diff options
Diffstat (limited to 'drivers/net/can/bfin_can.c')
| -rw-r--r-- | drivers/net/can/bfin_can.c | 784 |
1 files changed, 0 insertions, 784 deletions
diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c deleted file mode 100644 index 1deb8ff90a89..000000000000 --- a/drivers/net/can/bfin_can.c +++ /dev/null @@ -1,784 +0,0 @@ -/* - * Blackfin On-Chip CAN Driver - * - * Copyright 2004-2009 Analog Devices Inc. - * - * Enter bugs at http://blackfin.uclinux.org/ - * - * Licensed under the GPL-2 or later. - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/bitops.h> -#include <linux/interrupt.h> -#include <linux/errno.h> -#include <linux/netdevice.h> -#include <linux/skbuff.h> -#include <linux/platform_device.h> - -#include <linux/can/dev.h> -#include <linux/can/error.h> - -#include <asm/portmux.h> - -#define DRV_NAME "bfin_can" -#define BFIN_CAN_TIMEOUT 100 -#define TX_ECHO_SKB_MAX 1 - -/* transmit and receive channels */ -#define TRANSMIT_CHL 24 -#define RECEIVE_STD_CHL 0 -#define RECEIVE_EXT_CHL 4 -#define RECEIVE_RTR_CHL 8 -#define RECEIVE_EXT_RTR_CHL 12 -#define MAX_CHL_NUMBER 32 - -/* All Blackfin system MMRs are padded to 32bits even if the register - * itself is only 16bits. So use a helper macro to streamline this - */ -#define __BFP(m) u16 m; u16 __pad_##m - -/* bfin can registers layout */ -struct bfin_can_mask_regs { - __BFP(aml); - __BFP(amh); -}; - -struct bfin_can_channel_regs { - /* data[0,2,4,6] -> data{0,1,2,3} while data[1,3,5,7] is padding */ - u16 data[8]; - __BFP(dlc); - __BFP(tsv); - __BFP(id0); - __BFP(id1); -}; - -struct bfin_can_regs { - /* global control and status registers */ - __BFP(mc1); /* offset 0x00 */ - __BFP(md1); /* offset 0x04 */ - __BFP(trs1); /* offset 0x08 */ - __BFP(trr1); /* offset 0x0c */ - __BFP(ta1); /* offset 0x10 */ - __BFP(aa1); /* offset 0x14 */ - __BFP(rmp1); /* offset 0x18 */ - __BFP(rml1); /* offset 0x1c */ - __BFP(mbtif1); /* offset 0x20 */ - __BFP(mbrif1); /* offset 0x24 */ - __BFP(mbim1); /* offset 0x28 */ - __BFP(rfh1); /* offset 0x2c */ - __BFP(opss1); /* offset 0x30 */ - u32 __pad1[3]; - __BFP(mc2); /* offset 0x40 */ - __BFP(md2); /* offset 0x44 */ - __BFP(trs2); /* offset 0x48 */ - __BFP(trr2); /* offset 0x4c */ - __BFP(ta2); /* offset 0x50 */ - __BFP(aa2); /* offset 0x54 */ - __BFP(rmp2); /* offset 0x58 */ - __BFP(rml2); /* offset 0x5c */ - __BFP(mbtif2); /* offset 0x60 */ - __BFP(mbrif2); /* offset 0x64 */ - __BFP(mbim2); /* offset 0x68 */ - __BFP(rfh2); /* offset 0x6c */ - __BFP(opss2); /* offset 0x70 */ - u32 __pad2[3]; - __BFP(clock); /* offset 0x80 */ - __BFP(timing); /* offset 0x84 */ - __BFP(debug); /* offset 0x88 */ - __BFP(status); /* offset 0x8c */ - __BFP(cec); /* offset 0x90 */ - __BFP(gis); /* offset 0x94 */ - __BFP(gim); /* offset 0x98 */ - __BFP(gif); /* offset 0x9c */ - __BFP(control); /* offset 0xa0 */ - __BFP(intr); /* offset 0xa4 */ - __BFP(version); /* offset 0xa8 */ - __BFP(mbtd); /* offset 0xac */ - __BFP(ewr); /* offset 0xb0 */ - __BFP(esr); /* offset 0xb4 */ - u32 __pad3[2]; - __BFP(ucreg); /* offset 0xc0 */ - __BFP(uccnt); /* offset 0xc4 */ - __BFP(ucrc); /* offset 0xc8 */ - __BFP(uccnf); /* offset 0xcc */ - u32 __pad4[1]; - __BFP(version2); /* offset 0xd4 */ - u32 __pad5[10]; - - /* channel(mailbox) mask and message registers */ - struct bfin_can_mask_regs msk[MAX_CHL_NUMBER]; /* offset 0x100 */ - struct