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ba264b34 PP |
1 | /* |
2 | * linux/drivers/mmc/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 is a timer used to detect insert events? | |
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 | * So we use the timer to check the status manually. | |
35 | */ | |
36 | ||
37 | #include <linux/config.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/device.h> | |
41 | #include <linux/mm.h> | |
42 | #include <linux/interrupt.h> | |
43 | #include <linux/dma-mapping.h> | |
44 | ||
45 | #include <linux/mmc/host.h> | |
46 | #include <linux/mmc/protocol.h> | |
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 | #include <asm/scatterlist.h> | |
52 | ||
53 | #include <au1xxx.h> | |
54 | #include "au1xmmc.h" | |
55 | ||
56 | #define DRIVER_NAME "au1xxx-mmc" | |
57 | ||
58 | /* Set this to enable special debugging macros */ | |
59 | /* #define MMC_DEBUG */ | |
60 | ||
61 | #ifdef MMC_DEBUG | |
62 | #define DEBUG(fmt, idx, args...) printk("au1xx(%d): DEBUG: " fmt, idx, ##args) | |
63 | #else | |
64 | #define DEBUG(fmt, idx, args...) | |
65 | #endif | |
66 | ||
67 | const struct { | |
68 | u32 iobase; | |
69 | u32 tx_devid, rx_devid; | |
70 | u16 bcsrpwr; | |
71 | u16 bcsrstatus; | |
72 | u16 wpstatus; | |
73 | } au1xmmc_card_table[] = { | |
74 | { SD0_BASE, DSCR_CMD0_SDMS_TX0, DSCR_CMD0_SDMS_RX0, | |
75 | BCSR_BOARD_SD0PWR, BCSR_INT_SD0INSERT, BCSR_STATUS_SD0WP }, | |
76 | #ifndef CONFIG_MIPS_DB1200 | |
77 | { SD1_BASE, DSCR_CMD0_SDMS_TX1, DSCR_CMD0_SDMS_RX1, | |
78 | BCSR_BOARD_DS1PWR, BCSR_INT_SD1INSERT, BCSR_STATUS_SD1WP } | |
79 | #endif | |
80 | }; | |
81 | ||
82 | #define AU1XMMC_CONTROLLER_COUNT \ | |
83 | (sizeof(au1xmmc_card_table) / sizeof(au1xmmc_card_table[0])) | |
84 | ||
85 | /* This array stores pointers for the hosts (used by the IRQ handler) */ | |
86 | struct au1xmmc_host *au1xmmc_hosts[AU1XMMC_CONTROLLER_COUNT]; | |
87 | static int dma = 1; | |
88 | ||
89 | #ifdef MODULE | |
90 | MODULE_PARM(dma, "i"); | |
91 | MODULE_PARM_DESC(dma, "Use DMA engine for data transfers (0 = disabled)"); | |
92 | #endif | |
93 | ||
94 | static inline void IRQ_ON(struct au1xmmc_host *host, u32 mask) | |
95 | { | |
96 | u32 val = au_readl(HOST_CONFIG(host)); | |
97 | val |= mask; | |
98 | au_writel(val, HOST_CONFIG(host)); | |
99 | au_sync(); | |
100 | } | |
101 | ||
102 | static inline void FLUSH_FIFO(struct au1xmmc_host *host) | |
103 | { | |
104 | u32 val = au_readl(HOST_CONFIG2(host)); | |
105 | ||
106 | au_writel(val | SD_CONFIG2_FF, HOST_CONFIG2(host)); | |
107 | au_sync_delay(1); | |
108 | ||
109 | /* SEND_STOP will turn off clock control - this re-enables it */ | |
110 | val &= ~SD_CONFIG2_DF; | |
111 | ||
112 | au_writel(val, HOST_CONFIG2(host)); | |
113 | au_sync(); | |
114 | } | |
115 | ||
116 | static inline void IRQ_OFF(struct au1xmmc_host *host, u32 mask) | |
117 | { | |
118 | u32 val = au_readl(HOST_CONFIG(host)); | |
119 | val &= ~mask; | |
120 | au_writel(val, HOST_CONFIG(host)); | |
121 | au_sync(); | |
122 | } | |
123 | ||
124 | static inline void SEND_STOP(struct au1xmmc_host *host) | |
125 | { | |
126 | ||
127 | /* We know the value of CONFIG2, so avoid a read we don't need */ | |
128 | u32 mask = SD_CONFIG2_EN; | |
129 | ||
130 | WARN_ON(host->status != HOST_S_DATA); | |
131 | host->status = HOST_S_STOP; | |
132 | ||
133 | au_writel(mask | SD_CONFIG2_DF, HOST_CONFIG2(host)); | |
134 | au_sync(); | |
135 | ||
136 | /* Send the stop commmand */ | |
137 | au_writel(STOP_CMD, HOST_CMD(host)); | |
138 | } | |
139 | ||
140 | static void au1xmmc_set_power(struct au1xmmc_host *host, int state) | |
141 | { | |
142 | ||
143 | u32 val = au1xmmc_card_table[host->id].bcsrpwr; | |
144 | ||
145 | bcsr->board &= ~val; | |
146 | if (state) bcsr->board |= val; | |
147 | ||
