armada_fbdev.c

  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#include <drm/drm_print.h>
 17
 18#include "armada_crtc.h"
 19#include "armada_drm.h"
 20#include "armada_fb.h"
 21#include "armada_gem.h"
 22
 23static void armada_fbdev_fb_destroy(struct fb_info *info)
 24{
 25	struct drm_fb_helper *fbh = info->par;
 26
 27	drm_fb_helper_fini(fbh);
 28
 29	fbh->fb->funcs->destroy(fbh->fb);
 30
 31	drm_client_release(&fbh->client);
 32}
 33
 34static const struct fb_ops armada_fb_ops = {
 35	.owner		= THIS_MODULE,
 36	FB_DEFAULT_IOMEM_OPS,
 37	DRM_FB_HELPER_DEFAULT_OPS,
 38	.fb_destroy	= armada_fbdev_fb_destroy,
 39};
 40
 41static const struct drm_fb_helper_funcs armada_fbdev_helper_funcs;
 42
 43int armada_fbdev_driver_fbdev_probe(struct drm_fb_helper *fbh,
 44				    struct drm_fb_helper_surface_size *sizes)
 45{
 46	struct drm_device *dev = fbh->dev;
 47	struct fb_info *info = fbh->info;
 48	struct drm_mode_fb_cmd2 mode;
 49	struct armada_framebuffer *dfb;
 50	struct armada_gem_object *obj;
 51	int size, ret;
 52	void *ptr;
 53
 54	memset(&mode, 0, sizeof(mode));
 55	mode.width = sizes->surface_width;
 56	mode.height = sizes->surface_height;
 57	mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
 58	mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 59					sizes->surface_depth);
 60
 61	size = mode.pitches[0] * mode.height;
 62	obj = armada_gem_alloc_private_object(dev, size);
 63	if (!obj) {
 64		DRM_ERROR("failed to allocate fb memory\n");
 65		return -ENOMEM;
 66	}
 67
 68	ret = armada_gem_linear_back(dev, obj);
 69	if (ret) {
 70		drm_gem_object_put(&obj->obj);
 71		return ret;
 72	}
 73
 74	ptr = armada_gem_map_object(dev, obj);
 75	if (!ptr) {
 76		drm_gem_object_put(&obj->obj);
 77		return -ENOMEM;
 78	}
 79
 80	dfb = armada_framebuffer_create(dev,
 81					drm_get_format_info(dev, mode.pixel_format,
 82							    mode.modifier[0]),
 83					&mode, obj);
 84
 85	/*
 86	 * A reference is now held by the framebuffer object if
 87	 * successful, otherwise this drops the ref for the error path.
 88	 */
 89	drm_gem_object_put(&obj->obj);
 90
 91	if (IS_ERR(dfb))
 92		return PTR_ERR(dfb);
 93
 94	info->fbops = &armada_fb_ops;
 95	info->fix.smem_start = obj->phys_addr;
 96	info->fix.smem_len = obj->obj.size;
 97	info->screen_size = obj->obj.size;
 98	info->screen_base = ptr;
 99	fbh->funcs = &armada_fbdev_helper_funcs;
100	fbh->fb = &dfb->fb;
101
102	drm_fb_helper_fill_info(info, fbh, sizes);
103
104	DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
105		dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
106		(unsigned long long)obj->phys_addr);
107
108	return 0;
109}