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3d705d14fe
linux/drivers/mmc/core/mmc.c
Sascha Hauer 3d705d14fe mmc: implement Driver Stage Register handling 
Some eMMC and SD cards implement a DSR register that allows to tune
raise/fall times and drive strength of the CMD and DATA outputs.
The values to use depend on the card in use and the host.
It might be needed to reduce the drive strength to prevent voltage peaks
above the host's specification.

Implement a 'dsr' devicetree property that allows to specify the value
to set the DSR to. For non-dt setups the new members of mmc_host can be
set by board code.

This patch was initially authored by Sascha Hauer. It contains
improvements authored by Markus Niebel and Uwe Kleine-König.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-09-09 13:59:07 +02:00

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/*
* 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/slab.h>
#include <linux/stat.h>
#include <linux/pm_runtime.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"
#include "sd_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.prv = UNSTUFF_BITS(resp, 48, 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:
pr_err("%s: card has unknown MMCA version %d\n",
mmc_hostname(card->host), card->csd.mmca_vsn);
return -EINVAL;
}
return 0;
}
static void mmc_set_erase_size(struct mmc_card *card)
{
if (card->ext_csd.erase_group_def & 1)
card->erase_size = card->ext_csd.hc_erase_size;
else
card->erase_size = card->csd.erase_size;
mmc_init_erase(card);
}
/*
* 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, a, b;
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.
* We also support eMMC v4.4 & v4.41.
*/
csd->structure = UNSTUFF_BITS(resp, 126, 2);
if (csd->structure == 0) {
pr_err("%s: unrecognised CSD structure version %d\n",
mmc_hostname(card->host), csd->structure);
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->dsr_imp = UNSTUFF_BITS(resp, 76, 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);
if (csd->write_blkbits >= 9) {
a = UNSTUFF_BITS(resp, 42, 5);
b = UNSTUFF_BITS(resp, 37, 5);
csd->erase_size = (a + 1) * (b + 1);
csd->erase_size <<= csd->write_blkbits - 9;
}
return 0;
}
/*
* Read extended CSD.
*/
static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
{
int err;
u8 *ext_csd;
BUG_ON(!card);
BUG_ON(!new_ext_csd);
*new_ext_csd = NULL;
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) {
pr_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) {
kfree(ext_csd);
*new_ext_csd = NULL;
/* If the host or the card can't do the switch,
* fail more gracefully. */
if ((err != -EINVAL)
&& (err != -ENOSYS)
&& (err != -EFAULT))
return err;
/*
* High capacity cards should have this "magic" size
* stored in their CSD.
*/
if (card->csd.capacity == (4096 * 512)) {
pr_err("%s: unable to read EXT_CSD "
"on a possible high capacity card. "
"Card will be ignored.\n",
mmc_hostname(card->host));
} else {
pr_warning("%s: unable to read "
"EXT_CSD, performance might "
"suffer.\n",
mmc_hostname(card->host));
err = 0;
}
} else
*new_ext_csd = ext_csd;
return err;
}
static void mmc_select_card_type(struct mmc_card *card)
{
struct mmc_host *host = card->host;
u8 card_type = card->ext_csd.raw_card_type;
u32 caps = host->caps, caps2 = host->caps2;
unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
unsigned int avail_type = 0;
if (caps & MMC_CAP_MMC_HIGHSPEED &&
card_type & EXT_CSD_CARD_TYPE_HS_26) {
hs_max_dtr = MMC_HIGH_26_MAX_DTR;
avail_type |= EXT_CSD_CARD_TYPE_HS_26;
}
if (caps & MMC_CAP_MMC_HIGHSPEED &&
card_type & EXT_CSD_CARD_TYPE_HS_52) {
hs_max_dtr = MMC_HIGH_52_MAX_DTR;
avail_type |= EXT_CSD_CARD_TYPE_HS_52;
}
if (caps & MMC_CAP_1_8V_DDR &&
card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
}
if (caps & MMC_CAP_1_2V_DDR &&
card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
}
if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
hs200_max_dtr = MMC_HS200_MAX_DTR;
avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
}
if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
hs200_max_dtr = MMC_HS200_MAX_DTR;
avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
}
if (caps2 & MMC_CAP2_HS400_1_8V &&
card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
hs200_max_dtr = MMC_HS200_MAX_DTR;
avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
}
if (caps2 & MMC_CAP2_HS400_1_2V &&
card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
hs200_max_dtr = MMC_HS200_MAX_DTR;
avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
}
card->ext_csd.hs_max_dtr = hs_max_dtr;
card->ext_csd.hs200_max_dtr = hs200_max_dtr;
card->mmc_avail_type = avail_type;
}
/*
* Decode extended CSD.
