DRM: Armada: Add Armada DRM driver

This patch adds support for the pair of LCD controllers on the Marvell
Armada 510 SoCs.  This driver supports:
- multiple contiguous scanout buffers for video and graphics
- shm backed cacheable buffer objects for X pixmaps for Vivante GPU
  acceleration
- dual lcd0 and lcd1 crt operation
- video overlay on each LCD crt via DRM planes
- page flipping of the main scanout buffers
- DRM prime for buffer export/import

This driver is trivial to extend to other Armada SoCs.

Included in this commit is the core driver with no output support; output
support is platform and encoder driver dependent.

Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 62 insertions, 0 deletions

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 24f499569a2f..e5e6e9124cbc 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1135,4 +1135,21 @@ extern int drm_format_horz_chroma_subsampling(uint32_t format);
 extern int drm_format_vert_chroma_subsampling(uint32_t format);
 extern const char *drm_get_format_name(uint32_t format);
 
+/* Helpers */
+static inline struct drm_crtc *drm_crtc_find(struct drm_device *dev,
+        uint32_t id)
+{
+        struct drm_mode_object *mo;
+        mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_CRTC);
+        return mo ? obj_to_crtc(mo) : NULL;
+}
+
+static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev,
+        uint32_t id)
+{
+        struct drm_mode_object *mo;
+        mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_ENCODER);
+        return mo ? obj_to_encoder(mo) : NULL;
+}
+
 #endif /* __DRM_CRTC_H__ */
diff --git a/include/uapi/drm/armada_drm.h b/include/uapi/drm/armada_drm.h
new file mode 100644
index 000000000000..8dec3fdc99c7
--- /dev/null
+++ b/include/uapi/drm/armada_drm.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2012 Russell King
+ *  With inspiration from the i915 driver
+ *
+ * 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.
+ */
+#ifndef DRM_ARMADA_IOCTL_H
+#define DRM_ARMADA_IOCTL_H
+
+#define DRM_ARMADA_GEM_CREATE           0x00
+#define DRM_ARMADA_GEM_MMAP             0x02
+#define DRM_ARMADA_GEM_PWRITE           0x03
+
+#define ARMADA_IOCTL(dir, name, str) \
+        DRM_##dir(DRM_COMMAND_BASE + DRM_ARMADA_##name, struct drm_armada_##str)
+
+struct drm_armada_gem_create {
+        uint32_t handle;
+        uint32_t size;
+};
+#define DRM_IOCTL_ARMADA_GEM_CREATE \
+        ARMADA_IOCTL(IOWR, GEM_CREATE, gem_create)
+
+struct drm_armada_gem_mmap {
+        uint32_t handle;
+        uint32_t pad;
+        uint64_t offset;
+        uint64_t size;
+        uint64_t addr;
+};
+#define DRM_IOCTL_ARMADA_GEM_MMAP \
+        ARMADA_IOCTL(IOWR, GEM_MMAP, gem_mmap)
+
+struct drm_armada_gem_pwrite {
+        uint64_t ptr;
+        uint32_t handle;
+        uint32_t offset;
+        uint32_t size;
+};
+#define DRM_IOCTL_ARMADA_GEM_PWRITE \
+        ARMADA_IOCTL(IOW, GEM_PWRITE, gem_pwrite)
+
+#endif