mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Zhen Lei](/assets/img/avatar_default.png)
Let's use pr_err() to output the error messages and let's extend a comment
to clarify why returning 0 (success) in one case make sense.
Fixes: c784f92769
("mmc: core: Read the SD function extension registers for power management")
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
[Ulf: Clarified the comment and the commit-msg]
Link: https://lore.kernel.org/r/20221130134920.2109-1-thunder.leizhen@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
1881 lines
44 KiB
C
1881 lines
44 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* linux/drivers/mmc/core/sd.c
|
|
*
|
|
* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
|
|
* SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
|
|
* Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/sizes.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/random.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/sysfs.h>
|
|
|
|
#include <linux/mmc/host.h>
|
|
#include <linux/mmc/card.h>
|
|
#include <linux/mmc/mmc.h>
|
|
#include <linux/mmc/sd.h>
|
|
|
|
#include "core.h"
|
|
#include "card.h"
|
|
#include "host.h"
|
|
#include "bus.h"
|
|
#include "mmc_ops.h"
|
|
#include "sd.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 taac_exp[] = {
|
|
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
|
|
};
|
|
|
|
static const unsigned int taac_mant[] = {
|
|
0, 10, 12, 13, 15, 20, 25, 30,
|
|
35, 40, 45, 50, 55, 60, 70, 80,
|
|
};
|
|
|
|
static const unsigned int sd_au_size[] = {
|
|
0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
|
|
SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
|
|
SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
|
|
SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
|
|
};
|
|
|
|
#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; \
|
|
})
|
|
|
|
#define SD_POWEROFF_NOTIFY_TIMEOUT_MS 1000
|
|
#define SD_WRITE_EXTR_SINGLE_TIMEOUT_MS 1000
|
|
|
|
struct sd_busy_data {
|
|
struct mmc_card *card;
|
|
u8 *reg_buf;
|
|
};
|
|
|
|
/*
|
|
* Given the decoded CSD structure, decode the raw CID to our CID structure.
|
|
*/
|
|
void mmc_decode_cid(struct mmc_card *card)
|
|
{
|
|
u32 *resp = card->raw_cid;
|
|
|
|
/*
|
|
* Add the raw card ID (cid) data to the entropy pool. It doesn't
|
|
* matter that not all of it is unique, it's just bonus entropy.
|
|
*/
|
|
add_device_randomness(&card->raw_cid, sizeof(card->raw_cid));
|
|
|
|
/*
|
|
* SD doesn't currently have a version field so we will
|
|
* have to assume we can parse this.
|
|
*/
|
|
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.hwrev = UNSTUFF_BITS(resp, 60, 4);
|
|
card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
|
|
card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
|
|
card->cid.year = UNSTUFF_BITS(resp, 12, 8);
|
|
card->cid.month = UNSTUFF_BITS(resp, 8, 4);
|
|
|
|
card->cid.year += 2000; /* SD cards year offset */
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
csd_struct = UNSTUFF_BITS(resp, 126, 2);
|
|
|
|
switch (csd_struct) {
|
|
case 0:
|
|
m = UNSTUFF_BITS(resp, 115, 4);
|
|
e = UNSTUFF_BITS(resp, 112, 3);
|
|
csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10;
|
|
csd->taac_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 (UNSTUFF_BITS(resp, 46, 1)) {
|
|
csd->erase_size = 1;
|
|
} else if (csd->write_blkbits >= 9) {
|
|
csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
|
|
csd->erase_size <<= csd->write_blkbits - 9;
|
|
}
|
|
|
|
if (UNSTUFF_BITS(resp, 13, 1))
|
|
mmc_card_set_readonly(card);
|
|
break;
|
|
case 1:
|
|
/*
|
|
* This is a block-addressed SDHC or SDXC card. Most
|
|
* interesting fields are unused and have fixed
|
|
* values. To avoid getting tripped by buggy cards,
|
|
* we assume those fixed values ourselves.
|
|
*/
|
|
mmc_card_set_blockaddr(card);
|
|
|
|
csd->taac_ns = 0; /* Unused */
|
|
csd->taac_clks = 0; /* Unused */
|
|
|
|
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);
|
|
csd->c_size = UNSTUFF_BITS(resp, 48, 22);
|
|
|
|
/* SDXC cards have a minimum C_SIZE of 0x00FFFF */
|
|
if (csd->c_size >= 0xFFFF)
|
|
mmc_card_set_ext_capacity(card);
|
|
|
|
m = UNSTUFF_BITS(resp, 48, 22);
|
|
csd->capacity = (1 + m) << 10;
|
|
|
|
csd->read_blkbits = 9;
|
|
csd->read_partial = 0;
|
|
csd->write_misalign = 0;
|
|
csd->read_misalign = 0;
|
|
csd->r2w_factor = 4; /* Unused */
|
|
csd->write_blkbits = 9;
|
|
csd->write_partial = 0;
|
|
csd->erase_size = 1;
|
|
|
|
if (UNSTUFF_BITS(resp, 13, 1))
|
|
mmc_card_set_readonly(card);
|
|
break;
|
|
default:
|
|
pr_err("%s: unrecognised CSD structure version %d\n",
|
|
mmc_hostname(card->host), csd_struct);
|
|
return -EINVAL;
|
|
}
|
|
|
|
card->erase_size = csd->erase_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Given a 64-bit response, decode to our card SCR structure.
|
|
*/
|
|
static int mmc_decode_scr(struct mmc_card *card)
|
|
{
|
|
struct sd_scr *scr = &card->scr;
|
|
unsigned int scr_struct;
|
|
u32 resp[4];
|
|
|
|
resp[3] = card->raw_scr[1];
|
|
resp[2] = card->raw_scr[0];
|
|
|
|
scr_struct = UNSTUFF_BITS(resp, 60, 4);
|
|
if (scr_struct != 0) {
|
|
pr_err("%s: unrecognised SCR structure version %d\n",
|
|
mmc_hostname(card->host), scr_struct);
|
|
return -EINVAL;
|
|
}
|
|
|
|
scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
|
|
scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
|
|
if (scr->sda_vsn == SCR_SPEC_VER_2)
|
|
/* Check if Physical Layer Spec v3.0 is supported */
|
|
scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
|
|
|
|
if (scr->sda_spec3) {
|
|
scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1);
|
|
scr->sda_specx = UNSTUFF_BITS(resp, 38, 4);
|
|
}
|
|
|
|
if (UNSTUFF_BITS(resp, 55, 1))
|
|
card->erased_byte = 0xFF;
|
|
else
|
|
card->erased_byte = 0x0;
|
|
|
|
if (scr->sda_spec4)
|
|
scr->cmds = UNSTUFF_BITS(resp, 32, 4);
|
|
else if (scr->sda_spec3)
|
|
scr->cmds = UNSTUFF_BITS(resp, 32, 2);
|
|
|
|
/* SD Spec says: any SD Card shall set at least bits 0 and 2 */
|
|
if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
|
|
!(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
|
|
pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Fetch and process SD Status register.
