From a23b97e6255b83babd28345e43a29508981f931e Mon Sep 17 00:00:00 2001 From: Ramesh Shanmugasundaram Date: Fri, 17 Jun 2016 09:20:56 +0100 Subject: can: rcar_can: Move Renesas CAN driver to rcar dir This patch clubs the Renesas controller drivers in one rcar dir. Signed-off-by: Ramesh Shanmugasundaram Signed-off-by: Marc Kleine-Budde --- drivers/net/can/Kconfig | 10 - drivers/net/can/Makefile | 1 - drivers/net/can/rcar/Kconfig | 10 + drivers/net/can/rcar/Makefile | 3 +- drivers/net/can/rcar/rcar_can.c | 929 ++++++++++++++++++++++++++++++++++++++++ drivers/net/can/rcar_can.c | 929 ---------------------------------------- 6 files changed, 941 insertions(+), 941 deletions(-) create mode 100644 drivers/net/can/rcar/rcar_can.c delete mode 100644 drivers/net/can/rcar_can.c (limited to 'drivers/net') diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig index 13003a9472f2..22570ea3a8d2 100644 --- a/drivers/net/can/Kconfig +++ b/drivers/net/can/Kconfig @@ -104,16 +104,6 @@ config CAN_JANZ_ICAN3 This driver can also be built as a module. If so, the module will be called janz-ican3.ko. -config CAN_RCAR - tristate "Renesas R-Car CAN controller" - depends on ARCH_RENESAS || ARM - ---help--- - Say Y here if you want to use CAN controller found on Renesas R-Car - SoCs. - - To compile this driver as a module, choose M here: the module will - be called rcar_can. - config CAN_SUN4I tristate "Allwinner A10 CAN controller" depends on MACH_SUN4I || MACH_SUN7I || COMPILE_TEST diff --git a/drivers/net/can/Makefile b/drivers/net/can/Makefile index 226d5b516746..26ba4b794a0b 100644 --- a/drivers/net/can/Makefile +++ b/drivers/net/can/Makefile @@ -25,7 +25,6 @@ obj-$(CONFIG_CAN_IFI_CANFD) += ifi_canfd/ obj-$(CONFIG_CAN_JANZ_ICAN3) += janz-ican3.o obj-$(CONFIG_CAN_MSCAN) += mscan/ obj-$(CONFIG_CAN_M_CAN) += m_can/ -obj-$(CONFIG_CAN_RCAR) += rcar_can.o obj-$(CONFIG_CAN_SJA1000) += sja1000/ obj-$(CONFIG_CAN_SUN4I) += sun4i_can.o obj-$(CONFIG_CAN_TI_HECC) += ti_hecc.o diff --git a/drivers/net/can/rcar/Kconfig b/drivers/net/can/rcar/Kconfig index 6ea64d19ec26..7b03a3a37db7 100644 --- a/drivers/net/can/rcar/Kconfig +++ b/drivers/net/can/rcar/Kconfig @@ -1,3 +1,13 @@ +config CAN_RCAR + tristate "Renesas R-Car CAN controller" + depends on ARCH_RENESAS || ARM + ---help--- + Say Y here if you want to use CAN controller found on Renesas R-Car + SoCs. + + To compile this driver as a module, choose M here: the module will + be called rcar_can. + config CAN_RCAR_CANFD tristate "Renesas R-Car CAN FD controller" depends on ARCH_RENESAS || ARM diff --git a/drivers/net/can/rcar/Makefile b/drivers/net/can/rcar/Makefile index cbaf498e1ac7..08de36a4cfcc 100644 --- a/drivers/net/can/rcar/Makefile +++ b/drivers/net/can/rcar/Makefile @@ -1,5 +1,6 @@ # -# Makefile for the Renesas R-Car CAN FD controller driver +# Makefile for the Renesas R-Car CAN & CAN FD controller drivers # +obj-$(CONFIG_CAN_RCAR) += rcar_can.o obj-$(CONFIG_CAN_RCAR_CANFD) += rcar_canfd.o diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c new file mode 100644 index 000000000000..788459f6bf5c --- /dev/null +++ b/drivers/net/can/rcar/rcar_can.c @@ -0,0 +1,929 @@ +/* Renesas R-Car CAN device driver + * + * Copyright (C) 2013 Cogent Embedded, Inc. + * Copyright (C) 2013 Renesas Solutions Corp. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define RCAR_CAN_DRV_NAME "rcar_can" + +/* Mailbox configuration: + * mailbox 60 - 63 - Rx FIFO mailboxes + * mailbox 56 - 59 - Tx FIFO mailboxes + * non-FIFO mailboxes are not used + */ +#define RCAR_CAN_N_MBX 64 /* Number of mailboxes in non-FIFO mode */ +#define RCAR_CAN_RX_FIFO_MBX 60 /* Mailbox - window to Rx FIFO */ +#define RCAR_CAN_TX_FIFO_MBX 56 /* Mailbox - window to Tx FIFO */ +#define RCAR_CAN_FIFO_DEPTH 4 + +/* Mailbox registers structure */ +struct rcar_can_mbox_regs { + u32 id; /* IDE and RTR bits, SID and EID */ + u8 stub; /* Not used */ + u8 dlc; /* Data Length Code - bits [0..3] */ + u8 data[8]; /* Data Bytes */ + u8 tsh; /* Time Stamp Higher Byte */ + u8 tsl; /* Time Stamp Lower Byte */ +}; + +struct rcar_can_regs { + struct rcar_can_mbox_regs mb[RCAR_CAN_N_MBX]; /* Mailbox registers */ + u32 mkr_2_9[8]; /* Mask Registers 2-9 */ + u32 fidcr[2]; /* FIFO Received ID Compare Register */ + u32 mkivlr1; /* Mask Invalid Register 1 */ + u32 mier1; /* Mailbox Interrupt Enable Register 1 */ + u32 mkr_0_1[2]; /* Mask Registers 0-1 */ + u32 mkivlr0; /* Mask Invalid Register 0*/ + u32 mier0; /* Mailbox Interrupt Enable Register 0 */ + u8 pad_440[0x3c0]; + u8 mctl[64]; /* Message Control Registers */ + u16 ctlr; /* Control Register */ + u16 str; /* Status register */ + u8 bcr[3]; /* Bit Configuration Register */ + u8 clkr; /* Clock Select Register */ + u8 rfcr; /* Receive FIFO Control Register */ + u8 rfpcr; /* Receive FIFO Pointer Control Register */ + u8 tfcr; /* Transmit FIFO Control Register */ + u8 tfpcr; /* Transmit FIFO Pointer Control Register */ + u8 eier; /* Error Interrupt Enable Register */ + u8 eifr; /* Error Interrupt Factor Judge Register */ + u8 recr; /* Receive Error Count Register */ + u8 tecr; /* Transmit Error Count Register */ + u8 ecsr; /* Error Code Store Register */ + u8 cssr; /* Channel Search Support Register */ + u8 mssr; /* Mailbox Search Status Register */ + u8 msmr; /* Mailbox Search Mode Register */ + u16 tsr; /* Time Stamp Register */ + u8 afsr; /* Acceptance Filter Support Register */ + u8 pad_857; + u8 tcr; /* Test Control Register */ + u8 pad_859[7]; + u8 ier; /* Interrupt Enable Register */ + u8 isr; /* Interrupt Status Register */ + u8 pad_862; + u8 mbsmr; /* Mailbox Search Mask Register */ +}; + +struct rcar_can_priv { + struct can_priv can; /* Must be the first member! */ + struct net_device *ndev; + struct napi_struct napi; + struct rcar_can_regs __iomem *regs; + struct clk *clk; + struct clk *can_clk; + u8 tx_dlc[RCAR_CAN_FIFO_DEPTH]; + u32 tx_head; + u32 tx_tail; + u8 clock_select; + u8 ier; +}; + +static const struct can_bittiming_const rcar_can_bittiming_const = { + .name = RCAR_CAN_DRV_NAME, + .tseg1_min = 4, + .tseg1_max = 16, + .tseg2_min = 2, + .tseg2_max = 8, + .sjw_max = 4, + .brp_min = 1, + .brp_max = 1024, + .brp_inc = 1, +}; + +/* Control Register bits */ +#define RCAR_CAN_CTLR_BOM (3 << 11) /* Bus-Off Recovery Mode Bits */ +#define RCAR_CAN_CTLR_BOM_ENT (1 << 11) /* Entry to halt mode */ + /* at bus-off entry */ +#define RCAR_CAN_CTLR_SLPM (1 << 10) +#define RCAR_CAN_CTLR_CANM (3 << 8) /* Operating Mode Select Bit */ +#define RCAR_CAN_CTLR_CANM_HALT (1 << 9) +#define RCAR_CAN_CTLR_CANM_RESET (1 << 8) +#define RCAR_CAN_CTLR_CANM_FORCE_RESET (3 << 8) +#define RCAR_CAN_CTLR_MLM (1 << 3) /* Message Lost Mode Select */ +#define RCAR_CAN_CTLR_IDFM (3 << 1) /* ID Format Mode Select Bits */ +#define RCAR_CAN_CTLR_IDFM_MIXED (1 << 2) /* Mixed ID mode */ +#define RCAR_CAN_CTLR_MBM (1 << 0) /* Mailbox Mode select */ + +/* Status Register bits */ +#define RCAR_CAN_STR_RSTST (1 << 8) /* Reset Status Bit */ + +/* FIFO Received ID Compare Registers 0 and 1 bits */ +#define RCAR_CAN_FIDCR_IDE (1 << 31) /* ID Extension Bit */ +#define RCAR_CAN_FIDCR_RTR (1 << 30) /* Remote Transmission Request Bit */ + +/* Receive FIFO Control Register bits */ +#define RCAR_CAN_RFCR_RFEST (1 << 7) /* Receive FIFO Empty Status Flag */ +#define RCAR_CAN_RFCR_RFE (1 << 0) /* Receive