xref: /openbmc/u-boot/board/freescale/c29xpcie/cpld.c (revision 83d290c56fab2d38cd1ab4c4cc7099559c1d5046)

// SPDX-License-Identifier: GPL-2.0+
/**
 * Copyright 2013 Freescale Semiconductor
 * Author: Mingkai Hu <Mingkai.hu@freescale.com>
 *         Po Liu <Po.Liu@freescale.com>
 *
 * 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"
/**
 * Set the boot bank to the alternate bank
 */
void cpld_set_altbank(u8 banksel)
{
	struct cpld_data *cpld_data = (void *)(CONFIG_SYS_CPLD_BASE);
	u8 reg11;

	reg11 = in_8(&cpld_data->flhcsr);

	switch (banksel) {
	case 1:
		out_8(&cpld_data->flhcsr, (reg11 & CPLD_BANKSEL_MASK)
			| CPLD_BANKSEL_EN | CPLD_SELECT_BANK1);
		break;
	case 2:
		out_8(&cpld_data->flhcsr, (reg11 & CPLD_BANKSEL_MASK)
			| CPLD_BANKSEL_EN | CPLD_SELECT_BANK2);
		break;
	case 3:
		out_8(&cpld_data->flhcsr, (reg11 & CPLD_BANKSEL_MASK)
			| CPLD_BANKSEL_EN | CPLD_SELECT_BANK3);
		break;
	case 4:
		out_8(&cpld_data->flhcsr, (reg11 & CPLD_BANKSEL_MASK)
			| CPLD_BANKSEL_EN | CPLD_SELECT_BANK4);
		break;
	default:
		printf("Invalid value! [1-4]\n");
		return;
	}

	udelay(100);
	do_reset(NULL, 0, 0, NULL);
}

/**
 * Set the boot bank to the default bank
 */
void cpld_set_defbank(void)
{
	cpld_set_altbank(4);
}

#ifdef DEBUG
static void cpld_dump_regs(void)
{
	struct cpld_data *cpld_data = (void *)(CONFIG_SYS_CPLD_BASE);

	printf("chipid1		= 0x%02x\n", in_8(&cpld_data->chipid1));
	printf("chipid2		= 0x%02x\n", in_8(&cpld_data->chipid2));
	printf("hwver		= 0x%02x\n", in_8(&cpld_data->hwver));
	printf("cpldver		= 0x%02x\n", in_8(&cpld_data->cpldver));
	printf("rstcon		= 0x%02x\n", in_8(&cpld_data->rstcon));
	printf("flhcsr		= 0x%02x\n", in_8(&cpld_data->flhcsr));
	printf("wdcsr		= 0x%02x\n", in_8(&cpld_data->wdcsr));
	printf("wdkick		= 0x%02x\n", in_8(&cpld_data->wdkick));
	printf("fancsr		= 0x%02x\n", in_8(&cpld_data->fancsr));
	printf("ledcsr		= 0x%02x\n", in_8(&cpld_data->ledcsr));
	printf("misc		= 0x%02x\n", in_8(&cpld_data->misccsr));
	printf("bootor		= 0x%02x\n", in_8(&cpld_data->bootor));
	printf("bootcfg1	= 0x%02x\n", in_8(&cpld_data->bootcfg1));
	printf("bootcfg2	= 0x%02x\n", in_8(&cpld_data->bootcfg2));
	printf("bootcfg3	= 0x%02x\n", in_8(&cpld_data->bootcfg3));
	printf("bootcfg4	= 0x%02x\n", in_8(&cpld_data->bootcfg4));
	putc('\n');
}
#endif

#ifndef CONFIG_SPL_BUILD
int cpld_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	int rc = 0;
	unsigned char value;

	if (argc <= 1)
		return cmd_usage(cmdtp);

	if (strcmp(argv[1], "reset") == 0) {
		if (!strcmp(argv[2], "altbank") && argv[3]) {
			value = (u8)simple_strtoul(argv[3], NULL, 16);
			cpld_set_altbank(value);
		} else if (!argv[2])
			cpld_set_defbank();
		else
			cmd_usage(cmdtp);
#ifdef DEBUG
	} else if (strcmp(argv[1], "dump") == 0) {
		cpld_dump_regs();
#endif
	} else
		rc = cmd_usage(cmdtp);

	return rc;
}

U_BOOT_CMD(
	cpld_cmd, CONFIG_SYS_MAXARGS, 1, cpld_cmd,
	"Reset the board using the CPLD sequencer",
	"reset - hard reset to default bank 4\n"
	"cpld_cmd reset altbank [bank]- reset to alternate bank\n"
	"	- [bank] bank value select 1-4\n"
	"	- bank 1 on the flash 0x0000000~0x0ffffff\n"
	"	- bank 2 on the flash 0x1000000~0x1ffffff\n"
	"	- bank 3 on the flash 0x2000000~0x2ffffff\n"
	"	- bank 4 on the flash 0x3000000~0x3ffffff\n"
#ifdef DEBUG
	"cpld_cmd dump - display the CPLD registers\n"
#endif
	);
#endif