diff options
Diffstat (limited to 'drivers/net/can/spi/mcp25xxfd/mcp25xxfd_can_id.h')
| -rw-r--r-- | drivers/net/can/spi/mcp25xxfd/mcp25xxfd_can_id.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/net/can/spi/mcp25xxfd/mcp25xxfd_can_id.h b/drivers/net/can/spi/mcp25xxfd/mcp25xxfd_can_id.h new file mode 100644 index 000000000000..00a6c6639bd5 --- /dev/null +++ b/drivers/net/can/spi/mcp25xxfd/mcp25xxfd_can_id.h @@ -0,0 +1,69 @@ +/* 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 */ |