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omap_hsmmc: card detect irq bugfix
[net-next-2.6.git] / drivers / mmc / host / omap_hsmmc.c
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a45c6cb8
MC		 1/*
2 * drivers/mmc/host/omap_hsmmc.c
3 *
4 * Driver for OMAP2430/3430 MMC controller.
5 *
6 * Copyright (C) 2007 Texas Instruments.
7 *
8 * Authors:
9 * Syed Mohammed Khasim <x0khasim@ti.com>
10 * Madhusudhan <madhu.cr@ti.com>
11 * Mohit Jalori <mjalori@ti.com>
12 *
13 * This file is licensed under the terms of the GNU General Public License
14 * version 2. This program is licensed "as is" without any warranty of any
15 * kind, whether express or implied.
16 */
17
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/interrupt.h>
21#include <linux/delay.h>
22#include <linux/dma-mapping.h>
23#include <linux/platform_device.h>
24#include <linux/workqueue.h>
25#include <linux/timer.h>
26#include <linux/clk.h>
27#include <linux/mmc/host.h>
28#include <linux/io.h>
29#include <linux/semaphore.h>
30#include <mach/dma.h>
31#include <mach/hardware.h>
32#include <mach/board.h>
33#include <mach/mmc.h>
34#include <mach/cpu.h>
35
36/* OMAP HSMMC Host Controller Registers */
37#define OMAP_HSMMC_SYSCONFIG 0x0010
38#define OMAP_HSMMC_CON 0x002C
39#define OMAP_HSMMC_BLK 0x0104
40#define OMAP_HSMMC_ARG 0x0108
41#define OMAP_HSMMC_CMD 0x010C
42#define OMAP_HSMMC_RSP10 0x0110
43#define OMAP_HSMMC_RSP32 0x0114
44#define OMAP_HSMMC_RSP54 0x0118
45#define OMAP_HSMMC_RSP76 0x011C
46#define OMAP_HSMMC_DATA 0x0120
47#define OMAP_HSMMC_HCTL 0x0128
48#define OMAP_HSMMC_SYSCTL 0x012C
49#define OMAP_HSMMC_STAT 0x0130
50#define OMAP_HSMMC_IE 0x0134
51#define OMAP_HSMMC_ISE 0x0138
52#define OMAP_HSMMC_CAPA 0x0140
53
54#define VS18 (1 << 26)
55#define VS30 (1 << 25)
56#define SDVS18 (0x5 << 9)
57#define SDVS30 (0x6 << 9)
58#define SDVSCLR 0xFFFFF1FF
59#define SDVSDET 0x00000400
60#define AUTOIDLE 0x1
61#define SDBP (1 << 8)
62#define DTO 0xe
63#define ICE 0x1
64#define ICS 0x2
65#define CEN (1 << 2)
66#define CLKD_MASK 0x0000FFC0
67#define CLKD_SHIFT 6
68#define DTO_MASK 0x000F0000
69#define DTO_SHIFT 16
70#define INT_EN_MASK 0x307F0033
71#define INIT_STREAM (1 << 1)
72#define DP_SELECT (1 << 21)
73#define DDIR (1 << 4)
74#define DMA_EN 0x1
75#define MSBS (1 << 5)
76#define BCE (1 << 1)
77#define FOUR_BIT (1 << 1)
78#define CC 0x1
79#define TC 0x02
80#define OD 0x1
81#define ERR (1 << 15)
82#define CMD_TIMEOUT (1 << 16)
83#define DATA_TIMEOUT (1 << 20)
84#define CMD_CRC (1 << 17)
85#define DATA_CRC (1 << 21)
86#define CARD_ERR (1 << 28)
87#define STAT_CLEAR 0xFFFFFFFF
88#define INIT_STREAM_CMD 0x00000000
89#define DUAL_VOLT_OCR_BIT 7
90#define SRC (1 << 25)
91#define SRD (1 << 26)
92
93/*
94 * FIXME: Most likely all the data using these _DEVID defines should come
95 * from the platform_data, or implemented in controller and slot specific
96 * functions.
97 */
98#define OMAP_MMC1_DEVID 0
99#define OMAP_MMC2_DEVID 1
100
101#define OMAP_MMC_DATADIR_NONE 0
102#define OMAP_MMC_DATADIR_READ 1
103#define OMAP_MMC_DATADIR_WRITE 2
104#define MMC_TIMEOUT_MS 20
105#define OMAP_MMC_MASTER_CLOCK 96000000
106#define DRIVER_NAME "mmci-omap-hs"
107
108/*
109 * One controller can have multiple slots, like on some omap boards using
110 * omap.c controller driver. Luckily this is not currently done on any known
111 * omap_hsmmc.c device.
