/* * 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) * * $Id: edb7312.c,v 1.3 2002/06/06 12:58:16 mag 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 * CLEP7312 board which utilizes the Toshiba TC58V64AFT part. This is * a 64Mibit (8MiB x 8 bits) NAND flash device. */ #include #include #include #include #include #include #include /* for CLPS7111_VIRT_BASE */ #include #include /* * 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 int ep7312_fio_pbase = EP7312_FIO_PBASE; static int ep7312_pxdr = EP7312_PXDR; static int ep7312_pxddr = EP7312_PXDDR; #ifdef MODULE MODULE_PARM(ep7312_fio_pbase, "i"); MODULE_PARM(ep7312_pxdr, "i"); MODULE_PARM(ep7312_pxddr, "i"); __setup("ep7312_fio_pbase=",ep7312_fio_pbase); __setup("ep7312_pxdr=",ep7312_pxdr); __setup("ep7312_pxddr=",ep7312_pxddr); #endif #ifdef CONFIG_MTD_PARTITIONS /* * 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 extern int parse_cmdline_partitions(struct mtd_info *master, struct mtd_partition **pparts, const char *mtd_id); #endif /* * hardware specific access to control-lines */ static void ep7312_hwcontrol(int cmd) { switch(cmd) { case NAND_CTL_SETCLE: clps_writeb(clps_readb(ep7312_pxdr) | 0x10, ep7312_pxdr); break; case NAND_CTL_CLRCLE: clps_writeb(clps_readb(ep7312_pxdr) & ~0x10, ep7312_pxdr); break; case NAND_CTL_SETALE: clps_writeb(clps_readb(ep7312_pxdr) | 0x20, ep7312_pxdr); break; case NAND_CTL_CLRALE: clps_writeb(clps_readb(ep7312_pxdr) & ~0x20, ep7312_pxdr); break; case NAND_CTL_SETNCE: clps_writeb((clps_readb(ep7312_pxdr) | 0x80) & ~0x40, ep7312_pxdr); break; case NAND_CTL_CLRNCE: clps_writeb((clps_readb(ep7312_pxdr) | 0x80) | 0x40, ep7312_pxdr); break; } } /* * read device ready pin */ static int ep7312_device_ready(void) { return 1; } /* * 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; int 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 adress */ ep7312_fio_base = (unsigned long)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((char *) ep7312_mtd, 0, sizeof(struct mtd_info)); memset((char *) this, 0, sizeof(struct nand_chip)); /* Link the private data with the MTD structure */ ep7312_mtd->priv = this; /* * 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->hwcontrol = 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)) { iounmap((void *)ep7312_fio_base); kfree (ep7312_mtd); return -ENXIO; } /* Allocate memory for internal data buffer */ this->data_buf = kmalloc (sizeof(u_char) * (ep7312_mtd->oobblock + ep7312_mtd->oobsize), GFP_KERNEL); if (!this->data_buf) { printk("Unable to allocate NAND data buffer for EDB7312.\n"); iounmap((void *)ep7312_fio_base); kfree (ep7312_mtd); return -ENOMEM; } /* Allocate memory for internal data buffer */ this->data_cache = kmalloc (sizeof(u_char) * (ep7312_mtd->oobblock + ep7312_mtd->oobsize), GFP_KERNEL); if (!this->data_cache) { printk("Unable to allocate NAND data cache for EDB7312.\n"); kfree (this->data_buf); iounmap((void *)ep7312_fio_base); kfree (ep7312_mtd); return -ENOMEM; } this->cache_page = -1; #ifdef CONFIG_MTD_CMDLINE_PARTS mtd_parts_nb = parse_cmdline_partitions(ep7312_mtd, &mtd_parts, "edb7312-nand"); if (mtd_parts_nb > 0) part_type = "command line"; else mtd_parts_nb = 0; #endif 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); add_mtd_partitions(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]; /* Unregister the device */ del_mtd_device (ep7312_mtd); /* Free internal data buffer */ kfree (this->data_buf); kfree (this->data_cache); /* Free the MTD device structure */ kfree (ep7312_mtd); } module_exit(ep7312_cleanup); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Marius Groeger "); MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");