Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/mmc/host/s3cmci.c

  1 /*
  2  *  linux/drivers/mmc/s3cmci.h - Samsung S3C MCI driver
  3  *
  4  *  Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk@maintech.de>
  5  *
  6  * Current driver maintained by Ben Dooks and Simtec Electronics
  7  *  Copyright (C) 2008 Simtec Electronics <ben-linux@fluff.org>
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/dma-mapping.h>
 16 #include <linux/clk.h>
 17 #include <linux/mmc/host.h>
 18 #include <linux/platform_device.h>
 19 #include <linux/cpufreq.h>
 20 #include <linux/debugfs.h>
 21 #include <linux/seq_file.h>
 22 #include <linux/gpio.h>
 23 #include <linux/irq.h>
 24 #include <linux/io.h>
 25 
 26 #include <plat/gpio-cfg.h>
 27 #include <mach/dma.h>
 28 #include <mach/gpio-samsung.h>
 29 
 30 #include <linux/platform_data/mmc-s3cmci.h>
 31 
 32 #include "s3cmci.h"
 33 
 34 #define DRIVER_NAME "s3c-mci"
 35 
 36 #define S3C2410_SDICON                  (0x00)
 37 #define S3C2410_SDIPRE                  (0x04)
 38 #define S3C2410_SDICMDARG               (0x08)
 39 #define S3C2410_SDICMDCON               (0x0C)
 40 #define S3C2410_SDICMDSTAT              (0x10)
 41 #define S3C2410_SDIRSP0                 (0x14)
 42 #define S3C2410_SDIRSP1                 (0x18)
 43 #define S3C2410_SDIRSP2                 (0x1C)
 44 #define S3C2410_SDIRSP3                 (0x20)
 45 #define S3C2410_SDITIMER                (0x24)
 46 #define S3C2410_SDIBSIZE                (0x28)
 47 #define S3C2410_SDIDCON                 (0x2C)
 48 #define S3C2410_SDIDCNT                 (0x30)
 49 #define S3C2410_SDIDSTA                 (0x34)
 50 #define S3C2410_SDIFSTA                 (0x38)
 51 
 52 #define S3C2410_SDIDATA                 (0x3C)
 53 #define S3C2410_SDIIMSK                 (0x40)
 54 
 55 #define S3C2440_SDIDATA                 (0x40)
 56 #define S3C2440_SDIIMSK                 (0x3C)
 57 
 58 #define S3C2440_SDICON_SDRESET          (1 << 8)
 59 #define S3C2410_SDICON_SDIOIRQ          (1 << 3)
 60 #define S3C2410_SDICON_FIFORESET        (1 << 1)
 61 #define S3C2410_SDICON_CLOCKTYPE        (1 << 0)
 62 
 63 #define S3C2410_SDICMDCON_LONGRSP       (1 << 10)
 64 #define S3C2410_SDICMDCON_WAITRSP       (1 << 9)
 65 #define S3C2410_SDICMDCON_CMDSTART      (1 << 8)
 66 #define S3C2410_SDICMDCON_SENDERHOST    (1 << 6)
 67 #define S3C2410_SDICMDCON_INDEX         (0x3f)
 68 
 69 #define S3C2410_SDICMDSTAT_CRCFAIL      (1 << 12)
 70 #define S3C2410_SDICMDSTAT_CMDSENT      (1 << 11)
 71 #define S3C2410_SDICMDSTAT_CMDTIMEOUT   (1 << 10)
 72 #define S3C2410_SDICMDSTAT_RSPFIN       (1 << 9)
 73 
 74 #define S3C2440_SDIDCON_DS_WORD         (2 << 22)
 75 #define S3C2410_SDIDCON_TXAFTERRESP     (1 << 20)
 76 #define S3C2410_SDIDCON_RXAFTERCMD      (1 << 19)
 77 #define S3C2410_SDIDCON_BLOCKMODE       (1 << 17)
 78 #define S3C2410_SDIDCON_WIDEBUS         (1 << 16)
 79 #define S3C2410_SDIDCON_DMAEN           (1 << 15)
 80 #define S3C2410_SDIDCON_STOP            (1 << 14)
 81 #define S3C2440_SDIDCON_DATSTART        (1 << 14)
 82 
 83 #define S3C2410_SDIDCON_XFER_RXSTART    (2 << 12)
 84 #define S3C2410_SDIDCON_XFER_TXSTART    (3 << 12)
 85 
 86 #define S3C2410_SDIDCON_BLKNUM_MASK     (0xFFF)
 87 
 88 #define S3C2410_SDIDSTA_SDIOIRQDETECT   (1 << 9)
 89 #define S3C2410_SDIDSTA_FIFOFAIL        (1 << 8)
 90 #define S3C2410_SDIDSTA_CRCFAIL         (1 << 7)
 91 #define S3C2410_SDIDSTA_RXCRCFAIL       (1 << 6)
 92 #define S3C2410_SDIDSTA_DATATIMEOUT     (1 << 5)
 93 #define S3C2410_SDIDSTA_XFERFINISH      (1 << 4)
 94 #define S3C2410_SDIDSTA_TXDATAON        (1 << 1)
 95 #define S3C2410_SDIDSTA_RXDATAON        (1 << 0)
 96 
 97 #define S3C2440_SDIFSTA_FIFORESET       (1 << 16)
 98 #define S3C2440_SDIFSTA_FIFOFAIL        (3 << 14)
 99 #define S3C2410_SDIFSTA_TFDET           (1 << 13)
100 #define S3C2410_SDIFSTA_RFDET           (1 << 12)
101 #define S3C2410_SDIFSTA_COUNTMASK       (0x7f)
102 
103 #define S3C2410_SDIIMSK_RESPONSECRC     (1 << 17)
104 #define S3C2410_SDIIMSK_CMDSENT         (1 << 16)
105 #define S3C2410_SDIIMSK_CMDTIMEOUT      (1 << 15)
106 #define S3C2410_SDIIMSK_RESPONSEND      (1 << 14)
107 #define S3C2410_SDIIMSK_SDIOIRQ         (1 << 12)
108 #define S3C2410_SDIIMSK_FIFOFAIL        (1 << 11)
109 #define S3C2410_SDIIMSK_CRCSTATUS       (1 << 10)
110 #define S3C2410_SDIIMSK_DATACRC         (1 << 9)
111 #define S3C2410_SDIIMSK_DATATIMEOUT     (1 << 8)
112 #define S3C2410_SDIIMSK_DATAFINISH      (1 << 7)
113 #define S3C2410_SDIIMSK_TXFIFOHALF      (1 << 4)
114 #define S3C2410_SDIIMSK_RXFIFOLAST      (1 << 2)
115 #define S3C2410_SDIIMSK_RXFIFOHALF      (1 << 0)
116 
117 enum dbg_channels {
118         dbg_err   = (1 << 0),
119         dbg_debug = (1 << 1),
120         dbg_info  = (1 << 2),
121         dbg_irq   = (1 << 3),
122         dbg_sg    = (1 << 4),
123         dbg_dma   = (1 << 5),
124         dbg_pio   = (1 << 6),
125         dbg_fail  = (1 << 7),
126         dbg_conf  = (1 << 8),
127 };
128 
129 static const int dbgmap_err   = dbg_fail;
130 static const int dbgmap_info  = dbg_info | dbg_conf;
131 static const int dbgmap_debug = dbg_err | dbg_debug;
132 
133 #define dbg(host, channels, args...)              \
134         do {                                      \
135         if (dbgmap_err & channels)                \
136                 dev_err(&host->pdev->dev, args);  \
137         else if (dbgmap_info & channels)          \
138                 dev_info(&host->pdev->dev, args); \
139         else if (dbgmap_debug & channels)         \
140                 dev_dbg(&host->pdev->dev, args);  \
141         } while (0)
142 
143 static struct s3c2410_dma_client s3cmci_dma_client = {
144         .name           = "s3c-mci",
145 };
146 
147 static void finalize_request(struct s3cmci_host *host);
148 static void s3cmci_send_request(struct mmc_host *mmc);
149 static void s3cmci_reset(struct s3cmci_host *host);
150 
151 #ifdef CONFIG_MMC_DEBUG
152 
153 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix)
154 {
155         u32 con, pre, cmdarg, cmdcon, cmdsta, r0, r1, r2, r3, timer, bsize;
156         u32 datcon, datcnt, datsta, fsta, imask;
157 
158         con     = readl(host->base + S3C2410_SDICON);
159         pre     = readl(host->base + S3C2410_SDIPRE);
160         cmdarg  = readl(host->base + S3C2410_SDICMDARG);
161         cmdcon  = readl(host->base + S3C2410_SDICMDCON);
162         cmdsta  = readl(host->base + S3C2410_SDICMDSTAT);
163         r0      = readl(host->base + S3C2410_SDIRSP0);
164         r1      = readl(host->base + S3C2410_SDIRSP1);
165         r2      = readl(host->base + S3C2410_SDIRSP2);
166         r3      = readl(host->base + S3C2410_SDIRSP3);
167         timer   = readl(host->base + S3C2410_SDITIMER);
168         bsize   = readl(host->base + S3C2410_SDIBSIZE);
169         datcon  = readl(host->base + S3C2410_SDIDCON);
170         datcnt  = readl(host->base + S3C2410_SDIDCNT);
171         datsta  = readl(host->base + S3C2410_SDIDSTA);
172         fsta    = readl(host->base + S3C2410_SDIFSTA);
173         imask   = readl(host->base + host->sdiimsk);
174 
