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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * cb710/mmc.c
4 *
5 * Copyright by Michał Mirosław, 2008-2009
6 */
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/pci.h>
10#include <linux/delay.h>
11#include "cb710-mmc.h"
12
13#define CB710_MMC_REQ_TIMEOUT_MS 2000
14
15static const u8 cb710_clock_divider_log2[8] = {
16/* 1, 2, 4, 8, 16, 32, 128, 512 */
17 0, 1, 2, 3, 4, 5, 7, 9
18};
19#define CB710_MAX_DIVIDER_IDX \
20 (ARRAY_SIZE(cb710_clock_divider_log2) - 1)
21
22static const u8 cb710_src_freq_mhz[16] = {
23 33, 10, 20, 25, 30, 35, 40, 45,
24 50, 55, 60, 65, 70, 75, 80, 85
25};
26
27static void cb710_mmc_select_clock_divider(struct mmc_host *mmc, int hz)
28{
29 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
30 struct pci_dev *pdev = cb710_slot_to_chip(slot)->pdev;
31 u32 src_freq_idx;
32 u32 divider_idx;
33 int src_hz;
34
35 /* on CB710 in HP nx9500:
36 * src_freq_idx == 0
37 * indexes 1-7 work as written in the table
38 * indexes 0,8-15 give no clock output
39 */
40 pci_read_config_dword(pdev, 0x48, &src_freq_idx);
41 src_freq_idx = (src_freq_idx >> 16) & 0xF;
42 src_hz = cb710_src_freq_mhz[src_freq_idx] * 1000000;
43
44 for (divider_idx = 0; divider_idx < CB710_MAX_DIVIDER_IDX; ++divider_idx) {
45 if (hz >= src_hz >> cb710_clock_divider_log2[divider_idx])
46 break;
47 }
48
49 if (src_freq_idx)
50 divider_idx |= 0x8;
51 else if (divider_idx == 0)
52 divider_idx = 1;
53
54 cb710_pci_update_config_reg(pdev, 0x40, ~0xF0000000, divider_idx << 28);
55
56 dev_dbg(cb710_slot_dev(slot),
57 "clock set to %d Hz, wanted %d Hz; src_freq_idx = %d, divider_idx = %d|%d\n",
58 src_hz >> cb710_clock_divider_log2[divider_idx & 7],
59 hz, src_freq_idx, divider_idx & 7, divider_idx & 8);
60}
61
62static void __cb710_mmc_enable_irq(struct cb710_slot *slot,
63 unsigned short enable, unsigned short mask)
64{
65 /* clear global IE
66 * - it gets set later if any interrupt sources are enabled */
67 mask |= CB710_MMC_IE_IRQ_ENABLE;
68
69 /* look like interrupt is fired whenever
70 * WORD[0x0C] & WORD[0x10] != 0;
71 * -> bit 15 port 0x0C seems to be global interrupt enable
72 */
73
74 enable = (cb710_read_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT)
75 & ~mask) | enable;
76
77 if (enable)
78 enable |= CB710_MMC_IE_IRQ_ENABLE;
79
80 cb710_write_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT, enable);
81}
82
83static void cb710_mmc_enable_irq(struct cb710_slot *slot,
84 unsigned short enable, unsigned short mask)
85{
86 struct cb710_mmc_reader *reader = mmc_priv(cb710_slot_to_mmc(slot));
87 unsigned long flags;
88
89 spin_lock_irqsave(&reader->irq_lock, flags);
90 /* this is the only thing irq_lock protects */
91 __cb710_mmc_enable_irq(slot, enable, mask);
92 spin_unlock_irqrestore(&reader->irq_lock, flags);
93}
94
95static void cb710_mmc_reset_events(struct cb710_slot *slot)
96{
97 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT, 0xFF);
98 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT, 0xFF);
99 cb710_write_port_8(slot, CB710_MMC_STATUS2_PORT, 0xFF);
100}
101
102static void cb710_mmc_enable_4bit_data(struct cb710_slot *slot, int enable)
103{
104 if (enable)
105 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT,
106 CB710_MMC_C1_4BIT_DATA_BUS, 0);
107 else
108 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT,
109 0, CB710_MMC_C1_4BIT_DATA_BUS);
110}
111
112static int cb710_check_event(struct cb710_slot *slot, u8 what)
113{
114 u16 status;
115
116 status = cb710_read_port_16(slot, CB710_MMC_STATUS_PORT);
117
118 if (status & CB710_MMC_S0_FIFO_UNDERFLOW) {
119 /* it is just a guess, so log it */
120 dev_dbg(cb710_slot_dev(slot),
121 "CHECK : ignoring bit 6 in status %04X\n", status);
122 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT,
123 CB710_MMC_S0_FIFO_UNDERFLOW);
124 status &= ~CB710_MMC_S0_FIFO_UNDERFLOW;
125 }
126
127 if (status & CB710_MMC_STATUS_ERROR_EVENTS) {
128 dev_dbg(cb710_slot_dev(slot),
129 "CHECK : returning EIO on status %04X\n", status);
130 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT, status & 0xFF);
131 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT,
132 CB710_MMC_S1_RESET);
133 return -EIO;
134 }
135
136 /* 'what' is a bit in MMC_STATUS1 */
137 if ((status >> 8) & what) {
138 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT, what);
139 return 1;
140 }
141
142 return 0;
143}
144
145static int cb710_wait_for_event(struct cb710_slot *slot, u8 what)
146{
147 int err = 0;
148 unsigned limit = 2000000; /* FIXME: real timeout */
149
150#ifdef CONFIG_CB710_DEBUG
151 u32 e, x;
152 e = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
153#endif
154
155 while (!(err = cb710_check_event(slot, what))) {
156 if (!--limit) {
157 cb710_dump_regs(cb710_slot_to_chip(slot),
158 CB710_DUMP_REGS_MMC);
159 err = -ETIMEDOUT;
160 break;
161 }
162 udelay(1);
163 }
164
165#ifdef CONFIG_CB710_DEBUG
166 x = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
167
168 limit = 2000000 - limit;
169 if (limit > 100)
170 dev_dbg(cb710_slot_dev(slot),
171 "WAIT10: waited %d loops, what %d, entry val %08X, exit val %08X\n",
172 limit, what, e, x);
173#endif
174 return err < 0 ? err : 0;
175}
176
177
178static int cb710_wait_while_busy(struct cb710_slot *slot, uint8_t mask)
179{
180 unsigned limit = 500000; /* FIXME: real timeout */
181 int err = 0;
182
183#ifdef CONFIG_CB710_DEBUG
184 u32 e, x;
185 e = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
186#endif
187
188 while (cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT) & mask) {
189 if (!--limit) {
190 cb710_dump_regs(cb710_slot_to_chip(slot),
191 CB710_DUMP_REGS_MMC);
