drivers/net/ethernet/sfc/falcon/qt202x_phy.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /****************************************************************************
   3  * Driver for Solarflare network controllers and boards
   4  * Copyright 2006-2012 Solarflare Communications Inc.
   5  */
   6 /*
   7  * Driver for AMCC QT202x SFP+ and XFP adapters; see www.amcc.com for details
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/timer.h>
  12 #include <linux/delay.h>
  13 #include "efx.h"
  14 #include "mdio_10g.h"
  15 #include "phy.h"
  16 #include "nic.h"
  17
  18 #define QT202X_REQUIRED_DEVS (MDIO_DEVS_PCS |           \
  19                               MDIO_DEVS_PMAPMD |        \
  20                               MDIO_DEVS_PHYXS)
  21
  22 #define QT202X_LOOPBACKS ((1 << LOOPBACK_PCS) |         \
  23                           (1 << LOOPBACK_PMAPMD) |      \
  24                           (1 << LOOPBACK_PHYXS_WS))
  25
  26 /****************************************************************************/
  27 /* Quake-specific MDIO registers */
  28 #define MDIO_QUAKE_LED0_REG     (0xD006)
  29
  30 /* QT2025C only */
  31 #define PCS_FW_HEARTBEAT_REG    0xd7ee
  32 #define PCS_FW_HEARTB_LBN       0
  33 #define PCS_FW_HEARTB_WIDTH     8
  34 #define PCS_FW_PRODUCT_CODE_1   0xd7f0
  35 #define PCS_FW_VERSION_1        0xd7f3
  36 #define PCS_FW_BUILD_1          0xd7f6
  37 #define PCS_UC8051_STATUS_REG   0xd7fd
  38 #define PCS_UC_STATUS_LBN       0
  39 #define PCS_UC_STATUS_WIDTH     8
  40 #define PCS_UC_STATUS_FW_SAVE   0x20
  41 #define PMA_PMD_MODE_REG        0xc301
  42 #define PMA_PMD_RXIN_SEL_LBN    6
  43 #define PMA_PMD_FTX_CTRL2_REG   0xc309
  44 #define PMA_PMD_FTX_STATIC_LBN  13
  45 #define PMA_PMD_VEND1_REG       0xc001
  46 #define PMA_PMD_VEND1_LBTXD_LBN 15
  47 #define PCS_VEND1_REG           0xc000
  48 #define PCS_VEND1_LBTXD_LBN     5
  49
  50 void falcon_qt202x_set_led(struct ef4_nic *p, int led, int mode)
  51 {
  52         int addr = MDIO_QUAKE_LED0_REG + led;
  53         ef4_mdio_write(p, MDIO_MMD_PMAPMD, addr, mode);
  54 }
  55
  56 struct qt202x_phy_data {
  57         enum ef4_phy_mode phy_mode;
  58         bool bug17190_in_bad_state;
  59         unsigned long bug17190_timer;
  60         u32 firmware_ver;
  61 };
  62
  63 #define QT2022C2_MAX_RESET_TIME 500
  64 #define QT2022C2_RESET_WAIT 10
  65
  66 #define QT2025C_MAX_HEARTB_TIME (5 * HZ)
  67 #define QT2025C_HEARTB_WAIT 100
  68 #define QT2025C_MAX_FWSTART_TIME (25 * HZ / 10)
  69 #define QT2025C_FWSTART_WAIT 100
  70
  71 #define BUG17190_INTERVAL (2 * HZ)
  72
  73 static int qt2025c_wait_heartbeat(struct ef4_nic *efx)
  74 {
  75         unsigned long timeout = jiffies + QT2025C_MAX_HEARTB_TIME;
  76         int reg, old_counter = 0;
  77
  78         /* Wait for firmware heartbeat to start */
  79         for (;;) {
  80                 int counter;
  81                 reg = ef4_mdio_read(efx, MDIO_MMD_PCS, PCS_FW_HEARTBEAT_REG);
  82                 if (reg < 0)
  83                         return reg;
  84                 counter = ((reg >> PCS_FW_HEARTB_LBN) &
  85                             ((1 << PCS_FW_HEARTB_WIDTH) - 1));
  86                 if (old_counter == 0)
  87                         old_counter = counter;
  88                 else if (counter != old_counter)
  89                         break;
  90                 if (time_after(jiffies, timeout)) {
  91                         /* Some cables have EEPROMs that conflict with the
  92                          * PHY's on-board EEPROM so it cannot load firmware */
  93                         netif_err(efx, hw, efx->net_dev,
  94                                   "If an SFP+ direct attach cable is"
  95                                   " connected, please check that it complies"
