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[mirror_ubuntu-artful-kernel.git] / drivers / mmc / host / s3cmci.c
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/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/mmc-s3cmci.h>
32
33 #include "s3cmci.h"
34
35 #define DRIVER_NAME "s3c-mci"
36
37 #define S3C2410_SDICON (0x00)
38 #define S3C2410_SDIPRE (0x04)
39 #define S3C2410_SDICMDARG (0x08)
40 #define S3C2410_SDICMDCON (0x0C)
41 #define S3C2410_SDICMDSTAT (0x10)
42 #define S3C2410_SDIRSP0 (0x14)
43 #define S3C2410_SDIRSP1 (0x18)
44 #define S3C2410_SDIRSP2 (0x1C)
45 #define S3C2410_SDIRSP3 (0x20)
46 #define S3C2410_SDITIMER (0x24)
47 #define S3C2410_SDIBSIZE (0x28)
48 #define S3C2410_SDIDCON (0x2C)
49 #define S3C2410_SDIDCNT (0x30)
50 #define S3C2410_SDIDSTA (0x34)
51 #define S3C2410_SDIFSTA (0x38)
52
53 #define S3C2410_SDIDATA (0x3C)
54 #define S3C2410_SDIIMSK (0x40)
55
56 #define S3C2440_SDIDATA (0x40)
57 #define S3C2440_SDIIMSK (0x3C)
58
59 #define S3C2440_SDICON_SDRESET (1 << 8)
60 #define S3C2410_SDICON_SDIOIRQ (1 << 3)
61 #define S3C2410_SDICON_FIFORESET (1 << 1)
62 #define S3C2410_SDICON_CLOCKTYPE (1 << 0)
63
64 #define S3C2410_SDICMDCON_LONGRSP (1 << 10)
65 #define S3C2410_SDICMDCON_WAITRSP (1 << 9)
66 #define S3C2410_SDICMDCON_CMDSTART (1 << 8)
67 #define S3C2410_SDICMDCON_SENDERHOST (1 << 6)
68 #define S3C2410_SDICMDCON_INDEX (0x3f)
69
70 #define S3C2410_SDICMDSTAT_CRCFAIL (1 << 12)
71 #define S3C2410_SDICMDSTAT_CMDSENT (1 << 11)
72 #define S3C2410_SDICMDSTAT_CMDTIMEOUT (1 << 10)
73 #define S3C2410_SDICMDSTAT_RSPFIN (1 << 9)
74
75 #define S3C2440_SDIDCON_DS_WORD (2 << 22)
76 #define S3C2410_SDIDCON_TXAFTERRESP (1 << 20)
77 #define S3C2410_SDIDCON_RXAFTERCMD (1 << 19)
78 #define S3C2410_SDIDCON_BLOCKMODE (1 << 17)
79 #define S3C2410_SDIDCON_WIDEBUS (1 << 16)
80 #define S3C2410_SDIDCON_DMAEN (1 << 15)
81 #define S3C2410_SDIDCON_STOP (1 << 14)
82 #define S3C2440_SDIDCON_DATSTART (1 << 14)
83
84 #define S3C2410_SDIDCON_XFER_RXSTART (2 << 12)
85 #define S3C2410_SDIDCON_XFER_TXSTART (3 << 12)
86
87 #define S3C2410_SDIDCON_BLKNUM_MASK (0xFFF)
88
89 #define S3C2410_SDIDSTA_SDIOIRQDETECT (1 << 9)
90 #define S3C2410_SDIDSTA_FIFOFAIL (1 << 8)
91 #define S3C2410_SDIDSTA_CRCFAIL (1 << 7)
92 #define S3C2410_SDIDSTA_RXCRCFAIL (1 << 6)
93 #define S3C2410_SDIDSTA_DATATIMEOUT (1 << 5)
94 #define S3C2410_SDIDSTA_XFERFINISH (1 << 4)
95 #define S3C2410_SDIDSTA_TXDATAON (1 << 1)
96 #define S3C2410_SDIDSTA_RXDATAON (1 << 0)
97
98 #define S3C2440_SDIFSTA_FIFORESET (1 << 16)
99 #define S3C2440_SDIFSTA_FIFOFAIL (3 << 14)
100 #define S3C2410_SDIFSTA_TFDET (1 << 13)
101 #define S3C2410_SDIFSTA_RFDET (1 << 12)
102 #define S3C2410_SDIFSTA_COUNTMASK (0x7f)
103
104 #define S3C2410_SDIIMSK_RESPONSECRC (1 << 17)
105 #define S3C2410_SDIIMSK_CMDSENT (1 << 16)
106 #define S3C2410_SDIIMSK_CMDTIMEOUT (1 << 15)
107 #define S3C2410_SDIIMSK_RESPONSEND (1 << 14)
108 #define S3C2410_SDIIMSK_SDIOIRQ (1 << 12)
109 #define S3C2410_SDIIMSK_FIFOFAIL (1 << 11)
110 #define S3C2410_SDIIMSK_CRCSTATUS (1 << 10)
111 #define S3C2410_SDIIMSK_DATACRC (1 << 9)
112 #define S3C2410_SDIIMSK_DATATIMEOUT (1 << 8)
113 #define S3C2410_SDIIMSK_DATAFINISH (1 << 7)
114 #define S3C2410_SDIIMSK_TXFIFOHALF (1 << 4)
115 #define S3C2410_SDIIMSK_RXFIFOLAST (1 << 2)
116 #define S3C2410_SDIIMSK_RXFIFOHALF (1 << 0)
117
118 enum dbg_channels {
119 dbg_err = (1 << 0),
120 dbg_debug = (1 << 1),
121 dbg_info = (1 << 2),
122 dbg_irq = (1 << 3),
123 dbg_sg = (1 << 4),
124 dbg_dma = (1 << 5),
125 dbg_pio = (1 << 6),
126 dbg_fail = (1 << 7),
127 dbg_conf = (1 << 8),
128 };
129
130 static const int dbgmap_err = dbg_fail;
131 static const int dbgmap_info = dbg_info | dbg_conf;
132 static const int dbgmap_debug = dbg_err | dbg_debug;
133
134 #define dbg(host, channels, args...) \
135 do { \
136 if (dbgmap_err & channels) \
137 dev_err(&host->pdev->dev, args); \
138 else if (dbgmap_info & channels) \
139 dev_info(&host->pdev->dev, args); \
140 else if (dbgmap_debug & channels) \
141 dev_dbg(&host->pdev->dev, args); \
142 } while (0)
143
144 static void finalize_request(struct s3cmci_host *host);
145 static void s3cmci_send_request(struct mmc_host *mmc);
146 static void s3cmci_reset(struct s3cmci_host *host);
147
148 #ifdef CONFIG_MMC_DEBUG
149
150 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix)
151 {
152 u32 con, pre, cmdarg, cmdcon, cmdsta, r0, r1, r2, r3, timer, bsize;
153 u32 datcon, datcnt, datsta, fsta, imask;
154
155 con = readl(host->base + S3C2410_SDICON);
156 pre = readl(host->base + S3C2410_SDIPRE);
157 cmdarg = readl(host->base + S3C2410_SDICMDARG);
158 cmdcon = readl(host->base + S3C2410_SDICMDCON);
159 cmdsta = readl(host->base + S3C2410_SDICMDSTAT);
160 r0 = readl(host->base + S3C2410_SDIRSP0);
161 r1 = readl(host->base + S3C2410_SDIRSP1);
162 r2 = readl(host->base + S3C2410_SDIRSP2);
163 r3 = readl(host->base + S3C2410_SDIRSP3);
164 timer = readl(host->base + S3C2410_SDITIMER);
165 bsize = readl(host->base + S3C2410_SDIBSIZE);
166 datcon = readl(host->base + S3C2410_SDIDCON);
167 datcnt = readl(host->base + S3C2410_SDIDCNT);
168 datsta = readl(host->base + S3C2410_SDIDSTA);
169 fsta = readl(host->base + S3C2410_SDIFSTA);
170 imask = readl(host->base + host->sdiimsk);
171
172 dbg(host, dbg_debug, "%s CON:[%08x] PRE:[%08x] TMR:[%08x]\n",
