Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6
[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 "0.6"
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 delayed_work   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         default:
177                 BUG();
178         }
179
180         switch (mmc_cmd_type(cmd)) {
181         case MMC_CMD_BC:
182                 rc |= TIFM_MMCSD_CMD_BC;
183                 break;
184         case MMC_CMD_BCR:
185                 rc |= TIFM_MMCSD_CMD_BCR;
186                 break;
187         case MMC_CMD_AC:
188                 rc |= TIFM_MMCSD_CMD_AC;
189                 break;
190         case MMC_CMD_ADTC:
191                 rc |= TIFM_MMCSD_CMD_ADTC;
192                 break;
193         default:
194                 BUG();
195         }
196         return rc;
197 }
198
199 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
200 {
201         struct tifm_dev *sock = host->dev;
202         unsigned int cmd_mask = tifm_sd_op_flags(cmd) |
203                                 (host->flags & OPENDRAIN);
204
205         if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
206                 cmd_mask |= TIFM_MMCSD_READ;
207
208         dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
209                                 cmd->opcode, cmd->arg, cmd_mask);
210
211         writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
212         writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
213         writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
214 }
215
216 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
217 {
218         cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
219                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
220         cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
221                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
222         cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
223                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
224         cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
225                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
226 }
227
228 static void tifm_sd_process_cmd(struct tifm_dev *sock, struct tifm_sd *host,
229                                        unsigned int host_status)
230 {
231         struct mmc_command *cmd = host->req->cmd;
232
233 change_state:
234         switch (host->state) {
235         case IDLE:
236                 return;
237         case CMD:
238                 if (host_status & TIFM_MMCSD_EOC) {
239                         tifm_sd_fetch_resp(cmd, sock);
240                         if (cmd->data) {
241                                 host->state = BRS;
242                         } else
243                                 host->state = READY;
244                         goto change_state;
245                 }
246                 break;
247         case BRS:
248                 if (tifm_sd_transfer_data(sock, host, host_status)) {
249                         if (!host->req->stop) {
250                                 if (cmd->data->flags & MMC_DATA_WRITE) {
251                                         host->state = CARD;
252                                 } else {
253                                         host->state =
254                                                 host->buffer ? READY : FIFO;
255                                 }
256                                 goto change_state;
257                         }
258                         tifm_sd_exec(host, host->req->stop);
259                         host->state = SCMD;
260                 }
261                 break;
262         case SCMD:
263                 if (host_status & TIFM_MMCSD_EOC) {
264                         tifm_sd_fetch_resp(host->req->stop, sock);
265                         if (cmd->error) {
266                                 host->state = READY;
267                         } else if (cmd->data->flags & MMC_DATA_WRITE) {
268                                 host->state = CARD;
269                         } else {
270                                 host->state = host->buffer ? READY : FIFO;
271                         }
272                         goto change_state;
273                 }
274                 break;
275         case CARD:
276                 if (!(host->flags & CARD_BUSY)
277                     && (host->written_blocks == cmd->data->blocks)) {
278                         host->state = host->buffer ? READY : FIFO;
279                         goto change_state;
280                 }
281                 break;
282         case FIFO:
283                 if (host->flags & FIFO_RDY) {
284                         host->state = READY;
285                         host->flags &= ~FIFO_RDY;
286                         goto change_state;
287                 }
288                 break;
289         case READY:
290                 queue_work(sock->wq, &host->cmd_handler);
291                 return;
292         }
293
294         queue_delayed_work(sock->wq, &host->abort_handler,
295                                 host->timeout_jiffies);
296 }
297
298 /* Called from interrupt handler */
299 static unsigned int tifm_sd_signal_irq(struct tifm_dev *sock,
300                                         unsigned int sock_irq_status)
301 {
