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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / ata / sata_rcar.c
blob2b25bd83fc9d46a2682a0affb409ccf7488abe3d
1 /*
2 * Renesas R-Car SATA driver
3 *
4 * Author: Vladimir Barinov <source@cogentembedded.com>
5 * Copyright (C) 2013 Cogent Embedded, Inc.
6 * Copyright (C) 2013 Renesas Solutions Corp.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/ata.h>
17 #include <linux/libata.h>
18 #include <linux/of_device.h>
19 #include <linux/platform_device.h>
20 #include <linux/clk.h>
21 #include <linux/err.h>
22
23 #define DRV_NAME "sata_rcar"
24
25 /* SH-Navi2G/ATAPI-ATA compatible task registers */
26 #define DATA_REG 0x100
27 #define SDEVCON_REG 0x138
28
29 /* SH-Navi2G/ATAPI module compatible control registers */
30 #define ATAPI_CONTROL1_REG 0x180
31 #define ATAPI_STATUS_REG 0x184
32 #define ATAPI_INT_ENABLE_REG 0x188
33 #define ATAPI_DTB_ADR_REG 0x198
34 #define ATAPI_DMA_START_ADR_REG 0x19C
35 #define ATAPI_DMA_TRANS_CNT_REG 0x1A0
36 #define ATAPI_CONTROL2_REG 0x1A4
37 #define ATAPI_SIG_ST_REG 0x1B0
38 #define ATAPI_BYTE_SWAP_REG 0x1BC
39
40 /* ATAPI control 1 register (ATAPI_CONTROL1) bits */
41 #define ATAPI_CONTROL1_ISM BIT(16)
42 #define ATAPI_CONTROL1_DTA32M BIT(11)
43 #define ATAPI_CONTROL1_RESET BIT(7)
44 #define ATAPI_CONTROL1_DESE BIT(3)
45 #define ATAPI_CONTROL1_RW BIT(2)
46 #define ATAPI_CONTROL1_STOP BIT(1)
47 #define ATAPI_CONTROL1_START BIT(0)
48
49 /* ATAPI status register (ATAPI_STATUS) bits */
50 #define ATAPI_STATUS_SATAINT BIT(11)
51 #define ATAPI_STATUS_DNEND BIT(6)
52 #define ATAPI_STATUS_DEVTRM BIT(5)
53 #define ATAPI_STATUS_DEVINT BIT(4)
54 #define ATAPI_STATUS_ERR BIT(2)
55 #define ATAPI_STATUS_NEND BIT(1)
56 #define ATAPI_STATUS_ACT BIT(0)
57
58 /* Interrupt enable register (ATAPI_INT_ENABLE) bits */
59 #define ATAPI_INT_ENABLE_SATAINT BIT(11)
60 #define ATAPI_INT_ENABLE_DNEND BIT(6)
61 #define ATAPI_INT_ENABLE_DEVTRM BIT(5)
62 #define ATAPI_INT_ENABLE_DEVINT BIT(4)
63 #define ATAPI_INT_ENABLE_ERR BIT(2)
64 #define ATAPI_INT_ENABLE_NEND BIT(1)
65 #define ATAPI_INT_ENABLE_ACT BIT(0)
66
67 /* Access control registers for physical layer control register */
68 #define SATAPHYADDR_REG 0x200
69 #define SATAPHYWDATA_REG 0x204
70 #define SATAPHYACCEN_REG 0x208
71 #define SATAPHYRESET_REG 0x20C
72 #define SATAPHYRDATA_REG 0x210
73 #define SATAPHYACK_REG 0x214
74
75 /* Physical layer control address command register (SATAPHYADDR) bits */
76 #define SATAPHYADDR_PHYRATEMODE BIT(10)
77 #define SATAPHYADDR_PHYCMD_READ BIT(9)
78 #define SATAPHYADDR_PHYCMD_WRITE BIT(8)
79
80 /* Physical layer control enable register (SATAPHYACCEN) bits */
81 #define SATAPHYACCEN_PHYLANE BIT(0)
82
83 /* Physical layer control reset register (SATAPHYRESET) bits */
84 #define SATAPHYRESET_PHYRST BIT(1)
85 #define SATAPHYRESET_PHYSRES BIT(0)
86
87 /* Physical layer control acknowledge register (SATAPHYACK) bits */
88 #define SATAPHYACK_PHYACK BIT(0)
89
90 /* Serial-ATA HOST control registers */
91 #define BISTCONF_REG 0x102C
92 #define SDATA_REG 0x1100
93 #define SSDEVCON_REG 0x1204
94
95 #define SCRSSTS_REG 0x1400
96 #define SCRSERR_REG 0x1404
97 #define SCRSCON_REG 0x1408
98 #define SCRSACT_REG 0x140C
99
100 #define SATAINTSTAT_REG 0x1508
101 #define SATAINTMASK_REG 0x150C
102
103 /* SATA INT status register (SATAINTSTAT) bits */
104 #define SATAINTSTAT_SERR BIT(3)
105 #define SATAINTSTAT_ATA BIT(0)
106
107 /* SATA INT mask register (SATAINTSTAT) bits */
108 #define SATAINTMASK_SERRMSK BIT(3)
109 #define SATAINTMASK_ERRMSK BIT(2)
110 #define SATAINTMASK_ERRCRTMSK BIT(1)