173 prefix, con, pre, timer);
174
175 dbg(host, dbg_debug, "%s CCON:[%08x] CARG:[%08x] CSTA:[%08x]\n",
176 prefix, cmdcon, cmdarg, cmdsta);
177
178 dbg(host, dbg_debug, "%s DCON:[%08x] FSTA:[%08x]"
179 " DSTA:[%08x] DCNT:[%08x]\n",
180 prefix, datcon, fsta, datsta, datcnt);
181
182 dbg(host, dbg_debug, "%s R0:[%08x] R1:[%08x]"
183 " R2:[%08x] R3:[%08x]\n",
184 prefix, r0, r1, r2, r3);
185 }
186
187 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
188 int stop)
189 {
190 snprintf(host->dbgmsg_cmd, 300,
191 "#%u%s op:%i arg:0x%08x flags:0x08%x retries:%u",
192 host->ccnt, (stop ? " (STOP)" : ""),
193 cmd->opcode, cmd->arg, cmd->flags, cmd->retries);
194
195 if (cmd->data) {
196 snprintf(host->dbgmsg_dat, 300,
197 "#%u bsize:%u blocks:%u bytes:%u",
198 host->dcnt, cmd->data->blksz,
199 cmd->data->blocks,
200 cmd->data->blocks * cmd->data->blksz);
201 } else {
202 host->dbgmsg_dat[0] = '\0';
203 }
204 }
205
206 static void dbg_dumpcmd(struct s3cmci_host *host, struct mmc_command *cmd,
207 int fail)
208 {
209 unsigned int dbglvl = fail ? dbg_fail : dbg_debug;
210
211 if (!cmd)
212 return;
213
214 if (cmd->error == 0) {
215 dbg(host, dbglvl, "CMD[OK] %s R0:0x%08x\n",
216 host->dbgmsg_cmd, cmd->resp[0]);
217 } else {
218 dbg(host, dbglvl, "CMD[ERR %i] %s Status:%s\n",
219 cmd->error, host->dbgmsg_cmd, host->status);
220 }
221
222 if (!cmd->data)
223 return;
224
225 if (cmd->data->error == 0) {
226 dbg(host, dbglvl, "DAT[OK] %s\n", host->dbgmsg_dat);
227 } else {
228 dbg(host, dbglvl, "DAT[ERR %i] %s DCNT:0x%08x\n",
229 cmd->data->error, host->dbgmsg_dat,
230 readl(host->base + S3C2410_SDIDCNT));
231 }
232 }
233 #else
234 static void dbg_dumpcmd(struct s3cmci_host *host,
235 struct mmc_command *cmd, int fail) { }
236
237 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
238 int stop) { }
239
240 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix) { }
241
242 #endif /* CONFIG_MMC_DEBUG */
243
244 /**
245 * s3cmci_host_usedma - return whether the host is using dma or pio
246 * @host: The host state
247 *
248 * Return true if the host is using DMA to transfer data, else false
249 * to use PIO mode. Will return static data depending on the driver
250 * configuration.
251 */
252 static inline bool s3cmci_host_usedma(struct s3cmci_host *host)
253 {
254 #ifdef CONFIG_MMC_S3C_PIO
255 return false;
256 #else /* CONFIG_MMC_S3C_DMA */
257 return true;
258 #endif
259 }
260
261 static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
262 {
263 u32 newmask;
264
265 newmask = readl(host->base + host->sdiimsk);
266 newmask |= imask;
267
268 writel(newmask, host->base + host->sdiimsk);
269
270 return newmask;
271 }
272
273 static inline u32 disable_imask(struct s3cmci_host *host, u32 imask)
274 {
275 u32 newmask;
276
277 newmask = readl(host->base + host->sdiimsk);
278 newmask &= ~imask;
279
280 writel(newmask, host->base + host->sdiimsk);
281
282 return newmask;
283 }
284
285 static inline void clear_imask(struct s3cmci_host *host)
286 {
287 u32 mask = readl(host->base + host->sdiimsk);
288
289 /* preserve the SDIO IRQ mask state */
290 mask &= S3C2410_SDIIMSK_SDIOIRQ;
291 writel(mask, host->base + host->sdiimsk);
292 }
293
294 /**
295 * s3cmci_check_sdio_irq - test whether the SDIO IRQ is being signalled
296 * @host: The host to check.
297 *
298 * Test to see if the SDIO interrupt is being signalled in case the
299 * controller has failed to re-detect a card interrupt. Read GPE8 and
300 * see if it is low and if so, signal a SDIO interrupt.
301 *
302 * This is currently called if a request is finished (we assume that the
303 * bus is now idle) and when the SDIO IRQ is enabled in case the IRQ is
304 * already being indicated.
305 */
306 static void s3cmci_check_sdio_irq(struct s3cmci_host *host)
307 {
308 if (host->sdio_irqen) {
309 if (gpio_get_value(S3C2410_GPE(8)) == 0) {
310 pr_debug("%s: signalling irq\n", __func__);
311 mmc_signal_sdio_irq(host->mmc);
312 }
313 }
314 }
315
316 static inline int get_data_buffer(struct s3cmci_host *host,
317 u32 *bytes, u32 **pointer)
318 {
319 struct scatterlist *sg;
320
321 if (host->pio_active == XFER_NONE)
322 return -EINVAL;
323
324 if ((!host->mrq) || (!host->mrq->data))
325 return -EINVAL;
326
327 if (host->pio_sgptr >= host->mrq->data->sg_len) {
328 dbg(host, dbg_debug, "no more buffers (%i/%i)\n",
329 host->pio_sgptr, host->mrq->data->sg_len);
330 return -EBUSY;
331 }
332 sg = &host->mrq->data->sg[host->pio_sgptr];
333
334 *bytes = sg->length;
335 *pointer = sg_virt(sg);
336
337 host->pio_sgptr++;
338
339 dbg(host, dbg_sg, "new buffer (%i/%i)\n",
340 host->pio_sgptr, host->mrq->data->sg_len);
341
342 return 0;
343 }
344
345 static inline u32 fifo_count(struct s3cmci_host *host)
346 {
347 u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
348
349 fifostat &= S3C2410_SDIFSTA_COUNTMASK;
350 return fifostat;
351 }
352
353 static inline u32 fifo_free(struct s3cmci_host *host)
354 {
355 u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
356
357 fifostat &= S3C2410_SDIFSTA_COUNTMASK;
358 return 63 - fifostat;
359 }
360
361 /**
362 * s3cmci_enable_irq - enable IRQ, after having disabled it.
363 * @host: The device state.
364 * @more: True if more IRQs are expected from transfer.
365 *
366 * Enable the main IRQ if needed after it has been disabled.
