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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2003-2012 Broadcom Corporation
    5  * All Rights Reserved
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in
   15  *    the documentation and/or other materials provided with the
   16  *    distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
   25  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   26  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
   27  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
   28  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: stable/12/sys/mips/nlm/board_eeprom.c 326259 2017-11-27 15:07:26Z pfg $");
   33 #include <sys/param.h>
   34 #include <sys/endian.h>
   35 #include <sys/systm.h>
   36 #include <sys/kernel.h>
   37 #include <sys/limits.h>
   38 #include <sys/bus.h>
   39 
   40 #include <dev/iicbus/iicoc.h>
   41 
   42 #include <mips/nlm/hal/haldefs.h>
   43 #include <mips/nlm/hal/iomap.h>
   44 #include <mips/nlm/hal/mips-extns.h> /* needed by board.h */
   45 
   46 #include <mips/nlm/board.h>
   47 
   48 /*
   49  * We have to read the EEPROM in early boot (now only for MAC addr)
   50  * but later for board information.  Use simple polled mode driver
   51  * for I2C
   52  */
   53 #define oc_read_reg(reg)        nlm_read_reg(eeprom_i2c_base, reg)
   54 #define oc_write_reg(reg, val)  nlm_write_reg(eeprom_i2c_base, reg, val)
   55 
   56 static uint64_t eeprom_i2c_base;
   57 
   58 static int
   59 oc_wait_on_status(uint8_t bit)
   60 {
   61         int tries = I2C_TIMEOUT;
   62         uint8_t status;
   63 
   64         do {
   65                 status = oc_read_reg(OC_I2C_STATUS_REG);
   66         } while ((status & bit) != 0 && --tries > 0);
   67 
   68         return (tries == 0 ? -1: 0);
   69 }
   70 
   71 static int
   72 oc_rd_cmd(uint8_t cmd)
   73 {
   74         uint8_t data;
   75 
   76                 oc_write_reg(OC_I2C_CMD_REG, cmd);
   77                 if (oc_wait_on_status(OC_STATUS_TIP) < 0)
   78                         return (-1);
   79 
   80         data = oc_read_reg(OC_I2C_DATA_REG);
   81         return (data);
   82 }
   83 
   84 static int
   85 oc_wr_cmd(uint8_t data, uint8_t cmd)
   86 {
   87         oc_write_reg(OC_I2C_DATA_REG, data);
   88         oc_write_reg(OC_I2C_CMD_REG, cmd);
   89 
   90         if (oc_wait_on_status(OC_STATUS_TIP) < 0)
   91                 return (-1);
   92         return (0);
   93 }
   94 
   95 int
   96 nlm_board_eeprom_read(int node, int bus, int addr, int offs, uint8_t *buf,
   97     int sz)
   98 {
   99         int rd, i;
  100         char *err = NULL;
  101 
  102         eeprom_i2c_base = nlm_pcicfg_base(XLP_IO_I2C_OFFSET(node, bus)) +
  103             XLP_IO_PCI_HDRSZ;
  104 
  105         if (oc_wait_on_status(OC_STATUS_BUSY) < 0) {
  106                 err = "Not idle";
  107                 goto err_exit;
  108         }
  109 
  110         /* write start */
  111         if (oc_wr_cmd(addr, OC_COMMAND_START)) {
  112                 err = "I2C write start failed.";
  113                 goto err_exit;
  114         }
  115 
  116         if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_NACK) {
  117                 err = "No ack after start";
  118                 goto err_exit_stop;
  119         }
  120 
  121         if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_AL) {
  122                 err = "I2C Bus Arbitration Lost";
  123                 goto err_exit_stop;
  124         }
  125 
  126         /* Write offset */
  127         if (oc_wr_cmd(offs, OC_COMMAND_WRITE)) {
  128                 err = "I2C write slave offset failed.";
  129                 goto err_exit_stop;
  130         }
  131 
  132         if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_NACK) {
  133                 err = "No ack after write";
  134                 goto err_exit_stop;
  135         }
  136 
  137         /* read start */
  138         if (oc_wr_cmd(addr | 1, OC_COMMAND_START)) {
  139                 err = "I2C read start failed.";
  140                 goto err_exit_stop;
  141         }
  142 
  143         if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_NACK) {
  144                 err = "No ack after read start";
  145                 goto err_exit_stop;
  146         }
  147 
  148         for (i = 0; i < sz - 1; i++) {
  149                 if ((rd = oc_rd_cmd(OC_COMMAND_READ)) < 0) {
  150                         err = "I2C read data byte failed.";
  151                         goto err_exit_stop;
  152                 }
  153         buf[i] = rd;
  154         }
  155 
  156         /* last byte */
  157         if ((rd = oc_rd_cmd(OC_COMMAND_RDNACK)) < 0) {
  158                 err = "I2C read last data byte failed.";
  159                 goto err_exit_stop;
  160         }
  161         buf[sz - 1] = rd;
  162 
  163 err_exit_stop:
  164         oc_write_reg(OC_I2C_CMD_REG, OC_COMMAND_STOP);
  165         if (oc_wait_on_status(OC_STATUS_BUSY) < 0)
  166                 printf("%s: stop failed", __func__);
  167 
  168 err_exit:
  169         if (err) {
  170                 printf("%s: Failed (%s)\n", __func__, err);
  171                 return (-1);
  172         }
  173         return (0);
  174 }

Cache object: 9036dc53ea9ff54c4d48a2b4a0dfbab5


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.