  96                                   " with the SFP+ specification\n");
  97                         return -ETIMEDOUT;
  98                 }
  99                 msleep(QT2025C_HEARTB_WAIT);
 100         }
 101
 102         return 0;
 103 }
 104
 105 static int qt2025c_wait_fw_status_good(struct ef4_nic *efx)
 106 {
 107         unsigned long timeout = jiffies + QT2025C_MAX_FWSTART_TIME;
 108         int reg;
 109
 110         /* Wait for firmware status to look good */
 111         for (;;) {
 112                 reg = ef4_mdio_read(efx, MDIO_MMD_PCS, PCS_UC8051_STATUS_REG);
 113                 if (reg < 0)
 114                         return reg;
 115                 if ((reg &
 116                      ((1 << PCS_UC_STATUS_WIDTH) - 1) << PCS_UC_STATUS_LBN) >=
 117                     PCS_UC_STATUS_FW_SAVE)
 118                         break;
 119                 if (time_after(jiffies, timeout))
 120                         return -ETIMEDOUT;
 121                 msleep(QT2025C_FWSTART_WAIT);
 122         }
 123
 124         return 0;
 125 }
 126
 127 static void qt2025c_restart_firmware(struct ef4_nic *efx)
 128 {
 129         /* Restart microcontroller execution of firmware from RAM */
 130         ef4_mdio_write(efx, 3, 0xe854, 0x00c0);
 131         ef4_mdio_write(efx, 3, 0xe854, 0x0040);
 132         msleep(50);
 133 }
 134
 135 static int qt2025c_wait_reset(struct ef4_nic *efx)
 136 {
 137         int rc;
 138
 139         rc = qt2025c_wait_heartbeat(efx);
 140         if (rc != 0)
 141                 return rc;
 142
 143         rc = qt2025c_wait_fw_status_good(efx);
 144         if (rc == -ETIMEDOUT) {
 145                 /* Bug 17689: occasionally heartbeat starts but firmware status
 146                  * code never progresses beyond 0x00.  Try again, once, after
 147                  * restarting execution of the firmware image. */
 148                 netif_dbg(efx, hw, efx->net_dev,
 149                           "bashing QT2025C microcontroller\n");
 150                 qt2025c_restart_firmware(efx);
 151                 rc = qt2025c_wait_heartbeat(efx);
 152                 if (rc != 0)
 153                         return rc;
 154                 rc = qt2025c_wait_fw_status_good(efx);
 155         }
 156
 157         return rc;
 158 }
 159
 160 static void qt2025c_firmware_id(struct ef4_nic *efx)
 161 {
 162         struct qt202x_phy_data *phy_data = efx->phy_data;
 163         u8 firmware_id[9];
 164         size_t i;
 165
 166         for (i = 0; i < sizeof(firmware_id); i++)
 167                 firmware_id[i] = ef4_mdio_read(efx, MDIO_MMD_PCS,
 168                                                PCS_FW_PRODUCT_CODE_1 + i);
 169         netif_info(efx, probe, efx->net_dev,
 170                    "QT2025C firmware %xr%d v%d.%d.%d.%d [20%02d-%02d-%02d]\n",
 171                    (firmware_id[0] << 8) | firmware_id[1], firmware_id[2],
 172                    firmware_id[3] >> 4, firmware_id[3] & 0xf,
 173                    firmware_id[4], firmware_id[5],
 174                    firmware_id[6], firmware_id[7], firmware_id[8]);
 175         phy_data->firmware_ver = ((firmware_id[3] & 0xf0) << 20) |
 176                                  ((firmware_id[3] & 0x0f) << 16) |
 177                                  (firmware_id[4] << 8) | firmware_id[5];
 178 }
 179
 180 static void qt2025c_bug17190_workaround(struct ef4_nic *efx)
 181 {
 182         struct qt202x_phy_data *phy_data = efx->phy_data;
 183
 184         /* The PHY can get stuck in a state where it reports PHY_XS and PMA/PMD
 185          * layers up, but PCS down (no block_lock).  If we notice this state
 186          * persisting for a couple of seconds, we switch PMA/PMD loopback
 187          * briefly on and then off again, which is normally sufficient to
 188          * recover it.
