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/*
* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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; either version 2 of the
* License, or any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stddef.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <byteswap.h>
#include <gpxe/blockdev.h>
#include <gpxe/process.h>
#include <gpxe/ata.h>
/** @file
*
* ATA block device
*
*/
static inline __attribute__ (( always_inline )) struct ata_device *
block_to_ata ( struct block_device *blockdev ) {
return container_of ( blockdev, struct ata_device, blockdev );
}
/**
* Issue ATA command
*
* @v ata ATA device
* @v command ATA command
* @ret rc Return status code
*/
static inline __attribute__ (( always_inline )) int
ata_command ( struct ata_device *ata, struct ata_command *command ) {
int rc;
DBG ( "ATA cmd %02x dev %02x LBA%s %llx count %04x\n",
command->cb.cmd_stat, command->cb.device,
( command->cb.lba48 ? "48" : "" ),
( unsigned long long ) command->cb.lba.native,
command->cb.count.native );
/* Flag command as in-progress */
command->rc = -EINPROGRESS;
/* Issue ATA command */
if ( ( rc = ata->command ( ata, command ) ) != 0 ) {
/* Something went wrong with the issuing mechanism */
DBG ( "ATA could not issue command: %s\n", strerror ( rc ) );
return rc;
}
/* Wait for command to complete */
while ( command->rc == -EINPROGRESS )
step();
if ( ( rc = command->rc ) != 0 ) {
/* Something went wrong with the command execution */
DBG ( "ATA command failed: %s\n", strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Read block from ATA device
*
* @v blockdev Block device
* @v block LBA block number
* @v count Block count
* @v buffer Data buffer
* @ret rc Return status code
*/
static int ata_read ( struct block_device *blockdev, uint64_t block,
unsigned long count, userptr_t buffer ) {
struct ata_device *ata = block_to_ata ( blockdev );
struct ata_command command;
memset ( &command, 0, sizeof ( command ) );
command.cb.lba.native = block;
command.cb.count.native = count;
command.cb.device = ( ata->device | ATA_DEV_OBSOLETE | ATA_DEV_LBA );
command.cb.lba48 = ata->lba48;
if ( ! ata->lba48 )
command.cb.device |= command.cb.lba.bytes.low_prev;
command.cb.cmd_stat = ( ata->lba48 ? ATA_CMD_READ_EXT : ATA_CMD_READ );
command.data_in = buffer;
return ata_command ( ata, &command );
}
/**
* Write block to ATA device
*
* @v blockdev Block device
* @v block LBA block number
* @v count Block count
* @v buffer Data buffer
* @ret rc Return status code
*/
static int ata_write ( struct block_device *blockdev, uint64_t block,
unsigned long count, userptr_t buffer ) {
struct ata_device *ata = block_to_ata ( blockdev );
struct ata_command command;
memset ( &command, 0, sizeof ( command ) );
command.cb.lba.native = block;
command.cb.count.native = count;
command.cb.device = ( ata->device | ATA_DEV_OBSOLETE | ATA_DEV_LBA );
command.cb.lba48 = ata->lba48;
if ( ! ata->lba48 )
command.cb.device |= command.cb.lba.bytes.low_prev;
command.cb.cmd_stat = ( ata->lba48 ?
ATA_CMD_WRITE_EXT : ATA_CMD_WRITE );
command.data_out = buffer;
return ata_command ( ata, &command );
}
/**
* Identify ATA device
*
* @v blockdev Block device
* @ret rc Return status code
*/
static int ata_identify ( struct block_device *blockdev ) {
struct ata_device *ata = block_to_ata ( blockdev );
struct ata_command command;
struct ata_identity identity;
int rc;
/* Issue IDENTIFY */
memset ( &command, 0, sizeof ( command ) );
command.cb.count.native = 1;
command.cb.device = ( ata->device | ATA_DEV_OBSOLETE | ATA_DEV_LBA );
command.cb.cmd_stat = ATA_CMD_IDENTIFY;
command.data_in = virt_to_user ( &identity );
linker_assert ( sizeof ( identity ) == ATA_SECTOR_SIZE,
__ata_identity_bad_size__ );
if ( ( rc = ata_command ( ata, &command ) ) != 0 )
return rc;
/* Fill in block device parameters */
blockdev->blksize = ATA_SECTOR_SIZE;
if ( identity.supports_lba48 & cpu_to_le16 ( ATA_SUPPORTS_LBA48 ) ) {
ata->lba48 = 1;
blockdev->blocks = le64_to_cpu ( identity.lba48_sectors );
} else {
blockdev->blocks = le32_to_cpu ( identity.lba_sectors );
}
return 0;
}
static struct block_device_operations ata_operations = {
.read = ata_read,
.write = ata_write
};
/**
* Initialise ATA device
*
* @v ata ATA device
* @ret rc Return status code
*
* Initialises an ATA device. The ata_device::command field and the
* @c ATA_FL_SLAVE portion of the ata_device::flags field must already
* be filled in. This function will configure ata_device::blockdev,
* including issuing an IDENTIFY DEVICE call to determine the block
* size and total device size.
*/
int init_atadev ( struct ata_device *ata ) {
/** Fill in read and write methods, and get device capacity */
ata->blockdev.op = &ata_operations;
return ata_identify ( &ata->blockdev );
}
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