/* * drivers/mtd/tx4925ndfmc.c * * Overview: * This is a device driver for the NAND flash device found on the * Toshiba RBTX4925 reference board, which is a SmartMediaCard. It supports * 16MiB, 32MiB and 64MiB cards. * * Author: MontaVista Software, Inc. source@mvista.com * * Derived from drivers/mtd/autcpu12.c * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de) * * $Id: tx4925ndfmc.c,v 1.5 2004/10/05 13:50:20 gleixner Exp $ * * Copyright (C) 2001 Toshiba Corporation * * 2003 (c) MontaVista Software, Inc. This file is licensed under * the terms of the GNU General Public License version 2. This program * is licensed "as is" without any warranty of any kind, whether express * or implied. * */ #include #include #include #include #include #include #include #include #include extern struct nand_oobinfo jffs2_oobinfo; /* * MTD structure for RBTX4925 board */ static struct mtd_info *tx4925ndfmc_mtd = NULL; /* * Define partitions for flash devices */ static struct mtd_partition partition_info16k[] = { { .name = "RBTX4925 flash partition 1", .offset = 0, .size = 8 * 0x00100000 }, { .name = "RBTX4925 flash partition 2", .offset = 8 * 0x00100000, .size = 8 * 0x00100000 }, }; static struct mtd_partition partition_info32k[] = { { .name = "RBTX4925 flash partition 1", .offset = 0, .size = 8 * 0x00100000 }, { .name = "RBTX4925 flash partition 2", .offset = 8 * 0x00100000, .size = 24 * 0x00100000 }, }; static struct mtd_partition partition_info64k[] = { { .name = "User FS", .offset = 0, .size = 16 * 0x00100000 }, { .name = "RBTX4925 flash partition 2", .offset = 16 * 0x00100000, .size = 48 * 0x00100000}, }; static struct mtd_partition partition_info128k[] = { { .name = "Skip bad section", .offset = 0, .size = 16 * 0x00100000 }, { .name = "User FS", .offset = 16 * 0x00100000, .size = 112 * 0x00100000 }, }; #define NUM_PARTITIONS16K 2 #define NUM_PARTITIONS32K 2 #define NUM_PARTITIONS64K 2 #define NUM_PARTITIONS128K 2 /* * hardware specific access to control-lines */ static void tx4925ndfmc_hwcontrol(struct mtd_info *mtd, int cmd) { switch(cmd){ case NAND_CTL_SETCLE: tx4925_ndfmcptr->mcr |= TX4925_NDFMCR_CLE; break; case NAND_CTL_CLRCLE: tx4925_ndfmcptr->mcr &= ~TX4925_NDFMCR_CLE; break; case NAND_CTL_SETALE: tx4925_ndfmcptr->mcr |= TX4925_NDFMCR_ALE; break; case NAND_CTL_CLRALE: tx4925_ndfmcptr->mcr &= ~TX4925_NDFMCR_ALE; break; case NAND_CTL_SETNCE: tx4925_ndfmcptr->mcr |= TX4925_NDFMCR_CE; break; case NAND_CTL_CLRNCE: tx4925_ndfmcptr->mcr &= ~TX4925_NDFMCR_CE; break; case NAND_CTL_SETWP: tx4925_ndfmcptr->mcr |= TX4925_NDFMCR_WE; break; case NAND_CTL_CLRWP: tx4925_ndfmcptr->mcr &= ~TX4925_NDFMCR_WE; break; } } /* * read device ready pin */ static int tx4925ndfmc_device_ready(struct mtd_info *mtd) { int ready; ready = (tx4925_ndfmcptr->sr & TX4925_NDSFR_BUSY) ? 0 : 1; return ready; } void tx4925ndfmc_enable_hwecc(struct mtd_info *mtd, int mode) { /* reset first */ tx4925_ndfmcptr->mcr |= TX4925_NDFMCR_ECC_CNTL_MASK; tx4925_ndfmcptr->mcr &= ~TX4925_NDFMCR_ECC_CNTL_MASK; tx4925_ndfmcptr->mcr |= TX4925_NDFMCR_ECC_CNTL_ENAB; } static void tx4925ndfmc_disable_ecc(void) { tx4925_ndfmcptr->mcr &= ~TX4925_NDFMCR_ECC_CNTL_MASK; } static void tx4925ndfmc_enable_read_ecc(void) { tx4925_ndfmcptr->mcr &= ~TX4925_NDFMCR_ECC_CNTL_MASK; tx4925_ndfmcptr->mcr |= TX4925_NDFMCR_ECC_CNTL_READ; } void