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[ARM] pxa: Gumstix Verdex PCMCIA support
[linux-2.6/verdex.git] / drivers / mmc / host / cb710-mmc.c
blob4e72964a7b431345c37cd0868056de1145b1c76f
1 /*
2 * cb710/mmc.c
3 *
4 * Copyright by Michał Mirosław, 2008-2009
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/kernel.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/pci.h>
14 #include <linux/delay.h>
15 #include "cb710-mmc.h"
16
17 static const u8 cb710_clock_divider_log2[8] = {
18 /* 1, 2, 4, 8, 16, 32, 128, 512 */
19 0, 1, 2, 3, 4, 5, 7, 9
20 };
21 #define CB710_MAX_DIVIDER_IDX \
22 (ARRAY_SIZE(cb710_clock_divider_log2) - 1)
23
24 static const u8 cb710_src_freq_mhz[16] = {
25 33, 10, 20, 25, 30, 35, 40, 45,
26 50, 55, 60, 65, 70, 75, 80, 85
27 };
28
29 static void cb710_mmc_set_clock(struct mmc_host *mmc, int hz)
30 {
31 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
32 struct pci_dev *pdev = cb710_slot_to_chip(slot)->pdev;
33 u32 src_freq_idx;
34 u32 divider_idx;
35 int src_hz;
36
37 /* this is magic, unverifiable for me, unless I get
38 * MMC card with cables connected to bus signals */
39 pci_read_config_dword(pdev, 0x48, &src_freq_idx);
40 src_freq_idx = (src_freq_idx >> 16) & 0xF;
41 src_hz = cb710_src_freq_mhz[src_freq_idx] * 1000000;
42
43 for (divider_idx = 0; divider_idx < CB710_MAX_DIVIDER_IDX; ++divider_idx) {
44 if (hz >= src_hz >> cb710_clock_divider_log2[divider_idx])
45 break;
46 }
47
48 if (src_freq_idx)
49 divider_idx |= 0x8;
50
51 cb710_pci_update_config_reg(pdev, 0x40, ~0xF0000000, divider_idx << 28);
52
53 dev_dbg(cb710_slot_dev(slot),
54 "clock set to %d Hz, wanted %d Hz; flag = %d\n",
55 src_hz >> cb710_clock_divider_log2[divider_idx & 7],
56 hz, (divider_idx & 8) != 0);
57 }
58
59 static void __cb710_mmc_enable_irq(struct cb710_slot *slot,
60 unsigned short enable, unsigned short mask)
61 {
62 /* clear global IE
63 * - it gets set later if any interrupt sources are enabled */
64 mask |= CB710_MMC_IE_IRQ_ENABLE;
65
66 /* look like interrupt is fired whenever
67 * WORD[0x0C] & WORD[0x10] != 0;
68 * -> bit 15 port 0x0C seems to be global interrupt enable
69 */
70
71 enable = (cb710_read_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT)
72 & ~mask) | enable;
73
74 if (enable)
75 enable |= CB710_MMC_IE_IRQ_ENABLE;
76
77 cb710_write_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT, enable);
78 }
79
80 static void cb710_mmc_enable_irq(struct cb710_slot *slot,
81 unsigned short enable, unsigned short mask)
82 {
83 struct cb710_mmc_reader *reader = mmc_priv(cb710_slot_to_mmc(slot));
84 unsigned long flags;
85
86 spin_lock_irqsave(&reader->irq_lock, flags);
87 /* this is the only thing irq_lock protects */
88 __cb710_mmc_enable_irq(slot, enable, mask);
89 spin_unlock_irqrestore(&reader->irq_lock, flags);
90 }
91
92 static void cb710_mmc_reset_events(struct cb710_slot *slot)
93 {
94 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT, 0xFF);
95 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT, 0xFF);
96 cb710_write_port_8(slot, CB710_MMC_STATUS2_PORT, 0xFF);
97 }
98
99 static int cb710_mmc_is_card_inserted(struct cb710_slot *slot)
100 {
101 return cb710_read_port_8(slot, CB710_MMC_STATUS3_PORT)
102 & CB710_MMC_S3_CARD_DETECTED;
103 }
104
105 static void cb710_mmc_enable_4bit_data(struct cb710_slot *slot, int enable)
106 {
107 dev_dbg(cb710_slot_dev(slot), "configuring %d-data-line%s mode\n",
108 enable ? 4 : 1, enable ? "s" : "");
109 if (enable)
110 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT,
