1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Renesas R-Car SATA driver
4 *
5 * Author: Vladimir Barinov <source@cogentembedded.com>
6 * Copyright (C) 2013-2015 Cogent Embedded, Inc.
7 * Copyright (C) 2013-2015 Renesas Solutions Corp.
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/ata.h>
13 #include <linux/libata.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/err.h>
18
19 #define DRV_NAME "sata_rcar"
20
21 /* SH-Navi2G/ATAPI module compatible control registers */
22 #define ATAPI_CONTROL1_REG 0x180
23 #define ATAPI_STATUS_REG 0x184
24 #define ATAPI_INT_ENABLE_REG 0x188
25 #define ATAPI_DTB_ADR_REG 0x198
26 #define ATAPI_DMA_START_ADR_REG 0x19C
27 #define ATAPI_DMA_TRANS_CNT_REG 0x1A0
28 #define ATAPI_CONTROL2_REG 0x1A4
29 #define ATAPI_SIG_ST_REG 0x1B0
30 #define ATAPI_BYTE_SWAP_REG 0x1BC
31
32 /* ATAPI control 1 register (ATAPI_CONTROL1) bits */
33 #define ATAPI_CONTROL1_ISM BIT(16)
34 #define ATAPI_CONTROL1_DTA32M BIT(11)
35 #define ATAPI_CONTROL1_RESET BIT(7)
36 #define ATAPI_CONTROL1_DESE BIT(3)
37 #define ATAPI_CONTROL1_RW BIT(2)
38 #define ATAPI_CONTROL1_STOP BIT(1)
39 #define ATAPI_CONTROL1_START BIT(0)
40
41 /* ATAPI status register (ATAPI_STATUS) bits */
42 #define ATAPI_STATUS_SATAINT BIT(11)
43 #define ATAPI_STATUS_DNEND BIT(6)
44 #define ATAPI_STATUS_DEVTRM BIT(5)
45 #define ATAPI_STATUS_DEVINT BIT(4)
46 #define ATAPI_STATUS_ERR BIT(2)
47 #define ATAPI_STATUS_NEND BIT(1)
48 #define ATAPI_STATUS_ACT BIT(0)
49
50 /* Interrupt enable register (ATAPI_INT_ENABLE) bits */
51 #define ATAPI_INT_ENABLE_SATAINT BIT(11)
52 #define ATAPI_INT_ENABLE_DNEND BIT(6)
53 #define ATAPI_INT_ENABLE_DEVTRM BIT(5)
54 #define ATAPI_INT_ENABLE_DEVINT BIT(4)
55 #define ATAPI_INT_ENABLE_ERR BIT(2)
56 #define ATAPI_INT_ENABLE_NEND BIT(1)
57 #define ATAPI_INT_ENABLE_ACT BIT(0)
58
59 /* Access control registers for physical layer control register */
60 #define SATAPHYADDR_REG 0x200
61 #define SATAPHYWDATA_REG 0x204
62 #define SATAPHYACCEN_REG 0x208
63 #define SATAPHYRESET_REG 0x20C
64 #define SATAPHYRDATA_REG 0x210
65 #define SATAPHYACK_REG 0x214
66
67 /* Physical layer control address command register (SATAPHYADDR) bits */
68 #define SATAPHYADDR_PHYRATEMODE BIT(10)
69 #define SATAPHYADDR_PHYCMD_READ BIT(9)
70 #define SATAPHYADDR_PHYCMD_WRITE BIT(8)
71
72 /* Physical layer control enable register (SATAPHYACCEN) bits */
73 #define SATAPHYACCEN_PHYLANE BIT(0)
74
75 /* Physical layer control reset register (SATAPHYRESET) bits */
76 #define SATAPHYRESET_PHYRST BIT(1)
77 #define SATAPHYRESET_PHYSRES BIT(0)
78
79 /* Physical layer control acknowledge register (SATAPHYACK) bits */
80 #define SATAPHYACK_PHYACK BIT(0)
81
82 /* Serial-ATA HOST control registers */
83 #define BISTCONF_REG 0x102C
84 #define SDATA_REG 0x1100
85 #define SSDEVCON_REG 0x1204
86
87 #define SCRSSTS_REG 0x1400
88 #define SCRSERR_REG 0x1404
89 #define SCRSCON_REG 0x1408
90 #define SCRSACT_REG 0x140C
91
92 #define SATAINTSTAT_REG 0x1508
93 #define SATAINTMASK_REG 0x150C
94
95 /* SATA INT status register (SATAINTSTAT) bits */
96 #define SATAINTSTAT_SERR BIT(3)
97 #define SATAINTSTAT_ATA BIT(0)
98
99 /* SATA INT mask register (SATAINTSTAT) bits */
100 #define SATAINTMASK_SERRMSK BIT(3)
101 #define SATAINTMASK_ERRMSK BIT(2)
102 #define SATAINTMASK_ERRCRTMSK BIT(1)
103 #define SATAINTMASK_ATAMSK BIT(0)
104 #define SATAINTMASK_ALL_GEN1 0x7ff
105 #define SATAINTMASK_ALL_GEN2 0xfff
106
107 #define SATA_RCAR_INT_MASK (SATAINTMASK_SERRMSK | \
108 SATAINTMASK_ATAMSK)
109
110 /* Physical Layer Control Registers */
111 #define SATAPCTLR1_REG 0x43
112 #define SATAPCTLR2_REG 0x52
113 #define SATAPCTLR3_REG 0x5A
114 #define SATAPCTLR4_REG 0x60
115
116 /* Descriptor table word 0 bit (when DTA32M = 1) */