 189          */
 190         if (efx->link_state.up ||
 191             !ef4_mdio_links_ok(efx, MDIO_DEVS_PMAPMD | MDIO_DEVS_PHYXS)) {
 192                 phy_data->bug17190_in_bad_state = false;
 193                 return;
 194         }
 195
 196         if (!phy_data->bug17190_in_bad_state) {
 197                 phy_data->bug17190_in_bad_state = true;
 198                 phy_data->bug17190_timer = jiffies + BUG17190_INTERVAL;
 199                 return;
 200         }
 201
 202         if (time_after_eq(jiffies, phy_data->bug17190_timer)) {
 203                 netif_dbg(efx, hw, efx->net_dev, "bashing QT2025C PMA/PMD\n");
 204                 ef4_mdio_set_flag(efx, MDIO_MMD_PMAPMD, MDIO_CTRL1,
 205                                   MDIO_PMA_CTRL1_LOOPBACK, true);
 206                 msleep(100);
 207                 ef4_mdio_set_flag(efx, MDIO_MMD_PMAPMD, MDIO_CTRL1,
 208                                   MDIO_PMA_CTRL1_LOOPBACK, false);
 209                 phy_data->bug17190_timer = jiffies + BUG17190_INTERVAL;
 210         }
 211 }
 212
 213 static int qt2025c_select_phy_mode(struct ef4_nic *efx)
 214 {
 215         struct qt202x_phy_data *phy_data = efx->phy_data;
 216         struct falcon_board *board = falcon_board(efx);
 217         int reg, rc, i;
 218         uint16_t phy_op_mode;
 219
 220         /* Only 2.0.1.0+ PHY firmware supports the more optimal SFP+
 221          * Self-Configure mode.  Don't attempt any switching if we encounter
 222          * older firmware. */
 223         if (phy_data->firmware_ver < 0x02000100)
 224                 return 0;
 225
 226         /* In general we will get optimal behaviour in "SFP+ Self-Configure"
 227          * mode; however, that powers down most of the PHY when no module is
 228          * present, so we must use a different mode (any fixed mode will do)
 229          * to be sure that loopbacks will work. */
 230         phy_op_mode = (efx->loopback_mode == LOOPBACK_NONE) ? 0x0038 : 0x0020;
 231
 232         /* Only change mode if really necessary */
 233         reg = ef4_mdio_read(efx, 1, 0xc319);
 234         if ((reg & 0x0038) == phy_op_mode)
 235                 return 0;
 236         netif_dbg(efx, hw, efx->net_dev, "Switching PHY to mode 0x%04x\n",
 237                   phy_op_mode);
 238
 239         /* This sequence replicates the register writes configured in the boot
 240          * EEPROM (including the differences between board revisions), except
 241          * that the operating mode is changed, and the PHY is prevented from
 242          * unnecessarily reloading the main firmware image again. */
 243         ef4_mdio_write(efx, 1, 0xc300, 0x0000);
 244         /* (Note: this portion of the boot EEPROM sequence, which bit-bashes 9
 245          * STOPs onto the firmware/module I2C bus to reset it, varies across
 246          * board revisions, as the bus is connected to different GPIO/LED
 247          * outputs on the PHY.) */
 248         if (board->major == 0 && board->minor < 2) {
 249                 ef4_mdio_write(efx, 1, 0xc303, 0x4498);
 250                 for (i = 0; i < 9; i++) {
 251                         ef4_mdio_write(efx, 1, 0xc303, 0x4488);
