Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
9c057b3e HC |
2 | #include <linux/io.h> |
3 | #include <linux/init.h> | |
4 | #include <linux/ioport.h> | |
5 | #include <linux/export.h> | |
0cfd2440 JY |
6 | #include <linux/of.h> |
7 | #include <linux/platform_device.h> | |
9c057b3e | 8 | |
0cfd2440 | 9 | static unsigned long acpi_iobase; |
9c057b3e | 10 | |
0cfd2440 JY |
11 | #define ACPI_PM_EVT_BLK (acpi_iobase + 0x00) /* 4 bytes */ |
12 | #define ACPI_PM_CNT_BLK (acpi_iobase + 0x04) /* 2 bytes */ | |
13 | #define ACPI_PMA_CNT_BLK (acpi_iobase + 0x0F) /* 1 byte */ | |
14 | #define ACPI_PM_TMR_BLK (acpi_iobase + 0x18) /* 4 bytes */ | |
15 | #define ACPI_GPE0_BLK (acpi_iobase + 0x10) /* 8 bytes */ | |
16 | #define ACPI_END (acpi_iobase + 0x80) | |
9c057b3e HC |
17 | |
18 | #define PM_INDEX 0xCD6 | |
19 | #define PM_DATA 0xCD7 | |
20 | #define PM2_INDEX 0xCD0 | |
21 | #define PM2_DATA 0xCD1 | |
22 | ||
9c057b3e HC |
23 | static void pmio_write_index(u16 index, u8 reg, u8 value) |
24 | { | |
25 | outb(reg, index); | |
26 | outb(value, index + 1); | |
27 | } | |
28 | ||
29 | static u8 pmio_read_index(u16 index, u8 reg) | |
30 | { | |
31 | outb(reg, index); | |
32 | return inb(index + 1); | |
33 | } | |
34 | ||
35 | void pm_iowrite(u8 reg, u8 value) | |
36 | { | |
37 | pmio_write_index(PM_INDEX, reg, value); | |
38 | } | |
39 | EXPORT_SYMBOL(pm_iowrite); | |
40 | ||
41 | u8 pm_ioread(u8 reg) | |
42 | { | |
43 | return pmio_read_index(PM_INDEX, reg); | |
44 | } | |
45 | EXPORT_SYMBOL(pm_ioread); | |
46 | ||
47 | void pm2_iowrite(u8 reg, u8 value) | |
48 | { | |
49 | pmio_write_index(PM2_INDEX, reg, value); | |
50 | } | |
51 | EXPORT_SYMBOL(pm2_iowrite); | |
52 | ||
53 | u8 pm2_ioread(u8 reg) | |
54 | { | |
55 | return pmio_read_index(PM2_INDEX, reg); | |
56 | } | |
57 | EXPORT_SYMBOL(pm2_ioread); | |
58 | ||
59 | static void acpi_hw_clear_status(void) | |
60 | { | |
61 | u16 value; | |
62 | ||
63 | /* PMStatus: Clear WakeStatus/PwrBtnStatus */ | |
64 | value = inw(ACPI_PM_EVT_BLK); | |
65 | value |= (1 << 8 | 1 << 15); | |
66 | outw(value, ACPI_PM_EVT_BLK); | |
67 | ||
68 | /* GPEStatus: Clear all generated events */ | |
69 | outl(inl(ACPI_GPE0_BLK), ACPI_GPE0_BLK); | |
70 | } | |
71 | ||
52001066 | 72 | static void acpi_registers_setup(void) |
9c057b3e HC |
73 | { |
74 | u32 value; | |
75 | ||
76 | /* PM Status Base */ | |
77 | pm_iowrite(0x20, ACPI_PM_EVT_BLK & 0xff); | |
78 | pm_iowrite(0x21, ACPI_PM_EVT_BLK >> 8); | |
79 | ||
80 | /* PM Control Base */ | |
81 | pm_iowrite(0x22, ACPI_PM_CNT_BLK & 0xff); | |
82 | pm_iowrite(0x23, ACPI_PM_CNT_BLK >> 8); | |
83 | ||
84 | /* GPM Base */ | |
85 | pm_iowrite(0x28, ACPI_GPE0_BLK & 0xff); | |
86 | pm_iowrite(0x29, ACPI_GPE0_BLK >> 8); | |
87 | ||
88 | /* ACPI End */ | |
