1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Realtek PCI-Express SD/MMC Card Interface driver
3  *
4  * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
5  *
6  * Author:
7  *   Wei WANG <wei_wang@realsil.com.cn>
8  */
9 
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/highmem.h>
13 #include <linux/delay.h>
14 #include <linux/platform_device.h>
15 #include <linux/workqueue.h>
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/mmc.h>
18 #include <linux/mmc/sd.h>
19 #include <linux/mmc/sdio.h>
20 #include <linux/mmc/card.h>
21 #include <linux/rtsx_pci.h>
22 #include <asm/unaligned.h>
23 #include <linux/pm_runtime.h>
24 
25 struct realtek_pci_sdmmc {
26 	struct platform_device	*pdev;
27 	struct rtsx_pcr		*pcr;
28 	struct mmc_host		*mmc;
29 	struct mmc_request	*mrq;
30 #define SDMMC_WORKQ_NAME	"rtsx_pci_sdmmc_workq"
31 
32 	struct work_struct	work;
33 	struct mutex		host_mutex;
34 
35 	u8			ssc_depth;
36 	unsigned int		clock;
37 	bool			vpclk;
38 	bool			double_clk;
39 	bool			eject;
40 	bool			initial_mode;
41 	int			prev_power_state;
42 	int			sg_count;
43 	s32			cookie;
44 	int			cookie_sg_count;
45 	bool			using_cookie;
46 };
47 
48 static int sdmmc_init_sd_express(struct mmc_host *mmc, struct mmc_ios *ios);
49 
50 static inline struct device *sdmmc_dev(struct realtek_pci_sdmmc *host)
51 {
52 	return &(host->pdev->dev);
53 }
54 
55 static inline void sd_clear_error(struct realtek_pci_sdmmc *host)
56 {
57 	rtsx_pci_write_register(host->pcr, CARD_STOP,
58 			SD_STOP | SD_CLR_ERR, SD_STOP | SD_CLR_ERR);
59 }
60 
61 #ifdef DEBUG
62 static void dump_reg_range(struct realtek_pci_sdmmc *host, u16 start, u16 end)
63 {
64 	u16 len = end - start + 1;
65 	int i;
66 	u8 data[8];
67 
68 	for (i = 0; i < len; i += 8) {
69 		int j;
70 		int n = min(8, len - i);
71 
72 		memset(&data, 0, sizeof(data));
73 		for (j = 0; j < n; j++)
74 			rtsx_pci_read_register(host->pcr, start + i + j,
75 				data + j);
76 		dev_dbg(sdmmc_dev(host), "0x%04X(%d): %8ph\n",
77 			start + i, n, data);
78 	}
79 }
80 
81 static void sd_print_debug_regs(struct realtek_pci_sdmmc *host)
82 {
83 	dump_reg_range(host, 0xFDA0, 0xFDB3);
84 	dump_reg_range(host, 0xFD52, 0xFD69);
85 }
86 #else
87 #define sd_print_debug_regs(host)
88 #endif /* DEBUG */
89 
90 static inline int sd_get_cd_int(struct realtek_pci_sdmmc *host)
91 {
92 	return rtsx_pci_readl(host->pcr, RTSX_BIPR) & SD_EXIST;
93 }
94 
95 static void sd_cmd_set_sd_cmd(struct rtsx_pcr *pcr, struct mmc_command *cmd)
96 {
97 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CMD0, 0xFF,
98 		SD_CMD_START | cmd->opcode);
99 	rtsx_pci_write_be32(pcr, SD_CMD1, cmd->arg);
100 }
101 
102 static void sd_cmd_set_data_len(struct rtsx_pcr *pcr, u16 blocks, u16 blksz)
103 {
104 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BLOCK_CNT_L, 0xFF, blocks);
105 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BLOCK_CNT_H, 0xFF, blocks >> 8);
106 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, blksz);
107 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BYTE_CNT_H, 0xFF, blksz >> 8);
108 }
109 
110 static int sd_response_type(struct mmc_command *cmd)
111 {
112 	switch (mmc_resp_type(cmd)) {
113 	case MMC_RSP_NONE:
114 		return SD_RSP_TYPE_R0;
115 	case MMC_RSP_R1:
116 		return SD_RSP_TYPE_R1;
117 	case MMC_RSP_R1_NO_CRC:
118 		return SD_RSP_TYPE_R1 | SD_NO_CHECK_CRC7;
119 	case MMC_RSP_R1B:
120 		return SD_RSP_TYPE_R1b;
121 	case MMC_RSP_R2:
122 		return SD_RSP_TYPE_R2;
123 	case MMC_RSP_R3:
124 		return SD_RSP_TYPE_R3;
125 	default:
126 		return -EINVAL;
127 	}
128 }
129 
130 static int sd_status_index(int resp_type)
131 {
132 	if (resp_type == SD_RSP_TYPE_R0)
133 		return 0;
134 	else if (resp_type == SD_RSP_TYPE_R2)
135 		return 16;
136 
137 	return 5;
138 }
139 /*
140  * sd_pre_dma_transfer - do dma_map_sg() or using cookie
141  *
142  * @pre: if called in pre_req()
143  * return:
144  *	0 - do dma_map_sg()
145  *	1 - using cookie
146  */
147 static int sd_pre_dma_transfer(struct realtek_pci_sdmmc *host,
148 		struct mmc_data *data, bool pre)
149 {
150 	struct rtsx_pcr *pcr = host->pcr;
151 	int read = data->flags & MMC_DATA_READ;
152 	int count = 0;
153 	int using_cookie = 0;
154 
155 	if (!pre && data->host_cookie && data->host_cookie != host->cookie) {
156 		dev_err(sdmmc_dev(host),
157 			"error: data->host_cookie = %d, host->cookie = %d\n",
158 			data->host_cookie, host->cookie);
159 		data->host_cookie = 0;
160 	}
161 
162 	if (pre || data->host_cookie != host->cookie) {
163 		count = rtsx_pci_dma_map_sg(pcr, data->sg, data->sg_len, read);
164 	} else {
165 		count = host->cookie_sg_count;
166 		using_cookie = 1;
167 	}
168 
169 	if (pre) {
170 		host->cookie_sg_count = count;
171 		if (++host->cookie < 0)
172 			host->cookie = 1;
173 		data->host_cookie = host->cookie;
174 	} else {
175 		host->sg_count = count;
176 	}
177 
178 	return using_cookie;
179 }
180 
181 static void sdmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
182 {
183 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
184 	struct mmc_data *data = mrq->data;
185 
186 	if (data->host_cookie) {
187 		dev_err(sdmmc_dev(host),
188 			"error: reset data->host_cookie = %d\n",
189 			data->host_cookie);
190 		data->host_cookie = 0;
191 	}
192 
193 	sd_pre_dma_transfer(host, data, true);
194 	dev_dbg(sdmmc_dev(host), "pre dma sg: %d\n", host->cookie_sg_count);
195 }
196 
197 static void sdmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
198 		int err)
199 {
200 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
201 	struct rtsx_pcr *pcr = host->pcr;
202 	struct mmc_data *data = mrq->data;
203 	int read = data->flags & MMC_DATA_READ;
204 
205 	rtsx_pci_dma_unmap_sg(pcr, data->sg, data->sg_len, read);
206 	data->host_cookie = 0;
207 }
208 
209 static void sd_send_cmd_get_rsp(struct realtek_pci_sdmmc *host,
210 		struct mmc_command *cmd)
211 {
