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7111b717a0
This patch changes the mvmdio driver not to use device tree helper functions such as of_mdiobus_register() and of_iomap() so we can instantiate this driver using a classic platform_device approach. Use the device manager helper to ioremap() the base register cookie so we get automatic freeing upon error and removal. This change is harmless for Device Tree platforms because they will get the driver be registered the same way as it was before. Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: David S. Miller <davem@davemloft.net>
235 lines
5.3 KiB
C
235 lines
5.3 KiB
C
/*
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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/platform_device.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/of_mdio.h>
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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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/* 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 orion_mdio_probe(struct platform_device *pdev)
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{
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struct resource *r;
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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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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r) {
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dev_err(&pdev->dev, "No SMI register address given\n");
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return -ENODEV;
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}
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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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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 = devm_ioremap(&pdev->dev, r->start, resource_size(r));
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if (!dev->smireg) {
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dev_err(&pdev->dev, "Unable to remap SMI register\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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if (pdev->dev.of_node)
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ret = of_mdiobus_register(bus, pdev->dev.of_node);
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else
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ret = mdiobus_register(bus);
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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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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 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 = 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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