302         struct tifm_sd *host;
303         unsigned int host_status = 0, fifo_status = 0;
304         int error_code = 0;
305
306         spin_lock(&sock->lock);
307         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
308         cancel_delayed_work(&host->abort_handler);
309
310         if (sock_irq_status & FIFO_EVENT) {
311                 fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
312                 writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
313
314                 host->flags |= fifo_status & FIFO_RDY;
315         }
316
317         if (sock_irq_status & CARD_EVENT) {
318                 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
319                 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
320
321                 if (!(host->flags & HOST_REG))
322                         queue_work(sock->wq, &host->cmd_handler);
323                 if (!host->req)
324                         goto done;
325
326                 if (host_status & TIFM_MMCSD_ERRMASK) {
327                         if (host_status & TIFM_MMCSD_CERR)
328                                 error_code = MMC_ERR_FAILED;
329                         else if (host_status &
330                                         (TIFM_MMCSD_CTO | TIFM_MMCSD_DTO))
331                                 error_code = MMC_ERR_TIMEOUT;
332                         else if (host_status &
333                                         (TIFM_MMCSD_CCRC | TIFM_MMCSD_DCRC))
334                                 error_code = MMC_ERR_BADCRC;
335
336                         writel(TIFM_FIFO_INT_SETALL,
337                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
338                         writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
339
340                         if (host->req->stop) {
341                                 if (host->state == SCMD) {
342                                         host->req->stop->error = error_code;
343                                 } else if(host->state == BRS) {
344                                         host->req->cmd->error = error_code;
345                                         tifm_sd_exec(host, host->req->stop);
346                                         queue_delayed_work(sock->wq,
347                                                 &host->abort_handler,
348                                                 host->timeout_jiffies);
349                                         host->state = SCMD;
350                                         goto done;
351                                 } else {
352                                         host->req->cmd->error = error_code;
353                                 }
354                         } else {
355                                 host->req->cmd->error = error_code;
356                         }
357                         host->state = READY;
358                 }
359
360                 if (host_status & TIFM_MMCSD_CB)
361                         host->flags |= CARD_BUSY;
362                 if ((host_status & TIFM_MMCSD_EOFB) &&
363                                 (host->flags & CARD_BUSY)) {
364                         host->written_blocks++;
365                         host->flags &= ~CARD_BUSY;
366                 }
367         }
368
369         if (host->req)
370                 tifm_sd_process_cmd(sock, host, host_status);
371 done:
372         dev_dbg(&sock->dev, "host_status %x, fifo_status %x\n",
373                         host_status, fifo_status);
374         spin_unlock(&sock->lock);
375         return sock_irq_status;
376 }
377
378 static void tifm_sd_prepare_data(struct tifm_sd *card, struct mmc_command *cmd)
379 {
380         struct tifm_dev *sock = card->dev;
381         unsigned int dest_cnt;
382
383         /* DMA style IO */
384
385         writel(TIFM_FIFO_INT_SETALL,
386                 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
387         writel(ilog2(cmd->data->blksz) - 2,
388                         sock->addr + SOCK_FIFO_PAGE_SIZE);
389         writel(TIFM_FIFO_ENABLE, sock->addr + SOCK_FIFO_CONTROL);
390         writel(TIFM_FIFO_INTMASK, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
391
392         dest_cnt = (cmd->data->blocks) << 8;
393
394         writel(sg_dma_address(cmd->data->sg), sock->addr + SOCK_DMA_ADDRESS);
395
396         writel(cmd->data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
397         writel(cmd->data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
398
399         if (cmd->data->flags & MMC_DATA_WRITE) {
400                 writel(TIFM_MMCSD_TXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
401                 writel(dest_cnt | TIFM_DMA_TX | TIFM_DMA_EN,
402                         sock->addr + SOCK_DMA_CONTROL);
403         } else {
404                 writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
405                 writel(dest_cnt | TIFM_DMA_EN, sock->addr + SOCK_DMA_CONTROL);
406         }
407 }
408
409 static void tifm_sd_set_data_timeout(struct tifm_sd *host,
410                                         struct mmc_data *data)
411 {
412         struct tifm_dev *sock = host->dev;
413         unsigned int data_timeout = data->timeout_clks;
414
415         if (fixed_timeout)
416                 return;
417
418         data_timeout += data->timeout_ns /
419                         ((1000000000 / host->clk_freq) * host->clk_div);
