path: root/drivers/net/can/m_can/m_can.c

/*
 * CAN bus driver for Bosch M_CAN controller
 *
 * Copyright (C) 2014 Freescale Semiconductor, Inc.
 *	Dong Aisheng <b29396@freescale.com>
 *
 * Bosch M_CAN user manual can be obtained from:
 * http://www.bosch-semiconductors.de/media/pdf_1/ipmodules_1/m_can/
 * mcan_users_manual_v302.pdf
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>

#include <linux/can/dev.h>

/* napi related */
#define M_CAN_NAPI_WEIGHT	64

/* message ram configuration data length */
#define MRAM_CFG_LEN	8

/* registers definition */
enum m_can_reg {
	M_CAN_CREL	= 0x0,
	M_CAN_ENDN	= 0x4,
	M_CAN_CUST	= 0x8,
	M_CAN_FBTP	= 0xc,
	M_CAN_TEST	= 0x10,
	M_CAN_RWD	= 0x14,
	M_CAN_CCCR	= 0x18,
	M_CAN_BTP	= 0x1c,
	M_CAN_TSCC	= 0x20,
	M_CAN_TSCV	= 0x24,
	M_CAN_TOCC	= 0x28,
	M_CAN_TOCV	= 0x2c,
	M_CAN_ECR	= 0x40,
	M_CAN_PSR	= 0x44,
	M_CAN_IR	= 0x50,
	M_CAN_IE	= 0x54,
	M_CAN_ILS	= 0x58,
	M_CAN_ILE	= 0x5c,
	M_CAN_GFC	= 0x80,
	M_CAN_SIDFC	= 0x84,
	M_CAN_XIDFC	= 0x88,
	M_CAN_XIDAM	= 0x90,
	M_CAN_HPMS	= 0x94,
	M_CAN_NDAT1	= 0x98,
	M_CAN_NDAT2	= 0x9c,
	M_CAN_RXF0C	= 0xa0,
	M_CAN_RXF0S	= 0xa4,
	M_CAN_RXF0A	= 0xa8,
	M_CAN_RXBC	= 0xac,
	M_CAN_RXF1C	= 0xb0,
	M_CAN_RXF1S	= 0xb4,
	M_CAN_RXF1A	= 0xb8,
	M_CAN_RXESC	= 0xbc,
	M_CAN_TXBC	= 0xc0,
	M_CAN_TXFQS	= 0xc4,
	M_CAN_TXESC	= 0xc8,
	M_CAN_TXBRP	= 0xcc,
	M_CAN_TXBAR	= 0xd0,
	M_CAN_TXBCR	= 0xd4,
	M_CAN_TXBTO	= 0xd8,
	M_CAN_TXBCF	= 0xdc,
	M_CAN_TXBTIE	= 0xe0,
	M_CAN_TXBCIE	= 0xe4,
	M_CAN_TXEFC	= 0xf0,
	M_CAN_TXEFS	= 0xf4,
	M_CAN_TXEFA	= 0xf8,
};

/* m_can lec values */
enum m_can_lec_type {
	LEC_NO_ERROR = 0,
	LEC_STUFF_ERROR,
	LEC_FORM_ERROR,
	LEC_ACK_ERROR,
	LEC_BIT1_ERROR,
	LEC_BIT0_ERROR,
	LEC_CRC_ERROR,
	LEC_UNUSED,
};

enum m_can_mram_cfg {
	MRAM_SIDF = 0,
	MRAM_XIDF,
	MRAM_RXF0,
	MRAM_RXF1,
	MRAM_RXB,
	MRAM_TXE,
	MRAM_TXB,
	MRAM_CFG_NUM,
};

/* Fast Bit Timing & Prescaler Register (FBTP) */
#define FBTR_FBRP_MASK		0x1f
#define FBTR_FBRP_SHIFT		16
#define FBTR_FTSEG1_SHIFT	8
#define FBTR_FTSEG1_MASK	(0xf << FBTR_FTSEG1_SHIFT)
#define FBTR_FTSEG2_SHIFT	4
#define FBTR_FTSEG2_MASK	(0x7 << FBTR_FTSEG2_SHIFT)
#define FBTR_FSJW_SHIFT		0
#define FBTR_FSJW_MASK		0x3

/* Test Register (TEST) */
#define TEST_LBCK	BIT(4)

/* CC Control Register(CCCR) */
#define CCCR_TEST		BIT(7)
#define CCCR_CMR_MASK		0x3
#define CCCR_CMR_SHIFT		10
#define CCCR_CMR_CANFD		0x1
#define CCCR_CMR_CANFD_BRS	0x2
#define CCCR_CMR_CAN		0x3
#define CCCR_CME_MASK		0x3
#define CCCR_CME_SHIFT		8
#define CCCR_CME_CAN		0
#define CCCR_CME_CANFD		0x1
#define CCCR_CME_CANFD_BRS	0x2
#define CCCR_TEST		BIT(7)
#define CCCR_MON		BIT(5)
#define CCCR_CCE		BIT(1)
#define CCCR_INIT		BIT(0)
#define CCCR_CANFD		0x10

/* Bit Timing & Prescaler Register (BTP) */
#define BTR_BRP_MASK		0x3ff<