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[SPARC64]: Optimize fault kprobe handling just like powerpc.
[deliverable/linux.git] / drivers / mmc / host / tifm_sd.c
1 /*
2 * tifm_sd.c - TI FlashMedia driver
3 *
4 * Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Special thanks to Brad Campbell for extensive testing of this driver.
11 *
12 */
13
14
15 #include <linux/tifm.h>
16 #include <linux/mmc/host.h>
17 #include <linux/highmem.h>
18 #include <linux/scatterlist.h>
19 #include <asm/io.h>
20
21 #define DRIVER_NAME "tifm_sd"
22 #define DRIVER_VERSION "0.8"
23
24 static int no_dma = 0;
25 static int fixed_timeout = 0;
26 module_param(no_dma, bool, 0644);
27 module_param(fixed_timeout, bool, 0644);
28
29 /* Constants here are mostly from OMAP5912 datasheet */
30 #define TIFM_MMCSD_RESET 0x0002
31 #define TIFM_MMCSD_CLKMASK 0x03ff
32 #define TIFM_MMCSD_POWER 0x0800
33 #define TIFM_MMCSD_4BBUS 0x8000
34 #define TIFM_MMCSD_RXDE 0x8000 /* rx dma enable */
35 #define TIFM_MMCSD_TXDE 0x0080 /* tx dma enable */
36 #define TIFM_MMCSD_BUFINT 0x0c00 /* set bits: AE, AF */
37 #define TIFM_MMCSD_DPE 0x0020 /* data timeout counted in kilocycles */
38 #define TIFM_MMCSD_INAB 0x0080 /* abort / initialize command */
39 #define TIFM_MMCSD_READ 0x8000
40
41 #define TIFM_MMCSD_ERRMASK 0x01e0 /* set bits: CCRC, CTO, DCRC, DTO */
42 #define TIFM_MMCSD_EOC 0x0001 /* end of command phase */
43 #define TIFM_MMCSD_CD 0x0002 /* card detect */
44 #define TIFM_MMCSD_CB 0x0004 /* card enter busy state */
45 #define TIFM_MMCSD_BRS 0x0008 /* block received/sent */
46 #define TIFM_MMCSD_EOFB 0x0010 /* card exit busy state */
47 #define TIFM_MMCSD_DTO 0x0020 /* data time-out */
48 #define TIFM_MMCSD_DCRC 0x0040 /* data crc error */
49 #define TIFM_MMCSD_CTO 0x0080 /* command time-out */
50 #define TIFM_MMCSD_CCRC 0x0100 /* command crc error */
51 #define TIFM_MMCSD_AF 0x0400 /* fifo almost full */
52 #define TIFM_MMCSD_AE 0x0800 /* fifo almost empty */
53 #define TIFM_MMCSD_OCRB 0x1000 /* OCR busy */
54 #define TIFM_MMCSD_CIRQ 0x2000 /* card irq (cmd40/sdio) */
55 #define TIFM_MMCSD_CERR 0x4000 /* card status error */
56
57 #define TIFM_MMCSD_ODTO 0x0040 /* open drain / extended timeout */
58 #define TIFM_MMCSD_CARD_RO 0x0200 /* card is read-only */
59
60 #define TIFM_MMCSD_FIFO_SIZE 0x0020
61
62 #define TIFM_MMCSD_RSP_R0 0x0000
63 #define TIFM_MMCSD_RSP_R1 0x0100
64 #define TIFM_MMCSD_RSP_R2 0x0200
65 #define TIFM_MMCSD_RSP_R3 0x0300
66 #define TIFM_MMCSD_RSP_R4 0x0400
67 #define TIFM_MMCSD_RSP_R5 0x0500
68 #define TIFM_MMCSD_RSP_R6 0x0600
69
70 #define TIFM_MMCSD_RSP_BUSY 0x0800
71
72 #define TIFM_MMCSD_CMD_BC 0x0000
73 #define TIFM_MMCSD_CMD_BCR 0x1000
74 #define TIFM_MMCSD_CMD_AC 0x2000
75 #define TIFM_MMCSD_CMD_ADTC 0x3000
76
77 #define TIFM_MMCSD_MAX_BLOCK_SIZE 0x0800UL
78
79 enum {
80 CMD_READY = 0x0001,
81 FIFO_READY = 0x0002,
82 BRS_READY = 0x0004,
83 SCMD_ACTIVE = 0x0008,
84 SCMD_READY = 0x0010,
85 CARD_BUSY = 0x0020,
86 DATA_CARRY = 0x0040
87 };
88
89 struct tifm_sd {
90 struct tifm_dev *dev;
91
92 unsigned short eject:1,
93 open_drain:1,
94 no_dma:1;
95 unsigned short cmd_flags;
96
97 unsigned int clk_freq;
98 unsigned int clk_div;
99 unsigned long timeout_jiffies;
100
101 struct tasklet_struct finish_tasklet;
102 struct timer_list timer;
103 struct mmc_request *req;
104
105 int sg_len;
106 int sg_pos;
107 unsigned int block_pos;
108 struct scatterlist bounce_buf;
109 unsigned char bounce_buf_data[TIFM_MMCSD_MAX_BLOCK_SIZE];
110 };
111
112 /* for some reason, host won't respond correctly to readw/writew */
113 static void tifm_sd_read_fifo(struct tifm_sd *host, struct page *pg,
114 unsigned int off, unsigned int cnt)
115 {
116 struct tifm_dev *sock = host->dev;
117 unsigned char *buf;
118 unsigned int pos = 0, val;
119
120 buf = kmap_atomic(pg, KM_BIO_DST_IRQ) + off;
121 if (host->cmd_flags & DATA_CARRY) {
122 buf[pos++] = host->bounce_buf_data[0];
123 host->cmd_flags &= ~DATA_CARRY;
