drivers/staging/et131x/et1310_eeprom.c

   1 /*
   2  * Agere Systems Inc.
   3  * 10/100/1000 Base-T Ethernet Driver for the ET1301 and ET131x series MACs
   4  *
   5  * Copyright © 2005 Agere Systems Inc.
   6  * All rights reserved.
   7  *   http://www.agere.com
   8  *
   9  *------------------------------------------------------------------------------
  10  *
  11  * et1310_eeprom.c - Code used to access the device's EEPROM
  12  *
  13  *------------------------------------------------------------------------------
  14  *
  15  * SOFTWARE LICENSE
  16  *
  17  * This software is provided subject to the following terms and conditions,
  18  * which you should read carefully before using the software.  Using this
  19  * software indicates your acceptance of these terms and conditions.  If you do
  20  * not agree with these terms and conditions, do not use the software.
  21  *
  22  * Copyright © 2005 Agere Systems Inc.
  23  * All rights reserved.
  24  *
  25  * Redistribution and use in source or binary forms, with or without
  26  * modifications, are permitted provided that the following conditions are met:
  27  *
  28  * . Redistributions of source code must retain the above copyright notice, this
  29  *    list of conditions and the following Disclaimer as comments in the code as
  30  *    well as in the documentation and/or other materials provided with the
  31  *    distribution.
  32  *
  33  * . Redistributions in binary form must reproduce the above copyright notice,
  34  *    this list of conditions and the following Disclaimer in the documentation
  35  *    and/or other materials provided with the distribution.
  36  *
  37  * . Neither the name of Agere Systems Inc. nor the names of the contributors
  38  *    may be used to endorse or promote products derived from this software
  39  *    without specific prior written permission.
  40  *
  41  * Disclaimer
  42  *
  43  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  44  * INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
  45  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  ANY
  46  * USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
  47  * RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS BE LIABLE FOR ANY
  48  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  49  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  50  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  51  * ON ANY THEORY OF LIABILITY, INCLUDING, BUT NOT LIMITED TO, CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  53  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  54  * DAMAGE.
  55  *
  56  */
  57
  58 #include "et131x_version.h"
  59 #include "et131x_defs.h"
  60
  61 #include <linux/pci.h>
  62 #include <linux/init.h>
  63 #include <linux/module.h>
  64 #include <linux/types.h>
  65 #include <linux/kernel.h>
  66
  67 #include <linux/sched.h>
  68 #include <linux/ptrace.h>
  69 #include <linux/ctype.h>
  70 #include <linux/string.h>
  71 #include <linux/timer.h>
  72 #include <linux/interrupt.h>
  73 #include <linux/in.h>
  74 #include <linux/delay.h>
  75 #include <linux/bitops.h>
  76 #include <linux/io.h>
  77 #include <asm/system.h>
  78
  79 #include <linux/netdevice.h>
  80 #include <linux/etherdevice.h>
  81 #include <linux/skbuff.h>
  82 #include <linux/if_arp.h>
  83 #include <linux/ioport.h>
  84
  85 #include "et1310_phy.h"
  86 #include "et131x_adapter.h"
  87 #include "et131x.h"
  88
  89 /*
  90  * EEPROM Defines
  91  */
  92
  93 /* LBCIF Register Groups (addressed via 32-bit offsets) */
  94 #define LBCIF_DWORD0_GROUP       0xAC
  95 #define LBCIF_DWORD1_GROUP       0xB0
  96
  97 /* LBCIF Registers (addressed via 8-bit offsets) */
  98 #define LBCIF_ADDRESS_REGISTER   0xAC
  99 #define LBCIF_DATA_REGISTER      0xB0
 100 #define LBCIF_CONTROL_REGISTER   0xB1
 101 #define LBCIF_STATUS_REGISTER    0xB2
 102
 103 /* LBCIF Control Register Bits */
 104 #define LBCIF_CONTROL_SEQUENTIAL_READ   0x01
 105 #define LBCIF_CONTROL_PAGE_WRITE        0x02
 106 #define LBCIF_CONTROL_EEPROM_RELOAD     0x08
 107 #define LBCIF_CONTROL_TWO_BYTE_ADDR     0x20
 108 #define LBCIF_CONTROL_I2C_WRITE         0x40
 109 #define LBCIF_CONTROL_LBCIF_ENABLE      0x80
 110
 111 /* LBCIF Status Register Bits */
 112 #define LBCIF_STATUS_PHY_QUEUE_AVAIL    0x01
 113 #define LBCIF_STATUS_I2C_IDLE           0x02
 114 #define LBCIF_STATUS_ACK_ERROR          0x04
 115 #define LBCIF_STATUS_GENERAL_ERROR      0x08
 116 #define LBCIF_STATUS_CHECKSUM_ERROR     0x40
 117 #define LBCIF_STATUS_EEPROM_PRESENT     0x80
 118
 119 /* Miscellaneous Constraints */
 120 #define MAX_NUM_REGISTER_POLLS          1000
 121 #define MAX_NUM_WRITE_RETRIES           2
 122
 123 static int eeprom_wait_ready(struct pci_dev *pdev, u32 *status)
 124 {
 125         u32 reg;
 126         int i;
 127
 128         /*
 129          * 1. Check LBCIF Status Register for bits 6 & 3:2 all equal to 0 and
 130          *    bits 7,1:0 both equal to 1, at least once after reset.