367 *
368 * The IRQ can be one of the following states:
369 * - disabled during IDLE
370 * - disabled whilst processing data
371 * - enabled during transfer
372 * - enabled whilst awaiting SDIO interrupt detection
373 */
374 static void s3cmci_enable_irq(struct s3cmci_host *host, bool more)
375 {
376 unsigned long flags;
377 bool enable = false;
378
379 local_irq_save(flags);
380
381 host->irq_enabled = more;
382 host->irq_disabled = false;
383
384 enable = more | host->sdio_irqen;
385
386 if (host->irq_state != enable) {
387 host->irq_state = enable;
388
389 if (enable)
390 enable_irq(host->irq);
391 else
392 disable_irq(host->irq);
393 }
394
395 local_irq_restore(flags);
396 }
397
398 /**
399 *
400 */
401 static void s3cmci_disable_irq(struct s3cmci_host *host, bool transfer)
402 {
403 unsigned long flags;
404
405 local_irq_save(flags);
406
407 /* pr_debug("%s: transfer %d\n", __func__, transfer); */
408
409 host->irq_disabled = transfer;
410
411 if (transfer && host->irq_state) {
412 host->irq_state = false;
413 disable_irq(host->irq);
414 }
415
416 local_irq_restore(flags);
417 }
418
419 static void do_pio_read(struct s3cmci_host *host)
420 {
421 int res;
422 u32 fifo;
423 u32 *ptr;
424 u32 fifo_words;
425 void __iomem *from_ptr;
426
427 /* write real prescaler to host, it might be set slow to fix */
428 writel(host->prescaler, host->base + S3C2410_SDIPRE);
429
430 from_ptr = host->base + host->sdidata;
431
432 while ((fifo = fifo_count(host))) {
433 if (!host->pio_bytes) {
434 res = get_data_buffer(host, &host->pio_bytes,
435 &host->pio_ptr);
436 if (res) {
437 host->pio_active = XFER_NONE;
438 host->complete_what = COMPLETION_FINALIZE;
439
440 dbg(host, dbg_pio, "pio_read(): "
441 "complete (no more data).\n");
442 return;
443 }
444
445 dbg(host, dbg_pio,
446 "pio_read(): new target: [%i]@[%p]\n",
447 host->pio_bytes, host->pio_ptr);
448 }
449
450 dbg(host, dbg_pio,
451 "pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
452 fifo, host->pio_bytes,
453 readl(host->base + S3C2410_SDIDCNT));
454
455 /* If we have reached the end of the block, we can
456 * read a word and get 1 to 3 bytes. If we in the
457 * middle of the block, we have to read full words,
458 * otherwise we will write garbage, so round down to
459 * an even multiple of 4. */
460 if (fifo >= host->pio_bytes)
461 fifo = host->pio_bytes;
462 else
463 fifo -= fifo & 3;
464
465 host->pio_bytes -= fifo;
466 host->pio_count += fifo;
467
468 fifo_words = fifo >> 2;
469 ptr = host->pio_ptr;
470 while (fifo_words--)
471 *ptr++ = readl(from_ptr);
472 host->pio_ptr = ptr;
473
474 if (fifo & 3) {
475 u32 n = fifo & 3;
476 u32 data = readl(from_ptr);
477 u8 *p = (u8 *)host->pio_ptr;
478
479 while (n--) {
480 *p++ = data;
481 data >>= 8;
482 }
483 }
484 }
485
486 if (!host->pio_bytes) {
487 res = get_data_buffer(host, &host->pio_bytes, &host->pio_ptr);
488 if (res) {
489 dbg(host, dbg_pio,
490 "pio_read(): complete (no more buffers).\n");
491 host->pio_active = XFER_NONE;
492 host->complete_what = COMPLETION_FINALIZE;
493
494 return;
495 }
496 }
497
498 enable_imask(host,
499 S3C2410_SDIIMSK_RXFIFOHALF | S3C2410_SDIIMSK_RXFIFOLAST);
500 }
501
502 static void do_pio_write(struct s3cmci_host *host)
503 {
504 void __iomem *to_ptr;
505 int res;
506 u32 fifo;
507 u32 *ptr;
508
509 to_ptr = host->base + host->sdidata;
510
511 while ((fifo = fifo_free(host)) > 3) {
512 if (!host->pio_bytes) {
513 res = get_data_buffer(host, &host->pio_bytes,
514 &host->pio_ptr);
515 if (res) {
516 dbg(host, dbg_pio,
517 "pio_write(): complete (no more data).\n");
518 host->pio_active = XFER_NONE;
519
520 return;
521 }
522
523 dbg(host, dbg_pio,
524 "pio_write(): new source: [%i]@[%p]\n",
525 host->pio_bytes, host->pio_ptr);
526
527 }
528
529 /* If we have reached the end of the block, we have to
530 * write exactly the remaining number of bytes. If we
531 * in the middle of the block, we have to write full
532 * words, so round down to an even multiple of 4. */
533 if (fifo >= host->pio_bytes)
534 fifo = host->pio_bytes;
535 else
536 fifo -= fifo & 3;
537
538 host->pio_bytes -= fifo;
539 host->pio_count += fifo;
540
541 fifo = (fifo + 3) >> 2;
542 ptr = host->pio_ptr;
543 while (fifo--)
544 writel(*ptr++, to_ptr);
545 host->pio_ptr = ptr;
546 }
547
548 enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
549 }
550
551 static void pio_tasklet(unsigned long data)
552 {
553 struct s3cmci_host *host = (struct s3cmci_host *) data;
554
555 s3cmci_disable_irq(host, true);
556
557 if (host->pio_active == XFER_WRITE)
558 do_pio_write(host);
559
560 if (host->pio_active == XFER_READ)
561 do_pio_read(host);
562
563 if (host->complete_what == COMPLETION_FINALIZE) {
564 clear_imask(host);
565 if (host->pio_active != XFER_NONE) {
566 dbg(host, dbg_err, "unfinished %s "
567 "- pio_count:[%u] pio_bytes:[%u]\n",
568 (host->pio_active == XFER_READ) ? "read" : "write",
569 host->pio_count, host->pio_bytes);
570
571 if (host->mrq->data)
572 host->mrq->data->error = -EINVAL;
573 }
574
575 s3cmci_enable_irq(host, false);
576 finalize_request(host);
577 } else
578 s3cmci_enable_irq(host, true);
579 }
580
581 /*
582 * ISR for SDI Interface IRQ
583 * Communication between driver and ISR works as follows:
584 * host->mrq points to current request
585 * host->complete_what Indicates when the request is considered done
586 * COMPLETION_CMDSENT when the command was sent
587 * COMPLETION_RSPFIN when a response was received
588 * COMPLETION_XFERFINISH when the data transfer is finished
589 * COMPLETION_XFERFINISH_RSPFIN both of the above.
590 * host->complete_request is the completion-object the driver waits for
591 *
592 * 1) Driver sets up host->mrq and host->complete_what
593 * 2) Driver prepares the transfer
594 * 3) Driver enables interrupts
595 * 4) Driver starts transfer
596 * 5) Driver waits for host->complete_rquest
597 * 6) ISR checks for request status (errors and success)
598 * 6) ISR sets host->mrq->cmd->error and host->mrq->data->error
599 * 7) ISR completes host->complete_request
600 * 8) ISR disables interrupts
601 * 9) Driver wakes up and takes care of the request
602 *
603 * Note: "->error"-fields are expected to be set to 0 before the request
604 * was issued by mmc.c - therefore they are only set, when an error
605 * contition comes up
606 */
607
608 static irqreturn_t s3cmci_irq(int irq, void *dev_id)
609 {
610 struct s3cmci_host *host = dev_id;
611 struct mmc_command *cmd;
612 u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
613 u32 mci_cclear = 0, mci_dclear;
614 unsigned long iflags;
615
616 mci_dsta = readl(host->base + S3C2410_SDIDSTA);
617 mci_imsk = readl(host->base + host->sdiimsk);
618
619 if (mci_dsta & S3C2410_SDIDSTA_SDIOIRQDETECT) {
620 if (mci_imsk & S3C2410_SDIIMSK_SDIOIRQ) {
621 mci_dclear = S3C2410_SDIDSTA_SDIOIRQDETECT;
622 writel(mci_dclear, host->base + S3C2410_SDIDSTA);
623
624 mmc_signal_sdio_irq(host->mmc);
625 return IRQ_HANDLED;
626 }
627 }
628
629 spin_lock_irqsave(&host->complete_lock, iflags);
630
631 mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
632 mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
633 mci_fsta = readl(host->base + S3C2410_SDIFSTA);
634 mci_dclear = 0;
635
636 if ((host->complete_what == COMPLETION_NONE) ||
637 (host->complete_what == COMPLETION_FINALIZE)) {
638 host->status = "nothing to complete";
639 clear_imask(host);
640 goto irq_out;
641 }
642
643 if (!host->mrq) {
644 host->status = "no active mrq";
645 clear_imask(host);
646 goto irq_out;
647 }
648
649 cmd = host->cmd_is_stop ? host->mrq->stop : host->mrq->cmd;
650
651 if (!cmd) {
652 host->status = "no active cmd";
653 clear_imask(host);
654 goto irq_out;
655 }
656
657 if (!s3cmci_host_usedma(host)) {
658 if ((host->pio_active == XFER_WRITE) &&
659 (mci_fsta & S3C2410_SDIFSTA_TFDET)) {
660
661 disable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
662 tasklet_schedule(&host->pio_tasklet);
663 host->status = "pio tx";
664 }
665
666 if ((host->pio_active == XFER_READ) &&
667 (mci_fsta & S3C2410_SDIFSTA_RFDET)) {
668
669 disable_imask(host,
670 S3C2410_SDIIMSK_RXFIFOHALF |
671 S3C2410_SDIIMSK_RXFIFOLAST);
672
673 tasklet_schedule(&host->pio_tasklet);
674 host->status = "pio rx";
675 }
676 }
677
678 if (mci_csta & S3C2410_SDICMDSTAT_CMDTIMEOUT) {
679 dbg(host, dbg_err, "CMDSTAT: error CMDTIMEOUT\n");
680 cmd->error = -ETIMEDOUT;
681 host->status = "error: command timeout";
682 goto fail_transfer;
683 }
684
685 if (mci_csta & S3C2410_SDICMDSTAT_CMDSENT) {
686 if (host->complete_what == COMPLETION_CMDSENT) {
687 host->status = "ok: command sent";
688 goto close_transfer;
689 }
690
691 mci_cclear |= S3C2410_SDICMDSTAT_CMDSENT;
692 }
693
694 if (mci_csta & S3C2410_SDICMDSTAT_CRCFAIL) {
695 if (cmd->flags & MMC_RSP_CRC) {
696 if (host->mrq->cmd->flags & MMC_RSP_136) {
697 dbg(host, dbg_irq,
698 "fixup: ignore CRC fail with long rsp\n");
699 } else {
700 /* note, we used to fail the transfer
701 * here, but it seems that this is just
702 * the hardware getting it wrong.