111 CB710_MMC_C1_4BIT_DATA_BUS, 0);
112 else
113 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT,
114 0, CB710_MMC_C1_4BIT_DATA_BUS);
115 }
116
117 static int cb710_check_event(struct cb710_slot *slot, u8 what)
118 {
119 u16 status;
120
121 status = cb710_read_port_16(slot, CB710_MMC_STATUS_PORT);
122
123 if (status & CB710_MMC_S0_FIFO_UNDERFLOW) {
124 /* it is just a guess, so log it */
125 dev_dbg(cb710_slot_dev(slot),
126 "CHECK : ignoring bit 6 in status %04X\n", status);
127 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT,
128 CB710_MMC_S0_FIFO_UNDERFLOW);
129 status &= ~CB710_MMC_S0_FIFO_UNDERFLOW;
130 }
131
132 if (status & CB710_MMC_STATUS_ERROR_EVENTS) {
133 dev_dbg(cb710_slot_dev(slot),
134 "CHECK : returning EIO on status %04X\n", status);
135 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT, status & 0xFF);
136 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT,
137 CB710_MMC_S1_RESET);
138 return -EIO;
139 }
140
141 /* 'what' is a bit in MMC_STATUS1 */
142 if ((status >> 8) & what) {
143 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT, what);
144 return 1;
145 }
146
147 return 0;
148 }
149
150 static int cb710_wait_for_event(struct cb710_slot *slot, u8 what)
151 {
152 int err = 0;
153 unsigned limit = 2000000; /* FIXME: real timeout */
154
155 #ifdef CONFIG_CB710_DEBUG
156 u32 e, x;
157 e = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
158 #endif
159
160 while (!(err = cb710_check_event(slot, what))) {
161 if (!--limit) {
162 cb710_dump_regs(cb710_slot_to_chip(slot),
163 CB710_DUMP_REGS_MMC);
164 err = -ETIMEDOUT;
165 break;
166 }
167 udelay(1);
168 }
169
170 #ifdef CONFIG_CB710_DEBUG
171 x = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
172
173 limit = 2000000 - limit;
174 if (limit > 100)
175 dev_dbg(cb710_slot_dev(slot),
176 "WAIT10: waited %d loops, what %d, entry val %08X, exit val %08X\n",
177 limit, what, e, x);
178 #endif
179 return err < 0 ? err : 0;
180 }
181
182
183 static int cb710_wait_while_busy(struct cb710_slot *slot, uint8_t mask)
184 {
185 unsigned limit = 500000; /* FIXME: real timeout */
186 int err = 0;
187
188 #ifdef CONFIG_CB710_DEBUG
189 u32 e, x;
190 e = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
191 #endif
192
193 while (cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT) & mask) {
194 if (!--limit) {
195 cb710_dump_regs(cb710_slot_to_chip(slot),
196 CB710_DUMP_REGS_MMC);
197 err = -ETIMEDOUT;
198 break;
199 }
200 udelay(1);
201 }
202
203 #ifdef CONFIG_CB710_DEBUG
204 x = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
205
206 limit = 500000 - limit;
207 if (limit > 100)
208 dev_dbg(cb710_slot_dev(slot),
209 "WAIT12: waited %d loops, mask %02X, entry val %08X, exit val %08X\n",
210 limit, mask, e, x);
211 #endif
212 return 0;
213 }
214
215 static void cb710_mmc_set_transfer_size(struct cb710_slot *slot,
216 size_t count, size_t blocksize)
217 {
218 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
219 cb710_write_port_32(slot, CB710_MMC_TRANSFER_SIZE_PORT,
220 ((count - 1) << 16)|(blocksize - 1));
221
222 dev_vdbg(cb710_slot_dev(slot), "set up for %zu block%s of %zu bytes\n",
223 count, count == 1 ? "" : "s", blocksize);
224 }
225
226 static void cb710_mmc_fifo_hack(struct cb710_slot *slot)
227 {
228 /* without this, received data is prepended with 8-bytes of zeroes */
229 u32 r1, r2;
230 int ok = 0;
231
232 r1 = cb710_read_port_32(slot, CB710_MMC_DATA_PORT);
233 r2 = cb710_read_port_32(slot, CB710_MMC_DATA_PORT);
234 if (cb710_read_port_8(slot, CB710_MMC_STATUS0_PORT)
