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JBD: round commit timer up to avoid uncommitted transaction
[linux/fpc-iii.git] / drivers / mmc / host / s3cmci.c
blob8c08cd7efa7f1a9073e6a80bba0dc8696632b2ce
1 /*
2 * linux/drivers/mmc/s3cmci.h - Samsung S3C MCI driver
3 *
4 * Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk@maintech.de>
5 *
6 * Current driver maintained by Ben Dooks and Simtec Electronics
7 * Copyright (C) 2008 Simtec Electronics <ben-linux@fluff.org>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/module.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/clk.h>
17 #include <linux/mmc/host.h>
18 #include <linux/platform_device.h>
19 #include <linux/cpufreq.h>
20 #include <linux/gpio.h>
21 #include <linux/irq.h>
22 #include <linux/io.h>
23
24 #include <mach/dma.h>
25
26 #include <mach/regs-sdi.h>
27 #include <mach/regs-gpio.h>
28
29 #include <plat/mci.h>
30
31 #include "s3cmci.h"
32
33 #define DRIVER_NAME "s3c-mci"
34
35 enum dbg_channels {
36 dbg_err = (1 << 0),
37 dbg_debug = (1 << 1),
38 dbg_info = (1 << 2),
39 dbg_irq = (1 << 3),
40 dbg_sg = (1 << 4),
41 dbg_dma = (1 << 5),
42 dbg_pio = (1 << 6),
43 dbg_fail = (1 << 7),
44 dbg_conf = (1 << 8),
45 };
46
47 static const int dbgmap_err = dbg_fail;
48 static const int dbgmap_info = dbg_info | dbg_conf;
49 static const int dbgmap_debug = dbg_err | dbg_debug;
50
51 #define dbg(host, channels, args...) \
52 do { \
53 if (dbgmap_err & channels) \
54 dev_err(&host->pdev->dev, args); \
55 else if (dbgmap_info & channels) \
56 dev_info(&host->pdev->dev, args); \
57 else if (dbgmap_debug & channels) \
58 dev_dbg(&host->pdev->dev, args); \
59 } while (0)
60
61 #define RESSIZE(ressource) (((ressource)->end - (ressource)->start)+1)
62
63 static struct s3c2410_dma_client s3cmci_dma_client = {
64 .name = "s3c-mci",
65 };
66
67 static void finalize_request(struct s3cmci_host *host);
68 static void s3cmci_send_request(struct mmc_host *mmc);
69 static void s3cmci_reset(struct s3cmci_host *host);
70
71 #ifdef CONFIG_MMC_DEBUG
72
73 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix)
74 {
75 u32 con, pre, cmdarg, cmdcon, cmdsta, r0, r1, r2, r3, timer, bsize;
76 u32 datcon, datcnt, datsta, fsta, imask;
77
78 con = readl(host->base + S3C2410_SDICON);
79 pre = readl(host->base + S3C2410_SDIPRE);
80 cmdarg = readl(host->base + S3C2410_SDICMDARG);
81 cmdcon = readl(host->base + S3C2410_SDICMDCON);
82 cmdsta = readl(host->base + S3C2410_SDICMDSTAT);
83 r0 = readl(host->base + S3C2410_SDIRSP0);
84 r1 = readl(host->base + S3C2410_SDIRSP1);
85 r2 = readl(host->base + S3C2410_SDIRSP2);
86 r3 = readl(host->base + S3C2410_SDIRSP3);
87 timer = readl(host->base + S3C2410_SDITIMER);
88 bsize = readl(host->base + S3C2410_SDIBSIZE);
89 datcon = readl(host->base + S3C2410_SDIDCON);
90 datcnt = readl(host->base + S3C2410_SDIDCNT);
91 datsta = readl(host->base + S3C2410_SDIDSTA);
92 fsta = readl(host->base + S3C2410_SDIFSTA);
93 imask = readl(host->base + host->sdiimsk);
94
95 dbg(host, dbg_debug, "%s CON:[%08x] PRE:[%08x] TMR:[%08x]\n",
96 prefix, con, pre, timer);
97
98 dbg(host, dbg_debug, "%s CCON:[%08x] CARG:[%08x] CSTA:[%08x]\n",
99 prefix, cmdcon, cmdarg, cmdsta);
100
101 dbg(host, dbg_debug, "%s DCON:[%08x] FSTA:[%08x]"
102 " DSTA:[%08x] DCNT:[%08x]\n",
103 prefix, datcon, fsta, datsta, datcnt);
104
105 dbg(host, dbg_debug, "%s R0:[%08x] R1:[%08x]"
106 " R2:[%08x] R3:[%08x]\n",
107 prefix, r0, r1, r2, r3);
108 }
109
110 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
111 int stop)
112 {
113 snprintf(host->dbgmsg_cmd, 300,
114 "#%u%s op:%i arg:0x%08x flags:0x08%x retries:%u",
115 host->ccnt, (stop ? " (STOP)" : ""),
116 cmd->opcode, cmd->arg, cmd->flags, cmd->retries);
117
118 if (cmd->data) {
119 snprintf(host->dbgmsg_dat, 300,
120 "#%u bsize:%u blocks:%u bytes:%u",
121 host->dcnt, cmd->data->blksz,
122 cmd->data->blocks,
123 cmd->data->blocks * cmd->data->blksz);
124 } else {
125 host->dbgmsg_dat[0] = '\0';
126 }
127 }
128
129 static void dbg_dumpcmd(struct s3cmci_host *host, struct mmc_command *cmd,
130 int fail)
131 {
132 unsigned int dbglvl = fail ? dbg_fail : dbg_debug;
133
134 if (!cmd)
135 return;
136
137 if (cmd->error == 0) {
138 dbg(host, dbglvl, "CMD[OK] %s R0:0x%08x\n",
139 host->dbgmsg_cmd, cmd->resp[0]);
140 } else {
141 dbg(host, dbglvl, "CMD[ERR %i] %s Status:%s\n",
142 cmd->error, host->dbgmsg_cmd, host->status);
143 }
144
145 if (!cmd->data)
146 return;
147
148 if (cmd->data->error == 0) {
149 dbg(host, dbglvl, "DAT[OK] %s\n", host->dbgmsg_dat);
150 } else {
151 dbg(host, dbglvl, "DAT[ERR %i] %s DCNT:0x%08x\n",
152 cmd->data->error, host->dbgmsg_dat,
153 readl(host->base + S3C2410_SDIDCNT));
154 }
155 }
156 #else
157 static void dbg_dumpcmd(struct s3cmci_host *host,
158 struct mmc_command *cmd, int fail) { }
159
160 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
161 int stop) { }
162
163 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix) { }
164
165 #endif /* CONFIG_MMC_DEBUG */
166
167 static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
168 {
169 u32 newmask;
170
171 newmask = readl(host->base + host->sdiimsk);
172 newmask |= imask;
173
174 writel(newmask, host->base + host->sdiimsk);
175
176 return newmask;
177 }
178
179 static inline u32 disable_imask(struct s3cmci_host *host, u32 imask)
180 {
181 u32 newmask;
182
183 newmask = readl(host->base + host->sdiimsk);
184 newmask &= ~imask;
185
186 writel(newmask, host->base + host->sdiimsk);
187
188 return newmask;
189 }
190
191 static inline void clear_imask(struct s3cmci_host *host)
192 {
