drivers/net/phy/mdio-xgene.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Applied Micro X-Gene SoC MDIO Driver
   3  *
   4  * Copyright (c) 2016, Applied Micro Circuits Corporation
   5  * Author: Iyappan Subramanian <isubramanian@apm.com>
   6  */
   7
   8 #include <linux/acpi.h>
   9 #include <linux/clk.h>
  10 #include <linux/device.h>
  11 #include <linux/efi.h>
  12 #include <linux/if_vlan.h>
  13 #include <linux/io.h>
  14 #include <linux/module.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/of_net.h>
  17 #include <linux/of_mdio.h>
  18 #include <linux/prefetch.h>
  19 #include <linux/phy.h>
  20 #include <net/ip.h>
  21 #include "mdio-xgene.h"
  22
  23 static bool xgene_mdio_status;
  24
  25 u32 xgene_mdio_rd_mac(struct xgene_mdio_pdata *pdata, u32 rd_addr)
  26 {
  27         void __iomem *addr, *rd, *cmd, *cmd_done;
  28         u32 done, rd_data = BUSY_MASK;
  29         u8 wait = 10;
  30
  31         addr = pdata->mac_csr_addr + MAC_ADDR_REG_OFFSET;
  32         rd = pdata->mac_csr_addr + MAC_READ_REG_OFFSET;
  33         cmd = pdata->mac_csr_addr + MAC_COMMAND_REG_OFFSET;
  34         cmd_done = pdata->mac_csr_addr + MAC_COMMAND_DONE_REG_OFFSET;
  35
  36         spin_lock(&pdata->mac_lock);
  37         iowrite32(rd_addr, addr);
  38         iowrite32(XGENE_ENET_RD_CMD, cmd);
  39
  40         while (!(done = ioread32(cmd_done)) && wait--)
  41                 udelay(1);
  42
  43         if (done)
  44                 rd_data = ioread32(rd);
  45
  46         iowrite32(0, cmd);
  47         spin_unlock(&pdata->mac_lock);
  48
  49         return rd_data;
  50 }
  51 EXPORT_SYMBOL(xgene_mdio_rd_mac);
  52
  53 void xgene_mdio_wr_mac(struct xgene_mdio_pdata *pdata, u32 wr_addr, u32 data)
  54 {
  55         void __iomem *addr, *wr, *cmd, *cmd_done;
  56         u8 wait = 10;
  57         u32 done;
  58
  59         addr = pdata->mac_csr_addr + MAC_ADDR_REG_OFFSET;
  60         wr = pdata->mac_csr_addr + MAC_WRITE_REG_OFFSET;
  61         cmd = pdata->mac_csr_addr + MAC_COMMAND_REG_OFFSET;
  62         cmd_done = pdata->mac_csr_addr + MAC_COMMAND_DONE_REG_OFFSET;
  63
  64         spin_lock(&pdata->mac_lock);
  65         iowrite32(wr_addr, addr);
  66         iowrite32(data, wr);
  67         iowrite32(XGENE_ENET_WR_CMD, cmd);
  68
  69         while (!(done = ioread32(cmd_done)) && wait--)
  70                 udelay(1);
  71
  72         if (!done)
  73                 pr_err("MCX mac write failed, addr: 0x%04x\n", wr_addr);
  74
  75         iowrite32(0, cmd);
  76         spin_unlock(&pdata->mac_lock);
  77 }
  78 EXPORT_SYMBOL(xgene_mdio_wr_mac);
  79
  80 int xgene_mdio_rgmii_read(struct mii_bus *bus, int phy_id, int reg)
  81 {
  82         struct xgene_mdio_pdata *pdata = (struct xgene_mdio_pdata *)bus->priv;
  83         u32 data, done;
  84         u8 wait = 10;
  85
  86         data = SET_VAL(PHY_ADDR, phy_id) | SET_VAL(REG_ADDR, reg);
  87         xgene_mdio_wr_mac(pdata, MII_MGMT_ADDRESS_ADDR, data);
  88         xgene_mdio_wr_mac(pdata, MII_MGMT_COMMAND_ADDR, READ_CYCLE_MASK);
  89         do {
  90                 usleep_range(5, 10);
  91                 done = xgene_mdio_rd_mac(pdata, MII_MGMT_INDICATORS_ADDR);
  92         } while ((done & BUSY_MASK) && wait--);