bfin_can_channel_regs chl[MAX_CHL_NUMBER]; /* offset 0x200 */ -}; - -#undef __BFP - -#define SRS 0x0001 /* Software Reset */ -#define SER 0x0008 /* Stuff Error */ -#define BOIM 0x0008 /* Enable Bus Off Interrupt */ -#define CCR 0x0080 /* CAN Configuration Mode Request */ -#define CCA 0x0080 /* Configuration Mode Acknowledge */ -#define SAM 0x0080 /* Sampling */ -#define AME 0x8000 /* Acceptance Mask Enable */ -#define RMLIM 0x0080 /* Enable RX Message Lost Interrupt */ -#define RMLIS 0x0080 /* RX Message Lost IRQ Status */ -#define RTR 0x4000 /* Remote Frame Transmission Request */ -#define BOIS 0x0008 /* Bus Off IRQ Status */ -#define IDE 0x2000 /* Identifier Extension */ -#define EPIS 0x0004 /* Error-Passive Mode IRQ Status */ -#define EPIM 0x0004 /* Enable Error-Passive Mode Interrupt */ -#define EWTIS 0x0001 /* TX Error Count IRQ Status */ -#define EWRIS 0x0002 /* RX Error Count IRQ Status */ -#define BEF 0x0040 /* Bit Error Flag */ -#define FER 0x0080 /* Form Error Flag */ -#define SMR 0x0020 /* Sleep Mode Request */ -#define SMACK 0x0008 /* Sleep Mode Acknowledge */ - -/* - * bfin can private data - */ -struct bfin_can_priv { - struct can_priv can; /* must be the first member */ - struct net_device *dev; - void __iomem *membase; - int rx_irq; - int tx_irq; - int err_irq; - unsigned short *pin_list; -}; - -/* - * bfin can timing parameters - */ -static const struct can_bittiming_const bfin_can_bittiming_const = { - .name = DRV_NAME, - .tseg1_min = 1, - .tseg1_max = 16, - .tseg2_min = 1, - .tseg2_max = 8, - .sjw_max = 4, - /* - * Although the BRP field can be set to any value, it is recommended - * that the value be greater than or equal to 4, as restrictions - * apply to the bit timing configuration when BRP is less than 4. - */ - .brp_min = 4, - .brp_max = 1024, - .brp_inc = 1, -}; - -static int bfin_can_set_bittiming(struct net_device *dev) -{ - struct bfin_can_priv *priv = netdev_priv(dev); - struct bfin_can_regs __iomem *reg = priv->membase; - struct can_bittiming *bt = &priv->can.bittiming; - u16 clk, timing; - - clk = bt->brp - 1; - timing = ((bt->sjw - 1) << 8) | (bt->prop_seg + bt->phase_seg1 - 1) | - ((bt->phase_seg2 - 1) << 4); - - /* - * If the SAM bit is set, the input signal is oversampled three times - * at the SCLK rate. - */ - if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) - timing |= SAM; - - writew(clk, ®->clock); - writew(timing, ®->timing); - - netdev_info(dev, "setting CLOCK=0x%04x TIMING=0x%04x\n", clk, timing); - - return 0; -} - -static void bfin_can_set_reset_mode(struct net_device *dev) -{ - struct bfin_can_priv *priv = netdev_priv(dev); - struct bfin_can_regs __iomem *reg = priv->membase; - int timeout = BFIN_CAN_TIMEOUT; - int i; - - /* disable interrupts */ - writew(0, ®->mbim1); - writew(0, ®->mbim2); - writew(0, ®->gim); - - /* reset can and enter configuration mode */ - writew(SRS | CCR, ®->control); - writew(CCR, ®->control); - while (!