111 #define SATAINTMASK_ATAMSK BIT(0)
112
113 #define SATA_RCAR_INT_MASK (SATAINTMASK_SERRMSK | \
114 SATAINTMASK_ATAMSK)
115
116 /* Physical Layer Control Registers */
117 #define SATAPCTLR1_REG 0x43
118 #define SATAPCTLR2_REG 0x52
119 #define SATAPCTLR3_REG 0x5A
120 #define SATAPCTLR4_REG 0x60
121
122 /* Descriptor table word 0 bit (when DTA32M = 1) */
123 #define SATA_RCAR_DTEND BIT(0)
124
125 #define SATA_RCAR_DMA_BOUNDARY 0x1FFFFFFEUL
126
127 /* Gen2 Physical Layer Control Registers */
128 #define RCAR_GEN2_PHY_CTL1_REG 0x1704
129 #define RCAR_GEN2_PHY_CTL1 0x34180002
130 #define RCAR_GEN2_PHY_CTL1_SS 0xC180 /* Spread Spectrum */
131
132 #define RCAR_GEN2_PHY_CTL2_REG 0x170C
133 #define RCAR_GEN2_PHY_CTL2 0x00002303
134
135 #define RCAR_GEN2_PHY_CTL3_REG 0x171C
136 #define RCAR_GEN2_PHY_CTL3 0x000B0194
137
138 #define RCAR_GEN2_PHY_CTL4_REG 0x1724
139 #define RCAR_GEN2_PHY_CTL4 0x00030994
140
141 #define RCAR_GEN2_PHY_CTL5_REG 0x1740
142 #define RCAR_GEN2_PHY_CTL5 0x03004001
143 #define RCAR_GEN2_PHY_CTL5_DC BIT(1) /* DC connection */
144 #define RCAR_GEN2_PHY_CTL5_TR BIT(2) /* Termination Resistor */
145
146 enum sata_rcar_type {
147 RCAR_GEN1_SATA,
148 RCAR_GEN2_SATA,
149 };
150
151 struct sata_rcar_priv {
152 void __iomem *base;
153 struct clk *clk;
154 enum sata_rcar_type type;
155 };
156
157 static void sata_rcar_gen1_phy_preinit(struct sata_rcar_priv *priv)
158 {
159 void __iomem *base = priv->base;
160
161 /* idle state */
162 iowrite32(0, base + SATAPHYADDR_REG);
163 /* reset */
164 iowrite32(SATAPHYRESET_PHYRST, base + SATAPHYRESET_REG);
165 udelay(10);
166 /* deassert reset */
167 iowrite32(0, base + SATAPHYRESET_REG);
168 }
169
170 static void sata_rcar_gen1_phy_write(struct sata_rcar_priv *priv, u16 reg,
171 u32 val, int group)
172 {
173 void __iomem *base = priv->base;
174 int timeout;
175
176 /* deassert reset */
177 iowrite32(0, base + SATAPHYRESET_REG);
178 /* lane 1 */
179 iowrite32(SATAPHYACCEN_PHYLANE, base + SATAPHYACCEN_REG);
180 /* write phy register value */
181 iowrite32(val, base + SATAPHYWDATA_REG);
182 /* set register group */
183 if (group)
184 reg |= SATAPHYADDR_PHYRATEMODE;
185 /* write command */
186 iowrite32(SATAPHYADDR_PHYCMD_WRITE | reg, base + SATAPHYADDR_REG);
187 /* wait for ack */
188 for (timeout = 0; timeout < 100; timeout++) {
189 val = ioread32(base + SATAPHYACK_REG);
190 if (val & SATAPHYACK_PHYACK)
191 break;
192 }
193 if (timeout >= 100)
194 pr_err("%s timeout\n", __func__);
195 /* idle state */
196 iowrite32(0, base + SATAPHYADDR_REG);
197 }
198
199 static void sata_rcar_gen1_phy_init(struct sata_rcar_priv *priv)
200 {
201 sata_rcar_gen1_phy_preinit(priv);
202 sata_rcar_gen1_phy_write(priv, SATAPCTLR1_REG, 0x00200188, 0);
203 sata_rcar_gen1_phy_write(priv, SATAPCTLR1_REG, 0x00200188, 1);
204 sata_rcar_gen1_phy_write(priv, SATAPCTLR3_REG, 0x0000A061, 0);
205 sata_rcar_gen1_phy_write(priv, SATAPCTLR2_REG, 0x20000000, 0);
206 sata_rcar_gen1_phy_write(priv, SATAPCTLR2_REG, 0x20000000, 1);
207 sata_rcar_gen1_phy_write(priv, SATAPCTLR4_REG, 0x28E80000, 0);
208 }
209
210 static void sata_rcar_gen2_phy_init(struct sata_rcar_priv *priv)
211 {
212 void __iomem *base = priv->base;
213
214 iowrite32(RCAR_GEN2_PHY_CTL1, base + RCAR_GEN2_PHY_CTL1_REG);
215 iowrite32(RCAR_GEN2_PHY_CTL2, base + RCAR_GEN2_PHY_CTL2_REG);
216 iowrite32(RCAR_GEN2_PHY_CTL3, base + RCAR_GEN2_PHY_CTL3_REG);
217 iowrite32(RCAR_GEN2_PHY_CTL4, base + RCAR_GEN2_PHY_CTL4_REG);
218 iowrite32(RCAR_GEN2_PHY_CTL5 | RCAR_GEN2_PHY_CTL5_DC |
219 RCAR_GEN2_PHY_CTL5_TR, base + RCAR_GEN2_PHY_CTL5_REG);
220 }
221
