862 lines
18 KiB
C
862 lines
18 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/err.h>
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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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#include <linux/kthread.h>
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#include "core.h"
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#include "bus.h"
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#include "mmc_ops.h"
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#include "sd_ops.h"
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extern void mmc_power_up(struct mmc_host *host);
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extern void mmc_power_off(struct mmc_host *host);
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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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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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static const unsigned int tacc_exp[] = {
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1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
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};
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static const unsigned int tacc_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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#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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* Given the decoded CSD structure, decode the raw CID to our CID structure.
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*/
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static 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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memset(&card->cid, 0, sizeof(struct mmc_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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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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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->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
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csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
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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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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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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->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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break;
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case 1:
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/*
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* This is a block-addressed SDHC 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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csd->tacc_ns = 0; /* Unused */
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csd->tacc_clks = 0; /* Unused */
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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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m = UNSTUFF_BITS(resp, 48, 22);
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csd->capacity = (1 + m) << 10;
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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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break;
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default:
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printk(KERN_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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return 0;
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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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resp[3] = card->raw_scr[1];
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resp[2] = card->raw_scr[0];
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scr_struct = UNSTUFF_BITS(resp, 60, 4);
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if (scr_struct != 0) {
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printk(KERN_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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scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
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scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
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return 0;
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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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printk(KERN_WARNING "%s: card lacks mandatory switch "
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"function, performance might suffer.\n",
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mmc_hostname(card->host));
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return 0;
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}
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err = -EIO;
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status = kmalloc(64, GFP_KERNEL);
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if (!status) {
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printk(KERN_ERR "%s: could not allocate a buffer for "
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"switch capabilities.\n", mmc_hostname(card->host));
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return -ENOMEM;
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}
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err = mmc_sd_switch(card, 0, 0, 1, status);
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if (err) {
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/* If the host or the card can't do the switch,
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* fail more gracefully. */
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if ((err != -EINVAL)
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&& (err != -ENOSYS)
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&& (err != -EFAULT))
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goto out;
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printk(KERN_WARNING "%s: problem reading switch "
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"capabilities, performance might suffer.\n",
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mmc_hostname(card->host));
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err = 0;
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goto out;
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}
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if (status[13] & 0x02)
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card->sw_caps.hs_max_dtr = 50000000;
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out:
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kfree(status);
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return err;
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}
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/*
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* Test if the card supports high-speed mode and, if so, switch to it.
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*/
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static int mmc_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)
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return 0;
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if (!(card->csd.cmdclass & CCC_SWITCH))
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return 0;
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if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
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return 0;
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if (card->sw_caps.hs_max_dtr == 0)
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return 0;
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err = -EIO;
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status = kmalloc(64, GFP_KERNEL);
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if (!status) {
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printk(KERN_ERR "%s: could not allocate a buffer for "
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"switch capabilities.\n", mmc_hostname(card->host));
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return -ENOMEM;
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}
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err = mmc_sd_switch(card, 1, 0, 1, status);
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if (err)
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goto out;
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if ((status[16] & 0xF) != 1) {
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printk(KERN_WARNING "%s: Problem switching card "
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"into high-speed mode!\n",
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mmc_hostname(card->host));
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} else {
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mmc_card_set_highspeed(card);
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mmc_set_timing(card->host, MMC_TIMING_SD_HS);
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}
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out:
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kfree(status);
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return err;
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}
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MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
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card->raw_cid[2], card->raw_cid[3]);
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MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
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card->raw_csd[2], card->raw_csd[3]);
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MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
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MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
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MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
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MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
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MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
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MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
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MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
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MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
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static struct attribute *sd_std_attrs[] = {
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&dev_attr_cid.attr,
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&dev_attr_csd.attr,
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&dev_attr_scr.attr,
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&dev_attr_date.attr,
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&dev_attr_fwrev.attr,
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&dev_attr_hwrev.attr,
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&dev_attr_manfid.attr,
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&dev_attr_name.attr,
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&dev_attr_oemid.attr,
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&dev_attr_serial.attr,
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NULL,
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};
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static struct attribute_group sd_std_attr_group = {
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.attrs = sd_std_attrs,
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};
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static const struct attribute_group *sd_attr_groups[] = {
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&sd_std_attr_group,
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NULL,
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};
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static struct device_type sd_type = {
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.groups = sd_attr_groups,
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};
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/*
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* Handle the detection and initialisation of a card.
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*
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* In the case of a resume, "oldcard" will contain the card
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* we're trying to reinitialise.
