drivers/net/sfc/tenxpress.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2007-2008 Solarflare Communications Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published
   7  * by the Free Software Foundation, incorporated herein by reference.
   8  */
   9
  10 #include <linux/delay.h>
  11 #include <linux/seq_file.h>
  12 #include "efx.h"
  13 #include "mdio_10g.h"
  14 #include "falcon.h"
  15 #include "phy.h"
  16 #include "falcon_hwdefs.h"
  17 #include "boards.h"
  18
  19 /* We expect these MMDs to be in the package */
  20 #define TENXPRESS_REQUIRED_DEVS (MDIO_MMDREG_DEVS_PMAPMD        | \
  21                                  MDIO_MMDREG_DEVS_PCS           | \
  22                                  MDIO_MMDREG_DEVS_PHYXS         | \
  23                                  MDIO_MMDREG_DEVS_AN)
  24
  25 #define TENXPRESS_LOOPBACKS ((1 << LOOPBACK_PHYXS) |    \
  26                              (1 << LOOPBACK_PCS) |      \
  27                              (1 << LOOPBACK_PMAPMD) |   \
  28                              (1 << LOOPBACK_NETWORK))
  29
  30 /* We complain if we fail to see the link partner as 10G capable this many
  31  * times in a row (must be > 1 as sampling the autoneg. registers is racy)
  32  */
  33 #define MAX_BAD_LP_TRIES        (5)
  34
  35 /* Extended control register */
  36 #define PMA_PMD_XCONTROL_REG 0xc000
  37 #define PMA_PMD_LNPGA_POWERDOWN_LBN 8
  38 #define PMA_PMD_LNPGA_POWERDOWN_WIDTH 1
  39
  40 /* extended status register */
  41 #define PMA_PMD_XSTATUS_REG 0xc001
  42 #define PMA_PMD_XSTAT_FLP_LBN   (12)
  43
  44 /* LED control register */
  45 #define PMA_PMD_LED_CTRL_REG    (0xc007)
  46 #define PMA_PMA_LED_ACTIVITY_LBN        (3)
  47
  48 /* LED function override register */
  49 #define PMA_PMD_LED_OVERR_REG   (0xc009)
  50 /* Bit positions for different LEDs (there are more but not wired on SFE4001)*/
  51 #define PMA_PMD_LED_LINK_LBN    (0)
  52 #define PMA_PMD_LED_SPEED_LBN   (2)
  53 #define PMA_PMD_LED_TX_LBN      (4)
  54 #define PMA_PMD_LED_RX_LBN      (6)
  55 /* Override settings */
  56 #define PMA_PMD_LED_AUTO        (0)     /* H/W control */
  57 #define PMA_PMD_LED_ON          (1)
  58 #define PMA_PMD_LED_OFF         (2)
  59 #define PMA_PMD_LED_FLASH       (3)
  60 #define PMA_PMD_LED_MASK        3
  61 /* All LEDs under hardware control */
  62 #define PMA_PMD_LED_FULL_AUTO   (0)
  63 /* Green and Amber under hardware control, Red off */
  64 #define PMA_PMD_LED_DEFAULT     (PMA_PMD_LED_OFF << PMA_PMD_LED_RX_LBN)
  65
  66
  67 /* Special Software reset register */
  68 #define PMA_PMD_EXT_CTRL_REG 49152
  69 #define PMA_PMD_EXT_SSR_LBN 15
  70
  71 /* Misc register defines */
  72 #define PCS_CLOCK_CTRL_REG 0xd801
  73 #define PLL312_RST_N_LBN 2
  74
  75 #define PCS_SOFT_RST2_REG 0xd806
  76 #define SERDES_RST_N_LBN 13
  77 #define XGXS_RST_N_LBN 12
  78
  79 #define PCS_TEST_SELECT_REG 0xd807      /* PRM 10.5.8 */
  80 #define CLK312_EN_LBN 3
  81
  82 /* PHYXS registers */
  83 #define PHYXS_TEST1         (49162)
  84 #define LOOPBACK_NEAR_LBN   (8)
  85 #define LOOPBACK_NEAR_WIDTH (1)
  86
  87 /* Boot status register */
  88 #define PCS_BOOT_STATUS_REG     (0xd000)
  89 #define PCS_BOOT_FATAL_ERR_LBN  (0)
  90 #define PCS_BOOT_PROGRESS_LBN   (1)
  91 #define PCS_BOOT_PROGRESS_WIDTH (2)
  92 #define PCS_BOOT_COMPLETE_LBN   (3)
  93 #define PCS_BOOT_MAX_DELAY      (100)
  94 #define PCS_BOOT_POLL_DELAY     (10)
  95
  96 /* Time to wait between powering down the LNPGA and turning off the power
  97  * rails */
  98 #define LNPGA_PDOWN_WAIT        (HZ / 5)
  99
 100 static int crc_error_reset_threshold = 100;
