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1da177e4 LT |
1 | /* |
2 | * linux/drivers/mmc/wbsd.c - Winbond W83L51xD SD/MMC driver | |
3 | * | |
4 | * Copyright (C) 2004-2005 Pierre Ossman, All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * | |
11 | * Warning! | |
12 | * | |
13 | * Changes to the FIFO system should be done with extreme care since | |
14 | * the hardware is full of bugs related to the FIFO. Known issues are: | |
15 | * | |
16 | * - FIFO size field in FSR is always zero. | |
17 | * | |
18 | * - FIFO interrupts tend not to work as they should. Interrupts are | |
19 | * triggered only for full/empty events, not for threshold values. | |
20 | * | |
21 | * - On APIC systems the FIFO empty interrupt is sometimes lost. | |
22 | */ | |
23 | ||
24 | #include <linux/config.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/moduleparam.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/ioport.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/highmem.h> | |
33 | #include <linux/mmc/host.h> | |
34 | #include <linux/mmc/protocol.h> | |
35 | ||
36 | #include <asm/io.h> | |
37 | #include <asm/dma.h> | |
38 | #include <asm/scatterlist.h> | |
39 | ||
40 | #include "wbsd.h" | |
41 | ||
42 | #define DRIVER_NAME "wbsd" | |
43 | #define DRIVER_VERSION "1.1" | |
44 | ||
45 | #ifdef CONFIG_MMC_DEBUG | |
46 | #define DBG(x...) \ | |
47 | printk(KERN_DEBUG DRIVER_NAME ": " x) | |
48 | #define DBGF(f, x...) \ | |
49 | printk(KERN_DEBUG DRIVER_NAME " [%s()]: " f, __func__ , ##x) | |
50 | #else | |
51 | #define DBG(x...) do { } while (0) | |
52 | #define DBGF(x...) do { } while (0) | |
53 | #endif | |
54 | ||
55 | static unsigned int io = 0x248; | |
56 | static unsigned int irq = 6; | |
57 | static int dma = 2; | |
58 | ||
59 | #ifdef CONFIG_MMC_DEBUG | |
60 | void DBG_REG(int reg, u8 value) | |
61 | { | |
62 | int i; | |
63 | ||
64 | printk(KERN_DEBUG "wbsd: Register %d: 0x%02X %3d '%c' ", | |
65 | reg, (int)value, (int)value, (value < 0x20)?'.':value); | |
66 | ||
67 | for (i = 7;i >= 0;i--) | |
68 | { | |
69 | if (value & (1 << i)) | |
70 | printk("x"); | |
71 | else | |
72 | printk("."); | |
73 | } | |
74 | ||
75 | printk("\n"); | |
76 | } | |
77 | #else | |
78 | #define DBG_REG(r, v) do {} while (0) | |
79 | #endif | |
80 | ||
81 | /* | |
82 | * Basic functions | |
83 | */ | |
84 | ||
85 | static inline void wbsd_unlock_config(struct wbsd_host* host) | |
86 | { | |
87 | outb(host->unlock_code, host->config); | |
88 | outb(host->unlock_code, host->config); | |
89 | } | |
90 | ||
91 | static inline void wbsd_lock_config(struct wbsd_host* host) | |
92 | { | |
93 | outb(LOCK_CODE, host->config); | |
94 | } | |
95 | ||
96 | static inline void wbsd_write_config(struct wbsd_host* host, u8 reg, u8 value) | |
97 | { | |
98 | outb(reg, host->config); | |
99 | outb(value, host->config + 1); | |
100 | } | |
101 | ||
102 | static inline u8 wbsd_read_config(struct wbsd_host* host, u8 reg) | |
103 | { | |
104 | outb(reg, host->config); | |
105 | return inb(host->config + 1); | |
106 | } | |
107 | ||
108 | static inline void wbsd_write_index(struct wbsd_host* host, u8 index, u8 value) | |
109 | { | |
110 | outb(index, host->base + WBSD_IDXR); | |
111 | outb(value, host->base + WBSD_DATAR); | |
112 | } | |
113 | ||
114 | static inline u8 wbsd_read_index(struct wbsd_host* host, u8 index) | |
115 | { | |
116 | outb(index, host->base + WBSD_IDXR); | |
117 | return inb(host->base + WBSD_DATAR); | |
118 | } | |
119 | ||
120 | /* | |
121 | * Common routines | |
122 | */ | |
123 | ||
124 | static void wbsd_init_device(struct wbsd_host* host) | |
125 | { | |
126 | u8 setup, ier; | |
127 | ||
128 | /* | |
129 | * Reset chip (SD/MMC part) and fifo. | |
130 | */ | |
131 | setup = wbsd_read_index(host, WBSD_IDX_SETUP); | |
132 | setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET; | |
133 | wbsd_write_index(host, WBSD_IDX_SETUP, setup); | |
134 | ||
135 | /* | |
136 | * Read back default clock. | |
137 | */ | |
138 | host->clk = wbsd_read_index(host, WBSD_IDX_CLK); | |
139 | ||
140 | /* | |
141 | * Power down port. | |
142 | */ | |
143 | outb(WBSD_POWER_N, host->base + WBSD_CSR); | |
144 | ||
145 | /* | |
146 | * Set maximum timeout. | |
147 | */ | |
148 | wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F); | |
149 | ||
150 | /* | |
151 | * Enable interesting interrupts. | |
152 | */ | |
153 | ier = 0; | |
154 | ier |= WBSD_EINT_CARD; | |
155 | ier |= WBSD_EINT_FIFO_THRE; | |
156 | ier |= WBSD_EINT_CCRC; | |
157 | ier |= WBSD_EINT_TIMEOUT; | |
158 | ier |= WBSD_EINT_CRC; | |
159 | ier |= WBSD_EINT_TC; | |
160 | ||
161 | outb(ier, host->base + WBSD_EIR); | |
162 | ||
163 | /* | |
164 | * Clear interrupts. | |
165 | */ | |
166 | inb(host->base + WBSD_ISR); | |
167 | } | |
168 | ||
169 | static void wbsd_reset(struct wbsd_host* host) | |
170 | { | |
171 | u8 setup; | |
172 | ||
173 | printk(KERN_ERR DRIVER_NAME ": Resetting chip\n"); | |
174 | ||
175 | /* | |
176 | * Soft reset of chip (SD/MMC part). | |
177 | */ | |
178 | setup = wbsd_read_index(host, WBSD_IDX_SETUP); | |
179 | setup |= WBSD_SOFT_RESET; | |
180 | wbsd_write_index(host, WBSD_IDX_SETUP, setup); | |
181 | } | |
182 | ||
183 | static void wbsd_request_end(struct wbsd_host* host, struct mmc_request* mrq) | |
184 | { | |
185 | unsigned long dmaflags; | |
186 | ||
187 | DBGF("Ending request, cmd (%x)\n", mrq->cmd->opcode); | |
188 | ||
189 | if (host->dma >= 0) | |
190 | { | |
191 | /* | |
192 | * Release ISA DMA controller. | |
193 | */ | |
194 | dmaflags = claim_dma_lock(); | |
195 | disable_dma(host->dma); | |
196 | clear_dma_ff(host->dma); | |
197 | release_dma_lock(dmaflags); | |
198 | ||
199 | /* | |
200 | * Disable DMA on host. | |
