173 lines
4.5 KiB
C
173 lines
4.5 KiB
C
/*
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* drivers/mtd/nand/spia.c
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*
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* Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
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*
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*
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* 10-29-2001 TG change to support hardwarespecific access
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* to controllines (due to change in nand.c)
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* page_cache added
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*
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* $Id: spia.c,v 1.25 2005/11/07 11:14:31 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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* SPIA 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/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.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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/*
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* MTD structure for SPIA board
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*/
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static struct mtd_info *spia_mtd = NULL;
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/*
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* Values specific to the SPIA board (used with EP7212 processor)
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*/
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#define SPIA_IO_BASE 0xd0000000 /* Start of EP7212 IO address space */
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#define SPIA_FIO_BASE 0xf0000000 /* Address where flash is mapped */
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#define SPIA_PEDR 0x0080 /*
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* IO offset to Port E 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 SPIA_PEDDR 0x00c0 /*
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* IO offset to Port E 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 int spia_io_base = SPIA_IO_BASE;
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static int spia_fio_base = SPIA_FIO_BASE;
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static int spia_pedr = SPIA_PEDR;
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static int spia_peddr = SPIA_PEDDR;
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module_param(spia_io_base, int, 0);
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module_param(spia_fio_base, int, 0);
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module_param(spia_pedr, int, 0);
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module_param(spia_peddr, int, 0);
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/*
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* Define partitions for flash device
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*/
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const static struct mtd_partition partition_info[] = {
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{
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.name = "SPIA flash partition 1",
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.offset = 0,
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.size = 2*1024*1024
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},
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{
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.name = "SPIA flash partition 2",
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.offset = 2*1024*1024,
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.size = 6*1024*1024
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}
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};
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#define NUM_PARTITIONS 2
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/*
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* hardware specific access to control-lines
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*/
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static void spia_hwcontrol(struct mtd_info *mtd, int cmd){
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switch(cmd){
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case NAND_CTL_SETCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x01; break;
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case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x01; break;
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case NAND_CTL_SETALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x02; break;
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case NAND_CTL_CLRALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x02; break;
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case NAND_CTL_SETNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x04; break;
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case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x04; break;
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}
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}
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/*
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* Main initialization routine
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*/
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int __init spia_init (void)
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{
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struct nand_chip *this;
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/* Allocate memory for MTD device structure and private data */
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spia_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
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GFP_KERNEL);
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if (!spia_mtd) {
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printk ("Unable to allocate SPIA NAND MTD device structure.\n");
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return -ENOMEM;
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}
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/* Get pointer to private data */
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this = (struct nand_chip *) (&spia_mtd[1]);
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/* Initialize structures */
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memset((char *) spia_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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spia_mtd->priv = this;
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/*
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* Set GPIO Port E 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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(*(volatile unsigned char *) (spia_io_base + spia_peddr)) = 0x07;
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/* Set address of NAND IO lines */
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this->IO_ADDR_R = (void __iomem *) spia_fio_base;
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this->IO_ADDR_W = (void __iomem *) spia_fio_base;
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/* Set address of hardware control function */
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this->hwcontrol = spia_hwcontrol;
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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 (spia_mtd, 1)) {
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kfree (spia_mtd);
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return -ENXIO;
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}
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/* Register the partitions */
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add_mtd_partitions(spia_mtd, partition_info, NUM_PARTITIONS);
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/* Return happy */
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return 0;
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}
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module_init(spia_init);
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/*
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* Clean up routine
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*/
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#ifdef MODULE
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static void __exit spia_cleanup (void)
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{
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/* Release resources, unregister device */
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nand_release (spia_mtd);
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/* Free the MTD device structure */
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kfree (spia_mtd);
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}
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module_exit(spia_cleanup);
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#endif
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com");
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MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");
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