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
  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         return 1;
 215 }
 216
 217 static void wii_shutdown(void)
 218 {
 219         hlwd_quiesce();
 220         flipper_quiesce();
 221 }
 222
 223 define_machine(wii) {
 224         .name                   = "wii",
 225         .probe                  = wii_probe,
 226         .init_early             = wii_init_early,
 227         .setup_arch             = wii_setup_arch,
 228         .restart                = wii_restart,
 229         .power_off              = wii_power_off,
 230         .halt                   = wii_halt,
 231         .init_IRQ               = wii_pic_probe,
 232         .get_irq                = flipper_pic_get_irq,
 233         .calibrate_decr         = generic_calibrate_decr,
 234         .progress               = udbg_progress,
 235         .machine_shutdown       = wii_shutdown,
 236 };
 237
 238 static struct of_device_id wii_of_bus[] = {
 239         { .compatible = "nintendo,hollywood", },
 240         { },
 241 };
 242
 243 static int __init wii_device_probe(void)
 244 {
 245         if (!machine_is(wii))
 246                 return 0;
 247
 248         of_platform_bus_probe(NULL, wii_of_bus, NULL);
 249         return 0;
 250 }
 251 device_initcall(wii_device_probe);
 252