u-boot/api_examples/glue.c

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/*
* (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 <common.h>
#include <linux/types.h>
#include <api_public.h>
#include "glue.h"
static int valid_sig(struct api_signature *sig)
{
uint32_t checksum;
struct api_signature s;
if (sig == NULL)
return 0;
/*
* Clear the checksum field (in the local copy) so as to calculate the
* CRC with the same initial contents as at the time when the sig was
* produced
*/
s = *sig;
s.checksum = 0;
checksum = crc32(0, (unsigned char *)&s, sizeof(struct api_signature));
if (checksum != sig->checksum)
return 0;
return 1;
}
/*
* Searches for the U-Boot API signature
*
* returns 1/0 depending on found/not found result
*/
int api_search_sig(struct api_signature **sig) {
unsigned char *sp;
if (sig == NULL)
return 0;
sp = (unsigned char *)API_SEARCH_START;
while ((sp + (int)API_SIG_MAGLEN) < (unsigned char *)API_SEARCH_END) {
if (!memcmp(sp, API_SIG_MAGIC, API_SIG_MAGLEN)) {
*sig = (struct api_signature *)sp;
if (valid_sig(*sig))
return 1;
}
sp += API_SIG_MAGLEN;
}
*sig = NULL;
return 0;
}
/****************************************
*
* console
*
****************************************/
int ub_getc(void)
{
int c;
if (!syscall(API_GETC, NULL, (uint32_t)&c))
return -1;
return c;
}
int ub_tstc(void)
{
int t;
if (!syscall(API_TSTC, NULL, (uint32_t)&t))
return -1;
return t;
}
void ub_putc(char c)
{
syscall(API_PUTC, NULL, (uint32_t)&c);
}
void ub_puts(const char *s)
{
syscall(API_PUTS, NULL, (uint32_t)s);
}
/****************************************
*
* system
*
****************************************/
void ub_reset(void)
{
syscall(API_RESET, NULL);
}
#define MR_MAX 5
static struct mem_region mr[MR_MAX];
static struct sys_info si;
struct sys_info * ub_get_sys_info(void)
{
int err = 0;
memset(&si, 0, sizeof(struct sys_info));
si.mr = mr;
si.mr_no = MR_MAX;
memset(&mr, 0, sizeof(mr));
if (!syscall(API_GET_SYS_INFO, &err, (u_int32_t)&si))
return NULL;
return ((err) ? NULL : &si);
}
/****************************************
*
* timing
*
****************************************/
void ub_udelay(unsigned long usec)
{
syscall(API_UDELAY, NULL, &usec);
}
unsigned long ub_get_timer(unsigned long base)
{
unsigned long cur;
if (!syscall(API_GET_TIMER, NULL, &cur, &base))
return 0;
return cur;
}
/****************************************************************************
*
* devices
*
* Devices are identified by handles: numbers 0, 1, 2, ..., MAX_DEVS-1
*
***************************************************************************/
#define MAX_DEVS 6
static struct device_info devices[MAX_DEVS];
struct device_info * ub_dev_get(int i)
{
return ((i < 0 || i >= MAX_DEVS) ? NULL : &devices[i]);
}
/*
* Enumerates the devices: fills out device_info elements in the devices[]
* array.
*
* returns: number of devices found
*/
int ub_dev_enum(void)
{
struct device_info *di;
int n = 0;
memset(&devices, 0, sizeof(struct device_info) * MAX_DEVS);
di = &devices[0];
if (!syscall(API_DEV_ENUM, NULL, di))
return 0;
while (di->cookie != NULL) {
if (++n >= MAX_DEVS)
break;
/* take another device_info */
di++;
/* pass on the previous cookie */
di->cookie = devices[n - 1].cookie;
if (!syscall(API_DEV_ENUM, NULL, di))
return 0;
}
return n;
}
/*
* handle: 0-based id of the device
*
* returns: 0 when OK, err otherwise
*/
int ub_dev_open(int handle)
{
struct device_info *di;
int err = 0;
if (handle < 0 || handle >= MAX_DEVS)
return API_EINVAL;
di = &devices[handle];
if (!syscall(API_DEV_OPEN, &err, di))
return -1;
return err;
}
int ub_dev_close(int handle)
{
struct device_info *di;
if (handle < 0 || handle >= MAX_DEVS)
return API_EINVAL;
di = &devices[handle];
if (!syscall(API_DEV_CLOSE, NULL, di))
return -1;
return 0;
}
/*
*
* Validates device for read/write, it has to:
*
* - have sane handle
* - be opened
*
* returns: 0/1 accordingly
*/
static int dev_valid(int handle)
{
if (handle < 0 || handle >= MAX_DEVS)
return 0;
if (devices[handle].state != DEV_STA_OPEN)
return 0;
return 1;
}
static int dev_stor_valid(int handle)
{
if (!dev_valid(handle))
return 0;
if (!(devices[handle].type & DEV_TYP_STOR))
return 0;
return 1;
}
int ub_dev_read(int handle, void *buf, lbasize_t len, lbastart_t start)
{
struct device_info *di;
lbasize_t act_len;
int err = 0;
if (!dev_stor_valid(handle))
return API_ENODEV;
di = &devices[handle];
if (!syscall(API_DEV_READ, &err, di, buf, &len, &start, &act_len))
return -1;
if (err)
return err;
if (act_len != len)
return API_EIO;
return 0;
}
static int dev_net_valid(int handle)
{
if (!dev_valid(handle))
return 0;
if (devices[handle].type != DEV_TYP_NET)
return 0;
return 1;
}
int ub_dev_recv(int handle, void *buf, int len)
{
struct device_info *di;
int err = 0, act_len;
if (!dev_net_valid(handle))
return API_ENODEV;
di = &devices[handle];
if (!syscall(API_DEV_READ, &err, di, buf, &len, &act_len))
return -1;
if (err)
return -1;
return act_len;
}
int ub_dev_send(int handle, void *buf, int len)
{
struct device_info *di;
int err = 0;
if (!dev_net_valid(handle))
return API_ENODEV;
di = &devices[handle];
if (!syscall(API_DEV_WRITE, &err, di, buf, &len))
return -1;
return err;
}
/****************************************
*
* env vars
*
****************************************/
char * ub_env_get(const char *name)
{
char *value;
if (!syscall(API_ENV_GET, NULL, (uint32_t)name, (uint32_t)&value))
return NULL;
return value;
}
void ub_env_set(const char *name, char *value)
{
syscall(API_ENV_SET, NULL, (uint32_t)name, (uint32_t)value);
}
static char env_name[256];
const char * ub_env_enum(const char *last)
{
const char *env, *str;
int i;
env = NULL;
/*
* It's OK to pass only the name piece as last (and not the whole
* 'name=val' string), since the API_ENUM_ENV call uses envmatch()
* internally, which handles such case
*/
if (!syscall(API_ENV_ENUM, NULL, (uint32_t)last, (uint32_t)&env))
return NULL;
if (!env)
/* no more env. variables to enumerate */
return NULL;
/* next enumerated env var */
memset(env_name, 0, 256);
for (i = 0, str = env; *str != '=' && *str != '\0';)
env_name[i++] = *str++;
env_name[i] = '\0';
return env_name;
}