222 static void sata_rcar_freeze(struct ata_port *ap)
223 {
224 struct sata_rcar_priv *priv = ap->host->private_data;
225
226 /* mask */
227 iowrite32(0x7ff, priv->base + SATAINTMASK_REG);
228
229 ata_sff_freeze(ap);
230 }
231
232 static void sata_rcar_thaw(struct ata_port *ap)
233 {
234 struct sata_rcar_priv *priv = ap->host->private_data;
235 void __iomem *base = priv->base;
236
237 /* ack */
238 iowrite32(~(u32)SATA_RCAR_INT_MASK, base + SATAINTSTAT_REG);
239
240 ata_sff_thaw(ap);
241
242 /* unmask */
243 iowrite32(0x7ff & ~SATA_RCAR_INT_MASK, base + SATAINTMASK_REG);
244 }
245
246 static void sata_rcar_ioread16_rep(void __iomem *reg, void *buffer, int count)
247 {
248 u16 *ptr = buffer;
249
250 while (count--) {
251 u16 data = ioread32(reg);
252
253 *ptr++ = data;
254 }
255 }
256
257 static void sata_rcar_iowrite16_rep(void __iomem *reg, void *buffer, int count)
258 {
259 const u16 *ptr = buffer;
260
261 while (count--)
262 iowrite32(*ptr++, reg);
263 }
264
265 static u8 sata_rcar_check_status(struct ata_port *ap)
266 {
267 return ioread32(ap->ioaddr.status_addr);
268 }
269
270 static u8 sata_rcar_check_altstatus(struct ata_port *ap)
271 {
272 return ioread32(ap->ioaddr.altstatus_addr);
273 }
274
275 static void sata_rcar_set_devctl(struct ata_port *ap, u8 ctl)
276 {
277 iowrite32(ctl, ap->ioaddr.ctl_addr);
278 }
279
280 static void sata_rcar_dev_select(struct ata_port *ap, unsigned int device)
281 {
282 iowrite32(ATA_DEVICE_OBS, ap->ioaddr.device_addr);
283 ata_sff_pause(ap); /* needed; also flushes, for mmio */
284 }
285
286 static unsigned int sata_rcar_ata_devchk(struct ata_port *ap,
287 unsigned int device)
288 {
289 struct ata_ioports *ioaddr = &ap->ioaddr;
290 u8 nsect, lbal;
291
292 sata_rcar_dev_select(ap, device);
293
294 iowrite32(0x55, ioaddr->nsect_addr);
295 iowrite32(0xaa, ioaddr->lbal_addr);
296
297 iowrite32(0xaa, ioaddr->nsect_addr);
298 iowrite32(0x55, ioaddr->lbal_addr);
299
300 iowrite32(0x55, ioaddr->nsect_addr);
301 iowrite32(0xaa, ioaddr->lbal_addr);
302
303 nsect = ioread32(ioaddr->nsect_addr);
304 lbal = ioread32(ioaddr->lbal_addr);
305
306 if (nsect == 0x55 && lbal == 0xaa)
307 return 1; /* found a device */
308
309 return 0; /* nothing found */
310 }
311
312 static int sata_rcar_wait_after_reset(struct ata_link *link,
313 unsigned long deadline)
314 {
315 struct ata_port *ap = link->ap;
316
317 ata_msleep(ap, ATA_WAIT_AFTER_RESET);
318
319 return ata_sff_wait_ready(link, deadline);
320 }
321
322 static int sata_rcar_bus_softreset(struct ata_port *ap, unsigned long deadline)
323 {
324 struct ata_ioports *ioaddr = &ap->ioaddr;
325
326 DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
327
328 /* software reset. causes dev0 to be selected */
329 iowrite32(ap->ctl, ioaddr->ctl_addr);
330 udelay(20);
331 iowrite32(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
332 udelay(20);
333 iowrite32(ap->ctl, ioaddr->ctl_addr);
334 ap->last_ctl = ap->ctl;
335
336 /* wait the port to become ready */
337 return sata_rcar_wait_after_reset(&ap->link, deadline);
338 }
339
340 static int sata_rcar_softreset(struct ata_link *link, unsigned int *classes,
341 unsigned long deadline)
342 {
343 struct ata_port *ap = link->ap;
344 unsigned int devmask = 0;
345 int rc;
346 u8 err;
347
348 /* determine if device 0 is present */
349 if (sata_rcar_ata_devchk(ap, 0))
350 devmask |= 1 << 0;
351
352 /* issue bus reset */
353 DPRINTK("about to softreset, devmask=%x\n", devmask);
354 rc = sata_rcar_bus_softreset(ap, deadline);
355 /* if link is occupied, -ENODEV too is an error */
356 if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