  93
  94         if (done & BUSY_MASK) {
  95                 dev_err(&bus->dev, "MII_MGMT read failed\n");
  96                 return -EBUSY;
  97         }
  98
  99         data = xgene_mdio_rd_mac(pdata, MII_MGMT_STATUS_ADDR);
 100         xgene_mdio_wr_mac(pdata, MII_MGMT_COMMAND_ADDR, 0);
 101
 102         return data;
 103 }
 104 EXPORT_SYMBOL(xgene_mdio_rgmii_read);
 105
 106 int xgene_mdio_rgmii_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
 107 {
 108         struct xgene_mdio_pdata *pdata = (struct xgene_mdio_pdata *)bus->priv;
 109         u32 val, done;
 110         u8 wait = 10;
 111
 112         val = SET_VAL(PHY_ADDR, phy_id) | SET_VAL(REG_ADDR, reg);
 113         xgene_mdio_wr_mac(pdata, MII_MGMT_ADDRESS_ADDR, val);
 114
 115         xgene_mdio_wr_mac(pdata, MII_MGMT_CONTROL_ADDR, data);
 116         do {
 117                 usleep_range(5, 10);
 118                 done = xgene_mdio_rd_mac(pdata, MII_MGMT_INDICATORS_ADDR);
 119         } while ((done & BUSY_MASK) && wait--);
 120
 121         if (done & BUSY_MASK) {
 122                 dev_err(&bus->dev, "MII_MGMT write failed\n");
 123                 return -EBUSY;
 124         }
 125
 126         return 0;
 127 }
 128 EXPORT_SYMBOL(xgene_mdio_rgmii_write);
 129
 130 static u32 xgene_menet_rd_diag_csr(struct xgene_mdio_pdata *pdata, u32 offset)
 131 {
 132         return ioread32(pdata->diag_csr_addr + offset);
 133 }
 134
 135 static void xgene_menet_wr_diag_csr(struct xgene_mdio_pdata *pdata,
 136                                     u32 offset, u32 val)
 137 {
 138         iowrite32(val, pdata->diag_csr_addr + offset);
 139 }
 140
 141 static int xgene_enet_ecc_init(struct xgene_mdio_pdata *pdata)
 142 {
 143         u32 data;
 144         u8 wait = 10;
 145
 146         xgene_menet_wr_diag_csr(pdata, MENET_CFG_MEM_RAM_SHUTDOWN_ADDR, 0x0);
 147         do {
 148                 usleep_range(100, 110);
 149                 data = xgene_menet_rd_diag_csr(pdata, MENET_BLOCK_MEM_RDY_ADDR);
 150         } while ((data != 0xffffffff) && wait--);
 151
 152         if (data != 0xffffffff) {
 153                 dev_err(pdata->dev, "Failed to release memory from shutdown\n");
 154                 return -ENODEV;
 155         }
 156
 157         return 0;
 158 }
 159
 160 static void xgene_gmac_reset(struct xgene_mdio_pdata *pdata)
 161 {
 162         xgene_mdio_wr_mac(pdata, MAC_CONFIG_1_ADDR, SOFT_RESET);
 163         xgene_mdio_wr_mac(pdata, MAC_CONFIG_1_ADDR, 0);
 164 }
 165
 166 static int xgene_mdio_reset(struct xgene_mdio_pdata *pdata)
 167 {
 168         int ret;
 169
 170         if (pdata->dev->of_node) {
 171                 clk_prepare_enable(pdata->clk);
 172                 udelay(5);
 173                 clk_disable_unprepare(pdata->clk);
 174                 udelay(5);
 175                 clk_prepare_enable(pdata->clk);
 176                 udelay(5);
 177         } else {
 178 #ifdef CONFIG_ACPI
 179                 acpi_evaluate_object(ACPI_HANDLE(pdata->dev),
 180                                      "_RST", NULL, NULL);
 181 #endif
 182         }
 183
 184         ret = xgene_enet_ecc_init(pdata);
 185         if (ret) {
 186                 if (pdata->dev->of_node)
