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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2012-2013 Avionic Design GmbH4 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.5 *6 * Based on the KMS/FB DMA helpers7 * Copyright (C) 2012 Analog Devices Inc.8 */9 10#include <linux/console.h>11#include <linux/fb.h>12#include <linux/vmalloc.h>13 14#include <drm/drm_drv.h>15#include <drm/drm_crtc_helper.h>16#include <drm/drm_fb_helper.h>17#include <drm/drm_fourcc.h>18#include <drm/drm_framebuffer.h>19#include <drm/drm_gem_framebuffer_helper.h>20#include <drm/drm_modeset_helper.h>21 22#include "drm.h"23#include "gem.h"24 25static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)26{27 struct drm_fb_helper *helper = info->par;28 struct tegra_bo *bo;29 int err;30 31 bo = tegra_fb_get_plane(helper->fb, 0);32 33 err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma);34 if (err < 0)35 return err;36 37 return __tegra_gem_mmap(&bo->gem, vma);38}39 40static void tegra_fbdev_fb_destroy(struct fb_info *info)41{42 struct drm_fb_helper *helper = info->par;43 struct drm_framebuffer *fb = helper->fb;44 struct tegra_bo *bo = tegra_fb_get_plane(fb, 0);45 46 drm_fb_helper_fini(helper);47 48 /* Undo the special mapping we made in fbdev probe. */49 if (bo->pages) {50 vunmap(bo->vaddr);51 bo->vaddr = NULL;52 }53 drm_framebuffer_remove(fb);54 55 drm_client_release(&helper->client);56 drm_fb_helper_unprepare(helper);57 kfree(helper);58}59 60static const struct fb_ops tegra_fb_ops = {61 .owner = THIS_MODULE,62 __FB_DEFAULT_DMAMEM_OPS_RDWR,63 DRM_FB_HELPER_DEFAULT_OPS,64 __FB_DEFAULT_DMAMEM_OPS_DRAW,65 .fb_mmap = tegra_fb_mmap,66 .fb_destroy = tegra_fbdev_fb_destroy,67};68 69static int tegra_fbdev_probe(struct drm_fb_helper *helper,70 struct drm_fb_helper_surface_size *sizes)71{72 struct tegra_drm *tegra = helper->dev->dev_private;73 struct drm_device *drm = helper->dev;74 struct drm_mode_fb_cmd2 cmd = { 0 };75 unsigned int bytes_per_pixel;76 struct drm_framebuffer *fb;77 unsigned long offset;78 struct fb_info *info;79 struct tegra_bo *bo;80 size_t size;81 int err;82 83 bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);84 85 cmd.width = sizes->surface_width;86 cmd.height = sizes->surface_height;87 cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,88 tegra->pitch_align);89 90 cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,91 sizes->surface_depth);92 93 size = cmd.pitches[0] * cmd.height;94 95 bo = tegra_bo_create(drm, size, 0);96 if (IS_ERR(bo))97 return PTR_ERR(bo);98 99 info = drm_fb_helper_alloc_info(helper);100 if (IS_ERR(info)) {101 dev_err(drm->dev, "failed to allocate framebuffer info\n");102 drm_gem_object_put(&bo->gem);103 return PTR_ERR(info);104 }105 106 fb = tegra_fb_alloc(drm, &cmd, &bo, 1);107 if (IS_ERR(fb)) {108 err = PTR_ERR(fb);109 dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n",110 err);111 drm_gem_object_put(&bo->gem);112 return PTR_ERR(fb);113 }114 115 helper->fb = fb;116 helper->info = info;117 118 info->fbops = &tegra_fb_ops;119 120 drm_fb_helper_fill_info(info, helper, sizes);121 122 offset = info->var.xoffset * bytes_per_pixel +123 info->var.yoffset * fb->pitches[0];124 125 if (bo->pages) {126 bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,127 pgprot_writecombine(PAGE_KERNEL));128 if (!bo->vaddr) {129 dev_err(drm->dev, "failed to vmap() framebuffer\n");130 err = -ENOMEM;131 goto destroy;132 }133 }134 135 info->flags |= FBINFO_VIRTFB;136 info->screen_buffer = bo->vaddr + offset;137 info->screen_size = size;138 info->fix.smem_start = (unsigned long)(bo->iova + offset);139 info->fix.smem_len = size;140 141 return 0;142 143destroy:144 drm_framebuffer_remove(fb);145 return err;146}147 148static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {149 .fb_probe = tegra_fbdev_probe,150};151 152/*153 * struct drm_client154 */155 156static void tegra_fbdev_client_unregister(struct drm_client_dev *client)157{158 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);159 160 if (fb_helper->info) {161 drm_fb_helper_unregister_info(fb_helper);162 } else {163 drm_client_release(&fb_helper->client);164 drm_fb_helper_unprepare(fb_helper);165 kfree(fb_helper);166 }167}168 169static int tegra_fbdev_client_restore(struct drm_client_dev *client)170{171 drm_fb_helper_lastclose(client->dev);172 173 return 0;174}175 176static int tegra_fbdev_client_hotplug(struct drm_client_dev *client)177{178 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);179 struct drm_device *dev = client->dev;180 int ret;181 182 if (dev->fb_helper)183 return drm_fb_helper_hotplug_event(dev->fb_helper);184 185 ret = drm_fb_helper_init(dev, fb_helper);186 if (ret)187 goto err_drm_err;188 189 if (!drm_drv_uses_atomic_modeset(dev))190 drm_helper_disable_unused_functions(dev);191 192 ret = drm_fb_helper_initial_config(fb_helper);193 if (ret)194 goto err_drm_fb_helper_fini;195 196 return 0;197 198err_drm_fb_helper_fini:199 drm_fb_helper_fini(fb_helper);200err_drm_err:201 drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret);202 return ret;203}204 205static const struct drm_client_funcs tegra_fbdev_client_funcs = {206 .owner = THIS_MODULE,207 .unregister = tegra_fbdev_client_unregister,208 .restore = tegra_fbdev_client_restore,209 .hotplug = tegra_fbdev_client_hotplug,210};211 212void tegra_fbdev_setup(struct drm_device *dev)213{214 struct drm_fb_helper *helper;215 int ret;216 217 drm_WARN(dev, !dev->registered, "Device has not been registered.\n");218 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");219 220 helper = kzalloc(sizeof(*helper), GFP_KERNEL);221 if (!helper)222 return;223 drm_fb_helper_prepare(dev, helper, 32, &tegra_fb_helper_funcs);224 225 ret = drm_client_init(dev, &helper->client, "fbdev", &tegra_fbdev_client_funcs);226 if (ret)227 goto err_drm_client_init;228 229 drm_client_register(&helper->client);230 231 return;232 233err_drm_client_init:234 drm_fb_helper_unprepare(helper);235 kfree(helper);236}237