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CRISv32: add unreachable() to BUG()
[linux/fpc-iii.git] / drivers / ata / sata_dwc_460ex.c
blob902034991517347c6bbcb38f09fbdd99e63aaba3
1 /*
2 * drivers/ata/sata_dwc_460ex.c
3 *
4 * Synopsys DesignWare Cores (DWC) SATA host driver
5 *
6 * Author: Mark Miesfeld <mmiesfeld@amcc.com>
7 *
8 * Ported from 2.6.19.2 to 2.6.25/26 by Stefan Roese <sr@denx.de>
9 * Copyright 2008 DENX Software Engineering
10 *
11 * Based on versions provided by AMCC and Synopsys which are:
12 * Copyright 2006 Applied Micro Circuits Corporation
13 * COPYRIGHT (C) 2005 SYNOPSYS, INC. ALL RIGHTS RESERVED
14 *
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2 of the License, or (at your
18 * option) any later version.
19 */
20
21 #ifdef CONFIG_SATA_DWC_DEBUG
22 #define DEBUG
23 #endif
24
25 #ifdef CONFIG_SATA_DWC_VDEBUG
26 #define VERBOSE_DEBUG
27 #define DEBUG_NCQ
28 #endif
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/device.h>
33 #include <linux/of_address.h>
34 #include <linux/of_irq.h>
35 #include <linux/of_platform.h>
36 #include <linux/platform_device.h>
37 #include <linux/libata.h>
38 #include <linux/slab.h>
39
40 #include "libata.h"
41
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi_cmnd.h>
44
45 /* Supported DMA engine drivers */
46 #include <linux/platform_data/dma-dw.h>
47 #include <linux/dma/dw.h>
48
49 /* These two are defined in "libata.h" */
50 #undef DRV_NAME
51 #undef DRV_VERSION
52
53 #define DRV_NAME "sata-dwc"
54 #define DRV_VERSION "1.3"
55
56 #ifndef out_le32
57 #define out_le32(a, v) __raw_writel(__cpu_to_le32(v), (void __iomem *)(a))
58 #endif
59
60 #ifndef in_le32
61 #define in_le32(a) __le32_to_cpu(__raw_readl((void __iomem *)(a)))
62 #endif
63
64 #ifndef NO_IRQ
65 #define NO_IRQ 0
66 #endif
67
68 #define AHB_DMA_BRST_DFLT 64 /* 16 data items burst length*/
69
70 enum {
71 SATA_DWC_MAX_PORTS = 1,
72
73 SATA_DWC_SCR_OFFSET = 0x24,
74 SATA_DWC_REG_OFFSET = 0x64,
75 };
76
77 /* DWC SATA Registers */
78 struct sata_dwc_regs {
79 u32 fptagr; /* 1st party DMA tag */
80 u32 fpbor; /* 1st party DMA buffer offset */
81 u32 fptcr; /* 1st party DMA Xfr count */
82 u32 dmacr; /* DMA Control */
83 u32 dbtsr; /* DMA Burst Transac size */
84 u32 intpr; /* Interrupt Pending */
85 u32 intmr; /* Interrupt Mask */
86 u32 errmr; /* Error Mask */
87 u32 llcr; /* Link Layer Control */
88 u32 phycr; /* PHY Control */
89 u32 physr; /* PHY Status */
90 u32 rxbistpd; /* Recvd BIST pattern def register */
91 u32 rxbistpd1; /* Recvd BIST data dword1 */
92 u32 rxbistpd2; /* Recvd BIST pattern data dword2 */
93 u32 txbistpd; /* Trans BIST pattern def register */
94 u32 txbistpd1; /* Trans BIST data dword1 */
95 u32 txbistpd2; /* Trans BIST data dword2 */
96 u32 bistcr; /* BIST Control Register */
97 u32 bistfctr; /* BIST FIS Count Register */
98 u32 bistsr; /* BIST Status Register */
99 u32 bistdecr; /* BIST Dword Error count register */
100 u32 res[15]; /* Reserved locations */
101 u32 testr; /* Test Register */
102 u32 versionr; /* Version Register */
103 u32 idr; /* ID Register */
104 u32 unimpl[192]; /* Unimplemented */
105 u32 dmadr[256]; /* FIFO Locations in DMA Mode */
106 };
107
108 enum {
109 SCR_SCONTROL_DET_ENABLE = 0x00000001,
110 SCR_SSTATUS_DET_PRESENT = 0x00000001,
111 SCR_SERROR_DIAG_X = 0x04000000,
112 /* DWC SATA Register Operations */
113 SATA_DWC_TXFIFO_DEPTH = 0x01FF,
114 SATA_DWC_RXFIFO_DEPTH = 0x01FF,
115 SATA_DWC_DMACR_TMOD_TXCHEN = 0x00000004,
116 SATA_DWC_DMACR_TXCHEN = (0x00000001 | SATA_DWC_DMACR_TMOD_TXCHEN),
117 SATA_DWC_DMACR_RXCHEN = (0x00000002 | SATA_DWC_DMACR_TMOD_TXCHEN),
118 SATA_DWC_DMACR_TXRXCH_CLEAR = SATA_DWC_DMACR_TMOD_TXCHEN,
119 SATA_DWC_INTPR_DMAT = 0x00000001,
120 SATA_DWC_INTPR_NEWFP = 0x00000002,
121 SATA_DWC_INTPR_PMABRT = 0x00000004,
122 SATA_DWC_INTPR_ERR = 0x00000008,
123 SATA_DWC_INTPR_NEWBIST = 0x00000010,
124 SATA_DWC_INTPR_IPF = 0x10000000,
125 SATA_DWC_INTMR_DMATM = 0x00000001,
126 SATA_DWC_INTMR_NEWFPM = 0x00000002,
127 SATA_DWC_INTMR_PMABRTM = 0x00000004,
128 SATA_DWC_INTMR_ERRM = 0x00000008,
129 SATA_DWC_INTMR_NEWBISTM = 0x00000010,
130 SATA_DWC_LLCR_SCRAMEN = 0x00000001,
131 SATA_DWC_LLCR_DESCRAMEN = 0x00000002,
132 SATA_DWC_LLCR_RPDEN = 0x00000004,
133 /* This is all error bits, zero's are reserved fields. */
134 SATA_DWC_SERROR_ERR_BITS = 0x0FFF0F03
135 };
136
137 #define SATA_DWC_SCR0_SPD_GET(v) (((v) >> 4) & 0x0000000F)
138 #define SATA_DWC_DMACR_TX_CLEAR(v) (((v) & ~SATA_DWC_DMACR_TXCHEN) |\
139 SATA_DWC_DMACR_TMOD_TXCHEN)
140 #define SATA_DWC_DMACR_RX_CLEAR(v) (((v) & ~SATA_DWC_DMACR_RXCHEN) |\
141 SATA_DWC_DMACR_TMOD_TXCHEN)
142 #define SATA_DWC_DBTSR_MWR(size) (((size)/4) & SATA_DWC_TXFIFO_DEPTH)
143 #define SATA_DWC_DBTSR_MRD(size) ((((size)/4) & SATA_DWC_RXFIFO_DEPTH)\
144 << 16)
145 struct sata_dwc_device {
146 struct device *dev; /* generic device struct */
147 struct ata_probe_ent *pe; /* ptr to probe-ent */
148 struct ata_host *host;
149 u8 __iomem *reg_base;
150 struct sata_dwc_regs *sata_dwc_regs; /* DW Synopsys SATA specific */
151 struct dw_dma_chip *dma;
152 };
153
154 #define SATA_DWC_QCMD_MAX 32
155
