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128 lines
3 KiB
C
128 lines
3 KiB
C
/*
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* PROJECT: Xbox HAL
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* LICENSE: GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
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* PURPOSE: Xbox reboot functions
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* COPYRIGHT: Copyright 2004 Lehner Franz (franz@caos.at)
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* Copyright 2019 Stanislav Motylkov (x86corez@gmail.com)
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*
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* REFERENCES: https://xboxdevwiki.net/SMBus
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* https://github.com/XboxDev/cromwell/blob/master/drivers/pci/i2cio.c
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* https://github.com/torvalds/linux/blob/master/drivers/i2c/busses/i2c-amd756.c
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* https://github.com/xqemu/xqemu/blob/master/hw/xbox/smbus_xbox_smc.c
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*/
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/* INCLUDES ******************************************************************/
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#include "halxbox.h"
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/* PRIVATE FUNCTIONS *********************************************************/
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static VOID
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SMBusWriteByte(
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_In_ UCHAR Address,
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_In_ UCHAR Register,
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_In_ UCHAR Data)
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{
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INT Retries = 50;
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/* Wait while bus is busy with any master traffic */
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while (READ_PORT_USHORT((PUSHORT)SMB_GLOBAL_STATUS) & 0x800)
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{
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NOTHING;
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}
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while (Retries--)
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{
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UCHAR b;
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WRITE_PORT_UCHAR((PUCHAR)SMB_HOST_ADDRESS, Address << 1);
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WRITE_PORT_UCHAR((PUCHAR)SMB_HOST_COMMAND, Register);
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WRITE_PORT_UCHAR((PUCHAR)SMB_HOST_DATA, Data);
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/* Clear down all preexisting errors */
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WRITE_PORT_USHORT((PUSHORT)SMB_GLOBAL_STATUS, READ_PORT_USHORT((PUSHORT)SMB_GLOBAL_STATUS));
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/* Let I2C SMBus know we're sending a single byte here */
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WRITE_PORT_UCHAR((PUCHAR)SMB_GLOBAL_ENABLE, 0x1A);
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b = 0;
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while (!(b & 0x36))
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{
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b = READ_PORT_UCHAR((PUCHAR)SMB_GLOBAL_STATUS);
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}
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if (b & 0x10)
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{
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return;
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}
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KeStallExecutionProcessor(1);
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}
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}
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static DECLSPEC_NORETURN
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VOID
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HalpXboxPowerAction(
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_In_ UCHAR Action)
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{
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/* Disable interrupts */
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_disable();
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/* Send the command */
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SMBusWriteByte(SMB_DEVICE_SMC_PIC16LC, SMC_REG_POWER, Action);
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/* Halt the CPU */
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__halt();
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UNREACHABLE;
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}
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DECLSPEC_NORETURN
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VOID
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HalpReboot(VOID)
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{
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HalpXboxPowerAction(SMC_REG_POWER_RESET);
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}
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/* PUBLIC FUNCTIONS **********************************************************/
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#ifndef _MINIHAL_
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/*
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* @implemented
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*/
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VOID
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NTAPI
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HalReturnToFirmware(
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_In_ FIRMWARE_REENTRY Action)
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{
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/* Check what kind of action this is */
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switch (Action)
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{
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/* All recognized actions: call the internal power function */
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case HalHaltRoutine:
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case HalPowerDownRoutine:
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{
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HalpXboxPowerAction(SMC_REG_POWER_SHUTDOWN);
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}
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case HalRestartRoutine:
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{
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HalpXboxPowerAction(SMC_REG_POWER_CYCLE);
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}
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case HalRebootRoutine:
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{
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HalpXboxPowerAction(SMC_REG_POWER_RESET);
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}
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/* Anything else */
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default:
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{
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/* Print message and break */
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DbgPrint("HalReturnToFirmware(%d) called!\n", Action);
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DbgBreakPoint();
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}
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}
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}
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#endif // _MINIHAL_
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/* EOF */
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