FIFO Enable */ + +/* Transmit FIFO Control Register bits */ +#define RCAR_CAN_TFCR_TFUST (7 << 1) /* Transmit FIFO Unsent Message */ + /* Number Status Bits */ +#define RCAR_CAN_TFCR_TFUST_SHIFT 1 /* Offset of Transmit FIFO Unsent */ + /* Message Number Status Bits */ +#define RCAR_CAN_TFCR_TFE (1 << 0) /* Transmit FIFO Enable */ + +#define RCAR_CAN_N_RX_MKREGS1 2 /* Number of mask registers */ + /* for Rx mailboxes 0-31 */ +#define RCAR_CAN_N_RX_MKREGS2 8 + +/* Bit Configuration Register settings */ +#define RCAR_CAN_BCR_TSEG1(x) (((x) & 0x0f) << 20) +#define RCAR_CAN_BCR_BPR(x) (((x) & 0x3ff) << 8) +#define RCAR_CAN_BCR_SJW(x) (((x) & 0x3) << 4) +#define RCAR_CAN_BCR_TSEG2(x) ((x) & 0x07) + +/* Mailbox and Mask Registers bits */ +#define RCAR_CAN_IDE (1 << 31) +#define RCAR_CAN_RTR (1 << 30) +#define RCAR_CAN_SID_SHIFT 18 + +/* Mailbox Interrupt Enable Register 1 bits */ +#define RCAR_CAN_MIER1_RXFIE (1 << 28) /* Receive FIFO Interrupt Enable */ +#define RCAR_CAN_MIER1_TXFIE (1 << 24) /* Transmit FIFO Interrupt Enable */ + +/* Interrupt Enable Register bits */ +#define RCAR_CAN_IER_ERSIE (1 << 5) /* Error (ERS) Interrupt Enable Bit */ +#define RCAR_CAN_IER_RXFIE (1 << 4) /* Reception FIFO Interrupt */ + /* Enable Bit */ +#define RCAR_CAN_IER_TXFIE (1 << 3) /* Transmission FIFO Interrupt */ + /* Enable Bit */ +/* Interrupt Status Register bits */ +#define RCAR_CAN_ISR_ERSF (1 << 5) /* Error (ERS) Interrupt Status Bit */ +#define RCAR_CAN_ISR_RXFF (1 << 4) /* Reception FIFO Interrupt */ + /* Status Bit */ +#define RCAR_CAN_ISR_TXFF (1 << 3) /* Transmission FIFO Interrupt */ + /* Status Bit */ + +/* Error Interrupt Enable Register bits */ +#define RCAR_CAN_EIER_BLIE (1 << 7) /* Bus Lock Interrupt Enable */ +#define RCAR_CAN_EIER_OLIE (1 << 6) /* Overload Frame Transmit */ + /* Interrupt Enable */ +#define RCAR_CAN_EIER_ORIE (1 << 5) /* Receive Overrun Interrupt Enable */ +#define RCAR_CAN_EIER_BORIE (1 << 4) /* Bus-Off Recovery Interrupt Enable */ +#define RCAR_CAN_EIER_BOEIE (1 << 3) /* Bus-Off Entry Interrupt Enable */ +#define RCAR_CAN_EIER_EPIE (1 << 2) /* Error Passive Interrupt Enable */ +#define RCAR_CAN_EIER_EWIE (1 << 1) /* Error Warning Interrupt Enable */ +#define RCAR_CAN_EIER_BEIE (1 << 0) /* Bus Error Interrupt Enable */ + +/* Error Interrupt Factor Judge Register bits */ +#define RCAR_CAN_EIFR_BLIF (1 << 7) /* Bus Lock Detect Flag */ +#define RCAR_CAN_EIFR_OLIF (1 << 6) /* Overload Frame Transmission */ + /* Detect Flag */ +#define RCAR_CAN_EIFR_ORIF (1 << 5) /* Receive Overrun Detect Flag */ +#define RCAR_CAN_EIFR_BORIF (1 << 4) /* Bus-Off Recovery Detect Flag */ +#define RCAR_CAN_EIFR_BOEIF (1 << 3) /* Bus-Off Entry Detect Flag */ +#define RCAR_CAN_EIFR_EPIF (1 << 2) /* Error Passive Detect Flag */ +#define RCAR_CAN_EIFR_EWIF (1 << 1) /* Error Warning Detect Flag */ +#define RCAR_CAN_EIFR_BEIF (1 << 0) /* Bus Error Detect Flag */ + +/* Error Code Store Register bits */ +#define RCAR_CAN_ECSR_EDPM (1 << 7) /* Error Display Mode Select Bit */ +#define RCAR_CAN_ECSR_ADEF (1 << 6) /* ACK Delimiter Error Flag */ +#define RCAR_CAN_ECSR_BE0F (1 << 5) /* Bit Error (dominant) Flag */ +#define RCAR_CAN_ECSR_BE1F (1 << 4) /* Bit Error (recessive) Flag */ +#define RCAR_CAN_ECSR_CEF (1 << 3) /* CRC Error Flag */ +#define RCAR_CAN_ECSR_AEF (1 << 2) /* ACK Error Flag */ +#define RCAR_CAN_ECSR_FEF (1 << 1) /* Form Error Flag */ +#define RCAR_CAN_ECSR_SEF (1 << 0) /* Stuff Error Flag */ + +#define RCAR_CAN_NAPI_WEIGHT 4 +#define MAX_STR_READS 0x100 + +static void tx_failure_cleanup(struct net_device *ndev) +{ + int i; + + for (i = 0; i < RCAR_CAN_FIFO_DEPTH; i++) + can_free_echo_skb(ndev, i); +} + +static void rcar_can_error(struct net_device *ndev) +{ + struct rcar_can_priv *priv = netdev_priv(ndev); + struct net_device_stats *stats = &ndev->stats; + struct can_frame *cf; + struct sk_buff *skb; + u8 eifr, txerr = 0, rxerr = 0; + + /* Propagate the error condition to the CAN stack */ + skb = alloc_can_err_skb(ndev, &cf); + + eifr = readb(&priv->regs->eifr); + if (eifr & (RCAR_CAN_EIFR_EWIF | RCAR_CAN_EIFR_EPIF)) { + txerr = readb(&priv->regs->tecr); + rxerr = readb(&priv->regs->recr); + if (skb) { + cf->can_id |= CAN_ERR_CRTL; + cf->data[6] = txerr; + cf->data[7] = rxerr; + } + } + if (eifr & RCAR_CAN_EIFR_BEIF) { + int rx_errors = 0, tx_errors = 0; + u8 ecsr; + + netdev_dbg(priv->ndev, "Bus error interrupt:\n"); + if (skb) + cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT; + + ecsr = readb(&priv->regs->ecsr); + if (ecsr & RCAR_CAN_ECSR_ADEF) { + netdev_dbg(priv->ndev, "ACK Delimiter Error\n"); + tx_errors++; + writeb(~RCAR_CAN_ECSR_ADEF, &priv->regs->ecsr); + if (skb) + cf->data[3] = CAN_ERR_PROT_LOC_ACK_DEL; + } + if (ecsr & RCAR_CAN_ECSR_BE0F) { + netdev_dbg(priv->ndev, "Bit Error (dominant)\n"); + tx_errors++; + writeb(~RCAR_CAN_ECSR_BE0F, &priv->regs->ecsr); + if (skb) + cf->data[2] |= CAN_ERR_PROT_BIT0; + } + if (ecsr & RCAR_CAN_ECSR_BE1F) { + netdev_dbg(priv->ndev, "Bit Error (recessive)\n"); + tx_errors++; + writeb(~RCAR_CAN_ECSR_BE1F, &priv->regs->ecsr); + if (skb) + cf->data[2] |= CAN_ERR_PROT_BIT1; + } + if (ecsr & RCAR_CAN_ECSR_CEF) { + netdev_dbg(priv->ndev, "CRC Error\n"); + rx_errors++; + writeb(~RCAR_CAN_ECSR_CEF, &priv->regs->ecsr); + if (skb) + cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; + } + if (ecsr & RCAR_CAN_ECSR_AEF) { + netdev_dbg(priv->ndev, "ACK Error\n"); + tx_errors++; + writeb(~RCAR_CAN_ECSR_AEF, &priv->regs->ecsr); + if (skb) { + cf->can_id |= CAN_ERR_ACK; + cf->data[3] = CAN_ERR_PROT_LOC_ACK; + } + } + if (ecsr & RCAR_CAN_ECSR_FEF) { + netdev_dbg(priv->ndev, "Form Error\n"); + rx_errors++; + writeb(~RCAR_CAN_ECSR_FEF, &priv->regs->ecsr); + if (skb) + cf->data[2] |= CAN_ERR_PROT_FORM; + } + if (ecsr & RCAR_CAN_ECSR_SEF) { + netdev_dbg(priv->ndev, "Stuff Error\n"); + rx_errors++; + writeb(~RCAR_CAN_ECSR_SEF, &priv->regs->ecsr); + if (skb) + cf->data[2] |= CAN_ERR_PROT_STUFF; + } + + priv->can.can_stats.bus_error++; + ndev->stats.rx_errors += rx_errors; + ndev->stats.tx_errors += tx_errors; + writeb(~RCAR_CAN_EIFR_BEIF, &priv->regs->eifr); + } + if (eifr & RCAR_CAN_EIFR_EWIF) { + netdev_dbg(priv->ndev, "Error warning interrupt\n"); + priv->can.state = CAN_STATE_ERROR_WARNING; + priv->can.can_stats.error_warning++; + /* Clear interrupt condition */ + writeb(~RCAR_CAN_EIFR_EWIF, &priv->regs->eifr); + if (skb) + cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_WARNING : + CAN_ERR_CRTL_RX_WARNING; + } + if (eifr & RCAR_CAN_EIFR_EPIF) { + netdev_dbg(priv->ndev, "Error passive interrupt\n"); + priv->can.state = CAN_STATE_ERROR_PASSIVE; + priv->can.can_stats.error_passive++; + /* Clear interrupt condition */ + writeb(~RCAR_CAN_EIFR_EPIF, &priv->regs->eifr); + if (skb) + cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_PASSIVE : + CAN_ERR_CRTL_RX_PASSIVE; + } + if (eifr & RCAR_CAN_EIFR_BOEIF) { + netdev_dbg(priv->ndev, "Bus-off entry interrupt\n"); + tx_failure_cleanup(ndev); + priv->ier = RCAR_CAN_IER_ERSIE; + writeb(priv->ier, &priv->regs->ier); + priv->can.state = CAN_STATE_BUS_OFF; + /* Clear interrupt condition */ + writeb(~RCAR_CAN_EIFR_BOEIF, &priv->regs->eifr); + priv->can.can_stats.bus_off++; + can_bus_off(ndev); + if (skb) + cf->can_id |= CAN_ERR_BUSOFF; + } + if (eifr & RCAR_CAN_EIFR_ORIF) { + netdev_dbg(priv->ndev, "Receive