1 /* Realtek USB SD/MMC Card Interface driver
2  *
3  * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2
7  * as published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License along
15  * with this program; if not, see <http://www.gnu.org/licenses/>.
16  *
17  * Author:
18  *   Roger Tseng <rogerable@realtek.com>
19  */
20 
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/delay.h>
24 #include <linux/platform_device.h>
25 #include <linux/usb.h>
26 #include <linux/mmc/host.h>
27 #include <linux/mmc/mmc.h>
28 #include <linux/mmc/sd.h>
29 #include <linux/mmc/sdio.h>
30 #include <linux/mmc/card.h>
31 #include <linux/scatterlist.h>
32 #include <linux/pm_runtime.h>
33 
34 #include <linux/mfd/rtsx_usb.h>
35 #include <asm/unaligned.h>
36 
37 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
38 		defined(CONFIG_MMC_REALTEK_USB_MODULE))
39 #include <linux/leds.h>
40 #include <linux/workqueue.h>
41 #define RTSX_USB_USE_LEDS_CLASS
42 #endif
43 
44 struct rtsx_usb_sdmmc {
45 	struct platform_device	*pdev;
46 	struct rtsx_ucr	*ucr;
47 	struct mmc_host		*mmc;
48 	struct mmc_request	*mrq;
49 
50 	struct mutex		host_mutex;
51 
52 	u8			ssc_depth;
53 	unsigned int		clock;
54 	bool			vpclk;
55 	bool			double_clk;
56 	bool			host_removal;
57 	bool			card_exist;
58 	bool			initial_mode;
59 	bool			ddr_mode;
60 
61 	unsigned char		power_mode;
62 
63 #ifdef RTSX_USB_USE_LEDS_CLASS
64 	struct led_classdev	led;
65 	char			led_name[32];
66 	struct work_struct	led_work;
67 #endif
68 };
69 
70 static inline struct device *sdmmc_dev(struct rtsx_usb_sdmmc *host)
71 {
72 	return &(host->pdev->dev);
73 }
74 
75 static inline void sd_clear_error(struct rtsx_usb_sdmmc *host)
76 {
77 	struct rtsx_ucr *ucr = host->ucr;
78 	rtsx_usb_ep0_write_register(ucr, CARD_STOP,
79 				  SD_STOP | SD_CLR_ERR,
80 				  SD_STOP | SD_CLR_ERR);
81 
82 	rtsx_usb_clear_dma_err(ucr);
83 	rtsx_usb_clear_fsm_err(ucr);
84 }
85 
86 #ifdef DEBUG
87 static void sd_print_debug_regs(struct rtsx_usb_sdmmc *host)
88 {
89 	struct rtsx_ucr *ucr = host->ucr;
90 	u8 val = 0;
91 
92 	rtsx_usb_ep0_read_register(ucr, SD_STAT1, &val);
93 	dev_dbg(sdmmc_dev(host), "SD_STAT1: 0x%x\n", val);
94 	rtsx_usb_ep0_read_register(ucr, SD_STAT2, &val);
95 	dev_dbg(sdmmc_dev(host), "SD_STAT2: 0x%x\n", val);
96 	rtsx_usb_ep0_read_register(ucr, SD_BUS_STAT, &val);
97 	dev_dbg(sdmmc_dev(host), "SD_BUS_STAT: 0x%x\n", val);
98 }
99 #else
100 #define sd_print_debug_regs(host)
101 #endif /* DEBUG */
102 
103 static int sd_read_data(struct rtsx_usb_sdmmc *host, struct mmc_command *cmd,
104 	       u16 byte_cnt, u8 *buf, int buf_len, int timeout)
105 {
106 	struct rtsx_ucr *ucr = host->ucr;
107 	int err;
108 	u8 trans_mode;
109 
110 	if (!buf)
111 		buf_len = 0;
112 
113 	rtsx_usb_init_cmd(ucr);
114 	if (cmd != NULL) {
115 		dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD%d\n", __func__
116 				, cmd->opcode);
117 		if (cmd->opcode == MMC_SEND_TUNING_BLOCK)
118 			trans_mode = SD_TM_AUTO_TUNING;
119 		else
120 			trans_mode = SD_TM_NORMAL_READ;
121 
122 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
123 				SD_CMD0, 0xFF, (u8)(cmd->opcode) | 0x40);
124 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
125 				SD_CMD1, 0xFF, (u8)(cmd->arg >> 24));
126 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
127 				SD_CMD2, 0xFF, (u8)(cmd->arg >> 16));
128 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
129 				SD_CMD3, 0xFF, (u8)(cmd->arg >> 8));
130 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
131 				SD_CMD4, 0xFF, (u8)cmd->arg);
132 	} else {
133 		trans_mode = SD_TM_AUTO_READ_3;
134 	}
135 
136 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, (u8)byte_cnt);
137 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H,
138 			0xFF, (u8)(byte_cnt >> 8));
139 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L, 0xFF, 1);
140 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H, 0xFF, 0);
141 
142 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF,
143 			SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
144 			SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_6);
145 	if (trans_mode != SD_TM_AUTO_TUNING)
146 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
147 				CARD_DATA_SOURCE, 0x01, PINGPONG_BUFFER);
148 
149 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER,
150 			0xFF, trans_mode | SD_TRANSFER_START);
151 	rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
152 			SD_TRANSFER_END, SD_TRANSFER_END);
153 
154 	if (cmd != NULL) {
155 		rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD1, 0, 0);
156 		rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD2, 0, 0);
157 		rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD3, 0, 0);
158 		rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD4, 0, 0);
159 	}
160 
161 	err = rtsx_usb_send_cmd(ucr, MODE_CR, timeout);
162 	if (err) {
163 		dev_dbg(sdmmc_dev(host),
164 			"rtsx_usb_send_cmd failed (err = %d)\n", err);
165 		return err;
166 	}
167 
168 	err = rtsx_usb_get_rsp(ucr, !cmd ? 1 : 5, timeout);
169 	if (err || (ucr->rsp_buf[0] & SD_TRANSFER_ERR)) {
170 		sd_print_debug_regs(host);
171 
172 		if (!err) {
173 			dev_dbg(sdmmc_dev(host),
174 				"Transfer failed (SD_TRANSFER = %02x)\n",
175 				ucr->rsp_buf[0]);
176 			err = -EIO;
177 		} else {
