drivers/staging/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 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
 115         while (size > 0) {
 116                 submit_size = (size < 0x60) ? size : 0x60;
 117                 size -= submit_size;
 118                 ret = psb_2d_wait_available(dev_priv, submit_size);
 119                 if (ret)
 120                         return ret;
 121
 122                 submit_size <<= 2;
 123
 124                 for (i = 0; i < submit_size; i += 4)
 125                         PSB_WSGX32(*cmdbuf++, PSB_SGX_2D_SLAVE_PORT + i);
 126
 127                 (void)PSB_RSGX32(PSB_SGX_2D_SLAVE_PORT + i - 4);
 128         }
 129         return 0;
 130 }
 131
 132
 133 /**
 134  *      psb_accel_2d_copy_direction     -       compute blit order
 135  *      @xdir: X direction of move
 136  *      @ydir: Y direction of move
 137  *
 138  *      Compute the correct order setings to ensure that an overlapping blit
 139  *      correctly copies all the pixels.
 140  */
 141 static u32 psb_accel_2d_copy_direction(int xdir, int ydir)
 142 {
 143         if (xdir < 0)
 144                 return (ydir < 0) ? PSB_2D_COPYORDER_BR2TL :
 145                                                 PSB_2D_COPYORDER_TR2BL;
 146         else
 147                 return (ydir < 0) ? PSB_2D_COPYORDER_BL2TR :
 148                                                 PSB_2D_COPYORDER_TL2BR;
 149 }
 150
 151 /**
 152  *      psb_accel_2d_copy               -       accelerated 2D copy
 153  *      @dev_priv: our DRM device
 154  *      @src_offset in bytes
 155  *      @src_stride in bytes
 156  *      @src_format psb 2D format defines
 157  *      @dst_offset in bytes
 158  *      @dst_stride in bytes
 159  *      @dst_format psb 2D format defines
 160  *      @src_x offset in pixels
 161  *      @src_y offset in pixels
 162  *      @dst_x offset in pixels
 163  *      @dst_y offset in pixels
 164  *      @size_x of the copied area
 165  *      @size_y of the copied area
 166  *
 167  *      Format and issue a 2D accelerated copy command.
 168  */
 169 static int psb_accel_2d_copy(struct drm_psb_private *dev_priv,
 170                              uint32_t src_offset, uint32_t src_stride,
 171                              uint32_t src_format, uint32_t dst_offset,
 172                              uint32_t dst_stride, uint32_t dst_format,
 173                              uint16_t src_x, uint16_t src_y,
 174                              uint16_t dst_x, uint16_t dst_y,
 175                              uint16_t size_x, uint16_t size_y)
 176 {
 177         uint32_t blit_cmd;
 178         uint32_t buffer[10];
 179         uint32_t *buf;
 180         uint32_t direction;
 181
 182         buf = buffer;
 183
 184         direction =
 185             psb_accel_2d_copy_direction(src_x - dst_x, src_y - dst_y);
 186
 187         if (direction == PSB_2D_COPYORDER_BR2TL ||
 188             direction == PSB_2D_COPYORDER_TR2BL) {
 189                 src_x += size_x - 1;
 190                 dst_x += size_x - 1;
 191         }
 192         if (direction == PSB_2D_COPYORDER_BR2TL ||
 193             direction == PSB_2D_COPYORDER_BL2TR) {
 194                 src_y += size_y - 1;
 195                 dst_y += size_y - 1;
 196         }
 197
 198         blit_cmd =
 199             PSB_2D_BLIT_BH |
 200             PSB_2D_ROT_NONE |
 201             PSB_2D_DSTCK_DISABLE |
 202             PSB_2D_SRCCK_DISABLE |
 203             PSB_2D_USE_PAT | PSB_2D_ROP3_SRCCOPY | direction;
 204
 205         *buf++ = PSB_2D_FENCE_BH;
 206         *buf++ =
 207             PSB_2D_DST_SURF_BH | dst_format | (dst_stride <<
 208                                                PSB_2D_DST_STRIDE_SHIFT);
 209         *buf++ = dst_offset;
 210         *buf++ =
 211             PSB_2D_SRC_SURF_BH | src_format | (src_stride <<
 212                                                PSB_2D_SRC_STRIDE_SHIFT);
 213         *buf++ = src_offset;
 214         *buf++ =
 215             PSB_2D_SRC_OFF_BH | (src_x << PSB_2D_SRCOFF_XSTART_SHIFT) |
 216             (src_y << PSB_2D_SRCOFF_YSTART_SHIFT);
 217         *buf++ = blit_cmd;
 218         *buf++ =
 219             (dst_x << PSB_2D_DST_XSTART_SHIFT) | (dst_y <<
 220                                                   PSB_2D_DST_YSTART_SHIFT);
 221         *buf++ =
 222             (size_x << PSB_2D_DST_XSIZE_SHIFT) | (size_y <<
 223                                                   PSB_2D_DST_YSIZE_SHIFT);
 224         *buf++ = PSB_2D_FLUSH_BH;
 225
 226         return psbfb_2d_submit(dev_priv, buffer, buf - buffer);
 227 }
 228
 229 /**
 230  *      psbfb_copyarea_accel    -       copyarea acceleration for /dev/fb
