1 /*
2 * linux/drivers/mmc/host/msm_sdcc.c - Qualcomm MSM 7X00A SDCC Driver
3 *
4 * Copyright (C) 2007 Google Inc,
5 * Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
6 * Copyright (C) 2009, Code Aurora Forum. All Rights Reserved.
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 * Based on mmci.c
13 *
14 * Author: San Mehat (san@android.com)
15 *
16 */
17
18 #include <linux/module.h>
19 #include <linux/moduleparam.h>
20 #include <linux/init.h>
21 #include <linux/ioport.h>
22 #include <linux/device.h>
23 #include <linux/interrupt.h>
24 #include <linux/delay.h>
25 #include <linux/err.h>
26 #include <linux/highmem.h>
27 #include <linux/log2.h>
28 #include <linux/mmc/host.h>
29 #include <linux/mmc/card.h>
30 #include <linux/mmc/sdio.h>
31 #include <linux/clk.h>
32 #include <linux/scatterlist.h>
33 #include <linux/platform_device.h>
34 #include <linux/dma-mapping.h>
35 #include <linux/debugfs.h>
36 #include <linux/io.h>
37 #include <linux/memory.h>
38 #include <linux/gfp.h>
39 #include <linux/gpio.h>
40
41 #include <asm/cacheflush.h>
42 #include <asm/div64.h>
43 #include <asm/sizes.h>
44
45 #include <linux/platform_data/mmc-msm_sdcc.h>
46 #include <mach/dma.h>
47 #include <mach/clk.h>
48
49 #include "msm_sdcc.h"
50
51 #define DRIVER_NAME "msm-sdcc"
52
53 #define BUSCLK_PWRSAVE 1
54 #define BUSCLK_TIMEOUT (HZ)
55 static unsigned int msmsdcc_fmin = 144000;
56 static unsigned int msmsdcc_fmax = 50000000;
57 static unsigned int msmsdcc_4bit = 1;
58 static unsigned int msmsdcc_pwrsave = 1;
59 static unsigned int msmsdcc_piopoll = 1;
60 static unsigned int msmsdcc_sdioirq;
61
62 #define PIO_SPINMAX 30
63 #define CMD_SPINMAX 20
64
65
66 static inline void
msmsdcc_disable_clocks(struct msmsdcc_host * host,int deferr)67 msmsdcc_disable_clocks(struct msmsdcc_host *host, int deferr)
68 {
69 WARN_ON(!host->clks_on);
70
71 BUG_ON(host->curr.mrq);
72
73 if (deferr) {
74 mod_timer(&host->busclk_timer, jiffies + BUSCLK_TIMEOUT);
75 } else {
76 del_timer_sync(&host->busclk_timer);
77 /* Need to check clks_on again in case the busclk
78 * timer fired
79 */
80 if (host->clks_on) {
81 clk_disable(host->clk);
82 clk_disable(host->pclk);
83 host->clks_on = 0;
84 }
85 }
86 }
87
88 static inline int
msmsdcc_enable_clocks(struct msmsdcc_host * host)89 msmsdcc_enable_clocks(struct msmsdcc_host *host)
90 {
91 int rc;
92
93 del_timer_sync(&host->busclk_timer);
94
95 if (!host->clks_on) {
96 rc = clk_enable(host->pclk);
97 if (rc)
98 return rc;
99 rc = clk_enable(host->clk);
100 if (rc) {
101 clk_disable(host->pclk);
102 return rc;
103 }
104 udelay(1 + ((3 * USEC_PER_SEC) /
105 (host->clk_rate ? host->clk_rate : msmsdcc_fmin)));
106 host->clks_on = 1;
107 }
108 return 0;
109 }
110
111 static inline unsigned int
msmsdcc_readl(struct msmsdcc_host * host,unsigned int reg)112 msmsdcc_readl(struct msmsdcc_host *host, unsigned int reg)
113 {
114 return readl(host->base + reg);
115 }
116
117 static inline void
msmsdcc_writel(struct msmsdcc_host * host,u32 data,unsigned int reg)118 msmsdcc_writel(struct msmsdcc_host *host, u32 data, unsigned int reg)
119 {
120 writel(data, host->base + reg);
121 /* 3 clk delay required! */
122 udelay(1 + ((3 * USEC_PER_SEC) /
123 (host->clk_rate ? host->clk_rate : msmsdcc_fmin)));
124 }
125
126 static void
127 msmsdcc_start_command(struct msmsdcc_host *host, struct mmc_command *cmd,
128 u32 c);
129
msmsdcc_reset_and_restore(struct msmsdcc_host * host)130 static void msmsdcc_reset_and_restore(struct msmsdcc_host *host)
131 {
132 u32 mci_clk = 0;
133 u32 mci_mask0 = 0;
134 int ret = 0;
135
136 /* Save the controller state */
137 mci_clk = readl(host->base + MMCICLOCK);
138 mci_mask0 = readl(host->base + MMCIMASK0);
139
140 /* Reset the controller */
141 ret = clk_reset(host->clk, CLK_RESET_ASSERT);
142 if (ret)
143 pr_err("%s: Clock assert failed at %u Hz with err %d\n",
144 mmc_hostname(host->mmc), host->clk_rate, ret);
145
146 ret = clk_reset(host->clk, CLK_RESET_DEASSERT);
147 if (ret)
148 pr_err("%s: Clock deassert failed at %u Hz with err %d\n",
149 mmc_hostname(host->mmc), host->clk_rate, ret);
150
151 pr_info("%s: Controller has been re-initialiazed\n",
152 mmc_hostname(host->mmc));
153
154 /* Restore the contoller state */
155 writel(host->pwr, host->base + MMCIPOWER);
156 writel(mci_clk, host->base + MMCICLOCK);
157 writel(mci_mask0, host->base + MMCIMASK0);
158 ret = clk_set_rate(host->clk, host->clk_rate);
159 if (ret)
160 pr_err("%s: Failed to set clk rate %u Hz (%d)\n",
161 mmc_hostname(host->mmc), host->clk_rate, ret);
162 }
163
164 static void
msmsdcc_request_end(struct msmsdcc_host * host,struct mmc_request * mrq)165 msmsdcc_request_end(struct msmsdcc_host *host, struct mmc_request *mrq)
166 {
167 BUG_ON(host->curr.data);
168
169 host->curr.mrq = NULL;
170 host->curr.cmd = NULL;
171
172 if (mrq->data)
173 mrq->data->bytes_xfered = host->curr.data_xfered;
174 if (mrq->cmd->error == -ETIMEDOUT)
175 mdelay(5);
176
177 #if BUSCLK_PWRSAVE
178 msmsdcc_disable_clocks(host, 1);
179 #endif
180 /*
181 * Need to drop the host lock here; mmc_request_done may call
182 * back into the driver...