 101 module_param(crc_error_reset_threshold, int, 0644);
 102 MODULE_PARM_DESC(crc_error_reset_threshold,
 103                  "Max number of CRC errors before XAUI reset");
 104
 105 struct tenxpress_phy_data {
 106         enum efx_loopback_mode loopback_mode;
 107         atomic_t bad_crc_count;
 108         enum efx_phy_mode phy_mode;
 109         int bad_lp_tries;
 110 };
 111
 112 void tenxpress_crc_err(struct efx_nic *efx)
 113 {
 114         struct tenxpress_phy_data *phy_data = efx->phy_data;
 115         if (phy_data != NULL)
 116                 atomic_inc(&phy_data->bad_crc_count);
 117 }
 118
 119 /* Check that the C166 has booted successfully */
 120 static int tenxpress_phy_check(struct efx_nic *efx)
 121 {
 122         int phy_id = efx->mii.phy_id;
 123         int count = PCS_BOOT_MAX_DELAY / PCS_BOOT_POLL_DELAY;
 124         int boot_stat;
 125
 126         /* Wait for the boot to complete (or not) */
 127         while (count) {
 128                 boot_stat = mdio_clause45_read(efx, phy_id,
 129                                                MDIO_MMD_PCS,
 130                                                PCS_BOOT_STATUS_REG);
 131                 if (boot_stat & (1 << PCS_BOOT_COMPLETE_LBN))
 132                         break;
 133                 count--;
 134                 udelay(PCS_BOOT_POLL_DELAY);
 135         }
 136
 137         if (!count) {
 138                 EFX_ERR(efx, "%s: PHY boot timed out. Last status "
 139                         "%x\n", __func__,
 140                         (boot_stat >> PCS_BOOT_PROGRESS_LBN) &
 141                         ((1 << PCS_BOOT_PROGRESS_WIDTH) - 1));
 142                 return -ETIMEDOUT;
 143         }
 144
 145         return 0;
 146 }
 147
 148 static int tenxpress_init(struct efx_nic *efx)
 149 {
 150         int rc, reg;
 151
 152         /* Turn on the clock  */
 153         reg = (1 << CLK312_EN_LBN);
 154         mdio_clause45_write(efx, efx->mii.phy_id,
 155                             MDIO_MMD_PCS, PCS_TEST_SELECT_REG, reg);
 156
 157         rc = tenxpress_phy_check(efx);
 158         if (rc < 0)
 159                 return rc;
 160
 161         /* Set the LEDs up as: Green = Link, Amber = Link/Act, Red = Off */
 162         reg = mdio_clause45_read(efx, efx->mii.phy_id,
 163                                  MDIO_MMD_PMAPMD, PMA_PMD_LED_CTRL_REG);
 164         reg |= (1 << PMA_PMA_LED_ACTIVITY_LBN);
 165         mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
 166                             PMA_PMD_LED_CTRL_REG, reg);
 167
 168         reg = PMA_PMD_LED_DEFAULT;
 169         mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
 170                             PMA_PMD_LED_OVERR_REG, reg);
 171
 172         return rc;
 173 }
 174
 175 static int tenxpress_phy_init(struct efx_nic *efx)
 176 {
 177         struct tenxpress_phy_data *phy_data;
 178         int rc = 0;
 179
 180         phy_data = kzalloc(sizeof(*phy_data), GFP_KERNEL);
 181         if (!phy_data)
 182                 return -ENOMEM;
 183         efx->phy_data = phy_data;
 184         phy_data->phy_mode = efx->phy_mode;
 185
 186         rc = mdio_clause45_wait_reset_mmds(efx,
 187                                            TENXPRESS_REQUIRED_DEVS);
 188         if (rc < 0)
 189                 goto fail;
 190
 191         rc = mdio_clause45_check_mmds(efx, TENXPRESS_REQUIRED_DEVS, 0);
 192         if (rc < 0)
 193                 goto fail;
 194
 195         rc = tenxpress_init(efx);
 196         if (rc < 0)
 197                 goto fail;
 198
 199         schedule_timeout_uninterruptible(HZ / 5); /* 200ms */
 200
 201         /* Let XGXS and SerDes out of reset and resets 10XPress */
