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
page_aligned(unsigned long x)52 static int __init page_aligned(unsigned long x)
53 {
54 return !(x & (PAGE_SIZE-1));
55 }
56
wii_memory_fixups(void)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
wii_spin(void)65 static void __noreturn wii_spin(void)
66 {
67 local_irq_disable();
68 for (;;)
69 cpu_relax();
70 }
71
wii_ioremap_hw_regs(char * name,char * compatible)72 static void __iomem *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
wii_setup_arch(void)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
wii_restart(char * cmd)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
wii_power_off(void)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
wii_halt(void)144 static void __noreturn wii_halt(void)
145 {
146 if (ppc_md.restart)
147 ppc_md.restart(NULL);
148 wii_spin();
149 }
150
wii_pic_probe(void)151 static void __init wii_pic_probe(void)
152 {
153 flipper_pic_probe();
154 hlwd_pic_probe();
155 }
156
wii_probe(void)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
wii_shutdown(void)169 static void wii_shutdown(void)
170 {
171 hlwd_quiesce();
172 flipper_quiesce();
173 }
174
define_machine(wii)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
188 static const struct of_device_id wii_of_bus[] = {
189 { .compatible = "nintendo,hollywood", },
190 { },
191 };
192
wii_device_probe(void)193 static int __init wii_device_probe(void)
194 {
195 if (!machine_is(wii))
196 return 0;
197
198 of_platform_populate(NULL, wii_of_bus, NULL, NULL);
199 return 0;
200 }
201 device_initcall(wii_device_probe);
202
203