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drivers: mmc: add driver for Microchip PIC32 SDHCI controller.

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This driver implements platform specific glue and fixups for
PIC32 internal SDHCI controller.

Signed-off-by: Andrei Pistirica <andrei.pistirica@microchip.com>
Signed-off-by: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun@microchip.com>
Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
This commit is contained in:
Andrei Pistirica 2016-01-28 15:30:18 +05:30 committed by Daniel Schwierzeck
parent 44da3a176c
commit 102142c9e0
4 changed files with 72 additions and 1 deletions
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6
drivers/mmc/Kconfig
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@ -31,4 +31,10 @@ config SH_SDHI
help
Support for the on-chip SDHI host controller on SuperH/Renesas ARM SoCs platform
config PIC32_SDHCI
bool "Microchip PIC32 on-chip SDHCI support"
depends on DM_MMC && MACH_PIC32
help
Support for Microchip PIC32 SDHCI controller.
endmenu

2
drivers/mmc/Makefile
View File

@ -48,4 +48,4 @@ obj-$(CONFIG_SPL_MMC_BOOT) += fsl_esdhc_spl.o
else
obj-$(CONFIG_GENERIC_MMC) += mmc_write.o
endif
obj-$(CONFIG_PIC32_SDHCI) += pic32_sdhci.o

58
drivers/mmc/pic32_sdhci.c Normal file
View File

@ -0,0 +1,58 @@
/*
* Support of SDHCI for Microchip PIC32 SoC.
*
* Copyright (C) 2015 Microchip Technology Inc.
* Andrei Pistirica <andrei.pistirica@microchip.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <dm.h>
#include <common.h>
#include <sdhci.h>
#include <asm/errno.h>
#include <mach/pic32.h>
DECLARE_GLOBAL_DATA_PTR;
static int pic32_sdhci_probe(struct udevice *dev)
{
struct sdhci_host *host = dev_get_priv(dev);
const void *fdt = gd->fdt_blob;
u32 f_min_max[2];
fdt_addr_t addr;
fdt_size_t size;
int ret;
addr = fdtdec_get_addr_size(fdt, dev->of_offset, "reg", &size);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
host->ioaddr = ioremap(addr, size);
host->name = (char *)dev->name;
host->quirks = SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_NO_CD;
host->bus_width = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
"bus-width", 4);
ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset,
"clock-freq-min-max", f_min_max, 2);
if (ret) {
printf("sdhci: clock-freq-min-max not found\n");
return ret;
}
return add_sdhci(host, f_min_max[1], f_min_max[0]);
}
static const struct udevice_id pic32_sdhci_ids[] = {
{ .compatible = "microchip,pic32mzda-sdhci" },
{ }
};
U_BOOT_DRIVER(pic32_sdhci_drv) = {
.name = "pic32_sdhci",
.id = UCLASS_MMC,
.of_match = pic32_sdhci_ids,
.probe = pic32_sdhci_probe,
.priv_auto_alloc_size = sizeof(struct sdhci_host),
};

7
drivers/mmc/sdhci.c
View File

@ -443,6 +443,12 @@ static int sdhci_init(struct mmc *mmc)
sdhci_set_power(host, fls(mmc->cfg->voltages) - 1);
if (host->quirks & SDHCI_QUIRK_NO_CD) {
#if defined(CONFIG_PIC32_SDHCI)
/* PIC32 SDHCI CD errata:
* - set CD_TEST and clear CD_TEST_INS bit
*/
sdhci_writeb(host, SDHCI_CTRL_CD_TEST, SDHCI_HOST_CONTROL);
#else
unsigned int status;
sdhci_writeb(host, SDHCI_CTRL_CD_TEST_INS | SDHCI_CTRL_CD_TEST,
@ -453,6 +459,7 @@ static int sdhci_init(struct mmc *mmc)
(!(status & SDHCI_CARD_STATE_STABLE)) ||
(!(status & SDHCI_CARD_DETECT_PIN_LEVEL)))
status = sdhci_readl(host, SDHCI_PRESENT_STATE);
#endif
}
/* Enable only interrupts served by the SD controller */