Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * tifm_sd.c - TI FlashMedia driver
4 *
5 * Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
6 *
7 * Special thanks to Brad Campbell for extensive testing of this driver.
8 */
9
10
11#include <linux/tifm.h>
12#include <linux/mmc/host.h>
13#include <linux/highmem.h>
14#include <linux/scatterlist.h>
15#include <linux/module.h>
16#include <linux/workqueue.h>
17#include <asm/io.h>
18
19#define DRIVER_NAME "tifm_sd"
20#define DRIVER_VERSION "0.8"
21
22static bool no_dma = 0;
23static bool fixed_timeout = 0;
24module_param(no_dma, bool, 0644);
25module_param(fixed_timeout, bool, 0644);
26
27/* Constants here are mostly from OMAP5912 datasheet */
28#define TIFM_MMCSD_RESET 0x0002
29#define TIFM_MMCSD_CLKMASK 0x03ff
30#define TIFM_MMCSD_POWER 0x0800
31#define TIFM_MMCSD_4BBUS 0x8000
32#define TIFM_MMCSD_RXDE 0x8000 /* rx dma enable */
33#define TIFM_MMCSD_TXDE 0x0080 /* tx dma enable */
34#define TIFM_MMCSD_BUFINT 0x0c00 /* set bits: AE, AF */
35#define TIFM_MMCSD_DPE 0x0020 /* data timeout counted in kilocycles */
36#define TIFM_MMCSD_INAB 0x0080 /* abort / initialize command */
37#define TIFM_MMCSD_READ 0x8000
38
39#define TIFM_MMCSD_ERRMASK 0x01e0 /* set bits: CCRC, CTO, DCRC, DTO */
40#define TIFM_MMCSD_EOC 0x0001 /* end of command phase */
41#define TIFM_MMCSD_CD 0x0002 /* card detect */
42#define TIFM_MMCSD_CB 0x0004 /* card enter busy state */
43#define TIFM_MMCSD_BRS 0x0008 /* block received/sent */
44#define TIFM_MMCSD_EOFB 0x0010 /* card exit busy state */
45#define TIFM_MMCSD_DTO 0x0020 /* data time-out */
46#define TIFM_MMCSD_DCRC 0x0040 /* data crc error */
47#define TIFM_MMCSD_CTO 0x0080 /* command time-out */
48#define TIFM_MMCSD_CCRC 0x0100 /* command crc error */
49#define TIFM_MMCSD_AF 0x0400 /* fifo almost full */
50#define TIFM_MMCSD_AE 0x0800 /* fifo almost empty */
51#define TIFM_MMCSD_OCRB 0x1000 /* OCR busy */
52#define TIFM_MMCSD_CIRQ 0x2000 /* card irq (cmd40/sdio) */
53#define TIFM_MMCSD_CERR 0x4000 /* card status error */
54
55#define TIFM_MMCSD_ODTO 0x0040 /* open drain / extended timeout */
56#define TIFM_MMCSD_CARD_RO 0x0200 /* card is read-only */
57
58#define TIFM_MMCSD_FIFO_SIZE 0x0020
59
60#define TIFM_MMCSD_RSP_R0 0x0000
61#define TIFM_MMCSD_RSP_R1 0x0100
62#define TIFM_MMCSD_RSP_R2 0x0200
63#define TIFM_MMCSD_RSP_R3 0x0300
64#define TIFM_MMCSD_RSP_R4 0x0400
65#define TIFM_MMCSD_RSP_R5 0x0500
66#define TIFM_MMCSD_RSP_R6 0x0600
67
68#define TIFM_MMCSD_RSP_BUSY 0x0800
69
70#define TIFM_MMCSD_CMD_BC 0x0000
71#define TIFM_MMCSD_CMD_BCR 0x1000
72#define TIFM_MMCSD_CMD_AC 0x2000
73#define TIFM_MMCSD_CMD_ADTC 0x3000
74
75#define TIFM_MMCSD_MAX_BLOCK_SIZE 0x0800UL
76
77#define TIFM_MMCSD_REQ_TIMEOUT_MS 1000
78
79enum {
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
89struct 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 work_struct finish_bh_work;
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 */
113static 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_local_page(pg) + 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_local(buf - off);
137}
138
139static 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_local_page(pg) + 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_local(buf - off);
164}
165
166static 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 && (host->cmd_flags & 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_page(&sg[host->sg_pos]), 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
210static 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_local_page(src) + src_off;
215 unsigned char *dst_buf = kmap_local_page(dst) + dst_off;
216
217 memcpy(dst_buf, src_buf, count);
218
219 kunmap_local(dst_buf - dst_off);
220 kunmap_local(src_buf - src_off);
221}
222
223static 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_page(&sg[host->sg_pos]), 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(sg_page(&host->bounce_buf),
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, sg_page(&host->bounce_buf),
255 r_data->blksz - t_size, p_cnt);
256
257 t_size -= p_cnt;
258 host->block_pos += p_cnt;
259 }
260}
261
262static 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
269 if (host->sg_pos == host->sg_len)
270 return 1;
271
272 if (host->cmd_flags & DATA_CARRY) {
273 host->cmd_flags &= ~DATA_CARRY;
274 tifm_sd_bounce_block(host, r_data);
275 if (host->sg_pos == host->sg_len)
276 return 1;
277 }
278
279 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]) - host->block_pos;
280 if (!dma_len) {
281 host->block_pos = 0;
282 host->sg_pos++;
283 if (host->sg_pos == host->sg_len)
284 return 1;
285 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]);
286 }
287
288 if (dma_len < t_size) {
289 dma_blk_cnt = dma_len / r_data->blksz;
290 dma_off = host->block_pos;
291 host->block_pos += dma_blk_cnt * r_data->blksz;
292 } else {
293 dma_blk_cnt = TIFM_DMA_TSIZE;
294 dma_off = host->block_pos;
295 host->block_pos += t_size;
296 }
297
298 if (dma_blk_cnt)
299 sg = &r_data->sg[host->sg_pos];
300 else if (dma_len) {
301 if (r_data->flags & MMC_DATA_WRITE)
302 tifm_sd_bounce_block(host, r_data);
303 else
304 host->cmd_flags |= DATA_CARRY;
305
306 sg = &host->bounce_buf;
307 dma_off = 0;
308 dma_blk_cnt = 1;
309 } else
310 return 1;
311
312 dev_dbg(&sock->dev, "setting dma for %d blocks\n", dma_blk_cnt);
313 writel(sg_dma_address(sg) + dma_off, sock->addr + SOCK_DMA_ADDRESS);
314 if (r_data->flags & MMC_DATA_WRITE)
315 writel((dma_blk_cnt << 8) | TIFM_DMA_TX | TIFM_DMA_EN,
316 sock->addr + SOCK_DMA_CONTROL);
317 else
318 writel((dma_blk_cnt << 8) | TIFM_DMA_EN,
319 sock->addr + SOCK_DMA_CONTROL);
320
321 return 0;
322}
323
324static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
325{
326 unsigned int rc = 0;
327
328 switch (mmc_resp_type(cmd)) {
329 case MMC_RSP_NONE:
330 rc |= TIFM_MMCSD_RSP_R0;
331 break;
332 case MMC_RSP_R1B:
333 rc |= TIFM_MMCSD_RSP_BUSY;
334 fallthrough;
335 case MMC_RSP_R1:
336 rc |= TIFM_MMCSD_RSP_R1;
337 break;
338 case MMC_RSP_R2:
339 rc |= TIFM_MMCSD_RSP_R2;
340 break;
341 case MMC_RSP_R3:
342 rc |= TIFM_MMCSD_RSP_R3;
343 break;
344 default:
345 BUG();
346 }
347
348 switch (mmc_cmd_type(cmd)) {
349 case MMC_CMD_BC:
350 rc |= TIFM_MMCSD_CMD_BC;
351 break;
352 case MMC_CMD_BCR:
353 rc |= TIFM_MMCSD_CMD_BCR;
354 break;
355 case MMC_CMD_AC:
356 rc |= TIFM_MMCSD_CMD_AC;
357 break;
358 case MMC_CMD_ADTC:
359 rc |= TIFM_MMCSD_CMD_ADTC;
360 break;
361 default:
362 BUG();
363 }
364 return rc;
365}
366
367static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
368{
369 struct tifm_dev *sock = host->dev;
370 unsigned int cmd_mask = tifm_sd_op_flags(cmd);
371
372 if (host->open_drain)
373 cmd_mask |= TIFM_MMCSD_ODTO;
374
375 if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
376 cmd_mask |= TIFM_MMCSD_READ;
377
378 dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
379 cmd->opcode, cmd->arg, cmd_mask);
380
381 writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
382 writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
383 writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
384}
385
386static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
387{
388 cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
389 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
390 cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
391 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
392 cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
393 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
394 cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
395 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
396}
397
398static void tifm_sd_check_status(struct tifm_sd *host)
399{
400 struct tifm_dev *sock = host->dev;
401 struct mmc_command *cmd = host->req->cmd;
402
403 if (cmd->error)