193 writel(0, host->base + host->sdiimsk);
194 }
195
196 static inline int get_data_buffer(struct s3cmci_host *host,
197 u32 *bytes, u32 **pointer)
198 {
199 struct scatterlist *sg;
200
201 if (host->pio_active == XFER_NONE)
202 return -EINVAL;
203
204 if ((!host->mrq) || (!host->mrq->data))
205 return -EINVAL;
206
207 if (host->pio_sgptr >= host->mrq->data->sg_len) {
208 dbg(host, dbg_debug, "no more buffers (%i/%i)\n",
209 host->pio_sgptr, host->mrq->data->sg_len);
210 return -EBUSY;
211 }
212 sg = &host->mrq->data->sg[host->pio_sgptr];
213
214 *bytes = sg->length;
215 *pointer = sg_virt(sg);
216
217 host->pio_sgptr++;
218
219 dbg(host, dbg_sg, "new buffer (%i/%i)\n",
220 host->pio_sgptr, host->mrq->data->sg_len);
221
222 return 0;
223 }
224
225 static inline u32 fifo_count(struct s3cmci_host *host)
226 {
227 u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
228
229 fifostat &= S3C2410_SDIFSTA_COUNTMASK;
230 return fifostat;
231 }
232
233 static inline u32 fifo_free(struct s3cmci_host *host)
234 {
235 u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
236
237 fifostat &= S3C2410_SDIFSTA_COUNTMASK;
238 return 63 - fifostat;
239 }
240
241 static void do_pio_read(struct s3cmci_host *host)
242 {
243 int res;
244 u32 fifo;
245 u32 *ptr;
246 u32 fifo_words;
247 void __iomem *from_ptr;
248
249 /* write real prescaler to host, it might be set slow to fix */
250 writel(host->prescaler, host->base + S3C2410_SDIPRE);
251
252 from_ptr = host->base + host->sdidata;
253
254 while ((fifo = fifo_count(host))) {
255 if (!host->pio_bytes) {
256 res = get_data_buffer(host, &host->pio_bytes,
257 &host->pio_ptr);
258 if (res) {
259 host->pio_active = XFER_NONE;
260 host->complete_what = COMPLETION_FINALIZE;
261
262 dbg(host, dbg_pio, "pio_read(): "
263 "complete (no more data).\n");
264 return;
265 }
266
267 dbg(host, dbg_pio,
268 "pio_read(): new target: [%i]@[%p]\n",
269 host->pio_bytes, host->pio_ptr);
270 }
271
272 dbg(host, dbg_pio,
273 "pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
274 fifo, host->pio_bytes,
275 readl(host->base + S3C2410_SDIDCNT));
276
277 /* If we have reached the end of the block, we can
278 * read a word and get 1 to 3 bytes. If we in the
279 * middle of the block, we have to read full words,
280 * otherwise we will write garbage, so round down to
281 * an even multiple of 4. */
282 if (fifo >= host->pio_bytes)
283 fifo = host->pio_bytes;
284 else
285 fifo -= fifo & 3;
286
287 host->pio_bytes -= fifo;
288 host->pio_count += fifo;
289
290 fifo_words = fifo >> 2;
291 ptr = host->pio_ptr;
292 while (fifo_words--)
293 *ptr++ = readl(from_ptr);
294 host->pio_ptr = ptr;
295
296 if (fifo & 3) {
297 u32 n = fifo & 3;
298 u32 data = readl(from_ptr);
299 u8 *p = (u8 *)host->pio_ptr;
300
301 while (n--) {
302 *p++ = data;
303 data >>= 8;
304 }
305 }
306 }
307
308 if (!host->pio_bytes) {
309 res = get_data_buffer(host, &host->pio_bytes, &host->pio_ptr);
310 if (res) {
311 dbg(host, dbg_pio,
312 "pio_read(): complete (no more buffers).\n");
313 host->pio_active = XFER_NONE;
314 host->complete_what = COMPLETION_FINALIZE;
315
316 return;
317 }
318 }
319
320 enable_imask(host,
321 S3C2410_SDIIMSK_RXFIFOHALF | S3C2410_SDIIMSK_RXFIFOLAST);
322 }
323
324 static void do_pio_write(struct s3cmci_host *host)
325 {
326 void __iomem *to_ptr;
327 int res;
328 u32 fifo;
329 u32 *ptr;
330
331 to_ptr = host->base + host->sdidata;
332
333 while ((fifo = fifo_free(host)) > 3) {
334 if (!host->pio_bytes) {
335 res = get_data_buffer(host, &host->pio_bytes,
336 &host->pio_ptr);
337 if (res) {
338 dbg(host, dbg_pio,
339 "pio_write(): complete (no more data).\n");
340 host->pio_active = XFER_NONE;
341
342 return;
343 }
344
345 dbg(host, dbg_pio,
346 "pio_write(): new source: [%i]@[%p]\n",
347 host->pio_bytes, host->pio_ptr);
348
349 }
350
351 /* If we have reached the end of the block, we have to
352 * write exactly the remaining number of bytes. If we
353 * in the middle of the block, we have to write full
354 * words, so round down to an even multiple of 4. */
355 if (fifo >= host->pio_bytes)
356 fifo = host->pio_bytes;
357 else
358 fifo -= fifo & 3;
359
360 host->pio_bytes -= fifo;
361 host->pio_count += fifo;
362
363 fifo = (fifo + 3) >> 2;
364 ptr = host->pio_ptr;
365 while (fifo--)
366 writel(*ptr++, to_ptr);
367 host->pio_ptr = ptr;
368 }
369
370 enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
371 }
372
373 static void pio_tasklet(unsigned long data)
374 {
375 struct s3cmci_host *host = (struct s3cmci_host *) data;
376
377
378 disable_irq(host->irq);
379
380 if (host->pio_active == XFER_WRITE)
381 do_pio_write(host);
382
383 if (host->pio_active == XFER_READ)
384 do_pio_read(host);
385
386 if (host->complete_what == COMPLETION_FINALIZE) {
387 clear_imask(host);
388 if (host->pio_active != XFER_NONE) {
389 dbg(host, dbg_err, "unfinished %s "
390 "- pio_count:[%u] pio_bytes:[%u]\n",
391 (host->pio_active == XFER_READ) ? "read" : "write",
392 host->pio_count, host->pio_bytes);
393
394 if (host->mrq->data)
395 host->mrq->data->error = -EINVAL;
396 }
397
398 finalize_request(host);
399 } else
400 enable_irq(host->irq);
401 }
402
403 /*
404 * ISR for SDI Interface IRQ
405 * Communication between driver and ISR works as follows:
406 * host->mrq points to current request
407 * host->complete_what Indicates when the request is considered done
408 * COMPLETION_CMDSENT when the command was sent
409 * COMPLETION_RSPFIN when a response was received
410 * COMPLETION_XFERFINISH when the data transfer is finished
411 * COMPLETION_XFERFINISH_RSPFIN both of the above.
