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 mutex_lock(&dev->struct_mutex); 85 86 /* 87 * NOTE: if we can be guaranteed to be able to map buffer 88 * in panic (ie. lock-safe, etc) we could avoid pinning the 89 * buffer now: 90 */ 91 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr); 92 if (ret) { 93 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret); 94 goto fail_unlock; 95 } 96 97 fbi = drm_fb_helper_alloc_fbi(helper); 98 if (IS_ERR(fbi)) { 99 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n"); 100 ret = PTR_ERR(fbi); 101 goto fail_unlock; 102 } 103 104 DBG("fbi=%p, dev=%p", fbi, dev); 105 106 fbdev->fb = fb; 107 helper->fb = fb; 108 109 fbi->fbops = &msm_fb_ops; 110 111 drm_fb_helper_fill_info(fbi, helper, sizes); 112 113 dev->mode_config.fb_base = paddr; 114 115 fbi->screen_base = msm_gem_get_vaddr(bo); 116 if (IS_ERR(fbi->screen_base)) { 117 ret = PTR_ERR(fbi->screen_base); 118 goto fail_unlock; 119 } 120 fbi->screen_size = bo->size; 121 fbi->fix.smem_start = paddr; 122 fbi->fix.smem_len = bo->size; 123 124 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 125 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 126 127 mutex_unlock(&dev->struct_mutex); 128 129 return 0; 130 131 fail_unlock: 132 mutex_unlock(&dev->struct_mutex); 133 drm_framebuffer_remove(fb); 134 return ret; 135 } 136 137 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 138 .fb_probe = msm_fbdev_create, 139 }; 140 141 /* initialize fbdev helper */ 142 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 143 { 144 struct msm_drm_private *priv = dev->dev_private; 145 struct msm_fbdev *fbdev = NULL; 146 struct drm_fb_helper *helper; 147 int ret; 148 149 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 150 if (!fbdev) 151 goto fail; 152 153 helper = &fbdev->base; 154 155 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 156 157 ret = drm_fb_helper_init(dev, helper); 158 if (ret) { 159 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret); 160 goto fail; 161 } 162 163 /* the fw fb could be anywhere in memory */ 164 ret = drm_aperture_remove_framebuffers(false, dev->driver); 165 if (ret) 166 goto fini; 167 168 ret = drm_fb_helper_initial_config(helper, 32); 169 if (ret) 170 goto fini; 171 172 priv->fbdev = helper; 173 174 return helper; 175 176 fini: 177 drm_fb_helper_fini(helper); 178 fail: 179 kfree(fbdev); 180 return NULL; 181 } 182 183 void msm_fbdev_free(struct drm_device *dev) 184 { 185 struct msm_drm_private *priv = dev->dev_private; 186 struct drm_fb_helper *helper = priv->fbdev; 187 struct msm_fbdev *fbdev; 188 189 DBG(); 190 191 drm_fb_helper_unregister_fbi(helper); 192 193 drm_fb_helper_fini(helper); 194 195 fbdev = to_msm_fbdev(priv->fbdev); 196 197 /* this will free the backing object */ 198 if (fbdev->fb) { 199 struct drm_gem_object *bo = 200 msm_framebuffer_bo(fbdev->fb, 0); 201 msm_gem_put_vaddr(bo); 202 drm_framebuffer_remove(fbdev->fb); 203 } 204 205 kfree(fbdev); 206 207 priv->fbdev = NULL; 208 } 209