/* * 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; } /* * Main initialization routine */ static int __init ep7312_init(void) { struct nand_chip *this; 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"; /* Register the partitions */ mtd_device_register(ep7312_mtd, NULL, 0, partition_info, NUM_PARTITIONS); /* 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");