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_gem.h" 13 #include "msm_kms.h" 14 15 extern int msm_gem_mmap_obj(struct drm_gem_object *obj, 16 struct vm_area_struct *vma); 17 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma); 18 19 /* 20 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 21 */ 22 23 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base) 24 25 struct msm_fbdev { 26 struct drm_fb_helper base; 27 struct drm_framebuffer *fb; 28 }; 29 30 static const struct fb_ops msm_fb_ops = { 31 .owner = THIS_MODULE, 32 DRM_FB_HELPER_DEFAULT_OPS, 33 34 /* Note: to properly handle manual update displays, we wrap the 35 * basic fbdev ops which write to the framebuffer 36 */ 37 .fb_read = drm_fb_helper_sys_read, 38 .fb_write = drm_fb_helper_sys_write, 39 .fb_fillrect = drm_fb_helper_sys_fillrect, 40 .fb_copyarea = drm_fb_helper_sys_copyarea, 41 .fb_imageblit = drm_fb_helper_sys_imageblit, 42 .fb_mmap = msm_fbdev_mmap, 43 }; 44 45 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) 46 { 47 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; 48 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 49 struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0); 50 int ret = 0; 51 52 ret = drm_gem_mmap_obj(bo, bo->size, vma); 53 if (ret) { 54 pr_err("%s:drm_gem_mmap_obj fail\n", __func__); 55 return ret; 56 } 57 58 return msm_gem_mmap_obj(bo, vma); 59 } 60 61 static int msm_fbdev_create(struct drm_fb_helper *helper, 62 struct drm_fb_helper_surface_size *sizes) 63 { 64 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 65 struct drm_device *dev = helper->dev; 66 struct msm_drm_private *priv = dev->dev_private; 67 struct drm_framebuffer *fb = NULL; 68 struct drm_gem_object *bo; 69 struct fb_info *fbi = NULL; 70 uint64_t paddr; 71 uint32_t format; 72 int ret, pitch; 73 74 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth); 75 76 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 77 sizes->surface_height, sizes->surface_bpp, 78 sizes->fb_width, sizes->fb_height); 79 80 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp); 81 fb = msm_alloc_stolen_fb(dev, sizes->surface_width, 82 sizes->surface_height, pitch, format); 83 84 if (IS_ERR(fb)) { 85 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n"); 86 return PTR_ERR(fb); 87 } 88 89 bo = msm_framebuffer_bo(fb, 0); 90 91 mutex_lock(&dev->struct_mutex); 92 93 /* 94 * NOTE: if we can be guaranteed to be able to map buffer 95 * in panic (ie. lock-safe, etc) we could avoid pinning the 96 * buffer now: 97 */ 98 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr); 99 if (ret) { 100 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret); 101 goto fail_unlock; 102 } 103 104 fbi = drm_fb_helper_alloc_fbi(helper); 105 if (IS_ERR(fbi)) { 106 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n"); 107 ret = PTR_ERR(fbi); 108 goto fail_unlock; 109 } 110 111 DBG("fbi=%p, dev=%p", fbi, dev); 112 113 fbdev->fb = fb; 114 helper->fb = fb; 115 116 fbi->fbops = &msm_fb_ops; 117 118 drm_fb_helper_fill_info(fbi, helper, sizes); 119 120 dev->mode_config.fb_base = paddr; 121 122 fbi->screen_base = msm_gem_get_vaddr(bo); 123 if (IS_ERR(fbi->screen_base)) { 124 ret = PTR_ERR(fbi->screen_base); 125 goto fail_unlock; 126 } 127 fbi->screen_size = bo->size; 128 fbi->fix.smem_start = paddr; 129 fbi->fix.smem_len = bo->size; 130 131 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 132 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 133 134 mutex_unlock(&dev->struct_mutex); 135 136 return 0; 137 138 fail_unlock: 139 mutex_unlock(&dev->struct_mutex); 140 drm_framebuffer_remove(fb); 141 return ret; 142 } 143 144 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 145 .fb_probe = msm_fbdev_create, 146 }; 147 148 /* initialize fbdev helper */ 149 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 150 { 151 struct msm_drm_private *priv = dev->dev_private; 152 struct msm_fbdev *fbdev = NULL; 153 struct drm_fb_helper *helper; 154 int ret; 155 156 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 157 if (!fbdev) 158 goto fail; 159 160 helper = &fbdev->base; 161 162 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 163 164 ret = drm_fb_helper_init(dev, helper); 165 if (ret) { 166 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret); 167 goto fail; 168 } 169 170 /* the fw fb could be anywhere in memory */ 171 drm_fb_helper_remove_conflicting_framebuffers(NULL, "msm", false); 172 173 ret = drm_fb_helper_initial_config(helper, 32); 174 if (ret) 175 goto fini; 176 177 priv->fbdev = helper; 178 179 return helper; 180 181 fini: 182 drm_fb_helper_fini(helper); 183 fail: 184 kfree(fbdev); 185 return NULL; 186 } 187 188 void msm_fbdev_free(struct drm_device *dev) 189 { 190 struct msm_drm_private *priv = dev->dev_private; 191 struct drm_fb_helper *helper = priv->fbdev; 192 struct msm_fbdev *fbdev; 193 194 DBG(); 195 196 drm_fb_helper_unregister_fbi(helper); 197 198 drm_fb_helper_fini(helper); 199 200 fbdev = to_msm_fbdev(priv->fbdev); 201 202 /* this will free the backing object */ 203 if (fbdev->fb) { 204 struct drm_gem_object *bo = 205 msm_framebuffer_bo(fbdev->fb, 0); 206 msm_gem_put_vaddr(bo); 207 drm_framebuffer_remove(fbdev->fb); 208 } 209 210 kfree(fbdev); 211 212 priv->fbdev = NULL; 213 } 214