diff options
Diffstat (limited to 'drivers/net/can')
| -rw-r--r-- | drivers/net/can/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/net/can/Makefile | 1 | ||||
| -rw-r--r-- | drivers/net/can/flexcan.c | 1030 | ||||
| -rw-r--r-- | drivers/net/can/mscan/mscan.h | 2 | ||||
| -rw-r--r-- | drivers/net/can/usb/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/net/can/usb/Makefile | 1 | ||||
| -rw-r--r-- | drivers/net/can/usb/ems_usb.c | 2 | ||||
| -rw-r--r-- | drivers/net/can/usb/esd_usb2.c | 1132 |
8 files changed, 2181 insertions, 2 deletions
diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig index 2c5227c02fa..9d9e4539443 100644 --- a/drivers/net/can/Kconfig +++ b/drivers/net/can/Kconfig @@ -73,6 +73,15 @@ config CAN_JANZ_ICAN3 This driver can also be built as a module. If so, the module will be called janz-ican3.ko. +config HAVE_CAN_FLEXCAN + bool + +config CAN_FLEXCAN + tristate "Support for Freescale FLEXCAN based chips" + depends on CAN_DEV && HAVE_CAN_FLEXCAN + ---help--- + Say Y here if you want to support for Freescale FlexCAN. + source "drivers/net/can/mscan/Kconfig" source "drivers/net/can/sja1000/Kconfig" diff --git a/drivers/net/can/Makefile b/drivers/net/can/Makefile index 9047cd066fe..00575373bbd 100644 --- a/drivers/net/can/Makefile +++ b/drivers/net/can/Makefile @@ -16,5 +16,6 @@ obj-$(CONFIG_CAN_TI_HECC) += ti_hecc.o obj-$(CONFIG_CAN_MCP251X) += mcp251x.o obj-$(CONFIG_CAN_BFIN) += bfin_can.o obj-$(CONFIG_CAN_JANZ_ICAN3) += janz-ican3.o +obj-$(CONFIG_CAN_FLEXCAN) += flexcan.o ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c new file mode 100644 index 00000000000..ef443a090ba --- /dev/null +++ b/drivers/net/can/flexcan.c @@ -0,0 +1,1030 @@ +/* + * flexcan.c - FLEXCAN CAN controller driver + * + * Copyright (c) 2005-2006 Varma Electronics Oy + * Copyright (c) 2009 Sascha Hauer, Pengutronix + * Copyright (c) 2010 Marc Kleine-Budde, Pengutronix + * + * Based on code originally by Andrey Volkov <avolkov@varma-el.com> + * + * LICENCE: + * 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 version 2. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/netdevice.h> +#include <linux/can.h> +#include <linux/can/dev.h> +#include <linux/can/error.h> +#include <linux/can/platform/flexcan.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +#include <mach/clock.h> + +#define DRV_NAME "flexcan" + +/* 8 for RX fifo and 2 error handling */ +#define FLEXCAN_NAPI_WEIGHT (8 + 2) + +/* FLEXCAN module configuration register (CANMCR) bits */ +#define FLEXCAN_MCR_MDIS BIT(31) +#define FLEXCAN_MCR_FRZ BIT(30) +#define FLEXCAN_MCR_FEN BIT(29) +#define FLEXCAN_MCR_HALT BIT(28) +#define FLEXCAN_MCR_NOT_RDY BIT(27) +#define FLEXCAN_MCR_WAK_MSK BIT(26) +#define FLEXCAN_MCR_SOFTRST BIT(25) +#define FLEXCAN_MCR_FRZ_ACK BIT(24) +#define FLEXCAN_MCR_SUPV BIT(23) +#define FLEXCAN_MCR_SLF_WAK BIT(22) +#define FLEXCAN_MCR_WRN_EN BIT(21) +#define FLEXCAN_MCR_LPM_ACK BIT(20) +#define FLEXCAN_MCR_WAK_SRC BIT(19) +#define FLEXCAN_MCR_DOZE BIT(18) +#define FLEXCAN_MCR_SRX_DIS BIT(17) +#define FLEXCAN_MCR_BCC BIT(16) +#define FLEXCAN_MCR_LPRIO_EN BIT(13) +#define FLEXCAN_MCR_AEN BIT(12) +#define FLEXCAN_MCR_MAXMB(x) ((x) & 0xf) +#define FLEXCAN_MCR_IDAM_A (0 << 8) +#define FLEXCAN_MCR_IDAM_B (1 << 8) +#define FLEXCAN_MCR_IDAM_C (2 << 8) +#define FLEXCAN_MCR_IDAM_D (3 << 8) + +/* FLEXCAN control register (CANCTRL) bits */ +#define FLEXCAN_CTRL_PRESDIV(x) (((x) & 0xff) << 24) +#define FLEXCAN_CTRL_RJW(x) (((x) & 0x03) << 22) +#define FLEXCAN_CTRL_PSEG1(x) (((x) & 0x07) << 19) +#define FLEXCAN_CTRL_PSEG2(x) (((x) & 0x07) << 16) +#define FLEXCAN_CTRL_BOFF_MSK BIT(15) +#define FLEXCAN_CTRL_ERR_MSK BIT(14) +#define FLEXCAN_CTRL_CLK_SRC BIT(13) +#define FLEXCAN_CTRL_LPB BIT(12) +#define FLEXCAN_CTRL_TWRN_MSK BIT(11) +#define FLEXCAN_CTRL_RWRN_MSK BIT(10) +#define FLEXCAN_CTRL_SMP BIT(7) +#define FLEXCAN_CTRL_BOFF_REC BIT(6) +#define FLEXCAN_CTRL_TSYN BIT(5) +#define FLEXCAN_CTRL_LBUF BIT(4) +#define FLEXCAN_CTRL_LOM BIT(3) +#define FLEXCAN_CTRL_PROPSEG(x) ((x) & 0x07) +#define FLEXCAN_CTRL_ERR_BUS (FLEXCAN_CTRL_ERR_MSK) +#define FLEXCAN_CTRL_ERR_STATE \ + (FLEXCAN_CTRL_TWRN_MSK | FLEXCAN_CTRL_RWRN_MSK | \ + FLEXCAN_CTRL_BOFF_MSK) +#define FLEXCAN_CTRL_ERR_ALL \ + (FLEXCAN_CTRL_ERR_BUS | FLEXCAN_CTRL_ERR_STATE) + +/* FLEXCAN error and status register (ESR) bits */ +#define FLEXCAN_ESR_TWRN_INT BIT(17) +#define FLEXCAN_ESR_RWRN_INT BIT(16) +#define FLEXCAN_ESR_BIT1_ERR BIT(15) +#define FLEXCAN_ESR_BIT0_ERR BIT(14) +#define FLEXCAN_ESR_ACK_ERR BIT(13) +#define FLEXCAN_ESR_CRC_ERR BIT(12) +#define FLEXCAN_ESR_FRM_ERR BIT(11) +#define FLEXCAN_ESR_STF_ERR BIT(10) +#define FLEXCAN_ESR_TX_WRN BIT(9) +#define FLEXCAN_ESR_RX_WRN BIT(8) +#define FLEXCAN_ESR_IDLE BIT(7) +#define FLEXCAN_ESR_TXRX BIT(6) +#define FLEXCAN_EST_FLT_CONF_SHIFT (4) +#define FLEXCAN_ESR_FLT_CONF_MASK (0x3 << FLEXCAN_EST_FLT_CONF_SHIFT) +#define FLEXCAN_ESR_FLT_CONF_ACTIVE (0x0 << FLEXCAN_EST_FLT_CONF_SHIFT) +#define FLEXCAN_ESR_FLT_CONF_PASSIVE (0x1 << FLEXCAN_EST_FLT_CONF_SHIFT) +#define FLEXCAN_ESR_BOFF_INT BIT(2) +#define FLEXCAN_ESR_ERR_INT BIT(1) +#define FLEXCAN_ESR_WAK_INT BIT(0) +#define FLEXCAN_ESR_ERR_BUS \ + (FLEXCAN_ESR_BIT1_ERR | FLEXCAN_ESR_BIT0_ERR | \ + FLEXCAN_ESR_ACK_ERR | FLEXCAN_ESR_CRC_ERR | \ + FLEXCAN_ESR_FRM_ERR | FLEXCAN_ESR_STF_ERR) +#define FLEXCAN_ESR_ERR_STATE \ + (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | FLEXCAN_ESR_BOFF_INT) +#define FLEXCAN_ESR_ERR_ALL \ + (FLEXCAN_ESR_ERR_BUS | FLEXCAN_ESR_ERR_STATE) + +/* FLEXCAN interrupt flag register (IFLAG) bits */ +#define FLEXCAN_TX_BUF_ID 8 +#define FLEXCAN_IFLAG_BUF(x) BIT(x) +#define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7) +#define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6) +#define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE BIT(5) +#define FLEXCAN_IFLAG_DEFAULT \ + (FLEXCAN_IFLAG_RX_FIFO_OVERFLOW | FLEXCAN_IFLAG_RX_FIFO_AVAILABLE | \ + FLEXCAN_IFLAG_BUF(FLEXCAN_TX_BUF_ID)) + +/* FLEXCAN message buffers */ +#define FLEXCAN_MB_CNT_CODE(x) (((x) & 0xf) << 24) +#define FLEXCAN_MB_CNT_SRR BIT(22) +#define FLEXCAN_MB_CNT_IDE BIT(21) +#define FLEXCAN_MB_CNT_RTR BIT(20) +#define FLEXCAN_MB_CNT_LENGTH(x) (((x) & 0xf) << 16) +#define FLEXCAN_MB_CNT_TIMESTAMP(x) ((x) & 0xffff) + +#define FLEXCAN_MB_CODE_MASK (0xf0ffffff) + +/* Structure of the message buffer */ +struct flexcan_mb { + u32 can_ctrl; + u32 can_id; + u32 data[2]; +}; + +/* Structure of the hardware registers */ +struct flexcan_regs { + u32 mcr; /* 0x00 */ + u32 ctrl; /* 0x04 */ + u32 timer; /* 0x08 */ + u32 _reserved1; /* 0x0c */ + u32 rxgmask; /* 0x10 */ + u32 rx14mask; /* 0x14 */ + u32 rx15mask; /* 0x18 */ + u32 ecr; /* 0x1c */ + u32 esr; /* 0x20 */ + u32 imask2; /* 0x24 */ + u32 imask1; /* 0x28 */ + u32 iflag2; /* 0x2c */ + u32 iflag1; /* 0x30 */ + u32 _reserved2[19]; + struct flexcan_mb cantxfg[64]; +}; + +struct flexcan_priv { + struct can_priv can; + struct net_device *dev; + struct napi_struct napi; + + void __iomem *base; + u32 reg_esr; + u32 reg_ctrl_default; + + struct clk *clk; + struct