![Jarkko Lavinen](/assets/img/avatar_default.png)
Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
638 lines
14 KiB
C
638 lines
14 KiB
C
/*
|
|
* linux/drivers/mmc/core/mmc.c
|
|
*
|
|
* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
|
|
* Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
|
|
* MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
|
|
#include <linux/mmc/host.h>
|
|
#include <linux/mmc/card.h>
|
|
#include <linux/mmc/mmc.h>
|
|
|
|
#include "core.h"
|
|
#include "bus.h"
|
|
#include "mmc_ops.h"
|
|
|
|
static const unsigned int tran_exp[] = {
|
|
10000, 100000, 1000000, 10000000,
|
|
0, 0, 0, 0
|
|
};
|
|
|
|
static const unsigned char tran_mant[] = {
|
|
0, 10, 12, 13, 15, 20, 25, 30,
|
|
35, 40, 45, 50, 55, 60, 70, 80,
|
|
};
|
|
|
|
static const unsigned int tacc_exp[] = {
|
|
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
|
|
};
|
|
|
|
static const unsigned int tacc_mant[] = {
|
|
0, 10, 12, 13, 15, 20, 25, 30,
|
|
35, 40, 45, 50, 55, 60, 70, 80,
|
|
};
|
|
|
|
#define UNSTUFF_BITS(resp,start,size) \
|
|
({ \
|
|
const int __size = size; \
|
|
const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
|
|
const int __off = 3 - ((start) / 32); \
|
|
const int __shft = (start) & 31; \
|
|
u32 __res; \
|
|
\
|
|
__res = resp[__off] >> __shft; \
|
|
if (__size + __shft > 32) \
|
|
__res |= resp[__off-1] << ((32 - __shft) % 32); \
|
|
__res & __mask; \
|
|
})
|
|
|
|
/*
|
|
* Given the decoded CSD structure, decode the raw CID to our CID structure.
|
|
*/
|
|
static int mmc_decode_cid(struct mmc_card *card)
|
|
{
|
|
u32 *resp = card->raw_cid;
|
|
|
|
/*
|
|
* The selection of the format here is based upon published
|
|
* specs from sandisk and from what people have reported.
|
|
*/
|
|
switch (card->csd.mmca_vsn) {
|
|
case 0: /* MMC v1.0 - v1.2 */
|
|
case 1: /* MMC v1.4 */
|
|
card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
|
|
card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
|
|
card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
|
|
card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
|
|
card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
|
|
card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
|
|
card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
|
|
card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
|
|
card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
|
|
card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
|
|
card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
|
|
card->cid.month = UNSTUFF_BITS(resp, 12, 4);
|
|
card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
|
|
break;
|
|
|
|
case 2: /* MMC v2.0 - v2.2 */
|
|
case 3: /* MMC v3.1 - v3.3 */
|
|
case 4: /* MMC v4 */
|
|
card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
|
|
card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
|
|
card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
|
|
card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
|
|
card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
|
|
card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
|
|
card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
|
|
card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
|
|
card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
|
|
card->cid.month = UNSTUFF_BITS(resp, 12, 4);
|
|
card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
|
|
mmc_hostname(card->host), card->csd.mmca_vsn);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Given a 128-bit response, decode to our card CSD structure.
|
|
*/
|
|
static int mmc_decode_csd(struct mmc_card *card)
|
|
{
|
|
struct mmc_csd *csd = &card->csd;
|
|
unsigned int e, m, csd_struct;
|
|
u32 *resp = card->raw_csd;
|
|
|
|
/*
|
|
* We only understand CSD structure v1.1 and v1.2.
|
|
* v1.2 has extra information in bits 15, 11 and 10.
|
|
*/
|
|
csd_struct = UNSTUFF_BITS(resp, 126, 2);
|
|
if (csd_struct != 1 && csd_struct != 2) {
|
|
printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
|
|
mmc_hostname(card->host), csd_struct);
|
|
return -EINVAL;
|
|
}
|
|
|
|
csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
|
|
m = UNSTUFF_BITS(resp, 115, 4);
|
|
e = UNSTUFF_BITS(resp, 112, 3);
|
|
csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
|
|
csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
|
|
|
|
m = UNSTUFF_BITS(resp, 99, 4);
|
|
e = UNSTUFF_BITS(resp, 96, 3);
|
|
csd->max_dtr = tran_exp[e] * tran_mant[m];
|
|
csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
|
|
|
|
e = UNSTUFF_BITS(resp, 47, 3);
|
|
m = UNSTUFF_BITS(resp, 62, 12);
|
|
csd->capacity = (1 + m) << (e + 2);
|
|
|
|
csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
|
|
csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
|
|
csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
|
|
csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
|
|
csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
|
|
csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
|
|
csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read and decode extended CSD.
