xref: /linux/drivers/mmc/host/rtsx_usb_sdmmc.c (revision fcb3ad4366b9c810cbb9da34c076a9a52d8aa1e0)
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 <rogerable@realtek.com>
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_R1_NO_CRC:
317 		rsp_type = SD_RSP_TYPE_R1 | SD_NO_CHECK_CRC7;
318 		break;
319 	case MMC_RSP_R1B:
320 		rsp_type = SD_RSP_TYPE_R1b;
321 		break;
322 	case MMC_RSP_R2:
323 		rsp_type = SD_RSP_TYPE_R2;
324 		break;
325 	case MMC_RSP_R3:
326 		rsp_type = SD_RSP_TYPE_R3;
327 		break;
328 	default:
329 		dev_dbg(sdmmc_dev(host), "cmd->flag is not valid\n");
330 		err = -EINVAL;
331 		goto out;
332 	}
333 
334 	if (rsp_type == SD_RSP_TYPE_R1b)
335 		timeout = cmd->busy_timeout ? cmd->busy_timeout : 3000;
336 
337 	if (cmd->opcode == SD_SWITCH_VOLTAGE) {
338 		err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
339 				SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
340 				SD_CLK_TOGGLE_EN);
341 		if (err)
342 			goto out;
343 	}
344 
345 	rtsx_usb_init_cmd(ucr);
346 
347 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD0, 0xFF, 0x40 | cmd_idx);
348 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD1, 0xFF, (u8)(arg >> 24));
349 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD2, 0xFF, (u8)(arg >> 16));
350 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD3, 0xFF, (u8)(arg >> 8));
351 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD4, 0xFF, (u8)arg);
352 
353 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF, rsp_type);
354 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
355 			0x01, PINGPONG_BUFFER);
356 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER,
357 			0xFF, SD_TM_CMD_RSP | SD_TRANSFER_START);
358 	rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
359 		     SD_TRANSFER_END | SD_STAT_IDLE,
360 		     SD_TRANSFER_END | SD_STAT_IDLE);
361 
362 	if (rsp_type == SD_RSP_TYPE_R2) {
363 		/* Read data from ping-pong buffer */
364 		for (i = PPBUF_BASE2; i < PPBUF_BASE2 + 16; i++)
365 			rtsx_usb_add_cmd(ucr, READ_REG_CMD, (u16)i, 0, 0);
366 		stat_idx = 16;
367 	} else if (rsp_type != SD_RSP_TYPE_R0) {
368 		/* Read data from SD_CMDx registers */
369 		for (i = SD_CMD0; i <= SD_CMD4; i++)
370 			rtsx_usb_add_cmd(ucr, READ_REG_CMD, (u16)i, 0, 0);
371 		stat_idx = 5;
372 	}
373 	len += stat_idx;
374 
375 	rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_STAT1, 0, 0);
376 
377 	err = rtsx_usb_send_cmd(ucr, MODE_CR, 100);
378 	if (err) {
379 		dev_dbg(sdmmc_dev(host),
380 			"rtsx_usb_send_cmd error (err = %d)\n", err);
381 		goto out;
382 	}
383 
384 	err = rtsx_usb_get_rsp(ucr, len, timeout);
385 	if (err || (ucr->rsp_buf[0] & SD_TRANSFER_ERR)) {
386 		sd_print_debug_regs(host);
387 		sd_clear_error(host);
388 
389 		if (!err) {
390 			dev_dbg(sdmmc_dev(host),
391 				"Transfer failed (SD_TRANSFER = %02x)\n",
392 					ucr->rsp_buf[0]);
393 			err = -EIO;
394 		} else {
395 			dev_dbg(sdmmc_dev(host),
396 				"rtsx_usb_get_rsp failed (err = %d)\n", err);
397 		}
398 
399 		goto out;
400 	}
401 
402 	if (rsp_type == SD_RSP_TYPE_R0) {
403 		err = 0;
404 		goto out;
405 	}
406 
407 	/* Skip result of CHECK_REG_CMD */
408 	ptr = ucr->rsp_buf + 1;
409 
410 	/* Check (Start,Transmission) bit of Response */
411 	if ((ptr[0] & 0xC0) != 0) {
412 		err = -EILSEQ;
413 		dev_dbg(sdmmc_dev(host), "Invalid response bit\n");
414 		goto out;
415 	}
416 
417 	/* Check CRC7 */
418 	if (!(rsp_type & SD_NO_CHECK_CRC7)) {
419 		if (ptr[stat_idx] & SD_CRC7_ERR) {
420 			err = -EILSEQ;
421 			dev_dbg(sdmmc_dev(host), "CRC7 error\n");
422 			goto out;
423 		}
424 	}
425 
426 	if (rsp_type == SD_RSP_TYPE_R2) {
427 		/*
428 		 * The controller offloads the last byte {CRC-7, end bit 1'b1}
429 		 * of response type R2. Assign dummy CRC, 0, and end bit to the
430 		 * byte(ptr[16], goes into the LSB of resp[3] later).
