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// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (C) 2012 Altera Corporation <www.altera.com>
* All rights reserved.
*
* This file contains only support functions used also by the SoCFPGA
* platform code, the real meat is located in drivers/fpga/socfpga.c .
*/
#include <config.h>
#include <asm/io.h>
#include <linux/errno.h>
#include <asm/arch/fpga_manager.h>
#include <asm/arch/reset_manager.h>
#include <asm/arch/system_manager.h>
/* Timeout count */
#define FPGA_TIMEOUT_CNT 0x1000000
static struct socfpga_fpga_manager *fpgamgr_regs =
(struct socfpga_fpga_manager *)SOCFPGA_FPGAMGRREGS_ADDRESS;
/* Check whether FPGA Init_Done signal is high */
static int is_fpgamgr_initdone_high(void)
{
unsigned long val;
val = readl(&fpgamgr_regs->gpio_ext_porta);
return val & FPGAMGRREGS_MON_GPIO_EXT_PORTA_ID_MASK;
}
/* Get the FPGA mode */
int fpgamgr_get_mode(void)
{
unsigned long val;
val = readl(&fpgamgr_regs->stat);
return val & FPGAMGRREGS_STAT_MODE_MASK;
}
/* Check whether FPGA is ready to be accessed */
int fpgamgr_test_fpga_ready(void)
{
/* Check for init done signal */
if (!is_fpgamgr_initdone_high())
return 0;
/* Check again to avoid false glitches */
if (!is_fpgamgr_initdone_high())
return 0;
if (fpgamgr_get_mode() != FPGAMGRREGS_MODE_USERMODE)
return 0;
return 1;
}
/* Poll until FPGA is ready to be accessed or timeout occurred */
int fpgamgr_poll_fpga_ready(void)
{
unsigned long i;
/* If FPGA is blank, wait till WD invoke warm reset */
for (i = 0; i < FPGA_TIMEOUT_CNT; i++) {
/* check for init done signal */
if (!is_fpgamgr_initdone_high())
continue;
/* check again to avoid false glitches */
if (!is_fpgamgr_initdone_high())
continue;
return 1;
}
return 0;
}
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