 187                         clk_disable_unprepare(pdata->clk);
 188                 return ret;
 189         }
 190         xgene_gmac_reset(pdata);
 191
 192         return 0;
 193 }
 194
 195 static void xgene_enet_rd_mdio_csr(void __iomem *base_addr,
 196                                    u32 offset, u32 *val)
 197 {
 198         void __iomem *addr = base_addr  + offset;
 199
 200         *val = ioread32(addr);
 201 }
 202
 203 static void xgene_enet_wr_mdio_csr(void __iomem *base_addr,
 204                                    u32 offset, u32 val)
 205 {
 206         void __iomem *addr = base_addr  + offset;
 207
 208         iowrite32(val, addr);
 209 }
 210
 211 static int xgene_xfi_mdio_write(struct mii_bus *bus, int phy_id,
 212                                 int reg, u16 data)
 213 {
 214         void __iomem *addr = (void __iomem *)bus->priv;
 215         int timeout = 100;
 216         u32 status, val;
 217
 218         val = SET_VAL(HSTPHYADX, phy_id) | SET_VAL(HSTREGADX, reg) |
 219               SET_VAL(HSTMIIMWRDAT, data);
 220         xgene_enet_wr_mdio_csr(addr, MIIM_FIELD_ADDR, val);
 221
 222         val = HSTLDCMD | SET_VAL(HSTMIIMCMD, MIIM_CMD_LEGACY_WRITE);
 223         xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, val);
 224
 225         do {
 226                 usleep_range(5, 10);
 227                 xgene_enet_rd_mdio_csr(addr, MIIM_INDICATOR_ADDR, &status);
 228         } while ((status & BUSY_MASK) && timeout--);
 229
 230         xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, 0);
 231
 232         return 0;
 233 }
 234
 235 static int xgene_xfi_mdio_read(struct mii_bus *bus, int phy_id, int reg)
 236 {
 237         void __iomem *addr = (void __iomem *)bus->priv;
 238         u32 data, status, val;
 239         int timeout = 100;
 240
 241         val = SET_VAL(HSTPHYADX, phy_id) | SET_VAL(HSTREGADX, reg);
 242         xgene_enet_wr_mdio_csr(addr, MIIM_FIELD_ADDR, val);
 243
 244         val = HSTLDCMD | SET_VAL(HSTMIIMCMD, MIIM_CMD_LEGACY_READ);
 245         xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, val);
 246
 247         do {
 248                 usleep_range(5, 10);
 249                 xgene_enet_rd_mdio_csr(addr, MIIM_INDICATOR_ADDR, &status);
 250         } while ((status & BUSY_MASK) && timeout--);
 251
 252         if (status & BUSY_MASK) {
 253                 pr_err("XGENET_MII_MGMT write failed\n");
 254                 return -EBUSY;
 255         }
 256
 257         xgene_enet_rd_mdio_csr(addr, MIIMRD_FIELD_ADDR, &data);
 258         xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, 0);
 259
 260         return data;
 261 }
 262
 263 struct phy_device *xgene_enet_phy_register(struct mii_bus *bus, int phy_addr)
 264 {
 265         struct phy_device *phy_dev;
 266
 267         phy_dev = get_phy_device(bus, phy_addr, false);
 268         if (!phy_dev || IS_ERR(phy_dev))
 269                 return NULL;
 270
 271         if (phy_device_register(phy_dev))
 272                 phy_device_free(phy_dev);
 273
 274         return phy_dev;
 275 }
 276 EXPORT_SYMBOL(xgene_enet_phy_register);
 277
 278 #ifdef CONFIG_ACPI
 279 static acpi_status acpi_register_phy(acpi_handle handle, u32 lvl,
 280                                      void *context, void **ret)