112 */
113#define mmc_slot(host) (host->pdata->slots[host->slot_id])
114
115/*
116 * MMC Host controller read/write API's
117 */
118#define OMAP_HSMMC_READ(base, reg) \
119 __raw_readl((base) + OMAP_HSMMC_##reg)
120
121#define OMAP_HSMMC_WRITE(base, reg, val) \
122 __raw_writel((val), (base) + OMAP_HSMMC_##reg)
123
124struct mmc_omap_host {
125 struct device *dev;
126 struct mmc_host *mmc;
127 struct mmc_request *mrq;
128 struct mmc_command *cmd;
129 struct mmc_data *data;
130 struct clk *fclk;
131 struct clk *iclk;
132 struct clk *dbclk;
133 struct semaphore sem;
134 struct work_struct mmc_carddetect_work;
135 void __iomem *base;
136 resource_size_t mapbase;
137 unsigned int id;
138 unsigned int dma_len;
139 unsigned int dma_dir;
140 unsigned char bus_mode;
141 unsigned char datadir;
142 u32 *buffer;
143 u32 bytesleft;
144 int suspended;
145 int irq;
146 int carddetect;
147 int use_dma, dma_ch;
148 int initstr;
149 int slot_id;
150 int dbclk_enabled;
151 struct omap_mmc_platform_data *pdata;
152};
153
154/*
155 * Stop clock to the card
156 */
157static void omap_mmc_stop_clock(struct mmc_omap_host *host)
158{
159 OMAP_HSMMC_WRITE(host->base, SYSCTL,
160 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
161 if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
162 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n");
163}
164
165/*
166 * Send init stream sequence to card
167 * before sending IDLE command
168 */
169static void send_init_stream(struct mmc_omap_host *host)
170{
171 int reg = 0;
172 unsigned long timeout;
173
174 disable_irq(host->irq);
175 OMAP_HSMMC_WRITE(host->base, CON,
176 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
177 OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
178
179 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
180 while ((reg != CC) && time_before(jiffies, timeout))
181 reg = OMAP_HSMMC_READ(host->base, STAT) & CC;
182
183 OMAP_HSMMC_WRITE(host->base, CON,
184 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
185 enable_irq(host->irq);
186}
187
188static inline
189int mmc_omap_cover_is_closed(struct mmc_omap_host *host)
190{
191 int r = 1;
192
193 if (host->pdata->slots[host->slot_id].get_cover_state)
194 r = host->pdata->slots[host->slot_id].get_cover_state(host->dev,
195 host->slot_id);
196 return r;
197}
198
199static ssize_t
200mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr,
201 char *buf)
202{
203 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
204 struct mmc_omap_host *host = mmc_priv(mmc);
205
206 return sprintf(buf, "%s\n", mmc_omap_cover_is_closed(host) ? "closed" :
207 "open");
208}
209
210static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
211
212static ssize_t
213mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
214 char *buf)
215{
216 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
217 struct mmc_omap_host *host = mmc_priv(mmc);
218 struct omap_mmc_slot_data slot = host->pdata->slots[host->slot_id];
219
220 return sprintf(buf, "slot:%s\n", slot.name);
221}
222
223static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
224
225/*
226 * Configure the response type and send the cmd.
227 */
228static void
229mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd,
230 struct mmc_data *data)
231{
232 int cmdreg = 0, resptype = 0, cmdtype = 0;
233
234 dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
235 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
236 host->cmd = cmd;
237
238 /*
239 * Clear status bits and enable interrupts
240 */
241 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
242 OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
243 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
244
245 if (cmd->flags & MMC_RSP_PRESENT) {
246 if (cmd->flags & MMC_RSP_136)
247 resptype = 1;
248 else
249 resptype = 2;
250 }
251
252 /*
253 * Unlike OMAP1 controller, the cmdtype does not seem to be based on
254 * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
255 * a val of 0x3, rest 0x0.
256 */
257 if (cmd == host->mrq->stop)
258 cmdtype = 0x3;
259
260 cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
261
262 if (data) {
263 cmdreg |= DP_SELECT | MSBS | BCE;
264 if (data->flags & MMC_DATA_READ)
265 cmdreg |= DDIR;
266 else
267 cmdreg &= ~(DDIR);
268 }
269
270 if (host->use_dma)
271 cmdreg |= DMA_EN;
272
273 OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
274 OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
275}
276
277/*
278 * Notify the transfer complete to MMC core
279 */
280static void
281mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
282{
283 host->data = NULL;
284
285 if (host->use_dma && host->dma_ch != -1)
286 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
287 host->dma_dir);
288
289 host->datadir = OMAP_MMC_DATADIR_NONE;
290
291 if (!data->error)
292 data->bytes_xfered += data->blocks * (data->blksz);
293 else
294 data->bytes_xfered = 0;
295
296 if (!data->stop) {
297 host->mrq = NULL;
298 mmc_request_done(host->mmc, data->mrq);
299 return;
300 }
301 mmc_omap_start_command(host, data->stop, NULL);
302}
303
304/*