124 }
125
126 while (pos < cnt) {
127 val = readl(sock->addr + SOCK_MMCSD_DATA);
128 buf[pos++] = val & 0xff;
129 if (pos == cnt) {
130 host->bounce_buf_data[0] = (val >> 8) & 0xff;
131 host->cmd_flags |= DATA_CARRY;
132 break;
133 }
134 buf[pos++] = (val >> 8) & 0xff;
135 }
136 kunmap_atomic(buf - off, KM_BIO_DST_IRQ);
137 }
138
139 static void tifm_sd_write_fifo(struct tifm_sd *host, struct page *pg,
140 unsigned int off, unsigned int cnt)
141 {
142 struct tifm_dev *sock = host->dev;
143 unsigned char *buf;
144 unsigned int pos = 0, val;
145
146 buf = kmap_atomic(pg, KM_BIO_SRC_IRQ) + off;
147 if (host->cmd_flags & DATA_CARRY) {
148 val = host->bounce_buf_data[0] | ((buf[pos++] << 8) & 0xff00);
149 writel(val, sock->addr + SOCK_MMCSD_DATA);
150 host->cmd_flags &= ~DATA_CARRY;
151 }
152
153 while (pos < cnt) {
154 val = buf[pos++];
155 if (pos == cnt) {
156 host->bounce_buf_data[0] = val & 0xff;
157 host->cmd_flags |= DATA_CARRY;
158 break;
159 }
160 val |= (buf[pos++] << 8) & 0xff00;
161 writel(val, sock->addr + SOCK_MMCSD_DATA);
162 }
163 kunmap_atomic(buf - off, KM_BIO_SRC_IRQ);
164 }
165
166 static void tifm_sd_transfer_data(struct tifm_sd *host)
167 {
168 struct mmc_data *r_data = host->req->cmd->data;
169 struct scatterlist *sg = r_data->sg;
170 unsigned int off, cnt, t_size = TIFM_MMCSD_FIFO_SIZE * 2;
171 unsigned int p_off, p_cnt;
172 struct page *pg;
173
174 if (host->sg_pos == host->sg_len)
175 return;
176 while (t_size) {
177 cnt = sg[host->sg_pos].length - host->block_pos;
178 if (!cnt) {
179 host->block_pos = 0;
180 host->sg_pos++;
181 if (host->sg_pos == host->sg_len) {
182 if ((r_data->flags & MMC_DATA_WRITE)
183 && DATA_CARRY)
184 writel(host->bounce_buf_data[0],
185 host->dev->addr
186 + SOCK_MMCSD_DATA);
187
188 return;
189 }
190 cnt = sg[host->sg_pos].length;
191 }
192 off = sg[host->sg_pos].offset + host->block_pos;
193
194 pg = nth_page(sg[host->sg_pos].page, off >> PAGE_SHIFT);
195 p_off = offset_in_page(off);
196 p_cnt = PAGE_SIZE - p_off;
197 p_cnt = min(p_cnt, cnt);
198 p_cnt = min(p_cnt, t_size);
199
200 if (r_data->flags & MMC_DATA_READ)
201 tifm_sd_read_fifo(host, pg, p_off, p_cnt);
202 else if (r_data->flags & MMC_DATA_WRITE)
203 tifm_sd_write_fifo(host, pg, p_off, p_cnt);
204
205 t_size -= p_cnt;
206 host->block_pos += p_cnt;
207 }
208 }
209
210 static void tifm_sd_copy_page(struct page *dst, unsigned int dst_off,
211 struct page *src, unsigned int src_off,
212 unsigned int count)
213 {
214 unsigned char *src_buf = kmap_atomic(src, KM_BIO_SRC_IRQ) + src_off;
215 unsigned char *dst_buf = kmap_atomic(dst, KM_BIO_DST_IRQ) + dst_off;
216
217 memcpy(dst_buf, src_buf, count);
218
219 kunmap_atomic(dst_buf - dst_off, KM_BIO_DST_IRQ);
220 kunmap_atomic(src_buf - src_off, KM_BIO_SRC_IRQ);
221 }
222
223 static void tifm_sd_bounce_block(struct tifm_sd *host, struct mmc_data *r_data)
224 {
225 struct scatterlist *sg = r_data->sg;
226 unsigned int t_size = r_data->blksz;
227 unsigned int off, cnt;
228 unsigned int p_off, p_cnt;
229 struct page *pg;
230
231 dev_dbg(&host->dev->dev, "bouncing block\n");
232 while (t_size) {
233 cnt = sg[host->sg_pos].length - host->block_pos;
234 if (!cnt) {
235 host->block_pos = 0;
236 host->sg_pos++;
237 if (host->sg_pos == host->sg_len)
238 return;
239 cnt = sg[host->sg_pos].length;
240 }
241 off = sg[host->sg_pos].offset + host->block_pos;
242
243 pg = nth_page(sg[host->sg_pos].page, off >> PAGE_SHIFT);
244 p_off = offset_in_page(off);
245 p_cnt = PAGE_SIZE - p_off;
246 p_cnt = min(p_cnt, cnt);
247 p_cnt = min(p_cnt, t_size);
248
249 if (r_data->flags & MMC_DATA_WRITE)
250 tifm_sd_copy_page(host->bounce_buf.page,
251 r_data->blksz - t_size,
252 pg, p_off, p_cnt);
253 else if (r_data->flags & MMC_DATA_READ)
254 tifm_sd_copy_page(pg, p_off, host->bounce_buf.page,
255 r_data->blksz - t_size, p_cnt);
256
257 t_size -= p_cnt;
258 host->block_pos += p_cnt;
259 }
260 }
261
262 static int tifm_sd_set_dma_data(struct tifm_sd *host, struct mmc_data *r_data)