148 | au_sync_delay(1); | |
149 | } | |
150 | ||
151 | static inline int au1xmmc_card_inserted(struct au1xmmc_host *host) | |
152 | { | |
153 | return (bcsr->sig_status & au1xmmc_card_table[host->id].bcsrstatus) | |
154 | ? 1 : 0; | |
155 | } | |
156 | ||
157 | static inline int au1xmmc_card_readonly(struct au1xmmc_host *host) | |
158 | { | |
159 | return (bcsr->status & au1xmmc_card_table[host->id].wpstatus) | |
160 | ? 1 : 0; | |
161 | } | |
162 | ||
163 | static void au1xmmc_finish_request(struct au1xmmc_host *host) | |
164 | { | |
165 | ||
166 | struct mmc_request *mrq = host->mrq; | |
167 | ||
168 | host->mrq = NULL; | |
169 | host->flags &= HOST_F_ACTIVE; | |
170 | ||
171 | host->dma.len = 0; | |
172 | host->dma.dir = 0; | |
173 | ||
174 | host->pio.index = 0; | |
175 | host->pio.offset = 0; | |
176 | host->pio.len = 0; | |
177 | ||
178 | host->status = HOST_S_IDLE; | |
179 | ||
180 | bcsr->disk_leds |= (1 << 8); | |
181 | ||
182 | mmc_request_done(host->mmc, mrq); | |
183 | } | |
184 | ||
185 | static void au1xmmc_tasklet_finish(unsigned long param) | |
186 | { | |
187 | struct au1xmmc_host *host = (struct au1xmmc_host *) param; | |
188 | au1xmmc_finish_request(host); | |
189 | } | |
190 | ||
191 | static int au1xmmc_send_command(struct au1xmmc_host *host, int wait, | |
192 | struct mmc_command *cmd) | |
193 | { | |
194 | ||
195 | u32 mmccmd = (cmd->opcode << SD_CMD_CI_SHIFT); | |
196 | ||
197 | switch(cmd->flags) { | |
198 | case MMC_RSP_R1: | |
199 | mmccmd |= SD_CMD_RT_1; | |
200 | break; | |
201 | case MMC_RSP_R1B: | |
202 | mmccmd |= SD_CMD_RT_1B; | |
203 | break; | |
204 | case MMC_RSP_R2: | |
205 | mmccmd |= SD_CMD_RT_2; | |
206 | break; | |
207 | case MMC_RSP_R3: | |
208 | mmccmd |= SD_CMD_RT_3; | |
209 | break; | |
210 | } | |
211 | ||
212 | switch(cmd->opcode) { | |
213 | case MMC_READ_SINGLE_BLOCK: | |
214 | case SD_APP_SEND_SCR: | |
215 | mmccmd |= SD_CMD_CT_2; | |
216 | break; | |
217 | case MMC_READ_MULTIPLE_BLOCK: | |
218 | mmccmd |= SD_CMD_CT_4; | |
219 | break; | |
220 | case MMC_WRITE_BLOCK: | |
221 | mmccmd |= SD_CMD_CT_1; | |
222 | break; | |
223 | ||
224 | case MMC_WRITE_MULTIPLE_BLOCK: | |
225 | mmccmd |= SD_CMD_CT_3; | |
226 | break; | |
227 | case MMC_STOP_TRANSMISSION: | |
228 | mmccmd |= SD_CMD_CT_7; | |
229 | break; | |
230 | } | |
231 | ||
232 | au_writel(cmd->arg, HOST_CMDARG(host)); | |
233 | au_sync(); | |
234 | ||
235 | if (wait) | |
236 | IRQ_OFF(host, SD_CONFIG_CR); | |
237 | ||
238 | au_writel((mmccmd | SD_CMD_GO), HOST_CMD(host)); | |
239 | au_sync(); | |
240 | ||
241 | /* Wait for the command to go on the line */ | |
242 | ||
243 | while(1) { | |
244 | if (!(au_readl(HOST_CMD(host)) & SD_CMD_GO)) | |
245 | break; | |
246 | } | |
247 | ||
248 | /* Wait for the command to come back */ | |
249 | ||
250 | if (wait) { | |
251 | u32 status = au_readl(HOST_STATUS(host)); | |
252 | ||
253 | while(!(status & SD_STATUS_CR)) | |
254 | status = au_readl(HOST_STATUS(host)); | |
255 | ||
256 | /* Clear the CR status */ | |
257 | au_writel(SD_STATUS_CR, HOST_STATUS(host)); | |
258 | ||
259 | IRQ_ON(host, SD_CONFIG_CR); | |
260 | } | |
261 | ||
262 | return MMC_ERR_NONE; | |
263 | } | |
264 | ||
265 | static void au1xmmc_data_complete(struct au1xmmc_host *host, u32 status) | |
266 | { | |
267 | ||
268 | struct mmc_request *mrq = host->mrq; | |
269 | struct mmc_data *data; | |
270 | u32 crc; | |
271 | ||
272 | WARN_ON(host->status != HOST_S_DATA && host->status != HOST_S_STOP); | |
273 | ||
274 | if (host->mrq == NULL) | |
275 | return; | |
276 | ||
277 | data = mrq->cmd->data; | |
278 | ||
279 | if (status == 0) | |
280 | status = au_readl(HOST_STATUS(host)); | |
281 | ||
282 | /* The transaction is really over when the SD_STATUS_DB bit is clear */ | |
283 | ||
284 | while((host->flags & HOST_F_XMIT) && (status & SD_STATUS_DB)) | |
