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5a7ee319 AH |
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/kexec.h> | |
22 | #include <linux/of_platform.h> | |
95f72d1e | 23 | #include <linux/memblock.h> |
de32400d | 24 | #include <mm/mmu_decl.h> |
5a7ee319 AH |
25 | |
26 | #include <asm/io.h> | |
27 | #include <asm/machdep.h> | |
28 | #include <asm/prom.h> | |
29 | #include <asm/time.h> | |
30 | #include <asm/udbg.h> | |
31 | ||
32 | #include "flipper-pic.h" | |
33 | #include "hlwd-pic.h" | |
34 | #include "usbgecko_udbg.h" | |
35 | ||
36 | /* control block */ | |
37 | #define HW_CTRL_COMPATIBLE "nintendo,hollywood-control" | |
38 | ||
39 | #define HW_CTRL_RESETS 0x94 | |
40 | #define HW_CTRL_RESETS_SYS (1<<0) | |
41 | ||
42 | /* gpio */ | |
43 | #define HW_GPIO_COMPATIBLE "nintendo,hollywood-gpio" | |
44 | ||
45 | #define HW_GPIO_BASE(idx) (idx * 0x20) | |
46 | #define HW_GPIO_OUT(idx) (HW_GPIO_BASE(idx) + 0) | |
47 | #define HW_GPIO_DIR(idx) (HW_GPIO_BASE(idx) + 4) | |
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 | ||
de32400d AH |
57 | unsigned long wii_hole_start; |
58 | unsigned long wii_hole_size; | |
59 | ||
60 | ||
61 | static int __init page_aligned(unsigned long x) | |
62 | { | |
63 | return !(x & (PAGE_SIZE-1)); | |
64 | } | |
65 | ||
66 | void __init wii_memory_fixups(void) | |
67 | { | |
e3239ff9 | 68 | struct memblock_region *p = memblock.memory.region; |
de32400d AH |
69 | |
70 | /* | |
71 | * This is part of a workaround to allow the use of two | |
c4b9f9a9 | 72 | * discontinuous RAM ranges on the Wii, even if this is |
de32400d AH |
73 | * currently unsupported on 32-bit PowerPC Linux. |
74 | * | |
c4b9f9a9 | 75 | * We coalesce the two memory ranges of the Wii into a |
de32400d AH |
76 | * single range, then create a reservation for the "hole" |
77 | * between both ranges. | |
78 | */ | |
79 | ||
95f72d1e | 80 | BUG_ON(memblock.memory.cnt != 2); |
de32400d AH |
81 | BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base)); |
82 | ||
83 | p[0].size = _ALIGN_DOWN(p[0].size, PAGE_SIZE); | |
84 | p[1].size = _ALIGN_DOWN(p[1].size, PAGE_SIZE); | |
85 | ||
86 | wii_hole_start = p[0].base + p[0].size; | |
87 | wii_hole_size = p[1].base - wii_hole_start; | |
88 | ||
89 | pr_info("MEM1: <%08llx %08llx>\n", p[0].base, p[0].size); | |
90 | pr_info("HOLE: <%08lx %08lx>\n", wii_hole_start, wii_hole_size); | |
91 | pr_info("MEM2: <%08llx %08llx>\n", p[1].base, p[1].size); | |
92 | ||
93 | p[0].size += wii_hole_size + p[1].size; | |
94 | ||
95f72d1e YL |
95 | memblock.memory.cnt = 1; |
96 | memblock_analyze(); | |
de32400d AH |
97 | |
98 | /* reserve the hole */ | |
95f72d1e | 99 | memblock_reserve(wii_hole_start, wii_hole_size); |
c0577eee AH |
100 | |
101 | /* allow ioremapping the address space in the hole */ | |
102 | __allow_ioremap_reserved = 1; | |
de32400d AH |
103 | } |
104 | ||
105 | unsigned long __init wii_mmu_mapin_mem2(unsigned long top) | |
106 | { | |
107 | unsigned long delta, size, bl; | |
108 | unsigned long max_size = (256<<20); | |
109 | ||
110 | /* MEM2 64MB@0x10000000 */ | |
111 | delta = wii_hole_start + wii_hole_size; | |
112 | size = top - delta; | |
113 | for (bl = 128<<10; bl < max_size; bl <<= 1) { | |
114 | if (bl * 2 > size) | |
115 | break; | |
116 | } | |
117 | setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X); | |
118 | return delta + bl; | |
119 | } | |
120 | ||
5a7ee319 AH |
121 | static void wii_spin(void) |
122 | { | |
123 | local_irq_disable(); | |
124 | for (;;) | |
125 | cpu_relax(); | |
126 | } | |
127 | ||
128 | static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible) | |
129 | { | |
130 | void __iomem *hw_regs = NULL; | |
131 | struct device_node *np; | |
132 | struct resource res; | |
133 | int error = -ENODEV; | |
134 | ||
135 | np = of_find_compatible_node(NULL, NULL, compatible); | |
