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xtensa: support DMA buffers in high memory
[cris-mirror.git] / drivers / mmc / host / rtsx_pci_sdmmc.c
blob30bd8081307e3244b65e86cc59fd21655dd6c678
1 /* Realtek PCI-Express SD/MMC Card Interface driver
2 *
3 * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2, or (at your option) any
8 * later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, see <http://www.gnu.org/licenses/>.
17 *
18 * Author:
19 * Wei WANG <wei_wang@realsil.com.cn>
20 */
21
22 #include <linux/module.h>
23 #include <linux/slab.h>
24 #include <linux/highmem.h>
25 #include <linux/delay.h>
26 #include <linux/platform_device.h>
27 #include <linux/workqueue.h>
28 #include <linux/mmc/host.h>
29 #include <linux/mmc/mmc.h>
30 #include <linux/mmc/sd.h>
31 #include <linux/mmc/sdio.h>
32 #include <linux/mmc/card.h>
33 #include <linux/rtsx_pci.h>
34 #include <asm/unaligned.h>
35
36 struct realtek_pci_sdmmc {
37 struct platform_device *pdev;
38 struct rtsx_pcr *pcr;
39 struct mmc_host *mmc;
40 struct mmc_request *mrq;
41 #define SDMMC_WORKQ_NAME "rtsx_pci_sdmmc_workq"
42
43 struct work_struct work;
44 struct mutex host_mutex;
45
46 u8 ssc_depth;
47 unsigned int clock;
48 bool vpclk;
49 bool double_clk;
50 bool eject;
51 bool initial_mode;
52 int power_state;
53 #define SDMMC_POWER_ON 1
54 #define SDMMC_POWER_OFF 0
55
56 int sg_count;
57 s32 cookie;
58 int cookie_sg_count;
59 bool using_cookie;
60 };
61
62 static inline struct device *sdmmc_dev(struct realtek_pci_sdmmc *host)
63 {
64 return &(host->pdev->dev);
65 }
66
67 static inline void sd_clear_error(struct realtek_pci_sdmmc *host)
68 {
69 rtsx_pci_write_register(host->pcr, CARD_STOP,
70 SD_STOP | SD_CLR_ERR, SD_STOP | SD_CLR_ERR);
71 }
72
73 #ifdef DEBUG
74 static void dump_reg_range(struct realtek_pci_sdmmc *host, u16 start, u16 end)
75 {
76 u16 len = end - start + 1;
77 int i;
78 u8 data[8];
79
80 for (i = 0; i < len; i += 8) {
81 int j;
82 int n = min(8, len - i);
83
84 memset(&data, 0, sizeof(data));
85 for (j = 0; j < n; j++)
86 rtsx_pci_read_register(host->pcr, start + i + j,
87 data + j);
88 dev_dbg(sdmmc_dev(host), "0x%04X(%d): %8ph\n",
89 start + i, n, data);
90 }
91 }
92
93 static void sd_print_debug_regs(struct realtek_pci_sdmmc *host)
94 {
95 dump_reg_range(host, 0xFDA0, 0xFDB3);
96 dump_reg_range(host, 0xFD52, 0xFD69);
97 }
98 #else
99 #define sd_print_debug_regs(host)
100 #endif /* DEBUG */
101
102 static inline int sd_get_cd_int(struct realtek_pci_sdmmc *host)
103 {
104 return rtsx_pci_readl(host->pcr, RTSX_BIPR) & SD_EXIST;
105 }
106
107 static void sd_cmd_set_sd_cmd(struct rtsx_pcr *pcr, struct mmc_command *cmd)
108 {
109 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CMD0, 0xFF,
110 SD_CMD_START | cmd->opcode);
111 rtsx_pci_write_be32(pcr, SD_CMD1, cmd->arg);
112 }
113
114 static void sd_cmd_set_data_len(struct rtsx_pcr *pcr, u16 blocks, u16 blksz)
115 {
116 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BLOCK_CNT_L, 0xFF, blocks);
117 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BLOCK_CNT_H, 0xFF, blocks >> 8);
118 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, blksz);
119 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BYTE_CNT_H, 0xFF, blksz >> 8);
120 }
121
122 static int sd_response_type(struct mmc_command *cmd)
123 {
124 switch (mmc_resp_type(cmd)) {
125 case MMC_RSP_NONE:
126 return SD_RSP_TYPE_R0;
127 case MMC_RSP_R1:
128 return SD_RSP_TYPE_R1;
129 case MMC_RSP_R1_NO_CRC:
130 return SD_RSP_TYPE_R1 | SD_NO_CHECK_CRC7;
131 case MMC_RSP_R1B:
132 return SD_RSP_TYPE_R1b;
133 case MMC_RSP_R2:
134 return SD_RSP_TYPE_R2;
135 case MMC_RSP_R3:
136 return SD_RSP_TYPE_R3;
137 default:
138 return -EINVAL;
139 }
140 }
141
142 static int sd_status_index(int resp_type)
143 {
144 if (resp_type == SD_RSP_TYPE_R0)
145 return 0;
146 else if (resp_type == SD_RSP_TYPE_R2)
147 return 16;
148
149 return 5;
150 }
151 /*
152 * sd_pre_dma_transfer - do dma_map_sg() or using cookie
153 *
154 * @pre: if called in pre_req()
155 * return:
156 * 0 - do dma_map_sg()
157 * 1 - using cookie
158 */
159 static int sd_pre_dma_transfer(struct realtek_pci_sdmmc *host,
160 struct mmc_data *data, bool pre)
161 {
162 struct rtsx_pcr *pcr = host->pcr;
163 int read = data->flags & MMC_DATA_READ;
164 int count = 0;
165 int using_cookie = 0;
166
167 if (!pre && data->host_cookie && data->host_cookie != host->cookie) {
168 dev_err(sdmmc_dev(host),
169 "error: data->host_cookie = %d, host->cookie = %d\n",
170 data->host_cookie, host->cookie);
171 data->host_cookie = 0;
172 }
173
174 if (pre || data->host_cookie != host->cookie) {
175 count = rtsx_pci_dma_map_sg(pcr, data->sg, data->sg_len, read);
176 } else {
177 count = host->cookie_sg_count;
178 using_cookie = 1;
179 }
180
181 if (pre) {
182 host->cookie_sg_count = count;
183 if (++host->cookie < 0)
184 host->cookie = 1;
185 data->host_cookie = host->cookie;
186 } else {
187 host->sg_count = count;
188 }
189
190 return using_cookie;
191 }
192
193 static void sdmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
194 {
195 struct realtek_pci_sdmmc *host = mmc_priv(mmc);
196 struct mmc_data *data = mrq->data;
197
198 if (data->host_cookie) {
199 dev_err(sdmmc_dev(host),
200 "error: reset data->host_cookie = %d\n",
201 data->host_cookie);
202 data->host_cookie = 0;
203 }
204
205 sd_pre_dma_transfer(host, data, true);
206 dev_dbg(sdmmc_dev(host), "pre dma sg: %d\n", host->cookie_sg_count);
