ARM: uniphier: deassert RST_n of eMMC device for LD11/LD20
For LD11 and LD20 SoCs, the RST_n pin is asserted by default. If
the EXT_CSD[162], bit[1:0] (RST_n_ENABLE) is fused, the eMMC device
would stay in the reset state until its RST_n pin is deasserted by
software.
Currently, this is cared by an ad-hoc way because the eMMC hardware
reset provider is not supported in U-Boot for now. This code should
be re-written once the "mmc-pwrseq-emmc" binding is supported.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/clk/clk-ld20.c b/arch/arm/mach-uniphier/clk/clk-ld20.c
new file mode 100644
index 0000000..5bb560c
--- /dev/null
+++ b/arch/arm/mach-uniphier/clk/clk-ld20.c
@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2017 Socionext Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <linux/io.h>
+
+#include "../init.h"
+
+#define SDCTRL_EMMC_HW_RESET 0x59810280
+
+void uniphier_ld20_clk_init(void)
+{
+ /* TODO: use "mmc-pwrseq-emmc" */
+ writel(1, SDCTRL_EMMC_HW_RESET);
+}