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7d2be074 HS |
1 | /* |
2 | * Atmel MultiMedia Card Interface driver | |
3 | * | |
4 | * Copyright (C) 2004-2008 Atmel Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/blkdev.h> | |
11 | #include <linux/clk.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/ioport.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/scatterlist.h> | |
19 | ||
20 | #include <linux/mmc/host.h> | |
21 | ||
22 | #include <asm/atmel-mci.h> | |
23 | #include <asm/io.h> | |
24 | #include <asm/unaligned.h> | |
25 | ||
26 | #include <asm/arch/board.h> | |
27 | #include <asm/arch/gpio.h> | |
28 | ||
29 | #include "atmel-mci-regs.h" | |
30 | ||
31 | #define ATMCI_DATA_ERROR_FLAGS (MCI_DCRCE | MCI_DTOE | MCI_OVRE | MCI_UNRE) | |
32 | ||
33 | enum { | |
34 | EVENT_CMD_COMPLETE = 0, | |
35 | EVENT_DATA_ERROR, | |
36 | EVENT_DATA_COMPLETE, | |
37 | EVENT_STOP_SENT, | |
38 | EVENT_STOP_COMPLETE, | |
39 | EVENT_XFER_COMPLETE, | |
40 | }; | |
41 | ||
42 | struct atmel_mci { | |
43 | struct mmc_host *mmc; | |
44 | void __iomem *regs; | |
45 | ||
46 | struct scatterlist *sg; | |
47 | unsigned int pio_offset; | |
48 | ||
49 | struct mmc_request *mrq; | |
50 | struct mmc_command *cmd; | |
51 | struct mmc_data *data; | |
52 | ||
53 | u32 cmd_status; | |
54 | u32 data_status; | |
55 | u32 stop_status; | |
56 | u32 stop_cmdr; | |
57 | ||
58 | u32 mode_reg; | |
59 | u32 sdc_reg; | |
60 | ||
61 | struct tasklet_struct tasklet; | |
62 | unsigned long pending_events; | |
63 | unsigned long completed_events; | |
64 | ||
65 | int present; | |
66 | int detect_pin; | |
67 | int wp_pin; | |
68 | ||
69 | /* For detect pin debouncing */ | |
70 | struct timer_list detect_timer; | |
71 | ||
72 | unsigned long bus_hz; | |
73 | unsigned long mapbase; | |
74 | struct clk *mck; | |
75 | struct platform_device *pdev; | |
76 | }; | |
77 | ||
78 | #define atmci_is_completed(host, event) \ | |
79 | test_bit(event, &host->completed_events) | |
80 | #define atmci_test_and_clear_pending(host, event) \ | |
81 | test_and_clear_bit(event, &host->pending_events) | |
82 | #define atmci_test_and_set_completed(host, event) \ | |
83 | test_and_set_bit(event, &host->completed_events) | |
84 | #define atmci_set_completed(host, event) \ | |
85 | set_bit(event, &host->completed_events) | |
86 | #define atmci_set_pending(host, event) \ | |
87 | set_bit(event, &host->pending_events) | |
88 | #define atmci_clear_pending(host, event) \ | |
89 | clear_bit(event, &host->pending_events) | |
90 | ||
91 | ||
92 | static void atmci_enable(struct atmel_mci *host) | |
93 | { | |
94 | clk_enable(host->mck); | |
95 | mci_writel(host, CR, MCI_CR_MCIEN); | |
96 | mci_writel(host, MR, host->mode_reg); | |
97 | mci_writel(host, SDCR, host->sdc_reg); | |
98 | } | |
99 | ||
100 | static void atmci_disable(struct atmel_mci *host) | |
101 | { | |
102 | mci_writel(host, CR, MCI_CR_SWRST); | |
103 | ||
104 | /* Stall until write is complete, then disable the bus clock */ | |
105 | mci_readl(host, SR); | |
106 | clk_disable(host->mck); | |
107 | } | |
108 | ||
109 | static inline unsigned int ns_to_clocks(struct atmel_mci *host, | |
110 | unsigned int ns) | |
111 | { | |
112 | return (ns * (host->bus_hz / 1000000) + 999) / 1000; | |
113 | } | |
114 | ||
115 | static void atmci_set_timeout(struct atmel_mci *host, | |
116 | struct mmc_data *data) | |
117 | { | |
118 | static unsigned dtomul_to_shift[] = { | |
119 | 0, 4, 7, 8, 10, 12, 16, 20 | |
120 | }; | |
121 | unsigned timeout; | |
122 | unsigned dtocyc; | |
123 | unsigned dtomul; | |
124 | ||
125 | timeout = ns_to_clocks(host, data->timeout_ns) + data->timeout_clks; | |
126 | ||
127 | for (dtomul = 0; dtomul < 8; dtomul++) { | |
128 | unsigned shift = dtomul_to_shift[dtomul]; | |
129 | dtocyc = (timeout + (1 << shift) - 1) >> shift; | |
130 | if (dtocyc < 15) | |
131 | break; | |
132 | } | |
133 | ||
