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zynq: Add new ddrc driver for ECC support

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The first 1MB is not initialized by first stage bootloader.
Check if memory is setup to 16bit mode and ECC is enabled.
If it is, clear the first 1MB.
Also u-boot should report only the half size of memory.

Acked-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2013-06-17 14:37:01 +02:00
parent a78dac79ed
commit 148ba55cc6
5 changed files with 62 additions and 0 deletions
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1
arch/arm/cpu/armv7/zynq/Makefile
View file

@ -14,6 +14,7 @@ LIB = $(obj)lib$(SOC).o
COBJS-y := timer.o
COBJS-y += cpu.o
COBJS-y += ddrc.o
COBJS-y += slcr.o
COBJS := $(COBJS-y)

50
arch/arm/cpu/armv7/zynq/ddrc.c Normal file
View file

@ -0,0 +1,50 @@
/*
* 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(0, 0, 1 * 1024 * 1024);
} else {
puts("Memory: ECC disabled\n");
}
if (width == ZYNQ_DDRC_CTRLREG_BUSWIDTH_16BIT)
gd->ram_size /= 2;
}

8
arch/arm/include/asm/arch-zynq/hardware.h
View file

@ -17,6 +17,7 @@
#define ZYNQ_SDHCI_BASEADDR1 0xE0101000
#define ZYNQ_I2C_BASEADDR0 0xE0004000
#define ZYNQ_I2C_BASEADDR1 0xE0005000
#define ZYNQ_DDRC_BASEADDR 0xF8006000
/* Reflect slcr offsets */
struct slcr_regs {
@ -84,4 +85,11 @@ struct scu_regs {
#define scu_base ((struct scu_regs *)ZYNQ_SCU_BASEADDR)
struct ddrc_regs {
u32 ddrc_ctrl; /* 0x0 */
u32 reserved[60];
u32 ecc_scrub; /* 0xF4 */
};
#define ddrc_base ((struct ddrc_regs *)ZYNQ_DDRC_BASEADDR)
#endif /* _ASM_ARCH_HARDWARE_H */

1
arch/arm/include/asm/arch-zynq/sys_proto.h
View file

@ -14,6 +14,7 @@ extern void zynq_slcr_gem_clk_setup(u32 gem_id, u32 rclk, u32 clk);
extern void zynq_slcr_devcfg_disable(void);
extern void zynq_slcr_devcfg_enable(void);
extern u32 zynq_slcr_get_idcode(void);
extern void zynq_ddrc_init(void);
/* Driver extern functions */
extern int zynq_sdhci_init(u32 regbase);

2
board/xilinx/zynq/board.c
View file

@ -96,5 +96,7 @@ int dram_init(void)
{
gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
zynq_ddrc_init();
return 0;
}