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1407 lines
33 KiB
1407 lines
33 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* linux/drivers/mmc/core/sd.c |
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* |
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* Copyright (C) 2003-2004 Russell King, All Rights Reserved. |
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* SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
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* Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. |
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*/ |
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|
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#include <linux/err.h> |
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#include <linux/sizes.h> |
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#include <linux/slab.h> |
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#include <linux/stat.h> |
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#include <linux/pm_runtime.h> |
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|
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#include <linux/mmc/host.h> |
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#include <linux/mmc/card.h> |
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#include <linux/mmc/mmc.h> |
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#include <linux/mmc/sd.h> |
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|
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#include "core.h" |
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#include "card.h" |
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#include "host.h" |
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#include "bus.h" |
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#include "mmc_ops.h" |
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#include "sd.h" |
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#include "sd_ops.h" |
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|
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static const unsigned int tran_exp[] = { |
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10000, 100000, 1000000, 10000000, |
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0, 0, 0, 0 |
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}; |
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|
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static const unsigned char tran_mant[] = { |
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0, 10, 12, 13, 15, 20, 25, 30, |
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35, 40, 45, 50, 55, 60, 70, 80, |
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}; |
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|
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static const unsigned int taac_exp[] = { |
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1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, |
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}; |
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|
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static const unsigned int taac_mant[] = { |
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0, 10, 12, 13, 15, 20, 25, 30, |
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35, 40, 45, 50, 55, 60, 70, 80, |
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}; |
|
|
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static const unsigned int sd_au_size[] = { |
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0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512, |
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SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512, |
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SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512, |
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SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512, |
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}; |
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|
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#define UNSTUFF_BITS(resp,start,size) \ |
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({ \ |
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const int __size = size; \ |
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const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ |
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const int __off = 3 - ((start) / 32); \ |
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const int __shft = (start) & 31; \ |
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u32 __res; \ |
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\ |
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__res = resp[__off] >> __shft; \ |
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if (__size + __shft > 32) \ |
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__res |= resp[__off-1] << ((32 - __shft) % 32); \ |
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__res & __mask; \ |
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}) |
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|
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/* |
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* Given the decoded CSD structure, decode the raw CID to our CID structure. |
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*/ |
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void mmc_decode_cid(struct mmc_card *card) |
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{ |
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u32 *resp = card->raw_cid; |
|
|
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/* |
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* SD doesn't currently have a version field so we will |
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* have to assume we can parse this. |
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*/ |
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card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); |
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card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); |
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card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); |
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card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); |
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card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); |
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card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); |
