13b52634fSMaxime Ripard /* 23b52634fSMaxime Ripard * Device Tree support for Allwinner A1X SoCs 33b52634fSMaxime Ripard * 43b52634fSMaxime Ripard * Copyright (C) 2012 Maxime Ripard 53b52634fSMaxime Ripard * 63b52634fSMaxime Ripard * Maxime Ripard <maxime.ripard@free-electrons.com> 73b52634fSMaxime Ripard * 83b52634fSMaxime Ripard * This file is licensed under the terms of the GNU General Public 93b52634fSMaxime Ripard * License version 2. This program is licensed "as is" without any 103b52634fSMaxime Ripard * warranty of any kind, whether express or implied. 113b52634fSMaxime Ripard */ 123b52634fSMaxime Ripard 133b52634fSMaxime Ripard #include <linux/kernel.h> 143b52634fSMaxime Ripard #include <linux/init.h> 1567bea88dSMaxime Ripard #include <linux/of_address.h> 163b52634fSMaxime Ripard #include <linux/of_irq.h> 173b52634fSMaxime Ripard #include <linux/of_platform.h> 183b52634fSMaxime Ripard #include <linux/io.h> 193b52634fSMaxime Ripard #include <linux/sunxi_timer.h> 203b52634fSMaxime Ripard 213b52634fSMaxime Ripard #include <linux/irqchip/sunxi.h> 223b52634fSMaxime Ripard 233b52634fSMaxime Ripard #include <asm/hardware/vic.h> 243b52634fSMaxime Ripard 253b52634fSMaxime Ripard #include <asm/mach/arch.h> 263b52634fSMaxime Ripard #include <asm/mach/map.h> 273b52634fSMaxime Ripard 283b52634fSMaxime Ripard #include "sunxi.h" 293b52634fSMaxime Ripard 3067bea88dSMaxime Ripard #define WATCHDOG_CTRL_REG 0x00 3167bea88dSMaxime Ripard #define WATCHDOG_MODE_REG 0x04 3267bea88dSMaxime Ripard 3367bea88dSMaxime Ripard static void __iomem *wdt_base; 3467bea88dSMaxime Ripard 3567bea88dSMaxime Ripard static void sunxi_setup_restart(void) 3667bea88dSMaxime Ripard { 3767bea88dSMaxime Ripard struct device_node *np = of_find_compatible_node(NULL, NULL, 3867bea88dSMaxime Ripard "allwinner,sunxi-wdt"); 3967bea88dSMaxime Ripard if (WARN(!np, "unable to setup watchdog restart")) 4067bea88dSMaxime Ripard return; 4167bea88dSMaxime Ripard 4267bea88dSMaxime Ripard wdt_base = of_iomap(np, 0); 4367bea88dSMaxime Ripard WARN(!wdt_base, "failed to map watchdog base address"); 4467bea88dSMaxime Ripard } 4567bea88dSMaxime Ripard 4667bea88dSMaxime Ripard static void sunxi_restart(char mode, const char *cmd) 4767bea88dSMaxime Ripard { 4867bea88dSMaxime Ripard if (!wdt_base) 4967bea88dSMaxime Ripard return; 5067bea88dSMaxime Ripard 5167bea88dSMaxime Ripard /* Enable timer and set reset bit in the watchdog */ 5267bea88dSMaxime Ripard writel(3, wdt_base + WATCHDOG_MODE_REG); 5367bea88dSMaxime Ripard writel(0xa57 << 1 | 1, wdt_base + WATCHDOG_CTRL_REG); 5467bea88dSMaxime Ripard while(1) { 5567bea88dSMaxime Ripard mdelay(5); 5667bea88dSMaxime Ripard writel(3, wdt_base + WATCHDOG_MODE_REG); 5767bea88dSMaxime Ripard } 5867bea88dSMaxime Ripard } 5967bea88dSMaxime Ripard 603b52634fSMaxime Ripard static struct map_desc sunxi_io_desc[] __initdata = { 613b52634fSMaxime Ripard { 623b52634fSMaxime Ripard .virtual = (unsigned long) SUNXI_REGS_VIRT_BASE, 633b52634fSMaxime Ripard .pfn = __phys_to_pfn(SUNXI_REGS_PHYS_BASE), 643b52634fSMaxime Ripard .length = SUNXI_REGS_SIZE, 653b52634fSMaxime Ripard .type = MT_DEVICE, 663b52634fSMaxime Ripard }, 673b52634fSMaxime Ripard }; 683b52634fSMaxime Ripard 693b52634fSMaxime Ripard void __init sunxi_map_io(void) 703b52634fSMaxime Ripard { 713b52634fSMaxime Ripard iotable_init(sunxi_io_desc, ARRAY_SIZE(sunxi_io_desc)); 723b52634fSMaxime Ripard } 733b52634fSMaxime Ripard 743b52634fSMaxime Ripard static void __init sunxi_dt_init(void) 753b52634fSMaxime Ripard { 7667bea88dSMaxime Ripard sunxi_setup_restart(); 7767bea88dSMaxime Ripard 783b52634fSMaxime Ripard of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 793b52634fSMaxime Ripard } 803b52634fSMaxime Ripard 813b52634fSMaxime Ripard static const char * const sunxi_board_dt_compat[] = { 82f055f1f6SStefan Roese "allwinner,sun4i", 833b52634fSMaxime Ripard "allwinner,sun5i", 843b52634fSMaxime Ripard NULL, 853b52634fSMaxime Ripard }; 863b52634fSMaxime Ripard 873b52634fSMaxime Ripard DT_MACHINE_START(SUNXI_DT, "Allwinner A1X (Device Tree)") 883b52634fSMaxime Ripard .init_machine = sunxi_dt_init, 893b52634fSMaxime Ripard .map_io = sunxi_map_io, 903b52634fSMaxime Ripard .init_irq = sunxi_init_irq, 913b52634fSMaxime Ripard .handle_irq = sunxi_handle_irq, 9267bea88dSMaxime Ripard .restart = sunxi_restart, 933b52634fSMaxime Ripard .timer = &sunxi_timer, 943b52634fSMaxime Ripard .dt_compat = sunxi_board_dt_compat, 953b52634fSMaxime Ripard MACHINE_END 96