mdio-octeon.c 4.0 KB
Newer Older
1 2 3 4 5 6 7 8
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2009 Cavium Networks
 */

9
#include <linux/gfp.h>
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/phy.h>

#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-smix-defs.h>

#define DRV_VERSION "1.0"
#define DRV_DESCRIPTION "Cavium Networks Octeon SMI/MDIO driver"

struct octeon_mdiobus {
	struct mii_bus *mii_bus;
	int unit;
	int phy_irq[PHY_MAX_ADDR];
};

static int octeon_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
{
	struct octeon_mdiobus *p = bus->priv;
	union cvmx_smix_cmd smi_cmd;
	union cvmx_smix_rd_dat smi_rd;
	int timeout = 1000;

	smi_cmd.u64 = 0;
	smi_cmd.s.phy_op = 1; /* MDIO_CLAUSE_22_READ */
	smi_cmd.s.phy_adr = phy_id;
	smi_cmd.s.reg_adr = regnum;
	cvmx_write_csr(CVMX_SMIX_CMD(p->unit), smi_cmd.u64);

	do {
		/*
		 * Wait 1000 clocks so we don't saturate the RSL bus
		 * doing reads.
		 */
		cvmx_wait(1000);
		smi_rd.u64 = cvmx_read_csr(CVMX_SMIX_RD_DAT(p->unit));
	} while (smi_rd.s.pending && --timeout);

	if (smi_rd.s.val)
		return smi_rd.s.dat;
	else
		return -EIO;
}

static int octeon_mdiobus_write(struct mii_bus *bus, int phy_id,
				int regnum, u16 val)
{
	struct octeon_mdiobus *p = bus->priv;
	union cvmx_smix_cmd smi_cmd;
	union cvmx_smix_wr_dat smi_wr;
	int timeout = 1000;

	smi_wr.u64 = 0;
	smi_wr.s.dat = val;
	cvmx_write_csr(CVMX_SMIX_WR_DAT(p->unit), smi_wr.u64);

	smi_cmd.u64 = 0;
	smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_22_WRITE */
	smi_cmd.s.phy_adr = phy_id;
	smi_cmd.s.reg_adr = regnum;
	cvmx_write_csr(CVMX_SMIX_CMD(p->unit), smi_cmd.u64);

	do {
		/*
		 * Wait 1000 clocks so we don't saturate the RSL bus
		 * doing reads.
		 */
		cvmx_wait(1000);
		smi_wr.u64 = cvmx_read_csr(CVMX_SMIX_WR_DAT(p->unit));
	} while (smi_wr.s.pending && --timeout);

	if (timeout <= 0)
		return -EIO;

	return 0;
}

static int __init octeon_mdiobus_probe(struct platform_device *pdev)
{
	struct octeon_mdiobus *bus;
	int i;
	int err = -ENOENT;

	bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
	if (!bus)
		return -ENOMEM;

	/* The platform_device id is our unit number.  */
	bus->unit = pdev->id;

	bus->mii_bus = mdiobus_alloc();

	if (!bus->mii_bus)
		goto err;

	/*
	 * Standard Octeon evaluation boards don't support phy
	 * interrupts, we need to poll.
	 */
	for (i = 0; i < PHY_MAX_ADDR; i++)
		bus->phy_irq[i] = PHY_POLL;

	bus->mii_bus->priv = bus;
	bus->mii_bus->irq = bus->phy_irq;
	bus->mii_bus->name = "mdio-octeon";
	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%x", bus->unit);
	bus->mii_bus->parent = &pdev->dev;

	bus->mii_bus->read = octeon_mdiobus_read;
	bus->mii_bus->write = octeon_mdiobus_write;

	dev_set_drvdata(&pdev->dev, bus);

	err = mdiobus_register(bus->mii_bus);
	if (err)
		goto err_register;

	dev_info(&pdev->dev, "Version " DRV_VERSION "\n");

	return 0;
err_register:
	mdiobus_free(bus->mii_bus);

err:
	devm_kfree(&pdev->dev, bus);
	return err;
}

static int __exit octeon_mdiobus_remove(struct platform_device *pdev)
{
	struct octeon_mdiobus *bus;

	bus = dev_get_drvdata(&pdev->dev);

	mdiobus_unregister(bus->mii_bus);
	mdiobus_free(bus->mii_bus);
	return 0;
}

static struct platform_driver octeon_mdiobus_driver = {
	.driver = {
		.name		= "mdio-octeon",
		.owner		= THIS_MODULE,
	},
	.probe		= octeon_mdiobus_probe,
	.remove		= __exit_p(octeon_mdiobus_remove),
};

void octeon_mdiobus_force_mod_depencency(void)
{
	/* Let ethernet drivers force us to be loaded.  */
}
EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);

static int __init octeon_mdiobus_mod_init(void)
{
	return platform_driver_register(&octeon_mdiobus_driver);
}

static void __exit octeon_mdiobus_mod_exit(void)
{
	platform_driver_unregister(&octeon_mdiobus_driver);
}

module_init(octeon_mdiobus_mod_init);
module_exit(octeon_mdiobus_mod_exit);

MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR("David Daney");
MODULE_LICENSE("GPL");