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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* sbc_gxx.c -- MTD map driver for Arcom Control Systems SBC-MediaGX,
2 SBC-GXm and SBC-GX1 series boards.
Thomas Gleixner69f34c92005-11-07 11:15:40 +00003
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 Copyright (C) 2001 Arcom Control System Ltd
Thomas Gleixner69f34c92005-11-07 11:15:40 +00005
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
Thomas Gleixner69f34c92005-11-07 11:15:40 +000010
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
Thomas Gleixner69f34c92005-11-07 11:15:40 +000015
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
19
Thomas Gleixner69f34c92005-11-07 11:15:40 +000020 $Id: sbc_gxx.c,v 1.35 2005/11/07 11:14:28 gleixner Exp $
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Thomas Gleixner69f34c92005-11-07 11:15:40 +000022The SBC-MediaGX / SBC-GXx has up to 16 MiB of
23Intel StrataFlash (28F320/28F640) in x8 mode.
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25This driver uses the CFI probe and Intel Extended Command Set drivers.
26
27The flash is accessed as follows:
28
29 16 KiB memory window at 0xdc000-0xdffff
Thomas Gleixner69f34c92005-11-07 11:15:40 +000030
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 Two IO address locations for paging
Thomas Gleixner69f34c92005-11-07 11:15:40 +000032
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 0x258
34 bit 0-7: address bit 14-21
35 0x259
36 bit 0-1: address bit 22-23
37 bit 7: 0 - reset/powered down
38 1 - device enabled
39
Thomas Gleixner69f34c92005-11-07 11:15:40 +000040The single flash device is divided into 3 partition which appear as
Linus Torvalds1da177e2005-04-16 15:20:36 -070041separate MTD devices.
42
4325/04/2001 AJL (Arcom) Modified signon strings and partition sizes
44 (to support bzImages up to 638KiB-ish)
45*/
46
47// Includes
48
49#include <linux/module.h>
50#include <linux/slab.h>
51#include <linux/ioport.h>
52#include <linux/init.h>
53#include <asm/io.h>
54
55#include <linux/mtd/mtd.h>
56#include <linux/mtd/map.h>
57#include <linux/mtd/partitions.h>
58
59// Defines
60
61// - Hardware specific
62
63#define WINDOW_START 0xdc000
64
65/* Number of bits in offset. */
66#define WINDOW_SHIFT 14
67#define WINDOW_LENGTH (1 << WINDOW_SHIFT)
68
69/* The bits for the offset into the window. */
70#define WINDOW_MASK (WINDOW_LENGTH-1)
71#define PAGE_IO 0x258
72#define PAGE_IO_SIZE 2
73
74/* bit 7 of 0x259 must be 1 to enable device. */
75#define DEVICE_ENABLE 0x8000
76
77// - Flash / Partition sizing
78
79#define MAX_SIZE_KiB 16384
80#define BOOT_PARTITION_SIZE_KiB 768
81#define DATA_PARTITION_SIZE_KiB 1280
82#define APP_PARTITION_SIZE_KiB 6144
83
84// Globals
85
86static volatile int page_in_window = -1; // Current page in window.
87static void __iomem *iomapadr;
88static DEFINE_SPINLOCK(sbc_gxx_spin);
89
Thomas Gleixner69f34c92005-11-07 11:15:40 +000090/* partition_info gives details on the logical partitions that the split the
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 * single flash device into. If the size if zero we use up to the end of the
92 * device. */
93static struct mtd_partition partition_info[]={
Thomas Gleixner69f34c92005-11-07 11:15:40 +000094 { .name = "SBC-GXx flash boot partition",
95 .offset = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 .size = BOOT_PARTITION_SIZE_KiB*1024 },
Thomas Gleixner69f34c92005-11-07 11:15:40 +000097 { .name = "SBC-GXx flash data partition",
98 .offset = BOOT_PARTITION_SIZE_KiB*1024,
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 .size = (DATA_PARTITION_SIZE_KiB)*1024 },
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000100 { .name = "SBC-GXx flash application partition",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 .offset = (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 }
102};
103
104#define NUM_PARTITIONS 3
105
106static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs)
107{
108 unsigned long page = ofs >> WINDOW_SHIFT;
109
110 if( page!=page_in_window ) {
111 outw( page | DEVICE_ENABLE, PAGE_IO );
112 page_in_window = page;
113 }
114}
115
116
117static map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs)
118{
119 map_word ret;
120 spin_lock(&sbc_gxx_spin);
121 sbc_gxx_page(map, ofs);
122 ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK));
123 spin_unlock(&sbc_gxx_spin);
124 return ret;
125}
126
127static void sbc_gxx_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
128{
129 while(len) {
130 unsigned long thislen = len;
131 if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
132 thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 spin_lock(&sbc_gxx_spin);
135 sbc_gxx_page(map, from);
136 memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);
137 spin_unlock(&sbc_gxx_spin);
138 to += thislen;
139 from += thislen;
140 len -= thislen;
141 }
142}
143
144static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr)
145{
146 spin_lock(&sbc_gxx_spin);
147 sbc_gxx_page(map, adr);
148 writeb(d.x[0], iomapadr + (adr & WINDOW_MASK));
149 spin_unlock(&sbc_gxx_spin);
150}
151
152static void sbc_gxx_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000153{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 while(len) {
155 unsigned long thislen = len;
156 if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
157 thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 spin_lock(&sbc_gxx_spin);
160 sbc_gxx_page(map, to);
161 memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);
162 spin_unlock(&sbc_gxx_spin);
163 to += thislen;
164 from += thislen;
165 len -= thislen;
166 }
167}
168
169static struct map_info sbc_gxx_map = {
170 .name = "SBC-GXx flash",
171 .phys = NO_XIP,
172 .size = MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount
173 of flash so the cfi probe routines find all
174 the chips */
175 .bankwidth = 1,
176 .read = sbc_gxx_read8,
177 .copy_from = sbc_gxx_copy_from,
178 .write = sbc_gxx_write8,
179 .copy_to = sbc_gxx_copy_to
180};
181
182/* MTD device for all of the flash. */
183static struct mtd_info *all_mtd;
184
185static void cleanup_sbc_gxx(void)
186{
187 if( all_mtd ) {
188 del_mtd_partitions( all_mtd );
189 map_destroy( all_mtd );
190 }
191
192 iounmap(iomapadr);
193 release_region(PAGE_IO,PAGE_IO_SIZE);
194}
195
196static int __init init_sbc_gxx(void)
197{
198 iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH);
199 if (!iomapadr) {
200 printk( KERN_ERR"%s: failed to ioremap memory region\n",
201 sbc_gxx_map.name );
202 return -EIO;
203 }
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 if (!request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash")) {
206 printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n",
207 sbc_gxx_map.name,
208 PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 );
209 iounmap(iomapadr);
210 return -EAGAIN;
211 }
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000212
213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",
215 sbc_gxx_map.name,
216 PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,
217 WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );
218
219 /* Probe for chip. */
220 all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map );
221 if( !all_mtd ) {
222 cleanup_sbc_gxx();
223 return -ENXIO;
224 }
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 all_mtd->owner = THIS_MODULE;
227
228 /* Create MTD devices for each partition. */
229 add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS );
230
231 return 0;
232}
233
234module_init(init_sbc_gxx);
235module_exit(cleanup_sbc_gxx);
236
237MODULE_LICENSE("GPL");
238MODULE_AUTHOR("Arcom Control Systems Ltd.");
239MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards");