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390 lines
9.1 KiB
390 lines
9.1 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Fixed MDIO bus (MDIO bus emulation with fixed PHYs) |
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* |
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* Author: Vitaly Bordug <[email protected]> |
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* Anton Vorontsov <[email protected]> |
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* |
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* Copyright (c) 2006-2007 MontaVista Software, Inc. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/list.h> |
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#include <linux/mii.h> |
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#include <linux/phy.h> |
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#include <linux/phy_fixed.h> |
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#include <linux/err.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/idr.h> |
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#include <linux/netdevice.h> |
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#include <linux/linkmode.h> |
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#include "swphy.h" |
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struct fixed_mdio_bus { |
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struct mii_bus *mii_bus; |
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struct list_head phys; |
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}; |
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struct fixed_phy { |
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int addr; |
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struct phy_device *phydev; |
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struct fixed_phy_status status; |
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bool no_carrier; |
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int (*link_update)(struct net_device *, struct fixed_phy_status *); |
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struct list_head node; |
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struct gpio_desc *link_gpiod; |
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}; |
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static struct platform_device *pdev; |
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static struct fixed_mdio_bus platform_fmb = { |
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.phys = LIST_HEAD_INIT(platform_fmb.phys), |
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}; |
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int fixed_phy_change_carrier(struct net_device *dev, bool new_carrier) |
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{ |
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struct fixed_mdio_bus *fmb = &platform_fmb; |
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struct phy_device *phydev = dev->phydev; |
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struct fixed_phy *fp; |
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if (!phydev || !phydev->mdio.bus) |
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return -EINVAL; |
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list_for_each_entry(fp, &fmb->phys, node) { |
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if (fp->addr == phydev->mdio.addr) { |
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fp->no_carrier = !new_carrier; |
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return 0; |
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} |
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} |
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return -EINVAL; |
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} |
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EXPORT_SYMBOL_GPL(fixed_phy_change_carrier); |
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static void fixed_phy_update(struct fixed_phy *fp) |
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{ |
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if (!fp->no_carrier && fp->link_gpiod) |
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fp->status.link = !!gpiod_get_value_cansleep(fp->link_gpiod); |
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} |
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static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num) |
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{ |
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struct fixed_mdio_bus *fmb = bus->priv; |
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struct fixed_phy *fp; |
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list_for_each_entry(fp, &fmb->phys, node) { |
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if (fp->addr == phy_addr) { |
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struct fixed_phy_status state; |
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fp->status.link = !fp->no_carrier; |
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/* Issue callback if user registered it. */ |
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if (fp->link_update) |
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fp->link_update(fp->phydev->attached_dev, |
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&fp->status); |
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/* Check the GPIO for change in status */ |
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fixed_phy_update(fp); |
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state = fp->status; |
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return swphy_read_reg(reg_num, &state); |
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} |
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} |
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return 0xFFFF; |
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} |
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static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num, |
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u16 val) |
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{ |
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return 0; |
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} |
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/* |
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* If something weird is required to be done with link/speed, |
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* network driver is able to assign a function to implement this. |
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* May be useful for PHY's that need to be software-driven. |
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*/ |
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int fixed_phy_set_link_update(struct phy_device *phydev, |
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int (*link_update)(struct net_device *, |
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struct fixed_phy_status *)) |
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{ |
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struct fixed_mdio_bus *fmb = &platform_fmb; |
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struct fixed_phy *fp; |
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if (!phydev || !phydev->mdio.bus) |
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return -EINVAL; |
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list_for_each_entry(fp, &fmb->phys, node) { |
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if (fp->addr == phydev->mdio.addr) { |
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fp->link_update = link_update; |
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fp->phydev = phydev; |
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return 0; |
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} |
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} |
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return -ENOENT; |
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} |
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EXPORT_SYMBOL_GPL(fixed_phy_set_link_update); |
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static int fixed_phy_add_gpiod(unsigned int irq, int phy_addr, |
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struct fixed_phy_status *status, |
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struct gpio_desc *gpiod) |
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{ |
