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perf bench futex: Cache align the worker struct
[linux/fpc-iii.git] / drivers / mmc / host / au1xmmc.c
blobed77fbfa477404c477407f60567d2b19197e0805
1 /*
2 * linux/drivers/mmc/host/au1xmmc.c - AU1XX0 MMC driver
3 *
4 * Copyright (c) 2005, Advanced Micro Devices, Inc.
5 *
6 * Developed with help from the 2.4.30 MMC AU1XXX controller including
7 * the following copyright notices:
8 * Copyright (c) 2003-2004 Embedded Edge, LLC.
9 * Portions Copyright (C) 2002 Embedix, Inc
10 * Copyright 2002 Hewlett-Packard Company
11
12 * 2.6 version of this driver inspired by:
13 * (drivers/mmc/wbsd.c) Copyright (C) 2004-2005 Pierre Ossman,
14 * All Rights Reserved.
15 * (drivers/mmc/pxa.c) Copyright (C) 2003 Russell King,
16 * All Rights Reserved.
17 *
18
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License version 2 as
21 * published by the Free Software Foundation.
22 */
23
24 /* Why don't we use the SD controllers' carddetect feature?
25 *
26 * From the AU1100 MMC application guide:
27 * If the Au1100-based design is intended to support both MultiMediaCards
28 * and 1- or 4-data bit SecureDigital cards, then the solution is to
29 * connect a weak (560KOhm) pull-up resistor to connector pin 1.
30 * In doing so, a MMC card never enters SPI-mode communications,
31 * but now the SecureDigital card-detect feature of CD/DAT3 is ineffective
32 * (the low to high transition will not occur).
33 */
34
35 #include <linux/clk.h>
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/platform_device.h>
39 #include <linux/mm.h>
40 #include <linux/interrupt.h>
41 #include <linux/dma-mapping.h>
42 #include <linux/scatterlist.h>
43 #include <linux/leds.h>
44 #include <linux/mmc/host.h>
45 #include <linux/slab.h>
46
47 #include <asm/io.h>
48 #include <asm/mach-au1x00/au1000.h>
49 #include <asm/mach-au1x00/au1xxx_dbdma.h>
50 #include <asm/mach-au1x00/au1100_mmc.h>
51
52 #define DRIVER_NAME "au1xxx-mmc"
53
54 /* Set this to enable special debugging macros */
55 /* #define DEBUG */
56
57 #ifdef DEBUG
58 #define DBG(fmt, idx, args...) \
59 pr_debug("au1xmmc(%d): DEBUG: " fmt, idx, ##args)
60 #else
61 #define DBG(fmt, idx, args...) do {} while (0)
62 #endif
63
64 /* Hardware definitions */
65 #define AU1XMMC_DESCRIPTOR_COUNT 1
66
67 /* max DMA seg size: 64KB on Au1100, 4MB on Au1200 */
68 #define AU1100_MMC_DESCRIPTOR_SIZE 0x0000ffff
69 #define AU1200_MMC_DESCRIPTOR_SIZE 0x003fffff
70
71 #define AU1XMMC_OCR (MMC_VDD_27_28 | MMC_VDD_28_29 | MMC_VDD_29_30 | \
72 MMC_VDD_30_31 | MMC_VDD_31_32 | MMC_VDD_32_33 | \
73 MMC_VDD_33_34 | MMC_VDD_34_35 | MMC_VDD_35_36)
74
75 /* This gives us a hard value for the stop command that we can write directly
76 * to the command register.
77 */
78 #define STOP_CMD \
79 (SD_CMD_RT_1B | SD_CMD_CT_7 | (0xC << SD_CMD_CI_SHIFT) | SD_CMD_GO)
80
81 /* This is the set of interrupts that we configure by default. */
82 #define AU1XMMC_INTERRUPTS \
83 (SD_CONFIG_SC | SD_CONFIG_DT | SD_CONFIG_RAT | \
84 SD_CONFIG_CR | SD_CONFIG_I)
85
86 /* The poll event (looking for insert/remove events runs twice a second. */
87 #define AU1XMMC_DETECT_TIMEOUT (HZ/2)
88
89 struct au1xmmc_host {
90 struct mmc_host *mmc;
91 struct mmc_request *mrq;
92
93 u32 flags;
94 void __iomem *iobase;
95 u32 clock;
96 u32 bus_width;
97 u32 power_mode;
98
99 int status;
100
101 struct {
102 int len;
103 int dir;
104 } dma;
105
106 struct {
107 int index;
108 int offset;
109 int len;
110 } pio;
111
112 u32 tx_chan;
113 u32 rx_chan;
114
115 int irq;
116
117 struct tasklet_struct finish_task;
118 struct tasklet_struct data_task;
119 struct au1xmmc_platform_data *platdata;
120 struct platform_device *pdev;
121 struct resource *ioarea;
122 struct clk *clk;
123 };
124
125 /* Status flags used by the host structure */
126 #define HOST_F_XMIT 0x0001
127 #define HOST_F_RECV 0x0002
128 #define HOST_F_DMA 0x0010
129 #define HOST_F_DBDMA 0x0020
130 #define HOST_F_ACTIVE 0x0100
131 #define HOST_F_STOP 0x1000
132
133 #define HOST_S_IDLE 0x0001
134 #define HOST_S_CMD 0x0002
135 #define HOST_S_DATA 0x0003
136 #define HOST_S_STOP 0x0004
137
138 /* Easy access macros */
139 #define HOST_STATUS(h) ((h)->iobase + SD_STATUS)