263 {
264 struct tifm_dev *sock = host->dev;
265 unsigned int t_size = TIFM_DMA_TSIZE * r_data->blksz;
266 unsigned int dma_len, dma_blk_cnt, dma_off;
267 struct scatterlist *sg = NULL;
268 unsigned long flags;
269
270 if (host->sg_pos == host->sg_len)
271 return 1;
272
273 if (host->cmd_flags & DATA_CARRY) {
274 host->cmd_flags &= ~DATA_CARRY;
275 local_irq_save(flags);
276 tifm_sd_bounce_block(host, r_data);
277 local_irq_restore(flags);
278 if (host->sg_pos == host->sg_len)
279 return 1;
280 }
281
282 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]) - host->block_pos;
283 if (!dma_len) {
284 host->block_pos = 0;
285 host->sg_pos++;
286 if (host->sg_pos == host->sg_len)
287 return 1;
288 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]);
289 }
290
291 if (dma_len < t_size) {
292 dma_blk_cnt = dma_len / r_data->blksz;
293 dma_off = host->block_pos;
294 host->block_pos += dma_blk_cnt * r_data->blksz;
295 } else {
296 dma_blk_cnt = TIFM_DMA_TSIZE;
297 dma_off = host->block_pos;
298 host->block_pos += t_size;
299 }
300
301 if (dma_blk_cnt)
302 sg = &r_data->sg[host->sg_pos];
303 else if (dma_len) {
304 if (r_data->flags & MMC_DATA_WRITE) {
305 local_irq_save(flags);
306 tifm_sd_bounce_block(host, r_data);
307 local_irq_restore(flags);
308 } else
309 host->cmd_flags |= DATA_CARRY;
310
311 sg = &host->bounce_buf;
312 dma_off = 0;
313 dma_blk_cnt = 1;
314 } else
315 return 1;
316
317 dev_dbg(&sock->dev, "setting dma for %d blocks\n", dma_blk_cnt);
318 writel(sg_dma_address(sg) + dma_off, sock->addr + SOCK_DMA_ADDRESS);
319 if (r_data->flags & MMC_DATA_WRITE)
320 writel((dma_blk_cnt << 8) | TIFM_DMA_TX | TIFM_DMA_EN,
321 sock->addr + SOCK_DMA_CONTROL);
322 else
323 writel((dma_blk_cnt << 8) | TIFM_DMA_EN,
324 sock->addr + SOCK_DMA_CONTROL);
325
326 return 0;
327 }
328
329 static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
330 {
331 unsigned int rc = 0;
332
333 switch (mmc_resp_type(cmd)) {
334 case MMC_RSP_NONE:
335 rc |= TIFM_MMCSD_RSP_R0;
336 break;
337 case MMC_RSP_R1B:
338 rc |= TIFM_MMCSD_RSP_BUSY; // deliberate fall-through
339 case MMC_RSP_R1:
340 rc |= TIFM_MMCSD_RSP_R1;
341 break;
342 case MMC_RSP_R2:
343 rc |= TIFM_MMCSD_RSP_R2;
344 break;
345 case MMC_RSP_R3:
346 rc |= TIFM_MMCSD_RSP_R3;
347 break;
348 default:
349 BUG();
350 }
351
352 switch (mmc_cmd_type(cmd)) {
353 case MMC_CMD_BC:
354 rc |= TIFM_MMCSD_CMD_BC;
355 break;
356 case MMC_CMD_BCR:
357 rc |= TIFM_MMCSD_CMD_BCR;
358 break;
359 case MMC_CMD_AC:
360 rc |= TIFM_MMCSD_CMD_AC;
361 break;
362 case MMC_CMD_ADTC:
363 rc |= TIFM_MMCSD_CMD_ADTC;
364 break;
365 default:
366 BUG();
367 }
368 return rc;
369 }
370
371 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
372 {
373 struct tifm_dev *sock = host->dev;
374 unsigned int cmd_mask = tifm_sd_op_flags(cmd);
375
376 if (host->open_drain)
377 cmd_mask |= TIFM_MMCSD_ODTO;
378
379 if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
380 cmd_mask |= TIFM_MMCSD_READ;
381
382 dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
383 cmd->opcode, cmd->arg, cmd_mask);
384
385 writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
386 writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
387 writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
388 }
389
390 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
391 {
392 cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
393 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
394 cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
395 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
396 cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
397 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
398 cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
399 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
400 }
401
402 static void tifm_sd_check_status(struct tifm_sd *host)
403 {
404 struct tifm_dev *sock = host->dev;
