src/mainboard/tyan/s8226/BiosCallOuts.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2011 Advanced Micro Devices, 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 "AGESA.h"
#include <northbridge/amd/agesa/agesawrapper.h>
#include <northbridge/amd/agesa/BiosCallOuts.h>
#include <arch/io.h>
#include <stdlib.h>

#ifdef __PRE_RAM__
/* These defines are used to select the appropriate socket for the SPD read
 * because this is a multi-socket design.
 */
#define PCI_REG_GPIO_48_47_46_37_CNTRL   (0xA6)
#define PCI_REG_GPIO_52_to_49_CNTRL      (0x50)
#define GPIO_OUT_BIT_GPIO48              (BIT3)
#define GPIO_OUT_BIT_GPIO49              (BIT0)
#define GPIO_OUT_ENABLE_BIT_GPIO48       (BIT7)
#define GPIO_OUT_ENABLE_BIT_GPIO49       (BIT4)

static UINT8 select_socket(UINT8 socket_id)
{
	pci_devfn_t sm_dev       = PCI_DEV(0, 0x14, 0); //SMBUS
	UINT8    value        = 0;
	UINT8    gpio52_to_49 = 0;

	/* Configure GPIO49,48 to select the desired socket
	 * GPIO49,48 control the IDTQS3253 S1,S0
	 *  S1 S0 true table
	 *   0  0   channel 0
	 *   0  1   channel 1
	 *   1  0   channel 2   -  Socket 0
	 *   1  1   channel 3   -  Socket 1
	 * Note: Above is abstracted from Schematic. But actually it seems to be other way.
	 *   1  0   channel 2   -  Socket 1
	 *   1  1   channel 3   -  Socket 0
	 * Note: The DIMMs need to be plugged in from the farthest slot for each channel.
	 */
	gpio52_to_49 = pci_read_config8(sm_dev, PCI_REG_GPIO_52_to_49_CNTRL);
	value  = gpio52_to_49 | GPIO_OUT_BIT_GPIO49; // Output of GPIO49 is always forced to "1"
	value &= ~(GPIO_OUT_ENABLE_BIT_GPIO49); // 0=Output Enabled, 1=Tristate
	pci_write_config8(sm_dev, PCI_REG_GPIO_52_to_49_CNTRL, value);

	value  = pci_read_config8(sm_dev, PCI_REG_GPIO_48_47_46_37_CNTRL);
	value &= ~(GPIO_OUT_BIT_GPIO48);
	value |= (~(socket_id & 1)) << 3;  // Output of GPIO48 is inverse of SocketId
	value &= ~(GPIO_OUT_ENABLE_BIT_GPIO48); // 0=Output Enabled, 1=Tristate
	pci_write_config8(sm_dev, PCI_REG_GPIO_48_47_46_37_CNTRL, value);

	return gpio52_to_49;
}

static void restore_socket(UINT8 original_value)
{
	pci_devfn_t sm_dev = PCI_DEV(0, 0x14, 0); //SMBUS
	pci_write_config8(sm_dev, PCI_REG_GPIO_52_to_49_CNTRL, original_value);

	// TODO: Restore previous GPIO48 configurations?
	//pci_write_config8(sm_dev, PCI_REG_GPIO_48_47_46_37_CNTRL, gpio48_47_46_37_save);
}
#endif

static AGESA_STATUS board_ReadSpd (UINT32 Func, UINTN Data, VOID *ConfigPtr);

const BIOS_CALLOUT_STRUCT BiosCallouts[] =
{
	{AGESA_DO_RESET,			agesa_Reset },
	{AGESA_READ_SPD,			board_ReadSpd },
	{AGESA_READ_SPD_RECOVERY,		agesa_NoopUnsupported },
	{AGESA_RUNFUNC_ONAP,			agesa_RunFuncOnAp },
	{AGESA_GET_IDS_INIT_DATA,		agesa_EmptyIdsInitData },
	{AGESA_HOOKBEFORE_DQS_TRAINING,		agesa_NoopSuccess },
	{AGESA_HOOKBEFORE_DRAM_INIT,		agesa_NoopSuccess },
	{AGESA_HOOKBEFORE_EXIT_SELF_REF,	agesa_NoopSuccess },
};
const int BiosCalloutsLen = ARRAY_SIZE(BiosCallouts);

static AGESA_STATUS board_ReadSpd (UINT32 Func, UINTN Data, VOID *ConfigPtr)
{
	AGESA_STATUS Status;
#ifdef __PRE_RAM__
	UINT8 original_value = 0;

	if (ConfigPtr == NULL)
		return AGESA_ERROR;

	original_value = select_socket(((AGESA_READ_SPD_PARAMS *)ConfigPtr)->SocketId);

	Status = agesa_ReadSpd (Func, Data, ConfigPtr);

	restore_socket(original_value);
#else
	Status = AGESA_UNSUPPORTED;
#endif

	return Status;
}