0fdc55b08a6daa72cb60ccdd8fc981e0cc648f7b
[linux-3.10.git] / drivers / mmc / 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  */
11
12
13 #include <linux/tifm.h>
14 #include <linux/mmc/protocol.h>
15 #include <linux/mmc/host.h>
16 #include <linux/highmem.h>
17 #include <asm/io.h>
18
19 #define DRIVER_NAME "tifm_sd"
20 #define DRIVER_VERSION "0.6"
21
22 static int no_dma = 0;
23 static int fixed_timeout = 0;
24 module_param(no_dma, bool, 0644);
25 module_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_DATAMASK   0x001d   /* set bits: EOFB, BRS, CB, EOC */
40 #define TIFM_MMCSD_ERRMASK    0x41e0   /* set bits: CERR, CCRC, CTO, DCRC, DTO */
41 #define TIFM_MMCSD_EOC        0x0001   /* end of command phase  */
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_CERR       0x4000   /* card status error     */
52
53 #define TIFM_MMCSD_FIFO_SIZE  0x0020
54
55 #define TIFM_MMCSD_RSP_R0     0x0000
56 #define TIFM_MMCSD_RSP_R1     0x0100
57 #define TIFM_MMCSD_RSP_R2     0x0200
58 #define TIFM_MMCSD_RSP_R3     0x0300
59 #define TIFM_MMCSD_RSP_R4     0x0400
60 #define TIFM_MMCSD_RSP_R5     0x0500
61 #define TIFM_MMCSD_RSP_R6     0x0600
62
63 #define TIFM_MMCSD_RSP_BUSY   0x0800
64
65 #define TIFM_MMCSD_CMD_BC     0x0000
66 #define TIFM_MMCSD_CMD_BCR    0x1000
67 #define TIFM_MMCSD_CMD_AC     0x2000
68 #define TIFM_MMCSD_CMD_ADTC   0x3000
69
70 typedef enum {
71         IDLE = 0,
72         CMD,    /* main command ended                   */
73         BRS,    /* block transfer finished              */
74         SCMD,   /* stop command ended                   */
75         CARD,   /* card left busy state                 */
76         FIFO,   /* FIFO operation completed (uncertain) */
77         READY
78 } card_state_t;
79
80 enum {
81         FIFO_RDY   = 0x0001,     /* hardware dependent value */
82         HOST_REG   = 0x0002,
83         EJECT      = 0x0004,
84         EJECT_DONE = 0x0008,
85         CARD_BUSY  = 0x0010,
86         OPENDRAIN  = 0x0040,     /* hardware dependent value */
87         CARD_EVENT = 0x0100,     /* hardware dependent value */
88         CARD_RO    = 0x0200,     /* hardware dependent value */
89         FIFO_EVENT = 0x10000 };  /* hardware dependent value */
90
91 struct tifm_sd {
92         struct tifm_dev     *dev;
93
94         unsigned int        flags;
95         card_state_t        state;
96         unsigned int        clk_freq;
97         unsigned int        clk_div;
98         unsigned long       timeout_jiffies; // software timeout - 2 sec
99
100         struct mmc_request    *req;
101         struct work_struct    cmd_handler;
102         struct work_struct    abort_handler;
103         wait_queue_head_t     can_eject;
104
105         size_t                written_blocks;
106         char                  *buffer;
107         size_t                buffer_size;
108         size_t                buffer_pos;
109
110 };
111
112 static int tifm_sd_transfer_data(struct tifm_dev *sock, struct tifm_sd *host,
113                                         unsigned int host_status)
114 {
115         struct mmc_command *cmd = host->req->cmd;
116         unsigned int t_val = 0, cnt = 0;
117
118         if (host_status & TIFM_MMCSD_BRS) {
119                 /* in non-dma rx mode BRS fires when fifo is still not empty */
120                 if (host->buffer && (cmd->data->flags & MMC_DATA_READ)) {
121                         while (host->buffer_size > host->buffer_pos) {
122                                 t_val = readl(sock->addr + SOCK_MMCSD_DATA);
123                                 host->buffer[host->buffer_pos++] = t_val & 0xff;
124                                 host->buffer[host->buffer_pos++] =
125                                                         (t_val >> 8) & 0xff;
126                         }
127                 }
128                 return 1;
129         } else if (host->buffer) {
130                 if ((cmd->data->flags & MMC_DATA_READ) &&
131                                 (host_status & TIFM_MMCSD_AF)) {
132                         for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
133                                 t_val = readl(sock->addr + SOCK_MMCSD_DATA);
134                                 if (host->buffer_size > host->buffer_pos) {
135                                         host->buffer[host->buffer_pos++] =
136                                                         t_val & 0xff;
137                                         host->buffer[host->buffer_pos++] =
138                                                         (t_val >> 8) & 0xff;
139                                 }
140                         }
141                 } else if ((cmd->data->flags & MMC_DATA_WRITE)
142                            && (host_status & TIFM_MMCSD_AE)) {
143                         for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
144                                 if (host->buffer_size > host->buffer_pos) {
