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Message-Id: <1268317491-3822-2-git-send-email-srk@ti.com>
Date: Thu, 11 Mar 2010 19:54:50 +0530
From: Sriramakrishnan <srk@...com>
To: netdev@...r.kernel.org,
davinci-linux-open-source@...ux.davincidsp.com
Cc: nsekhar@...com, Sriramakrishnan <srk@...com>
Subject: [PATCH 1/2] TI DaVinci EMAC: Add EMAC PHY clock handling.
Source for the EMAC PHY clock can be different from the
module clock and driver needs to request/enable the EMAC
phy clock explicitly. This was not required earlier as on
most Davinci platforms the phy clock is always on . On AM35x
platform the phy clock needs to be managed explicitly , hence
adding clock management for phy clock.
Signed-off-by: Sriramakrishnan <srk@...com>
---
drivers/net/davinci_emac.c | 22 ++++++++++++++++++++--
1 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
index 8a42dbe..d9ae6ee 100644
--- a/drivers/net/davinci_emac.c
+++ b/drivers/net/davinci_emac.c
@@ -491,6 +491,7 @@ struct emac_priv {
/* clock frequency for EMAC */
static struct clk *emac_clk;
+static struct clk *emac_phy_clk;
static unsigned long emac_bus_frequency;
static unsigned long mdio_max_freq;
@@ -2637,18 +2638,28 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev)
struct emac_platform_data *pdata;
struct device *emac_dev;
- /* obtain emac clock from kernel */
- emac_clk = clk_get(&pdev->dev, NULL);
+ /* obtain emac module clock from kernel */
+ emac_clk = clk_get(&pdev->dev, "emac_clk");
if (IS_ERR(emac_clk)) {
printk(KERN_ERR "DaVinci EMAC: Failed to get EMAC clock\n");
return -EBUSY;
}
+
+ /* obtain emac phy clock from kernel */
+ emac_phy_clk = clk_get(&pdev->dev, "phy_clk");
+ if (IS_ERR(emac_phy_clk)) {
+ printk(KERN_ERR "DaVinci EMAC: Failed to get PHY clock\n");
+ clk_put(emac_clk);
+ return -EBUSY;
+ }
+
emac_bus_frequency = clk_get_rate(emac_clk);
/* TODO: Probe PHY here if possible */
ndev = alloc_etherdev(sizeof(struct emac_priv));
if (!ndev) {
printk(KERN_ERR "DaVinci EMAC: Error allocating net_device\n");
+ clk_put(emac_phy_clk);
clk_put(emac_clk);
return -ENOMEM;
}
@@ -2734,6 +2745,7 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev)
netif_napi_add(ndev, &priv->napi, emac_poll, EMAC_POLL_WEIGHT);
clk_enable(emac_clk);
+ clk_enable(emac_phy_clk);
/* register the network device */
SET_NETDEV_DEV(ndev, &pdev->dev);
@@ -2783,6 +2795,7 @@ mdiobus_quit:
netdev_reg_err:
mdio_alloc_err:
+ clk_disable(emac_phy_clk);
clk_disable(emac_clk);
no_irq_res:
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -2790,6 +2803,7 @@ no_irq_res:
iounmap(priv->remap_addr);
probe_quit:
+ clk_put(emac_phy_clk);
clk_put(emac_clk);
free_netdev(ndev);
return rc;
@@ -2821,7 +2835,9 @@ static int __devexit davinci_emac_remove(struct platform_device *pdev)
free_netdev(ndev);
iounmap(priv->remap_addr);
+ clk_disable(emac_phy_clk);
clk_disable(emac_clk);
+ clk_put(emac_phy_clk);
clk_put(emac_clk);
return 0;
@@ -2835,6 +2851,7 @@ static int davinci_emac_suspend(struct device *dev)
if (netif_running(ndev))
emac_dev_stop(ndev);
+ clk_disable(emac_phy_clk);
clk_disable(emac_clk);
return 0;
@@ -2846,6 +2863,7 @@ static int davinci_emac_resume(struct device *dev)
struct net_device *ndev = platform_get_drvdata(pdev);
clk_enable(emac_clk);
+ clk_enable(emac_phy_clk);
if (netif_running(ndev))
emac_dev_open(ndev);
--
1.6.2.4
--
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