(readw(®->control) & CCA)) { - udelay(10); - if (--timeout == 0) { - netdev_err(dev, "fail to enter configuration mode\n"); - BUG(); - } - } - - /* - * All mailbox configurations are marked as inactive - * by writing to CAN Mailbox Configuration Registers 1 and 2 - * For all bits: 0 - Mailbox disabled, 1 - Mailbox enabled - */ - writew(0, ®->mc1); - writew(0, ®->mc2); - - /* Set Mailbox Direction */ - writew(0xFFFF, ®->md1); /* mailbox 1-16 are RX */ - writew(0, ®->md2); /* mailbox 17-32 are TX */ - - /* RECEIVE_STD_CHL */ - for (i = 0; i < 2; i++) { - writew(0, ®->chl[RECEIVE_STD_CHL + i].id0); - writew(AME, ®->chl[RECEIVE_STD_CHL + i].id1); - writew(0, ®->chl[RECEIVE_STD_CHL + i].dlc); - writew(0x1FFF, ®->msk[RECEIVE_STD_CHL + i].amh); - writew(0xFFFF, ®->msk[RECEIVE_STD_CHL + i].aml); - } - - /* RECEIVE_EXT_CHL */ - for (i = 0; i < 2; i++) { - writew(0, ®->chl[RECEIVE_EXT_CHL + i].id0); - writew(AME | IDE, ®->chl[RECEIVE_EXT_CHL + i].id1); - writew(0, ®->chl[RECEIVE_EXT_CHL + i].dlc); - writew(0x1FFF, ®->msk[RECEIVE_EXT_CHL + i].amh); - writew(0xFFFF, ®->msk[RECEIVE_EXT_CHL + i].aml); - } - - writew(BIT(TRANSMIT_CHL - 16), ®->mc2); - writew(BIT(RECEIVE_STD_CHL) + BIT(RECEIVE_EXT_CHL), ®->mc1); - - priv->can.state = CAN_STATE_STOPPED; -} - -static void bfin_can_set_normal_mode(struct net_device *dev) -{ - struct bfin_can_priv *priv = netdev_priv(dev); - struct bfin_can_regs __iomem *reg = priv->membase; - int timeout = BFIN_CAN_TIMEOUT; - - /* - * leave configuration mode - */ - writew(readw(®->control) & ~CCR, ®->control); - - while (readw(®->status) & CCA) { - udelay(10); - if (--timeout == 0) { - netdev_err(dev, "fail to leave configuration mode\n"); - BUG(); - } - } - - /* - * clear _All_ tx and rx interrupts - */ - writew(0xFFFF, ®->mbtif1); - writew(0xFFFF, ®->mbtif2); - writew(0xFFFF, ®->mbrif1); - writew(0xFFFF, ®->mbrif2); - - /* - * clear global interrupt status register - */ - writew(0x7FF, ®->gis); /* overwrites with '1' */ - - /* - * Initialize Interrupts - * - set bits in the mailbox interrupt mask register - * - global interrupt mask - */ - writew(BIT(RECEIVE_STD_CHL) + BIT(RECEIVE_EXT_CHL), ®->mbim1); - writew(BIT(TRANSMIT_CHL - 16), ®->mbim2); - - writew(EPIM | BOIM | RMLIM, ®->gim); -} - -static void bfin_can_start(struct net_device *dev) -{ - struct bfin_can_priv *priv = netdev_priv(dev); - - /* enter reset mode */ - if (priv->can.state != CAN_STATE_STOPPED) - bfin_can_set_reset_mode(dev); - - /* leave reset mode */ - bfin_can_set_normal_mode(dev); -} - -static int bfin_can_set_mode(struct net_device *dev, enum can_mode mode) -{ - switch (mode) { - case CAN_MODE_START: - bfin_can_start(dev); - if (netif_queue_stopped(dev)) - netif_wake_queue(dev); - break; - - default: - return -EOPNOTSUPP; - } - - return 0; -} - -static int bfin_can_get_berr_counter(const struct net_device *dev, - struct can_berr_counter *bec) -{ - struct bfin_can_priv *priv = netdev_priv(dev); - struct bfin_can_regs __iomem *reg = priv->membase; - - u16 cec = readw(®->cec); - - bec->txerr = cec >> 8; - bec->rxerr = cec; - - return 0; -} - -static int bfin_can_start_xmit(struct sk_buff *skb, struct net_device *dev) -{ - struct bfin_can_priv *priv = netdev_priv(dev); - struct bfin_can_regs __iomem *reg = priv->membase; - struct can_frame *cf = (struct can_frame *)skb->data; - u8 dlc = cf->can_dlc; - canid_t id = cf->can_id; - u8 *data = cf->data; - u16 val; - int i; - - if (can_dropped_invalid_skb(dev, skb)) - return NETDEV_TX_OK; - - netif_stop_queue(dev); - - /* fill id */ - if (id & CAN_EFF_FLAG) { - writew(id, ®->chl[TRANSMIT_CHL].id0); - val = ((id & 0x1FFF0000) >> 16) | IDE; - } else - val = (id << 2); - if (id & CAN_RTR_FLAG) - val |= RTR; - writew(val | AME, ®->chl[TRANSMIT_CHL].id1); - - /* fill payload */ - for (i = 0; i < 8; i += 2) { - val = ((7 - i) < dlc ? (data[7 - i]) : 0) + - ((6 - i) < dlc ? (data[6 - i] << 8) : 0); - writew(val, ®->chl[TRANSMIT_CHL].data[i]); - } - - /* fill data length code */ - writew(dlc, ®->chl[TRANSMIT_CHL].dlc); - - can_put_echo_skb(skb, dev, 0); - - /* set transmit request */ - writew(BIT(TRANSMIT_CHL - 16), ®->trs2); - - return 0; -} - -static void bfin_can_rx(struct net_device *dev, u16 isrc) -{ - struct bfin_can_priv *priv = netdev_priv(dev); - struct net_device_stats *stats = &dev->stats; - struct bfin_can_regs __iomem *reg = priv->membase; - struct can_frame *cf; - struct sk_buff *skb; - int obj; - int i; - u16 val; - - skb = alloc_can_skb(dev, &cf); - if (skb == NULL) - return; - - /* get id */ - if (isrc & BIT(RECEIVE_EXT_CHL)) { - /* extended frame format (EFF) */ - cf->can_id = ((readw(®->chl[RECEIVE_EXT_CHL].id1) - & 0x1FFF) << 16) - + readw(®->chl[RECEIVE_EXT_CHL].id0); - cf->can_id |= CAN_EFF_FLAG; - obj = RECEIVE_EXT_CHL; - } else { - /* standard frame format (SFF) */ - cf->can_id = (readw(®->chl[RECEIVE_STD_CHL].id1) - & 0x1ffc) >> 2; - obj = RECEIVE_STD_CHL; - } - if (readw(®->chl[obj].id1) & RTR) - cf->can_id |= CAN_RTR_FLAG; - - /* get data length code */ - cf->can_dlc = get_can_dlc(readw(®->chl[obj].dlc) & 0xF); - - /* get payload */ - for (i = 0; i < 8; i += 2) { - val = readw(®->chl[obj].data[i]); - cf->data[7 - i] = (7 - i) < cf->can_dlc ? val : 0; - cf->data[6 - i] = (6 - i) < cf->can_dlc ? (val >> 8) : 0; - } - - stats->rx_packets++; - stats->rx_bytes += cf->can_dlc; - netif_rx(skb); -} - -static int bfin_can_err(struct net_device *dev, u16 isrc, u16 status) -{ - struct bfin_can_priv *priv = netdev_priv(dev); - struct bfin_can_regs __iomem *reg = priv->membase; - struct net_device_stats *stats = &dev->stats; - struct can_frame *cf; - struct sk_buff *skb; - enum can_state state = priv->can.state; - - skb = alloc_can_err_skb(dev, &cf); - if (skb == NULL) - return -ENOMEM; - - if (isrc & RMLIS) { - /* data overrun interrupt */ - netdev_dbg(dev, "data overrun interrupt\n"); - cf->can_id |= CAN_ERR_CRTL; - cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; - stats->rx_over_errors++; - stats->rx_errors++; - } - - if (isrc & BOIS) { - netdev_dbg(dev, "bus-off mode interrupt\n"); - state = CAN_STATE_BUS_OFF; - cf->can_id |= CAN_ERR_BUSOFF; - priv->can.can_stats.bus_off++; - can_bus_off(dev); - } - - if (isrc & EPIS) { - /* error passive interrupt */ - netdev_dbg(dev, "error passive interrupt\n"); - state = CAN_STATE_ERROR_PASSIVE; - } - - if ((isrc & EWTIS) || (isrc & EWRIS)) { - netdev_dbg(dev, "Error Warning Transmit/Receive Interrupt\n"); - state = CAN_STATE_ERROR_WARNING; - } - - if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING || - state == CAN_STATE_ERROR_PASSIVE)) { - u16 cec = readw(®->cec); - u8 rxerr = cec; - u8 txerr = cec >> 8; - - cf->can_id |= CAN_ERR_CRTL; - if (state == CAN_STATE_ERROR_WARNING) { - priv->can.can_stats.error_warning++; - cf->data[1] = (txerr > rxerr) ? - CAN_ERR_CRTL_TX_WARNING : - CAN_ERR_CRTL_RX_WARNING; - } else { - priv->can.can_stats.error_passive++; - cf->data[1] = (txerr > rxerr) ? - CAN_ERR_CRTL_TX_PASSIVE : - CAN_ERR_CRTL_RX_PASSIVE; - } - } - - if (status) { - priv->can.can_stats.bus_error++; - - cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; - - if (status & BEF) - cf->data[2] |= CAN_ERR_PROT_BIT; - else