134 | if (dtomul >= 8) { | |
135 | dtomul = 7; | |
136 | dtocyc = 15; | |
137 | } | |
138 | ||
139 | dev_vdbg(&host->mmc->class_dev, "setting timeout to %u cycles\n", | |
140 | dtocyc << dtomul_to_shift[dtomul]); | |
141 | mci_writel(host, DTOR, (MCI_DTOMUL(dtomul) | MCI_DTOCYC(dtocyc))); | |
142 | } | |
143 | ||
144 | /* | |
145 | * Return mask with command flags to be enabled for this command. | |
146 | */ | |
147 | static u32 atmci_prepare_command(struct mmc_host *mmc, | |
148 | struct mmc_command *cmd) | |
149 | { | |
150 | struct mmc_data *data; | |
151 | u32 cmdr; | |
152 | ||
153 | cmd->error = -EINPROGRESS; | |
154 | ||
155 | cmdr = MCI_CMDR_CMDNB(cmd->opcode); | |
156 | ||
157 | if (cmd->flags & MMC_RSP_PRESENT) { | |
158 | if (cmd->flags & MMC_RSP_136) | |
159 | cmdr |= MCI_CMDR_RSPTYP_136BIT; | |
160 | else | |
161 | cmdr |= MCI_CMDR_RSPTYP_48BIT; | |
162 | } | |
163 | ||
164 | /* | |
165 | * This should really be MAXLAT_5 for CMD2 and ACMD41, but | |
166 | * it's too difficult to determine whether this is an ACMD or | |
167 | * not. Better make it 64. | |
168 | */ | |
169 | cmdr |= MCI_CMDR_MAXLAT_64CYC; | |
170 | ||
171 | if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN) | |
172 | cmdr |= MCI_CMDR_OPDCMD; | |
173 | ||
174 | data = cmd->data; | |
175 | if (data) { | |
176 | cmdr |= MCI_CMDR_START_XFER; | |
177 | if (data->flags & MMC_DATA_STREAM) | |
178 | cmdr |= MCI_CMDR_STREAM; | |
179 | else if (data->blocks > 1) | |
180 | cmdr |= MCI_CMDR_MULTI_BLOCK; | |
181 | else | |
182 | cmdr |= MCI_CMDR_BLOCK; | |
183 | ||
184 | if (data->flags & MMC_DATA_READ) | |
185 | cmdr |= MCI_CMDR_TRDIR_READ; | |
186 | } | |
187 | ||
188 | return cmdr; | |
189 | } | |
190 | ||
191 | static void atmci_start_command(struct atmel_mci *host, | |
192 | struct mmc_command *cmd, | |
193 | u32 cmd_flags) | |
194 | { | |
195 | /* Must read host->cmd after testing event flags */ | |
196 | smp_rmb(); | |
197 | WARN_ON(host->cmd); | |
198 | host->cmd = cmd; | |
199 | ||
200 | dev_vdbg(&host->mmc->class_dev, | |
201 | "start command: ARGR=0x%08x CMDR=0x%08x\n", | |
202 | cmd->arg, cmd_flags); | |
203 | ||
204 | mci_writel(host, ARGR, cmd->arg); | |
205 | mci_writel(host, CMDR, cmd_flags); | |
206 | } | |
207 | ||
208 | static void send_stop_cmd(struct mmc_host *mmc, struct mmc_data *data) | |
209 | { | |
210 | struct atmel_mci *host = mmc_priv(mmc); | |
211 | ||
212 | atmci_start_command(host, data->stop, host->stop_cmdr); | |
213 | mci_writel(host, IER, MCI_CMDRDY); | |
214 | } | |
215 | ||
216 | static void atmci_request_end(struct mmc_host *mmc, struct mmc_request *mrq) | |
217 | { | |
218 | struct atmel_mci *host = mmc_priv(mmc); | |
219 | ||
220 | WARN_ON(host->cmd || host->data); | |
221 | host->mrq = NULL; | |
222 | ||
223 | atmci_disable(host); | |
224 | ||
225 | mmc_request_done(mmc, mrq); | |
226 | } | |
227 | ||
228 | /* | |
229 | * Returns a mask of interrupt flags to be enabled after the whole | |
230 | * request has been prepared. | |
231 | */ | |
232 | static u32 atmci_submit_data(struct mmc_host *mmc, struct mmc_data *data) | |
233 | { | |
234 | struct atmel_mci *host = mmc_priv(mmc); | |
235 | u32 iflags; | |
236 | ||
237 | data->error = -EINPROGRESS; | |
238 | ||
239 | WARN_ON(host->data); | |
240 | host->sg = NULL; | |
241 | host->data = data; | |
242 | ||
243 | mci_writel(host, BLKR, MCI_BCNT(data->blocks) | |
244 | | MCI_BLKLEN(data->blksz)); | |
245 | dev_vdbg(&mmc->class_dev, "BLKR=0x%08x\n", | |
246 | MCI_BCNT(data->blocks) | MCI_BLKLEN(data->blksz)); | |
247 | ||
248 | iflags = ATMCI_DATA_ERROR_FLAGS; | |
249 | host->sg = data->sg; | |
250 | host->pio_offset = 0; | |
251 | if (data->flags & MMC_DATA_READ) | |
252 | iflags |= MCI_RXRDY; | |
253 | else | |
254 | iflags |= MCI_TXRDY; | |
255 | ||
256 | return iflags; | |
257 | } | |
258 | ||
259 | static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq) | |
