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Diffstat (limited to 'drivers/mtd/nand/spia.c')
| -rw-r--r-- | drivers/mtd/nand/spia.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/mtd/nand/spia.c b/drivers/mtd/nand/spia.c new file mode 100644 index 0000000..b777c41 --- /dev/null +++ b/drivers/mtd/nand/spia.c @@ -0,0 +1,173 @@ +/* + * drivers/mtd/nand/spia.c + * + * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com) + * + * + * 10-29-2001 TG change to support hardwarespecific access + * to controllines (due to change in nand.c) + * page_cache added + * + * $Id: spia.c,v 1.24 2004/11/04 12:53:10 gleixner Exp $ + * + * 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. + * + * Overview: + * This is a device driver for the NAND flash device found on the + * SPIA board which utilizes the Toshiba TC58V64AFT part. This is + * a 64Mibit (8MiB x 8 bits) NAND flash device. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> +#include <asm/io.h> + +/* + * MTD structure for SPIA board + */ +static struct mtd_info *spia_mtd = NULL; + +/* + * Values specific to the SPIA board (used with EP7212 processor) + */ +#define SPIA_IO_BASE 0xd0000000 /* Start of EP7212 IO address space */ +#define SPIA_FIO_BASE 0xf0000000 /* Address where flash is mapped */ +#define SPIA_PEDR 0x0080 /* + * IO offset to Port E data register + * where the CLE, ALE and NCE pins + * are wired to. + */ +#define SPIA_PEDDR 0x00c0 /* + * IO offset to Port E data direction + * register so we can control the IO + * lines. + */ + +/* + * Module stuff + */ + +static int spia_io_base = SPIA_IO_BASE; +static int spia_fio_base = SPIA_FIO_BASE; +static int spia_pedr = SPIA_PEDR; +static int spia_peddr = SPIA_PEDDR; + +module_param(spia_io_base, int, 0); +module_param(spia_fio_base, int, 0); +module_param(spia_pedr, int, 0); +module_param(spia_peddr, int, 0); + +/* + * Define partitions for flash device + */ +const static struct mtd_partition partition_info[] = { + { + .name = "SPIA flash partition 1", + .offset = 0, + .size = 2*1024*1024 + }, + { + .name = "SPIA flash partition 2", + .offset = 2*1024*1024, + .size = 6*1024*1024 + } +}; +#define NUM_PARTITIONS 2 + + +/* + * hardware specific access to control-lines +*/ +static void spia_hwcontrol(struct mtd_info *mtd, int cmd){ + + switch(cmd){ + + case NAND_CTL_SETCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x01; break; + case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x01; break; + + case NAND_CTL_SETALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x02; break; + case NAND_CTL_CLRALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x02; break; + + case NAND_CTL_SETNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x04; break; + case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x04; break; + } +} + +/* + * Main initialization routine + */ +int __init spia_init (void) +{ + struct nand_chip *this; + + /* Allocate memory for MTD device structure and private data */ + spia_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip), + GFP_KERNEL); + if (!spia_mtd) { + printk ("Unable to allocate SPIA NAND MTD device structure.\n"); + return -ENOMEM; + } + + /* Get pointer to private data */ + this = (struct nand_chip *) (&spia_mtd[1]); + + /* Initialize structures */ + memset((char *) spia_mtd, 0, sizeof(struct mtd_info)); + memset((char *) this, 0, sizeof(struct nand_chip)); + + /* Link the private data with the MTD structure */ + spia_mtd->priv = this; + + /* + * Set GPIO Port E control register so that the pins are configured + * to be outputs for controlling the NAND flash. + */ + (*(volatile unsigned char *) (spia_io_base + spia_peddr)) = 0x07; + + /* Set address of NAND IO lines */ + this->IO_ADDR_R = (void __iomem *) spia_fio_base; + this->IO_ADDR_W = (void __iomem *) spia_fio_base; + /* Set address of hardware control function */ + this->hwcontrol = spia_hwcontrol; + /* 15 us command delay time */ + this->chip_delay = 15; + + /* Scan to find existence of the device */ + if (nand_scan (spia_mtd, 1)) { + kfree (spia_mtd); + return -ENXIO; + } + + /* Register the partitions */ + add_mtd_partitions(spia_mtd, partition_info, NUM_PARTITIONS); + + /* Return happy */ + return 0; +} +module_init(spia_init); + +/* + * Clean up routine + */ +#ifdef MODULE +static void __exit spia_cleanup (void) +{ + /* Release resources, unregister device */ + nand_release (spia_mtd); + + /* Free the MTD device structure */ + kfree (spia_mtd); +} +module_exit(spia_cleanup); +#endif + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com"); +MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board"); |