178 			dev_dbg(sdmmc_dev(host),
179 				"rtsx_usb_get_rsp failed (err = %d)\n", err);
180 		}
181 
182 		return err;
183 	}
184 
185 	if (cmd != NULL) {
186 		cmd->resp[0] = get_unaligned_be32(ucr->rsp_buf + 1);
187 		dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
188 				cmd->resp[0]);
189 	}
190 
191 	if (buf && buf_len) {
192 		/* 2-byte aligned part */
193 		err = rtsx_usb_read_ppbuf(ucr, buf, byte_cnt - (byte_cnt % 2));
194 		if (err) {
195 			dev_dbg(sdmmc_dev(host),
196 				"rtsx_usb_read_ppbuf failed (err = %d)\n", err);
197 			return err;
198 		}
199 
200 		/* unaligned byte */
201 		if (byte_cnt % 2)
202 			return rtsx_usb_read_register(ucr,
203 					PPBUF_BASE2 + byte_cnt,
204 					buf + byte_cnt - 1);
205 	}
206 
207 	return 0;
208 }
209 
210 static int sd_write_data(struct rtsx_usb_sdmmc *host, struct mmc_command *cmd,
211 		u16 byte_cnt, u8 *buf, int buf_len, int timeout)
212 {
213 	struct rtsx_ucr *ucr = host->ucr;
214 	int err;
215 	u8 trans_mode;
216 
217 	if (!buf)
218 		buf_len = 0;
219 
220 	if (buf && buf_len) {
221 		err = rtsx_usb_write_ppbuf(ucr, buf, buf_len);
222 		if (err) {
223 			dev_dbg(sdmmc_dev(host),
224 				"rtsx_usb_write_ppbuf failed (err = %d)\n",
225 				err);
226 			return err;
227 		}
228 	}
229 
230 	trans_mode = (cmd != NULL) ? SD_TM_AUTO_WRITE_2 : SD_TM_AUTO_WRITE_3;
231 	rtsx_usb_init_cmd(ucr);
232 
233 	if (cmd != NULL) {
234 		dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD%d\n", __func__,
235 				cmd->opcode);
236 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
237 				SD_CMD0, 0xFF, (u8)(cmd->opcode) | 0x40);
238 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
239 				SD_CMD1, 0xFF, (u8)(cmd->arg >> 24));
240 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
241 				SD_CMD2, 0xFF, (u8)(cmd->arg >> 16));
242 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
243 				SD_CMD3, 0xFF, (u8)(cmd->arg >> 8));
244 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
245 				SD_CMD4, 0xFF, (u8)cmd->arg);
246 	}
247 
248 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, (u8)byte_cnt);
249 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H,
250 			0xFF, (u8)(byte_cnt >> 8));
251 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L, 0xFF, 1);
252 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H, 0xFF, 0);
253 
254 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF,
255 		SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
256 		SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_6);
257 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
258 			CARD_DATA_SOURCE, 0x01, PINGPONG_BUFFER);
259 
260 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
261 			trans_mode | SD_TRANSFER_START);
262 	rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
263 			SD_TRANSFER_END, SD_TRANSFER_END);
264 
265 	if (cmd != NULL) {
266 		rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD1, 0, 0);
267 		rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD2, 0, 0);
268 		rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD3, 0, 0);
269 		rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD4, 0, 0);
270 	}
271 
272 	err = rtsx_usb_send_cmd(ucr, MODE_CR, timeout);
273 	if (err) {
274 		dev_dbg(sdmmc_dev(host),
275 			"rtsx_usb_send_cmd failed (err = %d)\n", err);
276 		return err;
277 	}
278 
279 	err = rtsx_usb_get_rsp(ucr, !cmd ? 1 : 5, timeout);
280 	if (err) {
281 		sd_print_debug_regs(host);
282 		dev_dbg(sdmmc_dev(host),
283 			"rtsx_usb_get_rsp failed (err = %d)\n", err);
284 		return err;
285 	}
286 
287 	if (cmd != NULL) {
288 		cmd->resp[0] = get_unaligned_be32(ucr->rsp_buf + 1);
289 		dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
290 				cmd->resp[0]);
291 	}
292 
293 	return 0;
294 }
295 
296 static void sd_send_cmd_get_rsp(struct rtsx_usb_sdmmc *host,
297 		struct mmc_command *cmd)
298 {
299 	struct rtsx_ucr *ucr = host->ucr;
300 	u8 cmd_idx = (u8)cmd->opcode;
301 	u32 arg = cmd->arg;
302 	int err = 0;
303 	int timeout = 100;
304 	int i;
305 	u8 *ptr;
306 	int stat_idx = 0;
307 	int len = 2;
308 	u8 rsp_type;
309 
310 	dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
311 			__func__, cmd_idx, arg);
312 
313 	/* Response type:
314 	 * R0
315 	 * R1, R5, R6, R7
316 	 * R1b
317 	 * R2
318 	 * R3, R4
319 	 */
320 	switch (mmc_resp_type(cmd)) {
321 	case MMC_RSP_NONE:
322 		rsp_type = SD_RSP_TYPE_R0;
323 		break;
324 	case MMC_RSP_R1:
325 		rsp_type = SD_RSP_TYPE_R1;
326 		break;
327 	case MMC_RSP_R1 & ~MMC_RSP_CRC:
328 		rsp_type = SD_RSP_TYPE_R1 | SD_NO_CHECK_CRC7;
329 		break;
330 	case MMC_RSP_R1B:
331 		rsp_type = SD_RSP_TYPE_R1b;
332 		break;
333 	case MMC_RSP_R2:
334 		rsp_type = SD_RSP_TYPE_R2;
335 		break;
336 	case MMC_RSP_R3:
337 		rsp_type = SD_RSP_TYPE_R3;
338 		break;
339 	default:
340 		dev_dbg(sdmmc_dev(host), "cmd->flag is not valid\n");
341 		err = -EINVAL;
342 		goto out;
343 	}
344 
345 	if (rsp_type == SD_RSP_TYPE_R1b)
346 		timeout = 3000;
347 
348 	if (cmd->opcode == SD_SWITCH_VOLTAGE) {
349 		err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
350 				SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
351 				SD_CLK_TOGGLE_EN);
352 		if (err)
353 			goto out;
354 	}
355 
356 	rtsx_usb_init_cmd(ucr);
357 
358 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD0, 0xFF, 0x40 | cmd_idx);