420         data_timeout *= 10; // call it fudge factor for now
421
422         if (data_timeout < 0xffff) {
423                 writel((~TIFM_MMCSD_DPE) &
424                                 readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
425                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
426                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
427         } else {
428                 writel(TIFM_MMCSD_DPE |
429                                 readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
430                         sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
431                 data_timeout = (data_timeout >> 10) + 1;
432                 if(data_timeout > 0xffff)
433                         data_timeout = 0;       /* set to unlimited */
434                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
435         }
436 }
437
438 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
439 {
440         struct tifm_sd *host = mmc_priv(mmc);
441         struct tifm_dev *sock = host->dev;
442         unsigned long flags;
443         int sg_count = 0;
444         struct mmc_data *r_data = mrq->cmd->data;
445
446         spin_lock_irqsave(&sock->lock, flags);
447         if (host->flags & EJECT) {
448                 spin_unlock_irqrestore(&sock->lock, flags);
449                 goto err_out;
450         }
451
452         if (host->req) {
453                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
454                 spin_unlock_irqrestore(&sock->lock, flags);
455                 goto err_out;
456         }
457
458         if (r_data) {
459                 tifm_sd_set_data_timeout(host, r_data);
460
461                 sg_count = tifm_map_sg(sock, r_data->sg, r_data->sg_len,
462                                        mrq->cmd->flags & MMC_DATA_WRITE
463                                        ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
464                 if (sg_count != 1) {
465                         printk(KERN_ERR DRIVER_NAME
466                                 ": scatterlist map failed\n");
467                         spin_unlock_irqrestore(&sock->lock, flags);
468                         goto err_out;
469                 }
470
471                 host->written_blocks = 0;
472                 host->flags &= ~CARD_BUSY;
473                 tifm_sd_prepare_data(host, mrq->cmd);
474         }
475
476         host->req = mrq;
477         host->state = CMD;
478         queue_delayed_work(sock->wq, &host->abort_handler,
479                                 host->timeout_jiffies);
480         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
481                 sock->addr + SOCK_CONTROL);
482         tifm_sd_exec(host, mrq->cmd);
483         spin_unlock_irqrestore(&sock->lock, flags);
484         return;
485
486 err_out:
487         if (sg_count > 0)
488                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
489                               (r_data->flags & MMC_DATA_WRITE)
490                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
491
492         mrq->cmd->error = MMC_ERR_TIMEOUT;
493         mmc_request_done(mmc, mrq);
494 }
495
496 static void tifm_sd_end_cmd(struct work_struct *work)
497 {
498         struct tifm_sd *host = container_of(work, struct tifm_sd, cmd_handler);
499         struct tifm_dev *sock = host->dev;
500         struct mmc_host *mmc = tifm_get_drvdata(sock);
501         struct mmc_request *mrq;
502         struct mmc_data *r_data = NULL;
503         unsigned long flags;
504
505         spin_lock_irqsave(&sock->lock, flags);
506
507         mrq = host->req;
508         host->req = NULL;
509         host->state = IDLE;
510
511         if (!mrq) {
512                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
513                 spin_unlock_irqrestore(&sock->lock, flags);
514                 return;
515         }
516
517         r_data = mrq->cmd->data;
518         if (r_data) {
519                 if (r_data->flags & MMC_DATA_WRITE) {
520                         r_data->bytes_xfered = host->written_blocks *
521                                                 r_data->blksz;
522                 } else {
523                         r_data->bytes_xfered = r_data->blocks -
524                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
525                         r_data->bytes_xfered *= r_data->blksz;
526                         r_data->bytes_xfered += r_data->blksz -
527                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
528                 }
529                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
530                               (r_data->flags & MMC_DATA_WRITE)
531                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
532         }
533
534         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
535                         sock->addr + SOCK_CONTROL);
536
537         spin_unlock_irqrestore(&sock->lock, flags);
538         mmc_request_done(mmc, mrq);
539 }
540
541 static void tifm_sd_request_nodma(struct mmc_host *mmc, struct mmc_request *mrq)
542 {
543         struct tifm_sd *host = mmc_priv(mmc);
544         struct tifm_dev *sock = host->dev;
545         unsigned long flags;
546         struct mmc_data *r_data = mrq->cmd->data;
