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

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>

drivers/mmc/Kconfig

@@ -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

drivers/mmc/Makefile

@@ -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

drivers/mmc/pic32_sdhci.c

@@ -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),
+};

drivers/mmc/sdhci.c

@@ -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 */