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linux/drivers/mmc/core/sd.c
Aaron Lu 108ecc4cf9 mmc: core: reset signal voltage on power up 
Add a call to mmc_set_signal_voltage() to set signal voltage to 3.3v in
mmc_power_up so that we do not need to touch signal voltage setting in
mmc/sd/sdio init functions and rescan function.

For mmc/sd cards, when doing a suspend/resume cycle, consider the unsafe
resume case, the card will lose its power and when powered on again, we
will set signal voltage to 3.3v in mmc_power_up before its resume function
gets called, which will re-init the card.

And for sdio cards, when doing a suspend/resume cycle, consider the unsafe
resume case, the card will either lose its power or not depending on if it
wants to wakeup the host. If power is not maintained, it is the same case as
mmc/sd cards. If power is maintained, mmc_power_up will not be called and
the card's signal voltage will remain at the last setting.

Signed-off-by: Aaron Lu <aaron.lu@amd.com>
Tested-by: Venkatraman S <svenkatr@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-22 15:25:53 -04:00

1235 lines
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/*
* 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.
*
* 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/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
#include "core.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 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.
*/
void mmc_decode_cid(struct mmc_card *card)
{
u32 *resp = card->raw_cid;
memset(&card->cid, 0, sizeof(struct mmc_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->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
m = UNSTUFF_BITS(resp, 99, 4);
e = UNSTUFF_BITS(resp, 96, 3);
csd->max_dtr = tran_exp[e] * tran_mant[m];
csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
e = UNSTUFF_BITS(resp, 47, 3);
m = UNSTUFF_BITS(resp, 62, 12);
csd->capacity = (1 + m) << (e + 2);
csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
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;
}
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->tacc_ns = 0; /* Unused */
csd->tacc_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;
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 (UNSTUFF_BITS(resp, 55, 1))
card->erased_byte = 0xFF;
else
card->erased_byte = 0x0;
if (scr->sda_spec3)
scr->cmds = UNSTUFF_BITS(resp, 32, 2);
return 0;
}
/*
* Fetch and process SD Status register.
*/
static int mmc_read_ssr(struct mmc_card *card)
{
unsigned int au, es, et, eo;
int err, i;
u32 *ssr;
if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
pr_warning("%s: card lacks mandatory SD Status "
"function.\n", mmc_hostname(card->host));
return 0;
}
ssr = kmalloc(64, GFP_KERNEL);
if (!ssr)
return -ENOMEM;
err = mmc_app_sd_status(card, ssr);
if (err) {
pr_warning("%s: problem reading SD Status "
"register.\n", mmc_hostname(card->host));
err = 0;
goto out;
}
for (i = 0; i < 16; i++)
ssr[i] = be32_to_cpu(ssr[i]);
/*
* UNSTUFF_BITS only works with four u32s so we have to offset the
* bitfield positions accordingly.
*/
au = UNSTUFF_BITS(ssr, 428 - 384, 4);
if (au > 0 && au <= 9) {
card->ssr.au = 1 << (au + 4);
es = UNSTUFF_BITS(ssr, 408 - 384, 16);
et = UNSTUFF_BITS(ssr, 402 - 384, 6);
eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
if (es && et) {
card->ssr.erase_timeout = (et * 1000) / es;
card->ssr.erase_offset = eo * 1000;
}
} else {
pr_warning("%s: SD Status: Invalid Allocation Unit "
"size.\n", mmc_hostname(card->host));
}
out:
kfree(ssr);
return err;
}
/*
* 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_warning("%s: card lacks mandatory switch "
"function, performance might suffer.\n",
mmc_hostname(card->host));
return 0;
}
err = -EIO;
status = kmalloc(64, GFP_KERNEL);
if (!status) {
pr_err("%s: could not allocate a buffer for "
"switch capabilities.\n",
mmc_hostname(card->host));
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_warning("%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];
}
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;
err = -EIO;
status = kmalloc(64, GFP_KERNEL);
if (!status) {
pr_err("%s: could not allocate a buffer for "
"switch capabilities.\n", mmc_hostname(card->host));
return -ENOMEM;
}
err = mmc_sd_switch(card, 1, 0, 1, status);
if (err)
goto out;
if ((status[16] & 0xF) != 1) {
pr_warning("%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 host_drv_type = SD_DRIVER_TYPE_B;
int card_drv_type = SD_DRIVER_TYPE_B;
int drive_strength;
int err;
/*
* If the host doesn't support any of the Driver Types A,C or D,
* or there is no board specific handler then default Driver
* Type B is used.