357 ata_link_err(link, "SRST failed (errno=%d)\n", rc);
358 return rc;
359 }
360
361 /* determine by signature whether we have ATA or ATAPI devices */
362 classes[0] = ata_sff_dev_classify(&link->device[0], devmask, &err);
363
364 DPRINTK("classes[0]=%u\n", classes[0]);
365 return 0;
366 }
367
368 static void sata_rcar_tf_load(struct ata_port *ap,
369 const struct ata_taskfile *tf)
370 {
371 struct ata_ioports *ioaddr = &ap->ioaddr;
372 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
373
374 if (tf->ctl != ap->last_ctl) {
375 iowrite32(tf->ctl, ioaddr->ctl_addr);
376 ap->last_ctl = tf->ctl;
377 ata_wait_idle(ap);
378 }
379
380 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
381 iowrite32(tf->hob_feature, ioaddr->feature_addr);
382 iowrite32(tf->hob_nsect, ioaddr->nsect_addr);
383 iowrite32(tf->hob_lbal, ioaddr->lbal_addr);
384 iowrite32(tf->hob_lbam, ioaddr->lbam_addr);
385 iowrite32(tf->hob_lbah, ioaddr->lbah_addr);
386 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
387 tf->hob_feature,
388 tf->hob_nsect,
389 tf->hob_lbal,
390 tf->hob_lbam,
391 tf->hob_lbah);
392 }
393
394 if (is_addr) {
395 iowrite32(tf->feature, ioaddr->feature_addr);
396 iowrite32(tf->nsect, ioaddr->nsect_addr);
397 iowrite32(tf->lbal, ioaddr->lbal_addr);
398 iowrite32(tf->lbam, ioaddr->lbam_addr);
399 iowrite32(tf->lbah, ioaddr->lbah_addr);
400 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
401 tf->feature,
402 tf->nsect,
403 tf->lbal,
404 tf->lbam,
405 tf->lbah);
406 }
407
408 if (tf->flags & ATA_TFLAG_DEVICE) {
409 iowrite32(tf->device, ioaddr->device_addr);
410 VPRINTK("device 0x%X\n", tf->device);
411 }
412
413 ata_wait_idle(ap);
414 }
415
416 static void sata_rcar_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
417 {
418 struct ata_ioports *ioaddr = &ap->ioaddr;
419
420 tf->command = sata_rcar_check_status(ap);
421 tf->feature = ioread32(ioaddr->error_addr);
422 tf->nsect = ioread32(ioaddr->nsect_addr);
423 tf->lbal = ioread32(ioaddr->lbal_addr);
424 tf->lbam = ioread32(ioaddr->lbam_addr);
425 tf->lbah = ioread32(ioaddr->lbah_addr);
426 tf->device = ioread32(ioaddr->device_addr);
427
428 if (tf->flags & ATA_TFLAG_LBA48) {
429 iowrite32(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
430 tf->hob_feature = ioread32(ioaddr->error_addr);
431 tf->hob_nsect = ioread32(ioaddr->nsect_addr);
432 tf->hob_lbal = ioread32(ioaddr->lbal_addr);
433 tf->hob_lbam = ioread32(ioaddr->lbam_addr);
434 tf->hob_lbah = ioread32(ioaddr->lbah_addr);
435 iowrite32(tf->ctl, ioaddr->ctl_addr);
436 ap->last_ctl = tf->ctl;
437 }
438 }
439
440 static void sata_rcar_exec_command(struct ata_port *ap,
441 const struct ata_taskfile *tf)
442 {
443 DPRINTK("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
444
445 iowrite32(tf->command, ap->ioaddr.command_addr);
446 ata_sff_pause(ap);
447 }
448
449 static unsigned int sata_rcar_data_xfer(struct ata_device *dev,
450 unsigned char *buf,
451 unsigned int buflen, int rw)
452 {
453 struct ata_port *ap = dev->link->ap;
454 void __iomem *data_addr = ap->ioaddr.data_addr;
455 unsigned int words = buflen >> 1;
456
457 /* Transfer multiple of 2 bytes */
458 if (rw == READ)
459 sata_rcar_ioread16_rep(data_addr, buf, words);
460 else
461 sata_rcar_iowrite16_rep(data_addr, buf, words);
462
463 /* Transfer trailing byte, if any. */
464 if (unlikely(buflen & 0x01)) {
465 unsigned char pad[2] = { };
466
467 /* Point buf to the tail of buffer */
468 buf += buflen - 1;
469
470 /*
471 * Use io*16_rep() accessors here as well to avoid pointlessly
472 * swapping bytes to and from on the big endian machines...
