diff options
Diffstat (limited to 'drivers/mmc/msm_sdhci.c')
| -rw-r--r-- | drivers/mmc/msm_sdhci.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/drivers/mmc/msm_sdhci.c b/drivers/mmc/msm_sdhci.c new file mode 100644 index 0000000000..1e2a29b825 --- /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), +}; |