305 * Notify the core about command completion
306 */
307static void
308mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
309{
310 host->cmd = NULL;
311
312 if (cmd->flags & MMC_RSP_PRESENT) {
313 if (cmd->flags & MMC_RSP_136) {
314 /* response type 2 */
315 cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
316 cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
317 cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
318 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
319 } else {
320 /* response types 1, 1b, 3, 4, 5, 6 */
321 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
322 }
323 }
324 if (host->data == NULL || cmd->error) {
325 host->mrq = NULL;
326 mmc_request_done(host->mmc, cmd->mrq);
327 }
328}
329
330/*
331 * DMA clean up for command errors
332 */
333static void mmc_dma_cleanup(struct mmc_omap_host *host)
334{
335 host->data->error = -ETIMEDOUT;
336
337 if (host->use_dma && host->dma_ch != -1) {
338 dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len,
339 host->dma_dir);
340 omap_free_dma(host->dma_ch);
341 host->dma_ch = -1;
342 up(&host->sem);
343 }
344 host->data = NULL;
345 host->datadir = OMAP_MMC_DATADIR_NONE;
346}
347
348/*
349 * Readable error output
350 */
351#ifdef CONFIG_MMC_DEBUG
352static void mmc_omap_report_irq(struct mmc_omap_host *host, u32 status)
353{
354 /* --- means reserved bit without definition at documentation */
355 static const char *mmc_omap_status_bits[] = {
356 "CC", "TC", "BGE", "---", "BWR", "BRR", "---", "---", "CIRQ",
357 "OBI", "---", "---", "---", "---", "---", "ERRI", "CTO", "CCRC",
358 "CEB", "CIE", "DTO", "DCRC", "DEB", "---", "ACE", "---",
359 "---", "---", "---", "CERR", "CERR", "BADA", "---", "---", "---"
360 };
361 char res[256];
362 char *buf = res;
363 int len, i;
364
365 len = sprintf(buf, "MMC IRQ 0x%x :", status);
366 buf += len;
367
368 for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
369 if (status & (1 << i)) {
370 len = sprintf(buf, " %s", mmc_omap_status_bits[i]);
371 buf += len;
372 }
373
374 dev_dbg(mmc_dev(host->mmc), "%s\n", res);
375}
376#endif /* CONFIG_MMC_DEBUG */
377
378
379/*
380 * MMC controller IRQ handler
381 */
382static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
383{
384 struct mmc_omap_host *host = dev_id;
385 struct mmc_data *data;
386 int end_cmd = 0, end_trans = 0, status;
387
388 if (host->cmd == NULL && host->data == NULL) {
389 OMAP_HSMMC_WRITE(host->base, STAT,
390 OMAP_HSMMC_READ(host->base, STAT));
391 return IRQ_HANDLED;
392 }
393
394 data = host->data;
395 status = OMAP_HSMMC_READ(host->base, STAT);
396 dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
397
398 if (status & ERR) {
399#ifdef CONFIG_MMC_DEBUG
400 mmc_omap_report_irq(host, status);
401#endif
402 if ((status & CMD_TIMEOUT) ||
403 (status & CMD_CRC)) {
404 if (host->cmd) {
405 if (status & CMD_TIMEOUT) {
406 OMAP_HSMMC_WRITE(host->base, SYSCTL,
407 OMAP_HSMMC_READ(host->base,
408 SYSCTL) | SRC);
409 while (OMAP_HSMMC_READ(host->base,
410 SYSCTL) & SRC)
411 ;
412
413 host->cmd->error = -ETIMEDOUT;
414 } else {
415 host->cmd->error = -EILSEQ;
416 }
417 end_cmd = 1;
418 }
419 if (host->data)
420 mmc_dma_cleanup(host);
421 }
422 if ((status & DATA_TIMEOUT) ||
423 (status & DATA_CRC)) {
424 if (host->data) {
425 if (status & DATA_TIMEOUT)
426 mmc_dma_cleanup(host);
427 else
428 host->data->error = -EILSEQ;
429 OMAP_HSMMC_WRITE(host->base, SYSCTL,
430 OMAP_HSMMC_READ(host->base,
431 SYSCTL) | SRD);
432 while (OMAP_HSMMC_READ(host->base,
433 SYSCTL) & SRD)
434 ;
435 end_trans = 1;
436 }
437 }
438 if (status & CARD_ERR) {
439 dev_dbg(mmc_dev(host->mmc),
440 "Ignoring card err CMD%d\n", host->cmd->opcode);
441 if (host->cmd)
442 end_cmd = 1;
443 if (host->data)
444 end_trans = 1;
445 }
446 }
447
448 OMAP_HSMMC_WRITE(host->base, STAT, status);
449
450 if (end_cmd || (status & CC))
451 mmc_omap_cmd_done(host, host->cmd);
452 if (end_trans || (status & TC))
453 mmc_omap_xfer_done(host, data);
454
455 return IRQ_HANDLED;
456}
457
458/*
459 * Switch MMC operating voltage
460 */
461static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd)
462{
463 u32 reg_val = 0;
464 int ret;
465
466 /* Disable the clocks */
467 clk_disable(host->fclk);
468 clk_disable(host->iclk);
469 clk_disable(host->dbclk);
470
471 /* Turn the power off */
472 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
473 if (ret != 0)
474 goto err;
475
476 /* Turn the power ON with given VDD 1.8 or 3.0v */
477 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1, vdd);
478 if (ret != 0)
479 goto err;
480
481 clk_enable(host->fclk);
482 clk_enable(host->iclk);
483 clk_enable(host->dbclk);
484
485 OMAP_HSMMC_WRITE(host->base, HCTL,
486 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
487 reg_val = OMAP_HSMMC_READ(host->base, HCTL);
488 /*
489 * If a MMC dual voltage card is detected, the set_ios fn calls
490 * this fn with VDD bit set for 1.8V. Upon card removal from the
491 * slot, omap_mmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
492 *
493 * Only MMC1 supports 3.0V. MMC2 will not function if SDVS30 is
494 * set in HCTL.
