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6a9ee8af DA |
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 | */ | |
6a9ee8af | 9 | #include <linux/vga_switcheroo.h> |
5a0e3ad6 | 10 | #include <linux/slab.h> |
6a9ee8af DA |
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 | ||
19 | #define ATPX_INTEGRATED 0 | |
20 | #define ATPX_DISCRETE 1 | |
21 | ||
22 | #define ATPX_MUX_IGD 0 | |
23 | #define ATPX_MUX_DISCRETE 1 | |
24 | ||
25 | static struct radeon_atpx_priv { | |
26 | bool atpx_detected; | |
27 | /* handle for device - and atpx */ | |
28 | acpi_handle dhandle; | |
29 | acpi_handle atpx_handle; | |
30 | acpi_handle atrm_handle; | |
31 | } radeon_atpx_priv; | |
32 | ||
33 | /* retrieve the ROM in 4k blocks */ | |
34 | static int radeon_atrm_call(acpi_handle atrm_handle, uint8_t *bios, | |
35 | int offset, int len) | |
36 | { | |
37 | acpi_status status; | |
38 | union acpi_object atrm_arg_elements[2], *obj; | |
39 | struct acpi_object_list atrm_arg; | |
40 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; | |
41 | ||
42 | atrm_arg.count = 2; | |
43 | atrm_arg.pointer = &atrm_arg_elements[0]; | |
44 | ||
45 | atrm_arg_elements[0].type = ACPI_TYPE_INTEGER; | |
46 | atrm_arg_elements[0].integer.value = offset; | |
47 | ||
48 | atrm_arg_elements[1].type = ACPI_TYPE_INTEGER; | |
49 | atrm_arg_elements[1].integer.value = len; | |
50 | ||
51 | status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer); | |
52 | if (ACPI_FAILURE(status)) { | |
53 | printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status)); | |
54 | return -ENODEV; | |
55 | } | |
56 | ||
57 | obj = (union acpi_object *)buffer.pointer; | |
58 | memcpy(bios+offset, obj->buffer.pointer, len); | |
59 | kfree(buffer.pointer); | |
60 | return len; | |
61 | } | |
62 | ||
63 | bool radeon_atrm_supported(struct pci_dev *pdev) | |
64 | { | |
65 | /* get the discrete ROM only via ATRM */ | |
66 | if (!radeon_atpx_priv.atpx_detected) | |
67 | return false; | |
68 | ||
69 | if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev)) | |
70 | return false; | |
71 | return true; | |
72 | } | |
73 | ||
74 | ||
75 | int radeon_atrm_get_bios_chunk(uint8_t *bios, int offset, int len) | |
76 | { | |
77 | return radeon_atrm_call(radeon_atpx_priv.atrm_handle, bios, offset, len); | |
78 | } | |
79 | ||
80 | static int radeon_atpx_get_version(acpi_handle handle) | |
81 | { | |
82 | acpi_status status; | |
83 | union acpi_object atpx_arg_elements[2], *obj; | |
84 | struct acpi_object_list atpx_arg; | |
85 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
86 | ||
87 | atpx_arg.count = 2; | |
88 | atpx_arg.pointer = &atpx_arg_elements[0]; | |
89 | ||
90 | atpx_arg_elements[0].type = ACPI_TYPE_INTEGER; | |
91 | atpx_arg_elements[0].integer.value = ATPX_VERSION; | |
92 | ||
93 | atpx_arg_elements[1].type = ACPI_TYPE_INTEGER; | |
94 | atpx_arg_elements[1].integer.value = ATPX_VERSION; | |
95 | ||
96 | status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); | |
97 | if (ACPI_FAILURE(status)) { | |
98 | printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status)); | |
99 | return -ENOSYS; | |
100 | } | |
101 | obj = (union acpi_object *)buffer.pointer; | |
102 | if (obj && (obj->type == ACPI_TYPE_BUFFER)) | |
103 | printk(KERN_INFO "radeon atpx: version is %d\n", *((u8 *)(obj->buffer.pointer) + 2)); | |
104 | kfree(buffer.pointer); | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value) | |
109 | { | |
110 | acpi_status status; | |
111 | union acpi_object atpx_arg_elements[2]; | |
112 | struct acpi_object_list atpx_arg; | |
113 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
114 | uint8_t buf[4] = {0}; | |
115 | ||
116 | if (!handle) | |
117 | return -EINVAL; | |
118 | ||
119 | atpx_arg.count = 2; | |
120 | atpx_arg.pointer = &atpx_arg_elements[0]; | |
121 | ||
122 | atpx_arg_elements[0].type = ACPI_TYPE_INTEGER; | |
123 | atpx_arg_elements[0].integer.value = cmd_id; | |
124 | ||
125 | buf[2] = value & 0xff; | |
126 | buf[3] = (value >> 8) & 0xff; | |
127 | ||
128 | atpx_arg_elements[1].type = ACPI_TYPE_BUFFER; | |
129 | atpx_arg_elements[1].buffer.length = 4; | |