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card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); |
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card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); |
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card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); |
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card->cid.serial = UNSTUFF_BITS(resp, 24, 32); |
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card->cid.year = UNSTUFF_BITS(resp, 12, 8); |
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card->cid.month = UNSTUFF_BITS(resp, 8, 4); |
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|
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card->cid.year += 2000; /* SD cards year offset */ |
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} |
|
|
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/* |
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* Given a 128-bit response, decode to our card CSD structure. |
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*/ |
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static int mmc_decode_csd(struct mmc_card *card) |
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{ |
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struct mmc_csd *csd = &card->csd; |
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unsigned int e, m, csd_struct; |
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u32 *resp = card->raw_csd; |
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|
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csd_struct = UNSTUFF_BITS(resp, 126, 2); |
|
|
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switch (csd_struct) { |
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case 0: |
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m = UNSTUFF_BITS(resp, 115, 4); |
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e = UNSTUFF_BITS(resp, 112, 3); |
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csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10; |
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csd->taac_clks = UNSTUFF_BITS(resp, 104, 8) * 100; |
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|
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m = UNSTUFF_BITS(resp, 99, 4); |
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e = UNSTUFF_BITS(resp, 96, 3); |
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csd->max_dtr = tran_exp[e] * tran_mant[m]; |
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csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); |
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|
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e = UNSTUFF_BITS(resp, 47, 3); |
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m = UNSTUFF_BITS(resp, 62, 12); |
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csd->capacity = (1 + m) << (e + 2); |
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|
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csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); |
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csd->read_partial = UNSTUFF_BITS(resp, 79, 1); |
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csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); |
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csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); |
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csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1); |
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csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); |
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csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); |
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csd->write_partial = UNSTUFF_BITS(resp, 21, 1); |
|
|
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if (UNSTUFF_BITS(resp, 46, 1)) { |
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csd->erase_size = 1; |
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} else if (csd->write_blkbits >= 9) { |
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csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; |
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csd->erase_size <<= csd->write_blkbits - 9; |
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} |
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|
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if (UNSTUFF_BITS(resp, 13, 1)) |
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mmc_card_set_readonly(card); |
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break; |
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case 1: |
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/* |
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* This is a block-addressed SDHC or SDXC card. Most |
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* interesting fields are unused and have fixed |
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* values. To avoid getting tripped by buggy cards, |
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* we assume those fixed values ourselves. |
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*/ |
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mmc_card_set_blockaddr(card); |
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|
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csd->taac_ns = 0; /* Unused */ |
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csd->taac_clks = 0; /* Unused */ |
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|
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m = UNSTUFF_BITS(resp, 99, 4); |
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e = UNSTUFF_BITS(resp, 96, 3); |
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csd->max_dtr = tran_exp[e] * tran_mant[m]; |
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csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); |
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csd->c_size = UNSTUFF_BITS(resp, 48, 22); |
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|
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/* SDXC cards have a minimum C_SIZE of 0x00FFFF */ |
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if (csd->c_size >= 0xFFFF) |
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mmc_card_set_ext_capacity(card); |
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|
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m = UNSTUFF_BITS(resp, 48, 22); |
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csd->capacity = (1 + m) << 10; |
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|