overrun error interrupt\n"); + ndev->stats.rx_over_errors++; + ndev->stats.rx_errors++; + writeb(~RCAR_CAN_EIFR_ORIF, &priv->regs->eifr); + if (skb) { + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; + } + } + if (eifr & RCAR_CAN_EIFR_OLIF) { + netdev_dbg(priv->ndev, + "Overload Frame Transmission error interrupt\n"); + ndev->stats.rx_over_errors++; + ndev->stats.rx_errors++; + writeb(~RCAR_CAN_EIFR_OLIF, &priv->regs->eifr); + if (skb) { + cf->can_id |= CAN_ERR_PROT; + cf->data[2] |= CAN_ERR_PROT_OVERLOAD; + } + } + + if (skb) { + stats->rx_packets++; + stats->rx_bytes += cf->can_dlc; + netif_rx(skb); + } +} + +static void rcar_can_tx_done(struct net_device *ndev) +{ + struct rcar_can_priv *priv = netdev_priv(ndev); + struct net_device_stats *stats = &ndev->stats; + u8 isr; + + while (1) { + u8 unsent = readb(&priv->regs->tfcr); + + unsent = (unsent & RCAR_CAN_TFCR_TFUST) >> + RCAR_CAN_TFCR_TFUST_SHIFT; + if (priv->tx_head - priv->tx_tail <= unsent) + break; + stats->tx_packets++; + stats->tx_bytes += priv->tx_dlc[priv->tx_tail % + RCAR_CAN_FIFO_DEPTH]; + priv->tx_dlc[priv->tx_tail % RCAR_CAN_FIFO_DEPTH] = 0; + can_get_echo_skb(ndev, priv->tx_tail % RCAR_CAN_FIFO_DEPTH); + priv->tx_tail++; + netif_wake_queue(ndev); + } + /* Clear interrupt */ + isr = readb(&priv->regs->isr); + writeb(isr & ~RCAR_CAN_ISR_TXFF, &priv->regs->isr); + can_led_event(ndev, CAN_LED_EVENT_TX); +} + +static irqreturn_t rcar_can_interrupt(int irq, void *dev_id) +{ + struct net_device *ndev = dev_id; + struct rcar_can_priv *priv = netdev_priv(ndev); + u8 isr; + + isr = readb(&priv->regs->isr); + if (!(isr & priv->ier)) + return IRQ_NONE; + + if (isr & RCAR_CAN_ISR_ERSF) + rcar_can_error(ndev); + + if (isr & RCAR_CAN_ISR_TXFF) + rcar_can_tx_done(ndev); + + if (isr & RCAR_CAN_ISR_RXFF) { + if (napi_schedule_prep(&priv->napi)) { + /* Disable Rx FIFO interrupts */ + priv->ier &= ~RCAR_CAN_IER_RXFIE; + writeb(priv->ier, &priv->regs->ier); + __napi_schedule(&priv->napi); + } + } + + return IRQ_HANDLED; +} + +static void rcar_can_set_bittiming(struct net_device *dev) +{ + struct rcar_can_priv *priv = netdev_priv(dev); + struct can_bittiming *bt = &priv->can.bittiming; + u32 bcr; + + bcr = RCAR_CAN_BCR_TSEG1(bt->phase_seg1 + bt->prop_seg - 1) | + RCAR_CAN_BCR_BPR(bt->brp - 1) | RCAR_CAN_BCR_SJW(bt->sjw - 1) | + RCAR_CAN_BCR_TSEG2(bt->phase_seg2 - 1); + /* Don't overwrite CLKR with 32-bit BCR access; CLKR has 8-bit access. + * All the registers are big-endian but they get byte-swapped on 32-bit + * read/write (but not on 8-bit, contrary to the manuals)... + */ + writel((bcr << 8) | priv->clock_select, &priv->regs->bcr); +} + +static void rcar_can_start(struct net_device *ndev) +{ + struct rcar_can_priv *priv = netdev_priv(ndev); + u16 ctlr; + int i; + + /* Set controller to known mode: + * - FIFO mailbox mode + * - accept all messages + * - overrun mode + * CAN is in sleep mode after MCU hardware or software reset. + */ + ctlr = readw(&priv->regs->ctlr); + ctlr &= ~RCAR_CAN_CTLR_SLPM; + writew(ctlr, &priv->regs->ctlr); + /* Go to reset mode */ + ctlr |= RCAR_CAN_CTLR_CANM_FORCE_RESET; + writew(ctlr, &priv->regs->ctlr); + for (i = 0; i < MAX_STR_READS; i++) { + if (readw(&priv->regs->str) & RCAR_CAN_STR_RSTST) + break; + } + rcar_can_set_bittiming(ndev); + ctlr |= RCAR_CAN_CTLR_IDFM_MIXED; /* Select mixed ID mode */ + ctlr |= RCAR_CAN_CTLR_BOM_ENT; /* Entry to halt mode automatically */ + /* at bus-off */ + ctlr |= RCAR_CAN_CTLR_MBM; /* Select FIFO mailbox mode */ + ctlr |= RCAR_CAN_CTLR_MLM; /* Overrun mode */ + writew(ctlr, &priv->regs->ctlr); + + /* Accept all SID and EID */ + writel(0, &priv->regs->mkr_2_9[6]); + writel(0, &priv->regs->mkr_2_9[7]); + /* In FIFO mailbox mode, write "0" to bits 24 to 31 */ + writel(0, &priv->regs->mkivlr1); + /* Accept all frames */ + writel(0, &priv->regs->fidcr[0]); + writel(RCAR_CAN_FIDCR_IDE | RCAR_CAN_FIDCR_RTR, &priv->regs->fidcr[1]); + /* Enable and configure FIFO mailbox interrupts */ + writel(RCAR_CAN_MIER1_RXFIE | RCAR_CAN_MIER1_TXFIE, &priv->regs->mier1); + + priv->ier = RCAR_CAN_IER_ERSIE | RCAR_CAN_IER_RXFIE | + RCAR_CAN_IER_TXFIE; + writeb(priv->ier, &priv->regs->ier); + + /* Accumulate error codes */ + writeb(RCAR_CAN_ECSR_EDPM, &priv->regs->ecsr); + /* Enable error interrupts */ + writeb(RCAR_CAN_EIER_EWIE | RCAR_CAN_EIER_EPIE | RCAR_CAN_EIER_BOEIE | + (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING ? + RCAR_CAN_EIER_BEIE : 0) | RCAR_CAN_EIER_ORIE | + RCAR_CAN_EIER_OLIE, &priv->regs->eier); + priv->can.state = CAN_STATE_ERROR_ACTIVE; + + /* Go to operation mode */ + writew(ctlr & ~RCAR_CAN_CTLR_CANM, &priv->regs->ctlr); + for (i = 0; i < MAX_STR_READS; i++) { + if (!(readw(&priv->regs->str) & RCAR_CAN_STR_RSTST)) + break; + } + /* Enable Rx and Tx FIFO */ + writeb(RCAR_CAN_RFCR_RFE, &priv->regs->rfcr); + writeb(RCAR_CAN_TFCR_TFE, &priv->regs->tfcr); +} + +static int rcar_can_open(struct net_device *ndev) +{ + struct rcar_can_priv *priv = netdev_priv(ndev); + int err; + + err = clk_prepare_enable(priv->clk); + if (err) { + netdev_err(ndev, + "failed to enable peripheral clock, error %d\n", + err); + goto out; + } + err = clk_prepare_enable(priv->can_clk); + if (err) { + netdev_err(ndev, "failed to enable CAN clock, error %d\n", + err); + goto out_clock; + } + err = open_candev(ndev); + if (err) { + netdev_err(ndev, "open_candev() failed, error %d\n", err); + goto out_can_clock; + } + napi_enable(&priv->napi); + err = request_irq(ndev->irq, rcar_can_interrupt, 0, ndev->name, ndev); + if (err) { + netdev_err(ndev, "request_irq(%d) failed, error %d\n", + ndev->irq, err); + goto out_close; + } + can_led_event(ndev, CAN_LED_EVENT_OPEN); + rcar_can_start(ndev); + netif_start_queue(ndev); + return 0; +out_close: + napi_disable(&priv->napi); + close_candev(ndev); +out_can_clock: + clk_disable_unprepare(priv->can_clk); +out_clock: + clk_disable_unprepare(priv->clk); +out: + return err; +} + +static void rcar_can_stop(struct net_device *ndev) +{ + struct rcar_can_priv *priv = netdev_priv(ndev); + u16 ctlr; + int i; + + /* Go to (force) reset mode */ + ctlr = readw(&priv->regs->ctlr); + ctlr |= RCAR_CAN_CTLR_CANM_FORCE_RESET; + writew(ctlr, &priv->regs->ctlr); + for (i = 0; i < MAX_STR_READS; i++) { + if (readw(&priv->regs->str) & RCAR_CAN_STR_RSTST) + break; + } + writel(0, &priv->regs->mier0); + writel(0, &priv->regs->mier1); + writeb(0, &priv->regs->ier); + writeb(0, &priv->regs->eier); + /* Go to sleep mode */ + ctlr |= RCAR_CAN_CTLR_SLPM; + writew(ctlr, &priv->regs->ctlr); + priv->can.state = CAN_STATE_STOPPED; +} + +static int rcar_can_close(struct net_device *ndev) +{ + struct rcar_can_priv *priv = netdev_priv(ndev); + + netif_stop_queue(ndev); + rcar_can_stop(ndev); + free_irq(ndev->irq, ndev); + napi_disable(&priv->napi); + clk_disable_unprepare(priv->can_clk); + clk_disable_unprepare(priv->clk); + close_candev(ndev); + can_led_event(ndev, CAN_LED_EVENT_STOP); + return 0; +} + +static netdev_tx_t rcar_can_start_xmit(struct sk_buff *skb, + struct net_device *ndev) +{ + struct rcar_can_priv *priv = netdev_priv(ndev); + struct can_frame *cf = (struct can_frame *)skb->data; + u32 data, i; + + if (can_dropped_invalid_skb(ndev, skb)) + return NETDEV_TX_OK; + + if (cf->can_id & CAN_EFF_FLAG) /* Extended frame format */ + data = (cf->can_id & CAN_EFF_MASK) | RCAR_CAN_IDE; + else /* Standard frame format */ + data = (cf->can_id & CAN_SFF_MASK) << RCAR_CAN_SID_SHIFT; + + if (cf->can_id & CAN_RTR_FLAG) { /* Remote transmission request */ + data |= RCAR_CAN_RTR; + } else { + for (i = 0; i < cf->can_dlc; i++) + writeb(cf->data[i], + &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].data[i]); + } + + writel(data, &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].id); + + writeb(cf->can_dlc, &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].dlc); + + priv->tx_dlc[priv->tx_head % RCAR_CAN_FIFO_DEPTH] = cf->can_dlc; + can_put_echo_skb(skb, ndev, priv->tx_head % RCAR_CAN_FIFO_DEPTH); + priv->tx_head++; + /* Start Tx: write 0xff to the TFPCR register to increment + * the CPU-side pointer for the transmit FIFO to the next + * mailbox location + */ + writeb(0xff, &priv->regs->tfpcr); + /* Stop the queue if we've filled all FIFO entries */ + if (priv->tx_head - priv->tx_tail >= RCAR_CAN_FIFO_DEPTH) + netif_stop_queue(ndev); + + return NETDEV_TX_OK; +} + +static const struct net_device_ops rcar_can_netdev_ops = { + .ndo_open = rcar_can_open, + .ndo_stop = rcar_can_close, + .ndo_start_xmit = rcar_can_start_xmit, + .ndo_change_mtu = can_change_mtu, +}; + +static void rcar_can_rx_pkt(struct rcar_can_priv *priv) +{ + struct net_device_stats *stats = &priv->ndev->stats; + struct can_frame *cf; + struct sk_buff *skb; + u32 data; + u8 dlc; + + skb = alloc_can_skb(priv->ndev, &cf); + if (!skb) { + stats->rx_dropped++; + return; + } + + data = readl(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].id); + if (data & RCAR_CAN_IDE) + cf->can_id = (data & CAN_EFF_MASK) | CAN_EFF_FLAG; + else + cf->can_id = (data >> RCAR_CAN_SID_SHIFT) & CAN_SFF_MASK; + + dlc = readb(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].dlc); + cf->can_dlc = get_can_dlc(dlc); + if (data & RCAR_CAN_RTR) { + cf->can_id |= CAN_RTR_FLAG; + } else { + for (dlc = 0; dlc < cf->can_dlc; dlc++) + cf->data[dlc] = + readb(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].data[dlc]); + } + + can_led_event(priv->ndev, CAN_LED_EVENT_RX); + + stats->rx_bytes += cf->can_dlc; + stats->rx_packets++; + netif_receive_skb(skb); +} + +static int rcar_can_rx_poll(struct napi_struct *napi, int quota) +{ + struct rcar_can_priv *priv = container_of(napi, + struct rcar_can_priv, napi); + int num_pkts; + + for (num_pkts = 0; num_pkts < quota; num_pkts++) { + u8 rfcr, isr; + + isr = readb(&priv->regs->isr); + /* Clear interrupt bit */ + if (isr & RCAR_CAN_ISR_RXFF) + writeb(isr & ~RCAR_CAN_ISR_RXFF, &priv->regs->isr); + rfcr = readb(&priv->regs->rfcr); + if (rfcr & RCAR_CAN_RFCR_RFEST) + break; + rcar_can_rx_pkt(priv); + /* Write 0xff to the RFPCR register to increment + * the CPU-side pointer for the receive FIFO + * to the next mailbox location + */ + writeb(0xff, &priv->regs->rfpcr); + } + /* All packets processed */ + if (num_pkts < quota) { + napi_complete(napi); + priv->ier |= RCAR_CAN_IER_RXFIE; + writeb(priv->ier, &priv->regs->ier); + } + return num_pkts; +} + +static int rcar_can_do_set_mode(struct net_device *ndev, enum can_mode mode) +{ + switch (mode) { + case CAN_MODE_START: + rcar_can_start(ndev); + netif_wake_queue(ndev); + return 0; + default: + return -EOPNOTSUPP; + } +} + +static int rcar_can_get_berr_counter(const struct net_device *dev, + struct can_berr_counter *bec) +{ + struct rcar_can_priv *priv = netdev_priv(dev); + int err; + + err = clk_prepare_enable(priv->clk); + if (err) + return err; + bec->txerr = readb(&priv->regs->tecr); + bec->rxerr = readb(&priv->regs->recr); + clk_disable_unprepare(priv->clk); + return 0; +} + +static const char * const clock_names[] = { + [CLKR_CLKP1] = "clkp1", + [CLKR_CLKP2] = "clkp2", + [CLKR_CLKEXT] = "can_clk", +}; + +static int rcar_can_probe(struct platform_device *pdev) +{ + struct rcar_can_platform_data *pdata; + struct rcar_can_priv *priv; + struct net_device *ndev; + struct resource *mem; + void __iomem *addr; + u32 clock_select = CLKR_CLKP1; + int err = -ENODEV; + int irq; + + if (pdev->dev.of_node) { + of_property_read_u32(pdev->dev.of_node, + "renesas,can-clock-select", &clock_select); + } else { + pdata = dev_get_platdata(&pdev->dev); + if (!pdata) { + dev_err(&pdev->dev, "No platform data provided!\n"); + goto fail; + } + clock_select = pdata->clock_select; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "No IRQ resource\n"); + err = irq; + goto fail; + } + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + addr = devm_ioremap_resource(&pdev->dev, mem); + if (IS_ERR(addr)) { + err = PTR_ERR(addr); + goto fail; + } + + ndev = alloc_candev(sizeof(struct rcar_can_priv), RCAR_CAN_FIFO_DEPTH); + if (!ndev) { + dev_err(&pdev->dev, "alloc_candev() failed\n"); + err = -ENOMEM; + goto fail; + } + + priv = netdev_priv(ndev); + + priv->clk = devm_clk_get(&pdev->dev, "clkp1"); + if (IS_ERR(priv->clk)) { + err = PTR_ERR(priv->clk); + dev_err(&pdev->dev, "cannot get peripheral clock, error %d\n", + err); + goto fail_clk; + } + + if (clock_select >= ARRAY_SIZE(clock_names)) { + err = -EINVAL; + dev_err(&pdev->dev, "invalid CAN clock selected\n"); + goto fail_clk; + } + priv->can_clk = devm_clk_get(&pdev->dev, clock_names[clock_select]); + if (IS_ERR(priv->can_clk)) { + err = PTR_ERR(priv->can_clk); + dev_err(&pdev->dev, "cannot get CAN clock, error %d\n", err); + goto fail_clk; + } + + ndev->netdev_ops = &rcar_can_netdev_ops; + ndev->irq = irq; + ndev->flags |= IFF_ECHO; + priv->ndev = ndev; + priv->regs = addr; + priv->clock_select = clock_select; + priv->can.clock.freq = clk_get_rate(priv->can_clk); + priv->can.bittiming_const = &rcar_can_bittiming_const; + priv->can.do_set_mode = rcar_can_do_set_mode; + priv->can.do_get_berr_counter = rcar_can_get_berr_counter; + priv->can.ctrlmode_supported = CAN_CTRLMODE_BERR_REPORTING; + platform_set_drvdata(pdev, ndev); + SET_NETDEV_DEV(ndev, &pdev->dev); + + netif_napi_add(ndev, &priv->napi, rcar_can_rx_poll, + RCAR_CAN_NAPI_WEIGHT); + err = register_candev(ndev); + if (err) { + dev_err(&pdev->dev, "register_candev() failed, error %d\n", + err); + goto fail_candev; + } + + devm_can_led_init(ndev); + + dev_info(&pdev->dev, "device registered (regs @ %p, IRQ%d)\n", + priv->regs, ndev->irq); + + return 0; +fail_candev: + netif_napi_del(&priv->napi); +fail_clk: + free_candev(ndev); +fail: + return err; +} + +static int rcar_can_remove(struct platform_device *pdev) +{ + struct net_device *ndev = platform_get_drvdata(pdev); + struct rcar_can_priv *priv = netdev_priv(ndev); + + unregister_candev(ndev); + netif_napi_del(&priv->napi); + free_candev(ndev); + return 0; +} + +static int __maybe_unused rcar_can_suspend(struct device *dev) +{ + struct net_device *ndev = dev_get_drvdata(dev); + struct rcar_can_priv *priv = netdev_priv(ndev); + u16 ctlr; + + if (netif_running(ndev)) { + netif_stop_queue(ndev); + netif_device_detach(ndev); + } + ctlr = readw(&priv->regs->ctlr); + ctlr |= RCAR_CAN_CTLR_CANM_HALT; + writew(ctlr, &priv->regs->ctlr); + ctlr |= RCAR_CAN_CTLR_SLPM; + writew(ctlr, &priv->regs->ctlr); + priv->can.state = CAN_STATE_SLEEPING; + + clk_disable(priv->clk); + return 0; +} + +static int __maybe_unused rcar_can_resume(struct device *dev) +{ + struct net_device *ndev = dev_get_drvdata(dev); + struct rcar_can_priv *priv = netdev_priv(ndev); + u16 