linux/drivers/net/phy/icplus.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Driver for ICPlus PHYs
   4 *
   5 * Copyright (c) 2007 Freescale Semiconductor, Inc.
   6 */
   7#include <linux/kernel.h>
   8#include <linux/string.h>
   9#include <linux/errno.h>
  10#include <linux/unistd.h>
  11#include <linux/interrupt.h>
  12#include <linux/init.h>
  13#include <linux/delay.h>
  14#include <linux/netdevice.h>
  15#include <linux/etherdevice.h>
  16#include <linux/skbuff.h>
  17#include <linux/spinlock.h>
  18#include <linux/mm.h>
  19#include <linux/module.h>
  20#include <linux/mii.h>
  21#include <linux/ethtool.h>
  22#include <linux/phy.h>
  23#include <linux/property.h>
  24
  25#include <asm/io.h>
  26#include <asm/irq.h>
  27#include <linux/uaccess.h>
  28
  29MODULE_DESCRIPTION("ICPlus IP175C/IP101A/IP101G/IC1001 PHY drivers");
  30MODULE_AUTHOR("Michael Barkowski");
  31MODULE_LICENSE("GPL");
  32
  33/* IP101A/G - IP1001 */
  34#define IP10XX_SPEC_CTRL_STATUS         16      /* Spec. Control Register */
  35#define IP1001_RXPHASE_SEL              BIT(0)  /* Add delay on RX_CLK */
  36#define IP1001_TXPHASE_SEL              BIT(1)  /* Add delay on TX_CLK */
  37#define IP1001_SPEC_CTRL_STATUS_2       20      /* IP1001 Spec. Control Reg 2 */
  38#define IP1001_APS_ON                   11      /* IP1001 APS Mode  bit */
  39#define IP101A_G_APS_ON                 BIT(1)  /* IP101A/G APS Mode bit */
  40#define IP101A_G_AUTO_MDIX_DIS          BIT(11)
  41#define IP101A_G_IRQ_CONF_STATUS        0x11    /* Conf Info IRQ & Status Reg */
  42#define IP101A_G_IRQ_PIN_USED           BIT(15) /* INTR pin used */
  43#define IP101A_G_IRQ_ALL_MASK           BIT(11) /* IRQ's inactive */
  44#define IP101A_G_IRQ_SPEED_CHANGE       BIT(2)
  45#define IP101A_G_IRQ_DUPLEX_CHANGE      BIT(1)
  46#define IP101A_G_IRQ_LINK_CHANGE        BIT(0)
  47#define IP101A_G_PHY_STATUS             18
  48#define IP101A_G_MDIX                   BIT(9)
  49#define IP101A_G_PHY_SPEC_CTRL          30
  50#define IP101A_G_FORCE_MDIX             BIT(3)
  51
  52#define IP101G_PAGE_CONTROL                             0x14
  53#define IP101G_PAGE_CONTROL_MASK                        GENMASK(4, 0)
  54#define IP101G_DIGITAL_IO_SPEC_CTRL                     0x1d
  55#define IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32          BIT(2)
  56
  57#define IP101G_DEFAULT_PAGE                     16
  58
  59#define IP101G_P1_CNT_CTRL              17
  60#define CNT_CTRL_RX_EN                  BIT(13)
  61#define IP101G_P8_CNT_CTRL              17
  62#define CNT_CTRL_RDCLR_EN               BIT(15)
  63#define IP101G_CNT_REG                  18
  64
  65#define IP175C_PHY_ID 0x02430d80
  66#define IP1001_PHY_ID 0x02430d90
  67#define IP101A_PHY_ID 0x02430c54
  68
  69/* The 32-pin IP101GR package can re-configure the mode of the RXER/INTR_32 pin
  70 * (pin number 21). The hardware default is RXER (receive error) mode. But it
  71 * can be configured to interrupt mode manually.
