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Linux 6.14-rc3
[linux.git] / drivers / mmc / host / rtsx_usb_sdmmc.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Realtek USB SD/MMC Card Interface driver
3  *
4  * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
5  *
6  * Author:
7  *   Roger Tseng <[email protected]>
8  */
9
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/delay.h>
13 #include <linux/platform_device.h>
14 #include <linux/usb.h>
15 #include <linux/mmc/host.h>
16 #include <linux/mmc/mmc.h>
17 #include <linux/mmc/sd.h>
18 #include <linux/mmc/card.h>
19 #include <linux/scatterlist.h>
20 #include <linux/pm.h>
21 #include <linux/pm_runtime.h>
22
23 #include <linux/rtsx_usb.h>
24 #include <linux/unaligned.h>
25
26 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
27                 defined(CONFIG_MMC_REALTEK_USB_MODULE))
28 #include <linux/leds.h>
29 #include <linux/workqueue.h>
30 #define RTSX_USB_USE_LEDS_CLASS
31 #endif
32
33 struct rtsx_usb_sdmmc {
34         struct platform_device  *pdev;
35         struct rtsx_ucr *ucr;
36         struct mmc_host         *mmc;
37         struct mmc_request      *mrq;
38
39         struct mutex            host_mutex;
40
41         u8                      ssc_depth;
42         unsigned int            clock;
43         bool                    vpclk;
44         bool                    double_clk;
45         bool                    host_removal;
46         bool                    card_exist;
47         bool                    initial_mode;
48         bool                    ddr_mode;
49
50         unsigned char           power_mode;
51
52 #ifdef RTSX_USB_USE_LEDS_CLASS
53         struct led_classdev     led;
54         char                    led_name[32];
55         struct work_struct      led_work;
56 #endif
57 };
58
59 static inline struct device *sdmmc_dev(struct rtsx_usb_sdmmc *host)
60 {
61         return &(host->pdev->dev);
62 }
63
64 static inline void sd_clear_error(struct rtsx_usb_sdmmc *host)
65 {
66         struct rtsx_ucr *ucr = host->ucr;
67         rtsx_usb_ep0_write_register(ucr, CARD_STOP,
68                                   SD_STOP | SD_CLR_ERR,
69                                   SD_STOP | SD_CLR_ERR);
70
71         rtsx_usb_clear_dma_err(ucr);
72         rtsx_usb_clear_fsm_err(ucr);
73 }
74
75 #ifdef DEBUG
76 static void sd_print_debug_regs(struct rtsx_usb_sdmmc *host)
77 {
78         struct rtsx_ucr *ucr = host->ucr;
79         u8 val = 0;
80
81         rtsx_usb_ep0_read_register(ucr, SD_STAT1, &val);
82         dev_dbg(sdmmc_dev(host), "SD_STAT1: 0x%x\n", val);
83         rtsx_usb_ep0_read_register(ucr, SD_STAT2, &val);
84         dev_dbg(sdmmc_dev(host), "SD_STAT2: 0x%x\n", val);
85         rtsx_usb_ep0_read_register(ucr, SD_BUS_STAT, &val);
86         dev_dbg(sdmmc_dev(host), "SD_BUS_STAT: 0x%x\n", val);
87 }
88 #else
89 #define sd_print_debug_regs(host)
90 #endif /* DEBUG */
91
92 static int sd_read_data(struct rtsx_usb_sdmmc *host, struct mmc_command *cmd,
93                u16 byte_cnt, u8 *buf, int buf_len, int timeout)
94 {
95         struct rtsx_ucr *ucr = host->ucr;
96         int err;
97         u8 trans_mode;
98
99         if (!buf)
100                 buf_len = 0;
101
102         rtsx_usb_init_cmd(ucr);
103         if (cmd != NULL) {
104                 dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD%d\n", __func__
105                                 , cmd->opcode);
106                 if (cmd->opcode == MMC_SEND_TUNING_BLOCK)
107                         trans_mode = SD_TM_AUTO_TUNING;
108                 else
109                         trans_mode = SD_TM_NORMAL_READ;
110
111                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
112                                 SD_CMD0, 0xFF, (u8)(cmd->opcode) | 0x40);
113                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
114                                 SD_CMD1, 0xFF, (u8)(cmd->arg >> 24));
115                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
116                                 SD_CMD2, 0xFF, (u8)(cmd->arg >> 16));
117                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
118                                 SD_CMD3, 0xFF, (u8)(cmd->arg >> 8));
119                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
120                                 SD_CMD4, 0xFF, (u8)cmd->arg);
121         } else {
122                 trans_mode = SD_TM_AUTO_READ_3;
123         }
124
125         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, (u8)byte_cnt);
126         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H,
127                         0xFF, (u8)(byte_cnt >> 8));
128         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L, 0xFF, 1);
129         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H, 0xFF, 0);
130
131         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF,
132                         SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
133                         SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_6);
134         if (trans_mode != SD_TM_AUTO_TUNING)
135                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
136                                 CARD_DATA_SOURCE, 0x01, PINGPONG_BUFFER);
137
138         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER,
139                         0xFF, trans_mode | SD_TRANSFER_START);
140         rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
141                         SD_TRANSFER_END, SD_TRANSFER_END);
142
143         if (cmd != NULL) {
144                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD1, 0, 0);
145                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD2, 0, 0);
146                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD3, 0, 0);
147                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD4, 0, 0);
148         }
149
150         err = rtsx_usb_send_cmd(ucr, MODE_CR, timeout);
151         if (err) {
152                 dev_dbg(sdmmc_dev(host),
153                         "rtsx_usb_send_cmd failed (err = %d)\n", err);
154                 return err;
155         }
156
157         err = rtsx_usb_get_rsp(ucr, !cmd ? 1 : 5, timeout);
158         if (err || (ucr->rsp_buf[0] & SD_TRANSFER_ERR)) {
159                 sd_print_debug_regs(host);
160
161                 if (!err) {
162                         dev_dbg(sdmmc_dev(host),
163                                 "Transfer failed (SD_TRANSFER = %02x)\n",
164                                 ucr->rsp_buf[0]);
165                         err = -EIO;
166                 } else {
167                         dev_dbg(sdmmc_dev(host),
168                                 "rtsx_usb_get_rsp failed (err = %d)\n", err);
169                 }
170
171                 return err;
172         }
173
174         if (cmd != NULL) {
175                 cmd->resp[0] = get_unaligned_be32(ucr->rsp_buf + 1);
176                 dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
177                                 cmd->resp[0]);
178         }
179
180         if (buf && buf_len) {
181                 /* 2-byte aligned part */
182                 err = rtsx_usb_read_ppbuf(ucr, buf, byte_cnt - (byte_cnt % 2));
183                 if (err) {
184                         dev_dbg(sdmmc_dev(host),
185                                 "rtsx_usb_read_ppbuf failed (err = %d)\n", err);
186                         return err;
