2012-11-12 16:03:47 +00:00
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/*
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* Driver for the MDIO interface of Marvell network interfaces.
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*
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* Since the MDIO interface of Marvell network interfaces is shared
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* between all network interfaces, having a single driver allows to
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* handle concurrent accesses properly (you may have four Ethernet
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* ports, but they in fact share the same SMI interface to access the
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* MDIO bus). Moreover, this MDIO interface code is similar between
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* the mv643xx_eth driver and the mvneta driver. For now, it is only
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* used by the mvneta driver, but it could later be used by the
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* mv643xx_eth driver as well.
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*
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* Copyright (C) 2012 Marvell
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*
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* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/phy.h>
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#include <linux/of_address.h>
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#include <linux/of_mdio.h>
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#include <linux/platform_device.h>
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2012-11-19 10:39:42 +00:00
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#include <linux/delay.h>
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2012-11-12 16:03:47 +00:00
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#define MVMDIO_SMI_DATA_SHIFT 0
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#define MVMDIO_SMI_PHY_ADDR_SHIFT 16
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#define MVMDIO_SMI_PHY_REG_SHIFT 21
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#define MVMDIO_SMI_READ_OPERATION BIT(26)
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#define MVMDIO_SMI_WRITE_OPERATION 0
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#define MVMDIO_SMI_READ_VALID BIT(27)
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#define MVMDIO_SMI_BUSY BIT(28)
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struct orion_mdio_dev {
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struct mutex lock;
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void __iomem *smireg;
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};
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/*
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* Wait for the SMI unit to be ready for another operation
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*/
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static int orion_mdio_wait_ready(struct mii_bus *bus)
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{
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struct orion_mdio_dev *dev = bus->priv;
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int count;
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u32 val;
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count = 0;
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while (1) {
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val = readl(dev->smireg);
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if (!(val & MVMDIO_SMI_BUSY))
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break;
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if (count > 100) {
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dev_err(bus->parent, "Timeout: SMI busy for too long\n");
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return -ETIMEDOUT;
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}
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udelay(10);
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count++;
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}
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return 0;
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}
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static int orion_mdio_read(struct mii_bus *bus, int mii_id,
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int regnum)
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{
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struct orion_mdio_dev *dev = bus->priv;
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int count;
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u32 val;
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int ret;
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mutex_lock(&dev->lock);
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ret = orion_mdio_wait_ready(bus);
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if (ret < 0) {
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mutex_unlock(&dev->lock);
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return ret;
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}
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writel(((mii_id << MVMDIO_SMI_PHY_ADDR_SHIFT) |
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(regnum << MVMDIO_SMI_PHY_REG_SHIFT) |
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MVMDIO_SMI_READ_OPERATION),
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dev->smireg);
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/* Wait for the value to become available */
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count = 0;
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while (1) {
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val = readl(dev->smireg);
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if (val & MVMDIO_SMI_READ_VALID)
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break;
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if (count > 100) {
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dev_err(bus->parent, "Timeout when reading PHY\n");
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mutex_unlock(&dev->lock);
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return -ETIMEDOUT;
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}
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udelay(10);
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count++;
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}
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mutex_unlock(&dev->lock);
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return val & 0xFFFF;
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}
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static int orion_mdio_write(struct mii_bus *bus, int mii_id,
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int regnum, u16 value)
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{
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struct orion_mdio_dev *dev = bus->priv;
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int ret;
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mutex_lock(&dev->lock);
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ret = orion_mdio_wait_ready(bus);
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if (ret < 0) {
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mutex_unlock(&dev->lock);
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return ret;
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}
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writel(((mii_id << MVMDIO_SMI_PHY_ADDR_SHIFT) |
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(regnum << MVMDIO_SMI_PHY_REG_SHIFT) |
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MVMDIO_SMI_WRITE_OPERATION |
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(value << MVMDIO_SMI_DATA_SHIFT)),
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dev->smireg);
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mutex_unlock(&dev->lock);
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return 0;
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}
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static int orion_mdio_reset(struct mii_bus *bus)
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{
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return 0;
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}
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static int __devinit orion_mdio_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct mii_bus *bus;
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struct orion_mdio_dev *dev;
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int i, ret;
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bus = mdiobus_alloc_size(sizeof(struct orion_mdio_dev));
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if (!bus) {
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dev_err(&pdev->dev, "Cannot allocate MDIO bus\n");
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return -ENOMEM;
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}
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bus->name = "orion_mdio_bus";
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bus->read = orion_mdio_read;
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bus->write = orion_mdio_write;
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bus->reset = orion_mdio_reset;
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snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii",
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dev_name(&pdev->dev));
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bus->parent = &pdev->dev;
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bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
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if (!bus->irq) {
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dev_err(&pdev->dev, "Cannot allocate PHY IRQ array\n");
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mdiobus_free(bus);
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return -ENOMEM;
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}
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for (i = 0; i < PHY_MAX_ADDR; i++)
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bus->irq[i] = PHY_POLL;
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dev = bus->priv;
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dev->smireg = of_iomap(pdev->dev.of_node, 0);
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if (!dev->smireg) {
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dev_err(&pdev->dev, "No SMI register address given in DT\n");
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kfree(bus->irq);
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mdiobus_free(bus);
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return -ENODEV;
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}
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mutex_init(&dev->lock);
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ret = of_mdiobus_register(bus, np);
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if (ret < 0) {
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dev_err(&pdev->dev, "Cannot register MDIO bus (%d)\n", ret);
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iounmap(dev->smireg);
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kfree(bus->irq);
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mdiobus_free(bus);
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return ret;
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}
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platform_set_drvdata(pdev, bus);
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return 0;
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}
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static int __devexit orion_mdio_remove(struct platform_device *pdev)
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{
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struct mii_bus *bus = platform_get_drvdata(pdev);
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mdiobus_unregister(bus);
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kfree(bus->irq);
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mdiobus_free(bus);
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return 0;
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}
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static const struct of_device_id orion_mdio_match[] = {
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{ .compatible = "marvell,orion-mdio" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, orion_mdio_match);
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static struct platform_driver orion_mdio_driver = {
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.probe = orion_mdio_probe,
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.remove = __devexit_p(orion_mdio_remove),
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.driver = {
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.name = "orion-mdio",
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.of_match_table = orion_mdio_match,
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},
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};
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module_platform_driver(orion_mdio_driver);
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MODULE_DESCRIPTION("Marvell MDIO interface driver");
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MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
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MODULE_LICENSE("GPL");
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