183 */
184 spin_unlock(&host->lock);
185 mmc_request_done(host->mmc, mrq);
186 spin_lock(&host->lock);
187 }
188
189 static void
msmsdcc_stop_data(struct msmsdcc_host * host)190 msmsdcc_stop_data(struct msmsdcc_host *host)
191 {
192 host->curr.data = NULL;
193 host->curr.got_dataend = 0;
194 }
195
msmsdcc_fifo_addr(struct msmsdcc_host * host)196 uint32_t msmsdcc_fifo_addr(struct msmsdcc_host *host)
197 {
198 return host->memres->start + MMCIFIFO;
199 }
200
201 static inline void
msmsdcc_start_command_exec(struct msmsdcc_host * host,u32 arg,u32 c)202 msmsdcc_start_command_exec(struct msmsdcc_host *host, u32 arg, u32 c) {
203 msmsdcc_writel(host, arg, MMCIARGUMENT);
204 msmsdcc_writel(host, c, MMCICOMMAND);
205 }
206
207 static void
msmsdcc_dma_exec_func(struct msm_dmov_cmd * cmd)208 msmsdcc_dma_exec_func(struct msm_dmov_cmd *cmd)
209 {
210 struct msmsdcc_host *host = (struct msmsdcc_host *)cmd->data;
211
212 msmsdcc_writel(host, host->cmd_timeout, MMCIDATATIMER);
213 msmsdcc_writel(host, (unsigned int)host->curr.xfer_size,
214 MMCIDATALENGTH);
215 msmsdcc_writel(host, (msmsdcc_readl(host, MMCIMASK0) &
216 (~MCI_IRQ_PIO)) | host->cmd_pio_irqmask, MMCIMASK0);
217 msmsdcc_writel(host, host->cmd_datactrl, MMCIDATACTRL);
218
219 if (host->cmd_cmd) {
220 msmsdcc_start_command_exec(host,
221 (u32) host->cmd_cmd->arg,
222 (u32) host->cmd_c);
223 }
224 host->dma.active = 1;
225 }
226
227 static void
msmsdcc_dma_complete_tlet(unsigned long data)228 msmsdcc_dma_complete_tlet(unsigned long data)
229 {
230 struct msmsdcc_host *host = (struct msmsdcc_host *)data;
231 unsigned long flags;
232 struct mmc_request *mrq;
233 struct msm_dmov_errdata err;
234
235 spin_lock_irqsave(&host->lock, flags);
236 host->dma.active = 0;
237
238 err = host->dma.err;
239 mrq = host->curr.mrq;
240 BUG_ON(!mrq);
241 WARN_ON(!mrq->data);
242
243 if (!(host->dma.result & DMOV_RSLT_VALID)) {
244 pr_err("msmsdcc: Invalid DataMover result\n");
245 goto out;
246 }
247
248 if (host->dma.result & DMOV_RSLT_DONE) {
249 host->curr.data_xfered = host->curr.xfer_size;
250 } else {
251 /* Error or flush */
252 if (host->dma.result & DMOV_RSLT_ERROR)
253 pr_err("%s: DMA error (0x%.8x)\n",
254 mmc_hostname(host->mmc), host->dma.result);
255 if (host->dma.result & DMOV_RSLT_FLUSH)
256 pr_err("%s: DMA channel flushed (0x%.8x)\n",
257 mmc_hostname(host->mmc), host->dma.result);
258
259 pr_err("Flush data: %.8x %.8x %.8x %.8x %.8x %.8x\n",
260 err.flush[0], err.flush[1], err.flush[2],
261 err.flush[3], err.flush[4], err.flush[5]);
262
263 msmsdcc_reset_and_restore(host);
264 if (!mrq->data->error)
265 mrq->data->error = -EIO;
266 }
267 dma_unmap_sg(mmc_dev(host->mmc), host->dma.sg, host->dma.num_ents,
268 host->dma.dir);
269
270 host->dma.sg = NULL;
271 host->dma.busy = 0;
272
273 if (host->curr.got_dataend || mrq->data->error) {
274
275 /*
276 * If we've already gotten our DATAEND / DATABLKEND
277 * for this request, then complete it through here.
278 */
279 msmsdcc_stop_data(host);
280
281 if (!mrq->data->error)
282 host->curr.data_xfered = host->curr.xfer_size;
283 if (!mrq->data->stop || mrq->cmd->error) {
284 host->curr.mrq = NULL;
285 host->curr.cmd = NULL;
286 mrq->data->bytes_xfered = host->curr.data_xfered;
287
288 spin_unlock_irqrestore(&host->lock, flags);
289 #if BUSCLK_PWRSAVE
290 msmsdcc_disable_clocks(host, 1);
291 #endif
292 mmc_request_done(host->mmc, mrq);
293 return;
294 } else
295 msmsdcc_start_command(host, mrq->data->stop, 0);
296 }
297
298 out:
299 spin_unlock_irqrestore(&host->lock, flags);
300 return;
301 }
302
303 static void
msmsdcc_dma_complete_func(struct msm_dmov_cmd * cmd,unsigned int result,struct msm_dmov_errdata * err)304 msmsdcc_dma_complete_func(struct msm_dmov_cmd *cmd,
305 unsigned int result,
306 struct msm_dmov_errdata *err)
307 {
308 struct msmsdcc_dma_data *dma_data =
309 container_of(cmd, struct msmsdcc_dma_data, hdr);
310 struct msmsdcc_host *host = dma_data->host;
311
312 dma_data->result = result;
313 if (err)
314 memcpy(&dma_data->err, err, sizeof(struct msm_dmov_errdata));
315
316 tasklet_schedule(&host->dma_tlet);
317 }
318
validate_dma(struct msmsdcc_host * host,struct mmc_data * data)319 static int validate_dma(struct msmsdcc_host *host, struct mmc_data *data)
320 {
321 if (host->dma.channel == -1)
322 return -ENOENT;
323
324 if ((data->blksz * data->blocks) < MCI_FIFOSIZE)
325 return -EINVAL;
326 if ((data->blksz * data->blocks) % MCI_FIFOSIZE)
327 return -EINVAL;
328 return 0;
329 }
330
msmsdcc_config_dma(struct msmsdcc_host * host,struct mmc_data * data)331 static int msmsdcc_config_dma(struct msmsdcc_host *host, struct mmc_data *data)
332 {
333 struct msmsdcc_nc_dmadata *nc;
334 dmov_box *box;
335 uint32_t rows;
336 uint32_t crci;
337 unsigned int n;
338 int i, rc;
339 struct scatterlist *sg = data->sg;
340
341 rc = validate_dma(host, data);
342 if (rc)
343 return rc;
344
345 host->dma.sg = data->sg;
346 host->dma.num_ents = data->sg_len;
347
348 BUG_ON(host->dma.num_ents > NR_SG); /* Prevent memory corruption */
349
350 nc = host->dma.nc;
351
352 switch (host->pdev_id) {
353 case 1:
354 crci = MSMSDCC_CRCI_SDC1;
355 break;
356 case 2:
357 crci = MSMSDCC_CRCI_SDC2;
358 break;
359 case 3:
360 crci = MSMSDCC_CRCI_SDC3;
361 break;
362 case 4:
363 crci = MSMSDCC_CRCI_SDC4;
364 break;
365 default:
366 host->dma.sg = NULL;
367 host->dma.num_ents = 0;
368 return -ENOENT;
369 }
370
371 if (data->flags & MMC_DATA_READ)
372 host->dma.dir = DMA_FROM_DEVICE;
373 else
374 host->dma.dir = DMA_TO_DEVICE;
375
376 host->curr.user_pages = 0;
377
378 box = &nc->cmd[0];
379
380 /* location of command block must be 64 bit aligned */
381 BUG_ON(host->dma.cmd_busaddr & 0x07);
382
383 nc->cmdptr = (host->dma.cmd_busaddr >> 3) | CMD_PTR_LP;
384 host->dma.hdr.cmdptr = DMOV_CMD_PTR_LIST |
385 DMOV_CMD_ADDR(host->dma.cmdptr_busaddr);
386 host->dma.hdr.complete_func = msmsdcc_dma_complete_func;
387
388 n = dma_map_sg(mmc_dev(host->mmc), host->dma.sg,
389 host->dma.num_ents, host->dma.dir);
390 if (n == 0) {
391 pr_err("%s: Unable to map in all sg elements\n",
392 mmc_hostname(host->mmc));
393 host->dma.sg = NULL;
394 host->dma.num_ents = 0;
395 return -ENOMEM;
396 }
397
398 for_each_sg(host->dma.sg, sg, n, i) {
399
400 box->cmd = CMD_MODE_BOX;
401
402 if (i == n - 1)
403 box->cmd |= CMD_LC;
404 rows = (sg_dma_len(sg) % MCI_FIFOSIZE) ?
