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![Angelo Dureghello](/assets/img/avatar_default.png)
For cases when flexcan is built-in, bitrate is still not set at
registering. So flexcan_chip_freeze() generates:
[ 1.860000] *** ZERO DIVIDE *** FORMAT=4
[ 1.860000] Current process id is 1
[ 1.860000] BAD KERNEL TRAP: 00000000
[ 1.860000] PC: [<402e70c8>] flexcan_chip_freeze+0x1a/0xa8
To allow chip freeze, using an hardcoded timeout when bitrate is still
not set.
Fixes: ec15e27cc8
("can: flexcan: enable RX FIFO after FRZ/HALT valid")
Link: https://lore.kernel.org/r/20210315231510.650593-1-angelo@kernel-space.org
Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
[mkl: use if instead of ? operator]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2332 lines
64 KiB
C
2332 lines
64 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// flexcan.c - FLEXCAN CAN controller driver
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//
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// Copyright (c) 2005-2006 Varma Electronics Oy
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// Copyright (c) 2009 Sascha Hauer, Pengutronix
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// Copyright (c) 2010-2017 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de>
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// Copyright (c) 2014 David Jander, Protonic Holland
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//
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// Based on code originally by Andrey Volkov <avolkov@varma-el.com>
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#include <dt-bindings/firmware/imx/rsrc.h>
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#include <linux/bitfield.h>
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#include <linux/can.h>
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#include <linux/can/dev.h>
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#include <linux/can/error.h>
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#include <linux/can/led.h>
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#include <linux/can/rx-offload.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/firmware/imx/sci.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/mfd/syscon.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/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#define DRV_NAME "flexcan"
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/* 8 for RX fifo and 2 error handling */
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#define FLEXCAN_NAPI_WEIGHT (8 + 2)
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/* FLEXCAN module configuration register (CANMCR) bits */
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#define FLEXCAN_MCR_MDIS BIT(31)
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#define FLEXCAN_MCR_FRZ BIT(30)
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#define FLEXCAN_MCR_FEN BIT(29)
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#define FLEXCAN_MCR_HALT BIT(28)
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#define FLEXCAN_MCR_NOT_RDY BIT(27)
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#define FLEXCAN_MCR_WAK_MSK BIT(26)
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#define FLEXCAN_MCR_SOFTRST BIT(25)
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#define FLEXCAN_MCR_FRZ_ACK BIT(24)
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#define FLEXCAN_MCR_SUPV BIT(23)
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#define FLEXCAN_MCR_SLF_WAK BIT(22)
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#define FLEXCAN_MCR_WRN_EN BIT(21)
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#define FLEXCAN_MCR_LPM_ACK BIT(20)
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#define FLEXCAN_MCR_WAK_SRC BIT(19)
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#define FLEXCAN_MCR_DOZE BIT(18)
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#define FLEXCAN_MCR_SRX_DIS BIT(17)
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#define FLEXCAN_MCR_IRMQ BIT(16)
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#define FLEXCAN_MCR_LPRIO_EN BIT(13)
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#define FLEXCAN_MCR_AEN BIT(12)
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#define FLEXCAN_MCR_FDEN BIT(11)
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/* MCR_MAXMB: maximum used MBs is MAXMB + 1 */
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#define FLEXCAN_MCR_MAXMB(x) ((x) & 0x7f)
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#define FLEXCAN_MCR_IDAM_A (0x0 << 8)
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#define FLEXCAN_MCR_IDAM_B (0x1 << 8)
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#define FLEXCAN_MCR_IDAM_C (0x2 << 8)
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#define FLEXCAN_MCR_IDAM_D (0x3 << 8)
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/* FLEXCAN control register (CANCTRL) bits */
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#define FLEXCAN_CTRL_PRESDIV(x) (((x) & 0xff) << 24)
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#define FLEXCAN_CTRL_RJW(x) (((x) & 0x03) << 22)
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#define FLEXCAN_CTRL_PSEG1(x) (((x) & 0x07) << 19)
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#define FLEXCAN_CTRL_PSEG2(x) (((x) & 0x07) << 16)
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#define FLEXCAN_CTRL_BOFF_MSK BIT(15)
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#define FLEXCAN_CTRL_ERR_MSK BIT(14)
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#define FLEXCAN_CTRL_CLK_SRC BIT(13)
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#define FLEXCAN_CTRL_LPB BIT(12)
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#define FLEXCAN_CTRL_TWRN_MSK BIT(11)
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#define FLEXCAN_CTRL_RWRN_MSK BIT(10)
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#define FLEXCAN_CTRL_SMP BIT(7)
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#define FLEXCAN_CTRL_BOFF_REC BIT(6)
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#define FLEXCAN_CTRL_TSYN BIT(5)
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#define FLEXCAN_CTRL_LBUF BIT(4)
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#define FLEXCAN_CTRL_LOM BIT(3)
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#define FLEXCAN_CTRL_PROPSEG(x) ((x) & 0x07)
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#define FLEXCAN_CTRL_ERR_BUS (FLEXCAN_CTRL_ERR_MSK)
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#define FLEXCAN_CTRL_ERR_STATE \
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(FLEXCAN_CTRL_TWRN_MSK | FLEXCAN_CTRL_RWRN_MSK | \
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FLEXCAN_CTRL_BOFF_MSK)
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#define FLEXCAN_CTRL_ERR_ALL \
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(FLEXCAN_CTRL_ERR_BUS | FLEXCAN_CTRL_ERR_STATE)
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/* FLEXCAN control register 2 (CTRL2) bits */
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#define FLEXCAN_CTRL2_ECRWRE BIT(29)
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#define FLEXCAN_CTRL2_WRMFRZ BIT(28)
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#define FLEXCAN_CTRL2_RFFN(x) (((x) & 0x0f) << 24)
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#define FLEXCAN_CTRL2_TASD(x) (((x) & 0x1f) << 19)
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#define FLEXCAN_CTRL2_MRP BIT(18)
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#define FLEXCAN_CTRL2_RRS BIT(17)
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#define FLEXCAN_CTRL2_EACEN BIT(16)
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#define FLEXCAN_CTRL2_ISOCANFDEN BIT(12)
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/* FLEXCAN memory error control register (MECR) bits */
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#define FLEXCAN_MECR_ECRWRDIS BIT(31)
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#define FLEXCAN_MECR_HANCEI_MSK BIT(19)
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#define FLEXCAN_MECR_FANCEI_MSK BIT(18)
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#define FLEXCAN_MECR_CEI_MSK BIT(16)
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#define FLEXCAN_MECR_HAERRIE BIT(15)
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#define FLEXCAN_MECR_FAERRIE BIT(14)
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#define FLEXCAN_MECR_EXTERRIE BIT(13)
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#define FLEXCAN_MECR_RERRDIS BIT(9)
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#define FLEXCAN_MECR_ECCDIS BIT(8)
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#define FLEXCAN_MECR_NCEFAFRZ BIT(7)
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/* FLEXCAN error and status register (ESR) bits */
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#define FLEXCAN_ESR_TWRN_INT BIT(17)
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#define FLEXCAN_ESR_RWRN_INT BIT(16)
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#define FLEXCAN_ESR_BIT1_ERR BIT(15)
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#define FLEXCAN_ESR_BIT0_ERR BIT(14)
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#define FLEXCAN_ESR_ACK_ERR BIT(13)
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#define FLEXCAN_ESR_CRC_ERR BIT(12)
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#define FLEXCAN_ESR_FRM_ERR BIT(11)
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#define FLEXCAN_ESR_STF_ERR BIT(10)
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#define FLEXCAN_ESR_TX_WRN BIT(9)
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#define FLEXCAN_ESR_RX_WRN BIT(8)
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#define FLEXCAN_ESR_IDLE BIT(7)
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#define FLEXCAN_ESR_TXRX BIT(6)
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#define FLEXCAN_EST_FLT_CONF_SHIFT (4)
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#define FLEXCAN_ESR_FLT_CONF_MASK (0x3 << FLEXCAN_EST_FLT_CONF_SHIFT)
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#define FLEXCAN_ESR_FLT_CONF_ACTIVE (0x0 << FLEXCAN_EST_FLT_CONF_SHIFT)
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#define FLEXCAN_ESR_FLT_CONF_PASSIVE (0x1 << FLEXCAN_EST_FLT_CONF_SHIFT)
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#define FLEXCAN_ESR_BOFF_INT BIT(2)
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#define FLEXCAN_ESR_ERR_INT BIT(1)
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#define FLEXCAN_ESR_WAK_INT BIT(0)
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#define FLEXCAN_ESR_ERR_BUS \
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(FLEXCAN_ESR_BIT1_ERR | FLEXCAN_ESR_BIT0_ERR | \
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FLEXCAN_ESR_ACK_ERR | FLEXCAN_ESR_CRC_ERR | \
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FLEXCAN_ESR_FRM_ERR | FLEXCAN_ESR_STF_ERR)
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#define FLEXCAN_ESR_ERR_STATE \
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(FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | FLEXCAN_ESR_BOFF_INT)
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#define FLEXCAN_ESR_ERR_ALL \
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(FLEXCAN_ESR_ERR_BUS | FLEXCAN_ESR_ERR_STATE)
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#define FLEXCAN_ESR_ALL_INT \
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(FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | \
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FLEXCAN_ESR_BOFF_INT | FLEXCAN_ESR_ERR_INT)
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/* FLEXCAN Bit Timing register (CBT) bits */
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#define FLEXCAN_CBT_BTF BIT(31)
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#define FLEXCAN_CBT_EPRESDIV_MASK GENMASK(30, 21)
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#define FLEXCAN_CBT_ERJW_MASK GENMASK(20, 16)
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#define FLEXCAN_CBT_EPROPSEG_MASK GENMASK(15, 10)
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#define FLEXCAN_CBT_EPSEG1_MASK GENMASK(9, 5)
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#define FLEXCAN_CBT_EPSEG2_MASK GENMASK(4, 0)
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/* FLEXCAN FD control register (FDCTRL) bits */
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#define FLEXCAN_FDCTRL_FDRATE BIT(31)
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#define FLEXCAN_FDCTRL_MBDSR1 GENMASK(20, 19)
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#define FLEXCAN_FDCTRL_MBDSR0 GENMASK(17, 16)
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#define FLEXCAN_FDCTRL_MBDSR_8 0x0
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#define FLEXCAN_FDCTRL_MBDSR_12 0x1
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#define FLEXCAN_FDCTRL_MBDSR_32 0x2
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#define FLEXCAN_FDCTRL_MBDSR_64 0x3
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#define FLEXCAN_FDCTRL_TDCEN BIT(15)
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#define FLEXCAN_FDCTRL_TDCFAIL BIT(14)
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#define FLEXCAN_FDCTRL_TDCOFF GENMASK(12, 8)
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#define FLEXCAN_FDCTRL_TDCVAL GENMASK(5, 0)
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/* FLEXCAN FD Bit Timing register (FDCBT) bits */
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#define FLEXCAN_FDCBT_FPRESDIV_MASK GENMASK(29, 20)
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#define FLEXCAN_FDCBT_FRJW_MASK GENMASK(18, 16)
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#define FLEXCAN_FDCBT_FPROPSEG_MASK GENMASK(14, 10)
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#define FLEXCAN_FDCBT_FPSEG1_MASK GENMASK(7, 5)
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#define FLEXCAN_FDCBT_FPSEG2_MASK GENMASK(2, 0)
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/* FLEXCAN interrupt flag register (IFLAG) bits */
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/* Errata ERR005829 step7: Reserve first valid MB */
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#define FLEXCAN_TX_MB_RESERVED_OFF_FIFO 8
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#define FLEXCAN_TX_MB_RESERVED_OFF_TIMESTAMP 0
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#define FLEXCAN_RX_MB_OFF_TIMESTAMP_FIRST (FLEXCAN_TX_MB_RESERVED_OFF_TIMESTAMP + 1)
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#define FLEXCAN_IFLAG_MB(x) BIT_ULL(x)
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#define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7)
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#define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6)
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#define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE BIT(5)
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/* FLEXCAN message buffers */
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#define FLEXCAN_MB_CODE_MASK (0xf << 24)
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#define FLEXCAN_MB_CODE_RX_BUSY_BIT (0x1 << 24)
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#define FLEXCAN_MB_CODE_RX_INACTIVE (0x0 << 24)
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#define FLEXCAN_MB_CODE_RX_EMPTY (0x4 << 24)
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#define FLEXCAN_MB_CODE_RX_FULL (0x2 << 24)
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#define FLEXCAN_MB_CODE_RX_OVERRUN (0x6 << 24)
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#define FLEXCAN_MB_CODE_RX_RANSWER (0xa << 24)
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#define FLEXCAN_MB_CODE_TX_INACTIVE (0x8 << 24)
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#define FLEXCAN_MB_CODE_TX_ABORT (0x9 << 24)
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#define FLEXCAN_MB_CODE_TX_DATA (0xc << 24)
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#define FLEXCAN_MB_CODE_TX_TANSWER (0xe << 24)
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#define FLEXCAN_MB_CNT_EDL BIT(31)
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#define FLEXCAN_MB_CNT_BRS BIT(30)
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#define FLEXCAN_MB_CNT_ESI BIT(29)
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#define FLEXCAN_MB_CNT_SRR BIT(22)
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#define FLEXCAN_MB_CNT_IDE BIT(21)
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#define FLEXCAN_MB_CNT_RTR BIT(20)
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#define FLEXCAN_MB_CNT_LENGTH(x) (((x) & 0xf) << 16)
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#define FLEXCAN_MB_CNT_TIMESTAMP(x) ((x) & 0xffff)
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#define FLEXCAN_TIMEOUT_US (250)
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/* FLEXCAN hardware feature flags
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*
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* Below is some version info we got:
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* SOC Version IP-Version Glitch- [TR]WRN_INT IRQ Err Memory err RTR rece- FD Mode
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* Filter? connected? Passive detection ption in MB Supported?