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int ret; |
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struct fixed_mdio_bus *fmb = &platform_fmb; |
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struct fixed_phy *fp; |
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ret = swphy_validate_state(status); |
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if (ret < 0) |
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return ret; |
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fp = kzalloc(sizeof(*fp), GFP_KERNEL); |
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if (!fp) |
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return -ENOMEM; |
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if (irq != PHY_POLL) |
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fmb->mii_bus->irq[phy_addr] = irq; |
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fp->addr = phy_addr; |
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fp->status = *status; |
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fp->link_gpiod = gpiod; |
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fixed_phy_update(fp); |
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list_add_tail(&fp->node, &fmb->phys); |
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return 0; |
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} |
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int fixed_phy_add(unsigned int irq, int phy_addr, |
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struct fixed_phy_status *status) { |
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return fixed_phy_add_gpiod(irq, phy_addr, status, NULL); |
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} |
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EXPORT_SYMBOL_GPL(fixed_phy_add); |
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static DEFINE_IDA(phy_fixed_ida); |
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static void fixed_phy_del(int phy_addr) |
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{ |
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struct fixed_mdio_bus *fmb = &platform_fmb; |
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struct fixed_phy *fp, *tmp; |
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list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { |
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if (fp->addr == phy_addr) { |
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list_del(&fp->node); |
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if (fp->link_gpiod) |
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gpiod_put(fp->link_gpiod); |
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kfree(fp); |
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ida_simple_remove(&phy_fixed_ida, phy_addr); |
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return; |
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} |
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} |
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} |
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#ifdef CONFIG_OF_GPIO |
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static struct gpio_desc *fixed_phy_get_gpiod(struct device_node *np) |
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{ |
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struct device_node *fixed_link_node; |
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struct gpio_desc *gpiod; |
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if (!np) |
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return NULL; |
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fixed_link_node = of_get_child_by_name(np, "fixed-link"); |
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if (!fixed_link_node) |
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return NULL; |
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/* |
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* As the fixed link is just a device tree node without any |
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* Linux device associated with it, we simply have obtain |
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* the GPIO descriptor from the device tree like this. |
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*/ |
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gpiod = fwnode_gpiod_get_index(of_fwnode_handle(fixed_link_node), |
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"link", 0, GPIOD_IN, "mdio"); |
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if (IS_ERR(gpiod) && PTR_ERR(gpiod) != -EPROBE_DEFER) { |
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if (PTR_ERR(gpiod) != -ENOENT) |
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pr_err("error getting GPIO for fixed link %pOF, proceed without\n", |
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fixed_link_node); |
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gpiod = NULL; |
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} |
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of_node_put(fixed_link_node); |
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return gpiod; |
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} |
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#else |
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static struct gpio_desc *fixed_phy_get_gpiod(struct device_node *np) |
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{ |
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return NULL; |
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} |
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#endif |
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static struct phy_device *__fixed_phy_register(unsigned int irq, |
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struct fixed_phy_status *status, |
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struct device_node *np, |
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struct gpio_desc *gpiod) |
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{ |
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struct fixed_mdio_bus *fmb = &platform_fmb; |
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struct phy_device *phy; |
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int phy_addr; |
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int ret; |
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if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED) |
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return ERR_PTR(-EPROBE_DEFER); |
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/* Check if we have a GPIO associated with this fixed phy */ |
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if (!gpiod) { |
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gpiod = fixed_phy_get_gpiod(np); |
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if (IS_ERR(gpiod)) |
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return ERR_CAST(gpiod); |
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} |
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/* Get the next available PHY address, up to PHY_MAX_ADDR */ |
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phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL); |
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if (phy_addr < 0) |
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return ERR_PTR(phy_addr); |
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ret = fixed_phy_add_gpiod(irq, phy_addr, status, gpiod); |
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if (ret < 0) { |
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ida_simple_remove(&phy_fixed_ida, phy_addr); |
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return ERR_PTR(ret); |
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} |
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phy = get_phy_device(fmb->mii_bus, phy_addr, false); |
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if (IS_ERR(phy)) { |
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fixed_phy_del(phy_addr); |
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return ERR_PTR(-EINVAL); |
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} |
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/* propagate the fixed link values to struct phy_device */ |
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phy->link = status->link; |
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if (status->link) { |
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phy->speed = status->speed; |
