1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  linux/drivers/mmc/core/mmc.c
4  *
5  *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
6  *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
7  *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
8  */
9 
10 #include <linux/err.h>
11 #include <linux/of.h>
12 #include <linux/slab.h>
13 #include <linux/stat.h>
14 #include <linux/string.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/random.h>
17 #include <linux/sysfs.h>
18 
19 #include <linux/mmc/host.h>
20 #include <linux/mmc/card.h>
21 #include <linux/mmc/mmc.h>
22 
23 #include "core.h"
24 #include "card.h"
25 #include "host.h"
26 #include "bus.h"
27 #include "mmc_ops.h"
28 #include "quirks.h"
29 #include "sd_ops.h"
30 #include "pwrseq.h"
31 
32 #define DEFAULT_CMD6_TIMEOUT_MS	500
33 #define MIN_CACHE_EN_TIMEOUT_MS 1600
34 #define CACHE_FLUSH_TIMEOUT_MS 30000 /* 30s */
35 
36 static const unsigned int tran_exp[] = {
37 	10000,		100000,		1000000,	10000000,
38 	0,		0,		0,		0
39 };
40 
41 static const unsigned char tran_mant[] = {
42 	0,	10,	12,	13,	15,	20,	25,	30,
43 	35,	40,	45,	50,	55,	60,	70,	80,
44 };
45 
46 static const unsigned int taac_exp[] = {
47 	1,	10,	100,	1000,	10000,	100000,	1000000, 10000000,
48 };
49 
50 static const unsigned int taac_mant[] = {
51 	0,	10,	12,	13,	15,	20,	25,	30,
52 	35,	40,	45,	50,	55,	60,	70,	80,
53 };
54 
55 /*
56  * Given the decoded CSD structure, decode the raw CID to our CID structure.
57  */
mmc_decode_cid(struct mmc_card * card)58 static int mmc_decode_cid(struct mmc_card *card)
59 {
60 	u32 *resp = card->raw_cid;
61 
62 	/*
63 	 * Add the raw card ID (cid) data to the entropy pool. It doesn't
64 	 * matter that not all of it is unique, it's just bonus entropy.
65 	 */
66 	add_device_randomness(&card->raw_cid, sizeof(card->raw_cid));
67 
68 	/*
69 	 * The selection of the format here is based upon published
70 	 * specs from SanDisk and from what people have reported.
71 	 */
72 	switch (card->csd.mmca_vsn) {
73 	case 0: /* MMC v1.0 - v1.2 */
74 	case 1: /* MMC v1.4 */
75 		card->cid.manfid	= unstuff_bits(resp, 104, 24);
76 		card->cid.prod_name[0]	= unstuff_bits(resp, 96, 8);
77 		card->cid.prod_name[1]	= unstuff_bits(resp, 88, 8);
78 		card->cid.prod_name[2]	= unstuff_bits(resp, 80, 8);
79 		card->cid.prod_name[3]	= unstuff_bits(resp, 72, 8);
80 		card->cid.prod_name[4]	= unstuff_bits(resp, 64, 8);
81 		card->cid.prod_name[5]	= unstuff_bits(resp, 56, 8);
82 		card->cid.prod_name[6]	= unstuff_bits(resp, 48, 8);
83 		card->cid.hwrev		= unstuff_bits(resp, 44, 4);
84 		card->cid.fwrev		= unstuff_bits(resp, 40, 4);
85 		card->cid.serial	= unstuff_bits(resp, 16, 24);
86 		card->cid.month		= unstuff_bits(resp, 12, 4);
87 		card->cid.year		= unstuff_bits(resp, 8, 4) + 1997;
88 		break;
89 
90 	case 2: /* MMC v2.0 - v2.2 */
91 	case 3: /* MMC v3.1 - v3.3 */
92 	case 4: /* MMC v4 */
93 		card->cid.manfid	= unstuff_bits(resp, 120, 8);
94 		card->cid.oemid		= unstuff_bits(resp, 104, 16);
95 		card->cid.prod_name[0]	= unstuff_bits(resp, 96, 8);
96 		card->cid.prod_name[1]	= unstuff_bits(resp, 88, 8);
97 		card->cid.prod_name[2]	= unstuff_bits(resp, 80, 8);
98 		card->cid.prod_name[3]	= unstuff_bits(resp, 72, 8);
99 		card->cid.prod_name[4]	= unstuff_bits(resp, 64, 8);
100 		card->cid.prod_name[5]	= unstuff_bits(resp, 56, 8);
101 		card->cid.prv		= unstuff_bits(resp, 48, 8);
102 		card->cid.serial	= unstuff_bits(resp, 16, 32);
103 		card->cid.month		= unstuff_bits(resp, 12, 4);
104 		card->cid.year		= unstuff_bits(resp, 8, 4) + 1997;
105 		break;
106 
107 	default:
108 		pr_err("%s: card has unknown MMCA version %d\n",
109 			mmc_hostname(card->host), card->csd.mmca_vsn);
110 		return -EINVAL;
111 	}
112 
113 	/* some product names include trailing whitespace */
114 	strim(card->cid.prod_name);
115 
116 	return 0;
117 }
118 
mmc_set_erase_size(struct mmc_card * card)119 static void mmc_set_erase_size(struct mmc_card *card)
120 {
121 	if (card->ext_csd.erase_group_def & 1)
122 		card->erase_size = card->ext_csd.hc_erase_size;
123 	else
124 		card->erase_size = card->csd.erase_size;
125 
126 	mmc_init_erase(card);
127 }
128 
129 
mmc_set_wp_grp_size(struct mmc_card * card)130 static void mmc_set_wp_grp_size(struct mmc_card *card)
131 {
132 	if (card->ext_csd.erase_group_def & 1)
133 		card->wp_grp_size = card->ext_csd.hc_erase_size *
134 			card->ext_csd.raw_hc_erase_gap_size;
135 	else
136 		card->wp_grp_size = card->csd.erase_size *
137 			(card->csd.wp_grp_size + 1);
138 }
139 
140 /*
141  * Given a 128-bit response, decode to our card CSD structure.
142  */
mmc_decode_csd(struct mmc_card * card)143 static int mmc_decode_csd(struct mmc_card *card)
144 {
145 	struct mmc_csd *csd = &card->csd;
146 	unsigned int e, m, a, b;
147 	u32 *resp = card->raw_csd;
148 
149 	/*
150 	 * We only understand CSD structure v1.1 and v1.2.
151 	 * v1.2 has extra information in bits 15, 11 and 10.
152 	 * We also support eMMC v4.4 & v4.41.
153 	 */
154 	csd->structure = unstuff_bits(resp, 126, 2);
155 	if (csd->structure == 0) {
156 		pr_err("%s: unrecognised CSD structure version %d\n",
157 			mmc_hostname(card->host), csd->structure);
158 		return -EINVAL;
159 	}
160 
161 	csd->mmca_vsn	 = unstuff_bits(resp, 122, 4);
162 	m = unstuff_bits(resp, 115, 4);
163 	e = unstuff_bits(resp, 112, 3);
164 	csd->taac_ns	 = (taac_exp[e] * taac_mant[m] + 9) / 10;
165 	csd->taac_clks	 = unstuff_bits(resp, 104, 8) * 100;
166 
167 	m = unstuff_bits(resp, 99, 4);
168 	e = unstuff_bits(resp, 96, 3);
169 	csd->max_dtr	  = tran_exp[e] * tran_mant[m];
170 	csd->cmdclass	  = unstuff_bits(resp, 84, 12);
171 
172 	e = unstuff_bits(resp, 47, 3);
173 	m = unstuff_bits(resp, 62, 12);
174 	csd->capacity	  = (1 + m) << (e + 2);
175 
176 	csd->read_blkbits = unstuff_bits(resp, 80, 4);
177 	csd->read_partial = unstuff_bits(resp, 79, 1);
178 	csd->write_misalign = unstuff_bits(resp, 78, 1);
179 	csd->read_misalign = unstuff_bits(resp, 77, 1);
180 	csd->dsr_imp = unstuff_bits(resp, 76, 1);
181 	csd->r2w_factor = unstuff_bits(resp, 26, 3);
182 	csd->write_blkbits = unstuff_bits(resp, 22, 4);
183 	csd->write_partial = unstuff_bits(resp, 21, 1);
184 
185 	if (csd->write_blkbits >= 9) {
186 		a = unstuff_bits(resp, 42, 5);
187 		b = unstuff_bits(resp, 37, 5);
188 		csd->erase_size = (a + 1) * (b + 1);
189 		csd->erase_size <<= csd->write_blkbits - 9;
190 		csd->wp_grp_size = unstuff_bits(resp, 32, 5);
191 	}
192 
193 	return 0;
194 }
195 
mmc_select_card_type(struct mmc_card * card)196 static void mmc_select_card_type(struct mmc_card *card)
197 {
198 	struct mmc_host *host = card->host;
199 	u8 card_type = card->ext_csd.raw_card_type;
200 	u32 caps = host->caps, caps2 = host->caps2;
201 	unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
202 	unsigned int avail_type = 0;
203 
204 	if (caps & MMC_CAP_MMC_HIGHSPEED &&
205 	    card_type & EXT_CSD_CARD_TYPE_HS_26) {
206 		hs_max_dtr = MMC_HIGH_26_MAX_DTR;
207 		avail_type |= EXT_CSD_CARD_TYPE_HS_26;
208 	}
209 
210 	if (caps & MMC_CAP_MMC_HIGHSPEED &&
211 	    card_type & EXT_CSD_CARD_TYPE_HS_52) {
212 		hs_max_dtr = MMC_HIGH_52_MAX_DTR;
213 		avail_type |= EXT_CSD_CARD_TYPE_HS_52;
214 	}
215 
216 	if (caps & (MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR) &&
217 	    card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
218 		hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
219 		avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
220 	}
221 
222 	if (caps & MMC_CAP_1_2V_DDR &&
223 	    card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
224 		hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
225 		avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
226 	}
227 
228 	if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
229 	    card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
230 		hs200_max_dtr = MMC_HS200_MAX_DTR;
231 		avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
232 	}
233 
234 	if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
235 	    card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
236 		hs200_max_dtr = MMC_HS200_MAX_DTR;
237 		avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
238 	}
239 
240 	if (caps2 & MMC_CAP2_HS400_1_8V &&
241 	    card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
242 		hs200_max_dtr = MMC_HS200_MAX_DTR;
243 		avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
244 	}
245 
246 	if (caps2 & MMC_CAP2_HS400_1_2V &&
247 	    card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
248 		hs200_max_dtr = MMC_HS200_MAX_DTR;
249 		avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
250 	}
251 
252 	if ((caps2 & MMC_CAP2_HS400_ES) &&
253 	    card->ext_csd.strobe_support &&
254 	    (avail_type & EXT_CSD_CARD_TYPE_HS400))
255 		avail_type |= EXT_CSD_CARD_TYPE_HS400ES;
256 
257 	card->ext_csd.hs_max_dtr = hs_max_dtr;
258 	card->ext_csd.hs200_max_dtr = hs200_max_dtr;
259 	card->mmc_avail_type = avail_type;
260 }
261 
mmc_manage_enhanced_area(struct mmc_card * card,u8 * ext_csd)262 static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
263 {
264 	u8 hc_erase_grp_sz, hc_wp_grp_sz;
265 
266 	/*
267 	 * Disable these attributes by default
268 	 */
269 	card->ext_csd.enhanced_area_offset = -EINVAL;
270 	card->ext_csd.enhanced_area_size = -EINVAL;
271 
272 	/*
273 	 * Enhanced area feature support -- check whether the eMMC
274 	 * card has the Enhanced area enabled.  If so, export enhanced
275 	 * area offset and size to user by adding sysfs interface.
