mmc: ca_dw_mmc: add DesignWare based DM support for CAxxxx SoCs

Initial DesignWare based DM support for Cortina Access CAxxxx SoCs.

Signed-off-by: Arthur Li <arthur.li@cortina-access.com>
Signed-off-by: Alex Nemirovsky <alex.nemirovsky@cortina-access.com>

MAINTAINERS

@@ -180,6 +180,7 @@ F:	board/cortina/common/
 F:	drivers/gpio/cortina_gpio.c
 F:	drivers/watchdog/cortina_wdt.c
 F:	drivers/serial/serial_cortina.c
+F:	drivers/mmc/ca_dw_mmc.c
 
 ARM/CZ.NIC TURRIS MOX SUPPORT
 M:	Marek Behun <marek.behun@nic.cz>
@@ -672,6 +673,7 @@ F:	board/cortina/common/
 F:	drivers/gpio/cortina_gpio.c
 F:	drivers/watchdog/cortina_wdt.c
 F:	drivers/serial/serial_cortina.c
+F:	drivers/mmc/ca_dw_mmc.c
 
 MIPS MSCC
 M:	Gregory CLEMENT <gregory.clement@bootlin.com>

drivers/mmc/Kconfig

@@ -205,6 +205,17 @@ config MMC_DW
 	  block, this provides host support for SD and MMC interfaces, in both
 	  PIO, internal DMA mode and external DMA mode.
 
+config MMC_DW_CORTINA
+	bool "Cortina specific extensions for Synopsys DW Memory Card Interface"
+	depends on DM_MMC
+	depends on MMC_DW
+	depends on BLK
+	default n
+	help
+	  This selects support for Cortina SoC specific extensions to the
+	  Synopsys DesignWare Memory Card Interface driver. Select this option
+	  for platforms based on Cortina CAxxxx Soc's.
+
 config MMC_DW_EXYNOS
 	bool "Exynos specific extensions for Synopsys DW Memory Card Interface"
 	depends on ARCH_EXYNOS

drivers/mmc/Makefile

@@ -20,6 +20,7 @@ endif
 obj-$(CONFIG_ARM_PL180_MMCI) += arm_pl180_mmci.o
 obj-$(CONFIG_MMC_DAVINCI)		+= davinci_mmc.o
 obj-$(CONFIG_MMC_DW)			+= dw_mmc.o
+obj-$(CONFIG_MMC_DW_CORTINA)		+= ca_dw_mmc.o
 obj-$(CONFIG_MMC_DW_EXYNOS)		+= exynos_dw_mmc.o
 obj-$(CONFIG_MMC_DW_K3)			+= hi6220_dw_mmc.o
 obj-$(CONFIG_MMC_DW_ROCKCHIP)		+= rockchip_dw_mmc.o