404 goto finish_request;
405
406 if (!(host->cmd_flags & CMD_READY))
407 return;
408
409 if (cmd->data) {
410 if (cmd->data->error) {
411 if ((host->cmd_flags & SCMD_ACTIVE)
412 && !(host->cmd_flags & SCMD_READY))
413 return;
414
415 goto finish_request;
416 }
417
418 if (!(host->cmd_flags & BRS_READY))
419 return;
420
421 if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
422 return;
423
424 if (cmd->data->flags & MMC_DATA_WRITE) {
425 if (host->req->stop) {
426 if (!(host->cmd_flags & SCMD_ACTIVE)) {
427 host->cmd_flags |= SCMD_ACTIVE;
428 writel(TIFM_MMCSD_EOFB
429 | readl(sock->addr
430 + SOCK_MMCSD_INT_ENABLE),
431 sock->addr
432 + SOCK_MMCSD_INT_ENABLE);
433 tifm_sd_exec(host, host->req->stop);
434 return;
435 } else {
436 if (!(host->cmd_flags & SCMD_READY)
437 || (host->cmd_flags & CARD_BUSY))
438 return;
439 writel((~TIFM_MMCSD_EOFB)
440 & readl(sock->addr
441 + SOCK_MMCSD_INT_ENABLE),
442 sock->addr
443 + SOCK_MMCSD_INT_ENABLE);
444 }
445 } else {
446 if (host->cmd_flags & CARD_BUSY)
447 return;
448 writel((~TIFM_MMCSD_EOFB)
449 & readl(sock->addr
450 + SOCK_MMCSD_INT_ENABLE),
451 sock->addr + SOCK_MMCSD_INT_ENABLE);
452 }
453 } else {
454 if (host->req->stop) {
455 if (!(host->cmd_flags & SCMD_ACTIVE)) {
456 host->cmd_flags |= SCMD_ACTIVE;
457 tifm_sd_exec(host, host->req->stop);
458 return;
459 } else {
460 if (!(host->cmd_flags & SCMD_READY))
461 return;
462 }
463 }
464 }
465 }
466finish_request:
467 queue_work(system_bh_wq, &host->finish_bh_work);
468}
469
470/* Called from interrupt handler */
471static void tifm_sd_data_event(struct tifm_dev *sock)
472{
473 struct tifm_sd *host;
474 unsigned int fifo_status = 0;
475 struct mmc_data *r_data = NULL;
476
477 spin_lock(&sock->lock);
478 host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
479 fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
480 dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
481 fifo_status, host->cmd_flags);
482
483 if (host->req) {
484 r_data = host->req->cmd->data;
485
486 if (r_data && (fifo_status & TIFM_FIFO_READY)) {
487 if (tifm_sd_set_dma_data(host, r_data)) {
488 host->cmd_flags |= FIFO_READY;
489 tifm_sd_check_status(host);
490 }
491 }
492 }
493
494 writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
495 spin_unlock(&sock->lock);
496}
497
498/* Called from interrupt handler */
499static void tifm_sd_card_event(struct tifm_dev *sock)
500{
501 struct tifm_sd *host;
502 unsigned int host_status = 0;
503 int cmd_error = 0;
504 struct mmc_command *cmd = NULL;
505
506 spin_lock(&sock->lock);
507 host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
508 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
509 dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
510 host_status, host->cmd_flags);
511
512 if (host->req) {
513 cmd = host->req->cmd;
514
515 if (host_status & TIFM_MMCSD_ERRMASK) {
516 writel(host_status & TIFM_MMCSD_ERRMASK,
517 sock->addr + SOCK_MMCSD_STATUS);
518 if (host_status & TIFM_MMCSD_CTO)
519 cmd_error = -ETIMEDOUT;
520 else if (host_status & TIFM_MMCSD_CCRC)
521 cmd_error = -EILSEQ;
522
523 if (cmd->data) {
524 if (host_status & TIFM_MMCSD_DTO)
525 cmd->data->error = -ETIMEDOUT;
526 else if (host_status & TIFM_MMCSD_DCRC)
527 cmd->data->error = -EILSEQ;
528 }
529
530 writel(TIFM_FIFO_INT_SETALL,
531 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
532 writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
533
534 if (host->req->stop) {
535 if (host->cmd_flags & SCMD_ACTIVE) {
536 host->req->stop->error = cmd_error;
537 host->cmd_flags |= SCMD_READY;
538 } else {
539 cmd->error = cmd_error;
540 host->cmd_flags |= SCMD_ACTIVE;
541 tifm_sd_exec(host, host->req->stop);
542 goto done;
543 }
544 } else
545 cmd->error = cmd_error;
546 } else {
547 if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
548 if (!(host->cmd_flags & CMD_READY)) {
549 host->cmd_flags |= CMD_READY;
550 tifm_sd_fetch_resp(cmd, sock);
551 } else if (host->cmd_flags & SCMD_ACTIVE) {
552 host->cmd_flags |= SCMD_READY;
553 tifm_sd_fetch_resp(host->req->stop,
554 sock);
555 }
556 }
557 if (host_status & TIFM_MMCSD_BRS)
558 host->cmd_flags |= BRS_READY;
559 }
560
561 if (host->no_dma && cmd->data) {
562 if (host_status & TIFM_MMCSD_AE)
563 writel(host_status & TIFM_MMCSD_AE,
564 sock->addr + SOCK_MMCSD_STATUS);
565
566 if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
567 | TIFM_MMCSD_BRS)) {
568 tifm_sd_transfer_data(host);
569 host_status &= ~TIFM_MMCSD_AE;
570 }
571 }
572
573 if (host_status & TIFM_MMCSD_EOFB)
574 host->cmd_flags &= ~CARD_BUSY;
575 else if (host_status & TIFM_MMCSD_CB)
576 host->cmd_flags |= CARD_BUSY;
577
578 tifm_sd_check_status(host);
579 }
580done:
581 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
582 spin_unlock(&sock->lock);
583}
584
585static void tifm_sd_set_data_timeout(struct tifm_sd *host,
586 struct mmc_data *data)
587{
588 struct tifm_dev *sock = host->dev;
589 unsigned int data_timeout = data->timeout_clks;
590
591 if (fixed_timeout)
592 return;
593
594 data_timeout += data->timeout_ns /
595 ((1000000000UL / host->clk_freq) * host->clk_div);
596
597 if (data_timeout < 0xffff) {
598 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
599 writel((~TIFM_MMCSD_DPE)
600 & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
601 sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
602 } else {
603 data_timeout = (data_timeout >> 10) + 1;
604 if (data_timeout > 0xffff)
605 data_timeout = 0; /* set to unlimited */
606 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
607 writel(TIFM_MMCSD_DPE
608 | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
609 sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
610 }
611}
612
613static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
614{
615 struct tifm_sd *host = mmc_priv(mmc);
616 struct tifm_dev *sock = host->dev;
617 unsigned long flags;
618 struct mmc_data *r_data = mrq->cmd->data;
619
620 spin_lock_irqsave(&sock->lock, flags);
621 if (host->eject) {
622 mrq->cmd->error = -ENOMEDIUM;
623 goto err_out;
624 }
625
626 if (host->req) {
627 pr_err("%s : unfinished request detected\n",
628 dev_name(&sock->dev));
629 mrq->cmd->error = -ETIMEDOUT;
630 goto err_out;
631 }
632
633 host->cmd_flags = 0;
634 host->block_pos = 0;
635 host->sg_pos = 0;
636
637 if (mrq->data && !is_power_of_2(mrq->data->blksz))
638 host->no_dma = 1;
639 else
640 host->no_dma = no_dma ? 1 : 0;
641
642 if (r_data) {
643 tifm_sd_set_data_timeout(host, r_data);
644
645 if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop)
646 writel(TIFM_MMCSD_EOFB
647 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
648 sock->addr + SOCK_MMCSD_INT_ENABLE);
649
650 if (host->no_dma) {
651 writel(TIFM_MMCSD_BUFINT
652 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
653 sock->addr + SOCK_MMCSD_INT_ENABLE);
654 writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
655 | (TIFM_MMCSD_FIFO_SIZE - 1),
656 sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
657
658 host->sg_len = r_data->sg_len;
659 } else {
660 sg_init_one(&host->bounce_buf, host->bounce_buf_data,
661 r_data->blksz);
662
663 if(1 != tifm_map_sg(sock, &host->bounce_buf, 1,
664 r_data->flags & MMC_DATA_WRITE
665 ? DMA_TO_DEVICE
666 : DMA_FROM_DEVICE)) {
667 pr_err("%s : scatterlist map failed\n",
668 dev_name(&sock->dev));
669 mrq->cmd->error = -ENOMEM;
670 goto err_out;
671 }
672 host->sg_len = tifm_map_sg(sock, r_data->sg,
673 r_data->sg_len,
674 r_data->flags
675 & MMC_DATA_WRITE
676 ? DMA_TO_DEVICE
677 : DMA_FROM_DEVICE);
678 if (host->sg_len < 1) {
679 pr_err("%s : scatterlist map failed\n",
680 dev_name(&sock->dev));
681 tifm_unmap_sg(sock, &host->bounce_buf, 1,
682 r_data->flags & MMC_DATA_WRITE
683 ? DMA_TO_DEVICE
684 : DMA_FROM_DEVICE);
685 mrq->cmd->error = -ENOMEM;
686 goto err_out;
687 }
688
689 writel(TIFM_FIFO_INT_SETALL,