405 (sg_dma_len(sg) / MCI_FIFOSIZE) + 1 :
406 (sg_dma_len(sg) / MCI_FIFOSIZE) ;
407
408 if (data->flags & MMC_DATA_READ) {
409 box->src_row_addr = msmsdcc_fifo_addr(host);
410 box->dst_row_addr = sg_dma_address(sg);
411
412 box->src_dst_len = (MCI_FIFOSIZE << 16) |
413 (MCI_FIFOSIZE);
414 box->row_offset = MCI_FIFOSIZE;
415
416 box->num_rows = rows * ((1 << 16) + 1);
417 box->cmd |= CMD_SRC_CRCI(crci);
418 } else {
419 box->src_row_addr = sg_dma_address(sg);
420 box->dst_row_addr = msmsdcc_fifo_addr(host);
421
422 box->src_dst_len = (MCI_FIFOSIZE << 16) |
423 (MCI_FIFOSIZE);
424 box->row_offset = (MCI_FIFOSIZE << 16);
425
426 box->num_rows = rows * ((1 << 16) + 1);
427 box->cmd |= CMD_DST_CRCI(crci);
428 }
429 box++;
430 }
431
432 return 0;
433 }
434
435 static int
snoop_cccr_abort(struct mmc_command * cmd)436 snoop_cccr_abort(struct mmc_command *cmd)
437 {
438 if ((cmd->opcode == 52) &&
439 (cmd->arg & 0x80000000) &&
440 (((cmd->arg >> 9) & 0x1ffff) == SDIO_CCCR_ABORT))
441 return 1;
442 return 0;
443 }
444
445 static void
msmsdcc_start_command_deferred(struct msmsdcc_host * host,struct mmc_command * cmd,u32 * c)446 msmsdcc_start_command_deferred(struct msmsdcc_host *host,
447 struct mmc_command *cmd, u32 *c)
448 {
449 *c |= (cmd->opcode | MCI_CPSM_ENABLE);
450
451 if (cmd->flags & MMC_RSP_PRESENT) {
452 if (cmd->flags & MMC_RSP_136)
453 *c |= MCI_CPSM_LONGRSP;
454 *c |= MCI_CPSM_RESPONSE;
455 }
456
457 if (/*interrupt*/0)
458 *c |= MCI_CPSM_INTERRUPT;
459
460 if ((((cmd->opcode == 17) || (cmd->opcode == 18)) ||
461 ((cmd->opcode == 24) || (cmd->opcode == 25))) ||
462 (cmd->opcode == 53))
463 *c |= MCI_CSPM_DATCMD;
464
465 if (host->prog_scan && (cmd->opcode == 12)) {
466 *c |= MCI_CPSM_PROGENA;
467 host->prog_enable = true;
468 }
469
470 if (cmd == cmd->mrq->stop)
471 *c |= MCI_CSPM_MCIABORT;
472
473 if (snoop_cccr_abort(cmd))
474 *c |= MCI_CSPM_MCIABORT;
475
476 if (host->curr.cmd != NULL) {
477 pr_err("%s: Overlapping command requests\n",
478 mmc_hostname(host->mmc));
479 }
480 host->curr.cmd = cmd;
481 }
482
483 static void
msmsdcc_start_data(struct msmsdcc_host * host,struct mmc_data * data,struct mmc_command * cmd,u32 c)484 msmsdcc_start_data(struct msmsdcc_host *host, struct mmc_data *data,
485 struct mmc_command *cmd, u32 c)
486 {
487 unsigned int datactrl, timeout;
488 unsigned long long clks;
489 unsigned int pio_irqmask = 0;
490
491 host->curr.data = data;
492 host->curr.xfer_size = data->blksz * data->blocks;
493 host->curr.xfer_remain = host->curr.xfer_size;
494 host->curr.data_xfered = 0;
495 host->curr.got_dataend = 0;
496
497 memset(&host->pio, 0, sizeof(host->pio));
498
499 datactrl = MCI_DPSM_ENABLE | (data->blksz << 4);
500
501 if (!msmsdcc_config_dma(host, data))
502 datactrl |= MCI_DPSM_DMAENABLE;
503 else {
504 host->pio.sg = data->sg;
505 host->pio.sg_len = data->sg_len;
506 host->pio.sg_off = 0;
507
508 if (data->flags & MMC_DATA_READ) {
509 pio_irqmask = MCI_RXFIFOHALFFULLMASK;
510 if (host->curr.xfer_remain < MCI_FIFOSIZE)
511 pio_irqmask |= MCI_RXDATAAVLBLMASK;
512 } else
513 pio_irqmask = MCI_TXFIFOHALFEMPTYMASK;
514 }
515
516 if (data->flags & MMC_DATA_READ)
517 datactrl |= MCI_DPSM_DIRECTION;
518
519 clks = (unsigned long long)data->timeout_ns * host->clk_rate;
520 do_div(clks, NSEC_PER_SEC);
521 timeout = data->timeout_clks + (unsigned int)clks*2 ;
522
523 if (datactrl & MCI_DPSM_DMAENABLE) {
524 /* Save parameters for the exec function */
525 host->cmd_timeout = timeout;
526 host->cmd_pio_irqmask = pio_irqmask;
527 host->cmd_datactrl = datactrl;
528 host->cmd_cmd = cmd;
529
530 host->dma.hdr.execute_func = msmsdcc_dma_exec_func;
531 host->dma.hdr.data = (void *)host;
532 host->dma.busy = 1;
533
534 if (cmd) {
535 msmsdcc_start_command_deferred(host, cmd, &c);
536 host->cmd_c = c;
537 }
538 msm_dmov_enqueue_cmd(host->dma.channel, &host->dma.hdr);
539 if (data->flags & MMC_DATA_WRITE)
540 host->prog_scan = true;
541 } else {
542 msmsdcc_writel(host, timeout, MMCIDATATIMER);
543
544 msmsdcc_writel(host, host->curr.xfer_size, MMCIDATALENGTH);
545
546 msmsdcc_writel(host, (msmsdcc_readl(host, MMCIMASK0) &
547 (~MCI_IRQ_PIO)) | pio_irqmask, MMCIMASK0);
548
549 msmsdcc_writel(host, datactrl, MMCIDATACTRL);
550
551 if (cmd) {
552 /* Daisy-chain the command if requested */
553 msmsdcc_start_command(host, cmd, c);
554 }
555 }
556 }
557
558 static void
msmsdcc_start_command(struct msmsdcc_host * host,struct mmc_command * cmd,u32 c)559 msmsdcc_start_command(struct msmsdcc_host *host, struct mmc_command *cmd, u32 c)
560 {
561 if (cmd == cmd->mrq->stop)
562 c |= MCI_CSPM_MCIABORT;
563
