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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * drivers/ata/sata_dwc_460ex.c
4 *
5 * Synopsys DesignWare Cores (DWC) SATA host driver
6 *
7 * Author: Mark Miesfeld <mmiesfeld@amcc.com>
8 *
9 * Ported from 2.6.19.2 to 2.6.25/26 by Stefan Roese <sr@denx.de>
10 * Copyright 2008 DENX Software Engineering
11 *
12 * Based on versions provided by AMCC and Synopsys which are:
13 * Copyright 2006 Applied Micro Circuits Corporation
14 * COPYRIGHT (C) 2005 SYNOPSYS, INC. ALL RIGHTS RESERVED
15 */
16
17#ifdef CONFIG_SATA_DWC_DEBUG
18#define DEBUG
19#endif
20
21#ifdef CONFIG_SATA_DWC_VDEBUG
22#define VERBOSE_DEBUG
23#define DEBUG_NCQ
24#endif
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/device.h>
29#include <linux/dmaengine.h>
30#include <linux/of_address.h>
31#include <linux/of_irq.h>
32#include <linux/of_platform.h>
33#include <linux/platform_device.h>
34#include <linux/phy/phy.h>
35#include <linux/libata.h>
36#include <linux/slab.h>
37
38#include "libata.h"
39
40#include <scsi/scsi_host.h>
41#include <scsi/scsi_cmnd.h>
42
43/* These two are defined in "libata.h" */
44#undef DRV_NAME
45#undef DRV_VERSION
46
47#define DRV_NAME "sata-dwc"
48#define DRV_VERSION "1.3"
49
50#define sata_dwc_writel(a, v) writel_relaxed(v, a)
51#define sata_dwc_readl(a) readl_relaxed(a)
52
53#ifndef NO_IRQ
54#define NO_IRQ 0
55#endif
56
57#define AHB_DMA_BRST_DFLT 64 /* 16 data items burst length */
58
59enum {
60 SATA_DWC_MAX_PORTS = 1,
61
62 SATA_DWC_SCR_OFFSET = 0x24,
63 SATA_DWC_REG_OFFSET = 0x64,
64};
65
66/* DWC SATA Registers */
67struct sata_dwc_regs {
68 u32 fptagr; /* 1st party DMA tag */
69 u32 fpbor; /* 1st party DMA buffer offset */
70 u32 fptcr; /* 1st party DMA Xfr count */
71 u32 dmacr; /* DMA Control */
72 u32 dbtsr; /* DMA Burst Transac size */
73 u32 intpr; /* Interrupt Pending */
74 u32 intmr; /* Interrupt Mask */
75 u32 errmr; /* Error Mask */
76 u32 llcr; /* Link Layer Control */
77 u32 phycr; /* PHY Control */
78 u32 physr; /* PHY Status */
79 u32 rxbistpd; /* Recvd BIST pattern def register */
80 u32 rxbistpd1; /* Recvd BIST data dword1 */
81 u32 rxbistpd2; /* Recvd BIST pattern data dword2 */
82 u32 txbistpd; /* Trans BIST pattern def register */
83 u32 txbistpd1; /* Trans BIST data dword1 */
84 u32 txbistpd2; /* Trans BIST data dword2 */
85 u32 bistcr; /* BIST Control Register */
86 u32 bistfctr; /* BIST FIS Count Register */
87 u32 bistsr; /* BIST Status Register */
88 u32 bistdecr; /* BIST Dword Error count register */
89 u32 res[15]; /* Reserved locations */
90 u32 testr; /* Test Register */
91 u32 versionr; /* Version Register */
92 u32 idr; /* ID Register */
93 u32 unimpl[192]; /* Unimplemented */
94 u32 dmadr[256]; /* FIFO Locations in DMA Mode */
95};
96
97enum {
98 SCR_SCONTROL_DET_ENABLE = 0x00000001,
99 SCR_SSTATUS_DET_PRESENT = 0x00000001,
100 SCR_SERROR_DIAG_X = 0x04000000,
101/* DWC SATA Register Operations */
102 SATA_DWC_TXFIFO_DEPTH = 0x01FF,
103 SATA_DWC_RXFIFO_DEPTH = 0x01FF,
104 SATA_DWC_DMACR_TMOD_TXCHEN = 0x00000004,
105 SATA_DWC_DMACR_TXCHEN = (0x00000001 | SATA_DWC_DMACR_TMOD_TXCHEN),
106 SATA_DWC_DMACR_RXCHEN = (0x00000002 | SATA_DWC_DMACR_TMOD_TXCHEN),
107 SATA_DWC_DMACR_TXRXCH_CLEAR = SATA_DWC_DMACR_TMOD_TXCHEN,
108 SATA_DWC_INTPR_DMAT = 0x00000001,
109 SATA_DWC_INTPR_NEWFP = 0x00000002,
110 SATA_DWC_INTPR_PMABRT = 0x00000004,
111 SATA_DWC_INTPR_ERR = 0x00000008,
112 SATA_DWC_INTPR_NEWBIST = 0x00000010,
113 SATA_DWC_INTPR_IPF = 0x10000000,
114 SATA_DWC_INTMR_DMATM = 0x00000001,
115 SATA_DWC_INTMR_NEWFPM = 0x00000002,
116 SATA_DWC_INTMR_PMABRTM = 0x00000004,
117 SATA_DWC_INTMR_ERRM = 0x00000008,
118 SATA_DWC_INTMR_NEWBISTM = 0x00000010,
119 SATA_DWC_LLCR_SCRAMEN = 0x00000001,
120 SATA_DWC_LLCR_DESCRAMEN = 0x00000002,
121 SATA_DWC_LLCR_RPDEN = 0x00000004,
122/* This is all error bits, zero's are reserved fields. */
123 SATA_DWC_SERROR_ERR_BITS = 0x0FFF0F03
124};
125
126#define SATA_DWC_SCR0_SPD_GET(v) (((v) >> 4) & 0x0000000F)
127#define SATA_DWC_DMACR_TX_CLEAR(v) (((v) & ~SATA_DWC_DMACR_TXCHEN) |\
128 SATA_DWC_DMACR_TMOD_TXCHEN)
129#define SATA_DWC_DMACR_RX_CLEAR(v) (((v) & ~SATA_DWC_DMACR_RXCHEN) |\
130 SATA_DWC_DMACR_TMOD_TXCHEN)
131#define SATA_DWC_DBTSR_MWR(size) (((size)/4) & SATA_DWC_TXFIFO_DEPTH)
132#define SATA_DWC_DBTSR_MRD(size) ((((size)/4) & SATA_DWC_RXFIFO_DEPTH)\
133 << 16)
134struct sata_dwc_device {
135 struct device *dev; /* generic device struct */
136 struct ata_probe_ent *pe; /* ptr to probe-ent */
137 struct ata_host *host;
138 struct sata_dwc_regs __iomem *sata_dwc_regs; /* DW SATA specific */
139 u32 sactive_issued;
140 u32 sactive_queued;
141 struct phy *phy;
142 phys_addr_t dmadr;
143#ifdef CONFIG_SATA_DWC_OLD_DMA
144 struct dw_dma_chip *dma;
145#endif
146};
147
148#define SATA_DWC_QCMD_MAX 32
149
150struct sata_dwc_device_port {
151 struct sata_dwc_device *hsdev;
152 int cmd_issued[SATA_DWC_QCMD_MAX];
153 int dma_pending[SATA_DWC_QCMD_MAX];
154
155 /* DMA info */
156 struct dma_chan *chan;
157 struct dma_async_tx_descriptor *desc[SATA_DWC_QCMD_MAX];
158 u32 dma_interrupt_count;
159};
160
161/*
162 * Commonly used DWC SATA driver macros
163 */
164#define HSDEV_FROM_HOST(host) ((struct sata_dwc_device *)(host)->private_data)
165#define HSDEV_FROM_AP(ap) ((struct sata_dwc_device *)(ap)->host->private_data)
166#define HSDEVP_FROM_AP(ap) ((struct sata_dwc_device_port *)(ap)->private_data)
167#define HSDEV_FROM_QC(qc) ((struct sata_dwc_device *)(qc)->ap->host->private_data)
168#define HSDEV_FROM_HSDEVP(p) ((struct sata_dwc_device *)(p)->hsdev)
169
170enum {
171 SATA_DWC_CMD_ISSUED_NOT = 0,
172 SATA_DWC_CMD_ISSUED_PEND = 1,
173 SATA_DWC_CMD_ISSUED_EXEC = 2,
174 SATA_DWC_CMD_ISSUED_NODATA = 3,
175
176 SATA_DWC_DMA_PENDING_NONE = 0,
177 SATA_DWC_DMA_PENDING_TX = 1,
178 SATA_DWC_DMA_PENDING_RX = 2,
179};
180
181/*
182 * Prototypes
183 */
184static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag);
185static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc,
186 u32 check_status);
187static void sata_dwc_dma_xfer_complete(struct ata_port *ap, u32 check_status);
188static void sata_dwc_port_stop(struct ata_port *ap);
189static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag);
190
191#ifdef CONFIG_SATA_DWC_OLD_DMA
192
193#include <linux/platform_data/dma-dw.h>
194#include <linux/dma/dw.h>
195
196static struct dw_dma_slave sata_dwc_dma_dws = {
197 .src_id = 0,
198 .dst_id = 0,
199 .m_master = 1,
200 .p_master = 0,
201};
202
203static bool sata_dwc_dma_filter(struct dma_chan *chan, void *param)
204{
205 struct dw_dma_slave *dws = &sata_dwc_dma_dws;
206
207 if (dws->dma_dev != chan->device->dev)
208 return false;
209
210 chan->private = dws;
211 return true;
212}
213
214static int sata_dwc_dma_get_channel_old(struct sata_dwc_device_port *hsdevp)
215{
216 struct sata_dwc_device *hsdev = hsdevp->hsdev;
217 struct dw_dma_slave *dws = &sata_dwc_dma_dws;
218 dma_cap_mask_t mask;
219
220 dws->dma_dev = hsdev->dev;
221
222 dma_cap_zero(mask);
223 dma_cap_set(DMA_SLAVE, mask);
224
225 /* Acquire DMA channel */
226 hsdevp->chan = dma_request_channel(mask, sata_dwc_dma_filter, hsdevp);
227 if (!hsdevp->chan) {
228 dev_err(hsdev->dev, "%s: dma channel unavailable\n",
229 __func__);
230 return -EAGAIN;
231 }
232
233 return 0;
234}
235
236static int sata_dwc_dma_init_old(struct platform_device *pdev,
237 struct sata_dwc_device *hsdev)
238{
239 struct device_node *np = pdev->dev.of_node;
240 struct resource *res;
241
242 hsdev->dma = devm_kzalloc(&pdev->dev, sizeof(*hsdev->dma), GFP_KERNEL);
243 if (!hsdev->dma)
244 return -ENOMEM;
245
246 hsdev->dma->dev = &pdev->dev;
247 hsdev->dma->id = pdev->id;
248
249 /* Get SATA DMA interrupt number */
250 hsdev->dma->irq = irq_of_parse_and_map(np, 1);
251 if (hsdev->dma->irq == NO_IRQ) {
252 dev_err(&pdev->dev, "no SATA DMA irq\n");
253 return -ENODEV;
254 }
255
256 /* Get physical SATA DMA register base address */
257 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
258 hsdev->dma->regs = devm_ioremap_resource(&pdev->dev, res);
259 if (IS_ERR(hsdev->dma->regs))
260 return PTR_ERR(hsdev->dma->regs);
261
262 /* Initialize AHB DMAC */
263 return dw_dma_probe(hsdev->dma);
264}
265
266static void sata_dwc_dma_exit_old(struct sata_dwc_device *hsdev)
267{
268 if (!hsdev->dma)
269 return;
270
271 dw_dma_remove(hsdev->dma);
272}
273
274#endif
275
276static const char *get_prot_descript(u8 protocol)
277{
278 switch (protocol) {
279 case ATA_PROT_NODATA:
280 return "ATA no data";
281 case ATA_PROT_PIO:
282 return "ATA PIO";
283 case ATA_PROT_DMA:
284 return "ATA DMA";
285 case ATA_PROT_NCQ:
286 return "ATA NCQ";
287 case ATA_PROT_NCQ_NODATA:
288 return "ATA NCQ no data";
289 case ATAPI_PROT_NODATA:
290 return "ATAPI no data";
291 case ATAPI_PROT_PIO:
292 return "ATAPI PIO";
293 case ATAPI_PROT_DMA:
294 return "ATAPI DMA";
295 default:
296 return "unknown";
297 }
298}
299
300static const char *get_dma_dir_descript(int dma_dir)
301{
302 switch ((enum dma_data_direction)dma_dir) {
303 case DMA_BIDIRECTIONAL:
304 return "bidirectional";
305 case DMA_TO_DEVICE:
306 return "to device";
307 case DMA_FROM_DEVICE:
308 return "from device";
309 default:
310 return "none";
311 }
312}
313
314static void sata_dwc_tf_dump(struct ata_port *ap, struct ata_taskfile *tf)
315{
316 dev_vdbg(ap->dev,
317 "taskfile cmd: 0x%02x protocol: %s flags: 0x%lx device: %x\n",
318 tf->command, get_prot_descript(tf->protocol), tf->flags,
319 tf->device);
320 dev_vdbg(ap->dev,
