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/fb.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11
  12 #include <drm/drm_crtc_helper.h>
  13 #include <drm/drm_drv.h>
  14 #include <drm/drm_fb_helper.h>
  15 #include <drm/drm_fourcc.h>
  16
  17 #include "armada_crtc.h"
  18 #include "armada_drm.h"
  19 #include "armada_fb.h"
  20 #include "armada_gem.h"
  21
  22 static void armada_fbdev_fb_destroy(struct fb_info *info)
  23 {
  24         struct drm_fb_helper *fbh = info->par;
  25
  26         drm_fb_helper_fini(fbh);
  27
  28         fbh->fb->funcs->destroy(fbh->fb);
  29
  30         drm_client_release(&fbh->client);
  31         drm_fb_helper_unprepare(fbh);
  32         kfree(fbh);
  33 }
  34
  35 static const struct fb_ops armada_fb_ops = {
  36         .owner          = THIS_MODULE,
  37         FB_DEFAULT_IOMEM_OPS,
  38         DRM_FB_HELPER_DEFAULT_OPS,
  39         .fb_destroy     = armada_fbdev_fb_destroy,
  40 };
  41
  42 static const struct drm_fb_helper_funcs armada_fbdev_helper_funcs;
  43
  44 int armada_fbdev_driver_fbdev_probe(struct drm_fb_helper *fbh,
  45                                     struct drm_fb_helper_surface_size *sizes)
  46 {
  47         struct drm_device *dev = fbh->dev;
  48         struct drm_mode_fb_cmd2 mode;
  49         struct armada_framebuffer *dfb;
  50         struct armada_gem_object *obj;
  51         struct fb_info *info;
  52         int size, ret;
  53         void *ptr;
  54
  55         memset(&mode, 0, sizeof(mode));
  56         mode.width = sizes->surface_width;
  57         mode.height = sizes->surface_height;
  58         mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
  59         mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  60                                         sizes->surface_depth);
  61
  62         size = mode.pitches[0] * mode.height;
  63         obj = armada_gem_alloc_private_object(dev, size);
  64         if (!obj) {
  65                 DRM_ERROR("failed to allocate fb memory\n");
  66                 return -ENOMEM;
  67         }
  68
  69         ret = armada_gem_linear_back(dev, obj);
  70         if (ret) {
  71                 drm_gem_object_put(&obj->obj);
  72                 return ret;
  73         }
  74
  75         ptr = armada_gem_map_object(dev, obj);
  76         if (!ptr) {
  77                 drm_gem_object_put(&obj->obj);
  78                 return -ENOMEM;
  79         }
  80
  81         dfb = armada_framebuffer_create(dev, &mode, obj);
  82
  83         /*
  84          * A reference is now held by the framebuffer object if
  85          * successful, otherwise this drops the ref for the error path.
  86          */
  87         drm_gem_object_put(&obj->obj);
  88
  89         if (IS_ERR(dfb))
  90                 return PTR_ERR(dfb);
  91
  92         info = drm_fb_helper_alloc_info(fbh);
  93         if (IS_ERR(info)) {
  94                 ret = PTR_ERR(info);
  95                 goto err_fballoc;
  96         }
  97
  98         info->fbops = &armada_fb_ops;
  99         info->fix.smem_start = obj->phys_addr;
 100         info->fix.smem_len = obj->obj.size;
 101         info->screen_size = obj->obj.size;
 102         info->screen_base = ptr;
 103         fbh->funcs = &armada_fbdev_helper_funcs;
 104         fbh->fb = &dfb->fb;
 105
 106         drm_fb_helper_fill_info(info, fbh, sizes);
 107
 108         DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
 109                 dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
 110                 (unsigned long long)obj->phys_addr);
 111
 112         return 0;
 113
 114  err_fballoc:
 115         dfb->fb.funcs->destroy(&dfb->fb);
 116         return ret;
 117 }