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 /* 71 * This is part of a workaround to allow the use of two 72 * discontinuous RAM ranges on the Wii, even if this is 73 * currently unsupported on 32-bit PowerPC Linux. 74 * 75 * We coalesce the two memory ranges of the Wii into a 76 * single range, then create a reservation for the "hole" 77 * between both ranges. 78 */ 79 80 BUG_ON(memblock.memory.cnt != 2); 81 BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base)); 82 83 /* determine hole */ 84 wii_hole_start = ALIGN(p[0].base + p[0].size, PAGE_SIZE); 85 wii_hole_size = p[1].base - wii_hole_start; 86 } 87 88 unsigned long __init wii_mmu_mapin_mem2(unsigned long top) 89 { 90 unsigned long delta, size, bl; 91 unsigned long max_size = (256<<20); 92 93 /* MEM2 64MB@0x10000000 */ 94 delta = wii_hole_start + wii_hole_size; 95 size = top - delta; 96 for (bl = 128<<10; bl < max_size; bl <<= 1) { 97 if (bl * 2 > size) 98 break; 99 } 100 setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X); 101 return delta + bl; 102 } 103 104 static void __noreturn wii_spin(void) 105 { 106 local_irq_disable(); 107 for (;;) 108 cpu_relax(); 109 } 110 111 static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible) 112 { 113 void __iomem *hw_regs = NULL; 114 struct device_node *np; 115 struct resource res; 116 int error = -ENODEV; 117 118 np = of_find_compatible_node(NULL, NULL, compatible); 119 if (!np) { 120 pr_err("no compatible node found for %s\n", compatible); 121 goto out; 122 } 123 error = of_address_to_resource(np, 0, &res); 124 if (error) { 125 pr_err("no valid reg found for %s\n", np->name); 126 goto out_put; 127 } 128 129 hw_regs = ioremap(res.start, resource_size(&res)); 130 if (hw_regs) { 131 pr_info("%s at 0x%08x mapped to 0x%p\n", name, 132 res.start, hw_regs); 133 } 134 135 out_put: 136 of_node_put(np); 137 out: 138 return hw_regs; 139 } 140 141 static void __init wii_setup_arch(void) 142 { 143 hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE); 144 hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE); 145 if (hw_gpio) { 146 /* turn off the front blue led and IR light */ 147 clrbits32(hw_gpio + HW_GPIO_OUT(0), 148 HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR); 149 } 150 } 151 152 static void __noreturn wii_restart(char *cmd) 153 { 154 local_irq_disable(); 155 156 if (hw_ctrl) { 157 /* clear the system reset pin to cause a reset */ 158 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS); 159 } 160 wii_spin(); 161 } 162 163 static void wii_power_off(void) 164 { 165 local_irq_disable(); 166 167 if (hw_gpio) { 168 /* 169 * set the owner of the shutdown pin to ARM, because it is 170 * accessed through the registers for the ARM, below 171 */ 172 clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN); 173 174 /* make sure that the poweroff GPIO is configured as output */ 175 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN); 176 177 /* drive the poweroff GPIO high */ 178 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN); 179 } 180 wii_spin(); 181 } 182 183 static void __noreturn wii_halt(void) 184 { 185 if (ppc_md.restart) 186 ppc_md.restart(NULL); 187 wii_spin(); 188 } 189 190 static void __init wii_pic_probe(void) 191 { 192 flipper_pic_probe(); 193 hlwd_pic_probe(); 194 } 195 196 static int __init wii_probe(void) 197 { 198 if (!of_machine_is_compatible("nintendo,wii")) 199 return 0; 200 201 pm_power_off = wii_power_off; 202 203 ug_udbg_init(); 204 205 return 1; 206 } 207 208 static void wii_shutdown(void) 209 { 210 hlwd_quiesce(); 211 flipper_quiesce(); 212 } 213 214 define_machine(wii) { 215 .name = "wii", 216 .probe = wii_probe, 217 .setup_arch = wii_setup_arch, 218 .restart = wii_restart, 219 .halt = wii_halt, 220 .init_IRQ = wii_pic_probe, 221 .get_irq = flipper_pic_get_irq, 222 .calibrate_decr = generic_calibrate_decr, 223 .progress = udbg_progress, 224 .machine_shutdown = wii_shutdown, 225 }; 226 227 static const struct of_device_id wii_of_bus[] = { 228 { .compatible = "nintendo,hollywood", }, 229 { }, 230 }; 231 232 static int __init wii_device_probe(void) 233 { 234 if (!machine_is(wii)) 235 return 0; 236 237 of_platform_populate(NULL, wii_of_bus, NULL, NULL); 238 return 0; 239 } 240 device_initcall(wii_device_probe); 241 242