1 /*
2 * drivers/mtd/nand/h1910.c
3 *
4 * Copyright (C) 2003 Joshua Wise (joshua@joshuawise.com)
5 *
6 * Derived from drivers/mtd/nand/edb7312.c
7 * Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
8 * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * Overview:
15 * This is a device driver for the NAND flash device found on the
16 * iPAQ h1910 board which utilizes the Samsung K9F2808 part. This is
17 * a 128Mibit (16MiB x 8 bits) NAND flash device.
18 */
19
20 #include <linux/slab.h>
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/mtd/mtd.h>
24 #include <linux/mtd/nand.h>
25 #include <linux/mtd/partitions.h>
26 #include <asm/io.h>
27 #include <mach/hardware.h> /* for CLPS7111_VIRT_BASE */
28 #include <asm/sizes.h>
29 #include <mach/h1900-gpio.h>
30 #include <mach/ipaq.h>
31
32 /*
33 * MTD structure for EDB7312 board
34 */
35 static struct mtd_info *h1910_nand_mtd = NULL;
36
37 /*
38 * Module stuff
39 */
40
41 #ifdef CONFIG_MTD_PARTITIONS
42 /*
43 * Define static partitions for flash device
44 */
45 static struct mtd_partition partition_info[] = {
46 {name:"h1910 NAND Flash",
47 offset:0,
48 size:16 * 1024 * 1024}
49 };
50
51 #define NUM_PARTITIONS 1
52
53 #endif
54
55 /*
56 * hardware specific access to control-lines
57 *
58 * NAND_NCE: bit 0 - don't care
59 * NAND_CLE: bit 1 - address bit 2
60 * NAND_ALE: bit 2 - address bit 3
61 */
62 static void h1910_hwcontrol(struct mtd_info *mtd, int cmd,
63 unsigned int ctrl)
64 {
65 struct nand_chip *chip = mtd->priv;
66
67 if (cmd != NAND_CMD_NONE)
68 writeb(cmd, chip->IO_ADDR_W | ((ctrl & 0x6) << 1));
69 }
70
71 /*
72 * read device ready pin
73 */
74 #if 0
75 static int h1910_device_ready(struct mtd_info *mtd)
76 {
77 return (GPLR(55) & GPIO_bit(55));
78 }
79 #endif
80
81 /*
82 * Main initialization routine
83 */
84 static int __init h1910_init(void)
85 {
86 struct nand_chip *this;
87 const char *part_type = 0;
88 int mtd_parts_nb = 0;
89 struct mtd_partition *mtd_parts = 0;
90 void __iomem *nandaddr;
91
92 if (!machine_is_h1900())
93 return -ENODEV;
94
95 nandaddr = ioremap(0x08000000, 0x1000);
96 if (!nandaddr) {
97 printk("Failed to ioremap nand flash.\n");
98 return -ENOMEM;
99 }
100
101 /* Allocate memory for MTD device structure and private data */
102 h1910_nand_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
103 if (!h1910_nand_mtd) {
104 printk("Unable to allocate h1910 NAND MTD device structure.\n");
105 iounmap((void *)nandaddr);
106 return -ENOMEM;
107 }
108
109 /* Get pointer to private data */
110 this = (struct nand_chip *)(&h1910_nand_mtd[1]);
111
112 /* Initialize structures */
113 memset(h1910_nand_mtd, 0, sizeof(struct mtd_info));
114 memset(this, 0, sizeof(struct nand_chip));
115
116 /* Link the private data with the MTD structure */
117 h1910_nand_mtd->priv = this;
118 h1910_nand_mtd->owner = THIS_MODULE;
119
120 /*
121 * Enable VPEN
122 */
123 GPSR(37) = GPIO_bit(37);
124
125 /* insert callbacks */
126 this->IO_ADDR_R = nandaddr;
127 this->IO_ADDR_W = nandaddr;
128 this->cmd_ctrl = h1910_hwcontrol;
129 this->dev_ready = NULL; /* unknown whether that was correct or not so we will just do it like this */
130 /* 15 us command delay time */
131 this->chip_delay = 50;
132 this->ecc.mode = NAND_ECC_SOFT;
133 this->options = NAND_NO_AUTOINCR;
134
135 /* Scan to find existence of the device */
136 if (nand_scan(h1910_nand_mtd, 1)) {
137 printk(KERN_NOTICE "No NAND device - returning -ENXIO\n");
138 kfree(h1910_nand_mtd);
139 iounmap((void *)nandaddr);
140 return -ENXIO;
141 }
142 #ifdef CONFIG_MTD_CMDLINE_PARTS
143 mtd_parts_nb = parse_cmdline_partitions(h1910_nand_mtd, &mtd_parts, "h1910-nand");
144 if (mtd_parts_nb > 0)
145 part_type = "command line";
146 else
147 mtd_parts_nb = 0;
148 #endif
149 if (mtd_parts_nb == 0) {
150 mtd_parts = partition_info;
151 mtd_parts_nb = NUM_PARTITIONS;
152 part_type = "static";
153 }
154
155 /* Register the partitions */
156 printk(KERN_NOTICE "Using %s partition definition\n", part_type);
157 add_mtd_partitions(h1910_nand_mtd, mtd_parts, mtd_parts_nb);
158
159 /* Return happy */
160 return 0;
161 }
162
163 module_init(h1910_init);
164
165 /*
166 * Clean up routine
167 */
168 static void __exit h1910_cleanup(void)
169 {
170 struct nand_chip *this = (struct nand_chip *)&h1910_nand_mtd[1];
171
172 /* Release resources, unregister device */
173 nand_release(h1910_nand_mtd);
174
175 /* Release io resource */
176 iounmap((void *)this->IO_ADDR_W);
177
178 /* Free the MTD device structure */
179 kfree(h1910_nand_mtd);
180 }
181
182 module_exit(h1910_cleanup);
183
184 MODULE_LICENSE("GPL");
185 MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>");
186 MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910");
187
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