431 		 */
432 		ptr[16] = 1;
433 
434 		for (i = 0; i < 4; i++) {
435 			cmd->resp[i] = get_unaligned_be32(ptr + 1 + i * 4);
436 			dev_dbg(sdmmc_dev(host), "cmd->resp[%d] = 0x%08x\n",
437 					i, cmd->resp[i]);
438 		}
439 	} else {
440 		cmd->resp[0] = get_unaligned_be32(ptr + 1);
441 		dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
442 				cmd->resp[0]);
443 	}
444 
445 out:
446 	cmd->error = err;
447 }
448 
449 static int sd_rw_multi(struct rtsx_usb_sdmmc *host, struct mmc_request *mrq)
450 {
451 	struct rtsx_ucr *ucr = host->ucr;
452 	struct mmc_data *data = mrq->data;
453 	int read = (data->flags & MMC_DATA_READ) ? 1 : 0;
454 	u8 cfg2, trans_mode;
455 	int err;
456 	u8 flag;
457 	size_t data_len = data->blksz * data->blocks;
458 	unsigned int pipe;
459 
460 	if (read) {
461 		dev_dbg(sdmmc_dev(host), "%s: read %zu bytes\n",
462 				__func__, data_len);
463 		cfg2 = SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
464 			SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_0;
465 		trans_mode = SD_TM_AUTO_READ_3;
466 	} else {
467 		dev_dbg(sdmmc_dev(host), "%s: write %zu bytes\n",
468 				__func__, data_len);
469 		cfg2 = SD_NO_CALCULATE_CRC7 | SD_CHECK_CRC16 |
470 			SD_NO_WAIT_BUSY_END | SD_NO_CHECK_CRC7 | SD_RSP_LEN_0;
471 		trans_mode = SD_TM_AUTO_WRITE_3;
472 	}
473 
474 	rtsx_usb_init_cmd(ucr);
475 
476 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, 0x00);
477 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H, 0xFF, 0x02);
478 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L,
479 			0xFF, (u8)data->blocks);
480 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H,
481 			0xFF, (u8)(data->blocks >> 8));
482 
483 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
484 			0x01, RING_BUFFER);
485 
486 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC3,
487 			0xFF, (u8)(data_len >> 24));
488 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC2,
489 			0xFF, (u8)(data_len >> 16));
490 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC1,
491 			0xFF, (u8)(data_len >> 8));
492 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC0,
493 			0xFF, (u8)data_len);
494 	if (read) {
495 		flag = MODE_CDIR;
496 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_CTL,
497 				0x03 | DMA_PACK_SIZE_MASK,
498 				DMA_DIR_FROM_CARD | DMA_EN | DMA_512);
499 	} else {
500 		flag = MODE_CDOR;
501 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_CTL,
502 				0x03 | DMA_PACK_SIZE_MASK,
503 				DMA_DIR_TO_CARD | DMA_EN | DMA_512);
504 	}
505 
506 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2);
507 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
508 			trans_mode | SD_TRANSFER_START);
509 	rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
510 			SD_TRANSFER_END, SD_TRANSFER_END);
511 
512 	err = rtsx_usb_send_cmd(ucr, flag, 100);
513 	if (err)
514 		return err;
515 
516 	if (read)
517 		pipe = usb_rcvbulkpipe(ucr->pusb_dev, EP_BULK_IN);
518 	else
519 		pipe = usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT);
520 
521 	err = rtsx_usb_transfer_data(ucr, pipe, data->sg, data_len,
522 			data->sg_len,  NULL, 10000);
523 	if (err) {
524 		dev_dbg(sdmmc_dev(host), "rtsx_usb_transfer_data error %d\n"
525 				, err);
526 		sd_clear_error(host);
527 		return err;
528 	}
529 
530 	return rtsx_usb_get_rsp(ucr, 1, 2000);
531 }
532 
533 static inline void sd_enable_initial_mode(struct rtsx_usb_sdmmc *host)
534 {
535 	rtsx_usb_write_register(host->ucr, SD_CFG1,
536 			SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_128);
537 }
538 
539 static inline void sd_disable_initial_mode(struct rtsx_usb_sdmmc *host)
540 {
541 	rtsx_usb_write_register(host->ucr, SD_CFG1,
542 			SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_0);
543 }
544 
545 static void sd_normal_rw(struct rtsx_usb_sdmmc *host,
546 		struct mmc_request *mrq)
547 {
548 	struct mmc_command *cmd = mrq->cmd;
549 	struct mmc_data *data = mrq->data;
550 	u8 *buf;
551 
552 	buf = kzalloc(data->blksz, GFP_NOIO);
553 	if (!buf) {
554 		cmd->error = -ENOMEM;
555 		return;
556 	}
557 
558 	if (data->flags & MMC_DATA_READ) {
559 		if (host->initial_mode)
560 			sd_disable_initial_mode(host);
561 
562 		cmd->error = sd_read_data(host, cmd, (u16)data->blksz, buf,
563 				data->blksz, 200);
564 
565 		if (host->initial_mode)
566 			sd_enable_initial_mode(host);