359 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD1, 0xFF, (u8)(arg >> 24));
360 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD2, 0xFF, (u8)(arg >> 16));
361 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD3, 0xFF, (u8)(arg >> 8));
362 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD4, 0xFF, (u8)arg);
363 
364 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF, rsp_type);
365 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
366 			0x01, PINGPONG_BUFFER);
367 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER,
368 			0xFF, SD_TM_CMD_RSP | SD_TRANSFER_START);
369 	rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
370 		     SD_TRANSFER_END | SD_STAT_IDLE,
371 		     SD_TRANSFER_END | SD_STAT_IDLE);
372 
373 	if (rsp_type == SD_RSP_TYPE_R2) {
374 		/* Read data from ping-pong buffer */
375 		for (i = PPBUF_BASE2; i < PPBUF_BASE2 + 16; i++)
376 			rtsx_usb_add_cmd(ucr, READ_REG_CMD, (u16)i, 0, 0);
377 		stat_idx = 16;
378 	} else if (rsp_type != SD_RSP_TYPE_R0) {
379 		/* Read data from SD_CMDx registers */
380 		for (i = SD_CMD0; i <= SD_CMD4; i++)
381 			rtsx_usb_add_cmd(ucr, READ_REG_CMD, (u16)i, 0, 0);
382 		stat_idx = 5;
383 	}
384 	len += stat_idx;
385 
386 	rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_STAT1, 0, 0);
387 
388 	err = rtsx_usb_send_cmd(ucr, MODE_CR, 100);
389 	if (err) {
390 		dev_dbg(sdmmc_dev(host),
391 			"rtsx_usb_send_cmd error (err = %d)\n", err);
392 		goto out;
393 	}
394 
395 	err = rtsx_usb_get_rsp(ucr, len, timeout);
396 	if (err || (ucr->rsp_buf[0] & SD_TRANSFER_ERR)) {
397 		sd_print_debug_regs(host);
398 		sd_clear_error(host);
399 
400 		if (!err) {
401 			dev_dbg(sdmmc_dev(host),
402 				"Transfer failed (SD_TRANSFER = %02x)\n",
403 					ucr->rsp_buf[0]);
404 			err = -EIO;
405 		} else {
406 			dev_dbg(sdmmc_dev(host),
407 				"rtsx_usb_get_rsp failed (err = %d)\n", err);
408 		}
409 
410 		goto out;
411 	}
412 
413 	if (rsp_type == SD_RSP_TYPE_R0) {
414 		err = 0;
415 		goto out;
416 	}
417 
418 	/* Skip result of CHECK_REG_CMD */
419 	ptr = ucr->rsp_buf + 1;
420 
421 	/* Check (Start,Transmission) bit of Response */
422 	if ((ptr[0] & 0xC0) != 0) {
423 		err = -EILSEQ;
424 		dev_dbg(sdmmc_dev(host), "Invalid response bit\n");
425 		goto out;
426 	}
427 
428 	/* Check CRC7 */
429 	if (!(rsp_type & SD_NO_CHECK_CRC7)) {
430 		if (ptr[stat_idx] & SD_CRC7_ERR) {
431 			err = -EILSEQ;
432 			dev_dbg(sdmmc_dev(host), "CRC7 error\n");
433 			goto out;
434 		}
435 	}
436 
437 	if (rsp_type == SD_RSP_TYPE_R2) {
438 		/*
439 		 * The controller offloads the last byte {CRC-7, end bit 1'b1}
440 		 * of response type R2. Assign dummy CRC, 0, and end bit to the
441 		 * byte(ptr[16], goes into the LSB of resp[3] later).
442 		 */
443 		ptr[16] = 1;
444 
445 		for (i = 0; i < 4; i++) {
446 			cmd->resp[i] = get_unaligned_be32(ptr + 1 + i * 4);
447 			dev_dbg(sdmmc_dev(host), "cmd->resp[%d] = 0x%08x\n",
448 					i, cmd->resp[i]);
449 		}
450 	} else {
451 		cmd->resp[0] = get_unaligned_be32(ptr + 1);
452 		dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
453 				cmd->resp[0]);
454 	}
455 
456 out:
457 	cmd->error = err;
458 }
459 
460 static int sd_rw_multi(struct rtsx_usb_sdmmc *host, struct mmc_request *mrq)
461 {
462 	struct rtsx_ucr *ucr = host->ucr;
463 	struct mmc_data *data = mrq->data;
464 	int read = (data->flags & MMC_DATA_READ) ? 1 : 0;
465 	u8 cfg2, trans_mode;
466 	int err;
467 	u8 flag;
468 	size_t data_len = data->blksz * data->blocks;
469 	unsigned int pipe;
470 
471 	if (read) {
472 		dev_dbg(sdmmc_dev(host), "%s: read %zu bytes\n",
473 				__func__, data_len);
474 		cfg2 = SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
475 			SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_0;
476 		trans_mode = SD_TM_AUTO_READ_3;
477 	} else {
478 		dev_dbg(sdmmc_dev(host), "%s: write %zu bytes\n",
479 				__func__, data_len);
480 		cfg2 = SD_NO_CALCULATE_CRC7 | SD_CHECK_CRC16 |
481 			SD_NO_WAIT_BUSY_END | SD_NO_CHECK_CRC7 | SD_RSP_LEN_0;
482 		trans_mode = SD_TM_AUTO_WRITE_3;
483 	}
484 
485 	rtsx_usb_init_cmd(ucr);
486 
487 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, 0x00);
488 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H, 0xFF, 0x02);
489 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L,
490 			0xFF, (u8)data->blocks);
491 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H,
492 			0xFF, (u8)(data->blocks >> 8));
493 
494 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
495 			0x01, RING_BUFFER);
496 
497 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC3,
498 			0xFF, (u8)(data_len >> 24));
499 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC2,
500 			0xFF, (u8)(data_len >> 16));
501 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC1,
502 			0xFF, (u8)(data_len >> 8));
503 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC0,
504 			0xFF, (u8)data_len);
505 	if (read) {
506 		flag = MODE_CDIR;
507 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_CTL,
508 				0x03 | DMA_PACK_SIZE_MASK,
509 				DMA_DIR_FROM_CARD | DMA_EN | DMA_512);
510 	} else {
511 		flag = MODE_CDOR;
512 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_CTL,
513 				0x03 | DMA_PACK_SIZE_MASK,
514 				DMA_DIR_TO_CARD | DMA_EN | DMA_512);
515 	}
516 
