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Date: Wed, 9 Dec 2009 18:07:57 +0800
From: Barry Song <21cnbao@...il.com>
To: wg@...ndegger.com, davem@...emloft.net
CC: socketcan-core@...ts.berlios.de,
uclinux-dist-devel@...ckfin.uclinux.org, netdev@...r.kernel.org,
Barry Song <21cnbao@...il.com>, "H.J. Oertel" <oe@...t.de>
Subject: [PATCH v2] add the driver for Analog Devices Blackfin on-chip CAN controllers
Signed-off-by: Barry Song <21cnbao@...il.com>
Signed-off-by: H.J. Oertel <oe@...t.de>
---
-v2: cleanup according to Wolfgang Grandegger's feedback
1.delete some unnecessary debug print
2.delete ndo_tx_timeout entry as it is not needed in can
3.use alloc_can_skb, alloc_can_err_skb instead of netdev_alloc_skb
4.add timeout while polling can status
5.rename BFIN_CAN_READ/WRITE_MSG to bfin_can_read/write_data
6.use kernel BIT instead of bit shift
7.use void __iomem * for CAN memory base memory instead of u32
8.delete "dev->last_rx = jiffies" since it is not needed now
9.delete redundant "echo_skb" member in bfin can private data
10.follow can convention to use "_" instead of "-" for file names
drivers/net/can/Kconfig | 9 +
drivers/net/can/Makefile | 1 +
drivers/net/can/bfin_can.c | 786 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 796 insertions(+), 0 deletions(-)
create mode 100644 drivers/net/can/bfin_can.c
diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index bb803fa..8c485aa 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -54,6 +54,15 @@ config CAN_MCP251X
---help---
Driver for the Microchip MCP251x SPI CAN controllers.
+config CAN_BFIN
+ depends on CAN_DEV && (BF534 || BF536 || BF537 || BF538 || BF539 || BF54x)
+ tristate "Analog Devices Blackfin on-chip CAN"
+ ---help---
+ Driver for the Analog Devices Blackfin on-chip CAN controllers
+
+ To compile this driver as a module, choose M here: the
+ module will be called bfin_can.
+
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 56899fe..7a702f2 100644
--- a/drivers/net/can/Makefile
+++ b/drivers/net/can/Makefile
@@ -14,5 +14,6 @@ obj-$(CONFIG_CAN_MSCAN) += mscan/
obj-$(CONFIG_CAN_AT91) += at91_can.o
obj-$(CONFIG_CAN_TI_HECC) += ti_hecc.o
obj-$(CONFIG_CAN_MCP251X) += mcp251x.o
+obj-$(CONFIG_CAN_BFIN) += bfin_can.o
ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c
new file mode 100644
index 0000000..36a9f8c
--- /dev/null
+++ b/drivers/net/can/bfin_can.c
@@ -0,0 +1,786 @@
+/*
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/types.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.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
+
+/*
+ * registers offset
+ */
+#define OFFSET_MB_MASK 0x100
+#define OFFSET_MASK_AML 0x0
+#define OFFSET_MASK_AMH 0x4
+#define OFFSET_MB_OBJ 0x200
+#define OFFSET_OBJ_DATA 0x0
+#define OFFSET_OBJ_DLC 0x10
+#define OFFSET_OBJ_ID0 0x18
+#define OFFSET_OBJ_ID1 0x1C
+#define OFFSET_CLOCK 0x80
+#define OFFSET_TIMING 0x84
+#define OFFSET_STATUS 0x8C
+#define OFFSET_CEC 0x90
+#define OFFSET_GIS 0x94