690 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
691 writel(ilog2(r_data->blksz) - 2,
692 sock->addr + SOCK_FIFO_PAGE_SIZE);
693 writel(TIFM_FIFO_ENABLE,
694 sock->addr + SOCK_FIFO_CONTROL);
695 writel(TIFM_FIFO_INTMASK,
696 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
697
698 if (r_data->flags & MMC_DATA_WRITE)
699 writel(TIFM_MMCSD_TXDE,
700 sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
701 else
702 writel(TIFM_MMCSD_RXDE,
703 sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
704
705 tifm_sd_set_dma_data(host, r_data);
706 }
707
708 writel(r_data->blocks - 1,
709 sock->addr + SOCK_MMCSD_NUM_BLOCKS);
710 writel(r_data->blksz - 1,
711 sock->addr + SOCK_MMCSD_BLOCK_LEN);
712 }
713
714 host->req = mrq;
715 mod_timer(&host->timer, jiffies + host->timeout_jiffies);
716 writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
717 sock->addr + SOCK_CONTROL);
718 tifm_sd_exec(host, mrq->cmd);
719 spin_unlock_irqrestore(&sock->lock, flags);
720 return;
721
722err_out:
723 spin_unlock_irqrestore(&sock->lock, flags);
724 mmc_request_done(mmc, mrq);
725}
726
727static void tifm_sd_end_cmd(struct work_struct *t)
728{
729 struct tifm_sd *host = from_work(host, t, finish_bh_work);
730 struct tifm_dev *sock = host->dev;
731 struct mmc_host *mmc = tifm_get_drvdata(sock);
732 struct mmc_request *mrq;
733 struct mmc_data *r_data = NULL;
734 unsigned long flags;
735
736 spin_lock_irqsave(&sock->lock, flags);
737
738 del_timer(&host->timer);
739 mrq = host->req;
740 host->req = NULL;
741
742 if (!mrq) {
743 pr_err(" %s : no request to complete?\n",
744 dev_name(&sock->dev));
745 spin_unlock_irqrestore(&sock->lock, flags);
746 return;
747 }
748
749 r_data = mrq->cmd->data;
750 if (r_data) {
751 if (host->no_dma) {
752 writel((~TIFM_MMCSD_BUFINT)
753 & readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
754 sock->addr + SOCK_MMCSD_INT_ENABLE);
755 } else {
756 tifm_unmap_sg(sock, &host->bounce_buf, 1,
757 (r_data->flags & MMC_DATA_WRITE)
758 ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
759 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
760 (r_data->flags & MMC_DATA_WRITE)
761 ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
762 }
763
764 r_data->bytes_xfered = r_data->blocks
765 - readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
766 r_data->bytes_xfered *= r_data->blksz;
767 r_data->bytes_xfered += r_data->blksz
768 - readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
769 }
770
771 writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
772 sock->addr + SOCK_CONTROL);
773
774 spin_unlock_irqrestore(&sock->lock, flags);
775 mmc_request_done(mmc, mrq);
776}
777
778static void tifm_sd_abort(struct timer_list *t)
779{
780 struct tifm_sd *host = from_timer(host, t, timer);
781
782 pr_err("%s : card failed to respond for a long period of time "
783 "(%x, %x)\n",
784 dev_name(&host->dev->dev), host->req->cmd->opcode, host->cmd_flags);
785
786 tifm_eject(host->dev);
787}
788
789static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
790{
791 struct tifm_sd *host = mmc_priv(mmc);
792 struct tifm_dev *sock = host->dev;
793 unsigned int clk_div1, clk_div2;
794 unsigned long flags;
795
796 spin_lock_irqsave(&sock->lock, flags);
797
798 dev_dbg(&sock->dev, "ios: clock = %u, vdd = %x, bus_mode = %x, "
799 "chip_select = %x, power_mode = %x, bus_width = %x\n",
800 ios->clock, ios->vdd, ios->bus_mode, ios->chip_select,
801 ios->power_mode, ios->bus_width);
802
803 if (ios->bus_width == MMC_BUS_WIDTH_4) {
804 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
805 sock->addr + SOCK_MMCSD_CONFIG);
806 } else {
807 writel((~TIFM_MMCSD_4BBUS)
808 & readl(sock->addr + SOCK_MMCSD_CONFIG),
809 sock->addr + SOCK_MMCSD_CONFIG);
810 }
811
812 if (ios->clock) {
813 clk_div1 = 20000000 / ios->clock;
814 if (!clk_div1)
815 clk_div1 = 1;
816
817 clk_div2 = 24000000 / ios->clock;
818 if (!clk_div2)
819 clk_div2 = 1;
820
821 if ((20000000 / clk_div1) > ios->clock)
822 clk_div1++;
823 if ((24000000 / clk_div2) > ios->clock)
824 clk_div2++;
825 if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
826 host->clk_freq = 20000000;
827 host->clk_div = clk_div1;
828 writel((~TIFM_CTRL_FAST_CLK)
829 & readl(sock->addr + SOCK_CONTROL),
830 sock->addr + SOCK_CONTROL);
831 } else {
832 host->clk_freq = 24000000;
833 host->clk_div = clk_div2;
834 writel(TIFM_CTRL_FAST_CLK
835 | readl(sock->addr + SOCK_CONTROL),
836 sock->addr + SOCK_CONTROL);
837 }
838 } else {
839 host->clk_div = 0;
840 }
841 host->clk_div &= TIFM_MMCSD_CLKMASK;
842 writel(host->clk_div
843 | ((~TIFM_MMCSD_CLKMASK)
844 & readl(sock->addr + SOCK_MMCSD_CONFIG)),
845 sock->addr + SOCK_MMCSD_CONFIG);
846
847 host->open_drain = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN);
848
849 /* chip_select : maybe later */
850 //vdd
851 //power is set before probe / after remove
852
853 spin_unlock_irqrestore(&sock->lock, flags);
854}
855
856static int tifm_sd_ro(struct mmc_host *mmc)
857{
858 int rc = 0;
859 struct tifm_sd *host = mmc_priv(mmc);
860 struct tifm_dev *sock = host->dev;
861 unsigned long flags;
862
863 spin_lock_irqsave(&sock->lock, flags);
864 if (TIFM_MMCSD_CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE))
865 rc = 1;
866 spin_unlock_irqrestore(&sock->lock, flags);
867 return rc;
868}
869
870static const struct mmc_host_ops tifm_sd_ops = {
871 .request = tifm_sd_request,
872 .set_ios = tifm_sd_ios,
873 .get_ro = tifm_sd_ro
874};
875
876static int tifm_sd_initialize_host(struct tifm_sd *host)
877{
878 int rc;
879 unsigned int host_status = 0;
880 struct tifm_dev *sock = host->dev;
881
882 writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
883 host->clk_div = 61;
884 host->clk_freq = 20000000;
885 writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
886 writel(host->clk_div | TIFM_MMCSD_POWER,
887 sock->addr + SOCK_MMCSD_CONFIG);
888
889 /* wait up to 0.51 sec for reset */
890 for (rc = 32; rc <= 256; rc <<= 1) {
891 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
892 rc = 0;
893 break;
894 }
895 msleep(rc);
896 }
897
898 if (rc) {
899 pr_err("%s : controller failed to reset\n",
900 dev_name(&sock->dev));
901 return -ENODEV;
902 }
903
904 writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
905 writel(host->clk_div | TIFM_MMCSD_POWER,
906 sock->addr + SOCK_MMCSD_CONFIG);
907 writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
908
909 // command timeout fixed to 64 clocks for now
910 writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO);
911 writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
912
913 for (rc = 16; rc <= 64; rc <<= 1) {
914 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
915 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
916 if (!(host_status & TIFM_MMCSD_ERRMASK)
917 && (host_status & TIFM_MMCSD_EOC)) {
918 rc = 0;
919 break;
920 }
921 msleep(rc);
922 }
923
924 if (rc) {
925 pr_err("%s : card not ready - probe failed on initialization\n",
926 dev_name(&sock->dev));
927 return -ENODEV;
928 }
929
930 writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC
931 | TIFM_MMCSD_ERRMASK,
932 sock->addr + SOCK_MMCSD_INT_ENABLE);
933
934 return 0;
935}
936
937static int tifm_sd_probe(struct tifm_dev *sock)
938{
939 struct mmc_host *mmc;
940 struct tifm_sd *host;
941 int rc = -EIO;
942
943 if (!(TIFM_SOCK_STATE_OCCUPIED
944 & readl(sock->addr + SOCK_PRESENT_STATE))) {
945 pr_warn("%s : card gone, unexpectedly\n",
946 dev_name(&sock->dev));
947 return rc;
948 }
949
950 mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
951 if (!mmc)
952 return -ENOMEM;
953
954 host = mmc_priv(mmc);
955 tifm_set_drvdata(sock, mmc);
956 host->dev = sock;
957 host->timeout_jiffies = msecs_to_jiffies(TIFM_MMCSD_REQ_TIMEOUT_MS);
958 /*
959 * We use a fixed request timeout of 1s, hence inform the core about it.
