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 unsigned long wii_hole_start; 58 unsigned long wii_hole_size; 59 60 61 static int __init page_aligned(unsigned long x) 62 { 63 return !(x & (PAGE_SIZE-1)); 64 } 65 66 void __init wii_memory_fixups(void) 67 { 68 struct memblock_region *p = memblock.memory.regions; 69 70 BUG_ON(memblock.memory.cnt != 2); 71 BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base)); 72 73 /* determine hole */ 74 wii_hole_start = ALIGN(p[0].base + p[0].size, PAGE_SIZE); 75 wii_hole_size = p[1].base - wii_hole_start; 76 } 77 78 unsigned long __init wii_mmu_mapin_mem2(unsigned long top) 79 { 80 unsigned long delta, size, bl; 81 unsigned long max_size = (256<<20); 82 83 /* MEM2 64MB@0x10000000 */ 84 delta = wii_hole_start + wii_hole_size; 85 size = top - delta; 86 for (bl = 128<<10; bl < max_size; bl <<= 1) { 87 if (bl * 2 > size) 88 break; 89 } 90 setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X); 91 return delta + bl; 92 } 93 94 static void __noreturn wii_spin(void) 95 { 96 local_irq_disable(); 97 for (;;) 98 cpu_relax(); 99 } 100 101 static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible) 102 { 103 void __iomem *hw_regs = NULL; 104 struct device_node *np; 105 struct resource res; 106 int error = -ENODEV; 107 108 np = of_find_compatible_node(NULL, NULL, compatible); 109 if (!np) { 110 pr_err("no compatible node found for %s\n", compatible); 111 goto out; 112 } 113 error = of_address_to_resource(np, 0, &res); 114 if (error) { 115 pr_err("no valid reg found for %s\n", np->name); 116 goto out_put; 117 } 118 119 hw_regs = ioremap(res.start, resource_size(&res)); 120 if (hw_regs) { 121 pr_info("%s at 0x%08x mapped to 0x%p\n", name, 122 res.start, hw_regs); 123 } 124 125 out_put: 126 of_node_put(np); 127 out: 128 return hw_regs; 129 } 130 131 static void __init wii_setup_arch(void) 132 { 133 hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE); 134 hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE); 135 if (hw_gpio) { 136 /* turn off the front blue led and IR light */ 137 clrbits32(hw_gpio + HW_GPIO_OUT(0), 138 HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR); 139 } 140 } 141 142 static void __noreturn wii_restart(char *cmd) 143 { 144 local_irq_disable(); 145 146 if (hw_ctrl) { 147 /* clear the system reset pin to cause a reset */ 148 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS); 149 } 150 wii_spin(); 151 } 152 153 static void wii_power_off(void) 154 { 155 local_irq_disable(); 156 157 if (hw_gpio) { 158 /* 159 * set the owner of the shutdown pin to ARM, because it is 160 * accessed through the registers for the ARM, below 161 */ 162 clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN); 163 164 /* make sure that the poweroff GPIO is configured as output */ 165 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN); 166 167 /* drive the poweroff GPIO high */ 168 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN); 169 } 170 wii_spin(); 171 } 172 173 static void __noreturn wii_halt(void) 174 { 175 if (ppc_md.restart) 176 ppc_md.restart(NULL); 177 wii_spin(); 178 } 179 180 static void __init wii_pic_probe(void) 181 { 182 flipper_pic_probe(); 183 hlwd_pic_probe(); 184 } 185 186 static int __init wii_probe(void) 187 { 188 if (!of_machine_is_compatible("nintendo,wii")) 189 return 0; 190 191 pm_power_off = wii_power_off; 192 193 ug_udbg_init(); 194 195 return 1; 196 } 197 198 static void wii_shutdown(void) 199 { 200 hlwd_quiesce(); 201 flipper_quiesce(); 202 } 203 204 define_machine(wii) { 205 .name = "wii", 206 .probe = wii_probe, 207 .setup_arch = wii_setup_arch, 208 .restart = wii_restart, 209 .halt = wii_halt, 210 .init_IRQ = wii_pic_probe, 211 .get_irq = flipper_pic_get_irq, 212 .calibrate_decr = generic_calibrate_decr, 213 .progress = udbg_progress, 214 .machine_shutdown = wii_shutdown, 215 }; 216 217 static const struct of_device_id wii_of_bus[] = { 218 { .compatible = "nintendo,hollywood", }, 219 { }, 220 }; 221 222 static int __init wii_device_probe(void) 223 { 224 if (!machine_is(wii)) 225 return 0; 226 227 of_platform_populate(NULL, wii_of_bus, NULL, NULL); 228 return 0; 229 } 230 device_initcall(wii_device_probe); 231 232