1/*
  2 * Copyright (C) 2012 Russell King
  3 *  Written from the i915 driver.
  4 *
  5 * This program is free software; you can redistribute it and/or modify
  6 * it under the terms of the GNU General Public License version 2 as
  7 * published by the Free Software Foundation.
  8 */
  9#include <linux/errno.h>
 10#include <linux/kernel.h>
 11#include <linux/module.h>
 12
 13#include <drm/drm_fb_helper.h>
 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_fb_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_unlocked(&obj->obj);
 55		return ret;
 56	}
 57
 58	ptr = armada_gem_map_object(dev, obj);
 59	if (!ptr) {
 60		drm_gem_object_put_unlocked(&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_unlocked(&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	strlcpy(info->fix.id, "armada-drmfb", sizeof(info->fix.id));
 82	info->par = fbh;
 83	info->fbops = &armada_fb_ops;
 84	info->fix.smem_start = obj->phys_addr;
 85	info->fix.smem_len = obj->obj.size;
 86	info->screen_size = obj->obj.size;
 87	info->screen_base = ptr;
 88	fbh->fb = &dfb->fb;
 89
 90	drm_fb_helper_fill_fix(info, dfb->fb.pitches[0],
 91			       dfb->fb.format->depth);
 92	drm_fb_helper_fill_var(info, fbh, sizes->fb_width, sizes->fb_height);
 93
 94	DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
 95		dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
 96		(unsigned long long)obj->phys_addr);
 97
 98	return 0;
 99
100 err_fballoc:
101	dfb->fb.funcs->destroy(&dfb->fb);
102	return ret;
103}
104
105static int armada_fb_probe(struct drm_fb_helper *fbh,
106	struct drm_fb_helper_surface_size *sizes)
107{
108	int ret = 0;
109
110	if (!fbh->fb) {
111		ret = armada_fb_create(fbh, sizes);
112		if (ret == 0)
113			ret = 1;
114	}
115	return ret;
116}
117
118static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
119	.fb_probe	= armada_fb_probe,
120};
121
122int armada_fbdev_init(struct drm_device *dev)
123{
124	struct armada_private *priv = dev->dev_private;
125	struct drm_fb_helper *fbh;
126	int ret;
127
128	fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL);
129	if (!fbh)
130		return -ENOMEM;
131
132	priv->fbdev = fbh;
133
134	drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs);
135
136	ret = drm_fb_helper_init(dev, fbh, 1);
137	if (ret) {
138		DRM_ERROR("failed to initialize drm fb helper\n");
139		goto err_fb_helper;
140	}
141
142	ret = drm_fb_helper_single_add_all_connectors(fbh);
143	if (ret) {
144		DRM_ERROR("failed to add fb connectors\n");
145		goto err_fb_setup;
146	}
147
148	ret = drm_fb_helper_initial_config(fbh, 32);
149	if (ret) {
150		DRM_ERROR("failed to set initial config\n");
151		goto err_fb_setup;
152	}
153
154	return 0;
155 err_fb_setup:
156	drm_fb_helper_fini(fbh);
157 err_fb_helper:
158	priv->fbdev = NULL;
159	return ret;
160}
161
162void armada_fbdev_fini(struct drm_device *dev)
163{
164	struct armada_private *priv = dev->dev_private;
165	struct drm_fb_helper *fbh = priv->fbdev;
166
167	if (fbh) {
168		drm_fb_helper_unregister_fbi(fbh);
169
170		drm_fb_helper_fini(fbh);
171
172		if (fbh->fb)
173			fbh->fb->funcs->destroy(fbh->fb);
174
175		priv->fbdev = NULL;
176	}
177}