*/
static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
{
int err = 0, idx;
unsigned int part_size;
u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
BUG_ON(!card);
if (!ext_csd)
return 0;
/* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
if (card->csd.structure == 3) {
if (card->ext_csd.raw_ext_csd_structure > 2) {
pr_err("%s: unrecognised EXT_CSD structure "
"version %d\n", mmc_hostname(card->host),
card->ext_csd.raw_ext_csd_structure);
err = -EINVAL;
goto out;
}
}
/*
* The EXT_CSD format is meant to be forward compatible. As long
* as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
* are authorized, see JEDEC JESD84-B50 section B.8.
*/
card->ext_csd.rev = ext_csd[EXT_CSD_REV];
card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
if (card->ext_csd.rev >= 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;
/* Cards with density > 2GiB are sector addressed */
if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
mmc_card_set_blockaddr(card);
}
card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
mmc_select_card_type(card);
card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
card->ext_csd.raw_erase_timeout_mult =
ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
card->ext_csd.raw_hc_erase_grp_size =
ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
if (card->ext_csd.rev >= 3) {
u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
/* EXT_CSD value is in units of 10ms, but we store in ms */
card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
/* Sleep / awake timeout in 100ns units */
if (sa_shift > 0 && sa_shift <= 0x17)
card->ext_csd.sa_timeout =
1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
card->ext_csd.erase_group_def =
ext_csd[EXT_CSD_ERASE_GROUP_DEF];
card->ext_csd.hc_erase_timeout = 300 *
ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
card->ext_csd.hc_erase_size =
ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
/*
* There are two boot regions of equal size, defined in
* multiples of 128K.
*/
if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
mmc_part_add(card, part_size,
EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
"boot%d", idx, true,
MMC_BLK_DATA_AREA_BOOT);
}
}
}
card->ext_csd.raw_hc_erase_gap_size =
ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
card->ext_csd.raw_sec_trim_mult =
ext_csd[EXT_CSD_SEC_TRIM_MULT];
card->ext_csd.raw_sec_erase_mult =
ext_csd[EXT_CSD_SEC_ERASE_MULT];
card->ext_csd.raw_sec_feature_support =
ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
card->ext_csd.raw_trim_mult =
ext_csd[EXT_CSD_TRIM_MULT];
card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
if (card->ext_csd.rev >= 4) {
/*
* Enhanced area feature support -- check whether the eMMC
* card has the Enhanced area enabled. If so, export enhanced
* area offset and size to user by adding sysfs interface.
*/
if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
(ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
hc_erase_grp_sz =
ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
hc_wp_grp_sz =
ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
card->ext_csd.enhanced_area_en = 1;
/*
* calculate the enhanced data area offset, in bytes
*/
card->ext_csd.enhanced_area_offset =
(ext_csd[139] << 24) + (ext_csd[138] << 16) +
(ext_csd[137] << 8) + ext_csd[136];
if (mmc_card_blockaddr(card))
card->ext_csd.enhanced_area_offset <<= 9;
/*
* calculate the enhanced data area size, in kilobytes
*/
card->ext_csd.enhanced_area_size =
(ext_csd[142] << 16) + (ext_csd[141] << 8) +
ext_csd[140];
card->ext_csd.enhanced_area_size *=
(size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
card->ext_csd.enhanced_area_size <<= 9;
} else {
/*
* If the enhanced area is not enabled, disable these
* device attributes.
*/
card->ext_csd.enhanced_area_offset = -EINVAL;
card->ext_csd.enhanced_area_size = -EINVAL;
}
/*
* General purpose partition feature support --
* If ext_csd has the size of general purpose partitions,
* set size, part_cfg, partition name in mmc_part.
*/
if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
EXT_CSD_PART_SUPPORT_PART_EN) {
if (card->ext_csd.enhanced_area_en != 1) {
hc_erase_grp_sz =
ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
hc_wp_grp_sz =
ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
card->ext_csd.enhanced_area_en = 1;
}
for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
continue;
part_size =
(ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
<< 16) +
(ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
<< 8) +
ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
part_size *= (size_t)(hc_erase_grp_sz *
hc_wp_grp_sz);
mmc_part_add(card, part_size << 19,
EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
"gp%d", idx, false,
MMC_BLK_DATA_AREA_GP);
}
}
card->ext_csd.sec_trim_mult =
ext_csd[EXT_CSD_SEC_TRIM_MULT];
card->ext_csd.sec_erase_mult =
ext_csd[EXT_CSD_SEC_ERASE_MULT];
card->ext_csd.sec_feature_support =
ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
card->ext_csd.trim_timeout = 300 *
ext_csd[EXT_CSD_TRIM_MULT];
/*
* Note that the call to mmc_part_add above defaults to read
* only. If this default assumption is changed, the call must
* take into account the value of boot_locked below.
