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 const struct drm_fb_helper_funcs armada_fbdev_helper_funcs;
 43
 44int armada_fbdev_driver_fbdev_probe(struct drm_fb_helper *fbh,
 45				    struct drm_fb_helper_surface_size *sizes)
 46{
 47	struct drm_device *dev = fbh->dev;
 48	struct drm_mode_fb_cmd2 mode;
 49	struct armada_framebuffer *dfb;
 50	struct armada_gem_object *obj;
 51	struct fb_info *info;
 52	int size, ret;
 53	void *ptr;
 54
 55	memset(&mode, 0, sizeof(mode));
 56	mode.width = sizes->surface_width;
 57	mode.height = sizes->surface_height;
 58	mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
 59	mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 60					sizes->surface_depth);
 61
 62	size = mode.pitches[0] * mode.height;
 63	obj = armada_gem_alloc_private_object(dev, size);
 64	if (!obj) {
 65		DRM_ERROR("failed to allocate fb memory\n");
 66		return -ENOMEM;
 67	}
 68
 69	ret = armada_gem_linear_back(dev, obj);
 70	if (ret) {
 71		drm_gem_object_put(&obj->obj);
 72		return ret;
 73	}
 74
 75	ptr = armada_gem_map_object(dev, obj);
 76	if (!ptr) {
 77		drm_gem_object_put(&obj->obj);
 78		return -ENOMEM;
 79	}
 80
 81	dfb = armada_framebuffer_create(dev, &mode, obj);
 82
 83	/*
 84	 * A reference is now held by the framebuffer object if
 85	 * successful, otherwise this drops the ref for the error path.
 86	 */
 87	drm_gem_object_put(&obj->obj);
 88
 89	if (IS_ERR(dfb))
 90		return PTR_ERR(dfb);
 91
 92	info = drm_fb_helper_alloc_info(fbh);
 93	if (IS_ERR(info)) {
 94		ret = PTR_ERR(info);
 95		goto err_fballoc;
 96	}
 97
 98	info->fbops = &armada_fb_ops;
 99	info->fix.smem_start = obj->phys_addr;
100	info->fix.smem_len = obj->obj.size;
101	info->screen_size = obj->obj.size;
102	info->screen_base = ptr;
103	fbh->funcs = &armada_fbdev_helper_funcs;
104	fbh->fb = &dfb->fb;
105
106	drm_fb_helper_fill_info(info, fbh, sizes);
107
108	DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
109		dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
110		(unsigned long long)obj->phys_addr);
111
112	return 0;
113
114 err_fballoc:
115	dfb->fb.funcs->destroy(&dfb->fb);
116	return ret;
117}