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1eefee901f
A follow-on patch uses PCI probing to find the Thunder MDIO hardware. In preparation for this, split out the common code into a new file mdio-cavium.c, which will be used by both the existing OCTEON driver, and the new Thunder PCI based driver. As part of the refactoring simplify the struct cavium_mdiobus by removing fields that are only ever used in the probe function and can just as well be local variables. Use readq/writeq in preference to readq_relaxed/writeq_relaxed as the relaxed form was an optimization for an early chip revision, and the MDIO drivers are not performance bottlenecks that need optimization in the first place. Signed-off-by: David Daney <david.daney@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>
126 lines
3.0 KiB
C
126 lines
3.0 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2009-2015 Cavium, Inc.
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*/
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#include <linux/platform_device.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/module.h>
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#include <linux/gfp.h>
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#include <linux/phy.h>
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#include <linux/io.h>
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#include "mdio-cavium.h"
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static int octeon_mdiobus_probe(struct platform_device *pdev)
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{
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struct cavium_mdiobus *bus;
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struct mii_bus *mii_bus;
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struct resource *res_mem;
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resource_size_t mdio_phys;
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resource_size_t regsize;
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union cvmx_smix_en smi_en;
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int err = -ENOENT;
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mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
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if (!mii_bus)
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return -ENOMEM;
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res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res_mem == NULL) {
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dev_err(&pdev->dev, "found no memory resource\n");
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return -ENXIO;
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}
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bus = mii_bus->priv;
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bus->mii_bus = mii_bus;
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mdio_phys = res_mem->start;
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regsize = resource_size(res_mem);
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if (!devm_request_mem_region(&pdev->dev, mdio_phys, regsize,
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res_mem->name)) {
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dev_err(&pdev->dev, "request_mem_region failed\n");
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return -ENXIO;
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}
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bus->register_base =
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(u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
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if (!bus->register_base) {
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dev_err(&pdev->dev, "dev_ioremap failed\n");
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return -ENOMEM;
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}
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smi_en.u64 = 0;
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smi_en.s.en = 1;
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oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
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bus->mii_bus->name = KBUILD_MODNAME;
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snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
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bus->mii_bus->parent = &pdev->dev;
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bus->mii_bus->read = cavium_mdiobus_read;
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bus->mii_bus->write = cavium_mdiobus_write;
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platform_set_drvdata(pdev, bus);
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err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
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if (err)
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goto fail_register;
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dev_info(&pdev->dev, "Probed\n");
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return 0;
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fail_register:
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mdiobus_free(bus->mii_bus);
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smi_en.u64 = 0;
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oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
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return err;
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}
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static int octeon_mdiobus_remove(struct platform_device *pdev)
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{
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struct cavium_mdiobus *bus;
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union cvmx_smix_en smi_en;
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bus = platform_get_drvdata(pdev);
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mdiobus_unregister(bus->mii_bus);
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mdiobus_free(bus->mii_bus);
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smi_en.u64 = 0;
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oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
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return 0;
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}
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static const struct of_device_id octeon_mdiobus_match[] = {
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{
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.compatible = "cavium,octeon-3860-mdio",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
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static struct platform_driver octeon_mdiobus_driver = {
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.driver = {
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.name = KBUILD_MODNAME,
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.of_match_table = octeon_mdiobus_match,
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},
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.probe = octeon_mdiobus_probe,
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.remove = octeon_mdiobus_remove,
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};
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void octeon_mdiobus_force_mod_depencency(void)
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{
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/* Let ethernet drivers force us to be loaded. */
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}
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EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
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module_platform_driver(octeon_mdiobus_driver);
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MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
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MODULE_AUTHOR("David Daney");
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MODULE_LICENSE("GPL");
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