Merge branch 'for-linus' to bring in change ensuring that drivers that
[pandora-kernel.git] / drivers / gpu / drm / radeon / radeon_atpx_handler.c
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
28 static 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 */
37 static 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, obj->buffer.length);
62         len = obj->buffer.length;
63         kfree(buffer.pointer);
64         return len;
65 }
66
67 bool radeon_atrm_supported(struct pci_dev *pdev)
68 {
69         /* get the discrete ROM only via ATRM */
70         if (!radeon_atpx_priv.atpx_detected)
71                 return false;
72
73         if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
74                 return false;
75         return true;
76 }
77
78
79 int radeon_atrm_get_bios_chunk(uint8_t *bios, int offset, int len)
80 {
81         return radeon_atrm_call(radeon_atpx_priv.atrm_handle, bios, offset, len);
82 }
83
84 static int radeon_atpx_get_version(acpi_handle handle)
85 {
86         acpi_status status;
87         union acpi_object atpx_arg_elements[2], *obj;
88         struct acpi_object_list atpx_arg;
89         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
90
91         atpx_arg.count = 2;
92         atpx_arg.pointer = &atpx_arg_elements[0];
93
94         atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
95         atpx_arg_elements[0].integer.value = ATPX_VERSION;
96
97         atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
98         atpx_arg_elements[1].integer.value = ATPX_VERSION;
99
100         status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
101         if (ACPI_FAILURE(status)) {
102                 printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
103                 return -ENOSYS;
104         }
105         obj = (union acpi_object *)buffer.pointer;
106         if (obj && (obj->type == ACPI_TYPE_BUFFER))
107                 printk(KERN_INFO "radeon atpx: version is %d\n", *((u8 *)(obj->buffer.pointer) + 2));
108         kfree(buffer.pointer);
109         return 0;
110 }
111
112 static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value)
113 {
114         acpi_status status;
115         union acpi_object atpx_arg_elements[2];
116         struct acpi_object_list atpx_arg;
117         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
118         uint8_t buf[4] = {0};
119
120         if (!handle)
121                 return -EINVAL;
122
123         atpx_arg.count = 2;
124         atpx_arg.pointer = &atpx_arg_elements[0];
125
126         atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
127         atpx_arg_elements[0].integer.value = cmd_id;
128
129         buf[2] = value & 0xff;
130         buf[3] = (value >> 8) & 0xff;
131
132         atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
133         atpx_arg_elements[1].buffer.length = 4;
134         atpx_arg_elements[1].buffer.pointer = buf;
135
136         status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
137         if (ACPI_FAILURE(status)) {
138                 printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
139                 return -ENOSYS;
140         }
141         kfree(buffer.pointer);
142
143         return 0;
144 }
145
146 static int radeon_atpx_set_discrete_state(acpi_handle handle, int state)
147 {
148         return radeon_atpx_execute(handle, ATPX_GPU_PWR, state);
149 }
150
151 static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id)
152 {
153         return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id);
154 }
155
156 static int radeon_atpx_switch_i2c_mux(acpi_handle handle, int mux_id)
157 {
158         return radeon_atpx_execute(handle, ATPX_I2C_MUX_SELECT, mux_id);
159 }
160
161 static int radeon_atpx_switch_start(acpi_handle handle, int gpu_id)
162 {
163         return radeon_atpx_execute(handle, ATPX_SWITCH_START, gpu_id);
164 }
165
166 static int radeon_atpx_switch_end(acpi_handle handle, int gpu_id)
167 {
168         return radeon_atpx_execute(handle, ATPX_SWITCH_END, gpu_id);
169 }
170
171 static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
172 {
173         int gpu_id;
174
175         if (id == VGA_SWITCHEROO_IGD)
176                 gpu_id = ATPX_INTEGRATED;
177         else
178                 gpu_id = ATPX_DISCRETE;
179
180         radeon_atpx_switch_start(radeon_atpx_priv.atpx_handle, gpu_id);
181         radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, gpu_id);
182         radeon_atpx_switch_i2c_mux(radeon_atpx_priv.atpx_handle, gpu_id);
183         radeon_atpx_switch_end(radeon_atpx_priv.atpx_handle, gpu_id);
184
185         return 0;
186 }
187
188 static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
189                                    enum vga_switcheroo_state state)
190 {
191         /* on w500 ACPI can't change intel gpu state */
192         if (id == VGA_SWITCHEROO_IGD)
193                 return 0;
194
195         radeon_atpx_set_discrete_state(radeon_atpx_priv.atpx_handle, state);
196         return 0;
197 }
198
199 static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
200 {
201         acpi_handle dhandle, atpx_handle, atrm_handle;
202         acpi_status status;
203
204         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
205         if (!dhandle)
206                 return false;
207
208         status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
209         if (ACPI_FAILURE(status))
210                 return false;
211
212         status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
213         if (ACPI_FAILURE(status))
214                 return false;
215
216         radeon_atpx_priv.dhandle = dhandle;
217         radeon_atpx_priv.atpx_handle = atpx_handle;
218         radeon_atpx_priv.atrm_handle = atrm_handle;
219         return true;
220 }
221
222 static int radeon_atpx_init(void)
223 {
224         /* set up the ATPX handle */
225
226         radeon_atpx_get_version(radeon_atpx_priv.atpx_handle);
227         return 0;
228 }
229
230 static int radeon_atpx_get_client_id(struct pci_dev *pdev)
231 {
232         if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
233                 return VGA_SWITCHEROO_IGD;
234         else
235                 return VGA_SWITCHEROO_DIS;
236 }
237
238 static struct vga_switcheroo_handler radeon_atpx_handler = {
239         .switchto = radeon_atpx_switchto,
240         .power_state = radeon_atpx_power_state,
241         .init = radeon_atpx_init,
242         .get_client_id = radeon_atpx_get_client_id,
243 };
244
245 static bool radeon_atpx_detect(void)
246 {
247         char acpi_method_name[255] = { 0 };
248         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
249         struct pci_dev *pdev = NULL;
250         bool has_atpx = false;
251         int vga_count = 0;
252
253         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
254                 vga_count++;
255
256                 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
257         }
258
259         if (has_atpx && vga_count == 2) {
260                 acpi_get_name(radeon_atpx_priv.atpx_handle, ACPI_FULL_PATHNAME, &buffer);
261                 printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
262                        acpi_method_name);
263                 radeon_atpx_priv.atpx_detected = true;
264                 return true;
265         }
266         return false;
267 }
268
269 void radeon_register_atpx_handler(void)
270 {
271         bool r;
272
273         /* detect if we have any ATPX + 2 VGA in the system */
274         r = radeon_atpx_detect();
275         if (!r)
276                 return;
277
278         vga_switcheroo_register_handler(&radeon_atpx_handler);
279 }
280
281 void radeon_unregister_atpx_handler(void)
282 {
283         vga_switcheroo_unregister_handler();
284 }