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csd->read_blkbits = 9; |
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csd->read_partial = 0; |
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csd->write_misalign = 0; |
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csd->read_misalign = 0; |
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csd->r2w_factor = 4; /* Unused */ |
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csd->write_blkbits = 9; |
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csd->write_partial = 0; |
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csd->erase_size = 1; |
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|
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if (UNSTUFF_BITS(resp, 13, 1)) |
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mmc_card_set_readonly(card); |
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break; |
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default: |
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pr_err("%s: unrecognised CSD structure version %d\n", |
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mmc_hostname(card->host), csd_struct); |
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return -EINVAL; |
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} |
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|
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card->erase_size = csd->erase_size; |
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|
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return 0; |
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} |
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|
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/* |
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* Given a 64-bit response, decode to our card SCR structure. |
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*/ |
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static int mmc_decode_scr(struct mmc_card *card) |
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{ |
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struct sd_scr *scr = &card->scr; |
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unsigned int scr_struct; |
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u32 resp[4]; |
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|
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resp[3] = card->raw_scr[1]; |
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resp[2] = card->raw_scr[0]; |
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|
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scr_struct = UNSTUFF_BITS(resp, 60, 4); |
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if (scr_struct != 0) { |
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pr_err("%s: unrecognised SCR structure version %d\n", |
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mmc_hostname(card->host), scr_struct); |
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return -EINVAL; |
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} |
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|
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scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); |
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scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); |
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if (scr->sda_vsn == SCR_SPEC_VER_2) |
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/* Check if Physical Layer Spec v3.0 is supported */ |
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scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); |
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|
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if (scr->sda_spec3) { |
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scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1); |
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scr->sda_specx = UNSTUFF_BITS(resp, 38, 4); |
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} |
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|
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if (UNSTUFF_BITS(resp, 55, 1)) |
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card->erased_byte = 0xFF; |
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else |
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card->erased_byte = 0x0; |
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|
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if (scr->sda_spec3) |
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scr->cmds = UNSTUFF_BITS(resp, 32, 2); |
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|
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/* SD Spec says: any SD Card shall set at least bits 0 and 2 */ |
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if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) || |
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!(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) { |
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pr_err("%s: invalid bus width\n", mmc_hostname(card->host)); |
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return -EINVAL; |
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} |
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|
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return 0; |
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} |
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|
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/* |
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* Fetch and process SD Status register. |
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*/ |
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static int mmc_read_ssr(struct mmc_card *card) |
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{ |
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unsigned int au, es, et, eo; |
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__be32 *raw_ssr; |
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u32 resp[4] = {}; |
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u8 discard_support; |
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int i; |
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|
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if (!(card->csd.cmdclass & CCC_APP_SPEC)) { |
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pr_warn("%s: card lacks mandatory SD Status function\n", |
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mmc_hostname(card->host)); |
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return 0; |
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} |