405 struct mmc_command *cmd = host->req->cmd;
406
407 if (cmd->error != MMC_ERR_NONE)
408 goto finish_request;
409
410 if (!(host->cmd_flags & CMD_READY))
411 return;
412
413 if (cmd->data) {
414 if (cmd->data->error != MMC_ERR_NONE) {
415 if ((host->cmd_flags & SCMD_ACTIVE)
416 && !(host->cmd_flags & SCMD_READY))
417 return;
418
419 goto finish_request;
420 }
421
422 if (!(host->cmd_flags & BRS_READY))
423 return;
424
425 if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
426 return;
427
428 if (cmd->data->flags & MMC_DATA_WRITE) {
429 if (host->req->stop) {
430 if (!(host->cmd_flags & SCMD_ACTIVE)) {
431 host->cmd_flags |= SCMD_ACTIVE;
432 writel(TIFM_MMCSD_EOFB
433 | readl(sock->addr
434 + SOCK_MMCSD_INT_ENABLE),
435 sock->addr
436 + SOCK_MMCSD_INT_ENABLE);
437 tifm_sd_exec(host, host->req->stop);
438 return;
439 } else {
440 if (!(host->cmd_flags & SCMD_READY)
441 || (host->cmd_flags & CARD_BUSY))
442 return;
443 writel((~TIFM_MMCSD_EOFB)
444 & readl(sock->addr
445 + SOCK_MMCSD_INT_ENABLE),
446 sock->addr
447 + SOCK_MMCSD_INT_ENABLE);
448 }
449 } else {
450 if (host->cmd_flags & CARD_BUSY)
451 return;
452 writel((~TIFM_MMCSD_EOFB)
453 & readl(sock->addr
454 + SOCK_MMCSD_INT_ENABLE),
455 sock->addr + SOCK_MMCSD_INT_ENABLE);
456 }
457 } else {
458 if (host->req->stop) {
459 if (!(host->cmd_flags & SCMD_ACTIVE)) {
460 host->cmd_flags |= SCMD_ACTIVE;
461 tifm_sd_exec(host, host->req->stop);
462 return;
463 } else {
464 if (!(host->cmd_flags & SCMD_READY))
465 return;
466 }
467 }
468 }
469 }
470 finish_request:
471 tasklet_schedule(&host->finish_tasklet);
472 }
473
474 /* Called from interrupt handler */
475 static void tifm_sd_data_event(struct tifm_dev *sock)
476 {
477 struct tifm_sd *host;
478 unsigned int fifo_status = 0;
479 struct mmc_data *r_data = NULL;
480
481 spin_lock(&sock->lock);
482 host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
483 fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
484 dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
485 fifo_status, host->cmd_flags);
486
487 if (host->req) {
488 r_data = host->req->cmd->data;
489
490 if (r_data && (fifo_status & TIFM_FIFO_READY)) {
491 if (tifm_sd_set_dma_data(host, r_data)) {
492 host->cmd_flags |= FIFO_READY;
493 tifm_sd_check_status(host);
494 }
495 }
496 }
497
498 writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
499 spin_unlock(&sock->lock);
500 }
501
502 /* Called from interrupt handler */
503 static void tifm_sd_card_event(struct tifm_dev *sock)
504 {
505 struct tifm_sd *host;
506 unsigned int host_status = 0;
507 int cmd_error = MMC_ERR_NONE;
508 struct mmc_command *cmd = NULL;
509 unsigned long flags;
510
511 spin_lock(&sock->lock);
512 host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
513 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
514 dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
515 host_status, host->cmd_flags);
516
517 if (host->req) {
518 cmd = host->req->cmd;
519
520 if (host_status & TIFM_MMCSD_ERRMASK) {
521 writel(host_status & TIFM_MMCSD_ERRMASK,
522 sock->addr + SOCK_MMCSD_STATUS);
523 if (host_status & TIFM_MMCSD_CTO)
524 cmd_error = MMC_ERR_TIMEOUT;
525 else if (host_status & TIFM_MMCSD_CCRC)
526 cmd_error = MMC_ERR_BADCRC;
527
528 if (cmd->data) {
529 if (host_status & TIFM_MMCSD_DTO)
530 cmd->data->error = MMC_ERR_TIMEOUT;
531 else if (host_status & TIFM_MMCSD_DCRC)
532 cmd->data->error = MMC_ERR_BADCRC;
533 }
534
535 writel(TIFM_FIFO_INT_SETALL,
536 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
537 writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
538
539 if (host->req->stop) {
540 if (host->cmd_flags & SCMD_ACTIVE) {
541 host->req->stop->error = cmd_error;
542 host->cmd_flags |= SCMD_READY;
543 } else {
544 cmd->error = cmd_error;
545 host->cmd_flags |= SCMD_ACTIVE;
546 tifm_sd_exec(host, host->req->stop);
547 goto done;
548 }
549 } else
550 cmd->error = cmd_error;
551 } else {
552 if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