201 | */ | |
202 | wbsd_write_index(host, WBSD_IDX_DMA, 0); | |
203 | } | |
204 | ||
205 | host->mrq = NULL; | |
206 | ||
207 | /* | |
208 | * MMC layer might call back into the driver so first unlock. | |
209 | */ | |
210 | spin_unlock(&host->lock); | |
211 | mmc_request_done(host->mmc, mrq); | |
212 | spin_lock(&host->lock); | |
213 | } | |
214 | ||
215 | /* | |
216 | * Scatter/gather functions | |
217 | */ | |
218 | ||
219 | static inline void wbsd_init_sg(struct wbsd_host* host, struct mmc_data* data) | |
220 | { | |
221 | /* | |
222 | * Get info. about SG list from data structure. | |
223 | */ | |
224 | host->cur_sg = data->sg; | |
225 | host->num_sg = data->sg_len; | |
226 | ||
227 | host->offset = 0; | |
228 | host->remain = host->cur_sg->length; | |
229 | } | |
230 | ||
231 | static inline int wbsd_next_sg(struct wbsd_host* host) | |
232 | { | |
233 | /* | |
234 | * Skip to next SG entry. | |
235 | */ | |
236 | host->cur_sg++; | |
237 | host->num_sg--; | |
238 | ||
239 | /* | |
240 | * Any entries left? | |
241 | */ | |
242 | if (host->num_sg > 0) | |
243 | { | |
244 | host->offset = 0; | |
245 | host->remain = host->cur_sg->length; | |
246 | } | |
247 | ||
248 | return host->num_sg; | |
249 | } | |
250 | ||
251 | static inline char* wbsd_kmap_sg(struct wbsd_host* host) | |
252 | { | |
253 | host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ) + | |
254 | host->cur_sg->offset; | |
255 | return host->mapped_sg; | |
256 | } | |
257 | ||
258 | static inline void wbsd_kunmap_sg(struct wbsd_host* host) | |
259 | { | |
260 | kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ); | |
261 | } | |
262 | ||
263 | static inline void wbsd_sg_to_dma(struct wbsd_host* host, struct mmc_data* data) | |
264 | { | |
265 | unsigned int len, i, size; | |
266 | struct scatterlist* sg; | |
267 | char* dmabuf = host->dma_buffer; | |
268 | char* sgbuf; | |
269 | ||
270 | size = host->size; | |
271 | ||
272 | sg = data->sg; | |
273 | len = data->sg_len; | |
274 | ||
275 | /* | |
276 | * Just loop through all entries. Size might not | |
277 | * be the entire list though so make sure that | |
278 | * we do not transfer too much. | |
279 | */ | |
280 | for (i = 0;i < len;i++) | |
281 | { | |
282 | sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset; | |
283 | if (size < sg[i].length) | |
284 | memcpy(dmabuf, sgbuf, size); | |
285 | else | |
286 | memcpy(dmabuf, sgbuf, sg[i].length); | |
287 | kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ); | |
288 | dmabuf += sg[i].length; | |
289 | ||
290 | if (size < sg[i].length) | |
291 | size = 0; | |
292 | else | |
293 | size -= sg[i].length; | |
294 | ||
295 | if (size == 0) | |
296 | break; | |
297 | } | |
298 | ||
299 | /* | |
300 | * Check that we didn't get a request to transfer | |
301 | * more data than can fit into the SG list. | |
302 | */ | |
303 | ||
304 | BUG_ON(size != 0); | |
305 | ||
306 | host->size -= size; | |
307 | } | |
308 | ||
309 | static inline void wbsd_dma_to_sg(struct wbsd_host* host, struct mmc_data* data) | |
310 | { | |
311 | unsigned int len, i, size; | |
312 | struct scatterlist* sg; | |
313 | char* dmabuf = host->dma_buffer; | |
314 | char* sgbuf; | |
315 | ||
316 | size = host->size; | |
317 | ||
318 | sg = data->sg; | |
319 | len = data->sg_len; | |
320 | ||
321 | /* | |
322 | * Just loop through all entries. Size might not | |
323 | * be the entire list though so make sure that | |
324 | * we do not transfer too much. | |
325 | */ | |
326 | for (i = 0;i < len;i++) | |
327 | { | |
328 | sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset; | |
329 | if (size < sg[i].length) | |
330 | memcpy(sgbuf, dmabuf, size); | |
331 | else | |
332 | memcpy(sgbuf, dmabuf, sg[i].length); | |
333 | kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ); | |
334 | dmabuf += sg[i].length; | |
335 | ||
336 | if (size < sg[i].length) | |
337 | size = 0; | |
338 | else | |
339 | size -= sg[i].length; | |
340 | ||
341 | if (size == 0) | |
342 | break; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Check that we didn't get a request to transfer | |
347 | * more data than can fit into the SG list. | |
348 | */ | |
349 | ||
350 | BUG_ON(size != 0); | |
351 | ||
352 | host->size -= size; | |
353 | } | |
354 | ||
355 | /* | |
356 | * Command handling | |
357 | */ | |
358 | ||
359 | static inline void wbsd_get_short_reply(struct wbsd_host* host, | |
360 | struct mmc_command* cmd) | |
361 | { | |
362 | /* | |
363 | * Correct response type? | |
364 | */ | |
365 | if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) | |
366 | { | |
367 | cmd->error = MMC_ERR_INVALID; | |
368 | return; | |
369 | } | |
370 | ||
371 | cmd->resp[0] = | |
372 | wbsd_read_index(host, WBSD_IDX_RESP12) << 24; | |
373 | cmd->resp[0] |= | |
374 | wbsd_read_index(host, WBSD_IDX_RESP13) << 16; | |
375 | cmd->resp[0] |= | |
376 | wbsd_read_index(host, WBSD_IDX_RESP14) << 8; | |
377 | cmd->resp[0] |= | |
378 | wbsd_read_index(host, WBSD_IDX_RESP15) << 0; | |
379 | cmd->resp[1] = | |
380 | wbsd_read_index(host, WBSD_IDX_RESP16) << 24; | |
381 | } | |
382 | ||
383 | static inline void wbsd_get_long_reply(struct wbsd_host* host, | |
384 | struct mmc_command* cmd) | |
385 | { | |
386 | int i; | |
387 | ||
388 | /* | |
389 | * Correct response type? | |
390 | */ | |
391 | if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) | |
392 | { | |
393 | cmd->error = MMC_ERR_INVALID; | |
394 | return; | |
395 | } | |
396 | ||
397 | for (i = 0;i < 4;i++) | |
398 | { | |
399 | cmd->resp[i] = | |
400 | wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24; | |
401 | cmd->resp[i] |= | |
402 | wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16; | |
403 | cmd->resp[i] |= | |
