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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Marvell 88E6xxx Switch Global 2 Registers support
4 *
5 * Copyright (c) 2008 Marvell Semiconductor
6 *
7 * Copyright (c) 2016-2017 Savoir-faire Linux Inc.
8 * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
9 *
10 * Copyright (c) 2017 National Instruments
11 * Brandon Streiff <brandon.streiff@ni.com>
12 */
13
14#include <linux/bitfield.h>
15
16#include "global2.h"
17
18/* Offset 0x16: AVB Command Register
19 * Offset 0x17: AVB Data Register
20 *
21 * There are two different versions of this register interface:
22 * "6352": 3-bit "op" field, 4-bit "port" field.
23 * "6390": 2-bit "op" field, 5-bit "port" field.
24 *
25 * The "op" codes are different between the two, as well as the special
26 * port fields for global PTP and TAI configuration.
27 */
28
29/* mv88e6xxx_g2_avb_read -- Read one or multiple 16-bit words.
30 * The hardware supports snapshotting up to four contiguous registers.
31 */
32static int mv88e6xxx_g2_avb_wait(struct mv88e6xxx_chip *chip)
33{
34 int bit = __bf_shf(MV88E6352_G2_AVB_CMD_BUSY);
35
36 return mv88e6xxx_g2_wait_bit(chip, MV88E6352_G2_AVB_CMD, bit, 0);
37}
38
39static int mv88e6xxx_g2_avb_read(struct mv88e6xxx_chip *chip, u16 readop,
40 u16 *data, int len)
41{
42 int err;
43 int i;
44
45 err = mv88e6xxx_g2_avb_wait(chip);
46 if (err)
47 return err;
48
49 /* Hardware can only snapshot four words. */
50 if (len > 4)
51 return -E2BIG;
52
53 err = mv88e6xxx_g2_write(chip, MV88E6352_G2_AVB_CMD,
54 MV88E6352_G2_AVB_CMD_BUSY | readop);
55 if (err)
56 return err;
57
58 err = mv88e6xxx_g2_avb_wait(chip);
59 if (err)
60 return err;
61
62 for (i = 0; i < len; ++i) {
63 err = mv88e6xxx_g2_read(chip, MV88E6352_G2_AVB_DATA,
64 &data[i]);
65 if (err)
66 return err;
67 }
68
69 return 0;
70}
71
72/* mv88e6xxx_g2_avb_write -- Write one 16-bit word. */
73static int mv88e6xxx_g2_avb_write(struct mv88e6xxx_chip *chip, u16 writeop,
74 u16 data)
75{
76 int err;
77
78 err = mv88e6xxx_g2_avb_wait(chip);
79 if (err)
80 return err;
81
82 err = mv88e6xxx_g2_write(chip, MV88E6352_G2_AVB_DATA, data);
83 if (err)
84 return err;
85
86 err = mv88e6xxx_g2_write(chip, MV88E6352_G2_AVB_CMD,
87 MV88E6352_G2_AVB_CMD_BUSY | writeop);
88
89 return mv88e6xxx_g2_avb_wait(chip);
90}
91
92static int mv88e6352_g2_avb_port_ptp_read(struct mv88e6xxx_chip *chip,
93 int port, int addr, u16 *data,
94 int len)
95{
96 u16 readop = (len == 1 ? MV88E6352_G2_AVB_CMD_OP_READ :
97 MV88E6352_G2_AVB_CMD_OP_READ_INCR) |
98 (port << 8) | (MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) |
99 addr;
100
101 return mv88e6xxx_g2_avb_read(chip, readop, data, len);
102}
103
104static int mv88e6352_g2_avb_port_ptp_write(struct mv88e6xxx_chip *chip,
105 int port, int addr, u16 data)
106{
107 u16 writeop = MV88E6352_G2_AVB_CMD_OP_WRITE | (port << 8) |
108 (MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) | addr;
109
110 return mv88e6xxx_g2_avb_write(chip, writeop, data);
111}
112
113static int mv88e6352_g2_avb_ptp_read(struct mv88e6xxx_chip *chip, int addr,
114 u16 *data, int len)
115{
116 return mv88e6352_g2_avb_port_ptp_read(chip,
117 MV88E6352_G2_AVB_CMD_PORT_PTPGLOBAL,
118 addr, data, len);
119}
120
121static int mv88e6352_g2_avb_ptp_write(struct mv88e6xxx_chip *chip, int addr,
122 u16 data)
123{
124 return mv88e6352_g2_avb_port_ptp_write(chip,
125 MV88E6352_G2_AVB_CMD_PORT_PTPGLOBAL,
126 addr, data);
127}
128