  72 */
  73enum ip101gr_sel_intr32 {
  74        IP101GR_SEL_INTR32_KEEP,
  75        IP101GR_SEL_INTR32_INTR,
  76        IP101GR_SEL_INTR32_RXER,
  77};
  78
  79struct ip101g_hw_stat {
  80        const char *name;
  81        int page;
  82};
  83
  84static struct ip101g_hw_stat ip101g_hw_stats[] = {
  85        { "phy_crc_errors", 1 },
  86        { "phy_symbol_errors", 11, },
  87};
  88
  89struct ip101a_g_phy_priv {
  90        enum ip101gr_sel_intr32 sel_intr32;
  91        u64 stats[ARRAY_SIZE(ip101g_hw_stats)];
  92};
  93
  94static int ip175c_config_init(struct phy_device *phydev)
  95{
  96        int err, i;
  97        static int full_reset_performed;
  98
  99        if (full_reset_performed == 0) {
 100
 101                /* master reset */
 102                err = mdiobus_write(phydev->mdio.bus, 30, 0, 0x175c);
 103                if (err < 0)
 104                        return err;
 105
 106                /* ensure no bus delays overlap reset period */
 107                err = mdiobus_read(phydev->mdio.bus, 30, 0);
 108
 109                /* data sheet specifies reset period is 2 msec */
 110                mdelay(2);
 111
 112                /* enable IP175C mode */
 113                err = mdiobus_write(phydev->mdio.bus, 29, 31, 0x175c);
 114                if (err < 0)
 115                        return err;
 116
 117                /* Set MII0 speed and duplex (in PHY mode) */
 118                err = mdiobus_write(phydev->mdio.bus, 29, 22, 0x420);
 119                if (err < 0)
 120                        return err;
 121
 122                /* reset switch ports */
 123                for (i = 0; i < 5; i++) {
 124                        err = mdiobus_write(phydev->mdio.bus, i,
 125                                            MII_BMCR, BMCR_RESET);
 126                        if (err < 0)
 127                                return err;
 128                }
 129
 130                for (i = 0; i < 5; i++)
 131                        err = mdiobus_read(phydev->mdio.bus, i, MII_BMCR);
 132
 133                mdelay(2);
 134
 135                full_reset_performed = 1;
 136        }
 137
 138        if (phydev->mdio.addr != 4) {
 139                phydev->state = PHY_RUNNING;
 140                phydev->speed = SPEED_100;
 141                phydev->duplex = DUPLEX_FULL;
 142                phydev->link = 1;
 143                netif_carrier_on(phydev->attached_dev);
 144        }
 145
 146        return 0;
 147}
 148
 149static int ip1001_config_init(struct phy_device *phydev)
 150{
 151        int c;
 152
 153        /* Enable Auto Power Saving mode */
 154        c = phy_read(phydev, IP1001_SPEC_CTRL_STATUS_2);
 155        if (c < 0)
 156                return c;
 157        c |= IP1001_APS_ON;
 158        c = phy_write(phydev, IP1001_SPEC_CTRL_STATUS_2, c);
 159        if (c < 0)
 160                return c;
 161
 162        if (phy_interface_is_rgmii(phydev)) {
 163
 164                c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
 165                if (c < 0)
 166                        return c;
 167
 168                c &= ~(IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
 169
 170                if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
 171                        c |= (IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
 172                else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
 173                        c |= IP1001_RXPHASE_SEL;
 174                else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
 175                        c |= IP1001_TXPHASE_SEL;
 176
 177                c = phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
 178                if (c < 0)
 179                        return c;
 180        }
 181
 182        return 0;
 183}
 184
 185static int ip175c_read_status(struct phy_device *phydev)
 186{
 187        if (phydev->mdio.addr == 4) /* WAN port */
 188                genphy_read_status(phydev);
 189        else
 190                /* Don't need to read status for switch ports */
 191                phydev->irq = PHY_MAC_INTERRUPT;
 192
 193        return 0;
 194}
 195
 196static int ip175c_config_aneg(struct phy_device *phydev)
 197{
 198        if (phydev->mdio.addr == 4) /* WAN port */
 199                genphy_config_aneg(phydev);
 200
 201        return 0;
 202}
 203
 204static int ip101a_g_probe(struct phy_device *phydev)
 205{
 206        struct device *dev = &phydev->mdio.dev;
 207        struct ip101a_g_phy_priv *priv;
 208
 209        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 210        if (!priv)
 211                return -ENOMEM;
 212
 213        /* Both functions (RX error and interrupt status) are sharing the same
 214         * pin on the 32-pin IP101GR, so this is an exclusive choice.
