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-rw-r--r--arch/arm/mach-keystone/keystone.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c
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+++ b/arch/arm/mach-keystone/keystone.c
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+/*
+ * Keystone2 based boards and SOC related code.
+ *
+ * Copyright 2013 Texas Instruments, Inc.
+ * Cyril Chemparathy <cyril@ti.com>
+ * Santosh Shilimkar <santosh.shillimkar@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/init.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+
+#include <asm/setup.h>
+#include <asm/mach/map.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/time.h>
+#include <asm/smp_plat.h>
+
+#include "keystone.h"
+
+#define PLL_RESET_WRITE_KEY_MASK 0xffff0000
+#define PLL_RESET_WRITE_KEY 0x5a69
+#define PLL_RESET BIT(16)
+
+static void __iomem *keystone_rstctrl;
+
+static void __init keystone_init(void)
+{
+ struct device_node *node;
+
+ node = of_find_compatible_node(NULL, NULL, "ti,keystone-reset");
+ if (WARN_ON(!node))
+ pr_warn("ti,keystone-reset node undefined\n");
+
+ keystone_rstctrl = of_iomap(node, 0);
+ if (WARN_ON(!keystone_rstctrl))
+ pr_warn("ti,keystone-reset iomap error\n");
+
+ of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+}
+
+static const char *keystone_match[] __initconst = {
+ "ti,keystone-evm",
+ NULL,
+};
+
+void keystone_restart(char mode, const char *cmd)
+{
+ u32 val;
+
+ BUG_ON(!keystone_rstctrl);
+
+ /* Enable write access to RSTCTRL */
+ val = readl(keystone_rstctrl);
+ val &= PLL_RESET_WRITE_KEY_MASK;
+ val |= PLL_RESET_WRITE_KEY;
+ writel(val, keystone_rstctrl);
+
+ /* Reset the SOC */
+ val = readl(keystone_rstctrl);
+ val &= ~PLL_RESET;
+ writel(val, keystone_rstctrl);
+}
+
+DT_MACHINE_START(KEYSTONE, "Keystone")
+ .smp = smp_ops(keystone_smp_ops),
+ .init_machine = keystone_init,
+ .dt_compat = keystone_match,
+ .restart = keystone_restart,
+MACHINE_END