1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * arch/arm/mach-vt8500/vt8500.c |
4 | * |
5 | * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz> |
6 | */ |
7 | |
8 | #include <linux/io.h> |
9 | #include <linux/pm.h> |
10 | #include <linux/reboot.h> |
11 | |
12 | #include <asm/mach-types.h> |
13 | #include <asm/mach/arch.h> |
14 | #include <asm/mach/time.h> |
15 | #include <asm/mach/map.h> |
16 | |
17 | #include <linux/of.h> |
18 | #include <linux/of_address.h> |
19 | #include <linux/of_irq.h> |
20 | |
21 | #define LEGACY_GPIO_BASE 0xD8110000 |
22 | #define LEGACY_PMC_BASE 0xD8130000 |
23 | |
24 | /* Registers in GPIO Controller */ |
25 | #define VT8500_GPIO_MUX_REG 0x200 |
26 | |
27 | /* Registers in Power Management Controller */ |
28 | #define VT8500_HCR_REG 0x12 |
29 | #define VT8500_PMSR_REG 0x60 |
30 | |
31 | static void __iomem *pmc_base; |
32 | |
33 | static void vt8500_restart(enum reboot_mode mode, const char *cmd) |
34 | { |
35 | if (pmc_base) |
36 | writel(val: 1, addr: pmc_base + VT8500_PMSR_REG); |
37 | } |
38 | |
39 | static struct map_desc vt8500_io_desc[] __initdata = { |
40 | /* SoC MMIO registers */ |
41 | [0] = { |
42 | .virtual = 0xf8000000, |
43 | .pfn = __phys_to_pfn(0xd8000000), |
44 | .length = 0x00390000, /* max of all chip variants */ |
45 | .type = MT_DEVICE |
46 | }, |
47 | }; |
48 | |
49 | static void __init vt8500_map_io(void) |
50 | { |
51 | iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc)); |
52 | } |
53 | |
54 | static void vt8500_power_off(void) |
55 | { |
56 | local_irq_disable(); |
57 | writew(val: 5, addr: pmc_base + VT8500_HCR_REG); |
58 | asm("mcr p15, 0, %0, c7, c0, 4" : : "r" (0)); |
59 | } |
60 | |
61 | static void __init vt8500_init(void) |
62 | { |
63 | struct device_node *np; |
64 | #if defined(CONFIG_FB_VT8500) || defined(CONFIG_FB_WM8505) |
65 | struct device_node *fb; |
66 | void __iomem *gpio_base; |
67 | #endif |
68 | |
69 | #ifdef CONFIG_FB_VT8500 |
70 | fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb" ); |
71 | if (fb) { |
72 | np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio" ); |
73 | if (np) { |
74 | gpio_base = of_iomap(np, 0); |
75 | |
76 | if (!gpio_base) |
77 | pr_err("%s: of_iomap(gpio_mux) failed\n" , |
78 | __func__); |
79 | |
80 | of_node_put(np); |
81 | } else { |
82 | gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000); |
83 | if (!gpio_base) |
84 | pr_err("%s: ioremap(legacy_gpio_mux) failed\n" , |
85 | __func__); |
86 | } |
87 | if (gpio_base) { |
88 | writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 1, |
89 | gpio_base + VT8500_GPIO_MUX_REG); |
90 | iounmap(gpio_base); |
91 | } else |
92 | pr_err("%s: Could not remap GPIO mux\n" , __func__); |
93 | |
94 | of_node_put(fb); |
95 | } |
96 | #endif |
97 | |
98 | #ifdef CONFIG_FB_WM8505 |
99 | fb = of_find_compatible_node(NULL, NULL, compat: "wm,wm8505-fb" ); |
100 | if (fb) { |
101 | np = of_find_compatible_node(NULL, NULL, compat: "wm,wm8505-gpio" ); |
102 | if (!np) |
103 | np = of_find_compatible_node(NULL, NULL, |
104 | compat: "wm,wm8650-gpio" ); |
105 | if (np) { |
106 | gpio_base = of_iomap(node: np, index: 0); |
107 | |
108 | if (!gpio_base) |
109 | pr_err("%s: of_iomap(gpio_mux) failed\n" , |
110 | __func__); |
111 | |
112 | of_node_put(node: np); |
113 | } else { |
114 | gpio_base = ioremap(LEGACY_GPIO_BASE, size: 0x1000); |
115 | if (!gpio_base) |
116 | pr_err("%s: ioremap(legacy_gpio_mux) failed\n" , |
117 | __func__); |
118 | } |
119 | if (gpio_base) { |
120 | writel(readl(addr: gpio_base + VT8500_GPIO_MUX_REG) | |
121 | 0x80000000, addr: gpio_base + VT8500_GPIO_MUX_REG); |
122 | iounmap(addr: gpio_base); |
123 | } else |
124 | pr_err("%s: Could not remap GPIO mux\n" , __func__); |
125 | |
126 | of_node_put(node: fb); |
127 | } |
128 | #endif |
129 | |
130 | np = of_find_compatible_node(NULL, NULL, compat: "via,vt8500-pmc" ); |
131 | if (np) { |
132 | pmc_base = of_iomap(node: np, index: 0); |
133 | |
134 | if (!pmc_base) |
135 | pr_err("%s:of_iomap(pmc) failed\n" , __func__); |
136 | |
137 | of_node_put(node: np); |
138 | } else { |
139 | pmc_base = ioremap(LEGACY_PMC_BASE, size: 0x1000); |
140 | if (!pmc_base) |
141 | pr_err("%s:ioremap(power_off) failed\n" , __func__); |
142 | } |
143 | if (pmc_base) |
144 | pm_power_off = &vt8500_power_off; |
145 | else |
146 | pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n" , __func__); |
147 | } |
148 | |
149 | static const char * const vt8500_dt_compat[] = { |
150 | "via,vt8500" , |
151 | "wm,wm8650" , |
152 | "wm,wm8505" , |
153 | "wm,wm8750" , |
154 | "wm,wm8850" , |
155 | NULL |
156 | }; |
157 | |
158 | DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)" ) |
159 | .dt_compat = vt8500_dt_compat, |
160 | .map_io = vt8500_map_io, |
161 | .init_machine = vt8500_init, |
162 | .restart = vt8500_restart, |
163 | MACHINE_END |
164 | |
165 | |