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1054 lines
29 KiB
1054 lines
29 KiB
/* |
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* CAN bus driver for IFI CANFD controller |
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* |
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* Copyright (C) 2016 Marek Vasut <[email protected]> |
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* |
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* Details about this controller can be found at |
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* http://www.ifi-pld.de/IP/CANFD/canfd.html |
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* |
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* This file is licensed under the terms of the GNU General Public |
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* License version 2. This program is licensed "as is" without any |
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* warranty of any kind, whether express or implied. |
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*/ |
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#include <linux/clk.h> |
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#include <linux/delay.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/netdevice.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/can/dev.h> |
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#define IFI_CANFD_STCMD 0x0 |
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#define IFI_CANFD_STCMD_HARDRESET 0xDEADCAFD |
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#define IFI_CANFD_STCMD_ENABLE BIT(0) |
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#define IFI_CANFD_STCMD_ERROR_ACTIVE BIT(2) |
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#define IFI_CANFD_STCMD_ERROR_PASSIVE BIT(3) |
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#define IFI_CANFD_STCMD_BUSOFF BIT(4) |
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#define IFI_CANFD_STCMD_ERROR_WARNING BIT(5) |
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#define IFI_CANFD_STCMD_BUSMONITOR BIT(16) |
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#define IFI_CANFD_STCMD_LOOPBACK BIT(18) |
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#define IFI_CANFD_STCMD_DISABLE_CANFD BIT(24) |
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#define IFI_CANFD_STCMD_ENABLE_ISO BIT(25) |
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#define IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING BIT(26) |
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#define IFI_CANFD_STCMD_NORMAL_MODE ((u32)BIT(31)) |
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#define IFI_CANFD_RXSTCMD 0x4 |
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#define IFI_CANFD_RXSTCMD_REMOVE_MSG BIT(0) |
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#define IFI_CANFD_RXSTCMD_RESET BIT(7) |
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#define IFI_CANFD_RXSTCMD_EMPTY BIT(8) |
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#define IFI_CANFD_RXSTCMD_OVERFLOW BIT(13) |
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#define IFI_CANFD_TXSTCMD 0x8 |
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#define IFI_CANFD_TXSTCMD_ADD_MSG BIT(0) |
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#define IFI_CANFD_TXSTCMD_HIGH_PRIO BIT(1) |
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#define IFI_CANFD_TXSTCMD_RESET BIT(7) |
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#define IFI_CANFD_TXSTCMD_EMPTY BIT(8) |
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#define IFI_CANFD_TXSTCMD_FULL BIT(12) |
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#define IFI_CANFD_TXSTCMD_OVERFLOW BIT(13) |
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#define IFI_CANFD_INTERRUPT 0xc |
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#define IFI_CANFD_INTERRUPT_ERROR_BUSOFF BIT(0) |
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#define IFI_CANFD_INTERRUPT_ERROR_WARNING BIT(1) |
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#define IFI_CANFD_INTERRUPT_ERROR_STATE_CHG BIT(2) |
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#define IFI_CANFD_INTERRUPT_ERROR_REC_TEC_INC BIT(3) |
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#define IFI_CANFD_INTERRUPT_ERROR_COUNTER BIT(10) |
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#define IFI_CANFD_INTERRUPT_TXFIFO_EMPTY BIT(16) |
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#define IFI_CANFD_INTERRUPT_TXFIFO_REMOVE BIT(22) |
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#define IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY BIT(24) |
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#define IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER BIT(25) |
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#define IFI_CANFD_INTERRUPT_SET_IRQ ((u32)BIT(31)) |
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#define IFI_CANFD_IRQMASK 0x10 |
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#define IFI_CANFD_IRQMASK_ERROR_BUSOFF BIT(0) |
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#define IFI_CANFD_IRQMASK_ERROR_WARNING BIT(1) |
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#define IFI_CANFD_IRQMASK_ERROR_STATE_CHG BIT(2) |
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#define IFI_CANFD_IRQMASK_ERROR_REC_TEC_INC BIT(3) |
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#define IFI_CANFD_IRQMASK_SET_ERR BIT(7) |
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#define IFI_CANFD_IRQMASK_SET_TS BIT(15) |
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#define IFI_CANFD_IRQMASK_TXFIFO_EMPTY BIT(16) |
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#define IFI_CANFD_IRQMASK_SET_TX BIT(23) |
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#define IFI_CANFD_IRQMASK_RXFIFO_NEMPTY BIT(24) |
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#define IFI_CANFD_IRQMASK_SET_RX ((u32)BIT(31)) |
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#define IFI_CANFD_TIME 0x14 |
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#define IFI_CANFD_FTIME 0x18 |
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#define IFI_CANFD_TIME_TIMEB_OFF 0 |
