drivers/net/sfc/sfe4001.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 /*****************************************************************************
  11  * Support for the SFE4001 and SFN4111T NICs.
  12  *
  13  * The SFE4001 does not power-up fully at reset due to its high power
  14  * consumption.  We control its power via a PCA9539 I/O expander.
  15  * Both boards have a MAX6647 temperature monitor which we expose to
  16  * the lm90 driver.
  17  *
  18  * This also provides minimal support for reflashing the PHY, which is
  19  * initiated by resetting it with the FLASH_CFG_1 pin pulled down.
  20  * On SFE4001 rev A2 and later this is connected to the 3V3X output of
  21  * the IO-expander; on the SFN4111T it is connected to Falcon's GPIO3.
  22  * We represent reflash mode as PHY_MODE_SPECIAL and make it mutually
  23  * exclusive with the network device being open.
  24  */
  25
  26 #include <linux/delay.h>
  27 #include <linux/rtnetlink.h>
  28 #include "net_driver.h"
  29 #include "efx.h"
  30 #include "phy.h"
  31 #include "boards.h"
  32 #include "falcon.h"
  33 #include "falcon_hwdefs.h"
  34 #include "falcon_io.h"
  35 #include "mac.h"
  36 #include "workarounds.h"
  37
  38 /**************************************************************************
  39  *
  40  * I2C IO Expander device
  41  *
  42  **************************************************************************/
  43 #define PCA9539 0x74
  44
  45 #define P0_IN 0x00
  46 #define P0_OUT 0x02
  47 #define P0_INVERT 0x04
  48 #define P0_CONFIG 0x06
  49
  50 #define P0_EN_1V0X_LBN 0
  51 #define P0_EN_1V0X_WIDTH 1
  52 #define P0_EN_1V2_LBN 1
  53 #define P0_EN_1V2_WIDTH 1
  54 #define P0_EN_2V5_LBN 2
  55 #define P0_EN_2V5_WIDTH 1
  56 #define P0_EN_3V3X_LBN 3
  57 #define P0_EN_3V3X_WIDTH 1
  58 #define P0_EN_5V_LBN 4
  59 #define P0_EN_5V_WIDTH 1
  60 #define P0_SHORTEN_JTAG_LBN 5
  61 #define P0_SHORTEN_JTAG_WIDTH 1
  62 #define P0_X_TRST_LBN 6
  63 #define P0_X_TRST_WIDTH 1
  64 #define P0_DSP_RESET_LBN 7
  65 #define P0_DSP_RESET_WIDTH 1
  66
  67 #define P1_IN 0x01
  68 #define P1_OUT 0x03
  69 #define P1_INVERT 0x05
  70 #define P1_CONFIG 0x07
  71
  72 #define P1_AFE_PWD_LBN 0
  73 #define P1_AFE_PWD_WIDTH 1
  74 #define P1_DSP_PWD25_LBN 1
  75 #define P1_DSP_PWD25_WIDTH 1
  76 #define P1_RESERVED_LBN 2
  77 #define P1_RESERVED_WIDTH 2
  78 #define P1_SPARE_LBN 4
  79 #define P1_SPARE_WIDTH 4
  80
  81 /* Temperature Sensor */
  82 #define MAX664X_REG_RSL         0x02
  83 #define MAX664X_REG_WLHO        0x0B
  84
  85 static void sfe4001_poweroff(struct efx_nic *efx)
  86 {
  87         struct i2c_client *ioexp_client = efx->board_info.ioexp_client;
  88         struct i2c_client *hwmon_client = efx->board_info.hwmon_client;
  89
  90         /* Turn off all power rails and disable outputs */
  91         i2c_smbus_write_byte_data(ioexp_client, P0_OUT, 0xff);
  92         i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG, 0xff);
  93         i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0xff);
  94
  95         /* Clear any over-temperature alert */
  96         i2c_smbus_read_byte_data(hwmon_client, MAX664X_REG_RSL);
  97 }
  98
  99 static int sfe4001_poweron(struct efx_nic *efx)
 100 {
 101         struct i2c_client *hwmon_client = efx->board_info.hwmon_client;
 102         struct i2c_client *ioexp_client = efx->board_info.ioexp_client;
 103         unsigned int i, j;
 104         int rc;
 105         u8 out;
 106
 107         /* Clear any previous over-temperature alert */
 108         rc = i2c_smbus_read_byte_data(hwmon_client, MAX664X_REG_RSL);
 109         if (rc < 0)
 110                 return rc;
 111
 112         /* Enable port 0 and port 1 outputs on IO expander */
 113         rc = i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0x00);
 114         if (rc)
 115                 return rc;
 116         rc = i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG,
 117                                        0xff & ~(1 << P1_SPARE_LBN));
 118         if (rc)
 119                 goto fail_on;
 120
 121         /* If PHY power is on, turn it all off and wait 1 second to
 122          * ensure a full reset.