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phy->duplex = status->duplex; |
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phy->pause = status->pause; |
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phy->asym_pause = status->asym_pause; |
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} |
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of_node_get(np); |
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phy->mdio.dev.of_node = np; |
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phy->is_pseudo_fixed_link = true; |
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switch (status->speed) { |
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case SPEED_1000: |
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linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, |
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phy->supported); |
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linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, |
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phy->supported); |
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fallthrough; |
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case SPEED_100: |
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linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, |
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phy->supported); |
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linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, |
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phy->supported); |
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fallthrough; |
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case SPEED_10: |
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default: |
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linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, |
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phy->supported); |
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linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, |
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phy->supported); |
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} |
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phy_advertise_supported(phy); |
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ret = phy_device_register(phy); |
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if (ret) { |
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phy_device_free(phy); |
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of_node_put(np); |
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fixed_phy_del(phy_addr); |
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return ERR_PTR(ret); |
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} |
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return phy; |
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} |
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struct phy_device *fixed_phy_register(unsigned int irq, |
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struct fixed_phy_status *status, |
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struct device_node *np) |
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{ |
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return __fixed_phy_register(irq, status, np, NULL); |
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} |
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EXPORT_SYMBOL_GPL(fixed_phy_register); |
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struct phy_device * |
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fixed_phy_register_with_gpiod(unsigned int irq, |
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struct fixed_phy_status *status, |
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struct gpio_desc *gpiod) |
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{ |
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return __fixed_phy_register(irq, status, NULL, gpiod); |
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} |
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EXPORT_SYMBOL_GPL(fixed_phy_register_with_gpiod); |
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void fixed_phy_unregister(struct phy_device *phy) |
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{ |
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phy_device_remove(phy); |
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of_node_put(phy->mdio.dev.of_node); |
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fixed_phy_del(phy->mdio.addr); |
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} |
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EXPORT_SYMBOL_GPL(fixed_phy_unregister); |
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static int __init fixed_mdio_bus_init(void) |
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{ |
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struct fixed_mdio_bus *fmb = &platform_fmb; |
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int ret; |
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pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0); |
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if (IS_ERR(pdev)) |
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return PTR_ERR(pdev); |
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fmb->mii_bus = mdiobus_alloc(); |
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if (fmb->mii_bus == NULL) { |
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ret = -ENOMEM; |
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goto err_mdiobus_reg; |
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} |
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snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0"); |
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fmb->mii_bus->name = "Fixed MDIO Bus"; |
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fmb->mii_bus->priv = fmb; |
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fmb->mii_bus->parent = &pdev->dev; |
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fmb->mii_bus->read = &fixed_mdio_read; |
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fmb->mii_bus->write = &fixed_mdio_write; |
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ret = mdiobus_register(fmb->mii_bus); |
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if (ret) |
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goto err_mdiobus_alloc; |
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return 0; |
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err_mdiobus_alloc: |
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mdiobus_free(fmb->mii_bus); |
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err_mdiobus_reg: |
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platform_device_unregister(pdev); |
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return ret; |
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} |
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module_init(fixed_mdio_bus_init); |
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static void __exit fixed_mdio_bus_exit(void) |
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{ |
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struct fixed_mdio_bus *fmb = &platform_fmb; |
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struct fixed_phy *fp, *tmp; |
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mdiobus_unregister(fmb->mii_bus); |
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mdiobus_free(fmb->mii_bus); |
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platform_device_unregister(pdev); |
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list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { |
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list_del(&fp->node); |
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kfree(fp); |
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} |
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ida_destroy(&phy_fixed_ida); |
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} |
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module_exit(fixed_mdio_bus_exit); |
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MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)"); |
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MODULE_AUTHOR("Vitaly Bordug"); |
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MODULE_LICENSE("GPL");
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