tx4925ndfmc_readecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code){ int i; u_char *ecc = ecc_code; tx4925ndfmc_enable_read_ecc(); for (i = 0;i < 6;i++,ecc++) *ecc = tx4925_read_nfmc(&(tx4925_ndfmcptr->dtr)); tx4925ndfmc_disable_ecc(); } void tx4925ndfmc_device_setup(void) { *(unsigned char *)0xbb005000 &= ~0x08; /* reset NDFMC */ tx4925_ndfmcptr->rstr |= TX4925_NDFRSTR_RST; while (tx4925_ndfmcptr->rstr & TX4925_NDFRSTR_RST); /* setup BusSeparete, Hold Time, Strobe Pulse Width */ tx4925_ndfmcptr->mcr = TX4925_BSPRT ? TX4925_NDFMCR_BSPRT : 0; tx4925_ndfmcptr->spr = TX4925_HOLD << 4 | TX4925_SPW; } static u_char tx4925ndfmc_nand_read_byte(struct mtd_info *mtd) { struct nand_chip *this = mtd->priv; return tx4925_read_nfmc(this->IO_ADDR_R); } static void tx4925ndfmc_nand_write_byte(struct mtd_info *mtd, u_char byte) { struct nand_chip *this = mtd->priv; tx4925_write_nfmc(byte, this->IO_ADDR_W); } static void tx4925ndfmc_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) { int i; struct nand_chip *this = mtd->priv; for (i=0; iIO_ADDR_W); } static void tx4925ndfmc_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) { int i; struct nand_chip *this = mtd->priv; for (i=0; iIO_ADDR_R); } static int tx4925ndfmc_nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len) { int i; struct nand_chip *this = mtd->priv; for (i=0; iIO_ADDR_R)) return -EFAULT; return 0; } /* * Send command to NAND device */ static void tx4925ndfmc_nand_command (struct mtd_info *mtd, unsigned command, int column, int page_addr) { register struct nand_chip *this = mtd->priv; /* Begin command latch cycle */ this->hwcontrol(mtd, NAND_CTL_SETCLE); /* * Write out the command to the device. */ if (command == NAND_CMD_SEQIN) { int readcmd; if (column >= mtd->oobblock) { /* OOB area */ column -= mtd->oobblock; readcmd = NAND_CMD_READOOB; } else if (column < 256) { /* First 256 bytes --> READ0 */ readcmd = NAND_CMD_READ0; } else { column -= 256; readcmd = NAND_CMD_READ1; } this->write_byte(mtd, readcmd); } this->write_byte(mtd, command); /* Set ALE and clear CLE to start address cycle */ this->hwcontrol(mtd, NAND_CTL_CLRCLE); if (column != -1 || page_addr != -1) { this->hwcontrol(mtd, NAND_CTL_SETALE); /* Serially input address */ if (column != -1) this->write_byte(mtd, column); if (page_addr != -1) { this->write_byte(mtd, (unsigned char) (page_addr & 0xff)); this->write_byte(mtd, (unsigned char) ((page_addr >> 8) & 0xff)); /* One more address cycle for higher density devices */ if (mtd->size & 0x0c000000) this->write_byte(mtd, (unsigned char) ((page_addr >> 16) & 0x0f)); } /* Latch in address */ this->hwcontrol(mtd, NAND_CTL_CLRALE); } /* * program and erase have their own busy handlers * status and sequential in needs no delay */ switch (command) { case NAND_CMD_PAGEPROG: /* Turn off WE */ this->hwcontrol (mtd, NAND_CTL_CLRWP); return; case NAND_CMD_SEQIN: /* Turn on WE */ this->hwcontrol (mtd, NAND_CTL_SETWP); return; case NAND_CMD_ERASE1: case NAND_CMD_ERASE2: case NAND_CMD_STATUS: return; case NAND_CMD_RESET: if (this->dev_ready) break; this->hwcontrol(mtd, NAND_CTL_SETCLE); this->write_byte(mtd, NAND_CMD_STATUS); this->hwcontrol(mtd, NAND_CTL_CLRCLE); while ( !