1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * arch/powerpc/platforms/embedded6xx/wii.c
4 *
5 * Nintendo Wii board-specific support
6 * Copyright (C) 2008-2009 The GameCube Linux Team
7 * Copyright (C) 2008,2009 Albert Herranz
8 */
9#define DRV_MODULE_NAME "wii"
10#define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
11
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/irq.h>
15#include <linux/seq_file.h>
16#include <linux/of_address.h>
17#include <linux/of_platform.h>
18
19#include <asm/io.h>
20#include <asm/machdep.h>
21#include <asm/time.h>
22#include <asm/udbg.h>
23
24#include "flipper-pic.h"
25#include "hlwd-pic.h"
26#include "usbgecko_udbg.h"
27
28/* control block */
29#define HW_CTRL_COMPATIBLE	"nintendo,hollywood-control"
30
31#define HW_CTRL_RESETS		0x94
32#define HW_CTRL_RESETS_SYS	(1<<0)
33
34/* gpio */
35#define HW_GPIO_COMPATIBLE	"nintendo,hollywood-gpio"
36
37#define HW_GPIO_BASE(idx)	(idx * 0x20)
38#define HW_GPIO_OUT(idx)	(HW_GPIO_BASE(idx) + 0)
39#define HW_GPIO_DIR(idx)	(HW_GPIO_BASE(idx) + 4)
40#define HW_GPIO_OWNER		(HW_GPIO_BASE(1) + 0x1c)
41
42#define HW_GPIO_SHUTDOWN	(1<<1)
43#define HW_GPIO_SLOT_LED	(1<<5)
44#define HW_GPIO_SENSOR_BAR	(1<<8)
45
46
47static void __iomem *hw_ctrl;
48static void __iomem *hw_gpio;
49
50static void __noreturn wii_spin(void)
51{
52	local_irq_disable();
53	for (;;)
54		cpu_relax();
55}
56
57static void __iomem *__init wii_ioremap_hw_regs(char *name, char *compatible)
58{
59	void __iomem *hw_regs = NULL;
60	struct device_node *np;
61	struct resource res;
62	int error = -ENODEV;
63
64	np = of_find_compatible_node(NULL, NULL, compatible);
65	if (!np) {
66		pr_err("no compatible node found for %s\n", compatible);
67		goto out;
68	}
69	error = of_address_to_resource(np, 0, &res);
70	if (error) {
71		pr_err("no valid reg found for %pOFn\n", np);
72		goto out_put;
73	}
74
75	hw_regs = ioremap(res.start, resource_size(&res));
76	if (hw_regs) {
77		pr_info("%s at 0x%pa mapped to 0x%p\n", name,
78			&res.start, hw_regs);
79	}
80
81out_put:
82	of_node_put(np);
83out:
84	return hw_regs;
85}
86
87static void __init wii_setup_arch(void)
88{
89	hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE);
90	hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE);
91	if (hw_gpio) {
92		/* turn off the front blue led and IR light */
93		clrbits32(hw_gpio + HW_GPIO_OUT(0),
94			  HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR);
95	}
96}
97
98static void __noreturn wii_restart(char *cmd)
99{
100	local_irq_disable();
101
102	if (hw_ctrl) {
103		/* clear the system reset pin to cause a reset */
104		clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS);
105	}
106	wii_spin();
107}
108
109static void wii_power_off(void)
110{
111	local_irq_disable();
112
113	if (hw_gpio) {
114		/*
115		 * set the owner of the shutdown pin to ARM, because it is
116		 * accessed through the registers for the ARM, below
117		 */
118		clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN);
119
120		/* make sure that the poweroff GPIO is configured as output */
121		setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN);
122
123		/* drive the poweroff GPIO high */
124		setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN);
125	}
126	wii_spin();
127}
128
129static void __noreturn wii_halt(void)
130{
131	if (ppc_md.restart)
132		ppc_md.restart(NULL);
133	wii_spin();
134}
135
136static void __init wii_pic_probe(void)
137{
138	flipper_pic_probe();
139	hlwd_pic_probe();
140}
141
142static int __init wii_probe(void)
143{
144	pm_power_off = wii_power_off;
145
146	ug_udbg_init();
147
148	return 1;
149}
150
151static void wii_shutdown(void)
152{
153	hlwd_quiesce();
154	flipper_quiesce();
155}
156
157static const struct of_device_id wii_of_bus[] = {
158	{ .compatible = "nintendo,hollywood", },
159	{ },
160};
161
162static int __init wii_device_probe(void)
163{
164	of_platform_populate(NULL, wii_of_bus, NULL, NULL);
165	return 0;
166}
167machine_device_initcall(wii, wii_device_probe);
168
169define_machine(wii) {
170	.name			= "wii",
171	.compatible		= "nintendo,wii",
172	.probe			= wii_probe,
173	.setup_arch		= wii_setup_arch,
174	.restart		= wii_restart,
175	.halt			= wii_halt,
176	.init_IRQ		= wii_pic_probe,
177	.get_irq		= flipper_pic_get_irq,
178	.progress		= udbg_progress,
179	.machine_shutdown	= wii_shutdown,
180};
181