960 * A future improvement should instead respect the cmd->busy_timeout.
961 */
962 mmc->max_busy_timeout = TIFM_MMCSD_REQ_TIMEOUT_MS;
963
964 INIT_WORK(&host->finish_bh_work, tifm_sd_end_cmd);
965 timer_setup(&host->timer, tifm_sd_abort, 0);
966
967 mmc->ops = &tifm_sd_ops;
968 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
969 mmc->caps = MMC_CAP_4_BIT_DATA;
970 mmc->f_min = 20000000 / 60;
971 mmc->f_max = 24000000;
972
973 mmc->max_blk_count = 2048;
974 mmc->max_segs = mmc->max_blk_count;
975 mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE);
976 mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size;
977 mmc->max_req_size = mmc->max_seg_size;
978
979 sock->card_event = tifm_sd_card_event;
980 sock->data_event = tifm_sd_data_event;
981 rc = tifm_sd_initialize_host(host);
982
983 if (!rc)
984 rc = mmc_add_host(mmc);
985 if (!rc)
986 return 0;
987
988 mmc_free_host(mmc);
989 return rc;
990}
991
992static void tifm_sd_remove(struct tifm_dev *sock)
993{
994 struct mmc_host *mmc = tifm_get_drvdata(sock);
995 struct tifm_sd *host = mmc_priv(mmc);
996 unsigned long flags;
997
998 spin_lock_irqsave(&sock->lock, flags);
999 host->eject = 1;
1000 writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
1001 spin_unlock_irqrestore(&sock->lock, flags);
1002
1003 cancel_work_sync(&host->finish_bh_work);
1004
1005 spin_lock_irqsave(&sock->lock, flags);
1006 if (host->req) {
1007 writel(TIFM_FIFO_INT_SETALL,
1008 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
1009 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
1010 host->req->cmd->error = -ENOMEDIUM;
1011 if (host->req->stop)
1012 host->req->stop->error = -ENOMEDIUM;
1013 queue_work(system_bh_wq, &host->finish_bh_work);
1014 }
1015 spin_unlock_irqrestore(&sock->lock, flags);
1016 mmc_remove_host(mmc);
1017 dev_dbg(&sock->dev, "after remove\n");
1018
1019 mmc_free_host(mmc);
1020}
1021
1022#ifdef CONFIG_PM
1023
1024static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
1025{
1026 return 0;
1027}
1028
1029static int tifm_sd_resume(struct tifm_dev *sock)
1030{
1031 struct mmc_host *mmc = tifm_get_drvdata(sock);
1032 struct tifm_sd *host = mmc_priv(mmc);
1033 int rc;
1034
1035 rc = tifm_sd_initialize_host(host);
1036 dev_dbg(&sock->dev, "resume initialize %d\n", rc);
1037
1038 if (rc)
1039 host->eject = 1;
1040
1041 return rc;
1042}
1043
1044#else
1045
1046#define tifm_sd_suspend NULL
1047#define tifm_sd_resume NULL
1048
1049#endif /* CONFIG_PM */
1050
1051static struct tifm_device_id tifm_sd_id_tbl[] = {
1052 { TIFM_TYPE_SD }, { }
1053};
1054
1055static struct tifm_driver tifm_sd_driver = {
1056 .driver = {
1057 .name = DRIVER_NAME,
1058 .owner = THIS_MODULE
1059 },
1060 .id_table = tifm_sd_id_tbl,
1061 .probe = tifm_sd_probe,
1062 .remove = tifm_sd_remove,
1063 .suspend = tifm_sd_suspend,
1064 .resume = tifm_sd_resume
1065};
1066
1067static int __init tifm_sd_init(void)
1068{
1069 return tifm_register_driver(&tifm_sd_driver);
1070}
1071
1072static void __exit tifm_sd_exit(void)
1073{
1074 tifm_unregister_driver(&tifm_sd_driver);
1075}
1076
1077MODULE_AUTHOR("Alex Dubov");
1078MODULE_DESCRIPTION("TI FlashMedia SD driver");
1079MODULE_LICENSE("GPL");
1080MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
1081MODULE_VERSION(DRIVER_VERSION);
1082
1083module_init(tifm_sd_init);
1084module_exit(tifm_sd_exit);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * tifm_sd.c - TI FlashMedia driver
4 *
5 * Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
6 *
7 * Special thanks to Brad Campbell for extensive testing of this driver.
8 */
9
10
11#include <linux/tifm.h>
12#include <linux/mmc/host.h>
13#include <linux/highmem.h>
14#include <linux/scatterlist.h>
15#include <linux/module.h>
16#include <asm/io.h>
17
18#define DRIVER_NAME "tifm_sd"
19#define DRIVER_VERSION "0.8"
20
21static bool no_dma = 0;
22static bool fixed_timeout = 0;
23module_param(no_dma, bool, 0644);
24module_param(fixed_timeout, bool, 0644);
25
26/* Constants here are mostly from OMAP5912 datasheet */
27#define TIFM_MMCSD_RESET 0x0002
28#define TIFM_MMCSD_CLKMASK 0x03ff
29#define TIFM_MMCSD_POWER 0x0800
30#define TIFM_MMCSD_4BBUS 0x8000
31#define TIFM_MMCSD_RXDE 0x8000 /* rx dma enable */
32#define TIFM_MMCSD_TXDE 0x0080 /* tx dma enable */
33#define TIFM_MMCSD_BUFINT 0x0c00 /* set bits: AE, AF */
34#define TIFM_MMCSD_DPE 0x0020 /* data timeout counted in kilocycles */
35#define TIFM_MMCSD_INAB 0x0080 /* abort / initialize command */
36#define TIFM_MMCSD_READ 0x8000
37
38#define TIFM_MMCSD_ERRMASK 0x01e0 /* set bits: CCRC, CTO, DCRC, DTO */
39#define TIFM_MMCSD_EOC 0x0001 /* end of command phase */
40#define TIFM_MMCSD_CD 0x0002 /* card detect */
41#define TIFM_MMCSD_CB 0x0004 /* card enter busy state */
42#define TIFM_MMCSD_BRS 0x0008 /* block received/sent */
43#define TIFM_MMCSD_EOFB 0x0010 /* card exit busy state */
44#define TIFM_MMCSD_DTO 0x0020 /* data time-out */
45#define TIFM_MMCSD_DCRC 0x0040 /* data crc error */
46#define TIFM_MMCSD_CTO 0x0080 /* command time-out */
47#define TIFM_MMCSD_CCRC 0x0100 /* command crc error */
48#define TIFM_MMCSD_AF 0x0400 /* fifo almost full */
49#define TIFM_MMCSD_AE 0x0800 /* fifo almost empty */
50#define TIFM_MMCSD_OCRB 0x1000 /* OCR busy */
51#define TIFM_MMCSD_CIRQ 0x2000 /* card irq (cmd40/sdio) */
52#define TIFM_MMCSD_CERR 0x4000 /* card status error */
53
54#define TIFM_MMCSD_ODTO 0x0040 /* open drain / extended timeout */
55#define TIFM_MMCSD_CARD_RO 0x0200 /* card is read-only */
56
57#define TIFM_MMCSD_FIFO_SIZE 0x0020
58
59#define TIFM_MMCSD_RSP_R0 0x0000
60#define TIFM_MMCSD_RSP_R1 0x0100
61#define TIFM_MMCSD_RSP_R2 0x0200
62#define TIFM_MMCSD_RSP_R3 0x0300
63#define TIFM_MMCSD_RSP_R4 0x0400
64#define TIFM_MMCSD_RSP_R5 0x0500
65#define TIFM_MMCSD_RSP_R6 0x0600
66
67#define TIFM_MMCSD_RSP_BUSY 0x0800
68
69#define TIFM_MMCSD_CMD_BC 0x0000
70#define TIFM_MMCSD_CMD_BCR 0x1000
71#define TIFM_MMCSD_CMD_AC 0x2000
72#define TIFM_MMCSD_CMD_ADTC 0x3000
73
74#define TIFM_MMCSD_MAX_BLOCK_SIZE 0x0800UL
75
76#define TIFM_MMCSD_REQ_TIMEOUT_MS 1000
77
78enum {
79 CMD_READY = 0x0001,
80 FIFO_READY = 0x0002,
81 BRS_READY = 0x0004,
82 SCMD_ACTIVE = 0x0008,
83 SCMD_READY = 0x0010,
84 CARD_BUSY = 0x0020,
85 DATA_CARRY = 0x0040
86};
87
88struct tifm_sd {
89 struct tifm_dev *dev;
90
91 unsigned short eject:1,
92 open_drain:1,
93 no_dma:1;
94 unsigned short cmd_flags;
95
96 unsigned int clk_freq;
97 unsigned int clk_div;
98 unsigned long timeout_jiffies;
99
100 struct tasklet_struct finish_tasklet;
101 struct timer_list timer;
102 struct mmc_request *req;
103
104 int sg_len;
105 int sg_pos;
106 unsigned int block_pos;
107 struct scatterlist bounce_buf;
108 unsigned char bounce_buf_data[TIFM_MMCSD_MAX_BLOCK_SIZE];
109};
110