547         char *t_buffer = NULL;
548
549         if (r_data) {
550                 t_buffer = kmap(r_data->sg->page);
551                 if (!t_buffer) {
552                         printk(KERN_ERR DRIVER_NAME ": kmap failed\n");
553                         goto err_out;
554                 }
555         }
556
557         spin_lock_irqsave(&sock->lock, flags);
558         if (host->flags & EJECT) {
559                 spin_unlock_irqrestore(&sock->lock, flags);
560                 goto err_out;
561         }
562
563         if (host->req) {
564                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
565                 spin_unlock_irqrestore(&sock->lock, flags);
566                 goto err_out;
567         }
568
569         if (r_data) {
570                 tifm_sd_set_data_timeout(host, r_data);
571
572                 host->buffer = t_buffer + r_data->sg->offset;
573                 host->buffer_size = mrq->cmd->data->blocks *
574                                         mrq->cmd->data->blksz;
575
576                 writel(TIFM_MMCSD_BUFINT |
577                                 readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
578                        sock->addr + SOCK_MMCSD_INT_ENABLE);
579                 writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8) |
580                                 (TIFM_MMCSD_FIFO_SIZE - 1),
581                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
582
583                 host->written_blocks = 0;
584                 host->flags &= ~CARD_BUSY;
585                 host->buffer_pos = 0;
586                 writel(r_data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
587                 writel(r_data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
588         }
589
590         host->req = mrq;
591         host->state = CMD;
592         queue_delayed_work(sock->wq, &host->abort_handler,
593                                 host->timeout_jiffies);
594         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
595                 sock->addr + SOCK_CONTROL);
596         tifm_sd_exec(host, mrq->cmd);
597         spin_unlock_irqrestore(&sock->lock, flags);
598         return;
599
600 err_out:
601         if (t_buffer)
602                 kunmap(r_data->sg->page);
603
604         mrq->cmd->error = MMC_ERR_TIMEOUT;
605         mmc_request_done(mmc, mrq);
606 }
607
608 static void tifm_sd_end_cmd_nodma(struct work_struct *work)
609 {
610         struct tifm_sd *host = container_of(work, struct tifm_sd, cmd_handler);
611         struct tifm_dev *sock = host->dev;
612         struct mmc_host *mmc = tifm_get_drvdata(sock);
613         struct mmc_request *mrq;
614         struct mmc_data *r_data = NULL;
615         unsigned long flags;
616
617         spin_lock_irqsave(&sock->lock, flags);
618
619         mrq = host->req;
620         host->req = NULL;
621         host->state = IDLE;
622
623         if (!mrq) {
624                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
625                 spin_unlock_irqrestore(&sock->lock, flags);
626                 return;
627         }
628
629         r_data = mrq->cmd->data;
630         if (r_data) {
631                 writel((~TIFM_MMCSD_BUFINT) &
632                         readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
633                         sock->addr + SOCK_MMCSD_INT_ENABLE);
634
635                 if (r_data->flags & MMC_DATA_WRITE) {
636                         r_data->bytes_xfered = host->written_blocks *
637                                                 r_data->blksz;
638                 } else {
639                         r_data->bytes_xfered = r_data->blocks -
640                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
641                         r_data->bytes_xfered *= r_data->blksz;
642                         r_data->bytes_xfered += r_data->blksz -
643                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
644                 }
645                 host->buffer = NULL;
646                 host->buffer_pos = 0;
647                 host->buffer_size = 0;
648         }
649
650         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
651                         sock->addr + SOCK_CONTROL);
652
653         spin_unlock_irqrestore(&sock->lock, flags);
654
655         if (r_data)
656                 kunmap(r_data->sg->page);
657
658         mmc_request_done(mmc, mrq);
659 }
660
661 static void tifm_sd_abort(struct work_struct *work)
662 {
663         struct tifm_sd *host =
664                 container_of(work, struct tifm_sd, abort_handler.work);
665
666         printk(KERN_ERR DRIVER_NAME
667                 ": card failed to respond for a long period of time");
668         tifm_eject(host->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(struct work_struct *work)
766 {
767         struct tifm_sd *host = container_of(work, struct tifm_sd, cmd_handler);
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         spin_unlock_irqrestore(&sock->lock, flags);
777         dev_dbg(&sock->dev, "adding host\n");
778         mmc_add_host(mmc);
779 }
780
781 static int tifm_sd_probe(struct tifm_dev *sock)
782 {
783         struct mmc_host *mmc;
784         struct tifm_sd *host;
785         int rc = -EIO;
786
787         if (!(TIFM_SOCK_STATE_OCCUPIED &
788                         readl(sock->addr + SOCK_PRESENT_STATE))) {
