kernel/2.6.29.6-aldebaran-rt/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 "net_driver.h"
  28 #include "efx.h"
  29 #include "phy.h"
  30 #include "boards.h"
  31 #include "falcon.h"
  32 #include "falcon_hwdefs.h"
  33 #include "falcon_io.h"
  34 #include "mac.h"
  35 #include "workarounds.h"
  36
  37 /**************************************************************************
  38  *
  39  * I2C IO Expander device
  40  *
  41  **************************************************************************/
  42 #define PCA9539 0x74
  43
  44 #define P0_IN 0x00
  45 #define P0_OUT 0x02
  46 #define P0_INVERT 0x04
  47 #define P0_CONFIG 0x06
  48
  49 #define P0_EN_1V0X_LBN 0
  50 #define P0_EN_1V0X_WIDTH 1
  51 #define P0_EN_1V2_LBN 1
  52 #define P0_EN_1V2_WIDTH 1
  53 #define P0_EN_2V5_LBN 2
  54 #define P0_EN_2V5_WIDTH 1
  55 #define P0_EN_3V3X_LBN 3
  56 #define P0_EN_3V3X_WIDTH 1
  57 #define P0_EN_5V_LBN 4
  58 #define P0_EN_5V_WIDTH 1
  59 #define P0_SHORTEN_JTAG_LBN 5
  60 #define P0_SHORTEN_JTAG_WIDTH 1
  61 #define P0_X_TRST_LBN 6
  62 #define P0_X_TRST_WIDTH 1
  63 #define P0_DSP_RESET_LBN 7
  64 #define P0_DSP_RESET_WIDTH 1
  65
  66 #define P1_IN 0x01
  67 #define P1_OUT 0x03
  68 #define P1_INVERT 0x05
  69 #define P1_CONFIG 0x07
  70
  71 #define P1_AFE_PWD_LBN 0
  72 #define P1_AFE_PWD_WIDTH 1
  73 #define P1_DSP_PWD25_LBN 1
  74 #define P1_DSP_PWD25_WIDTH 1
  75 #define P1_RESERVED_LBN 2
  76 #define P1_RESERVED_WIDTH 2
  77 #define P1_SPARE_LBN 4
  78 #define P1_SPARE_WIDTH 4
  79
  80 /* Temperature Sensor */
  81 #define MAX664X_REG_RSL         0x02
  82 #define MAX664X_REG_WLHO        0x0B
  83
  84 static void sfe4001_poweroff(struct efx_nic *efx)
  85 {
  86         struct i2c_client *ioexp_client = efx->board_info.ioexp_client;
  87         struct i2c_client *hwmon_client = efx->board_info.hwmon_client;
  88
  89         /* Turn off all power rails and disable outputs */
  90         i2c_smbus_write_byte_data(ioexp_client, P0_OUT, 0xff);
  91         i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG, 0xff);
  92         i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0xff);
  93
  94         /* Clear any over-temperature alert */
  95         i2c_smbus_read_byte_data(hwmon_client, MAX664X_REG_RSL);
  96 }
  97
  98 static int sfe4001_poweron(struct efx_nic *efx)
  99 {
 100         struct i2c_client *hwmon_client = efx->board_info.hwmon_client;
 101         struct i2c_client *ioexp_client = efx->board_info.ioexp_client;
 102         unsigned int i, j;
 103         int rc;
 104         u8 out;
 105
 106         /* Clear any previous over-temperature alert */
 107         rc = i2c_smbus_read_byte_data(hwmon_client, MAX664X_REG_RSL);
 108         if (rc < 0)
 109                 return rc;
 110
 111         /* Enable port 0 and port 1 outputs on IO expander */
 112         rc = i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0x00);
 113         if (rc)
 114                 return rc;
 115         rc = i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG,
 116                                        0xff & ~(1 << P1_SPARE_LBN));
 117         if (rc)
 118                 goto fail_on;
 119
 120         /* If PHY power is on, turn it all off and wait 1 second to
 121          * ensure a full reset.
 122          */
 123         rc = i2c_smbus_read_byte_data(ioexp_client, P0_OUT);
 124         if (rc < 0)
 125                 goto fail_on;
 126         out = 0xff & ~((0 << P0_EN_1V2_LBN) | (0 << P0_EN_2V5_LBN) |
 127                        (0 << P0_EN_3V3X_LBN) | (0 << P0_EN_5V_LBN) |
 128                        (0 << P0_EN_1V0X_LBN));
 129         if (rc != out) {
 130                 EFX_INFO(efx, "power-cycling PHY\n");
 131                 rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
 132                 if (rc)
 133                         goto fail_on;
 134                 schedule_timeout_uninterruptible(HZ);
 135         }
 136
 137         for (i = 0; i < 20; ++i) {
 138                 /* Turn on 1.2V, 2.5V, 3.3V and 5V power rails */
 139                 out = 0xff & ~((1 << P0_EN_1V2_LBN) | (1 << P0_EN_2V5_LBN) |
 140                                (1 << P0_EN_3V3X_LBN) | (1 << P0_EN_5V_LBN) |
 141                                (1 << P0_X_TRST_LBN));
 142                 if (efx->phy_mode & PHY_MODE_SPECIAL)
 143                         out |= 1 << P0_EN_3V3X_LBN;
 144
 145                 rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
 146                 if (rc)
 147                         goto fail_on;
 148                 msleep(10);
 149
 150                 /* Turn on 1V power rail */
 151                 out &= ~(1 << P0_EN_1V0X_LBN);
 152                 rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
 153                 if (rc)
 154                         goto fail_on;
 155
 156                 EFX_INFO(efx, "waiting for DSP boot (attempt %d)...\n", i);
 157
 158                 /* In flash config mode, DSP does not turn on AFE, so
 159                  * just wait 1 second.
 160                  */
 161                 if (efx->phy_mode & PHY_MODE_SPECIAL) {
 162                         schedule_timeout_uninterruptible(HZ);
 163                         return 0;
 164                 }
 165
 166                 for (j = 0; j < 10; ++j) {
 167                         msleep(100);
 168
 169                         /* Check DSP has asserted AFE power line */
 170                         rc = i2c_smbus_read_byte_data(ioexp_client, P1_IN);
 171                         if (rc < 0)
 172                                 goto fail_on;
 173                         if (rc & (1 << P1_AFE_PWD_LBN))
 174                                 return 0;
 175                 }
 176         }
 177
 178         EFX_INFO(efx, "timed out waiting for DSP boot\n");
 179         rc = -ETIMEDOUT;
 180 fail_on:
 181         sfe4001_poweroff(efx);
 182         return rc;
 183 }
 184
 185 static int sfn4111t_reset(struct efx_nic *efx)
 186 {
 187         efx_oword_t reg;
 188
 189         /* GPIO 3 and the GPIO register are shared with I2C, so block that */
 190         mutex_lock(&efx->i2c_adap.bus_lock);
 191
 192         /* Pull RST_N (GPIO 2) low then let it up again, setting the
 193          * FLASH_CFG_1 strap (GPIO 3) appropriately.  Only change the
 194          * output enables; the output levels should always be 0 (low)
 195          * and we rely on external pull-ups. */
 196         falcon_read(efx, &reg, GPIO_CTL_REG_KER);
 197         EFX_SET_OWORD_FIELD(reg, GPIO2_OEN, true);
 198         falcon_write(efx, &reg, GPIO_CTL_REG_KER);
 199         msleep(1000);
 200         EFX_SET_OWORD_FIELD(reg, GPIO2_OEN, false);
 201         EFX_SET_OWORD_FIELD(reg, GPIO3_OEN,
 202                             !!(efx->phy_mode & PHY_MODE_SPECIAL));
 203         falcon_write(efx, &reg, GPIO_CTL_REG_KER);
 204         msleep(1);
 205
 206         mutex_unlock(&efx->i2c_adap.bus_lock);
 207
 208         ssleep(1);
 209         return 0;
 210 }
 211
 212 static ssize_t show_phy_flash_cfg(struct device *dev,
