[deliverable/linux.git] / drivers / mtd / maps / ceiva.c

/*
 * Ceiva flash memory driver.
 * Copyright (C) 2002 Rob Scott <rscott@mtrob.fdns.net>
 *
 * Note: this driver supports jedec compatible devices. Modification
 * for CFI compatible devices should be straight forward: change
 * jedec_probe to cfi_probe.
 *
 * Based on: sa1100-flash.c, which has the following copyright:
 * Flash memory access on SA11x0 based devices
 *
 * (C) 2000 Nicolas Pitre <nico@cam.org>
 *
 * $Id: ceiva.c,v 1.11 2004/09/16 23:27:12 gleixner Exp $
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/concat.h>

#include <asm/hardware.h>
#include <asm/mach-types.h>
#include <asm/io.h>
#include <asm/sizes.h>

/*
 * This isn't complete yet, so...
 */
#define CONFIG_MTD_CEIVA_STATICMAP

#ifdef CONFIG_MTD_CEIVA_STATICMAP
/*
 * See include/linux/mtd/partitions.h for definition of the mtd_partition
 * structure.
 *
 * Please note:
 *  1. The flash size given should be the largest flash size that can
 *     be accomodated.
 *
 *  2. The bus width must defined in clps_setup_flash.
 *
 * The MTD layer will detect flash chip aliasing and reduce the size of
 * the map accordingly.
 *
 */

#ifdef CONFIG_ARCH_CEIVA
/* Flash / Partition sizing */
/* For the 28F8003, we use the block mapping to calcuate the sizes */
#define MAX_SIZE_KiB                  (16 + 8 + 8 + 96 + (7*128))
#define BOOT_PARTITION_SIZE_KiB       (16)
#define PARAMS_PARTITION_SIZE_KiB     (8)
#define KERNEL_PARTITION_SIZE_KiB     (4*128)
/* Use both remaing portion of first flash, and all of second flash */
#define ROOT_PARTITION_SIZE_KiB       (3*128) + (8*128)

static struct mtd_partition ceiva_partitions[] = {
	{
		.name = "Ceiva BOOT partition",
		.size   = BOOT_PARTITION_SIZE_KiB*1024,
		.offset = 0,

	},{
		.name = "Ceiva parameters partition",
		.size   = PARAMS_PARTITION_SIZE_KiB*1024,
		.offset = (16 + 8) * 1024,
	},{
		.name = "Ceiva kernel partition",
		.size = (KERNEL_PARTITION_SIZE_KiB)*1024,
		.offset = 0x20000,

	},{
		.name = "Ceiva root filesystem partition",
		.offset = MTDPART_OFS_APPEND,
		.size = (ROOT_PARTITION_SIZE_KiB)*1024,
	}
};
#endif

static int __init clps_static_partitions(struct mtd_partition **parts)
{
	int nb_parts = 0;

#ifdef CONFIG_ARCH_CEIVA
	if (machine_is_ceiva()) {
		*parts       = ceiva_partitions;
		nb_parts     = ARRAY_SIZE(ceiva_partitions);
	}
#endif
	return nb_parts;
}
#endif

struct clps_info {
	unsigned long base;
	unsigned long size;
	int width;
	void *vbase;
	struct map_info *map;
	struct mtd_info *mtd;
	struct resource *res;
};

#define NR_SUBMTD 4

static struct clps_info info[NR_SUBMTD];

static int __init clps_setup_mtd(struct clps_info *clps, int nr, struct mtd_info **rmtd)
{
	struct mtd_info *subdev[nr];
	struct map_info *maps;
	int i, found = 0, ret = 0;

	/*
	 * Allocate the map_info structs in one go.
	 */
	maps = kmalloc(sizeof(struct map_info) * nr, GFP_KERNEL);
	if (!maps)
		return -ENOMEM;
	memset(maps, 0, sizeof(struct map_info) * nr);
	/*
	 * Claim and then map the memory regions.
	 */
	for (i = 0; i < nr; i++) {
		if (clps[i].base == (unsigned long)-1)
			break;

		clps[i].res = request_mem_region(clps[i].base, clps[i].size, "clps flash");
		if (!clps[i].res) {
			ret = -EBUSY;
			break;
		}

		clps[i].map = maps + i;

		clps[i].map->name = "clps flash";
		clps[i].map->phys = clps[i].base;