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|
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raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL); |
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if (!raw_ssr) |
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return -ENOMEM; |
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|
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if (mmc_app_sd_status(card, raw_ssr)) { |
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pr_warn("%s: problem reading SD Status register\n", |
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mmc_hostname(card->host)); |
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kfree(raw_ssr); |
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return 0; |
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} |
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|
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for (i = 0; i < 16; i++) |
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card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]); |
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|
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kfree(raw_ssr); |
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|
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/* |
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* UNSTUFF_BITS only works with four u32s so we have to offset the |
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* bitfield positions accordingly. |
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*/ |
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au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4); |
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if (au) { |
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if (au <= 9 || card->scr.sda_spec3) { |
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card->ssr.au = sd_au_size[au]; |
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es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16); |
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et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6); |
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if (es && et) { |
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eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2); |
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card->ssr.erase_timeout = (et * 1000) / es; |
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card->ssr.erase_offset = eo * 1000; |
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} |
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} else { |
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pr_warn("%s: SD Status: Invalid Allocation Unit size\n", |
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mmc_hostname(card->host)); |
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} |
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} |
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|
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/* |
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* starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set |
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*/ |
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resp[3] = card->raw_ssr[6]; |
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discard_support = UNSTUFF_BITS(resp, 313 - 288, 1); |
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card->erase_arg = (card->scr.sda_specx && discard_support) ? |
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SD_DISCARD_ARG : SD_ERASE_ARG; |
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|
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return 0; |
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} |
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|
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/* |
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* Fetches and decodes switch information |
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*/ |
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static int mmc_read_switch(struct mmc_card *card) |
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{ |
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int err; |
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u8 *status; |
|
|
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if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
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return 0; |
|
|
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if (!(card->csd.cmdclass & CCC_SWITCH)) { |
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pr_warn("%s: card lacks mandatory switch function, performance might suffer\n", |
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mmc_hostname(card->host)); |
|
return 0; |
|
} |
|
|
|
status = kmalloc(64, GFP_KERNEL); |
|
if (!status) |
|
return -ENOMEM; |
|
|
|
/* |
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* Find out the card's support bits with a mode 0 operation. |
|
* The argument does not matter, as the support bits do not |
|
* change with the arguments. |
|
*/ |
|
err = mmc_sd_switch(card, 0, 0, 0, status); |
|
if (err) { |
|
/* |
|
* If the host or the card can't do the switch, |
|
* fail more gracefully. |
|
*/ |
|
if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) |
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goto out; |
|
|
|
pr_warn("%s: problem reading Bus Speed modes\n", |
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mmc_hostname(card->host)); |
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err = 0; |
|
|
|
goto out; |
|
} |
|
|
|
if (status[13] & SD_MODE_HIGH_SPEED) |
|
card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; |
|
|
|
if (card->scr.sda_spec3) { |
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card->sw_caps.sd3_bus_mode = status[13]; |
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/* Driver Strengths supported by the card */ |
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card->sw_caps.sd3_drv_type = status[9]; |
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card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8; |
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} |
|
|
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out: |
|
kfree(status); |
|
|
|
return err; |
|
} |
|
|
|
/* |
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* Test if the card supports high-speed mode and, if so, switch to it. |
|
*/ |
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int mmc_sd_switch_hs(struct mmc_card *card) |
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{ |
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int err; |