276 	 */
277 	if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
278 	    (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
279 		if (card->ext_csd.partition_setting_completed) {
280 			hc_erase_grp_sz =
281 				ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
282 			hc_wp_grp_sz =
283 				ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
284 
285 			/*
286 			 * calculate the enhanced data area offset, in bytes
287 			 */
288 			card->ext_csd.enhanced_area_offset =
289 				(((unsigned long long)ext_csd[139]) << 24) +
290 				(((unsigned long long)ext_csd[138]) << 16) +
291 				(((unsigned long long)ext_csd[137]) << 8) +
292 				(((unsigned long long)ext_csd[136]));
293 			if (mmc_card_blockaddr(card))
294 				card->ext_csd.enhanced_area_offset <<= 9;
295 			/*
296 			 * calculate the enhanced data area size, in kilobytes
297 			 */
298 			card->ext_csd.enhanced_area_size =
299 				(ext_csd[142] << 16) + (ext_csd[141] << 8) +
300 				ext_csd[140];
301 			card->ext_csd.enhanced_area_size *=
302 				(size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
303 			card->ext_csd.enhanced_area_size <<= 9;
304 		} else {
305 			pr_warn("%s: defines enhanced area without partition setting complete\n",
306 				mmc_hostname(card->host));
307 		}
308 	}
309 }
310 
mmc_part_add(struct mmc_card * card,u64 size,unsigned int part_cfg,char * name,int idx,bool ro,int area_type)311 static void mmc_part_add(struct mmc_card *card, u64 size,
312 			 unsigned int part_cfg, char *name, int idx, bool ro,
313 			 int area_type)
314 {
315 	card->part[card->nr_parts].size = size;
316 	card->part[card->nr_parts].part_cfg = part_cfg;
317 	sprintf(card->part[card->nr_parts].name, name, idx);
318 	card->part[card->nr_parts].force_ro = ro;
319 	card->part[card->nr_parts].area_type = area_type;
320 	card->nr_parts++;
321 }
322 
mmc_manage_gp_partitions(struct mmc_card * card,u8 * ext_csd)323 static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
324 {
325 	int idx;
326 	u8 hc_erase_grp_sz, hc_wp_grp_sz;
327 	u64 part_size;
328 
329 	/*
330 	 * General purpose partition feature support --
331 	 * If ext_csd has the size of general purpose partitions,
332 	 * set size, part_cfg, partition name in mmc_part.
333 	 */
334 	if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
335 	    EXT_CSD_PART_SUPPORT_PART_EN) {
336 		hc_erase_grp_sz =
337 			ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
338 		hc_wp_grp_sz =
339 			ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
340 
341 		for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
342 			if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
343 			    !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
344 			    !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
345 				continue;
346 			if (card->ext_csd.partition_setting_completed == 0) {
347 				pr_warn("%s: has partition size defined without partition complete\n",
348 					mmc_hostname(card->host));
349 				break;
350 			}
351 			part_size =
352 				(ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
353 				<< 16) +
354 				(ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
355 				<< 8) +
356 				ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
357 			part_size *= (hc_erase_grp_sz * hc_wp_grp_sz);
358 			mmc_part_add(card, part_size << 19,
359 				EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
360 				"gp%d", idx, false,
361 				MMC_BLK_DATA_AREA_GP);
362 		}
363 	}
364 }
365 
366 /* Minimum partition switch timeout in milliseconds */
367 #define MMC_MIN_PART_SWITCH_TIME	300
368 
369 /*
370  * Decode extended CSD.
371  */
mmc_decode_ext_csd(struct mmc_card * card,u8 * ext_csd)372 static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
373 {
374 	int err = 0, idx;
375 	u64 part_size;
376 	struct device_node *np;
377 	bool broken_hpi = false;
378 
379 	/* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
380 	card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
381 	if (card->csd.structure == 3) {
382 		if (card->ext_csd.raw_ext_csd_structure > 2) {
383 			pr_err("%s: unrecognised EXT_CSD structure "
384 				"version %d\n", mmc_hostname(card->host),
385 					card->ext_csd.raw_ext_csd_structure);
386 			err = -EINVAL;
387 			goto out;
388 		}
389 	}
390 
391 	np = mmc_of_find_child_device(card->host, 0);
392 	if (np && of_device_is_compatible(np, "mmc-card"))
393 		broken_hpi = of_property_read_bool(np, "broken-hpi");
394 	of_node_put(np);
395 
396 	/*
397 	 * The EXT_CSD format is meant to be forward compatible. As long
398 	 * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
399 	 * are authorized, see JEDEC JESD84-B50 section B.8.
400 	 */
401 	card->ext_csd.rev = ext_csd[EXT_CSD_REV];
402 
403 	/* fixup device after ext_csd revision field is updated */
404 	mmc_fixup_device(card, mmc_ext_csd_fixups);
405 
406 	card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
407 	card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
408 	card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
409 	card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
410 	if (card->ext_csd.rev >= 2) {
411 		card->ext_csd.sectors =
412 			ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
413 			ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
414 			ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
415 			ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
416 
417 		/* Cards with density > 2GiB are sector addressed */
418 		if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
419 			mmc_card_set_blockaddr(card);
420 	}
421 
422 	card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
423 	card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
424 
425 	card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
426 	card->ext_csd.raw_erase_timeout_mult =
427 		ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
428 	card->ext_csd.raw_hc_erase_grp_size =
429 		ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
430 	card->ext_csd.raw_boot_mult =
431 		ext_csd[EXT_CSD_BOOT_MULT];
432 	if (card->ext_csd.rev >= 3) {
433 		u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
434 		card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
435 
436 		/* EXT_CSD value is in units of 10ms, but we store in ms */
437 		card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
438 
439 		/* Sleep / awake timeout in 100ns units */
440 		if (sa_shift > 0 && sa_shift <= 0x17)
441 			card->ext_csd.sa_timeout =
442 					1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
443 		card->ext_csd.erase_group_def =
444 			ext_csd[EXT_CSD_ERASE_GROUP_DEF];
445 		card->ext_csd.hc_erase_timeout = 300 *
446 			ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
447 		card->ext_csd.hc_erase_size =
448 			ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
449 
450 		card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
451 
452 		/*
453 		 * There are two boot regions of equal size, defined in
454 		 * multiples of 128K.
455 		 */
456 		if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
457 			for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
458 				part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
459 				mmc_part_add(card, part_size,
460 					EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
461 					"boot%d", idx, true,
462 					MMC_BLK_DATA_AREA_BOOT);
463 			}
464 		}
465 	}
466 
467 	card->ext_csd.raw_hc_erase_gap_size =
468 		ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
469 	card->ext_csd.raw_sec_trim_mult =
470 		ext_csd[EXT_CSD_SEC_TRIM_MULT];
471 	card->ext_csd.raw_sec_erase_mult =
472 		ext_csd[EXT_CSD_SEC_ERASE_MULT];
473 	card->ext_csd.raw_sec_feature_support =
474 		ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
475 	card->ext_csd.raw_trim_mult =
476 		ext_csd[EXT_CSD_TRIM_MULT];
477 	card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
478 	card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
479 	if (card->ext_csd.rev >= 4) {
480 		if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
481 		    EXT_CSD_PART_SETTING_COMPLETED)
482 			card->ext_csd.partition_setting_completed = 1;
483 		else
484 			card->ext_csd.partition_setting_completed = 0;
485 
486 		mmc_manage_enhanced_area(card, ext_csd);
487 
488 		mmc_manage_gp_partitions(card, ext_csd);
489 
490 		card->ext_csd.sec_trim_mult =
491 			ext_csd[EXT_CSD_SEC_TRIM_MULT];
492 		card->ext_csd.sec_erase_mult =
493 			ext_csd[EXT_CSD_SEC_ERASE_MULT];
494 		card->ext_csd.sec_feature_support =
495 			ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
496 		card->ext_csd.trim_timeout = 300 *
497 			ext_csd[EXT_CSD_TRIM_MULT];
498 
499 		/*
500 		 * Note that the call to mmc_part_add above defaults to read
501 		 * only. If this default assumption is changed, the call must
502 		 * take into account the value of boot_locked below.
503 		 */
504 		card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
505 		card->ext_csd.boot_ro_lockable = true;
506 
507 		/* Save power class values */
508 		card->ext_csd.raw_pwr_cl_52_195 =
509 			ext_csd[EXT_CSD_PWR_CL_52_195];
510 		card->ext_csd.raw_pwr_cl_26_195 =
511 			ext_csd[EXT_CSD_PWR_CL_26_195];
512 		card->ext_csd.raw_pwr_cl_52_360 =
513 			ext_csd[EXT_CSD_PWR_CL_52_360];
514 		card->ext_csd.raw_pwr_cl_26_360 =
515 			ext_csd[EXT_CSD_PWR_CL_26_360];
516 		card->ext_csd.raw_pwr_cl_200_195 =
517 			ext_csd[EXT_CSD_PWR_CL_200_195];
518 		card->ext_csd.raw_pwr_cl_200_360 =
519 			ext_csd[EXT_CSD_PWR_CL_200_360];
520 		card->ext_csd.raw_pwr_cl_ddr_52_195 =
521 			ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
522 		card->ext_csd.raw_pwr_cl_ddr_52_360 =
523 			ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
524 		card->ext_csd.raw_pwr_cl_ddr_200_360 =
525 			ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
526 	}
527 
528 	if (card->ext_csd.rev >= 5) {
529 		/* Adjust production date as per JEDEC JESD84-B451 */
530 		if (card->cid.year < 2010)
531 			card->cid.year += 16;
532 
533 		/* check whether the eMMC card supports BKOPS */
534 		if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
535 			card->ext_csd.bkops = 1;
536 			card->ext_csd.man_bkops_en =
537 					(ext_csd[EXT_CSD_BKOPS_EN] &
538 						EXT_CSD_MANUAL_BKOPS_MASK);
539 			card->ext_csd.raw_bkops_status =
540 				ext_csd[EXT_CSD_BKOPS_STATUS];
541 			if (card->ext_csd.man_bkops_en)
542 				pr_debug("%s: MAN_BKOPS_EN bit is set\n",
543 					mmc_hostname(card->host));
544 			card->ext_csd.auto_bkops_en =
545 					(ext_csd[EXT_CSD_BKOPS_EN] &
546 						EXT_CSD_AUTO_BKOPS_MASK);
547 			if (card->ext_csd.auto_bkops_en)
548 				pr_debug("%s: AUTO_BKOPS_EN bit is set\n",
549 					mmc_hostname(card->host));
550 		}
551 
552 		/* check whether the eMMC card supports HPI */
553 		if (!mmc_card_broken_hpi(card) &&
554 		    !broken_hpi && (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1)) {
555 			card->ext_csd.hpi = 1;
556 			if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
557 				card->ext_csd.hpi_cmd =	MMC_STOP_TRANSMISSION;
558 			else
559 				card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
560 			/*
561 			 * Indicate the maximum timeout to close
562 			 * a command interrupted by HPI
563 			 */
564 			card->ext_csd.out_of_int_time =
565 				ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
566 		}
567 
568 		card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
569 		card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
570 
571 		/*
572 		 * RPMB regions are defined in multiples of 128K.