 131          *    Subsequent operations need only to check that bits 1:0 are equal
 132          *    to 1 prior to starting a single byte read/write
 133          */
 134
 135         for (i = 0; i < MAX_NUM_REGISTER_POLLS; i++) {
 136                 /* Read registers grouped in DWORD1 */
 137                 if (pci_read_config_dword(pdev, LBCIF_DWORD1_GROUP, &reg))
 138                         return -EIO;
 139
 140                 /* I2C idle and Phy Queue Avail both true */
 141                 if ((reg & 0x3000) == 0x3000) {
 142                         if (status)
 143                                 *status = reg;
 144                         return reg & 0xFF;
 145                 }
 146         }
 147         return -ETIMEDOUT;
 148 }
 149
 150
 151 /**
 152  * eeprom_write - Write a byte to the ET1310's EEPROM
 153  * @etdev: pointer to our private adapter structure
 154  * @addr: the address to write
 155  * @data: the value to write
 156  *
 157  * Returns 1 for a successful write.
 158  */
 159 static int eeprom_write(struct et131x_adapter *etdev, u32 addr, u8 data)
 160 {
 161         struct pci_dev *pdev = etdev->pdev;
 162         int index = 0;
 163         int retries;
 164         int err = 0;
 165         int i2c_wack = 0;
 166         int writeok = 0;
 167         u32 status;
 168         u32 val = 0;
 169
 170         /*
 171          * For an EEPROM, an I2C single byte write is defined as a START
 172          * condition followed by the device address, EEPROM address, one byte
 173          * of data and a STOP condition.  The STOP condition will trigger the
 174          * EEPROM's internally timed write cycle to the nonvolatile memory.
 175          * All inputs are disabled during this write cycle and the EEPROM will
 176          * not respond to any access until the internal write is complete.
 177          */
 178
 179         err = eeprom_wait_ready(pdev, NULL);
 180         if (err)
 181                 return err;
 182
 183          /*
 184          * 2. Write to the LBCIF Control Register:  bit 7=1, bit 6=1, bit 3=0,
 185          *    and bits 1:0 both =0.  Bit 5 should be set according to the
 186          *    type of EEPROM being accessed (1=two byte addressing, 0=one
 187          *    byte addressing).
 188          */
 189         if (pci_write_config_byte(pdev, LBCIF_CONTROL_REGISTER,
 190                         LBCIF_CONTROL_LBCIF_ENABLE | LBCIF_CONTROL_I2C_WRITE))
 191                 return -EIO;
 192
 193         i2c_wack = 1;
 194
 195         /* Prepare EEPROM address for Step 3 */
 196
 197         for (retries = 0; retries < MAX_NUM_WRITE_RETRIES; retries++) {
 198                 /* Write the address to the LBCIF Address Register */
 199                 if (pci_write_config_dword(pdev, LBCIF_ADDRESS_REGISTER, addr))
 200                         break;
 201                 /*
 202                  * Write the data to the LBCIF Data Register (the I2C write
 203                  * will begin).
