drivers/staging/omapdrm/omap_fbdev.c

   1 /*
   2  * drivers/staging/omapdrm/omap_fbdev.c
   3  *
   4  * Copyright (C) 2011 Texas Instruments
   5  * Author: Rob Clark <rob@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "omap_drv.h"
  21
  22 #include "drm_crtc.h"
  23 #include "drm_fb_helper.h"
  24
  25 /*
  26  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  27  */
  28
  29 #define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
  30
  31 struct omap_fbdev {
  32         struct drm_fb_helper base;
  33         struct drm_framebuffer *fb;
  34 };
  35
  36 static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h);
  37
  38 static ssize_t omap_fbdev_write(struct fb_info *fbi, const char __user *buf,
  39                 size_t count, loff_t *ppos)
  40 {
  41         ssize_t res;
  42
  43         res = fb_sys_write(fbi, buf, count, ppos);
  44         omap_fbdev_flush(fbi, 0, 0, fbi->var.xres, fbi->var.yres);
  45
  46         return res;
  47 }
  48
  49 static void omap_fbdev_fillrect(struct fb_info *fbi,
  50                 const struct fb_fillrect *rect)
  51 {
  52         sys_fillrect(fbi, rect);
  53         omap_fbdev_flush(fbi, rect->dx, rect->dy, rect->width, rect->height);
  54 }
  55
  56 static void omap_fbdev_copyarea(struct fb_info *fbi,
  57                 const struct fb_copyarea *area)
  58 {
  59         sys_copyarea(fbi, area);
  60         omap_fbdev_flush(fbi, area->dx, area->dy, area->width, area->height);
  61 }
  62
  63 static void omap_fbdev_imageblit(struct fb_info *fbi,
  64                 const struct fb_image *image)
  65 {
  66         sys_imageblit(fbi, image);
  67         omap_fbdev_flush(fbi, image->dx, image->dy,
  68                                 image->width, image->height);
  69 }
  70
  71 static struct fb_ops omap_fb_ops = {
  72         .owner = THIS_MODULE,
  73
  74         /* Note: to properly handle manual update displays, we wrap the
  75          * basic fbdev ops which write to the framebuffer
  76          */
  77         .fb_read = fb_sys_read,
  78         .fb_write = omap_fbdev_write,
  79         .fb_fillrect = omap_fbdev_fillrect,
  80         .fb_copyarea = omap_fbdev_copyarea,
  81         .fb_imageblit = omap_fbdev_imageblit,
  82
  83         .fb_check_var = drm_fb_helper_check_var,
  84         .fb_set_par = drm_fb_helper_set_par,
  85         .fb_pan_display = drm_fb_helper_pan_display,
  86         .fb_blank = drm_fb_helper_blank,
  87         .fb_setcmap = drm_fb_helper_setcmap,
  88
  89         .fb_debug_enter = drm_fb_helper_debug_enter,
  90         .fb_debug_leave = drm_fb_helper_debug_leave,
  91 };
  92
  93 static int omap_fbdev_create(struct drm_fb_helper *helper,
  94                 struct drm_fb_helper_surface_size *sizes)
  95 {
  96         struct omap_fbdev *fbdev = to_omap_fbdev(helper);
  97         struct drm_device *dev = helper->dev;
  98         struct drm_framebuffer *fb = NULL;
  99         struct fb_info *fbi = NULL;
 100         struct drm_mode_fb_cmd mode_cmd = {0};
 101         dma_addr_t paddr;
 102         void __iomem *vaddr;
 103         int size, screen_width;
 104         int ret;
 105
 106         /* only doing ARGB32 since this is what is needed to alpha-blend
 107          * with video overlays:
 108          */
 109         sizes->surface_bpp = 32;
 110         sizes->surface_depth = 32;
 111
 112         DBG("create fbdev: %dx%d@%d", sizes->surface_width,
 113                         sizes->surface_height, sizes->surface_bpp);
 114
 115         mode_cmd.width = sizes->surface_width;
 116         mode_cmd.height = sizes->surface_height;
 117
 118         mode_cmd.bpp = sizes->surface_bpp;
 119         mode_cmd.depth = sizes->surface_depth;
 120
 121         fb = omap_framebuffer_init(dev, &mode_cmd, NULL);
 122         if (!fb) {
 123                 dev_err(dev->dev, "failed to allocate fb\n");
 124                 ret = -ENOMEM;
 125                 goto fail;
 126         }
 127
 128         mutex_lock(&dev->struct_mutex);
 129
 130         fbi = framebuffer_alloc(0, dev->dev);
 131         if (!fbi) {
 132                 dev_err(dev->dev, "failed to allocate fb info\n");
 133                 ret = -ENOMEM;
 134                 goto fail_unlock;
 135         }
 136
 137         DBG("fbi=%p, dev=%p", fbi, dev);
 138
 139         fbdev->fb = fb;
 140         helper->fb = fb;
 141         helper->fbdev = fbi;
 142
 143         fbi->par = helper;
 144         fbi->flags = FBINFO_DEFAULT;
 145         fbi->fbops = &omap_fb_ops;
 146
 147         strcpy(fbi->fix.id, MODULE_NAME);
 148
 149         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 150         if (ret) {
