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[s3c24xx] glamo-mmc: Limit clock rate.
[openwrt.git] / target / linux / s3c24xx / files-2.6.30 / drivers / mfd / glamo / glamo-mci.c
1 /*
2 * linux/drivers/mmc/host/glamo-mmc.c - Glamo MMC driver
3 *
4 * Copyright (C) 2007 Openmoko, Inc, Andy Green <andy@openmoko.com>
5 * Based on S3C MMC driver that was:
6 * Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk@maintech.de>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/module.h>
14 #include <linux/mmc/mmc.h>
15 #include <linux/mmc/sd.h>
16 #include <linux/mmc/host.h>
17 #include <linux/platform_device.h>
18 #include <linux/irq.h>
19 #include <linux/delay.h>
20 #include <linux/interrupt.h>
21 #include <linux/workqueue.h>
22 #include <linux/crc7.h>
23 #include <linux/scatterlist.h>
24 #include <linux/io.h>
25 #include <linux/regulator/consumer.h>
26 #include <linux/mfd/glamo.h>
27
28 #include "glamo-core.h"
29 #include "glamo-regs.h"
30
31 #define DRIVER_NAME "glamo-mci"
32
33 struct glamo_mci_host {
34 struct platform_device *pdev;
35 struct glamo_mmc_platform_data *pdata;
36 struct mmc_host *mmc;
37 struct resource *mmio_mem;
38 struct resource *data_mem;
39 void __iomem *mmio_base;
40 u16 __iomem *data_base;
41
42 struct regulator *regulator;
43 struct mmc_request *mrq;
44
45 unsigned int clk_rate;
46
47 unsigned short vdd;
48 char power_mode;
49
50 unsigned char request_counter;
51
52 struct timer_list disable_timer;
53
54 struct work_struct irq_work;
55 struct work_struct read_work;
56
57 unsigned clk_enabled : 1;
58 };
59
60 static void glamo_mci_send_request(struct mmc_host *mmc, struct mmc_request* mrq);
61 static void glamo_mci_send_command(struct glamo_mci_host *host,
62 struct mmc_command *cmd);
63
64 /*
65 * Max SD clock rate
66 *
67 * held at /(3 + 1) due to concerns of 100R recommended series resistor
68 * allows 16MHz @ 4-bit --> 8MBytes/sec raw
69 *
70 * you can override this on kernel commandline using
71 *
72 * glamo_mci.sd_max_clk=10000000
73 *
74 * for example
75 */
76
77 static int sd_max_clk = 21000000;
78 module_param(sd_max_clk, int, 0644);
79
80 /*
81 * Slow SD clock rate
82 *
83 * you can override this on kernel commandline using
84 *
85 * glamo_mci.sd_slow_ratio=8
86 *
87 * for example
88 *
89 * platform callback is used to decide effective clock rate, if not
90 * defined then max is used, if defined and returns nonzero, rate is
91 * divided by this factor
92 */
93
94 static int sd_slow_ratio = 8;
95 module_param(sd_slow_ratio, int, 0644);
96
97 /*
98 * Post-power SD clock rate
99 *
100 * you can override this on kernel commandline using
101 *
102 * glamo_mci.sd_post_power_clock=1000000
103 *
104 * for example
105 *
106 * After changing power to card, clock is held at this rate until first bulk
107 * transfer completes
108 */
109
110 static int sd_post_power_clock = 1000000;
111 module_param(sd_post_power_clock, int, 0644);
112
113
114 static inline void glamo_reg_write(struct glamo_mci_host *glamo,
115 u_int16_t reg, u_int16_t val)
116 {
117 writew(val, glamo->mmio_base + reg);
118 }
119
120 static inline u_int16_t glamo_reg_read(struct glamo_mci_host *glamo,
121 u_int16_t reg)
122 {
123 return readw(glamo->mmio_base + reg);
124 }
125
126 static void glamo_reg_set_bit_mask(struct glamo_mci_host *glamo,
127 u_int16_t reg, u_int16_t mask,
128 u_int16_t val)
129 {
130 u_int16_t tmp;
131
132 val &= mask;
133
134 tmp = glamo_reg_read(glamo, reg);
135 tmp &= ~mask;
136 tmp |= val;