|
|
*/
|
|
static int mmc_read_ssr(struct mmc_card *card)
|
|
{
|
|
unsigned int au, es, et, eo;
|
|
__be32 *raw_ssr;
|
|
u32 resp[4] = {};
|
|
u8 discard_support;
|
|
int i;
|
|
|
|
if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
|
|
pr_warn("%s: card lacks mandatory SD Status function\n",
|
|
mmc_hostname(card->host));
|
|
return 0;
|
|
}
|
|
|
|
raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
|
|
if (!raw_ssr)
|
|
return -ENOMEM;
|
|
|
|
if (mmc_app_sd_status(card, raw_ssr)) {
|
|
pr_warn("%s: problem reading SD Status register\n",
|
|
mmc_hostname(card->host));
|
|
kfree(raw_ssr);
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < 16; i++)
|
|
card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
|
|
|
|
kfree(raw_ssr);
|
|
|
|
/*
|
|
* UNSTUFF_BITS only works with four u32s so we have to offset the
|
|
* bitfield positions accordingly.
|
|
*/
|
|
au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
|
|
if (au) {
|
|
if (au <= 9 || card->scr.sda_spec3) {
|
|
card->ssr.au = sd_au_size[au];
|
|
es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
|
|
et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
|
|
if (es && et) {
|
|
eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
|
|
card->ssr.erase_timeout = (et * 1000) / es;
|
|
card->ssr.erase_offset = eo * 1000;
|
|
}
|
|
} else {
|
|
pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
|
|
mmc_hostname(card->host));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set
|
|
*/
|
|
resp[3] = card->raw_ssr[6];
|
|
discard_support = UNSTUFF_BITS(resp, 313 - 288, 1);
|
|
card->erase_arg = (card->scr.sda_specx && discard_support) ?
|
|
SD_DISCARD_ARG : SD_ERASE_ARG;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Fetches and decodes switch information
|
|
*/
|
|
static int mmc_read_switch(struct mmc_card *card)
|
|
{
|
|
int err;
|
|
u8 *status;
|
|
|
|
if (card->scr.sda_vsn < SCR_SPEC_VER_1)
|
|
return 0;
|
|
|
|
if (!(card->csd.cmdclass & CCC_SWITCH)) {
|
|
pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
|
|
mmc_hostname(card->host));
|
|
return 0;
|
|
}
|
|
|
|
status = kmalloc(64, GFP_KERNEL);
|
|
if (!status)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Find out the card's support bits with a mode 0 operation.
|
|
* The argument does not matter, as the support bits do not
|
|
* change with the arguments.
|
|
*/
|
|
err = mmc_sd_switch(card, 0, 0, 0, status);
|
|
if (err) {
|
|
/*
|
|
* If the host or the card can't do the switch,
|
|
* fail more gracefully.
|
|
*/
|
|
if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
|
|
goto out;
|
|
|
|
pr_warn("%s: problem reading Bus Speed modes\n",
|
|
mmc_hostname(card->host));
|
|
err = 0;
|
|
|
|
goto out;
|
|
}
|
|
|
|
if (status[13] & SD_MODE_HIGH_SPEED)
|
|
card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
|
|
|
|
if (card->scr.sda_spec3) {
|
|
card->sw_caps.sd3_bus_mode = status[13];
|
|
/* Driver Strengths supported by the card */
|
|
card->sw_caps.sd3_drv_type = status[9];
|
|
card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
|
|
}
|
|
|
|
out:
|
|
kfree(status);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Test if the card supports high-speed mode and, if so, switch to it.
|
|
*/
|
|
int mmc_sd_switch_hs(struct mmc_card *card)
|
|
{
|
|
int err;
|
|
u8 *status;
|
|
|
|
if (card->scr.sda_vsn < SCR_SPEC_VER_1)
|
|
return 0;
|
|
|
|
if (!(card->csd.cmdclass & CCC_SWITCH))
|
|
return 0;
|
|
|
|
if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
|
|
return 0;
|
|
|
|
if (card->sw_caps.hs_max_dtr == 0)
|
|
return 0;
|
|
|
|
status = kmalloc(64, GFP_KERNEL);
|
|
if (!status)
|
|
return -ENOMEM;
|
|
|
|
err = mmc_sd_switch(card, 1, 0, HIGH_SPEED_BUS_SPEED, status);
|
|
if (err)
|
|
goto out;
|
|
|
|
if ((status[16] & 0xF) != HIGH_SPEED_BUS_SPEED) {
|
|
pr_warn("%s: Problem switching card into high-speed mode!\n",
|
|
mmc_hostname(card->host));
|
|
err = 0;
|
|
} else {
|
|
err = 1;
|
|
}
|
|
|
|
out:
|
|
kfree(status);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int sd_select_driver_type(struct mmc_card *card, u8 *status)
|
|
{
|
|
int card_drv_type, drive_strength, drv_type;
|
|
int err;
|
|
|
|
card->drive_strength = 0;
|
|
|
|
card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
|
|
|
|
drive_strength = mmc_select_drive_strength(card,
|
|
card->sw_caps.uhs_max_dtr,
|
|
card_drv_type, &drv_type);
|
|
|
|
if (drive_strength) {
|
|
err = mmc_sd_switch(card, 1, 2, drive_strength, status);
|
|
if (err)
|
|
return err;
|
|
if ((status[15] & 0xF) != drive_strength) {
|
|
pr_warn("%s: Problem setting drive strength!\n",
|
|
mmc_hostname(card->host));
|
|
return 0;
|
|
}
|
|
card->drive_strength = drive_strength;
|
|
}
|
|
|
|
if (drv_type)
|
|
mmc_set_driver_type(card->host, drv_type);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sd_update_bus_speed_mode(struct mmc_card *card)
|
|
{
|
|
/*
|
|
* If the host doesn't support any of the UHS-I modes, fallback on
|
|
* default speed.
|
|
*/
|
|
if (!mmc_host_uhs(card->host)) {
|
|
card->sd_bus_speed = 0;
|
|
return;
|
|
}
|
|
|
|
if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
|
|
(card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
|
|
card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
|
|
} else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
|
|
(card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
|
|
card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
|
|
} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
|
|
MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
|
|
SD_MODE_UHS_SDR50)) {
|
|
card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
|
|
} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
|
|
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
|
|
(card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
|
|
card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
|
|
} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
|
|
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
|
|
MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
|
|
SD_MODE_UHS_SDR12)) {
|
|
card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
|
|
}
|
|
}
|
|
|
|
static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
|
|
{
|
|
int err;
|
|
unsigned int timing = 0;
|
|
|
|
switch (card->sd_bus_speed) {
|
|
case UHS_SDR104_BUS_SPEED:
|
|
timing = MMC_TIMING_UHS_SDR104;
|
|
card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
|
|
break;
|
|
case UHS_DDR50_BUS_SPEED:
|
|
timing = MMC_TIMING_UHS_DDR50;
|
|
card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
|
|
break;
|
|
case UHS_SDR50_BUS_SPEED:
|
|
timing = MMC_TIMING_UHS_SDR50;
|
|
card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
|
|
break;
|
|
case UHS_SDR25_BUS_SPEED:
|
|
timing = MMC_TIMING_UHS_SDR25;
|
|
card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
|
|
break;
|
|
case UHS_SDR12_BUS_SPEED:
|
|
timing = MMC_TIMING_UHS_SDR12;
|
|
card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
|
|
if (err)
|
|
return err;
|
|
|
|
if ((status[16] & 0xF) != card->sd_bus_speed)
|
|
pr_warn("%s: Problem setting bus speed mode!\n",
|
|
mmc_hostname(card->host));
|
|
else {
|
|
mmc_set_timing(card->host, timing);
|
|
mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Get host's max current setting at its current voltage */
|
|
static u32 sd_get_host_max_current(struct mmc_host *host)
|
|
{
|
|
u32 voltage, max_current;
|
|
|
|
voltage = 1 << host->ios.vdd;
|
|
switch (voltage) {
|
|
case MMC_VDD_165_195:
|
|
max_current = host->max_current_180;
|
|
break;
|
|
case MMC_VDD_29_30:
|
|
case MMC_VDD_30_31:
|
|
max_current = host->max_current_300;
|
|
break;
|
|
case MMC_VDD_32_33:
|
|
case MMC_VDD_33_34:
|
|
max_current = host->max_current_330;
|
|
break;
|
|
default:
|
|
max_current = 0;
|
|
}
|
|
|
|
return max_current;
|
|
}
|
|
|
|
static int sd_set_current_limit(struct mmc_card *card, u8 *status)
|
|
{
|
|
int current_limit = SD_SET_CURRENT_NO_CHANGE;
|
|
int err;
|
|
u32 max_current;
|
|
|
|
/*
|
|
* Current limit switch is only defined for SDR50, SDR104, and DDR50
|
|
* bus speed modes. For other bus speed modes, we do not change the
|
|
* current limit.