564 host->stats.cmds++;
565
566 msmsdcc_start_command_deferred(host, cmd, &c);
567 msmsdcc_start_command_exec(host, cmd->arg, c);
568 }
569
570 static void
msmsdcc_data_err(struct msmsdcc_host * host,struct mmc_data * data,unsigned int status)571 msmsdcc_data_err(struct msmsdcc_host *host, struct mmc_data *data,
572 unsigned int status)
573 {
574 if (status & MCI_DATACRCFAIL) {
575 pr_err("%s: Data CRC error\n", mmc_hostname(host->mmc));
576 pr_err("%s: opcode 0x%.8x\n", __func__,
577 data->mrq->cmd->opcode);
578 pr_err("%s: blksz %d, blocks %d\n", __func__,
579 data->blksz, data->blocks);
580 data->error = -EILSEQ;
581 } else if (status & MCI_DATATIMEOUT) {
582 pr_err("%s: Data timeout\n", mmc_hostname(host->mmc));
583 data->error = -ETIMEDOUT;
584 } else if (status & MCI_RXOVERRUN) {
585 pr_err("%s: RX overrun\n", mmc_hostname(host->mmc));
586 data->error = -EIO;
587 } else if (status & MCI_TXUNDERRUN) {
588 pr_err("%s: TX underrun\n", mmc_hostname(host->mmc));
589 data->error = -EIO;
590 } else {
591 pr_err("%s: Unknown error (0x%.8x)\n",
592 mmc_hostname(host->mmc), status);
593 data->error = -EIO;
594 }
595 }
596
597
598 static int
msmsdcc_pio_read(struct msmsdcc_host * host,char * buffer,unsigned int remain)599 msmsdcc_pio_read(struct msmsdcc_host *host, char *buffer, unsigned int remain)
600 {
601 uint32_t *ptr = (uint32_t *) buffer;
602 int count = 0;
603
604 if (remain % 4)
605 remain = ((remain >> 2) + 1) << 2;
606
607 while (msmsdcc_readl(host, MMCISTATUS) & MCI_RXDATAAVLBL) {
608 *ptr = msmsdcc_readl(host, MMCIFIFO + (count % MCI_FIFOSIZE));
609 ptr++;
610 count += sizeof(uint32_t);
611
612 remain -= sizeof(uint32_t);
613 if (remain == 0)
614 break;
615 }
616 return count;
617 }
618
619 static int
msmsdcc_pio_write(struct msmsdcc_host * host,char * buffer,unsigned int remain,u32 status)620 msmsdcc_pio_write(struct msmsdcc_host *host, char *buffer,
621 unsigned int remain, u32 status)
622 {
623 void __iomem *base = host->base;
624 char *ptr = buffer;
625
626 do {
627 unsigned int count, maxcnt, sz;
628
629 maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE :
630 MCI_FIFOHALFSIZE;
631 count = min(remain, maxcnt);
632
633 sz = count % 4 ? (count >> 2) + 1 : (count >> 2);
634 writesl(base + MMCIFIFO, ptr, sz);
635 ptr += count;
636 remain -= count;
637
638 if (remain == 0)
639 break;
640
641 status = msmsdcc_readl(host, MMCISTATUS);
642 } while (status & MCI_TXFIFOHALFEMPTY);
643
644 return ptr - buffer;
645 }
646
647 static int
msmsdcc_spin_on_status(struct msmsdcc_host * host,uint32_t mask,int maxspin)648 msmsdcc_spin_on_status(struct msmsdcc_host *host, uint32_t mask, int maxspin)
649 {
650 while (maxspin) {
651 if ((msmsdcc_readl(host, MMCISTATUS) & mask))
652 return 0;
653 udelay(1);
654 --maxspin;
655 }
656 return -ETIMEDOUT;
657 }
658
659 static irqreturn_t
msmsdcc_pio_irq(int irq,void * dev_id)660 msmsdcc_pio_irq(int irq, void *dev_id)
661 {
662 struct msmsdcc_host *host = dev_id;
663 uint32_t status;
664 u32 mci_mask0;
665
666 status = msmsdcc_readl(host, MMCISTATUS);
667 mci_mask0 = msmsdcc_readl(host, MMCIMASK0);
668
669 if (((mci_mask0 & status) & MCI_IRQ_PIO) == 0)
670 return IRQ_NONE;
671
672 do {
673 unsigned long flags;
674 unsigned int remain, len;
675 char *buffer;
676
677 if (!(status & (MCI_TXFIFOHALFEMPTY | MCI_RXDATAAVLBL))) {
678 if (host->curr.xfer_remain == 0 || !msmsdcc_piopoll)
679 break;
680
681 if (msmsdcc_spin_on_status(host,
682 (MCI_TXFIFOHALFEMPTY |
683 MCI_RXDATAAVLBL),
684 PIO_SPINMAX)) {
685 break;
686 }
687 }
688
689 /* Map the current scatter buffer */
690 local_irq_save(flags);
691 buffer = kmap_atomic(sg_page(host->pio.sg))
692 + host->pio.sg->offset;
693 buffer += host->pio.sg_off;
694 remain = host->pio.sg->length - host->pio.sg_off;
695 len = 0;
696 if (status & MCI_RXACTIVE)
697 len = msmsdcc_pio_read(host, buffer, remain);
698 if (status & MCI_TXACTIVE)
699 len = msmsdcc_pio_write(host, buffer, remain, status);
700
701 /* Unmap the buffer */
702 kunmap_atomic(buffer);
703 local_irq_restore(flags);
704
705 host->pio.sg_off += len;
706 host->curr.xfer_remain -= len;
707 host->curr.data_xfered += len;
708 remain -= len;
709
710 if (remain == 0) {
711 /* This sg page is full - do some housekeeping */
712 if (status & MCI_RXACTIVE && host->curr.user_pages)
713 flush_dcache_page(sg_page(host->pio.sg));
714
715 if (!--host->pio.sg_len) {
716 memset(&host->pio, 0, sizeof(host->pio));
717 break;
718 }
719
720 /* Advance to next sg */
721 host->pio.sg++;
722 host->pio.sg_off = 0;
723 }
724
725 status = msmsdcc_readl(host, MMCISTATUS);
726 } while (1);
727