187                 }
188
189                 /* unaligned byte */
190                 if (byte_cnt % 2)
191                         return rtsx_usb_read_register(ucr,
192                                         PPBUF_BASE2 + byte_cnt,
193                                         buf + byte_cnt - 1);
194         }
195
196         return 0;
197 }
198
199 static int sd_write_data(struct rtsx_usb_sdmmc *host, struct mmc_command *cmd,
200                 u16 byte_cnt, u8 *buf, int buf_len, int timeout)
201 {
202         struct rtsx_ucr *ucr = host->ucr;
203         int err;
204         u8 trans_mode;
205
206         if (!buf)
207                 buf_len = 0;
208
209         if (buf && buf_len) {
210                 err = rtsx_usb_write_ppbuf(ucr, buf, buf_len);
211                 if (err) {
212                         dev_dbg(sdmmc_dev(host),
213                                 "rtsx_usb_write_ppbuf failed (err = %d)\n",
214                                 err);
215                         return err;
216                 }
217         }
218
219         trans_mode = (cmd != NULL) ? SD_TM_AUTO_WRITE_2 : SD_TM_AUTO_WRITE_3;
220         rtsx_usb_init_cmd(ucr);
221
222         if (cmd != NULL) {
223                 dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD%d\n", __func__,
224                                 cmd->opcode);
225                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
226                                 SD_CMD0, 0xFF, (u8)(cmd->opcode) | 0x40);
227                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
228                                 SD_CMD1, 0xFF, (u8)(cmd->arg >> 24));
229                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
230                                 SD_CMD2, 0xFF, (u8)(cmd->arg >> 16));
231                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
232                                 SD_CMD3, 0xFF, (u8)(cmd->arg >> 8));
233                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
234                                 SD_CMD4, 0xFF, (u8)cmd->arg);
235         }
236
237         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, (u8)byte_cnt);
238         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H,
239                         0xFF, (u8)(byte_cnt >> 8));
240         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L, 0xFF, 1);
241         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H, 0xFF, 0);
242
243         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF,
244                 SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
245                 SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_6);
246         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
247                         CARD_DATA_SOURCE, 0x01, PINGPONG_BUFFER);
248
249         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
250                         trans_mode | SD_TRANSFER_START);
251         rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
252                         SD_TRANSFER_END, SD_TRANSFER_END);
253
254         if (cmd != NULL) {
255                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD1, 0, 0);
256                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD2, 0, 0);
257                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD3, 0, 0);
258                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD4, 0, 0);
259         }
260
261         err = rtsx_usb_send_cmd(ucr, MODE_CR, timeout);
262         if (err) {
263                 dev_dbg(sdmmc_dev(host),
264                         "rtsx_usb_send_cmd failed (err = %d)\n", err);
265                 return err;
266         }
267
268         err = rtsx_usb_get_rsp(ucr, !cmd ? 1 : 5, timeout);
269         if (err) {
270                 sd_print_debug_regs(host);
271                 dev_dbg(sdmmc_dev(host),
272                         "rtsx_usb_get_rsp failed (err = %d)\n", err);
273                 return err;
274         }
275
276         if (cmd != NULL) {
277                 cmd->resp[0] = get_unaligned_be32(ucr->rsp_buf + 1);
278                 dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
279                                 cmd->resp[0]);
280         }
281
282         return 0;
283 }
284
285 static void sd_send_cmd_get_rsp(struct rtsx_usb_sdmmc *host,
286                 struct mmc_command *cmd)
287 {
288         struct rtsx_ucr *ucr = host->ucr;
289         u8 cmd_idx = (u8)cmd->opcode;
290         u32 arg = cmd->arg;
291         int err = 0;
292         int timeout = 100;
293         int i;
294         u8 *ptr;
295         int stat_idx = 0;
296         int len = 2;
297         u8 rsp_type;
298
299         dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
300                         __func__, cmd_idx, arg);
301
302         /* Response type:
303          * R0
304          * R1, R5, R6, R7
305          * R1b
306          * R2
307          * R3, R4
308          */
309         switch (mmc_resp_type(cmd)) {
310         case MMC_RSP_NONE:
311                 rsp_type = SD_RSP_TYPE_R0;
312                 break;
313         case MMC_RSP_R1:
314                 rsp_type = SD_RSP_TYPE_R1;
315                 break;
316         case MMC_RSP_R1B:
317                 rsp_type = SD_RSP_TYPE_R1b;
318                 break;
319         case MMC_RSP_R2:
320                 rsp_type = SD_RSP_TYPE_R2;
321                 break;
322         case MMC_RSP_R3:
323                 rsp_type = SD_RSP_TYPE_R3;
324                 break;
325         default:
326                 dev_dbg(sdmmc_dev(host), "cmd->flag is not valid\n");
327                 err = -EINVAL;
328                 goto out;
329         }
330
331         if (rsp_type == SD_RSP_TYPE_R1b)
332                 timeout = cmd->busy_timeout ? cmd->busy_timeout : 3000;
333
334         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
335                 err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
336                                 SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
337                                 SD_CLK_TOGGLE_EN);
338                 if (err)
339                         goto out;
340         }
341
342         rtsx_usb_init_cmd(ucr);
343
344         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD0, 0xFF, 0x40 | cmd_idx);
345         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD1, 0xFF, (u8)(arg >> 24));
346         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD2, 0xFF, (u8)(arg >> 16));
347         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD3, 0xFF, (u8)(arg >> 8));
348         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD4, 0xFF, (u8)arg);
349
350         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF, rsp_type);
351         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
352                         0x01, PINGPONG_BUFFER);
353         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER,
354                         0xFF, SD_TM_CMD_RSP | SD_TRANSFER_START);
355         rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
356                      SD_TRANSFER_END | SD_STAT_IDLE,
357                      SD_TRANSFER_END | SD_STAT_IDLE);
358
359         if (rsp_type == SD_RSP_TYPE_R2) {
360                 /* Read data from ping-pong buffer */
361                 for (i = PPBUF_BASE2; i < PPBUF_BASE2 + 16; i++)