412 * host->complete_request is the completion-object the driver waits for
413 *
414 * 1) Driver sets up host->mrq and host->complete_what
415 * 2) Driver prepares the transfer
416 * 3) Driver enables interrupts
417 * 4) Driver starts transfer
418 * 5) Driver waits for host->complete_rquest
419 * 6) ISR checks for request status (errors and success)
420 * 6) ISR sets host->mrq->cmd->error and host->mrq->data->error
421 * 7) ISR completes host->complete_request
422 * 8) ISR disables interrupts
423 * 9) Driver wakes up and takes care of the request
424 *
425 * Note: "->error"-fields are expected to be set to 0 before the request
426 * was issued by mmc.c - therefore they are only set, when an error
427 * contition comes up
428 */
429
430 static irqreturn_t s3cmci_irq(int irq, void *dev_id)
431 {
432 struct s3cmci_host *host = dev_id;
433 struct mmc_command *cmd;
434 u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
435 u32 mci_cclear, mci_dclear;
436 unsigned long iflags;
437
438 spin_lock_irqsave(&host->complete_lock, iflags);
439
440 mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
441 mci_dsta = readl(host->base + S3C2410_SDIDSTA);
442 mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
443 mci_fsta = readl(host->base + S3C2410_SDIFSTA);
444 mci_imsk = readl(host->base + host->sdiimsk);
445 mci_cclear = 0;
446 mci_dclear = 0;
447
448 if ((host->complete_what == COMPLETION_NONE) ||
449 (host->complete_what == COMPLETION_FINALIZE)) {
450 host->status = "nothing to complete";
451 clear_imask(host);
452 goto irq_out;
453 }
454
455 if (!host->mrq) {
456 host->status = "no active mrq";
457 clear_imask(host);
458 goto irq_out;
459 }
460
461 cmd = host->cmd_is_stop ? host->mrq->stop : host->mrq->cmd;
462
463 if (!cmd) {
464 host->status = "no active cmd";
465 clear_imask(host);
466 goto irq_out;
467 }
468
469 if (!host->dodma) {
470 if ((host->pio_active == XFER_WRITE) &&
471 (mci_fsta & S3C2410_SDIFSTA_TFDET)) {
472
473 disable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
474 tasklet_schedule(&host->pio_tasklet);
475 host->status = "pio tx";
476 }
477
478 if ((host->pio_active == XFER_READ) &&
479 (mci_fsta & S3C2410_SDIFSTA_RFDET)) {
480
481 disable_imask(host,
482 S3C2410_SDIIMSK_RXFIFOHALF |
483 S3C2410_SDIIMSK_RXFIFOLAST);
484
485 tasklet_schedule(&host->pio_tasklet);
486 host->status = "pio rx";
487 }
488 }
489
490 if (mci_csta & S3C2410_SDICMDSTAT_CMDTIMEOUT) {
491 dbg(host, dbg_err, "CMDSTAT: error CMDTIMEOUT\n");
492 cmd->error = -ETIMEDOUT;
493 host->status = "error: command timeout";
494 goto fail_transfer;
495 }
496
497 if (mci_csta & S3C2410_SDICMDSTAT_CMDSENT) {
498 if (host->complete_what == COMPLETION_CMDSENT) {
499 host->status = "ok: command sent";
500 goto close_transfer;
501 }
502
503 mci_cclear |= S3C2410_SDICMDSTAT_CMDSENT;
504 }
505
506 if (mci_csta & S3C2410_SDICMDSTAT_CRCFAIL) {
507 if (cmd->flags & MMC_RSP_CRC) {
508 if (host->mrq->cmd->flags & MMC_RSP_136) {
509 dbg(host, dbg_irq,
510 "fixup: ignore CRC fail with long rsp\n");
511 } else {
512 /* note, we used to fail the transfer
513 * here, but it seems that this is just
514 * the hardware getting it wrong.
515 *
516 * cmd->error = -EILSEQ;
517 * host->status = "error: bad command crc";
518 * goto fail_transfer;
519 */
520 }
521 }
522
523 mci_cclear |= S3C2410_SDICMDSTAT_CRCFAIL;
524 }
525
526 if (mci_csta & S3C2410_SDICMDSTAT_RSPFIN) {
527 if (host->complete_what == COMPLETION_RSPFIN) {
528 host->status = "ok: command response received";
529 goto close_transfer;
530 }
531
532 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
533 host->complete_what = COMPLETION_XFERFINISH;
534
535 mci_cclear |= S3C2410_SDICMDSTAT_RSPFIN;
536 }
537
538 /* errors handled after this point are only relevant
539 when a data transfer is in progress */
540
541 if (!cmd->data)
542 goto clear_status_bits;
543
544 /* Check for FIFO failure */
545 if (host->is2440) {
546 if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
547 dbg(host, dbg_err, "FIFO failure\n");
548 host->mrq->data->error = -EILSEQ;
549 host->status = "error: 2440 fifo failure";
550 goto fail_transfer;
551 }
552 } else {
553 if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
554 dbg(host, dbg_err, "FIFO failure\n");
555 cmd->data->error = -EILSEQ;
556 host->status = "error: fifo failure";
557 goto fail_transfer;
558 }
559 }
560
561 if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
562 dbg(host, dbg_err, "bad data crc (outgoing)\n");
563 cmd->data->error = -EILSEQ;
564 host->status = "error: bad data crc (outgoing)";
565 goto fail_transfer;
566 }
567
568 if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
569 dbg(host, dbg_err, "bad data crc (incoming)\n");
570 cmd->data->error = -EILSEQ;
571 host->status = "error: bad data crc (incoming)";
572 goto fail_transfer;
573 }
574
575 if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
576 dbg(host, dbg_err, "data timeout\n");
577 cmd->data->error = -ETIMEDOUT;
578 host->status = "error: data timeout";
579 goto fail_transfer;
580 }
581
582 if (mci_dsta & S3C2410_SDIDSTA_XFERFINISH) {
583 if (host->complete_what == COMPLETION_XFERFINISH) {
584 host->status = "ok: data transfer completed";
585 goto close_transfer;
586 }
587
588 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
589 host->complete_what = COMPLETION_RSPFIN;
