drivers/gpu/drm/gma500/accel_2d.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /**************************************************************************
   3  * Copyright (c) 2007-2011, Intel Corporation.
   4  * All Rights Reserved.
   5  *
   6  * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   7  * develop this driver.
   8  *
   9  **************************************************************************/
  10
  11 #include <linux/console.h>
  12 #include <linux/delay.h>
  13 #include <linux/errno.h>
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/mm.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/string.h>
  20 #include <linux/tty.h>
  21
  22 #include <drm/drm.h>
  23 #include <drm/drm_crtc.h>
  24 #include <drm/drm_fb_helper.h>
  25 #include <drm/drm_fourcc.h>
  26
  27 #include "psb_drv.h"
  28 #include "psb_reg.h"
  29
  30 /**
  31  *      psb_spank               -       reset the 2D engine
  32  *      @dev_priv: our PSB DRM device
  33  *
  34  *      Soft reset the graphics engine and then reload the necessary registers.
  35  *      We use this at initialisation time but it will become relevant for
  36  *      accelerated X later
  37  */
  38 void psb_spank(struct drm_psb_private *dev_priv)
  39 {
  40         PSB_WSGX32(_PSB_CS_RESET_BIF_RESET | _PSB_CS_RESET_DPM_RESET |
  41                 _PSB_CS_RESET_TA_RESET | _PSB_CS_RESET_USE_RESET |
  42                 _PSB_CS_RESET_ISP_RESET | _PSB_CS_RESET_TSP_RESET |
  43                 _PSB_CS_RESET_TWOD_RESET, PSB_CR_SOFT_RESET);
  44         PSB_RSGX32(PSB_CR_SOFT_RESET);
  45
  46         msleep(1);
  47
  48         PSB_WSGX32(0, PSB_CR_SOFT_RESET);
  49         wmb();
  50         PSB_WSGX32(PSB_RSGX32(PSB_CR_BIF_CTRL) | _PSB_CB_CTRL_CLEAR_FAULT,
  51                    PSB_CR_BIF_CTRL);
  52         wmb();
  53         (void) PSB_RSGX32(PSB_CR_BIF_CTRL);
  54
  55         msleep(1);
  56         PSB_WSGX32(PSB_RSGX32(PSB_CR_BIF_CTRL) & ~_PSB_CB_CTRL_CLEAR_FAULT,
  57                    PSB_CR_BIF_CTRL);
  58         (void) PSB_RSGX32(PSB_CR_BIF_CTRL);
  59         PSB_WSGX32(dev_priv->gtt.gatt_start, PSB_CR_BIF_TWOD_REQ_BASE);
  60 }
  61
  62 /**
  63  *      psb2_2d_wait_available  -       wait for FIFO room
  64  *      @dev_priv: our DRM device
  65  *      @size: size (in dwords) of the command we want to issue
  66  *
  67  *      Wait until there is room to load the FIFO with our data. If the
  68  *      device is not responding then reset it
  69  */
  70 static int psb_2d_wait_available(struct drm_psb_private *dev_priv,
  71                           unsigned size)
  72 {
  73         uint32_t avail = PSB_RSGX32(PSB_CR_2D_SOCIF);
  74         unsigned long t = jiffies + HZ;
  75
  76         while (avail < size) {
  77                 avail = PSB_RSGX32(PSB_CR_2D_SOCIF);
  78                 if (time_after(jiffies, t)) {
  79                         psb_spank(dev_priv);
  80                         return -EIO;
  81                 }
  82         }
  83         return 0;
  84 }
  85
  86 /**
  87  *      psb_2d_submit           -       submit a 2D command
  88  *      @dev_priv: our DRM device
  89  *      @cmdbuf: command to issue
  90  *      @size: length (in dwords)
  91  *
  92  *      Issue one or more 2D commands to the accelerator. This needs to be
  93  *      serialized later when we add the GEM interfaces for acceleration
  94  */
  95 static int psbfb_2d_submit(struct drm_psb_private *dev_priv, uint32_t *cmdbuf,
  96                                                                 unsigned size)
  97 {
  98         int ret = 0;
  99         int i;
 100         unsigned submit_size;
 101         unsigned long flags;
 102
 103         spin_lock_irqsave(&dev_priv->lock_2d, flags);
 104         while (size > 0) {
 105                 submit_size = (size < 0x60) ? size : 0x60;
 106                 size -= submit_size;
 107                 ret = psb_2d_wait_available(dev_priv, submit_size);
 108                 if (ret)
 109                         break;
 110
 111                 submit_size <<= 2;
 112
 113                 for (i = 0; i < submit_size; i += 4)
 114                         PSB_WSGX32(*cmdbuf++, PSB_SGX_2D_SLAVE_PORT + i);
 115
 116                 (void)PSB_RSGX32(PSB_SGX_2D_SLAVE_PORT + i - 4);
 117         }
 118         spin_unlock_irqrestore(&dev_priv->lock_2d, flags);
 119         return ret;
 120 }
 121
 122
 123 /**
 124  *      psb_accel_2d_copy_direction     -       compute blit order
 125  *      @xdir: X direction of move
 126  *      @ydir: Y direction of move
 127  *
 128  *      Compute the correct order setings to ensure that an overlapping blit
 129  *      correctly copies all the pixels.
