// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012 Russell King
* Written from the i915 driver.
*/
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include "armada_crtc.h"
#include "armada_drm.h"
#include "armada_fb.h"
#include "armada_gem.h"
static void armada_fbdev_fb_destroy(struct fb_info *info)
{
struct drm_fb_helper *fbh = info->par;
drm_fb_helper_fini(fbh);
fbh->fb->funcs->destroy(fbh->fb);
drm_client_release(&fbh->client);
drm_fb_helper_unprepare(fbh);
kfree(fbh);
}
static const struct fb_ops armada_fb_ops = {
.owner = THIS_MODULE,
FB_DEFAULT_IOMEM_OPS,
DRM_FB_HELPER_DEFAULT_OPS,
.fb_destroy = armada_fbdev_fb_destroy,
};
static int armada_fbdev_create(struct drm_fb_helper *fbh,
struct drm_fb_helper_surface_size *sizes)
{
struct drm_device *dev = fbh->dev;
struct drm_mode_fb_cmd2 mode;
struct armada_framebuffer *dfb;
struct armada_gem_object *obj;
struct fb_info *info;
int size, ret;
void *ptr;
memset(&mode, 0, sizeof(mode));
mode.width = sizes->surface_width;
mode.height = sizes->surface_height;
mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
sizes->surface_depth);
size = mode.pitches[0] * mode.height;
obj = armada_gem_alloc_private_object(dev, size);
if (!obj) {
DRM_ERROR("failed to allocate fb memory\n");
return -ENOMEM;
}
ret = armada_gem_linear_back(dev, obj);
if (ret) {
drm_gem_object_put(&obj->obj);
return ret;
}
ptr = armada_gem_map_object(dev, obj);
if (!ptr) {
drm_gem_object_put(&obj->obj);
return -ENOMEM;
}
dfb = armada_framebuffer_create(dev, &mode, obj);
/*
* A reference is now held by the framebuffer object if
* successful, otherwise this drops the ref for the error path.
*/
drm_gem_object_put(&obj->obj);
if (IS_ERR(dfb))
return PTR_ERR(dfb);
info = drm_fb_helper_alloc_info(fbh);
if (IS_ERR(info)) {
ret = PTR_ERR(info);
goto err_fballoc;
}
info->fbops = &armada_fb_ops;
info->fix.smem_start = obj->phys_addr;
info->fix.smem_len = obj->obj.size;
info->screen_size = obj->obj.size;
info->screen_base = ptr;
fbh->fb = &dfb->fb;
drm_fb_helper_fill_info(info, fbh, sizes);
DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
(unsigned long long)obj->phys_addr);
return 0;
err_fballoc:
dfb->fb.funcs->destroy(&dfb->fb);
return ret;
}
static int armada_fb_probe(struct drm_fb_helper *fbh,
struct drm_fb_helper_surface_size *sizes)
{
int ret = 0;
if (!fbh->fb) {
ret = armada_fbdev_create(fbh, sizes);
if (ret == 0)
ret = 1;
}
return ret;
}
static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
.fb_probe = armada_fb_probe,
};
/*
* Fbdev client and struct drm_client_funcs
*/
static void armada_fbdev_client_unregister(struct drm_client_dev *client)
{
struct drm_fb_helper *fbh = drm_fb_helper_from_client(client);
if (fbh->info) {
drm_fb_helper_unregister_info(fbh);
} else {
drm_client_release(&fbh->client);
drm_fb_helper_unprepare(fbh);
kfree(fbh);
}
}
static int armada_fbdev_client_restore(struct drm_client_dev *client)
{
drm_fb_helper_lastclose(client->dev);
return 0;
}
static int armada_fbdev_client_hotplug(struct drm_client_dev *client)
{
struct drm_fb_helper *fbh = drm_fb_helper_from_client(client);
struct drm_device *dev = client->dev;
int ret;
if (dev->fb_helper)
return drm_fb_helper_hotplug_event(dev->fb_helper);
ret = drm_fb_helper_init(dev, fbh);
if (ret)
goto err_drm_err;
if (!drm_drv_uses_atomic_modeset(dev))
drm_helper_disable_unused_functions(dev);
ret = drm_fb_helper_initial_config(fbh);
if (ret)
goto err_drm_fb_helper_fini;
return 0;
err_drm_fb_helper_fini:
drm_fb_helper_fini(fbh);
err_drm_err:
drm_err(dev, "armada: Failed to setup fbdev emulation (ret=%d)\n", ret);
return ret;
}
static const struct drm_client_funcs armada_fbdev_client_funcs = {
.owner = THIS_MODULE,
.unregister = armada_fbdev_client_unregister,
.restore = armada_fbdev_client_restore,
.hotplug = armada_fbdev_client_hotplug,
};
void armada_fbdev_setup(struct drm_device *dev)
{
struct drm_fb_helper *fbh;
int ret;
drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
fbh = kzalloc(sizeof(*fbh), GFP_KERNEL);
if (!fbh)
return;
drm_fb_helper_prepare(dev, fbh, 32, &armada_fb_helper_funcs);
ret = drm_client_init(dev, &fbh->client, "fbdev", &armada_fbdev_client_funcs);
if (ret) {
drm_err(dev, "Failed to register client: %d\n", ret);
goto err_drm_client_init;
}
drm_client_register(&fbh->client);
return;
err_drm_client_init:
drm_fb_helper_unprepare(fbh);
kfree(fbh);
return;
}
Codebase Browser
linux