 215         */
 216        if (device_property_read_bool(dev, "icplus,select-rx-error") &&
 217            device_property_read_bool(dev, "icplus,select-interrupt")) {
 218                dev_err(dev,
 219                        "RXER and INTR mode cannot be selected together\n");
 220                return -EINVAL;
 221        }
 222
 223        if (device_property_read_bool(dev, "icplus,select-rx-error"))
 224                priv->sel_intr32 = IP101GR_SEL_INTR32_RXER;
 225        else if (device_property_read_bool(dev, "icplus,select-interrupt"))
 226                priv->sel_intr32 = IP101GR_SEL_INTR32_INTR;
 227        else
 228                priv->sel_intr32 = IP101GR_SEL_INTR32_KEEP;
 229
 230        phydev->priv = priv;
 231
 232        return 0;
 233}
 234
 235static int ip101a_g_config_intr_pin(struct phy_device *phydev)
 236{
 237        struct ip101a_g_phy_priv *priv = phydev->priv;
 238        int oldpage, err = 0;
 239
 240        oldpage = phy_select_page(phydev, IP101G_DEFAULT_PAGE);
 241        if (oldpage < 0)
 242                goto out;
 243
 244        /* configure the RXER/INTR_32 pin of the 32-pin IP101GR if needed: */
 245        switch (priv->sel_intr32) {
 246        case IP101GR_SEL_INTR32_RXER:
 247                err = __phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
 248                                   IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32, 0);
 249                if (err < 0)
 250                        goto out;
 251                break;
 252
 253        case IP101GR_SEL_INTR32_INTR:
 254                err = __phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
 255                                   IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32,
 256                                   IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32);
 257                if (err < 0)
 258                        goto out;
 259                break;
 260
 261        default:
 262                /* Don't touch IP101G_DIGITAL_IO_SPEC_CTRL because it's not
 263                 * documented on IP101A and it's not clear whether this would
 264                 * cause problems.
 265                 * For the 32-pin IP101GR we simply keep the SEL_INTR32
 266                 * configuration as set by the bootloader when not configured
 267                 * to one of the special functions.
 268                 */
 269                break;
 270        }
 271
 272out:
 273        return phy_restore_page(phydev, oldpage, err);
 274}
 275
 276static int ip101a_config_init(struct phy_device *phydev)
 277{
 278        int ret;
 279
 280        /* Enable Auto Power Saving mode */
 281        ret = phy_set_bits(phydev, IP10XX_SPEC_CTRL_STATUS, IP101A_G_APS_ON);
 282        if (ret)
 283                return ret;
 284
 285        return ip101a_g_config_intr_pin(phydev);
 286}
 287
 288static int ip101g_config_init(struct phy_device *phydev)
 289{
 290        int ret;
 291
 292        /* Enable the PHY counters */
 293        ret = phy_modify_paged(phydev, 1, IP101G_P1_CNT_CTRL,
 294                               CNT_CTRL_RX_EN, CNT_CTRL_RX_EN);
 295        if (ret)
 296                return ret;
 297
 298        /* Clear error counters on read */
 299        ret = phy_modify_paged(phydev, 8, IP101G_P8_CNT_CTRL,
 300                               CNT_CTRL_RDCLR_EN, CNT_CTRL_RDCLR_EN);
 301        if (ret)
 302                return ret;
 303
 304        return ip101a_g_config_intr_pin(phydev);
 305}
 306
 307static int ip101a_g_read_status(struct phy_device *phydev)
 308{
 309        int oldpage, ret, stat1, stat2;
 310
 311        ret = genphy_read_status(phydev);
 312        if (ret)
 313                return ret;
 314
 315        oldpage = phy_select_page(phydev, IP101G_DEFAULT_PAGE);
 316        if (oldpage < 0)
 317                goto out;
 318
 319        ret = __phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
 320        if (ret < 0)
 321                goto out;
 322        stat1 = ret;
 323
 324        ret = __phy_read(phydev, IP101A_G_PHY_SPEC_CTRL);
 325        if (ret < 0)
 326                goto out;
 327        stat2 = ret;
