1872 lines
46 KiB
C
1872 lines
46 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// CAN bus driver for Bosch M_CAN controller
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// Copyright (C) 2014 Freescale Semiconductor, Inc.
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// Dong Aisheng <b29396@freescale.com>
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// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
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/* Bosch M_CAN user manual can be obtained from:
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* http://www.bosch-semiconductors.de/media/pdf_1/ipmodules_1/m_can/
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* mcan_users_manual_v302.pdf
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*/
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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/pm_runtime.h>
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#include <linux/iopoll.h>
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#include <linux/can/dev.h>
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#include <linux/pinctrl/consumer.h>
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#include "m_can.h"
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/* registers definition */
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enum m_can_reg {
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M_CAN_CREL = 0x0,
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M_CAN_ENDN = 0x4,
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M_CAN_CUST = 0x8,
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M_CAN_DBTP = 0xc,
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M_CAN_TEST = 0x10,
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M_CAN_RWD = 0x14,
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M_CAN_CCCR = 0x18,
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M_CAN_NBTP = 0x1c,
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M_CAN_TSCC = 0x20,
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M_CAN_TSCV = 0x24,
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M_CAN_TOCC = 0x28,
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M_CAN_TOCV = 0x2c,
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M_CAN_ECR = 0x40,
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M_CAN_PSR = 0x44,
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/* TDCR Register only available for version >=3.1.x */
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M_CAN_TDCR = 0x48,
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M_CAN_IR = 0x50,
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M_CAN_IE = 0x54,
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M_CAN_ILS = 0x58,
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M_CAN_ILE = 0x5c,
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M_CAN_GFC = 0x80,
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M_CAN_SIDFC = 0x84,
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M_CAN_XIDFC = 0x88,
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M_CAN_XIDAM = 0x90,
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M_CAN_HPMS = 0x94,
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M_CAN_NDAT1 = 0x98,
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M_CAN_NDAT2 = 0x9c,
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M_CAN_RXF0C = 0xa0,
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M_CAN_RXF0S = 0xa4,
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M_CAN_RXF0A = 0xa8,
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M_CAN_RXBC = 0xac,
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M_CAN_RXF1C = 0xb0,
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M_CAN_RXF1S = 0xb4,
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M_CAN_RXF1A = 0xb8,
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M_CAN_RXESC = 0xbc,
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M_CAN_TXBC = 0xc0,
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M_CAN_TXFQS = 0xc4,
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M_CAN_TXESC = 0xc8,
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M_CAN_TXBRP = 0xcc,
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M_CAN_TXBAR = 0xd0,
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M_CAN_TXBCR = 0xd4,
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M_CAN_TXBTO = 0xd8,
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M_CAN_TXBCF = 0xdc,
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M_CAN_TXBTIE = 0xe0,
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M_CAN_TXBCIE = 0xe4,
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M_CAN_TXEFC = 0xf0,
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M_CAN_TXEFS = 0xf4,
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M_CAN_TXEFA = 0xf8,
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};
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/* napi related */
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#define M_CAN_NAPI_WEIGHT 64
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/* message ram configuration data length */
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#define MRAM_CFG_LEN 8
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/* Core Release Register (CREL) */
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#define CREL_REL_SHIFT 28
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#define CREL_REL_MASK (0xF << CREL_REL_SHIFT)
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#define CREL_STEP_SHIFT 24
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#define CREL_STEP_MASK (0xF << CREL_STEP_SHIFT)
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#define CREL_SUBSTEP_SHIFT 20
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#define CREL_SUBSTEP_MASK (0xF << CREL_SUBSTEP_SHIFT)
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/* Data Bit Timing & Prescaler Register (DBTP) */
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#define DBTP_TDC BIT(23)
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#define DBTP_DBRP_SHIFT 16
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#define DBTP_DBRP_MASK (0x1f << DBTP_DBRP_SHIFT)
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#define DBTP_DTSEG1_SHIFT 8
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#define DBTP_DTSEG1_MASK (0x1f << DBTP_DTSEG1_SHIFT)
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#define DBTP_DTSEG2_SHIFT 4
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#define DBTP_DTSEG2_MASK (0xf << DBTP_DTSEG2_SHIFT)
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#define DBTP_DSJW_SHIFT 0
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#define DBTP_DSJW_MASK (0xf << DBTP_DSJW_SHIFT)
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/* Transmitter Delay Compensation Register (TDCR) */
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#define TDCR_TDCO_SHIFT 8
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#define TDCR_TDCO_MASK (0x7F << TDCR_TDCO_SHIFT)
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#define TDCR_TDCF_SHIFT 0
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#define TDCR_TDCF_MASK (0x7F << TDCR_TDCF_SHIFT)
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/* Test Register (TEST) */
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#define TEST_LBCK BIT(4)
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/* CC Control Register(CCCR) */
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#define CCCR_CMR_MASK 0x3
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#define CCCR_CMR_SHIFT 10
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#define CCCR_CMR_CANFD 0x1
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#define CCCR_CMR_CANFD_BRS 0x2
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#define CCCR_CMR_CAN 0x3
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#define CCCR_CME_MASK 0x3
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#define CCCR_CME_SHIFT 8
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#define CCCR_CME_CAN 0
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#define CCCR_CME_CANFD 0x1
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#define CCCR_CME_CANFD_BRS 0x2
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#define CCCR_TXP BIT(14)
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#define CCCR_TEST BIT(7)
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#define CCCR_MON BIT(5)
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#define CCCR_CSR BIT(4)
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#define CCCR_CSA BIT(3)
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#define CCCR_ASM BIT(2)
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#define CCCR_CCE BIT(1)