|
|
*/
|
|
if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
|
|
(card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
|
|
(card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
|
|
return 0;
|
|
|
|
/*
|
|
* Host has different current capabilities when operating at
|
|
* different voltages, so find out its max current first.
|
|
*/
|
|
max_current = sd_get_host_max_current(card->host);
|
|
|
|
/*
|
|
* We only check host's capability here, if we set a limit that is
|
|
* higher than the card's maximum current, the card will be using its
|
|
* maximum current, e.g. if the card's maximum current is 300ma, and
|
|
* when we set current limit to 200ma, the card will draw 200ma, and
|
|
* when we set current limit to 400/600/800ma, the card will draw its
|
|
* maximum 300ma from the host.
|
|
*
|
|
* The above is incorrect: if we try to set a current limit that is
|
|
* not supported by the card, the card can rightfully error out the
|
|
* attempt, and remain at the default current limit. This results
|
|
* in a 300mA card being limited to 200mA even though the host
|
|
* supports 800mA. Failures seen with SanDisk 8GB UHS cards with
|
|
* an iMX6 host. --rmk
|
|
*/
|
|
if (max_current >= 800 &&
|
|
card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
|
|
current_limit = SD_SET_CURRENT_LIMIT_800;
|
|
else if (max_current >= 600 &&
|
|
card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
|
|
current_limit = SD_SET_CURRENT_LIMIT_600;
|
|
else if (max_current >= 400 &&
|
|
card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
|
|
current_limit = SD_SET_CURRENT_LIMIT_400;
|
|
else if (max_current >= 200 &&
|
|
card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
|
|
current_limit = SD_SET_CURRENT_LIMIT_200;
|
|
|
|
if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
|
|
err = mmc_sd_switch(card, 1, 3, current_limit, status);
|
|
if (err)
|
|
return err;
|
|
|
|
if (((status[15] >> 4) & 0x0F) != current_limit)
|
|
pr_warn("%s: Problem setting current limit!\n",
|
|
mmc_hostname(card->host));
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* UHS-I specific initialization procedure
|
|
*/
|
|
static int mmc_sd_init_uhs_card(struct mmc_card *card)
|
|
{
|
|
int err;
|
|
u8 *status;
|
|
|
|
if (!(card->csd.cmdclass & CCC_SWITCH))
|
|
return 0;
|
|
|
|
status = kmalloc(64, GFP_KERNEL);
|
|
if (!status)
|
|
return -ENOMEM;
|
|
|
|
/* Set 4-bit bus width */
|
|
err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
|
|
if (err)
|
|
goto out;
|
|
|
|
mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
|
|
|
|
/*
|
|
* Select the bus speed mode depending on host
|
|
* and card capability.
|
|
*/
|
|
sd_update_bus_speed_mode(card);
|
|
|
|
/* Set the driver strength for the card */
|
|
err = sd_select_driver_type(card, status);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Set current limit for the card */
|
|
err = sd_set_current_limit(card, status);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Set bus speed mode of the card */
|
|
err = sd_set_bus_speed_mode(card, status);
|
|
if (err)
|
|
goto out;
|
|
|
|
/*
|
|
* SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
|
|
* SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
|
|
*/
|
|
if (!mmc_host_is_spi(card->host) &&
|
|
(card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
|
|
card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
|
|
card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
|
|
err = mmc_execute_tuning(card);
|
|
|
|
/*
|
|
* As SD Specifications Part1 Physical Layer Specification
|
|
* Version 3.01 says, CMD19 tuning is available for unlocked
|
|
* cards in transfer state of 1.8V signaling mode. The small
|
|
* difference between v3.00 and 3.01 spec means that CMD19
|
|
* tuning is also available for DDR50 mode.
|
|
*/
|
|
if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
|
|
pr_warn("%s: ddr50 tuning failed\n",
|
|
mmc_hostname(card->host));
|
|
err = 0;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(status);
|
|
|
|
return err;
|
|
}
|
|
|
|
MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
|
|
card->raw_cid[2], card->raw_cid[3]);
|
|
MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
|
|
card->raw_csd[2], card->raw_csd[3]);
|
|
MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
|
|
MMC_DEV_ATTR(ssr,
|
|
"%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
|
|
card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
|
|
card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
|
|
card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
|
|
card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
|
|
card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
|
|
card->raw_ssr[15]);
|
|
MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
|
|
MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
|
|
MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
|
|
MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
|
|
MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
|
|
MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
|
|
MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
|
|
MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
|
|
MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
|
|
MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
|
|
MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
|
|
|
|
|
|
static ssize_t mmc_dsr_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct mmc_card *card = mmc_dev_to_card(dev);
|
|
struct mmc_host *host = card->host;
|
|
|
|
if (card->csd.dsr_imp && host->dsr_req)
|
|
return sysfs_emit(buf, "0x%x\n", host->dsr);
|
|
/* return default DSR value */
|
|
return sysfs_emit(buf, "0x%x\n", 0x404);
|
|
}
|
|
|
|
static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
|
|
|
|
MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
|
|
MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
|
|
MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev);
|
|
|
|
#define sdio_info_attr(num) \
|
|
static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct mmc_card *card = mmc_dev_to_card(dev); \
|
|
\
|
|
if (num > card->num_info) \
|
|
return -ENODATA; \
|
|
if (!card->info[num - 1][0]) \
|
|
return 0; \
|
|
return sysfs_emit(buf, "%s\n", card->info[num - 1]); \
|
|
} \
|
|
static DEVICE_ATTR_RO(info##num)
|
|
|
|
sdio_info_attr(1);
|
|
sdio_info_attr(2);
|
|
sdio_info_attr(3);
|
|
sdio_info_attr(4);
|
|
|
|
static struct attribute *sd_std_attrs[] = {
|
|
&dev_attr_vendor.attr,
|
|
&dev_attr_device.attr,
|
|
&dev_attr_revision.attr,
|
|
&dev_attr_info1.attr,
|
|
&dev_attr_info2.attr,
|
|
&dev_attr_info3.attr,
|
|
&dev_attr_info4.attr,
|
|
&dev_attr_cid.attr,
|
|
&dev_attr_csd.attr,
|
|
&dev_attr_scr.attr,
|
|
&dev_attr_ssr.attr,
|
|
&dev_attr_date.attr,
|
|
&dev_attr_erase_size.attr,
|
|
&dev_attr_preferred_erase_size.attr,
|
|
&dev_attr_fwrev.attr,
|
|
&dev_attr_hwrev.attr,
|
|
&dev_attr_manfid.attr,
|
|
&dev_attr_name.attr,
|
|
&dev_attr_oemid.attr,
|
|
&dev_attr_serial.attr,
|
|
&dev_attr_ocr.attr,
|
|
&dev_attr_rca.attr,
|
|
&dev_attr_dsr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr,
|
|
int index)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
struct mmc_card *card = mmc_dev_to_card(dev);
|
|
|
|
/* CIS vendor and device ids, revision and info string are available only for Combo cards */
|
|
if ((attr == &dev_attr_vendor.attr ||
|
|
attr == &dev_attr_device.attr ||
|
|
attr == &dev_attr_revision.attr ||
|
|
attr == &dev_attr_info1.attr ||
|
|
attr == &dev_attr_info2.attr ||
|
|
attr == &dev_attr_info3.attr ||
|
|
attr == &dev_attr_info4.attr
|
|
) &&!mmc_card_sd_combo(card))
|
|
return 0;
|
|
|
|
return attr->mode;
|
|
}
|
|
|
|
static const struct attribute_group sd_std_group = {
|
|
.attrs = sd_std_attrs,
|
|
.is_visible = sd_std_is_visible,
|
|
};
|
|
__ATTRIBUTE_GROUPS(sd_std);
|
|
|
|
struct device_type sd_type = {
|
|
.groups = sd_std_groups,
|
|
};
|
|
|
|
/*
|
|
* Fetch CID from card.
