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path: root/drivers/net/can/mcp251x.c
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Diffstat (limited to 'drivers/net/can/mcp251x.c')
-rw-r--r--drivers/net/can/mcp251x.c103
1 files changed, 76 insertions, 27 deletions
diff --git a/drivers/net/can/mcp251x.c b/drivers/net/can/mcp251x.c
index b11a0cb5ed8..6aadc3e32bd 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
@@ -222,10 +225,16 @@ 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 +259,16 @@ 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 +338,20 @@ 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 +379,9 @@ 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 +424,8 @@ 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++)
@@ -451,7 +482,7 @@ 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 +705,9 @@ 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 +785,42 @@ 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 +865,14 @@ 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 +891,7 @@ 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 +974,12 @@ 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 +996,7 @@ 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 +1170,7 @@ 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 },
{ },
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-30 14:29:04 +0000