Pileus Git - ~andy/linux/blob - drivers/staging/omapdrm/omap_fb.c

   1 /*
   2  * drivers/staging/omapdrm/omap_fb.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_crtc_helper.h"
  24
  25 /*
  26  * framebuffer funcs
  27  */
  28
  29 /* per-format info: */
  30 struct format {
  31         enum omap_color_mode dss_format;
  32         uint32_t pixel_format;
  33         struct {
  34                 int stride_bpp;           /* this times width is stride */
  35                 int sub_y;                /* sub-sample in y dimension */
  36         } planes[4];
  37         bool yuv;
  38 };
  39
  40 static const struct format formats[] = {
  41         /* 16bpp [A]RGB: */
  42         { OMAP_DSS_COLOR_RGB16,       DRM_FORMAT_RGB565,   {{2, 1}}, false }, /* RGB16-565 */
  43         { OMAP_DSS_COLOR_RGB12U,      DRM_FORMAT_RGBX4444, {{2, 1}}, false }, /* RGB12x-4444 */
  44         { OMAP_DSS_COLOR_RGBX16,      DRM_FORMAT_XRGB4444, {{2, 1}}, false }, /* xRGB12-4444 */
  45         { OMAP_DSS_COLOR_RGBA16,      DRM_FORMAT_RGBA4444, {{2, 1}}, false }, /* RGBA12-4444 */
  46         { OMAP_DSS_COLOR_ARGB16,      DRM_FORMAT_ARGB4444, {{2, 1}}, false }, /* ARGB16-4444 */
  47         { OMAP_DSS_COLOR_XRGB16_1555, DRM_FORMAT_XRGB1555, {{2, 1}}, false }, /* xRGB15-1555 */
  48         { OMAP_DSS_COLOR_ARGB16_1555, DRM_FORMAT_ARGB1555, {{2, 1}}, false }, /* ARGB16-1555 */
  49         /* 24bpp RGB: */
  50         { OMAP_DSS_COLOR_RGB24P,      DRM_FORMAT_RGB888,   {{3, 1}}, false }, /* RGB24-888 */
  51         /* 32bpp [A]RGB: */
  52         { OMAP_DSS_COLOR_RGBX32,      DRM_FORMAT_RGBX8888, {{4, 1}}, false }, /* RGBx24-8888 */
  53         { OMAP_DSS_COLOR_RGB24U,      DRM_FORMAT_XRGB8888, {{4, 1}}, false }, /* xRGB24-8888 */
  54         { OMAP_DSS_COLOR_RGBA32,      DRM_FORMAT_RGBA8888, {{4, 1}}, false }, /* RGBA32-8888 */
  55         { OMAP_DSS_COLOR_ARGB32,      DRM_FORMAT_ARGB8888, {{4, 1}}, false }, /* ARGB32-8888 */
  56         /* YUV: */
  57         { OMAP_DSS_COLOR_NV12,        DRM_FORMAT_NV12,     {{1, 1}, {1, 2}}, true },
  58         { OMAP_DSS_COLOR_YUV2,        DRM_FORMAT_YUYV,     {{2, 1}}, true },
  59         { OMAP_DSS_COLOR_UYVY,        DRM_FORMAT_UYVY,     {{2, 1}}, true },
  60 };
  61
  62 #define to_omap_framebuffer(x) container_of(x, struct omap_framebuffer, base)
  63
  64 struct omap_framebuffer {
  65         struct drm_framebuffer base;
  66         struct drm_gem_object *bo;
  67         int size;
  68         dma_addr_t paddr;
  69         const struct format *format;
  70 };
  71
  72 static int omap_framebuffer_create_handle(struct drm_framebuffer *fb,
  73                 struct drm_file *file_priv,
  74                 unsigned int *handle)
  75 {
  76         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
  77     return drm_gem_handle_create(file_priv, omap_fb->bo, handle);
  78 }
  79
  80 static void omap_framebuffer_destroy(struct drm_framebuffer *fb)
  81 {
  82         struct drm_device *dev = fb->dev;
  83         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
  84
  85         DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);
  86
  87         drm_framebuffer_cleanup(fb);
  88
  89         if (omap_fb->bo) {
  90                 if (omap_fb->paddr && omap_gem_put_paddr(omap_fb->bo))
  91                         dev_err(dev->dev, "could not unmap!\n");
  92                 drm_gem_object_unreference_unlocked(omap_fb->bo);
  93         }
  94
  95         kfree(omap_fb);
  96 }
  97
  98 static int omap_framebuffer_dirty(struct drm_framebuffer *fb,
  99                 struct drm_file *file_priv, unsigned flags, unsigned color,
 100                 struct drm_clip_rect *clips, unsigned num_clips)
 101 {