473 */
474 if (rw == READ) {
475 sata_rcar_ioread16_rep(data_addr, pad, 1);
476 *buf = pad[0];
477 } else {
478 pad[0] = *buf;
479 sata_rcar_iowrite16_rep(data_addr, pad, 1);
480 }
481 words++;
482 }
483
484 return words << 1;
485 }
486
487 static void sata_rcar_drain_fifo(struct ata_queued_cmd *qc)
488 {
489 int count;
490 struct ata_port *ap;
491
492 /* We only need to flush incoming data when a command was running */
493 if (qc == NULL || qc->dma_dir == DMA_TO_DEVICE)
494 return;
495
496 ap = qc->ap;
497 /* Drain up to 64K of data before we give up this recovery method */
498 for (count = 0; (ap->ops->sff_check_status(ap) & ATA_DRQ) &&
499 count < 65536; count += 2)
500 ioread32(ap->ioaddr.data_addr);
501
502 /* Can become DEBUG later */
503 if (count)
504 ata_port_dbg(ap, "drained %d bytes to clear DRQ\n", count);
505 }
506
507 static int sata_rcar_scr_read(struct ata_link *link, unsigned int sc_reg,
508 u32 *val)
509 {
510 if (sc_reg > SCR_ACTIVE)
511 return -EINVAL;
512
513 *val = ioread32(link->ap->ioaddr.scr_addr + (sc_reg << 2));
514 return 0;
515 }
516
517 static int sata_rcar_scr_write(struct ata_link *link, unsigned int sc_reg,
518 u32 val)
519 {
520 if (sc_reg > SCR_ACTIVE)
521 return -EINVAL;
522
523 iowrite32(val, link->ap->ioaddr.scr_addr + (sc_reg << 2));
524 return 0;
525 }
526
527 static void sata_rcar_bmdma_fill_sg(struct ata_queued_cmd *qc)
528 {
529 struct ata_port *ap = qc->ap;
530 struct ata_bmdma_prd *prd = ap->bmdma_prd;
531 struct scatterlist *sg;
532 unsigned int si;
533
534 for_each_sg(qc->sg, sg, qc->n_elem, si) {
535 u32 addr, sg_len;
536
537 /*
538 * Note: h/w doesn't support 64-bit, so we unconditionally
539 * truncate dma_addr_t to u32.
540 */
541 addr = (u32)sg_dma_address(sg);
542 sg_len = sg_dma_len(sg);
543
544 prd[si].addr = cpu_to_le32(addr);
545 prd[si].flags_len = cpu_to_le32(sg_len);
546 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", si, addr, sg_len);
547 }
548
549 /* end-of-table flag */
550 prd[si - 1].addr |= cpu_to_le32(SATA_RCAR_DTEND);
551 }
552
553 static void sata_rcar_qc_prep(struct ata_queued_cmd *qc)
554 {
555 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
556 return;
557
558 sata_rcar_bmdma_fill_sg(qc);
559 }
560
561 static void sata_rcar_bmdma_setup(struct ata_queued_cmd *qc)
562 {
563 struct ata_port *ap = qc->ap;
564 unsigned int rw = qc->tf.flags & ATA_TFLAG_WRITE;
565 struct sata_rcar_priv *priv = ap->host->private_data;
566 void __iomem *base = priv->base;
567 u32 dmactl;
568
569 /* load PRD table addr. */
570 mb(); /* make sure PRD table writes are visible to controller */
571 iowrite32(ap->bmdma_prd_dma, base + ATAPI_DTB_ADR_REG);
572
573 /* specify data direction, triple-check start bit is clear */
574 dmactl = ioread32(base + ATAPI_CONTROL1_REG);
575 dmactl &= ~(ATAPI_CONTROL1_RW | ATAPI_CONTROL1_STOP);
576 if (dmactl & ATAPI_CONTROL1_START) {
577 dmactl &= ~ATAPI_CONTROL1_START;
578 dmactl |= ATAPI_CONTROL1_STOP;
579 }
580 if (!rw)
581 dmactl |= ATAPI_CONTROL1_RW;
582 iowrite32(dmactl, base + ATAPI_CONTROL1_REG);
583
584 /* issue r/w command */
585 ap->ops->sff_exec_command(ap, &qc->tf);
586 }
587
588 static void sata_rcar_bmdma_start(struct ata_queued_cmd *qc)
589 {
590 struct ata_port *ap = qc->ap;
591 struct sata_rcar_priv *priv = ap->host->private_data;
592 void __iomem *base = priv->base;
593 u32 dmactl;
594
595 /* start host DMA transaction */
596 dmactl = ioread32(base + ATAPI_CONTROL1_REG);
597 dmactl &= ~ATAPI_CONTROL1_STOP;
598 dmactl |= ATAPI_CONTROL1_START;
599 iowrite32(dmactl, base + ATAPI_CONTROL1_REG);
600 }
601
602 static void sata_rcar_bmdma_stop(struct ata_queued_cmd *qc)
603 {
604 struct ata_port *ap = qc->ap;
605 struct sata_rcar_priv *priv = ap->host->private_data;