 252                         ef4_mdio_write(efx, 1, 0xc303, 0x4480);
 253                         ef4_mdio_write(efx, 1, 0xc303, 0x4490);
 254                         ef4_mdio_write(efx, 1, 0xc303, 0x4498);
 255                 }
 256         } else {
 257                 ef4_mdio_write(efx, 1, 0xc303, 0x0920);
 258                 ef4_mdio_write(efx, 1, 0xd008, 0x0004);
 259                 for (i = 0; i < 9; i++) {
 260                         ef4_mdio_write(efx, 1, 0xc303, 0x0900);
 261                         ef4_mdio_write(efx, 1, 0xd008, 0x0005);
 262                         ef4_mdio_write(efx, 1, 0xc303, 0x0920);
 263                         ef4_mdio_write(efx, 1, 0xd008, 0x0004);
 264                 }
 265                 ef4_mdio_write(efx, 1, 0xc303, 0x4900);
 266         }
 267         ef4_mdio_write(efx, 1, 0xc303, 0x4900);
 268         ef4_mdio_write(efx, 1, 0xc302, 0x0004);
 269         ef4_mdio_write(efx, 1, 0xc316, 0x0013);
 270         ef4_mdio_write(efx, 1, 0xc318, 0x0054);
 271         ef4_mdio_write(efx, 1, 0xc319, phy_op_mode);
 272         ef4_mdio_write(efx, 1, 0xc31a, 0x0098);
 273         ef4_mdio_write(efx, 3, 0x0026, 0x0e00);
 274         ef4_mdio_write(efx, 3, 0x0027, 0x0013);
 275         ef4_mdio_write(efx, 3, 0x0028, 0xa528);
 276         ef4_mdio_write(efx, 1, 0xd006, 0x000a);
 277         ef4_mdio_write(efx, 1, 0xd007, 0x0009);
 278         ef4_mdio_write(efx, 1, 0xd008, 0x0004);
 279         /* This additional write is not present in the boot EEPROM.  It
 280          * prevents the PHY's internal boot ROM doing another pointless (and
 281          * slow) reload of the firmware image (the microcontroller's code
 282          * memory is not affected by the microcontroller reset). */
 283         ef4_mdio_write(efx, 1, 0xc317, 0x00ff);
 284         /* PMA/PMD loopback sets RXIN to inverse polarity and the firmware
 285          * restart doesn't reset it. We need to do that ourselves. */
 286         ef4_mdio_set_flag(efx, 1, PMA_PMD_MODE_REG,
 287                           1 << PMA_PMD_RXIN_SEL_LBN, false);
 288         ef4_mdio_write(efx, 1, 0xc300, 0x0002);
 289         msleep(20);
 290
 291         /* Restart microcontroller execution of firmware from RAM */
 292         qt2025c_restart_firmware(efx);
 293
 294         /* Wait for the microcontroller to be ready again */
 295         rc = qt2025c_wait_reset(efx);
 296         if (rc < 0) {
 297                 netif_err(efx, hw, efx->net_dev,
 298                           "PHY microcontroller reset during mode switch "
 299                           "timed out\n");
 300                 return rc;
 301         }
 302
 303         return 0;
 304 }
 305
 306 static int qt202x_reset_phy(struct ef4_nic *efx)
 307 {
 308         int rc;
 309
 310         if (efx->phy_type == PHY_TYPE_QT2025C) {
 311                 /* Wait for the reset triggered by falcon_reset_hw()
 312                  * to complete */
 313                 rc = qt2025c_wait_reset(efx);
 314                 if (rc < 0)
 315                         goto fail;
 316         } else {
 317                 /* Reset the PHYXS MMD. This is documented as doing
 318                  * a complete soft reset. */
 319                 rc = ef4_mdio_reset_mmd(efx, MDIO_MMD_PHYXS,