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#define CCCR_INIT BIT(0)
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#define CCCR_CANFD 0x10
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/* for version >=3.1.x */
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#define CCCR_EFBI BIT(13)
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#define CCCR_PXHD BIT(12)
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#define CCCR_BRSE BIT(9)
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#define CCCR_FDOE BIT(8)
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/* only for version >=3.2.x */
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#define CCCR_NISO BIT(15)
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/* Nominal Bit Timing & Prescaler Register (NBTP) */
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#define NBTP_NSJW_SHIFT 25
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#define NBTP_NSJW_MASK (0x7f << NBTP_NSJW_SHIFT)
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#define NBTP_NBRP_SHIFT 16
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#define NBTP_NBRP_MASK (0x1ff << NBTP_NBRP_SHIFT)
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#define NBTP_NTSEG1_SHIFT 8
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#define NBTP_NTSEG1_MASK (0xff << NBTP_NTSEG1_SHIFT)
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#define NBTP_NTSEG2_SHIFT 0
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#define NBTP_NTSEG2_MASK (0x7f << NBTP_NTSEG2_SHIFT)
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/* Error Counter Register(ECR) */
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#define ECR_RP BIT(15)
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#define ECR_REC_SHIFT 8
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#define ECR_REC_MASK (0x7f << ECR_REC_SHIFT)
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#define ECR_TEC_SHIFT 0
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#define ECR_TEC_MASK 0xff
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/* Protocol Status Register(PSR) */
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#define PSR_BO BIT(7)
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#define PSR_EW BIT(6)
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#define PSR_EP BIT(5)
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#define PSR_LEC_MASK 0x7
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/* Interrupt Register(IR) */
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#define IR_ALL_INT 0xffffffff
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/* Renamed bits for versions > 3.1.x */
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#define IR_ARA BIT(29)
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#define IR_PED BIT(28)
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#define IR_PEA BIT(27)
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/* Bits for version 3.0.x */
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#define IR_STE BIT(31)
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#define IR_FOE BIT(30)
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#define IR_ACKE BIT(29)
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#define IR_BE BIT(28)
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#define IR_CRCE BIT(27)
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#define IR_WDI BIT(26)
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#define IR_BO BIT(25)
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#define IR_EW BIT(24)
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#define IR_EP BIT(23)
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#define IR_ELO BIT(22)
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#define IR_BEU BIT(21)
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#define IR_BEC BIT(20)
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#define IR_DRX BIT(19)
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#define IR_TOO BIT(18)
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#define IR_MRAF BIT(17)
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#define IR_TSW BIT(16)
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#define IR_TEFL BIT(15)
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#define IR_TEFF BIT(14)
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#define IR_TEFW BIT(13)
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#define IR_TEFN BIT(12)
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#define IR_TFE BIT(11)
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#define IR_TCF BIT(10)
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#define IR_TC BIT(9)
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#define IR_HPM BIT(8)
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#define IR_RF1L BIT(7)
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#define IR_RF1F BIT(6)
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#define IR_RF1W BIT(5)
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#define IR_RF1N BIT(4)
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#define IR_RF0L BIT(3)
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#define IR_RF0F BIT(2)
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#define IR_RF0W BIT(1)
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#define IR_RF0N BIT(0)
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#define IR_ERR_STATE (IR_BO | IR_EW | IR_EP)
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/* Interrupts for version 3.0.x */
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#define IR_ERR_LEC_30X (IR_STE | IR_FOE | IR_ACKE | IR_BE | IR_CRCE)
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#define IR_ERR_BUS_30X (IR_ERR_LEC_30X | IR_WDI | IR_ELO | IR_BEU | \
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IR_BEC | IR_TOO | IR_MRAF | IR_TSW | IR_TEFL | \
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IR_RF1L | IR_RF0L)
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#define IR_ERR_ALL_30X (IR_ERR_STATE | IR_ERR_BUS_30X)
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/* Interrupts for version >= 3.1.x */
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#define IR_ERR_LEC_31X (IR_PED | IR_PEA)
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#define IR_ERR_BUS_31X (IR_ERR_LEC_31X | IR_WDI | IR_ELO | IR_BEU | \
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IR_BEC | IR_TOO | IR_MRAF | IR_TSW | IR_TEFL | \
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IR_RF1L | IR_RF0L)
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#define IR_ERR_ALL_31X (IR_ERR_STATE | IR_ERR_BUS_31X)
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/* Interrupt Line Select (ILS) */
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#define ILS_ALL_INT0 0x0
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#define ILS_ALL_INT1 0xFFFFFFFF
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/* Interrupt Line Enable (ILE) */
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#define ILE_EINT1 BIT(1)
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#define ILE_EINT0 BIT(0)
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/* Rx FIFO 0/1 Configuration (RXF0C/RXF1C) */
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#define RXFC_FWM_SHIFT 24
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#define RXFC_FWM_MASK (0x7f << RXFC_FWM_SHIFT)
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#define RXFC_FS_SHIFT 16
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#define RXFC_FS_MASK (0x7f << RXFC_FS_SHIFT)
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/* Rx FIFO 0/1 Status (RXF0S/RXF1S) */
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#define RXFS_RFL BIT(25)
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#define RXFS_FF BIT(24)
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#define RXFS_FPI_SHIFT 16
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#define RXFS_FPI_MASK 0x3f0000
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#define RXFS_FGI_SHIFT 8
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#define RXFS_FGI_MASK 0x3f00
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#define RXFS_FFL_MASK 0x7f
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/* Rx Buffer / FIFO Element Size Configuration (RXESC) */
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#define M_CAN_RXESC_8BYTES 0x0
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#define M_CAN_RXESC_64BYTES 0x777
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/* Tx Buffer Configuration(TXBC) */
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#define TXBC_NDTB_SHIFT 16
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#define TXBC_NDTB_MASK (0x3f << TXBC_NDTB_SHIFT)
