Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5

Linux/drivers/mmc/host/pxamci.c

  1 /*
  2  *  linux/drivers/mmc/host/pxa.c - PXA MMCI driver
  3  *
  4  *  Copyright (C) 2003 Russell King, All Rights Reserved.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  *
 10  *  This hardware is really sick:
 11  *   - No way to clear interrupts.
 12  *   - Have to turn off the clock whenever we touch the device.
 13  *   - Doesn't tell you how many data blocks were transferred.
 14  *  Yuck!
 15  *
 16  *      1 and 3 byte data transfers not supported
 17  *      max block length up to 1023
 18  */
 19 #include <linux/module.h>
 20 #include <linux/init.h>
 21 #include <linux/ioport.h>
 22 #include <linux/platform_device.h>
 23 #include <linux/delay.h>
 24 #include <linux/interrupt.h>
 25 #include <linux/dmaengine.h>
 26 #include <linux/dma-mapping.h>
 27 #include <linux/dma/pxa-dma.h>
 28 #include <linux/clk.h>
 29 #include <linux/err.h>
 30 #include <linux/mmc/host.h>
 31 #include <linux/mmc/slot-gpio.h>
 32 #include <linux/io.h>
 33 #include <linux/regulator/consumer.h>
 34 #include <linux/gpio.h>
 35 #include <linux/gfp.h>
 36 #include <linux/of.h>
 37 #include <linux/of_gpio.h>
 38 #include <linux/of_device.h>
 39 
 40 #include <asm/sizes.h>
 41 
 42 #include <mach/hardware.h>
 43 #include <linux/platform_data/mmc-pxamci.h>
 44 
 45 #include "pxamci.h"
 46 
 47 #define DRIVER_NAME     "pxa2xx-mci"
 48 
 49 #define NR_SG   1
 50 #define CLKRT_OFF       (~0)
 51 
 52 #define mmc_has_26MHz()         (cpu_is_pxa300() || cpu_is_pxa310() \
 53                                 || cpu_is_pxa935())
 54 
 55 struct pxamci_host {
 56         struct mmc_host         *mmc;
 57         spinlock_t              lock;
 58         struct resource         *res;
 59         void __iomem            *base;
 60         struct clk              *clk;
 61         unsigned long           clkrate;
 62         int                     irq;
 63         unsigned int            clkrt;
 64         unsigned int            cmdat;
 65         unsigned int            imask;
 66         unsigned int            power_mode;
 67         struct pxamci_platform_data *pdata;
 68 
 69         struct mmc_request      *mrq;
 70         struct mmc_command      *cmd;
 71         struct mmc_data         *data;
 72 
 73         struct dma_chan         *dma_chan_rx;
 74         struct dma_chan         *dma_chan_tx;
 75         dma_cookie_t            dma_cookie;
 76         dma_addr_t              sg_dma;
 77         unsigned int            dma_len;
 78 
 79         unsigned int            dma_dir;
 80         unsigned int            dma_drcmrrx;
 81         unsigned int            dma_drcmrtx;
 82 
 83         struct regulator        *vcc;
 84 };
 85 
 86 static inline void pxamci_init_ocr(struct pxamci_host *host)
 87 {
 88 #ifdef CONFIG_REGULATOR
 89         host->vcc = devm_regulator_get_optional(mmc_dev(host->mmc), "vmmc");
 90 
 91         if (IS_ERR(host->vcc))
 92                 host->vcc = NULL;
 93         else {
 94                 host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc);
 95                 if (host->pdata && host->pdata->ocr_mask)
 96                         dev_warn(mmc_dev(host->mmc),
 97                                 "ocr_mask/setpower will not be used\n");
 98         }
 99 #endif
100         if (host->vcc == NULL) {
101                 /* fall-back to platform data */
102                 host->mmc->ocr_avail = host->pdata ?