175         dbg(host, dbg_debug, "%s  CON:[%08x]  PRE:[%08x]  TMR:[%08x]\n",
176                                 prefix, con, pre, timer);
177 
178         dbg(host, dbg_debug, "%s CCON:[%08x] CARG:[%08x] CSTA:[%08x]\n",
179                                 prefix, cmdcon, cmdarg, cmdsta);
180 
181         dbg(host, dbg_debug, "%s DCON:[%08x] FSTA:[%08x]"
182                                " DSTA:[%08x] DCNT:[%08x]\n",
183                                 prefix, datcon, fsta, datsta, datcnt);
184 
185         dbg(host, dbg_debug, "%s   R0:[%08x]   R1:[%08x]"
186                                "   R2:[%08x]   R3:[%08x]\n",
187                                 prefix, r0, r1, r2, r3);
188 }
189 
190 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
191                            int stop)
192 {
193         snprintf(host->dbgmsg_cmd, 300,
194                  "#%u%s op:%i arg:0x%08x flags:0x08%x retries:%u",
195                  host->ccnt, (stop ? " (STOP)" : ""),
196                  cmd->opcode, cmd->arg, cmd->flags, cmd->retries);
197 
198         if (cmd->data) {
199                 snprintf(host->dbgmsg_dat, 300,
200                          "#%u bsize:%u blocks:%u bytes:%u",
201                          host->dcnt, cmd->data->blksz,
202                          cmd->data->blocks,
203                          cmd->data->blocks * cmd->data->blksz);
204         } else {
205                 host->dbgmsg_dat[0] = '\0';
206         }
207 }
208 
209 static void dbg_dumpcmd(struct s3cmci_host *host, struct mmc_command *cmd,
210                         int fail)
211 {
212         unsigned int dbglvl = fail ? dbg_fail : dbg_debug;
213 
214         if (!cmd)
215                 return;
216 
217         if (cmd->error == 0) {
218                 dbg(host, dbglvl, "CMD[OK] %s R0:0x%08x\n",
219                         host->dbgmsg_cmd, cmd->resp[0]);
220         } else {
221                 dbg(host, dbglvl, "CMD[ERR %i] %s Status:%s\n",
222                         cmd->error, host->dbgmsg_cmd, host->status);
223         }
224 
225         if (!cmd->data)
226                 return;
227 
228         if (cmd->data->error == 0) {
229                 dbg(host, dbglvl, "DAT[OK] %s\n", host->dbgmsg_dat);
230         } else {
231                 dbg(host, dbglvl, "DAT[ERR %i] %s DCNT:0x%08x\n",
232                         cmd->data->error, host->dbgmsg_dat,
233                         readl(host->base + S3C2410_SDIDCNT));
234         }
235 }
236 #else
237 static void dbg_dumpcmd(struct s3cmci_host *host,
238                         struct mmc_command *cmd, int fail) { }
239 
240 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
241                            int stop) { }
242 
243 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix) { }
244 
245 #endif /* CONFIG_MMC_DEBUG */
246 
247 /**
248  * s3cmci_host_usedma - return whether the host is using dma or pio
249  * @host: The host state
250  *
251  * Return true if the host is using DMA to transfer data, else false
252  * to use PIO mode. Will return static data depending on the driver
253  * configuration.
254  */
255 static inline bool s3cmci_host_usedma(struct s3cmci_host *host)
256 {
257 #ifdef CONFIG_MMC_S3C_PIO
258         return false;
259 #elif defined(CONFIG_MMC_S3C_DMA)
260         return true;
261 #else
262         return host->dodma;
263 #endif
264 }
265 
266 /**
267  * s3cmci_host_canpio - return true if host has pio code available
268  *
269  * Return true if the driver has been compiled with the PIO support code
270  * available.
271  */
272 static inline bool s3cmci_host_canpio(void)
273 {
274 #ifdef CONFIG_MMC_S3C_PIO
275         return true;
276 #else
277         return false;
278 #endif
279 }
280 
281 static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
282 {
283         u32 newmask;
284 
285         newmask = readl(host->base + host->sdiimsk);
286         newmask |= imask;
287 
288         writel(newmask, host->base + host->sdiimsk);
289 
290         return newmask;
291 }
292 
293 static inline u32 disable_imask(struct s3cmci_host *host, u32 imask)
294 {
295         u32 newmask;
296 
297         newmask = readl(host->base + host->sdiimsk);
298         newmask &= ~imask;
299 
300         writel(newmask, host->base + host->sdiimsk);
301 
302         return newmask;
303 }
304 
305 static inline void clear_imask(struct s3cmci_host *host)
306 {
307         u32 mask = readl(host->base + host->sdiimsk);
308 
309         /* preserve the SDIO IRQ mask state */
310         mask &= S3C2410_SDIIMSK_SDIOIRQ;
311         writel(mask, host->base + host->sdiimsk);
312 }
313 
314 /**
315  * s3cmci_check_sdio_irq - test whether the SDIO IRQ is being signalled
316  * @host: The host to check.
317  *
318  * Test to see if the SDIO interrupt is being signalled in case the
319  * controller has failed to re-detect a card interrupt. Read GPE8 and
320  * see if it is low and if so, signal a SDIO interrupt.
321  *
322  * This is currently called if a request is finished (we assume that the
323  * bus is now idle) and when the SDIO IRQ is enabled in case the IRQ is
324  * already being indicated.
325 */
326 static void s3cmci_check_sdio_irq(struct s3cmci_host *host)
327 {
328         if (host->sdio_irqen) {
329                 if (gpio_get_value(S3C2410_GPE(8)) == 0) {
330                         pr_debug("%s: signalling irq\n", __func__);
331                         mmc_signal_sdio_irq(host->mmc);
332                 }
333         }
334 }
335 
336 static inline int get_data_buffer(struct s3cmci_host *host,
337                                   u32 *bytes, u32 **pointer)
338 {
339         struct scatterlist *sg;
340 
341         if (host->pio_active == XFER_NONE)
342                 return -EINVAL;
343 
344         if ((!host->mrq) || (!host->mrq->data))
345                 return -EINVAL;
346 
347         if (host->pio_sgptr >= host->mrq->data->sg_len) {
348                 dbg(host, dbg_debug, "no more buffers (%i/%i)\n",
349                       host->pio_sgptr, host->mrq->data->sg_len);
350                 return -EBUSY;
351         }
352         sg = &host->mrq->data->sg[host->pio_sgptr];
353 
354         *bytes = sg->length;
355         *pointer = sg_virt(sg);
356 
357         host->pio_sgptr++;
358 
359         dbg(host, dbg_sg, "new buffer (%i/%i)\n",
360             host->pio_sgptr, host->mrq->data->sg_len);
361 
362         return 0;
363 }
364 
365 static inline u32 fifo_count(struct s3cmci_host *host)
366 {
367         u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
368 
369         fifostat &= S3C2410_SDIFSTA_COUNTMASK;
370         return fifostat;
371 }
372 
373 static inline u32 fifo_free(struct s3cmci_host *host)
374 {
375         u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
376 
377         fifostat &= S3C2410_SDIFSTA_COUNTMASK;
378         return 63 - fifostat;
379 }
380 
381 /**
382  * s3cmci_enable_irq - enable IRQ, after having disabled it.
383  * @host: The device state.
384  * @more: True if more IRQs are expected from transfer.
385  *
386  * Enable the main IRQ if needed after it has been disabled.