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#define TXBC_TFQS_SHIFT 24
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#define TXBC_TFQS_MASK (0x3f << TXBC_TFQS_SHIFT)
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/* Tx FIFO/Queue Status (TXFQS) */
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#define TXFQS_TFQF BIT(21)
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#define TXFQS_TFQPI_SHIFT 16
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#define TXFQS_TFQPI_MASK (0x1f << TXFQS_TFQPI_SHIFT)
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#define TXFQS_TFGI_SHIFT 8
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#define TXFQS_TFGI_MASK (0x1f << TXFQS_TFGI_SHIFT)
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#define TXFQS_TFFL_SHIFT 0
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#define TXFQS_TFFL_MASK (0x3f << TXFQS_TFFL_SHIFT)
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/* Tx Buffer Element Size Configuration(TXESC) */
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#define TXESC_TBDS_8BYTES 0x0
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#define TXESC_TBDS_64BYTES 0x7
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/* Tx Event FIFO Configuration (TXEFC) */
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#define TXEFC_EFS_SHIFT 16
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#define TXEFC_EFS_MASK (0x3f << TXEFC_EFS_SHIFT)
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/* Tx Event FIFO Status (TXEFS) */
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#define TXEFS_TEFL BIT(25)
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#define TXEFS_EFF BIT(24)
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#define TXEFS_EFGI_SHIFT 8
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#define TXEFS_EFGI_MASK (0x1f << TXEFS_EFGI_SHIFT)
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#define TXEFS_EFFL_SHIFT 0
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#define TXEFS_EFFL_MASK (0x3f << TXEFS_EFFL_SHIFT)
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/* Tx Event FIFO Acknowledge (TXEFA) */
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#define TXEFA_EFAI_SHIFT 0
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#define TXEFA_EFAI_MASK (0x1f << TXEFA_EFAI_SHIFT)
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/* Message RAM Configuration (in bytes) */
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#define SIDF_ELEMENT_SIZE 4
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#define XIDF_ELEMENT_SIZE 8
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#define RXF0_ELEMENT_SIZE 72
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#define RXF1_ELEMENT_SIZE 72
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#define RXB_ELEMENT_SIZE 72
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#define TXE_ELEMENT_SIZE 8
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#define TXB_ELEMENT_SIZE 72
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/* Message RAM Elements */
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#define M_CAN_FIFO_ID 0x0
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#define M_CAN_FIFO_DLC 0x4
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#define M_CAN_FIFO_DATA(n) (0x8 + ((n) << 2))
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/* Rx Buffer Element */
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/* R0 */
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#define RX_BUF_ESI BIT(31)
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#define RX_BUF_XTD BIT(30)
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#define RX_BUF_RTR BIT(29)
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/* R1 */
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#define RX_BUF_ANMF BIT(31)
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#define RX_BUF_FDF BIT(21)
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#define RX_BUF_BRS BIT(20)
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/* Tx Buffer Element */
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/* T0 */
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#define TX_BUF_ESI BIT(31)
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#define TX_BUF_XTD BIT(30)
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#define TX_BUF_RTR BIT(29)
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/* T1 */
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#define TX_BUF_EFC BIT(23)
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#define TX_BUF_FDF BIT(21)
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#define TX_BUF_BRS BIT(20)
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#define TX_BUF_MM_SHIFT 24
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#define TX_BUF_MM_MASK (0xff << TX_BUF_MM_SHIFT)
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/* Tx event FIFO Element */
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/* E1 */
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#define TX_EVENT_MM_SHIFT TX_BUF_MM_SHIFT
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#define TX_EVENT_MM_MASK (0xff << TX_EVENT_MM_SHIFT)
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static inline u32 m_can_read(struct m_can_classdev *cdev, enum m_can_reg reg)
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{
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return cdev->ops->read_reg(cdev, reg);
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}
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static inline void m_can_write(struct m_can_classdev *cdev, enum m_can_reg reg,
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u32 val)
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{
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cdev->ops->write_reg(cdev, reg, val);
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}
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static u32 m_can_fifo_read(struct m_can_classdev *cdev,
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u32 fgi, unsigned int offset)
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{
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u32 addr_offset = cdev->mcfg[MRAM_RXF0].off + fgi * RXF0_ELEMENT_SIZE +
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offset;
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return cdev->ops->read_fifo(cdev, addr_offset);
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}
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static void m_can_fifo_write(struct m_can_classdev *cdev,
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u32 fpi, unsigned int offset, u32 val)
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{
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u32 addr_offset = cdev->mcfg[MRAM_TXB].off + fpi * TXB_ELEMENT_SIZE +
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offset;
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cdev->ops->write_fifo(cdev, addr_offset, val);
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}
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static inline void m_can_fifo_write_no_off(struct m_can_classdev *cdev,
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u32 fpi, u32 val)
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{
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cdev->ops->write_fifo(cdev, fpi, val);
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}
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static u32 m_can_txe_fifo_read(struct m_can_classdev *cdev, u32 fgi, u32 offset)
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{
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u32 addr_offset = cdev->mcfg[MRAM_TXE].off + fgi * TXE_ELEMENT_SIZE +
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offset;
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return cdev->ops->read_fifo(cdev, addr_offset);
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}
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static inline bool m_can_tx_fifo_full(struct m_can_classdev *cdev)
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{
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return !!(m_can_read(cdev, M_CAN_TXFQS) & TXFQS_TFQF);
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}
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void m_can_config_endisable(struct m_can_classdev *cdev, bool enable)
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{
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u32 cccr = m_can_read(cdev, M_CAN_CCCR);
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u32 timeout = 10;
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u32 val = 0;
|