362                         rtsx_usb_add_cmd(ucr, READ_REG_CMD, (u16)i, 0, 0);
363                 stat_idx = 16;
364         } else if (rsp_type != SD_RSP_TYPE_R0) {
365                 /* Read data from SD_CMDx registers */
366                 for (i = SD_CMD0; i <= SD_CMD4; i++)
367                         rtsx_usb_add_cmd(ucr, READ_REG_CMD, (u16)i, 0, 0);
368                 stat_idx = 5;
369         }
370         len += stat_idx;
371
372         rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_STAT1, 0, 0);
373
374         err = rtsx_usb_send_cmd(ucr, MODE_CR, 100);
375         if (err) {
376                 dev_dbg(sdmmc_dev(host),
377                         "rtsx_usb_send_cmd error (err = %d)\n", err);
378                 goto out;
379         }
380
381         err = rtsx_usb_get_rsp(ucr, len, timeout);
382         if (err || (ucr->rsp_buf[0] & SD_TRANSFER_ERR)) {
383                 sd_print_debug_regs(host);
384                 sd_clear_error(host);
385
386                 if (!err) {
387                         dev_dbg(sdmmc_dev(host),
388                                 "Transfer failed (SD_TRANSFER = %02x)\n",
389                                         ucr->rsp_buf[0]);
390                         err = -EIO;
391                 } else {
392                         dev_dbg(sdmmc_dev(host),
393                                 "rtsx_usb_get_rsp failed (err = %d)\n", err);
394                 }
395
396                 goto out;
397         }
398
399         if (rsp_type == SD_RSP_TYPE_R0) {
400                 err = 0;
401                 goto out;
402         }
403
404         /* Skip result of CHECK_REG_CMD */
405         ptr = ucr->rsp_buf + 1;
406
407         /* Check (Start,Transmission) bit of Response */
408         if ((ptr[0] & 0xC0) != 0) {
409                 err = -EILSEQ;
410                 dev_dbg(sdmmc_dev(host), "Invalid response bit\n");
411                 goto out;
412         }
413
414         /* Check CRC7 */
415         if (!(rsp_type & SD_NO_CHECK_CRC7)) {
416                 if (ptr[stat_idx] & SD_CRC7_ERR) {
417                         err = -EILSEQ;
418                         dev_dbg(sdmmc_dev(host), "CRC7 error\n");
419                         goto out;
420                 }
421         }
422
423         if (rsp_type == SD_RSP_TYPE_R2) {
424                 /*
425                  * The controller offloads the last byte {CRC-7, end bit 1'b1}
426                  * of response type R2. Assign dummy CRC, 0, and end bit to the
427                  * byte(ptr[16], goes into the LSB of resp[3] later).
428                  */
429                 ptr[16] = 1;
430
431                 for (i = 0; i < 4; i++) {
432                         cmd->resp[i] = get_unaligned_be32(ptr + 1 + i * 4);
433                         dev_dbg(sdmmc_dev(host), "cmd->resp[%d] = 0x%08x\n",
434                                         i, cmd->resp[i]);
435                 }
436         } else {
437                 cmd->resp[0] = get_unaligned_be32(ptr + 1);
438                 dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
439                                 cmd->resp[0]);
440         }
441
442 out:
443         cmd->error = err;
444 }
445
446 static int sd_rw_multi(struct rtsx_usb_sdmmc *host, struct mmc_request *mrq)
447 {
448         struct rtsx_ucr *ucr = host->ucr;
449         struct mmc_data *data = mrq->data;
450         int read = (data->flags & MMC_DATA_READ) ? 1 : 0;
451         u8 cfg2, trans_mode;
452         int err;
453         u8 flag;
454         size_t data_len = data->blksz * data->blocks;
455         unsigned int pipe;
456
457         if (read) {
458                 dev_dbg(sdmmc_dev(host), "%s: read %zu bytes\n",
459                                 __func__, data_len);
460                 cfg2 = SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
461                         SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_0;
462                 trans_mode = SD_TM_AUTO_READ_3;
463         } else {
464                 dev_dbg(sdmmc_dev(host), "%s: write %zu bytes\n",
465                                 __func__, data_len);
466                 cfg2 = SD_NO_CALCULATE_CRC7 | SD_CHECK_CRC16 |
467                         SD_NO_WAIT_BUSY_END | SD_NO_CHECK_CRC7 | SD_RSP_LEN_0;
468                 trans_mode = SD_TM_AUTO_WRITE_3;
469         }
470
471         rtsx_usb_init_cmd(ucr);
472
473         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, 0x00);
474         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H, 0xFF, 0x02);
475         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L,
476                         0xFF, (u8)data->blocks);
477         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H,
478                         0xFF, (u8)(data->blocks >> 8));
479
480         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
481                         0x01, RING_BUFFER);
482
483         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC3,
484                         0xFF, (u8)(data_len >> 24));
485         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC2,
486                         0xFF, (u8)(data_len >> 16));
487         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC1,
488                         0xFF, (u8)(data_len >> 8));
489         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC0,
490                         0xFF, (u8)data_len);
491         if (read) {
492                 flag = MODE_CDIR;
493                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_CTL,
494                                 0x03 | DMA_PACK_SIZE_MASK,
495                                 DMA_DIR_FROM_CARD | DMA_EN | DMA_512);
496         } else {
497                 flag = MODE_CDOR;
498                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_CTL,
499                                 0x03 | DMA_PACK_SIZE_MASK,
500                                 DMA_DIR_TO_CARD | DMA_EN | DMA_512);
501         }
502
503         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2);
504         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
505                         trans_mode | SD_TRANSFER_START);
506         rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
507                         SD_TRANSFER_END, SD_TRANSFER_END);
508
509         err = rtsx_usb_send_cmd(ucr, flag, 100);
510         if (err)
511                 return err;
512
513         if (read)
514                 pipe = usb_rcvbulkpipe(ucr->pusb_dev, EP_BULK_IN);
515         else
516                 pipe = usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT);
517
518         err = rtsx_usb_transfer_data(ucr, pipe, data->sg, data_len,
519                         data->sg_len,  NULL, 10000);
520         if (err) {
521                 dev_dbg(sdmmc_dev(host), "rtsx_usb_transfer_data error %d\n"
522                                 , err);
523                 sd_clear_error(host);
524                 return err;
525         }
526
527         return rtsx_usb_get_rsp(ucr, 1, 2000);
528 }
529
530 static inline void sd_enable_initial_mode(struct rtsx_usb_sdmmc *host)
531 {
532         rtsx_usb_write_register(host->ucr, SD_CFG1,
533                         SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_128);
534 }
535
536 static inline void sd_disable_initial_mode(struct rtsx_usb_sdmmc *host)
537 {
538         rtsx_usb_write_register(host->ucr, SD_CFG1,