567 
568 		sg_copy_from_buffer(data->sg, data->sg_len, buf, data->blksz);
569 	} else {
570 		sg_copy_to_buffer(data->sg, data->sg_len, buf, data->blksz);
571 
572 		cmd->error = sd_write_data(host, cmd, (u16)data->blksz, buf,
573 				data->blksz, 200);
574 	}
575 
576 	kfree(buf);
577 }
578 
579 static int sd_change_phase(struct rtsx_usb_sdmmc *host, u8 sample_point, int tx)
580 {
581 	struct rtsx_ucr *ucr = host->ucr;
582 
583 	dev_dbg(sdmmc_dev(host), "%s: %s sample_point = %d\n",
584 			__func__, tx ? "TX" : "RX", sample_point);
585 
586 	rtsx_usb_init_cmd(ucr);
587 
588 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, CLK_CHANGE);
589 
590 	if (tx)
591 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
592 				0x0F, sample_point);
593 	else
594 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK1_CTL,
595 				0x0F, sample_point);
596 
597 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL, PHASE_NOT_RESET, 0);
598 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
599 			PHASE_NOT_RESET, PHASE_NOT_RESET);
600 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, 0);
601 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1, SD_ASYNC_FIFO_RST, 0);
602 
603 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
604 }
605 
606 static inline u32 get_phase_point(u32 phase_map, unsigned int idx)
607 {
608 	idx &= MAX_PHASE;
609 	return phase_map & (1 << idx);
610 }
611 
612 static int get_phase_len(u32 phase_map, unsigned int idx)
613 {
614 	int i;
615 
616 	for (i = 0; i < MAX_PHASE + 1; i++) {
617 		if (get_phase_point(phase_map, idx + i) == 0)
618 			return i;
619 	}
620 	return MAX_PHASE + 1;
621 }
622 
623 static u8 sd_search_final_phase(struct rtsx_usb_sdmmc *host, u32 phase_map)
624 {
625 	int start = 0, len = 0;
626 	int start_final = 0, len_final = 0;
627 	u8 final_phase = 0xFF;
628 
629 	if (phase_map == 0) {
630 		dev_dbg(sdmmc_dev(host), "Phase: [map:%x]\n", phase_map);
631 		return final_phase;
632 	}
633 
634 	while (start < MAX_PHASE + 1) {
635 		len = get_phase_len(phase_map, start);
636 		if (len_final < len) {
637 			start_final = start;
638 			len_final = len;
639 		}
640 		start += len ? len : 1;
641 	}
642 
643 	final_phase = (start_final + len_final / 2) & MAX_PHASE;
644 	dev_dbg(sdmmc_dev(host), "Phase: [map:%x] [maxlen:%d] [final:%d]\n",
645 		phase_map, len_final, final_phase);
646 
647 	return final_phase;
648 }
649 
650 static void sd_wait_data_idle(struct rtsx_usb_sdmmc *host)
651 {
652 	int i;
653 	u8 val = 0;
654 
655 	for (i = 0; i < 100; i++) {
656 		rtsx_usb_ep0_read_register(host->ucr, SD_DATA_STATE, &val);
657 		if (val & SD_DATA_IDLE)
658 			return;
659 
660 		usleep_range(100, 1000);
661 	}
662 }
663 
664 static int sd_tuning_rx_cmd(struct rtsx_usb_sdmmc *host,
665 		u8 opcode, u8 sample_point)
666 {
667 	int err;
668 	struct mmc_command cmd = {};
669 
670 	err = sd_change_phase(host, sample_point, 0);
671 	if (err)
672 		return err;
673 
674 	cmd.opcode = MMC_SEND_TUNING_BLOCK;
675 	err = sd_read_data(host, &cmd, 0x40, NULL, 0, 100);
676 	if (err) {
677 		/* Wait till SD DATA IDLE */
678 		sd_wait_data_idle(host);
679 		sd_clear_error(host);
680 		return err;
681 	}
682 
683 	return 0;
684 }
685 
686 static void sd_tuning_phase(struct rtsx_usb_sdmmc *host,
687 		u8 opcode, u16 *phase_map)
688 {
689 	int err, i;
690 	u16 raw_phase_map = 0;
691 
692 	for (i = MAX_PHASE; i >= 0; i--) {
693 		err = sd_tuning_rx_cmd(host, opcode, (u8)i);
694 		if (!err)
695 			raw_phase_map |= 1 << i;
696 	}
697 
698 	if (phase_map)
699 		*phase_map = raw_phase_map;
700 }
701 
702 static int sd_tuning_rx(struct rtsx_usb_sdmmc *host, u8 opcode)
703 {
704 	int err, i;
705 	u16 raw_phase_map[RX_TUNING_CNT] = {0}, phase_map;
706 	u8 final_phase;
707 
708 	/* setting fixed default TX phase */
709 	err = sd_change_phase(host, 0x01, 1);
710 	if (err) {
711 		dev_dbg(sdmmc_dev(host), "TX phase setting failed\n");
712 		return err;
713 	}
714 
715 	/* tuning RX phase */
716 	for (i = 0; i < RX_TUNING_CNT; i++) {
717 		sd_tuning_phase(host, opcode, &(raw_phase_map[i]));
718 
719 		if (raw_phase_map[i] == 0)
720 			break;
721 	}
722 
723 	phase_map = 0xFFFF;
724 	for (i = 0; i < RX_TUNING_CNT; i++) {
725 		dev_dbg(sdmmc_dev(host), "RX raw_phase_map[%d] = 0x%04x\n",
726 				i, raw_phase_map[i]);
727 		phase_map &= raw_phase_map[i];
728 	}