207 }
208
209 static void sdmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
210 int err)
211 {
212 struct realtek_pci_sdmmc *host = mmc_priv(mmc);
213 struct rtsx_pcr *pcr = host->pcr;
214 struct mmc_data *data = mrq->data;
215 int read = data->flags & MMC_DATA_READ;
216
217 rtsx_pci_dma_unmap_sg(pcr, data->sg, data->sg_len, read);
218 data->host_cookie = 0;
219 }
220
221 static void sd_send_cmd_get_rsp(struct realtek_pci_sdmmc *host,
222 struct mmc_command *cmd)
223 {
224 struct rtsx_pcr *pcr = host->pcr;
225 u8 cmd_idx = (u8)cmd->opcode;
226 u32 arg = cmd->arg;
227 int err = 0;
228 int timeout = 100;
229 int i;
230 u8 *ptr;
231 int rsp_type;
232 int stat_idx;
233 bool clock_toggled = false;
234
235 dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
236 __func__, cmd_idx, arg);
237
238 rsp_type = sd_response_type(cmd);
239 if (rsp_type < 0)
240 goto out;
241
242 stat_idx = sd_status_index(rsp_type);
243
244 if (rsp_type == SD_RSP_TYPE_R1b)
245 timeout = cmd->busy_timeout ? cmd->busy_timeout : 3000;
246
247 if (cmd->opcode == SD_SWITCH_VOLTAGE) {
248 err = rtsx_pci_write_register(pcr, SD_BUS_STAT,
249 0xFF, SD_CLK_TOGGLE_EN);
250 if (err < 0)
251 goto out;
252
253 clock_toggled = true;
254 }
255
256 rtsx_pci_init_cmd(pcr);
257 sd_cmd_set_sd_cmd(pcr, cmd);
258 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF, rsp_type);
259 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_DATA_SOURCE,
260 0x01, PINGPONG_BUFFER);
261 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER,
262 0xFF, SD_TM_CMD_RSP | SD_TRANSFER_START);
263 rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
264 SD_TRANSFER_END | SD_STAT_IDLE,
265 SD_TRANSFER_END | SD_STAT_IDLE);
266
267 if (rsp_type == SD_RSP_TYPE_R2) {
268 /* Read data from ping-pong buffer */
269 for (i = PPBUF_BASE2; i < PPBUF_BASE2 + 16; i++)
270 rtsx_pci_add_cmd(pcr, READ_REG_CMD, (u16)i, 0, 0);
271 } else if (rsp_type != SD_RSP_TYPE_R0) {
272 /* Read data from SD_CMDx registers */
273 for (i = SD_CMD0; i <= SD_CMD4; i++)
274 rtsx_pci_add_cmd(pcr, READ_REG_CMD, (u16)i, 0, 0);
275 }
276
277 rtsx_pci_add_cmd(pcr, READ_REG_CMD, SD_STAT1, 0, 0);
278
279 err = rtsx_pci_send_cmd(pcr, timeout);
280 if (err < 0) {
281 sd_print_debug_regs(host);
282 sd_clear_error(host);
283 dev_dbg(sdmmc_dev(host),
284 "rtsx_pci_send_cmd error (err = %d)\n", err);
285 goto out;
286 }
287
288 if (rsp_type == SD_RSP_TYPE_R0) {
289 err = 0;
290 goto out;
291 }
292
293 /* Eliminate returned value of CHECK_REG_CMD */
294 ptr = rtsx_pci_get_cmd_data(pcr) + 1;
295
296 /* Check (Start,Transmission) bit of Response */
297 if ((ptr[0] & 0xC0) != 0) {
298 err = -EILSEQ;
299 dev_dbg(sdmmc_dev(host), "Invalid response bit\n");
300 goto out;
301 }
302
303 /* Check CRC7 */
304 if (!(rsp_type & SD_NO_CHECK_CRC7)) {
305 if (ptr[stat_idx] & SD_CRC7_ERR) {
306 err = -EILSEQ;
307 dev_dbg(sdmmc_dev(host), "CRC7 error\n");
308 goto out;
309 }
310 }
311
312 if (rsp_type == SD_RSP_TYPE_R2) {
313 /*
314 * The controller offloads the last byte {CRC-7, end bit 1'b1}
315 * of response type R2. Assign dummy CRC, 0, and end bit to the
316 * byte(ptr[16], goes into the LSB of resp[3] later).
317 */
318 ptr[16] = 1;
319
320 for (i = 0; i < 4; i++) {
321 cmd->resp[i] = get_unaligned_be32(ptr + 1 + i * 4);
322 dev_dbg(sdmmc_dev(host), "cmd->resp[%d] = 0x%08x\n",
323 i, cmd->resp[i]);
324 }
325 } else {
326 cmd->resp[0] = get_unaligned_be32(ptr + 1);
327 dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
328 cmd->resp[0]);
329 }
330
331 out:
332 cmd->error = err;
333
334 if (err && clock_toggled)
335 rtsx_pci_write_register(pcr, SD_BUS_STAT,
336 SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
337 }
338
339 static int sd_read_data(struct realtek_pci_sdmmc *host, struct mmc_command *cmd,
340 u16 byte_cnt, u8 *buf, int buf_len, int timeout)
341 {
342 struct rtsx_pcr *pcr = host->pcr;
343 int err;
344 u8 trans_mode;
345
346 dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
347 __func__, cmd->opcode, cmd->arg);
348
349 if (!buf)
350 buf_len = 0;
351
352 if (cmd->opcode == MMC_SEND_TUNING_BLOCK)
353 trans_mode = SD_TM_AUTO_TUNING;
354 else
355 trans_mode = SD_TM_NORMAL_READ;
356
357 rtsx_pci_init_cmd(pcr);
358 sd_cmd_set_sd_cmd(pcr, cmd);
359 sd_cmd_set_data_len(pcr, 1, byte_cnt);
360 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF,
361 SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
362 SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_6);
363 if (trans_mode != SD_TM_AUTO_TUNING)
364 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
365 CARD_DATA_SOURCE, 0x01, PINGPONG_BUFFER);
366
367 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER,
368 0xFF, trans_mode | SD_TRANSFER_START);
369 rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
370 SD_TRANSFER_END, SD_TRANSFER_END);
371
372 err = rtsx_pci_send_cmd(pcr, timeout);
373 if (err < 0) {
374 sd_print_debug_regs(host);
375 dev_dbg(sdmmc_dev(host),
376 "rtsx_pci_send_cmd fail (err = %d)\n", err);
377 return err;
378 }
379
380 if (buf && buf_len) {
381 err = rtsx_pci_read_ppbuf(pcr, buf, buf_len);
382 if (err < 0) {
383 dev_dbg(sdmmc_dev(host),
384 "rtsx_pci_read_ppbuf fail (err = %d)\n", err);
385 return err;
386 }
387 }
388
389 return 0;
390 }
391
392 static int sd_write_data(struct realtek_pci_sdmmc *host,
393 struct mmc_command *cmd, u16 byte_cnt, u8 *buf, int buf_len,
394 int timeout)
395 {
