2 * linux/drivers/mmc/sd.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/err.h>
15 #include <linux/mmc/host.h>
16 #include <linux/mmc/card.h>
17 #include <linux/mmc/mmc.h>
18 #include <linux/mmc/sd.h>
27 static const unsigned int tran_exp
[] = {
28 10000, 100000, 1000000, 10000000,
32 static const unsigned char tran_mant
[] = {
33 0, 10, 12, 13, 15, 20, 25, 30,
34 35, 40, 45, 50, 55, 60, 70, 80,
37 static const unsigned int tacc_exp
[] = {
38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
41 static const unsigned int tacc_mant
[] = {
42 0, 10, 12, 13, 15, 20, 25, 30,
43 35, 40, 45, 50, 55, 60, 70, 80,
46 #define UNSTUFF_BITS(resp,start,size) \
48 const int __size = size; \
49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
50 const int __off = 3 - ((start) / 32); \
51 const int __shft = (start) & 31; \
54 __res = resp[__off] >> __shft; \
55 if (__size + __shft > 32) \
56 __res |= resp[__off-1] << ((32 - __shft) % 32); \
61 * Given the decoded CSD structure, decode the raw CID to our CID structure.
63 static void mmc_decode_cid(struct mmc_card
*card
)
65 u32
*resp
= card
->raw_cid
;
67 memset(&card
->cid
, 0, sizeof(struct mmc_cid
));
70 * SD doesn't currently have a version field so we will
71 * have to assume we can parse this.
73 card
->cid
.manfid
= UNSTUFF_BITS(resp
, 120, 8);
74 card
->cid
.oemid
= UNSTUFF_BITS(resp
, 104, 16);
75 card
->cid
.prod_name
[0] = UNSTUFF_BITS(resp
, 96, 8);
76 card
->cid
.prod_name
[1] = UNSTUFF_BITS(resp
, 88, 8);
77 card
->cid
.prod_name
[2] = UNSTUFF_BITS(resp
, 80, 8);
78 card
->cid
.prod_name
[3] = UNSTUFF_BITS(resp
, 72, 8);
79 card
->cid
.prod_name
[4] = UNSTUFF_BITS(resp
, 64, 8);
80 card
->cid
.hwrev
= UNSTUFF_BITS(resp
, 60, 4);
81 card
->cid
.fwrev
= UNSTUFF_BITS(resp
, 56, 4);
82 card
->cid
.serial
= UNSTUFF_BITS(resp
, 24, 32);
83 card
->cid
.year
= UNSTUFF_BITS(resp
, 12, 8);
84 card
->cid
.month
= UNSTUFF_BITS(resp
, 8, 4);
86 card
->cid
.year
+= 2000; /* SD cards year offset */
90 * Given a 128-bit response, decode to our card CSD structure.
92 static int mmc_decode_csd(struct mmc_card
*card
)
94 struct mmc_csd
*csd
= &card
->csd
;
95 unsigned int e
, m
, csd_struct
;
96 u32
*resp
= card
->raw_csd
;
98 csd_struct
= UNSTUFF_BITS(resp
, 126, 2);
100 switch (csd_struct
) {
102 m
= UNSTUFF_BITS(resp
, 115, 4);
103 e
= UNSTUFF_BITS(resp
, 112, 3);
104 csd
->tacc_ns
= (tacc_exp
[e
] * tacc_mant
[m
] + 9) / 10;
105 csd
->tacc_clks
= UNSTUFF_BITS(resp
, 104, 8) * 100;
107 m
= UNSTUFF_BITS(resp
, 99, 4);
108 e
= UNSTUFF_BITS(resp
, 96, 3);
109 csd
->max_dtr
= tran_exp
[e
] * tran_mant
[m
];
110 csd
->cmdclass
= UNSTUFF_BITS(resp
, 84, 12);
112 e
= UNSTUFF_BITS(resp
, 47, 3);
113 m
= UNSTUFF_BITS(resp
, 62, 12);
114 csd
->capacity
= (1 + m
) << (e
+ 2);
116 csd
->read_blkbits
= UNSTUFF_BITS(resp
, 80, 4);
117 csd
->read_partial
= UNSTUFF_BITS(resp
, 79, 1);
118 csd
->write_misalign
= UNSTUFF_BITS(resp
, 78, 1);
119 csd
->read_misalign
= UNSTUFF_BITS(resp
, 77, 1);
120 csd
->r2w_factor
= UNSTUFF_BITS(resp
, 26, 3);
121 csd
->write_blkbits
= UNSTUFF_BITS(resp
, 22, 4);
122 csd
->write_partial
= UNSTUFF_BITS(resp
, 21, 1);
126 * This is a block-addressed SDHC card. Most
127 * interesting fields are unused and have fixed
128 * values. To avoid getting tripped by buggy cards,
129 * we assume those fixed values ourselves.
