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14#include <linux/module.h>
15#include <linux/dmaengine.h>
16#include <linux/dma-mapping.h>
17#include <linux/clk.h>
18#include <linux/mmc/host.h>
19#include <linux/platform_device.h>
20#include <linux/cpufreq.h>
21#include <linux/debugfs.h>
22#include <linux/seq_file.h>
23#include <linux/gpio.h>
24#include <linux/irq.h>
25#include <linux/io.h>
26
27#include <plat/gpio-cfg.h>
28#include <mach/dma.h>
29#include <mach/gpio-samsung.h>
30
31#include <linux/platform_data/dma-s3c24xx.h>
32#include <linux/platform_data/mmc-s3cmci.h>
33
34#include "s3cmci.h"
35
36#define DRIVER_NAME "s3c-mci"
37
38#define S3C2410_SDICON (0x00)
39#define S3C2410_SDIPRE (0x04)
40#define S3C2410_SDICMDARG (0x08)
41#define S3C2410_SDICMDCON (0x0C)
42#define S3C2410_SDICMDSTAT (0x10)
43#define S3C2410_SDIRSP0 (0x14)
44#define S3C2410_SDIRSP1 (0x18)
45#define S3C2410_SDIRSP2 (0x1C)
46#define S3C2410_SDIRSP3 (0x20)
47#define S3C2410_SDITIMER (0x24)
48#define S3C2410_SDIBSIZE (0x28)
49#define S3C2410_SDIDCON (0x2C)
50#define S3C2410_SDIDCNT (0x30)
51#define S3C2410_SDIDSTA (0x34)
52#define S3C2410_SDIFSTA (0x38)
53
54#define S3C2410_SDIDATA (0x3C)
55#define S3C2410_SDIIMSK (0x40)
56
57#define S3C2440_SDIDATA (0x40)
58#define S3C2440_SDIIMSK (0x3C)
59
60#define S3C2440_SDICON_SDRESET (1 << 8)
61#define S3C2410_SDICON_SDIOIRQ (1 << 3)
62#define S3C2410_SDICON_FIFORESET (1 << 1)
63#define S3C2410_SDICON_CLOCKTYPE (1 << 0)
64
65#define S3C2410_SDICMDCON_LONGRSP (1 << 10)
66#define S3C2410_SDICMDCON_WAITRSP (1 << 9)
67#define S3C2410_SDICMDCON_CMDSTART (1 << 8)
68#define S3C2410_SDICMDCON_SENDERHOST (1 << 6)
69#define S3C2410_SDICMDCON_INDEX (0x3f)
70
71#define S3C2410_SDICMDSTAT_CRCFAIL (1 << 12)
72#define S3C2410_SDICMDSTAT_CMDSENT (1 << 11)
73#define S3C2410_SDICMDSTAT_CMDTIMEOUT (1 << 10)
74#define S3C2410_SDICMDSTAT_RSPFIN (1 << 9)
75
76#define S3C2440_SDIDCON_DS_WORD (2 << 22)
77#define S3C2410_SDIDCON_TXAFTERRESP (1 << 20)
78#define S3C2410_SDIDCON_RXAFTERCMD (1 << 19)
79#define S3C2410_SDIDCON_BLOCKMODE (1 << 17)
80#define S3C2410_SDIDCON_WIDEBUS (1 << 16)
81#define S3C2410_SDIDCON_DMAEN (1 << 15)
82#define S3C2410_SDIDCON_STOP (1 << 14)
83#define S3C2440_SDIDCON_DATSTART (1 << 14)
84
85#define S3C2410_SDIDCON_XFER_RXSTART (2 << 12)
86#define S3C2410_SDIDCON_XFER_TXSTART (3 << 12)
87
88#define S3C2410_SDIDCON_BLKNUM_MASK (0xFFF)
89
90#define S3C2410_SDIDSTA_SDIOIRQDETECT (1 << 9)
91#define S3C2410_SDIDSTA_FIFOFAIL (1 << 8)
92#define S3C2410_SDIDSTA_CRCFAIL (1 << 7)
93#define S3C2410_SDIDSTA_RXCRCFAIL (1 << 6)
94#define S3C2410_SDIDSTA_DATATIMEOUT (1 << 5)
95#define S3C2410_SDIDSTA_XFERFINISH (1 << 4)
96#define S3C2410_SDIDSTA_TXDATAON (1 << 1)
97#define S3C2410_SDIDSTA_RXDATAON (1 << 0)
98
99#define S3C2440_SDIFSTA_FIFORESET (1 << 16)
100#define S3C2440_SDIFSTA_FIFOFAIL (3 << 14)
101#define S3C2410_SDIFSTA_TFDET (1 << 13)
102#define S3C2410_SDIFSTA_RFDET (1 << 12)
103#define S3C2410_SDIFSTA_COUNTMASK (0x7f)
104
105#define S3C2410_SDIIMSK_RESPONSECRC (1 << 17)
106#define S3C2410_SDIIMSK_CMDSENT (1 << 16)
107#define S3C2410_SDIIMSK_CMDTIMEOUT (1 << 15)
108#define S3C2410_SDIIMSK_RESPONSEND (1 << 14)
109#define S3C2410_SDIIMSK_SDIOIRQ (1 << 12)
110#define S3C2410_SDIIMSK_FIFOFAIL (1 << 11)
111#define S3C2410_SDIIMSK_CRCSTATUS (1 << 10)
112#define S3C2410_SDIIMSK_DATACRC (1 << 9)
113#define S3C2410_SDIIMSK_DATATIMEOUT (1 << 8)
114#define S3C2410_SDIIMSK_DATAFINISH (1 << 7)
115#define S3C2410_SDIIMSK_TXFIFOHALF (1 << 4)
116#define S3C2410_SDIIMSK_RXFIFOLAST (1 << 2)
117#define S3C2410_SDIIMSK_RXFIFOHALF (1 << 0)
118
119enum dbg_channels {
120 dbg_err = (1 << 0),
121 dbg_debug = (1 << 1),
122 dbg_info = (1 << 2),
123 dbg_irq = (1 << 3),
124 dbg_sg = (1 << 4),
125 dbg_dma = (1 << 5),
126 dbg_pio = (1 << 6),
127 dbg_fail = (1 << 7),
128 dbg_conf = (1 << 8),
129};
130
131static const int dbgmap_err = dbg_fail;
132static const int dbgmap_info = dbg_info | dbg_conf;
133static const int dbgmap_debug = dbg_err | dbg_debug;
134
135#define dbg(host, channels, args...) \
136 do { \
137 if (dbgmap_err & channels) \
138 dev_err(&host->pdev->dev, args); \
139 else if (dbgmap_info & channels) \
140 dev_info(&host->pdev->dev, args); \
141 else if (dbgmap_debug & channels) \
142 dev_dbg(&host->pdev->dev, args); \
143 } while (0)
144
145static void finalize_request(struct s3cmci_host *host);
146static void s3cmci_send_request(struct mmc_host *mmc);
147static void s3cmci_reset(struct s3cmci_host *host);
148
149#ifdef CONFIG_MMC_DEBUG
150
151static void dbg_dumpregs(struct s3cmci_host *host, char *prefix)
152{
153 u32 con, pre, cmdarg, cmdcon, cmdsta, r0, r1, r2, r3, timer, bsize;
154 u32 datcon, datcnt, datsta, fsta, imask;
155
156 con = readl(host->base + S3C2410_SDICON);
157 pre = readl(host->base + S3C2410_SDIPRE);
158 cmdarg = readl(host->base + S3C2410_SDICMDARG);
159 cmdcon = readl(host->base + S3C2410_SDICMDCON);
160 cmdsta = readl(host->base + S3C2410_SDICMDSTAT);
161 r0 = readl(host->base + S3C2410_SDIRSP0);
162 r1 = readl(host->base + S3C2410_SDIRSP1);
163 r2 = readl(host->base + S3C2410_SDIRSP2);
164 r3 = readl(host->base + S3C2410_SDIRSP3);
165 timer = readl(host->base + S3C2410_SDITIMER);
166 bsize = readl(host->base + S3C2410_SDIBSIZE);
167 datcon = readl(host->base + S3C2410_SDIDCON);
168 datcnt = readl(host->base + S3C2410_SDIDCNT);
169 datsta = readl(host->base + S3C2410_SDIDSTA);
170 fsta = readl(host->base + S3C2410_SDIFSTA);
171 imask = readl(host->base + host->sdiimsk);
172
173 dbg(host, dbg_debug, "%s CON:[%08x] PRE:[%08x] TMR:[%08x]\n",
174 prefix, con, pre, timer);
175
176 dbg(host, dbg_debug, "%s CCON:[%08x] CARG:[%08x] CSTA:[%08x]\n",
177 prefix, cmdcon, cmdarg, cmdsta);
178
179 dbg(host, dbg_debug, "%s DCON:[%08x] FSTA:[%08x]"
180 " DSTA:[%08x] DCNT:[%08x]\n",
181 prefix, datcon, fsta, datsta, datcnt);
182
183 dbg(host, dbg_debug, "%s R0:[%08x] R1:[%08x]"
184 " R2:[%08x] R3:[%08x]\n",