192 err = -ETIMEDOUT;
193 break;
194 }
195 udelay(1);
196 }
197
198#ifdef CONFIG_CB710_DEBUG
199 x = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
200
201 limit = 500000 - limit;
202 if (limit > 100)
203 dev_dbg(cb710_slot_dev(slot),
204 "WAIT12: waited %d loops, mask %02X, entry val %08X, exit val %08X\n",
205 limit, mask, e, x);
206#endif
207 return err;
208}
209
210static void cb710_mmc_set_transfer_size(struct cb710_slot *slot,
211 size_t count, size_t blocksize)
212{
213 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
214 cb710_write_port_32(slot, CB710_MMC_TRANSFER_SIZE_PORT,
215 ((count - 1) << 16)|(blocksize - 1));
216
217 dev_vdbg(cb710_slot_dev(slot), "set up for %zu block%s of %zu bytes\n",
218 count, count == 1 ? "" : "s", blocksize);
219}
220
221static void cb710_mmc_fifo_hack(struct cb710_slot *slot)
222{
223 /* without this, received data is prepended with 8-bytes of zeroes */
224 u32 r1, r2;
225 int ok = 0;
226
227 r1 = cb710_read_port_32(slot, CB710_MMC_DATA_PORT);
228 r2 = cb710_read_port_32(slot, CB710_MMC_DATA_PORT);
229 if (cb710_read_port_8(slot, CB710_MMC_STATUS0_PORT)
230 & CB710_MMC_S0_FIFO_UNDERFLOW) {
231 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT,
232 CB710_MMC_S0_FIFO_UNDERFLOW);
233 ok = 1;
234 }
235
236 dev_dbg(cb710_slot_dev(slot),
237 "FIFO-read-hack: expected STATUS0 bit was %s\n",
238 ok ? "set." : "NOT SET!");
239 dev_dbg(cb710_slot_dev(slot),
240 "FIFO-read-hack: dwords ignored: %08X %08X - %s\n",
241 r1, r2, (r1|r2) ? "BAD (NOT ZERO)!" : "ok");
242}
243
244static int cb710_mmc_receive_pio(struct cb710_slot *slot,
245 struct sg_mapping_iter *miter, size_t dw_count)
246{
247 if (!(cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT) & CB710_MMC_S2_FIFO_READY)) {
248 int err = cb710_wait_for_event(slot,
249 CB710_MMC_S1_PIO_TRANSFER_DONE);
250 if (err)
251 return err;
252 }
253
254 cb710_sg_dwiter_write_from_io(miter,
255 slot->iobase + CB710_MMC_DATA_PORT, dw_count);
256
257 return 0;
258}
259
260static bool cb710_is_transfer_size_supported(struct mmc_data *data)
261{
262 return !(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8));
263}
264
265static int cb710_mmc_receive(struct cb710_slot *slot, struct mmc_data *data)
266{
267 struct sg_mapping_iter miter;
268 size_t len, blocks = data->blocks;
269 int err = 0;
270
271 /* TODO: I don't know how/if the hardware handles non-16B-boundary blocks
272 * except single 8B block */
273 if (unlikely(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8)))
274 return -EINVAL;
275
276 sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_TO_SG);
277
278 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
279 15, CB710_MMC_C2_READ_PIO_SIZE_MASK);
280
281 cb710_mmc_fifo_hack(slot);
282
283 while (blocks-- > 0) {
284 len = data->blksz;
285
286 while (len >= 16) {
287 err = cb710_mmc_receive_pio(slot, &miter, 4);
288 if (err)
289 goto out;
290 len -= 16;
291 }
292
293 if (!len)
294 continue;
295
296 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
297 len - 1, CB710_MMC_C2_READ_PIO_SIZE_MASK);
298
299 len = (len >= 8) ? 4 : 2;
300 err = cb710_mmc_receive_pio(slot, &miter, len);
301 if (err)
302 goto out;
303 }
304out:
305 sg_miter_stop(&miter);
306 return err;
307}
308
309static int cb710_mmc_send(struct cb710_slot *slot, struct mmc_data *data)
310{
311 struct sg_mapping_iter miter;
312 size_t len, blocks = data->blocks;
313 int err = 0;
314
315 /* TODO: I don't know how/if the hardware handles multiple
316 * non-16B-boundary blocks */
317 if (unlikely(data->blocks > 1 && data->blksz & 15))
318 return -EINVAL;
319
320 sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_FROM_SG);
321
322 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
323 0, CB710_MMC_C2_READ_PIO_SIZE_MASK);
324
325 while (blocks-- > 0) {
326 len = (data->blksz + 15) >> 4;
327 do {
328 if (!(cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT)
329 & CB710_MMC_S2_FIFO_EMPTY)) {
330 err = cb710_wait_for_event(slot,
331 CB710_MMC_S1_PIO_TRANSFER_DONE);
332 if (err)
333 goto out;
334 }
335 cb710_sg_dwiter_read_to_io(&miter,
336 slot->iobase + CB710_MMC_DATA_PORT, 4);
337 } while (--len);
338 }
339out:
340 sg_miter_stop(&miter);
341 return err;
342}
343
344static u16 cb710_encode_cmd_flags(struct cb710_mmc_reader *reader,
345 struct mmc_command *cmd)
346{
347 unsigned int flags = cmd->flags;
348 u16 cb_flags = 0;
349
350 /* Windows driver returned 0 for commands for which no response
351 * is expected. It happened that there were only two such commands
352 * used: MMC_GO_IDLE_STATE and MMC_GO_INACTIVE_STATE so it might
353 * as well be a bug in that driver.
354 *
355 * Original driver set bit 14 for MMC/SD application
356 * commands. There's no difference 'on the wire' and
357 * it apparently works without it anyway.
358 */
359
360 switch (flags & MMC_CMD_MASK) {
361 case MMC_CMD_AC: cb_flags = CB710_MMC_CMD_AC; break;
362 case MMC_CMD_ADTC: cb_flags = CB710_MMC_CMD_ADTC; break;
363 case MMC_CMD_BC: cb_flags = CB710_MMC_CMD_BC; break;
364 case MMC_CMD_BCR: cb_flags = CB710_MMC_CMD_BCR; break;
365 }
366
367 if (flags & MMC_RSP_BUSY)
368 cb_flags |= CB710_MMC_RSP_BUSY;
369
370 cb_flags |= cmd->opcode << CB710_MMC_CMD_CODE_SHIFT;
371
372 if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
373 cb_flags |= CB710_MMC_DATA_READ;
374
375 if (flags & MMC_RSP_PRESENT) {
376 /* Windows driver set 01 at bits 4,3 except for
377 * MMC_SET_BLOCKLEN where it set 10. Maybe the
378 * hardware can do something special about this
379 * command? The original driver looks buggy/incomplete
380 * anyway so we ignore this for now.
381 *
382 * I assume that 00 here means no response is expected.
