drm/hisilicon/hibmc: Add support for frame buffer

Add support for fbdev and kms fb management.

Signed-off-by: Rongrong Zou <zourongrong@gmail.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Xinliang Liu <xinliang.liu@linaro.org>
Acked-by: Sean Paul <seanpaul@chromium.org>

drivers/gpu/drm/hisilicon/hibmc/Makefile

@@ -1,4 +1,4 @@
 ccflags-y := -Iinclude/drm
-hibmc-drm-y := hibmc_drm_drv.o hibmc_ttm.o
+hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_fbdev.o hibmc_ttm.o
 
 obj-$(CONFIG_DRM_HISI_HIBMC) += hibmc-drm.o

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

@@ -202,6 +202,7 @@ static int hibmc_unload(struct drm_device *dev)
 {
 	struct hibmc_drm_private *priv = dev->dev_private;
 
+	hibmc_fbdev_fini(priv);
 	hibmc_mm_fini(priv);
 	dev->dev_private = NULL;
 	return 0;
@@ -228,6 +229,12 @@ static int hibmc_load(struct drm_device *dev)
 	if (ret)
 		goto err;
 
+	ret = hibmc_fbdev_init(priv);
+	if (ret) {
+		DRM_ERROR("failed to initialize fbdev: %d\n", ret);
+		goto err;
+	}
+
 	return 0;
 
 err:

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h

@@ -20,9 +20,21 @@
 #define HIBMC_DRM_DRV_H
 
 #include <drm/drmP.h>
+#include <drm/drm_fb_helper.h>
 #include <drm/drm_gem.h>
 #include <drm/ttm/ttm_bo_driver.h>
 
+struct hibmc_framebuffer {
+	struct drm_framebuffer fb;
+	struct drm_gem_object *obj;
+};
+
+struct hibmc_fbdev {
+	struct drm_fb_helper helper;
+	struct hibmc_framebuffer *fb;
+	int size;
+};
+
 struct hibmc_drm_private {
 	/* hw */
 	void __iomem   *mmio;
@@ -39,9 +51,13 @@ struct hibmc_drm_private {
 	struct ttm_bo_device bdev;
 	bool initialized;
 
+	/* fbdev */
+	struct hibmc_fbdev *fbdev;
 	bool mm_inited;
 };
 
+#define to_hibmc_framebuffer(x) container_of(x, struct hibmc_framebuffer, fb)
+
 struct hibmc_bo {
 	struct ttm_buffer_object bo;
 	struct ttm_placement placement;
@@ -66,8 +82,16 @@ void hibmc_set_power_mode(struct hibmc_drm_private *priv,
 void hibmc_set_current_gate(struct hibmc_drm_private *priv,
 			    unsigned int gate);
 
+int hibmc_fbdev_init(struct hibmc_drm_private *priv);
+void hibmc_fbdev_fini(struct hibmc_drm_private *priv);
+
 int hibmc_gem_create(struct drm_device *dev, u32 size, bool iskernel,
 		     struct drm_gem_object **obj);
+struct hibmc_framebuffer *
+hibmc_framebuffer_init(struct drm_device *dev,
+		       const struct drm_mode_fb_cmd2 *mode_cmd,
+		       struct drm_gem_object *obj);
+
 int hibmc_mm_init(struct hibmc_drm_private *hibmc);
 void hibmc_mm_fini(struct hibmc_drm_private *hibmc);
 int hibmc_bo_pin(struct hibmc_bo *bo, u32 pl_flag, u64 *gpu_addr);

