drivers/net/sfc/sfe4001.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2007 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 NIC: driver code for the PCA9539 I/O expander that
  12  * controls the PHY power rails, and for the MAX6647 temp. sensor used to check
  13  * the PHY
  14  */
  15 #include <linux/delay.h>
  16 #include "efx.h"
  17 #include "phy.h"
  18 #include "boards.h"
  19 #include "falcon.h"
  20 #include "falcon_hwdefs.h"
  21 #include "mac.h"
  22
  23 /**************************************************************************
  24  *
  25  * I2C IO Expander device
  26  *
  27  **************************************************************************/
  28 #define PCA9539 0x74
  29
  30 #define P0_IN 0x00
  31 #define P0_OUT 0x02
  32 #define P0_INVERT 0x04
  33 #define P0_CONFIG 0x06
  34
  35 #define P0_EN_1V0X_LBN 0
  36 #define P0_EN_1V0X_WIDTH 1
  37 #define P0_EN_1V2_LBN 1
  38 #define P0_EN_1V2_WIDTH 1
  39 #define P0_EN_2V5_LBN 2
  40 #define P0_EN_2V5_WIDTH 1
  41 #define P0_EN_3V3X_LBN 3
  42 #define P0_EN_3V3X_WIDTH 1
  43 #define P0_EN_5V_LBN 4
  44 #define P0_EN_5V_WIDTH 1
  45 #define P0_SHORTEN_JTAG_LBN 5
  46 #define P0_SHORTEN_JTAG_WIDTH 1
  47 #define P0_X_TRST_LBN 6
  48 #define P0_X_TRST_WIDTH 1
  49 #define P0_DSP_RESET_LBN 7
  50 #define P0_DSP_RESET_WIDTH 1
  51
  52 #define P1_IN 0x01
  53 #define P1_OUT 0x03
  54 #define P1_INVERT 0x05
  55 #define P1_CONFIG 0x07
  56
  57 #define P1_AFE_PWD_LBN 0
  58 #define P1_AFE_PWD_WIDTH 1
  59 #define P1_DSP_PWD25_LBN 1
  60 #define P1_DSP_PWD25_WIDTH 1
  61 #define P1_RESERVED_LBN 2
  62 #define P1_RESERVED_WIDTH 2
  63 #define P1_SPARE_LBN 4
  64 #define P1_SPARE_WIDTH 4
  65
  66
  67 /**************************************************************************
  68  *
  69  * Temperature Sensor
  70  *
  71  **************************************************************************/
  72 #define MAX6647 0x4e
  73
  74 #define RLTS    0x00
  75 #define RLTE    0x01
  76 #define RSL     0x02
  77 #define RCL     0x03
  78 #define RCRA    0x04
  79 #define RLHN    0x05
  80 #define RLLI    0x06
  81 #define RRHI    0x07
  82 #define RRLS    0x08
  83 #define WCRW    0x0a
  84 #define WLHO    0x0b
  85 #define WRHA    0x0c
  86 #define WRLN    0x0e
  87 #define OSHT    0x0f
  88 #define REET    0x10
  89 #define RIET    0x11
  90 #define RWOE    0x19
  91 #define RWOI    0x20
  92 #define HYS     0x21
  93 #define QUEUE   0x22
  94 #define MFID    0xfe
  95 #define REVID   0xff
  96
  97 /* Status bits */
  98 #define MAX6647_BUSY    (1 << 7)        /* ADC is converting */
  99 #define MAX6647_LHIGH   (1 << 6)        /* Local high temp. alarm */
 100 #define MAX6647_LLOW    (1 << 5)        /* Local low temp. alarm */
 101 #define MAX6647_RHIGH   (1 << 4)        /* Remote high temp. alarm */
 102 #define MAX6647_RLOW    (1 << 3)        /* Remote low temp. alarm */
 103 #define MAX6647_FAULT   (1 << 2)        /* DXN/DXP short/open circuit */
 104 #define MAX6647_EOT     (1 << 1)        /* Remote junction overtemp. */
 105 #define MAX6647_IOT     (1 << 0)        /* Local junction overtemp. */
 106
 107 static const u8 xgphy_max_temperature = 90;
 108
 109 static void sfe4001_poweroff(struct efx_nic *efx)
 110 {
 111         struct i2c_client *ioexp_client = efx->board_info.ioexp_client;
 112         struct i2c_client *hwmon_client = efx->board_info.hwmon_client;
 113
 114         /* Turn off all power rails and disable outputs */
 115         i2c_smbus_write_byte_data(ioexp_client, P0_OUT, 0xff);
 116         i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG, 0xff);
 117         i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0xff);
 118
 119         /* Clear any over-temperature alert */
 120         i2c_smbus_read_byte_data(hwmon_client, RSL);
 121 }
 122
 123 static void sfe4001_fini(struct efx_nic *efx)
 124 {
 125         EFX_INFO(efx, "%s\n", __func__);
 126
 127         sfe4001_poweroff(efx);
 128         i2c_unregister_device(efx->board_info.ioexp_client);
 129         i2c_unregister_device(efx->board_info.hwmon_client);
 130 }
 131
 132 /* The P0_EN_3V3X line on SFE4001 boards (from A2 onward) is connected
 133  * to the FLASH_CFG_1 input on the DSP.  We must keep it high at power-
 134  * up to allow writing the flash (done through MDIO from userland).
 135  */
 136 unsigned int sfe4001_phy_flash_cfg;
 137 module_param_named(phy_flash_cfg, sfe4001_phy_flash_cfg, uint, 0444);
 138 MODULE_PARM_DESC(phy_flash_cfg,
 139                  "Force PHY to enter flash configuration mode");
 140
 141 /* This board uses an I2C expander to provider power to the PHY, which needs to
 142  * be turned on before the PHY can be used.