117 #define SATA_RCAR_DTEND BIT(0)
118
119 #define SATA_RCAR_DMA_BOUNDARY 0x1FFFFFFFUL
120
121 /* Gen2 Physical Layer Control Registers */
122 #define RCAR_GEN2_PHY_CTL1_REG 0x1704
123 #define RCAR_GEN2_PHY_CTL1 0x34180002
124 #define RCAR_GEN2_PHY_CTL1_SS 0xC180 /* Spread Spectrum */
125
126 #define RCAR_GEN2_PHY_CTL2_REG 0x170C
127 #define RCAR_GEN2_PHY_CTL2 0x00002303
128
129 #define RCAR_GEN2_PHY_CTL3_REG 0x171C
130 #define RCAR_GEN2_PHY_CTL3 0x000B0194
131
132 #define RCAR_GEN2_PHY_CTL4_REG 0x1724
133 #define RCAR_GEN2_PHY_CTL4 0x00030994
134
135 #define RCAR_GEN2_PHY_CTL5_REG 0x1740
136 #define RCAR_GEN2_PHY_CTL5 0x03004001
137 #define RCAR_GEN2_PHY_CTL5_DC BIT(1) /* DC connection */
138 #define RCAR_GEN2_PHY_CTL5_TR BIT(2) /* Termination Resistor */
139
140 enum sata_rcar_type {
141 RCAR_GEN1_SATA,
142 RCAR_GEN2_SATA,
143 RCAR_GEN3_SATA,
144 RCAR_R8A7790_ES1_SATA,
145 };
146
147 struct sata_rcar_priv {
148 void __iomem *base;
149 u32 sataint_mask;
150 enum sata_rcar_type type;
151 };
152
sata_rcar_gen1_phy_preinit(struct sata_rcar_priv * priv)153 static void sata_rcar_gen1_phy_preinit(struct sata_rcar_priv *priv)
154 {
155 void __iomem *base = priv->base;
156
157 /* idle state */
158 iowrite32(0, base + SATAPHYADDR_REG);
159 /* reset */
160 iowrite32(SATAPHYRESET_PHYRST, base + SATAPHYRESET_REG);
161 udelay(10);
162 /* deassert reset */
163 iowrite32(0, base + SATAPHYRESET_REG);
164 }
165
sata_rcar_gen1_phy_write(struct sata_rcar_priv * priv,u16 reg,u32 val,int group)166 static void sata_rcar_gen1_phy_write(struct sata_rcar_priv *priv, u16 reg,
167 u32 val, int group)
168 {
169 void __iomem *base = priv->base;
170 int timeout;
171
172 /* deassert reset */
173 iowrite32(0, base + SATAPHYRESET_REG);
174 /* lane 1 */
175 iowrite32(SATAPHYACCEN_PHYLANE, base + SATAPHYACCEN_REG);
176 /* write phy register value */
177 iowrite32(val, base + SATAPHYWDATA_REG);
178 /* set register group */
179 if (group)
180 reg |= SATAPHYADDR_PHYRATEMODE;
181 /* write command */
182 iowrite32(SATAPHYADDR_PHYCMD_WRITE | reg, base + SATAPHYADDR_REG);
183 /* wait for ack */
184 for (timeout = 0; timeout < 100; timeout++) {
185 val = ioread32(base + SATAPHYACK_REG);
186 if (val & SATAPHYACK_PHYACK)
187 break;
188 }
189 if (timeout >= 100)
190 pr_err("%s timeout\n", __func__);
191 /* idle state */
192 iowrite32(0, base + SATAPHYADDR_REG);
193 }
194
sata_rcar_gen1_phy_init(struct sata_rcar_priv * priv)195 static void sata_rcar_gen1_phy_init(struct sata_rcar_priv *priv)
196 {
197 sata_rcar_gen1_phy_preinit(priv);
198 sata_rcar_gen1_phy_write(priv, SATAPCTLR1_REG, 0x00200188, 0);
199 sata_rcar_gen1_phy_write(priv, SATAPCTLR1_REG, 0x00200188, 1);
200 sata_rcar_gen1_phy_write(priv, SATAPCTLR3_REG, 0x0000A061, 0);
201 sata_rcar_gen1_phy_write(priv, SATAPCTLR2_REG, 0x20000000, 0);
202 sata_rcar_gen1_phy_write(priv, SATAPCTLR2_REG, 0x20000000, 1);
203 sata_rcar_gen1_phy_write(priv, SATAPCTLR4_REG, 0x28E80000, 0);
204 }
205
sata_rcar_gen2_phy_init(struct sata_rcar_priv * priv)206 static void sata_rcar_gen2_phy_init(struct sata_rcar_priv *priv)
207 {
208 void __iomem *base = priv->base;
209
210 iowrite32(RCAR_GEN2_PHY_CTL1, base + RCAR_GEN2_PHY_CTL1_REG);
211 iowrite32(RCAR_GEN2_PHY_CTL2, base + RCAR_GEN2_PHY_CTL2_REG);
212 iowrite32(RCAR_GEN2_PHY_CTL3, base + RCAR_GEN2_PHY_CTL3_REG);
213 iowrite32(RCAR_GEN2_PHY_CTL4, base + RCAR_GEN2_PHY_CTL4_REG);
214 iowrite32(RCAR_GEN2_PHY_CTL5 | RCAR_GEN2_PHY_CTL5_DC |
215 RCAR_GEN2_PHY_CTL5_TR, base + RCAR_GEN2_PHY_CTL5_REG);
216 }
217
sata_rcar_freeze(struct ata_port * ap)218 static void sata_rcar_freeze(struct ata_port *ap)
219 {
220 struct sata_rcar_priv *priv = ap->host->private_data;
221
222 /* mask */
223 iowrite32(priv->sataint_mask, priv->base + SATAINTMASK_REG);
