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Message-Id: <1405981769-24618-5-git-send-email-f.fainelli@gmail.com>
Date: Mon, 21 Jul 2014 15:29:22 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net-next v2 04/11] 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@...il.com>
---
Changes in v2:
- update callers of umac_enable_set to use true/false
drivers/net/ethernet/broadcom/genet/bcmgenet.c | 95 ++++++++++++++++++++++++++
1 file changed, 95 insertions(+)
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 5cab188ee323..bbd8bf326a35 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -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);
--
1.9.1
--
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