mmc: tifm: replace kmap with page_address
[linux-2.6.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 "0.7"
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         EJECT      = 0x0004,
83         EJECT_DONE = 0x0008,
84         CARD_BUSY  = 0x0010,
85         OPENDRAIN  = 0x0040,     /* hardware dependent value */
86         CARD_EVENT = 0x0100,     /* hardware dependent value */
87         CARD_RO    = 0x0200,     /* hardware dependent value */
88         FIFO_EVENT = 0x10000 };  /* hardware dependent value */
89
90 struct tifm_sd {
91         struct tifm_dev     *dev;
92
93         unsigned int        flags;
94         card_state_t        state;
95         unsigned int        clk_freq;
96         unsigned int        clk_div;
97         unsigned long       timeout_jiffies;
98
99         struct tasklet_struct finish_tasklet;
100         struct timer_list     timer;
101         struct mmc_request    *req;
102         wait_queue_head_t     notify;
103
104         size_t                written_blocks;
105         size_t                buffer_size;
106         size_t                buffer_pos;
107
108 };
109
110 static char* tifm_sd_data_buffer(struct mmc_data *data)
111 {
112         return page_address(data->sg->page) + data->sg->offset;
113 }
114
115 static int tifm_sd_transfer_data(struct tifm_dev *sock, struct tifm_sd *host,
116                                  unsigned int host_status)
117 {
118         struct mmc_command *cmd = host->req->cmd;
119         unsigned int t_val = 0, cnt = 0;
120         char *buffer;
121
122         if (host_status & TIFM_MMCSD_BRS) {
123                 /* in non-dma rx mode BRS fires when fifo is still not empty */
124                 if (no_dma && (cmd->data->flags & MMC_DATA_READ)) {
125                         buffer = tifm_sd_data_buffer(host->req->data);
126                         while (host->buffer_size > host->buffer_pos) {
127                                 t_val = readl(sock->addr + SOCK_MMCSD_DATA);
128                                 buffer[host->buffer_pos++] = t_val & 0xff;
129                                 buffer[host->buffer_pos++] =
130                                                         (t_val >> 8) & 0xff;
131                         }
132                 }
133                 return 1;
134         } else if (no_dma) {
135                 buffer = tifm_sd_data_buffer(host->req->data);
136                 if ((cmd->data->flags & MMC_DATA_READ) &&
137                                 (host_status & TIFM_MMCSD_AF)) {
138                         for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
139                                 t_val = readl(sock->addr + SOCK_MMCSD_DATA);
140                                 if (host->buffer_size > host->buffer_pos) {
141                                         buffer[host->buffer_pos++] =
142                                                         t_val & 0xff;
143                                         buffer[host->buffer_pos++] =
144                                                         (t_val >> 8) & 0xff;
145                                 }
146                         }
147                 } else if ((cmd->data->flags & MMC_DATA_WRITE)
148                            && (host_status & TIFM_MMCSD_AE)) {
149                         for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
150                                 if (host->buffer_size > host->buffer_pos) {
151                                         t_val = buffer[host->buffer_pos++]
152                                                 & 0x00ff;
153                                         t_val |= ((buffer[host->buffer_pos++])
154                                                   << 8) & 0xff00;
155                                         writel(t_val,
156                                                sock->addr + SOCK_MMCSD_DATA);
157                                 }
158                         }
159                 }
160         }
161         return 0;
162 }
163
164 static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
165 {
166         unsigned int rc = 0;
167
168         switch (mmc_resp_type(cmd)) {
169         case MMC_RSP_NONE:
170                 rc |= TIFM_MMCSD_RSP_R0;
171                 break;
172         case MMC_RSP_R1B:
173                 rc |= TIFM_MMCSD_RSP_BUSY; // deliberate fall-through
174         case MMC_RSP_R1:
175                 rc |= TIFM_MMCSD_RSP_R1;
176                 break;
177         case MMC_RSP_R2:
178                 rc |= TIFM_MMCSD_RSP_R2;
179                 break;
180         case MMC_RSP_R3:
181                 rc |= TIFM_MMCSD_RSP_R3;
182                 break;
183         default:
184                 BUG();
185         }
186
187         switch (mmc_cmd_type(cmd)) {
188         case MMC_CMD_BC:
189                 rc |= TIFM_MMCSD_CMD_BC;
190                 break;
191         case MMC_CMD_BCR:
192                 rc |= TIFM_MMCSD_CMD_BCR;
193                 break;
194         case MMC_CMD_AC:
195                 rc |= TIFM_MMCSD_CMD_AC;
196                 break;
197         case MMC_CMD_ADTC:
198                 rc |= TIFM_MMCSD_CMD_ADTC;
199                 break;
200         default:
201                 BUG();
202         }
203         return rc;
204 }
205
206 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
207 {
208         struct tifm_dev *sock = host->dev;
209         unsigned int cmd_mask = tifm_sd_op_flags(cmd) |
210                                 (host->flags & OPENDRAIN);
211
212         if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
213                 cmd_mask |= TIFM_MMCSD_READ;
214