517 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2);
518 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
519 			trans_mode | SD_TRANSFER_START);
520 	rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
521 			SD_TRANSFER_END, SD_TRANSFER_END);
522 
523 	err = rtsx_usb_send_cmd(ucr, flag, 100);
524 	if (err)
525 		return err;
526 
527 	if (read)
528 		pipe = usb_rcvbulkpipe(ucr->pusb_dev, EP_BULK_IN);
529 	else
530 		pipe = usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT);
531 
532 	err = rtsx_usb_transfer_data(ucr, pipe, data->sg, data_len,
533 			data->sg_len,  NULL, 10000);
534 	if (err) {
535 		dev_dbg(sdmmc_dev(host), "rtsx_usb_transfer_data error %d\n"
536 				, err);
537 		sd_clear_error(host);
538 		return err;
539 	}
540 
541 	return rtsx_usb_get_rsp(ucr, 1, 2000);
542 }
543 
544 static inline void sd_enable_initial_mode(struct rtsx_usb_sdmmc *host)
545 {
546 	rtsx_usb_write_register(host->ucr, SD_CFG1,
547 			SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_128);
548 }
549 
550 static inline void sd_disable_initial_mode(struct rtsx_usb_sdmmc *host)
551 {
552 	rtsx_usb_write_register(host->ucr, SD_CFG1,
553 			SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_0);
554 }
555 
556 static void sd_normal_rw(struct rtsx_usb_sdmmc *host,
557 		struct mmc_request *mrq)
558 {
559 	struct mmc_command *cmd = mrq->cmd;
560 	struct mmc_data *data = mrq->data;
561 	u8 *buf;
562 
563 	buf = kzalloc(data->blksz, GFP_NOIO);
564 	if (!buf) {
565 		cmd->error = -ENOMEM;
566 		return;
567 	}
568 
569 	if (data->flags & MMC_DATA_READ) {
570 		if (host->initial_mode)
571 			sd_disable_initial_mode(host);
572 
573 		cmd->error = sd_read_data(host, cmd, (u16)data->blksz, buf,
574 				data->blksz, 200);
575 
576 		if (host->initial_mode)
577 			sd_enable_initial_mode(host);
578 
579 		sg_copy_from_buffer(data->sg, data->sg_len, buf, data->blksz);
580 	} else {
581 		sg_copy_to_buffer(data->sg, data->sg_len, buf, data->blksz);
582 
583 		cmd->error = sd_write_data(host, cmd, (u16)data->blksz, buf,
584 				data->blksz, 200);
585 	}
586 
587 	kfree(buf);
588 }
589 
590 static int sd_change_phase(struct rtsx_usb_sdmmc *host, u8 sample_point, int tx)
591 {
592 	struct rtsx_ucr *ucr = host->ucr;
593 	int err;
594 
595 	dev_dbg(sdmmc_dev(host), "%s: %s sample_point = %d\n",
596 			__func__, tx ? "TX" : "RX", sample_point);
597 
598 	rtsx_usb_init_cmd(ucr);
599 
600 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, CLK_CHANGE);
601 
602 	if (tx)
603 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
604 				0x0F, sample_point);
605 	else
606 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK1_CTL,
607 				0x0F, sample_point);
608 
609 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL, PHASE_NOT_RESET, 0);
610 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
611 			PHASE_NOT_RESET, PHASE_NOT_RESET);
612 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, 0);
613 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1, SD_ASYNC_FIFO_RST, 0);
614 
615 	err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
616 	if (err)
617 		return err;
618 
619 	return 0;
620 }
621 
622 static inline u32 get_phase_point(u32 phase_map, unsigned int idx)
623 {
624 	idx &= MAX_PHASE;
625 	return phase_map & (1 << idx);
626 }
627 
628 static int get_phase_len(u32 phase_map, unsigned int idx)
629 {
630 	int i;
631 
632 	for (i = 0; i < MAX_PHASE + 1; i++) {
633 		if (get_phase_point(phase_map, idx + i) == 0)
634 			return i;
635 	}
636 	return MAX_PHASE + 1;
637 }
638 
639 static u8 sd_search_final_phase(struct rtsx_usb_sdmmc *host, u32 phase_map)
640 {
641 	int start = 0, len = 0;
642 	int start_final = 0, len_final = 0;
643 	u8 final_phase = 0xFF;
644 
645 	if (phase_map == 0) {
646 		dev_dbg(sdmmc_dev(host), "Phase: [map:%x]\n", phase_map);
647 		return final_phase;
648 	}
649 
650 	while (start < MAX_PHASE + 1) {
651 		len = get_phase_len(phase_map, start);
652 		if (len_final < len) {
653 			start_final = start;
654 			len_final = len;
655 		}
656 		start += len ? len : 1;
657 	}
658 
659 	final_phase = (start_final + len_final / 2) & MAX_PHASE;
660 	dev_dbg(sdmmc_dev(host), "Phase: [map:%x] [maxlen:%d] [final:%d]\n",
661 		phase_map, len_final, final_phase);
662 
663 	return final_phase;
664 }
665 
666 static void sd_wait_data_idle(struct rtsx_usb_sdmmc *host)
667 {
668 	int err, i;
669 	u8 val = 0;
670 
671 	for (i = 0; i < 100; i++) {
672 		err = rtsx_usb_ep0_read_register(host->ucr,
673 				SD_DATA_STATE, &val);
674 		if (val & SD_DATA_IDLE)
675 			return;
676 
677 		usleep_range(100, 1000);
678 	}
679 }
680 
681 static int sd_tuning_rx_cmd(struct rtsx_usb_sdmmc *host,
682 		u8 opcode, u8 sample_point)
683 {
684 	int err;
685 	struct mmc_command cmd = {0};
686 
687 	err = sd_change_phase(host, sample_point, 0);
688 	if (err)
689 		return err;
690 
691 	cmd.opcode = MMC_SEND_TUNING_BLOCK;
692 	err = sd_read_data(host, &cmd, 0x40, NULL, 0, 100);
693 	if (err) {
694 		/* Wait till SD DATA IDLE */
695 		sd_wait_data_idle(host);
696 		sd_clear_error(host);
697 		return err;
698 	}
699 
700 	return 0;
701 }
702 
703 static void sd_tuning_phase(struct rtsx_usb_sdmmc *host,
704 		u8 opcode, u16 *phase_map)
705 {
706 	int err, i;
707 	u16 raw_phase_map = 0;
708 
709 	for (i = MAX_PHASE; i >= 0; i--) {