140 #define HOST_CONFIG(h) ((h)->iobase + SD_CONFIG)
141 #define HOST_ENABLE(h) ((h)->iobase + SD_ENABLE)
142 #define HOST_TXPORT(h) ((h)->iobase + SD_TXPORT)
143 #define HOST_RXPORT(h) ((h)->iobase + SD_RXPORT)
144 #define HOST_CMDARG(h) ((h)->iobase + SD_CMDARG)
145 #define HOST_BLKSIZE(h) ((h)->iobase + SD_BLKSIZE)
146 #define HOST_CMD(h) ((h)->iobase + SD_CMD)
147 #define HOST_CONFIG2(h) ((h)->iobase + SD_CONFIG2)
148 #define HOST_TIMEOUT(h) ((h)->iobase + SD_TIMEOUT)
149 #define HOST_DEBUG(h) ((h)->iobase + SD_DEBUG)
150
151 #define DMA_CHANNEL(h) \
152 (((h)->flags & HOST_F_XMIT) ? (h)->tx_chan : (h)->rx_chan)
153
154 static inline int has_dbdma(void)
155 {
156 switch (alchemy_get_cputype()) {
157 case ALCHEMY_CPU_AU1200:
158 case ALCHEMY_CPU_AU1300:
159 return 1;
160 default:
161 return 0;
162 }
163 }
164
165 static inline void IRQ_ON(struct au1xmmc_host *host, u32 mask)
166 {
167 u32 val = __raw_readl(HOST_CONFIG(host));
168 val |= mask;
169 __raw_writel(val, HOST_CONFIG(host));
170 wmb(); /* drain writebuffer */
171 }
172
173 static inline void FLUSH_FIFO(struct au1xmmc_host *host)
174 {
175 u32 val = __raw_readl(HOST_CONFIG2(host));
176
177 __raw_writel(val | SD_CONFIG2_FF, HOST_CONFIG2(host));
178 wmb(); /* drain writebuffer */
179 mdelay(1);
180
181 /* SEND_STOP will turn off clock control - this re-enables it */
182 val &= ~SD_CONFIG2_DF;
183
184 __raw_writel(val, HOST_CONFIG2(host));
185 wmb(); /* drain writebuffer */
186 }
187
188 static inline void IRQ_OFF(struct au1xmmc_host *host, u32 mask)
189 {
190 u32 val = __raw_readl(HOST_CONFIG(host));
191 val &= ~mask;
192 __raw_writel(val, HOST_CONFIG(host));
193 wmb(); /* drain writebuffer */
194 }
195
196 static inline void SEND_STOP(struct au1xmmc_host *host)
197 {
198 u32 config2;
199
200 WARN_ON(host->status != HOST_S_DATA);
201 host->status = HOST_S_STOP;
202
203 config2 = __raw_readl(HOST_CONFIG2(host));
204 __raw_writel(config2 | SD_CONFIG2_DF, HOST_CONFIG2(host));
205 wmb(); /* drain writebuffer */
206
207 /* Send the stop command */
208 __raw_writel(STOP_CMD, HOST_CMD(host));
209 wmb(); /* drain writebuffer */
210 }
211
212 static void au1xmmc_set_power(struct au1xmmc_host *host, int state)
213 {
214 if (host->platdata && host->platdata->set_power)
215 host->platdata->set_power(host->mmc, state);
216 }
217
218 static int au1xmmc_card_inserted(struct mmc_host *mmc)
219 {
220 struct au1xmmc_host *host = mmc_priv(mmc);
221
222 if (host->platdata && host->platdata->card_inserted)
223 return !!host->platdata->card_inserted(host->mmc);
224
225 return -ENOSYS;
226 }
227
228 static int au1xmmc_card_readonly(struct mmc_host *mmc)
229 {
230 struct au1xmmc_host *host = mmc_priv(mmc);
231
232 if (host->platdata && host->platdata->card_readonly)
233 return !!host->platdata->card_readonly(mmc);
234
235 return -ENOSYS;
236 }
237
238 static void au1xmmc_finish_request(struct au1xmmc_host *host)
239 {
240 struct mmc_request *mrq = host->mrq;
241
242 host->mrq = NULL;
243 host->flags &= HOST_F_ACTIVE | HOST_F_DMA;
244
245 host->dma.len = 0;
246 host->dma.dir = 0;
247
248 host->pio.index = 0;
249 host->pio.offset = 0;
250 host->pio.len = 0;
251
252 host->status = HOST_S_IDLE;
253
254 mmc_request_done(host->mmc, mrq);
255 }
256
257 static void au1xmmc_tasklet_finish(unsigned long param)
258 {
259 struct au1xmmc_host *host = (struct au1xmmc_host *) param;
260 au1xmmc_finish_request(host);
261 }
262
263 static int au1xmmc_send_command(struct au1xmmc_host *host, int wait,
264 struct mmc_command *cmd, struct mmc_data *data)
265 {
266 u32 mmccmd = (cmd->opcode << SD_CMD_CI_SHIFT);
267
268 switch (mmc_resp_type(cmd)) {
269 case MMC_RSP_NONE:
270 break;
271 case MMC_RSP_R1:
272 mmccmd |= SD_CMD_RT_1;
273 break;
274 case MMC_RSP_R1B:
275 mmccmd |= SD_CMD_RT_1B;
276 break;
277 case MMC_RSP_R2:
278 mmccmd |= SD_CMD_RT_2;
279 break;
280 case MMC_RSP_R3:
281 mmccmd |= SD_CMD_RT_3;
282 break;
283 default:
284 pr_info("au1xmmc: unhandled response type %02x\n",
285 mmc_resp_type(cmd));
286 return -EINVAL;
287 }
288
289 if (data) {
290 if (data->flags & MMC_DATA_READ) {
291 if (data->blocks > 1)
292 mmccmd |= SD_CMD_CT_4;
293 else
294 mmccmd |= SD_CMD_CT_2;
