/* * sun4i_can.c - CAN bus controller driver for Allwinner SUN4I&SUN7I based SoCs * * Copyright (C) 2013 Peter Chen * Copyright (C) 2015 Gerhard Bertelsmann * All rights reserved. * * Parts of this software are based on (derived from) the SJA1000 code by: * Copyright (C) 2014 Oliver Hartkopp <[email protected]> * Copyright (C) 2007 Wolfgang Grandegger <[email protected]> * Copyright (C) 2002-2007 Volkswagen Group Electronic Research * Copyright (C) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33, * 38106 Braunschweig, GERMANY * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Volkswagen nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * Alternatively, provided that this notice is retained in full, this * software may be distributed under the terms of the GNU General * Public License ("GPL") version 2, in which case the provisions of the * GPL apply INSTEAD OF those given above. * * The provided data structures and external interfaces from this code * are not restricted to be used by modules with a GPL compatible license. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * */ #include <linux/netdevice.h> #include <linux/can.h> #include <linux/can/dev.h> #include <linux/can/error.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/ethtool.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/reset.h> #define DRV_NAME … /* Registers address (physical base address 0x01C2BC00) */ #define SUN4I_REG_MSEL_ADDR … #define SUN4I_REG_CMD_ADDR … #define SUN4I_REG_STA_ADDR … #define SUN4I_REG_INT_ADDR … #define SUN4I_REG_INTEN_ADDR … #define SUN4I_REG_BTIME_ADDR … #define SUN4I_REG_TEWL_ADDR … #define SUN4I_REG_ERRC_ADDR … #define SUN4I_REG_RMCNT_ADDR … #define SUN4I_REG_RBUFSA_ADDR … #define SUN4I_REG_BUF0_ADDR … #define SUN4I_REG_BUF1_ADDR … #define SUN4I_REG_BUF2_ADDR … #define SUN4I_REG_BUF3_ADDR … #define SUN4I_REG_BUF4_ADDR … #define SUN4I_REG_BUF5_ADDR … #define SUN4I_REG_BUF6_ADDR … #define SUN4I_REG_BUF7_ADDR … #define SUN4I_REG_BUF8_ADDR … #define SUN4I_REG_BUF9_ADDR … #define SUN4I_REG_BUF10_ADDR … #define SUN4I_REG_BUF11_ADDR … #define SUN4I_REG_BUF12_ADDR … #define SUN4I_REG_ACPC_ADDR … #define SUN4I_REG_ACPM_ADDR … #define SUN4I_REG_ACPC_ADDR_D1 … #define SUN4I_REG_ACPM_ADDR_D1 … #define SUN4I_REG_RBUF_RBACK_START_ADDR … #define SUN4I_REG_RBUF_RBACK_END_ADDR … /* Controller Register Description */ /* mode select register (r/w) * offset:0x0000 default:0x0000_0001 */ #define SUN4I_MSEL_SLEEP_MODE … #define SUN4I_MSEL_WAKE_UP … #define SUN4I_MSEL_SINGLE_FILTER … #define SUN4I_MSEL_DUAL_FILTERS … #define SUN4I_MSEL_LOOPBACK_MODE … #define SUN4I_MSEL_LISTEN_ONLY_MODE … #define SUN4I_MSEL_RESET_MODE … /* command register (w) * offset:0x0004 default:0x0000_0000 */ #define SUN4I_CMD_BUS_OFF_REQ … #define SUN4I_CMD_SELF_RCV_REQ … #define SUN4I_CMD_CLEAR_OR_FLAG … #define SUN4I_CMD_RELEASE_RBUF … #define SUN4I_CMD_ABORT_REQ … #define SUN4I_CMD_TRANS_REQ … /* status register (r) * offset:0x0008 default:0x0000_003c */ #define SUN4I_STA_BIT_ERR … #define SUN4I_STA_FORM_ERR … #define SUN4I_STA_STUFF_ERR … #define SUN4I_STA_OTHER_ERR … #define SUN4I_STA_MASK_ERR … #define SUN4I_STA_ERR_DIR … #define SUN4I_STA_ERR_SEG_CODE … #define SUN4I_STA_START … #define SUN4I_STA_ID28_21 … #define SUN4I_STA_ID20_18 … #define SUN4I_STA_SRTR … #define SUN4I_STA_IDE … #define SUN4I_STA_ID17_13 … #define SUN4I_STA_ID12_5 … #define SUN4I_STA_ID4_0 … #define SUN4I_STA_RTR … #define SUN4I_STA_RB1 … #define SUN4I_STA_RB0 … #define SUN4I_STA_DLEN … #define SUN4I_STA_DATA_FIELD … #define SUN4I_STA_CRC_SEQUENCE … #define SUN4I_STA_CRC_DELIMITER … #define SUN4I_STA_ACK … #define