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* MX25 FlexCAN2 03.00.00.00 no no no no no no
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* MX28 FlexCAN2 03.00.04.00 yes yes no no no no
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* MX35 FlexCAN2 03.00.00.00 no no no no no no
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* MX53 FlexCAN2 03.00.00.00 yes no no no no no
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* MX6s FlexCAN3 10.00.12.00 yes yes no no yes no
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* MX8QM FlexCAN3 03.00.23.00 yes yes no no yes yes
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* MX8MP FlexCAN3 03.00.17.01 yes yes no yes yes yes
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* VF610 FlexCAN3 ? no yes no yes yes? no
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* LS1021A FlexCAN2 03.00.04.00 no yes no no yes no
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* LX2160A FlexCAN3 03.00.23.00 no yes no yes yes yes
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*
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* Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected.
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*/
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/* [TR]WRN_INT not connected */
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#define FLEXCAN_QUIRK_BROKEN_WERR_STATE BIT(1)
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/* Disable RX FIFO Global mask */
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#define FLEXCAN_QUIRK_DISABLE_RXFG BIT(2)
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/* Enable EACEN and RRS bit in ctrl2 */
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#define FLEXCAN_QUIRK_ENABLE_EACEN_RRS BIT(3)
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/* Disable non-correctable errors interrupt and freeze mode */
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#define FLEXCAN_QUIRK_DISABLE_MECR BIT(4)
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/* Use timestamp based offloading */
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#define FLEXCAN_QUIRK_USE_OFF_TIMESTAMP BIT(5)
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/* No interrupt for error passive */
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#define FLEXCAN_QUIRK_BROKEN_PERR_STATE BIT(6)
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/* default to BE register access */
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#define FLEXCAN_QUIRK_DEFAULT_BIG_ENDIAN BIT(7)
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/* Setup stop mode with GPR to support wakeup */
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#define FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR BIT(8)
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/* Support CAN-FD mode */
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#define FLEXCAN_QUIRK_SUPPORT_FD BIT(9)
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/* support memory detection and correction */
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#define FLEXCAN_QUIRK_SUPPORT_ECC BIT(10)
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/* Setup stop mode with SCU firmware to support wakeup */
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#define FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW BIT(11)
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/* Structure of the message buffer */
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struct flexcan_mb {
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u32 can_ctrl;
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u32 can_id;
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u32 data[];
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};
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/* Structure of the hardware registers */
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struct flexcan_regs {
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u32 mcr; /* 0x00 */
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u32 ctrl; /* 0x04 - Not affected by Soft Reset */
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u32 timer; /* 0x08 */
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u32 tcr; /* 0x0c */
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u32 rxgmask; /* 0x10 - Not affected by Soft Reset */
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u32 rx14mask; /* 0x14 - Not affected by Soft Reset */
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u32 rx15mask; /* 0x18 - Not affected by Soft Reset */
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u32 ecr; /* 0x1c */
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u32 esr; /* 0x20 */
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u32 imask2; /* 0x24 */
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u32 imask1; /* 0x28 */
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u32 iflag2; /* 0x2c */
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u32 iflag1; /* 0x30 */
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union { /* 0x34 */
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u32 gfwr_mx28; /* MX28, MX53 */
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u32 ctrl2; /* MX6, VF610 - Not affected by Soft Reset */
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};
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u32 esr2; /* 0x38 */
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u32 imeur; /* 0x3c */
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u32 lrfr; /* 0x40 */
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u32 crcr; /* 0x44 */
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u32 rxfgmask; /* 0x48 */
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u32 rxfir; /* 0x4c - Not affected by Soft Reset */
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u32 cbt; /* 0x50 - Not affected by Soft Reset */
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u32 _reserved2; /* 0x54 */
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u32 dbg1; /* 0x58 */
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u32 dbg2; /* 0x5c */
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u32 _reserved3[8]; /* 0x60 */
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u8 mb[2][512]; /* 0x80 - Not affected by Soft Reset */
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/* FIFO-mode:
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* MB
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* 0x080...0x08f 0 RX message buffer
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* 0x090...0x0df 1-5 reserved
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* 0x0e0...0x0ff 6-7 8 entry ID table
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* (mx25, mx28, mx35, mx53)
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* 0x0e0...0x2df 6-7..37 8..128 entry ID table
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* size conf'ed via ctrl2::RFFN
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* (mx6, vf610)
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*/
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u32 _reserved4[256]; /* 0x480 */
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u32 rximr[64]; /* 0x880 - Not affected by Soft Reset */
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u32 _reserved5[24]; /* 0x980 */
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u32 gfwr_mx6; /* 0x9e0 - MX6 */
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u32 _reserved6[39]; /* 0x9e4 */
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u32 _rxfir[6]; /* 0xa80 */
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u32 _reserved8[2]; /* 0xa98 */
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u32 _rxmgmask; /* 0xaa0 */
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u32 _rxfgmask; /* 0xaa4 */
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u32 _rx14mask; /* 0xaa8 */
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u32 _rx15mask; /* 0xaac */
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u32 tx_smb[4]; /* 0xab0 */
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u32 rx_smb0[4]; /* 0xac0 */
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u32 rx_smb1[4]; /* 0xad0 */
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u32 mecr; /* 0xae0 */
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u32 erriar; /* 0xae4 */
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u32 erridpr; /* 0xae8 */
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u32 errippr; /* 0xaec */
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u32 rerrar; /* 0xaf0 */
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u32 rerrdr; /* 0xaf4 */
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u32 rerrsynr; /* 0xaf8 */
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u32 errsr; /* 0xafc */
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u32 _reserved7[64]; /* 0xb00 */
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u32 fdctrl; /* 0xc00 - Not affected by Soft Reset */
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u32 fdcbt; /* 0xc04 - Not affected by Soft Reset */
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u32 fdcrc; /* 0xc08 */
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u32 _reserved9[199]; /* 0xc0c */
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u32 tx_smb_fd[18]; /* 0xf28 */
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u32 rx_smb0_fd[18]; /* 0xf70 */
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u32 rx_smb1_fd[18]; /* 0xfb8 */
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};
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static_assert(sizeof(struct flexcan_regs) == 0x4 * 18 + 0xfb8);
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struct flexcan_devtype_data {
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u32 quirks; /* quirks needed for different IP cores */
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};
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struct flexcan_stop_mode {
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struct regmap *gpr;
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u8 req_gpr;
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u8 req_bit;
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};
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struct flexcan_priv {
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struct can_priv can;
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struct can_rx_offload offload;
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struct device *dev;
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struct flexcan_regs __iomem *regs;
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struct flexcan_mb __iomem *tx_mb;
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struct flexcan_mb __iomem *tx_mb_reserved;
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u8 tx_mb_idx;
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u8 mb_count;
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u8 mb_size;
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u8 clk_src; /* clock source of CAN Protocol Engine */
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u8 scu_idx;
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u64 rx_mask;
|
|
u64 tx_mask;
|
|
u32 reg_ctrl_default;
|
|
|
|
struct clk *clk_ipg;
|
|
struct clk *clk_per;
|
|
const struct flexcan_devtype_data *devtype_data;
|
|
struct regulator *reg_xceiver;
|
|
struct flexcan_stop_mode stm;
|
|
|
|
/* IPC handle when setup stop mode by System Controller firmware(scfw) */
|
|
struct imx_sc_ipc *sc_ipc_handle;
|
|
|
|
/* Read and Write APIs */
|
|
u32 (*read)(void __iomem *addr);
|
|
void (*write)(u32 val, void __iomem *addr);
|
|
};
|
|
|
|
static const struct flexcan_devtype_data fsl_p1010_devtype_data = {
|
|
.quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE |
|
|
FLEXCAN_QUIRK_BROKEN_PERR_STATE |
|
|
FLEXCAN_QUIRK_DEFAULT_BIG_ENDIAN,
|
|
};
|
|
|
|
static const struct flexcan_devtype_data fsl_imx25_devtype_data = {
|
|
.quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE |
|
|
FLEXCAN_QUIRK_BROKEN_PERR_STATE,
|
|
};
|
|
|
|
static const struct flexcan_devtype_data fsl_imx28_devtype_data = {
|
|
.quirks = FLEXCAN_QUIRK_BROKEN_PERR_STATE,
|
|
};
|
|
|
|
static const struct flexcan_devtype_data fsl_imx6q_devtype_data = {
|
|
.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
|
|
FLEXCAN_QUIRK_USE_OFF_TIMESTAMP | FLEXCAN_QUIRK_BROKEN_PERR_STATE |
|
|
FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR,
|
|
};
|
|
|
|
static const struct flexcan_devtype_data fsl_imx8qm_devtype_data = {
|
|
.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
|
|
FLEXCAN_QUIRK_USE_OFF_TIMESTAMP | FLEXCAN_QUIRK_BROKEN_PERR_STATE |
|
|
FLEXCAN_QUIRK_SUPPORT_FD | FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW,
|
|
};
|
|
|
|
static struct flexcan_devtype_data fsl_imx8mp_devtype_data = {
|
|
.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
|
|
FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_OFF_TIMESTAMP |
|
|
FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR |
|
|
FLEXCAN_QUIRK_SUPPORT_FD | FLEXCAN_QUIRK_SUPPORT_ECC,
|
|
};
|
|
|
|
static const struct flexcan_devtype_data fsl_vf610_devtype_data = {
|
|
.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
|
|
FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_OFF_TIMESTAMP |
|
|
FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_SUPPORT_ECC,
|
|
};
|
|
|
|
static const struct flexcan_devtype_data fsl_ls1021a_r2_devtype_data = {
|
|
.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
|
|
FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_USE_OFF_TIMESTAMP,
|
|
};
|
|
|
|
static const struct flexcan_devtype_data fsl_lx2160a_r1_devtype_data = {
|
|
.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
|
|
FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_BROKEN_PERR_STATE |
|
|
FLEXCAN_QUIRK_USE_OFF_TIMESTAMP | FLEXCAN_QUIRK_SUPPORT_FD |
|
|
FLEXCAN_QUIRK_SUPPORT_ECC,
|
|
};
|
|
|
|
static const struct can_bittiming_const flexcan_bittiming_const = {
|
|
.name = DRV_NAME,
|
|
.tseg1_min = 4,
|
|
.tseg1_max = 16,
|
|
.tseg2_min = 2,
|
|
.tseg2_max = 8,
|
|
.sjw_max = 4,
|
|
.brp_min = 1,
|
|
.brp_max = 256,
|
|
.brp_inc = 1,
|
|
};
|
|
|
|
static const struct can_bittiming_const flexcan_fd_bittiming_const = {
|
|
.name = DRV_NAME,
|
|
.tseg1_min = 2,
|
|
.tseg1_max = 96,
|
|
.tseg2_min = 2,
|
|
.tseg2_max = 32,
|
|
.sjw_max = 16,
|
|
.brp_min = 1,
|
|
.brp_max = 1024,
|
|
.brp_inc = 1,
|
|
};
|
|
|
|
static const struct can_bittiming_const flexcan_fd_data_bittiming_const = {
|
|
.name = DRV_NAME,
|
|
.tseg1_min = 2,
|
|
.tseg1_max = 39,
|
|
.tseg2_min = 2,
|
|
.tseg2_max = 8,
|
|
.sjw_max = 4,
|
|
.brp_min = 1,
|
|
.brp_max = 1024,
|
|
.brp_inc = 1,
|
|
};
|
|
|
|
/* FlexCAN module is essentially modelled as a little-endian IP in most
|
|
* SoCs, i.e the registers as well as the message buffer areas are
|
|
* implemented in a little-endian fashion.
