Currently, the ep93xx_eth driver doesn't care about the PHY state,
but it should, in order to tell the MAC when full duplex operation is
required; failure to do so causes degraded performance on full duplex
links. This patch implements proper PHY handling via the phylib framework:
- clean up ep93xx_mdio_{read,write} to conform to ep93xx manual
- convert ep93xx_eth driver to phylib framework
- set full duplex bit in configuration of MAC when FDX link detected
- convert to use print_mac()
Signed-off-by: Herbert Valerio Riedel <[EMAIL PROTECTED]>
Cc: Lennert Buytenhek <[EMAIL PROTECTED]>
Cc: Andy Fleming <[EMAIL PROTECTED]>
---
If you need me to split this patch, please let me know into
what parts
drivers/net/arm/Kconfig | 1 +
drivers/net/arm/ep93xx_eth.c | 354 +++++++++++++++++++++++++++++++++---------
2 files changed, 282 insertions(+), 73 deletions(-)
diff --git a/drivers/net/arm/Kconfig b/drivers/net/arm/Kconfig
index f9cc2b6..5860175 100644
--- a/drivers/net/arm/Kconfig
+++ b/drivers/net/arm/Kconfig
@@ -44,6 +44,7 @@ config EP93XX_ETH
tristate "EP93xx Ethernet support"
depends on ARM && ARCH_EP93XX
select MII
+ select PHYLIB
help
This is a driver for the ethernet hardware included in EP93xx CPUs.
Say Y if you are building a kernel for EP93xx based devices.
diff --git a/drivers/net/arm/ep93xx_eth.c b/drivers/net/arm/ep93xx_eth.c
index 91a6590..6b9ac41 100644
--- a/drivers/net/arm/ep93xx_eth.c
+++ b/drivers/net/arm/ep93xx_eth.c
@@ -2,6 +2,7 @@
* EP93xx ethernet network device driver
* Copyright (C) 2006 Lennert Buytenhek <[EMAIL PROTECTED]>
* Dedicated to Marija Kulikova.
+ * Copyright (C) 2007 Herbert Valerio Riedel <[EMAIL PROTECTED]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -14,6 +15,7 @@
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/mii.h>
+#include <linux/phy.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/init.h>
@@ -37,6 +39,8 @@
#define REG_RXCTL_DEFAULT 0x00073800
#define REG_TXCTL 0x0004
#define REG_TXCTL_ENABLE 0x00000001
+#define REG_TESTCTL 0x0008
+#define REG_TESTCTL_MFDX 0x00000040
#define REG_MIICMD 0x0010
#define REG_MIICMD_READ 0x00008000
#define REG_MIICMD_WRITE 0x00004000
@@ -45,6 +49,9 @@
#define REG_MIISTS_BUSY 0x00000001
#define REG_SELFCTL 0x0020
#define REG_SELFCTL_RESET 0x00000001
+#define REG_SELFCTL_MDCDIV_MSK 0x00007e00
+#define REG_SELFCTL_MDCDIV_OFS 9
+#define REG_SELFCTL_PSPRS 0x00000100
#define REG_INTEN 0x0024
#define REG_INTEN_TX 0x00000008
#define REG_INTEN_RX 0x00000007
@@ -174,8 +181,14 @@ struct ep93xx_priv
struct net_device_stats stats;
- struct mii_if_info mii;
u8 mdc_divisor;
+ int phy_supports_mfps:1;
+
+ struct mii_bus mii_bus;
+ struct phy_device *phy_dev;
+ int speed;
+ int duplex;
+ int link;
};
#define rdb(ep, off) __raw_readb((ep)->base_addr + (off))
@@ -185,8 +198,6 @@ struct ep93xx_priv
#define wrw(ep, off, val) __raw_writew((val), (ep)->base_addr + (off))
