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

source/bootloader/u-boot-2020.01/arch/arm/mach-uniphier/clk/clk-dram-pro5.c

@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015-2017 Socionext Inc.
+ */
+
+#include <linux/io.h>
+
+#include "../init.h"
+#include "../sc-regs.h"
+
+void uniphier_pro5_dram_clk_init(void)
+{
+	u32 tmp;
+
+	/*
+	 * deassert reset
+	 * UMCA2: Ch1 (DDR3)
+	 * UMCA1, UMC31: Ch0 (WIO1)
+	 * UMCA0, UMC30: Ch0 (WIO0)
+	 */
+	tmp = readl(sc_base + SC_RSTCTRL4);
+	tmp |= SC_RSTCTRL4_NRST_UMCSB | SC_RSTCTRL4_NRST_UMCA2 |
+	       SC_RSTCTRL4_NRST_UMCA1 | SC_RSTCTRL4_NRST_UMCA0 |
+	       SC_RSTCTRL4_NRST_UMC31 | SC_RSTCTRL4_NRST_UMC30;
+	writel(tmp, sc_base + SC_RSTCTRL4);
+	readl(sc_base + SC_RSTCTRL4); /* dummy read */
+
+	/* provide clocks */
+	tmp = readl(sc_base + SC_CLKCTRL4);
+	tmp |= SC_CLKCTRL4_CEN_UMCSB | SC_CLKCTRL4_CEN_UMC1 |
+	       SC_CLKCTRL4_CEN_UMC0;
+	writel(tmp, sc_base + SC_CLKCTRL4);
+	readl(sc_base + SC_CLKCTRL4); /* dummy read */
+}