185 prefix, r0, r1, r2, r3);
186}
187
188static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
189 int stop)
190{
191 snprintf(host->dbgmsg_cmd, 300,
192 "#%u%s op:%i arg:0x%08x flags:0x08%x retries:%u",
193 host->ccnt, (stop ? " (STOP)" : ""),
194 cmd->opcode, cmd->arg, cmd->flags, cmd->retries);
195
196 if (cmd->data) {
197 snprintf(host->dbgmsg_dat, 300,
198 "#%u bsize:%u blocks:%u bytes:%u",
199 host->dcnt, cmd->data->blksz,
200 cmd->data->blocks,
201 cmd->data->blocks * cmd->data->blksz);
202 } else {
203 host->dbgmsg_dat[0] = '\0';
204 }
205}
206
207static void dbg_dumpcmd(struct s3cmci_host *host, struct mmc_command *cmd,
208 int fail)
209{
210 unsigned int dbglvl = fail ? dbg_fail : dbg_debug;
211
212 if (!cmd)
213 return;
214
215 if (cmd->error == 0) {
216 dbg(host, dbglvl, "CMD[OK] %s R0:0x%08x\n",
217 host->dbgmsg_cmd, cmd->resp[0]);
218 } else {
219 dbg(host, dbglvl, "CMD[ERR %i] %s Status:%s\n",
220 cmd->error, host->dbgmsg_cmd, host->status);
221 }
222
223 if (!cmd->data)
224 return;
225
226 if (cmd->data->error == 0) {
227 dbg(host, dbglvl, "DAT[OK] %s\n", host->dbgmsg_dat);
228 } else {
229 dbg(host, dbglvl, "DAT[ERR %i] %s DCNT:0x%08x\n",
230 cmd->data->error, host->dbgmsg_dat,
231 readl(host->base + S3C2410_SDIDCNT));
232 }
233}
234#else
235static void dbg_dumpcmd(struct s3cmci_host *host,
236 struct mmc_command *cmd, int fail) { }
237
238static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
239 int stop) { }
240
241static void dbg_dumpregs(struct s3cmci_host *host, char *prefix) { }
242
243#endif
244
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252
253static inline bool s3cmci_host_usedma(struct s3cmci_host *host)
254{
255#ifdef CONFIG_MMC_S3C_PIO
256 return false;
257#else
258 return true;
259#endif
260}
261
262static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
263{
264 u32 newmask;
265
266 newmask = readl(host->base + host->sdiimsk);
267 newmask |= imask;
268
269 writel(newmask, host->base + host->sdiimsk);
270
271 return newmask;
272}
273
274static inline u32 disable_imask(struct s3cmci_host *host, u32 imask)
275{
276 u32 newmask;
277
278 newmask = readl(host->base + host->sdiimsk);
279 newmask &= ~imask;
280
281 writel(newmask, host->base + host->sdiimsk);
282
283 return newmask;
284}
285
286static inline void clear_imask(struct s3cmci_host *host)
287{
288 u32 mask = readl(host->base + host->sdiimsk);
289
290
291 mask &= S3C2410_SDIIMSK_SDIOIRQ;
292 writel(mask, host->base + host->sdiimsk);
293}
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306
307static void s3cmci_check_sdio_irq(struct s3cmci_host *host)
308{
309 if (host->sdio_irqen) {
310 if (gpio_get_value(S3C2410_GPE(8)) == 0) {
311 pr_debug("%s: signalling irq\n", __func__);
312 mmc_signal_sdio_irq(host->mmc);
313 }
314 }
315}
316
317static inline int get_data_buffer(struct s3cmci_host *host,
318 u32 *bytes, u32 **pointer)
319{
320 struct scatterlist *sg;
321
322 if (host->pio_active == XFER_NONE)
323 return -EINVAL;
324
325 if ((!host->mrq) || (!host->mrq->data))
326 return -EINVAL;
327
328 if (host->pio_sgptr >= host->mrq->data->sg_len) {
329 dbg(host, dbg_debug, "no more buffers (%i/%i)\n",
330 host->pio_sgptr, host->mrq->data->sg_len);
331 return -EBUSY;
332 }
333 sg = &host->mrq->data->sg[host->pio_sgptr];
334
335 *bytes = sg->length;
336 *pointer = sg_virt(sg);
337
338 host->pio_sgptr++;
339
340 dbg(host, dbg_sg, "new buffer (%i/%i)\n",
341 host->pio_sgptr, host->mrq->data->sg_len);
342
343 return 0;
344}
345
346static inline u32 fifo_count(struct s3cmci_host *host)
347{
348 u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
349
350 fifostat &= S3C2410_SDIFSTA_COUNTMASK;
351 return fifostat;
352}
353
354static inline u32 fifo_free(struct s3cmci_host *host)
355{
356 u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
357
358 fifostat &= S3C2410_SDIFSTA_COUNTMASK;
359 return 63 - fifostat;
360}
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375static void s3cmci_enable_irq(struct s3cmci_host *host, bool more)
376{
377 unsigned long flags;
378 bool enable = false;
379
380 local_irq_save(flags);
381
382 host->irq_enabled = more;
383 host->irq_disabled = false;
384
385 enable = more | host->sdio_irqen;
386
387 if (host->irq_state != enable) {
388 host->irq_state = enable;
389
390 if (enable)
391 enable_irq(host->irq);
392 else
393 disable_irq(host->irq);
394 }
395
396 local_irq_restore(flags);
397}
398
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401
402static void s3cmci_disable_irq(struct s3cmci_host *host, bool transfer)
403{
404 unsigned long flags;
405
406 local_irq_save(flags);
407
408
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410 host->irq_disabled = transfer;
411
412 if (transfer && host->irq_state) {
413 host->irq_state = false;
414 disable_irq(host->irq);
415 }
416
417 local_irq_restore(flags);
418}
419
420static void do_pio_read(struct s3cmci_host *host)
421{
422 int res;
423 u32 fifo;
424 u32 *ptr;
425 u32 fifo_words;
426 void __iomem *from_ptr;
427
428
429 writel(host->prescaler, host->base + S3C2410_SDIPRE);
430
431 from_ptr = host->base + host->sdidata;
432
433 while ((fifo = fifo_count(host))) {
434 if (!host->pio_bytes) {
435 res = get_data_buffer(host, &host->pio_bytes,
436 &host->pio_ptr);
437 if (res) {
438 host->pio_active = XFER_NONE;
439 host->complete_what = COMPLETION_FINALIZE;
440
441 dbg(host, dbg_pio, "pio_read(): "
442 "complete (no more data).\n");
443 return;
444 }
445
446 dbg(host, dbg_pio,
447 "pio_read(): new target: [%i]@[%p]\n",
448 host->pio_bytes, host->pio_ptr);
449 }
450
451 dbg(host, dbg_pio,
452 "pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
453 fifo, host->pio_bytes,
454 readl(host->base + S3C2410_SDIDCNT));
455
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461 if (fifo >= host->pio_bytes)
462 fifo = host->pio_bytes;
463 else
464 fifo -= fifo & 3;
465
466 host->pio_bytes -= fifo;
467 host->pio_count += fifo;
468