387  *
388  * The IRQ can be one of the following states:
389  *      - disabled during IDLE
390  *      - disabled whilst processing data
391  *      - enabled during transfer
392  *      - enabled whilst awaiting SDIO interrupt detection
393  */
394 static void s3cmci_enable_irq(struct s3cmci_host *host, bool more)
395 {
396         unsigned long flags;
397         bool enable = false;
398 
399         local_irq_save(flags);
400 
401         host->irq_enabled = more;
402         host->irq_disabled = false;
403 
404         enable = more | host->sdio_irqen;
405 
406         if (host->irq_state != enable) {
407                 host->irq_state = enable;
408 
409                 if (enable)
410                         enable_irq(host->irq);
411                 else
412                         disable_irq(host->irq);
413         }
414 
415         local_irq_restore(flags);
416 }
417 
418 /**
419  *
420  */
421 static void s3cmci_disable_irq(struct s3cmci_host *host, bool transfer)
422 {
423         unsigned long flags;
424 
425         local_irq_save(flags);
426 
427         /* pr_debug("%s: transfer %d\n", __func__, transfer); */
428 
429         host->irq_disabled = transfer;
430 
431         if (transfer && host->irq_state) {
432                 host->irq_state = false;
433                 disable_irq(host->irq);
434         }
435 
436         local_irq_restore(flags);
437 }
438 
439 static void do_pio_read(struct s3cmci_host *host)
440 {
441         int res;
442         u32 fifo;
443         u32 *ptr;
444         u32 fifo_words;
445         void __iomem *from_ptr;
446 
447         /* write real prescaler to host, it might be set slow to fix */
448         writel(host->prescaler, host->base + S3C2410_SDIPRE);
449 
450         from_ptr = host->base + host->sdidata;
451 
452         while ((fifo = fifo_count(host))) {
453                 if (!host->pio_bytes) {
454                         res = get_data_buffer(host, &host->pio_bytes,
455                                               &host->pio_ptr);
456                         if (res) {
457                                 host->pio_active = XFER_NONE;
458                                 host->complete_what = COMPLETION_FINALIZE;
459 
460                                 dbg(host, dbg_pio, "pio_read(): "
461                                     "complete (no more data).\n");
462                                 return;
463                         }
464 
465                         dbg(host, dbg_pio,
466                             "pio_read(): new target: [%i]@[%p]\n",
467                             host->pio_bytes, host->pio_ptr);
468                 }
469 
470                 dbg(host, dbg_pio,
471                     "pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
472                     fifo, host->pio_bytes,
473                     readl(host->base + S3C2410_SDIDCNT));
474 
475                 /* If we have reached the end of the block, we can
476                  * read a word and get 1 to 3 bytes.  If we in the
477                  * middle of the block, we have to read full words,
478                  * otherwise we will write garbage, so round down to
479                  * an even multiple of 4. */
480                 if (fifo >= host->pio_bytes)
481                         fifo = host->pio_bytes;
482                 else
483                         fifo -= fifo & 3;
484 
485                 host->pio_bytes -= fifo;
486                 host->pio_count += fifo;
487 
488                 fifo_words = fifo >> 2;
489                 ptr = host->pio_ptr;
490                 while (fifo_words--)
491                         *ptr++ = readl(from_ptr);
492                 host->pio_ptr = ptr;
493 
494                 if (fifo & 3) {
495                         u32 n = fifo & 3;
496                         u32 data = readl(from_ptr);
497                         u8 *p = (u8 *)host->pio_ptr;
498 
499                         while (n--) {
500                                 *p++ = data;
501                                 data >>= 8;
502                         }
503                 }
504         }
505 
506         if (!host->pio_bytes) {
507                 res = get_data_buffer(host, &host->pio_bytes, &host->pio_ptr);
508                 if (res) {
509                         dbg(host, dbg_pio,
510                             "pio_read(): complete (no more buffers).\n");
511                         host->pio_active = XFER_NONE;
512                         host->complete_what = COMPLETION_FINALIZE;
513 
514                         return;
515                 }
516         }
517 
518         enable_imask(host,
519                      S3C2410_SDIIMSK_RXFIFOHALF | S3C2410_SDIIMSK_RXFIFOLAST);
520 }
521 
522 static void do_pio_write(struct s3cmci_host *host)
523 {
524         void __iomem *to_ptr;
525         int res;
526         u32 fifo;
527         u32 *ptr;
528 
529         to_ptr = host->base + host->sdidata;
530 
531         while ((fifo = fifo_free(host)) > 3) {
532                 if (!host->pio_bytes) {
533                         res = get_data_buffer(host, &host->pio_bytes,
534                                                         &host->pio_ptr);
535                         if (res) {
536                                 dbg(host, dbg_pio,
537                                     "pio_write(): complete (no more data).\n");
538                                 host->pio_active = XFER_NONE;
539 
540                                 return;
541                         }
542 
543                         dbg(host, dbg_pio,
544                             "pio_write(): new source: [%i]@[%p]\n",
545                             host->pio_bytes, host->pio_ptr);
546 
547                 }
548 
549                 /* If we have reached the end of the block, we have to
550                  * write exactly the remaining number of bytes.  If we
551                  * in the middle of the block, we have to write full
552                  * words, so round down to an even multiple of 4. */
553                 if (fifo >= host->pio_bytes)
554                         fifo = host->pio_bytes;
555                 else
556                         fifo -= fifo & 3;
557 
558                 host->pio_bytes -= fifo;
559                 host->pio_count += fifo;
560 
561                 fifo = (fifo + 3) >> 2;
562                 ptr = host->pio_ptr;
563                 while (fifo--)
564                         writel(*ptr++, to_ptr);
565                 host->pio_ptr = ptr;
566         }
567 
568         enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
569 }
570 
571 static void pio_tasklet(unsigned long data)
572 {
573         struct s3cmci_host *host = (struct s3cmci_host *) data;
574 
575         s3cmci_disable_irq(host, true);
576 
577         if (host->pio_active == XFER_WRITE)
578                 do_pio_write(host);
579 
580         if (host->pio_active == XFER_READ)
581                 do_pio_read(host);
582 
583         if (host->complete_what == COMPLETION_FINALIZE) {
584                 clear_imask(host);
585                 if (host->pio_active != XFER_NONE) {
586                         dbg(host, dbg_err, "unfinished %s "
587                             "- pio_count:[%u] pio_bytes:[%u]\n",
588                             (host->pio_active == XFER_READ) ? "read" : "write",
589                             host->pio_count, host->pio_bytes);
590 
591                         if (host->mrq->data)
592                                 host->mrq->data->error = -EINVAL;
593                 }
594 
595                 s3cmci_enable_irq(host, false);
596                 finalize_request(host);
597         } else
598                 s3cmci_enable_irq(host, true);
599 }
600 
601 /*
602  * ISR for SDI Interface IRQ
603  * Communication between driver and ISR works as follows:
604  *   host->mrq                  points to current request
605  *   host->complete_what        Indicates when the request is considered done
606  *     COMPLETION_CMDSENT         when the command was sent
607  *     COMPLETION_RSPFIN          when a response was received
608  *     COMPLETION_XFERFINISH      when the data transfer is finished
609  *     COMPLETION_XFERFINISH_RSPFIN both of the above.
610  *   host->complete_request     is the completion-object the driver waits for
611  *
612  * 1) Driver sets up host->mrq and host->complete_what
613  * 2) Driver prepares the transfer
614  * 3) Driver enables interrupts
615  * 4) Driver starts transfer
616  * 5) Driver waits for host->complete_rquest
617  * 6) ISR checks for request status (errors and success)
618  * 6) ISR sets host->mrq->cmd->error and host->mrq->data->error
619  * 7) ISR completes host->complete_request
620  * 8) ISR disables interrupts
621  * 9) Driver wakes up and takes care of the request
622  *
623  * Note: "->error"-fields are expected to be set to 0 before the request
624  *       was issued by mmc.c - therefore they are only set, when an error
625  *       contition comes up
626  */
627 
628 static irqreturn_t s3cmci_irq(int irq, void *dev_id)
629 {
630         struct s3cmci_host *host = dev_id;
631         struct mmc_command *cmd;
632         u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
633         u32 mci_cclear = 0, mci_dclear;
634         unsigned long iflags;
635 
636         mci_dsta = readl(host->base + S3C2410_SDIDSTA);
637         mci_imsk = readl(host->base + host->sdiimsk);
638 
639         if (mci_dsta & S3C2410_SDIDSTA_SDIOIRQDETECT) {
640                 if (mci_imsk & S3C2410_SDIIMSK_SDIOIRQ) {
641                         mci_dclear = S3C2410_SDIDSTA_SDIOIRQDETECT;
642                         writel(mci_dclear, host->base + S3C2410_SDIDSTA);
643 
644                         mmc_signal_sdio_irq(host->mmc);
645                         return IRQ_HANDLED;
646                 }
647         }
648 
649         spin_lock_irqsave(&host->complete_lock, iflags);
650 
651         mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
652         mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
653         mci_fsta = readl(host->base + S3C2410_SDIFSTA);
654         mci_dclear = 0;
655 
656         if ((host->complete_what == COMPLETION_NONE) ||
657             (host->complete_what == COMPLETION_FINALIZE)) {
658                 host->status = "nothing to complete";
659                 clear_imask(host);
660                 goto irq_out;
661         }
662 
663         if (!host->mrq) {
664                 host->status = "no active mrq";
665                 clear_imask(host);
666                 goto irq_out;
667         }
668 
669         cmd = host->cmd_is_stop ? host->mrq->stop : host->mrq->cmd;
670 
671         if (!cmd) {
672                 host->status = "no active cmd";
673                 clear_imask(host);
674                 goto irq_out;
675         }
676 
677         if (!s3cmci_host_usedma(host)) {
678                 if ((host->pio_active == XFER_WRITE) &&
679                     (mci_fsta & S3C2410_SDIFSTA_TFDET)) {
680 
681                         disable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
682                         tasklet_schedule(&host->pio_tasklet);
683                         host->status = "pio tx";
684                 }
685 
686                 if ((host->pio_active == XFER_READ) &&
687                     (mci_fsta & S3C2410_SDIFSTA_RFDET)) {
688 
689                         disable_imask(host,
690                                       S3C2410_SDIIMSK_RXFIFOHALF |
691                                       S3C2410_SDIIMSK_RXFIFOLAST);
692 
693                         tasklet_schedule(&host->pio_tasklet);
694                         host->status = "pio rx";
695                 }
696         }
697 
698         if (mci_csta & S3C2410_SDICMDSTAT_CMDTIMEOUT) {
699                 dbg(host, dbg_err, "CMDSTAT: error CMDTIMEOUT\n");
700                 cmd->error = -ETIMEDOUT;
701                 host->status = "error: command timeout";
702                 goto fail_transfer;
703         }
704 
705         if (mci_csta & S3C2410_SDICMDSTAT_CMDSENT) {
706                 if (host->complete_what == COMPLETION_CMDSENT) {
707                         host->status = "ok: command sent";
708                         goto close_transfer;
709                 }
710 
711                 mci_cclear |= S3C2410_SDICMDSTAT_CMDSENT;
712         }
713 
714         if (mci_csta & S3C2410_SDICMDSTAT_CRCFAIL) {
715                 if (cmd->flags & MMC_RSP_CRC) {
716                         if (host->mrq->cmd->flags & MMC_RSP_136) {
717                                 dbg(host, dbg_irq,
718                                     "fixup: ignore CRC fail with long rsp\n");
719                         } else {
720                                 /* note, we used to fail the transfer
721                                  * here, but it seems that this is just
722                                  * the hardware getting it wrong.
