text: /*
   * 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
   */
  
  #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>
  #include <asm/octeon/ctc5010.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;
  	union cvmx_smix_en smi_en;
  	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;
  	BUG_ON(bus->unit > 1 || bus->unit < 0);
  
  	bus->mii_bus = mdiobus_alloc();
  
  	if (!bus->mii_bus)
  		goto err;
  
  	smi_en.u64 = 0;
  	smi_en.s.en = 1;
  	cvmx_write_csr(CVMX_SMIX_EN(bus->unit), smi_en.u64);
  
  	/*
  	 * 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;
      if(!ctc_board_is_e330_48T())
      {
          bus->mii_bus->phy_mask = 0x1;
      }
  	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");
  
  	octeon_mdiobuses[bus->unit] = bus->mii_bus;
  
  	return 0;
  err_register:
  	mdiobus_free(bus->mii_bus);
  
  err:
  	devm_kfree(&pdev->dev, bus);
  	smi_en.u64 = 0;
  	cvmx_write_csr(CVMX_SMIX_EN(bus->unit), smi_en.u64);
  	return err;
  }
  
  static int __exit octeon_mdiobus_remove(struct platform_device *pdev)
  {
  	struct octeon_mdiobus *bus;
  	union cvmx_smix_en smi_en;
  
  	bus = dev_get_drvdata(&pdev->dev);
  	octeon_mdiobuses[bus->unit] = NULL;
  
  	mdiobus_unregister(bus->mii_bus);
  	mdiobus_free(bus->mii_bus);
  	smi_en.u64 = 0;
  	cvmx_write_csr(CVMX_SMIX_EN(bus->unit), smi_en.u64);
  	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");
  