/* * 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"); keystone_pm_runtime_init(); of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); } static const char *keystone_match[] __initconst = { "ti,keystone", NULL, }; void keystone_restart(enum reboot_mode 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") #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE) .dma_zone_size = SZ_2G, #endif .smp = smp_ops(keystone_smp_ops), .init_machine = keystone_init, .dt_compat = keystone_match, .restart = keystone_restart, MACHINE_END