u-boot/board/freescale/common/qixis.c
Prabhakar Kushwaha 960aa89bda board/common: Add support for QIXIS read/write using i2c
QIXIS FPGA is accessable via both i2c and flash controller.
Only flash controller access is supported.

Add support of i2c based access. It is quite useful in the scenario
where either flash controller path is broken or not present.

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
2013-01-30 11:25:15 -06:00

235 lines
5.5 KiB
C

/*
* Copyright 2011 Freescale Semiconductor
* Author: Shengzhou Liu <Shengzhou.Liu@freescale.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This file provides support for the QIXIS of some Freescale reference boards.
*
*/
#include <common.h>
#include <command.h>
#include <asm/io.h>
#include <linux/time.h>
#include <i2c.h>
#include "qixis.h"
#ifdef CONFIG_SYS_I2C_FPGA_ADDR
u8 qixis_read_i2c(unsigned int reg)
{
return i2c_reg_read(CONFIG_SYS_I2C_FPGA_ADDR, reg);
}
void qixis_write_i2c(unsigned int reg, u8 value)
{
u8 val = value;
i2c_reg_write(CONFIG_SYS_I2C_FPGA_ADDR, reg, val);
}
#endif
u8 qixis_read(unsigned int reg)
{
void *p = (void *)QIXIS_BASE;
return in_8(p + reg);
}
void qixis_write(unsigned int reg, u8 value)
{
void *p = (void *)QIXIS_BASE;
out_8(p + reg, value);
}
u16 qixis_read_minor(void)
{
u16 minor;
/* this data is in little endian */
QIXIS_WRITE(tagdata, 5);
minor = QIXIS_READ(tagdata);
QIXIS_WRITE(tagdata, 6);
minor += QIXIS_READ(tagdata) << 8;
return minor;
}
char *qixis_read_time(char *result)
{
time_t time = 0;
int i;
/* timestamp is in 32-bit big endian */
for (i = 8; i <= 11; i++) {
QIXIS_WRITE(tagdata, i);
time = (time << 8) + QIXIS_READ(tagdata);
}
return ctime_r(&time, result);
}
char *qixis_read_tag(char *buf)
{
int i;
char tag, *ptr = buf;
for (i = 16; i <= 63; i++) {
QIXIS_WRITE(tagdata, i);
tag = QIXIS_READ(tagdata);
*(ptr++) = tag;
if (!tag)
break;
}
if (i > 63)
*ptr = '\0';
return buf;
}
/*
* return the string of binary of u8 in the format of
* 1010 10_0. The masked bit is filled as underscore.
*/
const char *byte_to_binary_mask(u8 val, u8 mask, char *buf)
{
char *ptr;
int i;
ptr = buf;
for (i = 0x80; i > 0x08 ; i >>= 1, ptr++)
*ptr = (val & i) ? '1' : ((mask & i) ? '_' : '0');
*(ptr++) = ' ';
for (i = 0x08; i > 0 ; i >>= 1, ptr++)
*ptr = (val & i) ? '1' : ((mask & i) ? '_' : '0');
*ptr = '\0';
return buf;
}
void qixis_reset(void)
{
QIXIS_WRITE(rst_ctl, QIXIS_RST_CTL_RESET);
}
void qixis_bank_reset(void)
{
QIXIS_WRITE(rcfg_ctl, QIXIS_RCFG_CTL_RECONFIG_IDLE);
QIXIS_WRITE(rcfg_ctl, QIXIS_RCFG_CTL_RECONFIG_START);
}
/* Set the boot bank to the power-on default bank */
void clear_altbank(void)
{
u8 reg;
reg = QIXIS_READ(brdcfg[0]);
reg = (reg & ~QIXIS_LBMAP_MASK) | QIXIS_LBMAP_DFLTBANK;
QIXIS_WRITE(brdcfg[0], reg);
}
/* Set the boot bank to the alternate bank */