224
225 ata_sff_freeze(ap);
226 }
227
sata_rcar_thaw(struct ata_port * ap)228 static void sata_rcar_thaw(struct ata_port *ap)
229 {
230 struct sata_rcar_priv *priv = ap->host->private_data;
231 void __iomem *base = priv->base;
232
233 /* ack */
234 iowrite32(~(u32)SATA_RCAR_INT_MASK, base + SATAINTSTAT_REG);
235
236 ata_sff_thaw(ap);
237
238 /* unmask */
239 iowrite32(priv->sataint_mask & ~SATA_RCAR_INT_MASK, base + SATAINTMASK_REG);
240 }
241
sata_rcar_ioread16_rep(void __iomem * reg,void * buffer,int count)242 static void sata_rcar_ioread16_rep(void __iomem *reg, void *buffer, int count)
243 {
244 u16 *ptr = buffer;
245
246 while (count--) {
247 u16 data = ioread32(reg);
248
249 *ptr++ = data;
250 }
251 }
252
sata_rcar_iowrite16_rep(void __iomem * reg,void * buffer,int count)253 static void sata_rcar_iowrite16_rep(void __iomem *reg, void *buffer, int count)
254 {
255 const u16 *ptr = buffer;
256
257 while (count--)
258 iowrite32(*ptr++, reg);
259 }
260
sata_rcar_check_status(struct ata_port * ap)261 static u8 sata_rcar_check_status(struct ata_port *ap)
262 {
263 return ioread32(ap->ioaddr.status_addr);
264 }
265
sata_rcar_check_altstatus(struct ata_port * ap)266 static u8 sata_rcar_check_altstatus(struct ata_port *ap)
267 {
268 return ioread32(ap->ioaddr.altstatus_addr);
269 }
270
sata_rcar_set_devctl(struct ata_port * ap,u8 ctl)271 static void sata_rcar_set_devctl(struct ata_port *ap, u8 ctl)
272 {
273 iowrite32(ctl, ap->ioaddr.ctl_addr);
274 }
275
sata_rcar_dev_select(struct ata_port * ap,unsigned int device)276 static void sata_rcar_dev_select(struct ata_port *ap, unsigned int device)
277 {
278 iowrite32(ATA_DEVICE_OBS, ap->ioaddr.device_addr);
279 ata_sff_pause(ap); /* needed; also flushes, for mmio */
280 }
281
sata_rcar_ata_devchk(struct ata_port * ap,unsigned int device)282 static bool sata_rcar_ata_devchk(struct ata_port *ap, unsigned int device)
283 {
284 struct ata_ioports *ioaddr = &ap->ioaddr;
285 u8 nsect, lbal;
286
287 sata_rcar_dev_select(ap, device);
288
289 iowrite32(0x55, ioaddr->nsect_addr);
290 iowrite32(0xaa, ioaddr->lbal_addr);
291
292 iowrite32(0xaa, ioaddr->nsect_addr);
293 iowrite32(0x55, ioaddr->lbal_addr);
294
295 iowrite32(0x55, ioaddr->nsect_addr);
296 iowrite32(0xaa, ioaddr->lbal_addr);
297
298 nsect = ioread32(ioaddr->nsect_addr);
299 lbal = ioread32(ioaddr->lbal_addr);
300
301 if (nsect == 0x55 && lbal == 0xaa)
302 return true; /* found a device */
303
304 return false; /* nothing found */
305 }
306
sata_rcar_wait_after_reset(struct ata_link * link,unsigned long deadline)307 static int sata_rcar_wait_after_reset(struct ata_link *link,
308 unsigned long deadline)
309 {
310 struct ata_port *ap = link->ap;
311
312 ata_msleep(ap, ATA_WAIT_AFTER_RESET);
313
314 return ata_sff_wait_ready(link, deadline);
315 }
316
sata_rcar_bus_softreset(struct ata_port * ap,unsigned long deadline)317 static int sata_rcar_bus_softreset(struct ata_port *ap, unsigned long deadline)
318 {
319 struct ata_ioports *ioaddr = &ap->ioaddr;
320
321 /* software reset. causes dev0 to be selected */
322 iowrite32(ap->ctl, ioaddr->ctl_addr);
323 udelay(20);
324 iowrite32(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
325 udelay(20);
326 iowrite32(ap->ctl, ioaddr->ctl_addr);
327 ap->last_ctl = ap->ctl;
328
329 /* wait the port to become ready */
330 return sata_rcar_wait_after_reset(&ap->link, deadline);
331 }
332
sata_rcar_softreset(struct ata_link * link,unsigned int * classes,unsigned long deadline)333 static int sata_rcar_softreset(struct ata_link *link, unsigned int *classes,
334 unsigned long deadline)
335 {
336 struct ata_port *ap = link->ap;
337 unsigned int devmask = 0;
338 int rc;
339 u8 err;
340
