drivers/gpu/drm/gma500/accel_2d.c

   1 /**************************************************************************
   2  * Copyright (c) 2007-2011, Intel Corporation.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
  19  * develop this driver.
  20  *
  21  **************************************************************************/
  22
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/errno.h>
  26 #include <linux/string.h>
  27 #include <linux/mm.h>
  28 #include <linux/tty.h>
  29 #include <linux/slab.h>
  30 #include <linux/delay.h>
  31 #include <linux/init.h>
  32 #include <linux/console.h>
  33
  34 #include <drm/drmP.h>
  35 #include <drm/drm.h>
  36 #include <drm/drm_crtc.h>
  37
  38 #include "psb_drv.h"
  39 #include "psb_reg.h"
  40 #include "framebuffer.h"
  41
  42 /**
  43  *      psb_spank               -       reset the 2D engine
  44  *      @dev_priv: our PSB DRM device
  45  *
  46  *      Soft reset the graphics engine and then reload the necessary registers.
  47  *      We use this at initialisation time but it will become relevant for
  48  *      accelerated X later
  49  */
  50 void psb_spank(struct drm_psb_private *dev_priv)
  51 {
  52         PSB_WSGX32(_PSB_CS_RESET_BIF_RESET | _PSB_CS_RESET_DPM_RESET |
  53                 _PSB_CS_RESET_TA_RESET | _PSB_CS_RESET_USE_RESET |
  54                 _PSB_CS_RESET_ISP_RESET | _PSB_CS_RESET_TSP_RESET |
  55                 _PSB_CS_RESET_TWOD_RESET, PSB_CR_SOFT_RESET);
  56         PSB_RSGX32(PSB_CR_SOFT_RESET);
  57
  58         msleep(1);
  59
  60         PSB_WSGX32(0, PSB_CR_SOFT_RESET);
  61         wmb();
  62         PSB_WSGX32(PSB_RSGX32(PSB_CR_BIF_CTRL) | _PSB_CB_CTRL_CLEAR_FAULT,
  63                    PSB_CR_BIF_CTRL);
  64         wmb();
  65         (void) PSB_RSGX32(PSB_CR_BIF_CTRL);
  66
  67         msleep(1);
  68         PSB_WSGX32(PSB_RSGX32(PSB_CR_BIF_CTRL) & ~_PSB_CB_CTRL_CLEAR_FAULT,
  69                    PSB_CR_BIF_CTRL);
  70         (void) PSB_RSGX32(PSB_CR_BIF_CTRL);
  71         PSB_WSGX32(dev_priv->gtt.gatt_start, PSB_CR_BIF_TWOD_REQ_BASE);
  72 }
  73
  74 /**
  75  *      psb2_2d_wait_available  -       wait for FIFO room
  76  *      @dev_priv: our DRM device
  77  *      @size: size (in dwords) of the command we want to issue
  78  *
  79  *      Wait until there is room to load the FIFO with our data. If the
  80  *      device is not responding then reset it
  81  */
  82 static int psb_2d_wait_available(struct drm_psb_private *dev_priv,
  83                           unsigned size)
  84 {
  85         uint32_t avail = PSB_RSGX32(PSB_CR_2D_SOCIF);
  86         unsigned long t = jiffies + HZ;
  87
  88         while (avail < size) {
  89                 avail = PSB_RSGX32(PSB_CR_2D_SOCIF);
  90                 if (time_after(jiffies, t)) {
  91                         psb_spank(dev_priv);
  92                         return -EIO;
  93                 }
  94         }
  95         return 0;
  96 }
  97
  98 /**
  99  *      psb_2d_submit           -       submit a 2D command
 100  *      @dev_priv: our DRM device
 101  *      @cmdbuf: command to issue
 102  *      @size: length (in dwords)
 103  *
 104  *      Issue one or more 2D commands to the accelerator. This needs to be
 105  *      serialized later when we add the GEM interfaces for acceleration
 106  */
 107 static int psbfb_2d_submit(struct drm_psb_private *dev_priv, uint32_t *cmdbuf,
 108                                                                 unsigned size)
 109 {
 110         int ret = 0;
 111         int i;
 112         unsigned submit_size;
 113         unsigned long flags;
 114
 115         spin_lock_irqsave(&dev_priv->lock_2d, flags);
 116         while (size > 0) {
 117                 submit_size = (size < 0x60) ? size : 0x60;
 118                 size -= submit_size;
 119                 ret = psb_2d_wait_available(dev_priv, submit_size);
 120                 if (ret)
 121                         break;
 122
 123                 submit_size <<= 2;
 124
 125                 for (i = 0; i < submit_size; i += 4)
 126                         PSB_WSGX32(*cmdbuf++, PSB_SGX_2D_SLAVE_PORT + i);
 127
 128                 (void)PSB_RSGX32(PSB_SGX_2D_SLAVE_PORT + i - 4);
 129         }
 130         spin_unlock_irqrestore(&dev_priv->lock_2d, flags);
 131         return ret;
 132 }
 133
 134
 135 /**
 136  *      psb_accel_2d_copy_direction     -       compute blit order
 137  *      @xdir: X direction of move
 138  *      @ydir: Y direction of move
 139  *
 140  *      Compute the correct order setings to ensure that an overlapping blit
 141  *      correctly copies all the pixels.
