// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/* Copyright (c) 2020 Marvell International Ltd. All rights reserved */
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#include <linux/bitfield.h>
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include "prestera_dsa.h"
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#define PRESTERA_DSA_W0_CMD GENMASK(31, 30)
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#define PRESTERA_DSA_W0_IS_TAGGED BIT(29)
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#define PRESTERA_DSA_W0_DEV_NUM GENMASK(28, 24)
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#define PRESTERA_DSA_W0_PORT_NUM GENMASK(23, 19)
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#define PRESTERA_DSA_W0_VPT GENMASK(15, 13)
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#define PRESTERA_DSA_W0_EXT_BIT BIT(12)
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#define PRESTERA_DSA_W0_VID GENMASK(11, 0)
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#define PRESTERA_DSA_W1_EXT_BIT BIT(31)
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#define PRESTERA_DSA_W1_CFI_BIT BIT(30)
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#define PRESTERA_DSA_W1_PORT_NUM GENMASK(11, 10)
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#define PRESTERA_DSA_W2_EXT_BIT BIT(31)
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#define PRESTERA_DSA_W2_PORT_NUM BIT(20)
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#define PRESTERA_DSA_W3_VID GENMASK(30, 27)
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#define PRESTERA_DSA_W3_DST_EPORT GENMASK(23, 7)
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#define PRESTERA_DSA_W3_DEV_NUM GENMASK(6, 0)
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#define PRESTERA_DSA_VID GENMASK(15, 12)
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#define PRESTERA_DSA_DEV_NUM GENMASK(11, 5)
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int prestera_dsa_parse(struct prestera_dsa *dsa, const u8 *dsa_buf)
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{
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__be32 *dsa_words = (__be32 *)dsa_buf;
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enum prestera_dsa_cmd cmd;
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u32 words[4];
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u32 field;
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words[0] = ntohl(dsa_words[0]);
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words[1] = ntohl(dsa_words[1]);
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words[2] = ntohl(dsa_words[2]);
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words[3] = ntohl(dsa_words[3]);
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/* set the common parameters */
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cmd = (enum prestera_dsa_cmd)FIELD_GET(PRESTERA_DSA_W0_CMD, words[0]);
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/* only to CPU is supported */
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if (unlikely(cmd != PRESTERA_DSA_CMD_TO_CPU))
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return -EINVAL;
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if (FIELD_GET(PRESTERA_DSA_W0_EXT_BIT, words[0]) == 0)
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return -EINVAL;
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if (FIELD_GET(PRESTERA_DSA_W1_EXT_BIT, words[1]) == 0)
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return -EINVAL;
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if (FIELD_GET(PRESTERA_DSA_W2_EXT_BIT, words[2]) == 0)
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return -EINVAL;
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field = FIELD_GET(PRESTERA_DSA_W3_VID, words[3]);
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dsa->vlan.is_tagged = FIELD_GET(PRESTERA_DSA_W0_IS_TAGGED, words[0]);
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dsa->vlan.cfi_bit = FIELD_GET(PRESTERA_DSA_W1_CFI_BIT, words[1]);
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dsa->vlan.vpt = FIELD_GET(PRESTERA_DSA_W0_VPT, words[0]);
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dsa->vlan.vid = FIELD_GET(PRESTERA_DSA_W0_VID, words[0]);
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dsa->vlan.vid &= ~PRESTERA_DSA_VID;
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dsa->vlan.vid |= FIELD_PREP(PRESTERA_DSA_VID, field);
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field = FIELD_GET(PRESTERA_DSA_W3_DEV_NUM, words[3]);
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dsa->hw_dev_num = FIELD_GET(PRESTERA_DSA_W0_DEV_NUM, words[0]);
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dsa->hw_dev_num |= FIELD_PREP(PRESTERA_DSA_DEV_NUM, field);
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dsa->port_num = (FIELD_GET(PRESTERA_DSA_W0_PORT_NUM, words[0]) << 0) |
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(FIELD_GET(PRESTERA_DSA_W1_PORT_NUM, words[1]) << 5) |
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(FIELD_GET(PRESTERA_DSA_W2_PORT_NUM, words[2]) << 7);
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return 0;
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}
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int prestera_dsa_build(const struct prestera_dsa *dsa, u8 *dsa_buf)
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{
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__be32 *dsa_words = (__be32 *)dsa_buf;
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u32 dev_num = dsa->hw_dev_num;
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u32 words[4] = { 0 };
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words[0] |= FIELD_PREP(PRESTERA_DSA_W0_CMD, PRESTERA_DSA_CMD_FROM_CPU);
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words[0] |= FIELD_PREP(PRESTERA_DSA_W0_DEV_NUM, dev_num);
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dev_num = FIELD_GET(PRESTERA_DSA_DEV_NUM, dev_num);
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words[3] |= FIELD_PREP(PRESTERA_DSA_W3_DEV_NUM, dev_num);
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words[3] |= FIELD_PREP(PRESTERA_DSA_W3_DST_EPORT, dsa->port_num);
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words[0] |= FIELD_PREP(PRESTERA_DSA_W0_EXT_BIT, 1);
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words[1] |= FIELD_PREP(PRESTERA_DSA_W1_EXT_BIT, 1);
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words[2] |= FIELD_PREP(PRESTERA_DSA_W2_EXT_BIT, 1);
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dsa_words[0] = htonl(words[0]);
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dsa_words[1] = htonl(words[1]);
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dsa_words[2] = htonl(words[2]);
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dsa_words[3] = htonl(words[3]);
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return 0;
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}
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