396 struct rtsx_pcr *pcr = host->pcr;
397 int err;
398
399 dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
400 __func__, cmd->opcode, cmd->arg);
401
402 if (!buf)
403 buf_len = 0;
404
405 sd_send_cmd_get_rsp(host, cmd);
406 if (cmd->error)
407 return cmd->error;
408
409 if (buf && buf_len) {
410 err = rtsx_pci_write_ppbuf(pcr, buf, buf_len);
411 if (err < 0) {
412 dev_dbg(sdmmc_dev(host),
413 "rtsx_pci_write_ppbuf fail (err = %d)\n", err);
414 return err;
415 }
416 }
417
418 rtsx_pci_init_cmd(pcr);
419 sd_cmd_set_data_len(pcr, 1, byte_cnt);
420 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF,
421 SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
422 SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_0);
423 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
424 SD_TRANSFER_START | SD_TM_AUTO_WRITE_3);
425 rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
426 SD_TRANSFER_END, SD_TRANSFER_END);
427
428 err = rtsx_pci_send_cmd(pcr, timeout);
429 if (err < 0) {
430 sd_print_debug_regs(host);
431 dev_dbg(sdmmc_dev(host),
432 "rtsx_pci_send_cmd fail (err = %d)\n", err);
433 return err;
434 }
435
436 return 0;
437 }
438
439 static int sd_read_long_data(struct realtek_pci_sdmmc *host,
440 struct mmc_request *mrq)
441 {
442 struct rtsx_pcr *pcr = host->pcr;
443 struct mmc_host *mmc = host->mmc;
444 struct mmc_card *card = mmc->card;
445 struct mmc_command *cmd = mrq->cmd;
446 struct mmc_data *data = mrq->data;
447 int uhs = mmc_card_uhs(card);
448 u8 cfg2 = 0;
449 int err;
450 int resp_type;
451 size_t data_len = data->blksz * data->blocks;
452
453 dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
454 __func__, cmd->opcode, cmd->arg);
455
456 resp_type = sd_response_type(cmd);
457 if (resp_type < 0)
458 return resp_type;
459
460 if (!uhs)
461 cfg2 |= SD_NO_CHECK_WAIT_CRC_TO;
462
463 rtsx_pci_init_cmd(pcr);
464 sd_cmd_set_sd_cmd(pcr, cmd);
465 sd_cmd_set_data_len(pcr, data->blocks, data->blksz);
466 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, IRQSTAT0,
467 DMA_DONE_INT, DMA_DONE_INT);
468 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC3,
469 0xFF, (u8)(data_len >> 24));
470 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC2,
471 0xFF, (u8)(data_len >> 16));
472 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC1,
473 0xFF, (u8)(data_len >> 8));
474 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC0, 0xFF, (u8)data_len);
475 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMACTL,
476 0x03 | DMA_PACK_SIZE_MASK,
477 DMA_DIR_FROM_CARD | DMA_EN | DMA_512);
478 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_DATA_SOURCE,
479 0x01, RING_BUFFER);
480 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2 | resp_type);
481 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
482 SD_TRANSFER_START | SD_TM_AUTO_READ_2);
483 rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
484 SD_TRANSFER_END, SD_TRANSFER_END);
485 rtsx_pci_send_cmd_no_wait(pcr);
486
487 err = rtsx_pci_dma_transfer(pcr, data->sg, host->sg_count, 1, 10000);
488 if (err < 0) {
489 sd_print_debug_regs(host);
490 sd_clear_error(host);
491 return err;
492 }
493
494 return 0;
495 }
496
497 static int sd_write_long_data(struct realtek_pci_sdmmc *host,
498 struct mmc_request *mrq)
499 {
500 struct rtsx_pcr *pcr = host->pcr;
501 struct mmc_host *mmc = host->mmc;
502 struct mmc_card *card = mmc->card;
503 struct mmc_command *cmd = mrq->cmd;
504 struct mmc_data *data = mrq->data;
505 int uhs = mmc_card_uhs(card);
506 u8 cfg2;
507 int err;
508 size_t data_len = data->blksz * data->blocks;
509
510 sd_send_cmd_get_rsp(host, cmd);
511 if (cmd->error)
512 return cmd->error;
513
514 dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
515 __func__, cmd->opcode, cmd->arg);
516
517 cfg2 = SD_NO_CALCULATE_CRC7 | SD_CHECK_CRC16 |
518 SD_NO_WAIT_BUSY_END | SD_NO_CHECK_CRC7 | SD_RSP_LEN_0;
519
520 if (!uhs)
521 cfg2 |= SD_NO_CHECK_WAIT_CRC_TO;
522
523 rtsx_pci_init_cmd(pcr);
524 sd_cmd_set_data_len(pcr, data->blocks, data->blksz);
525 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, IRQSTAT0,
526 DMA_DONE_INT, DMA_DONE_INT);
527 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC3,
528 0xFF, (u8)(data_len >> 24));
529 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC2,
530 0xFF, (u8)(data_len >> 16));
531 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC1,
532 0xFF, (u8)(data_len >> 8));
533 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC0, 0xFF, (u8)data_len);
534 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMACTL,
535 0x03 | DMA_PACK_SIZE_MASK,
536 DMA_DIR_TO_CARD | DMA_EN | DMA_512);
537 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_DATA_SOURCE,
538 0x01, RING_BUFFER);
539 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2);
540 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
541 SD_TRANSFER_START | SD_TM_AUTO_WRITE_3);
542 rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
543 SD_TRANSFER_END, SD_TRANSFER_END);
544 rtsx_pci_send_cmd_no_wait(pcr);
545 err = rtsx_pci_dma_transfer(pcr, data->sg, host->sg_count, 0, 10000);
546 if (err < 0) {
547 sd_clear_error(host);
548 return err;
549 }
550
551 return 0;
552 }
553
554 static int sd_rw_multi(struct realtek_pci_sdmmc *host, struct mmc_request *mrq)
555 {
556 struct mmc_data *data = mrq->data;
557
558 if (host->sg_count < 0) {
559 data->error = host->sg_count;
