FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2024-12-23 09:56:00 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

can: c_can: Add runtime PM support to Bosch C_CAN/D_CAN controller

Browse Source 
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 <anilkumar@ti.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
AnilKumar Ch 2012-08-20 16:50:54 +05:30 committed by Marc Kleine-Budde
parent 2469627d17
commit 4cdd34b268
3 changed files with 49 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
drivers/net/can/c_can/c_can.c
View File

@ -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>
@ -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);

1
drivers/net/can/c_can/c_can.h
View File

@ -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;

1
drivers/net/can/c_can/c_can_platform.c
View File

@ -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;