pctech.c

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/*
 * PROJECT:     ReactOS ATA Bus Driver
 * LICENSE:     MIT (https://spdx.org/licenses/MIT)
 * PURPOSE:     PC-Tech RZ1000 PCI IDE controller minidriver
 * COPYRIGHT:   Copyright 2026 Dmitry Borisov <di.sean@protonmail.com>
 */
 
/* INCLUDES *******************************************************************/
 
#include "pciidex.h"
 
/* GLOBALS ********************************************************************/
 
#define PCI_DEV_RZ1000      0x1000
#define PCI_DEV_RZ1001      0x1001
 
#define REG_CONFIG          0x40
#define CONFIG_PREFETCH     0x2000
 
/* FUNCTIONS ******************************************************************/
 
/*
 * Errata: Disable the Read-Ahead Mode.
 * https://web.archive.org/web/19961222024423/http://www.intel.com/procs/support/rz1000/rztech.htm
 * https://web.archive.org/web/20250324132451/https://www.mindprod.com/jgloss/eideflaw.html
 */
static
VOID
PcTechControllerStart(
    _In_ PATA_CONTROLLER Controller)
{
    USHORT ConfigReg;
 
    ConfigReg = PciRead16(Controller, REG_CONFIG);
    ConfigReg &= ~CONFIG_PREFETCH;
    PciWrite16(Controller, REG_CONFIG, ConfigReg);
}
 
CODE_SEG("PAGE")
NTSTATUS
PcTechGetControllerProperties(
    _Inout_ PATA_CONTROLLER Controller)
{
    NTSTATUS Status;
    ULONG i;
 
    PAGED_CODE();
    ASSERT(Controller->Pci.VendorID == PCI_VEN_PC_TECH);
 
    if (Controller->Pci.DeviceID != PCI_DEV_RZ1000 && Controller->Pci.DeviceID != PCI_DEV_RZ1001)
        return STATUS_NO_MATCH;
 
    Status = PciIdeCreateChannelData(Controller, 0);
    if (!NT_SUCCESS(Status))
        return Status;
 
    Controller->Start = PcTechControllerStart;
 
    for (i = 0; i < Controller->MaxChannels; ++i)
    {
        PCHANNEL_DATA_PATA ChanData = Controller->Channels[i];
 
        ChanData->ChanInfo &= ~CHANNEL_FLAG_IO32;
    }
 
    return STATUS_SUCCESS;
}