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*/
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static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
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struct mmc_card *oldcard)
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{
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struct mmc_card *card;
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int err;
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u32 cid[4];
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unsigned int max_dtr;
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#ifdef CONFIG_MMC_PARANOID_SD_INIT
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int retries;
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#endif
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BUG_ON(!host);
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WARN_ON(!host->claimed);
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/*
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* Since we're changing the OCR value, we seem to
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* need to tell some cards to go back to the idle
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* state. We wait 1ms to give cards time to
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* respond.
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*/
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mmc_go_idle(host);
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/*
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* If SD_SEND_IF_COND indicates an SD 2.0
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* compliant card and we should set bit 30
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* of the ocr to indicate that we can handle
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* block-addressed SDHC cards.
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*/
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err = mmc_send_if_cond(host, ocr);
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if (!err)
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ocr |= 1 << 30;
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err = mmc_send_app_op_cond(host, ocr, NULL);
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if (err)
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goto err;
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/*
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* Fetch CID from card.
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*/
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if (mmc_host_is_spi(host))
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err = mmc_send_cid(host, cid);
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else
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err = mmc_all_send_cid(host, cid);
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if (err)
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goto err;
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if (oldcard) {
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if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
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err = -ENOENT;
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goto err;
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}
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card = oldcard;
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} else {
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/*
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* Allocate card structure.
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*/
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card = mmc_alloc_card(host, &sd_type);
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if (IS_ERR(card)) {
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err = PTR_ERR(card);
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goto err;
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}
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card->type = MMC_TYPE_SD;
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memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
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}
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/*
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* For native busses: get card RCA and quit open drain mode.
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*/
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if (!mmc_host_is_spi(host)) {
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err = mmc_send_relative_addr(host, &card->rca);
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if (err)
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goto free_card;
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mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
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}
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if (!oldcard) {
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/*
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* Fetch CSD from card.
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*/
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err = mmc_send_csd(card, card->raw_csd);
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if (err)
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goto free_card;
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err = mmc_decode_csd(card);
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if (err)
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goto free_card;
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mmc_decode_cid(card);
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}
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/*
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* Select card, as all following commands rely on that.
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*/
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if (!mmc_host_is_spi(host)) {
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err = mmc_select_card(card);
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if (err)
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goto free_card;
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}
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if (!oldcard) {
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/*
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* Fetch SCR from card.
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*/
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err = mmc_app_send_scr(card, card->raw_scr);
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if (err)
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goto free_card;
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err = mmc_decode_scr(card);
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if (err < 0)
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goto free_card;
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/*
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* Fetch switch information from card.
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*/
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#ifdef CONFIG_MMC_PARANOID_SD_INIT
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for (retries = 1; retries <= 3; retries++) {
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err = mmc_read_switch(card);
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if (!err) {
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if (retries > 1) {
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printk(KERN_WARNING
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"%s: recovered\n",
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mmc_hostname(host));
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}
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break;
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} else {
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printk(KERN_WARNING
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"%s: read switch failed (attempt %d)\n",
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mmc_hostname(host), retries);
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}
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}
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#else
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err = mmc_read_switch(card);
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#endif
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if (err)
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goto free_card;
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}
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/*
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* For SPI, enable CRC as appropriate.
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* This CRC enable is located AFTER the reading of the
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* card registers because some SDHC cards are not able
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* to provide valid CRCs for non-512-byte blocks.
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*/
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if (mmc_host_is_spi(host)) {
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err = mmc_spi_set_crc(host, use_spi_crc);
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if (err)
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goto free_card;
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}
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/*
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* Attempt to change to high-speed (if supported)
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*/
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err = mmc_switch_hs(card);
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if (err)
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goto free_card;
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/*
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* Compute bus speed.
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*/
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max_dtr = (unsigned int)-1;
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if (mmc_card_highspeed(card)) {
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if (max_dtr > card->sw_caps.hs_max_dtr)
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max_dtr = card->sw_caps.hs_max_dtr;
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} else if (max_dtr > card->csd.max_dtr) {
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max_dtr = card->csd.max_dtr;
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}
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mmc_set_clock(host, max_dtr);
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/*
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* Switch to wider bus (if supported).