		clps[i].vbase = ioremap(clps[i].base, clps[i].size);
		if (!clps[i].vbase) {
			ret = -ENOMEM;
			break;
		}

		clps[i].map->virt = (void __iomem *)clps[i].vbase;
		clps[i].map->bankwidth = clps[i].width;
		clps[i].map->size = clps[i].size;

		simple_map_init(&clps[i].map);

		clps[i].mtd = do_map_probe("jedec_probe", clps[i].map);
		if (clps[i].mtd == NULL) {
			ret = -ENXIO;
			break;
		}
		clps[i].mtd->owner = THIS_MODULE;
		subdev[i] = clps[i].mtd;

		printk(KERN_INFO "clps flash: JEDEC device at 0x%08lx, %dMiB, "
			"%d-bit\n", clps[i].base, clps[i].mtd->size >> 20,
			clps[i].width * 8);
		found += 1;
	}

	/*
	 * ENXIO is special.  It means we didn't find a chip when
	 * we probed.  We need to tear down the mapping, free the
	 * resource and mark it as such.
	 */
	if (ret == -ENXIO) {
		iounmap(clps[i].vbase);
		clps[i].vbase = NULL;
		release_resource(clps[i].res);
		clps[i].res = NULL;
	}

	/*
	 * If we found one device, don't bother with concat support.
	 * If we found multiple devices, use concat if we have it
	 * available, otherwise fail.
	 */
	if (ret == 0 || ret == -ENXIO) {
		if (found == 1) {
			*rmtd = subdev[0];
			ret = 0;
		} else if (found > 1) {
			/*
			 * We detected multiple devices.  Concatenate
			 * them together.
			 */
#ifdef CONFIG_MTD_CONCAT
			*rmtd = mtd_concat_create(subdev, found,
						  "clps flash");
			if (*rmtd == NULL)
				ret = -ENXIO;
#else
			printk(KERN_ERR "clps flash: multiple devices "
			       "found but MTD concat support disabled.\n");
			ret = -ENXIO;
#endif
		}
	}

	/*
	 * If we failed, clean up.
	 */
	if (ret) {
		do {
			if (clps[i].mtd)
				map_destroy(clps[i].mtd);
			if (clps[i].vbase)
				iounmap(clps[i].vbase);
			if (clps[i].res)
				release_resource(clps[i].res);
		} while (i--);

		kfree(maps);
	}

	return ret;
}

static void __exit clps_destroy_mtd(struct clps_info *clps, struct mtd_info *mtd)
{
	int i;

	del_mtd_partitions(mtd);

	if (mtd != clps[0].mtd)
		mtd_concat_destroy(mtd);

	for (i = NR_SUBMTD; i >= 0; i--) {
		if (clps[i].mtd)
			map_destroy(clps[i].mtd);
		if (clps[i].vbase)
			iounmap(clps[i].vbase);
		if (clps[i].res)
			release_resource(clps[i].res);
	}
	kfree(clps[0].map);
}

/*
 * We define the memory space, size, and width for the flash memory
 * space here.
 */

static int __init clps_setup_flash(void)
{
	int nr;

#ifdef CONFIG_ARCH_CEIVA
	if (machine_is_ceiva()) {
		info[0].base = CS0_PHYS_BASE;
		info[0].size = SZ_32M;
		info[0].width = CEIVA_FLASH_WIDTH;
		info[1].base = CS1_PHYS_BASE;
		info[1].size = SZ_32M;
		info[1].width = CEIVA_FLASH_WIDTH;
		nr = 2;
	}
#endif
	return nr;
}

static struct mtd_partition *parsed_parts;
static const char *probes[] = { "cmdlinepart", "RedBoot", NULL };

static void __init clps_locate_partitions(struct mtd_info *mtd)
{
	const char *part_type = NULL;
	int nr_parts = 0;
	do {
		/*
		 * Partition selection stuff.
		 */
		nr_parts = parse_mtd_partitions(mtd, probes, &parsed_parts, 0);
		if (nr_parts > 0) {
			part_type = "command line";
			break;
		}
#ifdef CONFIG_MTD_CEIVA_STATICMAP
		nr_parts = clps_static_partitions(&parsed_parts);
		if (nr_parts > 0) {
			part_type = "static";
			break;
		}
		printk("found: %d partitions\n", nr_parts);
#endif
	} while (0);

	if (nr_parts == 0) {
		printk(KERN_NOTICE "clps flash: no partition info "
			"available, registering whole flash\n");
		add_mtd_device(mtd);
	} else {
		printk(KERN_NOTICE "clps flash: using %s partition "
			"definition\n", part_type);
		add_mtd_partitions(mtd, parsed_parts, nr_parts);
	}

