bf3af54732
The main differences compared to the MSCAN on the MPC5200 are: - More flexibility in choosing the CAN source clock and frequency: Three different clock sources can be selected: "ip", "ref" or "sys". For the latter two, a clock divider can be defined as well. If the clock source is not specified by the device tree, we first try to find an optimal CAN source clock based on the system clock. If that is not possible, the reference clock will be used. - The behavior of bus-off recovery is configurable: To comply with the usual handling of Socket-CAN bus-off recovery, "recovery on request" is selected (instead of automatic recovery). Note that only MPC5121 Rev. 2 and later is supported. Signed-off-by: Wolfgang Grandegger <wg@denx.de> Reviewed-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
302 lines
9.5 KiB
C
302 lines
9.5 KiB
C
/*
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* Definitions of consts/structs to drive the Freescale MSCAN.
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*
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* Copyright (C) 2005-2006 Andrey Volkov <avolkov@varma-el.com>,
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* Varma Electronics Oy
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the version 2 of the GNU General Public License
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __MSCAN_H__
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#define __MSCAN_H__
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#include <linux/types.h>
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/* MSCAN control register 0 (CANCTL0) bits */
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#define MSCAN_RXFRM 0x80
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#define MSCAN_RXACT 0x40
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#define MSCAN_CSWAI 0x20
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#define MSCAN_SYNCH 0x10
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#define MSCAN_TIME 0x08
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#define MSCAN_WUPE 0x04
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#define MSCAN_SLPRQ 0x02
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#define MSCAN_INITRQ 0x01
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/* MSCAN control register 1 (CANCTL1) bits */
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#define MSCAN_CANE 0x80
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#define MSCAN_CLKSRC 0x40
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#define MSCAN_LOOPB 0x20
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#define MSCAN_LISTEN 0x10
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#define MSCAN_BORM 0x08
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#define MSCAN_WUPM 0x04
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#define MSCAN_SLPAK 0x02
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#define MSCAN_INITAK 0x01
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/* Use the MPC5XXX MSCAN variant? */
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#ifdef CONFIG_PPC
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#define MSCAN_FOR_MPC5XXX
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#endif
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#ifdef MSCAN_FOR_MPC5XXX
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#define MSCAN_CLKSRC_BUS 0
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#define MSCAN_CLKSRC_XTAL MSCAN_CLKSRC
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#define MSCAN_CLKSRC_IPS MSCAN_CLKSRC
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#else
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#define MSCAN_CLKSRC_BUS MSCAN_CLKSRC
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#define MSCAN_CLKSRC_XTAL 0
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#endif
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/* MSCAN receiver flag register (CANRFLG) bits */
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#define MSCAN_WUPIF 0x80
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#define MSCAN_CSCIF 0x40
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#define MSCAN_RSTAT1 0x20
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#define MSCAN_RSTAT0 0x10
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#define MSCAN_TSTAT1 0x08
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#define MSCAN_TSTAT0 0x04
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#define MSCAN_OVRIF 0x02
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#define MSCAN_RXF 0x01
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#define MSCAN_ERR_IF (MSCAN_OVRIF | MSCAN_CSCIF)
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#define MSCAN_RSTAT_MSK (MSCAN_RSTAT1 | MSCAN_RSTAT0)
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#define MSCAN_TSTAT_MSK (MSCAN_TSTAT1 | MSCAN_TSTAT0)
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#define MSCAN_STAT_MSK (MSCAN_RSTAT_MSK | MSCAN_TSTAT_MSK)
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#define MSCAN_STATE_BUS_OFF (MSCAN_RSTAT1 | MSCAN_RSTAT0 | \
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MSCAN_TSTAT1 | MSCAN_TSTAT0)
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#define MSCAN_STATE_TX(canrflg) (((canrflg)&MSCAN_TSTAT_MSK)>>2)
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#define MSCAN_STATE_RX(canrflg) (((canrflg)&MSCAN_RSTAT_MSK)>>4)
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#define MSCAN_STATE_ACTIVE 0
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#define MSCAN_STATE_WARNING 1