606 void __iomem *base = priv->base;
607 u32 dmactl;
608
609 /* force termination of DMA transfer if active */
610 dmactl = ioread32(base + ATAPI_CONTROL1_REG);
611 if (dmactl & ATAPI_CONTROL1_START) {
612 dmactl &= ~ATAPI_CONTROL1_START;
613 dmactl |= ATAPI_CONTROL1_STOP;
614 iowrite32(dmactl, base + ATAPI_CONTROL1_REG);
615 }
616
617 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
618 ata_sff_dma_pause(ap);
619 }
620
621 static u8 sata_rcar_bmdma_status(struct ata_port *ap)
622 {
623 struct sata_rcar_priv *priv = ap->host->private_data;
624 u8 host_stat = 0;
625 u32 status;
626
627 status = ioread32(priv->base + ATAPI_STATUS_REG);
628 if (status & ATAPI_STATUS_DEVINT)
629 host_stat |= ATA_DMA_INTR;
630 if (status & ATAPI_STATUS_ACT)
631 host_stat |= ATA_DMA_ACTIVE;
632
633 return host_stat;
634 }
635
636 static struct scsi_host_template sata_rcar_sht = {
637 ATA_BASE_SHT(DRV_NAME),
638 /*
639 * This controller allows transfer chunks up to 512MB which cross 64KB
640 * boundaries, therefore the DMA limits are more relaxed than standard
641 * ATA SFF.
642 */
643 .sg_tablesize = ATA_MAX_PRD,
644 .dma_boundary = SATA_RCAR_DMA_BOUNDARY,
645 };
646
647 static struct ata_port_operations sata_rcar_port_ops = {
648 .inherits = &ata_bmdma_port_ops,
649
650 .freeze = sata_rcar_freeze,
651 .thaw = sata_rcar_thaw,
652 .softreset = sata_rcar_softreset,
653
654 .scr_read = sata_rcar_scr_read,
655 .scr_write = sata_rcar_scr_write,
656
657 .sff_dev_select = sata_rcar_dev_select,
658 .sff_set_devctl = sata_rcar_set_devctl,
659 .sff_check_status = sata_rcar_check_status,
660 .sff_check_altstatus = sata_rcar_check_altstatus,
661 .sff_tf_load = sata_rcar_tf_load,
662 .sff_tf_read = sata_rcar_tf_read,
663 .sff_exec_command = sata_rcar_exec_command,
664 .sff_data_xfer = sata_rcar_data_xfer,
665 .sff_drain_fifo = sata_rcar_drain_fifo,
666
667 .qc_prep = sata_rcar_qc_prep,
668
669 .bmdma_setup = sata_rcar_bmdma_setup,
670 .bmdma_start = sata_rcar_bmdma_start,
671 .bmdma_stop = sata_rcar_bmdma_stop,
672 .bmdma_status = sata_rcar_bmdma_status,
673 };
674
675 static void sata_rcar_serr_interrupt(struct ata_port *ap)
676 {
677 struct sata_rcar_priv *priv = ap->host->private_data;
678 struct ata_eh_info *ehi = &ap->link.eh_info;
679 int freeze = 0;
680 u32 serror;
681
682 serror = ioread32(priv->base + SCRSERR_REG);
683 if (!serror)
684 return;
685
686 DPRINTK("SError @host_intr: 0x%x\n", serror);
687
688 /* first, analyze and record host port events */
689 ata_ehi_clear_desc(ehi);
690
691 if (serror & (SERR_DEV_XCHG | SERR_PHYRDY_CHG)) {
692 /* Setup a soft-reset EH action */
693 ata_ehi_hotplugged(ehi);
694 ata_ehi_push_desc(ehi, "%s", "hotplug");
695
696 freeze = serror & SERR_COMM_WAKE ? 0 : 1;
697 }
698
699 /* freeze or abort */
700 if (freeze)
701 ata_port_freeze(ap);
702 else
703 ata_port_abort(ap);
704 }
705
706 static void sata_rcar_ata_interrupt(struct ata_port *ap)
707 {
708 struct ata_queued_cmd *qc;
709 int handled = 0;
710
711 qc = ata_qc_from_tag(ap, ap->link.active_tag);
712 if (qc)
713 handled |= ata_bmdma_port_intr(ap, qc);
714
715 /* be sure to clear ATA interrupt */
716 if (!handled)
717 sata_rcar_check_status(ap);
718 }
719
720 static irqreturn_t sata_rcar_interrupt(int irq, void *dev_instance)
721 {
722 struct ata_host *host = dev_instance;
723 struct sata_rcar_priv *priv = host->private_data;
724 void __iomem *base = priv->base;
725 unsigned int handled = 0;
726 struct ata_port *ap;
727 u32 sataintstat;
728 unsigned long flags;
729
730 spin_lock_irqsave(&host->lock, flags);
731
732 sataintstat = ioread32(base + SATAINTSTAT_REG);
733 sataintstat &= SATA_RCAR_INT_MASK;
734 if (!sataintstat)
735 goto done;
736 /* ack */
