drm: rockchip: Add basic drm driver
This patch adds the basic structure of a DRM Driver for Rockchip Socs.
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Reviewed-by: Rob Clark <robdclark@gmail.com>
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
new file mode 100644
index 0000000..bc98a22
--- /dev/null
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -0,0 +1,294 @@
+/*
+ * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
+ * Author:Mark Yao <mark.yao@rock-chips.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/drm.h>
+#include <drm/drmP.h>
+#include <drm/drm_gem.h>
+#include <drm/drm_vma_manager.h>
+
+#include <linux/dma-attrs.h>
+
+#include "rockchip_drm_drv.h"
+#include "rockchip_drm_gem.h"
+
+static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj)
+{
+ struct drm_gem_object *obj = &rk_obj->base;
+ struct drm_device *drm = obj->dev;
+
+ init_dma_attrs(&rk_obj->dma_attrs);
+ dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);
+
+ /* TODO(djkurtz): Use DMA_ATTR_NO_KERNEL_MAPPING except for fbdev */
+ rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
+ &rk_obj->dma_addr, GFP_KERNEL,
+ &rk_obj->dma_attrs);
+ if (IS_ERR(rk_obj->kvaddr)) {
+ int ret = PTR_ERR(rk_obj->kvaddr);
+
+ DRM_ERROR("failed to allocate %#x byte dma buffer, %d",
+ obj->size, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
+{
+ struct drm_gem_object *obj = &rk_obj->base;
+ struct drm_device *drm = obj->dev;
+
+ dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
+ &rk_obj->dma_attrs);
+}
+
+int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
+ struct vm_area_struct *vma)
+{
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+ struct drm_device *drm = obj->dev;
+ unsigned long vm_size;
+
+ vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
+ vm_size = vma->vm_end - vma->vm_start;
+
+ if (vm_size > obj->size)
+ return -EINVAL;
+
+ return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
+ obj->size, &rk_obj->dma_attrs);
+}
+
+/* drm driver mmap file operations */
+int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ struct drm_file *priv = filp->private_data;
+ struct drm_device *dev = priv->minor->dev;
+ struct drm_gem_object *obj;
+ struct drm_vma_offset_node *node;
+ int ret;
+
+ if (drm_device_is_unplugged(dev))
+ return -ENODEV;
+
+ mutex_lock(&dev->struct_mutex);
+
+ node = drm_vma_offset_exact_lookup(dev->vma_offset_manager,
+ vma->vm_pgoff,
+ vma_pages(vma));
+ if (!node) {
+ mutex_unlock(&dev->struct_mutex);
+ DRM_ERROR("failed to find vma node.\n");
+ return -EINVAL;
+ } else if (!drm_vma_node_is_allowed(node, filp)) {
+ mutex_unlock(&dev->struct_mutex);
+ return -EACCES;
+ }
+
+ obj = container_of(node, struct drm_gem_object, vma_node);
+ ret = rockchip_gem_mmap_buf(obj, vma);
+
+ mutex_unlock(&dev->struct_mutex);
+
+ return ret;
+}
+
+struct rockchip_gem_object *
+ rockchip_gem_create_object(struct drm_device *drm, unsigned int size)
+{
+ struct rockchip_gem_object *rk_obj;
+ struct drm_gem_object *obj;
+ int ret;
+
+ size = round_up(size, PAGE_SIZE);
+
+ rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
+ if (!rk_obj)
+ return ERR_PTR(-ENOMEM);
+
+ obj = &rk_obj->base;
+
+ drm_gem_private_object_init(drm, obj, size);
+
+ ret = rockchip_gem_alloc_buf(rk_obj);
+ if (ret)
+ goto err_free_rk_obj;
+
+ return rk_obj;
+
+err_free_rk_obj:
+ kfree(rk_obj);
+ return ERR_PTR(ret);
+}
+
+/*
+ * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
+ * function
+ */
+void rockchip_gem_free_object(struct drm_gem_object *obj)
+{
+ struct rockchip_gem_object *rk_obj;
+
+ drm_gem_free_mmap_offset(obj);
+
+ rk_obj = to_rockchip_obj(obj);
+
+ rockchip_gem_free_buf(rk_obj);
+
+ kfree(rk_obj);
+}
+
+/*
+ * rockchip_gem_create_with_handle - allocate an object with the given
+ * size and create a gem handle on it
+ *
+ * returns a struct rockchip_gem_object* on success or ERR_PTR values
+ * on failure.
+ */
+static struct rockchip_gem_object *
+rockchip_gem_create_with_handle(struct drm_file *file_priv,
+ struct drm_device *drm, unsigned int size,
+ unsigned int *handle)
+{
+ struct rockchip_gem_object *rk_obj;
+ struct drm_gem_object *obj;
+ int ret;
+
+ rk_obj = rockchip_gem_create_object(drm, size);
+ if (IS_ERR(rk_obj))
+ return ERR_CAST(rk_obj);
+
+ obj = &rk_obj->base;
+
+ /*
+ * 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, obj, handle);
+ if (ret)
+ goto err_handle_create;
+
+ /* drop reference from allocate - handle holds it now. */
+ drm_gem_object_unreference_unlocked(obj);
+
+ return rk_obj;
+
+err_handle_create:
+ rockchip_gem_free_object(obj);
+
+ return ERR_PTR(ret);
+}
+
+int rockchip_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;
+
+ mutex_lock(&dev->struct_mutex);
+
+ obj = drm_gem_object_lookup(dev, file_priv, handle);
+ if (!obj) {
+ DRM_ERROR("failed to lookup gem object.\n");
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ 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(obj);
+unlock:
+ mutex_unlock(&dev->struct_mutex);
+ return ret;
+}
+
+/*
+ * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
+ * function
+ *
+ * This aligns the pitch and size arguments to the minimum required. wrap
+ * this into your own function if you need bigger alignment.
+ */
+int rockchip_gem_dumb_create(struct drm_file *file_priv,
+ struct drm_device *dev,
+ struct drm_mode_create_dumb *args)
+{
+ struct rockchip_gem_object *rk_obj;
+ int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+
+ /*
+ * align to 64 bytes since Mali requires it.
+ */
+ min_pitch = ALIGN(min_pitch, 64);
+
+ if (args->pitch < min_pitch)
+ args->pitch = min_pitch;
+
+ if (args->size < args->pitch * args->height)
+ args->size = args->pitch * args->height;
+
+ rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
+ &args->handle);
+
+ return PTR_ERR_OR_ZERO(rk_obj);
+}
+
+/*
+ * 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 *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
+{
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+ struct drm_device *drm = obj->dev;
+ struct sg_table *sgt;
+ int ret;
+
+ sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
+ if (!sgt)
+ return ERR_PTR(-ENOMEM);
+
+ ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
+ rk_obj->dma_addr, obj->size,
+ &rk_obj->dma_attrs);
+ if (ret) {
+ DRM_ERROR("failed to allocate sgt, %d\n", ret);
+ kfree(sgt);
+ return ERR_PTR(ret);
+ }
+
+ return sgt;
+}
+
+void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
+{
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+
+ return rk_obj->kvaddr;
+}
+
+void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
+{
+ /* Nothing to do */
+}