arch/powerpc/platforms/embedded6xx/wii.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * arch/powerpc/platforms/embedded6xx/wii.c
   4  *
   5  * Nintendo Wii board-specific support
   6  * Copyright (C) 2008-2009 The GameCube Linux Team
   7  * Copyright (C) 2008,2009 Albert Herranz
   8  */
   9 #define DRV_MODULE_NAME "wii"
  10 #define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/irq.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/memblock.h>
  18 #include <mm/mmu_decl.h>
  19
  20 #include <asm/io.h>
  21 #include <asm/machdep.h>
  22 #include <asm/prom.h>
  23 #include <asm/time.h>
  24 #include <asm/udbg.h>
  25
  26 #include "flipper-pic.h"
  27 #include "hlwd-pic.h"
  28 #include "usbgecko_udbg.h"
  29
  30 /* control block */
  31 #define HW_CTRL_COMPATIBLE      "nintendo,hollywood-control"
  32
  33 #define HW_CTRL_RESETS          0x94
  34 #define HW_CTRL_RESETS_SYS      (1<<0)
  35
  36 /* gpio */
  37 #define HW_GPIO_COMPATIBLE      "nintendo,hollywood-gpio"
  38
  39 #define HW_GPIO_BASE(idx)       (idx * 0x20)
  40 #define HW_GPIO_OUT(idx)        (HW_GPIO_BASE(idx) + 0)
  41 #define HW_GPIO_DIR(idx)        (HW_GPIO_BASE(idx) + 4)
  42 #define HW_GPIO_OWNER           (HW_GPIO_BASE(1) + 0x1c)
  43
  44 #define HW_GPIO_SHUTDOWN        (1<<1)
  45 #define HW_GPIO_SLOT_LED        (1<<5)
  46 #define HW_GPIO_SENSOR_BAR      (1<<8)
  47
  48
  49 static void __iomem *hw_ctrl;
  50 static void __iomem *hw_gpio;
  51
  52 static int __init page_aligned(unsigned long x)
  53 {
  54         return !(x & (PAGE_SIZE-1));
  55 }
  56
  57 void __init wii_memory_fixups(void)
  58 {
  59         struct memblock_region *p = memblock.memory.regions;
  60
  61         BUG_ON(memblock.memory.cnt != 2);
  62         BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base));
  63 }
  64
  65 static void __noreturn wii_spin(void)
  66 {
  67         local_irq_disable();
  68         for (;;)
  69                 cpu_relax();
  70 }
  71
  72 static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible)
  73 {
  74         void __iomem *hw_regs = NULL;
  75         struct device_node *np;
  76         struct resource res;
  77         int error = -ENODEV;
  78
  79         np = of_find_compatible_node(NULL, NULL, compatible);
  80         if (!np) {
  81                 pr_err("no compatible node found for %s\n", compatible);
  82                 goto out;
  83         }
  84         error = of_address_to_resource(np, 0, &res);
  85         if (error) {
  86                 pr_err("no valid reg found for %pOFn\n", np);
  87                 goto out_put;
  88         }
  89
  90         hw_regs = ioremap(res.start, resource_size(&res));
  91         if (hw_regs) {
  92                 pr_info("%s at 0x%08x mapped to 0x%p\n", name,
  93                         res.start, hw_regs);
  94         }
  95
  96 out_put:
  97         of_node_put(np);
  98 out:
  99         return hw_regs;
 100 }
 101
 102 static void __init wii_setup_arch(void)
 103 {
 104         hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE);
 105         hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE);
 106         if (hw_gpio) {
 107                 /* turn off the front blue led and IR light */
 108                 clrbits32(hw_gpio + HW_GPIO_OUT(0),
 109                           HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR);
 110         }
 111 }
 112
 113 static void __noreturn wii_restart(char *cmd)
 114 {
 115         local_irq_disable();
 116
 117         if (hw_ctrl) {
 118                 /* clear the system reset pin to cause a reset */
 119                 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS);
 120         }
 121         wii_spin();
 122 }
 123
 124 static void wii_power_off(void)
 125 {
 126         local_irq_disable();
 127
 128         if (hw_gpio) {
 129                 /*
 130                  * set the owner of the shutdown pin to ARM, because it is
 131                  * accessed through the registers for the ARM, below
 132                  */
 133                 clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN);
 134
 135                 /* make sure that the poweroff GPIO is configured as output */
 136                 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN);
 137
 138                 /* drive the poweroff GPIO high */
 139                 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN);
 140         }
 141         wii_spin();
 142 }
 143
 144 static void __noreturn wii_halt(void)
 145 {
 146         if (ppc_md.restart)
 147                 ppc_md.restart(NULL);
 148         wii_spin();
 149 }
 150
 151 static void __init wii_pic_probe(void)
 152 {
 153         flipper_pic_probe();
 154         hlwd_pic_probe();
 155 }
 156
 157 static int __init wii_probe(void)
 158 {
 159         if (!of_machine_is_compatible("nintendo,wii"))
 160                 return 0;
 161
 162         pm_power_off = wii_power_off;
 163
 164         ug_udbg_init();
 165
 166         return 1;
 167 }
 168
 169 static void wii_shutdown(void)
 170 {
 171         hlwd_quiesce();
 172         flipper_quiesce();
 173 }
 174
 175 static const struct of_device_id wii_of_bus[] = {
 176         { .compatible = "nintendo,hollywood", },
 177         { },
 178 };
 179
 180 static int __init wii_device_probe(void)
 181 {
 182         if (!machine_is(wii))
 183                 return 0;
 184
 185         of_platform_populate(NULL, wii_of_bus, NULL, NULL);
 186         return 0;
 187 }
 188 device_initcall(wii_device_probe);
 189
 190 define_machine(wii) {
 191         .name                   = "wii",
 192         .probe                  = wii_probe,
 193         .setup_arch             = wii_setup_arch,
 194         .restart                = wii_restart,
 195         .halt                   = wii_halt,
 196         .init_IRQ               = wii_pic_probe,
 197         .get_irq                = flipper_pic_get_irq,
 198         .calibrate_decr         = generic_calibrate_decr,
 199         .progress               = udbg_progress,
 200         .machine_shutdown       = wii_shutdown,
 201 };