Use the ZDMA channel 0 to initialize the DRAM banks. This avoid spurious ECC errors that can occur when accessing unitialized memory.

The feature is enabled by setting the option CONFIG_SPL_ZYNQMP_DRAM_ECC_INIT and providing the following data:

SPL_ZYNQMP_DRAM_BANK1_BASE: start of memory to initialize SPL_ZYNQMP_DRAM_BANK1_LEN : len of memory to initialize (hex) SPL_ZYNQMP_DRAM_BANK2_BASE: start of memory to initialize SPL_ZYNQMP_DRAM_BANK2_LEN : len of memory to initialize (hex)

Setting SPL_ZYNQMP_DRAM_BANK_LEN to 0 takes no action.

Signed-off-by: Jorge Ramirez-Ortiz jorge@foundries.io --- v2: extend commit message _BASE suffix for DRAM_BANK address DRAM_BANK2_BASE to 0x8.00.00.00.00 remove unnecessary includes from ecc_spl_init.c add ADMA_CH0_BASEADDR to hardware.h remove cache management timeout on loops retry once on DMA status error move DMA restore to reset values to its own function(*) removed extern clause from splc and added header file instead fixed duplicated call to board_early_init_r()

(*) IP reset: there is no register to toggle (checked docs and linux kernel) opted for leaving the restore function as per FSBL

arch/arm/mach-zynqmp/Kconfig | 35 ++++ arch/arm/mach-zynqmp/Makefile | 1 + arch/arm/mach-zynqmp/ecc_spl_init.c | 163 ++++++++++++++++++ .../mach-zynqmp/include/mach/ecc_spl_init.h | 13 ++ arch/arm/mach-zynqmp/include/mach/hardware.h | 2 + arch/arm/mach-zynqmp/spl.c | 4 + 6 files changed, 218 insertions(+) create mode 100644 arch/arm/mach-zynqmp/ecc_spl_init.c create mode 100644 arch/arm/mach-zynqmp/include/mach/ecc_spl_init.h

diff --git a/arch/arm/mach-zynqmp/Kconfig b/arch/arm/mach-zynqmp/Kconfig index f1301f6661..39144d654e 100644 --- a/arch/arm/mach-zynqmp/Kconfig +++ b/arch/arm/mach-zynqmp/Kconfig @@ -92,6 +92,41 @@ config ZYNQMP_NO_DDR This option configures MMU with no DDR to avoid speculative access to DDR memory where DDR is not present.

+config SPL_ZYNQMP_DRAM_ECC_INIT + bool "Initialize DRAM ECC" + depends on SPL + help + This option initializes all memory to 0xdeadbeef. Must be set if your + memory is of ECC type. + +config SPL_ZYNQMP_DRAM_BANK1_BASE + depends on SPL_ZYNQMP_DRAM_ECC_INIT + hex "DRAM Bank1 address" + default 0x00000000 + help + Start address of DRAM ECC bank1 + +config SPL_ZYNQMP_DRAM_BANK1_LEN + depends on SPL_ZYNQMP_DRAM_ECC_INIT + hex "DRAM Bank1 size" + default 0x80000000 + help + Size in bytes of the DRAM ECC bank1 + +config SPL_ZYNQMP_DRAM_BANK2_BASE + depends on SPL_ZYNQMP_DRAM_ECC_INIT + hex "DRAM Bank2 address" + default 0x800000000 + help + Start address of DRAM ECC bank2 + +config SPL_ZYNQMP_DRAM_BANK2_LEN + depends on SPL_ZYNQMP_DRAM_ECC_INIT + hex "DRAM Bank2 size" + default 0x0 + help + Size in bytes of the DRAM ECC bank2. A null size takes no action. + config SYS_MALLOC_F_LEN default 0x600