404 | wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8; | |
405 | cmd->resp[i] |= | |
406 | wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0; | |
407 | } | |
408 | } | |
409 | ||
410 | static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs); | |
411 | ||
412 | static void wbsd_send_command(struct wbsd_host* host, struct mmc_command* cmd) | |
413 | { | |
414 | int i; | |
415 | u8 status, isr; | |
416 | ||
417 | DBGF("Sending cmd (%x)\n", cmd->opcode); | |
418 | ||
419 | /* | |
420 | * Clear accumulated ISR. The interrupt routine | |
421 | * will fill this one with events that occur during | |
422 | * transfer. | |
423 | */ | |
424 | host->isr = 0; | |
425 | ||
426 | /* | |
427 | * Send the command (CRC calculated by host). | |
428 | */ | |
429 | outb(cmd->opcode, host->base + WBSD_CMDR); | |
430 | for (i = 3;i >= 0;i--) | |
431 | outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR); | |
432 | ||
433 | cmd->error = MMC_ERR_NONE; | |
434 | ||
435 | /* | |
436 | * Wait for the request to complete. | |
437 | */ | |
438 | do { | |
439 | status = wbsd_read_index(host, WBSD_IDX_STATUS); | |
440 | } while (status & WBSD_CARDTRAFFIC); | |
441 | ||
442 | /* | |
443 | * Do we expect a reply? | |
444 | */ | |
445 | if ((cmd->flags & MMC_RSP_MASK) != MMC_RSP_NONE) | |
446 | { | |
447 | /* | |
448 | * Read back status. | |
449 | */ | |
450 | isr = host->isr; | |
451 | ||
452 | /* Card removed? */ | |
453 | if (isr & WBSD_INT_CARD) | |
454 | cmd->error = MMC_ERR_TIMEOUT; | |
455 | /* Timeout? */ | |
456 | else if (isr & WBSD_INT_TIMEOUT) | |
457 | cmd->error = MMC_ERR_TIMEOUT; | |
458 | /* CRC? */ | |
459 | else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC)) | |
460 | cmd->error = MMC_ERR_BADCRC; | |
461 | /* All ok */ | |
462 | else | |
463 | { | |
464 | if ((cmd->flags & MMC_RSP_MASK) == MMC_RSP_SHORT) | |
465 | wbsd_get_short_reply(host, cmd); | |
466 | else | |
467 | wbsd_get_long_reply(host, cmd); | |
468 | } | |
469 | } | |
470 | ||
471 | DBGF("Sent cmd (%x), res %d\n", cmd->opcode, cmd->error); | |
472 | } | |
473 | ||
474 | /* | |
475 | * Data functions | |
476 | */ | |
477 | ||
478 | static void wbsd_empty_fifo(struct wbsd_host* host) | |
479 | { | |
480 | struct mmc_data* data = host->mrq->cmd->data; | |
481 | char* buffer; | |
482 | int i, fsr, fifo; | |
483 | ||
484 | /* | |
485 | * Handle excessive data. | |
486 | */ | |
487 | if (data->bytes_xfered == host->size) | |
488 | return; | |
489 | ||
490 | buffer = wbsd_kmap_sg(host) + host->offset; | |
491 | ||
492 | /* | |
493 | * Drain the fifo. This has a tendency to loop longer | |
494 | * than the FIFO length (usually one block). | |
495 | */ | |
496 | while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) | |
497 | { | |
498 | /* | |
499 | * The size field in the FSR is broken so we have to | |
500 | * do some guessing. | |
501 | */ | |
502 | if (fsr & WBSD_FIFO_FULL) | |
503 | fifo = 16; | |
504 | else if (fsr & WBSD_FIFO_FUTHRE) | |
505 | fifo = 8; | |
506 | else | |
507 | fifo = 1; | |
508 | ||
509 | for (i = 0;i < fifo;i++) | |
510 | { | |
511 | *buffer = inb(host->base + WBSD_DFR); | |
512 | buffer++; | |
513 | host->offset++; | |
514 | host->remain--; | |
515 | ||
516 | data->bytes_xfered++; | |
517 | ||
518 | /* | |
519 | * Transfer done? | |
520 | */ | |
521 | if (data->bytes_xfered == host->size) | |
522 | { | |
523 | wbsd_kunmap_sg(host); | |
524 | return; | |
525 | } | |
526 | ||
527 | /* | |
528 | * End of scatter list entry? | |
529 | */ | |
530 | if (host->remain == 0) | |
531 | { | |
532 | wbsd_kunmap_sg(host); | |
533 | ||
534 | /* | |
535 | * Get next entry. Check if last. | |
536 | */ | |
537 | if (!wbsd_next_sg(host)) | |
538 | { | |
539 | /* | |
540 | * We should never reach this point. | |
541 | * It means that we're trying to | |
542 | * transfer more blocks than can fit | |
543 | * into the scatter list. | |
544 | */ | |
545 | BUG_ON(1); | |
546 | ||
547 | host->size = data->bytes_xfered; | |
548 | ||
549 | return; | |
550 | } | |
551 | ||
552 | buffer = wbsd_kmap_sg(host); | |
553 | } | |
554 | } | |
555 | } | |
556 | ||
557 | wbsd_kunmap_sg(host); | |
558 | ||
559 | /* | |
560 | * This is a very dirty hack to solve a | |
561 | * hardware problem. The chip doesn't trigger | |
562 | * FIFO threshold interrupts properly. | |
563 | */ | |
564 | if ((host->size - data->bytes_xfered) < 16) | |
565 | tasklet_schedule(&host->fifo_tasklet); | |
566 | } | |
567 | ||
568 | static void wbsd_fill_fifo(struct wbsd_host* host) | |
569 | { | |
570 | struct mmc_data* data = host->mrq->cmd->data; | |
571 | char* buffer; | |
572 | int i, fsr, fifo; | |
573 | ||
574 | /* | |
575 | * Check that we aren't being called after the | |
576 | * entire buffer has been transfered. | |
577 | */ | |
578 | if (data->bytes_xfered == host->size) | |
579 | return; | |
580 | ||
581 | buffer = wbsd_kmap_sg(host) + host->offset; | |
582 | ||
583 | /* | |
584 | * Fill the fifo. This has a tendency to loop longer | |
585 | * than the FIFO length (usually one block). | |
586 | */ | |
587 | while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) | |
588 | { | |
589 | /* | |
590 | * The size field in the FSR is broken so we have to | |
591 | * do some guessing. | |
592 | */ | |
593 | if (fsr & WBSD_FIFO_EMPTY) | |
594 | fifo = 0; | |
595 | else if (fsr & WBSD_FIFO_EMTHRE) | |
596 | fifo = 8; | |
597 | else | |
598 | fifo = 15; | |
599 | ||
600 | for (i = 16;i > fifo;i--) | |
601 | { | |
602 | outb(*buffer, host->base + WBSD_DFR); | |
603 | buffer++; | |
604 | host->offset++; | |
605 | host->remain--; | |
606 | ||
607 | data->bytes_xfered++; | |
608 | ||
609 | /* | |
610 | * Transfer done? | |
611 | */ | |
612 | if (data->bytes_xfered == host->size) | |