145                                         t_val = host->buffer[host->buffer_pos++] & 0x00ff;
146                                         t_val |= ((host->buffer[host->buffer_pos++]) << 8)
147                                                  & 0xff00;
148                                         writel(t_val,
149                                                 sock->addr + SOCK_MMCSD_DATA);
150                                 }
151                         }
152                 }
153         }
154         return 0;
155 }
156
157 static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
158 {
159         unsigned int rc = 0;
160
161         switch (mmc_resp_type(cmd)) {
162         case MMC_RSP_NONE:
163                 rc |= TIFM_MMCSD_RSP_R0;
164                 break;
165         case MMC_RSP_R1B:
166                 rc |= TIFM_MMCSD_RSP_BUSY; // deliberate fall-through
167         case MMC_RSP_R1:
168                 rc |= TIFM_MMCSD_RSP_R1;
169                 break;
170         case MMC_RSP_R2:
171                 rc |= TIFM_MMCSD_RSP_R2;
172                 break;
173         case MMC_RSP_R3:
174                 rc |= TIFM_MMCSD_RSP_R3;
175                 break;
176         case MMC_RSP_R6:
177                 rc |= TIFM_MMCSD_RSP_R6;
178                 break;
179         default:
180                 BUG();
181         }
182
183         switch (mmc_cmd_type(cmd)) {
184         case MMC_CMD_BC:
185                 rc |= TIFM_MMCSD_CMD_BC;
186                 break;
187         case MMC_CMD_BCR:
188                 rc |= TIFM_MMCSD_CMD_BCR;
189                 break;
190         case MMC_CMD_AC:
191                 rc |= TIFM_MMCSD_CMD_AC;
192                 break;
193         case MMC_CMD_ADTC:
194                 rc |= TIFM_MMCSD_CMD_ADTC;
195                 break;
196         default:
197                 BUG();
198         }
199         return rc;
200 }
201
202 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
203 {
204         struct tifm_dev *sock = host->dev;
205         unsigned int cmd_mask = tifm_sd_op_flags(cmd) |
206                                 (host->flags & OPENDRAIN);
207
208         if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
209                 cmd_mask |= TIFM_MMCSD_READ;
210
211         dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
212                                 cmd->opcode, cmd->arg, cmd_mask);
213
214         writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
215         writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
216         writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
217 }
218
219 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
220 {
221         cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
222                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
223         cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
224                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
225         cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
226                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
227         cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
228                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
229 }
230
231 static void tifm_sd_process_cmd(struct tifm_dev *sock, struct tifm_sd *host,
232                                        unsigned int host_status)
233 {
234         struct mmc_command *cmd = host->req->cmd;
235
236 change_state:
237         switch (host->state) {
238         case IDLE:
239                 return;
240         case CMD:
241                 if (host_status & TIFM_MMCSD_EOC) {
242                         tifm_sd_fetch_resp(cmd, sock);
243                         if (cmd->data) {
244                                 host->state = BRS;
245                         } else
246                                 host->state = READY;
247                         goto change_state;
248                 }
249                 break;
250         case BRS:
251                 if (tifm_sd_transfer_data(sock, host, host_status)) {
252                         if (!host->req->stop) {
253                                 if (cmd->data->flags & MMC_DATA_WRITE) {
254                                         host->state = CARD;
255                                 } else {
256                                         host->state =
257                                                 host->buffer ? READY : FIFO;
258                                 }
259                                 goto change_state;
260                         }
261                         tifm_sd_exec(host, host->req->stop);
262                         host->state = SCMD;
263                 }
264                 break;
265         case SCMD:
266                 if (host_status & TIFM_MMCSD_EOC) {
267                         tifm_sd_fetch_resp(host->req->stop, sock);