285 | status = au_readl(HOST_STATUS(host)); | |
286 | ||
287 | data->error = MMC_ERR_NONE; | |
288 | dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, host->dma.dir); | |
289 | ||
290 | /* Process any errors */ | |
291 | ||
292 | crc = (status & (SD_STATUS_WC | SD_STATUS_RC)); | |
293 | if (host->flags & HOST_F_XMIT) | |
294 | crc |= ((status & 0x07) == 0x02) ? 0 : 1; | |
295 | ||
296 | if (crc) | |
297 | data->error = MMC_ERR_BADCRC; | |
298 | ||
299 | /* Clear the CRC bits */ | |
300 | au_writel(SD_STATUS_WC | SD_STATUS_RC, HOST_STATUS(host)); | |
301 | ||
302 | data->bytes_xfered = 0; | |
303 | ||
304 | if (data->error == MMC_ERR_NONE) { | |
305 | if (host->flags & HOST_F_DMA) { | |
306 | u32 chan = DMA_CHANNEL(host); | |
307 | ||
308 | chan_tab_t *c = *((chan_tab_t **) chan); | |
309 | au1x_dma_chan_t *cp = c->chan_ptr; | |
310 | data->bytes_xfered = cp->ddma_bytecnt; | |
311 | } | |
312 | else | |
313 | data->bytes_xfered = | |
314 | (data->blocks * (1 << data->blksz_bits)) - | |
315 | host->pio.len; | |
316 | } | |
317 | ||
318 | au1xmmc_finish_request(host); | |
319 | } | |
320 | ||
321 | static void au1xmmc_tasklet_data(unsigned long param) | |
322 | { | |
323 | struct au1xmmc_host *host = (struct au1xmmc_host *) param; | |
324 | ||
325 | u32 status = au_readl(HOST_STATUS(host)); | |
326 | au1xmmc_data_complete(host, status); | |
327 | } | |
328 | ||
329 | #define AU1XMMC_MAX_TRANSFER 8 | |
330 | ||
331 | static void au1xmmc_send_pio(struct au1xmmc_host *host) | |
332 | { | |
333 | ||
334 | struct mmc_data *data = 0; | |
335 | int sg_len, max, count = 0; | |
336 | unsigned char *sg_ptr; | |
337 | u32 status = 0; | |
338 | struct scatterlist *sg; | |
339 | ||
340 | data = host->mrq->data; | |
341 | ||
342 | if (!(host->flags & HOST_F_XMIT)) | |
343 | return; | |
344 | ||
345 | /* This is the pointer to the data buffer */ | |
346 | sg = &data->sg[host->pio.index]; | |
347 | sg_ptr = page_address(sg->page) + sg->offset + host->pio.offset; | |
348 | ||
349 | /* This is the space left inside the buffer */ | |
350 | sg_len = data->sg[host->pio.index].length - host->pio.offset; | |
351 | ||
352 | /* Check to if we need less then the size of the sg_buffer */ | |
353 | ||
354 | max = (sg_len > host->pio.len) ? host->pio.len : sg_len; | |
355 | if (max > AU1XMMC_MAX_TRANSFER) max = AU1XMMC_MAX_TRANSFER; | |
356 | ||
357 | for(count = 0; count < max; count++ ) { | |
358 | unsigned char val; | |
359 | ||
360 | status = au_readl(HOST_STATUS(host)); | |
361 | ||
362 | if (!(status & SD_STATUS_TH)) | |
363 | break; | |
364 | ||
365 | val = *sg_ptr++; | |
366 | ||
367 | au_writel((unsigned long) val, HOST_TXPORT(host)); | |
368 | au_sync(); | |
369 | } | |
370 | ||
371 | host->pio.len -= count; | |
372 | host->pio.offset += count; | |
373 | ||
374 | if (count == sg_len) { | |
375 | host->pio.index++; | |
376 | host->pio.offset = 0; | |
377 | } | |
378 | ||
379 | if (host->pio.len == 0) { | |
380 | IRQ_OFF(host, SD_CONFIG_TH); | |
381 | ||
382 | if (host->flags & HOST_F_STOP) | |
383 | SEND_STOP(host); | |
384 | ||
385 | tasklet_schedule(&host->data_task); | |
386 | } | |
387 | } | |
388 | ||
389 | static void au1xmmc_receive_pio(struct au1xmmc_host *host) | |
390 | { | |
391 | ||
392 | struct mmc_data *data = 0; | |
393 | int sg_len = 0, max = 0, count = 0; | |
394 | unsigned char *sg_ptr = 0; | |
395 | u32 status = 0; | |
396 | struct scatterlist *sg; | |
397 | ||
398 | data = host->mrq->data; | |
399 | ||
400 | if (!(host->flags & HOST_F_RECV)) | |
401 | return; | |
402 | ||
403 | max = host->pio.len; | |
404 | ||
405 | if (host->pio.index < host->dma.len) { | |
406 | sg = &data->sg[host->pio.index]; | |
407 | sg_ptr = page_address(sg->page) + sg->offset + host->pio.offset; | |
408 | ||