 130  */
 131 static u32 psb_accel_2d_copy_direction(int xdir, int ydir)
 132 {
 133         if (xdir < 0)
 134                 return (ydir < 0) ? PSB_2D_COPYORDER_BR2TL :
 135                                                 PSB_2D_COPYORDER_TR2BL;
 136         else
 137                 return (ydir < 0) ? PSB_2D_COPYORDER_BL2TR :
 138                                                 PSB_2D_COPYORDER_TL2BR;
 139 }
 140
 141 /**
 142  *      psb_accel_2d_copy               -       accelerated 2D copy
 143  *      @dev_priv: our DRM device
 144  *      @src_offset in bytes
 145  *      @src_stride in bytes
 146  *      @src_format psb 2D format defines
 147  *      @dst_offset in bytes
 148  *      @dst_stride in bytes
 149  *      @dst_format psb 2D format defines
 150  *      @src_x offset in pixels
 151  *      @src_y offset in pixels
 152  *      @dst_x offset in pixels
 153  *      @dst_y offset in pixels
 154  *      @size_x of the copied area
 155  *      @size_y of the copied area
 156  *
 157  *      Format and issue a 2D accelerated copy command.
 158  */
 159 static int psb_accel_2d_copy(struct drm_psb_private *dev_priv,
 160                              uint32_t src_offset, uint32_t src_stride,
 161                              uint32_t src_format, uint32_t dst_offset,
 162                              uint32_t dst_stride, uint32_t dst_format,
 163                              uint16_t src_x, uint16_t src_y,
 164                              uint16_t dst_x, uint16_t dst_y,
 165                              uint16_t size_x, uint16_t size_y)
 166 {
 167         uint32_t blit_cmd;
 168         uint32_t buffer[10];
 169         uint32_t *buf;
 170         uint32_t direction;
 171
 172         buf = buffer;
 173
 174         direction =
 175             psb_accel_2d_copy_direction(src_x - dst_x, src_y - dst_y);
 176
 177         if (direction == PSB_2D_COPYORDER_BR2TL ||
 178             direction == PSB_2D_COPYORDER_TR2BL) {
 179                 src_x += size_x - 1;
 180                 dst_x += size_x - 1;
 181         }
 182         if (direction == PSB_2D_COPYORDER_BR2TL ||
 183             direction == PSB_2D_COPYORDER_BL2TR) {
 184                 src_y += size_y - 1;
 185                 dst_y += size_y - 1;
 186         }
 187
 188         blit_cmd =
 189             PSB_2D_BLIT_BH |
 190             PSB_2D_ROT_NONE |
 191             PSB_2D_DSTCK_DISABLE |
 192             PSB_2D_SRCCK_DISABLE |
 193             PSB_2D_USE_PAT | PSB_2D_ROP3_SRCCOPY | direction;
 194
 195         *buf++ = PSB_2D_FENCE_BH;
 196         *buf++ =
 197             PSB_2D_DST_SURF_BH | dst_format | (dst_stride <<
 198                                                PSB_2D_DST_STRIDE_SHIFT);
 199         *buf++ = dst_offset;
 200         *buf++ =
 201             PSB_2D_SRC_SURF_BH | src_format | (src_stride <<
 202                                                PSB_2D_SRC_STRIDE_SHIFT);
 203         *buf++ = src_offset;
 204         *buf++ =
 205             PSB_2D_SRC_OFF_BH | (src_x << PSB_2D_SRCOFF_XSTART_SHIFT) |
 206             (src_y << PSB_2D_SRCOFF_YSTART_SHIFT);
 207         *buf++ = blit_cmd;
 208         *buf++ =
 209             (dst_x << PSB_2D_DST_XSTART_SHIFT) | (dst_y <<
 210                                                   PSB_2D_DST_YSTART_SHIFT);
 211         *buf++ =
 212             (size_x << PSB_2D_DST_XSIZE_SHIFT) | (size_y <<
 213                                                   PSB_2D_DST_YSIZE_SHIFT);
 214         *buf++ = PSB_2D_FLUSH_BH;
 215
 216         return psbfb_2d_submit(dev_priv, buffer, buf - buffer);
 217 }
 218
 219 /**
 220  *      psbfb_copyarea_accel    -       copyarea acceleration for /dev/fb
 221  *      @info: our framebuffer
 222  *      @a: copyarea parameters from the framebuffer core
 223  *
 224  *      Perform a 2D copy via the accelerator
 225  */
 226 static void psbfb_copyarea_accel(struct fb_info *info,
 227                                  const struct fb_copyarea *a)
 228 {
 229         struct drm_fb_helper *fb_helper = info->par;
 230         struct drm_framebuffer *fb = fb_helper->fb;
 231         struct drm_device *dev;
 232         struct drm_psb_private *dev_priv;
 233         uint32_t offset;
 234         uint32_t stride;
 235         uint32_t src_format;
 236         uint32_t dst_format;
