--- /dev/null
+/*
+ * 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 <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/pci.h>
+
+#include "amdgpu_acpi.h"
+
+struct amdgpu_atpx_functions {
+ bool px_params;
+ bool power_cntl;
+ bool disp_mux_cntl;
+ bool i2c_mux_cntl;
+ bool switch_start;
+ bool switch_end;
+ bool disp_connectors_mapping;
+ bool disp_detetion_ports;
+};
+
+struct amdgpu_atpx {
+ acpi_handle handle;
+ struct amdgpu_atpx_functions functions;
+};
+
+static struct amdgpu_atpx_priv {
+ bool atpx_detected;
+ /* handle for device - and atpx */
+ acpi_handle dhandle;
+ acpi_handle other_handle;
+ struct amdgpu_atpx atpx;
+} amdgpu_atpx_priv;
+
+struct atpx_verify_interface {
+ u16 size; /* structure size in bytes (includes size field) */
+ u16 version; /* version */
+ u32 function_bits; /* supported functions bit vector */
+} __packed;
+
+struct atpx_px_params {
+ u16 size; /* structure size in bytes (includes size field) */
+ u32 valid_flags; /* which flags are valid */
+ u32 flags; /* flags */
+} __packed;
+
+struct atpx_power_control {
+ u16 size;
+ u8 dgpu_state;
+} __packed;
+
+struct atpx_mux {
+ u16 size;
+ u16 mux;
+} __packed;
+
+bool amdgpu_has_atpx(void) {
+ return amdgpu_atpx_priv.atpx_detected;
+}
+
+/**
+ * amdgpu_atpx_call - call an ATPX method
+ *
+ * @handle: acpi handle
+ * @function: the ATPX function to execute
+ * @params: ATPX function params
+ *
+ * Executes the requested ATPX function (all asics).
+ * Returns a pointer to the acpi output buffer.
+ */
+static union acpi_object *amdgpu_atpx_call(acpi_handle handle, int function,
+ struct acpi_buffer *params)
+{
+ acpi_status status;
+ union acpi_object atpx_arg_elements[2];
+ 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 = function;
+
+ if (params) {
+ atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
+ atpx_arg_elements[1].buffer.length = params->length;
+ atpx_arg_elements[1].buffer.pointer = params->pointer;
+ } else {
+ /* We need a second fake parameter */
+ atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
+ atpx_arg_elements[1].integer.value = 0;
+ }
+
+ status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
+
+ /* Fail only if calling the method fails and ATPX is supported */
+ if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+ printk("failed to evaluate ATPX got %s\n",
+ acpi_format_exception(status));
+ kfree(buffer.pointer);
+ return NULL;
+ }
+
+ return buffer.pointer;
+}
+
+/**
+ * amdgpu_atpx_parse_functions - parse supported functions
+ *
+ * @f: supported functions struct
+ * @mask: supported functions mask from ATPX
+ *
+ * Use the supported functions mask from ATPX function
+ * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
+ * are supported (all asics).
+ */
+static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions *f, u32 mask)
+{
+ f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;
+ f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;
+ f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;
+ f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;
+ f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;
+ f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;
+ f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;
+ f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;
+}
+
+/**
+ * amdgpu_atpx_validate_functions - validate ATPX functions
+ *
+ * @atpx: amdgpu atpx struct
+ *
+ * Validate that required functions are enabled (all asics).
+ * returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx)
+{
+ /* make sure required functions are enabled */
+ /* dGPU power control is required */
+ atpx->functions.power_cntl = true;
+
+ if (atpx->functions.px_params) {
+ union acpi_object *info;
+ struct atpx_px_params output;
+ size_t size;
+ u32 valid_bits;
+
+ info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
+ if (!info)
+ return -EIO;
+
+ memset(&output, 0, sizeof(output));
+
+ size = *(u16 *) info->buffer.pointer;
+ if (size < 10) {
+ printk("ATPX buffer is too small: %zu\n", size);
+ kfree(info);
+ return -EINVAL;
+ }
+ size = min(sizeof(output), size);
+
+ memcpy(&output, info->buffer.pointer, size);
+
+ valid_bits = output.flags & output.valid_flags;
+ /* if separate mux flag is set, mux controls are required */
+ if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
+ atpx->functions.i2c_mux_cntl = true;
+ atpx->functions.disp_mux_cntl = true;
+ }
+ /* if any outputs are muxed, mux controls are required */
+ if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
+ ATPX_TV_SIGNAL_MUXED |
+ ATPX_DFP_SIGNAL_MUXED))
+ atpx->functions.disp_mux_cntl = true;
+
+ kfree(info);
+ }
+ return 0;
+}
+
+/**
+ * amdgpu_atpx_verify_interface - verify ATPX
+ *
+ * @atpx: amdgpu atpx struct
+ *
+ * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
+ * to initialize ATPX and determine what features are supported
+ * (all asics).
+ * returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_verify_interface(struct amdgpu_atpx *atpx)
+{
+ union acpi_object *info;
+ struct atpx_verify_interface output;
+ size_t size;
+ int err = 0;
+
+ info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
+ if (!info)
+ return -EIO;
+
+ memset(&output, 0, sizeof(output));
+
+ size = *(u16 *) info->buffer.pointer;
+ if (size < 8) {
+ printk("ATPX buffer is too small: %zu\n", size);
+ err = -EINVAL;
+ goto out;
+ }
+ size = min(sizeof(output), size);
+
+ memcpy(&output, info->buffer.pointer, size);
+
+ /* TODO: check version? */
+ printk("ATPX version %u, functions 0x%08x\n",
+ output.version, output.function_bits);
+
+ amdgpu_atpx_parse_functions(&atpx->functions, output.function_bits);
+
+out:
+ kfree(info);
+ return err;
+}
+
+/**
+ * amdgpu_atpx_set_discrete_state - power up/down discrete GPU
+ *
+ * @atpx: atpx info struct
+ * @state: discrete GPU state (0 = power down, 1 = power up)
+ *
+ * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
+ * power down/up the discrete GPU (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx *atpx, u8 state)
+{
+ struct acpi_buffer params;
+ union acpi_object *info;
+ struct atpx_power_control input;
+
+ if (atpx->functions.power_cntl) {
+ input.size = 3;
+ input.dgpu_state = state;
+ params.length = input.size;
+ params.pointer = &input;
+ info = amdgpu_atpx_call(atpx->handle,
+ ATPX_FUNCTION_POWER_CONTROL,
+ ¶ms);
+ if (!info)
+ return -EIO;
+ kfree(info);
+ }
+ return 0;
+}
+
+/**
+ * amdgpu_atpx_switch_disp_mux - switch display mux
+ *
+ * @atpx: atpx info struct
+ * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
+ *
+ * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
+ * switch the display mux between the discrete GPU and integrated GPU
+ * (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_switch_disp_mux(struct amdgpu_atpx *atpx, u16 mux_id)
+{
+ struct acpi_buffer params;
+ union acpi_object *info;
+ struct atpx_mux input;
+
+ if (atpx->functions.disp_mux_cntl) {
+ input.size = 4;
+ input.mux = mux_id;
+ params.length = input.size;
+ params.pointer = &input;
+ info = amdgpu_atpx_call(atpx->handle,
+ ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
+ ¶ms);
+ if (!info)
+ return -EIO;
+ kfree(info);
+ }
+ return 0;
+}
+
+/**
+ * amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux
+ *
+ * @atpx: atpx info struct
+ * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
+ *
+ * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
+ * switch the i2c/hpd mux between the discrete GPU and integrated GPU
+ * (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_switch_i2c_mux(struct amdgpu_atpx *atpx, u16 mux_id)
+{
+ struct acpi_buffer params;
+ union acpi_object *info;
+ struct atpx_mux input;
+
+ if (atpx->functions.i2c_mux_cntl) {
+ input.size = 4;
+ input.mux = mux_id;
+ params.length = input.size;
+ params.pointer = &input;
+ info = amdgpu_atpx_call(atpx->handle,
+ ATPX_FUNCTION_I2C_MUX_CONTROL,
+ ¶ms);
+ if (!info)
+ return -EIO;
+ kfree(info);
+ }
+ return 0;
+}
+
+/**
+ * amdgpu_atpx_switch_start - notify the sbios of a GPU switch
+ *
+ * @atpx: atpx info struct
+ * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
+ *
+ * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
+ * function to notify the sbios that a switch between the discrete GPU and
+ * integrated GPU has begun (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_switch_start(struct amdgpu_atpx *atpx, u16 mux_id)
+{
+ struct acpi_buffer params;
+ union acpi_object *info;
+ struct atpx_mux input;
+
+ if (atpx->functions.switch_start) {
+ input.size = 4;
+ input.mux = mux_id;
+ params.length = input.size;
+ params.pointer = &input;
+ info = amdgpu_atpx_call(atpx->handle,
+ ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
+ ¶ms);
+ if (!info)
+ return -EIO;
+ kfree(info);
+ }
+ return 0;
+}
+
+/**
+ * amdgpu_atpx_switch_end - notify the sbios of a GPU switch
+ *
+ * @atpx: atpx info struct
+ * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
+ *
+ * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
+ * function to notify the sbios that a switch between the discrete GPU and
+ * integrated GPU has ended (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_switch_end(struct amdgpu_atpx *atpx, u16 mux_id)
+{
+ struct acpi_buffer params;
+ union acpi_object *info;
+ struct atpx_mux input;
+
+ if (atpx->functions.switch_end) {
+ input.size = 4;
+ input.mux = mux_id;
+ params.length = input.size;
+ params.pointer = &input;
+ info = amdgpu_atpx_call(atpx->handle,
+ ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
+ ¶ms);
+ if (!info)
+ return -EIO;
+ kfree(info);
+ }
+ return 0;
+}
+
+/**
+ * amdgpu_atpx_switchto - switch to the requested GPU
+ *
+ * @id: GPU to switch to
+ *
+ * Execute the necessary ATPX functions to switch between the discrete GPU and
+ * integrated GPU (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_switchto(enum vga_switcheroo_client_id id)
+{
+ u16 gpu_id;
+
+ if (id == VGA_SWITCHEROO_IGD)
+ gpu_id = ATPX_INTEGRATED_GPU;
+ else
+ gpu_id = ATPX_DISCRETE_GPU;
+
+ amdgpu_atpx_switch_start(&amdgpu_atpx_priv.atpx, gpu_id);
+ amdgpu_atpx_switch_disp_mux(&amdgpu_atpx_priv.atpx, gpu_id);
+ amdgpu_atpx_switch_i2c_mux(&amdgpu_atpx_priv.atpx, gpu_id);
+ amdgpu_atpx_switch_end(&amdgpu_atpx_priv.atpx, gpu_id);
+
+ return 0;
+}
+
+/**
+ * amdgpu_atpx_power_state - power down/up the requested GPU
+ *
+ * @id: GPU to power down/up
+ * @state: requested power state (0 = off, 1 = on)
+ *
+ * Execute the necessary ATPX function to power down/up the discrete GPU
+ * (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_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;
+
+ amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv.atpx, state);
+ return 0;
+}
+
+/**
+ * amdgpu_atpx_pci_probe_handle - look up the ATPX handle
+ *
+ * @pdev: pci device
+ *
+ * Look up the ATPX handles (all asics).
