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drm/gma500: Add first piece of blitter code

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Right now, all we need to know about the blitter is that it's not doing
anything that can be messed up when fiddling with MMU mappings.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
This commit is contained in:
Patrik Jakobsson 2014-01-04 20:58:35 +01:00
parent ac1b01b0ba
commit 1c6b5d17d6
3 changed files with 74 additions and 0 deletions
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1
drivers/gpu/drm/gma500/Makefile
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@ -13,6 +13,7 @@ gma500_gfx-y += \
intel_i2c.o \ intel_i2c.o \
intel_gmbus.o \ intel_gmbus.o \
mmu.o \ mmu.o \
blitter.o \
power.o \ power.o \
psb_drv.o \ psb_drv.o \
gma_display.o \ gma_display.o \

51
drivers/gpu/drm/gma500/blitter.c Normal file
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@ -0,0 +1,51 @@
/*
* Copyright (c) 2014, Patrik Jakobsson
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* Authors: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
*/
#include "psb_drv.h"
#include "blitter.h"
#include "psb_reg.h"
/* Wait for the blitter to be completely idle */
int gma_blt_wait_idle(struct drm_psb_private *dev_priv)
{
unsigned long stop = jiffies + HZ;
int busy = 1;
/* NOP for Cedarview */
if (IS_CDV(dev_priv->dev))
return 0;
/* First do a quick check */
if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) &&
((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0))
return 0;
do {
busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
} while (busy && !time_after_eq(jiffies, stop));
if (busy)
return -EBUSY;
do {
busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
_PSB_C2B_STATUS_BUSY) != 0);
} while (busy && !time_after_eq(jiffies, stop));
/* If still busy, we probably have a hang */
return (busy) ? -EBUSY : 0;
}

22
drivers/gpu/drm/gma500/blitter.h Normal file
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@ -0,0 +1,22 @@
/*
* Copyright (c) 2014, Patrik Jakobsson
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* Authors: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
*/
#ifndef __BLITTER_H
#define __BLITTER_H
extern int gma_blt_wait_idle(struct drm_psb_private *dev_priv);
#endif