728 if (status & MCI_RXACTIVE && host->curr.xfer_remain < MCI_FIFOSIZE)
729 msmsdcc_writel(host, (mci_mask0 & (~MCI_IRQ_PIO)) |
730 MCI_RXDATAAVLBLMASK, MMCIMASK0);
731
732 if (!host->curr.xfer_remain)
733 msmsdcc_writel(host, (mci_mask0 & (~MCI_IRQ_PIO)) | 0,
734 MMCIMASK0);
735
736 return IRQ_HANDLED;
737 }
738
msmsdcc_do_cmdirq(struct msmsdcc_host * host,uint32_t status)739 static void msmsdcc_do_cmdirq(struct msmsdcc_host *host, uint32_t status)
740 {
741 struct mmc_command *cmd = host->curr.cmd;
742
743 host->curr.cmd = NULL;
744 cmd->resp[0] = msmsdcc_readl(host, MMCIRESPONSE0);
745 cmd->resp[1] = msmsdcc_readl(host, MMCIRESPONSE1);
746 cmd->resp[2] = msmsdcc_readl(host, MMCIRESPONSE2);
747 cmd->resp[3] = msmsdcc_readl(host, MMCIRESPONSE3);
748
749 if (status & MCI_CMDTIMEOUT) {
750 cmd->error = -ETIMEDOUT;
751 } else if (status & MCI_CMDCRCFAIL &&
752 cmd->flags & MMC_RSP_CRC) {
753 pr_err("%s: Command CRC error\n", mmc_hostname(host->mmc));
754 cmd->error = -EILSEQ;
755 }
756
757 if (!cmd->data || cmd->error) {
758 if (host->curr.data && host->dma.sg)
759 msm_dmov_stop_cmd(host->dma.channel,
760 &host->dma.hdr, 0);
761 else if (host->curr.data) { /* Non DMA */
762 msmsdcc_reset_and_restore(host);
763 msmsdcc_stop_data(host);
764 msmsdcc_request_end(host, cmd->mrq);
765 } else { /* host->data == NULL */
766 if (!cmd->error && host->prog_enable) {
767 if (status & MCI_PROGDONE) {
768 host->prog_scan = false;
769 host->prog_enable = false;
770 msmsdcc_request_end(host, cmd->mrq);
771 } else {
772 host->curr.cmd = cmd;
773 }
774 } else {
775 if (host->prog_enable) {
776 host->prog_scan = false;
777 host->prog_enable = false;
778 }
779 msmsdcc_request_end(host, cmd->mrq);
780 }
781 }
782 } else if (cmd->data)
783 if (!(cmd->data->flags & MMC_DATA_READ))
784 msmsdcc_start_data(host, cmd->data,
785 NULL, 0);
786 }
787
788 static void
msmsdcc_handle_irq_data(struct msmsdcc_host * host,u32 status,void __iomem * base)789 msmsdcc_handle_irq_data(struct msmsdcc_host *host, u32 status,
790 void __iomem *base)
791 {
792 struct mmc_data *data = host->curr.data;
793
794 if (status & (MCI_CMDSENT | MCI_CMDRESPEND | MCI_CMDCRCFAIL |
795 MCI_CMDTIMEOUT | MCI_PROGDONE) && host->curr.cmd) {
796 msmsdcc_do_cmdirq(host, status);
797 }
798
799 if (!data)
800 return;
801
802 /* Check for data errors */
803 if (status & (MCI_DATACRCFAIL | MCI_DATATIMEOUT |
804 MCI_TXUNDERRUN | MCI_RXOVERRUN)) {
805 msmsdcc_data_err(host, data, status);
806 host->curr.data_xfered = 0;
807 if (host->dma.sg)
808 msm_dmov_stop_cmd(host->dma.channel,
809 &host->dma.hdr, 0);
810 else {
811 msmsdcc_reset_and_restore(host);
812 if (host->curr.data)
813 msmsdcc_stop_data(host);
814 if (!data->stop)
815 msmsdcc_request_end(host, data->mrq);
816 else
817 msmsdcc_start_command(host, data->stop, 0);
818 }
819 }
820
821 /* Check for data done */
822 if (!host->curr.got_dataend && (status & MCI_DATAEND))
823 host->curr.got_dataend = 1;
824
825 /*
826 * If DMA is still in progress, we complete via the completion handler
827 */
828 if (host->curr.got_dataend && !host->dma.busy) {
829 /*
830 * There appears to be an issue in the controller where
831 * if you request a small block transfer (< fifo size),
832 * you may get your DATAEND/DATABLKEND irq without the
833 * PIO data irq.
834 *
835 * Check to see if there is still data to be read,
836 * and simulate a PIO irq.
837 */
838 if (readl(base + MMCISTATUS) & MCI_RXDATAAVLBL)
839 msmsdcc_pio_irq(1, host);
840
841 msmsdcc_stop_data(host);
842 if (!data->error)
843 host->curr.data_xfered = host->curr.xfer_size;
844
845 if (!data->stop)
846 msmsdcc_request_end(host, data->mrq);
847 else
848 msmsdcc_start_command(host, data->stop, 0);
849 }
850 }
851
852 static irqreturn_t
msmsdcc_irq(int irq,void * dev_id)853 msmsdcc_irq(int irq, void *dev_id)
854 {
855 struct msmsdcc_host *host = dev_id;
856 void __iomem *base = host->base;
857 u32 status;
858 int ret = 0;
859 int cardint = 0;
860
861 spin_lock(&host->lock);
862
863 do {
864 status = msmsdcc_readl(host, MMCISTATUS);
865 status &= msmsdcc_readl(host, MMCIMASK0);
866 if ((status & (~MCI_IRQ_PIO)) == 0)
867 break;
868 msmsdcc_writel(host, status, MMCICLEAR);
869
870 if (status & MCI_SDIOINTR)
871 status &= ~MCI_SDIOINTR;
872
873 if (!status)
874 break;
875
876 msmsdcc_handle_irq_data(host, status, base);
877
878 if (status & MCI_SDIOINTOPER) {
879 cardint = 1;
880 status &= ~MCI_SDIOINTOPER;
881 }
882 ret = 1;
883 } while (status);
884
885 spin_unlock(&host->lock);
886
887 /*
888 * We have to delay handling the card interrupt as it calls
889 * back into the driver.