295 } else if (data->flags & MMC_DATA_WRITE) {
296 if (data->blocks > 1)
297 mmccmd |= SD_CMD_CT_3;
298 else
299 mmccmd |= SD_CMD_CT_1;
300 }
301 }
302
303 __raw_writel(cmd->arg, HOST_CMDARG(host));
304 wmb(); /* drain writebuffer */
305
306 if (wait)
307 IRQ_OFF(host, SD_CONFIG_CR);
308
309 __raw_writel((mmccmd | SD_CMD_GO), HOST_CMD(host));
310 wmb(); /* drain writebuffer */
311
312 /* Wait for the command to go on the line */
313 while (__raw_readl(HOST_CMD(host)) & SD_CMD_GO)
314 /* nop */;
315
316 /* Wait for the command to come back */
317 if (wait) {
318 u32 status = __raw_readl(HOST_STATUS(host));
319
320 while (!(status & SD_STATUS_CR))
321 status = __raw_readl(HOST_STATUS(host));
322
323 /* Clear the CR status */
324 __raw_writel(SD_STATUS_CR, HOST_STATUS(host));
325
326 IRQ_ON(host, SD_CONFIG_CR);
327 }
328
329 return 0;
330 }
331
332 static void au1xmmc_data_complete(struct au1xmmc_host *host, u32 status)
333 {
334 struct mmc_request *mrq = host->mrq;
335 struct mmc_data *data;
336 u32 crc;
337
338 WARN_ON((host->status != HOST_S_DATA) && (host->status != HOST_S_STOP));
339
340 if (host->mrq == NULL)
341 return;
342
343 data = mrq->cmd->data;
344
345 if (status == 0)
346 status = __raw_readl(HOST_STATUS(host));
347
348 /* The transaction is really over when the SD_STATUS_DB bit is clear */
349 while ((host->flags & HOST_F_XMIT) && (status & SD_STATUS_DB))
350 status = __raw_readl(HOST_STATUS(host));
351
352 data->error = 0;
353 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, host->dma.dir);
354
355 /* Process any errors */
356 crc = (status & (SD_STATUS_WC | SD_STATUS_RC));
357 if (host->flags & HOST_F_XMIT)
358 crc |= ((status & 0x07) == 0x02) ? 0 : 1;
359
360 if (crc)
361 data->error = -EILSEQ;
362
363 /* Clear the CRC bits */
364 __raw_writel(SD_STATUS_WC | SD_STATUS_RC, HOST_STATUS(host));
365
366 data->bytes_xfered = 0;
367
368 if (!data->error) {
369 if (host->flags & (HOST_F_DMA | HOST_F_DBDMA)) {
370 u32 chan = DMA_CHANNEL(host);
371
372 chan_tab_t *c = *((chan_tab_t **)chan);
373 au1x_dma_chan_t *cp = c->chan_ptr;
374 data->bytes_xfered = cp->ddma_bytecnt;
375 } else
376 data->bytes_xfered =
377 (data->blocks * data->blksz) - host->pio.len;
378 }
379
380 au1xmmc_finish_request(host);
381 }
382
383 static void au1xmmc_tasklet_data(unsigned long param)
384 {
385 struct au1xmmc_host *host = (struct au1xmmc_host *)param;
386
387 u32 status = __raw_readl(HOST_STATUS(host));
388 au1xmmc_data_complete(host, status);
389 }
390
391 #define AU1XMMC_MAX_TRANSFER 8
392
393 static void au1xmmc_send_pio(struct au1xmmc_host *host)
394 {
395 struct mmc_data *data;
396 int sg_len, max, count;
397 unsigned char *sg_ptr, val;
398 u32 status;
399 struct scatterlist *sg;
400
401 data = host->mrq->data;
402
403 if (!(host->flags & HOST_F_XMIT))
404 return;
405
406 /* This is the pointer to the data buffer */
407 sg = &data->sg[host->pio.index];
408 sg_ptr = sg_virt(sg) + host->pio.offset;
409
410 /* This is the space left inside the buffer */
411 sg_len = data->sg[host->pio.index].length - host->pio.offset;
412
413 /* Check if we need less than the size of the sg_buffer */
414 max = (sg_len > host->pio.len) ? host->pio.len : sg_len;
415 if (max > AU1XMMC_MAX_TRANSFER)
416 max = AU1XMMC_MAX_TRANSFER;
417
418 for (count = 0; count < max; count++) {
419 status = __raw_readl(HOST_STATUS(host));
420
421 if (!(status & SD_STATUS_TH))
422 break;
423
424 val = *sg_ptr++;
425
426 __raw_writel((unsigned long)val, HOST_TXPORT(host));
427 wmb(); /* drain writebuffer */
428 }
429
430 host->pio.len -= count;
431 host->pio.offset += count;
432
433 if (count == sg_len) {
434 host->pio.index++;
435 host->pio.offset = 0;
436 }
437
438 if (host->pio.len == 0) {
439 IRQ_OFF(host, SD_CONFIG_TH);
440
441 if (host->flags & HOST_F_STOP)
442 SEND_STOP(host);
443
444 tasklet_schedule(&host->data_task);
445 }
446 }
447
448 static void au1xmmc_receive_pio(struct au1xmmc_host *host)
449 {
450 struct mmc_data *data;
451 int max, count, sg_len = 0;
452 unsigned char *sg_ptr = NULL;
453 u32 status, val;
454 struct scatterlist *sg;
455
456 data = host->mrq->data;
457
458 if (!(host->flags & HOST_F_RECV))
459 return;
460