	/* Always succeeds. */
}

static void __exit clps_destroy_partitions(void)
{
	if (parsed_parts)
		kfree(parsed_parts);
}

static struct mtd_info *mymtd;

static int __init clps_mtd_init(void)
{
	int ret;
	int nr;

	nr = clps_setup_flash();
	if (nr < 0)
		return nr;

	ret = clps_setup_mtd(info, nr, &mymtd);
	if (ret)
		return ret;

	clps_locate_partitions(mymtd);

	return 0;
}

static void __exit clps_mtd_cleanup(void)
{
	clps_destroy_mtd(info, mymtd);
	clps_destroy_partitions();
}

module_init(clps_mtd_init);
module_exit(clps_mtd_cleanup);

MODULE_AUTHOR("Rob Scott");
MODULE_DESCRIPTION("Cirrus Logic JEDEC map driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Ceiva flash memory driver.
	3	* Copyright (C) 2002 Rob Scott <rscott@mtrob.fdns.net>
	4	*
	5	* Note: this driver supports jedec compatible devices. Modification
	6	* for CFI compatible devices should be straight forward: change
	7	* jedec_probe to cfi_probe.
	8	*
	9	* Based on: sa1100-flash.c, which has the following copyright:
	10	* Flash memory access on SA11x0 based devices
	11	*
	12	* (C) 2000 Nicolas Pitre <nico@cam.org>
	13	*
	14	* $Id: ceiva.c,v 1.11 2004/09/16 23:27:12 gleixner Exp $
	15	*/
	16
	17	#include <linux/config.h>
	18	#include <linux/module.h>
	19	#include <linux/types.h>
	20	#include <linux/ioport.h>
	21	#include <linux/kernel.h>
	22	#include <linux/init.h>
4e57b681	23	#include <linux/slab.h>
1da177e4 LT	24
	25	#include <linux/mtd/mtd.h>
	26	#include <linux/mtd/map.h>
	27	#include <linux/mtd/partitions.h>
	28	#include <linux/mtd/concat.h>
	29
	30	#include <asm/hardware.h>
	31	#include <asm/mach-types.h>
	32	#include <asm/io.h>
	33	#include <asm/sizes.h>
	34
	35	/*
	36	* This isn't complete yet, so...
	37	*/
	38	#define CONFIG_MTD_CEIVA_STATICMAP
	39
	40	#ifdef CONFIG_MTD_CEIVA_STATICMAP
	41	/*
	42	* See include/linux/mtd/partitions.h for definition of the mtd_partition
	43	* structure.
	44	*
	45	* Please note:
	46	* 1. The flash size given should be the largest flash size that can
	47	* be accomodated.
	48	*
	49	* 2. The bus width must defined in clps_setup_flash.
	50	*
	51	* The MTD layer will detect flash chip aliasing and reduce the size of
	52	* the map accordingly.
	53	*
	54	*/
	55
	56	#ifdef CONFIG_ARCH_CEIVA
	57	/* Flash / Partition sizing */
	58	/* For the 28F8003, we use the block mapping to calcuate the sizes */
	59	#define MAX_SIZE_KiB (16 + 8 + 8 + 96 + (7*128))
	60	#define BOOT_PARTITION_SIZE_KiB (16)
	61	#define PARAMS_PARTITION_SIZE_KiB (8)
	62	#define KERNEL_PARTITION_SIZE_KiB (4*128)
	63	/* Use both remaing portion of first flash, and all of second flash */
	64	#define ROOT_PARTITION_SIZE_KiB (3128) + (8128)
	65
	66	static struct mtd_partition ceiva_partitions[] = {
	67	{
	68	.name = "Ceiva BOOT partition",
	69	.size = BOOT_PARTITION_SIZE_KiB*1024,
	70	.offset = 0,
	71
	72	},{
	73	.name = "Ceiva parameters partition",
	74	.size = PARAMS_PARTITION_SIZE_KiB*1024,
	75	.offset = (16 + 8) * 1024,
	76	},{
	77	.name = "Ceiva kernel partition",
	78	.size = (KERNEL_PARTITION_SIZE_KiB)*1024,
	79	.offset = 0x20000,
	80
	81	},{