103                         host->pdata->ocr_mask :
104                         MMC_VDD_32_33 | MMC_VDD_33_34;
105         }
106 }
107 
108 static inline int pxamci_set_power(struct pxamci_host *host,
109                                     unsigned char power_mode,
110                                     unsigned int vdd)
111 {
112         int on;
113 
114         if (host->vcc) {
115                 int ret;
116 
117                 if (power_mode == MMC_POWER_UP) {
118                         ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
119                         if (ret)
120                                 return ret;
121                 } else if (power_mode == MMC_POWER_OFF) {
122                         ret = mmc_regulator_set_ocr(host->mmc, host->vcc, 0);
123                         if (ret)
124                                 return ret;
125                 }
126         }
127         if (!host->vcc && host->pdata &&
128             gpio_is_valid(host->pdata->gpio_power)) {
129                 on = ((1 << vdd) & host->pdata->ocr_mask);
130                 gpio_set_value(host->pdata->gpio_power,
131                                !!on ^ host->pdata->gpio_power_invert);
132         }
133         if (!host->vcc && host->pdata && host->pdata->setpower)
134                 return host->pdata->setpower(mmc_dev(host->mmc), vdd);
135 
136         return 0;
137 }
138 
139 static void pxamci_stop_clock(struct pxamci_host *host)
140 {
141         if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
142                 unsigned long timeout = 10000;
143                 unsigned int v;
144 
145                 writel(STOP_CLOCK, host->base + MMC_STRPCL);
146 
147                 do {
148                         v = readl(host->base + MMC_STAT);
149                         if (!(v & STAT_CLK_EN))
150                                 break;
151                         udelay(1);
152                 } while (timeout--);
153 
154                 if (v & STAT_CLK_EN)
155                         dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
156         }
157 }
158 
159 static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
160 {
161         unsigned long flags;
162 
163         spin_lock_irqsave(&host->lock, flags);
164         host->imask &= ~mask;
165         writel(host->imask, host->base + MMC_I_MASK);
166         spin_unlock_irqrestore(&host->lock, flags);
167 }
168 
169 static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
170 {
171         unsigned long flags;
172 
173         spin_lock_irqsave(&host->lock, flags);
174         host->imask |= mask;
175         writel(host->imask, host->base + MMC_I_MASK);
176         spin_unlock_irqrestore(&host->lock, flags);
177 }
178 
179 static void pxamci_dma_irq(void *param);
180 
181 static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
182 {
183         struct dma_async_tx_descriptor *tx;
184         enum dma_data_direction direction;
185         struct dma_slave_config config;
186         struct dma_chan *chan;
187         unsigned int nob = data->blocks;
188         unsigned long long clks;
189         unsigned int timeout;
190         int ret;
191 
192         host->data = data;
193 
194         if (data->flags & MMC_DATA_STREAM)
195                 nob = 0xffff;
196 
197         writel(nob, host->base + MMC_NOB);
198         writel(data->blksz, host->base + MMC_BLKLEN);
199 
200         clks = (unsigned long long)data->timeout_ns * host->clkrate;
201         do_div(clks, 1000000000UL);
202         timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
203         writel((timeout + 255) / 256, host->base + MMC_RDTO);
204 
205         memset(&config, 0, sizeof(config));
206         config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
207         config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
208         config.src_addr = host->res->start + MMC_RXFIFO;
209         config.dst_addr = host->res->start + MMC_TXFIFO;
210         config.src_maxburst = 32;
211         config.dst_maxburst = 32;
212 
213         if (data->flags & MMC_DATA_READ) {
214                 host->dma_dir = DMA_FROM_DEVICE;
215                 direction = DMA_DEV_TO_MEM;
216                 chan = host->dma_chan_rx;
217         } else {
218                 host->dma_dir = DMA_TO_DEVICE;
219                 direction = DMA_MEM_TO_DEV;
220                 chan = host->dma_chan_tx;
221         }
222 
223         config.direction = direction;
224 
225         ret = dmaengine_slave_config(chan, &config);
226         if (ret < 0) {
227                 dev_err(mmc_dev(host->mmc), "dma slave config failed\n");
228                 return;
229         }
230 
231         host->dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
232                                    host->dma_dir);
233 
234         tx = dmaengine_prep_slave_sg(chan, data->sg, host->dma_len, direction,
235                                      DMA_PREP_INTERRUPT);
236         if (!tx) {
237                 dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
238                 return;
239         }
240 
241         if (!(data->flags & MMC_DATA_READ)) {
242                 tx->callback = pxamci_dma_irq;
243                 tx->callback_param = host;
244         }
245 
246         host->dma_cookie = dmaengine_submit(tx);
247 
248         /*
249          * workaround for erratum #91:
250          * only start DMA now if we are doing a read,
251          * otherwise we wait until CMD/RESP has finished
252          * before starting DMA.