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#define MSCAN_STATE_PASSIVE 2
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#define MSCAN_STATE_BUSOFF 3
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/* MSCAN receiver interrupt enable register (CANRIER) bits */
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#define MSCAN_WUPIE 0x80
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#define MSCAN_CSCIE 0x40
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#define MSCAN_RSTATE1 0x20
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#define MSCAN_RSTATE0 0x10
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#define MSCAN_TSTATE1 0x08
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#define MSCAN_TSTATE0 0x04
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#define MSCAN_OVRIE 0x02
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#define MSCAN_RXFIE 0x01
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/* MSCAN transmitter flag register (CANTFLG) bits */
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#define MSCAN_TXE2 0x04
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#define MSCAN_TXE1 0x02
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#define MSCAN_TXE0 0x01
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#define MSCAN_TXE (MSCAN_TXE2 | MSCAN_TXE1 | MSCAN_TXE0)
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/* MSCAN transmitter interrupt enable register (CANTIER) bits */
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#define MSCAN_TXIE2 0x04
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#define MSCAN_TXIE1 0x02
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#define MSCAN_TXIE0 0x01
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#define MSCAN_TXIE (MSCAN_TXIE2 | MSCAN_TXIE1 | MSCAN_TXIE0)
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/* MSCAN transmitter message abort request (CANTARQ) bits */
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#define MSCAN_ABTRQ2 0x04
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#define MSCAN_ABTRQ1 0x02
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#define MSCAN_ABTRQ0 0x01
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/* MSCAN transmitter message abort ack (CANTAAK) bits */
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#define MSCAN_ABTAK2 0x04
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#define MSCAN_ABTAK1 0x02
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#define MSCAN_ABTAK0 0x01
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/* MSCAN transmit buffer selection (CANTBSEL) bits */
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#define MSCAN_TX2 0x04
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#define MSCAN_TX1 0x02
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#define MSCAN_TX0 0x01
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/* MSCAN ID acceptance control register (CANIDAC) bits */
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#define MSCAN_IDAM1 0x20
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#define MSCAN_IDAM0 0x10
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#define MSCAN_IDHIT2 0x04
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#define MSCAN_IDHIT1 0x02
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#define MSCAN_IDHIT0 0x01
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#define MSCAN_AF_32BIT 0x00
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#define MSCAN_AF_16BIT MSCAN_IDAM0
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#define MSCAN_AF_8BIT MSCAN_IDAM1
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#define MSCAN_AF_CLOSED (MSCAN_IDAM0|MSCAN_IDAM1)
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#define MSCAN_AF_MASK (~(MSCAN_IDAM0|MSCAN_IDAM1))
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/* MSCAN Miscellaneous Register (CANMISC) bits */
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#define MSCAN_BOHOLD 0x01
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/* MSCAN Identifier Register (IDR) bits */
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#define MSCAN_SFF_RTR_SHIFT 4
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#define MSCAN_EFF_RTR_SHIFT 0
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#define MSCAN_EFF_FLAGS 0x18 /* IDE + SRR */
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#ifdef MSCAN_FOR_MPC5XXX
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#define _MSCAN_RESERVED_(n, num) u8 _res##n[num]
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#define _MSCAN_RESERVED_DSR_SIZE 2
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#else
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#define _MSCAN_RESERVED_(n, num)
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#define _MSCAN_RESERVED_DSR_SIZE 0
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#endif
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/* Structure of the hardware registers */
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struct mscan_regs {
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/* (see doc S12MSCANV3/D) MPC5200 MSCAN */
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u8 canctl0; /* + 0x00 0x00 */
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u8 canctl1; /* + 0x01 0x01 */
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_MSCAN_RESERVED_(1, 2); /* + 0x02 */
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u8 canbtr0; /* + 0x04 0x02 */
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u8 canbtr1; /* + 0x05 0x03 */
