1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2013 Red Hat 4 * Author: Rob Clark <robdclark@gmail.com> 5 */ 6 7 #include <drm/drm_crtc.h> 8 #include <drm/drm_fb_helper.h> 9 #include <drm/drm_fourcc.h> 10 11 #include "msm_drv.h" 12 #include "msm_kms.h" 13 14 extern int msm_gem_mmap_obj(struct drm_gem_object *obj, 15 struct vm_area_struct *vma); 16 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma); 17 18 /* 19 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 20 */ 21 22 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base) 23 24 struct msm_fbdev { 25 struct drm_fb_helper base; 26 struct drm_framebuffer *fb; 27 }; 28 29 static const struct fb_ops msm_fb_ops = { 30 .owner = THIS_MODULE, 31 DRM_FB_HELPER_DEFAULT_OPS, 32 33 /* Note: to properly handle manual update displays, we wrap the 34 * basic fbdev ops which write to the framebuffer 35 */ 36 .fb_read = drm_fb_helper_sys_read, 37 .fb_write = drm_fb_helper_sys_write, 38 .fb_fillrect = drm_fb_helper_sys_fillrect, 39 .fb_copyarea = drm_fb_helper_sys_copyarea, 40 .fb_imageblit = drm_fb_helper_sys_imageblit, 41 .fb_mmap = msm_fbdev_mmap, 42 }; 43 44 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) 45 { 46 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; 47 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 48 struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0); 49 int ret = 0; 50 51 ret = drm_gem_mmap_obj(bo, bo->size, vma); 52 if (ret) { 53 pr_err("%s:drm_gem_mmap_obj fail\n", __func__); 54 return ret; 55 } 56 57 return msm_gem_mmap_obj(bo, vma); 58 } 59 60 static int msm_fbdev_create(struct drm_fb_helper *helper, 61 struct drm_fb_helper_surface_size *sizes) 62 { 63 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 64 struct drm_device *dev = helper->dev; 65 struct msm_drm_private *priv = dev->dev_private; 66 struct drm_framebuffer *fb = NULL; 67 struct drm_gem_object *bo; 68 struct fb_info *fbi = NULL; 69 uint64_t paddr; 70 uint32_t format; 71 int ret, pitch; 72 73 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth); 74 75 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 76 sizes->surface_height, sizes->surface_bpp, 77 sizes->fb_width, sizes->fb_height); 78 79 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp); 80 fb = msm_alloc_stolen_fb(dev, sizes->surface_width, 81 sizes->surface_height, pitch, format); 82 83 if (IS_ERR(fb)) { 84 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n"); 85 return PTR_ERR(fb); 86 } 87 88 bo = msm_framebuffer_bo(fb, 0); 89 90 mutex_lock(&dev->struct_mutex); 91 92 /* 93 * NOTE: if we can be guaranteed to be able to map buffer 94 * in panic (ie. lock-safe, etc) we could avoid pinning the 95 * buffer now: 96 */ 97 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr); 98 if (ret) { 99 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret); 100 goto fail_unlock; 101 } 102 103 fbi = drm_fb_helper_alloc_fbi(helper); 104 if (IS_ERR(fbi)) { 105 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n"); 106 ret = PTR_ERR(fbi); 107 goto fail_unlock; 108 } 109 110 DBG("fbi=%p, dev=%p", fbi, dev); 111 112 fbdev->fb = fb; 113 helper->fb = fb; 114 115 fbi->fbops = &msm_fb_ops; 116 117 drm_fb_helper_fill_info(fbi, helper, sizes); 118 119 dev->mode_config.fb_base = paddr; 120 121 fbi->screen_base = msm_gem_get_vaddr(bo); 122 if (IS_ERR(fbi->screen_base)) { 123 ret = PTR_ERR(fbi->screen_base); 124 goto fail_unlock; 125 } 126 fbi->screen_size = bo->size; 127 fbi->fix.smem_start = paddr; 128 fbi->fix.smem_len = bo->size; 129 130 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 131 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 132 133 mutex_unlock(&dev->struct_mutex); 134 135 return 0; 136 137 fail_unlock: 138 mutex_unlock(&dev->struct_mutex); 139 drm_framebuffer_remove(fb); 140 return ret; 141 } 142 143 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 144 .fb_probe = msm_fbdev_create, 145 }; 146 147 /* initialize fbdev helper */ 148 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 149 { 150 struct msm_drm_private *priv = dev->dev_private; 151 struct msm_fbdev *fbdev = NULL; 152 struct drm_fb_helper *helper; 153 int ret; 154 155 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 156 if (!fbdev) 157 goto fail; 158 159 helper = &fbdev->base; 160 161 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 162 163 ret = drm_fb_helper_init(dev, helper); 164 if (ret) { 165 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret); 166 goto fail; 167 } 168 169 /* the fw fb could be anywhere in memory */ 170 drm_fb_helper_remove_conflicting_framebuffers(NULL, "msm", false); 171 172 ret = drm_fb_helper_initial_config(helper, 32); 173 if (ret) 174 goto fini; 175 176 priv->fbdev = helper; 177 178 return helper; 179 180 fini: 181 drm_fb_helper_fini(helper); 182 fail: 183 kfree(fbdev); 184 return NULL; 185 } 186 187 void msm_fbdev_free(struct drm_device *dev) 188 { 189 struct msm_drm_private *priv = dev->dev_private; 190 struct drm_fb_helper *helper = priv->fbdev; 191 struct msm_fbdev *fbdev; 192 193 DBG(); 194 195 drm_fb_helper_unregister_fbi(helper); 196 197 drm_fb_helper_fini(helper); 198 199 fbdev = to_msm_fbdev(priv->fbdev); 200 201 /* this will free the backing object */ 202 if (fbdev->fb) { 203 struct drm_gem_object *bo = 204 msm_framebuffer_bo(fbdev->fb, 0); 205 msm_gem_put_vaddr(bo); 206 drm_framebuffer_remove(fbdev->fb); 207 } 208 209 kfree(fbdev); 210 211 priv->fbdev = NULL; 212 } 213