treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
[sfrench/cifs-2.6.git] / arch / powerpc / platforms / embedded6xx / wii.c
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
52 static int __init page_aligned(unsigned long x)
53 {
54         return !(x & (PAGE_SIZE-1));
55 }
56
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
65 static void __noreturn wii_spin(void)
66 {
67         local_irq_disable();
68         for (;;)
69                 cpu_relax();
70 }
71
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
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
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
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
144 static void __noreturn wii_halt(void)
145 {
146         if (ppc_md.restart)
147                 ppc_md.restart(NULL);
148         wii_spin();
149 }
150
151 static void __init wii_pic_probe(void)
152 {
153         flipper_pic_probe();
154         hlwd_pic_probe();
155 }
156
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
169 static void wii_shutdown(void)
170 {
171         hlwd_quiesce();
172         flipper_quiesce();
173 }
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
188 static const struct of_device_id wii_of_bus[] = {
189         { .compatible = "nintendo,hollywood", },
190         { },
191 };
192
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