 204                  */
 205                 if (pci_write_config_byte(pdev, LBCIF_DATA_REGISTER, data))
 206                         break;
 207                 /*
 208                  * Monitor bit 1:0 of the LBCIF Status Register.  When bits
 209                  * 1:0 are both equal to 1, the I2C write has completed and the
 210                  * internal write cycle of the EEPROM is about to start.
 211                  * (bits 1:0 = 01 is a legal state while waiting from both
 212                  * equal to 1, but bits 1:0 = 10 is invalid and implies that
 213                  * something is broken).
 214                  */
 215                 err = eeprom_wait_ready(pdev, &status);
 216                 if (err < 0)
 217                         return 0;
 218
 219                 /*
 220                  * Check bit 3 of the LBCIF Status Register.  If  equal to 1,
 221                  * an error has occurred.Don't break here if we are revision
 222                  * 1, this is so we do a blind write for load bug.
 223                  */
 224                 if ((status & LBCIF_STATUS_GENERAL_ERROR)
 225                         && etdev->pdev->revision == 0)
 226                         break;
 227
 228                 /*
 229                  * Check bit 2 of the LBCIF Status Register.  If equal to 1 an
 230                  * ACK error has occurred on the address phase of the write.
 231                  * This could be due to an actual hardware failure or the
 232                  * EEPROM may still be in its internal write cycle from a
 233                  * previous write. This write operation was ignored and must be
 234                   *repeated later.
 235                  */
 236                 if (status & LBCIF_STATUS_ACK_ERROR) {
 237                         /*
 238                          * This could be due to an actual hardware failure
 239                          * or the EEPROM may still be in its internal write
 240                          * cycle from a previous write. This write operation
 241                          * was ignored and must be repeated later.
 242                          */
 243                         udelay(10);
 244                         continue;
 245                 }
 246
 247                 writeok = 1;
 248                 break;
 249         }
 250
 251         /*
 252          * Set bit 6 of the LBCIF Control Register = 0.
 253          */
 254         udelay(10);
 255
 256         while (i2c_wack) {
 257                 if (pci_write_config_byte(pdev, LBCIF_CONTROL_REGISTER,
 258                         LBCIF_CONTROL_LBCIF_ENABLE))
 259                         writeok = 0;
 260
 261                 /* Do read until internal ACK_ERROR goes away meaning write
 262                  * completed
 263                  */
 264                 do {
 265                         pci_write_config_dword(pdev,
 266                                                LBCIF_ADDRESS_REGISTER,
 267                                                addr);
 268                         do {
 269                                 pci_read_config_dword(pdev,
 270                                         LBCIF_DATA_REGISTER, &val);
 271                         } while ((val & 0x00010000) == 0);
 272                 } while (val & 0x00040000);
 273
 274                 if ((val & 0xFF00) != 0xC000 || index == 10000)
 275                         break;
 276                 index++;
 277         }
 278         return writeok ? 0 : -EIO;
 279 }
 280
 281 /**
 282  * eeprom_read - Read a byte from the ET1310's EEPROM
 283  * @etdev: pointer to our private adapter structure
 284  * @addr: the address from which to read
 285  * @pdata: a pointer to a byte in which to store the value of the read
 286  * @eeprom_id: the ID of the EEPROM
 287  * @addrmode: how the EEPROM is to be accessed
 288  *
 289  * Returns 1 for a successful read
 290  */
 291 static int eeprom_read(struct et131x_adapter *etdev, u32 addr, u8 *pdata)
 292 {
 293         struct pci_dev *pdev = etdev->pdev;
 294         int err;
 295         u32 status;
 296
 297         /*
 298          * A single byte read is similar to the single byte write, with the
 299          * exception of the data flow:
 300          */
 301
 302         err = eeprom_wait_ready(pdev, NULL);
 303         if (err)
 304                 return err;
 305         /*
 306          * Write to the LBCIF Control Register:  bit 7=1, bit 6=0, bit 3=0,
 307          * and bits 1:0 both =0.  Bit 5 should be set according to the type
 308          * of EEPROM being accessed (1=two byte addressing, 0=one byte
 309          * addressing).