|
|
*
|
|
* However there are some SoCs (e.g. LS1021A) which implement the FlexCAN
|
|
* module in a big-endian fashion (i.e the registers as well as the
|
|
* message buffer areas are implemented in a big-endian way).
|
|
*
|
|
* In addition, the FlexCAN module can be found on SoCs having ARM or
|
|
* PPC cores. So, we need to abstract off the register read/write
|
|
* functions, ensuring that these cater to all the combinations of module
|
|
* endianness and underlying CPU endianness.
|
|
*/
|
|
static inline u32 flexcan_read_be(void __iomem *addr)
|
|
{
|
|
return ioread32be(addr);
|
|
}
|
|
|
|
static inline void flexcan_write_be(u32 val, void __iomem *addr)
|
|
{
|
|
iowrite32be(val, addr);
|
|
}
|
|
|
|
static inline u32 flexcan_read_le(void __iomem *addr)
|
|
{
|
|
return ioread32(addr);
|
|
}
|
|
|
|
static inline void flexcan_write_le(u32 val, void __iomem *addr)
|
|
{
|
|
iowrite32(val, addr);
|
|
}
|
|
|
|
static struct flexcan_mb __iomem *flexcan_get_mb(const struct flexcan_priv *priv,
|
|
u8 mb_index)
|
|
{
|
|
u8 bank_size;
|
|
bool bank;
|
|
|
|
if (WARN_ON(mb_index >= priv->mb_count))
|
|
return NULL;
|
|
|
|
bank_size = sizeof(priv->regs->mb[0]) / priv->mb_size;
|
|
|
|
bank = mb_index >= bank_size;
|
|
if (bank)
|
|
mb_index -= bank_size;
|
|
|
|
return (struct flexcan_mb __iomem *)
|
|
(&priv->regs->mb[bank][priv->mb_size * mb_index]);
|
|
}
|
|
|
|
static int flexcan_low_power_enter_ack(struct flexcan_priv *priv)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
|
|
|
|
while (timeout-- && !(priv->read(®s->mcr) & FLEXCAN_MCR_LPM_ACK))
|
|
udelay(10);
|
|
|
|
if (!(priv->read(®s->mcr) & FLEXCAN_MCR_LPM_ACK))
|
|
return -ETIMEDOUT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flexcan_low_power_exit_ack(struct flexcan_priv *priv)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
|
|
|
|
while (timeout-- && (priv->read(®s->mcr) & FLEXCAN_MCR_LPM_ACK))
|
|
udelay(10);
|
|
|
|
if (priv->read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)
|
|
return -ETIMEDOUT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void flexcan_enable_wakeup_irq(struct flexcan_priv *priv, bool enable)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg_mcr;
|
|
|
|
reg_mcr = priv->read(®s->mcr);
|
|
|
|
if (enable)
|
|
reg_mcr |= FLEXCAN_MCR_WAK_MSK;
|
|
else
|
|
reg_mcr &= ~FLEXCAN_MCR_WAK_MSK;
|
|
|
|
priv->write(reg_mcr, ®s->mcr);
|
|
}
|
|
|
|
static int flexcan_stop_mode_enable_scfw(struct flexcan_priv *priv, bool enabled)
|
|
{
|
|
u8 idx = priv->scu_idx;
|
|
u32 rsrc_id, val;
|
|
|
|
rsrc_id = IMX_SC_R_CAN(idx);
|
|
|
|
if (enabled)
|
|
val = 1;
|
|
else
|
|
val = 0;
|
|
|
|
/* stop mode request via scu firmware */
|
|
return imx_sc_misc_set_control(priv->sc_ipc_handle, rsrc_id,
|
|
IMX_SC_C_IPG_STOP, val);
|
|
}
|
|
|
|
static inline int flexcan_enter_stop_mode(struct flexcan_priv *priv)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg_mcr;
|
|
int ret;
|
|
|
|
reg_mcr = priv->read(®s->mcr);
|
|
reg_mcr |= FLEXCAN_MCR_SLF_WAK;
|
|
priv->write(reg_mcr, ®s->mcr);
|
|
|
|
/* enable stop request */
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW) {
|
|
ret = flexcan_stop_mode_enable_scfw(priv, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
} else {
|
|
regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr,
|
|
1 << priv->stm.req_bit, 1 << priv->stm.req_bit);
|
|
}
|
|
|
|
return flexcan_low_power_enter_ack(priv);
|
|
}
|
|
|
|
static inline int flexcan_exit_stop_mode(struct flexcan_priv *priv)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg_mcr;
|
|
int ret;
|
|
|
|
/* remove stop request */
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW) {
|
|
ret = flexcan_stop_mode_enable_scfw(priv, false);
|
|
if (ret < 0)
|
|
return ret;
|
|
} else {
|
|
regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr,
|
|
1 << priv->stm.req_bit, 0);
|
|
}
|
|
|
|
reg_mcr = priv->read(®s->mcr);
|
|
reg_mcr &= ~FLEXCAN_MCR_SLF_WAK;
|
|
priv->write(reg_mcr, ®s->mcr);
|
|
|
|
return flexcan_low_power_exit_ack(priv);
|
|
}
|
|
|
|
static inline void flexcan_error_irq_enable(const struct flexcan_priv *priv)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg_ctrl = (priv->reg_ctrl_default | FLEXCAN_CTRL_ERR_MSK);
|
|
|
|
priv->write(reg_ctrl, ®s->ctrl);
|
|
}
|
|
|
|
static inline void flexcan_error_irq_disable(const struct flexcan_priv *priv)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg_ctrl = (priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_MSK);
|
|
|
|
priv->write(reg_ctrl, ®s->ctrl);
|
|
}
|
|
|
|
static int flexcan_clks_enable(const struct flexcan_priv *priv)
|
|
{
|
|
int err;
|
|
|
|
err = clk_prepare_enable(priv->clk_ipg);
|
|
if (err)
|
|
return err;
|
|
|
|
err = clk_prepare_enable(priv->clk_per);
|
|
if (err)
|
|
clk_disable_unprepare(priv->clk_ipg);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void flexcan_clks_disable(const struct flexcan_priv *priv)
|
|
{
|
|
clk_disable_unprepare(priv->clk_per);
|
|
clk_disable_unprepare(priv->clk_ipg);
|
|
}
|
|
|
|
static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv)
|
|
{
|
|
if (!priv->reg_xceiver)
|
|
return 0;
|
|
|
|
return regulator_enable(priv->reg_xceiver);
|
|
}
|
|
|
|
static inline int flexcan_transceiver_disable(const struct flexcan_priv *priv)
|
|
{
|
|
if (!priv->reg_xceiver)
|
|
return 0;
|
|
|
|
return regulator_disable(priv->reg_xceiver);
|
|
}
|
|
|
|
static int flexcan_chip_enable(struct flexcan_priv *priv)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg;
|
|
|
|
reg = priv->read(®s->mcr);
|
|
reg &= ~FLEXCAN_MCR_MDIS;
|
|
priv->write(reg, ®s->mcr);
|
|
|
|
return flexcan_low_power_exit_ack(priv);
|
|
}
|
|
|
|
static int flexcan_chip_disable(struct flexcan_priv *priv)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg;
|
|
|
|
reg = priv->read(®s->mcr);
|
|
reg |= FLEXCAN_MCR_MDIS;
|
|
priv->write(reg, ®s->mcr);
|
|
|
|
return flexcan_low_power_enter_ack(priv);
|
|
}
|
|
|
|
static int flexcan_chip_freeze(struct flexcan_priv *priv)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
unsigned int timeout;
|
|
u32 bitrate = priv->can.bittiming.bitrate;
|
|
u32 reg;
|
|
|
|
if (bitrate)
|
|
timeout = 1000 * 1000 * 10 / bitrate;
|
|
else
|
|
timeout = FLEXCAN_TIMEOUT_US / 10;
|
|
|
|
reg = priv->read(®s->mcr);
|
|
reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT;
|
|
priv->write(reg, ®s->mcr);
|
|
|
|
while (timeout-- && !(priv->read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK))
|
|
udelay(100);
|
|
|
|
if (!(priv->read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK))
|
|
return -ETIMEDOUT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flexcan_chip_unfreeze(struct flexcan_priv *priv)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
|
|
u32 reg;
|
|
|
|
reg = priv->read(®s->mcr);
|
|
reg &= ~FLEXCAN_MCR_HALT;
|
|
priv->write(reg, ®s->mcr);
|
|
|
|
while (timeout-- && (priv->read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK))
|
|
udelay(10);
|
|
|
|
if (priv->read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)
|
|
return -ETIMEDOUT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flexcan_chip_softreset(struct flexcan_priv *priv)
|
|
{
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
|
|
|
|
priv->write(FLEXCAN_MCR_SOFTRST, ®s->mcr);
|
|
while (timeout-- && (priv->read(®s->mcr) & FLEXCAN_MCR_SOFTRST))
|
|
udelay(10);
|
|
|
|
if (priv->read(®s->mcr) & FLEXCAN_MCR_SOFTRST)
|
|
return -ETIMEDOUT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __flexcan_get_berr_counter(const struct net_device *dev,
|
|
struct can_berr_counter *bec)
|
|
{
|
|
const struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg = priv->read(®s->ecr);
|
|
|
|
bec->txerr = (reg >> 0) & 0xff;
|
|
bec->rxerr = (reg >> 8) & 0xff;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flexcan_get_berr_counter(const struct net_device *dev,
|
|
struct can_berr_counter *bec)
|
|
{
|
|
const struct flexcan_priv *priv = netdev_priv(dev);
|
|
int err;
|
|
|
|
err = pm_runtime_get_sync(priv->dev);
|
|
if (err < 0) {
|
|
pm_runtime_put_noidle(priv->dev);
|
|
return err;
|
|
}
|
|
|
|
err = __flexcan_get_berr_counter(dev, bec);
|
|
|
|
pm_runtime_put(priv->dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static netdev_tx_t flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
const struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
|
|
u32 can_id;
|
|
u32 data;
|
|
u32 ctrl = FLEXCAN_MB_CODE_TX_DATA | ((can_fd_len2dlc(cfd->len)) << 16);
|
|
int i;
|
|
|
|
if (can_dropped_invalid_skb(dev, skb))
|
|
return NETDEV_TX_OK;
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
if (cfd->can_id & CAN_EFF_FLAG) {
|
|
can_id = cfd->can_id & CAN_EFF_MASK;
|
|
ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR;
|
|
} else {
|
|
can_id = (cfd->can_id & CAN_SFF_MASK) << 18;
|
|
}
|
|
|
|
if (cfd->can_id & CAN_RTR_FLAG)
|
|
ctrl |= FLEXCAN_MB_CNT_RTR;
|
|
|
|
if (can_is_canfd_skb(skb)) {
|
|
ctrl |= FLEXCAN_MB_CNT_EDL;
|
|
|
|
if (cfd->flags & CANFD_BRS)
|
|
ctrl |= FLEXCAN_MB_CNT_BRS;
|
|
}
|
|
|
|
for (i = 0; i < cfd->len; i += sizeof(u32)) {
|
|
data = be32_to_cpup((__be32 *)&cfd->data[i]);
|
|
priv->write(data, &priv->tx_mb->data[i / sizeof(u32)]);
|
|
}
|
|
|
|
can_put_echo_skb(skb, dev, 0, 0);
|
|
|
|
priv->write(can_id, &priv->tx_mb->can_id);
|
|
priv->write(ctrl, &priv->tx_mb->can_ctrl);
|
|
|
|
/* Errata ERR005829 step8:
|
|
* Write twice INACTIVE(0x8) code to first MB.
