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
15 static 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
22 static 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
cb710_mmc_select_clock_divider(struct mmc_host * mmc,int hz)27 static 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
__cb710_mmc_enable_irq(struct cb710_slot * slot,unsigned short enable,unsigned short mask)62 static 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
cb710_mmc_enable_irq(struct cb710_slot * slot,unsigned short enable,unsigned short mask)83 static 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
cb710_mmc_reset_events(struct cb710_slot * slot)95 static 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
cb710_mmc_enable_4bit_data(struct cb710_slot * slot,int enable)102 static 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
cb710_check_event(struct cb710_slot * slot,u8 what)112 static 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
cb710_wait_for_event(struct cb710_slot * slot,u8 what)145 static 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
cb710_wait_while_busy(struct cb710_slot * slot,uint8_t mask)178 static 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
cb710_mmc_set_transfer_size(struct cb710_slot * slot,size_t count,size_t blocksize)210 static 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
cb710_mmc_fifo_hack(struct cb710_slot * slot)221 static 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
cb710_mmc_receive_pio(struct cb710_slot * slot,struct sg_mapping_iter * miter,size_t dw_count)244 static 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
cb710_is_transfer_size_supported(struct mmc_data * data)260 static bool cb710_is_transfer_size_supported(struct mmc_data *data)
261 {
262 return !(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8));
263 }
264
cb710_mmc_receive(struct cb710_slot * slot,struct mmc_data * data)265 static 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 }
304 out:
305 sg_miter_stop(&miter);
306 return err;
307 }
308
cb710_mmc_send(struct cb710_slot * slot,struct mmc_data * data)309 static 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 }
339 out:
340 sg_miter_stop(&miter);
341 return err;
342 }
343
cb710_encode_cmd_flags(struct cb710_mmc_reader * reader,struct mmc_command * cmd)344 static 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
cb710_receive_response(struct cb710_slot * slot,struct mmc_command * cmd)395 static 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
cb710_mmc_transfer_data(struct cb710_slot * slot,struct mmc_data * data)424 static 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
cb710_mmc_command(struct mmc_host * mmc,struct mmc_command * cmd)443 static 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
cb710_mmc_request(struct mmc_host * mmc,struct mmc_request * mrq)483 static 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
cb710_mmc_powerup(struct cb710_slot * slot)499 static 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
cb710_mmc_powerdown(struct cb710_slot * slot)554 static 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
cb710_mmc_set_ios(struct mmc_host * mmc,struct mmc_ios * ios)560 static 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
cb710_mmc_get_ro(struct mmc_host * mmc)601 static 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
cb710_mmc_get_cd(struct mmc_host * mmc)609 static 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
cb710_mmc_irq_handler(struct cb710_slot * slot)617 static 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
cb710_mmc_finish_request_tasklet(unsigned long data)649 static void cb710_mmc_finish_request_tasklet(unsigned long data)
650 {
651 struct mmc_host *mmc = (void *)data;
652 struct cb710_mmc_reader *reader = mmc_priv(mmc);
653 struct mmc_request *mrq = reader->mrq;
654
655 reader->mrq = NULL;
656 mmc_request_done(mmc, mrq);
657 }
658
659 static 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
cb710_mmc_suspend(struct platform_device * pdev,pm_message_t state)668 static 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
cb710_mmc_resume(struct platform_device * pdev)676 static 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
cb710_mmc_init(struct platform_device * pdev)686 static 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_init(&reader->finish_req_tasklet,
722 cb710_mmc_finish_request_tasklet, (unsigned long)mmc);
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
740 err_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
cb710_mmc_exit(struct platform_device * pdev)748 static 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
772 static 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
782 module_platform_driver(cb710_mmc_driver);
783
784 MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
785 MODULE_DESCRIPTION("ENE CB710 memory card reader driver - MMC/SD part");
786 MODULE_LICENSE("GPL");
787 MODULE_ALIAS("platform:cb710-mmc");
788