*/
card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
card->ext_csd.boot_ro_lockable = true;
/* Save power class values */
card->ext_csd.raw_pwr_cl_52_195 =
ext_csd[EXT_CSD_PWR_CL_52_195];
card->ext_csd.raw_pwr_cl_26_195 =
ext_csd[EXT_CSD_PWR_CL_26_195];
card->ext_csd.raw_pwr_cl_52_360 =
ext_csd[EXT_CSD_PWR_CL_52_360];
card->ext_csd.raw_pwr_cl_26_360 =
ext_csd[EXT_CSD_PWR_CL_26_360];
card->ext_csd.raw_pwr_cl_200_195 =
ext_csd[EXT_CSD_PWR_CL_200_195];
card->ext_csd.raw_pwr_cl_200_360 =
ext_csd[EXT_CSD_PWR_CL_200_360];
card->ext_csd.raw_pwr_cl_ddr_52_195 =
ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
card->ext_csd.raw_pwr_cl_ddr_52_360 =
ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
card->ext_csd.raw_pwr_cl_ddr_200_360 =
ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
}
if (card->ext_csd.rev >= 5) {
/* Adjust production date as per JEDEC JESD84-B451 */
if (card->cid.year < 2010)
card->cid.year += 16;
/* check whether the eMMC card supports BKOPS */
if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
card->ext_csd.bkops = 1;
card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN];
card->ext_csd.raw_bkops_status =
ext_csd[EXT_CSD_BKOPS_STATUS];
if (!card->ext_csd.bkops_en)
pr_info("%s: BKOPS_EN bit is not set\n",
mmc_hostname(card->host));
}
/* check whether the eMMC card supports HPI */
if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
card->ext_csd.hpi = 1;
if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
else
card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
/*
* Indicate the maximum timeout to close
* a command interrupted by HPI
*/
card->ext_csd.out_of_int_time =
ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
}
card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
/*
* RPMB regions are defined in multiples of 128K.
*/
card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
EXT_CSD_PART_CONFIG_ACC_RPMB,
"rpmb", 0, false,
MMC_BLK_DATA_AREA_RPMB);
}
}
card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
card->erased_byte = 0xFF;
else
card->erased_byte = 0x0;
/* eMMC v4.5 or later */
if (card->ext_csd.rev >= 6) {
card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
card->ext_csd.generic_cmd6_time = 10 *
ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
card->ext_csd.power_off_longtime = 10 *
ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
card->ext_csd.cache_size =
ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
card->ext_csd.data_sector_size = 4096;
else
card->ext_csd.data_sector_size = 512;
if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
(ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
card->ext_csd.data_tag_unit_size =
((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
(card->ext_csd.data_sector_size);
} else {
card->ext_csd.data_tag_unit_size = 0;
}
card->ext_csd.max_packed_writes =
ext_csd[EXT_CSD_MAX_PACKED_WRITES];
card->ext_csd.max_packed_reads =
ext_csd[EXT_CSD_MAX_PACKED_READS];
} else {
card->ext_csd.data_sector_size = 512;
}
out:
return err;
}
static inline void mmc_free_ext_csd(u8 *ext_csd)
{
kfree(ext_csd);
}
static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
{
u8 *bw_ext_csd;
int err;
if (bus_width == MMC_BUS_WIDTH_1)
return 0;
err = mmc_get_ext_csd(card, &bw_ext_csd);
if (err || bw_ext_csd == NULL) {
err = -EINVAL;
goto out;
}
/* only compare read only fields */
err = !((card->ext_csd.raw_partition_support ==
bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
(card->ext_csd.raw_erased_mem_count ==
bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
(card->ext_csd.rev ==
bw_ext_csd[EXT_CSD_REV]) &&
(card->ext_csd.raw_ext_csd_structure ==
bw_ext_csd[EXT_CSD_STRUCTURE]) &&
(card->ext_csd.raw_card_type ==
bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
(card->ext_csd.raw_s_a_timeout ==
bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
(card->ext_csd.raw_hc_erase_gap_size ==
bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
(card->ext_csd.raw_erase_timeout_mult ==
bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
(card->ext_csd.raw_hc_erase_grp_size ==
bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
(card->ext_csd.raw_sec_trim_mult ==
bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
(card->ext_csd.raw_sec_erase_mult ==
bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
(card->ext_csd.raw_sec_feature_support ==
bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
(card->ext_csd.raw_trim_mult ==
bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
(card->ext_csd.raw_sectors[0] ==
bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
(card->ext_csd.raw_sectors[1] ==
bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
(card->ext_csd.raw_sectors[2] ==
bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
(card->ext_csd.raw_sectors[3] ==
bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
(card->ext_csd.raw_pwr_cl_52_195 ==
bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
(card->ext_csd.raw_pwr_cl_26_195 ==
bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
(card->ext_csd.raw_pwr_cl_52_360 ==
bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
(card->ext_csd.raw_pwr_cl_26_360 ==
bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
(card->ext_csd.raw_pwr_cl_200_195 ==
bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
(card->ext_csd.raw_pwr_cl_200_360 ==
bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
(card->ext_csd.raw_pwr_cl_ddr_52_195 ==
bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
(card->ext_csd.raw_pwr_cl_ddr_52_360 ==
bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
(card->ext_csd.raw_pwr_cl_ddr_200_360 ==
bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
if (err)
err = -EINVAL;
out:
mmc_free_ext_csd(bw_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(erase_size, "%u\n", card->erase_size << 9);
MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
card->ext_csd.enhanced_area_offset);
MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
static struct attribute *mmc_std_attrs[] = {
&dev_attr_cid.attr,
&dev_attr_csd.attr,
&dev_attr_date.attr,
&dev_attr_erase_size.attr,
&dev_attr_preferred_erase_size.attr,
&dev_attr_fwrev.attr,
&dev_attr_hwrev.attr,
&dev_attr_manfid.attr,
&dev_attr_name.attr,
&dev_attr_oemid.attr,
&dev_attr_prv.attr,
&dev_attr_serial.attr,
&dev_attr_enhanced_area_offset.attr,
&dev_attr_enhanced_area_size.attr,
&dev_attr_raw_rpmb_size_mult.attr,
&dev_attr_rel_sectors.attr,
NULL,
};
ATTRIBUTE_GROUPS(mmc_std);
static struct device_type mmc_type = {
.groups = mmc_std_groups,
};
/*
* Select the PowerClass for the current bus width
* If power class is defined for 4/8 bit bus in the
* extended CSD register, select it by executing the
* mmc_switch command.
*/
static int __mmc_select_powerclass(struct mmc_card *card,
unsigned int bus_width)
{
struct mmc_host *host = card->host;
struct mmc_ext_csd *ext_csd = &card->ext_csd;
unsigned int pwrclass_val = 0;
int err = 0;
/* Power class selection is supported for versions >= 4.0 */
if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
return 0;
/* Power class values are defined only for 4/8 bit bus */
if (bus_width == EXT_CSD_BUS_WIDTH_1)
return 0;
switch (1 << host->ios.vdd) {
case MMC_VDD_165_195:
if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
pwrclass_val = ext_csd->raw_pwr_cl_26_195;
else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
ext_csd->raw_pwr_cl_52_195 :
ext_csd->raw_pwr_cl_ddr_52_195;
else if (host->ios.clock <= MMC_HS200_MAX_DTR)
pwrclass_val = ext_csd->raw_pwr_cl_200_195;
break;
case MMC_VDD_27_28:
case MMC_VDD_28_29:
case MMC_VDD_29_30:
case MMC_VDD_30_31:
case MMC_VDD_31_32:
case MMC_VDD_32_33:
case MMC_VDD_33_34:
case MMC_VDD_34_35:
case MMC_VDD_35_36:
if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
pwrclass_val = ext_csd->raw_pwr_cl_26_360;
else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
ext_csd->raw_pwr_cl_52_360 :
ext_csd->raw_pwr_cl_ddr_52_360;
else if (host->ios.clock <= MMC_HS200_MAX_DTR)
pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
ext_csd->raw_pwr_cl_ddr_200_360 :
ext_csd->raw_pwr_cl_200_360;
break;
default:
pr_warning("%s: Voltage range not supported "
"for power class.\n", mmc_hostname(host));
return -EINVAL;
}
if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
EXT_CSD_PWR_CL_8BIT_SHIFT;
else
pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
EXT_CSD_PWR_CL_4BIT_SHIFT;
/* If the power class is different from the default value */
if (pwrclass_val > 0) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_POWER_CLASS,
pwrclass_val,
card->ext_csd.generic_cmd6_time);
}
return err;
}
static int mmc_select_powerclass(struct mmc_card *card)
{
struct mmc_host *host = card->host;
u32 bus_width, ext_csd_bits;
int err, ddr;
/* Power class selection is supported for versions >= 4.0 */
if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
return 0;
bus_width = host->ios.bus_width;
/* Power class values are defined only for 4/8 bit bus */
if (bus_width == MMC_BUS_WIDTH_1)
return 0;
ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
if (ddr)
ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
else
ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
err = __mmc_select_powerclass(card, ext_csd_bits);
if (err)
pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
mmc_hostname(host), 1 << bus_width, ddr);
return err;
}
/*
* Set the bus speed for the selected speed mode.
*/
static void mmc_set_bus_speed(struct mmc_card *card)
{
unsigned int max_dtr = (unsigned int)-1;
if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
max_dtr > card->ext_csd.hs200_max_dtr)
max_dtr = card->ext_csd.hs200_max_dtr;
else if (mmc_card_hs(card) && 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(card->host, max_dtr);
}
/*
* Select the bus width amoung 4-bit and 8-bit(SDR).
* If the bus width is changed successfully, return the selected width value.
* Zero is returned instead of error value if the wide width is not supported.
