drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.

This patch adds an initial DRM driver for the Mediatek MT8173 DISP
subsystem. It currently supports two fixed output streams from the
OVL0/OVL1 sources to the DSI0/DPI0 sinks, respectively.

Signed-off-by: CK Hu <ck.hu@mediatek.com>
Signed-off-by: YT Shen <yt.shen@mediatek.com>
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
Signed-off-by: Mao Huang <littlecvr@chromium.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

1 files changed, 269 insertions, 0 deletions

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
new file mode 100644
index 000000000000..a773bfaea913
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
@@ -0,0 +1,269 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_gem.h>
+#include <linux/dma-buf.h>
+
+#include "mtk_drm_drv.h"
+#include "mtk_drm_gem.h"
+
+static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
+						unsigned long size)
+{
+	struct mtk_drm_gem_obj *mtk_gem_obj;
+	int ret;
+
+	size = round_up(size, PAGE_SIZE);
+
+	mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
+	if (!mtk_gem_obj)
+		return ERR_PTR(-ENOMEM);
+
+	ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
+	if (ret < 0) {
+		DRM_ERROR("failed to initialize gem object\n");
+		kfree(mtk_gem_obj);
+		return ERR_PTR(ret);
+	}
+
+	return mtk_gem_obj;
+}
+
+struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
+					   size_t size, bool alloc_kmap)
+{
+	struct mtk_drm_private *priv = dev->dev_private;
+	struct mtk_drm_gem_obj *mtk_gem;
+	struct drm_gem_object *obj;
+	int ret;
+
+	mtk_gem = mtk_drm_gem_init(dev, size);
+	if (IS_ERR(mtk_gem))
+		return ERR_CAST(mtk_gem);
+
+	obj = &mtk_gem->base;
+
+	init_dma_attrs(&mtk_gem->dma_attrs);
+	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &mtk_gem->dma_attrs);
+
+	if (!alloc_kmap)
+		dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &mtk_gem->dma_attrs);
+
+	mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
+					  &mtk_gem->dma_addr, GFP_KERNEL,
+					  &mtk_gem->dma_attrs);
+	if (!mtk_gem->cookie) {
+		DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
+		ret = -ENOMEM;
+		goto err_gem_free;
+	}
+
+	if (alloc_kmap)
+		mtk_gem->kvaddr = mtk_gem->cookie;
+
+	DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
+			 mtk_gem->cookie, &mtk_gem->dma_addr,
+			 size);
+
+	return mtk_gem;
+
+err_gem_free:
+	drm_gem_object_release(obj);
+	kfree(mtk_gem);
+	return ERR_PTR(ret);
+}
+
+void mtk_drm_gem_free_object(struct drm_gem_object *obj)
+{
+	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
+	struct mtk_drm_private *priv = obj->dev->dev_private;
+
+	if (mtk_gem->sg)
+		drm_prime_gem_destroy(obj, mtk_gem->sg);
+	else
+		dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
+			       mtk_gem->dma_addr, &mtk_gem->dma_attrs);
+
+	/* release file pointer to gem object. */
+	drm_gem_object_release(obj);
+
+	kfree(mtk_gem);
+}
+
+int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
+			    struct drm_mode_create_dumb *args)
+{
+	struct mtk_drm_gem_obj *mtk_gem;
+	int ret;
+
+	args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+	args->size = args->pitch * args->height;
+
+	mtk_gem = mtk_drm_gem_create(dev, args->size, false);
+	if (IS_ERR(mtk_gem))
+		return PTR_ERR(mtk_gem);
+
+	/*
+	 * allocate a id of idr table where the obj is registered
+	 * and handle has the id what user can see.
+	 */
+	ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
+	if (ret)
+		goto err_handle_create;
+
+	/* drop reference from allocate - handle holds it now. */
+	drm_gem_object_unreference_unlocked(&mtk_gem->base);
+
+	return 0;
+
+err_handle_create:
+	mtk_drm_gem_free_object(&mtk_gem->base);
+	return ret;
+}
+
+int mtk_drm_gem_dumb_map_offset(struct drm_file *file_priv,
+				struct drm_device *dev, uint32_t handle,
+				uint64_t *offset)
+{
+	struct drm_gem_object *obj;
+	int ret;
+
+	obj = drm_gem_object_lookup(dev, file_priv, handle);
+	if (!obj) {
+		DRM_ERROR("failed to lookup gem object.\n");
+		return -EINVAL;
+	}
+
+	ret = drm_gem_create_mmap_offset(obj);
+	if (ret)
+		goto out;
+
+	*offset = drm_vma_node_offset_addr(&obj->vma_node);
+	DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
+
+out:
+	drm_gem_object_unreference_unlocked(obj);
+	return ret;
+}
+
+static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
+				   struct vm_area_struct *vma)
+
+{
+	int ret;
+	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
+	struct mtk_drm_private *priv = obj->dev->dev_private;
+
+	/*
+	 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
+	 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
+	 */
+	vma->vm_flags &= ~VM_PFNMAP;
+	vma->vm_pgoff = 0;
+
+	ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
+			     mtk_gem->dma_addr, obj->size, &mtk_gem->dma_attrs);
+	if (ret)
+		drm_gem_vm_close(vma);
+
+	return ret;
+}
+
+int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
+{
+	int ret;
+
+	ret = drm_gem_mmap_obj(obj, obj->size, vma);
+	if (ret)
+		return ret;
+
+	return mtk_drm_gem_object_mmap(obj, vma);
+}
+
+int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct drm_gem_object *obj;
+	int ret;
+
+	ret = drm_gem_mmap(filp, vma);
+	if (ret)
+		return ret;
+
+	obj = vma->vm_private_data;
+
+	return mtk_drm_gem_object_mmap(obj, vma);
+}
+
+/*
+ * Allocate a sg_table for this GEM object.
+ * Note: Both the table's contents, and the sg_table itself must be freed by
+ *       the caller.
+ * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
+ */
+struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
+{
+	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
+	struct mtk_drm_private *priv = obj->dev->dev_private;
+	struct sg_table *sgt;
+	int ret;
+
+	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
+	if (!sgt)
+		return ERR_PTR(-ENOMEM);
+
+	ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
+				    mtk_gem->dma_addr, obj->size,
+				    &mtk_gem->dma_attrs);
+	if (ret) {
+		DRM_ERROR("failed to allocate sgt, %d\n", ret);
+		kfree(sgt);
+		return ERR_PTR(ret);
+	}
+
+	return sgt;
+}
+
+struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
+			struct dma_buf_attachment *attach, struct sg_table *sg)
+{
+	struct mtk_drm_gem_obj *mtk_gem;
+	int ret;
+	struct scatterlist *s;
+	unsigned int i;
+	dma_addr_t expected;
+
+	mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
+
+	if (IS_ERR(mtk_gem))
+		return ERR_PTR(PTR_ERR(mtk_gem));
+
+	expected = sg_dma_address(sg->sgl);
+	for_each_sg(sg->sgl, s, sg->nents, i) {
+		if (sg_dma_address(s) != expected) {
+			DRM_ERROR("sg_table is not contiguous");
+			ret = -EINVAL;
+			goto err_gem_free;
+		}
+		expected = sg_dma_address(s) + sg_dma_len(s);
+	}
+
+	mtk_gem->dma_addr = sg_dma_address(sg->sgl);
+	mtk_gem->sg = sg;
+
+	return &mtk_gem->base;
+
+err_gem_free:
+	kfree(mtk_gem);
+	return ERR_PTR(ret);
+}