patch-2.4.6 linux/drivers/mtd/nand/spia.c

• Lines: 161
• Date: Tue Jul 3 12:15:40 2001
• Orig file: v2.4.5/linux/drivers/mtd/nand/spia.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/nand/spia.c linux/drivers/mtd/nand/spia.c
@@ -0,0 +1,160 @@
+/*
+ *  drivers/mtd/spia.c
+ *
+ *  Copyright (C) 2000 Steven J. Hill (sjhill@cotw.com)
+ *
+ * $Id: spia.c,v 1.11 2001/07/03 17:50:56 sjhill 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
+ */
+#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
+  #define spia_init init_module
+  #define spia_cleanup cleanup_module
+#endif
+
+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 existance 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