xref: /openbmc/linux/drivers/ata/sata_promise.h (revision c82ee6d3)
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 
pdc_pkt_header(struct ata_taskfile * tf,dma_addr_t sg_table,unsigned int devno,u8 * buf)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 
pdc_pkt_footer(struct ata_taskfile * tf,u8 * buf,unsigned int i)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 
pdc_prep_lba28(struct ata_taskfile * tf,u8 * buf,unsigned int i)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 
pdc_prep_lba48(struct ata_taskfile * tf,u8 * buf,unsigned int i)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__ */
142