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|
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/* Clear the Clock stop request if it was set */
|
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if (cccr & CCCR_CSR)
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cccr &= ~CCCR_CSR;
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if (enable) {
|
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/* Clear the Clock stop request if it was set */
|
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if (cccr & CCCR_CSR)
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cccr &= ~CCCR_CSR;
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/* enable m_can configuration */
|
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m_can_write(cdev, M_CAN_CCCR, cccr | CCCR_INIT);
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udelay(5);
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/* CCCR.CCE can only be set/reset while CCCR.INIT = '1' */
|
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m_can_write(cdev, M_CAN_CCCR, cccr | CCCR_INIT | CCCR_CCE);
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} else {
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m_can_write(cdev, M_CAN_CCCR, cccr & ~(CCCR_INIT | CCCR_CCE));
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}
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/* there's a delay for module initialization */
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if (enable)
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val = CCCR_INIT | CCCR_CCE;
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while ((m_can_read(cdev, M_CAN_CCCR) & (CCCR_INIT | CCCR_CCE)) != val) {
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if (timeout == 0) {
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netdev_warn(cdev->net, "Failed to init module\n");
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return;
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}
|
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timeout--;
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udelay(1);
|
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}
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}
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static inline void m_can_enable_all_interrupts(struct m_can_classdev *cdev)
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{
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/* Only interrupt line 0 is used in this driver */
|
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m_can_write(cdev, M_CAN_ILE, ILE_EINT0);
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}
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static inline void m_can_disable_all_interrupts(struct m_can_classdev *cdev)
|
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{
|
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m_can_write(cdev, M_CAN_ILE, 0x0);
|
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}
|
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|
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static void m_can_clean(struct net_device *net)
|
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{
|
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struct m_can_classdev *cdev = netdev_priv(net);
|
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|
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if (cdev->tx_skb) {
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int putidx = 0;
|
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|
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net->stats.tx_errors++;
|
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if (cdev->version > 30)
|
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putidx = ((m_can_read(cdev, M_CAN_TXFQS) &
|
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TXFQS_TFQPI_MASK) >> TXFQS_TFQPI_SHIFT);
|
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|
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can_free_echo_skb(cdev->net, putidx);
|
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cdev->tx_skb = NULL;
|
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}
|
||
}
|
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|
||
static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
|
||
{
|
||
struct net_device_stats *stats = &dev->stats;
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
struct canfd_frame *cf;
|
||
struct sk_buff *skb;
|
||
u32 id, fgi, dlc;
|
||
int i;
|
||
|
||
/* calculate the fifo get index for where to read data */
|
||
fgi = (rxfs & RXFS_FGI_MASK) >> RXFS_FGI_SHIFT;
|
||
dlc = m_can_fifo_read(cdev, fgi, M_CAN_FIFO_DLC);
|
||
if (dlc & RX_BUF_FDF)
|
||
skb = alloc_canfd_skb(dev, &cf);
|
||
else
|
||
skb = alloc_can_skb(dev, (struct can_frame **)&cf);
|
||
if (!skb) {
|
||
stats->rx_dropped++;
|
||
return;
|
||
}
|
||
|
||
if (dlc & RX_BUF_FDF)
|
||
cf->len = can_dlc2len((dlc >> 16) & 0x0F);
|
||
else
|
||
cf->len = get_can_dlc((dlc >> 16) & 0x0F);
|
||
|
||
id = m_can_fifo_read(cdev, fgi, M_CAN_FIFO_ID);
|
||
if (id & RX_BUF_XTD)
|
||
cf->can_id = (id & CAN_EFF_MASK) | CAN_EFF_FLAG;
|
||
else
|
||
cf->can_id = (id >> 18) & CAN_SFF_MASK;
|
||
|
||
if (id & RX_BUF_ESI) {
|
||
cf->flags |= CANFD_ESI;
|
||
netdev_dbg(dev, "ESI Error\n");
|
||
}
|
||
|
||
if (!(dlc & RX_BUF_FDF) && (id & RX_BUF_RTR)) {
|
||
cf->can_id |= CAN_RTR_FLAG;
|
||
} else {
|
||
if (dlc & RX_BUF_BRS)
|
||
cf->flags |= CANFD_BRS;
|
||
|
||
for (i = 0; i < cf->len; i += 4)
|
||
*(u32 *)(cf->data + i) =
|
||
m_can_fifo_read(cdev, fgi,
|
||
M_CAN_FIFO_DATA(i / 4));
|
||
}
|
||
|
||
/* acknowledge rx fifo 0 */
|
||
m_can_write(cdev, M_CAN_RXF0A, fgi);
|
||
|
||
stats->rx_packets++;
|
||
stats->rx_bytes += cf->len;
|
||
|
||
netif_receive_skb(skb);
|
||
}
|
||
|
||
static int m_can_do_rx_poll(struct net_device *dev, int quota)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
u32 pkts = 0;
|
||
u32 rxfs;
|
||
|
||
rxfs = m_can_read(cdev, M_CAN_RXF0S);
|
||
if (!(rxfs & RXFS_FFL_MASK)) {
|
||
netdev_dbg(dev, "no messages in fifo0\n");
|
||
return 0;
|
||
}
|
||
|
||
while ((rxfs & RXFS_FFL_MASK) && (quota > 0)) {
|
||
if (rxfs & RXFS_RFL)
|
||
netdev_warn(dev, "Rx FIFO 0 Message Lost\n");
|
||
|
||
m_can_read_fifo(dev, rxfs);
|
||
|
||
quota--;
|
||
pkts++;
|
||
rxfs = m_can_read(cdev, M_CAN_RXF0S);
|
||
}
|
||
|
||
if (pkts)
|
||
can_led_event(dev, CAN_LED_EVENT_RX);
|
||
|
||
return pkts;
|
||
}
|
||
|
||
static int m_can_handle_lost_msg(struct net_device *dev)
|
||
{
|
||
struct net_device_stats *stats = &dev->stats;
|
||
struct sk_buff *skb;
|
||
struct can_frame *frame;
|
||
|
||
netdev_err(dev, "msg lost in rxf0\n");
|
||
|
||
stats->rx_errors++;
|
||
stats->rx_over_errors++;
|
||
|
||
skb = alloc_can_err_skb(dev, &frame);
|
||
if (unlikely(!skb))
|
||
return 0;
|
||
|
||
frame->can_id |= CAN_ERR_CRTL;
|
||
frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
|
||
|
||
netif_receive_skb(skb);
|
||
|
||
return 1;
|
||
}
|
||
|
||
static int m_can_handle_lec_err(struct net_device *dev,
|
||
enum m_can_lec_type lec_type)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
struct net_device_stats *stats = &dev->stats;
|
||
struct can_frame *cf;
|
||
struct sk_buff *skb;
|
||
|
||
cdev->can.can_stats.bus_error++;
|
||
stats->rx_errors++;
|
||
|
||
/* propagate the error condition to the CAN stack */
|
||
skb = alloc_can_err_skb(dev, &cf);
|
||
if (unlikely(!skb))
|
||
return 0;
|
||
|
||
/* check for 'last error code' which tells us the
|
||
* type of the last error to occur on the CAN bus
|
||
*/
|
||
cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
|
||
|
||
switch (lec_type) {
|
||
case LEC_STUFF_ERROR:
|
||
netdev_dbg(dev, "stuff error\n");
|
||
cf->data[2] |= CAN_ERR_PROT_STUFF;
|
||
break;
|
||
case LEC_FORM_ERROR:
|
||
netdev_dbg(dev, "form error\n");
|
||
cf->data[2] |= CAN_ERR_PROT_FORM;
|
||
break;
|
||
case LEC_ACK_ERROR:
|
||
netdev_dbg(dev, "ack error\n");
|
||
cf->data[3] = CAN_ERR_PROT_LOC_ACK;
|
||
break;
|
||
case LEC_BIT1_ERROR:
|
||
netdev_dbg(dev, "bit1 error\n");
|
||
cf->data[2] |= CAN_ERR_PROT_BIT1;
|
||
break;
|
||
case LEC_BIT0_ERROR:
|
||
netdev_dbg(dev, "bit0 error\n");
|
||
cf->data[2] |= CAN_ERR_PROT_BIT0;
|
||
break;
|
||
case LEC_CRC_ERROR:
|
||
netdev_dbg(dev, "CRC error\n");
|
||
cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
stats->rx_packets++;
|
||
stats->rx_bytes += cf->can_dlc;
|
||
netif_receive_skb(skb);
|
||
|
||
return 1;
|
||
}
|
||
|
||
static int __m_can_get_berr_counter(const struct net_device *dev,
|
||
struct can_berr_counter *bec)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
unsigned int ecr;
|
||
|
||
ecr = m_can_read(cdev, M_CAN_ECR);
|
||
bec->rxerr = (ecr & ECR_REC_MASK) >> ECR_REC_SHIFT;
|
||
bec->txerr = (ecr & ECR_TEC_MASK) >> ECR_TEC_SHIFT;