if (status & FER) - cf->data[2] |= CAN_ERR_PROT_FORM; - else if (status & SER) - cf->data[2] |= CAN_ERR_PROT_STUFF; - } - - priv->can.state = state; - - stats->rx_packets++; - stats->rx_bytes += cf->can_dlc; - netif_rx(skb); - - return 0; -} - -static irqreturn_t bfin_can_interrupt(int irq, void *dev_id) -{ - struct net_device *dev = dev_id; - struct bfin_can_priv *priv = netdev_priv(dev); - struct bfin_can_regs __iomem *reg = priv->membase; - struct net_device_stats *stats = &dev->stats; - u16 status, isrc; - - if ((irq == priv->tx_irq) && readw(®->mbtif2)) { - /* transmission complete interrupt */ - writew(0xFFFF, ®->mbtif2); - stats->tx_packets++; - stats->tx_bytes += readw(®->chl[TRANSMIT_CHL].dlc); - can_get_echo_skb(dev, 0); - netif_wake_queue(dev); - } else if ((irq == priv->rx_irq) && readw(®->mbrif1)) { - /* receive interrupt */ - isrc = readw(®->mbrif1); - writew(0xFFFF, ®->mbrif1); - bfin_can_rx(dev, isrc); - } else if ((irq == priv->err_irq) && readw(®->gis)) { - /* error interrupt */ - isrc = readw(®->gis); - status = readw(®->esr); - writew(0x7FF, ®->gis); - bfin_can_err(dev, isrc, status); - } else { - return IRQ_NONE; - } - - return IRQ_HANDLED; -} - -static int bfin_can_open(struct net_device *dev) -{ - struct bfin_can_priv *priv = netdev_priv(dev); - int err; - - /* set chip into reset mode */ - bfin_can_set_reset_mode(dev); - - /* common open */ - err = open_candev(dev); - if (err) - goto exit_open; - - /* register interrupt handler */ - err = request_irq(priv->rx_irq, &bfin_can_interrupt, 0, - "bfin-can-rx", dev); - if (err) - goto exit_rx_irq; - err = request_irq(priv->tx_irq, &bfin_can_interrupt, 0, - "bfin-can-tx", dev); - if (err) - goto exit_tx_irq; - err = request_irq(priv->err_irq, &bfin_can_interrupt, 0, - "bfin-can-err", dev); - if (err) - goto exit_err_irq; - - bfin_can_start(dev); - - netif_start_queue(dev); - - return 0; - -exit_err_irq: - free_irq(priv->tx_irq, dev); -exit_tx_irq: - free_irq(priv->rx_irq, dev); -exit_rx_irq: - close_candev(dev); -exit_open: - return err; -} - -static int bfin_can_close(struct net_device *dev) -{ - struct bfin_can_priv *priv = netdev_priv(dev); - - netif_stop_queue(dev); - bfin_can_set_reset_mode(dev); - - close_candev(dev); - - free_irq(priv->rx_irq, dev); - free_irq(priv->tx_irq, dev); - free_irq(priv->err_irq, dev); - - return 0; -} - -static struct net_device *alloc_bfin_candev(void) -{ - struct net_device *dev; - struct bfin_can_priv *priv; - - dev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX); - if (!dev) - return NULL; - - priv = netdev_priv(dev); - - priv->dev = dev; - priv->can.bittiming_const = &bfin_can_bittiming_const; - priv->can.do_set_bittiming = bfin_can_set_bittiming; - priv->can.do_set_mode = bfin_can_set_mode; - priv->can.do_get_berr_counter = bfin_can_get_berr_counter; - priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; - - return dev; -} - -static const struct net_device_ops bfin_can_netdev_ops = { - .ndo_open = bfin_can_open, - .ndo_stop = bfin_can_close, - .ndo_start_xmit = bfin_can_start_xmit, - .ndo_change_mtu = can_change_mtu, -}; - -static int bfin_can_probe(struct platform_device *pdev) -{ - int err; - struct net_device *dev; - struct bfin_can_priv *priv; - struct resource *res_mem, *rx_irq, *tx_irq, *err_irq; - unsigned short *pdata; - - pdata = dev_get_platdata(&pdev->dev); - if (!pdata) { - dev_err(&pdev->dev, "No platform data provided!