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u-boot/drivers/serial/serial.c
Albert Aribaud 83142c112d Add Orion5x support to 16550 device driver 
This patch provides access to the 16550-compatible
serial device of the Orion5x SoC.

Signed-off-by: Albert Aribaud <albert.aribaud@free.fr>
2010-06-17 19:37:01 +05:30

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/*
* (C) Copyright 2000
* Rob Taylor, Flying Pig Systems. robt@flyingpig.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 <ns16550.h>
#ifdef CONFIG_NS87308
#include <ns87308.h>
#endif
#ifdef CONFIG_KIRKWOOD
#include <asm/arch/kirkwood.h>
#endif
#ifdef CONFIG_ORION5X
#include <asm/arch/orion5x.h>
#endif
#if defined (CONFIG_SERIAL_MULTI)
#include <serial.h>
#endif
DECLARE_GLOBAL_DATA_PTR;
#if !defined(CONFIG_CONS_INDEX)
#if defined (CONFIG_SERIAL_MULTI)
/* with CONFIG_SERIAL_MULTI we might have no console
* on these devices
*/
#else
#error "No console index specified."
#endif /* CONFIG_SERIAL_MULTI */
#elif (CONFIG_CONS_INDEX < 1) || (CONFIG_CONS_INDEX > 4)
#error "Invalid console index value."
#endif
#if CONFIG_CONS_INDEX == 1 && !defined(CONFIG_SYS_NS16550_COM1)
#error "Console port 1 defined but not configured."
#elif CONFIG_CONS_INDEX == 2 && !defined(CONFIG_SYS_NS16550_COM2)
#error "Console port 2 defined but not configured."
#elif CONFIG_CONS_INDEX == 3 && !defined(CONFIG_SYS_NS16550_COM3)
#error "Console port 3 defined but not configured."
#elif CONFIG_CONS_INDEX == 4 && !defined(CONFIG_SYS_NS16550_COM4)
#error "Console port 4 defined but not configured."
#endif
/* Note: The port number specified in the functions is 1 based.
* the array is 0 based.
*/
static NS16550_t serial_ports[4] = {
#ifdef CONFIG_SYS_NS16550_COM1
(NS16550_t)CONFIG_SYS_NS16550_COM1,
#else
NULL,
#endif
#ifdef CONFIG_SYS_NS16550_COM2
(NS16550_t)CONFIG_SYS_NS16550_COM2,
#else
NULL,
#endif
#ifdef CONFIG_SYS_NS16550_COM3
(NS16550_t)CONFIG_SYS_NS16550_COM3,
#else
NULL,
#endif
#ifdef CONFIG_SYS_NS16550_COM4
(NS16550_t)CONFIG_SYS_NS16550_COM4
#else
NULL
#endif
};
#define PORT serial_ports[port-1]
#if defined(CONFIG_CONS_INDEX)
#define CONSOLE (serial_ports[CONFIG_CONS_INDEX-1])
#endif
#if defined(CONFIG_SERIAL_MULTI)
/* Multi serial device functions */
#define DECLARE_ESERIAL_FUNCTIONS(port) \
int eserial##port##_init (void) {\
int clock_divisor; \
clock_divisor = calc_divisor(serial_ports[port-1]); \
NS16550_init(serial_ports[port-1], clock_divisor); \
return(0);}\
void eserial##port##_setbrg (void) {\
serial_setbrg_dev(port);}\
int eserial##port##_getc (void) {\
return serial_getc_dev(port);}\
int eserial##port##_tstc (void) {\
return serial_tstc_dev(port);}\
void eserial##port##_putc (const char c) {\
serial_putc_dev(port, c);}\
void eserial##port##_puts (const char *s) {\
serial_puts_dev(port, s);}
/* Serial device descriptor */
#define INIT_ESERIAL_STRUCTURE(port,name,bus) {\
name,\
bus,\
eserial##port##_init,\
NULL,\
eserial##port##_setbrg,\
eserial##port##_getc,\
eserial##port##_tstc,\
eserial##port##_putc,\
eserial##port##_puts, }
#endif /* CONFIG_SERIAL_MULTI */
static int calc_divisor (NS16550_t port)
{
#ifdef CONFIG_OMAP1510
/* If can't cleanly clock 115200 set div to 1 */
if ((CONFIG_SYS_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) {
port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */
return (1); /* return 1 for base divisor */
}
port->osc_12m_sel = 0; /* clear if previsouly set */
#endif
#ifdef CONFIG_OMAP1610
/* If can't cleanly clock 115200 set div to 1 */
if ((CONFIG_SYS_NS16550_CLK == 48000000) && (gd->baudrate == 115200)) {
return (26); /* return 26 for base divisor */
}
#endif
#ifdef CONFIG_APTIX
#define MODE_X_DIV 13
#else
#define MODE_X_DIV 16
#endif
/* Compute divisor value. Normally, we should simply return:
* CONFIG_SYS_NS16550_CLK) / MODE_X_DIV / gd->baudrate
* but we need to round that value by adding 0.5.
