arch/powerpc/platforms/embedded6xx/wii.c

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