diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_atpx_handler.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_atpx_handler.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_atpx_handler.c b/drivers/gpu/drm/radeon/radeon_atpx_handler.c new file mode 100644 index 000000000000..0ae52f19071d --- /dev/null +++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c @@ -0,0 +1,258 @@ +/* + * Copyright (c) 2010 Red Hat Inc. + * Author : Dave Airlie <airlied@redhat.com> + * + * Licensed under GPLv2 + * + * ATPX support for both Intel/ATI + */ + +#include <linux/vga_switcheroo.h> +#include <acpi/acpi.h> +#include <acpi/acpi_bus.h> +#include <linux/pci.h> + +#define ATPX_VERSION 0 +#define ATPX_GPU_PWR 2 +#define ATPX_MUX_SELECT 3 + +#define ATPX_INTEGRATED 0 +#define ATPX_DISCRETE 1 + +#define ATPX_MUX_IGD 0 +#define ATPX_MUX_DISCRETE 1 + +static struct radeon_atpx_priv { + bool atpx_detected; + /* handle for device - and atpx */ + acpi_handle dhandle; + acpi_handle atpx_handle; + acpi_handle atrm_handle; +} radeon_atpx_priv; + +/* retrieve the ROM in 4k blocks */ +static int radeon_atrm_call(acpi_handle atrm_handle, uint8_t *bios, + int offset, int len) +{ + acpi_status status; + union acpi_object atrm_arg_elements[2], *obj; + struct acpi_object_list atrm_arg; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; + + atrm_arg.count = 2; + atrm_arg.pointer = &atrm_arg_elements[0]; + + atrm_arg_elements[0].type = ACPI_TYPE_INTEGER; + atrm_arg_elements[0].integer.value = offset; + + atrm_arg_elements[1].type = ACPI_TYPE_INTEGER; + atrm_arg_elements[1].integer.value = len; + + status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer); + if (ACPI_FAILURE(status)) { + printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status)); + return -ENODEV; + } + + obj = (union acpi_object *)buffer.pointer; + memcpy(bios+offset, obj->buffer.pointer, len); + kfree(buffer.pointer); + return len; +} + +bool radeon_atrm_supported(struct pci_dev *pdev) +{ + /* get the discrete ROM only via ATRM */ + if (!radeon_atpx_priv.atpx_detected) + return false; + + if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev)) + return false; + return true; +} + + +int radeon_atrm_get_bios_chunk(uint8_t *bios, int offset, int len) +{ + return radeon_atrm_call(radeon_atpx_priv.atrm_handle, bios, offset, len); +} + +static int radeon_atpx_get_version(acpi_handle handle) +{ + acpi_status status; + union acpi_object atpx_arg_elements[2], *obj; + struct acpi_object_list atpx_arg; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + + atpx_arg.count = 2; + atpx_arg.pointer = &atpx_arg_elements[0]; + + atpx_arg_elements[0].type = ACPI_TYPE_INTEGER; + atpx_arg_elements[0].integer.value = ATPX_VERSION; + + atpx_arg_elements[1].type = ACPI_TYPE_INTEGER; + atpx_arg_elements[1].integer.value = ATPX_VERSION; + + status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); + if (ACPI_FAILURE(status)) { + printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status)); + return -ENOSYS; + } + obj = (union acpi_object *)buffer.pointer; + if (obj && (obj->type == ACPI_TYPE_BUFFER)) + printk(KERN_INFO "radeon atpx: version is %d\n", *((u8 *)(obj->buffer.pointer) + 2)); + kfree(buffer.pointer); + return 0; +} + +static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value) +{ + acpi_status status; + union acpi_object atpx_arg_elements[2]; + struct acpi_object_list atpx_arg; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + uint8_t buf[4] = {0}; + + if (!handle) + return -EINVAL; + + atpx_arg.count = 2; + atpx_arg.pointer = &atpx_arg_elements[0]; + + atpx_arg_elements[0].type = ACPI_TYPE_INTEGER; + atpx_arg_elements[0].integer.value = cmd_id; + + buf[2] = value & 0xff; + buf[3] = (value >> 8) & 0xff; + + atpx_arg_elements[1].type = ACPI_TYPE_BUFFER; + atpx_arg_elements[1].buffer.length = 4; + atpx_arg_elements[1].buffer.pointer = buf; + + status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); + if (ACPI_FAILURE(status)) { + printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status)); + return -ENOSYS; + } + kfree(buffer.pointer); + + return 0; +} + +static int radeon_atpx_set_discrete_state(acpi_handle handle, int state) +{ + return radeon_atpx_execute(handle, ATPX_GPU_PWR, state); +} + +static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id) +{ + return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id); +} + + +static int radeon_atpx_switchto(enum vga_switcheroo_client_id id) +{ + if (id == VGA_SWITCHEROO_IGD) + radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, 0); + else + radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, 1); + return 0; +} + +static int radeon_atpx_power_state(enum vga_switcheroo_client_id id, + enum vga_switcheroo_state state) +{ + /* on w500 ACPI can't change intel gpu state */ + if (id == VGA_SWITCHEROO_IGD) + return 0; + + radeon_atpx_set_discrete_state(radeon_atpx_priv.atpx_handle, state); + return 0; +} + +static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev) +{ + acpi_handle dhandle, atpx_handle, atrm_handle; + acpi_status status; + + dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); + if (!dhandle) + return false; + + status = acpi_get_handle(dhandle, "ATPX", &atpx_handle); + if (ACPI_FAILURE(status)) + return false; + + status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); + if (ACPI_FAILURE(status)) + return false; + + radeon_atpx_priv.dhandle = dhandle; + radeon_atpx_priv.atpx_handle = atpx_handle; + radeon_atpx_priv.atrm_handle = atrm_handle; + return true; +} + +static int radeon_atpx_init(void) +{ + /* set up the ATPX handle */ + + radeon_atpx_get_version(radeon_atpx_priv.atpx_handle); + return 0; +} + +static int radeon_atpx_get_client_id(struct pci_dev *pdev) +{ + if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev)) + return VGA_SWITCHEROO_IGD; + else + return VGA_SWITCHEROO_DIS; +} + +static struct vga_switcheroo_handler radeon_atpx_handler = { + .switchto = radeon_atpx_switchto, + .power_state = radeon_atpx_power_state, + .init = radeon_atpx_init, + .get_client_id = radeon_atpx_get_client_id, +}; + +static bool radeon_atpx_detect(void) +{ + char acpi_method_name[255] = { 0 }; + struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; + struct pci_dev *pdev = NULL; + bool has_atpx = false; + int vga_count = 0; + + while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { + vga_count++; + + has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true); + } + + if (has_atpx && vga_count == 2) { + acpi_get_name(radeon_atpx_priv.atpx_handle, ACPI_FULL_PATHNAME, &buffer); + printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n", + acpi_method_name); + radeon_atpx_priv.atpx_detected = true; + return true; + } + return false; +} + +void radeon_register_atpx_handler(void) +{ + bool r; + + /* detect if we have any ATPX + 2 VGA in the system */ + r = radeon_atpx_detect(); + if (!r) + return; + + vga_switcheroo_register_handler(&radeon_atpx_handler); +} + +void radeon_unregister_atpx_handler(void) +{ + vga_switcheroo_unregister_handler(); +} |