260 | { | |
261 | struct atmel_mci *host = mmc_priv(mmc); | |
262 | struct mmc_data *data; | |
263 | struct mmc_command *cmd; | |
264 | u32 iflags; | |
265 | u32 cmdflags = 0; | |
266 | ||
267 | iflags = mci_readl(host, IMR); | |
268 | if (iflags) | |
269 | dev_warn(&mmc->class_dev, "WARNING: IMR=0x%08x\n", | |
270 | mci_readl(host, IMR)); | |
271 | ||
272 | WARN_ON(host->mrq != NULL); | |
273 | ||
274 | /* | |
275 | * We may "know" the card is gone even though there's still an | |
276 | * electrical connection. If so, we really need to communicate | |
277 | * this to the MMC core since there won't be any more | |
278 | * interrupts as the card is completely removed. Otherwise, | |
279 | * the MMC core might believe the card is still there even | |
280 | * though the card was just removed very slowly. | |
281 | */ | |
282 | if (!host->present) { | |
283 | mrq->cmd->error = -ENOMEDIUM; | |
284 | mmc_request_done(mmc, mrq); | |
285 | return; | |
286 | } | |
287 | ||
288 | host->mrq = mrq; | |
289 | host->pending_events = 0; | |
290 | host->completed_events = 0; | |
291 | ||
292 | atmci_enable(host); | |
293 | ||
294 | /* We don't support multiple blocks of weird lengths. */ | |
295 | data = mrq->data; | |
296 | if (data) { | |
297 | if (data->blocks > 1 && data->blksz & 3) | |
298 | goto fail; | |
299 | atmci_set_timeout(host, data); | |
300 | } | |
301 | ||
302 | iflags = MCI_CMDRDY; | |
303 | cmd = mrq->cmd; | |
304 | cmdflags = atmci_prepare_command(mmc, cmd); | |
305 | atmci_start_command(host, cmd, cmdflags); | |
306 | ||
307 | if (data) | |
308 | iflags |= atmci_submit_data(mmc, data); | |
309 | ||
310 | if (mrq->stop) { | |
311 | host->stop_cmdr = atmci_prepare_command(mmc, mrq->stop); | |
312 | host->stop_cmdr |= MCI_CMDR_STOP_XFER; | |
313 | if (!(data->flags & MMC_DATA_WRITE)) | |
314 | host->stop_cmdr |= MCI_CMDR_TRDIR_READ; | |
315 | if (data->flags & MMC_DATA_STREAM) | |
316 | host->stop_cmdr |= MCI_CMDR_STREAM; | |
317 | else | |
318 | host->stop_cmdr |= MCI_CMDR_MULTI_BLOCK; | |
319 | } | |
320 | ||
321 | /* | |
322 | * We could have enabled interrupts earlier, but I suspect | |
323 | * that would open up a nice can of interesting race | |
324 | * conditions (e.g. command and data complete, but stop not | |
325 | * prepared yet.) | |
326 | */ | |
327 | mci_writel(host, IER, iflags); | |
328 | ||
329 | return; | |
330 | ||
331 | fail: | |
332 | atmci_disable(host); | |
333 | host->mrq = NULL; | |
334 | mrq->cmd->error = -EINVAL; | |
335 | mmc_request_done(mmc, mrq); | |
336 | } | |
337 | ||
338 | static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) | |
339 | { | |
340 | struct atmel_mci *host = mmc_priv(mmc); | |
341 | ||
342 | if (ios->clock) { | |
343 | u32 clkdiv; | |
344 | ||
345 | /* Set clock rate */ | |
346 | clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * ios->clock) - 1; | |
347 | if (clkdiv > 255) { | |
348 | dev_warn(&mmc->class_dev, | |
349 | "clock %u too slow; using %lu\n", | |
350 | ios->clock, host->bus_hz / (2 * 256)); | |
351 | clkdiv = 255; | |
352 | } | |
353 | ||
354 | host->mode_reg = MCI_MR_CLKDIV(clkdiv) | MCI_MR_WRPROOF | |
355 | | MCI_MR_RDPROOF; | |
356 | } | |
357 | ||
358 | switch (ios->bus_width) { | |
359 | case MMC_BUS_WIDTH_1: | |
360 | host->sdc_reg = 0; | |
361 | break; | |
362 | case MMC_BUS_WIDTH_4: | |
363 | host->sdc_reg = MCI_SDCBUS_4BIT; | |
364 | break; | |
365 | } | |
366 | ||
367 | switch (ios->power_mode) { | |
368 | case MMC_POWER_ON: | |
369 | /* Send init sequence (74 clock cycles) */ | |
370 | atmci_enable(host); | |
371 | mci_writel(host, CMDR, MCI_CMDR_SPCMD_INIT); | |
372 | while (!(mci_readl(host, SR) & MCI_CMDRDY)) | |
373 | cpu_relax(); | |
374 | atmci_disable(host); | |
375 | break; | |
376 | default: | |
377 | /* | |
378 | * TODO: None of the currently available AVR32-based | |
379 | * boards allow MMC power to be turned off. Implement | |