137 glamo_reg_write(glamo, reg, tmp);
138 }
139
140 static void glamo_mci_clock_disable(struct glamo_mci_host *host) {
141 if (host->clk_enabled) {
142 glamo_engine_div_disable(host->pdata->core, GLAMO_ENGINE_MMC);
143 host->clk_enabled = 0;
144 }
145 }
146
147 static void glamo_mci_clock_enable(struct glamo_mci_host *host) {
148 del_timer_sync(&host->disable_timer);
149
150 if (!host->clk_enabled) {
151 glamo_engine_div_enable(host->pdata->core, GLAMO_ENGINE_MMC);
152 host->clk_enabled = 1;
153 }
154 }
155
156 static void glamo_mci_disable_timer(unsigned long data) {
157 struct glamo_mci_host *host = (struct glamo_mci_host *)data;
158 glamo_mci_clock_disable(host);
159 }
160
161
162 static void do_pio_read(struct glamo_mci_host *host, struct mmc_data *data)
163 {
164 struct scatterlist *sg;
165 u16 __iomem *from_ptr = host->data_base;
166 void *sg_pointer;
167
168 dev_dbg(&host->pdev->dev, "pio_read():\n");
169 for (sg = data->sg; sg; sg = sg_next(sg)) {
170 sg_pointer = page_address(sg_page(sg)) + sg->offset;
171
172
173 memcpy(sg_pointer, from_ptr, sg->length);
174 from_ptr += sg->length >> 1;
175
176 data->bytes_xfered += sg->length;
177 }
178
179 dev_dbg(&host->pdev->dev, "pio_read(): "
180 "complete (no more data).\n");
181 }
182
183 static void do_pio_write(struct glamo_mci_host *host, struct mmc_data *data)
184 {
185 struct scatterlist *sg;
186 u16 __iomem *to_ptr = host->data_base;
187 void *sg_pointer;
188
189 dev_dbg(&host->pdev->dev, "pio_write():\n");
190 for (sg = data->sg; sg; sg = sg_next(sg)) {
191 sg_pointer = page_address(sg_page(sg)) + sg->offset;
192
193 data->bytes_xfered += sg->length;
194
195 memcpy(to_ptr, sg_pointer, sg->length);
196 to_ptr += sg->length >> 1;
197 }
198
199 dev_dbg(&host->pdev->dev, "pio_write(): complete\n");
200 }
201
202 static int glamo_mci_set_card_clock(struct glamo_mci_host *host, int freq)
203 {
204 int real_rate = 0;
205
206 if (freq) {
207 glamo_mci_clock_enable(host);
208 real_rate = glamo_engine_reclock(host->pdata->core, GLAMO_ENGINE_MMC, freq);
209 } else {
210 glamo_mci_clock_disable(host);
211 }
212
213 return real_rate;
214 }
215
216 static void glamo_mci_request_done(struct glamo_mci_host *host, struct
217 mmc_request *mrq) {
218 mod_timer(&host->disable_timer, jiffies + HZ / 16);
219 mmc_request_done(host->mmc, mrq);
220 }
221
222
223 static void glamo_mci_irq_worker(struct work_struct *work)
224 {
225 struct glamo_mci_host *host = container_of(work, struct glamo_mci_host,
226 irq_work);
227 struct mmc_command *cmd;
228 uint16_t status;
229 if (!host->mrq || !host->mrq->cmd)
230 return;
231
232 cmd = host->mrq->cmd;
233
234 #if 0
235 if (cmd->data->flags & MMC_DATA_READ) {
236 return;
237 }
238 #endif
239
240 status = glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1);
241 dev_dbg(&host->pdev->dev, "status = 0x%04x\n", status);
242
243 /* we ignore a data timeout report if we are also told the data came */
244 if (status & GLAMO_STAT1_MMC_RB_DRDY)
245 status &= ~GLAMO_STAT1_MMC_DTOUT;
246
247 if (status & (GLAMO_STAT1_MMC_RTOUT | GLAMO_STAT1_MMC_DTOUT))
248 cmd->error = -ETIMEDOUT;
249 if (status & (GLAMO_STAT1_MMC_BWERR | GLAMO_STAT1_MMC_BRERR)) {
250 cmd->error = -EILSEQ;
251 }
252 if (cmd->error) {
253 dev_info(&host->pdev->dev, "Error after cmd: 0x%x\n", status);
254 goto done;
255 }
256
257 /* issue STOP if we have been given one to use */
258 if (host->mrq->stop) {
259 glamo_mci_send_command(host, host->mrq->stop);
260 }
261
