dc21285.c (2fc2991175bf77395e6b15fe6b2304d3bf72da40) dc21285.c (69f34c98c1416eb74c55e38a21dbf3e294966514)
1/*
2 * MTD map driver for flash on the DC21285 (the StrongARM-110 companion chip)
3 *
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
5 *
6 * This code is GPL
1/*
2 * MTD map driver for flash on the DC21285 (the StrongARM-110 companion chip)
3 *
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
5 *
6 * This code is GPL
7 *
8 * $Id: dc21285.c,v 1.22 2004/11/01 13:39:21 rmk Exp $
7 *
8 * $Id: dc21285.c,v 1.24 2005/11/07 11:14:26 gleixner Exp $
9 */
10#include <linux/config.h>
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/delay.h>
16#include <linux/slab.h>

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22#include <asm/io.h>
23#include <asm/hardware/dec21285.h>
24#include <asm/mach-types.h>
25
26
27static struct mtd_info *dc21285_mtd;
28
29#ifdef CONFIG_ARCH_NETWINDER
9 */
10#include <linux/config.h>
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/delay.h>
16#include <linux/slab.h>

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22#include <asm/io.h>
23#include <asm/hardware/dec21285.h>
24#include <asm/mach-types.h>
25
26
27static struct mtd_info *dc21285_mtd;
28
29#ifdef CONFIG_ARCH_NETWINDER
30/*
30/*
31 * This is really ugly, but it seams to be the only
31 * This is really ugly, but it seams to be the only
32 * realiable way to do it, as the cpld state machine
32 * realiable way to do it, as the cpld state machine
33 * is unpredictible. So we have a 25us penalty per
34 * write access.
35 */
36static void nw_en_write(void)
37{
38 extern spinlock_t gpio_lock;
39 unsigned long flags;
40

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145};
146
147
148/* Partition stuff */
149#ifdef CONFIG_MTD_PARTITIONS
150static struct mtd_partition *dc21285_parts;
151static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
152#endif
33 * is unpredictible. So we have a 25us penalty per
34 * write access.
35 */
36static void nw_en_write(void)
37{
38 extern spinlock_t gpio_lock;
39 unsigned long flags;
40

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145};
146
147
148/* Partition stuff */
149#ifdef CONFIG_MTD_PARTITIONS
150static struct mtd_partition *dc21285_parts;
151static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
152#endif
153
153
154static int __init init_dc21285(void)
155{
156
157#ifdef CONFIG_MTD_PARTITIONS
158 int nrparts;
159#endif
160
161 /* Determine bankwidth */
162 switch (*CSR_SA110_CNTL & (3<<14)) {
154static int __init init_dc21285(void)
155{
156
157#ifdef CONFIG_MTD_PARTITIONS
158 int nrparts;
159#endif
160
161 /* Determine bankwidth */
162 switch (*CSR_SA110_CNTL & (3<<14)) {
163 case SA110_CNTL_ROMWIDTH_8:
163 case SA110_CNTL_ROMWIDTH_8:
164 dc21285_map.bankwidth = 1;
165 dc21285_map.read = dc21285_read8;
166 dc21285_map.write = dc21285_write8;
167 dc21285_map.copy_to = dc21285_copy_to_8;
168 break;
164 dc21285_map.bankwidth = 1;
165 dc21285_map.read = dc21285_read8;
166 dc21285_map.write = dc21285_write8;
167 dc21285_map.copy_to = dc21285_copy_to_8;
168 break;
169 case SA110_CNTL_ROMWIDTH_16:
170 dc21285_map.bankwidth = 2;
169 case SA110_CNTL_ROMWIDTH_16:
170 dc21285_map.bankwidth = 2;
171 dc21285_map.read = dc21285_read16;
172 dc21285_map.write = dc21285_write16;
173 dc21285_map.copy_to = dc21285_copy_to_16;
174 break;
171 dc21285_map.read = dc21285_read16;
172 dc21285_map.write = dc21285_write16;
173 dc21285_map.copy_to = dc21285_copy_to_16;
174 break;
175 case SA110_CNTL_ROMWIDTH_32:
176 dc21285_map.bankwidth = 4;
175 case SA110_CNTL_ROMWIDTH_32:
176 dc21285_map.bankwidth = 4;
177 dc21285_map.read = dc21285_read32;
178 dc21285_map.write = dc21285_write32;
179 dc21285_map.copy_to = dc21285_copy_to_32;
180 break;
181 default:
182 printk (KERN_ERR "DC21285 flash: undefined bankwidth\n");
183 return -ENXIO;
184 }