573 		 */
574 		card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
575 		if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
576 			mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
577 				EXT_CSD_PART_CONFIG_ACC_RPMB,
578 				"rpmb", 0, false,
579 				MMC_BLK_DATA_AREA_RPMB);
580 		}
581 	}
582 
583 	card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
584 	if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
585 		card->erased_byte = 0xFF;
586 	else
587 		card->erased_byte = 0x0;
588 
589 	/* eMMC v4.5 or later */
590 	card->ext_csd.generic_cmd6_time = DEFAULT_CMD6_TIMEOUT_MS;
591 	if (card->ext_csd.rev >= 6) {
592 		card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
593 
594 		card->ext_csd.generic_cmd6_time = 10 *
595 			ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
596 		card->ext_csd.power_off_longtime = 10 *
597 			ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
598 
599 		card->ext_csd.cache_size =
600 			ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
601 			ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
602 			ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
603 			ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
604 
605 		if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
606 			card->ext_csd.data_sector_size = 4096;
607 		else
608 			card->ext_csd.data_sector_size = 512;
609 
610 		if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
611 		    (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
612 			card->ext_csd.data_tag_unit_size =
613 			((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
614 			(card->ext_csd.data_sector_size);
615 		} else {
616 			card->ext_csd.data_tag_unit_size = 0;
617 		}
618 	} else {
619 		card->ext_csd.data_sector_size = 512;
620 	}
621 
622 	/*
623 	 * GENERIC_CMD6_TIME is to be used "unless a specific timeout is defined
624 	 * when accessing a specific field", so use it here if there is no
625 	 * PARTITION_SWITCH_TIME.
626 	 */
627 	if (!card->ext_csd.part_time)
628 		card->ext_csd.part_time = card->ext_csd.generic_cmd6_time;
629 	/* Some eMMC set the value too low so set a minimum */
630 	if (card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
631 		card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
632 
633 	/* eMMC v5 or later */
634 	if (card->ext_csd.rev >= 7) {
635 		memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
636 		       MMC_FIRMWARE_LEN);
637 		card->ext_csd.ffu_capable =
638 			(ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
639 			!(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
640 
641 		card->ext_csd.pre_eol_info = ext_csd[EXT_CSD_PRE_EOL_INFO];
642 		card->ext_csd.device_life_time_est_typ_a =
643 			ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A];
644 		card->ext_csd.device_life_time_est_typ_b =
645 			ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B];
646 	}
647 
648 	/* eMMC v5.1 or later */
649 	if (card->ext_csd.rev >= 8) {
650 		card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT] &
651 					     EXT_CSD_CMDQ_SUPPORTED;
652 		card->ext_csd.cmdq_depth = (ext_csd[EXT_CSD_CMDQ_DEPTH] &
653 					    EXT_CSD_CMDQ_DEPTH_MASK) + 1;
654 		/* Exclude inefficiently small queue depths */
655 		if (card->ext_csd.cmdq_depth <= 2) {
656 			card->ext_csd.cmdq_support = false;
657 			card->ext_csd.cmdq_depth = 0;
658 		}
659 		if (card->ext_csd.cmdq_support) {
660 			pr_debug("%s: Command Queue supported depth %u\n",
661 				 mmc_hostname(card->host),
662 				 card->ext_csd.cmdq_depth);
663 		}
664 		card->ext_csd.enhanced_rpmb_supported =
665 					(card->ext_csd.rel_param &
666 					 EXT_CSD_WR_REL_PARAM_EN_RPMB_REL_WR);
667 	}
668 out:
669 	return err;
670 }
671 
mmc_read_ext_csd(struct mmc_card * card)672 static int mmc_read_ext_csd(struct mmc_card *card)
673 {
674 	u8 *ext_csd;
675 	int err;
676 
677 	if (!mmc_can_ext_csd(card))
678 		return 0;
679 
680 	err = mmc_get_ext_csd(card, &ext_csd);
681 	if (err) {
682 		/* If the host or the card can't do the switch,
683 		 * fail more gracefully. */
684 		if ((err != -EINVAL)
685 		 && (err != -ENOSYS)
686 		 && (err != -EFAULT))
687 			return err;
688 
689 		/*
690 		 * High capacity cards should have this "magic" size
691 		 * stored in their CSD.
692 		 */
693 		if (card->csd.capacity == (4096 * 512)) {
694 			pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
695 				mmc_hostname(card->host));
696 		} else {
697 			pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
698 				mmc_hostname(card->host));
699 			err = 0;
700 		}
701 
702 		return err;
703 	}
704 
705 	err = mmc_decode_ext_csd(card, ext_csd);
706 	kfree(ext_csd);
707 	return err;
708 }
709 
mmc_compare_ext_csds(struct mmc_card * card,unsigned bus_width)710 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
711 {
712 	u8 *bw_ext_csd;
713 	int err;
714 
715 	if (bus_width == MMC_BUS_WIDTH_1)
716 		return 0;
717 
718 	err = mmc_get_ext_csd(card, &bw_ext_csd);
719 	if (err)
720 		return err;
721 
722 	/* only compare read only fields */
723 	err = !((card->ext_csd.raw_partition_support ==
724 			bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
725 		(card->ext_csd.raw_erased_mem_count ==
726 			bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
727 		(card->ext_csd.rev ==
728 			bw_ext_csd[EXT_CSD_REV]) &&
729 		(card->ext_csd.raw_ext_csd_structure ==
730 			bw_ext_csd[EXT_CSD_STRUCTURE]) &&
731 		(card->ext_csd.raw_card_type ==
732 			bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
733 		(card->ext_csd.raw_s_a_timeout ==
734 			bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
735 		(card->ext_csd.raw_hc_erase_gap_size ==
736 			bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
737 		(card->ext_csd.raw_erase_timeout_mult ==
738 			bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
739 		(card->ext_csd.raw_hc_erase_grp_size ==
740 			bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
741 		(card->ext_csd.raw_sec_trim_mult ==
742 			bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
743 		(card->ext_csd.raw_sec_erase_mult ==
744 			bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
745 		(card->ext_csd.raw_sec_feature_support ==
746 			bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
747 		(card->ext_csd.raw_trim_mult ==
748 			bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
749 		(card->ext_csd.raw_sectors[0] ==
750 			bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
751 		(card->ext_csd.raw_sectors[1] ==
752 			bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
753 		(card->ext_csd.raw_sectors[2] ==
754 			bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
755 		(card->ext_csd.raw_sectors[3] ==
756 			bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
757 		(card->ext_csd.raw_pwr_cl_52_195 ==
758 			bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
759 		(card->ext_csd.raw_pwr_cl_26_195 ==
760 			bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
761 		(card->ext_csd.raw_pwr_cl_52_360 ==
762 			bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
763 		(card->ext_csd.raw_pwr_cl_26_360 ==
764 			bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
765 		(card->ext_csd.raw_pwr_cl_200_195 ==
766 			bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
767 		(card->ext_csd.raw_pwr_cl_200_360 ==
768 			bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
769 		(card->ext_csd.raw_pwr_cl_ddr_52_195 ==
770 			bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
771 		(card->ext_csd.raw_pwr_cl_ddr_52_360 ==
772 			bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
773 		(card->ext_csd.raw_pwr_cl_ddr_200_360 ==
774 			bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
775 
776 	if (err)
777 		err = -EINVAL;
778 
779 	kfree(bw_ext_csd);
780 	return err;
781 }
782 
783 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
784 	card->raw_cid[2], card->raw_cid[3]);
785 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
786 	card->raw_csd[2], card->raw_csd[3]);
787 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
788 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
789 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
790 MMC_DEV_ATTR(wp_grp_size, "%u\n", card->wp_grp_size << 9);
791 MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
792 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
793 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
794 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
795 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
796 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
797 MMC_DEV_ATTR(rev, "0x%x\n", card->ext_csd.rev);
798 MMC_DEV_ATTR(pre_eol_info, "0x%02x\n", card->ext_csd.pre_eol_info);
799 MMC_DEV_ATTR(life_time, "0x%02x 0x%02x\n",
800 	card->ext_csd.device_life_time_est_typ_a,
801 	card->ext_csd.device_life_time_est_typ_b);
802 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
803 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
804 		card->ext_csd.enhanced_area_offset);
805 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
806 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
807 MMC_DEV_ATTR(enhanced_rpmb_supported, "%#x\n",
808 	card->ext_csd.enhanced_rpmb_supported);
809 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
810 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
811 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
812 MMC_DEV_ATTR(cmdq_en, "%d\n", card->ext_csd.cmdq_en);
813 
mmc_fwrev_show(struct device * dev,struct device_attribute * attr,char * buf)814 static ssize_t mmc_fwrev_show(struct device *dev,
815 			      struct device_attribute *attr,
816 			      char *buf)
817 {
818 	struct mmc_card *card = mmc_dev_to_card(dev);
819 
820 	if (card->ext_csd.rev < 7)
821 		return sysfs_emit(buf, "0x%x\n", card->cid.fwrev);
822 	else
823 		return sysfs_emit(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
824 				  card->ext_csd.fwrev);
825 }
826 
827 static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
828 
mmc_dsr_show(struct device * dev,struct device_attribute * attr,char * buf)829 static ssize_t mmc_dsr_show(struct device *dev,
830 			    struct device_attribute *attr,
831 			    char *buf)
832 {
833 	struct mmc_card *card = mmc_dev_to_card(dev);
834 	struct mmc_host *host = card->host;
835 
836 	if (card->csd.dsr_imp && host->dsr_req)
837 		return sysfs_emit(buf, "0x%x\n", host->dsr);
838 	else
839 		/* return default DSR value */
840 		return sysfs_emit(buf, "0x%x\n", 0x404);
841 }
842 
843 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
844 
845 static struct attribute *mmc_std_attrs[] = {
846 	&dev_attr_cid.attr,
847 	&dev_attr_csd.attr,
848 	&dev_attr_date.attr,
849 	&dev_attr_erase_size.attr,
850 	&dev_attr_preferred_erase_size.attr,
851 	&dev_attr_wp_grp_size.attr,
852 	&dev_attr_fwrev.attr,
853 	&dev_attr_ffu_capable.attr,
854 	&dev_attr_hwrev.attr,
855 	&dev_attr_manfid.attr,
856 	&dev_attr_name.attr,
857 	&dev_attr_oemid.attr,
858 	&dev_attr_prv.attr,
859 	&dev_attr_rev.attr,
860 	&dev_attr_pre_eol_info.attr,
861 	&dev_attr_life_time.attr,
862 	&dev_attr_serial.attr,
863 	&dev_attr_enhanced_area_offset.attr,
864 	&dev_attr_enhanced_area_size.attr,
865 	&dev_attr_raw_rpmb_size_mult.attr,
866 	&dev_attr_enhanced_rpmb_supported.attr,
867 	&dev_attr_rel_sectors.attr,
868 	&dev_attr_ocr.attr,
869 	&dev_attr_rca.attr,
870 	&dev_attr_dsr.attr,
871 	&dev_attr_cmdq_en.attr,
872 	NULL,
873 };
874 ATTRIBUTE_GROUPS(mmc_std);
875 
876 static const struct device_type mmc_type = {
877 	.groups = mmc_std_groups,
878 };
879 
880 /*
881  * Select the PowerClass for the current bus width
882  * If power class is defined for 4/8 bit bus in the
883  * extended CSD register, select it by executing the
884  * mmc_switch command.