 320                                         QT2022C2_MAX_RESET_TIME /
 321                                         QT2022C2_RESET_WAIT,
 322                                         QT2022C2_RESET_WAIT);
 323                 if (rc < 0)
 324                         goto fail;
 325         }
 326
 327         /* Wait 250ms for the PHY to complete bootup */
 328         msleep(250);
 329
 330         falcon_board(efx)->type->init_phy(efx);
 331
 332         return 0;
 333
 334  fail:
 335         netif_err(efx, hw, efx->net_dev, "PHY reset timed out\n");
 336         return rc;
 337 }
 338
 339 static int qt202x_phy_probe(struct ef4_nic *efx)
 340 {
 341         struct qt202x_phy_data *phy_data;
 342
 343         phy_data = kzalloc(sizeof(struct qt202x_phy_data), GFP_KERNEL);
 344         if (!phy_data)
 345                 return -ENOMEM;
 346         efx->phy_data = phy_data;
 347         phy_data->phy_mode = efx->phy_mode;
 348         phy_data->bug17190_in_bad_state = false;
 349         phy_data->bug17190_timer = 0;
 350
 351         efx->mdio.mmds = QT202X_REQUIRED_DEVS;
 352         efx->mdio.mode_support = MDIO_SUPPORTS_C45 | MDIO_EMULATE_C22;
 353         efx->loopback_modes = QT202X_LOOPBACKS | FALCON_XMAC_LOOPBACKS;
 354         return 0;
 355 }
 356
 357 static int qt202x_phy_init(struct ef4_nic *efx)
 358 {
 359         u32 devid;
 360         int rc;
 361
 362         rc = qt202x_reset_phy(efx);
 363         if (rc) {
 364                 netif_err(efx, probe, efx->net_dev, "PHY init failed\n");
 365                 return rc;
 366         }
 367
 368         devid = ef4_mdio_read_id(efx, MDIO_MMD_PHYXS);
 369         netif_info(efx, probe, efx->net_dev,
 370                    "PHY ID reg %x (OUI %06x model %02x revision %x)\n",
 371                    devid, ef4_mdio_id_oui(devid), ef4_mdio_id_model(devid),
 372                    ef4_mdio_id_rev(devid));
 373
 374         if (efx->phy_type == PHY_TYPE_QT2025C)
 375                 qt2025c_firmware_id(efx);
 376
 377         return 0;
 378 }
 379
 380 static int qt202x_link_ok(struct ef4_nic *efx)
 381 {
 382         return ef4_mdio_links_ok(efx, QT202X_REQUIRED_DEVS);
 383 }
 384
 385 static bool qt202x_phy_poll(struct ef4_nic *efx)
 386 {
 387         bool was_up = efx->link_state.up;
 388
 389         efx->link_state.up = qt202x_link_ok(efx);
 390         efx->link_state.speed = 10000;
 391         efx->link_state.fd = true;
 392         efx->link_state.fc = efx->wanted_fc;
 393
 394         if (efx->phy_type == PHY_TYPE_QT2025C)
 395                 qt2025c_bug17190_workaround(efx);
 396
 397         return efx->link_state.up != was_up;
 398 }
 399
 400 static int qt202x_phy_reconfigure(struct ef4_nic *efx)
 401 {
 402         struct qt202x_phy_data *phy_data = efx->phy_data;
 403
 404         if (efx->phy_type == PHY_TYPE_QT2025C) {
 405                 int rc = qt2025c_select_phy_mode(efx);
 406                 if (rc)
 407                         return rc;
 408
 409                 /* There are several different register bits which can
 410                  * disable TX (and save power) on direct-attach cables
 411                  * or optical transceivers, varying somewhat between
