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%08x 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 	if (!of_machine_is_compatible("nintendo,wii"))
145 		return 0;
146 
147 	pm_power_off = wii_power_off;
148 
149 	ug_udbg_init();
150 
151 	return 1;
152 }
153 
154 static void wii_shutdown(void)
155 {
156 	hlwd_quiesce();
157 	flipper_quiesce();
158 }
159 
160 static const struct of_device_id wii_of_bus[] = {
161 	{ .compatible = "nintendo,hollywood", },
162 	{ },
163 };
164 
165 static int __init wii_device_probe(void)
166 {
167 	if (!machine_is(wii))
168 		return 0;
169 
170 	of_platform_populate(NULL, wii_of_bus, NULL, NULL);
171 	return 0;
172 }
173 device_initcall(wii_device_probe);
174 
175 define_machine(wii) {
176 	.name			= "wii",
177 	.probe			= wii_probe,
178 	.setup_arch		= wii_setup_arch,
179 	.restart		= wii_restart,
180 	.halt			= wii_halt,
181 	.init_IRQ		= wii_pic_probe,
182 	.get_irq		= flipper_pic_get_irq,
183 	.calibrate_decr		= generic_calibrate_decr,
184 	.progress		= udbg_progress,
185 	.machine_shutdown	= wii_shutdown,
186 };
187