The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/nlm/board_eeprom.c

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    1 /*-
    2  * Copyright (c) 2003-2012 Broadcom Corporation
    3  * All Rights Reserved
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in
   13  *    the documentation and/or other materials provided with the
   14  *    distribution.
   15  * 
   16  * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
   23  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
   25  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
   26  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/10.3/sys/mips/nlm/board_eeprom.c 233542 2012-03-27 12:25:47Z jchandra $");
   31 #include <sys/param.h>
   32 #include <sys/endian.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/limits.h>
   36 #include <sys/bus.h>
   37 
   38 #include <dev/iicbus/iicoc.h>
   39 
   40 #include <mips/nlm/hal/haldefs.h>
   41 #include <mips/nlm/hal/iomap.h>
   42 #include <mips/nlm/hal/mips-extns.h> /* needed by board.h */
   43 
   44 #include <mips/nlm/board.h>
   45 
   46 /*
   47  * We have to read the EEPROM in early boot (now only for MAC addr)
   48  * but later for board information.  Use simple polled mode driver
   49  * for I2C
   50  */
   51 #define oc_read_reg(reg)        nlm_read_reg(eeprom_i2c_base, reg)
   52 #define oc_write_reg(reg, val)  nlm_write_reg(eeprom_i2c_base, reg, val)
   53 
   54 static uint64_t eeprom_i2c_base;
   55 
   56 static int
   57 oc_wait_on_status(uint8_t bit)
   58 {
   59         int tries = I2C_TIMEOUT;
   60         uint8_t status;
   61 
   62         do {
   63                 status = oc_read_reg(OC_I2C_STATUS_REG);
   64         } while ((status & bit) != 0 && --tries > 0);
   65 
   66         return (tries == 0 ? -1: 0);
   67 }
   68 
   69 static int
   70 oc_rd_cmd(uint8_t cmd)
   71 {
   72         uint8_t data;
   73 
   74                 oc_write_reg(OC_I2C_CMD_REG, cmd);
   75                 if (oc_wait_on_status(OC_STATUS_TIP) < 0)
   76                         return (-1);
   77 
   78         data = oc_read_reg(OC_I2C_DATA_REG);
   79         return (data);
   80 }
   81  
   82 static int
   83 oc_wr_cmd(uint8_t data, uint8_t cmd)
   84 {
   85         oc_write_reg(OC_I2C_DATA_REG, data);
   86         oc_write_reg(OC_I2C_CMD_REG, cmd);
   87 
   88         if (oc_wait_on_status(OC_STATUS_TIP) < 0)
   89                 return (-1);
   90         return (0);
   91 }
   92 
   93 int
   94 nlm_board_eeprom_read(int node, int bus, int addr, int offs, uint8_t *buf,
   95     int sz)
   96 {
   97         int rd, i;
   98         char *err = NULL;
   99 
  100         eeprom_i2c_base = nlm_pcicfg_base(XLP_IO_I2C_OFFSET(node, bus)) +
  101             XLP_IO_PCI_HDRSZ;
  102 
  103         if (oc_wait_on_status(OC_STATUS_BUSY) < 0) {
  104                 err = "Not idle";
  105                 goto err_exit;
  106         }
  107 
  108         /* write start */
  109         if (oc_wr_cmd(addr, OC_COMMAND_START)) {
  110                 err = "I2C write start failed.";
  111                 goto err_exit;
  112         }
  113 
  114         if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_NACK) {
  115                 err = "No ack after start";
  116                 goto err_exit_stop;
  117         }
  118 
  119         if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_AL) {
  120                 err = "I2C Bus Arbitration Lost";
  121                 goto err_exit_stop;
  122         }
  123 
  124         /* Write offset */
  125         if (oc_wr_cmd(offs, OC_COMMAND_WRITE)) {
  126                 err = "I2C write slave offset failed.";
  127                 goto err_exit_stop;
  128         }
  129 
  130         if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_NACK) {
  131                 err = "No ack after write";
  132                 goto err_exit_stop;
  133         }
  134 
  135         /* read start */
  136         if (oc_wr_cmd(addr | 1, OC_COMMAND_START)) {
  137                 err = "I2C read start failed.";
  138                 goto err_exit_stop;
  139         }
  140 
  141         if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_NACK) {
  142                 err = "No ack after read start";
  143                 goto err_exit_stop;
  144         }
  145         
  146         for (i = 0; i < sz - 1; i++) {
  147                 if ((rd = oc_rd_cmd(OC_COMMAND_READ)) < 0) {
  148                         err = "I2C read data byte failed.";
  149                         goto err_exit_stop;
  150                 }
  151         buf[i] = rd;
  152         }
  153 
  154         /* last byte */
  155         if ((rd = oc_rd_cmd(OC_COMMAND_RDNACK)) < 0) {
  156                 err = "I2C read last data byte failed.";
  157                 goto err_exit_stop;
  158         }
  159         buf[sz - 1] = rd;
  160 
  161 err_exit_stop:
  162         oc_write_reg(OC_I2C_CMD_REG, OC_COMMAND_STOP);
  163         if (oc_wait_on_status(OC_STATUS_BUSY) < 0)
  164                 printf("%s: stop failed", __func__);
  165 
  166 err_exit:
  167         if (err) {
  168                 printf("%s: Failed (%s)\n", __func__, err);
  169                 return (-1);
  170         }
  171         return (0);
  172 }

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