drivers/ata/sata_promise.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  *  sata_promise.h - Promise SATA common definitions and inline funcs
   4  *
   5  *  Copyright 2003-2004 Red Hat, Inc.
   6  *
   7  *  libata documentation is available via 'make {ps|pdf}docs',
   8  *  as Documentation/driver-api/libata.rst
   9  */
  10
  11 #ifndef __SATA_PROMISE_H__
  12 #define __SATA_PROMISE_H__
  13
  14 #include <linux/ata.h>
  15
  16 enum pdc_packet_bits {
  17         PDC_PKT_READ            = (1 << 2),
  18         PDC_PKT_NODATA          = (1 << 3),
  19
  20         PDC_PKT_SIZEMASK        = (1 << 7) | (1 << 6) | (1 << 5),
  21         PDC_PKT_CLEAR_BSY       = (1 << 4),
  22         PDC_PKT_WAIT_DRDY       = (1 << 3) | (1 << 4),
  23         PDC_LAST_REG            = (1 << 3),
  24
  25         PDC_REG_DEVCTL          = (1 << 3) | (1 << 2) | (1 << 1),
  26 };
  27
  28 static inline unsigned int pdc_pkt_header(struct ata_taskfile *tf,
  29                                           dma_addr_t sg_table,
  30                                           unsigned int devno, u8 *buf)
  31 {
  32         u8 dev_reg;
  33         __le32 *buf32 = (__le32 *) buf;
  34
  35         /* set control bits (byte 0), zero delay seq id (byte 3),
  36          * and seq id (byte 2)
  37          */
  38         switch (tf->protocol) {
  39         case ATA_PROT_DMA:
  40                 if (!(tf->flags & ATA_TFLAG_WRITE))
  41                         buf32[0] = cpu_to_le32(PDC_PKT_READ);
  42                 else
  43                         buf32[0] = 0;
  44                 break;
  45
  46         case ATA_PROT_NODATA:
  47                 buf32[0] = cpu_to_le32(PDC_PKT_NODATA);
  48                 break;
  49
  50         default:
  51                 BUG();
  52                 break;
  53         }
  54
  55         buf32[1] = cpu_to_le32(sg_table);       /* S/G table addr */
  56         buf32[2] = 0;                           /* no next-packet */
  57
  58         if (devno == 0)
  59                 dev_reg = ATA_DEVICE_OBS;
  60         else
  61                 dev_reg = ATA_DEVICE_OBS | ATA_DEV1;
  62
  63         /* select device */
  64         buf[12] = (1 << 5) | PDC_PKT_CLEAR_BSY | ATA_REG_DEVICE;
  65         buf[13] = dev_reg;
  66
  67         /* device control register */
  68         buf[14] = (1 << 5) | PDC_REG_DEVCTL;
  69         buf[15] = tf->ctl;
  70
  71         return 16;      /* offset of next byte */
  72 }
  73
  74 static inline unsigned int pdc_pkt_footer(struct ata_taskfile *tf, u8 *buf,
  75                                   unsigned int i)
  76 {
  77         if (tf->flags & ATA_TFLAG_DEVICE) {
  78                 buf[i++] = (1 << 5) | ATA_REG_DEVICE;
  79                 buf[i++] = tf->device;
  80         }
  81
  82         /* and finally the command itself; also includes end-of-pkt marker */
  83         buf[i++] = (1 << 5) | PDC_LAST_REG | ATA_REG_CMD;
  84         buf[i++] = tf->command;
  85
  86         return i;
  87 }
  88
  89 static inline unsigned int pdc_prep_lba28(struct ata_taskfile *tf, u8 *buf, unsigned int i)
  90 {
  91         /* the "(1 << 5)" should be read "(count << 5)" */
  92
  93         /* ATA command block registers */
  94         buf[i++] = (1 << 5) | ATA_REG_FEATURE;
  95         buf[i++] = tf->feature;
  96
  97         buf[i++] = (1 << 5) | ATA_REG_NSECT;
  98         buf[i++] = tf->nsect;
  99
 100         buf[i++] = (1 << 5) | ATA_REG_LBAL;
 101         buf[i++] = tf->lbal;
 102
 103         buf[i++] = (1 << 5) | ATA_REG_LBAM;
 104         buf[i++] = tf->lbam;
 105
 106         buf[i++] = (1 << 5) | ATA_REG_LBAH;
 107         buf[i++] = tf->lbah;
 108
 109         return i;
 110 }
 111
 112 static inline unsigned int pdc_prep_lba48(struct ata_taskfile *tf, u8 *buf, unsigned int i)
 113 {
 114         /* the "(2 << 5)" should be read "(count << 5)" */
 115
 116         /* ATA command block registers */
 117         buf[i++] = (2 << 5) | ATA_REG_FEATURE;
 118         buf[i++] = tf->hob_feature;
 119         buf[i++] = tf->feature;
 120
 121         buf[i++] = (2 << 5) | ATA_REG_NSECT;
 122         buf[i++] = tf->hob_nsect;
 123         buf[i++] = tf->nsect;
 124
 125         buf[i++] = (2 << 5) | ATA_REG_LBAL;
 126         buf[i++] = tf->hob_lbal;
 127         buf[i++] = tf->lbal;
 128
 129         buf[i++] = (2 << 5) | ATA_REG_LBAM;
 130         buf[i++] = tf->hob_lbam;
 131         buf[i++] = tf->lbam;
 132
 133         buf[i++] = (2 << 5) | ATA_REG_LBAH;
 134         buf[i++] = tf->hob_lbah;
 135         buf[i++] = tf->lbah;
 136
 137         return i;
 138 }
 139
 140
 141 #endif /* __SATA_PROMISE_H__ */