#define wrl(ep, off, val) __raw_writel((val), (ep)->base_addr + (off))
-static int ep93xx_mdio_read(struct net_device *dev, int phy_id, int reg);
-
static struct net_device_stats *ep93xx_get_stats(struct net_device *dev)
{
struct ep93xx_priv *ep = netdev_priv(dev);
@@ -542,12 +553,6 @@ static int ep93xx_start_hw(struct net_device *dev)
return 1;
}
- wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9));
-
- /* Does the PHY support preamble suppress? */
- if ((ep93xx_mdio_read(dev, ep->mii.phy_id, MII_BMSR) & 0x0040) != 0)
- wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9) | (1 << 8));
-
/* Receive descriptor ring. */
addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rdesc);
wrl(ep, REG_RXDQBADD, addr);
@@ -631,12 +636,11 @@ static int ep93xx_open(struct net_device *dev)
return -ENOMEM;
if (is_zero_ether_addr(dev->dev_addr)) {
+ DECLARE_MAC_BUF(mac_buf);
+
random_ether_addr(dev->dev_addr);
- printk(KERN_INFO "%s: generated random MAC address "
- "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", dev->name,
- dev->dev_addr[0], dev->dev_addr[1],
- dev->dev_addr[2], dev->dev_addr[3],
- dev->dev_addr[4], dev->dev_addr[5]);
+ dev_info(&dev->dev, "generated random MAC address %s\n",
+ print_mac(mac_buf, dev->dev_addr));
}
napi_enable(&ep->napi);
@@ -664,6 +668,8 @@ static int ep93xx_open(struct net_device *dev)
wrl(ep, REG_GIINTMSK, REG_GIINTMSK_ENABLE);
+ phy_start(ep->phy_dev);
+
netif_start_queue(dev);
return 0;
@@ -676,6 +682,9 @@ static int ep93xx_close(struct net_device *dev)
napi_disable(&ep->napi);
netif_stop_queue(dev);
+ if (ep->phy_dev)
+ phy_stop(ep->phy_dev);
+
wrl(ep, REG_GIINTMSK, 0);
free_irq(ep->irq, dev);
ep93xx_stop_hw(dev);
@@ -687,53 +696,103 @@ static int ep93xx_close(struct net_device *dev)
static int ep93xx_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct ep93xx_priv *ep = netdev_priv(dev);
- struct mii_ioctl_data *data = if_mii(ifr);
- return generic_mii_ioctl(&ep->mii, data, cmd, NULL);
+ return phy_mii_ioctl(ep->phy_dev, if_mii(ifr), cmd);
}
-static int ep93xx_mdio_read(struct net_device *dev, int phy_id, int reg)
+/* common MII transactions should take < 100 iterations */
+#define EP93XX_PHY_TIMEOUT 2000
+
+static int ep93xx_mdio_wait(struct mii_bus *bus)
{
- struct ep93xx_priv *ep = netdev_priv(dev);
- int data;
- int i;
+ struct ep93xx_priv *ep = bus->priv;
+ unsigned int timeout = EP93XX_PHY_TIMEOUT;
- wrl(ep, REG_MIICMD, REG_MIICMD_READ | (phy_id << 5) | reg);
+ while ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY)
+ && timeout--)
+ cpu_relax();
- for (i = 0; i < 10; i++) {
- if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
- break;
- msleep(1);
+ if (timeout <= 0) {
+ dev_err(bus->dev, "MII operation timed out\n");
+ return -ETIMEDOUT;
}
- if (i == 10) {
- printk(KERN_INFO DRV_MODULE_NAME ": mdio read timed out\n");
- data = 0xffff;
- } else {
- data = rdl(ep, REG_MIIDATA);
- }
+ return 0;
+}
+
+