613 | { | |
614 | wbsd_kunmap_sg(host); | |
615 | return; | |
616 | } | |
617 | ||
618 | /* | |
619 | * End of scatter list entry? | |
620 | */ | |
621 | if (host->remain == 0) | |
622 | { | |
623 | wbsd_kunmap_sg(host); | |
624 | ||
625 | /* | |
626 | * Get next entry. Check if last. | |
627 | */ | |
628 | if (!wbsd_next_sg(host)) | |
629 | { | |
630 | /* | |
631 | * We should never reach this point. | |
632 | * It means that we're trying to | |
633 | * transfer more blocks than can fit | |
634 | * into the scatter list. | |
635 | */ | |
636 | BUG_ON(1); | |
637 | ||
638 | host->size = data->bytes_xfered; | |
639 | ||
640 | return; | |
641 | } | |
642 | ||
643 | buffer = wbsd_kmap_sg(host); | |
644 | } | |
645 | } | |
646 | } | |
647 | ||
648 | wbsd_kunmap_sg(host); | |
649 | } | |
650 | ||
651 | static void wbsd_prepare_data(struct wbsd_host* host, struct mmc_data* data) | |
652 | { | |
653 | u16 blksize; | |
654 | u8 setup; | |
655 | unsigned long dmaflags; | |
656 | ||
657 | DBGF("blksz %04x blks %04x flags %08x\n", | |
658 | 1 << data->blksz_bits, data->blocks, data->flags); | |
659 | DBGF("tsac %d ms nsac %d clk\n", | |
660 | data->timeout_ns / 1000000, data->timeout_clks); | |
661 | ||
662 | /* | |
663 | * Calculate size. | |
664 | */ | |
665 | host->size = data->blocks << data->blksz_bits; | |
666 | ||
667 | /* | |
668 | * Check timeout values for overflow. | |
669 | * (Yes, some cards cause this value to overflow). | |
670 | */ | |
671 | if (data->timeout_ns > 127000000) | |
672 | wbsd_write_index(host, WBSD_IDX_TAAC, 127); | |
673 | else | |
674 | wbsd_write_index(host, WBSD_IDX_TAAC, data->timeout_ns/1000000); | |
675 | ||
676 | if (data->timeout_clks > 255) | |
677 | wbsd_write_index(host, WBSD_IDX_NSAC, 255); | |
678 | else | |
679 | wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks); | |
680 | ||
681 | /* | |
682 | * Inform the chip of how large blocks will be | |
683 | * sent. It needs this to determine when to | |
684 | * calculate CRC. | |
685 | * | |
686 | * Space for CRC must be included in the size. | |
687 | */ | |
688 | blksize = (1 << data->blksz_bits) + 2; | |
689 | ||
690 | wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0); | |
691 | wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF); | |
692 | ||
693 | /* | |
694 | * Clear the FIFO. This is needed even for DMA | |
695 | * transfers since the chip still uses the FIFO | |
696 | * internally. | |
697 | */ | |
698 | setup = wbsd_read_index(host, WBSD_IDX_SETUP); | |
699 | setup |= WBSD_FIFO_RESET; | |
700 | wbsd_write_index(host, WBSD_IDX_SETUP, setup); | |
701 | ||
702 | /* | |
703 | * DMA transfer? | |
704 | */ | |
705 | if (host->dma >= 0) | |
706 | { | |
707 | /* | |
708 | * The buffer for DMA is only 64 kB. | |
709 | */ | |
710 | BUG_ON(host->size > 0x10000); | |
711 | if (host->size > 0x10000) | |
712 | { | |
713 | data->error = MMC_ERR_INVALID; | |
714 | return; | |
715 | } | |
716 | ||
717 | /* | |
718 | * Transfer data from the SG list to | |
719 | * the DMA buffer. | |
720 | */ | |
721 | if (data->flags & MMC_DATA_WRITE) | |
722 | wbsd_sg_to_dma(host, data); | |
723 | ||
724 | /* | |
725 | * Initialise the ISA DMA controller. | |
726 | */ | |
727 | dmaflags = claim_dma_lock(); | |
728 | disable_dma(host->dma); | |
729 | clear_dma_ff(host->dma); | |
730 | if (data->flags & MMC_DATA_READ) | |
731 | set_dma_mode(host->dma, DMA_MODE_READ & ~0x40); | |
732 | else | |
733 | set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40); | |
734 | set_dma_addr(host->dma, host->dma_addr); | |
735 | set_dma_count(host->dma, host->size); | |
736 | ||
737 | enable_dma(host->dma); | |
738 | release_dma_lock(dmaflags); | |
739 | ||
740 | /* | |
741 | * Enable DMA on the host. | |
742 | */ | |
743 | wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE); | |
744 | } | |
745 | else | |
746 | { | |
747 | /* | |
748 | * This flag is used to keep printk | |
749 | * output to a minimum. | |
750 | */ | |
751 | host->firsterr = 1; | |
752 | ||
753 | /* | |
754 | * Initialise the SG list. | |
755 | */ | |
756 | wbsd_init_sg(host, data); | |
757 | ||
758 | /* | |
759 | * Turn off DMA. | |
760 | */ | |
761 | wbsd_write_index(host, WBSD_IDX_DMA, 0); | |
762 | ||
763 | /* | |
764 | * Set up FIFO threshold levels (and fill | |
765 | * buffer if doing a write). | |
766 | */ | |
767 | if (data->flags & MMC_DATA_READ) | |
768 | { | |
769 | wbsd_write_index(host, WBSD_IDX_FIFOEN, | |
770 | WBSD_FIFOEN_FULL | 8); | |
771 | } | |
772 | else | |
773 | { | |
774 | wbsd_write_index(host, WBSD_IDX_FIFOEN, | |
775 | WBSD_FIFOEN_EMPTY | 8); | |
776 | wbsd_fill_fifo(host); | |
777 | } | |
778 | } | |
779 | ||
780 | data->error = MMC_ERR_NONE; | |
781 | } | |
782 | ||
783 | static void wbsd_finish_data(struct wbsd_host* host, struct mmc_data* data) | |
784 | { | |
785 | unsigned long dmaflags; | |
786 | int count; | |
787 | u8 status; | |
788 | ||
789 | WARN_ON(host->mrq == NULL); | |
790 | ||
791 | /* | |
792 | * Send a stop command if needed. | |
793 | */ | |
794 | if (data->stop) | |
795 | wbsd_send_command(host, data->stop); | |
796 | ||
797 | /* | |
798 | * Wait for the controller to leave data | |
799 | * transfer state. | |
800 | */ | |
801 | do | |
802 | { | |
803 | status = wbsd_read_index(host, WBSD_IDX_STATUS); | |
804 | } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE)); | |
805 | ||
806 | /* | |
807 | * DMA transfer? | |
808 | */ | |
809 | if (host->dma >= 0) | |
810 | { | |
811 | /* | |
812 | * Disable DMA on the host. | |
813 | */ | |
814 | wbsd_write_index(host, WBSD_IDX_DMA, 0); | |
815 | ||
816 | /* | |
817 | * Turn of ISA DMA controller. | |
818 | */ | |
819 | dmaflags = claim_dma_lock(); | |
