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path: root/drivers/gpu/drm/tegra/bus.c
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Diffstat (limited to 'drivers/gpu/drm/tegra/bus.c')
-rw-r--r--drivers/gpu/drm/tegra/bus.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/bus.c b/drivers/gpu/drm/tegra/bus.c
new file mode 100644
index 000000000000..565f8f7b9a47
--- /dev/null
+++ b/drivers/gpu/drm/tegra/bus.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2013 NVIDIA Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "drm.h"
+
+static int drm_host1x_set_busid(struct drm_device *dev,
+ struct drm_master *master)
+{
+ const char *device = dev_name(dev->dev);
+ const char *driver = dev->driver->name;
+ const char *bus = dev->dev->bus->name;
+ int length;
+
+ master->unique_len = strlen(bus) + 1 + strlen(device);
+ master->unique_size = master->unique_len;
+
+ master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
+ if (!master->unique)
+ return -ENOMEM;
+
+ snprintf(master->unique, master->unique_len + 1, "%s:%s", bus, device);
+
+ length = strlen(driver) + 1 + master->unique_len;
+
+ dev->devname = kmalloc(length + 1, GFP_KERNEL);
+ if (!dev->devname)
+ return -ENOMEM;
+
+ snprintf(dev->devname, length + 1, "%s@%s", driver, master->unique);
+
+ return 0;
+}
+
+static struct drm_bus drm_host1x_bus = {
+ .bus_type = DRIVER_BUS_HOST1X,
+ .set_busid = drm_host1x_set_busid,
+};
+
+int drm_host1x_init(struct drm_driver *driver, struct host1x_device *device)
+{
+ struct drm_device *drm;
+ int ret;
+
+ INIT_LIST_HEAD(&driver->device_list);
+ driver->bus = &drm_host1x_bus;
+
+ drm = drm_dev_alloc(driver, &device->dev);
+ if (!drm)
+ return -ENOMEM;
+
+ ret = drm_dev_register(drm, 0);
+ if (ret)
+ goto err_free;
+
+ DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
+ driver->major, driver->minor, driver->patchlevel,
+ driver->date, drm->primary->index);
+
+ return 0;
+
+err_free:
+ drm_dev_free(drm);
+ return ret;
+}
+
+void drm_host1x_exit(struct drm_driver *driver, struct host1x_device *device)
+{
+ struct tegra_drm *tegra = dev_get_drvdata(&device->dev);
+
+ drm_put_dev(tegra->drm);
+}