268                         if (cmd->error) {
269                                 host->state = READY;
270                         } else if (cmd->data->flags & MMC_DATA_WRITE) {
271                                 host->state = CARD;
272                         } else {
273                                 host->state = host->buffer ? READY : FIFO;
274                         }
275                         goto change_state;
276                 }
277                 break;
278         case CARD:
279                 if (!(host->flags & CARD_BUSY)
280                     && (host->written_blocks == cmd->data->blocks)) {
281                         host->state = host->buffer ? READY : FIFO;
282                         goto change_state;
283                 }
284                 break;
285         case FIFO:
286                 if (host->flags & FIFO_RDY) {
287                         host->state = READY;
288                         host->flags &= ~FIFO_RDY;
289                         goto change_state;
290                 }
291                 break;
292         case READY:
293                 queue_work(sock->wq, &host->cmd_handler);
294                 return;
295         }
296
297         queue_delayed_work(sock->wq, &host->abort_handler,
298                                 host->timeout_jiffies);
299 }
300
301 /* Called from interrupt handler */
302 static unsigned int tifm_sd_signal_irq(struct tifm_dev *sock,
303                                         unsigned int sock_irq_status)
304 {
305         struct tifm_sd *host;
306         unsigned int host_status = 0, fifo_status = 0;
307         int error_code = 0;
308
309         spin_lock(&sock->lock);
310         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
311         cancel_delayed_work(&host->abort_handler);
312
313         if (sock_irq_status & FIFO_EVENT) {
314                 fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
315                 writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
316
317                 host->flags |= fifo_status & FIFO_RDY;
318         }
319
320         if (sock_irq_status & CARD_EVENT) {
321                 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
322                 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
323
324                 if (!(host->flags & HOST_REG))
325                         queue_work(sock->wq, &host->cmd_handler);
326                 if (!host->req)
327                         goto done;
328
329                 if (host_status & TIFM_MMCSD_ERRMASK) {
330                         if (host_status & TIFM_MMCSD_CERR)
331                                 error_code = MMC_ERR_FAILED;
332                         else if (host_status &
333                                         (TIFM_MMCSD_CTO | TIFM_MMCSD_DTO))
334                                 error_code = MMC_ERR_TIMEOUT;
335                         else if (host_status &
336                                         (TIFM_MMCSD_CCRC | TIFM_MMCSD_DCRC))
337                                 error_code = MMC_ERR_BADCRC;
338
339                         writel(TIFM_FIFO_INT_SETALL,
340                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
341                         writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
342
343                         if (host->req->stop) {
344                                 if (host->state == SCMD) {
345                                         host->req->stop->error = error_code;
346                                 } else if(host->state == BRS) {
347                                         host->req->cmd->error = error_code;
348                                         tifm_sd_exec(host, host->req->stop);
349                                         queue_delayed_work(sock->wq,
350                                                 &host->abort_handler,
351                                                 host->timeout_jiffies);
352                                         host->state = SCMD;
353                                         goto done;
354                                 } else {
355                                         host->req->cmd->error = error_code;
356                                 }
357                         } else {
358                                 host->req->cmd->error = error_code;
359                         }
360                         host->state = READY;
361                 }
362
363                 if (host_status & TIFM_MMCSD_CB)
364                         host->flags |= CARD_BUSY;
365                 if ((host_status & TIFM_MMCSD_EOFB) &&
366                                 (host->flags & CARD_BUSY)) {
367                         host->written_blocks++;
368                         host->flags &= ~CARD_BUSY;
369                 }
370         }
371
372         if (host->req)
373                 tifm_sd_process_cmd(sock, host, host_status);