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#define IFI_CANFD_TIME_TIMEA_OFF 8 |
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#define IFI_CANFD_TIME_PRESCALE_OFF 16 |
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#define IFI_CANFD_TIME_SJW_OFF_7_9_8_8 25 |
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#define IFI_CANFD_TIME_SJW_OFF_4_12_6_6 28 |
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#define IFI_CANFD_TIME_SET_SJW_4_12_6_6 BIT(6) |
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#define IFI_CANFD_TIME_SET_TIMEB_4_12_6_6 BIT(7) |
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#define IFI_CANFD_TIME_SET_PRESC_4_12_6_6 BIT(14) |
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#define IFI_CANFD_TIME_SET_TIMEA_4_12_6_6 BIT(15) |
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#define IFI_CANFD_TDELAY 0x1c |
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#define IFI_CANFD_TDELAY_DEFAULT 0xb |
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#define IFI_CANFD_TDELAY_MASK 0x3fff |
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#define IFI_CANFD_TDELAY_ABS BIT(14) |
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#define IFI_CANFD_TDELAY_EN BIT(15) |
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#define IFI_CANFD_ERROR 0x20 |
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#define IFI_CANFD_ERROR_TX_OFFSET 0 |
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#define IFI_CANFD_ERROR_TX_MASK 0xff |
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#define IFI_CANFD_ERROR_RX_OFFSET 16 |
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#define IFI_CANFD_ERROR_RX_MASK 0xff |
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#define IFI_CANFD_ERRCNT 0x24 |
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#define IFI_CANFD_SUSPEND 0x28 |
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#define IFI_CANFD_REPEAT 0x2c |
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#define IFI_CANFD_TRAFFIC 0x30 |
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#define IFI_CANFD_TSCONTROL 0x34 |
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#define IFI_CANFD_TSC 0x38 |
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#define IFI_CANFD_TST 0x3c |
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#define IFI_CANFD_RES1 0x40 |
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#define IFI_CANFD_ERROR_CTR 0x44 |
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#define IFI_CANFD_ERROR_CTR_UNLOCK_MAGIC 0x21302899 |
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#define IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST BIT(0) |
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#define IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST BIT(1) |
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#define IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST BIT(2) |
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#define IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST BIT(3) |
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#define IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST BIT(4) |
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#define IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST BIT(5) |
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#define IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST BIT(6) |
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#define IFI_CANFD_ERROR_CTR_OVERLOAD_ALL BIT(8) |
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#define IFI_CANFD_ERROR_CTR_ACK_ERROR_ALL BIT(9) |
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#define IFI_CANFD_ERROR_CTR_BIT0_ERROR_ALL BIT(10) |
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#define IFI_CANFD_ERROR_CTR_BIT1_ERROR_ALL BIT(11) |
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#define IFI_CANFD_ERROR_CTR_STUFF_ERROR_ALL BIT(12) |
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#define IFI_CANFD_ERROR_CTR_CRC_ERROR_ALL BIT(13) |
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#define IFI_CANFD_ERROR_CTR_FORM_ERROR_ALL BIT(14) |
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#define IFI_CANFD_ERROR_CTR_BITPOSITION_OFFSET 16 |
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#define IFI_CANFD_ERROR_CTR_BITPOSITION_MASK 0xff |
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#define IFI_CANFD_ERROR_CTR_ER_RESET BIT(30) |
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#define IFI_CANFD_ERROR_CTR_ER_ENABLE ((u32)BIT(31)) |
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#define IFI_CANFD_PAR 0x48 |
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#define IFI_CANFD_CANCLOCK 0x4c |
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#define IFI_CANFD_SYSCLOCK 0x50 |
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#define IFI_CANFD_VER 0x54 |
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#define IFI_CANFD_VER_REV_MASK 0xff |
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#define IFI_CANFD_VER_REV_MIN_SUPPORTED 0x15 |
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#define IFI_CANFD_IP_ID 0x58 |
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#define IFI_CANFD_IP_ID_VALUE 0xD073CAFD |
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#define IFI_CANFD_TEST 0x5c |
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#define IFI_CANFD_RXFIFO_TS_63_32 0x60 |
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#define IFI_CANFD_RXFIFO_TS_31_0 0x64 |
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#define IFI_CANFD_RXFIFO_DLC 0x68 |
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#define IFI_CANFD_RXFIFO_DLC_DLC_OFFSET 0 |
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#define IFI_CANFD_RXFIFO_DLC_DLC_MASK 0xf |
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#define IFI_CANFD_RXFIFO_DLC_RTR BIT(4) |
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#define IFI_CANFD_RXFIFO_DLC_EDL BIT(5) |
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#define IFI_CANFD_RXFIFO_DLC_BRS BIT(6) |
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#define IFI_CANFD_RXFIFO_DLC_ESI BIT(7) |
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#define IFI_CANFD_RXFIFO_DLC_OBJ_OFFSET 8 |