383 */
384 cb_flags |= CB710_MMC_RSP_PRESENT;
385
386 if (flags & MMC_RSP_136)
387 cb_flags |= CB710_MMC_RSP_136;
388 if (!(flags & MMC_RSP_CRC))
389 cb_flags |= CB710_MMC_RSP_NO_CRC;
390 }
391
392 return cb_flags;
393}
394
395static void cb710_receive_response(struct cb710_slot *slot,
396 struct mmc_command *cmd)
397{
398 unsigned rsp_opcode, wanted_opcode;
399
400 /* Looks like final byte with CRC is always stripped (same as SDHCI) */
401 if (cmd->flags & MMC_RSP_136) {
402 u32 resp[4];
403
404 resp[0] = cb710_read_port_32(slot, CB710_MMC_RESPONSE3_PORT);
405 resp[1] = cb710_read_port_32(slot, CB710_MMC_RESPONSE2_PORT);
406 resp[2] = cb710_read_port_32(slot, CB710_MMC_RESPONSE1_PORT);
407 resp[3] = cb710_read_port_32(slot, CB710_MMC_RESPONSE0_PORT);
408 rsp_opcode = resp[0] >> 24;
409
410 cmd->resp[0] = (resp[0] << 8)|(resp[1] >> 24);
411 cmd->resp[1] = (resp[1] << 8)|(resp[2] >> 24);
412 cmd->resp[2] = (resp[2] << 8)|(resp[3] >> 24);
413 cmd->resp[3] = (resp[3] << 8);
414 } else {
415 rsp_opcode = cb710_read_port_32(slot, CB710_MMC_RESPONSE1_PORT) & 0x3F;
416 cmd->resp[0] = cb710_read_port_32(slot, CB710_MMC_RESPONSE0_PORT);
417 }
418
419 wanted_opcode = (cmd->flags & MMC_RSP_OPCODE) ? cmd->opcode : 0x3F;
420 if (rsp_opcode != wanted_opcode)
421 cmd->error = -EILSEQ;
422}
423
424static int cb710_mmc_transfer_data(struct cb710_slot *slot,
425 struct mmc_data *data)
426{
427 int error, to;
428
429 if (data->flags & MMC_DATA_READ)
430 error = cb710_mmc_receive(slot, data);
431 else
432 error = cb710_mmc_send(slot, data);
433
434 to = cb710_wait_for_event(slot, CB710_MMC_S1_DATA_TRANSFER_DONE);
435 if (!error)
436 error = to;
437
438 if (!error)
439 data->bytes_xfered = data->blksz * data->blocks;
440 return error;
441}
442
443static int cb710_mmc_command(struct mmc_host *mmc, struct mmc_command *cmd)
444{
445 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
446 struct cb710_mmc_reader *reader = mmc_priv(mmc);
447 struct mmc_data *data = cmd->data;
448
449 u16 cb_cmd = cb710_encode_cmd_flags(reader, cmd);
450 dev_dbg(cb710_slot_dev(slot), "cmd request: 0x%04X\n", cb_cmd);
451
452 if (data) {
453 if (!cb710_is_transfer_size_supported(data)) {
454 data->error = -EINVAL;
455 return -1;
456 }
457 cb710_mmc_set_transfer_size(slot, data->blocks, data->blksz);
458 }
459
460 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20|CB710_MMC_S2_BUSY_10);
461 cb710_write_port_16(slot, CB710_MMC_CMD_TYPE_PORT, cb_cmd);
462 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
463 cb710_write_port_32(slot, CB710_MMC_CMD_PARAM_PORT, cmd->arg);
464 cb710_mmc_reset_events(slot);
465 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
466 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x01, 0);
467
468 cmd->error = cb710_wait_for_event(slot, CB710_MMC_S1_COMMAND_SENT);
469 if (cmd->error)
470 return -1;
471
472 if (cmd->flags & MMC_RSP_PRESENT) {
473 cb710_receive_response(slot, cmd);
474 if (cmd->error)
475 return -1;
476 }
477
478 if (data)
479 data->error = cb710_mmc_transfer_data(slot, data);
480 return 0;
481}
482
483static void cb710_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
484{
485 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
486 struct cb710_mmc_reader *reader = mmc_priv(mmc);
487
488 WARN_ON(reader->mrq != NULL);
489
490 reader->mrq = mrq;
491 cb710_mmc_enable_irq(slot, CB710_MMC_IE_TEST_MASK, 0);
492
493 if (!cb710_mmc_command(mmc, mrq->cmd) && mrq->stop)
494 cb710_mmc_command(mmc, mrq->stop);
495
496 tasklet_schedule(&reader->finish_req_tasklet);
497}
498
499static int cb710_mmc_powerup(struct cb710_slot *slot)
500{
501#ifdef CONFIG_CB710_DEBUG
502 struct cb710_chip *chip = cb710_slot_to_chip(slot);
503#endif
504 int err;
505
506 /* a lot of magic for now */
507 dev_dbg(cb710_slot_dev(slot), "bus powerup\n");
508 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
509 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
510 if (unlikely(err))
511 return err;
512 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x80, 0);
513 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0x80, 0);
514 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
515 mdelay(1);
516 dev_dbg(cb710_slot_dev(slot), "after delay 1\n");
517 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
518 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
519 if (unlikely(err))
520 return err;
521 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x09, 0);
522 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
523 mdelay(1);
524 dev_dbg(cb710_slot_dev(slot), "after delay 2\n");
525 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
526 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
527 if (unlikely(err))
528 return err;
529 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0, 0x08);
530 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
531 mdelay(2);
532 dev_dbg(cb710_slot_dev(slot), "after delay 3\n");
533 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
534 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x06, 0);
535 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x70, 0);
536 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT, 0x80, 0);
537 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0x03, 0);
538 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
539 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
540 if (unlikely(err))
541 return err;
542 /* This port behaves weird: quick byte reads of 0x08,0x09 return
543 * 0xFF,0x00 after writing 0xFFFF to 0x08; it works correctly when
544 * read/written from userspace... What am I missing here?