+static int ep93xx_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
+{
+ struct ep93xx_priv *ep = bus->priv;
+ u32 selfctl;
+ u32 data;
+
+ if (ep93xx_mdio_wait(bus) < 0)
+ return -ETIMEDOUT;
+
+ selfctl = rdl(ep, REG_SELFCTL);
+
+ if (ep->phy_supports_mfps)
+ wrl(ep, REG_SELFCTL, selfctl | REG_SELFCTL_PSPRS);
+ else
+ wrl(ep, REG_SELFCTL, selfctl & ~REG_SELFCTL_PSPRS);
+
+ wrl(ep, REG_MIICMD, REG_MIICMD_READ | (mii_id << 5) | regnum);
+
+ if (ep93xx_mdio_wait(bus) < 0)
+ return -ETIMEDOUT;
+
+ data = rdl(ep, REG_MIIDATA);
+
+ wrl(ep, REG_SELFCTL, selfctl);
return data;
}
-static void ep93xx_mdio_write(struct net_device *dev, int phy_id, int reg, int
data)
+static int ep93xx_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
+ u16 value)
{
- struct ep93xx_priv *ep = netdev_priv(dev);
- int i;
+ struct ep93xx_priv *ep = bus->priv;
+ u32 selfctl;
- wrl(ep, REG_MIIDATA, data);
- wrl(ep, REG_MIICMD, REG_MIICMD_WRITE | (phy_id << 5) | reg);
+ if (ep93xx_mdio_wait(bus) < 0)
+ return -ETIMEDOUT;
- for (i = 0; i < 10; i++) {
- if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
- break;
- msleep(1);
- }
+ selfctl = rdl(ep, REG_SELFCTL);
- if (i == 10)
- printk(KERN_INFO DRV_MODULE_NAME ": mdio write timed out\n");
+ if (ep->phy_supports_mfps)
+ wrl(ep, REG_SELFCTL, selfctl | REG_SELFCTL_PSPRS);
+ else
+ wrl(ep, REG_SELFCTL, selfctl & ~REG_SELFCTL_PSPRS);
+
+ wrl(ep, REG_MIIDATA, value);
+ wrl(ep, REG_MIICMD, REG_MIICMD_WRITE | (mii_id << 5) | regnum);
+
+ if (ep93xx_mdio_wait(bus) < 0)
+ return -ETIMEDOUT;
+
+ wrl(ep, REG_SELFCTL, selfctl);
+
+ return 0;
+}
+
+static int ep93xx_mdio_reset(struct mii_bus *bus)
+{
+ struct ep93xx_priv *ep = bus->priv;
+
+ u32 selfctl = rdl(ep, REG_SELFCTL);
+
+ selfctl &= ~(REG_SELFCTL_MDCDIV_MSK | REG_SELFCTL_PSPRS);
+
+ selfctl |= (ep->mdc_divisor - 1) << REG_SELFCTL_MDCDIV_OFS;
+ selfctl |= REG_SELFCTL_PSPRS;
+
+ wrl(ep, REG_SELFCTL, selfctl);
+
+ return 0;
}
+
static void ep93xx_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo
*info)
{
strcpy(info->driver, DRV_MODULE_NAME);
@@ -743,33 +802,30 @@ static void ep93xx_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *i
static int ep93xx_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct ep93xx_priv *ep = netdev_priv(dev);
- return mii_ethtool_gset(&ep->mii, cmd);
+ struct phy_device *phydev = ep->phy_dev;
+
+ if (!phydev)
+ return -ENODEV;
+
+ return phy_ethtool_gset(phydev, cmd);
}
static int ep93xx_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct ep93xx_priv *ep = netdev_priv(dev);
- return mii_ethtool_sset(&ep->mii, cmd);
-}
+ struct phy_device *phydev = ep->phy_dev;
-static int ep93xx_nway_reset(struct net_device *dev)
-{
- struct ep93xx_priv *ep = netdev_priv(dev);
- return mii_nway_restart(&ep->mii);
-}
+ if (!phydev)
+ return -ENODEV;
-static u32 ep93xx_get_link(struct net_device *dev)
-{
- struct ep93xx_priv *ep = netdev_priv(dev);
- return mii_link_ok(&ep->mii);