235 & CB710_MMC_S0_FIFO_UNDERFLOW) {
236 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT,
237 CB710_MMC_S0_FIFO_UNDERFLOW);
238 ok = 1;
239 }
240
241 dev_dbg(cb710_slot_dev(slot),
242 "FIFO-read-hack: expected STATUS0 bit was %s\n",
243 ok ? "set." : "NOT SET!");
244 dev_dbg(cb710_slot_dev(slot),
245 "FIFO-read-hack: dwords ignored: %08X %08X - %s\n",
246 r1, r2, (r1|r2) ? "BAD (NOT ZERO)!" : "ok");
247 }
248
249 static int cb710_mmc_receive_pio(struct cb710_slot *slot,
250 struct sg_mapping_iter *miter, size_t dw_count)
251 {
252 if (!(cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT) & CB710_MMC_S2_FIFO_READY)) {
253 int err = cb710_wait_for_event(slot,
254 CB710_MMC_S1_PIO_TRANSFER_DONE);
255 if (err)
256 return err;
257 }
258
259 cb710_sg_dwiter_write_from_io(miter,
260 slot->iobase + CB710_MMC_DATA_PORT, dw_count);
261
262 return 0;
263 }
264
265 static bool cb710_is_transfer_size_supported(struct mmc_data *data)
266 {
267 return !(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8));
268 }
269
270 static int cb710_mmc_receive(struct cb710_slot *slot, struct mmc_data *data)
271 {
272 struct sg_mapping_iter miter;
273 size_t len, blocks = data->blocks;
274 int err = 0;
275
276 /* TODO: I don't know how/if the hardware handles non-16B-boundary blocks
277 * except single 8B block */
278 if (unlikely(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8)))
279 return -EINVAL;
280
281 sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_TO_SG);
282
283 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
284 15, CB710_MMC_C2_READ_PIO_SIZE_MASK);
285
286 cb710_mmc_fifo_hack(slot);
287
288 while (blocks-- > 0) {
289 len = data->blksz;
290
291 while (len >= 16) {
292 err = cb710_mmc_receive_pio(slot, &miter, 4);
293 if (err)
294 goto out;
295 len -= 16;
296 }
297
298 if (!len)
299 continue;
300
301 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
302 len - 1, CB710_MMC_C2_READ_PIO_SIZE_MASK);
303
304 len = (len >= 8) ? 4 : 2;
305 err = cb710_mmc_receive_pio(slot, &miter, len);
306 if (err)
307 goto out;
308 }
309 out:
310 sg_miter_stop(&miter);
311 return err;
312 }
313
314 static int cb710_mmc_send(struct cb710_slot *slot, struct mmc_data *data)
315 {
316 struct sg_mapping_iter miter;
317 size_t len, blocks = data->blocks;
318 int err = 0;
319
320 /* TODO: I don't know how/if the hardware handles multiple
321 * non-16B-boundary blocks */
322 if (unlikely(data->blocks > 1 && data->blksz & 15))
323 return -EINVAL;
324
325 sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_FROM_SG);
326
327 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
328 0, CB710_MMC_C2_READ_PIO_SIZE_MASK);
329
330 while (blocks-- > 0) {
331 len = (data->blksz + 15) >> 4;
332 do {
333 if (!(cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT)
334 & CB710_MMC_S2_FIFO_EMPTY)) {
335 err = cb710_wait_for_event(slot,
336 CB710_MMC_S1_PIO_TRANSFER_DONE);
337 if (err)
338 goto out;
339 }
340 cb710_sg_dwiter_read_to_io(&miter,
341 slot->iobase + CB710_MMC_DATA_PORT, 4);
342 } while (--len);
343 }
344 out:
345 sg_miter_stop(&miter);
346 return err;
347 }
348
349 static u16 cb710_encode_cmd_flags(struct cb710_mmc_reader *reader,
350 struct mmc_command *cmd)
351 {
352 unsigned int flags = cmd->flags;
353 u16 cb_flags = 0;
354
355 /* Windows driver returned 0 for commands for which no response
356 * is expected. It happened that there were only two such commands
357 * used: MMC_GO_IDLE_STATE and MMC_GO_INACTIVE_STATE so it might
358 * as well be a bug in that driver.