89 | pm_iowrite(0x2e, ACPI_END & 0xff); | |
90 | pm_iowrite(0x2f, ACPI_END >> 8); | |
91 | ||
92 | /* IO Decode: When AcpiDecodeEnable set, South-Bridge uses the contents | |
93 | * of the PM registers at index 0x20~0x2B to decode ACPI I/O address. */ | |
94 | pm_iowrite(0x0e, 1 << 3); | |
95 | ||
96 | /* SCI_EN set */ | |
97 | outw(1, ACPI_PM_CNT_BLK); | |
98 | ||
99 | /* Enable to generate SCI */ | |
100 | pm_iowrite(0x10, pm_ioread(0x10) | 1); | |
101 | ||
102 | /* GPM3/GPM9 enable */ | |
103 | value = inl(ACPI_GPE0_BLK + 4); | |
104 | outl(value | (1 << 14) | (1 << 22), ACPI_GPE0_BLK + 4); | |
105 | ||
106 | /* Set GPM9 as input */ | |
107 | pm_iowrite(0x8d, pm_ioread(0x8d) & (~(1 << 1))); | |
108 | ||
109 | /* Set GPM9 as non-output */ | |
110 | pm_iowrite(0x94, pm_ioread(0x94) | (1 << 3)); | |
111 | ||
112 | /* GPM3 config ACPI trigger SCIOUT */ | |
113 | pm_iowrite(0x33, pm_ioread(0x33) & (~(3 << 4))); | |
114 | ||
115 | /* GPM9 config ACPI trigger SCIOUT */ | |
116 | pm_iowrite(0x3d, pm_ioread(0x3d) & (~(3 << 2))); | |
117 | ||
118 | /* GPM3 config falling edge trigger */ | |
119 | pm_iowrite(0x37, pm_ioread(0x37) & (~(1 << 6))); | |
120 | ||
121 | /* No wait for STPGNT# in ACPI Sx state */ | |
122 | pm_iowrite(0x7c, pm_ioread(0x7c) | (1 << 6)); | |
123 | ||
124 | /* Set GPM3 pull-down enable */ | |
125 | value = pm2_ioread(0xf6); | |
126 | value |= ((1 << 7) | (1 << 3)); | |
127 | pm2_iowrite(0xf6, value); | |
128 | ||
129 | /* Set GPM9 pull-down enable */ | |
130 | value = pm2_ioread(0xf8); | |
131 | value |= ((1 << 5) | (1 << 1)); | |
132 | pm2_iowrite(0xf8, value); | |
133 | } | |
134 | ||
0cfd2440 | 135 | static int rs780e_acpi_probe(struct platform_device *pdev) |
9c057b3e | 136 | { |
0cfd2440 JY |
137 | struct resource *res; |
138 | ||
139 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
140 | if (!res) | |
141 | return -ENODEV; | |
142 | ||
143 | /* SCI interrupt need acpi space, allocate here */ | |
144 | if (!request_region(res->start, resource_size(res), "acpi")) { | |
145 | pr_err("RS780E-ACPI: Failed to request IO Region\n"); | |
146 | return -EBUSY; | |
147 | } | |
148 | ||
149 | acpi_iobase = res->start; | |
150 | ||
9c057b3e HC |
151 | acpi_registers_setup(); |
152 | acpi_hw_clear_status(); | |
153 | ||
154 | return 0; | |
155 | } | |
0cfd2440 JY |
156 | |
157 | static const struct of_device_id rs780e_acpi_match[] = { | |
158 | { .compatible = "loongson,rs780e-acpi" }, | |
159 | {}, | |
160 | }; | |
161 | ||
162 | static struct platform_driver rs780e_acpi_driver = { | |
163 | .probe = rs780e_acpi_probe, | |
164 | .driver = { | |
165 | .name = "RS780E-ACPI", | |
166 | .of_match_table = rs780e_acpi_match, | |
167 | }, | |
168 | }; | |
169 | builtin_platform_driver(rs780e_acpi_driver); |