diff options
Diffstat (limited to 'drivers/of/of_mdio.c')
| -rw-r--r-- | drivers/of/of_mdio.c | 492 |
1 files changed, 0 insertions, 492 deletions
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c deleted file mode 100644 index e0dbd6e48a98..000000000000 --- a/drivers/of/of_mdio.c +++ /dev/null @@ -1,492 +0,0 @@ -/* - * OF helpers for the MDIO (Ethernet PHY) API - * - * Copyright (c) 2009 Secret Lab Technologies, Ltd. - * - * This file is released under the GPLv2 - * - * This file provides helper functions for extracting PHY device information - * out of the OpenFirmware device tree and using it to populate an mii_bus. - */ - -#include <linux/kernel.h> -#include <linux/device.h> -#include <linux/netdevice.h> -#include <linux/err.h> -#include <linux/phy.h> -#include <linux/phy_fixed.h> -#include <linux/of.h> -#include <linux/of_gpio.h> -#include <linux/of_irq.h> -#include <linux/of_mdio.h> -#include <linux/of_net.h> -#include <linux/module.h> - -#define DEFAULT_GPIO_RESET_DELAY 10 /* in microseconds */ - -MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); -MODULE_LICENSE("GPL"); - -/* Extract the clause 22 phy ID from the compatible string of the form - * ethernet-phy-idAAAA.BBBB */ -static int of_get_phy_id(struct device_node *device, u32 *phy_id) -{ - struct property *prop; - const char *cp; - unsigned int upper, lower; - - of_property_for_each_string(device, "compatible", prop, cp) { - if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) { - *phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF); - return 0; - } - } - return -EINVAL; -} - -static void of_mdiobus_register_phy(struct mii_bus *mdio, - struct device_node *child, u32 addr) -{ - struct phy_device *phy; - bool is_c45; - int rc; - u32 phy_id; - - is_c45 = of_device_is_compatible(child, - "ethernet-phy-ieee802.3-c45"); - - if (!is_c45 && !of_get_phy_id(child, &phy_id)) - phy = phy_device_create(mdio, addr, phy_id, 0, NULL); - else - phy = get_phy_device(mdio, addr, is_c45); - if (IS_ERR(phy)) - return; - - rc = irq_of_parse_and_map(child, 0); - if (rc > 0) { - phy->irq = rc; - mdio->irq[addr] = rc; - } else { - phy->irq = mdio->irq[addr]; - } - - if (of_property_read_bool(child, "broken-turn-around")) - mdio->phy_ignore_ta_mask |= 1 << addr; - - /* Associate the OF node with the device structure so it - * can be looked up later */ - of_node_get(child); - phy->mdio.dev.of_node = child; - - /* All data is now stored in the phy struct; - * register it */ - rc = phy_device_register(phy); - if (rc) { - phy_device_free(phy); - of_node_put(child); - return; - } - - dev_dbg(&mdio->dev, "registered phy %s at address %i\n", - child->name, addr); -} - -static void of_mdiobus_register_device(struct mii_bus *mdio, - struct device_node *child, u32 addr) -{ - struct mdio_device *mdiodev; - int rc; - - mdiodev = mdio_device_create(mdio, addr); - if (IS_ERR(mdiodev)) - return; - - /* Associate the OF node with the device structure so it - * can be looked up later. - */ - of_node_get(child); - mdiodev->dev.of_node = child; - - /* All data is now stored in the mdiodev struct; register it. */ - rc = mdio_device_register(mdiodev); - if (rc) { - mdio_device_free(mdiodev); - of_node_put(child); - return; - } - - dev_dbg(&mdio->dev, "registered mdio device %s at address %i\n", - child->name, addr); -} - -/* The following is a list of PHY compatible strings which appear in - * some DTBs. The compatible string is never matched against a PHY - * driver, so is pointless. We only expect devices which are not PHYs - * to have a compatible string, so they can be matched to an MDIO - * driver. Encourage users to upgrade their DT blobs to remove these. - */ -static const struct of_device_id whitelist_phys[] = { - { .compatible = "brcm,40nm-ephy" }, - { .compatible = "broadcom,bcm5241" }, - { .compatible = "marvell,88E1111", }, - { .compatible = "marvell,88e1116", }, - { .compatible = "marvell,88e1118", }, - { .compatible = "marvell,88e1145", }, - { .compatible = "marvell,88e1149r", }, - { .compatible = "marvell,88e1310", }, - { .compatible = "marvell,88E1510", }, - { .compatible = "marvell,88E1514", }, - { .compatible = "moxa,moxart-rtl8201cp", }, - {} -}; - -/* - * Return true if the child node is for a phy. It must either: - * o Compatible string of "ethernet-phy-idX.X" - * o Compatible string of "ethernet-phy-ieee802.3-c45" - * o Compatible string of "ethernet-phy-ieee802.3-c22" - * o In the white list above (and issue a warning) - * o No compatibility string - * - * A device which is not a phy is expected to have a compatible string - * indicating what sort of device it is. - */ -static bool of_mdiobus_child_is_phy(struct