[U-Boot] [RFC PATCH 03/11] mmc: Add support for Qualcomm SDHCI controller
Mateusz Kulikowski
mateusz.kulikowski at gmail.com
Thu Dec 10 22:41:39 CET 2015
Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
---
drivers/mmc/Kconfig | 6 ++
drivers/mmc/Makefile | 1 +
drivers/mmc/msm_sdhci.c | 149 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 156 insertions(+)
create mode 100644 drivers/mmc/msm_sdhci.c
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index ceae7bc..3f75fa7 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -16,6 +16,12 @@ 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 manufactured by Qualcomm.
+
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..96119f0
--- /dev/null
+++ b/drivers/mmc/msm_sdhci.c
@@ -0,0 +1,149 @@
+/*
+ * Qualcomm SDHCI driver - SD/eMMC controller
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
+ *
+ * Based on Linux driver
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <asm/io.h>
+#include <common.h>
+#include <dm.h>
+#include <linux/bitops.h>
+#include <sdhci.h>
+#include <clk.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_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;
+ phys_addr_t base;
+ unsigned width;
+};
+
+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 */
+ fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "clock", clkd, 2);
+ clkd[0] = fdt_node_offset_by_phandle(gd->fdt_blob, clkd[0]);
+
+ struct udevice *clk = NULL;
+ uclass_get_device_by_of_offset(UCLASS_CLK, clkd[0], &clk);
+ if (clk)
+ clk_set_periph_rate(clk, clkd[1], clk_rate);
+
+ 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;
+
+ host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_BROKEN_R1B;
+
+ /* Init clocks */
+ if (msm_sdc_clk_init(dev))
+ return -EIO;
+
+ /* Reset the core and Enable SDHC mode */
+ writel(readl(prv->base + SDCC_MCI_POWER) | SDCC_MCI_POWER_SW_RST,
+ prv->base + SDCC_MCI_POWER);
+
+ /* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */
+ mdelay(2);
+
+ if (readl(prv->base + SDCC_MCI_POWER) & SDCC_MCI_POWER_SW_RST) {
+ printf("msm_sdhci: stuck in reset\n");
+ return -1;
+ }
+
+ /* 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 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 = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
+ dev->parent->of_offset,
+ dev->of_offset, "reg",
+ 1, NULL);
+ 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),
+};
--
2.5.0
More information about the U-Boot
mailing list