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();
+}