drivers/mmc/ca_dw_mmc.c

@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2019 Cortina Access
+ * Arthur Li <arthur.li@cortina-access.com>
+ */
+
+#include <common.h>
+#include <dwmmc.h>
+#include <fdtdec.h>
+#include <linux/libfdt.h>
+#include <malloc.h>
+#include <errno.h>
+#include <dm.h>
+#include <mapmem.h>
+
+#define SD_CLK_SEL_MASK (0x3)
+#define SD_DLL_DEFAULT  (0x143000)
+#define SD_SCLK_MAX (200000000)
+
+#define SD_CLK_SEL_200MHZ (0x2)
+#define SD_CLK_SEL_100MHZ (0x1)
+
+#define IO_DRV_SD_DS_OFFSET (16)
+#define IO_DRV_SD_DS_MASK   (0xff << IO_DRV_SD_DS_OFFSET)
+
+#define MIN_FREQ (400000)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct ca_mmc_plat {
+	struct mmc_config cfg;
+	struct mmc mmc;
+};
+
+struct ca_dwmmc_priv_data {
+	struct dwmci_host host;
+	void __iomem *sd_dll_reg;
+	void __iomem *io_drv_reg;
+	u8 ds;
+};
+
+static void ca_dwmci_clksel(struct dwmci_host *host)
+{
+	struct ca_dwmmc_priv_data *priv = host->priv;
+	u32 val = readl(priv->sd_dll_reg);
+
+	if (host->bus_hz >= 200000000) {
+		val &= ~SD_CLK_SEL_MASK;
+		val |= SD_CLK_SEL_200MHZ;
+	} else if (host->bus_hz >= 100000000) {
+		val &= ~SD_CLK_SEL_MASK;
+		val |= SD_CLK_SEL_100MHZ;
+	} else {
+		val &= ~SD_CLK_SEL_MASK;
+	}
+
+	writel(val, priv->sd_dll_reg);
+}
+
+static void ca_dwmci_board_init(struct dwmci_host *host)
+{
+	struct ca_dwmmc_priv_data *priv = host->priv;
+	u32 val = readl(priv->io_drv_reg);
+
+	writel(SD_DLL_DEFAULT, priv->sd_dll_reg);
+
+	val &= ~IO_DRV_SD_DS_MASK;
+	if (priv && priv->ds)
+		val |= priv->ds << IO_DRV_SD_DS_OFFSET;
+	writel(val, priv->io_drv_reg);
+}
+
+unsigned int ca_dwmci_get_mmc_clock(struct dwmci_host *host, uint freq)
+{
+	struct ca_dwmmc_priv_data *priv = host->priv;
+	u8 sd_clk_sel = readl(priv->sd_dll_reg) & SD_CLK_SEL_MASK;
+	u8 clk_div;
+
+	switch (sd_clk_sel) {
+	case 2:
+		clk_div = 1;
+		break;
+	case 1:
+		clk_div = 2;
+		break;
+	default:
+		clk_div = 4;
+	}
+
+	return SD_SCLK_MAX / clk_div / (host->div + 1);
+}
+
+static int ca_dwmmc_ofdata_to_platdata(struct udevice *dev)
+{
+	struct ca_dwmmc_priv_data *priv = dev_get_priv(dev);
+	struct dwmci_host *host = &priv->host;
+	u32 tmp;
+
+	host->name = dev->name;
+	host->dev_index = 0;
+
+	host->buswidth = dev_read_u32_default(dev, "bus-width", 1);
+	if (host->buswidth != 1 && host->buswidth != 4)
+		return -EINVAL;
+
+	host->bus_hz = dev_read_u32_default(dev, "max-frequency", 50000000);
+	priv->ds = dev_read_u32_default(dev, "io_ds", 0x33);
+	host->fifo_mode = dev_read_bool(dev, "fifo-mode");
+
+	dev_read_u32(dev, "sd_dll_ctrl", &tmp);
+	priv->sd_dll_reg = map_sysmem((uintptr_t)tmp, sizeof(uintptr_t));
+	if (!priv->sd_dll_reg)
+		return -EINVAL;
+
+	dev_read_u32(dev, "io_drv_ctrl", &tmp);
+	priv->io_drv_reg = map_sysmem((uintptr_t)tmp, sizeof(uintptr_t));
+	if (!priv->io_drv_reg)
+		return -EINVAL;
+
+	host->ioaddr = dev_read_addr_ptr(dev);
+	if (host->ioaddr == (void *)FDT_ADDR_T_NONE) {
+		printf("DWMMC: base address is invalid\n");
+		return -EINVAL;
+	}
+
+	host->priv = priv;
+
+	return 0;
+}
+
+struct dm_mmc_ops ca_dwmci_dm_ops;
+
+static int ca_dwmmc_probe(struct udevice *dev)
+{
+	struct ca_mmc_plat *plat = dev_get_platdata(dev);
+	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+	struct ca_dwmmc_priv_data *priv = dev_get_priv(dev);
+	struct dwmci_host *host = &priv->host;
+
+	memcpy(&ca_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
+
+	dwmci_setup_cfg(&plat->cfg, host, host->bus_hz, MIN_FREQ);
+	if (host->buswidth == 1) {
+		(&plat->cfg)->host_caps &= ~MMC_MODE_8BIT;
+		(&plat->cfg)->host_caps &= ~MMC_MODE_4BIT;
+	}
+
+	host->mmc = &plat->mmc;
+	host->mmc->priv = &priv->host;
+	upriv->mmc = host->mmc;
+	host->mmc->dev = dev;
+	host->clksel = ca_dwmci_clksel;
+	host->board_init = ca_dwmci_board_init;
+	host->get_mmc_clk = ca_dwmci_get_mmc_clock;
+
+	return dwmci_probe(dev);
+}
+
+static int ca_dwmmc_bind(struct udevice *dev)
+{
+	struct ca_mmc_plat *plat = dev_get_platdata(dev);
+
+	return dwmci_bind(dev, &plat->mmc, &plat->cfg);
+}
+
+static const struct udevice_id ca_dwmmc_ids[] = {
+	{ .compatible = "snps,dw-cortina" },
+	{ }
+};
+
+U_BOOT_DRIVER(ca_dwmmc_drv) = {
+	.name		= "cortina_dwmmc",
+	.id		= UCLASS_MMC,
+	.of_match	= ca_dwmmc_ids,
+	.ofdata_to_platdata = ca_dwmmc_ofdata_to_platdata,
+	.bind		= ca_dwmmc_bind,
+	.ops		= &ca_dwmci_dm_ops,
+	.probe		= ca_dwmmc_probe,
+	.priv_auto_alloc_size	= sizeof(struct ca_dwmmc_priv_data),
+	.platdata_auto_alloc_size = sizeof(struct ca_mmc_plat),
+};