539                         SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_0);
540 }
541
542 static void sd_normal_rw(struct rtsx_usb_sdmmc *host,
543                 struct mmc_request *mrq)
544 {
545         struct mmc_command *cmd = mrq->cmd;
546         struct mmc_data *data = mrq->data;
547         u8 *buf;
548
549         buf = kzalloc(data->blksz, GFP_NOIO);
550         if (!buf) {
551                 cmd->error = -ENOMEM;
552                 return;
553         }
554
555         if (data->flags & MMC_DATA_READ) {
556                 if (host->initial_mode)
557                         sd_disable_initial_mode(host);
558
559                 cmd->error = sd_read_data(host, cmd, (u16)data->blksz, buf,
560                                 data->blksz, 200);
561
562                 if (host->initial_mode)
563                         sd_enable_initial_mode(host);
564
565                 sg_copy_from_buffer(data->sg, data->sg_len, buf, data->blksz);
566         } else {
567                 sg_copy_to_buffer(data->sg, data->sg_len, buf, data->blksz);
568
569                 cmd->error = sd_write_data(host, cmd, (u16)data->blksz, buf,
570                                 data->blksz, 200);
571         }
572
573         kfree(buf);
574 }
575
576 static int sd_change_phase(struct rtsx_usb_sdmmc *host, u8 sample_point, int tx)
577 {
578         struct rtsx_ucr *ucr = host->ucr;
579
580         dev_dbg(sdmmc_dev(host), "%s: %s sample_point = %d\n",
581                         __func__, tx ? "TX" : "RX", sample_point);
582
583         rtsx_usb_init_cmd(ucr);
584
585         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, CLK_CHANGE);
586
587         if (tx)
588                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
589                                 0x0F, sample_point);
590         else
591                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK1_CTL,
592                                 0x0F, sample_point);
593
594         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL, PHASE_NOT_RESET, 0);
595         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
596                         PHASE_NOT_RESET, PHASE_NOT_RESET);
597         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, 0);
598         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1, SD_ASYNC_FIFO_RST, 0);
599
600         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
601 }
602
603 static inline u32 get_phase_point(u32 phase_map, unsigned int idx)
604 {
605         idx &= MAX_PHASE;
606         return phase_map & (1 << idx);
607 }
608
609 static int get_phase_len(u32 phase_map, unsigned int idx)
610 {
611         int i;
612
613         for (i = 0; i < MAX_PHASE + 1; i++) {
614                 if (get_phase_point(phase_map, idx + i) == 0)
615                         return i;
616         }
617         return MAX_PHASE + 1;
618 }
619
620 static u8 sd_search_final_phase(struct rtsx_usb_sdmmc *host, u32 phase_map)
621 {
622         int start = 0, len = 0;
623         int start_final = 0, len_final = 0;
624         u8 final_phase = 0xFF;
625
626         if (phase_map == 0) {
627                 dev_dbg(sdmmc_dev(host), "Phase: [map:%x]\n", phase_map);
628                 return final_phase;
629         }
630
631         while (start < MAX_PHASE + 1) {
632                 len = get_phase_len(phase_map, start);
633                 if (len_final < len) {
634                         start_final = start;
635                         len_final = len;
636                 }
637                 start += len ? len : 1;
638         }
639
640         final_phase = (start_final + len_final / 2) & MAX_PHASE;
641         dev_dbg(sdmmc_dev(host), "Phase: [map:%x] [maxlen:%d] [final:%d]\n",
642                 phase_map, len_final, final_phase);
643
644         return final_phase;
645 }
646
647 static void sd_wait_data_idle(struct rtsx_usb_sdmmc *host)
648 {
649         int i;
650         u8 val = 0;
651
652         for (i = 0; i < 100; i++) {
653                 rtsx_usb_ep0_read_register(host->ucr, SD_DATA_STATE, &val);
654                 if (val & SD_DATA_IDLE)
655                         return;
656
657                 usleep_range(100, 1000);
658         }
659 }
660
661 static int sd_tuning_rx_cmd(struct rtsx_usb_sdmmc *host,
662                 u8 opcode, u8 sample_point)
663 {
664         int err;
665         struct mmc_command cmd = {};
666
667         err = sd_change_phase(host, sample_point, 0);
668         if (err)
669                 return err;
670
671         cmd.opcode = MMC_SEND_TUNING_BLOCK;
672         err = sd_read_data(host, &cmd, 0x40, NULL, 0, 100);
673         if (err) {
674                 /* Wait till SD DATA IDLE */
675                 sd_wait_data_idle(host);
676                 sd_clear_error(host);
677                 return err;
678         }
679
680         return 0;
681 }
682
683 static void sd_tuning_phase(struct rtsx_usb_sdmmc *host,
684                 u8 opcode, u16 *phase_map)
685 {
686         int err, i;
687         u16 raw_phase_map = 0;
688
689         for (i = MAX_PHASE; i >= 0; i--) {
690                 err = sd_tuning_rx_cmd(host, opcode, (u8)i);
691                 if (!err)
692                         raw_phase_map |= 1 << i;
693         }
694
695         if (phase_map)
696                 *phase_map = raw_phase_map;
697 }
698
699 static int sd_tuning_rx(struct rtsx_usb_sdmmc *host, u8 opcode)
700 {
701         int err, i;
702         u16 raw_phase_map[RX_TUNING_CNT] = {0}, phase_map;
703         u8 final_phase;
704
705         /* setting fixed default TX phase */
706         err = sd_change_phase(host, 0x01, 1);
707         if (err) {
708                 dev_dbg(sdmmc_dev(host), "TX phase setting failed\n");
709                 return err;
710         }
711
712         /* tuning RX phase */
713         for (i = 0; i < RX_TUNING_CNT; i++) {
714                 sd_tuning_phase(host, opcode, &(raw_phase_map[i]));
715
716                 if (raw_phase_map[i] == 0)
717                         break;
718         }
719
720         phase_map = 0xFFFF;
721         for (i = 0; i < RX_TUNING_CNT; i++) {
722                 dev_dbg(sdmmc_dev(host), "RX raw_phase_map[%d] = 0x%04x\n",
723                                 i, raw_phase_map[i]);
724                 phase_map &= raw_phase_map[i];
725         }
726         dev_dbg(sdmmc_dev(host), "RX phase_map = 0x%04x\n", phase_map);
727
728         if (phase_map) {
729                 final_phase = sd_search_final_phase(host, phase_map);
730                 if (final_phase == 0xFF)
731                         return -EINVAL;
732
733                 err = sd_change_phase(host, final_phase, 0);
734                 if (err)
735                         return err;
736         } else {
737                 return -EINVAL;
738         }
739
740         return 0;
741 }
742
743 static int sdmmc_get_ro(struct mmc_host *mmc)
744 {
745         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
746         struct rtsx_ucr *ucr = host->ucr;
747         int err;
748         u16 val;
749
750         if (host->host_removal)
751                 return -ENOMEDIUM;
752
753         mutex_lock(&ucr->dev_mutex);
754
755         /* Check SD card detect */
756         err = rtsx_usb_get_card_status(ucr, &val);
757
758         mutex_unlock(&ucr->dev_mutex);
759
760
761         /* Treat failed detection as non-ro */
762         if (err)
763                 return 0;
764
765         if (val & SD_WP)
