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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Google Inc.
*
* 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 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.
*/
#include <console/console.h>
#include <delay.h>
#include <arch/io.h>
#include <soc/iobp.h>
#include <soc/rcba.h>
#define IOBP_RETRY 1000
static inline int iobp_poll(void)
{
unsigned try;
for (try = IOBP_RETRY; try > 0; try--) {
u16 status = RCBA16(IOBPS);
if ((status & IOBPS_READY) == 0)
return 1;
udelay(10);
}
printk(BIOS_ERR, "IOBP: timeout waiting for transaction to complete\n");
return 0;
}
u32 pch_iobp_read(u32 address)
{
u16 status;
if (!iobp_poll())
return 0;
/* Set the address */
RCBA32(IOBPIRI) = address;
/* READ OPCODE */
status = RCBA16(IOBPS);
status &= ~IOBPS_MASK;
status |= IOBPS_READ;
RCBA16(IOBPS) = status;
/* Undocumented magic */
RCBA16(IOBPU) = IOBPU_MAGIC;
/* Set ready bit */
status = RCBA16(IOBPS);
status |= IOBPS_READY;
RCBA16(IOBPS) = status;
if (!iobp_poll())
return 0;
/* Check for successful transaction */
status = RCBA16(IOBPS);
if (status & IOBPS_TX_MASK) {
printk(BIOS_ERR, "IOBP: read 0x%08x failed\n", address);
return 0;
}
/* Read IOBP data */
return RCBA32(IOBPD);
}
void pch_iobp_write(u32 address, u32 data)
{
u16 status;
if (!iobp_poll())
return;
/* Set the address */
RCBA32(IOBPIRI) = address;
/* WRITE OPCODE */
status = RCBA16(IOBPS);
status &= ~IOBPS_MASK;
status |= IOBPS_WRITE;
RCBA16(IOBPS) = status;
RCBA32(IOBPD) = data;
/* Undocumented magic */
RCBA16(IOBPU) = IOBPU_MAGIC;
/* Set ready bit */
status = RCBA16(IOBPS);
status |= IOBPS_READY;
RCBA16(IOBPS) = status;
if (!iobp_poll())
return;
/* Check for successful transaction */
status = RCBA16(IOBPS);
if (status & IOBPS_TX_MASK)
printk(BIOS_ERR, "IOBP: write 0x%08x failed\n", address);
}
void pch_iobp_update(u32 address, u32 andvalue, u32 orvalue)
{
u32 data = pch_iobp_read(address);
/* Update the data */
data &= andvalue;
data |= orvalue;
pch_iobp_write(address, data);
}
void pch_iobp_exec(u32 addr, u16 op_code, u8 route_id, u32 *data, u8 *resp)
{
if (!data || !resp)
return;
*resp = -1;
if (!iobp_poll())
return;
/* RCBA2330[31:0] = Address */
RCBA32(IOBPIRI) = addr;
/* RCBA2338[15:8] = opcode */
RCBA16(IOBPS) = (RCBA16(IOBPS) & 0x00ff) | op_code;
/* RCBA233A[15:8] = 0xf0 RCBA233A[7:0] = Route ID */
RCBA16(IOBPU) = IOBPU_MAGIC | route_id;
if (op_code == IOBP_PCICFG_WRITE)
RCBA32(IOBPD) = *data;
/* Set RCBA2338[0] to trigger IOBP transaction*/
RCBA16(IOBPS) = RCBA16(IOBPS) | 0x1;
if (!iobp_poll())
return;
*resp = (RCBA16(IOBPS) & IOBPS_TX_MASK) >> 1;
*data = RCBA32(IOBPD);
}
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