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
87 if (__map_without_bats)
88 return delta;
89
90 for (bl = 128<<10; bl < max_size; bl <<= 1) {
91 if (bl * 2 > size)
92 break;
93 }
94 setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X);
95 return delta + bl;
96 }
97
wii_spin(void)98 static void __noreturn wii_spin(void)
99 {
100 local_irq_disable();
101 for (;;)
102 cpu_relax();
103 }
104
wii_ioremap_hw_regs(char * name,char * compatible)105 static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible)
106 {
107 void __iomem *hw_regs = NULL;
108 struct device_node *np;
109 struct resource res;
110 int error = -ENODEV;
111
112 np = of_find_compatible_node(NULL, NULL, compatible);
113 if (!np) {
114 pr_err("no compatible node found for %s\n", compatible);
115 goto out;
116 }
117 error = of_address_to_resource(np, 0, &res);
118 if (error) {
119 pr_err("no valid reg found for %s\n", np->name);
120 goto out_put;
121 }
122
123 hw_regs = ioremap(res.start, resource_size(&res));
124 if (hw_regs) {
125 pr_info("%s at 0x%08x mapped to 0x%p\n", name,
126 res.start, hw_regs);
127 }
128
129 out_put:
130 of_node_put(np);
131 out:
132 return hw_regs;
133 }
134
wii_setup_arch(void)135 static void __init wii_setup_arch(void)
136 {
137 hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE);
138 hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE);
139 if (hw_gpio) {
140 /* turn off the front blue led and IR light */
141 clrbits32(hw_gpio + HW_GPIO_OUT(0),
142 HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR);
143 }
144 }
145
wii_restart(char * cmd)146 static void __noreturn wii_restart(char *cmd)
147 {
148 local_irq_disable();
149
150 if (hw_ctrl) {
151 /* clear the system reset pin to cause a reset */
152 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS);
153 }
154 wii_spin();
155 }
156
wii_power_off(void)157 static void wii_power_off(void)
158 {
159 local_irq_disable();
160
161 if (hw_gpio) {
162 /*
163 * set the owner of the shutdown pin to ARM, because it is
164 * accessed through the registers for the ARM, below
165 */
166 clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN);
167
168 /* make sure that the poweroff GPIO is configured as output */
169 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN);
170
171 /* drive the poweroff GPIO high */
172 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN);
173 }
174 wii_spin();
175 }
176
wii_halt(void)177 static void __noreturn wii_halt(void)
178 {
179 if (ppc_md.restart)
180 ppc_md.restart(NULL);
181 wii_spin();
182 }
183
wii_pic_probe(void)184 static void __init wii_pic_probe(void)
185 {
186 flipper_pic_probe();
187 hlwd_pic_probe();
188 }
189
wii_probe(void)190 static int __init wii_probe(void)
191 {
192 if (!of_machine_is_compatible("nintendo,wii"))
193 return 0;
194
195 pm_power_off = wii_power_off;
196
197 ug_udbg_init();
198
199 return 1;
200 }
201
wii_shutdown(void)202 static void wii_shutdown(void)
203 {
204 hlwd_quiesce();
205 flipper_quiesce();
206 }
207
define_machine(wii)208 define_machine(wii) {
209 .name = "wii",
210 .probe = wii_probe,
211 .setup_arch = wii_setup_arch,
212 .restart = wii_restart,
213 .halt = wii_halt,
214 .init_IRQ = wii_pic_probe,
215 .get_irq = flipper_pic_get_irq,
216 .calibrate_decr = generic_calibrate_decr,
217 .progress = udbg_progress,
218 .machine_shutdown = wii_shutdown,
219 };
220
221 static const struct of_device_id wii_of_bus[] = {
222 { .compatible = "nintendo,hollywood", },
223 { },
224 };
225
wii_device_probe(void)226 static int __init wii_device_probe(void)
227 {
228 if (!machine_is(wii))
229 return 0;
230
231 of_platform_populate(NULL, wii_of_bus, NULL, NULL);
232 return 0;
233 }
234 device_initcall(wii_device_probe);
235
236