[people/ms/u-boot.git] / api / api_storage.c

/*
 * (C) Copyright 2007-2008 Semihalf
 *
 * Written by: Rafal Jaworowski <raj@semihalf.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

#include <config.h>

#if defined(CONFIG_API)

#include <common.h>
#include <api_public.h>

#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
#include <usb.h>
#endif

#define DEBUG
#undef DEBUG

#ifdef DEBUG
#define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
#else
#define debugf(fmt, args...)
#endif

#define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0)


#define ENUM_IDE	0
#define ENUM_USB	1
#define ENUM_SCSI	2
#define ENUM_MMC	3
#define ENUM_SATA	4
#define ENUM_MAX	5

struct stor_spec {
	int		max_dev;
	int		enum_started;
	int		enum_ended;
	int		type;		/* "external" type: DT_STOR_{IDE,USB,etc} */
	char		*name;
};

static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, "" }, };


void dev_stor_init(void)
{
#if defined(CONFIG_CMD_IDE)
	specs[ENUM_IDE].max_dev = CONFIG_SYS_IDE_MAXDEVICE;
	specs[ENUM_IDE].enum_started = 0;
	specs[ENUM_IDE].enum_ended = 0;
	specs[ENUM_IDE].type = DEV_TYP_STOR | DT_STOR_IDE;
	specs[ENUM_IDE].name = "ide";
#endif
#if defined(CONFIG_CMD_MMC)
	specs[ENUM_MMC].max_dev = CONFIG_SYS_MMC_MAX_DEVICE;
	specs[ENUM_MMC].enum_started = 0;
	specs[ENUM_MMC].enum_ended = 0;
	specs[ENUM_MMC].type = DEV_TYP_STOR | DT_STOR_MMC;
	specs[ENUM_MMC].name = "mmc";
#endif
#if defined(CONFIG_CMD_SATA)
	specs[ENUM_SATA].max_dev = CONFIG_SYS_SATA_MAX_DEVICE;
	specs[ENUM_SATA].enum_started = 0;
	specs[ENUM_SATA].enum_ended = 0;
	specs[ENUM_SATA].type = DEV_TYP_STOR | DT_STOR_SATA;
	specs[ENUM_SATA].name = "sata";
#endif
#if defined(CONFIG_CMD_SCSI)
	specs[ENUM_SCSI].max_dev = CONFIG_SYS_SCSI_MAX_DEVICE;
	specs[ENUM_SCSI].enum_started = 0;
	specs[ENUM_SCSI].enum_ended = 0;
	specs[ENUM_SCSI].type = DEV_TYP_STOR | DT_STOR_SCSI;
	specs[ENUM_SCSI].name = "scsi";
#endif
#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
	specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV;
	specs[ENUM_USB].enum_started = 0;
	specs[ENUM_USB].enum_ended = 0;
	specs[ENUM_USB].type = DEV_TYP_STOR | DT_STOR_USB;
	specs[ENUM_USB].name = "usb";
#endif
}

/*
 * Finds next available device in the storage group
 *
 * type:	storage group type - ENUM_IDE, ENUM_SCSI etc.
 *
 * first:	if 1 the first device in the storage group is returned (if
 *              exists), if 0 the next available device is searched
 *
 * more:	returns 0/1 depending if there are more devices in this group
 *		available (for future iterations)
 *
 * returns:	0/1 depending if device found in this iteration
 */
static int dev_stor_get(int type, int first, int *more, struct device_info *di)
{
	int found = 0;
	*more = 0;

	int i;

	block_dev_desc_t *dd;

	if (first) {
		di->cookie = (void *)get_dev(specs[type].name, 0);
		if (di->cookie == NULL)
			return 0;
		else
			found = 1;

	} else {
		for (i = 0; i < specs[type].max_dev; i++)
			if (di->cookie == (void *)get_dev(specs[type].name, i)) {
				/* previous cookie found -- advance to the
				 * next device, if possible */

				if (++i >= specs[type].max_dev) {
					/* out of range, no more to enum */
					di->cookie = NULL;
					break;
				}

				di->cookie = (void *)get_dev(specs[type].name, i);
				if (di->cookie == NULL)
					return 0;
				else
					found = 1;

