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/* SPDX-License-Identifier: GPL-2.0 */
/* CAN bus driver for Microchip 25XXFD CAN Controller with SPI Interface
*
* Copyright 2019 Martin Sperl <kernel@martin.sperl.org>
*/
#ifndef __MCP25XXFD_CAN_IF_H
#define __MCP25XXFD_CAN_IF_H
#include <uapi/linux/can.h>
#include "mcp25xxfd_can_id.h"
#include "mcp25xxfd_regs.h"
/* ideally these would be defined in uapi/linux/can.h */
#define MCP25XXFD_CAN_EFF_SID_SHIFT (CAN_EFF_ID_BITS - CAN_SFF_ID_BITS)
#define MCP25XXFD_CAN_EFF_SID_BITS CAN_SFF_ID_BITS
#define MCP25XXFD_CAN_EFF_SID_MASK \
GENMASK(MCP25XXFD_CAN_EFF_SID_SHIFT + MCP25XXFD_CAN_EFF_SID_BITS - 1, \
MCP25XXFD_CAN_EFF_SID_SHIFT)
#define MCP25XXFD_CAN_EFF_EID_SHIFT 0
#define MCP25XXFD_CAN_EFF_EID_BITS MCP25XXFD_CAN_EFF_SID_SHIFT
#define MCP25XXFD_CAN_EFF_EID_MASK \
GENMASK(MCP25XXFD_CAN_EFF_EID_SHIFT + MCP25XXFD_CAN_EFF_EID_BITS - 1, \
MCP25XXFD_CAN_EFF_EID_SHIFT)
static inline
void mcp25xxfd_can_id_from_mcp25xxfd(u32 mcp_id, u32 mcp_flags, u32 *can_id)
{
u32 sid = (mcp_id & MCP25XXFD_CAN_OBJ_ID_SID_MASK) >>
MCP25XXFD_CAN_OBJ_ID_SID_SHIFT;
u32 eid = (mcp_id & MCP25XXFD_CAN_OBJ_ID_EID_MASK) >>
MCP25XXFD_CAN_OBJ_ID_EID_SHIFT;
/* select normal or extended ids */
if (mcp_flags & MCP25XXFD_CAN_OBJ_FLAGS_IDE) {
*can_id = (eid << MCP25XXFD_CAN_EFF_EID_SHIFT) |
(sid << MCP25XXFD_CAN_EFF_SID_SHIFT) |
CAN_EFF_FLAG;
} else {
*can_id = sid << MCP25XXFD_CAN_EFF_EID_SHIFT;
}
/* handle rtr */
*can_id |= (mcp_flags & MCP25XXFD_CAN_OBJ_FLAGS_RTR) ? CAN_RTR_FLAG : 0;
}
static inline
void mcp25xxfd_can_id_to_mcp25xxfd(u32 can_id, u32 *id, u32 *flags)
{
/* depending on can_id flag compute extended or standard ids */
if (can_id & CAN_EFF_FLAG) {
int sid = (can_id & MCP25XXFD_CAN_EFF_SID_MASK) >>
MCP25XXFD_CAN_EFF_SID_SHIFT;
int eid = (can_id & MCP25XXFD_CAN_EFF_EID_MASK) >>
MCP25XXFD_CAN_EFF_EID_SHIFT;
*id = (eid << MCP25XXFD_CAN_OBJ_ID_EID_SHIFT) |
(sid << MCP25XXFD_CAN_OBJ_ID_SID_SHIFT);
*flags = MCP25XXFD_CAN_OBJ_FLAGS_IDE;
} else {
*id = can_id & CAN_SFF_MASK;
*flags = 0;
}
/* Handle RTR */
*flags |= (can_id & CAN_RTR_FLAG) ? MCP25XXFD_CAN_OBJ_FLAGS_RTR : 0;
}
#endif /* __MCP25XXFD_CAN_IF_H */
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