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) 2009-2012 Cavium, Inc.
   7  */
   8
   9 #include <linux/platform_device.h>
  10 #include <linux/of_mdio.h>
  11 #include <linux/delay.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/gfp.h>
  15 #include <linux/phy.h>
  16 #include <linux/io.h>
  17
  18 #include <asm/octeon/octeon.h>
  19 #include <asm/octeon/cvmx-smix-defs.h>
  20
  21 #define DRV_VERSION "1.0"
  22 #define DRV_DESCRIPTION "Cavium Networks Octeon SMI/MDIO driver"
  23
  24 #define SMI_CMD         0x0
  25 #define SMI_WR_DAT      0x8
  26 #define SMI_RD_DAT      0x10
  27 #define SMI_CLK         0x18
  28 #define SMI_EN          0x20
  29
  30 enum octeon_mdiobus_mode {
  31         UNINIT = 0,
  32         C22,
  33         C45
  34 };
  35
  36 struct octeon_mdiobus {
  37         struct mii_bus *mii_bus;
  38         u64 register_base;
  39         resource_size_t mdio_phys;
  40         resource_size_t regsize;
  41         enum octeon_mdiobus_mode mode;
  42         int phy_irq[PHY_MAX_ADDR];
  43 };
  44
  45 static void octeon_mdiobus_set_mode(struct octeon_mdiobus *p,
  46                                     enum octeon_mdiobus_mode m)
  47 {
  48         union cvmx_smix_clk smi_clk;
  49
  50         if (m == p->mode)
  51                 return;
  52
  53         smi_clk.u64 = cvmx_read_csr(p->register_base + SMI_CLK);
  54         smi_clk.s.mode = (m == C45) ? 1 : 0;
  55         smi_clk.s.preamble = 1;
  56         cvmx_write_csr(p->register_base + SMI_CLK, smi_clk.u64);
  57         p->mode = m;
  58 }
  59
  60 static int octeon_mdiobus_c45_addr(struct octeon_mdiobus *p,
  61                                    int phy_id, int regnum)
  62 {
  63         union cvmx_smix_cmd smi_cmd;
  64         union cvmx_smix_wr_dat smi_wr;
  65         int timeout = 1000;
  66
  67         octeon_mdiobus_set_mode(p, C45);
  68
  69         smi_wr.u64 = 0;
  70         smi_wr.s.dat = regnum & 0xffff;
  71         cvmx_write_csr(p->register_base + SMI_WR_DAT, smi_wr.u64);
  72
  73         regnum = (regnum >> 16) & 0x1f;
  74
  75         smi_cmd.u64 = 0;
  76         smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_45_ADDRESS */
  77         smi_cmd.s.phy_adr = phy_id;
  78         smi_cmd.s.reg_adr = regnum;
  79         cvmx_write_csr(p->register_base + SMI_CMD, smi_cmd.u64);
  80
  81         do {
  82                 /* Wait 1000 clocks so we don't saturate the RSL bus
  83                  * doing reads.
  84                  */
  85                 __delay(1000);
  86                 smi_wr.u64 = cvmx_read_csr(p->register_base + SMI_WR_DAT);
  87         } while (smi_wr.s.pending && --timeout);
  88
  89         if (timeout <= 0)
  90                 return -EIO;
  91         return 0;
  92 }
  93
  94 static int octeon_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
  95 {
  96         struct octeon_mdiobus *p = bus->priv;
  97         union cvmx_smix_cmd smi_cmd;
  98         union cvmx_smix_rd_dat smi_rd;
  99         unsigned int op = 1; /* MDIO_CLAUSE_22_READ */
 100         int timeout = 1000;
 101
 102         if (regnum & MII_ADDR_C45) {
 103                 int r = octeon_mdiobus_c45_addr(p, phy_id, regnum);
 104                 if (r < 0)
 105                         return r;
 106
 107                 regnum = (regnum >> 16) & 0x1f;
 108                 op = 3; /* MDIO_CLAUSE_45_READ */
 109         } else {
 110                 octeon_mdiobus_set_mode(p, C22);
 111         }
 112
 113
 114         smi_cmd.u64 = 0;
 115         smi_cmd.s.phy_op = op;
 116         smi_cmd.s.phy_adr = phy_id;
 117         smi_cmd.s.reg_adr = regnum;
 118         cvmx_write_csr(p->register_base + SMI_CMD, smi_cmd.u64);
 119
 120         do {
 121                 /* Wait 1000 clocks so we don't saturate the RSL bus
 122                  * doing reads.