469 fifo_words = fifo >> 2;
470 ptr = host->pio_ptr;
471 while (fifo_words--)
472 *ptr++ = readl(from_ptr);
473 host->pio_ptr = ptr;
474
475 if (fifo & 3) {
476 u32 n = fifo & 3;
477 u32 data = readl(from_ptr);
478 u8 *p = (u8 *)host->pio_ptr;
479
480 while (n--) {
481 *p++ = data;
482 data >>= 8;
483 }
484 }
485 }
486
487 if (!host->pio_bytes) {
488 res = get_data_buffer(host, &host->pio_bytes, &host->pio_ptr);
489 if (res) {
490 dbg(host, dbg_pio,
491 "pio_read(): complete (no more buffers).\n");
492 host->pio_active = XFER_NONE;
493 host->complete_what = COMPLETION_FINALIZE;
494
495 return;
496 }
497 }
498
499 enable_imask(host,
500 S3C2410_SDIIMSK_RXFIFOHALF | S3C2410_SDIIMSK_RXFIFOLAST);
501}
502
503static void do_pio_write(struct s3cmci_host *host)
504{
505 void __iomem *to_ptr;
506 int res;
507 u32 fifo;
508 u32 *ptr;
509
510 to_ptr = host->base + host->sdidata;
511
512 while ((fifo = fifo_free(host)) > 3) {
513 if (!host->pio_bytes) {
514 res = get_data_buffer(host, &host->pio_bytes,
515 &host->pio_ptr);
516 if (res) {
517 dbg(host, dbg_pio,
518 "pio_write(): complete (no more data).\n");
519 host->pio_active = XFER_NONE;
520
521 return;
522 }
523
524 dbg(host, dbg_pio,
525 "pio_write(): new source: [%i]@[%p]\n",
526 host->pio_bytes, host->pio_ptr);
527
528 }
529
530
531
532
533
534 if (fifo >= host->pio_bytes)
535 fifo = host->pio_bytes;
536 else
537 fifo -= fifo & 3;
538
539 host->pio_bytes -= fifo;
540 host->pio_count += fifo;
541
542 fifo = (fifo + 3) >> 2;
543 ptr = host->pio_ptr;
544 while (fifo--)
545 writel(*ptr++, to_ptr);
546 host->pio_ptr = ptr;
547 }
548
549 enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
550}
551
552static void pio_tasklet(unsigned long data)
553{
554 struct s3cmci_host *host = (struct s3cmci_host *) data;
555
556 s3cmci_disable_irq(host, true);
557
558 if (host->pio_active == XFER_WRITE)
559 do_pio_write(host);
560
561 if (host->pio_active == XFER_READ)
562 do_pio_read(host);
563
564 if (host->complete_what == COMPLETION_FINALIZE) {
565 clear_imask(host);
566 if (host->pio_active != XFER_NONE) {
567 dbg(host, dbg_err, "unfinished %s "
568 "- pio_count:[%u] pio_bytes:[%u]\n",
569 (host->pio_active == XFER_READ) ? "read" : "write",
570 host->pio_count, host->pio_bytes);
571
572 if (host->mrq->data)
573 host->mrq->data->error = -EINVAL;
574 }
575
576 s3cmci_enable_irq(host, false);
577 finalize_request(host);
578 } else
579 s3cmci_enable_irq(host, true);
580}
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609static irqreturn_t s3cmci_irq(int irq, void *dev_id)
610{
611 struct s3cmci_host *host = dev_id;
612 struct mmc_command *cmd;
613 u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
614 u32 mci_cclear = 0, mci_dclear;
615 unsigned long iflags;
616
617 mci_dsta = readl(host->base + S3C2410_SDIDSTA);
618 mci_imsk = readl(host->base + host->sdiimsk);
619
620 if (mci_dsta & S3C2410_SDIDSTA_SDIOIRQDETECT) {
621 if (mci_imsk & S3C2410_SDIIMSK_SDIOIRQ) {
622 mci_dclear = S3C2410_SDIDSTA_SDIOIRQDETECT;
623 writel(mci_dclear, host->base + S3C2410_SDIDSTA);
624
625 mmc_signal_sdio_irq(host->mmc);
626 return IRQ_HANDLED;
627 }
628 }
629
630 spin_lock_irqsave(&host->complete_lock, iflags);
631
632 mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
633 mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
634 mci_fsta = readl(host->base + S3C2410_SDIFSTA);
635 mci_dclear = 0;
636
637 if ((host->complete_what == COMPLETION_NONE) ||
638 (host->complete_what == COMPLETION_FINALIZE)) {
639 host->status = "nothing to complete";
640 clear_imask(host);
641 goto irq_out;
642 }
643
644 if (!host->mrq) {
645 host->status = "no active mrq";
646 clear_imask(host);
647 goto irq_out;
648 }
649
650 cmd = host->cmd_is_stop ? host->mrq->stop : host->mrq->cmd;
651
652 if (!cmd) {
653 host->status = "no active cmd";
654 clear_imask(host);
655 goto irq_out;
656 }
657
658 if (!s3cmci_host_usedma(host)) {
659 if ((host->pio_active == XFER_WRITE) &&
660 (mci_fsta & S3C2410_SDIFSTA_TFDET)) {
661
662 disable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
663 tasklet_schedule(&host->pio_tasklet);
664 host->status = "pio tx";
665 }
666
667 if ((host->pio_active == XFER_READ) &&
668 (mci_fsta & S3C2410_SDIFSTA_RFDET)) {
669
670 disable_imask(host,
671 S3C2410_SDIIMSK_RXFIFOHALF |
672 S3C2410_SDIIMSK_RXFIFOLAST);
673
674 tasklet_schedule(&host->pio_tasklet);
675 host->status = "pio rx";
676 }
677 }
678
679 if (mci_csta & S3C2410_SDICMDSTAT_CMDTIMEOUT) {
680 dbg(host, dbg_err, "CMDSTAT: error CMDTIMEOUT\n");
681 cmd->error = -ETIMEDOUT;
682 host->status = "error: command timeout";
683 goto fail_transfer;
684 }
685
686 if (mci_csta & S3C2410_SDICMDSTAT_CMDSENT) {
687 if (host->complete_what == COMPLETION_CMDSENT) {
688 host->status = "ok: command sent";
689 goto close_transfer;
690 }
691
692 mci_cclear |= S3C2410_SDICMDSTAT_CMDSENT;
693 }
694
695 if (mci_csta & S3C2410_SDICMDSTAT_CRCFAIL) {
696 if (cmd->flags & MMC_RSP_CRC) {
697 if (host->mrq->cmd->flags & MMC_RSP_136) {
698 dbg(host, dbg_irq,
699 "fixup: ignore CRC fail with long rsp\n");
700 } else {
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707
708
709 }
710 }
711
712 mci_cclear |= S3C2410_SDICMDSTAT_CRCFAIL;
713 }
714
715 if (mci_csta & S3C2410_SDICMDSTAT_RSPFIN) {
716 if (host->complete_what == COMPLETION_RSPFIN) {
717 host->status = "ok: command response received";
718 goto close_transfer;
719 }
720
721 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
722 host->complete_what = COMPLETION_XFERFINISH;
723
724 mci_cclear |= S3C2410_SDICMDSTAT_RSPFIN;
725 }
726
727
728
729
730 if (!cmd->data)
731 goto clear_status_bits;
732
733
734 if (host->is2440) {
735 if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
736 dbg(host, dbg_err, "FIFO failure\n");
737 host->mrq->data->error = -EILSEQ;
738 host->status = "error: 2440 fifo failure";
739 goto fail_transfer;
740 }
741 } else {
742 if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