|
|
*/
|
|
int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
|
|
{
|
|
int err;
|
|
u32 max_current;
|
|
int retries = 10;
|
|
u32 pocr = ocr;
|
|
|
|
try_again:
|
|
if (!retries) {
|
|
ocr &= ~SD_OCR_S18R;
|
|
pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
|
|
}
|
|
|
|
/*
|
|
* Since we're changing the OCR value, we seem to
|
|
* need to tell some cards to go back to the idle
|
|
* state. We wait 1ms to give cards time to
|
|
* respond.
|
|
*/
|
|
mmc_go_idle(host);
|
|
|
|
/*
|
|
* If SD_SEND_IF_COND indicates an SD 2.0
|
|
* compliant card and we should set bit 30
|
|
* of the ocr to indicate that we can handle
|
|
* block-addressed SDHC cards.
|
|
*/
|
|
err = mmc_send_if_cond(host, ocr);
|
|
if (!err)
|
|
ocr |= SD_OCR_CCS;
|
|
|
|
/*
|
|
* If the host supports one of UHS-I modes, request the card
|
|
* to switch to 1.8V signaling level. If the card has failed
|
|
* repeatedly to switch however, skip this.
|
|
*/
|
|
if (retries && mmc_host_uhs(host))
|
|
ocr |= SD_OCR_S18R;
|
|
|
|
/*
|
|
* If the host can supply more than 150mA at current voltage,
|
|
* XPC should be set to 1.
|
|
*/
|
|
max_current = sd_get_host_max_current(host);
|
|
if (max_current > 150)
|
|
ocr |= SD_OCR_XPC;
|
|
|
|
err = mmc_send_app_op_cond(host, ocr, rocr);
|
|
if (err)
|
|
return err;
|
|
|
|
/*
|
|
* In case the S18A bit is set in the response, let's start the signal
|
|
* voltage switch procedure. SPI mode doesn't support CMD11.
|
|
* Note that, according to the spec, the S18A bit is not valid unless
|
|
* the CCS bit is set as well. We deliberately deviate from the spec in
|
|
* regards to this, which allows UHS-I to be supported for SDSC cards.
|
|
*/
|
|
if (!mmc_host_is_spi(host) && (ocr & SD_OCR_S18R) &&
|
|
rocr && (*rocr & SD_ROCR_S18A)) {
|
|
err = mmc_set_uhs_voltage(host, pocr);
|
|
if (err == -EAGAIN) {
|
|
retries--;
|
|
goto try_again;
|
|
} else if (err) {
|
|
retries = 0;
|
|
goto try_again;
|
|
}
|
|
}
|
|
|
|
err = mmc_send_cid(host, cid);
|
|
return err;
|
|
}
|
|
|
|
int mmc_sd_get_csd(struct mmc_card *card)
|
|
{
|
|
int err;
|
|
|
|
/*
|
|
* Fetch CSD from card.
|
|
*/
|
|
err = mmc_send_csd(card, card->raw_csd);
|
|
if (err)
|
|
return err;
|
|
|
|
err = mmc_decode_csd(card);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mmc_sd_get_ro(struct mmc_host *host)
|
|
{
|
|
int ro;
|
|
|
|
/*
|
|
* Some systems don't feature a write-protect pin and don't need one.
|
|
* E.g. because they only have micro-SD card slot. For those systems
|
|
* assume that the SD card is always read-write.
|
|
*/
|
|
if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
|
|
return 0;
|
|
|
|
if (!host->ops->get_ro)
|
|
return -1;
|
|
|
|
ro = host->ops->get_ro(host);
|
|
|
|
return ro;
|
|
}
|
|
|
|
int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
|
|
bool reinit)
|
|
{
|
|
int err;
|
|
|
|
if (!reinit) {
|
|
/*
|
|
* Fetch SCR from card.
|
|
*/
|
|
err = mmc_app_send_scr(card);
|
|
if (err)
|
|
return err;
|
|
|
|
err = mmc_decode_scr(card);
|
|
if (err)
|
|
return err;
|
|
|
|
/*
|
|
* Fetch and process SD Status register.
|
|
*/
|
|
err = mmc_read_ssr(card);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Erase init depends on CSD and SSR */
|
|
mmc_init_erase(card);
|
|
}
|
|
|
|
/*
|
|
* Fetch switch information from card. Note, sd3_bus_mode can change if
|
|
* voltage switch outcome changes, so do this always.
|
|
*/
|
|
err = mmc_read_switch(card);
|
|
if (err)
|
|
return err;
|
|
|
|
/*
|
|
* For SPI, enable CRC as appropriate.
|
|
* This CRC enable is located AFTER the reading of the
|
|
* card registers because some SDHC cards are not able
|
|
* to provide valid CRCs for non-512-byte blocks.
|
|
*/
|
|
if (mmc_host_is_spi(host)) {
|
|
err = mmc_spi_set_crc(host, use_spi_crc);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Check if read-only switch is active.