111/* for some reason, host won't respond correctly to readw/writew */
112static void tifm_sd_read_fifo(struct tifm_sd *host, struct page *pg,
113 unsigned int off, unsigned int cnt)
114{
115 struct tifm_dev *sock = host->dev;
116 unsigned char *buf;
117 unsigned int pos = 0, val;
118
119 buf = kmap_local_page(pg) + off;
120 if (host->cmd_flags & DATA_CARRY) {
121 buf[pos++] = host->bounce_buf_data[0];
122 host->cmd_flags &= ~DATA_CARRY;
123 }
124
125 while (pos < cnt) {
126 val = readl(sock->addr + SOCK_MMCSD_DATA);
127 buf[pos++] = val & 0xff;
128 if (pos == cnt) {
129 host->bounce_buf_data[0] = (val >> 8) & 0xff;
130 host->cmd_flags |= DATA_CARRY;
131 break;
132 }
133 buf[pos++] = (val >> 8) & 0xff;
134 }
135 kunmap_local(buf - off);
136}
137
138static void tifm_sd_write_fifo(struct tifm_sd *host, struct page *pg,
139 unsigned int off, unsigned int cnt)
140{
141 struct tifm_dev *sock = host->dev;
142 unsigned char *buf;
143 unsigned int pos = 0, val;
144
145 buf = kmap_local_page(pg) + off;
146 if (host->cmd_flags & DATA_CARRY) {
147 val = host->bounce_buf_data[0] | ((buf[pos++] << 8) & 0xff00);
148 writel(val, sock->addr + SOCK_MMCSD_DATA);
149 host->cmd_flags &= ~DATA_CARRY;
150 }
151
152 while (pos < cnt) {
153 val = buf[pos++];
154 if (pos == cnt) {
155 host->bounce_buf_data[0] = val & 0xff;
156 host->cmd_flags |= DATA_CARRY;
157 break;
158 }
159 val |= (buf[pos++] << 8) & 0xff00;
160 writel(val, sock->addr + SOCK_MMCSD_DATA);
161 }
162 kunmap_local(buf - off);
163}
164
165static void tifm_sd_transfer_data(struct tifm_sd *host)
166{
167 struct mmc_data *r_data = host->req->cmd->data;
168 struct scatterlist *sg = r_data->sg;
169 unsigned int off, cnt, t_size = TIFM_MMCSD_FIFO_SIZE * 2;
170 unsigned int p_off, p_cnt;
171 struct page *pg;
172
173 if (host->sg_pos == host->sg_len)
174 return;
175 while (t_size) {
176 cnt = sg[host->sg_pos].length - host->block_pos;
177 if (!cnt) {
178 host->block_pos = 0;
179 host->sg_pos++;
180 if (host->sg_pos == host->sg_len) {
181 if ((r_data->flags & MMC_DATA_WRITE)
182 && (host->cmd_flags & DATA_CARRY))
183 writel(host->bounce_buf_data[0],
184 host->dev->addr
185 + SOCK_MMCSD_DATA);
186
187 return;
188 }
189 cnt = sg[host->sg_pos].length;
190 }
191 off = sg[host->sg_pos].offset + host->block_pos;
192
193 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
194 p_off = offset_in_page(off);
195 p_cnt = PAGE_SIZE - p_off;
196 p_cnt = min(p_cnt, cnt);
197 p_cnt = min(p_cnt, t_size);
198
199 if (r_data->flags & MMC_DATA_READ)
200 tifm_sd_read_fifo(host, pg, p_off, p_cnt);
201 else if (r_data->flags & MMC_DATA_WRITE)
202 tifm_sd_write_fifo(host, pg, p_off, p_cnt);
203
204 t_size -= p_cnt;
205 host->block_pos += p_cnt;
206 }
207}
208
209static void tifm_sd_copy_page(struct page *dst, unsigned int dst_off,
210 struct page *src, unsigned int src_off,
211 unsigned int count)
212{
213 unsigned char *src_buf = kmap_local_page(src) + src_off;
214 unsigned char *dst_buf = kmap_local_page(dst) + dst_off;
215
216 memcpy(dst_buf, src_buf, count);
217
218 kunmap_local(dst_buf - dst_off);
219 kunmap_local(src_buf - src_off);
220}
221
222static void tifm_sd_bounce_block(struct tifm_sd *host, struct mmc_data *r_data)
223{
224 struct scatterlist *sg = r_data->sg;
225 unsigned int t_size = r_data->blksz;
226 unsigned int off, cnt;
227 unsigned int p_off, p_cnt;
228 struct page *pg;
229
230 dev_dbg(&host->dev->dev, "bouncing block\n");
231 while (t_size) {
232 cnt = sg[host->sg_pos].length - host->block_pos;
233 if (!cnt) {
234 host->block_pos = 0;
235 host->sg_pos++;
236 if (host->sg_pos == host->sg_len)
237 return;
238 cnt = sg[host->sg_pos].length;
239 }
240 off = sg[host->sg_pos].offset + host->block_pos;
241
242 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
243 p_off = offset_in_page(off);
244 p_cnt = PAGE_SIZE - p_off;
245 p_cnt = min(p_cnt, cnt);
246 p_cnt = min(p_cnt, t_size);
247
248 if (r_data->flags & MMC_DATA_WRITE)
249 tifm_sd_copy_page(sg_page(&host->bounce_buf),
250 r_data->blksz - t_size,
251 pg, p_off, p_cnt);
252 else if (r_data->flags & MMC_DATA_READ)
253 tifm_sd_copy_page(pg, p_off, sg_page(&host->bounce_buf),
254 r_data->blksz - t_size, p_cnt);
255
256 t_size -= p_cnt;
257 host->block_pos += p_cnt;
258 }
259}
260
261static int tifm_sd_set_dma_data(struct tifm_sd *host, struct mmc_data *r_data)
262{
263 struct tifm_dev *sock = host->dev;
264 unsigned int t_size = TIFM_DMA_TSIZE * r_data->blksz;
265 unsigned int dma_len, dma_blk_cnt, dma_off;
266 struct scatterlist *sg = NULL;
267
268 if (host->sg_pos == host->sg_len)
269 return 1;
270
271 if (host->cmd_flags & DATA_CARRY) {
272 host->cmd_flags &= ~DATA_CARRY;
273 tifm_sd_bounce_block(host, r_data);
274 if (host->sg_pos == host->sg_len)
275 return 1;
276 }
277
278 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]) - host->block_pos;
279 if (!dma_len) {
280 host->block_pos = 0;
281 host->sg_pos++;
282 if (host->sg_pos == host->sg_len)
283 return 1;
284 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]);
285 }
286
287 if (dma_len < t_size) {
288 dma_blk_cnt = dma_len / r_data->blksz;
289 dma_off = host->block_pos;
290 host->block_pos += dma_blk_cnt * r_data->blksz;
291 } else {
292 dma_blk_cnt = TIFM_DMA_TSIZE;
293 dma_off = host->block_pos;
294 host->block_pos += t_size;
295 }
296
297 if (dma_blk_cnt)
298 sg = &r_data->sg[host->sg_pos];
299 else if (dma_len) {
300 if (r_data->flags & MMC_DATA_WRITE)
301 tifm_sd_bounce_block(host, r_data);
302 else
303 host->cmd_flags |= DATA_CARRY;
304
305 sg = &host->bounce_buf;
306 dma_off = 0;
307 dma_blk_cnt = 1;
308 } else
309 return 1;
310
311 dev_dbg(&sock->dev, "setting dma for %d blocks\n", dma_blk_cnt);
312 writel(sg_dma_address(sg) + dma_off, sock->addr + SOCK_DMA_ADDRESS);
313 if (r_data->flags & MMC_DATA_WRITE)
314 writel((dma_blk_cnt << 8) | TIFM_DMA_TX | TIFM_DMA_EN,
315 sock->addr + SOCK_DMA_CONTROL);
316 else
317 writel((dma_blk_cnt << 8) | TIFM_DMA_EN,
318 sock->addr + SOCK_DMA_CONTROL);
319
320 return 0;
321}
322
323static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
324{
325 unsigned int rc = 0;
326
327 switch (mmc_resp_type(cmd)) {
328 case MMC_RSP_NONE:
329 rc |= TIFM_MMCSD_RSP_R0;
330 break;
331 case MMC_RSP_R1B:
332 rc |= TIFM_MMCSD_RSP_BUSY;
333 fallthrough;
334 case MMC_RSP_R1:
335 rc |= TIFM_MMCSD_RSP_R1;
336 break;
337 case MMC_RSP_R2:
338 rc |= TIFM_MMCSD_RSP_R2;
339 break;
340 case MMC_RSP_R3:
341 rc |= TIFM_MMCSD_RSP_R3;
342 break;
343 default:
344 BUG();
345 }
346
347 switch (mmc_cmd_type(cmd)) {
348 case MMC_CMD_BC:
349 rc |= TIFM_MMCSD_CMD_BC;
350 break;
351 case MMC_CMD_BCR:
352 rc |= TIFM_MMCSD_CMD_BCR;
353 break;
354 case MMC_CMD_AC:
355 rc |= TIFM_MMCSD_CMD_AC;
356 break;
357 case MMC_CMD_ADTC:
358 rc |= TIFM_MMCSD_CMD_ADTC;
359 break;
