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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <stdlib.h>
#include <arch/io.h>
#include <console/console.h>
#include <device/device.h>
#include <delay.h>
#include <OEM.h> /* SMBUS0_BASE_ADDRESS */
#include <Porting.h>
#include <AGESA.h>
#include <northbridge/amd/agesa/dimmSpd.h>
#include "sema.h"
/* Write data block to slave on SMBUS0. */
#define SMB0_STATUS ((SMBUS0_BASE_ADDRESS) + 0)
#define SMB0_CONTROL ((SMBUS0_BASE_ADDRESS) + 2)
#define SMB0_HOSTCMD ((SMBUS0_BASE_ADDRESS) + 3)
#define SMB0_ADDRESS ((SMBUS0_BASE_ADDRESS) + 4)
#define SMB0_DATA0 ((SMBUS0_BASE_ADDRESS) + 5)
#define SMB0_BLOCKDATA ((SMBUS0_BASE_ADDRESS) + 7)
static int smb_write_blk(u8 slave, u8 command, u8 length, const u8 *data)
{
__outbyte(SMB0_STATUS, 0x1E); // clear error status
__outbyte(SMB0_ADDRESS, slave & ~1); // slave addr + direction = out
__outbyte(SMB0_HOSTCMD, command); // or destination offset
__outbyte(SMB0_DATA0, length); // sent before data
__inbyte(SMB0_CONTROL); // reset block data array
while (length--)
__outbyte(SMB0_BLOCKDATA, *(data++));
__outbyte(SMB0_CONTROL, 0x54); // execute block write, no IRQ
while (__inbyte(SMB0_STATUS) == 0x01); // busy, no errors
return __inbyte(SMB0_STATUS) ^ 0x02; // 0x02 = completed, no errors
}
#define RETRY_COUNT 100
/* Use of mdelay() here would fail in romstage. */
static void early_mdelay(int msecs)
{
while (msecs--) {
int i;
for (i = 0; i < 1000; i++)
inb(0x80);
}
}
int sema_send_alive(void)
{
const u8 i_am_alive[] = { 0x03 };
int i, j = 0;
char one_spd_byte;
/* Fake read just to setup SMBUS controller. */
if (ENV_ROMSTAGE)
smbus_readSpd(0xa0, &one_spd_byte, 1);
/* Notify the SMC we're alive and kicking, or after a while it will
* effect a power cycle and switch to the alternate BIOS chip.
* Should be done as late as possible. */
printk(BIOS_CRIT, "Sending BIOS alive message... ");
do {
i = smb_write_blk(0x50, 0x25, sizeof(i_am_alive), i_am_alive);
early_mdelay(25);
} while ((++j < RETRY_COUNT) && i);
if (j == RETRY_COUNT) {
printk(BIOS_INFO, "failed\n");
return -1;
}
printk(BIOS_CRIT, "took %d tries\n", j);
return 0;
}
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