flexcan_platform_data *pdata; +}; + +static struct can_bittiming_const flexcan_bittiming_const = { + .name = DRV_NAME, + .tseg1_min = 4, + .tseg1_max = 16, + .tseg2_min = 2, + .tseg2_max = 8, + .sjw_max = 4, + .brp_min = 1, + .brp_max = 256, + .brp_inc = 1, +}; + +/* + * Swtich transceiver on or off + */ +static void flexcan_transceiver_switch(const struct flexcan_priv *priv, int on) +{ + if (priv->pdata && priv->pdata->transceiver_switch) + priv->pdata->transceiver_switch(on); +} + +static inline int flexcan_has_and_handle_berr(const struct flexcan_priv *priv, + u32 reg_esr) +{ + return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) && + (reg_esr & FLEXCAN_ESR_ERR_BUS); +} + +static inline void flexcan_chip_enable(struct flexcan_priv *priv) +{ + struct flexcan_regs __iomem *regs = priv->base; + u32 reg; + + reg = readl(®s->mcr); + reg &= ~FLEXCAN_MCR_MDIS; + writel(reg, ®s->mcr); + + udelay(10); +} + +static inline void flexcan_chip_disable(struct flexcan_priv *priv) +{ + struct flexcan_regs __iomem *regs = priv->base; + u32 reg; + + reg = readl(®s->mcr); + reg |= FLEXCAN_MCR_MDIS; + writel(reg, ®s->mcr); +} + +static int flexcan_get_berr_counter(const struct net_device *dev, + struct can_berr_counter *bec) +{ + const struct flexcan_priv *priv = netdev_priv(dev); + struct flexcan_regs __iomem *regs = priv->base; + u32 reg = readl(®s->ecr); + + bec->txerr = (reg >> 0) & 0xff; + bec->rxerr = (reg >> 8) & 0xff; + + return 0; +} + +static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + const struct flexcan_priv *priv = netdev_priv(dev); + struct net_device_stats *stats = &dev->stats; + struct flexcan_regs __iomem *regs = priv->base; + struct can_frame *cf = (struct can_frame *)skb->data; + u32 can_id; + u32 ctrl = FLEXCAN_MB_CNT_CODE(0xc) | (cf->can_dlc << 16); + + if (can_dropped_invalid_skb(dev, skb)) + return NETDEV_TX_OK; + + netif_stop_queue(dev); + + if (cf->can_id & CAN_EFF_FLAG) { + can_id = cf->can_id & CAN_EFF_MASK; + ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR; + } else { + can_id = (cf->can_id & CAN_SFF_MASK) << 18; + } + + if (cf->can_id & CAN_RTR_FLAG) + ctrl |= FLEXCAN_MB_CNT_RTR; + + if (cf->can_dlc > 0) { + u32 data = be32_to_cpup((__be32 *)&cf->data[0]); + writel(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[0]); + } + if (cf->can_dlc > 3) { + u32 data = be32_to_cpup((__be32 *)&cf->data[4]); + writel(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[1]); + } + + writel(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id); + writel(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); + + kfree_skb(skb); + + /* tx_packets is incremented in flexcan_irq */ + stats->tx_bytes += cf->can_dlc; + + return NETDEV_TX_OK; +} + +static void do_bus_err(struct net_device *dev, + struct can_frame *cf, u32 reg_esr) +{ + struct flexcan_priv *priv = netdev_priv(dev); + int rx_errors = 0, tx_errors = 0; + + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; + + if (reg_esr & FLEXCAN_ESR_BIT1_ERR) { + dev_dbg(dev->dev.parent, "BIT1_ERR irq\n"); + cf->data[2] |= CAN_ERR_PROT_BIT1; + tx_errors = 1; + } + if (reg_esr & FLEXCAN_ESR_BIT0_ERR) { + dev_dbg(dev->dev.parent, "BIT0_ERR irq\n"); + cf->data[2] |= CAN_ERR_PROT_BIT0; + tx_errors = 1; + } + if (reg_esr & FLEXCAN_ESR_ACK_ERR) { + dev_dbg(dev->dev.parent, "ACK_ERR irq\n"); + cf->can_id |= CAN_ERR_ACK; + cf->data[3] |= CAN_ERR_PROT_LOC_ACK; + tx_errors = 1; + } + if (reg_esr & FLEXCAN_ESR_CRC_ERR) { + dev_dbg(dev->dev.parent, "CRC_ERR irq\n"); + cf->data[2] |= CAN_ERR_PROT_BIT; + cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; + rx_errors = 1; + } + if (reg_esr & FLEXCAN_ESR_FRM_ERR) { + dev_dbg(dev->dev.parent, "FRM_ERR irq\n"); + cf->data[2] |= CAN_ERR_PROT_FORM; + rx_errors = 1; + } + if (reg_esr & FLEXCAN_ESR_STF_ERR) { + dev_dbg(dev->dev.parent, "STF_ERR irq\n"); + cf->data[2] |= CAN_ERR_PROT_STUFF; + rx_errors = 1; + } + + priv->can.can_stats.bus_error++; + if (rx_errors) + dev->stats.rx_errors++; + if (tx_errors) + dev->stats.tx_errors++; +} + +static int flexcan_poll_bus_err(struct net_device *dev, u32 reg_esr) +{ + struct sk_buff *skb; + struct can_frame *cf; + + skb = alloc_can_err_skb(dev, &cf); + if (unlikely(!skb)) + return 0; + + do_bus_err(dev, cf, reg_esr); + netif_receive_skb(skb); + + dev->stats.rx_packets++; + dev->stats.rx_bytes += cf->can_dlc; + + return 1; +} + +static void do_state(struct net_device *dev, + struct can_frame *cf, enum can_state new_state) +{ + struct flexcan_priv *priv = netdev_priv(dev); + struct can_berr_counter bec; + + flexcan_get_berr_counter(dev, &bec); + + switch (priv->can.state) { + case CAN_STATE_ERROR_ACTIVE: + /* + * from: ERROR_ACTIVE + * to : ERROR_WARNING, ERROR_PASSIVE, BUS_OFF + * => : there was a warning int + */ + if (new_state >= CAN_STATE_ERROR_WARNING && + new_state <= CAN_STATE_BUS_OFF) { + dev_dbg(dev->dev.parent, "Error Warning IRQ\n"); + priv->can.can_stats.error_warning++; + + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = (bec.txerr > bec.rxerr) ? + CAN_ERR_CRTL_TX_WARNING : + CAN_ERR_CRTL_RX_WARNING; + } + case CAN_STATE_ERROR_WARNING: /* fallthrough */ + /* + * from: ERROR_ACTIVE, ERROR_WARNING + * to : ERROR_PASSIVE, BUS_OFF + * => : error passive int + */ + if (new_state >= CAN_STATE_ERROR_PASSIVE && + new_state <= CAN_STATE_BUS_OFF) { + dev_dbg(dev->dev.parent, "Error Passive IRQ\n"); + priv->can.can_stats.error_passive++; + + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = (bec.txerr > bec.rxerr) ? + CAN_ERR_CRTL_TX_PASSIVE : + CAN_ERR_CRTL_RX_PASSIVE; + } + break; + case CAN_STATE_BUS_OFF: + dev_err(dev->dev.parent, + "BUG! hardware recovered automatically from BUS_OFF\n"); + break; + default: + break; + } + + /* process state changes depending on the new state */ + switch (new_state) { + case CAN_STATE_ERROR_ACTIVE: + dev_dbg(dev->dev.parent, "Error Active\n"); + cf->can_id |= CAN_ERR_PROT; + cf->data[2] = CAN_ERR_PROT_ACTIVE; + break; + case CAN_STATE_BUS_OFF: + cf->can_id |= CAN_ERR_BUSOFF; + can_bus_off(dev); + break; + default: + break; + } +} + +static int flexcan_poll_state(struct net_device *dev, u32 reg_esr) +{ + struct flexcan_priv *priv = netdev_priv(dev); + struct sk_buff *skb; + struct can_frame *cf; + enum can_state new_state; + int flt; + + flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK; + if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) { + if (likely(!