 213                                   struct device_attribute *attr, char *buf)
 214 {
 215         struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
 216         return sprintf(buf, "%d\n", !!(efx->phy_mode & PHY_MODE_SPECIAL));
 217 }
 218
 219 static ssize_t set_phy_flash_cfg(struct device *dev,
 220                                  struct device_attribute *attr,
 221                                  const char *buf, size_t count)
 222 {
 223         struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
 224         enum efx_phy_mode old_mode, new_mode;
 225         int err;
 226
 227         rtnl_lock();
 228         old_mode = efx->phy_mode;
 229         if (count == 0 || *buf == '0')
 230                 new_mode = old_mode & ~PHY_MODE_SPECIAL;
 231         else
 232                 new_mode = PHY_MODE_SPECIAL;
 233         if (old_mode == new_mode) {
 234                 err = 0;
 235         } else if (efx->state != STATE_RUNNING || netif_running(efx->net_dev)) {
 236                 err = -EBUSY;
 237         } else {
 238                 /* Reset the PHY, reconfigure the MAC and enable/disable
 239                  * MAC stats accordingly. */
 240                 efx->phy_mode = new_mode;
 241                 if (new_mode & PHY_MODE_SPECIAL)
 242                         efx_stats_disable(efx);
 243                 if (efx->board_info.type == EFX_BOARD_SFE4001)
 244                         err = sfe4001_poweron(efx);
 245                 else
 246                         err = sfn4111t_reset(efx);
 247                 efx_reconfigure_port(efx);
 248                 if (!(new_mode & PHY_MODE_SPECIAL))
 249                         efx_stats_enable(efx);
 250         }
 251         rtnl_unlock();
 252
 253         return err ? err : count;
 254 }
 255
 256 static DEVICE_ATTR(phy_flash_cfg, 0644, show_phy_flash_cfg, set_phy_flash_cfg);
 257
 258 static void sfe4001_fini(struct efx_nic *efx)
 259 {
 260         EFX_INFO(efx, "%s\n", __func__);
 261
 262         device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
 263         sfe4001_poweroff(efx);
 264         i2c_unregister_device(efx->board_info.ioexp_client);
 265         i2c_unregister_device(efx->board_info.hwmon_client);
 266 }
 267
 268 static int sfe4001_check_hw(struct efx_nic *efx)
 269 {
 270         s32 status;
 271
 272         /* If XAUI link is up then do not monitor */
 273         if (EFX_WORKAROUND_7884(efx) && efx->mac_up)
 274                 return 0;
 275
 276         /* Check the powered status of the PHY. Lack of power implies that
 277          * the MAX6647 has shut down power to it, probably due to a temp.
 278          * alarm. Reading the power status rather than the MAX6647 status
 279          * directly because the later is read-to-clear and would thus
 280          * start to power up the PHY again when polled, causing us to blip
 281          * the power undesirably.
 282          * We know we can read from the IO expander because we did
 283          * it during power-on. Assume failure now is bad news. */
 284         status = i2c_smbus_read_byte_data(efx->board_info.ioexp_client, P1_IN);
 285         if (status >= 0 &&
 286             (status & ((1 << P1_AFE_PWD_LBN) | (1 << P1_DSP_PWD25_LBN))) != 0)
 287                 return 0;
 288
 289         /* Use board power control, not PHY power control */
 290         sfe4001_poweroff(efx);
 291         efx->phy_mode = PHY_MODE_OFF;
 292
 293         return (status < 0) ? -EIO : -ERANGE;
 294 }
 295
 296 static struct i2c_board_info sfe4001_hwmon_info = {
 297         I2C_BOARD_INFO("max6647", 0x4e),
 298         .irq            = -1,
 299 };
 300
 301 /* This board uses an I2C expander to provider power to the PHY, which needs to
 302  * be turned on before the PHY can be used.