212 	struct rtsx_pcr *pcr = host->pcr;
213 	u8 cmd_idx = (u8)cmd->opcode;
214 	u32 arg = cmd->arg;
215 	int err = 0;
216 	int timeout = 100;
217 	int i;
218 	u8 *ptr;
219 	int rsp_type;
220 	int stat_idx;
221 	bool clock_toggled = false;
222 
223 	dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
224 			__func__, cmd_idx, arg);
225 
226 	rsp_type = sd_response_type(cmd);
227 	if (rsp_type < 0)
228 		goto out;
229 
230 	stat_idx = sd_status_index(rsp_type);
231 
232 	if (rsp_type == SD_RSP_TYPE_R1b)
233 		timeout = cmd->busy_timeout ? cmd->busy_timeout : 3000;
234 
235 	if (cmd->opcode == SD_SWITCH_VOLTAGE) {
236 		err = rtsx_pci_write_register(pcr, SD_BUS_STAT,
237 				0xFF, SD_CLK_TOGGLE_EN);
238 		if (err < 0)
239 			goto out;
240 
241 		clock_toggled = true;
242 	}
243 
244 	rtsx_pci_init_cmd(pcr);
245 	sd_cmd_set_sd_cmd(pcr, cmd);
246 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF, rsp_type);
247 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_DATA_SOURCE,
248 			0x01, PINGPONG_BUFFER);
249 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER,
250 			0xFF, SD_TM_CMD_RSP | SD_TRANSFER_START);
251 	rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
252 		     SD_TRANSFER_END | SD_STAT_IDLE,
253 		     SD_TRANSFER_END | SD_STAT_IDLE);
254 
255 	if (rsp_type == SD_RSP_TYPE_R2) {
256 		/* Read data from ping-pong buffer */
257 		for (i = PPBUF_BASE2; i < PPBUF_BASE2 + 16; i++)
258 			rtsx_pci_add_cmd(pcr, READ_REG_CMD, (u16)i, 0, 0);
259 	} else if (rsp_type != SD_RSP_TYPE_R0) {
260 		/* Read data from SD_CMDx registers */
261 		for (i = SD_CMD0; i <= SD_CMD4; i++)
262 			rtsx_pci_add_cmd(pcr, READ_REG_CMD, (u16)i, 0, 0);
263 	}
264 
265 	rtsx_pci_add_cmd(pcr, READ_REG_CMD, SD_STAT1, 0, 0);
266 
267 	err = rtsx_pci_send_cmd(pcr, timeout);
268 	if (err < 0) {
269 		sd_print_debug_regs(host);
270 		sd_clear_error(host);
271 		dev_dbg(sdmmc_dev(host),
272 			"rtsx_pci_send_cmd error (err = %d)\n", err);
273 		goto out;
274 	}
275 
276 	if (rsp_type == SD_RSP_TYPE_R0) {
277 		err = 0;
278 		goto out;
279 	}
280 
281 	/* Eliminate returned value of CHECK_REG_CMD */
282 	ptr = rtsx_pci_get_cmd_data(pcr) + 1;
283 
284 	/* Check (Start,Transmission) bit of Response */
285 	if ((ptr[0] & 0xC0) != 0) {
286 		err = -EILSEQ;
287 		dev_dbg(sdmmc_dev(host), "Invalid response bit\n");
288 		goto out;
289 	}
290 
291 	/* Check CRC7 */
292 	if (!(rsp_type & SD_NO_CHECK_CRC7)) {
293 		if (ptr[stat_idx] & SD_CRC7_ERR) {
294 			err = -EILSEQ;
295 			dev_dbg(sdmmc_dev(host), "CRC7 error\n");
296 			goto out;
297 		}
298 	}
299 
300 	if (rsp_type == SD_RSP_TYPE_R2) {
301 		/*
302 		 * The controller offloads the last byte {CRC-7, end bit 1'b1}
303 		 * of response type R2. Assign dummy CRC, 0, and end bit to the
304 		 * byte(ptr[16], goes into the LSB of resp[3] later).
305 		 */
306 		ptr[16] = 1;
307 
308 		for (i = 0; i < 4; i++) {
309 			cmd->resp[i] = get_unaligned_be32(ptr + 1 + i * 4);
310 			dev_dbg(sdmmc_dev(host), "cmd->resp[%d] = 0x%08x\n",
311 					i, cmd->resp[i]);
312 		}
313 	} else {
314 		cmd->resp[0] = get_unaligned_be32(ptr + 1);
315 		dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
316 				cmd->resp[0]);
317 	}
318 
319 out:
320 	cmd->error = err;
321 
322 	if (err && clock_toggled)
323 		rtsx_pci_write_register(pcr, SD_BUS_STAT,
324 				SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
325 }
326 
327 static int sd_read_data(struct realtek_pci_sdmmc *host, struct mmc_command *cmd,
328 	u16 byte_cnt, u8 *buf, int buf_len, int timeout)
329 {
330 	struct rtsx_pcr *pcr = host->pcr;
331 	int err;
332 	u8 trans_mode;
333 
334 	dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
335 		__func__, cmd->opcode, cmd->arg);
336 
337 	if (!buf)
338 		buf_len = 0;
339 
340 	if (cmd->opcode == MMC_SEND_TUNING_BLOCK)
341 		trans_mode = SD_TM_AUTO_TUNING;
342 	else
343 		trans_mode = SD_TM_NORMAL_READ;
344 
345 	rtsx_pci_init_cmd(pcr);
346 	sd_cmd_set_sd_cmd(pcr, cmd);
347 	sd_cmd_set_data_len(pcr, 1, byte_cnt);
348 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF,
349 			SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
350 			SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_6);
351 	if (trans_mode != SD_TM_AUTO_TUNING)
352 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
353 				CARD_DATA_SOURCE, 0x01, PINGPONG_BUFFER);
354 
355 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER,
356 			0xFF, trans_mode | SD_TRANSFER_START);
357 	rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
358 			SD_TRANSFER_END, SD_TRANSFER_END);
359 
360 	err = rtsx_pci_send_cmd(pcr, timeout);
361 	if (err < 0) {
362 		sd_print_debug_regs(host);
363 		dev_dbg(sdmmc_dev(host),
364 			"rtsx_pci_send_cmd fail (err = %d)\n", err);
365 		return err;
366 	}
367 
368 	if (buf && buf_len) {
369 		err = rtsx_pci_read_ppbuf(pcr, buf, buf_len);
370 		if (err < 0) {
371 			dev_dbg(sdmmc_dev(host),
372 				"rtsx_pci_read_ppbuf fail (err = %d)\n", err);
373 			return err;
374 		}
375 	}
376 
377 	return 0;
378 }
379 
380 static int sd_write_data(struct realtek_pci_sdmmc *host,
381 	struct mmc_command *cmd, u16 byte_cnt, u8 *buf, int buf_len,
382 	int timeout)
383 {
384 	struct rtsx_pcr *pcr = host->pcr;
385 	int err;
386 
387 	dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
388 		__func__, cmd->opcode, cmd->arg);
389 
390 	if (!buf)
391 		buf_len = 0;
392 
393 	sd_send_cmd_get_rsp(host, cmd);
394 	if (cmd->error)
395 		return cmd->error;
396 
397 	if (buf && buf_len) {
398 		err = rtsx_pci_write_ppbuf(pcr, buf, buf_len);
399 		if (err < 0) {
400 			dev_dbg(sdmmc_dev(host),
401 				"rtsx_pci_write_ppbuf fail (err = %d)\n", err);
402 			return err;
403 		}
404 	}
405 
406 	rtsx_pci_init_cmd(pcr);
407 	sd_cmd_set_data_len(pcr, 1, byte_cnt);
408 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF,
409 		SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