+#define OFFSET_GIM 0x98
+#define OFFSET_CONTROL 0xA0
+#define OFFSET_INTR 0xA4
+#define OFFSET_ESR 0xB4
+#define OFFSET_MBIM1 0x28
+#define OFFSET_MBIM2 0x68
+#define OFFSET_MC1 0x0
+#define OFFSET_MC2 0x40
+#define OFFSET_MD1 0x4
+#define OFFSET_MD2 0x44
+#define OFFSET_TRS2 0x48
+#define OFFSET_MBTIF1 0x20
+#define OFFSET_MBTIF2 0x60
+#define OFFSET_MBRIF1 0x24
+#define OFFSET_MBRIF2 0x64
+
+/*
+ * 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
+
+/*
+ * 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;
+};
+
+/*
+ * read/write CAN registers and messages
+ */
+#define can_membase(priv) \
+ ((priv)->membase)
+#define can_channel_membase(priv, channel) \
+ ((priv)->membase + OFFSET_MB_OBJ + ((channel) << 5))
+#define can_mask_membase(priv, channel) \
+ ((priv)->membase + OFFSET_MB_MASK + ((channel) << 3))
+
+#define CAN_WRITE_REG(val, addr) \
+ writew((val), (addr))
+
+#define CAN_READ_REG(addr) \
+ readw((addr))
+
+#define CAN_WRITE_CTRL(priv, off, val) \
+ CAN_WRITE_REG(val, can_membase((priv)) + (off))
+
+#define CAN_READ_CTRL(priv, off) \
+ CAN_READ_REG(can_membase((priv)) + (off))
+
+#define CAN_WRITE_AML(priv, channel, aml) \
+ (CAN_WRITE_REG((aml), can_mask_membase(priv, channel) + OFFSET_MASK_AML))
+
+#define CAN_WRITE_AMH(priv, channel, amh) \
+ (CAN_WRITE_REG((amh), can_mask_membase(priv, channel) + OFFSET_MASK_AMH))
+
+#define CAN_WRITE_DLC(priv, channel, length) \
+ (CAN_WRITE_REG((length), can_channel_membase(priv, channel) + OFFSET_OBJ_DLC))
+
+#define CAN_READ_DLC(priv, channel) \
+ (CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_DLC))
+
+#define CAN_READ_OID(priv, channel) \
+ ((CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1) & 0x1ffc) >> 2)
+
+#define CAN_READ_XOID(priv, channel) \
+ (((CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1) & 0x1fff) << 16) \
+ + ((CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID0))))
+
+#define CAN_READ_ID1(priv, channel) \
+ (CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1))
+
+#define CAN_WRITE_ID0(priv, channel, val) \
+ CAN_WRITE_REG((val), can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID0)
+
+#define CAN_WRITE_OID(priv, channel, id) \
+ CAN_WRITE_REG(((id) << 2) | AME, can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1)
+
+#define CAN_WRITE_XOID(priv, channel, id) \
+ do { \
+ CAN_WRITE_REG((id), can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID0); \
+ CAN_WRITE_REG((((id) & 0x1FFF0000) >> 16) + IDE + AME, \
+ can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1); \
+ } while (0)
+
+#define CAN_WRITE_OID_RTR(priv, channel, id) \
+ CAN_WRITE_REG(((id) << 2) | RTR | AME, can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1)
+
+#define CAN_WRITE_XOID_RTR(priv, channel, id) \
+ do { \
+ CAN_WRITE_REG((id), can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID0); \
+ CAN_WRITE_REG((((id) & 0x1FFF0000) >> 16) + IDE + RTR + AME, \
+ can_channel_membase((priv), (channel)) + OFFSET_OBJ_ID1); \