SUN4I_STA_ACK_DELIMITER … #define SUN4I_STA_END … #define SUN4I_STA_INTERMISSION … #define SUN4I_STA_ACTIVE_ERROR … #define SUN4I_STA_PASSIVE_ERROR … #define SUN4I_STA_TOLERATE_DOMINANT_BITS … #define SUN4I_STA_ERROR_DELIMITER … #define SUN4I_STA_OVERLOAD … #define SUN4I_STA_BUS_OFF … #define SUN4I_STA_ERR_STA … #define SUN4I_STA_TRANS_BUSY … #define SUN4I_STA_RCV_BUSY … #define SUN4I_STA_TRANS_OVER … #define SUN4I_STA_TBUF_RDY … #define SUN4I_STA_DATA_ORUN … #define SUN4I_STA_RBUF_RDY … /* interrupt register (r) * offset:0x000c default:0x0000_0000 */ #define SUN4I_INT_BUS_ERR … #define SUN4I_INT_ARB_LOST … #define SUN4I_INT_ERR_PASSIVE … #define SUN4I_INT_WAKEUP … #define SUN4I_INT_DATA_OR … #define SUN4I_INT_ERR_WRN … #define SUN4I_INT_TBUF_VLD … #define SUN4I_INT_RBUF_VLD … /* interrupt enable register (r/w) * offset:0x0010 default:0x0000_0000 */ #define SUN4I_INTEN_BERR … #define SUN4I_INTEN_ARB_LOST … #define SUN4I_INTEN_ERR_PASSIVE … #define SUN4I_INTEN_WAKEUP … #define SUN4I_INTEN_OR … #define SUN4I_INTEN_ERR_WRN … #define SUN4I_INTEN_TX … #define SUN4I_INTEN_RX … /* error code */ #define SUN4I_ERR_INRCV … #define SUN4I_ERR_INTRANS … /* filter mode */ #define SUN4I_FILTER_CLOSE … #define SUN4I_SINGLE_FLTER_MODE … #define SUN4I_DUAL_FILTER_MODE … /* message buffer flags */ #define SUN4I_MSG_EFF_FLAG … #define SUN4I_MSG_RTR_FLAG … /* max. number of interrupts handled in ISR */ #define SUN4I_CAN_MAX_IRQ … #define SUN4I_MODE_MAX_RETRIES … /** * struct sun4ican_quirks - Differences between SoC variants. * * @has_reset: SoC needs reset deasserted. * @acp_offset: Offset of ACPC and ACPM registers */ struct sun4ican_quirks { … }; struct sun4ican_priv { … }; static const struct can_bittiming_const sun4ican_bittiming_const = …; static void sun4i_can_write_cmdreg(struct sun4ican_priv *priv, u8 val) { … } static int set_normal_mode(struct net_device *dev) { … } static int set_reset_mode(struct net_device *dev) { … } /* bittiming is called in reset_mode only */ static int sun4ican_set_bittiming(struct net_device *dev) { … } static int sun4ican_get_berr_counter(const struct net_device *dev, struct can_berr_counter *bec) { … } static int sun4i_can_start(struct net_device *dev) { … } static int sun4i_can_stop(struct net_device *dev) { … } static int sun4ican_set_mode(struct net_device *dev, enum can_mode mode) { … } /* transmit a CAN message * message layout in the sk_buff should be like this: * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 * [ can_id ] [flags] [len] [can data (up to 8 bytes] */ static netdev_tx_t sun4ican_start_xmit(struct sk_buff *skb, struct net_device *dev) { … } static void sun4i_can_rx(struct net_device *dev) { … } static int sun4i_can_err(struct net_device *dev, u8 isrc, u8 status) { … } static irqreturn_t sun4i_can_interrupt(int irq, void *dev_id) { … } static int sun4ican_open(struct net_device *dev) { … } static int sun4ican_close(struct net_device *dev) { … } static const struct net_device_ops sun4ican_netdev_ops = …; static const struct ethtool_ops sun4ican_ethtool_ops = …; static const struct sun4ican_quirks sun4ican_quirks_a10 = …; static const struct sun4ican_quirks sun4ican_quirks_r40 = …; static const struct sun4ican_quirks sun4ican_quirks_d1 = …; static const struct of_device_id sun4ican_of_match[] = …; MODULE_DEVICE_TABLE(of, sun4ican_of_match); static void sun4ican_remove(struct platform_device *pdev) { … } static int sun4ican_probe(struct platform_device *pdev) { … } static struct platform_driver sun4i_can_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…) …;
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