1 /* 2 * arch/powerpc/platforms/embedded6xx/wii.c 3 * 4 * Nintendo Wii board-specific support 5 * Copyright (C) 2008-2009 The GameCube Linux Team 6 * Copyright (C) 2008,2009 Albert Herranz 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 2 11 * of the License, or (at your option) any later version. 12 * 13 */ 14 #define DRV_MODULE_NAME "wii" 15 #define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt 16 17 #include <linux/kernel.h> 18 #include <linux/init.h> 19 #include <linux/irq.h> 20 #include <linux/seq_file.h> 21 #include <linux/of_platform.h> 22 #include <linux/memblock.h> 23 #include <mm/mmu_decl.h> 24 25 #include <asm/io.h> 26 #include <asm/machdep.h> 27 #include <asm/prom.h> 28 #include <asm/time.h> 29 #include <asm/udbg.h> 30 31 #include "flipper-pic.h" 32 #include "hlwd-pic.h" 33 #include "usbgecko_udbg.h" 34 35 /* control block */ 36 #define HW_CTRL_COMPATIBLE "nintendo,hollywood-control" 37 38 #define HW_CTRL_RESETS 0x94 39 #define HW_CTRL_RESETS_SYS (1<<0) 40 41 /* gpio */ 42 #define HW_GPIO_COMPATIBLE "nintendo,hollywood-gpio" 43 44 #define HW_GPIO_BASE(idx) (idx * 0x20) 45 #define HW_GPIO_OUT(idx) (HW_GPIO_BASE(idx) + 0) 46 #define HW_GPIO_DIR(idx) (HW_GPIO_BASE(idx) + 4) 47 #define HW_GPIO_OWNER (HW_GPIO_BASE(1) + 0x1c) 48 49 #define HW_GPIO_SHUTDOWN (1<<1) 50 #define HW_GPIO_SLOT_LED (1<<5) 51 #define HW_GPIO_SENSOR_BAR (1<<8) 52 53 54 static void __iomem *hw_ctrl; 55 static void __iomem *hw_gpio; 56 57 static int __init page_aligned(unsigned long x) 58 { 59 return !(x & (PAGE_SIZE-1)); 60 } 61 62 void __init wii_memory_fixups(void) 63 { 64 struct memblock_region *p = memblock.memory.regions; 65 66 BUG_ON(memblock.memory.cnt != 2); 67 BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base)); 68 } 69 70 static void __noreturn wii_spin(void) 71 { 72 local_irq_disable(); 73 for (;;) 74 cpu_relax(); 75 } 76 77 static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible) 78 { 79 void __iomem *hw_regs = NULL; 80 struct device_node *np; 81 struct resource res; 82 int error = -ENODEV; 83 84 np = of_find_compatible_node(NULL, NULL, compatible); 85 if (!np) { 86 pr_err("no compatible node found for %s\n", compatible); 87 goto out; 88 } 89 error = of_address_to_resource(np, 0, &res); 90 if (error) { 91 pr_err("no valid reg found for %pOFn\n", np); 92 goto out_put; 93 } 94 95 hw_regs = ioremap(res.start, resource_size(&res)); 96 if (hw_regs) { 97 pr_info("%s at 0x%08x mapped to 0x%p\n", name, 98 res.start, hw_regs); 99 } 100 101 out_put: 102 of_node_put(np); 103 out: 104 return hw_regs; 105 } 106 107 static void __init wii_setup_arch(void) 108 { 109 hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE); 110 hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE); 111 if (hw_gpio) { 112 /* turn off the front blue led and IR light */ 113 clrbits32(hw_gpio + HW_GPIO_OUT(0), 114 HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR); 115 } 116 } 117 118 static void __noreturn wii_restart(char *cmd) 119 { 120 local_irq_disable(); 121 122 if (hw_ctrl) { 123 /* clear the system reset pin to cause a reset */ 124 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS); 125 } 126 wii_spin(); 127 } 128 129 static void wii_power_off(void) 130 { 131 local_irq_disable(); 132 133 if (hw_gpio) { 134 /* 135 * set the owner of the shutdown pin to ARM, because it is 136 * accessed through the registers for the ARM, below 137 */ 138 clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN); 139 140 /* make sure that the poweroff GPIO is configured as output */ 141 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN); 142 143 /* drive the poweroff GPIO high */ 144 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN); 145 } 146 wii_spin(); 147 } 148 149 static void __noreturn wii_halt(void) 150 { 151 if (ppc_md.restart) 152 ppc_md.restart(NULL); 153 wii_spin(); 154 } 155 156 static void __init wii_pic_probe(void) 157 { 158 flipper_pic_probe(); 159 hlwd_pic_probe(); 160 } 161 162 static int __init wii_probe(void) 163 { 164 if (!of_machine_is_compatible("nintendo,wii")) 165 return 0; 166 167 pm_power_off = wii_power_off; 168 169 ug_udbg_init(); 170 171 return 1; 172 } 173 174 static void wii_shutdown(void) 175 { 176 hlwd_quiesce(); 177 flipper_quiesce(); 178 } 179 180 define_machine(wii) { 181 .name = "wii", 182 .probe = wii_probe, 183 .setup_arch = wii_setup_arch, 184 .restart = wii_restart, 185 .halt = wii_halt, 186 .init_IRQ = wii_pic_probe, 187 .get_irq = flipper_pic_get_irq, 188 .calibrate_decr = generic_calibrate_decr, 189 .progress = udbg_progress, 190 .machine_shutdown = wii_shutdown, 191 }; 192 193 static const struct of_device_id wii_of_bus[] = { 194 { .compatible = "nintendo,hollywood", }, 195 { }, 196 }; 197 198 static int __init wii_device_probe(void) 199 { 200 if (!machine_is(wii)) 201 return 0; 202 203 of_platform_populate(NULL, wii_of_bus, NULL, NULL); 204 return 0; 205 } 206 device_initcall(wii_device_probe); 207 208