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#define IFI_CANFD_RXFIFO_DLC_OBJ_MASK 0x1ff |
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#define IFI_CANFD_RXFIFO_DLC_FNR_OFFSET 24 |
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#define IFI_CANFD_RXFIFO_DLC_FNR_MASK 0xff |
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#define IFI_CANFD_RXFIFO_ID 0x6c |
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#define IFI_CANFD_RXFIFO_ID_ID_OFFSET 0 |
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#define IFI_CANFD_RXFIFO_ID_ID_STD_MASK CAN_SFF_MASK |
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#define IFI_CANFD_RXFIFO_ID_ID_STD_OFFSET 0 |
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#define IFI_CANFD_RXFIFO_ID_ID_STD_WIDTH 10 |
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#define IFI_CANFD_RXFIFO_ID_ID_XTD_MASK CAN_EFF_MASK |
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#define IFI_CANFD_RXFIFO_ID_ID_XTD_OFFSET 11 |
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#define IFI_CANFD_RXFIFO_ID_ID_XTD_WIDTH 18 |
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#define IFI_CANFD_RXFIFO_ID_IDE BIT(29) |
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#define IFI_CANFD_RXFIFO_DATA 0x70 /* 0x70..0xac */ |
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#define IFI_CANFD_TXFIFO_SUSPEND_US 0xb0 |
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#define IFI_CANFD_TXFIFO_REPEATCOUNT 0xb4 |
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#define IFI_CANFD_TXFIFO_DLC 0xb8 |
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#define IFI_CANFD_TXFIFO_DLC_DLC_OFFSET 0 |
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#define IFI_CANFD_TXFIFO_DLC_DLC_MASK 0xf |
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#define IFI_CANFD_TXFIFO_DLC_RTR BIT(4) |
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#define IFI_CANFD_TXFIFO_DLC_EDL BIT(5) |
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#define IFI_CANFD_TXFIFO_DLC_BRS BIT(6) |
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#define IFI_CANFD_TXFIFO_DLC_FNR_OFFSET 24 |
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#define IFI_CANFD_TXFIFO_DLC_FNR_MASK 0xff |
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#define IFI_CANFD_TXFIFO_ID 0xbc |
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#define IFI_CANFD_TXFIFO_ID_ID_OFFSET 0 |
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#define IFI_CANFD_TXFIFO_ID_ID_STD_MASK CAN_SFF_MASK |
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#define IFI_CANFD_TXFIFO_ID_ID_STD_OFFSET 0 |
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#define IFI_CANFD_TXFIFO_ID_ID_STD_WIDTH 10 |
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#define IFI_CANFD_TXFIFO_ID_ID_XTD_MASK CAN_EFF_MASK |
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#define IFI_CANFD_TXFIFO_ID_ID_XTD_OFFSET 11 |
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#define IFI_CANFD_TXFIFO_ID_ID_XTD_WIDTH 18 |
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#define IFI_CANFD_TXFIFO_ID_IDE BIT(29) |
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#define IFI_CANFD_TXFIFO_DATA 0xc0 /* 0xb0..0xfc */ |
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#define IFI_CANFD_FILTER_MASK(n) (0x800 + ((n) * 8) + 0) |
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#define IFI_CANFD_FILTER_MASK_EXT BIT(29) |
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#define IFI_CANFD_FILTER_MASK_EDL BIT(30) |
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#define IFI_CANFD_FILTER_MASK_VALID ((u32)BIT(31)) |
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#define IFI_CANFD_FILTER_IDENT(n) (0x800 + ((n) * 8) + 4) |
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#define IFI_CANFD_FILTER_IDENT_IDE BIT(29) |
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#define IFI_CANFD_FILTER_IDENT_CANFD BIT(30) |
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#define IFI_CANFD_FILTER_IDENT_VALID ((u32)BIT(31)) |
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/* IFI CANFD private data structure */ |
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struct ifi_canfd_priv { |
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struct can_priv can; /* must be the first member */ |
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struct napi_struct napi; |
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struct net_device *ndev; |
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void __iomem *base; |
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}; |
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static void ifi_canfd_irq_enable(struct net_device *ndev, bool enable) |
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{ |
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struct ifi_canfd_priv *priv = netdev_priv(ndev); |
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u32 enirq = 0; |
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if (enable) { |
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enirq = IFI_CANFD_IRQMASK_TXFIFO_EMPTY | |
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IFI_CANFD_IRQMASK_RXFIFO_NEMPTY | |
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IFI_CANFD_IRQMASK_ERROR_STATE_CHG | |
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IFI_CANFD_IRQMASK_ERROR_WARNING | |
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IFI_CANFD_IRQMASK_ERROR_BUSOFF; |
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if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) |
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enirq |= IFI_CANFD_INTERRUPT_ERROR_COUNTER; |
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} |
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writel(IFI_CANFD_IRQMASK_SET_ERR | |
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IFI_CANFD_IRQMASK_SET_TS | |
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IFI_CANFD_IRQMASK_SET_TX | |
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IFI_CANFD_IRQMASK_SET_RX | enirq, |
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priv->base + IFI_CANFD_IRQMASK); |
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} |
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static void ifi_canfd_read_fifo(struct net_device *ndev) |