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u8 *status; |
|
|
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if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
|
return 0; |
|
|
|
if (!(card->csd.cmdclass & CCC_SWITCH)) |
|
return 0; |
|
|
|
if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) |
|
return 0; |
|
|
|
if (card->sw_caps.hs_max_dtr == 0) |
|
return 0; |
|
|
|
status = kmalloc(64, GFP_KERNEL); |
|
if (!status) |
|
return -ENOMEM; |
|
|
|
err = mmc_sd_switch(card, 1, 0, HIGH_SPEED_BUS_SPEED, status); |
|
if (err) |
|
goto out; |
|
|
|
if ((status[16] & 0xF) != HIGH_SPEED_BUS_SPEED) { |
|
pr_warn("%s: Problem switching card into high-speed mode!\n", |
|
mmc_hostname(card->host)); |
|
err = 0; |
|
} else { |
|
err = 1; |
|
} |
|
|
|
out: |
|
kfree(status); |
|
|
|
return err; |
|
} |
|
|
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static int sd_select_driver_type(struct mmc_card *card, u8 *status) |
|
{ |
|
int card_drv_type, drive_strength, drv_type; |
|
int err; |
|
|
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card->drive_strength = 0; |
|
|
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card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; |
|
|
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drive_strength = mmc_select_drive_strength(card, |
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card->sw_caps.uhs_max_dtr, |
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card_drv_type, &drv_type); |
|
|
|
if (drive_strength) { |
|
err = mmc_sd_switch(card, 1, 2, drive_strength, status); |
|
if (err) |
|
return err; |
|
if ((status[15] & 0xF) != drive_strength) { |
|
pr_warn("%s: Problem setting drive strength!\n", |
|
mmc_hostname(card->host)); |
|
return 0; |
|
} |
|
card->drive_strength = drive_strength; |
|
} |
|
|
|
if (drv_type) |
|
mmc_set_driver_type(card->host, drv_type); |
|
|
|
return 0; |
|
} |
|
|
|
static void sd_update_bus_speed_mode(struct mmc_card *card) |
|
{ |
|
/* |
|
* If the host doesn't support any of the UHS-I modes, fallback on |
|
* default speed. |
|
*/ |
|
if (!mmc_host_uhs(card->host)) { |
|
card->sd_bus_speed = 0; |
|
return; |
|
} |
|
|
|
if ((card->host->caps & MMC_CAP_UHS_SDR104) && |
|
(card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { |
|
card->sd_bus_speed = UHS_SDR104_BUS_SPEED; |
|
} else if ((card->host->caps & MMC_CAP_UHS_DDR50) && |
|
(card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { |
|
card->sd_bus_speed = UHS_DDR50_BUS_SPEED; |
|
} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | |
|
MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & |
|
SD_MODE_UHS_SDR50)) { |
|
card->sd_bus_speed = UHS_SDR50_BUS_SPEED; |
|
} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | |
|
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && |
|
(card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { |
|
card->sd_bus_speed = UHS_SDR25_BUS_SPEED; |
|
} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | |
|
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | |
|
MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & |
|
SD_MODE_UHS_SDR12)) { |
|
card->sd_bus_speed = UHS_SDR12_BUS_SPEED; |
|
} |
|
} |
|
|
|
static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) |
|
{ |
|
int err; |
|
unsigned int timing = 0; |
|
|
|
switch (card->sd_bus_speed) { |
|
case UHS_SDR104_BUS_SPEED: |
|
timing = MMC_TIMING_UHS_SDR104; |
|
card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; |
|
break; |
|
case UHS_DDR50_BUS_SPEED: |
|
timing = MMC_TIMING_UHS_DDR50; |
|
card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; |
|
break; |
|
case UHS_SDR50_BUS_SPEED: |
|
timing = MMC_TIMING_UHS_SDR50; |
|
card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; |
|
break; |
|
case UHS_SDR25_BUS_SPEED: |
|
timing = MMC_TIMING_UHS_SDR25; |
|
card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; |
|
break; |
|
case UHS_SDR12_BUS_SPEED: |
|
timing = MMC_TIMING_UHS_SDR12; |
|
card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; |
|
break; |
|
default: |
|
return 0; |
|
} |
|
|
|
err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); |
|
if (err) |
|
return err; |
|
|
|
if ((status[16] & 0xF) != card->sd_bus_speed) |
|
pr_warn("%s: Problem setting bus speed mode!\n", |
|
mmc_hostname(card->host)); |
|
else { |
|
mmc_set_timing(card->host, timing); |
|
mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* Get host's max current setting at its current voltage */ |
|
static u32 sd_get_host_max_current(struct mmc_host *host) |
|
{ |
|
u32 voltage, max_current; |
|
|
|
voltage = 1 << host->ios.vdd; |
|
switch (voltage) { |
|
case MMC_VDD_165_195: |
|
max_current = host->max_current_180; |
|
break; |
|
case MMC_VDD_29_30: |
|
case MMC_VDD_30_31: |
|
max_current = host->max_current_300; |
|
break; |
|
case MMC_VDD_32_33: |
|
case MMC_VDD_33_34: |
|
max_current = host->max_current_330; |
|
break; |
|
default: |
|
max_current = 0; |
|
} |
|
|
|
return max_current; |
|
} |
|
|
|
static int sd_set_current_limit(struct mmc_card *card, u8 *status) |
|
{ |
|
int current_limit = SD_SET_CURRENT_NO_CHANGE; |
|
int err; |
|
u32 max_current; |
|
|
|
/* |
|
* Current limit switch is only defined for SDR50, SDR104, and DDR50 |
|
* bus speed modes. For other bus speed modes, we do not change the |
|
* current limit. |
|
*/ |
|
if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && |
|
(card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && |
|
(card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) |
|
return 0; |
|
|
|
/* |
|
* Host has different current capabilities when operating at |
|
* different voltages, so find out its max current first. |
|
*/ |
|
max_current = sd_get_host_max_current(card->host); |
|
|
|
/* |
|
* We only check host's capability here, if we set a limit that is |
|
* higher than the card's maximum current, the card will be using its |
|
* maximum current, e.g. if the card's maximum current is 300ma, and |
|
* when we set current limit to 200ma, the card will draw 200ma, and |
|
* when we set current limit to 400/600/800ma, the card will draw its |
|
* maximum 300ma from the host. |
|
* |
|
* The above is incorrect: if we try to set a current limit that is |
|
* not supported by the card, the card can rightfully error out the |
|
* attempt, and remain at the default current limit. This results |
|
* in a 300mA card being limited to 200mA even though the host |
|
* supports 800mA. Failures seen with SanDisk 8GB UHS cards with |
|
* an iMX6 host. --rmk |
|
*/ |
|
if (max_current >= 800 && |
|
card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) |
|
current_limit = SD_SET_CURRENT_LIMIT_800; |
|
else if (max_current >= 600 && |
|
card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) |