				/* provide hint if there are more devices in
				 * this group to enumerate */
				if ((i + 1) < specs[type].max_dev)
					*more = 1;

				break;
			}
	}

	if (found) {
		di->type = specs[type].type;

		if (di->cookie != NULL) {
			dd = (block_dev_desc_t *)di->cookie;
			if (dd->type == DEV_TYPE_UNKNOWN) {
				debugf("device instance exists, but is not active..");
				found = 0;
			} else {
				di->di_stor.block_count = dd->lba;
				di->di_stor.block_size = dd->blksz;
			}
		}

	} else
		di->cookie = NULL;

	return found;
}


/*
 * returns:	ENUM_IDE, ENUM_USB etc. based on block_dev_desc_t
 */
static int dev_stor_type(block_dev_desc_t *dd)
{
	int i, j;

	for (i = ENUM_IDE; i < ENUM_MAX; i++)
		for (j = 0; j < specs[i].max_dev; j++)
			if (dd == get_dev(specs[i].name, j))
				return i;

	return ENUM_MAX;
}


/*
 * returns:	0/1 whether cookie points to some device in this group
 */
static int dev_is_stor(int type, struct device_info *di)
{
	return (dev_stor_type(di->cookie) == type) ? 1 : 0;
}


static int dev_enum_stor(int type, struct device_info *di)
{
	int found = 0, more = 0;

	debugf("called, type %d\n", type);

	/*
	 * Formulae for enumerating storage devices:
	 * 1. if cookie (hint from previous enum call) is NULL we start again
	 *    with enumeration, so return the first available device, done.
	 *
	 * 2. if cookie is not NULL, check if it identifies some device in
	 *    this group:
	 *
	 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
	 *     return next available (if exists) in this group
	 *
	 * 2b. if it isn't device from our group, check if such devices were
	 *     ever enumerated before:
	 *     - if not, return the first available device from this group
	 *     - else return 0
	 */

	if (di->cookie == NULL) {

		debugf("group%d - enum restart\n", type);

		/*
		 * 1. Enumeration (re-)started: take the first available
		 * device, if exists
		 */
		found = dev_stor_get(type, 1, &more, di);
		specs[type].enum_started = 1;

	} else if (dev_is_stor(type, di)) {

		debugf("group%d - enum continued for the next device\n", type);

		if (specs[type].enum_ended) {
			debugf("group%d - nothing more to enum!\n", type);
			return 0;
		}

		/* 2a. Attempt to take a next available device in the group */
		found = dev_stor_get(type, 0, &more, di);

	} else {

		if (specs[type].enum_ended) {
			debugf("group %d - already enumerated, skipping\n", type);
			return 0;
		}

		debugf("group%d - first time enum\n", type);

		if (specs[type].enum_started == 0) {
			/*
			 * 2b.  If enumerating devices in this group did not
			 * happen before, it means the cookie pointed to a
			 * device frome some other group (another storage
			 * group, or network); in this case try to take the
			 * first available device from our group
			 */
			specs[type].enum_started = 1;

			/*
			 * Attempt to take the first device in this group:
			 *'first element' flag is set
			 */
			found = dev_stor_get(type, 1, &more, di);

		} else {
			errf("group%d - out of order iteration\n", type);
			found = 0;
			more = 0;
		}
	}

	/*
	 * If there are no more devices in this group, consider its
	 * enumeration finished
	 */
	specs[type].enum_ended = (!more) ? 1 : 0;

	if (found)
		debugf("device found, returning cookie 0x%08x\n",
			(u_int32_t)di->cookie);
	else
		debugf("no device found\n");

	return found;
}

void dev_enum_reset(void)
{
	int i;

	for (i = 0; i < ENUM_MAX; i ++) {
		specs[i].enum_started = 0;
		specs[i].enum_ended = 0;
	}
}

int dev_enum_storage(struct device_info *di)
{
	int i;

	/*
	 * check: ide, usb, scsi, mmc
	 */
	for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
		if (dev_enum_stor(i, di))
			return 1;
	}

	return 0;
}

static int dev_stor_is_valid(int type, block_dev_desc_t *dd)
{
	int i;

	for (i = 0; i < specs[type].max_dev; i++)
		if (dd == get_dev(specs[type].name, i))
			if (dd->type != DEV_TYPE_UNKNOWN)
				return 1;

	return 0;
}


int dev_open_stor(void *cookie)
{
	int type = dev_stor_type(cookie);

	if (type == ENUM_MAX)
		return API_ENODEV;

	if (dev_stor_is_valid(type, (block_dev_desc_t *)cookie))
		return 0;

