diff options
Diffstat (limited to 'drivers/gpu/drm/armada/armada_fbdev.c')
| -rw-r--r-- | drivers/gpu/drm/armada/armada_fbdev.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/drivers/gpu/drm/armada/armada_fbdev.c b/drivers/gpu/drm/armada/armada_fbdev.c new file mode 100644 index 0000000000..d223176912 --- /dev/null +++ b/drivers/gpu/drm/armada/armada_fbdev.c @@ -0,0 +1,220 @@ +// 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; +} |