129static int mv88e6352_g2_avb_tai_read(struct mv88e6xxx_chip *chip, int addr,
130 u16 *data, int len)
131{
132 return mv88e6352_g2_avb_port_ptp_read(chip,
133 MV88E6352_G2_AVB_CMD_PORT_TAIGLOBAL,
134 addr, data, len);
135}
136
137static int mv88e6352_g2_avb_tai_write(struct mv88e6xxx_chip *chip, int addr,
138 u16 data)
139{
140 return mv88e6352_g2_avb_port_ptp_write(chip,
141 MV88E6352_G2_AVB_CMD_PORT_TAIGLOBAL,
142 addr, data);
143}
144
145const struct mv88e6xxx_avb_ops mv88e6352_avb_ops = {
146 .port_ptp_read = mv88e6352_g2_avb_port_ptp_read,
147 .port_ptp_write = mv88e6352_g2_avb_port_ptp_write,
148 .ptp_read = mv88e6352_g2_avb_ptp_read,
149 .ptp_write = mv88e6352_g2_avb_ptp_write,
150 .tai_read = mv88e6352_g2_avb_tai_read,
151 .tai_write = mv88e6352_g2_avb_tai_write,
152};
153
154static int mv88e6165_g2_avb_tai_read(struct mv88e6xxx_chip *chip, int addr,
155 u16 *data, int len)
156{
157 return mv88e6352_g2_avb_port_ptp_read(chip,
158 MV88E6165_G2_AVB_CMD_PORT_PTPGLOBAL,
159 addr, data, len);
160}
161
162static int mv88e6165_g2_avb_tai_write(struct mv88e6xxx_chip *chip, int addr,
163 u16 data)
164{
165 return mv88e6352_g2_avb_port_ptp_write(chip,
166 MV88E6165_G2_AVB_CMD_PORT_PTPGLOBAL,
167 addr, data);
168}
169
170const struct mv88e6xxx_avb_ops mv88e6165_avb_ops = {
171 .port_ptp_read = mv88e6352_g2_avb_port_ptp_read,
172 .port_ptp_write = mv88e6352_g2_avb_port_ptp_write,
173 .ptp_read = mv88e6352_g2_avb_ptp_read,
174 .ptp_write = mv88e6352_g2_avb_ptp_write,
175 .tai_read = mv88e6165_g2_avb_tai_read,
176 .tai_write = mv88e6165_g2_avb_tai_write,
177};
178
179static int mv88e6390_g2_avb_port_ptp_read(struct mv88e6xxx_chip *chip,
180 int port, int addr, u16 *data,
181 int len)
182{
183 u16 readop = (len == 1 ? MV88E6390_G2_AVB_CMD_OP_READ :
184 MV88E6390_G2_AVB_CMD_OP_READ_INCR) |
185 (port << 8) | (MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) |
186 addr;
187
188 return mv88e6xxx_g2_avb_read(chip, readop, data, len);
189}
190
191static int mv88e6390_g2_avb_port_ptp_write(struct mv88e6xxx_chip *chip,
192 int port, int addr, u16 data)
193{
194 u16 writeop = MV88E6390_G2_AVB_CMD_OP_WRITE | (port << 8) |
195 (MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) | addr;
196
197 return mv88e6xxx_g2_avb_write(chip, writeop, data);
198}
199
200static int mv88e6390_g2_avb_ptp_read(struct mv88e6xxx_chip *chip, int addr,
201 u16 *data, int len)
202{
203 return mv88e6390_g2_avb_port_ptp_read(chip,
204 MV88E6390_G2_AVB_CMD_PORT_PTPGLOBAL,
205 addr, data, len);
206}
207
208static int mv88e6390_g2_avb_ptp_write(struct mv88e6xxx_chip *chip, int addr,
209 u16 data)
210{
211 return mv88e6390_g2_avb_port_ptp_write(chip,
212 MV88E6390_G2_AVB_CMD_PORT_PTPGLOBAL,
213 addr, data);
214}
215
216static int mv88e6390_g2_avb_tai_read(struct mv88e6xxx_chip *chip, int addr,
217 u16 *data, int len)
218{
219 return mv88e6390_g2_avb_port_ptp_read(chip,
220 MV88E6390_G2_AVB_CMD_PORT_TAIGLOBAL,
221 addr, data, len);
222}
223
224static int mv88e6390_g2_avb_tai_write(struct mv88e6xxx_chip *chip, int addr,
225 u16 data)
226{
227 return mv88e6390_g2_avb_port_ptp_write(chip,
228 MV88E6390_G2_AVB_CMD_PORT_TAIGLOBAL,
229 addr, data);
230}
231
232const struct mv88e6xxx_avb_ops mv88e6390_avb_ops = {
233 .port_ptp_read = mv88e6390_g2_avb_port_ptp_read,
234 .port_ptp_write = mv88e6390_g2_avb_port_ptp_write,
235 .ptp_read = mv88e6390_g2_avb_ptp_read,
236 .ptp_write = mv88e6390_g2_avb_ptp_write,
237 .tai_read = mv88e6390_g2_avb_tai_read,
238 .tai_write = mv88e6390_g2_avb_tai_write,
239};