156 struct sata_dwc_device_port {
157 struct sata_dwc_device *hsdev;
158 int cmd_issued[SATA_DWC_QCMD_MAX];
159 int dma_pending[SATA_DWC_QCMD_MAX];
160
161 /* DMA info */
162 struct dw_dma_slave *dws;
163 struct dma_chan *chan;
164 struct dma_async_tx_descriptor *desc[SATA_DWC_QCMD_MAX];
165 u32 dma_interrupt_count;
166 };
167
168 /*
169 * Commonly used DWC SATA driver Macros
170 */
171 #define HSDEV_FROM_HOST(host) ((struct sata_dwc_device *)\
172 (host)->private_data)
173 #define HSDEV_FROM_AP(ap) ((struct sata_dwc_device *)\
174 (ap)->host->private_data)
175 #define HSDEVP_FROM_AP(ap) ((struct sata_dwc_device_port *)\
176 (ap)->private_data)
177 #define HSDEV_FROM_QC(qc) ((struct sata_dwc_device *)\
178 (qc)->ap->host->private_data)
179 #define HSDEV_FROM_HSDEVP(p) ((struct sata_dwc_device *)\
180 (hsdevp)->hsdev)
181
182 enum {
183 SATA_DWC_CMD_ISSUED_NOT = 0,
184 SATA_DWC_CMD_ISSUED_PEND = 1,
185 SATA_DWC_CMD_ISSUED_EXEC = 2,
186 SATA_DWC_CMD_ISSUED_NODATA = 3,
187
188 SATA_DWC_DMA_PENDING_NONE = 0,
189 SATA_DWC_DMA_PENDING_TX = 1,
190 SATA_DWC_DMA_PENDING_RX = 2,
191 };
192
193 struct sata_dwc_host_priv {
194 void __iomem *scr_addr_sstatus;
195 u32 sata_dwc_sactive_issued ;
196 u32 sata_dwc_sactive_queued ;
197 };
198
199 static struct sata_dwc_host_priv host_pvt;
200
201 static struct dw_dma_slave sata_dwc_dma_dws = {
202 .src_id = 0,
203 .dst_id = 0,
204 .src_master = 0,
205 .dst_master = 1,
206 };
207
208 /*
209 * Prototypes
210 */
211 static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag);
212 static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc,
213 u32 check_status);
214 static void sata_dwc_dma_xfer_complete(struct ata_port *ap, u32 check_status);
215 static void sata_dwc_port_stop(struct ata_port *ap);
216 static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag);
217
218 static const char *get_prot_descript(u8 protocol)
219 {
220 switch ((enum ata_tf_protocols)protocol) {
221 case ATA_PROT_NODATA:
222 return "ATA no data";
223 case ATA_PROT_PIO:
224 return "ATA PIO";
225 case ATA_PROT_DMA:
226 return "ATA DMA";
227 case ATA_PROT_NCQ:
228 return "ATA NCQ";
229 case ATAPI_PROT_NODATA:
230 return "ATAPI no data";
231 case ATAPI_PROT_PIO:
232 return "ATAPI PIO";
233 case ATAPI_PROT_DMA:
234 return "ATAPI DMA";
235 default:
236 return "unknown";
237 }
238 }
239
240 static const char *get_dma_dir_descript(int dma_dir)
241 {
242 switch ((enum dma_data_direction)dma_dir) {
243 case DMA_BIDIRECTIONAL:
244 return "bidirectional";
245 case DMA_TO_DEVICE:
246 return "to device";
247 case DMA_FROM_DEVICE:
248 return "from device";
249 default:
250 return "none";
251 }
252 }
253
254 static void sata_dwc_tf_dump(struct ata_port *ap, struct ata_taskfile *tf)
255 {
256 dev_vdbg(ap->dev,
257 "taskfile cmd: 0x%02x protocol: %s flags: 0x%lx device: %x\n",
258 tf->command, get_prot_descript(tf->protocol), tf->flags,
259 tf->device);
260 dev_vdbg(ap->dev,
261 "feature: 0x%02x nsect: 0x%x lbal: 0x%x lbam: 0x%x lbah: 0x%x\n",
262 tf->feature, tf->nsect, tf->lbal, tf->lbam, tf->lbah);
263 dev_vdbg(ap->dev,
264 "hob_feature: 0x%02x hob_nsect: 0x%x hob_lbal: 0x%x hob_lbam: 0x%x hob_lbah: 0x%x\n",
265 tf->hob_feature, tf->hob_nsect, tf->hob_lbal, tf->hob_lbam,
266 tf->hob_lbah);
267 }
268
269 static void dma_dwc_xfer_done(void *hsdev_instance)
270 {
271 unsigned long flags;
272 struct sata_dwc_device *hsdev = hsdev_instance;
273 struct ata_host *host = (struct ata_host *)hsdev->host;
274 struct ata_port *ap;
275 struct sata_dwc_device_port *hsdevp;
276 u8 tag = 0;
277 unsigned int port = 0;
278
279 spin_lock_irqsave(&host->lock, flags);
280 ap = host->ports[port];
281 hsdevp = HSDEVP_FROM_AP(ap);
282 tag = ap->link.active_tag;
283
284 /*
285 * Each DMA command produces 2 interrupts. Only
286 * complete the command after both interrupts have been
287 * seen. (See sata_dwc_isr())
288 */
289 hsdevp->dma_interrupt_count++;
290 sata_dwc_clear_dmacr(hsdevp, tag);
291
292 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_NONE) {
293 dev_err(ap->dev, "DMA not pending tag=0x%02x pending=%d\n",
294 tag, hsdevp->dma_pending[tag]);
295 }
296
297 if ((hsdevp->dma_interrupt_count % 2) == 0)
298 sata_dwc_dma_xfer_complete(ap, 1);
299
300 spin_unlock_irqrestore(&host->lock, flags);
301 }
302
303 static struct dma_async_tx_descriptor *dma_dwc_xfer_setup(struct ata_queued_cmd *qc)
304 {
305 struct ata_port *ap = qc->ap;
306 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
307 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
308 dma_addr_t addr = (dma_addr_t)&hsdev->sata_dwc_regs->dmadr;
309 struct dma_slave_config sconf;
310 struct dma_async_tx_descriptor *desc;
311
312 if (qc->dma_dir == DMA_DEV_TO_MEM) {
313 sconf.src_addr = addr;
314 sconf.device_fc = true;
315 } else { /* DMA_MEM_TO_DEV */
316 sconf.dst_addr = addr;
317 sconf.device_fc = false;
318 }
319
320 sconf.direction = qc->dma_dir;
321 sconf.src_maxburst = AHB_DMA_BRST_DFLT;
322 sconf.dst_maxburst = AHB_DMA_BRST_DFLT;
323 sconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
324 sconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
325
326 dmaengine_slave_config(hsdevp->chan, &sconf);