723                                  *
724                                  * cmd->error = -EILSEQ;
725                                  * host->status = "error: bad command crc";
726                                  * goto fail_transfer;
727                                 */
728                         }
729                 }
730 
731                 mci_cclear |= S3C2410_SDICMDSTAT_CRCFAIL;
732         }
733 
734         if (mci_csta & S3C2410_SDICMDSTAT_RSPFIN) {
735                 if (host->complete_what == COMPLETION_RSPFIN) {
736                         host->status = "ok: command response received";
737                         goto close_transfer;
738                 }
739 
740                 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
741                         host->complete_what = COMPLETION_XFERFINISH;
742 
743                 mci_cclear |= S3C2410_SDICMDSTAT_RSPFIN;
744         }
745 
746         /* errors handled after this point are only relevant
747            when a data transfer is in progress */
748 
749         if (!cmd->data)
750                 goto clear_status_bits;
751 
752         /* Check for FIFO failure */
753         if (host->is2440) {
754                 if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
755                         dbg(host, dbg_err, "FIFO failure\n");
756                         host->mrq->data->error = -EILSEQ;
757                         host->status = "error: 2440 fifo failure";
758                         goto fail_transfer;
759                 }
760         } else {
761                 if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
762                         dbg(host, dbg_err, "FIFO failure\n");
763                         cmd->data->error = -EILSEQ;
764                         host->status = "error:  fifo failure";
765                         goto fail_transfer;
766                 }
767         }
768 
769         if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
770                 dbg(host, dbg_err, "bad data crc (outgoing)\n");
771                 cmd->data->error = -EILSEQ;
772                 host->status = "error: bad data crc (outgoing)";
773                 goto fail_transfer;
774         }
775 
776         if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
777                 dbg(host, dbg_err, "bad data crc (incoming)\n");
778                 cmd->data->error = -EILSEQ;
779                 host->status = "error: bad data crc (incoming)";
780                 goto fail_transfer;
781         }
782 
783         if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
784                 dbg(host, dbg_err, "data timeout\n");
785                 cmd->data->error = -ETIMEDOUT;
786                 host->status = "error: data timeout";
787                 goto fail_transfer;
788         }
789 
790         if (mci_dsta & S3C2410_SDIDSTA_XFERFINISH) {
791                 if (host->complete_what == COMPLETION_XFERFINISH) {
792                         host->status = "ok: data transfer completed";
793                         goto close_transfer;
794                 }
795 
796                 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
797                         host->complete_what = COMPLETION_RSPFIN;
798 
799                 mci_dclear |= S3C2410_SDIDSTA_XFERFINISH;
800         }
801 
802 clear_status_bits:
803         writel(mci_cclear, host->base + S3C2410_SDICMDSTAT);
804         writel(mci_dclear, host->base + S3C2410_SDIDSTA);
805 
806         goto irq_out;
807 
808 fail_transfer:
809         host->pio_active = XFER_NONE;
810 
811 close_transfer:
812         host->complete_what = COMPLETION_FINALIZE;
813 
814         clear_imask(host);
815         tasklet_schedule(&host->pio_tasklet);
816 
817         goto irq_out;
818 
819 irq_out:
820         dbg(host, dbg_irq,
821             "csta:0x%08x dsta:0x%08x fsta:0x%08x dcnt:0x%08x status:%s.\n",
822             mci_csta, mci_dsta, mci_fsta, mci_dcnt, host->status);
823 
824         spin_unlock_irqrestore(&host->complete_lock, iflags);
825         return IRQ_HANDLED;
826 
827 }
828 
829 /*
830  * ISR for the CardDetect Pin
831 */
832 
833 static irqreturn_t s3cmci_irq_cd(int irq, void *dev_id)
834 {
835         struct s3cmci_host *host = (struct s3cmci_host *)dev_id;
836 
837         dbg(host, dbg_irq, "card detect\n");
838 
839         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
840 
841         return IRQ_HANDLED;
842 }
843 
844 static void s3cmci_dma_done_callback(struct s3c2410_dma_chan *dma_ch,
845                                      void *buf_id, int size,
846                                      enum s3c2410_dma_buffresult result)
847 {
848         struct s3cmci_host *host = buf_id;
849         unsigned long iflags;
850         u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt;
851 
852         mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
853         mci_dsta = readl(host->base + S3C2410_SDIDSTA);
854         mci_fsta = readl(host->base + S3C2410_SDIFSTA);
855         mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
856 
857         BUG_ON(!host->mrq);
858         BUG_ON(!host->mrq->data);
859         BUG_ON(!host->dmatogo);
860 
861         spin_lock_irqsave(&host->complete_lock, iflags);
862 
863         if (result != S3C2410_RES_OK) {
864                 dbg(host, dbg_fail, "DMA FAILED: csta=0x%08x dsta=0x%08x "
865                         "fsta=0x%08x dcnt:0x%08x result:0x%08x toGo:%u\n",
866                         mci_csta, mci_dsta, mci_fsta,
867                         mci_dcnt, result, host->dmatogo);
868 
869                 goto fail_request;
870         }
871 
872         host->dmatogo--;
873         if (host->dmatogo) {
874                 dbg(host, dbg_dma, "DMA DONE  Size:%i DSTA:[%08x] "
875                         "DCNT:[%08x] toGo:%u\n",
876                         size, mci_dsta, mci_dcnt, host->dmatogo);
877 
878                 goto out;
879         }
880 
881         dbg(host, dbg_dma, "DMA FINISHED Size:%i DSTA:%08x DCNT:%08x\n",
882                 size, mci_dsta, mci_dcnt);
883 
884         host->dma_complete = 1;
885         host->complete_what = COMPLETION_FINALIZE;
886 
887 out:
888         tasklet_schedule(&host->pio_tasklet);
889         spin_unlock_irqrestore(&host->complete_lock, iflags);
890         return;
891 
892 fail_request:
893         host->mrq->data->error = -EINVAL;
894         host->complete_what = COMPLETION_FINALIZE;
895         clear_imask(host);
896 
897         goto out;
898 }
899 
900 static void finalize_request(struct s3cmci_host *host)
901 {
902         struct mmc_request *mrq = host->mrq;
903         struct mmc_command *cmd;
904         int debug_as_failure = 0;
905 
906         if (host->complete_what != COMPLETION_FINALIZE)
907                 return;
908 
909         if (!mrq)
910                 return;
911         cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
912 
913         if (cmd->data && (cmd->error == 0) &&
914             (cmd->data->error == 0)) {
915                 if (s3cmci_host_usedma(host) && (!host->dma_complete)) {
916                         dbg(host, dbg_dma, "DMA Missing (%d)!\n",
917                             host->dma_complete);
918                         return;
919                 }
920         }
921 
922         /* Read response from controller. */
923         cmd->resp[0] = readl(host->base + S3C2410_SDIRSP0);
924         cmd->resp[1] = readl(host->base + S3C2410_SDIRSP1);
925         cmd->resp[2] = readl(host->base + S3C2410_SDIRSP2);
926         cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3);
927 
928         writel(host->prescaler, host->base + S3C2410_SDIPRE);
929 
930         if (cmd->error)
931                 debug_as_failure = 1;
932 
933         if (cmd->data && cmd->data->error)
934                 debug_as_failure = 1;
935 
936         dbg_dumpcmd(host, cmd, debug_as_failure);
937 
938         /* Cleanup controller */
939         writel(0, host->base + S3C2410_SDICMDARG);
940         writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
941         writel(0, host->base + S3C2410_SDICMDCON);
942         clear_imask(host);
943 
944         if (cmd->data && cmd->error)
945                 cmd->data->error = cmd->error;
946 
947         if (cmd->data && cmd->data->stop && (!host->cmd_is_stop)) {
948                 host->cmd_is_stop = 1;
949                 s3cmci_send_request(host->mmc);
950                 return;
951         }
952 
953         /* If we have no data transfer we are finished here */
954         if (!mrq->data)
955                 goto request_done;
956 
957         /* Calculate the amout of bytes transfer if there was no error */
958         if (mrq->data->error == 0) {
959                 mrq->data->bytes_xfered =
960                         (mrq->data->blocks * mrq->data->blksz);
961         } else {
962                 mrq->data->bytes_xfered = 0;
963         }
964 
965         /* If we had an error while transferring data we flush the