 310          */
 311         if (pci_write_config_byte(pdev, LBCIF_CONTROL_REGISTER,
 312                                   LBCIF_CONTROL_LBCIF_ENABLE))
 313                 return -EIO;
 314         /*
 315          * Write the address to the LBCIF Address Register (I2C read will
 316          * begin).
 317          */
 318         if (pci_write_config_dword(pdev, LBCIF_ADDRESS_REGISTER, addr))
 319                 return -EIO;
 320         /*
 321          * Monitor bit 0 of the LBCIF Status Register.  When = 1, I2C read
 322          * is complete. (if bit 1 =1 and bit 0 stays = 0, a hardware failure
 323          * has occurred).
 324          */
 325         err = eeprom_wait_ready(pdev, &status);
 326         if (err < 0)
 327                 return err;
 328         /*
 329          * Regardless of error status, read data byte from LBCIF Data
 330          * Register.
 331          */
 332         *pdata = err;
 333         /*
 334          * Check bit 2 of the LBCIF Status Register.  If = 1,
 335          * then an error has occurred.
 336          */
 337         return (status & LBCIF_STATUS_ACK_ERROR) ? -EIO : 0;
 338 }
 339
 340 int et131x_init_eeprom(struct et131x_adapter *etdev)
 341 {
 342         struct pci_dev *pdev = etdev->pdev;
 343         u8 eestatus;
 344
 345         /* We first need to check the EEPROM Status code located at offset
 346          * 0xB2 of config space
 347          */
 348         pci_read_config_byte(pdev, ET1310_PCI_EEPROM_STATUS,
 349                                       &eestatus);
 350
 351         /* THIS IS A WORKAROUND:
 352          * I need to call this function twice to get my card in a
 353          * LG M1 Express Dual running. I tried also a msleep before this
 354          * function, because I thougth there could be some time condidions
 355          * but it didn't work. Call the whole function twice also work.
 356          */
 357         if (pci_read_config_byte(pdev, ET1310_PCI_EEPROM_STATUS, &eestatus)) {
 358                 dev_err(&pdev->dev,
 359                        "Could not read PCI config space for EEPROM Status\n");
 360                 return -EIO;
 361         }
 362
 363         /* Determine if the error(s) we care about are present. If they are
 364          * present we need to fail.
 365          */
 366         if (eestatus & 0x4C) {
 367                 int write_failed = 0;
 368                 if (pdev->revision == 0x01) {
 369                         int     i;
 370                         static const u8 eedata[4] = { 0xFE, 0x13, 0x10, 0xFF };
 371
 372                         /* Re-write the first 4 bytes if we have an eeprom
 373                          * present and the revision id is 1, this fixes the
 374                          * corruption seen with 1310 B Silicon
 375                          */
 376                         for (i = 0; i < 3; i++)
 377                                 if (eeprom_write(etdev, i, eedata[i]) < 0)
 378                                         write_failed = 1;
 379                 }
 380                 if (pdev->revision  != 0x01 || write_failed) {
 381                         dev_err(&pdev->dev,
 382                             "Fatal EEPROM Status Error - 0x%04x\n", eestatus);
 383
 384                         /* This error could mean that there was an error
 385                          * reading the eeprom or that the eeprom doesn't exist.
 386                          * We will treat each case the same and not try to
 387                          * gather additional information that normally would
 388                          * come from the eeprom, like MAC Address
 389                          */
 390                         etdev->has_eeprom = 0;
 391                         return -EIO;
 392                 }
 393         }
 394         etdev->has_eeprom = 1;
 395
 396         /* Read the EEPROM for information regarding LED behavior. Refer to
 397          * ET1310_phy.c, et131x_xcvr_init(), for its use.
 398          */
 399         eeprom_read(etdev, 0x70, &etdev->eeprom_data[0]);
 400         eeprom_read(etdev, 0x71, &etdev->eeprom_data[1]);
 401
 402         if (etdev->eeprom_data[0] != 0xcd)
 403                 /* Disable all optional features */
 404                 etdev->eeprom_data[1] = 0x00;
 405
 406         return 0;
 407 }