131 mmc_card_set_blockaddr(card
);
133 csd
->tacc_ns
= 0; /* Unused */
134 csd
->tacc_clks
= 0; /* Unused */
136 m
= UNSTUFF_BITS(resp
, 99, 4);
137 e
= UNSTUFF_BITS(resp
, 96, 3);
138 csd
->max_dtr
= tran_exp
[e
] * tran_mant
[m
];
139 csd
->cmdclass
= UNSTUFF_BITS(resp
, 84, 12);
141 m
= UNSTUFF_BITS(resp
, 48, 22);
142 csd
->capacity
= (1 + m
) << 10;
144 csd
->read_blkbits
= 9;
145 csd
->read_partial
= 0;
146 csd
->write_misalign
= 0;
147 csd
->read_misalign
= 0;
148 csd
->r2w_factor
= 4; /* Unused */
149 csd
->write_blkbits
= 9;
150 csd
->write_partial
= 0;
153 printk("%s: unrecognised CSD structure version %d\n",
154 mmc_hostname(card
->host
), csd_struct
);
162 * Given a 64-bit response, decode to our card SCR structure.
164 static int mmc_decode_scr(struct mmc_card
*card
)
166 struct sd_scr
*scr
= &card
->scr
;
167 unsigned int scr_struct
;
170 BUG_ON(!mmc_card_sd(card
));
172 resp
[3] = card
->raw_scr
[1];
173 resp
[2] = card
->raw_scr
[0];
175 scr_struct
= UNSTUFF_BITS(resp
, 60, 4);
176 if (scr_struct
!= 0) {
177 printk("%s: unrecognised SCR structure version %d\n",
178 mmc_hostname(card
->host
), scr_struct
);
182 scr
->sda_vsn
= UNSTUFF_BITS(resp
, 56, 4);
183 scr
->bus_widths
= UNSTUFF_BITS(resp
, 48, 4);
189 * Fetches and decodes switch information
191 static int mmc_read_switch(struct mmc_card
*card
)
196 if (card
->scr
.sda_vsn
< SCR_SPEC_VER_1
)
199 if (!(card
->csd
.cmdclass
& CCC_SWITCH
)) {
200 printk(KERN_WARNING
"%s: card lacks mandatory switch "
201 "function, performance might suffer.\n",
202 mmc_hostname(card
->host
));
206 err
= MMC_ERR_FAILED
;
208 status
= kmalloc(64, GFP_KERNEL
);
210 printk("%s: could not allocate a buffer for switch "
212 mmc_hostname(card
->host
));
216 err
= mmc_sd_switch(card
, 0, 0, 1, status
);
217 if (err
!= MMC_ERR_NONE
) {
218 printk(KERN_WARNING
"%s: problem reading switch "
219 "capabilities, performance might suffer.\n",
220 mmc_hostname(card
->host
));
225 if (status
[13] & 0x02)
226 card
->sw_caps
.hs_max_dtr
= 50000000;
235 * Test if the card supports high-speed mode and, if so, switch to it.