*/
static int mmc_select_bus_width(struct mmc_card *card)
{
static unsigned ext_csd_bits[] = {
EXT_CSD_BUS_WIDTH_8,
EXT_CSD_BUS_WIDTH_4,
};
static unsigned bus_widths[] = {
MMC_BUS_WIDTH_8,
MMC_BUS_WIDTH_4,
};
struct mmc_host *host = card->host;
unsigned idx, bus_width = 0;
int err = 0;
if ((card->csd.mmca_vsn < CSD_SPEC_VER_4) &&
!(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
return 0;
idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
/*
* Unlike SD, MMC cards dont have a configuration register to notify
* supported bus width. So bus test command should be run to identify
* the supported bus width or compare the ext csd values of current
* bus width and ext csd values of 1 bit mode read earlier.
*/
for (; idx < ARRAY_SIZE(bus_widths); idx++) {
/*
* Host is capable of 8bit transfer, then switch
* the device to work in 8bit transfer mode. If the
* mmc switch command returns error then switch to
* 4bit transfer mode. On success set the corresponding
* bus width on the host.
*/
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BUS_WIDTH,
ext_csd_bits[idx],
card->ext_csd.generic_cmd6_time);
if (err)
continue;
bus_width = bus_widths[idx];
mmc_set_bus_width(host, bus_width);
/*
* If controller can't handle bus width test,
* compare ext_csd previously read in 1 bit mode
* against ext_csd at new bus width
*/
if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
err = mmc_compare_ext_csds(card, bus_width);
else
err = mmc_bus_test(card, bus_width);
if (!err) {
err = bus_width;
break;
} else {
pr_warn("%s: switch to bus width %d failed\n",
mmc_hostname(host), ext_csd_bits[idx]);
}
}
return err;
}
/*
* Switch to the high-speed mode
*/
static int mmc_select_hs(struct mmc_card *card)
{
int err;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
card->ext_csd.generic_cmd6_time,
true, true, true);
if (!err)
mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
return err;
}
/*
* Activate wide bus and DDR if supported.
*/
static int mmc_select_hs_ddr(struct mmc_card *card)
{
struct mmc_host *host = card->host;
u32 bus_width, ext_csd_bits;
int err = 0;
if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
return 0;
bus_width = host->ios.bus_width;
if (bus_width == MMC_BUS_WIDTH_1)
return 0;
ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BUS_WIDTH,
ext_csd_bits,
card->ext_csd.generic_cmd6_time);
if (err) {
pr_warn("%s: switch to bus width %d ddr failed\n",
mmc_hostname(host), 1 << bus_width);
return err;
}
/*
* eMMC cards can support 3.3V to 1.2V i/o (vccq)
* signaling.
*
* EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
*
* 1.8V vccq at 3.3V core voltage (vcc) is not required
* in the JEDEC spec for DDR.
*
* Do not force change in vccq since we are obviously
* working and no change to vccq is needed.
*
* WARNING: eMMC rules are NOT the same as SD DDR
*/
if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
err = __mmc_set_signal_voltage(host,
MMC_SIGNAL_VOLTAGE_120);
if (err)
return err;
}
mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
return err;
}
static int mmc_select_hs400(struct mmc_card *card)
{
struct mmc_host *host = card->host;
int err = 0;
/*
* HS400 mode requires 8-bit bus width
*/
if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
host->ios.bus_width == MMC_BUS_WIDTH_8))
return 0;
/*
* Before switching to dual data rate operation for HS400,
* it is required to convert from HS200 mode to HS mode.
*/
mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
mmc_set_bus_speed(card);
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
card->ext_csd.generic_cmd6_time,
true, true, true);
if (err) {
pr_warn("%s: switch to high-speed from hs200 failed, err:%d\n",
mmc_hostname(host), err);
return err;
}
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BUS_WIDTH,
EXT_CSD_DDR_BUS_WIDTH_8,
card->ext_csd.generic_cmd6_time);
if (err) {
pr_warn("%s: switch to bus width for hs400 failed, err:%d\n",
mmc_hostname(host), err);
return err;
}
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS400,
card->ext_csd.generic_cmd6_time,
true, true, true);
if (err) {
pr_warn("%s: switch to hs400 failed, err:%d\n",
mmc_hostname(host), err);
return err;
}
mmc_set_timing(host, MMC_TIMING_MMC_HS400);
mmc_set_bus_speed(card);
return 0;
}
/*
* For device supporting HS200 mode, the following sequence
* should be done before executing the tuning process.
* 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
* 2. switch to HS200 mode
* 3. set the clock to > 52Mhz and <=200MHz
*/
static int mmc_select_hs200(struct mmc_card *card)
{
struct mmc_host *host = card->host;
int err = -EINVAL;
if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
/* If fails try again during next card power cycle */
if (err)
goto err;
/*
* Set the bus width(4 or 8) with host's support and
* switch to HS200 mode if bus width is set successfully.
