// SPDX-License-Identifier: GPL-2.0-or-later /* * PHY package support
*/
#include <linux/of.h> #include <linux/phy.h>
#include"phylib.h" #include"phylib-internal.h"
/** * struct phy_package_shared - Shared information in PHY packages * @base_addr: Base PHY address of PHY package used to combine PHYs * in one package and for offset calculation of phy_package_read/write * @np: Pointer to the Device Node if PHY package defined in DT * @refcnt: Number of PHYs connected to this shared data * @flags: Initialization of PHY package * @priv_size: Size of the shared private data @priv * @priv: Driver private data shared across a PHY package * * Represents a shared structure between different phydev's in the same * package, for example a quad PHY. See phy_package_join() and * phy_package_leave().
*/ struct phy_package_shared {
u8 base_addr; /* With PHY package defined in DT this points to the PHY package node */ struct device_node *np;
refcount_t refcnt; unsignedlong flags;
size_t priv_size;
/* private data pointer */ /* note that this pointer is shared between different phydevs and * the user has to take care of appropriate locking. It is allocated * and freed automatically by phy_package_join() and * phy_package_leave().
*/ void *priv;
};
/** * __phy_package_read_mmd - read MMD reg relative to PHY package base addr * @phydev: The phy_device struct * @addr_offset: The offset to be added to PHY package base_addr * @devad: The MMD to read from * @regnum: The register on the MMD to read * * Convenience helper for reading a register of an MMD on a given PHY * using the PHY package base address. The base address is added to * the addr_offset value. * * Same calling rules as for __phy_read(); * * NOTE: It's assumed that the entire PHY package is either C22 or C45.
*/ int __phy_package_read_mmd(struct phy_device *phydev, unsignedint addr_offset, int devad,
u32 regnum)
{ int addr = phy_package_address(phydev, addr_offset);
if (addr < 0) return addr;
if (regnum > (u16)~0 || devad > 32) return -EINVAL;
/** * __phy_package_write_mmd - write MMD reg relative to PHY package base addr * @phydev: The phy_device struct * @addr_offset: The offset to be added to PHY package base_addr * @devad: The MMD to write to * @regnum: The register on the MMD to write * @val: value to write to @regnum * * Convenience helper for writing a register of an MMD on a given PHY * using the PHY package base address. The base address is added to * the addr_offset value. * * Same calling rules as for __phy_write(); * * NOTE: It's assumed that the entire PHY package is either C22 or C45.
*/ int __phy_package_write_mmd(struct phy_device *phydev, unsignedint addr_offset, int devad,
u32 regnum, u16 val)
{ int addr = phy_package_address(phydev, addr_offset);
if (addr < 0) return addr;
if (regnum > (u16)~0 || devad > 32) return -EINVAL;
/** * phy_package_join - join a common PHY group * @phydev: target phy_device struct * @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 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 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 * allocated. If priv_size is non-zero, the given amount of bytes are * allocated for the priv member. * * 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 base_addr, size_t priv_size)
{ struct mii_bus *bus = phydev->mdio.bus; struct phy_package_shared *shared; int ret;
if (base_addr < 0 || base_addr >= PHY_MAX_ADDR) return -EINVAL;
mutex_lock(&bus->shared_lock);
shared = bus->shared[base_addr]; if (!shared) {
ret = -ENOMEM;
shared = kzalloc(sizeof(*shared), GFP_KERNEL); if (!shared) goto err_unlock; if (priv_size) {
shared->priv = kzalloc(priv_size, GFP_KERNEL); if (!shared->priv) goto err_free;
shared->priv_size = priv_size;
}
shared->base_addr = base_addr;
shared->np = NULL;
refcount_set(&shared->refcnt, 1);
bus->shared[base_addr] = shared;
} else {
ret = -EINVAL; if (priv_size && priv_size != shared->priv_size) goto err_unlock;
refcount_inc(&shared->refcnt);
}
mutex_unlock(&bus->shared_lock);
/** * of_phy_package_join - join a common PHY group in PHY package * @phydev: target phy_device struct * @priv_size: if non-zero allocate this amount of bytes for private data * * This is a variant of phy_package_join for PHY package defined in DT. * * The parent node of the @phydev is checked as a valid PHY package node * structure (by matching the node name "ethernet-phy-package") and the * base_addr for the PHY package is passed to phy_package_join. * * With this configuration the shared struct will also have the np value * filled to use additional DT defined properties in PHY specific * probe_once and config_init_once PHY package OPs. * * Returns < 0 on error, 0 on success. Esp. calling phy_package_join() * with the same cookie but a different priv_size is an error. Or a parent * node is not detected or is not valid or doesn't match the expected node * name for PHY package.
*/ int of_phy_package_join(struct phy_device *phydev, size_t priv_size)
{ struct device_node *node = phydev->mdio.dev.of_node; struct device_node *package_node;
u32 base_addr; int ret;
if (!node) return -EINVAL;
package_node = of_get_parent(node); if (!package_node) return -EINVAL;
if (!of_node_name_eq(package_node, "ethernet-phy-package")) {
ret = -EINVAL; gotoexit;
}
if (of_property_read_u32(package_node, "reg", &base_addr)) {
ret = -EINVAL; gotoexit;
}
ret = phy_package_join(phydev, base_addr, priv_size); if (ret) gotoexit;
/** * phy_package_leave - leave a common PHY group * @phydev: target phy_device struct * * This leaves a PHY group created by phy_package_join(). If this phydev * was the last user of the shared data between the group, this data is * freed. Resets the phydev->shared pointer to NULL.
*/ void phy_package_leave(struct phy_device *phydev)
{ struct phy_package_shared *shared = phydev->shared; struct mii_bus *bus = phydev->mdio.bus;
if (!shared) return;
/* Decrease the node refcount on leave if present */ if (shared->np)
of_node_put(shared->np);
/** * devm_phy_package_join - resource managed phy_package_join() * @dev: device that is registering this PHY package * @phydev: target phy_device struct * @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, * phy_package_leave() is automatically called on driver detach. See * phy_package_join() for more information.
*/ int devm_phy_package_join(struct device *dev, struct phy_device *phydev, int base_addr, size_t priv_size)
{ struct phy_device **ptr; int ret;
ptr = devres_alloc(devm_phy_package_leave, sizeof(*ptr),
GFP_KERNEL); if (!ptr) return -ENOMEM;
ret = phy_package_join(phydev, base_addr, priv_size);
/** * devm_of_phy_package_join - resource managed of_phy_package_join() * @dev: device that is registering this PHY package * @phydev: target phy_device struct * @priv_size: if non-zero allocate this amount of bytes for private data * * Managed of_phy_package_join(). Shared storage fetched by this function, * phy_package_leave() is automatically called on driver detach. See * of_phy_package_join() for more information.
*/ int devm_of_phy_package_join(struct device *dev, struct phy_device *phydev,
size_t priv_size)
{ struct phy_device **ptr; int ret;
ptr = devres_alloc(devm_phy_package_leave, sizeof(*ptr),
GFP_KERNEL); if (!ptr) return -ENOMEM;
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