 281 {
 282         struct mii_bus *mdio = context;
 283         struct acpi_device *adev;
 284         struct phy_device *phy_dev;
 285         const union acpi_object *obj;
 286         u32 phy_addr;
 287
 288         if (acpi_bus_get_device(handle, &adev))
 289                 return AE_OK;
 290
 291         if (acpi_dev_get_property(adev, "phy-channel", ACPI_TYPE_INTEGER, &obj))
 292                 return AE_OK;
 293         phy_addr = obj->integer.value;
 294
 295         phy_dev = xgene_enet_phy_register(mdio, phy_addr);
 296         adev->driver_data = phy_dev;
 297
 298         return AE_OK;
 299 }
 300 #endif
 301
 302 static const struct of_device_id xgene_mdio_of_match[] = {
 303         {
 304                 .compatible = "apm,xgene-mdio-rgmii",
 305                 .data = (void *)XGENE_MDIO_RGMII
 306         },
 307         {
 308                 .compatible = "apm,xgene-mdio-xfi",
 309                 .data = (void *)XGENE_MDIO_XFI
 310         },
 311         {},
 312 };
 313 MODULE_DEVICE_TABLE(of, xgene_mdio_of_match);
 314
 315 #ifdef CONFIG_ACPI
 316 static const struct acpi_device_id xgene_mdio_acpi_match[] = {
 317         { "APMC0D65", XGENE_MDIO_RGMII },
 318         { "APMC0D66", XGENE_MDIO_XFI },
 319         { }
 320 };
 321
 322 MODULE_DEVICE_TABLE(acpi, xgene_mdio_acpi_match);
 323 #endif
 324
 325
 326 static int xgene_mdio_probe(struct platform_device *pdev)
 327 {
 328         struct device *dev = &pdev->dev;
 329         struct mii_bus *mdio_bus;
 330         const struct of_device_id *of_id;
 331         struct resource *res;
 332         struct xgene_mdio_pdata *pdata;
 333         void __iomem *csr_base;
 334         int mdio_id = 0, ret = 0;
 335
 336         of_id = of_match_device(xgene_mdio_of_match, &pdev->dev);
 337         if (of_id) {
 338                 mdio_id = (enum xgene_mdio_id)of_id->data;
 339         } else {
 340 #ifdef CONFIG_ACPI
 341                 const struct acpi_device_id *acpi_id;
 342
 343                 acpi_id = acpi_match_device(xgene_mdio_acpi_match, &pdev->dev);
 344                 if (acpi_id)
 345                         mdio_id = (enum xgene_mdio_id)acpi_id->driver_data;
 346 #endif
 347         }
 348
 349         if (!mdio_id)
 350                 return -ENODEV;
 351
 352         pdata = devm_kzalloc(dev, sizeof(struct xgene_mdio_pdata), GFP_KERNEL);
 353         if (!pdata)
 354                 return -ENOMEM;
 355         pdata->mdio_id = mdio_id;
 356         pdata->dev = dev;
 357
 358         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 359         csr_base = devm_ioremap_resource(dev, res);
 360         if (IS_ERR(csr_base))
 361                 return PTR_ERR(csr_base);
 362         pdata->mac_csr_addr = csr_base;
 363         pdata->mdio_csr_addr = csr_base + BLOCK_XG_MDIO_CSR_OFFSET;
 364         pdata->diag_csr_addr = csr_base + BLOCK_DIAG_CSR_OFFSET;
 365
 366         if (mdio_id == XGENE_MDIO_RGMII)
 367                 spin_lock_init(&pdata->mac_lock);
 368
 369         if (dev->of_node) {
 370                 pdata->clk = devm_clk_get(dev, NULL);
 371                 if (IS_ERR(pdata->clk)) {
 372                         dev_err(dev, "Unable to retrieve clk\n");