|
|
*/
|
|
priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
|
|
&priv->tx_mb_reserved->can_ctrl);
|
|
priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
|
|
&priv->tx_mb_reserved->can_ctrl);
|
|
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static void flexcan_irq_bus_err(struct net_device *dev, u32 reg_esr)
|
|
{
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
struct sk_buff *skb;
|
|
struct can_frame *cf;
|
|
bool rx_errors = false, tx_errors = false;
|
|
u32 timestamp;
|
|
int err;
|
|
|
|
timestamp = priv->read(®s->timer) << 16;
|
|
|
|
skb = alloc_can_err_skb(dev, &cf);
|
|
if (unlikely(!skb))
|
|
return;
|
|
|
|
cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
|
|
|
|
if (reg_esr & FLEXCAN_ESR_BIT1_ERR) {
|
|
netdev_dbg(dev, "BIT1_ERR irq\n");
|
|
cf->data[2] |= CAN_ERR_PROT_BIT1;
|
|
tx_errors = true;
|
|
}
|
|
if (reg_esr & FLEXCAN_ESR_BIT0_ERR) {
|
|
netdev_dbg(dev, "BIT0_ERR irq\n");
|
|
cf->data[2] |= CAN_ERR_PROT_BIT0;
|
|
tx_errors = true;
|
|
}
|
|
if (reg_esr & FLEXCAN_ESR_ACK_ERR) {
|
|
netdev_dbg(dev, "ACK_ERR irq\n");
|
|
cf->can_id |= CAN_ERR_ACK;
|
|
cf->data[3] = CAN_ERR_PROT_LOC_ACK;
|
|
tx_errors = true;
|
|
}
|
|
if (reg_esr & FLEXCAN_ESR_CRC_ERR) {
|
|
netdev_dbg(dev, "CRC_ERR irq\n");
|
|
cf->data[2] |= CAN_ERR_PROT_BIT;
|
|
cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
|
|
rx_errors = true;
|
|
}
|
|
if (reg_esr & FLEXCAN_ESR_FRM_ERR) {
|
|
netdev_dbg(dev, "FRM_ERR irq\n");
|
|
cf->data[2] |= CAN_ERR_PROT_FORM;
|
|
rx_errors = true;
|
|
}
|
|
if (reg_esr & FLEXCAN_ESR_STF_ERR) {
|
|
netdev_dbg(dev, "STF_ERR irq\n");
|
|
cf->data[2] |= CAN_ERR_PROT_STUFF;
|
|
rx_errors = true;
|
|
}
|
|
|
|
priv->can.can_stats.bus_error++;
|
|
if (rx_errors)
|
|
dev->stats.rx_errors++;
|
|
if (tx_errors)
|
|
dev->stats.tx_errors++;
|
|
|
|
err = can_rx_offload_queue_sorted(&priv->offload, skb, timestamp);
|
|
if (err)
|
|
dev->stats.rx_fifo_errors++;
|
|
}
|
|
|
|
static void flexcan_irq_state(struct net_device *dev, u32 reg_esr)
|
|
{
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
struct sk_buff *skb;
|
|
struct can_frame *cf;
|
|
enum can_state new_state, rx_state, tx_state;
|
|
int flt;
|
|
struct can_berr_counter bec;
|
|
u32 timestamp;
|
|
int err;
|
|
|
|
flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK;
|
|
if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) {
|
|
tx_state = unlikely(reg_esr & FLEXCAN_ESR_TX_WRN) ?
|
|
CAN_STATE_ERROR_WARNING : CAN_STATE_ERROR_ACTIVE;
|
|
rx_state = unlikely(reg_esr & FLEXCAN_ESR_RX_WRN) ?
|
|
CAN_STATE_ERROR_WARNING : CAN_STATE_ERROR_ACTIVE;
|
|
new_state = max(tx_state, rx_state);
|
|
} else {
|
|
__flexcan_get_berr_counter(dev, &bec);
|
|
new_state = flt == FLEXCAN_ESR_FLT_CONF_PASSIVE ?
|
|
CAN_STATE_ERROR_PASSIVE : CAN_STATE_BUS_OFF;
|
|
rx_state = bec.rxerr >= bec.txerr ? new_state : 0;
|
|
tx_state = bec.rxerr <= bec.txerr ? new_state : 0;
|
|
}
|
|
|
|
/* state hasn't changed */
|
|
if (likely(new_state == priv->can.state))
|
|
return;
|
|
|
|
timestamp = priv->read(®s->timer) << 16;
|
|
|
|
skb = alloc_can_err_skb(dev, &cf);
|
|
if (unlikely(!skb))
|
|
return;
|
|
|
|
can_change_state(dev, cf, tx_state, rx_state);
|
|
|
|
if (unlikely(new_state == CAN_STATE_BUS_OFF))
|
|
can_bus_off(dev);
|
|
|
|
err = can_rx_offload_queue_sorted(&priv->offload, skb, timestamp);
|
|
if (err)
|
|
dev->stats.rx_fifo_errors++;
|
|
}
|
|
|
|
static inline u64 flexcan_read64_mask(struct flexcan_priv *priv, void __iomem *addr, u64 mask)
|
|
{
|
|
u64 reg = 0;
|
|
|
|
if (upper_32_bits(mask))
|
|
reg = (u64)priv->read(addr - 4) << 32;
|
|
if (lower_32_bits(mask))
|
|
reg |= priv->read(addr);
|
|
|
|
return reg & mask;
|
|
}
|
|
|
|
static inline void flexcan_write64(struct flexcan_priv *priv, u64 val, void __iomem *addr)
|
|
{
|
|
if (upper_32_bits(val))
|
|
priv->write(upper_32_bits(val), addr - 4);
|
|
if (lower_32_bits(val))
|
|
priv->write(lower_32_bits(val), addr);
|
|
}
|
|
|
|
static inline u64 flexcan_read_reg_iflag_rx(struct flexcan_priv *priv)
|
|
{
|
|
return flexcan_read64_mask(priv, &priv->regs->iflag1, priv->rx_mask);
|
|
}
|
|
|
|
static inline u64 flexcan_read_reg_iflag_tx(struct flexcan_priv *priv)
|
|
{
|
|
return flexcan_read64_mask(priv, &priv->regs->iflag1, priv->tx_mask);
|
|
}
|
|
|
|
static inline struct flexcan_priv *rx_offload_to_priv(struct can_rx_offload *offload)
|
|
{
|
|
return container_of(offload, struct flexcan_priv, offload);
|
|
}
|
|
|
|
static struct sk_buff *flexcan_mailbox_read(struct can_rx_offload *offload,
|
|
unsigned int n, u32 *timestamp,
|
|
bool drop)
|
|
{
|
|
struct flexcan_priv *priv = rx_offload_to_priv(offload);
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
struct flexcan_mb __iomem *mb;
|
|
struct sk_buff *skb;
|
|
struct canfd_frame *cfd;
|
|
u32 reg_ctrl, reg_id, reg_iflag1;
|
|
int i;
|
|
|
|
if (unlikely(drop)) {
|
|
skb = ERR_PTR(-ENOBUFS);
|
|
goto mark_as_read;
|
|
}
|
|
|
|
mb = flexcan_get_mb(priv, n);
|
|
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
|
|
u32 code;
|
|
|
|
do {
|
|
reg_ctrl = priv->read(&mb->can_ctrl);
|
|
} while (reg_ctrl & FLEXCAN_MB_CODE_RX_BUSY_BIT);
|
|
|
|
/* is this MB empty? */
|
|
code = reg_ctrl & FLEXCAN_MB_CODE_MASK;
|
|
if ((code != FLEXCAN_MB_CODE_RX_FULL) &&
|
|
(code != FLEXCAN_MB_CODE_RX_OVERRUN))
|
|
return NULL;
|
|
|
|
if (code == FLEXCAN_MB_CODE_RX_OVERRUN) {
|
|
/* This MB was overrun, we lost data */
|
|
offload->dev->stats.rx_over_errors++;
|
|
offload->dev->stats.rx_errors++;
|
|
}
|
|
} else {
|
|
reg_iflag1 = priv->read(®s->iflag1);
|
|
if (!(reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE))
|
|
return NULL;
|
|
|
|
reg_ctrl = priv->read(&mb->can_ctrl);
|
|
}
|
|
|
|
if (reg_ctrl & FLEXCAN_MB_CNT_EDL)
|
|
skb = alloc_canfd_skb(offload->dev, &cfd);
|
|
else
|
|
skb = alloc_can_skb(offload->dev, (struct can_frame **)&cfd);
|
|
if (unlikely(!skb)) {
|
|
skb = ERR_PTR(-ENOMEM);
|
|
goto mark_as_read;
|
|
}
|
|
|
|
/* increase timstamp to full 32 bit */
|
|
*timestamp = reg_ctrl << 16;
|
|
|
|
reg_id = priv->read(&mb->can_id);
|
|
if (reg_ctrl & FLEXCAN_MB_CNT_IDE)
|
|
cfd->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG;
|
|
else
|
|
cfd->can_id = (reg_id >> 18) & CAN_SFF_MASK;
|
|
|
|
if (reg_ctrl & FLEXCAN_MB_CNT_EDL) {
|
|
cfd->len = can_fd_dlc2len((reg_ctrl >> 16) & 0xf);
|
|
|
|
if (reg_ctrl & FLEXCAN_MB_CNT_BRS)
|
|
cfd->flags |= CANFD_BRS;
|
|
} else {
|
|
cfd->len = can_cc_dlc2len((reg_ctrl >> 16) & 0xf);
|
|
|
|
if (reg_ctrl & FLEXCAN_MB_CNT_RTR)
|
|
cfd->can_id |= CAN_RTR_FLAG;
|
|
}
|
|
|
|
if (reg_ctrl & FLEXCAN_MB_CNT_ESI)
|
|
cfd->flags |= CANFD_ESI;
|
|
|
|
for (i = 0; i < cfd->len; i += sizeof(u32)) {
|
|
__be32 data = cpu_to_be32(priv->read(&mb->data[i / sizeof(u32)]));
|
|
*(__be32 *)(cfd->data + i) = data;
|
|
}
|
|
|
|
mark_as_read:
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP)
|
|
flexcan_write64(priv, FLEXCAN_IFLAG_MB(n), ®s->iflag1);
|
|
else
|
|
priv->write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1);
|
|
|
|
/* Read the Free Running Timer. It is optional but recommended
|
|
* to unlock Mailbox as soon as possible and make it available
|
|
* for reception.
