2 #include <linux/acpi.h>
3 #include <linux/slab.h>
4 #include <acpi/acpi_drivers.h>
5 #include <acpi/acpi_bus.h>
10 #include "drm_crtc_helper.h"
11 #include "nouveau_drv.h"
12 #include "nouveau_drm.h"
13 #include "nv50_display.h"
15 #include <linux/vga_switcheroo.h>
17 #define NOUVEAU_DSM_SUPPORTED 0x00
18 #define NOUVEAU_DSM_SUPPORTED_FUNCTIONS 0x00
20 #define NOUVEAU_DSM_ACTIVE 0x01
21 #define NOUVEAU_DSM_ACTIVE_QUERY 0x00
23 #define NOUVEAU_DSM_LED 0x02
24 #define NOUVEAU_DSM_LED_STATE 0x00
25 #define NOUVEAU_DSM_LED_OFF 0x10
26 #define NOUVEAU_DSM_LED_STAMINA 0x11
27 #define NOUVEAU_DSM_LED_SPEED 0x12
29 #define NOUVEAU_DSM_POWER 0x03
30 #define NOUVEAU_DSM_POWER_STATE 0x00
31 #define NOUVEAU_DSM_POWER_SPEED 0x01
32 #define NOUVEAU_DSM_POWER_STAMINA 0x02
34 static struct nouveau_dsm_priv {
37 acpi_handle dsm_handle;
38 acpi_handle rom_handle;
41 static const char nouveau_dsm_muid[] = {
42 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
43 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
46 static int nouveau_dsm(acpi_handle handle, int func, int arg, int *result)
48 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
49 struct acpi_object_list input;
50 union acpi_object params[4];
51 union acpi_object *obj;
55 input.pointer = params;
56 params[0].type = ACPI_TYPE_BUFFER;
57 params[0].buffer.length = sizeof(nouveau_dsm_muid);
58 params[0].buffer.pointer = (char *)nouveau_dsm_muid;
59 params[1].type = ACPI_TYPE_INTEGER;
60 params[1].integer.value = 0x00000102;
61 params[2].type = ACPI_TYPE_INTEGER;
62 params[2].integer.value = func;
63 params[3].type = ACPI_TYPE_INTEGER;
64 params[3].integer.value = arg;
66 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
68 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
72 obj = (union acpi_object *)output.pointer;
74 if (obj->type == ACPI_TYPE_INTEGER)
75 if (obj->integer.value == 0x80000002)
78 if (obj->type == ACPI_TYPE_BUFFER) {
79 if (obj->buffer.length == 4 && result) {
81 *result |= obj->buffer.pointer[0];
82 *result |= (obj->buffer.pointer[1] << 8);
83 *result |= (obj->buffer.pointer[2] << 16);
84 *result |= (obj->buffer.pointer[3] << 24);
88 kfree(output.pointer);
92 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
94 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
97 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
100 if (state == VGA_SWITCHEROO_ON)
101 arg = NOUVEAU_DSM_POWER_SPEED;
103 arg = NOUVEAU_DSM_POWER_STAMINA;
104 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
108 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
110 if (id == VGA_SWITCHEROO_IGD)
111 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dsm_handle, NOUVEAU_DSM_LED_STAMINA);
113 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dsm_handle, NOUVEAU_DSM_LED_SPEED);
116 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
117 enum vga_switcheroo_state state)
119 if (id == VGA_SWITCHEROO_IGD)
122 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dsm_handle, state);
125 static int nouveau_dsm_init(void)
130 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
132 if (nouveau_dsm_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
133 return VGA_SWITCHEROO_IGD;
135 return VGA_SWITCHEROO_DIS;
138 static struct vga_switcheroo_handler nouveau_dsm_handler = {
139 .switchto = nouveau_dsm_switchto,
140 .power_state = nouveau_dsm_power_state,
141 .init = nouveau_dsm_init,
142 .get_client_id = nouveau_dsm_get_client_id,
145 static bool nouveau_dsm_pci_probe(struct pci_dev *pdev)
147 acpi_handle dhandle, nvidia_handle;
152 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
156 status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
157 if (ACPI_FAILURE(status)) {
161 ret = nouveau_dsm(nvidia_handle, NOUVEAU_DSM_SUPPORTED,
162 NOUVEAU_DSM_SUPPORTED_FUNCTIONS, &result);
166 nouveau_dsm_priv.dhandle = dhandle;
167 nouveau_dsm_priv.dsm_handle = nvidia_handle;
171 static bool nouveau_dsm_detect(void)
173 char acpi_method_name[255] = { 0 };
174 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
175 struct pci_dev *pdev = NULL;
179 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
182 has_dsm |= (nouveau_dsm_pci_probe(pdev) == true);
185 if (vga_count == 2 && has_dsm) {
186 acpi_get_name(nouveau_dsm_priv.dsm_handle, ACPI_FULL_PATHNAME, &buffer);
187 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
189 nouveau_dsm_priv.dsm_detected = true;
195 void nouveau_register_dsm_handler(void)
199 r = nouveau_dsm_detect();
203 vga_switcheroo_register_handler(&nouveau_dsm_handler);
206 void nouveau_unregister_dsm_handler(void)
208 vga_switcheroo_unregister_handler();
211 /* retrieve the ROM in 4k blocks */
212 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
216 union acpi_object rom_arg_elements[2], *obj;
217 struct acpi_object_list rom_arg;
218 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
221 rom_arg.pointer = &rom_arg_elements[0];
223 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
224 rom_arg_elements[0].integer.value = offset;
226 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
227 rom_arg_elements[1].integer.value = len;
229 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
230 if (ACPI_FAILURE(status)) {
231 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
234 obj = (union acpi_object *)buffer.pointer;
235 memcpy(bios+offset, obj->buffer.pointer, len);
236 kfree(buffer.pointer);
240 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
243 acpi_handle dhandle, rom_handle;
245 if (!nouveau_dsm_priv.dsm_detected)
248 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
252 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
253 if (ACPI_FAILURE(status))
256 nouveau_dsm_priv.rom_handle = rom_handle;
260 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
262 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);