aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/scsi/sata_promise.h
blob: 6ee5e190262de8d55f9689450e8fb08aea67eb77 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/*
 *  sata_promise.h - Promise SATA common definitions and inline funcs
 *
 *  Copyright 2003-2004 Red Hat, Inc.
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 */

#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;
	u32 *buf32 = (u32 *) buf;

	/* 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__ */