321 "feature: 0x%02x nsect: 0x%x lbal: 0x%x lbam: 0x%x lbah: 0x%x\n",
322 tf->feature, tf->nsect, tf->lbal, tf->lbam, tf->lbah);
323 dev_vdbg(ap->dev,
324 "hob_feature: 0x%02x hob_nsect: 0x%x hob_lbal: 0x%x hob_lbam: 0x%x hob_lbah: 0x%x\n",
325 tf->hob_feature, tf->hob_nsect, tf->hob_lbal, tf->hob_lbam,
326 tf->hob_lbah);
327}
328
329static void dma_dwc_xfer_done(void *hsdev_instance)
330{
331 unsigned long flags;
332 struct sata_dwc_device *hsdev = hsdev_instance;
333 struct ata_host *host = (struct ata_host *)hsdev->host;
334 struct ata_port *ap;
335 struct sata_dwc_device_port *hsdevp;
336 u8 tag = 0;
337 unsigned int port = 0;
338
339 spin_lock_irqsave(&host->lock, flags);
340 ap = host->ports[port];
341 hsdevp = HSDEVP_FROM_AP(ap);
342 tag = ap->link.active_tag;
343
344 /*
345 * Each DMA command produces 2 interrupts. Only
346 * complete the command after both interrupts have been
347 * seen. (See sata_dwc_isr())
348 */
349 hsdevp->dma_interrupt_count++;
350 sata_dwc_clear_dmacr(hsdevp, tag);
351
352 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_NONE) {
353 dev_err(ap->dev, "DMA not pending tag=0x%02x pending=%d\n",
354 tag, hsdevp->dma_pending[tag]);
355 }
356
357 if ((hsdevp->dma_interrupt_count % 2) == 0)
358 sata_dwc_dma_xfer_complete(ap, 1);
359
360 spin_unlock_irqrestore(&host->lock, flags);
361}
362
363static struct dma_async_tx_descriptor *dma_dwc_xfer_setup(struct ata_queued_cmd *qc)
364{
365 struct ata_port *ap = qc->ap;
366 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
367 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
368 struct dma_slave_config sconf;
369 struct dma_async_tx_descriptor *desc;
370
371 if (qc->dma_dir == DMA_DEV_TO_MEM) {
372 sconf.src_addr = hsdev->dmadr;
373 sconf.device_fc = false;
374 } else { /* DMA_MEM_TO_DEV */
375 sconf.dst_addr = hsdev->dmadr;
376 sconf.device_fc = false;
377 }
378
379 sconf.direction = qc->dma_dir;
380 sconf.src_maxburst = AHB_DMA_BRST_DFLT / 4; /* in items */
381 sconf.dst_maxburst = AHB_DMA_BRST_DFLT / 4; /* in items */
382 sconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
383 sconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
384
385 dmaengine_slave_config(hsdevp->chan, &sconf);
386
387 /* Convert SG list to linked list of items (LLIs) for AHB DMA */
388 desc = dmaengine_prep_slave_sg(hsdevp->chan, qc->sg, qc->n_elem,
389 qc->dma_dir,
390 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
391
392 if (!desc)
393 return NULL;
394
395 desc->callback = dma_dwc_xfer_done;
396 desc->callback_param = hsdev;
397
398 dev_dbg(hsdev->dev, "%s sg: 0x%p, count: %d addr: %pa\n", __func__,
399 qc->sg, qc->n_elem, &hsdev->dmadr);
400
401 return desc;
402}
403
404static int sata_dwc_scr_read(struct ata_link *link, unsigned int scr, u32 *val)
405{
406 if (scr > SCR_NOTIFICATION) {
407 dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
408 __func__, scr);
409 return -EINVAL;
410 }
411
412 *val = sata_dwc_readl(link->ap->ioaddr.scr_addr + (scr * 4));
413 dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=0x%08x\n", __func__,
414 link->ap->print_id, scr, *val);
415
416 return 0;
417}
418
419static int sata_dwc_scr_write(struct ata_link *link, unsigned int scr, u32 val)
420{
421 dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=0x%08x\n", __func__,
422 link->ap->print_id, scr, val);
423 if (scr > SCR_NOTIFICATION) {
424 dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
425 __func__, scr);
426 return -EINVAL;
427 }
428 sata_dwc_writel(link->ap->ioaddr.scr_addr + (scr * 4), val);
429
430 return 0;
431}
432
433static void clear_serror(struct ata_port *ap)
434{
435 u32 val;
436 sata_dwc_scr_read(&ap->link, SCR_ERROR, &val);
437 sata_dwc_scr_write(&ap->link, SCR_ERROR, val);
438}
439
440static void clear_interrupt_bit(struct sata_dwc_device *hsdev, u32 bit)
441{
442 sata_dwc_writel(&hsdev->sata_dwc_regs->intpr,
443 sata_dwc_readl(&hsdev->sata_dwc_regs->intpr));
444}
445
446static u32 qcmd_tag_to_mask(u8 tag)
447{
448 return 0x00000001 << (tag & 0x1f);
449}
450
451/* See ahci.c */
452static void sata_dwc_error_intr(struct ata_port *ap,
453 struct sata_dwc_device *hsdev, uint intpr)
454{
455 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
456 struct ata_eh_info *ehi = &ap->link.eh_info;
457 unsigned int err_mask = 0, action = 0;
458 struct ata_queued_cmd *qc;
459 u32 serror;
460 u8 status, tag;
461
462 ata_ehi_clear_desc(ehi);
463
464 sata_dwc_scr_read(&ap->link, SCR_ERROR, &serror);
465 status = ap->ops->sff_check_status(ap);
466
467 tag = ap->link.active_tag;
468
469 dev_err(ap->dev,
470 "%s SCR_ERROR=0x%08x intpr=0x%08x status=0x%08x dma_intp=%d pending=%d issued=%d",
471 __func__, serror, intpr, status, hsdevp->dma_interrupt_count,
472 hsdevp->dma_pending[tag], hsdevp->cmd_issued[tag]);
473
474 /* Clear error register and interrupt bit */
475 clear_serror(ap);
476 clear_interrupt_bit(hsdev, SATA_DWC_INTPR_ERR);
477
478 /* This is the only error happening now. TODO check for exact error */
479
480 err_mask |= AC_ERR_HOST_BUS;
481 action |= ATA_EH_RESET;
482
483 /* Pass this on to EH */
484 ehi->serror |= serror;
485 ehi->action |= action;
486
487 qc = ata_qc_from_tag(ap, tag);
488 if (qc)
489 qc->err_mask |= err_mask;
490 else
491 ehi->err_mask |= err_mask;
492
493 ata_port_abort(ap);
494}
495
496/*
497 * Function : sata_dwc_isr
498 * arguments : irq, void *dev_instance, struct pt_regs *regs
499 * Return value : irqreturn_t - status of IRQ
500 * This Interrupt handler called via port ops registered function.
501 * .irq_handler = sata_dwc_isr
502 */
503static irqreturn_t sata_dwc_isr(int irq, void *dev_instance)
504{
505 struct ata_host *host = (struct ata_host *)dev_instance;
506 struct sata_dwc_device *hsdev = HSDEV_FROM_HOST(host);
507 struct ata_port *ap;
508 struct ata_queued_cmd *qc;
509 unsigned long flags;
510 u8 status, tag;
511 int handled, num_processed, port = 0;
512 uint intpr, sactive, sactive2, tag_mask;
513 struct sata_dwc_device_port *hsdevp;
514 hsdev->sactive_issued = 0;
515
516 spin_lock_irqsave(&host->lock, flags);
517
518 /* Read the interrupt register */
519 intpr = sata_dwc_readl(&hsdev->sata_dwc_regs->intpr);
520
521 ap = host->ports[port];
522 hsdevp = HSDEVP_FROM_AP(ap);
523
524 dev_dbg(ap->dev, "%s intpr=0x%08x active_tag=%d\n", __func__, intpr,
525 ap->link.active_tag);
526
527 /* Check for error interrupt */
528 if (intpr & SATA_DWC_INTPR_ERR) {
529 sata_dwc_error_intr(ap, hsdev, intpr);
530 handled = 1;
531 goto DONE;
532 }
533
534 /* Check for DMA SETUP FIS (FP DMA) interrupt */
535 if (intpr & SATA_DWC_INTPR_NEWFP) {
536 clear_interrupt_bit(hsdev, SATA_DWC_INTPR_NEWFP);
537
538 tag = (u8)(sata_dwc_readl(&hsdev->sata_dwc_regs->fptagr));
539 dev_dbg(ap->dev, "%s: NEWFP tag=%d\n", __func__, tag);
540 if (hsdevp->cmd_issued[tag] != SATA_DWC_CMD_ISSUED_PEND)
541 dev_warn(ap->dev, "CMD tag=%d not pending?\n", tag);
542
543 hsdev->sactive_issued |= qcmd_tag_to_mask(tag);
544
545 qc = ata_qc_from_tag(ap, tag);
546 /*
547 * Start FP DMA for NCQ command. At this point the tag is the
548 * active tag. It is the tag that matches the command about to
549 * be completed.
550 */
551 qc->ap->link.active_tag = tag;
552 sata_dwc_bmdma_start_by_tag(qc, tag);
553
554 handled = 1;
555 goto DONE;
556 }
557 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
558 tag_mask = (hsdev->sactive_issued | sactive) ^ sactive;
559
560 /* If no sactive issued and tag_mask is zero then this is not NCQ */
561 if (hsdev->sactive_issued == 0 && tag_mask == 0) {
562 if (ap->link.active_tag == ATA_TAG_POISON)
563 tag = 0;
564 else
565 tag = ap->link.active_tag;
566 qc = ata_qc_from_tag(ap, tag);
567
568 /* DEV interrupt w/ no active qc? */
569 if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) {
570 dev_err(ap->dev,
571 "%s interrupt with no active qc qc=%p\n",
572 __func__, qc);
573 ap->ops->sff_check_status(ap);
574 handled = 1;
575 goto DONE;
576 }
577 status = ap->ops->sff_check_status(ap);
578
579 qc->ap->link.active_tag = tag;
580 hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
581
582 if (status & ATA_ERR) {
583 dev_dbg(ap->dev, "interrupt ATA_ERR (0x%x)\n", status);
584 sata_dwc_qc_complete(ap, qc, 1);
585 handled = 1;
586 goto DONE;
587 }
588
589 dev_dbg(ap->dev, "%s non-NCQ cmd interrupt, protocol: %s\n",
590 __func__, get_prot_descript(qc->tf.protocol));
591DRVSTILLBUSY:
592 if (ata_is_dma(qc->tf.protocol)) {
593 /*
594 * Each DMA transaction produces 2 interrupts. The DMAC
595 * transfer complete interrupt and the SATA controller
596 * operation done interrupt. The command should be
597 * completed only after both interrupts are seen.
598 */
599 hsdevp->dma_interrupt_count++;
600 if (hsdevp->dma_pending[tag] == \
601 SATA_DWC_DMA_PENDING_NONE) {
602 dev_err(ap->dev,
603 "%s: DMA not pending intpr=0x%08x status=0x%08x pending=%d\n",
604 __func__, intpr, status,
605 hsdevp->dma_pending[tag]);
606 }
607
608 if ((hsdevp->dma_interrupt_count % 2) == 0)
609 sata_dwc_dma_xfer_complete(ap, 1);
610 } else if (ata_is_pio(qc->tf.protocol)) {
611 ata_sff_hsm_move(ap, qc, status, 0);
612 handled = 1;
613 goto DONE;
614 } else {
615 if (unlikely(sata_dwc_qc_complete(ap, qc, 1)))
616 goto DRVSTILLBUSY;
617 }
618
619 handled = 1;
620 goto DONE;
621 }
622
623 /*
624 * This is a NCQ command. At this point we need to figure out for which
625 * tags we have gotten a completion interrupt. One interrupt may serve
626 * as completion for more than one operation when commands are queued
627 * (NCQ). We need to process each completed command.
