linux/drivers/net/can/spi/mcp251xfd/mcp251xfd-rx.c

// SPDX-License-Identifier: GPL-2.0
//
// mcp251xfd - Microchip MCP251xFD Family CAN controller driver
//
// Copyright (c) 2019, 2020, 2021, 2023 Pengutronix,
//               Marc Kleine-Budde <[email protected]>
//
// Based on:
//
// CAN bus driver for Microchip 25XXFD CAN Controller with SPI Interface
//
// Copyright (c) 2019 Martin Sperl <[email protected]>
//

#include <linux/bitfield.h>

#include "mcp251xfd.h"

static inline bool mcp251xfd_rx_fifo_sta_empty(const u32 fifo_sta)
{ … }

static inline bool mcp251xfd_rx_fifo_sta_full(const u32 fifo_sta)
{ … }

static inline int
mcp251xfd_rx_tail_get_from_chip(const struct mcp251xfd_priv *priv,
				const struct mcp251xfd_rx_ring *ring,
				u8 *rx_tail)
{ … }

static int
mcp251xfd_check_rx_tail(const struct mcp251xfd_priv *priv,
			const struct mcp251xfd_rx_ring *ring)
{ … }

static int
mcp251xfd_get_rx_len(const struct mcp251xfd_priv *priv,
		     const struct mcp251xfd_rx_ring *ring,
		     u8 *len_p)
{ … }

static void
mcp251xfd_hw_rx_obj_to_skb(const struct mcp251xfd_priv *priv,
			   const struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj,
			   struct sk_buff *skb)
{ … }

static int
mcp251xfd_handle_rxif_one(struct mcp251xfd_priv *priv,
			  struct mcp251xfd_rx_ring *ring,
			  const struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj)
{ … }

static inline int
mcp251xfd_rx_obj_read(const struct mcp251xfd_priv *priv,
		      const struct mcp251xfd_rx_ring *ring,
		      struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj,
		      const u8 offset, const u8 len)
{ … }

static int
mcp251xfd_handle_rxif_ring_uinc(const struct mcp251xfd_priv *priv,
				struct mcp251xfd_rx_ring *ring,
				u8 len)
{ … }

static int
mcp251xfd_handle_rxif_ring(struct mcp251xfd_priv *priv,
			   struct mcp251xfd_rx_ring *ring)
{ … }

int mcp251xfd_handle_rxif(struct mcp251xfd_priv *priv)
{ … }