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linux/drivers/net/phy/phy-core.c
Heiner Kallweit b8554d4f72 net: phy: add register modifying helpers returning 1 on change 
When modifying registers there are scenarios where we need to know
whether the register content actually changed. This patch adds
new helpers to not break users of the current ones, phy_modify() etc.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-10 12:53:18 -08:00

896 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Core PHY library, taken from phy.c
*/
#include <linux/export.h>
#include <linux/phy.h>
const char *phy_speed_to_str(int speed)
{
switch (speed) {
case SPEED_10:
return "10Mbps";
case SPEED_100:
return "100Mbps";
case SPEED_1000:
return "1Gbps";
case SPEED_2500:
return "2.5Gbps";
case SPEED_5000:
return "5Gbps";
case SPEED_10000:
return "10Gbps";
case SPEED_14000:
return "14Gbps";
case SPEED_20000:
return "20Gbps";
case SPEED_25000:
return "25Gbps";
case SPEED_40000:
return "40Gbps";
case SPEED_50000:
return "50Gbps";
case SPEED_56000:
return "56Gbps";
case SPEED_100000:
return "100Gbps";
case SPEED_UNKNOWN:
return "Unknown";
default:
return "Unsupported (update phy-core.c)";
}
}
EXPORT_SYMBOL_GPL(phy_speed_to_str);
const char *phy_duplex_to_str(unsigned int duplex)
{
if (duplex == DUPLEX_HALF)
return "Half";
if (duplex == DUPLEX_FULL)
return "Full";
if (duplex == DUPLEX_UNKNOWN)
return "Unknown";
return "Unsupported (update phy-core.c)";
}
EXPORT_SYMBOL_GPL(phy_duplex_to_str);
/* A mapping of all SUPPORTED settings to speed/duplex. This table
* must be grouped by speed and sorted in descending match priority
* - iow, descending speed. */
static const struct phy_setting settings[] = {
/* 100G */
{
.speed = SPEED_100000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_100000baseCR4_Full_BIT,
},
{
.speed = SPEED_100000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT,
},
{
.speed = SPEED_100000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_100000baseLR4_ER4_Full_BIT,
},
{
.speed = SPEED_100000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_100000baseSR4_Full_BIT,
},
/* 56G */
{
.speed = SPEED_56000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_56000baseCR4_Full_BIT,
},
{
.speed = SPEED_56000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_56000baseKR4_Full_BIT,
},
{
.speed = SPEED_56000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_56000baseLR4_Full_BIT,
},
{
.speed = SPEED_56000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_56000baseSR4_Full_BIT,
},
/* 50G */
{
.speed = SPEED_50000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_50000baseCR2_Full_BIT,
},
{
.speed = SPEED_50000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_50000baseKR2_Full_BIT,
},
{
.speed = SPEED_50000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_50000baseSR2_Full_BIT,
},
/* 40G */
{
.speed = SPEED_40000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_40000baseCR4_Full_BIT,
},
{
.speed = SPEED_40000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT,
},
{
.speed = SPEED_40000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_40000baseLR4_Full_BIT,
},
{
.speed = SPEED_40000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_40000baseSR4_Full_BIT,
},
/* 25G */
{
.speed = SPEED_25000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_25000baseCR_Full_BIT,
},
{
.speed = SPEED_25000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_25000baseKR_Full_BIT,
},
{
.speed = SPEED_25000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_25000baseSR_Full_BIT,
},
/* 20G */
{
.speed = SPEED_20000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_20000baseKR2_Full_BIT,
},
{
.speed = SPEED_20000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_20000baseMLD2_Full_BIT,
},
/* 10G */
{
.speed = SPEED_10000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_10000baseCR_Full_BIT,
},
{
.speed = SPEED_10000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_10000baseER_Full_BIT,
},
{
.speed = SPEED_10000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
},
{
.speed = SPEED_10000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
},
{
.speed = SPEED_10000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_10000baseLR_Full_BIT,
},
{
.speed = SPEED_10000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_10000baseLRM_Full_BIT,
},
{
.speed = SPEED_10000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_10000baseR_FEC_BIT,
},
{
.speed = SPEED_10000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_10000baseSR_Full_BIT,
},
{
.speed = SPEED_10000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
},
/* 5G */
{
.speed = SPEED_5000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
},
/* 2.5G */
{
.speed = SPEED_2500,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
},
{
.speed = SPEED_2500,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT,
},
/* 1G */
{
.speed = SPEED_1000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
},
{
.speed = SPEED_1000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
},
{
.speed = SPEED_1000,
.duplex = DUPLEX_HALF,
.bit = ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
},
{
.speed = SPEED_1000,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
},
/* 100M */
{
.speed = SPEED_100,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_100baseT_Full_BIT,
},
{
.speed = SPEED_100,
.duplex = DUPLEX_HALF,
.bit = ETHTOOL_LINK_MODE_100baseT_Half_BIT,
},
/* 10M */
{
.speed = SPEED_10,
.duplex = DUPLEX_FULL,
.bit = ETHTOOL_LINK_MODE_10baseT_Full_BIT,
},
{
.speed = SPEED_10,
.duplex = DUPLEX_HALF,
.bit = ETHTOOL_LINK_MODE_10baseT_Half_BIT,
},
};
/**
* phy_lookup_setting - lookup a PHY setting
* @speed: speed to match
* @duplex: duplex to match
* @mask: allowed link modes
* @exact: an exact match is required
*
* Search the settings array for a setting that matches the speed and
* duplex, and which is supported.