359 *
360 * Original driver set bit 14 for MMC/SD application
361 * commands. There's no difference 'on the wire' and
362 * it apparently works without it anyway.
363 */
364
365 switch (flags & MMC_CMD_MASK) {
366 case MMC_CMD_AC: cb_flags = CB710_MMC_CMD_AC; break;
367 case MMC_CMD_ADTC: cb_flags = CB710_MMC_CMD_ADTC; break;
368 case MMC_CMD_BC: cb_flags = CB710_MMC_CMD_BC; break;
369 case MMC_CMD_BCR: cb_flags = CB710_MMC_CMD_BCR; break;
370 }
371
372 if (flags & MMC_RSP_BUSY)
373 cb_flags |= CB710_MMC_RSP_BUSY;
374
375 cb_flags |= cmd->opcode << CB710_MMC_CMD_CODE_SHIFT;
376
377 if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
378 cb_flags |= CB710_MMC_DATA_READ;
379
380 if (flags & MMC_RSP_PRESENT) {
381 /* Windows driver set 01 at bits 4,3 except for
382 * MMC_SET_BLOCKLEN where it set 10. Maybe the
383 * hardware can do something special about this
384 * command? The original driver looks buggy/incomplete
385 * anyway so we ignore this for now.
386 *
387 * I assume that 00 here means no response is expected.
388 */
389 cb_flags |= CB710_MMC_RSP_PRESENT;
390
391 if (flags & MMC_RSP_136)
392 cb_flags |= CB710_MMC_RSP_136;
393 if (!(flags & MMC_RSP_CRC))
394 cb_flags |= CB710_MMC_RSP_NO_CRC;
395 }
396
397 return cb_flags;
398 }
399
400 static void cb710_receive_response(struct cb710_slot *slot,
401 struct mmc_command *cmd)
402 {
403 unsigned rsp_opcode, wanted_opcode;
404
405 /* Looks like final byte with CRC is always stripped (same as SDHCI) */
406 if (cmd->flags & MMC_RSP_136) {
407 u32 resp[4];
408
409 resp[0] = cb710_read_port_32(slot, CB710_MMC_RESPONSE3_PORT);
410 resp[1] = cb710_read_port_32(slot, CB710_MMC_RESPONSE2_PORT);
411 resp[2] = cb710_read_port_32(slot, CB710_MMC_RESPONSE1_PORT);
412 resp[3] = cb710_read_port_32(slot, CB710_MMC_RESPONSE0_PORT);
413 rsp_opcode = resp[0] >> 24;
414
415 cmd->resp[0] = (resp[0] << 8)|(resp[1] >> 24);
416 cmd->resp[1] = (resp[1] << 8)|(resp[2] >> 24);
417 cmd->resp[2] = (resp[2] << 8)|(resp[3] >> 24);
418 cmd->resp[3] = (resp[3] << 8);
419 } else {
420 rsp_opcode = cb710_read_port_32(slot, CB710_MMC_RESPONSE1_PORT) & 0x3F;
421 cmd->resp[0] = cb710_read_port_32(slot, CB710_MMC_RESPONSE0_PORT);
422 }
423
424 wanted_opcode = (cmd->flags & MMC_RSP_OPCODE) ? cmd->opcode : 0x3F;
425 if (rsp_opcode != wanted_opcode)
426 cmd->error = -EILSEQ;
427 }
428
429 static int cb710_mmc_transfer_data(struct cb710_slot *slot,
430 struct mmc_data *data)
431 {
432 int error, to;
433
434 if (data->flags & MMC_DATA_READ)
435 error = cb710_mmc_receive(slot, data);
436 else
437 error = cb710_mmc_send(slot, data);
438
439 to = cb710_wait_for_event(slot, CB710_MMC_S1_DATA_TRANSFER_DONE);
440 if (!error)
441 error = to;
442
443 if (!error)
444 data->bytes_xfered = data->blksz * data->blocks;
445 return error;
446 }
447
448 static int cb710_mmc_command(struct mmc_host *mmc, struct mmc_command *cmd)
449 {
450 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
451 struct cb710_mmc_reader *reader = mmc_priv(mmc);
452 struct mmc_data *data = cmd->data;
453
454 u16 cb_cmd = cb710_encode_cmd_flags(reader, cmd);
455 dev_dbg(cb710_slot_dev(slot), "cmd request: 0x%04X\n", cb_cmd);
456
457 if (data) {
458 if (!cb710_is_transfer_size_supported(data)) {
459 data->error = -EINVAL;
460 return -1;
461 }
462 cb710_mmc_set_transfer_size(slot, data->blocks, data->blksz);
463 }
464
465 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20|CB710_MMC_S2_BUSY_10);
