ca950537bb
On XLP evaluation platform, the board information is stored in an I2C eeprom and the network block configuration is available from a CPLD connected to the GBU (NOR flash bus). Add support for both of these.
173 lines
4.3 KiB
C
173 lines
4.3 KiB
C
/*-
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* Copyright (c) 2003-2012 Broadcom Corporation
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* All Rights Reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/endian.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/bus.h>
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#include <dev/iicbus/iicoc.h>
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#include <mips/nlm/hal/haldefs.h>
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#include <mips/nlm/hal/iomap.h>
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#include <mips/nlm/hal/mips-extns.h> /* needed by board.h */
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#include <mips/nlm/board.h>
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/*
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* We have to read the EEPROM in early boot (now only for MAC addr)
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* but later for board information. Use simple polled mode driver
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* for I2C
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*/
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#define oc_read_reg(reg) nlm_read_reg(eeprom_i2c_base, reg)
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#define oc_write_reg(reg, val) nlm_write_reg(eeprom_i2c_base, reg, val)
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static uint64_t eeprom_i2c_base;
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static int
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oc_wait_on_status(uint8_t bit)
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{
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int tries = I2C_TIMEOUT;
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uint8_t status;
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do {
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status = oc_read_reg(OC_I2C_STATUS_REG);
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} while ((status & bit) != 0 && --tries > 0);
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return (tries == 0 ? -1: 0);
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}
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static int
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oc_rd_cmd(uint8_t cmd)
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{
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uint8_t data;
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oc_write_reg(OC_I2C_CMD_REG, cmd);
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if (oc_wait_on_status(OC_STATUS_TIP) < 0)
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return (-1);
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data = oc_read_reg(OC_I2C_DATA_REG);
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return (data);
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}
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static int
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oc_wr_cmd(uint8_t data, uint8_t cmd)
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{
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oc_write_reg(OC_I2C_DATA_REG, data);
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oc_write_reg(OC_I2C_CMD_REG, cmd);
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if (oc_wait_on_status(OC_STATUS_TIP) < 0)
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return (-1);
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return (0);
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}
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int
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nlm_board_eeprom_read(int node, int bus, int addr, int offs, uint8_t *buf,
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int sz)
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{
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int rd, i;
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char *err = NULL;
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eeprom_i2c_base = nlm_pcicfg_base(XLP_IO_I2C_OFFSET(node, bus)) +
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XLP_IO_PCI_HDRSZ;
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if (oc_wait_on_status(OC_STATUS_BUSY) < 0) {
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err = "Not idle";
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goto err_exit;
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}
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/* write start */
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if (oc_wr_cmd(addr, OC_COMMAND_START)) {
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err = "I2C write start failed.";
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goto err_exit;
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}
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if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_NACK) {
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err = "No ack after start";
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goto err_exit_stop;
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}
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if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_AL) {
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err = "I2C Bus Arbitration Lost";
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goto err_exit_stop;
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}
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/* Write offset */
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if (oc_wr_cmd(offs, OC_COMMAND_WRITE)) {
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err = "I2C write slave offset failed.";
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goto err_exit_stop;
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}
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if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_NACK) {
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err = "No ack after write";
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goto err_exit_stop;
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}
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/* read start */
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if (oc_wr_cmd(addr | 1, OC_COMMAND_START)) {
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err = "I2C read start failed.";
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goto err_exit_stop;
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}
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if (oc_read_reg(OC_I2C_STATUS_REG) & OC_STATUS_NACK) {
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err = "No ack after read start";
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goto err_exit_stop;
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}
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for (i = 0; i < sz - 1; i++) {
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if ((rd = oc_rd_cmd(OC_COMMAND_READ)) < 0) {
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err = "I2C read data byte failed.";
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goto err_exit_stop;
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}
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buf[i] = rd;
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}
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/* last byte */
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if ((rd = oc_rd_cmd(OC_COMMAND_RDNACK)) < 0) {
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err = "I2C read last data byte failed.";
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goto err_exit_stop;
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}
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buf[sz - 1] = rd;
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err_exit_stop:
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oc_write_reg(OC_I2C_CMD_REG, OC_COMMAND_STOP);
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if (oc_wait_on_status(OC_STATUS_BUSY) < 0)
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printf("%s: stop failed", __func__);
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err_exit:
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if (err) {
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printf("%s: Failed (%s)\n", __func__, err);
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return (-1);
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}
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return (0);
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}
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