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_fbdev.c

@@ -0,0 +1,267 @@
+/* Hisilicon Hibmc SoC drm driver
+ *
+ * Based on the bochs drm driver.
+ *
+ * Copyright (c) 2016 Huawei Limited.
+ *
+ * Author:
+ *	Rongrong Zou <zourongrong@huawei.com>
+ *	Rongrong Zou <zourongrong@gmail.com>
+ *	Jianhua Li <lijianhua@huawei.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_helper.h>
+
+#include "hibmc_drm_drv.h"
+
+static int hibmcfb_create_object(
+				struct hibmc_drm_private *priv,
+				const struct drm_mode_fb_cmd2 *mode_cmd,
+				struct drm_gem_object **gobj_p)
+{
+	struct drm_gem_object *gobj;
+	struct drm_device *dev = priv->dev;
+	u32 size;
+	int ret = 0;
+
+	size = mode_cmd->pitches[0] * mode_cmd->height;
+	ret = hibmc_gem_create(dev, size, true, &gobj);
+	if (ret)
+		return ret;
+
+	*gobj_p = gobj;
+	return ret;
+}
+
+static struct fb_ops hibmc_drm_fb_ops = {
+	.owner = THIS_MODULE,
+	.fb_check_var = drm_fb_helper_check_var,
+	.fb_set_par = drm_fb_helper_set_par,
+	.fb_fillrect = drm_fb_helper_sys_fillrect,
+	.fb_copyarea = drm_fb_helper_sys_copyarea,
+	.fb_imageblit = drm_fb_helper_sys_imageblit,
+	.fb_pan_display = drm_fb_helper_pan_display,
+	.fb_blank = drm_fb_helper_blank,
+	.fb_setcmap = drm_fb_helper_setcmap,
+};
+
+static int hibmc_drm_fb_create(struct drm_fb_helper *helper,
+			       struct drm_fb_helper_surface_size *sizes)
+{
+	struct hibmc_fbdev *hi_fbdev =
+		container_of(helper, struct hibmc_fbdev, helper);
+	struct hibmc_drm_private *priv = helper->dev->dev_private;
+	struct fb_info *info;
+	struct drm_mode_fb_cmd2 mode_cmd;
+	struct drm_gem_object *gobj = NULL;
+	int ret = 0;
+	int ret1;
+	size_t size;
+	unsigned int bytes_per_pixel;
+	struct hibmc_bo *bo = NULL;
+
+	DRM_DEBUG_DRIVER("surface width(%d), height(%d) and bpp(%d)\n",
+			 sizes->surface_width, sizes->surface_height,
+			 sizes->surface_bpp);
+	sizes->surface_depth = 32;
+
+	bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
+
+	mode_cmd.width = sizes->surface_width;
+	mode_cmd.height = sizes->surface_height;
+	mode_cmd.pitches[0] = mode_cmd.width * bytes_per_pixel;
+	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
+							  sizes->surface_depth);
+
+	size = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height);
+
+	ret = hibmcfb_create_object(priv, &mode_cmd, &gobj);
+	if (ret) {
+		DRM_ERROR("failed to create fbcon backing object: %d\n", ret);
+		return -ENOMEM;
+	}
+
+	bo = gem_to_hibmc_bo(gobj);
+
+	ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
+	if (ret) {
+		DRM_ERROR("failed to reserve ttm_bo: %d\n", ret);
+		goto out_unref_gem;
+	}
+
+	ret = hibmc_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
+	if (ret) {
+		DRM_ERROR("failed to pin fbcon: %d\n", ret);
+		goto out_unreserve_ttm_bo;
+	}
+
+	ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
+	if (ret) {
+		DRM_ERROR("failed to kmap fbcon: %d\n", ret);
+		goto out_unpin_bo;
+	}
+	ttm_bo_unreserve(&bo->bo);
+
+	info = drm_fb_helper_alloc_fbi(helper);
+	if (IS_ERR(info)) {
+		ret = PTR_ERR(info);
+		DRM_ERROR("failed to allocate fbi: %d\n", ret);
+		goto out_release_fbi;
+	}
+
+	info->par = hi_fbdev;
+
+	hi_fbdev->fb = hibmc_framebuffer_init(priv->dev, &mode_cmd, gobj);
+	if (IS_ERR(hi_fbdev->fb)) {
+		ret = PTR_ERR(info);
+		DRM_ERROR("failed to initialize framebuffer: %d\n", ret);
+		goto out_release_fbi;
+	}
+
+	priv->fbdev->size = size;
+	hi_fbdev->helper.fb = &hi_fbdev->fb->fb;