|
|
*/
|
|
if (!reinit) {
|
|
int ro = mmc_sd_get_ro(host);
|
|
|
|
if (ro < 0) {
|
|
pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
|
|
mmc_hostname(host));
|
|
} else if (ro > 0) {
|
|
mmc_card_set_readonly(card);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned mmc_sd_get_max_clock(struct mmc_card *card)
|
|
{
|
|
unsigned max_dtr = (unsigned int)-1;
|
|
|
|
if (mmc_card_hs(card)) {
|
|
if (max_dtr > card->sw_caps.hs_max_dtr)
|
|
max_dtr = card->sw_caps.hs_max_dtr;
|
|
} else if (max_dtr > card->csd.max_dtr) {
|
|
max_dtr = card->csd.max_dtr;
|
|
}
|
|
|
|
return max_dtr;
|
|
}
|
|
|
|
static bool mmc_sd_card_using_v18(struct mmc_card *card)
|
|
{
|
|
/*
|
|
* According to the SD spec., the Bus Speed Mode (function group 1) bits
|
|
* 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus
|
|
* they can be used to determine if the card has already switched to
|
|
* 1.8V signaling.
|
|
*/
|
|
return card->sw_caps.sd3_bus_mode &
|
|
(SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50);
|
|
}
|
|
|
|
static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, u16 offset,
|
|
u8 reg_data)
|
|
{
|
|
struct mmc_host *host = card->host;
|
|
struct mmc_request mrq = {};
|
|
struct mmc_command cmd = {};
|
|
struct mmc_data data = {};
|
|
struct scatterlist sg;
|
|
u8 *reg_buf;
|
|
|
|
reg_buf = kzalloc(512, GFP_KERNEL);
|
|
if (!reg_buf)
|
|
return -ENOMEM;
|
|
|
|
mrq.cmd = &cmd;
|
|
mrq.data = &data;
|
|
|
|
/*
|
|
* Arguments of CMD49:
|
|
* [31:31] MIO (0 = memory).
|
|
* [30:27] FNO (function number).
|
|
* [26:26] MW - mask write mode (0 = disable).
|
|
* [25:18] page number.
|
|
* [17:9] offset address.
|
|
* [8:0] length (0 = 1 byte).
|
|
*/
|
|
cmd.arg = fno << 27 | page << 18 | offset << 9;
|
|
|
|
/* The first byte in the buffer is the data to be written. */
|
|
reg_buf[0] = reg_data;
|
|
|
|
data.flags = MMC_DATA_WRITE;
|
|
data.blksz = 512;
|
|
data.blocks = 1;
|
|
data.sg = &sg;
|
|
data.sg_len = 1;
|
|
sg_init_one(&sg, reg_buf, 512);
|
|
|
|
cmd.opcode = SD_WRITE_EXTR_SINGLE;
|
|
cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
|
|
|
|
mmc_set_data_timeout(&data, card);
|
|
mmc_wait_for_req(host, &mrq);
|
|
|
|
kfree(reg_buf);
|
|
|
|
/*
|
|
* Note that, the SD card is allowed to signal busy on DAT0 up to 1s
|
|
* after the CMD49. Although, let's leave this to be managed by the
|
|
* caller.
|
|
*/
|
|
|
|
if (cmd.error)
|
|
return cmd.error;
|
|
if (data.error)
|
|
return data.error;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sd_read_ext_reg(struct mmc_card *card, u8 fno, u8 page,
|
|
u16 offset, u16 len, u8 *reg_buf)
|
|
{
|
|
u32 cmd_args;
|
|
|
|
/*
|
|
* Command arguments of CMD48:
|
|
* [31:31] MIO (0 = memory).
|
|
* [30:27] FNO (function number).
|
|
* [26:26] reserved (0).
|
|
* [25:18] page number.
|
|
* [17:9] offset address.
|
|
* [8:0] length (0 = 1 byte, 1ff = 512 bytes).
|
|
*/
|
|
cmd_args = fno << 27 | page << 18 | offset << 9 | (len -1);
|
|
|
|
return mmc_send_adtc_data(card, card->host, SD_READ_EXTR_SINGLE,
|
|
cmd_args, reg_buf, 512);
|
|
}
|
|
|
|
static int sd_parse_ext_reg_power(struct mmc_card *card, u8 fno, u8 page,
|
|
u16 offset)
|
|
{
|
|
int err;
|
|
u8 *reg_buf;
|
|
|
|
reg_buf = kzalloc(512, GFP_KERNEL);
|
|
if (!reg_buf)
|
|
return -ENOMEM;
|
|
|
|
/* Read the extension register for power management function. */
|
|
err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf);
|
|
if (err) {
|
|
pr_warn("%s: error %d reading PM func of ext reg\n",
|
|
mmc_hostname(card->host), err);
|
|
goto out;
|
|
}
|
|
|
|
/* PM revision consists of 4 bits. */
|
|
card->ext_power.rev = reg_buf[0] & 0xf;
|
|
|
|
/* Power Off Notification support at bit 4. */
|
|
if (reg_buf[1] & BIT(4))
|
|
card->ext_power.feature_support |= SD_EXT_POWER_OFF_NOTIFY;
|
|
|
|
/* Power Sustenance support at bit 5. */
|
|
if (reg_buf[1] & BIT(5))
|
|
card->ext_power.feature_support |= SD_EXT_POWER_SUSTENANCE;
|
|
|
|
/* Power Down Mode support at bit 6. */
|
|
if (reg_buf[1] & BIT(6))
|
|
card->ext_power.feature_support |= SD_EXT_POWER_DOWN_MODE;
|
|
|
|
card->ext_power.fno = fno;
|
|
card->ext_power.page = page;
|
|
card->ext_power.offset = offset;
|
|
|
|
out:
|
|
kfree(reg_buf);
|
|
return err;
|
|
}
|
|
|
|
static int sd_parse_ext_reg_perf(struct mmc_card *card, u8 fno, u8 page,
|
|
u16 offset)
|
|
{
|
|
int err;
|
|
u8 *reg_buf;
|
|
|
|
reg_buf = kzalloc(512, GFP_KERNEL);
|
|
if (!reg_buf)
|
|
return -ENOMEM;
|
|
|
|
err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf);
|
|
if (err) {
|
|
pr_warn("%s: error %d reading PERF func of ext reg\n",
|
|
mmc_hostname(card->host), err);
|
|
goto out;
|
|
}
|
|
|
|
/* PERF revision. */
|
|
card->ext_perf.rev = reg_buf[0];
|
|
|
|
/* FX_EVENT support at bit 0. */
|
|
if (reg_buf[1] & BIT(0))
|
|
card->ext_perf.feature_support |= SD_EXT_PERF_FX_EVENT;
|
|
|
|
/* Card initiated self-maintenance support at bit 0. */
|
|
if (reg_buf[2] & BIT(0))
|
|
card->ext_perf.feature_support |= SD_EXT_PERF_CARD_MAINT;
|
|
|
|
/* Host initiated self-maintenance support at bit 1. */
|
|
if (reg_buf[2] & BIT(1))
|
|
card->ext_perf.feature_support |= SD_EXT_PERF_HOST_MAINT;
|
|
|
|
/* Cache support at bit 0. */
|
|
if (reg_buf[4] & BIT(0))
|
|
card->ext_perf.feature_support |= SD_EXT_PERF_CACHE;
|
|
|
|
/* Command queue support indicated via queue depth bits (0 to 4). */
|
|
if (reg_buf[6] & 0x1f)
|
|
card->ext_perf.feature_support |= SD_EXT_PERF_CMD_QUEUE;
|
|
|
|
card->ext_perf.fno = fno;
|
|
card->ext_perf.page = page;
|
|
card->ext_perf.offset = offset;
|
|
|
|
out:
|
|
kfree(reg_buf);
|
|
return err;
|
|
}
|
|
|
|
static int sd_parse_ext_reg(struct mmc_card *card, u8 *gen_info_buf,
|
|
u16 *next_ext_addr)
|
|
{
|
|
u8 num_regs, fno, page;
|
|
u16 sfc, offset, ext = *next_ext_addr;
|
|
u32 reg_addr;
|
|
|
|
/*
|
|
* Parse only one register set per extension, as that is sufficient to
|
|
* support the standard functions. This means another 48 bytes in the
|
|
* buffer must be available.
