Add support for SD/eMMC controller present on some Qualcomm Snapdragon devices. This controller implements SDHCI 2.0 interface but requires vendor-specific initialization. Driver works in PIO mode as ADMA is not supported by U-Boot (yet).
Signed-off-by: Mateusz Kulikowski mateusz.kulikowski@gmail.com ---
Changes in v1: - Added commit message - Added DT binding documentation - Added Kconfig help - Reordered includes - Dropped redundant fields from msm_sdhc - Cleaned up clock init code (+ added error handling) - Dropped mdelay - use wait_for_bit instead in reset code - Added missing newline after declarations - Added error handling if "reg" is missing - Converted base address to pointer
doc/device-tree-bindings/mmc/msm_sdhci.txt | 25 ++++ drivers/mmc/Kconfig | 9 ++ drivers/mmc/Makefile | 1 + drivers/mmc/msm_sdhci.c | 180 +++++++++++++++++++++++++++++ 4 files changed, 215 insertions(+) create mode 100644 doc/device-tree-bindings/mmc/msm_sdhci.txt create mode 100644 drivers/mmc/msm_sdhci.c
diff --git a/doc/device-tree-bindings/mmc/msm_sdhci.txt b/doc/device-tree-bindings/mmc/msm_sdhci.txt new file mode 100644 index 0000000..08a290c --- /dev/null +++ b/doc/device-tree-bindings/mmc/msm_sdhci.txt @@ -0,0 +1,25 @@ +Qualcomm Snapdragon SDHCI controller + +Required properties: +- compatible : "qcom,sdhci-msm-v4" +- reg: Base address and length of registers: + - Host controller registers (SDHCI) + - SD Core registers +- clock: interface clock (must accept SD bus clock as a frequency) + +Optional properties: +- index: If there is more than one controller - controller index (required + by generic SDHCI code). +- bus_width: Width of SD/eMMC bus (default 4) +- clock-frequency: Frequency of SD/eMMC bus (default 400 kHz) + +Example: + +sdhci@07864000 { + compatible = "qcom,sdhci-msm-v4"; + reg = <0x7864900 0x11c 0x7864000 0x800>; + index = <0x1>; + bus-width = <0x4>; + clock = <&clkc 1>; + clock-frequency = <200000000>; +}; diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index ceae7bc..280f015 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -16,6 +16,15 @@ config DM_MMC appear as block devices in U-Boot and can support filesystems such as EXT4 and FAT.
+config MSM_SDHCI + bool "Qualcomm SDHCI controller" + depends on DM_MMC + help + Enables support for SDHCI 2.0 controller present on some Qualcomm + Snapdragon devices. This device is compatible with eMMC v4.5 and + SD 3.0 specifications. Both SD and eMMC devices are supported. + Card-detect gpios are not supported. + config ROCKCHIP_DWMMC bool "Rockchip SD/MMC controller support" depends on DM_MMC && OF_CONTROL diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile index 5d35705..f4fdfca 100644 --- a/drivers/mmc/Makefile +++ b/drivers/mmc/Makefile @@ -49,3 +49,4 @@ else obj-$(CONFIG_GENERIC_MMC) += mmc_write.o endif
+obj-$(CONFIG_MSM_SDHCI) += msm_sdhci.o diff --git a/drivers/mmc/msm_sdhci.c b/drivers/mmc/msm_sdhci.c new file mode 100644 index 0000000..1e2a29b --- /dev/null +++ b/drivers/mmc/msm_sdhci.c @@ -0,0 +1,180 @@ +/* + * Qualcomm SDHCI driver - SD/eMMC controller + * + * (C) Copyright 2015 Mateusz Kulikowski mateusz.kulikowski@gmail.com + * + * Based on Linux driver + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <clk.h> +#include <dm.h> +#include <sdhci.h> +#include <wait_bit.h> +#include <asm/io.h> +#include <linux/bitops.h> + +/* Non-standard registers needed for SDHCI startup */ +#define SDCC_MCI_POWER 0x0 +#define SDCC_MCI_POWER_SW_RST BIT(7) + +/* This is undocumented register */ +#define SDCC_MCI_VERSION 0x50 +#define SDCC_MCI_VERSION_MAJOR_SHIFT 28 +#define SDCC_MCI_VERSION_MAJOR_MASK (0xf << SDCC_MCI_VERSION_MAJOR_SHIFT) +#define SDCC_MCI_VERSION_MINOR_MASK 0xff + +#define SDCC_MCI_STATUS2 0x6C +#define SDCC_MCI_STATUS2_MCI_ACT 0x1 +#define SDCC_MCI_HC_MODE 0x78 + +/* Offset to SDHCI registers */ +#define SDCC_SDHCI_OFFSET 0x900 + +/* Non standard (?) SDHCI register */ +#define SDHCI_VENDOR_SPEC_CAPABILITIES0 0x11c + +struct msm_sdhc { + struct sdhci_host host; + void *base; +}; + +DECLARE_GLOBAL_DATA_PTR; + +static int msm_sdc_clk_init(struct udevice *dev) +{ + uint clk_rate = fdtdec_get_uint(gd->fdt_blob, dev->of_offset, + "clock-frequency", 400000); + uint clkd[2]; /* clk_id and clk_no */ + int clk_offset; + struct udevice *clk; + int ret; + + ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "clock", clkd, + 2); + if (ret) + return ret; + + clk_offset = fdt_node_offset_by_phandle(gd->fdt_blob, clkd[0]); + if (clk_offset < 0) + return clk_offset; + + ret = uclass_get_device_by_of_offset(UCLASS_CLK, clk_offset, &clk); + if (ret) + return ret; + + ret = clk_set_periph_rate(clk, clkd[1], clk_rate); + if (ret < 0) + return ret; + + return 0; +} + +static int msm_sdc_probe(struct udevice *dev) +{ + struct msm_sdhc *prv = dev_get_priv(dev); + struct sdhci_host *host = &prv->host; + u32 core_version, core_minor, core_major; + int ret; + + host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_BROKEN_R1B; + + /* Init clocks */ + ret = msm_sdc_clk_init(dev); + if (ret) + return ret; + + /* Reset the core and Enable SDHC mode */ + writel(readl(prv->base + SDCC_MCI_POWER) | SDCC_MCI_POWER_SW_RST, + prv->base + SDCC_MCI_POWER); + + + /* Wait for reset to be written to register */ + if (wait_for_bit(__func__, prv->base + SDCC_MCI_STATUS2, + SDCC_MCI_STATUS2_MCI_ACT, false, 10, false)) { + printf("msm_sdhci: reset request failed\n"); + return -EIO; + } + + /* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */ + if (wait_for_bit(__func__, prv->base + SDCC_MCI_POWER, + SDCC_MCI_POWER_SW_RST, false, 2, false)) { + printf("msm_sdhci: stuck in reset\n"); + return -ETIMEDOUT; + } + + /* Enable host-controller mode */ + writel(1, prv->base + SDCC_MCI_HC_MODE); + + core_version = readl(prv->base + SDCC_MCI_VERSION); + + core_major = (core_version & SDCC_MCI_VERSION_MAJOR_MASK); + core_major >>= SDCC_MCI_VERSION_MAJOR_SHIFT; + + core_minor = core_version & SDCC_MCI_VERSION_MINOR_MASK; + + /* + * Support for some capabilities is not advertised by newer + * controller versions and must be explicitly enabled. + */ + if (core_major >= 1 && core_minor != 0x11 && core_minor != 0x12) { + u32 caps = readl(host->ioaddr + SDHCI_CAPABILITIES); + caps |= SDHCI_CAN_VDD_300 | SDHCI_CAN_DO_8BIT; + writel(caps, host->ioaddr + SDHCI_VENDOR_SPEC_CAPABILITIES0); + } + + /* Set host controller version */ + host->version = sdhci_readw(host, SDHCI_HOST_VERSION); + + /* automatically detect max and min speed */ + return add_sdhci(host, 0, 0); +} + +static int msm_sdc_remove(struct udevice *dev) +{ + struct msm_sdhc *priv = dev_get_priv(dev); + + /* Disable host-controller mode */ + writel(0, priv->base + SDCC_MCI_HC_MODE); + + return 0; +} + +static int msm_ofdata_to_platdata(struct udevice *dev) +{ + struct udevice *parent = dev->parent; + struct msm_sdhc *priv = dev_get_priv(dev); + struct sdhci_host *host = &priv->host; + + host->name = strdup(dev->name); + host->ioaddr = (void *)dev_get_addr(dev); + host->bus_width = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "bus-width", 4); + host->index = fdtdec_get_uint(gd->fdt_blob, dev->of_offset, "index", 0); + priv->base = (void *)fdtdec_get_addr_size_auto_parent(gd->fdt_blob, + parent->of_offset, + dev->of_offset, + "reg", 1, NULL); + if (priv->base == (void *)FDT_ADDR_T_NONE || + host->ioaddr == (void *)FDT_ADDR_T_NONE) + return -EINVAL; + + return 0; +} + +static const struct udevice_id msm_mmc_ids[] = { + { .compatible = "qcom,sdhci-msm-v4" }, + { } +}; + +U_BOOT_DRIVER(msm_sdc_drv) = { + .name = "msm_sdc", + .id = UCLASS_MMC, + .of_match = msm_mmc_ids, + .ofdata_to_platdata = msm_ofdata_to_platdata, + .probe = msm_sdc_probe, + .remove = msm_sdc_remove, + .priv_auto_alloc_size = sizeof(struct msm_sdhc), +};