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
9static 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
23static void pmio_write_index(u16 index, u8 reg, u8 value)
24{
25	outb(reg, index);
26	outb(value, index + 1);
27}
28
29static u8 pmio_read_index(u16 index, u8 reg)
30{
31	outb(reg, index);
32	return inb(index + 1);
33}
34
35void pm_iowrite(u8 reg, u8 value)
36{
37	pmio_write_index(PM_INDEX, reg, value);
38}
39EXPORT_SYMBOL(pm_iowrite);
40
41u8 pm_ioread(u8 reg)
42{
43	return pmio_read_index(PM_INDEX, reg);
44}
45EXPORT_SYMBOL(pm_ioread);
46
47void pm2_iowrite(u8 reg, u8 value)
48{
49	pmio_write_index(PM2_INDEX, reg, value);
50}
51EXPORT_SYMBOL(pm2_iowrite);
52
53u8 pm2_ioread(u8 reg)
54{
55	return pmio_read_index(PM2_INDEX, reg);
56}
57EXPORT_SYMBOL(pm2_ioread);
58
59static 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
72static 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
135static 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
157static const struct of_device_id rs780e_acpi_match[] = {
158	{ .compatible = "loongson,rs780e-acpi" },
159	{},
160};
161
162static 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};
169builtin_platform_driver(rs780e_acpi_driver);
170