341 /* determine if device 0 is present */
342 if (sata_rcar_ata_devchk(ap, 0))
343 devmask |= 1 << 0;
344
345 /* issue bus reset */
346 rc = sata_rcar_bus_softreset(ap, deadline);
347 /* if link is occupied, -ENODEV too is an error */
348 if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
349 ata_link_err(link, "SRST failed (errno=%d)\n", rc);
350 return rc;
351 }
352
353 /* determine by signature whether we have ATA or ATAPI devices */
354 classes[0] = ata_sff_dev_classify(&link->device[0], devmask, &err);
355
356 return 0;
357 }
358
sata_rcar_tf_load(struct ata_port * ap,const struct ata_taskfile * tf)359 static void sata_rcar_tf_load(struct ata_port *ap,
360 const struct ata_taskfile *tf)
361 {
362 struct ata_ioports *ioaddr = &ap->ioaddr;
363 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
364
365 if (tf->ctl != ap->last_ctl) {
366 iowrite32(tf->ctl, ioaddr->ctl_addr);
367 ap->last_ctl = tf->ctl;
368 ata_wait_idle(ap);
369 }
370
371 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
372 iowrite32(tf->hob_feature, ioaddr->feature_addr);
373 iowrite32(tf->hob_nsect, ioaddr->nsect_addr);
374 iowrite32(tf->hob_lbal, ioaddr->lbal_addr);
375 iowrite32(tf->hob_lbam, ioaddr->lbam_addr);
376 iowrite32(tf->hob_lbah, ioaddr->lbah_addr);
377 }
378
379 if (is_addr) {
380 iowrite32(tf->feature, ioaddr->feature_addr);
381 iowrite32(tf->nsect, ioaddr->nsect_addr);
382 iowrite32(tf->lbal, ioaddr->lbal_addr);
383 iowrite32(tf->lbam, ioaddr->lbam_addr);
384 iowrite32(tf->lbah, ioaddr->lbah_addr);
385 }
386
387 if (tf->flags & ATA_TFLAG_DEVICE)
388 iowrite32(tf->device, ioaddr->device_addr);
389
390 ata_wait_idle(ap);
391 }
392
sata_rcar_tf_read(struct ata_port * ap,struct ata_taskfile * tf)393 static void sata_rcar_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
394 {
395 struct ata_ioports *ioaddr = &ap->ioaddr;
396
397 tf->status = sata_rcar_check_status(ap);
398 tf->error = ioread32(ioaddr->error_addr);
399 tf->nsect = ioread32(ioaddr->nsect_addr);
400 tf->lbal = ioread32(ioaddr->lbal_addr);
401 tf->lbam = ioread32(ioaddr->lbam_addr);
402 tf->lbah = ioread32(ioaddr->lbah_addr);
403 tf->device = ioread32(ioaddr->device_addr);
404
405 if (tf->flags & ATA_TFLAG_LBA48) {
406 iowrite32(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
407 tf->hob_feature = ioread32(ioaddr->error_addr);
408 tf->hob_nsect = ioread32(ioaddr->nsect_addr);
409 tf->hob_lbal = ioread32(ioaddr->lbal_addr);
410 tf->hob_lbam = ioread32(ioaddr->lbam_addr);
411 tf->hob_lbah = ioread32(ioaddr->lbah_addr);
412 iowrite32(tf->ctl, ioaddr->ctl_addr);
413 ap->last_ctl = tf->ctl;
414 }
415 }
416
sata_rcar_exec_command(struct ata_port * ap,const struct ata_taskfile * tf)417 static void sata_rcar_exec_command(struct ata_port *ap,
418 const struct ata_taskfile *tf)
419 {
420 iowrite32(tf->command, ap->ioaddr.command_addr);
421 ata_sff_pause(ap);
422 }
423
sata_rcar_data_xfer(struct ata_queued_cmd * qc,unsigned char * buf,unsigned int buflen,int rw)424 static unsigned int sata_rcar_data_xfer(struct ata_queued_cmd *qc,
425 unsigned char *buf,
426 unsigned int buflen, int rw)
427 {
428 struct ata_port *ap = qc->dev->link->ap;
429 void __iomem *data_addr = ap->ioaddr.data_addr;
430 unsigned int words = buflen >> 1;
431
432 /* Transfer multiple of 2 bytes */
433 if (rw == READ)
434 sata_rcar_ioread16_rep(data_addr, buf, words);
435 else
436 sata_rcar_iowrite16_rep(data_addr, buf, words);
437
438 /* Transfer trailing byte, if any. */
439 if (unlikely(buflen & 0x01)) {
440 unsigned char pad[2] = { };
441
442 /* Point buf to the tail of buffer */
443 buf += buflen - 1;
444
445 /*
446 * Use io*16_rep() accessors here as well to avoid pointlessly
447 * swapping bytes to and from on the big endian machines...
