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 48 #define HW_GPIO_SHUTDOWN (1<<1) 49 #define HW_GPIO_SLOT_LED (1<<5) 50 #define HW_GPIO_SENSOR_BAR (1<<8) 51 52 53 static void __iomem *hw_ctrl; 54 static void __iomem *hw_gpio; 55 56 unsigned long wii_hole_start; 57 unsigned long wii_hole_size; 58 59 60 static int __init page_aligned(unsigned long x) 61 { 62 return !(x & (PAGE_SIZE-1)); 63 } 64 65 void __init wii_memory_fixups(void) 66 { 67 struct memblock_region *p = memblock.memory.regions; 68 69 /* 70 * This is part of a workaround to allow the use of two 71 * discontinuous RAM ranges on the Wii, even if this is 72 * currently unsupported on 32-bit PowerPC Linux. 73 * 74 * We coalesce the two memory ranges of the Wii into a 75 * single range, then create a reservation for the "hole" 76 * between both ranges. 77 */ 78 79 BUG_ON(memblock.memory.cnt != 2); 80 BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base)); 81 82 /* trim unaligned tail */ 83 memblock_remove(ALIGN(p[1].base + p[1].size, PAGE_SIZE), 84 (phys_addr_t)ULLONG_MAX); 85 86 /* determine hole, add & reserve them */ 87 wii_hole_start = ALIGN(p[0].base + p[0].size, PAGE_SIZE); 88 wii_hole_size = p[1].base - wii_hole_start; 89 memblock_add(wii_hole_start, wii_hole_size); 90 memblock_reserve(wii_hole_start, wii_hole_size); 91 92 BUG_ON(memblock.memory.cnt != 1); 93 __memblock_dump_all(); 94 95 /* allow ioremapping the address space in the hole */ 96 __allow_ioremap_reserved = 1; 97 } 98 99 unsigned long __init wii_mmu_mapin_mem2(unsigned long top) 100 { 101 unsigned long delta, size, bl; 102 unsigned long max_size = (256<<20); 103 104 /* MEM2 64MB@0x10000000 */ 105 delta = wii_hole_start + wii_hole_size; 106 size = top - delta; 107 for (bl = 128<<10; bl < max_size; bl <<= 1) { 108 if (bl * 2 > size) 109 break; 110 } 111 setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X); 112 return delta + bl; 113 } 114 115 static void wii_spin(void) 116 { 117 local_irq_disable(); 118 for (;;) 119 cpu_relax(); 120 } 121 122 static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible) 123 { 124 void __iomem *hw_regs = NULL; 125 struct device_node *np; 126 struct resource res; 127 int error = -ENODEV; 128 129 np = of_find_compatible_node(NULL, NULL, compatible); 130 if (!np) { 131 pr_err("no compatible node found for %s\n", compatible); 132 goto out; 133 } 134 error = of_address_to_resource(np, 0, &res); 135 if (error) { 136 pr_err("no valid reg found for %s\n", np->name); 137 goto out_put; 138 } 139 140 hw_regs = ioremap(res.start, resource_size(&res)); 141 if (hw_regs) { 142 pr_info("%s at 0x%08x mapped to 0x%p\n", name, 143 res.start, hw_regs); 144 } 145 146 out_put: 147 of_node_put(np); 148 out: 149 return hw_regs; 150 } 151 152 static void __init wii_setup_arch(void) 153 { 154 hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE); 155 hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE); 156 if (hw_gpio) { 157 /* turn off the front blue led and IR light */ 158 clrbits32(hw_gpio + HW_GPIO_OUT(0), 159 HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR); 160 } 161 } 162 163 static void wii_restart(char *cmd) 164 { 165 local_irq_disable(); 166 167 if (hw_ctrl) { 168 /* clear the system reset pin to cause a reset */ 169 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS); 170 } 171 wii_spin(); 172 } 173 174 static void wii_power_off(void) 175 { 176 local_irq_disable(); 177 178 if (hw_gpio) { 179 /* make sure that the poweroff GPIO is configured as output */ 180 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN); 181 182 /* drive the poweroff GPIO high */ 183 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN); 184 } 185 wii_spin(); 186 } 187 188 static void wii_halt(void) 189 { 190 if (ppc_md.restart) 191 ppc_md.restart(NULL); 192 wii_spin(); 193 } 194 195 static void __init wii_init_early(void) 196 { 197 ug_udbg_init(); 198 } 199 200 static void __init wii_pic_probe(void) 201 { 202 flipper_pic_probe(); 203 hlwd_pic_probe(); 204 } 205 206 static int __init wii_probe(void) 207 { 208 unsigned long dt_root; 209 210 dt_root = of_get_flat_dt_root(); 211 if (!of_flat_dt_is_compatible(dt_root, "nintendo,wii")) 212 return 0; 213 214 pm_power_off = wii_power_off; 215 216 return 1; 217 } 218 219 static void wii_shutdown(void) 220 { 221 hlwd_quiesce(); 222 flipper_quiesce(); 223 } 224 225 define_machine(wii) { 226 .name = "wii", 227 .probe = wii_probe, 228 .init_early = wii_init_early, 229 .setup_arch = wii_setup_arch, 230 .restart = wii_restart, 231 .halt = wii_halt, 232 .init_IRQ = wii_pic_probe, 233 .get_irq = flipper_pic_get_irq, 234 .calibrate_decr = generic_calibrate_decr, 235 .progress = udbg_progress, 236 .machine_shutdown = wii_shutdown, 237 }; 238 239 static const struct of_device_id wii_of_bus[] = { 240 { .compatible = "nintendo,hollywood", }, 241 { }, 242 }; 243 244 static int __init wii_device_probe(void) 245 { 246 if (!machine_is(wii)) 247 return 0; 248 249 of_platform_bus_probe(NULL, wii_of_bus, NULL); 250 return 0; 251 } 252 device_initcall(wii_device_probe); 253 254