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/fb.h>
  9#include <linux/kernel.h>
 10#include <linux/module.h>
 11
 12#include <drm/drm_crtc_helper.h>
 13#include <drm/drm_drv.h>
 14#include <drm/drm_fb_helper.h>
 15#include <drm/drm_fourcc.h>
 16
 17#include "armada_crtc.h"
 18#include "armada_drm.h"
 19#include "armada_fb.h"
 20#include "armada_gem.h"
 21
 22static void armada_fbdev_fb_destroy(struct fb_info *info)
 23{
 24	struct drm_fb_helper *fbh = info->par;
 25
 26	drm_fb_helper_fini(fbh);
 27
 28	fbh->fb->funcs->destroy(fbh->fb);
 29
 30	drm_client_release(&fbh->client);
 31	drm_fb_helper_unprepare(fbh);
 32	kfree(fbh);
 33}
 34
 35static const struct fb_ops armada_fb_ops = {
 36	.owner		= THIS_MODULE,
 37	FB_DEFAULT_IOMEM_OPS,
 38	DRM_FB_HELPER_DEFAULT_OPS,
 39	.fb_destroy	= armada_fbdev_fb_destroy,
 40};
 41
 42static int armada_fbdev_create(struct drm_fb_helper *fbh,
 43	struct drm_fb_helper_surface_size *sizes)
 44{
 45	struct drm_device *dev = fbh->dev;
 46	struct drm_mode_fb_cmd2 mode;
 47	struct armada_framebuffer *dfb;
 48	struct armada_gem_object *obj;
 49	struct fb_info *info;
 50	int size, ret;
 51	void *ptr;
 52
 53	memset(&mode, 0, sizeof(mode));
 54	mode.width = sizes->surface_width;
 55	mode.height = sizes->surface_height;
 56	mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
 57	mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 58					sizes->surface_depth);
 59
 60	size = mode.pitches[0] * mode.height;
 61	obj = armada_gem_alloc_private_object(dev, size);
 62	if (!obj) {
 63		DRM_ERROR("failed to allocate fb memory\n");
 64		return -ENOMEM;
 65	}
 66
 67	ret = armada_gem_linear_back(dev, obj);
 68	if (ret) {
 69		drm_gem_object_put(&obj->obj);
 70		return ret;
 71	}
 72
 73	ptr = armada_gem_map_object(dev, obj);
 74	if (!ptr) {
 75		drm_gem_object_put(&obj->obj);
 76		return -ENOMEM;
 77	}
 78
 79	dfb = armada_framebuffer_create(dev, &mode, obj);
 80
 81	/*
 82	 * A reference is now held by the framebuffer object if
 83	 * successful, otherwise this drops the ref for the error path.
 84	 */
 85	drm_gem_object_put(&obj->obj);
 86
 87	if (IS_ERR(dfb))
 88		return PTR_ERR(dfb);
 89
 90	info = drm_fb_helper_alloc_info(fbh);
 91	if (IS_ERR(info)) {
 92		ret = PTR_ERR(info);
 93		goto err_fballoc;
 94	}
 95
 96	info->fbops = &armada_fb_ops;
 97	info->fix.smem_start = obj->phys_addr;
 98	info->fix.smem_len = obj->obj.size;
 99	info->screen_size = obj->obj.size;
100	info->screen_base = ptr;
101	fbh->fb = &dfb->fb;
102
103	drm_fb_helper_fill_info(info, fbh, sizes);
104
105	DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
106		dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
107		(unsigned long long)obj->phys_addr);
108
109	return 0;
110
111 err_fballoc:
112	dfb->fb.funcs->destroy(&dfb->fb);
113	return ret;
114}
115
116static int armada_fb_probe(struct drm_fb_helper *fbh,
117	struct drm_fb_helper_surface_size *sizes)
118{
119	int ret = 0;
120
121	if (!fbh->fb) {
122		ret = armada_fbdev_create(fbh, sizes);
123		if (ret == 0)
124			ret = 1;
125	}
126	return ret;
127}
128
129static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
130	.fb_probe	= armada_fb_probe,
131};
132
133/*
134 * Fbdev client and struct drm_client_funcs
135 */
136
137static void armada_fbdev_client_unregister(struct drm_client_dev *client)
138{
139	struct drm_fb_helper *fbh = drm_fb_helper_from_client(client);
140
141	if (fbh->info) {
142		drm_fb_helper_unregister_info(fbh);
143	} else {
144		drm_client_release(&fbh->client);
145		drm_fb_helper_unprepare(fbh);
146		kfree(fbh);
147	}
148}
149
150static int armada_fbdev_client_restore(struct drm_client_dev *client)
151{
152	drm_fb_helper_lastclose(client->dev);
153
154	return 0;
155}
156
157static int armada_fbdev_client_hotplug(struct drm_client_dev *client)
158{
159	struct drm_fb_helper *fbh = drm_fb_helper_from_client(client);
160	struct drm_device *dev = client->dev;
161	int ret;
162
163	if (dev->fb_helper)
164		return drm_fb_helper_hotplug_event(dev->fb_helper);
165
166	ret = drm_fb_helper_init(dev, fbh);
167	if (ret)
168		goto err_drm_err;
169
170	if (!drm_drv_uses_atomic_modeset(dev))
171		drm_helper_disable_unused_functions(dev);
172
173	ret = drm_fb_helper_initial_config(fbh);
174	if (ret)
175		goto err_drm_fb_helper_fini;
176
177	return 0;
178
179err_drm_fb_helper_fini:
180	drm_fb_helper_fini(fbh);
181err_drm_err:
182	drm_err(dev, "armada: Failed to setup fbdev emulation (ret=%d)\n", ret);
183	return ret;
184}
185
186static const struct drm_client_funcs armada_fbdev_client_funcs = {
187	.owner		= THIS_MODULE,
188	.unregister	= armada_fbdev_client_unregister,
189	.restore	= armada_fbdev_client_restore,
190	.hotplug	= armada_fbdev_client_hotplug,
191};
192
193void armada_fbdev_setup(struct drm_device *dev)
194{
195	struct drm_fb_helper *fbh;
196	int ret;
197
198	drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
199	drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
200
201	fbh = kzalloc(sizeof(*fbh), GFP_KERNEL);
202	if (!fbh)
203		return;
204	drm_fb_helper_prepare(dev, fbh, 32, &armada_fb_helper_funcs);
205
206	ret = drm_client_init(dev, &fbh->client, "fbdev", &armada_fbdev_client_funcs);
207	if (ret) {
208		drm_err(dev, "Failed to register client: %d\n", ret);
209		goto err_drm_client_init;
210	}
211
212	drm_client_register(&fbh->client);
213
214	return;
215
216err_drm_client_init:
217	drm_fb_helper_unprepare(fbh);
218	kfree(fbh);
219	return;
220}