553 if (!(host->cmd_flags & CMD_READY)) {
554 host->cmd_flags |= CMD_READY;
555 tifm_sd_fetch_resp(cmd, sock);
556 } else if (host->cmd_flags & SCMD_ACTIVE) {
557 host->cmd_flags |= SCMD_READY;
558 tifm_sd_fetch_resp(host->req->stop,
559 sock);
560 }
561 }
562 if (host_status & TIFM_MMCSD_BRS)
563 host->cmd_flags |= BRS_READY;
564 }
565
566 if (host->no_dma && cmd->data) {
567 if (host_status & TIFM_MMCSD_AE)
568 writel(host_status & TIFM_MMCSD_AE,
569 sock->addr + SOCK_MMCSD_STATUS);
570
571 if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
572 | TIFM_MMCSD_BRS)) {
573 local_irq_save(flags);
574 tifm_sd_transfer_data(host);
575 local_irq_restore(flags);
576 host_status &= ~TIFM_MMCSD_AE;
577 }
578 }
579
580 if (host_status & TIFM_MMCSD_EOFB)
581 host->cmd_flags &= ~CARD_BUSY;
582 else if (host_status & TIFM_MMCSD_CB)
583 host->cmd_flags |= CARD_BUSY;
584
585 tifm_sd_check_status(host);
586 }
587 done:
588 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
589 spin_unlock(&sock->lock);
590 }
591
592 static void tifm_sd_set_data_timeout(struct tifm_sd *host,
593 struct mmc_data *data)
594 {
595 struct tifm_dev *sock = host->dev;
596 unsigned int data_timeout = data->timeout_clks;
597
598 if (fixed_timeout)
599 return;
600
601 data_timeout += data->timeout_ns /
602 ((1000000000UL / host->clk_freq) * host->clk_div);
603
604 if (data_timeout < 0xffff) {
605 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
606 writel((~TIFM_MMCSD_DPE)
607 & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
608 sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
609 } else {
610 data_timeout = (data_timeout >> 10) + 1;
611 if (data_timeout > 0xffff)
612 data_timeout = 0; /* set to unlimited */
613 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
614 writel(TIFM_MMCSD_DPE
615 | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
616 sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
617 }
618 }
619
620 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
621 {
622 struct tifm_sd *host = mmc_priv(mmc);
623 struct tifm_dev *sock = host->dev;
624 unsigned long flags;
625 struct mmc_data *r_data = mrq->cmd->data;
626
627 spin_lock_irqsave(&sock->lock, flags);
628 if (host->eject) {
629 spin_unlock_irqrestore(&sock->lock, flags);
630 goto err_out;
631 }
632
633 if (host->req) {
634 printk(KERN_ERR "%s : unfinished request detected\n",
635 sock->dev.bus_id);
636 spin_unlock_irqrestore(&sock->lock, flags);
637 goto err_out;
638 }
639
640 host->cmd_flags = 0;
641 host->block_pos = 0;
642 host->sg_pos = 0;
643
644 if (r_data) {
645 tifm_sd_set_data_timeout(host, r_data);
646
647 if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop)
648 writel(TIFM_MMCSD_EOFB
649 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
650 sock->addr + SOCK_MMCSD_INT_ENABLE);
651
652 if (host->no_dma) {
653 writel(TIFM_MMCSD_BUFINT
654 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
655 sock->addr + SOCK_MMCSD_INT_ENABLE);
656 writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
657 | (TIFM_MMCSD_FIFO_SIZE - 1),
658 sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
659
660 host->sg_len = r_data->sg_len;
661 } else {
662 sg_init_one(&host->bounce_buf, host->bounce_buf_data,
663 r_data->blksz);
664
665 if(1 != tifm_map_sg(sock, &host->bounce_buf, 1,
666 r_data->flags & MMC_DATA_WRITE
667 ? PCI_DMA_TODEVICE
668 : PCI_DMA_FROMDEVICE)) {
669 printk(KERN_ERR "%s : scatterlist map failed\n",
670 sock->dev.bus_id);
671 spin_unlock_irqrestore(&sock->lock, flags);
672 goto err_out;
673 }
674 host->sg_len = tifm_map_sg(sock, r_data->sg,
675 r_data->sg_len,
676 r_data->flags
677 & MMC_DATA_WRITE
678 ? PCI_DMA_TODEVICE
679 : PCI_DMA_FROMDEVICE);
680 if (host->sg_len < 1) {
681 printk(KERN_ERR "%s : scatterlist map failed\n",
682 sock->dev.bus_id);
683 tifm_unmap_sg(sock, &host->bounce_buf, 1,
684 r_data->flags & MMC_DATA_WRITE
685 ? PCI_DMA_TODEVICE
686 : PCI_DMA_FROMDEVICE);