461 max = host->pio.len;
462
463 if (host->pio.index < host->dma.len) {
464 sg = &data->sg[host->pio.index];
465 sg_ptr = sg_virt(sg) + host->pio.offset;
466
467 /* This is the space left inside the buffer */
468 sg_len = sg_dma_len(&data->sg[host->pio.index]) - host->pio.offset;
469
470 /* Check if we need less than the size of the sg_buffer */
471 if (sg_len < max)
472 max = sg_len;
473 }
474
475 if (max > AU1XMMC_MAX_TRANSFER)
476 max = AU1XMMC_MAX_TRANSFER;
477
478 for (count = 0; count < max; count++) {
479 status = __raw_readl(HOST_STATUS(host));
480
481 if (!(status & SD_STATUS_NE))
482 break;
483
484 if (status & SD_STATUS_RC) {
485 DBG("RX CRC Error [%d + %d].\n", host->pdev->id,
486 host->pio.len, count);
487 break;
488 }
489
490 if (status & SD_STATUS_RO) {
491 DBG("RX Overrun [%d + %d]\n", host->pdev->id,
492 host->pio.len, count);
493 break;
494 }
495 else if (status & SD_STATUS_RU) {
496 DBG("RX Underrun [%d + %d]\n", host->pdev->id,
497 host->pio.len, count);
498 break;
499 }
500
501 val = __raw_readl(HOST_RXPORT(host));
502
503 if (sg_ptr)
504 *sg_ptr++ = (unsigned char)(val & 0xFF);
505 }
506
507 host->pio.len -= count;
508 host->pio.offset += count;
509
510 if (sg_len && count == sg_len) {
511 host->pio.index++;
512 host->pio.offset = 0;
513 }
514
515 if (host->pio.len == 0) {
516 /* IRQ_OFF(host, SD_CONFIG_RA | SD_CONFIG_RF); */
517 IRQ_OFF(host, SD_CONFIG_NE);
518
519 if (host->flags & HOST_F_STOP)
520 SEND_STOP(host);
521
522 tasklet_schedule(&host->data_task);
523 }
524 }
525
526 /* This is called when a command has been completed - grab the response
527 * and check for errors. Then start the data transfer if it is indicated.
528 */
529 static void au1xmmc_cmd_complete(struct au1xmmc_host *host, u32 status)
530 {
531 struct mmc_request *mrq = host->mrq;
532 struct mmc_command *cmd;
533 u32 r[4];
534 int i, trans;
535
536 if (!host->mrq)
537 return;
538
539 cmd = mrq->cmd;
540 cmd->error = 0;
541
542 if (cmd->flags & MMC_RSP_PRESENT) {
543 if (cmd->flags & MMC_RSP_136) {
544 r[0] = __raw_readl(host->iobase + SD_RESP3);
545 r[1] = __raw_readl(host->iobase + SD_RESP2);
546 r[2] = __raw_readl(host->iobase + SD_RESP1);
547 r[3] = __raw_readl(host->iobase + SD_RESP0);
548
549 /* The CRC is omitted from the response, so really
550 * we only got 120 bytes, but the engine expects
551 * 128 bits, so we have to shift things up.
552 */
553 for (i = 0; i < 4; i++) {
554 cmd->resp[i] = (r[i] & 0x00FFFFFF) << 8;
555 if (i != 3)
556 cmd->resp[i] |= (r[i + 1] & 0xFF000000) >> 24;
557 }
558 } else {
559 /* Techincally, we should be getting all 48 bits of
560 * the response (SD_RESP1 + SD_RESP2), but because
561 * our response omits the CRC, our data ends up
562 * being shifted 8 bits to the right. In this case,
563 * that means that the OSR data starts at bit 31,
564 * so we can just read RESP0 and return that.
565 */
566 cmd->resp[0] = __raw_readl(host->iobase + SD_RESP0);
567 }
568 }
569
570 /* Figure out errors */
571 if (status & (SD_STATUS_SC | SD_STATUS_WC | SD_STATUS_RC))
572 cmd->error = -EILSEQ;
573
574 trans = host->flags & (HOST_F_XMIT | HOST_F_RECV);
575
576 if (!trans || cmd->error) {
577 IRQ_OFF(host, SD_CONFIG_TH | SD_CONFIG_RA | SD_CONFIG_RF);
578 tasklet_schedule(&host->finish_task);
579 return;
580 }
581
582 host->status = HOST_S_DATA;
583
584 if ((host->flags & (HOST_F_DMA | HOST_F_DBDMA))) {
585 u32 channel = DMA_CHANNEL(host);
586
587 /* Start the DBDMA as soon as the buffer gets something in it */
588
589 if (host->flags & HOST_F_RECV) {
590 u32 mask = SD_STATUS_DB | SD_STATUS_NE;
591
592 while((status & mask) != mask)
593 status = __raw_readl(HOST_STATUS(host));
594 }
595
596 au1xxx_dbdma_start(channel);
597 }
598 }
599
600 static void au1xmmc_set_clock(struct au1xmmc_host *host, int rate)
601 {
602 unsigned int pbus = clk_get_rate(host->clk);
603 unsigned int divisor = ((pbus / rate) / 2) - 1;
604 u32 config;
605
606 config = __raw_readl(HOST_CONFIG(host));
607
608 config &= ~(SD_CONFIG_DIV);
609 config |= (divisor & SD_CONFIG_DIV) | SD_CONFIG_DE;
610
611 __raw_writel(config, HOST_CONFIG(host));
612 wmb(); /* drain writebuffer */
613 }
614
615 static int au1xmmc_prepare_data(struct au1xmmc_host *host,
