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, len); 62 kfree(buffer.pointer); 63 return len; 64 } 65 66 bool 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 78 int 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 83 static 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 } 110 111 static 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 } 144 145 static int radeon_atpx_set_discrete_state(acpi_handle handle, int state) 146 { 147 return radeon_atpx_execute(handle, ATPX_GPU_PWR, state); 148 } 149 150 static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id) 151 { 152 return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id); 153 } 154 155 static 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 } 159 160 static int radeon_atpx_switch_start(acpi_handle handle, int gpu_id) 161 { 162 return radeon_atpx_execute(handle, ATPX_SWITCH_START, gpu_id); 163 } 164 165 static int radeon_atpx_switch_end(acpi_handle handle, int gpu_id) 166 { 167 return radeon_atpx_execute(handle, ATPX_SWITCH_END, gpu_id); 168 } 169 170 static 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 } 186 187 static 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 } 197 198 static 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 } 220 221 static 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 } 228 229 static 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 } 236 237 static 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 }; 243 244 static 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 } 267 268 void 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 } 279 280 void radeon_unregister_atpx_handler(void) 281 { 282 vga_switcheroo_unregister_handler(); 283 } 284