 231  *      @info: our framebuffer
 232  *      @a: copyarea parameters from the framebuffer core
 233  *
 234  *      Perform a 2D copy via the accelerator
 235  */
 236 static void psbfb_copyarea_accel(struct fb_info *info,
 237                                  const struct fb_copyarea *a)
 238 {
 239         struct psb_fbdev *fbdev = info->par;
 240         struct psb_framebuffer *psbfb = &fbdev->pfb;
 241         struct drm_device *dev = psbfb->base.dev;
 242         struct drm_framebuffer *fb = fbdev->psb_fb_helper.fb;
 243         struct drm_psb_private *dev_priv = dev->dev_private;
 244         uint32_t offset;
 245         uint32_t stride;
 246         uint32_t src_format;
 247         uint32_t dst_format;
 248
 249         if (!fb)
 250                 return;
 251
 252         offset = psbfb->gtt->offset;
 253         stride = fb->pitch;
 254
 255         switch (fb->depth) {
 256         case 8:
 257                 src_format = PSB_2D_SRC_332RGB;
 258                 dst_format = PSB_2D_DST_332RGB;
 259                 break;
 260         case 15:
 261                 src_format = PSB_2D_SRC_555RGB;
 262                 dst_format = PSB_2D_DST_555RGB;
 263                 break;
 264         case 16:
 265                 src_format = PSB_2D_SRC_565RGB;
 266                 dst_format = PSB_2D_DST_565RGB;
 267                 break;
 268         case 24:
 269         case 32:
 270                 /* this is wrong but since we don't do blending its okay */
 271                 src_format = PSB_2D_SRC_8888ARGB;
 272                 dst_format = PSB_2D_DST_8888ARGB;
 273                 break;
 274         default:
 275                 /* software fallback */
 276                 cfb_copyarea(info, a);
 277                 return;
 278         }
 279
 280         if (!gma_power_begin(dev, false)) {
 281                 cfb_copyarea(info, a);
 282                 return;
 283         }
 284         psb_accel_2d_copy(dev_priv,
 285                           offset, stride, src_format,
 286                           offset, stride, dst_format,
 287                           a->sx, a->sy, a->dx, a->dy, a->width, a->height);
 288         gma_power_end(dev);
 289 }
 290
 291 /**
 292  *      psbfb_copyarea  -       2D copy interface
 293  *      @info: our framebuffer
 294  *      @region: region to copy
 295  *
 296  *      Copy an area of the framebuffer console either by the accelerator
 297  *      or directly using the cfb helpers according to the request
 298  */
 299 void psbfb_copyarea(struct fb_info *info,
 300                            const struct fb_copyarea *region)
 301 {
 302         if (unlikely(info->state != FBINFO_STATE_RUNNING))
 303                 return;
 304
 305         /* Avoid the 8 pixel erratum */
 306         if (region->width == 8 || region->height == 8 ||
 307                 (info->flags & FBINFO_HWACCEL_DISABLED))
 308                 return cfb_copyarea(info, region);
 309
 310         psbfb_copyarea_accel(info, region);
 311 }
 312
 313 /**
 314  *      psbfb_sync      -       synchronize 2D
 315  *      @info: our framebuffer
 316  *
 317  *      Wait for the 2D engine to quiesce so that we can do CPU
 318  *      access to the framebuffer again
 319  */
 320 int psbfb_sync(struct fb_info *info)
 321 {
 322         struct psb_fbdev *fbdev = info->par;
 323         struct psb_framebuffer *psbfb = &fbdev->pfb;
 324         struct drm_device *dev = psbfb->base.dev;
 325         struct drm_psb_private *dev_priv = dev->dev_private;
 326         unsigned long _end = jiffies + DRM_HZ;
 327         int busy = 0;
 328
 329         /*
 330          * First idle the 2D engine.
 331          */
 332
 333         if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) &&
 334             ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0))
 335                 goto out;
 336
 337         do {
 338                 busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
 339                 cpu_relax();
 340         } while (busy && !time_after_eq(jiffies, _end));
 341
 342         if (busy)
 343                 busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
 344         if (busy)
 345                 goto out;
 346
 347         do {
 348                 busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
 349                                                 _PSB_C2B_STATUS_BUSY) != 0);
 350                 cpu_relax();
 351         } while (busy && !time_after_eq(jiffies, _end));
 352         if (busy)
 353                 busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
 354                                         _PSB_C2B_STATUS_BUSY) != 0);
 355
 356 out:
 357         return (busy) ? -EBUSY : 0;
 358 }