diff options
Diffstat (limited to 'drivers/net/can/c_can/c_can.c')
| -rw-r--r-- | drivers/net/can/c_can/c_can.c | 130 |
1 files changed, 125 insertions, 5 deletions
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c index 4c538e3..e5180dfd 100644 --- a/drivers/net/can/c_can/c_can.c +++ b/drivers/net/can/c_can/c_can.c @@ -34,6 +34,7 @@ #include <linux/if_ether.h> #include <linux/list.h> #include <linux/io.h> +#include <linux/pm_runtime.h> #include <linux/can.h> #include <linux/can/dev.h> @@ -45,6 +46,9 @@ #define IF_ENUM_REG_LEN 11 #define C_CAN_IFACE(reg, iface) (C_CAN_IF1_##reg + (iface) * IF_ENUM_REG_LEN) +/* control extension register D_CAN specific */ +#define CONTROL_EX_PDR BIT(8) + /* control register */ #define CONTROL_TEST BIT(7) #define CONTROL_CCE BIT(6) @@ -64,6 +68,7 @@ #define TEST_BASIC BIT(2) /* status register */ +#define STATUS_PDA BIT(10) #define STATUS_BOFF BIT(7) #define STATUS_EWARN BIT(6) #define STATUS_EPASS BIT(5) @@ -163,6 +168,9 @@ /* minimum timeout for checking BUSY status */ #define MIN_TIMEOUT_VALUE 6 +/* Wait for ~1 sec for INIT bit */ +#define INIT_WAIT_MS 1000 + /* napi related */ #define C_CAN_NAPI_WEIGHT C_CAN_MSG_OBJ_RX_NUM @@ -201,6 +209,30 @@ static const struct can_bittiming_const c_can_bittiming_const = { .brp_inc = 1, }; +static inline void c_can_pm_runtime_enable(const struct c_can_priv *priv) +{ + if (priv->device) + pm_runtime_enable(priv->device); +} + +static inline void c_can_pm_runtime_disable(const struct c_can_priv *priv) +{ + if (priv->device) + pm_runtime_disable(priv->device); +} + +static inline void c_can_pm_runtime_get_sync(const struct c_can_priv *priv) +{ + if (priv->device) + pm_runtime_get_sync(priv->device); +} + +static inline void c_can_pm_runtime_put_sync(const struct c_can_priv *priv) +{ + if (priv->device) + pm_runtime_put_sync(priv->device); +} + static inline int get_tx_next_msg_obj(const struct c_can_priv *priv) { return (priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) + @@ -673,11 +705,15 @@ static int c_can_get_berr_counter(const struct net_device *dev, unsigned int reg_err_counter; struct c_can_priv *priv = netdev_priv(dev); + c_can_pm_runtime_get_sync(priv); + reg_err_counter = priv->read_reg(priv, C_CAN_ERR_CNT_REG); bec->rxerr = (reg_err_counter & ERR_CNT_REC_MASK) >> ERR_CNT_REC_SHIFT; bec->txerr = reg_err_counter & ERR_CNT_TEC_MASK; + c_can_pm_runtime_put_sync(priv); + return 0; } @@ -1053,11 +1089,13 @@ static int c_can_open(struct net_device *dev) int err; struct c_can_priv *priv = netdev_priv(dev); + c_can_pm_runtime_get_sync(priv); + /* open the can device */ err = open_candev(dev); if (err) { netdev_err(dev, "failed to open can device\n"); - return err; + goto exit_open_fail; } /* register interrupt handler */ @@ -1079,6 +1117,8 @@ static int c_can_open(struct net_device *dev) exit_irq_fail: close_candev(dev); +exit_open_fail: + c_can_pm_runtime_put_sync(priv); return err; } @@ -1091,6 +1131,7 @@ static int c_can_close(struct net_device *dev) c_can_stop(dev); free_irq(dev->irq, dev); close_candev(dev); + c_can_pm_runtime_put_sync(priv); return 0; } @@ -1119,6 +1160,77 @@ struct net_device *alloc_c_can_dev(void) } EXPORT_SYMBOL_GPL(alloc_c_can_dev); +#ifdef CONFIG_PM +int c_can_power_down(struct net_device *dev) +{ + u32 val; + unsigned long time_out; + struct c_can_priv *priv = netdev_priv(dev); + + if (!(dev->flags & IFF_UP)) + return 0; + + WARN_ON(priv->type != BOSCH_D_CAN); + + /* set PDR value so the device goes to power down mode */ + val = priv->read_reg(priv, C_CAN_CTRL_EX_REG); + val |= CONTROL_EX_PDR; + priv->write_reg(priv, C_CAN_CTRL_EX_REG, val); + + /* Wait for the PDA bit to get set */ + time_out = jiffies + msecs_to_jiffies(INIT_WAIT_MS); + while (!(priv->read_reg(priv, C_CAN_STS_REG) & STATUS_PDA) && + time_after(time_out, jiffies)) + cpu_relax(); + + if (time_after(jiffies, time_out)) + return -ETIMEDOUT; + + c_can_stop(dev); + + c_can_pm_runtime_put_sync(priv); + + return 0; +} +EXPORT_SYMBOL_GPL(c_can_power_down); + +int c_can_power_up(struct net_device *dev) +{ + u32 val; + unsigned long time_out; + struct c_can_priv *priv = netdev_priv(dev); + + if (!(dev->flags & IFF_UP)) + return 0; + + WARN_ON(priv->type != BOSCH_D_CAN); + + c_can_pm_runtime_get_sync(priv); + + /* Clear PDR and INIT bits */ + val = priv->read_reg(priv, C_CAN_CTRL_EX_REG); + val &= ~CONTROL_EX_PDR; + priv->write_reg(priv, C_CAN_CTRL_EX_REG, val); + val = priv->read_reg(priv, C_CAN_CTRL_REG); + val &= ~CONTROL_INIT; + priv->write_reg(priv, C_CAN_CTRL_REG, val); + + /* Wait for the PDA bit to get clear */ + time_out = jiffies + msecs_to_jiffies(INIT_WAIT_MS); + while ((priv->read_reg(priv, C_CAN_STS_REG) & STATUS_PDA) && + time_after(time_out, jiffies)) + cpu_relax(); + + if (time_after(jiffies, time_out)) + return -ETIMEDOUT; + + c_can_start(dev); + + return 0; +} +EXPORT_SYMBOL_GPL(c_can_power_up); +#endif + void free_c_can_dev(struct net_device *dev) { free_candev(dev); @@ -1133,10 +1245,19 @@ static const struct net_device_ops c_can_netdev_ops = { int register_c_can_dev(struct net_device *dev) { + struct c_can_priv *priv = netdev_priv(dev); + int err; + + c_can_pm_runtime_enable(priv); + dev->flags |= IFF_ECHO; /* we support local echo */ dev->netdev_ops = &c_can_netdev_ops; - return register_candev(dev); + err = register_candev(dev); + if (err) + c_can_pm_runtime_disable(priv); + + return err; } EXPORT_SYMBOL_GPL(register_c_can_dev); @@ -1144,10 +1265,9 @@ void unregister_c_can_dev(struct net_device *dev) { struct c_can_priv *priv = netdev_priv(dev); - /* disable all interrupts */ - c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS); - unregister_candev(dev); + + c_can_pm_runtime_disable(priv); } EXPORT_SYMBOL_GPL(unregister_c_can_dev); |
