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 #define PRESTERA_DSA_W1_MASK_CPU_CODE GENMASK(7, 0) 23 24 #define PRESTERA_DSA_W2_EXT_BIT BIT(31) 25 #define PRESTERA_DSA_W2_PORT_NUM BIT(20) 26 27 #define PRESTERA_DSA_W3_VID GENMASK(30, 27) 28 #define PRESTERA_DSA_W3_DST_EPORT GENMASK(23, 7) 29 #define PRESTERA_DSA_W3_DEV_NUM GENMASK(6, 0) 30 31 #define PRESTERA_DSA_VID GENMASK(15, 12) 32 #define PRESTERA_DSA_DEV_NUM GENMASK(11, 5) 33 34 int prestera_dsa_parse(struct prestera_dsa *dsa, const u8 *dsa_buf) 35 { 36 __be32 *dsa_words = (__be32 *)dsa_buf; 37 enum prestera_dsa_cmd cmd; 38 u32 words[4]; 39 u32 field; 40 41 words[0] = ntohl(dsa_words[0]); 42 words[1] = ntohl(dsa_words[1]); 43 words[2] = ntohl(dsa_words[2]); 44 words[3] = ntohl(dsa_words[3]); 45 46 /* set the common parameters */ 47 cmd = (enum prestera_dsa_cmd)FIELD_GET(PRESTERA_DSA_W0_CMD, words[0]); 48 49 /* only to CPU is supported */ 50 if (unlikely(cmd != PRESTERA_DSA_CMD_TO_CPU)) 51 return -EINVAL; 52 53 if (FIELD_GET(PRESTERA_DSA_W0_EXT_BIT, words[0]) == 0) 54 return -EINVAL; 55 if (FIELD_GET(PRESTERA_DSA_W1_EXT_BIT, words[1]) == 0) 56 return -EINVAL; 57 if (FIELD_GET(PRESTERA_DSA_W2_EXT_BIT, words[2]) == 0) 58 return -EINVAL; 59 60 field = FIELD_GET(PRESTERA_DSA_W3_VID, words[3]); 61 62 dsa->vlan.is_tagged = FIELD_GET(PRESTERA_DSA_W0_IS_TAGGED, words[0]); 63 dsa->vlan.cfi_bit = FIELD_GET(PRESTERA_DSA_W1_CFI_BIT, words[1]); 64 dsa->vlan.vpt = FIELD_GET(PRESTERA_DSA_W0_VPT, words[0]); 65 dsa->vlan.vid = FIELD_GET(PRESTERA_DSA_W0_VID, words[0]); 66 dsa->vlan.vid &= ~PRESTERA_DSA_VID; 67 dsa->vlan.vid |= FIELD_PREP(PRESTERA_DSA_VID, field); 68 69 field = FIELD_GET(PRESTERA_DSA_W3_DEV_NUM, words[3]); 70 71 dsa->hw_dev_num = FIELD_GET(PRESTERA_DSA_W0_DEV_NUM, words[0]); 72 dsa->hw_dev_num |= FIELD_PREP(PRESTERA_DSA_DEV_NUM, field); 73 74 dsa->port_num = (FIELD_GET(PRESTERA_DSA_W0_PORT_NUM, words[0]) << 0) | 75 (FIELD_GET(PRESTERA_DSA_W1_PORT_NUM, words[1]) << 5) | 76 (FIELD_GET(PRESTERA_DSA_W2_PORT_NUM, words[2]) << 7); 77 78 dsa->cpu_code = FIELD_GET(PRESTERA_DSA_W1_MASK_CPU_CODE, words[1]); 79 80 return 0; 81 } 82 83 int prestera_dsa_build(const struct prestera_dsa *dsa, u8 *dsa_buf) 84 { 85 __be32 *dsa_words = (__be32 *)dsa_buf; 86 u32 dev_num = dsa->hw_dev_num; 87 u32 words[4] = { 0 }; 88 89 words[0] |= FIELD_PREP(PRESTERA_DSA_W0_CMD, PRESTERA_DSA_CMD_FROM_CPU); 90 91 words[0] |= FIELD_PREP(PRESTERA_DSA_W0_DEV_NUM, dev_num); 92 dev_num = FIELD_GET(PRESTERA_DSA_DEV_NUM, dev_num); 93 words[3] |= FIELD_PREP(PRESTERA_DSA_W3_DEV_NUM, dev_num); 94 95 words[3] |= FIELD_PREP(PRESTERA_DSA_W3_DST_EPORT, dsa->port_num); 96 97 words[0] |= FIELD_PREP(PRESTERA_DSA_W0_EXT_BIT, 1); 98 words[1] |= FIELD_PREP(PRESTERA_DSA_W1_EXT_BIT, 1); 99 words[2] |= FIELD_PREP(PRESTERA_DSA_W2_EXT_BIT, 1); 100 101 dsa_words[0] = htonl(words[0]); 102 dsa_words[1] = htonl(words[1]); 103 dsa_words[2] = htonl(words[2]); 104 dsa_words[3] = htonl(words[3]); 105 106 return 0; 107 } 108