885  */
__mmc_select_powerclass(struct mmc_card * card,unsigned int bus_width)886 static int __mmc_select_powerclass(struct mmc_card *card,
887 				   unsigned int bus_width)
888 {
889 	struct mmc_host *host = card->host;
890 	struct mmc_ext_csd *ext_csd = &card->ext_csd;
891 	unsigned int pwrclass_val = 0;
892 	int err = 0;
893 
894 	switch (1 << host->ios.vdd) {
895 	case MMC_VDD_165_195:
896 		if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
897 			pwrclass_val = ext_csd->raw_pwr_cl_26_195;
898 		else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
899 			pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
900 				ext_csd->raw_pwr_cl_52_195 :
901 				ext_csd->raw_pwr_cl_ddr_52_195;
902 		else if (host->ios.clock <= MMC_HS200_MAX_DTR)
903 			pwrclass_val = ext_csd->raw_pwr_cl_200_195;
904 		break;
905 	case MMC_VDD_27_28:
906 	case MMC_VDD_28_29:
907 	case MMC_VDD_29_30:
908 	case MMC_VDD_30_31:
909 	case MMC_VDD_31_32:
910 	case MMC_VDD_32_33:
911 	case MMC_VDD_33_34:
912 	case MMC_VDD_34_35:
913 	case MMC_VDD_35_36:
914 		if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
915 			pwrclass_val = ext_csd->raw_pwr_cl_26_360;
916 		else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
917 			pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
918 				ext_csd->raw_pwr_cl_52_360 :
919 				ext_csd->raw_pwr_cl_ddr_52_360;
920 		else if (host->ios.clock <= MMC_HS200_MAX_DTR)
921 			pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
922 				ext_csd->raw_pwr_cl_ddr_200_360 :
923 				ext_csd->raw_pwr_cl_200_360;
924 		break;
925 	default:
926 		pr_warn("%s: Voltage range not supported for power class\n",
927 			mmc_hostname(host));
928 		return -EINVAL;
929 	}
930 
931 	if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
932 		pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
933 				EXT_CSD_PWR_CL_8BIT_SHIFT;
934 	else
935 		pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
936 				EXT_CSD_PWR_CL_4BIT_SHIFT;
937 
938 	/* If the power class is different from the default value */
939 	if (pwrclass_val > 0) {
940 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
941 				 EXT_CSD_POWER_CLASS,
942 				 pwrclass_val,
943 				 card->ext_csd.generic_cmd6_time);
944 	}
945 
946 	return err;
947 }
948 
mmc_select_powerclass(struct mmc_card * card)949 static int mmc_select_powerclass(struct mmc_card *card)
950 {
951 	struct mmc_host *host = card->host;
952 	u32 bus_width, ext_csd_bits;
953 	int err, ddr;
954 
955 	/* Power class selection is supported for versions >= 4.0 */
956 	if (!mmc_can_ext_csd(card))
957 		return 0;
958 
959 	bus_width = host->ios.bus_width;
960 	/* Power class values are defined only for 4/8 bit bus */
961 	if (bus_width == MMC_BUS_WIDTH_1)
962 		return 0;
963 
964 	ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
965 	if (ddr)
966 		ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
967 			EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
968 	else
969 		ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
970 			EXT_CSD_BUS_WIDTH_8 :  EXT_CSD_BUS_WIDTH_4;
971 
972 	err = __mmc_select_powerclass(card, ext_csd_bits);
973 	if (err)
974 		pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
975 			mmc_hostname(host), 1 << bus_width, ddr);
976 
977 	return err;
978 }
979 
980 /*
981  * Set the bus speed for the selected speed mode.
982  */
mmc_set_bus_speed(struct mmc_card * card)983 static void mmc_set_bus_speed(struct mmc_card *card)
984 {
985 	unsigned int max_dtr = (unsigned int)-1;
986 
987 	if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
988 	     max_dtr > card->ext_csd.hs200_max_dtr)
989 		max_dtr = card->ext_csd.hs200_max_dtr;
990 	else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
991 		max_dtr = card->ext_csd.hs_max_dtr;
992 	else if (max_dtr > card->csd.max_dtr)
993 		max_dtr = card->csd.max_dtr;
994 
995 	mmc_set_clock(card->host, max_dtr);
996 }
997 
998 /*
999  * Select the bus width amoung 4-bit and 8-bit(SDR).
1000  * If the bus width is changed successfully, return the selected width value.
1001  * Zero is returned instead of error value if the wide width is not supported.
1002  */
mmc_select_bus_width(struct mmc_card * card)1003 static int mmc_select_bus_width(struct mmc_card *card)
1004 {
1005 	static unsigned ext_csd_bits[] = {
1006 		EXT_CSD_BUS_WIDTH_8,
1007 		EXT_CSD_BUS_WIDTH_4,
1008 		EXT_CSD_BUS_WIDTH_1,
1009 	};
1010 	static unsigned bus_widths[] = {
1011 		MMC_BUS_WIDTH_8,
1012 		MMC_BUS_WIDTH_4,
1013 		MMC_BUS_WIDTH_1,
1014 	};
1015 	struct mmc_host *host = card->host;
1016 	unsigned idx, bus_width = 0;
1017 	int err = 0;
1018 
1019 	if (!mmc_can_ext_csd(card) ||
1020 	    !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
1021 		return 0;
1022 
1023 	idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
1024 
1025 	/*
1026 	 * Unlike SD, MMC cards dont have a configuration register to notify
1027 	 * supported bus width. So bus test command should be run to identify
1028 	 * the supported bus width or compare the ext csd values of current
1029 	 * bus width and ext csd values of 1 bit mode read earlier.
1030 	 */
1031 	for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1032 		/*
1033 		 * Host is capable of 8bit transfer, then switch
1034 		 * the device to work in 8bit transfer mode. If the
1035 		 * mmc switch command returns error then switch to
1036 		 * 4bit transfer mode. On success set the corresponding
1037 		 * bus width on the host.
1038 		 */
1039 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1040 				 EXT_CSD_BUS_WIDTH,
1041 				 ext_csd_bits[idx],
1042 				 card->ext_csd.generic_cmd6_time);
1043 		if (err)
1044 			continue;
1045 
1046 		bus_width = bus_widths[idx];
1047 		mmc_set_bus_width(host, bus_width);
1048 
1049 		/*
1050 		 * If controller can't handle bus width test,
1051 		 * compare ext_csd previously read in 1 bit mode
1052 		 * against ext_csd at new bus width
1053 		 */
1054 		if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1055 			err = mmc_compare_ext_csds(card, bus_width);
1056 		else
1057 			err = mmc_bus_test(card, bus_width);
1058 
1059 		if (!err) {
1060 			err = bus_width;
1061 			break;
1062 		} else {
1063 			pr_warn("%s: switch to bus width %d failed\n",
1064 				mmc_hostname(host), 1 << bus_width);
1065 		}
1066 	}
1067 
1068 	return err;
1069 }
1070 
1071 /*
1072  * Switch to the high-speed mode
1073  */
mmc_select_hs(struct mmc_card * card)1074 static int mmc_select_hs(struct mmc_card *card)
1075 {
1076 	int err;
1077 
1078 	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1079 			   EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1080 			   card->ext_csd.generic_cmd6_time, MMC_TIMING_MMC_HS,
1081 			   true, true, MMC_CMD_RETRIES);
1082 	if (err)
1083 		pr_warn("%s: switch to high-speed failed, err:%d\n",
1084 			mmc_hostname(card->host), err);
1085 
1086 	return err;
1087 }
1088 
1089 /*
1090  * Activate wide bus and DDR if supported.
1091  */
mmc_select_hs_ddr(struct mmc_card * card)1092 static int mmc_select_hs_ddr(struct mmc_card *card)
1093 {
1094 	struct mmc_host *host = card->host;
1095 	u32 bus_width, ext_csd_bits;
1096 	int err = 0;
1097 
1098 	if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
1099 		return 0;
1100 
1101 	bus_width = host->ios.bus_width;
1102 	if (bus_width == MMC_BUS_WIDTH_1)
1103 		return 0;
1104 
1105 	ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1106 		EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
1107 
1108 	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1109 			   EXT_CSD_BUS_WIDTH,
1110 			   ext_csd_bits,
1111 			   card->ext_csd.generic_cmd6_time,
1112 			   MMC_TIMING_MMC_DDR52,
1113 			   true, true, MMC_CMD_RETRIES);
1114 	if (err) {
1115 		pr_err("%s: switch to bus width %d ddr failed\n",
1116 			mmc_hostname(host), 1 << bus_width);
1117 		return err;
1118 	}
1119 
1120 	/*
1121 	 * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1122 	 * signaling.