*
* If @exact is unset, either an exact match or %NULL for no match will
* be returned.
*
* If @exact is set, an exact match, the fastest supported setting at
* or below the specified speed, the slowest supported setting, or if
* they all fail, %NULL will be returned.
*/
const struct phy_setting *
phy_lookup_setting(int speed, int duplex, const unsigned long *mask, bool exact)
{
const struct phy_setting *p, *match = NULL, *last = NULL;
int i;
for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
if (p->bit < __ETHTOOL_LINK_MODE_MASK_NBITS &&
test_bit(p->bit, mask)) {
last = p;
if (p->speed == speed && p->duplex == duplex) {
/* Exact match for speed and duplex */
match = p;
break;
} else if (!exact) {
if (!match && p->speed <= speed)
/* Candidate */
match = p;
if (p->speed < speed)
break;
}
}
}
if (!match && !exact)
match = last;
return match;
}
EXPORT_SYMBOL_GPL(phy_lookup_setting);
size_t phy_speeds(unsigned int *speeds, size_t size,
unsigned long *mask)
{
size_t count;
int i;
for (i = 0, count = 0; i < ARRAY_SIZE(settings) && count < size; i++)
if (settings[i].bit < __ETHTOOL_LINK_MODE_MASK_NBITS &&
test_bit(settings[i].bit, mask) &&
(count == 0 || speeds[count - 1] != settings[i].speed))
speeds[count++] = settings[i].speed;
return count;
}
/**
* phy_resolve_aneg_linkmode - resolve the advertisements into phy settings
* @phydev: The phy_device struct
*
* Resolve our and the link partner advertisements into their corresponding
* speed and duplex. If full duplex was negotiated, extract the pause mode
* from the link partner mask.
*/
void phy_resolve_aneg_linkmode(struct phy_device *phydev)
{
__ETHTOOL_DECLARE_LINK_MODE_MASK(common);
linkmode_and(common, phydev->lp_advertising, phydev->advertising);
if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT, common)) {
phydev->speed = SPEED_10000;
phydev->duplex = DUPLEX_FULL;
} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
common)) {
phydev->speed = SPEED_5000;
phydev->duplex = DUPLEX_FULL;
} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
common)) {
phydev->speed = SPEED_2500;
phydev->duplex = DUPLEX_FULL;
} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
common)) {
phydev->speed = SPEED_1000;
phydev->duplex = DUPLEX_FULL;
} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
common)) {
phydev->speed = SPEED_1000;
phydev->duplex = DUPLEX_HALF;
} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
common)) {
phydev->speed = SPEED_100;
phydev->duplex = DUPLEX_FULL;
} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
common)) {
phydev->speed = SPEED_100;
phydev->duplex = DUPLEX_HALF;
} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
common)) {
phydev->speed = SPEED_10;
phydev->duplex = DUPLEX_FULL;
} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
common)) {
phydev->speed = SPEED_10;
phydev->duplex = DUPLEX_HALF;
}
if (phydev->duplex == DUPLEX_FULL) {
phydev->pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->lp_advertising);
phydev->asym_pause = linkmode_test_bit(
ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->lp_advertising);
}
}
EXPORT_SYMBOL_GPL(phy_resolve_aneg_linkmode);
static void mmd_phy_indirect(struct mii_bus *bus, int phy_addr, int devad,
u16 regnum)
{
/* Write the desired MMD Devad */
__mdiobus_write(bus, phy_addr, MII_MMD_CTRL, devad);
/* Write the desired MMD register address */
__mdiobus_write(bus, phy_addr, MII_MMD_DATA, regnum);
/* Select the Function : DATA with no post increment */
__mdiobus_write(bus, phy_addr, MII_MMD_CTRL,
devad | MII_MMD_CTRL_NOINCR);
}
/**
* __phy_read_mmd - Convenience function for reading a register
* from an MMD on a given PHY.