 123                  */
 124                 __delay(1000);
 125                 smi_rd.u64 = cvmx_read_csr(p->register_base + SMI_RD_DAT);
 126         } while (smi_rd.s.pending && --timeout);
 127
 128         if (smi_rd.s.val)
 129                 return smi_rd.s.dat;
 130         else
 131                 return -EIO;
 132 }
 133
 134 static int octeon_mdiobus_write(struct mii_bus *bus, int phy_id,
 135                                 int regnum, u16 val)
 136 {
 137         struct octeon_mdiobus *p = bus->priv;
 138         union cvmx_smix_cmd smi_cmd;
 139         union cvmx_smix_wr_dat smi_wr;
 140         unsigned int op = 0; /* MDIO_CLAUSE_22_WRITE */
 141         int timeout = 1000;
 142
 143
 144         if (regnum & MII_ADDR_C45) {
 145                 int r = octeon_mdiobus_c45_addr(p, phy_id, regnum);
 146                 if (r < 0)
 147                         return r;
 148
 149                 regnum = (regnum >> 16) & 0x1f;
 150                 op = 1; /* MDIO_CLAUSE_45_WRITE */
 151         } else {
 152                 octeon_mdiobus_set_mode(p, C22);
 153         }
 154
 155         smi_wr.u64 = 0;
 156         smi_wr.s.dat = val;
 157         cvmx_write_csr(p->register_base + SMI_WR_DAT, smi_wr.u64);
 158
 159         smi_cmd.u64 = 0;
 160         smi_cmd.s.phy_op = op;
 161         smi_cmd.s.phy_adr = phy_id;
 162         smi_cmd.s.reg_adr = regnum;
 163         cvmx_write_csr(p->register_base + SMI_CMD, smi_cmd.u64);
 164
 165         do {
 166                 /* Wait 1000 clocks so we don't saturate the RSL bus
 167                  * doing reads.
 168                  */
 169                 __delay(1000);
 170                 smi_wr.u64 = cvmx_read_csr(p->register_base + SMI_WR_DAT);
 171         } while (smi_wr.s.pending && --timeout);
 172
 173         if (timeout <= 0)
 174                 return -EIO;
 175
 176         return 0;
 177 }
 178
 179 static int octeon_mdiobus_probe(struct platform_device *pdev)
 180 {
 181         struct octeon_mdiobus *bus;
 182         struct resource *res_mem;
 183         union cvmx_smix_en smi_en;
 184         int err = -ENOENT;
 185
 186         bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
 187         if (!bus)
 188                 return -ENOMEM;
 189
 190         res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 191
 192         if (res_mem == NULL) {
 193                 dev_err(&pdev->dev, "found no memory resource\n");
 194                 err = -ENXIO;
 195                 goto fail;
 196         }
 197         bus->mdio_phys = res_mem->start;
 198         bus->regsize = resource_size(res_mem);
 199         if (!devm_request_mem_region(&pdev->dev, bus->mdio_phys, bus->regsize,
 200                                      res_mem->name)) {
 201                 dev_err(&pdev->dev, "request_mem_region failed\n");
 202                 goto fail;
 203         }
 204         bus->register_base =
 205                 (u64)devm_ioremap(&pdev->dev, bus->mdio_phys, bus->regsize);
 206
 207         bus->mii_bus = mdiobus_alloc();
 208
 209         if (!bus->mii_bus)
 210                 goto fail;
 211
 212         smi_en.u64 = 0;
 213         smi_en.s.en = 1;
 214         cvmx_write_csr(bus->register_base + SMI_EN, smi_en.u64);
 215
 216         bus->mii_bus->priv = bus;
 217         bus->mii_bus->irq = bus->phy_irq;
 218         bus->mii_bus->name = "mdio-octeon";
 219         snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
 220         bus->mii_bus->parent = &pdev->dev;
 221
 222         bus->mii_bus->read = octeon_mdiobus_read;
 223         bus->mii_bus->write = octeon_mdiobus_write;
 224
 225         platform_set_drvdata(pdev, bus);
 226
 227         err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
 228         if (err)
 229                 goto fail_register;
 230
 231         dev_info(&pdev->dev, "Version " DRV_VERSION "\n");
 232
 233         return 0;
 234 fail_register:
 235         mdiobus_free(bus->mii_bus);
 236 fail:
 237         smi_en.u64 = 0;
 238         cvmx_write_csr(bus->register_base + SMI_EN, smi_en.u64);
 239         return err;
 240 }
 241
 242 static int octeon_mdiobus_remove(struct platform_device *pdev)
 243 {
 244         struct octeon_mdiobus *bus;
 245         union cvmx_smix_en smi_en;
 246
 247         bus = platform_get_drvdata(pdev);
 248
 249         mdiobus_unregister(bus->mii_bus);
 250         mdiobus_free(bus->mii_bus);
 251         smi_en.u64 = 0;
 252         cvmx_write_csr(bus->register_base + SMI_EN, smi_en.u64);
 253         return 0;
 254 }
 255
 256 static struct of_device_id octeon_mdiobus_match[] = {
 257         {
 258                 .compatible = "cavium,octeon-3860-mdio",
 259         },
 260         {},
 261 };
 262 MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
 263
 264 static struct platform_driver octeon_mdiobus_driver = {
 265         .driver = {
 266                 .name           = "mdio-octeon",
 267                 .owner          = THIS_MODULE,
 268                 .of_match_table = octeon_mdiobus_match,
 269         },
 270         .probe          = octeon_mdiobus_probe,
 271         .remove         = octeon_mdiobus_remove,
 272 };
 273
 274 void octeon_mdiobus_force_mod_depencency(void)
 275 {
 276         /* Let ethernet drivers force us to be loaded.  */
 277 }
 278 EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
 279
 280 module_platform_driver(octeon_mdiobus_driver);
 281
 282 MODULE_DESCRIPTION(DRV_DESCRIPTION);
 283 MODULE_VERSION(DRV_VERSION);
 284 MODULE_AUTHOR("David Daney");
 285 MODULE_LICENSE("GPL");