262 if (cmd->data->flags & MMC_DATA_READ)
263 do_pio_read(host, cmd->data);
264
265 done:
266 host->mrq = NULL;
267 glamo_mci_request_done(host, cmd->mrq);
268 }
269
270 static void glamo_mci_read_worker(struct work_struct *work)
271 {
272 struct glamo_mci_host *host = container_of(work, struct glamo_mci_host,
273 read_work);
274 struct mmc_command *cmd;
275 uint16_t status;
276 uint16_t blocks_ready;
277 size_t data_read = 0;
278 size_t data_ready;
279 struct scatterlist *sg;
280 u16 __iomem *from_ptr = host->data_base;
281 void *sg_pointer;
282
283
284 cmd = host->mrq->cmd;
285 sg = cmd->data->sg;
286 do {
287 status = glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1);
288
289 if (status & (GLAMO_STAT1_MMC_RTOUT | GLAMO_STAT1_MMC_DTOUT))
290 cmd->error = -ETIMEDOUT;
291 if (status & (GLAMO_STAT1_MMC_BWERR | GLAMO_STAT1_MMC_BRERR))
292 cmd->error = -EILSEQ;
293 if (cmd->error) {
294 dev_info(&host->pdev->dev, "Error after cmd: 0x%x\n", status);
295 goto done;
296 }
297
298 blocks_ready = glamo_reg_read(host, GLAMO_REG_MMC_RB_BLKCNT);
299 data_ready = blocks_ready * cmd->data->blksz;
300
301 if (data_ready == data_read)
302 yield();
303
304 while(sg && data_read + sg->length <= data_ready) {
305 sg_pointer = page_address(sg_page(sg)) + sg->offset;
306 memcpy(sg_pointer, from_ptr, sg->length);
307 from_ptr += sg->length >> 1;
308
309 data_read += sg->length;
310 sg = sg_next(sg);
311 }
312
313 } while(sg);
314 cmd->data->bytes_xfered = data_read;
315
316 do {
317 status = glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1);
318 } while (!(status & GLAMO_STAT1_MMC_IDLE));
319
320 if (host->mrq->stop)
321 glamo_mci_send_command(host, host->mrq->stop);
322
323 do {
324 status = glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1);
325 } while (!(status & GLAMO_STAT1_MMC_IDLE));
326 done:
327 host->mrq = NULL;
328 glamo_mci_request_done(host, cmd->mrq);
329 }
330
331 static irqreturn_t glamo_mci_irq(int irq, void *devid)
332 {
333 struct glamo_mci_host *host = (struct glamo_mci_host*)devid;
334 schedule_work(&host->irq_work);
335
336 return IRQ_HANDLED;
337 }
338
339 static void glamo_mci_send_command(struct glamo_mci_host *host,
340 struct mmc_command *cmd)
341 {
342 u8 u8a[6];
343 u16 fire = 0;
344 unsigned int timeout = 1000000;
345 u16 * reg_resp = (u16 *)(host->mmio_base + GLAMO_REG_MMC_CMD_RSP1);
346 u16 status;
347 int triggers_int = 1;
348
349 /* if we can't do it, reject as busy */
350 if (!glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1) &
351 GLAMO_STAT1_MMC_IDLE) {
352 cmd->error = -EBUSY;
353 return;
354 }
355
356 /* create an array in wire order for CRC computation */
357 u8a[0] = 0x40 | (cmd->opcode & 0x3f);
358 u8a[1] = (u8)(cmd->arg >> 24);
359 u8a[2] = (u8)(cmd->arg >> 16);
360 u8a[3] = (u8)(cmd->arg >> 8);
361 u8a[4] = (u8)cmd->arg;
362 u8a[5] = (crc7(0, u8a, 5) << 1) | 0x01; /* crc7 on first 5 bytes of packet */
363
364 /* issue the wire-order array including CRC in register order */
365 glamo_reg_write(host, GLAMO_REG_MMC_CMD_REG1, ((u8a[4] << 8) | u8a[5]));
366 glamo_reg_write(host, GLAMO_REG_MMC_CMD_REG2, ((u8a[2] << 8) | u8a[3]));
367 glamo_reg_write(host, GLAMO_REG_MMC_CMD_REG3, ((u8a[0] << 8) | u8a[1]));
368
369 /* command index toggle */
370 fire |= (host->request_counter & 1) << 12;
371
372 /* set type of command */
373 switch (mmc_cmd_type(cmd)) {
374 case MMC_CMD_BC:
375 fire |= GLAMO_FIRE_MMC_CMDT_BNR;
376 break;
377 case MMC_CMD_BCR:
378 fire |= GLAMO_FIRE_MMC_CMDT_BR;
379 break;