466 cb710_write_port_16(slot, CB710_MMC_CMD_TYPE_PORT, cb_cmd);
467 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
468 cb710_write_port_32(slot, CB710_MMC_CMD_PARAM_PORT, cmd->arg);
469 cb710_mmc_reset_events(slot);
470 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
471 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x01, 0);
472
473 cmd->error = cb710_wait_for_event(slot, CB710_MMC_S1_COMMAND_SENT);
474 if (cmd->error)
475 return -1;
476
477 if (cmd->flags & MMC_RSP_PRESENT) {
478 cb710_receive_response(slot, cmd);
479 if (cmd->error)
480 return -1;
481 }
482
483 if (data)
484 data->error = cb710_mmc_transfer_data(slot, data);
485 return 0;
486 }
487
488 static void cb710_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
489 {
490 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
491 struct cb710_mmc_reader *reader = mmc_priv(mmc);
492
493 WARN_ON(reader->mrq != NULL);
494
495 reader->mrq = mrq;
496 cb710_mmc_enable_irq(slot, CB710_MMC_IE_TEST_MASK, 0);
497
498 if (cb710_mmc_is_card_inserted(slot)) {
499 if (!cb710_mmc_command(mmc, mrq->cmd) && mrq->stop)
500 cb710_mmc_command(mmc, mrq->stop);
501 mdelay(1);
502 } else {
503 mrq->cmd->error = -ENOMEDIUM;
504 }
505
506 tasklet_schedule(&reader->finish_req_tasklet);
507 }
508
509 static int cb710_mmc_powerup(struct cb710_slot *slot)
510 {
511 #ifdef CONFIG_CB710_DEBUG
512 struct cb710_chip *chip = cb710_slot_to_chip(slot);
513 #endif
514 int err;
515
516 /* a lot of magic; see comment in cb710_mmc_set_clock() */
517 dev_dbg(cb710_slot_dev(slot), "bus powerup\n");
518 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
519 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
520 if (unlikely(err))
521 return err;
522 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x80, 0);
523 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0x80, 0);
524 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
525 mdelay(1);
526 dev_dbg(cb710_slot_dev(slot), "after delay 1\n");
527 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
528 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
529 if (unlikely(err))
530 return err;
531 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x09, 0);
532 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
533 mdelay(1);
534 dev_dbg(cb710_slot_dev(slot), "after delay 2\n");
535 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
536 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
537 if (unlikely(err))
538 return err;
539 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0, 0x08);
540 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
541 mdelay(2);
542 dev_dbg(cb710_slot_dev(slot), "after delay 3\n");
543 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
544 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x06, 0);
545 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x70, 0);
546 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT, 0x80, 0);
547 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0x03, 0);
548 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
549 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
550 if (unlikely(err))
551 return err;
552 /* This port behaves weird: quick byte reads of 0x08,0x09 return
553 * 0xFF,0x00 after writing 0xFFFF to 0x08; it works correctly when
554 * read/written from userspace... What am I missing here?