215         dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
216                 cmd->opcode, cmd->arg, cmd_mask);
217
218         writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
219         writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
220         writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
221 }
222
223 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
224 {
225         cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
226                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
227         cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
228                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
229         cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
230                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
231         cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
232                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
233 }
234
235 static void tifm_sd_process_cmd(struct tifm_dev *sock, struct tifm_sd *host,
236                                        unsigned int host_status)
237 {
238         struct mmc_command *cmd = host->req->cmd;
239
240 change_state:
241         switch (host->state) {
242         case IDLE:
243                 return;
244         case CMD:
245                 if (host_status & TIFM_MMCSD_EOC) {
246                         tifm_sd_fetch_resp(cmd, sock);
247                         if (cmd->data) {
248                                 host->state = BRS;
249                         } else {
250                                 host->state = READY;
251                         }
252                         goto change_state;
253                 }
254                 break;
255         case BRS:
256                 if (tifm_sd_transfer_data(sock, host, host_status)) {
257                         if (cmd->data->flags & MMC_DATA_WRITE) {
258                                 host->state = CARD;
259                         } else {
260                                 if (no_dma) {
261                                         if (host->req->stop) {
262                                                 tifm_sd_exec(host, host->req->stop);
263                                                 host->state = SCMD;
264                                         } else {
265                                                 host->state = READY;
266                                         }
267                                 } else {
268                                         host->state = FIFO;
269                                 }
270                         }
271                         goto change_state;
272                 }
273                 break;
274         case SCMD:
275                 if (host_status & TIFM_MMCSD_EOC) {
276                         tifm_sd_fetch_resp(host->req->stop, sock);
277                         host->state = READY;
278                         goto change_state;
279                 }
280                 break;
281         case CARD:
282                 dev_dbg(&sock->dev, "waiting for CARD, have %zd blocks\n",
283                         host->written_blocks);
284                 if (!(host->flags & CARD_BUSY)
285                     && (host->written_blocks == cmd->data->blocks)) {
286                         if (no_dma) {
287                                 if (host->req->stop) {
288                                         tifm_sd_exec(host, host->req->stop);
289                                         host->state = SCMD;
290                                 } else {
291                                         host->state = READY;
292                                 }
293                         } else {
294                                 host->state = FIFO;
295                         }
296                         goto change_state;
297                 }
298                 break;
299         case FIFO:
300                 if (host->flags & FIFO_RDY) {
301                         host->flags &= ~FIFO_RDY;
302                         if (host->req->stop) {
303                                 tifm_sd_exec(host, host->req->stop);
304                                 host->state = SCMD;
305                         } else {
306                                 host->state = READY;
307                         }
308                         goto change_state;
309                 }
310                 break;
311         case READY:
312                 tasklet_schedule(&host->finish_tasklet);
313                 return;
314         }
315
316 }
317
318 /* Called from interrupt handler */
319 static void tifm_sd_signal_irq(struct tifm_dev *sock,
320                                unsigned int sock_irq_status)
321 {
322         struct tifm_sd *host;
323         unsigned int host_status = 0, fifo_status = 0;
324         int error_code = 0;
325
326         spin_lock(&sock->lock);
327         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
328
329         if (sock_irq_status & FIFO_EVENT) {
330                 fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
331                 writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
332
333                 host->flags |= fifo_status & FIFO_RDY;
334         }
335
336         if (sock_irq_status & CARD_EVENT) {
337                 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
338                 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
339
340                 if (!host->req)
341                         goto done;
342
343                 if (host_status & TIFM_MMCSD_ERRMASK) {
344                         if (host_status & TIFM_MMCSD_CERR)
