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