From 4cdd34b26826e89972c03043987b83f76e7ad510 Mon Sep 17 00:00:00 2001 From: AnilKumar Ch Date: Mon, 20 Aug 2012 16:50:54 +0530 Subject: [PATCH] can: c_can: Add runtime PM support to Bosch C_CAN/D_CAN controller Add Runtime PM support to C_CAN/D_CAN controller. The runtime PM APIs control clocks for C_CAN/D_CAN IP and prevent access to the register of C_CAN/D_CAN IP when clock is turned off. Signed-off-by: AnilKumar Ch Signed-off-by: Marc Kleine-Budde --- drivers/net/can/c_can/c_can.c | 49 ++++++++++++++++++++++++-- drivers/net/can/c_can/c_can.h | 1 + drivers/net/can/c_can/c_can_platform.c | 1 + 3 files changed, 49 insertions(+), 2 deletions(-) diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c index 4c538e388655..768bb481b077 100644 --- a/drivers/net/can/c_can/c_can.c +++ b/drivers/net/can/c_can/c_can.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #include @@ -201,6 +202,30 @@ 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 +698,15 @@ 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 +1082,13 @@ 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 +1110,8 @@ 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 +1124,7 @@ 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; } @@ -1133,10 +1167,19 @@ 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); @@ -1148,6 +1191,8 @@ void unregister_c_can_dev(struct net_device *dev) 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); diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h index 4e56baa9c2da..1437a6dbdca5 100644 --- a/drivers/net/can/c_can/c_can.h +++ b/drivers/net/can/c_can/c_can.h @@ -153,6 +153,7 @@ struct c_can_priv { struct can_priv can; /* must be the first member */ struct napi_struct napi; struct net_device *dev; + struct device *device; int tx_object; int current_status; int last_status; diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c index d0a66cf298ba..7b8b7a485d72 100644 --- a/drivers/net/can/c_can/c_can_platform.c +++ b/drivers/net/can/c_can/c_can_platform.c @@ -179,6 +179,7 @@ static int __devinit c_can_plat_probe(struct platform_device *pdev) dev->irq = irq; priv->base = addr; + priv->device = &pdev->dev; priv->can.clock.freq = clk_get_rate(clk); priv->priv = clk;