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{ |
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struct net_device_stats *stats = &ndev->stats; |
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struct ifi_canfd_priv *priv = netdev_priv(ndev); |
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struct canfd_frame *cf; |
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struct sk_buff *skb; |
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const u32 rx_irq_mask = IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY | |
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IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER; |
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u32 rxdlc, rxid; |
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u32 dlc, id; |
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int i; |
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rxdlc = readl(priv->base + IFI_CANFD_RXFIFO_DLC); |
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if (rxdlc & IFI_CANFD_RXFIFO_DLC_EDL) |
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skb = alloc_canfd_skb(ndev, &cf); |
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else |
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skb = alloc_can_skb(ndev, (struct can_frame **)&cf); |
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if (!skb) { |
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stats->rx_dropped++; |
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return; |
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} |
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dlc = (rxdlc >> IFI_CANFD_RXFIFO_DLC_DLC_OFFSET) & |
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IFI_CANFD_RXFIFO_DLC_DLC_MASK; |
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if (rxdlc & IFI_CANFD_RXFIFO_DLC_EDL) |
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cf->len = can_fd_dlc2len(dlc); |
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else |
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cf->len = can_cc_dlc2len(dlc); |
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rxid = readl(priv->base + IFI_CANFD_RXFIFO_ID); |
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id = (rxid >> IFI_CANFD_RXFIFO_ID_ID_OFFSET); |
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if (id & IFI_CANFD_RXFIFO_ID_IDE) { |
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id &= IFI_CANFD_RXFIFO_ID_ID_XTD_MASK; |
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/* |
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* In case the Extended ID frame is received, the standard |
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* and extended part of the ID are swapped in the register, |
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* so swap them back to obtain the correct ID. |
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*/ |
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id = (id >> IFI_CANFD_RXFIFO_ID_ID_XTD_OFFSET) | |
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((id & IFI_CANFD_RXFIFO_ID_ID_STD_MASK) << |
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IFI_CANFD_RXFIFO_ID_ID_XTD_WIDTH); |
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id |= CAN_EFF_FLAG; |
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} else { |
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id &= IFI_CANFD_RXFIFO_ID_ID_STD_MASK; |
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} |
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cf->can_id = id; |
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if (rxdlc & IFI_CANFD_RXFIFO_DLC_ESI) { |
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cf->flags |= CANFD_ESI; |
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netdev_dbg(ndev, "ESI Error\n"); |
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} |
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if (!(rxdlc & IFI_CANFD_RXFIFO_DLC_EDL) && |
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(rxdlc & IFI_CANFD_RXFIFO_DLC_RTR)) { |
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cf->can_id |= CAN_RTR_FLAG; |
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} else { |
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if (rxdlc & IFI_CANFD_RXFIFO_DLC_BRS) |
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cf->flags |= CANFD_BRS; |
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for (i = 0; i < cf->len; i += 4) { |
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*(u32 *)(cf->data + i) = |
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readl(priv->base + IFI_CANFD_RXFIFO_DATA + i); |
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} |
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} |
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/* Remove the packet from FIFO */ |
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writel(IFI_CANFD_RXSTCMD_REMOVE_MSG, priv->base + IFI_CANFD_RXSTCMD); |
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writel(rx_irq_mask, priv->base + IFI_CANFD_INTERRUPT); |
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stats->rx_packets++; |
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stats->rx_bytes += cf->len; |
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netif_receive_skb(skb); |
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} |
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static int ifi_canfd_do_rx_poll(struct net_device *ndev, int quota) |
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{ |
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struct ifi_canfd_priv *priv = netdev_priv(ndev); |
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u32 pkts = 0; |
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u32 rxst; |
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rxst = readl(priv->base + IFI_CANFD_RXSTCMD); |
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if (rxst & IFI_CANFD_RXSTCMD_EMPTY) { |
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netdev_dbg(ndev, "No messages in RX FIFO\n"); |
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return 0; |
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} |
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for (;;) { |