380 case MMC_CMD_AC:
381 fire |= GLAMO_FIRE_MMC_CMDT_AND;
382 break;
383 case MMC_CMD_ADTC:
384 fire |= GLAMO_FIRE_MMC_CMDT_AD;
385 break;
386 }
387 /*
388 * if it expects a response, set the type expected
389 *
390 * R1, Length : 48bit, Normal response
391 * R1b, Length : 48bit, same R1, but added card busy status
392 * R2, Length : 136bit (really 128 bits with CRC snipped)
393 * R3, Length : 48bit (OCR register value)
394 * R4, Length : 48bit, SDIO_OP_CONDITION, Reverse SDIO Card
395 * R5, Length : 48bit, IO_RW_DIRECTION, Reverse SDIO Card
396 * R6, Length : 48bit (RCA register)
397 * R7, Length : 48bit (interface condition, VHS(voltage supplied),
398 * check pattern, CRC7)
399 */
400 switch (mmc_resp_type(cmd)) {
401 case MMC_RSP_R1: /* same index as R6 and R7 */
402 fire |= GLAMO_FIRE_MMC_RSPT_R1;
403 break;
404 case MMC_RSP_R1B:
405 fire |= GLAMO_FIRE_MMC_RSPT_R1b;
406 break;
407 case MMC_RSP_R2:
408 fire |= GLAMO_FIRE_MMC_RSPT_R2;
409 break;
410 case MMC_RSP_R3:
411 fire |= GLAMO_FIRE_MMC_RSPT_R3;
412 break;
413 /* R4 and R5 supported by chip not defined in linux/mmc/core.h (sdio) */
414 }
415 /*
416 * From the command index, set up the command class in the host ctrllr
417 *
418 * missing guys present on chip but couldn't figure out how to use yet:
419 * 0x0 "stream read"
420 * 0x9 "cancel running command"
421 */
422 switch (cmd->opcode) {
423 case MMC_READ_SINGLE_BLOCK:
424 fire |= GLAMO_FIRE_MMC_CC_SBR; /* single block read */
425 break;
426 case MMC_SWITCH: /* 64 byte payload */
427 case SD_APP_SEND_SCR:
428 case MMC_READ_MULTIPLE_BLOCK:
429 /* we will get an interrupt off this */
430 if (!cmd->mrq->stop)
431 /* multiblock no stop */
432 fire |= GLAMO_FIRE_MMC_CC_MBRNS;
433 else
434 /* multiblock with stop */
435 fire |= GLAMO_FIRE_MMC_CC_MBRS;
436 break;
437 case MMC_WRITE_BLOCK:
438 fire |= GLAMO_FIRE_MMC_CC_SBW; /* single block write */
439 break;
440 case MMC_WRITE_MULTIPLE_BLOCK:
441 if (cmd->mrq->stop)
442 /* multiblock with stop */
443 fire |= GLAMO_FIRE_MMC_CC_MBWS;
444 else
445 /* multiblock NO stop-- 'RESERVED'? */
446 fire |= GLAMO_FIRE_MMC_CC_MBWNS;
447 break;
448 case MMC_STOP_TRANSMISSION:
449 fire |= GLAMO_FIRE_MMC_CC_STOP; /* STOP */
450 triggers_int = 0;
451 break;
452 default:
453 fire |= GLAMO_FIRE_MMC_CC_BASIC; /* "basic command" */
454 triggers_int = 0;
455 break;
456 }
457
458 if (cmd->data)
459 host->mrq = cmd->mrq;
460
461 /* always largest timeout */
462 glamo_reg_write(host, GLAMO_REG_MMC_TIMEOUT, 0xfff);
463
464 /* Generate interrupt on txfer */
465 glamo_reg_set_bit_mask(host, GLAMO_REG_MMC_BASIC, 0xff36,
466 0x0800 |
467 GLAMO_BASIC_MMC_NO_CLK_RD_WAIT |
468 GLAMO_BASIC_MMC_EN_COMPL_INT |
469 GLAMO_BASIC_MMC_EN_DATA_PUPS |
470 GLAMO_BASIC_MMC_EN_CMD_PUP);
471
472 /* send the command out on the wire */
473 /* dev_info(&host->pdev->dev, "Using FIRE %04X\n", fire); */
474 glamo_reg_write(host, GLAMO_REG_MMC_CMD_FIRE, fire);
475
476 /* we are deselecting card? because it isn't going to ack then... */
477 if ((cmd->opcode == 7) && (cmd->arg == 0))
478 return;
479
480 /*
481 * we must spin until response is ready or timed out
482 * -- we don't get interrupts unless there is a bulk rx
483 */
484 do
485 status = glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1);
486 while (((((status >> 15) & 1) != (host->request_counter & 1)) ||
487 (!(status & (GLAMO_STAT1_MMC_RB_RRDY |
488 GLAMO_STAT1_MMC_RTOUT |
489 GLAMO_STAT1_MMC_DTOUT |
490 GLAMO_STAT1_MMC_BWERR |
