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/kexec.h> 22#include <linux/of_platform.h> 23#include <linux/memblock.h> 24#include <mm/mmu_decl.h> 25 26#include <asm/io.h> 27#include <asm/machdep.h> 28#include <asm/prom.h> 29#include <asm/time.h> 30#include <asm/udbg.h> 31 32#include "flipper-pic.h" 33#include "hlwd-pic.h" 34#include "usbgecko_udbg.h" 35 36/* control block */ 37#define HW_CTRL_COMPATIBLE "nintendo,hollywood-control" 38 39#define HW_CTRL_RESETS 0x94 40#define HW_CTRL_RESETS_SYS (1<<0) 41 42/* gpio */ 43#define HW_GPIO_COMPATIBLE "nintendo,hollywood-gpio" 44 45#define HW_GPIO_BASE(idx) (idx * 0x20) 46#define HW_GPIO_OUT(idx) (HW_GPIO_BASE(idx) + 0) 47#define HW_GPIO_DIR(idx) (HW_GPIO_BASE(idx) + 4) 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 54static void __iomem *hw_ctrl; 55static void __iomem *hw_gpio; 56 57unsigned long wii_hole_start; 58unsigned long wii_hole_size; 59 60 61static int __init page_aligned(unsigned long x) 62{ 63 return !(x & (PAGE_SIZE-1)); 64} 65 66void __init wii_memory_fixups(void) 67{ 68 struct memblock_property *p = memblock.memory.region; 69 70 71 BUG_ON(memblock.memory.cnt != 2); 72 BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base)); 73 74 p[0].size = _ALIGN_DOWN(p[0].size, PAGE_SIZE); 75 p[1].size = _ALIGN_DOWN(p[1].size, PAGE_SIZE); 76 77 wii_hole_start = p[0].base + p[0].size; 78 wii_hole_size = p[1].base - wii_hole_start; 79 80 pr_info("MEM1: <%08llx %08llx>\n", p[0].base, p[0].size); 81 pr_info("HOLE: <%08lx %08lx>\n", wii_hole_start, wii_hole_size); 82 pr_info("MEM2: <%08llx %08llx>\n", p[1].base, p[1].size); 83 84 p[0].size += wii_hole_size + p[1].size; 85 86 memblock.memory.cnt = 1; 87 memblock_analyze(); 88 89 /* reserve the hole */ 90 memblock_reserve(wii_hole_start, wii_hole_size); 91 92 /* allow ioremapping the address space in the hole */ 93 __allow_ioremap_reserved = 1; 94} 95 96unsigned long __init wii_mmu_mapin_mem2(unsigned long top) 97{ 98 unsigned long delta, size, bl; 99 unsigned long max_size = (256<<20); 100 101 /* MEM2 64MB@0x10000000 */ 102 delta = wii_hole_start + wii_hole_size; 103 size = top - delta; 104 for (bl = 128<<10; bl < max_size; bl <<= 1) { 105 if (bl * 2 > size) 106 break; 107 } 108 setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X); 109 return delta + bl; 110} 111 112static void wii_spin(void) 113{ 114 local_irq_disable(); 115 for (;;) 116 cpu_relax(); 117} 118 119static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible) 120{ 121 void __iomem *hw_regs = NULL; 122 struct device_node *np; 123 struct resource res; 124 int error = -ENODEV; 125 126 np = of_find_compatible_node(NULL, NULL, compatible); 127 if (!np) { 128 pr_err("no compatible node found for %s\n", compatible); 129 goto out; 130 } 131 error = of_address_to_resource(np, 0, &res); 132 if (error) { 133 pr_err("no valid reg found for %s\n", np->name); 134 goto out_put; 135 } 136 137 hw_regs = ioremap(res.start, resource_size(&res)); 138 if (hw_regs) { 139 pr_info("%s at 0x%08x mapped to 0x%p\n", name, 140 res.start, hw_regs); 141 } 142 143out_put: 144 of_node_put(np); 145out: 146 return hw_regs; 147} 148 149static void __init wii_setup_arch(void) 150{ 151 hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE); 152 hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE); 153 if (hw_gpio) { 154 /* turn off the front blue led and IR light */ 155 clrbits32(hw_gpio + HW_GPIO_OUT(0), 156 HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR); 157 } 158} 159 160static void wii_restart(char *cmd) 161{ 162 local_irq_disable(); 163 164 if (hw_ctrl) { 165 /* clear the system reset pin to cause a reset */ 166 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS); 167 } 168 wii_spin(); 169} 170 171static void wii_power_off(void) 172{ 173 local_irq_disable(); 174 175 if (hw_gpio) { 176 /* make sure that the poweroff GPIO is configured as output */ 177 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN); 178 179 /* drive the poweroff GPIO high */ 180 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN); 181 } 182 wii_spin(); 183} 184 185static void wii_halt(void) 186{ 187 if (ppc_md.restart) 188 ppc_md.restart(NULL); 189 wii_spin(); 190} 191 192static void __init wii_init_early(void) 193{ 194 ug_udbg_init(); 195} 196 197static void __init wii_pic_probe(void) 198{ 199 flipper_pic_probe(); 200 hlwd_pic_probe(); 201} 202 203static int __init wii_probe(void) 204{ 205 unsigned long dt_root; 206 207 dt_root = of_get_flat_dt_root(); 208 if (!of_flat_dt_is_compatible(dt_root, "nintendo,wii")) 209 return 0; 210 211 return 1; 212} 213 214static void wii_shutdown(void) 215{ 216 hlwd_quiesce(); 217 flipper_quiesce(); 218} 219 220#ifdef CONFIG_KEXEC 221static int wii_machine_kexec_prepare(struct kimage *image) 222{ 223 return 0; 224} 225#endif /* CONFIG_KEXEC */ 226 227define_machine(wii) { 228 .name = "wii", 229 .probe = wii_probe, 230 .init_early = wii_init_early, 231 .setup_arch = wii_setup_arch, 232 .restart = wii_restart, 233 .power_off = wii_power_off, 234 .halt = wii_halt, 235 .init_IRQ = wii_pic_probe, 236 .get_irq = flipper_pic_get_irq, 237 .calibrate_decr = generic_calibrate_decr, 238 .progress = udbg_progress, 239 .machine_shutdown = wii_shutdown, 240#ifdef CONFIG_KEXEC 241 .machine_kexec_prepare = wii_machine_kexec_prepare, 242#endif 243}; 244 245static struct of_device_id wii_of_bus[] = { 246 { .compatible = "nintendo,hollywood", }, 247 { }, 248}; 249 250static int __init wii_device_probe(void) 251{ 252 if (!machine_is(wii)) 253 return 0; 254 255 of_platform_bus_probe(NULL, wii_of_bus, NULL); 256 return 0; 257} 258device_initcall(wii_device_probe); 259