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int m_can_clk_start(struct m_can_classdev *cdev)
|
||
{
|
||
int err;
|
||
|
||
if (cdev->pm_clock_support == 0)
|
||
return 0;
|
||
|
||
err = pm_runtime_get_sync(cdev->dev);
|
||
if (err < 0) {
|
||
pm_runtime_put_noidle(cdev->dev);
|
||
return err;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void m_can_clk_stop(struct m_can_classdev *cdev)
|
||
{
|
||
if (cdev->pm_clock_support)
|
||
pm_runtime_put_sync(cdev->dev);
|
||
}
|
||
|
||
static int m_can_get_berr_counter(const struct net_device *dev,
|
||
struct can_berr_counter *bec)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
int err;
|
||
|
||
err = m_can_clk_start(cdev);
|
||
if (err)
|
||
return err;
|
||
|
||
__m_can_get_berr_counter(dev, bec);
|
||
|
||
m_can_clk_stop(cdev);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int m_can_handle_state_change(struct net_device *dev,
|
||
enum can_state new_state)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
struct net_device_stats *stats = &dev->stats;
|
||
struct can_frame *cf;
|
||
struct sk_buff *skb;
|
||
struct can_berr_counter bec;
|
||
unsigned int ecr;
|
||
|
||
switch (new_state) {
|
||
case CAN_STATE_ERROR_ACTIVE:
|
||
/* error warning state */
|
||
cdev->can.can_stats.error_warning++;
|
||
cdev->can.state = CAN_STATE_ERROR_WARNING;
|
||
break;
|
||
case CAN_STATE_ERROR_PASSIVE:
|
||
/* error passive state */
|
||
cdev->can.can_stats.error_passive++;
|
||
cdev->can.state = CAN_STATE_ERROR_PASSIVE;
|
||
break;
|
||
case CAN_STATE_BUS_OFF:
|
||
/* bus-off state */
|
||
cdev->can.state = CAN_STATE_BUS_OFF;
|
||
m_can_disable_all_interrupts(cdev);
|
||
cdev->can.can_stats.bus_off++;
|
||
can_bus_off(dev);
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
/* propagate the error condition to the CAN stack */
|
||
skb = alloc_can_err_skb(dev, &cf);
|
||
if (unlikely(!skb))
|
||
return 0;
|
||
|
||
__m_can_get_berr_counter(dev, &bec);
|
||
|
||
switch (new_state) {
|
||
case CAN_STATE_ERROR_ACTIVE:
|
||
/* 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;
|
||
ecr = m_can_read(cdev, M_CAN_ECR);
|
||
if (ecr & ECR_RP)
|
||
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->can_dlc;
|
||
netif_receive_skb(skb);
|
||
|
||
return 1;
|
||
}
|
||
|
||
static int m_can_handle_state_errors(struct net_device *dev, u32 psr)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
int work_done = 0;
|
||
|
||
if (psr & PSR_EW && cdev->can.state != CAN_STATE_ERROR_WARNING) {
|
||
netdev_dbg(dev, "entered error warning state\n");
|
||
work_done += m_can_handle_state_change(dev,
|
||
CAN_STATE_ERROR_WARNING);
|
||
}
|
||
|
||
if (psr & PSR_EP && cdev->can.state != CAN_STATE_ERROR_PASSIVE) {
|
||
netdev_dbg(dev, "entered error passive state\n");
|
||
work_done += m_can_handle_state_change(dev,
|
||
CAN_STATE_ERROR_PASSIVE);
|
||
}
|
||
|
||
if (psr & PSR_BO && cdev->can.state != CAN_STATE_BUS_OFF) {
|
||
netdev_dbg(dev, "entered error bus off state\n");
|
||
work_done += m_can_handle_state_change(dev,
|
||
CAN_STATE_BUS_OFF);
|
||
}
|
||
|
||
return work_done;
|
||
}
|
||
|
||
static void m_can_handle_other_err(struct net_device *dev, u32 irqstatus)
|
||
{
|
||
if (irqstatus & IR_WDI)
|
||
netdev_err(dev, "Message RAM Watchdog event due to missing READY\n");
|
||
if (irqstatus & IR_ELO)
|
||
netdev_err(dev, "Error Logging Overflow\n");
|
||
if (irqstatus & IR_BEU)
|
||
netdev_err(dev, "Bit Error Uncorrected\n");
|
||
if (irqstatus & IR_BEC)
|
||
netdev_err(dev, "Bit Error Corrected\n");
|
||
if (irqstatus & IR_TOO)
|
||
netdev_err(dev, "Timeout reached\n");
|
||
if (irqstatus & IR_MRAF)
|
||
netdev_err(dev, "Message RAM access failure occurred\n");
|
||
}
|
||
|
||
static inline bool is_lec_err(u32 psr)
|
||
{
|
||
psr &= LEC_UNUSED;
|
||
|
||
return psr && (psr != LEC_UNUSED);
|
||
}
|
||
|
||
static int m_can_handle_bus_errors(struct net_device *dev, u32 irqstatus,
|
||
u32 psr)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
int work_done = 0;
|
||
|
||
if (irqstatus & IR_RF0L)
|
||
work_done += m_can_handle_lost_msg(dev);
|
||
|
||
/* handle lec errors on the bus */
|
||
if ((cdev->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) &&
|
||
is_lec_err(psr))
|
||
work_done += m_can_handle_lec_err(dev, psr & LEC_UNUSED);
|
||
|
||
/* other unproccessed error interrupts */
|
||
m_can_handle_other_err(dev, irqstatus);
|
||
|
||
return work_done;
|
||
}
|
||
|
||
static int m_can_rx_handler(struct net_device *dev, int quota)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
int work_done = 0;
|
||
u32 irqstatus, psr;
|
||
|
||
irqstatus = cdev->irqstatus | m_can_read(cdev, M_CAN_IR);
|
||
if (!irqstatus)
|
||
goto end;
|
||
|
||
/* Errata workaround for issue "Needless activation of MRAF irq"
|
||
* During frame reception while the MCAN is in Error Passive state
|
||
* and the Receive Error Counter has the value MCAN_ECR.REC = 127,
|
||
* it may happen that MCAN_IR.MRAF is set although there was no
|
||
* Message RAM access failure.
|
||
* If MCAN_IR.MRAF is enabled, an interrupt to the Host CPU is generated
|
||
* The Message RAM Access Failure interrupt routine needs to check
|
||
* whether MCAN_ECR.RP = ’1’ and MCAN_ECR.REC = 127.
|
||
* In this case, reset MCAN_IR.MRAF. No further action is required.
|
||
*/
|
||
if (cdev->version <= 31 && irqstatus & IR_MRAF &&
|
||
m_can_read(cdev, M_CAN_ECR) & ECR_RP) {
|
||
struct can_berr_counter bec;
|
||
|
||
__m_can_get_berr_counter(dev, &bec);
|
||
if (bec.rxerr == 127) {
|
||
m_can_write(cdev, M_CAN_IR, IR_MRAF);
|
||
irqstatus &= ~IR_MRAF;
|
||
}
|
||
}
|
||
|
||
psr = m_can_read(cdev, M_CAN_PSR);
|
||
|
||
if (irqstatus & IR_ERR_STATE)
|
||
work_done += m_can_handle_state_errors(dev, psr);
|
||
|
||
if (irqstatus & IR_ERR_BUS_30X)
|
||
work_done += m_can_handle_bus_errors(dev, irqstatus, psr);
|
||
|
||
if (irqstatus & IR_RF0N)
|
||
work_done += m_can_do_rx_poll(dev, (quota - work_done));
|
||
end:
|
||
return work_done;
|
||
}
|
||
|
||
static int m_can_rx_peripheral(struct net_device *dev)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
|
||
m_can_rx_handler(dev, 1);
|
||
|
||
m_can_enable_all_interrupts(cdev);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int m_can_poll(struct napi_struct *napi, int quota)
|
||
{
|
||
struct net_device *dev = napi->dev;
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
int work_done;
|
||
|
||
work_done = m_can_rx_handler(dev, quota);
|
||
if (work_done < quota) {
|
||
napi_complete_done(napi, work_done);
|
||
m_can_enable_all_interrupts(cdev);
|
||
}
|
||
|
||
return work_done;
|
||
}
|
||
|
||
static void m_can_echo_tx_event(struct net_device *dev)
|
||
{
|
||
u32 txe_count = 0;
|
||
u32 m_can_txefs;
|
||
u32 fgi = 0;
|
||
int i = 0;
|
||
unsigned int msg_mark;
|
||
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
struct net_device_stats *stats = &dev->stats;
|
||
|
||
/* read tx event fifo status */
|
||
m_can_txefs = m_can_read(cdev, M_CAN_TXEFS);
|
||
|
||
/* Get Tx Event fifo element count */
|
||
txe_count = (m_can_txefs & TXEFS_EFFL_MASK)
|
||
>> TXEFS_EFFL_SHIFT;
|
||
|
||
/* Get and process all sent elements */
|
||
for (i = 0; i < txe_count; i++) {
|
||
/* retrieve get index */
|
||
fgi = (m_can_read(cdev, M_CAN_TXEFS) & TXEFS_EFGI_MASK)
|
||
>> TXEFS_EFGI_SHIFT;
|
||
|
||
/* get message marker */
|
||
msg_mark = (m_can_txe_fifo_read(cdev, fgi, 4) &
|
||
TX_EVENT_MM_MASK) >> TX_EVENT_MM_SHIFT;
|
||
|
||
/* ack txe element */
|
||
m_can_write(cdev, M_CAN_TXEFA, (TXEFA_EFAI_MASK &
|
||
(fgi << TXEFA_EFAI_SHIFT)));
|
||
|
||
/* update stats */
|
||
stats->tx_bytes += can_get_echo_skb(dev, msg_mark);
|
||
stats->tx_packets++;
|
||
}
|
||
}
|
||
|
||
static irqreturn_t m_can_isr(int irq, void *dev_id)
|
||
{
|
||
struct net_device *dev = (struct net_device *)dev_id;
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
struct net_device_stats *stats = &dev->stats;
|
||
u32 ir;
|
||
|
||
ir = m_can_read(cdev, M_CAN_IR);
|
||
if (!ir)
|
||
return IRQ_NONE;
|
||
|
||
/* ACK all irqs */
|
||
if (ir & IR_ALL_INT)
|
||
m_can_write(cdev, M_CAN_IR, ir);
|
||
|
||
if (cdev->ops->clear_interrupts)
|
||
cdev->ops->clear_interrupts(cdev);
|
||
|
||
/* schedule NAPI in case of
|
||
* - rx IRQ
|
||
* - state change IRQ
|
||
* - bus error IRQ and bus error reporting
|
||
*/
|
||
if ((ir & IR_RF0N) || (ir & IR_ERR_ALL_30X)) {
|
||
cdev->irqstatus = ir;
|
||
m_can_disable_all_interrupts(cdev);
|
||
if (!cdev->is_peripheral)
|
||
napi_schedule(&cdev->napi);
|
||
else
|
||
m_can_rx_peripheral(dev);
|
||
}
|
||
|
||
if (cdev->version == 30) {
|
||
if (ir & IR_TC) {
|
||
/* Transmission Complete Interrupt*/
|
||
stats->tx_bytes += can_get_echo_skb(dev, 0);
|
||
stats->tx_packets++;
|
||
can_led_event(dev, CAN_LED_EVENT_TX);
|
||
netif_wake_queue(dev);
|
||
}
|
||
} else {
|
||
if (ir & IR_TEFN) {
|
||
/* New TX FIFO Element arrived */