560 dev_dbg(sdmmc_dev(host), "%s: sg_count = %d is invalid\n",
561 __func__, host->sg_count);
562 return data->error;
563 }
564
565 if (data->flags & MMC_DATA_READ)
566 return sd_read_long_data(host, mrq);
567
568 return sd_write_long_data(host, mrq);
569 }
570
571 static inline void sd_enable_initial_mode(struct realtek_pci_sdmmc *host)
572 {
573 rtsx_pci_write_register(host->pcr, SD_CFG1,
574 SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_128);
575 }
576
577 static inline void sd_disable_initial_mode(struct realtek_pci_sdmmc *host)
578 {
579 rtsx_pci_write_register(host->pcr, SD_CFG1,
580 SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_0);
581 }
582
583 static void sd_normal_rw(struct realtek_pci_sdmmc *host,
584 struct mmc_request *mrq)
585 {
586 struct mmc_command *cmd = mrq->cmd;
587 struct mmc_data *data = mrq->data;
588 u8 *buf;
589
590 buf = kzalloc(data->blksz, GFP_NOIO);
591 if (!buf) {
592 cmd->error = -ENOMEM;
593 return;
594 }
595
596 if (data->flags & MMC_DATA_READ) {
597 if (host->initial_mode)
598 sd_disable_initial_mode(host);
599
600 cmd->error = sd_read_data(host, cmd, (u16)data->blksz, buf,
601 data->blksz, 200);
602
603 if (host->initial_mode)
604 sd_enable_initial_mode(host);
605
606 sg_copy_from_buffer(data->sg, data->sg_len, buf, data->blksz);
607 } else {
608 sg_copy_to_buffer(data->sg, data->sg_len, buf, data->blksz);
609
610 cmd->error = sd_write_data(host, cmd, (u16)data->blksz, buf,
611 data->blksz, 200);
612 }
613
614 kfree(buf);
615 }
616
617 static int sd_change_phase(struct realtek_pci_sdmmc *host,
618 u8 sample_point, bool rx)
619 {
620 struct rtsx_pcr *pcr = host->pcr;
621
622 dev_dbg(sdmmc_dev(host), "%s(%s): sample_point = %d\n",
623 __func__, rx ? "RX" : "TX", sample_point);
624
625 rtsx_pci_write_register(pcr, CLK_CTL, CHANGE_CLK, CHANGE_CLK);
626 if (rx)
627 rtsx_pci_write_register(pcr, SD_VPRX_CTL,
628 PHASE_SELECT_MASK, sample_point);
629 else
630 rtsx_pci_write_register(pcr, SD_VPTX_CTL,
631 PHASE_SELECT_MASK, sample_point);
632 rtsx_pci_write_register(pcr, SD_VPCLK0_CTL, PHASE_NOT_RESET, 0);
633 rtsx_pci_write_register(pcr, SD_VPCLK0_CTL, PHASE_NOT_RESET,
634 PHASE_NOT_RESET);
635 rtsx_pci_write_register(pcr, CLK_CTL, CHANGE_CLK, 0);
636 rtsx_pci_write_register(pcr, SD_CFG1, SD_ASYNC_FIFO_NOT_RST, 0);
637
638 return 0;
639 }
640
641 static inline u32 test_phase_bit(u32 phase_map, unsigned int bit)
642 {
643 bit %= RTSX_PHASE_MAX;
644 return phase_map & (1 << bit);
645 }
646
647 static int sd_get_phase_len(u32 phase_map, unsigned int start_bit)
648 {
649 int i;
650
651 for (i = 0; i < RTSX_PHASE_MAX; i++) {
652 if (test_phase_bit(phase_map, start_bit + i) == 0)
653 return i;
654 }
655 return RTSX_PHASE_MAX;
656 }
657
658 static u8 sd_search_final_phase(struct realtek_pci_sdmmc *host, u32 phase_map)
659 {
660 int start = 0, len = 0;
661 int start_final = 0, len_final = 0;
662 u8 final_phase = 0xFF;
663
664 if (phase_map == 0) {
665 dev_err(sdmmc_dev(host), "phase error: [map:%x]\n", phase_map);
666 return final_phase;
667 }
668
669 while (start < RTSX_PHASE_MAX) {
670 len = sd_get_phase_len(phase_map, start);
671 if (len_final < len) {
672 start_final = start;
673 len_final = len;
674 }
675 start += len ? len : 1;
676 }
677
678 final_phase = (start_final + len_final / 2) % RTSX_PHASE_MAX;
679 dev_dbg(sdmmc_dev(host), "phase: [map:%x] [maxlen:%d] [final:%d]\n",
680 phase_map, len_final, final_phase);
681
682 return final_phase;
683 }
684
685 static void sd_wait_data_idle(struct realtek_pci_sdmmc *host)
686 {
687 int err, i;
688 u8 val = 0;
689
690 for (i = 0; i < 100; i++) {
691 err = rtsx_pci_read_register(host->pcr, SD_DATA_STATE, &val);
692 if (val & SD_DATA_IDLE)
693 return;
694
695 udelay(100);
696 }
697 }
698
699 static int sd_tuning_rx_cmd(struct realtek_pci_sdmmc *host,
700 u8 opcode, u8 sample_point)
701 {
702 int err;
703 struct mmc_command cmd = {};
704 struct rtsx_pcr *pcr = host->pcr;
705
706 sd_change_phase(host, sample_point, true);
707
708 rtsx_pci_write_register(pcr, SD_CFG3, SD_RSP_80CLK_TIMEOUT_EN,
709 SD_RSP_80CLK_TIMEOUT_EN);
710
711 cmd.opcode = opcode;
712 err = sd_read_data(host, &cmd, 0x40, NULL, 0, 100);
713 if (err < 0) {
714 /* Wait till SD DATA IDLE */
715 sd_wait_data_idle(host);
716 sd_clear_error(host);
717 rtsx_pci_write_register(pcr, SD_CFG3,
718 SD_RSP_80CLK_TIMEOUT_EN, 0);
719 return err;
720 }
721
722 rtsx_pci_write_register(pcr, SD_CFG3, SD_RSP_80CLK_TIMEOUT_EN, 0);
723 return 0;
724 }
725
726 static int sd_tuning_phase(struct realtek_pci_sdmmc *host,
727 u8 opcode, u32 *phase_map)
728 {
729 int err, i;
730 u32 raw_phase_map = 0;
731
732 for (i = 0; i < RTSX_PHASE_MAX; i++) {
733 err = sd_tuning_rx_cmd(host, opcode, (u8)i);
734 if (err == 0)
735 raw_phase_map |= 1 << i;
736 }
737
738 if (phase_map)
739 *phase_map = raw_phase_map;
740
741 return 0;
742 }
743
744 static int sd_tuning_rx(struct realtek_pci_sdmmc *host, u8 opcode)
745 {
746 int err, i;
747 u32 raw_phase_map[RX_TUNING_CNT] = {0}, phase_map;
748 u8 final_phase;
749
750 for (i = 0; i < RX_TUNING_CNT; i++) {
751 err = sd_tuning_phase(host, opcode, &(raw_phase_map[i]));
752 if (err < 0)
753 return err;
754
755 if (raw_phase_map[i] == 0)
756 break;
757 }
758
759 phase_map = 0xFFFFFFFF;
760 for (i = 0; i < RX_TUNING_CNT; i++) {
761 dev_dbg(sdmmc_dev(host), "RX raw_phase_map[%d] = 0x%08x\n",
762 i, raw_phase_map[i]);
763 phase_map &= raw_phase_map[i];
764 }