491 GLAMO_STAT1_MMC_BRERR)))) && (timeout--));
492
493 if ((status & (GLAMO_STAT1_MMC_RTOUT |
494 GLAMO_STAT1_MMC_DTOUT)) ||
495 (timeout == 0)) {
496 cmd->error = -ETIMEDOUT;
497 } else if (status & (GLAMO_STAT1_MMC_BWERR | GLAMO_STAT1_MMC_BRERR)) {
498 cmd->error = -EILSEQ;
499 }
500
501 if (cmd->flags & MMC_RSP_PRESENT) {
502 if (cmd->flags & MMC_RSP_136) {
503 cmd->resp[3] = readw(&reg_resp[0]) |
504 (readw(&reg_resp[1]) << 16);
505 cmd->resp[2] = readw(&reg_resp[2]) |
506 (readw(&reg_resp[3]) << 16);
507 cmd->resp[1] = readw(&reg_resp[4]) |
508 (readw(&reg_resp[5]) << 16);
509 cmd->resp[0] = readw(&reg_resp[6]) |
510 (readw(&reg_resp[7]) << 16);
511 } else {
512 cmd->resp[0] = (readw(&reg_resp[0]) >> 8) |
513 (readw(&reg_resp[1]) << 8) |
514 ((readw(&reg_resp[2])) << 24);
515 }
516 }
517
518 #if 0
519 /* We'll only get an interrupt when all data has been transfered.
520 By starting to copy data when it's avaiable we can increase throughput by
521 up to 30%. */
522 if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
523 schedule_work(&host->read_work);
524 #endif
525
526 }
527
528 static int glamo_mci_prepare_pio(struct glamo_mci_host *host,
529 struct mmc_data *data)
530 {
531 /* set up the block info */
532 glamo_reg_write(host, GLAMO_REG_MMC_DATBLKLEN, data->blksz);
533 glamo_reg_write(host, GLAMO_REG_MMC_DATBLKCNT, data->blocks);
534
535 data->bytes_xfered = 0;
536
537 /* if write, prep the write into the shared RAM before the command */
538 if (data->flags & MMC_DATA_WRITE) {
539 do_pio_write(host, data);
540 }
541
542 dev_dbg(&host->pdev->dev, "(blksz=%d, count=%d)\n",
543 data->blksz, data->blocks);
544 return 0;
545 }
546
547 static int glamo_mci_irq_poll(struct glamo_mci_host *host,
548 struct mmc_command *cmd)
549 {
550 int timeout = 1000000;
551 /*
552 * if the glamo INT# line isn't wired (*cough* it can happen)
553 * I'm afraid we have to spin on the IRQ status bit and "be
554 * our own INT# line"
555 */
556 /*
557 * we have faith we will get an "interrupt"...
558 * but something insane like suspend problems can mean
559 * we spin here forever, so we timeout after a LONG time
560 */
561 while ((!(readw(host->pdata->core->base +
562 GLAMO_REG_IRQ_STATUS) & GLAMO_IRQ_MMC)) &&
563 (timeout--));
564
565 if (timeout < 0) {
566 if (cmd->data->error)
567 cmd->data->error = -ETIMEDOUT;
568 dev_err(&host->pdev->dev, "Payload timeout\n");
569 return -ETIMEDOUT;
570 }
571 /* ack this interrupt source */
572 writew(GLAMO_IRQ_MMC, host->pdata->core->base +
573 GLAMO_REG_IRQ_CLEAR);
574
575 /* yay we are an interrupt controller! -- call the ISR
576 * it will stop clock to card
577 */
578 glamo_mci_irq(IRQ_GLAMO(GLAMO_IRQIDX_MMC), host);
579
580 return 0;
581 }
582
583 static void glamo_mci_send_request(struct mmc_host *mmc, struct mmc_request *mrq)
584 {
585 struct glamo_mci_host *host = mmc_priv(mmc);
586 struct mmc_command *cmd = mrq->cmd;
587
588 glamo_mci_clock_enable(host);
589 host->request_counter++;
590 if (cmd->data) {
591 if(glamo_mci_prepare_pio(host, cmd->data)) {
592 cmd->error = -EIO;
593 cmd->data->error = -EIO;
594 goto done;
595 }
596 }
597
598 dev_dbg(&host->pdev->dev,"cmd 0x%x, "
599 "arg 0x%x data=%p mrq->stop=%p flags 0x%x\n",
600 cmd->opcode, cmd->arg, cmd->data, cmd->mrq->stop,
601 cmd->flags);
602
603 glamo_mci_send_command(host, cmd);
604
605 /*
606 * if we don't have bulk data to take care of, we're done
607 */
608 if (!cmd->data || cmd->error)
609 goto done;
610
611
612 if (!host->pdata->core->irq_works) {
