1 /* 2 * arch/arm/mach-vt8500/vt8500.c 3 * 4 * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 21 #include <linux/io.h> 22 #include <linux/pm.h> 23 24 #include <asm/mach-types.h> 25 #include <asm/mach/arch.h> 26 #include <asm/mach/time.h> 27 #include <asm/mach/map.h> 28 29 #include <linux/of.h> 30 #include <linux/of_address.h> 31 #include <linux/of_irq.h> 32 #include <linux/of_platform.h> 33 34 #include <mach/restart.h> 35 36 #include "common.h" 37 38 #define LEGACY_GPIO_BASE 0xD8110000 39 #define LEGACY_PMC_BASE 0xD8130000 40 41 /* Registers in GPIO Controller */ 42 #define VT8500_GPIO_MUX_REG 0x200 43 44 /* Registers in Power Management Controller */ 45 #define VT8500_HCR_REG 0x12 46 #define VT8500_PMSR_REG 0x60 47 48 static void __iomem *pmc_base; 49 50 void vt8500_restart(char mode, const char *cmd) 51 { 52 if (pmc_base) 53 writel(1, pmc_base + VT8500_PMSR_REG); 54 } 55 56 static struct map_desc vt8500_io_desc[] __initdata = { 57 /* SoC MMIO registers */ 58 [0] = { 59 .virtual = 0xf8000000, 60 .pfn = __phys_to_pfn(0xd8000000), 61 .length = 0x00390000, /* max of all chip variants */ 62 .type = MT_DEVICE 63 }, 64 }; 65 66 void __init vt8500_map_io(void) 67 { 68 iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc)); 69 } 70 71 static void vt8500_power_off(void) 72 { 73 local_irq_disable(); 74 writew(5, pmc_base + VT8500_HCR_REG); 75 asm("mcr%? p15, 0, %0, c7, c0, 4" : : "r" (0)); 76 } 77 78 void __init vt8500_init(void) 79 { 80 struct device_node *np; 81 #if defined(CONFIG_FB_VT8500) || defined(CONFIG_FB_WM8505) 82 struct device_node *fb; 83 void __iomem *gpio_base; 84 #endif 85 86 #ifdef CONFIG_FB_VT8500 87 fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb"); 88 if (fb) { 89 np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio"); 90 if (np) { 91 gpio_base = of_iomap(np, 0); 92 93 if (!gpio_base) 94 pr_err("%s: of_iomap(gpio_mux) failed\n", 95 __func__); 96 97 of_node_put(np); 98 } else { 99 gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000); 100 if (!gpio_base) 101 pr_err("%s: ioremap(legacy_gpio_mux) failed\n", 102 __func__); 103 } 104 if (gpio_base) { 105 writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 1, 106 gpio_base + VT8500_GPIO_MUX_REG); 107 iounmap(gpio_base); 108 } else 109 pr_err("%s: Could not remap GPIO mux\n", __func__); 110 111 of_node_put(fb); 112 } 113 #endif 114 115 #ifdef CONFIG_FB_WM8505 116 fb = of_find_compatible_node(NULL, NULL, "wm,wm8505-fb"); 117 if (fb) { 118 np = of_find_compatible_node(NULL, NULL, "wm,wm8505-gpio"); 119 if (!np) 120 np = of_find_compatible_node(NULL, NULL, 121 "wm,wm8650-gpio"); 122 if (np) { 123 gpio_base = of_iomap(np, 0); 124 125 if (!gpio_base) 126 pr_err("%s: of_iomap(gpio_mux) failed\n", 127 __func__); 128 129 of_node_put(np); 130 } else { 131 gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000); 132 if (!gpio_base) 133 pr_err("%s: ioremap(legacy_gpio_mux) failed\n", 134 __func__); 135 } 136 if (gpio_base) { 137 writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 138 0x80000000, gpio_base + VT8500_GPIO_MUX_REG); 139 iounmap(gpio_base); 140 } else 141 pr_err("%s: Could not remap GPIO mux\n", __func__); 142 143 of_node_put(fb); 144 } 145 #endif 146 147 np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc"); 148 if (np) { 149 pmc_base = of_iomap(np, 0); 150 151 if (!pmc_base) 152 pr_err("%s:of_iomap(pmc) failed\n", __func__); 153 154 of_node_put(np); 155 } else { 156 pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000); 157 if (!pmc_base) 158 pr_err("%s:ioremap(power_off) failed\n", __func__); 159 } 160 if (pmc_base) 161 pm_power_off = &vt8500_power_off; 162 else 163 pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n", __func__); 164 165 vtwm_clk_init(pmc_base); 166 167 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 168 } 169 170 static const struct of_device_id vt8500_irq_match[] __initconst = { 171 { .compatible = "via,vt8500-intc", .data = vt8500_irq_init, }, 172 { /* sentinel */ }, 173 }; 174 175 static void __init vt8500_init_irq(void) 176 { 177 of_irq_init(vt8500_irq_match); 178 }; 179 180 static struct sys_timer vt8500_timer = { 181 .init = vt8500_timer_init, 182 }; 183 184 static const char * const vt8500_dt_compat[] = { 185 "via,vt8500", 186 "wm,wm8650", 187 "wm,wm8505", 188 }; 189 190 DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)") 191 .dt_compat = vt8500_dt_compat, 192 .map_io = vt8500_map_io, 193 .init_irq = vt8500_init_irq, 194 .timer = &vt8500_timer, 195 .init_machine = vt8500_init, 196 .restart = vt8500_restart, 197 MACHINE_END 198 199