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1/*
2 * Copyright (c) 2010 Red Hat Inc.
3 * Author : Dave Airlie <airlied@redhat.com>
4 *
5 * Licensed under GPLv2
6 *
7 * ATPX support for both Intel/ATI
8 */
9#include <linux/vga_switcheroo.h>
10#include <linux/slab.h>
11#include <acpi/acpi.h>
12#include <acpi/acpi_bus.h>
13#include <linux/pci.h>
14
15#define ATPX_VERSION 0
16#define ATPX_GPU_PWR 2
17#define ATPX_MUX_SELECT 3
18#define ATPX_I2C_MUX_SELECT 4
19#define ATPX_SWITCH_START 5
20#define ATPX_SWITCH_END 6
21
22#define ATPX_INTEGRATED 0
23#define ATPX_DISCRETE 1
24
25#define ATPX_MUX_IGD 0
26#define ATPX_MUX_DISCRETE 1
27
28static struct radeon_atpx_priv {
29 bool atpx_detected;
30 /* handle for device - and atpx */
31 acpi_handle dhandle;
32 acpi_handle atpx_handle;
33 acpi_handle atrm_handle;
34} radeon_atpx_priv;
35
36/* retrieve the ROM in 4k blocks */
37static int radeon_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
38 int offset, int len)
39{
40 acpi_status status;
41 union acpi_object atrm_arg_elements[2], *obj;
42 struct acpi_object_list atrm_arg;
43 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
44
45 atrm_arg.count = 2;
46 atrm_arg.pointer = &atrm_arg_elements[0];
47
48 atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
49 atrm_arg_elements[0].integer.value = offset;
50
51 atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
52 atrm_arg_elements[1].integer.value = len;
53
54 status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
55 if (ACPI_FAILURE(status)) {
56 printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
57 return -ENODEV;
58 }
59
60 obj = (union acpi_object *)buffer.pointer;
61 memcpy(bios+offset, obj->buffer.pointer, len);
62 kfree(buffer.pointer);
63 return len;
64}
65
66bool radeon_atrm_supported(struct pci_dev *pdev)
67{
68 /* get the discrete ROM only via ATRM */
69 if (!radeon_atpx_priv.atpx_detected)
70 return false;
71
72 if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
73 return false;
74 return true;
75}
76
77
78int radeon_atrm_get_bios_chunk(uint8_t *bios, int offset, int len)
79{
80 return radeon_atrm_call(radeon_atpx_priv.atrm_handle, bios, offset, len);
81}
82
83static int radeon_atpx_get_version(acpi_handle handle)
84{
85 acpi_status status;
86 union acpi_object atpx_arg_elements[2], *obj;
87 struct acpi_object_list atpx_arg;
88 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
89
90 atpx_arg.count = 2;
91 atpx_arg.pointer = &atpx_arg_elements[0];
92
93 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
94 atpx_arg_elements[0].integer.value = ATPX_VERSION;
95
96 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
97 atpx_arg_elements[1].integer.value = ATPX_VERSION;
98
99 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
100 if (ACPI_FAILURE(status)) {
101 printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
102 return -ENOSYS;
103 }
104 obj = (union acpi_object *)buffer.pointer;
105 if (obj && (obj->type == ACPI_TYPE_BUFFER))
106 printk(KERN_INFO "radeon atpx: version is %d\n", *((u8 *)(obj->buffer.pointer) + 2));
107 kfree(buffer.pointer);
108 return 0;
109}
110
111static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value)
112{
113 acpi_status status;
114 union acpi_object atpx_arg_elements[2];
115 struct acpi_object_list atpx_arg;
116 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
117 uint8_t buf[4] = {0};
118
119 if (!handle)
120 return -EINVAL;
121
122 atpx_arg.count = 2;
123 atpx_arg.pointer = &atpx_arg_elements[0];
124
125 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
126 atpx_arg_elements[0].integer.value = cmd_id;
127
128 buf[2] = value & 0xff;
129 buf[3] = (value >> 8) & 0xff;
130
131 atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
132 atpx_arg_elements[1].buffer.length = 4;
133 atpx_arg_elements[1].buffer.pointer = buf;
134
135 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
136 if (ACPI_FAILURE(status)) {
137 printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
138 return -ENOSYS;
139 }
140 kfree(buffer.pointer);
141
142 return 0;
143}
144
145static int radeon_atpx_set_discrete_state(acpi_handle handle, int state)
146{
147 return radeon_atpx_execute(handle, ATPX_GPU_PWR, state);
148}
149
150static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id)
151{
152 return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id);
153}
154
155static int radeon_atpx_switch_i2c_mux(acpi_handle handle, int mux_id)
156{
157 return radeon_atpx_execute(handle, ATPX_I2C_MUX_SELECT, mux_id);
158}
159
160static int radeon_atpx_switch_start(acpi_handle handle, int gpu_id)
161{
162 return radeon_atpx_execute(handle, ATPX_SWITCH_START, gpu_id);
163}
164