966          * DMA channel and the fifo to clear out any garbage. */
967         if (mrq->data->error != 0) {
968                 if (s3cmci_host_usedma(host))
969                         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
970 
971                 if (host->is2440) {
972                         /* Clear failure register and reset fifo. */
973                         writel(S3C2440_SDIFSTA_FIFORESET |
974                                S3C2440_SDIFSTA_FIFOFAIL,
975                                host->base + S3C2410_SDIFSTA);
976                 } else {
977                         u32 mci_con;
978 
979                         /* reset fifo */
980                         mci_con = readl(host->base + S3C2410_SDICON);
981                         mci_con |= S3C2410_SDICON_FIFORESET;
982 
983                         writel(mci_con, host->base + S3C2410_SDICON);
984                 }
985         }
986 
987 request_done:
988         host->complete_what = COMPLETION_NONE;
989         host->mrq = NULL;
990 
991         s3cmci_check_sdio_irq(host);
992         mmc_request_done(host->mmc, mrq);
993 }
994 
995 static void s3cmci_dma_setup(struct s3cmci_host *host,
996                              enum dma_data_direction source)
997 {
998         static enum dma_data_direction last_source = -1;
999         static int setup_ok;
1000 
1001         if (last_source == source)
1002                 return;
1003 
1004         last_source = source;
1005 
1006         s3c2410_dma_devconfig(host->dma, source,
1007                               host->mem->start + host->sdidata);
1008 
1009         if (!setup_ok) {
1010                 s3c2410_dma_config(host->dma, 4);
1011                 s3c2410_dma_set_buffdone_fn(host->dma,
1012                                             s3cmci_dma_done_callback);
1013                 s3c2410_dma_setflags(host->dma, S3C2410_DMAF_AUTOSTART);
1014                 setup_ok = 1;
1015         }
1016 }
1017 
1018 static void s3cmci_send_command(struct s3cmci_host *host,
1019                                         struct mmc_command *cmd)
1020 {
1021         u32 ccon, imsk;
1022 
1023         imsk  = S3C2410_SDIIMSK_CRCSTATUS | S3C2410_SDIIMSK_CMDTIMEOUT |
1024                 S3C2410_SDIIMSK_RESPONSEND | S3C2410_SDIIMSK_CMDSENT |
1025                 S3C2410_SDIIMSK_RESPONSECRC;
1026 
1027         enable_imask(host, imsk);
1028 
1029         if (cmd->data)
1030                 host->complete_what = COMPLETION_XFERFINISH_RSPFIN;
1031         else if (cmd->flags & MMC_RSP_PRESENT)
1032                 host->complete_what = COMPLETION_RSPFIN;
1033         else
1034                 host->complete_what = COMPLETION_CMDSENT;
1035 
1036         writel(cmd->arg, host->base + S3C2410_SDICMDARG);
1037 
1038         ccon  = cmd->opcode & S3C2410_SDICMDCON_INDEX;
1039         ccon |= S3C2410_SDICMDCON_SENDERHOST | S3C2410_SDICMDCON_CMDSTART;
1040 
1041         if (cmd->flags & MMC_RSP_PRESENT)
1042                 ccon |= S3C2410_SDICMDCON_WAITRSP;
1043 
1044         if (cmd->flags & MMC_RSP_136)
1045                 ccon |= S3C2410_SDICMDCON_LONGRSP;
1046 
1047         writel(ccon, host->base + S3C2410_SDICMDCON);
1048 }
1049 
1050 static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
1051 {
1052         u32 dcon, imsk, stoptries = 3;
1053 
1054         /* write DCON register */
1055 
1056         if (!data) {
1057                 writel(0, host->base + S3C2410_SDIDCON);
1058                 return 0;
1059         }
1060 
1061         if ((data->blksz & 3) != 0) {
1062                 /* We cannot deal with unaligned blocks with more than
1063                  * one block being transferred. */
1064 
1065                 if (data->blocks > 1) {
1066                         pr_warning("%s: can't do non-word sized block transfers (blksz %d)\n", __func__, data->blksz);
1067                         return -EINVAL;
1068                 }
1069         }
1070 
1071         while (readl(host->base + S3C2410_SDIDSTA) &
1072                (S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {
1073 
1074                 dbg(host, dbg_err,
1075                     "mci_setup_data() transfer stillin progress.\n");
1076 
1077                 writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
1078                 s3cmci_reset(host);
1079 
1080                 if ((stoptries--) == 0) {
1081                         dbg_dumpregs(host, "DRF");
1082                         return -EINVAL;
1083                 }
1084         }
1085 
1086         dcon  = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
1087 
1088         if (s3cmci_host_usedma(host))
1089                 dcon |= S3C2410_SDIDCON_DMAEN;
1090 
1091         if (host->bus_width == MMC_BUS_WIDTH_4)
1092                 dcon |= S3C2410_SDIDCON_WIDEBUS;
1093 
1094         if (!(data->flags & MMC_DATA_STREAM))
1095                 dcon |= S3C2410_SDIDCON_BLOCKMODE;
1096 
1097         if (data->flags & MMC_DATA_WRITE) {
1098                 dcon |= S3C2410_SDIDCON_TXAFTERRESP;
1099                 dcon |= S3C2410_SDIDCON_XFER_TXSTART;
1100         }
1101 
1102         if (data->flags & MMC_DATA_READ) {
1103                 dcon |= S3C2410_SDIDCON_RXAFTERCMD;
1104                 dcon |= S3C2410_SDIDCON_XFER_RXSTART;
1105         }
1106 
1107         if (host->is2440) {
1108                 dcon |= S3C2440_SDIDCON_DS_WORD;
1109                 dcon |= S3C2440_SDIDCON_DATSTART;
1110         }
1111 
1112         writel(dcon, host->base + S3C2410_SDIDCON);
1113 
1114         /* write BSIZE register */
1115 
1116         writel(data->blksz, host->base + S3C2410_SDIBSIZE);
1117 
1118         /* add to IMASK register */
1119         imsk = S3C2410_SDIIMSK_FIFOFAIL | S3C2410_SDIIMSK_DATACRC |
1120                S3C2410_SDIIMSK_DATATIMEOUT | S3C2410_SDIIMSK_DATAFINISH;
1121 
1122         enable_imask(host, imsk);
1123 
1124         /* write TIMER register */
1125 
1126         if (host->is2440) {
1127                 writel(0x007FFFFF, host->base + S3C2410_SDITIMER);
1128         } else {
1129                 writel(0x0000FFFF, host->base + S3C2410_SDITIMER);
1130 
1131                 /* FIX: set slow clock to prevent timeouts on read */
1132                 if (data->flags & MMC_DATA_READ)
1133                         writel(0xFF, host->base + S3C2410_SDIPRE);
1134         }
1135 
1136         return 0;
1137 }
1138 
1139 #define BOTH_DIR (MMC_DATA_WRITE | MMC_DATA_READ)
1140 
1141 static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
1142 {
1143         int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
1144 
1145         BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
1146 
1147         host->pio_sgptr = 0;
1148         host->pio_bytes = 0;
1149         host->pio_count = 0;
1150         host->pio_active = rw ? XFER_WRITE : XFER_READ;
1151 
1152         if (rw) {
1153                 do_pio_write(host);
1154                 enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
1155         } else {
1156                 enable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF
1157                              | S3C2410_SDIIMSK_RXFIFOLAST);
1158         }
1159 
1160         return 0;
1161 }
1162 
1163 static int s3cmci_prepare_dma(struct s3cmci_host *host, struct mmc_data *data)
1164 {
1165         int dma_len, i;
1166         int rw = data->flags & MMC_DATA_WRITE;
1167 
1168         BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
1169 
1170         s3cmci_dma_setup(host, rw ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1171         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
1172 
1173         dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
1174                              rw ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1175 
1176         if (dma_len == 0)
1177                 return -ENOMEM;
1178 
1179         host->dma_complete = 0;
1180         host->dmatogo = dma_len;
1181 
1182         for (i = 0; i < dma_len; i++) {
1183                 int res;
1184 
1185                 dbg(host, dbg_dma, "enqueue %i: %08x@%u\n", i,
1186                     sg_dma_address(&data->sg[i]),
1187                     sg_dma_len(&data->sg[i]));
1188 
1189                 res = s3c2410_dma_enqueue(host->dma, host,
1190                                           sg_dma_address(&data->sg[i]),
1191                                           sg_dma_len(&data->sg[i]));
1192 
1193                 if (res) {
1194                         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
1195                         return -EBUSY;
1196                 }
1197         }
1198 
1199         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_START);
1200 
1201         return 0;
1202 }
1203 
1204 static void s3cmci_send_request(struct mmc_host *mmc)
1205 {
1206         struct s3cmci_host *host = mmc_priv(mmc);
1207         struct mmc_request *mrq = host->mrq;
1208         struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
1209 
1210         host->ccnt++;