327
328 /* Convert SG list to linked list of items (LLIs) for AHB DMA */
329 desc = dmaengine_prep_slave_sg(hsdevp->chan, qc->sg, qc->n_elem,
330 qc->dma_dir,
331 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
332
333 if (!desc)
334 return NULL;
335
336 desc->callback = dma_dwc_xfer_done;
337 desc->callback_param = hsdev;
338
339 dev_dbg(hsdev->dev, "%s sg: 0x%p, count: %d addr: %pad\n",
340 __func__, qc->sg, qc->n_elem, &addr);
341
342 return desc;
343 }
344
345 static int sata_dwc_scr_read(struct ata_link *link, unsigned int scr, u32 *val)
346 {
347 if (scr > SCR_NOTIFICATION) {
348 dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
349 __func__, scr);
350 return -EINVAL;
351 }
352
353 *val = in_le32(link->ap->ioaddr.scr_addr + (scr * 4));
354 dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=val=0x%08x\n",
355 __func__, link->ap->print_id, scr, *val);
356
357 return 0;
358 }
359
360 static int sata_dwc_scr_write(struct ata_link *link, unsigned int scr, u32 val)
361 {
362 dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=val=0x%08x\n",
363 __func__, link->ap->print_id, scr, val);
364 if (scr > SCR_NOTIFICATION) {
365 dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
366 __func__, scr);
367 return -EINVAL;
368 }
369 out_le32(link->ap->ioaddr.scr_addr + (scr * 4), val);
370
371 return 0;
372 }
373
374 static u32 core_scr_read(unsigned int scr)
375 {
376 return in_le32(host_pvt.scr_addr_sstatus + (scr * 4));
377 }
378
379 static void core_scr_write(unsigned int scr, u32 val)
380 {
381 out_le32(host_pvt.scr_addr_sstatus + (scr * 4), val);
382 }
383
384 static void clear_serror(void)
385 {
386 u32 val;
387 val = core_scr_read(SCR_ERROR);
388 core_scr_write(SCR_ERROR, val);
389 }
390
391 static void clear_interrupt_bit(struct sata_dwc_device *hsdev, u32 bit)
392 {
393 out_le32(&hsdev->sata_dwc_regs->intpr,
394 in_le32(&hsdev->sata_dwc_regs->intpr));
395 }
396
397 static u32 qcmd_tag_to_mask(u8 tag)
398 {
399 return 0x00000001 << (tag & 0x1f);
400 }
401
402 /* See ahci.c */
403 static void sata_dwc_error_intr(struct ata_port *ap,
404 struct sata_dwc_device *hsdev, uint intpr)
405 {
406 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
407 struct ata_eh_info *ehi = &ap->link.eh_info;
408 unsigned int err_mask = 0, action = 0;
409 struct ata_queued_cmd *qc;
410 u32 serror;
411 u8 status, tag;
412
413 ata_ehi_clear_desc(ehi);
414
415 serror = core_scr_read(SCR_ERROR);
416 status = ap->ops->sff_check_status(ap);
417
418 tag = ap->link.active_tag;
419
420 dev_err(ap->dev,
421 "%s SCR_ERROR=0x%08x intpr=0x%08x status=0x%08x dma_intp=%d pending=%d issued=%d",
422 __func__, serror, intpr, status, hsdevp->dma_interrupt_count,
423 hsdevp->dma_pending[tag], hsdevp->cmd_issued[tag]);
424
425 /* Clear error register and interrupt bit */
426 clear_serror();
427 clear_interrupt_bit(hsdev, SATA_DWC_INTPR_ERR);
428
429 /* This is the only error happening now. TODO check for exact error */
430
431 err_mask |= AC_ERR_HOST_BUS;
432 action |= ATA_EH_RESET;
433
434 /* Pass this on to EH */
435 ehi->serror |= serror;
436 ehi->action |= action;
437
438 qc = ata_qc_from_tag(ap, tag);
439 if (qc)
440 qc->err_mask |= err_mask;
441 else
442 ehi->err_mask |= err_mask;
443
444 ata_port_abort(ap);
445 }
446
447 /*
448 * Function : sata_dwc_isr
449 * arguments : irq, void *dev_instance, struct pt_regs *regs
450 * Return value : irqreturn_t - status of IRQ
451 * This Interrupt handler called via port ops registered function.
452 * .irq_handler = sata_dwc_isr
453 */
454 static irqreturn_t sata_dwc_isr(int irq, void *dev_instance)
455 {
456 struct ata_host *host = (struct ata_host *)dev_instance;
457 struct sata_dwc_device *hsdev = HSDEV_FROM_HOST(host);
458 struct ata_port *ap;
459 struct ata_queued_cmd *qc;
460 unsigned long flags;
461 u8 status, tag;
462 int handled, num_processed, port = 0;
463 uint intpr, sactive, sactive2, tag_mask;
464 struct sata_dwc_device_port *hsdevp;
465 host_pvt.sata_dwc_sactive_issued = 0;
466
467 spin_lock_irqsave(&host->lock, flags);
468
469 /* Read the interrupt register */
470 intpr = in_le32(&hsdev->sata_dwc_regs->intpr);
471
472 ap = host->ports[port];
473 hsdevp = HSDEVP_FROM_AP(ap);
474
475 dev_dbg(ap->dev, "%s intpr=0x%08x active_tag=%d\n", __func__, intpr,
476 ap->link.active_tag);
477
478 /* Check for error interrupt */
479 if (intpr & SATA_DWC_INTPR_ERR) {
480 sata_dwc_error_intr(ap, hsdev, intpr);
481 handled = 1;
482 goto DONE;
483 }
484
485 /* Check for DMA SETUP FIS (FP DMA) interrupt */
486 if (intpr & SATA_DWC_INTPR_NEWFP) {
487 clear_interrupt_bit(hsdev, SATA_DWC_INTPR_NEWFP);
488
489 tag = (u8)(in_le32(&hsdev->sata_dwc_regs->fptagr));
490 dev_dbg(ap->dev, "%s: NEWFP tag=%d\n", __func__, tag);
491 if (hsdevp->cmd_issued[tag] != SATA_DWC_CMD_ISSUED_PEND)
492 dev_warn(ap->dev, "CMD tag=%d not pending?\n", tag);
493
494 host_pvt.sata_dwc_sactive_issued |= qcmd_tag_to_mask(tag);
495
496 qc = ata_qc_from_tag(ap, tag);
497 /*
498 * Start FP DMA for NCQ command. At this point the tag is the
499 * active tag. It is the tag that matches the command about to
500 * be completed.