380 | * power control when this can be tested properly. | |
381 | */ | |
382 | break; | |
383 | } | |
384 | } | |
385 | ||
386 | static int atmci_get_ro(struct mmc_host *mmc) | |
387 | { | |
388 | int read_only = 0; | |
389 | struct atmel_mci *host = mmc_priv(mmc); | |
390 | ||
391 | if (host->wp_pin >= 0) { | |
392 | read_only = gpio_get_value(host->wp_pin); | |
393 | dev_dbg(&mmc->class_dev, "card is %s\n", | |
394 | read_only ? "read-only" : "read-write"); | |
395 | } else { | |
396 | dev_dbg(&mmc->class_dev, | |
397 | "no pin for checking read-only switch." | |
398 | " Assuming write-enable.\n"); | |
399 | } | |
400 | ||
401 | return read_only; | |
402 | } | |
403 | ||
404 | static struct mmc_host_ops atmci_ops = { | |
405 | .request = atmci_request, | |
406 | .set_ios = atmci_set_ios, | |
407 | .get_ro = atmci_get_ro, | |
408 | }; | |
409 | ||
410 | static void atmci_command_complete(struct atmel_mci *host, | |
411 | struct mmc_command *cmd, u32 status) | |
412 | { | |
413 | /* Read the response from the card (up to 16 bytes) */ | |
414 | cmd->resp[0] = mci_readl(host, RSPR); | |
415 | cmd->resp[1] = mci_readl(host, RSPR); | |
416 | cmd->resp[2] = mci_readl(host, RSPR); | |
417 | cmd->resp[3] = mci_readl(host, RSPR); | |
418 | ||
419 | if (status & MCI_RTOE) | |
420 | cmd->error = -ETIMEDOUT; | |
421 | else if ((cmd->flags & MMC_RSP_CRC) && (status & MCI_RCRCE)) | |
422 | cmd->error = -EILSEQ; | |
423 | else if (status & (MCI_RINDE | MCI_RDIRE | MCI_RENDE)) | |
424 | cmd->error = -EIO; | |
425 | else | |
426 | cmd->error = 0; | |
427 | ||
428 | if (cmd->error) { | |
429 | dev_dbg(&host->mmc->class_dev, | |
430 | "command error: status=0x%08x\n", status); | |
431 | ||
432 | if (cmd->data) { | |
433 | host->data = NULL; | |
434 | mci_writel(host, IDR, MCI_NOTBUSY | |
435 | | MCI_TXRDY | MCI_RXRDY | |
436 | | ATMCI_DATA_ERROR_FLAGS); | |
437 | } | |
438 | } | |
439 | } | |
440 | ||
441 | static void atmci_detect_change(unsigned long data) | |
442 | { | |
443 | struct atmel_mci *host = (struct atmel_mci *)data; | |
444 | struct mmc_request *mrq = host->mrq; | |
445 | int present; | |
446 | ||
447 | /* | |
448 | * atmci_remove() sets detect_pin to -1 before freeing the | |
449 | * interrupt. We must not re-enable the interrupt if it has | |
450 | * been freed. | |
451 | */ | |
452 | smp_rmb(); | |
453 | if (host->detect_pin < 0) | |
454 | return; | |
455 | ||
456 | enable_irq(gpio_to_irq(host->detect_pin)); | |
457 | present = !gpio_get_value(host->detect_pin); | |
458 | ||
459 | dev_vdbg(&host->pdev->dev, "detect change: %d (was %d)\n", | |
460 | present, host->present); | |
461 | ||
462 | if (present != host->present) { | |
463 | dev_dbg(&host->mmc->class_dev, "card %s\n", | |
464 | present ? "inserted" : "removed"); | |
465 | host->present = present; | |
466 | ||
467 | /* Reset controller if card is gone */ | |
468 | if (!present) { | |
469 | mci_writel(host, CR, MCI_CR_SWRST); | |
470 | mci_writel(host, IDR, ~0UL); | |
471 | mci_writel(host, CR, MCI_CR_MCIEN); | |
472 | } | |
473 | ||
474 | /* Clean up queue if present */ | |
475 | if (mrq) { | |
476 | /* | |
477 | * Reset controller to terminate any ongoing | |
478 | * commands or data transfers. | |
479 | */ | |
480 | mci_writel(host, CR, MCI_CR_SWRST); | |
481 | ||
482 | if (!atmci_is_completed(host, EVENT_CMD_COMPLETE)) | |
483 | mrq->cmd->error = -ENOMEDIUM; | |
484 | ||
485 | if (mrq->data && !atmci_is_completed(host, | |
486 | EVENT_DATA_COMPLETE)) { | |
487 | host->data = NULL; | |
488 | mrq->data->error = -ENOMEDIUM; | |
489 | } | |
490 | if (mrq->stop && !atmci_is_completed(host, | |
491 | EVENT_STOP_COMPLETE)) | |
492 | mrq->stop->error = -ENOMEDIUM; | |
493 | ||
494 | host->cmd = NULL; | |
495 | atmci_request_end(host->mmc, mrq); | |
496 | } | |
497 | ||
498 | mmc_detect_change(host->mmc, 0); | |
499 | } | |
500 | } | |
501 | ||