 202         falcon_reset_xaui(efx);
 203
 204         return 0;
 205
 206  fail:
 207         kfree(efx->phy_data);
 208         efx->phy_data = NULL;
 209         return rc;
 210 }
 211
 212 static int tenxpress_special_reset(struct efx_nic *efx)
 213 {
 214         int rc, reg;
 215
 216         /* The XGMAC clock is driven from the SFC7101/SFT9001 312MHz clock, so
 217          * a special software reset can glitch the XGMAC sufficiently for stats
 218          * requests to fail. Since we don't ofen special_reset, just lock. */
 219         spin_lock(&efx->stats_lock);
 220
 221         /* Initiate reset */
 222         reg = mdio_clause45_read(efx, efx->mii.phy_id,
 223                                  MDIO_MMD_PMAPMD, PMA_PMD_EXT_CTRL_REG);
 224         reg |= (1 << PMA_PMD_EXT_SSR_LBN);
 225         mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
 226                             PMA_PMD_EXT_CTRL_REG, reg);
 227
 228         mdelay(200);
 229
 230         /* Wait for the blocks to come out of reset */
 231         rc = mdio_clause45_wait_reset_mmds(efx,
 232                                            TENXPRESS_REQUIRED_DEVS);
 233         if (rc < 0)
 234                 goto unlock;
 235
 236         /* Try and reconfigure the device */
 237         rc = tenxpress_init(efx);
 238         if (rc < 0)
 239                 goto unlock;
 240
 241 unlock:
 242         spin_unlock(&efx->stats_lock);
 243         return rc;
 244 }
 245
 246 static void tenxpress_check_bad_lp(struct efx_nic *efx, bool link_ok)
 247 {
 248         struct tenxpress_phy_data *pd = efx->phy_data;
 249         int phy_id = efx->mii.phy_id;
 250         bool bad_lp;
 251         int reg;
 252
 253         if (link_ok) {
 254                 bad_lp = false;
 255         } else {
 256                 /* Check that AN has started but not completed. */
 257                 reg = mdio_clause45_read(efx, phy_id, MDIO_MMD_AN,
 258                                          MDIO_AN_STATUS);
 259                 if (!(reg & (1 << MDIO_AN_STATUS_LP_AN_CAP_LBN)))
 260                         return; /* LP status is unknown */
 261                 bad_lp = !(reg & (1 << MDIO_AN_STATUS_AN_DONE_LBN));
 262                 if (bad_lp)
 263                         pd->bad_lp_tries++;
 264         }
 265
 266         /* Nothing to do if all is well and was previously so. */
 267         if (!pd->bad_lp_tries)
 268                 return;
 269
 270         /* Use the RX (red) LED as an error indicator once we've seen AN
 271          * failure several times in a row, and also log a message. */
 272         if (!bad_lp || pd->bad_lp_tries == MAX_BAD_LP_TRIES) {
 273                 reg = mdio_clause45_read(efx, phy_id, MDIO_MMD_PMAPMD,
 274                                          PMA_PMD_LED_OVERR_REG);
 275                 reg &= ~(PMA_PMD_LED_MASK << PMA_PMD_LED_RX_LBN);
 276                 if (!bad_lp) {
 277                         reg |= PMA_PMD_LED_OFF << PMA_PMD_LED_RX_LBN;
 278                 } else {
 279                         reg |= PMA_PMD_LED_FLASH << PMA_PMD_LED_RX_LBN;
 280                         EFX_ERR(efx, "appears to be plugged into a port"
 281                                 " that is not 10GBASE-T capable. The PHY"
 282                                 " supports 10GBASE-T ONLY, so no link can"
 283                                 " be established\n");
 284                 }
 285                 mdio_clause45_write(efx, phy_id, MDIO_MMD_PMAPMD,
 286                                     PMA_PMD_LED_OVERR_REG, reg);
 287                 pd->bad_lp_tries = bad_lp;
 288         }
 289 }
 290