501 */
502 qc->ap->link.active_tag = tag;
503 sata_dwc_bmdma_start_by_tag(qc, tag);
504
505 handled = 1;
506 goto DONE;
507 }
508 sactive = core_scr_read(SCR_ACTIVE);
509 tag_mask = (host_pvt.sata_dwc_sactive_issued | sactive) ^ sactive;
510
511 /* If no sactive issued and tag_mask is zero then this is not NCQ */
512 if (host_pvt.sata_dwc_sactive_issued == 0 && tag_mask == 0) {
513 if (ap->link.active_tag == ATA_TAG_POISON)
514 tag = 0;
515 else
516 tag = ap->link.active_tag;
517 qc = ata_qc_from_tag(ap, tag);
518
519 /* DEV interrupt w/ no active qc? */
520 if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) {
521 dev_err(ap->dev,
522 "%s interrupt with no active qc qc=%p\n",
523 __func__, qc);
524 ap->ops->sff_check_status(ap);
525 handled = 1;
526 goto DONE;
527 }
528 status = ap->ops->sff_check_status(ap);
529
530 qc->ap->link.active_tag = tag;
531 hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
532
533 if (status & ATA_ERR) {
534 dev_dbg(ap->dev, "interrupt ATA_ERR (0x%x)\n", status);
535 sata_dwc_qc_complete(ap, qc, 1);
536 handled = 1;
537 goto DONE;
538 }
539
540 dev_dbg(ap->dev, "%s non-NCQ cmd interrupt, protocol: %s\n",
541 __func__, get_prot_descript(qc->tf.protocol));
542 DRVSTILLBUSY:
543 if (ata_is_dma(qc->tf.protocol)) {
544 /*
545 * Each DMA transaction produces 2 interrupts. The DMAC
546 * transfer complete interrupt and the SATA controller
547 * operation done interrupt. The command should be
548 * completed only after both interrupts are seen.
549 */
550 hsdevp->dma_interrupt_count++;
551 if (hsdevp->dma_pending[tag] == \
552 SATA_DWC_DMA_PENDING_NONE) {
553 dev_err(ap->dev,
554 "%s: DMA not pending intpr=0x%08x status=0x%08x pending=%d\n",
555 __func__, intpr, status,
556 hsdevp->dma_pending[tag]);
557 }
558
559 if ((hsdevp->dma_interrupt_count % 2) == 0)
560 sata_dwc_dma_xfer_complete(ap, 1);
561 } else if (ata_is_pio(qc->tf.protocol)) {
562 ata_sff_hsm_move(ap, qc, status, 0);
563 handled = 1;
564 goto DONE;
565 } else {
566 if (unlikely(sata_dwc_qc_complete(ap, qc, 1)))
567 goto DRVSTILLBUSY;
568 }
569
570 handled = 1;
571 goto DONE;
572 }
573
574 /*
575 * This is a NCQ command. At this point we need to figure out for which
576 * tags we have gotten a completion interrupt. One interrupt may serve
577 * as completion for more than one operation when commands are queued
578 * (NCQ). We need to process each completed command.
579 */
580
581 /* process completed commands */
582 sactive = core_scr_read(SCR_ACTIVE);
583 tag_mask = (host_pvt.sata_dwc_sactive_issued | sactive) ^ sactive;
584
585 if (sactive != 0 || (host_pvt.sata_dwc_sactive_issued) > 1 || \
586 tag_mask > 1) {
587 dev_dbg(ap->dev,
588 "%s NCQ:sactive=0x%08x sactive_issued=0x%08x tag_mask=0x%08x\n",
589 __func__, sactive, host_pvt.sata_dwc_sactive_issued,
590 tag_mask);
591 }
592
593 if ((tag_mask | (host_pvt.sata_dwc_sactive_issued)) != \
594 (host_pvt.sata_dwc_sactive_issued)) {
595 dev_warn(ap->dev,
596 "Bad tag mask? sactive=0x%08x (host_pvt.sata_dwc_sactive_issued)=0x%08x tag_mask=0x%08x\n",
597 sactive, host_pvt.sata_dwc_sactive_issued, tag_mask);
598 }
599
600 /* read just to clear ... not bad if currently still busy */
601 status = ap->ops->sff_check_status(ap);
602 dev_dbg(ap->dev, "%s ATA status register=0x%x\n", __func__, status);
603
604 tag = 0;
605 num_processed = 0;
606 while (tag_mask) {
607 num_processed++;
608 while (!(tag_mask & 0x00000001)) {
609 tag++;
610 tag_mask <<= 1;
611 }
612
613 tag_mask &= (~0x00000001);
614 qc = ata_qc_from_tag(ap, tag);
615
616 /* To be picked up by completion functions */
617 qc->ap->link.active_tag = tag;
618 hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
619
620 /* Let libata/scsi layers handle error */
621 if (status & ATA_ERR) {
622 dev_dbg(ap->dev, "%s ATA_ERR (0x%x)\n", __func__,
623 status);
624 sata_dwc_qc_complete(ap, qc, 1);
625 handled = 1;
626 goto DONE;
627 }
628
629 /* Process completed command */
630 dev_dbg(ap->dev, "%s NCQ command, protocol: %s\n", __func__,
631 get_prot_descript(qc->tf.protocol));
632 if (ata_is_dma(qc->tf.protocol)) {
633 hsdevp->dma_interrupt_count++;
634 if (hsdevp->dma_pending[tag] == \
635 SATA_DWC_DMA_PENDING_NONE)
636 dev_warn(ap->dev, "%s: DMA not pending?\n",
637 __func__);
638 if ((hsdevp->dma_interrupt_count % 2) == 0)
639 sata_dwc_dma_xfer_complete(ap, 1);
640 } else {
641 if (unlikely(sata_dwc_qc_complete(ap, qc, 1)))
642 goto STILLBUSY;
643 }
644 continue;
645
646 STILLBUSY:
647 ap->stats.idle_irq++;
648 dev_warn(ap->dev, "STILL BUSY IRQ ata%d: irq trap\n",
649 ap->print_id);
650 } /* while tag_mask */
651
652 /*
653 * Check to see if any commands completed while we were processing our
654 * initial set of completed commands (read status clears interrupts,
655 * so we might miss a completed command interrupt if one came in while
656 * we were processing --we read status as part of processing a completed
657 * command).