737 iowrite32(~sataintstat & 0x7ff, base + SATAINTSTAT_REG);
738
739 ap = host->ports[0];
740
741 if (sataintstat & SATAINTSTAT_ATA)
742 sata_rcar_ata_interrupt(ap);
743
744 if (sataintstat & SATAINTSTAT_SERR)
745 sata_rcar_serr_interrupt(ap);
746
747 handled = 1;
748 done:
749 spin_unlock_irqrestore(&host->lock, flags);
750
751 return IRQ_RETVAL(handled);
752 }
753
754 static void sata_rcar_setup_port(struct ata_host *host)
755 {
756 struct ata_port *ap = host->ports[0];
757 struct ata_ioports *ioaddr = &ap->ioaddr;
758 struct sata_rcar_priv *priv = host->private_data;
759 void __iomem *base = priv->base;
760
761 ap->ops = &sata_rcar_port_ops;
762 ap->pio_mask = ATA_PIO4;
763 ap->udma_mask = ATA_UDMA6;
764 ap->flags |= ATA_FLAG_SATA;
765
766 ioaddr->cmd_addr = base + SDATA_REG;
767 ioaddr->ctl_addr = base + SSDEVCON_REG;
768 ioaddr->scr_addr = base + SCRSSTS_REG;
769 ioaddr->altstatus_addr = ioaddr->ctl_addr;
770
771 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
772 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
773 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
774 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
775 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
776 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
777 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
778 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
779 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
780 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
781 }
782
783 static void sata_rcar_init_controller(struct ata_host *host)
784 {
785 struct sata_rcar_priv *priv = host->private_data;
786 void __iomem *base = priv->base;
787 u32 val;
788
789 /* reset and setup phy */
790 switch (priv->type) {
791 case RCAR_GEN1_SATA:
792 sata_rcar_gen1_phy_init(priv);
793 break;
794 case RCAR_GEN2_SATA:
795 sata_rcar_gen2_phy_init(priv);
796 break;
797 default:
798 dev_warn(host->dev, "SATA phy is not initialized\n");
799 break;
800 }
801
802 /* SATA-IP reset state */
803 val = ioread32(base + ATAPI_CONTROL1_REG);
804 val |= ATAPI_CONTROL1_RESET;
805 iowrite32(val, base + ATAPI_CONTROL1_REG);
806
807 /* ISM mode, PRD mode, DTEND flag at bit 0 */
808 val = ioread32(base + ATAPI_CONTROL1_REG);
809 val |= ATAPI_CONTROL1_ISM;
810 val |= ATAPI_CONTROL1_DESE;
811 val |= ATAPI_CONTROL1_DTA32M;
812 iowrite32(val, base + ATAPI_CONTROL1_REG);
813
814 /* Release the SATA-IP from the reset state */
815 val = ioread32(base + ATAPI_CONTROL1_REG);
816 val &= ~ATAPI_CONTROL1_RESET;
817 iowrite32(val, base + ATAPI_CONTROL1_REG);
818
819 /* ack and mask */
820 iowrite32(0, base + SATAINTSTAT_REG);
821 iowrite32(0x7ff, base + SATAINTMASK_REG);
822 /* enable interrupts */
823 iowrite32(ATAPI_INT_ENABLE_SATAINT, base + ATAPI_INT_ENABLE_REG);
824 }
825
826 static struct of_device_id sata_rcar_match[] = {
827 {
828 /* Deprecated by "renesas,sata-r8a7779" */
829 .compatible = "renesas,rcar-sata",
830 .data = (void *)RCAR_GEN1_SATA,
831 },
832 {
833 .compatible = "renesas,sata-r8a7779",
834 .data = (void *)RCAR_GEN1_SATA,
835 },
836 {
837 .compatible = "renesas,sata-r8a7790",
838 .data = (void *)RCAR_GEN2_SATA
839 },
840 {
841 .compatible = "renesas,sata-r8a7791",
842 .data = (void *)RCAR_GEN2_SATA
843 },
844 { },
845 };
846 MODULE_DEVICE_TABLE(of, sata_rcar_match);
847
848 static const struct platform_device_id sata_rcar_id_table[] = {
849 { "sata_rcar", RCAR_GEN1_SATA }, /* Deprecated by "sata-r8a7779" */
850 { "sata-r8a7779", RCAR_GEN1_SATA },
851 { "sata-r8a7790", RCAR_GEN2_SATA },
852 { "sata-r8a7791", RCAR_GEN2_SATA },
853 { },
854 };
855 MODULE_DEVICE_TABLE(platform, sata_rcar_id_table);
856
857 static int sata_rcar_probe(struct platform_device *pdev)
858 {
859 const struct of_device_id *of_id;
