spia.c
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:4k
- /*
- * drivers/mtd/nand/spia.c
- *
- * Copyright (C) 2000 Steven J. Hill (sjhill@cotw.com)
- *
- * $Id: spia.c,v 1.12 2001/10/02 15:05:14 dwmw2 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
- * SPIA 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/mtd/mtd.h>
- #include <linux/mtd/nand.h>
- #include <linux/mtd/partitions.h>
- #include <asm/io.h>
- /*
- * MTD structure for SPIA board
- */
- static struct mtd_info *spia_mtd = NULL;
- /*
- * Values specific to the SPIA board (used with EP7212 processor)
- */
- #define SPIA_IO_ADDR = 0xd0000000 /* Start of EP7212 IO address space */
- #define SPIA_FIO_ADDR = 0xf0000000 /* Address where flash is mapped */
- #define SPIA_PEDR = 0x0080 /*
- * IO offset to Port E data register
- * where the CLE, ALE and NCE pins
- * are wired to.
- */
- #define SPIA_PEDDR = 0x00c0 /*
- * IO offset to Port E data direction
- * register so we can control the IO
- * lines.
- */
- /*
- * Module stuff
- */
- static int spia_io_base = SPIA_IO_BASE;
- static int spia_fio_base = SPIA_FIO_BASE;
- static int spia_pedr = SPIA_PEDR;
- static int spia_peddr = SPIA_PEDDR;
- MODULE_PARM(spia_io_base, "i");
- MODULE_PARM(spia_fio_base, "i");
- MODULE_PARM(spia_pedr, "i");
- MODULE_PARM(spia_peddr, "i");
- __setup("spia_io_base=",spia_io_base);
- __setup("spia_fio_base=",spia_fio_base);
- __setup("spia_pedr=",spia_pedr);
- __setup("spia_peddr=",spia_peddr);
- /*
- * Define partitions for flash device
- */
- const static struct mtd_partition partition_info[] = {
- { name: "SPIA flash partition 1",
- offset: 0,
- size: 2*1024*1024 },
- { name: "SPIA flash partition 2",
- offset: 2*1024*1024,
- size: 6*1024*1024 }
- };
- #define NUM_PARTITIONS 2
- /*
- * Main initialization routine
- */
- int __init spia_init (void)
- {
- struct nand_chip *this;
- /* Allocate memory for MTD device structure and private data */
- spia_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
- GFP_KERNEL);
- if (!spia_mtd) {
- printk ("Unable to allocate SPIA NAND MTD device structure.n");
- return -ENOMEM;
- }
- /* Get pointer to private data */
- this = (struct nand_chip *) (&spia_mtd[1]);
- /* Initialize structures */
- memset((char *) spia_mtd, 0, sizeof(struct mtd_info));
- memset((char *) this, 0, sizeof(struct nand_chip));
- /* Link the private data with the MTD structure */
- spia_mtd->priv = this;
- /*
- * Set GPIO Port E control register so that the pins are configured
- * to be outputs for controlling the NAND flash.
- */
- (*(volatile unsigned char *) (spia_io_base + spia_peddr)) = 0x07;
- /* Set address of NAND IO lines */
- this->IO_ADDR = spia_fio_base;
- this->CTRL_ADDR = spia_io_base + spia_pedr;
- this->CLE = 0x01;
- this->ALE = 0x02;
- this->NCE = 0x04;
- /* Scan to find existence of the device */
- if (nand_scan (spia_mtd)) {
- kfree (spia_mtd);
- return -ENXIO;
- }
- /* Allocate memory for internal data buffer */
- this->data_buf = kmalloc (sizeof(u_char) * (spia_mtd->oobblock + spia_mtd->oobsize), GFP_KERNEL);
- if (!this->data_buf) {
- printk ("Unable to allocate NAND data buffer for SPIA.n");
- kfree (spia_mtd);
- return -ENOMEM;
- }
- /* Register the partitions */
- add_mtd_partitions(spia_mtd, partition_info, NUM_PARTITIONS);
- /* Return happy */
- return 0;
- }
- module_init(spia_init);
- /*
- * Clean up routine
- */
- #ifdef MODULE
- static void __exit spia_cleanup (void)
- {
- struct nand_chip *this = (struct nand_chip *) &spia_mtd[1];
- /* Unregister the device */
- del_mtd_device (spia_mtd);
- /* Free internal data buffer */
- kfree (this->data_buf);
- /* Free the MTD device structure */
- kfree (spia_mtd);
- }
- module_exit(spia_cleanup);
- #endif
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Steven J. Hill <sjhill@cotw.com");
- MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");