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if (rxst & IFI_CANFD_RXSTCMD_EMPTY) |
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break; |
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if (quota <= 0) |
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break; |
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ifi_canfd_read_fifo(ndev); |
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quota--; |
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pkts++; |
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rxst = readl(priv->base + IFI_CANFD_RXSTCMD); |
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} |
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if (pkts) |
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can_led_event(ndev, CAN_LED_EVENT_RX); |
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return pkts; |
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} |
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static int ifi_canfd_handle_lost_msg(struct net_device *ndev) |
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{ |
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struct net_device_stats *stats = &ndev->stats; |
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struct sk_buff *skb; |
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struct can_frame *frame; |
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netdev_err(ndev, "RX FIFO overflow, message(s) lost.\n"); |
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stats->rx_errors++; |
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stats->rx_over_errors++; |
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skb = alloc_can_err_skb(ndev, &frame); |
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if (unlikely(!skb)) |
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return 0; |
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frame->can_id |= CAN_ERR_CRTL; |
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frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; |
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netif_receive_skb(skb); |
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return 1; |
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} |
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static int ifi_canfd_handle_lec_err(struct net_device *ndev) |
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{ |
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struct ifi_canfd_priv *priv = netdev_priv(ndev); |
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struct net_device_stats *stats = &ndev->stats; |
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struct can_frame *cf; |
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struct sk_buff *skb; |
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u32 errctr = readl(priv->base + IFI_CANFD_ERROR_CTR); |
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const u32 errmask = IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST | |
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IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST | |
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IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST | |
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IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST | |
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IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST | |
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IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST | |
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IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST; |
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if (!(errctr & errmask)) /* No error happened. */ |
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return 0; |
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priv->can.can_stats.bus_error++; |
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stats->rx_errors++; |
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/* Propagate the error condition to the CAN stack. */ |
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skb = alloc_can_err_skb(ndev, &cf); |
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if (unlikely(!skb)) |
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return 0; |
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|
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/* Read the error counter register and check for new errors. */ |
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cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; |
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if (errctr & IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST) |
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cf->data[2] |= CAN_ERR_PROT_OVERLOAD; |
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if (errctr & IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST) |
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cf->data[3] = CAN_ERR_PROT_LOC_ACK; |
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if (errctr & IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST) |
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cf->data[2] |= CAN_ERR_PROT_BIT0; |
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if (errctr & IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST) |
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cf->data[2] |= CAN_ERR_PROT_BIT1; |
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if (errctr & IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST) |
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cf->data[2] |= CAN_ERR_PROT_STUFF; |
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if (errctr & IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST) |
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cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; |
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if (errctr & IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST) |
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cf->data[2] |= CAN_ERR_PROT_FORM; |
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/* Reset the error counter, ack the IRQ and re-enable the counter. */ |