(reg_esr & (FLEXCAN_ESR_TX_WRN | + FLEXCAN_ESR_RX_WRN)))) + new_state = CAN_STATE_ERROR_ACTIVE; + else + new_state = CAN_STATE_ERROR_WARNING; + } else if (unlikely(flt == FLEXCAN_ESR_FLT_CONF_PASSIVE)) + new_state = CAN_STATE_ERROR_PASSIVE; + else + new_state = CAN_STATE_BUS_OFF; + + /* state hasn't changed */ + if (likely(new_state == priv->can.state)) + return 0; + + skb = alloc_can_err_skb(dev, &cf); + if (unlikely(!skb)) + return 0; + + do_state(dev, cf, new_state); + priv->can.state = new_state; + netif_receive_skb(skb); + + dev->stats.rx_packets++; + dev->stats.rx_bytes += cf->can_dlc; + + return 1; +} + +static void flexcan_read_fifo(const struct net_device *dev, + struct can_frame *cf) +{ + const struct flexcan_priv *priv = netdev_priv(dev); + struct flexcan_regs __iomem *regs = priv->base; + struct flexcan_mb __iomem *mb = ®s->cantxfg[0]; + u32 reg_ctrl, reg_id; + + reg_ctrl = readl(&mb->can_ctrl); + reg_id = readl(&mb->can_id); + if (reg_ctrl & FLEXCAN_MB_CNT_IDE) + cf->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG; + else + cf->can_id = (reg_id >> 18) & CAN_SFF_MASK; + + if (reg_ctrl & FLEXCAN_MB_CNT_RTR) + cf->can_id |= CAN_RTR_FLAG; + cf->can_dlc = get_can_dlc((reg_ctrl >> 16) & 0xf); + + *(__be32 *)(cf->data + 0) = cpu_to_be32(readl(&mb->data[0])); + *(__be32 *)(cf->data + 4) = cpu_to_be32(readl(&mb->data[1])); + + /* mark as read */ + writel(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1); + readl(®s->timer); +} + +static int flexcan_read_frame(struct net_device *dev) +{ + struct net_device_stats *stats = &dev->stats; + struct can_frame *cf; + struct sk_buff *skb; + + skb = alloc_can_skb(dev, &cf); + if (unlikely(!skb)) { + stats->rx_dropped++; + return 0; + } + + flexcan_read_fifo(dev, cf); + netif_receive_skb(skb); + + stats->rx_packets++; + stats->rx_bytes += cf->can_dlc; + + return 1; +} + +static int flexcan_poll(struct napi_struct *napi, int quota) +{ + struct net_device *dev = napi->dev; + const struct flexcan_priv *priv = netdev_priv(dev); + struct flexcan_regs __iomem *regs = priv->base; + u32 reg_iflag1, reg_esr; + int work_done = 0; + + /* + * The error bits are cleared on read, + * use saved value from irq handler. + */ + reg_esr = readl(®s->esr) | priv->reg_esr; + + /* handle state changes */ + work_done += flexcan_poll_state(dev, reg_esr); + + /* handle RX-FIFO */ + reg_iflag1 = readl(®s->iflag1); + while (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE && + work_done < quota) { + work_done += flexcan_read_frame(dev); + reg_iflag1 = readl(®s->iflag1); + } + + /* report bus errors */ + if (flexcan_has_and_handle_berr(priv, reg_esr) && work_done < quota) + work_done += flexcan_poll_bus_err(dev, reg_esr); + + if (work_done < quota) { + napi_complete(napi); + /* enable IRQs */ + writel(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); + writel(priv->reg_ctrl_default, ®s->ctrl); + } + + return work_done; +} + +static irqreturn_t flexcan_irq(int irq, void *dev_id) +{ + struct net_device *dev = dev_id; + struct net_device_stats *stats = &dev->stats; + struct flexcan_priv *priv = netdev_priv(dev); + struct flexcan_regs __iomem *regs = priv->base; + u32 reg_iflag1, reg_esr; + + reg_iflag1 = readl(®s->iflag1); + reg_esr = readl(®s->esr); + writel(FLEXCAN_ESR_ERR_INT, ®s->esr); /* ACK err IRQ */ + + /* + * schedule NAPI in case of: + * - rx IRQ + * - state change IRQ + * - bus error IRQ and bus error reporting is activated + */ + if ((reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) || + (reg_esr & FLEXCAN_ESR_ERR_STATE) || + flexcan_has_and_handle_berr(priv, reg_esr)) { + /* + * The error bits are cleared on read, + * save them for later use. + */ + priv->reg_esr = reg_esr & FLEXCAN_ESR_ERR_BUS; + writel(FLEXCAN_IFLAG_DEFAULT & ~FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, + ®s->imask1); + writel(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, + ®s->ctrl); + napi_schedule(&priv->napi); + } + + /* FIFO overflow */ + if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) { + writel(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1); + dev->stats.rx_over_errors++; + dev->stats.rx_errors++; + } + + /* transmission complete interrupt */ + if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) { + /* tx_bytes is incremented in flexcan_start_xmit */ + stats->tx_packets++; + writel((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1); + netif_wake_queue(dev); + } + + return IRQ_HANDLED; +} + +static void flexcan_set_bittiming(struct net_device *dev) +{ + const struct flexcan_priv *priv = netdev_priv(dev); + const struct can_bittiming *bt = &priv->can.bittiming; + struct flexcan_regs __iomem *regs = priv->base; + u32 reg; + + reg = readl(®s->ctrl); + reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) | + FLEXCAN_CTRL_RJW(0x3) | + FLEXCAN_CTRL_PSEG1(0x7) | + FLEXCAN_CTRL_PSEG2(0x7) | + FLEXCAN_CTRL_PROPSEG(0x7) | + FLEXCAN_CTRL_LPB | + FLEXCAN_CTRL_SMP | + FLEXCAN_CTRL_LOM); + + reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) | + FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) | + FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) | + FLEXCAN_CTRL_RJW(bt->sjw - 1) | + FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1); + + if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) + reg |= FLEXCAN_CTRL_LPB; + if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) + reg |= FLEXCAN_CTRL_LOM; + if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) + reg |= FLEXCAN_CTRL_SMP; + + dev_info(dev->dev.parent, "writing ctrl=0x%08x\n", reg); + writel(reg, ®s->ctrl); + + /* print chip status */ + dev_dbg(dev->dev.parent, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__, + readl(®s->mcr), readl(®s->ctrl)); +} + +/* + * flexcan_chip_start + * + * this functions is entered with clocks enabled + * + */ +static int flexcan_chip_start(struct net_device *dev) +{ + struct flexcan_priv *priv = netdev_priv(dev); + struct flexcan_regs __iomem *regs = priv->base; + unsigned int i; + int err; + u32 reg_mcr, reg_ctrl; + + /* enable module */ + flexcan_chip_enable(priv); + + /* soft reset */ + writel(FLEXCAN_MCR_SOFTRST, ®s->mcr); + udelay(10); + + reg_mcr = readl(®s->mcr); + if (reg_mcr & FLEXCAN_MCR_SOFTRST) { + dev_err(dev->dev.parent, + "Failed to softreset can module (mcr=0x%08x)\n", + reg_mcr); + err = -ENODEV; + goto out; + } + + flexcan_set_bittiming(dev); + + /* + * MCR + * + * enable freeze + * enable fifo + * halt now + * only supervisor access + * enable warning int + * choose format C + * + */ + reg_mcr = readl(®s->mcr); + reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_FEN | FLEXCAN_MCR_HALT | + FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | + FLEXCAN_MCR_IDAM_C; + dev_dbg(dev->dev.parent, "%s: writing mcr=0x%08x", __func__, reg_mcr); + writel(reg_mcr, ®s->mcr); + + /* + * CTRL + * + * disable timer sync feature + * + * disable auto busoff recovery + * transmit lowest buffer first + * + * enable tx and rx warning interrupt + * enable bus off interrupt + * (== FLEXCAN_CTRL_ERR_STATE) + * + * _note_: we enable the "error interrupt" + * (FLEXCAN_CTRL_ERR_MSK), too. Otherwise we don't get any + * warning or bus passive interrupts. + */ + reg_ctrl = readl(®s->ctrl); + reg_ctrl &= ~FLEXCAN_CTRL_TSYN; + reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF | + FLEXCAN_CTRL_ERR_STATE | FLEXCAN_CTRL_ERR_MSK; + + /* save for later use */ + priv->reg_ctrl_default = reg_ctrl; + dev_dbg(dev->dev.parent, "%s: writing ctrl=0x%08x", __func__, reg_ctrl); + writel(reg_ctrl, ®s->ctrl); + + for (i = 0; i < ARRAY_SIZE(regs->cantxfg); i++) { + writel(0, ®s->cantxfg[i].can_ctrl); + writel(0, ®s->cantxfg[i].can_id); + writel(0, ®s->cantxfg[i].data[0]); + writel(0, ®s->cantxfg[i].data[1]); + + /* put