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
16enum 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
28static 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
74static 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
89static 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
112static 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__ */
142