687 spin_unlock_irqrestore(&sock->lock, flags);
688 goto err_out;
689 }
690
691 writel(TIFM_FIFO_INT_SETALL,
692 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
693 writel(ilog2(r_data->blksz) - 2,
694 sock->addr + SOCK_FIFO_PAGE_SIZE);
695 writel(TIFM_FIFO_ENABLE,
696 sock->addr + SOCK_FIFO_CONTROL);
697 writel(TIFM_FIFO_INTMASK,
698 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
699
700 if (r_data->flags & MMC_DATA_WRITE)
701 writel(TIFM_MMCSD_TXDE,
702 sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
703 else
704 writel(TIFM_MMCSD_RXDE,
705 sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
706
707 tifm_sd_set_dma_data(host, r_data);
708 }
709
710 writel(r_data->blocks - 1,
711 sock->addr + SOCK_MMCSD_NUM_BLOCKS);
712 writel(r_data->blksz - 1,
713 sock->addr + SOCK_MMCSD_BLOCK_LEN);
714 }
715
716 host->req = mrq;
717 mod_timer(&host->timer, jiffies + host->timeout_jiffies);
718 writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
719 sock->addr + SOCK_CONTROL);
720 tifm_sd_exec(host, mrq->cmd);
721 spin_unlock_irqrestore(&sock->lock, flags);
722 return;
723
724 err_out:
725 mrq->cmd->error = MMC_ERR_TIMEOUT;
726 mmc_request_done(mmc, mrq);
727 }
728
729 static void tifm_sd_end_cmd(unsigned long data)
730 {
731 struct tifm_sd *host = (struct tifm_sd*)data;
732 struct tifm_dev *sock = host->dev;
733 struct mmc_host *mmc = tifm_get_drvdata(sock);
734 struct mmc_request *mrq;
735 struct mmc_data *r_data = NULL;
736 unsigned long flags;
737
738 spin_lock_irqsave(&sock->lock, flags);
739
740 del_timer(&host->timer);
741 mrq = host->req;
742 host->req = NULL;
743
744 if (!mrq) {
745 printk(KERN_ERR " %s : no request to complete?\n",
746 sock->dev.bus_id);
747 spin_unlock_irqrestore(&sock->lock, flags);
748 return;
749 }
750
751 r_data = mrq->cmd->data;
752 if (r_data) {
753 if (host->no_dma) {
754 writel((~TIFM_MMCSD_BUFINT)
755 & readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
756 sock->addr + SOCK_MMCSD_INT_ENABLE);
757 } else {
758 tifm_unmap_sg(sock, &host->bounce_buf, 1,
759 (r_data->flags & MMC_DATA_WRITE)
760 ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
761 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
762 (r_data->flags & MMC_DATA_WRITE)
763 ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
764 }
765
766 r_data->bytes_xfered = r_data->blocks
767 - readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
768 r_data->bytes_xfered *= r_data->blksz;
769 r_data->bytes_xfered += r_data->blksz
770 - readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
771 }
772
773 writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
774 sock->addr + SOCK_CONTROL);
775
776 spin_unlock_irqrestore(&sock->lock, flags);
777 mmc_request_done(mmc, mrq);
778 }
779
780 static void tifm_sd_abort(unsigned long data)
781 {
782 struct tifm_sd *host = (struct tifm_sd*)data;
783
784 printk(KERN_ERR
785 "%s : card failed to respond for a long period of time "
786 "(%x, %x)\n",
787 host->dev->dev.bus_id, host->req->cmd->opcode, host->cmd_flags);
788
789 tifm_eject(host->dev);
790 }
791
792 static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
793 {
794 struct tifm_sd *host = mmc_priv(mmc);
795 struct tifm_dev *sock = host->dev;
796 unsigned int clk_div1, clk_div2;
797 unsigned long flags;
798
799 spin_lock_irqsave(&sock->lock, flags);
800
801 dev_dbg(&sock->dev, "ios: clock = %u, vdd = %x, bus_mode = %x, "
802 "chip_select = %x, power_mode = %x, bus_width = %x\n",
803 ios->clock, ios->vdd, ios->bus_mode, ios->chip_select,
804 ios->power_mode, ios->bus_width);
805
806 if (ios->bus_width == MMC_BUS_WIDTH_4) {
807 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
808 sock->addr + SOCK_MMCSD_CONFIG);
809 } else {
810 writel((~TIFM_MMCSD_4BBUS)
811 & readl(sock->addr + SOCK_MMCSD_CONFIG),
812 sock->addr + SOCK_MMCSD_CONFIG);
813 }
814
815 if (ios->clock) {
816 clk_div1 = 20000000 / ios->clock;
817 if (!clk_div1)
818 clk_div1 = 1;
819
