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drivers/ata/sata_promise.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* * sata_promise.h - Promise SATA common definitions and inline funcs * * Copyright 2003-2004 Red Hat, Inc. * |
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* libata documentation is available via 'make {ps|pdf}docs',
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* as Documentation/driver-api/libata.rst |
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*/
#ifndef __SATA_PROMISE_H__
#define __SATA_PROMISE_H__
#include <linux/ata.h>
enum pdc_packet_bits {
PDC_PKT_READ = (1 << 2),
PDC_PKT_NODATA = (1 << 3),
PDC_PKT_SIZEMASK = (1 << 7) | (1 << 6) | (1 << 5),
PDC_PKT_CLEAR_BSY = (1 << 4),
PDC_PKT_WAIT_DRDY = (1 << 3) | (1 << 4),
PDC_LAST_REG = (1 << 3),
PDC_REG_DEVCTL = (1 << 3) | (1 << 2) | (1 << 1),
};
static inline unsigned int pdc_pkt_header(struct ata_taskfile *tf,
dma_addr_t sg_table,
unsigned int devno, u8 *buf)
{
u8 dev_reg;
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__le32 *buf32 = (__le32 *) buf; |
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/* set control bits (byte 0), zero delay seq id (byte 3),
* and seq id (byte 2)
*/
switch (tf->protocol) {
case ATA_PROT_DMA:
if (!(tf->flags & ATA_TFLAG_WRITE))
buf32[0] = cpu_to_le32(PDC_PKT_READ);
else
buf32[0] = 0;
break;
case ATA_PROT_NODATA:
buf32[0] = cpu_to_le32(PDC_PKT_NODATA);
break;
default:
BUG();
break;
}
buf32[1] = cpu_to_le32(sg_table); /* S/G table addr */
buf32[2] = 0; /* no next-packet */
if (devno == 0)
dev_reg = ATA_DEVICE_OBS;
else
dev_reg = ATA_DEVICE_OBS | ATA_DEV1;
/* select device */
buf[12] = (1 << 5) | PDC_PKT_CLEAR_BSY | ATA_REG_DEVICE;
buf[13] = dev_reg;
/* device control register */
buf[14] = (1 << 5) | PDC_REG_DEVCTL;
buf[15] = tf->ctl;
return 16; /* offset of next byte */
}
static inline unsigned int pdc_pkt_footer(struct ata_taskfile *tf, u8 *buf,
unsigned int i)
{
if (tf->flags & ATA_TFLAG_DEVICE) {
buf[i++] = (1 << 5) | ATA_REG_DEVICE;
buf[i++] = tf->device;
}
/* and finally the command itself; also includes end-of-pkt marker */
buf[i++] = (1 << 5) | PDC_LAST_REG | ATA_REG_CMD;
buf[i++] = tf->command;
return i;
}
static inline unsigned int pdc_prep_lba28(struct ata_taskfile *tf, u8 *buf, unsigned int i)
{
/* the "(1 << 5)" should be read "(count << 5)" */
/* ATA command block registers */
buf[i++] = (1 << 5) | ATA_REG_FEATURE;
buf[i++] = tf->feature;
buf[i++] = (1 << 5) | ATA_REG_NSECT;
buf[i++] = tf->nsect;
buf[i++] = (1 << 5) | ATA_REG_LBAL;
buf[i++] = tf->lbal;
buf[i++] = (1 << 5) | ATA_REG_LBAM;
buf[i++] = tf->lbam;
buf[i++] = (1 << 5) | ATA_REG_LBAH;
buf[i++] = tf->lbah;
return i;
}
static inline unsigned int pdc_prep_lba48(struct ata_taskfile *tf, u8 *buf, unsigned int i)
{
/* the "(2 << 5)" should be read "(count << 5)" */
/* ATA command block registers */
buf[i++] = (2 << 5) | ATA_REG_FEATURE;
buf[i++] = tf->hob_feature;
buf[i++] = tf->feature;
buf[i++] = (2 << 5) | ATA_REG_NSECT;
buf[i++] = tf->hob_nsect;
buf[i++] = tf->nsect;
buf[i++] = (2 << 5) | ATA_REG_LBAL;
buf[i++] = tf->hob_lbal;
buf[i++] = tf->lbal;
buf[i++] = (2 << 5) | ATA_REG_LBAM;
buf[i++] = tf->hob_lbam;
buf[i++] = tf->lbam;
buf[i++] = (2 << 5) | ATA_REG_LBAH;
buf[i++] = tf->hob_lbah;
buf[i++] = tf->lbah;
return i;
}
#endif /* __SATA_PROMISE_H__ */
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