 328
 329        if (stat1 & IP101A_G_AUTO_MDIX_DIS) {
 330                if (stat2 & IP101A_G_FORCE_MDIX)
 331                        phydev->mdix_ctrl = ETH_TP_MDI_X;
 332                else
 333                        phydev->mdix_ctrl = ETH_TP_MDI;
 334        } else {
 335                phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
 336        }
 337
 338        if (stat2 & IP101A_G_MDIX)
 339                phydev->mdix = ETH_TP_MDI_X;
 340        else
 341                phydev->mdix = ETH_TP_MDI;
 342
 343        ret = 0;
 344
 345out:
 346        return phy_restore_page(phydev, oldpage, ret);
 347}
 348
 349static int ip101a_g_config_mdix(struct phy_device *phydev)
 350{
 351        u16 ctrl = 0, ctrl2 = 0;
 352        int oldpage;
 353        int ret = 0;
 354
 355        switch (phydev->mdix_ctrl) {
 356        case ETH_TP_MDI:
 357                ctrl = IP101A_G_AUTO_MDIX_DIS;
 358                break;
 359        case ETH_TP_MDI_X:
 360                ctrl = IP101A_G_AUTO_MDIX_DIS;
 361                ctrl2 = IP101A_G_FORCE_MDIX;
 362                break;
 363        case ETH_TP_MDI_AUTO:
 364                break;
 365        default:
 366                return 0;
 367        }
 368
 369        oldpage = phy_select_page(phydev, IP101G_DEFAULT_PAGE);
 370        if (oldpage < 0)
 371                goto out;
 372
 373        ret = __phy_modify(phydev, IP10XX_SPEC_CTRL_STATUS,
 374                           IP101A_G_AUTO_MDIX_DIS, ctrl);
 375        if (ret)
 376                goto out;
 377
 378        ret = __phy_modify(phydev, IP101A_G_PHY_SPEC_CTRL,
 379                           IP101A_G_FORCE_MDIX, ctrl2);
 380
 381out:
 382        return phy_restore_page(phydev, oldpage, ret);
 383}
 384
 385static int ip101a_g_config_aneg(struct phy_device *phydev)
 386{
 387        int ret;
 388
 389        ret = ip101a_g_config_mdix(phydev);
 390        if (ret)
 391                return ret;
 392
 393        return genphy_config_aneg(phydev);
 394}
 395
 396static int ip101a_g_ack_interrupt(struct phy_device *phydev)
 397{
 398        int err;
 399
 400        err = phy_read_paged(phydev, IP101G_DEFAULT_PAGE,
 401                             IP101A_G_IRQ_CONF_STATUS);
 402        if (err < 0)
 403                return err;
 404
 405        return 0;
 406}
 407
 408static int ip101a_g_config_intr(struct phy_device *phydev)
 409{
 410        u16 val;
 411        int err;
 412
 413        if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
 414                err = ip101a_g_ack_interrupt(phydev);
 415                if (err)
 416                        return err;
 417
 418                /* INTR pin used: Speed/link/duplex will cause an interrupt */
 419                val = IP101A_G_IRQ_PIN_USED;
 420                err = phy_write_paged(phydev, IP101G_DEFAULT_PAGE,
 421                                      IP101A_G_IRQ_CONF_STATUS, val);
 422        } else {
 423                val = IP101A_G_IRQ_ALL_MASK;
 424                err = phy_write_paged(phydev, IP101G_DEFAULT_PAGE,
 425                                      IP101A_G_IRQ_CONF_STATUS, val);
 426                if (err)
 427                        return err;
 428
 429                err = ip101a_g_ack_interrupt(phydev);
 430        }
 431
 432        return err;
 433}
 434
 435static irqreturn_t ip101a_g_handle_interrupt(struct phy_device *phydev)
 436{
 437        int irq_status;
 438
 439        irq_status = phy_read_paged(phydev, IP101G_DEFAULT_PAGE,
 440                                    IP101A_G_IRQ_CONF_STATUS);
 441        if (irq_status < 0) {
 442                phy_error(phydev);
 443                return IRQ_NONE;
 444        }
 445
 446        if (!(irq_status & (IP101A_G_IRQ_SPEED_CHANGE |
 447                            IP101A_G_IRQ_DUPLEX_CHANGE |
 448                            IP101A_G_IRQ_LINK_CHANGE)))
 449                return IRQ_NONE;
 450
 451        phy_trigger_machine(phydev);
 452
 453        return IRQ_HANDLED;
 454}
 455
 456/* The IP101A doesn't really have a page register. We just pretend to have one
 457 * so we can use the paged versions of the callbacks of the IP101G.