502 | static void atmci_tasklet_func(unsigned long priv) | |
503 | { | |
504 | struct mmc_host *mmc = (struct mmc_host *)priv; | |
505 | struct atmel_mci *host = mmc_priv(mmc); | |
506 | struct mmc_request *mrq = host->mrq; | |
507 | struct mmc_data *data = host->data; | |
508 | ||
509 | dev_vdbg(&mmc->class_dev, | |
510 | "tasklet: pending/completed/mask %lx/%lx/%x\n", | |
511 | host->pending_events, host->completed_events, | |
512 | mci_readl(host, IMR)); | |
513 | ||
514 | if (atmci_test_and_clear_pending(host, EVENT_CMD_COMPLETE)) { | |
515 | /* | |
516 | * host->cmd must be set to NULL before the interrupt | |
517 | * handler sees EVENT_CMD_COMPLETE | |
518 | */ | |
519 | host->cmd = NULL; | |
520 | smp_wmb(); | |
521 | atmci_set_completed(host, EVENT_CMD_COMPLETE); | |
522 | atmci_command_complete(host, mrq->cmd, host->cmd_status); | |
523 | ||
524 | if (!mrq->cmd->error && mrq->stop | |
525 | && atmci_is_completed(host, EVENT_XFER_COMPLETE) | |
526 | && !atmci_test_and_set_completed(host, | |
527 | EVENT_STOP_SENT)) | |
528 | send_stop_cmd(host->mmc, mrq->data); | |
529 | } | |
530 | if (atmci_test_and_clear_pending(host, EVENT_STOP_COMPLETE)) { | |
531 | /* | |
532 | * host->cmd must be set to NULL before the interrupt | |
533 | * handler sees EVENT_STOP_COMPLETE | |
534 | */ | |
535 | host->cmd = NULL; | |
536 | smp_wmb(); | |
537 | atmci_set_completed(host, EVENT_STOP_COMPLETE); | |
538 | atmci_command_complete(host, mrq->stop, host->stop_status); | |
539 | } | |
540 | if (atmci_test_and_clear_pending(host, EVENT_DATA_ERROR)) { | |
541 | u32 status = host->data_status; | |
542 | ||
543 | dev_vdbg(&mmc->class_dev, "data error: status=%08x\n", status); | |
544 | ||
545 | atmci_set_completed(host, EVENT_DATA_ERROR); | |
546 | atmci_set_completed(host, EVENT_DATA_COMPLETE); | |
547 | ||
548 | if (status & MCI_DTOE) { | |
549 | dev_dbg(&mmc->class_dev, | |
550 | "data timeout error\n"); | |
551 | data->error = -ETIMEDOUT; | |
552 | } else if (status & MCI_DCRCE) { | |
553 | dev_dbg(&mmc->class_dev, "data CRC error\n"); | |
554 | data->error = -EILSEQ; | |
555 | } else { | |
556 | dev_dbg(&mmc->class_dev, | |
557 | "data FIFO error (status=%08x)\n", | |
558 | status); | |
559 | data->error = -EIO; | |
560 | } | |
561 | ||
562 | if (host->present && data->stop | |
563 | && atmci_is_completed(host, EVENT_CMD_COMPLETE) | |
564 | && !atmci_test_and_set_completed( | |
565 | host, EVENT_STOP_SENT)) | |
566 | send_stop_cmd(host->mmc, data); | |
567 | ||
568 | host->data = NULL; | |
569 | } | |
570 | if (atmci_test_and_clear_pending(host, EVENT_DATA_COMPLETE)) { | |
571 | atmci_set_completed(host, EVENT_DATA_COMPLETE); | |
572 | ||
573 | if (!atmci_is_completed(host, EVENT_DATA_ERROR)) { | |
574 | data->bytes_xfered = data->blocks * data->blksz; | |
575 | data->error = 0; | |
576 | } | |
577 | ||
578 | host->data = NULL; | |
579 | } | |
580 | ||
581 | if (host->mrq && !host->cmd && !host->data) | |
582 | atmci_request_end(mmc, host->mrq); | |
583 | } | |
584 | ||
585 | static void atmci_read_data_pio(struct atmel_mci *host) | |
586 | { | |
587 | struct scatterlist *sg = host->sg; | |
588 | void *buf = sg_virt(sg); | |
589 | unsigned int offset = host->pio_offset; | |
590 | struct mmc_data *data = host->data; | |
591 | u32 value; | |
592 | u32 status; | |
593 | unsigned int nbytes = 0; | |
594 | ||
595 | do { | |
596 | value = mci_readl(host, RDR); | |
597 | if (likely(offset + 4 <= sg->length)) { | |
598 | put_unaligned(value, (u32 *)(buf + offset)); | |
599 | ||
600 | offset += 4; | |
601 | nbytes += 4; | |
602 | ||
603 | if (offset == sg->length) { | |
604 | host->sg = sg = sg_next(sg); | |
605 | if (!sg) | |
606 | goto done; | |
607 | ||
608 | offset = 0; | |
609 | buf = sg_virt(sg); | |
610 | } | |
611 | } else { | |
612 | unsigned int remaining = sg->length - offset; | |
613 | memcpy(buf + offset, &value, remaining); | |
