1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /* Copyright (c) 2020 Marvell International Ltd. All rights reserved */
3
4 #include <linux/bitfield.h>
5 #include <linux/bitops.h>
6 #include <linux/errno.h>
7 #include <linux/string.h>
8
9 #include "prestera_dsa.h"
10
11 #define PRESTERA_DSA_W0_CMD GENMASK(31, 30)
12 #define PRESTERA_DSA_W0_IS_TAGGED BIT(29)
13 #define PRESTERA_DSA_W0_DEV_NUM GENMASK(28, 24)
14 #define PRESTERA_DSA_W0_PORT_NUM GENMASK(23, 19)
15 #define PRESTERA_DSA_W0_VPT GENMASK(15, 13)
16 #define PRESTERA_DSA_W0_EXT_BIT BIT(12)
17 #define PRESTERA_DSA_W0_VID GENMASK(11, 0)
18
19 #define PRESTERA_DSA_W1_EXT_BIT BIT(31)
20 #define PRESTERA_DSA_W1_CFI_BIT BIT(30)
21 #define PRESTERA_DSA_W1_PORT_NUM GENMASK(11, 10)
22
23 #define PRESTERA_DSA_W2_EXT_BIT BIT(31)
24 #define PRESTERA_DSA_W2_PORT_NUM BIT(20)
25
26 #define PRESTERA_DSA_W3_VID GENMASK(30, 27)
27 #define PRESTERA_DSA_W3_DST_EPORT GENMASK(23, 7)
28 #define PRESTERA_DSA_W3_DEV_NUM GENMASK(6, 0)
29
30 #define PRESTERA_DSA_VID GENMASK(15, 12)
31 #define PRESTERA_DSA_DEV_NUM GENMASK(11, 5)
32
prestera_dsa_parse(struct prestera_dsa * dsa,const u8 * dsa_buf)33 int prestera_dsa_parse(struct prestera_dsa *dsa, const u8 *dsa_buf)
34 {
35 __be32 *dsa_words = (__be32 *)dsa_buf;
36 enum prestera_dsa_cmd cmd;
37 u32 words[4];
38 u32 field;
39
40 words[0] = ntohl(dsa_words[0]);
41 words[1] = ntohl(dsa_words[1]);
42 words[2] = ntohl(dsa_words[2]);
43 words[3] = ntohl(dsa_words[3]);
44
45 /* set the common parameters */
46 cmd = (enum prestera_dsa_cmd)FIELD_GET(PRESTERA_DSA_W0_CMD, words[0]);
47
48 /* only to CPU is supported */
49 if (unlikely(cmd != PRESTERA_DSA_CMD_TO_CPU))
50 return -EINVAL;
51
52 if (FIELD_GET(PRESTERA_DSA_W0_EXT_BIT, words[0]) == 0)
53 return -EINVAL;
54 if (FIELD_GET(PRESTERA_DSA_W1_EXT_BIT, words[1]) == 0)
55 return -EINVAL;
56 if (FIELD_GET(PRESTERA_DSA_W2_EXT_BIT, words[2]) == 0)
57 return -EINVAL;
58
59 field = FIELD_GET(PRESTERA_DSA_W3_VID, words[3]);
60
61 dsa->vlan.is_tagged = FIELD_GET(PRESTERA_DSA_W0_IS_TAGGED, words[0]);
62 dsa->vlan.cfi_bit = FIELD_GET(PRESTERA_DSA_W1_CFI_BIT, words[1]);
63 dsa->vlan.vpt = FIELD_GET(PRESTERA_DSA_W0_VPT, words[0]);
64 dsa->vlan.vid = FIELD_GET(PRESTERA_DSA_W0_VID, words[0]);
65 dsa->vlan.vid &= ~PRESTERA_DSA_VID;
66 dsa->vlan.vid |= FIELD_PREP(PRESTERA_DSA_VID, field);
67
68 field = FIELD_GET(PRESTERA_DSA_W3_DEV_NUM, words[3]);
69
70 dsa->hw_dev_num = FIELD_GET(PRESTERA_DSA_W0_DEV_NUM, words[0]);
71 dsa->hw_dev_num |= FIELD_PREP(PRESTERA_DSA_DEV_NUM, field);
72
73 dsa->port_num = (FIELD_GET(PRESTERA_DSA_W0_PORT_NUM, words[0]) << 0) |
74 (FIELD_GET(PRESTERA_DSA_W1_PORT_NUM, words[1]) << 5) |
75 (FIELD_GET(PRESTERA_DSA_W2_PORT_NUM, words[2]) << 7);
76
77 return 0;
78 }
79
prestera_dsa_build(const struct prestera_dsa * dsa,u8 * dsa_buf)80 int prestera_dsa_build(const struct prestera_dsa *dsa, u8 *dsa_buf)
81 {
82 __be32 *dsa_words = (__be32 *)dsa_buf;
83 u32 dev_num = dsa->hw_dev_num;
84 u32 words[4] = { 0 };
85
86 words[0] |= FIELD_PREP(PRESTERA_DSA_W0_CMD, PRESTERA_DSA_CMD_FROM_CPU);
87
88 words[0] |= FIELD_PREP(PRESTERA_DSA_W0_DEV_NUM, dev_num);
89 dev_num = FIELD_GET(PRESTERA_DSA_DEV_NUM, dev_num);
90 words[3] |= FIELD_PREP(PRESTERA_DSA_W3_DEV_NUM, dev_num);
91
92 words[3] |= FIELD_PREP(PRESTERA_DSA_W3_DST_EPORT, dsa->port_num);
93
94 words[0] |= FIELD_PREP(PRESTERA_DSA_W0_EXT_BIT, 1);
95 words[1] |= FIELD_PREP(PRESTERA_DSA_W1_EXT_BIT, 1);
96 words[2] |= FIELD_PREP(PRESTERA_DSA_W2_EXT_BIT, 1);
97
98 dsa_words[0] = htonl(words[0]);
99 dsa_words[1] = htonl(words[1]);
100 dsa_words[2] = htonl(words[2]);
101 dsa_words[3] = htonl(words[3]);
102
103 return 0;
104 }
105