[U-Boot] [PATCH v2 08/13] drivers: mmc: add driver for Microchip PIC32 SDHCI controller.

[Purna Chandra Mandal]

PIC32 architecture has in-built SDHCI controller. This driver implements
platform specific glue to use common SDHCI functionality.

Signed-off-by: Andrei Pistirica <andrei.pistirica at microchip.com>
Signed-off-by: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun at microchip.com>
Signed-off-by: Purna Chandra Mandal <purna.mandal at microchip.com>

---

Changes in v2:
- drop SDHCI shared bus configuration (for shared interrupt-and-clock pins)

 drivers/mmc/Kconfig       |  6 +++++
 drivers/mmc/Makefile      |  2 +-
 drivers/mmc/pic32_sdhci.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++
 drivers/mmc/sdhci.c       | 12 +++++++++
 4 files changed, 82 insertions(+), 1 deletion(-)
 create mode 100644 drivers/mmc/pic32_sdhci.c

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index ceae7bc..0b6f54b 100644
--- a/drivers/mmc/Kconfig
+++ b/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 the on-chip SDHCI support on Microchip PIC32 platforms.
+
 endmenu
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 5d35705..c9c3e3e 100644
--- a/drivers/mmc/Makefile
+++ b/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
diff --git a/drivers/mmc/pic32_sdhci.c b/drivers/mmc/pic32_sdhci.c
new file mode 100644
index 0000000..9eb603e
--- /dev/null
+++ b/drivers/mmc/pic32_sdhci.c
@@ -0,0 +1,63 @@
+/*
+ * Support of SDHCI for Microchip PIC32 SoC.
+ *
+ * Copyright (C) 2015 Microchip Technology Inc.
+ * Andrei Pistirica <andrei.pistirica at 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);
+	u32 f_min_max[2];
+	int ret;
+
+	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 int pic32_sdhci_ofdata_to_platdata(struct udevice *dev)
+{
+	struct sdhci_host *host = dev_get_priv(dev);
+	fdt_addr_t addr;
+
+	addr = dev_get_addr(dev);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	host->name	= (char *)dev->name;
+	host->ioaddr	= pic32_ioremap(addr);
+	host->quirks	= SDHCI_QUIRK_NO_HISPD_BIT;
+	host->bus_width	= fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+					"bus-width", 4);
+	return 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,
+	.ofdata_to_platdata	= pic32_sdhci_ofdata_to_platdata,
+	.priv_auto_alloc_size	= sizeof(struct sdhci_host),
+};
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 02d71b9..f32fe67 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -424,6 +424,18 @@ static void sdhci_set_ios(struct mmc *mmc)
 	if (host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)
 		ctrl &= ~SDHCI_CTRL_HISPD;
 
+#if defined(CONFIG_PIC32_SDHCI)
+	/*
+	* In PIC32MZ[DA] due to h/w bug SDHCI fails detecting card when JTAG
+	* is not connected.
+	* To work-around this problem:
+	*  - set Card_Detect_Signal_Selection bit in SDHCI_Host_Control register
+	*  - clear Card_Detect_Test_Level bit in SDHCI_Host_Control register
+	*/
+	ctrl |= SDHCI_CTRL_CD_TEST;
+	ctrl &= ~SDHCI_CTRL_CD_TEST_INS;
+#endif
+
 	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 }
 
-- 
1.8.3.1