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	u32 *buf32 = (u32 *) 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