mirror of
https://github.com/AsahiLinux/u-boot
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d84bd9284e
Add Kconfig option for ddr init as this might be required in cases like ddr less systems where we want to skip ddrc init and this option is useful for it. Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/*
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* Copyright (C) 2012 - 2013 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2012 - 2013 Xilinx, Inc. All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/arch/hardware.h>
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DECLARE_GLOBAL_DATA_PTR;
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#ifndef CONFIG_ZYNQ_DDRC_INIT
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void zynq_ddrc_init(void) {}
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#else
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/* Control regsiter bitfield definitions */
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#define ZYNQ_DDRC_CTRLREG_BUSWIDTH_MASK 0xC
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#define ZYNQ_DDRC_CTRLREG_BUSWIDTH_SHIFT 2
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#define ZYNQ_DDRC_CTRLREG_BUSWIDTH_16BIT 1
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/* ECC scrub regsiter definitions */
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#define ZYNQ_DDRC_ECC_SCRUBREG_ECC_MODE_MASK 0x7
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#define ZYNQ_DDRC_ECC_SCRUBREG_ECCMODE_SECDED 0x4
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void zynq_ddrc_init(void)
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{
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u32 width, ecctype;
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width = readl(&ddrc_base->ddrc_ctrl);
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width = (width & ZYNQ_DDRC_CTRLREG_BUSWIDTH_MASK) >>
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ZYNQ_DDRC_CTRLREG_BUSWIDTH_SHIFT;
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ecctype = (readl(&ddrc_base->ecc_scrub) &
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ZYNQ_DDRC_ECC_SCRUBREG_ECC_MODE_MASK);
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/* ECC is enabled when memory is in 16bit mode and it is enabled */
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if ((ecctype == ZYNQ_DDRC_ECC_SCRUBREG_ECCMODE_SECDED) &&
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(width == ZYNQ_DDRC_CTRLREG_BUSWIDTH_16BIT)) {
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puts("ECC enabled ");
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/*
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* Clear the first 1MB because it is not initialized from
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* first stage bootloader. To get ECC to work all memory has
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* been initialized by writing any value.
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*/
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/* cppcheck-suppress nullPointer */
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memset((void *)0, 0, 1 * 1024 * 1024);
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} else {
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puts("ECC disabled ");
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}
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}
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#endif
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