1 /*
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 *
11 * 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 */
33 static 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 */
40 #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 */
50
51 /*
52 * Module stuff
53 */
54
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;
59
60 module_param(spia_io_base, int, 0);
61 module_param(spia_fio_base, int, 0);
62 module_param(spia_pedr, int, 0);
63 module_param(spia_peddr, int, 0);
64
65 /*
66 * Define partitions for flash device
67 */
68 static const struct mtd_partition partition_info[] = {
69 {
70 .name = "SPIA flash partition 1",
71 .offset = 0,
72 .size = 2 * 1024 * 1024},
73 {
74 .name = "SPIA flash partition 2",
75 .offset = 2 * 1024 * 1024,
76 .size = 6 * 1024 * 1024}
77 };
78
79 #define NUM_PARTITIONS 2
80
81 /*
82 * hardware specific access to control-lines
83 *
84 * ctrl:
85 * NAND_CNE: bit 0 -> bit 2
86 * NAND_CLE: bit 1 -> bit 0
87 * NAND_ALE: bit 2 -> bit 1
88 */
spia_hwcontrol(struct mtd_info * mtd,int cmd)89 static void spia_hwcontrol(struct mtd_info *mtd, int cmd)
90 {
91 struct nand_chip *chip = mtd->priv;
92
93 if (ctrl & NAND_CTRL_CHANGE) {
94 void __iomem *addr = spia_io_base + spia_pedr;
95 unsigned char bits;
96
97 bits = (ctrl & NAND_CNE) << 2;
98 bits |= (ctrl & NAND_CLE | NAND_ALE) >> 1;
99 writeb((readb(addr) & ~0x7) | bits, addr);
100 }
101
102 if (cmd != NAND_CMD_NONE)
103 writeb(cmd, chip->IO_ADDR_W);
104 }
105
106 /*
107 * Main initialization routine
108 */
spia_init(void)109 static int __init spia_init(void)
110 {
111 struct nand_chip *this;
112
113 /* Allocate memory for MTD device structure and private data */
114 spia_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
115 if (!spia_mtd) {
116 printk("Unable to allocate SPIA NAND MTD device structure.\n");
117 return -ENOMEM;
118 }
119
120 /* Get pointer to private data */
121 this = (struct nand_chip *)(&spia_mtd[1]);
122
123 /* Initialize structures */
124 memset(spia_mtd, 0, sizeof(struct mtd_info));
125 memset(this, 0, sizeof(struct nand_chip));
126
127 /* Link the private data with the MTD structure */
128 spia_mtd->priv = this;
129 spia_mtd->owner = THIS_MODULE;
130
131 /*
132 * Set GPIO Port E control register so that the pins are configured
133 * to be outputs for controlling the NAND flash.
134 */
135 (*(volatile unsigned char *)(spia_io_base + spia_peddr)) = 0x07;
136
137 /* Set address of NAND IO lines */
138 this->IO_ADDR_R = (void __iomem *)spia_fio_base;
139 this->IO_ADDR_W = (void __iomem *)spia_fio_base;
140 /* Set address of hardware control function */
141 this->cmd_ctrl = spia_hwcontrol;
142 /* 15 us command delay time */
143 this->chip_delay = 15;
144
145 /* Scan to find existence of the device */
146 if (nand_scan(spia_mtd, 1)) {
147 kfree(spia_mtd);
148 return -ENXIO;
149 }
150
151 /* Register the partitions */
152 mtd_device_register(spia_mtd, partition_info, NUM_PARTITIONS);
153
154 /* Return happy */
155 return 0;
156 }
157
158 module_init(spia_init);
159
160 /*
161 * Clean up routine
162 */
spia_cleanup(void)163 static void __exit spia_cleanup(void)
164 {
165 /* Release resources, unregister device */
166 nand_release(spia_mtd);
167
168 /* Free the MTD device structure */
169 kfree(spia_mtd);
170 }
171
172 module_exit(spia_cleanup);
173
174 MODULE_LICENSE("GPL");
175 MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com");
176 MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");
177