409 | /* This is the space left inside the buffer */ | |
410 | sg_len = sg_dma_len(&data->sg[host->pio.index]) - host->pio.offset; | |
411 | ||
412 | /* Check to if we need less then the size of the sg_buffer */ | |
413 | if (sg_len < max) max = sg_len; | |
414 | } | |
415 | ||
416 | if (max > AU1XMMC_MAX_TRANSFER) | |
417 | max = AU1XMMC_MAX_TRANSFER; | |
418 | ||
419 | for(count = 0; count < max; count++ ) { | |
420 | u32 val; | |
421 | status = au_readl(HOST_STATUS(host)); | |
422 | ||
423 | if (!(status & SD_STATUS_NE)) | |
424 | break; | |
425 | ||
426 | if (status & SD_STATUS_RC) { | |
427 | DEBUG("RX CRC Error [%d + %d].\n", host->id, | |
428 | host->pio.len, count); | |
429 | break; | |
430 | } | |
431 | ||
432 | if (status & SD_STATUS_RO) { | |
433 | DEBUG("RX Overrun [%d + %d]\n", host->id, | |
434 | host->pio.len, count); | |
435 | break; | |
436 | } | |
437 | else if (status & SD_STATUS_RU) { | |
438 | DEBUG("RX Underrun [%d + %d]\n", host->id, | |
439 | host->pio.len, count); | |
440 | break; | |
441 | } | |
442 | ||
443 | val = au_readl(HOST_RXPORT(host)); | |
444 | ||
445 | if (sg_ptr) | |
446 | *sg_ptr++ = (unsigned char) (val & 0xFF); | |
447 | } | |
448 | ||
449 | host->pio.len -= count; | |
450 | host->pio.offset += count; | |
451 | ||
452 | if (sg_len && count == sg_len) { | |
453 | host->pio.index++; | |
454 | host->pio.offset = 0; | |
455 | } | |
456 | ||
457 | if (host->pio.len == 0) { | |
458 | //IRQ_OFF(host, SD_CONFIG_RA | SD_CONFIG_RF); | |
459 | IRQ_OFF(host, SD_CONFIG_NE); | |
460 | ||
461 | if (host->flags & HOST_F_STOP) | |
462 | SEND_STOP(host); | |
463 | ||
464 | tasklet_schedule(&host->data_task); | |
465 | } | |
466 | } | |
467 | ||
468 | /* static void au1xmmc_cmd_complete | |
469 | This is called when a command has been completed - grab the response | |
470 | and check for errors. Then start the data transfer if it is indicated. | |
471 | */ | |
472 | ||
473 | static void au1xmmc_cmd_complete(struct au1xmmc_host *host, u32 status) | |
474 | { | |
475 | ||
476 | struct mmc_request *mrq = host->mrq; | |
477 | struct mmc_command *cmd; | |
478 | int trans; | |
479 | ||
480 | if (!host->mrq) | |
481 | return; | |
482 | ||
483 | cmd = mrq->cmd; | |
484 | cmd->error = MMC_ERR_NONE; | |
485 | ||
486 | if ((cmd->flags & MMC_RSP_MASK) == MMC_RSP_SHORT) { | |
487 | ||
488 | /* Techincally, we should be getting all 48 bits of the response | |
489 | * (SD_RESP1 + SD_RESP2), but because our response omits the CRC, | |
490 | * our data ends up being shifted 8 bits to the right. In this case, | |
491 | * that means that the OSR data starts at bit 31, so we can just | |
492 | * read RESP0 and return that | |
493 | */ | |
494 | ||
495 | cmd->resp[0] = au_readl(host->iobase + SD_RESP0); | |
496 | } | |
497 | else if ((cmd->flags & MMC_RSP_MASK) == MMC_RSP_LONG) { | |
498 | u32 r[4]; | |
499 | int i; | |
500 | ||
501 | r[0] = au_readl(host->iobase + SD_RESP3); | |
502 | r[1] = au_readl(host->iobase + SD_RESP2); | |
503 | r[2] = au_readl(host->iobase + SD_RESP1); | |
504 | r[3] = au_readl(host->iobase + SD_RESP0); | |
505 | ||
506 | /* The CRC is omitted from the response, so really we only got | |
507 | * 120 bytes, but the engine expects 128 bits, so we have to shift | |
508 | * things up | |
509 | */ | |
510 | ||
511 | for(i = 0; i < 4; i++) { | |
512 | cmd->resp[i] = (r[i] & 0x00FFFFFF) << 8; | |
513 | if (i != 3) cmd->resp[i] |= (r[i + 1] & 0xFF000000) >> 24; | |
514 | } | |
515 | } | |
516 | ||
517 | /* Figure out errors */ | |
518 | ||
519 | if (status & (SD_STATUS_SC | SD_STATUS_WC | SD_STATUS_RC)) | |
520 | cmd->error = MMC_ERR_BADCRC; | |
521 | ||
522 | trans = host->flags & (HOST_F_XMIT | HOST_F_RECV); | |
523 | ||
524 | if (!trans || cmd->error != MMC_ERR_NONE) { | |
525 | ||
526 | IRQ_OFF(host, SD_CONFIG_TH | SD_CONFIG_RA|SD_CONFIG_RF); | |
