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 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_property *p = memblock.memory.region; 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 p[0].size = _ALIGN_DOWN(p[0].size, PAGE_SIZE); 84 p[1].size = _ALIGN_DOWN(p[1].size, PAGE_SIZE); 85 86 wii_hole_start = p[0].base + p[0].size; 87 wii_hole_size = p[1].base - wii_hole_start; 88 89 pr_info("MEM1: <%08llx %08llx>\n", p[0].base, p[0].size); 90 pr_info("HOLE: <%08lx %08lx>\n", wii_hole_start, wii_hole_size); 91 pr_info("MEM2: <%08llx %08llx>\n", p[1].base, p[1].size); 92 93 p[0].size += wii_hole_size + p[1].size; 94 95 memblock.memory.cnt = 1; 96 memblock_analyze(); 97 98 /* reserve the hole */ 99 memblock_reserve(wii_hole_start, wii_hole_size); 100 101 /* allow ioremapping the address space in the hole */ 102 __allow_ioremap_reserved = 1; 103 } 104 105 unsigned long __init wii_mmu_mapin_mem2(unsigned long top) 106 { 107 unsigned long delta, size, bl; 108 unsigned long max_size = (256<<20); 109 110 /* MEM2 64MB@0x10000000 */ 111 delta = wii_hole_start + wii_hole_size; 112 size = top - delta; 113 for (bl = 128<<10; bl < max_size; bl <<= 1) { 114 if (bl * 2 > size) 115 break; 116 } 117 setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X); 118 return delta + bl; 119 } 120 121 static void wii_spin(void) 122 { 123 local_irq_disable(); 124 for (;;) 125 cpu_relax(); 126 } 127 128 static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible) 129 { 130 void __iomem *hw_regs = NULL; 131 struct device_node *np; 132 struct resource res; 133 int error = -ENODEV; 134 135 np = of_find_compatible_node(NULL, NULL, compatible); 136 if (!np) { 137 pr_err("no compatible node found for %s\n", compatible); 138 goto out; 139 } 140 error = of_address_to_resource(np, 0, &res); 141 if (error) { 142 pr_err("no valid reg found for %s\n", np->name); 143 goto out_put; 144 } 145 146 hw_regs = ioremap(res.start, resource_size(&res)); 147 if (hw_regs) { 148 pr_info("%s at 0x%08x mapped to 0x%p\n", name, 149 res.start, hw_regs); 150 } 151 152 out_put: 153 of_node_put(np); 154 out: 155 return hw_regs; 156 } 157 158 static void __init wii_setup_arch(void) 159 { 160 hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE); 161 hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE); 162 if (hw_gpio) { 163 /* turn off the front blue led and IR light */ 164 clrbits32(hw_gpio + HW_GPIO_OUT(0), 165 HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR); 166 } 167 } 168 169 static void wii_restart(char *cmd) 170 { 171 local_irq_disable(); 172 173 if (hw_ctrl) { 174 /* clear the system reset pin to cause a reset */ 175 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS); 176 } 177 wii_spin(); 178 } 179 180 static void wii_power_off(void) 181 { 182 local_irq_disable(); 183 184 if (hw_gpio) { 185 /* make sure that the poweroff GPIO is configured as output */ 186 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN); 187 188 /* drive the poweroff GPIO high */ 189 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN); 190 } 191 wii_spin(); 192 } 193 194 static void wii_halt(void) 195 { 196 if (ppc_md.restart) 197 ppc_md.restart(NULL); 198 wii_spin(); 199 } 200 201 static void __init wii_init_early(void) 202 { 203 ug_udbg_init(); 204 } 205 206 static void __init wii_pic_probe(void) 207 { 208 flipper_pic_probe(); 209 hlwd_pic_probe(); 210 } 211 212 static int __init wii_probe(void) 213 { 214 unsigned long dt_root; 215 216 dt_root = of_get_flat_dt_root(); 217 if (!of_flat_dt_is_compatible(dt_root, "nintendo,wii")) 218 return 0; 219 220 return 1; 221 } 222 223 static void wii_shutdown(void) 224 { 225 hlwd_quiesce(); 226 flipper_quiesce(); 227 } 228 229 #ifdef CONFIG_KEXEC 230 static int wii_machine_kexec_prepare(struct kimage *image) 231 { 232 return 0; 233 } 234 #endif /* CONFIG_KEXEC */ 235 236 define_machine(wii) { 237 .name = "wii", 238 .probe = wii_probe, 239 .init_early = wii_init_early, 240 .setup_arch = wii_setup_arch, 241 .restart = wii_restart, 242 .power_off = wii_power_off, 243 .halt = wii_halt, 244 .init_IRQ = wii_pic_probe, 245 .get_irq = flipper_pic_get_irq, 246 .calibrate_decr = generic_calibrate_decr, 247 .progress = udbg_progress, 248 .machine_shutdown = wii_shutdown, 249 #ifdef CONFIG_KEXEC 250 .machine_kexec_prepare = wii_machine_kexec_prepare, 251 #endif 252 }; 253 254 static struct of_device_id wii_of_bus[] = { 255 { .compatible = "nintendo,hollywood", }, 256 { }, 257 }; 258 259 static int __init wii_device_probe(void) 260 { 261 if (!machine_is(wii)) 262 return 0; 263 264 of_platform_bus_probe(NULL, wii_of_bus, NULL); 265 return 0; 266 } 267 device_initcall(wii_device_probe); 268 269