 142  */
 143 static u32 psb_accel_2d_copy_direction(int xdir, int ydir)
 144 {
 145         if (xdir < 0)
 146                 return (ydir < 0) ? PSB_2D_COPYORDER_BR2TL :
 147                                                 PSB_2D_COPYORDER_TR2BL;
 148         else
 149                 return (ydir < 0) ? PSB_2D_COPYORDER_BL2TR :
 150                                                 PSB_2D_COPYORDER_TL2BR;
 151 }
 152
 153 /**
 154  *      psb_accel_2d_copy               -       accelerated 2D copy
 155  *      @dev_priv: our DRM device
 156  *      @src_offset in bytes
 157  *      @src_stride in bytes
 158  *      @src_format psb 2D format defines
 159  *      @dst_offset in bytes
 160  *      @dst_stride in bytes
 161  *      @dst_format psb 2D format defines
 162  *      @src_x offset in pixels
 163  *      @src_y offset in pixels
 164  *      @dst_x offset in pixels
 165  *      @dst_y offset in pixels
 166  *      @size_x of the copied area
 167  *      @size_y of the copied area
 168  *
 169  *      Format and issue a 2D accelerated copy command.
 170  */
 171 static int psb_accel_2d_copy(struct drm_psb_private *dev_priv,
 172                              uint32_t src_offset, uint32_t src_stride,
 173                              uint32_t src_format, uint32_t dst_offset,
 174                              uint32_t dst_stride, uint32_t dst_format,
 175                              uint16_t src_x, uint16_t src_y,
 176                              uint16_t dst_x, uint16_t dst_y,
 177                              uint16_t size_x, uint16_t size_y)
 178 {
 179         uint32_t blit_cmd;
 180         uint32_t buffer[10];
 181         uint32_t *buf;
 182         uint32_t direction;
 183
 184         buf = buffer;
 185
 186         direction =
 187             psb_accel_2d_copy_direction(src_x - dst_x, src_y - dst_y);
 188
 189         if (direction == PSB_2D_COPYORDER_BR2TL ||
 190             direction == PSB_2D_COPYORDER_TR2BL) {
 191                 src_x += size_x - 1;
 192                 dst_x += size_x - 1;
 193         }
 194         if (direction == PSB_2D_COPYORDER_BR2TL ||
 195             direction == PSB_2D_COPYORDER_BL2TR) {
 196                 src_y += size_y - 1;
 197                 dst_y += size_y - 1;
 198         }
 199
 200         blit_cmd =
 201             PSB_2D_BLIT_BH |
 202             PSB_2D_ROT_NONE |
 203             PSB_2D_DSTCK_DISABLE |
 204             PSB_2D_SRCCK_DISABLE |
 205             PSB_2D_USE_PAT | PSB_2D_ROP3_SRCCOPY | direction;
 206
 207         *buf++ = PSB_2D_FENCE_BH;
 208         *buf++ =
 209             PSB_2D_DST_SURF_BH | dst_format | (dst_stride <<
 210                                                PSB_2D_DST_STRIDE_SHIFT);
 211         *buf++ = dst_offset;
 212         *buf++ =
 213             PSB_2D_SRC_SURF_BH | src_format | (src_stride <<
 214                                                PSB_2D_SRC_STRIDE_SHIFT);
 215         *buf++ = src_offset;
 216         *buf++ =
 217             PSB_2D_SRC_OFF_BH | (src_x << PSB_2D_SRCOFF_XSTART_SHIFT) |
 218             (src_y << PSB_2D_SRCOFF_YSTART_SHIFT);
 219         *buf++ = blit_cmd;
 220         *buf++ =
 221             (dst_x << PSB_2D_DST_XSTART_SHIFT) | (dst_y <<
 222                                                   PSB_2D_DST_YSTART_SHIFT);
 223         *buf++ =
 224             (size_x << PSB_2D_DST_XSIZE_SHIFT) | (size_y <<
 225                                                   PSB_2D_DST_YSIZE_SHIFT);
 226         *buf++ = PSB_2D_FLUSH_BH;
 227
 228         return psbfb_2d_submit(dev_priv, buffer, buf - buffer);
 229 }
 230
 231 /**
 232  *      psbfb_copyarea_accel    -       copyarea acceleration for /dev/fb
 233  *      @info: our framebuffer
 234  *      @a: copyarea parameters from the framebuffer core
 235  *
 236  *      Perform a 2D copy via the accelerator
 237  */
 238 static void psbfb_copyarea_accel(struct fb_info *info,
 239                                  const struct fb_copyarea *a)
 240 {
 241         struct psb_fbdev *fbdev = info->par;
 242         struct psb_framebuffer *psbfb = &fbdev->pfb;
 243         struct drm_device *dev = psbfb->base.dev;
 244         struct drm_framebuffer *fb = fbdev->psb_fb_helper.fb;
 245         struct drm_psb_private *dev_priv = dev->dev_private;
 246         uint32_t offset;