527 | tasklet_schedule(&host->finish_task); | |
528 | return; | |
529 | } | |
530 | ||
531 | host->status = HOST_S_DATA; | |
532 | ||
533 | if (host->flags & HOST_F_DMA) { | |
534 | u32 channel = DMA_CHANNEL(host); | |
535 | ||
536 | /* Start the DMA as soon as the buffer gets something in it */ | |
537 | ||
538 | if (host->flags & HOST_F_RECV) { | |
539 | u32 mask = SD_STATUS_DB | SD_STATUS_NE; | |
540 | ||
541 | while((status & mask) != mask) | |
542 | status = au_readl(HOST_STATUS(host)); | |
543 | } | |
544 | ||
545 | au1xxx_dbdma_start(channel); | |
546 | } | |
547 | } | |
548 | ||
549 | static void au1xmmc_set_clock(struct au1xmmc_host *host, int rate) | |
550 | { | |
551 | ||
552 | unsigned int pbus = get_au1x00_speed(); | |
553 | unsigned int divisor; | |
554 | u32 config; | |
555 | ||
556 | /* From databook: | |
557 | divisor = ((((cpuclock / sbus_divisor) / 2) / mmcclock) / 2) - 1 | |
558 | */ | |
559 | ||
560 | pbus /= ((au_readl(SYS_POWERCTRL) & 0x3) + 2); | |
561 | pbus /= 2; | |
562 | ||
563 | divisor = ((pbus / rate) / 2) - 1; | |
564 | ||
565 | config = au_readl(HOST_CONFIG(host)); | |
566 | ||
567 | config &= ~(SD_CONFIG_DIV); | |
568 | config |= (divisor & SD_CONFIG_DIV) | SD_CONFIG_DE; | |
569 | ||
570 | au_writel(config, HOST_CONFIG(host)); | |
571 | au_sync(); | |
572 | } | |
573 | ||
574 | static int | |
575 | au1xmmc_prepare_data(struct au1xmmc_host *host, struct mmc_data *data) | |
576 | { | |
577 | ||
578 | int datalen = data->blocks * (1 << data->blksz_bits); | |
579 | ||
580 | if (dma != 0) | |
581 | host->flags |= HOST_F_DMA; | |
582 | ||
583 | if (data->flags & MMC_DATA_READ) | |
584 | host->flags |= HOST_F_RECV; | |
585 | else | |
586 | host->flags |= HOST_F_XMIT; | |
587 | ||
588 | if (host->mrq->stop) | |
589 | host->flags |= HOST_F_STOP; | |
590 | ||
591 | host->dma.dir = DMA_BIDIRECTIONAL; | |
592 | ||
593 | host->dma.len = dma_map_sg(mmc_dev(host->mmc), data->sg, | |
594 | data->sg_len, host->dma.dir); | |
595 | ||
596 | if (host->dma.len == 0) | |
597 | return MMC_ERR_TIMEOUT; | |
598 | ||
599 | au_writel((1 << data->blksz_bits) - 1, HOST_BLKSIZE(host)); | |
600 | ||
601 | if (host->flags & HOST_F_DMA) { | |
602 | int i; | |
603 | u32 channel = DMA_CHANNEL(host); | |
604 | ||
605 | au1xxx_dbdma_stop(channel); | |
606 | ||
607 | for(i = 0; i < host->dma.len; i++) { | |
608 | u32 ret = 0, flags = DDMA_FLAGS_NOIE; | |
609 | struct scatterlist *sg = &data->sg[i]; | |
610 | int sg_len = sg->length; | |
611 | ||
612 | int len = (datalen > sg_len) ? sg_len : datalen; | |
613 | ||
614 | if (i == host->dma.len - 1) | |
615 | flags = DDMA_FLAGS_IE; | |
616 | ||
617 | if (host->flags & HOST_F_XMIT){ | |
618 | ret = au1xxx_dbdma_put_source_flags(channel, | |
619 | (void *) (page_address(sg->page) + | |
620 | sg->offset), | |
621 | len, flags); | |
622 | } | |
623 | else { | |
624 | ret = au1xxx_dbdma_put_dest_flags(channel, | |
625 | (void *) (page_address(sg->page) + | |
626 | sg->offset), | |
627 | len, flags); | |
628 | } | |
629 | ||
630 | if (!ret) | |
631 | goto dataerr; | |
632 | ||
633 | datalen -= len; | |
634 | } | |
635 | } | |
636 | else { | |
637 | host->pio.index = 0; | |
638 | host->pio.offset = 0; | |
639 | host->pio.len = datalen; | |
640 | ||
641 | if (host->flags & HOST_F_XMIT) | |
642 | IRQ_ON(host, SD_CONFIG_TH); | |
643 | else | |
644 | IRQ_ON(host, SD_CONFIG_NE); | |
645 | //IRQ_ON(host, SD_CONFIG_RA|SD_CONFIG_RF); | |
646 | } | |
647 | ||
648 | return MMC_ERR_NONE; | |
649 | ||
650 | dataerr: | |
651 | dma_unmap_sg(mmc_dev(host->mmc),data->sg,data->sg_len,host->dma.dir); | |
652 | return MMC_ERR_TIMEOUT; | |
653 | } | |
654 | ||
655 | /* static void au1xmmc_request | |
656 | This actually starts a command or data transaction | |
657 | */ | |
658 | ||