* Rounding is especially important at high baud rates.
*/
return (CONFIG_SYS_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) /
(MODE_X_DIV * gd->baudrate);
}
#if !defined(CONFIG_SERIAL_MULTI)
int serial_init (void)
{
int clock_divisor;
#ifdef CONFIG_NS87308
initialise_ns87308();
#endif
#ifdef CONFIG_SYS_NS16550_COM1
clock_divisor = calc_divisor(serial_ports[0]);
NS16550_init(serial_ports[0], clock_divisor);
#endif
#ifdef CONFIG_SYS_NS16550_COM2
clock_divisor = calc_divisor(serial_ports[1]);
NS16550_init(serial_ports[1], clock_divisor);
#endif
#ifdef CONFIG_SYS_NS16550_COM3
clock_divisor = calc_divisor(serial_ports[2]);
NS16550_init(serial_ports[2], clock_divisor);
#endif
#ifdef CONFIG_SYS_NS16550_COM4
clock_divisor = calc_divisor(serial_ports[3]);
NS16550_init(serial_ports[3], clock_divisor);
#endif
return (0);
}
#endif
void
_serial_putc(const char c,const int port)
{
if (c == '\n')
NS16550_putc(PORT, '\r');
NS16550_putc(PORT, c);
}
void
_serial_putc_raw(const char c,const int port)
{
NS16550_putc(PORT, c);
}
void
_serial_puts (const char *s,const int port)
{
while (*s) {
_serial_putc (*s++,port);
}
}
int
_serial_getc(const int port)
{
return NS16550_getc(PORT);
}
int
_serial_tstc(const int port)
{
return NS16550_tstc(PORT);
}
void
_serial_setbrg (const int port)
{
int clock_divisor;
clock_divisor = calc_divisor(PORT);
NS16550_reinit(PORT, clock_divisor);
}
#if defined(CONFIG_SERIAL_MULTI)
static inline void
serial_putc_dev(unsigned int dev_index,const char c)
{
_serial_putc(c,dev_index);
}
#else
void
serial_putc(const char c)
{
_serial_putc(c,CONFIG_CONS_INDEX);
}
#endif
#if defined(CONFIG_SERIAL_MULTI)
static inline void
serial_putc_raw_dev(unsigned int dev_index,const char c)
{
_serial_putc_raw(c,dev_index);
}
#else
void
serial_putc_raw(const char c)
{
_serial_putc_raw(c,CONFIG_CONS_INDEX);
}
#endif
#if defined(CONFIG_SERIAL_MULTI)
static inline void
serial_puts_dev(unsigned int dev_index,const char *s)
{
_serial_puts(s,dev_index);
}
#else
void
serial_puts(const char *s)
{
_serial_puts(s,CONFIG_CONS_INDEX);
}
#endif
#if defined(CONFIG_SERIAL_MULTI)
static inline int
serial_getc_dev(unsigned int dev_index)
{
return _serial_getc(dev_index);
}
#else
int
serial_getc(void)
{
return _serial_getc(CONFIG_CONS_INDEX);
}
#endif
#if defined(CONFIG_SERIAL_MULTI)
static inline int
serial_tstc_dev(unsigned int dev_index)
{
return _serial_tstc(dev_index);
}
#else
int
serial_tstc(void)
{
return _serial_tstc(CONFIG_CONS_INDEX);
}
#endif
#if defined(CONFIG_SERIAL_MULTI)
static inline void
serial_setbrg_dev(unsigned int dev_index)
{
_serial_setbrg(dev_index);
}
#else
void
serial_setbrg(void)
{
_serial_setbrg(CONFIG_CONS_INDEX);
}
#endif
#if defined(CONFIG_SERIAL_MULTI)
DECLARE_ESERIAL_FUNCTIONS(1);
struct serial_device eserial1_device =
INIT_ESERIAL_STRUCTURE(1,"eserial0","EUART1");
DECLARE_ESERIAL_FUNCTIONS(2);
struct serial_device eserial2_device =
INIT_ESERIAL_STRUCTURE(2,"eserial1","EUART2");
DECLARE_ESERIAL_FUNCTIONS(3);
struct serial_device eserial3_device =
INIT_ESERIAL_STRUCTURE(3,"eserial2","EUART3");
DECLARE_ESERIAL_FUNCTIONS(4);
struct serial_device eserial4_device =
INIT_ESERIAL_STRUCTURE(4,"eserial3","EUART4");
#endif /* CONFIG_SERIAL_MULTI */
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