590
591 mci_dclear |= S3C2410_SDIDSTA_XFERFINISH;
592 }
593
594 clear_status_bits:
595 writel(mci_cclear, host->base + S3C2410_SDICMDSTAT);
596 writel(mci_dclear, host->base + S3C2410_SDIDSTA);
597
598 goto irq_out;
599
600 fail_transfer:
601 host->pio_active = XFER_NONE;
602
603 close_transfer:
604 host->complete_what = COMPLETION_FINALIZE;
605
606 clear_imask(host);
607 tasklet_schedule(&host->pio_tasklet);
608
609 goto irq_out;
610
611 irq_out:
612 dbg(host, dbg_irq,
613 "csta:0x%08x dsta:0x%08x fsta:0x%08x dcnt:0x%08x status:%s.\n",
614 mci_csta, mci_dsta, mci_fsta, mci_dcnt, host->status);
615
616 spin_unlock_irqrestore(&host->complete_lock, iflags);
617 return IRQ_HANDLED;
618
619 }
620
621 /*
622 * ISR for the CardDetect Pin
623 */
624
625 static irqreturn_t s3cmci_irq_cd(int irq, void *dev_id)
626 {
627 struct s3cmci_host *host = (struct s3cmci_host *)dev_id;
628
629 dbg(host, dbg_irq, "card detect\n");
630
631 mmc_detect_change(host->mmc, msecs_to_jiffies(500));
632
633 return IRQ_HANDLED;
634 }
635
636 static void s3cmci_dma_done_callback(struct s3c2410_dma_chan *dma_ch,
637 void *buf_id, int size,
638 enum s3c2410_dma_buffresult result)
639 {
640 struct s3cmci_host *host = buf_id;
641 unsigned long iflags;
642 u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt;
643
644 mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
645 mci_dsta = readl(host->base + S3C2410_SDIDSTA);
646 mci_fsta = readl(host->base + S3C2410_SDIFSTA);
647 mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
648
649 BUG_ON(!host->mrq);
650 BUG_ON(!host->mrq->data);
651 BUG_ON(!host->dmatogo);
652
653 spin_lock_irqsave(&host->complete_lock, iflags);
654
655 if (result != S3C2410_RES_OK) {
656 dbg(host, dbg_fail, "DMA FAILED: csta=0x%08x dsta=0x%08x "
657 "fsta=0x%08x dcnt:0x%08x result:0x%08x toGo:%u\n",
658 mci_csta, mci_dsta, mci_fsta,
659 mci_dcnt, result, host->dmatogo);
660
661 goto fail_request;
662 }
663
664 host->dmatogo--;
665 if (host->dmatogo) {
666 dbg(host, dbg_dma, "DMA DONE Size:%i DSTA:[%08x] "
667 "DCNT:[%08x] toGo:%u\n",
668 size, mci_dsta, mci_dcnt, host->dmatogo);
669
670 goto out;
671 }
672
673 dbg(host, dbg_dma, "DMA FINISHED Size:%i DSTA:%08x DCNT:%08x\n",
674 size, mci_dsta, mci_dcnt);
675
676 host->complete_what = COMPLETION_FINALIZE;
677
678 out:
679 tasklet_schedule(&host->pio_tasklet);
680 spin_unlock_irqrestore(&host->complete_lock, iflags);
681 return;
682
683 fail_request:
684 host->mrq->data->error = -EINVAL;
685 host->complete_what = COMPLETION_FINALIZE;
686 writel(0, host->base + host->sdiimsk);
687 goto out;
688
689 }
690
691 static void finalize_request(struct s3cmci_host *host)
692 {
693 struct mmc_request *mrq = host->mrq;
694 struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
695 int debug_as_failure = 0;
696
697 if (host->complete_what != COMPLETION_FINALIZE)
698 return;
699
700 if (!mrq)
701 return;
702
703 if (cmd->data && (cmd->error == 0) &&
704 (cmd->data->error == 0)) {
705 if (host->dodma && (!host->dma_complete)) {
706 dbg(host, dbg_dma, "DMA Missing!\n");
707 return;
708 }
709 }
710
711 /* Read response from controller. */
712 cmd->resp[0] = readl(host->base + S3C2410_SDIRSP0);
713 cmd->resp[1] = readl(host->base + S3C2410_SDIRSP1);
714 cmd->resp[2] = readl(host->base + S3C2410_SDIRSP2);
715 cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3);
716
717 writel(host->prescaler, host->base + S3C2410_SDIPRE);
718
719 if (cmd->error)
720 debug_as_failure = 1;
721
722 if (cmd->data && cmd->data->error)
723 debug_as_failure = 1;
724
725 dbg_dumpcmd(host, cmd, debug_as_failure);
726
727 /* Cleanup controller */
728 writel(0, host->base + S3C2410_SDICMDARG);
729 writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
730 writel(0, host->base + S3C2410_SDICMDCON);
731 writel(0, host->base + host->sdiimsk);
732
733 if (cmd->data && cmd->error)
734 cmd->data->error = cmd->error;
735
736 if (cmd->data && cmd->data->stop && (!host->cmd_is_stop)) {
737 host->cmd_is_stop = 1;
738 s3cmci_send_request(host->mmc);
739 return;
740 }
741
742 /* If we have no data transfer we are finished here */
743 if (!mrq->data)
744 goto request_done;
745
746 /* Calulate the amout of bytes transfer if there was no error */
747 if (mrq->data->error == 0) {
748 mrq->data->bytes_xfered =
749 (mrq->data->blocks * mrq->data->blksz);
750 } else {
751 mrq->data->bytes_xfered = 0;
752 }
753
754 /* If we had an error while transfering data we flush the
755 * DMA channel and the fifo to clear out any garbage. */
756 if (mrq->data->error != 0) {
757 if (host->dodma)
758 s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
759
760 if (host->is2440) {
761 /* Clear failure register and reset fifo. */
762 writel(S3C2440_SDIFSTA_FIFORESET |
763 S3C2440_SDIFSTA_FIFOFAIL,
764 host->base + S3C2410_SDIFSTA);
765 } else {
766 u32 mci_con;
767
768 /* reset fifo */
769 mci_con = readl(host->base + S3C2410_SDICON);
770 mci_con |= S3C2410_SDICON_FIFORESET;
771
772 writel(mci_con, host->base + S3C2410_SDICON);
773 }
774 }
775
776 request_done:
777 host->complete_what = COMPLETION_NONE;
778 host->mrq = NULL;
779 mmc_request_done(host->mmc, mrq);
780 }
781
782 static void s3cmci_dma_setup(struct s3cmci_host *host,
783 enum s3c2410_dmasrc source)
784 {
785 static enum s3c2410_dmasrc last_source = -1;