|
||
m_can_echo_tx_event(dev);
|
||
can_led_event(dev, CAN_LED_EVENT_TX);
|
||
if (netif_queue_stopped(dev) &&
|
||
!m_can_tx_fifo_full(cdev))
|
||
netif_wake_queue(dev);
|
||
}
|
||
}
|
||
|
||
return IRQ_HANDLED;
|
||
}
|
||
|
||
static const struct can_bittiming_const m_can_bittiming_const_30X = {
|
||
.name = KBUILD_MODNAME,
|
||
.tseg1_min = 2, /* Time segment 1 = prop_seg + phase_seg1 */
|
||
.tseg1_max = 64,
|
||
.tseg2_min = 1, /* Time segment 2 = phase_seg2 */
|
||
.tseg2_max = 16,
|
||
.sjw_max = 16,
|
||
.brp_min = 1,
|
||
.brp_max = 1024,
|
||
.brp_inc = 1,
|
||
};
|
||
|
||
static const struct can_bittiming_const m_can_data_bittiming_const_30X = {
|
||
.name = KBUILD_MODNAME,
|
||
.tseg1_min = 2, /* Time segment 1 = prop_seg + phase_seg1 */
|
||
.tseg1_max = 16,
|
||
.tseg2_min = 1, /* Time segment 2 = phase_seg2 */
|
||
.tseg2_max = 8,
|
||
.sjw_max = 4,
|
||
.brp_min = 1,
|
||
.brp_max = 32,
|
||
.brp_inc = 1,
|
||
};
|
||
|
||
static const struct can_bittiming_const m_can_bittiming_const_31X = {
|
||
.name = KBUILD_MODNAME,
|
||
.tseg1_min = 2, /* Time segment 1 = prop_seg + phase_seg1 */
|
||
.tseg1_max = 256,
|
||
.tseg2_min = 1, /* Time segment 2 = phase_seg2 */
|
||
.tseg2_max = 128,
|
||
.sjw_max = 128,
|
||
.brp_min = 1,
|
||
.brp_max = 512,
|
||
.brp_inc = 1,
|
||
};
|
||
|
||
static const struct can_bittiming_const m_can_data_bittiming_const_31X = {
|
||
.name = KBUILD_MODNAME,
|
||
.tseg1_min = 1, /* Time segment 1 = prop_seg + phase_seg1 */
|
||
.tseg1_max = 32,
|
||
.tseg2_min = 1, /* Time segment 2 = phase_seg2 */
|
||
.tseg2_max = 16,
|
||
.sjw_max = 16,
|
||
.brp_min = 1,
|
||
.brp_max = 32,
|
||
.brp_inc = 1,
|
||
};
|
||
|
||
static int m_can_set_bittiming(struct net_device *dev)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
const struct can_bittiming *bt = &cdev->can.bittiming;
|
||
const struct can_bittiming *dbt = &cdev->can.data_bittiming;
|
||
u16 brp, sjw, tseg1, tseg2;
|
||
u32 reg_btp;
|
||
|
||
brp = bt->brp - 1;
|
||
sjw = bt->sjw - 1;
|
||
tseg1 = bt->prop_seg + bt->phase_seg1 - 1;
|
||
tseg2 = bt->phase_seg2 - 1;
|
||
reg_btp = (brp << NBTP_NBRP_SHIFT) | (sjw << NBTP_NSJW_SHIFT) |
|
||
(tseg1 << NBTP_NTSEG1_SHIFT) | (tseg2 << NBTP_NTSEG2_SHIFT);
|
||
m_can_write(cdev, M_CAN_NBTP, reg_btp);
|
||
|
||
if (cdev->can.ctrlmode & CAN_CTRLMODE_FD) {
|
||
reg_btp = 0;
|
||
brp = dbt->brp - 1;
|
||
sjw = dbt->sjw - 1;
|
||
tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1;
|
||
tseg2 = dbt->phase_seg2 - 1;
|
||
|
||
/* TDC is only needed for bitrates beyond 2.5 MBit/s.
|
||
* This is mentioned in the "Bit Time Requirements for CAN FD"
|
||
* paper presented at the International CAN Conference 2013
|
||
*/
|
||
if (dbt->bitrate > 2500000) {
|
||
u32 tdco, ssp;
|
||
|
||
/* Use the same value of secondary sampling point
|
||
* as the data sampling point
|
||
*/
|
||
ssp = dbt->sample_point;
|
||
|
||
/* Equation based on Bosch's M_CAN User Manual's
|
||
* Transmitter Delay Compensation Section
|
||
*/
|
||
tdco = (cdev->can.clock.freq / 1000) *
|
||
ssp / dbt->bitrate;
|
||
|
||
/* Max valid TDCO value is 127 */
|
||
if (tdco > 127) {
|
||
netdev_warn(dev, "TDCO value of %u is beyond maximum. Using maximum possible value\n",
|
||
tdco);
|
||
tdco = 127;
|
||
}
|
||
|
||
reg_btp |= DBTP_TDC;
|
||
m_can_write(cdev, M_CAN_TDCR,
|
||
tdco << TDCR_TDCO_SHIFT);
|
||
}
|
||
|
||
reg_btp |= (brp << DBTP_DBRP_SHIFT) |
|
||
(sjw << DBTP_DSJW_SHIFT) |
|
||
(tseg1 << DBTP_DTSEG1_SHIFT) |
|
||
(tseg2 << DBTP_DTSEG2_SHIFT);
|
||
|
||
m_can_write(cdev, M_CAN_DBTP, reg_btp);
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Configure M_CAN chip:
|
||
* - set rx buffer/fifo element size
|
||
* - configure rx fifo
|
||
* - accept non-matching frame into fifo 0
|
||
* - configure tx buffer
|
||
* - >= v3.1.x: TX FIFO is used
|
||
* - configure mode
|
||
* - setup bittiming
|
||
*/
|
||
static void m_can_chip_config(struct net_device *dev)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
u32 cccr, test;
|
||
|
||
m_can_config_endisable(cdev, true);
|
||
|
||
/* RX Buffer/FIFO Element Size 64 bytes data field */
|
||
m_can_write(cdev, M_CAN_RXESC, M_CAN_RXESC_64BYTES);
|
||
|
||
/* Accept Non-matching Frames Into FIFO 0 */
|
||
m_can_write(cdev, M_CAN_GFC, 0x0);
|
||
|
||
if (cdev->version == 30) {
|
||
/* only support one Tx Buffer currently */
|
||
m_can_write(cdev, M_CAN_TXBC, (1 << TXBC_NDTB_SHIFT) |
|
||
cdev->mcfg[MRAM_TXB].off);
|
||
} else {
|
||
/* TX FIFO is used for newer IP Core versions */
|
||
m_can_write(cdev, M_CAN_TXBC,
|
||
(cdev->mcfg[MRAM_TXB].num << TXBC_TFQS_SHIFT) |
|
||
(cdev->mcfg[MRAM_TXB].off));
|
||
}
|
||
|
||
/* support 64 bytes payload */
|
||
m_can_write(cdev, M_CAN_TXESC, TXESC_TBDS_64BYTES);
|
||
|
||
/* TX Event FIFO */
|
||
if (cdev->version == 30) {
|
||
m_can_write(cdev, M_CAN_TXEFC, (1 << TXEFC_EFS_SHIFT) |
|
||
cdev->mcfg[MRAM_TXE].off);
|
||
} else {
|
||
/* Full TX Event FIFO is used */
|
||
m_can_write(cdev, M_CAN_TXEFC,
|
||
((cdev->mcfg[MRAM_TXE].num << TXEFC_EFS_SHIFT)
|
||
& TXEFC_EFS_MASK) |
|
||
cdev->mcfg[MRAM_TXE].off);
|
||
}
|
||
|
||
/* rx fifo configuration, blocking mode, fifo size 1 */
|
||
m_can_write(cdev, M_CAN_RXF0C,
|
||
(cdev->mcfg[MRAM_RXF0].num << RXFC_FS_SHIFT) |
|
||
cdev->mcfg[MRAM_RXF0].off);
|
||
|
||
m_can_write(cdev, M_CAN_RXF1C,
|
||
(cdev->mcfg[MRAM_RXF1].num << RXFC_FS_SHIFT) |
|
||
cdev->mcfg[MRAM_RXF1].off);
|
||
|
||
cccr = m_can_read(cdev, M_CAN_CCCR);
|
||
test = m_can_read(cdev, M_CAN_TEST);
|
||
test &= ~TEST_LBCK;
|
||
if (cdev->version == 30) {
|
||
/* Version 3.0.x */
|
||
|
||
cccr &= ~(CCCR_TEST | CCCR_MON |
|
||
(CCCR_CMR_MASK << CCCR_CMR_SHIFT) |
|
||
(CCCR_CME_MASK << CCCR_CME_SHIFT));
|
||
|
||
if (cdev->can.ctrlmode & CAN_CTRLMODE_FD)
|
||
cccr |= CCCR_CME_CANFD_BRS << CCCR_CME_SHIFT;
|
||
|
||
} else {
|
||
/* Version 3.1.x or 3.2.x */
|
||
cccr &= ~(CCCR_TEST | CCCR_MON | CCCR_BRSE | CCCR_FDOE |
|
||
CCCR_NISO);
|
||
|
||
/* Only 3.2.x has NISO Bit implemented */
|
||
if (cdev->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
|
||
cccr |= CCCR_NISO;
|
||
|
||
if (cdev->can.ctrlmode & CAN_CTRLMODE_FD)
|
||
cccr |= (CCCR_BRSE | CCCR_FDOE);
|
||
}
|
||
|
||
/* Loopback Mode */
|
||
if (cdev->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
|
||
cccr |= CCCR_TEST | CCCR_MON;
|
||
test |= TEST_LBCK;
|
||
}
|
||
|
||
/* Enable Monitoring (all versions) */
|
||
if (cdev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
|
||
cccr |= CCCR_MON;
|
||
|
||
/* Write config */
|
||
m_can_write(cdev, M_CAN_CCCR, cccr);
|
||
m_can_write(cdev, M_CAN_TEST, test);
|
||
|
||
/* Enable interrupts */
|
||
m_can_write(cdev, M_CAN_IR, IR_ALL_INT);
|
||
if (!(cdev->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING))
|
||
if (cdev->version == 30)
|
||
m_can_write(cdev, M_CAN_IE, IR_ALL_INT &
|
||
~(IR_ERR_LEC_30X));
|
||
else
|
||
m_can_write(cdev, M_CAN_IE, IR_ALL_INT &
|
||
~(IR_ERR_LEC_31X));
|
||
else
|
||
m_can_write(cdev, M_CAN_IE, IR_ALL_INT);
|
||
|
||
/* route all interrupts to INT0 */
|
||
m_can_write(cdev, M_CAN_ILS, ILS_ALL_INT0);
|
||
|
||
/* set bittiming params */
|
||
m_can_set_bittiming(dev);
|
||
|
||
m_can_config_endisable(cdev, false);
|
||
|
||
if (cdev->ops->init)
|
||
cdev->ops->init(cdev);
|
||
}
|
||
|
||
static void m_can_start(struct net_device *dev)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
|
||
/* basic m_can configuration */
|
||
m_can_chip_config(dev);
|
||
|
||
cdev->can.state = CAN_STATE_ERROR_ACTIVE;
|
||
|
||
m_can_enable_all_interrupts(cdev);
|
||
}
|
||
|
||
static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
|
||
{
|
||
switch (mode) {
|
||
case CAN_MODE_START:
|
||
m_can_clean(dev);
|
||
m_can_start(dev);
|
||
netif_wake_queue(dev);
|
||
break;
|
||
default:
|
||
return -EOPNOTSUPP;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Checks core release number of M_CAN
|
||
* returns 0 if an unsupported device is detected
|
||
* else it returns the release and step coded as:
|
||
* return value = 10 * <release> + 1 * <step>
|
||
*/
|
||
static int m_can_check_core_release(struct m_can_classdev *cdev)
|
||
{
|
||
u32 crel_reg;
|
||
u8 rel;
|
||
u8 step;
|
||
int res;
|
||
|
||
/* Read Core Release Version and split into version number
|
||
* Example: Version 3.2.1 => rel = 3; step = 2; substep = 1;
|
||
*/
|
||
crel_reg = m_can_read(cdev, M_CAN_CREL);
|
||
rel = (u8)((crel_reg & CREL_REL_MASK) >> CREL_REL_SHIFT);
|
||
step = (u8)((crel_reg & CREL_STEP_MASK) >> CREL_STEP_SHIFT);
|
||
|
||
if (rel == 3) {
|
||
/* M_CAN v3.x.y: create return value */
|
||
res = 30 + step;
|
||
} else {
|
||
/* Unsupported M_CAN version */
|
||
res = 0;
|
||
}
|
||
|
||
return res;
|
||
}
|
||
|
||
/* Selectable Non ISO support only in version 3.2.x
|
||
* This function checks if the bit is writable.
|
||
*/
|
||