628 */
629
630 /* process completed commands */
631 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
632 tag_mask = (hsdev->sactive_issued | sactive) ^ sactive;
633
634 if (sactive != 0 || hsdev->sactive_issued > 1 || tag_mask > 1) {
635 dev_dbg(ap->dev,
636 "%s NCQ:sactive=0x%08x sactive_issued=0x%08x tag_mask=0x%08x\n",
637 __func__, sactive, hsdev->sactive_issued, tag_mask);
638 }
639
640 if ((tag_mask | hsdev->sactive_issued) != hsdev->sactive_issued) {
641 dev_warn(ap->dev,
642 "Bad tag mask? sactive=0x%08x sactive_issued=0x%08x tag_mask=0x%08x\n",
643 sactive, hsdev->sactive_issued, tag_mask);
644 }
645
646 /* read just to clear ... not bad if currently still busy */
647 status = ap->ops->sff_check_status(ap);
648 dev_dbg(ap->dev, "%s ATA status register=0x%x\n", __func__, status);
649
650 tag = 0;
651 num_processed = 0;
652 while (tag_mask) {
653 num_processed++;
654 while (!(tag_mask & 0x00000001)) {
655 tag++;
656 tag_mask <<= 1;
657 }
658
659 tag_mask &= (~0x00000001);
660 qc = ata_qc_from_tag(ap, tag);
661
662 /* To be picked up by completion functions */
663 qc->ap->link.active_tag = tag;
664 hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
665
666 /* Let libata/scsi layers handle error */
667 if (status & ATA_ERR) {
668 dev_dbg(ap->dev, "%s ATA_ERR (0x%x)\n", __func__,
669 status);
670 sata_dwc_qc_complete(ap, qc, 1);
671 handled = 1;
672 goto DONE;
673 }
674
675 /* Process completed command */
676 dev_dbg(ap->dev, "%s NCQ command, protocol: %s\n", __func__,
677 get_prot_descript(qc->tf.protocol));
678 if (ata_is_dma(qc->tf.protocol)) {
679 hsdevp->dma_interrupt_count++;
680 if (hsdevp->dma_pending[tag] == \
681 SATA_DWC_DMA_PENDING_NONE)
682 dev_warn(ap->dev, "%s: DMA not pending?\n",
683 __func__);
684 if ((hsdevp->dma_interrupt_count % 2) == 0)
685 sata_dwc_dma_xfer_complete(ap, 1);
686 } else {
687 if (unlikely(sata_dwc_qc_complete(ap, qc, 1)))
688 goto STILLBUSY;
689 }
690 continue;
691
692STILLBUSY:
693 ap->stats.idle_irq++;
694 dev_warn(ap->dev, "STILL BUSY IRQ ata%d: irq trap\n",
695 ap->print_id);
696 } /* while tag_mask */
697
698 /*
699 * Check to see if any commands completed while we were processing our
700 * initial set of completed commands (read status clears interrupts,
701 * so we might miss a completed command interrupt if one came in while
702 * we were processing --we read status as part of processing a completed
703 * command).
704 */
705 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive2);
706 if (sactive2 != sactive) {
707 dev_dbg(ap->dev,
708 "More completed - sactive=0x%x sactive2=0x%x\n",
709 sactive, sactive2);
710 }
711 handled = 1;
712
713DONE:
714 spin_unlock_irqrestore(&host->lock, flags);
715 return IRQ_RETVAL(handled);
716}
717
718static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag)
719{
720 struct sata_dwc_device *hsdev = HSDEV_FROM_HSDEVP(hsdevp);
721 u32 dmacr = sata_dwc_readl(&hsdev->sata_dwc_regs->dmacr);
722
723 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_RX) {
724 dmacr = SATA_DWC_DMACR_RX_CLEAR(dmacr);
725 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr, dmacr);
726 } else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_TX) {
727 dmacr = SATA_DWC_DMACR_TX_CLEAR(dmacr);
728 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr, dmacr);
729 } else {
730 /*
731 * This should not happen, it indicates the driver is out of
732 * sync. If it does happen, clear dmacr anyway.
733 */
734 dev_err(hsdev->dev,
735 "%s DMA protocol RX and TX DMA not pending tag=0x%02x pending=%d dmacr: 0x%08x\n",
736 __func__, tag, hsdevp->dma_pending[tag], dmacr);
737 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
738 SATA_DWC_DMACR_TXRXCH_CLEAR);
739 }
740}
741
742static void sata_dwc_dma_xfer_complete(struct ata_port *ap, u32 check_status)
743{
744 struct ata_queued_cmd *qc;
745 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
746 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
747 u8 tag = 0;
748
749 tag = ap->link.active_tag;
750 qc = ata_qc_from_tag(ap, tag);
751 if (!qc) {
752 dev_err(ap->dev, "failed to get qc");
753 return;
754 }
755
756#ifdef DEBUG_NCQ
757 if (tag > 0) {
758 dev_info(ap->dev,
759 "%s tag=%u cmd=0x%02x dma dir=%s proto=%s dmacr=0x%08x\n",
760 __func__, qc->hw_tag, qc->tf.command,
761 get_dma_dir_descript(qc->dma_dir),
762 get_prot_descript(qc->tf.protocol),
763 sata_dwc_readl(&hsdev->sata_dwc_regs->dmacr));
764 }
765#endif
766
767 if (ata_is_dma(qc->tf.protocol)) {
768 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_NONE) {
769 dev_err(ap->dev,
770 "%s DMA protocol RX and TX DMA not pending dmacr: 0x%08x\n",
771 __func__,
772 sata_dwc_readl(&hsdev->sata_dwc_regs->dmacr));
773 }
774
775 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_NONE;
776 sata_dwc_qc_complete(ap, qc, check_status);
777 ap->link.active_tag = ATA_TAG_POISON;
778 } else {
779 sata_dwc_qc_complete(ap, qc, check_status);
780 }
781}
782
783static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc,
784 u32 check_status)
785{
786 u8 status = 0;
787 u32 mask = 0x0;
788 u8 tag = qc->hw_tag;
789 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
790 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
791 hsdev->sactive_queued = 0;
792 dev_dbg(ap->dev, "%s checkstatus? %x\n", __func__, check_status);
793
794 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_TX)
795 dev_err(ap->dev, "TX DMA PENDING\n");
796 else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_RX)
797 dev_err(ap->dev, "RX DMA PENDING\n");
798 dev_dbg(ap->dev,
799 "QC complete cmd=0x%02x status=0x%02x ata%u: protocol=%d\n",
800 qc->tf.command, status, ap->print_id, qc->tf.protocol);
801
802 /* clear active bit */
803 mask = (~(qcmd_tag_to_mask(tag)));
804 hsdev->sactive_queued = hsdev->sactive_queued & mask;
805 hsdev->sactive_issued = hsdev->sactive_issued & mask;
806 ata_qc_complete(qc);
807 return 0;
808}
809
810static void sata_dwc_enable_interrupts(struct sata_dwc_device *hsdev)
811{
812 /* Enable selective interrupts by setting the interrupt maskregister*/
813 sata_dwc_writel(&hsdev->sata_dwc_regs->intmr,
814 SATA_DWC_INTMR_ERRM |
815 SATA_DWC_INTMR_NEWFPM |
816 SATA_DWC_INTMR_PMABRTM |
817 SATA_DWC_INTMR_DMATM);
818 /*
819 * Unmask the error bits that should trigger an error interrupt by
820 * setting the error mask register.
821 */
822 sata_dwc_writel(&hsdev->sata_dwc_regs->errmr, SATA_DWC_SERROR_ERR_BITS);
823
824 dev_dbg(hsdev->dev, "%s: INTMR = 0x%08x, ERRMR = 0x%08x\n",
825 __func__, sata_dwc_readl(&hsdev->sata_dwc_regs->intmr),
826 sata_dwc_readl(&hsdev->sata_dwc_regs->errmr));
827}
828
829static void sata_dwc_setup_port(struct ata_ioports *port, void __iomem *base)
830{
831 port->cmd_addr = base + 0x00;
832 port->data_addr = base + 0x00;
833
834 port->error_addr = base + 0x04;
835 port->feature_addr = base + 0x04;
836
837 port->nsect_addr = base + 0x08;
838
839 port->lbal_addr = base + 0x0c;
840 port->lbam_addr = base + 0x10;
841 port->lbah_addr = base + 0x14;
842
843 port->device_addr = base + 0x18;
844 port->command_addr = base + 0x1c;
845 port->status_addr = base + 0x1c;
846
847 port->altstatus_addr = base + 0x20;
848 port->ctl_addr = base + 0x20;
849}
850
851static int sata_dwc_dma_get_channel(struct sata_dwc_device_port *hsdevp)
852{
853 struct sata_dwc_device *hsdev = hsdevp->hsdev;
854 struct device *dev = hsdev->dev;
855
856#ifdef CONFIG_SATA_DWC_OLD_DMA
857 if (!of_find_property(dev->of_node, "dmas", NULL))
858 return sata_dwc_dma_get_channel_old(hsdevp);
859#endif
860
861 hsdevp->chan = dma_request_chan(dev, "sata-dma");
862 if (IS_ERR(hsdevp->chan)) {
863 dev_err(dev, "failed to allocate dma channel: %ld\n",
864 PTR_ERR(hsdevp->chan));
865 return PTR_ERR(hsdevp->chan);
866 }
867
868 return 0;
869}
870
871/*
872 * Function : sata_dwc_port_start
873 * arguments : struct ata_ioports *port
874 * Return value : returns 0 if success, error code otherwise
875 * This function allocates the scatter gather LLI table for AHB DMA
876 */
877static int sata_dwc_port_start(struct ata_port *ap)
878{
879 int err = 0;
880 struct sata_dwc_device *hsdev;
881 struct sata_dwc_device_port *hsdevp = NULL;
882 struct device *pdev;
883 int i;
884
885 hsdev = HSDEV_FROM_AP(ap);
886
887 dev_dbg(ap->dev, "%s: port_no=%d\n", __func__, ap->port_no);
888
889 hsdev->host = ap->host;
890 pdev = ap->host->dev;
891 if (!pdev) {
892 dev_err(ap->dev, "%s: no ap->host->dev\n", __func__);
893 err = -ENODEV;
894 goto CLEANUP;
895 }
896
897 /* Allocate Port Struct */
898 hsdevp = kzalloc(sizeof(*hsdevp), GFP_KERNEL);
899 if (!hsdevp) {
900 err = -ENOMEM;
901 goto CLEANUP;
902 }
903 hsdevp->hsdev = hsdev;
904
905 err = sata_dwc_dma_get_channel(hsdevp);
906 if (err)
907 goto CLEANUP_ALLOC;
908
909 err = phy_power_on(hsdev->phy);
910 if (err)
911 goto CLEANUP_ALLOC;
912
913 for (i = 0; i < SATA_DWC_QCMD_MAX; i++)
914 hsdevp->cmd_issued[i] = SATA_DWC_CMD_ISSUED_NOT;
915
916 ap->bmdma_prd = NULL; /* set these so libata doesn't use them */
917 ap->bmdma_prd_dma = 0;
918
919 if (ap->port_no == 0) {
920 dev_dbg(ap->dev, "%s: clearing TXCHEN, RXCHEN in DMAC\n",
921 __func__);
922 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
923 SATA_DWC_DMACR_TXRXCH_CLEAR);
924
925 dev_dbg(ap->dev, "%s: setting burst size in DBTSR\n",
926 __func__);
927 sata_dwc_writel(&hsdev->sata_dwc_regs->dbtsr,
928 (SATA_DWC_DBTSR_MWR(AHB_DMA_BRST_DFLT) |
929 SATA_DWC_DBTSR_MRD(AHB_DMA_BRST_DFLT)));
930 }
931
932 /* Clear any error bits before libata starts issuing commands */
933 clear_serror(ap);
934 ap->private_data = hsdevp;
935 dev_dbg(ap->dev, "%s: done\n", __func__);
936 return 0;
937
938CLEANUP_ALLOC:
939 kfree(hsdevp);
940CLEANUP:
941 dev_dbg(ap->dev, "%s: fail. ap->id = %d\n", __func__, ap->print_id);
942 return err;
943}
944
945static void sata_dwc_port_stop(struct ata_port *ap)
946{
947 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
948 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
949
950 dev_dbg(ap->dev, "%s: ap->id = %d\n", __func__, ap->print_id);
951
952 dmaengine_terminate_sync(hsdevp->chan);
953 dma_release_channel(hsdevp->chan);
954 phy_power_off(hsdev->phy);
955
956 kfree(hsdevp);
957 ap->private_data = NULL;
958}
959
960/*
961 * Function : sata_dwc_exec_command_by_tag
962 * arguments : ata_port *ap, ata_taskfile *tf, u8 tag, u32 cmd_issued
963 * Return value : None
964 * This function keeps track of individual command tag ids and calls
965 * ata_exec_command in libata
966 */
967static void sata_dwc_exec_command_by_tag(struct ata_port *ap,
968 struct ata_taskfile *tf,
969 u8 tag, u32 cmd_issued)
970{
971 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
972
973 dev_dbg(ap->dev, "%s cmd(0x%02x): %s tag=%d\n", __func__, tf->command,
974 ata_get_cmd_descript(tf->command), tag);
975
976 hsdevp->cmd_issued[tag] = cmd_issued;
977
978 /*
979 * Clear SError before executing a new command.