786 static int setup_ok;
787
788 if (last_source == source)
789 return;
790
791 last_source = source;
792
793 s3c2410_dma_devconfig(host->dma, source,
794 host->mem->start + host->sdidata);
795
796 if (!setup_ok) {
797 s3c2410_dma_config(host->dma, 4);
798 s3c2410_dma_set_buffdone_fn(host->dma,
799 s3cmci_dma_done_callback);
800 s3c2410_dma_setflags(host->dma, S3C2410_DMAF_AUTOSTART);
801 setup_ok = 1;
802 }
803 }
804
805 static void s3cmci_send_command(struct s3cmci_host *host,
806 struct mmc_command *cmd)
807 {
808 u32 ccon, imsk;
809
810 imsk = S3C2410_SDIIMSK_CRCSTATUS | S3C2410_SDIIMSK_CMDTIMEOUT |
811 S3C2410_SDIIMSK_RESPONSEND | S3C2410_SDIIMSK_CMDSENT |
812 S3C2410_SDIIMSK_RESPONSECRC;
813
814 enable_imask(host, imsk);
815
816 if (cmd->data)
817 host->complete_what = COMPLETION_XFERFINISH_RSPFIN;
818 else if (cmd->flags & MMC_RSP_PRESENT)
819 host->complete_what = COMPLETION_RSPFIN;
820 else
821 host->complete_what = COMPLETION_CMDSENT;
822
823 writel(cmd->arg, host->base + S3C2410_SDICMDARG);
824
825 ccon = cmd->opcode & S3C2410_SDICMDCON_INDEX;
826 ccon |= S3C2410_SDICMDCON_SENDERHOST | S3C2410_SDICMDCON_CMDSTART;
827
828 if (cmd->flags & MMC_RSP_PRESENT)
829 ccon |= S3C2410_SDICMDCON_WAITRSP;
830
831 if (cmd->flags & MMC_RSP_136)
832 ccon |= S3C2410_SDICMDCON_LONGRSP;
833
834 writel(ccon, host->base + S3C2410_SDICMDCON);
835 }
836
837 static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
838 {
839 u32 dcon, imsk, stoptries = 3;
840
841 /* write DCON register */
842
843 if (!data) {
844 writel(0, host->base + S3C2410_SDIDCON);
845 return 0;
846 }
847
848 if ((data->blksz & 3) != 0) {
849 /* We cannot deal with unaligned blocks with more than
850 * one block being transfered. */
851
852 if (data->blocks > 1) {
853 pr_warning("%s: can't do non-word sized block transfers (blksz %d)\n", __func__, data->blksz);
854 return -EINVAL;
855 }
856 }
857
858 while (readl(host->base + S3C2410_SDIDSTA) &
859 (S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {
860
861 dbg(host, dbg_err,
862 "mci_setup_data() transfer stillin progress.\n");
863
864 writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
865 s3cmci_reset(host);
866
867 if ((stoptries--) == 0) {
868 dbg_dumpregs(host, "DRF");
869 return -EINVAL;
870 }
871 }
872
873 dcon = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
874
875 if (host->dodma)
876 dcon |= S3C2410_SDIDCON_DMAEN;
877
878 if (host->bus_width == MMC_BUS_WIDTH_4)
879 dcon |= S3C2410_SDIDCON_WIDEBUS;
880
881 if (!(data->flags & MMC_DATA_STREAM))
882 dcon |= S3C2410_SDIDCON_BLOCKMODE;
883
884 if (data->flags & MMC_DATA_WRITE) {
885 dcon |= S3C2410_SDIDCON_TXAFTERRESP;
886 dcon |= S3C2410_SDIDCON_XFER_TXSTART;
887 }
888
889 if (data->flags & MMC_DATA_READ) {
890 dcon |= S3C2410_SDIDCON_RXAFTERCMD;
891 dcon |= S3C2410_SDIDCON_XFER_RXSTART;
892 }
893
894 if (host->is2440) {
895 dcon |= S3C2440_SDIDCON_DS_WORD;
896 dcon |= S3C2440_SDIDCON_DATSTART;
897 }
898
899 writel(dcon, host->base + S3C2410_SDIDCON);
900
901 /* write BSIZE register */
902
903 writel(data->blksz, host->base + S3C2410_SDIBSIZE);
904
905 /* add to IMASK register */
906 imsk = S3C2410_SDIIMSK_FIFOFAIL | S3C2410_SDIIMSK_DATACRC |
907 S3C2410_SDIIMSK_DATATIMEOUT | S3C2410_SDIIMSK_DATAFINISH;
908
909 enable_imask(host, imsk);
910
911 /* write TIMER register */
912
913 if (host->is2440) {
914 writel(0x007FFFFF, host->base + S3C2410_SDITIMER);
915 } else {
916 writel(0x0000FFFF, host->base + S3C2410_SDITIMER);
917
918 /* FIX: set slow clock to prevent timeouts on read */
919 if (data->flags & MMC_DATA_READ)
920 writel(0xFF, host->base + S3C2410_SDIPRE);
921 }
922
923 return 0;
924 }
925
926 #define BOTH_DIR (MMC_DATA_WRITE | MMC_DATA_READ)
927
928 static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
929 {
930 int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
931
932 BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
933
934 host->pio_sgptr = 0;
935 host->pio_bytes = 0;
936 host->pio_count = 0;
937 host->pio_active = rw ? XFER_WRITE : XFER_READ;
938
939 if (rw) {
940 do_pio_write(host);
941 enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
942 } else {
943 enable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF
944 | S3C2410_SDIIMSK_RXFIFOLAST);
945 }
946
947 return 0;
948 }
949
950 static int s3cmci_prepare_dma(struct s3cmci_host *host, struct mmc_data *data)
951 {
952 int dma_len, i;
953 int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
954
955 BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
956
957 s3cmci_dma_setup(host, rw ? S3C2410_DMASRC_MEM : S3C2410_DMASRC_HW);
958 s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
959
960 dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
961 (rw) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
962
963 if (dma_len == 0)
964 return -ENOMEM;
965
966 host->dma_complete = 0;
967 host->dmatogo = dma_len;
968
969 for (i = 0; i < dma_len; i++) {
970 int res;
971
972 dbg(host, dbg_dma, "enqueue %i:%u@%u\n", i,
973 sg_dma_address(&data->sg[i]),
974 sg_dma_len(&data->sg[i]));
975
976 res = s3c2410_dma_enqueue(host->dma, (void *) host,
977 sg_dma_address(&data->sg[i]),
978 sg_dma_len(&data->sg[i]));
979
980 if (res) {
981 s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
982 return -EBUSY;
983 }
984 }
985