*/
err = mmc_select_bus_width(card);
if (!IS_ERR_VALUE(err)) {
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS200,
card->ext_csd.generic_cmd6_time,
true, true, true);
if (!err)
mmc_set_timing(host, MMC_TIMING_MMC_HS200);
}
err:
return err;
}
/*
* Activate High Speed or HS200 mode if supported.
*/
static int mmc_select_timing(struct mmc_card *card)
{
int err = 0;
if ((card->csd.mmca_vsn < CSD_SPEC_VER_4 &&
card->ext_csd.hs_max_dtr == 0))
goto bus_speed;
if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
err = mmc_select_hs200(card);
else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
err = mmc_select_hs(card);
if (err && err != -EBADMSG)
return err;
if (err) {
pr_warn("%s: switch to %s failed\n",
mmc_card_hs(card) ? "high-speed" :
(mmc_card_hs200(card) ? "hs200" : ""),
mmc_hostname(card->host));
err = 0;
}
bus_speed:
/*
* Set the bus speed to the selected bus timing.
* If timing is not selected, backward compatible is the default.
*/
mmc_set_bus_speed(card);
return err;
}
/*
* Execute tuning sequence to seek the proper bus operating
* conditions for HS200 and HS400, which sends CMD21 to the device.
*/
static int mmc_hs200_tuning(struct mmc_card *card)
{
struct mmc_host *host = card->host;
int err = 0;
/*
* Timing should be adjusted to the HS400 target
* operation frequency for tuning process
*/
if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
host->ios.bus_width == MMC_BUS_WIDTH_8)
if (host->ops->prepare_hs400_tuning)
host->ops->prepare_hs400_tuning(host, &host->ios);
if (host->ops->execute_tuning) {
mmc_host_clk_hold(host);
err = host->ops->execute_tuning(host,
MMC_SEND_TUNING_BLOCK_HS200);
mmc_host_clk_release(host);
if (err)
pr_warn("%s: tuning execution failed\n",
mmc_hostname(host));
}
return err;
}
/*
* 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];
u32 rocr;
u8 *ext_csd = NULL;
BUG_ON(!host);
WARN_ON(!host->claimed);
/* Set correct bus mode for MMC before attempting init */
if (!mmc_host_is_spi(host))
mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
/*
* 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 is needed for eMMC that are asleep
*/
mmc_go_idle(host);
/* The extra bit indicates that we support high capacity */
err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
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->ocr = ocr;
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;
}
/*
* handling only for cards supporting DSR and hosts requesting
* DSR configuration
*/
if (card->csd.dsr_imp && host->dsr_req)
mmc_set_dsr(host);
/*
* Select card, as all following commands rely on that.
*/
if (!mmc_host_is_spi(host)) {
err = mmc_select_card(card);
if (err)
goto free_card;
}
if (!oldcard) {
/*
* Fetch and process extended CSD.
*/
err = mmc_get_ext_csd(card, &ext_csd);
if (err)
goto free_card;
err = mmc_read_ext_csd(card, ext_csd);
if (err)
goto free_card;
/* If doing byte addressing, check if required to do sector
* addressing. Handle the case of <2GB cards needing sector
* addressing. See section 8.1 JEDEC Standard JED84-A441;
* ocr register has bit 30 set for sector addressing.
*/
if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
mmc_card_set_blockaddr(card);
/* Erase size depends on CSD and Extended CSD */
mmc_set_erase_size(card);
}
/*
* If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
* bit. This bit will be lost every time after a reset or power off.
*/
if (card->ext_csd.enhanced_area_en ||
(card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_ERASE_GROUP_DEF, 1,
card->ext_csd.generic_cmd6_time);
if (err && err != -EBADMSG)
goto free_card;
if (err) {
err = 0;
/*
* Just disable enhanced area off & sz
* will try to enable ERASE_GROUP_DEF
* during next time reinit
*/
card->ext_csd.enhanced_area_offset = -EINVAL;
card->ext_csd.enhanced_area_size = -EINVAL;
} else {
card->ext_csd.erase_group_def = 1;
/*
* enable ERASE_GRP_DEF successfully.
