diff options
Diffstat (limited to 'drivers/mtd/nand/edb7312.c')
| -rw-r--r-- | drivers/mtd/nand/edb7312.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/drivers/mtd/nand/edb7312.c b/drivers/mtd/nand/edb7312.c new file mode 100644 index 00000000..8400d0f6 --- /dev/null +++ b/drivers/mtd/nand/edb7312.c @@ -0,0 +1,203 @@ +/* + * drivers/mtd/nand/edb7312.c + * + * Copyright (C) 2002 Marius Gröger (mag@sysgo.de) + * + * Derived from drivers/mtd/nand/autcpu12.c + * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de) + * + * 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 + * CLEP7312 board which utilizes the Toshiba TC58V64AFT part. This is + * a 64Mibit (8MiB x 8 bits) NAND flash device. + */ + +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> +#include <asm/io.h> +#include <mach/hardware.h> /* for CLPS7111_VIRT_BASE */ +#include <asm/sizes.h> +#include <asm/hardware/clps7111.h> + +/* + * MTD structure for EDB7312 board + */ +static struct mtd_info *ep7312_mtd = NULL; + +/* + * Values specific to the EDB7312 board (used with EP7312 processor) + */ +#define EP7312_FIO_PBASE 0x10000000 /* Phys address of flash */ +#define EP7312_PXDR 0x0001 /* + * IO offset to Port B data register + * where the CLE, ALE and NCE pins + * are wired to. + */ +#define EP7312_PXDDR 0x0041 /* + * IO offset to Port B data direction + * register so we can control the IO + * lines. + */ + +/* + * Module stuff + */ + +static unsigned long ep7312_fio_pbase = EP7312_FIO_PBASE; +static void __iomem *ep7312_pxdr = (void __iomem *)EP7312_PXDR; +static void __iomem *ep7312_pxddr = (void __iomem *)EP7312_PXDDR; + +/* + * Define static partitions for flash device + */ +static struct mtd_partition partition_info[] = { + {.name = "EP7312 Nand Flash", + .offset = 0, + .size = 8 * 1024 * 1024} +}; + +#define NUM_PARTITIONS 1 + +/* + * hardware specific access to control-lines + * + * NAND_NCE: bit 0 -> bit 6 (bit 7 = 1) + * NAND_CLE: bit 1 -> bit 4 + * NAND_ALE: bit 2 -> bit 5 + */ +static void ep7312_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) +{ + struct nand_chip *chip = mtd->priv; + + if (ctrl & NAND_CTRL_CHANGE) { + unsigned char bits = 0x80; + + bits |= (ctrl & (NAND_CLE | NAND_ALE)) << 3; + bits |= (ctrl & NAND_NCE) ? 0x00 : 0x40; + + clps_writeb((clps_readb(ep7312_pxdr) & 0xF0) | bits, + ep7312_pxdr); + } + if (cmd != NAND_CMD_NONE) + writeb(cmd, chip->IO_ADDR_W); +} + +/* + * read device ready pin + */ +static int ep7312_device_ready(struct mtd_info *mtd) +{ + return 1; +} + +const char *part_probes[] = { "cmdlinepart", NULL }; + +/* + * Main initialization routine + */ +static int __init ep7312_init(void) +{ + struct nand_chip *this; + const char *part_type = 0; + int mtd_parts_nb = 0; + struct mtd_partition *mtd_parts = 0; + void __iomem *ep7312_fio_base; + + /* Allocate memory for MTD device structure and private data */ + ep7312_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL); + if (!ep7312_mtd) { + printk("Unable to allocate EDB7312 NAND MTD device structure.\n"); + return -ENOMEM; + } + + /* map physical address */ + ep7312_fio_base = ioremap(ep7312_fio_pbase, SZ_1K); + if (!ep7312_fio_base) { + printk("ioremap EDB7312 NAND flash failed\n"); + kfree(ep7312_mtd); + return -EIO; + } + + /* Get pointer to private data */ + this = (struct nand_chip *)(&ep7312_mtd[1]); + + /* Initialize structures */ + memset(ep7312_mtd, 0, sizeof(struct mtd_info)); + memset(this, 0, sizeof(struct nand_chip)); + + /* Link the private data with the MTD structure */ + ep7312_mtd->priv = this; + ep7312_mtd->owner = THIS_MODULE; + + /* + * Set GPIO Port B control register so that the pins are configured + * to be outputs for controlling the NAND flash. + */ + clps_writeb(0xf0, ep7312_pxddr); + + /* insert callbacks */ + this->IO_ADDR_R = ep7312_fio_base; + this->IO_ADDR_W = ep7312_fio_base; + this->cmd_ctrl = ep7312_hwcontrol; + this->dev_ready = ep7312_device_ready; + /* 15 us command delay time */ + this->chip_delay = 15; + + /* Scan to find existence of the device */ + if (nand_scan(ep7312_mtd, 1)) { + iounmap((void *)ep7312_fio_base); + kfree(ep7312_mtd); + return -ENXIO; + } + ep7312_mtd->name = "edb7312-nand"; + mtd_parts_nb = parse_mtd_partitions(ep7312_mtd, part_probes, &mtd_parts, 0); + if (mtd_parts_nb > 0) + part_type = "command line"; + else + mtd_parts_nb = 0; + if (mtd_parts_nb == 0) { + mtd_parts = partition_info; + mtd_parts_nb = NUM_PARTITIONS; + part_type = "static"; + } + + /* Register the partitions */ + printk(KERN_NOTICE "Using %s partition definition\n", part_type); + mtd_device_register(ep7312_mtd, mtd_parts, mtd_parts_nb); + + /* Return happy */ + return 0; +} + +module_init(ep7312_init); + +/* + * Clean up routine + */ +static void __exit ep7312_cleanup(void) +{ + struct nand_chip *this = (struct nand_chip *)&ep7312_mtd[1]; + + /* Release resources, unregister device */ + nand_release(ap7312_mtd); + + /* Release io resource */ + iounmap(this->IO_ADDR_R); + + /* Free the MTD device structure */ + kfree(ep7312_mtd); +} + +module_exit(ep7312_cleanup); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>"); +MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board"); |