448 */
449 if (rw == READ) {
450 sata_rcar_ioread16_rep(data_addr, pad, 1);
451 *buf = pad[0];
452 } else {
453 pad[0] = *buf;
454 sata_rcar_iowrite16_rep(data_addr, pad, 1);
455 }
456 words++;
457 }
458
459 return words << 1;
460 }
461
sata_rcar_drain_fifo(struct ata_queued_cmd * qc)462 static void sata_rcar_drain_fifo(struct ata_queued_cmd *qc)
463 {
464 int count;
465 struct ata_port *ap;
466
467 /* We only need to flush incoming data when a command was running */
468 if (qc == NULL || qc->dma_dir == DMA_TO_DEVICE)
469 return;
470
471 ap = qc->ap;
472 /* Drain up to 64K of data before we give up this recovery method */
473 for (count = 0; (ap->ops->sff_check_status(ap) & ATA_DRQ) &&
474 count < 65536; count += 2)
475 ioread32(ap->ioaddr.data_addr);
476
477 if (count)
478 ata_port_dbg(ap, "drained %d bytes to clear DRQ\n", count);
479 }
480
sata_rcar_scr_read(struct ata_link * link,unsigned int sc_reg,u32 * val)481 static int sata_rcar_scr_read(struct ata_link *link, unsigned int sc_reg,
482 u32 *val)
483 {
484 if (sc_reg > SCR_ACTIVE)
485 return -EINVAL;
486
487 *val = ioread32(link->ap->ioaddr.scr_addr + (sc_reg << 2));
488 return 0;
489 }
490
sata_rcar_scr_write(struct ata_link * link,unsigned int sc_reg,u32 val)491 static int sata_rcar_scr_write(struct ata_link *link, unsigned int sc_reg,
492 u32 val)
493 {
494 if (sc_reg > SCR_ACTIVE)
495 return -EINVAL;
496
497 iowrite32(val, link->ap->ioaddr.scr_addr + (sc_reg << 2));
498 return 0;
499 }
500
sata_rcar_bmdma_fill_sg(struct ata_queued_cmd * qc)501 static void sata_rcar_bmdma_fill_sg(struct ata_queued_cmd *qc)
502 {
503 struct ata_port *ap = qc->ap;
504 struct ata_bmdma_prd *prd = ap->bmdma_prd;
505 struct scatterlist *sg;
506 unsigned int si;
507
508 for_each_sg(qc->sg, sg, qc->n_elem, si) {
509 u32 addr, sg_len;
510
511 /*
512 * Note: h/w doesn't support 64-bit, so we unconditionally
513 * truncate dma_addr_t to u32.
514 */
515 addr = (u32)sg_dma_address(sg);
516 sg_len = sg_dma_len(sg);
517
518 prd[si].addr = cpu_to_le32(addr);
519 prd[si].flags_len = cpu_to_le32(sg_len);
520 }
521
522 /* end-of-table flag */
523 prd[si - 1].addr |= cpu_to_le32(SATA_RCAR_DTEND);
524 }
525
sata_rcar_qc_prep(struct ata_queued_cmd * qc)526 static enum ata_completion_errors sata_rcar_qc_prep(struct ata_queued_cmd *qc)
527 {
528 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
529 return AC_ERR_OK;
530
531 sata_rcar_bmdma_fill_sg(qc);
532
533 return AC_ERR_OK;
534 }
535
sata_rcar_bmdma_setup(struct ata_queued_cmd * qc)536 static void sata_rcar_bmdma_setup(struct ata_queued_cmd *qc)
537 {
538 struct ata_port *ap = qc->ap;
539 unsigned int rw = qc->tf.flags & ATA_TFLAG_WRITE;
540 struct sata_rcar_priv *priv = ap->host->private_data;
541 void __iomem *base = priv->base;
542 u32 dmactl;
543
544 /* load PRD table addr. */
545 mb(); /* make sure PRD table writes are visible to controller */
546 iowrite32(ap->bmdma_prd_dma, base + ATAPI_DTB_ADR_REG);
547
548 /* specify data direction, triple-check start bit is clear */
549 dmactl = ioread32(base + ATAPI_CONTROL1_REG);
550 dmactl &= ~(ATAPI_CONTROL1_RW | ATAPI_CONTROL1_STOP);
551 if (dmactl & ATAPI_CONTROL1_START) {
552 dmactl &= ~ATAPI_CONTROL1_START;
553 dmactl |= ATAPI_CONTROL1_STOP;
554 }
555 if (!rw)
556 dmactl |= ATAPI_CONTROL1_RW;
557 iowrite32(dmactl, base + ATAPI_CONTROL1_REG);
558
559 /* issue r/w command */
560 ap->ops->sff_exec_command(ap, &qc->tf);
561 }
562
sata_rcar_bmdma_start(struct ata_queued_cmd * qc)563 static void sata_rcar_bmdma_start(struct ata_queued_cmd *qc)
564 {
565 struct ata_port *ap = qc->ap;
566 struct sata_rcar_priv *priv = ap->host->private_data;
567 void __iomem *base = priv->base;
568 u32 dmactl;
569
570 /* start host DMA transaction */
571 dmactl = ioread32(base + ATAPI_CONTROL1_REG);
572 dmactl &= ~ATAPI_CONTROL1_STOP;
573 dmactl |= ATAPI_CONTROL1_START;
574 iowrite32(dmactl, base + ATAPI_CONTROL1_REG);
575 }
576
sata_rcar_bmdma_stop(struct ata_queued_cmd * qc)577 static void sata_rcar_bmdma_stop(struct ata_queued_cmd *qc)
578 {
579 struct ata_port *ap = qc->ap;
580 struct sata_rcar_priv *priv = ap->host->private_data;
581 void __iomem *base = priv->base;
582 u32 dmactl;
583
584 /* force termination of DMA transfer if active */
585 dmactl = ioread32(base + ATAPI_CONTROL1_REG);
586 if (dmactl & ATAPI_CONTROL1_START) {
587 dmactl &= ~ATAPI_CONTROL1_START;
588 dmactl |= ATAPI_CONTROL1_STOP;
589 iowrite32(dmactl, base + ATAPI_CONTROL1_REG);
590 }
591
592 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
593 ata_sff_dma_pause(ap);
594 }
595
sata_rcar_bmdma_status(struct ata_port * ap)596 static u8 sata_rcar_bmdma_status(struct ata_port *ap)
597 {
598 struct sata_rcar_priv *priv = ap->host->private_data;
599 u8 host_stat = 0;
600 u32 status;
601
602 status = ioread32(priv->base + ATAPI_STATUS_REG);
603 if (status & ATAPI_STATUS_DEVINT)
604 host_stat |= ATA_DMA_INTR;
605 if (status & ATAPI_STATUS_ACT)
606 host_stat |= ATA_DMA_ACTIVE;
607
608 return host_stat;
609 }
610
611 static const struct scsi_host_template sata_rcar_sht = {
612 ATA_BASE_SHT(DRV_NAME),
613 /*
614 * This controller allows transfer chunks up to 512MB which cross 64KB
615 * boundaries, therefore the DMA limits are more relaxed than standard
616 * ATA SFF.