 237
 238         if (!fb)
 239                 return;
 240
 241         dev = fb->dev;
 242         dev_priv = dev->dev_private;
 243         offset = to_gtt_range(fb->obj[0])->offset;
 244         stride = fb->pitches[0];
 245
 246         switch (fb->format->depth) {
 247         case 8:
 248                 src_format = PSB_2D_SRC_332RGB;
 249                 dst_format = PSB_2D_DST_332RGB;
 250                 break;
 251         case 15:
 252                 src_format = PSB_2D_SRC_555RGB;
 253                 dst_format = PSB_2D_DST_555RGB;
 254                 break;
 255         case 16:
 256                 src_format = PSB_2D_SRC_565RGB;
 257                 dst_format = PSB_2D_DST_565RGB;
 258                 break;
 259         case 24:
 260         case 32:
 261                 /* this is wrong but since we don't do blending its okay */
 262                 src_format = PSB_2D_SRC_8888ARGB;
 263                 dst_format = PSB_2D_DST_8888ARGB;
 264                 break;
 265         default:
 266                 /* software fallback */
 267                 drm_fb_helper_cfb_copyarea(info, a);
 268                 return;
 269         }
 270
 271         if (!gma_power_begin(dev, false)) {
 272                 drm_fb_helper_cfb_copyarea(info, a);
 273                 return;
 274         }
 275         psb_accel_2d_copy(dev_priv,
 276                           offset, stride, src_format,
 277                           offset, stride, dst_format,
 278                           a->sx, a->sy, a->dx, a->dy, a->width, a->height);
 279         gma_power_end(dev);
 280 }
 281
 282 /**
 283  *      psbfb_copyarea  -       2D copy interface
 284  *      @info: our framebuffer
 285  *      @region: region to copy
 286  *
 287  *      Copy an area of the framebuffer console either by the accelerator
 288  *      or directly using the cfb helpers according to the request
 289  */
 290 void psbfb_copyarea(struct fb_info *info,
 291                            const struct fb_copyarea *region)
 292 {
 293         if (unlikely(info->state != FBINFO_STATE_RUNNING))
 294                 return;
 295
 296         /* Avoid the 8 pixel erratum */
 297         if (region->width == 8 || region->height == 8 ||
 298                 (info->flags & FBINFO_HWACCEL_DISABLED))
 299                 return drm_fb_helper_cfb_copyarea(info, region);
 300
 301         psbfb_copyarea_accel(info, region);
 302 }
 303
 304 /**
 305  *      psbfb_sync      -       synchronize 2D
 306  *      @info: our framebuffer
 307  *
 308  *      Wait for the 2D engine to quiesce so that we can do CPU
 309  *      access to the framebuffer again
 310  */
 311 int psbfb_sync(struct fb_info *info)
 312 {
 313         struct drm_fb_helper *fb_helper = info->par;
 314         struct drm_framebuffer *fb = fb_helper->fb;
 315         struct drm_device *dev = fb->dev;
 316         struct drm_psb_private *dev_priv = dev->dev_private;
 317         unsigned long _end = jiffies + HZ;
 318         int busy = 0;
 319         unsigned long flags;
 320
 321         spin_lock_irqsave(&dev_priv->lock_2d, flags);
 322         /*
 323          * First idle the 2D engine.
 324          */
 325
 326         if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) &&
 327             ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0))
 328                 goto out;
 329
 330         do {
 331                 busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
 332                 cpu_relax();
 333         } while (busy && !time_after_eq(jiffies, _end));
 334
 335         if (busy)
 336                 busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
 337         if (busy)
 338                 goto out;
 339
 340         do {
 341                 busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
 342                                                 _PSB_C2B_STATUS_BUSY) != 0);
 343                 cpu_relax();
 344         } while (busy && !time_after_eq(jiffies, _end));
 345         if (busy)
 346                 busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
 347                                         _PSB_C2B_STATUS_BUSY) != 0);
 348
 349 out:
 350         spin_unlock_irqrestore(&dev_priv->lock_2d, flags);
 351         return (busy) ? -EBUSY : 0;
 352 }