1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2012 Russell King
  4 *  Written from the i915 driver.
  5 */
  6
  7#include <linux/errno.h>
  8#include <linux/kernel.h>
  9#include <linux/module.h>
 10
 11#include <drm/drm_fb_helper.h>
 12#include <drm/drm_fourcc.h>
 13
 14#include "armada_crtc.h"
 15#include "armada_drm.h"
 16#include "armada_fb.h"
 17#include "armada_gem.h"
 18
 19static const struct fb_ops armada_fb_ops = {
 20	.owner		= THIS_MODULE,
 21	DRM_FB_HELPER_DEFAULT_OPS,
 22	.fb_fillrect	= drm_fb_helper_cfb_fillrect,
 23	.fb_copyarea	= drm_fb_helper_cfb_copyarea,
 24	.fb_imageblit	= drm_fb_helper_cfb_imageblit,
 25};
 26
 27static int armada_fbdev_create(struct drm_fb_helper *fbh,
 28	struct drm_fb_helper_surface_size *sizes)
 29{
 30	struct drm_device *dev = fbh->dev;
 31	struct drm_mode_fb_cmd2 mode;
 32	struct armada_framebuffer *dfb;
 33	struct armada_gem_object *obj;
 34	struct fb_info *info;
 35	int size, ret;
 36	void *ptr;
 37
 38	memset(&mode, 0, sizeof(mode));
 39	mode.width = sizes->surface_width;
 40	mode.height = sizes->surface_height;
 41	mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
 42	mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 43					sizes->surface_depth);
 44
 45	size = mode.pitches[0] * mode.height;
 46	obj = armada_gem_alloc_private_object(dev, size);
 47	if (!obj) {
 48		DRM_ERROR("failed to allocate fb memory\n");
 49		return -ENOMEM;
 50	}
 51
 52	ret = armada_gem_linear_back(dev, obj);
 53	if (ret) {
 54		drm_gem_object_put(&obj->obj);
 55		return ret;
 56	}
 57
 58	ptr = armada_gem_map_object(dev, obj);
 59	if (!ptr) {
 60		drm_gem_object_put(&obj->obj);
 61		return -ENOMEM;
 62	}
 63
 64	dfb = armada_framebuffer_create(dev, &mode, obj);
 65
 66	/*
 67	 * A reference is now held by the framebuffer object if
 68	 * successful, otherwise this drops the ref for the error path.
 69	 */
 70	drm_gem_object_put(&obj->obj);
 71
 72	if (IS_ERR(dfb))
 73		return PTR_ERR(dfb);
 74
 75	info = drm_fb_helper_alloc_fbi(fbh);
 76	if (IS_ERR(info)) {
 77		ret = PTR_ERR(info);
 78		goto err_fballoc;
 79	}
 80
 81	info->fbops = &armada_fb_ops;
 82	info->fix.smem_start = obj->phys_addr;
 83	info->fix.smem_len = obj->obj.size;
 84	info->screen_size = obj->obj.size;
 85	info->screen_base = ptr;
 86	fbh->fb = &dfb->fb;
 87
 88	drm_fb_helper_fill_info(info, fbh, sizes);
 89
 90	DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
 91		dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
 92		(unsigned long long)obj->phys_addr);
 93
 94	return 0;
 95
 96 err_fballoc:
 97	dfb->fb.funcs->destroy(&dfb->fb);
 98	return ret;
 99}
100
101static int armada_fb_probe(struct drm_fb_helper *fbh,
102	struct drm_fb_helper_surface_size *sizes)
103{
104	int ret = 0;
105
106	if (!fbh->fb) {
107		ret = armada_fbdev_create(fbh, sizes);
108		if (ret == 0)
109			ret = 1;
110	}
111	return ret;
112}
113
114static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
115	.fb_probe	= armada_fb_probe,
116};
117
118int armada_fbdev_init(struct drm_device *dev)
119{
120	struct armada_private *priv = drm_to_armada_dev(dev);
121	struct drm_fb_helper *fbh;
122	int ret;
123
124	fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL);
125	if (!fbh)
126		return -ENOMEM;
127
128	priv->fbdev = fbh;
129
130	drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs);
131
132	ret = drm_fb_helper_init(dev, fbh);
133	if (ret) {
134		DRM_ERROR("failed to initialize drm fb helper\n");
135		goto err_fb_helper;
136	}
137
138	ret = drm_fb_helper_initial_config(fbh, 32);
139	if (ret) {
140		DRM_ERROR("failed to set initial config\n");
141		goto err_fb_setup;
142	}
143
144	return 0;
145 err_fb_setup:
146	drm_fb_helper_fini(fbh);
147 err_fb_helper:
148	priv->fbdev = NULL;
149	return ret;
150}
151
152void armada_fbdev_fini(struct drm_device *dev)
153{
154	struct armada_private *priv = drm_to_armada_dev(dev);
155	struct drm_fb_helper *fbh = priv->fbdev;
156
157	if (fbh) {
158		drm_fb_helper_unregister_fbi(fbh);
159
160		drm_fb_helper_fini(fbh);
161
162		if (fbh->fb)
163			fbh->fb->funcs->destroy(fbh->fb);
164
165		priv->fbdev = NULL;
166	}
167}