From 3ba97381343b271296487bf073eb670d5465a8b8 Mon Sep 17 00:00:00 2001 From: "Mark A. Greer" Date: Fri, 20 Jul 2012 15:19:22 +0000 Subject: [PATCH] net: ethernet: davinci_emac: add pm_runtime support Add pm_runtime support to the TI Davinci EMAC driver. CC: Sekhar Nori CC: Kevin Hilman Signed-off-by: Mark A. Greer Signed-off-by: David S. Miller --- drivers/net/ethernet/ti/davinci_emac.c | 43 +++++++++++++------------- 1 file changed, 22 insertions(+), 21 deletions(-) diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c index 1a9c43f27552..fce89a0ab06e 100644 --- a/drivers/net/ethernet/ti/davinci_emac.c +++ b/drivers/net/ethernet/ti/davinci_emac.c @@ -57,6 +57,7 @@ #include #include #include +#include #include #include #include @@ -353,10 +354,6 @@ struct emac_priv { void (*int_disable) (void); }; -/* clock frequency for EMAC */ -static struct clk *emac_clk; -static unsigned long emac_bus_frequency; - /* EMAC TX Host Error description strings */ static char *emac_txhost_errcodes[16] = { "No error", "SOP error", "Ownership bit not set in SOP buffer", @@ -1540,6 +1537,8 @@ static int emac_dev_open(struct net_device *ndev) int k = 0; struct emac_priv *priv = netdev_priv(ndev); + pm_runtime_get(&priv->pdev->dev); + netif_carrier_off(ndev); for (cnt = 0; cnt < ETH_ALEN; cnt++) ndev->dev_addr[cnt] = priv->mac_addr[cnt]; @@ -1609,7 +1608,7 @@ static int emac_dev_open(struct net_device *ndev) priv->phy_id); ret = PTR_ERR(priv->phydev); priv->phydev = NULL; - return ret; + goto err; } priv->link = 0; @@ -1650,7 +1649,11 @@ rollback: res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, k-1); m = res->end; } - return -EBUSY; + + ret = -EBUSY; +err: + pm_runtime_put(&priv->pdev->dev); + return ret; } /** @@ -1692,6 +1695,7 @@ static int emac_dev_stop(struct net_device *ndev) if (netif_msg_drv(priv)) dev_notice(emac_dev, "DaVinci EMAC: %s stopped\n", ndev->name); + pm_runtime_put(&priv->pdev->dev); return 0; } @@ -1856,6 +1860,9 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev) struct emac_platform_data *pdata; struct device *emac_dev; struct cpdma_params dma_params; + struct clk *emac_clk; + unsigned long emac_bus_frequency; + /* obtain emac clock from kernel */ emac_clk = clk_get(&pdev->dev, NULL); @@ -1864,12 +1871,14 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev) return -EBUSY; } emac_bus_frequency = clk_get_rate(emac_clk); + clk_put(emac_clk); + /* TODO: Probe PHY here if possible */ ndev = alloc_etherdev(sizeof(struct emac_priv)); if (!ndev) { rc = -ENOMEM; - goto free_clk; + goto no_ndev; } platform_set_drvdata(pdev, ndev); @@ -1985,15 +1994,13 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev) SET_ETHTOOL_OPS(ndev, ðtool_ops); netif_napi_add(ndev, &priv->napi, emac_poll, EMAC_POLL_WEIGHT); - clk_enable(emac_clk); - /* register the network device */ SET_NETDEV_DEV(ndev, &pdev->dev); rc = register_netdev(ndev); if (rc) { dev_err(&pdev->dev, "error in register_netdev\n"); rc = -ENODEV; - goto netdev_reg_err; + goto no_irq_res; } @@ -2002,10 +2009,12 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev) "(regs: %p, irq: %d)\n", (void *)priv->emac_base_phys, ndev->irq); } + + pm_runtime_enable(&pdev->dev); + pm_runtime_resume(&pdev->dev); + return 0; -netdev_reg_err: - clk_disable(emac_clk); no_irq_res: if (priv->txchan) cpdma_chan_destroy(priv->txchan); @@ -2019,8 +2028,7 @@ no_dma: probe_quit: free_netdev(ndev); -free_clk: - clk_put(emac_clk); +no_ndev: return rc; } @@ -2054,9 +2062,6 @@ static int __devexit davinci_emac_remove(struct platform_device *pdev) iounmap(priv->remap_addr); free_netdev(ndev); - clk_disable(emac_clk); - clk_put(emac_clk); - return 0; } @@ -2068,8 +2073,6 @@ static int davinci_emac_suspend(struct device *dev) if (netif_running(ndev)) emac_dev_stop(ndev); - clk_disable(emac_clk); - return 0; } @@ -2078,8 +2081,6 @@ static int davinci_emac_resume(struct device *dev) struct platform_device *pdev = to_platform_device(dev); struct net_device *ndev = platform_get_drvdata(pdev); - clk_enable(emac_clk); - if (netif_running(ndev)) emac_dev_open(ndev); -- 2.30.2