diff options
Diffstat (limited to 'drivers/mtd/nand/autcpu12.c')
| -rw-r--r-- | drivers/mtd/nand/autcpu12.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/drivers/mtd/nand/autcpu12.c b/drivers/mtd/nand/autcpu12.c new file mode 100644 index 0000000..4afa8ce --- /dev/null +++ b/drivers/mtd/nand/autcpu12.c @@ -0,0 +1,225 @@ +/* + * drivers/mtd/autcpu12.c + * + * Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de> + * + * Derived from drivers/mtd/spia.c + * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com) + * + * $Id: autcpu12.c,v 1.22 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 + * autronix autcpu12 board, which is a SmartMediaCard. It supports + * 16MiB, 32MiB and 64MiB cards. + * + * + * 02-12-2002 TG Cleanup of module params + * + * 02-20-2002 TG adjusted for different rd/wr adress support + * added support for read device ready/busy line + * added page_cache + * + * 10-06-2002 TG 128K card support added + */ + +#include <linux/version.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> +#include <asm/io.h> +#include <asm/arch/hardware.h> +#include <asm/sizes.h> +#include <asm/arch/autcpu12.h> + +/* + * MTD structure for AUTCPU12 board + */ +static struct mtd_info *autcpu12_mtd = NULL; + +static int autcpu12_io_base = CS89712_VIRT_BASE; +static int autcpu12_fio_pbase = AUTCPU12_PHYS_SMC; +static int autcpu12_fio_ctrl = AUTCPU12_SMC_SELECT_OFFSET; +static int autcpu12_pedr = AUTCPU12_SMC_PORT_OFFSET; +static void __iomem * autcpu12_fio_base; + +/* + * Define partitions for flash devices + */ +static struct mtd_partition partition_info16k[] = { + { .name = "AUTCPU12 flash partition 1", + .offset = 0, + .size = 8 * SZ_1M }, + { .name = "AUTCPU12 flash partition 2", + .offset = 8 * SZ_1M, + .size = 8 * SZ_1M }, +}; + +static struct mtd_partition partition_info32k[] = { + { .name = "AUTCPU12 flash partition 1", + .offset = 0, + .size = 8 * SZ_1M }, + { .name = "AUTCPU12 flash partition 2", + .offset = 8 * SZ_1M, + .size = 24 * SZ_1M }, +}; + +static struct mtd_partition partition_info64k[] = { + { .name = "AUTCPU12 flash partition 1", + .offset = 0, + .size = 16 * SZ_1M }, + { .name = "AUTCPU12 flash partition 2", + .offset = 16 * SZ_1M, + .size = 48 * SZ_1M }, +}; + +static struct mtd_partition partition_info128k[] = { + { .name = "AUTCPU12 flash partition 1", + .offset = 0, + .size = 16 * SZ_1M }, + { .name = "AUTCPU12 flash partition 2", + .offset = 16 * SZ_1M, + .size = 112 * SZ_1M }, +}; + +#define NUM_PARTITIONS16K 2 +#define NUM_PARTITIONS32K 2 +#define NUM_PARTITIONS64K 2 +#define NUM_PARTITIONS128K 2 +/* + * hardware specific access to control-lines +*/ +static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd) +{ + + switch(cmd){ + + case NAND_CTL_SETCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |= AUTCPU12_SMC_CLE; break; + case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_CLE; break; + + case NAND_CTL_SETALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |= AUTCPU12_SMC_ALE; break; + case NAND_CTL_CLRALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_ALE; break; + + case NAND_CTL_SETNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x01; break; + case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x00; break; + } +} + +/* +* read device ready pin +*/ +int autcpu12_device_ready(struct mtd_info *mtd) +{ + + return ( (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) & AUTCPU12_SMC_RDY) ? 1 : 0; + +} + +/* + * Main initialization routine + */ +int __init autcpu12_init (void) +{ + struct nand_chip *this; + int err = 0; + + /* Allocate memory for MTD device structure and private data */ + autcpu12_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip), + GFP_KERNEL); + if (!autcpu12_mtd) { + printk ("Unable to allocate AUTCPU12 NAND MTD device structure.\n"); + err = -ENOMEM; + goto out; + } + + /* map physical adress */ + autcpu12_fio_base = ioremap(autcpu12_fio_pbase,SZ_1K); + if(!autcpu12_fio_base){ + printk("Ioremap autcpu12 SmartMedia Card failed\n"); + err = -EIO; + goto out_mtd; + } + + /* Get pointer to private data */ + this = (struct nand_chip *) (&autcpu12_mtd[1]); + + /* Initialize structures */ + memset((char *) autcpu12_mtd, 0, sizeof(struct mtd_info)); + memset((char *) this, 0, sizeof(struct nand_chip)); + + /* Link the private data with the MTD structure */ + autcpu12_mtd->priv = this; + + /* Set address of NAND IO lines */ + this->IO_ADDR_R = autcpu12_fio_base; + this->IO_ADDR_W = autcpu12_fio_base; + this->hwcontrol = autcpu12_hwcontrol; + this->dev_ready = autcpu12_device_ready; + /* 20 us command delay time */ + this->chip_delay = 20; + this->eccmode = NAND_ECC_SOFT; + + /* Enable the following for a flash based bad block table */ + /* + this->options = NAND_USE_FLASH_BBT; + */ + this->options = NAND_USE_FLASH_BBT; + + /* Scan to find existance of the device */ + if (nand_scan (autcpu12_mtd, 1)) { + err = -ENXIO; + goto out_ior; + } + + /* Register the partitions */ + switch(autcpu12_mtd->size){ + case SZ_16M: add_mtd_partitions(autcpu12_mtd, partition_info16k, NUM_PARTITIONS16K); break; + case SZ_32M: add_mtd_partitions(autcpu12_mtd, partition_info32k, NUM_PARTITIONS32K); break; + case SZ_64M: add_mtd_partitions(autcpu12_mtd, partition_info64k, NUM_PARTITIONS64K); break; + case SZ_128M: add_mtd_partitions(autcpu12_mtd, partition_info128k, NUM_PARTITIONS128K); break; + default: { + printk ("Unsupported SmartMedia device\n"); + err = -ENXIO; + goto out_ior; + } + } + goto out; + +out_ior: + iounmap((void *)autcpu12_fio_base); +out_mtd: + kfree (autcpu12_mtd); +out: + return err; +} + +module_init(autcpu12_init); + +/* + * Clean up routine + */ +#ifdef MODULE +static void __exit autcpu12_cleanup (void) +{ + /* Release resources, unregister device */ + nand_release (autcpu12_mtd); + + /* unmap physical adress */ + iounmap((void *)autcpu12_fio_base); + + /* Free the MTD device structure */ + kfree (autcpu12_mtd); +} +module_exit(autcpu12_cleanup); +#endif + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>"); +MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12"); |