|
|
*/
|
|
priv->read(®s->timer);
|
|
|
|
return skb;
|
|
}
|
|
|
|
static irqreturn_t flexcan_irq(int irq, void *dev_id)
|
|
{
|
|
struct net_device *dev = dev_id;
|
|
struct net_device_stats *stats = &dev->stats;
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
irqreturn_t handled = IRQ_NONE;
|
|
u64 reg_iflag_tx;
|
|
u32 reg_esr;
|
|
enum can_state last_state = priv->can.state;
|
|
|
|
/* reception interrupt */
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
|
|
u64 reg_iflag_rx;
|
|
int ret;
|
|
|
|
while ((reg_iflag_rx = flexcan_read_reg_iflag_rx(priv))) {
|
|
handled = IRQ_HANDLED;
|
|
ret = can_rx_offload_irq_offload_timestamp(&priv->offload,
|
|
reg_iflag_rx);
|
|
if (!ret)
|
|
break;
|
|
}
|
|
} else {
|
|
u32 reg_iflag1;
|
|
|
|
reg_iflag1 = priv->read(®s->iflag1);
|
|
if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) {
|
|
handled = IRQ_HANDLED;
|
|
can_rx_offload_irq_offload_fifo(&priv->offload);
|
|
}
|
|
|
|
/* FIFO overflow interrupt */
|
|
if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) {
|
|
handled = IRQ_HANDLED;
|
|
priv->write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW,
|
|
®s->iflag1);
|
|
dev->stats.rx_over_errors++;
|
|
dev->stats.rx_errors++;
|
|
}
|
|
}
|
|
|
|
reg_iflag_tx = flexcan_read_reg_iflag_tx(priv);
|
|
|
|
/* transmission complete interrupt */
|
|
if (reg_iflag_tx & priv->tx_mask) {
|
|
u32 reg_ctrl = priv->read(&priv->tx_mb->can_ctrl);
|
|
|
|
handled = IRQ_HANDLED;
|
|
stats->tx_bytes +=
|
|
can_rx_offload_get_echo_skb(&priv->offload, 0,
|
|
reg_ctrl << 16, NULL);
|
|
stats->tx_packets++;
|
|
can_led_event(dev, CAN_LED_EVENT_TX);
|
|
|
|
/* after sending a RTR frame MB is in RX mode */
|
|
priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
|
|
&priv->tx_mb->can_ctrl);
|
|
flexcan_write64(priv, priv->tx_mask, ®s->iflag1);
|
|
netif_wake_queue(dev);
|
|
}
|
|
|
|
reg_esr = priv->read(®s->esr);
|
|
|
|
/* ACK all bus error, state change and wake IRQ sources */
|
|
if (reg_esr & (FLEXCAN_ESR_ALL_INT | FLEXCAN_ESR_WAK_INT)) {
|
|
handled = IRQ_HANDLED;
|
|
priv->write(reg_esr & (FLEXCAN_ESR_ALL_INT | FLEXCAN_ESR_WAK_INT), ®s->esr);
|
|
}
|
|
|
|
/* state change interrupt or broken error state quirk fix is enabled */
|
|
if ((reg_esr & FLEXCAN_ESR_ERR_STATE) ||
|
|
(priv->devtype_data->quirks & (FLEXCAN_QUIRK_BROKEN_WERR_STATE |
|
|
FLEXCAN_QUIRK_BROKEN_PERR_STATE)))
|
|
flexcan_irq_state(dev, reg_esr);
|
|
|
|
/* bus error IRQ - handle if bus error reporting is activated */
|
|
if ((reg_esr & FLEXCAN_ESR_ERR_BUS) &&
|
|
(priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING))
|
|
flexcan_irq_bus_err(dev, reg_esr);
|
|
|
|
/* availability of error interrupt among state transitions in case
|
|
* bus error reporting is de-activated and
|
|
* FLEXCAN_QUIRK_BROKEN_PERR_STATE is enabled:
|
|
* +--------------------------------------------------------------+
|
|
* | +----------------------------------------------+ [stopped / |
|
|
* | | | sleeping] -+
|
|
* +-+-> active <-> warning <-> passive -> bus off -+
|
|
* ___________^^^^^^^^^^^^_______________________________
|
|
* disabled(1) enabled disabled
|
|
*
|
|
* (1): enabled if FLEXCAN_QUIRK_BROKEN_WERR_STATE is enabled
|
|
*/
|
|
if ((last_state != priv->can.state) &&
|
|
(priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_PERR_STATE) &&
|
|
!(priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) {
|
|
switch (priv->can.state) {
|
|
case CAN_STATE_ERROR_ACTIVE:
|
|
if (priv->devtype_data->quirks &
|
|
FLEXCAN_QUIRK_BROKEN_WERR_STATE)
|
|
flexcan_error_irq_enable(priv);
|
|
else
|
|
flexcan_error_irq_disable(priv);
|
|
break;
|
|
|
|
case CAN_STATE_ERROR_WARNING:
|
|
flexcan_error_irq_enable(priv);
|
|
break;
|
|
|
|
case CAN_STATE_ERROR_PASSIVE:
|
|
case CAN_STATE_BUS_OFF:
|
|
flexcan_error_irq_disable(priv);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return handled;
|
|
}
|
|
|
|
static void flexcan_set_bittiming_ctrl(const struct net_device *dev)
|
|
{
|
|
const struct flexcan_priv *priv = netdev_priv(dev);
|
|
const struct can_bittiming *bt = &priv->can.bittiming;
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg;
|
|
|
|
reg = priv->read(®s->ctrl);
|
|
reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) |
|
|
FLEXCAN_CTRL_RJW(0x3) |
|
|
FLEXCAN_CTRL_PSEG1(0x7) |
|
|
FLEXCAN_CTRL_PSEG2(0x7) |
|
|
FLEXCAN_CTRL_PROPSEG(0x7));
|
|
|
|
reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) |
|
|
FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) |
|
|
FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) |
|
|
FLEXCAN_CTRL_RJW(bt->sjw - 1) |
|
|
FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1);
|
|
|
|
netdev_dbg(dev, "writing ctrl=0x%08x\n", reg);
|
|
priv->write(reg, ®s->ctrl);
|
|
|
|
/* print chip status */
|
|
netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__,
|
|
priv->read(®s->mcr), priv->read(®s->ctrl));
|
|
}
|
|
|
|
static void flexcan_set_bittiming_cbt(const struct net_device *dev)
|
|
{
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct can_bittiming *bt = &priv->can.bittiming;
|
|
struct can_bittiming *dbt = &priv->can.data_bittiming;
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg_cbt, reg_fdctrl;
|
|
|
|
/* CBT */
|
|
/* CBT[EPSEG1] is 5 bit long and CBT[EPROPSEG] is 6 bit
|
|
* long. The can_calc_bittiming() tries to divide the tseg1
|
|
* equally between phase_seg1 and prop_seg, which may not fit
|
|
* in CBT register. Therefore, if phase_seg1 is more than
|
|
* possible value, increase prop_seg and decrease phase_seg1.
|
|
*/
|
|
if (bt->phase_seg1 > 0x20) {
|
|
bt->prop_seg += (bt->phase_seg1 - 0x20);
|
|
bt->phase_seg1 = 0x20;
|
|
}
|
|
|
|
reg_cbt = FLEXCAN_CBT_BTF |
|
|
FIELD_PREP(FLEXCAN_CBT_EPRESDIV_MASK, bt->brp - 1) |
|
|
FIELD_PREP(FLEXCAN_CBT_ERJW_MASK, bt->sjw - 1) |
|
|
FIELD_PREP(FLEXCAN_CBT_EPROPSEG_MASK, bt->prop_seg - 1) |
|
|
FIELD_PREP(FLEXCAN_CBT_EPSEG1_MASK, bt->phase_seg1 - 1) |
|
|
FIELD_PREP(FLEXCAN_CBT_EPSEG2_MASK, bt->phase_seg2 - 1);
|
|
|
|
netdev_dbg(dev, "writing cbt=0x%08x\n", reg_cbt);
|
|
priv->write(reg_cbt, ®s->cbt);
|
|
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
|
|
u32 reg_fdcbt, reg_ctrl2;
|
|
|
|
if (bt->brp != dbt->brp)
|
|
netdev_warn(dev, "Data brp=%d and brp=%d don't match, this may result in a phase error. Consider using different bitrate and/or data bitrate.\n",
|
|
dbt->brp, bt->brp);
|
|
|
|
/* FDCBT */
|
|
/* FDCBT[FPSEG1] is 3 bit long and FDCBT[FPROPSEG] is
|
|
* 5 bit long. The can_calc_bittiming tries to divide
|
|
* the tseg1 equally between phase_seg1 and prop_seg,
|
|
* which may not fit in FDCBT register. Therefore, if
|
|
* phase_seg1 is more than possible value, increase
|
|
* prop_seg and decrease phase_seg1
|
|
*/
|
|
if (dbt->phase_seg1 > 0x8) {
|
|
dbt->prop_seg += (dbt->phase_seg1 - 0x8);
|
|
dbt->phase_seg1 = 0x8;
|
|
}
|
|
|
|
reg_fdcbt = priv->read(®s->fdcbt);
|
|
reg_fdcbt &= ~(FIELD_PREP(FLEXCAN_FDCBT_FPRESDIV_MASK, 0x3ff) |
|
|
FIELD_PREP(FLEXCAN_FDCBT_FRJW_MASK, 0x7) |
|
|
FIELD_PREP(FLEXCAN_FDCBT_FPROPSEG_MASK, 0x1f) |
|
|
FIELD_PREP(FLEXCAN_FDCBT_FPSEG1_MASK, 0x7) |
|
|
FIELD_PREP(FLEXCAN_FDCBT_FPSEG2_MASK, 0x7));
|
|
|
|
reg_fdcbt |= FIELD_PREP(FLEXCAN_FDCBT_FPRESDIV_MASK, dbt->brp - 1) |
|
|
FIELD_PREP(FLEXCAN_FDCBT_FRJW_MASK, dbt->sjw - 1) |
|
|
FIELD_PREP(FLEXCAN_FDCBT_FPROPSEG_MASK, dbt->prop_seg) |
|
|
FIELD_PREP(FLEXCAN_FDCBT_FPSEG1_MASK, dbt->phase_seg1 - 1) |
|
|
FIELD_PREP(FLEXCAN_FDCBT_FPSEG2_MASK, dbt->phase_seg2 - 1);
|
|
|
|
netdev_dbg(dev, "writing fdcbt=0x%08x\n", reg_fdcbt);
|
|
priv->write(reg_fdcbt, ®s->fdcbt);
|
|
|
|
/* CTRL2 */
|
|
reg_ctrl2 = priv->read(®s->ctrl2);
|
|
reg_ctrl2 &= ~FLEXCAN_CTRL2_ISOCANFDEN;
|
|
if (!(priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO))
|
|
reg_ctrl2 |= FLEXCAN_CTRL2_ISOCANFDEN;
|
|
|
|
netdev_dbg(dev, "writing ctrl2=0x%08x\n", reg_ctrl2);
|
|
priv->write(reg_ctrl2, ®s->ctrl2);
|
|
}
|
|
|
|
/* FDCTRL */
|
|
reg_fdctrl = priv->read(®s->fdctrl);
|
|
reg_fdctrl &= ~(FLEXCAN_FDCTRL_FDRATE |
|
|
FIELD_PREP(FLEXCAN_FDCTRL_TDCOFF, 0x1f));
|
|
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
|
|
reg_fdctrl |= FLEXCAN_FDCTRL_FDRATE;
|
|
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
|
|
/* TDC must be disabled for Loop Back mode */
|
|
reg_fdctrl &= ~FLEXCAN_FDCTRL_TDCEN;
|
|
} else {
|
|
reg_fdctrl |= FLEXCAN_FDCTRL_TDCEN |
|
|
FIELD_PREP(FLEXCAN_FDCTRL_TDCOFF,
|
|
((dbt->phase_seg1 - 1) +
|
|
dbt->prop_seg + 2) *
|
|
((dbt->brp - 1 ) + 1));
|
|
}
|
|
}
|
|
|
|
netdev_dbg(dev, "writing fdctrl=0x%08x\n", reg_fdctrl);
|
|
priv->write(reg_fdctrl, ®s->fdctrl);
|
|
|
|
netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x ctrl2=0x%08x fdctrl=0x%08x cbt=0x%08x fdcbt=0x%08x\n",
|
|
__func__,
|
|
priv->read(®s->mcr), priv->read(®s->ctrl),
|
|
priv->read(®s->ctrl2), priv->read(®s->fdctrl),
|
|
priv->read(®s->cbt), priv->read(®s->fdcbt));
|
|
}
|
|
|
|
static void flexcan_set_bittiming(struct net_device *dev)
|
|
{
|
|
const struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg;
|
|
|
|
reg = priv->read(®s->ctrl);
|
|
reg &= ~(FLEXCAN_CTRL_LPB | FLEXCAN_CTRL_SMP |
|
|
FLEXCAN_CTRL_LOM);
|
|
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
|
|
reg |= FLEXCAN_CTRL_LPB;
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
|
|
reg |= FLEXCAN_CTRL_LOM;
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
|
|
reg |= FLEXCAN_CTRL_SMP;
|
|
|
|
netdev_dbg(dev, "writing ctrl=0x%08x\n", reg);
|
|
priv->write(reg, ®s->ctrl);
|
|
|
|
if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD)
|
|
return flexcan_set_bittiming_cbt(dev);
|
|
else
|
|
return flexcan_set_bittiming_ctrl(dev);
|
|
}
|
|
|
|
static void flexcan_ram_init(struct net_device *dev)
|
|
{
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg_ctrl2;
|
|
|
|
/* 11.8.3.13 Detection and correction of memory errors:
|
|
* CTRL2[WRMFRZ] grants write access to all memory positions
|
|
* that require initialization, ranging from 0x080 to 0xADF
|
|
* and from 0xF28 to 0xFFF when the CAN FD feature is enabled.