616 struct mmc_data *data)
617 {
618 int datalen = data->blocks * data->blksz;
619
620 if (data->flags & MMC_DATA_READ)
621 host->flags |= HOST_F_RECV;
622 else
623 host->flags |= HOST_F_XMIT;
624
625 if (host->mrq->stop)
626 host->flags |= HOST_F_STOP;
627
628 host->dma.dir = DMA_BIDIRECTIONAL;
629
630 host->dma.len = dma_map_sg(mmc_dev(host->mmc), data->sg,
631 data->sg_len, host->dma.dir);
632
633 if (host->dma.len == 0)
634 return -ETIMEDOUT;
635
636 __raw_writel(data->blksz - 1, HOST_BLKSIZE(host));
637
638 if (host->flags & (HOST_F_DMA | HOST_F_DBDMA)) {
639 int i;
640 u32 channel = DMA_CHANNEL(host);
641
642 au1xxx_dbdma_stop(channel);
643
644 for (i = 0; i < host->dma.len; i++) {
645 u32 ret = 0, flags = DDMA_FLAGS_NOIE;
646 struct scatterlist *sg = &data->sg[i];
647 int sg_len = sg->length;
648
649 int len = (datalen > sg_len) ? sg_len : datalen;
650
651 if (i == host->dma.len - 1)
652 flags = DDMA_FLAGS_IE;
653
654 if (host->flags & HOST_F_XMIT) {
655 ret = au1xxx_dbdma_put_source(channel,
656 sg_phys(sg), len, flags);
657 } else {
658 ret = au1xxx_dbdma_put_dest(channel,
659 sg_phys(sg), len, flags);
660 }
661
662 if (!ret)
663 goto dataerr;
664
665 datalen -= len;
666 }
667 } else {
668 host->pio.index = 0;
669 host->pio.offset = 0;
670 host->pio.len = datalen;
671
672 if (host->flags & HOST_F_XMIT)
673 IRQ_ON(host, SD_CONFIG_TH);
674 else
675 IRQ_ON(host, SD_CONFIG_NE);
676 /* IRQ_ON(host, SD_CONFIG_RA | SD_CONFIG_RF); */
677 }
678
679 return 0;
680
681 dataerr:
682 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
683 host->dma.dir);
684 return -ETIMEDOUT;
685 }
686
687 /* This actually starts a command or data transaction */
688 static void au1xmmc_request(struct mmc_host* mmc, struct mmc_request* mrq)
689 {
690 struct au1xmmc_host *host = mmc_priv(mmc);
691 int ret = 0;
692
693 WARN_ON(irqs_disabled());
694 WARN_ON(host->status != HOST_S_IDLE);
695
696 host->mrq = mrq;
697 host->status = HOST_S_CMD;
698
699 /* fail request immediately if no card is present */
700 if (0 == au1xmmc_card_inserted(mmc)) {
701 mrq->cmd->error = -ENOMEDIUM;
702 au1xmmc_finish_request(host);
703 return;
704 }
705
706 if (mrq->data) {
707 FLUSH_FIFO(host);
708 ret = au1xmmc_prepare_data(host, mrq->data);
709 }
710
711 if (!ret)
712 ret = au1xmmc_send_command(host, 0, mrq->cmd, mrq->data);
713
714 if (ret) {
715 mrq->cmd->error = ret;
716 au1xmmc_finish_request(host);
717 }
718 }
719
720 static void au1xmmc_reset_controller(struct au1xmmc_host *host)
721 {
722 /* Apply the clock */
723 __raw_writel(SD_ENABLE_CE, HOST_ENABLE(host));
724 wmb(); /* drain writebuffer */
725 mdelay(1);
726
727 __raw_writel(SD_ENABLE_R | SD_ENABLE_CE, HOST_ENABLE(host));
728 wmb(); /* drain writebuffer */
729 mdelay(5);
730
731 __raw_writel(~0, HOST_STATUS(host));
732 wmb(); /* drain writebuffer */
733
734 __raw_writel(0, HOST_BLKSIZE(host));
735 __raw_writel(0x001fffff, HOST_TIMEOUT(host));
736 wmb(); /* drain writebuffer */
737
738 __raw_writel(SD_CONFIG2_EN, HOST_CONFIG2(host));
739 wmb(); /* drain writebuffer */
740
741 __raw_writel(SD_CONFIG2_EN | SD_CONFIG2_FF, HOST_CONFIG2(host));
742 wmb(); /* drain writebuffer */
743 mdelay(1);
744
745 __raw_writel(SD_CONFIG2_EN, HOST_CONFIG2(host));
746 wmb(); /* drain writebuffer */
747
748 /* Configure interrupts */
749 __raw_writel(AU1XMMC_INTERRUPTS, HOST_CONFIG(host));
750 wmb(); /* drain writebuffer */
751 }
752
753
754 static void au1xmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
755 {
756 struct au1xmmc_host *host = mmc_priv(mmc);
757 u32 config2;
758
759 if (ios->power_mode == MMC_POWER_OFF)
760 au1xmmc_set_power(host, 0);
761 else if (ios->power_mode == MMC_POWER_ON) {
762 au1xmmc_set_power(host, 1);
763 }
764
765 if (ios->clock && ios->clock != host->clock) {
766 au1xmmc_set_clock(host, ios->clock);
767 host->clock = ios->clock;
768 }
769
770 config2 = __raw_readl(HOST_CONFIG2(host));
771 switch (ios->bus_width) {
772 case MMC_BUS_WIDTH_8:
773 config2 |= SD_CONFIG2_BB;
774 break;
775 case MMC_BUS_WIDTH_4:
776 config2 &= ~SD_CONFIG2_BB;
777 config2 |= SD_CONFIG2_WB;
778 break;
779 case MMC_BUS_WIDTH_1:
780 config2 &= ~(SD_CONFIG2_WB | SD_CONFIG2_BB);