 143  * Context: Process context, rtnl lock held
 144  */
 145 int sfe4001_init(struct efx_nic *efx)
 146 {
 147         struct i2c_client *hwmon_client, *ioexp_client;
 148         unsigned int count;
 149         int rc;
 150         u8 out;
 151         efx_dword_t reg;
 152
 153         hwmon_client = i2c_new_dummy(&efx->i2c_adap, MAX6647);
 154         if (!hwmon_client)
 155                 return -EIO;
 156         efx->board_info.hwmon_client = hwmon_client;
 157
 158         ioexp_client = i2c_new_dummy(&efx->i2c_adap, PCA9539);
 159         if (!ioexp_client) {
 160                 rc = -EIO;
 161                 goto fail_hwmon;
 162         }
 163         efx->board_info.ioexp_client = ioexp_client;
 164
 165         /* 10Xpress has fixed-function LED pins, so there is no board-specific
 166          * blink code. */
 167         efx->board_info.blink = tenxpress_phy_blink;
 168
 169         /* Ensure that XGXS and XAUI SerDes are held in reset */
 170         EFX_POPULATE_DWORD_7(reg, XX_PWRDNA_EN, 1,
 171                              XX_PWRDNB_EN, 1,
 172                              XX_RSTPLLAB_EN, 1,
 173                              XX_RESETA_EN, 1,
 174                              XX_RESETB_EN, 1,
 175                              XX_RSTXGXSRX_EN, 1,
 176                              XX_RSTXGXSTX_EN, 1);
 177         falcon_xmac_writel(efx, &reg, XX_PWR_RST_REG_MAC);
 178         udelay(10);
 179
 180         efx->board_info.fini = sfe4001_fini;
 181
 182         /* Set DSP over-temperature alert threshold */
 183         EFX_INFO(efx, "DSP cut-out at %dC\n", xgphy_max_temperature);
 184         rc = i2c_smbus_write_byte_data(hwmon_client, WLHO,
 185                                        xgphy_max_temperature);
 186         if (rc)
 187                 goto fail_ioexp;
 188
 189         /* Read it back and verify */
 190         rc = i2c_smbus_read_byte_data(hwmon_client, RLHN);
 191         if (rc < 0)
 192                 goto fail_ioexp;
 193         if (rc != xgphy_max_temperature) {
 194                 rc = -EFAULT;
 195                 goto fail_ioexp;
 196         }
 197
 198         /* Clear any previous over-temperature alert */
 199         rc = i2c_smbus_read_byte_data(hwmon_client, RSL);
 200         if (rc < 0)
 201                 goto fail_ioexp;
 202
 203         /* Enable port 0 and port 1 outputs on IO expander */
 204         rc = i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0x00);
 205         if (rc)
 206                 goto fail_ioexp;
 207         rc = i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG,
 208                                        0xff & ~(1 << P1_SPARE_LBN));
 209         if (rc)
 210                 goto fail_on;
 211
 212         /* Turn all power off then wait 1 sec. This ensures PHY is reset */
 213         out = 0xff & ~((0 << P0_EN_1V2_LBN) | (0 << P0_EN_2V5_LBN) |
 214                        (0 << P0_EN_3V3X_LBN) | (0 << P0_EN_5V_LBN) |
 215                        (0 << P0_EN_1V0X_LBN));
 216         rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
 217         if (rc)
 218                 goto fail_on;
 219
 220         schedule_timeout_uninterruptible(HZ);
 221         count = 0;
 222         do {
 223                 /* Turn on 1.2V, 2.5V, 3.3V and 5V power rails */
 224                 out = 0xff & ~((1 << P0_EN_1V2_LBN) | (1 << P0_EN_2V5_LBN) |
 225                                (1 << P0_EN_3V3X_LBN) | (1 << P0_EN_5V_LBN) |
 226                                (1 << P0_X_TRST_LBN));
 227                 if (sfe4001_phy_flash_cfg)
 228                         out |= 1 << P0_EN_3V3X_LBN;
 229
 230                 rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
 231                 if (rc)
 232                         goto fail_on;
 233                 msleep(10);
 234
 235                 /* Turn on 1V power rail */
 236                 out &= ~(1 << P0_EN_1V0X_LBN);
 237                 rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
 238                 if (rc)
 239                         goto fail_on;
 240
 241                 EFX_INFO(efx, "waiting for power (attempt %d)...\n", count);
 242
 243                 schedule_timeout_uninterruptible(HZ);
 244
 245                 /* Check DSP is powered */
 246                 rc = i2c_smbus_read_byte_data(ioexp_client, P1_IN);
 247                 if (rc < 0)
 248                         goto fail_on;
 249                 if (rc & (1 << P1_AFE_PWD_LBN))
 250                         goto done;
 251
 252                 /* DSP doesn't look powered in flash config mode */
 253                 if (sfe4001_phy_flash_cfg)
 254                         goto done;
 255         } while (++count < 20);
 256
 257         EFX_INFO(efx, "timed out waiting for power\n");
 258         rc = -ETIMEDOUT;
 259         goto fail_on;
 260
 261 done:
 262         EFX_INFO(efx, "PHY is powered on\n");
 263         return 0;
 264
 265 fail_on:
 266         sfe4001_poweroff(efx);
 267 fail_ioexp:
 268         i2c_unregister_device(ioexp_client);
 269 fail_hwmon:
 270         i2c_unregister_device(hwmon_client);
 271         return rc;
 272 }