1211         prepare_dbgmsg(host, cmd, host->cmd_is_stop);
1212 
1213         /* Clear command, data and fifo status registers
1214            Fifo clear only necessary on 2440, but doesn't hurt on 2410
1215         */
1216         writel(0xFFFFFFFF, host->base + S3C2410_SDICMDSTAT);
1217         writel(0xFFFFFFFF, host->base + S3C2410_SDIDSTA);
1218         writel(0xFFFFFFFF, host->base + S3C2410_SDIFSTA);
1219 
1220         if (cmd->data) {
1221                 int res = s3cmci_setup_data(host, cmd->data);
1222 
1223                 host->dcnt++;
1224 
1225                 if (res) {
1226                         dbg(host, dbg_err, "setup data error %d\n", res);
1227                         cmd->error = res;
1228                         cmd->data->error = res;
1229 
1230                         mmc_request_done(mmc, mrq);
1231                         return;
1232                 }
1233 
1234                 if (s3cmci_host_usedma(host))
1235                         res = s3cmci_prepare_dma(host, cmd->data);
1236                 else
1237                         res = s3cmci_prepare_pio(host, cmd->data);
1238 
1239                 if (res) {
1240                         dbg(host, dbg_err, "data prepare error %d\n", res);
1241                         cmd->error = res;
1242                         cmd->data->error = res;
1243 
1244                         mmc_request_done(mmc, mrq);
1245                         return;
1246                 }
1247         }
1248 
1249         /* Send command */
1250         s3cmci_send_command(host, cmd);
1251 
1252         /* Enable Interrupt */
1253         s3cmci_enable_irq(host, true);
1254 }
1255 
1256 static int s3cmci_card_present(struct mmc_host *mmc)
1257 {
1258         struct s3cmci_host *host = mmc_priv(mmc);
1259         struct s3c24xx_mci_pdata *pdata = host->pdata;
1260         int ret;
1261 
1262         if (pdata->no_detect)
1263                 return -ENOSYS;
1264 
1265         ret = gpio_get_value(pdata->gpio_detect) ? 0 : 1;
1266         return ret ^ pdata->detect_invert;
1267 }
1268 
1269 static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1270 {
1271         struct s3cmci_host *host = mmc_priv(mmc);
1272 
1273         host->status = "mmc request";
1274         host->cmd_is_stop = 0;
1275         host->mrq = mrq;
1276 
1277         if (s3cmci_card_present(mmc) == 0) {
1278                 dbg(host, dbg_err, "%s: no medium present\n", __func__);
1279                 host->mrq->cmd->error = -ENOMEDIUM;
1280                 mmc_request_done(mmc, mrq);
1281         } else
1282                 s3cmci_send_request(mmc);
1283 }
1284 
1285 static void s3cmci_set_clk(struct s3cmci_host *host, struct mmc_ios *ios)
1286 {
1287         u32 mci_psc;
1288 
1289         /* Set clock */
1290         for (mci_psc = 0; mci_psc < 255; mci_psc++) {
1291                 host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
1292 
1293                 if (host->real_rate <= ios->clock)
1294                         break;
1295         }
1296 
1297         if (mci_psc > 255)
1298                 mci_psc = 255;
1299 
1300         host->prescaler = mci_psc;
1301         writel(host->prescaler, host->base + S3C2410_SDIPRE);
1302 
1303         /* If requested clock is 0, real_rate will be 0, too */
1304         if (ios->clock == 0)
1305                 host->real_rate = 0;
1306 }
1307 
1308 static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1309 {
1310         struct s3cmci_host *host = mmc_priv(mmc);
1311         u32 mci_con;
1312 
1313         /* Set the power state */
1314 
1315         mci_con = readl(host->base + S3C2410_SDICON);
1316 
1317         switch (ios->power_mode) {
1318         case MMC_POWER_ON:
1319         case MMC_POWER_UP:
1320                 /* Configure GPE5...GPE10 pins in SD mode */
1321                 s3c_gpio_cfgall_range(S3C2410_GPE(5), 6, S3C_GPIO_SFN(2),
1322                                       S3C_GPIO_PULL_NONE);
1323 
1324                 if (host->pdata->set_power)
1325                         host->pdata->set_power(ios->power_mode, ios->vdd);
1326 
1327                 if (!host->is2440)
1328                         mci_con |= S3C2410_SDICON_FIFORESET;
1329 
1330                 break;
1331 
1332         case MMC_POWER_OFF:
1333         default:
1334                 gpio_direction_output(S3C2410_GPE(5), 0);
1335 
1336                 if (host->is2440)
1337                         mci_con |= S3C2440_SDICON_SDRESET;
1338 
1339                 if (host->pdata->set_power)
1340                         host->pdata->set_power(ios->power_mode, ios->vdd);
1341 
1342                 break;
1343         }
1344 
1345         s3cmci_set_clk(host, ios);
1346 
1347         /* Set CLOCK_ENABLE */
1348         if (ios->clock)
1349                 mci_con |= S3C2410_SDICON_CLOCKTYPE;
1350         else
1351                 mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
1352 
1353         writel(mci_con, host->base + S3C2410_SDICON);
1354 
1355         if ((ios->power_mode == MMC_POWER_ON) ||
1356             (ios->power_mode == MMC_POWER_UP)) {
1357                 dbg(host, dbg_conf, "running at %lukHz (requested: %ukHz).\n",
1358                         host->real_rate/1000, ios->clock/1000);
1359         } else {
1360                 dbg(host, dbg_conf, "powered down.\n");
1361         }
1362 
1363         host->bus_width = ios->bus_width;
1364 }
1365 
1366 static void s3cmci_reset(struct s3cmci_host *host)
1367 {
1368         u32 con = readl(host->base + S3C2410_SDICON);
1369 
1370         con |= S3C2440_SDICON_SDRESET;
1371         writel(con, host->base + S3C2410_SDICON);
1372 }
1373 
1374 static int s3cmci_get_ro(struct mmc_host *mmc)
1375 {
1376         struct s3cmci_host *host = mmc_priv(mmc);
1377         struct s3c24xx_mci_pdata *pdata = host->pdata;
1378         int ret;
1379 
1380         if (pdata->no_wprotect)
1381                 return 0;
1382 
1383         ret = gpio_get_value(pdata->gpio_wprotect) ? 1 : 0;
1384         ret ^= pdata->wprotect_invert;
1385 
1386         return ret;
1387 }
1388 
1389 static void s3cmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1390 {
1391         struct s3cmci_host *host = mmc_priv(mmc);
1392         unsigned long flags;
1393         u32 con;
1394 
1395         local_irq_save(flags);
1396 
1397         con = readl(host->base + S3C2410_SDICON);
1398         host->sdio_irqen = enable;
1399 
1400         if (enable == host->sdio_irqen)
1401                 goto same_state;
1402 
1403         if (enable) {
1404                 con |= S3C2410_SDICON_SDIOIRQ;
1405                 enable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
1406 
1407                 if (!host->irq_state && !host->irq_disabled) {
1408                         host->irq_state = true;
1409                         enable_irq(host->irq);
1410                 }
1411         } else {
1412                 disable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
1413                 con &= ~S3C2410_SDICON_SDIOIRQ;
1414 
1415                 if (!host->irq_enabled && host->irq_state) {
1416                         disable_irq_nosync(host->irq);
1417                         host->irq_state = false;
1418                 }
1419         }
1420 
1421         writel(con, host->base + S3C2410_SDICON);
1422 
1423  same_state:
1424         local_irq_restore(flags);
1425 
1426         s3cmci_check_sdio_irq(host);
1427 }
1428 
1429 static struct mmc_host_ops s3cmci_ops = {
1430         .request        = s3cmci_request,
1431         .set_ios        = s3cmci_set_ios,
1432         .get_ro         = s3cmci_get_ro,
1433         .get_cd         = s3cmci_card_present,
1434         .enable_sdio_irq = s3cmci_enable_sdio_irq,
1435 };
1436 
1437 static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
1438         /* This is currently here to avoid a number of if (host->pdata)
1439          * checks. Any zero fields to ensure reasonable defaults are picked. */
1440          .no_wprotect = 1,
1441          .no_detect = 1,
1442 };
1443 
1444 #ifdef CONFIG_CPU_FREQ
1445 
1446 static int s3cmci_cpufreq_transition(struct notifier_block *nb,
1447                                      unsigned long val, void *data)
1448 {
1449         struct s3cmci_host *host;
1450         struct mmc_host *mmc;
1451         unsigned long newclk;
1452         unsigned long flags;
1453 
1454         host = container_of(nb, struct s3cmci_host, freq_transition);
1455         newclk = clk_get_rate(host->clk);
1456         mmc = host->mmc;
1457 
1458         if ((val == CPUFREQ_PRECHANGE && newclk > host->clk_rate) ||
1459             (val == CPUFREQ_POSTCHANGE && newclk < host->clk_rate)) {
1460                 spin_lock_irqsave(&mmc->lock, flags);
1461 
1462                 host->clk_rate = newclk;
1463 
1464                 if (mmc->ios.power_mode != MMC_POWER_OFF &&
1465                     mmc->ios.clock != 0)
1466                         s3cmci_set_clk(host, &mmc->ios);
1467 
1468                 spin_unlock_irqrestore(&mmc->lock, flags);