765 dev_dbg(sdmmc_dev(host), "RX phase_map = 0x%08x\n", phase_map);
766
767 if (phase_map) {
768 final_phase = sd_search_final_phase(host, phase_map);
769 if (final_phase == 0xFF)
770 return -EINVAL;
771
772 err = sd_change_phase(host, final_phase, true);
773 if (err < 0)
774 return err;
775 } else {
776 return -EINVAL;
777 }
778
779 return 0;
780 }
781
782 static inline int sdio_extblock_cmd(struct mmc_command *cmd,
783 struct mmc_data *data)
784 {
785 return (cmd->opcode == SD_IO_RW_EXTENDED) && (data->blksz == 512);
786 }
787
788 static inline int sd_rw_cmd(struct mmc_command *cmd)
789 {
790 return mmc_op_multi(cmd->opcode) ||
791 (cmd->opcode == MMC_READ_SINGLE_BLOCK) ||
792 (cmd->opcode == MMC_WRITE_BLOCK);
793 }
794
795 static void sd_request(struct work_struct *work)
796 {
797 struct realtek_pci_sdmmc *host = container_of(work,
798 struct realtek_pci_sdmmc, work);
799 struct rtsx_pcr *pcr = host->pcr;
800
801 struct mmc_host *mmc = host->mmc;
802 struct mmc_request *mrq = host->mrq;
803 struct mmc_command *cmd = mrq->cmd;
804 struct mmc_data *data = mrq->data;
805
806 unsigned int data_size = 0;
807 int err;
808
809 if (host->eject || !sd_get_cd_int(host)) {
810 cmd->error = -ENOMEDIUM;
811 goto finish;
812 }
813
814 err = rtsx_pci_card_exclusive_check(host->pcr, RTSX_SD_CARD);
815 if (err) {
816 cmd->error = err;
817 goto finish;
818 }
819
820 mutex_lock(&pcr->pcr_mutex);
821
822 rtsx_pci_start_run(pcr);
823
824 rtsx_pci_switch_clock(pcr, host->clock, host->ssc_depth,
825 host->initial_mode, host->double_clk, host->vpclk);
826 rtsx_pci_write_register(pcr, CARD_SELECT, 0x07, SD_MOD_SEL);
827 rtsx_pci_write_register(pcr, CARD_SHARE_MODE,
828 CARD_SHARE_MASK, CARD_SHARE_48_SD);
829
830 mutex_lock(&host->host_mutex);
831 host->mrq = mrq;
832 mutex_unlock(&host->host_mutex);
833
834 if (mrq->data)
835 data_size = data->blocks * data->blksz;
836
837 if (!data_size) {
838 sd_send_cmd_get_rsp(host, cmd);
839 } else if (sd_rw_cmd(cmd) || sdio_extblock_cmd(cmd, data)) {
840 cmd->error = sd_rw_multi(host, mrq);
841 if (!host->using_cookie)
842 sdmmc_post_req(host->mmc, host->mrq, 0);
843
844 if (mmc_op_multi(cmd->opcode) && mrq->stop)
845 sd_send_cmd_get_rsp(host, mrq->stop);
846 } else {
847 sd_normal_rw(host, mrq);
848 }
849
850 if (mrq->data) {
851 if (cmd->error || data->error)
852 data->bytes_xfered = 0;
853 else
854 data->bytes_xfered = data->blocks * data->blksz;
855 }
856
857 mutex_unlock(&pcr->pcr_mutex);
858
859 finish:
860 if (cmd->error) {
861 dev_dbg(sdmmc_dev(host), "CMD %d 0x%08x error(%d)\n",
862 cmd->opcode, cmd->arg, cmd->error);
863 }
864
865 mutex_lock(&host->host_mutex);
866 host->mrq = NULL;
867 mutex_unlock(&host->host_mutex);
868
869 mmc_request_done(mmc, mrq);
870 }
871
872 static void sdmmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
873 {
874 struct realtek_pci_sdmmc *host = mmc_priv(mmc);
875 struct mmc_data *data = mrq->data;
876
877 mutex_lock(&host->host_mutex);
878 host->mrq = mrq;
879 mutex_unlock(&host->host_mutex);
880
881 if (sd_rw_cmd(mrq->cmd) || sdio_extblock_cmd(mrq->cmd, data))
882 host->using_cookie = sd_pre_dma_transfer(host, data, false);
883
884 schedule_work(&host->work);
885 }
886
887 static int sd_set_bus_width(struct realtek_pci_sdmmc *host,
888 unsigned char bus_width)
889 {
890 int err = 0;
891 u8 width[] = {
892 [MMC_BUS_WIDTH_1] = SD_BUS_WIDTH_1BIT,
893 [MMC_BUS_WIDTH_4] = SD_BUS_WIDTH_4BIT,
894 [MMC_BUS_WIDTH_8] = SD_BUS_WIDTH_8BIT,
895 };
896
897 if (bus_width <= MMC_BUS_WIDTH_8)
898 err = rtsx_pci_write_register(host->pcr, SD_CFG1,
899 0x03, width[bus_width]);
900
901 return err;
902 }
903
904 static int sd_power_on(struct realtek_pci_sdmmc *host)
905 {
906 struct rtsx_pcr *pcr = host->pcr;
907 int err;
908
909 if (host->power_state == SDMMC_POWER_ON)
910 return 0;
911
912 rtsx_pci_init_cmd(pcr);
913 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SELECT, 0x07, SD_MOD_SEL);
914 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SHARE_MODE,
915 CARD_SHARE_MASK, CARD_SHARE_48_SD);
916 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_EN,
917 SD_CLK_EN, SD_CLK_EN);
918 err = rtsx_pci_send_cmd(pcr, 100);
919 if (err < 0)
920 return err;
921
922 err = rtsx_pci_card_pull_ctl_enable(pcr, RTSX_SD_CARD);
923 if (err < 0)
924 return err;
925
926 err = rtsx_pci_card_power_on(pcr, RTSX_SD_CARD);
927 if (err < 0)
928 return err;
929
930 err = rtsx_pci_write_register(pcr, CARD_OE, SD_OUTPUT_EN, SD_OUTPUT_EN);
931 if (err < 0)
932 return err;
933
934 host->power_state = SDMMC_POWER_ON;
935 return 0;
936 }
937
938 static int sd_power_off(struct realtek_pci_sdmmc *host)
939 {
940 struct rtsx_pcr *pcr = host->pcr;
941 int err;
942
943 host->power_state = SDMMC_POWER_OFF;
944
945 rtsx_pci_init_cmd(pcr);
946
947 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_EN, SD_CLK_EN, 0);
948 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_OE, SD_OUTPUT_EN, 0);
949
950 err = rtsx_pci_send_cmd(pcr, 100);
951 if (err < 0)
952 return err;
953
954 err = rtsx_pci_card_power_off(pcr, RTSX_SD_CARD);
955 if (err < 0)
956 return err;
957
958 return rtsx_pci_card_pull_ctl_disable(pcr, RTSX_SD_CARD);
959 }
960
961 static int sd_set_power_mode(struct realtek_pci_sdmmc *host,
962 unsigned char power_mode)
963 {
964 int err;
965
966 if (power_mode == MMC_POWER_OFF)
967 err = sd_power_off(host);
968 else
969 err = sd_power_on(host);
970
971 return err;
972 }
973