743 dbg(host, dbg_err, "FIFO failure\n");
744 cmd->data->error = -EILSEQ;
745 host->status = "error: fifo failure";
746 goto fail_transfer;
747 }
748 }
749
750 if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
751 dbg(host, dbg_err, "bad data crc (outgoing)\n");
752 cmd->data->error = -EILSEQ;
753 host->status = "error: bad data crc (outgoing)";
754 goto fail_transfer;
755 }
756
757 if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
758 dbg(host, dbg_err, "bad data crc (incoming)\n");
759 cmd->data->error = -EILSEQ;
760 host->status = "error: bad data crc (incoming)";
761 goto fail_transfer;
762 }
763
764 if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
765 dbg(host, dbg_err, "data timeout\n");
766 cmd->data->error = -ETIMEDOUT;
767 host->status = "error: data timeout";
768 goto fail_transfer;
769 }
770
771 if (mci_dsta & S3C2410_SDIDSTA_XFERFINISH) {
772 if (host->complete_what == COMPLETION_XFERFINISH) {
773 host->status = "ok: data transfer completed";
774 goto close_transfer;
775 }
776
777 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
778 host->complete_what = COMPLETION_RSPFIN;
779
780 mci_dclear |= S3C2410_SDIDSTA_XFERFINISH;
781 }
782
783clear_status_bits:
784 writel(mci_cclear, host->base + S3C2410_SDICMDSTAT);
785 writel(mci_dclear, host->base + S3C2410_SDIDSTA);
786
787 goto irq_out;
788
789fail_transfer:
790 host->pio_active = XFER_NONE;
791
792close_transfer:
793 host->complete_what = COMPLETION_FINALIZE;
794
795 clear_imask(host);
796 tasklet_schedule(&host->pio_tasklet);
797
798 goto irq_out;
799
800irq_out:
801 dbg(host, dbg_irq,
802 "csta:0x%08x dsta:0x%08x fsta:0x%08x dcnt:0x%08x status:%s.\n",
803 mci_csta, mci_dsta, mci_fsta, mci_dcnt, host->status);
804
805 spin_unlock_irqrestore(&host->complete_lock, iflags);
806 return IRQ_HANDLED;
807
808}
809
810
811
812
813
814static irqreturn_t s3cmci_irq_cd(int irq, void *dev_id)
815{
816 struct s3cmci_host *host = (struct s3cmci_host *)dev_id;
817
818 dbg(host, dbg_irq, "card detect\n");
819
820 mmc_detect_change(host->mmc, msecs_to_jiffies(500));
821
822 return IRQ_HANDLED;
823}
824
825static void s3cmci_dma_done_callback(void *arg)
826{
827 struct s3cmci_host *host = arg;
828 unsigned long iflags;
829
830 BUG_ON(!host->mrq);
831 BUG_ON(!host->mrq->data);
832
833 spin_lock_irqsave(&host->complete_lock, iflags);
834
835 dbg(host, dbg_dma, "DMA FINISHED\n");
836
837 host->dma_complete = 1;
838 host->complete_what = COMPLETION_FINALIZE;
839
840 tasklet_schedule(&host->pio_tasklet);
841 spin_unlock_irqrestore(&host->complete_lock, iflags);
842
843}
844
845static void finalize_request(struct s3cmci_host *host)
846{
847 struct mmc_request *mrq = host->mrq;
848 struct mmc_command *cmd;
849 int debug_as_failure = 0;
850
851 if (host->complete_what != COMPLETION_FINALIZE)
852 return;
853
854 if (!mrq)
855 return;
856 cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
857
858 if (cmd->data && (cmd->error == 0) &&
859 (cmd->data->error == 0)) {
860 if (s3cmci_host_usedma(host) && (!host->dma_complete)) {
861 dbg(host, dbg_dma, "DMA Missing (%d)!\n",
862 host->dma_complete);
863 return;
864 }
865 }
866
867
868 cmd->resp[0] = readl(host->base + S3C2410_SDIRSP0);
869 cmd->resp[1] = readl(host->base + S3C2410_SDIRSP1);
870 cmd->resp[2] = readl(host->base + S3C2410_SDIRSP2);
871 cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3);
872
873 writel(host->prescaler, host->base + S3C2410_SDIPRE);
874
875 if (cmd->error)
876 debug_as_failure = 1;
877
878 if (cmd->data && cmd->data->error)
879 debug_as_failure = 1;
880
881 dbg_dumpcmd(host, cmd, debug_as_failure);
882
883
884 writel(0, host->base + S3C2410_SDICMDARG);
885 writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
886 writel(0, host->base + S3C2410_SDICMDCON);
887 clear_imask(host);
888
889 if (cmd->data && cmd->error)
890 cmd->data->error = cmd->error;
891
892 if (cmd->data && cmd->data->stop && (!host->cmd_is_stop)) {
893 host->cmd_is_stop = 1;
894 s3cmci_send_request(host->mmc);
895 return;
896 }
897
898
899 if (!mrq->data)
900 goto request_done;
901
902
903 if (mrq->data->error == 0) {
904 mrq->data->bytes_xfered =
905 (mrq->data->blocks * mrq->data->blksz);
906 } else {
907 mrq->data->bytes_xfered = 0;
908 }
909
910
911
912 if (mrq->data->error != 0) {
913 if (s3cmci_host_usedma(host))
914 dmaengine_terminate_all(host->dma);
915
916 if (host->is2440) {
917
918 writel(S3C2440_SDIFSTA_FIFORESET |
919 S3C2440_SDIFSTA_FIFOFAIL,
920 host->base + S3C2410_SDIFSTA);
921 } else {
922 u32 mci_con;
923
924
925 mci_con = readl(host->base + S3C2410_SDICON);
926 mci_con |= S3C2410_SDICON_FIFORESET;
927
928 writel(mci_con, host->base + S3C2410_SDICON);
929 }
930 }
931
932request_done:
933 host->complete_what = COMPLETION_NONE;
934 host->mrq = NULL;
935
936 s3cmci_check_sdio_irq(host);
937 mmc_request_done(host->mmc, mrq);
938}
939
940static void s3cmci_send_command(struct s3cmci_host *host,
941 struct mmc_command *cmd)
942{
943 u32 ccon, imsk;
944
945 imsk = S3C2410_SDIIMSK_CRCSTATUS | S3C2410_SDIIMSK_CMDTIMEOUT |
946 S3C2410_SDIIMSK_RESPONSEND | S3C2410_SDIIMSK_CMDSENT |
947 S3C2410_SDIIMSK_RESPONSECRC;
948
949 enable_imask(host, imsk);
950
951 if (cmd->data)
952 host->complete_what = COMPLETION_XFERFINISH_RSPFIN;
953 else if (cmd->flags & MMC_RSP_PRESENT)
954 host->complete_what = COMPLETION_RSPFIN;
955 else
956 host->complete_what = COMPLETION_CMDSENT;
957
958 writel(cmd->arg, host->base + S3C2410_SDICMDARG);
959
960 ccon = cmd->opcode & S3C2410_SDICMDCON_INDEX;
961 ccon |= S3C2410_SDICMDCON_SENDERHOST | S3C2410_SDICMDCON_CMDSTART;
962
963 if (cmd->flags & MMC_RSP_PRESENT)
964 ccon |= S3C2410_SDICMDCON_WAITRSP;
965
966 if (cmd->flags & MMC_RSP_136)
967 ccon |= S3C2410_SDICMDCON_LONGRSP;
968
969 writel(ccon, host->base + S3C2410_SDICMDCON);
970}
971
972static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
973{
974 u32 dcon, imsk, stoptries = 3;
975
976
977
978 if (!data) {