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writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR); |
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writel(IFI_CANFD_INTERRUPT_ERROR_COUNTER, |
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priv->base + IFI_CANFD_INTERRUPT); |
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writel(IFI_CANFD_ERROR_CTR_ER_ENABLE, priv->base + IFI_CANFD_ERROR_CTR); |
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stats->rx_packets++; |
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stats->rx_bytes += cf->len; |
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netif_receive_skb(skb); |
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|
|
return 1; |
|
} |
|
|
|
static int ifi_canfd_get_berr_counter(const struct net_device *ndev, |
|
struct can_berr_counter *bec) |
|
{ |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
u32 err; |
|
|
|
err = readl(priv->base + IFI_CANFD_ERROR); |
|
bec->rxerr = (err >> IFI_CANFD_ERROR_RX_OFFSET) & |
|
IFI_CANFD_ERROR_RX_MASK; |
|
bec->txerr = (err >> IFI_CANFD_ERROR_TX_OFFSET) & |
|
IFI_CANFD_ERROR_TX_MASK; |
|
|
|
return 0; |
|
} |
|
|
|
static int ifi_canfd_handle_state_change(struct net_device *ndev, |
|
enum can_state new_state) |
|
{ |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
struct net_device_stats *stats = &ndev->stats; |
|
struct can_frame *cf; |
|
struct sk_buff *skb; |
|
struct can_berr_counter bec; |
|
|
|
switch (new_state) { |
|
case CAN_STATE_ERROR_ACTIVE: |
|
/* error active state */ |
|
priv->can.can_stats.error_warning++; |
|
priv->can.state = CAN_STATE_ERROR_ACTIVE; |
|
break; |
|
case CAN_STATE_ERROR_WARNING: |
|
/* error warning state */ |
|
priv->can.can_stats.error_warning++; |
|
priv->can.state = CAN_STATE_ERROR_WARNING; |
|
break; |
|
case CAN_STATE_ERROR_PASSIVE: |
|
/* error passive state */ |
|
priv->can.can_stats.error_passive++; |
|
priv->can.state = CAN_STATE_ERROR_PASSIVE; |
|
break; |
|
case CAN_STATE_BUS_OFF: |
|
/* bus-off state */ |
|
priv->can.state = CAN_STATE_BUS_OFF; |
|
ifi_canfd_irq_enable(ndev, 0); |
|
priv->can.can_stats.bus_off++; |
|
can_bus_off(ndev); |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
/* propagate the error condition to the CAN stack */ |
|
skb = alloc_can_err_skb(ndev, &cf); |
|
if (unlikely(!skb)) |
|
return 0; |
|
|
|
ifi_canfd_get_berr_counter(ndev, &bec); |
|
|
|
switch (new_state) { |
|
case CAN_STATE_ERROR_WARNING: |
|
/* error warning state */ |
|
cf->can_id |= CAN_ERR_CRTL; |
|
cf->data[1] = (bec.txerr > bec.rxerr) ? |
|
CAN_ERR_CRTL_TX_WARNING : |
|
CAN_ERR_CRTL_RX_WARNING; |
|
cf->data[6] = bec.txerr; |
|
cf->data[7] = bec.rxerr; |
|
break; |
|
case CAN_STATE_ERROR_PASSIVE: |
|
/* error passive state */ |
|
cf->can_id |= CAN_ERR_CRTL; |
|
cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE; |
|
if (bec.txerr > 127) |
|
cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE; |
|
cf->data[6] = bec.txerr; |
|
cf->data[7] = bec.rxerr; |
|
break; |
|
case CAN_STATE_BUS_OFF: |
|
/* bus-off state */ |
|
cf->can_id |= CAN_ERR_BUSOFF; |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
stats->rx_packets++; |
|
stats->rx_bytes += cf->len; |
|
netif_receive_skb(skb); |
|
|
|
return 1; |
|
} |
|
|
|
static int ifi_canfd_handle_state_errors(struct net_device *ndev) |
|
{ |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
u32 stcmd = readl(priv->base + IFI_CANFD_STCMD); |
|
int work_done = 0; |
|
|
|
if ((stcmd & IFI_CANFD_STCMD_ERROR_ACTIVE) && |
|
(priv->can.state != CAN_STATE_ERROR_ACTIVE)) { |
|
netdev_dbg(ndev, "Error, entered active state\n"); |
|
work_done += ifi_canfd_handle_state_change(ndev, |
|
CAN_STATE_ERROR_ACTIVE); |
|
} |
|
|
|
if ((stcmd & IFI_CANFD_STCMD_ERROR_WARNING) && |
|
(priv->can.state != CAN_STATE_ERROR_WARNING)) { |
|
netdev_dbg(ndev, "Error, entered warning state\n"); |
|
work_done += ifi_canfd_handle_state_change(ndev, |
|
CAN_STATE_ERROR_WARNING); |
|
} |
|
|
|
if ((stcmd & IFI_CANFD_STCMD_ERROR_PASSIVE) && |
|
(priv->can.state != CAN_STATE_ERROR_PASSIVE)) { |
|
netdev_dbg(ndev, "Error, entered passive state\n"); |
|
work_done += ifi_canfd_handle_state_change(ndev, |
|
CAN_STATE_ERROR_PASSIVE); |
|
} |
|
|
|
if ((stcmd & IFI_CANFD_STCMD_BUSOFF) && |
|
(priv->can.state != CAN_STATE_BUS_OFF)) { |
|
netdev_dbg(ndev, "Error, entered bus-off state\n"); |
|
work_done += ifi_canfd_handle_state_change(ndev, |
|
CAN_STATE_BUS_OFF); |
|
} |
|
|
|
return work_done; |
|
} |
|
|
|
static int ifi_canfd_poll(struct napi_struct *napi, int quota) |
|
{ |
|
struct net_device *ndev = napi->dev; |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
u32 rxstcmd = readl(priv->base + IFI_CANFD_RXSTCMD); |
|
int work_done = 0; |
|
|
|
/* Handle bus state changes */ |
|
work_done += ifi_canfd_handle_state_errors(ndev); |
|
|
|
/* Handle lost messages on RX */ |
|
if (rxstcmd & IFI_CANFD_RXSTCMD_OVERFLOW) |
|
work_done += ifi_canfd_handle_lost_msg(ndev); |
|
|
|
/* Handle lec errors on the bus */ |
|
if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) |
|
work_done += ifi_canfd_handle_lec_err(ndev); |
|
|
|
/* Handle normal messages on RX */ |
|
if (!(rxstcmd & IFI_CANFD_RXSTCMD_EMPTY)) |
|
work_done += ifi_canfd_do_rx_poll(ndev, quota - work_done); |
|
|
|
if (work_done < quota) { |
|
napi_complete_done(napi, work_done); |
|
ifi_canfd_irq_enable(ndev, 1); |
|
} |
|
|
|
return work_done; |
|
} |
|
|
|
static irqreturn_t ifi_canfd_isr(int irq, void *dev_id) |
|
{ |
|
struct net_device *ndev = (struct net_device *)dev_id; |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
struct net_device_stats *stats = &ndev->stats; |
|
const u32 rx_irq_mask = IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY | |
|
IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER | |
|
IFI_CANFD_INTERRUPT_ERROR_COUNTER | |
|
IFI_CANFD_INTERRUPT_ERROR_STATE_CHG | |
|
IFI_CANFD_INTERRUPT_ERROR_WARNING | |
|
IFI_CANFD_INTERRUPT_ERROR_BUSOFF; |
|
const u32 tx_irq_mask = IFI_CANFD_INTERRUPT_TXFIFO_EMPTY | |
|
IFI_CANFD_INTERRUPT_TXFIFO_REMOVE; |
|
const u32 clr_irq_mask = ~((u32)IFI_CANFD_INTERRUPT_SET_IRQ); |
|
u32 isr; |
|
|
|
isr = readl(priv->base + IFI_CANFD_INTERRUPT); |
|
|
|
/* No interrupt */ |
|
if (isr == 0) |
|
return IRQ_NONE; |
|
|
|
/* Clear all pending interrupts but ErrWarn */ |
|