820 | disable_dma(host->dma); | |
821 | clear_dma_ff(host->dma); | |
822 | count = get_dma_residue(host->dma); | |
823 | release_dma_lock(dmaflags); | |
824 | ||
825 | /* | |
826 | * Any leftover data? | |
827 | */ | |
828 | if (count) | |
829 | { | |
830 | printk(KERN_ERR DRIVER_NAME ": Incomplete DMA " | |
831 | "transfer. %d bytes left.\n", count); | |
832 | ||
833 | data->error = MMC_ERR_FAILED; | |
834 | } | |
835 | else | |
836 | { | |
837 | /* | |
838 | * Transfer data from DMA buffer to | |
839 | * SG list. | |
840 | */ | |
841 | if (data->flags & MMC_DATA_READ) | |
842 | wbsd_dma_to_sg(host, data); | |
843 | ||
844 | data->bytes_xfered = host->size; | |
845 | } | |
846 | } | |
847 | ||
848 | DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered); | |
849 | ||
850 | wbsd_request_end(host, host->mrq); | |
851 | } | |
852 | ||
853 | /* | |
854 | * MMC Callbacks | |
855 | */ | |
856 | ||
857 | static void wbsd_request(struct mmc_host* mmc, struct mmc_request* mrq) | |
858 | { | |
859 | struct wbsd_host* host = mmc_priv(mmc); | |
860 | struct mmc_command* cmd; | |
861 | ||
862 | /* | |
863 | * Disable tasklets to avoid a deadlock. | |
864 | */ | |
865 | spin_lock_bh(&host->lock); | |
866 | ||
867 | BUG_ON(host->mrq != NULL); | |
868 | ||
869 | cmd = mrq->cmd; | |
870 | ||
871 | host->mrq = mrq; | |
872 | ||
873 | /* | |
874 | * If there is no card in the slot then | |
875 | * timeout immediatly. | |
876 | */ | |
877 | if (!(inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)) | |
878 | { | |
879 | cmd->error = MMC_ERR_TIMEOUT; | |
880 | goto done; | |
881 | } | |
882 | ||
883 | /* | |
884 | * Does the request include data? | |
885 | */ | |
886 | if (cmd->data) | |
887 | { | |
888 | wbsd_prepare_data(host, cmd->data); | |
889 | ||
890 | if (cmd->data->error != MMC_ERR_NONE) | |
891 | goto done; | |
892 | } | |
893 | ||
894 | wbsd_send_command(host, cmd); | |
895 | ||
896 | /* | |
897 | * If this is a data transfer the request | |
898 | * will be finished after the data has | |
899 | * transfered. | |
900 | */ | |
901 | if (cmd->data && (cmd->error == MMC_ERR_NONE)) | |
902 | { | |
903 | /* | |
904 | * Dirty fix for hardware bug. | |
905 | */ | |
906 | if (host->dma == -1) | |
907 | tasklet_schedule(&host->fifo_tasklet); | |
908 | ||
909 | spin_unlock_bh(&host->lock); | |
910 | ||
911 | return; | |
912 | } | |
913 | ||
914 | done: | |
915 | wbsd_request_end(host, mrq); | |
916 | ||
917 | spin_unlock_bh(&host->lock); | |
918 | } | |
919 | ||
920 | static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios) | |
921 | { | |
922 | struct wbsd_host* host = mmc_priv(mmc); | |
923 | u8 clk, setup, pwr; | |
924 | ||
925 | DBGF("clock %uHz busmode %u powermode %u Vdd %u\n", | |
926 | ios->clock, ios->bus_mode, ios->power_mode, ios->vdd); | |
927 | ||
928 | spin_lock_bh(&host->lock); | |
929 | ||
930 | /* | |
931 | * Reset the chip on each power off. | |
932 | * Should clear out any weird states. | |
933 | */ | |
934 | if (ios->power_mode == MMC_POWER_OFF) | |
935 | wbsd_init_device(host); | |
936 | ||
937 | if (ios->clock >= 24000000) | |
938 | clk = WBSD_CLK_24M; | |
939 | else if (ios->clock >= 16000000) | |
940 | clk = WBSD_CLK_16M; | |
941 | else if (ios->clock >= 12000000) | |
942 | clk = WBSD_CLK_12M; | |
943 | else | |
944 | clk = WBSD_CLK_375K; | |
945 | ||
946 | /* | |
947 | * Only write to the clock register when | |
948 | * there is an actual change. | |
949 | */ | |
950 | if (clk != host->clk) | |
951 | { | |
952 | wbsd_write_index(host, WBSD_IDX_CLK, clk); | |
953 | host->clk = clk; | |
954 | } | |
955 | ||
956 | if (ios->power_mode != MMC_POWER_OFF) | |
957 | { | |
958 | /* | |
959 | * Power up card. | |
960 | */ | |
961 | pwr = inb(host->base + WBSD_CSR); | |
962 | pwr &= ~WBSD_POWER_N; | |
963 | outb(pwr, host->base + WBSD_CSR); | |
964 | ||
965 | /* | |
966 | * This behaviour is stolen from the | |
967 | * Windows driver. Don't know why, but | |
968 | * it is needed. | |
969 | */ | |
970 | setup = wbsd_read_index(host, WBSD_IDX_SETUP); | |
971 | if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) | |
972 | setup |= WBSD_DAT3_H; | |
973 | else | |
974 | setup &= ~WBSD_DAT3_H; | |
975 | wbsd_write_index(host, WBSD_IDX_SETUP, setup); | |
976 | ||
977 | mdelay(1); | |
978 | } | |
979 | ||
980 | spin_unlock_bh(&host->lock); | |
981 | } | |
982 | ||
983 | /* | |
984 | * Tasklets | |
985 | */ | |
986 | ||
987 | inline static struct mmc_data* wbsd_get_data(struct wbsd_host* host) | |
988 | { | |
989 | WARN_ON(!host->mrq); | |
990 | if (!host->mrq) | |
991 | return NULL; | |
992 | ||
993 | WARN_ON(!host->mrq->cmd); | |
994 | if (!host->mrq->cmd) | |
995 | return NULL; | |
996 | ||
997 | WARN_ON(!host->mrq->cmd->data); | |
998 | if (!host->mrq->cmd->data) | |
999 | return NULL; | |
1000 | ||
1001 | return host->mrq->cmd->data; | |
1002 | } | |
1003 | ||
1004 | static void wbsd_tasklet_card(unsigned long param) | |
1005 | { | |
1006 | struct wbsd_host* host = (struct wbsd_host*)param; | |
1007 | u8 csr; | |
1008 | ||
1009 | spin_lock(&host->lock); | |
1010 | ||
1011 | csr = inb(host->base + WBSD_CSR); | |
1012 | WARN_ON(csr == 0xff); | |
1013 | ||
1014 | if (csr & WBSD_CARDPRESENT) | |
1015 | DBG("Card inserted\n"); | |
1016 | else | |
1017 | { | |
1018 | DBG("Card removed\n"); | |
1019 | ||
1020 | if (host->mrq) | |
1021 | { | |
1022 | printk(KERN_ERR DRIVER_NAME | |
1023 | ": Card removed during transfer!\n"); | |
1024 | wbsd_reset(host); | |
1025 | ||
1026 | host->mrq->cmd->error = MMC_ERR_FAILED; | |
1027 | tasklet_schedule(&host->finish_tasklet); | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * Unlock first since we might get a call back. | |
1033 | */ | |