374 done:
375         dev_dbg(&sock->dev, "host_status %x, fifo_status %x\n",
376                         host_status, fifo_status);
377         spin_unlock(&sock->lock);
378         return sock_irq_status;
379 }
380
381 static void tifm_sd_prepare_data(struct tifm_sd *card, struct mmc_command *cmd)
382 {
383         struct tifm_dev *sock = card->dev;
384         unsigned int dest_cnt;
385
386         /* DMA style IO */
387
388         writel(TIFM_FIFO_INT_SETALL,
389                 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
390         writel(long_log2(cmd->data->blksz) - 2,
391                         sock->addr + SOCK_FIFO_PAGE_SIZE);
392         writel(TIFM_FIFO_ENABLE, sock->addr + SOCK_FIFO_CONTROL);
393         writel(TIFM_FIFO_INTMASK, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
394
395         dest_cnt = (cmd->data->blocks) << 8;
396
397         writel(sg_dma_address(cmd->data->sg), sock->addr + SOCK_DMA_ADDRESS);
398
399         writel(cmd->data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
400         writel(cmd->data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
401
402         if (cmd->data->flags & MMC_DATA_WRITE) {
403                 writel(TIFM_MMCSD_TXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
404                 writel(dest_cnt | TIFM_DMA_TX | TIFM_DMA_EN,
405                         sock->addr + SOCK_DMA_CONTROL);
406         } else {
407                 writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
408                 writel(dest_cnt | TIFM_DMA_EN, sock->addr + SOCK_DMA_CONTROL);
409         }
410 }
411
412 static void tifm_sd_set_data_timeout(struct tifm_sd *host,
413                                         struct mmc_data *data)
414 {
415         struct tifm_dev *sock = host->dev;
416         unsigned int data_timeout = data->timeout_clks;
417
418         if (fixed_timeout)
419                 return;
420
421         data_timeout += data->timeout_ns /
422                         ((1000000000 / host->clk_freq) * host->clk_div);
423         data_timeout *= 10; // call it fudge factor for now
424
425         if (data_timeout < 0xffff) {
426                 writel((~TIFM_MMCSD_DPE) &
427                                 readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
428                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
429                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
430         } else {
431                 writel(TIFM_MMCSD_DPE |
432                                 readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
433                         sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
434                 data_timeout = (data_timeout >> 10) + 1;
435                 if(data_timeout > 0xffff)
436                         data_timeout = 0;       /* set to unlimited */
437                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
438         }
439 }
440
441 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
442 {
443         struct tifm_sd *host = mmc_priv(mmc);
444         struct tifm_dev *sock = host->dev;
445         unsigned long flags;
446         int sg_count = 0;
447         struct mmc_data *r_data = mrq->cmd->data;
448
449         spin_lock_irqsave(&sock->lock, flags);
450         if (host->flags & EJECT) {
451                 spin_unlock_irqrestore(&sock->lock, flags);
452                 goto err_out;
453         }
454
455         if (host->req) {
456                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
457                 spin_unlock_irqrestore(&sock->lock, flags);
458                 goto err_out;
459         }
460
461         if (r_data) {
462                 tifm_sd_set_data_timeout(host, r_data);
463
464                 sg_count = tifm_map_sg(sock, r_data->sg, r_data->sg_len,
465                                        mrq->cmd->flags & MMC_DATA_WRITE
466                                        ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
467                 if (sg_count != 1) {
468                         printk(KERN_ERR DRIVER_NAME
469                                 ": scatterlist map failed\n");
470                         spin_unlock_irqrestore(&sock->lock, flags);
471                         goto err_out;
472                 }
473
474                 host->written_blocks = 0;
475                 host->flags &= ~CARD_BUSY;
476                 tifm_sd_prepare_data(host, mrq->cmd);
477         }
478
479         host->req = mrq;
480         host->state = CMD;
481         queue_delayed_work(sock->wq, &host->abort_handler,
482                                 host->timeout_jiffies);
483         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
484                 sock->addr + SOCK_CONTROL);
485         tifm_sd_exec(host, mrq->cmd);
486         spin_unlock_irqrestore(&sock->lock, flags);
487         return;
488
489 err_out:
490         if (sg_count > 0)
491                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
492                               (r_data->flags & MMC_DATA_WRITE)
493                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
494
495         mrq->cmd->error = MMC_ERR_TIMEOUT;
496         mmc_request_done(mmc, mrq);
497 }
498
499 static void tifm_sd_end_cmd(void *data)
500 {
501         struct tifm_sd *host = data;
502         struct tifm_dev *sock = host->dev;
503         struct mmc_host *mmc = tifm_get_drvdata(sock);
504         struct mmc_request *mrq;
505         struct mmc_data *r_data = NULL;
506         unsigned long flags;
507
508         spin_lock_irqsave(&sock->lock, flags);
509
510         mrq = host->req;
511         host->req = NULL;
512         host->state = IDLE;
513
514         if (!mrq) {
515                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
516                 spin_unlock_irqrestore(&sock->lock, flags);
517                 return;
518         }
519
520         r_data = mrq->cmd->data;
521         if (r_data) {
522                 if (r_data->flags & MMC_DATA_WRITE) {
523                         r_data->bytes_xfered = host->written_blocks *
524                                                 r_data->blksz;
525                 } else {
526                         r_data->bytes_xfered = r_data->blocks -
527                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
528                         r_data->bytes_xfered *= r_data->blksz;
529                         r_data->bytes_xfered += r_data->blksz -
530                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
531                 }
532                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
533                               (r_data->flags & MMC_DATA_WRITE)
534                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
535         }
536
537         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
538                         sock->addr + SOCK_CONTROL);
539
540         spin_unlock_irqrestore(&sock->lock, flags);
541         mmc_request_done(mmc, mrq);
542 }
543
544 static void tifm_sd_request_nodma(struct mmc_host *mmc, struct mmc_request *mrq)
545 {
546         struct tifm_sd *host = mmc_priv(mmc);
547         struct tifm_dev *sock = host->dev;
548         unsigned long flags;
549         struct mmc_data *r_data = mrq->cmd->data;
550         char *t_buffer = NULL;
551
552         if (r_data) {
553                 t_buffer = kmap(r_data->sg->page);
554                 if (!t_buffer) {
555                         printk(KERN_ERR DRIVER_NAME ": kmap failed\n");
556                         goto err_out;
557                 }
558         }
559
560         spin_lock_irqsave(&sock->lock, flags);
561         if (host->flags & EJECT) {
562                 spin_unlock_irqrestore(&sock->lock, flags);
563                 goto err_out;
564         }
565
566         if (host->req) {
567                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
568                 spin_unlock_irqrestore(&sock->lock, flags);
569                 goto err_out;
570         }
571
572         if (r_data) {
573                 tifm_sd_set_data_timeout(host, r_data);
574
575                 host->buffer = t_buffer + r_data->sg->offset;
576                 host->buffer_size = mrq->cmd->data->blocks *
577                                         mrq->cmd->data->blksz;
578
579                 writel(TIFM_MMCSD_BUFINT |
580                                 readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
581                        sock->addr + SOCK_MMCSD_INT_ENABLE);
582                 writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8) |
583                                 (TIFM_MMCSD_FIFO_SIZE - 1),
584                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
585
586                 host->written_blocks = 0;
587                 host->flags &= ~CARD_BUSY;
588                 host->buffer_pos = 0;
589                 writel(r_data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
590                 writel(r_data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
591         }
592
593         host->req = mrq;
594         host->state = CMD;
595         queue_delayed_work(sock->wq, &host->abort_handler,
596                                 host->timeout_jiffies);
597         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
598                 sock->addr + SOCK_CONTROL);
599         tifm_sd_exec(host, mrq->cmd);
600         spin_unlock_irqrestore(&sock->lock, flags);
601         return;
602
603 err_out:
604         if (t_buffer)
605                 kunmap(r_data->sg->page);
606
607         mrq->cmd->error = MMC_ERR_TIMEOUT;
608         mmc_request_done(mmc, mrq);
609 }
610
611 static void tifm_sd_end_cmd_nodma(void *data)
612 {
613         struct tifm_sd *host = (struct tifm_sd*)data;