703 *
704 * cmd->error = -EILSEQ;
705 * host->status = "error: bad command crc";
706 * goto fail_transfer;
707 */
708 }
709 }
710
711 mci_cclear |= S3C2410_SDICMDSTAT_CRCFAIL;
712 }
713
714 if (mci_csta & S3C2410_SDICMDSTAT_RSPFIN) {
715 if (host->complete_what == COMPLETION_RSPFIN) {
716 host->status = "ok: command response received";
717 goto close_transfer;
718 }
719
720 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
721 host->complete_what = COMPLETION_XFERFINISH;
722
723 mci_cclear |= S3C2410_SDICMDSTAT_RSPFIN;
724 }
725
726 /* errors handled after this point are only relevant
727 when a data transfer is in progress */
728
729 if (!cmd->data)
730 goto clear_status_bits;
731
732 /* Check for FIFO failure */
733 if (host->is2440) {
734 if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
735 dbg(host, dbg_err, "FIFO failure\n");
736 host->mrq->data->error = -EILSEQ;
737 host->status = "error: 2440 fifo failure";
738 goto fail_transfer;
739 }
740 } else {
741 if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
742 dbg(host, dbg_err, "FIFO failure\n");
743 cmd->data->error = -EILSEQ;
744 host->status = "error: fifo failure";
745 goto fail_transfer;
746 }
747 }
748
749 if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
750 dbg(host, dbg_err, "bad data crc (outgoing)\n");
751 cmd->data->error = -EILSEQ;
752 host->status = "error: bad data crc (outgoing)";
753 goto fail_transfer;
754 }
755
756 if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
757 dbg(host, dbg_err, "bad data crc (incoming)\n");
758 cmd->data->error = -EILSEQ;
759 host->status = "error: bad data crc (incoming)";
760 goto fail_transfer;
761 }
762
763 if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
764 dbg(host, dbg_err, "data timeout\n");
765 cmd->data->error = -ETIMEDOUT;
766 host->status = "error: data timeout";
767 goto fail_transfer;
768 }
769
770 if (mci_dsta & S3C2410_SDIDSTA_XFERFINISH) {
771 if (host->complete_what == COMPLETION_XFERFINISH) {
772 host->status = "ok: data transfer completed";
773 goto close_transfer;
774 }
775
776 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
777 host->complete_what = COMPLETION_RSPFIN;
778
779 mci_dclear |= S3C2410_SDIDSTA_XFERFINISH;
780 }
781
782 clear_status_bits:
783 writel(mci_cclear, host->base + S3C2410_SDICMDSTAT);
784 writel(mci_dclear, host->base + S3C2410_SDIDSTA);
785
786 goto irq_out;
787
788 fail_transfer:
789 host->pio_active = XFER_NONE;
790
791 close_transfer:
792 host->complete_what = COMPLETION_FINALIZE;
793
794 clear_imask(host);
795 tasklet_schedule(&host->pio_tasklet);
796
797 goto irq_out;
798
799 irq_out:
800 dbg(host, dbg_irq,
801 "csta:0x%08x dsta:0x%08x fsta:0x%08x dcnt:0x%08x status:%s.\n",
802 mci_csta, mci_dsta, mci_fsta, mci_dcnt, host->status);
803
804 spin_unlock_irqrestore(&host->complete_lock, iflags);
805 return IRQ_HANDLED;
806
807 }
808
809 /*
810 * ISR for the CardDetect Pin
811 */
812
813 static irqreturn_t s3cmci_irq_cd(int irq, void *dev_id)
814 {
815 struct s3cmci_host *host = (struct s3cmci_host *)dev_id;
816
817 dbg(host, dbg_irq, "card detect\n");
818
819 mmc_detect_change(host->mmc, msecs_to_jiffies(500));
820
821 return IRQ_HANDLED;
822 }
823
824 static void s3cmci_dma_done_callback(void *arg)
825 {
826 struct s3cmci_host *host = arg;
827 unsigned long iflags;
828
829 BUG_ON(!host->mrq);
830 BUG_ON(!host->mrq->data);
831
832 spin_lock_irqsave(&host->complete_lock, iflags);
833
834 dbg(host, dbg_dma, "DMA FINISHED\n");
835
836 host->dma_complete = 1;
837 host->complete_what = COMPLETION_FINALIZE;
838
839 tasklet_schedule(&host->pio_tasklet);
840 spin_unlock_irqrestore(&host->complete_lock, iflags);
841
842 }
843
844 static void finalize_request(struct s3cmci_host *host)
845 {
846 struct mmc_request *mrq = host->mrq;
847 struct mmc_command *cmd;
848 int debug_as_failure = 0;
849
850 if (host->complete_what != COMPLETION_FINALIZE)
851 return;
852
853 if (!mrq)
854 return;
855 cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
856
857 if (cmd->data && (cmd->error == 0) &&
858 (cmd->data->error == 0)) {
859 if (s3cmci_host_usedma(host) && (!host->dma_complete)) {
860 dbg(host, dbg_dma, "DMA Missing (%d)!\n",
861 host->dma_complete);
862 return;
863 }
864 }
865
866 /* Read response from controller. */
867 cmd->resp[0] = readl(host->base + S3C2410_SDIRSP0);
868 cmd->resp[1] = readl(host->base + S3C2410_SDIRSP1);
869 cmd->resp[2] = readl(host->base + S3C2410_SDIRSP2);
870 cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3);
871
872 writel(host->prescaler, host->base + S3C2410_SDIPRE);
873
874 if (cmd->error)
875 debug_as_failure = 1;
876
877 if (cmd->data && cmd->data->error)
878 debug_as_failure = 1;
879
880 dbg_dumpcmd(host, cmd, debug_as_failure);
881
882 /* Cleanup controller */
883 writel(0, host->base + S3C2410_SDICMDARG);
884 writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
885 writel(0, host->base + S3C2410_SDICMDCON);
886 clear_imask(host);
887
888 if (cmd->data && cmd->error)
889 cmd->data->error = cmd->error;
890
891 if (cmd->data && cmd->data->stop && (!host->cmd_is_stop)) {
892 host->cmd_is_stop = 1;
893 s3cmci_send_request(host->mmc);
894 return;
895 }
896
897 /* If we have no data transfer we are finished here */
898 if (!mrq->data)
899 goto request_done;
900
901 /* Calculate the amout of bytes transfer if there was no error */
902 if (mrq->data->error == 0) {
903 mrq->data->bytes_xfered =
904 (mrq->data->blocks * mrq->data->blksz);
905 } else {
906 mrq->data->bytes_xfered = 0;
907 }
908
909 /* If we had an error while transferring data we flush the
910 * DMA channel and the fifo to clear out any garbage. */
911 if (mrq->data->error != 0) {
912 if (s3cmci_host_usedma(host))
913 dmaengine_terminate_all(host->dma);
914
915 if (host->is2440) {
916 /* Clear failure register and reset fifo. */
917 writel(S3C2440_SDIFSTA_FIFORESET |
918 S3C2440_SDIFSTA_FIFOFAIL,
919 host->base + S3C2410_SDIFSTA);
920 } else {
921 u32 mci_con;
922
923 /* reset fifo */
924 mci_con = readl(host->base + S3C2410_SDICON);
925 mci_con |= S3C2410_SDICON_FIFORESET;
926
927 writel(mci_con, host->base + S3C2410_SDICON);
928 }
929 }
930
931 request_done:
932 host->complete_what = COMPLETION_NONE;
933 host->mrq = NULL;
934
935 s3cmci_check_sdio_irq(host);
936 mmc_request_done(host->mmc, mrq);
937 }
938
939 static void s3cmci_send_command(struct s3cmci_host *host,
940 struct mmc_command *cmd)
941 {
942 u32 ccon, imsk;
