mirror of
https://github.com/AsahiLinux/u-boot
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228 lines
5.7 KiB
C
228 lines
5.7 KiB
C
/*
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* Overview:
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* Platform independend driver for NDFC (NanD Flash Controller)
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* integrated into EP440 cores
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*
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* (C) Copyright 2006-2007
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* Stefan Roese, DENX Software Engineering, sr@denx.de.
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*
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* Based on original work by
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* Thomas Gleixner
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* Copyright 2006 IBM
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#if (CONFIG_COMMANDS & CFG_CMD_NAND) && !defined(CFG_NAND_LEGACY) && \
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(defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
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defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
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defined(CONFIG_405EZ))
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#include <nand.h>
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#include <linux/mtd/ndfc.h>
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#include <linux/mtd/nand_ecc.h>
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#include <asm/processor.h>
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#include <asm/io.h>
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#include <ppc4xx.h>
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static u8 hwctl = 0;
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static void ndfc_hwcontrol(struct mtd_info *mtdinfo, int cmd)
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{
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switch (cmd) {
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case NAND_CTL_SETCLE:
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hwctl |= 0x1;
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break;
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case NAND_CTL_CLRCLE:
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hwctl &= ~0x1;
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break;
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case NAND_CTL_SETALE:
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hwctl |= 0x2;
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break;
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case NAND_CTL_CLRALE:
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hwctl &= ~0x2;
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break;
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}
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}
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static void ndfc_write_byte(struct mtd_info *mtdinfo, u_char byte)
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{
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struct nand_chip *this = mtdinfo->priv;
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ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
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if (hwctl & 0x1)
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out_8((u8 *)(base + NDFC_CMD), byte);
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else if (hwctl & 0x2)
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out_8((u8 *)(base + NDFC_ALE), byte);
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else
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out_8((u8 *)(base + NDFC_DATA), byte);
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}
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static u_char ndfc_read_byte(struct mtd_info *mtdinfo)
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{
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struct nand_chip *this = mtdinfo->priv;
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ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
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return (in_8((u8 *)(base + NDFC_DATA)));
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}
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static int ndfc_dev_ready(struct mtd_info *mtdinfo)
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{
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struct nand_chip *this = mtdinfo->priv;
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ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
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while (!(in_be32((u32 *)(base + NDFC_STAT)) & NDFC_STAT_IS_READY))
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;
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return 1;
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}
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static void ndfc_enable_hwecc(struct mtd_info *mtdinfo, int mode)
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{
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struct nand_chip *this = mtdinfo->priv;
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ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
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u32 ccr;
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ccr = in_be32((u32 *)(base + NDFC_CCR));
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ccr |= NDFC_CCR_RESET_ECC;
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out_be32((u32 *)(base + NDFC_CCR), ccr);
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}
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static int ndfc_calculate_ecc(struct mtd_info *mtdinfo,
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const u_char *dat, u_char *ecc_code)
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{
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struct nand_chip *this = mtdinfo->priv;
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ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
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u32 ecc;
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u8 *p = (u8 *)&ecc;
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ecc = in_be32((u32 *)(base + NDFC_ECC));
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/* The NDFC uses Smart Media (SMC) bytes order
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*/
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ecc_code[0] = p[2];
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ecc_code[1] = p[1];
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ecc_code[2] = p[3];
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return 0;
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}
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/*
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* Speedups for buffer read/write/verify
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*
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* NDFC allows 32bit read/write of data. So we can speed up the buffer
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* functions. No further checking, as nand_base will always read/write
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* page aligned.
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*/
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static void ndfc_read_buf(struct mtd_info *mtdinfo, uint8_t *buf, int len)
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{
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struct nand_chip *this = mtdinfo->priv;
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ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
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uint32_t *p = (uint32_t *) buf;
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for (;len > 0; len -= 4)
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*p++ = in_be32((u32 *)(base + NDFC_DATA));
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}
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#ifndef CONFIG_NAND_SPL
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/*
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* Don't use these speedup functions in NAND boot image, since the image
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* has to fit into 4kByte.
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*/
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static void ndfc_write_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len)
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{
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struct nand_chip *this = mtdinfo->priv;
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ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
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uint32_t *p = (uint32_t *) buf;
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for (; len > 0; len -= 4)
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out_be32((u32 *)(base + NDFC_DATA), *p++);
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}
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static int ndfc_verify_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len)
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{
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struct nand_chip *this = mtdinfo->priv;
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ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
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uint32_t *p = (uint32_t *) buf;
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for (; len > 0; len -= 4)
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if (*p++ != in_be32((u32 *)(base + NDFC_DATA)))
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return -1;
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return 0;
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}
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#endif /* #ifndef CONFIG_NAND_SPL */
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void board_nand_select_device(struct nand_chip *nand, int chip)
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{
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/*
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* Don't use "chip" to address the NAND device,
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* generate the cs from the address where it is encoded.
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*/
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int cs = (ulong)nand->IO_ADDR_W & 0x00000003;
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ulong base = (ulong)nand->IO_ADDR_W & 0xfffffffc;
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/* Set NandFlash Core Configuration Register */
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/* 1 col x 2 rows */
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out_be32((u32 *)(base + NDFC_CCR), 0x00000000 | (cs << 24));
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}
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int board_nand_init(struct nand_chip *nand)
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{
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int cs = (ulong)nand->IO_ADDR_W & 0x00000003;
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ulong base = (ulong)nand->IO_ADDR_W & 0xfffffffc;
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nand->hwcontrol = ndfc_hwcontrol;
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nand->read_byte = ndfc_read_byte;
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nand->read_buf = ndfc_read_buf;
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nand->write_byte = ndfc_write_byte;
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nand->dev_ready = ndfc_dev_ready;
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nand->eccmode = NAND_ECC_HW3_256;
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nand->enable_hwecc = ndfc_enable_hwecc;
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nand->calculate_ecc = ndfc_calculate_ecc;
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nand->correct_data = nand_correct_data;
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#ifndef CONFIG_NAND_SPL
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nand->write_buf = ndfc_write_buf;
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nand->verify_buf = ndfc_verify_buf;
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#else
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/*
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* Setup EBC (CS0 only right now)
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*/
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mtebc(EBC0_CFG, 0xb8400000);
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mtebc(pb0cr, CFG_EBC_PB0CR);
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mtebc(pb0ap, CFG_EBC_PB0AP);
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#endif
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/*
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* Select required NAND chip in NDFC
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*/
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board_nand_select_device(nand, cs);
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out_be32((u32 *)(base + NDFC_BCFG0 + (cs << 2)), 0x80002222);
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return 0;
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}
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#endif
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