	82	.name = "Ceiva root filesystem partition",
	83	.offset = MTDPART_OFS_APPEND,
	84	.size = (ROOT_PARTITION_SIZE_KiB)*1024,
	85	}
	86	};
	87	#endif
88
89	static int __init clps_static_partitions(struct mtd_partition **parts)
90	{
91	int nb_parts = 0;
92
93	#ifdef CONFIG_ARCH_CEIVA
94	if (machine_is_ceiva()) {
95	*parts = ceiva_partitions;
96	nb_parts = ARRAY_SIZE(ceiva_partitions);
97	}
98	#endif
99	return nb_parts;
100	}
101	#endif
102
103	struct clps_info {
104	unsigned long base;
105	unsigned long size;
106	int width;
107	void *vbase;
108	struct map_info *map;
109	struct mtd_info *mtd;
110	struct resource *res;
111	};
112
113	#define NR_SUBMTD 4
114
115	static struct clps_info info[NR_SUBMTD];
116
117	static int __init clps_setup_mtd(struct clps_info clps, int nr, struct mtd_info *rmtd)
118	{
119	struct mtd_info *subdev[nr];
120	struct map_info *maps;
121	int i, found = 0, ret = 0;
122
123	/*
124	* Allocate the map_info structs in one go.
125	*/
126	maps = kmalloc(sizeof(struct map_info) * nr, GFP_KERNEL);
127	if (!maps)
128	return -ENOMEM;
129	memset(maps, 0, sizeof(struct map_info) * nr);
130	/*
131	* Claim and then map the memory regions.
132	*/
133	for (i = 0; i < nr; i++) {
134	if (clps[i].base == (unsigned long)-1)
135	break;
136
137	clps[i].res = request_mem_region(clps[i].base, clps[i].size, "clps flash");
138	if (!clps[i].res) {
139	ret = -EBUSY;
140	break;
141	}
142
143	clps[i].map = maps + i;
144
145	clps[i].map->name = "clps flash";
146	clps[i].map->phys = clps[i].base;
147
148	clps[i].vbase = ioremap(clps[i].base, clps[i].size);
149	if (!clps[i].vbase) {
150	ret = -ENOMEM;
151	break;
152	}
153
154	clps[i].map->virt = (void __iomem *)clps[i].vbase;
155	clps[i].map->bankwidth = clps[i].width;
156	clps[i].map->size = clps[i].size;
157
158	simple_map_init(&clps[i].map);
159
160	clps[i].mtd = do_map_probe("jedec_probe", clps[i].map);
161	if (clps[i].mtd == NULL) {
162	ret = -ENXIO;
163	break;
164	}
165	clps[i].mtd->owner = THIS_MODULE;
166	subdev[i] = clps[i].mtd;
167
168	printk(KERN_INFO "clps flash: JEDEC device at 0x%08lx, %dMiB, "
169	"%d-bit\n", clps[i].base, clps[i].mtd->size >> 20,
170	clps[i].width * 8);
171	found += 1;
172	}
173
174	/*
175	* ENXIO is special. It means we didn't find a chip when
176	* we probed. We need to tear down the mapping, free the
177	* resource and mark it as such.
178	*/
179	if (ret == -ENXIO) {
180	iounmap(clps[i].vbase);
181	clps[i].vbase = NULL;
182	release_resource(clps[i].res);
183	clps[i].res = NULL;
184	}
185
186	/*
187	* If we found one device, don't bother with concat support.
188	* If we found multiple devices, use concat if we have it
189	* available, otherwise fail.
190	*/
191	if (ret == 0 \|\| ret == -ENXIO) {
192	if (found == 1) {
193	*rmtd = subdev[0];
194	ret = 0;
195	} else if (found > 1) {
196	/*
197	* We detected multiple devices. Concatenate
198	* them together.
199	*/
200	#ifdef CONFIG_MTD_CONCAT
201	*rmtd = mtd_concat_create(subdev, found,
202	"clps flash");
203	if (*rmtd == NULL)
204	ret = -ENXIO;
205	#else
206	printk(KERN_ERR "clps flash: multiple devices "
