mirror of
https://github.com/u-boot/u-boot.git
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406 lines
7.1 KiB
C
406 lines
7.1 KiB
C
/*
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* (C) Copyright 2007 Semihalf
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*
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* Written by: Rafal Jaworowski <raj@semihalf.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <linux/types.h>
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#include <api_public.h>
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#include "glue.h"
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static int valid_sig(struct api_signature *sig)
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{
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uint32_t checksum;
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struct api_signature s;
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if (sig == NULL)
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return 0;
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/*
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* Clear the checksum field (in the local copy) so as to calculate the
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* CRC with the same initial contents as at the time when the sig was
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* produced
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*/
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s = *sig;
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s.checksum = 0;
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checksum = crc32(0, (unsigned char *)&s, sizeof(struct api_signature));
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if (checksum != sig->checksum)
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return 0;
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return 1;
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}
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/*
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* Searches for the U-Boot API signature
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*
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* returns 1/0 depending on found/not found result
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*/
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int api_search_sig(struct api_signature **sig) {
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unsigned char *sp;
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if (sig == NULL)
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return 0;
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sp = (unsigned char *)API_SEARCH_START;
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while ((sp + (int)API_SIG_MAGLEN) < (unsigned char *)API_SEARCH_END) {
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if (!memcmp(sp, API_SIG_MAGIC, API_SIG_MAGLEN)) {
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*sig = (struct api_signature *)sp;
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if (valid_sig(*sig))
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return 1;
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}
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sp += API_SIG_MAGLEN;
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}
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*sig = NULL;
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return 0;
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}
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/****************************************
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*
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* console
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*
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****************************************/
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int ub_getc(void)
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{
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int c;
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if (!syscall(API_GETC, NULL, (uint32_t)&c))
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return -1;
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return c;
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}
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int ub_tstc(void)
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{
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int t;
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if (!syscall(API_TSTC, NULL, (uint32_t)&t))
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return -1;
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return t;
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}
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void ub_putc(char c)
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{
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syscall(API_PUTC, NULL, (uint32_t)&c);
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}
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void ub_puts(const char *s)
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{
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syscall(API_PUTS, NULL, (uint32_t)s);
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}
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/****************************************
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*
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* system
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*
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****************************************/
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void ub_reset(void)
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{
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syscall(API_RESET, NULL);
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}
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#define MR_MAX 5
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static struct mem_region mr[MR_MAX];
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static struct sys_info si;
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struct sys_info * ub_get_sys_info(void)
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{
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int err = 0;
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memset(&si, 0, sizeof(struct sys_info));
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si.mr = mr;
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si.mr_no = MR_MAX;
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memset(&mr, 0, sizeof(mr));
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if (!syscall(API_GET_SYS_INFO, &err, (u_int32_t)&si))
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return NULL;
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return ((err) ? NULL : &si);
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}
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/****************************************
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*
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* timing
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*
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****************************************/
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void ub_udelay(unsigned long usec)
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{
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syscall(API_UDELAY, NULL, &usec);
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}
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unsigned long ub_get_timer(unsigned long base)
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{
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unsigned long cur;
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if (!syscall(API_GET_TIMER, NULL, &cur, &base))
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return 0;
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return cur;
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}
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/****************************************************************************
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*
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* devices
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*
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* Devices are identified by handles: numbers 0, 1, 2, ..., MAX_DEVS-1
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*
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***************************************************************************/
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#define MAX_DEVS 6
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static struct device_info devices[MAX_DEVS];
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struct device_info * ub_dev_get(int i)
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{
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return ((i < 0 || i >= MAX_DEVS) ? NULL : &devices[i]);
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}
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/*
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* Enumerates the devices: fills out device_info elements in the devices[]
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* array.
