[PATCH 33/42] mmc: exynos_dw_mmc: Add support for ARM64 Exynos chips

[Sam Protsenko]

Add the compatible entry and corresponding chip data for Exynos7
compatible chips, which covers modern ARM64 based Exynos chips. They
have some differences w.r.t. old ARM32 Exynos chips:
  - CLKSEL register offset is different
  - 64-bit IDMAC descriptor and 64-bit IDMAC registers are used
    (implemented in dw_mmc core driver)

In terms of the driver implementation, the CIU clock is obtained via CCF
framework (as opposed to ad-hoc clock driver implementation for ARM32
chips).

Signed-off-by: Sam Protsenko <semen.protsenko at linaro.org>
---
 arch/arm/mach-exynos/include/mach/dwmmc.h | 1 +
 drivers/mmc/exynos_dw_mmc.c               | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/arch/arm/mach-exynos/include/mach/dwmmc.h b/arch/arm/mach-exynos/include/mach/dwmmc.h
index 811e9a04c6e3..7cb71be0d9fd 100644
--- a/arch/arm/mach-exynos/include/mach/dwmmc.h
+++ b/arch/arm/mach-exynos/include/mach/dwmmc.h
@@ -8,6 +8,7 @@
 #define __ASM_ARM_ARCH_DWMMC_H
 
 #define DWMCI_CLKSEL		0x09C
+#define DWMCI_CLKSEL64		0x0a8
 #define DWMCI_SET_SAMPLE_CLK(x)	(x)
 #define DWMCI_SET_DRV_CLK(x)	((x) << 16)
 #define DWMCI_SET_DIV_RATIO(x)	((x) << 24)
diff --git a/drivers/mmc/exynos_dw_mmc.c b/drivers/mmc/exynos_dw_mmc.c
index 938fd51a2ac6..ac1a1784b440 100644
--- a/drivers/mmc/exynos_dw_mmc.c
+++ b/drivers/mmc/exynos_dw_mmc.c
@@ -386,6 +386,11 @@ static const struct exynos_dwmmc_variant exynos5_drv_data = {
 #endif
 };
 
+static const struct exynos_dwmmc_variant exynos7_smu_drv_data = {
+	.clksel	= DWMCI_CLKSEL64,
+	.quirks	= DWMCI_QUIRK_DISABLE_SMU,
+};
+
 static const struct udevice_id exynos_dwmmc_ids[] = {
 	{
 		.compatible	= "samsung,exynos4412-dw-mshc",
@@ -393,6 +398,9 @@ static const struct udevice_id exynos_dwmmc_ids[] = {
 	}, {
 		.compatible	= "samsung,exynos-dwmmc",
 		.data		= (ulong)&exynos5_drv_data,
+	}, {
+		.compatible	= "samsung,exynos7-dw-mshc-smu",
+		.data		= (ulong)&exynos7_smu_drv_data,
 	},
 	{ }
 };
-- 
2.39.2