659 | static void au1xmmc_request(struct mmc_host* mmc, struct mmc_request* mrq) | |
660 | { | |
661 | ||
662 | struct au1xmmc_host *host = mmc_priv(mmc); | |
663 | int ret = MMC_ERR_NONE; | |
664 | ||
665 | WARN_ON(irqs_disabled()); | |
666 | WARN_ON(host->status != HOST_S_IDLE); | |
667 | ||
668 | host->mrq = mrq; | |
669 | host->status = HOST_S_CMD; | |
670 | ||
671 | bcsr->disk_leds &= ~(1 << 8); | |
672 | ||
673 | if (mrq->data) { | |
674 | FLUSH_FIFO(host); | |
675 | ret = au1xmmc_prepare_data(host, mrq->data); | |
676 | } | |
677 | ||
678 | if (ret == MMC_ERR_NONE) | |
679 | ret = au1xmmc_send_command(host, 0, mrq->cmd); | |
680 | ||
681 | if (ret != MMC_ERR_NONE) { | |
682 | mrq->cmd->error = ret; | |
683 | au1xmmc_finish_request(host); | |
684 | } | |
685 | } | |
686 | ||
687 | static void au1xmmc_reset_controller(struct au1xmmc_host *host) | |
688 | { | |
689 | ||
690 | /* Apply the clock */ | |
691 | au_writel(SD_ENABLE_CE, HOST_ENABLE(host)); | |
692 | au_sync_delay(1); | |
693 | ||
694 | au_writel(SD_ENABLE_R | SD_ENABLE_CE, HOST_ENABLE(host)); | |
695 | au_sync_delay(5); | |
696 | ||
697 | au_writel(~0, HOST_STATUS(host)); | |
698 | au_sync(); | |
699 | ||
700 | au_writel(0, HOST_BLKSIZE(host)); | |
701 | au_writel(0x001fffff, HOST_TIMEOUT(host)); | |
702 | au_sync(); | |
703 | ||
704 | au_writel(SD_CONFIG2_EN, HOST_CONFIG2(host)); | |
705 | au_sync(); | |
706 | ||
707 | au_writel(SD_CONFIG2_EN | SD_CONFIG2_FF, HOST_CONFIG2(host)); | |
708 | au_sync_delay(1); | |
709 | ||
710 | au_writel(SD_CONFIG2_EN, HOST_CONFIG2(host)); | |
711 | au_sync(); | |
712 | ||
713 | /* Configure interrupts */ | |
714 | au_writel(AU1XMMC_INTERRUPTS, HOST_CONFIG(host)); | |
715 | au_sync(); | |
716 | } | |
717 | ||
718 | ||
719 | static void au1xmmc_set_ios(struct mmc_host* mmc, struct mmc_ios* ios) | |
720 | { | |
721 | struct au1xmmc_host *host = mmc_priv(mmc); | |
722 | ||
723 | DEBUG("set_ios (power=%u, clock=%uHz, vdd=%u, mode=%u)\n", | |
724 | host->id, ios->power_mode, ios->clock, ios->vdd, | |
725 | ios->bus_mode); | |
726 | ||
727 | if (ios->power_mode == MMC_POWER_OFF) | |
728 | au1xmmc_set_power(host, 0); | |
729 | else if (ios->power_mode == MMC_POWER_ON) { | |
730 | au1xmmc_set_power(host, 1); | |
731 | } | |
732 | ||
733 | if (ios->clock && ios->clock != host->clock) { | |
734 | au1xmmc_set_clock(host, ios->clock); | |
735 | host->clock = ios->clock; | |
736 | } | |
737 | } | |
738 | ||
739 | static void au1xmmc_dma_callback(int irq, void *dev_id, struct pt_regs *regs) | |
740 | { | |
741 | struct au1xmmc_host *host = (struct au1xmmc_host *) dev_id; | |
742 | u32 status; | |
743 | ||
744 | /* Avoid spurious interrupts */ | |
745 | ||
746 | if (!host->mrq) | |
747 | return; | |
748 | ||
749 | if (host->flags & HOST_F_STOP) | |
750 | SEND_STOP(host); | |
751 | ||
752 | tasklet_schedule(&host->data_task); | |
753 | } | |
754 | ||
755 | #define STATUS_TIMEOUT (SD_STATUS_RAT | SD_STATUS_DT) | |
756 | #define STATUS_DATA_IN (SD_STATUS_NE) | |
757 | #define STATUS_DATA_OUT (SD_STATUS_TH) | |
758 | ||
759 | static irqreturn_t au1xmmc_irq(int irq, void *dev_id, struct pt_regs *regs) | |
760 | { | |
761 | ||
762 | u32 status; | |
763 | int i, ret = 0; | |
764 | ||
765 | disable_irq(AU1100_SD_IRQ); | |
766 | ||
767 | for(i = 0; i < AU1XMMC_CONTROLLER_COUNT; i++) { | |
768 | struct au1xmmc_host * host = au1xmmc_hosts[i]; | |
769 | u32 handled = 1; | |
770 | ||
771 | status = au_readl(HOST_STATUS(host)); | |
772 | ||
773 | if (host->mrq && (status & STATUS_TIMEOUT)) { | |
774 | if (status & SD_STATUS_RAT) | |
775 | host->mrq->cmd->error = MMC_ERR_TIMEOUT; | |
776 | ||
777 | else if (status & SD_STATUS_DT) | |
778 | host->mrq->data->error = MMC_ERR_TIMEOUT; | |
779 | ||
780 | /* In PIO mode, interrupts might still be enabled */ | |