974 static int sd_set_timing(struct realtek_pci_sdmmc *host, unsigned char timing)
975 {
976 struct rtsx_pcr *pcr = host->pcr;
977 int err = 0;
978
979 rtsx_pci_init_cmd(pcr);
980
981 switch (timing) {
982 case MMC_TIMING_UHS_SDR104:
983 case MMC_TIMING_UHS_SDR50:
984 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG1,
985 0x0C | SD_ASYNC_FIFO_NOT_RST,
986 SD_30_MODE | SD_ASYNC_FIFO_NOT_RST);
987 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
988 CLK_LOW_FREQ, CLK_LOW_FREQ);
989 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
990 CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
991 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL, CLK_LOW_FREQ, 0);
992 break;
993
994 case MMC_TIMING_MMC_DDR52:
995 case MMC_TIMING_UHS_DDR50:
996 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG1,
997 0x0C | SD_ASYNC_FIFO_NOT_RST,
998 SD_DDR_MODE | SD_ASYNC_FIFO_NOT_RST);
999 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
1000 CLK_LOW_FREQ, CLK_LOW_FREQ);
1001 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1002 CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
1003 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL, CLK_LOW_FREQ, 0);
1004 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1005 DDR_VAR_TX_CMD_DAT, DDR_VAR_TX_CMD_DAT);
1006 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1007 DDR_VAR_RX_DAT | DDR_VAR_RX_CMD,
1008 DDR_VAR_RX_DAT | DDR_VAR_RX_CMD);
1009 break;
1010
1011 case MMC_TIMING_MMC_HS:
1012 case MMC_TIMING_SD_HS:
1013 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG1,
1014 0x0C, SD_20_MODE);
1015 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
1016 CLK_LOW_FREQ, CLK_LOW_FREQ);
1017 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1018 CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1019 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL, CLK_LOW_FREQ, 0);
1020 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1021 SD20_TX_SEL_MASK, SD20_TX_14_AHEAD);
1022 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1023 SD20_RX_SEL_MASK, SD20_RX_14_DELAY);
1024 break;
1025
1026 default:
1027 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
1028 SD_CFG1, 0x0C, SD_20_MODE);
1029 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
1030 CLK_LOW_FREQ, CLK_LOW_FREQ);
1031 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1032 CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1033 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL, CLK_LOW_FREQ, 0);
1034 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
1035 SD_PUSH_POINT_CTL, 0xFF, 0);
1036 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1037 SD20_RX_SEL_MASK, SD20_RX_POS_EDGE);
1038 break;
1039 }
1040
1041 err = rtsx_pci_send_cmd(pcr, 100);
1042
1043 return err;
1044 }
1045
1046 static void sdmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1047 {
1048 struct realtek_pci_sdmmc *host = mmc_priv(mmc);
1049 struct rtsx_pcr *pcr = host->pcr;
1050
1051 if (host->eject)
1052 return;
1053
1054 if (rtsx_pci_card_exclusive_check(host->pcr, RTSX_SD_CARD))
1055 return;
1056
1057 mutex_lock(&pcr->pcr_mutex);
1058
1059 rtsx_pci_start_run(pcr);
1060
1061 sd_set_bus_width(host, ios->bus_width);
1062 sd_set_power_mode(host, ios->power_mode);
1063 sd_set_timing(host, ios->timing);
1064
1065 host->vpclk = false;
1066 host->double_clk = true;
1067
1068 switch (ios->timing) {
1069 case MMC_TIMING_UHS_SDR104:
1070 case MMC_TIMING_UHS_SDR50:
1071 host->ssc_depth = RTSX_SSC_DEPTH_2M;
1072 host->vpclk = true;
1073 host->double_clk = false;
1074 break;
1075 case MMC_TIMING_MMC_DDR52:
1076 case MMC_TIMING_UHS_DDR50:
1077 case MMC_TIMING_UHS_SDR25:
1078 host->ssc_depth = RTSX_SSC_DEPTH_1M;
1079 break;
1080 default:
1081 host->ssc_depth = RTSX_SSC_DEPTH_500K;
1082 break;
1083 }
1084
1085 host->initial_mode = (ios->clock <= 1000000) ? true : false;
1086
1087 host->clock = ios->clock;
1088 rtsx_pci_switch_clock(pcr, ios->clock, host->ssc_depth,
1089 host->initial_mode, host->double_clk, host->vpclk);
1090
1091 mutex_unlock(&pcr->pcr_mutex);
1092 }
1093
1094 static int sdmmc_get_ro(struct mmc_host *mmc)
1095 {
1096 struct realtek_pci_sdmmc *host = mmc_priv(mmc);
1097 struct rtsx_pcr *pcr = host->pcr;
1098 int ro = 0;
1099 u32 val;
1100
1101 if (host->eject)
1102 return -ENOMEDIUM;
1103
1104 mutex_lock(&pcr->pcr_mutex);
1105
1106 rtsx_pci_start_run(pcr);
1107
1108 /* Check SD mechanical write-protect switch */
1109 val = rtsx_pci_readl(pcr, RTSX_BIPR);
1110 dev_dbg(sdmmc_dev(host), "%s: RTSX_BIPR = 0x%08x\n", __func__, val);
1111 if (val & SD_WRITE_PROTECT)
1112 ro = 1;
1113
1114 mutex_unlock(&pcr->pcr_mutex);
1115
1116 return ro;
1117 }
1118
1119 static int sdmmc_get_cd(struct mmc_host *mmc)
1120 {
1121 struct realtek_pci_sdmmc *host = mmc_priv(mmc);
1122 struct rtsx_pcr *pcr = host->pcr;
1123 int cd = 0;
1124 u32 val;
1125
1126 if (host->eject)
1127 return cd;
1128
1129 mutex_lock(&pcr->pcr_mutex);
1130
1131 rtsx_pci_start_run(pcr);
1132
1133 /* Check SD card detect */
1134 val = rtsx_pci_card_exist(pcr);
1135 dev_dbg(sdmmc_dev(host), "%s: RTSX_BIPR = 0x%08x\n", __func__, val);
1136 if (val & SD_EXIST)
1137 cd = 1;
1138
1139 mutex_unlock(&pcr->pcr_mutex);
1140
1141 return cd;
1142 }
1143
1144 static int sd_wait_voltage_stable_1(struct realtek_pci_sdmmc *host)
1145 {
1146 struct rtsx_pcr *pcr = host->pcr;
1147 int err;
1148 u8 stat;
1149
1150 /* Reference to Signal Voltage Switch Sequence in SD spec.