|
|
*/
|
|
if (ext + 48 > 512)
|
|
return -EFAULT;
|
|
|
|
/* Standard Function Code */
|
|
memcpy(&sfc, &gen_info_buf[ext], 2);
|
|
|
|
/* Address to the next extension. */
|
|
memcpy(next_ext_addr, &gen_info_buf[ext + 40], 2);
|
|
|
|
/* Number of registers for this extension. */
|
|
num_regs = gen_info_buf[ext + 42];
|
|
|
|
/* We support only one register per extension. */
|
|
if (num_regs != 1)
|
|
return 0;
|
|
|
|
/* Extension register address. */
|
|
memcpy(®_addr, &gen_info_buf[ext + 44], 4);
|
|
|
|
/* 9 bits (0 to 8) contains the offset address. */
|
|
offset = reg_addr & 0x1ff;
|
|
|
|
/* 8 bits (9 to 16) contains the page number. */
|
|
page = reg_addr >> 9 & 0xff ;
|
|
|
|
/* 4 bits (18 to 21) contains the function number. */
|
|
fno = reg_addr >> 18 & 0xf;
|
|
|
|
/* Standard Function Code for power management. */
|
|
if (sfc == 0x1)
|
|
return sd_parse_ext_reg_power(card, fno, page, offset);
|
|
|
|
/* Standard Function Code for performance enhancement. */
|
|
if (sfc == 0x2)
|
|
return sd_parse_ext_reg_perf(card, fno, page, offset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sd_read_ext_regs(struct mmc_card *card)
|
|
{
|
|
int err, i;
|
|
u8 num_ext, *gen_info_buf;
|
|
u16 rev, len, next_ext_addr;
|
|
|
|
if (mmc_host_is_spi(card->host))
|
|
return 0;
|
|
|
|
if (!(card->scr.cmds & SD_SCR_CMD48_SUPPORT))
|
|
return 0;
|
|
|
|
gen_info_buf = kzalloc(512, GFP_KERNEL);
|
|
if (!gen_info_buf)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Read 512 bytes of general info, which is found at function number 0,
|
|
* at page 0 and with no offset.
|
|
*/
|
|
err = sd_read_ext_reg(card, 0, 0, 0, 512, gen_info_buf);
|
|
if (err) {
|
|
pr_err("%s: error %d reading general info of SD ext reg\n",
|
|
mmc_hostname(card->host), err);
|
|
goto out;
|
|
}
|
|
|
|
/* General info structure revision. */
|
|
memcpy(&rev, &gen_info_buf[0], 2);
|
|
|
|
/* Length of general info in bytes. */
|
|
memcpy(&len, &gen_info_buf[2], 2);
|
|
|
|
/* Number of extensions to be find. */
|
|
num_ext = gen_info_buf[4];
|
|
|
|
/*
|
|
* We only support revision 0 and limit it to 512 bytes for simplicity.
|
|
* No matter what, let's return zero to allow us to continue using the
|
|
* card, even if we can't support the features from the SD function
|
|
* extensions registers.
|
|
*/
|
|
if (rev != 0 || len > 512) {
|
|
pr_warn("%s: non-supported SD ext reg layout\n",
|
|
mmc_hostname(card->host));
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Parse the extension registers. The first extension should start
|
|
* immediately after the general info header (16 bytes).
|
|
*/
|
|
next_ext_addr = 16;
|
|
for (i = 0; i < num_ext; i++) {
|
|
err = sd_parse_ext_reg(card, gen_info_buf, &next_ext_addr);
|
|
if (err) {
|
|
pr_err("%s: error %d parsing SD ext reg\n",
|
|
mmc_hostname(card->host), err);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(gen_info_buf);
|
|
return err;
|
|
}
|
|
|
|
static bool sd_cache_enabled(struct mmc_host *host)
|
|
{
|
|
return host->card->ext_perf.feature_enabled & SD_EXT_PERF_CACHE;
|
|
}
|
|
|
|
static int sd_flush_cache(struct mmc_host *host)
|
|
{
|
|
struct mmc_card *card = host->card;
|
|
u8 *reg_buf, fno, page;
|
|
u16 offset;
|
|
int err;
|
|
|
|
if (!sd_cache_enabled(host))
|
|
return 0;
|
|
|
|
reg_buf = kzalloc(512, GFP_KERNEL);
|
|
if (!reg_buf)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Set Flush Cache at bit 0 in the performance enhancement register at
|
|
* 261 bytes offset.
|
|
*/
|
|
fno = card->ext_perf.fno;
|
|
page = card->ext_perf.page;
|
|
offset = card->ext_perf.offset + 261;
|
|
|
|
err = sd_write_ext_reg(card, fno, page, offset, BIT(0));
|
|
if (err) {
|
|
pr_warn("%s: error %d writing Cache Flush bit\n",
|
|
mmc_hostname(host), err);
|
|
goto out;
|
|
}
|
|
|
|
err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
|
|
MMC_BUSY_EXTR_SINGLE);
|
|
if (err)
|
|
goto out;
|
|
|
|
/*
|
|
* Read the Flush Cache bit. The card shall reset it, to confirm that
|
|
* it's has completed the flushing of the cache.
|
|
*/
|
|
err = sd_read_ext_reg(card, fno, page, offset, 1, reg_buf);
|
|
if (err) {
|
|
pr_warn("%s: error %d reading Cache Flush bit\n",
|
|
mmc_hostname(host), err);
|
|
goto out;
|
|
}
|
|
|
|
if (reg_buf[0] & BIT(0))
|
|
err = -ETIMEDOUT;
|
|
out:
|
|
kfree(reg_buf);
|
|
return err;
|
|
}
|
|
|
|
static int sd_enable_cache(struct mmc_card *card)
|
|
{
|
|
u8 *reg_buf;
|
|
int err;
|
|
|
|
card->ext_perf.feature_enabled &= ~SD_EXT_PERF_CACHE;
|
|
|
|
reg_buf = kzalloc(512, GFP_KERNEL);
|
|
if (!reg_buf)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Set Cache Enable at bit 0 in the performance enhancement register at
|
|
* 260 bytes offset.