890 */
891 if (cardint)
892 mmc_signal_sdio_irq(host->mmc);
893
894 return IRQ_RETVAL(ret);
895 }
896
897 static void
msmsdcc_request(struct mmc_host * mmc,struct mmc_request * mrq)898 msmsdcc_request(struct mmc_host *mmc, struct mmc_request *mrq)
899 {
900 struct msmsdcc_host *host = mmc_priv(mmc);
901 unsigned long flags;
902
903 WARN_ON(host->curr.mrq != NULL);
904 WARN_ON(host->pwr == 0);
905
906 spin_lock_irqsave(&host->lock, flags);
907
908 host->stats.reqs++;
909
910 if (host->eject) {
911 if (mrq->data && !(mrq->data->flags & MMC_DATA_READ)) {
912 mrq->cmd->error = 0;
913 mrq->data->bytes_xfered = mrq->data->blksz *
914 mrq->data->blocks;
915 } else
916 mrq->cmd->error = -ENOMEDIUM;
917
918 spin_unlock_irqrestore(&host->lock, flags);
919 mmc_request_done(mmc, mrq);
920 return;
921 }
922
923 msmsdcc_enable_clocks(host);
924
925 host->curr.mrq = mrq;
926
927 if (mrq->data && mrq->data->flags & MMC_DATA_READ)
928 /* Queue/read data, daisy-chain command when data starts */
929 msmsdcc_start_data(host, mrq->data, mrq->cmd, 0);
930 else
931 msmsdcc_start_command(host, mrq->cmd, 0);
932
933 if (host->cmdpoll && !msmsdcc_spin_on_status(host,
934 MCI_CMDRESPEND|MCI_CMDCRCFAIL|MCI_CMDTIMEOUT,
935 CMD_SPINMAX)) {
936 uint32_t status = msmsdcc_readl(host, MMCISTATUS);
937 msmsdcc_do_cmdirq(host, status);
938 msmsdcc_writel(host,
939 MCI_CMDRESPEND | MCI_CMDCRCFAIL | MCI_CMDTIMEOUT,
940 MMCICLEAR);
941 host->stats.cmdpoll_hits++;
942 } else {
943 host->stats.cmdpoll_misses++;
944 }
945 spin_unlock_irqrestore(&host->lock, flags);
946 }
947
msmsdcc_setup_gpio(struct msmsdcc_host * host,bool enable)948 static void msmsdcc_setup_gpio(struct msmsdcc_host *host, bool enable)
949 {
950 struct msm_mmc_gpio_data *curr;
951 int i, rc = 0;
952
953 if (!host->plat->gpio_data || host->gpio_config_status == enable)
954 return;
955
956 curr = host->plat->gpio_data;
957 for (i = 0; i < curr->size; i++) {
958 if (enable) {
959 rc = gpio_request(curr->gpio[i].no,
960 curr->gpio[i].name);
961 if (rc) {
962 pr_err("%s: gpio_request(%d, %s) failed %d\n",
963 mmc_hostname(host->mmc),
964 curr->gpio[i].no,
965 curr->gpio[i].name, rc);
966 goto free_gpios;
967 }
968 } else {
969 gpio_free(curr->gpio[i].no);
970 }
971 }
972 host->gpio_config_status = enable;
973 return;
974
975 free_gpios:
976 for (; i >= 0; i--)
977 gpio_free(curr->gpio[i].no);
978 }
979
980 static void
msmsdcc_set_ios(struct mmc_host * mmc,struct mmc_ios * ios)981 msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
982 {
983 struct msmsdcc_host *host = mmc_priv(mmc);
984 u32 clk = 0, pwr = 0;
985 int rc;
986 unsigned long flags;
987
988 spin_lock_irqsave(&host->lock, flags);
989
990 msmsdcc_enable_clocks(host);
991
992 spin_unlock_irqrestore(&host->lock, flags);
993
994 if (ios->clock) {
995 if (ios->clock != host->clk_rate) {
996 rc = clk_set_rate(host->clk, ios->clock);
997 if (rc < 0)
998 pr_err("%s: Error setting clock rate (%d)\n",
999 mmc_hostname(host->mmc), rc);
1000 else
1001 host->clk_rate = ios->clock;
1002 }
1003 clk |= MCI_CLK_ENABLE;
1004 }
1005
1006 if (ios->bus_width == MMC_BUS_WIDTH_4)
1007 clk |= (2 << 10); /* Set WIDEBUS */
1008
1009 if (ios->clock > 400000 && msmsdcc_pwrsave)
1010 clk |= (1 << 9); /* PWRSAVE */
1011
1012 clk |= (1 << 12); /* FLOW_ENA */
1013 clk |= (1 << 15); /* feedback clock */
1014
1015 if (host->plat->translate_vdd)
1016 pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
1017
1018 switch (ios->power_mode) {
1019 case MMC_POWER_OFF:
1020 msmsdcc_setup_gpio(host, false);
1021 break;
1022 case MMC_POWER_UP:
1023 pwr |= MCI_PWR_UP;
1024 msmsdcc_setup_gpio(host, true);
1025 break;
1026 case MMC_POWER_ON:
1027 pwr |= MCI_PWR_ON;
1028 break;
1029 }
1030
1031 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
1032 pwr |= MCI_OD;
1033
1034 msmsdcc_writel(host, clk, MMCICLOCK);
1035
1036 if (host->pwr != pwr) {
1037 host->pwr = pwr;
1038 msmsdcc_writel(host, pwr, MMCIPOWER);
1039 }
1040 #if BUSCLK_PWRSAVE
1041 spin_lock_irqsave(&host->lock, flags);
1042 msmsdcc_disable_clocks(host, 1);
1043 spin_unlock_irqrestore(&host->lock, flags);
1044 #endif
1045 }
1046
msmsdcc_enable_sdio_irq(struct mmc_host * mmc,int enable)1047 static void msmsdcc_enable_sdio_irq(struct mmc_host *mmc, int enable)
1048 {
1049 struct msmsdcc_host *host = mmc_priv(mmc);
1050 unsigned long flags;
1051 u32 status;
1052
1053 spin_lock_irqsave(&host->lock, flags);
1054 if (msmsdcc_sdioirq == 1) {
1055 status = msmsdcc_readl(host, MMCIMASK0);
1056 if (enable)
1057 status |= MCI_SDIOINTOPERMASK;
1058 else
1059 status &= ~MCI_SDIOINTOPERMASK;
1060 host->saved_irq0mask = status;
1061 msmsdcc_writel(host, status, MMCIMASK0);
1062 }
1063 spin_unlock_irqrestore(&host->lock, flags);
1064 }
1065
msmsdcc_init_card(struct mmc_host * mmc,struct mmc_card * card)1066 static void msmsdcc_init_card(struct mmc_host *mmc, struct mmc_card *card)
1067 {
1068 struct msmsdcc_host *host = mmc_priv(mmc);
1069
1070 if (host->plat->init_card)
1071 host->plat->init_card(card);
1072 }
1073
1074 static const struct mmc_host_ops msmsdcc_ops = {
1075 .request = msmsdcc_request,
1076 .set_ios = msmsdcc_set_ios,
1077 .enable_sdio_irq = msmsdcc_enable_sdio_irq,
1078 .init_card = msmsdcc_init_card,
1079 };
1080
1081 static void
msmsdcc_check_status(unsigned long data)1082 msmsdcc_check_status(unsigned long data)
1083 {
1084 struct msmsdcc_host *host = (struct msmsdcc_host *)data;
1085 unsigned int status;
1086
1087 if (!host->plat->status) {
1088 mmc_detect_change(host->mmc, 0);