MB into rx queue */ + writel(FLEXCAN_MB_CNT_CODE(0x4), ®s->cantxfg[i].can_ctrl); + } + + /* acceptance mask/acceptance code (accept everything) */ + writel(0x0, ®s->rxgmask); + writel(0x0, ®s->rx14mask); + writel(0x0, ®s->rx15mask); + + flexcan_transceiver_switch(priv, 1); + + /* synchronize with the can bus */ + reg_mcr = readl(®s->mcr); + reg_mcr &= ~FLEXCAN_MCR_HALT; + writel(reg_mcr, ®s->mcr); + + priv->can.state = CAN_STATE_ERROR_ACTIVE; + + /* enable FIFO interrupts */ + writel(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); + + /* print chip status */ + dev_dbg(dev->dev.parent, "%s: reading mcr=0x%08x ctrl=0x%08x\n", + __func__, readl(®s->mcr), readl(®s->ctrl)); + + return 0; + + out: + flexcan_chip_disable(priv); + return err; +} + +/* + * flexcan_chip_stop + * + * this functions is entered with clocks enabled + * + */ +static void flexcan_chip_stop(struct net_device *dev) +{ + struct flexcan_priv *priv = netdev_priv(dev); + struct flexcan_regs __iomem *regs = priv->base; + u32 reg; + + /* Disable all interrupts */ + writel(0, ®s->imask1); + + /* Disable + halt module */ + reg = readl(®s->mcr); + reg |= FLEXCAN_MCR_MDIS | FLEXCAN_MCR_HALT; + writel(reg, ®s->mcr); + + flexcan_transceiver_switch(priv, 0); + priv->can.state = CAN_STATE_STOPPED; + + return; +} + +static int flexcan_open(struct net_device *dev) +{ + struct flexcan_priv *priv = netdev_priv(dev); + int err; + + clk_enable(priv->clk); + + err = open_candev(dev); + if (err) + goto out; + + err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev); + if (err) + goto out_close; + + /* start chip and queuing */ + err = flexcan_chip_start(dev); + if (err) + goto out_close; + napi_enable(&priv->napi); + netif_start_queue(dev); + + return 0; + + out_close: + close_candev(dev); + out: + clk_disable(priv->clk); + + return err; +} + +static int flexcan_close(struct net_device *dev) +{ + struct flexcan_priv *priv = netdev_priv(dev); + + netif_stop_queue(dev); + napi_disable(&priv->napi); + flexcan_chip_stop(dev); + + free_irq(dev->irq, dev); + clk_disable(priv->clk); + + close_candev(dev); + + return 0; +} + +static int flexcan_set_mode(struct net_device *dev, enum can_mode mode) +{ + int err; + + switch (mode) { + case CAN_MODE_START: + err = flexcan_chip_start(dev); + if (err) + return err; + + netif_wake_queue(dev); + break; + + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static const struct net_device_ops flexcan_netdev_ops = { + .ndo_open = flexcan_open, + .ndo_stop = flexcan_close, + .ndo_start_xmit = flexcan_start_xmit, +}; + +static int __devinit register_flexcandev(struct net_device *dev) +{ + struct flexcan_priv *priv = netdev_priv(dev); + struct flexcan_regs __iomem *regs = priv->base; + u32 reg, err; + + clk_enable(priv->clk); + + /* select "bus clock", chip must be disabled */ + flexcan_chip_disable(priv); + reg = readl(®s->ctrl); + reg |= FLEXCAN_CTRL_CLK_SRC; + writel(reg, ®s->ctrl); + + flexcan_chip_enable(priv); + + /* set freeze, halt and activate FIFO, restrict register access */ + reg = readl(®s->mcr); + reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | + FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV; + writel(reg, ®s->mcr); + + /* + * Currently we only support newer versions of this core + * featuring a RX FIFO. Older cores found on some Coldfire + * derivates are not yet supported. + */ + reg = readl(®s->mcr); + if (!(reg & FLEXCAN_MCR_FEN)) { + dev_err(dev->dev.parent, + "Could not enable RX FIFO, unsupported core\n"); + err = -ENODEV; + goto out; + } + + err = register_candev(dev); + + out: + /* disable core and turn off clocks */ + flexcan_chip_disable(priv); + clk_disable(priv->clk); + + return err; +} + +static void __devexit unregister_flexcandev(struct net_device *dev) +{ + unregister_candev(dev); +} + +static int __devinit flexcan_probe(struct platform_device *pdev) +{ + struct net_device *dev; + struct flexcan_priv *priv; + struct resource *mem; + struct clk *clk; + void __iomem *base; + resource_size_t mem_size; + int err, irq; + + clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "no clock defined\n"); + err = PTR_ERR(clk); + goto failed_clock; + } + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + irq = platform_get_irq(pdev, 0); + if (!mem || irq <= 0) { + err = -ENODEV; + goto failed_get; + } + + mem_size = resource_size(mem); + if (!request_mem_region(mem->start, mem_size, pdev->name)) { + err = -EBUSY; + goto failed_req; + } + + base = ioremap(mem->start, mem_size); + if (!base) { + err = -ENOMEM; + goto failed_map; + } + + dev = alloc_candev(sizeof(struct flexcan_priv), 0); + if (!dev) { + err = -ENOMEM; + goto failed_alloc; + } + + dev->netdev_ops = &flexcan_netdev_ops; + dev->irq = irq; + dev->flags |= IFF_ECHO; /* we support local echo in hardware */ + + priv = netdev_priv(dev); + priv->can.clock.freq = clk_get_rate(clk); + priv->can.bittiming_const = &flexcan_bittiming_const; + priv->can.do_set_mode = flexcan_set_mode; + priv->can.do_get_berr_counter = flexcan_get_berr_counter; + priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | + CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES | + CAN_CTRLMODE_BERR_REPORTING; + priv->base = base; + priv->dev = dev; + priv->clk = clk; + priv->pdata = pdev->dev.platform_data; + + netif_napi_add(dev, &priv->napi, flexcan_poll, FLEXCAN_NAPI_WEIGHT); + + dev_set_drvdata(&pdev->dev, dev); + SET_NETDEV_DEV(dev, &pdev->dev); + + err = register_flexcandev(dev); + if (err) { + dev_err(&pdev->dev, "registering netdev failed\n"); + goto failed_register; + } + + dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%d)\n", + priv->base, dev->irq); + + return 0; + + failed_register: + free_candev(dev); + failed_alloc: + iounmap(base); + failed_map: + release_mem_region(mem->start, mem_size); + failed_req: + clk_put(clk); + failed_get: + failed_clock: + return err; +} + +static int __devexit flexcan_remove(struct platform_device *pdev) +{ + struct net_device *dev = platform_get_drvdata(pdev); + struct flexcan_priv *priv = netdev_priv(dev); + struct resource *mem; + + unregister_flexcandev(dev); + platform_set_drvdata(pdev, NULL); + free_candev(dev); + iounmap(priv->base); + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + release_mem_region(mem->start, resource_size(mem)); + + clk_put(priv->clk); + + return 0; +} + +static struct platform_driver flexcan_driver = { + .driver.name = DRV_NAME, + .probe = flexcan_probe, + .remove = __devexit_p(flexcan_remove), +}; + +static int __init flexcan_init(void) +{ + pr_info("%s netdevice driver\n", DRV_NAME); + return platform_driver_register(&flexcan_driver); +} + +static void __exit flexcan_exit(void) +{ + platform_driver_unregister(&flexcan_driver); + pr_info("%s: driver removed\n", DRV_NAME); +} + +module_init(flexcan_init); +module_exit(flexcan_exit); + +MODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, " + "Marc Kleine-Budde <kernel@pengutronix.de>"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("CAN port driver for flexcan based chip"); diff --git a/drivers/net/can/mscan/mscan.h