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/* u-boot driver for the GTA04 LEDs and Buttons
*
* Copyright (C) 2010 by Golden Delicious Computers GmbH&Co. KG
* Author: H. Nikolaus Schaller <hns@goldelico.com>
* 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <common.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/arch/mux.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/gpio.h>
#include <asm/mach-types.h>
#include <ns16550.h>
#include <twl4030.h>
#include "gps.h"
#ifdef CONFIG_OMAP3_GTA04
#define GPIO_GPSEXT 144 // external GPS antenna plugged in
#define GPIO_GPS_ON 145 // reset for GPS module
#else /* Beagle Hybrid */
#define GPIO_GPSEXT 138 // external GPS antenna plugged in
#define GPIO_GPS_ON 156
#endif
int gps_init(void)
{
extern int get_board_revision(void);
#define REVISION_XM 0
if(get_board_revision() == REVISION_XM) {
/* Set VAUX1 to 3.3V for GTA04E display board */
twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX1_DEDICATED,
/*TWL4030_PM_RECEIVER_VAUX1_VSEL_33*/ 0x07,
TWL4030_PM_RECEIVER_VAUX1_DEV_GRP,
TWL4030_PM_RECEIVER_DEV_GRP_P1);
udelay(5000);
}
#ifdef CONFIG_OMAP3_GTA04
/* ext. GPS Ant VSIM = 2.8 V (3.0V) */
twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VSIM_DEDICATED,
/*TWL4030_PM_RECEIVER_VSIM_VSEL_28*/ 0x04 /* 0x05 */,
TWL4030_PM_RECEIVER_VSIM_DEV_GRP,
TWL4030_PM_RECEIVER_DEV_GRP_P1);
udelay(5000);
#endif
omap_request_gpio(GPIO_GPS_ON);
omap_set_gpio_direction(GPIO_GPS_ON, 0); // output
omap_request_gpio(GPIO_GPSEXT);
omap_set_gpio_direction(GPIO_GPSEXT, 1); // input
return 0;
}
void gps_on(void)
{
omap_set_gpio_dataout(GPIO_GPS_ON, 1);
if(omap_get_gpio_datain(GPIO_GPSEXT))
printf("external antenna\n");
else
printf("internal antenna\n");
}
void gps_off(void)
{
omap_set_gpio_dataout(GPIO_GPS_ON, 0);
}
static int lastant=-1;
static long timer;
#define TIMEOUT 2 // in seconds
void gps_echo(void)
{
#define MODE_X_DIV 16
int baudrate=9600;
int divisor=(CONFIG_SYS_NS16550_CLK + (baudrate * (MODE_X_DIV / 2))) / (MODE_X_DIV * baudrate);
NS16550_reinit((NS16550_t)CONFIG_SYS_NS16550_COM2, divisor); // initialize UART
while (1)
{ // echo in both directions
int ant=omap_get_gpio_datain(GPIO_GPSEXT);
if(ant != lastant)
{ // changed
if(ant)
printf("external antenna\n");
else
printf("internal antenna\n");
lastant=ant;
}
if(NS16550_tstc((NS16550_t)CONFIG_SYS_NS16550_COM2))
{
putc(NS16550_getc((NS16550_t)CONFIG_SYS_NS16550_COM2)); // from GPS to console
timer=0; // data received
}
if(tstc())
{
int c=getc();
if(c == 0x03) // ctrl-C
break;
// NS16550_putc((NS16550_t)CONFIG_SYS_NS16550_COM2, c);
break;
}
if(timer++ > 2*10000)
{ // timeout - try to wakeup/reset the chip
printf("no data: on-off impulse\n");
omap_set_gpio_dataout(GPIO_GPS_ON, 1);
udelay(5000);
omap_set_gpio_dataout(GPIO_GPS_ON, 1);
timer=0;
}
udelay(100); // 10 kHz @ 9 kbit/s
}
printf("\n");
}
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