237 static int mmc_switch_hs(struct mmc_card
*card
)
242 if (card
->scr
.sda_vsn
< SCR_SPEC_VER_1
)
245 if (!(card
->csd
.cmdclass
& CCC_SWITCH
))
248 if (!(card
->host
->caps
& MMC_CAP_SD_HIGHSPEED
))
251 if (card
->sw_caps
.hs_max_dtr
== 0)
254 err
= MMC_ERR_FAILED
;
256 status
= kmalloc(64, GFP_KERNEL
);
258 printk("%s: could not allocate a buffer for switch "
260 mmc_hostname(card
->host
));
264 err
= mmc_sd_switch(card
, 1, 0, 1, status
);
265 if (err
!= MMC_ERR_NONE
)
268 if ((status
[16] & 0xF) != 1) {
269 printk(KERN_WARNING
"%s: Problem switching card "
270 "into high-speed mode!\n",
271 mmc_hostname(card
->host
));
273 mmc_card_set_highspeed(card
);
274 mmc_set_timing(card
->host
, MMC_TIMING_SD_HS
);
284 * Handle the detection and initialisation of a card.
286 * In the case of a resume, "curcard" will contain the card
287 * we're trying to reinitialise.
289 static int mmc_sd_init_card(struct mmc_host
*host
, u32 ocr
,
290 struct mmc_card
*oldcard
)
292 struct mmc_card
*card
;
295 unsigned int max_dtr
;
298 BUG_ON(!host
->claimed
);
301 * Since we're changing the OCR value, we seem to
302 * need to tell some cards to go back to the idle
303 * state. We wait 1ms to give cards time to
309 * If SD_SEND_IF_COND indicates an SD 2.0
310 * compliant card and we should set bit 30
311 * of the ocr to indicate that we can handle
312 * block-addressed SDHC cards.
314 err
= mmc_send_if_cond(host
, ocr
);
315 if (err
== MMC_ERR_NONE
)
318 err
= mmc_send_app_op_cond(host
, ocr
, NULL
);
319 if (err
!= MMC_ERR_NONE
)
323 * Fetch CID from card.
325 err
= mmc_all_send_cid(host
, cid
);
326 if (err
!= MMC_ERR_NONE
)
330 if (memcmp(cid
, oldcard
->raw_cid
, sizeof(cid
)) != 0)
336 * Allocate card structure.
338 card
= mmc_alloc_card(host
);
342 card
->type
= MMC_TYPE_SD
;
343 memcpy(card
->raw_cid
, cid
, sizeof(card
->raw_cid
));
349 err
= mmc_send_relative_addr(host
, &card
->rca
);
350 if (err
!= MMC_ERR_NONE
)
353 mmc_set_bus_mode(host
, MMC_BUSMODE_PUSHPULL
);
357 * Fetch CSD from card.
359 err
= mmc_send_csd(card
, card
->raw_csd
);
360 if (err
!= MMC_ERR_NONE
)
363 err
= mmc_decode_csd(card
);
367 mmc_decode_cid(card
);
371 * Select card, as all following commands rely on that.
373 err
= mmc_select_card(card
);
374 if (err
!= MMC_ERR_NONE
)
379 * Fetch SCR from card.
381 err
= mmc_app_send_scr(card
, card
->raw_scr
);
382 if (err
!= MMC_ERR_NONE
)
385 err
= mmc_decode_scr(card
);
390 * Fetch switch information from card.
392 err
= mmc_read_switch(card
);
393 if (err
!= MMC_ERR_NONE
)
398 * Attempt to change to high-speed (if supported)
400 err
= mmc_switch_hs(card
);
401 if (err
!= MMC_ERR_NONE
)
407 max_dtr
= (unsigned int)-1;
409 if (mmc_card_highspeed(card
)) {
410 if (max_dtr
> card
->sw_caps
.hs_max_dtr
)
411 max_dtr
= card
->sw_caps
.hs_max_dtr
;
412 } else if (max_dtr
> card
->csd
.max_dtr
) {
413 max_dtr
= card
->csd
.max_dtr
;
416 mmc_set_clock(host
, max_dtr
);
419 * Switch to wider bus (if supported).