1151 * Wait for a period of time so that the card can drive SD_CMD and
1152 * SD_DAT[3:0] to low after sending back CMD11 response.
1153 */
1154 mdelay(1);
1155
1156 /* SD_CMD, SD_DAT[3:0] should be driven to low by card;
1157 * If either one of SD_CMD,SD_DAT[3:0] is not low,
1158 * abort the voltage switch sequence;
1159 */
1160 err = rtsx_pci_read_register(pcr, SD_BUS_STAT, &stat);
1161 if (err < 0)
1162 return err;
1163
1164 if (stat & (SD_CMD_STATUS | SD_DAT3_STATUS | SD_DAT2_STATUS |
1165 SD_DAT1_STATUS | SD_DAT0_STATUS))
1166 return -EINVAL;
1167
1168 /* Stop toggle SD clock */
1169 err = rtsx_pci_write_register(pcr, SD_BUS_STAT,
1170 0xFF, SD_CLK_FORCE_STOP);
1171 if (err < 0)
1172 return err;
1173
1174 return 0;
1175 }
1176
1177 static int sd_wait_voltage_stable_2(struct realtek_pci_sdmmc *host)
1178 {
1179 struct rtsx_pcr *pcr = host->pcr;
1180 int err;
1181 u8 stat, mask, val;
1182
1183 /* Wait 1.8V output of voltage regulator in card stable */
1184 msleep(50);
1185
1186 /* Toggle SD clock again */
1187 err = rtsx_pci_write_register(pcr, SD_BUS_STAT, 0xFF, SD_CLK_TOGGLE_EN);
1188 if (err < 0)
1189 return err;
1190
1191 /* Wait for a period of time so that the card can drive
1192 * SD_DAT[3:0] to high at 1.8V
1193 */
1194 msleep(20);
1195
1196 /* SD_CMD, SD_DAT[3:0] should be pulled high by host */
1197 err = rtsx_pci_read_register(pcr, SD_BUS_STAT, &stat);
1198 if (err < 0)
1199 return err;
1200
1201 mask = SD_CMD_STATUS | SD_DAT3_STATUS | SD_DAT2_STATUS |
1202 SD_DAT1_STATUS | SD_DAT0_STATUS;
1203 val = SD_CMD_STATUS | SD_DAT3_STATUS | SD_DAT2_STATUS |
1204 SD_DAT1_STATUS | SD_DAT0_STATUS;
1205 if ((stat & mask) != val) {
1206 dev_dbg(sdmmc_dev(host),
1207 "%s: SD_BUS_STAT = 0x%x\n", __func__, stat);
1208 rtsx_pci_write_register(pcr, SD_BUS_STAT,
1209 SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
1210 rtsx_pci_write_register(pcr, CARD_CLK_EN, 0xFF, 0);
1211 return -EINVAL;
1212 }
1213
1214 return 0;
1215 }
1216
1217 static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1218 {
1219 struct realtek_pci_sdmmc *host = mmc_priv(mmc);
1220 struct rtsx_pcr *pcr = host->pcr;
1221 int err = 0;
1222 u8 voltage;
1223
1224 dev_dbg(sdmmc_dev(host), "%s: signal_voltage = %d\n",
1225 __func__, ios->signal_voltage);
1226
1227 if (host->eject)
1228 return -ENOMEDIUM;
1229
1230 err = rtsx_pci_card_exclusive_check(host->pcr, RTSX_SD_CARD);
1231 if (err)
1232 return err;
1233
1234 mutex_lock(&pcr->pcr_mutex);
1235
1236 rtsx_pci_start_run(pcr);
1237
1238 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1239 voltage = OUTPUT_3V3;
1240 else
1241 voltage = OUTPUT_1V8;
1242
1243 if (voltage == OUTPUT_1V8) {
1244 err = sd_wait_voltage_stable_1(host);
1245 if (err < 0)
1246 goto out;
1247 }
1248
1249 err = rtsx_pci_switch_output_voltage(pcr, voltage);
1250 if (err < 0)
1251 goto out;
1252
1253 if (voltage == OUTPUT_1V8) {
1254 err = sd_wait_voltage_stable_2(host);
1255 if (err < 0)
1256 goto out;
1257 }
1258
1259 out:
1260 /* Stop toggle SD clock in idle */
1261 err = rtsx_pci_write_register(pcr, SD_BUS_STAT,
1262 SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
1263
1264 mutex_unlock(&pcr->pcr_mutex);
1265
1266 return err;
1267 }
1268
1269 static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
1270 {
1271 struct realtek_pci_sdmmc *host = mmc_priv(mmc);
1272 struct rtsx_pcr *pcr = host->pcr;
1273 int err = 0;
1274
1275 if (host->eject)
1276 return -ENOMEDIUM;
1277
1278 err = rtsx_pci_card_exclusive_check(host->pcr, RTSX_SD_CARD);
1279 if (err)
1280 return err;
1281
1282 mutex_lock(&pcr->pcr_mutex);
1283
1284 rtsx_pci_start_run(pcr);
1285
1286 /* Set initial TX phase */
1287 switch (mmc->ios.timing) {
1288 case MMC_TIMING_UHS_SDR104:
1289 err = sd_change_phase(host, SDR104_TX_PHASE(pcr), false);
1290 break;
1291
1292 case MMC_TIMING_UHS_SDR50:
1293 err = sd_change_phase(host, SDR50_TX_PHASE(pcr), false);
1294 break;
1295
1296 case MMC_TIMING_UHS_DDR50:
1297 err = sd_change_phase(host, DDR50_TX_PHASE(pcr), false);
1298 break;
1299
1300 default:
1301 err = 0;
1302 }
1303
1304 if (err)
1305 goto out;
1306
1307 /* Tuning RX phase */
1308 if ((mmc->ios.timing == MMC_TIMING_UHS_SDR104) ||
1309 (mmc->ios.timing == MMC_TIMING_UHS_SDR50))
1310 err = sd_tuning_rx(host, opcode);
1311 else if (mmc->ios.timing == MMC_TIMING_UHS_DDR50)
1312 err = sd_change_phase(host, DDR50_RX_PHASE(pcr), true);
1313
1314 out:
1315 mutex_unlock(&pcr->pcr_mutex);
1316
1317 return err;
1318 }
1319
1320 static const struct mmc_host_ops realtek_pci_sdmmc_ops = {
1321 .pre_req = sdmmc_pre_req,
1322 .post_req = sdmmc_post_req,
1323 .request = sdmmc_request,
1324 .set_ios = sdmmc_set_ios,