 458 */
 459static int ip101a_read_page(struct phy_device *phydev)
 460{
 461        return IP101G_DEFAULT_PAGE;
 462}
 463
 464static int ip101a_write_page(struct phy_device *phydev, int page)
 465{
 466        WARN_ONCE(page != IP101G_DEFAULT_PAGE, "wrong page selected\n");
 467
 468        return 0;
 469}
 470
 471static int ip101g_read_page(struct phy_device *phydev)
 472{
 473        return __phy_read(phydev, IP101G_PAGE_CONTROL);
 474}
 475
 476static int ip101g_write_page(struct phy_device *phydev, int page)
 477{
 478        return __phy_write(phydev, IP101G_PAGE_CONTROL, page);
 479}
 480
 481static int ip101a_g_has_page_register(struct phy_device *phydev)
 482{
 483        int oldval, val, ret;
 484
 485        oldval = phy_read(phydev, IP101G_PAGE_CONTROL);
 486        if (oldval < 0)
 487                return oldval;
 488
 489        ret = phy_write(phydev, IP101G_PAGE_CONTROL, 0xffff);
 490        if (ret)
 491                return ret;
 492
 493        val = phy_read(phydev, IP101G_PAGE_CONTROL);
 494        if (val < 0)
 495                return val;
 496
 497        ret = phy_write(phydev, IP101G_PAGE_CONTROL, oldval);
 498        if (ret)
 499                return ret;
 500
 501        return val == IP101G_PAGE_CONTROL_MASK;
 502}
 503
 504static int ip101a_g_match_phy_device(struct phy_device *phydev, bool ip101a)
 505{
 506        int ret;
 507
 508        if (phydev->phy_id != IP101A_PHY_ID)
 509                return 0;
 510
 511        /* The IP101A and the IP101G share the same PHY identifier.The IP101G
 512         * seems to be a successor of the IP101A and implements more functions.
 513         * Amongst other things there is a page select register, which is not
 514         * available on the IP101A. Use this to distinguish these two.