345                                 error_code = MMC_ERR_FAILED;
346                         else if (host_status
347                                  & (TIFM_MMCSD_CTO | TIFM_MMCSD_DTO))
348                                 error_code = MMC_ERR_TIMEOUT;
349                         else if (host_status
350                                  & (TIFM_MMCSD_CCRC | TIFM_MMCSD_DCRC))
351                                 error_code = MMC_ERR_BADCRC;
352
353                         writel(TIFM_FIFO_INT_SETALL,
354                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
355                         writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
356
357                         if (host->req->stop) {
358                                 if (host->state == SCMD) {
359                                         host->req->stop->error = error_code;
360                                 } else if (host->state == BRS
361                                            || host->state == CARD
362                                            || host->state == FIFO) {
363                                         host->req->cmd->error = error_code;
364                                         tifm_sd_exec(host, host->req->stop);
365                                         host->state = SCMD;
366                                         goto done;
367                                 } else {
368                                         host->req->cmd->error = error_code;
369                                 }
370                         } else {
371                                 host->req->cmd->error = error_code;
372                         }
373                         host->state = READY;
374                 }
375
376                 if (host_status & TIFM_MMCSD_CB)
377                         host->flags |= CARD_BUSY;
378                 if ((host_status & TIFM_MMCSD_EOFB)
379                     && (host->flags & CARD_BUSY)) {
380                         host->written_blocks++;
381                         host->flags &= ~CARD_BUSY;
382                 }
383         }
384
385         if (host->req)
386                 tifm_sd_process_cmd(sock, host, host_status);
387 done:
388         dev_dbg(&sock->dev, "host_status %x, fifo_status %x\n",
389                 host_status, fifo_status);
390         spin_unlock(&sock->lock);
391 }
392
393 static void tifm_sd_prepare_data(struct tifm_sd *host, struct mmc_command *cmd)
394 {
395         struct tifm_dev *sock = host->dev;
396         unsigned int dest_cnt;
397
398         /* DMA style IO */
399         dev_dbg(&sock->dev, "setting dma for %d blocks\n",
400                 cmd->data->blocks);
401         writel(TIFM_FIFO_INT_SETALL,
402                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
403         writel(ilog2(cmd->data->blksz) - 2,
404                sock->addr + SOCK_FIFO_PAGE_SIZE);
405         writel(TIFM_FIFO_ENABLE, sock->addr + SOCK_FIFO_CONTROL);
406         writel(TIFM_FIFO_INTMASK, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
407
408         dest_cnt = (cmd->data->blocks) << 8;
409
410         writel(sg_dma_address(cmd->data->sg), sock->addr + SOCK_DMA_ADDRESS);
411
412         writel(cmd->data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
413         writel(cmd->data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
414
415         if (cmd->data->flags & MMC_DATA_WRITE) {
416                 writel(TIFM_MMCSD_TXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
417                 writel(dest_cnt | TIFM_DMA_TX | TIFM_DMA_EN,
418                        sock->addr + SOCK_DMA_CONTROL);
419         } else {
420                 writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
421                 writel(dest_cnt | TIFM_DMA_EN, sock->addr + SOCK_DMA_CONTROL);
422         }
423 }
424
425 static void tifm_sd_set_data_timeout(struct tifm_sd *host,
426                                      struct mmc_data *data)
427 {
428         struct tifm_dev *sock = host->dev;
429         unsigned int data_timeout = data->timeout_clks;
430
431         if (fixed_timeout)
432                 return;
433
434         data_timeout += data->timeout_ns /
435                         ((1000000000UL / host->clk_freq) * host->clk_div);
436
437         if (data_timeout < 0xffff) {
438                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
439                 writel((~TIFM_MMCSD_DPE)
440                        & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
441                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
442         } else {
443                 data_timeout = (data_timeout >> 10) + 1;
444                 if (data_timeout > 0xffff)
445                         data_timeout = 0;       /* set to unlimited */
446                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
447                 writel(TIFM_MMCSD_DPE
448                        | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
449                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
450         }
451 }
452
453 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
454 {
455         struct tifm_sd *host = mmc_priv(mmc);
456         struct tifm_dev *sock = host->dev;
457         unsigned long flags;
458         int sg_count = 0;
459         struct mmc_data *r_data = mrq->cmd->data;
460
461         spin_lock_irqsave(&sock->lock, flags);
462         if (host->flags & EJECT) {
463                 spin_unlock_irqrestore(&sock->lock, flags);
464                 goto err_out;
465         }
466
467         if (host->req) {
468                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
