295 (1 << SIL24_HOST_BAR) | (1 << SIL24_PORT_BAR),
1296 DRV_NAME);
1297 if (rc)
1298 return rc;
1299 iomap = pcim_iomap_table(pdev);
1300
1301 /* apply workaround for completion IRQ loss on PCI-X errata */
1302 if (pi.flags & SIL24_FLAG_PCIX_IRQ_WOC) {
1303 tmp = readl(iomap[SIL24_HOST_BAR] + HOST_CTRL);
1304 if (tmp & (HOST_CTRL_TRDY | HOST_CTRL_STOP | HOST_CTRL_DEVSEL))
1305 dev_printk(KERN_INFO, &pdev->dev,
1306 "Applying completion IRQ loss on PCI-X "
1307 "errata fix\n");
1308 else
1309 pi.flags &= ~SIL24_FLAG_PCIX_IRQ_WOC;
1310 }
1311
1312 /* allocate and fill host */
1313 host = ata_host_alloc_pinfo(&pdev->dev, ppi,
1314 SIL24_FLAG2NPORTS(ppi[0]->flags));
1315 if (!host)
1316 return -ENOMEM;
1317 host->iomap = iomap;
1318
1319 /* configure and activate the device */
1320 if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
1321 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
1322 if (rc) {
1323 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
1324 if (rc) {
1325 dev_printk(KERN_ERR, &pdev->dev,
1326 "64-bit DMA enable failed\n");
1327 return rc;
1328 }
1329 }
1330 } else {
1331 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
1332 if (rc) {
1333 dev_printk(KERN_ERR, &pdev->dev,
1334 "32-bit DMA enable failed\n");
1335 return rc;
1336 }
1337 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
1338 if (rc) {
1339 dev_printk(KERN_ERR, &pdev->dev,
1340 "32-bit consistent DMA enable failed\n");
1341 return rc;
1342 }
1343 }
1344
1345 /* Set max read request size to 4096. This slightly increases
1346 * write throughput for pci-e variants.
1347 */
1348 pcie_set_readrq(pdev, 4096);
1349
1350 sil24_init_controller(host);
1351
1352 if (sata_sil24_msi && !pci_enable_msi(pdev)) {
1353 dev_printk(KERN_INFO, &pdev->dev, "Using MSI\n");
1354 pci_intx(pdev, 0);
1355 }
1356
1357 pci_set_master(pdev);
1358 return ata_host_activate(host, pdev->irq, sil24_interrupt, IRQF_SHARED,
1359 &sil24_sht);
1360 }
1361
1362 #ifdef CONFIG_PM
1363 static int sil24_pci_device_resume(struct pci_dev *pdev)
1364 {
1365 struct ata_host *host = dev_get_drvdata(&pdev->dev);
1366 void __iomem *host_base = host->iomap[SIL24_HOST_BAR];
1367 int rc;
1368
1369 rc = ata_pci_device_do_resume(pdev);
1370 if (rc)
1371 return rc;
1372
1373 if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND)
1374 writel(HOST_CTRL_GLOBAL_RST, host_base + HOST_CTRL);
1375
1376 sil24_init_controller(host);
1377
1378 ata_host_resume(host);
1379
1380 return 0;
1381 }
1382
1383 static int sil24_port_resume(struct ata_port *ap)
1384 {
1385 sil24_config_pmp(ap, ap->nr_pmp_links);
1386 return 0;
1387 }
1388 #endif
1389
1390 static int __init sil24_init(void)
1391 {
1392 return pci_register_driver(&sil24_pci_driver);
1393 }
1394
1395 static void __exit sil24_exit(void)
1396 {
1397 pci_unregister_driver(&sil24_pci_driver);
1398 }
1399
1400 MODULE_AUTHOR("Tejun Heo");
1401 MODULE_DESCRIPTION("Silicon Image 3124/3132 SATA low-level driver");
1402 MODULE_LICENSE("GPL");
1403 MODULE_DEVICE_TABLE(pci, sil24_pci_tbl);
1404
1405 module_init(sil24_init);
1406 module_exit(sil24_exit);
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