mmc: tangier: Add Intel Tangier eMMC/SDHCI driver

This patch adds Intel Tangier eMMC/SDHCI driver.

Intel Tangier SoC contains a hybrid of PCI and non-PCI devices. SDHCI
controller is one of the devices which are *not* on a PCI and, hence,
cannot be enumerated by standard PCI means. This driver, allows for
SDHCI controller on Tangier SoC to work in U-Boot.

Signed-off-by: Vincent Tinelli <vincent.tinelli@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

3 files changed, 96 insertions, 0 deletions

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 78091cc217..05e0b10f34 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -325,6 +325,20 @@ config MMC_SDHCI_XENON
 
 	  If unsure, say N.
 
+config MMC_SDHCI_TANGIER
+	bool "Tangier SDHCI controller support"
+	depends on DM_MMC && BLK
+	depends on MMC_SDHCI
+	help
+	  This selects support for SDHCI controller on Tanginer
+	  SoC. Note that this controller does not sit on PCI bus and,
+	  hence, cannot be enumerated by standard PCI means.
+
+	  If you're using an Intel Tangier SoC (available on Intel
+	  Edison board), say Y here.
+
+	  If unsure, say N.
+
 config MMC_SDHCI_TEGRA
 	bool "SDHCI platform support for the Tegra SD/MMC Controller"
 	depends on TEGRA
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 1e8d23f012..6a26a52c28 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_MMC_SDHCI_ROCKCHIP)	+= rockchip_sdhci.o
 obj-$(CONFIG_MMC_SDHCI_S5P)		+= s5p_sdhci.o
 obj-$(CONFIG_MMC_SDHCI_SPEAR)		+= spear_sdhci.o
 obj-$(CONFIG_MMC_SDHCI_STI) 		+= sti_sdhci.o
+obj-$(CONFIG_MMC_SDHCI_TANGIER)		+= tangier_sdhci.o
 obj-$(CONFIG_MMC_SDHCI_TEGRA)		+= tegra_mmc.o
 obj-$(CONFIG_MMC_SDHCI_XENON)		+= xenon_sdhci.o
 obj-$(CONFIG_MMC_SDHCI_ZYNQ)		+= zynq_sdhci.o
diff --git a/drivers/mmc/tangier_sdhci.c b/drivers/mmc/tangier_sdhci.c
new file mode 100644
index 0000000000..77b18e75f0
--- /dev/null
+++ b/drivers/mmc/tangier_sdhci.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <dm.h>
+#include <dm/device.h>
+#include <linux/io.h>
+#include <linux/sizes.h>
+#include <malloc.h>
+#include <mmc.h>
+#include <sdhci.h>
+
+#define SDHCI_TANGIER_FMAX	200000000
+#define SDHCI_TANGIER_FMIN	400000
+
+struct sdhci_tangier_plat {
+	struct mmc_config cfg;
+	struct mmc mmc;
+	void __iomem *ioaddr;
+};
+
+static int sdhci_tangier_bind(struct udevice *dev)
+{
+	struct sdhci_tangier_plat *plat = dev_get_platdata(dev);
+
+	return sdhci_bind(dev, &plat->mmc, &plat->cfg);
+}
+
+static int sdhci_tangier_probe(struct udevice *dev)
+{
+	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+	struct sdhci_tangier_plat *plat = dev_get_platdata(dev);
+	struct sdhci_host *host = dev_get_priv(dev);
+	fdt_addr_t base;
+	int ret;
+
+	base = dev_get_addr(dev);
+	if (base == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	plat->ioaddr = devm_ioremap(dev, base, SZ_1K);
+	if (!plat->ioaddr)
+		return -ENOMEM;
+
+	host->name = dev->name;
+	host->ioaddr = plat->ioaddr;
+	host->quirks = SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_VOLTAGE |
+		       SDHCI_QUIRK_32BIT_DMA_ADDR | SDHCI_QUIRK_WAIT_SEND_CMD;
+
+	/* MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195 */
+	host->voltages = MMC_VDD_165_195;
+
+	ret = sdhci_setup_cfg(&plat->cfg, host, SDHCI_TANGIER_FMAX,
+			SDHCI_TANGIER_FMIN);
+	if (ret)
+		return ret;
+
+	upriv->mmc = &plat->mmc;
+	host->mmc = &plat->mmc;
+	host->mmc->priv = host;
+
+	return sdhci_probe(dev);
+}
+
+static const struct udevice_id sdhci_tangier_match[] = {
+	{ .compatible = "intel,sdhci-tangier" },
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(sdhci_tangier) = {
+	.name		= "sdhci-tangier",
+	.id		= UCLASS_MMC,
+	.of_match	= sdhci_tangier_match,
+	.bind		= sdhci_tangier_bind,
+	.probe		= sdhci_tangier_probe,
+	.ops		= &sdhci_ops,
+	.priv_auto_alloc_size = sizeof(struct sdhci_host),
+	.platdata_auto_alloc_size = sizeof(struct sdhci_tangier_plat),
+};