b/drivers/net/can/mscan/mscan.h index 4ff966473bc..b43e9f5d326 100644 --- a/drivers/net/can/mscan/mscan.h +++ b/drivers/net/can/mscan/mscan.h @@ -227,7 +227,7 @@ struct mscan_regs { u16 time; /* + 0x7c 0x3e */ } tx; _MSCAN_RESERVED_(32, 2); /* + 0x7e */ -} __attribute__ ((packed)); +} __packed; #undef _MSCAN_RESERVED_ #define MSCAN_REGION sizeof(struct mscan) diff --git a/drivers/net/can/usb/Kconfig b/drivers/net/can/usb/Kconfig index 97ff6febad6..04525495b15 100644 --- a/drivers/net/can/usb/Kconfig +++ b/drivers/net/can/usb/Kconfig @@ -7,4 +7,10 @@ config CAN_EMS_USB This driver is for the one channel CPC-USB/ARM7 CAN/USB interface from EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de). +config CAN_ESD_USB2 + tristate "ESD USB/2 CAN/USB interface" + ---help--- + This driver supports the CAN-USB/2 interface + from esd electronic system design gmbh (http://www.esd.eu). + endmenu diff --git a/drivers/net/can/usb/Makefile b/drivers/net/can/usb/Makefile index 0afd51d4c7a..fce3cf11719 100644 --- a/drivers/net/can/usb/Makefile +++ b/drivers/net/can/usb/Makefile @@ -3,5 +3,6 @@ # obj-$(CONFIG_CAN_EMS_USB) += ems_usb.o +obj-$(CONFIG_CAN_ESD_USB2) += esd_usb2.o ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c index 1fc0871d2ef..e75f1a87697 100644 --- a/drivers/net/can/usb/ems_usb.c +++ b/drivers/net/can/usb/ems_usb.c @@ -197,7 +197,7 @@ struct cpc_can_err_counter { }; /* Main message type used between library and application */ -struct __attribute__ ((packed)) ems_cpc_msg { +struct __packed ems_cpc_msg { u8 type; /* type of message */ u8 length; /* length of data within union 'msg' */ u8 msgid; /* confirmation handle */ diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c new file mode 100644 index 00000000000..05a52754f48 --- /dev/null +++ b/drivers/net/can/usb/esd_usb2.c @@ -0,0 +1,1132 @@ +/* + * CAN driver for esd CAN-USB/2 + * + * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh + * + * 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; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ +#include <linux/init.h> +#include <linux/signal.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/usb.h> + +#include <linux/can.h> +#include <linux/can/dev.h> +#include <linux/can/error.h> + +MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>"); +MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 interfaces"); +MODULE_LICENSE("GPL v2"); + +/* Define these values to match your devices */ +#define USB_ESDGMBH_VENDOR_ID 0x0ab4 +#define USB_CANUSB2_PRODUCT_ID 0x0010 + +#define ESD_USB2_CAN_CLOCK 60000000 +#define ESD_USB2_MAX_NETS 2 + +/* USB2 commands */ +#define CMD_VERSION 1 /* also used for VERSION_REPLY */ +#define CMD_CAN_RX 2 /* device to host only */ +#define CMD_CAN_TX 3 /* also used for TX_DONE */ +#define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */ +#define CMD_TS 5 /* also used for TS_REPLY */ +#define CMD_IDADD 6 /* also used for IDADD_REPLY */ + +/* esd CAN message flags - dlc field */ +#define ESD_RTR 0x10 + +/* esd CAN message flags - id field */ +#define ESD_EXTID 0x20000000 +#define ESD_EVENT 0x40000000 +#define ESD_IDMASK 0x1fffffff + +/* esd CAN event ids used by this driver */ +#define ESD_EV_CAN_ERROR_EXT 2 + +/* baudrate message flags */ +#define ESD_USB2_UBR 0x80000000 +#define ESD_USB2_LOM 0x40000000 +#define ESD_USB2_NO_BAUDRATE 0x7fffffff +#define ESD_USB2_TSEG1_MIN 1 +#define ESD_USB2_TSEG1_MAX 16 +#define ESD_USB2_TSEG1_SHIFT 16 +#define ESD_USB2_TSEG2_MIN 1 +#define ESD_USB2_TSEG2_MAX 8 +#define ESD_USB2_TSEG2_SHIFT 20 +#define ESD_USB2_SJW_MAX 4 +#define ESD_USB2_SJW_SHIFT 14 +#define ESD_USB2_BRP_MIN 1 +#define ESD_USB2_BRP_MAX 1024 +#define ESD_USB2_BRP_INC 1 +#define ESD_USB2_3_SAMPLES 0x00800000 + +/* esd IDADD message */ +#define ESD_ID_ENABLE 0x80 +#define ESD_MAX_ID_SEGMENT 64 + +/* SJA1000 ECC register (emulated by usb2 firmware) */ +#define SJA1000_ECC_SEG 0x1F +#define SJA1000_ECC_DIR 0x20 +#define SJA1000_ECC_ERR 0x06 +#define SJA1000_ECC_BIT 0x00 +#define SJA1000_ECC_FORM 0x40 +#define SJA1000_ECC_STUFF 0x80 +#define SJA1000_ECC_MASK 0xc0 + +/* esd bus state event codes */ +#define ESD_BUSSTATE_MASK 0xc0 +#define ESD_BUSSTATE_WARN 0x40 +#define ESD_BUSSTATE_ERRPASSIVE 0x80 +#define ESD_BUSSTATE_BUSOFF 0xc0 + +#define RX_BUFFER_SIZE 1024 +#define MAX_RX_URBS 4 +#define MAX_TX_URBS 16 /* must be power of 2 */ + +struct header_msg { + u8 len; /* len is always the total message length in 32bit words */ + u8 cmd; + u8 rsvd[2]; +}; + +struct version_msg { + u8 len; + u8 cmd; + u8 rsvd; + u8 flags; + __le32 drv_version; +}; + +struct version_reply_msg { + u8 len; + u8 cmd; + u8 nets; + u8 features; + __le32 version; + u8 name[16]; + __le32 rsvd; + __le32 ts; +}; + +struct rx_msg { + u8 len; + u8 cmd; + u8 net; + u8 dlc; + __le32 ts; + __le32 id; /* upper 3 bits contain flags */ + u8 data[8]; +}; + +struct tx_msg { + u8 len; + u8 cmd; + u8 net; + u8 dlc; + __le32 hnd; + __le32 id; /* upper 3 bits contain flags */ + u8 data[8]; +}; + +struct tx_done_msg { + u8 len; + u8 cmd; + u8 net; + u8 status; + __le32 hnd; + __le32 ts; +}; + +struct id_filter_msg { + u8 len; + u8 cmd; + u8 net; + u8 option; + __le32 mask[ESD_MAX_ID_SEGMENT + 1]; +}; + +struct set_baudrate_msg { + u8 len; + u8 cmd; + u8 net; + u8 rsvd; + __le32 baud; +}; + +/* Main message type used between library and application */ +struct __attribute__ ((packed)) esd_usb2_msg { + union { + struct header_msg hdr; + struct version_msg version; + struct version_reply_msg version_reply; + struct rx_msg rx; + struct tx_msg tx; + struct tx_done_msg txdone; + struct set_baudrate_msg setbaud; + struct id_filter_msg filter; + } msg; +}; + +static struct usb_device_id esd_usb2_table[] = { + {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)}, + {} +}; +MODULE_DEVICE_TABLE(usb, esd_usb2_table); + +struct esd_usb2_net_priv; + +struct esd_tx_urb_context { + struct esd_usb2_net_priv *priv; + u32 echo_index; + int dlc; +}; + +struct esd_usb2 { + struct usb_device *udev; + struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS]; + + struct usb_anchor rx_submitted; + + int net_count; + u32 version; + int rxinitdone; +}; + +struct esd_usb2_net_priv { + struct can_priv can; /* must be the first member */ + + atomic_t active_tx_jobs; + struct usb_anchor tx_submitted; + struct esd_tx_urb_context tx_contexts[MAX_TX_URBS]; + + int open_time; + struct esd_usb2 *usb2; + struct net_device *netdev; + int index; + u8 old_state; + struct can_berr_counter bec; +}; + +static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv, + struct esd_usb2_msg *msg) +{ + struct net_device_stats *stats = &priv->netdev->stats; + struct can_frame *cf; + struct sk_buff *skb; + u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK; + + if (id == ESD_EV_CAN_ERROR_EXT) { + u8 state = msg->msg.rx.data[0]; + u8 ecc = msg->msg.rx.data[1]; + u8 txerr = msg->msg.rx.data[2]; + u8 rxerr = msg->msg.rx.data[3]; + + skb = alloc_can_err_skb(priv->netdev, &cf); + if (skb == NULL) { + stats->rx_dropped++; + return; + } + + if (state != priv->old_state) { + priv->old_state = state; + + switch (state & ESD_BUSSTATE_MASK) { + case ESD_BUSSTATE_BUSOFF: + priv->can.state = CAN_STATE_BUS_OFF; + cf->can_id |= CAN_ERR_BUSOFF; + can_bus_off(priv->netdev); + break; + case ESD_BUSSTATE_WARN: + priv->can.state = CAN_STATE_ERROR_WARNING; + priv->can.can_stats.error_warning++; + break; + case ESD_BUSSTATE_ERRPASSIVE: + priv->can.state = CAN_STATE_ERROR_PASSIVE; + priv->can.can_stats.error_passive++; + break; + default: + priv->can.state = CAN_STATE_ERROR_ACTIVE; + break; + } + } else { + priv->can.can_stats.bus_error++; + stats->rx_errors++; + + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; + + switch (ecc & SJA1000_ECC_MASK) { + case SJA1000_ECC_BIT: + cf->data[2] |= CAN_ERR_PROT_BIT; + break; + case SJA1000_ECC_FORM: + cf->data[2] |= CAN_ERR_PROT_FORM; + break; + case SJA1000_ECC_STUFF: + cf->data[2] |= CAN_ERR_PROT_STUFF; + break; + default: + cf->data[2] |= CAN_ERR_PROT_UNSPEC; + cf->data[3] = ecc & SJA1000_ECC_SEG; + break; + } + + /* Error occured during transmission? */ + if (!