1469         }
1470 
1471         return 0;
1472 }
1473 
1474 static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1475 {
1476         host->freq_transition.notifier_call = s3cmci_cpufreq_transition;
1477 
1478         return cpufreq_register_notifier(&host->freq_transition,
1479                                          CPUFREQ_TRANSITION_NOTIFIER);
1480 }
1481 
1482 static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1483 {
1484         cpufreq_unregister_notifier(&host->freq_transition,
1485                                     CPUFREQ_TRANSITION_NOTIFIER);
1486 }
1487 
1488 #else
1489 static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1490 {
1491         return 0;
1492 }
1493 
1494 static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1495 {
1496 }
1497 #endif
1498 
1499 
1500 #ifdef CONFIG_DEBUG_FS
1501 
1502 static int s3cmci_state_show(struct seq_file *seq, void *v)
1503 {
1504         struct s3cmci_host *host = seq->private;
1505 
1506         seq_printf(seq, "Register base = 0x%08x\n", (u32)host->base);
1507         seq_printf(seq, "Clock rate = %ld\n", host->clk_rate);
1508         seq_printf(seq, "Prescale = %d\n", host->prescaler);
1509         seq_printf(seq, "is2440 = %d\n", host->is2440);
1510         seq_printf(seq, "IRQ = %d\n", host->irq);
1511         seq_printf(seq, "IRQ enabled = %d\n", host->irq_enabled);
1512         seq_printf(seq, "IRQ disabled = %d\n", host->irq_disabled);
1513         seq_printf(seq, "IRQ state = %d\n", host->irq_state);
1514         seq_printf(seq, "CD IRQ = %d\n", host->irq_cd);
1515         seq_printf(seq, "Do DMA = %d\n", s3cmci_host_usedma(host));
1516         seq_printf(seq, "SDIIMSK at %d\n", host->sdiimsk);
1517         seq_printf(seq, "SDIDATA at %d\n", host->sdidata);
1518 
1519         return 0;
1520 }
1521 
1522 static int s3cmci_state_open(struct inode *inode, struct file *file)
1523 {
1524         return single_open(file, s3cmci_state_show, inode->i_private);
1525 }
1526 
1527 static const struct file_operations s3cmci_fops_state = {
1528         .owner          = THIS_MODULE,
1529         .open           = s3cmci_state_open,
1530         .read           = seq_read,
1531         .llseek         = seq_lseek,
1532         .release        = single_release,
1533 };
1534 
1535 #define DBG_REG(_r) { .addr = S3C2410_SDI##_r, .name = #_r }
1536 
1537 struct s3cmci_reg {
1538         unsigned short  addr;
1539         unsigned char   *name;
1540 } debug_regs[] = {
1541         DBG_REG(CON),
1542         DBG_REG(PRE),
1543         DBG_REG(CMDARG),
1544         DBG_REG(CMDCON),
1545         DBG_REG(CMDSTAT),
1546         DBG_REG(RSP0),
1547         DBG_REG(RSP1),
1548         DBG_REG(RSP2),
1549         DBG_REG(RSP3),
1550         DBG_REG(TIMER),
1551         DBG_REG(BSIZE),
1552         DBG_REG(DCON),
1553         DBG_REG(DCNT),
1554         DBG_REG(DSTA),
1555         DBG_REG(FSTA),
1556         {}
1557 };
1558 
1559 static int s3cmci_regs_show(struct seq_file *seq, void *v)
1560 {
1561         struct s3cmci_host *host = seq->private;
1562         struct s3cmci_reg *rptr = debug_regs;
1563 
1564         for (; rptr->name; rptr++)
1565                 seq_printf(seq, "SDI%s\t=0x%08x\n", rptr->name,
1566                            readl(host->base + rptr->addr));
1567 
1568         seq_printf(seq, "SDIIMSK\t=0x%08x\n", readl(host->base + host->sdiimsk));
1569 
1570         return 0;
1571 }
1572 
1573 static int s3cmci_regs_open(struct inode *inode, struct file *file)
1574 {
1575         return single_open(file, s3cmci_regs_show, inode->i_private);
1576 }
1577 
1578 static const struct file_operations s3cmci_fops_regs = {
1579         .owner          = THIS_MODULE,
1580         .open           = s3cmci_regs_open,
1581         .read           = seq_read,
1582         .llseek         = seq_lseek,
1583         .release        = single_release,
1584 };
1585 
1586 static void s3cmci_debugfs_attach(struct s3cmci_host *host)
1587 {
1588         struct device *dev = &host->pdev->dev;
1589 
1590         host->debug_root = debugfs_create_dir(dev_name(dev), NULL);
1591         if (IS_ERR(host->debug_root)) {
1592                 dev_err(dev, "failed to create debugfs root\n");
1593                 return;
1594         }
1595 
1596         host->debug_state = debugfs_create_file("state", 0444,
1597                                                 host->debug_root, host,
1598                                                 &s3cmci_fops_state);
1599 
1600         if (IS_ERR(host->debug_state))
1601                 dev_err(dev, "failed to create debug state file\n");
1602 
1603         host->debug_regs = debugfs_create_file("regs", 0444,
1604                                                host->debug_root, host,
1605                                                &s3cmci_fops_regs);
1606 
1607         if (IS_ERR(host->debug_regs))
1608                 dev_err(dev, "failed to create debug regs file\n");
1609 }
1610 
1611 static void s3cmci_debugfs_remove(struct s3cmci_host *host)
1612 {
1613         debugfs_remove(host->debug_regs);
1614         debugfs_remove(host->debug_state);
1615         debugfs_remove(host->debug_root);
1616 }
1617 
1618 #else
1619 static inline void s3cmci_debugfs_attach(struct s3cmci_host *host) { }
1620 static inline void s3cmci_debugfs_remove(struct s3cmci_host *host) { }
1621 
1622 #endif /* CONFIG_DEBUG_FS */
1623 
1624 static int s3cmci_probe(struct platform_device *pdev)
1625 {
1626         struct s3cmci_host *host;
1627         struct mmc_host *mmc;
1628         int ret;
1629         int is2440;
1630         int i;
1631 
1632         is2440 = platform_get_device_id(pdev)->driver_data;
1633 
1634         mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
1635         if (!mmc) {
1636                 ret = -ENOMEM;
1637                 goto probe_out;
1638         }
1639 
1640         for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++) {
1641                 ret = gpio_request(i, dev_name(&pdev->dev));
1642                 if (ret) {
1643                         dev_err(&pdev->dev, "failed to get gpio %d\n", i);
1644 
1645                         for (i--; i >= S3C2410_GPE(5); i--)
1646                                 gpio_free(i);
1647 
1648                         goto probe_free_host;
1649                 }
1650         }
1651 
1652         host = mmc_priv(mmc);
1653         host->mmc       = mmc;
1654         host->pdev      = pdev;
1655         host->is2440    = is2440;
1656 
1657         host->pdata = pdev->dev.platform_data;
1658         if (!host->pdata) {
1659                 pdev->dev.platform_data = &s3cmci_def_pdata;
1660                 host->pdata = &s3cmci_def_pdata;
1661         }
1662 
1663         spin_lock_init(&host->complete_lock);
1664         tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
1665 
1666         if (is2440) {
1667                 host->sdiimsk   = S3C2440_SDIIMSK;
1668                 host->sdidata   = S3C2440_SDIDATA;
1669                 host->clk_div   = 1;
1670         } else {
1671                 host->sdiimsk   = S3C2410_SDIIMSK;
1672                 host->sdidata   = S3C2410_SDIDATA;
1673                 host->clk_div   = 2;
1674         }
1675 
1676         host->complete_what     = COMPLETION_NONE;
1677         host->pio_active        = XFER_NONE;
1678 
1679 #ifdef CONFIG_MMC_S3C_PIODMA
1680         host->dodma             = host->pdata->use_dma;
1681 #endif
1682 
1683         host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1684         if (!host->mem) {
1685                 dev_err(&pdev->dev,
1686                         "failed to get io memory region resource.\n");
1687 
1688                 ret = -ENOENT;
1689                 goto probe_free_gpio;
1690         }
1691 
1692         host->mem = request_mem_region(host->mem->start,
1693                                        resource_size(host->mem), pdev->name);
1694 
1695         if (!host->mem) {
1696                 dev_err(&pdev->dev, "failed to request io memory region.\n");
1697                 ret = -ENOENT;
1698                 goto probe_free_gpio;
1699         }
1700 
1701         host->base = ioremap(host->mem->start, resource_size(host->mem));
1702         if (!host->base) {
1703                 dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
1704                 ret = -EINVAL;
1705                 goto probe_free_mem_region;
1706         }
1707 
1708         host->irq = platform_get_irq(pdev, 0);
1709         if (host->irq == 0) {
1710                 dev_err(&pdev->dev, "failed to get interrupt resource.\n");
1711                 ret = -EINVAL;
1712                 goto probe_iounmap;
1713         }
1714 
1715         if (request_irq(host->irq, s3cmci_irq, 0, DRIVER_NAME, host)) {
1716                 dev_err(&pdev->dev, "failed to request mci interrupt.\n");
1717                 ret = -ENOENT;
1718                 goto probe_iounmap;
1719         }
1720 
1721         /* We get spurious interrupts even when we have set the IMSK
