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_prime.h> 12 13 #include "msm_drv.h" 14 #include "msm_gem.h" 15 #include "msm_kms.h" 16 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 51 return drm_gem_prime_mmap(bo, vma); 52 } 53 54 static int msm_fbdev_create(struct drm_fb_helper *helper, 55 struct drm_fb_helper_surface_size *sizes) 56 { 57 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 58 struct drm_device *dev = helper->dev; 59 struct msm_drm_private *priv = dev->dev_private; 60 struct drm_framebuffer *fb = NULL; 61 struct drm_gem_object *bo; 62 struct fb_info *fbi = NULL; 63 uint64_t paddr; 64 uint32_t format; 65 int ret, pitch; 66 67 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth); 68 69 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 70 sizes->surface_height, sizes->surface_bpp, 71 sizes->fb_width, sizes->fb_height); 72 73 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp); 74 fb = msm_alloc_stolen_fb(dev, sizes->surface_width, 75 sizes->surface_height, pitch, format); 76 77 if (IS_ERR(fb)) { 78 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n"); 79 return PTR_ERR(fb); 80 } 81 82 bo = msm_framebuffer_bo(fb, 0); 83 84 /* 85 * NOTE: if we can be guaranteed to be able to map buffer 86 * in panic (ie. lock-safe, etc) we could avoid pinning the 87 * buffer now: 88 */ 89 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr); 90 if (ret) { 91 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret); 92 goto fail; 93 } 94 95 fbi = drm_fb_helper_alloc_fbi(helper); 96 if (IS_ERR(fbi)) { 97 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n"); 98 ret = PTR_ERR(fbi); 99 goto fail; 100 } 101 102 DBG("fbi=%p, dev=%p", fbi, dev); 103 104 fbdev->fb = fb; 105 helper->fb = fb; 106 107 fbi->fbops = &msm_fb_ops; 108 109 drm_fb_helper_fill_info(fbi, helper, sizes); 110 111 dev->mode_config.fb_base = paddr; 112 113 fbi->screen_base = msm_gem_get_vaddr(bo); 114 if (IS_ERR(fbi->screen_base)) { 115 ret = PTR_ERR(fbi->screen_base); 116 goto fail; 117 } 118 fbi->screen_size = bo->size; 119 fbi->fix.smem_start = paddr; 120 fbi->fix.smem_len = bo->size; 121 122 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 123 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 124 125 return 0; 126 127 fail: 128 drm_framebuffer_remove(fb); 129 return ret; 130 } 131 132 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 133 .fb_probe = msm_fbdev_create, 134 }; 135 136 /* initialize fbdev helper */ 137 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 138 { 139 struct msm_drm_private *priv = dev->dev_private; 140 struct msm_fbdev *fbdev = NULL; 141 struct drm_fb_helper *helper; 142 int ret; 143 144 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 145 if (!fbdev) 146 goto fail; 147 148 helper = &fbdev->base; 149 150 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 151 152 ret = drm_fb_helper_init(dev, helper); 153 if (ret) { 154 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret); 155 goto fail; 156 } 157 158 /* the fw fb could be anywhere in memory */ 159 ret = drm_aperture_remove_framebuffers(false, dev->driver); 160 if (ret) 161 goto fini; 162 163 ret = drm_fb_helper_initial_config(helper, 32); 164 if (ret) 165 goto fini; 166 167 priv->fbdev = helper; 168 169 return helper; 170 171 fini: 172 drm_fb_helper_fini(helper); 173 fail: 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_fbi(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 kfree(fbdev); 201 202 priv->fbdev = NULL; 203 } 204