(ecc & SJA1000_ECC_DIR)) + cf->data[2] |= CAN_ERR_PROT_TX; + + if (priv->can.state == CAN_STATE_ERROR_WARNING || + priv->can.state == CAN_STATE_ERROR_PASSIVE) { + cf->data[1] = (txerr > rxerr) ? + CAN_ERR_CRTL_TX_PASSIVE : + CAN_ERR_CRTL_RX_PASSIVE; + } + cf->data[6] = txerr; + cf->data[7] = rxerr; + } + + netif_rx(skb); + + priv->bec.txerr = txerr; + priv->bec.rxerr = rxerr; + + stats->rx_packets++; + stats->rx_bytes += cf->can_dlc; + } +} + +static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv, + struct esd_usb2_msg *msg) +{ + struct net_device_stats *stats = &priv->netdev->stats; + struct can_frame *cf; + struct sk_buff *skb; + int i; + u32 id; + + if (!netif_device_present(priv->netdev)) + return; + + id = le32_to_cpu(msg->msg.rx.id); + + if (id & ESD_EVENT) { + esd_usb2_rx_event(priv, msg); + } else { + skb = alloc_can_skb(priv->netdev, &cf); + if (skb == NULL) { + stats->rx_dropped++; + return; + } + + cf->can_id = id & ESD_IDMASK; + cf->can_dlc = get_can_dlc(msg->msg.rx.dlc); + + if (id & ESD_EXTID) + cf->can_id |= CAN_EFF_FLAG; + + if (msg->msg.rx.dlc & ESD_RTR) { + cf->can_id |= CAN_RTR_FLAG; + } else { + for (i = 0; i < cf->can_dlc; i++) + cf->data[i] = msg->msg.rx.data[i]; + } + + netif_rx(skb); + + stats->rx_packets++; + stats->rx_bytes += cf->can_dlc; + } + + return; +} + +static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv, + struct esd_usb2_msg *msg) +{ + struct net_device_stats *stats = &priv->netdev->stats; + struct net_device *netdev = priv->netdev; + struct esd_tx_urb_context *context; + + if (!netif_device_present(netdev)) + return; + + context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; + + if (!msg->msg.txdone.status) { + stats->tx_packets++; + stats->tx_bytes += context->dlc; + can_get_echo_skb(netdev, context->echo_index); + } else { + stats->tx_errors++; + can_free_echo_skb(netdev, context->echo_index); + } + + /* Release context */ + context->echo_index = MAX_TX_URBS; + atomic_dec(&priv->active_tx_jobs); + + netif_wake_queue(netdev); +} + +static void esd_usb2_read_bulk_callback(struct urb *urb) +{ + struct esd_usb2 *dev = urb->context; + int retval; + int pos = 0; + int i; + + switch (urb->status) { + case 0: /* success */ + break; + + case -ENOENT: + case -ESHUTDOWN: + return; + + default: + dev_info(dev->udev->dev.parent, + "Rx URB aborted (%d)\n", urb->status); + goto resubmit_urb; + } + + while (pos < urb->actual_length) { + struct esd_usb2_msg *msg; + + msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos); + + switch (msg->msg.hdr.cmd) { + case CMD_CAN_RX: + esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg); + break; + + case CMD_CAN_TX: + esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net], + msg); + break; + } + + pos += msg->msg.hdr.len << 2; + + if (pos > urb->actual_length) { + dev_err(dev->udev->dev.parent, "format error\n"); + break; + } + } + +resubmit_urb: + usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), + urb->transfer_buffer, RX_BUFFER_SIZE, + esd_usb2_read_bulk_callback, dev); + + retval = usb_submit_urb(urb, GFP_ATOMIC); + if (retval == -ENODEV) { + for (i = 0; i < dev->net_count; i++) { + if (dev->nets[i]) + netif_device_detach(dev->nets[i]->netdev); + } + } else if (retval) { + dev_err(dev->udev->dev.parent, + "failed resubmitting read bulk urb: %d\n", retval); + } + + return; +} + +/* + * callback for bulk IN urb + */ +static void esd_usb2_write_bulk_callback(struct urb *urb) +{ + struct esd_tx_urb_context *context = urb->context; + struct esd_usb2_net_priv *priv; + struct esd_usb2 *dev; + struct net_device *netdev; + size_t size = sizeof(struct esd_usb2_msg); + + WARN_ON(!context); + + priv = context->priv; + netdev = priv->netdev; + dev = priv->usb2; + + /* free up our allocated buffer */ + usb_free_coherent(urb->dev, size, + urb->transfer_buffer, urb->transfer_dma); + + if (!netif_device_present(netdev)) + return; + + if (urb->status) + dev_info(netdev->dev.parent, "Tx URB aborted (%d)\n", + urb->status); + + netdev->trans_start = jiffies; +} + +static ssize_t show_firmware(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct usb_interface *intf = to_usb_interface(d); + struct esd_usb2 *dev = usb_get_intfdata(intf); + + return sprintf(buf, "%d.%d.%d\n", + (dev->version >> 12) & 0xf, + (dev->version >> 8) & 0xf, + dev->version & 0xff); +} +static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL); + +static ssize_t show_hardware(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct usb_interface *intf = to_usb_interface(d); + struct esd_usb2 *dev = usb_get_intfdata(intf); + + return sprintf(buf, "%d.%d.%d\n", + (dev->version >> 28) & 0xf, + (dev->version >> 24) & 0xf, + (dev->version >> 16) & 0xff); +} +static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL); + +static ssize_t show_nets(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct usb_interface *intf = to_usb_interface(d); + struct esd_usb2 *dev = usb_get_intfdata(intf); + + return sprintf(buf, "%d", dev->net_count); +} +static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL); + +static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) +{ + int actual_length; + + return usb_bulk_msg(dev->udev, + usb_sndbulkpipe(dev->udev, 2), + msg, + msg->msg.hdr.len << 2, + &actual_length, + 1000); +} + +static int esd_usb2_wait_msg(struct esd_usb2 *dev, + struct esd_usb2_msg *msg) +{ + int actual_length; + + return usb_bulk_msg(dev->udev, + usb_rcvbulkpipe(dev->udev, 1), + msg, + sizeof(*msg), + &actual_length, + 1000); +} + +static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) +{ + int i, err = 0; + + if (dev->rxinitdone) + return 0; + + for (i = 0; i < MAX_RX_URBS; i++) { + struct urb *urb = NULL; + u8 *buf = NULL; + + /* create a URB, and a buffer for it */ + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) { + dev_warn(dev->udev->dev.parent, + "No memory left for URBs\n"); + err = -ENOMEM; + break; + } + + buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, + &urb->transfer_dma); + if (!buf) { + dev_warn(dev->udev->dev.parent, + "No memory left for USB buffer\n"); + err = -ENOMEM; + goto freeurb; + } + + usb_fill_bulk_urb(urb, dev->udev, + usb_rcvbulkpipe(dev->udev, 1), + buf, RX_BUFFER_SIZE, + esd_usb2_read_bulk_callback, dev); + urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + usb_anchor_urb(urb, &dev->rx_submitted); + + err = usb_submit_urb(urb, GFP_KERNEL); + if (err) { + usb_unanchor_urb(urb); + usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, + urb->transfer_dma); + } + +freeurb: + /* Drop reference, USB core will take care of freeing it */ + usb_free_urb(urb); + if (err) + break; + } + + /* Did we submit any URBs */ + if (i == 0) { + dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); + return err; + } + + /* Warn if we've couldn't transmit all the URBs */ + if (i < MAX_RX_URBS) { + dev_warn(dev->udev->dev.parent, + "rx performance may be slow\n"); + } + + dev->rxinitdone = 1; + return 0; +} + +/* + * Start interface + */ +static int esd_usb2_start(struct esd_usb2_net_priv *priv) +{ + struct esd_usb2 *dev = priv->usb2; + struct net_device *netdev = priv->netdev; + struct esd_usb2_msg msg; + int err, i; + + /* + * Enable all IDs + * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). + * Each bit represents one 11 bit CAN identifier. A set bit + * enables reception of the corresponding CAN identifier. A cleared + * bit disabled this identifier. An additional bitmask value + * following the CAN 2.0A bits is used to enable reception of + * extended CAN frames. Only the LSB of this final mask is checked + * for the complete 29 bit ID range. The IDADD message also allows + * filter configuration for an ID subset. In this case you can add + * the number of the starting bitmask (0..64) to the filter.option + * field followed by only some bitmasks. + */ + msg.msg.hdr.cmd = CMD_IDADD; + msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; + msg.msg.filter.net = priv->index; + msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ + for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) + msg.msg.filter.mask[i] = cpu_to_le32(0xffffffff); + /* enable 29bit extended IDs */ + msg.msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); + + err = esd_usb2_send_msg(dev, &msg); + if (err) + goto failed; + + err = esd_usb2_setup_rx_urbs(dev); + if (err) + goto failed; + + priv->can.state = CAN_STATE_ERROR_ACTIVE; + + return 0; + +failed: + if (err == -ENODEV) + netif_device_detach(netdev); + + dev_err(netdev->dev.parent, "couldn't start device: %d\n", err); + + return err; +} + +static void unlink_all_urbs(struct esd_usb2 *dev) +{ + struct esd_usb2_net_priv *priv; + int i; + + usb_kill_anchored_urbs(&dev->rx_submitted); + for (i = 0; i < dev->net_count; i++) { + priv = dev->nets[i]; + if (priv) { + usb_kill_anchored_urbs(&priv->tx_submitted); + atomic_set(&priv->active_tx_jobs, 0); + + for (i = 0; i < MAX_TX_URBS; i++) + priv->tx_contexts[i].echo_index = MAX_TX_URBS; + } + } +} + +static int esd_usb2_open(struct net_device *netdev) +{ + struct esd_usb2_net_priv *priv = netdev_priv(netdev); + int err; + + /* common open */ + err = open_candev(netdev); + if (err) + return err; + + /* finally start device */ + err = esd_usb2_start(priv); + if (err) { + dev_warn(netdev->dev.parent, + "couldn't start device: %d\n", err); + close_candev(netdev); + return err; + } + + priv->open_time = jiffies; + + netif_start_queue(netdev); + + return 0; +} + +static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, + struct net_device *netdev) +{ + struct esd_usb2_net_priv *priv = netdev_priv(netdev); + struct esd_usb2 *dev = priv->usb2; + struct esd_tx_urb_context *context = NULL; + struct net_device_stats *stats = &netdev->stats; + struct can_frame *cf = (struct can_frame *)skb->data; + struct esd_usb2_msg *msg; + struct urb *urb; + u8 *buf; + int i, err; + int ret = NETDEV_TX_OK; + size_t size = sizeof(struct esd_usb2_msg); + + if (can_dropped_invalid_skb(netdev, skb)) + return NETDEV_TX_OK; + + /* create a URB, and a buffer for it, and copy the data to the URB */ + urb = usb_alloc_urb(0, GFP_ATOMIC); + if (!urb) { + dev_err(netdev->dev.parent, "No memory left for URBs\n"); + stats->tx_dropped++; + dev_kfree_skb(skb); + goto nourbmem; + } + + buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, + &urb->transfer_dma); + if (!buf) { + dev_err(netdev->dev.parent, "No memory left for USB buffer\n"); + stats->tx_dropped++; + dev_kfree_skb(skb); + goto nobufmem; + } + + msg = (struct esd_usb2_msg *)buf; + + msg->msg.hdr.len = 3; /* minimal length */ + msg->msg.hdr.cmd = CMD_CAN_TX; + msg->msg.tx.net = priv->index; + msg->msg.tx.dlc = cf->can_dlc; + msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); + + if (cf->can_id & CAN_RTR_FLAG) + msg->msg.tx.dlc |= ESD_RTR; + + if (cf->can_id & CAN_EFF_FLAG) + msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); + + for (i = 0; i < cf->can_dlc; i++) + msg->msg.tx.data[i] = cf->data[i]; + + msg->msg.hdr.len += (cf->can_dlc + 3) >> 2; + + for (i = 0; i < MAX_TX_URBS; i++) { + if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { + context = &priv->tx_contexts[i]; + break; + } + } + + /* + * This may never happen. + */ + if (!context) { + dev_warn(netdev->dev.parent, "couldn't find free context\n"); + ret = NETDEV_TX_BUSY; + goto releasebuf; + } + + context->priv = priv; + context->echo_index = i; + context->dlc = cf->can_dlc; + + /* hnd must not be 0 - MSB is stripped in txdone handling */ + msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ + + usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, + msg->msg.hdr.len << 2, + esd_usb2_write_bulk_callback, context); + + urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + + usb_anchor_urb(urb, &priv->tx_submitted); + + can_put_echo_skb(skb, netdev, context->echo_index); + + atomic_inc(&priv->active_tx_jobs); + + /* Slow down tx path */ + if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) + netif_stop_queue(netdev); + + err = usb_submit_urb(urb, GFP_ATOMIC); + if (err) { + can_free_echo_skb(netdev, context->echo_index); + + atomic_dec(&priv->active_tx_jobs); + usb_unanchor_urb(urb); + + stats->tx_dropped++; + + if (err == -ENODEV) + netif_device_detach(netdev); + else + dev_warn(netdev->dev.parent, "failed tx_urb %d\n", err); + + goto releasebuf; + } + + netdev->trans_start = jiffies; + + /* + * Release our reference to this URB, the USB core will eventually free + * it entirely. + */ + usb_free_urb(urb); + + return NETDEV_TX_OK; + +releasebuf: + usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); + +nobufmem: + usb_free_urb(urb); + +nourbmem: + return ret; +} + +static int esd_usb2_close(struct net_device *netdev) +{ + struct esd_usb2_net_priv *priv = netdev_priv(netdev); + struct esd_usb2_msg msg; + int i; + + /* Disable all IDs (see esd_usb2_start()) */ + msg.msg.hdr.cmd = CMD_IDADD; + msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; + msg.msg.filter.net = priv->index; + msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ + for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) + msg.msg.filter.mask[i] = 