545 * (it doesn't depend on write-to-read delay) */
546 cb710_write_port_16(slot, CB710_MMC_CONFIGB_PORT, 0xFFFF);
547 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x06, 0);
548 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
549 dev_dbg(cb710_slot_dev(slot), "bus powerup finished\n");
550
551 return cb710_check_event(slot, 0);
552}
553
554static void cb710_mmc_powerdown(struct cb710_slot *slot)
555{
556 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0, 0x81);
557 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0, 0x80);
558}
559
560static void cb710_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
561{
562 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
563 struct cb710_mmc_reader *reader = mmc_priv(mmc);
564 int err;
565
566 cb710_mmc_select_clock_divider(mmc, ios->clock);
567
568 if (ios->power_mode != reader->last_power_mode) {
569 switch (ios->power_mode) {
570 case MMC_POWER_ON:
571 err = cb710_mmc_powerup(slot);
572 if (err) {
573 dev_warn(cb710_slot_dev(slot),
574 "powerup failed (%d)- retrying\n", err);
575 cb710_mmc_powerdown(slot);
576 udelay(1);
577 err = cb710_mmc_powerup(slot);
578 if (err)
579 dev_warn(cb710_slot_dev(slot),
580 "powerup retry failed (%d) - expect errors\n",
581 err);
582 }
583 reader->last_power_mode = MMC_POWER_ON;
584 break;
585 case MMC_POWER_OFF:
586 cb710_mmc_powerdown(slot);
587 reader->last_power_mode = MMC_POWER_OFF;
588 break;
589 case MMC_POWER_UP:
590 default:
591 /* ignore */
592 break;
593 }
594 }
595
596 cb710_mmc_enable_4bit_data(slot, ios->bus_width != MMC_BUS_WIDTH_1);
597
598 cb710_mmc_enable_irq(slot, CB710_MMC_IE_TEST_MASK, 0);
599}
600
601static int cb710_mmc_get_ro(struct mmc_host *mmc)
602{
603 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
604
605 return cb710_read_port_8(slot, CB710_MMC_STATUS3_PORT)
606 & CB710_MMC_S3_WRITE_PROTECTED;
607}
608
609static int cb710_mmc_get_cd(struct mmc_host *mmc)
610{
611 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
612
613 return cb710_read_port_8(slot, CB710_MMC_STATUS3_PORT)
614 & CB710_MMC_S3_CARD_DETECTED;
615}
616
617static int cb710_mmc_irq_handler(struct cb710_slot *slot)
618{
619 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
620 struct cb710_mmc_reader *reader = mmc_priv(mmc);
621 u32 status, config1, config2, irqen;
622
623 status = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
624 irqen = cb710_read_port_32(slot, CB710_MMC_IRQ_ENABLE_PORT);
625 config2 = cb710_read_port_32(slot, CB710_MMC_CONFIGB_PORT);
626 config1 = cb710_read_port_32(slot, CB710_MMC_CONFIG_PORT);
627
628 dev_dbg(cb710_slot_dev(slot), "interrupt; status: %08X, "
629 "ie: %08X, c2: %08X, c1: %08X\n",
630 status, irqen, config2, config1);
631
632 if (status & (CB710_MMC_S1_CARD_CHANGED << 8)) {
633 /* ack the event */
634 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT,
635 CB710_MMC_S1_CARD_CHANGED);
636 if ((irqen & CB710_MMC_IE_CISTATUS_MASK)
637 == CB710_MMC_IE_CISTATUS_MASK)
638 mmc_detect_change(mmc, HZ/5);
639 } else {
640 dev_dbg(cb710_slot_dev(slot), "unknown interrupt (test)\n");
641 spin_lock(&reader->irq_lock);
642 __cb710_mmc_enable_irq(slot, 0, CB710_MMC_IE_TEST_MASK);
643 spin_unlock(&reader->irq_lock);
644 }
645
646 return 1;
647}
648
649static void cb710_mmc_finish_request_tasklet(struct tasklet_struct *t)
650{
651 struct cb710_mmc_reader *reader = from_tasklet(reader, t,
652 finish_req_tasklet);
653 struct mmc_request *mrq = reader->mrq;
654
655 reader->mrq = NULL;
656 mmc_request_done(mmc_from_priv(reader), mrq);
657}
658
659static const struct mmc_host_ops cb710_mmc_host = {
660 .request = cb710_mmc_request,
661 .set_ios = cb710_mmc_set_ios,
662 .get_ro = cb710_mmc_get_ro,
663 .get_cd = cb710_mmc_get_cd,
664};
665
666#ifdef CONFIG_PM
667
668static int cb710_mmc_suspend(struct platform_device *pdev, pm_message_t state)
669{
670 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
671
672 cb710_mmc_enable_irq(slot, 0, ~0);
673 return 0;
674}
675
676static int cb710_mmc_resume(struct platform_device *pdev)
677{
678 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
679
680 cb710_mmc_enable_irq(slot, 0, ~0);
681 return 0;
682}
683
684#endif /* CONFIG_PM */
685
686static int cb710_mmc_init(struct platform_device *pdev)
687{
688 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
689 struct cb710_chip *chip = cb710_slot_to_chip(slot);
690 struct mmc_host *mmc;
691 struct cb710_mmc_reader *reader;
692 int err;
693 u32 val;
694
695 mmc = mmc_alloc_host(sizeof(*reader), cb710_slot_dev(slot));
696 if (!mmc)
697 return -ENOMEM;
698
699 platform_set_drvdata(pdev, mmc);
700
701 /* harmless (maybe) magic */
702 pci_read_config_dword(chip->pdev, 0x48, &val);
703 val = cb710_src_freq_mhz[(val >> 16) & 0xF];
704 dev_dbg(cb710_slot_dev(slot), "source frequency: %dMHz\n", val);
705 val *= 1000000;
706
707 mmc->ops = &cb710_mmc_host;
708 mmc->f_max = val;
709 mmc->f_min = val >> cb710_clock_divider_log2[CB710_MAX_DIVIDER_IDX];
710 mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
711 mmc->caps = MMC_CAP_4_BIT_DATA;
712 /*
713 * In cb710_wait_for_event() we use a fixed timeout of ~2s, hence let's
714 * inform the core about it. A future improvement should instead make
715 * use of the cmd->busy_timeout.
716 */
717 mmc->max_busy_timeout = CB710_MMC_REQ_TIMEOUT_MS;
718
719 reader = mmc_priv(mmc);
720
721 tasklet_setup(&reader->finish_req_tasklet,
722 cb710_mmc_finish_request_tasklet);
723 spin_lock_init(&reader->irq_lock);
724 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
725
726 cb710_mmc_enable_irq(slot, 0, ~0);
727 cb710_set_irq_handler(slot, cb710_mmc_irq_handler);
728
729 err = mmc_add_host(mmc);
730 if (unlikely(err))
731 goto err_free_mmc;
732
733 dev_dbg(cb710_slot_dev(slot), "mmc_hostname is %s\n",
734 mmc_hostname(mmc));
735
736 cb710_mmc_enable_irq(slot, CB710_MMC_IE_CARD_INSERTION_STATUS, 0);
737
738 return 0;
739
740err_free_mmc:
741 dev_dbg(cb710_slot_dev(slot), "mmc_add_host() failed: %d\n", err);
742
743 cb710_set_irq_handler(slot, NULL);
744 mmc_free_host(mmc);
745 return err;
746}
747
748static int cb710_mmc_exit(struct platform_device *pdev)
749{
750 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