 373                         return PTR_ERR(pdata->clk);
 374                 }
 375         }
 376
 377         ret = xgene_mdio_reset(pdata);
 378         if (ret)
 379                 return ret;
 380
 381         mdio_bus = mdiobus_alloc();
 382         if (!mdio_bus) {
 383                 ret = -ENOMEM;
 384                 goto out_clk;
 385         }
 386
 387         mdio_bus->name = "APM X-Gene MDIO bus";
 388
 389         if (mdio_id == XGENE_MDIO_RGMII) {
 390                 mdio_bus->read = xgene_mdio_rgmii_read;
 391                 mdio_bus->write = xgene_mdio_rgmii_write;
 392                 mdio_bus->priv = (void __force *)pdata;
 393                 snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s",
 394                          "xgene-mii-rgmii");
 395         } else {
 396                 mdio_bus->read = xgene_xfi_mdio_read;
 397                 mdio_bus->write = xgene_xfi_mdio_write;
 398                 mdio_bus->priv = (void __force *)pdata->mdio_csr_addr;
 399                 snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s",
 400                          "xgene-mii-xfi");
 401         }
 402
 403         mdio_bus->parent = dev;
 404         platform_set_drvdata(pdev, pdata);
 405
 406         if (dev->of_node) {
 407                 ret = of_mdiobus_register(mdio_bus, dev->of_node);
 408         } else {
 409 #ifdef CONFIG_ACPI
 410                 /* Mask out all PHYs from auto probing. */
 411                 mdio_bus->phy_mask = ~0;
 412                 ret = mdiobus_register(mdio_bus);
 413                 if (ret)
 414                         goto out_mdiobus;
 415
 416                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_HANDLE(dev), 1,
 417                                     acpi_register_phy, NULL, mdio_bus, NULL);
 418 #endif
 419         }
 420
 421         if (ret)
 422                 goto out_mdiobus;
 423
 424         pdata->mdio_bus = mdio_bus;
 425         xgene_mdio_status = true;
 426
 427         return 0;
 428
 429 out_mdiobus:
 430         mdiobus_free(mdio_bus);
 431
 432 out_clk:
 433         if (dev->of_node)
 434                 clk_disable_unprepare(pdata->clk);
 435
 436         return ret;
 437 }
 438
 439 static int xgene_mdio_remove(struct platform_device *pdev)
 440 {
 441         struct xgene_mdio_pdata *pdata = platform_get_drvdata(pdev);
 442         struct mii_bus *mdio_bus = pdata->mdio_bus;
 443         struct device *dev = &pdev->dev;
 444
 445         mdiobus_unregister(mdio_bus);
 446         mdiobus_free(mdio_bus);
 447
 448         if (dev->of_node)
 449                 clk_disable_unprepare(pdata->clk);
 450
 451         return 0;
 452 }
 453
 454 static struct platform_driver xgene_mdio_driver = {
 455         .driver = {
 456                 .name = "xgene-mdio",
 457                 .of_match_table = of_match_ptr(xgene_mdio_of_match),
 458                 .acpi_match_table = ACPI_PTR(xgene_mdio_acpi_match),
 459         },
 460         .probe = xgene_mdio_probe,
 461         .remove = xgene_mdio_remove,
 462 };
 463
 464 module_platform_driver(xgene_mdio_driver);
 465
 466 MODULE_DESCRIPTION("APM X-Gene SoC MDIO driver");
 467 MODULE_AUTHOR("Iyappan Subramanian <isubramanian@apm.com>");
 468 MODULE_LICENSE("GPL");