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