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/* ata.h - ATA disk access. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
*
* GRUB 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, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB 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.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GRUB_ATA_HEADER
#define GRUB_ATA_HEADER 1
#include <grub/misc.h>
#include <grub/symbol.h>
/* XXX: For now this only works on i386. */
#include <grub/cpu/io.h>
typedef enum
{
GRUB_ATA_CHS,
GRUB_ATA_LBA,
GRUB_ATA_LBA48
} grub_ata_addressing_t;
#define GRUB_ATA_CH0_PORT1 0x1f0
#define GRUB_ATA_CH1_PORT1 0x170
#define GRUB_ATA_CH0_PORT2 0x3f6
#define GRUB_ATA_CH1_PORT2 0x376
#define GRUB_ATA_REG_DATA 0
#define GRUB_ATA_REG_ERROR 1
#define GRUB_ATA_REG_FEATURES 1
#define GRUB_ATA_REG_SECTORS 2
#define GRUB_ATAPI_REG_IREASON 2
#define GRUB_ATA_REG_SECTNUM 3
#define GRUB_ATA_REG_CYLLSB 4
#define GRUB_ATA_REG_CYLMSB 5
#define GRUB_ATA_REG_LBALOW 3
#define GRUB_ATA_REG_LBAMID 4
#define GRUB_ATAPI_REG_CNTLOW 4
#define GRUB_ATA_REG_LBAHIGH 5
#define GRUB_ATAPI_REG_CNTHIGH 5
#define GRUB_ATA_REG_DISK 6
#define GRUB_ATA_REG_CMD 7
#define GRUB_ATA_REG_STATUS 7
#define GRUB_ATA_REG2_CONTROL 0
#define GRUB_ATA_STATUS_ERR 0x01
#define GRUB_ATA_STATUS_INDEX 0x02
#define GRUB_ATA_STATUS_ECC 0x04
#define GRUB_ATA_STATUS_DRQ 0x08
#define GRUB_ATA_STATUS_SEEK 0x10
#define GRUB_ATA_STATUS_WRERR 0x20
#define GRUB_ATA_STATUS_READY 0x40
#define GRUB_ATA_STATUS_BUSY 0x80
/* ATAPI interrupt reason values (I/O, D/C bits). */
#define GRUB_ATAPI_IREASON_MASK 0x3
#define GRUB_ATAPI_IREASON_DATA_OUT 0x0
#define GRUB_ATAPI_IREASON_CMD_OUT 0x1
#define GRUB_ATAPI_IREASON_DATA_IN 0x2
#define GRUB_ATAPI_IREASON_ERROR 0x3
enum grub_ata_commands
{
GRUB_ATA_CMD_CHECK_POWER_MODE = 0xe5,
GRUB_ATA_CMD_IDENTIFY_DEVICE = 0xec,
GRUB_ATA_CMD_IDENTIFY_PACKET_DEVICE = 0xa1,
GRUB_ATA_CMD_IDLE = 0xe3,
GRUB_ATA_CMD_PACKET = 0xa0,
GRUB_ATA_CMD_READ_SECTORS = 0x20,
GRUB_ATA_CMD_READ_SECTORS_EXT = 0x24,
GRUB_ATA_CMD_SECURITY_FREEZE_LOCK = 0xf5,
GRUB_ATA_CMD_SET_FEATURES = 0xef,
GRUB_ATA_CMD_SLEEP = 0xe6,
GRUB_ATA_CMD_SMART = 0xb0,
GRUB_ATA_CMD_STANDBY_IMMEDIATE = 0xe0,
GRUB_ATA_CMD_WRITE_SECTORS = 0x30,
GRUB_ATA_CMD_WRITE_SECTORS_EXT = 0x34,
};
enum grub_ata_timeout_milliseconds
{
GRUB_ATA_TOUT_STD = 1000, /* 1s standard timeout. */
GRUB_ATA_TOUT_DATA = 10000, /* 10s DATA I/O timeout. */
GRUB_ATA_TOUT_DEV_INIT = 10000, /* Give the device 10s on first try to spinon. */
};
struct grub_ata_device
{
/* IDE port to use. */
int port;
/* IO addresses on which the registers for this device can be
found. */
grub_port_t ioaddress;
grub_port_t ioaddress2;
/* Two devices can be connected to a single cable. Use this field
to select device 0 (commonly known as "master") or device 1
(commonly known as "slave"). */
int device;
/* Addressing methods available for accessing this device. If CHS
is only available, use that. Otherwise use LBA, except for the
high sectors. In that case use LBA48. */
grub_ata_addressing_t addr;
/* Sector count. */
grub_uint64_t size;
/* CHS maximums. */
grub_uint16_t cylinders;
grub_uint16_t heads;
grub_uint16_t sectors_per_track;
/* Set to 0 for ATA, set to 1 for ATAPI. */
int atapi;
int present;
struct grub_ata_device *next;
};
grub_err_t EXPORT_FUNC(grub_ata_wait_not_busy) (struct grub_ata_device *dev,
int milliseconds);
grub_err_t EXPORT_FUNC(grub_ata_wait_drq) (struct grub_ata_device *dev,
int rw, int milliseconds);
void EXPORT_FUNC(grub_ata_pio_read) (struct grub_ata_device *dev,
char *buf, grub_size_t size);
static inline void
grub_ata_regset (struct grub_ata_device *dev, int reg, int val)
{
grub_outb (val, dev->ioaddress + reg);
}
static inline grub_uint8_t
grub_ata_regget (struct grub_ata_device *dev, int reg)
{
return grub_inb (dev->ioaddress + reg);
}
static inline void
grub_ata_regset2 (struct grub_ata_device *dev, int reg, int val)
{
grub_outb (val, dev->ioaddress2 + reg);
}
static inline grub_uint8_t
grub_ata_regget2 (struct grub_ata_device *dev, int reg)
{
return grub_inb (dev->ioaddress2 + reg);
}
static inline grub_err_t
grub_ata_check_ready (struct grub_ata_device *dev)
{
if (grub_ata_regget (dev, GRUB_ATA_REG_STATUS) & GRUB_ATA_STATUS_BUSY)
return grub_ata_wait_not_busy (dev, GRUB_ATA_TOUT_STD);
return GRUB_ERR_NONE;
}
#endif /* ! GRUB_ATA_HEADER */
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