drivers/gpu/drm/armada/armada_fbdev.c

   1 /*
   2  * Copyright (C) 2012 Russell King
   3  *  Written from the i915 driver.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9 #include <linux/errno.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12
  13 #include <drm/drmP.h>
  14 #include <drm/drm_fb_helper.h>
  15 #include "armada_crtc.h"
  16 #include "armada_drm.h"
  17 #include "armada_fb.h"
  18 #include "armada_gem.h"
  19
  20 static /*const*/ struct fb_ops armada_fb_ops = {
  21         .owner          = THIS_MODULE,
  22         DRM_FB_HELPER_DEFAULT_OPS,
  23         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  24         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  25         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  26 };
  27
  28 static int armada_fb_create(struct drm_fb_helper *fbh,
  29         struct drm_fb_helper_surface_size *sizes)
  30 {
  31         struct drm_device *dev = fbh->dev;
  32         struct drm_mode_fb_cmd2 mode;
  33         struct armada_framebuffer *dfb;
  34         struct armada_gem_object *obj;
  35         struct fb_info *info;
  36         int size, ret;
  37         void *ptr;
  38
  39         memset(&mode, 0, sizeof(mode));
  40         mode.width = sizes->surface_width;
  41         mode.height = sizes->surface_height;
  42         mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
  43         mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  44                                         sizes->surface_depth);
  45
  46         size = mode.pitches[0] * mode.height;
  47         obj = armada_gem_alloc_private_object(dev, size);
  48         if (!obj) {
  49                 DRM_ERROR("failed to allocate fb memory\n");
  50                 return -ENOMEM;
  51         }
  52
  53         ret = armada_gem_linear_back(dev, obj);
  54         if (ret) {
  55                 drm_gem_object_unreference_unlocked(&obj->obj);
  56                 return ret;
  57         }
  58
  59         ptr = armada_gem_map_object(dev, obj);
  60         if (!ptr) {
  61                 drm_gem_object_unreference_unlocked(&obj->obj);
  62                 return -ENOMEM;
  63         }
  64
  65         dfb = armada_framebuffer_create(dev, &mode, obj);
  66
  67         /*
  68          * A reference is now held by the framebuffer object if
  69          * successful, otherwise this drops the ref for the error path.
  70          */
  71         drm_gem_object_unreference_unlocked(&obj->obj);
  72
  73         if (IS_ERR(dfb))
  74                 return PTR_ERR(dfb);
  75
  76         info = drm_fb_helper_alloc_fbi(fbh);
  77         if (IS_ERR(info)) {
  78                 ret = PTR_ERR(info);
  79                 goto err_fballoc;
  80         }
  81
  82         strlcpy(info->fix.id, "armada-drmfb", sizeof(info->fix.id));
  83         info->par = fbh;
  84         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
  85         info->fbops = &armada_fb_ops;
  86         info->fix.smem_start = obj->phys_addr;
  87         info->fix.smem_len = obj->obj.size;
  88         info->screen_size = obj->obj.size;
  89         info->screen_base = ptr;
  90         fbh->fb = &dfb->fb;
  91
  92         drm_fb_helper_fill_fix(info, dfb->fb.pitches[0],
  93                                dfb->fb.format->depth);
  94         drm_fb_helper_fill_var(info, fbh, sizes->fb_width, sizes->fb_height);
  95
  96         DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
  97                 dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
  98                 (unsigned long long)obj->phys_addr);
  99
 100         return 0;
 101
 102  err_fballoc:
 103         dfb->fb.funcs->destroy(&dfb->fb);
 104         return ret;
 105 }
 106
 107 static int armada_fb_probe(struct drm_fb_helper *fbh,
 108         struct drm_fb_helper_surface_size *sizes)
 109 {
 110         int ret = 0;
 111
 112         if (!fbh->fb) {
 113                 ret = armada_fb_create(fbh, sizes);
 114                 if (ret == 0)
 115                         ret = 1;
 116         }
 117         return ret;
 118 }
 119
 120 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
 121         .gamma_set      = armada_drm_crtc_gamma_set,
 122         .gamma_get      = armada_drm_crtc_gamma_get,
 123         .fb_probe       = armada_fb_probe,
 124 };
 125
 126 int armada_fbdev_init(struct drm_device *dev)
 127 {
 128         struct armada_private *priv = dev->dev_private;
 129         struct drm_fb_helper *fbh;
 130         int ret;
 131
 132         fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL);
 133         if (!fbh)
 134                 return -ENOMEM;
 135
 136         priv->fbdev = fbh;
 137
 138         drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs);
 139
 140         ret = drm_fb_helper_init(dev, fbh, 1);
 141         if (ret) {
 142                 DRM_ERROR("failed to initialize drm fb helper\n");
 143                 goto err_fb_helper;
 144         }
 145
 146         ret = drm_fb_helper_single_add_all_connectors(fbh);
 147         if (ret) {
 148                 DRM_ERROR("failed to add fb connectors\n");
 149                 goto err_fb_setup;
 150         }
 151
 152         ret = drm_fb_helper_initial_config(fbh, 32);
 153         if (ret) {
 154                 DRM_ERROR("failed to set initial config\n");
 155                 goto err_fb_setup;
 156         }
 157
 158         return 0;
 159  err_fb_setup:
 160         drm_fb_helper_fini(fbh);
 161  err_fb_helper:
 162         priv->fbdev = NULL;
 163         return ret;
 164 }
 165
 166 void armada_fbdev_lastclose(struct drm_device *dev)
 167 {
 168         struct armada_private *priv = dev->dev_private;
 169
 170         if (priv->fbdev)
 171                 drm_fb_helper_restore_fbdev_mode_unlocked(priv->fbdev);
 172 }
 173
 174 void armada_fbdev_fini(struct drm_device *dev)
 175 {
 176         struct armada_private *priv = dev->dev_private;
 177         struct drm_fb_helper *fbh = priv->fbdev;
 178
 179         if (fbh) {
 180                 drm_fb_helper_unregister_fbi(fbh);
 181
 182                 drm_fb_helper_fini(fbh);
 183
 184                 if (fbh->fb)
 185                         fbh->fb->funcs->destroy(fbh->fb);
 186
 187                 priv->fbdev = NULL;
 188         }
 189 }