1722          * register to ignore everything, so use disable_irq() to make
1723          * ensure we don't lock the system with un-serviceable requests. */
1724 
1725         disable_irq(host->irq);
1726         host->irq_state = false;
1727 
1728         if (!host->pdata->no_detect) {
1729                 ret = gpio_request(host->pdata->gpio_detect, "s3cmci detect");
1730                 if (ret) {
1731                         dev_err(&pdev->dev, "failed to get detect gpio\n");
1732                         goto probe_free_irq;
1733                 }
1734 
1735                 host->irq_cd = gpio_to_irq(host->pdata->gpio_detect);
1736 
1737                 if (host->irq_cd >= 0) {
1738                         if (request_irq(host->irq_cd, s3cmci_irq_cd,
1739                                         IRQF_TRIGGER_RISING |
1740                                         IRQF_TRIGGER_FALLING,
1741                                         DRIVER_NAME, host)) {
1742                                 dev_err(&pdev->dev,
1743                                         "can't get card detect irq.\n");
1744                                 ret = -ENOENT;
1745                                 goto probe_free_gpio_cd;
1746                         }
1747                 } else {
1748                         dev_warn(&pdev->dev,
1749                                  "host detect has no irq available\n");
1750                         gpio_direction_input(host->pdata->gpio_detect);
1751                 }
1752         } else
1753                 host->irq_cd = -1;
1754 
1755         if (!host->pdata->no_wprotect) {
1756                 ret = gpio_request(host->pdata->gpio_wprotect, "s3cmci wp");
1757                 if (ret) {
1758                         dev_err(&pdev->dev, "failed to get writeprotect\n");
1759                         goto probe_free_irq_cd;
1760                 }
1761 
1762                 gpio_direction_input(host->pdata->gpio_wprotect);
1763         }
1764 
1765         /* depending on the dma state, get a dma channel to use. */
1766 
1767         if (s3cmci_host_usedma(host)) {
1768                 host->dma = s3c2410_dma_request(DMACH_SDI, &s3cmci_dma_client,
1769                                                 host);
1770                 if (host->dma < 0) {
1771                         dev_err(&pdev->dev, "cannot get DMA channel.\n");
1772                         if (!s3cmci_host_canpio()) {
1773                                 ret = -EBUSY;
1774                                 goto probe_free_gpio_wp;
1775                         } else {
1776                                 dev_warn(&pdev->dev, "falling back to PIO.\n");
1777                                 host->dodma = 0;
1778                         }
1779                 }
1780         }
1781 
1782         host->clk = clk_get(&pdev->dev, "sdi");
1783         if (IS_ERR(host->clk)) {
1784                 dev_err(&pdev->dev, "failed to find clock source.\n");
1785                 ret = PTR_ERR(host->clk);
1786                 host->clk = NULL;
1787                 goto probe_free_dma;
1788         }
1789 
1790         ret = clk_enable(host->clk);
1791         if (ret) {
1792                 dev_err(&pdev->dev, "failed to enable clock source.\n");
1793                 goto clk_free;
1794         }
1795 
1796         host->clk_rate = clk_get_rate(host->clk);
1797 
1798         mmc->ops        = &s3cmci_ops;
1799         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
1800 #ifdef CONFIG_MMC_S3C_HW_SDIO_IRQ
1801         mmc->caps       = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1802 #else
1803         mmc->caps       = MMC_CAP_4_BIT_DATA;
1804 #endif
1805         mmc->f_min      = host->clk_rate / (host->clk_div * 256);
1806         mmc->f_max      = host->clk_rate / host->clk_div;
1807 
1808         if (host->pdata->ocr_avail)
1809                 mmc->ocr_avail = host->pdata->ocr_avail;
1810 
1811         mmc->max_blk_count      = 4095;
1812         mmc->max_blk_size       = 4095;
1813         mmc->max_req_size       = 4095 * 512;
1814         mmc->max_seg_size       = mmc->max_req_size;
1815 
1816         mmc->max_segs           = 128;
1817 
1818         dbg(host, dbg_debug,
1819             "probe: mode:%s mapped mci_base:%p irq:%u irq_cd:%u dma:%u.\n",
1820             (host->is2440?"2440":""),
1821             host->base, host->irq, host->irq_cd, host->dma);
1822 
1823         ret = s3cmci_cpufreq_register(host);
1824         if (ret) {
1825                 dev_err(&pdev->dev, "failed to register cpufreq\n");
1826                 goto free_dmabuf;
1827         }
1828 
1829         ret = mmc_add_host(mmc);
1830         if (ret) {
1831                 dev_err(&pdev->dev, "failed to add mmc host.\n");
1832                 goto free_cpufreq;
1833         }
1834 
1835         s3cmci_debugfs_attach(host);
1836 
1837         platform_set_drvdata(pdev, mmc);
1838         dev_info(&pdev->dev, "%s - using %s, %s SDIO IRQ\n", mmc_hostname(mmc),
1839                  s3cmci_host_usedma(host) ? "dma" : "pio",
1840                  mmc->caps & MMC_CAP_SDIO_IRQ ? "hw" : "sw");
1841 
1842         return 0;
1843 
1844  free_cpufreq:
1845         s3cmci_cpufreq_deregister(host);
1846 
1847  free_dmabuf:
1848         clk_disable(host->clk);
1849 
1850  clk_free:
1851         clk_put(host->clk);
1852 
1853  probe_free_dma:
1854         if (s3cmci_host_usedma(host))
1855                 s3c2410_dma_free(host->dma, &s3cmci_dma_client);
1856 
1857  probe_free_gpio_wp:
1858         if (!host->pdata->no_wprotect)
1859                 gpio_free(host->pdata->gpio_wprotect);
1860 
1861  probe_free_gpio_cd:
1862         if (!host->pdata->no_detect)
1863                 gpio_free(host->pdata->gpio_detect);
1864 
1865  probe_free_irq_cd:
1866         if (host->irq_cd >= 0)
1867                 free_irq(host->irq_cd, host);
1868 
1869  probe_free_irq:
1870         free_irq(host->irq, host);
1871 
1872  probe_iounmap:
1873         iounmap(host->base);
1874 
1875  probe_free_mem_region:
1876         release_mem_region(host->mem->start, resource_size(host->mem));
1877 
1878  probe_free_gpio:
1879         for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
1880                 gpio_free(i);
1881 
1882  probe_free_host:
1883         mmc_free_host(mmc);
1884 
1885  probe_out:
1886         return ret;
1887 }
1888 
1889 static void s3cmci_shutdown(struct platform_device *pdev)
1890 {
1891         struct mmc_host *mmc = platform_get_drvdata(pdev);
1892         struct s3cmci_host *host = mmc_priv(mmc);
1893 
1894         if (host->irq_cd >= 0)
1895                 free_irq(host->irq_cd, host);
1896 
1897         s3cmci_debugfs_remove(host);
1898         s3cmci_cpufreq_deregister(host);
1899         mmc_remove_host(mmc);
1900         clk_disable(host->clk);
1901 }
1902 
1903 static int s3cmci_remove(struct platform_device *pdev)
1904 {
1905         struct mmc_host         *mmc  = platform_get_drvdata(pdev);
1906         struct s3cmci_host      *host = mmc_priv(mmc);
1907         struct s3c24xx_mci_pdata *pd = host->pdata;
1908         int i;
1909 
1910         s3cmci_shutdown(pdev);
1911 
1912         clk_put(host->clk);
1913 
1914         tasklet_disable(&host->pio_tasklet);
1915 
1916         if (s3cmci_host_usedma(host))
1917                 s3c2410_dma_free(host->dma, &s3cmci_dma_client);
1918 
1919         free_irq(host->irq, host);
1920 
1921         if (!pd->no_wprotect)
1922                 gpio_free(pd->gpio_wprotect);
1923 
1924         if (!pd->no_detect)
1925                 gpio_free(pd->gpio_detect);
1926 
1927         for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
1928                 gpio_free(i);
1929 
1930 
1931         iounmap(host->base);
1932         release_mem_region(host->mem->start, resource_size(host->mem));
1933 
1934         mmc_free_host(mmc);
1935         return 0;
1936 }
1937 
1938 static struct platform_device_id s3cmci_driver_ids[] = {
1939         {
1940                 .name   = "s3c2410-sdi",
1941                 .driver_data    = 0,
1942         }, {
1943                 .name   = "s3c2412-sdi",
1944                 .driver_data    = 1,
1945         }, {
1946                 .name   = "s3c2440-sdi",
1947                 .driver_data    = 1,
1948         },
1949         { }
1950 };
1951 
1952 MODULE_DEVICE_TABLE(platform, s3cmci_driver_ids);
1953 
1954 static struct platform_driver s3cmci_driver = {
1955         .driver = {
1956                 .name   = "s3c-sdi",
1957                 .owner  = THIS_MODULE,
1958         },
1959         .id_table       = s3cmci_driver_ids,
1960         .probe          = s3cmci_probe,
1961         .remove         = s3cmci_remove,
1962         .shutdown       = s3cmci_shutdown,
1963 };
1964 
1965 module_platform_driver(s3cmci_driver);
1966 
1967 MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
1968 MODULE_LICENSE("GPL v2");
1969 MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>, Ben Dooks <ben-linux@fluff.org>");
1970 

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