 151                 ret = -ENOMEM;
 152                 goto fail_unlock;
 153         }
 154
 155         drm_fb_helper_fill_fix(fbi, fb->pitch, fb->depth);
 156         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
 157
 158         size = omap_framebuffer_get_buffer(fb, 0, 0,
 159                         &vaddr, &paddr, &screen_width);
 160
 161         dev->mode_config.fb_base = paddr;
 162
 163         fbi->screen_base = vaddr;
 164         fbi->screen_size = size;
 165         fbi->fix.smem_start = paddr;
 166         fbi->fix.smem_len = size;
 167
 168         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 169         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 170
 171         mutex_unlock(&dev->struct_mutex);
 172
 173         return 0;
 174
 175 fail_unlock:
 176         mutex_unlock(&dev->struct_mutex);
 177 fail:
 178
 179         if (ret) {
 180                 if (fbi)
 181                         framebuffer_release(fbi);
 182                 if (fb)
 183                         fb->funcs->destroy(fb);
 184         }
 185
 186         return ret;
 187 }
 188
 189 static void omap_crtc_fb_gamma_set(struct drm_crtc *crtc,
 190                 u16 red, u16 green, u16 blue, int regno)
 191 {
 192         DBG("fbdev: set gamma");
 193 }
 194
 195 static void omap_crtc_fb_gamma_get(struct drm_crtc *crtc,
 196                 u16 *red, u16 *green, u16 *blue, int regno)
 197 {
 198         DBG("fbdev: get gamma");
 199 }
 200
 201 static int omap_fbdev_probe(struct drm_fb_helper *helper,
 202                 struct drm_fb_helper_surface_size *sizes)
 203 {
 204         int new_fb = 0;
 205         int ret;
 206
 207         if (!helper->fb) {
 208                 ret = omap_fbdev_create(helper, sizes);
 209                 if (ret)
 210                         return ret;
 211                 new_fb = 1;
 212         }
 213         return new_fb;
 214 }
 215
 216 static struct drm_fb_helper_funcs omap_fb_helper_funcs = {
 217         .gamma_set = omap_crtc_fb_gamma_set,
 218         .gamma_get = omap_crtc_fb_gamma_get,
 219         .fb_probe = omap_fbdev_probe,
 220 };
 221
 222 static struct drm_fb_helper *get_fb(struct fb_info *fbi)
 223 {
 224         if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
 225                 /* these are not the fb's you're looking for */
 226                 return NULL;
 227         }
 228         return fbi->par;
 229 }
 230
 231 /* flush an area of the framebuffer (in case of manual update display that
 232  * is not automatically flushed)
 233  */
 234 static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h)
 235 {
 236         struct drm_fb_helper *helper = get_fb(fbi);
 237
 238         if (!helper)
 239                 return;
 240
 241         VERB("flush fbdev: %d,%d %dx%d, fbi=%p", x, y, w, h, fbi);
 242
 243         omap_framebuffer_flush(helper->fb, x, y, w, h);
 244 }
 245
 246 /* initialize fbdev helper */
 247 struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
 248 {
 249         struct omap_drm_private *priv = dev->dev_private;
 250         struct omap_fbdev *fbdev = NULL;
 251         struct drm_fb_helper *helper;
 252         int ret = 0;
 253
 254         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 255         if (!fbdev) {
 256                 dev_err(dev->dev, "could not allocate fbdev\n");
 257                 goto fail;
 258         }
 259
 260         helper = &fbdev->base;
 261
 262         helper->funcs = &omap_fb_helper_funcs;
 263
 264         ret = drm_fb_helper_init(dev, helper,
 265                         priv->num_crtcs, priv->num_connectors);
 266         if (ret) {
 267                 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
 268                 goto fail;
 269         }
 270
 271         drm_fb_helper_single_add_all_connectors(helper);
 272         drm_fb_helper_initial_config(helper, 32);
 273
 274         priv->fbdev = helper;
 275
 276         return helper;
 277
 278 fail:
 279         kfree(fbdev);
 280         return NULL;
 281 }
 282
 283 void omap_fbdev_free(struct drm_device *dev)
 284 {
 285         struct omap_drm_private *priv = dev->dev_private;
 286         struct drm_fb_helper *helper = priv->fbdev;
 287         struct omap_fbdev *fbdev;
 288         struct fb_info *fbi;
 289
 290         DBG();
 291
 292         fbi = helper->fbdev;
 293
 294         unregister_framebuffer(fbi);
 295         framebuffer_release(fbi);
 296
 297         drm_fb_helper_fini(helper);
 298
 299         fbdev = to_omap_fbdev(priv->fbdev);
 300
 301         kfree(fbdev);
 302
 303         priv->fbdev = NULL;
 304 }