943
944 imsk = S3C2410_SDIIMSK_CRCSTATUS | S3C2410_SDIIMSK_CMDTIMEOUT |
945 S3C2410_SDIIMSK_RESPONSEND | S3C2410_SDIIMSK_CMDSENT |
946 S3C2410_SDIIMSK_RESPONSECRC;
947
948 enable_imask(host, imsk);
949
950 if (cmd->data)
951 host->complete_what = COMPLETION_XFERFINISH_RSPFIN;
952 else if (cmd->flags & MMC_RSP_PRESENT)
953 host->complete_what = COMPLETION_RSPFIN;
954 else
955 host->complete_what = COMPLETION_CMDSENT;
956
957 writel(cmd->arg, host->base + S3C2410_SDICMDARG);
958
959 ccon = cmd->opcode & S3C2410_SDICMDCON_INDEX;
960 ccon |= S3C2410_SDICMDCON_SENDERHOST | S3C2410_SDICMDCON_CMDSTART;
961
962 if (cmd->flags & MMC_RSP_PRESENT)
963 ccon |= S3C2410_SDICMDCON_WAITRSP;
964
965 if (cmd->flags & MMC_RSP_136)
966 ccon |= S3C2410_SDICMDCON_LONGRSP;
967
968 writel(ccon, host->base + S3C2410_SDICMDCON);
969 }
970
971 static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
972 {
973 u32 dcon, imsk, stoptries = 3;
974
975 /* write DCON register */
976
977 if (!data) {
978 writel(0, host->base + S3C2410_SDIDCON);
979 return 0;
980 }
981
982 if ((data->blksz & 3) != 0) {
983 /* We cannot deal with unaligned blocks with more than
984 * one block being transferred. */
985
986 if (data->blocks > 1) {
987 pr_warn("%s: can't do non-word sized block transfers (blksz %d)\n",
988 __func__, data->blksz);
989 return -EINVAL;
990 }
991 }
992
993 while (readl(host->base + S3C2410_SDIDSTA) &
994 (S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {
995
996 dbg(host, dbg_err,
997 "mci_setup_data() transfer stillin progress.\n");
998
999 writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
1000 s3cmci_reset(host);
1001
1002 if ((stoptries--) == 0) {
1003 dbg_dumpregs(host, "DRF");
1004 return -EINVAL;
1005 }
1006 }
1007
1008 dcon = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
1009
1010 if (s3cmci_host_usedma(host))
1011 dcon |= S3C2410_SDIDCON_DMAEN;
1012
1013 if (host->bus_width == MMC_BUS_WIDTH_4)
1014 dcon |= S3C2410_SDIDCON_WIDEBUS;
1015
1016 dcon |= S3C2410_SDIDCON_BLOCKMODE;
1017
1018 if (data->flags & MMC_DATA_WRITE) {
1019 dcon |= S3C2410_SDIDCON_TXAFTERRESP;
1020 dcon |= S3C2410_SDIDCON_XFER_TXSTART;
1021 }
1022
1023 if (data->flags & MMC_DATA_READ) {
1024 dcon |= S3C2410_SDIDCON_RXAFTERCMD;
1025 dcon |= S3C2410_SDIDCON_XFER_RXSTART;
1026 }
1027
1028 if (host->is2440) {
1029 dcon |= S3C2440_SDIDCON_DS_WORD;
1030 dcon |= S3C2440_SDIDCON_DATSTART;
1031 }
1032
1033 writel(dcon, host->base + S3C2410_SDIDCON);
1034
1035 /* write BSIZE register */
1036
1037 writel(data->blksz, host->base + S3C2410_SDIBSIZE);
1038
1039 /* add to IMASK register */
1040 imsk = S3C2410_SDIIMSK_FIFOFAIL | S3C2410_SDIIMSK_DATACRC |
1041 S3C2410_SDIIMSK_DATATIMEOUT | S3C2410_SDIIMSK_DATAFINISH;
1042
1043 enable_imask(host, imsk);
1044
1045 /* write TIMER register */
1046
1047 if (host->is2440) {
1048 writel(0x007FFFFF, host->base + S3C2410_SDITIMER);
1049 } else {
1050 writel(0x0000FFFF, host->base + S3C2410_SDITIMER);
1051
1052 /* FIX: set slow clock to prevent timeouts on read */
1053 if (data->flags & MMC_DATA_READ)
1054 writel(0xFF, host->base + S3C2410_SDIPRE);
1055 }
1056
1057 return 0;
1058 }
1059
1060 #define BOTH_DIR (MMC_DATA_WRITE | MMC_DATA_READ)
1061
1062 static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
1063 {
1064 int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
1065
1066 BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
1067
1068 host->pio_sgptr = 0;
1069 host->pio_bytes = 0;
1070 host->pio_count = 0;
1071 host->pio_active = rw ? XFER_WRITE : XFER_READ;
1072
1073 if (rw) {
1074 do_pio_write(host);
1075 enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
1076 } else {
1077 enable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF
1078 | S3C2410_SDIIMSK_RXFIFOLAST);
1079 }
1080
1081 return 0;
1082 }
1083
1084 static int s3cmci_prepare_dma(struct s3cmci_host *host, struct mmc_data *data)
1085 {
1086 int rw = data->flags & MMC_DATA_WRITE;
1087 struct dma_async_tx_descriptor *desc;
1088 struct dma_slave_config conf = {
1089 .src_addr = host->mem->start + host->sdidata,
1090 .dst_addr = host->mem->start + host->sdidata,
1091 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
1092 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
1093 };
1094
1095 BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
1096
1097 /* Restore prescaler value */
1098 writel(host->prescaler, host->base + S3C2410_SDIPRE);
1099
1100 if (!rw)
1101 conf.direction = DMA_DEV_TO_MEM;
1102 else
1103 conf.direction = DMA_MEM_TO_DEV;
1104
1105 dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
1106 rw ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1107
1108 dmaengine_slave_config(host->dma, &conf);
1109 desc = dmaengine_prep_slave_sg(host->dma, data->sg, data->sg_len,
1110 conf.direction,
1111 DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
1112 if (!desc)
1113 goto unmap_exit;
1114 desc->callback = s3cmci_dma_done_callback;
1115 desc->callback_param = host;
1116 dmaengine_submit(desc);
1117 dma_async_issue_pending(host->dma);
1118
1119 return 0;
1120
1121 unmap_exit:
1122 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
1123 rw ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1124 return -ENOMEM;
1125 }
1126
1127 static void s3cmci_send_request(struct mmc_host *mmc)
1128 {
1129 struct s3cmci_host *host = mmc_priv(mmc);
1130 struct mmc_request *mrq = host->mrq;
1131 struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
1132
1133 host->ccnt++;
1134 prepare_dbgmsg(host, cmd, host->cmd_is_stop);
1135
1136 /* Clear command, data and fifo status registers
1137 Fifo clear only necessary on 2440, but doesn't hurt on 2410
1138 */
1139 writel(0xFFFFFFFF, host->base + S3C2410_SDICMDSTAT);
1140 writel(0xFFFFFFFF, host->base + S3C2410_SDIDSTA);
1141 writel(0xFFFFFFFF, host->base + S3C2410_SDIFSTA);
1142
1143 if (cmd->data) {
1144 int res = s3cmci_setup_data(host, cmd->data);
1145
1146 host->dcnt++;
1147
1148 if (res) {
1149 dbg(host, dbg_err, "setup data error %d\n", res);
1150 cmd->error = res;
1151 cmd->data->error = res;
1152
1153 mmc_request_done(mmc, mrq);
1154 return;
1155 }
1156
1157 if (s3cmci_host_usedma(host))
1158 res = s3cmci_prepare_dma(host, cmd->data);
1159 else
1160 res = s3cmci_prepare_pio(host, cmd->data);
1161
1162 if (res) {
1163 dbg(host, dbg_err, "data prepare error %d\n", res);
1164 cmd->error = res;
1165 cmd->data->error = res;
1166
1167 mmc_request_done(mmc, mrq);
