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-rw-r--r--cpu/ppc4xx/ndfc.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/cpu/ppc4xx/ndfc.c b/cpu/ppc4xx/ndfc.c
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+/*
+ * Overview:
+ * Platform independend driver for NDFC (NanD Flash Controller)
+ * integrated into EP440 cores
+ *
+ * (C) Copyright 2006
+ * Stefan Roese, DENX Software Engineering, sr@denx.de.
+ *
+ * Based on original work by
+ * Thomas Gleixner
+ * Copyright 2006 IBM
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
+
+#include <nand.h>
+#include <linux/mtd/ndfc.h>
+#include <asm/processor.h>
+#include <ppc440.h>
+
+static u8 hwctl = 0;
+
+static void ndfc_hwcontrol(struct mtd_info *mtdinfo, int cmd)
+{
+ switch (cmd) {
+ case NAND_CTL_SETCLE:
+ hwctl |= 0x1;
+ break;
+
+ case NAND_CTL_CLRCLE:
+ hwctl &= ~0x1;
+ break;
+
+ case NAND_CTL_SETALE:
+ hwctl |= 0x2;
+ break;
+
+ case NAND_CTL_CLRALE:
+ hwctl &= ~0x2;
+ break;
+ }
+}
+
+static void ndfc_write_byte(struct mtd_info *mtdinfo, u_char byte)
+{
+ struct nand_chip *this = mtdinfo->priv;
+ ulong base = (ulong) this->IO_ADDR_W;
+
+ if (hwctl & 0x1)
+ out8(base + NDFC_CMD, byte);
+ else if (hwctl & 0x2)
+ out8(base + NDFC_ALE, byte);
+ else
+ out8(base + NDFC_DATA, byte);
+}
+
+static u_char ndfc_read_byte(struct mtd_info *mtdinfo)
+{
+ struct nand_chip *this = mtdinfo->priv;
+ ulong base = (ulong) this->IO_ADDR_W;
+
+ return (in8(base + NDFC_DATA));
+}
+
+static int ndfc_dev_ready(struct mtd_info *mtdinfo)
+{
+ struct nand_chip *this = mtdinfo->priv;
+ ulong base = (ulong) this->IO_ADDR_W;
+
+ while (!(in32(base + NDFC_STAT) & NDFC_STAT_IS_READY))
+ ;
+
+ return 1;
+}
+
+#ifndef CONFIG_NAND_SPL
+/*
+ * Don't use these speedup functions in NAND boot image, since the image
+ * has to fit into 4kByte.
+ */
+
+/*
+ * Speedups for buffer read/write/verify
+ *
+ * NDFC allows 32bit read/write of data. So we can speed up the buffer
+ * functions. No further checking, as nand_base will always read/write
+ * page aligned.
+ */
+static void ndfc_read_buf(struct mtd_info *mtdinfo, uint8_t *buf, int len)
+{
+ struct nand_chip *this = mtdinfo->priv;
+ ulong base = (ulong) this->IO_ADDR_W;
+ uint32_t *p = (uint32_t *) buf;
+
+ for(;len > 0; len -= 4)
+ *p++ = in32(base + NDFC_DATA);
+}
+
+static void ndfc_write_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len)
+{
+ struct nand_chip *this = mtdinfo->priv;
+ ulong base = (ulong) this->IO_ADDR_W;
+ uint32_t *p = (uint32_t *) buf;
+
+ for(; len > 0; len -= 4)
+ out32(base + NDFC_DATA, *p++);
+}
+
+static int ndfc_verify_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len)
+{
+ struct nand_chip *this = mtdinfo->priv;
+ ulong base = (ulong) this->IO_ADDR_W;
+ uint32_t *p = (uint32_t *) buf;
+
+ for(; len > 0; len -= 4)
+ if (*p++ != in32(base + NDFC_DATA))
+ return -1;
+
+ return 0;
+}
+#endif /* #ifndef CONFIG_NAND_SPL */
+
+void board_nand_init(struct nand_chip *nand)
+{
+ nand->eccmode = NAND_ECC_SOFT;
+
+ nand->hwcontrol = ndfc_hwcontrol;
+ nand->read_byte = ndfc_read_byte;
+ nand->write_byte = ndfc_write_byte;
+ nand->dev_ready = ndfc_dev_ready;
+
+#ifndef CONFIG_NAND_SPL
+ nand->write_buf = ndfc_write_buf;
+ nand->read_buf = ndfc_read_buf;
+ nand->verify_buf = ndfc_verify_buf;
+#else
+ /*
+ * Setup EBC (CS0 only right now)
+ */
+ mtdcr(ebccfga, xbcfg);
+ mtdcr(ebccfgd, 0xb8400000);
+
+ mtebc(pb0cr, CFG_EBC_PB0CR);
+ mtebc(pb0ap, CFG_EBC_PB0AP);
+#endif
+
+ /* Set NandFlash Core Configuration Register */
+ /* Chip select 3, 1col x 2 rows */
+ out32(CFG_NAND_BASE + NDFC_CCR, 0x00000000 | (CFG_NAND_CS << 24));
+ out32(CFG_NAND_BASE + NDFC_BCFG0 + (CFG_NAND_CS << 2), 0x80002222);
+}
+
+#endif