253          */
254         if (!cpu_is_pxa27x() || data->flags & MMC_DATA_READ)
255                 dma_async_issue_pending(chan);
256 }
257 
258 static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
259 {
260         WARN_ON(host->cmd != NULL);
261         host->cmd = cmd;
262 
263         if (cmd->flags & MMC_RSP_BUSY)
264                 cmdat |= CMDAT_BUSY;
265 
266 #define RSP_TYPE(x)     ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
267         switch (RSP_TYPE(mmc_resp_type(cmd))) {
268         case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */
269                 cmdat |= CMDAT_RESP_SHORT;
270                 break;
271         case RSP_TYPE(MMC_RSP_R3):
272                 cmdat |= CMDAT_RESP_R3;
273                 break;
274         case RSP_TYPE(MMC_RSP_R2):
275                 cmdat |= CMDAT_RESP_R2;
276                 break;
277         default:
278                 break;
279         }
280 
281         writel(cmd->opcode, host->base + MMC_CMD);
282         writel(cmd->arg >> 16, host->base + MMC_ARGH);
283         writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
284         writel(cmdat, host->base + MMC_CMDAT);
285         writel(host->clkrt, host->base + MMC_CLKRT);
286 
287         writel(START_CLOCK, host->base + MMC_STRPCL);
288 
289         pxamci_enable_irq(host, END_CMD_RES);
290 }
291 
292 static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
293 {
294         host->mrq = NULL;
295         host->cmd = NULL;
296         host->data = NULL;
297         mmc_request_done(host->mmc, mrq);
298 }
299 
300 static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
301 {
302         struct mmc_command *cmd = host->cmd;
303         int i;
304         u32 v;
305 
306         if (!cmd)
307                 return 0;
308 
309         host->cmd = NULL;
310 
311         /*
312          * Did I mention this is Sick.  We always need to
313          * discard the upper 8 bits of the first 16-bit word.
314          */
315         v = readl(host->base + MMC_RES) & 0xffff;
316         for (i = 0; i < 4; i++) {
317                 u32 w1 = readl(host->base + MMC_RES) & 0xffff;
318                 u32 w2 = readl(host->base + MMC_RES) & 0xffff;
319                 cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
320                 v = w2;
321         }
322 
323         if (stat & STAT_TIME_OUT_RESPONSE) {
324                 cmd->error = -ETIMEDOUT;
325         } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
326                 /*
327                  * workaround for erratum #42:
328                  * Intel PXA27x Family Processor Specification Update Rev 001
329                  * A bogus CRC error can appear if the msb of a 136 bit
330                  * response is a one.
331                  */
332                 if (cpu_is_pxa27x() &&
333                     (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000))
334                         pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);
335                 else
336                         cmd->error = -EILSEQ;
337         }
338 
339         pxamci_disable_irq(host, END_CMD_RES);
340         if (host->data && !cmd->error) {
341                 pxamci_enable_irq(host, DATA_TRAN_DONE);
342                 /*
343                  * workaround for erratum #91, if doing write
344                  * enable DMA late
345                  */
346                 if (cpu_is_pxa27x() && host->data->flags & MMC_DATA_WRITE)
347                         dma_async_issue_pending(host->dma_chan_tx);
348         } else {
349                 pxamci_finish_request(host, host->mrq);
350         }
351 
352         return 1;
353 }
354 
355 static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
356 {
357         struct mmc_data *data = host->data;
358         struct dma_chan *chan;
359 
360         if (!data)
361                 return 0;
362 
363         if (data->flags & MMC_DATA_READ)
364                 chan = host->dma_chan_rx;
365         else
366                 chan = host->dma_chan_tx;
367         dma_unmap_sg(chan->device->dev,
368                      data->sg, data->sg_len, host->dma_dir);
369 
370         if (stat & STAT_READ_TIME_OUT)
371                 data->error = -ETIMEDOUT;
372         else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
373                 data->error = -EILSEQ;
374 
375         /*
376          * There appears to be a hardware design bug here.  There seems to
377          * be no way to find out how much data was transferred to the card.
378          * This means that if there was an error on any block, we mark all
379          * data blocks as being in error.
