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/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