 102         int i;
 103
 104         for (i = 0; i < num_clips; i++) {
 105                 omap_framebuffer_flush(fb, clips[i].x1, clips[i].y1,
 106                                         clips[i].x2 - clips[i].x1,
 107                                         clips[i].y2 - clips[i].y1);
 108         }
 109
 110         return 0;
 111 }
 112
 113 static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {
 114         .create_handle = omap_framebuffer_create_handle,
 115         .destroy = omap_framebuffer_destroy,
 116         .dirty = omap_framebuffer_dirty,
 117 };
 118
 119 /* returns the buffer size */
 120 int omap_framebuffer_get_buffer(struct drm_framebuffer *fb, int x, int y,
 121                 void **vaddr, dma_addr_t *paddr, unsigned int *screen_width)
 122 {
 123         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 124         int bpp = fb->bits_per_pixel / 8;
 125         unsigned long offset;
 126
 127         offset = (x * bpp) + (y * fb->pitches[0]);
 128
 129         if (vaddr) {
 130                 void *bo_vaddr = omap_gem_vaddr(omap_fb->bo);
 131                 /* note: we can only count on having a vaddr for buffers that
 132                  * are allocated physically contiguously to begin with (ie.
 133                  * dma_alloc_coherent()).  But this should be ok because it
 134                  * is only used by legacy fbdev
 135                  */
 136                 BUG_ON(IS_ERR_OR_NULL(bo_vaddr));
 137                 *vaddr = bo_vaddr + offset;
 138         }
 139
 140         *paddr = omap_fb->paddr + offset;
 141         *screen_width = fb->pitches[0] / bpp;
 142
 143         return omap_fb->size - offset;
 144 }
 145
 146 struct drm_gem_object *omap_framebuffer_bo(struct drm_framebuffer *fb)
 147 {
 148         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 149         return omap_fb->bo;
 150 }
 151
 152 /* iterate thru all the connectors, returning ones that are attached
 153  * to the same fb..
 154  */
 155 struct drm_connector *omap_framebuffer_get_next_connector(
 156                 struct drm_framebuffer *fb, struct drm_connector *from)
 157 {
 158         struct drm_device *dev = fb->dev;
 159         struct list_head *connector_list = &dev->mode_config.connector_list;
 160         struct drm_connector *connector = from;
 161
 162         if (!from) {
 163                 return list_first_entry(connector_list, typeof(*from), head);
 164         }
 165
 166         list_for_each_entry_from(connector, connector_list, head) {
 167                 if (connector != from) {
 168                         struct drm_encoder *encoder = connector->encoder;
 169                         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 170                         if (crtc && crtc->fb == fb) {
 171                                 return connector;
 172                         }
 173                 }
 174         }
 175
 176         return NULL;
 177 }
 178
 179 /* flush an area of the framebuffer (in case of manual update display that
 180  * is not automatically flushed)
 181  */
 182 void omap_framebuffer_flush(struct drm_framebuffer *fb,
 183                 int x, int y, int w, int h)
 184 {
 185         struct drm_connector *connector = NULL;
 186
 187         VERB("flush: %d,%d %dx%d, fb=%p", x, y, w, h, fb);
 188
 189         while ((connector = omap_framebuffer_get_next_connector(fb, connector))) {
 190                 /* only consider connectors that are part of a chain */
 191                 if (connector->encoder && connector->encoder->crtc) {
 192                         /* TODO: maybe this should propagate thru the crtc who
 193                          * could do the coordinate translation..