 303  * Context: Process context, rtnl lock held
 304  */
 305 int sfe4001_init(struct efx_nic *efx)
 306 {
 307         int rc;
 308
 309 #if defined(CONFIG_SENSORS_LM90) || defined(CONFIG_SENSORS_LM90_MODULE)
 310         efx->board_info.hwmon_client =
 311                 i2c_new_device(&efx->i2c_adap, &sfe4001_hwmon_info);
 312 #else
 313         efx->board_info.hwmon_client =
 314                 i2c_new_dummy(&efx->i2c_adap, sfe4001_hwmon_info.addr);
 315 #endif
 316         if (!efx->board_info.hwmon_client)
 317                 return -EIO;
 318
 319         /* Raise board/PHY high limit from 85 to 90 degrees Celsius */
 320         rc = i2c_smbus_write_byte_data(efx->board_info.hwmon_client,
 321                                        MAX664X_REG_WLHO, 90);
 322         if (rc)
 323                 goto fail_hwmon;
 324
 325         efx->board_info.ioexp_client = i2c_new_dummy(&efx->i2c_adap, PCA9539);
 326         if (!efx->board_info.ioexp_client) {
 327                 rc = -EIO;
 328                 goto fail_hwmon;
 329         }
 330
 331         /* 10Xpress has fixed-function LED pins, so there is no board-specific
 332          * blink code. */
 333         efx->board_info.blink = tenxpress_phy_blink;
 334
 335         efx->board_info.monitor = sfe4001_check_hw;
 336         efx->board_info.fini = sfe4001_fini;
 337
 338         if (efx->phy_mode & PHY_MODE_SPECIAL) {
 339                 /* PHY won't generate a 156.25 MHz clock and MAC stats fetch
 340                  * will fail. */
 341                 efx_stats_disable(efx);
 342         }
 343         rc = sfe4001_poweron(efx);
 344         if (rc)
 345                 goto fail_ioexp;
 346
 347         rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
 348         if (rc)
 349                 goto fail_on;
 350
 351         EFX_INFO(efx, "PHY is powered on\n");
 352         return 0;
 353
 354 fail_on:
 355         sfe4001_poweroff(efx);
 356 fail_ioexp:
 357         i2c_unregister_device(efx->board_info.ioexp_client);
 358 fail_hwmon:
 359         i2c_unregister_device(efx->board_info.hwmon_client);
 360         return rc;
 361 }
 362
 363 static int sfn4111t_check_hw(struct efx_nic *efx)
 364 {
 365         s32 status;
 366
 367         /* If XAUI link is up then do not monitor */
 368         if (EFX_WORKAROUND_7884(efx) && efx->mac_up)
 369                 return 0;
 370
 371         /* Test LHIGH, RHIGH, FAULT, EOT and IOT alarms */
 372         status = i2c_smbus_read_byte_data(efx->board_info.hwmon_client,
 373                                           MAX664X_REG_RSL);
 374         if (status < 0)
 375                 return -EIO;
 376         if (status & 0x57)
 377                 return -ERANGE;
 378         return 0;
 379 }
 380
 381 static void sfn4111t_fini(struct efx_nic *efx)
 382 {
 383         EFX_INFO(efx, "%s\n", __func__);
 384
 385         device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
 386         i2c_unregister_device(efx->board_info.hwmon_client);
 387 }
 388
 389 static struct i2c_board_info sfn4111t_a0_hwmon_info = {
 390         I2C_BOARD_INFO("max6647", 0x4e),
 391         .irq            = -1,
 392 };
 393
 394 static struct i2c_board_info sfn4111t_r5_hwmon_info = {
 395         I2C_BOARD_INFO("max6646", 0x4d),
 396         .irq            = -1,
 397 };
 398
 399 int sfn4111t_init(struct efx_nic *efx)
 400 {
 401         int rc;
 402
 403         efx->board_info.hwmon_client =
 404                 i2c_new_device(&efx->i2c_adap,
 405                                (efx->board_info.minor < 5) ?
 406                                &sfn4111t_a0_hwmon_info :
 407                                &sfn4111t_r5_hwmon_info);
 408         if (!efx->board_info.hwmon_client)
 409                 return -EIO;
 410
 411         efx->board_info.blink = tenxpress_phy_blink;
 412         efx->board_info.monitor = sfn4111t_check_hw;
 413         efx->board_info.fini = sfn4111t_fini;
 414
 415         rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
 416         if (rc)
 417                 goto fail_hwmon;
 418
 419         if (efx->phy_mode & PHY_MODE_SPECIAL) {
 420                 efx_stats_disable(efx);
 421                 sfn4111t_reset(efx);
 422         }
 423
 424         return 0;
 425
 426 fail_hwmon:
 427         i2c_unregister_device(efx->board_info.hwmon_client);
 428         return rc;
 429 }