|
current_limit = SD_SET_CURRENT_LIMIT_600; |
|
else if (max_current >= 400 && |
|
card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) |
|
current_limit = SD_SET_CURRENT_LIMIT_400; |
|
else if (max_current >= 200 && |
|
card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) |
|
current_limit = SD_SET_CURRENT_LIMIT_200; |
|
|
|
if (current_limit != SD_SET_CURRENT_NO_CHANGE) { |
|
err = mmc_sd_switch(card, 1, 3, current_limit, status); |
|
if (err) |
|
return err; |
|
|
|
if (((status[15] >> 4) & 0x0F) != current_limit) |
|
pr_warn("%s: Problem setting current limit!\n", |
|
mmc_hostname(card->host)); |
|
|
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* UHS-I specific initialization procedure |
|
*/ |
|
static int mmc_sd_init_uhs_card(struct mmc_card *card) |
|
{ |
|
int err; |
|
u8 *status; |
|
|
|
if (!(card->csd.cmdclass & CCC_SWITCH)) |
|
return 0; |
|
|
|
status = kmalloc(64, GFP_KERNEL); |
|
if (!status) |
|
return -ENOMEM; |
|
|
|
/* Set 4-bit bus width */ |
|
err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); |
|
if (err) |
|
goto out; |
|
|
|
mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); |
|
|
|
/* |
|
* Select the bus speed mode depending on host |
|
* and card capability. |
|
*/ |
|
sd_update_bus_speed_mode(card); |
|
|
|
/* Set the driver strength for the card */ |
|
err = sd_select_driver_type(card, status); |
|
if (err) |
|
goto out; |
|
|
|
/* Set current limit for the card */ |
|
err = sd_set_current_limit(card, status); |
|
if (err) |
|
goto out; |
|
|
|
/* Set bus speed mode of the card */ |
|
err = sd_set_bus_speed_mode(card, status); |
|
if (err) |
|
goto out; |
|
|
|
/* |
|
* SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and |
|
* SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. |
|
*/ |
|
if (!mmc_host_is_spi(card->host) && |
|
(card->host->ios.timing == MMC_TIMING_UHS_SDR50 || |
|
card->host->ios.timing == MMC_TIMING_UHS_DDR50 || |
|
card->host->ios.timing == MMC_TIMING_UHS_SDR104)) { |
|
err = mmc_execute_tuning(card); |
|
|
|
/* |
|
* As SD Specifications Part1 Physical Layer Specification |
|
* Version 3.01 says, CMD19 tuning is available for unlocked |
|
* cards in transfer state of 1.8V signaling mode. The small |
|
* difference between v3.00 and 3.01 spec means that CMD19 |
|
* tuning is also available for DDR50 mode. |
|
*/ |
|
if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { |
|
pr_warn("%s: ddr50 tuning failed\n", |
|
mmc_hostname(card->host)); |
|
err = 0; |
|
} |
|
} |
|
|
|
out: |
|
kfree(status); |
|
|
|
return err; |
|
} |
|
|
|
MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], |
|
card->raw_cid[2], card->raw_cid[3]); |
|
MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], |
|
card->raw_csd[2], card->raw_csd[3]); |
|
MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); |
|
MMC_DEV_ATTR(ssr, |
|
"%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n", |
|
card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2], |
|
card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5], |
|
card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8], |
|
card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11], |
|
card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14], |
|
card->raw_ssr[15]); |
|
MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); |
|
MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); |
|
MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); |
|
MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); |
|
MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); |
|
MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); |
|
MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); |
|
MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); |
|
MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); |
|
MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr); |
|
MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); |
|
|
|
|
|
static ssize_t mmc_dsr_show(struct device *dev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct mmc_card *card = mmc_dev_to_card(dev); |
|
struct mmc_host *host = card->host; |
|
|
|
if (card->csd.dsr_imp && host->dsr_req) |
|
return sprintf(buf, "0x%x\n", host->dsr); |
|
else |
|
/* return default DSR value */ |
|
return sprintf(buf, "0x%x\n", 0x404); |
|
} |
|
|
|
static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL); |
|
|
|
MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor); |
|
MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device); |
|
MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev); |
|
|
|
#define sdio_info_attr(num) \ |
|
static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \ |
|
{ \ |
|
struct mmc_card *card = mmc_dev_to_card(dev); \ |
|
\ |
|
if (num > card->num_info) \ |
|
return -ENODATA; \ |
|
if (!card->info[num-1][0]) \ |
|
return 0; \ |
|
return sprintf(buf, "%s\n", card->info[num-1]); \ |
|
} \ |
|
static DEVICE_ATTR_RO(info##num) |
|
|
|
sdio_info_attr(1); |
|
sdio_info_attr(2); |
|
sdio_info_attr(3); |
|
sdio_info_attr(4); |
|
|
|
static struct attribute *sd_std_attrs[] = { |
|
&dev_attr_vendor.attr, |
|
&dev_attr_device.attr, |
|
&dev_attr_revision.attr, |
|
&dev_attr_info1.attr, |
|
&dev_attr_info2.attr, |
|
&dev_attr_info3.attr, |
|
&dev_attr_info4.attr, |
|
&dev_attr_cid.attr, |
|
&dev_attr_csd.attr, |
|
&dev_attr_scr.attr, |
|
&dev_attr_ssr.attr, |
|
&dev_attr_date.attr, |
|
&dev_attr_erase_size.attr, |
|
&dev_attr_preferred_erase_size.attr, |
|
&dev_attr_fwrev.attr, |
|
&dev_attr_hwrev.attr, |
|
&dev_attr_manfid.attr, |
|
&dev_attr_name.attr, |
|
&dev_attr_oemid.attr, |
|
&dev_attr_serial.attr, |
|
&dev_attr_ocr.attr, |
|
&dev_attr_rca.attr, |
|
&dev_attr_dsr.attr, |
|
NULL, |
|
}; |
|
|
|
static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr, |
|
int index) |
|
{ |
|
struct device *dev = kobj_to_dev(kobj); |
|
struct mmc_card *card = mmc_dev_to_card(dev); |
|
|
|
/* CIS vendor and device ids, revision and info string are available only for Combo cards */ |
|
if ((attr == &dev_attr_vendor.attr || |
|
attr == &dev_attr_device.attr || |
|
attr == &dev_attr_revision.attr || |
|
attr == &dev_attr_info1.attr || |
|
attr == &dev_attr_info2.attr || |
|
attr == &dev_attr_info3.attr || |
|
attr == &dev_attr_info4.attr |
|
) && card->type != MMC_TYPE_SD_COMBO) |
|
return 0; |
|
|
|
return attr->mode; |
|
} |
|
|
|
static const struct attribute_group sd_std_group = { |
|
.attrs = sd_std_attrs, |
|
.is_visible = sd_std_is_visible, |
|
}; |
|
__ATTRIBUTE_GROUPS(sd_std); |
|
|
|
struct device_type sd_type = { |
|
.groups = sd_std_groups, |
|
}; |
|
|
|
/* |
|
* Fetch CID from card. |
|
*/ |
|
int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) |
|
{ |
|
int err; |
|
u32 max_current; |
|
