1 files changed, 72 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
new file mode 100644
index 000000000000..9f95da4f0536
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2014 Advanced Micro Devices, Inc.
+ * Copyright 2008 Red Hat Inc.
+ * Copyright 2009 Jerome Glisse.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+#include <drm/drmP.h>
+#include "amdgpu.h"
+
+/*
+ * GPU scratch registers helpers function.
+ */
+/**
+ * amdgpu_gfx_scratch_get - Allocate a scratch register
+ *
+ * @adev: amdgpu_device pointer
+ * @reg: scratch register mmio offset
+ *
+ * Allocate a CP scratch register for use by the driver (all asics).
+ * Returns 0 on success or -EINVAL on failure.
+ */
+int amdgpu_gfx_scratch_get(struct amdgpu_device *adev, uint32_t *reg)
+{
+	int i;
+
+	for (i = 0; i < adev->gfx.scratch.num_reg; i++) {
+		if (adev->gfx.scratch.free[i]) {
+			adev->gfx.scratch.free[i] = false;
+			*reg = adev->gfx.scratch.reg[i];
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+/**
+ * amdgpu_gfx_scratch_free - Free a scratch register
+ *
+ * @adev: amdgpu_device pointer
+ * @reg: scratch register mmio offset
+ *
+ * Free a CP scratch register allocated for use by the driver (all asics)
+ */
+void amdgpu_gfx_scratch_free(struct amdgpu_device *adev, uint32_t reg)
+{
+	int i;
+
+	for (i = 0; i < adev->gfx.scratch.num_reg; i++) {
+		if (adev->gfx.scratch.reg[i] == reg) {
+			adev->gfx.scratch.free[i] = true;
+			return;
+		}
+	}
+}