 291 static bool tenxpress_link_ok(struct efx_nic *efx)
 292 {
 293         if (efx->loopback_mode == LOOPBACK_NONE)
 294                 return mdio_clause45_links_ok(efx, MDIO_MMDREG_DEVS_AN);
 295         else
 296                 return mdio_clause45_links_ok(efx,
 297                                               MDIO_MMDREG_DEVS_PMAPMD |
 298                                               MDIO_MMDREG_DEVS_PCS |
 299                                               MDIO_MMDREG_DEVS_PHYXS);
 300 }
 301
 302 static void tenxpress_phyxs_loopback(struct efx_nic *efx)
 303 {
 304         int phy_id = efx->mii.phy_id;
 305         int ctrl1, ctrl2;
 306
 307         ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PHYXS,
 308                                            PHYXS_TEST1);
 309         if (efx->loopback_mode == LOOPBACK_PHYXS)
 310                 ctrl2 |= (1 << LOOPBACK_NEAR_LBN);
 311         else
 312                 ctrl2 &= ~(1 << LOOPBACK_NEAR_LBN);
 313         if (ctrl1 != ctrl2)
 314                 mdio_clause45_write(efx, phy_id, MDIO_MMD_PHYXS,
 315                                     PHYXS_TEST1, ctrl2);
 316 }
 317
 318 static void tenxpress_phy_reconfigure(struct efx_nic *efx)
 319 {
 320         struct tenxpress_phy_data *phy_data = efx->phy_data;
 321         bool loop_change = LOOPBACK_OUT_OF(phy_data, efx,
 322                                            TENXPRESS_LOOPBACKS);
 323
 324         if (efx->phy_mode & PHY_MODE_SPECIAL) {
 325                 phy_data->phy_mode = efx->phy_mode;
 326                 return;
 327         }
 328
 329         /* When coming out of transmit disable, coming out of low power
 330          * mode, or moving out of any PHY internal loopback mode,
 331          * perform a special software reset */
 332         if ((efx->phy_mode == PHY_MODE_NORMAL &&
 333              phy_data->phy_mode != PHY_MODE_NORMAL) ||
 334             loop_change) {
 335                 tenxpress_special_reset(efx);
 336                 falcon_reset_xaui(efx);
 337         }
 338
 339         mdio_clause45_transmit_disable(efx);
 340         mdio_clause45_phy_reconfigure(efx);
 341         tenxpress_phyxs_loopback(efx);
 342
 343         phy_data->loopback_mode = efx->loopback_mode;
 344         phy_data->phy_mode = efx->phy_mode;
 345         efx->link_up = tenxpress_link_ok(efx);
 346         efx->link_speed = 10000;
 347         efx->link_fd = true;
 348         efx->link_fc = mdio_clause45_get_pause(efx);
 349 }
 350
 351 static void tenxpress_phy_clear_interrupt(struct efx_nic *efx)
 352 {
 353         /* Nothing done here - LASI interrupts aren't reliable so poll  */
 354 }
 355
 356
 357 /* Poll PHY for interrupt */
 358 static int tenxpress_phy_check_hw(struct efx_nic *efx)
 359 {
 360         struct tenxpress_phy_data *phy_data = efx->phy_data;
 361         bool link_ok;
 362         int rc = 0;
 363
 364         link_ok = tenxpress_link_ok(efx);
 365         tenxpress_check_bad_lp(efx, link_ok);
 366
 367         if (link_ok != efx->link_up)
 368                 falcon_sim_phy_event(efx);
 369
 370         if (phy_data->phy_mode != PHY_MODE_NORMAL)
 371                 return 0;
 372
 373         if (atomic_read(&phy_data->bad_crc_count) > crc_error_reset_threshold) {
 374                 EFX_ERR(efx, "Resetting XAUI due to too many CRC errors\n");
 375                 falcon_reset_xaui(efx);
 376                 atomic_set(&phy_data->bad_crc_count, 0);
 377         }
 378
 379         rc = efx->board_info.monitor(efx);
 380         if (rc) {
 381                 EFX_ERR(efx, "Board sensor %s; shutting down PHY\n",
 382                         (rc == -ERANGE) ? "reported fault" : "failed");