617 */
618 .sg_tablesize = ATA_MAX_PRD,
619 .dma_boundary = SATA_RCAR_DMA_BOUNDARY,
620 };
621
622 static struct ata_port_operations sata_rcar_port_ops = {
623 .inherits = &ata_bmdma_port_ops,
624
625 .freeze = sata_rcar_freeze,
626 .thaw = sata_rcar_thaw,
627 .softreset = sata_rcar_softreset,
628
629 .scr_read = sata_rcar_scr_read,
630 .scr_write = sata_rcar_scr_write,
631
632 .sff_dev_select = sata_rcar_dev_select,
633 .sff_set_devctl = sata_rcar_set_devctl,
634 .sff_check_status = sata_rcar_check_status,
635 .sff_check_altstatus = sata_rcar_check_altstatus,
636 .sff_tf_load = sata_rcar_tf_load,
637 .sff_tf_read = sata_rcar_tf_read,
638 .sff_exec_command = sata_rcar_exec_command,
639 .sff_data_xfer = sata_rcar_data_xfer,
640 .sff_drain_fifo = sata_rcar_drain_fifo,
641
642 .qc_prep = sata_rcar_qc_prep,
643
644 .bmdma_setup = sata_rcar_bmdma_setup,
645 .bmdma_start = sata_rcar_bmdma_start,
646 .bmdma_stop = sata_rcar_bmdma_stop,
647 .bmdma_status = sata_rcar_bmdma_status,
648 };
649
sata_rcar_serr_interrupt(struct ata_port * ap)650 static void sata_rcar_serr_interrupt(struct ata_port *ap)
651 {
652 struct sata_rcar_priv *priv = ap->host->private_data;
653 struct ata_eh_info *ehi = &ap->link.eh_info;
654 int freeze = 0;
655 u32 serror;
656
657 serror = ioread32(priv->base + SCRSERR_REG);
658 if (!serror)
659 return;
660
661 ata_port_dbg(ap, "SError @host_intr: 0x%x\n", serror);
662
663 /* first, analyze and record host port events */
664 ata_ehi_clear_desc(ehi);
665
666 if (serror & (SERR_DEV_XCHG | SERR_PHYRDY_CHG)) {
667 /* Setup a soft-reset EH action */
668 ata_ehi_hotplugged(ehi);
669 ata_ehi_push_desc(ehi, "%s", "hotplug");
670
671 freeze = serror & SERR_COMM_WAKE ? 0 : 1;
672 }
673
674 /* freeze or abort */
675 if (freeze)
676 ata_port_freeze(ap);
677 else
678 ata_port_abort(ap);
679 }
680
sata_rcar_ata_interrupt(struct ata_port * ap)681 static void sata_rcar_ata_interrupt(struct ata_port *ap)
682 {
683 struct ata_queued_cmd *qc;
684 int handled = 0;
685
686 qc = ata_qc_from_tag(ap, ap->link.active_tag);
687 if (qc)
688 handled |= ata_bmdma_port_intr(ap, qc);
689
690 /* be sure to clear ATA interrupt */
691 if (!handled)
692 sata_rcar_check_status(ap);
693 }
694
sata_rcar_interrupt(int irq,void * dev_instance)695 static irqreturn_t sata_rcar_interrupt(int irq, void *dev_instance)
696 {
697 struct ata_host *host = dev_instance;
698 struct sata_rcar_priv *priv = host->private_data;
699 void __iomem *base = priv->base;
700 unsigned int handled = 0;
701 struct ata_port *ap;
702 u32 sataintstat;
703 unsigned long flags;
704
705 spin_lock_irqsave(&host->lock, flags);
706
707 sataintstat = ioread32(base + SATAINTSTAT_REG);
708 sataintstat &= SATA_RCAR_INT_MASK;
709 if (!sataintstat)
710 goto done;
711 /* ack */
712 iowrite32(~sataintstat & priv->sataint_mask, base + SATAINTSTAT_REG);
713
714 ap = host->ports[0];
715
716 if (sataintstat & SATAINTSTAT_ATA)
717 sata_rcar_ata_interrupt(ap);
718
719 if (sataintstat & SATAINTSTAT_SERR)
720 sata_rcar_serr_interrupt(ap);
721
722 handled = 1;
723 done:
724 spin_unlock_irqrestore(&host->lock, flags);
725
726 return IRQ_RETVAL(handled);
727 }
728
sata_rcar_setup_port(struct ata_host * host)729 static void sata_rcar_setup_port(struct ata_host *host)
730 {
731 struct ata_port *ap = host->ports[0];
732 struct ata_ioports *ioaddr = &ap->ioaddr;
733 struct sata_rcar_priv *priv = host->private_data;
734 void __iomem *base = priv->base;
735
736 ap->ops = &sata_rcar_port_ops;
737 ap->pio_mask = ATA_PIO4;
738 ap->udma_mask = ATA_UDMA6;
739 ap->flags |= ATA_FLAG_SATA;
740
741 if (priv->type == RCAR_R8A7790_ES1_SATA)
742 ap->flags |= ATA_FLAG_NO_DIPM;
743
744 ioaddr->cmd_addr = base + SDATA_REG;
745 ioaddr->ctl_addr = base + SSDEVCON_REG;
746 ioaddr->scr_addr = base + SCRSSTS_REG;
