kernel/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    = drm_fb_helper_cfb_fillrect,
  26         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  27         .fb_imageblit   = drm_fb_helper_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 = drm_fb_helper_alloc_fbi(fbh);
  84         if (IS_ERR(info)) {
  85                 ret = PTR_ERR(info);
  86                 goto err_fballoc;
  87         }
  88
  89         strlcpy(info->fix.id, "armada-drmfb", sizeof(info->fix.id));
  90         info->par = fbh;
  91         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
  92         info->fbops = &armada_fb_ops;
  93         info->fix.smem_start = obj->phys_addr;
  94         info->fix.smem_len = obj->obj.size;
  95         info->screen_size = obj->obj.size;
  96         info->screen_base = ptr;
  97         fbh->fb = &dfb->fb;
  98
  99         drm_fb_helper_fill_fix(info, dfb->fb.pitches[0], dfb->fb.depth);
 100         drm_fb_helper_fill_var(info, fbh, sizes->fb_width, sizes->fb_height);
 101
 102         DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
 103                 dfb->fb.width, dfb->fb.height, dfb->fb.bits_per_pixel,
 104                 (unsigned long long)obj->phys_addr);
 105
 106         return 0;
 107
 108  err_fballoc:
 109         dfb->fb.funcs->destroy(&dfb->fb);
 110         return ret;
 111 }
 112
 113 static int armada_fb_probe(struct drm_fb_helper *fbh,
 114         struct drm_fb_helper_surface_size *sizes)
 115 {
 116         int ret = 0;
 117
 118         if (!fbh->fb) {
 119                 ret = armada_fb_create(fbh, sizes);
 120                 if (ret == 0)
 121                         ret = 1;
 122         }
 123         return ret;
 124 }
 125
 126 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
 127         .gamma_set      = armada_drm_crtc_gamma_set,
 128         .gamma_get      = armada_drm_crtc_gamma_get,
 129         .fb_probe       = armada_fb_probe,
 130 };
 131
 132 int armada_fbdev_init(struct drm_device *dev)
 133 {
 134         struct armada_private *priv = dev->dev_private;
 135         struct drm_fb_helper *fbh;
 136         int ret;
 137
 138         fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL);
 139         if (!fbh)
 140                 return -ENOMEM;
 141
 142         priv->fbdev = fbh;
 143
 144         drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs);
 145
 146         ret = drm_fb_helper_init(dev, fbh, 1, 1);
 147         if (ret) {
 148                 DRM_ERROR("failed to initialize drm fb helper\n");
 149                 goto err_fb_helper;
 150         }
 151
 152         ret = drm_fb_helper_single_add_all_connectors(fbh);
 153         if (ret) {
 154                 DRM_ERROR("failed to add fb connectors\n");
 155                 goto err_fb_setup;
 156         }
 157
 158         ret = drm_fb_helper_initial_config(fbh, 32);
 159         if (ret) {
 160                 DRM_ERROR("failed to set initial config\n");
 161                 goto err_fb_setup;
 162         }
 163
 164         return 0;
 165  err_fb_setup:
 166         drm_fb_helper_release_fbi(fbh);
 167         drm_fb_helper_fini(fbh);
 168  err_fb_helper:
 169         priv->fbdev = NULL;
 170         return ret;
 171 }
 172
 173 void armada_fbdev_lastclose(struct drm_device *dev)
 174 {
 175         struct armada_private *priv = dev->dev_private;
 176
 177         if (priv->fbdev)
 178                 drm_fb_helper_restore_fbdev_mode_unlocked(priv->fbdev);
 179 }
 180
 181 void armada_fbdev_fini(struct drm_device *dev)
 182 {
 183         struct armada_private *priv = dev->dev_private;
 184         struct drm_fb_helper *fbh = priv->fbdev;
 185
 186         if (fbh) {
 187                 drm_fb_helper_unregister_fbi(fbh);
 188                 drm_fb_helper_release_fbi(fbh);
 189
 190                 drm_fb_helper_fini(fbh);
 191
 192                 if (fbh->fb)
 193                         fbh->fb->funcs->destroy(fbh->fb);
 194
 195                 priv->fbdev = NULL;
 196         }
 197 }