380          */
381         if (!data->error)
382                 data->bytes_xfered = data->blocks * data->blksz;
383         else
384                 data->bytes_xfered = 0;
385 
386         pxamci_disable_irq(host, DATA_TRAN_DONE);
387 
388         host->data = NULL;
389         if (host->mrq->stop) {
390                 pxamci_stop_clock(host);
391                 pxamci_start_cmd(host, host->mrq->stop, host->cmdat);
392         } else {
393                 pxamci_finish_request(host, host->mrq);
394         }
395 
396         return 1;
397 }
398 
399 static irqreturn_t pxamci_irq(int irq, void *devid)
400 {
401         struct pxamci_host *host = devid;
402         unsigned int ireg;
403         int handled = 0;
404 
405         ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK);
406 
407         if (ireg) {
408                 unsigned stat = readl(host->base + MMC_STAT);
409 
410                 pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat);
411 
412                 if (ireg & END_CMD_RES)
413                         handled |= pxamci_cmd_done(host, stat);
414                 if (ireg & DATA_TRAN_DONE)
415                         handled |= pxamci_data_done(host, stat);
416                 if (ireg & SDIO_INT) {
417                         mmc_signal_sdio_irq(host->mmc);
418                         handled = 1;
419                 }
420         }
421 
422         return IRQ_RETVAL(handled);
423 }
424 
425 static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
426 {
427         struct pxamci_host *host = mmc_priv(mmc);
428         unsigned int cmdat;
429 
430         WARN_ON(host->mrq != NULL);
431 
432         host->mrq = mrq;
433 
434         pxamci_stop_clock(host);
435 
436         cmdat = host->cmdat;
437         host->cmdat &= ~CMDAT_INIT;
438 
439         if (mrq->data) {
440                 pxamci_setup_data(host, mrq->data);
441 
442                 cmdat &= ~CMDAT_BUSY;
443                 cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
444                 if (mrq->data->flags & MMC_DATA_WRITE)
445                         cmdat |= CMDAT_WRITE;
446 
447                 if (mrq->data->flags & MMC_DATA_STREAM)
448                         cmdat |= CMDAT_STREAM;
449         }
450 
451         pxamci_start_cmd(host, mrq->cmd, cmdat);
452 }
453 
454 static int pxamci_get_ro(struct mmc_host *mmc)
455 {
456         struct pxamci_host *host = mmc_priv(mmc);
457 
458         if (host->pdata && gpio_is_valid(host->pdata->gpio_card_ro))
459                 return mmc_gpio_get_ro(mmc);
460         if (host->pdata && host->pdata->get_ro)
461                 return !!host->pdata->get_ro(mmc_dev(mmc));
462         /*
463          * Board doesn't support read only detection; let the mmc core
464          * decide what to do.
465          */
466         return -ENOSYS;
467 }
468 
469 static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
470 {
471         struct pxamci_host *host = mmc_priv(mmc);
472 
473         if (ios->clock) {
474                 unsigned long rate = host->clkrate;
475                 unsigned int clk = rate / ios->clock;
476 
477                 if (host->clkrt == CLKRT_OFF)
478                         clk_prepare_enable(host->clk);
479 
480                 if (ios->clock == 26000000) {
481                         /* to support 26MHz */
482                         host->clkrt = 7;
483                 } else {
484                         /* to handle (19.5MHz, 26MHz) */
485                         if (!clk)
486                                 clk = 1;
487 
488                         /*
489                          * clk might result in a lower divisor than we
490                          * desire.  check for that condition and adjust
491                          * as appropriate.
492                          */
493                         if (rate / clk > ios->clock)
494                                 clk <<= 1;
495                         host->clkrt = fls(clk) - 1;
496                 }
497 
498                 /*
499                  * we write clkrt on the next command
500                  */
501         } else {
502                 pxamci_stop_clock(host);
503                 if (host->clkrt != CLKRT_OFF) {
504                         host->clkrt = CLKRT_OFF;
505                         clk_disable_unprepare(host->clk);
506                 }
507         }
508 
509         if (host->power_mode != ios->power_mode) {
510                 int ret;
511 
512                 host->power_mode = ios->power_mode;
513 
514                 ret = pxamci_set_power(host, ios->power_mode, ios->vdd);
515                 if (ret) {
516                         dev_err(mmc_dev(mmc), "unable to set power\n");
517                         /*
518                          * The .set_ios() function in the mmc_host_ops
519                          * struct return void, and failing to set the
520                          * power should be rare so we print an error and
521                          * return here.