658 */
659 sactive2 = core_scr_read(SCR_ACTIVE);
660 if (sactive2 != sactive) {
661 dev_dbg(ap->dev,
662 "More completed - sactive=0x%x sactive2=0x%x\n",
663 sactive, sactive2);
664 }
665 handled = 1;
666
667 DONE:
668 spin_unlock_irqrestore(&host->lock, flags);
669 return IRQ_RETVAL(handled);
670 }
671
672 static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag)
673 {
674 struct sata_dwc_device *hsdev = HSDEV_FROM_HSDEVP(hsdevp);
675
676 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_RX) {
677 out_le32(&(hsdev->sata_dwc_regs->dmacr),
678 SATA_DWC_DMACR_RX_CLEAR(
679 in_le32(&(hsdev->sata_dwc_regs->dmacr))));
680 } else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_TX) {
681 out_le32(&(hsdev->sata_dwc_regs->dmacr),
682 SATA_DWC_DMACR_TX_CLEAR(
683 in_le32(&(hsdev->sata_dwc_regs->dmacr))));
684 } else {
685 /*
686 * This should not happen, it indicates the driver is out of
687 * sync. If it does happen, clear dmacr anyway.
688 */
689 dev_err(hsdev->dev,
690 "%s DMA protocol RX and TX DMA not pending tag=0x%02x pending=%d dmacr: 0x%08x\n",
691 __func__, tag, hsdevp->dma_pending[tag],
692 in_le32(&hsdev->sata_dwc_regs->dmacr));
693 out_le32(&(hsdev->sata_dwc_regs->dmacr),
694 SATA_DWC_DMACR_TXRXCH_CLEAR);
695 }
696 }
697
698 static void sata_dwc_dma_xfer_complete(struct ata_port *ap, u32 check_status)
699 {
700 struct ata_queued_cmd *qc;
701 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
702 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
703 u8 tag = 0;
704
705 tag = ap->link.active_tag;
706 qc = ata_qc_from_tag(ap, tag);
707 if (!qc) {
708 dev_err(ap->dev, "failed to get qc");
709 return;
710 }
711
712 #ifdef DEBUG_NCQ
713 if (tag > 0) {
714 dev_info(ap->dev,
715 "%s tag=%u cmd=0x%02x dma dir=%s proto=%s dmacr=0x%08x\n",
716 __func__, qc->tag, qc->tf.command,
717 get_dma_dir_descript(qc->dma_dir),
718 get_prot_descript(qc->tf.protocol),
719 in_le32(&(hsdev->sata_dwc_regs->dmacr)));
720 }
721 #endif
722
723 if (ata_is_dma(qc->tf.protocol)) {
724 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_NONE) {
725 dev_err(ap->dev,
726 "%s DMA protocol RX and TX DMA not pending dmacr: 0x%08x\n",
727 __func__,
728 in_le32(&(hsdev->sata_dwc_regs->dmacr)));
729 }
730
731 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_NONE;
732 sata_dwc_qc_complete(ap, qc, check_status);
733 ap->link.active_tag = ATA_TAG_POISON;
734 } else {
735 sata_dwc_qc_complete(ap, qc, check_status);
736 }
737 }
738
739 static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc,
740 u32 check_status)
741 {
742 u8 status = 0;
743 u32 mask = 0x0;
744 u8 tag = qc->tag;
745 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
746 host_pvt.sata_dwc_sactive_queued = 0;
747 dev_dbg(ap->dev, "%s checkstatus? %x\n", __func__, check_status);
748
749 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_TX)
750 dev_err(ap->dev, "TX DMA PENDING\n");
751 else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_RX)
752 dev_err(ap->dev, "RX DMA PENDING\n");
753 dev_dbg(ap->dev,
754 "QC complete cmd=0x%02x status=0x%02x ata%u: protocol=%d\n",
755 qc->tf.command, status, ap->print_id, qc->tf.protocol);
756
757 /* clear active bit */
758 mask = (~(qcmd_tag_to_mask(tag)));
759 host_pvt.sata_dwc_sactive_queued = (host_pvt.sata_dwc_sactive_queued) \
760 & mask;
761 host_pvt.sata_dwc_sactive_issued = (host_pvt.sata_dwc_sactive_issued) \
762 & mask;
763 ata_qc_complete(qc);
764 return 0;
765 }
766
767 static void sata_dwc_enable_interrupts(struct sata_dwc_device *hsdev)
768 {
769 /* Enable selective interrupts by setting the interrupt maskregister*/
770 out_le32(&hsdev->sata_dwc_regs->intmr,
771 SATA_DWC_INTMR_ERRM |
772 SATA_DWC_INTMR_NEWFPM |
773 SATA_DWC_INTMR_PMABRTM |
774 SATA_DWC_INTMR_DMATM);
775 /*
776 * Unmask the error bits that should trigger an error interrupt by
777 * setting the error mask register.
778 */
779 out_le32(&hsdev->sata_dwc_regs->errmr, SATA_DWC_SERROR_ERR_BITS);
780
781 dev_dbg(hsdev->dev, "%s: INTMR = 0x%08x, ERRMR = 0x%08x\n",
782 __func__, in_le32(&hsdev->sata_dwc_regs->intmr),
783 in_le32(&hsdev->sata_dwc_regs->errmr));
784 }
785
786 static bool sata_dwc_dma_filter(struct dma_chan *chan, void *param)
787 {
788 struct sata_dwc_device_port *hsdevp = param;
789 struct dw_dma_slave *dws = hsdevp->dws;
790
791 if (dws->dma_dev != chan->device->dev)
792 return false;
793
794 chan->private = dws;
795 return true;
796 }
797
798 static void sata_dwc_setup_port(struct ata_ioports *port, unsigned long base)
799 {
800 port->cmd_addr = (void __iomem *)base + 0x00;
801 port->data_addr = (void __iomem *)base + 0x00;
802
803 port->error_addr = (void __iomem *)base + 0x04;
804 port->feature_addr = (void __iomem *)base + 0x04;
805
806 port->nsect_addr = (void __iomem *)base + 0x08;
807
808 port->lbal_addr = (void __iomem *)base + 0x0c;
809 port->lbam_addr = (void __iomem *)base + 0x10;
810 port->lbah_addr = (void __iomem *)base + 0x14;
811
812 port->device_addr = (void __iomem *)base + 0x18;
