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