1123 	 *
1124 	 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1125 	 *
1126 	 * 1.8V vccq at 3.3V core voltage (vcc) is not required
1127 	 * in the JEDEC spec for DDR.
1128 	 *
1129 	 * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
1130 	 * host controller can support this, like some of the SDHCI
1131 	 * controller which connect to an eMMC device. Some of these
1132 	 * host controller still needs to use 1.8v vccq for supporting
1133 	 * DDR mode.
1134 	 *
1135 	 * So the sequence will be:
1136 	 * if (host and device can both support 1.2v IO)
1137 	 *	use 1.2v IO;
1138 	 * else if (host and device can both support 1.8v IO)
1139 	 *	use 1.8v IO;
1140 	 * so if host and device can only support 3.3v IO, this is the
1141 	 * last choice.
1142 	 *
1143 	 * WARNING: eMMC rules are NOT the same as SD DDR
1144 	 */
1145 	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
1146 		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1147 		if (!err)
1148 			return 0;
1149 	}
1150 
1151 	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V &&
1152 	    host->caps & MMC_CAP_1_8V_DDR)
1153 		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1154 
1155 	/* make sure vccq is 3.3v after switching disaster */
1156 	if (err)
1157 		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1158 
1159 	return err;
1160 }
1161 
mmc_select_hs400(struct mmc_card * card)1162 static int mmc_select_hs400(struct mmc_card *card)
1163 {
1164 	struct mmc_host *host = card->host;
1165 	unsigned int max_dtr;
1166 	int err = 0;
1167 	u8 val;
1168 
1169 	/*
1170 	 * HS400 mode requires 8-bit bus width
1171 	 */
1172 	if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1173 	      host->ios.bus_width == MMC_BUS_WIDTH_8))
1174 		return 0;
1175 
1176 	/* Switch card to HS mode */
1177 	val = EXT_CSD_TIMING_HS;
1178 	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1179 			   EXT_CSD_HS_TIMING, val,
1180 			   card->ext_csd.generic_cmd6_time, 0,
1181 			   false, true, MMC_CMD_RETRIES);
1182 	if (err) {
1183 		pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
1184 			mmc_hostname(host), err);
1185 		return err;
1186 	}
1187 
1188 	/* Prepare host to downgrade to HS timing */
1189 	if (host->ops->hs400_downgrade)
1190 		host->ops->hs400_downgrade(host);
1191 
1192 	/* Set host controller to HS timing */
1193 	mmc_set_timing(host, MMC_TIMING_MMC_HS);
1194 
1195 	/* Reduce frequency to HS frequency */
1196 	max_dtr = card->ext_csd.hs_max_dtr;
1197 	mmc_set_clock(host, max_dtr);
1198 
1199 	err = mmc_switch_status(card, true);
1200 	if (err)
1201 		goto out_err;
1202 
1203 	if (host->ops->hs400_prepare_ddr)
1204 		host->ops->hs400_prepare_ddr(host);
1205 
1206 	/* Switch card to DDR */
1207 	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1208 			 EXT_CSD_BUS_WIDTH,
1209 			 EXT_CSD_DDR_BUS_WIDTH_8,
1210 			 card->ext_csd.generic_cmd6_time);
1211 	if (err) {
1212 		pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1213 			mmc_hostname(host), err);
1214 		return err;
1215 	}
1216 
1217 	/* Switch card to HS400 */
1218 	val = EXT_CSD_TIMING_HS400 |
1219 	      card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1220 	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1221 			   EXT_CSD_HS_TIMING, val,
1222 			   card->ext_csd.generic_cmd6_time, 0,
1223 			   false, true, MMC_CMD_RETRIES);
1224 	if (err) {
1225 		pr_err("%s: switch to hs400 failed, err:%d\n",
1226 			 mmc_hostname(host), err);
1227 		return err;
1228 	}
1229 
1230 	/* Set host controller to HS400 timing and frequency */
1231 	mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1232 	mmc_set_bus_speed(card);
1233 
1234 	if (host->ops->execute_hs400_tuning) {
1235 		mmc_retune_disable(host);
1236 		err = host->ops->execute_hs400_tuning(host, card);
1237 		mmc_retune_enable(host);
1238 		if (err)
1239 			goto out_err;
1240 	}
1241 
1242 	if (host->ops->hs400_complete)
1243 		host->ops->hs400_complete(host);
1244 
1245 	err = mmc_switch_status(card, true);
1246 	if (err)
1247 		goto out_err;
1248 
1249 	return 0;
1250 
1251 out_err:
1252 	pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1253 	       __func__, err);
1254 	return err;
1255 }
1256 
mmc_hs200_to_hs400(struct mmc_card * card)1257 int mmc_hs200_to_hs400(struct mmc_card *card)
1258 {
1259 	return mmc_select_hs400(card);
1260 }
1261 
mmc_hs400_to_hs200(struct mmc_card * card)1262 int mmc_hs400_to_hs200(struct mmc_card *card)
1263 {
1264 	struct mmc_host *host = card->host;
1265 	unsigned int max_dtr;
1266 	int err;
1267 	u8 val;
1268 
1269 	/* Reduce frequency to HS */
1270 	max_dtr = card->ext_csd.hs_max_dtr;
1271 	mmc_set_clock(host, max_dtr);
1272 
1273 	/* Switch HS400 to HS DDR */
1274 	val = EXT_CSD_TIMING_HS;
1275 	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1276 			   val, card->ext_csd.generic_cmd6_time, 0,
1277 			   false, true, MMC_CMD_RETRIES);
1278 	if (err)
1279 		goto out_err;
1280 
1281 	if (host->ops->hs400_downgrade)
1282 		host->ops->hs400_downgrade(host);
1283 
1284 	mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1285 
1286 	err = mmc_switch_status(card, true);
1287 	if (err)
1288 		goto out_err;
1289 
1290 	/* Switch HS DDR to HS */
1291 	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
1292 			   EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
1293 			   0, false, true, MMC_CMD_RETRIES);
1294 	if (err)
1295 		goto out_err;
1296 
1297 	mmc_set_timing(host, MMC_TIMING_MMC_HS);
1298 
1299 	err = mmc_switch_status(card, true);
1300 	if (err)
1301 		goto out_err;
1302 
1303 	/* Switch HS to HS200 */
1304 	val = EXT_CSD_TIMING_HS200 |
1305 	      card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1306 	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1307 			   val, card->ext_csd.generic_cmd6_time, 0,
1308 			   false, true, MMC_CMD_RETRIES);
1309 	if (err)
1310 		goto out_err;
1311 
1312 	mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1313 
1314 	/*
1315 	 * For HS200, CRC errors are not a reliable way to know the switch
1316 	 * failed. If there really is a problem, we would expect tuning will
1317 	 * fail and the result ends up the same.
1318 	 */
1319 	err = mmc_switch_status(card, false);
1320 	if (err)
1321 		goto out_err;
1322 
1323 	mmc_set_bus_speed(card);
1324 
1325 	/* Prepare tuning for HS400 mode. */
1326 	if (host->ops->prepare_hs400_tuning)
1327 		host->ops->prepare_hs400_tuning(host, &host->ios);
1328 
1329 	return 0;
1330 
1331 out_err:
1332 	pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1333 	       __func__, err);
1334 	return err;
1335 }
1336 
mmc_select_driver_type(struct mmc_card * card)1337 static void mmc_select_driver_type(struct mmc_card *card)
1338 {
1339 	int card_drv_type, drive_strength, drv_type = 0;
1340 	int fixed_drv_type = card->host->fixed_drv_type;
1341 
1342 	card_drv_type = card->ext_csd.raw_driver_strength |
1343 			mmc_driver_type_mask(0);
1344 
1345 	if (fixed_drv_type >= 0)
1346 		drive_strength = card_drv_type & mmc_driver_type_mask(fixed_drv_type)
1347 				 ? fixed_drv_type : 0;
1348 	else
1349 		drive_strength = mmc_select_drive_strength(card,
1350 							   card->ext_csd.hs200_max_dtr,
1351 							   card_drv_type, &drv_type);
1352 
1353 	card->drive_strength = drive_strength;
1354 
1355 	if (drv_type)
1356 		mmc_set_driver_type(card->host, drv_type);
1357 }
1358 
mmc_select_hs400es(struct mmc_card * card)1359 static int mmc_select_hs400es(struct mmc_card *card)
1360 {
1361 	struct mmc_host *host = card->host;
1362 	int err = -EINVAL;
1363 	u8 val;
1364 
1365 	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
1366 		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1367 
1368 	if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
1369 		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1370 
1371 	/* If fails try again during next card power cycle */
1372 	if (err)
1373 		goto out_err;
1374 
1375 	err = mmc_select_bus_width(card);
1376 	if (err != MMC_BUS_WIDTH_8) {
1377 		pr_err("%s: switch to 8bit bus width failed, err:%d\n",
1378 			mmc_hostname(host), err);
1379 		err = err < 0 ? err : -ENOTSUPP;
1380 		goto out_err;
1381 	}
1382 
1383 	/* Switch card to HS mode */
1384 	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1385 			   EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1386 			   card->ext_csd.generic_cmd6_time, 0,
1387 			   false, true, MMC_CMD_RETRIES);
1388 	if (err) {
1389 		pr_err("%s: switch to hs for hs400es failed, err:%d\n",
1390 			mmc_hostname(host), err);
1391 		goto out_err;
1392 	}
1393 
1394 	/*
1395 	 * Bump to HS timing and frequency. Some cards don't handle
1396 	 * SEND_STATUS reliably at the initial frequency.