820 clk_div2 = 24000000 / ios->clock;
821 if (!clk_div2)
822 clk_div2 = 1;
823
824 if ((20000000 / clk_div1) > ios->clock)
825 clk_div1++;
826 if ((24000000 / clk_div2) > ios->clock)
827 clk_div2++;
828 if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
829 host->clk_freq = 20000000;
830 host->clk_div = clk_div1;
831 writel((~TIFM_CTRL_FAST_CLK)
832 & readl(sock->addr + SOCK_CONTROL),
833 sock->addr + SOCK_CONTROL);
834 } else {
835 host->clk_freq = 24000000;
836 host->clk_div = clk_div2;
837 writel(TIFM_CTRL_FAST_CLK
838 | readl(sock->addr + SOCK_CONTROL),
839 sock->addr + SOCK_CONTROL);
840 }
841 } else {
842 host->clk_div = 0;
843 }
844 host->clk_div &= TIFM_MMCSD_CLKMASK;
845 writel(host->clk_div
846 | ((~TIFM_MMCSD_CLKMASK)
847 & readl(sock->addr + SOCK_MMCSD_CONFIG)),
848 sock->addr + SOCK_MMCSD_CONFIG);
849
850 host->open_drain = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN);
851
852 /* chip_select : maybe later */
853 //vdd
854 //power is set before probe / after remove
855
856 spin_unlock_irqrestore(&sock->lock, flags);
857 }
858
859 static int tifm_sd_ro(struct mmc_host *mmc)
860 {
861 int rc = 0;
862 struct tifm_sd *host = mmc_priv(mmc);
863 struct tifm_dev *sock = host->dev;
864 unsigned long flags;
865
866 spin_lock_irqsave(&sock->lock, flags);
867 if (TIFM_MMCSD_CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE))
868 rc = 1;
869 spin_unlock_irqrestore(&sock->lock, flags);
870 return rc;
871 }
872
873 static const struct mmc_host_ops tifm_sd_ops = {
874 .request = tifm_sd_request,
875 .set_ios = tifm_sd_ios,
876 .get_ro = tifm_sd_ro
877 };
878
879 static int tifm_sd_initialize_host(struct tifm_sd *host)
880 {
881 int rc;
882 unsigned int host_status = 0;
883 struct tifm_dev *sock = host->dev;
884
885 writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
886 mmiowb();
887 host->clk_div = 61;
888 host->clk_freq = 20000000;
889 writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
890 writel(host->clk_div | TIFM_MMCSD_POWER,
891 sock->addr + SOCK_MMCSD_CONFIG);
892
893 /* wait up to 0.51 sec for reset */
894 for (rc = 32; rc <= 256; rc <<= 1) {
895 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
896 rc = 0;
897 break;
898 }
899 msleep(rc);
900 }
901
902 if (rc) {
903 printk(KERN_ERR "%s : controller failed to reset\n",
904 sock->dev.bus_id);
905 return -ENODEV;
906 }
907
908 writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
909 writel(host->clk_div | TIFM_MMCSD_POWER,
910 sock->addr + SOCK_MMCSD_CONFIG);
911 writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
912
913 // command timeout fixed to 64 clocks for now
914 writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO);
915 writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
916
917 for (rc = 16; rc <= 64; rc <<= 1) {
918 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
919 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
920 if (!(host_status & TIFM_MMCSD_ERRMASK)
921 && (host_status & TIFM_MMCSD_EOC)) {
922 rc = 0;
923 break;
924 }
925 msleep(rc);
926 }
927
928 if (rc) {
929 printk(KERN_ERR
930 "%s : card not ready - probe failed on initialization\n",
931 sock->dev.bus_id);
932 return -ENODEV;
933 }
934
935 writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC
936 | TIFM_MMCSD_ERRMASK,
937 sock->addr + SOCK_MMCSD_INT_ENABLE);
938 mmiowb();
939
940 return 0;
941 }
942
943 static int tifm_sd_probe(struct tifm_dev *sock)
944 {
945 struct mmc_host *mmc;
946 struct tifm_sd *host;
947 int rc = -EIO;
948
949 if (!(TIFM_SOCK_STATE_OCCUPIED
950 & readl(sock->addr + SOCK_PRESENT_STATE))) {
951 printk(KERN_WARNING "%s : card gone, unexpectedly\n",
952 sock->dev.bus_id);
953 return rc;
954 }
955
956 mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
957 if (!mmc)
958 return -ENOMEM;
959
960 host = mmc_priv(mmc);
961 host->no_dma = no_dma;
962 tifm_set_drvdata(sock, mmc);
963 host->dev = sock;
964 host->timeout_jiffies = msecs_to_jiffies(1000);