522                          */
523                         return;
524                 }
525 
526                 if (ios->power_mode == MMC_POWER_ON)
527                         host->cmdat |= CMDAT_INIT;
528         }
529 
530         if (ios->bus_width == MMC_BUS_WIDTH_4)
531                 host->cmdat |= CMDAT_SD_4DAT;
532         else
533                 host->cmdat &= ~CMDAT_SD_4DAT;
534 
535         dev_dbg(mmc_dev(mmc), "PXAMCI: clkrt = %x cmdat = %x\n",
536                 host->clkrt, host->cmdat);
537 }
538 
539 static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
540 {
541         struct pxamci_host *pxa_host = mmc_priv(host);
542 
543         if (enable)
544                 pxamci_enable_irq(pxa_host, SDIO_INT);
545         else
546                 pxamci_disable_irq(pxa_host, SDIO_INT);
547 }
548 
549 static const struct mmc_host_ops pxamci_ops = {
550         .request                = pxamci_request,
551         .get_cd                 = mmc_gpio_get_cd,
552         .get_ro                 = pxamci_get_ro,
553         .set_ios                = pxamci_set_ios,
554         .enable_sdio_irq        = pxamci_enable_sdio_irq,
555 };
556 
557 static void pxamci_dma_irq(void *param)
558 {
559         struct pxamci_host *host = param;
560         struct dma_tx_state state;
561         enum dma_status status;
562         struct dma_chan *chan;
563         unsigned long flags;
564 
565         spin_lock_irqsave(&host->lock, flags);
566 
567         if (!host->data)
568                 goto out_unlock;
569 
570         if (host->data->flags & MMC_DATA_READ)
571                 chan = host->dma_chan_rx;
572         else
573                 chan = host->dma_chan_tx;
574 
575         status = dmaengine_tx_status(chan, host->dma_cookie, &state);
576 
577         if (likely(status == DMA_COMPLETE)) {
578                 writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
579         } else {
580                 pr_err("%s: DMA error on %s channel\n", mmc_hostname(host->mmc),
581                         host->data->flags & MMC_DATA_READ ? "rx" : "tx");
582                 host->data->error = -EIO;
583                 pxamci_data_done(host, 0);
584         }
585 
586 out_unlock:
587         spin_unlock_irqrestore(&host->lock, flags);
588 }
589 
590 static irqreturn_t pxamci_detect_irq(int irq, void *devid)
591 {
592         struct pxamci_host *host = mmc_priv(devid);
593 
594         mmc_detect_change(devid, msecs_to_jiffies(host->pdata->detect_delay_ms));
595         return IRQ_HANDLED;
596 }
597 
598 #ifdef CONFIG_OF
599 static const struct of_device_id pxa_mmc_dt_ids[] = {
600         { .compatible = "marvell,pxa-mmc" },
601         { }
602 };
603 
604 MODULE_DEVICE_TABLE(of, pxa_mmc_dt_ids);
605 
606 static int pxamci_of_init(struct platform_device *pdev)
607 {
608         struct device_node *np = pdev->dev.of_node;
609         struct pxamci_platform_data *pdata;
610         u32 tmp;
611 
612         if (!np)
613                 return 0;
614 
615         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
616         if (!pdata)
617                 return -ENOMEM;
618 
619         pdata->gpio_card_detect =
620                 of_get_named_gpio(np, "cd-gpios", 0);
621         pdata->gpio_card_ro =
622                 of_get_named_gpio(np, "wp-gpios", 0);
623 
624         /* pxa-mmc specific */
625         pdata->gpio_power =
626                 of_get_named_gpio(np, "pxa-mmc,gpio-power", 0);
627 
628         if (of_property_read_u32(np, "pxa-mmc,detect-delay-ms", &tmp) == 0)
629                 pdata->detect_delay_ms = tmp;
630 
631         pdev->dev.platform_data = pdata;
632 
633         return 0;
634 }
635 #else
636 static int pxamci_of_init(struct platform_device *pdev)
637 {
638         return 0;
639 }
640 #endif
641 
642 static int pxamci_probe(struct platform_device *pdev)
643 {
644         struct mmc_host *mmc;
645         struct pxamci_host *host = NULL;
646         struct resource *r, *dmarx, *dmatx;
647         struct pxad_param param_rx, param_tx;
648         int ret, irq, gpio_cd = -1, gpio_ro = -1, gpio_power = -1;
649         dma_cap_mask_t mask;
650 
651         ret = pxamci_of_init(pdev);
652         if (ret)
653                 return ret;
654 
655         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
656         irq = platform_get_irq(pdev, 0);
657         if (irq < 0)
658                 return irq;
659 
660         mmc = mmc_alloc_host(sizeof(struct pxamci_host), &pdev->dev);
661         if (!mmc) {
662                 ret = -ENOMEM;
663                 goto out;
664         }
665 
666         mmc->ops = &pxamci_ops;
667 
668         /*
669          * We can do SG-DMA, but we don't because we never know how much
670          * data we successfully wrote to the card.