 194                          */
 195                         struct drm_crtc *crtc = connector->encoder->crtc;
 196                         int cx = max(0, x - crtc->x);
 197                         int cy = max(0, y - crtc->y);
 198                         int cw = w + (x - crtc->x) - cx;
 199                         int ch = h + (y - crtc->y) - cy;
 200
 201                         omap_connector_flush(connector, cx, cy, cw, ch);
 202                 }
 203         }
 204 }
 205
 206 struct drm_framebuffer *omap_framebuffer_create(struct drm_device *dev,
 207                 struct drm_file *file, struct drm_mode_fb_cmd2 *mode_cmd)
 208 {
 209         struct drm_gem_object *bos[4];
 210         struct drm_framebuffer *fb;
 211         int ret;
 212
 213         ret = objects_lookup(dev, file, mode_cmd->pixel_format,
 214                         bos, mode_cmd->handles);
 215         if (ret)
 216                 return ERR_PTR(ret);
 217
 218         fb = omap_framebuffer_init(dev, mode_cmd, bos);
 219         if (IS_ERR(fb)) {
 220                 int i, n = drm_format_num_planes(mode_cmd->pixel_format);
 221                 for (i = 0; i < n; i++)
 222                         drm_gem_object_unreference_unlocked(bos[i]);
 223                 return fb;
 224         }
 225         return fb;
 226 }
 227
 228 struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
 229                 struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 230 {
 231         struct omap_framebuffer *omap_fb;
 232         struct drm_framebuffer *fb = NULL;
 233         const struct format *format = NULL;
 234         int i, size, ret;
 235
 236         DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
 237                         dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 238                         (char *)&mode_cmd->pixel_format);
 239
 240         for (i = 0; i < ARRAY_SIZE(formats); i++) {
 241                 if (formats[i].pixel_format == mode_cmd->pixel_format) {
 242                         format = &formats[i];
 243                         break;
 244                 }
 245         }
 246
 247         if (!format) {
 248                 dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
 249                                 (char *)&mode_cmd->pixel_format);
 250                 ret = -EINVAL;
 251                 goto fail;
 252         }
 253
 254         /* in case someone tries to feed us a completely bogus stride: */
 255         mode_cmd->pitches[0] = align_pitch(mode_cmd->pitches[0],
 256                         mode_cmd->width, format->planes[0].stride_bpp);
 257
 258         omap_fb = kzalloc(sizeof(*omap_fb), GFP_KERNEL);
 259         if (!omap_fb) {
 260                 dev_err(dev->dev, "could not allocate fb\n");
 261                 ret = -ENOMEM;
 262                 goto fail;
 263         }
 264
 265         fb = &omap_fb->base;
 266         ret = drm_framebuffer_init(dev, fb, &omap_framebuffer_funcs);
 267         if (ret) {
 268                 dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 269                 goto fail;
 270         }
 271
 272         DBG("create: FB ID: %d (%p)", fb->base.id, fb);
 273
 274         size = PAGE_ALIGN(mode_cmd->pitches[0] * mode_cmd->height);
 275
 276         if (size > bos[0]->size) {
 277                 dev_err(dev->dev, "provided buffer object is too small!\n");
 278                 ret = -EINVAL;
 279                 goto fail;
 280         }
 281
 282         omap_fb->bo = bos[0];
 283         omap_fb->size = size;
 284
 285         ret = omap_gem_get_paddr(bos[0], &omap_fb->paddr, true);
 286         if (ret) {
 287                 dev_err(dev->dev, "could not map (paddr)!\n");
 288                 goto fail;
 289         }
 290
 291         drm_helper_mode_fill_fb_struct(fb, mode_cmd);
 292
 293         return fb;
 294
 295 fail:
 296         if (fb) {
 297                 omap_framebuffer_destroy(fb);
 298         }
 299         return ERR_PTR(ret);
 300 }