|
|
*/
|
|
err = sd_write_ext_reg(card, card->ext_perf.fno, card->ext_perf.page,
|
|
card->ext_perf.offset + 260, BIT(0));
|
|
if (err) {
|
|
pr_warn("%s: error %d writing Cache Enable bit\n",
|
|
mmc_hostname(card->host), err);
|
|
goto out;
|
|
}
|
|
|
|
err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
|
|
MMC_BUSY_EXTR_SINGLE);
|
|
if (!err)
|
|
card->ext_perf.feature_enabled |= SD_EXT_PERF_CACHE;
|
|
|
|
out:
|
|
kfree(reg_buf);
|
|
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_sd_init_card(struct mmc_host *host, u32 ocr,
|
|
struct mmc_card *oldcard)
|
|
{
|
|
struct mmc_card *card;
|
|
int err;
|
|
u32 cid[4];
|
|
u32 rocr = 0;
|
|
bool v18_fixup_failed = false;
|
|
|
|
WARN_ON(!host->claimed);
|
|
retry:
|
|
err = mmc_sd_get_cid(host, ocr, cid, &rocr);
|
|
if (err)
|
|
return err;
|
|
|
|
if (oldcard) {
|
|
if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
|
|
pr_debug("%s: Perhaps the card was replaced\n",
|
|
mmc_hostname(host));
|
|
return -ENOENT;
|
|
}
|
|
|
|
card = oldcard;
|
|
} else {
|
|
/*
|
|
* Allocate card structure.
|
|
*/
|
|
card = mmc_alloc_card(host, &sd_type);
|
|
if (IS_ERR(card))
|
|
return PTR_ERR(card);
|
|
|
|
card->ocr = ocr;
|
|
card->type = MMC_TYPE_SD;
|
|
memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
|
|
}
|
|
|
|
/*
|
|
* Call the optional HC's init_card function to handle quirks.
|
|
*/
|
|
if (host->ops->init_card)
|
|
host->ops->init_card(host, card);
|
|
|
|
/*
|
|
* For native busses: get card RCA and quit open drain mode.
|
|
*/
|
|
if (!mmc_host_is_spi(host)) {
|
|
err = mmc_send_relative_addr(host, &card->rca);
|
|
if (err)
|
|
goto free_card;
|
|
}
|
|
|
|
if (!oldcard) {
|
|
err = mmc_sd_get_csd(card);
|
|
if (err)
|
|
goto free_card;
|
|
|
|
mmc_decode_cid(card);
|
|
}
|
|
|
|
/*
|
|
* handling only for cards supporting DSR and hosts requesting
|
|
* DSR configuration
|
|
*/
|
|
if (card->csd.dsr_imp && host->dsr_req)
|
|
mmc_set_dsr(host);
|
|
|
|
/*
|
|
* Select card, as all following commands rely on that.
|
|
*/
|
|
if (!mmc_host_is_spi(host)) {
|
|
err = mmc_select_card(card);
|
|
if (err)
|
|
goto free_card;
|
|
}
|
|
|
|
err = mmc_sd_setup_card(host, card, oldcard != NULL);
|
|
if (err)
|
|
goto free_card;
|
|
|
|
/*
|
|
* If the card has not been power cycled, it may still be using 1.8V
|
|
* signaling. Detect that situation and try to initialize a UHS-I (1.8V)
|
|
* transfer mode.
|
|
*/
|
|
if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
|
|
mmc_sd_card_using_v18(card) &&
|
|
host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
|
|
if (mmc_host_set_uhs_voltage(host) ||
|
|
mmc_sd_init_uhs_card(card)) {
|
|
v18_fixup_failed = true;
|
|
mmc_power_cycle(host, ocr);
|
|
if (!oldcard)
|
|
mmc_remove_card(card);
|
|
goto retry;
|
|
}
|
|
goto cont;
|
|
}
|
|
|
|
/* Initialization sequence for UHS-I cards */
|
|
if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {
|
|
err = mmc_sd_init_uhs_card(card);
|
|
if (err)
|
|
goto free_card;
|
|
} else {
|
|
/*
|
|
* Attempt to change to high-speed (if supported)
|
|
*/
|
|
err = mmc_sd_switch_hs(card);
|
|
if (err > 0)
|
|
mmc_set_timing(card->host, MMC_TIMING_SD_HS);
|
|
else if (err)
|
|
goto free_card;
|
|
|
|
/*
|
|
* Set bus speed.
|
|
*/
|
|
mmc_set_clock(host, mmc_sd_get_max_clock(card));
|
|
|
|
/*
|
|
* Switch to wider bus (if supported).
|
|
*/
|
|
if ((host->caps & MMC_CAP_4_BIT_DATA) &&
|
|
(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
|
|
err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
|
|
if (err)
|
|
goto free_card;
|
|
|
|
mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
|
|
}
|
|
}
|
|
cont:
|
|
if (!oldcard) {
|
|
/* Read/parse the extension registers. */
|
|
err = sd_read_ext_regs(card);
|
|
if (err)
|
|
goto free_card;
|
|
}
|
|
|
|
/* Enable internal SD cache if supported. */
|
|
if (card->ext_perf.feature_support & SD_EXT_PERF_CACHE) {
|
|
err = sd_enable_cache(card);
|
|
if (err)
|
|
goto free_card;
|
|
}
|
|
|
|
if (host->cqe_ops && !host->cqe_enabled) {
|
|
err = host->cqe_ops->cqe_enable(host, card);
|
|
if (!err) {
|
|
host->cqe_enabled = true;
|
|
host->hsq_enabled = true;
|
|
pr_info("%s: Host Software Queue enabled\n",
|
|
mmc_hostname(host));
|
|
}
|
|
}
|
|
|
|
if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
|
|
host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
|
|
pr_err("%s: Host failed to negotiate down from 3.3V\n",
|
|
mmc_hostname(host));
|
|
err = -EINVAL;
|
|
goto free_card;
|
|
}
|
|
|
|
host->card = card;
|
|
return 0;
|
|
|
|
free_card:
|
|
if (!oldcard)
|
|
mmc_remove_card(card);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Host is being removed. Free up the current card.
|
|
*/
|
|
static void mmc_sd_remove(struct mmc_host *host)
|
|
{
|
|
mmc_remove_card(host->card);
|
|
host->card = NULL;
|
|
}
|
|
|
|
/*
|
|
* Card detection - card is alive.
|
|
*/
|
|
static int mmc_sd_alive(struct mmc_host *host)
|
|
{
|
|
return mmc_send_status(host->card, NULL);
|
|
}
|
|
|
|
/*
|
|
* Card detection callback from host.
|
|
*/
|
|
static void mmc_sd_detect(struct mmc_host *host)
|
|
{
|
|
int err;
|
|
|
|
mmc_get_card(host->card, NULL);
|
|
|
|
/*
|
|
* Just check if our card has been removed.
|
|
*/
|
|
err = _mmc_detect_card_removed(host);
|
|
|
|
mmc_put_card(host->card, NULL);
|
|
|
|
if (err) {
|
|
mmc_sd_remove(host);
|
|
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_power_off(host);
|
|
mmc_release_host(host);
|
|
}
|
|
}
|
|
|
|
static int sd_can_poweroff_notify(struct mmc_card *card)
|
|
{
|
|
return card->ext_power.feature_support & SD_EXT_POWER_OFF_NOTIFY;
|
|
}
|
|
|
|
static int sd_busy_poweroff_notify_cb(void *cb_data, bool *busy)
|
|
{
|
|
struct sd_busy_data *data = cb_data;
|
|
struct mmc_card *card = data->card;
|
|
int err;
|
|
|
|
/*
|
|
* Read the status register for the power management function. It's at
|
|
* one byte offset and is one byte long. The Power Off Notification
|
|
* Ready is bit 0.