360 default:
361 BUG();
362 }
363 return rc;
364}
365
366static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
367{
368 struct tifm_dev *sock = host->dev;
369 unsigned int cmd_mask = tifm_sd_op_flags(cmd);
370
371 if (host->open_drain)
372 cmd_mask |= TIFM_MMCSD_ODTO;
373
374 if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
375 cmd_mask |= TIFM_MMCSD_READ;
376
377 dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
378 cmd->opcode, cmd->arg, cmd_mask);
379
380 writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
381 writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
382 writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
383}
384
385static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
386{
387 cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
388 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
389 cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
390 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
391 cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
392 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
393 cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
394 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
395}
396
397static void tifm_sd_check_status(struct tifm_sd *host)
398{
399 struct tifm_dev *sock = host->dev;
400 struct mmc_command *cmd = host->req->cmd;
401
402 if (cmd->error)
403 goto finish_request;
404
405 if (!(host->cmd_flags & CMD_READY))
406 return;
407
408 if (cmd->data) {
409 if (cmd->data->error) {
410 if ((host->cmd_flags & SCMD_ACTIVE)
411 && !(host->cmd_flags & SCMD_READY))
412 return;
413
414 goto finish_request;
415 }
416
417 if (!(host->cmd_flags & BRS_READY))
418 return;
419
420 if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
421 return;
422
423 if (cmd->data->flags & MMC_DATA_WRITE) {
424 if (host->req->stop) {
425 if (!(host->cmd_flags & SCMD_ACTIVE)) {
426 host->cmd_flags |= SCMD_ACTIVE;
427 writel(TIFM_MMCSD_EOFB
428 | readl(sock->addr
429 + SOCK_MMCSD_INT_ENABLE),
430 sock->addr
431 + SOCK_MMCSD_INT_ENABLE);
432 tifm_sd_exec(host, host->req->stop);
433 return;
434 } else {
435 if (!(host->cmd_flags & SCMD_READY)
436 || (host->cmd_flags & CARD_BUSY))
437 return;
438 writel((~TIFM_MMCSD_EOFB)
439 & readl(sock->addr
440 + SOCK_MMCSD_INT_ENABLE),
441 sock->addr
442 + SOCK_MMCSD_INT_ENABLE);
443 }
444 } else {
445 if (host->cmd_flags & CARD_BUSY)
446 return;
447 writel((~TIFM_MMCSD_EOFB)
448 & readl(sock->addr
449 + SOCK_MMCSD_INT_ENABLE),
450 sock->addr + SOCK_MMCSD_INT_ENABLE);
451 }
452 } else {
453 if (host->req->stop) {
454 if (!(host->cmd_flags & SCMD_ACTIVE)) {
455 host->cmd_flags |= SCMD_ACTIVE;
456 tifm_sd_exec(host, host->req->stop);
457 return;
458 } else {
459 if (!(host->cmd_flags & SCMD_READY))
460 return;
461 }
462 }
463 }
464 }
465finish_request:
466 tasklet_schedule(&host->finish_tasklet);
467}
468
469/* Called from interrupt handler */
470static void tifm_sd_data_event(struct tifm_dev *sock)
471{
472 struct tifm_sd *host;
473 unsigned int fifo_status = 0;
474 struct mmc_data *r_data = NULL;
475
476 spin_lock(&sock->lock);
477 host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
478 fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
479 dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
480 fifo_status, host->cmd_flags);
481
482 if (host->req) {
483 r_data = host->req->cmd->data;
484
485 if (r_data && (fifo_status & TIFM_FIFO_READY)) {
486 if (tifm_sd_set_dma_data(host, r_data)) {
487 host->cmd_flags |= FIFO_READY;
488 tifm_sd_check_status(host);
489 }
490 }
491 }
492
493 writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
494 spin_unlock(&sock->lock);
495}
496
497/* Called from interrupt handler */
498static void tifm_sd_card_event(struct tifm_dev *sock)
499{
500 struct tifm_sd *host;
501 unsigned int host_status = 0;
502 int cmd_error = 0;
503 struct mmc_command *cmd = NULL;
504
505 spin_lock(&sock->lock);
506 host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
507 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
508 dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
509 host_status, host->cmd_flags);
510
511 if (host->req) {
512 cmd = host->req->cmd;
513
514 if (host_status & TIFM_MMCSD_ERRMASK) {
515 writel(host_status & TIFM_MMCSD_ERRMASK,
516 sock->addr + SOCK_MMCSD_STATUS);
517 if (host_status & TIFM_MMCSD_CTO)
518 cmd_error = -ETIMEDOUT;
519 else if (host_status & TIFM_MMCSD_CCRC)
520 cmd_error = -EILSEQ;
521
522 if (cmd->data) {
523 if (host_status & TIFM_MMCSD_DTO)
524 cmd->data->error = -ETIMEDOUT;
525 else if (host_status & TIFM_MMCSD_DCRC)
526 cmd->data->error = -EILSEQ;
527 }
528
529 writel(TIFM_FIFO_INT_SETALL,
530 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
531 writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
532
533 if (host->req->stop) {
534 if (host->cmd_flags & SCMD_ACTIVE) {
535 host->req->stop->error = cmd_error;
536 host->cmd_flags |= SCMD_READY;
537 } else {
538 cmd->error = cmd_error;
539 host->cmd_flags |= SCMD_ACTIVE;
540 tifm_sd_exec(host, host->req->stop);
541 goto done;
542 }
543 } else
544 cmd->error = cmd_error;
545 } else {
546 if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
547 if (!(host->cmd_flags & CMD_READY)) {
548 host->cmd_flags |= CMD_READY;
549 tifm_sd_fetch_resp(cmd, sock);
550 } else if (host->cmd_flags & SCMD_ACTIVE) {
551 host->cmd_flags |= SCMD_READY;
552 tifm_sd_fetch_resp(host->req->stop,
553 sock);
554 }
555 }
556 if (host_status & TIFM_MMCSD_BRS)
557 host->cmd_flags |= BRS_READY;
558 }
559
560 if (host->no_dma && cmd->data) {
561 if (host_status & TIFM_MMCSD_AE)
562 writel(host_status & TIFM_MMCSD_AE,
563 sock->addr + SOCK_MMCSD_STATUS);
564
565 if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
566 | TIFM_MMCSD_BRS)) {
567 tifm_sd_transfer_data(host);
568 host_status &= ~TIFM_MMCSD_AE;
569 }
570 }
571
572 if (host_status & TIFM_MMCSD_EOFB)
573 host->cmd_flags &= ~CARD_BUSY;
574 else if (host_status & TIFM_MMCSD_CB)
575 host->cmd_flags |= CARD_BUSY;
576
577 tifm_sd_check_status(host);
578 }
579done:
580 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
581 spin_unlock(&sock->lock);
582}
583
584static void tifm_sd_set_data_timeout(struct tifm_sd *host,
585 struct mmc_data *data)
586{
587 struct tifm_dev *sock = host->dev;
588 unsigned int data_timeout = data->timeout_clks;
589
590 if (fixed_timeout)
591 return;
592
593 data_timeout += data->timeout_ns /
594 ((1000000000UL / host->clk_freq) * host->clk_div);
595
596 if (data_timeout < 0xffff) {
597 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
598 writel((~TIFM_MMCSD_DPE)
599 & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
600 sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
601 } else {