729 	dev_dbg(sdmmc_dev(host), "RX phase_map = 0x%04x\n", phase_map);
730 
731 	if (phase_map) {
732 		final_phase = sd_search_final_phase(host, phase_map);
733 		if (final_phase == 0xFF)
734 			return -EINVAL;
735 
736 		err = sd_change_phase(host, final_phase, 0);
737 		if (err)
738 			return err;
739 	} else {
740 		return -EINVAL;
741 	}
742 
743 	return 0;
744 }
745 
746 static int sdmmc_get_ro(struct mmc_host *mmc)
747 {
748 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
749 	struct rtsx_ucr *ucr = host->ucr;
750 	int err;
751 	u16 val;
752 
753 	if (host->host_removal)
754 		return -ENOMEDIUM;
755 
756 	mutex_lock(&ucr->dev_mutex);
757 
758 	/* Check SD card detect */
759 	err = rtsx_usb_get_card_status(ucr, &val);
760 
761 	mutex_unlock(&ucr->dev_mutex);
762 
763 
764 	/* Treat failed detection as non-ro */
765 	if (err)
766 		return 0;
767 
768 	if (val & SD_WP)
769 		return 1;
770 
771 	return 0;
772 }
773 
774 static int sdmmc_get_cd(struct mmc_host *mmc)
775 {
776 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
777 	struct rtsx_ucr *ucr = host->ucr;
778 	int err;
779 	u16 val;
780 
781 	if (host->host_removal)
782 		return -ENOMEDIUM;
783 
784 	mutex_lock(&ucr->dev_mutex);
785 
786 	/* Check SD card detect */
787 	err = rtsx_usb_get_card_status(ucr, &val);
788 
789 	mutex_unlock(&ucr->dev_mutex);
790 
791 	/* Treat failed detection as non-exist */
792 	if (err)
793 		goto no_card;
794 
795 	if (val & SD_CD) {
796 		host->card_exist = true;
797 		return 1;
798 	}
799 
800 no_card:
801 	host->card_exist = false;
802 	return 0;
803 }
804 
805 static void sdmmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
806 {
807 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
808 	struct rtsx_ucr *ucr = host->ucr;
809 	struct mmc_command *cmd = mrq->cmd;
810 	struct mmc_data *data = mrq->data;
811 	unsigned int data_size = 0;
812 
813 	dev_dbg(sdmmc_dev(host), "%s\n", __func__);
814 
815 	if (host->host_removal) {
816 		cmd->error = -ENOMEDIUM;
817 		goto finish;
818 	}
819 
820 	if ((!host->card_exist)) {
821 		cmd->error = -ENOMEDIUM;
822 		goto finish_detect_card;
823 	}
824 
825 	mutex_lock(&ucr->dev_mutex);
826 
827 	mutex_lock(&host->host_mutex);
828 	host->mrq = mrq;
829 	mutex_unlock(&host->host_mutex);
830 
831 	if (mrq->data)
832 		data_size = data->blocks * data->blksz;
833 
834 	if (!data_size) {
835 		sd_send_cmd_get_rsp(host, cmd);
836 	} else if ((!(data_size % 512) && cmd->opcode != MMC_SEND_EXT_CSD) ||
837 		   mmc_op_multi(cmd->opcode)) {
838 		sd_send_cmd_get_rsp(host, cmd);
839 
840 		if (!cmd->error) {
841 			sd_rw_multi(host, mrq);
842 
843 			if (mmc_op_multi(cmd->opcode) && mrq->stop) {
844 				sd_send_cmd_get_rsp(host, mrq->stop);
845 				rtsx_usb_write_register(ucr, MC_FIFO_CTL,
846 						FIFO_FLUSH, FIFO_FLUSH);
847 			}
848 		}
849 	} else {
850 		sd_normal_rw(host, mrq);
851 	}
852 
853 	if (mrq->data) {
854 		if (cmd->error || data->error)
855 			data->bytes_xfered = 0;
856 		else
857 			data->bytes_xfered = data->blocks * data->blksz;
858 	}
859 
860 	mutex_unlock(&ucr->dev_mutex);
861 
862 finish_detect_card:
863 	if (cmd->error) {
864 		/*
865 		 * detect card when fail to update card existence state and
866 		 * speed up card removal when retry
867 		 */
868 		sdmmc_get_cd(mmc);
869 		dev_dbg(sdmmc_dev(host), "cmd->error = %d\n", cmd->error);
870 	}
871 
872 finish:
873 	mutex_lock(&host->host_mutex);
874 	host->mrq = NULL;
875 	mutex_unlock(&host->host_mutex);
876 
877 	mmc_request_done(mmc, mrq);
878 }
879 
880 static int sd_set_bus_width(struct rtsx_usb_sdmmc *host,
881 		unsigned char bus_width)
882 {
883 	int err = 0;
884 	static const u8 width[] = {
885 		[MMC_BUS_WIDTH_1] = SD_BUS_WIDTH_1BIT,
886 		[MMC_BUS_WIDTH_4] = SD_BUS_WIDTH_4BIT,
887 		[MMC_BUS_WIDTH_8] = SD_BUS_WIDTH_8BIT,
888 	};
889 
890 	if (bus_width <= MMC_BUS_WIDTH_8)
891 		err = rtsx_usb_write_register(host->ucr, SD_CFG1,
892 				0x03, width[bus_width]);
893 
894 	return err;
895 }
896 
897 static int sd_pull_ctl_disable_lqfp48(struct rtsx_ucr *ucr)
898 {
899 	rtsx_usb_init_cmd(ucr);
900 
901 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x55);
902 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
903 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
904 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