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196 dc21285_mtd = do_map_probe("cfi_probe", &dc21285_map);
197 } else {
198 dc21285_mtd = do_map_probe("jedec_probe", &dc21285_map);
199 }
200
201 if (!dc21285_mtd) {
202 iounmap(dc21285_map.virt);
203 return -ENXIO;
177 dc21285_map.read = dc21285_read32;
178 dc21285_map.write = dc21285_write32;
179 dc21285_map.copy_to = dc21285_copy_to_32;
180 break;
181 default:
182 printk (KERN_ERR "DC21285 flash: undefined bankwidth\n");
183 return -ENXIO;
184 }

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196 dc21285_mtd = do_map_probe("cfi_probe", &dc21285_map);
197 } else {
198 dc21285_mtd = do_map_probe("jedec_probe", &dc21285_map);
199 }
200
201 if (!dc21285_mtd) {
202 iounmap(dc21285_map.virt);
203 return -ENXIO;
204 }
205
204 }
205
206 dc21285_mtd->owner = THIS_MODULE;
207
208#ifdef CONFIG_MTD_PARTITIONS
209 nrparts = parse_mtd_partitions(dc21285_mtd, probes, &dc21285_parts, 0);
210 if (nrparts > 0)
211 add_mtd_partitions(dc21285_mtd, dc21285_parts, nrparts);
206 dc21285_mtd->owner = THIS_MODULE;
207
208#ifdef CONFIG_MTD_PARTITIONS
209 nrparts = parse_mtd_partitions(dc21285_mtd, probes, &dc21285_parts, 0);
210 if (nrparts > 0)
211 add_mtd_partitions(dc21285_mtd, dc21285_parts, nrparts);
212 else
213#endif
212 else
213#endif
214 add_mtd_device(dc21285_mtd);
214 add_mtd_device(dc21285_mtd);
215
215
216 if(machine_is_ebsa285()) {
216 if(machine_is_ebsa285()) {
217 /*
217 /*
218 * Flash timing is determined with bits 19-16 of the
219 * CSR_SA110_CNTL. The value is the number of wait cycles, or
220 * 0 for 16 cycles (the default). Cycles are 20 ns.
221 * Here we use 7 for 140 ns flash chips.
222 */
223 /* access time */
224 *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x000f0000) | (7 << 16));
225 /* burst time */
226 *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x00f00000) | (7 << 20));
227 /* tristate time */
228 *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x0f000000) | (7 << 24));
229 }
218 * Flash timing is determined with bits 19-16 of the
219 * CSR_SA110_CNTL. The value is the number of wait cycles, or
220 * 0 for 16 cycles (the default). Cycles are 20 ns.
221 * Here we use 7 for 140 ns flash chips.
222 */
223 /* access time */
224 *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x000f0000) | (7 << 16));
225 /* burst time */
226 *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x00f00000) | (7 << 20));
227 /* tristate time */
228 *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x0f000000) | (7 << 24));
229 }
230
230
231 return 0;
232}
233
234static void __exit cleanup_dc21285(void)
235{
236#ifdef CONFIG_MTD_PARTITIONS
237 if (dc21285_parts) {
238 del_mtd_partitions(dc21285_mtd);

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231 return 0;
232}
233
234static void __exit cleanup_dc21285(void)
235{
236#ifdef CONFIG_MTD_PARTITIONS
237 if (dc21285_parts) {
238 del_mtd_partitions(dc21285_mtd);

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