614 | nbytes += remaining; | |
615 | ||
616 | flush_dcache_page(sg_page(sg)); | |
617 | host->sg = sg = sg_next(sg); | |
618 | if (!sg) | |
619 | goto done; | |
620 | ||
621 | offset = 4 - remaining; | |
622 | buf = sg_virt(sg); | |
623 | memcpy(buf, (u8 *)&value + remaining, offset); | |
624 | nbytes += offset; | |
625 | } | |
626 | ||
627 | status = mci_readl(host, SR); | |
628 | if (status & ATMCI_DATA_ERROR_FLAGS) { | |
629 | mci_writel(host, IDR, (MCI_NOTBUSY | MCI_RXRDY | |
630 | | ATMCI_DATA_ERROR_FLAGS)); | |
631 | host->data_status = status; | |
632 | atmci_set_pending(host, EVENT_DATA_ERROR); | |
633 | tasklet_schedule(&host->tasklet); | |
634 | break; | |
635 | } | |
636 | } while (status & MCI_RXRDY); | |
637 | ||
638 | host->pio_offset = offset; | |
639 | data->bytes_xfered += nbytes; | |
640 | ||
641 | return; | |
642 | ||
643 | done: | |
644 | mci_writel(host, IDR, MCI_RXRDY); | |
645 | mci_writel(host, IER, MCI_NOTBUSY); | |
646 | data->bytes_xfered += nbytes; | |
647 | atmci_set_completed(host, EVENT_XFER_COMPLETE); | |
648 | if (data->stop && atmci_is_completed(host, EVENT_CMD_COMPLETE) | |
649 | && !atmci_test_and_set_completed(host, EVENT_STOP_SENT)) | |
650 | send_stop_cmd(host->mmc, data); | |
651 | } | |
652 | ||
653 | static void atmci_write_data_pio(struct atmel_mci *host) | |
654 | { | |
655 | struct scatterlist *sg = host->sg; | |
656 | void *buf = sg_virt(sg); | |
657 | unsigned int offset = host->pio_offset; | |
658 | struct mmc_data *data = host->data; | |
659 | u32 value; | |
660 | u32 status; | |
661 | unsigned int nbytes = 0; | |
662 | ||
663 | do { | |
664 | if (likely(offset + 4 <= sg->length)) { | |
665 | value = get_unaligned((u32 *)(buf + offset)); | |
666 | mci_writel(host, TDR, value); | |
667 | ||
668 | offset += 4; | |
669 | nbytes += 4; | |
670 | if (offset == sg->length) { | |
671 | host->sg = sg = sg_next(sg); | |
672 | if (!sg) | |
673 | goto done; | |
674 | ||
675 | offset = 0; | |
676 | buf = sg_virt(sg); | |
677 | } | |
678 | } else { | |
679 | unsigned int remaining = sg->length - offset; | |
680 | ||
681 | value = 0; | |
682 | memcpy(&value, buf + offset, remaining); | |
683 | nbytes += remaining; | |
684 | ||
685 | host->sg = sg = sg_next(sg); | |
686 | if (!sg) { | |
687 | mci_writel(host, TDR, value); | |
688 | goto done; | |
689 | } | |
690 | ||
691 | offset = 4 - remaining; | |
692 | buf = sg_virt(sg); | |
693 | memcpy((u8 *)&value + remaining, buf, offset); | |
694 | mci_writel(host, TDR, value); | |
695 | nbytes += offset; | |
696 | } | |
697 | ||
698 | status = mci_readl(host, SR); | |
699 | if (status & ATMCI_DATA_ERROR_FLAGS) { | |
700 | mci_writel(host, IDR, (MCI_NOTBUSY | MCI_TXRDY | |
701 | | ATMCI_DATA_ERROR_FLAGS)); | |
702 | host->data_status = status; | |
703 | atmci_set_pending(host, EVENT_DATA_ERROR); | |
704 | tasklet_schedule(&host->tasklet); | |
705 | break; | |
706 | } | |
707 | } while (status & MCI_TXRDY); | |
708 | ||
709 | host->pio_offset = offset; | |
710 | data->bytes_xfered += nbytes; | |
711 | ||
712 | return; | |
713 | ||
714 | done: | |
715 | mci_writel(host, IDR, MCI_TXRDY); | |
716 | mci_writel(host, IER, MCI_NOTBUSY); | |
717 | data->bytes_xfered += nbytes; | |
718 | atmci_set_completed(host, EVENT_XFER_COMPLETE); | |
719 | if (data->stop && atmci_is_completed(host, EVENT_CMD_COMPLETE) | |
720 | && !atmci_test_and_set_completed(host, EVENT_STOP_SENT)) | |
721 | send_stop_cmd(host->mmc, data); | |
722 | } | |
723 | ||
724 | static void atmci_cmd_interrupt(struct mmc_host *mmc, u32 status) | |
725 | { | |
726 | struct atmel_mci *host = mmc_priv(mmc); | |
727 | ||
728 | mci_writel(host, IDR, MCI_CMDRDY); | |
729 | ||
730 | if (atmci_is_completed(host, EVENT_STOP_SENT)) { | |
731 | host->stop_status = status; | |
732 | atmci_set_pending(host, EVENT_STOP_COMPLETE); | |
733 | } else { | |
734 | host->cmd_status = status; | |
