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net: bcmgenet: add suspend/resume callbacks 

Implement suspend/resume callbacks in the GENET driver. This makes sure
that we de-initialize and re-initialize the hardware correctly before
entering suspend and when resuming.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Florian Fainelli 2014-07-21 15:29:22 -07:00 committed by David S. Miller
parent 909ff5efba
commit b6e978e504
1 changed files with 95 additions and 0 deletions
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95
drivers/net/ethernet/broadcom/genet/bcmgenet.c
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@ -2584,6 +2584,100 @@ static int bcmgenet_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int bcmgenet_suspend(struct device *d)
{
struct net_device *dev = dev_get_drvdata(d);
struct bcmgenet_priv *priv = netdev_priv(dev);
int ret;
if (!netif_running(dev))
return 0;
bcmgenet_netif_stop(dev);
netif_device_detach(dev);
/* Disable MAC receive */
umac_enable_set(priv, CMD_RX_EN, false);
ret = bcmgenet_dma_teardown(priv);
if (ret)
return ret;
/* Disable MAC transmit. TX DMA disabled have to done before this */
umac_enable_set(priv, CMD_TX_EN, false);
/* tx reclaim */
bcmgenet_tx_reclaim_all(dev);
bcmgenet_fini_dma(priv);
/* Turn off the clocks */
clk_disable_unprepare(priv->clk);
return 0;
}
static int bcmgenet_resume(struct device *d)
{
struct net_device *dev = dev_get_drvdata(d);
struct bcmgenet_priv *priv = netdev_priv(dev);
unsigned long dma_ctrl;
int ret;
u32 reg;
if (!netif_running(dev))
return 0;
/* Turn on the clock */
ret = clk_prepare_enable(priv->clk);
if (ret)
return ret;
bcmgenet_umac_reset(priv);
ret = init_umac(priv);
if (ret)
goto out_clk_disable;
/* disable ethernet MAC while updating its registers */
umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, false);
bcmgenet_set_hw_addr(priv, dev->dev_addr);
if (phy_is_internal(priv->phydev)) {
reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
reg |= EXT_ENERGY_DET_MASK;
bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
}
/* Disable RX/TX DMA and flush TX queues */
dma_ctrl = bcmgenet_dma_disable(priv);
/* Reinitialize TDMA and RDMA and SW housekeeping */
ret = bcmgenet_init_dma(priv);
if (ret) {
netdev_err(dev, "failed to initialize DMA\n");
goto out_clk_disable;
}
/* Always enable ring 16 - descriptor ring */
bcmgenet_enable_dma(priv, dma_ctrl);
netif_device_attach(dev);
bcmgenet_netif_start(dev);
return 0;
out_clk_disable:
clk_disable_unprepare(priv->clk);
return ret;
}
#endif /* CONFIG_PM_SLEEP */
static SIMPLE_DEV_PM_OPS(bcmgenet_pm_ops, bcmgenet_suspend, bcmgenet_resume);
static struct platform_driver bcmgenet_driver = {
.probe = bcmgenet_probe,
.remove = bcmgenet_remove,
@ -2591,6 +2685,7 @@ static struct platform_driver bcmgenet_driver = {
.name = "bcmgenet",
.owner = THIS_MODULE,
.of_match_table = bcmgenet_match,
.pm = &bcmgenet_pm_ops,
},
};
module_platform_driver(bcmgenet_driver);