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
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