2 * Copyright (C) 2012 - 2013 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2012 - 2017 Xilinx, Inc. All rights reserved.
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/arch/sys_proto.h>
11 #include <asm/arch/hardware.h>
13 #ifndef CONFIG_ZYNQ_DDRC_INIT
14 void zynq_ddrc_init(void) {}
16 /* Control regsiter bitfield definitions */
17 #define ZYNQ_DDRC_CTRLREG_BUSWIDTH_MASK 0xC
18 #define ZYNQ_DDRC_CTRLREG_BUSWIDTH_SHIFT 2
19 #define ZYNQ_DDRC_CTRLREG_BUSWIDTH_16BIT 1
21 /* ECC scrub regsiter definitions */
22 #define ZYNQ_DDRC_ECC_SCRUBREG_ECC_MODE_MASK 0x7
23 #define ZYNQ_DDRC_ECC_SCRUBREG_ECCMODE_SECDED 0x4
25 void zynq_ddrc_init(void)
29 width = readl(&ddrc_base->ddrc_ctrl);
30 width = (width & ZYNQ_DDRC_CTRLREG_BUSWIDTH_MASK) >>
31 ZYNQ_DDRC_CTRLREG_BUSWIDTH_SHIFT;
32 ecctype = (readl(&ddrc_base->ecc_scrub) &
33 ZYNQ_DDRC_ECC_SCRUBREG_ECC_MODE_MASK);
35 /* ECC is enabled when memory is in 16bit mode and it is enabled */
36 if ((ecctype == ZYNQ_DDRC_ECC_SCRUBREG_ECCMODE_SECDED) &&
37 (width == ZYNQ_DDRC_CTRLREG_BUSWIDTH_16BIT)) {
40 * Clear the first 1MB because it is not initialized from
41 * first stage bootloader. To get ECC to work all memory has
42 * been initialized by writing any value.
44 /* cppcheck-suppress nullPointer */
45 memset((void *)0, 0, 1 * 1024 * 1024);
47 puts("ECC disabled ");