Merge with Linux 2.5.74.
[linux-2.6/linux-mips.git] / drivers / mtd / maps / elan-104nc.c
blobfe0bfe0f18bc236bc5f55e73f297b055dfd1d54c
1 /* elan-104nc.c -- MTD map driver for Arcom Control Systems ELAN-104NC
3 Copyright (C) 2000 Arcom Control System Ltd
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
19 $Id: elan-104nc.c,v 1.18 2003/06/23 07:37:02 dwmw2 Exp $
21 The ELAN-104NC has up to 8 Mibyte of Intel StrataFlash (28F320/28F640) in x16
22 mode. This drivers uses the CFI probe and Intel Extended Command Set drivers.
24 The flash is accessed as follows:
26 32 kbyte memory window at 0xb0000-0xb7fff
28 16 bit I/O port (0x22) for some sort of paging.
30 The single flash device is divided into 3 partition which appear as seperate
31 MTD devices.
33 Linux thinks that the I/O port is used by the PIC and hence check_region() will
34 always fail. So we don't do it. I just hope it doesn't break anything.
36 #include <linux/module.h>
37 #include <linux/slab.h>
38 #include <linux/ioport.h>
39 #include <linux/init.h>
40 #include <asm/io.h>
42 #include <linux/mtd/map.h>
43 #include <linux/mtd/mtd.h>
44 #include <linux/mtd/partitions.h>
46 #define WINDOW_START 0xb0000
47 /* Number of bits in offset. */
48 #define WINDOW_SHIFT 15
49 #define WINDOW_LENGTH (1 << WINDOW_SHIFT)
50 /* The bits for the offset into the window. */
51 #define WINDOW_MASK (WINDOW_LENGTH-1)
52 #define PAGE_IO 0x22
53 #define PAGE_IO_SIZE 2
55 static volatile int page_in_window = -1; // Current page in window.
56 static unsigned long iomapadr;
57 static spinlock_t elan_104nc_spin = SPIN_LOCK_UNLOCKED;
59 /* partition_info gives details on the logical partitions that the split the
60 * single flash device into. If the size if zero we use up to the end of the
61 * device. */
62 static struct mtd_partition partition_info[]={
63 { .name = "ELAN-104NC flash boot partition",
64 .offset = 0,
65 .size = 640*1024 },
66 { .name = "ELAN-104NC flash partition 1",
67 .offset = 640*1024,
68 .size = 896*1024 },
69 { .name = "ELAN-104NC flash partition 2",
70 .offset = (640+896)*1024 }
72 #define NUM_PARTITIONS (sizeof(partition_info)/sizeof(partition_info[0]))
75 * If no idea what is going on here. This is taken from the FlashFX stuff.
77 #define ROMCS 1
79 static inline void elan_104nc_setup(void)
81 u16 t;
83 outw( 0x0023 + ROMCS*2, PAGE_IO );
84 t=inb( PAGE_IO+1 );
86 t=(t & 0xf9) | 0x04;
88 outw( ((0x0023 + ROMCS*2) | (t << 8)), PAGE_IO );
91 static inline void elan_104nc_page(struct map_info *map, unsigned long ofs)
93 unsigned long page = ofs >> WINDOW_SHIFT;
95 if( page!=page_in_window ) {
96 int cmd1;
97 int cmd2;
99 cmd1=(page & 0x700) + 0x0833 + ROMCS*0x4000;
100 cmd2=((page & 0xff) << 8) + 0x0032;
102 outw( cmd1, PAGE_IO );
103 outw( cmd2, PAGE_IO );
105 page_in_window = page;
110 static __u8 elan_104nc_read8(struct map_info *map, unsigned long ofs)
112 __u8 ret;
113 spin_lock(&elan_104nc_spin);
114 elan_104nc_page(map, ofs);
115 ret = readb(iomapadr + (ofs & WINDOW_MASK));
116 spin_unlock(&elan_104nc_spin);
117 return ret;
120 static __u16 elan_104nc_read16(struct map_info *map, unsigned long ofs)
122 __u16 ret;
123 spin_lock(&elan_104nc_spin);
124 elan_104nc_page(map, ofs);
125 ret = readw(iomapadr + (ofs & WINDOW_MASK));
126 spin_unlock(&elan_104nc_spin);
127 return ret;
130 static __u32 elan_104nc_read32(struct map_info *map, unsigned long ofs)
132 __u32 ret;
133 spin_lock(&elan_104nc_spin);
134 elan_104nc_page(map, ofs);
135 ret = readl(iomapadr + (ofs & WINDOW_MASK));
136 spin_unlock(&elan_104nc_spin);