165static int radeon_atpx_switch_end(acpi_handle handle, int gpu_id)
166{
167 return radeon_atpx_execute(handle, ATPX_SWITCH_END, gpu_id);
168}
169
170static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
171{
172 int gpu_id;
173
174 if (id == VGA_SWITCHEROO_IGD)
175 gpu_id = ATPX_INTEGRATED;
176 else
177 gpu_id = ATPX_DISCRETE;
178
179 radeon_atpx_switch_start(radeon_atpx_priv.atpx_handle, gpu_id);
180 radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, gpu_id);
181 radeon_atpx_switch_i2c_mux(radeon_atpx_priv.atpx_handle, gpu_id);
182 radeon_atpx_switch_end(radeon_atpx_priv.atpx_handle, gpu_id);
183
184 return 0;
185}
186
187static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
188 enum vga_switcheroo_state state)
189{
190 /* on w500 ACPI can't change intel gpu state */
191 if (id == VGA_SWITCHEROO_IGD)
192 return 0;
193
194 radeon_atpx_set_discrete_state(radeon_atpx_priv.atpx_handle, state);
195 return 0;
196}
197
198static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
199{
200 acpi_handle dhandle, atpx_handle, atrm_handle;
201 acpi_status status;
202
203 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
204 if (!dhandle)
205 return false;
206
207 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
208 if (ACPI_FAILURE(status))
209 return false;
210
211 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
212 if (ACPI_FAILURE(status))
213 return false;
214
215 radeon_atpx_priv.dhandle = dhandle;
216 radeon_atpx_priv.atpx_handle = atpx_handle;
217 radeon_atpx_priv.atrm_handle = atrm_handle;
218 return true;
219}
220
221static int radeon_atpx_init(void)
222{
223 /* set up the ATPX handle */
224
225 radeon_atpx_get_version(radeon_atpx_priv.atpx_handle);
226 return 0;
227}
228
229static int radeon_atpx_get_client_id(struct pci_dev *pdev)
230{
231 if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
232 return VGA_SWITCHEROO_IGD;
233 else
234 return VGA_SWITCHEROO_DIS;
235}
236
237static struct vga_switcheroo_handler radeon_atpx_handler = {
238 .switchto = radeon_atpx_switchto,
239 .power_state = radeon_atpx_power_state,
240 .init = radeon_atpx_init,
241 .get_client_id = radeon_atpx_get_client_id,
242};
243
244static bool radeon_atpx_detect(void)
245{
246 char acpi_method_name[255] = { 0 };
247 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
248 struct pci_dev *pdev = NULL;
249 bool has_atpx = false;
250 int vga_count = 0;
251
252 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
253 vga_count++;
254
255 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
256 }
257
258 if (has_atpx && vga_count == 2) {
259 acpi_get_name(radeon_atpx_priv.atpx_handle, ACPI_FULL_PATHNAME, &buffer);
260 printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
261 acpi_method_name);
262 radeon_atpx_priv.atpx_detected = true;
263 return true;
264 }
265 return false;
266}
267
268void radeon_register_atpx_handler(void)
269{
270 bool r;
271
272 /* detect if we have any ATPX + 2 VGA in the system */
273 r = radeon_atpx_detect();
274 if (!r)
275 return;
276
277 vga_switcheroo_register_handler(&radeon_atpx_handler);
278}
279
280void radeon_unregister_atpx_handler(void)
281{
282 vga_switcheroo_unregister_handler();
283}
1/*
2 * Copyright (c) 2010 Red Hat Inc.
3 * Author : Dave Airlie <airlied@redhat.com>
4 *
5 * Licensed under GPLv2
6 *
7 * ATPX support for both Intel/ATI
8 */
9#include <linux/vga_switcheroo.h>
10#include <linux/slab.h>
11#include <acpi/acpi.h>
12#include <acpi/acpi_bus.h>
13#include <linux/pci.h>
14
15#define ATPX_VERSION 0
16#define ATPX_GPU_PWR 2
17#define ATPX_MUX_SELECT 3
18#define ATPX_I2C_MUX_SELECT 4
19#define ATPX_SWITCH_START 5
20#define ATPX_SWITCH_END 6
21
22#define ATPX_INTEGRATED 0
23#define ATPX_DISCRETE 1
24
25#define ATPX_MUX_IGD 0
26#define ATPX_MUX_DISCRETE 1
27
28static struct radeon_atpx_priv {
29 bool atpx_detected;
30 /* handle for device - and atpx */
31 acpi_handle dhandle;
32 acpi_handle atpx_handle;
33} radeon_atpx_priv;
34
35static int radeon_atpx_get_version(acpi_handle handle)
36{
37 acpi_status status;
38 union acpi_object atpx_arg_elements[2], *obj;
39 struct acpi_object_list atpx_arg;
40 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
41
42 atpx_arg.count = 2;
43 atpx_arg.pointer = &atpx_arg_elements[0];
44
45 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
46 atpx_arg_elements[0].integer.value = ATPX_VERSION;
47
48 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
49 atpx_arg_elements[1].integer.value = ATPX_VERSION;
50
51 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
52 if (ACPI_FAILURE(status)) {
53 printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
54 return -ENOSYS;
55 }
56 obj = (union acpi_object *)buffer.pointer;