671          */
672         mmc->max_segs = NR_SG;
673 
674         /*
675          * Our hardware DMA can handle a maximum of one page per SG entry.
676          */
677         mmc->max_seg_size = PAGE_SIZE;
678 
679         /*
680          * Block length register is only 10 bits before PXA27x.
681          */
682         mmc->max_blk_size = cpu_is_pxa25x() ? 1023 : 2048;
683 
684         /*
685          * Block count register is 16 bits.
686          */
687         mmc->max_blk_count = 65535;
688 
689         host = mmc_priv(mmc);
690         host->mmc = mmc;
691         host->pdata = pdev->dev.platform_data;
692         host->clkrt = CLKRT_OFF;
693 
694         host->clk = devm_clk_get(&pdev->dev, NULL);
695         if (IS_ERR(host->clk)) {
696                 ret = PTR_ERR(host->clk);
697                 host->clk = NULL;
698                 goto out;
699         }
700 
701         host->clkrate = clk_get_rate(host->clk);
702 
703         /*
704          * Calculate minimum clock rate, rounding up.
705          */
706         mmc->f_min = (host->clkrate + 63) / 64;
707         mmc->f_max = (mmc_has_26MHz()) ? 26000000 : host->clkrate;
708 
709         pxamci_init_ocr(host);
710 
711         mmc->caps = 0;
712         host->cmdat = 0;
713         if (!cpu_is_pxa25x()) {
714                 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
715                 host->cmdat |= CMDAT_SDIO_INT_EN;
716                 if (mmc_has_26MHz())
717                         mmc->caps |= MMC_CAP_MMC_HIGHSPEED |
718                                      MMC_CAP_SD_HIGHSPEED;
719         }
720 
721         spin_lock_init(&host->lock);
722         host->res = r;
723         host->irq = irq;
724         host->imask = MMC_I_MASK_ALL;
725 
726         host->base = devm_ioremap_resource(&pdev->dev, r);
727         if (IS_ERR(host->base)) {
728                 ret = PTR_ERR(host->base);
729                 goto out;
730         }
731 
732         /*
733          * Ensure that the host controller is shut down, and setup
734          * with our defaults.
735          */
736         pxamci_stop_clock(host);
737         writel(0, host->base + MMC_SPI);
738         writel(64, host->base + MMC_RESTO);
739         writel(host->imask, host->base + MMC_I_MASK);
740 
741         ret = devm_request_irq(&pdev->dev, host->irq, pxamci_irq, 0,
742                                DRIVER_NAME, host);
743         if (ret)
744                 goto out;
745 
746         platform_set_drvdata(pdev, mmc);
747 
748         if (!pdev->dev.of_node) {
749                 dmarx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
750                 dmatx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
751                 if (!dmarx || !dmatx) {
752                         ret = -ENXIO;
753                         goto out;
754                 }
755                 param_rx.prio = PXAD_PRIO_LOWEST;
756                 param_rx.drcmr = dmarx->start;
757                 param_tx.prio = PXAD_PRIO_LOWEST;
758                 param_tx.drcmr = dmatx->start;
759         }
760 
761         dma_cap_zero(mask);
762         dma_cap_set(DMA_SLAVE, mask);
763 
764         host->dma_chan_rx =
765                 dma_request_slave_channel_compat(mask, pxad_filter_fn,
766                                                  &param_rx, &pdev->dev, "rx");
767         if (host->dma_chan_rx == NULL) {
768                 dev_err(&pdev->dev, "unable to request rx dma channel\n");
769                 ret = -ENODEV;
770                 goto out;
771         }
772 
773         host->dma_chan_tx =
774                 dma_request_slave_channel_compat(mask, pxad_filter_fn,
775                                                  &param_tx,  &pdev->dev, "tx");
776         if (host->dma_chan_tx == NULL) {
777                 dev_err(&pdev->dev, "unable to request tx dma channel\n");
778                 ret = -ENODEV;
779                 goto out;
780         }
781 
782         if (host->pdata) {
783                 gpio_cd = host->pdata->gpio_card_detect;
