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
7 #define SBX00_ACPI_IO_BASE 0x800
8 #define SBX00_ACPI_IO_SIZE 0x100
9
10 #define ACPI_PM_EVT_BLK (SBX00_ACPI_IO_BASE + 0x00) /* 4 bytes */
11 #define ACPI_PM_CNT_BLK (SBX00_ACPI_IO_BASE + 0x04) /* 2 bytes */
12 #define ACPI_PMA_CNT_BLK (SBX00_ACPI_IO_BASE + 0x0F) /* 1 byte */
13 #define ACPI_PM_TMR_BLK (SBX00_ACPI_IO_BASE + 0x18) /* 4 bytes */
14 #define ACPI_GPE0_BLK (SBX00_ACPI_IO_BASE + 0x10) /* 8 bytes */
15 #define ACPI_END (SBX00_ACPI_IO_BASE + 0x80)
16
17 #define PM_INDEX 0xCD6
18 #define PM_DATA 0xCD7
19 #define PM2_INDEX 0xCD0
20 #define PM2_DATA 0xCD1
21
22 /*
23 * SCI interrupt need acpi space, allocate here
24 */
25
register_acpi_resource(void)26 static int __init register_acpi_resource(void)
27 {
28 request_region(SBX00_ACPI_IO_BASE, SBX00_ACPI_IO_SIZE, "acpi");
29 return 0;
30 }
31
pmio_write_index(u16 index,u8 reg,u8 value)32 static void pmio_write_index(u16 index, u8 reg, u8 value)
33 {
34 outb(reg, index);
35 outb(value, index + 1);
36 }
37
pmio_read_index(u16 index,u8 reg)38 static u8 pmio_read_index(u16 index, u8 reg)
39 {
40 outb(reg, index);
41 return inb(index + 1);
42 }
43
pm_iowrite(u8 reg,u8 value)44 void pm_iowrite(u8 reg, u8 value)
45 {
46 pmio_write_index(PM_INDEX, reg, value);
47 }
48 EXPORT_SYMBOL(pm_iowrite);
49
pm_ioread(u8 reg)50 u8 pm_ioread(u8 reg)
51 {
52 return pmio_read_index(PM_INDEX, reg);
53 }
54 EXPORT_SYMBOL(pm_ioread);
55
pm2_iowrite(u8 reg,u8 value)56 void pm2_iowrite(u8 reg, u8 value)
57 {
58 pmio_write_index(PM2_INDEX, reg, value);
59 }
60 EXPORT_SYMBOL(pm2_iowrite);
61
pm2_ioread(u8 reg)62 u8 pm2_ioread(u8 reg)
63 {
64 return pmio_read_index(PM2_INDEX, reg);
65 }
66 EXPORT_SYMBOL(pm2_ioread);
67
acpi_hw_clear_status(void)68 static void acpi_hw_clear_status(void)
69 {
70 u16 value;
71
72 /* PMStatus: Clear WakeStatus/PwrBtnStatus */
73 value = inw(ACPI_PM_EVT_BLK);
74 value |= (1 << 8 | 1 << 15);
75 outw(value, ACPI_PM_EVT_BLK);
76
77 /* GPEStatus: Clear all generated events */
78 outl(inl(ACPI_GPE0_BLK), ACPI_GPE0_BLK);
79 }
80
acpi_registers_setup(void)81 void acpi_registers_setup(void)
82 {
83 u32 value;
84
85 /* PM Status Base */
86 pm_iowrite(0x20, ACPI_PM_EVT_BLK & 0xff);
87 pm_iowrite(0x21, ACPI_PM_EVT_BLK >> 8);
88
89 /* PM Control Base */
90 pm_iowrite(0x22, ACPI_PM_CNT_BLK & 0xff);
91 pm_iowrite(0x23, ACPI_PM_CNT_BLK >> 8);
92
93 /* GPM Base */
94 pm_iowrite(0x28, ACPI_GPE0_BLK & 0xff);
95 pm_iowrite(0x29, ACPI_GPE0_BLK >> 8);
96
97 /* ACPI End */
98 pm_iowrite(0x2e, ACPI_END & 0xff);
99 pm_iowrite(0x2f, ACPI_END >> 8);
100
101 /* IO Decode: When AcpiDecodeEnable set, South-Bridge uses the contents
102 * of the PM registers at index 0x20~0x2B to decode ACPI I/O address. */
103 pm_iowrite(0x0e, 1 << 3);
104
105 /* SCI_EN set */
106 outw(1, ACPI_PM_CNT_BLK);
107
108 /* Enable to generate SCI */
109 pm_iowrite(0x10, pm_ioread(0x10) | 1);
110
111 /* GPM3/GPM9 enable */
112 value = inl(ACPI_GPE0_BLK + 4);
113 outl(value | (1 << 14) | (1 << 22), ACPI_GPE0_BLK + 4);
114
115 /* Set GPM9 as input */
116 pm_iowrite(0x8d, pm_ioread(0x8d) & (~(1 << 1)));
117
118 /* Set GPM9 as non-output */
119 pm_iowrite(0x94, pm_ioread(0x94) | (1 << 3));
120
121 /* GPM3 config ACPI trigger SCIOUT */
122 pm_iowrite(0x33, pm_ioread(0x33) & (~(3 << 4)));
123
124 /* GPM9 config ACPI trigger SCIOUT */
125 pm_iowrite(0x3d, pm_ioread(0x3d) & (~(3 << 2)));
126
127 /* GPM3 config falling edge trigger */
128 pm_iowrite(0x37, pm_ioread(0x37) & (~(1 << 6)));
129
130 /* No wait for STPGNT# in ACPI Sx state */
131 pm_iowrite(0x7c, pm_ioread(0x7c) | (1 << 6));
132
133 /* Set GPM3 pull-down enable */
134 value = pm2_ioread(0xf6);
135 value |= ((1 << 7) | (1 << 3));
136 pm2_iowrite(0xf6, value);
137
138 /* Set GPM9 pull-down enable */
139 value = pm2_ioread(0xf8);
140 value |= ((1 << 5) | (1 << 1));
141 pm2_iowrite(0xf8, value);
142 }
143
sbx00_acpi_init(void)144 int __init sbx00_acpi_init(void)
145 {
146 register_acpi_resource();
147 acpi_registers_setup();
148 acpi_hw_clear_status();
149
150 return 0;
151 }
152