1089 goto out;
1090 }
1091
1092 status = host->plat->status(mmc_dev(host->mmc));
1093 host->eject = !status;
1094 if (status ^ host->oldstat) {
1095 pr_info("%s: Slot status change detected (%d -> %d)\n",
1096 mmc_hostname(host->mmc), host->oldstat, status);
1097 if (status)
1098 mmc_detect_change(host->mmc, (5 * HZ) / 2);
1099 else
1100 mmc_detect_change(host->mmc, 0);
1101 }
1102
1103 host->oldstat = status;
1104
1105 out:
1106 if (host->timer.function)
1107 mod_timer(&host->timer, jiffies + HZ);
1108 }
1109
1110 static irqreturn_t
msmsdcc_platform_status_irq(int irq,void * dev_id)1111 msmsdcc_platform_status_irq(int irq, void *dev_id)
1112 {
1113 struct msmsdcc_host *host = dev_id;
1114
1115 pr_debug("%s: %d\n", __func__, irq);
1116 msmsdcc_check_status((unsigned long) host);
1117 return IRQ_HANDLED;
1118 }
1119
1120 static void
msmsdcc_status_notify_cb(int card_present,void * dev_id)1121 msmsdcc_status_notify_cb(int card_present, void *dev_id)
1122 {
1123 struct msmsdcc_host *host = dev_id;
1124
1125 pr_debug("%s: card_present %d\n", mmc_hostname(host->mmc),
1126 card_present);
1127 msmsdcc_check_status((unsigned long) host);
1128 }
1129
1130 static void
msmsdcc_busclk_expired(unsigned long _data)1131 msmsdcc_busclk_expired(unsigned long _data)
1132 {
1133 struct msmsdcc_host *host = (struct msmsdcc_host *) _data;
1134
1135 if (host->clks_on)
1136 msmsdcc_disable_clocks(host, 0);
1137 }
1138
1139 static int
msmsdcc_init_dma(struct msmsdcc_host * host)1140 msmsdcc_init_dma(struct msmsdcc_host *host)
1141 {
1142 memset(&host->dma, 0, sizeof(struct msmsdcc_dma_data));
1143 host->dma.host = host;
1144 host->dma.channel = -1;
1145
1146 if (!host->dmares)
1147 return -ENODEV;
1148
1149 host->dma.nc = dma_alloc_coherent(NULL,
1150 sizeof(struct msmsdcc_nc_dmadata),
1151 &host->dma.nc_busaddr,
1152 GFP_KERNEL);
1153 if (host->dma.nc == NULL) {
1154 pr_err("Unable to allocate DMA buffer\n");
1155 return -ENOMEM;
1156 }
1157 memset(host->dma.nc, 0x00, sizeof(struct msmsdcc_nc_dmadata));
1158 host->dma.cmd_busaddr = host->dma.nc_busaddr;
1159 host->dma.cmdptr_busaddr = host->dma.nc_busaddr +
1160 offsetof(struct msmsdcc_nc_dmadata, cmdptr);
1161 host->dma.channel = host->dmares->start;
1162
1163 return 0;
1164 }
1165
1166 static int
msmsdcc_probe(struct platform_device * pdev)1167 msmsdcc_probe(struct platform_device *pdev)
1168 {
1169 struct msm_mmc_platform_data *plat = pdev->dev.platform_data;
1170 struct msmsdcc_host *host;
1171 struct mmc_host *mmc;
1172 struct resource *cmd_irqres = NULL;
1173 struct resource *stat_irqres = NULL;
1174 struct resource *memres = NULL;
1175 struct resource *dmares = NULL;
1176 int ret;
1177
1178 /* must have platform data */
1179 if (!plat) {
1180 pr_err("%s: Platform data not available\n", __func__);
1181 ret = -EINVAL;
1182 goto out;
1183 }
1184
1185 if (pdev->id < 1 || pdev->id > 4)
1186 return -EINVAL;
1187
1188 if (pdev->resource == NULL || pdev->num_resources < 2) {
1189 pr_err("%s: Invalid resource\n", __func__);
1190 return -ENXIO;
1191 }
1192
1193 memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1194 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1195 cmd_irqres = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
1196 "cmd_irq");
1197 stat_irqres = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
1198 "status_irq");
1199
1200 if (!cmd_irqres || !memres) {
1201 pr_err("%s: Invalid resource\n", __func__);
1202 return -ENXIO;
1203 }
1204
1205 /*
1206 * Setup our host structure
1207 */
1208
1209 mmc = mmc_alloc_host(sizeof(struct msmsdcc_host), &pdev->dev);
1210 if (!mmc) {
1211 ret = -ENOMEM;
1212 goto out;
1213 }
1214
1215 host = mmc_priv(mmc);
1216 host->pdev_id = pdev->id;
1217 host->plat = plat;
1218 host->mmc = mmc;
1219 host->curr.cmd = NULL;
1220 init_timer(&host->busclk_timer);
1221 host->busclk_timer.data = (unsigned long) host;
1222 host->busclk_timer.function = msmsdcc_busclk_expired;
1223
1224
1225 host->cmdpoll = 1;
1226
1227 host->base = ioremap(memres->start, PAGE_SIZE);
1228 if (!host->base) {
1229 ret = -ENOMEM;
1230 goto host_free;
1231 }
1232
1233 host->cmd_irqres = cmd_irqres;
1234 host->memres = memres;
1235 host->dmares = dmares;
1236 spin_lock_init(&host->lock);
1237
1238 tasklet_init(&host->dma_tlet, msmsdcc_dma_complete_tlet,
1239 (unsigned long)host);
1240
1241 /*
1242 * Setup DMA
1243 */
1244 if (host->dmares) {
1245 ret = msmsdcc_init_dma(host);
1246 if (ret)
1247 goto ioremap_free;
1248 } else {
1249 host->dma.channel = -1;
1250 }
1251
1252 /* Get our clocks */
1253 host->pclk = clk_get(&pdev->dev, "sdc_pclk");
1254 if (IS_ERR(host->pclk)) {
1255 ret = PTR_ERR(host->pclk);
1256 goto dma_free;
1257 }
1258
1259 host->clk = clk_get(&pdev->dev, "sdc_clk");
1260 if (IS_ERR(host->clk)) {
1261 ret = PTR_ERR(host->clk);
1262 goto pclk_put;
1263 }
1264
1265 ret = clk_set_rate(host->clk, msmsdcc_fmin);
1266 if (ret) {
1267 pr_err("%s: Clock rate set failed (%d)\n", __func__, ret);
1268 goto clk_put;
1269 }
1270
1271 ret = clk_prepare(host->pclk);
1272 if (ret)
1273 goto clk_put;
1274
1275 ret = clk_prepare(host->clk);
1276 if (ret)
1277 goto clk_unprepare_p;
1278
1279 /* Enable clocks */
1280 ret = msmsdcc_enable_clocks(host);
1281 if (ret)
1282 goto clk_unprepare;
1283
1284 host->pclk_rate = clk_get_rate(host->pclk);
1285 host->clk_rate = clk_get_rate(host->clk);
1286
1287 /*
1288 * Setup MMC host structure
1289 */
1290 mmc->ops = &msmsdcc_ops;
1291 mmc->f_min = msmsdcc_fmin;
1292 mmc->f_max = msmsdcc_fmax;
1293 mmc->ocr_avail = plat->ocr_mask;