555 * (it doesn't depend on write-to-read delay) */
556 cb710_write_port_16(slot, CB710_MMC_CONFIGB_PORT, 0xFFFF);
557 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x06, 0);
558 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
559 dev_dbg(cb710_slot_dev(slot), "bus powerup finished\n");
560
561 return cb710_check_event(slot, 0);
562 }
563
564 static void cb710_mmc_powerdown(struct cb710_slot *slot)
565 {
566 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0, 0x81);
567 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0, 0x80);
568 }
569
570 static void cb710_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
571 {
572 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
573 struct cb710_mmc_reader *reader = mmc_priv(mmc);
574 int err;
575
576 cb710_mmc_set_clock(mmc, ios->clock);
577
578 if (!cb710_mmc_is_card_inserted(slot)) {
579 dev_dbg(cb710_slot_dev(slot),
580 "no card inserted - ignoring bus powerup request\n");
581 ios->power_mode = MMC_POWER_OFF;
582 }
583
584 if (ios->power_mode != reader->last_power_mode)
585 switch (ios->power_mode) {
586 case MMC_POWER_ON:
587 err = cb710_mmc_powerup(slot);
588 if (err) {
589 dev_warn(cb710_slot_dev(slot),
590 "powerup failed (%d)- retrying\n", err);
591 cb710_mmc_powerdown(slot);
592 udelay(1);
593 err = cb710_mmc_powerup(slot);
594 if (err)
595 dev_warn(cb710_slot_dev(slot),
596 "powerup retry failed (%d) - expect errors\n",
597 err);
598 }
599 reader->last_power_mode = MMC_POWER_ON;
600 break;
601 case MMC_POWER_OFF:
602 cb710_mmc_powerdown(slot);
603 reader->last_power_mode = MMC_POWER_OFF;
604 break;
605 case MMC_POWER_UP:
606 default:
607 /* ignore */;
608 }
609
610 cb710_mmc_enable_4bit_data(slot, ios->bus_width != MMC_BUS_WIDTH_1);
611
612 cb710_mmc_enable_irq(slot, CB710_MMC_IE_TEST_MASK, 0);
613 }
614
615 static int cb710_mmc_get_ro(struct mmc_host *mmc)
616 {
617 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
618
619 return cb710_read_port_8(slot, CB710_MMC_STATUS3_PORT)
620 & CB710_MMC_S3_WRITE_PROTECTED;
621 }
622
623 static int cb710_mmc_irq_handler(struct cb710_slot *slot)
624 {
625 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
626 struct cb710_mmc_reader *reader = mmc_priv(mmc);
627 u32 status, config1, config2, irqen;
628
629 status = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
630 irqen = cb710_read_port_32(slot, CB710_MMC_IRQ_ENABLE_PORT);
631 config2 = cb710_read_port_32(slot, CB710_MMC_CONFIGB_PORT);
632 config1 = cb710_read_port_32(slot, CB710_MMC_CONFIG_PORT);
633
634 dev_dbg(cb710_slot_dev(slot), "interrupt; status: %08X, "
635 "ie: %08X, c2: %08X, c1: %08X\n",
636 status, irqen, config2, config1);
637
638 if (status & (CB710_MMC_S1_CARD_CHANGED << 8)) {
639 /* ack the event */
640 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT,
641 CB710_MMC_S1_CARD_CHANGED);
642 if ((irqen & CB710_MMC_IE_CISTATUS_MASK)
643 == CB710_MMC_IE_CISTATUS_MASK)
644 mmc_detect_change(mmc, HZ/5);
645 } else {
646 dev_dbg(cb710_slot_dev(slot), "unknown interrupt (test)\n");
647 spin_lock(&reader->irq_lock);
648 __cb710_mmc_enable_irq(slot, 0, CB710_MMC_IE_TEST_MASK);
649 spin_unlock(&reader->irq_lock);
650 }
651
652 return 1;
653 }
654
655 static void cb710_mmc_finish_request_tasklet(unsigned long data)
656 {
657 struct mmc_host *mmc = (void *)data;
658 struct cb710_mmc_reader *reader = mmc_priv(mmc);
659 struct mmc_request *mrq = reader->mrq;
660
661 reader->mrq = NULL;
662 mmc_request_done(mmc, mrq);
663 }
664
665 static const struct mmc_host_ops cb710_mmc_host = {
666 .request = cb710_mmc_request,
667 .set_ios = cb710_mmc_set_ios,
668 .get_ro = cb710_mmc_get_ro
669 };
670
671 #ifdef CONFIG_PM
672
673 static int cb710_mmc_suspend(struct platform_device *pdev, pm_message_t state)
674 {
675 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