813 port->command_addr = (void __iomem *)base + 0x1c;
814 port->status_addr = (void __iomem *)base + 0x1c;
815
816 port->altstatus_addr = (void __iomem *)base + 0x20;
817 port->ctl_addr = (void __iomem *)base + 0x20;
818 }
819
820 /*
821 * Function : sata_dwc_port_start
822 * arguments : struct ata_ioports *port
823 * Return value : returns 0 if success, error code otherwise
824 * This function allocates the scatter gather LLI table for AHB DMA
825 */
826 static int sata_dwc_port_start(struct ata_port *ap)
827 {
828 int err = 0;
829 struct sata_dwc_device *hsdev;
830 struct sata_dwc_device_port *hsdevp = NULL;
831 struct device *pdev;
832 dma_cap_mask_t mask;
833 int i;
834
835 hsdev = HSDEV_FROM_AP(ap);
836
837 dev_dbg(ap->dev, "%s: port_no=%d\n", __func__, ap->port_no);
838
839 hsdev->host = ap->host;
840 pdev = ap->host->dev;
841 if (!pdev) {
842 dev_err(ap->dev, "%s: no ap->host->dev\n", __func__);
843 err = -ENODEV;
844 goto CLEANUP;
845 }
846
847 /* Allocate Port Struct */
848 hsdevp = kzalloc(sizeof(*hsdevp), GFP_KERNEL);
849 if (!hsdevp) {
850 dev_err(ap->dev, "%s: kmalloc failed for hsdevp\n", __func__);
851 err = -ENOMEM;
852 goto CLEANUP;
853 }
854 hsdevp->hsdev = hsdev;
855
856 hsdevp->dws = &sata_dwc_dma_dws;
857 hsdevp->dws->dma_dev = hsdev->dev;
858
859 dma_cap_zero(mask);
860 dma_cap_set(DMA_SLAVE, mask);
861
862 /* Acquire DMA channel */
863 hsdevp->chan = dma_request_channel(mask, sata_dwc_dma_filter, hsdevp);
864 if (!hsdevp->chan) {
865 dev_err(hsdev->dev, "%s: dma channel unavailable\n",
866 __func__);
867 err = -EAGAIN;
868 goto CLEANUP_ALLOC;
869 }
870
871 for (i = 0; i < SATA_DWC_QCMD_MAX; i++)
872 hsdevp->cmd_issued[i] = SATA_DWC_CMD_ISSUED_NOT;
873
874 ap->bmdma_prd = NULL; /* set these so libata doesn't use them */
875 ap->bmdma_prd_dma = 0;
876
877 if (ap->port_no == 0) {
878 dev_dbg(ap->dev, "%s: clearing TXCHEN, RXCHEN in DMAC\n",
879 __func__);
880 out_le32(&hsdev->sata_dwc_regs->dmacr,
881 SATA_DWC_DMACR_TXRXCH_CLEAR);
882
883 dev_dbg(ap->dev, "%s: setting burst size in DBTSR\n",
884 __func__);
885 out_le32(&hsdev->sata_dwc_regs->dbtsr,
886 (SATA_DWC_DBTSR_MWR(AHB_DMA_BRST_DFLT) |
887 SATA_DWC_DBTSR_MRD(AHB_DMA_BRST_DFLT)));
888 }
889
890 /* Clear any error bits before libata starts issuing commands */
891 clear_serror();
892 ap->private_data = hsdevp;
893 dev_dbg(ap->dev, "%s: done\n", __func__);
894 return 0;
895
896 CLEANUP_ALLOC:
897 kfree(hsdevp);
898 CLEANUP:
899 dev_dbg(ap->dev, "%s: fail. ap->id = %d\n", __func__, ap->print_id);
900 return err;
901 }
902
903 static void sata_dwc_port_stop(struct ata_port *ap)
904 {
905 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
906
907 dev_dbg(ap->dev, "%s: ap->id = %d\n", __func__, ap->print_id);
908
909 dmaengine_terminate_all(hsdevp->chan);
910 dma_release_channel(hsdevp->chan);
911
912 kfree(hsdevp);
913 ap->private_data = NULL;
914 }
915
916 /*
917 * Function : sata_dwc_exec_command_by_tag
918 * arguments : ata_port *ap, ata_taskfile *tf, u8 tag, u32 cmd_issued
919 * Return value : None
920 * This function keeps track of individual command tag ids and calls
921 * ata_exec_command in libata
922 */
923 static void sata_dwc_exec_command_by_tag(struct ata_port *ap,
924 struct ata_taskfile *tf,
925 u8 tag, u32 cmd_issued)
926 {
927 unsigned long flags;
928 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
929
930 dev_dbg(ap->dev, "%s cmd(0x%02x): %s tag=%d\n", __func__, tf->command,
931 ata_get_cmd_descript(tf->command), tag);
932
933 spin_lock_irqsave(&ap->host->lock, flags);
934 hsdevp->cmd_issued[tag] = cmd_issued;
935 spin_unlock_irqrestore(&ap->host->lock, flags);
936 /*
937 * Clear SError before executing a new command.
938 * sata_dwc_scr_write and read can not be used here. Clearing the PM
939 * managed SError register for the disk needs to be done before the
940 * task file is loaded.
941 */
942 clear_serror();
943 ata_sff_exec_command(ap, tf);
944 }
945
946 static void sata_dwc_bmdma_setup_by_tag(struct ata_queued_cmd *qc, u8 tag)
947 {
948 sata_dwc_exec_command_by_tag(qc->ap, &qc->tf, tag,
949 SATA_DWC_CMD_ISSUED_PEND);
950 }
951
952 static void sata_dwc_bmdma_setup(struct ata_queued_cmd *qc)
953 {
954 u8 tag = qc->tag;
955
956 if (ata_is_ncq(qc->tf.protocol)) {
957 dev_dbg(qc->ap->dev, "%s: ap->link.sactive=0x%08x tag=%d\n",
958 __func__, qc->ap->link.sactive, tag);
959 } else {
960 tag = 0;
961 }
962 sata_dwc_bmdma_setup_by_tag(qc, tag);
963 }
964
965 static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag)
966 {
967 int start_dma;
968 u32 reg;
969 struct sata_dwc_device *hsdev = HSDEV_FROM_QC(qc);
970 struct ata_port *ap = qc->ap;
971 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
972 struct dma_async_tx_descriptor *desc = hsdevp->desc[tag];
973 int dir = qc->dma_dir;
974
975 if (hsdevp->cmd_issued[tag] != SATA_DWC_CMD_ISSUED_NOT) {
976 start_dma = 1;
977 if (dir == DMA_TO_DEVICE)
978 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_TX;
