drm/nouveau/core: add firmware handling functions

Add two functions nvkm_firmware_get() and nvkm_firmware_put() to load a
firmware file and free its resources, respectively. Since firmware files
are becoming a necessity for new GPUs, and their location has been
standardized to nvidia/chip/, this will prevent duplicate and
error-prone name-generation code.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/core/firmware.h

+#ifndef __NVKM_FIRMWARE_H__
+#define __NVKM_FIRMWARE_H__
+
+#include <core/device.h>
+
+int nvkm_firmware_get(struct nvkm_device *device, const char *fwname,
+		      const struct firmware **fw);
+
+void nvkm_firmware_put(const struct firmware *fw);
+
+#endif

drivers/gpu/drm/nouveau/nvkm/core/Kbuild

@@ -2,6 +2,7 @@ nvkm-y := nvkm/core/client.o
 nvkm-y += nvkm/core/engine.o
 nvkm-y += nvkm/core/enum.o
 nvkm-y += nvkm/core/event.o
+nvkm-y += nvkm/core/firmware.o
 nvkm-y += nvkm/core/gpuobj.o
 nvkm-y += nvkm/core/ioctl.o
 nvkm-y += nvkm/core/memory.o

drivers/gpu/drm/nouveau/nvkm/core/firmware.c

+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+ *
+ * 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 AUTHORS OR COPYRIGHT HOLDERS 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 <core/device.h>
+
+/**
+ * nvkm_firmware_get - load firmware from the official nvidia/chip/ directory
+ * @device	device that will use that firmware
+ * @fwname	name of firmware file to load
+ * @fw		firmware structure to load to
+ *
+ * Use this function to load firmware files in the form nvidia/chip/fwname.bin.
+ * Firmware files released by NVIDIA will always follow this format.
+ */
+int
+nvkm_firmware_get(struct nvkm_device *device, const char *fwname,
+		  const struct firmware **fw)
+{
+	char f[64];
+	char cname[16];
+	int i;
+
+	/* Convert device name to lowercase */
+	strncpy(cname, device->chip->name, sizeof(cname));
+	cname[sizeof(cname) - 1] = '\0';
+	i = strlen(cname);
+	while (i) {
+		--i;
+		cname[i] = tolower(cname[i]);
+	}
+
+	snprintf(f, sizeof(f), "nvidia/%s/%s.bin", cname, fwname);
+	return request_firmware(fw, f, device->dev);
+}
+
+/**
+ * nvkm_firmware_put - release firmware loaded with nvkm_firmware_get
+ */
+void
+nvkm_firmware_put(const struct firmware *fw)
+{
+	release_firmware(fw);
+}