* This will affect the erase size, so
* here need to reset erase size
*/
mmc_set_erase_size(card);
}
}
/*
* Ensure eMMC user default partition is enabled
*/
if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
card->ext_csd.part_config,
card->ext_csd.part_time);
if (err && err != -EBADMSG)
goto free_card;
}
/*
* Enable power_off_notification byte in the ext_csd register
*/
if (card->ext_csd.rev >= 6) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_POWER_OFF_NOTIFICATION,
EXT_CSD_POWER_ON,
card->ext_csd.generic_cmd6_time);
if (err && err != -EBADMSG)
goto free_card;
/*
* The err can be -EBADMSG or 0,
* so check for success and update the flag
*/
if (!err)
card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
}
/*
* Select timing interface
*/
err = mmc_select_timing(card);
if (err)
goto free_card;
if (mmc_card_hs200(card)) {
err = mmc_hs200_tuning(card);
if (err)
goto err;
err = mmc_select_hs400(card);
if (err)
goto err;
} else if (mmc_card_hs(card)) {
/* Select the desired bus width optionally */
err = mmc_select_bus_width(card);
if (!IS_ERR_VALUE(err)) {
err = mmc_select_hs_ddr(card);
if (err)
goto err;
}
}
/*
* Choose the power class with selected bus interface
*/
mmc_select_powerclass(card);
/*
* Enable HPI feature (if supported)
*/
if (card->ext_csd.hpi) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HPI_MGMT, 1,
card->ext_csd.generic_cmd6_time);
if (err && err != -EBADMSG)
goto free_card;
if (err) {
pr_warning("%s: Enabling HPI failed\n",
mmc_hostname(card->host));
err = 0;
} else
card->ext_csd.hpi_en = 1;
}
/*
* If cache size is higher than 0, this indicates
* the existence of cache and it can be turned on.
*/
if (card->ext_csd.cache_size > 0) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_CACHE_CTRL, 1,
card->ext_csd.generic_cmd6_time);
if (err && err != -EBADMSG)
goto free_card;
/*
* Only if no error, cache is turned on successfully.
*/
if (err) {
pr_warning("%s: Cache is supported, "
"but failed to turn on (%d)\n",
mmc_hostname(card->host), err);
card->ext_csd.cache_ctrl = 0;
err = 0;
} else {
card->ext_csd.cache_ctrl = 1;
}
}
/*
* The mandatory minimum values are defined for packed command.
* read: 5, write: 3
*/
if (card->ext_csd.max_packed_writes >= 3 &&
card->ext_csd.max_packed_reads >= 5 &&
host->caps2 & MMC_CAP2_PACKED_CMD) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_EXP_EVENTS_CTRL,
EXT_CSD_PACKED_EVENT_EN,
card->ext_csd.generic_cmd6_time);
if (err && err != -EBADMSG)
goto free_card;
if (err) {
pr_warn("%s: Enabling packed event failed\n",
mmc_hostname(card->host));
card->ext_csd.packed_event_en = 0;
err = 0;
} else {
card->ext_csd.packed_event_en = 1;
}
}
if (!oldcard)
host->card = card;
mmc_free_ext_csd(ext_csd);
return 0;
free_card:
if (!oldcard)
mmc_remove_card(card);
err:
mmc_free_ext_csd(ext_csd);
return err;
}
static int mmc_can_sleep(struct mmc_card *card)
{
return (card && card->ext_csd.rev >= 3);
}
static int mmc_sleep(struct mmc_host *host)
{
struct mmc_command cmd = {0};
struct mmc_card *card = host->card;
unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
int err;
err = mmc_deselect_cards(host);
if (err)
return err;
cmd.opcode = MMC_SLEEP_AWAKE;
cmd.arg = card->rca << 16;
cmd.arg |= 1 << 15;
/*
* If the max_busy_timeout of the host is specified, validate it against
* the sleep cmd timeout. A failure means we need to prevent the host
* from doing hw busy detection, which is done by converting to a R1
* response instead of a R1B.
*/
if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
} else {
cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
cmd.busy_timeout = timeout_ms;
}
err = mmc_wait_for_cmd(host, &cmd, 0);
if (err)
return err;
/*
* If the host does not wait while the card signals busy, then we will
* will have to wait the sleep/awake timeout. Note, we cannot use the
* SEND_STATUS command to poll the status because that command (and most
* others) is invalid while the card sleeps.
*/
if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
mmc_delay(timeout_ms);
return err;
}
static int mmc_can_poweroff_notify(const struct mmc_card *card)
{
return card &&
mmc_card_mmc(card) &&
(card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
}
static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
{
unsigned int timeout = card->ext_csd.generic_cmd6_time;
int err;
/* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
if (notify_type == EXT_CSD_POWER_OFF_LONG)
timeout = card->ext_csd.power_off_longtime;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_POWER_OFF_NOTIFICATION,
notify_type, timeout, true, false, false);
if (err)
pr_err("%s: Power Off Notification timed out, %u\n",
mmc_hostname(card->host), timeout);
/* Disable the power off notification after the switch operation. */
card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
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 - card is alive.
*/
static int mmc_alive(struct mmc_host *host)
{
return mmc_send_status(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_get_card(host->card);
/*
* Just check if our card has been removed.
