1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * arch/powerpc/platforms/embedded6xx/wii.c
5 * Nintendo Wii board-specific support
6 * Copyright (C) 2008-2009 The GameCube Linux Team
7 * Copyright (C) 2008,2009 Albert Herranz
9 #define DRV_MODULE_NAME "wii"
10 #define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
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>
21 #include <asm/machdep.h>
26 #include "flipper-pic.h"
28 #include "usbgecko_udbg.h"
31 #define HW_CTRL_COMPATIBLE "nintendo,hollywood-control"
33 #define HW_CTRL_RESETS 0x94
34 #define HW_CTRL_RESETS_SYS (1<<0)
37 #define HW_GPIO_COMPATIBLE "nintendo,hollywood-gpio"
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)
44 #define HW_GPIO_SHUTDOWN (1<<1)
45 #define HW_GPIO_SLOT_LED (1<<5)
46 #define HW_GPIO_SENSOR_BAR (1<<8)
49 static void __iomem *hw_ctrl;
50 static void __iomem *hw_gpio;
52 static int __init page_aligned(unsigned long x)
54 return !(x & (PAGE_SIZE-1));
57 void __init wii_memory_fixups(void)
59 struct memblock_region *p = memblock.memory.regions;
61 BUG_ON(memblock.memory.cnt != 2);
62 BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base));
65 static void __noreturn wii_spin(void)
72 static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible)
74 void __iomem *hw_regs = NULL;
75 struct device_node *np;
79 np = of_find_compatible_node(NULL, NULL, compatible);
81 pr_err("no compatible node found for %s\n", compatible);
84 error = of_address_to_resource(np, 0, &res);
86 pr_err("no valid reg found for %pOFn\n", np);
90 hw_regs = ioremap(res.start, resource_size(&res));
92 pr_info("%s at 0x%pa mapped to 0x%p\n", name,
102 static void __init wii_setup_arch(void)
104 hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE);
105 hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE);
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);
113 static void __noreturn wii_restart(char *cmd)
118 /* clear the system reset pin to cause a reset */
119 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS);
124 static void wii_power_off(void)
130 * set the owner of the shutdown pin to ARM, because it is
131 * accessed through the registers for the ARM, below
133 clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN);
135 /* make sure that the poweroff GPIO is configured as output */
136 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN);
138 /* drive the poweroff GPIO high */
139 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN);
144 static void __noreturn wii_halt(void)
147 ppc_md.restart(NULL);
151 static void __init wii_pic_probe(void)
157 static int __init wii_probe(void)
159 if (!of_machine_is_compatible("nintendo,wii"))
162 pm_power_off = wii_power_off;
169 static void wii_shutdown(void)
175 static const struct of_device_id wii_of_bus[] = {
176 { .compatible = "nintendo,hollywood", },
180 static int __init wii_device_probe(void)
182 if (!machine_is(wii))
185 of_platform_populate(NULL, wii_of_bus, NULL, NULL);
188 device_initcall(wii_device_probe);
190 define_machine(wii) {
193 .setup_arch = wii_setup_arch,
194 .restart = wii_restart,
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,