613 if (glamo_mci_irq_poll(host, mrq->cmd))
614 goto done;
615 }
616
617 /*
618 * Otherwise can can use the interrupt as async completion --
619 * if there is read data coming, or we wait for write data to complete,
620 * exit without mmc_request_done() as the payload interrupt
621 * will service it
622 */
623 dev_dbg(&host->pdev->dev, "Waiting for payload data\n");
624 return;
625 done:
626 glamo_mci_request_done(host, mrq);
627 }
628
629 static void glamo_mci_set_power_mode(struct glamo_mci_host *host,
630 unsigned char power_mode) {
631 int ret;
632
633 if (power_mode == host->power_mode)
634 return;
635
636 switch(power_mode) {
637 case MMC_POWER_UP:
638 if (host->power_mode == MMC_POWER_OFF) {
639 ret = regulator_enable(host->regulator);
640 if (ret)
641 dev_err(&host->pdev->dev, "Failed to enable regulator: %d\n", ret);
642 }
643 break;
644 case MMC_POWER_ON:
645 break;
646 case MMC_POWER_OFF:
647 default:
648 glamo_engine_disable(host->pdata->core,
649 GLAMO_ENGINE_MMC);
650
651 ret = regulator_disable(host->regulator);
652 if (ret)
653 dev_warn(&host->pdev->dev, "Failed to disable regulator: %d\n", ret);
654 break;
655 }
656 host->power_mode = power_mode;
657 }
658
659 static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
660 {
661 struct glamo_mci_host *host = mmc_priv(mmc);
662 int bus_width = 0;
663 int rate;
664 int sd_drive;
665 int ret;
666
667 /* Set power */
668 glamo_mci_set_power_mode(host, ios->power_mode);
669
670 if (host->vdd != ios->vdd) {
671 ret = mmc_regulator_set_ocr(host->regulator, ios->vdd);
672 if (ret)
673 dev_err(&host->pdev->dev, "Failed to set regulator voltage: %d\n", ret);
674 else
675 host->vdd = ios->vdd;
676 }
677 rate = glamo_mci_set_card_clock(host, ios->clock);
678
679 if ((ios->power_mode == MMC_POWER_ON) ||
680 (ios->power_mode == MMC_POWER_UP)) {
681 dev_info(&host->pdev->dev,
682 "powered (vdd = %hu) clk: %dkHz div=%hu (req: %ukHz). "
683 "Bus width=%d\n", ios->vdd,
684 rate / 1000, 0,
685 ios->clock / 1000, (int)ios->bus_width);
686 } else {
687 dev_info(&host->pdev->dev, "glamo_mci_set_ios: power down.\n");
688 }
689
690 /* set bus width */
691 if (ios->bus_width == MMC_BUS_WIDTH_4)
692 bus_width = GLAMO_BASIC_MMC_EN_4BIT_DATA;
693
694 sd_drive = (rate * 4) / host->clk_rate;
695 if (sd_drive > 3)
696 sd_drive = 3;
697
698 glamo_reg_set_bit_mask(host, GLAMO_REG_MMC_BASIC,
699 GLAMO_BASIC_MMC_EN_4BIT_DATA | 0xb0,
700 bus_width | sd_drive << 6);
701 }
702
703
704 /*
705 * no physical write protect supported by us
706 */
707 static int glamo_mci_get_ro(struct mmc_host *mmc)
708 {
709 return 0;
710 }
711
712 static struct mmc_host_ops glamo_mci_ops = {
713 .request = glamo_mci_send_request,
714 .set_ios = glamo_mci_set_ios,
715 .get_ro = glamo_mci_get_ro,
716 };
717
718 static int glamo_mci_probe(struct platform_device *pdev)
719 {
720 struct mmc_host *mmc;
721 struct glamo_mci_host *host;
722 int ret;
723
724 dev_info(&pdev->dev, "glamo_mci driver (C)2007 Openmoko, Inc\n");
725
726 mmc = mmc_alloc_host(sizeof(struct glamo_mci_host), &pdev->dev);
727 if (!mmc) {
728 ret = -ENOMEM;
729 goto probe_out;
730 }
731
732 host = mmc_priv(mmc);
733 host->mmc = mmc;
734 host->pdev = pdev;
735 host->pdata = pdev->dev.platform_data;
736 host->power_mode = MMC_POWER_OFF;
737 host->clk_enabled = 0;
738
739 INIT_WORK(&host->irq_work, glamo_mci_irq_worker);
740 INIT_WORK(&host->read_work, glamo_mci_read_worker);
741
742 host->regulator = regulator_get(pdev->dev.parent, "SD_3V3");
