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/*
* Copyright (C) 2012 - 2013 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2012 - 2013 Xilinx, Inc. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/hardware.h>
DECLARE_GLOBAL_DATA_PTR;
/* Control regsiter bitfield definitions */
#define ZYNQ_DDRC_CTRLREG_BUSWIDTH_MASK 0xC
#define ZYNQ_DDRC_CTRLREG_BUSWIDTH_SHIFT 2
#define ZYNQ_DDRC_CTRLREG_BUSWIDTH_16BIT 1
/* ECC scrub regsiter definitions */
#define ZYNQ_DDRC_ECC_SCRUBREG_ECC_MODE_MASK 0x7
#define ZYNQ_DDRC_ECC_SCRUBREG_ECCMODE_SECDED 0x4
void zynq_ddrc_init(void)
{
u32 width, ecctype;
width = readl(&ddrc_base->ddrc_ctrl);
width = (width & ZYNQ_DDRC_CTRLREG_BUSWIDTH_MASK) >>
ZYNQ_DDRC_CTRLREG_BUSWIDTH_SHIFT;
ecctype = (readl(&ddrc_base->ecc_scrub) &
ZYNQ_DDRC_ECC_SCRUBREG_ECC_MODE_MASK);
/* ECC is enabled when memory is in 16bit mode and it is enabled */
if ((ecctype == ZYNQ_DDRC_ECC_SCRUBREG_ECCMODE_SECDED) &&
(width == ZYNQ_DDRC_CTRLREG_BUSWIDTH_16BIT)) {
puts("Memory: ECC enabled\n");
/*
* Clear the first 1MB because it is not initialized from
* first stage bootloader. To get ECC to work all memory has
* been initialized by writing any value.
*/
memset((void *)0, 0, 1 * 1024 * 1024);
} else {
puts("Memory: ECC disabled\n");
}
}
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