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net: phy: broadcom: add bcm54xx_auxctl_read
Add a helper function to read the AUXCTL register for the BCM54xx. This mirrors the bcm54xx_auxctl_write function already present in the code. Signed-off-by: Jon Mason <jon.mason@broadcom.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -30,6 +30,16 @@ MODULE_DESCRIPTION("Broadcom PHY driver");
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MODULE_AUTHOR("Maciej W. Rozycki");
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MODULE_LICENSE("GPL");
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static int bcm54xx_auxctl_read(struct phy_device *phydev, u16 regnum)
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{
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/* The register must be written to both the Shadow Register Select and
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* the Shadow Read Register Selector
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*/
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phy_write(phydev, MII_BCM54XX_AUX_CTL, regnum |
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regnum << MII_BCM54XX_AUXCTL_SHDWSEL_READ_SHIFT);
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return phy_read(phydev, MII_BCM54XX_AUX_CTL);
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}
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static int bcm54xx_auxctl_write(struct phy_device *phydev, u16 regnum, u16 val)
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{
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return phy_write(phydev, MII_BCM54XX_AUX_CTL, regnum | val);
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@ -110,6 +110,7 @@
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#define MII_BCM54XX_AUXCTL_MISC_FORCE_AMDIX 0x0200
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#define MII_BCM54XX_AUXCTL_MISC_RDSEL_MISC 0x7000
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#define MII_BCM54XX_AUXCTL_SHDWSEL_MISC 0x0007
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#define MII_BCM54XX_AUXCTL_SHDWSEL_READ_SHIFT 12
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#define MII_BCM54XX_AUXCTL_SHDWSEL_MASK 0x0007
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