mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 11:00:15 +00:00
500856eb17
This is an API for external (standalone) applications running on top of U-Boot, and is meant to be more extensible and robust than the existing jumptable mechanism. It is similar to UNIX syscall approach. See api/README for more details. Included is the demo application using this new framework (api_examples). Please note this is still an experimental feature, and is turned off by default. Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
370 lines
8.1 KiB
C
370 lines
8.1 KiB
C
/*
|
|
* (C) Copyright 2007 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>
|
|
|
|
#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_MAX 4
|
|
|
|
struct stor_spec {
|
|
int max_dev;
|
|
int enum_started;
|
|
int enum_ended;
|
|
int type; /* "external" type: DT_STOR_{IDE,USB,etc} */
|
|
char name[4];
|
|
};
|
|
|
|
static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, "" }, };
|
|
|
|
|
|
void dev_stor_init(void)
|
|
{
|
|
#if (CONFIG_COMMANDS & CFG_CMD_IDE)
|
|
specs[ENUM_IDE].max_dev = CFG_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 (CONFIG_COMMANDS & CFG_CMD_USB)
|
|
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
|
|
#if (CONFIG_COMMANDS & CFG_CMD_SCSI)
|
|
specs[ENUM_SCSI].max_dev = CFG_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
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
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);
|
|
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");
|
|
return 0;
|
|
}
|
|
|
|
return (dd->block_read(dev_stor_index(dd), start, len, buf));
|
|
}
|
|
|
|
#endif /* CONFIG_API */
|