751 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
752 struct cb710_mmc_reader *reader = mmc_priv(mmc);
753
754 cb710_mmc_enable_irq(slot, 0, CB710_MMC_IE_CARD_INSERTION_STATUS);
755
756 mmc_remove_host(mmc);
757
758 /* IRQs should be disabled now, but let's stay on the safe side */
759 cb710_mmc_enable_irq(slot, 0, ~0);
760 cb710_set_irq_handler(slot, NULL);
761
762 /* clear config ports - just in case */
763 cb710_write_port_32(slot, CB710_MMC_CONFIG_PORT, 0);
764 cb710_write_port_16(slot, CB710_MMC_CONFIGB_PORT, 0);
765
766 tasklet_kill(&reader->finish_req_tasklet);
767
768 mmc_free_host(mmc);
769 return 0;
770}
771
772static struct platform_driver cb710_mmc_driver = {
773 .driver.name = "cb710-mmc",
774 .probe = cb710_mmc_init,
775 .remove = cb710_mmc_exit,
776#ifdef CONFIG_PM
777 .suspend = cb710_mmc_suspend,
778 .resume = cb710_mmc_resume,
779#endif
780};
781
782module_platform_driver(cb710_mmc_driver);
783
784MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
785MODULE_DESCRIPTION("ENE CB710 memory card reader driver - MMC/SD part");
786MODULE_LICENSE("GPL");
787MODULE_ALIAS("platform:cb710-mmc");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * cb710/mmc.c
4 *
5 * Copyright by Michał Mirosław, 2008-2009
6 */
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/pci.h>
10#include <linux/delay.h>
11#include "cb710-mmc.h"
12
13static const u8 cb710_clock_divider_log2[8] = {
14/* 1, 2, 4, 8, 16, 32, 128, 512 */
15 0, 1, 2, 3, 4, 5, 7, 9
16};
17#define CB710_MAX_DIVIDER_IDX \
18 (ARRAY_SIZE(cb710_clock_divider_log2) - 1)
19
20static const u8 cb710_src_freq_mhz[16] = {
21 33, 10, 20, 25, 30, 35, 40, 45,
22 50, 55, 60, 65, 70, 75, 80, 85
23};
24
25static void cb710_mmc_select_clock_divider(struct mmc_host *mmc, int hz)
26{
27 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
28 struct pci_dev *pdev = cb710_slot_to_chip(slot)->pdev;
29 u32 src_freq_idx;
30 u32 divider_idx;
31 int src_hz;
32
33 /* on CB710 in HP nx9500:
34 * src_freq_idx == 0
35 * indexes 1-7 work as written in the table
36 * indexes 0,8-15 give no clock output
37 */
38 pci_read_config_dword(pdev, 0x48, &src_freq_idx);
39 src_freq_idx = (src_freq_idx >> 16) & 0xF;
40 src_hz = cb710_src_freq_mhz[src_freq_idx] * 1000000;
41
42 for (divider_idx = 0; divider_idx < CB710_MAX_DIVIDER_IDX; ++divider_idx) {
43 if (hz >= src_hz >> cb710_clock_divider_log2[divider_idx])
44 break;
45 }
46
47 if (src_freq_idx)
48 divider_idx |= 0x8;
49 else if (divider_idx == 0)
50 divider_idx = 1;
51
52 cb710_pci_update_config_reg(pdev, 0x40, ~0xF0000000, divider_idx << 28);
53
54 dev_dbg(cb710_slot_dev(slot),
55 "clock set to %d Hz, wanted %d Hz; src_freq_idx = %d, divider_idx = %d|%d\n",
56 src_hz >> cb710_clock_divider_log2[divider_idx & 7],
57 hz, src_freq_idx, divider_idx & 7, divider_idx & 8);
58}
59
60static void __cb710_mmc_enable_irq(struct cb710_slot *slot,
61 unsigned short enable, unsigned short mask)
62{
63 /* clear global IE
64 * - it gets set later if any interrupt sources are enabled */
65 mask |= CB710_MMC_IE_IRQ_ENABLE;
66
67 /* look like interrupt is fired whenever
68 * WORD[0x0C] & WORD[0x10] != 0;
69 * -> bit 15 port 0x0C seems to be global interrupt enable
70 */
71
72 enable = (cb710_read_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT)
73 & ~mask) | enable;
74
75 if (enable)
76 enable |= CB710_MMC_IE_IRQ_ENABLE;
77
78 cb710_write_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT, enable);
79}
80
81static void cb710_mmc_enable_irq(struct cb710_slot *slot,
82 unsigned short enable, unsigned short mask)
83{
84 struct cb710_mmc_reader *reader = mmc_priv(cb710_slot_to_mmc(slot));
85 unsigned long flags;
86
87 spin_lock_irqsave(&reader->irq_lock, flags);
88 /* this is the only thing irq_lock protects */
89 __cb710_mmc_enable_irq(slot, enable, mask);
90 spin_unlock_irqrestore(&reader->irq_lock, flags);
91}
92
93static void cb710_mmc_reset_events(struct cb710_slot *slot)
94{
95 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT, 0xFF);
96 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT, 0xFF);
97 cb710_write_port_8(slot, CB710_MMC_STATUS2_PORT, 0xFF);
98}
99
100static void cb710_mmc_enable_4bit_data(struct cb710_slot *slot, int enable)
101{
102 if (enable)
103 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT,
104 CB710_MMC_C1_4BIT_DATA_BUS, 0);
105 else
106 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT,
107 0, CB710_MMC_C1_4BIT_DATA_BUS);
108}
109
110static int cb710_check_event(struct cb710_slot *slot, u8 what)
111{
112 u16 status;
113
114 status = cb710_read_port_16(slot, CB710_MMC_STATUS_PORT);
115
116 if (status & CB710_MMC_S0_FIFO_UNDERFLOW) {
117 /* it is just a guess, so log it */
118 dev_dbg(cb710_slot_dev(slot),
119 "CHECK : ignoring bit 6 in status %04X\n", status);
120 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT,
121 CB710_MMC_S0_FIFO_UNDERFLOW);
122 status &= ~CB710_MMC_S0_FIFO_UNDERFLOW;
123 }
124
125 if (status & CB710_MMC_STATUS_ERROR_EVENTS) {
126 dev_dbg(cb710_slot_dev(slot),
127 "CHECK : returning EIO on status %04X\n", status);
128 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT, status & 0xFF);
129 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT,
130 CB710_MMC_S1_RESET);
131 return -EIO;
132 }
133
134 /* 'what' is a bit in MMC_STATUS1 */
135 if ((status >> 8) & what) {
136 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT, what);
137 return 1;
138 }
139
140 return 0;
141}
142
143static int cb710_wait_for_event(struct cb710_slot *slot, u8 what)
144{
145 int err = 0;
146 unsigned limit = 2000000; /* FIXME: real timeout */
147
148#ifdef CONFIG_CB710_DEBUG
149 u32 e, x;
150 e = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
151#endif
152
153 while (!(err = cb710_check_event(slot, what))) {
154 if (!--limit) {
155 cb710_dump_regs(cb710_slot_to_chip(slot),
156 CB710_DUMP_REGS_MMC);
157 err = -ETIMEDOUT;
158 break;
159 }
160 udelay(1);
161 }
162
163#ifdef CONFIG_CB710_DEBUG
164 x = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
165
166 limit = 2000000 - limit;
167 if (limit > 100)
168 dev_dbg(cb710_slot_dev(slot),
169 "WAIT10: waited %d loops, what %d, entry val %08X, exit val %08X\n",
