@@ -128,6 +128,10 @@
#define BCM54140_DEFAULT_DOWNSHIFT 5
#define BCM54140_MAX_DOWNSHIFT 9
+enum bcm54140_global_phy {
+ BCM54140_BASE_ADDR = 0,
+};
+
struct bcm54140_priv {
int port;
int base_addr;
@@ -429,11 +433,13 @@ static int bcm54140_base_read_rdb(struct phy_device *phydev, u16 rdb)
int ret;
phy_lock_mdio_bus(phydev);
- ret = __phy_package_write(phydev, MII_BCM54XX_RDB_ADDR, rdb);
+ ret = __phy_package_write(phydev, BCM54140_BASE_ADDR,
+ MII_BCM54XX_RDB_ADDR, rdb);
if (ret < 0)
goto out;
- ret = __phy_package_read(phydev, MII_BCM54XX_RDB_DATA);
+ ret = __phy_package_read(phydev, BCM54140_BASE_ADDR,
+ MII_BCM54XX_RDB_DATA);
out:
phy_unlock_mdio_bus(phydev);
@@ -446,11 +452,13 @@ static int bcm54140_base_write_rdb(struct phy_device *phydev,
int ret;
phy_lock_mdio_bus(phydev);
- ret = __phy_package_write(phydev, MII_BCM54XX_RDB_ADDR, rdb);
+ ret = __phy_package_write(phydev, BCM54140_BASE_ADDR,
+ MII_BCM54XX_RDB_ADDR, rdb);
if (ret < 0)
goto out;
- ret = __phy_package_write(phydev, MII_BCM54XX_RDB_DATA, val);
+ ret = __phy_package_write(phydev, BCM54140_BASE_ADDR,
+ MII_BCM54XX_RDB_DATA, val);
out:
phy_unlock_mdio_bus(phydev);
@@ -416,6 +416,11 @@ struct vsc8531_private {
* gpio_lock: used for PHC operations. Common for all PHYs as the load/save GPIO
* is shared.
*/
+
+enum vsc85xx_global_phy {
+ VSC88XX_BASE_ADDR = 0,
+};
+
struct vsc85xx_shared_private {
struct mutex gpio_lock;
};
@@ -711,7 +711,7 @@ int phy_base_write(struct phy_device *phydev, u32 regnum, u16 val)
dump_stack();
}
- return __phy_package_write(phydev, regnum, val);
+ return __phy_package_write(phydev, VSC88XX_BASE_ADDR, regnum, val);
}
/* phydev->bus->mdio_lock should be locked when using this function */
@@ -722,7 +722,7 @@ int phy_base_read(struct phy_device *phydev, u32 regnum)
dump_stack();
}
- return __phy_package_read(phydev, regnum);
+ return __phy_package_read(phydev, VSC88XX_BASE_ADDR, regnum);
}
u32 vsc85xx_csr_read(struct phy_device *phydev,
@@ -1648,20 +1648,22 @@ EXPORT_SYMBOL_GPL(phy_driver_is_genphy_10g);
/**
* phy_package_join - join a common PHY group
* @phydev: target phy_device struct
- * @addr: cookie and PHY address for global register access
+ * @base_addr: cookie and base PHY address of PHY package for offset
+ * calculation of global register access
* @priv_size: if non-zero allocate this amount of bytes for private data
*
* This joins a PHY group and provides a shared storage for all phydevs in
* this group. This is intended to be used for packages which contain
* more than one PHY, for example a quad PHY transceiver.
*
- * The addr parameter serves as a cookie which has to have the same value
- * for all members of one group and as a PHY address to access generic
- * registers of a PHY package. Usually, one of the PHY addresses of the
- * different PHYs in the package provides access to these global registers.
+ * The base_addr parameter serves as cookie which has to have the same values
+ * for all members of one group and as the base PHY address of the PHY package
+ * for offset calculation to access generic registers of a PHY package.
+ * Usually, one of the PHY addresses of the different PHYs in the package
+ * provides access to these global registers.
* The address which is given here, will be used in the phy_package_read()
- * and phy_package_write() convenience functions. If your PHY doesn't have
- * global registers you can just pick any of the PHY addresses.
+ * and phy_package_write() convenience functions as base and added to the
+ * passed offset in those functions.
*
* This will set the shared pointer of the phydev to the shared storage.
