Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: c81db140aa251ebcc92a010e62a2abdfbd7900f4 (plain)
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
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *  sata_promise.h - Promise SATA common definitions and inline funcs
 *
 *  Copyright 2003-2004 Red Hat, Inc.
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/driver-api/libata.rst
 */

#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;
	__le32 *buf32 = (__le32 *) 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__ */