747 ioaddr->altstatus_addr = ioaddr->ctl_addr;
748
749 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
750 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
751 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
752 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
753 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
754 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
755 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
756 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
757 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
758 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
759 }
760
sata_rcar_init_module(struct sata_rcar_priv * priv)761 static void sata_rcar_init_module(struct sata_rcar_priv *priv)
762 {
763 void __iomem *base = priv->base;
764 u32 val;
765
766 /* SATA-IP reset state */
767 val = ioread32(base + ATAPI_CONTROL1_REG);
768 val |= ATAPI_CONTROL1_RESET;
769 iowrite32(val, base + ATAPI_CONTROL1_REG);
770
771 /* ISM mode, PRD mode, DTEND flag at bit 0 */
772 val = ioread32(base + ATAPI_CONTROL1_REG);
773 val |= ATAPI_CONTROL1_ISM;
774 val |= ATAPI_CONTROL1_DESE;
775 val |= ATAPI_CONTROL1_DTA32M;
776 iowrite32(val, base + ATAPI_CONTROL1_REG);
777
778 /* Release the SATA-IP from the reset state */
779 val = ioread32(base + ATAPI_CONTROL1_REG);
780 val &= ~ATAPI_CONTROL1_RESET;
781 iowrite32(val, base + ATAPI_CONTROL1_REG);
782
783 /* ack and mask */
784 iowrite32(0, base + SATAINTSTAT_REG);
785 iowrite32(priv->sataint_mask, base + SATAINTMASK_REG);
786
787 /* enable interrupts */
788 iowrite32(ATAPI_INT_ENABLE_SATAINT, base + ATAPI_INT_ENABLE_REG);
789 }
790
sata_rcar_init_controller(struct ata_host * host)791 static void sata_rcar_init_controller(struct ata_host *host)
792 {
793 struct sata_rcar_priv *priv = host->private_data;
794
795 priv->sataint_mask = SATAINTMASK_ALL_GEN2;
796
797 /* reset and setup phy */
798 switch (priv->type) {
799 case RCAR_GEN1_SATA:
800 priv->sataint_mask = SATAINTMASK_ALL_GEN1;
801 sata_rcar_gen1_phy_init(priv);
802 break;
803 case RCAR_GEN2_SATA:
804 case RCAR_R8A7790_ES1_SATA:
805 sata_rcar_gen2_phy_init(priv);
806 break;
807 case RCAR_GEN3_SATA:
808 break;
809 default:
810 dev_warn(host->dev, "SATA phy is not initialized\n");
811 break;
812 }
813
814 sata_rcar_init_module(priv);
815 }
816
817 static const struct of_device_id sata_rcar_match[] = {
818 {
819 /* Deprecated by "renesas,sata-r8a7779" */
820 .compatible = "renesas,rcar-sata",
821 .data = (void *)RCAR_GEN1_SATA,
822 },
823 {
824 .compatible = "renesas,sata-r8a7779",
825 .data = (void *)RCAR_GEN1_SATA,
826 },
827 {
828 .compatible = "renesas,sata-r8a7790",
829 .data = (void *)RCAR_GEN2_SATA
830 },
831 {
832 .compatible = "renesas,sata-r8a7790-es1",
833 .data = (void *)RCAR_R8A7790_ES1_SATA
834 },
835 {
836 .compatible = "renesas,sata-r8a7791",
837 .data = (void *)RCAR_GEN2_SATA
838 },
839 {
840 .compatible = "renesas,sata-r8a7793",
841 .data = (void *)RCAR_GEN2_SATA
842 },
843 {
844 .compatible = "renesas,sata-r8a7795",
845 .data = (void *)RCAR_GEN3_SATA
846 },
847 {
848 .compatible = "renesas,rcar-gen2-sata",
849 .data = (void *)RCAR_GEN2_SATA
850 },
851 {
852 .compatible = "renesas,rcar-gen3-sata",
853 .data = (void *)RCAR_GEN3_SATA
854 },
855 { /* sentinel */ }
856 };
857 MODULE_DEVICE_TABLE(of, sata_rcar_match);
858
sata_rcar_probe(struct platform_device * pdev)859 static int sata_rcar_probe(struct platform_device *pdev)
860 {
861 struct device *dev = &pdev->dev;
862 struct ata_host *host;
863 struct sata_rcar_priv *priv;
864 int irq, ret;
865
866 irq = platform_get_irq(pdev, 0);
867 if (irq < 0)
868 return irq;
869
870 priv = devm_kzalloc(dev, sizeof(struct sata_rcar_priv), GFP_KERNEL);
871 if (!priv)
872 return -ENOMEM;
873
874 priv->type = (unsigned long)of_device_get_match_data(dev);
875