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*
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* returns: number of devices found
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*/
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int ub_dev_enum(void)
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{
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struct device_info *di;
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int n = 0;
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memset(&devices, 0, sizeof(struct device_info) * MAX_DEVS);
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di = &devices[0];
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if (!syscall(API_DEV_ENUM, NULL, di))
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return 0;
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while (di->cookie != NULL) {
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if (++n >= MAX_DEVS)
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break;
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/* take another device_info */
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di++;
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/* pass on the previous cookie */
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di->cookie = devices[n - 1].cookie;
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if (!syscall(API_DEV_ENUM, NULL, di))
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return 0;
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}
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return n;
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}
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/*
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* handle: 0-based id of the device
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*
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* returns: 0 when OK, err otherwise
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*/
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int ub_dev_open(int handle)
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{
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struct device_info *di;
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int err = 0;
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if (handle < 0 || handle >= MAX_DEVS)
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return API_EINVAL;
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di = &devices[handle];
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if (!syscall(API_DEV_OPEN, &err, di))
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return -1;
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return err;
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}
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int ub_dev_close(int handle)
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{
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struct device_info *di;
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if (handle < 0 || handle >= MAX_DEVS)
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return API_EINVAL;
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di = &devices[handle];
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if (!syscall(API_DEV_CLOSE, NULL, di))
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return -1;
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return 0;
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}
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/*
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*
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* Validates device for read/write, it has to:
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*
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* - have sane handle
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* - be opened
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*
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* returns: 0/1 accordingly
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*/
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static int dev_valid(int handle)
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{
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if (handle < 0 || handle >= MAX_DEVS)
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return 0;
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if (devices[handle].state != DEV_STA_OPEN)
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return 0;
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return 1;
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}
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static int dev_stor_valid(int handle)
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{
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if (!dev_valid(handle))
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return 0;
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if (!(devices[handle].type & DEV_TYP_STOR))
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return 0;
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return 1;
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}
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int ub_dev_read(int handle, void *buf, lbasize_t len, lbastart_t start)
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{
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struct device_info *di;
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lbasize_t act_len;
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int err = 0;
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if (!dev_stor_valid(handle))
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return API_ENODEV;
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di = &devices[handle];
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if (!syscall(API_DEV_READ, &err, di, buf, &len, &start, &act_len))
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return -1;
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if (err)
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return err;
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if (act_len != len)
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return API_EIO;
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return 0;
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}
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static int dev_net_valid(int handle)
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{
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if (!dev_valid(handle))
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return 0;
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if (devices[handle].type != DEV_TYP_NET)
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return 0;
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return 1;
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}
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int ub_dev_recv(int handle, void *buf, int len)
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{
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struct device_info *di;
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int err = 0, act_len;
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if (!dev_net_valid(handle))
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return API_ENODEV;
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di = &devices[handle];
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if (!syscall(API_DEV_READ, &err, di, buf, &len, &act_len))
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return -1;
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if (err)
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return -1;
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return act_len;
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}
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int ub_dev_send(int handle, void *buf, int len)
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{
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struct device_info *di;
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int err = 0;
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if (!dev_net_valid(handle))
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return API_ENODEV;
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di = &devices[handle];
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if (!syscall(API_DEV_WRITE, &err, di, buf, &len))
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return -1;
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return err;
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}
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/****************************************
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*
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* env vars
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*
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****************************************/
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char * ub_env_get(const char *name)
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{
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char *value;
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if (!syscall(API_ENV_GET, NULL, (uint32_t)name, (uint32_t)&value))
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return NULL;
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return value;
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}
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void ub_env_set(const char *name, char *value)
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{
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syscall(API_ENV_SET, NULL, (uint32_t)name, (uint32_t)value);
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}
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static char env_name[256];
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const char * ub_env_enum(const char *last)
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{
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const char *env, *str;
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int i;
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env = NULL;
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/*
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* It's OK to pass only the name piece as last (and not the whole
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* 'name=val' string), since the API_ENUM_ENV call uses envmatch()
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* internally, which handles such case
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*/
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if (!syscall(API_ENV_ENUM, NULL, (uint32_t)last, (uint32_t)&env))
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return NULL;
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if (!env)
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/* no more env. variables to enumerate */
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return NULL;
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/* next enumerated env var */
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memset(env_name, 0, 256);
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for (i = 0, str = env; *str != '=' && *str != '\0';)
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env_name[i++] = *str++;
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env_name[i] = '\0';
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return env_name;
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}
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