469                 spin_unlock_irqrestore(&sock->lock, flags);
470                 goto err_out;
471         }
472
473         if (r_data) {
474                 tifm_sd_set_data_timeout(host, r_data);
475
476                 sg_count = tifm_map_sg(sock, r_data->sg, r_data->sg_len,
477                                        mrq->cmd->flags & MMC_DATA_WRITE
478                                        ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
479                 if (sg_count != 1) {
480                         printk(KERN_ERR DRIVER_NAME
481                                 ": scatterlist map failed\n");
482                         spin_unlock_irqrestore(&sock->lock, flags);
483                         goto err_out;
484                 }
485
486                 host->written_blocks = 0;
487                 host->flags &= ~CARD_BUSY;
488                 tifm_sd_prepare_data(host, mrq->cmd);
489         }
490
491         host->req = mrq;
492         mod_timer(&host->timer, jiffies + host->timeout_jiffies);
493         host->state = CMD;
494         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
495                sock->addr + SOCK_CONTROL);
496         tifm_sd_exec(host, mrq->cmd);
497         spin_unlock_irqrestore(&sock->lock, flags);
498         return;
499
500 err_out:
501         if (sg_count > 0)
502                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
503                               (r_data->flags & MMC_DATA_WRITE)
504                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
505
506         mrq->cmd->error = MMC_ERR_TIMEOUT;
507         mmc_request_done(mmc, mrq);
508 }
509
510 static void tifm_sd_end_cmd(unsigned long data)
511 {
512         struct tifm_sd *host = (struct tifm_sd*)data;
513         struct tifm_dev *sock = host->dev;
514         struct mmc_host *mmc = tifm_get_drvdata(sock);
515         struct mmc_request *mrq;
516         struct mmc_data *r_data = NULL;
517         unsigned long flags;
518
519         spin_lock_irqsave(&sock->lock, flags);
520
521         del_timer(&host->timer);
522         mrq = host->req;
523         host->req = NULL;
524         host->state = IDLE;
525
526         if (!mrq) {
527                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
528                 spin_unlock_irqrestore(&sock->lock, flags);
529                 return;
530         }
531
532         r_data = mrq->cmd->data;
533         if (r_data) {
534                 if (r_data->flags & MMC_DATA_WRITE) {
535                         r_data->bytes_xfered = host->written_blocks
536                                                * r_data->blksz;
537                 } else {
538                         r_data->bytes_xfered = r_data->blocks -
539                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
540                         r_data->bytes_xfered *= r_data->blksz;
541                         r_data->bytes_xfered += r_data->blksz -
542                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
543                 }
544                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
545                               (r_data->flags & MMC_DATA_WRITE)
546                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
547         }
548
549         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
550                sock->addr + SOCK_CONTROL);
551
552         spin_unlock_irqrestore(&sock->lock, flags);
553         mmc_request_done(mmc, mrq);
554 }
555
556 static void tifm_sd_request_nodma(struct mmc_host *mmc, struct mmc_request *mrq)
557 {
558         struct tifm_sd *host = mmc_priv(mmc);
559         struct tifm_dev *sock = host->dev;
560         unsigned long flags;
561         struct mmc_data *r_data = mrq->cmd->data;
562
563         spin_lock_irqsave(&sock->lock, flags);
564         if (host->flags & EJECT) {
565                 spin_unlock_irqrestore(&sock->lock, flags);
566                 goto err_out;
567         }
568
569         if (host->req) {
570                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
571                 spin_unlock_irqrestore(&sock->lock, flags);
572                 goto err_out;
573         }
574
575         if (r_data) {
576                 tifm_sd_set_data_timeout(host, r_data);
577
578                 host->buffer_size = mrq->cmd->data->blocks
579                                     * mrq->cmd->data->blksz;
580
581                 writel(TIFM_MMCSD_BUFINT
582                        | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
583                        sock->addr + SOCK_MMCSD_INT_ENABLE);
584                 writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
585                        | (TIFM_MMCSD_FIFO_SIZE - 1),
586                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
587
588                 host->written_blocks = 0;
589                 host->flags &= ~CARD_BUSY;
590                 host->buffer_pos = 0;
591                 writel(r_data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
592                 writel(r_data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
593         }
594
595         host->req = mrq;
596         mod_timer(&host->timer, jiffies + host->timeout_jiffies);
597         host->state = CMD;
598         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
599                sock->addr + SOCK_CONTROL);
600         tifm_sd_exec(host, mrq->cmd);
601         spin_unlock_irqrestore(&sock->lock, flags);
602         return;
603
604 err_out:
605         mrq->cmd->error = MMC_ERR_TIMEOUT;
606         mmc_request_done(mmc, mrq);
607 }
608
609 static void tifm_sd_end_cmd_nodma(unsigned long data)