710 		err = sd_tuning_rx_cmd(host, opcode, (u8)i);
711 		if (!err)
712 			raw_phase_map |= 1 << i;
713 	}
714 
715 	if (phase_map)
716 		*phase_map = raw_phase_map;
717 }
718 
719 static int sd_tuning_rx(struct rtsx_usb_sdmmc *host, u8 opcode)
720 {
721 	int err, i;
722 	u16 raw_phase_map[RX_TUNING_CNT] = {0}, phase_map;
723 	u8 final_phase;
724 
725 	/* setting fixed default TX phase */
726 	err = sd_change_phase(host, 0x01, 1);
727 	if (err) {
728 		dev_dbg(sdmmc_dev(host), "TX phase setting failed\n");
729 		return err;
730 	}
731 
732 	/* tuning RX phase */
733 	for (i = 0; i < RX_TUNING_CNT; i++) {
734 		sd_tuning_phase(host, opcode, &(raw_phase_map[i]));
735 
736 		if (raw_phase_map[i] == 0)
737 			break;
738 	}
739 
740 	phase_map = 0xFFFF;
741 	for (i = 0; i < RX_TUNING_CNT; i++) {
742 		dev_dbg(sdmmc_dev(host), "RX raw_phase_map[%d] = 0x%04x\n",
743 				i, raw_phase_map[i]);
744 		phase_map &= raw_phase_map[i];
745 	}
746 	dev_dbg(sdmmc_dev(host), "RX phase_map = 0x%04x\n", phase_map);
747 
748 	if (phase_map) {
749 		final_phase = sd_search_final_phase(host, phase_map);
750 		if (final_phase == 0xFF)
751 			return -EINVAL;
752 
753 		err = sd_change_phase(host, final_phase, 0);
754 		if (err)
755 			return err;
756 	} else {
757 		return -EINVAL;
758 	}
759 
760 	return 0;
761 }
762 
763 static int sdmmc_get_ro(struct mmc_host *mmc)
764 {
765 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
766 	struct rtsx_ucr *ucr = host->ucr;
767 	int err;
768 	u16 val;
769 
770 	if (host->host_removal)
771 		return -ENOMEDIUM;
772 
773 	mutex_lock(&ucr->dev_mutex);
774 
775 	/* Check SD card detect */
776 	err = rtsx_usb_get_card_status(ucr, &val);
777 
778 	mutex_unlock(&ucr->dev_mutex);
779 
780 
781 	/* Treat failed detection as non-ro */
782 	if (err)
783 		return 0;
784 
785 	if (val & SD_WP)
786 		return 1;
787 
788 	return 0;
789 }
790 
791 static int sdmmc_get_cd(struct mmc_host *mmc)
792 {
793 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
794 	struct rtsx_ucr *ucr = host->ucr;
795 	int err;
796 	u16 val;
797 
798 	if (host->host_removal)
799 		return -ENOMEDIUM;
800 
801 	mutex_lock(&ucr->dev_mutex);
802 
803 	/* Check SD card detect */
804 	err = rtsx_usb_get_card_status(ucr, &val);
805 
806 	mutex_unlock(&ucr->dev_mutex);
807 
808 	/* Treat failed detection as non-exist */
809 	if (err)
810 		goto no_card;
811 
812 	if (val & SD_CD) {
813 		host->card_exist = true;
814 		return 1;
815 	}
816 
817 no_card:
818 	host->card_exist = false;
819 	return 0;
820 }
821 
822 static void sdmmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
823 {
824 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
825 	struct rtsx_ucr *ucr = host->ucr;
826 	struct mmc_command *cmd = mrq->cmd;
827 	struct mmc_data *data = mrq->data;
828 	unsigned int data_size = 0;
829 
830 	dev_dbg(sdmmc_dev(host), "%s\n", __func__);
831 
832 	if (host->host_removal) {
833 		cmd->error = -ENOMEDIUM;
834 		goto finish;
835 	}
836 
837 	if ((!host->card_exist)) {
838 		cmd->error = -ENOMEDIUM;
839 		goto finish_detect_card;
840 	}
841 
842 	/*
843 	 * Reject SDIO CMDs to speed up card identification
844 	 * since unsupported
845 	 */
846 	if (cmd->opcode == SD_IO_SEND_OP_COND ||
847 	    cmd->opcode == SD_IO_RW_DIRECT ||
848 	    cmd->opcode == SD_IO_RW_EXTENDED) {
849 		cmd->error = -EINVAL;
850 		goto finish;
851 	}
852 
853 	mutex_lock(&ucr->dev_mutex);
854 
855 	mutex_lock(&host->host_mutex);
856 	host->mrq = mrq;
857 	mutex_unlock(&host->host_mutex);
858 
859 	if (mrq->data)
860 		data_size = data->blocks * data->blksz;
861 
862 	if (!data_size) {
863 		sd_send_cmd_get_rsp(host, cmd);
864 	} else if ((!(data_size % 512) && cmd->opcode != MMC_SEND_EXT_CSD) ||
865 		   mmc_op_multi(cmd->opcode)) {
866 		sd_send_cmd_get_rsp(host, cmd);
867 
868 		if (!cmd->error) {
869 			sd_rw_multi(host, mrq);
870 
871 			if (mmc_op_multi(cmd->opcode) && mrq->stop) {
872 				sd_send_cmd_get_rsp(host, mrq->stop);
873 				rtsx_usb_write_register(ucr, MC_FIFO_CTL,
874 						FIFO_FLUSH, FIFO_FLUSH);
875 			}
876 		}
877 	} else {
878 		sd_normal_rw(host, mrq);
879 	}
880 
881 	if (mrq->data) {
882 		if (cmd->error || data->error)
883 			data->bytes_xfered = 0;
884 		else
885 			data->bytes_xfered = data->blocks * data->blksz;
886 	}
887 
888 	mutex_unlock(&ucr->dev_mutex);
889 
890 finish_detect_card:
891 	if (cmd->error) {
892 		/*
893 		 * detect card when fail to update card existence state and
894 		 * speed up card removal when retry
895 		 */
896 		sdmmc_get_cd(mmc);
897 		dev_dbg(sdmmc_dev(host), "cmd->error = %d\n", cmd->error);
898 	}
899 
900 finish:
901 	mutex_lock(&host->host_mutex);
902 	host->mrq = NULL;
903 	mutex_unlock(&host->host_mutex);
904 
905 	mmc_request_done(mmc, mrq);
906 }
907 
908 static int sd_set_bus_width(struct rtsx_usb_sdmmc *host,
909 		unsigned char bus_width)
910 {
911 	int err = 0;
912 	u8 width[] = {
913 		[MMC_BUS_WIDTH_1] = SD_BUS_WIDTH_1BIT,
914 		[MMC_BUS_WIDTH_4] = SD_BUS_WIDTH_4BIT,
915 		[MMC_BUS_WIDTH_8] = SD_BUS_WIDTH_8BIT,
916 	};
917 
918 	if (bus_width <= MMC_BUS_WIDTH_8)
919 		err = rtsx_usb_write_register(host->ucr, SD_CFG1,
920 				0x03, width[bus_width]);
921 
922 	return err;
923 }
924 
925 static int sd_pull_ctl_disable_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, 0x55);
