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/* Serial console layer, layered on top of sercomm HDLC */
/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdint.h>
#include <errno.h>
#include <string.h>
#include <asm/system.h>
#include <uart.h>
#include <console.h>
#include <osmocom/core/msgb.h>
#include <comm/sercomm.h>
#include <comm/sercomm_cons.h>
static struct {
struct msgb *cur_msg;
} scons;
static void raw_puts(const char *s)
{
int i = strlen(s);
while (i--)
uart_putchar_wait(SERCOMM_UART_NR, *s++);
}
#ifdef DEBUG
#define raw_putd(x) raw_puts(x)
#else
#define raw_putd(x)
#endif
int sercomm_puts(const char *s)
{
unsigned long flags;
const int len = strlen(s);
unsigned int bytes_left = len;
if (!sercomm_initialized()) {
raw_putd("sercomm not initialized: ");
raw_puts(s);
return len - 1;
}
/* This function is called from any context: Supervisor, IRQ, FIQ, ...
* as such, we need to ensure re-entrant calls are either supported or
* avoided. */
local_irq_save(flags);
local_fiq_disable();
while (bytes_left > 0) {
unsigned int write_num, space_left, flush;
uint8_t *data;
if (!scons.cur_msg)
scons.cur_msg = sercomm_alloc_msgb(SERCOMM_CONS_ALLOC);
if (!scons.cur_msg) {
raw_putd("cannot allocate sercomm msgb: ");
raw_puts(s);
return -ENOMEM;
}
/* space left in the current msgb */
space_left = msgb_tailroom(scons.cur_msg);
if (space_left <= bytes_left) {
write_num = space_left;
/* flush buffer when it is full */
flush = 1;
} else {
write_num = bytes_left;
flush = 0;
}
/* obtain pointer where to copy the data */
data = msgb_put(scons.cur_msg, write_num);
/* copy data while looking for \n line termination */
{
unsigned int i;
for (i = 0; i < write_num; i++) {
/* flush buffer at end of line, but skip
* flushing if we have a backlog in order to
* increase efficiency of msgb filling */
if (*s == '\n' &&
sercomm_tx_queue_depth(SC_DLCI_CONSOLE) < 4)
flush = 1;
*data++ = *s++;
}
}
bytes_left -= write_num;
if (flush) {
sercomm_sendmsg(SC_DLCI_CONSOLE, scons.cur_msg);
/* reset scons.cur_msg pointer to ensure we allocate
* a new one next round */
scons.cur_msg = NULL;
}
}
local_irq_restore(flags);
return len - 1;
}
int sercomm_putchar(int c)
{
char s[2];
int rc;
s[0] = c & 0xff;
s[1] = '\0';
rc = sercomm_puts(s);
if (rc < 0)
return rc;
return c;
}
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