*/
err = _mmc_detect_card_removed(host);
mmc_put_card(host->card);
if (err) {
mmc_remove(host);
mmc_claim_host(host);
mmc_detach_bus(host);
mmc_power_off(host);
mmc_release_host(host);
}
}
static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
{
int err = 0;
unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
EXT_CSD_POWER_OFF_LONG;
BUG_ON(!host);
BUG_ON(!host->card);
mmc_claim_host(host);
if (mmc_card_suspended(host->card))
goto out;
if (mmc_card_doing_bkops(host->card)) {
err = mmc_stop_bkops(host->card);
if (err)
goto out;
}
err = mmc_flush_cache(host->card);
if (err)
goto out;
if (mmc_can_poweroff_notify(host->card) &&
((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
err = mmc_poweroff_notify(host->card, notify_type);
else if (mmc_can_sleep(host->card))
err = mmc_sleep(host);
else if (!mmc_host_is_spi(host))
err = mmc_deselect_cards(host);
if (!err) {
mmc_power_off(host);
mmc_card_set_suspended(host->card);
}
out:
mmc_release_host(host);
return err;
}
/*
* Suspend callback
*/
static int mmc_suspend(struct mmc_host *host)
{
int err;
err = _mmc_suspend(host, true);
if (!err) {
pm_runtime_disable(&host->card->dev);
pm_runtime_set_suspended(&host->card->dev);
}
return err;
}
/*
* This function tries to determine if the same card is still present
* and, if so, restore all state to it.
*/
static int _mmc_resume(struct mmc_host *host)
{
int err = 0;
BUG_ON(!host);
BUG_ON(!host->card);
mmc_claim_host(host);
if (!mmc_card_suspended(host->card))
goto out;
mmc_power_up(host, host->card->ocr);
err = mmc_init_card(host, host->card->ocr, host->card);
mmc_card_clr_suspended(host->card);
out:
mmc_release_host(host);
return err;
}
/*
* Shutdown callback
*/
static int mmc_shutdown(struct mmc_host *host)
{
int err = 0;
/*
* In a specific case for poweroff notify, we need to resume the card
* before we can shutdown it properly.
*/
if (mmc_can_poweroff_notify(host->card) &&
!(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
err = _mmc_resume(host);
if (!err)
err = _mmc_suspend(host, false);
return err;
}
/*
* Callback for resume.
*/
static int mmc_resume(struct mmc_host *host)
{
int err = 0;
if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
err = _mmc_resume(host);
pm_runtime_set_active(&host->card->dev);
pm_runtime_mark_last_busy(&host->card->dev);
}
pm_runtime_enable(&host->card->dev);
return err;
}
/*
* Callback for runtime_suspend.
*/
static int mmc_runtime_suspend(struct mmc_host *host)
{
int err;
if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
return 0;
err = _mmc_suspend(host, true);
if (err)
pr_err("%s: error %d doing aggessive suspend\n",
mmc_hostname(host), err);
return err;
}
/*
* Callback for runtime_resume.
*/
static int mmc_runtime_resume(struct mmc_host *host)
{
int err;
if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
return 0;
err = _mmc_resume(host);
if (err)
pr_err("%s: error %d doing aggessive resume\n",
mmc_hostname(host), err);
return 0;
}
static int mmc_power_restore(struct mmc_host *host)
{
int ret;
mmc_claim_host(host);
ret = mmc_init_card(host, host->card->ocr, host->card);
mmc_release_host(host);
return ret;
}
static const struct mmc_bus_ops mmc_ops = {
.remove = mmc_remove,
.detect = mmc_detect,
.suspend = mmc_suspend,
.resume = mmc_resume,
.runtime_suspend = mmc_runtime_suspend,
.runtime_resume = mmc_runtime_resume,
.power_restore = mmc_power_restore,
.alive = mmc_alive,
.shutdown = mmc_shutdown,
};
/*
* Starting point for MMC card init.
*/
int mmc_attach_mmc(struct mmc_host *host)
{
int err;
u32 ocr, rocr;
BUG_ON(!host);
WARN_ON(!host->claimed);
/* Set correct bus mode for MMC before attempting attach */
if (!mmc_host_is_spi(host))
mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
err = mmc_send_op_cond(host, 0, &ocr);
if (err)
return err;
mmc_attach_bus(host, &mmc_ops);
if (host->ocr_avail_mmc)
host->ocr_avail = host->ocr_avail_mmc;
/*
* 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;
}
rocr = mmc_select_voltage(host, ocr);
/*
* Can we support the voltage of the card?
*/
if (!rocr) {
err = -EINVAL;
goto err;
}
/*
* Detect and init the card.
*/
err = mmc_init_card(host, rocr, NULL);
if (err)
goto err;
mmc_release_host(host);
err = mmc_add_card(host->card);
mmc_claim_host(host);
if (err)
goto remove_card;
return 0;
remove_card:
mmc_release_host(host);
mmc_remove_card(host->card);
mmc_claim_host(host);
host->card = NULL;
err:
mmc_detach_bus(host);
pr_err("%s: error %d whilst initialising MMC card\n",
mmc_hostname(host), err);
return err;
}
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