930 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
931 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
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_disable_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, 0x65);
944 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
945 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
946 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
947 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x56);
948 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x59);
949 
950 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
951 }
952 
953 static int sd_pull_ctl_enable_lqfp48(struct rtsx_ucr *ucr)
954 {
955 	rtsx_usb_init_cmd(ucr);
956 
957 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0xAA);
958 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0xAA);
959 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0xA9);
960 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
961 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
962 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0xA5);
963 
964 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
965 }
966 
967 static int sd_pull_ctl_enable_qfn24(struct rtsx_ucr *ucr)
968 {
969 	rtsx_usb_init_cmd(ucr);
970 
971 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0xA5);
972 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x9A);
973 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0xA5);
974 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x9A);
975 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x65);
976 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x5A);
977 
978 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
979 }
980 
981 static int sd_power_on(struct rtsx_usb_sdmmc *host)
982 {
983 	struct rtsx_ucr *ucr = host->ucr;
984 	int err;
985 
986 	dev_dbg(sdmmc_dev(host), "%s\n", __func__);
987 	rtsx_usb_init_cmd(ucr);
988 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SELECT, 0x07, SD_MOD_SEL);
989 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SHARE_MODE,
990 			CARD_SHARE_MASK, CARD_SHARE_SD);
991 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN,
992 			SD_CLK_EN, SD_CLK_EN);
993 	err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
994 	if (err)
995 		return err;
996 
997 	if (CHECK_PKG(ucr, LQFP48))
998 		err = sd_pull_ctl_enable_lqfp48(ucr);
999 	else
1000 		err = sd_pull_ctl_enable_qfn24(ucr);
1001 	if (err)
1002 		return err;
1003 
1004 	err = rtsx_usb_write_register(ucr, CARD_PWR_CTL,
1005 			POWER_MASK, PARTIAL_POWER_ON);
1006 	if (err)
1007 		return err;
1008 
1009 	usleep_range(800, 1000);
1010 
1011 	rtsx_usb_init_cmd(ucr);
1012 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
1013 			POWER_MASK|LDO3318_PWR_MASK, POWER_ON|LDO_ON);
1014 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE,
1015 			SD_OUTPUT_EN, SD_OUTPUT_EN);
1016 
1017 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
1018 }
1019 
1020 static int sd_power_off(struct rtsx_usb_sdmmc *host)
1021 {
1022 	struct rtsx_ucr *ucr = host->ucr;
1023 	int err;
1024 
1025 	dev_dbg(sdmmc_dev(host), "%s\n", __func__);
1026 	rtsx_usb_init_cmd(ucr);
1027 
1028 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN, SD_CLK_EN, 0);
1029 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE, SD_OUTPUT_EN, 0);
1030 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
1031 			POWER_MASK, POWER_OFF);
1032 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
1033 			POWER_MASK|LDO3318_PWR_MASK, POWER_OFF|LDO_SUSPEND);
1034 
1035 	err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
1036 	if (err)
1037 		return err;
1038 
1039 	if (CHECK_PKG(ucr, LQFP48))
1040 			return sd_pull_ctl_disable_lqfp48(ucr);
1041 	return sd_pull_ctl_disable_qfn24(ucr);
1042 }
1043 
1044 static int sd_set_power_mode(struct rtsx_usb_sdmmc *host,
1045 		unsigned char power_mode)
1046 {
1047 	int err;
1048 
1049 	if (power_mode != MMC_POWER_OFF)
1050 		power_mode = MMC_POWER_ON;
1051 
1052 	if (power_mode == host->power_mode)
1053 		return 0;
1054 
1055 	if (power_mode == MMC_POWER_OFF) {
1056 		err = sd_power_off(host);
1057 		pm_runtime_put(sdmmc_dev(host));
1058 	} else {
1059 		pm_runtime_get_sync(sdmmc_dev(host));
1060 		err = sd_power_on(host);
1061 	}
1062 
1063 	if (!err)
1064 		host->power_mode = power_mode;
1065 
1066 	return err;
1067 }
1068 
1069 static int sd_set_timing(struct rtsx_usb_sdmmc *host,
1070 		unsigned char timing, bool *ddr_mode)
1071 {
1072 	struct rtsx_ucr *ucr = host->ucr;
1073 	int err;
1074 
1075 	*ddr_mode = false;
1076 
1077 	rtsx_usb_init_cmd(ucr);
1078 
1079 	switch (timing) {
1080 	case MMC_TIMING_UHS_SDR104:
1081 	case MMC_TIMING_UHS_SDR50:
1082 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1083 				0x0C | SD_ASYNC_FIFO_RST,
1084 				SD_30_MODE | SD_ASYNC_FIFO_RST);
1085 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1086 				CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
1087 		break;
1088 
1089 	case MMC_TIMING_UHS_DDR50:
1090 		*ddr_mode = true;
1091 
1092 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1093 				0x0C | SD_ASYNC_FIFO_RST,
1094 				SD_DDR_MODE | SD_ASYNC_FIFO_RST);
1095 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1096 				CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
