board_eeprom.c revision 303975
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/11.0/sys/mips/nlm/board_eeprom.c 279387 2015-02-28 00:17:29Z 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 54static uint64_t eeprom_i2c_base; 55 56static int 57oc_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 69static int 70oc_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 82static int 83oc_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 93int 94nlm_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 161err_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 166err_exit: 167 if (err) { 168 printf("%s: Failed (%s)\n", __func__, err); 169 return (-1); 170 } 171 return (0); 172} 173