410 		SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_0);
411 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
412 			SD_TRANSFER_START | SD_TM_AUTO_WRITE_3);
413 	rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
414 			SD_TRANSFER_END, SD_TRANSFER_END);
415 
416 	err = rtsx_pci_send_cmd(pcr, timeout);
417 	if (err < 0) {
418 		sd_print_debug_regs(host);
419 		dev_dbg(sdmmc_dev(host),
420 			"rtsx_pci_send_cmd fail (err = %d)\n", err);
421 		return err;
422 	}
423 
424 	return 0;
425 }
426 
427 static int sd_read_long_data(struct realtek_pci_sdmmc *host,
428 	struct mmc_request *mrq)
429 {
430 	struct rtsx_pcr *pcr = host->pcr;
431 	struct mmc_host *mmc = host->mmc;
432 	struct mmc_card *card = mmc->card;
433 	struct mmc_command *cmd = mrq->cmd;
434 	struct mmc_data *data = mrq->data;
435 	int uhs = mmc_card_uhs(card);
436 	u8 cfg2 = 0;
437 	int err;
438 	int resp_type;
439 	size_t data_len = data->blksz * data->blocks;
440 
441 	dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
442 		__func__, cmd->opcode, cmd->arg);
443 
444 	resp_type = sd_response_type(cmd);
445 	if (resp_type < 0)
446 		return resp_type;
447 
448 	if (!uhs)
449 		cfg2 |= SD_NO_CHECK_WAIT_CRC_TO;
450 
451 	rtsx_pci_init_cmd(pcr);
452 	sd_cmd_set_sd_cmd(pcr, cmd);
453 	sd_cmd_set_data_len(pcr, data->blocks, data->blksz);
454 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, IRQSTAT0,
455 			DMA_DONE_INT, DMA_DONE_INT);
456 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC3,
457 		0xFF, (u8)(data_len >> 24));
458 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC2,
459 		0xFF, (u8)(data_len >> 16));
460 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC1,
461 		0xFF, (u8)(data_len >> 8));
462 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC0, 0xFF, (u8)data_len);
463 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMACTL,
464 		0x03 | DMA_PACK_SIZE_MASK,
465 		DMA_DIR_FROM_CARD | DMA_EN | DMA_512);
466 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_DATA_SOURCE,
467 			0x01, RING_BUFFER);
468 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2 | resp_type);
469 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
470 			SD_TRANSFER_START | SD_TM_AUTO_READ_2);
471 	rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
472 			SD_TRANSFER_END, SD_TRANSFER_END);
473 	rtsx_pci_send_cmd_no_wait(pcr);
474 
475 	err = rtsx_pci_dma_transfer(pcr, data->sg, host->sg_count, 1, 10000);
476 	if (err < 0) {
477 		sd_print_debug_regs(host);
478 		sd_clear_error(host);
479 		return err;
480 	}
481 
482 	return 0;
483 }
484 
485 static int sd_write_long_data(struct realtek_pci_sdmmc *host,
486 	struct mmc_request *mrq)
487 {
488 	struct rtsx_pcr *pcr = host->pcr;
489 	struct mmc_host *mmc = host->mmc;
490 	struct mmc_card *card = mmc->card;
491 	struct mmc_command *cmd = mrq->cmd;
492 	struct mmc_data *data = mrq->data;
493 	int uhs = mmc_card_uhs(card);
494 	u8 cfg2;
495 	int err;
496 	size_t data_len = data->blksz * data->blocks;
497 
498 	sd_send_cmd_get_rsp(host, cmd);
499 	if (cmd->error)
500 		return cmd->error;
501 
502 	dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
503 		__func__, cmd->opcode, cmd->arg);
504 
505 	cfg2 = SD_NO_CALCULATE_CRC7 | SD_CHECK_CRC16 |
506 		SD_NO_WAIT_BUSY_END | SD_NO_CHECK_CRC7 | SD_RSP_LEN_0;
507 
508 	if (!uhs)
509 		cfg2 |= SD_NO_CHECK_WAIT_CRC_TO;
510 
511 	rtsx_pci_init_cmd(pcr);
512 	sd_cmd_set_data_len(pcr, data->blocks, data->blksz);
513 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, IRQSTAT0,
514 			DMA_DONE_INT, DMA_DONE_INT);
515 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC3,
516 		0xFF, (u8)(data_len >> 24));
517 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC2,
518 		0xFF, (u8)(data_len >> 16));
519 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC1,
520 		0xFF, (u8)(data_len >> 8));
521 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC0, 0xFF, (u8)data_len);
522 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMACTL,
523 		0x03 | DMA_PACK_SIZE_MASK,
524 		DMA_DIR_TO_CARD | DMA_EN | DMA_512);
525 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_DATA_SOURCE,
526 			0x01, RING_BUFFER);
527 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2);
528 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
529 			SD_TRANSFER_START | SD_TM_AUTO_WRITE_3);
530 	rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
531 			SD_TRANSFER_END, SD_TRANSFER_END);
532 	rtsx_pci_send_cmd_no_wait(pcr);
533 	err = rtsx_pci_dma_transfer(pcr, data->sg, host->sg_count, 0, 10000);
534 	if (err < 0) {
535 		sd_clear_error(host);
536 		return err;
537 	}
538 
539 	return 0;
540 }
541 
542 static inline void sd_enable_initial_mode(struct realtek_pci_sdmmc *host)
543 {
544 	rtsx_pci_write_register(host->pcr, SD_CFG1,
545 			SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_128);
546 }
547 
548 static inline void sd_disable_initial_mode(struct realtek_pci_sdmmc *host)
549 {
550 	rtsx_pci_write_register(host->pcr, SD_CFG1,
551 			SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_0);
552 }
553 
554 static int sd_rw_multi(struct realtek_pci_sdmmc *host, struct mmc_request *mrq)
555 {
556 	struct mmc_data *data = mrq->data;
557 	int err;
558 
559 	if (host->sg_count < 0) {
560 		data->error = host->sg_count;
561 		dev_dbg(sdmmc_dev(host), "%s: sg_count = %d is invalid\n",
562 			__func__, host->sg_count);
563 		return data->error;
564 	}
565 
566 	if (data->flags & MMC_DATA_READ) {
567 		if (host->initial_mode)
568 			sd_disable_initial_mode(host);
569 
570 		err = sd_read_long_data(host, mrq);
571 
572 		if (host->initial_mode)
573 			sd_enable_initial_mode(host);
574 
575 		return err;
576 	}
577 
578 	return sd_write_long_data(host, mrq);
579 }
580 
581 static void sd_normal_rw(struct realtek_pci_sdmmc *host,
582 		struct mmc_request *mrq)
583 {
584 	struct mmc_command *cmd = mrq->cmd;