905 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
906 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0xA5);
907 
908 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
909 }
910 
911 static int sd_pull_ctl_disable_qfn24(struct rtsx_ucr *ucr)
912 {
913 	rtsx_usb_init_cmd(ucr);
914 
915 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x65);
916 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
917 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
918 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
919 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x56);
920 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x59);
921 
922 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
923 }
924 
925 static int sd_pull_ctl_enable_lqfp48(struct rtsx_ucr *ucr)
926 {
927 	rtsx_usb_init_cmd(ucr);
928 
929 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0xAA);
930 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0xAA);
931 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0xA9);
932 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
933 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
934 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0xA5);
935 
936 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
937 }
938 
939 static int sd_pull_ctl_enable_qfn24(struct rtsx_ucr *ucr)
940 {
941 	rtsx_usb_init_cmd(ucr);
942 
943 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0xA5);
944 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x9A);
945 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0xA5);
946 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x9A);
947 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x65);
948 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x5A);
949 
950 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
951 }
952 
953 static int sd_power_on(struct rtsx_usb_sdmmc *host)
954 {
955 	struct rtsx_ucr *ucr = host->ucr;
956 	int err;
957 
958 	dev_dbg(sdmmc_dev(host), "%s\n", __func__);
959 	rtsx_usb_init_cmd(ucr);
960 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SELECT, 0x07, SD_MOD_SEL);
961 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SHARE_MODE,
962 			CARD_SHARE_MASK, CARD_SHARE_SD);
963 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN,
964 			SD_CLK_EN, SD_CLK_EN);
965 	err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
966 	if (err)
967 		return err;
968 
969 	if (CHECK_PKG(ucr, LQFP48))
970 		err = sd_pull_ctl_enable_lqfp48(ucr);
971 	else
972 		err = sd_pull_ctl_enable_qfn24(ucr);
973 	if (err)
974 		return err;
975 
976 	err = rtsx_usb_write_register(ucr, CARD_PWR_CTL,
977 			POWER_MASK, PARTIAL_POWER_ON);
978 	if (err)
979 		return err;
980 
981 	usleep_range(800, 1000);
982 
983 	rtsx_usb_init_cmd(ucr);
984 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
985 			POWER_MASK|LDO3318_PWR_MASK, POWER_ON|LDO_ON);
986 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE,
987 			SD_OUTPUT_EN, SD_OUTPUT_EN);
988 
989 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
990 }
991 
992 static int sd_power_off(struct rtsx_usb_sdmmc *host)
993 {
994 	struct rtsx_ucr *ucr = host->ucr;
995 	int err;
996 
997 	dev_dbg(sdmmc_dev(host), "%s\n", __func__);
998 	rtsx_usb_init_cmd(ucr);
999 
1000 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN, SD_CLK_EN, 0);
1001 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE, SD_OUTPUT_EN, 0);
1002 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
1003 			POWER_MASK, POWER_OFF);
1004 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
1005 			POWER_MASK|LDO3318_PWR_MASK, POWER_OFF|LDO_SUSPEND);
1006 
1007 	err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
1008 	if (err)
1009 		return err;
1010 
1011 	if (CHECK_PKG(ucr, LQFP48))
1012 			return sd_pull_ctl_disable_lqfp48(ucr);
1013 	return sd_pull_ctl_disable_qfn24(ucr);
1014 }
1015 
1016 static int sd_set_power_mode(struct rtsx_usb_sdmmc *host,
1017 		unsigned char power_mode)
1018 {
1019 	int err;
1020 
1021 	if (power_mode != MMC_POWER_OFF)
1022 		power_mode = MMC_POWER_ON;
1023 
1024 	if (power_mode == host->power_mode)
1025 		return 0;
1026 
1027 	if (power_mode == MMC_POWER_OFF) {
1028 		err = sd_power_off(host);
1029 		pm_runtime_put_noidle(sdmmc_dev(host));
1030 	} else {
1031 		pm_runtime_get_noresume(sdmmc_dev(host));
1032 		err = sd_power_on(host);