1168 return;
1169 }
1170 }
1171
1172 /* Send command */
1173 s3cmci_send_command(host, cmd);
1174
1175 /* Enable Interrupt */
1176 s3cmci_enable_irq(host, true);
1177 }
1178
1179 static int s3cmci_card_present(struct mmc_host *mmc)
1180 {
1181 struct s3cmci_host *host = mmc_priv(mmc);
1182 struct s3c24xx_mci_pdata *pdata = host->pdata;
1183 int ret;
1184
1185 if (pdata->no_detect)
1186 return -ENOSYS;
1187
1188 ret = gpio_get_value(pdata->gpio_detect) ? 0 : 1;
1189 return ret ^ pdata->detect_invert;
1190 }
1191
1192 static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1193 {
1194 struct s3cmci_host *host = mmc_priv(mmc);
1195
1196 host->status = "mmc request";
1197 host->cmd_is_stop = 0;
1198 host->mrq = mrq;
1199
1200 if (s3cmci_card_present(mmc) == 0) {
1201 dbg(host, dbg_err, "%s: no medium present\n", __func__);
1202 host->mrq->cmd->error = -ENOMEDIUM;
1203 mmc_request_done(mmc, mrq);
1204 } else
1205 s3cmci_send_request(mmc);
1206 }
1207
1208 static void s3cmci_set_clk(struct s3cmci_host *host, struct mmc_ios *ios)
1209 {
1210 u32 mci_psc;
1211
1212 /* Set clock */
1213 for (mci_psc = 0; mci_psc < 255; mci_psc++) {
1214 host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
1215
1216 if (host->real_rate <= ios->clock)
1217 break;
1218 }
1219
1220 if (mci_psc > 255)
1221 mci_psc = 255;
1222
1223 host->prescaler = mci_psc;
1224 writel(host->prescaler, host->base + S3C2410_SDIPRE);
1225
1226 /* If requested clock is 0, real_rate will be 0, too */
1227 if (ios->clock == 0)
1228 host->real_rate = 0;
1229 }
1230
1231 static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1232 {
1233 struct s3cmci_host *host = mmc_priv(mmc);
1234 u32 mci_con;
1235
1236 /* Set the power state */
1237
1238 mci_con = readl(host->base + S3C2410_SDICON);
1239
1240 switch (ios->power_mode) {
1241 case MMC_POWER_ON:
1242 case MMC_POWER_UP:
1243 /* Configure GPE5...GPE10 pins in SD mode */
1244 s3c_gpio_cfgall_range(S3C2410_GPE(5), 6, S3C_GPIO_SFN(2),
1245 S3C_GPIO_PULL_NONE);
1246
1247 if (host->pdata->set_power)
1248 host->pdata->set_power(ios->power_mode, ios->vdd);
1249
1250 if (!host->is2440)
1251 mci_con |= S3C2410_SDICON_FIFORESET;
1252
1253 break;
1254
1255 case MMC_POWER_OFF:
1256 default:
1257 gpio_direction_output(S3C2410_GPE(5), 0);
1258
1259 if (host->is2440)
1260 mci_con |= S3C2440_SDICON_SDRESET;
1261
1262 if (host->pdata->set_power)
1263 host->pdata->set_power(ios->power_mode, ios->vdd);
1264
1265 break;
1266 }
1267
1268 s3cmci_set_clk(host, ios);
1269
1270 /* Set CLOCK_ENABLE */
1271 if (ios->clock)
1272 mci_con |= S3C2410_SDICON_CLOCKTYPE;
1273 else
1274 mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
1275
1276 writel(mci_con, host->base + S3C2410_SDICON);
1277
1278 if ((ios->power_mode == MMC_POWER_ON) ||
1279 (ios->power_mode == MMC_POWER_UP)) {
1280 dbg(host, dbg_conf, "running at %lukHz (requested: %ukHz).\n",
1281 host->real_rate/1000, ios->clock/1000);
1282 } else {
1283 dbg(host, dbg_conf, "powered down.\n");
1284 }
1285
1286 host->bus_width = ios->bus_width;
1287 }
1288
1289 static void s3cmci_reset(struct s3cmci_host *host)
1290 {
1291 u32 con = readl(host->base + S3C2410_SDICON);
1292
1293 con |= S3C2440_SDICON_SDRESET;
1294 writel(con, host->base + S3C2410_SDICON);
1295 }
1296
1297 static int s3cmci_get_ro(struct mmc_host *mmc)
1298 {
1299 struct s3cmci_host *host = mmc_priv(mmc);
1300 struct s3c24xx_mci_pdata *pdata = host->pdata;
1301 int ret;
1302
1303 if (pdata->no_wprotect)
1304 return 0;
1305
1306 ret = gpio_get_value(pdata->gpio_wprotect) ? 1 : 0;
1307 ret ^= pdata->wprotect_invert;
1308
1309 return ret;
1310 }
1311
1312 static void s3cmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1313 {
1314 struct s3cmci_host *host = mmc_priv(mmc);
1315 unsigned long flags;
1316 u32 con;
1317
1318 local_irq_save(flags);
1319
1320 con = readl(host->base + S3C2410_SDICON);
1321 host->sdio_irqen = enable;
1322
1323 if (enable == host->sdio_irqen)
1324 goto same_state;
1325
1326 if (enable) {
1327 con |= S3C2410_SDICON_SDIOIRQ;
1328 enable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
1329
1330 if (!host->irq_state && !host->irq_disabled) {
1331 host->irq_state = true;
1332 enable_irq(host->irq);
1333 }
1334 } else {
1335 disable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
1336 con &= ~S3C2410_SDICON_SDIOIRQ;
1337
1338 if (!host->irq_enabled && host->irq_state) {
1339 disable_irq_nosync(host->irq);
1340 host->irq_state = false;
1341 }
1342 }
1343
1344 writel(con, host->base + S3C2410_SDICON);
1345
1346 same_state:
1347 local_irq_restore(flags);
1348
1349 s3cmci_check_sdio_irq(host);
1350 }
1351
1352 static struct mmc_host_ops s3cmci_ops = {
1353 .request = s3cmci_request,
1354 .set_ios = s3cmci_set_ios,
1355 .get_ro = s3cmci_get_ro,
1356 .get_cd = s3cmci_card_present,
1357 .enable_sdio_irq = s3cmci_enable_sdio_irq,
1358 };
1359
1360 static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
1361 /* This is currently here to avoid a number of if (host->pdata)
1362 * checks. Any zero fields to ensure reasonable defaults are picked. */
1363 .no_wprotect = 1,
1364 .no_detect = 1,
1365 };
1366
1367 #ifdef CONFIG_ARM_S3C24XX_CPUFREQ
1368
1369 static int s3cmci_cpufreq_transition(struct notifier_block *nb,
1370 unsigned long val, void *data)
1371 {
1372 struct s3cmci_host *host;
1373 struct mmc_host *mmc;
1374 unsigned long newclk;
1375 unsigned long flags;
1376
1377 host = container_of(nb, struct s3cmci_host, freq_transition);
1378 newclk = clk_get_rate(host->clk);
1379 mmc = host->mmc;
1380
1381 if ((val == CPUFREQ_PRECHANGE && newclk > host->clk_rate) ||
1382 (val == CPUFREQ_POSTCHANGE && newclk < host->clk_rate)) {
1383 spin_lock_irqsave(&mmc->lock, flags);
1384
1385 host->clk_rate = newclk;
1386
1387 if (mmc->ios.power_mode != MMC_POWER_OFF &&
1388 mmc->ios.clock != 0)
1389 s3cmci_set_clk(host, &mmc->ios);
1390
1391 spin_unlock_irqrestore(&mmc->lock, flags);
1392 }
1393
1394 return 0;
1395 }
1396
1397 static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1398 {
1399 host->freq_transition.notifier_call = s3cmci_cpufreq_transition;
1400
1401 return cpufreq_register_notifier(&host->freq_transition,
1402 CPUFREQ_TRANSITION_NOTIFIER);
1403 }
1404
1405 static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1406 {
1407 cpufreq_unregister_notifier(&host->freq_transition,
1408 CPUFREQ_TRANSITION_NOTIFIER);
1409 }
1410
1411 #else
1412 static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1413 {