781 break;
782 }
783 __raw_writel(config2, HOST_CONFIG2(host));
784 wmb(); /* drain writebuffer */
785 }
786
787 #define STATUS_TIMEOUT (SD_STATUS_RAT | SD_STATUS_DT)
788 #define STATUS_DATA_IN (SD_STATUS_NE)
789 #define STATUS_DATA_OUT (SD_STATUS_TH)
790
791 static irqreturn_t au1xmmc_irq(int irq, void *dev_id)
792 {
793 struct au1xmmc_host *host = dev_id;
794 u32 status;
795
796 status = __raw_readl(HOST_STATUS(host));
797
798 if (!(status & SD_STATUS_I))
799 return IRQ_NONE; /* not ours */
800
801 if (status & SD_STATUS_SI) /* SDIO */
802 mmc_signal_sdio_irq(host->mmc);
803
804 if (host->mrq && (status & STATUS_TIMEOUT)) {
805 if (status & SD_STATUS_RAT)
806 host->mrq->cmd->error = -ETIMEDOUT;
807 else if (status & SD_STATUS_DT)
808 host->mrq->data->error = -ETIMEDOUT;
809
810 /* In PIO mode, interrupts might still be enabled */
811 IRQ_OFF(host, SD_CONFIG_NE | SD_CONFIG_TH);
812
813 /* IRQ_OFF(host, SD_CONFIG_TH | SD_CONFIG_RA | SD_CONFIG_RF); */
814 tasklet_schedule(&host->finish_task);
815 }
816 #if 0
817 else if (status & SD_STATUS_DD) {
818 /* Sometimes we get a DD before a NE in PIO mode */
819 if (!(host->flags & HOST_F_DMA) && (status & SD_STATUS_NE))
820 au1xmmc_receive_pio(host);
821 else {
822 au1xmmc_data_complete(host, status);
823 /* tasklet_schedule(&host->data_task); */
824 }
825 }
826 #endif
827 else if (status & SD_STATUS_CR) {
828 if (host->status == HOST_S_CMD)
829 au1xmmc_cmd_complete(host, status);
830
831 } else if (!(host->flags & HOST_F_DMA)) {
832 if ((host->flags & HOST_F_XMIT) && (status & STATUS_DATA_OUT))
833 au1xmmc_send_pio(host);
834 else if ((host->flags & HOST_F_RECV) && (status & STATUS_DATA_IN))
835 au1xmmc_receive_pio(host);
836
837 } else if (status & 0x203F3C70) {
838 DBG("Unhandled status %8.8x\n", host->pdev->id,
839 status);
840 }
841
842 __raw_writel(status, HOST_STATUS(host));
843 wmb(); /* drain writebuffer */
844
845 return IRQ_HANDLED;
846 }
847
848 /* 8bit memory DMA device */
849 static dbdev_tab_t au1xmmc_mem_dbdev = {
850 .dev_id = DSCR_CMD0_ALWAYS,
851 .dev_flags = DEV_FLAGS_ANYUSE,
852 .dev_tsize = 0,
853 .dev_devwidth = 8,
854 .dev_physaddr = 0x00000000,
855 .dev_intlevel = 0,
856 .dev_intpolarity = 0,
857 };
858 static int memid;
859
860 static void au1xmmc_dbdma_callback(int irq, void *dev_id)
861 {
862 struct au1xmmc_host *host = (struct au1xmmc_host *)dev_id;
863
864 /* Avoid spurious interrupts */
865 if (!host->mrq)
866 return;
867
868 if (host->flags & HOST_F_STOP)
869 SEND_STOP(host);
870
871 tasklet_schedule(&host->data_task);
872 }
873
874 static int au1xmmc_dbdma_init(struct au1xmmc_host *host)
875 {
876 struct resource *res;
877 int txid, rxid;
878
879 res = platform_get_resource(host->pdev, IORESOURCE_DMA, 0);
880 if (!res)
881 return -ENODEV;
882 txid = res->start;
883
884 res = platform_get_resource(host->pdev, IORESOURCE_DMA, 1);
885 if (!res)
886 return -ENODEV;
887 rxid = res->start;
888
889 if (!memid)
890 return -ENODEV;
891
892 host->tx_chan = au1xxx_dbdma_chan_alloc(memid, txid,
893 au1xmmc_dbdma_callback, (void *)host);
894 if (!host->tx_chan) {
895 dev_err(&host->pdev->dev, "cannot allocate TX DMA\n");
896 return -ENODEV;
897 }
898
899 host->rx_chan = au1xxx_dbdma_chan_alloc(rxid, memid,
900 au1xmmc_dbdma_callback, (void *)host);
901 if (!host->rx_chan) {
902 dev_err(&host->pdev->dev, "cannot allocate RX DMA\n");
903 au1xxx_dbdma_chan_free(host->tx_chan);
904 return -ENODEV;
905 }
906
907 au1xxx_dbdma_set_devwidth(host->tx_chan, 8);
908 au1xxx_dbdma_set_devwidth(host->rx_chan, 8);
909
910 au1xxx_dbdma_ring_alloc(host->tx_chan, AU1XMMC_DESCRIPTOR_COUNT);
911 au1xxx_dbdma_ring_alloc(host->rx_chan, AU1XMMC_DESCRIPTOR_COUNT);
912
913 /* DBDMA is good to go */
914 host->flags |= HOST_F_DMA | HOST_F_DBDMA;
915
916 return 0;
917 }
918
919 static void au1xmmc_dbdma_shutdown(struct au1xmmc_host *host)
920 {
921 if (host->flags & HOST_F_DMA) {
922 host->flags &= ~HOST_F_DMA;
923 au1xxx_dbdma_chan_free(host->tx_chan);
924 au1xxx_dbdma_chan_free(host->rx_chan);
925 }
926 }
927
928 static void au1xmmc_enable_sdio_irq(struct mmc_host *mmc, int en)
929 {
930 struct au1xmmc_host *host = mmc_priv(mmc);
931
932 if (en)
933 IRQ_ON(host, SD_CONFIG_SI);