|
|
*/
|
|
err = sd_read_ext_reg(card, card->ext_power.fno, card->ext_power.page,
|
|
card->ext_power.offset + 1, 1, data->reg_buf);
|
|
if (err) {
|
|
pr_warn("%s: error %d reading status reg of PM func\n",
|
|
mmc_hostname(card->host), err);
|
|
return err;
|
|
}
|
|
|
|
*busy = !(data->reg_buf[0] & BIT(0));
|
|
return 0;
|
|
}
|
|
|
|
static int sd_poweroff_notify(struct mmc_card *card)
|
|
{
|
|
struct sd_busy_data cb_data;
|
|
u8 *reg_buf;
|
|
int err;
|
|
|
|
reg_buf = kzalloc(512, GFP_KERNEL);
|
|
if (!reg_buf)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Set the Power Off Notification bit in the power management settings
|
|
* register at 2 bytes offset.
|
|
*/
|
|
err = sd_write_ext_reg(card, card->ext_power.fno, card->ext_power.page,
|
|
card->ext_power.offset + 2, BIT(0));
|
|
if (err) {
|
|
pr_warn("%s: error %d writing Power Off Notify bit\n",
|
|
mmc_hostname(card->host), err);
|
|
goto out;
|
|
}
|
|
|
|
/* Find out when the command is completed. */
|
|
err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
|
|
MMC_BUSY_EXTR_SINGLE);
|
|
if (err)
|
|
goto out;
|
|
|
|
cb_data.card = card;
|
|
cb_data.reg_buf = reg_buf;
|
|
err = __mmc_poll_for_busy(card->host, 0, SD_POWEROFF_NOTIFY_TIMEOUT_MS,
|
|
&sd_busy_poweroff_notify_cb, &cb_data);
|
|
|
|
out:
|
|
kfree(reg_buf);
|
|
return err;
|
|
}
|
|
|
|
static int _mmc_sd_suspend(struct mmc_host *host)
|
|
{
|
|
struct mmc_card *card = host->card;
|
|
int err = 0;
|
|
|
|
mmc_claim_host(host);
|
|
|
|
if (mmc_card_suspended(card))
|
|
goto out;
|
|
|
|
if (sd_can_poweroff_notify(card))
|
|
err = sd_poweroff_notify(card);
|
|
else if (!mmc_host_is_spi(host))
|
|
err = mmc_deselect_cards(host);
|
|
|
|
if (!err) {
|
|
mmc_power_off(host);
|
|
mmc_card_set_suspended(card);
|
|
}
|
|
|
|
out:
|
|
mmc_release_host(host);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Callback for suspend
|
|
*/
|
|
static int mmc_sd_suspend(struct mmc_host *host)
|
|
{
|
|
int err;
|
|
|
|
err = _mmc_sd_suspend(host);
|
|
if (!err) {
|
|
pm_runtime_disable(&host->card->dev);
|
|
pm_runtime_set_suspended(&host->card->dev);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* This function tries to determine if the same card is still present
|
|
* and, if so, restore all state to it.
|
|
*/
|
|
static int _mmc_sd_resume(struct mmc_host *host)
|
|
{
|
|
int err = 0;
|
|
|
|
mmc_claim_host(host);
|
|
|
|
if (!mmc_card_suspended(host->card))
|
|
goto out;
|
|
|
|
mmc_power_up(host, host->card->ocr);
|
|
err = mmc_sd_init_card(host, host->card->ocr, host->card);
|
|
mmc_card_clr_suspended(host->card);
|
|
|
|
out:
|
|
mmc_release_host(host);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Callback for resume
|
|
*/
|
|
static int mmc_sd_resume(struct mmc_host *host)
|
|
{
|
|
pm_runtime_enable(&host->card->dev);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Callback for runtime_suspend.
|
|
*/
|
|
static int mmc_sd_runtime_suspend(struct mmc_host *host)
|
|
{
|
|
int err;
|
|
|
|
if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
|
|
return 0;
|
|
|
|
err = _mmc_sd_suspend(host);
|
|
if (err)
|
|
pr_err("%s: error %d doing aggressive suspend\n",
|
|
mmc_hostname(host), err);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Callback for runtime_resume.
|
|
*/
|
|
static int mmc_sd_runtime_resume(struct mmc_host *host)
|
|
{
|
|
int err;
|
|
|
|
err = _mmc_sd_resume(host);
|
|
if (err && err != -ENOMEDIUM)
|
|
pr_err("%s: error %d doing runtime resume\n",
|
|
mmc_hostname(host), err);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mmc_sd_hw_reset(struct mmc_host *host)
|
|
{
|
|
mmc_power_cycle(host, host->card->ocr);
|
|
return mmc_sd_init_card(host, host->card->ocr, host->card);
|
|
}
|
|
|
|
static const struct mmc_bus_ops mmc_sd_ops = {
|
|
.remove = mmc_sd_remove,
|
|
.detect = mmc_sd_detect,
|
|
.runtime_suspend = mmc_sd_runtime_suspend,
|
|
.runtime_resume = mmc_sd_runtime_resume,
|
|
.suspend = mmc_sd_suspend,
|
|
.resume = mmc_sd_resume,
|
|
.alive = mmc_sd_alive,
|
|
.shutdown = mmc_sd_suspend,
|
|
.hw_reset = mmc_sd_hw_reset,
|
|
.cache_enabled = sd_cache_enabled,
|
|
.flush_cache = sd_flush_cache,
|
|
};
|
|
|
|
/*
|
|
* Starting point for SD card init.
|
|
*/
|
|
int mmc_attach_sd(struct mmc_host *host)
|
|
{
|
|
int err;
|
|
u32 ocr, rocr;
|
|
|
|
WARN_ON(!host->claimed);
|
|
|
|
err = mmc_send_app_op_cond(host, 0, &ocr);
|
|
if (err)
|
|
return err;
|
|
|
|
mmc_attach_bus(host, &mmc_sd_ops);
|
|
if (host->ocr_avail_sd)
|
|
host->ocr_avail = host->ocr_avail_sd;
|
|
|
|
/*
|
|
* We need to get OCR a different way for SPI.
|
|
*/
|
|
if (mmc_host_is_spi(host)) {
|
|
mmc_go_idle(host);
|
|
|
|
err = mmc_spi_read_ocr(host, 0, &ocr);
|
|
if (err)
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Some SD cards claims an out of spec VDD voltage range. Let's treat
|
|
* these bits as being in-valid and especially also bit7.
|
|
*/
|
|
ocr &= ~0x7FFF;
|
|
|
|
rocr = mmc_select_voltage(host, ocr);
|
|
|
|
/*
|
|
* Can we support the voltage(s) of the card(s)?
|
|
*/
|
|
if (!rocr) {
|
|
err = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Detect and init the card.
|
|
*/
|
|
err = mmc_sd_init_card(host, rocr, NULL);
|
|
if (err)
|
|
goto err;
|
|
|
|
mmc_release_host(host);
|
|
err = mmc_add_card(host->card);
|
|
if (err)
|
|
goto remove_card;
|
|
|
|
mmc_claim_host(host);
|
|
return 0;
|
|
|
|
remove_card:
|
|
mmc_remove_card(host->card);
|
|
host->card = NULL;
|
|
mmc_claim_host(host);
|
|
err:
|
|
mmc_detach_bus(host);
|
|
|
|
pr_err("%s: error %d whilst initialising SD card\n",
|
|
mmc_hostname(host), err);
|
|
|
|
return err;
|
|
}
|