mmc: sdhci-pci: add eMMC hardware reset support
Implement eMMC hardware reset for Medfield. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
parent
20758b66dc
commit
0f2016558e
|
@ -21,6 +21,8 @@
|
|||
#include <linux/mmc/host.h>
|
||||
#include <linux/scatterlist.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/gpio.h>
|
||||
#include <linux/sfi.h>
|
||||
|
||||
#include "sdhci.h"
|
||||
|
||||
|
@ -59,6 +61,7 @@ struct sdhci_pci_slot {
|
|||
struct sdhci_host *host;
|
||||
|
||||
int pci_bar;
|
||||
int rst_n_gpio;
|
||||
};
|
||||
|
||||
struct sdhci_pci_chip {
|
||||
|
@ -163,12 +166,63 @@ static int mrst_hc_probe(struct sdhci_pci_chip *chip)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/* Medfield eMMC hardware reset GPIOs */
|
||||
static int mfd_emmc0_rst_gpio = -EINVAL;
|
||||
static int mfd_emmc1_rst_gpio = -EINVAL;
|
||||
|
||||
static int mfd_emmc_gpio_parse(struct sfi_table_header *table)
|
||||
{
|
||||
struct sfi_table_simple *sb = (struct sfi_table_simple *)table;
|
||||
struct sfi_gpio_table_entry *entry;
|
||||
int i, num;
|
||||
|
||||
num = SFI_GET_NUM_ENTRIES(sb, struct sfi_gpio_table_entry);
|
||||
entry = (struct sfi_gpio_table_entry *)sb->pentry;
|
||||
|
||||
for (i = 0; i < num; i++, entry++) {
|
||||
if (!strncmp(entry->pin_name, "emmc0_rst", SFI_NAME_LEN))
|
||||
mfd_emmc0_rst_gpio = entry->pin_no;
|
||||
else if (!strncmp(entry->pin_name, "emmc1_rst", SFI_NAME_LEN))
|
||||
mfd_emmc1_rst_gpio = entry->pin_no;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mfd_emmc_probe_slot(struct sdhci_pci_slot *slot)
|
||||
{
|
||||
const char *name = NULL;
|
||||
int gpio = -EINVAL;
|
||||
|
||||
sfi_table_parse(SFI_SIG_GPIO, NULL, NULL, mfd_emmc_gpio_parse);
|
||||
|
||||
switch (slot->chip->pdev->device) {
|
||||
case PCI_DEVICE_ID_INTEL_MFD_EMMC0:
|
||||
gpio = mfd_emmc0_rst_gpio;
|
||||
name = "eMMC0_reset";
|
||||
break;
|
||||
case PCI_DEVICE_ID_INTEL_MFD_EMMC1:
|
||||
gpio = mfd_emmc1_rst_gpio;
|
||||
name = "eMMC1_reset";
|
||||
break;
|
||||
}
|
||||
|
||||
if (!gpio_request(gpio, name)) {
|
||||
gpio_direction_output(gpio, 1);
|
||||
slot->rst_n_gpio = gpio;
|
||||
slot->host->mmc->caps |= MMC_CAP_HW_RESET;
|
||||
}
|
||||
|
||||
slot->host->mmc->caps |= MMC_CAP_8_BIT_DATA;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void mfd_emmc_remove_slot(struct sdhci_pci_slot *slot, int dead)
|
||||
{
|
||||
gpio_free(slot->rst_n_gpio);
|
||||
}
|
||||
|
||||
static const struct sdhci_pci_fixes sdhci_intel_mrst_hc0 = {
|
||||
.quirks = SDHCI_QUIRK_BROKEN_ADMA | SDHCI_QUIRK_NO_HISPD_BIT,
|
||||
.probe_slot = mrst_hc_probe_slot,
|
||||
|
@ -190,6 +244,7 @@ static const struct sdhci_pci_fixes sdhci_intel_mfd_sdio = {
|
|||
static const struct sdhci_pci_fixes sdhci_intel_mfd_emmc = {
|
||||
.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
|
||||
.probe_slot = mfd_emmc_probe_slot,
|
||||
.remove_slot = mfd_emmc_remove_slot,
|
||||
};
|
||||
|
||||
/* O2Micro extra registers */
|
||||
|
@ -832,9 +887,25 @@ static int sdhci_pci_8bit_width(struct sdhci_host *host, int width)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static void sdhci_pci_hw_reset(struct sdhci_host *host)
|
||||
{
|
||||
struct sdhci_pci_slot *slot = sdhci_priv(host);
|
||||
int rst_n_gpio = slot->rst_n_gpio;
|
||||
|
||||
if (!gpio_is_valid(rst_n_gpio))
|
||||
return;
|
||||
gpio_set_value_cansleep(rst_n_gpio, 0);
|
||||
/* For eMMC, minimum is 1us but give it 10us for good measure */
|
||||
udelay(10);
|
||||
gpio_set_value_cansleep(rst_n_gpio, 1);
|
||||
/* For eMMC, minimum is 200us but give it 300us for good measure */
|
||||
usleep_range(300, 1000);
|
||||
}
|
||||
|
||||
static struct sdhci_ops sdhci_pci_ops = {
|
||||
.enable_dma = sdhci_pci_enable_dma,
|
||||
.platform_8bit_width = sdhci_pci_8bit_width,
|
||||
.hw_reset = sdhci_pci_hw_reset,
|
||||
};
|
||||
|
||||
/*****************************************************************************\
|
||||
|
@ -988,6 +1059,7 @@ static struct sdhci_pci_slot * __devinit sdhci_pci_probe_slot(
|
|||
slot->chip = chip;
|
||||
slot->host = host;
|
||||
slot->pci_bar = bar;
|
||||
slot->rst_n_gpio = -EINVAL;
|
||||
|
||||
host->hw_name = "PCI";
|
||||
host->ops = &sdhci_pci_ops;
|
||||
|
|
Loading…
Reference in a new issue