static bool m_can_niso_supported(struct m_can_classdev *cdev)
|
||
{
|
||
u32 cccr_reg, cccr_poll = 0;
|
||
int niso_timeout = -ETIMEDOUT;
|
||
int i;
|
||
|
||
m_can_config_endisable(cdev, true);
|
||
cccr_reg = m_can_read(cdev, M_CAN_CCCR);
|
||
cccr_reg |= CCCR_NISO;
|
||
m_can_write(cdev, M_CAN_CCCR, cccr_reg);
|
||
|
||
for (i = 0; i <= 10; i++) {
|
||
cccr_poll = m_can_read(cdev, M_CAN_CCCR);
|
||
if (cccr_poll == cccr_reg) {
|
||
niso_timeout = 0;
|
||
break;
|
||
}
|
||
|
||
usleep_range(1, 5);
|
||
}
|
||
|
||
/* Clear NISO */
|
||
cccr_reg &= ~(CCCR_NISO);
|
||
m_can_write(cdev, M_CAN_CCCR, cccr_reg);
|
||
|
||
m_can_config_endisable(cdev, false);
|
||
|
||
/* return false if time out (-ETIMEDOUT), else return true */
|
||
return !niso_timeout;
|
||
}
|
||
|
||
static int m_can_dev_setup(struct m_can_classdev *m_can_dev)
|
||
{
|
||
struct net_device *dev = m_can_dev->net;
|
||
int m_can_version;
|
||
|
||
m_can_version = m_can_check_core_release(m_can_dev);
|
||
/* return if unsupported version */
|
||
if (!m_can_version) {
|
||
dev_err(m_can_dev->dev, "Unsupported version number: %2d",
|
||
m_can_version);
|
||
return -EINVAL;
|
||
}
|
||
|
||
if (!m_can_dev->is_peripheral)
|
||
netif_napi_add(dev, &m_can_dev->napi,
|
||
m_can_poll, M_CAN_NAPI_WEIGHT);
|
||
|
||
/* Shared properties of all M_CAN versions */
|
||
m_can_dev->version = m_can_version;
|
||
m_can_dev->can.do_set_mode = m_can_set_mode;
|
||
m_can_dev->can.do_get_berr_counter = m_can_get_berr_counter;
|
||
|
||
/* Set M_CAN supported operations */
|
||
m_can_dev->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
|
||
CAN_CTRLMODE_LISTENONLY |
|
||
CAN_CTRLMODE_BERR_REPORTING |
|
||
CAN_CTRLMODE_FD;
|
||
|
||
/* Set properties depending on M_CAN version */
|
||
switch (m_can_dev->version) {
|
||
case 30:
|
||
/* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.0.x */
|
||
can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
|
||
m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
|
||
m_can_dev->bit_timing : &m_can_bittiming_const_30X;
|
||
|
||
m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
|
||
m_can_dev->data_timing :
|
||
&m_can_data_bittiming_const_30X;
|
||
break;
|
||
case 31:
|
||
/* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.1.x */
|
||
can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
|
||
m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
|
||
m_can_dev->bit_timing : &m_can_bittiming_const_31X;
|
||
|
||
m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
|
||
m_can_dev->data_timing :
|
||
&m_can_data_bittiming_const_31X;
|
||
break;
|
||
case 32:
|
||
m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
|
||
m_can_dev->bit_timing : &m_can_bittiming_const_31X;
|
||
|
||
m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
|
||
m_can_dev->data_timing :
|
||
&m_can_data_bittiming_const_31X;
|
||
|
||
m_can_dev->can.ctrlmode_supported |=
|
||
(m_can_niso_supported(m_can_dev)
|
||
? CAN_CTRLMODE_FD_NON_ISO
|
||
: 0);
|
||
break;
|
||
default:
|
||
dev_err(m_can_dev->dev, "Unsupported version number: %2d",
|
||
m_can_dev->version);
|
||
return -EINVAL;
|
||
}
|
||
|
||
if (m_can_dev->ops->init)
|
||
m_can_dev->ops->init(m_can_dev);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void m_can_stop(struct net_device *dev)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
|
||
/* disable all interrupts */
|
||
m_can_disable_all_interrupts(cdev);
|
||
|
||
/* set the state as STOPPED */
|
||
cdev->can.state = CAN_STATE_STOPPED;
|
||
}
|
||
|
||
static int m_can_close(struct net_device *dev)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
|
||
netif_stop_queue(dev);
|
||
|
||
if (!cdev->is_peripheral)
|
||
napi_disable(&cdev->napi);
|
||
|
||
m_can_stop(dev);
|
||
m_can_clk_stop(cdev);
|
||
free_irq(dev->irq, dev);
|
||
|
||
if (cdev->is_peripheral) {
|
||
cdev->tx_skb = NULL;
|
||
destroy_workqueue(cdev->tx_wq);
|
||
cdev->tx_wq = NULL;
|
||
}
|
||
|
||
close_candev(dev);
|
||
can_led_event(dev, CAN_LED_EVENT_STOP);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int m_can_next_echo_skb_occupied(struct net_device *dev, int putidx)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
/*get wrap around for loopback skb index */
|
||
unsigned int wrap = cdev->can.echo_skb_max;
|
||
int next_idx;
|
||
|
||
/* calculate next index */
|
||
next_idx = (++putidx >= wrap ? 0 : putidx);
|
||
|
||
/* check if occupied */
|
||
return !!cdev->can.echo_skb[next_idx];
|
||
}
|
||
|
||
static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev)
|
||
{
|
||
struct canfd_frame *cf = (struct canfd_frame *)cdev->tx_skb->data;
|
||
struct net_device *dev = cdev->net;
|
||
struct sk_buff *skb = cdev->tx_skb;
|
||
u32 id, cccr, fdflags;
|
||
int i;
|
||
int putidx;
|
||
|
||
/* Generate ID field for TX buffer Element */
|
||
/* Common to all supported M_CAN versions */
|
||
if (cf->can_id & CAN_EFF_FLAG) {
|
||
id = cf->can_id & CAN_EFF_MASK;
|
||
id |= TX_BUF_XTD;
|
||
} else {
|
||
id = ((cf->can_id & CAN_SFF_MASK) << 18);
|
||
}
|
||
|
||
if (cf->can_id & CAN_RTR_FLAG)
|
||
id |= TX_BUF_RTR;
|
||
|
||
if (cdev->version == 30) {
|
||
netif_stop_queue(dev);
|
||
|
||
/* message ram configuration */
|
||
m_can_fifo_write(cdev, 0, M_CAN_FIFO_ID, id);
|
||
m_can_fifo_write(cdev, 0, M_CAN_FIFO_DLC,
|
||
can_len2dlc(cf->len) << 16);
|
||
|
||
for (i = 0; i < cf->len; i += 4)
|
||
m_can_fifo_write(cdev, 0,
|
||
M_CAN_FIFO_DATA(i / 4),
|
||
*(u32 *)(cf->data + i));
|
||
|
||
can_put_echo_skb(skb, dev, 0);
|
||
|
||
if (cdev->can.ctrlmode & CAN_CTRLMODE_FD) {
|
||
cccr = m_can_read(cdev, M_CAN_CCCR);
|
||
cccr &= ~(CCCR_CMR_MASK << CCCR_CMR_SHIFT);
|
||
if (can_is_canfd_skb(skb)) {
|
||
if (cf->flags & CANFD_BRS)
|
||
cccr |= CCCR_CMR_CANFD_BRS <<
|
||
CCCR_CMR_SHIFT;
|
||
else
|
||
cccr |= CCCR_CMR_CANFD <<
|
||
CCCR_CMR_SHIFT;
|
||
} else {
|
||
cccr |= CCCR_CMR_CAN << CCCR_CMR_SHIFT;
|
||
}
|
||
m_can_write(cdev, M_CAN_CCCR, cccr);
|
||
}
|
||
m_can_write(cdev, M_CAN_TXBTIE, 0x1);
|
||
m_can_write(cdev, M_CAN_TXBAR, 0x1);
|
||
/* End of xmit function for version 3.0.x */
|
||
} else {
|
||
/* Transmit routine for version >= v3.1.x */
|
||
|
||
/* Check if FIFO full */
|
||
if (m_can_tx_fifo_full(cdev)) {
|
||
/* This shouldn't happen */
|
||
netif_stop_queue(dev);
|
||
netdev_warn(dev,
|
||
"TX queue active although FIFO is full.");
|
||
|
||
if (cdev->is_peripheral) {
|
||
kfree_skb(skb);
|
||
dev->stats.tx_dropped++;
|
||
return NETDEV_TX_OK;
|
||
} else {
|
||
return NETDEV_TX_BUSY;
|
||
}
|
||
}
|
||
|
||
/* get put index for frame */
|
||
putidx = ((m_can_read(cdev, M_CAN_TXFQS) & TXFQS_TFQPI_MASK)
|
||
>> TXFQS_TFQPI_SHIFT);
|
||
/* Write ID Field to FIFO Element */
|
||
m_can_fifo_write(cdev, putidx, M_CAN_FIFO_ID, id);
|
||
|
||
/* get CAN FD configuration of frame */
|
||
fdflags = 0;
|
||
if (can_is_canfd_skb(skb)) {
|
||
fdflags |= TX_BUF_FDF;
|
||
if (cf->flags & CANFD_BRS)
|
||
fdflags |= TX_BUF_BRS;
|
||
}
|
||
|
||
/* Construct DLC Field. Also contains CAN-FD configuration
|
||
* use put index of fifo as message marker
|
||
* it is used in TX interrupt for
|
||
* sending the correct echo frame
|
||
*/
|
||
m_can_fifo_write(cdev, putidx, M_CAN_FIFO_DLC,
|
||
((putidx << TX_BUF_MM_SHIFT) &
|
||
TX_BUF_MM_MASK) |
|
||
(can_len2dlc(cf->len) << 16) |
|
||
fdflags | TX_BUF_EFC);
|
||
|
||
for (i = 0; i < cf->len; i += 4)
|
||
m_can_fifo_write(cdev, putidx, M_CAN_FIFO_DATA(i / 4),
|
||
*(u32 *)(cf->data + i));
|
||
|
||
/* Push loopback echo.
|
||
* Will be looped back on TX interrupt based on message marker
|
||
*/
|
||
can_put_echo_skb(skb, dev, putidx);
|
||
|
||
/* Enable TX FIFO element to start transfer */
|
||
m_can_write(cdev, M_CAN_TXBAR, (1 << putidx));
|
||
|
||
/* stop network queue if fifo full */
|
||
if (m_can_tx_fifo_full(cdev) ||
|
||
m_can_next_echo_skb_occupied(dev, putidx))
|
||
netif_stop_queue(dev);
|
||
}
|
||
|
||
return NETDEV_TX_OK;
|
||
}
|
||
|
||
static void m_can_tx_work_queue(struct work_struct *ws)
|
||
{
|
||
struct m_can_classdev *cdev = container_of(ws, struct m_can_classdev,
|
||
tx_work);
|
||
|
||
m_can_tx_handler(cdev);
|
||
cdev->tx_skb = NULL;
|
||
}
|
||
|
||
static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
|
||
struct net_device *dev)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
|
||
if (can_dropped_invalid_skb(dev, skb))
|
||
return NETDEV_TX_OK;
|
||
|
||
if (cdev->is_peripheral) {
|
||
if (cdev->tx_skb) {
|
||
netdev_err(dev, "hard_xmit called while tx busy\n");
|
||
return NETDEV_TX_BUSY;
|
||
}
|
||
|
||
if (cdev->can.state == CAN_STATE_BUS_OFF) {
|
||
m_can_clean(dev);
|
||
} else {
|
||
/* Need to stop the queue to avoid numerous requests
|
||
* from being sent. Suggested improvement is to create
|
||
* a queueing mechanism that will queue the skbs and
|
||
* process them in order.
|
||
*/
|
||
cdev->tx_skb = skb;
|
||
