1// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
 2/* Copyright(c) 2021 Intel Corporation */
 3#include <linux/crc8.h>
 4#include <linux/pci.h>
 5#include <linux/types.h>
 6#include "adf_accel_devices.h"
 7#include "adf_pfvf_msg.h"
 8#include "adf_pfvf_utils.h"
 9
10/* CRC Calculation */
11DECLARE_CRC8_TABLE(pfvf_crc8_table);
12#define ADF_PFVF_CRC8_POLYNOMIAL 0x97
13
14void adf_pfvf_crc_init(void)
15{
16	crc8_populate_msb(pfvf_crc8_table, ADF_PFVF_CRC8_POLYNOMIAL);
17}
18
19u8 adf_pfvf_calc_blkmsg_crc(u8 const *buf, u8 buf_len)
20{
21	return crc8(pfvf_crc8_table, buf, buf_len, CRC8_INIT_VALUE);
22}
23
24static bool set_value_on_csr_msg(struct adf_accel_dev *accel_dev, u32 *csr_msg,
25				 u32 value, const struct pfvf_field_format *fmt)
26{
27	if (unlikely((value & fmt->mask) != value)) {
28		dev_err(&GET_DEV(accel_dev),
29			"PFVF message value 0x%X out of range, %u max allowed\n",
30			value, fmt->mask);
31		return false;
32	}
33
34	*csr_msg |= value << fmt->offset;
35
36	return true;
37}
38
39u32 adf_pfvf_csr_msg_of(struct adf_accel_dev *accel_dev,
40			struct pfvf_message msg,
41			const struct pfvf_csr_format *fmt)
42{
43	u32 csr_msg = 0;
44
45	if (!set_value_on_csr_msg(accel_dev, &csr_msg, msg.type, &fmt->type) ||
46	    !set_value_on_csr_msg(accel_dev, &csr_msg, msg.data, &fmt->data))
47		return 0;
48
49	return csr_msg | ADF_PFVF_MSGORIGIN_SYSTEM;
50}
51
52struct pfvf_message adf_pfvf_message_of(struct adf_accel_dev *accel_dev, u32 csr_msg,
53					const struct pfvf_csr_format *fmt)
54{
55	struct pfvf_message msg = { 0 };
56
57	msg.type = (csr_msg >> fmt->type.offset) & fmt->type.mask;
58	msg.data = (csr_msg >> fmt->data.offset) & fmt->data.mask;
59
60	if (unlikely(!msg.type))
61		dev_err(&GET_DEV(accel_dev),
62			"Invalid PFVF msg with no type received\n");
63
64	return msg;
65}