51ec92e295
Suppressing uevents turned out to be a bad idea as it screws up the order of events, making user space very confused. Change the system to use sysfs groups instead. This is a regression that, for some odd reason, has gone unnoticed for some time. It confuses hal so that the block devices (which have the mmc device as a parent) are not registered. End result being that desktop magic when cards are inserted won't work. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
628 lines
14 KiB
C
628 lines
14 KiB
C
/*
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* linux/drivers/mmc/core/mmc.c
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*
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* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
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* Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
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* MMCv4 support Copyright (C) 2006 Philip Langdale, 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 "core.h"
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#include "bus.h"
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#include "mmc_ops.h"
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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 int 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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* The selection of the format here is based upon published
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* specs from sandisk and from what people have reported.
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*/
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switch (card->csd.mmca_vsn) {
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case 0: /* MMC v1.0 - v1.2 */
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case 1: /* MMC v1.4 */
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card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
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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.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
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card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
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card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
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card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
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card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
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card->cid.month = UNSTUFF_BITS(resp, 12, 4);
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card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
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break;
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case 2: /* MMC v2.0 - v2.2 */
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case 3: /* MMC v3.1 - v3.3 */
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case 4: /* MMC v4 */
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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.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
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card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
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card->cid.month = UNSTUFF_BITS(resp, 12, 4);
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card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
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break;
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default:
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printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
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mmc_hostname(card->host), card->csd.mmca_vsn);
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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 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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* We only understand CSD structure v1.1 and v1.2.
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* v1.2 has extra information in bits 15, 11 and 10.
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*/
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csd_struct = UNSTUFF_BITS(resp, 126, 2);
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if (csd_struct != 1 && csd_struct != 2) {
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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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csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
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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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return 0;
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}
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/*
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* Read and decode extended CSD.
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*/
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static int mmc_read_ext_csd(struct mmc_card *card)
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{
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int err;
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u8 *ext_csd;
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unsigned int ext_csd_struct;
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BUG_ON(!card);
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if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
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return 0;
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/*
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* As the ext_csd is so large and mostly unused, we don't store the
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* raw block in mmc_card.
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*/
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ext_csd = kmalloc(512, GFP_KERNEL);
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if (!ext_csd) {
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printk(KERN_ERR "%s: could not allocate a buffer to "
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"receive the ext_csd.\n", mmc_hostname(card->host));
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return -ENOMEM;
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}
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err = mmc_send_ext_csd(card, ext_csd);
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if (err) {
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/*
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* We all hosts that cannot perform the command
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* to fail more gracefully
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*/
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if (err != -EINVAL)
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goto out;
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/*
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* High capacity cards should have this "magic" size
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* stored in their CSD.
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*/
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if (card->csd.capacity == (4096 * 512)) {
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printk(KERN_ERR "%s: unable to read EXT_CSD "
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"on a possible high capacity card. "
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"Card will be ignored.\n",
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mmc_hostname(card->host));
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} else {
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printk(KERN_WARNING "%s: unable to read "
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"EXT_CSD, performance might "
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"suffer.\n",
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mmc_hostname(card->host));
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err = 0;
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}
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goto out;
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}
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ext_csd_struct = ext_csd[EXT_CSD_REV];
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if (ext_csd_struct > 2) {
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printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
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"version %d\n", mmc_hostname(card->host),
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ext_csd_struct);
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err = -EINVAL;
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goto out;
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}
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if (ext_csd_struct >= 2) {
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card->ext_csd.sectors =
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ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
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ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
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ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
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ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
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if (card->ext_csd.sectors)
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mmc_card_set_blockaddr(card);
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}
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switch (ext_csd[EXT_CSD_CARD_TYPE]) {
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case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
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card->ext_csd.hs_max_dtr = 52000000;
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break;
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case EXT_CSD_CARD_TYPE_26:
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card->ext_csd.hs_max_dtr = 26000000;
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break;
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default:
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/* MMC v4 spec says this cannot happen */
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printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
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"support any high-speed modes.\n",
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mmc_hostname(card->host));
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goto out;
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}
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out:
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kfree(ext_csd);
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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(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 *mmc_std_attrs[] = {
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&dev_attr_cid.attr,
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&dev_attr_csd.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 mmc_std_attr_group = {
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.attrs = mmc_std_attrs,
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};
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static struct attribute_group *mmc_attr_groups[] = {
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&mmc_std_attr_group,
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NULL,
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};
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static struct device_type mmc_type = {
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.groups = mmc_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, "curcard" will contain the card
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* we're trying to reinitialise.
