/* * drivers/mtd/nand/sharpsl.c * * Copyright (C) 2004 Richard Purdie * * $Id: sharpsl.c,v 1.7 2005/11/07 11:14:31 gleixner Exp $ * * Based on Sharp's NAND driver sharp_sl.c * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include <linux/genhd.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/delay.h> #include <linux/mtd/mtd.h> #include <linux/mtd/nand.h> #include <linux/mtd/nand_ecc.h> #include <linux/mtd/partitions.h> #include <linux/interrupt.h> #include <asm/io.h> #include <asm/hardware.h> #include <asm/mach-types.h> static void __iomem *sharpsl_io_base; static int sharpsl_phys_base = 0x0C000000; /* register offset */ #define ECCLPLB sharpsl_io_base+0x00 /* line parity 7 - 0 bit */ #define ECCLPUB sharpsl_io_base+0x04 /* line parity 15 - 8 bit */ #define ECCCP sharpsl_io_base+0x08 /* column parity 5 - 0 bit */ #define ECCCNTR sharpsl_io_base+0x0C /* ECC byte counter */ #define ECCCLRR sharpsl_io_base+0x10 /* cleare ECC */ #define FLASHIO sharpsl_io_base+0x14 /* Flash I/O */ #define FLASHCTL sharpsl_io_base+0x18 /* Flash Control */ /* Flash control bit */ #define FLRYBY (1 << 5) #define FLCE1 (1 << 4) #define FLWP (1 << 3) #define FLALE (1 << 2) #define FLCLE (1 << 1) #define FLCE0 (1 << 0) /* * MTD structure for SharpSL */ static struct mtd_info *sharpsl_mtd = NULL; /* * Define partitions for flash device */ #define DEFAULT_NUM_PARTITIONS 3 static int nr_partitions; static struct mtd_partition sharpsl_nand_default_partition_info[] = { { .name = "System Area", .offset = 0, .size = 7 * 1024 * 1024, }, { .name = "Root Filesystem", .offset = 7 * 1024 * 1024, .size = 30 * 1024 * 1024, }, { .name = "Home Filesystem", .offset = MTDPART_OFS_APPEND, .size = MTDPART_SIZ_FULL, }, }; /* * hardware specific access to control-lines * ctrl: * NAND_CNE: bit 0 -> ! bit 0 & 4 * NAND_CLE: bit 1 -> bit 1 * NAND_ALE: bit 2 -> bit 2 * */ static void sharpsl_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) { struct nand_chip *chip = mtd->priv; if (ctrl & NAND_CTRL_CHANGE) { unsigned char bits = ctrl & 0x07; bits |= (ctrl & 0x01) << 4; bits ^= 0x11; writeb((readb(FLASHCTL) & ~0x17) | bits, FLASHCTL); } if (cmd != NAND_CMD_NONE) writeb(cmd, chip->IO_ADDR_W); } static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; static struct nand_bbt_descr sharpsl_bbt = { .options = 0, .offs = 4, .len = 2, .pattern = scan_ff_pattern }; static struct nand_bbt_descr sharpsl_akita_bbt = { .options = 0, .offs = 4, .len = 1, .pattern = scan_ff_pattern }; static struct nand_ecclayout akita_oobinfo = { .eccbytes = 24, .eccpos = { 0x5, 0x1, 0x2, 0x3, 0x6, 0x7, 0x15, 0x11, 0x12, 0x13, 0x16, 0x17, 0x25, 0x21, 0x22, 0x23, 0x26, 0x27, 0x35, 0x31, 0x32, 0x33, 0x36, 0x37}, .oobfree = {{0x08, 0x09}} }; static int sharpsl_nand_dev_ready(struct mtd_info *mtd) { return !