*/
if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
| MMC_CAP_DRIVER_TYPE_D)))
return 0;
if (!card->host->ops->select_drive_strength)
return 0;
if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
host_drv_type |= SD_DRIVER_TYPE_A;
if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
host_drv_type |= SD_DRIVER_TYPE_C;
if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
host_drv_type |= SD_DRIVER_TYPE_D;
if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
card_drv_type |= SD_DRIVER_TYPE_A;
if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
card_drv_type |= SD_DRIVER_TYPE_C;
if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
card_drv_type |= SD_DRIVER_TYPE_D;
/*
* The drive strength that the hardware can support
* depends on the board design. Pass the appropriate
* information and let the hardware specific code
* return what is possible given the options
*/
mmc_host_clk_hold(card->host);
drive_strength = card->host->ops->select_drive_strength(
card->sw_caps.uhs_max_dtr,
host_drv_type, card_drv_type);
mmc_host_clk_release(card->host);
err = mmc_sd_switch(card, 1, 2, drive_strength, status);
if (err)
return err;
if ((status[15] & 0xF) != drive_strength) {
pr_warning("%s: Problem setting drive strength!\n",
mmc_hostname(card->host));
return 0;
}
mmc_set_driver_type(card->host, drive_strength);
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 (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) {
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_warning("%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.
*/
if (max_current >= 800)
current_limit = SD_SET_CURRENT_LIMIT_800;
else if (max_current >= 600)
current_limit = SD_SET_CURRENT_LIMIT_600;
else if (max_current >= 400)
current_limit = SD_SET_CURRENT_LIMIT_400;
else if (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_warning("%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->scr.sda_spec3)
return 0;
if (!(card->csd.cmdclass & CCC_SWITCH))
return 0;
status = kmalloc(64, GFP_KERNEL);
if (!status) {
pr_err("%s: could not allocate a buffer for "
"switch capabilities.\n", mmc_hostname(card->host));
return -ENOMEM;
}
/* Set 4-bit bus width */
if ((card->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 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 */
if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) {
mmc_host_clk_hold(card->host);
err = card->host->ops->execute_tuning(card->host,
MMC_SEND_TUNING_BLOCK);
mmc_host_clk_release(card->host);
}
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(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);
static struct attribute *sd_std_attrs[] = {
&dev_attr_cid.attr,
&dev_attr_csd.attr,
&dev_attr_scr.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,
NULL,
};
static struct attribute_group sd_std_attr_group = {
.attrs = sd_std_attrs,
};
static const struct attribute_group *sd_attr_groups[] = {
&sd_std_attr_group,
NULL,
};
struct device_type sd_type = {
.groups = sd_attr_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;
/*
* 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 (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
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;
try_again:
err = mmc_send_app_op_cond(host, ocr, rocr);
if (err)
return err;
/*
* In case CCS and S18A in the response is set, start Signal Voltage
* Switch procedure. SPI mode doesn't support CMD11.
*/
if (!mmc_host_is_spi(host) && rocr &&
((*rocr & 0x41000000) == 0x41000000)) {
err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
if (err) {
ocr &= ~SD_OCR_S18R;
goto try_again;
}
}
if (mmc_host_is_spi(host))
err = mmc_send_cid(host, cid);
else
err = mmc_all_send_cid(host, cid);
return err;
}
int mmc_sd_get_csd(struct mmc_host *host, 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;
}
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, card->raw_scr);
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.
*/
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 = -1;
if (host->ops->get_ro) {
mmc_host_clk_hold(card->host);
ro = host->ops->get_ro(host);
mmc_host_clk_release(card->host);
}
if (ro < 0) {
pr_warning("%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_highspeed(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;
}
void mmc_sd_go_highspeed(struct mmc_card *card)
{
mmc_card_set_highspeed(card);
mmc_set_timing(card->host, MMC_TIMING_SD_HS);
}
/*
* 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;
BUG_ON(!host);
WARN_ON(!host->claimed);
err = mmc_sd_get_cid(host, ocr, cid, &rocr);
if (err)
return err;
if (oldcard) {
if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
return -ENOENT;
card = oldcard;
} else {
/*
* Allocate card structure.
*/
card = mmc_alloc_card(host, &sd_type);
if (IS_ERR(card))
return PTR_ERR(card);
card->type = MMC_TYPE_SD;
memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
}
/*
* 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)
return err;
}
if (!oldcard) {
err = mmc_sd_get_csd(host, card);
if (err)
return err;
mmc_decode_cid(card);
}
/*
* Select card, as all following commands rely on that.