781 | IRQ_OFF(host, SD_CONFIG_NE | SD_CONFIG_TH); | |
782 | ||
783 | //IRQ_OFF(host, SD_CONFIG_TH|SD_CONFIG_RA|SD_CONFIG_RF); | |
784 | tasklet_schedule(&host->finish_task); | |
785 | } | |
786 | #if 0 | |
787 | else if (status & SD_STATUS_DD) { | |
788 | ||
789 | /* Sometimes we get a DD before a NE in PIO mode */ | |
790 | ||
791 | if (!(host->flags & HOST_F_DMA) && | |
792 | (status & SD_STATUS_NE)) | |
793 | au1xmmc_receive_pio(host); | |
794 | else { | |
795 | au1xmmc_data_complete(host, status); | |
796 | //tasklet_schedule(&host->data_task); | |
797 | } | |
798 | } | |
799 | #endif | |
800 | else if (status & (SD_STATUS_CR)) { | |
801 | if (host->status == HOST_S_CMD) | |
802 | au1xmmc_cmd_complete(host,status); | |
803 | } | |
804 | else if (!(host->flags & HOST_F_DMA)) { | |
805 | if ((host->flags & HOST_F_XMIT) && | |
806 | (status & STATUS_DATA_OUT)) | |
807 | au1xmmc_send_pio(host); | |
808 | else if ((host->flags & HOST_F_RECV) && | |
809 | (status & STATUS_DATA_IN)) | |
810 | au1xmmc_receive_pio(host); | |
811 | } | |
812 | else if (status & 0x203FBC70) { | |
813 | DEBUG("Unhandled status %8.8x\n", host->id, status); | |
814 | handled = 0; | |
815 | } | |
816 | ||
817 | au_writel(status, HOST_STATUS(host)); | |
818 | au_sync(); | |
819 | ||
820 | ret |= handled; | |
821 | } | |
822 | ||
823 | enable_irq(AU1100_SD_IRQ); | |
824 | return ret; | |
825 | } | |
826 | ||
827 | static void au1xmmc_poll_event(unsigned long arg) | |
828 | { | |
829 | struct au1xmmc_host *host = (struct au1xmmc_host *) arg; | |
830 | ||
831 | int card = au1xmmc_card_inserted(host); | |
832 | int controller = (host->flags & HOST_F_ACTIVE) ? 1 : 0; | |
833 | ||
834 | if (card != controller) { | |
835 | host->flags &= ~HOST_F_ACTIVE; | |
836 | if (card) host->flags |= HOST_F_ACTIVE; | |
837 | mmc_detect_change(host->mmc, 0); | |
838 | } | |
839 | ||
840 | if (host->mrq != NULL) { | |
841 | u32 status = au_readl(HOST_STATUS(host)); | |
842 | DEBUG("PENDING - %8.8x\n", host->id, status); | |
843 | } | |
844 | ||
845 | mod_timer(&host->timer, jiffies + AU1XMMC_DETECT_TIMEOUT); | |
846 | } | |
847 | ||
848 | static dbdev_tab_t au1xmmc_mem_dbdev = | |
849 | { | |
850 | DSCR_CMD0_ALWAYS, DEV_FLAGS_ANYUSE, 0, 8, 0x00000000, 0, 0 | |
851 | }; | |
852 | ||
853 | static void au1xmmc_init_dma(struct au1xmmc_host *host) | |
854 | { | |
855 | ||
856 | u32 rxchan, txchan; | |
857 | ||
858 | int txid = au1xmmc_card_table[host->id].tx_devid; | |
859 | int rxid = au1xmmc_card_table[host->id].rx_devid; | |
860 | ||
861 | /* DSCR_CMD0_ALWAYS has a stride of 32 bits, we need a stride | |
862 | of 8 bits. And since devices are shared, we need to create | |
863 | our own to avoid freaking out other devices | |
864 | */ | |
865 | ||
866 | int memid = au1xxx_ddma_add_device(&au1xmmc_mem_dbdev); | |
867 | ||
868 | txchan = au1xxx_dbdma_chan_alloc(memid, txid, | |
869 | au1xmmc_dma_callback, (void *) host); | |
870 | ||
871 | rxchan = au1xxx_dbdma_chan_alloc(rxid, memid, | |
872 | au1xmmc_dma_callback, (void *) host); | |
873 | ||
874 | au1xxx_dbdma_set_devwidth(txchan, 8); | |
875 | au1xxx_dbdma_set_devwidth(rxchan, 8); | |
876 | ||
877 | au1xxx_dbdma_ring_alloc(txchan, AU1XMMC_DESCRIPTOR_COUNT); | |
878 | au1xxx_dbdma_ring_alloc(rxchan, AU1XMMC_DESCRIPTOR_COUNT); | |
879 | ||
880 | host->tx_chan = txchan; | |
881 | host->rx_chan = rxchan; | |
882 | } | |
883 | ||
884 | struct mmc_host_ops au1xmmc_ops = { | |
885 | .request = au1xmmc_request, | |
886 | .set_ios = au1xmmc_set_ios, | |
887 | }; | |
888 | ||
889 | static int au1xmmc_probe(struct device *dev) | |
890 | { | |
891 | ||
892 | int i, ret = 0; | |
893 | ||
894 | /* THe interrupt is shared among all controllers */ | |
895 | ret = request_irq(AU1100_SD_IRQ, au1xmmc_irq, SA_INTERRUPT, "MMC", 0); | |
896 | ||
897 | if (ret) { | |
