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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"
#undef VERSION /* XXX edid.h has a VERSION too */
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define _PARSE_EDID_
#include "xf86.h"
#include "i830.h"
#include "i830_bios.h"
#include "edid.h"
#define INTEL_BIOS_8(_addr) (bios[_addr])
#define INTEL_BIOS_16(_addr) (bios[_addr] | \
(bios[_addr + 1] << 8))
#define INTEL_BIOS_32(_addr) (bios[_addr] | \
(bios[_addr + 1] << 8) \
(bios[_addr + 2] << 16) \
(bios[_addr + 3] << 24))
/* XXX */
#define INTEL_VBIOS_SIZE (64 * 1024)
static void *
find_section(struct bdb_header *bdb, int section_id)
{
unsigned char *base = (unsigned char *)bdb;
int index = 0;
uint16_t total, current_size;
unsigned char current_id;
/* skip to first section */
index += bdb->header_size;
total = bdb->bdb_size;
/* walk the sections looking for section_id */
while (index < total) {
current_id = *(base + index);
index++;
current_size = *((uint16_t *)(base + index));
index += 2;
if (current_id == section_id)
return base + index;
index += current_size;
}
return NULL;
}
/**
* Returns the BIOS's fixed panel mode.
*
* Note that many BIOSes will have the appropriate tables for a panel even when
* a panel is not attached. Additionally, many BIOSes adjust table sizes or
* offsets, such that this parsing fails. Thus, almost any other method for
* detecting the panel mode is preferable.
*/
static void
parse_panel_data(I830Ptr pI830, struct bdb_header *bdb)
{
struct bdb_lvds_options *lvds_options;
struct bdb_lvds_lfp_data *lvds_lfp_data;
struct bdb_lvds_lfp_data_entry *entry;
DisplayModePtr fixed_mode;
unsigned char *timing_ptr;
/* Defaults if we can't find VBT info */
pI830->lvds_dither = 0;
lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
if (!lvds_options)
return;
pI830->lvds_dither = lvds_options->pixel_dither;
if (lvds_options->panel_type == 0xff)
return;
lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
if (!lvds_lfp_data)
return;
entry = &lvds_lfp_data->data[lvds_options->panel_type];
timing_ptr = (unsigned char *)&entry->dvo_timing;
fixed_mode = xnfalloc(sizeof(DisplayModeRec));
memset(fixed_mode, 0, sizeof(*fixed_mode));
/* Since lvds_bdb_2_fp_edid_dtd is just an EDID detailed timing
* block, pull the contents out using EDID macros.
*/
fixed_mode->HDisplay = _H_ACTIVE(timing_ptr);
fixed_mode->VDisplay = _V_ACTIVE(timing_ptr);
fixed_mode->HSyncStart = fixed_mode->HDisplay +
_H_SYNC_OFF(timing_ptr);
fixed_mode->HSyncEnd = fixed_mode->HSyncStart +
_H_SYNC_WIDTH(timing_ptr);
fixed_mode->HTotal = fixed_mode->HDisplay +
_H_BLANK(timing_ptr);
fixed_mode->VSyncStart = fixed_mode->VDisplay +
_V_SYNC_OFF(timing_ptr);
fixed_mode->VSyncEnd = fixed_mode->VSyncStart +
_V_SYNC_WIDTH(timing_ptr);
fixed_mode->VTotal = fixed_mode->VDisplay +
_V_BLANK(timing_ptr);
fixed_mode->Clock = _PIXEL_CLOCK(timing_ptr) / 1000;
fixed_mode->type = M_T_PREFERRED;
xf86SetModeDefaultName(fixed_mode);
pI830->lvds_fixed_mode = fixed_mode;
}
static void
parse_general_features(I830Ptr pI830, struct bdb_header *bdb)
{
struct bdb_general_features *general;
/* Set sensible defaults in case we can't find the general block */
pI830->tv_present = 1;
general = find_section(bdb, BDB_GENERAL_FEATURES);
if (!general)
return;
pI830->tv_present = general->int_tv_support;
pI830->lvds_use_ssc = general->enable_ssc;
if (pI830->lvds_use_ssc) {
if (IS_I855(pI830))
pI830->lvds_ssc_freq = general->ssc_freq ? 66 : 48;
else
pI830->lvds_ssc_freq = general->ssc_freq ? 100 : 96;
}
}
/**
* i830_bios_init - map VBIOS, find VBT
*
* 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.
*
* Returns 0 on success, nonzero on failure.
*/
int
i830_bios_init(ScrnInfoPtr pScrn)
{
I830Ptr pI830 = I830PTR(pScrn);
struct vbt_header *vbt;
struct bdb_header *bdb;
int vbt_off, bdb_off;
unsigned char *bios;
vbeInfoPtr pVbe;
bios = xalloc(INTEL_VBIOS_SIZE);
if (bios == NULL)
return -1;
pVbe = VBEInit(NULL, pI830->pEnt->index);
if (pVbe != NULL) {
memcpy(bios, xf86int10Addr(pVbe->pInt10,
pVbe->pInt10->BIOSseg << 4),
INTEL_VBIOS_SIZE);
vbeFree (pVbe);
} else {
#if XSERVER_LIBPCIACCESS
pci_device_read_rom (pI830->PciInfo, bios);
#else
xf86ReadPciBIOS(0, pI830->PciTag, 0, bios, INTEL_VBIOS_SIZE);
#endif
}
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(bios);
return -1;
}
vbt = (struct vbt_header *)(bios + vbt_off);
if (memcmp(vbt->signature, "$VBT", 4) != 0) {
xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Bad VBT signature\n");
xfree(bios);
return -1;
}
/* Now that we've found the VBIOS, go scour the VBTs */
bdb_off = vbt_off + vbt->bdb_offset;
bdb = (struct bdb_header *)(bios + bdb_off);
parse_general_features(pI830, bdb);
parse_panel_data(pI830, bdb);
xfree(bios);
return 0;
}
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