610 {
611         struct tifm_sd *host = (struct tifm_sd*)data;
612         struct tifm_dev *sock = host->dev;
613         struct mmc_host *mmc = tifm_get_drvdata(sock);
614         struct mmc_request *mrq;
615         struct mmc_data *r_data = NULL;
616         unsigned long flags;
617
618         spin_lock_irqsave(&sock->lock, flags);
619
620         del_timer(&host->timer);
621         mrq = host->req;
622         host->req = NULL;
623         host->state = IDLE;
624
625         if (!mrq) {
626                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
627                 spin_unlock_irqrestore(&sock->lock, flags);
628                 return;
629         }
630
631         r_data = mrq->cmd->data;
632         if (r_data) {
633                 writel((~TIFM_MMCSD_BUFINT) &
634                         readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
635                         sock->addr + SOCK_MMCSD_INT_ENABLE);
636
637                 if (r_data->flags & MMC_DATA_WRITE) {
638                         r_data->bytes_xfered = host->written_blocks
639                                                * r_data->blksz;
640                 } else {
641                         r_data->bytes_xfered = r_data->blocks -
642                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
643                         r_data->bytes_xfered *= r_data->blksz;
644                         r_data->bytes_xfered += r_data->blksz -
645                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
646                 }
647                 host->buffer_pos = 0;
648                 host->buffer_size = 0;
649         }
650
651         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
652                sock->addr + SOCK_CONTROL);
653
654         spin_unlock_irqrestore(&sock->lock, flags);
655
656         mmc_request_done(mmc, mrq);
657 }
658
659 static void tifm_sd_terminate(struct tifm_sd *host)
660 {
661         struct tifm_dev *sock = host->dev;
662         unsigned long flags;
663
664         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
665         mmiowb();
666         spin_lock_irqsave(&sock->lock, flags);
667         host->flags |= EJECT;
668         if (host->req) {
669                 writel(TIFM_FIFO_INT_SETALL,
670                        sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
671                 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
672                 tasklet_schedule(&host->finish_tasklet);
673         }
674         spin_unlock_irqrestore(&sock->lock, flags);
675 }
676
677 static void tifm_sd_abort(unsigned long data)
678 {
679         struct tifm_sd *host = (struct tifm_sd*)data;
680
681         printk(KERN_ERR DRIVER_NAME
682                ": card failed to respond for a long period of time");
683
684         tifm_sd_terminate(host);
685         tifm_eject(host->dev);
686 }
687
688 static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
689 {
690         struct tifm_sd *host = mmc_priv(mmc);
691         struct tifm_dev *sock = host->dev;
692         unsigned int clk_div1, clk_div2;
693         unsigned long flags;
694
695         spin_lock_irqsave(&sock->lock, flags);
696
697         dev_dbg(&sock->dev, "Setting bus width %d, power %d\n", ios->bus_width,
698                 ios->power_mode);
699         if (ios->bus_width == MMC_BUS_WIDTH_4) {
700                 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
701                        sock->addr + SOCK_MMCSD_CONFIG);
702         } else {
703                 writel((~TIFM_MMCSD_4BBUS)
704                        & readl(sock->addr + SOCK_MMCSD_CONFIG),
705                        sock->addr + SOCK_MMCSD_CONFIG);
706         }
707
708         if (ios->clock) {
709                 clk_div1 = 20000000 / ios->clock;
710                 if (!clk_div1)
711                         clk_div1 = 1;
712
713                 clk_div2 = 24000000 / ios->clock;
714                 if (!clk_div2)
715                         clk_div2 = 1;
716
717                 if ((20000000 / clk_div1) > ios->clock)
718                         clk_div1++;
719                 if ((24000000 / clk_div2) > ios->clock)
720                         clk_div2++;
721                 if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
722                         host->clk_freq = 20000000;
723                         host->clk_div = clk_div1;
724                         writel((~TIFM_CTRL_FAST_CLK)
725                                & readl(sock->addr + SOCK_CONTROL),
726                                sock->addr + SOCK_CONTROL);
727                 } else {
728                         host->clk_freq = 24000000;
729                         host->clk_div = clk_div2;
730                         writel(TIFM_CTRL_FAST_CLK
731                                | readl(sock->addr + SOCK_CONTROL),
732                                sock->addr + SOCK_CONTROL);
733                 }
734         } else {
735                 host->clk_div = 0;
736         }
737         host->clk_div &= TIFM_MMCSD_CLKMASK;
738         writel(host->clk_div
739                | ((~TIFM_MMCSD_CLKMASK)
740                   & readl(sock->addr + SOCK_MMCSD_CONFIG)),
741                sock->addr + SOCK_MMCSD_CONFIG);
742
743         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
744                 host->flags |= OPENDRAIN;
745         else
746                 host->flags &= ~OPENDRAIN;
747
748         /* chip_select : maybe later */
749         //vdd
750         //power is set before probe / after remove
751         //I believe, power_off when already marked for eject is sufficient to
752         // allow removal.
