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
53static void __iomem *hw_ctrl;
54static void __iomem *hw_gpio;
55
56unsigned long wii_hole_start;
57unsigned long wii_hole_size;
58
59
60static int __init page_aligned(unsigned long x)
61{
62	return !(x & (PAGE_SIZE-1));
63}
64
65void __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
99unsigned 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
115static void wii_spin(void)
116{
117	local_irq_disable();
118	for (;;)
119		cpu_relax();
120}
121
122static 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
146out_put:
147	of_node_put(np);
148out:
149	return hw_regs;
150}
151
152static 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
163static 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
174static 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
188static void wii_halt(void)
189{
190	if (ppc_md.restart)
191		ppc_md.restart(NULL);
192	wii_spin();
193}
194
195static void __init wii_init_early(void)
196{
197	ug_udbg_init();
198}
199
200static void __init wii_pic_probe(void)
201{
202	flipper_pic_probe();
203	hlwd_pic_probe();
204}
205
206static 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	pm_power_off = wii_power_off;
215
216	return 1;
217}
218
219static void wii_shutdown(void)
220{
221	hlwd_quiesce();
222	flipper_quiesce();
223}
224
225define_machine(wii) {
226	.name			= "wii",
227	.probe			= wii_probe,
228	.init_early		= wii_init_early,
229	.setup_arch		= wii_setup_arch,
230	.restart		= wii_restart,
231	.halt			= wii_halt,
232	.init_IRQ		= wii_pic_probe,
233	.get_irq		= flipper_pic_get_irq,
234	.calibrate_decr		= generic_calibrate_decr,
235	.progress		= udbg_progress,
236	.machine_shutdown	= wii_shutdown,
237};
238
239static const struct of_device_id wii_of_bus[] = {
240	{ .compatible = "nintendo,hollywood", },
241	{ },
242};
243
244static int __init wii_device_probe(void)
245{
246	if (!machine_is(wii))
247		return 0;
248
249	of_platform_bus_probe(NULL, wii_of_bus, NULL);
250	return 0;
251}
252device_initcall(wii_device_probe);
253
254