[PATCH] libata: implement ata_tf_read_block()
Implement ata_tf_read_block(). Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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@ -239,6 +239,49 @@ int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
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return -1;
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}
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/**
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* ata_tf_read_block - Read block address from ATA taskfile
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* @tf: ATA taskfile of interest
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* @dev: ATA device @tf belongs to
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*
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* LOCKING:
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* None.
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*
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* Read block address from @tf. This function can handle all
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* three address formats - LBA, LBA48 and CHS. tf->protocol and
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* flags select the address format to use.
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*
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* RETURNS:
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* Block address read from @tf.
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*/
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u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
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{
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u64 block = 0;
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if (tf->flags & ATA_TFLAG_LBA) {
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if (tf->flags & ATA_TFLAG_LBA48) {
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block |= (u64)tf->hob_lbah << 40;
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block |= (u64)tf->hob_lbam << 32;
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block |= tf->hob_lbal << 24;
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} else
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block |= (tf->device & 0xf) << 24;
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block |= tf->lbah << 16;
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block |= tf->lbam << 8;
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block |= tf->lbal;
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} else {
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u32 cyl, head, sect;
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cyl = tf->lbam | (tf->lbah << 8);
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head = tf->device & 0xf;
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sect = tf->lbal;
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block = (cyl * dev->heads + head) * dev->sectors + sect;
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}
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return block;
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}
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/**
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* ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
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* @pio_mask: pio_mask
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@ -52,6 +52,7 @@ extern int atapi_dmadir;
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extern int libata_fua;
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extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev);
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extern int ata_rwcmd_protocol(struct ata_queued_cmd *qc);
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extern u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev);
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extern void ata_dev_disable(struct ata_device *dev);
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extern void ata_port_flush_task(struct ata_port *ap);
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extern unsigned ata_exec_internal(struct ata_device *dev,
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