312 lines
7 KiB
C
312 lines
7 KiB
C
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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 <vbordug@ru.mvista.com>
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* Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* Copyright (c) 2006-2007 MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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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.h>
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#include <linux/seqlock.h>
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#include <linux/idr.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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seqcount_t seqcount;
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struct fixed_phy_status status;
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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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int link_gpio;
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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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static void fixed_phy_update(struct fixed_phy *fp)
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{
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if (gpio_is_valid(fp->link_gpio))
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fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
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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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int s;
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do {
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s = read_seqcount_begin(&fp->seqcount);
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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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} while (read_seqcount_retry(&fp->seqcount, s));
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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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int fixed_phy_add(unsigned int irq, int phy_addr,
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struct fixed_phy_status *status,
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int link_gpio)
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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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seqcount_init(&fp->seqcount);
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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_gpio = link_gpio;
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if (gpio_is_valid(fp->link_gpio)) {
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ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
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"fixed-link-gpio-link");
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if (ret)
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goto err_regs;
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}
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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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err_regs:
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kfree(fp);
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return ret;
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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 (gpio_is_valid(fp->link_gpio))
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gpio_free(fp->link_gpio);
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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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struct phy_device *fixed_phy_register(unsigned int irq,
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struct fixed_phy_status *status,
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int link_gpio,
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struct device_node *np)
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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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/* 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(irq, phy_addr, status, link_gpio);
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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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phy->supported = PHY_1000BT_FEATURES;
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break;
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case SPEED_100:
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phy->supported = PHY_100BT_FEATURES;
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break;
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case SPEED_10:
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default:
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phy->supported = PHY_10BT_FEATURES;
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}
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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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EXPORT_SYMBOL_GPL(fixed_phy_register);
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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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