	return API_ENODEV;
}


int dev_close_stor(void *cookie)
{
	/*
	 * Not much to do as we actually do not alter storage devices upon
	 * close
	 */
	return 0;
}


static int dev_stor_index(block_dev_desc_t *dd)
{
	int i, type;

	type = dev_stor_type(dd);
	for (i = 0; i < specs[type].max_dev; i++)
		if (dd == get_dev(specs[type].name, i))
			return i;

	return (specs[type].max_dev);
}


lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
{
	int type;
	block_dev_desc_t *dd = (block_dev_desc_t *)cookie;

	if ((type = dev_stor_type(dd)) == ENUM_MAX)
		return 0;

	if (!dev_stor_is_valid(type, dd))
		return 0;

	if ((dd->block_read) == NULL) {
		debugf("no block_read() for device 0x%08x\n", cookie);
		return 0;
	}

	return (dd->block_read(dev_stor_index(dd), start, len, buf));
}

#endif /* CONFIG_API */
Commit	Line	Data
500856eb	1	/*
f2302d44	2	* (C) Copyright 2007-2008 Semihalf
500856eb RJ	3	*
	4	* Written by: Rafal Jaworowski <raj@semihalf.com>
	5	*
	6	* See file CREDITS for list of people who contributed to this
	7	* project.
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License as
	11	* published by the Free Software Foundation; either version 2 of
	12	* the License, or (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	22	* MA 02111-1307 USA
	23	*
	24	*/
	25
	26	#include <config.h>
	27
	28	#if defined(CONFIG_API)
	29
	30	#include <common.h>
	31	#include <api_public.h>
	32
3d0ea311 MF	33	#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
	34	#include <usb.h>
	35	#endif
	36
500856eb RJ	37	#define DEBUG
	38	#undef DEBUG
	39
	40	#ifdef DEBUG
	41	#define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
	42	#else
	43	#define debugf(fmt, args...)
	44	#endif
	45
	46	#define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0)
	47
	48
	49	#define ENUM_IDE 0
	50	#define ENUM_USB 1
	51	#define ENUM_SCSI 2
	52	#define ENUM_MMC 3
f2302d44 SR	53	#define ENUM_SATA 4
f2302d44 SR	54	#define ENUM_MAX 5
500856eb RJ	55
	56	struct stor_spec {
	57	int max_dev;
	58	int enum_started;
	59	int enum_ended;
	60	int type; /* "external" type: DT_STOR_{IDE,USB,etc} */
f2302d44	61	char *name;
500856eb RJ	62	};
	63
	64	static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, "" }, };
	65
	66
	67	void dev_stor_init(void)
	68	{
1b769881	69	#if defined(CONFIG_CMD_IDE)
6d0f6bcf	70	specs[ENUM_IDE].max_dev = CONFIG_SYS_IDE_MAXDEVICE;
500856eb RJ	71	specs[ENUM_IDE].enum_started = 0;
	72	specs[ENUM_IDE].enum_ended = 0;
	73	specs[ENUM_IDE].type = DEV_TYP_STOR \| DT_STOR_IDE;
	74	specs[ENUM_IDE].name = "ide";
	75	#endif
f2302d44	76	#if defined(CONFIG_CMD_MMC)
6d0f6bcf	77	specs[ENUM_MMC].max_dev = CONFIG_SYS_MMC_MAX_DEVICE;
f2302d44 SR	78	specs[ENUM_MMC].enum_started = 0;
	79	specs[ENUM_MMC].enum_ended = 0;
	80	specs[ENUM_MMC].type = DEV_TYP_STOR \| DT_STOR_MMC;
	81	specs[ENUM_MMC].name = "mmc";
	82	#endif
	83	#if defined(CONFIG_CMD_SATA)
6d0f6bcf	84	specs[ENUM_SATA].max_dev = CONFIG_SYS_SATA_MAX_DEVICE;
f2302d44 SR	85	specs[ENUM_SATA].enum_started = 0;
	86	specs[ENUM_SATA].enum_ended = 0;
	87	specs[ENUM_SATA].type = DEV_TYP_STOR \| DT_STOR_SATA;
	88	specs[ENUM_SATA].name = "sata";
500856eb	89	#endif
1b769881	90	#if defined(CONFIG_CMD_SCSI)
6d0f6bcf	91	specs[ENUM_SCSI].max_dev = CONFIG_SYS_SCSI_MAX_DEVICE;
500856eb RJ	92	specs[ENUM_SCSI].enum_started = 0;
	93	specs[ENUM_SCSI].enum_ended = 0;
	94	specs[ENUM_SCSI].type = DEV_TYP_STOR \| DT_STOR_SCSI;
	95	specs[ENUM_SCSI].name = "scsi";
	96	#endif
f2302d44 SR	97	#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
	98	specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV;