1414 return 0;
1415 }
1416
1417 static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1418 {
1419 }
1420 #endif
1421
1422
1423 #ifdef CONFIG_DEBUG_FS
1424
1425 static int s3cmci_state_show(struct seq_file *seq, void *v)
1426 {
1427 struct s3cmci_host *host = seq->private;
1428
1429 seq_printf(seq, "Register base = 0x%08x\n", (u32)host->base);
1430 seq_printf(seq, "Clock rate = %ld\n", host->clk_rate);
1431 seq_printf(seq, "Prescale = %d\n", host->prescaler);
1432 seq_printf(seq, "is2440 = %d\n", host->is2440);
1433 seq_printf(seq, "IRQ = %d\n", host->irq);
1434 seq_printf(seq, "IRQ enabled = %d\n", host->irq_enabled);
1435 seq_printf(seq, "IRQ disabled = %d\n", host->irq_disabled);
1436 seq_printf(seq, "IRQ state = %d\n", host->irq_state);
1437 seq_printf(seq, "CD IRQ = %d\n", host->irq_cd);
1438 seq_printf(seq, "Do DMA = %d\n", s3cmci_host_usedma(host));
1439 seq_printf(seq, "SDIIMSK at %d\n", host->sdiimsk);
1440 seq_printf(seq, "SDIDATA at %d\n", host->sdidata);
1441
1442 return 0;
1443 }
1444
1445 static int s3cmci_state_open(struct inode *inode, struct file *file)
1446 {
1447 return single_open(file, s3cmci_state_show, inode->i_private);
1448 }
1449
1450 static const struct file_operations s3cmci_fops_state = {
1451 .owner = THIS_MODULE,
1452 .open = s3cmci_state_open,
1453 .read = seq_read,
1454 .llseek = seq_lseek,
1455 .release = single_release,
1456 };
1457
1458 #define DBG_REG(_r) { .addr = S3C2410_SDI##_r, .name = #_r }
1459
1460 struct s3cmci_reg {
1461 unsigned short addr;
1462 unsigned char *name;
1463 } debug_regs[] = {
1464 DBG_REG(CON),
1465 DBG_REG(PRE),
1466 DBG_REG(CMDARG),
1467 DBG_REG(CMDCON),
1468 DBG_REG(CMDSTAT),
1469 DBG_REG(RSP0),
1470 DBG_REG(RSP1),
1471 DBG_REG(RSP2),
1472 DBG_REG(RSP3),
1473 DBG_REG(TIMER),
1474 DBG_REG(BSIZE),
1475 DBG_REG(DCON),
1476 DBG_REG(DCNT),
1477 DBG_REG(DSTA),
1478 DBG_REG(FSTA),
1479 {}
1480 };
1481
1482 static int s3cmci_regs_show(struct seq_file *seq, void *v)
1483 {
1484 struct s3cmci_host *host = seq->private;
1485 struct s3cmci_reg *rptr = debug_regs;
1486
1487 for (; rptr->name; rptr++)
1488 seq_printf(seq, "SDI%s\t=0x%08x\n", rptr->name,
1489 readl(host->base + rptr->addr));
1490
1491 seq_printf(seq, "SDIIMSK\t=0x%08x\n", readl(host->base + host->sdiimsk));
1492
1493 return 0;
1494 }
1495
1496 static int s3cmci_regs_open(struct inode *inode, struct file *file)
1497 {
1498 return single_open(file, s3cmci_regs_show, inode->i_private);
1499 }
1500
1501 static const struct file_operations s3cmci_fops_regs = {
1502 .owner = THIS_MODULE,
1503 .open = s3cmci_regs_open,
1504 .read = seq_read,
1505 .llseek = seq_lseek,
1506 .release = single_release,
1507 };
1508
1509 static void s3cmci_debugfs_attach(struct s3cmci_host *host)
1510 {
1511 struct device *dev = &host->pdev->dev;
1512
1513 host->debug_root = debugfs_create_dir(dev_name(dev), NULL);
1514 if (IS_ERR(host->debug_root)) {
1515 dev_err(dev, "failed to create debugfs root\n");
1516 return;
1517 }
1518
1519 host->debug_state = debugfs_create_file("state", 0444,
1520 host->debug_root, host,
1521 &s3cmci_fops_state);
1522
1523 if (IS_ERR(host->debug_state))
1524 dev_err(dev, "failed to create debug state file\n");
1525
1526 host->debug_regs = debugfs_create_file("regs", 0444,
1527 host->debug_root, host,
1528 &s3cmci_fops_regs);
1529
1530 if (IS_ERR(host->debug_regs))
1531 dev_err(dev, "failed to create debug regs file\n");
1532 }
1533
1534 static void s3cmci_debugfs_remove(struct s3cmci_host *host)
1535 {
1536 debugfs_remove(host->debug_regs);
1537 debugfs_remove(host->debug_state);
1538 debugfs_remove(host->debug_root);
1539 }
1540
1541 #else
1542 static inline void s3cmci_debugfs_attach(struct s3cmci_host *host) { }
1543 static inline void s3cmci_debugfs_remove(struct s3cmci_host *host) { }
1544
1545 #endif /* CONFIG_DEBUG_FS */
1546
1547 static int s3cmci_probe(struct platform_device *pdev)
1548 {
1549 struct s3cmci_host *host;
1550 struct mmc_host *mmc;
1551 int ret;
1552 int is2440;
1553 int i;
1554
1555 is2440 = platform_get_device_id(pdev)->driver_data;
1556
1557 mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
1558 if (!mmc) {
1559 ret = -ENOMEM;
1560 goto probe_out;
1561 }
1562
1563 for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++) {
1564 ret = gpio_request(i, dev_name(&pdev->dev));
1565 if (ret) {
1566 dev_err(&pdev->dev, "failed to get gpio %d\n", i);
1567
1568 for (i--; i >= S3C2410_GPE(5); i--)
1569 gpio_free(i);
1570
1571 goto probe_free_host;
1572 }
1573 }
1574
1575 host = mmc_priv(mmc);
1576 host->mmc = mmc;
1577 host->pdev = pdev;
1578 host->is2440 = is2440;
1579
1580 host->pdata = pdev->dev.platform_data;
1581 if (!host->pdata) {
1582 pdev->dev.platform_data = &s3cmci_def_pdata;
1583 host->pdata = &s3cmci_def_pdata;
1584 }
1585
1586 spin_lock_init(&host->complete_lock);
1587 tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
1588
1589 if (is2440) {
1590 host->sdiimsk = S3C2440_SDIIMSK;
1591 host->sdidata = S3C2440_SDIDATA;
1592 host->clk_div = 1;
1593 } else {
1594 host->sdiimsk = S3C2410_SDIIMSK;
1595 host->sdidata = S3C2410_SDIDATA;
1596 host->clk_div = 2;
1597 }
1598
1599 host->complete_what = COMPLETION_NONE;
1600 host->pio_active = XFER_NONE;
1601
1602 host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1603 if (!host->mem) {
1604 dev_err(&pdev->dev,
1605 "failed to get io memory region resource.\n");
1606
1607 ret = -ENOENT;
1608 goto probe_free_gpio;
1609 }
1610
1611 host->mem = request_mem_region(host->mem->start,
1612 resource_size(host->mem), pdev->name);
1613
1614 if (!host->mem) {
1615 dev_err(&pdev->dev, "failed to request io memory region.\n");
1616 ret = -ENOENT;
1617 goto probe_free_gpio;
1618 }
1619
1620 host->base = ioremap(host->mem->start, resource_size(host->mem));
1621 if (!host->base) {
1622 dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
1623 ret = -EINVAL;
1624 goto probe_free_mem_region;
1625 }
1626
1627 host->irq = platform_get_irq(pdev, 0);
1628 if (host->irq == 0) {
1629 dev_err(&pdev->dev, "failed to get interrupt resource.\n");
1630 ret = -EINVAL;
1631 goto probe_iounmap;
1632 }
1633
1634 if (request_irq(host->irq, s3cmci_irq, 0, DRIVER_NAME, host)) {
1635 dev_err(&pdev->dev, "failed to request mci interrupt.\n");
1636 ret = -ENOENT;
1637 goto probe_iounmap;
1638 }
1639
1640 /* We get spurious interrupts even when we have set the IMSK
1641 * register to ignore everything, so use disable_irq() to make