934 else
935 IRQ_OFF(host, SD_CONFIG_SI);
936 }
937
938 static const struct mmc_host_ops au1xmmc_ops = {
939 .request = au1xmmc_request,
940 .set_ios = au1xmmc_set_ios,
941 .get_ro = au1xmmc_card_readonly,
942 .get_cd = au1xmmc_card_inserted,
943 .enable_sdio_irq = au1xmmc_enable_sdio_irq,
944 };
945
946 static int au1xmmc_probe(struct platform_device *pdev)
947 {
948 struct mmc_host *mmc;
949 struct au1xmmc_host *host;
950 struct resource *r;
951 int ret, iflag;
952
953 mmc = mmc_alloc_host(sizeof(struct au1xmmc_host), &pdev->dev);
954 if (!mmc) {
955 dev_err(&pdev->dev, "no memory for mmc_host\n");
956 ret = -ENOMEM;
957 goto out0;
958 }
959
960 host = mmc_priv(mmc);
961 host->mmc = mmc;
962 host->platdata = pdev->dev.platform_data;
963 host->pdev = pdev;
964
965 ret = -ENODEV;
966 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
967 if (!r) {
968 dev_err(&pdev->dev, "no mmio defined\n");
969 goto out1;
970 }
971
972 host->ioarea = request_mem_region(r->start, resource_size(r),
973 pdev->name);
974 if (!host->ioarea) {
975 dev_err(&pdev->dev, "mmio already in use\n");
976 goto out1;
977 }
978
979 host->iobase = ioremap(r->start, 0x3c);
980 if (!host->iobase) {
981 dev_err(&pdev->dev, "cannot remap mmio\n");
982 goto out2;
983 }
984
985 r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
986 if (!r) {
987 dev_err(&pdev->dev, "no IRQ defined\n");
988 goto out3;
989 }
990 host->irq = r->start;
991
992 mmc->ops = &au1xmmc_ops;
993
994 mmc->f_min = 450000;
995 mmc->f_max = 24000000;
996
997 mmc->max_blk_size = 2048;
998 mmc->max_blk_count = 512;
999
1000 mmc->ocr_avail = AU1XMMC_OCR;
1001 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1002 mmc->max_segs = AU1XMMC_DESCRIPTOR_COUNT;
1003
1004 iflag = IRQF_SHARED; /* Au1100/Au1200: one int for both ctrls */
1005
1006 switch (alchemy_get_cputype()) {
1007 case ALCHEMY_CPU_AU1100:
1008 mmc->max_seg_size = AU1100_MMC_DESCRIPTOR_SIZE;
1009 break;
1010 case ALCHEMY_CPU_AU1200:
1011 mmc->max_seg_size = AU1200_MMC_DESCRIPTOR_SIZE;
1012 break;
1013 case ALCHEMY_CPU_AU1300:
1014 iflag = 0; /* nothing is shared */
1015 mmc->max_seg_size = AU1200_MMC_DESCRIPTOR_SIZE;
1016 mmc->f_max = 52000000;
1017 if (host->ioarea->start == AU1100_SD0_PHYS_ADDR)
1018 mmc->caps |= MMC_CAP_8_BIT_DATA;
1019 break;
1020 }
1021
1022 ret = request_irq(host->irq, au1xmmc_irq, iflag, DRIVER_NAME, host);
1023 if (ret) {
1024 dev_err(&pdev->dev, "cannot grab IRQ\n");
1025 goto out3;
1026 }
1027
1028 host->clk = clk_get(&pdev->dev, ALCHEMY_PERIPH_CLK);
1029 if (IS_ERR(host->clk)) {
1030 dev_err(&pdev->dev, "cannot find clock\n");
1031 ret = PTR_ERR(host->clk);
1032 goto out_irq;
1033 }
1034
1035 ret = clk_prepare_enable(host->clk);
1036 if (ret) {
1037 dev_err(&pdev->dev, "cannot enable clock\n");
1038 goto out_clk;
1039 }
1040
1041 host->status = HOST_S_IDLE;
1042
1043 /* board-specific carddetect setup, if any */
1044 if (host->platdata && host->platdata->cd_setup) {
1045 ret = host->platdata->cd_setup(mmc, 1);
1046 if (ret) {
1047 dev_warn(&pdev->dev, "board CD setup failed\n");
1048 mmc->caps |= MMC_CAP_NEEDS_POLL;
1049 }
1050 } else
1051 mmc->caps |= MMC_CAP_NEEDS_POLL;
1052
1053 /* platform may not be able to use all advertised caps */
1054 if (host->platdata)
1055 mmc->caps &= ~(host->platdata->mask_host_caps);
1056
1057 tasklet_init(&host->data_task, au1xmmc_tasklet_data,
1058 (unsigned long)host);
1059
1060 tasklet_init(&host->finish_task, au1xmmc_tasklet_finish,
1061 (unsigned long)host);
1062
1063 if (has_dbdma()) {
1064 ret = au1xmmc_dbdma_init(host);
1065 if (ret)
1066 pr_info(DRIVER_NAME ": DBDMA init failed; using PIO\n");
1067 }
1068
1069 #ifdef CONFIG_LEDS_CLASS
1070 if (host->platdata && host->platdata->led) {
1071 struct led_classdev *led = host->platdata->led;
1072 led->name = mmc_hostname(mmc);
1073 led->brightness = LED_OFF;
1074 led->default_trigger = mmc_hostname(mmc);
1075 ret = led_classdev_register(mmc_dev(mmc), led);
1076 if (ret)
1077 goto out5;
1078 }
1079 #endif
1080
1081 au1xmmc_reset_controller(host);
1082
1083 ret = mmc_add_host(mmc);
1084 if (ret) {
1085 dev_err(&pdev->dev, "cannot add mmc host\n");
1086 goto out6;
1087 }
1088