\n"); - err = -EINVAL; - goto exit; - } - - res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - rx_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - tx_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 1); - err_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 2); - if (!res_mem || !rx_irq || !tx_irq || !err_irq) { - err = -EINVAL; - goto exit; - } - - /* request peripheral pins */ - err = peripheral_request_list(pdata, dev_name(&pdev->dev)); - if (err) - goto exit; - - dev = alloc_bfin_candev(); - if (!dev) { - err = -ENOMEM; - goto exit_peri_pin_free; - } - - priv = netdev_priv(dev); - - priv->membase = devm_ioremap_resource(&pdev->dev, res_mem); - if (IS_ERR(priv->membase)) { - err = PTR_ERR(priv->membase); - goto exit_peri_pin_free; - } - - priv->rx_irq = rx_irq->start; - priv->tx_irq = tx_irq->start; - priv->err_irq = err_irq->start; - priv->pin_list = pdata; - priv->can.clock.freq = get_sclk(); - - platform_set_drvdata(pdev, dev); - SET_NETDEV_DEV(dev, &pdev->dev); - - dev->flags |= IFF_ECHO; /* we support local echo */ - dev->netdev_ops = &bfin_can_netdev_ops; - - bfin_can_set_reset_mode(dev); - - err = register_candev(dev); - if (err) { - dev_err(&pdev->dev, "registering failed (err=%d)\n", err); - goto exit_candev_free; - } - - dev_info(&pdev->dev, - "%s device registered" - "(®_base=%p, rx_irq=%d, tx_irq=%d, err_irq=%d, sclk=%d)\n", - DRV_NAME, priv->membase, priv->rx_irq, - priv->tx_irq, priv->err_irq, priv->can.clock.freq); - return 0; - -exit_candev_free: - free_candev(dev); -exit_peri_pin_free: - peripheral_free_list(pdata); -exit: - return err; -} - -static int bfin_can_remove(struct platform_device *pdev) -{ - struct net_device *dev = platform_get_drvdata(pdev); - struct bfin_can_priv *priv = netdev_priv(dev); - - bfin_can_set_reset_mode(dev); - - unregister_candev(dev); - - peripheral_free_list(priv->pin_list); - - free_candev(dev); - return 0; -} - -#ifdef CONFIG_PM -static int bfin_can_suspend(struct platform_device *pdev, pm_message_t mesg) -{ - struct net_device *dev = platform_get_drvdata(pdev); - struct bfin_can_priv *priv = netdev_priv(dev); - struct bfin_can_regs __iomem *reg = priv->membase; - int timeout = BFIN_CAN_TIMEOUT; - - if (netif_running(dev)) { - /* enter sleep mode */ - writew(readw(®->control) | SMR, ®->control); - while (!(readw(®->intr) & SMACK)) { - udelay(10); - if (--timeout == 0) { - netdev_err(dev, "fail to enter sleep mode\n"); - BUG(); - } - } - } - - return 0; -} - -static int bfin_can_resume(struct platform_device *pdev) -{ - struct net_device *dev = platform_get_drvdata(pdev); - struct bfin_can_priv *priv = netdev_priv(dev); - struct bfin_can_regs __iomem *reg = priv->membase; - - if (netif_running(dev)) { - /* leave sleep mode */ - writew(0, ®->intr); - } - - return 0; -} -#else -#define bfin_can_suspend NULL -#define bfin_can_resume NULL -#endif /* CONFIG_PM */ - -static struct platform_driver bfin_can_driver = { - .probe = bfin_can_probe, - .remove = bfin_can_remove, - .suspend = bfin_can_suspend, - .resume = bfin_can_resume, - .driver = { - .name = DRV_NAME, - }, -}; - -module_platform_driver(bfin_can_driver); - -MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("Blackfin on-chip CAN netdevice driver"); -MODULE_ALIAS("platform:" DRV_NAME); |