766                 return 1;
767
768         return 0;
769 }
770
771 static int sdmmc_get_cd(struct mmc_host *mmc)
772 {
773         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
774         struct rtsx_ucr *ucr = host->ucr;
775         int err;
776         u16 val;
777
778         if (host->host_removal)
779                 return -ENOMEDIUM;
780
781         mutex_lock(&ucr->dev_mutex);
782
783         /* Check SD card detect */
784         err = rtsx_usb_get_card_status(ucr, &val);
785
786         mutex_unlock(&ucr->dev_mutex);
787
788         /* Treat failed detection as non-exist */
789         if (err)
790                 goto no_card;
791
792         if (val & SD_CD) {
793                 host->card_exist = true;
794                 return 1;
795         }
796
797 no_card:
798         host->card_exist = false;
799         return 0;
800 }
801
802 static void sdmmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
803 {
804         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
805         struct rtsx_ucr *ucr = host->ucr;
806         struct mmc_command *cmd = mrq->cmd;
807         struct mmc_data *data = mrq->data;
808         unsigned int data_size = 0;
809
810         dev_dbg(sdmmc_dev(host), "%s\n", __func__);
811
812         if (host->host_removal) {
813                 cmd->error = -ENOMEDIUM;
814                 goto finish;
815         }
816
817         if ((!host->card_exist)) {
818                 cmd->error = -ENOMEDIUM;
819                 goto finish_detect_card;
820         }
821
822         mutex_lock(&ucr->dev_mutex);
823
824         mutex_lock(&host->host_mutex);
825         host->mrq = mrq;
826         mutex_unlock(&host->host_mutex);
827
828         if (mrq->data)
829                 data_size = data->blocks * data->blksz;
830
831         if (!data_size) {
832                 sd_send_cmd_get_rsp(host, cmd);
833         } else if ((!(data_size % 512) && cmd->opcode != MMC_SEND_EXT_CSD) ||
834                    mmc_op_multi(cmd->opcode)) {
835                 sd_send_cmd_get_rsp(host, cmd);
836
837                 if (!cmd->error) {
838                         sd_rw_multi(host, mrq);
839
840                         if (mmc_op_multi(cmd->opcode) && mrq->stop) {
841                                 sd_send_cmd_get_rsp(host, mrq->stop);
842                                 rtsx_usb_write_register(ucr, MC_FIFO_CTL,
843                                                 FIFO_FLUSH, FIFO_FLUSH);
844                         }
845                 }
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(&ucr->dev_mutex);
858
859 finish_detect_card:
860         if (cmd->error) {
861                 /*
862                  * detect card when fail to update card existence state and
863                  * speed up card removal when retry
864                  */
865                 sdmmc_get_cd(mmc);
866                 dev_dbg(sdmmc_dev(host), "cmd->error = %d\n", cmd->error);
867         }
868
869 finish:
870         mutex_lock(&host->host_mutex);
871         host->mrq = NULL;
872         mutex_unlock(&host->host_mutex);
873
874         mmc_request_done(mmc, mrq);
875 }
876
877 static int sd_set_bus_width(struct rtsx_usb_sdmmc *host,
878                 unsigned char bus_width)
879 {
880         int err = 0;
881         static const u8 width[] = {
882                 [MMC_BUS_WIDTH_1] = SD_BUS_WIDTH_1BIT,
883                 [MMC_BUS_WIDTH_4] = SD_BUS_WIDTH_4BIT,
884                 [MMC_BUS_WIDTH_8] = SD_BUS_WIDTH_8BIT,
885         };
886
887         if (bus_width <= MMC_BUS_WIDTH_8)
888                 err = rtsx_usb_write_register(host->ucr, SD_CFG1,
889                                 0x03, width[bus_width]);
890
891         return err;
892 }
893
894 static int sd_pull_ctl_disable_lqfp48(struct rtsx_ucr *ucr)
895 {
896         rtsx_usb_init_cmd(ucr);
897
898         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x55);
899         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
900         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
901         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
902         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
903         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0xA5);
904
905         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
906 }
907
908 static int sd_pull_ctl_disable_qfn24(struct rtsx_ucr *ucr)
909 {
910         rtsx_usb_init_cmd(ucr);
911
912         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x65);
913         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
914         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
915         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
916         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x56);
917         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x59);
918
919         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
920 }
921
922 static int sd_pull_ctl_enable_lqfp48(struct rtsx_ucr *ucr)
923 {
924         rtsx_usb_init_cmd(ucr);
925
926         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0xAA);
927         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0xAA);
928         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0xA9);
929         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
930         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
931         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0xA5);
932
933         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
934 }
935
936 static int sd_pull_ctl_enable_qfn24(struct rtsx_ucr *ucr)
937 {
938         rtsx_usb_init_cmd(ucr);
939
940         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0xA5);
941         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x9A);
942         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0xA5);
943         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x9A);
944         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x65);
945         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x5A);
946
947         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
948 }
949
950 static int sd_power_on(struct rtsx_usb_sdmmc *host)
951 {
952         struct rtsx_ucr *ucr = host->ucr;
953         int err;
954
955         dev_dbg(sdmmc_dev(host), "%s\n", __func__);
956         rtsx_usb_init_cmd(ucr);
957         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SELECT, 0x07, SD_MOD_SEL);
958         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SHARE_MODE,
959                         CARD_SHARE_MASK, CARD_SHARE_SD);
960         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN,
961                         SD_CLK_EN, SD_CLK_EN);
962         err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
963         if (err)
964                 return err;
965
966         if (CHECK_PKG(ucr, LQFP48))
967                 err = sd_pull_ctl_enable_lqfp48(ucr);
968         else
969                 err = sd_pull_ctl_enable_qfn24(ucr);
970         if (err)
971                 return err;
972
973         err = rtsx_usb_write_register(ucr, CARD_PWR_CTL,
974                         POWER_MASK, PARTIAL_POWER_ON);
975         if (err)
976                 return err;
977
978         usleep_range(800, 1000);
979
980         rtsx_usb_init_cmd(ucr);
981         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
982                         POWER_MASK|LDO3318_PWR_MASK, POWER_ON|LDO_ON);
