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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 };
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