|
|
*/
|
|
static int mmc_read_ext_csd(struct mmc_card *card)
|
|
{
|
|
int err;
|
|
u8 *ext_csd;
|
|
unsigned int ext_csd_struct;
|
|
|
|
BUG_ON(!card);
|
|
|
|
if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
|
|
return 0;
|
|
|
|
/*
|
|
* As the ext_csd is so large and mostly unused, we don't store the
|
|
* raw block in mmc_card.
|
|
*/
|
|
ext_csd = kmalloc(512, GFP_KERNEL);
|
|
if (!ext_csd) {
|
|
printk(KERN_ERR "%s: could not allocate a buffer to "
|
|
"receive the ext_csd.\n", mmc_hostname(card->host));
|
|
return -ENOMEM;
|
|
}
|
|
|
|
err = mmc_send_ext_csd(card, ext_csd);
|
|
if (err) {
|
|
/*
|
|
* We all hosts that cannot perform the command
|
|
* to fail more gracefully
|
|
*/
|
|
if (err != -EINVAL)
|
|
goto out;
|
|
|
|
/*
|
|
* High capacity cards should have this "magic" size
|
|
* stored in their CSD.
|
|
*/
|
|
if (card->csd.capacity == (4096 * 512)) {
|
|
printk(KERN_ERR "%s: unable to read EXT_CSD "
|
|
"on a possible high capacity card. "
|
|
"Card will be ignored.\n",
|
|
mmc_hostname(card->host));
|
|
} else {
|
|
printk(KERN_WARNING "%s: unable to read "
|
|
"EXT_CSD, performance might "
|
|
"suffer.\n",
|
|
mmc_hostname(card->host));
|
|
err = 0;
|
|
}
|
|
|
|
goto out;
|
|
}
|
|
|
|
ext_csd_struct = ext_csd[EXT_CSD_REV];
|
|
if (ext_csd_struct > 3) {
|
|
printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
|
|
"version %d\n", mmc_hostname(card->host),
|
|
ext_csd_struct);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (ext_csd_struct >= 2) {
|
|
card->ext_csd.sectors =
|
|
ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
|
|
ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
|
|
ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
|
|
ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
|
|
if (card->ext_csd.sectors)
|
|
mmc_card_set_blockaddr(card);
|
|
}
|
|
|
|
switch (ext_csd[EXT_CSD_CARD_TYPE]) {
|
|
case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
|
|
card->ext_csd.hs_max_dtr = 52000000;
|
|
break;
|
|
case EXT_CSD_CARD_TYPE_26:
|
|
card->ext_csd.hs_max_dtr = 26000000;
|
|
break;
|
|
default:
|
|
/* MMC v4 spec says this cannot happen */
|
|
printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
|
|
"support any high-speed modes.\n",
|
|
mmc_hostname(card->host));
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
kfree(ext_csd);
|
|
|
|
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(date, "%02d/%04d\n", card->cid.month, card->cid.year);
|
|
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);
|
|
|
|
static struct attribute *mmc_std_attrs[] = {
|
|
&dev_attr_cid.attr,
|
|
&dev_attr_csd.attr,
|
|
&dev_attr_date.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,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group mmc_std_attr_group = {
|
|
.attrs = mmc_std_attrs,
|
|
};
|
|
|
|
static struct attribute_group *mmc_attr_groups[] = {
|
|
&mmc_std_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static struct device_type mmc_type = {
|
|
.groups = mmc_attr_groups,
|
|
};
|
|
|
|
/*
|
|
* 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_init_card(struct mmc_host *host, u32 ocr,
|
|
struct mmc_card *oldcard)
|
|
{
|
|
struct mmc_card *card;
|
|
int err;
|
|
u32 cid[4];
|
|
unsigned int max_dtr;
|
|
|
|
BUG_ON(!host);
|
|
WARN_ON(!host->claimed);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/* The extra bit indicates that we support high capacity */
|
|
err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
|
|
if (err)
|
|
goto err;
|
|
|
|
/*
|
|
* For SPI, enable CRC as appropriate.