* @phydev: The phy_device struct
* @devad: The MMD to read from (0..31)
* @regnum: The register on the MMD to read (0..65535)
*
* Same rules as for __phy_read();
*/
int __phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
{
int val;
if (regnum > (u16)~0 || devad > 32)
return -EINVAL;
if (phydev->drv->read_mmd) {
val = phydev->drv->read_mmd(phydev, devad, regnum);
} else if (phydev->is_c45) {
u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
val = __mdiobus_read(phydev->mdio.bus, phydev->mdio.addr, addr);
} else {
struct mii_bus *bus = phydev->mdio.bus;
int phy_addr = phydev->mdio.addr;
mmd_phy_indirect(bus, phy_addr, devad, regnum);
/* Read the content of the MMD's selected register */
val = __mdiobus_read(bus, phy_addr, MII_MMD_DATA);
}
return val;
}
EXPORT_SYMBOL(__phy_read_mmd);
/**
* phy_read_mmd - Convenience function for reading a register
* from an MMD on a given PHY.
* @phydev: The phy_device struct
* @devad: The MMD to read from
* @regnum: The register on the MMD to read
*
* Same rules as for phy_read();
*/
int phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
{
int ret;
mutex_lock(&phydev->mdio.bus->mdio_lock);
ret = __phy_read_mmd(phydev, devad, regnum);
mutex_unlock(&phydev->mdio.bus->mdio_lock);
return ret;
}
EXPORT_SYMBOL(phy_read_mmd);
/**
* __phy_write_mmd - Convenience function for writing a register
* on an MMD on a given PHY.
* @phydev: The phy_device struct
* @devad: The MMD to read from
* @regnum: The register on the MMD to read
* @val: value to write to @regnum
*
* Same rules as for __phy_write();
*/
int __phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
{
int ret;
if (regnum > (u16)~0 || devad > 32)
return -EINVAL;
if (phydev->drv->write_mmd) {
ret = phydev->drv->write_mmd(phydev, devad, regnum, val);
} else if (phydev->is_c45) {
u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
ret = __mdiobus_write(phydev->mdio.bus, phydev->mdio.addr,
addr, val);
} else {
struct mii_bus *bus = phydev->mdio.bus;
int phy_addr = phydev->mdio.addr;
mmd_phy_indirect(bus, phy_addr, devad, regnum);
/* Write the data into MMD's selected register */
__mdiobus_write(bus, phy_addr, MII_MMD_DATA, val);
ret = 0;
}
return ret;
}
EXPORT_SYMBOL(__phy_write_mmd);
/**
* phy_write_mmd - Convenience function for writing a register
* on an MMD on a given PHY.
