diff options
Diffstat (limited to 'board/micronas/vct/ebi_onenand.c')
| -rw-r--r-- | board/micronas/vct/ebi_onenand.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/board/micronas/vct/ebi_onenand.c b/board/micronas/vct/ebi_onenand.c new file mode 100644 index 0000000..522b88f --- /dev/null +++ b/board/micronas/vct/ebi_onenand.c @@ -0,0 +1,198 @@ +/* + * (C) Copyright 2008 Stefan Roese <sr@denx.de>, DENX Software Engineering + * + * 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> +#include <asm/io.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/onenand.h> +#include "vct.h" + +#define BURST_SIZE_WORDS 4 + +static u16 ebi_nand_read_word(void __iomem *addr) +{ + reg_write(EBI_CPU_IO_ACCS(EBI_BASE), (EXT_DEVICE_CHANNEL_2 | (u32)addr)); + ebi_wait(); + + return reg_read(EBI_IO_ACCS_DATA(EBI_BASE)) >> 16; +} + +static void ebi_nand_write_word(u16 data, void __iomem * addr) +{ + ebi_wait(); + reg_write(EBI_IO_ACCS_DATA(EBI_BASE), (data << 16)); + reg_write(EBI_CPU_IO_ACCS(EBI_BASE), + EXT_DEVICE_CHANNEL_2 | EBI_CPU_WRITE | (u32)addr); + ebi_wait(); +} + +/* + * EBI initialization for OneNAND FLASH access + */ +int ebi_init_onenand(void) +{ + reg_write(EBI_DEV1_CONFIG1(EBI_BASE), 0x83000); + + reg_write(EBI_DEV2_CONFIG1(EBI_BASE), 0x00403002); + reg_write(EBI_DEV2_CONFIG2(EBI_BASE), 0x50); + + reg_write(EBI_DEV3_CONFIG1(EBI_BASE), 0x00403002); + reg_write(EBI_DEV3_CONFIG2(EBI_BASE), 0x0); /* byte/word ordering */ + + reg_write(EBI_DEV2_TIM1_RD1(EBI_BASE), 0x00504000); + reg_write(EBI_DEV2_TIM1_RD2(EBI_BASE), 0x00001000); + reg_write(EBI_DEV2_TIM1_WR1(EBI_BASE), 0x12002223); + reg_write(EBI_DEV2_TIM1_WR2(EBI_BASE), 0x3FC02220); + reg_write(EBI_DEV3_TIM1_RD1(EBI_BASE), 0x00504000); + reg_write(EBI_DEV3_TIM1_RD2(EBI_BASE), 0x00001000); + reg_write(EBI_DEV3_TIM1_WR1(EBI_BASE), 0x05001000); + reg_write(EBI_DEV3_TIM1_WR2(EBI_BASE), 0x00010200); + + reg_write(EBI_DEV2_TIM_EXT(EBI_BASE), 0xFFF00000); + reg_write(EBI_DEV2_EXT_ACC(EBI_BASE), 0x0FFFFFFF); + + reg_write(EBI_DEV3_TIM_EXT(EBI_BASE), 0xFFF00000); + reg_write(EBI_DEV3_EXT_ACC(EBI_BASE), 0x0FFFFFFF); + + /* prepare DMA configuration for EBI */ + reg_write(EBI_DEV3_FIFO_CONFIG(EBI_BASE), 0x0101ff00); + + /* READ only no byte order change, TAG 1 used */ + reg_write(EBI_DEV3_DMA_CONFIG2(EBI_BASE), 0x00000004); + + reg_write(EBI_TAG1_SYS_ID(EBI_BASE), 0x0); /* SCC DMA channel 0 */ + reg_write(EBI_TAG2_SYS_ID(EBI_BASE), 0x1); + reg_write(EBI_TAG3_SYS_ID(EBI_BASE), 0x2); + reg_write(EBI_TAG4_SYS_ID(EBI_BASE), 0x3); + + return 0; +} + +static void *memcpy_16_from_onenand(void *dst, const void *src, unsigned int len) +{ + void *ret = dst; + u16 *d = dst; + u16 *s = (u16 *)src; + + len >>= 1; + while (len-- > 0) + *d++ = ebi_nand_read_word(s++); + + return ret; +} + +static void *memcpy_32_from_onenand(void *dst, const void *src, unsigned int len) +{ + void *ret = dst; + u32 *d = (u32 *)dst; + u32 s = (u32)src; + u32 bytes_per_block = BURST_SIZE_WORDS * sizeof(int); + u32 n_blocks = len / bytes_per_block; + u32 block = 0; + u32 burst_word; + + for (block = 0; block < n_blocks; block++) { + /* Trigger read channel 3 */ + reg_write(EBI_CPU_IO_ACCS(EBI_BASE), + (EXT_DEVICE_CHANNEL_3 | (s + (block * bytes_per_block)))); + /* Poll status to see whether read has finished */ + ebi_wait(); + + /* Squirrel the data away in a safe place */ + for (burst_word = 0; burst_word < BURST_SIZE_WORDS; burst_word++) + *d++ = reg_read(EBI_IO_ACCS_DATA(EBI_BASE)); + } + + return ret; +} + +static void *memcpy_16_to_onenand(void *dst, const void *src, unsigned int len) +{ + void *ret = dst; + u16 *d = dst; + u16 *s = (u16 *)src; + + len >>= 1; + while (len-- > 0) + ebi_nand_write_word(*s++, d++); + + return ret; +} + +static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area) +{ + struct onenand_chip *this = mtd->priv; + + if (ONENAND_CURRENT_BUFFERRAM(this)) { + if (area == ONENAND_DATARAM) + return mtd->writesize; + if (area == ONENAND_SPARERAM) + return mtd->oobsize; + } + + return 0; +} + +static int ebi_read_bufferram(struct mtd_info *mtd, loff_t addr, int area, + unsigned char *buffer, int offset, + size_t count) +{ + struct onenand_chip *this = mtd->priv; + void __iomem *bufferram; + + bufferram = this->base + area; + bufferram += onenand_bufferram_offset(mtd, area); + + if (count < 4) + memcpy_16_from_onenand(buffer, bufferram + offset, count); + else + memcpy_32_from_onenand(buffer, bufferram + offset, count); + + return 0; +} + +static int ebi_write_bufferram(struct mtd_info *mtd, loff_t addr, int area, + const unsigned char *buffer, int offset, + size_t count) +{ + struct onenand_chip *this = mtd->priv; + void __iomem *bufferram; + + bufferram = this->base + area; + bufferram += onenand_bufferram_offset(mtd, area); + + memcpy_16_to_onenand(bufferram + offset, buffer, count); + + return 0; +} + +void onenand_board_init(struct mtd_info *mtd) +{ + struct onenand_chip *chip = mtd->priv; + + /* + * Insert board specific OneNAND access functions + */ + chip->read_word = ebi_nand_read_word; + chip->write_word = ebi_nand_write_word; + + chip->read_bufferram = ebi_read_bufferram; + chip->read_spareram = ebi_read_bufferram; + chip->write_bufferram = ebi_write_bufferram; +} |