device_node *child) -{ - u32 phy_id; - - if (of_get_phy_id(child, &phy_id) != -EINVAL) - return true; - - if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c45")) - return true; - - if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c22")) - return true; - - if (of_match_node(whitelist_phys, child)) { - pr_warn(FW_WARN - "%s: Whitelisted compatible string. Please remove\n", - child->full_name); - return true; - } - - if (!of_find_property(child, "compatible", NULL)) - return true; - - return false; -} - -/** - * of_mdiobus_register - Register mii_bus and create PHYs from the device tree - * @mdio: pointer to mii_bus structure - * @np: pointer to device_node of MDIO bus. - * - * This function registers the mii_bus structure and registers a phy_device - * for each child node of @np. - */ -int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np) -{ - struct device_node *child; - bool scanphys = false; - int addr, rc; - - /* Do not continue if the node is disabled */ - if (!of_device_is_available(np)) - return -ENODEV; - - /* Mask out all PHYs from auto probing. Instead the PHYs listed in - * the device tree are populated after the bus has been registered */ - mdio->phy_mask = ~0; - - mdio->dev.of_node = np; - - /* Get bus level PHY reset GPIO details */ - mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY; - of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us); - - /* Register the MDIO bus */ - rc = mdiobus_register(mdio); - if (rc) - return rc; - - /* Loop over the child nodes and register a phy_device for each phy */ - for_each_available_child_of_node(np, child) { - addr = of_mdio_parse_addr(&mdio->dev, child); - if (addr < 0) { - scanphys = true; - continue; - } - - if (of_mdiobus_child_is_phy(child)) - of_mdiobus_register_phy(mdio, child, addr); - else - of_mdiobus_register_device(mdio, child, addr); - } - - if (!scanphys) - return 0; - - /* auto scan for PHYs with empty reg property */ - for_each_available_child_of_node(np, child) { - /* Skip PHYs with reg property set */ - if (of_find_property(child, "reg", NULL)) - continue; - - for (addr = 0; addr < PHY_MAX_ADDR; addr++) { - /* skip already registered PHYs */ - if (mdiobus_is_registered_device(mdio, addr)) - continue; - - /* be noisy to encourage people to set reg property */ - dev_info(&mdio->dev, "scan phy %s at address %i\n", - child->name, addr); - - if (of_mdiobus_child_is_phy(child)) - of_mdiobus_register_phy(mdio, child, addr); - } - } - - return 0; -} -EXPORT_SYMBOL(of_mdiobus_register); - -/* Helper function for of_phy_find_device */ -static int of_phy_match(struct device *dev, void *phy_np) -{ - return dev->of_node == phy_np; -} - -/** - * of_phy_find_device - Give a PHY node, find the phy_device - * @phy_np: Pointer to the phy's device tree node - * - * If successful, returns a pointer to the phy_device with the embedded - * struct device refcount incremented by one, or NULL on failure. - */ -struct phy_device *of_phy_find_device(struct device_node *phy_np) -{ - struct device *d; - struct mdio_device *mdiodev; - - if (!phy_np) - return NULL; - - d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match); - if (d) { - mdiodev = to_mdio_device(d); - if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) - return to_phy_device(d); - put_device(d); - } - - return NULL; -} -EXPORT_SYMBOL(of_phy_find_device); - -/** - * of_phy_connect - Connect to the phy described in the device tree - * @dev: pointer to net_device claiming the phy - * @phy_np: Pointer to device tree node for the PHY - * @hndlr: Link state callback for the network device - * @flags: flags to pass to the PHY - * @iface: PHY data interface type - * - * If successful, returns a pointer to the phy_device with the embedded - * struct device refcount incremented by one, or NULL on failure. The - * refcount must be dropped by calling phy_disconnect() or phy_detach(). - */ -struct phy_device *of_phy_connect(struct net_device *dev, - struct device_node *phy_np, - void (*hndlr)(struct net_device *), u32 flags, - phy_interface_t iface) -{ - struct phy_device *phy = of_phy_find_device(phy_np); - int ret; - - if (!phy) - return NULL; - - phy->dev_flags = flags; - - ret = phy_connect_direct(dev, phy, hndlr, iface); - - /* refcount is held by phy_connect_direct() on success */ - put_device(&phy->mdio.dev); - - return ret ? NULL : phy; -} -EXPORT_SYMBOL(of_phy_connect); - -/** - * of_phy_get_and_connect - * - Get phy node and connect to the phy described in the device tree - * @dev: pointer to net_device claiming the phy - * @np: Pointer to device tree node for the net_device claiming the phy - * @hndlr: Link state