+ } while (0)
+
+static 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 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;
+
+ CAN_WRITE_CTRL(priv, OFFSET_CLOCK, clk);
+ CAN_WRITE_CTRL(priv, OFFSET_TIMING, timing);
+
+ dev_info(dev->dev.parent, "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);
+ int i;
+ int timeout = BFIN_CAN_TIMEOUT;
+
+ /* disable interrupts */
+ CAN_WRITE_CTRL(priv, OFFSET_MBIM1, 0);
+ CAN_WRITE_CTRL(priv, OFFSET_MBIM2, 0);
+ CAN_WRITE_CTRL(priv, OFFSET_GIM, 0);
+
+ /* reset can and enter configuration mode */
+ CAN_WRITE_CTRL(priv, OFFSET_CONTROL, SRS | CCR);
+ SSYNC();
+ CAN_WRITE_CTRL(priv, OFFSET_CONTROL, CCR);
+ SSYNC();
+ while (!(CAN_READ_CTRL(priv, OFFSET_CONTROL) & CCA)) {
+ udelay(10);
+ if (--timeout == 0) {
+ dev_err(dev->dev.parent, "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
+ */
+ CAN_WRITE_CTRL(priv, OFFSET_MC1, 0);
+ CAN_WRITE_CTRL(priv, OFFSET_MC2, 0);
+
+ /* Set Mailbox Direction */
+ CAN_WRITE_CTRL(priv, OFFSET_MD1, 0xFFFF); /* mailbox 1-16 are RX */
+ CAN_WRITE_CTRL(priv, OFFSET_MD2, 0); /* mailbox 17-32 are TX */
+
+ /* RECEIVE_STD_CHL */
+ for (i = 0; i < 2; i++) {
+ CAN_WRITE_OID(priv, RECEIVE_STD_CHL + i, 0);
+ CAN_WRITE_ID0(priv, RECEIVE_STD_CHL, 0);
+ CAN_WRITE_DLC(priv, RECEIVE_STD_CHL + i, 0);
+ CAN_WRITE_AMH(priv, RECEIVE_STD_CHL + i, 0x1FFF);
+ CAN_WRITE_AML(priv, RECEIVE_STD_CHL + i, 0xFFFF);
+ }
+
+ /* RECEIVE_EXT_CHL */
+ for (i = 0; i < 2; i++) {
+ CAN_WRITE_XOID(priv, RECEIVE_EXT_CHL + i, 0);
+ CAN_WRITE_DLC(priv, RECEIVE_EXT_CHL + i, 0);
+ CAN_WRITE_AMH(priv, RECEIVE_EXT_CHL + i, 0x1FFF);
+ CAN_WRITE_AML(priv, RECEIVE_EXT_CHL + i, 0xFFFF);
+ }
+
+ CAN_WRITE_CTRL(priv, OFFSET_MC2, BIT(TRANSMIT_CHL - 16));
+ CAN_WRITE_CTRL(priv, OFFSET_MC1, BIT(RECEIVE_STD_CHL) + BIT(RECEIVE_EXT_CHL));
+ SSYNC();
+
+ 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);
+ int timeout = BFIN_CAN_TIMEOUT;
+
+ /*
+ * leave configuration mode
+ */
+ CAN_WRITE_CTRL(priv, OFFSET_CONTROL, CAN_READ_CTRL(priv, OFFSET_CONTROL) & ~CCR);
+
+ while (CAN_READ_CTRL(priv, OFFSET_STATUS) & CCA) {
+ udelay(10);
+ if (--timeout == 0) {
+ dev_err(dev->dev.parent, "fail to leave configuration mode\n");
+ BUG();
+ }
+ }
+
+ /*
+ * clear _All_ tx and rx interrupts
+ */
+ CAN_WRITE_CTRL(priv, OFFSET_MBTIF1, 0xFFFF);
+ CAN_WRITE_CTRL(priv, OFFSET_MBTIF2, 0xFFFF);
+ CAN_WRITE_CTRL(priv, OFFSET_MBRIF1, 0xFFFF);
+ CAN_WRITE_CTRL(priv, OFFSET_MBRIF2, 0xFFFF);
+
+ /*
+ * clear global interrupt status register
+ */
+ CAN_WRITE_CTRL(priv, OFFSET_GIS, 0x7FF); /* overwrites with '1' */
+
+ /*
+ * Initialize Interrupts
+ * - set bits in the mailbox interrupt mask register
+ * - global interrupt mask
+ */
+ CAN_WRITE_CTRL(priv, OFFSET_MBIM1, BIT(RECEIVE_STD_CHL) + BIT(RECEIVE_EXT_CHL));
+ CAN_WRITE_CTRL(priv, OFFSET_MBIM2, BIT(TRANSMIT_CHL - 16));
+
+ CAN_WRITE_CTRL(priv, OFFSET_GIM, EPIM | BOIM | RMLIM);
+ SSYNC();
+}
+
+static inline void bfin_can_write_data(struct bfin_can_priv *priv, int channel, u8 *data, int dlc)