495 */
496 if (host->id == OMAP_MMC1_DEVID && (((1 << vdd) == MMC_VDD_32_33) ||
497 ((1 << vdd) == MMC_VDD_33_34)))
498 reg_val |= SDVS30;
499 if ((1 << vdd) == MMC_VDD_165_195)
500 reg_val |= SDVS18;
501
502 OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
503
504 OMAP_HSMMC_WRITE(host->base, HCTL,
505 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
506
507 return 0;
508err:
509 dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
510 return ret;
511}
512
513/*
514 * Work Item to notify the core about card insertion/removal
515 */
516static void mmc_omap_detect(struct work_struct *work)
517{
518 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
519 mmc_carddetect_work);
249d0fa9
DB		 520 struct omap_mmc_slot_data *slot = &mmc_slot(host);
521
522 host->carddetect = slot->card_detect(slot->card_detect_irq);
a45c6cb8
MC		 523
524 sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
525 if (host->carddetect) {
526 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
527 } else {
528 OMAP_HSMMC_WRITE(host->base, SYSCTL,
529 OMAP_HSMMC_READ(host->base, SYSCTL) | SRD);
530 while (OMAP_HSMMC_READ(host->base, SYSCTL) & SRD)
531 ;
532
533 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
534 }
535}
536
537/*
538 * ISR for handling card insertion and removal
539 */
540static irqreturn_t omap_mmc_cd_handler(int irq, void *dev_id)
541{
542 struct mmc_omap_host *host = (struct mmc_omap_host *)dev_id;
543
a45c6cb8
MC		 544 schedule_work(&host->mmc_carddetect_work);
545
546 return IRQ_HANDLED;
547}
548
549/*
550 * DMA call back function
551 */
552static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
553{
554 struct mmc_omap_host *host = data;
555
556 if (ch_status & OMAP2_DMA_MISALIGNED_ERR_IRQ)
557 dev_dbg(mmc_dev(host->mmc), "MISALIGNED_ADRS_ERR\n");
558
559 if (host->dma_ch < 0)
560 return;
561
562 omap_free_dma(host->dma_ch);
563 host->dma_ch = -1;
564 /*
565 * DMA Callback: run in interrupt context.
566 * mutex_unlock will through a kernel warning if used.
567 */
568 up(&host->sem);
569}
570
571/*
572 * Configure dma src and destination parameters
573 */
574static int mmc_omap_config_dma_param(int sync_dir, struct mmc_omap_host *host,
575 struct mmc_data *data)
576{
577 if (sync_dir == 0) {
578 omap_set_dma_dest_params(host->dma_ch, 0,
579 OMAP_DMA_AMODE_CONSTANT,
580 (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
581 omap_set_dma_src_params(host->dma_ch, 0,
582 OMAP_DMA_AMODE_POST_INC,
583 sg_dma_address(&data->sg[0]), 0, 0);
584 } else {
585 omap_set_dma_src_params(host->dma_ch, 0,
586 OMAP_DMA_AMODE_CONSTANT,
587 (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
588 omap_set_dma_dest_params(host->dma_ch, 0,
589 OMAP_DMA_AMODE_POST_INC,
590 sg_dma_address(&data->sg[0]), 0, 0);
591 }
592 return 0;
593}
594/*
595 * Routine to configure and start DMA for the MMC card
596 */
597static int
598mmc_omap_start_dma_transfer(struct mmc_omap_host *host, struct mmc_request *req)
599{
600 int sync_dev, sync_dir = 0;
601 int dma_ch = 0, ret = 0, err = 1;
602 struct mmc_data *data = req->data;
603
604 /*
605 * If for some reason the DMA transfer is still active,
606 * we wait for timeout period and free the dma
607 */
608 if (host->dma_ch != -1) {
609 set_current_state(TASK_UNINTERRUPTIBLE);
610 schedule_timeout(100);
611 if (down_trylock(&host->sem)) {
612 omap_free_dma(host->dma_ch);
613 host->dma_ch = -1;
614 up(&host->sem);
615 return err;
616 }
617 } else {
618 if (down_trylock(&host->sem))
619 return err;
620 }
621
622 if (!(data->flags & MMC_DATA_WRITE)) {
623 host->dma_dir = DMA_FROM_DEVICE;
624 if (host->id == OMAP_MMC1_DEVID)
625 sync_dev = OMAP24XX_DMA_MMC1_RX;
626 else
627 sync_dev = OMAP24XX_DMA_MMC2_RX;
628 } else {
629 host->dma_dir = DMA_TO_DEVICE;
630 if (host->id == OMAP_MMC1_DEVID)
631 sync_dev = OMAP24XX_DMA_MMC1_TX;
632 else
633 sync_dev = OMAP24XX_DMA_MMC2_TX;
634 }
635
636 ret = omap_request_dma(sync_dev, "MMC/SD", mmc_omap_dma_cb,
637 host, &dma_ch);
638 if (ret != 0) {
639 dev_dbg(mmc_dev(host->mmc),
640 "%s: omap_request_dma() failed with %d\n",
641 mmc_hostname(host->mmc), ret);
642 return ret;
643 }
644
645 host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
646 data->sg_len, host->dma_dir);
647 host->dma_ch = dma_ch;
648
649 if (!(data->flags & MMC_DATA_WRITE))
650 mmc_omap_config_dma_param(1, host, data);
651 else
652 mmc_omap_config_dma_param(0, host, data);
653
654 if ((data->blksz % 4) == 0)
655 omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
656 (data->blksz / 4), data->blocks, OMAP_DMA_SYNC_FRAME,
657 sync_dev, sync_dir);
658 else
659 /* REVISIT: The MMC buffer increments only when MSB is written.
