1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/io.h>
3 #include <linux/init.h>
4 #include <linux/ioport.h>
5 #include <linux/export.h>
6 #include <linux/of.h>
7 #include <linux/platform_device.h>
8
9 static unsigned long acpi_iobase;
10
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)
17
18 #define PM_INDEX 0xCD6
19 #define PM_DATA 0xCD7
20 #define PM2_INDEX 0xCD0
21 #define PM2_DATA 0xCD1
22
pmio_write_index(u16 index,u8 reg,u8 value)23 static void pmio_write_index(u16 index, u8 reg, u8 value)
24 {
25 outb(reg, index);
26 outb(value, index + 1);
27 }
28
pmio_read_index(u16 index,u8 reg)29 static u8 pmio_read_index(u16 index, u8 reg)
30 {
31 outb(reg, index);
32 return inb(index + 1);
33 }
34
pm_iowrite(u8 reg,u8 value)35 void pm_iowrite(u8 reg, u8 value)
36 {
37 pmio_write_index(PM_INDEX, reg, value);
38 }
39 EXPORT_SYMBOL(pm_iowrite);
40
pm_ioread(u8 reg)41 u8 pm_ioread(u8 reg)
42 {
43 return pmio_read_index(PM_INDEX, reg);
44 }
45 EXPORT_SYMBOL(pm_ioread);
46
pm2_iowrite(u8 reg,u8 value)47 void pm2_iowrite(u8 reg, u8 value)
48 {
49 pmio_write_index(PM2_INDEX, reg, value);
50 }
51 EXPORT_SYMBOL(pm2_iowrite);
52
pm2_ioread(u8 reg)53 u8 pm2_ioread(u8 reg)
54 {
55 return pmio_read_index(PM2_INDEX, reg);
56 }
57 EXPORT_SYMBOL(pm2_ioread);
58
acpi_hw_clear_status(void)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
acpi_registers_setup(void)72 static void acpi_registers_setup(void)
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
rs780e_acpi_probe(struct platform_device * pdev)135 static int rs780e_acpi_probe(struct platform_device *pdev)
136 {
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
151 acpi_registers_setup();
152 acpi_hw_clear_status();
153
154 return 0;
155 }
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);
170