	99	specs[ENUM_USB].enum_started = 0;
	100	specs[ENUM_USB].enum_ended = 0;
	101	specs[ENUM_USB].type = DEV_TYP_STOR \| DT_STOR_USB;
	102	specs[ENUM_USB].name = "usb";
	103	#endif
500856eb RJ	104	}
	105
	106	/*
	107	* Finds next available device in the storage group
	108	*
	109	* type: storage group type - ENUM_IDE, ENUM_SCSI etc.
	110	*
	111	* first: if 1 the first device in the storage group is returned (if
	112	* exists), if 0 the next available device is searched
	113	*
	114	* more: returns 0/1 depending if there are more devices in this group
	115	* available (for future iterations)
	116	*
	117	* returns: 0/1 depending if device found in this iteration
	118	*/
	119	static int dev_stor_get(int type, int first, int more, struct device_info di)
	120	{
	121	int found = 0;
	122	*more = 0;
	123
	124	int i;
	125
	126	block_dev_desc_t *dd;
	127
	128	if (first) {
	129	di->cookie = (void *)get_dev(specs[type].name, 0);
f2302d44 SR	130	if (di->cookie == NULL)
	131	return 0;
	132	else
	133	found = 1;
500856eb RJ	134
	135	} else {
	136	for (i = 0; i < specs[type].max_dev; i++)
	137	if (di->cookie == (void *)get_dev(specs[type].name, i)) {
	138	/* previous cookie found -- advance to the
	139	* next device, if possible */
	140
	141	if (++i >= specs[type].max_dev) {
	142	/* out of range, no more to enum */
	143	di->cookie = NULL;
	144	break;
	145	}
	146
	147	di->cookie = (void *)get_dev(specs[type].name, i);
f2302d44 SR	148	if (di->cookie == NULL)
	149	return 0;
	150	else
	151	found = 1;
500856eb RJ	152
	153	/* provide hint if there are more devices in
	154	* this group to enumerate */
	155	if ((i + 1) < specs[type].max_dev)
	156	*more = 1;
	157
	158	break;
	159	}
	160	}
	161
	162	if (found) {
	163	di->type = specs[type].type;
	164
	165	if (di->cookie != NULL) {
	166	dd = (block_dev_desc_t *)di->cookie;
	167	if (dd->type == DEV_TYPE_UNKNOWN) {
	168	debugf("device instance exists, but is not active..");
	169	found = 0;
	170	} else {
	171	di->di_stor.block_count = dd->lba;
	172	di->di_stor.block_size = dd->blksz;
	173	}
	174	}
	175
	176	} else
	177	di->cookie = NULL;
	178
	179	return found;
	180	}
	181
	182
	183	/*
	184	* returns: ENUM_IDE, ENUM_USB etc. based on block_dev_desc_t
	185	*/
	186	static int dev_stor_type(block_dev_desc_t *dd)
	187	{
	188	int i, j;
	189
	190	for (i = ENUM_IDE; i < ENUM_MAX; i++)
	191	for (j = 0; j < specs[i].max_dev; j++)
	192	if (dd == get_dev(specs[i].name, j))
	193	return i;
	194
	195	return ENUM_MAX;
	196	}
	197
	198
	199	/*
	200	* returns: 0/1 whether cookie points to some device in this group
	201	*/
	202	static int dev_is_stor(int type, struct device_info *di)
	203	{
	204	return (dev_stor_type(di->cookie) == type) ? 1 : 0;
	205	}
	206
	207
	208	static int dev_enum_stor(int type, struct device_info *di)
	209	{
	210	int found = 0, more = 0;
	211
	212	debugf("called, type %d\n", type);
	213
	214	/*
	215	* Formulae for enumerating storage devices:
216	* 1. if cookie (hint from previous enum call) is NULL we start again
217	* with enumeration, so return the first available device, done.
218	*
219	* 2. if cookie is not NULL, check if it identifies some device in
220	* this group:
221	*
222	* 2a. if cookie is a storage device from our group (IDE, USB etc.),
223	* return next available (if exists) in this group
224	*
225	* 2b. if it isn't device from our group, check if such devices were
226	* ever enumerated before:
227	* - if not, return the first available device from this group
228	* - else return 0
229	*/
230
231	if (di->cookie == NULL) {
232
233	debugf("group%d - enum restart\n", type);