753         if ((host->flags & EJECT) && ios->power_mode == MMC_POWER_OFF) {
754                 host->flags |= EJECT_DONE;
755                 wake_up_all(&host->notify);
756         }
757
758         spin_unlock_irqrestore(&sock->lock, flags);
759 }
760
761 static int tifm_sd_ro(struct mmc_host *mmc)
762 {
763         int rc;
764         struct tifm_sd *host = mmc_priv(mmc);
765         struct tifm_dev *sock = host->dev;
766         unsigned long flags;
767
768         spin_lock_irqsave(&sock->lock, flags);
769
770         host->flags |= (CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE));
771         rc = (host->flags & CARD_RO) ? 1 : 0;
772
773         spin_unlock_irqrestore(&sock->lock, flags);
774         return rc;
775 }
776
777 static struct mmc_host_ops tifm_sd_ops = {
778         .request = tifm_sd_request,
779         .set_ios = tifm_sd_ios,
780         .get_ro  = tifm_sd_ro
781 };
782
783 static int tifm_sd_initialize_host(struct tifm_sd *host)
784 {
785         int rc;
786         unsigned int host_status = 0;
787         struct tifm_dev *sock = host->dev;
788
789         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
790         mmiowb();
791         host->clk_div = 61;
792         host->clk_freq = 20000000;
793         writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
794         writel(host->clk_div | TIFM_MMCSD_POWER,
795                sock->addr + SOCK_MMCSD_CONFIG);
796
797         /* wait up to 0.51 sec for reset */
798         for (rc = 2; rc <= 256; rc <<= 1) {
799                 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
800                         rc = 0;
801                         break;
802                 }
803                 msleep(rc);
804         }
805
806         if (rc) {
807                 printk(KERN_ERR DRIVER_NAME
808                        ": controller failed to reset\n");
809                 return -ENODEV;
810         }
811
812         writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
813         writel(host->clk_div | TIFM_MMCSD_POWER,
814                sock->addr + SOCK_MMCSD_CONFIG);
815         writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
816
817         // command timeout fixed to 64 clocks for now
818         writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO);
819         writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
820
821         /* INAB should take much less than reset */
822         for (rc = 1; rc <= 16; rc <<= 1) {
823                 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
824                 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
825                 if (!(host_status & TIFM_MMCSD_ERRMASK)
826                     && (host_status & TIFM_MMCSD_EOC)) {
827                         rc = 0;
828                         break;
829                 }
830                 msleep(rc);
831         }
832
833         if (rc) {
834                 printk(KERN_ERR DRIVER_NAME
835                        ": card not ready - probe failed on initialization\n");
836                 return -ENODEV;
837         }
838
839         writel(TIFM_MMCSD_DATAMASK | TIFM_MMCSD_ERRMASK,
840                sock->addr + SOCK_MMCSD_INT_ENABLE);
841         mmiowb();
842
843         return 0;
844 }
845
846 static int tifm_sd_probe(struct tifm_dev *sock)
847 {
848         struct mmc_host *mmc;
849         struct tifm_sd *host;
850         int rc = -EIO;
851
852         if (!(TIFM_SOCK_STATE_OCCUPIED
853               & readl(sock->addr + SOCK_PRESENT_STATE))) {
854                 printk(KERN_WARNING DRIVER_NAME ": card gone, unexpectedly\n");
855                 return rc;
856         }
857
858         mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
859         if (!mmc)
860                 return -ENOMEM;
861
862         host = mmc_priv(mmc);
863         tifm_set_drvdata(sock, mmc);
864         host->dev = sock;
865         host->timeout_jiffies = msecs_to_jiffies(1000);
866
867         init_waitqueue_head(&host->notify);
