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