1 /* 2 * Keystone2 based boards and SOC related code. 3 * 4 * Copyright 2013 Texas Instruments, Inc. 5 * Cyril Chemparathy <cyril@ti.com> 6 * Santosh Shilimkar <santosh.shillimkar@ti.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms and conditions of the GNU General Public License, 10 * version 2, as published by the Free Software Foundation. 11 */ 12 #include <linux/io.h> 13 #include <linux/of.h> 14 #include <linux/init.h> 15 #include <linux/of_platform.h> 16 #include <linux/of_address.h> 17 18 #include <asm/setup.h> 19 #include <asm/mach/map.h> 20 #include <asm/mach/arch.h> 21 #include <asm/mach/time.h> 22 #include <asm/smp_plat.h> 23 24 #include "keystone.h" 25 26 #define PLL_RESET_WRITE_KEY_MASK 0xffff0000 27 #define PLL_RESET_WRITE_KEY 0x5a69 28 #define PLL_RESET BIT(16) 29 30 static void __iomem *keystone_rstctrl; 31 32 static void __init keystone_init(void) 33 { 34 struct device_node *node; 35 36 node = of_find_compatible_node(NULL, NULL, "ti,keystone-reset"); 37 if (WARN_ON(!node)) 38 pr_warn("ti,keystone-reset node undefined\n"); 39 40 keystone_rstctrl = of_iomap(node, 0); 41 if (WARN_ON(!keystone_rstctrl)) 42 pr_warn("ti,keystone-reset iomap error\n"); 43 44 keystone_pm_runtime_init(); 45 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 46 } 47 48 static const char *keystone_match[] __initconst = { 49 "ti,keystone", 50 NULL, 51 }; 52 53 void keystone_restart(enum reboot_mode mode, const char *cmd) 54 { 55 u32 val; 56 57 BUG_ON(!keystone_rstctrl); 58 59 /* Enable write access to RSTCTRL */ 60 val = readl(keystone_rstctrl); 61 val &= PLL_RESET_WRITE_KEY_MASK; 62 val |= PLL_RESET_WRITE_KEY; 63 writel(val, keystone_rstctrl); 64 65 /* Reset the SOC */ 66 val = readl(keystone_rstctrl); 67 val &= ~PLL_RESET; 68 writel(val, keystone_rstctrl); 69 } 70 71 DT_MACHINE_START(KEYSTONE, "Keystone") 72 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE) 73 .dma_zone_size = SZ_2G, 74 #endif 75 .smp = smp_ops(keystone_smp_ops), 76 .init_machine = keystone_init, 77 .dt_compat = keystone_match, 78 .restart = keystone_restart, 79 MACHINE_END 80