diff options
Diffstat (limited to 'src/ffb_ddc.c')
| -rw-r--r-- | src/ffb_ddc.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/src/ffb_ddc.c b/src/ffb_ddc.c new file mode 100644 index 0000000..6d1a312 --- /dev/null +++ b/src/ffb_ddc.c @@ -0,0 +1,195 @@ +/* + * 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: xc/programs/Xserver/hw/xfree86/drivers/sunffb/ffb_ddc.c,v 1.1 2000/05/23 04:47:44 dawes Exp $ */ + +#include "ffb.h" + +#include "ffb_dac.h" + +#include "xf86.h" +#include "xf86_OSproc.h" +#include "xf86_ansic.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; +} |