979 writel(0, host->base + S3C2410_SDIDCON);
980 return 0;
981 }
982
983 if ((data->blksz & 3) != 0) {
984
985
986
987 if (data->blocks > 1) {
988 pr_warn("%s: can't do non-word sized block transfers (blksz %d)\n",
989 __func__, data->blksz);
990 return -EINVAL;
991 }
992 }
993
994 while (readl(host->base + S3C2410_SDIDSTA) &
995 (S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {
996
997 dbg(host, dbg_err,
998 "mci_setup_data() transfer stillin progress.\n");
999
1000 writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
1001 s3cmci_reset(host);
1002
1003 if ((stoptries--) == 0) {
1004 dbg_dumpregs(host, "DRF");
1005 return -EINVAL;
1006 }
1007 }
1008
1009 dcon = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
1010
1011 if (s3cmci_host_usedma(host))
1012 dcon |= S3C2410_SDIDCON_DMAEN;
1013
1014 if (host->bus_width == MMC_BUS_WIDTH_4)
1015 dcon |= S3C2410_SDIDCON_WIDEBUS;
1016
1017 if (!(data->flags & MMC_DATA_STREAM))
1018 dcon |= S3C2410_SDIDCON_BLOCKMODE;
1019
1020 if (data->flags & MMC_DATA_WRITE) {
1021 dcon |= S3C2410_SDIDCON_TXAFTERRESP;
1022 dcon |= S3C2410_SDIDCON_XFER_TXSTART;
1023 }
1024
1025 if (data->flags & MMC_DATA_READ) {
1026 dcon |= S3C2410_SDIDCON_RXAFTERCMD;
1027 dcon |= S3C2410_SDIDCON_XFER_RXSTART;
1028 }
1029
1030 if (host->is2440) {
1031 dcon |= S3C2440_SDIDCON_DS_WORD;
1032 dcon |= S3C2440_SDIDCON_DATSTART;
1033 }
1034
1035 writel(dcon, host->base + S3C2410_SDIDCON);
1036
1037
1038
1039 writel(data->blksz, host->base + S3C2410_SDIBSIZE);
1040
1041
1042 imsk = S3C2410_SDIIMSK_FIFOFAIL | S3C2410_SDIIMSK_DATACRC |
1043 S3C2410_SDIIMSK_DATATIMEOUT | S3C2410_SDIIMSK_DATAFINISH;
1044
1045 enable_imask(host, imsk);
1046
1047
1048
1049 if (host->is2440) {
1050 writel(0x007FFFFF, host->base + S3C2410_SDITIMER);
1051 } else {
1052 writel(0x0000FFFF, host->base + S3C2410_SDITIMER);
1053
1054
1055 if (data->flags & MMC_DATA_READ)
1056 writel(0xFF, host->base + S3C2410_SDIPRE);
1057 }
1058
1059 return 0;
1060}
1061
1062#define BOTH_DIR (MMC_DATA_WRITE | MMC_DATA_READ)
1063
1064static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
1065{
1066 int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
1067
1068 BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
1069
1070 host->pio_sgptr = 0;
1071 host->pio_bytes = 0;
1072 host->pio_count = 0;
1073 host->pio_active = rw ? XFER_WRITE : XFER_READ;
1074
1075 if (rw) {
1076 do_pio_write(host);
1077 enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
1078 } else {
1079 enable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF
1080 | S3C2410_SDIIMSK_RXFIFOLAST);
1081 }
1082
1083 return 0;
1084}
1085
1086static int s3cmci_prepare_dma(struct s3cmci_host *host, struct mmc_data *data)
1087{
1088 int rw = data->flags & MMC_DATA_WRITE;
1089 struct dma_async_tx_descriptor *desc;
1090 struct dma_slave_config conf = {
1091 .src_addr = host->mem->start + host->sdidata,
1092 .dst_addr = host->mem->start + host->sdidata,
1093 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
1094 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
1095 };
1096
1097 BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
1098
1099
1100 writel(host->prescaler, host->base + S3C2410_SDIPRE);
1101
1102 if (!rw)
1103 conf.direction = DMA_DEV_TO_MEM;
1104 else
1105 conf.direction = DMA_MEM_TO_DEV;
1106
1107 dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
1108 rw ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1109
1110 dmaengine_slave_config(host->dma, &conf);
1111 desc = dmaengine_prep_slave_sg(host->dma, data->sg, data->sg_len,
1112 conf.direction,
1113 DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
1114 if (!desc)
1115 goto unmap_exit;
1116 desc->callback = s3cmci_dma_done_callback;
1117 desc->callback_param = host;
1118 dmaengine_submit(desc);
1119 dma_async_issue_pending(host->dma);
1120
1121 return 0;
1122
1123unmap_exit:
1124 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
1125 rw ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1126 return -ENOMEM;
1127}
1128
1129static void s3cmci_send_request(struct mmc_host *mmc)
1130{
1131 struct s3cmci_host *host = mmc_priv(mmc);
1132 struct mmc_request *mrq = host->mrq;
1133 struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
1134
1135 host->ccnt++;
1136 prepare_dbgmsg(host, cmd, host->cmd_is_stop);
1137
1138
1139
1140
1141 writel(0xFFFFFFFF, host->base + S3C2410_SDICMDSTAT);
1142 writel(0xFFFFFFFF, host->base + S3C2410_SDIDSTA);
1143 writel(0xFFFFFFFF, host->base + S3C2410_SDIFSTA);
1144
1145 if (cmd->data) {
1146 int res = s3cmci_setup_data(host, cmd->data);
1147
1148 host->dcnt++;
1149
1150 if (res) {
1151 dbg(host, dbg_err, "setup data error %d\n", res);
1152 cmd->error = res;
1153 cmd->data->error = res;
1154
1155 mmc_request_done(mmc, mrq);
1156 return;
1157 }
1158
1159 if (s3cmci_host_usedma(host))
1160 res = s3cmci_prepare_dma(host, cmd->data);
1161 else
1162 res = s3cmci_prepare_pio(host, cmd->data);
1163
1164 if (res) {
1165 dbg(host, dbg_err, "data prepare error %d\n", res);
1166 cmd->error = res;
1167 cmd->data->error = res;
1168
1169 mmc_request_done(mmc, mrq);
1170 return;
1171 }
1172 }
1173
1174
1175 s3cmci_send_command(host, cmd);
1176
1177
1178 s3cmci_enable_irq(host, true);
1179}
1180
1181static int s3cmci_card_present(struct mmc_host *mmc)
1182{
1183 struct s3cmci_host *host = mmc_priv(mmc);
1184 struct s3c24xx_mci_pdata *pdata = host->pdata;
1185 int ret;
1186
1187 if (pdata->no_detect)
1188 return -ENOSYS;
1189
1190 ret = gpio_get_value(pdata->gpio_detect) ? 0 : 1;
1191 return ret ^ pdata->detect_invert;
1192}
1193
1194static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1195{
1196 struct s3cmci_host *host = mmc_priv(mmc);
1197
1198 host->status = "mmc request";
1199 host->cmd_is_stop = 0;
1200 host->mrq = mrq;
1201
1202 if (s3cmci_card_present(mmc) == 0) {
1203 dbg(host, dbg_err, "%s: no medium present\n", __func__);
1204 host->mrq->cmd->error = -ENOMEDIUM;
