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/fb.h>
  32 #include <linux/init.h>
  33 #include <linux/console.h>
  34
  35 #include <drm/drmP.h>
  36 #include <drm/drm.h>
  37 #include <drm/drm_crtc.h>
  38
  39 #include "psb_drv.h"
  40 #include "psb_reg.h"
  41 #include "framebuffer.h"
  42
  43 /**
  44  *      psb_spank               -       reset the 2D engine
  45  *      @dev_priv: our PSB DRM device
  46  *
  47  *      Soft reset the graphics engine and then reload the necessary registers.
  48  *      We use this at initialisation time but it will become relevant for
  49  *      accelerated X later
  50  */
  51 void psb_spank(struct drm_psb_private *dev_priv)
  52 {
  53         PSB_WSGX32(_PSB_CS_RESET_BIF_RESET | _PSB_CS_RESET_DPM_RESET |
  54                 _PSB_CS_RESET_TA_RESET | _PSB_CS_RESET_USE_RESET |
  55                 _PSB_CS_RESET_ISP_RESET | _PSB_CS_RESET_TSP_RESET |
  56                 _PSB_CS_RESET_TWOD_RESET, PSB_CR_SOFT_RESET);
  57         PSB_RSGX32(PSB_CR_SOFT_RESET);
  58
  59         msleep(1);
  60
  61         PSB_WSGX32(0, PSB_CR_SOFT_RESET);
  62         wmb();
  63         PSB_WSGX32(PSB_RSGX32(PSB_CR_BIF_CTRL) | _PSB_CB_CTRL_CLEAR_FAULT,
  64                    PSB_CR_BIF_CTRL);
  65         wmb();
  66         (void) PSB_RSGX32(PSB_CR_BIF_CTRL);
  67
  68         msleep(1);
  69         PSB_WSGX32(PSB_RSGX32(PSB_CR_BIF_CTRL) & ~_PSB_CB_CTRL_CLEAR_FAULT,
  70                    PSB_CR_BIF_CTRL);
  71         (void) PSB_RSGX32(PSB_CR_BIF_CTRL);
  72         PSB_WSGX32(dev_priv->gtt.gatt_start, PSB_CR_BIF_TWOD_REQ_BASE);
  73 }
  74
  75 /**
  76  *      psb2_2d_wait_available  -       wait for FIFO room
  77  *      @dev_priv: our DRM device
  78  *      @size: size (in dwords) of the command we want to issue
  79  *
  80  *      Wait until there is room to load the FIFO with our data. If the
  81  *      device is not responding then reset it
  82  */
  83 static int psb_2d_wait_available(struct drm_psb_private *dev_priv,
  84                           unsigned size)
  85 {
  86         uint32_t avail = PSB_RSGX32(PSB_CR_2D_SOCIF);
  87         unsigned long t = jiffies + HZ;
  88
  89         while (avail < size) {
  90                 avail = PSB_RSGX32(PSB_CR_2D_SOCIF);
  91                 if (time_after(jiffies, t)) {
  92                         psb_spank(dev_priv);
  93                         return -EIO;
  94                 }
  95         }
  96         return 0;
  97 }
  98
  99 /**
 100  *      psb_2d_submit           -       submit a 2D command
 101  *      @dev_priv: our DRM device
 102  *      @cmdbuf: command to issue
 103  *      @size: length (in dwords)
 104  *
 105  *      Issue one or more 2D commands to the accelerator. This needs to be
 106  *      serialized later when we add the GEM interfaces for acceleration
 107  */
 108 static int psbfb_2d_submit(struct drm_psb_private *dev_priv, uint32_t *cmdbuf,
 109                                                                 unsigned size)
 110 {
 111         int ret = 0;
 112         int i;
 113         unsigned submit_size;
 114         unsigned long flags;
 115
 116         spin_lock_irqsave(&dev_priv->lock_2d, flags);
 117         while (size > 0) {
 118                 submit_size = (size < 0x60) ? size : 0x60;
 119                 size -= submit_size;
 120                 ret = psb_2d_wait_available(dev_priv, submit_size);
 121                 if (ret)
 122                         break;
 123
 124                 submit_size <<= 2;
 125
 126                 for (i = 0; i < submit_size; i += 4)
 127                         PSB_WSGX32(*cmdbuf++, PSB_SGX_2D_SLAVE_PORT + i);
 128
 129                 (void)PSB_RSGX32(PSB_SGX_2D_SLAVE_PORT + i - 4);
 130         }
 131         spin_unlock_irqrestore(&dev_priv->lock_2d, flags);
 132         return ret;
 133 }
 134
 135
 136 /**
 137  *      psb_accel_2d_copy_direction     -       compute blit order
 138  *      @xdir: X direction of move
 139  *      @ydir: Y direction of move
 140  *
 141  *      Compute the correct order setings to ensure that an overlapping blit
 142  *      correctly copies all the pixels.