 412                  * firmware versions.  Only 'static mode' appears to
 413                  * cover everything. */
 414                 mdio_set_flag(
 415                         &efx->mdio, efx->mdio.prtad, MDIO_MMD_PMAPMD,
 416                         PMA_PMD_FTX_CTRL2_REG, 1 << PMA_PMD_FTX_STATIC_LBN,
 417                         efx->phy_mode & PHY_MODE_TX_DISABLED ||
 418                         efx->phy_mode & PHY_MODE_LOW_POWER ||
 419                         efx->loopback_mode == LOOPBACK_PCS ||
 420                         efx->loopback_mode == LOOPBACK_PMAPMD);
 421         } else {
 422                 /* Reset the PHY when moving from tx off to tx on */
 423                 if (!(efx->phy_mode & PHY_MODE_TX_DISABLED) &&
 424                     (phy_data->phy_mode & PHY_MODE_TX_DISABLED))
 425                         qt202x_reset_phy(efx);
 426
 427                 ef4_mdio_transmit_disable(efx);
 428         }
 429
 430         ef4_mdio_phy_reconfigure(efx);
 431
 432         phy_data->phy_mode = efx->phy_mode;
 433
 434         return 0;
 435 }
 436
 437 static void qt202x_phy_get_link_ksettings(struct ef4_nic *efx,
 438                                           struct ethtool_link_ksettings *cmd)
 439 {
 440         mdio45_ethtool_ksettings_get(&efx->mdio, cmd);
 441 }
 442
 443 static void qt202x_phy_remove(struct ef4_nic *efx)
 444 {
 445         /* Free the context block */
 446         kfree(efx->phy_data);
 447         efx->phy_data = NULL;
 448 }
 449
 450 static int qt202x_phy_get_module_info(struct ef4_nic *efx,
 451                                       struct ethtool_modinfo *modinfo)
 452 {
 453         modinfo->type = ETH_MODULE_SFF_8079;
 454         modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
 455         return 0;
 456 }
 457
 458 static int qt202x_phy_get_module_eeprom(struct ef4_nic *efx,
 459                                         struct ethtool_eeprom *ee, u8 *data)
 460 {
 461         int mmd, reg_base, rc, i;
 462
 463         if (efx->phy_type == PHY_TYPE_QT2025C) {
 464                 mmd = MDIO_MMD_PCS;
 465                 reg_base = 0xd000;
 466         } else {
 467                 mmd = MDIO_MMD_PMAPMD;
 468                 reg_base = 0x8007;
 469         }
 470
 471         for (i = 0; i < ee->len; i++) {
 472                 rc = ef4_mdio_read(efx, mmd, reg_base + ee->offset + i);
 473                 if (rc < 0)
 474                         return rc;
 475                 data[i] = rc;
 476         }
 477
 478         return 0;
 479 }
 480
 481 const struct ef4_phy_operations falcon_qt202x_phy_ops = {
 482         .probe           = qt202x_phy_probe,
 483         .init            = qt202x_phy_init,
 484         .reconfigure     = qt202x_phy_reconfigure,
 485         .poll            = qt202x_phy_poll,
 486         .fini            = ef4_port_dummy_op_void,
 487         .remove          = qt202x_phy_remove,
 488         .get_link_ksettings = qt202x_phy_get_link_ksettings,
 489         .set_link_ksettings = ef4_mdio_set_link_ksettings,
 490         .test_alive      = ef4_mdio_test_alive,
 491         .get_module_eeprom = qt202x_phy_get_module_eeprom,
 492         .get_module_info = qt202x_phy_get_module_info,
 493 };