980 * sata_dwc_scr_write and read can not be used here. Clearing the PM
981 * managed SError register for the disk needs to be done before the
982 * task file is loaded.
983 */
984 clear_serror(ap);
985 ata_sff_exec_command(ap, tf);
986}
987
988static void sata_dwc_bmdma_setup_by_tag(struct ata_queued_cmd *qc, u8 tag)
989{
990 sata_dwc_exec_command_by_tag(qc->ap, &qc->tf, tag,
991 SATA_DWC_CMD_ISSUED_PEND);
992}
993
994static void sata_dwc_bmdma_setup(struct ata_queued_cmd *qc)
995{
996 u8 tag = qc->hw_tag;
997
998 if (ata_is_ncq(qc->tf.protocol)) {
999 dev_dbg(qc->ap->dev, "%s: ap->link.sactive=0x%08x tag=%d\n",
1000 __func__, qc->ap->link.sactive, tag);
1001 } else {
1002 tag = 0;
1003 }
1004 sata_dwc_bmdma_setup_by_tag(qc, tag);
1005}
1006
1007static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag)
1008{
1009 int start_dma;
1010 u32 reg;
1011 struct sata_dwc_device *hsdev = HSDEV_FROM_QC(qc);
1012 struct ata_port *ap = qc->ap;
1013 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
1014 struct dma_async_tx_descriptor *desc = hsdevp->desc[tag];
1015 int dir = qc->dma_dir;
1016
1017 if (hsdevp->cmd_issued[tag] != SATA_DWC_CMD_ISSUED_NOT) {
1018 start_dma = 1;
1019 if (dir == DMA_TO_DEVICE)
1020 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_TX;
1021 else
1022 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_RX;
1023 } else {
1024 dev_err(ap->dev,
1025 "%s: Command not pending cmd_issued=%d (tag=%d) DMA NOT started\n",
1026 __func__, hsdevp->cmd_issued[tag], tag);
1027 start_dma = 0;
1028 }
1029
1030 dev_dbg(ap->dev,
1031 "%s qc=%p tag: %x cmd: 0x%02x dma_dir: %s start_dma? %x\n",
1032 __func__, qc, tag, qc->tf.command,
1033 get_dma_dir_descript(qc->dma_dir), start_dma);
1034 sata_dwc_tf_dump(ap, &qc->tf);
1035
1036 if (start_dma) {
1037 sata_dwc_scr_read(&ap->link, SCR_ERROR, ®);
1038 if (reg & SATA_DWC_SERROR_ERR_BITS) {
1039 dev_err(ap->dev, "%s: ****** SError=0x%08x ******\n",
1040 __func__, reg);
1041 }
1042
1043 if (dir == DMA_TO_DEVICE)
1044 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
1045 SATA_DWC_DMACR_TXCHEN);
1046 else
1047 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
1048 SATA_DWC_DMACR_RXCHEN);
1049
1050 /* Enable AHB DMA transfer on the specified channel */
1051 dmaengine_submit(desc);
1052 dma_async_issue_pending(hsdevp->chan);
1053 }
1054}
1055
1056static void sata_dwc_bmdma_start(struct ata_queued_cmd *qc)
1057{
1058 u8 tag = qc->hw_tag;
1059
1060 if (ata_is_ncq(qc->tf.protocol)) {
1061 dev_dbg(qc->ap->dev, "%s: ap->link.sactive=0x%08x tag=%d\n",
1062 __func__, qc->ap->link.sactive, tag);
1063 } else {
1064 tag = 0;
1065 }
1066 dev_dbg(qc->ap->dev, "%s\n", __func__);
1067 sata_dwc_bmdma_start_by_tag(qc, tag);
1068}
1069
1070static unsigned int sata_dwc_qc_issue(struct ata_queued_cmd *qc)
1071{
1072 u32 sactive;
1073 u8 tag = qc->hw_tag;
1074 struct ata_port *ap = qc->ap;
1075 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
1076
1077#ifdef DEBUG_NCQ
1078 if (qc->hw_tag > 0 || ap->link.sactive > 1)
1079 dev_info(ap->dev,
1080 "%s ap id=%d cmd(0x%02x)=%s qc tag=%d prot=%s ap active_tag=0x%08x ap sactive=0x%08x\n",
1081 __func__, ap->print_id, qc->tf.command,
1082 ata_get_cmd_descript(qc->tf.command),
1083 qc->hw_tag, get_prot_descript(qc->tf.protocol),
1084 ap->link.active_tag, ap->link.sactive);
1085#endif
1086
1087 if (!ata_is_ncq(qc->tf.protocol))
1088 tag = 0;
1089
1090 if (ata_is_dma(qc->tf.protocol)) {
1091 hsdevp->desc[tag] = dma_dwc_xfer_setup(qc);
1092 if (!hsdevp->desc[tag])
1093 return AC_ERR_SYSTEM;
1094 } else {
1095 hsdevp->desc[tag] = NULL;
1096 }
1097
1098 if (ata_is_ncq(qc->tf.protocol)) {
1099 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
1100 sactive |= (0x00000001 << tag);
1101 sata_dwc_scr_write(&ap->link, SCR_ACTIVE, sactive);
1102
1103 dev_dbg(qc->ap->dev,
1104 "%s: tag=%d ap->link.sactive = 0x%08x sactive=0x%08x\n",
1105 __func__, tag, qc->ap->link.sactive, sactive);
1106
1107 ap->ops->sff_tf_load(ap, &qc->tf);
1108 sata_dwc_exec_command_by_tag(ap, &qc->tf, tag,
1109 SATA_DWC_CMD_ISSUED_PEND);
1110 } else {
1111 return ata_bmdma_qc_issue(qc);
1112 }
1113 return 0;
1114}
1115
1116static void sata_dwc_error_handler(struct ata_port *ap)
1117{
1118 ata_sff_error_handler(ap);
1119}
1120
1121static int sata_dwc_hardreset(struct ata_link *link, unsigned int *class,
1122 unsigned long deadline)
1123{
1124 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(link->ap);
1125 int ret;
1126
1127 ret = sata_sff_hardreset(link, class, deadline);
1128
1129 sata_dwc_enable_interrupts(hsdev);
1130
1131 /* Reconfigure the DMA control register */
1132 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
1133 SATA_DWC_DMACR_TXRXCH_CLEAR);
1134
1135 /* Reconfigure the DMA Burst Transaction Size register */
1136 sata_dwc_writel(&hsdev->sata_dwc_regs->dbtsr,
1137 SATA_DWC_DBTSR_MWR(AHB_DMA_BRST_DFLT) |
1138 SATA_DWC_DBTSR_MRD(AHB_DMA_BRST_DFLT));
1139
1140 return ret;
1141}
1142
1143static void sata_dwc_dev_select(struct ata_port *ap, unsigned int device)
1144{
1145 /* SATA DWC is master only */
1146}
1147
1148/*
1149 * scsi mid-layer and libata interface structures
1150 */
1151static struct scsi_host_template sata_dwc_sht = {
1152 ATA_NCQ_SHT(DRV_NAME),
1153 /*
1154 * test-only: Currently this driver doesn't handle NCQ
1155 * correctly. We enable NCQ but set the queue depth to a
1156 * max of 1. This will get fixed in in a future release.
1157 */
1158 .sg_tablesize = LIBATA_MAX_PRD,
1159 /* .can_queue = ATA_MAX_QUEUE, */
1160 /*
1161 * Make sure a LLI block is not created that will span 8K max FIS
1162 * boundary. If the block spans such a FIS boundary, there is a chance
1163 * that a DMA burst will cross that boundary -- this results in an
1164 * error in the host controller.
1165 */
1166 .dma_boundary = 0x1fff /* ATA_DMA_BOUNDARY */,
1167};
1168
1169static struct ata_port_operations sata_dwc_ops = {
1170 .inherits = &ata_sff_port_ops,
1171
1172 .error_handler = sata_dwc_error_handler,
1173 .hardreset = sata_dwc_hardreset,
1174
1175 .qc_issue = sata_dwc_qc_issue,
1176
1177 .scr_read = sata_dwc_scr_read,
1178 .scr_write = sata_dwc_scr_write,
1179
1180 .port_start = sata_dwc_port_start,
1181 .port_stop = sata_dwc_port_stop,
1182
1183 .sff_dev_select = sata_dwc_dev_select,
1184
1185 .bmdma_setup = sata_dwc_bmdma_setup,
1186 .bmdma_start = sata_dwc_bmdma_start,
1187};
1188
1189static const struct ata_port_info sata_dwc_port_info[] = {
1190 {
1191 .flags = ATA_FLAG_SATA | ATA_FLAG_NCQ,
1192 .pio_mask = ATA_PIO4,
1193 .udma_mask = ATA_UDMA6,
1194 .port_ops = &sata_dwc_ops,
1195 },
1196};
1197
1198static int sata_dwc_probe(struct platform_device *ofdev)
1199{
1200 struct sata_dwc_device *hsdev;
1201 u32 idr, versionr;
1202 char *ver = (char *)&versionr;
1203 void __iomem *base;
1204 int err = 0;
1205 int irq;
1206 struct ata_host *host;
1207 struct ata_port_info pi = sata_dwc_port_info[0];
1208 const struct ata_port_info *ppi[] = { &pi, NULL };
1209 struct device_node *np = ofdev->dev.of_node;
1210 struct resource *res;
1211
1212 /* Allocate DWC SATA device */
1213 host = ata_host_alloc_pinfo(&ofdev->dev, ppi, SATA_DWC_MAX_PORTS);
1214 hsdev = devm_kzalloc(&ofdev->dev, sizeof(*hsdev), GFP_KERNEL);
1215 if (!host || !hsdev)
1216 return -ENOMEM;
1217
1218 host->private_data = hsdev;
1219
1220 /* Ioremap SATA registers */
1221 res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
1222 base = devm_ioremap_resource(&ofdev->dev, res);
1223 if (IS_ERR(base))
1224 return PTR_ERR(base);
1225 dev_dbg(&ofdev->dev, "ioremap done for SATA register address\n");
1226
1227 /* Synopsys DWC SATA specific Registers */