136 | if (!np) { | |
137 | pr_err("no compatible node found for %s\n", compatible); | |
138 | goto out; | |
139 | } | |
140 | error = of_address_to_resource(np, 0, &res); | |
141 | if (error) { | |
142 | pr_err("no valid reg found for %s\n", np->name); | |
143 | goto out_put; | |
144 | } | |
145 | ||
146 | hw_regs = ioremap(res.start, resource_size(&res)); | |
147 | if (hw_regs) { | |
148 | pr_info("%s at 0x%08x mapped to 0x%p\n", name, | |
149 | res.start, hw_regs); | |
150 | } | |
151 | ||
152 | out_put: | |
153 | of_node_put(np); | |
154 | out: | |
155 | return hw_regs; | |
156 | } | |
157 | ||
158 | static void __init wii_setup_arch(void) | |
159 | { | |
160 | hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE); | |
161 | hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE); | |
162 | if (hw_gpio) { | |
163 | /* turn off the front blue led and IR light */ | |
164 | clrbits32(hw_gpio + HW_GPIO_OUT(0), | |
165 | HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR); | |
166 | } | |
167 | } | |
168 | ||
169 | static void wii_restart(char *cmd) | |
170 | { | |
171 | local_irq_disable(); | |
172 | ||
173 | if (hw_ctrl) { | |
174 | /* clear the system reset pin to cause a reset */ | |
175 | clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS); | |
176 | } | |
177 | wii_spin(); | |
178 | } | |
179 | ||
180 | static void wii_power_off(void) | |
181 | { | |
182 | local_irq_disable(); | |
183 | ||
184 | if (hw_gpio) { | |
185 | /* make sure that the poweroff GPIO is configured as output */ | |
186 | setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN); | |
187 | ||
188 | /* drive the poweroff GPIO high */ | |
189 | setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN); | |
190 | } | |
191 | wii_spin(); | |
192 | } | |
193 | ||
194 | static void wii_halt(void) | |
195 | { | |
196 | if (ppc_md.restart) | |
197 | ppc_md.restart(NULL); | |
198 | wii_spin(); | |
199 | } | |
200 | ||
201 | static void __init wii_init_early(void) | |
202 | { | |
203 | ug_udbg_init(); | |
204 | } | |
205 | ||
206 | static void __init wii_pic_probe(void) | |
207 | { | |
208 | flipper_pic_probe(); | |
209 | hlwd_pic_probe(); | |
210 | } | |
211 | ||
212 | static int __init wii_probe(void) | |
213 | { | |
214 | unsigned long dt_root; | |
215 | ||
216 | dt_root = of_get_flat_dt_root(); | |
217 | if (!of_flat_dt_is_compatible(dt_root, "nintendo,wii")) | |
218 | return 0; | |
219 | ||
220 | return 1; | |
221 | } | |
222 | ||
223 | static void wii_shutdown(void) | |
224 | { | |
225 | hlwd_quiesce(); | |
226 | flipper_quiesce(); | |
227 | } | |
228 | ||
229 | #ifdef CONFIG_KEXEC | |
230 | static int wii_machine_kexec_prepare(struct kimage *image) | |
231 | { | |
232 | return 0; | |
233 | } | |
234 | #endif /* CONFIG_KEXEC */ | |
235 | ||
236 | define_machine(wii) { | |
237 | .name = "wii", | |
238 | .probe = wii_probe, | |
239 | .init_early = wii_init_early, | |
240 | .setup_arch = wii_setup_arch, | |
241 | .restart = wii_restart, | |
242 | .power_off = wii_power_off, | |
243 | .halt = wii_halt, | |
244 | .init_IRQ = wii_pic_probe, | |
245 | .get_irq = flipper_pic_get_irq, | |
246 | .calibrate_decr = generic_calibrate_decr, | |
247 | .progress = udbg_progress, | |
248 | .machine_shutdown = wii_shutdown, | |
249 | #ifdef CONFIG_KEXEC | |
250 | .machine_kexec_prepare = wii_machine_kexec_prepare, | |
251 | #endif | |
252 | }; | |
253 | ||
254 | static struct of_device_id wii_of_bus[] = { | |
255 | { .compatible = "nintendo,hollywood", }, | |
256 | { }, | |
257 | }; | |
258 | ||
259 | static int __init wii_device_probe(void) | |
260 | { | |
261 | if (!machine_is(wii)) | |
262 | return 0; | |
263 | ||
264 | of_platform_bus_probe(NULL, wii_of_bus, NULL); | |
265 | return 0; | |
266 | } | |
267 | device_initcall(wii_device_probe); | |
268 |