986 s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_START);
987
988 return 0;
989 }
990
991 static void s3cmci_send_request(struct mmc_host *mmc)
992 {
993 struct s3cmci_host *host = mmc_priv(mmc);
994 struct mmc_request *mrq = host->mrq;
995 struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
996
997 host->ccnt++;
998 prepare_dbgmsg(host, cmd, host->cmd_is_stop);
999
1000 /* Clear command, data and fifo status registers
1001 Fifo clear only necessary on 2440, but doesn't hurt on 2410
1002 */
1003 writel(0xFFFFFFFF, host->base + S3C2410_SDICMDSTAT);
1004 writel(0xFFFFFFFF, host->base + S3C2410_SDIDSTA);
1005 writel(0xFFFFFFFF, host->base + S3C2410_SDIFSTA);
1006
1007 if (cmd->data) {
1008 int res = s3cmci_setup_data(host, cmd->data);
1009
1010 host->dcnt++;
1011
1012 if (res) {
1013 dbg(host, dbg_err, "setup data error %d\n", res);
1014 cmd->error = res;
1015 cmd->data->error = res;
1016
1017 mmc_request_done(mmc, mrq);
1018 return;
1019 }
1020
1021 if (host->dodma)
1022 res = s3cmci_prepare_dma(host, cmd->data);
1023 else
1024 res = s3cmci_prepare_pio(host, cmd->data);
1025
1026 if (res) {
1027 dbg(host, dbg_err, "data prepare error %d\n", res);
1028 cmd->error = res;
1029 cmd->data->error = res;
1030
1031 mmc_request_done(mmc, mrq);
1032 return;
1033 }
1034 }
1035
1036 /* Send command */
1037 s3cmci_send_command(host, cmd);
1038
1039 /* Enable Interrupt */
1040 enable_irq(host->irq);
1041 }
1042
1043 static int s3cmci_card_present(struct mmc_host *mmc)
1044 {
1045 struct s3cmci_host *host = mmc_priv(mmc);
1046 struct s3c24xx_mci_pdata *pdata = host->pdata;
1047 int ret;
1048
1049 if (pdata->gpio_detect == 0)
1050 return -ENOSYS;
1051
1052 ret = s3c2410_gpio_getpin(pdata->gpio_detect) ? 0 : 1;
1053 return ret ^ pdata->detect_invert;
1054 }
1055
1056 static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1057 {
1058 struct s3cmci_host *host = mmc_priv(mmc);
1059
1060 host->status = "mmc request";
1061 host->cmd_is_stop = 0;
1062 host->mrq = mrq;
1063
1064 if (s3cmci_card_present(mmc) == 0) {
1065 dbg(host, dbg_err, "%s: no medium present\n", __func__);
1066 host->mrq->cmd->error = -ENOMEDIUM;
1067 mmc_request_done(mmc, mrq);
1068 } else
1069 s3cmci_send_request(mmc);
1070 }
1071
1072 static void s3cmci_set_clk(struct s3cmci_host *host, struct mmc_ios *ios)
1073 {
1074 u32 mci_psc;
1075
1076 /* Set clock */
1077 for (mci_psc = 0; mci_psc < 255; mci_psc++) {
1078 host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
1079
1080 if (host->real_rate <= ios->clock)
1081 break;
1082 }
1083
1084 if (mci_psc > 255)
1085 mci_psc = 255;
1086
1087 host->prescaler = mci_psc;
1088 writel(host->prescaler, host->base + S3C2410_SDIPRE);
1089
1090 /* If requested clock is 0, real_rate will be 0, too */
1091 if (ios->clock == 0)
1092 host->real_rate = 0;
1093 }
1094
1095 static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1096 {
1097 struct s3cmci_host *host = mmc_priv(mmc);
1098 u32 mci_con;
1099
1100 /* Set the power state */
1101
1102 mci_con = readl(host->base + S3C2410_SDICON);
1103
1104 switch (ios->power_mode) {
1105 case MMC_POWER_ON:
1106 case MMC_POWER_UP:
1107 s3c2410_gpio_cfgpin(S3C2410_GPE5, S3C2410_GPE5_SDCLK);
1108 s3c2410_gpio_cfgpin(S3C2410_GPE6, S3C2410_GPE6_SDCMD);
1109 s3c2410_gpio_cfgpin(S3C2410_GPE7, S3C2410_GPE7_SDDAT0);
1110 s3c2410_gpio_cfgpin(S3C2410_GPE8, S3C2410_GPE8_SDDAT1);
1111 s3c2410_gpio_cfgpin(S3C2410_GPE9, S3C2410_GPE9_SDDAT2);
1112 s3c2410_gpio_cfgpin(S3C2410_GPE10, S3C2410_GPE10_SDDAT3);
1113
1114 if (host->pdata->set_power)
1115 host->pdata->set_power(ios->power_mode, ios->vdd);
1116
1117 if (!host->is2440)
1118 mci_con |= S3C2410_SDICON_FIFORESET;
1119
1120 break;
1121
1122 case MMC_POWER_OFF:
1123 default:
1124 s3c2410_gpio_setpin(S3C2410_GPE5, 0);
1125 s3c2410_gpio_cfgpin(S3C2410_GPE5, S3C2410_GPIO_OUTPUT);
1126
1127 if (host->is2440)
1128 mci_con |= S3C2440_SDICON_SDRESET;
1129
1130 if (host->pdata->set_power)
1131 host->pdata->set_power(ios->power_mode, ios->vdd);
1132
1133 break;
1134 }
1135
1136 s3cmci_set_clk(host, ios);
1137
1138 /* Set CLOCK_ENABLE */
1139 if (ios->clock)
1140 mci_con |= S3C2410_SDICON_CLOCKTYPE;
1141 else
1142 mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
1143
1144 writel(mci_con, host->base + S3C2410_SDICON);
1145
1146 if ((ios->power_mode == MMC_POWER_ON) ||
1147 (ios->power_mode == MMC_POWER_UP)) {
1148 dbg(host, dbg_conf, "running at %lukHz (requested: %ukHz).\n",
1149 host->real_rate/1000, ios->clock/1000);
1150 } else {
1151 dbg(host, dbg_conf, "powered down.\n");
1152 }
1153
1154 host->bus_width = ios->bus_width;
1155 }
1156
1157 static void s3cmci_reset(struct s3cmci_host *host)
1158 {
1159 u32 con = readl(host->base + S3C2410_SDICON);
1160
1161 con |= S3C2440_SDICON_SDRESET;
1162 writel(con, host->base + S3C2410_SDICON);
1163 }
1164
1165 static int s3cmci_get_ro(struct mmc_host *mmc)
1166 {
1167 struct s3cmci_host *host = mmc_priv(mmc);
1168 struct s3c24xx_mci_pdata *pdata = host->pdata;
1169 int ret;
1170
1171 if (pdata->gpio_wprotect == 0)
1172 return 0;
1173
1174 ret = s3c2410_gpio_getpin(pdata->gpio_wprotect);
1175
1176 if (pdata->wprotect_invert)
1177 ret = !ret;
1178
1179 return ret;
1180 }
1181
1182 static struct mmc_host_ops s3cmci_ops = {
1183 .request = s3cmci_request,
1184 .set_ios = s3cmci_set_ios,
1185 .get_ro = s3cmci_get_ro,