* @phydev: The phy_device struct
* @devad: The MMD to read from
* @regnum: The register on the MMD to read
* @val: value to write to @regnum
*
* Same rules as for phy_write();
*/
int phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
{
int ret;
mutex_lock(&phydev->mdio.bus->mdio_lock);
ret = __phy_write_mmd(phydev, devad, regnum, val);
mutex_unlock(&phydev->mdio.bus->mdio_lock);
return ret;
}
EXPORT_SYMBOL(phy_write_mmd);
/**
* __phy_modify_changed() - Convenience function for modifying a PHY register
* @phydev: a pointer to a &struct phy_device
* @regnum: register number
* @mask: bit mask of bits to clear
* @set: bit mask of bits to set
*
* Unlocked helper function which allows a PHY register to be modified as
* new register value = (old register value & ~mask) | set
*
* Returns negative errno, 0 if there was no change, and 1 in case of change
*/
int __phy_modify_changed(struct phy_device *phydev, u32 regnum, u16 mask,
u16 set)
{
int new, ret;
ret = __phy_read(phydev, regnum);
if (ret < 0)
return ret;
new = (ret & ~mask) | set;
if (new == ret)
return 0;
ret = __phy_write(phydev, regnum, new);
return ret < 0 ? ret : 1;
}
EXPORT_SYMBOL_GPL(__phy_modify_changed);
/**
* phy_modify_changed - Function for modifying a PHY register
* @phydev: the phy_device struct
* @regnum: register number to modify
* @mask: bit mask of bits to clear
* @set: new value of bits set in mask to write to @regnum
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*
* Returns negative errno, 0 if there was no change, and 1 in case of change
*/
int phy_modify_changed(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
{
int ret;
mutex_lock(&phydev->mdio.bus->mdio_lock);
ret = __phy_modify_changed(phydev, regnum, mask, set);
mutex_unlock(&phydev->mdio.bus->mdio_lock);
return ret;
}
EXPORT_SYMBOL_GPL(phy_modify_changed);
/**
* __phy_modify - Convenience function for modifying a PHY register
* @phydev: the phy_device struct
* @regnum: register number to modify
* @mask: bit mask of bits to clear
* @set: new value of bits set in mask to write to @regnum
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
int __phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
{
int ret;
ret = __phy_modify_changed(phydev, regnum, mask, set);
return ret < 0 ? ret : 0;
}
EXPORT_SYMBOL_GPL(__phy_modify);
/**
* phy_modify - Convenience function for modifying a given PHY register
* @phydev: the phy_device struct
* @regnum: register number to write
* @mask: bit mask of bits to clear
* @set: new value of bits set in mask to write to @regnum
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
int phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
{
int ret;
mutex_lock(&phydev->mdio.bus->mdio_lock);
ret = __phy_modify(phydev, regnum, mask, set);
mutex_unlock(&phydev->mdio.bus->mdio_lock);
return ret;
}
EXPORT_SYMBOL_GPL(phy_modify);
/**
* __phy_modify_mmd_changed - Function for modifying a register on MMD
* @phydev: the phy_device struct
* @devad: the MMD containing register to modify
* @regnum: register number to modify
* @mask: bit mask of bits to clear
* @set: new value of bits set in mask to write to @regnum
*
* Unlocked helper function which allows a MMD register to be modified as
* new register value = (old register value & ~mask) | set
*
* Returns negative errno, 0 if there was no change, and 1 in case of change
*/
int __phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum,
u16 mask, u16 set)
{
int new, ret;
ret = __phy_read_mmd(phydev, devad, regnum);
if (ret < 0)
return ret;
new = (ret & ~mask) | set;
if (new == ret)
return 0;
ret = __phy_write_mmd(phydev, devad, regnum, new);
return ret < 0 ? ret : 1;
}
EXPORT_SYMBOL_GPL(__phy_modify_mmd_changed);
/**
* phy_modify_mmd_changed - Function for modifying a register on MMD
* @phydev: the phy_device struct
* @devad: the MMD containing register to modify
* @regnum: register number to modify
* @mask: bit mask of bits to clear
* @set: new value of bits set in mask to write to @regnum
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*
* Returns negative errno, 0 if there was no change, and 1 in case of change
*/
int phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum,
u16 mask, u16 set)
{
int ret;
mutex_lock(&phydev->mdio.bus->mdio_lock);
ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set);
mutex_unlock(&phydev->mdio.bus->mdio_lock);
return ret;
}
EXPORT_SYMBOL_GPL(phy_modify_mmd_changed);
/**
* __phy_modify_mmd - Convenience function for modifying a register on MMD
* @phydev: the phy_device struct
* @devad: the MMD containing register to modify
* @regnum: register number to modify
* @mask: bit mask of bits to clear
* @set: new value of bits set in mask to write to @regnum
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
int __phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum,
u16 mask, u16 set)
{
int ret;
ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set);
return ret < 0 ? ret : 0;
}
EXPORT_SYMBOL_GPL(__phy_modify_mmd);
/**
* phy_modify_mmd - Convenience function for modifying a register on MMD
* @phydev: the phy_device struct
* @devad: the MMD containing register to modify
* @regnum: register number to modify
* @mask: bit mask of bits to clear
* @set: new value of bits set in mask to write to @regnum
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
int phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum,
u16 mask, u16 set)
{
int ret;
mutex_lock(&phydev->mdio.bus->mdio_lock);
ret = __phy_modify_mmd(phydev, devad, regnum, mask, set);
mutex_unlock(&phydev->mdio.bus->mdio_lock);
return ret;
}
EXPORT_SYMBOL_GPL(phy_modify_mmd);
static int __phy_read_page(struct phy_device *phydev)
{
return phydev->drv->read_page(phydev);
}
static int __phy_write_page(struct phy_device *phydev, int page)
{
return phydev->drv->write_page(phydev, page);
}
/**
* phy_save_page() - take the bus lock and save the current page
* @phydev: a pointer to a &struct phy_device
*
* Take the MDIO bus lock, and return the current page number. On error,
* returns a negative errno. phy_restore_page() must always be called
* after this, irrespective of success or failure of this call.