789                 printk(KERN_WARNING DRIVER_NAME ": card gone, unexpectedly\n");
790                 return rc;
791         }
792
793         mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
794         if (!mmc)
795                 return -ENOMEM;
796
797         host = mmc_priv(mmc);
798         host->dev = sock;
799         host->clk_div = 61;
800         init_waitqueue_head(&host->can_eject);
801         INIT_WORK(&host->cmd_handler, tifm_sd_register_host);
802         INIT_DELAYED_WORK(&host->abort_handler, tifm_sd_abort);
803
804         tifm_set_drvdata(sock, mmc);
805         sock->signal_irq = tifm_sd_signal_irq;
806
807         host->clk_freq = 20000000;
808         host->timeout_jiffies = msecs_to_jiffies(1000);
809
810         tifm_sd_ops.request = no_dma ? tifm_sd_request_nodma : tifm_sd_request;
811         mmc->ops = &tifm_sd_ops;
812         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
813         mmc->caps = MMC_CAP_4_BIT_DATA;
814         mmc->f_min = 20000000 / 60;
815         mmc->f_max = 24000000;
816         mmc->max_hw_segs = 1;
817         mmc->max_phys_segs = 1;
818         mmc->max_sectors = 127;
819         mmc->max_seg_size = mmc->max_sectors << 11; //2k maximum hw block length
820
821         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
822         writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
823         writel(host->clk_div | TIFM_MMCSD_POWER,
824                         sock->addr + SOCK_MMCSD_CONFIG);
825
826         for (rc = 0; rc < 50; rc++) {
827                 /* Wait for reset ack */
828                 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
829                         rc = 0;
830                         break;
831                 }
832                 msleep(10);
833         }
834
835         if (rc) {
836                 printk(KERN_ERR DRIVER_NAME
837                         ": card not ready - probe failed\n");
838                 mmc_free_host(mmc);
839                 return -ENODEV;
840         }
841
842         writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
843         writel(host->clk_div | TIFM_MMCSD_POWER,
844                         sock->addr + SOCK_MMCSD_CONFIG);
845         writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
846         writel(TIFM_MMCSD_DATAMASK | TIFM_MMCSD_ERRMASK,
847                         sock->addr + SOCK_MMCSD_INT_ENABLE);
848
849         writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO); // command timeout 64 clocks for now
850         writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
851         writel(host->clk_div | TIFM_MMCSD_POWER,
852                         sock->addr + SOCK_MMCSD_CONFIG);
853
854         queue_delayed_work(sock->wq, &host->abort_handler,
855                         host->timeout_jiffies);
856
857         return 0;
858 }
859
860 static int tifm_sd_host_is_down(struct tifm_dev *sock)
861 {
862         struct mmc_host *mmc = tifm_get_drvdata(sock);
863         struct tifm_sd *host = mmc_priv(mmc);
864         unsigned long flags;
865         int rc = 0;
866
867         spin_lock_irqsave(&sock->lock, flags);
868         rc = (host->flags & EJECT_DONE);
869         spin_unlock_irqrestore(&sock->lock, flags);
870         return rc;
871 }
872
873 static void tifm_sd_remove(struct tifm_dev *sock)
874 {
875         struct mmc_host *mmc = tifm_get_drvdata(sock);
876         struct tifm_sd *host = mmc_priv(mmc);
877         unsigned long flags;
878
879         spin_lock_irqsave(&sock->lock, flags);
880         host->flags |= EJECT;
881         if (host->req)
882                 queue_work(sock->wq, &host->cmd_handler);
883         spin_unlock_irqrestore(&sock->lock, flags);
884         wait_event_timeout(host->can_eject, tifm_sd_host_is_down(sock),
885                                 host->timeout_jiffies);
886
887         if (host->flags & HOST_REG)
888                 mmc_remove_host(mmc);
889
890         /* The meaning of the bit majority in this constant is unknown. */
891         writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
892                 sock->addr + SOCK_CONTROL);
893         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
894         writel(TIFM_FIFO_INT_SETALL,
895                 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
896         writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
897
898         tifm_set_drvdata(sock, NULL);
899         mmc_free_host(mmc);
900 }
901
902 static tifm_media_id tifm_sd_id_tbl[] = {
903         FM_SD, 0
904 };
905
906 static struct tifm_driver tifm_sd_driver = {
907         .driver = {
908                 .name  = DRIVER_NAME,
909                 .owner = THIS_MODULE
910         },
911         .id_table = tifm_sd_id_tbl,
912         .probe    = tifm_sd_probe,
913         .remove   = tifm_sd_remove
914 };
915
916 static int __init tifm_sd_init(void)
917 {
918         return tifm_register_driver(&tifm_sd_driver);
919 }
920
921 static void __exit tifm_sd_exit(void)
922 {
923         tifm_unregister_driver(&tifm_sd_driver);
924 }
925
926 MODULE_AUTHOR("Alex Dubov");
927 MODULE_DESCRIPTION("TI FlashMedia SD driver");
928 MODULE_LICENSE("GPL");
929 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
930 MODULE_VERSION(DRIVER_VERSION);
931
932 module_init(tifm_sd_init);
933 module_exit(tifm_sd_exit);