[PATCH 03/10] drm: xlnx: Add xlnx fb of Xilinx DRM KMS

[Hyun Kwon <hyun.kwon-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>]

Helpers for framebuffers backed by cma allocator.

Signed-off-by: Hyun Kwon <hyun.kwon-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
---
 drivers/gpu/drm/xlnx/xlnx_fb.c | 467 +++++++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/xlnx/xlnx_fb.h |  30 +++
 2 files changed, 497 insertions(+)
 create mode 100644 drivers/gpu/drm/xlnx/xlnx_fb.c
 create mode 100644 drivers/gpu/drm/xlnx/xlnx_fb.h

diff --git a/drivers/gpu/drm/xlnx/xlnx_fb.c b/drivers/gpu/drm/xlnx/xlnx_fb.c
new file mode 100644
index 0000000..dbe9fbf
--- /dev/null
+++ b/drivers/gpu/drm/xlnx/xlnx_fb.c
@@ -0,0 +1,467 @@
+/*
+ * Xilinx DRM KMS Framebuffer helper
+ *
+ *  Copyright (C) 2015 - 2018 Xilinx, Inc.
+ *
+ *  Author: Hyun Woo Kwon <hyun.kwon-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
+ *
+ * Based on drm_fb_cma_helper.c
+ *
+ *  Copyright (C) 2012 Analog Device Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+
+#include "xlnx_fb.h"
+
+#define XLNX_MAX_PLANES	4
+
+struct xlnx_fb {
+	struct drm_framebuffer		base;
+	struct drm_gem_cma_object	*obj[XLNX_MAX_PLANES];
+};
+
+struct xlnx_fbdev {
+	struct drm_fb_helper fb_helper;
+	struct xlnx_fb	*fb;
+	unsigned int align;
+	unsigned int vres_mult;
+};
+
+static inline struct xlnx_fbdev *to_fbdev(struct drm_fb_helper *fb_helper)
+{
+	return container_of(fb_helper, struct xlnx_fbdev, fb_helper);
+}
+
+static inline struct xlnx_fb *to_fb(struct drm_framebuffer *base_fb)
+{
+	return container_of(base_fb, struct xlnx_fb, base);
+}
+
+static void xlnx_fb_destroy(struct drm_framebuffer *base_fb)
+{
+	struct xlnx_fb *fb = to_fb(base_fb);
+	int i;
+
+	for (i = 0; i < XLNX_MAX_PLANES; i++)
+		if (fb->obj[i])
+			drm_gem_object_unreference_unlocked(&fb->obj[i]->base);
+
+	drm_framebuffer_cleanup(base_fb);
+	kfree(fb);
+}
+
+static int xlnx_fb_create_handle(struct drm_framebuffer *base_fb,
+				 struct drm_file *file_priv,
+				 unsigned int *handle)
+{
+	struct xlnx_fb *fb = to_fb(base_fb);
+
+	return drm_gem_handle_create(file_priv, &fb->obj[0]->base, handle);
+}
+
+static struct drm_framebuffer_funcs xlnx_fb_funcs = {
+	.destroy	= xlnx_fb_destroy,
+	.create_handle	= xlnx_fb_create_handle,
+};
+
+/**
+ * xlnx_fb_alloc - Allocate a xlnx_fb
+ * @drm: DRM object
+ * @mode_cmd: drm_mode_fb_cmd2 struct
+ * @obj: pointers for returned drm_gem_cma_objects
+ * @num_planes: number of planes to be allocated
+ *
+ * This function is based on drm_fb_cma_alloc().
+ *
+ * Return: a xlnx_fb object, or ERR_PTR.
+ */
+static struct xlnx_fb *
+xlnx_fb_alloc(struct drm_device *drm,
+	      const struct drm_mode_fb_cmd2 *mode_cmd,
+	      struct drm_gem_cma_object **obj, unsigned int num_planes)
+{
+	struct xlnx_fb *fb;
+	int ret;
+	int i;
+
+	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
+	if (!fb)
+		return ERR_PTR(-ENOMEM);
+
+	drm_helper_mode_fill_fb_struct(drm, &fb->base, mode_cmd);
+
+	for (i = 0; i < num_planes; i++)
+		fb->obj[i] = obj[i];
+
+	ret = drm_framebuffer_init(drm, &fb->base, &xlnx_fb_funcs);
+	if (ret) {
+		dev_err(drm->dev, "Failed to initialize fb: %d\n", ret);
+		kfree(fb);
+		return ERR_PTR(ret);
+	}
+
+	return fb;
+}
+
+/**
+ * xlnx_fb_get_paddr - Get physycal address of framebuffer
+ * @base_fb: the framebuffer
+ * @plane: which plane
+ *
+ * This function is based on drm_fb_cma_get_gem_obj().