743 if (!host->regulator) {
744 dev_err(&pdev->dev, "Cannot proceed without regulator.\n");
745 ret = -ENODEV;
746 goto probe_free_host;
747 }
748
749 host->mmio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
750 if (!host->mmio_mem) {
751 dev_err(&pdev->dev,
752 "failed to get io memory region resouce.\n");
753 ret = -ENOENT;
754 goto probe_regulator_put;
755 }
756
757 host->mmio_mem = request_mem_region(host->mmio_mem->start,
758 resource_size(host->mmio_mem),
759 pdev->name);
760
761 if (!host->mmio_mem) {
762 dev_err(&pdev->dev, "failed to request io memory region.\n");
763 ret = -ENOENT;
764 goto probe_regulator_put;
765 }
766
767 host->mmio_base = ioremap(host->mmio_mem->start,
768 resource_size(host->mmio_mem));
769 if (!host->mmio_base) {
770 dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
771 ret = -EINVAL;
772 goto probe_free_mem_region_mmio;
773 }
774
775
776 /* Get ahold of our data buffer we use for data in and out on MMC */
777 host->data_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
778 if (!host->data_mem) {
779 dev_err(&pdev->dev,
780 "failed to get io memory region resource.\n");
781 ret = -ENOENT;
782 goto probe_iounmap_mmio;
783 }
784
785 host->data_mem = request_mem_region(host->data_mem->start,
786 resource_size(host->data_mem),
787 pdev->name);
788
789 if (!host->data_mem) {
790 dev_err(&pdev->dev, "failed to request io memory region.\n");
791 ret = -ENOENT;
792 goto probe_iounmap_mmio;
793 }
794 host->data_base = ioremap(host->data_mem->start,
795 resource_size(host->data_mem));
796
797 if (host->data_base == 0) {
798 dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
799 ret = -EINVAL;
800 goto probe_free_mem_region_data;
801 }
802
803 ret = request_irq(IRQ_GLAMO(GLAMO_IRQIDX_MMC), glamo_mci_irq, IRQF_SHARED,
804 pdev->name, host);
805 if (ret) {
806 dev_err(&pdev->dev, "failed to register irq.\n");
807 goto probe_iounmap_data;
808 }
809
810
811 host->vdd = 0;
812 host->clk_rate = glamo_pll_rate(host->pdata->core, GLAMO_PLL1);
813
814 /* explain our host controller capabilities */
815 mmc->ops = &glamo_mci_ops;
816 mmc->ocr_avail = mmc_regulator_get_ocrmask(host->regulator);
817 mmc->caps = MMC_CAP_4_BIT_DATA |
818 MMC_CAP_MMC_HIGHSPEED |
819 MMC_CAP_SD_HIGHSPEED;
820 mmc->f_min = host->clk_rate / 256;
821 mmc->f_max = sd_max_clk;
822
823 mmc->max_blk_count = (1 << 16) - 1; /* GLAMO_REG_MMC_RB_BLKCNT */
824 mmc->max_blk_size = (1 << 12) - 1; /* GLAMO_REG_MMC_RB_BLKLEN */
825 mmc->max_req_size = resource_size(host->data_mem);
826 mmc->max_seg_size = mmc->max_req_size;
827 mmc->max_phys_segs = 128;
828 mmc->max_hw_segs = 128;
829
830 if (mmc->ocr_avail < 0) {
831 dev_warn(&pdev->dev, "Failed to get ocr list for regulator: %d.\n",
832 mmc->ocr_avail);
833 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
834 }
835
836 platform_set_drvdata(pdev, mmc);
837
838 glamo_engine_enable(host->pdata->core, GLAMO_ENGINE_MMC);
839 glamo_engine_reset(host->pdata->core, GLAMO_ENGINE_MMC);
840
841 glamo_reg_write(host, GLAMO_REG_MMC_WDATADS1,
842 (u16)(host->data_mem->start));
843 glamo_reg_write(host, GLAMO_REG_MMC_WDATADS2,
844 (u16)(host->data_mem->start >> 16));
845
846 glamo_reg_write(host, GLAMO_REG_MMC_RDATADS1,
847 (u16)(host->data_mem->start));
848 glamo_reg_write(host, GLAMO_REG_MMC_RDATADS2,
849 (u16)(host->data_mem->start >> 16));
850
851 setup_timer(&host->disable_timer, glamo_mci_disable_timer,
852 (unsigned long)host);
853
854 if ((ret = mmc_add_host(mmc))) {