1642 * ensure we don't lock the system with un-serviceable requests. */
1643
1644 disable_irq(host->irq);
1645 host->irq_state = false;
1646
1647 if (!host->pdata->no_detect) {
1648 ret = gpio_request(host->pdata->gpio_detect, "s3cmci detect");
1649 if (ret) {
1650 dev_err(&pdev->dev, "failed to get detect gpio\n");
1651 goto probe_free_irq;
1652 }
1653
1654 host->irq_cd = gpio_to_irq(host->pdata->gpio_detect);
1655
1656 if (host->irq_cd >= 0) {
1657 if (request_irq(host->irq_cd, s3cmci_irq_cd,
1658 IRQF_TRIGGER_RISING |
1659 IRQF_TRIGGER_FALLING,
1660 DRIVER_NAME, host)) {
1661 dev_err(&pdev->dev,
1662 "can't get card detect irq.\n");
1663 ret = -ENOENT;
1664 goto probe_free_gpio_cd;
1665 }
1666 } else {
1667 dev_warn(&pdev->dev,
1668 "host detect has no irq available\n");
1669 gpio_direction_input(host->pdata->gpio_detect);
1670 }
1671 } else
1672 host->irq_cd = -1;
1673
1674 if (!host->pdata->no_wprotect) {
1675 ret = gpio_request(host->pdata->gpio_wprotect, "s3cmci wp");
1676 if (ret) {
1677 dev_err(&pdev->dev, "failed to get writeprotect\n");
1678 goto probe_free_irq_cd;
1679 }
1680
1681 gpio_direction_input(host->pdata->gpio_wprotect);
1682 }
1683
1684 /* Depending on the dma state, get a DMA channel to use. */
1685
1686 if (s3cmci_host_usedma(host)) {
1687 host->dma = dma_request_chan(&pdev->dev, "rx-tx");
1688 ret = PTR_ERR_OR_ZERO(host->dma);
1689 if (ret) {
1690 dev_err(&pdev->dev, "cannot get DMA channel.\n");
1691 goto probe_free_gpio_wp;
1692 }
1693 }
1694
1695 host->clk = clk_get(&pdev->dev, "sdi");
1696 if (IS_ERR(host->clk)) {
1697 dev_err(&pdev->dev, "failed to find clock source.\n");
1698 ret = PTR_ERR(host->clk);
1699 host->clk = NULL;
1700 goto probe_free_dma;
1701 }
1702
1703 ret = clk_prepare_enable(host->clk);
1704 if (ret) {
1705 dev_err(&pdev->dev, "failed to enable clock source.\n");
1706 goto clk_free;
1707 }
1708
1709 host->clk_rate = clk_get_rate(host->clk);
1710
1711 mmc->ops = &s3cmci_ops;
1712 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1713 #ifdef CONFIG_MMC_S3C_HW_SDIO_IRQ
1714 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1715 #else
1716 mmc->caps = MMC_CAP_4_BIT_DATA;
1717 #endif
1718 mmc->f_min = host->clk_rate / (host->clk_div * 256);
1719 mmc->f_max = host->clk_rate / host->clk_div;
1720
1721 if (host->pdata->ocr_avail)
1722 mmc->ocr_avail = host->pdata->ocr_avail;
1723
1724 mmc->max_blk_count = 4095;
1725 mmc->max_blk_size = 4095;
1726 mmc->max_req_size = 4095 * 512;
1727 mmc->max_seg_size = mmc->max_req_size;
1728
1729 mmc->max_segs = 128;
1730
1731 dbg(host, dbg_debug,
1732 "probe: mode:%s mapped mci_base:%p irq:%u irq_cd:%u dma:%p.\n",
1733 (host->is2440?"2440":""),
1734 host->base, host->irq, host->irq_cd, host->dma);
1735
1736 ret = s3cmci_cpufreq_register(host);
1737 if (ret) {
1738 dev_err(&pdev->dev, "failed to register cpufreq\n");
1739 goto free_dmabuf;
1740 }
1741
1742 ret = mmc_add_host(mmc);
1743 if (ret) {
1744 dev_err(&pdev->dev, "failed to add mmc host.\n");
1745 goto free_cpufreq;
1746 }
1747
1748 s3cmci_debugfs_attach(host);
1749
1750 platform_set_drvdata(pdev, mmc);
1751 dev_info(&pdev->dev, "%s - using %s, %s SDIO IRQ\n", mmc_hostname(mmc),
1752 s3cmci_host_usedma(host) ? "dma" : "pio",
1753 mmc->caps & MMC_CAP_SDIO_IRQ ? "hw" : "sw");
1754
1755 return 0;
1756
1757 free_cpufreq:
1758 s3cmci_cpufreq_deregister(host);
1759
1760 free_dmabuf:
1761 clk_disable_unprepare(host->clk);
1762
1763 clk_free:
1764 clk_put(host->clk);
1765
1766 probe_free_dma:
1767 if (s3cmci_host_usedma(host))
1768 dma_release_channel(host->dma);
1769
1770 probe_free_gpio_wp:
1771 if (!host->pdata->no_wprotect)
1772 gpio_free(host->pdata->gpio_wprotect);
1773
1774 probe_free_gpio_cd:
1775 if (!host->pdata->no_detect)
1776 gpio_free(host->pdata->gpio_detect);
1777
1778 probe_free_irq_cd:
1779 if (host->irq_cd >= 0)
1780 free_irq(host->irq_cd, host);
1781
1782 probe_free_irq:
1783 free_irq(host->irq, host);
1784
1785 probe_iounmap:
1786 iounmap(host->base);
1787
1788 probe_free_mem_region:
1789 release_mem_region(host->mem->start, resource_size(host->mem));
1790
1791 probe_free_gpio:
1792 for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
1793 gpio_free(i);
1794
1795 probe_free_host:
1796 mmc_free_host(mmc);
1797
1798 probe_out:
1799 return ret;
1800 }
1801
1802 static void s3cmci_shutdown(struct platform_device *pdev)
1803 {
1804 struct mmc_host *mmc = platform_get_drvdata(pdev);
1805 struct s3cmci_host *host = mmc_priv(mmc);
1806
1807 if (host->irq_cd >= 0)
1808 free_irq(host->irq_cd, host);
1809
1810 s3cmci_debugfs_remove(host);
1811 s3cmci_cpufreq_deregister(host);
1812 mmc_remove_host(mmc);
1813 clk_disable_unprepare(host->clk);
1814 }
1815
1816 static int s3cmci_remove(struct platform_device *pdev)
1817 {
1818 struct mmc_host *mmc = platform_get_drvdata(pdev);
1819 struct s3cmci_host *host = mmc_priv(mmc);
1820 struct s3c24xx_mci_pdata *pd = host->pdata;
1821 int i;
1822
1823 s3cmci_shutdown(pdev);
1824
1825 clk_put(host->clk);
1826
1827 tasklet_disable(&host->pio_tasklet);
1828
1829 if (s3cmci_host_usedma(host))
1830 dma_release_channel(host->dma);
1831
1832 free_irq(host->irq, host);
1833
1834 if (!pd->no_wprotect)
1835 gpio_free(pd->gpio_wprotect);
1836
1837 if (!pd->no_detect)
1838 gpio_free(pd->gpio_detect);
1839
1840 for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
1841 gpio_free(i);
1842
1843
1844 iounmap(host->base);
1845 release_mem_region(host->mem->start, resource_size(host->mem));
1846
1847 mmc_free_host(mmc);
1848 return 0;
1849 }
1850
1851 static const struct platform_device_id s3cmci_driver_ids[] = {
1852 {
1853 .name = "s3c2410-sdi",
1854 .driver_data = 0,
1855 }, {
1856 .name = "s3c2412-sdi",
1857 .driver_data = 1,
1858 }, {
1859 .name = "s3c2440-sdi",
1860 .driver_data = 1,
1861 },
1862 { }
1863 };
1864
1865 MODULE_DEVICE_TABLE(platform, s3cmci_driver_ids);
1866
1867 static struct platform_driver s3cmci_driver = {
1868 .driver = {
1869 .name = "s3c-sdi",
1870 },
1871 .id_table = s3cmci_driver_ids,
1872 .probe = s3cmci_probe,
1873 .remove = s3cmci_remove,
1874 .shutdown = s3cmci_shutdown,
1875 };
1876
1877 module_platform_driver(s3cmci_driver);
1878
1879 MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
1880 MODULE_LICENSE("GPL v2");
1881 MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>, Ben Dooks <ben-linux@fluff.org>");
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