+{
+ int i;
+ u16 val;
+
+ for (i = 0; i < 8; i += 2) {
+ val = ((7 - i) < dlc ? (data[7 - i]) : 0) +
+ ((6 - i) < dlc ? (data[6 - i] << 8) : 0);
+ CAN_WRITE_REG(val, can_channel_membase((priv), (channel)) + OFFSET_OBJ_DATA + (i << 1));
+ }
+}
+
+static inline void bfin_can_read_data(struct bfin_can_priv *priv, int channel, u8 *data, int dlc)
+{
+ int i;
+ u16 val;
+
+ for (i = 0; i < 8; i += 2) {
+ val = CAN_READ_REG(can_channel_membase((priv), (channel)) + OFFSET_OBJ_DATA + (i << 1));
+ data[7 - i] = (7 - i) < dlc ? val : 0;
+ data[6 - i] = (6 - i) < dlc ? (val >> 8) : 0;
+ }
+}
+
+static void bfin_can_start(struct net_device *dev)
+{
+ struct bfin_can_priv *priv = netdev_priv(dev);
+
+ /* leave 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_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct bfin_can_priv *priv = netdev_priv(dev);
+ struct can_frame *cf = (struct can_frame *)skb->data;
+ u8 dlc;
+ canid_t id;
+
+ netif_stop_queue(dev);
+
+ dlc = cf->can_dlc;
+ id = cf->can_id;
+
+ /* fill id and data length code */
+ if (id & CAN_EFF_FLAG) {
+ if (id & CAN_RTR_FLAG)
+ CAN_WRITE_XOID_RTR(priv, TRANSMIT_CHL, id);
+ else
+ CAN_WRITE_XOID(priv, TRANSMIT_CHL, id);
+ } else {
+ if (id & CAN_RTR_FLAG)
+ CAN_WRITE_OID_RTR(priv, TRANSMIT_CHL, id);
+ else
+ CAN_WRITE_OID(priv, TRANSMIT_CHL, id);
+ }
+
+ bfin_can_write_data(priv, TRANSMIT_CHL, cf->data, dlc);
+
+ CAN_WRITE_DLC(priv, TRANSMIT_CHL, dlc);
+
+ dev->trans_start = jiffies;
+
+ can_put_echo_skb(skb, dev, 0);
+
+ /* set transmit request */
+ CAN_WRITE_CTRL(priv, OFFSET_TRS2, BIT(TRANSMIT_CHL - 16));
+ return 0;
+}
+
+static void bfin_can_rx(struct net_device *dev, uint16_t isrc)
+{
+ struct bfin_can_priv *priv = netdev_priv(dev);
+ struct net_device_stats *stats = &dev->stats;
+ struct can_frame *cf;
+ struct sk_buff *skb;
+ canid_t id;
+ uint8_t dlc;
+ int obj;
+
+ skb = alloc_can_skb(dev, &cf);
+ if (skb == NULL)
+ return;
+
+ /* get id and data length code */
+ if (isrc & BIT(RECEIVE_EXT_CHL)) {
+ /* extended frame format (EFF) */
+ id = CAN_READ_XOID(priv, RECEIVE_EXT_CHL);
+ id |= CAN_EFF_FLAG;
+ obj = RECEIVE_EXT_CHL;
+ } else {
+ /* standard frame format (SFF) */
+ id = CAN_READ_OID(priv, RECEIVE_STD_CHL);
+ obj = RECEIVE_STD_CHL;
+ }
+ if (CAN_READ_ID1(priv, obj) & RTR)
+ id |= CAN_RTR_FLAG;
+ dlc = CAN_READ_DLC(priv, obj);
+
+ cf->can_id = id;
+ cf->can_dlc = dlc;
+
+ bfin_can_read_data(priv, obj, cf->data, dlc);
+
+ netif_rx(skb);
+
+ stats->rx_packets++;
+ stats->rx_bytes += dlc;
+}
+
+static int bfin_can_err(struct net_device *dev, uint16_t isrc, uint16_t status)
+{
+ struct bfin_can_priv *priv = netdev_priv(dev);
+ 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 */
+ dev_dbg(dev->dev.parent, "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) {
+ dev_dbg(dev->dev.parent, "bus-off mode interrupt\n");
+
+ state = CAN_STATE_BUS_OFF;
+ cf->can_id |= CAN_ERR_BUSOFF;
+ can_bus_off(dev);
+ }