 123          */
 124         rc = i2c_smbus_read_byte_data(ioexp_client, P0_OUT);
 125         if (rc < 0)
 126                 goto fail_on;
 127         out = 0xff & ~((0 << P0_EN_1V2_LBN) | (0 << P0_EN_2V5_LBN) |
 128                        (0 << P0_EN_3V3X_LBN) | (0 << P0_EN_5V_LBN) |
 129                        (0 << P0_EN_1V0X_LBN));
 130         if (rc != out) {
 131                 EFX_INFO(efx, "power-cycling PHY\n");
 132                 rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
 133                 if (rc)
 134                         goto fail_on;
 135                 schedule_timeout_uninterruptible(HZ);
 136         }
 137
 138         for (i = 0; i < 20; ++i) {
 139                 /* Turn on 1.2V, 2.5V, 3.3V and 5V power rails */
 140                 out = 0xff & ~((1 << P0_EN_1V2_LBN) | (1 << P0_EN_2V5_LBN) |
 141                                (1 << P0_EN_3V3X_LBN) | (1 << P0_EN_5V_LBN) |
 142                                (1 << P0_X_TRST_LBN));
 143                 if (efx->phy_mode & PHY_MODE_SPECIAL)
 144                         out |= 1 << P0_EN_3V3X_LBN;
 145
 146                 rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
 147                 if (rc)
 148                         goto fail_on;
 149                 msleep(10);
 150
 151                 /* Turn on 1V power rail */
 152                 out &= ~(1 << P0_EN_1V0X_LBN);
 153                 rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
 154                 if (rc)
 155                         goto fail_on;
 156
 157                 EFX_INFO(efx, "waiting for DSP boot (attempt %d)...\n", i);
 158
 159                 /* In flash config mode, DSP does not turn on AFE, so
 160                  * just wait 1 second.
 161                  */
 162                 if (efx->phy_mode & PHY_MODE_SPECIAL) {
 163                         schedule_timeout_uninterruptible(HZ);
 164                         return 0;
 165                 }
 166
 167                 for (j = 0; j < 10; ++j) {
 168                         msleep(100);
 169
 170                         /* Check DSP has asserted AFE power line */
 171                         rc = i2c_smbus_read_byte_data(ioexp_client, P1_IN);
 172                         if (rc < 0)
 173                                 goto fail_on;
 174                         if (rc & (1 << P1_AFE_PWD_LBN))
 175                                 return 0;
 176                 }
 177         }
 178
 179         EFX_INFO(efx, "timed out waiting for DSP boot\n");
 180         rc = -ETIMEDOUT;
 181 fail_on:
 182         sfe4001_poweroff(efx);
 183         return rc;
 184 }
 185
 186 static int sfn4111t_reset(struct efx_nic *efx)
 187 {
 188         efx_oword_t reg;
 189
 190         /* GPIO 3 and the GPIO register are shared with I2C, so block that */
 191         mutex_lock(&efx->i2c_adap.bus_lock);
 192
 193         /* Pull RST_N (GPIO 2) low then let it up again, setting the
 194          * FLASH_CFG_1 strap (GPIO 3) appropriately.  Only change the
 195          * output enables; the output levels should always be 0 (low)
 196          * and we rely on external pull-ups. */
 197         falcon_read(efx, &reg, GPIO_CTL_REG_KER);
 198         EFX_SET_OWORD_FIELD(reg, GPIO2_OEN, true);
 199         falcon_write(efx, &reg, GPIO_CTL_REG_KER);
 200         msleep(1000);
 201         EFX_SET_OWORD_FIELD(reg, GPIO2_OEN, false);
 202         EFX_SET_OWORD_FIELD(reg, GPIO3_OEN,
 203                             !!(efx->phy_mode & PHY_MODE_SPECIAL));
 204         falcon_write(efx, &reg, GPIO_CTL_REG_KER);
 205         msleep(1);
 206
 207         mutex_unlock(&efx->i2c_adap.bus_lock);
 208
 209         ssleep(1);
 210         return 0;
 211 }
 212
 213 static ssize_t show_phy_flash_cfg(struct device *dev,