callback for the network device - * - * If successful, returns a pointer to the phy_device with the embedded - * struct device refcount incremented by one, or NULL on failure. The - * refcount must be dropped by calling phy_disconnect() or phy_detach(). - */ -struct phy_device *of_phy_get_and_connect(struct net_device *dev, - struct device_node *np, - void (*hndlr)(struct net_device *)) -{ - phy_interface_t iface; - struct device_node *phy_np; - struct phy_device *phy; - - iface = of_get_phy_mode(np); - if (iface < 0) - return NULL; - - phy_np = of_parse_phandle(np, "phy-handle", 0); - if (!phy_np) - return NULL; - - phy = of_phy_connect(dev, phy_np, hndlr, 0, iface); - - of_node_put(phy_np); - - return phy; -} -EXPORT_SYMBOL(of_phy_get_and_connect); - -/** - * of_phy_attach - Attach to a PHY without starting the state machine - * @dev: pointer to net_device claiming the phy - * @phy_np: Node pointer for the PHY - * @flags: flags to pass to the PHY - * @iface: PHY data interface type - * - * If successful, returns a pointer to the phy_device with the embedded - * struct device refcount incremented by one, or NULL on failure. The - * refcount must be dropped by calling phy_disconnect() or phy_detach(). - */ -struct phy_device *of_phy_attach(struct net_device *dev, - struct device_node *phy_np, u32 flags, - phy_interface_t iface) -{ - struct phy_device *phy = of_phy_find_device(phy_np); - int ret; - - if (!phy) - return NULL; - - ret = phy_attach_direct(dev, phy, flags, iface); - - /* refcount is held by phy_attach_direct() on success */ - put_device(&phy->mdio.dev); - - return ret ? NULL : phy; -} -EXPORT_SYMBOL(of_phy_attach); - -/* - * of_phy_is_fixed_link() and of_phy_register_fixed_link() must - * support two DT bindings: - * - the old DT binding, where 'fixed-link' was a property with 5 - * cells encoding various informations about the fixed PHY - * - the new DT binding, where 'fixed-link' is a sub-node of the - * Ethernet device. - */ -bool of_phy_is_fixed_link(struct device_node *np) -{ - struct device_node *dn; - int len, err; - const char *managed; - - /* New binding */ - dn = of_get_child_by_name(np, "fixed-link"); - if (dn) { - of_node_put(dn); - return true; - } - - err = of_property_read_string(np, "managed", &managed); - if (err == 0 && strcmp(managed, "auto") != 0) - return true; - - /* Old binding */ - if (of_get_property(np, "fixed-link", &len) && - len == (5 * sizeof(__be32))) - return true; - - return false; -} -EXPORT_SYMBOL(of_phy_is_fixed_link); - -int of_phy_register_fixed_link(struct device_node *np) -{ - struct fixed_phy_status status = {}; - struct device_node *fixed_link_node; - const __be32 *fixed_link_prop; - int link_gpio; - int len, err; - struct phy_device *phy; - const char *managed; - - err = of_property_read_string(np, "managed", &managed); - if (err == 0) { - if (strcmp(managed, "in-band-status") == 0) { - /* status is zeroed, namely its .link member */ - phy = fixed_phy_register(PHY_POLL, &status, -1, np); - return PTR_ERR_OR_ZERO(phy); - } - } - - /* New binding */ - fixed_link_node = of_get_child_by_name(np, "fixed-link"); - if (fixed_link_node) { - status.link = 1; - status.duplex = of_property_read_bool(fixed_link_node, - "full-duplex"); - if (of_property_read_u32(fixed_link_node, "speed", - &status.speed)) { - of_node_put(fixed_link_node); - return -EINVAL; - } - status.pause = of_property_read_bool(fixed_link_node, "pause"); - status.asym_pause = of_property_read_bool(fixed_link_node, - "asym-pause"); - link_gpio = of_get_named_gpio_flags(fixed_link_node, - "link-gpios", 0, NULL); - of_node_put(fixed_link_node); - if (link_gpio == -EPROBE_DEFER) - return -EPROBE_DEFER; - - phy = fixed_phy_register(PHY_POLL, &status, link_gpio, np); - return PTR_ERR_OR_ZERO(phy); - } - - /* Old binding */ - fixed_link_prop = of_get_property(np, "fixed-link", &len); - if (fixed_link_prop && len == (5 * sizeof(__be32))) { - status.link = 1; - status.duplex = be32_to_cpu(fixed_link_prop[1]); - status.speed = be32_to_cpu(fixed_link_prop[2]); - status.pause = be32_to_cpu(fixed_link_prop[3]); - status.asym_pause = be32_to_cpu(fixed_link_prop[4]); - phy = fixed_phy_register(PHY_POLL, &status, -1, np); - return PTR_ERR_OR_ZERO(phy); - } - - return -ENODEV; -} -EXPORT_SYMBOL(of_phy_register_fixed_link); - -void of_phy_deregister_fixed_link(struct device_node *np) -{ - struct phy_device *phydev; - - phydev = of_phy_find_device(np); - if (!phydev) - return; - - fixed_phy_unregister(phydev); - - put_device(&phydev->mdio.dev); /* of_phy_find_device() */ - phy_device_free(phydev); /* fixed_phy_register() */ -} -EXPORT_SYMBOL(of_phy_deregister_fixed_link); |