585 	struct mmc_data *data = mrq->data;
586 	u8 *buf;
587 
588 	buf = kzalloc(data->blksz, GFP_NOIO);
589 	if (!buf) {
590 		cmd->error = -ENOMEM;
591 		return;
592 	}
593 
594 	if (data->flags & MMC_DATA_READ) {
595 		if (host->initial_mode)
596 			sd_disable_initial_mode(host);
597 
598 		cmd->error = sd_read_data(host, cmd, (u16)data->blksz, buf,
599 				data->blksz, 200);
600 
601 		if (host->initial_mode)
602 			sd_enable_initial_mode(host);
603 
604 		sg_copy_from_buffer(data->sg, data->sg_len, buf, data->blksz);
605 	} else {
606 		sg_copy_to_buffer(data->sg, data->sg_len, buf, data->blksz);
607 
608 		cmd->error = sd_write_data(host, cmd, (u16)data->blksz, buf,
609 				data->blksz, 200);
610 	}
611 
612 	kfree(buf);
613 }
614 
615 static int sd_change_phase(struct realtek_pci_sdmmc *host,
616 		u8 sample_point, bool rx)
617 {
618 	struct rtsx_pcr *pcr = host->pcr;
619 	u16 SD_VP_CTL = 0;
620 	dev_dbg(sdmmc_dev(host), "%s(%s): sample_point = %d\n",
621 			__func__, rx ? "RX" : "TX", sample_point);
622 
623 	rtsx_pci_write_register(pcr, CLK_CTL, CHANGE_CLK, CHANGE_CLK);
624 	if (rx) {
625 		SD_VP_CTL = SD_VPRX_CTL;
626 		rtsx_pci_write_register(pcr, SD_VPRX_CTL,
627 			PHASE_SELECT_MASK, sample_point);
628 	} else {
629 		SD_VP_CTL = SD_VPTX_CTL;
630 		rtsx_pci_write_register(pcr, SD_VPTX_CTL,
631 			PHASE_SELECT_MASK, sample_point);
632 	}
633 	rtsx_pci_write_register(pcr, SD_VP_CTL, PHASE_NOT_RESET, 0);
634 	rtsx_pci_write_register(pcr, SD_VP_CTL, PHASE_NOT_RESET,
635 				PHASE_NOT_RESET);
636 	rtsx_pci_write_register(pcr, CLK_CTL, CHANGE_CLK, 0);
637 	rtsx_pci_write_register(pcr, SD_CFG1, SD_ASYNC_FIFO_NOT_RST, 0);
638 
639 	return 0;
640 }
641 
642 static inline u32 test_phase_bit(u32 phase_map, unsigned int bit)
643 {
644 	bit %= RTSX_PHASE_MAX;
645 	return phase_map & (1 << bit);
646 }
647 
648 static int sd_get_phase_len(u32 phase_map, unsigned int start_bit)
649 {
650 	int i;
651 
652 	for (i = 0; i < RTSX_PHASE_MAX; i++) {
653 		if (test_phase_bit(phase_map, start_bit + i) == 0)
654 			return i;
655 	}
656 	return RTSX_PHASE_MAX;
657 }
658 
659 static u8 sd_search_final_phase(struct realtek_pci_sdmmc *host, u32 phase_map)
660 {
661 	int start = 0, len = 0;
662 	int start_final = 0, len_final = 0;
663 	u8 final_phase = 0xFF;
664 
665 	if (phase_map == 0) {
666 		dev_err(sdmmc_dev(host), "phase error: [map:%x]\n", phase_map);
667 		return final_phase;
668 	}
669 
670 	while (start < RTSX_PHASE_MAX) {
671 		len = sd_get_phase_len(phase_map, start);
672 		if (len_final < len) {
673 			start_final = start;
674 			len_final = len;
675 		}
676 		start += len ? len : 1;
677 	}
678 
679 	final_phase = (start_final + len_final / 2) % RTSX_PHASE_MAX;
680 	dev_dbg(sdmmc_dev(host), "phase: [map:%x] [maxlen:%d] [final:%d]\n",
681 		phase_map, len_final, final_phase);
682 
683 	return final_phase;
684 }
685 
686 static void sd_wait_data_idle(struct realtek_pci_sdmmc *host)
687 {
688 	int i;
689 	u8 val = 0;
690 
691 	for (i = 0; i < 100; i++) {
692 		rtsx_pci_read_register(host->pcr, SD_DATA_STATE, &val);
693 		if (val & SD_DATA_IDLE)
694 			return;
695 
696 		udelay(100);
697 	}
698 }
699 
700 static int sd_tuning_rx_cmd(struct realtek_pci_sdmmc *host,
701 		u8 opcode, u8 sample_point)
702 {
703 	int err;
704 	struct mmc_command cmd = {};
705 	struct rtsx_pcr *pcr = host->pcr;
706 
707 	sd_change_phase(host, sample_point, true);
708 
709 	rtsx_pci_write_register(pcr, SD_CFG3, SD_RSP_80CLK_TIMEOUT_EN,
710 		SD_RSP_80CLK_TIMEOUT_EN);
711 
712 	cmd.opcode = opcode;
713 	err = sd_read_data(host, &cmd, 0x40, NULL, 0, 100);
714 	if (err < 0) {
715 		/* Wait till SD DATA IDLE */
716 		sd_wait_data_idle(host);
717 		sd_clear_error(host);
718 		rtsx_pci_write_register(pcr, SD_CFG3,
719 			SD_RSP_80CLK_TIMEOUT_EN, 0);
720 		return err;
721 	}
722 
723 	rtsx_pci_write_register(pcr, SD_CFG3, SD_RSP_80CLK_TIMEOUT_EN, 0);
724 	return 0;
725 }
726 
727 static int sd_tuning_phase(struct realtek_pci_sdmmc *host,
728 		u8 opcode, u32 *phase_map)
729 {
730 	int err, i;
731 	u32 raw_phase_map = 0;
732 
733 	for (i = 0; i < RTSX_PHASE_MAX; i++) {
734 		err = sd_tuning_rx_cmd(host, opcode, (u8)i);
735 		if (err == 0)
736 			raw_phase_map |= 1 << i;
737 	}
738 
739 	if (phase_map)
740 		*phase_map = raw_phase_map;
741 
742 	return 0;
743 }
744 
745 static int sd_tuning_rx(struct realtek_pci_sdmmc *host, u8 opcode)
746 {
747 	int err, i;
748 	u32 raw_phase_map[RX_TUNING_CNT] = {0}, phase_map;
749 	u8 final_phase;
750 
751 	for (i = 0; i < RX_TUNING_CNT; i++) {
752 		err = sd_tuning_phase(host, opcode, &(raw_phase_map[i]));
753 		if (err < 0)
754 			return err;
755 
756 		if (raw_phase_map[i] == 0)
757 			break;
758 	}
759 
760 	phase_map = 0xFFFFFFFF;
761 	for (i = 0; i < RX_TUNING_CNT; i++) {
762 		dev_dbg(sdmmc_dev(host), "RX raw_phase_map[%d] = 0x%08x\n",
763 				i, raw_phase_map[i]);
764 		phase_map &= raw_phase_map[i];
765 	}
766 	dev_dbg(sdmmc_dev(host), "RX phase_map = 0x%08x\n", phase_map);
767 
768 	if (phase_map) {
769 		final_phase = sd_search_final_phase(host, phase_map);
770 		if (final_phase == 0xFF)
771 			return -EINVAL;
772 
773 		err = sd_change_phase(host, final_phase, true);
774 		if (err < 0)
775 			return err;
776 	} else {
777 		return -EINVAL;
778 	}
779 
780 	return 0;
781 }
782 
783 static inline int sdio_extblock_cmd(struct mmc_command *cmd,
784 	struct mmc_data *data)
785 {
786 	return (cmd->opcode == SD_IO_RW_EXTENDED) && (data->blksz == 512);
787 }
788 
789 static inline int sd_rw_cmd(struct mmc_command *cmd)
790 {
791 	return mmc_op_multi(cmd->opcode) ||
792 		(cmd->opcode == MMC_READ_SINGLE_BLOCK) ||
793 		(cmd->opcode == MMC_WRITE_BLOCK);
794 }
795 
796 static void sd_request(struct work_struct *work)
797 {
798 	struct realtek_pci_sdmmc *host = container_of(work,
799 			struct realtek_pci_sdmmc, work);
800 	struct rtsx_pcr *pcr = host->pcr;
801 
802 	struct mmc_host *mmc = host->mmc;