+
+ if (isrc & EPIS) {
+ /* error passive interrupt */
+ dev_dbg(dev->dev.parent, "error passive interrupt\n");
+ state = CAN_STATE_ERROR_PASSIVE;
+ }
+
+ if ((isrc & EWTIS) || (isrc & EWRIS)) {
+ dev_dbg(dev->dev.parent, "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)) {
+ uint16_t cec = CAN_READ_CTRL(priv, OFFSET_CEC);
+ uint8_t rxerr = cec;
+ uint8_t 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;
+ else
+ cf->data[2] |= CAN_ERR_PROT_UNSPEC;
+ }
+
+ priv->can.state = state;
+
+ netif_rx(skb);
+
+ stats->rx_packets++;
+ stats->rx_bytes += cf->can_dlc;
+
+ return 0;
+}
+
+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 net_device_stats *stats = &dev->stats;
+ uint16_t status, isrc;
+
+ if ((irq == priv->tx_irq) && CAN_READ_CTRL(priv, OFFSET_MBTIF2)) {
+ /* transmission complete interrupt */
+ CAN_WRITE_CTRL(priv, OFFSET_MBTIF2, 0xFFFF);
+ stats->tx_packets++;
+ stats->tx_bytes += CAN_READ_DLC(priv, TRANSMIT_CHL);
+ can_get_echo_skb(dev, 0);
+ netif_wake_queue(dev);
+ } else if ((irq == priv->rx_irq) && CAN_READ_CTRL(priv, OFFSET_MBRIF1)) {
+ /* receive interrupt */
+ isrc = CAN_READ_CTRL(priv, OFFSET_MBRIF1);
+ CAN_WRITE_CTRL(priv, OFFSET_MBRIF1, 0xFFFF);
+ bfin_can_rx(dev, isrc);
+ } else if ((irq == priv->err_irq) && CAN_READ_CTRL(priv, OFFSET_GIS)) {
+ /* error interrupt */
+ isrc = CAN_READ_CTRL(priv, OFFSET_GIS);
+ status = CAN_READ_CTRL(priv, OFFSET_ESR);
+ CAN_WRITE_CTRL(priv, OFFSET_GIS, 0x7FF);
+ bfin_can_err(dev, isrc, status);
+ } else
+ return IRQ_NONE;
+
+ return IRQ_HANDLED;
+}
+
+static int bfin_can_open(struct net_device *dev)
+{
+ int err;
+
+ /* set chip into reset mode */
+ bfin_can_set_reset_mode(dev);
+
+ /* common open */
+ err = open_candev(dev);
+ if (err)
+ return err;
+
+ /* init and start chi */
+ bfin_can_start(dev);
+
+ netif_start_queue(dev);
+
+ return 0;
+}
+
+static int bfin_can_close(struct net_device *dev)
+{
+ netif_stop_queue(dev);
+ bfin_can_set_reset_mode(dev);
+
+ close_candev(dev);
+
+ return 0;
+}
+
+struct net_device *alloc_bfin_candev(void)
+{
+ struct net_device *dev;
+ struct bfin_can_priv *priv;
+
+ dev = alloc_candev(sizeof(*priv));
+ 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;
+
+ 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,
+};
+
+static int __devinit 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 = pdev->dev.platform_data;
+ 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;
+ }
+
+ if (!request_mem_region(res_mem->start, resource_size(res_mem),
+ dev_name(&pdev->dev))) {
+ err = -EBUSY;
+ goto exit;
+ }
+
+ /* request peripheral pins */
+ err = peripheral_request_list(pdata, dev_name(&pdev->dev));
+ if (err)
+ goto exit_mem_release;
+
+ dev = alloc_bfin_candev();
+ if (!dev) {
+ err = -ENOMEM;
+ goto exit_peri_pin_free;
+ }
+
+ /* register interrupt handler */
+ err = request_irq(rx_irq->start, &bfin_can_interrupt, 0,
+ "bfin-can-rx", (void *)dev);
+ if (err)
+ goto exit_candev_free;
+ err = request_irq(tx_irq->start, &bfin_can_interrupt, 0,
