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>

1 files changed, 112 insertions, 0 deletions

diff --git a/drivers/gpu/drm/armada/armada_drm.h b/drivers/gpu/drm/armada/armada_drm.h
new file mode 100644
index 000000000000..e8c4f80c61d4
--- /dev/null
+++ b/drivers/gpu/drm/armada/armada_drm.h
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2012 Russell King
+ *
+ * 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 ARMADA_DRM_H
+#define ARMADA_DRM_H
+
+#include <linux/kfifo.h>
+#include <linux/io.h>
+#include <linux/workqueue.h>
+#include <drm/drmP.h>
+
+struct armada_crtc;
+struct armada_gem_object;
+struct clk;
+struct drm_fb_helper;
+
+static inline void
+armada_updatel(uint32_t val, uint32_t mask, void __iomem *ptr)
+{
+        uint32_t ov, v;
+
+        ov = v = readl_relaxed(ptr);
+        v = (v & ~mask) | val;
+        if (ov != v)
+                writel_relaxed(v, ptr);
+}
+
+static inline uint32_t armada_pitch(uint32_t width, uint32_t bpp)
+{
+        uint32_t pitch = bpp != 4 ? width * ((bpp + 7) / 8) : width / 2;
+
+        /* 88AP510 spec recommends pitch be a multiple of 128 */
+        return ALIGN(pitch, 128);
+}
+
+struct armada_vbl_event {
+        struct list_head        node;
+        void                    *data;
+        void                    (*fn)(struct armada_crtc *, void *);
+};
+void armada_drm_vbl_event_add(struct armada_crtc *,
+        struct armada_vbl_event *);
+void armada_drm_vbl_event_remove(struct armada_crtc *,
+        struct armada_vbl_event *);
+void armada_drm_vbl_event_remove_unlocked(struct armada_crtc *,
+        struct armada_vbl_event *);
+#define armada_drm_vbl_event_init(_e, _f, _d) do {      \
+        struct armada_vbl_event *__e = _e;              \
+        INIT_LIST_HEAD(&__e->node);                     \
+        __e->data = _d;                                 \
+        __e->fn = _f;                                   \
+} while (0)
+
+
+struct armada_private;
+
+struct armada_variant {
+        bool    has_spu_adv_reg;
+        int (*init)(struct armada_private *, struct device *);
+        int (*crtc_init)(struct armada_crtc *);
+        int (*crtc_compute_clock)(struct armada_crtc *,
+                                  const struct drm_display_mode *,
+                                  uint32_t *);
+};
+
+/* Variant ops */
+extern const struct armada_variant armada510_ops;
+
+struct armada_private {
+        const struct armada_variant *variant;
+        struct work_struct      fb_unref_work;
+        DECLARE_KFIFO(fb_unref, struct drm_framebuffer *, 8);
+        struct drm_fb_helper    *fbdev;
+        struct armada_crtc      *dcrtc[2];
+        struct drm_mm           linear;
+        struct clk              *extclk[2];
+        struct drm_property     *csc_yuv_prop;
+        struct drm_property     *csc_rgb_prop;
+        struct drm_property     *colorkey_prop;
+        struct drm_property     *colorkey_min_prop;
+        struct drm_property     *colorkey_max_prop;
+        struct drm_property     *colorkey_val_prop;
+        struct drm_property     *colorkey_alpha_prop;
+        struct drm_property     *colorkey_mode_prop;
+        struct drm_property     *brightness_prop;
+        struct drm_property     *contrast_prop;
+        struct drm_property     *saturation_prop;
+#ifdef CONFIG_DEBUG_FS
+        struct dentry           *de;
+#endif
+};
+
+void __armada_drm_queue_unref_work(struct drm_device *,
+        struct drm_framebuffer *);
+void armada_drm_queue_unref_work(struct drm_device *,
+        struct drm_framebuffer *);
+
+extern const struct drm_mode_config_funcs armada_drm_mode_config_funcs;
+
+int armada_fbdev_init(struct drm_device *);
+void armada_fbdev_fini(struct drm_device *);
+
+int armada_overlay_plane_create(struct drm_device *, unsigned long);
+
+int armada_drm_debugfs_init(struct drm_minor *);
+void armada_drm_debugfs_cleanup(struct drm_minor *);
+
+#endif