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Date: Thu, 26 Apr 2012 21:55:17 +0200
From: Stephane Fillod <fillods@...rs.sf.net>
To: netdev@...r.kernel.org
Cc: steve.glendinning@...well.net
Subject: [PATCH] net: smsc75xx: fix MDIO access
* make MDIO read/write to work, the MII_ACCESS_BUSY bit was missing
to actually trigger the I/O. Rem: the smsc75xx is different from
the smsc95xx in that regard.
* fix PHY interrupt acknowledge, which needs a mdio_write
to clear PHY_INT_SRC instead of a usual read like in smsc95xx.
* fix bug in phy_init loop that was ignoring BMCR reset bit,
akin to smsc95xx's d946092000698fd204d82a9d239103c656fb63bf
* mark link down on startup and let PHY interrupt deal with carrier
changes, akin to 07d69d4238418746a7b85c5d05ec17c658a2a390
* declare the smsc75xx's MII as GMII capable
Tested on ARM/Omap3 with LAN7500-CEB.
Signed-off-by: Stephane Fillod <fillods@...rs.sf.net>
Cc: Steve Glendinning <steve.glendinning@...well.net>
---
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -32,7 +32,7 @@
#include "smsc75xx.h"
#define SMSC_CHIPNAME "smsc75xx"
-#define SMSC_DRIVER_VERSION "1.0.0"
+#define SMSC_DRIVER_VERSION "1.1.0"
#define HS_USB_PKT_SIZE (512)
#define FS_USB_PKT_SIZE (64)
#define DEFAULT_HS_BURST_CAP_SIZE (16 * 1024 + 5 * HS_USB_PKT_SIZE)
@@ -98,7 +98,7 @@ static int __must_check smsc75xx_read_re
if (unlikely(ret < 0))
netdev_warn(dev->net,
- "Failed to read register index 0x%08x", index);
+ "Failed to read register index 0x%08x: %d", index, ret);
le32_to_cpus(buf);
*data = *buf;
@@ -128,7 +128,7 @@ static int __must_check smsc75xx_write_r
if (unlikely(ret < 0))
netdev_warn(dev->net,
- "Failed to write register index 0x%08x", index);
+ "Failed to write register index 0x%08x: %d", index, ret);
kfree(buf);
@@ -171,7 +171,7 @@ static int smsc75xx_mdio_read(struct net
idx &= dev->mii.reg_num_mask;
addr = ((phy_id << MII_ACCESS_PHY_ADDR_SHIFT) & MII_ACCESS_PHY_ADDR)
| ((idx << MII_ACCESS_REG_ADDR_SHIFT) & MII_ACCESS_REG_ADDR)
- | MII_ACCESS_READ;
+ | MII_ACCESS_READ | MII_ACCESS_BUSY;
ret = smsc75xx_write_reg(dev, MII_ACCESS, addr);
check_warn_goto_done(ret, "Error writing MII_ACCESS");
@@ -185,6 +185,8 @@ static int smsc75xx_mdio_read(struct net
done:
mutex_unlock(&dev->phy_mutex);
+ netif_dbg(dev, drv, dev->net, "%s: id %x, idx %d, val=%04x",
+ __func__, phy_id, idx, ret);
return ret;
}
@@ -195,6 +197,9 @@ static void smsc75xx_mdio_write(struct n
u32 val, addr;
int ret;
+ netif_dbg(dev, drv, dev->net, "%s: id %x, idx %d, val=%04x",
+ __func__, phy_id, idx, regval);
+
mutex_lock(&dev->phy_mutex);
/* confirm MII not busy */
@@ -210,7 +215,7 @@ static void smsc75xx_mdio_write(struct n
idx &= dev->mii.reg_num_mask;
addr = ((phy_id << MII_ACCESS_PHY_ADDR_SHIFT) & MII_ACCESS_PHY_ADDR)
| ((idx << MII_ACCESS_REG_ADDR_SHIFT) & MII_ACCESS_REG_ADDR)
- | MII_ACCESS_WRITE;
+ | MII_ACCESS_WRITE | MII_ACCESS_BUSY;
ret = smsc75xx_write_reg(dev, MII_ACCESS, addr);
check_warn_goto_done(ret, "Error writing MII_ACCESS");
@@ -511,7 +516,11 @@ static int smsc75xx_link_reset(struct us
/* clear interrupt status */
ret = smsc75xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
check_warn_return(ret, "Error reading PHY_INT_SRC");
+ smsc75xx_mdio_write(dev->net, mii->phy_id, PHY_INT_SRC, 0xffff);
+ if (!ret)
+ netif_dbg(dev, link, dev->net, "%s: spurious interrupt", __func__);
+
ret = smsc75xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL);
check_warn_return(ret, "Error writing INT_STS");
@@ -643,7 +643,8 @@ static int smsc75xx_phy_initialize(struc
static int smsc75xx_phy_initialize(struct usbnet *dev)
{
- int bmcr, timeout = 0;
+ int bmcr, ret, timeout = 0;
+ u32 buf;
/* Initialize MII structure */
dev->mii.dev = dev->net;
@@ -651,17 +662,19 @@ static int smsc75xx_phy_initialize(struc
dev->mii.mdio_write = smsc75xx_mdio_write;
dev->mii.phy_id_mask = 0x1f;
dev->mii.reg_num_mask = 0x1f;
+ dev->mii.supports_gmii = 1;
dev->mii.phy_id = SMSC75XX_INTERNAL_PHY_ID;
/* reset phy and wait for reset to complete */
- smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
+ smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR,
+ BMCR_RESET | BMCR_ANENABLE);
do {
msleep(10);
bmcr = smsc75xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
check_warn_return(bmcr, "Error reading MII_BMCR");
timeout++;
- } while ((bmcr & MII_BMCR) && (timeout < 100));
+ } while ((bmcr & BMCR_RESET) && (timeout < 100));
if (timeout >= 100) {
netdev_warn(dev->net, "timeout on PHY Reset");
@@ -671,10 +684,17 @@ static int smsc75xx_phy_initialize(struc
smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
ADVERTISE_PAUSE_ASYM);
+ smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_CTRL1000,
+ ADVERTISE_1000FULL);
+ /* write to clear */
+ smsc75xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_SRC, 0xffff);
+ ret = smsc75xx_read_reg(dev, MAC_CR, &buf);
+ check_warn_return(ret, "Failed to read MAC_CR: %d", ret);
+
+ buf |= (MAC_CR_ADD | MAC_CR_ASD);
+ ret = smsc75xx_write_reg(dev, MAC_CR, buf);
+ check_warn_return(ret, "Failed to write MAC_CR: %d", ret);
- /* read to clear */
- smsc75xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
- check_warn_return(bmcr, "Error reading PHY_INT_SRC");
smsc75xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
PHY_INT_MASK_DEFAULT);
@@ -1211,7 +1211,7 @@ static const struct driver_info smsc75xx
.rx_fixup = smsc75xx_rx_fixup,
.tx_fixup = smsc75xx_tx_fixup,
.status = smsc75xx_status,
- .flags = FLAG_ETHER | FLAG_SEND_ZLP,
+ .flags = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
};
static const struct usb_device_id products[] = {
--
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