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/*
* Acceleration for the Creator and Creator3D framebuffer - DDC support.
*
* Copyright (C) 2000 David S. Miller (davem@redhat.com)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* DAVID MILLER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
/* $XFree86$ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ffb.h"
#include "ffb_dac.h"
#include "xf86.h"
#include "xf86_OSproc.h"
#include "xf86DDC.h"
/* XXX This needs a lot more work. Only an attempt at the PAC2 version
* XXX is below, and that is untested. The BT498 manual is unclear about
* XXX several details and I must figure them out by trial and error.
*/
/* Wait for the next VSYNC. */
static void
WaitForVSYNC(ffb_dacPtr dac)
{
unsigned int vsap = DACCFG_READ(dac, FFBDAC_CFG_VSAP);
unsigned int vcnt;
vcnt = DACCFG_READ(dac, FFBDAC_CFG_TGVC);
while (vcnt > vsap)
vcnt = DACCFG_READ(dac, FFBDAC_CFG_TGVC);
while (vcnt <= vsap)
vcnt = DACCFG_READ(dac, FFBDAC_CFG_TGVC);
}
/* The manual seems to imply this is needed, but it's really clumsy
* so we can test if it really is a requirement with this.
*/
#define MDATA_NEEDS_BLANK
/* DDC1/DDC2 support */
static unsigned int
FFBDacDdc1Read(ScrnInfoPtr pScrn)
{
FFBPtr pFfb = GET_FFB_FROM_SCRN(pScrn);
ffb_dacPtr dac = pFfb->dac;
unsigned int val;
#ifdef MDATA_NEEDS_BLANK
unsigned int uctrl;
#endif
#ifdef MDATA_NEEDS_BLANK
/* Force a blank of the screen. */
uctrl = DACCFG_READ(dac, FFBDAC_CFG_UCTRL);
DACCFG_WRITE(dac, FFBDAC_CFG_UCTRL,
(uctrl | FFBDAC_UCTRL_ABLANK));
#endif
/* Tristate SCL pin. */
DACCFG_WRITE(dac, FFBDAC_CFG_MPDATA,
FFBDAC_CFG_MPDATA_SCL);
/* Pause until VSYNC is hit. */
WaitForVSYNC(dac);
/* Read the sense line to see what the monitor is driving
* it at.
*/
val = DACCFG_READ(dac, FFBDAC_CFG_MPSENSE);
val = (val & FFBDAC_CFG_MPSENSE_SCL) ? 1 : 0;
/* Stop tristating the SCL pin. */
DACCFG_WRITE(dac, FFBDAC_CFG_MPDATA, 0);
#ifdef MDATA_NEEDS_BLANK
/* Restore UCTRL to unblank the screen. */
DACCFG_WRITE(dac, FFBDAC_CFG_UCTRL, uctrl);
#endif
/* Return the result and we're done. */
return val;
}
static void
FFBI2CGetBits(I2CBusPtr b, int *clock, int *data)
{
FFBPtr pFfb = GET_FFB_FROM_SCRN(xf86Screens[b->scrnIndex]);
ffb_dacPtr dac = pFfb->dac;
unsigned int val;
#ifdef MDATA_NEEDS_BLANK
unsigned int uctrl;
#endif
#ifdef MDATA_NEEDS_BLANK
/* Force a blank of the screen. */
uctrl = DACCFG_READ(dac, FFBDAC_CFG_UCTRL);
DACCFG_WRITE(dac, FFBDAC_CFG_UCTRL,
(uctrl | FFBDAC_UCTRL_ABLANK));
#endif
/* Tristate SCL+SDA pins. */
DACCFG_WRITE(dac, FFBDAC_CFG_MPDATA,
(FFBDAC_CFG_MPDATA_SCL | FFBDAC_CFG_MPDATA_SDA));
/* Read the sense line to see what the monitor is driving
* them at.
*/
val = DACCFG_READ(dac, FFBDAC_CFG_MPSENSE);
*clock = (val & FFBDAC_CFG_MPSENSE_SCL) ? 1 : 0;
*data = (val & FFBDAC_CFG_MPSENSE_SDA) ? 1 : 0;
/* Stop tristating the SCL pin. */
DACCFG_WRITE(dac, FFBDAC_CFG_MPDATA, 0);
#ifdef MDATA_NEEDS_BLANK
/* Restore UCTRL to unblank the screen. */
DACCFG_WRITE(dac, FFBDAC_CFG_UCTRL, uctrl);
#endif
}
static void
FFBI2CPutBits(I2CBusPtr b, int clock, int data)
{
FFBPtr pFfb = GET_FFB_FROM_SCRN(xf86Screens[b->scrnIndex]);
ffb_dacPtr dac = pFfb->dac;
unsigned int val;
#ifdef MDATA_NEEDS_BLANK
unsigned int uctrl;
#endif
val = 0;
if (clock)
val |= FFBDAC_CFG_MPDATA_SCL;
if (data)
val |= FFBDAC_CFG_MPDATA_SDA;
#ifdef MDATA_NEEDS_BLANK
/* Force a blank of the screen. */
uctrl = DACCFG_READ(dac, FFBDAC_CFG_UCTRL);
DACCFG_WRITE(dac, FFBDAC_CFG_UCTRL,
(uctrl | FFBDAC_UCTRL_ABLANK));
#endif
/* Tristate requested pins. */
DACCFG_WRITE(dac, FFBDAC_CFG_MPDATA, val);
#ifdef MDATA_NEEDS_BLANK
/* Restore UCTRL to unblank the screen. */
DACCFG_WRITE(dac, FFBDAC_CFG_UCTRL, uctrl);
#endif
}
Bool
FFBi2cInit(ScrnInfoPtr pScrn)
{
FFBPtr pFfb = GET_FFB_FROM_SCRN(pScrn);
I2CBusPtr I2CPtr;
I2CPtr = xf86CreateI2CBusRec();
if (!I2CPtr)
return FALSE;
pFfb->I2C = I2CPtr;
I2CPtr->BusName = "DDC";
I2CPtr->scrnIndex = pScrn->scrnIndex;
I2CPtr->I2CPutBits = FFBI2CPutBits;
I2CPtr->I2CGetBits = FFBI2CGetBits;
I2CPtr->AcknTimeout = 5;
if (!xf86I2CBusInit(I2CPtr))
return FALSE;
return TRUE;
}
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