983         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE,
984                         SD_OUTPUT_EN, SD_OUTPUT_EN);
985
986         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
987 }
988
989 static int sd_power_off(struct rtsx_usb_sdmmc *host)
990 {
991         struct rtsx_ucr *ucr = host->ucr;
992         int err;
993
994         dev_dbg(sdmmc_dev(host), "%s\n", __func__);
995         rtsx_usb_init_cmd(ucr);
996
997         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN, SD_CLK_EN, 0);
998         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE, SD_OUTPUT_EN, 0);
999         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
1000                         POWER_MASK, POWER_OFF);
1001         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
1002                         POWER_MASK|LDO3318_PWR_MASK, POWER_OFF|LDO_SUSPEND);
1003
1004         err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
1005         if (err)
1006                 return err;
1007
1008         if (CHECK_PKG(ucr, LQFP48))
1009                         return sd_pull_ctl_disable_lqfp48(ucr);
1010         return sd_pull_ctl_disable_qfn24(ucr);
1011 }
1012
1013 static int sd_set_power_mode(struct rtsx_usb_sdmmc *host,
1014                 unsigned char power_mode)
1015 {
1016         int err;
1017
1018         if (power_mode != MMC_POWER_OFF)
1019                 power_mode = MMC_POWER_ON;
1020
1021         if (power_mode == host->power_mode)
1022                 return 0;
1023
1024         if (power_mode == MMC_POWER_OFF) {
1025                 err = sd_power_off(host);
1026                 pm_runtime_put_noidle(sdmmc_dev(host));
1027         } else {
1028                 pm_runtime_get_noresume(sdmmc_dev(host));
1029                 err = sd_power_on(host);
1030         }
1031
1032         if (!err)
1033                 host->power_mode = power_mode;
1034
1035         return err;
1036 }
1037
1038 static int sd_set_timing(struct rtsx_usb_sdmmc *host,
1039                 unsigned char timing, bool *ddr_mode)
1040 {
1041         struct rtsx_ucr *ucr = host->ucr;
1042
1043         *ddr_mode = false;
1044
1045         rtsx_usb_init_cmd(ucr);
1046
1047         switch (timing) {
1048         case MMC_TIMING_UHS_SDR104:
1049         case MMC_TIMING_UHS_SDR50:
1050                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1051                                 0x0C | SD_ASYNC_FIFO_RST,
1052                                 SD_30_MODE | SD_ASYNC_FIFO_RST);
1053                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1054                                 CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
1055                 break;
1056
1057         case MMC_TIMING_UHS_DDR50:
1058                 *ddr_mode = true;
1059
1060                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1061                                 0x0C | SD_ASYNC_FIFO_RST,
1062                                 SD_DDR_MODE | SD_ASYNC_FIFO_RST);
1063                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1064                                 CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
1065                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1066                                 DDR_VAR_TX_CMD_DAT, DDR_VAR_TX_CMD_DAT);
1067                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1068                                 DDR_VAR_RX_DAT | DDR_VAR_RX_CMD,
1069                                 DDR_VAR_RX_DAT | DDR_VAR_RX_CMD);
1070                 break;
1071
1072         case MMC_TIMING_MMC_HS:
1073         case MMC_TIMING_SD_HS:
1074                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1075                                 0x0C, SD_20_MODE);
1076                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1077                                 CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1078                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1079                                 SD20_TX_SEL_MASK, SD20_TX_14_AHEAD);
1080                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1081                                 SD20_RX_SEL_MASK, SD20_RX_14_DELAY);
1082                 break;
1083
1084         default:
1085                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
1086                                 SD_CFG1, 0x0C, SD_20_MODE);
1087                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1088                                 CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1089                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
1090                                 SD_PUSH_POINT_CTL, 0xFF, 0);
1091                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1092                                 SD20_RX_SEL_MASK, SD20_RX_POS_EDGE);
1093                 break;
1094         }
1095
1096         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
1097 }
1098
1099 static void sdmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1100 {
1101         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1102         struct rtsx_ucr *ucr = host->ucr;
1103
1104         dev_dbg(sdmmc_dev(host), "%s\n", __func__);
1105         mutex_lock(&ucr->dev_mutex);
1106
1107         sd_set_power_mode(host, ios->power_mode);
1108         sd_set_bus_width(host, ios->bus_width);
1109         sd_set_timing(host, ios->timing, &host->ddr_mode);
1110
1111         host->vpclk = false;
1112         host->double_clk = true;
1113
1114         switch (ios->timing) {
1115         case MMC_TIMING_UHS_SDR104:
1116         case MMC_TIMING_UHS_SDR50:
1117                 host->ssc_depth = SSC_DEPTH_2M;
1118                 host->vpclk = true;
1119                 host->double_clk = false;
1120                 break;
1121         case MMC_TIMING_UHS_DDR50:
1122         case MMC_TIMING_UHS_SDR25:
1123                 host->ssc_depth = SSC_DEPTH_1M;
1124                 break;
1125         default:
1126                 host->ssc_depth = SSC_DEPTH_512K;
1127                 break;
1128         }
1129
1130         host->initial_mode = (ios->clock <= 1000000) ? true : false;
1131         host->clock = ios->clock;
1132
1133         rtsx_usb_switch_clock(host->ucr, host->clock, host->ssc_depth,
1134                         host->initial_mode, host->double_clk, host->vpclk);
1135
1136         mutex_unlock(&ucr->dev_mutex);
1137         dev_dbg(sdmmc_dev(host), "%s end\n", __func__);
1138 }
1139
1140 static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1141 {
1142         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1143         struct rtsx_ucr *ucr = host->ucr;
1144         int err = 0;
1145
1146         dev_dbg(sdmmc_dev(host), "%s: signal_voltage = %d\n",
1147                         __func__, ios->signal_voltage);
1148
1149         if (host->host_removal)
1150                 return -ENOMEDIUM;
1151
1152         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_120)
1153                 return -EPERM;
1154
1155         mutex_lock(&ucr->dev_mutex);
1156
1157         err = rtsx_usb_card_exclusive_check(ucr, RTSX_USB_SD_CARD);
1158         if (err) {
1159                 mutex_unlock(&ucr->dev_mutex);
1160                 return err;
1161         }
1162
1163         /* Let mmc core do the busy checking, simply stop the forced-toggle
1164          * clock(while issuing CMD11) and switch voltage.
