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/*
* Copyright © 2006 Intel Corporation
*
* 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 (including the next
* paragraph) 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "xf86.h"
#include "xf86_ansic.h"
#include "i830.h"
#include "i830_bios.h"
#define INTEL_BIOS_8(_addr) (pI830->VBIOS[_addr])
#define INTEL_BIOS_16(_addr) (pI830->VBIOS[_addr] | \
(pI830->VBIOS[_addr + 1] << 8))
#define INTEL_BIOS_32(_addr) (pI830->VBIOS[_addr] | \
(pI830->VBIOS[_addr + 1] << 8) \
(pI830->VBIOS[_addr + 2] << 16) \
(pI830->VBIOS[_addr + 3] << 24))
/* XXX */
#define INTEL_VBIOS_SIZE (64 * 1024)
/**
* Loads the Video BIOS and checks that the VBT exists.
*
* VBT existence is a sanity check that is relied on by other i830_bios.c code.
* Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
* feed an updated VBT back through that, compared to what we'll fetch using
* this method of groping around in the BIOS data.
*/
static Bool
i830GetBIOS(ScrnInfoPtr pScrn)
{
I830Ptr pI830 = I830PTR(pScrn);
struct vbt_header *vbt;
int vbt_off;
if (pI830->VBIOS != NULL)
return TRUE;
pI830->VBIOS = xalloc(INTEL_VBIOS_SIZE);
if (pI830->VBIOS == NULL)
return FALSE;
if (pI830->pVbe != NULL) {
memcpy(pI830->VBIOS, (void *)(pI830->pVbe->pInt10->BIOSseg << 4),
INTEL_VBIOS_SIZE);
} else {
xf86ReadPciBIOS(0, pI830->PciTag, 0, pI830->VBIOS, INTEL_VBIOS_SIZE);
}
vbt_off = INTEL_BIOS_16(0x1a);
if (vbt_off >= INTEL_VBIOS_SIZE) {
xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Bad VBT offset: 0x%x\n",
vbt_off);
xfree(pI830->VBIOS);
return FALSE;
}
vbt = (struct vbt_header *)(pI830->VBIOS + vbt_off);
if (memcmp(vbt->signature, "$VBT", 4) != 0) {
xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Bad VBT signature\n");
xfree(pI830->VBIOS);
return FALSE;
}
return TRUE;
}
Bool
i830GetLVDSInfoFromBIOS(ScrnInfoPtr pScrn)
{
I830Ptr pI830 = I830PTR(pScrn);
struct vbt_header *vbt;
struct bdb_header *bdb;
int vbt_off, bdb_block_off, block_size;
if (!i830GetBIOS(pScrn))
return FALSE;
vbt_off = INTEL_BIOS_16(0x1a);
vbt = (struct vbt_header *)(pI830->VBIOS + vbt_off);
bdb = (struct bdb_header *)(pI830->VBIOS + vbt_off + vbt->bdb_offset);
if (memcmp(bdb->signature, "BIOS_DATA_BLOCK ", 16) != 0) {
xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Bad BDB signature\n");
return FALSE;
}
for (bdb_block_off = bdb->header_size; bdb_block_off < bdb->bdb_size;
bdb_block_off += block_size)
{
int start = vbt_off + vbt->bdb_offset + bdb_block_off;
int id;
id = INTEL_BIOS_8(start);
block_size = INTEL_BIOS_16(start + 1) + 3;
xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Found BDB block type %d\n", id);
}
return TRUE;
}
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