1033 	}
1034 
1035 	if (!err)
1036 		host->power_mode = power_mode;
1037 
1038 	return err;
1039 }
1040 
1041 static int sd_set_timing(struct rtsx_usb_sdmmc *host,
1042 		unsigned char timing, bool *ddr_mode)
1043 {
1044 	struct rtsx_ucr *ucr = host->ucr;
1045 
1046 	*ddr_mode = false;
1047 
1048 	rtsx_usb_init_cmd(ucr);
1049 
1050 	switch (timing) {
1051 	case MMC_TIMING_UHS_SDR104:
1052 	case MMC_TIMING_UHS_SDR50:
1053 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1054 				0x0C | SD_ASYNC_FIFO_RST,
1055 				SD_30_MODE | SD_ASYNC_FIFO_RST);
1056 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1057 				CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
1058 		break;
1059 
1060 	case MMC_TIMING_UHS_DDR50:
1061 		*ddr_mode = true;
1062 
1063 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1064 				0x0C | SD_ASYNC_FIFO_RST,
1065 				SD_DDR_MODE | SD_ASYNC_FIFO_RST);
1066 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1067 				CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
1068 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1069 				DDR_VAR_TX_CMD_DAT, DDR_VAR_TX_CMD_DAT);
1070 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1071 				DDR_VAR_RX_DAT | DDR_VAR_RX_CMD,
1072 				DDR_VAR_RX_DAT | DDR_VAR_RX_CMD);
1073 		break;
1074 
1075 	case MMC_TIMING_MMC_HS:
1076 	case MMC_TIMING_SD_HS:
1077 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1078 				0x0C, SD_20_MODE);
1079 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1080 				CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1081 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1082 				SD20_TX_SEL_MASK, SD20_TX_14_AHEAD);
1083 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1084 				SD20_RX_SEL_MASK, SD20_RX_14_DELAY);
1085 		break;
1086 
1087 	default:
1088 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
1089 				SD_CFG1, 0x0C, SD_20_MODE);
1090 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1091 				CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1092 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
1093 				SD_PUSH_POINT_CTL, 0xFF, 0);
1094 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1095 				SD20_RX_SEL_MASK, SD20_RX_POS_EDGE);
1096 		break;
1097 	}
1098 
1099 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
1100 }
1101 
1102 static void sdmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1103 {
1104 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1105 	struct rtsx_ucr *ucr = host->ucr;
1106 
1107 	dev_dbg(sdmmc_dev(host), "%s\n", __func__);
1108 	mutex_lock(&ucr->dev_mutex);
1109 
1110 	sd_set_power_mode(host, ios->power_mode);
1111 	sd_set_bus_width(host, ios->bus_width);
1112 	sd_set_timing(host, ios->timing, &host->ddr_mode);
1113 
1114 	host->vpclk = false;
1115 	host->double_clk = true;
1116 
1117 	switch (ios->timing) {
1118 	case MMC_TIMING_UHS_SDR104:
1119 	case MMC_TIMING_UHS_SDR50:
1120 		host->ssc_depth = SSC_DEPTH_2M;
1121 		host->vpclk = true;
1122 		host->double_clk = false;
1123 		break;
1124 	case MMC_TIMING_UHS_DDR50:
1125 	case MMC_TIMING_UHS_SDR25:
1126 		host->ssc_depth = SSC_DEPTH_1M;
1127 		break;
1128 	default:
1129 		host->ssc_depth = SSC_DEPTH_512K;
1130 		break;
1131 	}
1132 
1133 	host->initial_mode = (ios->clock <= 1000000) ? true : false;
1134 	host->clock = ios->clock;
1135 
1136 	rtsx_usb_switch_clock(host->ucr, host->clock, host->ssc_depth,
1137 			host->initial_mode, host->double_clk, host->vpclk);
1138 
1139 	mutex_unlock(&ucr->dev_mutex);
1140 	dev_dbg(sdmmc_dev(host), "%s end\n", __func__);
1141 }
1142 
1143 static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1144 {
1145 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1146 	struct rtsx_ucr *ucr = host->ucr;
1147 	int err = 0;
1148 
1149 	dev_dbg(sdmmc_dev(host), "%s: signal_voltage = %d\n",
1150 			__func__, ios->signal_voltage);
1151 
1152 	if (host->host_removal)
1153 		return -ENOMEDIUM;
1154 
1155 	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_120)
1156 		return -EPERM;
1157 
1158 	mutex_lock(&ucr->dev_mutex);
1159 
1160 	err = rtsx_usb_card_exclusive_check(ucr, RTSX_USB_SD_CARD);
1161 	if (err) {
1162 		mutex_unlock(&ucr->dev_mutex);
1163 		return err;
1164 	}
1165 
1166 	/* Let mmc core do the busy checking, simply stop the forced-toggle
1167 	 * clock(while issuing CMD11) and switch voltage.