735 | atmci_set_pending(host, EVENT_CMD_COMPLETE); | |
736 | } | |
737 | ||
738 | tasklet_schedule(&host->tasklet); | |
739 | } | |
740 | ||
741 | static irqreturn_t atmci_interrupt(int irq, void *dev_id) | |
742 | { | |
743 | struct mmc_host *mmc = dev_id; | |
744 | struct atmel_mci *host = mmc_priv(mmc); | |
745 | u32 status, mask, pending; | |
746 | unsigned int pass_count = 0; | |
747 | ||
748 | spin_lock(&mmc->lock); | |
749 | ||
750 | do { | |
751 | status = mci_readl(host, SR); | |
752 | mask = mci_readl(host, IMR); | |
753 | pending = status & mask; | |
754 | if (!pending) | |
755 | break; | |
756 | ||
757 | if (pending & ATMCI_DATA_ERROR_FLAGS) { | |
758 | mci_writel(host, IDR, ATMCI_DATA_ERROR_FLAGS | |
759 | | MCI_RXRDY | MCI_TXRDY); | |
760 | pending &= mci_readl(host, IMR); | |
761 | host->data_status = status; | |
762 | atmci_set_pending(host, EVENT_DATA_ERROR); | |
763 | tasklet_schedule(&host->tasklet); | |
764 | } | |
765 | if (pending & MCI_NOTBUSY) { | |
766 | mci_writel(host, IDR, (MCI_NOTBUSY | |
767 | | ATMCI_DATA_ERROR_FLAGS)); | |
768 | atmci_set_pending(host, EVENT_DATA_COMPLETE); | |
769 | tasklet_schedule(&host->tasklet); | |
770 | } | |
771 | if (pending & MCI_RXRDY) | |
772 | atmci_read_data_pio(host); | |
773 | if (pending & MCI_TXRDY) | |
774 | atmci_write_data_pio(host); | |
775 | ||
776 | if (pending & MCI_CMDRDY) | |
777 | atmci_cmd_interrupt(mmc, status); | |
778 | } while (pass_count++ < 5); | |
779 | ||
780 | spin_unlock(&mmc->lock); | |
781 | ||
782 | return pass_count ? IRQ_HANDLED : IRQ_NONE; | |
783 | } | |
784 | ||
785 | static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id) | |
786 | { | |
787 | struct mmc_host *mmc = dev_id; | |
788 | struct atmel_mci *host = mmc_priv(mmc); | |
789 | ||
790 | /* | |
791 | * Disable interrupts until the pin has stabilized and check | |
792 | * the state then. Use mod_timer() since we may be in the | |
793 | * middle of the timer routine when this interrupt triggers. | |
794 | */ | |
795 | disable_irq_nosync(irq); | |
796 | mod_timer(&host->detect_timer, jiffies + msecs_to_jiffies(20)); | |
797 | ||
798 | return IRQ_HANDLED; | |
799 | } | |
800 | ||
801 | static int __init atmci_probe(struct platform_device *pdev) | |
802 | { | |
803 | struct mci_platform_data *pdata; | |
804 | struct atmel_mci *host; | |
805 | struct mmc_host *mmc; | |
806 | struct resource *regs; | |
807 | int irq; | |
808 | int ret; | |
809 | ||
810 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
811 | if (!regs) | |
812 | return -ENXIO; | |
813 | pdata = pdev->dev.platform_data; | |
814 | if (!pdata) | |
815 | return -ENXIO; | |
816 | irq = platform_get_irq(pdev, 0); | |
817 | if (irq < 0) | |
818 | return irq; | |
819 | ||
820 | mmc = mmc_alloc_host(sizeof(struct atmel_mci), &pdev->dev); | |
821 | if (!mmc) | |
822 | return -ENOMEM; | |
823 | ||
824 | host = mmc_priv(mmc); | |
825 | host->pdev = pdev; | |
826 | host->mmc = mmc; | |
827 | host->detect_pin = pdata->detect_pin; | |
828 | host->wp_pin = pdata->wp_pin; | |
829 | ||
830 | host->mck = clk_get(&pdev->dev, "mci_clk"); | |
831 | if (IS_ERR(host->mck)) { | |
832 | ret = PTR_ERR(host->mck); | |
833 | goto err_clk_get; | |
834 | } | |
835 | ||
836 | ret = -ENOMEM; | |
837 | host->regs = ioremap(regs->start, regs->end - regs->start + 1); | |
838 | if (!host->regs) | |
839 | goto err_ioremap; | |
840 | ||
841 | clk_enable(host->mck); | |
842 | mci_writel(host, CR, MCI_CR_SWRST); | |
843 | host->bus_hz = clk_get_rate(host->mck); | |
844 | clk_disable(host->mck); | |
845 | ||
846 | host->mapbase = regs->start; | |
847 | ||
848 | mmc->ops = &atmci_ops; | |
849 | mmc->f_min = (host->bus_hz + 511) / 512; | |
850 | mmc->f_max = host->bus_hz / 2; | |
851 | mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; | |
23af6039 | 852 | mmc->caps |= MMC_CAP_4_BIT_DATA; |
7d2be074 HS |
853 | |
854 | mmc->max_hw_segs = 64; | |
