2 * drivers/mtd/nand/spia.c
4 * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
7 * 10-29-2001 TG change to support hardwarespecific access
8 * to controllines (due to change in nand.c)
11 * $Id: spia.c,v 1.19 2003/04/20 07:24:40 gleixner Exp $
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
18 * This is a device driver for the NAND flash device found on the
19 * SPIA board which utilizes the Toshiba TC58V64AFT part. This is
20 * a 64Mibit (8MiB x 8 bits) NAND flash device.
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/mtd/mtd.h>
26 #include <linux/mtd/nand.h>
27 #include <linux/mtd/partitions.h>
31 * MTD structure for SPIA board
33 static struct mtd_info *spia_mtd = NULL;
36 * Values specific to the SPIA board (used with EP7212 processor)
38 #define SPIA_IO_ADDR = 0xd0000000 /* Start of EP7212 IO address space */
39 #define SPIA_FIO_ADDR = 0xf0000000 /* Address where flash is mapped */
40 #define SPIA_PEDR = 0x0080 /*
41 * IO offset to Port E data register
42 * where the CLE, ALE and NCE pins
45 #define SPIA_PEDDR = 0x00c0 /*
46 * IO offset to Port E data direction
47 * register so we can control the IO
55 static int spia_io_base = SPIA_IO_BASE;
56 static int spia_fio_base = SPIA_FIO_BASE;
57 static int spia_pedr = SPIA_PEDR;
58 static int spia_peddr = SPIA_PEDDR;
60 MODULE_PARM(spia_io_base, "i");
61 MODULE_PARM(spia_fio_base, "i");
62 MODULE_PARM(spia_pedr, "i");
63 MODULE_PARM(spia_peddr, "i");
65 __setup("spia_io_base=",spia_io_base);
66 __setup("spia_fio_base=",spia_fio_base);
67 __setup("spia_pedr=",spia_pedr);
68 __setup("spia_peddr=",spia_peddr);
71 * Define partitions for flash device
73 const static struct mtd_partition partition_info[] = {
75 .name = "SPIA flash partition 1",
80 .name = "SPIA flash partition 2",
81 .offset = 2*1024*1024,
85 #define NUM_PARTITIONS 2
89 * hardware specific access to control-lines
91 void spia_hwcontrol(int cmd){
95 case NAND_CTL_SETCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x01; break;
96 case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x01; break;
98 case NAND_CTL_SETALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x02; break;
99 case NAND_CTL_CLRALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x02; break;
101 case NAND_CTL_SETNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x04; break;
102 case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x04; break;
107 * Main initialization routine
109 int __init spia_init (void)
111 struct nand_chip *this;
113 /* Allocate memory for MTD device structure and private data */
114 spia_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
117 printk ("Unable to allocate SPIA NAND MTD device structure.\n");
121 /* Get pointer to private data */
122 this = (struct nand_chip *) (&spia_mtd[1]);
124 /* Initialize structures */
125 memset((char *) spia_mtd, 0, sizeof(struct mtd_info));
126 memset((char *) this, 0, sizeof(struct nand_chip));
128 /* Link the private data with the MTD structure */
129 spia_mtd->priv = this;
132 * Set GPIO Port E control register so that the pins are configured
133 * to be outputs for controlling the NAND flash.
135 (*(volatile unsigned char *) (spia_io_base + spia_peddr)) = 0x07;
137 /* Set address of NAND IO lines */
138 this->IO_ADDR_R = spia_fio_base;
139 this->IO_ADDR_W = spia_fio_base;
140 /* Set address of hardware control function */
141 this->hwcontrol = spia_hwcontrol;
142 /* 15 us command delay time */
143 this->chip_delay = 15;
145 /* Scan to find existence of the device */
146 if (nand_scan (spia_mtd)) {
151 /* Allocate memory for internal data buffer */
152 this->data_buf = kmalloc (sizeof(u_char) * (spia_mtd->oobblock + spia_mtd->oobsize), GFP_KERNEL);
153 if (!this->data_buf) {
154 printk ("Unable to allocate NAND data buffer for SPIA.\n");
159 /* Register the partitions */
160 add_mtd_partitions(spia_mtd, partition_info, NUM_PARTITIONS);
165 module_init(spia_init);
171 static void __exit spia_cleanup (void)
173 struct nand_chip *this = (struct nand_chip *) &spia_mtd[1];
175 /* Unregister the device */
176 del_mtd_device (spia_mtd);
178 /* Free internal data buffer */
179 kfree (this->data_buf);
181 /* Free the MTD device structure */
184 module_exit(spia_cleanup);
187 MODULE_LICENSE("GPL");
188 MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com");
189 MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");