ctlr; + int err; + + err = clk_enable(priv->clk); + if (err) { + netdev_err(ndev, "clk_enable() failed, error %d\n", err); + return err; + } + + ctlr = readw(&priv->regs->ctlr); + ctlr &= ~RCAR_CAN_CTLR_SLPM; + writew(ctlr, &priv->regs->ctlr); + ctlr &= ~RCAR_CAN_CTLR_CANM; + writew(ctlr, &priv->regs->ctlr); + priv->can.state = CAN_STATE_ERROR_ACTIVE; + + if (netif_running(ndev)) { + netif_device_attach(ndev); + netif_start_queue(ndev); + } + return 0; +} + +static SIMPLE_DEV_PM_OPS(rcar_can_pm_ops, rcar_can_suspend, rcar_can_resume); + +static const struct of_device_id rcar_can_of_table[] __maybe_unused = { + { .compatible = "renesas,can-r8a7778" }, + { .compatible = "renesas,can-r8a7779" }, + { .compatible = "renesas,can-r8a7790" }, + { .compatible = "renesas,can-r8a7791" }, + { .compatible = "renesas,rcar-gen1-can" }, + { .compatible = "renesas,rcar-gen2-can" }, + { .compatible = "renesas,rcar-gen3-can" }, + { } +}; +MODULE_DEVICE_TABLE(of, rcar_can_of_table); + +static struct platform_driver rcar_can_driver = { + .driver = { + .name = RCAR_CAN_DRV_NAME, + .of_match_table = of_match_ptr(rcar_can_of_table), + .pm = &rcar_can_pm_ops, + }, + .probe = rcar_can_probe, + .remove = rcar_can_remove, +}; + +module_platform_driver(rcar_can_driver); + +MODULE_AUTHOR("Cogent Embedded, Inc."); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("CAN driver for Renesas R-Car SoC"); +MODULE_ALIAS("platform:" RCAR_CAN_DRV_NAME); diff --git a/drivers/net/can/rcar_can.c b/drivers/net/can/rcar_can.c deleted file mode 100644 index 788459f6bf5c..000000000000 --- a/drivers/net/can/rcar_can.c +++ /dev/null @@ -1,929 +0,0 @@ -/* Renesas R-Car CAN device driver - * - * Copyright (C) 2013 Cogent Embedded, Inc. - * Copyright (C) 2013 Renesas Solutions Corp. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#define RCAR_CAN_DRV_NAME "rcar_can" - -/* Mailbox configuration: - * mailbox 60 - 63 - Rx FIFO mailboxes - * mailbox 56 - 59 - Tx FIFO mailboxes - * non-FIFO mailboxes are not used - */ -#define RCAR_CAN_N_MBX 64 /* Number of mailboxes in non-FIFO mode */ -#define RCAR_CAN_RX_FIFO_MBX 60 /* Mailbox - window to Rx FIFO */ -#define RCAR_CAN_TX_FIFO_MBX 56 /* Mailbox - window to Tx FIFO */ -#define RCAR_CAN_FIFO_DEPTH 4 - -/* Mailbox registers structure */ -struct rcar_can_mbox_regs { - u32 id; /* IDE and RTR bits, SID and EID */ - u8 stub; /* Not used */ - u8 dlc; /* Data Length Code - bits [0..3] */ - u8 data[8]; /* Data Bytes */ - u8 tsh; /* Time Stamp Higher Byte */ - u8 tsl; /* Time Stamp Lower Byte */ -}; - -struct rcar_can_regs { - struct rcar_can_mbox_regs mb[RCAR_CAN_N_MBX]; /* Mailbox registers */ - u32 mkr_2_9[8]; /* Mask Registers 2-9 */ - u32 fidcr[2]; /* FIFO Received ID Compare Register */ - u32 mkivlr1; /* Mask Invalid Register 1 */ - u32 mier1; /* Mailbox Interrupt Enable Register 1 */ - u32 mkr_0_1[2]; /* Mask Registers 0-1 */ - u32 mkivlr0; /* Mask Invalid Register 0*/ - u32 mier0; /* Mailbox Interrupt Enable Register 0 */ - u8 pad_440[0x3c0]; - u8 mctl[64]; /* Message Control Registers */ - u16 ctlr; /* Control Register */ - u16 str; /* Status register */ - u8 bcr[3]; /* Bit Configuration Register */ - u8 clkr; /* Clock Select Register */ - u8 rfcr; /* Receive FIFO Control Register */ - u8 rfpcr; /* Receive FIFO Pointer Control Register */ - u8 tfcr; /* Transmit FIFO Control Register */ - u8 tfpcr; /* Transmit FIFO Pointer Control Register */ - u8 eier; /* Error Interrupt Enable Register */ - u8 eifr; /* Error Interrupt Factor Judge Register */ - u8 recr; /* Receive Error Count Register */ - u8 tecr; /* Transmit Error Count Register */ - u8 ecsr; /* Error Code Store Register */ - u8 cssr; /* Channel Search Support Register */ - u8 mssr; /* Mailbox Search Status Register */ - u8 msmr; /* Mailbox Search Mode Register */ - u16 tsr; /* Time Stamp Register */ - u8 afsr; /* Acceptance Filter Support Register */ - u8 pad_857; - u8 tcr; /* Test Control Register */ - u8 pad_859[7]; - u8 ier; /* Interrupt Enable Register */ - u8 isr; /* Interrupt Status Register */ - u8 pad_862; - u8 mbsmr; /* Mailbox Search Mask Register */ -}; - -struct rcar_can_priv { - struct can_priv can; /* Must be the first member! */ - struct net_device *ndev; - struct napi_struct napi; - struct rcar_can_regs __iomem *regs; - struct clk *clk; - struct clk *can_clk; - u8 tx_dlc[RCAR_CAN_FIFO_DEPTH]; - u32 tx_head; - u32 tx_tail; - u8 clock_select; - u8 ier; -}; - -static const struct can_bittiming_const rcar_can_bittiming_const = { - .name = RCAR_CAN_DRV_NAME, - .tseg1_min = 4, - .tseg1_max = 16, - .tseg2_min = 2, - .tseg2_max = 8, - .sjw_max = 4, - .brp_min = 1, - .brp_max = 1024, - .brp_inc = 1, -}; - -/* Control Register bits */ -#define RCAR_CAN_CTLR_BOM (3 << 11) /* Bus-Off Recovery Mode Bits */ -#define RCAR_CAN_CTLR_BOM_ENT (1 << 11) /* Entry to halt mode */ - /* at bus-off entry */ -#define RCAR_CAN_CTLR_SLPM (1 << 10) -#define RCAR_CAN_CTLR_CANM (3 << 8) /* Operating Mode Select Bit */ -#define RCAR_CAN_CTLR_CANM_HALT (1 << 9) -#define RCAR_CAN_CTLR_CANM_RESET (1 << 8) -#define RCAR_CAN_CTLR_CANM_FORCE_RESET (3 << 8) -#define RCAR_CAN_CTLR_MLM (1 << 3) /* Message Lost Mode Select */ -#define RCAR_CAN_CTLR_IDFM (3 << 1) /* ID Format Mode Select Bits */ -#define RCAR_CAN_CTLR_IDFM_MIXED (1 << 2) /* Mixed ID mode */ -#define RCAR_CAN_CTLR_MBM (1 << 0) /* Mailbox Mode select */ - -/* Status Register bits */ -#define RCAR_CAN_STR_RSTST (1 << 8) /* Reset Status Bit */ - -/* FIFO Received ID Compare Registers 0 and 1 bits */ -#define RCAR_CAN_FIDCR_IDE (1 << 31) /* ID Extension Bit */ -#define RCAR_CAN_FIDCR_RTR (1 << 30) /* Remote Transmission Request Bit */ - -/* Receive FIFO Control Register bits */ -#define RCAR_CAN_RFCR_RFEST (1 << 7) /* Receive FIFO Empty Status Flag */ -#define RCAR_CAN_RFCR_RFE (1 << 0) /* Receive FIFO Enable */ - -/* Transmit FIFO Control Register bits */ -#define RCAR_CAN_TFCR_TFUST (7 << 1) /* Transmit FIFO Unsent Message */ - /* Number Status Bits */ -#define RCAR_CAN_TFCR_TFUST_SHIFT 1 /* Offset of Transmit FIFO Unsent */ - /* Message Number Status Bits */ -#define RCAR_CAN_TFCR_TFE (1 << 0) /* Transmit FIFO Enable */ - -#define RCAR_CAN_N_RX_MKREGS1 2 /* Number of mask registers */ - /* for Rx mailboxes 0-31 */ -#define RCAR_CAN_N_RX_MKREGS2 8 - -/* Bit Configuration Register settings */ -#define RCAR_CAN_BCR_TSEG1(x) (((x) & 0x0f) << 20) -#define RCAR_CAN_BCR_BPR(x) (((x) & 0x3ff) << 8) -#define RCAR_CAN_BCR_SJW(x) (((x) & 0x3) << 4) -#define RCAR_CAN_BCR_TSEG2(x) ((x) & 0x07) - -/* Mailbox and Mask Registers bits */ -#define RCAR_CAN_IDE (1 << 31) -#define RCAR_CAN_RTR (1 << 30) -#define RCAR_CAN_SID_SHIFT 18 - -/* Mailbox Interrupt Enable Register 1 bits */ -#define RCAR_CAN_MIER1_RXFIE (1 << 28) /* Receive FIFO Interrupt Enable */ -#define RCAR_CAN_MIER1_TXFIE (1 << 24) /* Transmit FIFO Interrupt Enable */ - -/* Interrupt Enable Register bits */ -#define RCAR_CAN_IER_ERSIE (1 << 5) /* Error (ERS) Interrupt Enable Bit */ -#define RCAR_CAN_IER_RXFIE (1 << 4) /* Reception FIFO Interrupt */ - /* Enable Bit */ -#define RCAR_CAN_IER_TXFIE (1 << 3) /* Transmission FIFO Interrupt */ - /* Enable Bit */ -/* Interrupt Status Register bits */ -#define RCAR_CAN_ISR_ERSF (1 << 5) /* Error (ERS) Interrupt Status Bit */ -#define RCAR_CAN_ISR_RXFF (1 << 4) /* Reception FIFO Interrupt */ - /* Status Bit */ -#define RCAR_CAN_ISR_TXFF (1 << 3) /* Transmission FIFO Interrupt */ - /* Status Bit */ - -/* Error Interrupt Enable Register bits */ -#define RCAR_CAN_EIER_BLIE (1 << 7) /* Bus Lock Interrupt Enable */ -#define RCAR_CAN_EIER_OLIE (1 << 6) /* Overload Frame Transmit */ - /* Interrupt Enable */ -#define RCAR_CAN_EIER_ORIE (1 << 5) /* Receive Overrun Interrupt Enable */ -#define RCAR_CAN_EIER_BORIE (1 << 4) /* Bus-Off Recovery Interrupt Enable */ -#define RCAR_CAN_EIER_BOEIE (1 << 3) /* Bus-Off Entry Interrupt Enable */ -#define RCAR_CAN_EIER_EPIE (1 << 2) /* Error Passive Interrupt Enable */ -#define RCAR_CAN_EIER_EWIE (1 << 1) /* Error Warning Interrupt Enable */ -#define RCAR_CAN_EIER_BEIE (1 << 0) /* Bus Error Interrupt Enable */ - -/* Error Interrupt Factor Judge Register bits */ -#define RCAR_CAN_EIFR_BLIF (1 << 7) /* Bus Lock Detect Flag */ -#define RCAR_CAN_EIFR_OLIF (1 << 6) /* Overload Frame Transmission */ - /* Detect Flag */ -#define RCAR_CAN_EIFR_ORIF (1 << 5) /* Receive Overrun Detect Flag */ -#define RCAR_CAN_EIFR_BORIF (1 << 4) /* Bus-Off Recovery Detect Flag */ -#define RCAR_CAN_EIFR_BOEIF (1 << 3) /* Bus-Off Entry Detect Flag */ -#define RCAR_CAN_EIFR_EPIF (1 << 2) /* Error Passive Detect Flag */ -#define RCAR_CAN_EIFR_EWIF (1 << 1) /* Error Warning Detect Flag */ -#define RCAR_CAN_EIFR_BEIF (1 << 0) /* Bus Error Detect Flag */ - -/* Error Code Store Register bits */ -#define RCAR_CAN_ECSR_EDPM (1 << 7) /* Error Display Mode Select Bit */ -#define RCAR_CAN_ECSR_ADEF (1 << 6) /* ACK Delimiter Error Flag */ -#define RCAR_CAN_ECSR_BE0F (1 << 5) /* Bit Error (dominant) Flag */ -#define RCAR_CAN_ECSR_BE1F (1 << 4) /* Bit Error (recessive) Flag */ -#define RCAR_CAN_ECSR_CEF (1 << 3) /* CRC Error Flag */ -#define RCAR_CAN_ECSR_AEF (1 << 2) /* ACK Error Flag */ -#define RCAR_CAN_ECSR_FEF (1 << 1) /* Form Error Flag */ -#define RCAR_CAN_ECSR_SEF (1 << 0) /* Stuff Error Flag */ - -#define RCAR_CAN_NAPI_WEIGHT 4 -#define MAX_STR_READS 0x100 - -static void tx_failure_cleanup(struct net_device *ndev) -{ - int i; - - for (i = 0; i < RCAR_CAN_FIFO_DEPTH; i++) - can_free_echo_skb(ndev, i); -} - -static void rcar_can_error(struct net_device *ndev) -{ - struct rcar_can_priv *priv = netdev_priv(ndev); - struct net_device_stats *stats = &ndev->stats; - struct can_frame *cf; - struct sk_buff *skb; - u8 eifr, txerr = 0, rxerr = 0; - - /* Propagate the error condition to the CAN stack */ - skb = alloc_can_err_skb(ndev, &cf); - - eifr = readb(&priv->regs->eifr); - if (eifr & (RCAR_CAN_EIFR_EWIF | RCAR_CAN_EIFR_EPIF)) { - txerr = readb(&priv->regs->tecr); - rxerr = readb(&priv->regs->recr); - if (skb) { - cf->can_id |= CAN_ERR_CRTL; - cf->data[6] = txerr; - cf->data[7] = rxerr; - } - } - if (eifr & RCAR_CAN_EIFR_BEIF) { - int rx_errors = 0, tx_errors = 0; - u8 ecsr; - - netdev_dbg(priv->ndev, "Bus error interrupt:\n"); - if (skb) - cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT; - - ecsr = readb(&priv->regs->ecsr); - if (ecsr & RCAR_CAN_ECSR_ADEF) { - netdev_dbg(priv->ndev, "ACK Delimiter Error\n"); - tx_errors++; - writeb(~RCAR_CAN_ECSR_ADEF, &priv->regs->ecsr); - if (skb) - cf->data[3] = CAN_ERR_PROT_LOC_ACK_DEL; - } - if (ecsr & RCAR_CAN_ECSR_BE0F) { - netdev_dbg(priv->ndev, "Bit Error (dominant)\n"); - tx_errors++; - writeb(~RCAR_CAN_ECSR_BE0F, &priv->regs->ecsr); - if (skb) - cf->data[2] |= CAN_ERR_PROT_BIT0; - } - if (ecsr & RCAR_CAN_ECSR_BE1F) { - netdev_dbg(priv->ndev, "Bit Error (recessive)\n"); - tx_errors++; - writeb(~RCAR_CAN_ECSR_BE1F, &priv->regs->ecsr); - if (skb) - cf->data[2] |= CAN_ERR_PROT_BIT1; - } - if (ecsr & RCAR_CAN_ECSR_CEF) { - netdev_dbg(priv->ndev, "CRC Error\n"); - rx_errors++; - writeb(~RCAR_CAN_ECSR_CEF, &priv->regs->ecsr); - if (skb) - cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; - } - if (ecsr & RCAR_CAN_ECSR_AEF) { - netdev_dbg(priv->ndev, "ACK Error\n"); - tx_errors++; - writeb(~RCAR_CAN_ECSR_AEF, &priv->regs->ecsr); - if (skb) { - cf->can_id |= CAN_ERR_ACK; - cf->data[3] = CAN_ERR_PROT_LOC_ACK; - } - } - if (ecsr & RCAR_CAN_ECSR_FEF) { - netdev_dbg(priv->ndev, "Form Error\n"); - rx_errors++; - writeb(~RCAR_CAN_ECSR_FEF, &priv->regs->ecsr); - if (skb) - cf->data[2] |= CAN_ERR_PROT_FORM; - } - if (ecsr & RCAR_CAN_ECSR_SEF) { - netdev_dbg(priv->ndev, "Stuff Error\n"); - rx_errors++; - writeb(~RCAR_CAN_ECSR_SEF, &priv->regs->ecsr); - if (skb) - cf->data[2] |= CAN_ERR_PROT_STUFF; - } - - priv->can.can_stats.bus_error++; - ndev->stats.rx_errors += rx_errors; - ndev->stats.tx_errors += tx_errors; - writeb(~RCAR_CAN_EIFR_BEIF, &priv->regs->eifr); - } - if (eifr & RCAR_CAN_EIFR_EWIF) { - netdev_dbg(priv->ndev, "Error warning interrupt\n"); - priv->can.state = CAN_STATE_ERROR_WARNING; - priv->can.can_stats.error_warning++; - /* Clear interrupt condition */ - writeb(~RCAR_CAN_EIFR_EWIF, &priv->regs->eifr); - if (skb) - cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_WARNING : - CAN_ERR_CRTL_RX_WARNING; - } - if (eifr & RCAR_CAN_EIFR_EPIF) { - netdev_dbg(priv->ndev, "Error passive interrupt\n"); - priv->can.state = CAN_STATE_ERROR_PASSIVE; - priv->can.can_stats.error_passive++; - /* Clear interrupt condition */ - writeb(~RCAR_CAN_EIFR_EPIF, &priv->regs->eifr); - if (skb) - cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_PASSIVE : - CAN_ERR_CRTL_RX_PASSIVE; - } - if (eifr & RCAR_CAN_EIFR_BOEIF) { - netdev_dbg(priv->ndev, "Bus-off entry interrupt\n"); - tx_failure_cleanup(ndev); - priv->ier = RCAR_CAN_IER_ERSIE; - writeb(priv->ier, &priv->regs->ier); - priv->can.state = CAN_STATE_BUS_OFF; - /* Clear interrupt condition */ - writeb(~RCAR_CAN_EIFR_BOEIF, &priv->regs->eifr); - priv->can.can_stats.bus_off++; - can_bus_off(ndev); - if (skb) - cf->can_id |= CAN_ERR_BUSOFF; - } - if (eifr & RCAR_CAN_EIFR_ORIF) { - netdev_dbg(priv->ndev, "Receive overrun error interrupt\n"); - ndev->stats.rx_over_errors++; - ndev->stats.rx_errors++; - writeb(~RCAR_CAN_EIFR_ORIF, &priv->regs->eifr); - if (skb) { - cf->can_id |= CAN_ERR_CRTL; - cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; - } - } - if (eifr & RCAR_CAN_EIFR_OLIF) { - netdev_dbg(priv->ndev, - "Overload Frame Transmission error interrupt\n"); - ndev->stats.rx_over_errors++; - ndev->stats.rx_errors++; - writeb(~RCAR_CAN_EIFR_OLIF, &priv->regs->eifr); - if (skb) { - cf->can_id |= CAN_ERR_PROT; - cf->data[2] |= CAN_ERR_PROT_OVERLOAD; - } - } - - if (skb) { - stats->rx_packets++; - stats->rx_bytes += cf->can_dlc; - netif_rx(skb); - } -} - -static void rcar_can_tx_done(struct net_device *ndev) -{ - struct rcar_can_priv *priv = netdev_priv(ndev); - struct net_device_stats *stats = &ndev->stats; - u8 isr; - - while (1) { - u8 unsent = readb(&priv->regs->tfcr); - - unsent = (unsent & RCAR_CAN_TFCR_TFUST) >> - RCAR_CAN_TFCR_TFUST_SHIFT; - if (priv->tx_head - priv->tx_tail <= unsent) - break; - stats->tx_packets++; - stats->tx_bytes += priv->tx_dlc[priv->tx_tail % - RCAR_CAN_FIFO_DEPTH]; - priv->tx_dlc[priv->tx_tail % RCAR_CAN_FIFO_DEPTH] = 0; - can_get_echo_skb(ndev, priv->tx_tail % RCAR_CAN_FIFO_DEPTH); - priv->tx_tail++; - netif_wake_queue(ndev); - } - /* Clear interrupt */ - isr = readb(&priv->regs->isr); - writeb(isr & ~RCAR_CAN_ISR_TXFF, &priv->regs->isr); - can_led_event(ndev, CAN_LED_EVENT_TX); -} - -static irqreturn_t rcar_can_interrupt(int irq, void *dev_id) -{ - struct net_device *ndev = dev_id; - struct rcar_can_priv *priv = netdev_priv(ndev); - u8 isr; - - isr = readb(&priv->regs->isr); - if (!