 143  */
 144 static u32 psb_accel_2d_copy_direction(int xdir, int ydir)
 145 {
 146         if (xdir < 0)
 147                 return (ydir < 0) ? PSB_2D_COPYORDER_BR2TL :
 148                                                 PSB_2D_COPYORDER_TR2BL;
 149         else
 150                 return (ydir < 0) ? PSB_2D_COPYORDER_BL2TR :
 151                                                 PSB_2D_COPYORDER_TL2BR;
 152 }
 153
 154 /**
 155  *      psb_accel_2d_copy               -       accelerated 2D copy
 156  *      @dev_priv: our DRM device
 157  *      @src_offset in bytes
 158  *      @src_stride in bytes
 159  *      @src_format psb 2D format defines
 160  *      @dst_offset in bytes
 161  *      @dst_stride in bytes
 162  *      @dst_format psb 2D format defines
 163  *      @src_x offset in pixels
 164  *      @src_y offset in pixels
 165  *      @dst_x offset in pixels
 166  *      @dst_y offset in pixels
 167  *      @size_x of the copied area
 168  *      @size_y of the copied area
 169  *
 170  *      Format and issue a 2D accelerated copy command.
 171  */
 172 static int psb_accel_2d_copy(struct drm_psb_private *dev_priv,
 173                              uint32_t src_offset, uint32_t src_stride,
 174                              uint32_t src_format, uint32_t dst_offset,
 175                              uint32_t dst_stride, uint32_t dst_format,
 176                              uint16_t src_x, uint16_t src_y,
 177                              uint16_t dst_x, uint16_t dst_y,
 178                              uint16_t size_x, uint16_t size_y)
 179 {
 180         uint32_t blit_cmd;
 181         uint32_t buffer[10];
 182         uint32_t *buf;
 183         uint32_t direction;
 184
 185         buf = buffer;
 186
 187         direction =
 188             psb_accel_2d_copy_direction(src_x - dst_x, src_y - dst_y);
 189
 190         if (direction == PSB_2D_COPYORDER_BR2TL ||
 191             direction == PSB_2D_COPYORDER_TR2BL) {
 192                 src_x += size_x - 1;
 193                 dst_x += size_x - 1;
 194         }
 195         if (direction == PSB_2D_COPYORDER_BR2TL ||
 196             direction == PSB_2D_COPYORDER_BL2TR) {
 197                 src_y += size_y - 1;
 198                 dst_y += size_y - 1;
 199         }
 200
 201         blit_cmd =
 202             PSB_2D_BLIT_BH |
 203             PSB_2D_ROT_NONE |
 204             PSB_2D_DSTCK_DISABLE |
 205             PSB_2D_SRCCK_DISABLE |
 206             PSB_2D_USE_PAT | PSB_2D_ROP3_SRCCOPY | direction;
 207
 208         *buf++ = PSB_2D_FENCE_BH;
 209         *buf++ =
 210             PSB_2D_DST_SURF_BH | dst_format | (dst_stride <<
 211                                                PSB_2D_DST_STRIDE_SHIFT);
 212         *buf++ = dst_offset;
 213         *buf++ =
 214             PSB_2D_SRC_SURF_BH | src_format | (src_stride <<
 215                                                PSB_2D_SRC_STRIDE_SHIFT);
 216         *buf++ = src_offset;
 217         *buf++ =
 218             PSB_2D_SRC_OFF_BH | (src_x << PSB_2D_SRCOFF_XSTART_SHIFT) |
 219             (src_y << PSB_2D_SRCOFF_YSTART_SHIFT);
 220         *buf++ = blit_cmd;
 221         *buf++ =
 222             (dst_x << PSB_2D_DST_XSTART_SHIFT) | (dst_y <<
 223                                                   PSB_2D_DST_YSTART_SHIFT);
 224         *buf++ =
 225             (size_x << PSB_2D_DST_XSIZE_SHIFT) | (size_y <<
 226                                                   PSB_2D_DST_YSIZE_SHIFT);
 227         *buf++ = PSB_2D_FLUSH_BH;
 228
 229         return psbfb_2d_submit(dev_priv, buffer, buf - buffer);
 230 }
 231
 232 /**
 233  *      psbfb_copyarea_accel    -       copyarea acceleration for /dev/fb
 234  *      @info: our framebuffer
 235  *      @a: copyarea parameters from the framebuffer core
 236  *
 237  *      Perform a 2D copy via the accelerator
 238  */
 239 static void psbfb_copyarea_accel(struct fb_info *info,
 240                                  const struct fb_copyarea *a)
 241 {
 242         struct psb_fbdev *fbdev = info->par;
 243         struct psb_framebuffer *psbfb = &fbdev->pfb;
 244         struct drm_device *dev = psbfb->base.dev;
 245         struct drm_framebuffer *fb = fbdev->psb_fb_helper.fb;
 246         struct drm_psb_private *dev_priv = dev->dev_private;
