drivers/gpu/drm/armada/armada_fbdev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Russell King
   4  *  Written from the i915 driver.
   5  */
   6 #include <linux/errno.h>
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9
  10 #include <drm/drm_fb_helper.h>
  11 #include "armada_crtc.h"
  12 #include "armada_drm.h"
  13 #include "armada_fb.h"
  14 #include "armada_gem.h"
  15
  16 static /*const*/ struct fb_ops armada_fb_ops = {
  17         .owner          = THIS_MODULE,
  18         DRM_FB_HELPER_DEFAULT_OPS,
  19         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  20         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  21         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  22 };
  23
  24 static int armada_fbdev_create(struct drm_fb_helper *fbh,
  25         struct drm_fb_helper_surface_size *sizes)
  26 {
  27         struct drm_device *dev = fbh->dev;
  28         struct drm_mode_fb_cmd2 mode;
  29         struct armada_framebuffer *dfb;
  30         struct armada_gem_object *obj;
  31         struct fb_info *info;
  32         int size, ret;
  33         void *ptr;
  34
  35         memset(&mode, 0, sizeof(mode));
  36         mode.width = sizes->surface_width;
  37         mode.height = sizes->surface_height;
  38         mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
  39         mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  40                                         sizes->surface_depth);
  41
  42         size = mode.pitches[0] * mode.height;
  43         obj = armada_gem_alloc_private_object(dev, size);
  44         if (!obj) {
  45                 DRM_ERROR("failed to allocate fb memory\n");
  46                 return -ENOMEM;
  47         }
  48
  49         ret = armada_gem_linear_back(dev, obj);
  50         if (ret) {
  51                 drm_gem_object_put_unlocked(&obj->obj);
  52                 return ret;
  53         }
  54
  55         ptr = armada_gem_map_object(dev, obj);
  56         if (!ptr) {
  57                 drm_gem_object_put_unlocked(&obj->obj);
  58                 return -ENOMEM;
  59         }
  60
  61         dfb = armada_framebuffer_create(dev, &mode, obj);
  62
  63         /*
  64          * A reference is now held by the framebuffer object if
  65          * successful, otherwise this drops the ref for the error path.
  66          */
  67         drm_gem_object_put_unlocked(&obj->obj);
  68
  69         if (IS_ERR(dfb))
  70                 return PTR_ERR(dfb);
  71
  72         info = drm_fb_helper_alloc_fbi(fbh);
  73         if (IS_ERR(info)) {
  74                 ret = PTR_ERR(info);
  75                 goto err_fballoc;
  76         }
  77
  78         info->fbops = &armada_fb_ops;
  79         info->fix.smem_start = obj->phys_addr;
  80         info->fix.smem_len = obj->obj.size;
  81         info->screen_size = obj->obj.size;
  82         info->screen_base = ptr;
  83         fbh->fb = &dfb->fb;
  84
  85         drm_fb_helper_fill_info(info, fbh, sizes);
  86
  87         DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
  88                 dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
  89                 (unsigned long long)obj->phys_addr);
  90
  91         return 0;
  92
  93  err_fballoc:
  94         dfb->fb.funcs->destroy(&dfb->fb);
  95         return ret;
  96 }
  97
  98 static int armada_fb_probe(struct drm_fb_helper *fbh,
  99         struct drm_fb_helper_surface_size *sizes)
 100 {
 101         int ret = 0;
 102
 103         if (!fbh->fb) {
 104                 ret = armada_fbdev_create(fbh, sizes);
 105                 if (ret == 0)
 106                         ret = 1;
 107         }
 108         return ret;
 109 }
 110
 111 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
 112         .fb_probe       = armada_fb_probe,
 113 };
 114
 115 int armada_fbdev_init(struct drm_device *dev)
 116 {
 117         struct armada_private *priv = dev->dev_private;
 118         struct drm_fb_helper *fbh;
 119         int ret;
 120
 121         fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL);
 122         if (!fbh)
 123                 return -ENOMEM;
 124
 125         priv->fbdev = fbh;
 126
 127         drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs);
 128
 129         ret = drm_fb_helper_init(dev, fbh, 1);
 130         if (ret) {
 131                 DRM_ERROR("failed to initialize drm fb helper\n");
 132                 goto err_fb_helper;
 133         }
 134
 135         ret = drm_fb_helper_single_add_all_connectors(fbh);
 136         if (ret) {
 137                 DRM_ERROR("failed to add fb connectors\n");
 138                 goto err_fb_setup;
 139         }
 140
 141         ret = drm_fb_helper_initial_config(fbh, 32);
 142         if (ret) {
 143                 DRM_ERROR("failed to set initial config\n");
 144                 goto err_fb_setup;
 145         }
 146
 147         return 0;
 148  err_fb_setup:
 149         drm_fb_helper_fini(fbh);
 150  err_fb_helper:
 151         priv->fbdev = NULL;
 152         return ret;
 153 }
 154
 155 void armada_fbdev_fini(struct drm_device *dev)
 156 {
 157         struct armada_private *priv = dev->dev_private;
 158         struct drm_fb_helper *fbh = priv->fbdev;
 159
 160         if (fbh) {
 161                 drm_fb_helper_unregister_fbi(fbh);
 162
 163                 drm_fb_helper_fini(fbh);
 164
 165                 if (fbh->fb)
 166                         fbh->fb->funcs->destroy(fbh->fb);
 167
 168                 priv->fbdev = NULL;
 169         }
 170 }