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*/
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if ((host->caps & MMC_CAP_4_BIT_DATA) &&
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(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
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err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
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if (err)
|
|
goto free_card;
|
|
|
|
mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
|
|
}
|
|
|
|
/*
|
|
* Check if read-only switch is active.
|
|
*/
|
|
if (!oldcard) {
|
|
if (!host->ops->get_ro || host->ops->get_ro(host) < 0) {
|
|
printk(KERN_WARNING "%s: host does not "
|
|
"support reading read-only "
|
|
"switch. assuming write-enable.\n",
|
|
mmc_hostname(host));
|
|
} else {
|
|
if (host->ops->get_ro(host) > 0)
|
|
mmc_card_set_readonly(card);
|
|
}
|
|
}
|
|
|
|
if (!oldcard)
|
|
host->card = card;
|
|
|
|
return 0;
|
|
|
|
free_card:
|
|
if (!oldcard)
|
|
mmc_remove_card(card);
|
|
err:
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Host is being removed. Free up the current card.
|
|
*/
|
|
static void mmc_sd_remove(struct mmc_host *host)
|
|
{
|
|
BUG_ON(!host);
|
|
BUG_ON(!host->card);
|
|
|
|
mmc_remove_card(host->card);
|
|
host->card = NULL;
|
|
}
|
|
|
|
/*
|
|
* When "deferred resume" fails, run another thread to stop mmcqd.
|
|
*/
|
|
static int mmc_sd_removal_thread(void *d)
|
|
{
|
|
struct mmc_host *host = d;
|
|
|
|
mmc_sd_remove(host);
|
|
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mmc_sd_err_with_deferred_resume(struct mmc_host *host)
|
|
{
|
|
if (mmc_bus_needs_resume(host)) {
|
|
host->bus_resume_flags |= MMC_BUSRESUME_FAILS_RESUME;
|
|
kthread_run(mmc_sd_removal_thread, host, "mmcrd");
|
|
} else {
|
|
mmc_sd_remove(host);
|
|
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Card detection callback from host.
|
|
*/
|
|
static void mmc_sd_detect(struct mmc_host *host)
|
|
{
|
|
int err = 0;
|
|
#ifdef CONFIG_MMC_PARANOID_SD_INIT
|
|
int retries = 5;
|
|
#endif
|
|
|
|
BUG_ON(!host);
|
|
BUG_ON(!host->card);
|
|
|
|
mmc_claim_host(host);
|
|
|
|
/*
|
|
* Just check if our card has been removed.
|
|
*/
|
|
#ifdef CONFIG_MMC_PARANOID_SD_INIT
|
|
while(retries) {
|
|
err = mmc_send_status(host->card, NULL);
|
|
if (err) {
|
|
retries--;
|
|
udelay(5);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
if (!retries) {
|
|
printk(KERN_ERR "%s(%s): Unable to re-detect card (%d)\n",
|
|
__func__, mmc_hostname(host), err);
|
|
}
|
|
#else
|
|
err = mmc_send_status(host->card, NULL);
|
|
#endif
|
|
mmc_release_host(host);
|
|
|
|
if (err) {
|
|
mmc_sd_remove(host);
|
|
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Suspend callback from host.
|
|
*/
|
|
static int mmc_sd_suspend(struct mmc_host *host)
|
|
{
|
|
BUG_ON(!host);
|
|
BUG_ON(!host->card);
|
|
|
|
mmc_claim_host(host);
|
|
if (!mmc_host_is_spi(host))
|
|
mmc_deselect_cards(host);
|
|
host->card->state &= ~MMC_STATE_HIGHSPEED;
|
|
mmc_release_host(host);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Resume callback from host.