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_MSCAN_RESERVED_(2, 2); /* + 0x06 */
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u8 canrflg; /* + 0x08 0x04 */
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u8 canrier; /* + 0x09 0x05 */
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_MSCAN_RESERVED_(3, 2); /* + 0x0a */
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u8 cantflg; /* + 0x0c 0x06 */
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u8 cantier; /* + 0x0d 0x07 */
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_MSCAN_RESERVED_(4, 2); /* + 0x0e */
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u8 cantarq; /* + 0x10 0x08 */
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u8 cantaak; /* + 0x11 0x09 */
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_MSCAN_RESERVED_(5, 2); /* + 0x12 */
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u8 cantbsel; /* + 0x14 0x0a */
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u8 canidac; /* + 0x15 0x0b */
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u8 reserved; /* + 0x16 0x0c */
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_MSCAN_RESERVED_(6, 2); /* + 0x17 */
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u8 canmisc; /* + 0x19 0x0d */
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_MSCAN_RESERVED_(7, 2); /* + 0x1a */
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u8 canrxerr; /* + 0x1c 0x0e */
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u8 cantxerr; /* + 0x1d 0x0f */
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_MSCAN_RESERVED_(8, 2); /* + 0x1e */
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u16 canidar1_0; /* + 0x20 0x10 */
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_MSCAN_RESERVED_(9, 2); /* + 0x22 */
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u16 canidar3_2; /* + 0x24 0x12 */
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_MSCAN_RESERVED_(10, 2); /* + 0x26 */
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u16 canidmr1_0; /* + 0x28 0x14 */
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_MSCAN_RESERVED_(11, 2); /* + 0x2a */
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u16 canidmr3_2; /* + 0x2c 0x16 */
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_MSCAN_RESERVED_(12, 2); /* + 0x2e */
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u16 canidar5_4; /* + 0x30 0x18 */
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_MSCAN_RESERVED_(13, 2); /* + 0x32 */
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u16 canidar7_6; /* + 0x34 0x1a */
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_MSCAN_RESERVED_(14, 2); /* + 0x36 */
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u16 canidmr5_4; /* + 0x38 0x1c */
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_MSCAN_RESERVED_(15, 2); /* + 0x3a */
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u16 canidmr7_6; /* + 0x3c 0x1e */
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_MSCAN_RESERVED_(16, 2); /* + 0x3e */
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struct {
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u16 idr1_0; /* + 0x40 0x20 */
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_MSCAN_RESERVED_(17, 2); /* + 0x42 */
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u16 idr3_2; /* + 0x44 0x22 */
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_MSCAN_RESERVED_(18, 2); /* + 0x46 */
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u16 dsr1_0; /* + 0x48 0x24 */
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_MSCAN_RESERVED_(19, 2); /* + 0x4a */
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u16 dsr3_2; /* + 0x4c 0x26 */
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_MSCAN_RESERVED_(20, 2); /* + 0x4e */
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u16 dsr5_4; /* + 0x50 0x28 */
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_MSCAN_RESERVED_(21, 2); /* + 0x52 */
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u16 dsr7_6; /* + 0x54 0x2a */
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_MSCAN_RESERVED_(22, 2); /* + 0x56 */
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u8 dlr; /* + 0x58 0x2c */
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u8 reserved; /* + 0x59 0x2d */
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_MSCAN_RESERVED_(23, 2); /* + 0x5a */
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u16 time; /* + 0x5c 0x2e */
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} rx;
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_MSCAN_RESERVED_(24, 2); /* + 0x5e */
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struct {
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u16 idr1_0; /* + 0x60 0x30 */
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_MSCAN_RESERVED_(25, 2); /* + 0x62 */
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u16 idr3_2; /* + 0x64 0x32 */
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_MSCAN_RESERVED_(26, 2); /* + 0x66 */
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u16 dsr1_0; /* + 0x68 0x34 */
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_MSCAN_RESERVED_(27, 2); /* + 0x6a */
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u16 dsr3_2; /* + 0x6c 0x36 */
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_MSCAN_RESERVED_(28, 2); /* + 0x6e */
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u16 dsr5_4; /* + 0x70 0x38 */
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_MSCAN_RESERVED_(29, 2); /* + 0x72 */
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u16 dsr7_6; /* + 0x74 0x3a */