1205 mmc_request_done(mmc, mrq);
1206 } else
1207 s3cmci_send_request(mmc);
1208}
1209
1210static void s3cmci_set_clk(struct s3cmci_host *host, struct mmc_ios *ios)
1211{
1212 u32 mci_psc;
1213
1214
1215 for (mci_psc = 0; mci_psc < 255; mci_psc++) {
1216 host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
1217
1218 if (host->real_rate <= ios->clock)
1219 break;
1220 }
1221
1222 if (mci_psc > 255)
1223 mci_psc = 255;
1224
1225 host->prescaler = mci_psc;
1226 writel(host->prescaler, host->base + S3C2410_SDIPRE);
1227
1228
1229 if (ios->clock == 0)
1230 host->real_rate = 0;
1231}
1232
1233static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1234{
1235 struct s3cmci_host *host = mmc_priv(mmc);
1236 u32 mci_con;
1237
1238
1239
1240 mci_con = readl(host->base + S3C2410_SDICON);
1241
1242 switch (ios->power_mode) {
1243 case MMC_POWER_ON:
1244 case MMC_POWER_UP:
1245
1246 s3c_gpio_cfgall_range(S3C2410_GPE(5), 6, S3C_GPIO_SFN(2),
1247 S3C_GPIO_PULL_NONE);
1248
1249 if (host->pdata->set_power)
1250 host->pdata->set_power(ios->power_mode, ios->vdd);
1251
1252 if (!host->is2440)
1253 mci_con |= S3C2410_SDICON_FIFORESET;
1254
1255 break;
1256
1257 case MMC_POWER_OFF:
1258 default:
1259 gpio_direction_output(S3C2410_GPE(5), 0);
1260
1261 if (host->is2440)
1262 mci_con |= S3C2440_SDICON_SDRESET;
1263
1264 if (host->pdata->set_power)
1265 host->pdata->set_power(ios->power_mode, ios->vdd);
1266
1267 break;
1268 }
1269
1270 s3cmci_set_clk(host, ios);
1271
1272
1273 if (ios->clock)
1274 mci_con |= S3C2410_SDICON_CLOCKTYPE;
1275 else
1276 mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
1277
1278 writel(mci_con, host->base + S3C2410_SDICON);
1279
1280 if ((ios->power_mode == MMC_POWER_ON) ||
1281 (ios->power_mode == MMC_POWER_UP)) {
1282 dbg(host, dbg_conf, "running at %lukHz (requested: %ukHz).\n",
1283 host->real_rate/1000, ios->clock/1000);
1284 } else {
1285 dbg(host, dbg_conf, "powered down.\n");
1286 }
1287
1288 host->bus_width = ios->bus_width;
1289}
1290
1291static void s3cmci_reset(struct s3cmci_host *host)
1292{
1293 u32 con = readl(host->base + S3C2410_SDICON);
1294
1295 con |= S3C2440_SDICON_SDRESET;
1296 writel(con, host->base + S3C2410_SDICON);
1297}
1298
1299static int s3cmci_get_ro(struct mmc_host *mmc)
1300{
1301 struct s3cmci_host *host = mmc_priv(mmc);
1302 struct s3c24xx_mci_pdata *pdata = host->pdata;
1303 int ret;
1304
1305 if (pdata->no_wprotect)
1306 return 0;
1307
1308 ret = gpio_get_value(pdata->gpio_wprotect) ? 1 : 0;
1309 ret ^= pdata->wprotect_invert;
1310
1311 return ret;
1312}
1313
1314static void s3cmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1315{
1316 struct s3cmci_host *host = mmc_priv(mmc);
1317 unsigned long flags;
1318 u32 con;
1319
1320 local_irq_save(flags);
1321
1322 con = readl(host->base + S3C2410_SDICON);
1323 host->sdio_irqen = enable;
1324
1325 if (enable == host->sdio_irqen)
1326 goto same_state;
1327
1328 if (enable) {
1329 con |= S3C2410_SDICON_SDIOIRQ;
1330 enable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
1331
1332 if (!host->irq_state && !host->irq_disabled) {
1333 host->irq_state = true;
1334 enable_irq(host->irq);
1335 }
1336 } else {
1337 disable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
1338 con &= ~S3C2410_SDICON_SDIOIRQ;
1339
1340 if (!host->irq_enabled && host->irq_state) {
1341 disable_irq_nosync(host->irq);
1342 host->irq_state = false;
1343 }
1344 }
1345
1346 writel(con, host->base + S3C2410_SDICON);
1347
1348 same_state:
1349 local_irq_restore(flags);
1350
1351 s3cmci_check_sdio_irq(host);
1352}
1353
1354static struct mmc_host_ops s3cmci_ops = {
1355 .request = s3cmci_request,
1356 .set_ios = s3cmci_set_ios,
1357 .get_ro = s3cmci_get_ro,
1358 .get_cd = s3cmci_card_present,
1359 .enable_sdio_irq = s3cmci_enable_sdio_irq,
1360};
1361
1362static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
1363
1364
1365 .no_wprotect = 1,
1366 .no_detect = 1,
1367};
1368
1369#ifdef CONFIG_CPU_FREQ
1370
1371static int s3cmci_cpufreq_transition(struct notifier_block *nb,
1372 unsigned long val, void *data)
1373{
1374 struct s3cmci_host *host;
1375 struct mmc_host *mmc;
1376 unsigned long newclk;
1377 unsigned long flags;
1378
1379 host = container_of(nb, struct s3cmci_host, freq_transition);
1380 newclk = clk_get_rate(host->clk);
1381 mmc = host->mmc;
1382
1383 if ((val == CPUFREQ_PRECHANGE && newclk > host->clk_rate) ||
1384 (val == CPUFREQ_POSTCHANGE && newclk < host->clk_rate)) {
1385 spin_lock_irqsave(&mmc->lock, flags);
1386
1387 host->clk_rate = newclk;
1388
1389 if (mmc->ios.power_mode != MMC_POWER_OFF &&
1390 mmc->ios.clock != 0)
1391 s3cmci_set_clk(host, &mmc->ios);
1392
1393 spin_unlock_irqrestore(&mmc->lock, flags);
1394 }
1395
1396 return 0;
1397}
1398
1399static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1400{
1401 host->freq_transition.notifier_call = s3cmci_cpufreq_transition;
1402
1403 return cpufreq_register_notifier(&host->freq_transition,
1404 CPUFREQ_TRANSITION_NOTIFIER);
1405}
1406
1407static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1408{
1409 cpufreq_unregister_notifier(&host->freq_transition,
1410 CPUFREQ_TRANSITION_NOTIFIER);
1411}
1412
1413#else
1414static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1415{
1416 return 0;
1417}
1418
1419static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1420{
1421}
1422#endif
1423
1424
1425#ifdef CONFIG_DEBUG_FS
1426
1427static int s3cmci_state_show(struct seq_file *seq, void *v)
1428{
1429 struct s3cmci_host *host = seq->private;
1430
1431 seq_printf(seq, "Register base = 0x%08x\n", (u32)host->base);
1432 seq_printf(seq, "Clock rate = %ld\n", host->clk_rate);
1433 seq_printf(seq, "Prescale = %d\n", host->prescaler);
1434 seq_printf(seq, "is2440 = %d\n", host->is2440);
1435 seq_printf(seq, "IRQ = %d\n", host->irq);
1436 seq_printf(seq, "IRQ enabled = %d\n", host->irq_enabled);
1437 seq_printf(seq, "IRQ disabled = %d\n", host->irq_disabled);