 247         uint32_t offset;
 248         uint32_t stride;
 249         uint32_t src_format;
 250         uint32_t dst_format;
 251
 252         if (!fb)
 253                 return;
 254
 255         offset = psbfb->gtt->offset;
 256         stride = fb->pitches[0];
 257
 258         switch (fb->depth) {
 259         case 8:
 260                 src_format = PSB_2D_SRC_332RGB;
 261                 dst_format = PSB_2D_DST_332RGB;
 262                 break;
 263         case 15:
 264                 src_format = PSB_2D_SRC_555RGB;
 265                 dst_format = PSB_2D_DST_555RGB;
 266                 break;
 267         case 16:
 268                 src_format = PSB_2D_SRC_565RGB;
 269                 dst_format = PSB_2D_DST_565RGB;
 270                 break;
 271         case 24:
 272         case 32:
 273                 /* this is wrong but since we don't do blending its okay */
 274                 src_format = PSB_2D_SRC_8888ARGB;
 275                 dst_format = PSB_2D_DST_8888ARGB;
 276                 break;
 277         default:
 278                 /* software fallback */
 279                 cfb_copyarea(info, a);
 280                 return;
 281         }
 282
 283         if (!gma_power_begin(dev, false)) {
 284                 cfb_copyarea(info, a);
 285                 return;
 286         }
 287         psb_accel_2d_copy(dev_priv,
 288                           offset, stride, src_format,
 289                           offset, stride, dst_format,
 290                           a->sx, a->sy, a->dx, a->dy, a->width, a->height);
 291         gma_power_end(dev);
 292 }
 293
 294 /**
 295  *      psbfb_copyarea  -       2D copy interface
 296  *      @info: our framebuffer
 297  *      @region: region to copy
 298  *
 299  *      Copy an area of the framebuffer console either by the accelerator
 300  *      or directly using the cfb helpers according to the request
 301  */
 302 void psbfb_copyarea(struct fb_info *info,
 303                            const struct fb_copyarea *region)
 304 {
 305         if (unlikely(info->state != FBINFO_STATE_RUNNING))
 306                 return;
 307
 308         /* Avoid the 8 pixel erratum */
 309         if (region->width == 8 || region->height == 8 ||
 310                 (info->flags & FBINFO_HWACCEL_DISABLED))
 311                 return cfb_copyarea(info, region);
 312
 313         psbfb_copyarea_accel(info, region);
 314 }
 315
 316 /**
 317  *      psbfb_sync      -       synchronize 2D
 318  *      @info: our framebuffer
 319  *
 320  *      Wait for the 2D engine to quiesce so that we can do CPU
 321  *      access to the framebuffer again
 322  */
 323 int psbfb_sync(struct fb_info *info)
 324 {
 325         struct psb_fbdev *fbdev = info->par;
 326         struct psb_framebuffer *psbfb = &fbdev->pfb;
 327         struct drm_device *dev = psbfb->base.dev;
 328         struct drm_psb_private *dev_priv = dev->dev_private;
 329         unsigned long _end = jiffies + HZ;
 330         int busy = 0;
 331         unsigned long flags;
 332
 333         spin_lock_irqsave(&dev_priv->lock_2d, flags);
 334         /*
 335          * First idle the 2D engine.
 336          */
 337
 338         if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) &&
 339             ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0))
 340                 goto out;
 341
 342         do {
 343                 busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
 344                 cpu_relax();
 345         } while (busy && !time_after_eq(jiffies, _end));
 346
 347         if (busy)
 348                 busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
 349         if (busy)
 350                 goto out;
 351
 352         do {
 353                 busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
 354                                                 _PSB_C2B_STATUS_BUSY) != 0);
 355                 cpu_relax();
 356         } while (busy && !time_after_eq(jiffies, _end));
 357         if (busy)
 358                 busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
 359                                         _PSB_C2B_STATUS_BUSY) != 0);
 360
 361 out:
 362         spin_unlock_irqrestore(&dev_priv->lock_2d, flags);
 363         return (busy) ? -EBUSY : 0;
 364 }