1034 | spin_unlock(&host->lock); | |
1035 | ||
1036 | mmc_detect_change(host->mmc); | |
1037 | } | |
1038 | ||
1039 | static void wbsd_tasklet_fifo(unsigned long param) | |
1040 | { | |
1041 | struct wbsd_host* host = (struct wbsd_host*)param; | |
1042 | struct mmc_data* data; | |
1043 | ||
1044 | spin_lock(&host->lock); | |
1045 | ||
1046 | if (!host->mrq) | |
1047 | goto end; | |
1048 | ||
1049 | data = wbsd_get_data(host); | |
1050 | if (!data) | |
1051 | goto end; | |
1052 | ||
1053 | if (data->flags & MMC_DATA_WRITE) | |
1054 | wbsd_fill_fifo(host); | |
1055 | else | |
1056 | wbsd_empty_fifo(host); | |
1057 | ||
1058 | /* | |
1059 | * Done? | |
1060 | */ | |
1061 | if (host->size == data->bytes_xfered) | |
1062 | { | |
1063 | wbsd_write_index(host, WBSD_IDX_FIFOEN, 0); | |
1064 | tasklet_schedule(&host->finish_tasklet); | |
1065 | } | |
1066 | ||
1067 | end: | |
1068 | spin_unlock(&host->lock); | |
1069 | } | |
1070 | ||
1071 | static void wbsd_tasklet_crc(unsigned long param) | |
1072 | { | |
1073 | struct wbsd_host* host = (struct wbsd_host*)param; | |
1074 | struct mmc_data* data; | |
1075 | ||
1076 | spin_lock(&host->lock); | |
1077 | ||
1078 | if (!host->mrq) | |
1079 | goto end; | |
1080 | ||
1081 | data = wbsd_get_data(host); | |
1082 | if (!data) | |
1083 | goto end; | |
1084 | ||
1085 | DBGF("CRC error\n"); | |
1086 | ||
1087 | data->error = MMC_ERR_BADCRC; | |
1088 | ||
1089 | tasklet_schedule(&host->finish_tasklet); | |
1090 | ||
1091 | end: | |
1092 | spin_unlock(&host->lock); | |
1093 | } | |
1094 | ||
1095 | static void wbsd_tasklet_timeout(unsigned long param) | |
1096 | { | |
1097 | struct wbsd_host* host = (struct wbsd_host*)param; | |
1098 | struct mmc_data* data; | |
1099 | ||
1100 | spin_lock(&host->lock); | |
1101 | ||
1102 | if (!host->mrq) | |
1103 | goto end; | |
1104 | ||
1105 | data = wbsd_get_data(host); | |
1106 | if (!data) | |
1107 | goto end; | |
1108 | ||
1109 | DBGF("Timeout\n"); | |
1110 | ||
1111 | data->error = MMC_ERR_TIMEOUT; | |
1112 | ||
1113 | tasklet_schedule(&host->finish_tasklet); | |
1114 | ||
1115 | end: | |
1116 | spin_unlock(&host->lock); | |
1117 | } | |
1118 | ||
1119 | static void wbsd_tasklet_finish(unsigned long param) | |
1120 | { | |
1121 | struct wbsd_host* host = (struct wbsd_host*)param; | |
1122 | struct mmc_data* data; | |
1123 | ||
1124 | spin_lock(&host->lock); | |
1125 | ||
1126 | WARN_ON(!host->mrq); | |
1127 | if (!host->mrq) | |
1128 | goto end; | |
1129 | ||
1130 | data = wbsd_get_data(host); | |
1131 | if (!data) | |
1132 | goto end; | |
1133 | ||
1134 | wbsd_finish_data(host, data); | |
1135 | ||
1136 | end: | |
1137 | spin_unlock(&host->lock); | |
1138 | } | |
1139 | ||
1140 | static void wbsd_tasklet_block(unsigned long param) | |
1141 | { | |
1142 | struct wbsd_host* host = (struct wbsd_host*)param; | |
1143 | struct mmc_data* data; | |
1144 | ||
1145 | spin_lock(&host->lock); | |
1146 | ||
1147 | if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) != | |
1148 | WBSD_CRC_OK) | |
1149 | { | |
1150 | data = wbsd_get_data(host); | |
1151 | if (!data) | |
1152 | goto end; | |
1153 | ||
1154 | DBGF("CRC error\n"); | |
1155 | ||
1156 | data->error = MMC_ERR_BADCRC; | |
1157 | ||
1158 | tasklet_schedule(&host->finish_tasklet); | |
1159 | } | |
1160 | ||
1161 | end: | |
1162 | spin_unlock(&host->lock); | |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Interrupt handling | |
1167 | */ | |
1168 | ||
1169 | static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs) | |
1170 | { | |
1171 | struct wbsd_host* host = dev_id; | |
1172 | int isr; | |
1173 | ||
1174 | isr = inb(host->base + WBSD_ISR); | |
1175 | ||
1176 | /* | |
1177 | * Was it actually our hardware that caused the interrupt? | |
1178 | */ | |
1179 | if (isr == 0xff || isr == 0x00) | |
1180 | return IRQ_NONE; | |
1181 | ||
1182 | host->isr |= isr; | |
1183 | ||
1184 | /* | |
1185 | * Schedule tasklets as needed. | |
1186 | */ | |
1187 | if (isr & WBSD_INT_CARD) | |
1188 | tasklet_schedule(&host->card_tasklet); | |
1189 | if (isr & WBSD_INT_FIFO_THRE) | |
1190 | tasklet_schedule(&host->fifo_tasklet); | |
1191 | if (isr & WBSD_INT_CRC) | |
1192 | tasklet_hi_schedule(&host->crc_tasklet); | |
1193 | if (isr & WBSD_INT_TIMEOUT) | |
1194 | tasklet_hi_schedule(&host->timeout_tasklet); | |
1195 | if (isr & WBSD_INT_BUSYEND) | |
1196 | tasklet_hi_schedule(&host->block_tasklet); | |
1197 | if (isr & WBSD_INT_TC) | |
1198 | tasklet_schedule(&host->finish_tasklet); | |
1199 | ||
1200 | return IRQ_HANDLED; | |
1201 | } | |
1202 | ||
1203 | /* | |
1204 | * Support functions for probe | |
1205 | */ | |
1206 | ||
1207 | static int wbsd_scan(struct wbsd_host* host) | |
1208 | { | |
1209 | int i, j, k; | |
1210 | int id; | |
1211 | ||
1212 | /* | |
1213 | * Iterate through all ports, all codes to | |
1214 | * find hardware that is in our known list. | |
1215 | */ | |
1216 | for (i = 0;i < sizeof(config_ports)/sizeof(int);i++) | |
1217 | { | |
1218 | if (!request_region(config_ports[i], 2, DRIVER_NAME)) | |
1219 | continue; | |
1220 | ||
1221 | for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++) | |
1222 | { | |
1223 | id = 0xFFFF; | |
1224 | ||
1225 | outb(unlock_codes[j], config_ports[i]); | |
1226 | outb(unlock_codes[j], config_ports[i]); | |
1227 | ||
1228 | outb(WBSD_CONF_ID_HI, config_ports[i]); | |
1229 | id = inb(config_ports[i] + 1) << 8; | |
1230 | ||
1231 | outb(WBSD_CONF_ID_LO, config_ports[i]); | |
1232 | id |= inb(config_ports[i] + 1); | |
1233 | ||
1234 | for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++) | |
1235 | { | |
1236 | if (id == valid_ids[k]) | |
1237 | { | |
1238 | host->chip_id = id; | |
1239 | host->config = config_ports[i]; | |
1240 | host->unlock_code = unlock_codes[i]; | |
