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Diffstat (limited to 'arch/arm/mach-keystone/keystone.c')
| -rw-r--r-- | arch/arm/mach-keystone/keystone.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c new file mode 100644 index 000000000000..a67c19b8be20 --- /dev/null +++ b/arch/arm/mach-keystone/keystone.c @@ -0,0 +1,71 @@ +/* + * 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> + +#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") + .init_machine = keystone_init, + .dt_compat = keystone_match, + .restart = keystone_restart, +MACHINE_END |
