1 /* SPDX-License-Identifier: GPL-2.0
3  * mcp251xfd - Microchip MCP251xFD Family CAN controller driver
6  *               Marc Kleine-Budde <kernel@pengutronix.de>
16 #include <linux/can/rx-offload.h>
22 #include <linux/spi/spi.h>
370 /* SPI commands */
424 /* Use CRC to access registers */
426 /* Use CRC to access RX/TEF-RAM */
428 /* Use CRC to access TX-RAM */
432 /* Use Half Duplex SPI transfers */
441 /* The tx_obj_raw version is used in spi async, i.e. without
493 		__be16 crc;  member
494 	} crc;  member
505 		__be16 crc;  member
506 	} crc;  member
519 	/* u8 obj_num equals tx_ring->obj_num */
572 	u8 data[256 - 4];
573 	__be16 crc;  member
621 	struct spi_device *spi;  member
663 	return priv->devtype_data.model == MCP251XFD_MODEL_MCP##_model; \
673 	/* listen-only mode works like FD mode */  in mcp251xfd_is_fd_mode()
674 	return priv->can.ctrlmode & (CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_FD);  in mcp251xfd_is_fd_mode()
699 	cmd->cmd = cpu_to_be16(MCP251XFD_SPI_INSTRUCTION_READ | addr);  in mcp251xfd_spi_cmd_read_nocrc()
705 	cmd->cmd = cpu_to_be16(MCP251XFD_SPI_INSTRUCTION_WRITE | addr);  in mcp251xfd_spi_cmd_write_nocrc()
712 				 MCP251XFD_RAM_START + MCP251XFD_RAM_SIZE - 4);  in mcp251xfd_reg_in_ram()
723 		cmd->len = len >> 2;  in __mcp251xfd_spi_cmd_crc_set_len()
725 		cmd->len = len;  in __mcp251xfd_spi_cmd_crc_set_len()
743 	cmd->cmd = cpu_to_be16(MCP251XFD_SPI_INSTRUCTION_READ_CRC | addr);  in mcp251xfd_spi_cmd_read_crc_set_addr()
758 	cmd->cmd = cpu_to_be16(MCP251XFD_SPI_INSTRUCTION_WRITE_CRC | addr);  in mcp251xfd_spi_cmd_write_crc_set_addr()
776 	if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_REG) {  in mcp251xfd_spi_cmd_write()
777 		mcp251xfd_spi_cmd_write_crc_set_addr(&write_reg_buf->crc.cmd,  in mcp251xfd_spi_cmd_write()
779 		data = write_reg_buf->crc.data;  in mcp251xfd_spi_cmd_write()
781 		mcp251xfd_spi_cmd_write_nocrc(&write_reg_buf->nocrc.cmd,  in mcp251xfd_spi_cmd_write()
783 		data = write_reg_buf->nocrc.data;  in mcp251xfd_spi_cmd_write()
792 	return regmap_read(priv->map_reg, MCP251XFD_REG_TBC, timestamp);  in mcp251xfd_get_timestamp()
804 	return ring->base + ring->obj_size * n;  in mcp251xfd_get_tx_obj_addr()
810 	return ring->base + ring->obj_size * n;  in mcp251xfd_get_rx_obj_addr()
820 	err = regmap_read(priv->map_reg,  in mcp251xfd_tx_tail_get_from_chip()
821 			  MCP251XFD_REG_FIFOSTA(priv->tx->fifo_nr),  in mcp251xfd_tx_tail_get_from_chip()
833 	return priv->tef->head & (priv->tx->obj_num - 1);  in mcp251xfd_get_tef_head()
838 	return priv->tef->tail & (priv->tx->obj_num - 1);  in mcp251xfd_get_tef_tail()
843 	return priv->tef->head - priv->tef->tail;  in mcp251xfd_get_tef_len()
852 	return min_t(u8, len, priv->tx->obj_num - mcp251xfd_get_tef_tail(priv));  in mcp251xfd_get_tef_linear_len()
857 	return ring->head & (ring->obj_num - 1);  in mcp251xfd_get_tx_head()
862 	return ring->tail & (ring->obj_num - 1);  in mcp251xfd_get_tx_tail()
867 	return ring->obj_num - (ring->head - ring->tail);  in mcp251xfd_get_tx_free()
875 	    addr >= mcp251xfd_get_tx_obj_addr(tx_ring, tx_ring->obj_num))  in mcp251xfd_get_tx_nr_by_addr()
876 		return -ENOENT;  in mcp251xfd_get_tx_nr_by_addr()
878 	*nr = (addr - mcp251xfd_get_tx_obj_addr(tx_ring, 0)) /  in mcp251xfd_get_tx_nr_by_addr()
879 		tx_ring->obj_size;  in mcp251xfd_get_tx_nr_by_addr()
886 	return ring->head & (ring->obj_num - 1);  in mcp251xfd_get_rx_head()
891 	return ring->tail & (ring->obj_num - 1);  in mcp251xfd_get_rx_tail()
896 	return ring->head - ring->tail;  in mcp251xfd_get_rx_len()
906 	return min_t(u8, len, ring->obj_num - mcp251xfd_get_rx_tail(ring));  in mcp251xfd_get_rx_linear_len()
910 	for ((n) = 0, (_obj) = &(ring)->obj[(n)]; \
911 	     (n) < (ring)->obj_num; \
912 	     (n)++, (_obj) = &(ring)->obj[(n)])
915 	for ((n) = 0, (ring) = *((priv)->rx + (n)); \
916 	     (n) < (priv)->rx_ring_num; \
917 	     (n)++, (ring) = *((priv)->rx + (n)))