/* * (C) Copyright 2008 * Sergei Poselenov, Emcraft Systems, sposelenov@emcraft.com. * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #if defined(CONFIG_SYS_NAND_BASE) #include <nand.h> #include <asm/errno.h> #include <asm/io.h> static int state; static void sc_nand_write_byte(struct mtd_info *mtd, u_char byte); static void sc_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len); static u_char sc_nand_read_byte(struct mtd_info *mtd); static u16 sc_nand_read_word(struct mtd_info *mtd); static void sc_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len); static int sc_nand_device_ready(struct mtd_info *mtdinfo); #define FPGA_NAND_CMD_MASK (0x7 << 28) #define FPGA_NAND_CMD_COMMAND (0x0 << 28) #define FPGA_NAND_CMD_ADDR (0x1 << 28) #define FPGA_NAND_CMD_READ (0x2 << 28) #define FPGA_NAND_CMD_WRITE (0x3 << 28) #define FPGA_NAND_BUSY (0x1 << 15) #define FPGA_NAND_ENABLE (0x1 << 31) #define FPGA_NAND_DATA_SHIFT 16 /** * sc_nand_write_byte - write one byte to the chip * @mtd: MTD device structure * @byte: pointer to data byte to write */ static void sc_nand_write_byte(struct mtd_info *mtd, u_char byte) { sc_nand_write_buf(mtd, (const uchar *)&byte, sizeof(byte)); } /** * sc_nand_write_buf - write buffer to chip * @mtd: MTD device structure * @buf: data buffer * @len: number of bytes to write */ static void sc_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) { int i; struct nand_chip *this = mtd->priv; for (i = 0; i < len; i++) { out_be32(this->IO_ADDR_W, state | (buf[i] << FPGA_NAND_DATA_SHIFT)); } } /** * sc_nand_read_byte - read one byte from the chip * @mtd: MTD device structure */ static u_char sc_nand_read_byte(struct mtd_info *mtd) { u8 byte; sc_nand_read_buf(mtd, (uchar *)&byte, sizeof(byte)); return byte; } /** * sc_nand_read_word - read one word from the chip * @mtd: MTD device structure */ static u16 sc_nand_read_word(struct mtd_info *mtd) { u16 word; sc_nand_read_buf(mtd, (uchar *)&word, sizeof(word)); return word; } /** * sc_nand_read_buf - read chip data into buffer * @mtd: MTD device structure * @buf: buffer to store date * @len: number of bytes to read */ static void sc_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) { int i; struct nand_chip *this = mtd->priv; int val; val = (state & FPGA_NAND_ENABLE) | FPGA_NAND_CMD_READ; out_be32(this->IO_ADDR_W, val); for (i = 0; i < len; i++) { buf[i] = (in_be32(this->IO_ADDR_R) >> FPGA_NAND_DATA_SHIFT) & 0xff; } } /** * sc_nand_device_ready - Check the NAND device is ready for next command. * @mtd: MTD device structure */ static int sc_nand_device_ready(struct mtd_info *mtdinfo) { struct nand_chip *this = mtdinfo->priv; if (in_be32(this->IO_ADDR_W) & FPGA_NAND_BUSY) return 0; /* busy */ return 1; } /** * sc_nand_hwcontrol - NAND control functions wrapper. * @mtd: MTD device structure * @cmd: Command */ static void sc_nand_hwcontrol(struct mtd_info *mtdinfo, int cmd, unsigned int ctrl) { if (ctrl & NAND_CTRL_CHANGE) { state &= ~(FPGA_NAND_CMD_MASK | FPGA_NAND_ENABLE); switch (ctrl & (NAND_ALE | NAND_CLE)) { case 0: state |= FPGA_NAND_CMD_WRITE; break; case NAND_ALE: state |= FPGA_NAND_CMD_ADDR; break; case NAND_CLE: state |= FPGA_NAND_CMD_COMMAND; break; default: printf("%s: unknown ctrl %#x\n", __FUNCTION__, ctrl); } if (ctrl & NAND_NCE) state |= FPGA_NAND_ENABLE; } if (cmd != NAND_CMD_NONE) sc_nand_write_byte(mtdinfo, cmd); } int board_nand_init(struct nand_chip *nand) { nand->cmd_ctrl = sc_nand_hwcontrol; nand->ecc.mode = NAND_ECC_SOFT; nand->dev_ready = sc_nand_device_ready; nand->read_byte = sc_nand_read_byte; nand->read_word = sc_nand_read_word; nand->write_buf = sc_nand_write_buf; nand->read_buf = sc_nand_read_buf; return 0; } #endif