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_fbi(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 dev->mode_config.fb_base = paddr; 113 114 fbi->screen_base = msm_gem_get_vaddr(bo); 115 if (IS_ERR(fbi->screen_base)) { 116 ret = PTR_ERR(fbi->screen_base); 117 goto fail; 118 } 119 fbi->screen_size = bo->size; 120 fbi->fix.smem_start = paddr; 121 fbi->fix.smem_len = bo->size; 122 123 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 124 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 125 126 return 0; 127 128 fail: 129 drm_framebuffer_remove(fb); 130 return ret; 131 } 132 133 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 134 .fb_probe = msm_fbdev_create, 135 }; 136 137 /* initialize fbdev helper */ 138 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 139 { 140 struct msm_drm_private *priv = dev->dev_private; 141 struct msm_fbdev *fbdev = NULL; 142 struct drm_fb_helper *helper; 143 int ret; 144 145 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 146 if (!fbdev) 147 goto fail; 148 149 helper = &fbdev->base; 150 151 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 152 153 ret = drm_fb_helper_init(dev, helper); 154 if (ret) { 155 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret); 156 goto fail; 157 } 158 159 /* the fw fb could be anywhere in memory */ 160 ret = drm_aperture_remove_framebuffers(false, dev->driver); 161 if (ret) 162 goto fini; 163 164 ret = drm_fb_helper_initial_config(helper, 32); 165 if (ret) 166 goto fini; 167 168 priv->fbdev = helper; 169 170 return helper; 171 172 fini: 173 drm_fb_helper_fini(helper); 174 fail: 175 kfree(fbdev); 176 return NULL; 177 } 178 179 void msm_fbdev_free(struct drm_device *dev) 180 { 181 struct msm_drm_private *priv = dev->dev_private; 182 struct drm_fb_helper *helper = priv->fbdev; 183 struct msm_fbdev *fbdev; 184 185 DBG(); 186 187 drm_fb_helper_unregister_fbi(helper); 188 189 drm_fb_helper_fini(helper); 190 191 fbdev = to_msm_fbdev(priv->fbdev); 192 193 /* this will free the backing object */ 194 if (fbdev->fb) { 195 struct drm_gem_object *bo = 196 msm_framebuffer_bo(fbdev->fb, 0); 197 msm_gem_put_vaddr(bo); 198 drm_framebuffer_remove(fbdev->fb); 199 } 200 201 kfree(fbdev); 202 203 priv->fbdev = NULL; 204 } 205