(isr & priv->ier)) - return IRQ_NONE; - - if (isr & RCAR_CAN_ISR_ERSF) - rcar_can_error(ndev); - - if (isr & RCAR_CAN_ISR_TXFF) - rcar_can_tx_done(ndev); - - if (isr & RCAR_CAN_ISR_RXFF) { - if (napi_schedule_prep(&priv->napi)) { - /* Disable Rx FIFO interrupts */ - priv->ier &= ~RCAR_CAN_IER_RXFIE; - writeb(priv->ier, &priv->regs->ier); - __napi_schedule(&priv->napi); - } - } - - return IRQ_HANDLED; -} - -static void rcar_can_set_bittiming(struct net_device *dev) -{ - struct rcar_can_priv *priv = netdev_priv(dev); - struct can_bittiming *bt = &priv->can.bittiming; - u32 bcr; - - bcr = RCAR_CAN_BCR_TSEG1(bt->phase_seg1 + bt->prop_seg - 1) | - RCAR_CAN_BCR_BPR(bt->brp - 1) | RCAR_CAN_BCR_SJW(bt->sjw - 1) | - RCAR_CAN_BCR_TSEG2(bt->phase_seg2 - 1); - /* Don't overwrite CLKR with 32-bit BCR access; CLKR has 8-bit access. - * All the registers are big-endian but they get byte-swapped on 32-bit - * read/write (but not on 8-bit, contrary to the manuals)... - */ - writel((bcr << 8) | priv->clock_select, &priv->regs->bcr); -} - -static void rcar_can_start(struct net_device *ndev) -{ - struct rcar_can_priv *priv = netdev_priv(ndev); - u16 ctlr; - int i; - - /* Set controller to known mode: - * - FIFO mailbox mode - * - accept all messages - * - overrun mode - * CAN is in sleep mode after MCU hardware or software reset. - */ - ctlr = readw(&priv->regs->ctlr); - ctlr &= ~RCAR_CAN_CTLR_SLPM; - writew(ctlr, &priv->regs->ctlr); - /* Go to reset mode */ - ctlr |= RCAR_CAN_CTLR_CANM_FORCE_RESET; - writew(ctlr, &priv->regs->ctlr); - for (i = 0; i < MAX_STR_READS; i++) { - if (readw(&priv->regs->str) & RCAR_CAN_STR_RSTST) - break; - } - rcar_can_set_bittiming(ndev); - ctlr |= RCAR_CAN_CTLR_IDFM_MIXED; /* Select mixed ID mode */ - ctlr |= RCAR_CAN_CTLR_BOM_ENT; /* Entry to halt mode automatically */ - /* at bus-off */ - ctlr |= RCAR_CAN_CTLR_MBM; /* Select FIFO mailbox mode */ - ctlr |= RCAR_CAN_CTLR_MLM; /* Overrun mode */ - writew(ctlr, &priv->regs->ctlr); - - /* Accept all SID and EID */ - writel(0, &priv->regs->mkr_2_9[6]); - writel(0, &priv->regs->mkr_2_9[7]); - /* In FIFO mailbox mode, write "0" to bits 24 to 31 */ - writel(0, &priv->regs->mkivlr1); - /* Accept all frames */ - writel(0, &priv->regs->fidcr[0]); - writel(RCAR_CAN_FIDCR_IDE | RCAR_CAN_FIDCR_RTR, &priv->regs->fidcr[1]); - /* Enable and configure FIFO mailbox interrupts */ - writel(RCAR_CAN_MIER1_RXFIE | RCAR_CAN_MIER1_TXFIE, &priv->regs->mier1); - - priv->ier = RCAR_CAN_IER_ERSIE | RCAR_CAN_IER_RXFIE | - RCAR_CAN_IER_TXFIE; - writeb(priv->ier, &priv->regs->ier); - - /* Accumulate error codes */ - writeb(RCAR_CAN_ECSR_EDPM, &priv->regs->ecsr); - /* Enable error interrupts */ - writeb(RCAR_CAN_EIER_EWIE | RCAR_CAN_EIER_EPIE | RCAR_CAN_EIER_BOEIE | - (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING ? - RCAR_CAN_EIER_BEIE : 0) | RCAR_CAN_EIER_ORIE | - RCAR_CAN_EIER_OLIE, &priv->regs->eier); - priv->can.state = CAN_STATE_ERROR_ACTIVE; - - /* Go to operation mode */ - writew(ctlr & ~RCAR_CAN_CTLR_CANM, &priv->regs->ctlr); - for (i = 0; i < MAX_STR_READS; i++) { - if (!(readw(&priv->regs->str) & RCAR_CAN_STR_RSTST)) - break; - } - /* Enable Rx and Tx FIFO */ - writeb(RCAR_CAN_RFCR_RFE, &priv->regs->rfcr); - writeb(RCAR_CAN_TFCR_TFE, &priv->regs->tfcr); -} - -static int rcar_can_open(struct net_device *ndev) -{ - struct rcar_can_priv *priv = netdev_priv(ndev); - int err; - - err = clk_prepare_enable(priv->clk); - if (err) { - netdev_err(ndev, - "failed to enable peripheral clock, error %d\n", - err); - goto out; - } - err = clk_prepare_enable(priv->can_clk); - if (err) { - netdev_err(ndev, "failed to enable CAN clock, error %d\n", - err); - goto out_clock; - } - err = open_candev(ndev); - if (err) { - netdev_err(ndev, "open_candev() failed, error %d\n", err); - goto out_can_clock; - } - napi_enable(&priv->napi); - err = request_irq(ndev->irq, rcar_can_interrupt, 0, ndev->name, ndev); - if (err) { - netdev_err(ndev, "request_irq(%d) failed, error %d\n", - ndev->irq, err); - goto out_close; - } - can_led_event(ndev, CAN_LED_EVENT_OPEN); - rcar_can_start(ndev); - netif_start_queue(ndev); - return 0; -out_close: - napi_disable(&priv->napi); - close_candev(ndev); -out_can_clock: - clk_disable_unprepare(priv->can_clk); -out_clock: - clk_disable_unprepare(priv->clk); -out: - return err; -} - -static void rcar_can_stop(struct net_device *ndev) -{ - struct rcar_can_priv *priv = netdev_priv(ndev); - u16 ctlr; - int i; - - /* Go to (force) reset mode */ - ctlr = readw(&priv->regs->ctlr); - ctlr |= RCAR_CAN_CTLR_CANM_FORCE_RESET; - writew(ctlr, &priv->regs->ctlr); - for (i = 0; i < MAX_STR_READS; i++) { - if (readw(&priv->regs->str) & RCAR_CAN_STR_RSTST) - break; - } - writel(0, &priv->regs->mier0); - writel(0, &priv->regs->mier1); - writeb(0, &priv->regs->ier); - writeb(0, &priv->regs->eier); - /* Go to sleep mode */ - ctlr |= RCAR_CAN_CTLR_SLPM; - writew(ctlr, &priv->regs->ctlr); - priv->can.state = CAN_STATE_STOPPED; -} - -static int rcar_can_close(struct net_device *ndev) -{ - struct rcar_can_priv *priv = netdev_priv(ndev); - - netif_stop_queue(ndev); - rcar_can_stop(ndev); - free_irq(ndev->irq, ndev); - napi_disable(&priv->napi); - clk_disable_unprepare(priv->can_clk); - clk_disable_unprepare(priv->clk); - close_candev(ndev); - can_led_event(ndev, CAN_LED_EVENT_STOP); - return 0; -} - -static netdev_tx_t rcar_can_start_xmit(struct sk_buff *skb, - struct net_device *ndev) -{ - struct rcar_can_priv *priv = netdev_priv(ndev); - struct can_frame *cf = (struct can_frame *)skb->data; - u32 data, i; - - if (can_dropped_invalid_skb(ndev, skb)) - return NETDEV_TX_OK; - - if (cf->can_id & CAN_EFF_FLAG) /* Extended frame format */ - data = (cf->can_id & CAN_EFF_MASK) | RCAR_CAN_IDE; - else /* Standard frame format */ - data = (cf->can_id & CAN_SFF_MASK) << RCAR_CAN_SID_SHIFT; - - if (cf->can_id & CAN_RTR_FLAG) { /* Remote transmission request */ - data |= RCAR_CAN_RTR; - } else { - for (i = 0; i < cf->can_dlc; i++) - writeb(cf->data[i], - &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].data[i]); - } - - writel(data, &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].id); - - writeb(cf->can_dlc, &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].dlc); - - priv->tx_dlc[priv->tx_head % RCAR_CAN_FIFO_DEPTH] = cf->can_dlc; - can_put_echo_skb(skb, ndev, priv->tx_head % RCAR_CAN_FIFO_DEPTH); - priv->tx_head++; - /* Start Tx: write 0xff to the TFPCR register to increment - * the CPU-side pointer for the transmit FIFO to the next - * mailbox location - */ - writeb(0xff, &priv->regs->tfpcr); - /* Stop the queue if we've filled all FIFO entries */ - if (priv->tx_head - priv->tx_tail >= RCAR_CAN_FIFO_DEPTH) - netif_stop_queue(ndev); - - return NETDEV_TX_OK; -} - -static const struct net_device_ops rcar_can_netdev_ops = { - .ndo_open = rcar_can_open, - .ndo_stop = rcar_can_close, - .ndo_start_xmit = rcar_can_start_xmit, - .ndo_change_mtu = can_change_mtu, -}; - -static void rcar_can_rx_pkt(struct rcar_can_priv *priv) -{ - struct net_device_stats *stats = &priv->ndev->stats; - struct can_frame *cf; - struct sk_buff *skb; - u32 data; - u8 dlc; - - skb = alloc_can_skb(priv->ndev, &cf); - if (!skb) { - stats->rx_dropped++; - return; - } - - data = readl(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].id); - if (data & RCAR_CAN_IDE) - cf->can_id = (data & CAN_EFF_MASK) | CAN_EFF_FLAG; - else - cf->can_id = (data >> RCAR_CAN_SID_SHIFT) & CAN_SFF_MASK; - - dlc = readb(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].dlc); - cf->can_dlc = get_can_dlc(dlc); - if (data & RCAR_CAN_RTR) { - cf->can_id |= CAN_RTR_FLAG; - } else { - for (dlc = 0; dlc < cf->can_dlc; dlc++) - cf->data[dlc] = - readb(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].data[dlc]); - } - - can_led_event(priv->ndev, CAN_LED_EVENT_RX); - - stats->rx_bytes += cf->can_dlc; - stats->rx_packets++; - netif_receive_skb(skb); -} - -static int rcar_can_rx_poll(struct napi_struct *napi, int quota) -{ - struct rcar_can_priv *priv = container_of(napi, - struct rcar_can_priv, napi); - int num_pkts; - - for (num_pkts = 0; num_pkts < quota; num_pkts++) { - u8 rfcr, isr; - - isr = readb(&priv->regs->isr); - /* Clear interrupt bit */ - if (isr & RCAR_CAN_ISR_RXFF) - writeb(isr & ~RCAR_CAN_ISR_RXFF, &priv->regs->isr); - rfcr = readb(&priv->regs->rfcr); - if (rfcr & RCAR_CAN_RFCR_RFEST) - break; - rcar_can_rx_pkt(priv); - /* Write 0xff to the RFPCR register to increment - * the CPU-side pointer for the receive FIFO - * to the next mailbox location - */ - writeb(0xff, &priv->regs->rfpcr); - } - /* All packets processed */ - if (num_pkts < quota) { - napi_complete(napi); - priv->ier |= RCAR_CAN_IER_RXFIE; - writeb(priv->ier, &priv->regs->ier); - } - return num_pkts; -} - -static int rcar_can_do_set_mode(struct net_device *ndev, enum can_mode mode) -{ - switch (mode) { - case CAN_MODE_START: - rcar_can_start(ndev); - netif_wake_queue(ndev); - return 0; - default: - return -EOPNOTSUPP; - } -} - -static int rcar_can_get_berr_counter(const struct net_device *dev, - struct can_berr_counter *bec) -{ - struct rcar_can_priv *priv = netdev_priv(dev); - int err; - - err = clk_prepare_enable(priv->clk); - if (err) - return err; - bec->txerr = readb(&priv->regs->tecr); - bec->rxerr = readb(&priv->regs->recr); - clk_disable_unprepare(priv->clk); - return 0; -} - -static const char * const clock_names[] = { - [CLKR_CLKP1] = "clkp1", - [CLKR_CLKP2] = "clkp2", - [CLKR_CLKEXT] = "can_clk", -}; - -static int rcar_can_probe(struct platform_device *pdev) -{ - struct rcar_can_platform_data *pdata; - struct rcar_can_priv *priv; - struct net_device *ndev; - struct resource *mem; - void __iomem *addr; - u32 clock_select = CLKR_CLKP1; - int err = -ENODEV; - int irq; - - if (pdev->dev.of_node) { - of_property_read_u32(pdev->dev.of_node, - "renesas,can-clock-select", &clock_select); - } else { - pdata = dev_get_platdata(&pdev->dev); - if (!pdata) { - dev_err(&pdev->dev, "No platform data provided!\n"); - goto fail; - } - clock_select = pdata->clock_select; - } - - irq = platform_get_irq(pdev, 0); - if (irq < 0) { - dev_err(&pdev->dev, "No IRQ resource\n"); - err = irq; - goto fail; - } - - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - addr = devm_ioremap_resource(&pdev->dev, mem); - if (IS_ERR(addr)) { - err = PTR_ERR(addr); - goto fail; - } - - ndev = alloc_candev(sizeof(struct rcar_can_priv), RCAR_CAN_FIFO_DEPTH); - if (!ndev) { - dev_err(&pdev->dev, "alloc_candev() failed\n"); - err = -ENOMEM; - goto fail; - } - - priv = netdev_priv(ndev); - - priv->clk = devm_clk_get(&pdev->dev, "clkp1"); - if (IS_ERR(priv->clk)) { - err = PTR_ERR(priv->clk); - dev_err(&pdev->dev, "cannot get peripheral clock, error %d\n", - err); - goto fail_clk; - } - - if (clock_select >= ARRAY_SIZE(clock_names)) { - err = -EINVAL; - dev_err(&pdev->dev, "invalid CAN clock selected\n"); - goto fail_clk; - } - priv->can_clk = devm_clk_get(&pdev->dev, clock_names[clock_select]); - if (IS_ERR(priv->can_clk)) { - err = PTR_ERR(priv->can_clk); - dev_err(&pdev->dev, "cannot get CAN clock, error %d\n", err); - goto fail_clk; - } - - ndev->netdev_ops = &rcar_can_netdev_ops; - ndev->irq = irq; - ndev->flags |= IFF_ECHO; - priv->ndev = ndev; - priv->regs = addr; - priv->clock_select = clock_select; - priv->can.clock.freq = clk_get_rate(priv->can_clk); - priv->can.bittiming_const = &rcar_can_bittiming_const; - priv->can.do_set_mode = rcar_can_do_set_mode; - priv->can.do_get_berr_counter = rcar_can_get_berr_counter; - priv->can.ctrlmode_supported = CAN_CTRLMODE_BERR_REPORTING; - platform_set_drvdata(pdev, ndev); - SET_NETDEV_DEV(ndev, &pdev->dev); - - netif_napi_add(ndev, &priv->napi, rcar_can_rx_poll, - RCAR_CAN_NAPI_WEIGHT); - err = register_candev(ndev); - if (err) { - dev_err(&pdev->dev, "register_candev() failed, error %d\n", - err); - goto fail_candev; - } - - devm_can_led_init(ndev); - - dev_info(&pdev->dev, "device registered (regs @ %p, IRQ%d)\n", - priv->regs, ndev->irq); - - return 0; -fail_candev: - netif_napi_del(&priv->napi); -fail_clk: - free_candev(ndev); -fail: - return err; -} - -static int rcar_can_remove(struct platform_device *pdev) -{ - struct net_device *ndev = platform_get_drvdata(pdev); - struct rcar_can_priv *priv = netdev_priv(ndev); - - unregister_candev(ndev); - netif_napi_del(&priv->napi); - free_candev(ndev); - return 0; -} - -static int __maybe_unused rcar_can_suspend(struct device *dev) -{ - struct net_device *ndev = dev_get_drvdata(dev); - struct rcar_can_priv *priv = netdev_priv(ndev); - u16 ctlr; - - if (netif_running(ndev)) { - netif_stop_queue(ndev); - netif_device_detach(ndev); - } - ctlr = readw(&priv->regs->ctlr); - ctlr |= RCAR_CAN_CTLR_CANM_HALT; - writew(ctlr, &priv->regs->ctlr); - ctlr |= RCAR_CAN_CTLR_SLPM; - writew(ctlr, &priv->regs->ctlr); - priv->can.state = CAN_STATE_SLEEPING; - - clk_disable(priv->clk); - return 0; -} - -static int __maybe_unused rcar_can_resume(struct device *dev) -{ - struct net_device *ndev = dev_get_drvdata(dev); - struct rcar_can_priv *priv = netdev_priv(ndev); - u16 ctlr; - int err; - - err = clk_enable(priv->clk); - if (err) { - netdev_err(ndev, "clk_enable() failed, error %d\n", err); - return err; - } - - ctlr = readw(&priv->regs->ctlr); - ctlr &= ~RCAR_CAN_CTLR_SLPM; - writew(ctlr, &priv->regs->ctlr); - ctlr &= ~RCAR_CAN_CTLR_CANM; - writew(ctlr, &priv->regs->ctlr); - priv->can.state = CAN_STATE_ERROR_ACTIVE; - - if (netif_running(ndev)) { - netif_device_attach(ndev); - netif_start_queue(ndev); - } - return 0; -} - -static SIMPLE_DEV_PM_OPS(rcar_can_pm_ops, rcar_can_suspend, rcar_can_resume); - -static const struct of_device_id rcar_can_of_table[] __maybe_unused = { - { .compatible = "renesas,can-r8a7778" }, - { .compatible = "renesas,can-r8a7779" }, - { .compatible = "renesas,can-r8a7790" }, - { .compatible = "renesas,can-r8a7791" }, - { .compatible = "renesas,rcar-gen1-can" }, - { .compatible = "renesas,rcar-gen2-can" }, - { .compatible = "renesas,rcar-gen3-can" }, - { } -}; -MODULE_DEVICE_TABLE(of, rcar_can_of_table); - -static struct platform_driver rcar_can_driver = { - .driver = { - .name = RCAR_CAN_DRV_NAME, - .of_match_table = of_match_ptr(rcar_can_of_table), - .pm = &rcar_can_pm_ops, - }, - .probe = rcar_can_probe, - .remove = rcar_can_remove, -}; - -module_platform_driver(rcar_can_driver); - -MODULE_AUTHOR("Cogent Embedded, Inc."); -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("CAN driver for Renesas R-Car SoC"); -MODULE_ALIAS("platform:" RCAR_CAN_DRV_NAME); -- cgit v1.2.3