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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_TX_H
#define __MCP25XXFD_CAN_TX_H
#include <linux/spinlock.h>
#include <linux/spi/spi.h>
#include "mcp25xxfd_can_priv.h"
/* structure of a spi message that is prepared and can get submitted quickly */
struct mcp25xxfd_tx_spi_message {
/* the network device this is related to */
struct mcp25xxfd_can_priv *cpriv;
/* the fifo this fills */
u32 fifo;
/* the xfer to fill in the fifo data */
struct {
struct spi_message msg;
struct spi_transfer xfer;
struct {
u8 cmd[2];
u8 header[sizeof(struct mcp25xxfd_can_obj_tx)];
u8 data[64];
} data;
} fill_fifo;
/* the xfer to enable transmission on the can bus */
struct {
struct spi_message msg;
struct spi_transfer xfer;
struct {
u8 cmd[2];
u8 data;
} data;
} trigger_fifo;
};
struct mcp25xxfd_tx_spi_message_queue {
/* spinlock protecting the bitmaps
* as well as state and the skb_echo_* functions
*/
spinlock_t lock;
/* bitmap of which fifo is in which stage */
u32 idle;
u32 in_fill_fifo_transfer;
u32 in_trigger_fifo_transfer;
u32 in_can_transfer;
u32 transferred;
/* the queue state as seen per controller */
int state;
#define MCP25XXFD_CAN_TX_QUEUE_STATE_STOPPED 0
#define MCP25XXFD_CAN_TX_QUEUE_STATE_STARTED 1
#define MCP25XXFD_CAN_TX_QUEUE_STATE_RUNABLE 2
#define MCP25XXFD_CAN_TX_QUEUE_STATE_RESTART 3
/* map each fifo to a mcp25xxfd_tx_spi_message */
struct mcp25xxfd_tx_spi_message *fifo2message[32];
/* the individual messages */
struct mcp25xxfd_tx_spi_message message[];
};
int mcp25xxfd_can_tx_submit_frame(struct mcp25xxfd_can_priv *cpriv, int fifo);
void mcp25xxfd_can_tx_queue_restart(struct mcp25xxfd_can_priv *cpriv);
int mcp25xxfd_can_tx_handle_int_txatif(struct mcp25xxfd_can_priv *cpriv);
int mcp25xxfd_can_tx_handle_int_tefif(struct mcp25xxfd_can_priv *cpriv);
netdev_tx_t mcp25xxfd_can_tx_start_xmit(struct sk_buff *skb,
struct net_device *net);
void mcp25xxfd_can_tx_queue_manage(struct mcp25xxfd_can_priv *cpriv, int state);
int mcp25xxfd_can_tx_queue_alloc(struct mcp25xxfd_can_priv *cpriv);
void mcp25xxfd_can_tx_queue_free(struct mcp25xxfd_can_priv *cpriv);
#endif /* __MCP25XXFD_CAN_TX_H */
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