1438 seq_printf(seq, "IRQ state = %d\n", host->irq_state);
1439 seq_printf(seq, "CD IRQ = %d\n", host->irq_cd);
1440 seq_printf(seq, "Do DMA = %d\n", s3cmci_host_usedma(host));
1441 seq_printf(seq, "SDIIMSK at %d\n", host->sdiimsk);
1442 seq_printf(seq, "SDIDATA at %d\n", host->sdidata);
1443
1444 return 0;
1445}
1446
1447static int s3cmci_state_open(struct inode *inode, struct file *file)
1448{
1449 return single_open(file, s3cmci_state_show, inode->i_private);
1450}
1451
1452static const struct file_operations s3cmci_fops_state = {
1453 .owner = THIS_MODULE,
1454 .open = s3cmci_state_open,
1455 .read = seq_read,
1456 .llseek = seq_lseek,
1457 .release = single_release,
1458};
1459
1460#define DBG_REG(_r) { .addr = S3C2410_SDI##_r, .name = #_r }
1461
1462struct s3cmci_reg {
1463 unsigned short addr;
1464 unsigned char *name;
1465} debug_regs[] = {
1466 DBG_REG(CON),
1467 DBG_REG(PRE),
1468 DBG_REG(CMDARG),
1469 DBG_REG(CMDCON),
1470 DBG_REG(CMDSTAT),
1471 DBG_REG(RSP0),
1472 DBG_REG(RSP1),
1473 DBG_REG(RSP2),
1474 DBG_REG(RSP3),
1475 DBG_REG(TIMER),
1476 DBG_REG(BSIZE),
1477 DBG_REG(DCON),
1478 DBG_REG(DCNT),
1479 DBG_REG(DSTA),
1480 DBG_REG(FSTA),
1481 {}
1482};
1483
1484static int s3cmci_regs_show(struct seq_file *seq, void *v)
1485{
1486 struct s3cmci_host *host = seq->private;
1487 struct s3cmci_reg *rptr = debug_regs;
1488
1489 for (; rptr->name; rptr++)
1490 seq_printf(seq, "SDI%s\t=0x%08x\n", rptr->name,
1491 readl(host->base + rptr->addr));
1492
1493 seq_printf(seq, "SDIIMSK\t=0x%08x\n", readl(host->base + host->sdiimsk));
1494
1495 return 0;
1496}
1497
1498static int s3cmci_regs_open(struct inode *inode, struct file *file)
1499{
1500 return single_open(file, s3cmci_regs_show, inode->i_private);
1501}
1502
1503static const struct file_operations s3cmci_fops_regs = {
1504 .owner = THIS_MODULE,
1505 .open = s3cmci_regs_open,
1506 .read = seq_read,
1507 .llseek = seq_lseek,
1508 .release = single_release,
1509};
1510
1511static void s3cmci_debugfs_attach(struct s3cmci_host *host)
1512{
1513 struct device *dev = &host->pdev->dev;
1514
1515 host->debug_root = debugfs_create_dir(dev_name(dev), NULL);
1516 if (IS_ERR(host->debug_root)) {
1517 dev_err(dev, "failed to create debugfs root\n");
1518 return;
1519 }
1520
1521 host->debug_state = debugfs_create_file("state", 0444,
1522 host->debug_root, host,
1523 &s3cmci_fops_state);
1524
1525 if (IS_ERR(host->debug_state))
1526 dev_err(dev, "failed to create debug state file\n");
1527
1528 host->debug_regs = debugfs_create_file("regs", 0444,
1529 host->debug_root, host,
1530 &s3cmci_fops_regs);
1531
1532 if (IS_ERR(host->debug_regs))
1533 dev_err(dev, "failed to create debug regs file\n");
1534}
1535
1536static void s3cmci_debugfs_remove(struct s3cmci_host *host)
1537{
1538 debugfs_remove(host->debug_regs);
1539 debugfs_remove(host->debug_state);
1540 debugfs_remove(host->debug_root);
1541}
1542
1543#else
1544static inline void s3cmci_debugfs_attach(struct s3cmci_host *host) { }
1545static inline void s3cmci_debugfs_remove(struct s3cmci_host *host) { }
1546
1547#endif
1548
1549static int s3cmci_probe(struct platform_device *pdev)
1550{
1551 struct s3cmci_host *host;
1552 struct mmc_host *mmc;
1553 int ret;
1554 int is2440;
1555 int i;
1556
1557 is2440 = platform_get_device_id(pdev)->driver_data;
1558
1559 mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
1560 if (!mmc) {
1561 ret = -ENOMEM;
1562 goto probe_out;
1563 }
1564
1565 for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++) {
1566 ret = gpio_request(i, dev_name(&pdev->dev));
1567 if (ret) {
1568 dev_err(&pdev->dev, "failed to get gpio %d\n", i);
1569
1570 for (i--; i >= S3C2410_GPE(5); i--)
1571 gpio_free(i);
1572
1573 goto probe_free_host;
1574 }
1575 }
1576
1577 host = mmc_priv(mmc);
1578 host->mmc = mmc;
1579 host->pdev = pdev;
1580 host->is2440 = is2440;
1581
1582 host->pdata = pdev->dev.platform_data;
1583 if (!host->pdata) {
1584 pdev->dev.platform_data = &s3cmci_def_pdata;
1585 host->pdata = &s3cmci_def_pdata;
1586 }
1587
1588 spin_lock_init(&host->complete_lock);
1589 tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
1590
1591 if (is2440) {
1592 host->sdiimsk = S3C2440_SDIIMSK;
1593 host->sdidata = S3C2440_SDIDATA;
1594 host->clk_div = 1;
1595 } else {
1596 host->sdiimsk = S3C2410_SDIIMSK;
1597 host->sdidata = S3C2410_SDIDATA;
1598 host->clk_div = 2;
1599 }
1600
1601 host->complete_what = COMPLETION_NONE;
1602 host->pio_active = XFER_NONE;
1603
1604 host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1605 if (!host->mem) {
1606 dev_err(&pdev->dev,
1607 "failed to get io memory region resource.\n");
1608
1609 ret = -ENOENT;
1610 goto probe_free_gpio;
1611 }
1612
1613 host->mem = request_mem_region(host->mem->start,
1614 resource_size(host->mem), pdev->name);
1615
1616 if (!host->mem) {
1617 dev_err(&pdev->dev, "failed to request io memory region.\n");
1618 ret = -ENOENT;
1619 goto probe_free_gpio;
1620 }
1621
1622 host->base = ioremap(host->mem->start, resource_size(host->mem));
1623 if (!host->base) {
1624 dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
1625 ret = -EINVAL;
1626 goto probe_free_mem_region;
1627 }
1628
1629 host->irq = platform_get_irq(pdev, 0);
1630 if (host->irq == 0) {
1631 dev_err(&pdev->dev, "failed to get interrupt resource.\n");
1632 ret = -EINVAL;
1633 goto probe_iounmap;
1634 }
1635
1636 if (request_irq(host->irq, s3cmci_irq, 0, DRIVER_NAME, host)) {
1637 dev_err(&pdev->dev, "failed to request mci interrupt.\n");
1638 ret = -ENOENT;
1639 goto probe_iounmap;
1640 }
1641
1642
1643
1644
1645
1646 disable_irq(host->irq);
1647 host->irq_state = false;
1648
1649 if (!host->pdata->no_detect) {
1650 ret = gpio_request(host->pdata->gpio_detect, "s3cmci detect");
1651 if (ret) {
1652 dev_err(&pdev->dev, "failed to get detect gpio\n");
1653 goto probe_free_irq;
1654 }
1655
1656 host->irq_cd = gpio_to_irq(host->pdata->gpio_detect);
1657
1658 if (host->irq_cd >= 0) {