1089 platform_set_drvdata(pdev, host);
1090
1091 pr_info(DRIVER_NAME ": MMC Controller %d set up at %p"
1092 " (mode=%s)\n", pdev->id, host->iobase,
1093 host->flags & HOST_F_DMA ? "dma" : "pio");
1094
1095 return 0; /* all ok */
1096
1097 out6:
1098 #ifdef CONFIG_LEDS_CLASS
1099 if (host->platdata && host->platdata->led)
1100 led_classdev_unregister(host->platdata->led);
1101 out5:
1102 #endif
1103 __raw_writel(0, HOST_ENABLE(host));
1104 __raw_writel(0, HOST_CONFIG(host));
1105 __raw_writel(0, HOST_CONFIG2(host));
1106 wmb(); /* drain writebuffer */
1107
1108 if (host->flags & HOST_F_DBDMA)
1109 au1xmmc_dbdma_shutdown(host);
1110
1111 tasklet_kill(&host->data_task);
1112 tasklet_kill(&host->finish_task);
1113
1114 if (host->platdata && host->platdata->cd_setup &&
1115 !(mmc->caps & MMC_CAP_NEEDS_POLL))
1116 host->platdata->cd_setup(mmc, 0);
1117 out_clk:
1118 clk_disable_unprepare(host->clk);
1119 clk_put(host->clk);
1120 out_irq:
1121 free_irq(host->irq, host);
1122 out3:
1123 iounmap((void *)host->iobase);
1124 out2:
1125 release_resource(host->ioarea);
1126 kfree(host->ioarea);
1127 out1:
1128 mmc_free_host(mmc);
1129 out0:
1130 return ret;
1131 }
1132
1133 static int au1xmmc_remove(struct platform_device *pdev)
1134 {
1135 struct au1xmmc_host *host = platform_get_drvdata(pdev);
1136
1137 if (host) {
1138 mmc_remove_host(host->mmc);
1139
1140 #ifdef CONFIG_LEDS_CLASS
1141 if (host->platdata && host->platdata->led)
1142 led_classdev_unregister(host->platdata->led);
1143 #endif
1144
1145 if (host->platdata && host->platdata->cd_setup &&
1146 !(host->mmc->caps & MMC_CAP_NEEDS_POLL))
1147 host->platdata->cd_setup(host->mmc, 0);
1148
1149 __raw_writel(0, HOST_ENABLE(host));
1150 __raw_writel(0, HOST_CONFIG(host));
1151 __raw_writel(0, HOST_CONFIG2(host));
1152 wmb(); /* drain writebuffer */
1153
1154 tasklet_kill(&host->data_task);
1155 tasklet_kill(&host->finish_task);
1156
1157 if (host->flags & HOST_F_DBDMA)
1158 au1xmmc_dbdma_shutdown(host);
1159
1160 au1xmmc_set_power(host, 0);
1161
1162 clk_disable_unprepare(host->clk);
1163 clk_put(host->clk);
1164
1165 free_irq(host->irq, host);
1166 iounmap((void *)host->iobase);
1167 release_resource(host->ioarea);
1168 kfree(host->ioarea);
1169
1170 mmc_free_host(host->mmc);
1171 }
1172 return 0;
1173 }
1174
1175 #ifdef CONFIG_PM
1176 static int au1xmmc_suspend(struct platform_device *pdev, pm_message_t state)
1177 {
1178 struct au1xmmc_host *host = platform_get_drvdata(pdev);
1179
1180 __raw_writel(0, HOST_CONFIG2(host));
1181 __raw_writel(0, HOST_CONFIG(host));
1182 __raw_writel(0xffffffff, HOST_STATUS(host));
1183 __raw_writel(0, HOST_ENABLE(host));
1184 wmb(); /* drain writebuffer */
1185
1186 return 0;
1187 }
1188
1189 static int au1xmmc_resume(struct platform_device *pdev)
1190 {
1191 struct au1xmmc_host *host = platform_get_drvdata(pdev);
1192
1193 au1xmmc_reset_controller(host);
1194
1195 return 0;
1196 }
1197 #else
1198 #define au1xmmc_suspend NULL
1199 #define au1xmmc_resume NULL
1200 #endif
1201
1202 static struct platform_driver au1xmmc_driver = {
1203 .probe = au1xmmc_probe,
1204 .remove = au1xmmc_remove,
1205 .suspend = au1xmmc_suspend,
1206 .resume = au1xmmc_resume,
1207 .driver = {
1208 .name = DRIVER_NAME,
1209 },
1210 };
1211
1212 static int __init au1xmmc_init(void)
1213 {
1214 if (has_dbdma()) {
1215 /* DSCR_CMD0_ALWAYS has a stride of 32 bits, we need a stride
1216 * of 8 bits. And since devices are shared, we need to create
1217 * our own to avoid freaking out other devices.
1218 */
1219 memid = au1xxx_ddma_add_device(&au1xmmc_mem_dbdev);
1220 if (!memid)
1221 pr_err("au1xmmc: cannot add memory dbdma\n");
1222 }
1223 return platform_driver_register(&au1xmmc_driver);
1224 }
1225
1226 static void __exit au1xmmc_exit(void)
1227 {
1228 if (has_dbdma() && memid)
1229 au1xxx_ddma_del_device(memid);
1230
1231 platform_driver_unregister(&au1xmmc_driver);
1232 }
1233
1234 module_init(au1xmmc_init);
1235 module_exit(au1xmmc_exit);
1236
1237 MODULE_AUTHOR("Advanced Micro Devices, Inc");
1238 MODULE_DESCRIPTION("MMC/SD driver for the Alchemy Au1XXX");
1239 MODULE_LICENSE("GPL");
1240 MODULE_ALIAS("platform:au1xxx-mmc");
Linux with added FPC-III support