+
+	strcpy(info->fix.id, "hibmcdrmfb");
+
+	info->flags = FBINFO_DEFAULT;
+	info->fbops = &hibmc_drm_fb_ops;
+
+	drm_fb_helper_fill_fix(info, hi_fbdev->fb->fb.pitches[0],
+			       hi_fbdev->fb->fb.depth);
+	drm_fb_helper_fill_var(info, &priv->fbdev->helper, sizes->fb_width,
+			       sizes->fb_height);
+
+	info->screen_base = bo->kmap.virtual;
+	info->screen_size = size;
+
+	info->fix.smem_start = bo->bo.mem.bus.offset + bo->bo.mem.bus.base;
+	info->fix.smem_len = size;
+	return 0;
+
+out_release_fbi:
+	drm_fb_helper_release_fbi(helper);
+	ret1 = ttm_bo_reserve(&bo->bo, true, false, NULL);
+	if (ret1) {
+		DRM_ERROR("failed to rsv ttm_bo when release fbi: %d\n", ret1);
+		goto out_unref_gem;
+	}
+	ttm_bo_kunmap(&bo->kmap);
+out_unpin_bo:
+	hibmc_bo_unpin(bo);
+out_unreserve_ttm_bo:
+	ttm_bo_unreserve(&bo->bo);
+out_unref_gem:
+	drm_gem_object_unreference_unlocked(gobj);
+
+	return ret;
+}
+
+static void hibmc_fbdev_destroy(struct hibmc_fbdev *fbdev)
+{
+	struct hibmc_framebuffer *gfb = fbdev->fb;
+	struct drm_fb_helper *fbh = &fbdev->helper;
+
+	drm_fb_helper_unregister_fbi(fbh);
+	drm_fb_helper_release_fbi(fbh);
+
+	drm_fb_helper_fini(fbh);
+
+	if (gfb)
+		drm_framebuffer_unreference(&gfb->fb);
+}
+
+static const struct drm_fb_helper_funcs hibmc_fbdev_helper_funcs = {
+	.fb_probe = hibmc_drm_fb_create,
+};
+
+int hibmc_fbdev_init(struct hibmc_drm_private *priv)
+{
+	int ret;
+	struct fb_var_screeninfo *var;
+	struct fb_fix_screeninfo *fix;
+	struct hibmc_fbdev *hifbdev;
+
+	hifbdev = devm_kzalloc(priv->dev->dev, sizeof(*hifbdev), GFP_KERNEL);
+	if (!hifbdev) {
+		DRM_ERROR("failed to allocate hibmc_fbdev\n");
+		return -ENOMEM;
+	}
+
+	priv->fbdev = hifbdev;
+	drm_fb_helper_prepare(priv->dev, &hifbdev->helper,
+			      &hibmc_fbdev_helper_funcs);
+
+	/* Now just one crtc and one channel */
+	ret = drm_fb_helper_init(priv->dev,
+				 &hifbdev->helper, 1, 1);
+	if (ret) {
+		DRM_ERROR("failed to initialize fb helper: %d\n", ret);
+		return ret;
+	}
+
+	ret = drm_fb_helper_single_add_all_connectors(&hifbdev->helper);
+	if (ret) {
+		DRM_ERROR("failed to add all connectors: %d\n", ret);
+		goto fini;
+	}
+
+	ret = drm_fb_helper_initial_config(&hifbdev->helper, 16);
+	if (ret) {
+		DRM_ERROR("failed to setup initial conn config: %d\n", ret);
+		goto fini;
+	}
+
+	var = &hifbdev->helper.fbdev->var;
+	fix = &hifbdev->helper.fbdev->fix;
+
+	DRM_DEBUG_DRIVER("Member of info->var is :\n"
+			 "xres=%d\n"
+			 "yres=%d\n"
+			 "xres_virtual=%d\n"
+			 "yres_virtual=%d\n"
+			 "xoffset=%d\n"
+			 "yoffset=%d\n"
+			 "bits_per_pixel=%d\n"
+			 "...\n", var->xres, var->yres, var->xres_virtual,
+			 var->yres_virtual, var->xoffset, var->yoffset,
+			 var->bits_per_pixel);
+	DRM_DEBUG_DRIVER("Member of info->fix is :\n"
+			 "smem_start=%lx\n"
+			 "smem_len=%d\n"
+			 "type=%d\n"
+			 "type_aux=%d\n"
+			 "visual=%d\n"
+			 "xpanstep=%d\n"
+			 "ypanstep=%d\n"
+			 "ywrapstep=%d\n"
+			 "line_length=%d\n"
+			 "accel=%d\n"
+			 "capabilities=%d\n"
+			 "...\n", fix->smem_start, fix->smem_len, fix->type,
+			 fix->type_aux, fix->visual, fix->xpanstep,
+			 fix->ypanstep, fix->ywrapstep, fix->line_length,
+			 fix->accel, fix->capabilities);
+
+	return 0;
+
+fini:
+	drm_fb_helper_fini(&hifbdev->helper);
+	return ret;
+}
+
+void hibmc_fbdev_fini(struct hibmc_drm_private *priv)
+{
+	if (!priv->fbdev)
+		return;
+
+	hibmc_fbdev_destroy(priv->fbdev);
+	priv->fbdev = NULL;
+}