netif_stop_queue(cdev->net);
|
||
queue_work(cdev->tx_wq, &cdev->tx_work);
|
||
}
|
||
} else {
|
||
cdev->tx_skb = skb;
|
||
return m_can_tx_handler(cdev);
|
||
}
|
||
|
||
return NETDEV_TX_OK;
|
||
}
|
||
|
||
static int m_can_open(struct net_device *dev)
|
||
{
|
||
struct m_can_classdev *cdev = netdev_priv(dev);
|
||
int err;
|
||
|
||
err = m_can_clk_start(cdev);
|
||
if (err)
|
||
return err;
|
||
|
||
/* open the can device */
|
||
err = open_candev(dev);
|
||
if (err) {
|
||
netdev_err(dev, "failed to open can device\n");
|
||
goto exit_disable_clks;
|
||
}
|
||
|
||
/* register interrupt handler */
|
||
if (cdev->is_peripheral) {
|
||
cdev->tx_skb = NULL;
|
||
cdev->tx_wq = alloc_workqueue("mcan_wq",
|
||
WQ_FREEZABLE | WQ_MEM_RECLAIM, 0);
|
||
if (!cdev->tx_wq) {
|
||
err = -ENOMEM;
|
||
goto out_wq_fail;
|
||
}
|
||
|
||
INIT_WORK(&cdev->tx_work, m_can_tx_work_queue);
|
||
|
||
err = request_threaded_irq(dev->irq, NULL, m_can_isr,
|
||
IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
|
||
dev->name, dev);
|
||
} else {
|
||
err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name,
|
||
dev);
|
||
}
|
||
|
||
if (err < 0) {
|
||
netdev_err(dev, "failed to request interrupt\n");
|
||
goto exit_irq_fail;
|
||
}
|
||
|
||
/* start the m_can controller */
|
||
m_can_start(dev);
|
||
|
||
can_led_event(dev, CAN_LED_EVENT_OPEN);
|
||
|
||
if (!cdev->is_peripheral)
|
||
napi_enable(&cdev->napi);
|
||
|
||
netif_start_queue(dev);
|
||
|
||
return 0;
|
||
|
||
exit_irq_fail:
|
||
if (cdev->is_peripheral)
|
||
destroy_workqueue(cdev->tx_wq);
|
||
out_wq_fail:
|
||
close_candev(dev);
|
||
exit_disable_clks:
|
||
m_can_clk_stop(cdev);
|
||
return err;
|
||
}
|
||
|
||
static const struct net_device_ops m_can_netdev_ops = {
|
||
.ndo_open = m_can_open,
|
||
.ndo_stop = m_can_close,
|
||
.ndo_start_xmit = m_can_start_xmit,
|
||
.ndo_change_mtu = can_change_mtu,
|
||
};
|
||
|
||
static int register_m_can_dev(struct net_device *dev)
|
||
{
|
||
dev->flags |= IFF_ECHO; /* we support local echo */
|
||
dev->netdev_ops = &m_can_netdev_ops;
|
||
|
||
return register_candev(dev);
|
||
}
|
||
|
||
static void m_can_of_parse_mram(struct m_can_classdev *cdev,
|
||
const u32 *mram_config_vals)
|
||
{
|
||
cdev->mcfg[MRAM_SIDF].off = mram_config_vals[0];
|
||
cdev->mcfg[MRAM_SIDF].num = mram_config_vals[1];
|
||
cdev->mcfg[MRAM_XIDF].off = cdev->mcfg[MRAM_SIDF].off +
|
||
cdev->mcfg[MRAM_SIDF].num * SIDF_ELEMENT_SIZE;
|
||
cdev->mcfg[MRAM_XIDF].num = mram_config_vals[2];
|
||
cdev->mcfg[MRAM_RXF0].off = cdev->mcfg[MRAM_XIDF].off +
|
||
cdev->mcfg[MRAM_XIDF].num * XIDF_ELEMENT_SIZE;
|
||
cdev->mcfg[MRAM_RXF0].num = mram_config_vals[3] &
|
||
(RXFC_FS_MASK >> RXFC_FS_SHIFT);
|
||
cdev->mcfg[MRAM_RXF1].off = cdev->mcfg[MRAM_RXF0].off +
|
||
cdev->mcfg[MRAM_RXF0].num * RXF0_ELEMENT_SIZE;
|
||
cdev->mcfg[MRAM_RXF1].num = mram_config_vals[4] &
|
||
(RXFC_FS_MASK >> RXFC_FS_SHIFT);
|
||
cdev->mcfg[MRAM_RXB].off = cdev->mcfg[MRAM_RXF1].off +
|
||
cdev->mcfg[MRAM_RXF1].num * RXF1_ELEMENT_SIZE;
|
||
cdev->mcfg[MRAM_RXB].num = mram_config_vals[5];
|
||
cdev->mcfg[MRAM_TXE].off = cdev->mcfg[MRAM_RXB].off +
|
||
cdev->mcfg[MRAM_RXB].num * RXB_ELEMENT_SIZE;
|
||
cdev->mcfg[MRAM_TXE].num = mram_config_vals[6];
|
||
cdev->mcfg[MRAM_TXB].off = cdev->mcfg[MRAM_TXE].off +
|
||
cdev->mcfg[MRAM_TXE].num * TXE_ELEMENT_SIZE;
|
||
cdev->mcfg[MRAM_TXB].num = mram_config_vals[7] &
|
||
(TXBC_NDTB_MASK >> TXBC_NDTB_SHIFT);
|
||
|
||
dev_dbg(cdev->dev,
|
||
"sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
|
||
cdev->mcfg[MRAM_SIDF].off, cdev->mcfg[MRAM_SIDF].num,
|
||
cdev->mcfg[MRAM_XIDF].off, cdev->mcfg[MRAM_XIDF].num,
|
||
cdev->mcfg[MRAM_RXF0].off, cdev->mcfg[MRAM_RXF0].num,
|
||
cdev->mcfg[MRAM_RXF1].off, cdev->mcfg[MRAM_RXF1].num,
|
||
cdev->mcfg[MRAM_RXB].off, cdev->mcfg[MRAM_RXB].num,
|
||
cdev->mcfg[MRAM_TXE].off, cdev->mcfg[MRAM_TXE].num,
|
||
cdev->mcfg[MRAM_TXB].off, cdev->mcfg[MRAM_TXB].num);
|
||
}
|
||
|
||
void m_can_init_ram(struct m_can_classdev *cdev)
|
||
{
|
||
int end, i, start;
|
||
|
||
/* initialize the entire Message RAM in use to avoid possible
|
||
* ECC/parity checksum errors when reading an uninitialized buffer
|
||
*/
|
||
start = cdev->mcfg[MRAM_SIDF].off;
|
||
end = cdev->mcfg[MRAM_TXB].off +
|
||
cdev->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
|
||
|
||
for (i = start; i < end; i += 4)
|
||
m_can_fifo_write_no_off(cdev, i, 0x0);
|
||
}
|
||
EXPORT_SYMBOL_GPL(m_can_init_ram);
|
||
|
||
int m_can_class_get_clocks(struct m_can_classdev *m_can_dev)
|
||
{
|
||
int ret = 0;
|
||
|
||
m_can_dev->hclk = devm_clk_get(m_can_dev->dev, "hclk");
|
||
m_can_dev->cclk = devm_clk_get(m_can_dev->dev, "cclk");
|
||
|
||
if (IS_ERR(m_can_dev->cclk)) {
|
||
dev_err(m_can_dev->dev, "no clock found\n");
|
||
ret = -ENODEV;
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
EXPORT_SYMBOL_GPL(m_can_class_get_clocks);
|
||
|
||
struct m_can_classdev *m_can_class_allocate_dev(struct device *dev)
|
||
{
|
||
struct m_can_classdev *class_dev = NULL;
|
||
u32 mram_config_vals[MRAM_CFG_LEN];
|
||
struct net_device *net_dev;
|
||
u32 tx_fifo_size;
|
||
int ret;
|
||
|
||
ret = fwnode_property_read_u32_array(dev_fwnode(dev),
|
||
"bosch,mram-cfg",
|
||
mram_config_vals,
|
||
sizeof(mram_config_vals) / 4);
|
||
if (ret) {
|
||
dev_err(dev, "Could not get Message RAM configuration.");
|
||
goto out;
|
||
}
|
||
|
||
/* Get TX FIFO size
|
||
* Defines the total amount of echo buffers for loopback
|
||
*/
|
||
tx_fifo_size = mram_config_vals[7];
|
||
|
||
/* allocate the m_can device */
|
||
net_dev = alloc_candev(sizeof(*class_dev), tx_fifo_size);
|
||
if (!net_dev) {
|
||
dev_err(dev, "Failed to allocate CAN device");
|
||
goto out;
|
||
}
|
||
|
||
class_dev = netdev_priv(net_dev);
|
||
if (!class_dev) {
|
||
dev_err(dev, "Failed to init netdev cdevate");
|
||
goto out;
|
||
}
|
||
|
||
class_dev->net = net_dev;
|
||
class_dev->dev = dev;
|
||
SET_NETDEV_DEV(net_dev, dev);
|
||
|
||
m_can_of_parse_mram(class_dev, mram_config_vals);
|
||
out:
|
||
return class_dev;
|
||
}
|
||
EXPORT_SYMBOL_GPL(m_can_class_allocate_dev);
|
||
|
||
int m_can_class_register(struct m_can_classdev *m_can_dev)
|
||
{
|
||
int ret;
|
||
|
||
if (m_can_dev->pm_clock_support) {
|
||
pm_runtime_enable(m_can_dev->dev);
|
||
ret = m_can_clk_start(m_can_dev);
|
||
if (ret)
|
||
goto pm_runtime_fail;
|
||
}
|
||
|
||
ret = m_can_dev_setup(m_can_dev);
|
||
if (ret)
|
||
goto clk_disable;
|
||
|
||
ret = register_m_can_dev(m_can_dev->net);
|
||
if (ret) {
|
||
dev_err(m_can_dev->dev, "registering %s failed (err=%d)\n",
|
||
m_can_dev->net->name, ret);
|
||
goto clk_disable;
|
||
}
|
||
|
||
devm_can_led_init(m_can_dev->net);
|
||
|
||
of_can_transceiver(m_can_dev->net);
|
||
|
||
dev_info(m_can_dev->dev, "%s device registered (irq=%d, version=%d)\n",
|
||
KBUILD_MODNAME, m_can_dev->net->irq, m_can_dev->version);
|
||
|
||
/* Probe finished
|
||
* Stop clocks. They will be reactivated once the M_CAN device is opened
|
||
*/
|
||
clk_disable:
|
||
m_can_clk_stop(m_can_dev);
|
||
pm_runtime_fail:
|
||
if (ret) {
|
||
if (m_can_dev->pm_clock_support)
|
||
pm_runtime_disable(m_can_dev->dev);
|
||
free_candev(m_can_dev->net);
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
EXPORT_SYMBOL_GPL(m_can_class_register);
|
||
|
||
int m_can_class_suspend(struct device *dev)
|
||
{
|
||
struct net_device *ndev = dev_get_drvdata(dev);
|
||
struct m_can_classdev *cdev = netdev_priv(ndev);
|
||
|
||
if (netif_running(ndev)) {
|
||
netif_stop_queue(ndev);
|
||
netif_device_detach(ndev);
|
||
m_can_stop(ndev);
|
||
m_can_clk_stop(cdev);
|
||
}
|
||
|
||
pinctrl_pm_select_sleep_state(dev);
|
||
|
||
cdev->can.state = CAN_STATE_SLEEPING;
|
||
|
||
return 0;
|
||
}
|
||
EXPORT_SYMBOL_GPL(m_can_class_suspend);
|
||
|
||
int m_can_class_resume(struct device *dev)
|
||
{
|
||
struct net_device *ndev = dev_get_drvdata(dev);
|
||
struct m_can_classdev *cdev = netdev_priv(ndev);
|
||
|
||
pinctrl_pm_select_default_state(dev);
|
||
|
||
cdev->can.state = CAN_STATE_ERROR_ACTIVE;
|
||
|
||
if (netif_running(ndev)) {
|
||
int ret;
|
||
|
||
ret = m_can_clk_start(cdev);
|
||
if (ret)
|
||
return ret;
|
||
|
||
m_can_init_ram(cdev);
|
||
m_can_start(ndev);
|
||
netif_device_attach(ndev);
|
||
netif_start_queue(ndev);
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
EXPORT_SYMBOL_GPL(m_can_class_resume);
|
||
|
||
void m_can_class_unregister(struct m_can_classdev *m_can_dev)
|
||
{
|
||
unregister_candev(m_can_dev->net);
|
||
|
||
m_can_clk_stop(m_can_dev);
|
||
|
||
free_candev(m_can_dev->net);
|
||
}
|
||
EXPORT_SYMBOL_GPL(m_can_class_unregister);
|
||
|
||
MODULE_AUTHOR("Dong Aisheng <b29396@freescale.com>");
|
||
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
|
||
MODULE_LICENSE("GPL v2");
|
||
MODULE_DESCRIPTION("CAN bus driver for Bosch M_CAN controller");
|