965
966 tasklet_init(&host->finish_tasklet, tifm_sd_end_cmd,
967 (unsigned long)host);
968 setup_timer(&host->timer, tifm_sd_abort, (unsigned long)host);
969
970 mmc->ops = &tifm_sd_ops;
971 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
972 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE;
973 mmc->f_min = 20000000 / 60;
974 mmc->f_max = 24000000;
975
976 mmc->max_blk_count = 2048;
977 mmc->max_hw_segs = mmc->max_blk_count;
978 mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE);
979 mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size;
980 mmc->max_req_size = mmc->max_seg_size;
981 mmc->max_phys_segs = mmc->max_hw_segs;
982
983 sock->card_event = tifm_sd_card_event;
984 sock->data_event = tifm_sd_data_event;
985 rc = tifm_sd_initialize_host(host);
986
987 if (!rc)
988 rc = mmc_add_host(mmc);
989 if (!rc)
990 return 0;
991
992 mmc_free_host(mmc);
993 return rc;
994 }
995
996 static void tifm_sd_remove(struct tifm_dev *sock)
997 {
998 struct mmc_host *mmc = tifm_get_drvdata(sock);
999 struct tifm_sd *host = mmc_priv(mmc);
1000 unsigned long flags;
1001
1002 spin_lock_irqsave(&sock->lock, flags);
1003 host->eject = 1;
1004 writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
1005 mmiowb();
1006 spin_unlock_irqrestore(&sock->lock, flags);
1007
1008 tasklet_kill(&host->finish_tasklet);
1009
1010 spin_lock_irqsave(&sock->lock, flags);
1011 if (host->req) {
1012 writel(TIFM_FIFO_INT_SETALL,
1013 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
1014 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
1015 host->req->cmd->error = MMC_ERR_TIMEOUT;
1016 if (host->req->stop)
1017 host->req->stop->error = MMC_ERR_TIMEOUT;
1018 tasklet_schedule(&host->finish_tasklet);
1019 }
1020 spin_unlock_irqrestore(&sock->lock, flags);
1021 mmc_remove_host(mmc);
1022 dev_dbg(&sock->dev, "after remove\n");
1023
1024 /* The meaning of the bit majority in this constant is unknown. */
1025 writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
1026 sock->addr + SOCK_CONTROL);
1027
1028 mmc_free_host(mmc);
1029 }
1030
1031 #ifdef CONFIG_PM
1032
1033 static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
1034 {
1035 struct mmc_host *mmc = tifm_get_drvdata(sock);
1036 int rc;
1037
1038 rc = mmc_suspend_host(mmc, state);
1039 /* The meaning of the bit majority in this constant is unknown. */
1040 writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
1041 sock->addr + SOCK_CONTROL);
1042 return rc;
1043 }
1044
1045 static int tifm_sd_resume(struct tifm_dev *sock)
1046 {
1047 struct mmc_host *mmc = tifm_get_drvdata(sock);
1048 struct tifm_sd *host = mmc_priv(mmc);
1049 int rc;
1050
1051 rc = tifm_sd_initialize_host(host);
1052 dev_dbg(&sock->dev, "resume initialize %d\n", rc);
1053
1054 if (rc)
1055 host->eject = 1;
1056 else
1057 rc = mmc_resume_host(mmc);
1058
1059 return rc;
1060 }
1061
1062 #else
1063
1064 #define tifm_sd_suspend NULL
1065 #define tifm_sd_resume NULL
1066
1067 #endif /* CONFIG_PM */
1068
1069 static struct tifm_device_id tifm_sd_id_tbl[] = {
1070 { TIFM_TYPE_SD }, { }
1071 };
1072
1073 static struct tifm_driver tifm_sd_driver = {
1074 .driver = {
1075 .name = DRIVER_NAME,
1076 .owner = THIS_MODULE
1077 },
1078 .id_table = tifm_sd_id_tbl,
1079 .probe = tifm_sd_probe,
1080 .remove = tifm_sd_remove,
1081 .suspend = tifm_sd_suspend,
1082 .resume = tifm_sd_resume
1083 };
1084
1085 static int __init tifm_sd_init(void)
1086 {
1087 return tifm_register_driver(&tifm_sd_driver);
1088 }
1089
1090 static void __exit tifm_sd_exit(void)
1091 {
1092 tifm_unregister_driver(&tifm_sd_driver);
1093 }
1094
1095 MODULE_AUTHOR("Alex Dubov");
1096 MODULE_DESCRIPTION("TI FlashMedia SD driver");
1097 MODULE_LICENSE("GPL");
1098 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
1099 MODULE_VERSION(DRIVER_VERSION);
1100
1101 module_init(tifm_sd_init);
1102 module_exit(tifm_sd_exit);
Linux kernel - Deliverables
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