diff --git a/arch/arm/mach-zynqmp/Makefile b/arch/arm/mach-zynqmp/Makefile index 8a3b074724..eb6c5112b3 100644 --- a/arch/arm/mach-zynqmp/Makefile +++ b/arch/arm/mach-zynqmp/Makefile @@ -7,4 +7,5 @@ obj-y += clk.o obj-y += cpu.o obj-$(CONFIG_MP) += mp.o obj-$(CONFIG_SPL_BUILD) += spl.o handoff.o +obj-$(CONFIG_SPL_ZYNQMP_DRAM_ECC_INIT) += ecc_spl_init.o obj-$(CONFIG_ZYNQMP_PSU_INIT_ENABLED) += psu_spl_init.o diff --git a/arch/arm/mach-zynqmp/ecc_spl_init.c b/arch/arm/mach-zynqmp/ecc_spl_init.c new file mode 100644 index 0000000000..f547d8e3a5 --- /dev/null +++ b/arch/arm/mach-zynqmp/ecc_spl_init.c @@ -0,0 +1,163 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright(c) 2015 - 2020 Xilinx, Inc. + * + * Jorge Ramirez-Ortiz jorge@foundries.io + */ + +#include <common.h> +#include <cpu_func.h> +#include <asm/arch/hardware.h> +#include <asm/arch/ecc_spl_init.h> +#include <asm/io.h> +#include <linux/delay.h> + +#define ZDMA_TRANSFER_MAX_LEN (0x3FFFFFFFU - 7U) +#define ZDMA_CH_STATUS ((ADMA_CH0_BASEADDR) + 0x0000011CU) +#define ZDMA_CH_STATUS_STATE_MASK 0x00000003U +#define ZDMA_CH_STATUS_STATE_DONE 0x00000000U +#define ZDMA_CH_STATUS_STATE_ERR 0x00000003U +#define ZDMA_CH_CTRL0 ((ADMA_CH0_BASEADDR) + 0x00000110U) +#define ZDMA_CH_CTRL0_POINT_TYPE_MASK (u32)0x00000040U +#define ZDMA_CH_CTRL0_POINT_TYPE_NORMAL (u32)0x00000000U +#define ZDMA_CH_CTRL0_MODE_MASK (u32)0x00000030U +#define ZDMA_CH_CTRL0_MODE_WR_ONLY (u32)0x00000010U +#define ZDMA_CH_CTRL0_TOTAL_BYTE_COUNT ((ADMA_CH0_BASEADDR) + 0x00000188U) +#define ZDMA_CH_WR_ONLY_WORD0 ((ADMA_CH0_BASEADDR) + 0x00000148U) +#define ZDMA_CH_WR_ONLY_WORD1 ((ADMA_CH0_BASEADDR) + 0x0000014CU) +#define ZDMA_CH_WR_ONLY_WORD2 ((ADMA_CH0_BASEADDR) + 0x00000150U) +#define ZDMA_CH_WR_ONLY_WORD3 ((ADMA_CH0_BASEADDR) + 0x00000154U) +#define ZDMA_CH_DST_DSCR_WORD0 ((ADMA_CH0_BASEADDR) + 0x00000138U) +#define ZDMA_CH_DST_DSCR_WORD0_LSB_MASK 0xFFFFFFFFU +#define ZDMA_CH_DST_DSCR_WORD1 ((ADMA_CH0_BASEADDR) + 0x0000013CU) +#define ZDMA_CH_DST_DSCR_WORD1_MSB_MASK 0x0001FFFFU +#define ZDMA_CH_SRC_DSCR_WORD2 ((ADMA_CH0_BASEADDR) + 0x00000130U) +#define ZDMA_CH_DST_DSCR_WORD2 ((ADMA_CH0_BASEADDR) + 0x00000140U) +#define ZDMA_CH_CTRL2 ((ADMA_CH0_BASEADDR) + 0x00000200U) +#define ZDMA_CH_CTRL2_EN_MASK 0x00000001U +#define ZDMA_CH_ISR ((ADMA_CH0_BASEADDR) + 0x00000100U) +#define ZDMA_CH_ISR_DMA_DONE_MASK 0x00000400U +#define ECC_INIT_VAL_WORD 