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 } 285