+ return phy_ethtool_sset(phydev, cmd);
}
static struct ethtool_ops ep93xx_ethtool_ops = {
.get_drvinfo = ep93xx_get_drvinfo,
.get_settings = ep93xx_get_settings,
.set_settings = ep93xx_set_settings,
- .nway_reset = ep93xx_nway_reset,
- .get_link = ep93xx_get_link,
+ .get_link = ethtool_op_get_link,
};
struct net_device *ep93xx_dev_alloc(struct ep93xx_eth_data *data)
@@ -824,15 +880,127 @@ static int ep93xx_eth_remove(struct platform_device
*pdev)
return 0;
}
+static void ep93xx_adjust_link(struct net_device *dev)
+{
+ struct ep93xx_priv *ep = netdev_priv(dev);
+ struct phy_device *phydev = ep->phy_dev;
+
+ int status_change = 0;
+
+ if (phydev->link) {
+ if ((ep->speed != phydev->speed) ||
+ (ep->duplex != phydev->duplex)) {
+ /* speed and/or duplex state changed */
+ u32 testctl = rdl(ep, REG_TESTCTL);
+
+ if (DUPLEX_FULL == phydev->duplex)
+ testctl |= REG_TESTCTL_MFDX;
+ else
+ testctl &= ~(REG_TESTCTL_MFDX);
+
+ wrl(ep, REG_TESTCTL, testctl);
+
+ ep->speed = phydev->speed;
+ ep->duplex = phydev->duplex;
+ status_change = 1;
+ }
+ }
+
+ /* test for online/offline link transition */
+ if (phydev->link != ep->link) {
+ if (phydev->link) /* link went online */
+ netif_schedule(dev);
+ else { /* link went offline */
+ ep->speed = 0;
+ ep->duplex = -1;
+ }
+ ep->link = phydev->link;
+
+ status_change = 1;
+ }
+
+ if (status_change)
+ phy_print_status(phydev);
+}
+
+static int ep93xx_mii_probe(struct net_device *dev, int phy_addr)
+{
+ struct ep93xx_priv *ep = netdev_priv(dev);
+ struct phy_device *phydev = NULL;
+ int val;
+
+ if (phy_addr >= 0 && phy_addr < PHY_MAX_ADDR)
+ phydev = ep->mii_bus.phy_map[phy_addr];
+
+ if (!phydev) {
+ dev_info(&dev->dev,
+ "PHY not found at specified address,"
+ " trying autodetection\n");
+
+ /* find the first phy */
+ for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
+ if (ep->mii_bus.phy_map[phy_addr]) {
+ phydev = ep->mii_bus.phy_map[phy_addr];
+ break;
+ }
+ }
+ }
+
+ if (!phydev) {
+ dev_err(&dev->dev, "no PHY found\n");
+ return -ENODEV;
+ }
+
+ phydev = phy_connect(dev, phydev->dev.bus_id,
+ ep93xx_adjust_link, 0, PHY_INTERFACE_MODE_MII);
+
+ if (IS_ERR(phydev)) {
+ dev_err(&dev->dev, "Could not attach to PHY\n");
+ return PTR_ERR(phydev);
+ }
+
+ ep->phy_supports_mfps = 0;
+
+ val = phy_read(phydev, MII_BMSR);
+ if (val < 0) {
+ dev_err(&phydev->dev, "failed to read MII register\n");
+ return val;
+ }
+
+ if (val & 0x0040) {
+ dev_info(&phydev->dev,
+ "PHY supports MII frame preamble suppression\n");
+ ep->phy_supports_mfps = 1;
+ }
+
+ phydev->supported &= PHY_BASIC_FEATURES;
+
+ phydev->advertising = phydev->supported;
+
+ ep->link = 0;
+ ep->speed = 0;
+ ep->duplex = -1;
+ ep->phy_dev = phydev;
+
+ dev_info(&dev->dev, "attached PHY driver [%s] "
+ "(mii_bus:phy_addr=%s, irq=%d)\n",
+ phydev->drv->name, phydev->dev.bus_id, phydev->irq);
+
+ return 0;
+}
+
+
static int ep93xx_eth_probe(struct platform_device *pdev)
{