1325 .get_ro = sdmmc_get_ro,
1326 .get_cd = sdmmc_get_cd,
1327 .start_signal_voltage_switch = sdmmc_switch_voltage,
1328 .execute_tuning = sdmmc_execute_tuning,
1329 };
1330
1331 static void init_extra_caps(struct realtek_pci_sdmmc *host)
1332 {
1333 struct mmc_host *mmc = host->mmc;
1334 struct rtsx_pcr *pcr = host->pcr;
1335
1336 dev_dbg(sdmmc_dev(host), "pcr->extra_caps = 0x%x\n", pcr->extra_caps);
1337
1338 if (pcr->extra_caps & EXTRA_CAPS_SD_SDR50)
1339 mmc->caps |= MMC_CAP_UHS_SDR50;
1340 if (pcr->extra_caps & EXTRA_CAPS_SD_SDR104)
1341 mmc->caps |= MMC_CAP_UHS_SDR104;
1342 if (pcr->extra_caps & EXTRA_CAPS_SD_DDR50)
1343 mmc->caps |= MMC_CAP_UHS_DDR50;
1344 if (pcr->extra_caps & EXTRA_CAPS_MMC_HSDDR)
1345 mmc->caps |= MMC_CAP_1_8V_DDR;
1346 if (pcr->extra_caps & EXTRA_CAPS_MMC_8BIT)
1347 mmc->caps |= MMC_CAP_8_BIT_DATA;
1348 }
1349
1350 static void realtek_init_host(struct realtek_pci_sdmmc *host)
1351 {
1352 struct mmc_host *mmc = host->mmc;
1353
1354 mmc->f_min = 250000;
1355 mmc->f_max = 208000000;
1356 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
1357 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED |
1358 MMC_CAP_MMC_HIGHSPEED | MMC_CAP_BUS_WIDTH_TEST |
1359 MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | MMC_CAP_ERASE;
1360 mmc->caps2 = MMC_CAP2_NO_PRESCAN_POWERUP | MMC_CAP2_FULL_PWR_CYCLE;
1361 mmc->max_current_330 = 400;
1362 mmc->max_current_180 = 800;
1363 mmc->ops = &realtek_pci_sdmmc_ops;
1364
1365 init_extra_caps(host);
1366
1367 mmc->max_segs = 256;
1368 mmc->max_seg_size = 65536;
1369 mmc->max_blk_size = 512;
1370 mmc->max_blk_count = 65535;
1371 mmc->max_req_size = 524288;
1372 }
1373
1374 static void rtsx_pci_sdmmc_card_event(struct platform_device *pdev)
1375 {
1376 struct realtek_pci_sdmmc *host = platform_get_drvdata(pdev);
1377
1378 host->cookie = -1;
1379 mmc_detect_change(host->mmc, 0);
1380 }
1381
1382 static int rtsx_pci_sdmmc_drv_probe(struct platform_device *pdev)
1383 {
1384 struct mmc_host *mmc;
1385 struct realtek_pci_sdmmc *host;
1386 struct rtsx_pcr *pcr;
1387 struct pcr_handle *handle = pdev->dev.platform_data;
1388
1389 if (!handle)
1390 return -ENXIO;
1391
1392 pcr = handle->pcr;
1393 if (!pcr)
1394 return -ENXIO;
1395
1396 dev_dbg(&(pdev->dev), ": Realtek PCI-E SDMMC controller found\n");
1397
1398 mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
1399 if (!mmc)
1400 return -ENOMEM;
1401
1402 host = mmc_priv(mmc);
1403 host->pcr = pcr;
1404 host->mmc = mmc;
1405 host->pdev = pdev;
1406 host->cookie = -1;
1407 host->power_state = SDMMC_POWER_OFF;
1408 INIT_WORK(&host->work, sd_request);
1409 platform_set_drvdata(pdev, host);
1410 pcr->slots[RTSX_SD_CARD].p_dev = pdev;
1411 pcr->slots[RTSX_SD_CARD].card_event = rtsx_pci_sdmmc_card_event;
1412
1413 mutex_init(&host->host_mutex);
1414
1415 realtek_init_host(host);
1416
1417 mmc_add_host(mmc);
1418
1419 return 0;
1420 }
1421
1422 static int rtsx_pci_sdmmc_drv_remove(struct platform_device *pdev)
1423 {
1424 struct realtek_pci_sdmmc *host = platform_get_drvdata(pdev);
1425 struct rtsx_pcr *pcr;
1426 struct mmc_host *mmc;
1427
1428 if (!host)
1429 return 0;
1430
1431 pcr = host->pcr;
1432 pcr->slots[RTSX_SD_CARD].p_dev = NULL;
1433 pcr->slots[RTSX_SD_CARD].card_event = NULL;
1434 mmc = host->mmc;
1435
1436 cancel_work_sync(&host->work);
1437
1438 mutex_lock(&host->host_mutex);
1439 if (host->mrq) {
1440 dev_dbg(&(pdev->dev),
1441 "%s: Controller removed during transfer\n",
1442 mmc_hostname(mmc));
1443
1444 rtsx_pci_complete_unfinished_transfer(pcr);
1445
1446 host->mrq->cmd->error = -ENOMEDIUM;
1447 if (host->mrq->stop)
1448 host->mrq->stop->error = -ENOMEDIUM;
1449 mmc_request_done(mmc, host->mrq);
1450 }
1451 mutex_unlock(&host->host_mutex);
1452
1453 mmc_remove_host(mmc);
1454 host->eject = true;
1455
1456 flush_work(&host->work);
1457
1458 mmc_free_host(mmc);
1459
1460 dev_dbg(&(pdev->dev),
1461 ": Realtek PCI-E SDMMC controller has been removed\n");
1462
1463 return 0;
1464 }
1465
1466 static const struct platform_device_id rtsx_pci_sdmmc_ids[] = {
1467 {
1468 .name = DRV_NAME_RTSX_PCI_SDMMC,
1469 }, {
1470 /* sentinel */
1471 }
1472 };
1473 MODULE_DEVICE_TABLE(platform, rtsx_pci_sdmmc_ids);
1474
1475 static struct platform_driver rtsx_pci_sdmmc_driver = {
1476 .probe = rtsx_pci_sdmmc_drv_probe,
1477 .remove = rtsx_pci_sdmmc_drv_remove,
1478 .id_table = rtsx_pci_sdmmc_ids,
1479 .driver = {
1480 .name = DRV_NAME_RTSX_PCI_SDMMC,
1481 },
1482 };
1483 module_platform_driver(rtsx_pci_sdmmc_driver);
1484
1485 MODULE_LICENSE("GPL");
1486 MODULE_AUTHOR("Wei WANG <wei_wang@realsil.com.cn>");
1487 MODULE_DESCRIPTION("Realtek PCI-E SD/MMC Card Host Driver");
CRIS linux kernel tree