drivers/gpu/drm/msm/msm_fbdev.c

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "msm_drv.h"
  19
  20 #include "drm_crtc.h"
  21 #include "drm_fb_helper.h"
  22
  23 /*
  24  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  25  */
  26
  27 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
  28
  29 struct msm_fbdev {
  30         struct drm_fb_helper base;
  31         struct drm_framebuffer *fb;
  32         struct drm_gem_object *bo;
  33 };
  34
  35 static struct fb_ops msm_fb_ops = {
  36         .owner = THIS_MODULE,
  37
  38         /* Note: to properly handle manual update displays, we wrap the
  39          * basic fbdev ops which write to the framebuffer
  40          */
  41         .fb_read = fb_sys_read,
  42         .fb_write = fb_sys_write,
  43         .fb_fillrect = sys_fillrect,
  44         .fb_copyarea = sys_copyarea,
  45         .fb_imageblit = sys_imageblit,
  46
  47         .fb_check_var = drm_fb_helper_check_var,
  48         .fb_set_par = drm_fb_helper_set_par,
  49         .fb_pan_display = drm_fb_helper_pan_display,
  50         .fb_blank = drm_fb_helper_blank,
  51         .fb_setcmap = drm_fb_helper_setcmap,
  52 };
  53
  54 static int msm_fbdev_create(struct drm_fb_helper *helper,
  55                 struct drm_fb_helper_surface_size *sizes)
  56 {
  57         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  58         struct drm_device *dev = helper->dev;
  59         struct drm_framebuffer *fb = NULL;
  60         struct fb_info *fbi = NULL;
  61         struct drm_mode_fb_cmd2 mode_cmd = {0};
  62         dma_addr_t paddr;
  63         int ret, size;
  64
  65         sizes->surface_bpp = 32;
  66         sizes->surface_depth = 24;
  67
  68         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  69                         sizes->surface_height, sizes->surface_bpp,
  70                         sizes->fb_width, sizes->fb_height);
  71
  72         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  73                         sizes->surface_depth);
  74
  75         mode_cmd.width = sizes->surface_width;
  76         mode_cmd.height = sizes->surface_height;
  77
  78         mode_cmd.pitches[0] = align_pitch(
  79                         mode_cmd.width, sizes->surface_bpp);
  80
  81         /* allocate backing bo */
  82         size = mode_cmd.pitches[0] * mode_cmd.height;
  83         DBG("allocating %d bytes for fb %d", size, dev->primary->index);
  84         mutex_lock(&dev->struct_mutex);
  85         fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
  86         mutex_unlock(&dev->struct_mutex);
  87         if (IS_ERR(fbdev->bo)) {
  88                 ret = PTR_ERR(fbdev->bo);
  89                 fbdev->bo = NULL;
  90                 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
  91                 goto fail;
  92         }
  93
  94         fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
  95         if (IS_ERR(fb)) {
  96                 dev_err(dev->dev, "failed to allocate fb\n");
  97                 /* note: if fb creation failed, we can't rely on fb destroy
  98                  * to unref the bo:
  99                  */
 100                 drm_gem_object_unreference(fbdev->bo);
 101                 ret = PTR_ERR(fb);
 102                 goto fail;
 103         }
 104
 105         mutex_lock(&dev->struct_mutex);
 106
 107         /* TODO implement our own fb_mmap so we don't need this: */
 108         msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
 109
 110         fbi = framebuffer_alloc(0, dev->dev);
 111         if (!fbi) {
 112                 dev_err(dev->dev, "failed to allocate fb info\n");
 113                 ret = -ENOMEM;
 114                 goto fail_unlock;
 115         }
 116
 117         DBG("fbi=%p, dev=%p", fbi, dev);
 118
 119         fbdev->fb = fb;
 120         helper->fb = fb;
 121         helper->fbdev = fbi;
 122
 123         fbi->par = helper;
 124         fbi->flags = FBINFO_DEFAULT;
 125         fbi->fbops = &msm_fb_ops;
 126
 127         strcpy(fbi->fix.id, "msm");
 128
 129         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 130         if (ret) {
 131                 ret = -ENOMEM;
 132                 goto fail_unlock;
 133         }
 134
 135         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
 136         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 137
 138         dev->mode_config.fb_base = paddr;
 139
 140         fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo);
 141         fbi->screen_size = fbdev->bo->size;
 142         fbi->fix.smem_start = paddr;
 143         fbi->fix.smem_len = fbdev->bo->size;
 144
 145         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 146         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 147
 148         mutex_unlock(&dev->struct_mutex);
 149
 150         return 0;
 151
 152 fail_unlock:
 153         mutex_unlock(&dev->struct_mutex);
 154 fail:
 155
 156         if (ret) {
 157                 if (fbi)
 158                         framebuffer_release(fbi);
 159                 if (fb) {
 160                         drm_framebuffer_unregister_private(fb);
 161                         drm_framebuffer_remove(fb);
 162                 }
 163         }
 164
 165         return ret;
 166 }
 167
 168 static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc,
 169                 u16 red, u16 green, u16 blue, int regno)
 170 {
 171         DBG("fbdev: set gamma");
 172 }
 173
 174 static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc,
 175                 u16 *red, u16 *green, u16 *blue, int regno)
 176 {
 177         DBG("fbdev: get gamma");
 178 }
 179
 180 static struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 181         .gamma_set = msm_crtc_fb_gamma_set,
 182         .gamma_get = msm_crtc_fb_gamma_get,
 183         .fb_probe = msm_fbdev_create,
 184 };
 185
 186 /* initialize fbdev helper */
 187 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 188 {
 189         struct msm_drm_private *priv = dev->dev_private;
 190         struct msm_fbdev *fbdev = NULL;
 191         struct drm_fb_helper *helper;
 192         int ret = 0;
 193
 194         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 195         if (!fbdev)
 196                 goto fail;
 197
 198         helper = &fbdev->base;
 199
 200         helper->funcs = &msm_fb_helper_funcs;
 201
 202         ret = drm_fb_helper_init(dev, helper,
 203                         priv->num_crtcs, priv->num_connectors);
 204         if (ret) {
 205                 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
 206                 goto fail;
 207         }
 208
 209         drm_fb_helper_single_add_all_connectors(helper);
 210
 211         /* disable all the possible outputs/crtcs before entering KMS mode */
 212         drm_helper_disable_unused_functions(dev);
 213
 214         drm_fb_helper_initial_config(helper, 32);
 215
 216         priv->fbdev = helper;
 217
 218         return helper;
 219
 220 fail:
 221         kfree(fbdev);
 222         return NULL;
 223 }
 224
 225 void msm_fbdev_free(struct drm_device *dev)
 226 {
 227         struct msm_drm_private *priv = dev->dev_private;
 228         struct drm_fb_helper *helper = priv->fbdev;
 229         struct msm_fbdev *fbdev;
 230         struct fb_info *fbi;
 231
 232         DBG();
 233
 234         fbi = helper->fbdev;
 235
 236         /* only cleanup framebuffer if it is present */
 237         if (fbi) {
 238                 unregister_framebuffer(fbi);
 239                 framebuffer_release(fbi);
 240         }
 241
 242         drm_fb_helper_fini(helper);
 243
 244         fbdev = to_msm_fbdev(priv->fbdev);
 245
 246         /* this will free the backing object */
 247         if (fbdev->fb) {
 248                 drm_framebuffer_unregister_private(fbdev->fb);
 249                 drm_framebuffer_remove(fbdev->fb);
 250         }
 251
 252         kfree(fbdev);
 253
 254         priv->fbdev = NULL;
 255 }