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/fb.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13
  14 #include <drm/drmP.h>
  15 #include <drm/drm_fb_helper.h>
  16 #include "armada_crtc.h"
  17 #include "armada_drm.h"
  18 #include "armada_fb.h"
  19 #include "armada_gem.h"
  20
  21 static /*const*/ struct fb_ops armada_fb_ops = {
  22         .owner          = THIS_MODULE,
  23         .fb_check_var   = drm_fb_helper_check_var,
  24         .fb_set_par     = drm_fb_helper_set_par,
  25         .fb_fillrect    = cfb_fillrect,
  26         .fb_copyarea    = cfb_copyarea,
  27         .fb_imageblit   = cfb_imageblit,
  28         .fb_pan_display = drm_fb_helper_pan_display,
  29         .fb_blank       = drm_fb_helper_blank,
  30         .fb_setcmap     = drm_fb_helper_setcmap,
  31         .fb_debug_enter = drm_fb_helper_debug_enter,
  32         .fb_debug_leave = drm_fb_helper_debug_leave,
  33 };
  34
  35 static int armada_fb_create(struct drm_fb_helper *fbh,
  36         struct drm_fb_helper_surface_size *sizes)
  37 {
  38         struct drm_device *dev = fbh->dev;
  39         struct drm_mode_fb_cmd2 mode;
  40         struct armada_framebuffer *dfb;
  41         struct armada_gem_object *obj;
  42         struct fb_info *info;
  43         int size, ret;
  44         void *ptr;
  45
  46         memset(&mode, 0, sizeof(mode));
  47         mode.width = sizes->surface_width;
  48         mode.height = sizes->surface_height;
  49         mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
  50         mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  51                                         sizes->surface_depth);
  52
  53         size = mode.pitches[0] * mode.height;
  54         obj = armada_gem_alloc_private_object(dev, size);
  55         if (!obj) {
  56                 DRM_ERROR("failed to allocate fb memory\n");
  57                 return -ENOMEM;
  58         }
  59
  60         ret = armada_gem_linear_back(dev, obj);
  61         if (ret) {
  62                 drm_gem_object_unreference_unlocked(&obj->obj);
  63                 return ret;
  64         }
  65
  66         ptr = armada_gem_map_object(dev, obj);
  67         if (!ptr) {
  68                 drm_gem_object_unreference_unlocked(&obj->obj);
  69                 return -ENOMEM;
  70         }
  71
  72         dfb = armada_framebuffer_create(dev, &mode, obj);
  73
  74         /*
  75          * A reference is now held by the framebuffer object if
  76          * successful, otherwise this drops the ref for the error path.
  77          */
  78         drm_gem_object_unreference_unlocked(&obj->obj);
  79
  80         if (IS_ERR(dfb))
  81                 return PTR_ERR(dfb);
  82
  83         info = framebuffer_alloc(0, dev->dev);
  84         if (!info) {
  85                 ret = -ENOMEM;
  86                 goto err_fballoc;
  87         }
  88
  89         ret = fb_alloc_cmap(&info->cmap, 256, 0);
  90         if (ret) {
  91                 ret = -ENOMEM;
  92                 goto err_fbcmap;
  93         }
  94
  95         strlcpy(info->fix.id, "armada-drmfb", sizeof(info->fix.id));
  96         info->par = fbh;
  97         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
  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->fb = &dfb->fb;
 104         fbh->fbdev = info;
 105         drm_fb_helper_fill_fix(info, dfb->fb.pitches[0], dfb->fb.depth);
 106         drm_fb_helper_fill_var(info, fbh, sizes->fb_width, sizes->fb_height);
 107
 108         DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
 109                 dfb->fb.width, dfb->fb.height, dfb->fb.bits_per_pixel,
 110                 (unsigned long long)obj->phys_addr);
 111
 112         return 0;
 113
 114  err_fbcmap:
 115         framebuffer_release(info);
 116  err_fballoc:
 117         dfb->fb.funcs->destroy(&dfb->fb);
 118         return ret;
 119 }
 120
 121 static int armada_fb_probe(struct drm_fb_helper *fbh,
 122         struct drm_fb_helper_surface_size *sizes)
 123 {
 124         int ret = 0;
 125
 126         if (!fbh->fb) {
 127                 ret = armada_fb_create(fbh, sizes);
 128                 if (ret == 0)
 129                         ret = 1;
 130         }
 131         return ret;
 132 }
 133
 134 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
 135         .gamma_set      = armada_drm_crtc_gamma_set,
 136         .gamma_get      = armada_drm_crtc_gamma_get,
 137         .fb_probe       = armada_fb_probe,
 138 };
 139
 140 int armada_fbdev_init(struct drm_device *dev)
 141 {
 142         struct armada_private *priv = dev->dev_private;
 143         struct drm_fb_helper *fbh;
 144         int ret;
 145
 146         fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL);
 147         if (!fbh)
 148                 return -ENOMEM;
 149
 150         priv->fbdev = fbh;
 151
 152         drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs);
 153
 154         ret = drm_fb_helper_init(dev, fbh, 1, 1);
 155         if (ret) {
 156                 DRM_ERROR("failed to initialize drm fb helper\n");
 157                 goto err_fb_helper;
 158         }
 159
 160         ret = drm_fb_helper_single_add_all_connectors(fbh);
 161         if (ret) {
 162                 DRM_ERROR("failed to add fb connectors\n");
 163                 goto err_fb_setup;
 164         }
 165
 166         ret = drm_fb_helper_initial_config(fbh, 32);
 167         if (ret) {
 168                 DRM_ERROR("failed to set initial config\n");
 169                 goto err_fb_setup;
 170         }
 171
 172         return 0;
 173  err_fb_setup:
 174         drm_fb_helper_fini(fbh);
 175  err_fb_helper:
 176         priv->fbdev = NULL;
 177         return ret;
 178 }
 179
 180 void armada_fbdev_lastclose(struct drm_device *dev)
 181 {
 182         struct armada_private *priv = dev->dev_private;
 183
 184         if (priv->fbdev)
 185                 drm_fb_helper_restore_fbdev_mode_unlocked(priv->fbdev);
 186 }
 187
 188 void armada_fbdev_fini(struct drm_device *dev)
 189 {
 190         struct armada_private *priv = dev->dev_private;
 191         struct drm_fb_helper *fbh = priv->fbdev;
 192
 193         if (fbh) {
 194                 struct fb_info *info = fbh->fbdev;
 195
 196                 if (info) {
 197                         unregister_framebuffer(info);
 198                         if (info->cmap.len)
 199                                 fb_dealloc_cmap(&info->cmap);
 200                         framebuffer_release(info);
 201                 }
 202
 203                 drm_fb_helper_fini(fbh);
 204
 205                 if (fbh->fb)
 206                         fbh->fb->funcs->destroy(fbh->fb);
 207
 208                 priv->fbdev = NULL;
 209         }
 210 }