170 limit, what, e, x);
171#endif
172 return err < 0 ? err : 0;
173}
174
175
176static int cb710_wait_while_busy(struct cb710_slot *slot, uint8_t mask)
177{
178 unsigned limit = 500000; /* FIXME: real timeout */
179 int err = 0;
180
181#ifdef CONFIG_CB710_DEBUG
182 u32 e, x;
183 e = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
184#endif
185
186 while (cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT) & mask) {
187 if (!--limit) {
188 cb710_dump_regs(cb710_slot_to_chip(slot),
189 CB710_DUMP_REGS_MMC);
190 err = -ETIMEDOUT;
191 break;
192 }
193 udelay(1);
194 }
195
196#ifdef CONFIG_CB710_DEBUG
197 x = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
198
199 limit = 500000 - limit;
200 if (limit > 100)
201 dev_dbg(cb710_slot_dev(slot),
202 "WAIT12: waited %d loops, mask %02X, entry val %08X, exit val %08X\n",
203 limit, mask, e, x);
204#endif
205 return err;
206}
207
208static void cb710_mmc_set_transfer_size(struct cb710_slot *slot,
209 size_t count, size_t blocksize)
210{
211 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
212 cb710_write_port_32(slot, CB710_MMC_TRANSFER_SIZE_PORT,
213 ((count - 1) << 16)|(blocksize - 1));
214
215 dev_vdbg(cb710_slot_dev(slot), "set up for %zu block%s of %zu bytes\n",
216 count, count == 1 ? "" : "s", blocksize);
217}
218
219static void cb710_mmc_fifo_hack(struct cb710_slot *slot)
220{
221 /* without this, received data is prepended with 8-bytes of zeroes */
222 u32 r1, r2;
223 int ok = 0;
224
225 r1 = cb710_read_port_32(slot, CB710_MMC_DATA_PORT);
226 r2 = cb710_read_port_32(slot, CB710_MMC_DATA_PORT);
227 if (cb710_read_port_8(slot, CB710_MMC_STATUS0_PORT)
228 & CB710_MMC_S0_FIFO_UNDERFLOW) {
229 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT,
230 CB710_MMC_S0_FIFO_UNDERFLOW);
231 ok = 1;
232 }
233
234 dev_dbg(cb710_slot_dev(slot),
235 "FIFO-read-hack: expected STATUS0 bit was %s\n",
236 ok ? "set." : "NOT SET!");
237 dev_dbg(cb710_slot_dev(slot),
238 "FIFO-read-hack: dwords ignored: %08X %08X - %s\n",
239 r1, r2, (r1|r2) ? "BAD (NOT ZERO)!" : "ok");
240}
241
242static int cb710_mmc_receive_pio(struct cb710_slot *slot,
243 struct sg_mapping_iter *miter, size_t dw_count)
244{
245 if (!(cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT) & CB710_MMC_S2_FIFO_READY)) {
246 int err = cb710_wait_for_event(slot,
247 CB710_MMC_S1_PIO_TRANSFER_DONE);
248 if (err)
249 return err;
250 }
251
252 cb710_sg_dwiter_write_from_io(miter,
253 slot->iobase + CB710_MMC_DATA_PORT, dw_count);
254
255 return 0;
256}
257
258static bool cb710_is_transfer_size_supported(struct mmc_data *data)
259{
260 return !(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8));
261}
262
263static int cb710_mmc_receive(struct cb710_slot *slot, struct mmc_data *data)
264{
265 struct sg_mapping_iter miter;
266 size_t len, blocks = data->blocks;
267 int err = 0;
268
269 /* TODO: I don't know how/if the hardware handles non-16B-boundary blocks
270 * except single 8B block */
271 if (unlikely(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8)))
272 return -EINVAL;
273
274 sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_TO_SG);
275
276 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
277 15, CB710_MMC_C2_READ_PIO_SIZE_MASK);
278
279 cb710_mmc_fifo_hack(slot);
280
281 while (blocks-- > 0) {
282 len = data->blksz;
283
284 while (len >= 16) {
285 err = cb710_mmc_receive_pio(slot, &miter, 4);
286 if (err)
287 goto out;
288 len -= 16;
289 }
290
291 if (!len)
292 continue;
293
294 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
295 len - 1, CB710_MMC_C2_READ_PIO_SIZE_MASK);
296
297 len = (len >= 8) ? 4 : 2;
298 err = cb710_mmc_receive_pio(slot, &miter, len);
299 if (err)
300 goto out;
301 }
302out:
303 sg_miter_stop(&miter);
304 return err;
305}
306
307static int cb710_mmc_send(struct cb710_slot *slot, struct mmc_data *data)
308{
309 struct sg_mapping_iter miter;
310 size_t len, blocks = data->blocks;
311 int err = 0;
312
313 /* TODO: I don't know how/if the hardware handles multiple
314 * non-16B-boundary blocks */
315 if (unlikely(data->blocks > 1 && data->blksz & 15))
316 return -EINVAL;
317
318 sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_FROM_SG);
319
320 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
321 0, CB710_MMC_C2_READ_PIO_SIZE_MASK);
322
323 while (blocks-- > 0) {
324 len = (data->blksz + 15) >> 4;
325 do {
326 if (!(cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT)
327 & CB710_MMC_S2_FIFO_EMPTY)) {
328 err = cb710_wait_for_event(slot,
329 CB710_MMC_S1_PIO_TRANSFER_DONE);
330 if (err)
331 goto out;
332 }
333 cb710_sg_dwiter_read_to_io(&miter,
334 slot->iobase + CB710_MMC_DATA_PORT, 4);
335 } while (--len);
336 }
337out:
338 sg_miter_stop(&miter);
339 return err;
340}
341
342static u16 cb710_encode_cmd_flags(struct cb710_mmc_reader *reader,
343 struct mmc_command *cmd)
344{
345 unsigned int flags = cmd->flags;
346 u16 cb_flags = 0;
347
348 /* Windows driver returned 0 for commands for which no response
349 * is expected. It happened that there were only two such commands
350 * used: MMC_GO_IDLE_STATE and MMC_GO_INACTIVE_STATE so it might
351 * as well be a bug in that driver.
352 *
353 * Original driver set bit 14 for MMC/SD application
354 * commands. There's no difference 'on the wire' and
355 * it apparently works without it anyway.
356 */
357
358 switch (flags & MMC_CMD_MASK) {
359 case MMC_CMD_AC: cb_flags = CB710_MMC_CMD_AC; break;
360 case MMC_CMD_ADTC: cb_flags = CB710_MMC_CMD_ADTC; break;
361 case MMC_CMD_BC: cb_flags = CB710_MMC_CMD_BC; break;
362 case MMC_CMD_BCR: cb_flags = CB710_MMC_CMD_BCR; break;
363 }
364
365 if (flags & MMC_RSP_BUSY)
366 cb_flags |= CB710_MMC_RSP_BUSY;
367
368 cb_flags |= cmd->opcode << CB710_MMC_CMD_CODE_SHIFT;
369
370 if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
371 cb_flags |= CB710_MMC_DATA_READ;
372
373 if (flags & MMC_RSP_PRESENT) {
374 /* Windows driver set 01 at bits 4,3 except for
375 * MMC_SET_BLOCKLEN where it set 10. Maybe the
376 * hardware can do something special about this
377 * command? The original driver looks buggy/incomplete
378 * anyway so we ignore this for now.
379 *
380 * I assume that 00 here means no response is expected.