660 * Return error for blksz which is non multiple of four.
661 */
662 return -EINVAL;
663
664 omap_start_dma(dma_ch);
665 return 0;
666}
667
668static void set_data_timeout(struct mmc_omap_host *host,
669 struct mmc_request *req)
670{
671 unsigned int timeout, cycle_ns;
672 uint32_t reg, clkd, dto = 0;
673
674 reg = OMAP_HSMMC_READ(host->base, SYSCTL);
675 clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
676 if (clkd == 0)
677 clkd = 1;
678
679 cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
680 timeout = req->data->timeout_ns / cycle_ns;
681 timeout += req->data->timeout_clks;
682 if (timeout) {
683 while ((timeout & 0x80000000) == 0) {
684 dto += 1;
685 timeout <<= 1;
686 }
687 dto = 31 - dto;
688 timeout <<= 1;
689 if (timeout && dto)
690 dto += 1;
691 if (dto >= 13)
692 dto -= 13;
693 else
694 dto = 0;
695 if (dto > 14)
696 dto = 14;
697 }
698
699 reg &= ~DTO_MASK;
700 reg |= dto << DTO_SHIFT;
701 OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
702}
703
704/*
705 * Configure block length for MMC/SD cards and initiate the transfer.
706 */
707static int
708mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
709{
710 int ret;
711 host->data = req->data;
712
713 if (req->data == NULL) {
714 host->datadir = OMAP_MMC_DATADIR_NONE;
715 OMAP_HSMMC_WRITE(host->base, BLK, 0);
716 return 0;
717 }
718
719 OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
720 | (req->data->blocks << 16));
721 set_data_timeout(host, req);
722
723 host->datadir = (req->data->flags & MMC_DATA_WRITE) ?
724 OMAP_MMC_DATADIR_WRITE : OMAP_MMC_DATADIR_READ;
725
726 if (host->use_dma) {
727 ret = mmc_omap_start_dma_transfer(host, req);
728 if (ret != 0) {
729 dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
730 return ret;
731 }
732 }
733 return 0;
734}
735
736/*
737 * Request function. for read/write operation
738 */
739static void omap_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
740{
741 struct mmc_omap_host *host = mmc_priv(mmc);
742
743 WARN_ON(host->mrq != NULL);
744 host->mrq = req;
745 mmc_omap_prepare_data(host, req);
746 mmc_omap_start_command(host, req->cmd, req->data);
747}
748
749
750/* Routine to configure clock values. Exposed API to core */
751static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
752{
753 struct mmc_omap_host *host = mmc_priv(mmc);
754 u16 dsor = 0;
755 unsigned long regval;
756 unsigned long timeout;
757
758 switch (ios->power_mode) {
759 case MMC_POWER_OFF:
760 mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
761 /*
762 * Reset bus voltage to 3V if it got set to 1.8V earlier.
763 * REVISIT: If we are able to detect cards after unplugging
764 * a 1.8V card, this code should not be needed.
765 */
766 if (!(OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET)) {
767 int vdd = fls(host->mmc->ocr_avail) - 1;
768 if (omap_mmc_switch_opcond(host, vdd) != 0)
769 host->mmc->ios.vdd = vdd;
770 }
771 break;
772 case MMC_POWER_UP:
773 mmc_slot(host).set_power(host->dev, host->slot_id, 1, ios->vdd);
774 break;
775 }
776
777 switch (mmc->ios.bus_width) {
778 case MMC_BUS_WIDTH_4:
779 OMAP_HSMMC_WRITE(host->base, HCTL,
780 OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
781 break;
782 case MMC_BUS_WIDTH_1:
783 OMAP_HSMMC_WRITE(host->base, HCTL,
784 OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
785 break;
786 }
787
788 if (host->id == OMAP_MMC1_DEVID) {
789 /* Only MMC1 can operate at 3V/1.8V */
790 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
791 (ios->vdd == DUAL_VOLT_OCR_BIT)) {
792 /*
793 * The mmc_select_voltage fn of the core does
794 * not seem to set the power_mode to
795 * MMC_POWER_UP upon recalculating the voltage.