 515         */
 516        ret = ip101a_g_has_page_register(phydev);
 517        if (ret < 0)
 518                return ret;
 519
 520        return ip101a == !ret;
 521}
 522
 523static int ip101a_match_phy_device(struct phy_device *phydev)
 524{
 525        return ip101a_g_match_phy_device(phydev, true);
 526}
 527
 528static int ip101g_match_phy_device(struct phy_device *phydev)
 529{
 530        return ip101a_g_match_phy_device(phydev, false);
 531}
 532
 533static int ip101g_get_sset_count(struct phy_device *phydev)
 534{
 535        return ARRAY_SIZE(ip101g_hw_stats);
 536}
 537
 538static void ip101g_get_strings(struct phy_device *phydev, u8 *data)
 539{
 540        int i;
 541
 542        for (i = 0; i < ARRAY_SIZE(ip101g_hw_stats); i++)
 543                strscpy(data + i * ETH_GSTRING_LEN,
 544                        ip101g_hw_stats[i].name, ETH_GSTRING_LEN);
 545}
 546
 547static u64 ip101g_get_stat(struct phy_device *phydev, int i)
 548{
 549        struct ip101g_hw_stat stat = ip101g_hw_stats[i];
 550        struct ip101a_g_phy_priv *priv = phydev->priv;
 551        int val;
 552        u64 ret;
 553
 554        val = phy_read_paged(phydev, stat.page, IP101G_CNT_REG);
 555        if (val < 0) {
 556                ret = U64_MAX;
 557        } else {
 558                priv->stats[i] += val;
 559                ret = priv->stats[i];
 560        }
 561
 562        return ret;
 563}
 564
 565static void ip101g_get_stats(struct phy_device *phydev,
 566                             struct ethtool_stats *stats, u64 *data)
 567{
 568        int i;
 569
 570        for (i = 0; i < ARRAY_SIZE(ip101g_hw_stats); i++)
 571                data[i] = ip101g_get_stat(phydev, i);
 572}
 573
 574static struct phy_driver icplus_driver[] = {
 575{
 576        PHY_ID_MATCH_MODEL(IP175C_PHY_ID),
 577        .name           = "ICPlus IP175C",
 578        /* PHY_BASIC_FEATURES */
 579        .config_init    = ip175c_config_init,
 580        .config_aneg    = ip175c_config_aneg,
 581        .read_status    = ip175c_read_status,
 582        .suspend        = genphy_suspend,
 583        .resume         = genphy_resume,
 584}, {
 585        PHY_ID_MATCH_MODEL(IP1001_PHY_ID),
 586        .name           = "ICPlus IP1001",
 587        /* PHY_GBIT_FEATURES */
 588        .config_init    = ip1001_config_init,
 589        .soft_reset     = genphy_soft_reset,
 590        .suspend        = genphy_suspend,
 591        .resume         = genphy_resume,
 592}, {
 593        .name           = "ICPlus IP101A",
 594        .match_phy_device = ip101a_match_phy_device,
 595        .probe          = ip101a_g_probe,
 596        .read_page      = ip101a_read_page,
 597        .write_page     = ip101a_write_page,
 598        .config_intr    = ip101a_g_config_intr,
 599        .handle_interrupt = ip101a_g_handle_interrupt,
 600        .config_init    = ip101a_config_init,
 601        .config_aneg    = ip101a_g_config_aneg,
 602        .read_status    = ip101a_g_read_status,
 603        .soft_reset     = genphy_soft_reset,
 604        .suspend        = genphy_suspend,
 605        .resume         = genphy_resume,
 606}, {
 607        .name           = "ICPlus IP101G",
 608        .match_phy_device = ip101g_match_phy_device,
 609        .probe          = ip101a_g_probe,
 610        .read_page      = ip101g_read_page,
 611        .write_page     = ip101g_write_page,
 612        .config_intr    = ip101a_g_config_intr,
 613        .handle_interrupt = ip101a_g_handle_interrupt,
 614        .config_init    = ip101g_config_init,
 615        .config_aneg    = ip101a_g_config_aneg,
 616        .read_status    = ip101a_g_read_status,
 617        .soft_reset     = genphy_soft_reset,
 618        .get_sset_count = ip101g_get_sset_count,
 619        .get_strings    = ip101g_get_strings,
 620        .get_stats      = ip101g_get_stats,
 621        .suspend        = genphy_suspend,
 622        .resume         = genphy_resume,
 623} };
 624
 625module_phy_driver(icplus_driver);
 626
 627static struct mdio_device_id __maybe_unused icplus_tbl[] = {
 628        { PHY_ID_MATCH_MODEL(IP175C_PHY_ID) },
 629        { PHY_ID_MATCH_MODEL(IP1001_PHY_ID) },
 630        { PHY_ID_MATCH_EXACT(IP101A_PHY_ID) },
 631        { }
 632};
 633
 634MODULE_DEVICE_TABLE(mdio, icplus_tbl);
 635
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