[U-Boot] [PATCH v3 10/14] drivers: mmc: add driver for Microchip PIC32 SDHCI controller.

Purna Chandra Mandal
2016-01-12T10:18:25Z

From: Andrei Pistirica <andrei.pistirica@microchip.com>

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>

---

Changes in v3:
- remove ofdata_to_platdata, and replace platdata with priv
- replace pic32_ioremap() with ioremap()

Changes in v2:
- drop sdhci shared bus configuration (for shared interrupt, clock pins)

drivers/mmc/Kconfig | 6 +++++
drivers/mmc/Makefile | 2 +-
drivers/mmc/pic32_sdhci.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/mmc/sdhci.c | 12 ++++++++++
4 files changed, 80 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..f8a5a23
--- /dev/null
+++ b/drivers/mmc/pic32_sdhci.c
@@ -0,0 +1,61 @@
+/*
+ * 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);
+ if (!host->ioaddr)
+ return -EINVAL;
+
+ host->name = (char *)dev->name;
+ host->quirks = SDHCI_QUIRK_NO_HISPD_BIT;
+ 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),
+};
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