0xDEADBEEFU + +#define ZDMA_IDLE_TIMEOUT_USEC 1000000 +#define ZDMA_DONE_TIMEOUT_USEC 5000000 + +static void ecc_zdma_restore(void) +{ + /* Restore reset values for the DMA registers used */ + writel(ZDMA_CH_CTRL0, 0x00000080U); + writel(ZDMA_CH_WR_ONLY_WORD0, 0x00000000U); + writel(ZDMA_CH_WR_ONLY_WORD1, 0x00000000U); + writel(ZDMA_CH_WR_ONLY_WORD2, 0x00000000U); + writel(ZDMA_CH_WR_ONLY_WORD3, 0x00000000U); + writel(ZDMA_CH_DST_DSCR_WORD0, 0x00000000U); + writel(ZDMA_CH_DST_DSCR_WORD1, 0x00000000U); + writel(ZDMA_CH_SRC_DSCR_WORD2, 0x00000000U); + writel(ZDMA_CH_DST_DSCR_WORD2, 0x00000000U); + writel(ZDMA_CH_CTRL0_TOTAL_BYTE_COUNT, 0x00000000U); +} + +static void ecc_dram_bank_init(u64 addr, u64 len) +{ + bool retry = true; + u32 timeout; + u64 bytes; + u32 size; + u64 src; + u32 reg; + + if (!len) + return; +retry: + bytes = len; + src = addr; + ecc_zdma_restore(); + while (bytes > 0) { + size = bytes > ZDMA_TRANSFER_MAX_LEN ? + ZDMA_TRANSFER_MAX_LEN : (u32)bytes; + + /* Wait until the DMA is in idle state */ + timeout = ZDMA_IDLE_TIMEOUT_USEC; + do { + udelay(1); + reg = readl(ZDMA_CH_STATUS); + reg &= ZDMA_CH_STATUS_STATE_MASK; + if (!timeout--) { + puts("error, ECC DMA failed to idle\n"); + goto done; + } + + } while ((reg != ZDMA_CH_STATUS_STATE_DONE) && + (reg != ZDMA_CH_STATUS_STATE_ERR)); + + /* Enable Simple (Write Only) Mode */ + reg = readl(ZDMA_CH_CTRL0); + reg &= (ZDMA_CH_CTRL0_POINT_TYPE_MASK | + ZDMA_CH_CTRL0_MODE_MASK); + reg |= (ZDMA_CH_CTRL0_POINT_TYPE_NORMAL | + ZDMA_CH_CTRL0_MODE_WR_ONLY); + writel(reg, ZDMA_CH_CTRL0); + + /* Fill in the data to be written */ + writel(ECC_INIT_VAL_WORD, ZDMA_CH_WR_ONLY_WORD0); + writel(ECC_INIT_VAL_WORD, ZDMA_CH_WR_ONLY_WORD1); + writel(ECC_INIT_VAL_WORD, ZDMA_CH_WR_ONLY_WORD2); + writel(ECC_INIT_VAL_WORD, ZDMA_CH_WR_ONLY_WORD3); + + /* Write Destination Address */ + writel((u32)(src & ZDMA_CH_DST_DSCR_WORD0_LSB_MASK), + ZDMA_CH_DST_DSCR_WORD0); + writel((u32)((src >> 32) & ZDMA_CH_DST_DSCR_WORD1_MSB_MASK), + ZDMA_CH_DST_DSCR_WORD1); + + /* Size to be Transferred. Recommended to set both src and dest sizes */ + writel(size, ZDMA_CH_SRC_DSCR_WORD2); + writel(size, ZDMA_CH_DST_DSCR_WORD2); + + /* DMA Enable */ + reg = readl(ZDMA_CH_CTRL2); + reg |= ZDMA_CH_CTRL2_EN_MASK; + writel(reg, ZDMA_CH_CTRL2); + + /* Check the status of the transfer by polling on DMA Done */ + timeout = ZDMA_DONE_TIMEOUT_USEC; + do { + udelay(1); + reg = readl(ZDMA_CH_ISR); + reg &= ZDMA_CH_ISR_DMA_DONE_MASK; + if (!timeout--) { + puts("error, ECC DMA timeout\n"); + goto done; + } + } while (reg != ZDMA_CH_ISR_DMA_DONE_MASK); + + /* Clear DMA status */ + reg = readl(ZDMA_CH_ISR); + reg |= ZDMA_CH_ISR_DMA_DONE_MASK; + writel(ZDMA_CH_ISR_DMA_DONE_MASK, ZDMA_CH_ISR); + + /* Read the channel status for errors */ + reg = readl(ZDMA_CH_STATUS); + if (reg == ZDMA_CH_STATUS_STATE_ERR) { + if (retry) { + retry = false; + goto retry; + } + puts("error, ECC DMA error\n"); + break; + } + + bytes -= size; + src += size; + } +done: + ecc_zdma_restore(); +} + +void zynqmp_ecc_init(void) +{ + ecc_dram_bank_init(CONFIG_SPL_ZYNQMP_DRAM_BANK1_BASE, + CONFIG_SPL_ZYNQMP_DRAM_BANK1_LEN); + ecc_dram_bank_init(CONFIG_SPL_ZYNQMP_DRAM_BANK2_BASE, + CONFIG_SPL_ZYNQMP_DRAM_BANK2_LEN); +} diff --git a/arch/arm/mach-zynqmp/include/mach/ecc_spl_init.h b/arch/arm/mach-zynqmp/include/mach/ecc_spl_init.h new file mode 100644 index 0000000000..b4b6fcf53b --- /dev/null +++ b/arch/arm/mach-zynqmp/include/mach/ecc_spl_init.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Copyright(c) 2015 - 2020 Xilinx, Inc. + * + * Jorge Ramirez-Ortiz jorge@foundries.io + */ + +#ifndef __ARCH_ZYNQMP_ECC_INIT_H +#define __ARCH_ZYNQMP_ECC_INIT_H + +void zynqmp_ecc_init(void); + +#endif diff --git a/arch/arm/mach-zynqmp/include/mach/hardware.h b/arch/arm/mach-zynqmp/include/mach/hardware.h index 3d3c48e247..fa612887a4 100644 --- a/arch/arm/mach-zynqmp/include/mach/hardware.h +++ b/arch/arm/mach-zynqmp/include/mach/hardware.h @@ -19,6 +19,8 @@ #define ZYNQMP_CRL_APB_BOOT_PIN_CTRL_OUT_EN_SHIFT 0 #define ZYNQMP_CRL_APB_BOOT_PIN_CTRL_OUT_VAL_SHIFT 8

+#define ADMA_CH0_BASEADDR 0xFFA80000 + #define PS_MODE0 BIT(0) #define PS_MODE1 BIT(1) #define PS_MODE2 BIT(2) diff --git a/arch/arm/mach-zynqmp/spl.c b/arch/arm/mach-zynqmp/spl.c index 88386b23e5..8fcae2c6a6 100644 --- a/arch/arm/mach-zynqmp/spl.c +++ b/arch/arm/mach-zynqmp/spl.c @@ -15,6 +15,7 @@ #include <asm/io.h> #include <asm/spl.h> #include <asm/arch/hardware.h> +#include <asm/arch/ecc_spl_init.h> #include <asm/arch/psu_init_gpl.h> #include <asm/arch/sys_proto.h>

@@ -22,6 +23,9 @@ void board_init_f(ulong dummy) { board_early_init_f(); board_early_init_r(); +#ifdef CONFIG_SPL_ZYNQMP_DRAM_ECC_INIT + zynqmp_ecc_init(); +#endif }

static void ps_mode_reset(ulong mode)