+ *
+ * Return: a physical address of the plane, or 0
+ */
+dma_addr_t
+xlnx_fb_get_paddr(struct drm_framebuffer *base_fb, unsigned int plane)
+{
+	struct xlnx_fb *fb = to_fb(base_fb);
+
+	if (plane >= XLNX_MAX_PLANES)
+		return 0;
+
+	return fb->obj[plane]->paddr;
+}
+EXPORT_SYMBOL_GPL(xlnx_fb_get_paddr);
+
+static int
+xlnx_fb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
+{
+	struct drm_fb_helper *fb_helper = info->par;
+	unsigned int i;
+	int ret = 0;
+
+	switch (cmd) {
+	case FBIO_WAITFORVSYNC:
+		for (i = 0; i < fb_helper->crtc_count; i++) {
+			struct drm_mode_set *mode_set;
+			struct drm_crtc *crtc;
+
+			mode_set = &fb_helper->crtc_info[i].mode_set;
+			crtc = mode_set->crtc;
+			ret = drm_crtc_vblank_get(crtc);
+			if (!ret) {
+				drm_crtc_wait_one_vblank(crtc);
+				drm_crtc_vblank_put(crtc);
+			}
+		}
+		return ret;
+	default:
+		return -ENOTTY;
+	}
+
+	return 0;
+}
+
+static struct fb_ops xlnx_fbdev_ops = {
+	.owner		= THIS_MODULE,
+	.fb_fillrect	= sys_fillrect,
+	.fb_copyarea	= sys_copyarea,
+	.fb_imageblit	= sys_imageblit,
+	.fb_check_var	= drm_fb_helper_check_var,
+	.fb_set_par	= drm_fb_helper_set_par,
+	.fb_blank	= drm_fb_helper_blank,
+	.fb_pan_display	= drm_fb_helper_pan_display,
+	.fb_setcmap	= drm_fb_helper_setcmap,
+	.fb_ioctl	= xlnx_fb_ioctl,
+};
+
+/**
+ * xlnx_fbdev_create - Create the fbdev with a framebuffer
+ * @fb_helper: fb helper structure
+ * @size: framebuffer size info
+ *
+ * This function is based on drm_fbdev_cma_create().
+ *
+ * Return: 0 if successful, or the error code.
+ */
+static int xlnx_fbdev_create(struct drm_fb_helper *fb_helper,
+			     struct drm_fb_helper_surface_size *size)
+{
+	struct xlnx_fbdev *fbdev = to_fbdev(fb_helper);
+	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
+	struct drm_device *drm = fb_helper->dev;
+	struct drm_gem_cma_object *obj;
+	struct drm_framebuffer *base_fb;
+	unsigned int bytes_per_pixel;
+	unsigned long offset;
+	struct fb_info *fbi;
+	size_t bytes;
+	int ret;
+
+	dev_dbg(drm->dev, "surface width(%d), height(%d) and bpp(%d)\n",
+		size->surface_width, size->surface_height, size->surface_bpp);
+
+	bytes_per_pixel = DIV_ROUND_UP(size->surface_bpp, 8);
+
+	mode_cmd.width = size->surface_width;
+	mode_cmd.height = size->surface_height;
+	mode_cmd.pitches[0] = ALIGN(size->surface_width * bytes_per_pixel,
+				    fbdev->align);
+	mode_cmd.pixel_format = xlnx_get_format(drm);
+
+	mode_cmd.height *= fbdev->vres_mult;
+	bytes = mode_cmd.pitches[0] * mode_cmd.height;
+	obj = drm_gem_cma_create(drm, bytes);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
+
+	fbi = framebuffer_alloc(0, drm->dev);
+	if (!fbi) {
+		dev_err(drm->dev, "Failed to allocate framebuffer info.\n");
+		ret = -ENOMEM;
+		goto err_drm_gem_cma_free_object;
+	}
+
+	fbdev->fb = xlnx_fb_alloc(drm, &mode_cmd, &obj, 1);
+	if (IS_ERR(fbdev->fb)) {
+		dev_err(drm->dev, "Failed to allocate DRM framebuffer.\n");
+		ret = PTR_ERR(fbdev->fb);
+		goto err_framebuffer_release;
+	}
+
+	base_fb = &fbdev->fb->base;
+	fb_helper->fb = base_fb;
+	fb_helper->fbdev = fbi;
+	fbi->par = fb_helper;
+	fbi->flags = FBINFO_FLAG_DEFAULT;
+	fbi->fbops = &xlnx_fbdev_ops;
+
+	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
+	if (ret) {
+		dev_err(drm->dev, "Failed to allocate color map.\n");
+		goto err_xlnx_fb_destroy;
+	}
+
+	drm_fb_helper_fill_fix(fbi, base_fb->pitches[0],
+			       base_fb->format->depth);
+	drm_fb_helper_fill_var(fbi, fb_helper, base_fb->width, base_fb->height);
