+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
- */
-
-#include <bouncebuf.h>
-#include <common.h>
-#include <malloc.h>
-#include <nand.h>
-#include <asm/io.h>
-#include "axs10x.h"
-
-DECLARE_GLOBAL_DATA_PTR;
-
-#define BUS_WIDTH 8 /* AXI data bus width in bytes */
-
-/* DMA buffer descriptor bits & masks */
-#define BD_STAT_OWN (1 << 31)
-#define BD_STAT_BD_FIRST (1 << 3)
-#define BD_STAT_BD_LAST (1 << 2)
-#define BD_SIZES_BUFFER1_MASK 0xfff
-
-#define BD_STAT_BD_COMPLETE (BD_STAT_BD_FIRST | BD_STAT_BD_LAST)
-
-/* Controller command flags */
-#define B_WFR (1 << 19) /* 1b - Wait for ready */
-#define B_LC (1 << 18) /* 1b - Last cycle */
-#define B_IWC (1 << 13) /* 1b - Interrupt when complete */
-
-/* NAND cycle types */
-#define B_CT_ADDRESS (0x0 << 16) /* Address operation */
-#define B_CT_COMMAND (0x1 << 16) /* Command operation */
-#define B_CT_WRITE (0x2 << 16) /* Write operation */
-#define B_CT_READ (0x3 << 16) /* Write operation */
-
-enum nand_isr_t {
- NAND_ISR_DATAREQUIRED = 0,
- NAND_ISR_TXUNDERFLOW,
- NAND_ISR_TXOVERFLOW,
- NAND_ISR_DATAAVAILABLE,
- NAND_ISR_RXUNDERFLOW,
- NAND_ISR_RXOVERFLOW,
- NAND_ISR_TXDMACOMPLETE,
- NAND_ISR_RXDMACOMPLETE,
- NAND_ISR_DESCRIPTORUNAVAILABLE,
- NAND_ISR_CMDDONE,
- NAND_ISR_CMDAVAILABLE,
- NAND_ISR_CMDERROR,
- NAND_ISR_DATATRANSFEROVER,
- NAND_ISR_NONE
-};
-
-enum nand_regs_t {
- AC_FIFO = 0, /* address and command fifo */
- IDMAC_BDADDR = 0x18, /* idmac descriptor list base address */
- INT_STATUS = 0x118, /* interrupt status register */
- INT_CLR_STATUS = 0x120, /* interrupt clear status register */
-};
-
-struct nand_bd {
- uint32_t status; /* DES0 */
- uint32_t sizes; /* DES1 */
- uint32_t buffer_ptr0; /* DES2 */
- uint32_t buffer_ptr1; /* DES3 */
-};
-
-#define NAND_REG_WRITE(r, v) \
- writel(v, (volatile void __iomem *)(CONFIG_SYS_NAND_BASE + r))
-#define NAND_REG_READ(r) \
- readl((const volatile void __iomem *)(CONFIG_SYS_NAND_BASE + r))
-
-static struct nand_bd *bd; /* DMA buffer descriptors */
-
-/**
- * axs101_nand_write_buf - write buffer to chip
- * @mtd: MTD device structure
- * @buf: data buffer
- * @len: number of bytes to write
- */
-static uint32_t nand_flag_is_set(uint32_t flag)
-{
- uint32_t reg = NAND_REG_READ(INT_STATUS);
-
- if (reg & (1 << NAND_ISR_CMDERROR))
- return 0;
-
- if (reg & (1 << flag)) {
- NAND_REG_WRITE(INT_CLR_STATUS, 1 << flag);
- return 1;
- }
-
- return 0;
-}
-
-/**
- * axs101_nand_write_buf - write buffer to chip
- * @mtd: MTD device structure
- * @buf: data buffer
- * @len: number of bytes to write
- */
-static void axs101_nand_write_buf(struct mtd_info *mtd, const u_char *buf,
- int len)
-{
- struct bounce_buffer bbstate;
-
- bounce_buffer_start(&bbstate, (void *)buf, len, GEN_BB_READ);
-
- /* Setup buffer descriptor */
- writel(BD_STAT_OWN | BD_STAT_BD_COMPLETE, &bd->status);
- writel(ALIGN(len, BUS_WIDTH) & BD_SIZES_BUFFER1_MASK, &bd->sizes);
- writel(bbstate.bounce_buffer, &bd->buffer_ptr0);
- writel(0, &bd->buffer_ptr1);
-
- /* Flush modified buffer descriptor */
- flush_dcache_range((unsigned long)bd,