614         struct tifm_dev *sock = host->dev;
615         struct mmc_host *mmc = tifm_get_drvdata(sock);
616         struct mmc_request *mrq;
617         struct mmc_data *r_data = NULL;
618         unsigned long flags;
619
620         spin_lock_irqsave(&sock->lock, flags);
621
622         mrq = host->req;
623         host->req = NULL;
624         host->state = IDLE;
625
626         if (!mrq) {
627                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
628                 spin_unlock_irqrestore(&sock->lock, flags);
629                 return;
630         }
631
632         r_data = mrq->cmd->data;
633         if (r_data) {
634                 writel((~TIFM_MMCSD_BUFINT) &
635                         readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
636                         sock->addr + SOCK_MMCSD_INT_ENABLE);
637
638                 if (r_data->flags & MMC_DATA_WRITE) {
639                         r_data->bytes_xfered = host->written_blocks *
640                                                 r_data->blksz;
641                 } else {
642                         r_data->bytes_xfered = r_data->blocks -
643                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
644                         r_data->bytes_xfered *= r_data->blksz;
645                         r_data->bytes_xfered += r_data->blksz -
646                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
647                 }
648                 host->buffer = NULL;
649                 host->buffer_pos = 0;
650                 host->buffer_size = 0;
651         }
652
653         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
654                         sock->addr + SOCK_CONTROL);
655
656         spin_unlock_irqrestore(&sock->lock, flags);
657
658         if (r_data)
659                 kunmap(r_data->sg->page);
660
661         mmc_request_done(mmc, mrq);
662 }
663
664 static void tifm_sd_abort(void *data)
665 {
666         printk(KERN_ERR DRIVER_NAME
667                 ": card failed to respond for a long period of time");
668         tifm_eject(((struct tifm_sd*)data)->dev);
669 }
670
671 static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
672 {
673         struct tifm_sd *host = mmc_priv(mmc);
674         struct tifm_dev *sock = host->dev;
675         unsigned int clk_div1, clk_div2;
676         unsigned long flags;
677
678         spin_lock_irqsave(&sock->lock, flags);
679
680         dev_dbg(&sock->dev, "Setting bus width %d, power %d\n", ios->bus_width,
681                 ios->power_mode);
682         if (ios->bus_width == MMC_BUS_WIDTH_4) {
683                 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
684                        sock->addr + SOCK_MMCSD_CONFIG);
685         } else {
686                 writel((~TIFM_MMCSD_4BBUS) &
687                                 readl(sock->addr + SOCK_MMCSD_CONFIG),
688                         sock->addr + SOCK_MMCSD_CONFIG);
689         }
690
691         if (ios->clock) {
692                 clk_div1 = 20000000 / ios->clock;
693                 if (!clk_div1)
694                         clk_div1 = 1;
695
696                 clk_div2 = 24000000 / ios->clock;
697                 if (!clk_div2)
698                         clk_div2 = 1;
699
700                 if ((20000000 / clk_div1) > ios->clock)
701                         clk_div1++;
702                 if ((24000000 / clk_div2) > ios->clock)
703                         clk_div2++;
704                 if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
705                         host->clk_freq = 20000000;
706                         host->clk_div = clk_div1;
707                         writel((~TIFM_CTRL_FAST_CLK) &
708                                         readl(sock->addr + SOCK_CONTROL),
709                                 sock->addr + SOCK_CONTROL);
710                 } else {
711                         host->clk_freq = 24000000;
712                         host->clk_div = clk_div2;
713                         writel(TIFM_CTRL_FAST_CLK |
714                                         readl(sock->addr + SOCK_CONTROL),
715                                 sock->addr + SOCK_CONTROL);
716                 }
717         } else {
718                 host->clk_div = 0;
719         }
720         host->clk_div &= TIFM_MMCSD_CLKMASK;
721         writel(host->clk_div | ((~TIFM_MMCSD_CLKMASK) &
722                         readl(sock->addr + SOCK_MMCSD_CONFIG)),
723                 sock->addr + SOCK_MMCSD_CONFIG);
724
725         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
726                 host->flags |= OPENDRAIN;
727         else
728                 host->flags &= ~OPENDRAIN;
729
730         /* chip_select : maybe later */
731         //vdd
732         //power is set before probe / after remove
733         //I believe, power_off when already marked for eject is sufficient to
734         // allow removal.