855 | mmc->max_phys_segs = 64; | |
856 | mmc->max_req_size = 32768 * 512; | |
857 | mmc->max_blk_size = 32768; | |
858 | mmc->max_blk_count = 512; | |
859 | ||
860 | tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)mmc); | |
861 | ||
862 | ret = request_irq(irq, atmci_interrupt, 0, pdev->dev.bus_id, mmc); | |
863 | if (ret) | |
864 | goto err_request_irq; | |
865 | ||
866 | /* Assume card is present if we don't have a detect pin */ | |
867 | host->present = 1; | |
868 | if (host->detect_pin >= 0) { | |
869 | if (gpio_request(host->detect_pin, "mmc_detect")) { | |
870 | dev_dbg(&mmc->class_dev, "no detect pin available\n"); | |
871 | host->detect_pin = -1; | |
872 | } else { | |
873 | host->present = !gpio_get_value(host->detect_pin); | |
874 | } | |
875 | } | |
876 | if (host->wp_pin >= 0) { | |
877 | if (gpio_request(host->wp_pin, "mmc_wp")) { | |
878 | dev_dbg(&mmc->class_dev, "no WP pin available\n"); | |
879 | host->wp_pin = -1; | |
880 | } | |
881 | } | |
882 | ||
883 | platform_set_drvdata(pdev, host); | |
884 | ||
885 | mmc_add_host(mmc); | |
886 | ||
887 | if (host->detect_pin >= 0) { | |
888 | setup_timer(&host->detect_timer, atmci_detect_change, | |
889 | (unsigned long)host); | |
890 | ||
891 | ret = request_irq(gpio_to_irq(host->detect_pin), | |
892 | atmci_detect_interrupt, | |
893 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, | |
894 | "mmc-detect", mmc); | |
895 | if (ret) { | |
896 | dev_dbg(&mmc->class_dev, | |
897 | "could not request IRQ %d for detect pin\n", | |
898 | gpio_to_irq(host->detect_pin)); | |
899 | gpio_free(host->detect_pin); | |
900 | host->detect_pin = -1; | |
901 | } | |
902 | } | |
903 | ||
904 | dev_info(&mmc->class_dev, | |
905 | "Atmel MCI controller at 0x%08lx irq %d\n", | |
906 | host->mapbase, irq); | |
907 | ||
908 | return 0; | |
909 | ||
910 | err_request_irq: | |
911 | iounmap(host->regs); | |
912 | err_ioremap: | |
913 | clk_put(host->mck); | |
914 | err_clk_get: | |
915 | mmc_free_host(mmc); | |
916 | return ret; | |
917 | } | |
918 | ||
919 | static int __exit atmci_remove(struct platform_device *pdev) | |
920 | { | |
921 | struct atmel_mci *host = platform_get_drvdata(pdev); | |
922 | ||
923 | platform_set_drvdata(pdev, NULL); | |
924 | ||
925 | if (host) { | |
926 | if (host->detect_pin >= 0) { | |
927 | int pin = host->detect_pin; | |
928 | ||
929 | /* Make sure the timer doesn't enable the interrupt */ | |
930 | host->detect_pin = -1; | |
931 | smp_wmb(); | |
932 | ||
933 | free_irq(gpio_to_irq(pin), host->mmc); | |
934 | del_timer_sync(&host->detect_timer); | |
935 | gpio_free(pin); | |
936 | } | |
937 | ||
938 | mmc_remove_host(host->mmc); | |
939 | ||
940 | clk_enable(host->mck); | |
941 | mci_writel(host, IDR, ~0UL); | |
942 | mci_writel(host, CR, MCI_CR_MCIDIS); | |
943 | mci_readl(host, SR); | |
944 | clk_disable(host->mck); | |
945 | ||
946 | if (host->wp_pin >= 0) | |
947 | gpio_free(host->wp_pin); | |
948 | ||
949 | free_irq(platform_get_irq(pdev, 0), host->mmc); | |
950 | iounmap(host->regs); | |
951 | ||
952 | clk_put(host->mck); | |
953 | ||
954 | mmc_free_host(host->mmc); | |
955 | } | |
956 | return 0; | |
957 | } | |
958 | ||
959 | static struct platform_driver atmci_driver = { | |
960 | .remove = __exit_p(atmci_remove), | |
961 | .driver = { | |
962 | .name = "atmel_mci", | |
963 | }, | |
964 | }; | |
965 | ||
966 | static int __init atmci_init(void) | |
967 | { | |
968 | return platform_driver_probe(&atmci_driver, atmci_probe); | |
969 | } | |
970 | ||
971 | static void __exit atmci_exit(void) | |
972 | { | |
973 | platform_driver_unregister(&atmci_driver); | |
974 | } | |
975 | ||
976 | module_init(atmci_init); | |
977 | module_exit(atmci_exit); | |
978 | ||
979 | MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver"); | |
980 | MODULE_AUTHOR("Haavard Skinnemoen <haavard.skinnemoen@atmel.com>"); | |
981 | MODULE_LICENSE("GPL v2"); |