1228 hsdev->sata_dwc_regs = base + SATA_DWC_REG_OFFSET;
1229 hsdev->dmadr = res->start + SATA_DWC_REG_OFFSET + offsetof(struct sata_dwc_regs, dmadr);
1230
1231 /* Setup port */
1232 host->ports[0]->ioaddr.cmd_addr = base;
1233 host->ports[0]->ioaddr.scr_addr = base + SATA_DWC_SCR_OFFSET;
1234 sata_dwc_setup_port(&host->ports[0]->ioaddr, base);
1235
1236 /* Read the ID and Version Registers */
1237 idr = sata_dwc_readl(&hsdev->sata_dwc_regs->idr);
1238 versionr = sata_dwc_readl(&hsdev->sata_dwc_regs->versionr);
1239 dev_notice(&ofdev->dev, "id %d, controller version %c.%c%c\n",
1240 idr, ver[0], ver[1], ver[2]);
1241
1242 /* Save dev for later use in dev_xxx() routines */
1243 hsdev->dev = &ofdev->dev;
1244
1245 /* Enable SATA Interrupts */
1246 sata_dwc_enable_interrupts(hsdev);
1247
1248 /* Get SATA interrupt number */
1249 irq = irq_of_parse_and_map(np, 0);
1250 if (irq == NO_IRQ) {
1251 dev_err(&ofdev->dev, "no SATA DMA irq\n");
1252 err = -ENODEV;
1253 goto error_out;
1254 }
1255
1256#ifdef CONFIG_SATA_DWC_OLD_DMA
1257 if (!of_find_property(np, "dmas", NULL)) {
1258 err = sata_dwc_dma_init_old(ofdev, hsdev);
1259 if (err)
1260 goto error_out;
1261 }
1262#endif
1263
1264 hsdev->phy = devm_phy_optional_get(hsdev->dev, "sata-phy");
1265 if (IS_ERR(hsdev->phy)) {
1266 err = PTR_ERR(hsdev->phy);
1267 hsdev->phy = NULL;
1268 goto error_out;
1269 }
1270
1271 err = phy_init(hsdev->phy);
1272 if (err)
1273 goto error_out;
1274
1275 /*
1276 * Now, register with libATA core, this will also initiate the
1277 * device discovery process, invoking our port_start() handler &
1278 * error_handler() to execute a dummy Softreset EH session
1279 */
1280 err = ata_host_activate(host, irq, sata_dwc_isr, 0, &sata_dwc_sht);
1281 if (err)
1282 dev_err(&ofdev->dev, "failed to activate host");
1283
1284 return 0;
1285
1286error_out:
1287 phy_exit(hsdev->phy);
1288 return err;
1289}
1290
1291static int sata_dwc_remove(struct platform_device *ofdev)
1292{
1293 struct device *dev = &ofdev->dev;
1294 struct ata_host *host = dev_get_drvdata(dev);
1295 struct sata_dwc_device *hsdev = host->private_data;
1296
1297 ata_host_detach(host);
1298
1299 phy_exit(hsdev->phy);
1300
1301#ifdef CONFIG_SATA_DWC_OLD_DMA
1302 /* Free SATA DMA resources */
1303 sata_dwc_dma_exit_old(hsdev);
1304#endif
1305
1306 dev_dbg(&ofdev->dev, "done\n");
1307 return 0;
1308}
1309
1310static const struct of_device_id sata_dwc_match[] = {
1311 { .compatible = "amcc,sata-460ex", },
1312 {}
1313};
1314MODULE_DEVICE_TABLE(of, sata_dwc_match);
1315
1316static struct platform_driver sata_dwc_driver = {
1317 .driver = {
1318 .name = DRV_NAME,
1319 .of_match_table = sata_dwc_match,
1320 },
1321 .probe = sata_dwc_probe,
1322 .remove = sata_dwc_remove,
1323};
1324
1325module_platform_driver(sata_dwc_driver);
1326
1327MODULE_LICENSE("GPL");
1328MODULE_AUTHOR("Mark Miesfeld <mmiesfeld@amcc.com>");
1329MODULE_DESCRIPTION("DesignWare Cores SATA controller low level driver");
1330MODULE_VERSION(DRV_VERSION);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * drivers/ata/sata_dwc_460ex.c
4 *
5 * Synopsys DesignWare Cores (DWC) SATA host driver
6 *
7 * Author: Mark Miesfeld <mmiesfeld@amcc.com>
8 *
9 * Ported from 2.6.19.2 to 2.6.25/26 by Stefan Roese <sr@denx.de>
10 * Copyright 2008 DENX Software Engineering
11 *
12 * Based on versions provided by AMCC and Synopsys which are:
13 * Copyright 2006 Applied Micro Circuits Corporation
14 * COPYRIGHT (C) 2005 SYNOPSYS, INC. ALL RIGHTS RESERVED
15 */
16
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/device.h>
20#include <linux/dmaengine.h>
21#include <linux/of_address.h>
22#include <linux/of_irq.h>
23#include <linux/of_platform.h>
24#include <linux/platform_device.h>
25#include <linux/phy/phy.h>
26#include <linux/libata.h>
27#include <linux/slab.h>
28#include <trace/events/libata.h>
29
30#include "libata.h"
31
32#include <scsi/scsi_host.h>
33#include <scsi/scsi_cmnd.h>
34
35/* These two are defined in "libata.h" */
36#undef DRV_NAME
37#undef DRV_VERSION
38
39#define DRV_NAME "sata-dwc"
40#define DRV_VERSION "1.3"
41
42#define sata_dwc_writel(a, v) writel_relaxed(v, a)
43#define sata_dwc_readl(a) readl_relaxed(a)
44
45#define AHB_DMA_BRST_DFLT 64 /* 16 data items burst length */
46
47enum {
48 SATA_DWC_MAX_PORTS = 1,
49
50 SATA_DWC_SCR_OFFSET = 0x24,
51 SATA_DWC_REG_OFFSET = 0x64,
52};
53
54/* DWC SATA Registers */
55struct sata_dwc_regs {
56 u32 fptagr; /* 1st party DMA tag */
57 u32 fpbor; /* 1st party DMA buffer offset */
58 u32 fptcr; /* 1st party DMA Xfr count */
59 u32 dmacr; /* DMA Control */
60 u32 dbtsr; /* DMA Burst Transac size */
61 u32 intpr; /* Interrupt Pending */
62 u32 intmr; /* Interrupt Mask */
63 u32 errmr; /* Error Mask */
64 u32 llcr; /* Link Layer Control */
65 u32 phycr; /* PHY Control */
66 u32 physr; /* PHY Status */
67 u32 rxbistpd; /* Recvd BIST pattern def register */
68 u32 rxbistpd1; /* Recvd BIST data dword1 */
69 u32 rxbistpd2; /* Recvd BIST pattern data dword2 */
70 u32 txbistpd; /* Trans BIST pattern def register */
71 u32 txbistpd1; /* Trans BIST data dword1 */
72 u32 txbistpd2; /* Trans BIST data dword2 */
73 u32 bistcr; /* BIST Control Register */
74 u32 bistfctr; /* BIST FIS Count Register */
75 u32 bistsr; /* BIST Status Register */
76 u32 bistdecr; /* BIST Dword Error count register */
77 u32 res[15]; /* Reserved locations */
78 u32 testr; /* Test Register */
79 u32 versionr; /* Version Register */
80 u32 idr; /* ID Register */
81 u32 unimpl[192]; /* Unimplemented */
82 u32 dmadr[256]; /* FIFO Locations in DMA Mode */
83};
84
85enum {
86 SCR_SCONTROL_DET_ENABLE = 0x00000001,
87 SCR_SSTATUS_DET_PRESENT = 0x00000001,
88 SCR_SERROR_DIAG_X = 0x04000000,
89/* DWC SATA Register Operations */
90 SATA_DWC_TXFIFO_DEPTH = 0x01FF,
91 SATA_DWC_RXFIFO_DEPTH = 0x01FF,
92 SATA_DWC_DMACR_TMOD_TXCHEN = 0x00000004,
93 SATA_DWC_DMACR_TXCHEN = (0x00000001 | SATA_DWC_DMACR_TMOD_TXCHEN),
94 SATA_DWC_DMACR_RXCHEN = (0x00000002 | SATA_DWC_DMACR_TMOD_TXCHEN),
95 SATA_DWC_DMACR_TXRXCH_CLEAR = SATA_DWC_DMACR_TMOD_TXCHEN,
96 SATA_DWC_INTPR_DMAT = 0x00000001,
97 SATA_DWC_INTPR_NEWFP = 0x00000002,
98 SATA_DWC_INTPR_PMABRT = 0x00000004,
99 SATA_DWC_INTPR_ERR = 0x00000008,
100 SATA_DWC_INTPR_NEWBIST = 0x00000010,
101 SATA_DWC_INTPR_IPF = 0x10000000,
102 SATA_DWC_INTMR_DMATM = 0x00000001,
103 SATA_DWC_INTMR_NEWFPM = 0x00000002,
104 SATA_DWC_INTMR_PMABRTM = 0x00000004,
105 SATA_DWC_INTMR_ERRM = 0x00000008,
106 SATA_DWC_INTMR_NEWBISTM = 0x00000010,
107 SATA_DWC_LLCR_SCRAMEN = 0x00000001,
108 SATA_DWC_LLCR_DESCRAMEN = 0x00000002,
109 SATA_DWC_LLCR_RPDEN = 0x00000004,
110/* This is all error bits, zero's are reserved fields. */
111 SATA_DWC_SERROR_ERR_BITS = 0x0FFF0F03
112};
113
114#define SATA_DWC_SCR0_SPD_GET(v) (((v) >> 4) & 0x0000000F)
115#define SATA_DWC_DMACR_TX_CLEAR(v) (((v) & ~SATA_DWC_DMACR_TXCHEN) |\
116 SATA_DWC_DMACR_TMOD_TXCHEN)
117#define SATA_DWC_DMACR_RX_CLEAR(v) (((v) & ~SATA_DWC_DMACR_RXCHEN) |\
118 SATA_DWC_DMACR_TMOD_TXCHEN)
119#define SATA_DWC_DBTSR_MWR(size) (((size)/4) & SATA_DWC_TXFIFO_DEPTH)
120#define SATA_DWC_DBTSR_MRD(size) ((((size)/4) & SATA_DWC_RXFIFO_DEPTH)\
121 << 16)
122struct sata_dwc_device {
123 struct device *dev; /* generic device struct */
124 struct ata_probe_ent *pe; /* ptr to probe-ent */
125 struct ata_host *host;
126 struct sata_dwc_regs __iomem *sata_dwc_regs; /* DW SATA specific */
127 u32 sactive_issued;
128 u32 sactive_queued;
129 struct phy *phy;
130 phys_addr_t dmadr;
131#ifdef CONFIG_SATA_DWC_OLD_DMA
132 struct dw_dma_chip *dma;
133#endif
134};
135
136/*
137 * Allow one extra special slot for commands and DMA management
138 * to account for libata internal commands.