1241 | ||
1242 | return 0; | |
1243 | } | |
1244 | } | |
1245 | ||
1246 | if (id != 0xFFFF) | |
1247 | { | |
1248 | DBG("Unknown hardware (id %x) found at %x\n", | |
1249 | id, config_ports[i]); | |
1250 | } | |
1251 | ||
1252 | outb(LOCK_CODE, config_ports[i]); | |
1253 | } | |
1254 | ||
1255 | release_region(config_ports[i], 2); | |
1256 | } | |
1257 | ||
1258 | return -ENODEV; | |
1259 | } | |
1260 | ||
1261 | static int wbsd_request_regions(struct wbsd_host* host) | |
1262 | { | |
1263 | if (io & 0x7) | |
1264 | return -EINVAL; | |
1265 | ||
1266 | if (!request_region(io, 8, DRIVER_NAME)) | |
1267 | return -EIO; | |
1268 | ||
1269 | host->base = io; | |
1270 | ||
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | static void wbsd_release_regions(struct wbsd_host* host) | |
1275 | { | |
1276 | if (host->base) | |
1277 | release_region(host->base, 8); | |
1278 | ||
1279 | if (host->config) | |
1280 | release_region(host->config, 2); | |
1281 | } | |
1282 | ||
1283 | static void wbsd_init_dma(struct wbsd_host* host) | |
1284 | { | |
1285 | host->dma = -1; | |
1286 | ||
1287 | if (dma < 0) | |
1288 | return; | |
1289 | ||
1290 | if (request_dma(dma, DRIVER_NAME)) | |
1291 | goto err; | |
1292 | ||
1293 | /* | |
1294 | * We need to allocate a special buffer in | |
1295 | * order for ISA to be able to DMA to it. | |
1296 | */ | |
1297 | host->dma_buffer = kmalloc(65536, | |
1298 | GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN); | |
1299 | if (!host->dma_buffer) | |
1300 | goto free; | |
1301 | ||
1302 | /* | |
1303 | * Translate the address to a physical address. | |
1304 | */ | |
1305 | host->dma_addr = isa_virt_to_bus(host->dma_buffer); | |
1306 | ||
1307 | /* | |
1308 | * ISA DMA must be aligned on a 64k basis. | |
1309 | */ | |
1310 | if ((host->dma_addr & 0xffff) != 0) | |
1311 | goto kfree; | |
1312 | /* | |
1313 | * ISA cannot access memory above 16 MB. | |
1314 | */ | |
1315 | else if (host->dma_addr >= 0x1000000) | |
1316 | goto kfree; | |
1317 | ||
1318 | host->dma = dma; | |
1319 | ||
1320 | return; | |
1321 | ||
1322 | kfree: | |
1323 | /* | |
1324 | * If we've gotten here then there is some kind of alignment bug | |
1325 | */ | |
1326 | BUG_ON(1); | |
1327 | ||
1328 | kfree(host->dma_buffer); | |
1329 | host->dma_buffer = NULL; | |
1330 | ||
1331 | free: | |
1332 | free_dma(dma); | |
1333 | ||
1334 | err: | |
1335 | printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. " | |
1336 | "Falling back on FIFO.\n", dma); | |
1337 | } | |
1338 | ||
1339 | static struct mmc_host_ops wbsd_ops = { | |
1340 | .request = wbsd_request, | |
1341 | .set_ios = wbsd_set_ios, | |
1342 | }; | |
1343 | ||
1344 | /* | |
1345 | * Device probe | |
1346 | */ | |
1347 | ||
1348 | static int wbsd_probe(struct device* dev) | |
1349 | { | |
1350 | struct wbsd_host* host = NULL; | |
1351 | struct mmc_host* mmc = NULL; | |
1352 | int ret; | |
1353 | ||
1354 | /* | |
1355 | * Allocate MMC structure. | |
1356 | */ | |
1357 | mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev); | |
1358 | if (!mmc) | |
1359 | return -ENOMEM; | |
1360 | ||
1361 | host = mmc_priv(mmc); | |
1362 | host->mmc = mmc; | |
1363 | ||
1364 | /* | |
1365 | * Scan for hardware. | |
1366 | */ | |
1367 | ret = wbsd_scan(host); | |
1368 | if (ret) | |
1369 | goto freemmc; | |
1370 | ||
1371 | /* | |
1372 | * Reset the chip. | |
1373 | */ | |
1374 | wbsd_write_config(host, WBSD_CONF_SWRST, 1); | |
1375 | wbsd_write_config(host, WBSD_CONF_SWRST, 0); | |
1376 | ||
1377 | /* | |
1378 | * Allocate I/O ports. | |
1379 | */ | |
1380 | ret = wbsd_request_regions(host); | |
1381 | if (ret) | |
1382 | goto release; | |
1383 | ||
1384 | /* | |
1385 | * Set host parameters. | |
1386 | */ | |
1387 | mmc->ops = &wbsd_ops; | |
1388 | mmc->f_min = 375000; | |
1389 | mmc->f_max = 24000000; | |
1390 | mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34; | |
1391 | ||
1392 | spin_lock_init(&host->lock); | |
1393 | ||
1394 | /* | |
1395 | * Select SD/MMC function. | |
1396 | */ | |
1397 | wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); | |
1398 | ||
1399 | /* | |
1400 | * Set up card detection. | |
1401 | */ | |
1402 | wbsd_write_config(host, WBSD_CONF_PINS, 0x02); | |
1403 | ||
1404 | /* | |
1405 | * Configure I/O port. | |
1406 | */ | |
1407 | wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8); | |
1408 | wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff); | |
1409 | ||
1410 | /* | |
1411 | * Allocate interrupt. | |
1412 | */ | |
1413 | ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host); | |
1414 | if (ret) | |
1415 | goto release; | |
1416 | ||
1417 | host->irq = irq; | |
1418 | ||
1419 | /* | |
1420 | * Set up tasklets. | |
1421 | */ | |
1422 | tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host); | |
1423 | tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host); | |
1424 | tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host); | |
1425 | tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host); | |
1426 | tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host); | |
1427 | tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host); | |
1428 | ||
1429 | /* | |
1430 | * Configure interrupt. | |
1431 | */ | |
1432 | wbsd_write_config(host, WBSD_CONF_IRQ, host->irq); | |
1433 | ||
1434 | /* | |
1435 | * Allocate DMA. | |
1436 | */ | |
1437 | wbsd_init_dma(host); | |
1438 | ||
1439 | /* | |
1440 | * If all went well, then configure DMA. | |
1441 | */ | |
1442 | if (host->dma >= 0) | |
1443 | wbsd_write_config(host, WBSD_CONF_DRQ, host->dma); | |
1444 | ||
1445 | /* | |
1446 | * Maximum number of segments. Worst case is one sector per segment | |
1447 | * so this will be 64kB/512. | |