*/
if (!mmc_host_is_spi(host)) {
err = mmc_select_card(card);
if (err)
return err;
}
err = mmc_sd_setup_card(host, card, oldcard != NULL);
if (err)
goto free_card;
/* Initialization sequence for UHS-I cards */
if (rocr & SD_ROCR_S18A) {
err = mmc_sd_init_uhs_card(card);
if (err)
goto free_card;
/* Card is an ultra-high-speed card */
mmc_card_set_uhs(card);
/*
* Since initialization is now complete, enable preset
* value registers for UHS-I cards.
*/
if (host->ops->enable_preset_value) {
mmc_host_clk_hold(card->host);
host->ops->enable_preset_value(host, true);
mmc_host_clk_release(card->host);
}
} else {
/*
* Attempt to change to high-speed (if supported)
*/
err = mmc_sd_switch_hs(card);
if (err > 0)
mmc_sd_go_highspeed(card);
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);
}
}
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)
{
BUG_ON(!host);
BUG_ON(!host->card);
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;
BUG_ON(!host);
BUG_ON(!host->card);
mmc_claim_host(host);
/*
* Just check if our card has been removed.
*/
err = _mmc_detect_card_removed(host);
mmc_release_host(host);
if (err) {
mmc_sd_remove(host);
mmc_claim_host(host);
mmc_detach_bus(host);
mmc_power_off(host);
mmc_release_host(host);
}
}
/*
* Suspend callback from host.
*/
static int mmc_sd_suspend(struct mmc_host *host)
{
int err = 0;
BUG_ON(!host);
BUG_ON(!host->card);
mmc_claim_host(host);
if (!mmc_host_is_spi(host))
err = mmc_deselect_cards(host);
host->card->state &= ~MMC_STATE_HIGHSPEED;
mmc_release_host(host);
return err;
}
/*
* Resume callback from host.
*
* This function tries to determine if the same card is still present
* and, if so, restore all state to it.
*/
static int mmc_sd_resume(struct mmc_host *host)
{
int err;
BUG_ON(!host);
BUG_ON(!host->card);
mmc_claim_host(host);
err = mmc_sd_init_card(host, host->ocr, host->card);
mmc_release_host(host);
return err;
}
static int mmc_sd_power_restore(struct mmc_host *host)
{
int ret;
host->card->state &= ~MMC_STATE_HIGHSPEED;
mmc_claim_host(host);
ret = mmc_sd_init_card(host, host->ocr, host->card);
mmc_release_host(host);
return ret;
}
static const struct mmc_bus_ops mmc_sd_ops = {
.remove = mmc_sd_remove,
.detect = mmc_sd_detect,
.suspend = NULL,
.resume = NULL,
.power_restore = mmc_sd_power_restore,
.alive = mmc_sd_alive,
};
static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
.remove = mmc_sd_remove,
.detect = mmc_sd_detect,
.suspend = mmc_sd_suspend,
.resume = mmc_sd_resume,
.power_restore = mmc_sd_power_restore,
.alive = mmc_sd_alive,
};
static void mmc_sd_attach_bus_ops(struct mmc_host *host)
{
const struct mmc_bus_ops *bus_ops;
if (!mmc_card_is_removable(host))
bus_ops = &mmc_sd_ops_unsafe;
else
bus_ops = &mmc_sd_ops;
mmc_attach_bus(host, bus_ops);
}
/*
* Starting point for SD card init.
*/
int mmc_attach_sd(struct mmc_host *host)
{
int err;
u32 ocr;
BUG_ON(!host);
WARN_ON(!host->claimed);
/* Disable preset value enable if already set since last time */
if (host->ops->enable_preset_value) {
mmc_host_clk_hold(host);
host->ops->enable_preset_value(host, false);
mmc_host_clk_release(host);
}
err = mmc_send_app_op_cond(host, 0, &ocr);
if (err)
return err;
mmc_sd_attach_bus_ops(host);
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;
}
/*
* Sanity check the voltages that the card claims to
* support.
*/
if (ocr & 0x7F) {
pr_warning("%s: card claims to support voltages "
"below the defined range. These will be ignored.\n",
mmc_hostname(host));
ocr &= ~0x7F;
}
if ((ocr & MMC_VDD_165_195) &&
!(host->ocr_avail_sd & MMC_VDD_165_195)) {
pr_warning("%s: SD card claims to support the "
"incompletely defined 'low voltage range'. This "
"will be ignored.\n", mmc_hostname(host));
ocr &= ~MMC_VDD_165_195;
}
host->ocr = mmc_select_voltage(host, ocr);
/*
* Can we support the voltage(s) of the card(s)?
*/
if (!host->ocr) {
err = -EINVAL;
goto err;
}
/*
* Detect and init the card.
*/
err = mmc_sd_init_card(host, host->ocr, 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);
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;
}
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