1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-chip-fifo.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-chip-fifo.c
new file mode 100644
index 000000000000..2f9a623d381d
--- /dev/null
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-chip-fifo.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// mcp251xfd - Microchip MCP251xFD Family CAN controller driver
+//
+// Copyright (c) 2019, 2020, 2021 Pengutronix,
+//               Marc Kleine-Budde <kernel@pengutronix.de>
+//
+// Based on:
+//
+// CAN bus driver for Microchip 25XXFD CAN Controller with SPI Interface
+//
+// Copyright (c) 2019 Martin Sperl <kernel@martin.sperl.org>
+//
+
+#include <linux/bitfield.h>
+
+#include "mcp251xfd.h"
+
+static int
+mcp251xfd_chip_rx_fifo_init_one(const struct mcp251xfd_priv *priv,
+				const struct mcp251xfd_rx_ring *ring)
+{
+	u32 fifo_con;
+
+	/* Enable RXOVIE on _all_ RX FIFOs, not just the last one.
+	 *
+	 * FIFOs hit by a RX MAB overflow and RXOVIE enabled will
+	 * generate a RXOVIF, use this to properly detect RX MAB
+	 * overflows.
+	 */
+	fifo_con = FIELD_PREP(MCP251XFD_REG_FIFOCON_FSIZE_MASK,
+			      ring->obj_num - 1) |
+		MCP251XFD_REG_FIFOCON_RXTSEN |
+		MCP251XFD_REG_FIFOCON_RXOVIE |
+		MCP251XFD_REG_FIFOCON_TFNRFNIE;
+
+	if (mcp251xfd_is_fd_mode(priv))
+		fifo_con |= FIELD_PREP(MCP251XFD_REG_FIFOCON_PLSIZE_MASK,
+				       MCP251XFD_REG_FIFOCON_PLSIZE_64);
+	else
+		fifo_con |= FIELD_PREP(MCP251XFD_REG_FIFOCON_PLSIZE_MASK,
+				       MCP251XFD_REG_FIFOCON_PLSIZE_8);
+
+	return regmap_write(priv->map_reg,
+			    MCP251XFD_REG_FIFOCON(ring->fifo_nr), fifo_con);
+}
+
+static int
+mcp251xfd_chip_rx_filter_init_one(const struct mcp251xfd_priv *priv,
+				  const struct mcp251xfd_rx_ring *ring)
+{
+	u32 fltcon;
+
+	fltcon = MCP251XFD_REG_FLTCON_FLTEN(ring->nr) |
+		MCP251XFD_REG_FLTCON_FBP(ring->nr, ring->fifo_nr);
+
+	return regmap_update_bits(priv->map_reg,
+				  MCP251XFD_REG_FLTCON(ring->nr >> 2),
+				  MCP251XFD_REG_FLTCON_FLT_MASK(ring->nr),
+				  fltcon);
+}
+
+int mcp251xfd_chip_fifo_init(const struct mcp251xfd_priv *priv)
+{
+	const struct mcp251xfd_tx_ring *tx_ring = priv->tx;
+	const struct mcp251xfd_rx_ring *rx_ring;
+	u32 val;
+	int err, n;
+
+	/* TEF */
+	val = FIELD_PREP(MCP251XFD_REG_TEFCON_FSIZE_MASK,
+			 tx_ring->obj_num - 1) |
+		MCP251XFD_REG_TEFCON_TEFTSEN |
+		MCP251XFD_REG_TEFCON_TEFOVIE |
+		MCP251XFD_REG_TEFCON_TEFNEIE;
+
+	err = regmap_write(priv->map_reg, MCP251XFD_REG_TEFCON, val);
+	if (err)
+		return err;
+
+	/* FIFO 1 - TX */
+	val = FIELD_PREP(MCP251XFD_REG_FIFOCON_FSIZE_MASK,
+			 tx_ring->obj_num - 1) |
+		MCP251XFD_REG_FIFOCON_TXEN |
+		MCP251XFD_REG_FIFOCON_TXATIE;
+
+	if (mcp251xfd_is_fd_mode(priv))
+		val |= FIELD_PREP(MCP251XFD_REG_FIFOCON_PLSIZE_MASK,
+				  MCP251XFD_REG_FIFOCON_PLSIZE_64);
+	else
+		val |= FIELD_PREP(MCP251XFD_REG_FIFOCON_PLSIZE_MASK,
+				  MCP251XFD_REG_FIFOCON_PLSIZE_8);
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
+		val |= FIELD_PREP(MCP251XFD_REG_FIFOCON_TXAT_MASK,
+				  MCP251XFD_REG_FIFOCON_TXAT_ONE_SHOT);
+	else
+		val |= FIELD_PREP(MCP251XFD_REG_FIFOCON_TXAT_MASK,
+				  MCP251XFD_REG_FIFOCON_TXAT_UNLIMITED);
+
+	err = regmap_write(priv->map_reg,
+			   MCP251XFD_REG_FIFOCON(MCP251XFD_TX_FIFO),
+			   val);
+	if (err)
+		return err;
+
+	/* RX FIFOs */
+	mcp251xfd_for_each_rx_ring(priv, rx_ring, n) {
+		err = mcp251xfd_chip_rx_fifo_init_one(priv, rx_ring);
+		if (err)
+			return err;
+
+		err = mcp251xfd_chip_rx_filter_init_one(priv, rx_ring);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}