139 */
140#define SATA_DWC_QCMD_MAX (ATA_MAX_QUEUE + 1)
141
142struct sata_dwc_device_port {
143 struct sata_dwc_device *hsdev;
144 int cmd_issued[SATA_DWC_QCMD_MAX];
145 int dma_pending[SATA_DWC_QCMD_MAX];
146
147 /* DMA info */
148 struct dma_chan *chan;
149 struct dma_async_tx_descriptor *desc[SATA_DWC_QCMD_MAX];
150 u32 dma_interrupt_count;
151};
152
153/*
154 * Commonly used DWC SATA driver macros
155 */
156#define HSDEV_FROM_HOST(host) ((struct sata_dwc_device *)(host)->private_data)
157#define HSDEV_FROM_AP(ap) ((struct sata_dwc_device *)(ap)->host->private_data)
158#define HSDEVP_FROM_AP(ap) ((struct sata_dwc_device_port *)(ap)->private_data)
159#define HSDEV_FROM_QC(qc) ((struct sata_dwc_device *)(qc)->ap->host->private_data)
160#define HSDEV_FROM_HSDEVP(p) ((struct sata_dwc_device *)(p)->hsdev)
161
162enum {
163 SATA_DWC_CMD_ISSUED_NOT = 0,
164 SATA_DWC_CMD_ISSUED_PEND = 1,
165 SATA_DWC_CMD_ISSUED_EXEC = 2,
166 SATA_DWC_CMD_ISSUED_NODATA = 3,
167
168 SATA_DWC_DMA_PENDING_NONE = 0,
169 SATA_DWC_DMA_PENDING_TX = 1,
170 SATA_DWC_DMA_PENDING_RX = 2,
171};
172
173/*
174 * Prototypes
175 */
176static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag);
177static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc);
178static void sata_dwc_dma_xfer_complete(struct ata_port *ap);
179static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag);
180
181#ifdef CONFIG_SATA_DWC_OLD_DMA
182
183#include <linux/platform_data/dma-dw.h>
184#include <linux/dma/dw.h>
185
186static struct dw_dma_slave sata_dwc_dma_dws = {
187 .src_id = 0,
188 .dst_id = 0,
189 .m_master = 1,
190 .p_master = 0,
191};
192
193static bool sata_dwc_dma_filter(struct dma_chan *chan, void *param)
194{
195 struct dw_dma_slave *dws = &sata_dwc_dma_dws;
196
197 if (dws->dma_dev != chan->device->dev)
198 return false;
199
200 chan->private = dws;
201 return true;
202}
203
204static int sata_dwc_dma_get_channel_old(struct sata_dwc_device_port *hsdevp)
205{
206 struct sata_dwc_device *hsdev = hsdevp->hsdev;
207 struct dw_dma_slave *dws = &sata_dwc_dma_dws;
208 struct device *dev = hsdev->dev;
209 dma_cap_mask_t mask;
210
211 dws->dma_dev = dev;
212
213 dma_cap_zero(mask);
214 dma_cap_set(DMA_SLAVE, mask);
215
216 /* Acquire DMA channel */
217 hsdevp->chan = dma_request_channel(mask, sata_dwc_dma_filter, hsdevp);
218 if (!hsdevp->chan) {
219 dev_err(dev, "%s: dma channel unavailable\n", __func__);
220 return -EAGAIN;
221 }
222
223 return 0;
224}
225
226static int sata_dwc_dma_init_old(struct platform_device *pdev,
227 struct sata_dwc_device *hsdev)
228{
229 struct device *dev = &pdev->dev;
230 struct device_node *np = dev->of_node;
231
232 hsdev->dma = devm_kzalloc(dev, sizeof(*hsdev->dma), GFP_KERNEL);
233 if (!hsdev->dma)
234 return -ENOMEM;
235
236 hsdev->dma->dev = dev;
237 hsdev->dma->id = pdev->id;
238
239 /* Get SATA DMA interrupt number */
240 hsdev->dma->irq = irq_of_parse_and_map(np, 1);
241 if (!hsdev->dma->irq) {
242 dev_err(dev, "no SATA DMA irq\n");
243 return -ENODEV;
244 }
245
246 /* Get physical SATA DMA register base address */
247 hsdev->dma->regs = devm_platform_ioremap_resource(pdev, 1);
248 if (IS_ERR(hsdev->dma->regs))
249 return PTR_ERR(hsdev->dma->regs);
250
251 /* Initialize AHB DMAC */
252 return dw_dma_probe(hsdev->dma);
253}
254
255static void sata_dwc_dma_exit_old(struct sata_dwc_device *hsdev)
256{
257 if (!hsdev->dma)
258 return;
259
260 dw_dma_remove(hsdev->dma);
261}
262
263#endif
264
265static const char *get_prot_descript(u8 protocol)
266{
267 switch (protocol) {
268 case ATA_PROT_NODATA:
269 return "ATA no data";
270 case ATA_PROT_PIO:
271 return "ATA PIO";
272 case ATA_PROT_DMA:
273 return "ATA DMA";
274 case ATA_PROT_NCQ:
275 return "ATA NCQ";
276 case ATA_PROT_NCQ_NODATA:
277 return "ATA NCQ no data";
278 case ATAPI_PROT_NODATA:
279 return "ATAPI no data";
280 case ATAPI_PROT_PIO:
281 return "ATAPI PIO";
282 case ATAPI_PROT_DMA:
283 return "ATAPI DMA";
284 default:
285 return "unknown";
286 }
287}
288
289static void dma_dwc_xfer_done(void *hsdev_instance)
290{
291 unsigned long flags;
292 struct sata_dwc_device *hsdev = hsdev_instance;
293 struct ata_host *host = (struct ata_host *)hsdev->host;
294 struct ata_port *ap;
295 struct sata_dwc_device_port *hsdevp;
296 u8 tag = 0;
297 unsigned int port = 0;
298
299 spin_lock_irqsave(&host->lock, flags);
300 ap = host->ports[port];
301 hsdevp = HSDEVP_FROM_AP(ap);
302 tag = ap->link.active_tag;
303
304 /*
305 * Each DMA command produces 2 interrupts. Only
306 * complete the command after both interrupts have been
307 * seen. (See sata_dwc_isr())
308 */
309 hsdevp->dma_interrupt_count++;
310 sata_dwc_clear_dmacr(hsdevp, tag);
311
312 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_NONE) {
313 dev_err(ap->dev, "DMA not pending tag=0x%02x pending=%d\n",
314 tag, hsdevp->dma_pending[tag]);
315 }
316
317 if ((hsdevp->dma_interrupt_count % 2) == 0)
318 sata_dwc_dma_xfer_complete(ap);
319
320 spin_unlock_irqrestore(&host->lock, flags);
321}
322
323static struct dma_async_tx_descriptor *dma_dwc_xfer_setup(struct ata_queued_cmd *qc)
324{
325 struct ata_port *ap = qc->ap;
326 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
327 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
328 struct dma_slave_config sconf;
329 struct dma_async_tx_descriptor *desc;
330
331 if (qc->dma_dir == DMA_DEV_TO_MEM) {
332 sconf.src_addr = hsdev->dmadr;
333 sconf.device_fc = false;
334 } else { /* DMA_MEM_TO_DEV */
335 sconf.dst_addr = hsdev->dmadr;
336 sconf.device_fc = false;
337 }
338
339 sconf.direction = qc->dma_dir;
340 sconf.src_maxburst = AHB_DMA_BRST_DFLT / 4; /* in items */
341 sconf.dst_maxburst = AHB_DMA_BRST_DFLT / 4; /* in items */
342 sconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
343 sconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
344
345 dmaengine_slave_config(hsdevp->chan, &sconf);
346
347 /* Convert SG list to linked list of items (LLIs) for AHB DMA */
348 desc = dmaengine_prep_slave_sg(hsdevp->chan, qc->sg, qc->n_elem,
349 qc->dma_dir,
350 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
351
352 if (!desc)
353 return NULL;
354
355 desc->callback = dma_dwc_xfer_done;
356 desc->callback_param = hsdev;
357
358 dev_dbg(hsdev->dev, "%s sg: 0x%p, count: %d addr: %pa\n", __func__,
359 qc->sg, qc->n_elem, &hsdev->dmadr);
360
361 return desc;
362}
363
364static int sata_dwc_scr_read(struct ata_link *link, unsigned int scr, u32 *val)
365{
366 if (scr > SCR_NOTIFICATION) {
367 dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
368 __func__, scr);
369 return -EINVAL;
370 }
371
372 *val = sata_dwc_readl(link->ap->ioaddr.scr_addr + (scr * 4));
373 dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=0x%08x\n", __func__,
374 link->ap->print_id, scr, *val);
375
376 return 0;
377}
378
379static int sata_dwc_scr_write(struct ata_link *link, unsigned int scr, u32 val)
380{
381 dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=0x%08x\n", __func__,
382 link->ap->print_id, scr, val);
383 if (scr > SCR_NOTIFICATION) {
384 dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
385 __func__, scr);
386 return -EINVAL;
387 }
388 sata_dwc_writel(link->ap->ioaddr.scr_addr + (scr * 4), val);
389
390 return 0;
391}
392
393static void clear_serror(struct ata_port *ap)
394{
395 u32 val;
396 sata_dwc_scr_read(&ap->link, SCR_ERROR, &val);
397 sata_dwc_scr_write(&ap->link, SCR_ERROR, val);
398}
399
400static void clear_interrupt_bit(struct sata_dwc_device *hsdev, u32 bit)
401{
402 sata_dwc_writel(&hsdev->sata_dwc_regs->intpr,
403 sata_dwc_readl(&hsdev->sata_dwc_regs->intpr));
404}
405
406static u32 qcmd_tag_to_mask(u8 tag)
407{
408 return 0x00000001 << (tag & 0x1f);
409}
410
411/* See ahci.c */
412static void sata_dwc_error_intr(struct ata_port *ap,
413 struct sata_dwc_device *hsdev, uint intpr)
414{
415 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
416 struct ata_eh_info *ehi = &ap->link.eh_info;
417 unsigned int err_mask = 0, action = 0;
418 struct ata_queued_cmd *qc;
419 u32 serror;
420 u8 status, tag;
421
422 ata_ehi_clear_desc(ehi);
423
424 sata_dwc_scr_read(&ap->link, SCR_ERROR, &serror);
425 status = ap->ops->sff_check_status(ap);
426
427 tag = ap->link.active_tag;
428
429 dev_err(ap->dev,
430 "%s SCR_ERROR=0x%08x intpr=0x%08x status=0x%08x dma_intp=%d pending=%d issued=%d",
431 __func__, serror, intpr, status, hsdevp->dma_interrupt_count,
432 hsdevp->dma_pending[tag], hsdevp->cmd_issued[tag]);
433
434 /* Clear error register and interrupt bit */
435 clear_serror(ap);
436 clear_interrupt_bit(hsdev, SATA_DWC_INTPR_ERR);
437
438 /* This is the only error happening now. TODO check for exact error */
439
440 err_mask |= AC_ERR_HOST_BUS;
441 action |= ATA_EH_RESET;
442
443 /* Pass this on to EH */
444 ehi->serror |= serror;
445 ehi->action |= action;
446
447 qc = ata_qc_from_tag(ap, tag);
448 if (qc)
449 qc->err_mask |= err_mask;
450 else
451 ehi->err_mask |= err_mask;
452
453 ata_port_abort(ap);
454}
455
456/*
457 * Function : sata_dwc_isr
458 * arguments : irq, void *dev_instance, struct pt_regs *regs
459 * Return value : irqreturn_t - status of IRQ
460 * This Interrupt handler called via port ops registered function.
461 * .irq_handler = sata_dwc_isr
462 */
463static irqreturn_t sata_dwc_isr(int irq, void *dev_instance)
464{
465 struct ata_host *host = (struct ata_host *)dev_instance;
466 struct sata_dwc_device *hsdev = HSDEV_FROM_HOST(host);
467 struct ata_port *ap;
468 struct ata_queued_cmd *qc;
469 unsigned long flags;
470 u8 status, tag;
471 int handled, port = 0;
472 uint intpr, sactive, sactive2, tag_mask;
473 struct sata_dwc_device_port *hsdevp;
474 hsdev->sactive_issued = 0;
475
476 spin_lock_irqsave(&host->lock, flags);
477
478 /* Read the interrupt register */
479 intpr = sata_dwc_readl(&hsdev->sata_dwc_regs->intpr);
480
481 ap = host->ports[port];
482 hsdevp = HSDEVP_FROM_AP(ap);
483
484 dev_dbg(ap->dev, "%s intpr=0x%08x active_tag=%d\n", __func__, intpr,
485 ap->link.active_tag);
486
487 /* Check for error interrupt */
488 if (intpr & SATA_DWC_INTPR_ERR) {
489 sata_dwc_error_intr(ap, hsdev, intpr);
490 handled = 1;
491 goto DONE;
492 }
493
494 /* Check for DMA SETUP FIS (FP DMA) interrupt */
495 if (intpr & SATA_DWC_INTPR_NEWFP) {
496 clear_interrupt_bit(hsdev, SATA_DWC_INTPR_NEWFP);
497
498 tag = (u8)(sata_dwc_readl(&hsdev->sata_dwc_regs->fptagr));
499 dev_dbg(ap->dev, "%s: NEWFP tag=%d\n", __func__, tag);
500 if (hsdevp->cmd_issued[tag] != SATA_DWC_CMD_ISSUED_PEND)
501 dev_warn(ap->dev, "CMD tag=%d not pending?\n", tag);
502
503 hsdev->sactive_issued |= qcmd_tag_to_mask(tag);
504
505 qc = ata_qc_from_tag(ap, tag);
506 if (unlikely(!qc)) {
507 dev_err(ap->dev, "failed to get qc");
508 handled = 1;
509 goto DONE;
510 }
511 /*
512 * Start FP DMA for NCQ command. At this point the tag is the
513 * active tag. It is the tag that matches the command about to
514 * be completed.
515 */
516 trace_ata_bmdma_start(ap, &qc->tf, tag);
517 qc->ap->link.active_tag = tag;
518 sata_dwc_bmdma_start_by_tag(qc, tag);
519
520 handled = 1;
521 goto DONE;
522 }
523 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
524 tag_mask = (hsdev->sactive_issued | sactive) ^ sactive;
525
526 /* If no sactive issued and tag_mask is zero then this is not NCQ */
527 if (hsdev->sactive_issued == 0 && tag_mask == 0) {
528 if (ap->link.active_tag == ATA_TAG_POISON)
529 tag = 0;
530 else
531 tag = ap->link.active_tag;
532 qc = ata_qc_from_tag(ap, tag);
533
534 /* DEV interrupt w/ no active qc? */
535 if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) {
536 dev_err(ap->dev,
537 "%s interrupt with no active qc qc=%p\n",
538 __func__, qc);
539 ap->ops->sff_check_status(ap);
540 handled = 1;
541 goto DONE;
542 }
543 status = ap->ops->sff_check_status(ap);
544
545 qc->ap->link.active_tag = tag;
546 hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
547
548 if (status & ATA_ERR) {
549 dev_dbg(ap->dev, "interrupt ATA_ERR (0x%x)\n", status);
550 sata_dwc_qc_complete(ap, qc);
551 handled = 1;
552 goto DONE;
553 }
554
555 dev_dbg(ap->dev, "%s non-NCQ cmd interrupt, protocol: %s\n",
556 __func__, get_prot_descript(qc->tf.protocol));
557DRVSTILLBUSY:
558 if (ata_is_dma(qc->tf.protocol)) {
559 /*
560 * Each DMA transaction produces 2 interrupts. The DMAC
561 * transfer complete interrupt and the SATA controller
562 * operation done interrupt. The command should be
563 * completed only after both interrupts are seen.