1659 if (request_irq(host->irq_cd, s3cmci_irq_cd,
1660 IRQF_TRIGGER_RISING |
1661 IRQF_TRIGGER_FALLING,
1662 DRIVER_NAME, host)) {
1663 dev_err(&pdev->dev,
1664 "can't get card detect irq.\n");
1665 ret = -ENOENT;
1666 goto probe_free_gpio_cd;
1667 }
1668 } else {
1669 dev_warn(&pdev->dev,
1670 "host detect has no irq available\n");
1671 gpio_direction_input(host->pdata->gpio_detect);
1672 }
1673 } else
1674 host->irq_cd = -1;
1675
1676 if (!host->pdata->no_wprotect) {
1677 ret = gpio_request(host->pdata->gpio_wprotect, "s3cmci wp");
1678 if (ret) {
1679 dev_err(&pdev->dev, "failed to get writeprotect\n");
1680 goto probe_free_irq_cd;
1681 }
1682
1683 gpio_direction_input(host->pdata->gpio_wprotect);
1684 }
1685
1686
1687
1688 if (s3cmci_host_usedma(host)) {
1689 dma_cap_mask_t mask;
1690
1691 dma_cap_zero(mask);
1692 dma_cap_set(DMA_SLAVE, mask);
1693
1694 host->dma = dma_request_slave_channel_compat(mask,
1695 s3c24xx_dma_filter, (void *)DMACH_SDI, &pdev->dev, "rx-tx");
1696 if (!host->dma) {
1697 dev_err(&pdev->dev, "cannot get DMA channel.\n");
1698 ret = -EBUSY;
1699 goto probe_free_gpio_wp;
1700 }
1701 }
1702
1703 host->clk = clk_get(&pdev->dev, "sdi");
1704 if (IS_ERR(host->clk)) {
1705 dev_err(&pdev->dev, "failed to find clock source.\n");
1706 ret = PTR_ERR(host->clk);
1707 host->clk = NULL;
1708 goto probe_free_dma;
1709 }
1710
1711 ret = clk_prepare_enable(host->clk);
1712 if (ret) {
1713 dev_err(&pdev->dev, "failed to enable clock source.\n");
1714 goto clk_free;
1715 }
1716
1717 host->clk_rate = clk_get_rate(host->clk);
1718
1719 mmc->ops = &s3cmci_ops;
1720 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1721#ifdef CONFIG_MMC_S3C_HW_SDIO_IRQ
1722 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1723#else
1724 mmc->caps = MMC_CAP_4_BIT_DATA;
1725#endif
1726 mmc->f_min = host->clk_rate / (host->clk_div * 256);
1727 mmc->f_max = host->clk_rate / host->clk_div;
1728
1729 if (host->pdata->ocr_avail)
1730 mmc->ocr_avail = host->pdata->ocr_avail;
1731
1732 mmc->max_blk_count = 4095;
1733 mmc->max_blk_size = 4095;
1734 mmc->max_req_size = 4095 * 512;
1735 mmc->max_seg_size = mmc->max_req_size;
1736
1737 mmc->max_segs = 128;
1738
1739 dbg(host, dbg_debug,
1740 "probe: mode:%s mapped mci_base:%p irq:%u irq_cd:%u dma:%p.\n",
1741 (host->is2440?"2440":""),
1742 host->base, host->irq, host->irq_cd, host->dma);
1743
1744 ret = s3cmci_cpufreq_register(host);
1745 if (ret) {
1746 dev_err(&pdev->dev, "failed to register cpufreq\n");
1747 goto free_dmabuf;
1748 }
1749
1750 ret = mmc_add_host(mmc);
1751 if (ret) {
1752 dev_err(&pdev->dev, "failed to add mmc host.\n");
1753 goto free_cpufreq;
1754 }
1755
1756 s3cmci_debugfs_attach(host);
1757
1758 platform_set_drvdata(pdev, mmc);
1759 dev_info(&pdev->dev, "%s - using %s, %s SDIO IRQ\n", mmc_hostname(mmc),
1760 s3cmci_host_usedma(host) ? "dma" : "pio",
1761 mmc->caps & MMC_CAP_SDIO_IRQ ? "hw" : "sw");
1762
1763 return 0;
1764
1765 free_cpufreq:
1766 s3cmci_cpufreq_deregister(host);
1767
1768 free_dmabuf:
1769 clk_disable_unprepare(host->clk);
1770
1771 clk_free:
1772 clk_put(host->clk);
1773
1774 probe_free_dma:
1775 if (s3cmci_host_usedma(host))
1776 dma_release_channel(host->dma);
1777
1778 probe_free_gpio_wp:
1779 if (!host->pdata->no_wprotect)
1780 gpio_free(host->pdata->gpio_wprotect);
1781
1782 probe_free_gpio_cd:
1783 if (!host->pdata->no_detect)
1784 gpio_free(host->pdata->gpio_detect);
1785
1786 probe_free_irq_cd:
1787 if (host->irq_cd >= 0)
1788 free_irq(host->irq_cd, host);
1789
1790 probe_free_irq:
1791 free_irq(host->irq, host);
1792
1793 probe_iounmap:
1794 iounmap(host->base);
1795
1796 probe_free_mem_region:
1797 release_mem_region(host->mem->start, resource_size(host->mem));
1798
1799 probe_free_gpio:
1800 for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
1801 gpio_free(i);
1802
1803 probe_free_host:
1804 mmc_free_host(mmc);
1805
1806 probe_out:
1807 return ret;
1808}
1809
1810static void s3cmci_shutdown(struct platform_device *pdev)
1811{
1812 struct mmc_host *mmc = platform_get_drvdata(pdev);
1813 struct s3cmci_host *host = mmc_priv(mmc);
1814
1815 if (host->irq_cd >= 0)
1816 free_irq(host->irq_cd, host);
1817
1818 s3cmci_debugfs_remove(host);
1819 s3cmci_cpufreq_deregister(host);
1820 mmc_remove_host(mmc);
1821 clk_disable_unprepare(host->clk);
1822}
1823
1824static int s3cmci_remove(struct platform_device *pdev)
1825{
1826 struct mmc_host *mmc = platform_get_drvdata(pdev);
1827 struct s3cmci_host *host = mmc_priv(mmc);
1828 struct s3c24xx_mci_pdata *pd = host->pdata;
1829 int i;
1830
1831 s3cmci_shutdown(pdev);
1832
1833 clk_put(host->clk);
1834
1835 tasklet_disable(&host->pio_tasklet);
1836
1837 if (s3cmci_host_usedma(host))
1838 dma_release_channel(host->dma);
1839
1840 free_irq(host->irq, host);
1841
1842 if (!pd->no_wprotect)
1843 gpio_free(pd->gpio_wprotect);
1844
1845 if (!pd->no_detect)
1846 gpio_free(pd->gpio_detect);
1847
1848 for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
1849 gpio_free(i);
1850
1851
1852 iounmap(host->base);
1853 release_mem_region(host->mem->start, resource_size(host->mem));
1854
1855 mmc_free_host(mmc);
1856 return 0;
1857}
1858
1859static struct platform_device_id s3cmci_driver_ids[] = {
1860 {
1861 .name = "s3c2410-sdi",
1862 .driver_data = 0,
1863 }, {
1864 .name = "s3c2412-sdi",
1865 .driver_data = 1,
1866 }, {
1867 .name = "s3c2440-sdi",
1868 .driver_data = 1,
1869 },
1870 { }
1871};
1872
1873MODULE_DEVICE_TABLE(platform, s3cmci_driver_ids);
1874
1875static struct platform_driver s3cmci_driver = {
1876 .driver = {
1877 .name = "s3c-sdi",
1878 },
1879 .id_table = s3cmci_driver_ids,
1880 .probe = s3cmci_probe,
1881 .remove = s3cmci_remove,
1882 .shutdown = s3cmci_shutdown,
1883};
1884
1885module_platform_driver(s3cmci_driver);
1886
1887MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
1888MODULE_LICENSE("GPL v2");
1889MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>, Ben Dooks <ben-linux@fluff.org>");
1890