860 struct ata_host *host;
861 struct sata_rcar_priv *priv;
862 struct resource *mem;
863 int irq;
864 int ret = 0;
865
866 irq = platform_get_irq(pdev, 0);
867 if (irq <= 0)
868 return -EINVAL;
869
870 priv = devm_kzalloc(&pdev->dev, sizeof(struct sata_rcar_priv),
871 GFP_KERNEL);
872 if (!priv)
873 return -ENOMEM;
874
875 of_id = of_match_device(sata_rcar_match, &pdev->dev);
876 if (of_id)
877 priv->type = (enum sata_rcar_type)of_id->data;
878 else
879 priv->type = platform_get_device_id(pdev)->driver_data;
880
881 priv->clk = devm_clk_get(&pdev->dev, NULL);
882 if (IS_ERR(priv->clk)) {
883 dev_err(&pdev->dev, "failed to get access to sata clock\n");
884 return PTR_ERR(priv->clk);
885 }
886 clk_prepare_enable(priv->clk);
887
888 host = ata_host_alloc(&pdev->dev, 1);
889 if (!host) {
890 dev_err(&pdev->dev, "ata_host_alloc failed\n");
891 ret = -ENOMEM;
892 goto cleanup;
893 }
894
895 host->private_data = priv;
896
897 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
898 priv->base = devm_ioremap_resource(&pdev->dev, mem);
899 if (IS_ERR(priv->base)) {
900 ret = PTR_ERR(priv->base);
901 goto cleanup;
902 }
903
904 /* setup port */
905 sata_rcar_setup_port(host);
906
907 /* initialize host controller */
908 sata_rcar_init_controller(host);
909
910 ret = ata_host_activate(host, irq, sata_rcar_interrupt, 0,
911 &sata_rcar_sht);
912 if (!ret)
913 return 0;
914
915 cleanup:
916 clk_disable_unprepare(priv->clk);
917
918 return ret;
919 }
920
921 static int sata_rcar_remove(struct platform_device *pdev)
922 {
923 struct ata_host *host = platform_get_drvdata(pdev);
924 struct sata_rcar_priv *priv = host->private_data;
925 void __iomem *base = priv->base;
926
927 ata_host_detach(host);
928
929 /* disable interrupts */
930 iowrite32(0, base + ATAPI_INT_ENABLE_REG);
931 /* ack and mask */
932 iowrite32(0, base + SATAINTSTAT_REG);
933 iowrite32(0x7ff, base + SATAINTMASK_REG);
934
935 clk_disable_unprepare(priv->clk);
936
937 return 0;
938 }
939
940 #ifdef CONFIG_PM
941 static int sata_rcar_suspend(struct device *dev)
942 {
943 struct ata_host *host = dev_get_drvdata(dev);
944 struct sata_rcar_priv *priv = host->private_data;
945 void __iomem *base = priv->base;
946 int ret;
947
948 ret = ata_host_suspend(host, PMSG_SUSPEND);
949 if (!ret) {
950 /* disable interrupts */
951 iowrite32(0, base + ATAPI_INT_ENABLE_REG);
952 /* mask */
953 iowrite32(0x7ff, base + SATAINTMASK_REG);
954
955 clk_disable_unprepare(priv->clk);
956 }
957
958 return ret;
959 }
960
961 static int sata_rcar_resume(struct device *dev)
962 {
963 struct ata_host *host = dev_get_drvdata(dev);
964 struct sata_rcar_priv *priv = host->private_data;
965 void __iomem *base = priv->base;
966
967 clk_prepare_enable(priv->clk);
968
969 /* ack and mask */
970 iowrite32(0, base + SATAINTSTAT_REG);
971 iowrite32(0x7ff, base + SATAINTMASK_REG);
972 /* enable interrupts */
973 iowrite32(ATAPI_INT_ENABLE_SATAINT, base + ATAPI_INT_ENABLE_REG);
974
975 ata_host_resume(host);
976
977 return 0;
978 }
979
980 static const struct dev_pm_ops sata_rcar_pm_ops = {
981 .suspend = sata_rcar_suspend,
982 .resume = sata_rcar_resume,
983 };
984 #endif
985
986 static struct platform_driver sata_rcar_driver = {
987 .probe = sata_rcar_probe,
988 .remove = sata_rcar_remove,
989 .id_table = sata_rcar_id_table,
990 .driver = {
991 .name = DRV_NAME,
992 .owner = THIS_MODULE,
993 .of_match_table = sata_rcar_match,
994 #ifdef CONFIG_PM
995 .pm = &sata_rcar_pm_ops,
996 #endif
997 },
998 };
999
1000 module_platform_driver(sata_rcar_driver);
1001
1002 MODULE_LICENSE("GPL");
1003 MODULE_AUTHOR("Vladimir Barinov");
1004 MODULE_DESCRIPTION("Renesas R-Car SATA controller low level driver");
Linux with added FPC-III support