207	"found but MTD concat support disabled.\n");
208	ret = -ENXIO;
209	#endif
210	}
211	}
212
213	/*
214	* If we failed, clean up.
215	*/
216	if (ret) {
217	do {
218	if (clps[i].mtd)
219	map_destroy(clps[i].mtd);
220	if (clps[i].vbase)
221	iounmap(clps[i].vbase);
222	if (clps[i].res)
223	release_resource(clps[i].res);
224	} while (i--);
225
226	kfree(maps);
227	}
228
229	return ret;
230	}
231
232	static void __exit clps_destroy_mtd(struct clps_info clps, struct mtd_info mtd)
233	{
234	int i;
235
236	del_mtd_partitions(mtd);
237
238	if (mtd != clps[0].mtd)
239	mtd_concat_destroy(mtd);
240
241	for (i = NR_SUBMTD; i >= 0; i--) {
242	if (clps[i].mtd)
243	map_destroy(clps[i].mtd);
244	if (clps[i].vbase)
245	iounmap(clps[i].vbase);
246	if (clps[i].res)
247	release_resource(clps[i].res);
248	}
249	kfree(clps[0].map);
250	}
251
252	/*
253	* We define the memory space, size, and width for the flash memory
254	* space here.
255	*/
256
257	static int __init clps_setup_flash(void)
258	{
259	int nr;
260
261	#ifdef CONFIG_ARCH_CEIVA
262	if (machine_is_ceiva()) {
263	info[0].base = CS0_PHYS_BASE;
264	info[0].size = SZ_32M;
265	info[0].width = CEIVA_FLASH_WIDTH;
266	info[1].base = CS1_PHYS_BASE;
267	info[1].size = SZ_32M;
268	info[1].width = CEIVA_FLASH_WIDTH;
269	nr = 2;
270	}
271	#endif
272	return nr;
273	}
274
275	static struct mtd_partition *parsed_parts;
276	static const char *probes[] = { "cmdlinepart", "RedBoot", NULL };
277
278	static void __init clps_locate_partitions(struct mtd_info *mtd)
279	{
280	const char *part_type = NULL;
281	int nr_parts = 0;
282	do {
283	/*
284	* Partition selection stuff.
285	*/
286	nr_parts = parse_mtd_partitions(mtd, probes, &parsed_parts, 0);
287	if (nr_parts > 0) {
288	part_type = "command line";
289	break;
290	}
291	#ifdef CONFIG_MTD_CEIVA_STATICMAP
292	nr_parts = clps_static_partitions(&parsed_parts);
293	if (nr_parts > 0) {
294	part_type = "static";
295	break;
296	}
297	printk("found: %d partitions\n", nr_parts);
298	#endif
299	} while (0);
300
301	if (nr_parts == 0) {
302	printk(KERN_NOTICE "clps flash: no partition info "
303	"available, registering whole flash\n");
304	add_mtd_device(mtd);
305	} else {
306	printk(KERN_NOTICE "clps flash: using %s partition "
307	"definition\n", part_type);
308	add_mtd_partitions(mtd, parsed_parts, nr_parts);
309	}
310
311	/* Always succeeds. */
312	}
313
314	static void __exit clps_destroy_partitions(void)
315	{
316	if (parsed_parts)
317	kfree(parsed_parts);
318	}
319
320	static struct mtd_info *mymtd;
321
322	static int __init clps_mtd_init(void)
323	{
324	int ret;
325	int nr;
326
327	nr = clps_setup_flash();
328	if (nr < 0)
329	return nr;
330
331	ret = clps_setup_mtd(info, nr, &mymtd);
332	if (ret)
333	return ret;
334
335	clps_locate_partitions(mymtd);
336
337	return 0;
338	}
339
340	static void __exit clps_mtd_cleanup(void)
341	{
342	clps_destroy_mtd(info, mymtd);
343	clps_destroy_partitions();
344	}
345
346	module_init(clps_mtd_init);
347	module_exit(clps_mtd_cleanup);
348
349	MODULE_AUTHOR("Rob Scott");
350	MODULE_DESCRIPTION("Cirrus Logic JEDEC map driver");
351	MODULE_LICENSE("GPL");