* If this is the first call for a this cookie the shared storage will be
@@ -1671,17 +1673,17 @@ EXPORT_SYMBOL_GPL(phy_driver_is_genphy_10g);
* Returns < 1 on error, 0 on success. Esp. calling phy_package_join()
* with the same cookie but a different priv_size is an error.
*/
-int phy_package_join(struct phy_device *phydev, int addr, size_t priv_size)
+int phy_package_join(struct phy_device *phydev, int base_addr, size_t priv_size)
{
struct mii_bus *bus = phydev->mdio.bus;
struct phy_package_shared *shared;
int ret;
- if (addr < 0 || addr >= PHY_MAX_ADDR)
+ if (base_addr < 0 || base_addr >= PHY_MAX_ADDR)
return -EINVAL;
mutex_lock(&bus->shared_lock);
- shared = bus->shared[addr];
+ shared = bus->shared[base_addr];
if (!shared) {
ret = -ENOMEM;
shared = kzalloc(sizeof(*shared), GFP_KERNEL);
@@ -1693,9 +1695,9 @@ int phy_package_join(struct phy_device *phydev, int addr, size_t priv_size)
goto err_free;
shared->priv_size = priv_size;
}
- shared->addr = addr;
+ shared->base_addr = base_addr;
refcount_set(&shared->refcnt, 1);
- bus->shared[addr] = shared;
+ bus->shared[base_addr] = shared;
} else {
ret = -EINVAL;
if (priv_size && priv_size != shared->priv_size)
@@ -1733,7 +1735,7 @@ void phy_package_leave(struct phy_device *phydev)
return;
if (refcount_dec_and_mutex_lock(&shared->refcnt, &bus->shared_lock)) {
- bus->shared[shared->addr] = NULL;
+ bus->shared[shared->base_addr] = NULL;
mutex_unlock(&bus->shared_lock);
kfree(shared->priv);
kfree(shared);
@@ -1752,7 +1754,8 @@ static void devm_phy_package_leave(struct device *dev, void *res)
* devm_phy_package_join - resource managed phy_package_join()
* @dev: device that is registering this PHY package
* @phydev: target phy_device struct
- * @addr: cookie and PHY address for global register access
+ * @base_addr: cookie and base PHY address of PHY package for offset
+ * calculation of global register access
* @priv_size: if non-zero allocate this amount of bytes for private data
*
* Managed phy_package_join(). Shared storage fetched by this function,
@@ -1760,7 +1763,7 @@ static void devm_phy_package_leave(struct device *dev, void *res)
* phy_package_join() for more information.
*/
int devm_phy_package_join(struct device *dev, struct phy_device *phydev,
- int addr, size_t priv_size)
+ int base_addr, size_t priv_size)
{
struct phy_device **ptr;
int ret;
@@ -1770,7 +1773,7 @@ int devm_phy_package_join(struct device *dev, struct phy_device *phydev,
if (!ptr)
return -ENOMEM;
- ret = phy_package_join(phydev, addr, priv_size);
+ ret = phy_package_join(phydev, base_addr, priv_size);
if (!ret) {
*ptr = phydev;
@@ -327,7 +327,8 @@ struct mdio_bus_stats {
/**
* struct phy_package_shared - Shared information in PHY packages
- * @addr: Common PHY address used to combine PHYs in one package
+ * @base_addr: Base PHY address of PHY package used to combine PHYs
+ * in one package and for offset calculation of phy_package_read/write
* @refcnt: Number of PHYs connected to this shared data
* @flags: Initialization of PHY package
* @priv_size: Size of the shared private data @priv
@@ -338,7 +339,7 @@ struct mdio_bus_stats {
* phy_package_leave().
*/
struct phy_package_shared {
- u8 addr;
+ u8 base_addr;
refcount_t refcnt;
unsigned long flags;
size_t priv_size;
@@ -1972,10 +1973,10 @@ int phy_ethtool_get_link_ksettings(struct net_device *ndev,
int phy_ethtool_set_link_ksettings(struct net_device *ndev,
const struct ethtool_link_ksettings *cmd);
int phy_ethtool_nway_reset(struct net_device *ndev);
-int phy_package_join(struct phy_device *phydev, int addr, size_t priv_size);
+int phy_package_join(struct phy_device *phydev, int base_addr, size_t priv_size);
void phy_package_leave(struct phy_device *phydev);
int devm_phy_package_join(struct device *dev, struct phy_device *phydev,
- int addr, size_t priv_size);
+ int base_addr, size_t priv_size);
int __init mdio_bus_init(void);
void mdio_bus_exit(void);
@@ -1998,46 +1999,65 @@ int __phy_hwtstamp_set(struct phy_device *phydev,
struct kernel_hwtstamp_config *config,
struct netlink_ext_ack *extack);
-static inline int phy_package_read(struct phy_device *phydev, u32 regnum)
+static inline int phy_package_address(struct phy_device *phydev,
+ unsigned int addr_offset)
{
struct phy_package_shared *shared = phydev->shared;
+ u8 base_addr = shared->base_addr;
- if (!shared)
+ if (addr_offset >= PHY_MAX_ADDR - base_addr)
return -EIO;
- return mdiobus_read(phydev->mdio.bus, shared->addr, regnum);
+ /* we know that addr will be in the range 0..31 and thus the
+ * implicit cast to a signed int is not a problem.
