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 *__init 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 }; 202