979 else
980 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_RX;
981 } else {
982 dev_err(ap->dev,
983 "%s: Command not pending cmd_issued=%d (tag=%d) DMA NOT started\n",
984 __func__, hsdevp->cmd_issued[tag], tag);
985 start_dma = 0;
986 }
987
988 dev_dbg(ap->dev,
989 "%s qc=%p tag: %x cmd: 0x%02x dma_dir: %s start_dma? %x\n",
990 __func__, qc, tag, qc->tf.command,
991 get_dma_dir_descript(qc->dma_dir), start_dma);
992 sata_dwc_tf_dump(ap, &qc->tf);
993
994 if (start_dma) {
995 reg = core_scr_read(SCR_ERROR);
996 if (reg & SATA_DWC_SERROR_ERR_BITS) {
997 dev_err(ap->dev, "%s: ****** SError=0x%08x ******\n",
998 __func__, reg);
999 }
1000
1001 if (dir == DMA_TO_DEVICE)
1002 out_le32(&hsdev->sata_dwc_regs->dmacr,
1003 SATA_DWC_DMACR_TXCHEN);
1004 else
1005 out_le32(&hsdev->sata_dwc_regs->dmacr,
1006 SATA_DWC_DMACR_RXCHEN);
1007
1008 /* Enable AHB DMA transfer on the specified channel */
1009 dmaengine_submit(desc);
1010 dma_async_issue_pending(hsdevp->chan);
1011 }
1012 }
1013
1014 static void sata_dwc_bmdma_start(struct ata_queued_cmd *qc)
1015 {
1016 u8 tag = qc->tag;
1017
1018 if (ata_is_ncq(qc->tf.protocol)) {
1019 dev_dbg(qc->ap->dev, "%s: ap->link.sactive=0x%08x tag=%d\n",
1020 __func__, qc->ap->link.sactive, tag);
1021 } else {
1022 tag = 0;
1023 }
1024 dev_dbg(qc->ap->dev, "%s\n", __func__);
1025 sata_dwc_bmdma_start_by_tag(qc, tag);
1026 }
1027
1028 /*
1029 * Function : sata_dwc_qc_prep_by_tag
1030 * arguments : ata_queued_cmd *qc, u8 tag
1031 * Return value : None
1032 * qc_prep for a particular queued command based on tag
1033 */
1034 static void sata_dwc_qc_prep_by_tag(struct ata_queued_cmd *qc, u8 tag)
1035 {
1036 struct dma_async_tx_descriptor *desc;
1037 struct ata_port *ap = qc->ap;
1038 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
1039
1040 dev_dbg(ap->dev, "%s: port=%d dma dir=%s n_elem=%d\n",
1041 __func__, ap->port_no, get_dma_dir_descript(qc->dma_dir),
1042 qc->n_elem);
1043
1044 desc = dma_dwc_xfer_setup(qc);
1045 if (!desc) {
1046 dev_err(ap->dev, "%s: dma_dwc_xfer_setup returns NULL\n",
1047 __func__);
1048 return;
1049 }
1050 hsdevp->desc[tag] = desc;
1051 }
1052
1053 static unsigned int sata_dwc_qc_issue(struct ata_queued_cmd *qc)
1054 {
1055 u32 sactive;
1056 u8 tag = qc->tag;
1057 struct ata_port *ap = qc->ap;
1058
1059 #ifdef DEBUG_NCQ
1060 if (qc->tag > 0 || ap->link.sactive > 1)
1061 dev_info(ap->dev,
1062 "%s ap id=%d cmd(0x%02x)=%s qc tag=%d prot=%s ap active_tag=0x%08x ap sactive=0x%08x\n",
1063 __func__, ap->print_id, qc->tf.command,
1064 ata_get_cmd_descript(qc->tf.command),
1065 qc->tag, get_prot_descript(qc->tf.protocol),
1066 ap->link.active_tag, ap->link.sactive);
1067 #endif
1068
1069 if (!ata_is_ncq(qc->tf.protocol))
1070 tag = 0;
1071 sata_dwc_qc_prep_by_tag(qc, tag);
1072
1073 if (ata_is_ncq(qc->tf.protocol)) {
1074 sactive = core_scr_read(SCR_ACTIVE);
1075 sactive |= (0x00000001 << tag);
1076 core_scr_write(SCR_ACTIVE, sactive);
1077
1078 dev_dbg(qc->ap->dev,
1079 "%s: tag=%d ap->link.sactive = 0x%08x sactive=0x%08x\n",
1080 __func__, tag, qc->ap->link.sactive, sactive);
1081
1082 ap->ops->sff_tf_load(ap, &qc->tf);
1083 sata_dwc_exec_command_by_tag(ap, &qc->tf, qc->tag,
1084 SATA_DWC_CMD_ISSUED_PEND);
1085 } else {
1086 ata_sff_qc_issue(qc);
1087 }
1088 return 0;
1089 }
1090
1091 /*
1092 * Function : sata_dwc_qc_prep
1093 * arguments : ata_queued_cmd *qc
1094 * Return value : None
1095 * qc_prep for a particular queued command
1096 */
1097
1098 static void sata_dwc_qc_prep(struct ata_queued_cmd *qc)
1099 {
1100 if ((qc->dma_dir == DMA_NONE) || (qc->tf.protocol == ATA_PROT_PIO))
1101 return;
1102
1103 #ifdef DEBUG_NCQ
1104 if (qc->tag > 0)
1105 dev_info(qc->ap->dev, "%s: qc->tag=%d ap->active_tag=0x%08x\n",
1106 __func__, qc->tag, qc->ap->link.active_tag);
1107
1108 return ;
1109 #endif
1110 }
1111
1112 static void sata_dwc_error_handler(struct ata_port *ap)
1113 {
1114 ata_sff_error_handler(ap);
1115 }
1116
1117 static int sata_dwc_hardreset(struct ata_link *link, unsigned int *class,
1118 unsigned long deadline)
1119 {
1120 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(link->ap);
1121 int ret;
1122
1123 ret = sata_sff_hardreset(link, class, deadline);
1124
1125 sata_dwc_enable_interrupts(hsdev);
1126
1127 /* Reconfigure the DMA control register */
1128 out_le32(&hsdev->sata_dwc_regs->dmacr,
1129 SATA_DWC_DMACR_TXRXCH_CLEAR);
1130
1131 /* Reconfigure the DMA Burst Transaction Size register */
1132 out_le32(&hsdev->sata_dwc_regs->dbtsr,
1133 SATA_DWC_DBTSR_MWR(AHB_DMA_BRST_DFLT) |
1134 SATA_DWC_DBTSR_MRD(AHB_DMA_BRST_DFLT));
1135
1136 return ret;
1137 }
1138
1139 /*
1140 * scsi mid-layer and libata interface structures
1141 */
1142 static struct scsi_host_template sata_dwc_sht = {
1143 ATA_NCQ_SHT(DRV_NAME),
1144 /*
1145 * test-only: Currently this driver doesn't handle NCQ
1146 * correctly. We enable NCQ but set the queue depth to a
1147 * max of 1. This will get fixed in in a future release.