1186 .get_cd = s3cmci_card_present,
1187 };
1188
1189 static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
1190 /* This is currently here to avoid a number of if (host->pdata)
1191 * checks. Any zero fields to ensure reaonable defaults are picked. */
1192 };
1193
1194 #ifdef CONFIG_CPU_FREQ
1195
1196 static int s3cmci_cpufreq_transition(struct notifier_block *nb,
1197 unsigned long val, void *data)
1198 {
1199 struct s3cmci_host *host;
1200 struct mmc_host *mmc;
1201 unsigned long newclk;
1202 unsigned long flags;
1203
1204 host = container_of(nb, struct s3cmci_host, freq_transition);
1205 newclk = clk_get_rate(host->clk);
1206 mmc = host->mmc;
1207
1208 if ((val == CPUFREQ_PRECHANGE && newclk > host->clk_rate) ||
1209 (val == CPUFREQ_POSTCHANGE && newclk < host->clk_rate)) {
1210 spin_lock_irqsave(&mmc->lock, flags);
1211
1212 host->clk_rate = newclk;
1213
1214 if (mmc->ios.power_mode != MMC_POWER_OFF &&
1215 mmc->ios.clock != 0)
1216 s3cmci_set_clk(host, &mmc->ios);
1217
1218 spin_unlock_irqrestore(&mmc->lock, flags);
1219 }
1220
1221 return 0;
1222 }
1223
1224 static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1225 {
1226 host->freq_transition.notifier_call = s3cmci_cpufreq_transition;
1227
1228 return cpufreq_register_notifier(&host->freq_transition,
1229 CPUFREQ_TRANSITION_NOTIFIER);
1230 }
1231
1232 static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1233 {
1234 cpufreq_unregister_notifier(&host->freq_transition,
1235 CPUFREQ_TRANSITION_NOTIFIER);
1236 }
1237
1238 #else
1239 static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1240 {
1241 return 0;
1242 }
1243
1244 static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1245 {
1246 }
1247 #endif
1248
1249 static int __devinit s3cmci_probe(struct platform_device *pdev, int is2440)
1250 {
1251 struct s3cmci_host *host;
1252 struct mmc_host *mmc;
1253 int ret;
1254
1255 mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
1256 if (!mmc) {
1257 ret = -ENOMEM;
1258 goto probe_out;
1259 }
1260
1261 host = mmc_priv(mmc);
1262 host->mmc = mmc;
1263 host->pdev = pdev;
1264 host->is2440 = is2440;
1265
1266 host->pdata = pdev->dev.platform_data;
1267 if (!host->pdata) {
1268 pdev->dev.platform_data = &s3cmci_def_pdata;
1269 host->pdata = &s3cmci_def_pdata;
1270 }
1271
1272 spin_lock_init(&host->complete_lock);
1273 tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
1274
1275 if (is2440) {
1276 host->sdiimsk = S3C2440_SDIIMSK;
1277 host->sdidata = S3C2440_SDIDATA;
1278 host->clk_div = 1;
1279 } else {
1280 host->sdiimsk = S3C2410_SDIIMSK;
1281 host->sdidata = S3C2410_SDIDATA;
1282 host->clk_div = 2;
1283 }
1284
1285 host->dodma = 0;
1286 host->complete_what = COMPLETION_NONE;
1287 host->pio_active = XFER_NONE;
1288
1289 host->dma = S3CMCI_DMA;
1290
1291 host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1292 if (!host->mem) {
1293 dev_err(&pdev->dev,
1294 "failed to get io memory region resouce.\n");
1295
1296 ret = -ENOENT;
1297 goto probe_free_host;
1298 }
1299
1300 host->mem = request_mem_region(host->mem->start,
1301 RESSIZE(host->mem), pdev->name);
1302
1303 if (!host->mem) {
1304 dev_err(&pdev->dev, "failed to request io memory region.\n");
1305 ret = -ENOENT;
1306 goto probe_free_host;
1307 }
1308
1309 host->base = ioremap(host->mem->start, RESSIZE(host->mem));
1310 if (!host->base) {
1311 dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
1312 ret = -EINVAL;
1313 goto probe_free_mem_region;
1314 }
1315
1316 host->irq = platform_get_irq(pdev, 0);
1317 if (host->irq == 0) {
1318 dev_err(&pdev->dev, "failed to get interrupt resouce.\n");
1319 ret = -EINVAL;
1320 goto probe_iounmap;
1321 }
1322
1323 if (request_irq(host->irq, s3cmci_irq, 0, DRIVER_NAME, host)) {
1324 dev_err(&pdev->dev, "failed to request mci interrupt.\n");
1325 ret = -ENOENT;
1326 goto probe_iounmap;
1327 }
1328
1329 /* We get spurious interrupts even when we have set the IMSK
1330 * register to ignore everything, so use disable_irq() to make
1331 * ensure we don't lock the system with un-serviceable requests. */
1332
1333 disable_irq(host->irq);
1334
1335 host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
1336
1337 if (host->irq_cd >= 0) {
1338 if (request_irq(host->irq_cd, s3cmci_irq_cd,
1339 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
1340 DRIVER_NAME, host)) {
1341 dev_err(&pdev->dev, "can't get card detect irq.\n");
1342 ret = -ENOENT;
1343 goto probe_free_irq;
1344 }
1345 } else {
1346 dev_warn(&pdev->dev, "host detect has no irq available\n");
1347 s3c2410_gpio_cfgpin(host->pdata->gpio_detect,
1348 S3C2410_GPIO_INPUT);
1349 }
1350
1351 if (host->pdata->gpio_wprotect)
1352 s3c2410_gpio_cfgpin(host->pdata->gpio_wprotect,
1353 S3C2410_GPIO_INPUT);
1354
1355 if (s3c2410_dma_request(S3CMCI_DMA, &s3cmci_dma_client, NULL) < 0) {
1356 dev_err(&pdev->dev, "unable to get DMA channel.\n");
1357 ret = -EBUSY;
1358 goto probe_free_irq_cd;
1359 }
1360
1361 host->clk = clk_get(&pdev->dev, "sdi");
1362 if (IS_ERR(host->clk)) {
1363 dev_err(&pdev->dev, "failed to find clock source.\n");
1364 ret = PTR_ERR(host->clk);
1365 host->clk = NULL;
1366 goto probe_free_host;
1367 }
1368
1369 ret = clk_enable(host->clk);
1370 if (ret) {
1371 dev_err(&pdev->dev, "failed to enable clock source.\n");
1372 goto clk_free;
1373 }
1374