796 * vdd 1.8v.
797 */
798 if (omap_mmc_switch_opcond(host, ios->vdd) != 0)
799 dev_dbg(mmc_dev(host->mmc),
800 "Switch operation failed\n");
801 }
802 }
803
804 if (ios->clock) {
805 dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
806 if (dsor < 1)
807 dsor = 1;
808
809 if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
810 dsor++;
811
812 if (dsor > 250)
813 dsor = 250;
814 }
815 omap_mmc_stop_clock(host);
816 regval = OMAP_HSMMC_READ(host->base, SYSCTL);
817 regval = regval & ~(CLKD_MASK);
818 regval = regval | (dsor << 6) | (DTO << 16);
819 OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
820 OMAP_HSMMC_WRITE(host->base, SYSCTL,
821 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
822
823 /* Wait till the ICS bit is set */
824 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
825 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != 0x2
826 && time_before(jiffies, timeout))
827 msleep(1);
828
829 OMAP_HSMMC_WRITE(host->base, SYSCTL,
830 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
831
832 if (ios->power_mode == MMC_POWER_ON)
833 send_init_stream(host);
834
835 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
836 OMAP_HSMMC_WRITE(host->base, CON,
837 OMAP_HSMMC_READ(host->base, CON) | OD);
838}
839
840static int omap_hsmmc_get_cd(struct mmc_host *mmc)
841{
842 struct mmc_omap_host *host = mmc_priv(mmc);
843 struct omap_mmc_platform_data *pdata = host->pdata;
844
845 if (!pdata->slots[0].card_detect)
846 return -ENOSYS;
847 return pdata->slots[0].card_detect(pdata->slots[0].card_detect_irq);
848}
849
850static int omap_hsmmc_get_ro(struct mmc_host *mmc)
851{
852 struct mmc_omap_host *host = mmc_priv(mmc);
853 struct omap_mmc_platform_data *pdata = host->pdata;
854
855 if (!pdata->slots[0].get_ro)
856 return -ENOSYS;
857 return pdata->slots[0].get_ro(host->dev, 0);
858}
859
860static struct mmc_host_ops mmc_omap_ops = {
861 .request = omap_mmc_request,
862 .set_ios = omap_mmc_set_ios,
863 .get_cd = omap_hsmmc_get_cd,
864 .get_ro = omap_hsmmc_get_ro,
865 /* NYET -- enable_sdio_irq */
866};
867
868static int __init omap_mmc_probe(struct platform_device *pdev)
869{
870 struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
871 struct mmc_host *mmc;
872 struct mmc_omap_host *host = NULL;
873 struct resource *res;
874 int ret = 0, irq;
875 u32 hctl, capa;
876
877 if (pdata == NULL) {
878 dev_err(&pdev->dev, "Platform Data is missing\n");
879 return -ENXIO;
880 }
881
882 if (pdata->nr_slots == 0) {
883 dev_err(&pdev->dev, "No Slots\n");
884 return -ENXIO;
885 }
886
887 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
888 irq = platform_get_irq(pdev, 0);
889 if (res == NULL || irq < 0)
890 return -ENXIO;
891
892 res = request_mem_region(res->start, res->end - res->start + 1,
893 pdev->name);
894 if (res == NULL)
895 return -EBUSY;
896
897 mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
898 if (!mmc) {
899 ret = -ENOMEM;
900 goto err;
901 }
902
903 host = mmc_priv(mmc);
904 host->mmc = mmc;
905 host->pdata = pdata;
906 host->dev = &pdev->dev;
907 host->use_dma = 1;
908 host->dev->dma_mask = &pdata->dma_mask;
909 host->dma_ch = -1;
910 host->irq = irq;
911 host->id = pdev->id;
912 host->slot_id = 0;
913 host->mapbase = res->start;
914 host->base = ioremap(host->mapbase, SZ_4K);
915
916 platform_set_drvdata(pdev, host);
917 INIT_WORK(&host->mmc_carddetect_work, mmc_omap_detect);
918
919 mmc->ops = &mmc_omap_ops;
920 mmc->f_min = 400000;
921 mmc->f_max = 52000000;
922
923 sema_init(&host->sem, 1);
924
925 host->iclk = clk_get(&pdev->dev, "mmchs_ick");
926 if (IS_ERR(host->iclk)) {
927 ret = PTR_ERR(host->iclk);
928 host->iclk = NULL;
929 goto err1;
930 }
931 host->fclk = clk_get(&pdev->dev, "mmchs_fck");
932 if (IS_ERR(host->fclk)) {
933 ret = PTR_ERR(host->fclk);
934 host->fclk = NULL;
935 clk_put(host->iclk);
936 goto err1;
937 }
938
939 if (clk_enable(host->fclk) != 0) {
940 clk_put(host->iclk);
941 clk_put(host->fclk);
942 goto err1;
943 }
944
945 if (clk_enable(host->iclk) != 0) {
946 clk_disable(host->fclk);
947 clk_put(host->iclk);
948 clk_put(host->fclk);
949 goto err1;
950 }
951
952 host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
953 /*
954 * MMC can still work without debounce clock.