 214                                   struct device_attribute *attr, char *buf)
 215 {
 216         struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
 217         return sprintf(buf, "%d\n", !!(efx->phy_mode & PHY_MODE_SPECIAL));
 218 }
 219
 220 static ssize_t set_phy_flash_cfg(struct device *dev,
 221                                  struct device_attribute *attr,
 222                                  const char *buf, size_t count)
 223 {
 224         struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
 225         enum efx_phy_mode old_mode, new_mode;
 226         int err;
 227
 228         rtnl_lock();
 229         old_mode = efx->phy_mode;
 230         if (count == 0 || *buf == '0')
 231                 new_mode = old_mode & ~PHY_MODE_SPECIAL;
 232         else
 233                 new_mode = PHY_MODE_SPECIAL;
 234         if (old_mode == new_mode) {
 235                 err = 0;
 236         } else if (efx->state != STATE_RUNNING || netif_running(efx->net_dev)) {
 237                 err = -EBUSY;
 238         } else {
 239                 /* Reset the PHY, reconfigure the MAC and enable/disable
 240                  * MAC stats accordingly. */
 241                 efx->phy_mode = new_mode;
 242                 if (new_mode & PHY_MODE_SPECIAL)
 243                         efx_stats_disable(efx);
 244                 if (efx->board_info.type == EFX_BOARD_SFE4001)
 245                         err = sfe4001_poweron(efx);
 246                 else
 247                         err = sfn4111t_reset(efx);
 248                 efx_reconfigure_port(efx);
 249                 if (!(new_mode & PHY_MODE_SPECIAL))
 250                         efx_stats_enable(efx);
 251         }
 252         rtnl_unlock();
 253
 254         return err ? err : count;
 255 }
 256
 257 static DEVICE_ATTR(phy_flash_cfg, 0644, show_phy_flash_cfg, set_phy_flash_cfg);
 258
 259 static void sfe4001_fini(struct efx_nic *efx)
 260 {
 261         EFX_INFO(efx, "%s\n", __func__);
 262
 263         device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
 264         sfe4001_poweroff(efx);
 265         i2c_unregister_device(efx->board_info.ioexp_client);
 266         i2c_unregister_device(efx->board_info.hwmon_client);
 267 }
 268
 269 static int sfe4001_check_hw(struct efx_nic *efx)
 270 {
 271         s32 status;
 272
 273         /* If XAUI link is up then do not monitor */
 274         if (EFX_WORKAROUND_7884(efx) && efx->mac_up)
 275                 return 0;
 276
 277         /* Check the powered status of the PHY. Lack of power implies that
 278          * the MAX6647 has shut down power to it, probably due to a temp.
 279          * alarm. Reading the power status rather than the MAX6647 status
 280          * directly because the later is read-to-clear and would thus
 281          * start to power up the PHY again when polled, causing us to blip
 282          * the power undesirably.
 283          * We know we can read from the IO expander because we did
 284          * it during power-on. Assume failure now is bad news. */
 285         status = i2c_smbus_read_byte_data(efx->board_info.ioexp_client, P1_IN);
 286         if (status >= 0 &&
 287             (status & ((1 << P1_AFE_PWD_LBN) | (1 << P1_DSP_PWD25_LBN))) != 0)
 288                 return 0;
 289
 290         /* Use board power control, not PHY power control */
 291         sfe4001_poweroff(efx);
 292         efx->phy_mode = PHY_MODE_OFF;
 293
 294         return (status < 0) ? -EIO : -ERANGE;
 295 }
 296
 297 static struct i2c_board_info sfe4001_hwmon_info = {
 298         I2C_BOARD_INFO("max6647", 0x4e),
 299         .irq            = -1,
 300 };
 301
 302 /* This board uses an I2C expander to provider power to the PHY, which needs to
 303  * be turned on before the PHY can be used.