+	fbi->var.yres = base_fb->height / fbdev->vres_mult;
+
+	offset = fbi->var.xoffset * bytes_per_pixel;
+	offset += fbi->var.yoffset * base_fb->pitches[0];
+
+	drm->mode_config.fb_base = (resource_size_t)obj->paddr;
+	fbi->screen_base = (char __iomem *)(obj->vaddr + offset);
+	fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
+	fbi->screen_size = bytes;
+	fbi->fix.smem_len = bytes;
+
+	return 0;
+
+err_xlnx_fb_destroy:
+	drm_framebuffer_unregister_private(base_fb);
+	xlnx_fb_destroy(base_fb);
+err_framebuffer_release:
+	framebuffer_release(fbi);
+err_drm_gem_cma_free_object:
+	drm_gem_cma_free_object(&obj->base);
+	return ret;
+}
+
+static struct drm_fb_helper_funcs xlnx_fb_helper_funcs = {
+	.fb_probe = xlnx_fbdev_create,
+};
+
+/**
+ * xlnx_fb_init - Allocate and initializes the Xilinx framebuffer
+ * @drm: DRM device
+ * @preferred_bpp: preferred bits per pixel for the device
+ * @max_conn_count: maximum number of connectors
+ * @align: alignment value for pitch
+ * @vres_mult: multiplier for virtual resolution
+ *
+ * This function is based on drm_fbdev_cma_init().
+ *
+ * Return: a newly allocated drm_fb_helper struct or a ERR_PTR.
+ */
+struct drm_fb_helper *
+xlnx_fb_init(struct drm_device *drm, int preferred_bpp,
+	     unsigned int max_conn_count, unsigned int align,
+	     unsigned int vres_mult)
+{
+	struct xlnx_fbdev *fbdev;
+	struct drm_fb_helper *fb_helper;
+	int ret;
+
+	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
+	if (!fbdev)
+		return ERR_PTR(-ENOMEM);
+
+	fbdev->vres_mult = vres_mult;
+	fbdev->align = align;
+	fb_helper = &fbdev->fb_helper;
+	drm_fb_helper_prepare(drm, fb_helper, &xlnx_fb_helper_funcs);
+
+	ret = drm_fb_helper_init(drm, fb_helper, max_conn_count);
+	if (ret < 0) {
+		dev_err(drm->dev, "Failed to initialize drm fb helper.\n");
+		goto err_free;
+	}
+
+	ret = drm_fb_helper_single_add_all_connectors(fb_helper);
+	if (ret < 0) {
+		dev_err(drm->dev, "Failed to add connectors.\n");
+		goto err_drm_fb_helper_fini;
+	}
+
+	ret = drm_fb_helper_initial_config(fb_helper, preferred_bpp);
+	if (ret < 0) {
+		dev_err(drm->dev, "Failed to set initial hw configuration.\n");
+		goto err_drm_fb_helper_fini;
+	}
+
+	return fb_helper;
+
+err_drm_fb_helper_fini:
+	drm_fb_helper_fini(fb_helper);
+err_free:
+	kfree(fbdev);
+	return ERR_PTR(ret);
+}
+
+/**
+ * xlnx_fbdev_defio_fini - Free the defio fb
+ * @fbi: fb_info struct
+ *
+ * This function is based on drm_fbdev_cma_defio_fini().
+ */
+static void xlnx_fbdev_defio_fini(struct fb_info *fbi)
+{
+	if (!fbi->fbdefio)
+		return;
+
+	fb_deferred_io_cleanup(fbi);
+	kfree(fbi->fbdefio);
+	kfree(fbi->fbops);
+}
+
+/**
+ * xlnx_fbdev_fini - Free the Xilinx framebuffer
+ * @fb_helper: drm_fb_helper struct
+ *
+ * This function is based on drm_fbdev_cma_fini().
+ */
+void xlnx_fb_fini(struct drm_fb_helper *fb_helper)
+{
+	struct xlnx_fbdev *fbdev = to_fbdev(fb_helper);
+
+	drm_fb_helper_unregister_fbi(&fbdev->fb_helper);
+	if (fbdev->fb_helper.fbdev)
+		xlnx_fbdev_defio_fini(fbdev->fb_helper.fbdev);
+
+	if (fbdev->fb_helper.fb)
+		drm_framebuffer_remove(fbdev->fb_helper.fb);
+
+	drm_fb_helper_fini(&fbdev->fb_helper);
+	kfree(fbdev);
+}
+
+/**
+ * xlnx_fb_restore_mode - Restores initial framebuffer mode
+ * @fb_helper: drm_fb_helper struct, may be NULL
+ *
+ * This function is based on drm_fbdev_cma_restore_mode() and usually called
+ * from the Xilinx DRM drivers lastclose callback.
