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Subject[PATCH 2/8] [Blackfin] EMAC driver: define MDC_CLK=2.5MHz and caculate mdc_div according to SCLK.
Date
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
---
drivers/net/bfin_mac.c | 16 ++++++++++++----
1 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index 4006a5d..ee39819 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c
@@ -412,20 +412,26 @@ static void bf537_adjust_link(struct net_device *dev)
spin_unlock_irqrestore(&lp->lock, flags);
}

+/* MDC = 2.5 MHz */
+#define MDC_CLK 2500000
+
static int mii_probe(struct net_device *dev)
{
struct bf537mac_local *lp = netdev_priv(dev);
struct phy_device *phydev = NULL;
unsigned short sysctl;
int i;
+ u32 sclk, mdc_div;

/* Enable PHY output early */
if (!(bfin_read_VR_CTL() & PHYCLKOE))
bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);

- /* MDC = 2.5 MHz */
+ sclk = get_sclk();
+ mdc_div = ((sclk / MDC_CLK) / 2) - 1;
+
sysctl = bfin_read_EMAC_SYSCTL();
- sysctl |= SET_MDCDIV(24);
+ sysctl |= SET_MDCDIV(mdc_div);
bfin_write_EMAC_SYSCTL(sysctl);

/* search for connect PHY device */
@@ -477,8 +483,10 @@ static int mii_probe(struct net_device *dev)
lp->phydev = phydev;

printk(KERN_INFO "%s: attached PHY driver [%s] "
- "(mii_bus:phy_addr=%s, irq=%d)\n",
- DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq);
+ "(mii_bus:phy_addr=%s, irq=%d, mdc_clk=%dHz(mdc_div=%d)"
+ "@sclk=%dMHz)\n",
+ DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq,
+ MDC_CLK, mdc_div, sclk/1000000);

return 0;
}
--
1.5.3.4

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