0; + if (esd_usb2_send_msg(priv->usb2, &msg) < 0) + dev_err(netdev->dev.parent, "sending idadd message failed\n"); + + /* set CAN controller to reset mode */ + msg.msg.hdr.len = 2; + msg.msg.hdr.cmd = CMD_SETBAUD; + msg.msg.setbaud.net = priv->index; + msg.msg.setbaud.rsvd = 0; + msg.msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); + if (esd_usb2_send_msg(priv->usb2, &msg) < 0) + dev_err(netdev->dev.parent, "sending setbaud message failed\n"); + + priv->can.state = CAN_STATE_STOPPED; + + netif_stop_queue(netdev); + + close_candev(netdev); + + priv->open_time = 0; + + return 0; +} + +static const struct net_device_ops esd_usb2_netdev_ops = { + .ndo_open = esd_usb2_open, + .ndo_stop = esd_usb2_close, + .ndo_start_xmit = esd_usb2_start_xmit, +}; + +static struct can_bittiming_const esd_usb2_bittiming_const = { + .name = "esd_usb2", + .tseg1_min = ESD_USB2_TSEG1_MIN, + .tseg1_max = ESD_USB2_TSEG1_MAX, + .tseg2_min = ESD_USB2_TSEG2_MIN, + .tseg2_max = ESD_USB2_TSEG2_MAX, + .sjw_max = ESD_USB2_SJW_MAX, + .brp_min = ESD_USB2_BRP_MIN, + .brp_max = ESD_USB2_BRP_MAX, + .brp_inc = ESD_USB2_BRP_INC, +}; + +static int esd_usb2_set_bittiming(struct net_device *netdev) +{ + struct esd_usb2_net_priv *priv = netdev_priv(netdev); + struct can_bittiming *bt = &priv->can.bittiming; + struct esd_usb2_msg msg; + u32 canbtr; + + canbtr = ESD_USB2_UBR; + canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); + canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) + << ESD_USB2_SJW_SHIFT; + canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) + & (ESD_USB2_TSEG1_MAX - 1)) + << ESD_USB2_TSEG1_SHIFT; + canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) + << ESD_USB2_TSEG2_SHIFT; + if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) + canbtr |= ESD_USB2_3_SAMPLES; + + msg.msg.hdr.len = 2; + msg.msg.hdr.cmd = CMD_SETBAUD; + msg.msg.setbaud.net = priv->index; + msg.msg.setbaud.rsvd = 0; + msg.msg.setbaud.baud = cpu_to_le32(canbtr); + + dev_info(netdev->dev.parent, "setting BTR=%#x\n", canbtr); + + return esd_usb2_send_msg(priv->usb2, &msg); +} + +static int esd_usb2_get_berr_counter(const struct net_device *netdev, + struct can_berr_counter *bec) +{ + struct esd_usb2_net_priv *priv = netdev_priv(netdev); + + bec->txerr = priv->bec.txerr; + bec->rxerr = priv->bec.rxerr; + + return 0; +} + +static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode) +{ + struct esd_usb2_net_priv *priv = netdev_priv(netdev); + + if (!priv->open_time) + return -EINVAL; + + switch (mode) { + case CAN_MODE_START: + netif_wake_queue(netdev); + break; + + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int esd_usb2_probe_one_net(struct usb_interface *intf, int index) +{ + struct esd_usb2 *dev = usb_get_intfdata(intf); + struct net_device *netdev; + struct esd_usb2_net_priv *priv; + int err = 0; + int i; + + netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); + if (!netdev) { + dev_err(&intf->dev, "couldn't alloc candev\n"); + err = -ENOMEM; + goto done; + } + + priv = netdev_priv(netdev); + + init_usb_anchor(&priv->tx_submitted); + atomic_set(&priv->active_tx_jobs, 0); + + for (i = 0; i < MAX_TX_URBS; i++) + priv->tx_contexts[i].echo_index = MAX_TX_URBS; + + priv->usb2 = dev; + priv->netdev = netdev; + priv->index = index; + + priv->can.state = CAN_STATE_STOPPED; + priv->can.clock.freq = ESD_USB2_CAN_CLOCK; + priv->can.bittiming_const = &esd_usb2_bittiming_const; + priv->can.do_set_bittiming = esd_usb2_set_bittiming; + priv->can.do_set_mode = esd_usb2_set_mode; + priv->can.do_get_berr_counter = esd_usb2_get_berr_counter; + priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; + + netdev->flags |= IFF_ECHO; /* we support local echo */ + + netdev->netdev_ops = &esd_usb2_netdev_ops; + + SET_NETDEV_DEV(netdev, &intf->dev); + + err = register_candev(netdev); + if (err) { + dev_err(&intf->dev, + "couldn't register CAN device: %d\n", err); + free_candev(netdev); + err = -ENOMEM; + goto done; + } + + dev->nets[index] = priv; + dev_info(netdev->dev.parent, "device %s registered\n", netdev->name); + +done: + return err; +} + +/* + * probe function for new USB2 devices + * + * check version information and number of available + * CAN interfaces + */ +static int esd_usb2_probe(struct usb_interface *intf, + const struct usb_device_id *id) +{ + struct esd_usb2 *dev; + struct esd_usb2_msg msg; + int i, err; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) { + err = -ENOMEM; + goto done; + } + + dev->udev = interface_to_usbdev(intf); + + init_usb_anchor(&dev->rx_submitted); + + usb_set_intfdata(intf, dev); + + /* query number of CAN interfaces (nets) */ + msg.msg.hdr.cmd = CMD_VERSION; + msg.msg.hdr.len = 2; + msg.msg.version.rsvd = 0; + msg.msg.version.flags = 0; + msg.msg.version.drv_version = 0; + + err = esd_usb2_send_msg(dev, &msg); + if (err < 0) { + dev_err(&intf->dev, "sending version message failed\n"); + goto free_dev; + } + + err = esd_usb2_wait_msg(dev, &msg); + if (err < 0) { + dev_err(&intf->dev, "no version message answer\n"); + goto free_dev; + } + + dev->net_count = (int)msg.msg.version_reply.nets; + dev->version = le32_to_cpu(msg.msg.version_reply.version); + + if (device_create_file(&intf->dev, &dev_attr_firmware)) + dev_err(&intf->dev, + "Couldn't create device file for firmware\n"); + + if (device_create_file(&intf->dev, &dev_attr_hardware)) + dev_err(&intf->dev, + "Couldn't create device file for hardware\n"); + + if (device_create_file(&intf->dev, &dev_attr_nets)) + dev_err(&intf->dev, + "Couldn't create device file for nets\n"); + + /* do per device probing */ + for (i = 0; i < dev->net_count; i++) + esd_usb2_probe_one_net(intf, i); + + return 0; + +free_dev: + kfree(dev); +done: + return err; +} + +/* + * called by the usb core when the device is removed from the system + */ +static void esd_usb2_disconnect(struct usb_interface *intf) +{ + struct esd_usb2 *dev = usb_get_intfdata(intf); + struct net_device *netdev; + int i; + + device_remove_file(&intf->dev, &dev_attr_firmware); + device_remove_file(&intf->dev, &dev_attr_hardware); + device_remove_file(&intf->dev, &dev_attr_nets); + + usb_set_intfdata(intf, NULL); + + if (dev) { + for (i = 0; i < dev->net_count; i++) { + if (dev->nets[i]) { + netdev = dev->nets[i]->netdev; + unregister_netdev(netdev); + free_candev(netdev); + } + } + unlink_all_urbs(dev); + } +} + +/* usb specific object needed to register this driver with the usb subsystem */ +static struct usb_driver esd_usb2_driver = { + .name = "esd_usb2", + .probe = esd_usb2_probe, + .disconnect = esd_usb2_disconnect, + .id_table = esd_usb2_table, +}; + +static int __init esd_usb2_init(void) +{ + int err; + + /* register this driver with the USB subsystem */ + err = usb_register(&esd_usb2_driver); + + if (err) { + err("usb_register failed. Error number %d\n", err); + return err; + } + + return 0; +} +module_init(esd_usb2_init); + +static void __exit esd_usb2_exit(void) +{ + /* deregister this driver with the USB subsystem */ + usb_deregister(&esd_usb2_driver); +} +module_exit(esd_usb2_exit); |