4 * Platform driver for NOR flash devices on ADM5120 based boards
6 * Copyright (C) 2007 OpenWrt.org
7 * Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
9 * This file was derived from: drivers/mtd/map/physmap.c
10 * Copyright (C) 2003 MontaVista Software Inc.
11 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version 2
16 * of the License, or (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the
25 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
26 * Boston, MA 02110-1301, USA.
30 #include <linux/module.h>
31 #include <linux/types.h>
32 #include <linux/kernel.h>
33 #include <linux/init.h>
34 #include <linux/slab.h>
35 #include <linux/device.h>
37 #include <linux/platform_device.h>
38 #include <linux/mtd/mtd.h>
39 #include <linux/mtd/map.h>
40 #include <linux/mtd/partitions.h>
44 #include <adm5120_defs.h>
45 #include <adm5120_switch.h>
46 #include <adm5120_mpmc.h>
47 #include <adm5120_platform.h>
49 #define DRV_NAME "adm5120-flash"
50 #define DRV_DESC "ADM5120 flash MAP driver"
51 #define MAX_PARSED_PARTS 8
53 #ifdef ADM5120_FLASH_DEBUG
54 #define MAP_DBG(m, f, a...) printk(KERN_INFO "%s: " f, (m->name) , ## a)
56 #define MAP_DBG(m, f, a...) do {} while (0)
58 #define MAP_ERR(m, f, a...) printk(KERN_ERR "%s: " f, (m->name) , ## a)
59 #define MAP_INFO(m, f, a...) printk(KERN_INFO "%s: " f, (m->name) , ## a)
61 struct adm5120_map_info {
63 void (*switch_bank)(unsigned);
64 unsigned long window_size;
67 struct adm5120_flash_info {
70 struct platform_device *dev;
71 struct adm5120_map_info amap;
72 #ifdef CONFIG_MTD_PARTITIONS
74 struct mtd_partition *parts[MAX_PARSED_PARTS];
86 static DEFINE_SPINLOCK(adm5120_flash_spin);
87 #define FLASH_LOCK() spin_lock(&adm5120_flash_spin)
88 #define FLASH_UNLOCK() spin_unlock(&adm5120_flash_spin)
90 static u32 flash_bankwidths[4] = { 1, 2, 4, 0 };
92 static u32 flash_sizes[8] = {
93 0, 512*1024, 1024*1024, 2*1024*1024,
97 static struct flash_desc flash_descs[2] = {
99 .phys = ADM5120_SRAM0_BASE,
100 .srs_shift = MEMCTRL_SRS0_SHIFT,
102 .phys = ADM5120_SRAM1_BASE,
103 .srs_shift = MEMCTRL_SRS1_SHIFT,
107 static const char *probe_types[] = {
114 #ifdef CONFIG_MTD_PARTITIONS
115 static const char *parse_types[] = {
117 #ifdef CONFIG_MTD_REDBOOT_PARTS
120 #ifdef CONFIG_MTD_MYLOADER_PARTS
126 #define BANK_SIZE (2<<20)
127 #define BANK_SIZE_MAX (4<<20)
128 #define BANK_OFFS_MASK (BANK_SIZE-1)
129 #define BANK_START_MASK (~BANK_OFFS_MASK)
131 static inline struct adm5120_map_info *map_to_amap(struct map_info *map)
133 return (struct adm5120_map_info *)map;
136 static void adm5120_flash_switchbank(struct map_info *map,
139 struct adm5120_map_info *amap = map_to_amap(map);
142 if (amap->switch_bank == NULL)
145 bank = (ofs & BANK_START_MASK) >> 21;
149 MAP_DBG(map, "switching to bank %u, ofs=%lX\n", bank, ofs);
150 amap->switch_bank(bank);
153 static map_word adm5120_flash_read(struct map_info *map, unsigned long ofs)
155 struct adm5120_map_info *amap = map_to_amap(map);
158 MAP_DBG(map, "reading from ofs %lX\n", ofs);
160 if (ofs >= amap->window_size)
161 return map_word_ff(map);
164 adm5120_flash_switchbank(map, ofs);
165 ret = inline_map_read(map, (ofs & (amap->window_size-1)));
171 static void adm5120_flash_write(struct map_info *map, const map_word datum,
174 struct adm5120_map_info *amap = map_to_amap(map);
176 MAP_DBG(map,"writing to ofs %lX\n", ofs);
178 if (ofs > amap->window_size)
182 adm5120_flash_switchbank(map, ofs);
183 inline_map_write(map, datum, (ofs & (amap->window_size-1)));
