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