735         if ((host->flags & EJECT) && ios->power_mode == MMC_POWER_OFF) {
736                 host->flags |= EJECT_DONE;
737                 wake_up_all(&host->can_eject);
738         }
739
740         spin_unlock_irqrestore(&sock->lock, flags);
741 }
742
743 static int tifm_sd_ro(struct mmc_host *mmc)
744 {
745         int rc;
746         struct tifm_sd *host = mmc_priv(mmc);
747         struct tifm_dev *sock = host->dev;
748         unsigned long flags;
749
750         spin_lock_irqsave(&sock->lock, flags);
751
752         host->flags |= (CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE));
753         rc = (host->flags & CARD_RO) ? 1 : 0;
754
755         spin_unlock_irqrestore(&sock->lock, flags);
756         return rc;
757 }
758
759 static struct mmc_host_ops tifm_sd_ops = {
760         .request = tifm_sd_request,
761         .set_ios = tifm_sd_ios,
762         .get_ro  = tifm_sd_ro
763 };
764
765 static void tifm_sd_register_host(void *data)
766 {
767         struct tifm_sd *host = (struct tifm_sd*)data;
768         struct tifm_dev *sock = host->dev;
769         struct mmc_host *mmc = tifm_get_drvdata(sock);
770         unsigned long flags;
771
772         spin_lock_irqsave(&sock->lock, flags);
773         host->flags |= HOST_REG;
774         PREPARE_WORK(&host->cmd_handler,
775                         no_dma ? tifm_sd_end_cmd_nodma : tifm_sd_end_cmd,
776                         data);
777         spin_unlock_irqrestore(&sock->lock, flags);
778         dev_dbg(&sock->dev, "adding host\n");
779         mmc_add_host(mmc);
780 }
781
782 static int tifm_sd_probe(struct tifm_dev *sock)
783 {
784         struct mmc_host *mmc;
785         struct tifm_sd *host;
786         int rc = -EIO;
787
788         if (!(TIFM_SOCK_STATE_OCCUPIED &
789                         readl(sock->addr + SOCK_PRESENT_STATE))) {
790                 printk(KERN_WARNING DRIVER_NAME ": card gone, unexpectedly\n");
791                 return rc;
792         }
793
794         mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
795         if (!mmc)
796                 return -ENOMEM;
797
798         host = mmc_priv(mmc);
799         host->dev = sock;
800         host->clk_div = 61;
801         init_waitqueue_head(&host->can_eject);
802         INIT_WORK(&host->cmd_handler, tifm_sd_register_host, host);
803         INIT_WORK(&host->abort_handler, tifm_sd_abort, host);
804
805         tifm_set_drvdata(sock, mmc);
806         sock->signal_irq = tifm_sd_signal_irq;
807
808         host->clk_freq = 20000000;
809         host->timeout_jiffies = msecs_to_jiffies(1000);
810
811         tifm_sd_ops.request = no_dma ? tifm_sd_request_nodma : tifm_sd_request;
812         mmc->ops = &tifm_sd_ops;
813         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
814         mmc->caps = MMC_CAP_4_BIT_DATA;
815         mmc->f_min = 20000000 / 60;
816         mmc->f_max = 24000000;
817         mmc->max_hw_segs = 1;
818         mmc->max_phys_segs = 1;
819         mmc->max_sectors = 127;
820         mmc->max_seg_size = mmc->max_sectors << 11; //2k maximum hw block length
821
822         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
823         writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
824         writel(host->clk_div | TIFM_MMCSD_POWER,
825                         sock->addr + SOCK_MMCSD_CONFIG);
826
827         for (rc = 0; rc < 50; rc++) {
828                 /* Wait for reset ack */
829                 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
830                         rc = 0;
831                         break;
832                 }
