src/southbridge/intel/bd82x6x/common.c

/* SPDX-License-Identifier: GPL-2.0-only */

#define __SIMPLE_DEVICE__

#include <console/console.h>
#include <delay.h>
#include <device/pci.h>
#include <device/pci_def.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <stdint.h>

#include "pch.h"

int pch_silicon_revision(void)
{
	static int pch_revision_id = -1;

	if (pch_revision_id < 0)
		pch_revision_id = pci_read_config8(PCH_LPC_DEV, PCI_REVISION_ID);

	return pch_revision_id;
}

int pch_silicon_type(void)
{
	static int pch_type = -1;

	if (pch_type < 0)
		pch_type = pci_read_config8(PCH_LPC_DEV, PCI_DEVICE_ID + 1);

	return pch_type;
}

int pch_silicon_supported(int type, int rev)
{
	int cur_type = pch_silicon_type();
	int cur_rev = pch_silicon_revision();

	switch (type) {
	case PCH_TYPE_CPT:
		/* CougarPoint minimum revision */
		if (cur_type == PCH_TYPE_CPT && cur_rev >= rev)
			return 1;
		/* PantherPoint any revision */
		if (cur_type == PCH_TYPE_PPT)
			return 1;
		break;

	case PCH_TYPE_PPT:
		/* PantherPoint minimum revision */
		if (cur_type == PCH_TYPE_PPT && cur_rev >= rev)
			return 1;
		break;
	}

	return 0;
}

#define IOBP_RETRY 1000
static inline int iobp_poll(void)
{
	unsigned int try = IOBP_RETRY;
	u32 data;

	while (try--) {
		data = RCBA32(IOBPS);
		if ((data & 1) == 0)
			return 1;
		udelay(10);
	}

	printk(BIOS_ERR, "IOBP timeout\n");
	return 0;
}

void pch_iobp_update(u32 address, u32 andvalue, u32 orvalue)
{
	u32 data;

	/* Set the address */
	RCBA32(IOBPIRI) = address;

	/* READ OPCODE */
	if (pch_silicon_supported(PCH_TYPE_CPT, PCH_STEP_B0))
		RCBA32(IOBPS) = IOBPS_RW_BX;
	else
		RCBA32(IOBPS) = IOBPS_READ_AX;
	if (!iobp_poll())
		return;

	/* Read IOBP data */
	data = RCBA32(IOBPD);
	if (!iobp_poll())
		return;

	/* Check for successful transaction */
	if ((RCBA32(IOBPS) & 0x6) != 0) {
		printk(BIOS_ERR, "IOBP read 0x%08x failed\n", address);
		return;
	}

	/* Update the data */
	data &= andvalue;
	data |= orvalue;

	/* WRITE OPCODE */
	if (pch_silicon_supported(PCH_TYPE_CPT, PCH_STEP_B0))
		RCBA32(IOBPS) = IOBPS_RW_BX;
	else
		RCBA32(IOBPS) = IOBPS_WRITE_AX;
	if (!iobp_poll())
		return;

	/* Write IOBP data */
	RCBA32(IOBPD) = data;
	if (!iobp_poll())
		return;
}