564 */
565 hsdevp->dma_interrupt_count++;
566 if (hsdevp->dma_pending[tag] == \
567 SATA_DWC_DMA_PENDING_NONE) {
568 dev_err(ap->dev,
569 "%s: DMA not pending intpr=0x%08x status=0x%08x pending=%d\n",
570 __func__, intpr, status,
571 hsdevp->dma_pending[tag]);
572 }
573
574 if ((hsdevp->dma_interrupt_count % 2) == 0)
575 sata_dwc_dma_xfer_complete(ap);
576 } else if (ata_is_pio(qc->tf.protocol)) {
577 ata_sff_hsm_move(ap, qc, status, 0);
578 handled = 1;
579 goto DONE;
580 } else {
581 if (unlikely(sata_dwc_qc_complete(ap, qc)))
582 goto DRVSTILLBUSY;
583 }
584
585 handled = 1;
586 goto DONE;
587 }
588
589 /*
590 * This is a NCQ command. At this point we need to figure out for which
591 * tags we have gotten a completion interrupt. One interrupt may serve
592 * as completion for more than one operation when commands are queued
593 * (NCQ). We need to process each completed command.
594 */
595
596 /* process completed commands */
597 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
598 tag_mask = (hsdev->sactive_issued | sactive) ^ sactive;
599
600 if (sactive != 0 || hsdev->sactive_issued > 1 || tag_mask > 1) {
601 dev_dbg(ap->dev,
602 "%s NCQ:sactive=0x%08x sactive_issued=0x%08x tag_mask=0x%08x\n",
603 __func__, sactive, hsdev->sactive_issued, tag_mask);
604 }
605
606 if ((tag_mask | hsdev->sactive_issued) != hsdev->sactive_issued) {
607 dev_warn(ap->dev,
608 "Bad tag mask? sactive=0x%08x sactive_issued=0x%08x tag_mask=0x%08x\n",
609 sactive, hsdev->sactive_issued, tag_mask);
610 }
611
612 /* read just to clear ... not bad if currently still busy */
613 status = ap->ops->sff_check_status(ap);
614 dev_dbg(ap->dev, "%s ATA status register=0x%x\n", __func__, status);
615
616 tag = 0;
617 while (tag_mask) {
618 while (!(tag_mask & 0x00000001)) {
619 tag++;
620 tag_mask <<= 1;
621 }
622
623 tag_mask &= (~0x00000001);
624 qc = ata_qc_from_tag(ap, tag);
625 if (unlikely(!qc)) {
626 dev_err(ap->dev, "failed to get qc");
627 handled = 1;
628 goto DONE;
629 }
630
631 /* To be picked up by completion functions */
632 qc->ap->link.active_tag = tag;
633 hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
634
635 /* Let libata/scsi layers handle error */
636 if (status & ATA_ERR) {
637 dev_dbg(ap->dev, "%s ATA_ERR (0x%x)\n", __func__,
638 status);
639 sata_dwc_qc_complete(ap, qc);
640 handled = 1;
641 goto DONE;
642 }
643
644 /* Process completed command */
645 dev_dbg(ap->dev, "%s NCQ command, protocol: %s\n", __func__,
646 get_prot_descript(qc->tf.protocol));
647 if (ata_is_dma(qc->tf.protocol)) {
648 hsdevp->dma_interrupt_count++;
649 if (hsdevp->dma_pending[tag] == \
650 SATA_DWC_DMA_PENDING_NONE)
651 dev_warn(ap->dev, "%s: DMA not pending?\n",
652 __func__);
653 if ((hsdevp->dma_interrupt_count % 2) == 0)
654 sata_dwc_dma_xfer_complete(ap);
655 } else {
656 if (unlikely(sata_dwc_qc_complete(ap, qc)))
657 goto STILLBUSY;
658 }
659 continue;
660
661STILLBUSY:
662 ap->stats.idle_irq++;
663 dev_warn(ap->dev, "STILL BUSY IRQ ata%d: irq trap\n",
664 ap->print_id);
665 } /* while tag_mask */
666
667 /*
668 * Check to see if any commands completed while we were processing our
669 * initial set of completed commands (read status clears interrupts,
670 * so we might miss a completed command interrupt if one came in while
671 * we were processing --we read status as part of processing a completed
672 * command).
673 */
674 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive2);
675 if (sactive2 != sactive) {
676 dev_dbg(ap->dev,
677 "More completed - sactive=0x%x sactive2=0x%x\n",
678 sactive, sactive2);
679 }
680 handled = 1;
681
682DONE:
683 spin_unlock_irqrestore(&host->lock, flags);
684 return IRQ_RETVAL(handled);
685}
686
687static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag)
688{
689 struct sata_dwc_device *hsdev = HSDEV_FROM_HSDEVP(hsdevp);
690 u32 dmacr = sata_dwc_readl(&hsdev->sata_dwc_regs->dmacr);
691
692 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_RX) {
693 dmacr = SATA_DWC_DMACR_RX_CLEAR(dmacr);
694 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr, dmacr);
695 } else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_TX) {
696 dmacr = SATA_DWC_DMACR_TX_CLEAR(dmacr);
697 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr, dmacr);
698 } else {
699 /*
700 * This should not happen, it indicates the driver is out of
701 * sync. If it does happen, clear dmacr anyway.
702 */
703 dev_err(hsdev->dev,
704 "%s DMA protocol RX and TX DMA not pending tag=0x%02x pending=%d dmacr: 0x%08x\n",
705 __func__, tag, hsdevp->dma_pending[tag], dmacr);
706 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
707 SATA_DWC_DMACR_TXRXCH_CLEAR);
708 }
709}
710
711static void sata_dwc_dma_xfer_complete(struct ata_port *ap)
712{
713 struct ata_queued_cmd *qc;
714 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
715 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
716 u8 tag = 0;
717
718 tag = ap->link.active_tag;
719 qc = ata_qc_from_tag(ap, tag);
720 if (!qc) {
721 dev_err(ap->dev, "failed to get qc");
722 return;
723 }
724
725 if (ata_is_dma(qc->tf.protocol)) {
726 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_NONE) {
727 dev_err(ap->dev,
728 "%s DMA protocol RX and TX DMA not pending dmacr: 0x%08x\n",
729 __func__,
730 sata_dwc_readl(&hsdev->sata_dwc_regs->dmacr));
731 }
732
733 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_NONE;
734 sata_dwc_qc_complete(ap, qc);
735 ap->link.active_tag = ATA_TAG_POISON;
736 } else {
737 sata_dwc_qc_complete(ap, qc);
738 }
739}
740
741static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc)
742{
743 u8 status = 0;
744 u32 mask = 0x0;
745 u8 tag = qc->hw_tag;
746 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
747 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
748 hsdev->sactive_queued = 0;
749
750 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_TX)
751 dev_err(ap->dev, "TX DMA PENDING\n");
752 else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_RX)
753 dev_err(ap->dev, "RX DMA PENDING\n");
754 dev_dbg(ap->dev,
755 "QC complete cmd=0x%02x status=0x%02x ata%u: protocol=%d\n",
756 qc->tf.command, status, ap->print_id, qc->tf.protocol);
757
758 /* clear active bit */
759 mask = (~(qcmd_tag_to_mask(tag)));
760 hsdev->sactive_queued = hsdev->sactive_queued & mask;
761 hsdev->sactive_issued = hsdev->sactive_issued & mask;
762 ata_qc_complete(qc);
763 return 0;
764}
765
766static void sata_dwc_enable_interrupts(struct sata_dwc_device *hsdev)
767{
768 /* Enable selective interrupts by setting the interrupt maskregister*/
769 sata_dwc_writel(&hsdev->sata_dwc_regs->intmr,
770 SATA_DWC_INTMR_ERRM |
771 SATA_DWC_INTMR_NEWFPM |
772 SATA_DWC_INTMR_PMABRTM |
773 SATA_DWC_INTMR_DMATM);
774 /*
775 * Unmask the error bits that should trigger an error interrupt by
776 * setting the error mask register.
777 */
778 sata_dwc_writel(&hsdev->sata_dwc_regs->errmr, SATA_DWC_SERROR_ERR_BITS);
779
780 dev_dbg(hsdev->dev, "%s: INTMR = 0x%08x, ERRMR = 0x%08x\n",
781 __func__, sata_dwc_readl(&hsdev->sata_dwc_regs->intmr),
782 sata_dwc_readl(&hsdev->sata_dwc_regs->errmr));
783}
784
785static void sata_dwc_setup_port(struct ata_ioports *port, void __iomem *base)
786{
787 port->cmd_addr = base + 0x00;
788 port->data_addr = base + 0x00;
789
790 port->error_addr = base + 0x04;
791 port->feature_addr = base + 0x04;
792
793 port->nsect_addr = base + 0x08;
794
795 port->lbal_addr = base + 0x0c;
796 port->lbam_addr = base + 0x10;
797 port->lbah_addr = base + 0x14;
798
799 port->device_addr = base + 0x18;
800 port->command_addr = base + 0x1c;
801 port->status_addr = base + 0x1c;
802
803 port->altstatus_addr = base + 0x20;
804 port->ctl_addr = base + 0x20;
805}
806
807static int sata_dwc_dma_get_channel(struct sata_dwc_device_port *hsdevp)
808{
809 struct sata_dwc_device *hsdev = hsdevp->hsdev;
810 struct device *dev = hsdev->dev;
811
812#ifdef CONFIG_SATA_DWC_OLD_DMA
813 if (!of_find_property(dev->of_node, "dmas", NULL))
814 return sata_dwc_dma_get_channel_old(hsdevp);
815#endif
816
817 hsdevp->chan = dma_request_chan(dev, "sata-dma");
818 if (IS_ERR(hsdevp->chan)) {
819 dev_err(dev, "failed to allocate dma channel: %ld\n",
820 PTR_ERR(hsdevp->chan));
821 return PTR_ERR(hsdevp->chan);
822 }
823
824 return 0;
825}
826
827/*
828 * Function : sata_dwc_port_start
829 * arguments : struct ata_ioports *port
830 * Return value : returns 0 if success, error code otherwise
831 * This function allocates the scatter gather LLI table for AHB DMA
832 */
833static int sata_dwc_port_start(struct ata_port *ap)
834{
835 int err = 0;
836 struct sata_dwc_device *hsdev;
837 struct sata_dwc_device_port *hsdevp = NULL;
838 struct device *pdev;
839 int i;
840
841 hsdev = HSDEV_FROM_AP(ap);
842
843 dev_dbg(ap->dev, "%s: port_no=%d\n", __func__, ap->port_no);
844
845 hsdev->host = ap->host;
846 pdev = ap->host->dev;
847 if (!pdev) {
848 dev_err(ap->dev, "%s: no ap->host->dev\n", __func__);
849 err = -ENODEV;
850 goto CLEANUP;
851 }
852
853 /* Allocate Port Struct */
854 hsdevp = kzalloc(sizeof(*hsdevp), GFP_KERNEL);
855 if (!hsdevp) {
856 err = -ENOMEM;
857 goto CLEANUP;
858 }
859 hsdevp->hsdev = hsdev;
860
861 err = sata_dwc_dma_get_channel(hsdevp);
862 if (err)
863 goto CLEANUP_ALLOC;
864
865 err = phy_power_on(hsdev->phy);
866 if (err)
867 goto CLEANUP_ALLOC;
868
869 for (i = 0; i < SATA_DWC_QCMD_MAX; i++)
870 hsdevp->cmd_issued[i] = SATA_DWC_CMD_ISSUED_NOT;
871
872 ap->bmdma_prd = NULL; /* set these so libata doesn't use them */
873 ap->bmdma_prd_dma = 0;
874
875 if (ap->port_no == 0) {
876 dev_dbg(ap->dev, "%s: clearing TXCHEN, RXCHEN in DMAC\n",
877 __func__);
878 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
879 SATA_DWC_DMACR_TXRXCH_CLEAR);
880
881 dev_dbg(ap->dev, "%s: setting burst size in DBTSR\n",
882 __func__);
883 sata_dwc_writel(&hsdev->sata_dwc_regs->dbtsr,
884 (SATA_DWC_DBTSR_MWR(AHB_DMA_BRST_DFLT) |
885 SATA_DWC_DBTSR_MRD(AHB_DMA_BRST_DFLT)));
886 }
887
888 /* Clear any error bits before libata starts issuing commands */
889 clear_serror(ap);
890 ap->private_data = hsdevp;
891 dev_dbg(ap->dev, "%s: done\n", __func__);
892 return 0;
893
894CLEANUP_ALLOC:
895 kfree(hsdevp);
896CLEANUP:
897 dev_dbg(ap->dev, "%s: fail. ap->id = %d\n", __func__, ap->print_id);
898 return err;
899}
900
901static void sata_dwc_port_stop(struct ata_port *ap)
902{
903 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
904 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
905
906 dev_dbg(ap->dev, "%s: ap->id = %d\n", __func__, ap->print_id);
907
908 dmaengine_terminate_sync(hsdevp->chan);
909 dma_release_channel(hsdevp->chan);
910 phy_power_off(hsdev->phy);
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 */
923static void sata_dwc_exec_command_by_tag(struct ata_port *ap,
924 struct ata_taskfile *tf,
925 u8 tag, u32 cmd_issued)
926{
927 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
928
929 hsdevp->cmd_issued[tag] = cmd_issued;
930
931 /*
932 * Clear SError before executing a new command.
