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smsc911x: add external phy detection overrides 

On LAN9115/LAN9117/LAN9215/LAN9217, external phys are supported.  These
are usually indicated by a hardware strap which sets an "external PHY
detected" bit in the HW_CFG register.

In some cases it is desirable to override this hardware strap and force
use of either the internal phy or an external PHY.  This patch adds
SMSC911X_FORCE_INTERNAL_PHY and SMSC911X_FORCE_EXTERNAL_PHY flags so a
platform can indicate this preference via its platform_data.

Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steve Glendinning 2009-01-27 06:51:11 +00:00 committed by David S. Miller
parent e81259b4f7
commit d23f028a4d
2 changed files with 40 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
drivers/net/smsc911x.c
View File

@ -368,48 +368,53 @@ out:
return reg;
}
/* Autodetects and initialises external phy for SMSC9115 and SMSC9117 flavors.
* If something goes wrong, returns -ENODEV to revert back to internal phy.
* Performed at initialisation only, so interrupts are enabled */
static int smsc911x_phy_initialise_external(struct smsc911x_data *pdata)
/* Switch to external phy. Assumes tx and rx are stopped. */
static void smsc911x_phy_enable_external(struct smsc911x_data *pdata)
{
unsigned int hwcfg = smsc911x_reg_read(pdata, HW_CFG);
/* External phy is requested, supported, and detected */
if (hwcfg & HW_CFG_EXT_PHY_DET_) {
/* Disable phy clocks to the MAC */
hwcfg &= (~HW_CFG_PHY_CLK_SEL_);
hwcfg |= HW_CFG_PHY_CLK_SEL_CLK_DIS_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);
udelay(10); /* Enough time for clocks to stop */
/* Switch to external phy. Assuming tx and rx are stopped
* because smsc911x_phy_initialise is called before
* smsc911x_rx_initialise and tx_initialise. */
/* Switch to external phy */
hwcfg |= HW_CFG_EXT_PHY_EN_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);
/* Disable phy clocks to the MAC */
hwcfg &= (~HW_CFG_PHY_CLK_SEL_);
hwcfg |= HW_CFG_PHY_CLK_SEL_CLK_DIS_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);
udelay(10); /* Enough time for clocks to stop */
/* Enable phy clocks to the MAC */
hwcfg &= (~HW_CFG_PHY_CLK_SEL_);
hwcfg |= HW_CFG_PHY_CLK_SEL_EXT_PHY_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);
udelay(10); /* Enough time for clocks to restart */
/* Switch to external phy */
hwcfg |= HW_CFG_EXT_PHY_EN_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);
hwcfg |= HW_CFG_SMI_SEL_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);
}
/* Enable phy clocks to the MAC */
hwcfg &= (~HW_CFG_PHY_CLK_SEL_);
hwcfg |= HW_CFG_PHY_CLK_SEL_EXT_PHY_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);
udelay(10); /* Enough time for clocks to restart */
/* Autodetects and enables external phy if present on supported chips.
* autodetection can be overridden by specifying SMSC911X_FORCE_INTERNAL_PHY
* or SMSC911X_FORCE_EXTERNAL_PHY in the platform_data flags. */
static void smsc911x_phy_initialise_external(struct smsc911x_data *pdata)
{
unsigned int hwcfg = smsc911x_reg_read(pdata, HW_CFG);
hwcfg |= HW_CFG_SMI_SEL_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);
SMSC_TRACE(HW, "Successfully switched to external PHY");
if (pdata->config.flags & SMSC911X_FORCE_INTERNAL_PHY) {
SMSC_TRACE(HW, "Forcing internal PHY");
pdata->using_extphy = 0;
} else if (pdata->config.flags & SMSC911X_FORCE_EXTERNAL_PHY) {
SMSC_TRACE(HW, "Forcing external PHY");
smsc911x_phy_enable_external(pdata);
pdata->using_extphy = 1;
} else if (hwcfg & HW_CFG_EXT_PHY_DET_) {
SMSC_TRACE(HW, "HW_CFG EXT_PHY_DET set, using external PHY");
smsc911x_phy_enable_external(pdata);
pdata->using_extphy = 1;
} else {
SMSC_WARNING(HW, "No external PHY detected, "
"Using internal PHY instead.");
/* Use internal phy */
return -ENODEV;
SMSC_TRACE(HW, "HW_CFG EXT_PHY_DET clear, using internal PHY");
pdata->using_extphy = 0;
}
return 0;
}
/* Fetches a tx status out of the status fifo */
@ -825,22 +830,18 @@ static int __devinit smsc911x_mii_init(struct platform_device *pdev,
pdata->mii_bus->parent = &pdev->dev;
pdata->using_extphy = 0;
switch (pdata->idrev & 0xFFFF0000) {
case 0x01170000:
case 0x01150000:
case 0x117A0000:
case 0x115A0000:
/* External PHY supported, try to autodetect */
if (smsc911x_phy_initialise_external(pdata) < 0) {
SMSC_TRACE(HW, "No external PHY detected, "
"using internal PHY");
}
smsc911x_phy_initialise_external(pdata);
break;
default:
SMSC_TRACE(HW, "External PHY is not supported, "
"using internal PHY");
pdata->using_extphy = 0;
break;
}

2
include/linux/smsc911x.h
View File

@ -43,5 +43,7 @@ struct smsc911x_platform_config {
/* Constants for flags */
#define SMSC911X_USE_16BIT (BIT(0))
#define SMSC911X_USE_32BIT (BIT(1))
#define SMSC911X_FORCE_INTERNAL_PHY (BIT(2))
#define SMSC911X_FORCE_EXTERNAL_PHY (BIT(3))
#endif /* __LINUX_SMSC911X_H__ */