381 */
382 cb_flags |= CB710_MMC_RSP_PRESENT;
383
384 if (flags & MMC_RSP_136)
385 cb_flags |= CB710_MMC_RSP_136;
386 if (!(flags & MMC_RSP_CRC))
387 cb_flags |= CB710_MMC_RSP_NO_CRC;
388 }
389
390 return cb_flags;
391}
392
393static void cb710_receive_response(struct cb710_slot *slot,
394 struct mmc_command *cmd)
395{
396 unsigned rsp_opcode, wanted_opcode;
397
398 /* Looks like final byte with CRC is always stripped (same as SDHCI) */
399 if (cmd->flags & MMC_RSP_136) {
400 u32 resp[4];
401
402 resp[0] = cb710_read_port_32(slot, CB710_MMC_RESPONSE3_PORT);
403 resp[1] = cb710_read_port_32(slot, CB710_MMC_RESPONSE2_PORT);
404 resp[2] = cb710_read_port_32(slot, CB710_MMC_RESPONSE1_PORT);
405 resp[3] = cb710_read_port_32(slot, CB710_MMC_RESPONSE0_PORT);
406 rsp_opcode = resp[0] >> 24;
407
408 cmd->resp[0] = (resp[0] << 8)|(resp[1] >> 24);
409 cmd->resp[1] = (resp[1] << 8)|(resp[2] >> 24);
410 cmd->resp[2] = (resp[2] << 8)|(resp[3] >> 24);
411 cmd->resp[3] = (resp[3] << 8);
412 } else {
413 rsp_opcode = cb710_read_port_32(slot, CB710_MMC_RESPONSE1_PORT) & 0x3F;
414 cmd->resp[0] = cb710_read_port_32(slot, CB710_MMC_RESPONSE0_PORT);
415 }
416
417 wanted_opcode = (cmd->flags & MMC_RSP_OPCODE) ? cmd->opcode : 0x3F;
418 if (rsp_opcode != wanted_opcode)
419 cmd->error = -EILSEQ;
420}
421
422static int cb710_mmc_transfer_data(struct cb710_slot *slot,
423 struct mmc_data *data)
424{
425 int error, to;
426
427 if (data->flags & MMC_DATA_READ)
428 error = cb710_mmc_receive(slot, data);
429 else
430 error = cb710_mmc_send(slot, data);
431
432 to = cb710_wait_for_event(slot, CB710_MMC_S1_DATA_TRANSFER_DONE);
433 if (!error)
434 error = to;
435
436 if (!error)
437 data->bytes_xfered = data->blksz * data->blocks;
438 return error;
439}
440
441static int cb710_mmc_command(struct mmc_host *mmc, struct mmc_command *cmd)
442{
443 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
444 struct cb710_mmc_reader *reader = mmc_priv(mmc);
445 struct mmc_data *data = cmd->data;
446
447 u16 cb_cmd = cb710_encode_cmd_flags(reader, cmd);
448 dev_dbg(cb710_slot_dev(slot), "cmd request: 0x%04X\n", cb_cmd);
449
450 if (data) {
451 if (!cb710_is_transfer_size_supported(data)) {
452 data->error = -EINVAL;
453 return -1;
454 }
455 cb710_mmc_set_transfer_size(slot, data->blocks, data->blksz);
456 }
457
458 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20|CB710_MMC_S2_BUSY_10);
459 cb710_write_port_16(slot, CB710_MMC_CMD_TYPE_PORT, cb_cmd);
460 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
461 cb710_write_port_32(slot, CB710_MMC_CMD_PARAM_PORT, cmd->arg);
462 cb710_mmc_reset_events(slot);
463 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
464 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x01, 0);
465
466 cmd->error = cb710_wait_for_event(slot, CB710_MMC_S1_COMMAND_SENT);
467 if (cmd->error)
468 return -1;
469
470 if (cmd->flags & MMC_RSP_PRESENT) {
471 cb710_receive_response(slot, cmd);
472 if (cmd->error)
473 return -1;
474 }
475
476 if (data)
477 data->error = cb710_mmc_transfer_data(slot, data);
478 return 0;
479}
480
481static void cb710_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
482{
483 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
484 struct cb710_mmc_reader *reader = mmc_priv(mmc);
485
486 WARN_ON(reader->mrq != NULL);
487
488 reader->mrq = mrq;
489 cb710_mmc_enable_irq(slot, CB710_MMC_IE_TEST_MASK, 0);
490
491 if (!cb710_mmc_command(mmc, mrq->cmd) && mrq->stop)
492 cb710_mmc_command(mmc, mrq->stop);
493
494 tasklet_schedule(&reader->finish_req_tasklet);
495}
496
497static int cb710_mmc_powerup(struct cb710_slot *slot)
498{
499#ifdef CONFIG_CB710_DEBUG
500 struct cb710_chip *chip = cb710_slot_to_chip(slot);
501#endif
502 int err;
503
504 /* a lot of magic for now */
505 dev_dbg(cb710_slot_dev(slot), "bus powerup\n");
506 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
507 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
508 if (unlikely(err))
509 return err;
510 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x80, 0);
511 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0x80, 0);
512 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
513 mdelay(1);
514 dev_dbg(cb710_slot_dev(slot), "after delay 1\n");
515 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
516 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
517 if (unlikely(err))
518 return err;
519 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x09, 0);
520 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
521 mdelay(1);
522 dev_dbg(cb710_slot_dev(slot), "after delay 2\n");
523 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
524 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
525 if (unlikely(err))
526 return err;
527 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0, 0x08);
528 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
529 mdelay(2);
530 dev_dbg(cb710_slot_dev(slot), "after delay 3\n");
531 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
532 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x06, 0);
533 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x70, 0);
534 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT, 0x80, 0);
535 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0x03, 0);
536 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
537 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
538 if (unlikely(err))
539 return err;
540 /* This port behaves weird: quick byte reads of 0x08,0x09 return
541 * 0xFF,0x00 after writing 0xFFFF to 0x08; it works correctly when
542 * read/written from userspace... What am I missing here?