+ "bfin-can-tx", (void *)dev);
+ if (err)
+ goto exit_rx_irq_free;
+ err = request_irq(err_irq->start, &bfin_can_interrupt, 0,
+ "bfin-can-err", (void *)dev);
+ if (err)
+ goto exit_tx_irq_free;
+
+ priv = netdev_priv(dev);
+ priv->membase = (void __iomem *)res_mem->start;
+ 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();
+
+ dev_set_drvdata(&pdev->dev, 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_err_irq_free;
+ }
+
+ dev_info(&pdev->dev, "%s device registered (reg_base=%p, rx_irq=%d, tx_irq=%d, err_irq=%d, sclk=%d)\n",
+ DRV_NAME, (void *)priv->membase, priv->rx_irq, priv->tx_irq, priv->err_irq,
+ priv->can.clock.freq);
+ return 0;
+
+exit_err_irq_free:
+ free_irq(err_irq->start, dev);
+exit_tx_irq_free:
+ free_irq(tx_irq->start, dev);
+exit_rx_irq_free:
+ free_irq(rx_irq->start, dev);
+exit_candev_free:
+ free_candev(dev);
+exit_peri_pin_free:
+ peripheral_free_list(pdata);
+exit_mem_release:
+ release_mem_region(res_mem->start, resource_size(res_mem));
+exit:
+ return err;
+}
+
+static int __devexit bfin_can_remove(struct platform_device *pdev)
+{
+ struct net_device *dev = dev_get_drvdata(&pdev->dev);
+ struct bfin_can_priv *priv = netdev_priv(dev);
+ struct resource *res;
+
+ bfin_can_set_reset_mode(dev);
+
+ unregister_candev(dev);
+
+ dev_set_drvdata(&pdev->dev, NULL);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(res->start, resource_size(res));
+
+ free_irq(priv->rx_irq, dev);
+ free_irq(priv->tx_irq, dev);
+ free_irq(priv->err_irq, 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 = dev_get_drvdata(&pdev->dev);
+ struct bfin_can_priv *priv = netdev_priv(dev);
+ int timeout = BFIN_CAN_TIMEOUT;
+
+ if (netif_running(dev)) {
+ /* enter sleep mode */
+ CAN_WRITE_CTRL(priv, OFFSET_CONTROL,
+ CAN_READ_CTRL(priv, OFFSET_CONTROL) | SMR);
+ SSYNC();
+ while (!(CAN_READ_CTRL(priv, OFFSET_INTR) & SMACK)) {
+ udelay(10);
+ if (--timeout == 0) {
+ dev_err(dev->dev.parent, "fail to enter sleep mode\n");
+ BUG();
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int bfin_can_resume(struct platform_device *pdev)
+{
+ struct net_device *dev = dev_get_drvdata(&pdev->dev);
+ struct bfin_can_priv *priv = netdev_priv(dev);
+
+ if (netif_running(dev)) {
+ /* leave sleep mode */
+ CAN_WRITE_CTRL(priv, OFFSET_INTR, 0);
+ SSYNC();
+ }
+
+ 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 = __devexit_p(bfin_can_remove),
+ .suspend = bfin_can_suspend,
+ .resume = bfin_can_resume,
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init bfin_can_init(void)
+{
+ return platform_driver_register(&bfin_can_driver);
+}
+
+module_init(bfin_can_init);
+
+static void __exit bfin_can_exit(void)
+{
+ platform_driver_unregister(&bfin_can_driver);
+}
+
+module_exit(bfin_can_exit);
+
+MODULE_AUTHOR("Barry Song <21cnbao@...il.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Blackfin on-chip CAN netdevice driver");
+
--
1.5.6.3
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