1 /*
2 * arch/powerpc/platforms/embedded6xx/wii.c
3 *
4 * Nintendo Wii board-specific support
5 * Copyright (C) 2008-2009 The GameCube Linux Team
6 * Copyright (C) 2008,2009 Albert Herranz
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 *
13 */
14 #define DRV_MODULE_NAME "wii"
15 #define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
16
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/irq.h>
20 #include <linux/seq_file.h>
21 #include <linux/of_platform.h>
22 #include <linux/memblock.h>
23 #include <mm/mmu_decl.h>
24
25 #include <asm/io.h>
26 #include <asm/machdep.h>
27 #include <asm/prom.h>
28 #include <asm/time.h>
29 #include <asm/udbg.h>
30
31 #include "flipper-pic.h"
32 #include "hlwd-pic.h"
33 #include "usbgecko_udbg.h"
34
35 /* control block */
36 #define HW_CTRL_COMPATIBLE "nintendo,hollywood-control"
37
38 #define HW_CTRL_RESETS 0x94
39 #define HW_CTRL_RESETS_SYS (1<<0)
40
41 /* gpio */
42 #define HW_GPIO_COMPATIBLE "nintendo,hollywood-gpio"
43
44 #define HW_GPIO_BASE(idx) (idx * 0x20)
45 #define HW_GPIO_OUT(idx) (HW_GPIO_BASE(idx) + 0)
46 #define HW_GPIO_DIR(idx) (HW_GPIO_BASE(idx) + 4)
47 #define HW_GPIO_OWNER (HW_GPIO_BASE(1) + 0x1c)
48
49 #define HW_GPIO_SHUTDOWN (1<<1)
50 #define HW_GPIO_SLOT_LED (1<<5)
51 #define HW_GPIO_SENSOR_BAR (1<<8)
52
53
54 static void __iomem *hw_ctrl;
55 static void __iomem *hw_gpio;
56
57 unsigned long wii_hole_start;
58 unsigned long wii_hole_size;
59
60
page_aligned(unsigned long x)61 static int __init page_aligned(unsigned long x)
62 {
63 return !(x & (PAGE_SIZE-1));
64 }
65
wii_memory_fixups(void)66 void __init wii_memory_fixups(void)
67 {
68 struct memblock_region *p = memblock.memory.regions;
69
70 BUG_ON(memblock.memory.cnt != 2);
71 BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base));
72
73 /* determine hole */
74 wii_hole_start = ALIGN(p[0].base + p[0].size, PAGE_SIZE);
75 wii_hole_size = p[1].base - wii_hole_start;
76 }
77
wii_mmu_mapin_mem2(unsigned long top)78 unsigned long __init wii_mmu_mapin_mem2(unsigned long top)
79 {
80 unsigned long delta, size, bl;
81 unsigned long max_size = (256<<20);
82
83 /* MEM2 64MB@0x10000000 */
84 delta = wii_hole_start + wii_hole_size;
85 size = top - delta;
86 for (bl = 128<<10; bl < max_size; bl <<= 1) {
87 if (bl * 2 > size)
88 break;
89 }
90 setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X);
91 return delta + bl;
92 }
93
wii_spin(void)94 static void __noreturn wii_spin(void)
95 {
96 local_irq_disable();
97 for (;;)
98 cpu_relax();
99 }
100
wii_ioremap_hw_regs(char * name,char * compatible)101 static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible)
102 {
103 void __iomem *hw_regs = NULL;
104 struct device_node *np;
105 struct resource res;
106 int error = -ENODEV;
107
108 np = of_find_compatible_node(NULL, NULL, compatible);
109 if (!np) {
110 pr_err("no compatible node found for %s\n", compatible);
111 goto out;
112 }
113 error = of_address_to_resource(np, 0, &res);
114 if (error) {
115 pr_err("no valid reg found for %s\n", np->name);
116 goto out_put;
117 }
118
119 hw_regs = ioremap(res.start, resource_size(&res));
120 if (hw_regs) {
121 pr_info("%s at 0x%08x mapped to 0x%p\n", name,
122 res.start, hw_regs);
123 }
124
125 out_put:
126 of_node_put(np);
127 out:
128 return hw_regs;
129 }
130
wii_setup_arch(void)131 static void __init wii_setup_arch(void)
132 {
133 hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE);
134 hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE);
135 if (hw_gpio) {
136 /* turn off the front blue led and IR light */
137 clrbits32(hw_gpio + HW_GPIO_OUT(0),
138 HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR);
139 }
140 }
141
wii_restart(char * cmd)142 static void __noreturn wii_restart(char *cmd)
143 {
144 local_irq_disable();
145
146 if (hw_ctrl) {
147 /* clear the system reset pin to cause a reset */
148 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS);
149 }
150 wii_spin();
151 }
152
wii_power_off(void)153 static void wii_power_off(void)
154 {
155 local_irq_disable();
156
157 if (hw_gpio) {
158 /*
159 * set the owner of the shutdown pin to ARM, because it is
160 * accessed through the registers for the ARM, below
161 */
162 clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN);
163
164 /* make sure that the poweroff GPIO is configured as output */
165 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN);
166
167 /* drive the poweroff GPIO high */
168 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN);
169 }
170 wii_spin();
171 }
172
wii_halt(void)173 static void __noreturn wii_halt(void)
174 {
175 if (ppc_md.restart)
176 ppc_md.restart(NULL);
177 wii_spin();
178 }
179
wii_pic_probe(void)180 static void __init wii_pic_probe(void)
181 {
182 flipper_pic_probe();
183 hlwd_pic_probe();
184 }
185
wii_probe(void)186 static int __init wii_probe(void)
187 {
188 if (!of_machine_is_compatible("nintendo,wii"))
189 return 0;
190
191 pm_power_off = wii_power_off;
192
193 ug_udbg_init();
194
195 return 1;
196 }
197
wii_shutdown(void)198 static void wii_shutdown(void)
199 {
200 hlwd_quiesce();
201 flipper_quiesce();
202 }
203
define_machine(wii)204 define_machine(wii) {
205 .name = "wii",
206 .probe = wii_probe,
207 .setup_arch = wii_setup_arch,
208 .restart = wii_restart,
209 .halt = wii_halt,
210 .init_IRQ = wii_pic_probe,
211 .get_irq = flipper_pic_get_irq,
212 .calibrate_decr = generic_calibrate_decr,
213 .progress = udbg_progress,
214 .machine_shutdown = wii_shutdown,
215 };
216
217 static const struct of_device_id wii_of_bus[] = {
218 { .compatible = "nintendo,hollywood", },
219 { },
220 };
221
wii_device_probe(void)222 static int __init wii_device_probe(void)
223 {
224 if (!machine_is(wii))
225 return 0;
226
227 of_platform_populate(NULL, wii_of_bus, NULL, NULL);
228 return 0;
229 }
230 device_initcall(wii_device_probe);
231
232