+ * Returns true if the handles are found, false if not.
+ */
+static bool amdgpu_atpx_pci_probe_handle(struct pci_dev *pdev)
+{
+ acpi_handle dhandle, atpx_handle;
+ acpi_status status;
+
+ dhandle = ACPI_HANDLE(&pdev->dev);
+ if (!dhandle)
+ return false;
+
+ status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
+ if (ACPI_FAILURE(status)) {
+ amdgpu_atpx_priv.other_handle = dhandle;
+ return false;
+ }
+ amdgpu_atpx_priv.dhandle = dhandle;
+ amdgpu_atpx_priv.atpx.handle = atpx_handle;
+ return true;
+}
+
+/**
+ * amdgpu_atpx_init - verify the ATPX interface
+ *
+ * Verify the ATPX interface (all asics).
+ * Returns 0 on success, error on failure.
+ */
+static int amdgpu_atpx_init(void)
+{
+ int r;
+
+ /* set up the ATPX handle */
+ r = amdgpu_atpx_verify_interface(&amdgpu_atpx_priv.atpx);
+ if (r)
+ return r;
+
+ /* validate the atpx setup */
+ r = amdgpu_atpx_validate(&amdgpu_atpx_priv.atpx);
+ if (r)
+ return r;
+
+ return 0;
+}
+
+/**
+ * amdgpu_atpx_get_client_id - get the client id
+ *
+ * @pdev: pci device
+ *
+ * look up whether we are the integrated or discrete GPU (all asics).
+ * Returns the client id.
+ */
+static int amdgpu_atpx_get_client_id(struct pci_dev *pdev)
+{
+ if (amdgpu_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
+ return VGA_SWITCHEROO_IGD;
+ else
+ return VGA_SWITCHEROO_DIS;
+}
+
+static const struct vga_switcheroo_handler amdgpu_atpx_handler = {
+ .switchto = amdgpu_atpx_switchto,
+ .power_state = amdgpu_atpx_power_state,
+ .init = amdgpu_atpx_init,
+ .get_client_id = amdgpu_atpx_get_client_id,
+};
+
+/**
+ * amdgpu_atpx_detect - detect whether we have PX
+ *
+ * Check if we have a PX system (all asics).
+ * Returns true if we have a PX system, false if not.
+ */
+static bool amdgpu_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 |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
+ }
+
+ while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
+ vga_count++;
+
+ has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
+ }
+
+ if (has_atpx && vga_count == 2) {
+ acpi_get_name(amdgpu_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
+ printk(KERN_INFO "vga_switcheroo: detected switching method %s handle\n",
+ acpi_method_name);
+ amdgpu_atpx_priv.atpx_detected = true;
+ return true;
+ }
+ return false;
+}
+
+/**
+ * amdgpu_register_atpx_handler - register with vga_switcheroo
+ *
+ * Register the PX callbacks with vga_switcheroo (all asics).
+ */
+void amdgpu_register_atpx_handler(void)
+{
+ bool r;
+
+ /* detect if we have any ATPX + 2 VGA in the system */
+ r = amdgpu_atpx_detect();
+ if (!r)
+ return;
+
+ vga_switcheroo_register_handler(&amdgpu_atpx_handler);
+}
+
+/**
+ * amdgpu_unregister_atpx_handler - unregister with vga_switcheroo
+ *
+ * Unregister the PX callbacks with vga_switcheroo (all asics).
+ */
+void amdgpu_unregister_atpx_handler(void)
+{
+ vga_switcheroo_unregister_handler();
+}
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