((readb(FLASHCTL) & FLRYBY) == 0); } static void sharpsl_nand_enable_hwecc(struct mtd_info *mtd, int mode) { writeb(0, ECCCLRR); } static int sharpsl_nand_calculate_ecc(struct mtd_info *mtd, const u_char * dat, u_char * ecc_code) { ecc_code[0] = ~readb(ECCLPUB); ecc_code[1] = ~readb(ECCLPLB); ecc_code[2] = (~readb(ECCCP) << 2) | 0x03; return readb(ECCCNTR) != 0; } #ifdef CONFIG_MTD_PARTITIONS const char *part_probes[] = { "cmdlinepart", NULL }; #endif /* * Main initialization routine */ static int __init sharpsl_nand_init(void) { struct nand_chip *this; struct mtd_partition *sharpsl_partition_info; int err = 0; /* Allocate memory for MTD device structure and private data */ sharpsl_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL); if (!sharpsl_mtd) { printk("Unable to allocate SharpSL NAND MTD device structure.\n"); return -ENOMEM; } /* map physical adress */ sharpsl_io_base = ioremap(sharpsl_phys_base, 0x1000); if (!sharpsl_io_base) { printk("ioremap to access Sharp SL NAND chip failed\n"); kfree(sharpsl_mtd); return -EIO; } /* Get pointer to private data */ this = (struct nand_chip *)(&sharpsl_mtd[1]); /* Initialize structures */ memset(sharpsl_mtd, 0, sizeof(struct mtd_info)); memset(this, 0, sizeof(struct nand_chip)); /* Link the private data with the MTD structure */ sharpsl_mtd->priv = this; sharpsl_mtd->owner = THIS_MODULE; /* * PXA initialize */ writeb(readb(FLASHCTL) | FLWP, FLASHCTL); /* Set address of NAND IO lines */ this->IO_ADDR_R = FLASHIO; this->IO_ADDR_W = FLASHIO; /* Set address of hardware control function */ this->cmd_ctrl = sharpsl_nand_hwcontrol; this->dev_ready = sharpsl_nand_dev_ready; /* 15 us command delay time */ this->chip_delay = 15; /* set eccmode using hardware ECC */ this->ecc.mode = NAND_ECC_HW; this->ecc.size = 256; this->ecc.bytes = 3; this->badblock_pattern = &sharpsl_bbt; if (machine_is_akita() || machine_is_borzoi()) { this->badblock_pattern = &sharpsl_akita_bbt; this->ecc.layout = &akita_oobinfo; } this->ecc.hwctl = sharpsl_nand_enable_hwecc; this->ecc.calculate = sharpsl_nand_calculate_ecc; this->ecc.correct = nand_correct_data; /* Scan to find existence of the device */ err = nand_scan(sharpsl_mtd, 1); if (err) { iounmap(sharpsl_io_base); kfree(sharpsl_mtd); return err; } /* Register the partitions */ sharpsl_mtd->name = "sharpsl-nand"; nr_partitions = parse_mtd_partitions(sharpsl_mtd, part_probes, &sharpsl_partition_info, 0); if (nr_partitions <= 0) { nr_partitions = DEFAULT_NUM_PARTITIONS; sharpsl_partition_info = sharpsl_nand_default_partition_info; if (machine_is_poodle()) { sharpsl_partition_info[1].size = 22 * 1024 * 1024; } else if (machine_is_corgi() || machine_is_shepherd()) { sharpsl_partition_info[1].size = 25 * 1024 * 1024; } else if (machine_is_husky()) { sharpsl_partition_info[1].size = 53 * 1024 * 1024; } else if (machine_is_spitz()) { sharpsl_partition_info[1].size = 5 * 1024 * 1024; } else if (machine_is_akita()) { sharpsl_partition_info[1].size = 58 * 1024 * 1024; } else if (machine_is_borzoi()) { sharpsl_partition_info[1].size = 32 * 1024 * 1024; } } add_mtd_partitions(sharpsl_mtd, sharpsl_partition_info, nr_partitions); /* Return happy */ return 0; } module_init(sharpsl_nand_init); /* * Clean up routine */ static void __exit sharpsl_nand_cleanup(void) { /* Release resources, unregister device */ nand_release(sharpsl_mtd); iounmap(sharpsl_io_base); /* Free the MTD device structure */ kfree(sharpsl_mtd); } module_exit(sharpsl_nand_cleanup); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>"); MODULE_DESCRIPTION("Device specific logic for NAND flash on Sharp SL-C7xx Series");