diff options
Diffstat (limited to 'drivers/net/can/mcp251x.c')
-rw-r--r-- | drivers/net/can/mcp251x.c | 106 |
1 files changed, 79 insertions, 27 deletions
diff --git a/drivers/net/can/mcp251x.c b/drivers/net/can/mcp251x.c index b11a0cb5ed81..7ab534aee452 100644 --- a/drivers/net/can/mcp251x.c +++ b/drivers/net/can/mcp251x.c @@ -38,14 +38,14 @@ * static struct mcp251x_platform_data mcp251x_info = { * .oscillator_frequency = 8000000, * .board_specific_setup = &mcp251x_setup, - * .model = CAN_MCP251X_MCP2510, * .power_enable = mcp251x_power_enable, * .transceiver_enable = NULL, * }; * * static struct spi_board_info spi_board_info[] = { * { - * .modalias = "mcp251x", + * .modalias = "mcp2510", + * // or "mcp2515" depending on your controller * .platform_data = &mcp251x_info, * .irq = IRQ_EINT13, * .max_speed_hz = 2*1000*1000, @@ -125,6 +125,9 @@ # define CANINTF_TX0IF 0x04 # define CANINTF_RX1IF 0x02 # define CANINTF_RX0IF 0x01 +# define CANINTF_RX (CANINTF_RX0IF | CANINTF_RX1IF) +# define CANINTF_TX (CANINTF_TX2IF | CANINTF_TX1IF | CANINTF_TX0IF) +# define CANINTF_ERR (CANINTF_ERRIF) #define EFLG 0x2d # define EFLG_EWARN 0x01 # define EFLG_RXWAR 0x02 @@ -166,6 +169,7 @@ # define RXBSIDH_SHIFT 3 #define RXBSIDL(n) (((n) * 0x10) + 0x60 + RXBSIDL_OFF) # define RXBSIDL_IDE 0x08 +# define RXBSIDL_SRR 0x10 # define RXBSIDL_EID 3 # define RXBSIDL_SHIFT 5 #define RXBEID8(n) (((n) * 0x10) + 0x60 + RXBEID8_OFF) @@ -222,10 +226,16 @@ static struct can_bittiming_const mcp251x_bittiming_const = { .brp_inc = 1, }; +enum mcp251x_model { + CAN_MCP251X_MCP2510 = 0x2510, + CAN_MCP251X_MCP2515 = 0x2515, +}; + struct mcp251x_priv { struct can_priv can; struct net_device *net; struct spi_device *spi; + enum mcp251x_model model; struct mutex mcp_lock; /* SPI device lock */ @@ -250,6 +260,16 @@ struct mcp251x_priv { int restart_tx; }; +#define MCP251X_IS(_model) \ +static inline int mcp251x_is_##_model(struct spi_device *spi) \ +{ \ + struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); \ + return priv->model == CAN_MCP251X_MCP##_model; \ +} + +MCP251X_IS(2510); +MCP251X_IS(2515); + static void mcp251x_clean(struct net_device *net) { struct mcp251x_priv *priv = netdev_priv(net); @@ -319,6 +339,20 @@ static u8 mcp251x_read_reg(struct spi_device *spi, uint8_t reg) return val; } +static void mcp251x_read_2regs(struct spi_device *spi, uint8_t reg, + uint8_t *v1, uint8_t *v2) +{ + struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); + + priv->spi_tx_buf[0] = INSTRUCTION_READ; + priv->spi_tx_buf[1] = reg; + + mcp251x_spi_trans(spi, 4); + + *v1 = priv->spi_rx_buf[2]; + *v2 = priv->spi_rx_buf[3]; +} + static void mcp251x_write_reg(struct spi_device *spi, u8 reg, uint8_t val) { struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); @@ -346,10 +380,9 @@ static void mcp251x_write_bits(struct spi_device *spi, u8 reg, static void mcp251x_hw_tx_frame(struct spi_device *spi, u8 *buf, int len, int tx_buf_idx) { - struct mcp251x_platform_data *pdata = spi->dev.platform_data; struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); - if (pdata->model == CAN_MCP251X_MCP2510) { + if (mcp251x_is_2510(spi)) { int i; for (i = 1; i < TXBDAT_OFF + len; i++) @@ -392,9 +425,8 @@ static void mcp251x_hw_rx_frame(struct spi_device *spi, u8 *buf, int buf_idx) { struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); - struct mcp251x_platform_data *pdata = spi->dev.platform_data; - if (pdata->model == CAN_MCP251X_MCP2510) { + if (mcp251x_is_2510(spi)) { int i, len; for (i = 1; i < RXBDAT_OFF; i++) @@ -444,6 +476,8 @@ static void mcp251x_hw_rx(struct spi_device *spi, int buf_idx) frame->can_id = (buf[RXBSIDH_OFF] << RXBSIDH_SHIFT) | (buf[RXBSIDL_OFF] >> RXBSIDL_SHIFT); + if (buf[RXBSIDL_OFF] & RXBSIDL_SRR) + frame->can_id |= CAN_RTR_FLAG; } /* Data length */ frame->can_dlc = get_can_dlc(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK); @@ -451,7 +485,7 @@ static void mcp251x_hw_rx(struct spi_device *spi, int buf_idx) priv->net->stats.rx_packets++; priv->net->stats.rx_bytes += frame->can_dlc; - netif_rx(skb); + netif_rx_ni(skb); } static void mcp251x_hw_sleep(struct spi_device *spi) @@ -674,9 +708,9 @@ static void mcp251x_error_skb(struct net_device *net, int can_id, int data1) skb = alloc_can_err_skb(net, &frame); if (skb) { - frame->can_id = can_id; + frame->can_id |= can_id; frame->data[1] = data1; - netif_rx(skb); + netif_rx_ni(skb); } else { dev_err(&net->dev, "cannot allocate error skb\n"); @@ -754,24 +788,42 @@ static irqreturn_t mcp251x_can_ist(int irq, void *dev_id) mutex_lock(&priv->mcp_lock); while (!priv->force_quit) { enum can_state new_state; - u8 intf = mcp251x_read_reg(spi, CANINTF); - u8 eflag; + u8 intf, eflag; + u8 clear_intf = 0; int can_id = 0, data1 = 0; + mcp251x_read_2regs(spi, CANINTF, &intf, &eflag); + + /* mask out flags we don't care about */ + intf &= CANINTF_RX | CANINTF_TX | CANINTF_ERR; + + /* receive buffer 0 */ if (intf & CANINTF_RX0IF) { mcp251x_hw_rx(spi, 0); - /* Free one buffer ASAP */ - mcp251x_write_bits(spi, CANINTF, intf & CANINTF_RX0IF, - 0x00); + /* + * Free one buffer ASAP + * (The MCP2515 does this automatically.) + */ + if (mcp251x_is_2510(spi)) + mcp251x_write_bits(spi, CANINTF, CANINTF_RX0IF, 0x00); } - if (intf & CANINTF_RX1IF) + /* receive buffer 1 */ + if (intf & CANINTF_RX1IF) { mcp251x_hw_rx(spi, 1); + /* the MCP2515 does this automatically */ + if (mcp251x_is_2510(spi)) + clear_intf |= CANINTF_RX1IF; + } - mcp251x_write_bits(spi, CANINTF, intf, 0x00); + /* any error or tx interrupt we need to clear? */ + if (intf & (CANINTF_ERR | CANINTF_TX)) + clear_intf |= intf & (CANINTF_ERR | CANINTF_TX); + if (clear_intf) + mcp251x_write_bits(spi, CANINTF, clear_intf, 0x00); - eflag = mcp251x_read_reg(spi, EFLG); - mcp251x_write_reg(spi, EFLG, 0x00); + if (eflag) + mcp251x_write_bits(spi, EFLG, eflag, 0x00); /* Update can state */ if (eflag & EFLG_TXBO) { @@ -816,10 +868,14 @@ static irqreturn_t mcp251x_can_ist(int irq, void *dev_id) if (intf & CANINTF_ERRIF) { /* Handle overflow counters */ if (eflag & (EFLG_RX0OVR | EFLG_RX1OVR)) { - if (eflag & EFLG_RX0OVR) + if (eflag & EFLG_RX0OVR) { net->stats.rx_over_errors++; - if (eflag & EFLG_RX1OVR) + net->stats.rx_errors++; + } + if (eflag & EFLG_RX1OVR) { net->stats.rx_over_errors++; + net->stats.rx_errors++; + } can_id |= CAN_ERR_CRTL; data1 |= CAN_ERR_CRTL_RX_OVERFLOW; } @@ -838,7 +894,7 @@ static irqreturn_t mcp251x_can_ist(int irq, void *dev_id) if (intf == 0) break; - if (intf & (CANINTF_TX2IF | CANINTF_TX1IF | CANINTF_TX0IF)) { + if (intf & CANINTF_TX) { net->stats.tx_packets++; net->stats.tx_bytes += priv->tx_len - 1; if (priv->tx_len) { @@ -921,16 +977,12 @@ static int __devinit mcp251x_can_probe(struct spi_device *spi) struct net_device *net; struct mcp251x_priv *priv; struct mcp251x_platform_data *pdata = spi->dev.platform_data; - int model = spi_get_device_id(spi)->driver_data; int ret = -ENODEV; if (!pdata) /* Platform data is required for osc freq */ goto error_out; - if (model) - pdata->model = model; - /* Allocate can/net device */ net = alloc_candev(sizeof(struct mcp251x_priv), TX_ECHO_SKB_MAX); if (!net) { @@ -947,6 +999,7 @@ static int __devinit mcp251x_can_probe(struct spi_device *spi) priv->can.clock.freq = pdata->oscillator_frequency / 2; priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY; + priv->model = spi_get_device_id(spi)->driver_data; priv->net = net; dev_set_drvdata(&spi->dev, priv); @@ -1120,8 +1173,7 @@ static int mcp251x_can_resume(struct spi_device *spi) #define mcp251x_can_resume NULL #endif -static struct spi_device_id mcp251x_id_table[] = { - { "mcp251x", 0 /* Use pdata.model */ }, +static const struct spi_device_id mcp251x_id_table[] = { { "mcp2510", CAN_MCP251X_MCP2510 }, { "mcp2515", CAN_MCP251X_MCP2515 }, { }, |