187 static void adm5120_flash_copy_from(struct map_info *map, void *to,
188 unsigned long from, ssize_t len)
190 struct adm5120_map_info *amap = map_to_amap(map);
194 MAP_DBG(map, "copy_from, to=%lX, from=%lX, len=%lX\n",
195 (unsigned long)to, from, (unsigned long)len);
197 if (from > amap->window_size)
203 if ((from < BANK_SIZE) && ((from+len) > BANK_SIZE))
207 MAP_DBG(map, "copying %lu byte(s) from %lX to %lX\n",
208 (unsigned long)t, (from & (amap->window_size-1)),
210 adm5120_flash_switchbank(map, from);
211 inline_map_copy_from(map, p, (from & (amap->window_size-1)), t);
219 static int adm5120_flash_initres(struct adm5120_flash_info *info)
221 struct map_info *map = &info->amap.map;
224 info->res = request_mem_region(map->phys, map->size, map->name);
225 if (info->res == NULL) {
226 MAP_ERR(map, "could not reserve memory region\n");
231 map->virt = ioremap_nocache(map->phys, map->size);
232 if (map->virt == NULL) {
233 MAP_ERR(map, "failed to ioremap flash region\n");
242 static int adm5120_flash_initinfo(struct adm5120_flash_info *info,
243 struct platform_device *dev)
245 struct map_info *map = &info->amap.map;
246 struct adm5120_flash_platform_data *pdata = dev->dev.platform_data;
247 struct flash_desc *fdesc;
250 map->name = dev->dev.bus_id;
253 MAP_ERR(map, "invalid flash id\n");
257 fdesc = &flash_descs[dev->id];
259 /* get memory window size */
260 t = SW_READ_REG(MEMCTRL) >> fdesc->srs_shift;
261 t &= MEMCTRL_SRS_MASK;
262 info->amap.window_size = flash_sizes[t];
263 if (info->amap.window_size == 0) {
264 MAP_ERR(map, "invalid flash size detected\n");
268 /* get flash bus width */
271 t = MPMC_READ_REG(SC1) & SC_MW_MASK;
274 t = MPMC_READ_REG(SC0) & SC_MW_MASK;
277 map->bankwidth = flash_bankwidths[t];
278 if (map->bankwidth == 0) {
279 MAP_ERR(map, "invalid bus width detected\n");
283 map->phys = fdesc->phys;
284 map->size = BANK_SIZE_MAX;
286 simple_map_init(map);
287 map->read = adm5120_flash_read;
288 map->write = adm5120_flash_write;
289 map->copy_from = adm5120_flash_copy_from;
292 map->set_vpp = pdata->set_vpp;
293 info->amap.switch_bank = pdata->switch_bank;
298 MAP_INFO(map, "probing at 0x%lX, size:%ldKiB, width:%d bits\n",
299 (unsigned long)map->phys,
300 (unsigned long)info->amap.window_size >> 10,
309 static void adm5120_flash_initbanks(struct adm5120_flash_info *info)
311 struct map_info *map = &info->amap.map;
313 if (info->mtd->size <= BANK_SIZE)
314 /* no bank switching needed */
317 if (info->amap.switch_bank) {
318 info->amap.window_size = info->mtd->size;
322 MAP_ERR(map, "reduce visibility from %ldKiB to %ldKiB\n",
323 (unsigned long)map->size >> 10,
324 (unsigned long)info->mtd->size >> 10);
326 info->mtd->size = info->amap.window_size;
329 #ifdef CONFIG_MTD_PARTITIONS
330 static int adm5120_flash_initparts(struct adm5120_flash_info *info)
332 struct adm5120_flash_platform_data *pdata = info->dev->dev.platform_data;
333 struct map_info *map = &info->amap.map;
335 const char *parser[2];
345 if (pdata->nr_parts) {
346 MAP_INFO(map, "adding static partitions\n");
347 err = add_mtd_partitions(info->mtd, pdata->parts,
350 info->nr_parts += pdata->nr_parts;
355 num_parsers = ARRAY_SIZE(parse_types);
356 if (num_parsers > MAX_PARSED_PARTS)
357 num_parsers = MAX_PARSED_PARTS;
360 for (i=0; i<num_parsers; i++) {
361 parser[0] = parse_types[i];
363 MAP_INFO(map, "parsing \"%s\" partitions\n",
365 nr_parts = parse_mtd_partitions(info->mtd, parser,
371 MAP_INFO(map, "adding \"%s\" partitions\n",