int retries = 10; |
|
u32 pocr = ocr; |
|
|
|
try_again: |
|
if (!retries) { |
|
ocr &= ~SD_OCR_S18R; |
|
pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); |
|
} |
|
|
|
/* |
|
* Since we're changing the OCR value, we seem to |
|
* need to tell some cards to go back to the idle |
|
* state. We wait 1ms to give cards time to |
|
* respond. |
|
*/ |
|
mmc_go_idle(host); |
|
|
|
/* |
|
* If SD_SEND_IF_COND indicates an SD 2.0 |
|
* compliant card and we should set bit 30 |
|
* of the ocr to indicate that we can handle |
|
* block-addressed SDHC cards. |
|
*/ |
|
err = mmc_send_if_cond(host, ocr); |
|
if (!err) |
|
ocr |= SD_OCR_CCS; |
|
|
|
/* |
|
* If the host supports one of UHS-I modes, request the card |
|
* to switch to 1.8V signaling level. If the card has failed |
|
* repeatedly to switch however, skip this. |
|
*/ |
|
if (retries && mmc_host_uhs(host)) |
|
ocr |= SD_OCR_S18R; |
|
|
|
/* |
|
* If the host can supply more than 150mA at current voltage, |
|
* XPC should be set to 1. |
|
*/ |
|
max_current = sd_get_host_max_current(host); |
|
if (max_current > 150) |
|
ocr |= SD_OCR_XPC; |
|
|
|
err = mmc_send_app_op_cond(host, ocr, rocr); |
|
if (err) |
|
return err; |
|
|
|
/* |
|
* In case CCS and S18A in the response is set, start Signal Voltage |
|
* Switch procedure. SPI mode doesn't support CMD11. |
|
*/ |
|
if (!mmc_host_is_spi(host) && rocr && |
|
((*rocr & 0x41000000) == 0x41000000)) { |
|
err = mmc_set_uhs_voltage(host, pocr); |
|
if (err == -EAGAIN) { |
|
retries--; |
|
goto try_again; |
|
} else if (err) { |
|
retries = 0; |
|
goto try_again; |
|
} |
|
} |
|
|
|
err = mmc_send_cid(host, cid); |
|
return err; |
|
} |
|
|
|
int mmc_sd_get_csd(struct mmc_card *card) |
|
{ |
|
int err; |
|
|
|
/* |
|
* Fetch CSD from card. |
|
*/ |
|
err = mmc_send_csd(card, card->raw_csd); |
|
if (err) |
|
return err; |
|
|
|
err = mmc_decode_csd(card); |
|
if (err) |
|
return err; |
|
|
|
return 0; |
|
} |
|
|
|
static int mmc_sd_get_ro(struct mmc_host *host) |
|
{ |
|
int ro; |
|
|
|
/* |
|
* Some systems don't feature a write-protect pin and don't need one. |
|
* E.g. because they only have micro-SD card slot. For those systems |
|
* assume that the SD card is always read-write. |
|
*/ |
|
if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT) |
|
return 0; |
|
|
|
if (!host->ops->get_ro) |
|
return -1; |
|
|
|
ro = host->ops->get_ro(host); |
|
|
|
return ro; |
|
} |
|
|
|
int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, |
|
bool reinit) |
|
{ |
|
int err; |
|
|
|
if (!reinit) { |
|
/* |
|
* Fetch SCR from card. |
|
*/ |
|
err = mmc_app_send_scr(card); |
|
if (err) |
|
return err; |
|
|
|
err = mmc_decode_scr(card); |
|
if (err) |
|
return err; |
|
|
|
/* |
|
* Fetch and process SD Status register. |
|
*/ |
|
err = mmc_read_ssr(card); |
|
if (err) |
|
return err; |
|
|
|
/* Erase init depends on CSD and SSR */ |
|
mmc_init_erase(card); |
|
|
|
/* |
|
* Fetch switch information from card. |
|
*/ |
|
err = mmc_read_switch(card); |
|
if (err) |
|
return err; |
|
} |
|
|
|
/* |
|
* For SPI, enable CRC as appropriate. |
|
* This CRC enable is located AFTER the reading of the |
|
* card registers because some SDHC cards are not able |
|
* to provide valid CRCs for non-512-byte blocks. |
|
*/ |
|
if (mmc_host_is_spi(host)) { |
|
err = mmc_spi_set_crc(host, use_spi_crc); |
|
if (err) |
|
return err; |
|
} |
|
|
|
/* |
|
* Check if read-only switch is active. |
|
*/ |
|
if (!reinit) { |
|
int ro = mmc_sd_get_ro(host); |
|
|
|
if (ro < 0) { |
|
pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", |
|
mmc_hostname(host)); |
|
} else if (ro > 0) { |
|
mmc_card_set_readonly(card); |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
unsigned mmc_sd_get_max_clock(struct mmc_card *card) |
|
{ |
|
unsigned max_dtr = (unsigned int)-1; |
|
|
|
if (mmc_card_hs(card)) { |
|
if (max_dtr > card->sw_caps.hs_max_dtr) |
|
max_dtr = card->sw_caps.hs_max_dtr; |
|
} else if (max_dtr > card->csd.max_dtr) { |
|
max_dtr = card->csd.max_dtr; |
|
} |
|
|
|
return max_dtr; |
|
} |
|
|
|
static bool mmc_sd_card_using_v18(struct mmc_card *card) |
|
{ |
|
/* |
|
* According to the SD spec., the Bus Speed Mode (function group 1) bits |
|
* 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus |
|
* they can be used to determine if the card has already switched to |
|
* 1.8V signaling. |
|
*/ |
|
return card->sw_caps.sd3_bus_mode & |
|
(SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); |
|
} |
|
|
|
/* |
|
* Handle the detection and initialisation of a card. |
|
* |
|
* In the case of a resume, "oldcard" will contain the card |
|
* we're trying to reinitialise. |
|
*/ |
|
static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, |
|
struct mmc_card *oldcard) |
|
{ |
|
struct mmc_card *card; |
|
int err; |
|
u32 cid[4]; |
|
u32 rocr = 0; |
|
bool v18_fixup_failed = false; |
|
|
|
WARN_ON(!host->claimed); |
|
retry: |
|
err = mmc_sd_get_cid(host, ocr, cid, &rocr); |
|
if (err) |
|
return err; |
|
|
|
if (oldcard) { |
|
if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { |
|
pr_debug("%s: Perhaps the card was replaced\n", |
|
mmc_hostname(host)); |
|
return -ENOENT; |
|
} |
|
|
|
card = oldcard; |
|
} else { |
|
/* |
|
* Allocate card structure. |
|
*/ |
|
card = mmc_alloc_card(host, &sd_type); |
|
if (IS_ERR(card)) |
|
return PTR_ERR(card); |
|
|
|
card->ocr = ocr; |
|
card->type = MMC_TYPE_SD; |
|
memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); |
|
} |
|
|
|
/* |
|
* Call the optional HC's init_card function to handle quirks. |
|
*/ |
|
if (host->ops->init_card) |
|
host->ops->init_card(host, card); |
|
|
|
/* |
|
* For native busses: get card RCA and quit open drain mode. |
|
*/ |
|
if (!mmc_host_is_spi(host)) { |
|
err = mmc_send_relative_addr(host, &card->rca); |
|
if (err) |
|
goto free_card; |
|
} |
|
|
|
if (!oldcard) { |
|
err = mmc_sd_get_csd(card); |
|
if (err) |
|
goto free_card; |
|
|
|
mmc_decode_cid(card); |
|
} |
|
|
|
/* |
|
* handling only for cards supporting DSR and hosts requesting |
|
* DSR configuration |
|
*/ |
|
if (card->csd.dsr_imp && host->dsr_req) |
|
mmc_set_dsr(host); |
|
|
|
/* |
|
* Select card, as all following commands rely on that. |
|
*/ |
|
if (!mmc_host_is_spi(host)) { |
|
err = mmc_select_card(card); |
|
if (err) |
|
goto free_card; |
|
} |
|
|
|
err = mmc_sd_setup_card(host, card, oldcard != NULL); |
|
if (err) |
|
goto free_card; |
|
|
|
/* |
|
* If the card has not been power cycled, it may still be using 1.8V |
|
* signaling. Detect that situation and try to initialize a UHS-I (1.8V) |
|
* transfer mode. |
|
*/ |
|
if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) && |
|
mmc_sd_card_using_v18(card) && |
|
host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { |
|
/* |
|