writel(clr_irq_mask, priv->base + IFI_CANFD_INTERRUPT); |
|
|
|
/* RX IRQ or bus warning, start NAPI */ |
|
if (isr & rx_irq_mask) { |
|
ifi_canfd_irq_enable(ndev, 0); |
|
napi_schedule(&priv->napi); |
|
} |
|
|
|
/* TX IRQ */ |
|
if (isr & IFI_CANFD_INTERRUPT_TXFIFO_REMOVE) { |
|
stats->tx_bytes += can_get_echo_skb(ndev, 0, NULL); |
|
stats->tx_packets++; |
|
can_led_event(ndev, CAN_LED_EVENT_TX); |
|
} |
|
|
|
if (isr & tx_irq_mask) |
|
netif_wake_queue(ndev); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static const struct can_bittiming_const ifi_canfd_bittiming_const = { |
|
.name = KBUILD_MODNAME, |
|
.tseg1_min = 1, /* Time segment 1 = prop_seg + phase_seg1 */ |
|
.tseg1_max = 256, |
|
.tseg2_min = 2, /* Time segment 2 = phase_seg2 */ |
|
.tseg2_max = 256, |
|
.sjw_max = 128, |
|
.brp_min = 2, |
|
.brp_max = 512, |
|
.brp_inc = 1, |
|
}; |
|
|
|
static void ifi_canfd_set_bittiming(struct net_device *ndev) |
|
{ |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
const struct can_bittiming *bt = &priv->can.bittiming; |
|
const struct can_bittiming *dbt = &priv->can.data_bittiming; |
|
u16 brp, sjw, tseg1, tseg2, tdc; |
|
|
|
/* Configure bit timing */ |
|
brp = bt->brp - 2; |
|
sjw = bt->sjw - 1; |
|
tseg1 = bt->prop_seg + bt->phase_seg1 - 1; |
|
tseg2 = bt->phase_seg2 - 2; |
|
writel((tseg2 << IFI_CANFD_TIME_TIMEB_OFF) | |
|
(tseg1 << IFI_CANFD_TIME_TIMEA_OFF) | |
|
(brp << IFI_CANFD_TIME_PRESCALE_OFF) | |
|
(sjw << IFI_CANFD_TIME_SJW_OFF_7_9_8_8), |
|
priv->base + IFI_CANFD_TIME); |
|
|
|
/* Configure data bit timing */ |
|
brp = dbt->brp - 2; |
|
sjw = dbt->sjw - 1; |
|
tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1; |
|
tseg2 = dbt->phase_seg2 - 2; |
|
writel((tseg2 << IFI_CANFD_TIME_TIMEB_OFF) | |
|
(tseg1 << IFI_CANFD_TIME_TIMEA_OFF) | |
|
(brp << IFI_CANFD_TIME_PRESCALE_OFF) | |
|
(sjw << IFI_CANFD_TIME_SJW_OFF_7_9_8_8), |
|
priv->base + IFI_CANFD_FTIME); |
|
|
|
/* Configure transmitter delay */ |
|
tdc = dbt->brp * (dbt->prop_seg + dbt->phase_seg1); |
|
tdc &= IFI_CANFD_TDELAY_MASK; |
|
writel(IFI_CANFD_TDELAY_EN | tdc, priv->base + IFI_CANFD_TDELAY); |
|
} |
|
|
|
static void ifi_canfd_set_filter(struct net_device *ndev, const u32 id, |
|
const u32 mask, const u32 ident) |
|
{ |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
|
|
writel(mask, priv->base + IFI_CANFD_FILTER_MASK(id)); |
|
writel(ident, priv->base + IFI_CANFD_FILTER_IDENT(id)); |
|
} |
|
|
|
static void ifi_canfd_set_filters(struct net_device *ndev) |
|
{ |
|
/* Receive all CAN frames (standard ID) */ |
|
ifi_canfd_set_filter(ndev, 0, |
|
IFI_CANFD_FILTER_MASK_VALID | |
|
IFI_CANFD_FILTER_MASK_EXT, |
|
IFI_CANFD_FILTER_IDENT_VALID); |
|
|
|
/* Receive all CAN frames (extended ID) */ |
|
ifi_canfd_set_filter(ndev, 1, |
|
IFI_CANFD_FILTER_MASK_VALID | |
|
IFI_CANFD_FILTER_MASK_EXT, |
|
IFI_CANFD_FILTER_IDENT_VALID | |
|
IFI_CANFD_FILTER_IDENT_IDE); |
|
|
|
/* Receive all CANFD frames */ |
|
ifi_canfd_set_filter(ndev, 2, |
|
IFI_CANFD_FILTER_MASK_VALID | |
|
IFI_CANFD_FILTER_MASK_EDL | |
|
IFI_CANFD_FILTER_MASK_EXT, |
|
IFI_CANFD_FILTER_IDENT_VALID | |
|
IFI_CANFD_FILTER_IDENT_CANFD | |
|
IFI_CANFD_FILTER_IDENT_IDE); |
|
} |
|
|
|
static void ifi_canfd_start(struct net_device *ndev) |
|
{ |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
u32 stcmd; |
|
|
|
/* Reset the IP */ |
|
writel(IFI_CANFD_STCMD_HARDRESET, priv->base + IFI_CANFD_STCMD); |
|
writel(IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING, |
|
priv->base + IFI_CANFD_STCMD); |
|
|
|
ifi_canfd_set_bittiming(ndev); |
|
ifi_canfd_set_filters(ndev); |
|
|
|
/* Reset FIFOs */ |
|
writel(IFI_CANFD_RXSTCMD_RESET, priv->base + IFI_CANFD_RXSTCMD); |
|
writel(0, priv->base + IFI_CANFD_RXSTCMD); |
|
writel(IFI_CANFD_TXSTCMD_RESET, priv->base + IFI_CANFD_TXSTCMD); |
|
writel(0, priv->base + IFI_CANFD_TXSTCMD); |
|
|
|
/* Repeat transmission until successful */ |
|
writel(0, priv->base + IFI_CANFD_REPEAT); |
|
writel(0, priv->base + IFI_CANFD_SUSPEND); |
|
|
|
/* Clear all pending interrupts */ |
|
writel((u32)(~IFI_CANFD_INTERRUPT_SET_IRQ), |
|
priv->base + IFI_CANFD_INTERRUPT); |
|
|
|
stcmd = IFI_CANFD_STCMD_ENABLE | IFI_CANFD_STCMD_NORMAL_MODE | |
|
IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING; |
|
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) |
|
stcmd |= IFI_CANFD_STCMD_BUSMONITOR; |
|
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) |
|
stcmd |= IFI_CANFD_STCMD_LOOPBACK; |
|
|
|
if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) && |
|
!(priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)) |
|
stcmd |= IFI_CANFD_STCMD_ENABLE_ISO; |
|
|
|
if (!(priv->can.ctrlmode & CAN_CTRLMODE_FD)) |
|
stcmd |= IFI_CANFD_STCMD_DISABLE_CANFD; |
|
|
|
priv->can.state = CAN_STATE_ERROR_ACTIVE; |
|
|
|
ifi_canfd_irq_enable(ndev, 1); |
|
|
|
/* Unlock, reset and enable the error counter. */ |
|
writel(IFI_CANFD_ERROR_CTR_UNLOCK_MAGIC, |
|
priv->base + IFI_CANFD_ERROR_CTR); |
|
writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR); |
|
writel(IFI_CANFD_ERROR_CTR_ER_ENABLE, priv->base + IFI_CANFD_ERROR_CTR); |
|
|
|
/* Enable controller */ |
|
writel(stcmd, priv->base + IFI_CANFD_STCMD); |
|
} |
|
|
|
static void ifi_canfd_stop(struct net_device *ndev) |
|
{ |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
|
|
/* Reset and disable the error counter. */ |
|
writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR); |
|
writel(0, priv->base + IFI_CANFD_ERROR_CTR); |
|
|
|
/* Reset the IP */ |
|
writel(IFI_CANFD_STCMD_HARDRESET, priv->base + IFI_CANFD_STCMD); |
|
|
|
/* Mask all interrupts */ |
|
writel(~0, priv->base + IFI_CANFD_IRQMASK); |
|
|
|
/* Clear all pending interrupts */ |
|
writel((u32)(~IFI_CANFD_INTERRUPT_SET_IRQ), |
|
priv->base + IFI_CANFD_INTERRUPT); |
|
|
|
/* Set the state as STOPPED */ |
|
priv->can.state = CAN_STATE_STOPPED; |
|
} |
|
|
|
static int ifi_canfd_set_mode(struct net_device *ndev, enum can_mode mode) |
|
{ |
|
switch (mode) { |
|
case CAN_MODE_START: |
|
ifi_canfd_start(ndev); |
|
netif_wake_queue(ndev); |
|
break; |
|
default: |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int ifi_canfd_open(struct net_device *ndev) |
|
{ |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
int ret; |
|
|
|
ret = open_candev(ndev); |
|
if (ret) { |
|
netdev_err(ndev, "Failed to open CAN device\n"); |
|
return ret; |