855 dev_err(&pdev->dev, "failed to add mmc host.\n");
856 goto probe_freeirq;
857 }
858
859 dev_info(&pdev->dev,"initialisation done.\n");
860 return 0;
861
862 probe_freeirq:
863 free_irq(IRQ_GLAMO(GLAMO_IRQIDX_MMC), host);
864 probe_iounmap_data:
865 iounmap(host->data_base);
866 probe_free_mem_region_data:
867 release_mem_region(host->data_mem->start, resource_size(host->data_mem));
868 probe_iounmap_mmio:
869 iounmap(host->mmio_base);
870 probe_free_mem_region_mmio:
871 release_mem_region(host->mmio_mem->start, resource_size(host->mmio_mem));
872 probe_regulator_put:
873 regulator_put(host->regulator);
874 probe_free_host:
875 mmc_free_host(mmc);
876 probe_out:
877 return ret;
878 }
879
880 static int glamo_mci_remove(struct platform_device *pdev)
881 {
882 struct mmc_host *mmc = platform_get_drvdata(pdev);
883 struct glamo_mci_host *host = mmc_priv(mmc);
884
885 free_irq(IRQ_GLAMO(GLAMO_IRQIDX_MMC), host);
886
887 mmc_remove_host(mmc);
888 iounmap(host->mmio_base);
889 iounmap(host->data_base);
890 release_mem_region(host->mmio_mem->start, resource_size(host->mmio_mem));
891 release_mem_region(host->data_mem->start, resource_size(host->data_mem));
892
893 regulator_put(host->regulator);
894
895 mmc_free_host(mmc);
896
897 glamo_engine_disable(host->pdata->core, GLAMO_ENGINE_MMC);
898 return 0;
899 }
900
901
902 #ifdef CONFIG_PM
903
904 static int glamo_mci_suspend(struct device *dev)
905 {
906 struct mmc_host *mmc = dev_get_drvdata(dev);
907 struct glamo_mci_host *host = mmc_priv(mmc);
908 int ret;
909
910 cancel_work_sync(&host->irq_work);
911
912 ret = mmc_suspend_host(mmc, PMSG_SUSPEND);
913 glamo_mci_clock_enable(host);
914
915 return ret;
916 }
917
918 static int glamo_mci_resume(struct device *dev)
919 {
920 struct mmc_host *mmc = dev_get_drvdata(dev);
921 struct glamo_mci_host *host = mmc_priv(mmc);
922 int ret;
923
924 glamo_engine_enable(host->pdata->core, GLAMO_ENGINE_MMC);
925 glamo_engine_reset(host->pdata->core, GLAMO_ENGINE_MMC);
926
927 glamo_reg_write(host, GLAMO_REG_MMC_WDATADS1,
928 (u16)(host->data_mem->start));
929 glamo_reg_write(host, GLAMO_REG_MMC_WDATADS2,
930 (u16)(host->data_mem->start >> 16));
931
932 glamo_reg_write(host, GLAMO_REG_MMC_RDATADS1,
933 (u16)(host->data_mem->start));
934 glamo_reg_write(host, GLAMO_REG_MMC_RDATADS2,
935 (u16)(host->data_mem->start >> 16));
936 mdelay(5);
937
938 ret = mmc_resume_host(host->mmc);
939 /* glamo_mci_clock_disable(host);*/
940
941 return 0;
942 }
943
944 static struct dev_pm_ops glamo_mci_pm_ops = {
945 .suspend = glamo_mci_suspend,
946 .resume = glamo_mci_resume,
947 };
948 #define GLAMO_MCI_PM_OPS (&glamo_mci_pm_ops)
949
950 #else /* CONFIG_PM */
951 #define GLAMO_MCI_PM_OPS NULL
952 #endif /* CONFIG_PM */
953
954
955 static struct platform_driver glamo_mci_driver =
956 {
957 .probe = glamo_mci_probe,
958 .remove = glamo_mci_remove,
959 .driver = {
960 .name = "glamo-mci",
961 .owner = THIS_MODULE,
962 .pm = GLAMO_MCI_PM_OPS,
963 },
964 };
965
966 static int __init glamo_mci_init(void)
967 {
968 platform_driver_register(&glamo_mci_driver);
969 return 0;
970 }
971
972 static void __exit glamo_mci_exit(void)
973 {
974 platform_driver_unregister(&glamo_mci_driver);
975 }
976
977 module_init(glamo_mci_init);
978 module_exit(glamo_mci_exit);
979
980 MODULE_DESCRIPTION("Glamo MMC/SD Card Interface driver");
981 MODULE_LICENSE("GPL");
982 MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
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