* Re-read switch information in case it has changed since |
|
* oldcard was initialized. |
|
*/ |
|
if (oldcard) { |
|
err = mmc_read_switch(card); |
|
if (err) |
|
goto free_card; |
|
} |
|
if (mmc_sd_card_using_v18(card)) { |
|
if (mmc_host_set_uhs_voltage(host) || |
|
mmc_sd_init_uhs_card(card)) { |
|
v18_fixup_failed = true; |
|
mmc_power_cycle(host, ocr); |
|
if (!oldcard) |
|
mmc_remove_card(card); |
|
goto retry; |
|
} |
|
goto done; |
|
} |
|
} |
|
|
|
/* Initialization sequence for UHS-I cards */ |
|
if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { |
|
err = mmc_sd_init_uhs_card(card); |
|
if (err) |
|
goto free_card; |
|
} else { |
|
/* |
|
* Attempt to change to high-speed (if supported) |
|
*/ |
|
err = mmc_sd_switch_hs(card); |
|
if (err > 0) |
|
mmc_set_timing(card->host, MMC_TIMING_SD_HS); |
|
else if (err) |
|
goto free_card; |
|
|
|
/* |
|
* Set bus speed. |
|
*/ |
|
mmc_set_clock(host, mmc_sd_get_max_clock(card)); |
|
|
|
/* |
|
* Switch to wider bus (if supported). |
|
*/ |
|
if ((host->caps & MMC_CAP_4_BIT_DATA) && |
|
(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { |
|
err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); |
|
if (err) |
|
goto free_card; |
|
|
|
mmc_set_bus_width(host, MMC_BUS_WIDTH_4); |
|
} |
|
} |
|
|
|
if (host->cqe_ops && !host->cqe_enabled) { |
|
err = host->cqe_ops->cqe_enable(host, card); |
|
if (!err) { |
|
host->cqe_enabled = true; |
|
host->hsq_enabled = true; |
|
pr_info("%s: Host Software Queue enabled\n", |
|
mmc_hostname(host)); |
|
} |
|
} |
|
|
|
if (host->caps2 & MMC_CAP2_AVOID_3_3V && |
|
host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { |
|
pr_err("%s: Host failed to negotiate down from 3.3V\n", |
|
mmc_hostname(host)); |
|
err = -EINVAL; |
|
goto free_card; |
|
} |
|
done: |
|
host->card = card; |
|
return 0; |
|
|
|
free_card: |
|
if (!oldcard) |
|
mmc_remove_card(card); |
|
|
|
return err; |
|
} |
|
|
|
/* |
|
* Host is being removed. Free up the current card. |
|
*/ |
|
static void mmc_sd_remove(struct mmc_host *host) |
|
{ |
|
mmc_remove_card(host->card); |
|
host->card = NULL; |
|
} |
|
|
|
/* |
|
* Card detection - card is alive. |
|
*/ |
|
static int mmc_sd_alive(struct mmc_host *host) |
|
{ |
|
return mmc_send_status(host->card, NULL); |
|
} |
|
|
|
/* |
|
* Card detection callback from host. |
|
*/ |
|
static void mmc_sd_detect(struct mmc_host *host) |
|
{ |
|
int err; |
|
|
|
mmc_get_card(host->card, NULL); |
|
|
|
/* |
|
* Just check if our card has been removed. |
|
*/ |
|
err = _mmc_detect_card_removed(host); |
|
|
|
mmc_put_card(host->card, NULL); |
|
|
|
if (err) { |
|
mmc_sd_remove(host); |
|
|
|
mmc_claim_host(host); |
|
mmc_detach_bus(host); |
|
mmc_power_off(host); |
|
mmc_release_host(host); |
|
} |
|
} |
|
|
|
static int _mmc_sd_suspend(struct mmc_host *host) |
|
{ |
|
int err = 0; |
|
|
|
mmc_claim_host(host); |
|
|
|
if (mmc_card_suspended(host->card)) |
|
goto out; |
|
|
|
if (!mmc_host_is_spi(host)) |
|
err = mmc_deselect_cards(host); |
|
|
|
if (!err) { |
|
mmc_power_off(host); |
|
mmc_card_set_suspended(host->card); |
|
} |
|
|
|
out: |
|
mmc_release_host(host); |
|
return err; |
|
} |
|
|
|
/* |
|
* Callback for suspend |
|
*/ |
|
static int mmc_sd_suspend(struct mmc_host *host) |
|
{ |
|
int err; |
|
|
|
err = _mmc_sd_suspend(host); |
|
if (!err) { |
|
pm_runtime_disable(&host->card->dev); |
|
pm_runtime_set_suspended(&host->card->dev); |
|
} |
|
|
|
return err; |
|
} |
|
|
|
/* |
|
* This function tries to determine if the same card is still present |
|
* and, if so, restore all state to it. |
|
*/ |
|
static int _mmc_sd_resume(struct mmc_host *host) |
|
{ |
|
int err = 0; |
|
|
|
mmc_claim_host(host); |
|
|
|
if (!mmc_card_suspended(host->card)) |
|
goto out; |
|
|
|
mmc_power_up(host, host->card->ocr); |
|
err = mmc_sd_init_card(host, host->card->ocr, host->card); |
|
mmc_card_clr_suspended(host->card); |
|
|
|
out: |
|
mmc_release_host(host); |
|
return err; |
|
} |
|
|
|
/* |
|
* Callback for resume |
|
*/ |
|
static int mmc_sd_resume(struct mmc_host *host) |
|
{ |
|
pm_runtime_enable(&host->card->dev); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Callback for runtime_suspend. |
|
*/ |
|
static int mmc_sd_runtime_suspend(struct mmc_host *host) |
|
{ |
|
int err; |
|
|
|
if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) |
|
return 0; |
|
|
|
err = _mmc_sd_suspend(host); |
|
if (err) |
|
pr_err("%s: error %d doing aggressive suspend\n", |
|
mmc_hostname(host), err); |
|
|
|
return err; |
|
} |
|
|
|
/* |
|
* Callback for runtime_resume. |
|
*/ |
|
static int mmc_sd_runtime_resume(struct mmc_host *host) |
|
{ |
|
int err; |
|
|
|
err = _mmc_sd_resume(host); |
|
if (err && err != -ENOMEDIUM) |
|
pr_err("%s: error %d doing runtime resume\n", |
|
mmc_hostname(host), err); |
|
|
|
return 0; |
|
} |
|
|
|
static int mmc_sd_hw_reset(struct mmc_host *host) |
|
{ |
|
mmc_power_cycle(host, host->card->ocr); |
|
return mmc_sd_init_card(host, host->card->ocr, host->card); |
|
} |
|
|
|
static const struct mmc_bus_ops mmc_sd_ops = { |
|
.remove = mmc_sd_remove, |
|
.detect = mmc_sd_detect, |
|
.runtime_suspend = mmc_sd_runtime_suspend, |
|
.runtime_resume = mmc_sd_runtime_resume, |
|
.suspend = mmc_sd_suspend, |
|
.resume = mmc_sd_resume, |
|
.alive = mmc_sd_alive, |
|
.shutdown = mmc_sd_suspend, |
|
.hw_reset = mmc_sd_hw_reset, |
|
}; |
|
|
|
/* |
|
* Starting point for SD card init. |
|
*/ |
|
int mmc_attach_sd(struct mmc_host *host) |
|
{ |
|
int err; |
|
u32 ocr, rocr; |
|
|
|
WARN_ON(!host->claimed); |
|
|
|
err = mmc_send_app_op_cond(host, 0, &ocr); |
|
if (err) |
|
return err; |
|
|
|
mmc_attach_bus(host, &mmc_sd_ops); |
|
if (host->ocr_avail_sd) |
|
host->ocr_avail = host->ocr_avail_sd; |
|
|
|
/* |
|
* We need to get OCR a different way for SPI. |
|
*/ |
|
if (mmc_host_is_spi(host)) { |
|
mmc_go_idle(host); |
|
|
|
err = mmc_spi_read_ocr(host, 0, &ocr); |
|
if (err) |
|
goto err; |
|
} |
|
|
|
/* |
|
* Some SD cards claims an out of spec VDD voltage range. Let's treat |
|
* these bits as being in-valid and especially also bit7. |
|
*/ |
|
ocr &= ~0x7FFF; |
|
|
|
rocr = mmc_select_voltage(host, ocr); |
|
|
|
/* |
|
* Can we support the voltage(s) of the card(s)? |
|
*/ |
|
if (!rocr) { |
|
err = -EINVAL; |
|
goto err; |
|
} |
|
|
|
/* |
|
* Detect and init the card. |
|
*/ |
|
err = mmc_sd_init_card(host, rocr, NULL); |
|
if (err) |
|
goto err; |
|
|
|
mmc_release_host(host); |
|
err = mmc_add_card(host->card); |
|
if (err) |
|
goto remove_card; |
|
|
|
mmc_claim_host(host); |
|
return 0; |
|
|
|
remove_card: |
|
mmc_remove_card(host->card); |
|
host->card = NULL; |
|
mmc_claim_host(host); |
|
err: |
|
mmc_detach_bus(host); |
|
|
|
pr_err("%s: error %d whilst initialising SD card\n", |
|
mmc_hostname(host), err); |
|
|
|
return err; |
|
}
|
|
|