833                 msleep(10);
834         }
835
836         if (rc) {
837                 printk(KERN_ERR DRIVER_NAME
838                         ": card not ready - probe failed\n");
839                 mmc_free_host(mmc);
840                 return -ENODEV;
841         }
842
843         writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
844         writel(host->clk_div | TIFM_MMCSD_POWER,
845                         sock->addr + SOCK_MMCSD_CONFIG);
846         writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
847         writel(TIFM_MMCSD_DATAMASK | TIFM_MMCSD_ERRMASK,
848                         sock->addr + SOCK_MMCSD_INT_ENABLE);
849
850         writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO); // command timeout 64 clocks for now
851         writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
852         writel(host->clk_div | TIFM_MMCSD_POWER,
853                         sock->addr + SOCK_MMCSD_CONFIG);
854
855         queue_delayed_work(sock->wq, &host->abort_handler,
856                         host->timeout_jiffies);
857
858         return 0;
859 }
860
861 static int tifm_sd_host_is_down(struct tifm_dev *sock)
862 {
863         struct mmc_host *mmc = tifm_get_drvdata(sock);
864         struct tifm_sd *host = mmc_priv(mmc);
865         unsigned long flags;
866         int rc = 0;
867
868         spin_lock_irqsave(&sock->lock, flags);
869         rc = (host->flags & EJECT_DONE);
870         spin_unlock_irqrestore(&sock->lock, flags);
871         return rc;
872 }
873
874 static void tifm_sd_remove(struct tifm_dev *sock)
875 {
876         struct mmc_host *mmc = tifm_get_drvdata(sock);
877         struct tifm_sd *host = mmc_priv(mmc);
878         unsigned long flags;
879
880         spin_lock_irqsave(&sock->lock, flags);
881         host->flags |= EJECT;
882         if (host->req)
883                 queue_work(sock->wq, &host->cmd_handler);
884         spin_unlock_irqrestore(&sock->lock, flags);
885         wait_event_timeout(host->can_eject, tifm_sd_host_is_down(sock),
886                                 host->timeout_jiffies);
887
888         if (host->flags & HOST_REG)
889                 mmc_remove_host(mmc);
890
891         /* The meaning of the bit majority in this constant is unknown. */
892         writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
893                 sock->addr + SOCK_CONTROL);
894         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
895         writel(TIFM_FIFO_INT_SETALL,
896                 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
897         writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
898
899         tifm_set_drvdata(sock, NULL);
900         mmc_free_host(mmc);
901 }
902
903 static tifm_media_id tifm_sd_id_tbl[] = {
904         FM_SD, 0
905 };
906
907 static struct tifm_driver tifm_sd_driver = {
908         .driver = {
909                 .name  = DRIVER_NAME,
910                 .owner = THIS_MODULE
911         },
912         .id_table = tifm_sd_id_tbl,
913         .probe    = tifm_sd_probe,
914         .remove   = tifm_sd_remove
915 };
916
917 static int __init tifm_sd_init(void)
918 {
919         return tifm_register_driver(&tifm_sd_driver);
920 }
921
922 static void __exit tifm_sd_exit(void)
923 {
924         tifm_unregister_driver(&tifm_sd_driver);
925 }
926
927 MODULE_AUTHOR("Alex Dubov");
928 MODULE_DESCRIPTION("TI FlashMedia SD driver");
929 MODULE_LICENSE("GPL");
930 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
931 MODULE_VERSION(DRIVER_VERSION);
932
933 module_init(tifm_sd_init);
934 module_exit(tifm_sd_exit);