137 return ret;
140 static void elan_104nc_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
142 while(len) {
143 unsigned long thislen = len;
144 if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
145 thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
147 spin_lock(&elan_104nc_spin);
148 elan_104nc_page(map, from);
149 memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);
150 spin_unlock(&elan_104nc_spin);
151 (__u8*)to += thislen;
152 from += thislen;
153 len -= thislen;
157 static void elan_104nc_write8(struct map_info *map, __u8 d, unsigned long adr)
159 spin_lock(&elan_104nc_spin);
160 elan_104nc_page(map, adr);
161 writeb(d, iomapadr + (adr & WINDOW_MASK));
162 spin_unlock(&elan_104nc_spin);
165 static void elan_104nc_write16(struct map_info *map, __u16 d, unsigned long adr)
167 spin_lock(&elan_104nc_spin);
168 elan_104nc_page(map, adr);
169 writew(d, iomapadr + (adr & WINDOW_MASK));
170 spin_unlock(&elan_104nc_spin);
173 static void elan_104nc_write32(struct map_info *map, __u32 d, unsigned long adr)
175 spin_lock(&elan_104nc_spin);
176 elan_104nc_page(map, adr);
177 writel(d, iomapadr + (adr & WINDOW_MASK));
178 spin_unlock(&elan_104nc_spin);
181 static void elan_104nc_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
183 while(len) {
184 unsigned long thislen = len;
185 if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
186 thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
188 spin_lock(&elan_104nc_spin);
189 elan_104nc_page(map, to);
190 memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);
191 spin_unlock(&elan_104nc_spin);
192 to += thislen;
193 from += thislen;
194 len -= thislen;
198 static struct map_info elan_104nc_map = {
199 .name = "ELAN-104NC flash",
200 .phys = NO_XIP,
201 .size = 8*1024*1024, /* this must be set to a maximum possible amount
202 of flash so the cfi probe routines find all
203 the chips */
204 .buswidth = 2,
205 .read8 = elan_104nc_read8,
206 .read16 = elan_104nc_read16,
207 .read32 = elan_104nc_read32,
208 .copy_from = elan_104nc_copy_from,
209 .write8 = elan_104nc_write8,
210 .write16 = elan_104nc_write16,
211 .write32 = elan_104nc_write32,
212 .copy_to = elan_104nc_copy_to
215 /* MTD device for all of the flash. */
216 static struct mtd_info *all_mtd;
218 static void cleanup_elan_104nc(void)
220 if( all_mtd ) {
221 del_mtd_partitions( all_mtd );
222 map_destroy( all_mtd );
225 iounmap((void *)iomapadr);
228 int __init init_elan_104nc(void)
230 /* Urg! We use I/O port 0x22 without request_region()ing it,
231 because it's already allocated to the PIC. */
233 iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH);
234 if (!iomapadr) {
235 printk( KERN_ERR"%s: failed to ioremap memory region\n",
236 elan_104nc_map.name );
237 return -EIO;
240 printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",
241 elan_104nc_map.name,
242 PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,
243 WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );
245 elan_104nc_setup();
247 /* Probe for chip. */
248 all_mtd = do_map_probe("cfi_probe", &elan_104nc_map );
249 if( !all_mtd ) {
250 cleanup_elan_104nc();
251 return -ENXIO;
254 all_mtd->owner = THIS_MODULE;
256 /* Create MTD devices for each partition. */
257 add_mtd_partitions( all_mtd, partition_info, NUM_PARTITIONS );
259 return 0;
262 module_init(init_elan_104nc);
263 module_exit(cleanup_elan_104nc);
266 MODULE_LICENSE("GPL");
267 MODULE_AUTHOR("Arcom Control Systems Ltd.");
268 MODULE_DESCRIPTION("MTD map driver for Arcom Control Systems ELAN-104NC");