955 */
956 if (IS_ERR(host->dbclk))
957 dev_warn(mmc_dev(host->mmc), "Failed to get debounce clock\n");
958 else
959 if (clk_enable(host->dbclk) != 0)
960 dev_dbg(mmc_dev(host->mmc), "Enabling debounce"
961 " clk failed\n");
962 else
963 host->dbclk_enabled = 1;
964
965#ifdef CONFIG_MMC_BLOCK_BOUNCE
966 mmc->max_phys_segs = 1;
967 mmc->max_hw_segs = 1;
968#endif
969 mmc->max_blk_size = 512; /* Block Length at max can be 1024 */
970 mmc->max_blk_count = 0xFFFF; /* No. of Blocks is 16 bits */
971 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
972 mmc->max_seg_size = mmc->max_req_size;
973
974 mmc->ocr_avail = mmc_slot(host).ocr_mask;
975 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED;
976
977 if (pdata->slots[host->slot_id].wires >= 4)
978 mmc->caps |= MMC_CAP_4_BIT_DATA;
979
980 /* Only MMC1 supports 3.0V */
981 if (host->id == OMAP_MMC1_DEVID) {
982 hctl = SDVS30;
983 capa = VS30 | VS18;
984 } else {
985 hctl = SDVS18;
986 capa = VS18;
987 }
988
989 OMAP_HSMMC_WRITE(host->base, HCTL,
990 OMAP_HSMMC_READ(host->base, HCTL) | hctl);
991
992 OMAP_HSMMC_WRITE(host->base, CAPA,
993 OMAP_HSMMC_READ(host->base, CAPA) | capa);
994
995 /* Set the controller to AUTO IDLE mode */
996 OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
997 OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
998
999 /* Set SD bus power bit */
1000 OMAP_HSMMC_WRITE(host->base, HCTL,
1001 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1002
1003 /* Request IRQ for MMC operations */
1004 ret = request_irq(host->irq, mmc_omap_irq, IRQF_DISABLED,
1005 mmc_hostname(mmc), host);
1006 if (ret) {
1007 dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
1008 goto err_irq;
1009 }
1010
1011 if (pdata->init != NULL) {
1012 if (pdata->init(&pdev->dev) != 0) {
1013 dev_dbg(mmc_dev(host->mmc),
1014 "Unable to configure MMC IRQs\n");
1015 goto err_irq_cd_init;
1016 }
1017 }
1018
1019 /* Request IRQ for card detect */
1020 if ((mmc_slot(host).card_detect_irq) && (mmc_slot(host).card_detect)) {
1021 ret = request_irq(mmc_slot(host).card_detect_irq,
1022 omap_mmc_cd_handler,
1023 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
1024 | IRQF_DISABLED,
1025 mmc_hostname(mmc), host);
1026 if (ret) {
1027 dev_dbg(mmc_dev(host->mmc),
1028 "Unable to grab MMC CD IRQ\n");
1029 goto err_irq_cd;
1030 }
1031 }
1032
1033 OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
1034 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
1035
1036 mmc_add_host(mmc);
1037
1038 if (host->pdata->slots[host->slot_id].name != NULL) {
1039 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
1040 if (ret < 0)
1041 goto err_slot_name;
1042 }
1043 if (mmc_slot(host).card_detect_irq && mmc_slot(host).card_detect &&
1044 host->pdata->slots[host->slot_id].get_cover_state) {
1045 ret = device_create_file(&mmc->class_dev,
1046 &dev_attr_cover_switch);
1047 if (ret < 0)
1048 goto err_cover_switch;
1049 }
1050
1051 return 0;
1052
1053err_cover_switch:
1054 device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
1055err_slot_name:
1056 mmc_remove_host(mmc);
1057err_irq_cd:
1058 free_irq(mmc_slot(host).card_detect_irq, host);
1059err_irq_cd_init:
1060 free_irq(host->irq, host);
1061err_irq:
1062 clk_disable(host->fclk);
1063 clk_disable(host->iclk);
1064 clk_put(host->fclk);
1065 clk_put(host->iclk);
1066 if (host->dbclk_enabled) {
1067 clk_disable(host->dbclk);
1068 clk_put(host->dbclk);
1069 }
1070
1071err1:
1072 iounmap(host->base);
1073err:
1074 dev_dbg(mmc_dev(host->mmc), "Probe Failed\n");
1075 release_mem_region(res->start, res->end - res->start + 1);
1076 if (host)
1077 mmc_free_host(mmc);
1078 return ret;
1079}
1080
1081static int omap_mmc_remove(struct platform_device *pdev)
1082{
1083 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1084 struct resource *res;
1085
1086 if (host) {
1087 mmc_remove_host(host->mmc);
1088 if (host->pdata->cleanup)