- (unsigned long)bd + sizeof(struct nand_bd));
-
- /* Issue "write" command */
- NAND_REG_WRITE(AC_FIFO, B_CT_WRITE | B_WFR | B_IWC | B_LC | (len-1));
-
- /* Wait for NAND command and DMA to complete */
- while (!nand_flag_is_set(NAND_ISR_CMDDONE))
- ;
- while (!nand_flag_is_set(NAND_ISR_TXDMACOMPLETE))
- ;
-
- bounce_buffer_stop(&bbstate);
-}
-
-/**
- * axs101_nand_read_buf - read chip data into buffer
- * @mtd: MTD device structure
- * @buf: buffer to store data
- * @len: number of bytes to read
- */
-static void axs101_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
-{
- struct bounce_buffer bbstate;
-
- bounce_buffer_start(&bbstate, buf, len, GEN_BB_WRITE);
-
- /* Setup buffer descriptor */
- writel(BD_STAT_OWN | BD_STAT_BD_COMPLETE, &bd->status);
- writel(ALIGN(len, BUS_WIDTH) & BD_SIZES_BUFFER1_MASK, &bd->sizes);
- writel(bbstate.bounce_buffer, &bd->buffer_ptr0);
- writel(0, &bd->buffer_ptr1);
-
- /* Flush modified buffer descriptor */
- flush_dcache_range((unsigned long)bd,
- (unsigned long)bd + sizeof(struct nand_bd));
-
- /* Issue "read" command */
- NAND_REG_WRITE(AC_FIFO, B_CT_READ | B_WFR | B_IWC | B_LC | (len - 1));
-
- /* Wait for NAND command and DMA to complete */
- while (!nand_flag_is_set(NAND_ISR_CMDDONE))
- ;
- while (!nand_flag_is_set(NAND_ISR_RXDMACOMPLETE))
- ;
-
- bounce_buffer_stop(&bbstate);
-}
-
-/**
- * axs101_nand_read_byte - read one byte from the chip
- * @mtd: MTD device structure
- */
-static u_char axs101_nand_read_byte(struct mtd_info *mtd)
-{
- u8 byte;
-
- axs101_nand_read_buf(mtd, (uchar *)&byte, sizeof(byte));
- return byte;
-}
-
-/**
- * axs101_nand_read_word - read one word from the chip
- * @mtd: MTD device structure
- */
-static u16 axs101_nand_read_word(struct mtd_info *mtd)
-{
- u16 word;
-
- axs101_nand_read_buf(mtd, (uchar *)&word, sizeof(word));
- return word;
-}
-
-/**
- * axs101_nand_hwcontrol - NAND control functions wrapper.
- * @mtd: MTD device structure
- * @cmd: Command
- */
-static void axs101_nand_hwcontrol(struct mtd_info *mtdinfo, int cmd,
- unsigned int ctrl)
-{
- if (cmd == NAND_CMD_NONE)
- return;
-
- cmd = cmd & 0xff;
-
- switch (ctrl & (NAND_ALE | NAND_CLE)) {
- /* Address */
- case NAND_ALE:
- cmd |= B_CT_ADDRESS;
- break;
-
- /* Command */
- case NAND_CLE:
- cmd |= B_CT_COMMAND | B_WFR;
-
- break;
-
- default:
- debug("%s: unknown ctrl %#x\n", __func__, ctrl);
- }
-
- NAND_REG_WRITE(AC_FIFO, cmd | B_LC);
- while (!nand_flag_is_set(NAND_ISR_CMDDONE))
- ;
-}
-
-int board_nand_init(struct nand_chip *nand)
-{
- bd = (struct nand_bd *)memalign(ARCH_DMA_MINALIGN,
- sizeof(struct nand_bd));
-
- /* Set buffer descriptor address in IDMAC */
- NAND_REG_WRITE(IDMAC_BDADDR, bd);
-
- nand->ecc.mode = NAND_ECC_SOFT;
- nand->cmd_ctrl = axs101_nand_hwcontrol;
- nand->read_byte = axs101_nand_read_byte;
- nand->read_word = axs101_nand_read_word;
- nand->write_buf = axs101_nand_write_buf;
- nand->read_buf = axs101_nand_read_buf;
-
- /* MBv3 has NAND IC with 16-bit data bus */
- if (gd->board_type == AXS_MB_V3)
- nand->options |= NAND_BUSWIDTH_16;
-
- return 0;
-}
projects / u-boot.git / commitdiff