struct ep93xx_eth_data *data;
struct net_device *dev;
struct ep93xx_priv *ep;
- int err;
+ DECLARE_MAC_BUF(mac_buf);
+ int err, i;
if (pdev == NULL)
return -ENODEV;
+
data = pdev->dev.platform_data;
dev = ep93xx_dev_alloc(data);
@@ -852,7 +1020,7 @@ static int ep93xx_eth_probe(struct platform_device *pdev)
if (ep->res == NULL) {
dev_err(&pdev->dev, "Could not reserve memory region\n");
err = -ENOMEM;
- goto err_out;
+ goto err_out_request_mem_region;
}
ep->base_addr = ioremap(pdev->resource[0].start,
@@ -860,34 +1028,74 @@ static int ep93xx_eth_probe(struct platform_device *pdev)
if (ep->base_addr == NULL) {
dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
err = -EIO;
- goto err_out;
+ goto err_out_ioremap;
}
ep->irq = pdev->resource[1].start;
- ep->mii.phy_id = data->phy_id;
- ep->mii.phy_id_mask = 0x1f;
- ep->mii.reg_num_mask = 0x1f;
- ep->mii.dev = dev;
- ep->mii.mdio_read = ep93xx_mdio_read;
- ep->mii.mdio_write = ep93xx_mdio_write;
+ /* mdio/mii bus */
+ ep->mii_bus.name = "ep93xx_mii_bus";
+ ep->mii_bus.id = 0;
+
+ ep->mii_bus.read = ep93xx_mdio_read;
+ ep->mii_bus.write = ep93xx_mdio_write;
+ ep->mii_bus.reset = ep93xx_mdio_reset;
+
+ ep->mii_bus.phy_mask = 0;
+
+ ep->mii_bus.priv = ep;
+ ep->mii_bus.dev = &dev->dev;
+
+ ep->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
+ if (NULL == ep->mii_bus.irq) {
+ dev_err(&pdev->dev, "Could not allocate memory\n");
+ err = -ENOMEM;
+ goto err_out_mii_bus_irq_kmalloc;
+ }
+
+ for (i = 0; i < PHY_MAX_ADDR; i++)
+ ep->mii_bus.irq[i] = PHY_POLL;
+
ep->mdc_divisor = 40; /* Max HCLK 100 MHz, min MDIO clk 2.5 MHz. */
+ ep->phy_supports_mfps = 0; /* probe without preamble suppression */
err = register_netdev(dev);
if (err) {
dev_err(&pdev->dev, "Failed to register netdev\n");
- goto err_out;
+ goto err_out_register_netdev;
}
- printk(KERN_INFO "%s: ep93xx on-chip ethernet, IRQ %d, "
- "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", dev->name,
- ep->irq, data->dev_addr[0], data->dev_addr[1],
- data->dev_addr[2], data->dev_addr[3],
- data->dev_addr[4], data->dev_addr[5]);
+ err = mdiobus_register(&ep->mii_bus);
+ if (err) {
+ dev_err(&dev->dev, "Could not register MII bus\n");
+ goto err_out_mdiobus_register;
+ }
+
+ err = ep93xx_mii_probe(dev, data->phy_id);
+ if (err) {
+ dev_err(&dev->dev, "failed to probe MII bus\n");
+ goto err_out_mii_probe;
+ }
+
+ dev_info(&dev->dev, "ep93xx on-chip ethernet, IRQ %d, %s\n",
+ ep->irq, print_mac(mac_buf, dev->dev_addr));
return 0;
+err_out_mii_probe:
+ mdiobus_unregister(&ep->mii_bus);
+err_out_mdiobus_register:
+ unregister_netdev(dev);
+err_out_register_netdev:
+ kfree(ep->mii_bus.irq);
+err_out_mii_bus_irq_kmalloc:
+ iounmap(ep->base_addr);
+err_out_ioremap:
+ release_resource(ep->res);
+ kfree(ep->res);
+err_out_request_mem_region:
+ free_netdev(dev);
err_out:
- ep93xx_eth_remove(pdev);
+
return err;
}
--
1.5.3.4
-
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