blob: 0cc6d0acb8febdcde011545e5022bb950e3ccf0e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/mtd/nand/spia.c
3 *
4 * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
5 *
6 *
7 * 10-29-2001 TG change to support hardwarespecific access
8 * to controllines (due to change in nand.c)
9 * page_cache added
10 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 * Overview:
16 * This is a device driver for the NAND flash device found on the
17 * SPIA board which utilizes the Toshiba TC58V64AFT part. This is
18 * a 64Mibit (8MiB x 8 bits) NAND flash device.
19 */
20
21#include <linux/kernel.h>
22#include <linux/init.h>
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>
28#include <asm/io.h>
29
30/*
31 * MTD structure for SPIA board
32 */
33static struct mtd_info *spia_mtd = NULL;
34
35/*
36 * Values specific to the SPIA board (used with EP7212 processor)
37 */
38#define SPIA_IO_BASE 0xd0000000 /* Start of EP7212 IO address space */
39#define SPIA_FIO_BASE 0xf0000000 /* Address where flash is mapped */
David Woodhousee0c7d762006-05-13 18:07:53 +010040#define SPIA_PEDR 0x0080 /*
41 * IO offset to Port E data register
42 * where the CLE, ALE and NCE pins
43 * are wired to.
44 */
45#define SPIA_PEDDR 0x00c0 /*
46 * IO offset to Port E data direction
47 * register so we can control the IO
48 * lines.
49 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51/*
52 * Module stuff
53 */
54
55static int spia_io_base = SPIA_IO_BASE;
56static int spia_fio_base = SPIA_FIO_BASE;
57static int spia_pedr = SPIA_PEDR;
58static int spia_peddr = SPIA_PEDDR;
59
60module_param(spia_io_base, int, 0);
61module_param(spia_fio_base, int, 0);
62module_param(spia_pedr, int, 0);
63module_param(spia_peddr, int, 0);
64
65/*
66 * Define partitions for flash device
67 */
Jesper Juhl3c6bee12006-01-09 20:54:01 -080068static const struct mtd_partition partition_info[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 {
David Woodhousee0c7d762006-05-13 18:07:53 +010070 .name = "SPIA flash partition 1",
71 .offset = 0,
72 .size = 2 * 1024 * 1024},
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 {
David Woodhousee0c7d762006-05-13 18:07:53 +010074 .name = "SPIA flash partition 2",
75 .offset = 2 * 1024 * 1024,
76 .size = 6 * 1024 * 1024}
Linus Torvalds1da177e2005-04-16 15:20:36 -070077};
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
David Woodhousee0c7d762006-05-13 18:07:53 +010079#define NUM_PARTITIONS 2
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Thomas Gleixner61b03bd2005-11-07 11:15:49 +000081/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 * hardware specific access to control-lines
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020083 *
84 * ctrl:
85 * NAND_CNE: bit 0 -> bit 2
86 * NAND_CLE: bit 1 -> bit 0
87 * NAND_ALE: bit 2 -> bit 1
88 */
David Woodhousee0c7d762006-05-13 18:07:53 +010089static void spia_hwcontrol(struct mtd_info *mtd, int cmd)
90{
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020091 struct nand_chip *chip = mtd->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020093 if (ctrl & NAND_CTRL_CHANGE) {
94 void __iomem *addr = spia_io_base + spia_pedr;
95 unsigned char bits;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020097 bits = (ctrl & NAND_CNE) << 2;
98 bits |= (ctrl & NAND_CLE | NAND_ALE) >> 1;
99 writeb((readb(addr) & ~0x7) | bits, addr);
David Woodhousee0c7d762006-05-13 18:07:53 +0100100 }
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +0200101
102 if (cmd != NAND_CMD_NONE)
103 writeb(cmd, chip->IO_ADDR_W);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
106/*
107 * Main initialization routine
108 */
David Woodhousecead4db2006-05-16 13:54:50 +0100109static int __init spia_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
111 struct nand_chip *this;
112
113 /* Allocate memory for MTD device structure and private data */
David Woodhousee0c7d762006-05-13 18:07:53 +0100114 spia_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 if (!spia_mtd) {
David Woodhousee0c7d762006-05-13 18:07:53 +0100116 printk("Unable to allocate SPIA NAND MTD device structure.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 return -ENOMEM;
118 }
119
120 /* Get pointer to private data */
David Woodhousee0c7d762006-05-13 18:07:53 +0100121 this = (struct nand_chip *)(&spia_mtd[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123 /* Initialize structures */
David Woodhousee0c7d762006-05-13 18:07:53 +0100124 memset(spia_mtd, 0, sizeof(struct mtd_info));
125 memset(this, 0, sizeof(struct nand_chip));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
127 /* Link the private data with the MTD structure */
128 spia_mtd->priv = this;
David Woodhouse552d9202006-05-14 01:20:46 +0100129 spia_mtd->owner = THIS_MODULE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131 /*
132 * Set GPIO Port E control register so that the pins are configured
133 * to be outputs for controlling the NAND flash.
134 */
David Woodhousee0c7d762006-05-13 18:07:53 +0100135 (*(volatile unsigned char *)(spia_io_base + spia_peddr)) = 0x07;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 /* Set address of NAND IO lines */
David Woodhousee0c7d762006-05-13 18:07:53 +0100138 this->IO_ADDR_R = (void __iomem *)spia_fio_base;
139 this->IO_ADDR_W = (void __iomem *)spia_fio_base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 /* Set address of hardware control function */
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +0200141 this->cmd_ctrl = spia_hwcontrol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 /* 15 us command delay time */
Thomas Gleixner61b03bd2005-11-07 11:15:49 +0000143 this->chip_delay = 15;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145 /* Scan to find existence of the device */
David Woodhousee0c7d762006-05-13 18:07:53 +0100146 if (nand_scan(spia_mtd, 1)) {
147 kfree(spia_mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 return -ENXIO;
149 }
150
151 /* Register the partitions */
152 add_mtd_partitions(spia_mtd, partition_info, NUM_PARTITIONS);
153
154 /* Return happy */
155 return 0;
156}
David Woodhousee0c7d762006-05-13 18:07:53 +0100157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158module_init(spia_init);
159
160/*
161 * Clean up routine
162 */
David Woodhousee0c7d762006-05-13 18:07:53 +0100163static void __exit spia_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 /* Release resources, unregister device */
David Woodhousee0c7d762006-05-13 18:07:53 +0100166 nand_release(spia_mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168 /* Free the MTD device structure */
David Woodhousee0c7d762006-05-13 18:07:53 +0100169 kfree(spia_mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
David Woodhousee0c7d762006-05-13 18:07:53 +0100171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172module_exit(spia_cleanup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174MODULE_LICENSE("GPL");
175MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com");
176MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");