374 err = add_mtd_partitions(info->mtd, info->parts[i], nr_parts);
378 info->nr_parts += nr_parts;
384 static int adm5120_flash_initparts(struct adm5120_flash_info *info)
388 #endif /* CONFIG_MTD_PARTITIONS */
390 #ifdef CONFIG_MTD_PARTITIONS
391 static void adm5120_flash_remove_mtd(struct adm5120_flash_info *info)
395 if (info->nr_parts) {
396 del_mtd_partitions(info->mtd);
397 for (i=0; i<MAX_PARSED_PARTS; i++)
398 if (info->parts[i] != NULL)
399 kfree(info->parts[i]);
401 del_mtd_device(info->mtd);
405 static void adm5120_flash_remove_mtd(struct adm5120_flash_info *info)
407 del_mtd_device(info->mtd);
411 static int adm5120_flash_remove(struct platform_device *dev)
413 struct adm5120_flash_info *info;
415 info = platform_get_drvdata(dev);
419 platform_set_drvdata(dev, NULL);
421 if (info->mtd != NULL) {
422 adm5120_flash_remove_mtd(info);
423 map_destroy(info->mtd);
426 if (info->amap.map.virt != NULL)
427 iounmap(info->amap.map.virt);
429 if (info->res != NULL) {
430 release_resource(info->res);
437 static int adm5120_flash_probe(struct platform_device *dev)
439 struct adm5120_flash_info *info;
440 struct map_info *map;
441 const char **probe_type;
444 info = kzalloc(sizeof(*info), GFP_KERNEL);
450 platform_set_drvdata(dev, info);
452 err = adm5120_flash_initinfo(info, dev);
456 err = adm5120_flash_initres(info);
460 map = &info->amap.map;
461 for (probe_type = probe_types; info->mtd == NULL && *probe_type != NULL;
463 info->mtd = do_map_probe(*probe_type, map);
465 if (info->mtd == NULL) {
466 MAP_ERR(map, "map_probe failed\n");
471 adm5120_flash_initbanks(info);
473 if (info->mtd->size < info->amap.window_size) {
474 /* readjust resources */
476 release_resource(info->res);
479 info->amap.window_size = info->mtd->size;
480 map->size = info->mtd->size;
481 MAP_INFO(map, "reducing map size to %ldKiB\n",
482 (unsigned long)map->size >> 10);
483 err = adm5120_flash_initres(info);
488 MAP_INFO(map, "found at 0x%lX, size:%ldKiB, width:%d bits\n",
489 (unsigned long)map->phys, (unsigned long)info->mtd->size >> 10,
492 info->mtd->owner = THIS_MODULE;
494 err = adm5120_flash_initparts(info);
498 if (info->nr_parts == 0) {
499 MAP_INFO(map, "no partitions available, registering whole flash\n");
500 add_mtd_device(info->mtd);
506 adm5120_flash_remove(dev);
511 static int adm5120_flash_suspend(struct platform_device *dev, pm_message_t state)
513 struct adm5120_flash_info *info = platform_get_drvdata(dev);
517 ret = info->mtd->suspend(info->mtd);
522 static int adm5120_flash_resume(struct platform_device *dev)
524 struct adm5120_flash_info *info = platform_get_drvdata(dev);
527 info->mtd->resume(info->mtd);
532 static void adm5120_flash_shutdown(struct platform_device *dev)
534 struct adm5120_flash_info *info = platform_get_drvdata(dev);
536 if (info && info->mtd->suspend(info->mtd) == 0)
537 info->mtd->resume(info->mtd);
541 static struct platform_driver adm5120_flash_driver = {
542 .probe = adm5120_flash_probe,
543 .remove = adm5120_flash_remove,
545 .suspend = adm5120_flash_suspend,
546 .resume = adm5120_flash_resume,
547 .shutdown = adm5120_flash_shutdown,
554 static int __init adm5120_flash_init(void)
558 err = platform_driver_register(&adm5120_flash_driver);
563 static void __exit adm5120_flash_exit(void)
565 platform_driver_unregister(&adm5120_flash_driver);
568 module_init(adm5120_flash_init);
569 module_exit(adm5120_flash_exit);
571 MODULE_LICENSE("GPL");
572 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
573 MODULE_DESCRIPTION(DRV_DESC);