1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2012 Russell King
  4 */
  5
  6#include <drm/drm_modeset_helper.h>
  7#include <drm/drm_fourcc.h>
  8#include <drm/drm_gem_framebuffer_helper.h>
  9
 10#include "armada_drm.h"
 11#include "armada_fb.h"
 12#include "armada_gem.h"
 13#include "armada_hw.h"
 14
 15static const struct drm_framebuffer_funcs armada_fb_funcs = {
 16	.destroy	= drm_gem_fb_destroy,
 17	.create_handle	= drm_gem_fb_create_handle,
 18};
 19
 20struct armada_framebuffer *armada_framebuffer_create(struct drm_device *dev,
 21	const struct drm_mode_fb_cmd2 *mode, struct armada_gem_object *obj)
 22{
 23	struct armada_framebuffer *dfb;
 24	uint8_t format, config;
 25	int ret;
 26
 27	switch (mode->pixel_format) {
 28#define FMT(drm, fmt, mod)		\
 29	case DRM_FORMAT_##drm:		\
 30		format = CFG_##fmt;	\
 31		config = mod;		\
 32		break
 33	FMT(RGB565,	565,		CFG_SWAPRB);
 34	FMT(BGR565,	565,		0);
 35	FMT(ARGB1555,	1555,		CFG_SWAPRB);
 36	FMT(ABGR1555,	1555,		0);
 37	FMT(RGB888,	888PACK,	CFG_SWAPRB);
 38	FMT(BGR888,	888PACK,	0);
 39	FMT(XRGB8888,	X888,		CFG_SWAPRB);
 40	FMT(XBGR8888,	X888,		0);
 41	FMT(ARGB8888,	8888,		CFG_SWAPRB);
 42	FMT(ABGR8888,	8888,		0);
 43	FMT(YUYV,	422PACK,	CFG_YUV2RGB | CFG_SWAPYU | CFG_SWAPUV);
 44	FMT(UYVY,	422PACK,	CFG_YUV2RGB);
 45	FMT(VYUY,	422PACK,	CFG_YUV2RGB | CFG_SWAPUV);
 46	FMT(YVYU,	422PACK,	CFG_YUV2RGB | CFG_SWAPYU);
 47	FMT(YUV422,	422,		CFG_YUV2RGB);
 48	FMT(YVU422,	422,		CFG_YUV2RGB | CFG_SWAPUV);
 49	FMT(YUV420,	420,		CFG_YUV2RGB);
 50	FMT(YVU420,	420,		CFG_YUV2RGB | CFG_SWAPUV);
 51	FMT(C8,		PSEUDO8,	0);
 52#undef FMT
 53	default:
 54		return ERR_PTR(-EINVAL);
 55	}
 56
 57	dfb = kzalloc(sizeof(*dfb), GFP_KERNEL);
 58	if (!dfb) {
 59		DRM_ERROR("failed to allocate Armada fb object\n");
 60		return ERR_PTR(-ENOMEM);
 61	}
 62
 63	dfb->fmt = format;
 64	dfb->mod = config;
 65	dfb->fb.obj[0] = &obj->obj;
 66
 67	drm_helper_mode_fill_fb_struct(dev, &dfb->fb, mode);
 68
 69	ret = drm_framebuffer_init(dev, &dfb->fb, &armada_fb_funcs);
 70	if (ret) {
 71		kfree(dfb);
 72		return ERR_PTR(ret);
 73	}
 74
 75	/*
 76	 * Take a reference on our object as we're successful - the
 77	 * caller already holds a reference, which keeps us safe for
 78	 * the above call, but the caller will drop their reference
 79	 * to it.  Hence we need to take our own reference.
 80	 */
 81	drm_gem_object_get(&obj->obj);
 82
 83	return dfb;
 84}
 85
 86struct drm_framebuffer *armada_fb_create(struct drm_device *dev,
 87	struct drm_file *dfile, const struct drm_mode_fb_cmd2 *mode)
 88{
 89	const struct drm_format_info *info = drm_get_format_info(dev, mode);
 90	struct armada_gem_object *obj;
 91	struct armada_framebuffer *dfb;
 92	int ret;
 93
 94	DRM_DEBUG_DRIVER("w%u h%u pf%08x f%u p%u,%u,%u\n",
 95		mode->width, mode->height, mode->pixel_format,
 96		mode->flags, mode->pitches[0], mode->pitches[1],
 97		mode->pitches[2]);
 98
 99	/* We can only handle a single plane at the moment */
100	if (info->num_planes > 1 &&
101	    (mode->handles[0] != mode->handles[1] ||
102	     mode->handles[0] != mode->handles[2])) {
103		ret = -EINVAL;
104		goto err;
105	}
106
107	obj = armada_gem_object_lookup(dfile, mode->handles[0]);
108	if (!obj) {
109		ret = -ENOENT;
110		goto err;
111	}
112
113	if (obj->obj.import_attach && !obj->sgt) {
114		ret = armada_gem_map_import(obj);
115		if (ret)
116			goto err_unref;
117	}
118
119	/* Framebuffer objects must have a valid device address for scanout */
120	if (!obj->mapped) {
121		ret = -EINVAL;
122		goto err_unref;
123	}
124
125	dfb = armada_framebuffer_create(dev, mode, obj);
126	if (IS_ERR(dfb)) {
127		ret = PTR_ERR(dfb);
128		goto err;
129	}
130
131	drm_gem_object_put(&obj->obj);
132
133	return &dfb->fb;
134
135 err_unref:
136	drm_gem_object_put(&obj->obj);
137 err:
138	DRM_ERROR("failed to initialize framebuffer: %d\n", ret);
139	return ERR_PTR(ret);
140}