57 if (obj && (obj->type == ACPI_TYPE_BUFFER))
58 printk(KERN_INFO "radeon atpx: version is %d\n", *((u8 *)(obj->buffer.pointer) + 2));
59 kfree(buffer.pointer);
60 return 0;
61}
62
63static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value)
64{
65 acpi_status status;
66 union acpi_object atpx_arg_elements[2];
67 struct acpi_object_list atpx_arg;
68 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
69 uint8_t buf[4] = {0};
70
71 if (!handle)
72 return -EINVAL;
73
74 atpx_arg.count = 2;
75 atpx_arg.pointer = &atpx_arg_elements[0];
76
77 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
78 atpx_arg_elements[0].integer.value = cmd_id;
79
80 buf[2] = value & 0xff;
81 buf[3] = (value >> 8) & 0xff;
82
83 atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
84 atpx_arg_elements[1].buffer.length = 4;
85 atpx_arg_elements[1].buffer.pointer = buf;
86
87 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
88 if (ACPI_FAILURE(status)) {
89 printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
90 return -ENOSYS;
91 }
92 kfree(buffer.pointer);
93
94 return 0;
95}
96
97static int radeon_atpx_set_discrete_state(acpi_handle handle, int state)
98{
99 return radeon_atpx_execute(handle, ATPX_GPU_PWR, state);
100}
101
102static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id)
103{
104 return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id);
105}
106
107static int radeon_atpx_switch_i2c_mux(acpi_handle handle, int mux_id)
108{
109 return radeon_atpx_execute(handle, ATPX_I2C_MUX_SELECT, mux_id);
110}
111
112static int radeon_atpx_switch_start(acpi_handle handle, int gpu_id)
113{
114 return radeon_atpx_execute(handle, ATPX_SWITCH_START, gpu_id);
115}
116
117static int radeon_atpx_switch_end(acpi_handle handle, int gpu_id)
118{
119 return radeon_atpx_execute(handle, ATPX_SWITCH_END, gpu_id);
120}
121
122static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
123{
124 int gpu_id;
125
126 if (id == VGA_SWITCHEROO_IGD)
127 gpu_id = ATPX_INTEGRATED;
128 else
129 gpu_id = ATPX_DISCRETE;
130
131 radeon_atpx_switch_start(radeon_atpx_priv.atpx_handle, gpu_id);
132 radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, gpu_id);
133 radeon_atpx_switch_i2c_mux(radeon_atpx_priv.atpx_handle, gpu_id);
134 radeon_atpx_switch_end(radeon_atpx_priv.atpx_handle, gpu_id);
135
136 return 0;
137}
138
139static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
140 enum vga_switcheroo_state state)
141{
142 /* on w500 ACPI can't change intel gpu state */
143 if (id == VGA_SWITCHEROO_IGD)
144 return 0;
145
146 radeon_atpx_set_discrete_state(radeon_atpx_priv.atpx_handle, state);
147 return 0;
148}
149
150static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
151{
152 acpi_handle dhandle, atpx_handle;
153 acpi_status status;
154
155 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
156 if (!dhandle)
157 return false;
158
159 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
160 if (ACPI_FAILURE(status))
161 return false;
162
163 radeon_atpx_priv.dhandle = dhandle;
164 radeon_atpx_priv.atpx_handle = atpx_handle;
165 return true;
166}
167
168static int radeon_atpx_init(void)
169{
170 /* set up the ATPX handle */
171
172 radeon_atpx_get_version(radeon_atpx_priv.atpx_handle);
173 return 0;
174}
175
176static int radeon_atpx_get_client_id(struct pci_dev *pdev)
177{
178 if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
179 return VGA_SWITCHEROO_IGD;
180 else
181 return VGA_SWITCHEROO_DIS;
182}
183
184static struct vga_switcheroo_handler radeon_atpx_handler = {
185 .switchto = radeon_atpx_switchto,
186 .power_state = radeon_atpx_power_state,
187 .init = radeon_atpx_init,
188 .get_client_id = radeon_atpx_get_client_id,
189};
190
191static bool radeon_atpx_detect(void)
192{
193 char acpi_method_name[255] = { 0 };
194 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
195 struct pci_dev *pdev = NULL;
196 bool has_atpx = false;
197 int vga_count = 0;
198
199 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
200 vga_count++;
201
202 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
203 }
204
205 if (has_atpx && vga_count == 2) {
206 acpi_get_name(radeon_atpx_priv.atpx_handle, ACPI_FULL_PATHNAME, &buffer);
207 printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
208 acpi_method_name);
209 radeon_atpx_priv.atpx_detected = true;
210 return true;
211 }
212 return false;
213}
214
215void radeon_register_atpx_handler(void)
216{
217 bool r;
218
219 /* detect if we have any ATPX + 2 VGA in the system */
220 r = radeon_atpx_detect();
221 if (!r)
222 return;
223
224 vga_switcheroo_register_handler(&radeon_atpx_handler);
225}
226
227void radeon_unregister_atpx_handler(void)
228{
229 vga_switcheroo_unregister_handler();
230}