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 }