1375 host->clk_rate = clk_get_rate(host->clk);
1376
1377 mmc->ops = &s3cmci_ops;
1378 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1379 mmc->caps = MMC_CAP_4_BIT_DATA;
1380 mmc->f_min = host->clk_rate / (host->clk_div * 256);
1381 mmc->f_max = host->clk_rate / host->clk_div;
1382
1383 if (host->pdata->ocr_avail)
1384 mmc->ocr_avail = host->pdata->ocr_avail;
1385
1386 mmc->max_blk_count = 4095;
1387 mmc->max_blk_size = 4095;
1388 mmc->max_req_size = 4095 * 512;
1389 mmc->max_seg_size = mmc->max_req_size;
1390
1391 mmc->max_phys_segs = 128;
1392 mmc->max_hw_segs = 128;
1393
1394 dbg(host, dbg_debug,
1395 "probe: mode:%s mapped mci_base:%p irq:%u irq_cd:%u dma:%u.\n",
1396 (host->is2440?"2440":""),
1397 host->base, host->irq, host->irq_cd, host->dma);
1398
1399 ret = s3cmci_cpufreq_register(host);
1400 if (ret) {
1401 dev_err(&pdev->dev, "failed to register cpufreq\n");
1402 goto free_dmabuf;
1403 }
1404
1405 ret = mmc_add_host(mmc);
1406 if (ret) {
1407 dev_err(&pdev->dev, "failed to add mmc host.\n");
1408 goto free_cpufreq;
1409 }
1410
1411 platform_set_drvdata(pdev, mmc);
1412 dev_info(&pdev->dev, "initialisation done.\n");
1413
1414 return 0;
1415
1416 free_cpufreq:
1417 s3cmci_cpufreq_deregister(host);
1418
1419 free_dmabuf:
1420 clk_disable(host->clk);
1421
1422 clk_free:
1423 clk_put(host->clk);
1424
1425 probe_free_irq_cd:
1426 if (host->irq_cd >= 0)
1427 free_irq(host->irq_cd, host);
1428
1429 probe_free_irq:
1430 free_irq(host->irq, host);
1431
1432 probe_iounmap:
1433 iounmap(host->base);
1434
1435 probe_free_mem_region:
1436 release_mem_region(host->mem->start, RESSIZE(host->mem));
1437
1438 probe_free_host:
1439 mmc_free_host(mmc);
1440 probe_out:
1441 return ret;
1442 }
1443
1444 static void s3cmci_shutdown(struct platform_device *pdev)
1445 {
1446 struct mmc_host *mmc = platform_get_drvdata(pdev);
1447 struct s3cmci_host *host = mmc_priv(mmc);
1448
1449 if (host->irq_cd >= 0)
1450 free_irq(host->irq_cd, host);
1451
1452 s3cmci_cpufreq_deregister(host);
1453 mmc_remove_host(mmc);
1454 clk_disable(host->clk);
1455 }
1456
1457 static int __devexit s3cmci_remove(struct platform_device *pdev)
1458 {
1459 struct mmc_host *mmc = platform_get_drvdata(pdev);
1460 struct s3cmci_host *host = mmc_priv(mmc);
1461
1462 s3cmci_shutdown(pdev);
1463
1464 clk_put(host->clk);
1465
1466 tasklet_disable(&host->pio_tasklet);
1467 s3c2410_dma_free(S3CMCI_DMA, &s3cmci_dma_client);
1468
1469 free_irq(host->irq, host);
1470
1471 iounmap(host->base);
1472 release_mem_region(host->mem->start, RESSIZE(host->mem));
1473
1474 mmc_free_host(mmc);
1475 return 0;
1476 }
1477
1478 static int __devinit s3cmci_2410_probe(struct platform_device *dev)
1479 {
1480 return s3cmci_probe(dev, 0);
1481 }
1482
1483 static int __devinit s3cmci_2412_probe(struct platform_device *dev)
1484 {
1485 return s3cmci_probe(dev, 1);
1486 }
1487
1488 static int __devinit s3cmci_2440_probe(struct platform_device *dev)
1489 {
1490 return s3cmci_probe(dev, 1);
1491 }
1492
1493 #ifdef CONFIG_PM
1494
1495 static int s3cmci_suspend(struct platform_device *dev, pm_message_t state)
1496 {
1497 struct mmc_host *mmc = platform_get_drvdata(dev);
1498
1499 return mmc_suspend_host(mmc, state);
1500 }
1501
1502 static int s3cmci_resume(struct platform_device *dev)
1503 {
1504 struct mmc_host *mmc = platform_get_drvdata(dev);
1505
1506 return mmc_resume_host(mmc);
1507 }
1508
1509 #else /* CONFIG_PM */
1510 #define s3cmci_suspend NULL
1511 #define s3cmci_resume NULL
1512 #endif /* CONFIG_PM */
1513
1514
1515 static struct platform_driver s3cmci_2410_driver = {
1516 .driver.name = "s3c2410-sdi",
1517 .driver.owner = THIS_MODULE,
1518 .probe = s3cmci_2410_probe,
1519 .remove = __devexit_p(s3cmci_remove),
1520 .shutdown = s3cmci_shutdown,
1521 .suspend = s3cmci_suspend,
1522 .resume = s3cmci_resume,
1523 };
1524
1525 static struct platform_driver s3cmci_2412_driver = {
1526 .driver.name = "s3c2412-sdi",
1527 .driver.owner = THIS_MODULE,
1528 .probe = s3cmci_2412_probe,
1529 .remove = __devexit_p(s3cmci_remove),
1530 .shutdown = s3cmci_shutdown,
1531 .suspend = s3cmci_suspend,
1532 .resume = s3cmci_resume,
1533 };
1534
1535 static struct platform_driver s3cmci_2440_driver = {
1536 .driver.name = "s3c2440-sdi",
1537 .driver.owner = THIS_MODULE,
1538 .probe = s3cmci_2440_probe,
1539 .remove = __devexit_p(s3cmci_remove),
1540 .shutdown = s3cmci_shutdown,
1541 .suspend = s3cmci_suspend,
1542 .resume = s3cmci_resume,
1543 };
1544
1545
1546 static int __init s3cmci_init(void)
1547 {
1548 platform_driver_register(&s3cmci_2410_driver);
1549 platform_driver_register(&s3cmci_2412_driver);
1550 platform_driver_register(&s3cmci_2440_driver);
1551 return 0;
1552 }
1553
1554 static void __exit s3cmci_exit(void)
1555 {
1556 platform_driver_unregister(&s3cmci_2410_driver);
1557 platform_driver_unregister(&s3cmci_2412_driver);
1558 platform_driver_unregister(&s3cmci_2440_driver);
1559 }
1560
1561 module_init(s3cmci_init);
1562 module_exit(s3cmci_exit);
1563
1564 MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
1565 MODULE_LICENSE("GPL v2");
1566 MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>, Ben Dooks <ben-linux@fluff.org>");
1567 MODULE_ALIAS("platform:s3c2410-sdi");
1568 MODULE_ALIAS("platform:s3c2412-sdi");
1569 MODULE_ALIAS("platform:s3c2440-sdi");
Linux with added FPC-III support