summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/radeon/radeon_atpx_handler.c
blob: ed5dfe58f29c0845e8eb8a478560b9a01fe17677 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
 * Copyright (c) 2010 Red Hat Inc.
 * Author : Dave Airlie <airlied@redhat.com>
 *
 * Licensed under GPLv2
 *
 * ATPX support for both Intel/ATI
 */
#include <linux/vga_switcheroo.h>
#include <linux/slab.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#include <linux/pci.h>

#define ATPX_VERSION 0
#define ATPX_GPU_PWR 2
#define ATPX_MUX_SELECT 3

#define ATPX_INTEGRATED 0
#define ATPX_DISCRETE 1

#define ATPX_MUX_IGD 0
#define ATPX_MUX_DISCRETE 1

static struct radeon_atpx_priv {
	bool atpx_detected;
	/* handle for device - and atpx */
	acpi_handle dhandle;
	acpi_handle atpx_handle;
	acpi_handle atrm_handle;
} radeon_atpx_priv;

/* retrieve the ROM in 4k blocks */
static int radeon_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
			    int offset, int len)
{
	acpi_status status;
	union acpi_object atrm_arg_elements[2], *obj;
	struct acpi_object_list atrm_arg;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};

	atrm_arg.count = 2;
	atrm_arg.pointer = &atrm_arg_elements[0];

	atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
	atrm_arg_elements[0].integer.value = offset;

	atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
	atrm_arg_elements[1].integer.value = len;

	status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
	if (ACPI_FAILURE(status)) {
		printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
		return -ENODEV;
	}

	obj = (union acpi_object *)buffer.pointer;
	memcpy(bios+offset, obj->buffer.pointer, len);
	kfree(buffer.pointer);
	return len;
}

bool radeon_atrm_supported(struct pci_dev *pdev)
{
	/* get the discrete ROM only via ATRM */
	if (!radeon_atpx_priv.atpx_detected)
		return false;

	if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
		return false;
	return true;
}


int radeon_atrm_get_bios_chunk(uint8_t *bios, int offset, int len)
{
	return radeon_atrm_call(radeon_atpx_priv.atrm_handle, bios, offset, len);
}

static int radeon_atpx_get_version(acpi_handle handle)
{
	acpi_status status;
	union acpi_object atpx_arg_elements[2], *obj;
	struct acpi_object_list atpx_arg;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

	atpx_arg.count = 2;
	atpx_arg.pointer = &atpx_arg_elements[0];

	atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
	atpx_arg_elements[0].integer.value = ATPX_VERSION;

	atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
	atpx_arg_elements[1].integer.value = ATPX_VERSION;

	status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
	if (ACPI_FAILURE(status)) {
		printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
		return -ENOSYS;
	}
	obj = (union acpi_object *)buffer.pointer;
	if (obj && (obj->type == ACPI_TYPE_BUFFER))
		printk(KERN_INFO "radeon atpx: version is %d\n", *((u8 *)(obj->buffer.pointer) + 2));
	kfree(buffer.pointer);
	return 0;
}

static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value)
{
	acpi_status status;
	union acpi_object atpx_arg_elements[2];
	struct acpi_object_list atpx_arg;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	uint8_t buf[4] = {0};

	if (!handle)
		return -EINVAL;

	atpx_arg.count = 2;
	atpx_arg.pointer = &atpx_arg_elements[0];

	atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
	atpx_arg_elements[0].integer.value = cmd_id;

	buf[2] = value & 0xff;
	buf[3] = (value >> 8) & 0xff;

	atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
	atpx_arg_elements[1].buffer.length = 4;
	atpx_arg_elements[1].buffer.pointer = buf;

	status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
	if (ACPI_FAILURE(status)) {
		printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
		return -ENOSYS;
	}
	kfree(buffer.pointer);

	return 0;
}

static int radeon_atpx_set_discrete_state(acpi_handle handle, int state)
{
	return radeon_atpx_execute(handle, ATPX_GPU_PWR, state);
}

static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id)
{
	return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id);
}


static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
{
	if (id == VGA_SWITCHEROO_IGD)
		radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, 0);
	else
		radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, 1);
	return 0;
}

static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
				   enum vga_switcheroo_state state)
{
	/* on w500 ACPI can't change intel gpu state */
	if (id == VGA_SWITCHEROO_IGD)
		return 0;

	radeon_atpx_set_discrete_state(radeon_atpx_priv.atpx_handle, state);
	return 0;
}

static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
{
	acpi_handle dhandle, atpx_handle, atrm_handle;
	acpi_status status;

	dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
	if (!dhandle)
		return false;

	status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
	if (ACPI_FAILURE(status))
		return false;

	status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
	if (ACPI_FAILURE(status))
		return false;

	radeon_atpx_priv.dhandle = dhandle;
	radeon_atpx_priv.atpx_handle = atpx_handle;
	radeon_atpx_priv.atrm_handle = atrm_handle;
	return true;
}

static int radeon_atpx_init(void)
{
	/* set up the ATPX handle */

	radeon_atpx_get_version(radeon_atpx_priv.atpx_handle);
	return 0;
}

static int radeon_atpx_get_client_id(struct pci_dev *pdev)
{
	if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
		return VGA_SWITCHEROO_IGD;
	else
		return VGA_SWITCHEROO_DIS;
}

static struct vga_switcheroo_handler radeon_atpx_handler = {
	.switchto = radeon_atpx_switchto,
	.power_state = radeon_atpx_power_state,
	.init = radeon_atpx_init,
	.get_client_id = radeon_atpx_get_client_id,
};

static bool radeon_atpx_detect(void)
{
	char acpi_method_name[255] = { 0 };
	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	struct pci_dev *pdev = NULL;
	bool has_atpx = false;
	int vga_count = 0;

	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
		vga_count++;

		has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
	}

	if (has_atpx && vga_count == 2) {
		acpi_get_name(radeon_atpx_priv.atpx_handle, ACPI_FULL_PATHNAME, &buffer);
		printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
		       acpi_method_name);
		radeon_atpx_priv.atpx_detected = true;
		return true;
	}
	return false;
}

void radeon_register_atpx_handler(void)
{
	bool r;

	/* detect if we have any ATPX + 2 VGA in the system */
	r = radeon_atpx_detect();
	if (!r)
		return;

	vga_switcheroo_register_handler(&radeon_atpx_handler);
}

void radeon_unregister_atpx_handler(void)
{
	vga_switcheroo_unregister_handler();
}