+ */
+void xlnx_fb_restore_mode(struct drm_fb_helper *fb_helper)
+{
+	if (!fb_helper)
+		return;
+	drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
+}
+
+/**
+ * xlnx_fb_create - (struct drm_mode_config_funcs *)->fb_create callback
+ * @drm: DRM device
+ * @file_priv: drm file private data
+ * @mode_cmd: mode command for fb creation
+ *
+ * This functions creates a drm_framebuffer for given mode @mode_cmd. This
+ * functions is intended to be used for the fb_create callback function of
+ * drm_mode_config_funcs.
+ *
+ * Return: a drm_framebuffer object if successful, or ERR_PTR.
+ */
+struct drm_framebuffer *
+xlnx_fb_create(struct drm_device *drm, struct drm_file *file_priv,
+	       const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	struct xlnx_fb *fb;
+	struct drm_gem_cma_object *objs[XLNX_MAX_PLANES];
+	struct drm_gem_object *obj;
+	const struct drm_format_info *info;
+	struct drm_format_name_buf format_name;
+	int ret;
+	int i;
+
+	info = drm_format_info(mode_cmd->pixel_format);
+	if (!info) {
+		dev_err(drm->dev, "unsupported framebuffer format %s\n",
+			drm_get_format_name(mode_cmd->pixel_format,
+					    &format_name));
+		ret = -EINVAL;
+		goto err_out;
+	}
+
+	for (i = 0; i < info->num_planes; i++) {
+		unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
+		unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
+		unsigned int min_size;
+
+		obj = drm_gem_object_lookup(file_priv,
+					    mode_cmd->handles[i]);
+		if (!obj) {
+			dev_err(drm->dev, "Failed to lookup GEM object\n");
+			ret = -ENXIO;
+			goto err_gem_object_unreference;
+		}
+
+		min_size = (height - 1) * mode_cmd->pitches[i] + width *
+			   info->cpp[i] + mode_cmd->offsets[i];
+
+		if (obj->size < min_size) {
+			drm_gem_object_unreference_unlocked(obj);
+			ret = -EINVAL;
+			goto err_gem_object_unreference;
+		}
+		objs[i] = to_drm_gem_cma_obj(obj);
+	}
+
+	fb = xlnx_fb_alloc(drm, mode_cmd, objs, i);
+	if (IS_ERR(fb)) {
+		ret = PTR_ERR(fb);
+		goto err_gem_object_unreference;
+	}
+
+	fb->base.format = info;
+
+	return &fb->base;
+
+err_gem_object_unreference:
+	for (i--; i >= 0; i--)
+		drm_gem_object_unreference_unlocked(&objs[i]->base);
+err_out:
+	return ERR_PTR(ret);
+}
+
+/**
+ * xlnx_fb_hotplug_event - Poll for hotpulug events
+ * @fb_helper: drm_fb_helper struct, may be NULL
+ *
+ * This function is based on drm_fbdev_cma_hotplug_event() and usually called
+ * from the Xilinx DRM drivers output_poll_changed callback.
+ */
+void xlnx_fb_hotplug_event(struct drm_fb_helper *fb_helper)
+{
+	if (!fb_helper)
+		return;
+	drm_fb_helper_hotplug_event(fb_helper);
+}
diff --git a/drivers/gpu/drm/xlnx/xlnx_fb.h b/drivers/gpu/drm/xlnx/xlnx_fb.h
new file mode 100644
index 0000000..3f7e962
--- /dev/null
+++ b/drivers/gpu/drm/xlnx/xlnx_fb.h
@@ -0,0 +1,30 @@
+/*
+ * Xilinx DRM KMS Framebuffer helper header
+ *
+ *  Copyright (C) 2015 - 2018 Xilinx, Inc.
+ *
+ *  Author: Hyun Woo Kwon <hyun.kwon-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef _XLNX_FB_H_
+#define _XLNX_FB_H_
+
+struct drm_fb_helper;
+
+dma_addr_t
+xlnx_fb_get_paddr(struct drm_framebuffer *base_fb, unsigned int plane);
+
+void xlnx_fb_restore_mode(struct drm_fb_helper *fb_helper);
+struct drm_framebuffer *
+xlnx_fb_create(struct drm_device *drm, struct drm_file *file_priv,
+	       const struct drm_mode_fb_cmd2 *mode_cmd);
+void xlnx_fb_hotplug_event(struct drm_fb_helper *fb_helper);
+struct drm_fb_helper *
+xlnx_fb_init(struct drm_device *drm, int preferred_bpp,
+	     unsigned int max_conn_count, unsigned int align,
+	     unsigned int vres_mult);
+void xlnx_fb_fini(struct drm_fb_helper *fb_helper);
+
+#endif /* _XLNX_FB_H_ */
-- 
2.7.4

--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html