1148 */
1149 .sg_tablesize = LIBATA_MAX_PRD,
1150 /* .can_queue = ATA_MAX_QUEUE, */
1151 .dma_boundary = ATA_DMA_BOUNDARY,
1152 };
1153
1154 static struct ata_port_operations sata_dwc_ops = {
1155 .inherits = &ata_sff_port_ops,
1156
1157 .error_handler = sata_dwc_error_handler,
1158 .hardreset = sata_dwc_hardreset,
1159
1160 .qc_prep = sata_dwc_qc_prep,
1161 .qc_issue = sata_dwc_qc_issue,
1162
1163 .scr_read = sata_dwc_scr_read,
1164 .scr_write = sata_dwc_scr_write,
1165
1166 .port_start = sata_dwc_port_start,
1167 .port_stop = sata_dwc_port_stop,
1168
1169 .bmdma_setup = sata_dwc_bmdma_setup,
1170 .bmdma_start = sata_dwc_bmdma_start,
1171 };
1172
1173 static const struct ata_port_info sata_dwc_port_info[] = {
1174 {
1175 .flags = ATA_FLAG_SATA | ATA_FLAG_NCQ,
1176 .pio_mask = ATA_PIO4,
1177 .udma_mask = ATA_UDMA6,
1178 .port_ops = &sata_dwc_ops,
1179 },
1180 };
1181
1182 static int sata_dwc_probe(struct platform_device *ofdev)
1183 {
1184 struct sata_dwc_device *hsdev;
1185 u32 idr, versionr;
1186 char *ver = (char *)&versionr;
1187 u8 __iomem *base;
1188 int err = 0;
1189 int irq;
1190 struct ata_host *host;
1191 struct ata_port_info pi = sata_dwc_port_info[0];
1192 const struct ata_port_info *ppi[] = { &pi, NULL };
1193 struct device_node *np = ofdev->dev.of_node;
1194
1195 /* Allocate DWC SATA device */
1196 host = ata_host_alloc_pinfo(&ofdev->dev, ppi, SATA_DWC_MAX_PORTS);
1197 hsdev = devm_kzalloc(&ofdev->dev, sizeof(*hsdev), GFP_KERNEL);
1198 if (!host || !hsdev)
1199 return -ENOMEM;
1200
1201 host->private_data = hsdev;
1202
1203 /* Ioremap SATA registers */
1204 base = of_iomap(np, 0);
1205 if (!base) {
1206 dev_err(&ofdev->dev,
1207 "ioremap failed for SATA register address\n");
1208 return -ENODEV;
1209 }
1210 hsdev->reg_base = base;
1211 dev_dbg(&ofdev->dev, "ioremap done for SATA register address\n");
1212
1213 /* Synopsys DWC SATA specific Registers */
1214 hsdev->sata_dwc_regs = (void *__iomem)(base + SATA_DWC_REG_OFFSET);
1215
1216 /* Setup port */
1217 host->ports[0]->ioaddr.cmd_addr = base;
1218 host->ports[0]->ioaddr.scr_addr = base + SATA_DWC_SCR_OFFSET;
1219 host_pvt.scr_addr_sstatus = base + SATA_DWC_SCR_OFFSET;
1220 sata_dwc_setup_port(&host->ports[0]->ioaddr, (unsigned long)base);
1221
1222 /* Read the ID and Version Registers */
1223 idr = in_le32(&hsdev->sata_dwc_regs->idr);
1224 versionr = in_le32(&hsdev->sata_dwc_regs->versionr);
1225 dev_notice(&ofdev->dev, "id %d, controller version %c.%c%c\n",
1226 idr, ver[0], ver[1], ver[2]);
1227
1228 /* Get SATA DMA interrupt number */
1229 hsdev->dma->irq = irq_of_parse_and_map(np, 1);
1230 if (hsdev->dma->irq == NO_IRQ) {
1231 dev_err(&ofdev->dev, "no SATA DMA irq\n");
1232 err = -ENODEV;
1233 goto error_iomap;
1234 }
1235
1236 /* Get physical SATA DMA register base address */
1237 hsdev->dma->regs = of_iomap(np, 1);
1238 if (!hsdev->dma->regs) {
1239 dev_err(&ofdev->dev,
1240 "ioremap failed for AHBDMA register address\n");
1241 err = -ENODEV;
1242 goto error_iomap;
1243 }
1244
1245 /* Save dev for later use in dev_xxx() routines */
1246 hsdev->dev = &ofdev->dev;
1247
1248 hsdev->dma->dev = &ofdev->dev;
1249
1250 /* Initialize AHB DMAC */
1251 err = dw_dma_probe(hsdev->dma, NULL);
1252 if (err)
1253 goto error_dma_iomap;
1254
1255 /* Enable SATA Interrupts */
1256 sata_dwc_enable_interrupts(hsdev);
1257
1258 /* Get SATA interrupt number */
1259 irq = irq_of_parse_and_map(np, 0);
1260 if (irq == NO_IRQ) {
1261 dev_err(&ofdev->dev, "no SATA DMA irq\n");
1262 err = -ENODEV;
1263 goto error_out;
1264 }
1265
1266 /*
1267 * Now, register with libATA core, this will also initiate the
1268 * device discovery process, invoking our port_start() handler &
1269 * error_handler() to execute a dummy Softreset EH session
1270 */
1271 err = ata_host_activate(host, irq, sata_dwc_isr, 0, &sata_dwc_sht);
1272 if (err)
1273 dev_err(&ofdev->dev, "failed to activate host");
1274
1275 dev_set_drvdata(&ofdev->dev, host);
1276 return 0;
1277
1278 error_out:
1279 /* Free SATA DMA resources */
1280 dw_dma_remove(hsdev->dma);
1281 error_dma_iomap:
1282 iounmap(hsdev->dma->regs);
1283 error_iomap:
1284 iounmap(base);
1285 return err;
1286 }
1287
1288 static int sata_dwc_remove(struct platform_device *ofdev)
1289 {
1290 struct device *dev = &ofdev->dev;
1291 struct ata_host *host = dev_get_drvdata(dev);
1292 struct sata_dwc_device *hsdev = host->private_data;
1293
1294 ata_host_detach(host);
1295
1296 /* Free SATA DMA resources */
1297 dw_dma_remove(hsdev->dma);
1298
1299 iounmap(hsdev->dma->regs);
1300 iounmap(hsdev->reg_base);
1301 dev_dbg(&ofdev->dev, "done\n");
1302 return 0;
1303 }
1304
1305 static const struct of_device_id sata_dwc_match[] = {
1306 { .compatible = "amcc,sata-460ex", },
1307 {}
1308 };
1309 MODULE_DEVICE_TABLE(of, sata_dwc_match);
1310
1311 static struct platform_driver sata_dwc_driver = {
1312 .driver = {
1313 .name = DRV_NAME,
1314 .of_match_table = sata_dwc_match,
1315 },
1316 .probe = sata_dwc_probe,
1317 .remove = sata_dwc_remove,
1318 };
1319
1320 module_platform_driver(sata_dwc_driver);
1321
1322 MODULE_LICENSE("GPL");
1323 MODULE_AUTHOR("Mark Miesfeld <mmiesfeld@amcc.com>");
1324 MODULE_DESCRIPTION("DesignWare Cores SATA controller low level driver");
1325 MODULE_VERSION(DRV_VERSION);
Linux with added FPC-III support