|
|
* The RXMGMASK, RX14MASK, RX15MASK, and RXFGMASK registers
|
|
* need to be initialized as well. MCR[RFEN] must not be set
|
|
* during memory initialization.
|
|
*/
|
|
reg_ctrl2 = priv->read(®s->ctrl2);
|
|
reg_ctrl2 |= FLEXCAN_CTRL2_WRMFRZ;
|
|
priv->write(reg_ctrl2, ®s->ctrl2);
|
|
|
|
memset_io(®s->mb[0][0], 0,
|
|
offsetof(struct flexcan_regs, rx_smb1[3]) -
|
|
offsetof(struct flexcan_regs, mb[0][0]) + 0x4);
|
|
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
|
|
memset_io(®s->tx_smb_fd[0], 0,
|
|
offsetof(struct flexcan_regs, rx_smb1_fd[17]) -
|
|
offsetof(struct flexcan_regs, tx_smb_fd[0]) + 0x4);
|
|
|
|
reg_ctrl2 &= ~FLEXCAN_CTRL2_WRMFRZ;
|
|
priv->write(reg_ctrl2, ®s->ctrl2);
|
|
}
|
|
|
|
static int flexcan_rx_offload_setup(struct net_device *dev)
|
|
{
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
int err;
|
|
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
|
|
priv->mb_size = sizeof(struct flexcan_mb) + CANFD_MAX_DLEN;
|
|
else
|
|
priv->mb_size = sizeof(struct flexcan_mb) + CAN_MAX_DLEN;
|
|
priv->mb_count = (sizeof(priv->regs->mb[0]) / priv->mb_size) +
|
|
(sizeof(priv->regs->mb[1]) / priv->mb_size);
|
|
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP)
|
|
priv->tx_mb_reserved =
|
|
flexcan_get_mb(priv, FLEXCAN_TX_MB_RESERVED_OFF_TIMESTAMP);
|
|
else
|
|
priv->tx_mb_reserved =
|
|
flexcan_get_mb(priv, FLEXCAN_TX_MB_RESERVED_OFF_FIFO);
|
|
priv->tx_mb_idx = priv->mb_count - 1;
|
|
priv->tx_mb = flexcan_get_mb(priv, priv->tx_mb_idx);
|
|
priv->tx_mask = FLEXCAN_IFLAG_MB(priv->tx_mb_idx);
|
|
|
|
priv->offload.mailbox_read = flexcan_mailbox_read;
|
|
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
|
|
priv->offload.mb_first = FLEXCAN_RX_MB_OFF_TIMESTAMP_FIRST;
|
|
priv->offload.mb_last = priv->mb_count - 2;
|
|
|
|
priv->rx_mask = GENMASK_ULL(priv->offload.mb_last,
|
|
priv->offload.mb_first);
|
|
err = can_rx_offload_add_timestamp(dev, &priv->offload);
|
|
} else {
|
|
priv->rx_mask = FLEXCAN_IFLAG_RX_FIFO_OVERFLOW |
|
|
FLEXCAN_IFLAG_RX_FIFO_AVAILABLE;
|
|
err = can_rx_offload_add_fifo(dev, &priv->offload,
|
|
FLEXCAN_NAPI_WEIGHT);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void flexcan_chip_interrupts_enable(const struct net_device *dev)
|
|
{
|
|
const struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u64 reg_imask;
|
|
|
|
disable_irq(dev->irq);
|
|
priv->write(priv->reg_ctrl_default, ®s->ctrl);
|
|
reg_imask = priv->rx_mask | priv->tx_mask;
|
|
priv->write(upper_32_bits(reg_imask), ®s->imask2);
|
|
priv->write(lower_32_bits(reg_imask), ®s->imask1);
|
|
enable_irq(dev->irq);
|
|
}
|
|
|
|
static void flexcan_chip_interrupts_disable(const struct net_device *dev)
|
|
{
|
|
const struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
|
|
priv->write(0, ®s->imask2);
|
|
priv->write(0, ®s->imask1);
|
|
priv->write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL,
|
|
®s->ctrl);
|
|
}
|
|
|
|
/* flexcan_chip_start
|
|
*
|
|
* this functions is entered with clocks enabled
|
|
*
|
|
*/
|
|
static int flexcan_chip_start(struct net_device *dev)
|
|
{
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg_mcr, reg_ctrl, reg_ctrl2, reg_mecr;
|
|
int err, i;
|
|
struct flexcan_mb __iomem *mb;
|
|
|
|
/* enable module */
|
|
err = flexcan_chip_enable(priv);
|
|
if (err)
|
|
return err;
|
|
|
|
/* soft reset */
|
|
err = flexcan_chip_softreset(priv);
|
|
if (err)
|
|
goto out_chip_disable;
|
|
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_SUPPORT_ECC)
|
|
flexcan_ram_init(dev);
|
|
|
|
flexcan_set_bittiming(dev);
|
|
|
|
/* set freeze, halt */
|
|
err = flexcan_chip_freeze(priv);
|
|
if (err)
|
|
goto out_chip_disable;
|
|
|
|
/* MCR
|
|
*
|
|
* only supervisor access
|
|
* enable warning int
|
|
* enable individual RX masking
|
|
* choose format C
|
|
* set max mailbox number
|
|
*/
|
|
reg_mcr = priv->read(®s->mcr);
|
|
reg_mcr &= ~FLEXCAN_MCR_MAXMB(0xff);
|
|
reg_mcr |= FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | FLEXCAN_MCR_IRMQ |
|
|
FLEXCAN_MCR_IDAM_C | FLEXCAN_MCR_MAXMB(priv->tx_mb_idx);
|
|
|
|
/* MCR
|
|
*
|
|
* FIFO:
|
|
* - disable for timestamp mode
|
|
* - enable for FIFO mode
|
|
*/
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP)
|
|
reg_mcr &= ~FLEXCAN_MCR_FEN;
|
|
else
|
|
reg_mcr |= FLEXCAN_MCR_FEN;
|
|
|
|
/* MCR
|
|
*
|
|
* NOTE: In loopback mode, the CAN_MCR[SRXDIS] cannot be
|
|
* asserted because this will impede the self reception
|
|
* of a transmitted message. This is not documented in
|
|
* earlier versions of flexcan block guide.
|
|
*
|
|
* Self Reception:
|
|
* - enable Self Reception for loopback mode
|
|
* (by clearing "Self Reception Disable" bit)
|
|
* - disable for normal operation
|
|
*/
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
|
|
reg_mcr &= ~FLEXCAN_MCR_SRX_DIS;
|
|
else
|
|
reg_mcr |= FLEXCAN_MCR_SRX_DIS;
|
|
|
|
/* MCR - CAN-FD */
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
|
|
reg_mcr |= FLEXCAN_MCR_FDEN;
|
|
else
|
|
reg_mcr &= ~FLEXCAN_MCR_FDEN;
|
|
|
|
netdev_dbg(dev, "%s: writing mcr=0x%08x", __func__, reg_mcr);
|
|
priv->write(reg_mcr, ®s->mcr);
|
|
|
|
/* CTRL
|
|
*
|
|
* disable timer sync feature
|
|
*
|
|
* disable auto busoff recovery
|
|
* transmit lowest buffer first
|
|
*
|
|
* enable tx and rx warning interrupt
|
|
* enable bus off interrupt
|
|
* (== FLEXCAN_CTRL_ERR_STATE)
|
|
*/
|
|
reg_ctrl = priv->read(®s->ctrl);
|
|
reg_ctrl &= ~FLEXCAN_CTRL_TSYN;
|
|
reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF |
|
|
FLEXCAN_CTRL_ERR_STATE;
|
|
|
|
/* enable the "error interrupt" (FLEXCAN_CTRL_ERR_MSK),
|
|
* on most Flexcan cores, too. Otherwise we don't get
|
|
* any error warning or passive interrupts.
|
|
*/
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_WERR_STATE ||
|
|
priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
|
|
reg_ctrl |= FLEXCAN_CTRL_ERR_MSK;
|
|
else
|
|
reg_ctrl &= ~FLEXCAN_CTRL_ERR_MSK;
|
|
|
|
/* save for later use */
|
|
priv->reg_ctrl_default = reg_ctrl;
|
|
/* leave interrupts disabled for now */
|
|
reg_ctrl &= ~FLEXCAN_CTRL_ERR_ALL;
|
|
netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl);
|
|
priv->write(reg_ctrl, ®s->ctrl);
|
|
|
|
if ((priv->devtype_data->quirks & FLEXCAN_QUIRK_ENABLE_EACEN_RRS)) {
|
|
reg_ctrl2 = priv->read(®s->ctrl2);
|
|
reg_ctrl2 |= FLEXCAN_CTRL2_EACEN | FLEXCAN_CTRL2_RRS;
|
|
priv->write(reg_ctrl2, ®s->ctrl2);
|
|
}
|
|
|
|
if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD) {
|
|
u32 reg_fdctrl;
|
|
|
|
reg_fdctrl = priv->read(®s->fdctrl);
|
|
reg_fdctrl &= ~(FIELD_PREP(FLEXCAN_FDCTRL_MBDSR1, 0x3) |
|
|
FIELD_PREP(FLEXCAN_FDCTRL_MBDSR0, 0x3));
|
|
|
|
if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
|
|
reg_fdctrl |=
|
|
FIELD_PREP(FLEXCAN_FDCTRL_MBDSR1,
|
|
FLEXCAN_FDCTRL_MBDSR_64) |
|
|
FIELD_PREP(FLEXCAN_FDCTRL_MBDSR0,
|
|
FLEXCAN_FDCTRL_MBDSR_64);
|
|
} else {
|
|
reg_fdctrl |=
|
|
FIELD_PREP(FLEXCAN_FDCTRL_MBDSR1,
|
|
FLEXCAN_FDCTRL_MBDSR_8) |
|
|
FIELD_PREP(FLEXCAN_FDCTRL_MBDSR0,
|
|
FLEXCAN_FDCTRL_MBDSR_8);
|
|
}
|
|
|
|
netdev_dbg(dev, "%s: writing fdctrl=0x%08x",
|
|
__func__, reg_fdctrl);
|
|
priv->write(reg_fdctrl, ®s->fdctrl);
|
|
}
|
|
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
|
|
for (i = priv->offload.mb_first; i <= priv->offload.mb_last; i++) {
|
|
mb = flexcan_get_mb(priv, i);
|
|
priv->write(FLEXCAN_MB_CODE_RX_EMPTY,
|
|
&mb->can_ctrl);
|
|
}
|
|
} else {
|
|
/* clear and invalidate unused mailboxes first */
|
|
for (i = FLEXCAN_TX_MB_RESERVED_OFF_FIFO; i < priv->mb_count; i++) {
|
|
mb = flexcan_get_mb(priv, i);
|
|
priv->write(FLEXCAN_MB_CODE_RX_INACTIVE,
|
|
&mb->can_ctrl);
|
|
}
|
|
}
|
|
|
|
/* Errata ERR005829: mark first TX mailbox as INACTIVE */
|
|
priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
|
|
&priv->tx_mb_reserved->can_ctrl);
|
|
|
|
/* mark TX mailbox as INACTIVE */
|
|
priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
|
|
&priv->tx_mb->can_ctrl);
|
|
|
|
/* acceptance mask/acceptance code (accept everything) */
|
|
priv->write(0x0, ®s->rxgmask);
|
|
priv->write(0x0, ®s->rx14mask);
|
|
priv->write(0x0, ®s->rx15mask);
|
|
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_DISABLE_RXFG)
|
|
priv->write(0x0, ®s->rxfgmask);
|
|
|
|
/* clear acceptance filters */
|
|
for (i = 0; i < priv->mb_count; i++)
|
|
priv->write(0, ®s->rximr[i]);
|
|
|
|
/* On Vybrid, disable non-correctable errors interrupt and
|
|
* freeze mode. It still can correct the correctable errors
|
|
* when HW supports ECC.
