linux/drivers/ata/sata_promise.h
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   1/*
   2 *  sata_promise.h - Promise SATA common definitions and inline funcs
   3 *
   4 *  Copyright 2003-2004 Red Hat, Inc.
   5 *
   6 *
   7 *  This program is free software; you can redistribute it and/or modify
   8 *  it under the terms of the GNU General Public License as published by
   9 *  the Free Software Foundation; either version 2, or (at your option)
  10 *  any later version.
  11 *
  12 *  This program is distributed in the hope that it will be useful,
  13 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 *  GNU General Public License for more details.
  16 *
  17 *  You should have received a copy of the GNU General Public License
  18 *  along with this program; see the file COPYING.  If not, write to
  19 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  20 *
  21 *
  22 *  libata documentation is available via 'make {ps|pdf}docs',
  23 *  as Documentation/DocBook/libata.*
  24 *
  25 */
  26
  27#ifndef __SATA_PROMISE_H__
  28#define __SATA_PROMISE_H__
  29
  30#include <linux/ata.h>
  31
  32enum pdc_packet_bits {
  33        PDC_PKT_READ            = (1 << 2),
  34        PDC_PKT_NODATA          = (1 << 3),
  35
  36        PDC_PKT_SIZEMASK        = (1 << 7) | (1 << 6) | (1 << 5),
  37        PDC_PKT_CLEAR_BSY       = (1 << 4),
  38        PDC_PKT_WAIT_DRDY       = (1 << 3) | (1 << 4),
  39        PDC_LAST_REG            = (1 << 3),
  40
  41        PDC_REG_DEVCTL          = (1 << 3) | (1 << 2) | (1 << 1),
  42};
  43
  44static inline unsigned int pdc_pkt_header(struct ata_taskfile *tf,
  45                                          dma_addr_t sg_table,
  46                                          unsigned int devno, u8 *buf)
  47{
  48        u8 dev_reg;
  49        __le32 *buf32 = (__le32 *) buf;
  50
  51        /* set control bits (byte 0), zero delay seq id (byte 3),
  52         * and seq id (byte 2)
  53         */
  54        switch (tf->protocol) {
  55        case ATA_PROT_DMA:
  56                if (!(tf->flags & ATA_TFLAG_WRITE))
  57                        buf32[0] = cpu_to_le32(PDC_PKT_READ);
  58                else
  59                        buf32[0] = 0;
  60                break;
  61
  62        case ATA_PROT_NODATA:
  63                buf32[0] = cpu_to_le32(PDC_PKT_NODATA);
  64                break;
  65
  66        default:
  67                BUG();
  68                break;
  69        }
  70
  71        buf32[1] = cpu_to_le32(sg_table);       /* S/G table addr */
  72        buf32[2] = 0;                           /* no next-packet */
  73
  74        if (devno == 0)
  75                dev_reg = ATA_DEVICE_OBS;
  76        else
  77                dev_reg = ATA_DEVICE_OBS | ATA_DEV1;
  78
  79        /* select device */
  80        buf[12] = (1 << 5) | PDC_PKT_CLEAR_BSY | ATA_REG_DEVICE;
  81        buf[13] = dev_reg;
  82
  83        /* device control register */
  84        buf[14] = (1 << 5) | PDC_REG_DEVCTL;
  85        buf[15] = tf->ctl;
  86
  87        return 16;      /* offset of next byte */
  88}
  89
  90static inline unsigned int pdc_pkt_footer(struct ata_taskfile *tf, u8 *buf,
  91                                  unsigned int i)
  92{
  93        if (tf->flags & ATA_TFLAG_DEVICE) {
  94                buf[i++] = (1 << 5) | ATA_REG_DEVICE;
  95                buf[i++] = tf->device;
  96        }
  97
  98        /* and finally the command itself; also includes end-of-pkt marker */
  99        buf[i++] = (1 << 5) | PDC_LAST_REG | ATA_REG_CMD;
 100        buf[i++] = tf->command;
 101
 102        return i;
 103}
 104
 105static inline unsigned int pdc_prep_lba28(struct ata_taskfile *tf, u8 *buf, unsigned int i)
 106{
 107        /* the "(1 << 5)" should be read "(count << 5)" */
 108
 109        /* ATA command block registers */
 110        buf[i++] = (1 << 5) | ATA_REG_FEATURE;
 111        buf[i++] = tf->feature;
 112
 113        buf[i++] = (1 << 5) | ATA_REG_NSECT;
 114        buf[i++] = tf->nsect;
 115
 116        buf[i++] = (1 << 5) | ATA_REG_LBAL;
 117        buf[i++] = tf->lbal;
 118
 119        buf[i++] = (1 << 5) | ATA_REG_LBAM;
 120        buf[i++] = tf->lbam;
 121
 122        buf[i++] = (1 << 5) | ATA_REG_LBAH;
 123        buf[i++] = tf->lbah;
 124
 125        return i;
 126}
 127
 128static inline unsigned int pdc_prep_lba48(struct ata_taskfile *tf, u8 *buf, unsigned int i)
 129{
 130        /* the "(2 << 5)" should be read "(count << 5)" */
 131
 132        /* ATA command block registers */
 133        buf[i++] = (2 << 5) | ATA_REG_FEATURE;
 134        buf[i++] = tf->hob_feature;
 135        buf[i++] = tf->feature;
 136
 137        buf[i++] = (2 << 5) | ATA_REG_NSECT;
 138        buf[i++] = tf->hob_nsect;
 139        buf[i++] = tf->nsect;
 140
 141        buf[i++] = (2 << 5) | ATA_REG_LBAL;
 142        buf[i++] = tf->hob_lbal;
 143        buf[i++] = tf->lbal;
 144
 145        buf[i++] = (2 << 5) | ATA_REG_LBAM;
 146        buf[i++] = tf->hob_lbam;
 147        buf[i++] = tf->lbam;
 148
 149        buf[i++] = (2 << 5) | ATA_REG_LBAH;
 150        buf[i++] = tf->hob_lbah;
 151        buf[i++] = tf->lbah;
 152
 153        return i;
 154}
 155
 156
 157#endif /* __SATA_PROMISE_H__ */
 158
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