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/**
* Copyright 2014 Freescale Semiconductor
*
* Author: Chunhe Lan <Chunhe.Lan@freescale.com>
*
* SPDX-License-Identifier: GPL-2.0+
*
* This file provides support for the board-specific CPLD used on some Freescale
* reference boards.
*
* The following macros need to be defined:
*
* CONFIG_SYS_CPLD_BASE - The virtual address of the base of the
* CPLD register map
*
*/
#include <common.h>
#include <command.h>
#include <asm/io.h>
#include "cpld.h"
u8 cpld_read(unsigned int reg)
{
void *p = (void *)CONFIG_SYS_CPLD_BASE;
return in_8(p + reg);
}
void cpld_write(unsigned int reg, u8 value)
{
void *p = (void *)CONFIG_SYS_CPLD_BASE;
out_8(p + reg, value);
}
/**
* Set the boot bank to the alternate bank
*/
void cpld_set_altbank(void)
{
u8 val, curbank, altbank, override;
val = CPLD_READ(vbank);
curbank = val & CPLD_BANK_SEL_MASK;
switch (curbank) {
case CPLD_SELECT_BANK0:
altbank = CPLD_SELECT_BANK4;
CPLD_WRITE(vbank, altbank);
override = CPLD_READ(software_on);
CPLD_WRITE(software_on, override | CPLD_BANK_SEL_EN);
CPLD_WRITE(sys_reset, CPLD_SYSTEM_RESET);
break;
case CPLD_SELECT_BANK4:
altbank = CPLD_SELECT_BANK0;
CPLD_WRITE(vbank, altbank);
override = CPLD_READ(software_on);
CPLD_WRITE(software_on, override | CPLD_BANK_SEL_EN);
CPLD_WRITE(sys_reset, CPLD_SYSTEM_RESET);
break;
default:
printf("CPLD Altbank Fail: Invalid value!\n");
return;
}
}
/**
* Set the boot bank to the default bank
*/
void cpld_set_defbank(void)
{
u8 val;
val = CPLD_DEFAULT_BANK;
CPLD_WRITE(global_reset, val);
}
#ifdef DEBUG
static void cpld_dump_regs(void)
{
printf("chip_id1 = 0x%02x\n", CPLD_READ(chip_id1));
printf("chip_id2 = 0x%02x\n", CPLD_READ(chip_id2));
printf("sw_maj_ver = 0x%02x\n", CPLD_READ(sw_maj_ver));
printf("sw_min_ver = 0x%02x\n", CPLD_READ(sw_min_ver));
printf("hw_ver = 0x%02x\n", CPLD_READ(hw_ver));
printf("software_on = 0x%02x\n", CPLD_READ(software_on));
printf("cfg_rcw_src = 0x%02x\n", CPLD_READ(cfg_rcw_src));
printf("res0 = 0x%02x\n", CPLD_READ(res0));
printf("vbank = 0x%02x\n", CPLD_READ(vbank));
printf("sw1_sysclk = 0x%02x\n", CPLD_READ(sw1_sysclk));
printf("sw2_status = 0x%02x\n", CPLD_READ(sw2_status));
printf("sw3_status = 0x%02x\n", CPLD_READ(sw3_status));
printf("sw4_status = 0x%02x\n", CPLD_READ(sw4_status));
printf("sys_reset = 0x%02x\n", CPLD_READ(sys_reset));
printf("global_reset = 0x%02x\n", CPLD_READ(global_reset));
printf("res1 = 0x%02x\n", CPLD_READ(res1));
putc('\n');
}
#endif
#ifndef CONFIG_SPL_BUILD
int do_cpld(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int rc = 0;
if (argc <= 1)
return cmd_usage(cmdtp);
if (strcmp(argv[1], "reset") == 0) {
if (strcmp(argv[2], "altbank") == 0)
cpld_set_altbank();
else
cpld_set_defbank();
#ifdef DEBUG
} else if (strcmp(argv[1], "dump") == 0) {
cpld_dump_regs();
#endif
} else
rc = cmd_usage(cmdtp);
return rc;
}
U_BOOT_CMD(
cpld, CONFIG_SYS_MAXARGS, 1, do_cpld,
"Reset the board or alternate bank",
"reset - reset to default bank\n"
"cpld reset altbank - reset to alternate bank\n"
#ifdef DEBUG
"cpld dump - display the CPLD registers\n"
#endif
);
#endif
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