|
|
*
|
|
* This also works around errata e5295 which generates false
|
|
* positive memory errors and put the device in freeze mode.
|
|
*/
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_DISABLE_MECR) {
|
|
/* Follow the protocol as described in "Detection
|
|
* and Correction of Memory Errors" to write to
|
|
* MECR register (step 1 - 5)
|
|
*
|
|
* 1. By default, CTRL2[ECRWRE] = 0, MECR[ECRWRDIS] = 1
|
|
* 2. set CTRL2[ECRWRE]
|
|
*/
|
|
reg_ctrl2 = priv->read(®s->ctrl2);
|
|
reg_ctrl2 |= FLEXCAN_CTRL2_ECRWRE;
|
|
priv->write(reg_ctrl2, ®s->ctrl2);
|
|
|
|
/* 3. clear MECR[ECRWRDIS] */
|
|
reg_mecr = priv->read(®s->mecr);
|
|
reg_mecr &= ~FLEXCAN_MECR_ECRWRDIS;
|
|
priv->write(reg_mecr, ®s->mecr);
|
|
|
|
/* 4. all writes to MECR must keep MECR[ECRWRDIS] cleared */
|
|
reg_mecr &= ~(FLEXCAN_MECR_NCEFAFRZ | FLEXCAN_MECR_HANCEI_MSK |
|
|
FLEXCAN_MECR_FANCEI_MSK);
|
|
priv->write(reg_mecr, ®s->mecr);
|
|
|
|
/* 5. after configuration done, lock MECR by either
|
|
* setting MECR[ECRWRDIS] or clearing CTRL2[ECRWRE]
|
|
*/
|
|
reg_mecr |= FLEXCAN_MECR_ECRWRDIS;
|
|
priv->write(reg_mecr, ®s->mecr);
|
|
|
|
reg_ctrl2 &= ~FLEXCAN_CTRL2_ECRWRE;
|
|
priv->write(reg_ctrl2, ®s->ctrl2);
|
|
}
|
|
|
|
/* synchronize with the can bus */
|
|
err = flexcan_chip_unfreeze(priv);
|
|
if (err)
|
|
goto out_chip_disable;
|
|
|
|
priv->can.state = CAN_STATE_ERROR_ACTIVE;
|
|
|
|
/* print chip status */
|
|
netdev_dbg(dev, "%s: reading mcr=0x%08x ctrl=0x%08x\n", __func__,
|
|
priv->read(®s->mcr), priv->read(®s->ctrl));
|
|
|
|
return 0;
|
|
|
|
out_chip_disable:
|
|
flexcan_chip_disable(priv);
|
|
return err;
|
|
}
|
|
|
|
/* __flexcan_chip_stop
|
|
*
|
|
* this function is entered with clocks enabled
|
|
*/
|
|
static int __flexcan_chip_stop(struct net_device *dev, bool disable_on_error)
|
|
{
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
int err;
|
|
|
|
/* freeze + disable module */
|
|
err = flexcan_chip_freeze(priv);
|
|
if (err && !disable_on_error)
|
|
return err;
|
|
err = flexcan_chip_disable(priv);
|
|
if (err && !disable_on_error)
|
|
goto out_chip_unfreeze;
|
|
|
|
priv->can.state = CAN_STATE_STOPPED;
|
|
|
|
return 0;
|
|
|
|
out_chip_unfreeze:
|
|
flexcan_chip_unfreeze(priv);
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline int flexcan_chip_stop_disable_on_error(struct net_device *dev)
|
|
{
|
|
return __flexcan_chip_stop(dev, true);
|
|
}
|
|
|
|
static inline int flexcan_chip_stop(struct net_device *dev)
|
|
{
|
|
return __flexcan_chip_stop(dev, false);
|
|
}
|
|
|
|
static int flexcan_open(struct net_device *dev)
|
|
{
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
int err;
|
|
|
|
if ((priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) &&
|
|
(priv->can.ctrlmode & CAN_CTRLMODE_FD)) {
|
|
netdev_err(dev, "Three Samples mode and CAN-FD mode can't be used together\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = pm_runtime_get_sync(priv->dev);
|
|
if (err < 0) {
|
|
pm_runtime_put_noidle(priv->dev);
|
|
return err;
|
|
}
|
|
|
|
err = open_candev(dev);
|
|
if (err)
|
|
goto out_runtime_put;
|
|
|
|
err = flexcan_transceiver_enable(priv);
|
|
if (err)
|
|
goto out_close;
|
|
|
|
err = flexcan_rx_offload_setup(dev);
|
|
if (err)
|
|
goto out_transceiver_disable;
|
|
|
|
err = flexcan_chip_start(dev);
|
|
if (err)
|
|
goto out_can_rx_offload_del;
|
|
|
|
can_rx_offload_enable(&priv->offload);
|
|
|
|
err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev);
|
|
if (err)
|
|
goto out_can_rx_offload_disable;
|
|
|
|
flexcan_chip_interrupts_enable(dev);
|
|
|
|
can_led_event(dev, CAN_LED_EVENT_OPEN);
|
|
|
|
netif_start_queue(dev);
|
|
|
|
return 0;
|
|
|
|
out_can_rx_offload_disable:
|
|
can_rx_offload_disable(&priv->offload);
|
|
flexcan_chip_stop(dev);
|
|
out_can_rx_offload_del:
|
|
can_rx_offload_del(&priv->offload);
|
|
out_transceiver_disable:
|
|
flexcan_transceiver_disable(priv);
|
|
out_close:
|
|
close_candev(dev);
|
|
out_runtime_put:
|
|
pm_runtime_put(priv->dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int flexcan_close(struct net_device *dev)
|
|
{
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
|
|
netif_stop_queue(dev);
|
|
flexcan_chip_interrupts_disable(dev);
|
|
free_irq(dev->irq, dev);
|
|
can_rx_offload_disable(&priv->offload);
|
|
flexcan_chip_stop_disable_on_error(dev);
|
|
|
|
can_rx_offload_del(&priv->offload);
|
|
flexcan_transceiver_disable(priv);
|
|
close_candev(dev);
|
|
|
|
pm_runtime_put(priv->dev);
|
|
|
|
can_led_event(dev, CAN_LED_EVENT_STOP);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flexcan_set_mode(struct net_device *dev, enum can_mode mode)
|
|
{
|
|
int err;
|
|
|
|
switch (mode) {
|
|
case CAN_MODE_START:
|
|
err = flexcan_chip_start(dev);
|
|
if (err)
|
|
return err;
|
|
|
|
flexcan_chip_interrupts_enable(dev);
|
|
|
|
netif_wake_queue(dev);
|
|
break;
|
|
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_device_ops flexcan_netdev_ops = {
|
|
.ndo_open = flexcan_open,
|
|
.ndo_stop = flexcan_close,
|
|
.ndo_start_xmit = flexcan_start_xmit,
|
|
.ndo_change_mtu = can_change_mtu,
|
|
};
|
|
|
|
static int register_flexcandev(struct net_device *dev)
|
|
{
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
u32 reg, err;
|
|
|
|
err = flexcan_clks_enable(priv);
|
|
if (err)
|
|
return err;
|
|
|
|
/* select "bus clock", chip must be disabled */
|
|
err = flexcan_chip_disable(priv);
|
|
if (err)
|
|
goto out_clks_disable;
|
|
|
|
reg = priv->read(®s->ctrl);
|
|
if (priv->clk_src)
|
|
reg |= FLEXCAN_CTRL_CLK_SRC;
|
|
else
|
|
reg &= ~FLEXCAN_CTRL_CLK_SRC;
|
|
priv->write(reg, ®s->ctrl);
|
|
|
|
err = flexcan_chip_enable(priv);
|
|
if (err)
|
|
goto out_chip_disable;
|
|
|
|
/* set freeze, halt */
|
|
err = flexcan_chip_freeze(priv);
|
|
if (err)
|
|
goto out_chip_disable;
|
|
|
|
/* activate FIFO, restrict register access */
|
|
reg = priv->read(®s->mcr);
|
|
reg |= FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV;
|
|
priv->write(reg, ®s->mcr);
|
|
|
|
/* Currently we only support newer versions of this core
|
|
* featuring a RX hardware FIFO (although this driver doesn't
|
|
* make use of it on some cores). Older cores, found on some
|
|
* Coldfire derivates are not tested.
|
|
*/
|
|
reg = priv->read(®s->mcr);
|
|
if (!(reg & FLEXCAN_MCR_FEN)) {
|
|
netdev_err(dev, "Could not enable RX FIFO, unsupported core\n");
|
|
err = -ENODEV;
|
|
goto out_chip_disable;
|
|
}
|
|
|
|
err = register_candev(dev);
|
|
if (err)
|
|
goto out_chip_disable;
|
|
|
|
/* Disable core and let pm_runtime_put() disable the clocks.
|
|
* If CONFIG_PM is not enabled, the clocks will stay powered.
|
|
*/
|
|
flexcan_chip_disable(priv);
|
|
pm_runtime_put(priv->dev);
|
|
|
|
return 0;
|
|
|
|
out_chip_disable:
|
|
flexcan_chip_disable(priv);
|
|
out_clks_disable:
|
|
flexcan_clks_disable(priv);
|
|
return err;
|
|
}
|
|
|
|
static void unregister_flexcandev(struct net_device *dev)
|
|
{
|
|
unregister_candev(dev);
|
|
}
|
|
|
|
static int flexcan_setup_stop_mode_gpr(struct platform_device *pdev)
|
|
{
|
|
struct net_device *dev = platform_get_drvdata(pdev);
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct device_node *gpr_np;
|
|
struct flexcan_priv *priv;
|
|
phandle phandle;
|
|
u32 out_val[3];
|
|
int ret;
|
|
|
|
if (!np)
|
|
return -EINVAL;
|
|
|
|
/* stop mode property format is:
|
|
* <&gpr req_gpr req_bit>.