1397 	 */
1398 	mmc_set_timing(host, MMC_TIMING_MMC_HS);
1399 	mmc_set_bus_speed(card);
1400 
1401 	err = mmc_switch_status(card, true);
1402 	if (err)
1403 		goto out_err;
1404 
1405 	/* Switch card to DDR with strobe bit */
1406 	val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
1407 	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1408 			 EXT_CSD_BUS_WIDTH,
1409 			 val,
1410 			 card->ext_csd.generic_cmd6_time);
1411 	if (err) {
1412 		pr_err("%s: switch to bus width for hs400es failed, err:%d\n",
1413 			mmc_hostname(host), err);
1414 		goto out_err;
1415 	}
1416 
1417 	mmc_select_driver_type(card);
1418 
1419 	/* Switch card to HS400 */
1420 	val = EXT_CSD_TIMING_HS400 |
1421 	      card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1422 	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1423 			   EXT_CSD_HS_TIMING, val,
1424 			   card->ext_csd.generic_cmd6_time, 0,
1425 			   false, true, MMC_CMD_RETRIES);
1426 	if (err) {
1427 		pr_err("%s: switch to hs400es failed, err:%d\n",
1428 			mmc_hostname(host), err);
1429 		goto out_err;
1430 	}
1431 
1432 	/* Set host controller to HS400 timing and frequency */
1433 	mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1434 
1435 	/* Controller enable enhanced strobe function */
1436 	host->ios.enhanced_strobe = true;
1437 	if (host->ops->hs400_enhanced_strobe)
1438 		host->ops->hs400_enhanced_strobe(host, &host->ios);
1439 
1440 	err = mmc_switch_status(card, true);
1441 	if (err)
1442 		goto out_err;
1443 
1444 	return 0;
1445 
1446 out_err:
1447 	pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1448 	       __func__, err);
1449 	return err;
1450 }
1451 
1452 /*
1453  * For device supporting HS200 mode, the following sequence
1454  * should be done before executing the tuning process.
1455  * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1456  * 2. switch to HS200 mode
1457  * 3. set the clock to > 52Mhz and <=200MHz
1458  */
mmc_select_hs200(struct mmc_card * card)1459 static int mmc_select_hs200(struct mmc_card *card)
1460 {
1461 	struct mmc_host *host = card->host;
1462 	unsigned int old_timing, old_signal_voltage, old_clock;
1463 	int err = -EINVAL;
1464 	u8 val;
1465 
1466 	old_signal_voltage = host->ios.signal_voltage;
1467 	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1468 		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1469 
1470 	if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1471 		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1472 
1473 	/* If fails try again during next card power cycle */
1474 	if (err)
1475 		return err;
1476 
1477 	mmc_select_driver_type(card);
1478 
1479 	/*
1480 	 * Set the bus width(4 or 8) with host's support and
1481 	 * switch to HS200 mode if bus width is set successfully.
1482 	 */
1483 	err = mmc_select_bus_width(card);
1484 	if (err > 0) {
1485 		val = EXT_CSD_TIMING_HS200 |
1486 		      card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1487 		err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1488 				   EXT_CSD_HS_TIMING, val,
1489 				   card->ext_csd.generic_cmd6_time, 0,
1490 				   false, true, MMC_CMD_RETRIES);
1491 		if (err)
1492 			goto err;
1493 
1494 		/*
1495 		 * Bump to HS timing and frequency. Some cards don't handle
1496 		 * SEND_STATUS reliably at the initial frequency.
1497 		 * NB: We can't move to full (HS200) speeds until after we've
1498 		 * successfully switched over.
1499 		 */
1500 		old_timing = host->ios.timing;
1501 		old_clock = host->ios.clock;
1502 		mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1503 		mmc_set_clock(card->host, card->ext_csd.hs_max_dtr);
1504 
1505 		/*
1506 		 * For HS200, CRC errors are not a reliable way to know the
1507 		 * switch failed. If there really is a problem, we would expect
1508 		 * tuning will fail and the result ends up the same.
1509 		 */
1510 		err = mmc_switch_status(card, false);
1511 
1512 		/*
1513 		 * mmc_select_timing() assumes timing has not changed if
1514 		 * it is a switch error.
1515 		 */
1516 		if (err == -EBADMSG) {
1517 			mmc_set_clock(host, old_clock);
1518 			mmc_set_timing(host, old_timing);
1519 		}
1520 	}
1521 err:
1522 	if (err) {
1523 		/* fall back to the old signal voltage, if fails report error */
1524 		if (mmc_set_signal_voltage(host, old_signal_voltage))
1525 			err = -EIO;
1526 
1527 		pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1528 		       __func__, err);
1529 	}
1530 	return err;
1531 }
1532 
1533 /*
1534  * Activate High Speed, HS200 or HS400ES mode if supported.
1535  */
mmc_select_timing(struct mmc_card * card)1536 static int mmc_select_timing(struct mmc_card *card)
1537 {
1538 	int err = 0;
1539 
1540 	if (!mmc_can_ext_csd(card))
1541 		goto bus_speed;
1542 
1543 	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES) {
1544 		err = mmc_select_hs400es(card);
1545 		goto out;
1546 	}
1547 
1548 	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200) {
1549 		err = mmc_select_hs200(card);
1550 		if (err == -EBADMSG)
1551 			card->mmc_avail_type &= ~EXT_CSD_CARD_TYPE_HS200;
1552 		else
1553 			goto out;
1554 	}
1555 
1556 	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1557 		err = mmc_select_hs(card);
1558 
1559 out:
1560 	if (err && err != -EBADMSG)
1561 		return err;
1562 
1563 bus_speed:
1564 	/*
1565 	 * Set the bus speed to the selected bus timing.
1566 	 * If timing is not selected, backward compatible is the default.
1567 	 */
1568 	mmc_set_bus_speed(card);
1569 	return 0;
1570 }
1571 
1572 /*
1573  * Execute tuning sequence to seek the proper bus operating
1574  * conditions for HS200 and HS400, which sends CMD21 to the device.
1575  */
mmc_hs200_tuning(struct mmc_card * card)1576 static int mmc_hs200_tuning(struct mmc_card *card)
1577 {
1578 	struct mmc_host *host = card->host;
1579 
1580 	/*
1581 	 * Timing should be adjusted to the HS400 target
1582 	 * operation frequency for tuning process
1583 	 */
1584 	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1585 	    host->ios.bus_width == MMC_BUS_WIDTH_8)
1586 		if (host->ops->prepare_hs400_tuning)
1587 			host->ops->prepare_hs400_tuning(host, &host->ios);
1588 
1589 	return mmc_execute_tuning(card);
1590 }
1591 
1592 /*
1593  * Handle the detection and initialisation of a card.
1594  *
1595  * In the case of a resume, "oldcard" will contain the card
1596  * we're trying to reinitialise.
1597  */
mmc_init_card(struct mmc_host * host,u32 ocr,struct mmc_card * oldcard)1598 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1599 	struct mmc_card *oldcard)
1600 {
1601 	struct mmc_card *card;
1602 	int err;
1603 	u32 cid[4];
1604 	u32 rocr;
1605 
1606 	WARN_ON(!host->claimed);
1607 
1608 	/* Set correct bus mode for MMC before attempting init */
1609 	if (!mmc_host_is_spi(host))
1610 		mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1611 
1612 	/*
1613 	 * Since we're changing the OCR value, we seem to
1614 	 * need to tell some cards to go back to the idle
1615 	 * state.  We wait 1ms to give cards time to
1616 	 * respond.
1617 	 * mmc_go_idle is needed for eMMC that are asleep
1618 	 */
1619 	mmc_go_idle(host);
1620 
1621 	/* The extra bit indicates that we support high capacity */
1622 	err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1623 	if (err)
1624 		goto err;
1625 
1626 	/*
1627 	 * For SPI, enable CRC as appropriate.
1628 	 */
1629 	if (mmc_host_is_spi(host)) {
1630 		err = mmc_spi_set_crc(host, use_spi_crc);
1631 		if (err)
1632 			goto err;
1633 	}
1634 
1635 	/*
1636 	 * Fetch CID from card.
1637 	 */
1638 	err = mmc_send_cid(host, cid);
1639 	if (err)
1640 		goto err;
1641 
1642 	if (oldcard) {
1643 		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1644 			pr_debug("%s: Perhaps the card was replaced\n",
1645 				mmc_hostname(host));
1646 			err = -ENOENT;
1647 			goto err;
1648 		}
1649 
1650 		card = oldcard;
1651 	} else {
1652 		/*
1653 		 * Allocate card structure.
1654 		 */
1655 		card = mmc_alloc_card(host, &mmc_type);
1656 		if (IS_ERR(card)) {
1657 			err = PTR_ERR(card);
1658 			goto err;
1659 		}
1660 
1661 		card->ocr = ocr;
1662 		card->type = MMC_TYPE_MMC;
1663 		card->rca = 1;
1664 		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1665 	}
1666 
1667 	/*
1668 	 * Call the optional HC's init_card function to handle quirks.
1669 	 */
1670 	if (host->ops->init_card)
1671 		host->ops->init_card(host, card);
1672 
1673 	/*
1674 	 * For native busses:  set card RCA and quit open drain mode.
1675 	 */
1676 	if (!mmc_host_is_spi(host)) {
1677 		err = mmc_set_relative_addr(card);
1678 		if (err)
1679 			goto free_card;
1680 
1681 		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1682 	}
1683 
1684 	if (!oldcard) {
1685 		/*
1686 		 * Fetch CSD from card.
1687 		 */
1688 		err = mmc_send_csd(card, card->raw_csd);
1689 		if (err)
1690 			goto free_card;
1691 
1692 		err = mmc_decode_csd(card);
1693 		if (err)
1694 			goto free_card;
1695 		err = mmc_decode_cid(card);
1696 		if (err)
1697 			goto free_card;
1698 	}
1699 
1700 	/*
1701 	 * handling only for cards supporting DSR and hosts requesting
1702 	 * DSR configuration
1703 	 */
1704 	if (card->csd.dsr_imp && host->dsr_req)
1705 		mmc_set_dsr(host);
1706 
1707 	/*
1708 	 * Select card, as all following commands rely on that.
1709 	 */
1710 	if (!mmc_host_is_spi(host)) {
1711 		err = mmc_select_card(card);
1712 		if (err)
1713 			goto free_card;
1714 	}
1715 
1716 	if (!oldcard) {
1717 		/* Read extended CSD. */
1718 		err = mmc_read_ext_csd(card);
1719 		if (err)
1720 			goto free_card;
1721 
1722 		/*
1723 		 * If doing byte addressing, check if required to do sector
1724 		 * addressing.  Handle the case of <2GB cards needing sector
1725 		 * addressing.  See section 8.1 JEDEC Standard JED84-A441;
1726 		 * ocr register has bit 30 set for sector addressing.
1727 		 */
1728 		if (rocr & BIT(30))
1729 			mmc_card_set_blockaddr(card);
1730 
1731 		/* Erase size depends on CSD and Extended CSD */
1732 		mmc_set_erase_size(card);
1733 	}
1734 
1735 	/*
1736 	 * Reselect the card type since host caps could have been changed when
1737 	 * debugging even if the card is not new.
