xref: /linux/arch/powerpc/platforms/embedded6xx/wii.c (revision 0d456bad36d42d16022be045c8a53ddbb59ee478) 
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 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 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 wii_halt(void)
189 {
190 	if (ppc_md.restart)
191 		ppc_md.restart(NULL);
192 	wii_spin();
193 }
194 
195 static void __init wii_init_early(void)
196 {
197 	ug_udbg_init();
198 }
199 
200 static void __init wii_pic_probe(void)
201 {
202 	flipper_pic_probe();
203 	hlwd_pic_probe();
204 }
205 
206 static int __init wii_probe(void)
207 {
208 	unsigned long dt_root;
209 
210 	dt_root = of_get_flat_dt_root();
211 	if (!of_flat_dt_is_compatible(dt_root, "nintendo,wii"))
212 		return 0;
213 
214 	return 1;
215 }
216 
217 static void wii_shutdown(void)
218 {
219 	hlwd_quiesce();
220 	flipper_quiesce();
221 }
222 
223 define_machine(wii) {
224 	.name			= "wii",
225 	.probe			= wii_probe,
226 	.init_early		= wii_init_early,
227 	.setup_arch		= wii_setup_arch,
228 	.restart		= wii_restart,
229 	.power_off		= wii_power_off,
230 	.halt			= wii_halt,
231 	.init_IRQ		= wii_pic_probe,
232 	.get_irq		= flipper_pic_get_irq,
233 	.calibrate_decr		= generic_calibrate_decr,
234 	.progress		= udbg_progress,
235 	.machine_shutdown	= wii_shutdown,
236 };
237 
238 static struct of_device_id wii_of_bus[] = {
239 	{ .compatible = "nintendo,hollywood", },
240 	{ },
241 };
242 
243 static int __init wii_device_probe(void)
244 {
245 	if (!machine_is(wii))
246 		return 0;
247 
248 	of_platform_bus_probe(NULL, wii_of_bus, NULL);
249 	return 0;
250 }
251 device_initcall(wii_device_probe);
252 
253