803 	struct mmc_request *mrq = host->mrq;
804 	struct mmc_command *cmd = mrq->cmd;
805 	struct mmc_data *data = mrq->data;
806 
807 	unsigned int data_size = 0;
808 	int err;
809 
810 	if (host->eject || !sd_get_cd_int(host)) {
811 		cmd->error = -ENOMEDIUM;
812 		goto finish;
813 	}
814 
815 	err = rtsx_pci_card_exclusive_check(host->pcr, RTSX_SD_CARD);
816 	if (err) {
817 		cmd->error = err;
818 		goto finish;
819 	}
820 
821 	mutex_lock(&pcr->pcr_mutex);
822 
823 	rtsx_pci_start_run(pcr);
824 
825 	rtsx_pci_switch_clock(pcr, host->clock, host->ssc_depth,
826 			host->initial_mode, host->double_clk, host->vpclk);
827 	rtsx_pci_write_register(pcr, CARD_SELECT, 0x07, SD_MOD_SEL);
828 	rtsx_pci_write_register(pcr, CARD_SHARE_MODE,
829 			CARD_SHARE_MASK, CARD_SHARE_48_SD);
830 
831 	mutex_lock(&host->host_mutex);
832 	host->mrq = mrq;
833 	mutex_unlock(&host->host_mutex);
834 
835 	if (mrq->data)
836 		data_size = data->blocks * data->blksz;
837 
838 	if (!data_size) {
839 		sd_send_cmd_get_rsp(host, cmd);
840 	} else if (sd_rw_cmd(cmd) || sdio_extblock_cmd(cmd, data)) {
841 		cmd->error = sd_rw_multi(host, mrq);
842 		if (!host->using_cookie)
843 			sdmmc_post_req(host->mmc, host->mrq, 0);
844 
845 		if (mmc_op_multi(cmd->opcode) && mrq->stop)
846 			sd_send_cmd_get_rsp(host, mrq->stop);
847 	} else {
848 		sd_normal_rw(host, mrq);
849 	}
850 
851 	if (mrq->data) {
852 		if (cmd->error || data->error)
853 			data->bytes_xfered = 0;
854 		else
855 			data->bytes_xfered = data->blocks * data->blksz;
856 	}
857 
858 	mutex_unlock(&pcr->pcr_mutex);
859 
860 finish:
861 	if (cmd->error) {
862 		dev_dbg(sdmmc_dev(host), "CMD %d 0x%08x error(%d)\n",
863 			cmd->opcode, cmd->arg, cmd->error);
864 	}
865 
866 	mutex_lock(&host->host_mutex);
867 	host->mrq = NULL;
868 	mutex_unlock(&host->host_mutex);
869 
870 	mmc_request_done(mmc, mrq);
871 }
872 
873 static void sdmmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
874 {
875 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
876 	struct mmc_data *data = mrq->data;
877 
878 	mutex_lock(&host->host_mutex);
879 	host->mrq = mrq;
880 	mutex_unlock(&host->host_mutex);
881 
882 	if (sd_rw_cmd(mrq->cmd) || sdio_extblock_cmd(mrq->cmd, data))
883 		host->using_cookie = sd_pre_dma_transfer(host, data, false);
884 
885 	schedule_work(&host->work);
886 }
887 
888 static int sd_set_bus_width(struct realtek_pci_sdmmc *host,
889 		unsigned char bus_width)
890 {
891 	int err = 0;
892 	u8 width[] = {
893 		[MMC_BUS_WIDTH_1] = SD_BUS_WIDTH_1BIT,
894 		[MMC_BUS_WIDTH_4] = SD_BUS_WIDTH_4BIT,
895 		[MMC_BUS_WIDTH_8] = SD_BUS_WIDTH_8BIT,
896 	};
897 
898 	if (bus_width <= MMC_BUS_WIDTH_8)
899 		err = rtsx_pci_write_register(host->pcr, SD_CFG1,
900 				0x03, width[bus_width]);
901 
902 	return err;
903 }
904 
905 static int sd_power_on(struct realtek_pci_sdmmc *host, unsigned char power_mode)
906 {
907 	struct rtsx_pcr *pcr = host->pcr;
908 	struct mmc_host *mmc = host->mmc;
909 	int err;
910 	u32 val;
911 	u8 test_mode;
912 
913 	if (host->prev_power_state == MMC_POWER_ON)
914 		return 0;
915 
916 	if (host->prev_power_state == MMC_POWER_UP) {
917 		rtsx_pci_write_register(pcr, SD_BUS_STAT, SD_CLK_TOGGLE_EN, 0);
918 		goto finish;
919 	}
920 
921 	msleep(100);
922 
923 	rtsx_pci_init_cmd(pcr);
924 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SELECT, 0x07, SD_MOD_SEL);
925 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SHARE_MODE,
926 			CARD_SHARE_MASK, CARD_SHARE_48_SD);
927 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_EN,
928 			SD_CLK_EN, SD_CLK_EN);
929 	err = rtsx_pci_send_cmd(pcr, 100);
930 	if (err < 0)
931 		return err;
932 
933 	err = rtsx_pci_card_pull_ctl_enable(pcr, RTSX_SD_CARD);
934 	if (err < 0)
935 		return err;
936 
937 	err = rtsx_pci_card_power_on(pcr, RTSX_SD_CARD);
938 	if (err < 0)
939 		return err;
940 
941 	mdelay(1);
942 
943 	err = rtsx_pci_write_register(pcr, CARD_OE, SD_OUTPUT_EN, SD_OUTPUT_EN);
944 	if (err < 0)
945 		return err;
946 
947 	/* send at least 74 clocks */
948 	rtsx_pci_write_register(pcr, SD_BUS_STAT, SD_CLK_TOGGLE_EN, SD_CLK_TOGGLE_EN);
949 
950 	if (PCI_PID(pcr) == PID_5261) {
951 		/*
952 		 * If test mode is set switch to SD Express mandatorily,
953 		 * this is only for factory testing.
954 		 */
955 		rtsx_pci_read_register(pcr, RTS5261_FW_CFG_INFO0, &test_mode);
956 		if (test_mode & RTS5261_FW_EXPRESS_TEST_MASK) {
957 			sdmmc_init_sd_express(mmc, NULL);
958 			return 0;
959 		}
960 		if (pcr->extra_caps & EXTRA_CAPS_SD_EXPRESS)
961 			mmc->caps2 |= MMC_CAP2_SD_EXP | MMC_CAP2_SD_EXP_1_2V;
962 		/*
963 		 * HW read wp status when resuming from S3/S4,
964 		 * and then picks SD legacy interface if it's set
965 		 * in read-only mode.
966 		 */
967 		val = rtsx_pci_readl(pcr, RTSX_BIPR);
968 		if (val & SD_WRITE_PROTECT) {
969 			pcr->extra_caps &= ~EXTRA_CAPS_SD_EXPRESS;
970 			mmc->caps2 &= ~(MMC_CAP2_SD_EXP | MMC_CAP2_SD_EXP_1_2V);
971 		}
972 	}
973 
974 finish:
975 	host->prev_power_state = power_mode;
976 	return 0;
977 }
978 
979 static int sd_power_off(struct realtek_pci_sdmmc *host)
980 {
981 	struct rtsx_pcr *pcr = host->pcr;
982 	int err;
983 
984 	host->prev_power_state = MMC_POWER_OFF;
985 
986 	rtsx_pci_init_cmd(pcr);
987 
988 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_EN, SD_CLK_EN, 0);
989 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_OE, SD_OUTPUT_EN, 0);
990 
991 	err = rtsx_pci_send_cmd(pcr, 100);
992 	if (err < 0)
993 		return err;
994 
995 	err = rtsx_pci_card_power_off(pcr, RTSX_SD_CARD);
996 	if (err < 0)
997 		return err;
998 
999 	return rtsx_pci_card_pull_ctl_disable(pcr, RTSX_SD_CARD);
1000 }
1001 
1002 static int sd_set_power_mode(struct realtek_pci_sdmmc *host,
1003 		unsigned char power_mode)
1004 {
1005 	int err;
1006 
1007 	if (power_mode == MMC_POWER_OFF)
1008 		err = sd_power_off(host);
1009 	else
1010 		err = sd_power_on(host, power_mode);