234
235	/*
236	* 1. Enumeration (re-)started: take the first available
237	* device, if exists
238	*/
239	found = dev_stor_get(type, 1, &more, di);
240	specs[type].enum_started = 1;
241
242	} else if (dev_is_stor(type, di)) {
243
244	debugf("group%d - enum continued for the next device\n", type);
245
246	if (specs[type].enum_ended) {
247	debugf("group%d - nothing more to enum!\n", type);
248	return 0;
249	}
250
251	/* 2a. Attempt to take a next available device in the group */
252	found = dev_stor_get(type, 0, &more, di);
253
254	} else {
255
256	if (specs[type].enum_ended) {
257	debugf("group %d - already enumerated, skipping\n", type);
258	return 0;
259	}
260
261	debugf("group%d - first time enum\n", type);
262
263	if (specs[type].enum_started == 0) {
264	/*
265	* 2b. If enumerating devices in this group did not
266	* happen before, it means the cookie pointed to a
267	* device frome some other group (another storage
268	* group, or network); in this case try to take the
269	* first available device from our group
270	*/
271	specs[type].enum_started = 1;
272
273	/*
274	* Attempt to take the first device in this group:
275	*'first element' flag is set
276	*/
277	found = dev_stor_get(type, 1, &more, di);
278
279	} else {
280	errf("group%d - out of order iteration\n", type);
281	found = 0;
282	more = 0;
283	}
284	}
285
286	/*
287	* If there are no more devices in this group, consider its
288	* enumeration finished
289	*/
290	specs[type].enum_ended = (!more) ? 1 : 0;
291
292	if (found)
293	debugf("device found, returning cookie 0x%08x\n",
294	(u_int32_t)di->cookie);
295	else
296	debugf("no device found\n");
297
298	return found;
299	}
300
301	void dev_enum_reset(void)
302	{
303	int i;
304
305	for (i = 0; i < ENUM_MAX; i ++) {
306	specs[i].enum_started = 0;
307	specs[i].enum_ended = 0;
308	}
309	}
310
311	int dev_enum_storage(struct device_info *di)
312	{
313	int i;
314
315	/*
316	* check: ide, usb, scsi, mmc
317	*/
318	for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
319	if (dev_enum_stor(i, di))
320	return 1;
321	}
322
323	return 0;
324	}
325
326	static int dev_stor_is_valid(int type, block_dev_desc_t *dd)
327	{
328	int i;
329
330	for (i = 0; i < specs[type].max_dev; i++)
331	if (dd == get_dev(specs[type].name, i))
332	if (dd->type != DEV_TYPE_UNKNOWN)
333	return 1;
334
335	return 0;
336	}
337
338
339	int dev_open_stor(void *cookie)
340	{
341	int type = dev_stor_type(cookie);
342
343	if (type == ENUM_MAX)
344	return API_ENODEV;
345
346	if (dev_stor_is_valid(type, (block_dev_desc_t *)cookie))
347	return 0;
348
349	return API_ENODEV;
350	}
351
352
353	int dev_close_stor(void *cookie)
354	{
355	/*
356	* Not much to do as we actually do not alter storage devices upon
357	* close
358	*/
359	return 0;
360	}
361
362
363	static int dev_stor_index(block_dev_desc_t *dd)
364	{
365	int i, type;
366
367	type = dev_stor_type(dd);
368	for (i = 0; i < specs[type].max_dev; i++)
369	if (dd == get_dev(specs[type].name, i))
370	return i;
371
372	return (specs[type].max_dev);
373	}
374
375
376	lbasize_t dev_read_stor(void cookie, void buf, lbasize_t len, lbastart_t start)
377	{
378	int type;
379	block_dev_desc_t dd = (block_dev_desc_t )cookie;
380
381	if ((type = dev_stor_type(dd)) == ENUM_MAX)
382	return 0;
383
384	if (!dev_stor_is_valid(type, dd))
385	return 0;
386
387	if ((dd->block_read) == NULL) {
f2302d44	388	debugf("no block_read() for device 0x%08x\n", cookie);
500856eb RJ	389	return 0;
	390	}
	391
	392	return (dd->block_read(dev_stor_index(dd), start, len, buf));
	393	}
	394
	395	#endif /* CONFIG_API */