898 | printk(DRIVER_NAME "ERROR: Couldn't get int %d: %d\n", | |
899 | AU1100_SD_IRQ, ret); | |
900 | return -ENXIO; | |
901 | } | |
902 | ||
903 | disable_irq(AU1100_SD_IRQ); | |
904 | ||
905 | for(i = 0; i < AU1XMMC_CONTROLLER_COUNT; i++) { | |
906 | struct mmc_host *mmc = mmc_alloc_host(sizeof(struct au1xmmc_host), dev); | |
907 | struct au1xmmc_host *host = 0; | |
908 | ||
909 | if (!mmc) { | |
910 | printk(DRIVER_NAME "ERROR: no mem for host %d\n", i); | |
911 | au1xmmc_hosts[i] = 0; | |
912 | continue; | |
913 | } | |
914 | ||
915 | mmc->ops = &au1xmmc_ops; | |
916 | ||
917 | mmc->f_min = 450000; | |
918 | mmc->f_max = 24000000; | |
919 | ||
920 | mmc->max_seg_size = AU1XMMC_DESCRIPTOR_SIZE; | |
921 | mmc->max_phys_segs = AU1XMMC_DESCRIPTOR_COUNT; | |
922 | ||
923 | mmc->ocr_avail = AU1XMMC_OCR; | |
924 | ||
925 | host = mmc_priv(mmc); | |
926 | host->mmc = mmc; | |
927 | ||
928 | host->id = i; | |
929 | host->iobase = au1xmmc_card_table[host->id].iobase; | |
930 | host->clock = 0; | |
931 | host->power_mode = MMC_POWER_OFF; | |
932 | ||
933 | host->flags = au1xmmc_card_inserted(host) ? HOST_F_ACTIVE : 0; | |
934 | host->status = HOST_S_IDLE; | |
935 | ||
936 | init_timer(&host->timer); | |
937 | ||
938 | host->timer.function = au1xmmc_poll_event; | |
939 | host->timer.data = (unsigned long) host; | |
940 | host->timer.expires = jiffies + AU1XMMC_DETECT_TIMEOUT; | |
941 | ||
942 | tasklet_init(&host->data_task, au1xmmc_tasklet_data, | |
943 | (unsigned long) host); | |
944 | ||
945 | tasklet_init(&host->finish_task, au1xmmc_tasklet_finish, | |
946 | (unsigned long) host); | |
947 | ||
948 | spin_lock_init(&host->lock); | |
949 | ||
950 | if (dma != 0) | |
951 | au1xmmc_init_dma(host); | |
952 | ||
953 | au1xmmc_reset_controller(host); | |
954 | ||
955 | mmc_add_host(mmc); | |
956 | au1xmmc_hosts[i] = host; | |
957 | ||
958 | add_timer(&host->timer); | |
959 | ||
960 | printk(KERN_INFO DRIVER_NAME ": MMC Controller %d set up at %8.8X (mode=%s)\n", | |
961 | host->id, host->iobase, dma ? "dma" : "pio"); | |
962 | } | |
963 | ||
964 | enable_irq(AU1100_SD_IRQ); | |
965 | ||
966 | return 0; | |
967 | } | |
968 | ||
969 | static int au1xmmc_remove(struct device *dev) | |
970 | { | |
971 | ||
972 | int i; | |
973 | ||
974 | disable_irq(AU1100_SD_IRQ); | |
975 | ||
976 | for(i = 0; i < AU1XMMC_CONTROLLER_COUNT; i++) { | |
977 | struct au1xmmc_host *host = au1xmmc_hosts[i]; | |
978 | if (!host) continue; | |
979 | ||
980 | tasklet_kill(&host->data_task); | |
981 | tasklet_kill(&host->finish_task); | |
982 | ||
983 | del_timer_sync(&host->timer); | |
984 | au1xmmc_set_power(host, 0); | |
985 | ||
986 | mmc_remove_host(host->mmc); | |
987 | ||
988 | au1xxx_dbdma_chan_free(host->tx_chan); | |
989 | au1xxx_dbdma_chan_free(host->rx_chan); | |
990 | ||
991 | au_writel(0x0, HOST_ENABLE(host)); | |
992 | au_sync(); | |
993 | } | |
994 | ||
995 | free_irq(AU1100_SD_IRQ, 0); | |
996 | return 0; | |
997 | } | |
998 | ||
999 | static struct device_driver au1xmmc_driver = { | |
1000 | .name = DRIVER_NAME, | |
1001 | .bus = &platform_bus_type, | |
1002 | .probe = au1xmmc_probe, | |
1003 | .remove = au1xmmc_remove, | |
1004 | .suspend = NULL, | |
1005 | .resume = NULL | |
1006 | }; | |
1007 | ||
1008 | static int __init au1xmmc_init(void) | |
1009 | { | |
1010 | return driver_register(&au1xmmc_driver); | |
1011 | } | |
1012 | ||
1013 | static void __exit au1xmmc_exit(void) | |
1014 | { | |
1015 | driver_unregister(&au1xmmc_driver); | |
1016 | } | |
1017 | ||
1018 | module_init(au1xmmc_init); | |
1019 | module_exit(au1xmmc_exit); | |
1020 | ||
1021 | #ifdef MODULE | |
1022 | MODULE_AUTHOR("Advanced Micro Devices, Inc"); | |
1023 | MODULE_DESCRIPTION("MMC/SD driver for the Alchemy Au1XXX"); | |
1024 | MODULE_LICENSE("GPL"); | |
1025 | #endif | |
1026 |