1011 
1012 	return err;
1013 }
1014 
1015 static int sd_set_timing(struct realtek_pci_sdmmc *host, unsigned char timing)
1016 {
1017 	struct rtsx_pcr *pcr = host->pcr;
1018 	int err = 0;
1019 
1020 	rtsx_pci_init_cmd(pcr);
1021 
1022 	switch (timing) {
1023 	case MMC_TIMING_UHS_SDR104:
1024 	case MMC_TIMING_UHS_SDR50:
1025 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG1,
1026 				0x0C | SD_ASYNC_FIFO_NOT_RST,
1027 				SD_30_MODE | SD_ASYNC_FIFO_NOT_RST);
1028 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
1029 				CLK_LOW_FREQ, CLK_LOW_FREQ);
1030 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1031 				CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
1032 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL, CLK_LOW_FREQ, 0);
1033 		break;
1034 
1035 	case MMC_TIMING_MMC_DDR52:
1036 	case MMC_TIMING_UHS_DDR50:
1037 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG1,
1038 				0x0C | SD_ASYNC_FIFO_NOT_RST,
1039 				SD_DDR_MODE | SD_ASYNC_FIFO_NOT_RST);
1040 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
1041 				CLK_LOW_FREQ, CLK_LOW_FREQ);
1042 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1043 				CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
1044 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL, CLK_LOW_FREQ, 0);
1045 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1046 				DDR_VAR_TX_CMD_DAT, DDR_VAR_TX_CMD_DAT);
1047 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1048 				DDR_VAR_RX_DAT | DDR_VAR_RX_CMD,
1049 				DDR_VAR_RX_DAT | DDR_VAR_RX_CMD);
1050 		break;
1051 
1052 	case MMC_TIMING_MMC_HS:
1053 	case MMC_TIMING_SD_HS:
1054 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG1,
1055 				0x0C, SD_20_MODE);
1056 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
1057 				CLK_LOW_FREQ, CLK_LOW_FREQ);
1058 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1059 				CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1060 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL, CLK_LOW_FREQ, 0);
1061 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1062 				SD20_TX_SEL_MASK, SD20_TX_14_AHEAD);
1063 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1064 				SD20_RX_SEL_MASK, SD20_RX_14_DELAY);
1065 		break;
1066 
1067 	default:
1068 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
1069 				SD_CFG1, 0x0C, SD_20_MODE);
1070 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
1071 				CLK_LOW_FREQ, CLK_LOW_FREQ);
1072 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1073 				CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1074 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL, CLK_LOW_FREQ, 0);
1075 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
1076 				SD_PUSH_POINT_CTL, 0xFF, 0);
1077 		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1078 				SD20_RX_SEL_MASK, SD20_RX_POS_EDGE);
1079 		break;
1080 	}
1081 
1082 	err = rtsx_pci_send_cmd(pcr, 100);
1083 
1084 	return err;
1085 }
1086 
1087 static void sdmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1088 {
1089 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
1090 	struct rtsx_pcr *pcr = host->pcr;
1091 
1092 	if (host->eject)
1093 		return;
1094 
1095 	if (rtsx_pci_card_exclusive_check(host->pcr, RTSX_SD_CARD))
1096 		return;
1097 
1098 	mutex_lock(&pcr->pcr_mutex);
1099 
1100 	rtsx_pci_start_run(pcr);
1101 
1102 	sd_set_bus_width(host, ios->bus_width);
1103 	sd_set_power_mode(host, ios->power_mode);
1104 	sd_set_timing(host, ios->timing);
1105 
1106 	host->vpclk = false;
1107 	host->double_clk = true;
1108 
1109 	switch (ios->timing) {
1110 	case MMC_TIMING_UHS_SDR104:
1111 	case MMC_TIMING_UHS_SDR50:
1112 		host->ssc_depth = RTSX_SSC_DEPTH_2M;
1113 		host->vpclk = true;
1114 		host->double_clk = false;
1115 		break;
1116 	case MMC_TIMING_MMC_DDR52:
1117 	case MMC_TIMING_UHS_DDR50:
1118 	case MMC_TIMING_UHS_SDR25:
1119 		host->ssc_depth = RTSX_SSC_DEPTH_1M;
1120 		break;
1121 	default:
1122 		host->ssc_depth = RTSX_SSC_DEPTH_500K;
1123 		break;
1124 	}
1125 
1126 	host->initial_mode = (ios->clock <= 1000000) ? true : false;
1127 
1128 	host->clock = ios->clock;
1129 	rtsx_pci_switch_clock(pcr, ios->clock, host->ssc_depth,
1130 			host->initial_mode, host->double_clk, host->vpclk);
1131 
1132 	mutex_unlock(&pcr->pcr_mutex);
1133 }
1134 
1135 static int sdmmc_get_ro(struct mmc_host *mmc)
1136 {
1137 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
1138 	struct rtsx_pcr *pcr = host->pcr;
1139 	int ro = 0;
1140 	u32 val;
1141 
1142 	if (host->eject)
1143 		return -ENOMEDIUM;
1144 
1145 	mutex_lock(&pcr->pcr_mutex);
1146 
1147 	rtsx_pci_start_run(pcr);
1148 
1149 	/* Check SD mechanical write-protect switch */
1150 	val = rtsx_pci_readl(pcr, RTSX_BIPR);
1151 	dev_dbg(sdmmc_dev(host), "%s: RTSX_BIPR = 0x%08x\n", __func__, val);
1152 	if (val & SD_WRITE_PROTECT)
1153 		ro = 1;
1154 
1155 	mutex_unlock(&pcr->pcr_mutex);
1156 
1157 	return ro;
1158 }
1159 
1160 static int sdmmc_get_cd(struct mmc_host *mmc)
1161 {
1162 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
1163 	struct rtsx_pcr *pcr = host->pcr;
1164 	int cd = 0;
1165 	u32 val;
1166 
1167 	if (host->eject)
1168 		return cd;
1169 
1170 	mutex_lock(&pcr->pcr_mutex);
1171 
1172 	rtsx_pci_start_run(pcr);
1173 
1174 	/* Check SD card detect */
1175 	val = rtsx_pci_card_exist(pcr);
1176 	dev_dbg(sdmmc_dev(host), "%s: RTSX_BIPR = 0x%08x\n", __func__, val);
1177 	if (val & SD_EXIST)
1178 		cd = 1;
1179 
1180 	mutex_unlock(&pcr->pcr_mutex);
1181 
1182 	return cd;
1183 }
1184 
1185 static int sd_wait_voltage_stable_1(struct realtek_pci_sdmmc *host)
1186 {
1187 	struct rtsx_pcr *pcr = host->pcr;
1188 	int err;
1189 	u8 stat;
1190 
1191 	/* Reference to Signal Voltage Switch Sequence in SD spec.
1192 	 * Wait for a period of time so that the card can drive SD_CMD and
1193 	 * SD_DAT[3:0] to low after sending back CMD11 response.