 247         uint32_t stride;
 248         uint32_t src_format;
 249         uint32_t dst_format;
 250
 251         if (!fb)
 252                 return;
 253
 254         offset = psbfb->gtt->offset;
 255         stride = fb->pitches[0];
 256
 257         switch (fb->depth) {
 258         case 8:
 259                 src_format = PSB_2D_SRC_332RGB;
 260                 dst_format = PSB_2D_DST_332RGB;
 261                 break;
 262         case 15:
 263                 src_format = PSB_2D_SRC_555RGB;
 264                 dst_format = PSB_2D_DST_555RGB;
 265                 break;
 266         case 16:
 267                 src_format = PSB_2D_SRC_565RGB;
 268                 dst_format = PSB_2D_DST_565RGB;
 269                 break;
 270         case 24:
 271         case 32:
 272                 /* this is wrong but since we don't do blending its okay */
 273                 src_format = PSB_2D_SRC_8888ARGB;
 274                 dst_format = PSB_2D_DST_8888ARGB;
 275                 break;
 276         default:
 277                 /* software fallback */
 278                 drm_fb_helper_cfb_copyarea(info, a);
 279                 return;
 280         }
 281
 282         if (!gma_power_begin(dev, false)) {
 283                 drm_fb_helper_cfb_copyarea(info, a);
 284                 return;
 285         }
 286         psb_accel_2d_copy(dev_priv,
 287                           offset, stride, src_format,
 288                           offset, stride, dst_format,
 289                           a->sx, a->sy, a->dx, a->dy, a->width, a->height);
 290         gma_power_end(dev);
 291 }
 292
 293 /**
 294  *      psbfb_copyarea  -       2D copy interface
 295  *      @info: our framebuffer
 296  *      @region: region to copy
 297  *
 298  *      Copy an area of the framebuffer console either by the accelerator
 299  *      or directly using the cfb helpers according to the request
 300  */
 301 void psbfb_copyarea(struct fb_info *info,
 302                            const struct fb_copyarea *region)
 303 {
 304         if (unlikely(info->state != FBINFO_STATE_RUNNING))
 305                 return;
 306
 307         /* Avoid the 8 pixel erratum */
 308         if (region->width == 8 || region->height == 8 ||
 309                 (info->flags & FBINFO_HWACCEL_DISABLED))
 310                 return drm_fb_helper_cfb_copyarea(info, region);
 311
 312         psbfb_copyarea_accel(info, region);
 313 }
 314
 315 /**
 316  *      psbfb_sync      -       synchronize 2D
 317  *      @info: our framebuffer
 318  *
 319  *      Wait for the 2D engine to quiesce so that we can do CPU
 320  *      access to the framebuffer again
 321  */
 322 int psbfb_sync(struct fb_info *info)
 323 {
 324         struct psb_fbdev *fbdev = info->par;
 325         struct psb_framebuffer *psbfb = &fbdev->pfb;
 326         struct drm_device *dev = psbfb->base.dev;
 327         struct drm_psb_private *dev_priv = dev->dev_private;
 328         unsigned long _end = jiffies + HZ;
 329         int busy = 0;
 330         unsigned long flags;
 331
 332         spin_lock_irqsave(&dev_priv->lock_2d, flags);
 333         /*
 334          * First idle the 2D engine.
 335          */
 336
 337         if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) &&
 338             ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0))
 339                 goto out;
 340
 341         do {
 342                 busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
 343                 cpu_relax();
 344         } while (busy && !time_after_eq(jiffies, _end));
 345
 346         if (busy)
 347                 busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
 348         if (busy)
 349                 goto out;
 350
 351         do {
 352                 busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
 353                                                 _PSB_C2B_STATUS_BUSY) != 0);
 354                 cpu_relax();
 355         } while (busy && !time_after_eq(jiffies, _end));
 356         if (busy)
 357                 busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
 358                                         _PSB_C2B_STATUS_BUSY) != 0);
 359
 360 out:
 361         spin_unlock_irqrestore(&dev_priv->lock_2d, flags);
 362         return (busy) ? -EBUSY : 0;
 363 }