1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
218 lines
5.3 KiB
C
218 lines
5.3 KiB
C
/*
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* drivers/mtd/nand/edb7312.c
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*
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* Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
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*
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* Derived from drivers/mtd/nand/autcpu12.c
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* Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
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*
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* $Id: edb7312.c,v 1.11 2004/11/04 12:53:10 gleixner Exp $
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Overview:
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* This is a device driver for the NAND flash device found on the
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* CLEP7312 board which utilizes the Toshiba TC58V64AFT part. This is
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* a 64Mibit (8MiB x 8 bits) NAND flash device.
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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#include <asm/arch/hardware.h> /* for CLPS7111_VIRT_BASE */
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#include <asm/sizes.h>
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#include <asm/hardware/clps7111.h>
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/*
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* MTD structure for EDB7312 board
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*/
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static struct mtd_info *ep7312_mtd = NULL;
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/*
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* Values specific to the EDB7312 board (used with EP7312 processor)
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*/
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#define EP7312_FIO_PBASE 0x10000000 /* Phys address of flash */
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#define EP7312_PXDR 0x0001 /*
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* IO offset to Port B data register
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* where the CLE, ALE and NCE pins
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* are wired to.
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*/
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#define EP7312_PXDDR 0x0041 /*
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* IO offset to Port B data direction
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* register so we can control the IO
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* lines.
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*/
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/*
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* Module stuff
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*/
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static unsigned long ep7312_fio_pbase = EP7312_FIO_PBASE;
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static void __iomem * ep7312_pxdr = (void __iomem *) EP7312_PXDR;
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static void __iomem * ep7312_pxddr = (void __iomem *) EP7312_PXDDR;
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#ifdef CONFIG_MTD_PARTITIONS
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/*
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* Define static partitions for flash device
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*/
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static struct mtd_partition partition_info[] = {
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{ .name = "EP7312 Nand Flash",
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.offset = 0,
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.size = 8*1024*1024 }
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};
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#define NUM_PARTITIONS 1
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#endif
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/*
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* hardware specific access to control-lines
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*/
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static void ep7312_hwcontrol(struct mtd_info *mtd, int cmd)
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{
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switch(cmd) {
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case NAND_CTL_SETCLE:
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clps_writeb(clps_readb(ep7312_pxdr) | 0x10, ep7312_pxdr);
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break;
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case NAND_CTL_CLRCLE:
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clps_writeb(clps_readb(ep7312_pxdr) & ~0x10, ep7312_pxdr);
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break;
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case NAND_CTL_SETALE:
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clps_writeb(clps_readb(ep7312_pxdr) | 0x20, ep7312_pxdr);
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break;
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case NAND_CTL_CLRALE:
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clps_writeb(clps_readb(ep7312_pxdr) & ~0x20, ep7312_pxdr);
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break;
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case NAND_CTL_SETNCE:
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clps_writeb((clps_readb(ep7312_pxdr) | 0x80) & ~0x40, ep7312_pxdr);
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break;
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case NAND_CTL_CLRNCE:
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clps_writeb((clps_readb(ep7312_pxdr) | 0x80) | 0x40, ep7312_pxdr);
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break;
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}
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}
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/*
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* read device ready pin
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*/
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static int ep7312_device_ready(struct mtd_info *mtd)
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{
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return 1;
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}
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#ifdef CONFIG_MTD_PARTITIONS
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const char *part_probes[] = { "cmdlinepart", NULL };
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#endif
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/*
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* Main initialization routine
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*/
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static int __init ep7312_init (void)
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{
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struct nand_chip *this;
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const char *part_type = 0;
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int mtd_parts_nb = 0;
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struct mtd_partition *mtd_parts = 0;
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void __iomem * ep7312_fio_base;
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/* Allocate memory for MTD device structure and private data */
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ep7312_mtd = kmalloc(sizeof(struct mtd_info) +
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sizeof(struct nand_chip),
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GFP_KERNEL);
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if (!ep7312_mtd) {
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printk("Unable to allocate EDB7312 NAND MTD device structure.\n");
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return -ENOMEM;
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}
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/* map physical adress */
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ep7312_fio_base = ioremap(ep7312_fio_pbase, SZ_1K);
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if(!ep7312_fio_base) {
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printk("ioremap EDB7312 NAND flash failed\n");
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kfree(ep7312_mtd);
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return -EIO;
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}
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/* Get pointer to private data */
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this = (struct nand_chip *) (&ep7312_mtd[1]);
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/* Initialize structures */
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memset((char *) ep7312_mtd, 0, sizeof(struct mtd_info));
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memset((char *) this, 0, sizeof(struct nand_chip));
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/* Link the private data with the MTD structure */
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ep7312_mtd->priv = this;
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/*
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* Set GPIO Port B control register so that the pins are configured
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* to be outputs for controlling the NAND flash.
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*/
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clps_writeb(0xf0, ep7312_pxddr);
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/* insert callbacks */
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this->IO_ADDR_R = ep7312_fio_base;
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this->IO_ADDR_W = ep7312_fio_base;
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this->hwcontrol = ep7312_hwcontrol;
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this->dev_ready = ep7312_device_ready;
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/* 15 us command delay time */
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this->chip_delay = 15;
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/* Scan to find existence of the device */
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if (nand_scan (ep7312_mtd, 1)) {
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iounmap((void *)ep7312_fio_base);
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kfree (ep7312_mtd);
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return -ENXIO;
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}
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#ifdef CONFIG_MTD_PARTITIONS
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ep7312_mtd->name = "edb7312-nand";
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mtd_parts_nb = parse_mtd_partitions(ep7312_mtd, part_probes,
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&mtd_parts, 0);
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if (mtd_parts_nb > 0)
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part_type = "command line";
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else
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mtd_parts_nb = 0;
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#endif
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if (mtd_parts_nb == 0) {
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mtd_parts = partition_info;
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mtd_parts_nb = NUM_PARTITIONS;
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part_type = "static";
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}
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/* Register the partitions */
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printk(KERN_NOTICE "Using %s partition definition\n", part_type);
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add_mtd_partitions(ep7312_mtd, mtd_parts, mtd_parts_nb);
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/* Return happy */
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return 0;
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}
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module_init(ep7312_init);
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/*
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* Clean up routine
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*/
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static void __exit ep7312_cleanup (void)
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{
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struct nand_chip *this = (struct nand_chip *) &ep7312_mtd[1];
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/* Release resources, unregister device */
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nand_release (ap7312_mtd);
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/* Free internal data buffer */
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kfree (this->data_buf);
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/* Free the MTD device structure */
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kfree (ep7312_mtd);
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}
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module_exit(ep7312_cleanup);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
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MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");
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