543 * (it doesn't depend on write-to-read delay) */
544 cb710_write_port_16(slot, CB710_MMC_CONFIGB_PORT, 0xFFFF);
545 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x06, 0);
546 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
547 dev_dbg(cb710_slot_dev(slot), "bus powerup finished\n");
548
549 return cb710_check_event(slot, 0);
550}
551
552static void cb710_mmc_powerdown(struct cb710_slot *slot)
553{
554 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0, 0x81);
555 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0, 0x80);
556}
557
558static void cb710_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
559{
560 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
561 struct cb710_mmc_reader *reader = mmc_priv(mmc);
562 int err;
563
564 cb710_mmc_select_clock_divider(mmc, ios->clock);
565
566 if (ios->power_mode != reader->last_power_mode) {
567 switch (ios->power_mode) {
568 case MMC_POWER_ON:
569 err = cb710_mmc_powerup(slot);
570 if (err) {
571 dev_warn(cb710_slot_dev(slot),
572 "powerup failed (%d)- retrying\n", err);
573 cb710_mmc_powerdown(slot);
574 udelay(1);
575 err = cb710_mmc_powerup(slot);
576 if (err)
577 dev_warn(cb710_slot_dev(slot),
578 "powerup retry failed (%d) - expect errors\n",
579 err);
580 }
581 reader->last_power_mode = MMC_POWER_ON;
582 break;
583 case MMC_POWER_OFF:
584 cb710_mmc_powerdown(slot);
585 reader->last_power_mode = MMC_POWER_OFF;
586 break;
587 case MMC_POWER_UP:
588 default:
589 /* ignore */
590 break;
591 }
592 }
593
594 cb710_mmc_enable_4bit_data(slot, ios->bus_width != MMC_BUS_WIDTH_1);
595
596 cb710_mmc_enable_irq(slot, CB710_MMC_IE_TEST_MASK, 0);
597}
598
599static int cb710_mmc_get_ro(struct mmc_host *mmc)
600{
601 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
602
603 return cb710_read_port_8(slot, CB710_MMC_STATUS3_PORT)
604 & CB710_MMC_S3_WRITE_PROTECTED;
605}
606
607static int cb710_mmc_get_cd(struct mmc_host *mmc)
608{
609 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
610
611 return cb710_read_port_8(slot, CB710_MMC_STATUS3_PORT)
612 & CB710_MMC_S3_CARD_DETECTED;
613}
614
615static int cb710_mmc_irq_handler(struct cb710_slot *slot)
616{
617 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
618 struct cb710_mmc_reader *reader = mmc_priv(mmc);
619 u32 status, config1, config2, irqen;
620
621 status = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
622 irqen = cb710_read_port_32(slot, CB710_MMC_IRQ_ENABLE_PORT);
623 config2 = cb710_read_port_32(slot, CB710_MMC_CONFIGB_PORT);
624 config1 = cb710_read_port_32(slot, CB710_MMC_CONFIG_PORT);
625
626 dev_dbg(cb710_slot_dev(slot), "interrupt; status: %08X, "
627 "ie: %08X, c2: %08X, c1: %08X\n",
628 status, irqen, config2, config1);
629
630 if (status & (CB710_MMC_S1_CARD_CHANGED << 8)) {
631 /* ack the event */
632 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT,
633 CB710_MMC_S1_CARD_CHANGED);
634 if ((irqen & CB710_MMC_IE_CISTATUS_MASK)
635 == CB710_MMC_IE_CISTATUS_MASK)
636 mmc_detect_change(mmc, HZ/5);
637 } else {
638 dev_dbg(cb710_slot_dev(slot), "unknown interrupt (test)\n");
639 spin_lock(&reader->irq_lock);
640 __cb710_mmc_enable_irq(slot, 0, CB710_MMC_IE_TEST_MASK);
641 spin_unlock(&reader->irq_lock);
642 }
643
644 return 1;
645}
646
647static void cb710_mmc_finish_request_tasklet(unsigned long data)
648{
649 struct mmc_host *mmc = (void *)data;
650 struct cb710_mmc_reader *reader = mmc_priv(mmc);
651 struct mmc_request *mrq = reader->mrq;
652
653 reader->mrq = NULL;
654 mmc_request_done(mmc, mrq);
655}
656
657static const struct mmc_host_ops cb710_mmc_host = {
658 .request = cb710_mmc_request,
659 .set_ios = cb710_mmc_set_ios,
660 .get_ro = cb710_mmc_get_ro,
661 .get_cd = cb710_mmc_get_cd,
662};
663
664#ifdef CONFIG_PM
665
666static int cb710_mmc_suspend(struct platform_device *pdev, pm_message_t state)
667{
668 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
669
670 cb710_mmc_enable_irq(slot, 0, ~0);
671 return 0;
672}
673
674static int cb710_mmc_resume(struct platform_device *pdev)
675{
676 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
677
678 cb710_mmc_enable_irq(slot, 0, ~0);
679 return 0;
680}
681
682#endif /* CONFIG_PM */
683
684static int cb710_mmc_init(struct platform_device *pdev)
685{
686 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
687 struct cb710_chip *chip = cb710_slot_to_chip(slot);
688 struct mmc_host *mmc;
689 struct cb710_mmc_reader *reader;
690 int err;
691 u32 val;
692
693 mmc = mmc_alloc_host(sizeof(*reader), cb710_slot_dev(slot));
694 if (!mmc)
695 return -ENOMEM;
696
697 platform_set_drvdata(pdev, mmc);
698
699 /* harmless (maybe) magic */
700 pci_read_config_dword(chip->pdev, 0x48, &val);
701 val = cb710_src_freq_mhz[(val >> 16) & 0xF];
702 dev_dbg(cb710_slot_dev(slot), "source frequency: %dMHz\n", val);
703 val *= 1000000;
704
705 mmc->ops = &cb710_mmc_host;
706 mmc->f_max = val;
707 mmc->f_min = val >> cb710_clock_divider_log2[CB710_MAX_DIVIDER_IDX];
708 mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
709 mmc->caps = MMC_CAP_4_BIT_DATA;
710
711 reader = mmc_priv(mmc);
712
713 tasklet_init(&reader->finish_req_tasklet,
714 cb710_mmc_finish_request_tasklet, (unsigned long)mmc);
715 spin_lock_init(&reader->irq_lock);
716 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
717
718 cb710_mmc_enable_irq(slot, 0, ~0);
719 cb710_set_irq_handler(slot, cb710_mmc_irq_handler);
720
721 err = mmc_add_host(mmc);
722 if (unlikely(err))
723 goto err_free_mmc;
724
725 dev_dbg(cb710_slot_dev(slot), "mmc_hostname is %s\n",
726 mmc_hostname(mmc));
727
728 cb710_mmc_enable_irq(slot, CB710_MMC_IE_CARD_INSERTION_STATUS, 0);
729
730 return 0;
731
732err_free_mmc:
733 dev_dbg(cb710_slot_dev(slot), "mmc_add_host() failed: %d\n", err);
734
735 cb710_set_irq_handler(slot, NULL);
736 mmc_free_host(mmc);
737 return err;
738}
739
740static int cb710_mmc_exit(struct platform_device *pdev)
741{
742 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
743 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
744 struct cb710_mmc_reader *reader = mmc_priv(mmc);
745
746 cb710_mmc_enable_irq(slot, 0, CB710_MMC_IE_CARD_INSERTION_STATUS);
747
748 mmc_remove_host(mmc);
749
750 /* IRQs should be disabled now, but let's stay on the safe side */
751 cb710_mmc_enable_irq(slot, 0, ~0);
752 cb710_set_irq_handler(slot, NULL);
753
754 /* clear config ports - just in case */
755 cb710_write_port_32(slot, CB710_MMC_CONFIG_PORT, 0);
756 cb710_write_port_16(slot, CB710_MMC_CONFIGB_PORT, 0);
757
758 tasklet_kill(&reader->finish_req_tasklet);
759
760 mmc_free_host(mmc);
761 return 0;
762}
763
764static struct platform_driver cb710_mmc_driver = {
765 .driver.name = "cb710-mmc",
766 .probe = cb710_mmc_init,
767 .remove = cb710_mmc_exit,
768#ifdef CONFIG_PM
769 .suspend = cb710_mmc_suspend,
770 .resume = cb710_mmc_resume,
771#endif
772};
773
774module_platform_driver(cb710_mmc_driver);
775
776MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
777MODULE_DESCRIPTION("ENE CB710 memory card reader driver - MMC/SD part");
778MODULE_LICENSE("GPL");
779MODULE_ALIAS("platform:cb710-mmc");