1738 	 */
1739 	mmc_select_card_type(card);
1740 
1741 	/* Enable ERASE_GRP_DEF. This bit is lost after a reset or power off. */
1742 	if (card->ext_csd.rev >= 3) {
1743 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1744 				 EXT_CSD_ERASE_GROUP_DEF, 1,
1745 				 card->ext_csd.generic_cmd6_time);
1746 
1747 		if (err && err != -EBADMSG)
1748 			goto free_card;
1749 
1750 		if (err) {
1751 			/*
1752 			 * Just disable enhanced area off & sz
1753 			 * will try to enable ERASE_GROUP_DEF
1754 			 * during next time reinit
1755 			 */
1756 			card->ext_csd.enhanced_area_offset = -EINVAL;
1757 			card->ext_csd.enhanced_area_size = -EINVAL;
1758 		} else {
1759 			card->ext_csd.erase_group_def = 1;
1760 			/*
1761 			 * enable ERASE_GRP_DEF successfully.
1762 			 * This will affect the erase size, so
1763 			 * here need to reset erase size
1764 			 */
1765 			mmc_set_erase_size(card);
1766 		}
1767 	}
1768 	mmc_set_wp_grp_size(card);
1769 	/*
1770 	 * Ensure eMMC user default partition is enabled
1771 	 */
1772 	if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1773 		card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1774 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1775 				 card->ext_csd.part_config,
1776 				 card->ext_csd.part_time);
1777 		if (err && err != -EBADMSG)
1778 			goto free_card;
1779 	}
1780 
1781 	/*
1782 	 * Enable power_off_notification byte in the ext_csd register
1783 	 */
1784 	if (card->ext_csd.rev >= 6) {
1785 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1786 				 EXT_CSD_POWER_OFF_NOTIFICATION,
1787 				 EXT_CSD_POWER_ON,
1788 				 card->ext_csd.generic_cmd6_time);
1789 		if (err && err != -EBADMSG)
1790 			goto free_card;
1791 
1792 		/*
1793 		 * The err can be -EBADMSG or 0,
1794 		 * so check for success and update the flag
1795 		 */
1796 		if (!err)
1797 			card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1798 	}
1799 
1800 	/* set erase_arg */
1801 	if (mmc_can_discard(card))
1802 		card->erase_arg = MMC_DISCARD_ARG;
1803 	else if (mmc_can_trim(card))
1804 		card->erase_arg = MMC_TRIM_ARG;
1805 	else
1806 		card->erase_arg = MMC_ERASE_ARG;
1807 
1808 	/*
1809 	 * Select timing interface
1810 	 */
1811 	err = mmc_select_timing(card);
1812 	if (err)
1813 		goto free_card;
1814 
1815 	if (mmc_card_hs200(card)) {
1816 		host->doing_init_tune = 1;
1817 
1818 		err = mmc_hs200_tuning(card);
1819 		if (!err)
1820 			err = mmc_select_hs400(card);
1821 
1822 		host->doing_init_tune = 0;
1823 
1824 		if (err)
1825 			goto free_card;
1826 	} else if (mmc_card_hs400es(card)) {
1827 		if (host->ops->execute_hs400_tuning) {
1828 			err = host->ops->execute_hs400_tuning(host, card);
1829 			if (err)
1830 				goto free_card;
1831 		}
1832 	} else {
1833 		/* Select the desired bus width optionally */
1834 		err = mmc_select_bus_width(card);
1835 		if (err > 0 && mmc_card_hs(card)) {
1836 			err = mmc_select_hs_ddr(card);
1837 			if (err)
1838 				goto free_card;
1839 		}
1840 	}
1841 
1842 	/*
1843 	 * Choose the power class with selected bus interface
1844 	 */
1845 	mmc_select_powerclass(card);
1846 
1847 	/*
1848 	 * Enable HPI feature (if supported)
1849 	 */
1850 	if (card->ext_csd.hpi) {
1851 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1852 				EXT_CSD_HPI_MGMT, 1,
1853 				card->ext_csd.generic_cmd6_time);
1854 		if (err && err != -EBADMSG)
1855 			goto free_card;
1856 		if (err) {
1857 			pr_warn("%s: Enabling HPI failed\n",
1858 				mmc_hostname(card->host));
1859 			card->ext_csd.hpi_en = 0;
1860 		} else {
1861 			card->ext_csd.hpi_en = 1;
1862 		}
1863 	}
1864 
1865 	/*
1866 	 * If cache size is higher than 0, this indicates the existence of cache
1867 	 * and it can be turned on. Note that some eMMCs from Micron has been
1868 	 * reported to need ~800 ms timeout, while enabling the cache after
1869 	 * sudden power failure tests. Let's extend the timeout to a minimum of
1870 	 * DEFAULT_CACHE_EN_TIMEOUT_MS and do it for all cards.
1871 	 */
1872 	if (card->ext_csd.cache_size > 0) {
1873 		unsigned int timeout_ms = MIN_CACHE_EN_TIMEOUT_MS;
1874 
1875 		timeout_ms = max(card->ext_csd.generic_cmd6_time, timeout_ms);
1876 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1877 				EXT_CSD_CACHE_CTRL, 1, timeout_ms);
1878 		if (err && err != -EBADMSG)
1879 			goto free_card;
1880 
1881 		/*
1882 		 * Only if no error, cache is turned on successfully.
1883 		 */
1884 		if (err) {
1885 			pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1886 				mmc_hostname(card->host), err);
1887 			card->ext_csd.cache_ctrl = 0;
1888 		} else {
1889 			card->ext_csd.cache_ctrl = 1;
1890 		}
1891 	}
1892 
1893 	/*
1894 	 * Enable Command Queue if supported. Note that Packed Commands cannot
1895 	 * be used with Command Queue.
1896 	 */
1897 	card->ext_csd.cmdq_en = false;
1898 	if (card->ext_csd.cmdq_support && host->caps2 & MMC_CAP2_CQE) {
1899 		err = mmc_cmdq_enable(card);
1900 		if (err && err != -EBADMSG)
1901 			goto free_card;
1902 		if (err) {
1903 			pr_warn("%s: Enabling CMDQ failed\n",
1904 				mmc_hostname(card->host));
1905 			card->ext_csd.cmdq_support = false;
1906 			card->ext_csd.cmdq_depth = 0;
1907 		}
1908 	}
1909 	/*
1910 	 * In some cases (e.g. RPMB or mmc_test), the Command Queue must be
1911 	 * disabled for a time, so a flag is needed to indicate to re-enable the
1912 	 * Command Queue.
1913 	 */
1914 	card->reenable_cmdq = card->ext_csd.cmdq_en;
1915 
1916 	if (host->cqe_ops && !host->cqe_enabled) {
1917 		err = host->cqe_ops->cqe_enable(host, card);
1918 		if (!err) {
1919 			host->cqe_enabled = true;
1920 
1921 			if (card->ext_csd.cmdq_en) {
1922 				pr_info("%s: Command Queue Engine enabled\n",
1923 					mmc_hostname(host));
1924 			} else {
1925 				host->hsq_enabled = true;
1926 				pr_info("%s: Host Software Queue enabled\n",
1927 					mmc_hostname(host));
1928 			}
1929 		}
1930 	}
1931 
1932 	if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1933 	    host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1934 		pr_err("%s: Host failed to negotiate down from 3.3V\n",
1935 			mmc_hostname(host));
1936 		err = -EINVAL;
1937 		goto free_card;
1938 	}
1939 
1940 	if (!oldcard)
1941 		host->card = card;
1942 
1943 	return 0;
1944 
1945 free_card:
1946 	if (!oldcard)
1947 		mmc_remove_card(card);
1948 err:
1949 	return err;
1950 }
1951 
mmc_can_sleep(struct mmc_card * card)1952 static int mmc_can_sleep(struct mmc_card *card)
1953 {
1954 	return card->ext_csd.rev >= 3;
1955 }
1956 
mmc_sleep_busy_cb(void * cb_data,bool * busy)1957 static int mmc_sleep_busy_cb(void *cb_data, bool *busy)
1958 {
1959 	struct mmc_host *host = cb_data;
1960 
1961 	*busy = host->ops->card_busy(host);
1962 	return 0;
1963 }
1964 
mmc_sleep(struct mmc_host * host)1965 static int mmc_sleep(struct mmc_host *host)
1966 {
1967 	struct mmc_command cmd = {};
1968 	struct mmc_card *card = host->card;
1969 	unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1970 	bool use_r1b_resp;
1971 	int err;
1972 
1973 	/* Re-tuning can't be done once the card is deselected */
1974 	mmc_retune_hold(host);
1975 
1976 	err = mmc_deselect_cards(host);
1977 	if (err)
1978 		goto out_release;
1979 
1980 	cmd.opcode = MMC_SLEEP_AWAKE;
1981 	cmd.arg = card->rca << 16;
1982 	cmd.arg |= 1 << 15;
1983 	use_r1b_resp = mmc_prepare_busy_cmd(host, &cmd, timeout_ms);
1984 
1985 	err = mmc_wait_for_cmd(host, &cmd, 0);
1986 	if (err)
1987 		goto out_release;
1988 
1989 	/*
1990 	 * If the host does not wait while the card signals busy, then we can
1991 	 * try to poll, but only if the host supports HW polling, as the
1992 	 * SEND_STATUS cmd is not allowed. If we can't poll, then we simply need
1993 	 * to wait the sleep/awake timeout.
1994 	 */
1995 	if (host->caps & MMC_CAP_WAIT_WHILE_BUSY && use_r1b_resp)
1996 		goto out_release;
1997 
1998 	if (!host->ops->card_busy) {
1999 		mmc_delay(timeout_ms);
2000 		goto out_release;
2001 	}
2002 
2003 	err = __mmc_poll_for_busy(host, 0, timeout_ms, &mmc_sleep_busy_cb, host);
2004 
2005 out_release:
2006 	mmc_retune_release(host);
2007 	return err;
2008 }
2009 
mmc_can_poweroff_notify(const struct mmc_card * card)2010 static int mmc_can_poweroff_notify(const struct mmc_card *card)
2011 {
2012 	return card &&
2013 		mmc_card_mmc(card) &&
2014 		(card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
2015 }
2016 
mmc_poweroff_notify(struct mmc_card * card,unsigned int notify_type)2017 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
2018 {
2019 	unsigned int timeout = card->ext_csd.generic_cmd6_time;
2020 	int err;
2021 
2022 	/* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
2023 	if (notify_type == EXT_CSD_POWER_OFF_LONG)
2024 		timeout = card->ext_csd.power_off_longtime;
2025 
2026 	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2027 			EXT_CSD_POWER_OFF_NOTIFICATION,
2028 			notify_type, timeout, 0, false, false, MMC_CMD_RETRIES);
2029 	if (err)
2030 		pr_err("%s: Power Off Notification timed out, %u\n",
2031 		       mmc_hostname(card->host), timeout);
2032 
2033 	/* Disable the power off notification after the switch operation. */
2034 	card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
2035 
2036 	return err;
2037 }
2038 
2039 /*
2040  * Host is being removed. Free up the current card.