+ */
+ return base_addr + addr_offset;
}
-static inline int __phy_package_read(struct phy_device *phydev, u32 regnum)
+static inline int phy_package_read(struct phy_device *phydev,
+ unsigned int addr_offset, u32 regnum)
{
- struct phy_package_shared *shared = phydev->shared;
+ int addr = phy_package_address(phydev, addr_offset);
- if (!shared)
- return -EIO;
+ if (addr < 0)
+ return addr;
+
+ return mdiobus_read(phydev->mdio.bus, addr, regnum);
+}
+
+static inline int __phy_package_read(struct phy_device *phydev,
+ unsigned int addr_offset, u32 regnum)
+{
+ int addr = phy_package_address(phydev, addr_offset);
+
+ if (addr < 0)
+ return addr;
- return __mdiobus_read(phydev->mdio.bus, shared->addr, regnum);
+ return __mdiobus_read(phydev->mdio.bus, addr, regnum);
}
static inline int phy_package_write(struct phy_device *phydev,
- u32 regnum, u16 val)
+ unsigned int addr_offset, u32 regnum,
+ u16 val)
{
- struct phy_package_shared *shared = phydev->shared;
+ int addr = phy_package_address(phydev, addr_offset);
- if (!shared)
- return -EIO;
+ if (addr < 0)
+ return addr;
- return mdiobus_write(phydev->mdio.bus, shared->addr, regnum, val);
+ return mdiobus_write(phydev->mdio.bus, addr, regnum, val);
}
static inline int __phy_package_write(struct phy_device *phydev,
- u32 regnum, u16 val)
+ unsigned int addr_offset, u32 regnum,
+ u16 val)
{
- struct phy_package_shared *shared = phydev->shared;
+ int addr = phy_package_address(phydev, addr_offset);
- if (!shared)
- return -EIO;
+ if (addr < 0)
+ return addr;
- return __mdiobus_write(phydev->mdio.bus, shared->addr, regnum, val);
+ return __mdiobus_write(phydev->mdio.bus, addr, regnum, val);
}
static inline bool __phy_package_set_once(struct phy_device *phydev,
Current API for PHY package are limited to single address to configure global settings for the PHY package. It was found that some PHY package (for example the qca807x, a PHY package that is shipped with a bundle of 5 PHY) requires multiple PHY address to configure global settings. An example scenario is a PHY that have a dedicated PHY for PSGMII/serdes calibrarion and have a specific PHY in the package where the global PHY mode is set and affects every other PHY in the package. Change the API in the following way: - Change phy_package_join() to take the base addr of the PHY package instead of the global PHY addr. - Make __/phy_package_write/read() require an additional arg that select what global PHY address to use by passing the offset from the base addr passed on phy_package_join(). Each user of this API is updated to follow this new implementation following a pattern where an enum is defined to declare the offset of the addr. We also drop the check if shared is defined as any user of the phy_package_read/write is expected to use phy_package_join first. Misuse of this will correctly trigger a kernel panic for NULL pointer exception. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> --- Changes v8: - Introduce helper to validate final addr Changes v7: - Change addr to u8 Changes v2: - Make kernel panic if shared is not init (bugged scenario) - Fix some confusing comments drivers/net/phy/bcm54140.c | 16 ++++++-- drivers/net/phy/mscc/mscc.h | 5 +++ drivers/net/phy/mscc/mscc_main.c | 4 +- drivers/net/phy/phy_device.c | 35 +++++++++-------- include/linux/phy.h | 64 +++++++++++++++++++++----------- 5 files changed, 80 insertions(+), 44 deletions(-)