 383                 if (efx->phy_mode & PHY_MODE_OFF) {
 384                         /* Assume that board has shut PHY off */
 385                         phy_data->phy_mode = PHY_MODE_OFF;
 386                 } else {
 387                         efx->phy_mode |= PHY_MODE_LOW_POWER;
 388                         mdio_clause45_set_mmds_lpower(efx, true,
 389                                                       efx->phy_op->mmds);
 390                         phy_data->phy_mode |= PHY_MODE_LOW_POWER;
 391                 }
 392         }
 393
 394         return rc;
 395 }
 396
 397 static void tenxpress_phy_fini(struct efx_nic *efx)
 398 {
 399         int reg;
 400
 401         /* Power down the LNPGA */
 402         reg = (1 << PMA_PMD_LNPGA_POWERDOWN_LBN);
 403         mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
 404                             PMA_PMD_XCONTROL_REG, reg);
 405
 406         /* Waiting here ensures that the board fini, which can turn off the
 407          * power to the PHY, won't get run until the LNPGA powerdown has been
 408          * given long enough to complete. */
 409         schedule_timeout_uninterruptible(LNPGA_PDOWN_WAIT); /* 200 ms */
 410
 411         kfree(efx->phy_data);
 412         efx->phy_data = NULL;
 413 }
 414
 415
 416 /* Set the RX and TX LEDs and Link LED flashing. The other LEDs
 417  * (which probably aren't wired anyway) are left in AUTO mode */
 418 void tenxpress_phy_blink(struct efx_nic *efx, bool blink)
 419 {
 420         int reg;
 421
 422         if (blink)
 423                 reg = (PMA_PMD_LED_FLASH << PMA_PMD_LED_TX_LBN) |
 424                         (PMA_PMD_LED_FLASH << PMA_PMD_LED_RX_LBN) |
 425                         (PMA_PMD_LED_FLASH << PMA_PMD_LED_LINK_LBN);
 426         else
 427                 reg = PMA_PMD_LED_DEFAULT;
 428
 429         mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
 430                             PMA_PMD_LED_OVERR_REG, reg);
 431 }
 432
 433 static int tenxpress_phy_test(struct efx_nic *efx)
 434 {
 435         /* BIST is automatically run after a special software reset */
 436         return tenxpress_special_reset(efx);
 437 }
 438
 439 static u32 tenxpress_get_xnp_lpa(struct efx_nic *efx)
 440 {
 441         int phy = efx->mii.phy_id;
 442         u32 lpa = 0;
 443         int reg;
 444
 445         reg = mdio_clause45_read(efx, phy, MDIO_MMD_AN, MDIO_AN_10GBT_STATUS);
 446         if (reg & (1 << MDIO_AN_10GBT_STATUS_LP_10G_LBN))
 447                 lpa |= ADVERTISED_10000baseT_Full;
 448         return lpa;
 449 }
 450
 451 static void
 452 tenxpress_get_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
 453 {
 454         mdio_clause45_get_settings_ext(efx, ecmd, ADVERTISED_10000baseT_Full,
 455                                        tenxpress_get_xnp_lpa(efx));
 456         ecmd->supported |= SUPPORTED_10000baseT_Full;
 457         ecmd->advertising |= ADVERTISED_10000baseT_Full;
 458 }
 459
 460 struct efx_phy_operations falcon_tenxpress_phy_ops = {
 461         .macs             = EFX_XMAC,
 462         .init             = tenxpress_phy_init,
 463         .reconfigure      = tenxpress_phy_reconfigure,
 464         .check_hw         = tenxpress_phy_check_hw,
 465         .fini             = tenxpress_phy_fini,
 466         .clear_interrupt  = tenxpress_phy_clear_interrupt,
 467         .test             = tenxpress_phy_test,
 468         .get_settings     = tenxpress_get_settings,
 469         .set_settings     = mdio_clause45_set_settings,
 470         .mmds             = TENXPRESS_REQUIRED_DEVS,
 471         .loopbacks        = TENXPRESS_LOOPBACKS,
 472 };