From: Andrei Pistirica andrei.pistirica@microchip.com
This driver implements platform specific glue and fix-ups for SDHCI host controller.
Signed-off-by: Andrei Pistirica andrei.pistirica@microchip.com Signed-off-by: Purna Chandra Mandal purna.mandal@microchip.com ---
drivers/mmc/Kconfig | 6 +++ drivers/mmc/Makefile | 2 +- drivers/mmc/pic32_sdhci.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 117 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..4fe0825 --- /dev/null +++ b/drivers/mmc/pic32_sdhci.c @@ -0,0 +1,110 @@ +/* + * Support of SDHCI devices for Microchip PIC32 SoC. + * + * Copyright (C) 2015 Microchip Technology Inc. + * Andrei Pistirica andrei.pistirica@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <malloc.h> +#include <sdhci.h> +#include <asm/errno.h> +#include <asm/arch-pic32/pic32.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* SDHCI capabilities bits */ +#define SDHCI_CAPS_SLOT_TYPE_MASK 0xC0000000 +#define SLOT_TYPE_REMOVABLE 0x0 +#define SLOT_TYPE_EMBEDDED 0x1 +#define SLOT_TYPE_SHARED_BUS 0x2 + +/* SDHCI Shared Bus Control */ +#define SDHCI_SHARED_BUS_CTRL 0xE0 +#define SDHCI_SHARED_BUS_NR_CLK_PINS_MASK 0x7 +#define SDHCI_SHARED_BUS_NR_IRQ_PINS_MASK 0x30 +#define SDHCI_SHARED_BUS_CLK_PINS 0x10 +#define SDHCI_SHARED_BUS_IRQ_PINS 0x14 + +static int pic32_sdhci_set_shared(struct sdhci_host *host, u32 clk, u32 irq) +{ + unsigned int caps; + u32 bus, caps_slot_type; + u32 clk_pins, irq_pins; + + /* Card slot connected on shared bus? */ + caps = sdhci_readl(host, SDHCI_CAPABILITIES); + caps_slot_type = ((caps & SDHCI_CAPS_SLOT_TYPE_MASK) >> 30); + if (caps_slot_type != SLOT_TYPE_SHARED_BUS) + return 0; + + bus = sdhci_readl(host, SDHCI_SHARED_BUS_CTRL); + clk_pins = (bus & SDHCI_SHARED_BUS_NR_CLK_PINS_MASK) >> 0; + irq_pins = (bus & SDHCI_SHARED_BUS_NR_IRQ_PINS_MASK) >> 4; + + /* Select first clock */ + if (clk_pins & clk) + bus |= (clk << SDHCI_SHARED_BUS_CLK_PINS); + + /* Select first interrupt */ + if (irq_pins & irq) + bus |= (irq << SDHCI_SHARED_BUS_IRQ_PINS); + + sdhci_writel(host, bus, SDHCI_SHARED_BUS_CTRL); + return 0; +} + +static int pic32_sdhci_probe(struct udevice *dev) +{ + struct sdhci_host *host = dev_get_priv(dev); + u32 minmax[2], shared_clk_irq[2]; + int ret; + + ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, + "clock-freq-min-max", minmax, 2); + if (ret) + goto _out; + + ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, + "clock-irq-pins", shared_clk_irq, 2); + if (!ret) + ret = pic32_sdhci_set_shared(host, shared_clk_irq[1], + shared_clk_irq[0]); + + if (ret) + goto _out; + + return add_sdhci(host, minmax[1], minmax[0]); + +_out: + return ret; +} + + +static int pic32_sdhci_ofdata_to_platdata(struct udevice *dev) +{ + struct sdhci_host *host = dev_get_priv(dev); + + host->name = (char *)dev->name; + host->ioaddr = (void *)dev_get_addr(dev); + 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), +};