421 if ((host
->caps
& MMC_CAP_4_BIT_DATA
) &&
422 (card
->scr
.bus_widths
& SD_SCR_BUS_WIDTH_4
)) {
423 err
= mmc_app_set_bus_width(card
, MMC_BUS_WIDTH_4
);
424 if (err
!= MMC_ERR_NONE
)
427 mmc_set_bus_width(host
, MMC_BUS_WIDTH_4
);
431 * Check if read-only switch is active.
434 if (!host
->ops
->get_ro
) {
435 printk(KERN_WARNING
"%s: host does not "
436 "support reading read-only "
437 "switch. assuming write-enable.\n",
440 if (host
->ops
->get_ro(host
))
441 mmc_card_set_readonly(card
);
452 mmc_remove_card(card
);
455 return MMC_ERR_FAILED
;
459 * Host is being removed. Free up the current card.
461 static void mmc_sd_remove(struct mmc_host
*host
)
466 mmc_remove_card(host
->card
);
471 * Card detection callback from host.
473 static void mmc_sd_detect(struct mmc_host
*host
)
480 mmc_claim_host(host
);
483 * Just check if our card has been removed.
485 err
= mmc_send_status(host
->card
, NULL
);
487 mmc_release_host(host
);
489 if (err
!= MMC_ERR_NONE
) {
490 mmc_remove_card(host
->card
);
493 mmc_claim_host(host
);
494 mmc_detach_bus(host
);
495 mmc_release_host(host
);
499 #ifdef CONFIG_MMC_UNSAFE_RESUME
502 * Suspend callback from host.
504 static void mmc_sd_suspend(struct mmc_host
*host
)
509 mmc_claim_host(host
);
510 mmc_deselect_cards(host
);
511 host
->card
->state
&= ~MMC_STATE_HIGHSPEED
;
512 mmc_release_host(host
);
516 * Resume callback from host.
518 * This function tries to determine if the same card is still present
519 * and, if so, restore all state to it.
521 static void mmc_sd_resume(struct mmc_host
*host
)
528 mmc_claim_host(host
);
530 err
= mmc_sd_init_card(host
, host
->ocr
, host
->card
);
531 if (err
!= MMC_ERR_NONE
) {
532 mmc_remove_card(host
->card
);
535 mmc_detach_bus(host
);
538 mmc_release_host(host
);
543 #define mmc_sd_suspend NULL
544 #define mmc_sd_resume NULL
548 static const struct mmc_bus_ops mmc_sd_ops
= {
549 .remove
= mmc_sd_remove
,
550 .detect
= mmc_sd_detect
,
551 .suspend
= mmc_sd_suspend
,
552 .resume
= mmc_sd_resume
,
556 * Starting point for SD card init.
558 int mmc_attach_sd(struct mmc_host
*host
, u32 ocr
)
563 BUG_ON(!host
->claimed
);
565 mmc_attach_bus(host
, &mmc_sd_ops
);
568 * Sanity check the voltages that the card claims to
572 printk(KERN_WARNING
"%s: card claims to support voltages "
573 "below the defined range. These will be ignored.\n",
578 if (ocr
& MMC_VDD_165_195
) {
579 printk(KERN_WARNING
"%s: SD card claims to support the "
580 "incompletely defined 'low voltage range'. This "
581 "will be ignored.\n", mmc_hostname(host
));
582 ocr
&= ~MMC_VDD_165_195
;
585 host
->ocr
= mmc_select_voltage(host
, ocr
);
588 * Can we support the voltage(s) of the card(s)?
594 * Detect and init the card.
596 err
= mmc_sd_init_card(host
, host
->ocr
, NULL
);
597 if (err
!= MMC_ERR_NONE
)
600 mmc_release_host(host
);
602 err
= mmc_register_card(host
->card
);
609 mmc_claim_host(host
);
610 mmc_remove_card(host
->card
);
613 mmc_detach_bus(host
);
614 mmc_release_host(host
);
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