1448 | */ | |
1449 | mmc->max_hw_segs = 128; | |
1450 | mmc->max_phys_segs = 128; | |
1451 | ||
1452 | /* | |
1453 | * Maximum number of sectors in one transfer. Also limited by 64kB | |
1454 | * buffer. | |
1455 | */ | |
1456 | mmc->max_sectors = 128; | |
1457 | ||
1458 | /* | |
1459 | * Maximum segment size. Could be one segment with the maximum number | |
1460 | * of segments. | |
1461 | */ | |
1462 | mmc->max_seg_size = mmc->max_sectors * 512; | |
1463 | ||
1464 | /* | |
1465 | * Enable chip. | |
1466 | */ | |
1467 | wbsd_write_config(host, WBSD_CONF_ENABLE, 1); | |
1468 | ||
1469 | /* | |
1470 | * Power up chip. | |
1471 | */ | |
1472 | wbsd_write_config(host, WBSD_CONF_POWER, 0x20); | |
1473 | ||
1474 | /* | |
1475 | * Power Management stuff. No idea how this works. | |
1476 | * Not tested. | |
1477 | */ | |
1478 | #ifdef CONFIG_PM | |
1479 | wbsd_write_config(host, WBSD_CONF_PME, 0xA0); | |
1480 | #endif | |
1481 | ||
1482 | /* | |
1483 | * Reset the chip into a known state. | |
1484 | */ | |
1485 | wbsd_init_device(host); | |
1486 | ||
1487 | dev_set_drvdata(dev, mmc); | |
1488 | ||
1489 | /* | |
1490 | * Add host to MMC layer. | |
1491 | */ | |
1492 | mmc_add_host(mmc); | |
1493 | ||
1494 | printk(KERN_INFO "%s: W83L51xD id %x at 0x%x irq %d dma %d\n", | |
1495 | mmc->host_name, (int)host->chip_id, (int)host->base, | |
1496 | (int)host->irq, (int)host->dma); | |
1497 | ||
1498 | return 0; | |
1499 | ||
1500 | release: | |
1501 | wbsd_release_regions(host); | |
1502 | ||
1503 | freemmc: | |
1504 | mmc_free_host(mmc); | |
1505 | ||
1506 | return ret; | |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | * Device remove | |
1511 | */ | |
1512 | ||
1513 | static int wbsd_remove(struct device* dev) | |
1514 | { | |
1515 | struct mmc_host* mmc = dev_get_drvdata(dev); | |
1516 | struct wbsd_host* host; | |
1517 | ||
1518 | if (!mmc) | |
1519 | return 0; | |
1520 | ||
1521 | host = mmc_priv(mmc); | |
1522 | ||
1523 | /* | |
1524 | * Unregister host with MMC layer. | |
1525 | */ | |
1526 | mmc_remove_host(mmc); | |
1527 | ||
1528 | /* | |
1529 | * Power down the SD/MMC function. | |
1530 | */ | |
1531 | wbsd_unlock_config(host); | |
1532 | wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); | |
1533 | wbsd_write_config(host, WBSD_CONF_ENABLE, 0); | |
1534 | wbsd_lock_config(host); | |
1535 | ||
1536 | /* | |
1537 | * Free resources. | |
1538 | */ | |
1539 | if (host->dma_buffer) | |
1540 | kfree(host->dma_buffer); | |
1541 | ||
1542 | if (host->dma >= 0) | |
1543 | free_dma(host->dma); | |
1544 | ||
1545 | free_irq(host->irq, host); | |
1546 | ||
1547 | tasklet_kill(&host->card_tasklet); | |
1548 | tasklet_kill(&host->fifo_tasklet); | |
1549 | tasklet_kill(&host->crc_tasklet); | |
1550 | tasklet_kill(&host->timeout_tasklet); | |
1551 | tasklet_kill(&host->finish_tasklet); | |
1552 | tasklet_kill(&host->block_tasklet); | |
1553 | ||
1554 | wbsd_release_regions(host); | |
1555 | ||
1556 | mmc_free_host(mmc); | |
1557 | ||
1558 | return 0; | |
1559 | } | |
1560 | ||
1561 | /* | |
1562 | * Power management | |
1563 | */ | |
1564 | ||
1565 | #ifdef CONFIG_PM | |
e5378ca8 | 1566 | static int wbsd_suspend(struct device *dev, pm_message_t state, u32 level) |
1da177e4 LT |
1567 | { |
1568 | DBGF("Not yet supported\n"); | |
1569 | ||
1570 | return 0; | |
1571 | } | |
1572 | ||
1573 | static int wbsd_resume(struct device *dev, u32 level) | |
1574 | { | |
1575 | DBGF("Not yet supported\n"); | |
1576 | ||
1577 | return 0; | |
1578 | } | |
1579 | #else | |
1580 | #define wbsd_suspend NULL | |
1581 | #define wbsd_resume NULL | |
1582 | #endif | |
1583 | ||
1584 | static void wbsd_release(struct device *dev) | |
1585 | { | |
1586 | } | |
1587 | ||
1588 | static struct platform_device wbsd_device = { | |
1589 | .name = DRIVER_NAME, | |
1590 | .id = -1, | |
1591 | .dev = { | |
1592 | .release = wbsd_release, | |
1593 | }, | |
1594 | }; | |
1595 | ||
1596 | static struct device_driver wbsd_driver = { | |
1597 | .name = DRIVER_NAME, | |
1598 | .bus = &platform_bus_type, | |
1599 | .probe = wbsd_probe, | |
1600 | .remove = wbsd_remove, | |
1601 | ||
1602 | .suspend = wbsd_suspend, | |
1603 | .resume = wbsd_resume, | |
1604 | }; | |
1605 | ||
1606 | /* | |
1607 | * Module loading/unloading | |
1608 | */ | |
1609 | ||
1610 | static int __init wbsd_drv_init(void) | |
1611 | { | |
1612 | int result; | |
1613 | ||
1614 | printk(KERN_INFO DRIVER_NAME | |
1615 | ": Winbond W83L51xD SD/MMC card interface driver, " | |
1616 | DRIVER_VERSION "\n"); | |
1617 | printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n"); | |
1618 | ||
1619 | result = driver_register(&wbsd_driver); | |
1620 | if (result < 0) | |
1621 | return result; | |
1622 | ||
1623 | result = platform_device_register(&wbsd_device); | |
1624 | if (result < 0) | |
1625 | return result; | |
1626 | ||
1627 | return 0; | |
1628 | } | |
1629 | ||
1630 | static void __exit wbsd_drv_exit(void) | |
1631 | { | |
1632 | platform_device_unregister(&wbsd_device); | |
1633 | ||
1634 | driver_unregister(&wbsd_driver); | |
1635 | ||
1636 | DBG("unloaded\n"); | |
1637 | } | |
1638 | ||
1639 | module_init(wbsd_drv_init); | |
1640 | module_exit(wbsd_drv_exit); | |
1641 | module_param(io, uint, 0444); | |
1642 | module_param(irq, uint, 0444); | |
1643 | module_param(dma, int, 0444); | |
1644 | ||
1645 | MODULE_LICENSE("GPL"); | |
1646 | MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver"); | |
1647 | MODULE_VERSION(DRIVER_VERSION); | |
1648 | ||
1649 | MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)"); | |
1650 | MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)"); | |
1651 | MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)"); |