diff options
Diffstat (limited to 'arch/arm/mach-zynqmp/ecc_spl_init.c')
| -rw-r--r-- | arch/arm/mach-zynqmp/ecc_spl_init.c | 163 |
1 files changed, 163 insertions, 0 deletions
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 00000000000..f547d8e3a5b --- /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); +} |