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net: smsc911x: add power management functions 

This adds a power management implementation for smsc911x.c which assumes
the chips remains powered during suspend. The device is put in its D1
power saving mode.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Acked-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Mack 2009-05-05 12:22:53 -07:00 committed by David S. Miller
parent c7ae011dc8
commit b6907b0c70
1 changed files with 46 additions and 0 deletions
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46
drivers/net/smsc911x.c
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@ -2109,12 +2109,58 @@ out_0:
return retval;
}
#ifdef CONFIG_PM
/* This implementation assumes the devices remains powered on its VDDVARIO
* pins during suspend. */
static int smsc911x_suspend(struct platform_device *pdev, pm_message_t state)
{
struct net_device *dev = platform_get_drvdata(pdev);
struct smsc911x_data *pdata = netdev_priv(dev);
/* enable wake on LAN, energy detection and the external PME
* signal. */
smsc911x_reg_write(pdata, PMT_CTRL,
PMT_CTRL_PM_MODE_D1_ | PMT_CTRL_WOL_EN_ |
PMT_CTRL_ED_EN_ | PMT_CTRL_PME_EN_);
return 0;
}
static int smsc911x_resume(struct platform_device *pdev)
{
struct net_device *dev = platform_get_drvdata(pdev);
struct smsc911x_data *pdata = netdev_priv(dev);
unsigned int to = 100;
/* Note 3.11 from the datasheet:
* "When the LAN9220 is in a power saving state, a write of any
* data to the BYTE_TEST register will wake-up the device."
*/
smsc911x_reg_write(pdata, BYTE_TEST, 0);
/* poll the READY bit in PMT_CTRL. Any other access to the device is
* forbidden while this bit isn't set. Try for 100ms and return -EIO
* if it failed. */
while (!(smsc911x_reg_read(pdata, PMT_CTRL) & PMT_CTRL_READY_) && --to)
udelay(1000);
return (to == 0) ? -EIO : 0;
}
#else
#define smsc911x_suspend NULL
#define smsc911x_resume NULL
#endif
static struct platform_driver smsc911x_driver = {
.probe = smsc911x_drv_probe,
.remove = smsc911x_drv_remove,
.driver = {
.name = SMSC_CHIPNAME,
},
.suspend = smsc911x_suspend,
.resume = smsc911x_resume,
};
/* Entry point for loading the module */