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
48 #define HW_GPIO_SHUTDOWN (1<<1)
49 #define HW_GPIO_SLOT_LED (1<<5)
50 #define HW_GPIO_SENSOR_BAR (1<<8)
51
52
53 static void __iomem *hw_ctrl;
54 static void __iomem *hw_gpio;
55
56 unsigned long wii_hole_start;
57 unsigned long wii_hole_size;
58
59
60 static int __init page_aligned(unsigned long x)
61 {
62 return !(x & (PAGE_SIZE-1));
63 }
64
65 void __init wii_memory_fixups(void)
66 {
67 struct memblock_region *p = memblock.memory.regions;
68
69 /*
70 * This is part of a workaround to allow the use of two
71 * discontinuous RAM ranges on the Wii, even if this is
72 * currently unsupported on 32-bit PowerPC Linux.
73 *
74 * We coalesce the two memory ranges of the Wii into a
75 * single range, then create a reservation for the "hole"
76 * between both ranges.
77 */
78
79 BUG_ON(memblock.memory.cnt != 2);
80 BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base));
81
82 /* trim unaligned tail */
83 memblock_remove(ALIGN(p[1].base + p[1].size, PAGE_SIZE),
84 (phys_addr_t)ULLONG_MAX);
85
86 /* determine hole, add & reserve them */
87 wii_hole_start = ALIGN(p[0].base + p[0].size, PAGE_SIZE);
88 wii_hole_size = p[1].base - wii_hole_start;
89 memblock_add(wii_hole_start, wii_hole_size);
90 memblock_reserve(wii_hole_start, wii_hole_size);
91
92 BUG_ON(memblock.memory.cnt != 1);
93 __memblock_dump_all();
94
95 /* allow ioremapping the address space in the hole */
96 __allow_ioremap_reserved = 1;
97 }
98
99 unsigned long __init wii_mmu_mapin_mem2(unsigned long top)
100 {
101 unsigned long delta, size, bl;
102 unsigned long max_size = (256<<20);
103
104 /* MEM2 64MB@0x10000000 */
105 delta = wii_hole_start + wii_hole_size;
106 size = top - delta;
107 for (bl = 128<<10; bl < max_size; bl <<= 1) {
108 if (bl * 2 > size)
109 break;
110 }
111 setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X);
112 return delta + bl;
113 }
114
115 static void __noreturn wii_spin(void)
116 {
117 local_irq_disable();
118 for (;;)
119 cpu_relax();
120 }
121
122 static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible)
123 {
124 void __iomem *hw_regs = NULL;
125 struct device_node *np;
126 struct resource res;
127 int error = -ENODEV;
128
129 np = of_find_compatible_node(NULL, NULL, compatible);
130 if (!np) {
131 pr_err("no compatible node found for %s\n", compatible);
132 goto out;
133 }
134 error = of_address_to_resource(np, 0, &res);
135 if (error) {
136 pr_err("no valid reg found for %s\n", np->name);
137 goto out_put;
138 }
139
140 hw_regs = ioremap(res.start, resource_size(&res));
141 if (hw_regs) {
142 pr_info("%s at 0x%08x mapped to 0x%p\n", name,
143 res.start, hw_regs);
144 }
145
146 out_put:
147 of_node_put(np);
148 out:
149 return hw_regs;
150 }
151
152 static void __init wii_setup_arch(void)
153 {
154 hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE);
155 hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE);
156 if (hw_gpio) {
157 /* turn off the front blue led and IR light */
158 clrbits32(hw_gpio + HW_GPIO_OUT(0),
159 HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR);
160 }
161 }
162
163 static void __noreturn wii_restart(char *cmd)
164 {
165 local_irq_disable();
166
167 if (hw_ctrl) {
168 /* clear the system reset pin to cause a reset */
169 clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS);
170 }
171 wii_spin();
172 }
173
174 static void wii_power_off(void)
175 {
176 local_irq_disable();
177
178 if (hw_gpio) {
179 /* make sure that the poweroff GPIO is configured as output */
180 setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN);
181
182 /* drive the poweroff GPIO high */
183 setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN);
184 }
185 wii_spin();
186 }
187
188 static void __noreturn wii_halt(void)
189 {
190 if (ppc_md.restart)
191 ppc_md.restart(NULL);
192 wii_spin();
193 }
194
195 static void __init wii_pic_probe(void)
196 {
197 flipper_pic_probe();
198 hlwd_pic_probe();
199 }
200
201 static int __init wii_probe(void)
202 {
203 if (!of_machine_is_compatible("nintendo,wii"))
204 return 0;
205
206 pm_power_off = wii_power_off;
207
208 ug_udbg_init();
209
210 return 1;
211 }
212
213 static void wii_shutdown(void)
214 {
215 hlwd_quiesce();
216 flipper_quiesce();
217 }
218
219 define_machine(wii) {
220 .name = "wii",
221 .probe = wii_probe,
222 .setup_arch = wii_setup_arch,
223 .restart = wii_restart,
224 .halt = wii_halt,
225 .init_IRQ = wii_pic_probe,
226 .get_irq = flipper_pic_get_irq,
227 .calibrate_decr = generic_calibrate_decr,
228 .progress = udbg_progress,
229 .machine_shutdown = wii_shutdown,
230 };
231
232 static const struct of_device_id wii_of_bus[] = {
233 { .compatible = "nintendo,hollywood", },
234 { },
235 };
236
237 static int __init wii_device_probe(void)
238 {
239 if (!machine_is(wii))
240 return 0;
241
242 of_platform_bus_probe(NULL, wii_of_bus, NULL);
243 return 0;
244 }
245 device_initcall(wii_device_probe);
246
247
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