676 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
677 int err;
678
679 err = mmc_suspend_host(mmc, state);
680 if (err)
681 return err;
682
683 cb710_mmc_enable_irq(slot, 0, ~0);
684 return 0;
685 }
686
687 static int cb710_mmc_resume(struct platform_device *pdev)
688 {
689 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
690 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
691
692 cb710_mmc_enable_irq(slot, 0, ~0);
693
694 return mmc_resume_host(mmc);
695 }
696
697 #endif /* CONFIG_PM */
698
699 static int __devinit cb710_mmc_init(struct platform_device *pdev)
700 {
701 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
702 struct cb710_chip *chip = cb710_slot_to_chip(slot);
703 struct mmc_host *mmc;
704 struct cb710_mmc_reader *reader;
705 int err;
706 u32 val;
707
708 mmc = mmc_alloc_host(sizeof(*reader), cb710_slot_dev(slot));
709 if (!mmc)
710 return -ENOMEM;
711
712 dev_set_drvdata(&pdev->dev, mmc);
713
714 /* harmless (maybe) magic */
715 pci_read_config_dword(chip->pdev, 0x48, &val);
716 val = cb710_src_freq_mhz[(val >> 16) & 0xF];
717 dev_dbg(cb710_slot_dev(slot), "source frequency: %dMHz\n", val);
718 val *= 1000000;
719
720 mmc->ops = &cb710_mmc_host;
721 mmc->f_max = val;
722 mmc->f_min = val >> cb710_clock_divider_log2[CB710_MAX_DIVIDER_IDX];
723 mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
724 mmc->caps = MMC_CAP_4_BIT_DATA;
725
726 reader = mmc_priv(mmc);
727
728 tasklet_init(&reader->finish_req_tasklet,
729 cb710_mmc_finish_request_tasklet, (unsigned long)mmc);
730 spin_lock_init(&reader->irq_lock);
731 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
732
733 cb710_mmc_enable_irq(slot, 0, ~0);
734 cb710_set_irq_handler(slot, cb710_mmc_irq_handler);
735
736 err = mmc_add_host(mmc);
737 if (unlikely(err))
738 goto err_free_mmc;
739
740 dev_dbg(cb710_slot_dev(slot), "mmc_hostname is %s\n",
741 mmc_hostname(mmc));
742
743 cb710_mmc_enable_irq(slot, CB710_MMC_IE_CARD_INSERTION_STATUS, 0);
744
745 return 0;
746
747 err_free_mmc:
748 dev_dbg(cb710_slot_dev(slot), "mmc_add_host() failed: %d\n", err);
749
750 mmc_free_host(mmc);
751 return err;
752 }
753
754 static int __devexit cb710_mmc_exit(struct platform_device *pdev)
755 {
756 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
757 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
758 struct cb710_mmc_reader *reader = mmc_priv(mmc);
759
760 cb710_mmc_enable_irq(slot, 0, CB710_MMC_IE_CARD_INSERTION_STATUS);
761
762 mmc_remove_host(mmc);
763
764 /* IRQs should be disabled now, but let's stay on the safe side */
765 cb710_mmc_enable_irq(slot, 0, ~0);
766 cb710_set_irq_handler(slot, NULL);
767
768 /* clear config ports - just in case */
769 cb710_write_port_32(slot, CB710_MMC_CONFIG_PORT, 0);
770 cb710_write_port_16(slot, CB710_MMC_CONFIGB_PORT, 0);
771
772 tasklet_kill(&reader->finish_req_tasklet);
773
774 mmc_free_host(mmc);
775 return 0;
776 }
777
778 static struct platform_driver cb710_mmc_driver = {
779 .driver.name = "cb710-mmc",
780 .probe = cb710_mmc_init,
781 .remove = __devexit_p(cb710_mmc_exit),
782 #ifdef CONFIG_PM
783 .suspend = cb710_mmc_suspend,
784 .resume = cb710_mmc_resume,
785 #endif
786 };
787
788 static int __init cb710_mmc_init_module(void)
789 {
790 return platform_driver_register(&cb710_mmc_driver);
791 }
792
793 static void __exit cb710_mmc_cleanup_module(void)
794 {
795 platform_driver_unregister(&cb710_mmc_driver);
796 }
797
798 module_init(cb710_mmc_init_module);
799 module_exit(cb710_mmc_cleanup_module);
800
801 MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
802 MODULE_DESCRIPTION("ENE CB710 memory card reader driver - MMC/SD part");
803 MODULE_LICENSE("GPL");
804 MODULE_ALIAS("platform:cb710-mmc");
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