1097 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1098 				DDR_VAR_TX_CMD_DAT, DDR_VAR_TX_CMD_DAT);
1099 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1100 				DDR_VAR_RX_DAT | DDR_VAR_RX_CMD,
1101 				DDR_VAR_RX_DAT | DDR_VAR_RX_CMD);
1102 		break;
1103 
1104 	case MMC_TIMING_MMC_HS:
1105 	case MMC_TIMING_SD_HS:
1106 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1107 				0x0C, SD_20_MODE);
1108 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1109 				CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1110 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1111 				SD20_TX_SEL_MASK, SD20_TX_14_AHEAD);
1112 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1113 				SD20_RX_SEL_MASK, SD20_RX_14_DELAY);
1114 		break;
1115 
1116 	default:
1117 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
1118 				SD_CFG1, 0x0C, SD_20_MODE);
1119 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1120 				CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1121 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
1122 				SD_PUSH_POINT_CTL, 0xFF, 0);
1123 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1124 				SD20_RX_SEL_MASK, SD20_RX_POS_EDGE);
1125 		break;
1126 	}
1127 
1128 	err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
1129 
1130 	return err;
1131 }
1132 
1133 static void sdmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1134 {
1135 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1136 	struct rtsx_ucr *ucr = host->ucr;
1137 
1138 	dev_dbg(sdmmc_dev(host), "%s\n", __func__);
1139 	mutex_lock(&ucr->dev_mutex);
1140 
1141 	if (rtsx_usb_card_exclusive_check(ucr, RTSX_USB_SD_CARD)) {
1142 		mutex_unlock(&ucr->dev_mutex);
1143 		return;
1144 	}
1145 
1146 	sd_set_power_mode(host, ios->power_mode);
1147 	sd_set_bus_width(host, ios->bus_width);
1148 	sd_set_timing(host, ios->timing, &host->ddr_mode);
1149 
1150 	host->vpclk = false;
1151 	host->double_clk = true;
1152 
1153 	switch (ios->timing) {
1154 	case MMC_TIMING_UHS_SDR104:
1155 	case MMC_TIMING_UHS_SDR50:
1156 		host->ssc_depth = SSC_DEPTH_2M;
1157 		host->vpclk = true;
1158 		host->double_clk = false;
1159 		break;
1160 	case MMC_TIMING_UHS_DDR50:
1161 	case MMC_TIMING_UHS_SDR25:
1162 		host->ssc_depth = SSC_DEPTH_1M;
1163 		break;
1164 	default:
1165 		host->ssc_depth = SSC_DEPTH_512K;
1166 		break;
1167 	}
1168 
1169 	host->initial_mode = (ios->clock <= 1000000) ? true : false;
1170 	host->clock = ios->clock;
1171 
1172 	rtsx_usb_switch_clock(host->ucr, host->clock, host->ssc_depth,
1173 			host->initial_mode, host->double_clk, host->vpclk);
1174 
1175 	mutex_unlock(&ucr->dev_mutex);
1176 	dev_dbg(sdmmc_dev(host), "%s end\n", __func__);
1177 }
1178 
1179 static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1180 {
1181 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1182 	struct rtsx_ucr *ucr = host->ucr;
1183 	int err = 0;
1184 
1185 	dev_dbg(sdmmc_dev(host), "%s: signal_voltage = %d\n",
1186 			__func__, ios->signal_voltage);
1187 
1188 	if (host->host_removal)
1189 		return -ENOMEDIUM;
1190 
1191 	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_120)
1192 		return -EPERM;
1193 
1194 	mutex_lock(&ucr->dev_mutex);
1195 
1196 	err = rtsx_usb_card_exclusive_check(ucr, RTSX_USB_SD_CARD);
1197 	if (err) {
1198 		mutex_unlock(&ucr->dev_mutex);
1199 		return err;
1200 	}
1201 
1202 	/* Let mmc core do the busy checking, simply stop the forced-toggle
1203 	 * clock(while issuing CMD11) and switch voltage.
1204 	 */
1205 	rtsx_usb_init_cmd(ucr);
1206 
1207 	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1208 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PAD_CTL,
1209 				SD_IO_USING_1V8, SD_IO_USING_3V3);
1210 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG,
1211 				TUNE_SD18_MASK, TUNE_SD18_3V3);
1212 	} else {
1213 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BUS_STAT,
1214 				SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
1215 				SD_CLK_FORCE_STOP);
1216 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PAD_CTL,
1217 				SD_IO_USING_1V8, SD_IO_USING_1V8);
1218 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG,
1219 				TUNE_SD18_MASK, TUNE_SD18_1V8);
1220 	}
1221 
1222 	err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
1223 	mutex_unlock(&ucr->dev_mutex);
1224 
1225 	return err;
1226 }
1227 
1228 static int sdmmc_card_busy(struct mmc_host *mmc)
1229 {
1230 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1231 	struct rtsx_ucr *ucr = host->ucr;
1232 	int err;
1233 	u8 stat;
1234 	u8 mask = SD_DAT3_STATUS | SD_DAT2_STATUS | SD_DAT1_STATUS
1235 		| SD_DAT0_STATUS;
1236 
1237 	dev_dbg(sdmmc_dev(host), "%s\n", __func__);
1238 
1239 	mutex_lock(&ucr->dev_mutex);
1240 
1241 	err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
1242 			SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
1243 			SD_CLK_TOGGLE_EN);
1244 	if (err)
1245 		goto out;
1246 
1247 	mdelay(1);
1248 
1249 	err = rtsx_usb_read_register(ucr, SD_BUS_STAT, &stat);
1250 	if (err)
1251 		goto out;
1252 
1253 	err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
1254 			SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
1255 out:
1256 	mutex_unlock(&ucr->dev_mutex);
1257 
1258 	if (err)
1259 		return err;
1260 
1261 	/* check if any pin between dat[0:3] is low */
1262 	if ((stat & mask) != mask)