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_MSCAN_RESERVED_(30, 2); /* + 0x76 */
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u8 dlr; /* + 0x78 0x3c */
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u8 tbpr; /* + 0x79 0x3d */
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_MSCAN_RESERVED_(31, 2); /* + 0x7a */
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u16 time; /* + 0x7c 0x3e */
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} tx;
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_MSCAN_RESERVED_(32, 2); /* + 0x7e */
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} __attribute__ ((packed));
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#undef _MSCAN_RESERVED_
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#define MSCAN_REGION sizeof(struct mscan)
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#define MSCAN_NORMAL_MODE 0
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#define MSCAN_SLEEP_MODE MSCAN_SLPRQ
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#define MSCAN_INIT_MODE (MSCAN_INITRQ | MSCAN_SLPRQ)
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#define MSCAN_POWEROFF_MODE (MSCAN_CSWAI | MSCAN_SLPRQ)
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#define MSCAN_SET_MODE_RETRIES 255
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#define MSCAN_ECHO_SKB_MAX 3
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#define MSCAN_RX_INTS_ENABLE (MSCAN_OVRIE | MSCAN_RXFIE | MSCAN_CSCIE | \
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MSCAN_RSTATE1 | MSCAN_RSTATE0 | \
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MSCAN_TSTATE1 | MSCAN_TSTATE0)
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/* MSCAN type variants */
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enum {
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MSCAN_TYPE_MPC5200,
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MSCAN_TYPE_MPC5121
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};
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#define BTR0_BRP_MASK 0x3f
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#define BTR0_SJW_SHIFT 6
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#define BTR0_SJW_MASK (0x3 << BTR0_SJW_SHIFT)
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#define BTR1_TSEG1_MASK 0xf
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#define BTR1_TSEG2_SHIFT 4
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#define BTR1_TSEG2_MASK (0x7 << BTR1_TSEG2_SHIFT)
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#define BTR1_SAM_SHIFT 7
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#define BTR0_SET_BRP(brp) (((brp) - 1) & BTR0_BRP_MASK)
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#define BTR0_SET_SJW(sjw) ((((sjw) - 1) << BTR0_SJW_SHIFT) & \
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BTR0_SJW_MASK)
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#define BTR1_SET_TSEG1(tseg1) (((tseg1) - 1) & BTR1_TSEG1_MASK)
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#define BTR1_SET_TSEG2(tseg2) ((((tseg2) - 1) << BTR1_TSEG2_SHIFT) & \
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BTR1_TSEG2_MASK)
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#define BTR1_SET_SAM(sam) ((sam) ? 1 << BTR1_SAM_SHIFT : 0)
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#define F_RX_PROGRESS 0
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#define F_TX_PROGRESS 1
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#define F_TX_WAIT_ALL 2
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#define TX_QUEUE_SIZE 3
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struct tx_queue_entry {
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struct list_head list;
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u8 mask;
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u8 id;
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};
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struct mscan_priv {
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struct can_priv can; /* must be the first member */
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unsigned int type; /* MSCAN type variants */
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long open_time;
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unsigned long flags;
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void __iomem *reg_base; /* ioremap'ed address to registers */
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u8 shadow_statflg;
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u8 shadow_canrier;
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u8 cur_pri;
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u8 prev_buf_id;
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u8 tx_active;
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struct list_head tx_head;
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struct tx_queue_entry tx_queue[TX_QUEUE_SIZE];
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struct napi_struct napi;
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};
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extern struct net_device *alloc_mscandev(void);
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extern int register_mscandev(struct net_device *dev, int mscan_clksrc);
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extern void unregister_mscandev(struct net_device *dev);
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#endif /* __MSCAN_H__ */
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