602 data_timeout = (data_timeout >> 10) + 1;
603 if (data_timeout > 0xffff)
604 data_timeout = 0; /* set to unlimited */
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 }
610}
611
612static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
613{
614 struct tifm_sd *host = mmc_priv(mmc);
615 struct tifm_dev *sock = host->dev;
616 unsigned long flags;
617 struct mmc_data *r_data = mrq->cmd->data;
618
619 spin_lock_irqsave(&sock->lock, flags);
620 if (host->eject) {
621 mrq->cmd->error = -ENOMEDIUM;
622 goto err_out;
623 }
624
625 if (host->req) {
626 pr_err("%s : unfinished request detected\n",
627 dev_name(&sock->dev));
628 mrq->cmd->error = -ETIMEDOUT;
629 goto err_out;
630 }
631
632 host->cmd_flags = 0;
633 host->block_pos = 0;
634 host->sg_pos = 0;
635
636 if (mrq->data && !is_power_of_2(mrq->data->blksz))
637 host->no_dma = 1;
638 else
639 host->no_dma = no_dma ? 1 : 0;
640
641 if (r_data) {
642 tifm_sd_set_data_timeout(host, r_data);
643
644 if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop)
645 writel(TIFM_MMCSD_EOFB
646 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
647 sock->addr + SOCK_MMCSD_INT_ENABLE);
648
649 if (host->no_dma) {
650 writel(TIFM_MMCSD_BUFINT
651 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
652 sock->addr + SOCK_MMCSD_INT_ENABLE);
653 writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
654 | (TIFM_MMCSD_FIFO_SIZE - 1),
655 sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
656
657 host->sg_len = r_data->sg_len;
658 } else {
659 sg_init_one(&host->bounce_buf, host->bounce_buf_data,
660 r_data->blksz);
661
662 if(1 != tifm_map_sg(sock, &host->bounce_buf, 1,
663 r_data->flags & MMC_DATA_WRITE
664 ? DMA_TO_DEVICE
665 : DMA_FROM_DEVICE)) {
666 pr_err("%s : scatterlist map failed\n",
667 dev_name(&sock->dev));
668 mrq->cmd->error = -ENOMEM;
669 goto err_out;
670 }
671 host->sg_len = tifm_map_sg(sock, r_data->sg,
672 r_data->sg_len,
673 r_data->flags
674 & MMC_DATA_WRITE
675 ? DMA_TO_DEVICE
676 : DMA_FROM_DEVICE);
677 if (host->sg_len < 1) {
678 pr_err("%s : scatterlist map failed\n",
679 dev_name(&sock->dev));
680 tifm_unmap_sg(sock, &host->bounce_buf, 1,
681 r_data->flags & MMC_DATA_WRITE
682 ? DMA_TO_DEVICE
683 : DMA_FROM_DEVICE);
684 mrq->cmd->error = -ENOMEM;
685 goto err_out;
686 }
687
688 writel(TIFM_FIFO_INT_SETALL,
689 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
690 writel(ilog2(r_data->blksz) - 2,
691 sock->addr + SOCK_FIFO_PAGE_SIZE);
692 writel(TIFM_FIFO_ENABLE,
693 sock->addr + SOCK_FIFO_CONTROL);
694 writel(TIFM_FIFO_INTMASK,
695 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
696
697 if (r_data->flags & MMC_DATA_WRITE)
698 writel(TIFM_MMCSD_TXDE,
699 sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
700 else
701 writel(TIFM_MMCSD_RXDE,
702 sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
703
704 tifm_sd_set_dma_data(host, r_data);
705 }
706
707 writel(r_data->blocks - 1,
708 sock->addr + SOCK_MMCSD_NUM_BLOCKS);
709 writel(r_data->blksz - 1,
710 sock->addr + SOCK_MMCSD_BLOCK_LEN);
711 }
712
713 host->req = mrq;
714 mod_timer(&host->timer, jiffies + host->timeout_jiffies);
715 writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
716 sock->addr + SOCK_CONTROL);
717 tifm_sd_exec(host, mrq->cmd);
718 spin_unlock_irqrestore(&sock->lock, flags);
719 return;
720
721err_out:
722 spin_unlock_irqrestore(&sock->lock, flags);
723 mmc_request_done(mmc, mrq);
724}
725
726static void tifm_sd_end_cmd(struct tasklet_struct *t)
727{
728 struct tifm_sd *host = from_tasklet(host, t, finish_tasklet);
729 struct tifm_dev *sock = host->dev;
730 struct mmc_host *mmc = tifm_get_drvdata(sock);
731 struct mmc_request *mrq;
732 struct mmc_data *r_data = NULL;
733 unsigned long flags;
734
735 spin_lock_irqsave(&sock->lock, flags);
736
737 del_timer(&host->timer);
738 mrq = host->req;
739 host->req = NULL;
740
741 if (!mrq) {
742 pr_err(" %s : no request to complete?\n",
743 dev_name(&sock->dev));
744 spin_unlock_irqrestore(&sock->lock, flags);
745 return;
746 }
747
748 r_data = mrq->cmd->data;
749 if (r_data) {
750 if (host->no_dma) {
751 writel((~TIFM_MMCSD_BUFINT)
752 & readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
753 sock->addr + SOCK_MMCSD_INT_ENABLE);
754 } else {
755 tifm_unmap_sg(sock, &host->bounce_buf, 1,
756 (r_data->flags & MMC_DATA_WRITE)
757 ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
758 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
759 (r_data->flags & MMC_DATA_WRITE)
760 ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
761 }
762
763 r_data->bytes_xfered = r_data->blocks
764 - readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
765 r_data->bytes_xfered *= r_data->blksz;
766 r_data->bytes_xfered += r_data->blksz
767 - readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
768 }
769
770 writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
771 sock->addr + SOCK_CONTROL);
772
773 spin_unlock_irqrestore(&sock->lock, flags);
774 mmc_request_done(mmc, mrq);
775}
776
777static void tifm_sd_abort(struct timer_list *t)
778{
779 struct tifm_sd *host = from_timer(host, t, timer);
780
781 pr_err("%s : card failed to respond for a long period of time "
782 "(%x, %x)\n",
783 dev_name(&host->dev->dev), host->req->cmd->opcode, host->cmd_flags);
784
785 tifm_eject(host->dev);
786}
787
788static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
789{
790 struct tifm_sd *host = mmc_priv(mmc);
791 struct tifm_dev *sock = host->dev;
792 unsigned int clk_div1, clk_div2;
793 unsigned long flags;
794
795 spin_lock_irqsave(&sock->lock, flags);
796
797 dev_dbg(&sock->dev, "ios: clock = %u, vdd = %x, bus_mode = %x, "
798 "chip_select = %x, power_mode = %x, bus_width = %x\n",
799 ios->clock, ios->vdd, ios->bus_mode, ios->chip_select,
800 ios->power_mode, ios->bus_width);
801
802 if (ios->bus_width == MMC_BUS_WIDTH_4) {
803 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
804 sock->addr + SOCK_MMCSD_CONFIG);
805 } else {
806 writel((~TIFM_MMCSD_4BBUS)
807 & readl(sock->addr + SOCK_MMCSD_CONFIG),
808 sock->addr + SOCK_MMCSD_CONFIG);
809 }
810
811 if (ios->clock) {
812 clk_div1 = 20000000 / ios->clock;
813 if (!clk_div1)
814 clk_div1 = 1;
815
816 clk_div2 = 24000000 / ios->clock;
817 if (!clk_div2)
818 clk_div2 = 1;
819
820 if ((20000000 / clk_div1) > ios->clock)
821 clk_div1++;
822 if ((24000000 / clk_div2) > ios->clock)
823 clk_div2++;
824 if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
825 host->clk_freq = 20000000;
826 host->clk_div = clk_div1;
827 writel((~TIFM_CTRL_FAST_CLK)
828 & readl(sock->addr + SOCK_CONTROL),
829 sock->addr + SOCK_CONTROL);
830 } else {
831 host->clk_freq = 24000000;
832 host->clk_div = clk_div2;
833 writel(TIFM_CTRL_FAST_CLK
834 | readl(sock->addr + SOCK_CONTROL),
