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/* -------------------------------------------
Copyright (C) 2024-2025, Amlal EL Mahrouss, all rights reserved.
------------------------------------------- */
/**
* @file PIO+Generic.cc
* @author Amlal EL Mahrouss (amlal@nekernel.org)
* @brief ATA driver (PIO mode).
* @version 0.1
* @date 2024-02-02
*
* @copyright Copyright (c) Amlal EL Mahrouss
*
*/
#include <modules/ATA/ATA.h>
#include <ArchKit/ArchKit.h>
#ifdef __ATA_PIO__
using namespace Kernel;
using namespace Kernel::HAL;
/// BUGS: 0
#define kATADataLen 512
STATIC Boolean kATADetected = false;
STATIC Int32 kATADeviceType = kATADeviceCount;
STATIC Char kATAData[kATADataLen] = {0};
STATIC Char kCurrentDiskModel[50] = {"UNKNOWN PIO DRIVE"};
Boolean drv_std_wait_io(UInt16 IO)
{
for (int i = 0; i < 400; i++)
rt_in8(IO + ATA_REG_STATUS);
ATAWaitForIO_Retry:
auto stat_rdy = rt_in8(IO + ATA_REG_STATUS);
if ((stat_rdy & ATA_SR_BSY))
goto ATAWaitForIO_Retry;
ATAWaitForIO_Retry2:
stat_rdy = rt_in8(IO + ATA_REG_STATUS);
if (stat_rdy & ATA_SR_ERR)
return false;
if (!(stat_rdy & ATA_SR_DRDY))
goto ATAWaitForIO_Retry2;
return true;
}
Void drv_std_select(UInt16 Bus)
{
if (Bus == ATA_PRIMARY_IO)
rt_out8(Bus + ATA_REG_HDDEVSEL, ATA_PRIMARY_SEL);
else
rt_out8(Bus + ATA_REG_HDDEVSEL, ATA_SECONDARY_SEL);
}
Boolean drv_std_init(UInt16 Bus, UInt8 Drive, UInt16& OutBus, UInt8& OutMaster)
{
UInt16 IO = Bus;
drv_std_select(IO);
// Bus init, NEIN bit.
rt_out8(IO + ATA_REG_NEIN, 1);
// identify until it's good.
ATAInit_Retry:
auto stat_rdy = rt_in8(IO + ATA_REG_STATUS);
if (stat_rdy & ATA_SR_ERR)
{
return false;
}
if ((stat_rdy & ATA_SR_BSY))
goto ATAInit_Retry;
OutBus = (Bus == ATA_PRIMARY_IO) ? ATA_PRIMARY_IO : ATA_SECONDARY_IO;
OutMaster = (Bus == ATA_PRIMARY_IO) ? ATA_MASTER : ATA_SLAVE;
rt_out8(OutBus + ATA_REG_COMMAND, ATA_CMD_IDENTIFY);
drv_std_wait_io(IO);
/// fetch serial info
/// model, speed, number of sectors...
for (SizeT i = 0ul; i < kATADataLen; ++i)
{
kATAData[i] = HAL::rt_in16(OutBus + ATA_REG_DATA);
}
for (Int32 i = 0; i < 20; i++)
{
kCurrentDiskModel[i * 2] = kATAData[27 + i] >> 8;
kCurrentDiskModel[i * 2 + 1] = kATAData[27 + i + 1] & 0xFF;
}
kCurrentDiskModel[40] = '\0';
kout << "Detect: /dev/ata0" << kendl;
kout << "Drive Model: " << kCurrentDiskModel << kendl;
return true;
}
Void drv_std_read(UInt64 Lba, UInt16 IO, UInt8 Master, Char* Buf, SizeT SectorSz, SizeT Size)
{
Lba /= SectorSz;
UInt8 Command = ((!Master) ? 0xE0 : 0xF0);
drv_std_wait_io(IO);
drv_std_select(IO);
rt_out8(IO + ATA_REG_HDDEVSEL, (Command) | (((Lba) >> 24) & 0x0F));
rt_out8(IO + ATA_REG_SEC_COUNT0, ((Size + SectorSz) / SectorSz));
rt_out8(IO + ATA_REG_LBA0, (Lba)&0xFF);
rt_out8(IO + ATA_REG_LBA1, (Lba) >> 8);
rt_out8(IO + ATA_REG_LBA2, (Lba) >> 16);
rt_out8(IO + ATA_REG_LBA3, (Lba) >> 24);
rt_out8(IO + ATA_REG_COMMAND, ATA_CMD_READ_PIO);
for (SizeT IndexOff = 0; IndexOff < Size; ++IndexOff)
{
drv_std_wait_io(IO);
Buf[IndexOff] = HAL::rt_in16(IO + ATA_REG_DATA);
}
}
Void drv_std_write(UInt64 Lba, UInt16 IO, UInt8 Master, Char* Buf, SizeT SectorSz, SizeT Size)
{
Lba /= SectorSz;
UInt8 Command = ((!Master) ? 0xE0 : 0xF0);
drv_std_wait_io(IO);
drv_std_select(IO);
rt_out8(IO + ATA_REG_HDDEVSEL, (Command) | (((Lba) >> 24) & 0x0F));
rt_out8(IO + ATA_REG_SEC_COUNT0, ((Size + (SectorSz)) / SectorSz));
rt_out8(IO + ATA_REG_LBA0, (Lba)&0xFF);
rt_out8(IO + ATA_REG_LBA1, (Lba) >> 8);
rt_out8(IO + ATA_REG_LBA2, (Lba) >> 16);
rt_out8(IO + ATA_REG_LBA3, (Lba) >> 24);
rt_out8(IO + ATA_REG_COMMAND, ATA_CMD_WRITE_PIO);
for (SizeT IndexOff = 0; IndexOff < Size; ++IndexOff)
{
drv_std_wait_io(IO);
rt_out16(IO + ATA_REG_DATA, Buf[IndexOff]);
}
}
/// @brief is ATA detected?
Boolean drv_std_detected(Void)
{
return kATADetected;
}
/***
@brief Getter, gets the number of sectors inside the drive.
*/
SizeT drv_get_sector_count()
{
return (kATAData[61] << 16) | kATAData[60];
}
/// @brief Get the drive size.
SizeT drv_get_size()
{
return (drv_get_sector_count()) * kATASectorSize;
}
#endif /* ifdef __ATA_PIO__ */
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