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