835 sock->addr + SOCK_CONTROL);
836 }
837 } else {
838 host->clk_div = 0;
839 }
840 host->clk_div &= TIFM_MMCSD_CLKMASK;
841 writel(host->clk_div
842 | ((~TIFM_MMCSD_CLKMASK)
843 & readl(sock->addr + SOCK_MMCSD_CONFIG)),
844 sock->addr + SOCK_MMCSD_CONFIG);
845
846 host->open_drain = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN);
847
848 /* chip_select : maybe later */
849 //vdd
850 //power is set before probe / after remove
851
852 spin_unlock_irqrestore(&sock->lock, flags);
853}
854
855static int tifm_sd_ro(struct mmc_host *mmc)
856{
857 int rc = 0;
858 struct tifm_sd *host = mmc_priv(mmc);
859 struct tifm_dev *sock = host->dev;
860 unsigned long flags;
861
862 spin_lock_irqsave(&sock->lock, flags);
863 if (TIFM_MMCSD_CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE))
864 rc = 1;
865 spin_unlock_irqrestore(&sock->lock, flags);
866 return rc;
867}
868
869static const struct mmc_host_ops tifm_sd_ops = {
870 .request = tifm_sd_request,
871 .set_ios = tifm_sd_ios,
872 .get_ro = tifm_sd_ro
873};
874
875static int tifm_sd_initialize_host(struct tifm_sd *host)
876{
877 int rc;
878 unsigned int host_status = 0;
879 struct tifm_dev *sock = host->dev;
880
881 writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
882 host->clk_div = 61;
883 host->clk_freq = 20000000;
884 writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
885 writel(host->clk_div | TIFM_MMCSD_POWER,
886 sock->addr + SOCK_MMCSD_CONFIG);
887
888 /* wait up to 0.51 sec for reset */
889 for (rc = 32; rc <= 256; rc <<= 1) {
890 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
891 rc = 0;
892 break;
893 }
894 msleep(rc);
895 }
896
897 if (rc) {
898 pr_err("%s : controller failed to reset\n",
899 dev_name(&sock->dev));
900 return -ENODEV;
901 }
902
903 writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
904 writel(host->clk_div | TIFM_MMCSD_POWER,
905 sock->addr + SOCK_MMCSD_CONFIG);
906 writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
907
908 // command timeout fixed to 64 clocks for now
909 writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO);
910 writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
911
912 for (rc = 16; rc <= 64; rc <<= 1) {
913 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
914 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
915 if (!(host_status & TIFM_MMCSD_ERRMASK)
916 && (host_status & TIFM_MMCSD_EOC)) {
917 rc = 0;
918 break;
919 }
920 msleep(rc);
921 }
922
923 if (rc) {
924 pr_err("%s : card not ready - probe failed on initialization\n",
925 dev_name(&sock->dev));
926 return -ENODEV;
927 }
928
929 writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC
930 | TIFM_MMCSD_ERRMASK,
931 sock->addr + SOCK_MMCSD_INT_ENABLE);
932
933 return 0;
934}
935
936static int tifm_sd_probe(struct tifm_dev *sock)
937{
938 struct mmc_host *mmc;
939 struct tifm_sd *host;
940 int rc = -EIO;
941
942 if (!(TIFM_SOCK_STATE_OCCUPIED
943 & readl(sock->addr + SOCK_PRESENT_STATE))) {
944 pr_warn("%s : card gone, unexpectedly\n",
945 dev_name(&sock->dev));
946 return rc;
947 }
948
949 mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
950 if (!mmc)
951 return -ENOMEM;
952
953 host = mmc_priv(mmc);
954 tifm_set_drvdata(sock, mmc);
955 host->dev = sock;
956 host->timeout_jiffies = msecs_to_jiffies(TIFM_MMCSD_REQ_TIMEOUT_MS);
957 /*
958 * We use a fixed request timeout of 1s, hence inform the core about it.
959 * A future improvement should instead respect the cmd->busy_timeout.
960 */
961 mmc->max_busy_timeout = TIFM_MMCSD_REQ_TIMEOUT_MS;
962
963 tasklet_setup(&host->finish_tasklet, tifm_sd_end_cmd);
964 timer_setup(&host->timer, tifm_sd_abort, 0);
965
966 mmc->ops = &tifm_sd_ops;
967 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
968 mmc->caps = MMC_CAP_4_BIT_DATA;
969 mmc->f_min = 20000000 / 60;
970 mmc->f_max = 24000000;
971
972 mmc->max_blk_count = 2048;
973 mmc->max_segs = mmc->max_blk_count;
974 mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE);
975 mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size;
976 mmc->max_req_size = mmc->max_seg_size;
977
978 sock->card_event = tifm_sd_card_event;
979 sock->data_event = tifm_sd_data_event;
980 rc = tifm_sd_initialize_host(host);
981
982 if (!rc)
983 rc = mmc_add_host(mmc);
984 if (!rc)
985 return 0;
986
987 mmc_free_host(mmc);
988 return rc;
989}
990
991static void tifm_sd_remove(struct tifm_dev *sock)
992{
993 struct mmc_host *mmc = tifm_get_drvdata(sock);
994 struct tifm_sd *host = mmc_priv(mmc);
995 unsigned long flags;
996
997 spin_lock_irqsave(&sock->lock, flags);
998 host->eject = 1;
999 writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
1000 spin_unlock_irqrestore(&sock->lock, flags);
1001
1002 tasklet_kill(&host->finish_tasklet);
1003
1004 spin_lock_irqsave(&sock->lock, flags);
1005 if (host->req) {
1006 writel(TIFM_FIFO_INT_SETALL,
1007 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
1008 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
1009 host->req->cmd->error = -ENOMEDIUM;
1010 if (host->req->stop)
1011 host->req->stop->error = -ENOMEDIUM;
1012 tasklet_schedule(&host->finish_tasklet);
1013 }
1014 spin_unlock_irqrestore(&sock->lock, flags);
1015 mmc_remove_host(mmc);
1016 dev_dbg(&sock->dev, "after remove\n");
1017
1018 mmc_free_host(mmc);
1019}
1020
1021#ifdef CONFIG_PM
1022
1023static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
1024{
1025 return 0;
1026}
1027
1028static int tifm_sd_resume(struct tifm_dev *sock)
1029{
1030 struct mmc_host *mmc = tifm_get_drvdata(sock);
1031 struct tifm_sd *host = mmc_priv(mmc);
1032 int rc;
1033
1034 rc = tifm_sd_initialize_host(host);
1035 dev_dbg(&sock->dev, "resume initialize %d\n", rc);
1036
1037 if (rc)
1038 host->eject = 1;
1039
1040 return rc;
1041}
1042
1043#else
1044
1045#define tifm_sd_suspend NULL
1046#define tifm_sd_resume NULL
1047
1048#endif /* CONFIG_PM */
1049
1050static struct tifm_device_id tifm_sd_id_tbl[] = {
1051 { TIFM_TYPE_SD }, { }
1052};
1053
1054static struct tifm_driver tifm_sd_driver = {
1055 .driver = {
1056 .name = DRIVER_NAME,
1057 .owner = THIS_MODULE
1058 },
1059 .id_table = tifm_sd_id_tbl,
1060 .probe = tifm_sd_probe,
1061 .remove = tifm_sd_remove,
1062 .suspend = tifm_sd_suspend,
1063 .resume = tifm_sd_resume
1064};
1065
1066static int __init tifm_sd_init(void)
1067{
1068 return tifm_register_driver(&tifm_sd_driver);
1069}
1070
1071static void __exit tifm_sd_exit(void)
1072{
1073 tifm_unregister_driver(&tifm_sd_driver);
1074}
1075
1076MODULE_AUTHOR("Alex Dubov");
1077MODULE_DESCRIPTION("TI FlashMedia SD driver");
1078MODULE_LICENSE("GPL");
1079MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
1080MODULE_VERSION(DRIVER_VERSION);
1081
1082module_init(tifm_sd_init);
1083module_exit(tifm_sd_exit);