1263 		return 1;
1264 	else
1265 		return 0;
1266 }
1267 
1268 static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
1269 {
1270 	struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1271 	struct rtsx_ucr *ucr = host->ucr;
1272 	int err = 0;
1273 
1274 	if (host->host_removal)
1275 		return -ENOMEDIUM;
1276 
1277 	mutex_lock(&ucr->dev_mutex);
1278 
1279 	if (!host->ddr_mode)
1280 		err = sd_tuning_rx(host, MMC_SEND_TUNING_BLOCK);
1281 
1282 	mutex_unlock(&ucr->dev_mutex);
1283 
1284 	return err;
1285 }
1286 
1287 static const struct mmc_host_ops rtsx_usb_sdmmc_ops = {
1288 	.request = sdmmc_request,
1289 	.set_ios = sdmmc_set_ios,
1290 	.get_ro = sdmmc_get_ro,
1291 	.get_cd = sdmmc_get_cd,
1292 	.start_signal_voltage_switch = sdmmc_switch_voltage,
1293 	.card_busy = sdmmc_card_busy,
1294 	.execute_tuning = sdmmc_execute_tuning,
1295 };
1296 
1297 #ifdef RTSX_USB_USE_LEDS_CLASS
1298 static void rtsx_usb_led_control(struct led_classdev *led,
1299 	enum led_brightness brightness)
1300 {
1301 	struct rtsx_usb_sdmmc *host = container_of(led,
1302 			struct rtsx_usb_sdmmc, led);
1303 
1304 	if (host->host_removal)
1305 		return;
1306 
1307 	host->led.brightness = brightness;
1308 	schedule_work(&host->led_work);
1309 }
1310 
1311 static void rtsx_usb_update_led(struct work_struct *work)
1312 {
1313 	struct rtsx_usb_sdmmc *host =
1314 		container_of(work, struct rtsx_usb_sdmmc, led_work);
1315 	struct rtsx_ucr *ucr = host->ucr;
1316 
1317 	mutex_lock(&ucr->dev_mutex);
1318 
1319 	if (host->led.brightness == LED_OFF)
1320 		rtsx_usb_turn_off_led(ucr);
1321 	else
1322 		rtsx_usb_turn_on_led(ucr);
1323 
1324 	mutex_unlock(&ucr->dev_mutex);
1325 }
1326 #endif
1327 
1328 static void rtsx_usb_init_host(struct rtsx_usb_sdmmc *host)
1329 {
1330 	struct mmc_host *mmc = host->mmc;
1331 
1332 	mmc->f_min = 250000;
1333 	mmc->f_max = 208000000;
1334 	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
1335 	mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED |
1336 		MMC_CAP_MMC_HIGHSPEED | MMC_CAP_BUS_WIDTH_TEST |
1337 		MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | MMC_CAP_UHS_SDR50 |
1338 		MMC_CAP_NEEDS_POLL;
1339 	mmc->caps2 = MMC_CAP2_NO_PRESCAN_POWERUP | MMC_CAP2_FULL_PWR_CYCLE;
1340 
1341 	mmc->max_current_330 = 400;
1342 	mmc->max_current_180 = 800;
1343 	mmc->ops = &rtsx_usb_sdmmc_ops;
1344 	mmc->max_segs = 256;
1345 	mmc->max_seg_size = 65536;
1346 	mmc->max_blk_size = 512;
1347 	mmc->max_blk_count = 65535;
1348 	mmc->max_req_size = 524288;
1349 
1350 	host->power_mode = MMC_POWER_OFF;
1351 }
1352 
1353 static int rtsx_usb_sdmmc_drv_probe(struct platform_device *pdev)
1354 {
1355 	struct mmc_host *mmc;
1356 	struct rtsx_usb_sdmmc *host;
1357 	struct rtsx_ucr *ucr;
1358 #ifdef RTSX_USB_USE_LEDS_CLASS
1359 	int err;
1360 #endif
1361 
1362 	ucr = usb_get_intfdata(to_usb_interface(pdev->dev.parent));
1363 	if (!ucr)
1364 		return -ENXIO;
1365 
1366 	dev_dbg(&(pdev->dev), ": Realtek USB SD/MMC controller found\n");
1367 
1368 	mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
1369 	if (!mmc)
1370 		return -ENOMEM;
1371 
1372 	host = mmc_priv(mmc);
1373 	host->ucr = ucr;
1374 	host->mmc = mmc;
1375 	host->pdev = pdev;
1376 	platform_set_drvdata(pdev, host);
1377 
1378 	mutex_init(&host->host_mutex);
1379 	rtsx_usb_init_host(host);
1380 	pm_runtime_enable(&pdev->dev);
1381 
1382 #ifdef RTSX_USB_USE_LEDS_CLASS
1383 	snprintf(host->led_name, sizeof(host->led_name),
1384 		"%s::", mmc_hostname(mmc));
1385 	host->led.name = host->led_name;
1386 	host->led.brightness = LED_OFF;
1387 	host->led.default_trigger = mmc_hostname(mmc);
1388 	host->led.brightness_set = rtsx_usb_led_control;
1389 
1390 	err = led_classdev_register(mmc_dev(mmc), &host->led);
1391 	if (err)
1392 		dev_err(&(pdev->dev),
1393 				"Failed to register LED device: %d\n", err);
1394 	INIT_WORK(&host->led_work, rtsx_usb_update_led);
1395 
1396 #endif
1397 	mmc_add_host(mmc);
1398 
1399 	return 0;
1400 }
1401 
1402 static int rtsx_usb_sdmmc_drv_remove(struct platform_device *pdev)
1403 {
1404 	struct rtsx_usb_sdmmc *host = platform_get_drvdata(pdev);
1405 	struct mmc_host *mmc;
1406 
1407 	if (!host)
1408 		return 0;
1409 
1410 	mmc = host->mmc;
1411 	host->host_removal = true;
1412 
1413 	mutex_lock(&host->host_mutex);
1414 	if (host->mrq) {
1415 		dev_dbg(&(pdev->dev),
1416 			"%s: Controller removed during transfer\n",
1417 			mmc_hostname(mmc));
1418 		host->mrq->cmd->error = -ENOMEDIUM;
1419 		if (host->mrq->stop)
1420 			host->mrq->stop->error = -ENOMEDIUM;
1421 		mmc_request_done(mmc, host->mrq);
1422 	}
1423 	mutex_unlock(&host->host_mutex);
1424 
1425 	mmc_remove_host(mmc);
1426 
1427 #ifdef RTSX_USB_USE_LEDS_CLASS
1428 	cancel_work_sync(&host->led_work);
1429 	led_classdev_unregister(&host->led);
1430 #endif
1431 
1432 	mmc_free_host(mmc);
1433 	pm_runtime_disable(&pdev->dev);
1434 	platform_set_drvdata(pdev, NULL);
1435 
1436 	dev_dbg(&(pdev->dev),
1437 		": Realtek USB SD/MMC module has been removed\n");
1438 
1439 	return 0;
1440 }
1441 
1442 static 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 	},
1458 };
1459 module_platform_driver(rtsx_usb_sdmmc_driver);
1460 
1461 MODULE_LICENSE("GPL v2");
1462 MODULE_AUTHOR("Roger Tseng <rogerable@realtek.com>");
1463 MODULE_DESCRIPTION("Realtek USB SD/MMC Card Host Driver");
1464