|
|
*
|
|
* 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;
|
|
#ifdef CONFIG_MMC_PARANOID_SD_INIT
|
|
int retries;
|
|
#endif
|
|
|
|
BUG_ON(!host);
|
|
BUG_ON(!host->card);
|
|
|
|
mmc_claim_host(host);
|
|
#ifdef CONFIG_MMC_PARANOID_SD_INIT
|
|
retries = 5;
|
|
while (retries) {
|
|
err = mmc_sd_init_card(host, host->ocr, host->card);
|
|
|
|
if (err) {
|
|
printk(KERN_ERR "%s: Re-init card rc = %d (retries = %d)\n",
|
|
mmc_hostname(host), err, retries);
|
|
mmc_power_off(host);
|
|
mdelay(5);
|
|
mmc_power_up(host);
|
|
retries--;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
#else
|
|
err = mmc_sd_init_card(host, host->ocr, host->card);
|
|
#endif
|
|
mmc_release_host(host);
|
|
|
|
#ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
|
|
if (err)
|
|
mmc_sd_err_with_deferred_resume(host);
|
|
#else
|
|
if (err) {
|
|
mmc_sd_remove(host);
|
|
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
|
|
}
|
|
#endif
|
|
|
|
return err;
|
|
}
|
|
|
|
static void mmc_sd_power_restore(struct mmc_host *host)
|
|
{
|
|
host->card->state &= ~MMC_STATE_HIGHSPEED;
|
|
mmc_claim_host(host);
|
|
mmc_sd_init_card(host, host->ocr, host->card);
|
|
mmc_release_host(host);
|
|
}
|
|
|
|
#ifdef CONFIG_MMC_UNSAFE_RESUME
|
|
|
|
static const struct mmc_bus_ops mmc_sd_ops = {
|
|
.remove = mmc_sd_remove,
|
|
.detect = mmc_sd_detect,
|
|
.suspend = mmc_sd_suspend,
|
|
.resume = mmc_sd_resume,
|
|
.power_restore = mmc_sd_power_restore,
|
|
};
|
|
|
|
static void mmc_sd_attach_bus_ops(struct mmc_host *host)
|
|
{
|
|
mmc_attach_bus(host, &mmc_sd_ops);
|
|
}
|
|
|
|
#else
|
|
|
|
static const struct mmc_bus_ops mmc_sd_ops = {
|
|
.remove = mmc_sd_remove,
|
|
.detect = mmc_sd_detect,
|
|
.suspend = NULL,
|
|
.resume = NULL,
|
|
.power_restore = mmc_sd_power_restore,
|
|
};
|
|
|
|
static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
|
|
.remove = mmc_sd_remove,
|
|
.detect = mmc_sd_detect,
|
|
.suspend = mmc_sd_suspend,
|
|
.resume = mmc_sd_resume,
|
|
.power_restore = mmc_sd_power_restore,
|
|
};
|
|
|
|
static void mmc_sd_attach_bus_ops(struct mmc_host *host)
|
|
{
|
|
const struct mmc_bus_ops *bus_ops;
|
|
|
|
if (host->caps & MMC_CAP_NONREMOVABLE)
|
|
bus_ops = &mmc_sd_ops_unsafe;
|
|
else
|
|
bus_ops = &mmc_sd_ops;
|
|
mmc_attach_bus(host, bus_ops);
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Starting point for SD card init.
|
|
*/
|
|
int mmc_attach_sd(struct mmc_host *host, u32 ocr)
|
|
{
|
|
int err;
|
|
#ifdef CONFIG_MMC_PARANOID_SD_INIT
|
|
int retries;
|
|
#endif
|
|
|
|
BUG_ON(!host);
|
|
WARN_ON(!host->claimed);
|
|
|
|
mmc_sd_attach_bus_ops(host);
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* Sanity check the voltages that the card claims to
|
|
* support.
|
|
*/
|
|
if (ocr & 0x7F) {
|
|
printk(KERN_WARNING "%s: card claims to support voltages "
|
|
"below the defined range. These will be ignored.\n",
|
|
mmc_hostname(host));
|
|
ocr &= ~0x7F;
|
|
}
|
|
|
|
if (ocr & MMC_VDD_165_195) {
|
|
printk(KERN_WARNING "%s: SD card claims to support the "
|
|
"incompletely defined 'low voltage range'. This "
|
|
"will be ignored.\n", mmc_hostname(host));
|
|
ocr &= ~MMC_VDD_165_195;
|
|
}
|
|
|
|
host->ocr = mmc_select_voltage(host, ocr);
|
|
|
|
/*
|
|
* Can we support the voltage(s) of the card(s)?
|
|
*/
|
|
if (!host->ocr) {
|
|
err = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Detect and init the card.
|
|
*/
|
|
#ifdef CONFIG_MMC_PARANOID_SD_INIT
|
|
retries = 5;
|
|
while (retries) {
|
|
err = mmc_sd_init_card(host, host->ocr, NULL);
|
|
if (err) {
|
|
retries--;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (!retries) {
|
|
printk(KERN_ERR "%s: mmc_sd_init_card() failure (err = %d)\n",
|
|
mmc_hostname(host), err);
|
|
goto err;
|
|
}
|
|
#else
|
|
err = mmc_sd_init_card(host, host->ocr, NULL);
|
|
if (err)
|
|
goto err;
|
|
#endif
|
|
|
|
mmc_release_host(host);
|
|
|
|
err = mmc_add_card(host->card);
|
|
if (err)
|
|
goto remove_card;
|
|
|
|
return 0;
|
|
|
|
remove_card:
|
|
mmc_remove_card(host->card);
|
|
host->card = NULL;
|
|
mmc_claim_host(host);
|
|
err:
|
|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
|
|
|
|
printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
|
|
mmc_hostname(host), err);
|
|
|
|
return err;
|
|
}
|
|
|