868         tasklet_init(&host->finish_tasklet,
869                      no_dma ? tifm_sd_end_cmd_nodma : tifm_sd_end_cmd,
870                      (unsigned long)host);
871         setup_timer(&host->timer, tifm_sd_abort, (unsigned long)host);
872
873         tifm_sd_ops.request = no_dma ? tifm_sd_request_nodma : tifm_sd_request;
874         mmc->ops = &tifm_sd_ops;
875         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
876         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE;
877         mmc->f_min = 20000000 / 60;
878         mmc->f_max = 24000000;
879         mmc->max_hw_segs = 1;
880         mmc->max_phys_segs = 1;
881         // limited by DMA counter - it's safer to stick with
882         // block counter has 11 bits though
883         mmc->max_blk_count = 256;
884         // 2k maximum hw block length
885         mmc->max_blk_size = 2048;
886         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
887         mmc->max_seg_size = mmc->max_req_size;
888         sock->signal_irq = tifm_sd_signal_irq;
889         rc = tifm_sd_initialize_host(host);
890
891         if (!rc)
892                 rc = mmc_add_host(mmc);
893         if (rc)
894                 goto out_free_mmc;
895
896         return 0;
897 out_free_mmc:
898         mmc_free_host(mmc);
899         return rc;
900 }
901
902 static void tifm_sd_remove(struct tifm_dev *sock)
903 {
904         struct mmc_host *mmc = tifm_get_drvdata(sock);
905         struct tifm_sd *host = mmc_priv(mmc);
906
907         del_timer_sync(&host->timer);
908         tifm_sd_terminate(host);
909         wait_event_timeout(host->notify, host->flags & EJECT_DONE,
910                            host->timeout_jiffies);
911         tasklet_kill(&host->finish_tasklet);
912         mmc_remove_host(mmc);
913
914         /* The meaning of the bit majority in this constant is unknown. */
915         writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
916                sock->addr + SOCK_CONTROL);
917
918         tifm_set_drvdata(sock, NULL);
919         mmc_free_host(mmc);
920 }
921
922 #ifdef CONFIG_PM
923
924 static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
925 {
926         struct mmc_host *mmc = tifm_get_drvdata(sock);
927         int rc;
928
929         rc = mmc_suspend_host(mmc, state);
930         /* The meaning of the bit majority in this constant is unknown. */
931         writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
932                sock->addr + SOCK_CONTROL);
933         return rc;
934 }
935
936 static int tifm_sd_resume(struct tifm_dev *sock)
937 {
938         struct mmc_host *mmc = tifm_get_drvdata(sock);
939         struct tifm_sd *host = mmc_priv(mmc);
940
941         if (sock->media_id != FM_SD
942             || tifm_sd_initialize_host(host)) {
943                 tifm_eject(sock);
944                 return 0;
945         } else {
946                 return mmc_resume_host(mmc);
947         }
948 }
949
950 #else
951
952 #define tifm_sd_suspend NULL
953 #define tifm_sd_resume NULL
954
955 #endif /* CONFIG_PM */
956
957 static tifm_media_id tifm_sd_id_tbl[] = {
958         FM_SD, 0
959 };
960
961 static struct tifm_driver tifm_sd_driver = {
962         .driver = {
963                 .name  = DRIVER_NAME,
964                 .owner = THIS_MODULE
965         },
966         .id_table = tifm_sd_id_tbl,
967         .probe    = tifm_sd_probe,
968         .remove   = tifm_sd_remove,
969         .suspend  = tifm_sd_suspend,
970         .resume   = tifm_sd_resume
971 };
972
973 static int __init tifm_sd_init(void)
974 {
975         return tifm_register_driver(&tifm_sd_driver);
976 }
977
978 static void __exit tifm_sd_exit(void)
979 {
980         tifm_unregister_driver(&tifm_sd_driver);
981 }
982
983 MODULE_AUTHOR("Alex Dubov");
984 MODULE_DESCRIPTION("TI FlashMedia SD driver");
985 MODULE_LICENSE("GPL");
986 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
987 MODULE_VERSION(DRIVER_VERSION);
988
989 module_init(tifm_sd_init);
990 module_exit(tifm_sd_exit);