|
} |
|
|
|
/* Register interrupt handler */ |
|
ret = request_irq(ndev->irq, ifi_canfd_isr, IRQF_SHARED, |
|
ndev->name, ndev); |
|
if (ret < 0) { |
|
netdev_err(ndev, "Failed to request interrupt\n"); |
|
goto err_irq; |
|
} |
|
|
|
ifi_canfd_start(ndev); |
|
|
|
can_led_event(ndev, CAN_LED_EVENT_OPEN); |
|
napi_enable(&priv->napi); |
|
netif_start_queue(ndev); |
|
|
|
return 0; |
|
err_irq: |
|
close_candev(ndev); |
|
return ret; |
|
} |
|
|
|
static int ifi_canfd_close(struct net_device *ndev) |
|
{ |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
|
|
netif_stop_queue(ndev); |
|
napi_disable(&priv->napi); |
|
|
|
ifi_canfd_stop(ndev); |
|
|
|
free_irq(ndev->irq, ndev); |
|
|
|
close_candev(ndev); |
|
|
|
can_led_event(ndev, CAN_LED_EVENT_STOP); |
|
|
|
return 0; |
|
} |
|
|
|
static netdev_tx_t ifi_canfd_start_xmit(struct sk_buff *skb, |
|
struct net_device *ndev) |
|
{ |
|
struct ifi_canfd_priv *priv = netdev_priv(ndev); |
|
struct canfd_frame *cf = (struct canfd_frame *)skb->data; |
|
u32 txst, txid, txdlc; |
|
int i; |
|
|
|
if (can_dropped_invalid_skb(ndev, skb)) |
|
return NETDEV_TX_OK; |
|
|
|
/* Check if the TX buffer is full */ |
|
txst = readl(priv->base + IFI_CANFD_TXSTCMD); |
|
if (txst & IFI_CANFD_TXSTCMD_FULL) { |
|
netif_stop_queue(ndev); |
|
netdev_err(ndev, "BUG! TX FIFO full when queue awake!\n"); |
|
return NETDEV_TX_BUSY; |
|
} |
|
|
|
netif_stop_queue(ndev); |
|
|
|
if (cf->can_id & CAN_EFF_FLAG) { |
|
txid = cf->can_id & CAN_EFF_MASK; |
|
/* |
|
* In case the Extended ID frame is transmitted, the |
|
* standard and extended part of the ID are swapped |
|
* in the register, so swap them back to send the |
|
* correct ID. |
|
*/ |
|
txid = (txid >> IFI_CANFD_TXFIFO_ID_ID_XTD_WIDTH) | |
|
((txid & IFI_CANFD_TXFIFO_ID_ID_XTD_MASK) << |
|
IFI_CANFD_TXFIFO_ID_ID_XTD_OFFSET); |
|
txid |= IFI_CANFD_TXFIFO_ID_IDE; |
|
} else { |
|
txid = cf->can_id & CAN_SFF_MASK; |
|
} |
|
|
|
txdlc = can_fd_len2dlc(cf->len); |
|
if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) && can_is_canfd_skb(skb)) { |
|
txdlc |= IFI_CANFD_TXFIFO_DLC_EDL; |
|
if (cf->flags & CANFD_BRS) |
|
txdlc |= IFI_CANFD_TXFIFO_DLC_BRS; |
|
} |
|
|
|
if (cf->can_id & CAN_RTR_FLAG) |
|
txdlc |= IFI_CANFD_TXFIFO_DLC_RTR; |
|
|
|
/* message ram configuration */ |
|
writel(txid, priv->base + IFI_CANFD_TXFIFO_ID); |
|
writel(txdlc, priv->base + IFI_CANFD_TXFIFO_DLC); |
|
|
|
for (i = 0; i < cf->len; i += 4) { |
|
writel(*(u32 *)(cf->data + i), |
|
priv->base + IFI_CANFD_TXFIFO_DATA + i); |
|
} |
|
|
|
writel(0, priv->base + IFI_CANFD_TXFIFO_REPEATCOUNT); |
|
writel(0, priv->base + IFI_CANFD_TXFIFO_SUSPEND_US); |
|
|
|
can_put_echo_skb(skb, ndev, 0, 0); |
|
|
|
/* Start the transmission */ |
|
writel(IFI_CANFD_TXSTCMD_ADD_MSG, priv->base + IFI_CANFD_TXSTCMD); |
|
|
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static const struct net_device_ops ifi_canfd_netdev_ops = { |
|
.ndo_open = ifi_canfd_open, |
|
.ndo_stop = ifi_canfd_close, |
|
.ndo_start_xmit = ifi_canfd_start_xmit, |
|
.ndo_change_mtu = can_change_mtu, |
|
}; |
|
|
|
static int ifi_canfd_plat_probe(struct platform_device *pdev) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
struct net_device *ndev; |
|
struct ifi_canfd_priv *priv; |
|
void __iomem *addr; |
|
int irq, ret; |
|
u32 id, rev; |
|
|
|
addr = devm_platform_ioremap_resource(pdev, 0); |
|
if (IS_ERR(addr)) |
|
return PTR_ERR(addr); |
|
|
|
irq = platform_get_irq(pdev, 0); |
|
if (irq < 0) |
|
return -EINVAL; |
|
|
|
id = readl(addr + IFI_CANFD_IP_ID); |
|
if (id != IFI_CANFD_IP_ID_VALUE) { |
|
dev_err(dev, "This block is not IFI CANFD, id=%08x\n", id); |
|
return -EINVAL; |
|
} |
|
|
|
rev = readl(addr + IFI_CANFD_VER) & IFI_CANFD_VER_REV_MASK; |
|
if (rev < IFI_CANFD_VER_REV_MIN_SUPPORTED) { |
|
dev_err(dev, "This block is too old (rev %i), minimum supported is rev %i\n", |
|
rev, IFI_CANFD_VER_REV_MIN_SUPPORTED); |
|
return -EINVAL; |
|
} |
|
|
|
ndev = alloc_candev(sizeof(*priv), 1); |
|
if (!ndev) |
|
return -ENOMEM; |
|
|
|
ndev->irq = irq; |
|
ndev->flags |= IFF_ECHO; /* we support local echo */ |
|
ndev->netdev_ops = &ifi_canfd_netdev_ops; |
|
|
|
priv = netdev_priv(ndev); |
|
priv->ndev = ndev; |
|
priv->base = addr; |
|
|
|
netif_napi_add(ndev, &priv->napi, ifi_canfd_poll, 64); |
|
|
|
priv->can.state = CAN_STATE_STOPPED; |
|
|
|
priv->can.clock.freq = readl(addr + IFI_CANFD_CANCLOCK); |
|
|
|
priv->can.bittiming_const = &ifi_canfd_bittiming_const; |
|
priv->can.data_bittiming_const = &ifi_canfd_bittiming_const; |
|
priv->can.do_set_mode = ifi_canfd_set_mode; |
|
priv->can.do_get_berr_counter = ifi_canfd_get_berr_counter; |
|
|
|
/* IFI CANFD can do both Bosch FD and ISO FD */ |
|
priv->can.ctrlmode = CAN_CTRLMODE_FD; |
|
|
|
/* IFI CANFD can do both Bosch FD and ISO FD */ |
|
priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | |
|
CAN_CTRLMODE_LISTENONLY | |
|
CAN_CTRLMODE_FD | |
|
CAN_CTRLMODE_FD_NON_ISO | |
|
CAN_CTRLMODE_BERR_REPORTING; |
|
|
|
platform_set_drvdata(pdev, ndev); |
|
SET_NETDEV_DEV(ndev, dev); |
|
|
|
ret = register_candev(ndev); |
|
if (ret) { |
|
dev_err(dev, "Failed to register (ret=%d)\n", ret); |
|
goto err_reg; |
|
} |
|
|
|
devm_can_led_init(ndev); |
|
|
|
dev_info(dev, "Driver registered: regs=%p, irq=%d, clock=%d\n", |
|
priv->base, ndev->irq, priv->can.clock.freq); |
|
|
|
return 0; |
|
|
|
err_reg: |
|
free_candev(ndev); |
|
return ret; |
|
} |
|
|
|
static int ifi_canfd_plat_remove(struct platform_device *pdev) |
|
{ |
|
struct net_device *ndev = platform_get_drvdata(pdev); |
|
|
|
unregister_candev(ndev); |
|
platform_set_drvdata(pdev, NULL); |
|
free_candev(ndev); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct of_device_id ifi_canfd_of_table[] = { |
|
{ .compatible = "ifi,canfd-1.0", .data = NULL }, |
|
{ /* sentinel */ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, ifi_canfd_of_table); |
|
|
|
static struct platform_driver ifi_canfd_plat_driver = { |
|
.driver = { |
|
.name = KBUILD_MODNAME, |
|
.of_match_table = ifi_canfd_of_table, |
|
}, |
|
.probe = ifi_canfd_plat_probe, |
|
.remove = ifi_canfd_plat_remove, |
|
}; |
|
|
|
module_platform_driver(ifi_canfd_plat_driver); |
|
|
|
MODULE_AUTHOR("Marek Vasut <[email protected]>"); |
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_DESCRIPTION("CAN bus driver for IFI CANFD controller");
|
|
|