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*/
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static int mmc_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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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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/* The extra bit indicates that we support high capacity */
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err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
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if (err)
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goto err;
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/*
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* For SPI, enable CRC as appropriate.
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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 err;
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}
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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, &mmc_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_MMC;
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card->rca = 1;
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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: set 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_set_relative_addr(card);
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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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err = mmc_decode_cid(card);
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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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* 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 and process extended CSD.
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*/
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err = mmc_read_ext_csd(card);
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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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* Activate high speed (if supported)
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*/
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if ((card->ext_csd.hs_max_dtr != 0) &&
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(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
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err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
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EXT_CSD_HS_TIMING, 1);
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if (err)
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goto free_card;
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mmc_card_set_highspeed(card);
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mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
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}
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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->ext_csd.hs_max_dtr)
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max_dtr = card->ext_csd.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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* Activate wide bus (if supported).
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*/
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if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
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(host->caps & MMC_CAP_4_BIT_DATA)) {
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err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
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EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
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if (err)
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goto free_card;
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mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
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}
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if (!oldcard)
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host->card = card;
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return 0;
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free_card:
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if (!oldcard)
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mmc_remove_card(card);
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err:
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return err;
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}
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/*
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* Host is being removed. Free up the current card.
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*/
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static void mmc_remove(struct mmc_host *host)
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{
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BUG_ON(!host);
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BUG_ON(!host->card);
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mmc_remove_card(host->card);
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host->card = NULL;
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}
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/*
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* Card detection callback from host.
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*/
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static void mmc_detect(struct mmc_host *host)
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{
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int err;
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BUG_ON(!host);
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BUG_ON(!host->card);
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mmc_claim_host(host);
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/*
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* Just check if our card has been removed.
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*/
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err = mmc_send_status(host->card, NULL);
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mmc_release_host(host);
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|
|
|
if (err) {
|
|
mmc_remove(host);
|
|
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_MMC_UNSAFE_RESUME
|
|
|
|
/*
|
|
* Suspend callback from host.
|
|
*/
|
|
static void mmc_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);
|
|
}
|
|
|
|
/*
|
|
* 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 void mmc_resume(struct mmc_host *host)
|
|
{
|
|
int err;
|
|
|
|
BUG_ON(!host);
|
|
BUG_ON(!host->card);
|
|
|
|
mmc_claim_host(host);
|
|
err = mmc_init_card(host, host->ocr, host->card);
|
|
mmc_release_host(host);
|
|
|
|
if (err) {
|
|
mmc_remove(host);
|
|
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
|
|
}
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
#define mmc_suspend NULL
|
|
#define mmc_resume NULL
|
|
|
|
#endif
|
|
|
|
static const struct mmc_bus_ops mmc_ops = {
|
|
.remove = mmc_remove,
|
|
.detect = mmc_detect,
|
|
.suspend = mmc_suspend,
|
|
.resume = mmc_resume,
|
|
};
|
|
|
|
/*
|
|
* Starting point for MMC card init.
|
|
*/
|
|
int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
|
|
{
|
|
int err;
|
|
|
|
BUG_ON(!host);
|
|
WARN_ON(!host->claimed);
|
|
|
|
mmc_attach_bus(host, &mmc_ops);
|
|
|
|
/*
|
|
* We need to get OCR a different way for SPI.
|
|
*/
|
|
if (mmc_host_is_spi(host)) {
|
|
err = mmc_spi_read_ocr(host, 1, &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;
|
|
}
|
|
|
|
host->ocr = mmc_select_voltage(host, ocr);
|
|
|
|
/*
|
|
* Can we support the voltage of the card?
|
|
*/
|
|
if (!host->ocr) {
|
|
err = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Detect and init the card.
|
|
*/
|
|
err = mmc_init_card(host, host->ocr, NULL);
|
|
if (err)
|
|
goto err;
|
|
|
|
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 MMC card\n",
|
|
mmc_hostname(host), err);
|
|
|
|
return err;
|
|
}
|
|
|