1194 	 */
1195 	mdelay(1);
1196 
1197 	/* SD_CMD, SD_DAT[3:0] should be driven to low by card;
1198 	 * If either one of SD_CMD,SD_DAT[3:0] is not low,
1199 	 * abort the voltage switch sequence;
1200 	 */
1201 	err = rtsx_pci_read_register(pcr, SD_BUS_STAT, &stat);
1202 	if (err < 0)
1203 		return err;
1204 
1205 	if (stat & (SD_CMD_STATUS | SD_DAT3_STATUS | SD_DAT2_STATUS |
1206 				SD_DAT1_STATUS | SD_DAT0_STATUS))
1207 		return -EINVAL;
1208 
1209 	/* Stop toggle SD clock */
1210 	err = rtsx_pci_write_register(pcr, SD_BUS_STAT,
1211 			0xFF, SD_CLK_FORCE_STOP);
1212 	if (err < 0)
1213 		return err;
1214 
1215 	return 0;
1216 }
1217 
1218 static int sd_wait_voltage_stable_2(struct realtek_pci_sdmmc *host)
1219 {
1220 	struct rtsx_pcr *pcr = host->pcr;
1221 	int err;
1222 	u8 stat, mask, val;
1223 
1224 	/* Wait 1.8V output of voltage regulator in card stable */
1225 	msleep(50);
1226 
1227 	/* Toggle SD clock again */
1228 	err = rtsx_pci_write_register(pcr, SD_BUS_STAT, 0xFF, SD_CLK_TOGGLE_EN);
1229 	if (err < 0)
1230 		return err;
1231 
1232 	/* Wait for a period of time so that the card can drive
1233 	 * SD_DAT[3:0] to high at 1.8V
1234 	 */
1235 	msleep(20);
1236 
1237 	/* SD_CMD, SD_DAT[3:0] should be pulled high by host */
1238 	err = rtsx_pci_read_register(pcr, SD_BUS_STAT, &stat);
1239 	if (err < 0)
1240 		return err;
1241 
1242 	mask = SD_CMD_STATUS | SD_DAT3_STATUS | SD_DAT2_STATUS |
1243 		SD_DAT1_STATUS | SD_DAT0_STATUS;
1244 	val = SD_CMD_STATUS | SD_DAT3_STATUS | SD_DAT2_STATUS |
1245 		SD_DAT1_STATUS | SD_DAT0_STATUS;
1246 	if ((stat & mask) != val) {
1247 		dev_dbg(sdmmc_dev(host),
1248 			"%s: SD_BUS_STAT = 0x%x\n", __func__, stat);
1249 		rtsx_pci_write_register(pcr, SD_BUS_STAT,
1250 				SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
1251 		rtsx_pci_write_register(pcr, CARD_CLK_EN, 0xFF, 0);
1252 		return -EINVAL;
1253 	}
1254 
1255 	return 0;
1256 }
1257 
1258 static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1259 {
1260 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
1261 	struct rtsx_pcr *pcr = host->pcr;
1262 	int err = 0;
1263 	u8 voltage;
1264 
1265 	dev_dbg(sdmmc_dev(host), "%s: signal_voltage = %d\n",
1266 			__func__, ios->signal_voltage);
1267 
1268 	if (host->eject)
1269 		return -ENOMEDIUM;
1270 
1271 	err = rtsx_pci_card_exclusive_check(host->pcr, RTSX_SD_CARD);
1272 	if (err)
1273 		return err;
1274 
1275 	mutex_lock(&pcr->pcr_mutex);
1276 
1277 	rtsx_pci_start_run(pcr);
1278 
1279 	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1280 		voltage = OUTPUT_3V3;
1281 	else
1282 		voltage = OUTPUT_1V8;
1283 
1284 	if (voltage == OUTPUT_1V8) {
1285 		err = sd_wait_voltage_stable_1(host);
1286 		if (err < 0)
1287 			goto out;
1288 	}
1289 
1290 	err = rtsx_pci_switch_output_voltage(pcr, voltage);
1291 	if (err < 0)
1292 		goto out;
1293 
1294 	if (voltage == OUTPUT_1V8) {
1295 		err = sd_wait_voltage_stable_2(host);
1296 		if (err < 0)
1297 			goto out;
1298 	}
1299 
1300 out:
1301 	/* Stop toggle SD clock in idle */
1302 	err = rtsx_pci_write_register(pcr, SD_BUS_STAT,
1303 			SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
1304 
1305 	mutex_unlock(&pcr->pcr_mutex);
1306 
1307 	return err;
1308 }
1309 
1310 static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
1311 {
1312 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
1313 	struct rtsx_pcr *pcr = host->pcr;
1314 	int err = 0;
1315 
1316 	if (host->eject)
1317 		return -ENOMEDIUM;
1318 
1319 	err = rtsx_pci_card_exclusive_check(host->pcr, RTSX_SD_CARD);
1320 	if (err)
1321 		return err;
1322 
1323 	mutex_lock(&pcr->pcr_mutex);
1324 
1325 	rtsx_pci_start_run(pcr);
1326 
1327 	/* Set initial TX phase */
1328 	switch (mmc->ios.timing) {
1329 	case MMC_TIMING_UHS_SDR104:
1330 		err = sd_change_phase(host, SDR104_TX_PHASE(pcr), false);
1331 		break;
1332 
1333 	case MMC_TIMING_UHS_SDR50:
1334 		err = sd_change_phase(host, SDR50_TX_PHASE(pcr), false);
1335 		break;
1336 
1337 	case MMC_TIMING_UHS_DDR50:
1338 		err = sd_change_phase(host, DDR50_TX_PHASE(pcr), false);
1339 		break;
1340 
1341 	default:
1342 		err = 0;
1343 	}
1344 
1345 	if (err)
1346 		goto out;
1347 
1348 	/* Tuning RX phase */
1349 	if ((mmc->ios.timing == MMC_TIMING_UHS_SDR104) ||
1350 			(mmc->ios.timing == MMC_TIMING_UHS_SDR50))
1351 		err = sd_tuning_rx(host, opcode);
1352 	else if (mmc->ios.timing == MMC_TIMING_UHS_DDR50)
1353 		err = sd_change_phase(host, DDR50_RX_PHASE(pcr), true);
1354 
1355 out:
1356 	mutex_unlock(&pcr->pcr_mutex);
1357 
1358 	return err;
1359 }
1360 
1361 static int sdmmc_init_sd_express(struct mmc_host *mmc, struct mmc_ios *ios)
1362 {
1363 	u32 relink_time;
1364 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
1365 	struct rtsx_pcr *pcr = host->pcr;
1366 
1367 	/* Set relink_time for changing to PCIe card */
1368 	relink_time = 0x8FFF;
1369 
1370 	rtsx_pci_write_register(pcr, 0xFF01, 0xFF, relink_time);
1371 	rtsx_pci_write_register(pcr, 0xFF02, 0xFF, relink_time >> 8);
1372 	rtsx_pci_write_register(pcr, 0xFF03, 0x01, relink_time >> 16);
1373 
1374 	rtsx_pci_write_register(pcr, PETXCFG, 0x80, 0x80);
1375 	rtsx_pci_write_register(pcr, LDO_VCC_CFG0,
1376 		RTS5261_LDO1_OCP_THD_MASK,
1377 		pcr->option.sd_800mA_ocp_thd);
1378 
1379 	if (pcr->ops->disable_auto_blink)
1380 		pcr->ops->disable_auto_blink(pcr);
1381 
1382 	/* For PCIe/NVMe mode can't enter delink issue */
1383 	pcr->hw_param.interrupt_en &= ~(SD_INT_EN);
1384 	rtsx_pci_writel(pcr, RTSX_BIER, pcr->hw_param.interrupt_en);
1385 
1386 	rtsx_pci_write_register(pcr, RTS5260_AUTOLOAD_CFG4,
1387 		RTS5261_AUX_CLK_16M_EN, RTS5261_AUX_CLK_16M_EN);
1388 	rtsx_pci_write_register(pcr, RTS5261_FW_CFG0,
1389 		RTS5261_FW_ENTER_EXPRESS, RTS5261_FW_ENTER_EXPRESS);
1390 	rtsx_pci_write_register(pcr, RTS5261_FW_CFG1,
1391 		RTS5261_MCU_CLOCK_GATING, RTS5261_MCU_CLOCK_GATING);
1392 	rtsx_pci_write_register(pcr, RTS5261_FW_CFG1,
1393 		RTS5261_MCU_BUS_SEL_MASK | RTS5261_MCU_CLOCK_SEL_MASK
1394 		| RTS5261_DRIVER_ENABLE_FW,
