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_address.h> 17 #include <linux/of_platform.h> 18 19 #include <asm/io.h> 20 #include <asm/machdep.h> 21 #include <asm/time.h> 22 #include <asm/udbg.h> 23 24 #include "flipper-pic.h" 25 #include "hlwd-pic.h" 26 #include "usbgecko_udbg.h" 27 28 /* control block */ 29 #define HW_CTRL_COMPATIBLE "nintendo,hollywood-control" 30 31 #define HW_CTRL_RESETS 0x94 32 #define HW_CTRL_RESETS_SYS (1<<0) 33 34 /* gpio */ 35 #define HW_GPIO_COMPATIBLE "nintendo,hollywood-gpio" 36 37 #define HW_GPIO_BASE(idx) (idx * 0x20) 38 #define HW_GPIO_OUT(idx) (HW_GPIO_BASE(idx) + 0) 39 #define HW_GPIO_DIR(idx) (HW_GPIO_BASE(idx) + 4) 40 #define HW_GPIO_OWNER (HW_GPIO_BASE(1) + 0x1c) 41 42 #define HW_GPIO_SHUTDOWN (1<<1) 43 #define HW_GPIO_SLOT_LED (1<<5) 44 #define HW_GPIO_SENSOR_BAR (1<<8) 45 46 47 static void __iomem *hw_ctrl; 48 static void __iomem *hw_gpio; 49 50 static void __noreturn wii_spin(void) 51 { 52 local_irq_disable(); 53 for (;;) 54 cpu_relax(); 55 } 56 57 static void __iomem *__init wii_ioremap_hw_regs(char *name, char *compatible) 58 { 59 void __iomem *hw_regs = NULL; 60 struct device_node *np; 61 struct resource res; 62 int error = -ENODEV; 63 64 np = of_find_compatible_node(NULL, NULL, compatible); 65 if (!np) { 66 pr_err("no compatible node found for %s\n", compatible); 67 goto out; 68 } 69 error = of_address_to_resource(np, 0, &res); 70 if (error) { 71 pr_err("no valid reg found for %pOFn\n", np); 72 goto out_put; 73 } 74 75 hw_regs = ioremap(res.start, resource_size(&res)); 76 if (hw_regs) { 77 pr_info("%s at 0x%pa mapped to 0x%p\n", name, 78 &res.start, hw_regs); 79 } 80 81 out_put: 82 of_node_put(np); 83 out: 84 return hw_regs; 85 } 86 87 static void __init wii_setup_arch(void) 88 { 89 hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE); 90 hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE); 91 if (hw_gpio) { 92 /* turn off the front blue led and IR light */ 93 clrbits32(hw_gpio + HW_GPIO_OUT(0), 94 HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR); 95 } 96 } 97 98 static void __noreturn wii_restart(char *cmd) 99 { 100 local_irq_disable(); 101 102 if (hw_ctrl) { 103 /* clear the system reset pin to cause a reset */ 104 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS); 105 } 106 wii_spin(); 107 } 108 109 static void wii_power_off(void) 110 { 111 local_irq_disable(); 112 113 if (hw_gpio) { 114 /* 115 * set the owner of the shutdown pin to ARM, because it is 116 * accessed through the registers for the ARM, below 117 */ 118 clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN); 119 120 /* make sure that the poweroff GPIO is configured as output */ 121 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN); 122 123 /* drive the poweroff GPIO high */ 124 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN); 125 } 126 wii_spin(); 127 } 128 129 static void __noreturn wii_halt(void) 130 { 131 if (ppc_md.restart) 132 ppc_md.restart(NULL); 133 wii_spin(); 134 } 135 136 static void __init wii_pic_probe(void) 137 { 138 flipper_pic_probe(); 139 hlwd_pic_probe(); 140 } 141 142 static int __init wii_probe(void) 143 { 144 pm_power_off = wii_power_off; 145 146 ug_udbg_init(); 147 148 return 1; 149 } 150 151 static void wii_shutdown(void) 152 { 153 hlwd_quiesce(); 154 flipper_quiesce(); 155 } 156 157 static const struct of_device_id wii_of_bus[] = { 158 { .compatible = "nintendo,hollywood", }, 159 { }, 160 }; 161 162 static int __init wii_device_probe(void) 163 { 164 of_platform_populate(NULL, wii_of_bus, NULL, NULL); 165 return 0; 166 } 167 machine_device_initcall(wii, wii_device_probe); 168 169 define_machine(wii) { 170 .name = "wii", 171 .compatible = "nintendo,wii", 172 .probe = wii_probe, 173 .setup_arch = wii_setup_arch, 174 .restart = wii_restart, 175 .halt = wii_halt, 176 .init_IRQ = wii_pic_probe, 177 .get_irq = flipper_pic_get_irq, 178 .progress = udbg_progress, 179 .machine_shutdown = wii_shutdown, 180 }; 181