 304  * Context: Process context, rtnl lock held
 305  */
 306 int sfe4001_init(struct efx_nic *efx)
 307 {
 308         int rc;
 309
 310 #if defined(CONFIG_SENSORS_LM90) || defined(CONFIG_SENSORS_LM90_MODULE)
 311         efx->board_info.hwmon_client =
 312                 i2c_new_device(&efx->i2c_adap, &sfe4001_hwmon_info);
 313 #else
 314         efx->board_info.hwmon_client =
 315                 i2c_new_dummy(&efx->i2c_adap, sfe4001_hwmon_info.addr);
 316 #endif
 317         if (!efx->board_info.hwmon_client)
 318                 return -EIO;
 319
 320         /* Raise board/PHY high limit from 85 to 90 degrees Celsius */
 321         rc = i2c_smbus_write_byte_data(efx->board_info.hwmon_client,
 322                                        MAX664X_REG_WLHO, 90);
 323         if (rc)
 324                 goto fail_hwmon;
 325
 326         efx->board_info.ioexp_client = i2c_new_dummy(&efx->i2c_adap, PCA9539);
 327         if (!efx->board_info.ioexp_client) {
 328                 rc = -EIO;
 329                 goto fail_hwmon;
 330         }
 331
 332         /* 10Xpress has fixed-function LED pins, so there is no board-specific
 333          * blink code. */
 334         efx->board_info.blink = tenxpress_phy_blink;
 335
 336         efx->board_info.monitor = sfe4001_check_hw;
 337         efx->board_info.fini = sfe4001_fini;
 338
 339         if (efx->phy_mode & PHY_MODE_SPECIAL) {
 340                 /* PHY won't generate a 156.25 MHz clock and MAC stats fetch
 341                  * will fail. */
 342                 efx_stats_disable(efx);
 343         }
 344         rc = sfe4001_poweron(efx);
 345         if (rc)
 346                 goto fail_ioexp;
 347
 348         rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
 349         if (rc)
 350                 goto fail_on;
 351
 352         EFX_INFO(efx, "PHY is powered on\n");
 353         return 0;
 354
 355 fail_on:
 356         sfe4001_poweroff(efx);
 357 fail_ioexp:
 358         i2c_unregister_device(efx->board_info.ioexp_client);
 359 fail_hwmon:
 360         i2c_unregister_device(efx->board_info.hwmon_client);
 361         return rc;
 362 }
 363
 364 static int sfn4111t_check_hw(struct efx_nic *efx)
 365 {
 366         s32 status;
 367
 368         /* If XAUI link is up then do not monitor */
 369         if (EFX_WORKAROUND_7884(efx) && efx->mac_up)
 370                 return 0;
 371
 372         /* Test LHIGH, RHIGH, FAULT, EOT and IOT alarms */
 373         status = i2c_smbus_read_byte_data(efx->board_info.hwmon_client,
 374                                           MAX664X_REG_RSL);
 375         if (status < 0)
 376                 return -EIO;
 377         if (status & 0x57)
 378                 return -ERANGE;
 379         return 0;
 380 }
 381
 382 static void sfn4111t_fini(struct efx_nic *efx)
 383 {
 384         EFX_INFO(efx, "%s\n", __func__);
 385
 386         device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
 387         i2c_unregister_device(efx->board_info.hwmon_client);
 388 }
 389
 390 static struct i2c_board_info sfn4111t_a0_hwmon_info = {
 391         I2C_BOARD_INFO("max6647", 0x4e),
 392         .irq            = -1,
 393 };
 394
 395 static struct i2c_board_info sfn4111t_r5_hwmon_info = {
 396         I2C_BOARD_INFO("max6646", 0x4d),
 397         .irq            = -1,
 398 };
 399
 400 int sfn4111t_init(struct efx_nic *efx)
 401 {
 402         int rc;
 403
 404         efx->board_info.hwmon_client =
 405                 i2c_new_device(&efx->i2c_adap,
 406                                (efx->board_info.minor < 5) ?
 407                                &sfn4111t_a0_hwmon_info :
 408                                &sfn4111t_r5_hwmon_info);
 409         if (!efx->board_info.hwmon_client)
 410                 return -EIO;
 411
 412         efx->board_info.blink = tenxpress_phy_blink;
 413         efx->board_info.monitor = sfn4111t_check_hw;
 414         efx->board_info.fini = sfn4111t_fini;
 415
 416         rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
 417         if (rc)
 418                 goto fail_hwmon;
 419
 420         if (efx->phy_mode & PHY_MODE_SPECIAL) {
 421                 efx_stats_disable(efx);
 422                 sfn4111t_reset(efx);
 423         }
 424
 425         return 0;
 426
 427 fail_hwmon:
 428         i2c_unregister_device(efx->board_info.hwmon_client);
 429         return rc;
 430 }