1168 	 */
1169 	rtsx_usb_init_cmd(ucr);
1170 
1171 	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1172 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PAD_CTL,
1173 				SD_IO_USING_1V8, SD_IO_USING_3V3);
1174 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG,
1175 				TUNE_SD18_MASK, TUNE_SD18_3V3);
1176 	} else {
1177 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BUS_STAT,
1178 				SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
1179 				SD_CLK_FORCE_STOP);
1180 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PAD_CTL,
1181 				SD_IO_USING_1V8, SD_IO_USING_1V8);
1182 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG,
1183 				TUNE_SD18_MASK, TUNE_SD18_1V8);
1184 	}
1185 
1186 	err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
1187 	mutex_unlock(&ucr->dev_mutex);
1188 
1189 	return err;
1190 }
1191 
1192 static int sdmmc_card_busy(struct mmc_host *mmc)
1193 {
1194 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1195 	struct rtsx_ucr *ucr = host->ucr;
1196 	int err;
1197 	u8 stat;
1198 	u8 mask = SD_DAT3_STATUS | SD_DAT2_STATUS | SD_DAT1_STATUS
1199 		| SD_DAT0_STATUS;
1200 
1201 	dev_dbg(sdmmc_dev(host), "%s\n", __func__);
1202 
1203 	mutex_lock(&ucr->dev_mutex);
1204 
1205 	err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
1206 			SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
1207 			SD_CLK_TOGGLE_EN);
1208 	if (err)
1209 		goto out;
1210 
1211 	mdelay(1);
1212 
1213 	err = rtsx_usb_read_register(ucr, SD_BUS_STAT, &stat);
1214 	if (err)
1215 		goto out;
1216 
1217 	err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
1218 			SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
1219 out:
1220 	mutex_unlock(&ucr->dev_mutex);
1221 
1222 	if (err)
1223 		return err;
1224 
1225 	/* check if any pin between dat[0:3] is low */
1226 	if ((stat & mask) != mask)
1227 		return 1;
1228 	else
1229 		return 0;
1230 }
1231 
1232 static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
1233 {
1234 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1235 	struct rtsx_ucr *ucr = host->ucr;
1236 	int err = 0;
1237 
1238 	if (host->host_removal)
1239 		return -ENOMEDIUM;
1240 
1241 	mutex_lock(&ucr->dev_mutex);
1242 
1243 	if (!host->ddr_mode)
1244 		err = sd_tuning_rx(host, MMC_SEND_TUNING_BLOCK);
1245 
1246 	mutex_unlock(&ucr->dev_mutex);
1247 
1248 	return err;
1249 }
1250 
1251 static const struct mmc_host_ops rtsx_usb_sdmmc_ops = {
1252 	.request = sdmmc_request,
1253 	.set_ios = sdmmc_set_ios,
1254 	.get_ro = sdmmc_get_ro,
1255 	.get_cd = sdmmc_get_cd,
1256 	.start_signal_voltage_switch = sdmmc_switch_voltage,
1257 	.card_busy = sdmmc_card_busy,
1258 	.execute_tuning = sdmmc_execute_tuning,
1259 };
1260 
1261 #ifdef RTSX_USB_USE_LEDS_CLASS
1262 static void rtsx_usb_led_control(struct led_classdev *led,
1263 	enum led_brightness brightness)
1264 {
1265 	struct rtsx_usb_sdmmc *host = container_of(led,
1266 			struct rtsx_usb_sdmmc, led);
1267 
1268 	if (host->host_removal)
1269 		return;
1270 
1271 	host->led.brightness = brightness;
1272 	schedule_work(&host->led_work);
1273 }
1274 
1275 static void rtsx_usb_update_led(struct work_struct *work)
1276 {
1277 	struct rtsx_usb_sdmmc *host =
1278 		container_of(work, struct rtsx_usb_sdmmc, led_work);
1279 	struct rtsx_ucr *ucr = host->ucr;
1280 
1281 	pm_runtime_get_noresume(sdmmc_dev(host));
1282 	mutex_lock(&ucr->dev_mutex);
1283 
1284 	if (host->power_mode == MMC_POWER_OFF)
1285 		goto out;
1286 
1287 	if (host->led.brightness == LED_OFF)
1288 		rtsx_usb_turn_off_led(ucr);
1289 	else
1290 		rtsx_usb_turn_on_led(ucr);
1291 
1292 out:
1293 	mutex_unlock(&ucr->dev_mutex);
1294 	pm_runtime_put_sync_suspend(sdmmc_dev(host));
1295 }
1296 #endif
1297 
1298 static void rtsx_usb_init_host(struct rtsx_usb_sdmmc *host)
1299 {
1300 	struct mmc_host *mmc = host->mmc;
1301 
1302 	mmc->f_min = 250000;
1303 	mmc->f_max = 208000000;
1304 	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
1305 	mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED |
1306 		MMC_CAP_MMC_HIGHSPEED | MMC_CAP_BUS_WIDTH_TEST |
1307 		MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | MMC_CAP_UHS_SDR50 |
1308 		MMC_CAP_SYNC_RUNTIME_PM;
1309 	mmc->caps2 = MMC_CAP2_NO_PRESCAN_POWERUP | MMC_CAP2_FULL_PWR_CYCLE |
1310 		MMC_CAP2_NO_SDIO;
1311 
1312 	mmc->max_current_330 = 400;
1313 	mmc->max_current_180 = 800;
1314 	mmc->ops = &rtsx_usb_sdmmc_ops;