784                 gpio_ro = host->pdata->gpio_card_ro;
785                 gpio_power = host->pdata->gpio_power;
786         }
787         if (gpio_is_valid(gpio_power)) {
788                 ret = devm_gpio_request(&pdev->dev, gpio_power,
789                                         "mmc card power");
790                 if (ret) {
791                         dev_err(&pdev->dev, "Failed requesting gpio_power %d\n",
792                                 gpio_power);
793                         goto out;
794                 }
795                 gpio_direction_output(gpio_power,
796                                       host->pdata->gpio_power_invert);
797         }
798         if (gpio_is_valid(gpio_ro))
799                 ret = mmc_gpio_request_ro(mmc, gpio_ro);
800         if (ret) {
801                 dev_err(&pdev->dev, "Failed requesting gpio_ro %d\n", gpio_ro);
802                 goto out;
803         } else {
804                 mmc->caps2 |= host->pdata->gpio_card_ro_invert ?
805                         0 : MMC_CAP2_RO_ACTIVE_HIGH;
806         }
807 
808         if (gpio_is_valid(gpio_cd))
809                 ret = mmc_gpio_request_cd(mmc, gpio_cd, 0);
810         if (ret) {
811                 dev_err(&pdev->dev, "Failed requesting gpio_cd %d\n", gpio_cd);
812                 goto out;
813         }
814 
815         if (host->pdata && host->pdata->init)
816                 host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc);
817 
818         if (gpio_is_valid(gpio_power) && host->pdata->setpower)
819                 dev_warn(&pdev->dev, "gpio_power and setpower() both defined\n");
820         if (gpio_is_valid(gpio_ro) && host->pdata->get_ro)
821                 dev_warn(&pdev->dev, "gpio_ro and get_ro() both defined\n");
822 
823         mmc_add_host(mmc);
824 
825         return 0;
826 
827 out:
828         if (host) {
829                 if (host->dma_chan_rx)
830                         dma_release_channel(host->dma_chan_rx);
831                 if (host->dma_chan_tx)
832                         dma_release_channel(host->dma_chan_tx);
833         }
834         if (mmc)
835                 mmc_free_host(mmc);
836         return ret;
837 }
838 
839 static int pxamci_remove(struct platform_device *pdev)
840 {
841         struct mmc_host *mmc = platform_get_drvdata(pdev);
842         int gpio_cd = -1, gpio_ro = -1, gpio_power = -1;
843 
844         if (mmc) {
845                 struct pxamci_host *host = mmc_priv(mmc);
846 
847                 mmc_remove_host(mmc);
848 
849                 if (host->pdata) {
850                         gpio_cd = host->pdata->gpio_card_detect;
851                         gpio_ro = host->pdata->gpio_card_ro;
852                         gpio_power = host->pdata->gpio_power;
853                 }
854                 if (host->pdata && host->pdata->exit)
855                         host->pdata->exit(&pdev->dev, mmc);
856 
857                 pxamci_stop_clock(host);
858                 writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
859                        END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
860                        host->base + MMC_I_MASK);
861 
862                 dmaengine_terminate_all(host->dma_chan_rx);
863                 dmaengine_terminate_all(host->dma_chan_tx);
864                 dma_release_channel(host->dma_chan_rx);
865                 dma_release_channel(host->dma_chan_tx);
866 
867                 mmc_free_host(mmc);
868         }
869         return 0;
870 }
871 
872 static struct platform_driver pxamci_driver = {
873         .probe          = pxamci_probe,
874         .remove         = pxamci_remove,
875         .driver         = {
876                 .name   = DRIVER_NAME,
877                 .of_match_table = of_match_ptr(pxa_mmc_dt_ids),
878         },
879 };
880 
881 module_platform_driver(pxamci_driver);
882 
883 MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
884 MODULE_LICENSE("GPL");
885 MODULE_ALIAS("platform:pxa2xx-mci");
886 

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