(this->read_byte(mtd) & 0x40)); return; /* This applies to read commands */ default: /* * If we don't have access to the busy pin, we apply the given * command delay */ if (!this->dev_ready) { udelay (this->chip_delay); return; } } /* wait until command is processed */ while (!this->dev_ready(mtd)); } #ifdef CONFIG_MTD_CMDLINE_PARTS extern int parse_cmdline_partitions(struct mtd_info *master, struct mtd_partitio n **pparts, char *); #endif /* * Main initialization routine */ extern int nand_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc); int __init tx4925ndfmc_init (void) { struct nand_chip *this; int err = 0; /* Allocate memory for MTD device structure and private data */ tx4925ndfmc_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip), GFP_KERNEL); if (!tx4925ndfmc_mtd) { printk ("Unable to allocate RBTX4925 NAND MTD device structure.\n"); err = -ENOMEM; goto out; } tx4925ndfmc_device_setup(); /* io is indirect via a register so don't need to ioremap address */ /* Get pointer to private data */ this = (struct nand_chip *) (&tx4925ndfmc_mtd[1]); /* Initialize structures */ memset((char *) tx4925ndfmc_mtd, 0, sizeof(struct mtd_info)); memset((char *) this, 0, sizeof(struct nand_chip)); /* Link the private data with the MTD structure */ tx4925ndfmc_mtd->priv = this; /* Set address of NAND IO lines */ this->IO_ADDR_R = (void __iomem *)&(tx4925_ndfmcptr->dtr); this->IO_ADDR_W = (void __iomem *)&(tx4925_ndfmcptr->dtr); this->hwcontrol = tx4925ndfmc_hwcontrol; this->enable_hwecc = tx4925ndfmc_enable_hwecc; this->calculate_ecc = tx4925ndfmc_readecc; this->correct_data = nand_correct_data; this->eccmode = NAND_ECC_HW6_512; this->dev_ready = tx4925ndfmc_device_ready; /* 20 us command delay time */ this->chip_delay = 20; this->read_byte = tx4925ndfmc_nand_read_byte; this->write_byte = tx4925ndfmc_nand_write_byte; this->cmdfunc = tx4925ndfmc_nand_command; this->write_buf = tx4925ndfmc_nand_write_buf; this->read_buf = tx4925ndfmc_nand_read_buf; this->verify_buf = tx4925ndfmc_nand_verify_buf; /* Scan to find existance of the device */ if (nand_scan (tx4925ndfmc_mtd, 1)) { err = -ENXIO; goto out_ior; } /* Register the partitions */ #ifdef CONFIG_MTD_CMDLINE_PARTS { int mtd_parts_nb = 0; struct mtd_partition *mtd_parts = 0; mtd_parts_nb = parse_cmdline_partitions(tx4925ndfmc_mtd, &mtd_parts, "tx4925ndfmc"); if (mtd_parts_nb > 0) add_mtd_partitions(tx4925ndfmc_mtd, mtd_parts, mtd_parts_nb); else add_mtd_device(tx4925ndfmc_mtd); } #else /* ifdef CONFIG_MTD_CMDLINE_PARTS */ switch(tx4925ndfmc_mtd->size){ case 0x01000000: add_mtd_partitions(tx4925ndfmc_mtd, partition_info16k, NUM_PARTITIONS16K); break; case 0x02000000: add_mtd_partitions(tx4925ndfmc_mtd, partition_info32k, NUM_PARTITIONS32K); break; case 0x04000000: add_mtd_partitions(tx4925ndfmc_mtd, partition_info64k, NUM_PARTITIONS64K); break; case 0x08000000: add_mtd_partitions(tx4925ndfmc_mtd, partition_info128k, NUM_PARTITIONS128K); break; default: { printk ("Unsupported SmartMedia device\n"); err = -ENXIO; goto out_ior; } } #endif /* ifdef CONFIG_MTD_CMDLINE_PARTS */ goto out; out_ior: out: return err; } module_init(tx4925ndfmc_init); /* * Clean up routine */ #ifdef MODULE static void __exit tx4925ndfmc_cleanup (void) { /* Release resources, unregister device */ nand_release (tx4925ndfmc_mtd); /* Free the MTD device structure */ kfree (tx4925ndfmc_mtd); } module_exit(tx4925ndfmc_cleanup); #endif MODULE_LICENSE("GPL"); MODULE_AUTHOR("Alice Hennessy "); MODULE_DESCRIPTION("Glue layer for SmartMediaCard on Toshiba RBTX4925");