|
|
*/
|
|
ret = of_property_read_u32_array(np, "fsl,stop-mode", out_val,
|
|
ARRAY_SIZE(out_val));
|
|
if (ret) {
|
|
dev_dbg(&pdev->dev, "no stop-mode property\n");
|
|
return ret;
|
|
}
|
|
phandle = *out_val;
|
|
|
|
gpr_np = of_find_node_by_phandle(phandle);
|
|
if (!gpr_np) {
|
|
dev_dbg(&pdev->dev, "could not find gpr node by phandle\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
priv = netdev_priv(dev);
|
|
priv->stm.gpr = syscon_node_to_regmap(gpr_np);
|
|
if (IS_ERR(priv->stm.gpr)) {
|
|
dev_dbg(&pdev->dev, "could not find gpr regmap\n");
|
|
ret = PTR_ERR(priv->stm.gpr);
|
|
goto out_put_node;
|
|
}
|
|
|
|
priv->stm.req_gpr = out_val[1];
|
|
priv->stm.req_bit = out_val[2];
|
|
|
|
dev_dbg(&pdev->dev,
|
|
"gpr %s req_gpr=0x02%x req_bit=%u\n",
|
|
gpr_np->full_name, priv->stm.req_gpr, priv->stm.req_bit);
|
|
|
|
return 0;
|
|
|
|
out_put_node:
|
|
of_node_put(gpr_np);
|
|
return ret;
|
|
}
|
|
|
|
static int flexcan_setup_stop_mode_scfw(struct platform_device *pdev)
|
|
{
|
|
struct net_device *dev = platform_get_drvdata(pdev);
|
|
struct flexcan_priv *priv;
|
|
u8 scu_idx;
|
|
int ret;
|
|
|
|
ret = of_property_read_u8(pdev->dev.of_node, "fsl,scu-index", &scu_idx);
|
|
if (ret < 0) {
|
|
dev_dbg(&pdev->dev, "failed to get scu index\n");
|
|
return ret;
|
|
}
|
|
|
|
priv = netdev_priv(dev);
|
|
priv->scu_idx = scu_idx;
|
|
|
|
/* this function could be deferred probe, return -EPROBE_DEFER */
|
|
return imx_scu_get_handle(&priv->sc_ipc_handle);
|
|
}
|
|
|
|
/* flexcan_setup_stop_mode - Setup stop mode for wakeup
|
|
*
|
|
* Return: = 0 setup stop mode successfully or doesn't support this feature
|
|
* < 0 fail to setup stop mode (could be deferred probe)
|
|
*/
|
|
static int flexcan_setup_stop_mode(struct platform_device *pdev)
|
|
{
|
|
struct net_device *dev = platform_get_drvdata(pdev);
|
|
struct flexcan_priv *priv;
|
|
int ret;
|
|
|
|
priv = netdev_priv(dev);
|
|
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW)
|
|
ret = flexcan_setup_stop_mode_scfw(pdev);
|
|
else if (priv->devtype_data->quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR)
|
|
ret = flexcan_setup_stop_mode_gpr(pdev);
|
|
else
|
|
/* return 0 directly if doesn't support stop mode feature */
|
|
return 0;
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
device_set_wakeup_capable(&pdev->dev, true);
|
|
|
|
if (of_property_read_bool(pdev->dev.of_node, "wakeup-source"))
|
|
device_set_wakeup_enable(&pdev->dev, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id flexcan_of_match[] = {
|
|
{ .compatible = "fsl,imx8qm-flexcan", .data = &fsl_imx8qm_devtype_data, },
|
|
{ .compatible = "fsl,imx8mp-flexcan", .data = &fsl_imx8mp_devtype_data, },
|
|
{ .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, },
|
|
{ .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, },
|
|
{ .compatible = "fsl,imx53-flexcan", .data = &fsl_imx25_devtype_data, },
|
|
{ .compatible = "fsl,imx35-flexcan", .data = &fsl_imx25_devtype_data, },
|
|
{ .compatible = "fsl,imx25-flexcan", .data = &fsl_imx25_devtype_data, },
|
|
{ .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, },
|
|
{ .compatible = "fsl,vf610-flexcan", .data = &fsl_vf610_devtype_data, },
|
|
{ .compatible = "fsl,ls1021ar2-flexcan", .data = &fsl_ls1021a_r2_devtype_data, },
|
|
{ .compatible = "fsl,lx2160ar1-flexcan", .data = &fsl_lx2160a_r1_devtype_data, },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, flexcan_of_match);
|
|
|
|
static int flexcan_probe(struct platform_device *pdev)
|
|
{
|
|
const struct flexcan_devtype_data *devtype_data;
|
|
struct net_device *dev;
|
|
struct flexcan_priv *priv;
|
|
struct regulator *reg_xceiver;
|
|
struct clk *clk_ipg = NULL, *clk_per = NULL;
|
|
struct flexcan_regs __iomem *regs;
|
|
int err, irq;
|
|
u8 clk_src = 1;
|
|
u32 clock_freq = 0;
|
|
|
|
reg_xceiver = devm_regulator_get_optional(&pdev->dev, "xceiver");
|
|
if (PTR_ERR(reg_xceiver) == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
else if (PTR_ERR(reg_xceiver) == -ENODEV)
|
|
reg_xceiver = NULL;
|
|
else if (IS_ERR(reg_xceiver))
|
|
return PTR_ERR(reg_xceiver);
|
|
|
|
if (pdev->dev.of_node) {
|
|
of_property_read_u32(pdev->dev.of_node,
|
|
"clock-frequency", &clock_freq);
|
|
of_property_read_u8(pdev->dev.of_node,
|
|
"fsl,clk-source", &clk_src);
|
|
}
|
|
|
|
if (!clock_freq) {
|
|
clk_ipg = devm_clk_get(&pdev->dev, "ipg");
|
|
if (IS_ERR(clk_ipg)) {
|
|
dev_err(&pdev->dev, "no ipg clock defined\n");
|
|
return PTR_ERR(clk_ipg);
|
|
}
|
|
|
|
clk_per = devm_clk_get(&pdev->dev, "per");
|
|
if (IS_ERR(clk_per)) {
|
|
dev_err(&pdev->dev, "no per clock defined\n");
|
|
return PTR_ERR(clk_per);
|
|
}
|
|
clock_freq = clk_get_rate(clk_per);
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq <= 0)
|
|
return -ENODEV;
|
|
|
|
regs = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(regs))
|
|
return PTR_ERR(regs);
|
|
|
|
devtype_data = of_device_get_match_data(&pdev->dev);
|
|
|
|
if ((devtype_data->quirks & FLEXCAN_QUIRK_SUPPORT_FD) &&
|
|
!(devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP)) {
|
|
dev_err(&pdev->dev, "CAN-FD mode doesn't work with FIFO mode!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev = alloc_candev(sizeof(struct flexcan_priv), 1);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, dev);
|
|
SET_NETDEV_DEV(dev, &pdev->dev);
|
|
|
|
dev->netdev_ops = &flexcan_netdev_ops;
|
|
dev->irq = irq;
|
|
dev->flags |= IFF_ECHO;
|
|
|
|
priv = netdev_priv(dev);
|
|
|
|
if (of_property_read_bool(pdev->dev.of_node, "big-endian") ||
|
|
devtype_data->quirks & FLEXCAN_QUIRK_DEFAULT_BIG_ENDIAN) {
|
|
priv->read = flexcan_read_be;
|
|
priv->write = flexcan_write_be;
|
|
} else {
|
|
priv->read = flexcan_read_le;
|
|
priv->write = flexcan_write_le;
|
|
}
|
|
|
|
priv->dev = &pdev->dev;
|
|
priv->can.clock.freq = clock_freq;
|
|
priv->can.do_set_mode = flexcan_set_mode;
|
|
priv->can.do_get_berr_counter = flexcan_get_berr_counter;
|
|
priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
|
|
CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES |
|
|
CAN_CTRLMODE_BERR_REPORTING;
|
|
priv->regs = regs;
|
|
priv->clk_ipg = clk_ipg;
|
|
priv->clk_per = clk_per;
|
|
priv->clk_src = clk_src;
|
|
priv->devtype_data = devtype_data;
|
|
priv->reg_xceiver = reg_xceiver;
|
|
|
|
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_SUPPORT_FD) {
|
|
priv->can.ctrlmode_supported |= CAN_CTRLMODE_FD |
|
|
CAN_CTRLMODE_FD_NON_ISO;
|
|
priv->can.bittiming_const = &flexcan_fd_bittiming_const;
|
|
priv->can.data_bittiming_const =
|
|
&flexcan_fd_data_bittiming_const;
|
|
} else {
|
|
priv->can.bittiming_const = &flexcan_bittiming_const;
|
|
}
|
|
|
|
pm_runtime_get_noresume(&pdev->dev);
|
|
pm_runtime_set_active(&pdev->dev);
|
|
pm_runtime_enable(&pdev->dev);
|
|
|
|
err = register_flexcandev(dev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "registering netdev failed\n");
|
|
goto failed_register;
|
|
}
|
|
|
|
err = flexcan_setup_stop_mode(pdev);
|
|
if (err < 0) {
|
|
if (err != -EPROBE_DEFER)
|
|
dev_err(&pdev->dev, "setup stop mode failed\n");
|
|
goto failed_setup_stop_mode;
|
|
}
|
|
|
|
of_can_transceiver(dev);
|
|
devm_can_led_init(dev);
|
|
|
|
return 0;
|
|
|
|
failed_setup_stop_mode:
|
|
unregister_flexcandev(dev);
|
|
failed_register:
|
|
pm_runtime_put_noidle(&pdev->dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
free_candev(dev);
|
|
return err;
|
|
}
|
|
|
|
static int flexcan_remove(struct platform_device *pdev)
|
|
{
|
|
struct net_device *dev = platform_get_drvdata(pdev);
|
|
|
|
device_set_wakeup_enable(&pdev->dev, false);
|
|
device_set_wakeup_capable(&pdev->dev, false);
|
|
unregister_flexcandev(dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
free_candev(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused flexcan_suspend(struct device *device)
|
|
{
|
|
struct net_device *dev = dev_get_drvdata(device);
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
int err;
|
|
|
|
if (netif_running(dev)) {
|
|
/* if wakeup is enabled, enter stop mode
|
|
* else enter disabled mode.
|
|
*/
|
|
if (device_may_wakeup(device)) {
|
|
enable_irq_wake(dev->irq);
|
|
err = flexcan_enter_stop_mode(priv);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
err = flexcan_chip_stop(dev);
|
|
if (err)
|
|
return err;
|
|
|
|
flexcan_chip_interrupts_disable(dev);
|
|
|
|
err = pinctrl_pm_select_sleep_state(device);
|
|
if (err)
|
|
return err;
|
|
}
|
|
netif_stop_queue(dev);
|
|
netif_device_detach(dev);
|
|
}
|
|
priv->can.state = CAN_STATE_SLEEPING;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused flexcan_resume(struct device *device)
|
|
{
|
|
struct net_device *dev = dev_get_drvdata(device);
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
int err;
|
|
|
|
priv->can.state = CAN_STATE_ERROR_ACTIVE;
|
|
if (netif_running(dev)) {
|
|
netif_device_attach(dev);
|
|
netif_start_queue(dev);
|
|
if (device_may_wakeup(device)) {
|
|
disable_irq_wake(dev->irq);
|
|
err = flexcan_exit_stop_mode(priv);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
err = pinctrl_pm_select_default_state(device);
|
|
if (err)
|
|
return err;
|
|
|
|
err = flexcan_chip_start(dev);
|
|
if (err)
|
|
return err;
|
|
|
|
flexcan_chip_interrupts_enable(dev);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused flexcan_runtime_suspend(struct device *device)
|
|
{
|
|
struct net_device *dev = dev_get_drvdata(device);
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
|
|
flexcan_clks_disable(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused flexcan_runtime_resume(struct device *device)
|
|
{
|
|
struct net_device *dev = dev_get_drvdata(device);
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
|
|
return flexcan_clks_enable(priv);
|
|
}
|
|
|
|
static int __maybe_unused flexcan_noirq_suspend(struct device *device)
|
|
{
|
|
struct net_device *dev = dev_get_drvdata(device);
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
|
|
if (netif_running(dev)) {
|
|
int err;
|
|
|
|
if (device_may_wakeup(device))
|
|
flexcan_enable_wakeup_irq(priv, true);
|
|
|
|
err = pm_runtime_force_suspend(device);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused flexcan_noirq_resume(struct device *device)
|
|
{
|
|
struct net_device *dev = dev_get_drvdata(device);
|
|
struct flexcan_priv *priv = netdev_priv(dev);
|
|
|
|
if (netif_running(dev)) {
|
|
int err;
|
|
|
|
err = pm_runtime_force_resume(device);
|
|
if (err)
|
|
return err;
|
|
|
|
if (device_may_wakeup(device))
|
|
flexcan_enable_wakeup_irq(priv, false);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops flexcan_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(flexcan_suspend, flexcan_resume)
|
|
SET_RUNTIME_PM_OPS(flexcan_runtime_suspend, flexcan_runtime_resume, NULL)
|
|
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(flexcan_noirq_suspend, flexcan_noirq_resume)
|
|
};
|
|
|
|
static struct platform_driver flexcan_driver = {
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.pm = &flexcan_pm_ops,
|
|
.of_match_table = flexcan_of_match,
|
|
},
|
|
.probe = flexcan_probe,
|
|
.remove = flexcan_remove,
|
|
};
|
|
|
|
module_platform_driver(flexcan_driver);
|
|
|
|
MODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, "
|
|
"Marc Kleine-Budde <kernel@pengutronix.de>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("CAN port driver for flexcan based chip");
|