1089 host->pdata->cleanup(&pdev->dev);
1090 free_irq(host->irq, host);
1091 if (mmc_slot(host).card_detect_irq)
1092 free_irq(mmc_slot(host).card_detect_irq, host);
1093 flush_scheduled_work();
1094
1095 clk_disable(host->fclk);
1096 clk_disable(host->iclk);
1097 clk_put(host->fclk);
1098 clk_put(host->iclk);
1099 if (host->dbclk_enabled) {
1100 clk_disable(host->dbclk);
1101 clk_put(host->dbclk);
1102 }
1103
1104 mmc_free_host(host->mmc);
1105 iounmap(host->base);
1106 }
1107
1108 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1109 if (res)
1110 release_mem_region(res->start, res->end - res->start + 1);
1111 platform_set_drvdata(pdev, NULL);
1112
1113 return 0;
1114}
1115
1116#ifdef CONFIG_PM
1117static int omap_mmc_suspend(struct platform_device *pdev, pm_message_t state)
1118{
1119 int ret = 0;
1120 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1121
1122 if (host && host->suspended)
1123 return 0;
1124
1125 if (host) {
1126 ret = mmc_suspend_host(host->mmc, state);
1127 if (ret == 0) {
1128 host->suspended = 1;
1129
1130 OMAP_HSMMC_WRITE(host->base, ISE, 0);
1131 OMAP_HSMMC_WRITE(host->base, IE, 0);
1132
1133 if (host->pdata->suspend) {
1134 ret = host->pdata->suspend(&pdev->dev,
1135 host->slot_id);
1136 if (ret)
1137 dev_dbg(mmc_dev(host->mmc),
1138 "Unable to handle MMC board"
1139 " level suspend\n");
1140 }
1141
1142 if (!(OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET)) {
1143 OMAP_HSMMC_WRITE(host->base, HCTL,
1144 OMAP_HSMMC_READ(host->base, HCTL)
1145 & SDVSCLR);
1146 OMAP_HSMMC_WRITE(host->base, HCTL,
1147 OMAP_HSMMC_READ(host->base, HCTL)
1148 | SDVS30);
1149 OMAP_HSMMC_WRITE(host->base, HCTL,
1150 OMAP_HSMMC_READ(host->base, HCTL)
1151 | SDBP);
1152 }
1153
1154 clk_disable(host->fclk);
1155 clk_disable(host->iclk);
1156 clk_disable(host->dbclk);
1157 }
1158
1159 }
1160 return ret;
1161}
1162
1163/* Routine to resume the MMC device */
1164static int omap_mmc_resume(struct platform_device *pdev)
1165{
1166 int ret = 0;
1167 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1168
1169 if (host && !host->suspended)
1170 return 0;
1171
1172 if (host) {
1173
1174 ret = clk_enable(host->fclk);
1175 if (ret)
1176 goto clk_en_err;
1177
1178 ret = clk_enable(host->iclk);
1179 if (ret) {
1180 clk_disable(host->fclk);
1181 clk_put(host->fclk);
1182 goto clk_en_err;
1183 }
1184
1185 if (clk_enable(host->dbclk) != 0)
1186 dev_dbg(mmc_dev(host->mmc),
1187 "Enabling debounce clk failed\n");
1188
1189 if (host->pdata->resume) {
1190 ret = host->pdata->resume(&pdev->dev, host->slot_id);
1191 if (ret)
1192 dev_dbg(mmc_dev(host->mmc),
1193 "Unmask interrupt failed\n");
1194 }
1195
1196 /* Notify the core to resume the host */
1197 ret = mmc_resume_host(host->mmc);
1198 if (ret == 0)
1199 host->suspended = 0;
1200 }
1201
1202 return ret;
1203
1204clk_en_err:
1205 dev_dbg(mmc_dev(host->mmc),
1206 "Failed to enable MMC clocks during resume\n");
1207 return ret;
1208}
1209
1210#else
1211#define omap_mmc_suspend NULL
1212#define omap_mmc_resume NULL
1213#endif
1214
1215static struct platform_driver omap_mmc_driver = {
1216 .probe = omap_mmc_probe,
1217 .remove = omap_mmc_remove,
1218 .suspend = omap_mmc_suspend,
1219 .resume = omap_mmc_resume,
1220 .driver = {
1221 .name = DRIVER_NAME,
1222 .owner = THIS_MODULE,
1223 },
1224};
1225
1226static int __init omap_mmc_init(void)
1227{
1228 /* Register the MMC driver */
1229 return platform_driver_register(&omap_mmc_driver);
1230}
1231
1232static void __exit omap_mmc_cleanup(void)
1233{
1234 /* Unregister MMC driver */
1235 platform_driver_unregister(&omap_mmc_driver);
1236}
1237
1238module_init(omap_mmc_init);
1239module_exit(omap_mmc_cleanup);
1240
1241MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
1242MODULE_LICENSE("GPL");
1243MODULE_ALIAS("platform:" DRIVER_NAME);
1244MODULE_AUTHOR("Texas Instruments Inc");
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