void set_altbank(void)
{
u8 reg;
reg = QIXIS_READ(brdcfg[0]);
reg = (reg & ~QIXIS_LBMAP_MASK) | QIXIS_LBMAP_ALTBANK;
QIXIS_WRITE(brdcfg[0], reg);
}
static void qixis_dump_regs(void)
{
int i;
printf("id = %02x\n", QIXIS_READ(id));
printf("arch = %02x\n", QIXIS_READ(arch));
printf("scver = %02x\n", QIXIS_READ(scver));
printf("model = %02x\n", QIXIS_READ(model));
printf("rst_ctl = %02x\n", QIXIS_READ(rst_ctl));
printf("aux = %02x\n", QIXIS_READ(aux));
for (i = 0; i < 16; i++)
printf("brdcfg%02d = %02x\n", i, QIXIS_READ(brdcfg[i]));
for (i = 0; i < 16; i++)
printf("dutcfg%02d = %02x\n", i, QIXIS_READ(dutcfg[i]));
printf("sclk = %02x%02x%02x\n", QIXIS_READ(sclk[0]),
QIXIS_READ(sclk[1]), QIXIS_READ(sclk[2]));
printf("dclk = %02x%02x%02x\n", QIXIS_READ(dclk[0]),
QIXIS_READ(dclk[1]), QIXIS_READ(dclk[2]));
printf("aux = %02x\n", QIXIS_READ(aux));
printf("watch = %02x\n", QIXIS_READ(watch));
printf("ctl_sys = %02x\n", QIXIS_READ(ctl_sys));
printf("rcw_ctl = %02x\n", QIXIS_READ(rcw_ctl));
printf("present = %02x\n", QIXIS_READ(present));
printf("present2 = %02x\n", QIXIS_READ(present2));
printf("clk_spd = %02x\n", QIXIS_READ(clk_spd));
printf("stat_dut = %02x\n", QIXIS_READ(stat_dut));
printf("stat_sys = %02x\n", QIXIS_READ(stat_sys));
printf("stat_alrm = %02x\n", QIXIS_READ(stat_alrm));
}
static void __qixis_dump_switch(void)
{
puts("Reverse engineering switch is not implemented for this board\n");
}
void qixis_dump_switch(void)
__attribute__((weak, alias("__qixis_dump_switch")));
int qixis_reset_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int i;
if (argc <= 1) {
clear_altbank();
qixis_reset();
} else if (strcmp(argv[1], "altbank") == 0) {
set_altbank();
qixis_bank_reset();
} else if (strcmp(argv[1], "watchdog") == 0) {
static char *period[9] = {"2s", "4s", "8s", "16s", "32s",
"1min", "2min", "4min", "8min"};
u8 rcfg = QIXIS_READ(rcfg_ctl);
if (argv[2] == NULL) {
printf("qixis watchdog <watchdog_period>\n");
return 0;
}
for (i = 0; i < ARRAY_SIZE(period); i++) {
if (strcmp(argv[2], period[i]) == 0) {
/* disable watchdog */
QIXIS_WRITE(rcfg_ctl,
rcfg & ~QIXIS_RCFG_CTL_WATCHDOG_ENBLE);
QIXIS_WRITE(watch, ((i<<2) - 1));
QIXIS_WRITE(rcfg_ctl, rcfg);
return 0;
}
}
} else if (strcmp(argv[1], "dump") == 0) {
qixis_dump_regs();
return 0;
} else if (strcmp(argv[1], "switch") == 0) {
qixis_dump_switch();
return 0;
} else {
printf("Invalid option: %s\n", argv[1]);
return 1;
}
return 0;
}
U_BOOT_CMD(
qixis_reset, CONFIG_SYS_MAXARGS, 1, qixis_reset_cmd,
"Reset the board using the FPGA sequencer",
"- hard reset to default bank\n"
"qixis_reset altbank - reset to alternate bank\n"
"qixis watchdog <watchdog_period> - set the watchdog period\n"
" period: 1s 2s 4s 8s 16s 32s 1min 2min 4min 8min\n"
"qixis_reset dump - display the QIXIS registers\n"
"qixis_reset switch - display switch\n"
);