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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Vladimir Serbinenko <phcoder@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2, or (at your option)
* any later verion of the License.
*
* This program is distributed in the hope that 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include <arch/io.h>
#include <console/console.h>
#include <delay.h>
#include "i915_reg.h"
#include "edid.h"
static void wait_rdy(u8 *mmio)
{
unsigned try = 100;
while (try--) {
if (read32(mmio + 8) & (1 << 11))
return;
udelay(10);
}
}
void intel_gmbus_read_edid(u8 *mmio, u8 bus, u8 slave, u8 *edid, u32 edid_size)
{
int i;
slave &= 0x7f;
edid_size &= 0x1fc;
wait_rdy(mmio);
/* 100 KHz, hold 0ns, */
write32(mmio + 4 * 0, bus);
wait_rdy(mmio);
/* Ensure index bits are disabled. */
write32(mmio + 4 * 5, 0);
write32(mmio + 4 * 1, 0x46000000 | (slave << 1));
wait_rdy(mmio);
/* Ensure index bits are disabled. */
write32(mmio + 4 * 5, 0);
write32(mmio + 4 * 1, 0x4a000001 | (slave << 1)
| (edid_size << 16));
for (i = 0; i < edid_size / 4; i++) {
u32 reg32;
wait_rdy(mmio);
reg32 = read32(mmio + 4 * 3);
edid[4 * i] = reg32 & 0xff;
edid[4 * i + 1] = (reg32 >> 8) & 0xff;
edid[4 * i + 2] = (reg32 >> 16) & 0xff;
edid[4 * i + 3] = (reg32 >> 24) & 0xff;
}
wait_rdy(mmio);
write32(mmio + 4 * 1, 0x4a800000 | (slave << 1));
wait_rdy(mmio);
write32(mmio + 4 * 0, 0x48000000);
write32(mmio + 4 * 2, 0x00008000);
printk (BIOS_SPEW, "EDID:\n");
for (i = 0; i < 128; i++) {
printk (BIOS_SPEW, "%02x ", edid[i]);
if ((i & 0xf) == 0xf)
printk (BIOS_SPEW, "\n");
}
}
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