|
|
*/
|
|
if (mmc_host_is_spi(host)) {
|
|
err = mmc_spi_set_crc(host, use_spi_crc);
|
|
if (err)
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Fetch CID from card.
|
|
*/
|
|
if (mmc_host_is_spi(host))
|
|
err = mmc_send_cid(host, cid);
|
|
else
|
|
err = mmc_all_send_cid(host, cid);
|
|
if (err)
|
|
goto err;
|
|
|
|
if (oldcard) {
|
|
if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
|
|
err = -ENOENT;
|
|
goto err;
|
|
}
|
|
|
|
card = oldcard;
|
|
} else {
|
|
/*
|
|
* Allocate card structure.
|
|
*/
|
|
card = mmc_alloc_card(host, &mmc_type);
|
|
if (IS_ERR(card)) {
|
|
err = PTR_ERR(card);
|
|
goto err;
|
|
}
|
|
|
|
card->type = MMC_TYPE_MMC;
|
|
card->rca = 1;
|
|
memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
|
|
}
|
|
|
|
/*
|
|
* For native busses: set card RCA and quit open drain mode.
|
|
*/
|
|
if (!mmc_host_is_spi(host)) {
|
|
err = mmc_set_relative_addr(card);
|
|
if (err)
|
|
goto free_card;
|
|
|
|
mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
|
|
}
|
|
|
|
if (!oldcard) {
|
|
/*
|
|
* Fetch CSD from card.
|
|
*/
|
|
err = mmc_send_csd(card, card->raw_csd);
|
|
if (err)
|
|
goto free_card;
|
|
|
|
err = mmc_decode_csd(card);
|
|
if (err)
|
|
goto free_card;
|
|
err = mmc_decode_cid(card);
|
|
if (err)
|
|
goto free_card;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
if (!oldcard) {
|
|
/*
|
|
* Fetch and process extended CSD.
|
|
*/
|
|
err = mmc_read_ext_csd(card);
|
|
if (err)
|
|
goto free_card;
|
|
}
|
|
|
|
/*
|
|
* Activate high speed (if supported)
|
|
*/
|
|
if ((card->ext_csd.hs_max_dtr != 0) &&
|
|
(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
|
|
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
|
|
EXT_CSD_HS_TIMING, 1);
|
|
if (err)
|
|
goto free_card;
|
|
|
|
mmc_card_set_highspeed(card);
|
|
|
|
mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
|
|
}
|
|
|
|
/*
|
|
* Compute bus speed.
|
|
*/
|
|
max_dtr = (unsigned int)-1;
|
|
|
|
if (mmc_card_highspeed(card)) {
|
|
if (max_dtr > card->ext_csd.hs_max_dtr)
|
|
max_dtr = card->ext_csd.hs_max_dtr;
|
|
} else if (max_dtr > card->csd.max_dtr) {
|
|
max_dtr = card->csd.max_dtr;
|
|
}
|
|
|
|
mmc_set_clock(host, max_dtr);
|
|
|
|
/*
|
|
* Activate wide bus (if supported).
|
|
*/
|
|
if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
|
|
(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
|
|
unsigned ext_csd_bit, bus_width;
|
|
|
|
if (host->caps & MMC_CAP_8_BIT_DATA) {
|
|
ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
|
|
bus_width = MMC_BUS_WIDTH_8;
|
|
} else {
|
|
ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
|
|
bus_width = MMC_BUS_WIDTH_4;
|
|
}
|
|
|
|
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
|
|
EXT_CSD_BUS_WIDTH, ext_csd_bit);
|
|
|
|
if (err)
|
|
goto free_card;
|
|
|
|
mmc_set_bus_width(card->host, bus_width);
|
|
}
|
|
|
|
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_remove(struct mmc_host *host)
|
|
{
|
|
BUG_ON(!host);
|
|
BUG_ON(!host->card);
|
|
|
|
mmc_remove_card(host->card);
|
|
host->card = NULL;
|
|
}
|
|
|
|
/*
|
|
* Card detection callback from host.
|
|
*/
|
|
static void mmc_detect(struct mmc_host *host)
|
|
{
|
|
int err;
|
|
|
|
BUG_ON(!host);
|
|
BUG_ON(!host->card);
|
|
|
|
mmc_claim_host(host);
|
|
|
|
/*
|
|
* Just check if our card has been removed.
|
|
*/
|
|
err = mmc_send_status(host->card, NULL);
|
|
|
|
mmc_release_host(host);
|
|
|
|
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;
|
|
}
|