1165          */
1166         rtsx_usb_init_cmd(ucr);
1167
1168         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1169                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PAD_CTL,
1170                                 SD_IO_USING_1V8, SD_IO_USING_3V3);
1171                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG,
1172                                 TUNE_SD18_MASK, TUNE_SD18_3V3);
1173         } else {
1174                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BUS_STAT,
1175                                 SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
1176                                 SD_CLK_FORCE_STOP);
1177                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PAD_CTL,
1178                                 SD_IO_USING_1V8, SD_IO_USING_1V8);
1179                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG,
1180                                 TUNE_SD18_MASK, TUNE_SD18_1V8);
1181         }
1182
1183         err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
1184         mutex_unlock(&ucr->dev_mutex);
1185
1186         return err;
1187 }
1188
1189 static int sdmmc_card_busy(struct mmc_host *mmc)
1190 {
1191         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1192         struct rtsx_ucr *ucr = host->ucr;
1193         int err;
1194         u8 stat;
1195         u8 mask = SD_DAT3_STATUS | SD_DAT2_STATUS | SD_DAT1_STATUS
1196                 | SD_DAT0_STATUS;
1197
1198         dev_dbg(sdmmc_dev(host), "%s\n", __func__);
1199
1200         mutex_lock(&ucr->dev_mutex);
1201
1202         err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
1203                         SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
1204                         SD_CLK_TOGGLE_EN);
1205         if (err)
1206                 goto out;
1207
1208         mdelay(1);
1209
1210         err = rtsx_usb_read_register(ucr, SD_BUS_STAT, &stat);
1211         if (err)
1212                 goto out;
1213
1214         err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
1215                         SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
1216 out:
1217         mutex_unlock(&ucr->dev_mutex);
1218
1219         if (err)
1220                 return err;
1221
1222         /* check if any pin between dat[0:3] is low */
1223         if ((stat & mask) != mask)
1224                 return 1;
1225         else
1226                 return 0;
1227 }
1228
1229 static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
1230 {
1231         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1232         struct rtsx_ucr *ucr = host->ucr;
1233         int err = 0;
1234
1235         if (host->host_removal)
1236                 return -ENOMEDIUM;
1237
1238         mutex_lock(&ucr->dev_mutex);
1239
1240         if (!host->ddr_mode)
1241                 err = sd_tuning_rx(host, MMC_SEND_TUNING_BLOCK);
1242
1243         mutex_unlock(&ucr->dev_mutex);
1244
1245         return err;
1246 }
1247
1248 static const struct mmc_host_ops rtsx_usb_sdmmc_ops = {
1249         .request = sdmmc_request,
1250         .set_ios = sdmmc_set_ios,
1251         .get_ro = sdmmc_get_ro,
1252         .get_cd = sdmmc_get_cd,
1253         .start_signal_voltage_switch = sdmmc_switch_voltage,
1254         .card_busy = sdmmc_card_busy,
1255         .execute_tuning = sdmmc_execute_tuning,
1256 };
1257
1258 #ifdef RTSX_USB_USE_LEDS_CLASS
1259 static void rtsx_usb_led_control(struct led_classdev *led,
1260         enum led_brightness brightness)
1261 {
1262         struct rtsx_usb_sdmmc *host = container_of(led,
1263                         struct rtsx_usb_sdmmc, led);
1264
1265         if (host->host_removal)
1266                 return;
1267
1268         host->led.brightness = brightness;
1269         schedule_work(&host->led_work);
1270 }
1271
1272 static void rtsx_usb_update_led(struct work_struct *work)
1273 {
1274         struct rtsx_usb_sdmmc *host =
1275                 container_of(work, struct rtsx_usb_sdmmc, led_work);
1276         struct rtsx_ucr *ucr = host->ucr;
1277
1278         pm_runtime_get_noresume(sdmmc_dev(host));
1279         mutex_lock(&ucr->dev_mutex);
1280
1281         if (host->power_mode == MMC_POWER_OFF)
1282                 goto out;
1283
1284         if (host->led.brightness == LED_OFF)
1285                 rtsx_usb_turn_off_led(ucr);
1286         else
1287                 rtsx_usb_turn_on_led(ucr);
1288
1289 out:
1290         mutex_unlock(&ucr->dev_mutex);
1291         pm_runtime_put_sync_suspend(sdmmc_dev(host));
1292 }
1293 #endif
1294
1295 static void rtsx_usb_init_host(struct rtsx_usb_sdmmc *host)
1296 {
1297         struct mmc_host *mmc = host->mmc;
1298
1299         mmc->f_min = 250000;
1300         mmc->f_max = 208000000;
1301         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
1302         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED |
1303                 MMC_CAP_MMC_HIGHSPEED | MMC_CAP_BUS_WIDTH_TEST |
1304                 MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | MMC_CAP_UHS_SDR50 |
1305                 MMC_CAP_SYNC_RUNTIME_PM;
1306         mmc->caps2 = MMC_CAP2_NO_PRESCAN_POWERUP | MMC_CAP2_FULL_PWR_CYCLE |
1307                 MMC_CAP2_NO_SDIO;
1308
1309         mmc->max_current_330 = 400;
1310         mmc->max_current_180 = 800;
