GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/arm/mach-uniphier/clk/clk-dram-ld4.c

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2011-2014 Panasonic Corporation
+ * Copyright (C) 2015-2017 Socionext Inc.
+ */
+
+#include <common.h>
+#include <spl.h>
+#include <linux/io.h>
+
+#include "../init.h"
+#include "../sc-regs.h"
+
+void uniphier_ld4_dram_clk_init(void)
+{
+	u32 tmp;
+
+	/* deassert reset */
+	tmp = readl(sc_base + SC_RSTCTRL);
+	tmp |= SC_RSTCTRL_NRST_UMC1 | SC_RSTCTRL_NRST_UMC0;
+	writel(tmp, sc_base + SC_RSTCTRL);
+	readl(sc_base + SC_RSTCTRL); /* dummy read */
+
+	/* provide clocks */
+	tmp = readl(sc_base + SC_CLKCTRL);
+	tmp |= SC_CLKCTRL_CEN_UMC;
+	writel(tmp, sc_base + SC_CLKCTRL);
+	readl(sc_base + SC_CLKCTRL); /* dummy read */
+}