933 * sata_dwc_scr_write and read can not be used here. Clearing the PM
934 * managed SError register for the disk needs to be done before the
935 * task file is loaded.
936 */
937 clear_serror(ap);
938 ata_sff_exec_command(ap, tf);
939}
940
941static void sata_dwc_bmdma_setup_by_tag(struct ata_queued_cmd *qc, u8 tag)
942{
943 sata_dwc_exec_command_by_tag(qc->ap, &qc->tf, tag,
944 SATA_DWC_CMD_ISSUED_PEND);
945}
946
947static void sata_dwc_bmdma_setup(struct ata_queued_cmd *qc)
948{
949 u8 tag = qc->hw_tag;
950
951 if (!ata_is_ncq(qc->tf.protocol))
952 tag = 0;
953
954 sata_dwc_bmdma_setup_by_tag(qc, tag);
955}
956
957static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag)
958{
959 int start_dma;
960 u32 reg;
961 struct sata_dwc_device *hsdev = HSDEV_FROM_QC(qc);
962 struct ata_port *ap = qc->ap;
963 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
964 struct dma_async_tx_descriptor *desc = hsdevp->desc[tag];
965 int dir = qc->dma_dir;
966
967 if (hsdevp->cmd_issued[tag] != SATA_DWC_CMD_ISSUED_NOT) {
968 start_dma = 1;
969 if (dir == DMA_TO_DEVICE)
970 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_TX;
971 else
972 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_RX;
973 } else {
974 dev_err(ap->dev,
975 "%s: Command not pending cmd_issued=%d (tag=%d) DMA NOT started\n",
976 __func__, hsdevp->cmd_issued[tag], tag);
977 start_dma = 0;
978 }
979
980 if (start_dma) {
981 sata_dwc_scr_read(&ap->link, SCR_ERROR, ®);
982 if (reg & SATA_DWC_SERROR_ERR_BITS) {
983 dev_err(ap->dev, "%s: ****** SError=0x%08x ******\n",
984 __func__, reg);
985 }
986
987 if (dir == DMA_TO_DEVICE)
988 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
989 SATA_DWC_DMACR_TXCHEN);
990 else
991 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
992 SATA_DWC_DMACR_RXCHEN);
993
994 /* Enable AHB DMA transfer on the specified channel */
995 dmaengine_submit(desc);
996 dma_async_issue_pending(hsdevp->chan);
997 }
998}
999
1000static void sata_dwc_bmdma_start(struct ata_queued_cmd *qc)
1001{
1002 u8 tag = qc->hw_tag;
1003
1004 if (!ata_is_ncq(qc->tf.protocol))
1005 tag = 0;
1006
1007 sata_dwc_bmdma_start_by_tag(qc, tag);
1008}
1009
1010static unsigned int sata_dwc_qc_issue(struct ata_queued_cmd *qc)
1011{
1012 u32 sactive;
1013 u8 tag = qc->hw_tag;
1014 struct ata_port *ap = qc->ap;
1015 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
1016
1017 if (!ata_is_ncq(qc->tf.protocol))
1018 tag = 0;
1019
1020 if (ata_is_dma(qc->tf.protocol)) {
1021 hsdevp->desc[tag] = dma_dwc_xfer_setup(qc);
1022 if (!hsdevp->desc[tag])
1023 return AC_ERR_SYSTEM;
1024 } else {
1025 hsdevp->desc[tag] = NULL;
1026 }
1027
1028 if (ata_is_ncq(qc->tf.protocol)) {
1029 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
1030 sactive |= (0x00000001 << tag);
1031 sata_dwc_scr_write(&ap->link, SCR_ACTIVE, sactive);
1032
1033 trace_ata_tf_load(ap, &qc->tf);
1034 ap->ops->sff_tf_load(ap, &qc->tf);
1035 trace_ata_exec_command(ap, &qc->tf, tag);
1036 sata_dwc_exec_command_by_tag(ap, &qc->tf, tag,
1037 SATA_DWC_CMD_ISSUED_PEND);
1038 } else {
1039 return ata_bmdma_qc_issue(qc);
1040 }
1041 return 0;
1042}
1043
1044static void sata_dwc_error_handler(struct ata_port *ap)
1045{
1046 ata_sff_error_handler(ap);
1047}
1048
1049static int sata_dwc_hardreset(struct ata_link *link, unsigned int *class,
1050 unsigned long deadline)
1051{
1052 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(link->ap);
1053 int ret;
1054
1055 ret = sata_sff_hardreset(link, class, deadline);
1056
1057 sata_dwc_enable_interrupts(hsdev);
1058
1059 /* Reconfigure the DMA control register */
1060 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
1061 SATA_DWC_DMACR_TXRXCH_CLEAR);
1062
1063 /* Reconfigure the DMA Burst Transaction Size register */
1064 sata_dwc_writel(&hsdev->sata_dwc_regs->dbtsr,
1065 SATA_DWC_DBTSR_MWR(AHB_DMA_BRST_DFLT) |
1066 SATA_DWC_DBTSR_MRD(AHB_DMA_BRST_DFLT));
1067
1068 return ret;
1069}
1070
1071static void sata_dwc_dev_select(struct ata_port *ap, unsigned int device)
1072{
1073 /* SATA DWC is master only */
1074}
1075
1076/*
1077 * scsi mid-layer and libata interface structures
1078 */
1079static struct scsi_host_template sata_dwc_sht = {
1080 ATA_NCQ_SHT(DRV_NAME),
1081 /*
1082 * test-only: Currently this driver doesn't handle NCQ
1083 * correctly. We enable NCQ but set the queue depth to a
1084 * max of 1. This will get fixed in in a future release.
1085 */
1086 .sg_tablesize = LIBATA_MAX_PRD,
1087 /* .can_queue = ATA_MAX_QUEUE, */
1088 /*
1089 * Make sure a LLI block is not created that will span 8K max FIS
1090 * boundary. If the block spans such a FIS boundary, there is a chance
1091 * that a DMA burst will cross that boundary -- this results in an
1092 * error in the host controller.
1093 */
1094 .dma_boundary = 0x1fff /* ATA_DMA_BOUNDARY */,
1095};
1096
1097static struct ata_port_operations sata_dwc_ops = {
1098 .inherits = &ata_sff_port_ops,
1099
1100 .error_handler = sata_dwc_error_handler,
1101 .hardreset = sata_dwc_hardreset,
1102
1103 .qc_issue = sata_dwc_qc_issue,
1104
1105 .scr_read = sata_dwc_scr_read,
1106 .scr_write = sata_dwc_scr_write,
1107
1108 .port_start = sata_dwc_port_start,
1109 .port_stop = sata_dwc_port_stop,
1110
1111 .sff_dev_select = sata_dwc_dev_select,
1112
1113 .bmdma_setup = sata_dwc_bmdma_setup,
1114 .bmdma_start = sata_dwc_bmdma_start,
1115};
1116
1117static const struct ata_port_info sata_dwc_port_info[] = {
1118 {
1119 .flags = ATA_FLAG_SATA | ATA_FLAG_NCQ,
1120 .pio_mask = ATA_PIO4,
1121 .udma_mask = ATA_UDMA6,
1122 .port_ops = &sata_dwc_ops,
1123 },
1124};
1125
1126static int sata_dwc_probe(struct platform_device *ofdev)
1127{
1128 struct device *dev = &ofdev->dev;
1129 struct device_node *np = dev->of_node;
1130 struct sata_dwc_device *hsdev;
1131 u32 idr, versionr;
1132 char *ver = (char *)&versionr;
1133 void __iomem *base;
1134 int err = 0;
1135 int irq;
1136 struct ata_host *host;
1137 struct ata_port_info pi = sata_dwc_port_info[0];
1138 const struct ata_port_info *ppi[] = { &pi, NULL };
1139 struct resource *res;
1140
1141 /* Allocate DWC SATA device */
1142 host = ata_host_alloc_pinfo(dev, ppi, SATA_DWC_MAX_PORTS);
1143 hsdev = devm_kzalloc(dev, sizeof(*hsdev), GFP_KERNEL);
1144 if (!host || !hsdev)
1145 return -ENOMEM;
1146
1147 host->private_data = hsdev;
1148
1149 /* Ioremap SATA registers */
1150 base = devm_platform_get_and_ioremap_resource(ofdev, 0, &res);
1151 if (IS_ERR(base))
1152 return PTR_ERR(base);
1153 dev_dbg(dev, "ioremap done for SATA register address\n");
1154
1155 /* Synopsys DWC SATA specific Registers */
1156 hsdev->sata_dwc_regs = base + SATA_DWC_REG_OFFSET;
1157 hsdev->dmadr = res->start + SATA_DWC_REG_OFFSET + offsetof(struct sata_dwc_regs, dmadr);
1158
1159 /* Setup port */
1160 host->ports[0]->ioaddr.cmd_addr = base;
1161 host->ports[0]->ioaddr.scr_addr = base + SATA_DWC_SCR_OFFSET;
1162 sata_dwc_setup_port(&host->ports[0]->ioaddr, base);
1163
1164 /* Read the ID and Version Registers */
1165 idr = sata_dwc_readl(&hsdev->sata_dwc_regs->idr);
1166 versionr = sata_dwc_readl(&hsdev->sata_dwc_regs->versionr);
1167 dev_notice(dev, "id %d, controller version %c.%c%c\n", idr, ver[0], ver[1], ver[2]);
1168
1169 /* Save dev for later use in dev_xxx() routines */
1170 hsdev->dev = dev;
1171
1172 /* Enable SATA Interrupts */
1173 sata_dwc_enable_interrupts(hsdev);
1174
1175 /* Get SATA interrupt number */
1176 irq = irq_of_parse_and_map(np, 0);
1177 if (!irq) {
1178 dev_err(dev, "no SATA DMA irq\n");
1179 return -ENODEV;
1180 }
1181
1182#ifdef CONFIG_SATA_DWC_OLD_DMA
1183 if (!of_find_property(np, "dmas", NULL)) {
1184 err = sata_dwc_dma_init_old(ofdev, hsdev);
1185 if (err)
1186 return err;
1187 }
1188#endif
1189
1190 hsdev->phy = devm_phy_optional_get(dev, "sata-phy");
1191 if (IS_ERR(hsdev->phy))
1192 return PTR_ERR(hsdev->phy);
1193
1194 err = phy_init(hsdev->phy);
1195 if (err)
1196 goto error_out;
1197
1198 /*
1199 * Now, register with libATA core, this will also initiate the
1200 * device discovery process, invoking our port_start() handler &
1201 * error_handler() to execute a dummy Softreset EH session
1202 */
1203 err = ata_host_activate(host, irq, sata_dwc_isr, 0, &sata_dwc_sht);
1204 if (err)
1205 dev_err(dev, "failed to activate host");
1206
1207 return 0;
1208
1209error_out:
1210 phy_exit(hsdev->phy);
1211 return err;
1212}
1213
1214static int sata_dwc_remove(struct platform_device *ofdev)
1215{
1216 struct device *dev = &ofdev->dev;
1217 struct ata_host *host = dev_get_drvdata(dev);
1218 struct sata_dwc_device *hsdev = host->private_data;
1219
1220 ata_host_detach(host);
1221
1222 phy_exit(hsdev->phy);
1223
1224#ifdef CONFIG_SATA_DWC_OLD_DMA
1225 /* Free SATA DMA resources */
1226 sata_dwc_dma_exit_old(hsdev);
1227#endif
1228
1229 dev_dbg(dev, "done\n");
1230 return 0;
1231}
1232
1233static const struct of_device_id sata_dwc_match[] = {
1234 { .compatible = "amcc,sata-460ex", },
1235 {}
1236};
1237MODULE_DEVICE_TABLE(of, sata_dwc_match);
1238
1239static struct platform_driver sata_dwc_driver = {
1240 .driver = {
1241 .name = DRV_NAME,
1242 .of_match_table = sata_dwc_match,
1243 },
1244 .probe = sata_dwc_probe,
1245 .remove = sata_dwc_remove,
1246};
1247
1248module_platform_driver(sata_dwc_driver);
1249
1250MODULE_LICENSE("GPL");
1251MODULE_AUTHOR("Mark Miesfeld <mmiesfeld@amcc.com>");
1252MODULE_DESCRIPTION("DesignWare Cores SATA controller low level driver");
1253MODULE_VERSION(DRV_VERSION);