1294
1295 if (msmsdcc_4bit)
1296 mmc->caps |= MMC_CAP_4_BIT_DATA;
1297 if (msmsdcc_sdioirq)
1298 mmc->caps |= MMC_CAP_SDIO_IRQ;
1299 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED;
1300
1301 mmc->max_segs = NR_SG;
1302 mmc->max_blk_size = 4096; /* MCI_DATA_CTL BLOCKSIZE up to 4096 */
1303 mmc->max_blk_count = 65536;
1304
1305 mmc->max_req_size = 33554432; /* MCI_DATA_LENGTH is 25 bits */
1306 mmc->max_seg_size = mmc->max_req_size;
1307
1308 msmsdcc_writel(host, 0, MMCIMASK0);
1309 msmsdcc_writel(host, 0x5e007ff, MMCICLEAR);
1310
1311 msmsdcc_writel(host, MCI_IRQENABLE, MMCIMASK0);
1312 host->saved_irq0mask = MCI_IRQENABLE;
1313
1314 /*
1315 * Setup card detect change
1316 */
1317
1318 memset(&host->timer, 0, sizeof(host->timer));
1319
1320 if (stat_irqres && !(stat_irqres->flags & IORESOURCE_DISABLED)) {
1321 unsigned long irqflags = IRQF_SHARED |
1322 (stat_irqres->flags & IRQF_TRIGGER_MASK);
1323
1324 host->stat_irq = stat_irqres->start;
1325 ret = request_irq(host->stat_irq,
1326 msmsdcc_platform_status_irq,
1327 irqflags,
1328 DRIVER_NAME " (slot)",
1329 host);
1330 if (ret) {
1331 pr_err("%s: Unable to get slot IRQ %d (%d)\n",
1332 mmc_hostname(mmc), host->stat_irq, ret);
1333 goto clk_disable;
1334 }
1335 } else if (plat->register_status_notify) {
1336 plat->register_status_notify(msmsdcc_status_notify_cb, host);
1337 } else if (!plat->status)
1338 pr_err("%s: No card detect facilities available\n",
1339 mmc_hostname(mmc));
1340 else {
1341 init_timer(&host->timer);
1342 host->timer.data = (unsigned long)host;
1343 host->timer.function = msmsdcc_check_status;
1344 host->timer.expires = jiffies + HZ;
1345 add_timer(&host->timer);
1346 }
1347
1348 if (plat->status) {
1349 host->oldstat = host->plat->status(mmc_dev(host->mmc));
1350 host->eject = !host->oldstat;
1351 }
1352
1353 ret = request_irq(cmd_irqres->start, msmsdcc_irq, IRQF_SHARED,
1354 DRIVER_NAME " (cmd)", host);
1355 if (ret)
1356 goto stat_irq_free;
1357
1358 ret = request_irq(cmd_irqres->start, msmsdcc_pio_irq, IRQF_SHARED,
1359 DRIVER_NAME " (pio)", host);
1360 if (ret)
1361 goto cmd_irq_free;
1362
1363 mmc_set_drvdata(pdev, mmc);
1364 mmc_add_host(mmc);
1365
1366 pr_info("%s: Qualcomm MSM SDCC at 0x%016llx irq %d,%d dma %d\n",
1367 mmc_hostname(mmc), (unsigned long long)memres->start,
1368 (unsigned int) cmd_irqres->start,
1369 (unsigned int) host->stat_irq, host->dma.channel);
1370 pr_info("%s: 4 bit data mode %s\n", mmc_hostname(mmc),
1371 (mmc->caps & MMC_CAP_4_BIT_DATA ? "enabled" : "disabled"));
1372 pr_info("%s: MMC clock %u -> %u Hz, PCLK %u Hz\n",
1373 mmc_hostname(mmc), msmsdcc_fmin, msmsdcc_fmax, host->pclk_rate);
1374 pr_info("%s: Slot eject status = %d\n", mmc_hostname(mmc), host->eject);
1375 pr_info("%s: Power save feature enable = %d\n",
1376 mmc_hostname(mmc), msmsdcc_pwrsave);
1377
1378 if (host->dma.channel != -1) {
1379 pr_info("%s: DM non-cached buffer at %p, dma_addr 0x%.8x\n",
1380 mmc_hostname(mmc), host->dma.nc, host->dma.nc_busaddr);
1381 pr_info("%s: DM cmd busaddr 0x%.8x, cmdptr busaddr 0x%.8x\n",
1382 mmc_hostname(mmc), host->dma.cmd_busaddr,
1383 host->dma.cmdptr_busaddr);
1384 } else
1385 pr_info("%s: PIO transfer enabled\n", mmc_hostname(mmc));
1386 if (host->timer.function)
1387 pr_info("%s: Polling status mode enabled\n", mmc_hostname(mmc));
1388
1389 return 0;
1390 cmd_irq_free:
1391 free_irq(cmd_irqres->start, host);
1392 stat_irq_free:
1393 if (host->stat_irq)
1394 free_irq(host->stat_irq, host);
1395 clk_disable:
1396 msmsdcc_disable_clocks(host, 0);
1397 clk_unprepare:
1398 clk_unprepare(host->clk);
1399 clk_unprepare_p:
1400 clk_unprepare(host->pclk);
1401 clk_put:
1402 clk_put(host->clk);
1403 pclk_put:
1404 clk_put(host->pclk);
1405 dma_free:
1406 if (host->dmares)
1407 dma_free_coherent(NULL, sizeof(struct msmsdcc_nc_dmadata),
1408 host->dma.nc, host->dma.nc_busaddr);
1409 ioremap_free:
1410 tasklet_kill(&host->dma_tlet);
1411 iounmap(host->base);
1412 host_free:
1413 mmc_free_host(mmc);
1414 out:
1415 return ret;
1416 }
1417
1418 #ifdef CONFIG_PM
1419 static int
msmsdcc_suspend(struct platform_device * dev,pm_message_t state)1420 msmsdcc_suspend(struct platform_device *dev, pm_message_t state)
1421 {
1422 struct mmc_host *mmc = mmc_get_drvdata(dev);
1423
1424 if (mmc) {
1425 struct msmsdcc_host *host = mmc_priv(mmc);
1426
1427 if (host->stat_irq)
1428 disable_irq(host->stat_irq);
1429
1430 msmsdcc_writel(host, 0, MMCIMASK0);
1431 if (host->clks_on)
1432 msmsdcc_disable_clocks(host, 0);
1433 }
1434 return 0;
1435 }
1436
1437 static int
msmsdcc_resume(struct platform_device * dev)1438 msmsdcc_resume(struct platform_device *dev)
1439 {
1440 struct mmc_host *mmc = mmc_get_drvdata(dev);
1441
1442 if (mmc) {
1443 struct msmsdcc_host *host = mmc_priv(mmc);
1444
1445 msmsdcc_enable_clocks(host);
1446
1447 msmsdcc_writel(host, host->saved_irq0mask, MMCIMASK0);
1448
1449 if (host->stat_irq)
1450 enable_irq(host->stat_irq);
1451 #if BUSCLK_PWRSAVE
1452 msmsdcc_disable_clocks(host, 1);
1453 #endif
1454 }
1455 return 0;
1456 }
1457 #else
1458 #define msmsdcc_suspend 0
1459 #define msmsdcc_resume 0
1460 #endif
1461
1462 static struct platform_driver msmsdcc_driver = {
1463 .probe = msmsdcc_probe,
1464 .suspend = msmsdcc_suspend,
1465 .resume = msmsdcc_resume,
1466 .driver = {
1467 .name = "msm_sdcc",
1468 },
1469 };
1470
1471 module_platform_driver(msmsdcc_driver);
1472
1473 MODULE_DESCRIPTION("Qualcomm MSM 7X00A Multimedia Card Interface driver");
1474 MODULE_LICENSE("GPL");
1475