1315 	mmc->max_segs = 256;
1316 	mmc->max_seg_size = 65536;
1317 	mmc->max_blk_size = 512;
1318 	mmc->max_blk_count = 65535;
1319 	mmc->max_req_size = 524288;
1320 
1321 	host->power_mode = MMC_POWER_OFF;
1322 }
1323 
1324 static int rtsx_usb_sdmmc_drv_probe(struct platform_device *pdev)
1325 {
1326 	struct mmc_host *mmc;
1327 	struct rtsx_usb_sdmmc *host;
1328 	struct rtsx_ucr *ucr;
1329 #ifdef RTSX_USB_USE_LEDS_CLASS
1330 	int err;
1331 #endif
1332 	int ret;
1333 
1334 	ucr = usb_get_intfdata(to_usb_interface(pdev->dev.parent));
1335 	if (!ucr)
1336 		return -ENXIO;
1337 
1338 	dev_dbg(&(pdev->dev), ": Realtek USB SD/MMC controller found\n");
1339 
1340 	mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
1341 	if (!mmc)
1342 		return -ENOMEM;
1343 
1344 	host = mmc_priv(mmc);
1345 	host->ucr = ucr;
1346 	host->mmc = mmc;
1347 	host->pdev = pdev;
1348 	platform_set_drvdata(pdev, host);
1349 
1350 	mutex_init(&host->host_mutex);
1351 	rtsx_usb_init_host(host);
1352 	pm_runtime_enable(&pdev->dev);
1353 
1354 #ifdef RTSX_USB_USE_LEDS_CLASS
1355 	snprintf(host->led_name, sizeof(host->led_name),
1356 		"%s::", mmc_hostname(mmc));
1357 	host->led.name = host->led_name;
1358 	host->led.brightness = LED_OFF;
1359 	host->led.default_trigger = mmc_hostname(mmc);
1360 	host->led.brightness_set = rtsx_usb_led_control;
1361 
1362 	err = led_classdev_register(mmc_dev(mmc), &host->led);
1363 	if (err)
1364 		dev_err(&(pdev->dev),
1365 				"Failed to register LED device: %d\n", err);
1366 	INIT_WORK(&host->led_work, rtsx_usb_update_led);
1367 
1368 #endif
1369 	ret = mmc_add_host(mmc);
1370 	if (ret) {
1371 #ifdef RTSX_USB_USE_LEDS_CLASS
1372 		led_classdev_unregister(&host->led);
1373 #endif
1374 		mmc_free_host(mmc);
1375 		pm_runtime_disable(&pdev->dev);
1376 		return ret;
1377 	}
1378 
1379 	return 0;
1380 }
1381 
1382 static void rtsx_usb_sdmmc_drv_remove(struct platform_device *pdev)
1383 {
1384 	struct rtsx_usb_sdmmc *host = platform_get_drvdata(pdev);
1385 	struct mmc_host *mmc;
1386 
1387 	if (!host)
1388 		return;
1389 
1390 	mmc = host->mmc;
1391 	host->host_removal = true;
1392 
1393 	mutex_lock(&host->host_mutex);
1394 	if (host->mrq) {
1395 		dev_dbg(&(pdev->dev),
1396 			"%s: Controller removed during transfer\n",
1397 			mmc_hostname(mmc));
1398 		host->mrq->cmd->error = -ENOMEDIUM;
1399 		if (host->mrq->stop)
1400 			host->mrq->stop->error = -ENOMEDIUM;
1401 		mmc_request_done(mmc, host->mrq);
1402 	}
1403 	mutex_unlock(&host->host_mutex);
1404 
1405 	mmc_remove_host(mmc);
1406 
1407 #ifdef RTSX_USB_USE_LEDS_CLASS
1408 	cancel_work_sync(&host->led_work);
1409 	led_classdev_unregister(&host->led);
1410 #endif
1411 
1412 	mmc_free_host(mmc);
1413 	pm_runtime_disable(&pdev->dev);
1414 	platform_set_drvdata(pdev, NULL);
1415 
1416 	dev_dbg(&(pdev->dev),
1417 		": Realtek USB SD/MMC module has been removed\n");
1418 }
1419 
1420 #ifdef CONFIG_PM
1421 static int rtsx_usb_sdmmc_runtime_suspend(struct device *dev)
1422 {
1423 	struct rtsx_usb_sdmmc *host = dev_get_drvdata(dev);
1424 
1425 	host->mmc->caps &= ~MMC_CAP_NEEDS_POLL;
1426 	return 0;
1427 }
1428 
1429 static int rtsx_usb_sdmmc_runtime_resume(struct device *dev)
1430 {
1431 	struct rtsx_usb_sdmmc *host = dev_get_drvdata(dev);
1432 
1433 	host->mmc->caps |= MMC_CAP_NEEDS_POLL;
1434 	if (sdmmc_get_cd(host->mmc) == 1)
1435 		mmc_detect_change(host->mmc, 0);
1436 	return 0;
1437 }
1438 #endif
1439 
1440 static const struct dev_pm_ops rtsx_usb_sdmmc_dev_pm_ops = {
1441 	SET_RUNTIME_PM_OPS(rtsx_usb_sdmmc_runtime_suspend,
1442 			   rtsx_usb_sdmmc_runtime_resume, NULL)
1443 };
1444 
1445 static const struct platform_device_id rtsx_usb_sdmmc_ids[] = {
1446 	{
1447 		.name = "rtsx_usb_sdmmc",
1448 	}, {
1449 		/* sentinel */
1450 	}
1451 };
1452 MODULE_DEVICE_TABLE(platform, rtsx_usb_sdmmc_ids);
1453 
1454 static struct platform_driver rtsx_usb_sdmmc_driver = {
1455 	.probe		= rtsx_usb_sdmmc_drv_probe,
1456 	.remove		= rtsx_usb_sdmmc_drv_remove,
1457 	.id_table       = rtsx_usb_sdmmc_ids,
1458 	.driver		= {
1459 		.name	= "rtsx_usb_sdmmc",
1460 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1461 		.pm	= &rtsx_usb_sdmmc_dev_pm_ops,
1462 	},
1463 };
1464 module_platform_driver(rtsx_usb_sdmmc_driver);
1465 
1466 MODULE_LICENSE("GPL v2");
1467 MODULE_AUTHOR("Roger Tseng <rogerable@realtek.com>");
1468 MODULE_DESCRIPTION("Realtek USB SD/MMC Card Host Driver");
1469