1311         mmc->ops = &rtsx_usb_sdmmc_ops;
1312         mmc->max_segs = 256;
1313         mmc->max_seg_size = 65536;
1314         mmc->max_blk_size = 512;
1315         mmc->max_blk_count = 65535;
1316         mmc->max_req_size = 524288;
1317
1318         host->power_mode = MMC_POWER_OFF;
1319 }
1320
1321 static int rtsx_usb_sdmmc_drv_probe(struct platform_device *pdev)
1322 {
1323         struct mmc_host *mmc;
1324         struct rtsx_usb_sdmmc *host;
1325         struct rtsx_ucr *ucr;
1326 #ifdef RTSX_USB_USE_LEDS_CLASS
1327         int err;
1328 #endif
1329         int ret;
1330
1331         ucr = usb_get_intfdata(to_usb_interface(pdev->dev.parent));
1332         if (!ucr)
1333                 return -ENXIO;
1334
1335         dev_dbg(&(pdev->dev), ": Realtek USB SD/MMC controller found\n");
1336
1337         mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
1338         if (!mmc)
1339                 return -ENOMEM;
1340
1341         host = mmc_priv(mmc);
1342         host->ucr = ucr;
1343         host->mmc = mmc;
1344         host->pdev = pdev;
1345         platform_set_drvdata(pdev, host);
1346
1347         mutex_init(&host->host_mutex);
1348         rtsx_usb_init_host(host);
1349         pm_runtime_enable(&pdev->dev);
1350
1351 #ifdef RTSX_USB_USE_LEDS_CLASS
1352         snprintf(host->led_name, sizeof(host->led_name),
1353                 "%s::", mmc_hostname(mmc));
1354         host->led.name = host->led_name;
1355         host->led.brightness = LED_OFF;
1356         host->led.default_trigger = mmc_hostname(mmc);
1357         host->led.brightness_set = rtsx_usb_led_control;
1358
1359         err = led_classdev_register(mmc_dev(mmc), &host->led);
1360         if (err)
1361                 dev_err(&(pdev->dev),
1362                                 "Failed to register LED device: %d\n", err);
1363         INIT_WORK(&host->led_work, rtsx_usb_update_led);
1364
1365 #endif
1366         ret = mmc_add_host(mmc);
1367         if (ret) {
1368 #ifdef RTSX_USB_USE_LEDS_CLASS
1369                 led_classdev_unregister(&host->led);
1370 #endif
1371                 mmc_free_host(mmc);
1372                 pm_runtime_disable(&pdev->dev);
1373                 return ret;
1374         }
1375
1376         return 0;
1377 }
1378
1379 static void rtsx_usb_sdmmc_drv_remove(struct platform_device *pdev)
1380 {
1381         struct rtsx_usb_sdmmc *host = platform_get_drvdata(pdev);
1382         struct mmc_host *mmc;
1383
1384         if (!host)
1385                 return;
1386
1387         mmc = host->mmc;
1388         host->host_removal = true;
1389
1390         mutex_lock(&host->host_mutex);
1391         if (host->mrq) {
1392                 dev_dbg(&(pdev->dev),
1393                         "%s: Controller removed during transfer\n",
1394                         mmc_hostname(mmc));
1395                 host->mrq->cmd->error = -ENOMEDIUM;
1396                 if (host->mrq->stop)
1397                         host->mrq->stop->error = -ENOMEDIUM;
1398                 mmc_request_done(mmc, host->mrq);
1399         }
1400         mutex_unlock(&host->host_mutex);
1401
1402         mmc_remove_host(mmc);
1403
1404 #ifdef RTSX_USB_USE_LEDS_CLASS
1405         cancel_work_sync(&host->led_work);
1406         led_classdev_unregister(&host->led);
1407 #endif
1408
1409         mmc_free_host(mmc);
1410         pm_runtime_disable(&pdev->dev);
1411         platform_set_drvdata(pdev, NULL);
1412
1413         dev_dbg(&(pdev->dev),
1414                 ": Realtek USB SD/MMC module has been removed\n");
1415 }
1416
1417 #ifdef CONFIG_PM
1418 static int rtsx_usb_sdmmc_runtime_suspend(struct device *dev)
1419 {
1420         struct rtsx_usb_sdmmc *host = dev_get_drvdata(dev);
1421
1422         host->mmc->caps &= ~MMC_CAP_NEEDS_POLL;
1423         return 0;
1424 }
1425
1426 static int rtsx_usb_sdmmc_runtime_resume(struct device *dev)
1427 {
1428         struct rtsx_usb_sdmmc *host = dev_get_drvdata(dev);
1429
1430         host->mmc->caps |= MMC_CAP_NEEDS_POLL;
1431         if (sdmmc_get_cd(host->mmc) == 1)
1432                 mmc_detect_change(host->mmc, 0);
1433         return 0;
1434 }
1435 #endif
1436
1437 static const struct dev_pm_ops rtsx_usb_sdmmc_dev_pm_ops = {
1438         SET_RUNTIME_PM_OPS(rtsx_usb_sdmmc_runtime_suspend,
1439                            rtsx_usb_sdmmc_runtime_resume, NULL)
1440 };
1441
1442 static const struct platform_device_id rtsx_usb_sdmmc_ids[] = {
1443         {
1444                 .name = "rtsx_usb_sdmmc",
1445         }, {
1446                 /* sentinel */
1447         }
1448 };
1449 MODULE_DEVICE_TABLE(platform, rtsx_usb_sdmmc_ids);
1450
1451 static struct platform_driver rtsx_usb_sdmmc_driver = {
1452         .probe          = rtsx_usb_sdmmc_drv_probe,
1453         .remove         = rtsx_usb_sdmmc_drv_remove,
1454         .id_table       = rtsx_usb_sdmmc_ids,
1455         .driver         = {
1456                 .name   = "rtsx_usb_sdmmc",
1457                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1458                 .pm     = &rtsx_usb_sdmmc_dev_pm_ops,
1459         },
1460 };
1461 module_platform_driver(rtsx_usb_sdmmc_driver);
1462
1463 MODULE_LICENSE("GPL v2");
1464 MODULE_AUTHOR("Roger Tseng <[email protected]>");
1465 MODULE_DESCRIPTION("Realtek USB SD/MMC Card Host Driver");
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