drivers/net/phy/mdio-octeon.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2009 Cavium Networks
   7  */
   8
   9 #include <linux/gfp.h>
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/phy.h>
  14
  15 #include <asm/octeon/octeon.h>
  16 #include <asm/octeon/cvmx-smix-defs.h>
  17
  18 #define DRV_VERSION "1.0"
  19 #define DRV_DESCRIPTION "Cavium Networks Octeon SMI/MDIO driver"
  20
  21 struct octeon_mdiobus {
  22         struct mii_bus *mii_bus;
  23         int unit;
  24         int phy_irq[PHY_MAX_ADDR];
  25 };
  26
  27 static int octeon_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
  28 {
  29         struct octeon_mdiobus *p = bus->priv;
  30         union cvmx_smix_cmd smi_cmd;
  31         union cvmx_smix_rd_dat smi_rd;
  32         int timeout = 1000;
  33
  34         smi_cmd.u64 = 0;
  35         smi_cmd.s.phy_op = 1; /* MDIO_CLAUSE_22_READ */
  36         smi_cmd.s.phy_adr = phy_id;
  37         smi_cmd.s.reg_adr = regnum;
  38         cvmx_write_csr(CVMX_SMIX_CMD(p->unit), smi_cmd.u64);
  39
  40         do {
  41                 /*
  42                  * Wait 1000 clocks so we don't saturate the RSL bus
  43                  * doing reads.
  44                  */
  45                 cvmx_wait(1000);
  46                 smi_rd.u64 = cvmx_read_csr(CVMX_SMIX_RD_DAT(p->unit));
  47         } while (smi_rd.s.pending && --timeout);
  48
  49         if (smi_rd.s.val)
  50                 return smi_rd.s.dat;
  51         else
  52                 return -EIO;
  53 }
  54
  55 static int octeon_mdiobus_write(struct mii_bus *bus, int phy_id,
  56                                 int regnum, u16 val)
  57 {
  58         struct octeon_mdiobus *p = bus->priv;
  59         union cvmx_smix_cmd smi_cmd;
  60         union cvmx_smix_wr_dat smi_wr;
  61         int timeout = 1000;
  62
  63         smi_wr.u64 = 0;
  64         smi_wr.s.dat = val;
  65         cvmx_write_csr(CVMX_SMIX_WR_DAT(p->unit), smi_wr.u64);
  66
  67         smi_cmd.u64 = 0;
  68         smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_22_WRITE */
  69         smi_cmd.s.phy_adr = phy_id;
  70         smi_cmd.s.reg_adr = regnum;
  71         cvmx_write_csr(CVMX_SMIX_CMD(p->unit), smi_cmd.u64);
  72
  73         do {
  74                 /*
  75                  * Wait 1000 clocks so we don't saturate the RSL bus
  76                  * doing reads.
  77                  */
  78                 cvmx_wait(1000);
  79                 smi_wr.u64 = cvmx_read_csr(CVMX_SMIX_WR_DAT(p->unit));
  80         } while (smi_wr.s.pending && --timeout);
  81
  82         if (timeout <= 0)
  83                 return -EIO;
  84
  85         return 0;
  86 }
  87
  88 static int __devinit octeon_mdiobus_probe(struct platform_device *pdev)
  89 {
  90         struct octeon_mdiobus *bus;
  91         union cvmx_smix_en smi_en;
  92         int i;
  93         int err = -ENOENT;
  94
  95         bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
  96         if (!bus)
  97                 return -ENOMEM;
  98
  99         /* The platform_device id is our unit number.  */
 100         bus->unit = pdev->id;
 101
 102         bus->mii_bus = mdiobus_alloc();
 103
 104         if (!bus->mii_bus)
 105                 goto err;
 106
 107         smi_en.u64 = 0;
 108         smi_en.s.en = 1;
 109         cvmx_write_csr(CVMX_SMIX_EN(bus->unit), smi_en.u64);
 110
 111         /*
 112          * Standard Octeon evaluation boards don't support phy
 113          * interrupts, we need to poll.
 114          */
 115         for (i = 0; i < PHY_MAX_ADDR; i++)
 116                 bus->phy_irq[i] = PHY_POLL;
 117
 118         bus->mii_bus->priv = bus;
 119         bus->mii_bus->irq = bus->phy_irq;
 120         bus->mii_bus->name = "mdio-octeon";
 121         snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
 122                 bus->mii_bus->name, bus->unit);
 123         bus->mii_bus->parent = &pdev->dev;
 124
 125         bus->mii_bus->read = octeon_mdiobus_read;
 126         bus->mii_bus->write = octeon_mdiobus_write;
 127
 128         dev_set_drvdata(&pdev->dev, bus);
 129
 130         err = mdiobus_register(bus->mii_bus);
 131         if (err)
 132                 goto err_register;
 133
 134         dev_info(&pdev->dev, "Version " DRV_VERSION "\n");
 135
 136         return 0;
 137 err_register:
 138         mdiobus_free(bus->mii_bus);
 139
 140 err:
 141         devm_kfree(&pdev->dev, bus);
 142         smi_en.u64 = 0;
 143         cvmx_write_csr(CVMX_SMIX_EN(bus->unit), smi_en.u64);
 144         return err;
 145 }
 146
 147 static int __devexit octeon_mdiobus_remove(struct platform_device *pdev)
 148 {
 149         struct octeon_mdiobus *bus;
 150         union cvmx_smix_en smi_en;
 151
 152         bus = dev_get_drvdata(&pdev->dev);
 153
 154         mdiobus_unregister(bus->mii_bus);
 155         mdiobus_free(bus->mii_bus);
 156         smi_en.u64 = 0;
 157         cvmx_write_csr(CVMX_SMIX_EN(bus->unit), smi_en.u64);
 158         return 0;
 159 }
 160
 161 static struct platform_driver octeon_mdiobus_driver = {
 162         .driver = {
 163                 .name           = "mdio-octeon",
 164                 .owner          = THIS_MODULE,
 165         },
 166         .probe          = octeon_mdiobus_probe,
 167         .remove         = __devexit_p(octeon_mdiobus_remove),
 168 };
 169
 170 void octeon_mdiobus_force_mod_depencency(void)
 171 {
 172         /* Let ethernet drivers force us to be loaded.  */
 173 }
 174 EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
 175
 176 static int __init octeon_mdiobus_mod_init(void)
 177 {
 178         return platform_driver_register(&octeon_mdiobus_driver);
 179 }
 180
 181 static void __exit octeon_mdiobus_mod_exit(void)
 182 {
 183         platform_driver_unregister(&octeon_mdiobus_driver);
 184 }
 185
 186 module_init(octeon_mdiobus_mod_init);
 187 module_exit(octeon_mdiobus_mod_exit);
 188
 189 MODULE_DESCRIPTION(DRV_DESCRIPTION);
 190 MODULE_VERSION(DRV_VERSION);
 191 MODULE_AUTHOR("David Daney");
 192 MODULE_LICENSE("GPL");