130 | atpx_arg_elements[1].buffer.pointer = buf; | |
131 | ||
132 | status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); | |
133 | if (ACPI_FAILURE(status)) { | |
134 | printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status)); | |
135 | return -ENOSYS; | |
136 | } | |
137 | kfree(buffer.pointer); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int radeon_atpx_set_discrete_state(acpi_handle handle, int state) | |
143 | { | |
144 | return radeon_atpx_execute(handle, ATPX_GPU_PWR, state); | |
145 | } | |
146 | ||
147 | static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id) | |
148 | { | |
149 | return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id); | |
150 | } | |
151 | ||
152 | ||
153 | static int radeon_atpx_switchto(enum vga_switcheroo_client_id id) | |
154 | { | |
155 | if (id == VGA_SWITCHEROO_IGD) | |
156 | radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, 0); | |
157 | else | |
158 | radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, 1); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | static int radeon_atpx_power_state(enum vga_switcheroo_client_id id, | |
163 | enum vga_switcheroo_state state) | |
164 | { | |
165 | /* on w500 ACPI can't change intel gpu state */ | |
166 | if (id == VGA_SWITCHEROO_IGD) | |
167 | return 0; | |
168 | ||
169 | radeon_atpx_set_discrete_state(radeon_atpx_priv.atpx_handle, state); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev) | |
174 | { | |
175 | acpi_handle dhandle, atpx_handle, atrm_handle; | |
176 | acpi_status status; | |
177 | ||
178 | dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); | |
179 | if (!dhandle) | |
180 | return false; | |
181 | ||
182 | status = acpi_get_handle(dhandle, "ATPX", &atpx_handle); | |
183 | if (ACPI_FAILURE(status)) | |
184 | return false; | |
185 | ||
186 | status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); | |
187 | if (ACPI_FAILURE(status)) | |
188 | return false; | |
189 | ||
190 | radeon_atpx_priv.dhandle = dhandle; | |
191 | radeon_atpx_priv.atpx_handle = atpx_handle; | |
192 | radeon_atpx_priv.atrm_handle = atrm_handle; | |
193 | return true; | |
194 | } | |
195 | ||
196 | static int radeon_atpx_init(void) | |
197 | { | |
198 | /* set up the ATPX handle */ | |
199 | ||
200 | radeon_atpx_get_version(radeon_atpx_priv.atpx_handle); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int radeon_atpx_get_client_id(struct pci_dev *pdev) | |
205 | { | |
206 | if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev)) | |
207 | return VGA_SWITCHEROO_IGD; | |
208 | else | |
209 | return VGA_SWITCHEROO_DIS; | |
210 | } | |
211 | ||
212 | static struct vga_switcheroo_handler radeon_atpx_handler = { | |
213 | .switchto = radeon_atpx_switchto, | |
214 | .power_state = radeon_atpx_power_state, | |
215 | .init = radeon_atpx_init, | |
216 | .get_client_id = radeon_atpx_get_client_id, | |
217 | }; | |
218 | ||
219 | static bool radeon_atpx_detect(void) | |
220 | { | |
221 | char acpi_method_name[255] = { 0 }; | |
222 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; | |
223 | struct pci_dev *pdev = NULL; | |
224 | bool has_atpx = false; | |
225 | int vga_count = 0; | |
226 | ||
227 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { | |
228 | vga_count++; | |
229 | ||
230 | has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true); | |
231 | } | |
232 | ||
233 | if (has_atpx && vga_count == 2) { | |
234 | acpi_get_name(radeon_atpx_priv.atpx_handle, ACPI_FULL_PATHNAME, &buffer); | |
235 | printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n", | |
236 | acpi_method_name); | |
237 | radeon_atpx_priv.atpx_detected = true; | |
238 | return true; | |
239 | } | |
240 | return false; | |
241 | } | |
242 | ||
243 | void radeon_register_atpx_handler(void) | |
244 | { | |
245 | bool r; | |
246 | ||
247 | /* detect if we have any ATPX + 2 VGA in the system */ | |
248 | r = radeon_atpx_detect(); | |
249 | if (!r) | |
250 | return; | |
251 | ||
252 | vga_switcheroo_register_handler(&radeon_atpx_handler); | |
253 | } | |
254 | ||
255 | void radeon_unregister_atpx_handler(void) | |
256 | { | |
257 | vga_switcheroo_unregister_handler(); | |
258 | } |