*/
int phy_save_page(struct phy_device *phydev)
{
mutex_lock(&phydev->mdio.bus->mdio_lock);
return __phy_read_page(phydev);
}
EXPORT_SYMBOL_GPL(phy_save_page);
/**
* phy_select_page() - take the bus lock, save the current page, and set a page
* @phydev: a pointer to a &struct phy_device
* @page: desired page
*
* Take the MDIO bus lock to protect against concurrent access, save the
* current PHY page, and set the current page. On error, returns a
* negative errno, otherwise returns the previous page number.
* phy_restore_page() must always be called after this, irrespective
* of success or failure of this call.
*/
int phy_select_page(struct phy_device *phydev, int page)
{
int ret, oldpage;
oldpage = ret = phy_save_page(phydev);
if (ret < 0)
return ret;
if (oldpage != page) {
ret = __phy_write_page(phydev, page);
if (ret < 0)
return ret;
}
return oldpage;
}
EXPORT_SYMBOL_GPL(phy_select_page);
/**
* phy_restore_page() - restore the page register and release the bus lock
* @phydev: a pointer to a &struct phy_device
* @oldpage: the old page, return value from phy_save_page() or phy_select_page()
* @ret: operation's return code
*
* Release the MDIO bus lock, restoring @oldpage if it is a valid page.
* This function propagates the earliest error code from the group of
* operations.
*
* Returns:
* @oldpage if it was a negative value, otherwise
* @ret if it was a negative errno value, otherwise
* phy_write_page()'s negative value if it were in error, otherwise
* @ret.
*/
int phy_restore_page(struct phy_device *phydev, int oldpage, int ret)
{
int r;
if (oldpage >= 0) {
r = __phy_write_page(phydev, oldpage);
/* Propagate the operation return code if the page write
* was successful.
*/
if (ret >= 0 && r < 0)
ret = r;
} else {
/* Propagate the phy page selection error code */
ret = oldpage;
}
mutex_unlock(&phydev->mdio.bus->mdio_lock);
return ret;
}
EXPORT_SYMBOL_GPL(phy_restore_page);
/**
* phy_read_paged() - Convenience function for reading a paged register
* @phydev: a pointer to a &struct phy_device
* @page: the page for the phy
* @regnum: register number
*
* Same rules as for phy_read().
*/
int phy_read_paged(struct phy_device *phydev, int page, u32 regnum)
{
int ret = 0, oldpage;
oldpage = phy_select_page(phydev, page);
if (oldpage >= 0)
ret = __phy_read(phydev, regnum);
return phy_restore_page(phydev, oldpage, ret);
}
EXPORT_SYMBOL(phy_read_paged);
/**
* phy_write_paged() - Convenience function for writing a paged register
* @phydev: a pointer to a &struct phy_device
* @page: the page for the phy
* @regnum: register number
* @val: value to write
*
* Same rules as for phy_write().
*/
int phy_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val)
{
int ret = 0, oldpage;
oldpage = phy_select_page(phydev, page);
if (oldpage >= 0)
ret = __phy_write(phydev, regnum, val);
return phy_restore_page(phydev, oldpage, ret);
}
EXPORT_SYMBOL(phy_write_paged);
/**
* phy_modify_paged() - Convenience function for modifying a paged register
* @phydev: a pointer to a &struct phy_device
* @page: the page for the phy
* @regnum: register number
* @mask: bit mask of bits to clear
* @set: bit mask of bits to set
*
* Same rules as for phy_read() and phy_write().
*/
int phy_modify_paged(struct phy_device *phydev, int page, u32 regnum,
u16 mask, u16 set)
{
int ret = 0, oldpage;
oldpage = phy_select_page(phydev, page);
if (oldpage >= 0)
ret = __phy_modify(phydev, regnum, mask, set);
return phy_restore_page(phydev, oldpage, ret);
}
EXPORT_SYMBOL(phy_modify_paged);
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