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Tony Priske9a91de2012-08-03 21:00:06 +12001/*
2 * arch/arm/mach-vt8500/vt8500.c
3 *
4 * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include <linux/io.h>
22#include <linux/pm.h>
23
24#include <asm/mach-types.h>
25#include <asm/mach/arch.h>
26#include <asm/mach/time.h>
27#include <asm/mach/map.h>
28
29#include <linux/of.h>
30#include <linux/of_address.h>
31#include <linux/of_irq.h>
32#include <linux/of_platform.h>
33
Tony Priske9a91de2012-08-03 21:00:06 +120034#include "common.h"
35
36#define LEGACY_GPIO_BASE 0xD8110000
37#define LEGACY_PMC_BASE 0xD8130000
38
39/* Registers in GPIO Controller */
40#define VT8500_GPIO_MUX_REG 0x200
41
42/* Registers in Power Management Controller */
43#define VT8500_HCR_REG 0x12
44#define VT8500_PMSR_REG 0x60
45
46static void __iomem *pmc_base;
47
48void vt8500_restart(char mode, const char *cmd)
49{
50 if (pmc_base)
51 writel(1, pmc_base + VT8500_PMSR_REG);
52}
53
54static struct map_desc vt8500_io_desc[] __initdata = {
55 /* SoC MMIO registers */
56 [0] = {
57 .virtual = 0xf8000000,
58 .pfn = __phys_to_pfn(0xd8000000),
59 .length = 0x00390000, /* max of all chip variants */
60 .type = MT_DEVICE
61 },
62};
63
64void __init vt8500_map_io(void)
65{
66 iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc));
67}
68
69static void vt8500_power_off(void)
70{
71 local_irq_disable();
72 writew(5, pmc_base + VT8500_HCR_REG);
73 asm("mcr%? p15, 0, %0, c7, c0, 4" : : "r" (0));
74}
75
76void __init vt8500_init(void)
77{
Tony Priska4ee7772012-10-07 14:02:14 +130078 struct device_node *np;
79#if defined(CONFIG_FB_VT8500) || defined(CONFIG_FB_WM8505)
80 struct device_node *fb;
Tony Priske9a91de2012-08-03 21:00:06 +120081 void __iomem *gpio_base;
Tony Priska4ee7772012-10-07 14:02:14 +130082#endif
Tony Priske9a91de2012-08-03 21:00:06 +120083
84#ifdef CONFIG_FB_VT8500
85 fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb");
86 if (fb) {
87 np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio");
88 if (np) {
89 gpio_base = of_iomap(np, 0);
90
91 if (!gpio_base)
92 pr_err("%s: of_iomap(gpio_mux) failed\n",
93 __func__);
94
95 of_node_put(np);
96 } else {
97 gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
98 if (!gpio_base)
99 pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
100 __func__);
101 }
102 if (gpio_base) {
103 writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 1,
104 gpio_base + VT8500_GPIO_MUX_REG);
105 iounmap(gpio_base);
106 } else
107 pr_err("%s: Could not remap GPIO mux\n", __func__);
108
109 of_node_put(fb);
110 }
111#endif
112
113#ifdef CONFIG_FB_WM8505
114 fb = of_find_compatible_node(NULL, NULL, "wm,wm8505-fb");
115 if (fb) {
116 np = of_find_compatible_node(NULL, NULL, "wm,wm8505-gpio");
117 if (!np)
118 np = of_find_compatible_node(NULL, NULL,
119 "wm,wm8650-gpio");
120 if (np) {
121 gpio_base = of_iomap(np, 0);
122
123 if (!gpio_base)
124 pr_err("%s: of_iomap(gpio_mux) failed\n",
125 __func__);
126
127 of_node_put(np);
128 } else {
129 gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
130 if (!gpio_base)
131 pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
132 __func__);
133 }
134 if (gpio_base) {
135 writel(readl(gpio_base + VT8500_GPIO_MUX_REG) |
136 0x80000000, gpio_base + VT8500_GPIO_MUX_REG);
137 iounmap(gpio_base);
138 } else
139 pr_err("%s: Could not remap GPIO mux\n", __func__);
140
141 of_node_put(fb);
142 }
143#endif
144
145 np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
146 if (np) {
147 pmc_base = of_iomap(np, 0);
148
149 if (!pmc_base)
150 pr_err("%s:of_iomap(pmc) failed\n", __func__);
151
152 of_node_put(np);
153 } else {
154 pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
155 if (!pmc_base)
156 pr_err("%s:ioremap(power_off) failed\n", __func__);
157 }
158 if (pmc_base)
159 pm_power_off = &vt8500_power_off;
160 else
161 pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n", __func__);
162
163 vtwm_clk_init(pmc_base);
164
165 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
166}
167
168static const struct of_device_id vt8500_irq_match[] __initconst = {
169 { .compatible = "via,vt8500-intc", .data = vt8500_irq_init, },
170 { /* sentinel */ },
171};
172
173static void __init vt8500_init_irq(void)
174{
175 of_irq_init(vt8500_irq_match);
176};
177
178static struct sys_timer vt8500_timer = {
179 .init = vt8500_timer_init,
180};
181
182static const char * const vt8500_dt_compat[] = {
183 "via,vt8500",
184 "wm,wm8650",
185 "wm,wm8505",
186};
187
188DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)")
189 .dt_compat = vt8500_dt_compat,
190 .map_io = vt8500_map_io,
191 .init_irq = vt8500_init_irq,
192 .timer = &vt8500_timer,
193 .init_machine = vt8500_init,
194 .restart = vt8500_restart,
Tony Prisk0c464d52012-10-10 20:59:32 +1300195 .handle_irq = vt8500_handle_irq,
Tony Priske9a91de2012-08-03 21:00:06 +1200196MACHINE_END
197