876 pm_runtime_enable(dev);
877 ret = pm_runtime_get_sync(dev);
878 if (ret < 0)
879 goto err_pm_put;
880
881 host = ata_host_alloc(dev, 1);
882 if (!host) {
883 ret = -ENOMEM;
884 goto err_pm_put;
885 }
886
887 host->private_data = priv;
888
889 priv->base = devm_platform_ioremap_resource(pdev, 0);
890 if (IS_ERR(priv->base)) {
891 ret = PTR_ERR(priv->base);
892 goto err_pm_put;
893 }
894
895 /* setup port */
896 sata_rcar_setup_port(host);
897
898 /* initialize host controller */
899 sata_rcar_init_controller(host);
900
901 ret = ata_host_activate(host, irq, sata_rcar_interrupt, 0,
902 &sata_rcar_sht);
903 if (!ret)
904 return 0;
905
906 err_pm_put:
907 pm_runtime_put(dev);
908 pm_runtime_disable(dev);
909 return ret;
910 }
911
sata_rcar_remove(struct platform_device * pdev)912 static void sata_rcar_remove(struct platform_device *pdev)
913 {
914 struct ata_host *host = platform_get_drvdata(pdev);
915 struct sata_rcar_priv *priv = host->private_data;
916 void __iomem *base = priv->base;
917
918 ata_host_detach(host);
919
920 /* disable interrupts */
921 iowrite32(0, base + ATAPI_INT_ENABLE_REG);
922 /* ack and mask */
923 iowrite32(0, base + SATAINTSTAT_REG);
924 iowrite32(priv->sataint_mask, base + SATAINTMASK_REG);
925
926 pm_runtime_put(&pdev->dev);
927 pm_runtime_disable(&pdev->dev);
928 }
929
930 #ifdef CONFIG_PM_SLEEP
sata_rcar_suspend(struct device * dev)931 static int sata_rcar_suspend(struct device *dev)
932 {
933 struct ata_host *host = dev_get_drvdata(dev);
934 struct sata_rcar_priv *priv = host->private_data;
935 void __iomem *base = priv->base;
936
937 ata_host_suspend(host, PMSG_SUSPEND);
938
939 /* disable interrupts */
940 iowrite32(0, base + ATAPI_INT_ENABLE_REG);
941 /* mask */
942 iowrite32(priv->sataint_mask, base + SATAINTMASK_REG);
943
944 pm_runtime_put(dev);
945
946 return 0;
947 }
948
sata_rcar_resume(struct device * dev)949 static int sata_rcar_resume(struct device *dev)
950 {
951 struct ata_host *host = dev_get_drvdata(dev);
952 struct sata_rcar_priv *priv = host->private_data;
953 void __iomem *base = priv->base;
954 int ret;
955
956 ret = pm_runtime_get_sync(dev);
957 if (ret < 0) {
958 pm_runtime_put(dev);
959 return ret;
960 }
961
962 if (priv->type == RCAR_GEN3_SATA) {
963 sata_rcar_init_module(priv);
964 } else {
965 /* ack and mask */
966 iowrite32(0, base + SATAINTSTAT_REG);
967 iowrite32(priv->sataint_mask, base + SATAINTMASK_REG);
968
969 /* enable interrupts */
970 iowrite32(ATAPI_INT_ENABLE_SATAINT,
971 base + ATAPI_INT_ENABLE_REG);
972 }
973
974 ata_host_resume(host);
975
976 return 0;
977 }
978
sata_rcar_restore(struct device * dev)979 static int sata_rcar_restore(struct device *dev)
980 {
981 struct ata_host *host = dev_get_drvdata(dev);
982 int ret;
983
984 ret = pm_runtime_get_sync(dev);
985 if (ret < 0) {
986 pm_runtime_put(dev);
987 return ret;
988 }
989
990 sata_rcar_setup_port(host);
991
992 /* initialize host controller */
993 sata_rcar_init_controller(host);
994
995 ata_host_resume(host);
996
997 return 0;
998 }
999
1000 static const struct dev_pm_ops sata_rcar_pm_ops = {
1001 .suspend = sata_rcar_suspend,
1002 .resume = sata_rcar_resume,
1003 .freeze = sata_rcar_suspend,
1004 .thaw = sata_rcar_resume,
1005 .poweroff = sata_rcar_suspend,
1006 .restore = sata_rcar_restore,
1007 };
1008 #endif
1009
1010 static struct platform_driver sata_rcar_driver = {
1011 .probe = sata_rcar_probe,
1012 .remove_new = sata_rcar_remove,
1013 .driver = {
1014 .name = DRV_NAME,
1015 .of_match_table = sata_rcar_match,
1016 #ifdef CONFIG_PM_SLEEP
1017 .pm = &sata_rcar_pm_ops,
1018 #endif
1019 },
1020 };
1021
1022 module_platform_driver(sata_rcar_driver);
1023
1024 MODULE_LICENSE("GPL");
1025 MODULE_AUTHOR("Vladimir Barinov");
1026 MODULE_DESCRIPTION("Renesas R-Car SATA controller low level driver");
1027