1395 		RTS5261_MCU_CLOCK_SEL_16M | RTS5261_DRIVER_ENABLE_FW);
1396 	host->eject = true;
1397 	return 0;
1398 }
1399 
1400 static const struct mmc_host_ops realtek_pci_sdmmc_ops = {
1401 	.pre_req = sdmmc_pre_req,
1402 	.post_req = sdmmc_post_req,
1403 	.request = sdmmc_request,
1404 	.set_ios = sdmmc_set_ios,
1405 	.get_ro = sdmmc_get_ro,
1406 	.get_cd = sdmmc_get_cd,
1407 	.start_signal_voltage_switch = sdmmc_switch_voltage,
1408 	.execute_tuning = sdmmc_execute_tuning,
1409 	.init_sd_express = sdmmc_init_sd_express,
1410 };
1411 
1412 static void init_extra_caps(struct realtek_pci_sdmmc *host)
1413 {
1414 	struct mmc_host *mmc = host->mmc;
1415 	struct rtsx_pcr *pcr = host->pcr;
1416 
1417 	dev_dbg(sdmmc_dev(host), "pcr->extra_caps = 0x%x\n", pcr->extra_caps);
1418 
1419 	if (pcr->extra_caps & EXTRA_CAPS_SD_SDR50)
1420 		mmc->caps |= MMC_CAP_UHS_SDR50;
1421 	if (pcr->extra_caps & EXTRA_CAPS_SD_SDR104)
1422 		mmc->caps |= MMC_CAP_UHS_SDR104;
1423 	if (pcr->extra_caps & EXTRA_CAPS_SD_DDR50)
1424 		mmc->caps |= MMC_CAP_UHS_DDR50;
1425 	if (pcr->extra_caps & EXTRA_CAPS_MMC_HSDDR)
1426 		mmc->caps |= MMC_CAP_1_8V_DDR;
1427 	if (pcr->extra_caps & EXTRA_CAPS_MMC_8BIT)
1428 		mmc->caps |= MMC_CAP_8_BIT_DATA;
1429 	if (pcr->extra_caps & EXTRA_CAPS_NO_MMC)
1430 		mmc->caps2 |= MMC_CAP2_NO_MMC;
1431 	if (pcr->extra_caps & EXTRA_CAPS_SD_EXPRESS)
1432 		mmc->caps2 |= MMC_CAP2_SD_EXP | MMC_CAP2_SD_EXP_1_2V;
1433 }
1434 
1435 static void realtek_init_host(struct realtek_pci_sdmmc *host)
1436 {
1437 	struct mmc_host *mmc = host->mmc;
1438 	struct rtsx_pcr *pcr = host->pcr;
1439 
1440 	mmc->f_min = 250000;
1441 	mmc->f_max = 208000000;
1442 	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
1443 	mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED |
1444 		MMC_CAP_MMC_HIGHSPEED | MMC_CAP_BUS_WIDTH_TEST |
1445 		MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
1446 	if (pcr->rtd3_en)
1447 		mmc->caps = mmc->caps | MMC_CAP_AGGRESSIVE_PM;
1448 	mmc->caps2 = MMC_CAP2_NO_PRESCAN_POWERUP | MMC_CAP2_FULL_PWR_CYCLE |
1449 		MMC_CAP2_NO_SDIO;
1450 	mmc->max_current_330 = 400;
1451 	mmc->max_current_180 = 800;
1452 	mmc->ops = &realtek_pci_sdmmc_ops;
1453 
1454 	init_extra_caps(host);
1455 
1456 	mmc->max_segs = 256;
1457 	mmc->max_seg_size = 65536;
1458 	mmc->max_blk_size = 512;
1459 	mmc->max_blk_count = 65535;
1460 	mmc->max_req_size = 524288;
1461 }
1462 
1463 static void rtsx_pci_sdmmc_card_event(struct platform_device *pdev)
1464 {
1465 	struct realtek_pci_sdmmc *host = platform_get_drvdata(pdev);
1466 
1467 	host->cookie = -1;
1468 	mmc_detect_change(host->mmc, 0);
1469 }
1470 
1471 static int rtsx_pci_sdmmc_drv_probe(struct platform_device *pdev)
1472 {
1473 	struct mmc_host *mmc;
1474 	struct realtek_pci_sdmmc *host;
1475 	struct rtsx_pcr *pcr;
1476 	struct pcr_handle *handle = pdev->dev.platform_data;
1477 
1478 	if (!handle)
1479 		return -ENXIO;
1480 
1481 	pcr = handle->pcr;
1482 	if (!pcr)
1483 		return -ENXIO;
1484 
1485 	dev_dbg(&(pdev->dev), ": Realtek PCI-E SDMMC controller found\n");
1486 
1487 	mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
1488 	if (!mmc)
1489 		return -ENOMEM;
1490 
1491 	host = mmc_priv(mmc);
1492 	host->pcr = pcr;
1493 	mmc->ios.power_delay_ms = 5;
1494 	host->mmc = mmc;
1495 	host->pdev = pdev;
1496 	host->cookie = -1;
1497 	host->prev_power_state = MMC_POWER_OFF;
1498 	INIT_WORK(&host->work, sd_request);
1499 	platform_set_drvdata(pdev, host);
1500 	pcr->slots[RTSX_SD_CARD].p_dev = pdev;
1501 	pcr->slots[RTSX_SD_CARD].card_event = rtsx_pci_sdmmc_card_event;
1502 
1503 	mutex_init(&host->host_mutex);
1504 
1505 	realtek_init_host(host);
1506 
1507 	pm_runtime_no_callbacks(&pdev->dev);
1508 	pm_runtime_set_active(&pdev->dev);
1509 	pm_runtime_enable(&pdev->dev);
1510 	pm_runtime_set_autosuspend_delay(&pdev->dev, 200);
1511 	pm_runtime_mark_last_busy(&pdev->dev);
1512 	pm_runtime_use_autosuspend(&pdev->dev);
1513 
1514 	mmc_add_host(mmc);
1515 
1516 	return 0;
1517 }
1518 
1519 static int rtsx_pci_sdmmc_drv_remove(struct platform_device *pdev)
1520 {
1521 	struct realtek_pci_sdmmc *host = platform_get_drvdata(pdev);
1522 	struct rtsx_pcr *pcr;
1523 	struct mmc_host *mmc;
1524 
1525 	if (!host)
1526 		return 0;
1527 
1528 	pcr = host->pcr;
1529 	pcr->slots[RTSX_SD_CARD].p_dev = NULL;
1530 	pcr->slots[RTSX_SD_CARD].card_event = NULL;
1531 	mmc = host->mmc;
1532 
1533 	cancel_work_sync(&host->work);
1534 
1535 	mutex_lock(&host->host_mutex);
1536 	if (host->mrq) {
1537 		dev_dbg(&(pdev->dev),
1538 			"%s: Controller removed during transfer\n",
1539 			mmc_hostname(mmc));
1540 
1541 		rtsx_pci_complete_unfinished_transfer(pcr);
1542 
1543 		host->mrq->cmd->error = -ENOMEDIUM;
1544 		if (host->mrq->stop)
1545 			host->mrq->stop->error = -ENOMEDIUM;
1546 		mmc_request_done(mmc, host->mrq);
1547 	}
1548 	mutex_unlock(&host->host_mutex);
1549 
1550 	mmc_remove_host(mmc);
1551 	host->eject = true;
1552 
1553 	flush_work(&host->work);
1554 
1555 	pm_runtime_dont_use_autosuspend(&pdev->dev);
1556 	pm_runtime_disable(&pdev->dev);
1557 
1558 	mmc_free_host(mmc);
1559 
1560 	dev_dbg(&(pdev->dev),
1561 		": Realtek PCI-E SDMMC controller has been removed\n");
1562 
1563 	return 0;
1564 }
1565 
1566 static const struct platform_device_id rtsx_pci_sdmmc_ids[] = {
1567 	{
1568 		.name = DRV_NAME_RTSX_PCI_SDMMC,
1569 	}, {
1570 		/* sentinel */
1571 	}
1572 };
1573 MODULE_DEVICE_TABLE(platform, rtsx_pci_sdmmc_ids);
1574 
1575 static struct platform_driver rtsx_pci_sdmmc_driver = {
1576 	.probe		= rtsx_pci_sdmmc_drv_probe,
1577 	.remove		= rtsx_pci_sdmmc_drv_remove,
1578 	.id_table       = rtsx_pci_sdmmc_ids,
1579 	.driver		= {
1580 		.name	= DRV_NAME_RTSX_PCI_SDMMC,
1581 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1582 	},
1583 };
1584 module_platform_driver(rtsx_pci_sdmmc_driver);
1585 
1586 MODULE_LICENSE("GPL");
1587 MODULE_AUTHOR("Wei WANG <wei_wang@realsil.com.cn>");
1588 MODULE_DESCRIPTION("Realtek PCI-E SD/MMC Card Host Driver");
1589