Added (untested) support for ATA devices. This code should be generic

enough to support both real IDE chipsets and AoE.

1 files changed, 169 insertions, 0 deletions

diff --git a/src/drivers/block/ata.c b/src/drivers/block/ata.c
new file mode 100644
index 00000000..0e4c7792
--- /dev/null
+++ b/src/drivers/block/ata.c
@@ -0,0 +1,169 @@
+/*
+ * 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.
+ */
+
+#include <stddef.h>
+#include <string.h>
+#include <byteswap.h>
+#include <gpxe/blockdev.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 ) {
+	DBG ( "ATA cmd %02x dev %02x fl %02x LBA %llx count %04x\n",
+	      command.cb.cmd_stat, command.cb.device, command.cb.flags,
+	      ( unsigned long long ) command.cb.lba.native,
+	      command.cb.count.native );
+
+	return ata->command ( ata, command );	
+}
+
+/**
+ * Read block from / write block to ATA device
+ *
+ * @v write		Write flag (ATA_FL_WRITE or 0)
+ * @v blockdev		Block device
+ * @v block		LBA block number
+ * @v count		Block count
+ * @v buffer		Data buffer
+ * @ret rc		Return status code
+ */
+static __attribute__ (( regparm ( 1 ) )) int
+ata_rw ( int 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;
+	int lba48 = ( ata->flags & ATA_FL_LBA48 );
+
+	memset ( &command, 0, sizeof ( command ) );
+	command.cb.lba.native = block;
+	command.cb.count.native = count;
+	command.cb.device = ( ata->flags | ATA_DEV_OBSOLETE | ATA_DEV_LBA );
+	command.cb.flags = ( ata->flags | write );
+	command.cb.cmd_stat = ( write ? ATA_CMD_WRITE : ATA_CMD_READ );
+	if ( lba48 ) {
+		command.cb.cmd_stat |= ATA_CMD_EXT;
+	} else {
+		command.cb.device |= command.cb.lba.bytes.low_prev;
+	}
+	command.data = buffer;
+	command.data_len = ( count * blockdev->blksize );
+	return ata_command ( ata, &command );
+}
+
+/**
+ * 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 ) {
+	/* Pass through to ata_rw().  Since ata_rw is regparm(1), this
+	 * is extremely efficient; just a mov and a jmp.
+	 */
+	return ata_rw ( 0, blockdev, block, count, buffer );
+}
+
+/**
+ * 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 ) {
+	/* Pass through to ata_rw().  Since ata_rw is regparm(1), this
+	 * is extremely efficient; just a mov and a jmp.
+	 */
+	return ata_rw ( ATA_FL_WRITE, blockdev, block, count, buffer );
+}
+
+/**
+ * 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.device = ( ata->flags | ATA_DEV_OBSOLETE | ATA_DEV_LBA );
+	command.cb.cmd_stat = ATA_CMD_IDENTIFY;
+	command.data = virt_to_user ( &identity );
+	command.data_len = sizeof ( identity );
+	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->flags |= ATA_FL_LBA48;
+		blockdev->blocks = le64_to_cpu ( identity.lba48_sectors );
+	} else {
+		blockdev->blocks = le32_to_cpu ( identity.lba_sectors );
+	}
+	return 0;
+}
+
+/**
+ * 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.read = ata_read;
+	ata->blockdev.write = ata_write;
+	return ata_identify ( &ata->blockdev );
+}