2041  */
mmc_remove(struct mmc_host * host)2042 static void mmc_remove(struct mmc_host *host)
2043 {
2044 	mmc_remove_card(host->card);
2045 	host->card = NULL;
2046 }
2047 
2048 /*
2049  * Card detection - card is alive.
2050  */
mmc_alive(struct mmc_host * host)2051 static int mmc_alive(struct mmc_host *host)
2052 {
2053 	return mmc_send_status(host->card, NULL);
2054 }
2055 
2056 /*
2057  * Card detection callback from host.
2058  */
mmc_detect(struct mmc_host * host)2059 static void mmc_detect(struct mmc_host *host)
2060 {
2061 	int err;
2062 
2063 	mmc_get_card(host->card, NULL);
2064 
2065 	/*
2066 	 * Just check if our card has been removed.
2067 	 */
2068 	err = _mmc_detect_card_removed(host);
2069 
2070 	mmc_put_card(host->card, NULL);
2071 
2072 	if (err) {
2073 		mmc_remove(host);
2074 
2075 		mmc_claim_host(host);
2076 		mmc_detach_bus(host);
2077 		mmc_power_off(host);
2078 		mmc_release_host(host);
2079 	}
2080 }
2081 
_mmc_cache_enabled(struct mmc_host * host)2082 static bool _mmc_cache_enabled(struct mmc_host *host)
2083 {
2084 	return host->card->ext_csd.cache_size > 0 &&
2085 	       host->card->ext_csd.cache_ctrl & 1;
2086 }
2087 
2088 /*
2089  * Flush the internal cache of the eMMC to non-volatile storage.
2090  */
_mmc_flush_cache(struct mmc_host * host)2091 static int _mmc_flush_cache(struct mmc_host *host)
2092 {
2093 	int err = 0;
2094 
2095 	if (mmc_card_broken_cache_flush(host->card) && !host->card->written_flag)
2096 		return 0;
2097 
2098 	if (_mmc_cache_enabled(host)) {
2099 		err = mmc_switch(host->card, EXT_CSD_CMD_SET_NORMAL,
2100 				 EXT_CSD_FLUSH_CACHE, 1,
2101 				 CACHE_FLUSH_TIMEOUT_MS);
2102 		if (err)
2103 			pr_err("%s: cache flush error %d\n", mmc_hostname(host), err);
2104 		else
2105 			host->card->written_flag = false;
2106 	}
2107 
2108 	return err;
2109 }
2110 
_mmc_suspend(struct mmc_host * host,bool is_suspend)2111 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
2112 {
2113 	int err = 0;
2114 	unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
2115 					EXT_CSD_POWER_OFF_LONG;
2116 
2117 	mmc_claim_host(host);
2118 
2119 	if (mmc_card_suspended(host->card))
2120 		goto out;
2121 
2122 	err = _mmc_flush_cache(host);
2123 	if (err)
2124 		goto out;
2125 
2126 	if (mmc_can_poweroff_notify(host->card) &&
2127 	    ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend ||
2128 	     (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND)))
2129 		err = mmc_poweroff_notify(host->card, notify_type);
2130 	else if (mmc_can_sleep(host->card))
2131 		err = mmc_sleep(host);
2132 	else if (!mmc_host_is_spi(host))
2133 		err = mmc_deselect_cards(host);
2134 
2135 	if (!err) {
2136 		mmc_power_off(host);
2137 		mmc_card_set_suspended(host->card);
2138 	}
2139 out:
2140 	mmc_release_host(host);
2141 	return err;
2142 }
2143 
2144 /*
2145  * Suspend callback
2146  */
mmc_suspend(struct mmc_host * host)2147 static int mmc_suspend(struct mmc_host *host)
2148 {
2149 	int err;
2150 
2151 	err = _mmc_suspend(host, true);
2152 	if (!err) {
2153 		pm_runtime_disable(&host->card->dev);
2154 		pm_runtime_set_suspended(&host->card->dev);
2155 	}
2156 
2157 	return err;
2158 }
2159 
2160 /*
2161  * This function tries to determine if the same card is still present
2162  * and, if so, restore all state to it.
2163  */
_mmc_resume(struct mmc_host * host)2164 static int _mmc_resume(struct mmc_host *host)
2165 {
2166 	int err = 0;
2167 
2168 	mmc_claim_host(host);
2169 
2170 	if (!mmc_card_suspended(host->card))
2171 		goto out;
2172 
2173 	mmc_power_up(host, host->card->ocr);
2174 	err = mmc_init_card(host, host->card->ocr, host->card);
2175 	mmc_card_clr_suspended(host->card);
2176 
2177 out:
2178 	mmc_release_host(host);
2179 	return err;
2180 }
2181 
2182 /*
2183  * Shutdown callback
2184  */
mmc_shutdown(struct mmc_host * host)2185 static int mmc_shutdown(struct mmc_host *host)
2186 {
2187 	int err = 0;
2188 
2189 	/*
2190 	 * In a specific case for poweroff notify, we need to resume the card
2191 	 * before we can shutdown it properly.
2192 	 */
2193 	if (mmc_can_poweroff_notify(host->card) &&
2194 		!(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
2195 		err = _mmc_resume(host);
2196 
2197 	if (!err)
2198 		err = _mmc_suspend(host, false);
2199 
2200 	return err;
2201 }
2202 
2203 /*
2204  * Callback for resume.
2205  */
mmc_resume(struct mmc_host * host)2206 static int mmc_resume(struct mmc_host *host)
2207 {
2208 	pm_runtime_enable(&host->card->dev);
2209 	return 0;
2210 }
2211 
2212 /*
2213  * Callback for runtime_suspend.
2214  */
mmc_runtime_suspend(struct mmc_host * host)2215 static int mmc_runtime_suspend(struct mmc_host *host)
2216 {
2217 	int err;
2218 
2219 	if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
2220 		return 0;
2221 
2222 	err = _mmc_suspend(host, true);
2223 	if (err)
2224 		pr_err("%s: error %d doing aggressive suspend\n",
2225 			mmc_hostname(host), err);
2226 
2227 	return err;
2228 }
2229 
2230 /*
2231  * Callback for runtime_resume.
2232  */
mmc_runtime_resume(struct mmc_host * host)2233 static int mmc_runtime_resume(struct mmc_host *host)
2234 {
2235 	int err;
2236 
2237 	err = _mmc_resume(host);
2238 	if (err && err != -ENOMEDIUM)
2239 		pr_err("%s: error %d doing runtime resume\n",
2240 			mmc_hostname(host), err);
2241 
2242 	return 0;
2243 }
2244 
mmc_can_reset(struct mmc_card * card)2245 static int mmc_can_reset(struct mmc_card *card)
2246 {
2247 	u8 rst_n_function;
2248 
2249 	rst_n_function = card->ext_csd.rst_n_function;
2250 	if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2251 		return 0;
2252 	return 1;
2253 }
2254 
_mmc_hw_reset(struct mmc_host * host)2255 static int _mmc_hw_reset(struct mmc_host *host)
2256 {
2257 	struct mmc_card *card = host->card;
2258 
2259 	/*
2260 	 * In the case of recovery, we can't expect flushing the cache to work
2261 	 * always, but we have a go and ignore errors.
2262 	 */
2263 	_mmc_flush_cache(host);
2264 
2265 	if ((host->caps & MMC_CAP_HW_RESET) && host->ops->card_hw_reset &&
2266 	     mmc_can_reset(card)) {
2267 		/* If the card accept RST_n signal, send it. */
2268 		mmc_set_clock(host, host->f_init);
2269 		host->ops->card_hw_reset(host);
2270 		/* Set initial state and call mmc_set_ios */
2271 		mmc_set_initial_state(host);
2272 	} else {
2273 		/* Do a brute force power cycle */
2274 		mmc_power_cycle(host, card->ocr);
2275 		mmc_pwrseq_reset(host);
2276 	}
2277 	return mmc_init_card(host, card->ocr, card);
2278 }
2279 
2280 static const struct mmc_bus_ops mmc_ops = {
2281 	.remove = mmc_remove,
2282 	.detect = mmc_detect,
2283 	.suspend = mmc_suspend,
2284 	.resume = mmc_resume,
2285 	.runtime_suspend = mmc_runtime_suspend,
2286 	.runtime_resume = mmc_runtime_resume,
2287 	.alive = mmc_alive,
2288 	.shutdown = mmc_shutdown,
2289 	.hw_reset = _mmc_hw_reset,
2290 	.cache_enabled = _mmc_cache_enabled,
2291 	.flush_cache = _mmc_flush_cache,
2292 };
2293 
2294 /*
2295  * Starting point for MMC card init.
2296  */
mmc_attach_mmc(struct mmc_host * host)2297 int mmc_attach_mmc(struct mmc_host *host)
2298 {
2299 	int err;
2300 	u32 ocr, rocr;
2301 
2302 	WARN_ON(!host->claimed);
2303 
2304 	/* Set correct bus mode for MMC before attempting attach */
2305 	if (!mmc_host_is_spi(host))
2306 		mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
2307 
2308 	err = mmc_send_op_cond(host, 0, &ocr);
2309 	if (err)
2310 		return err;
2311 
2312 	mmc_attach_bus(host, &mmc_ops);
2313 	if (host->ocr_avail_mmc)
2314 		host->ocr_avail = host->ocr_avail_mmc;
2315 
2316 	/*
2317 	 * We need to get OCR a different way for SPI.
2318 	 */
2319 	if (mmc_host_is_spi(host)) {
2320 		err = mmc_spi_read_ocr(host, 1, &ocr);
2321 		if (err)
2322 			goto err;
2323 	}
2324 
2325 	rocr = mmc_select_voltage(host, ocr);
2326 
2327 	/*
2328 	 * Can we support the voltage of the card?
2329 	 */
2330 	if (!rocr) {
2331 		err = -EINVAL;
2332 		goto err;
2333 	}
2334 
2335 	/*
2336 	 * Detect and init the card.
2337 	 */
2338 	err = mmc_init_card(host, rocr, NULL);
2339 	if (err)
2340 		goto err;
2341 
2342 	mmc_release_host(host);
2343 	err = mmc_add_card(host->card);
2344 	if (err)
2345 		goto remove_card;
2346 
2347 	mmc_claim_host(host);
2348 	return 0;
2349 
2350 remove_card:
2351 	mmc_remove_card(host->card);
2352 	mmc_claim_host(host);
2353 	host->card = NULL;
2354 err:
2355 	mmc_detach_bus(host);
2356 
2357 	pr_err("%s: error %d whilst initialising MMC card\n",
2358 		mmc_hostname(host), err);
2359 
2360 	return err;
2361 }
2362