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/*
* Serial Port stuff - taken from Linux
*
* (C) Copyright 2002
* MAZeT GmbH <www.mazet.de>
* Stephan Linz <linz@mazet.de>, <linz@li-pro.net>
*
* (c) 2004
* IMMS gGmbH <www.imms.de>
* Thomas Elste <info@elste.org>
*
* 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 <asm/hardware.h>
DECLARE_GLOBAL_DATA_PTR;
#define PORTA (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTA))
#if !defined(CONFIG_NETARM_NS7520)
#define PORTB (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTB))
#else
#define PORTC (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTC))
#endif
/* wait until transmitter is ready for another character */
#define TXWAITRDY(registers) \
{ \
ulong tmo = get_timer(0) + 1 * CONFIG_SYS_HZ; \
while (((registers)->status_a & NETARM_SER_STATA_TX_RDY) == 0 ) { \
if (get_timer(0) > tmo) \
break; \
} \
}
volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(0);
volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(1);
extern void _netarm_led_FAIL1(void);
/*
* Setup both serial i/f with given baudrate
*/
static void netarm_serial_setbrg(void)
{
/* set 0 ... make sure pins are configured for serial */
#if !defined(CONFIG_NETARM_NS7520)
PORTA = PORTB =
NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
#else
PORTA = NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
PORTC = NETARM_GEN_PORT_CSF (0xef) | NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
#endif
/* first turn em off */
serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a = 0;
/* clear match register, we don't need it */
serial_reg_ch1->rx_match = serial_reg_ch2->rx_match = 0;
/* setup bit rate generator and rx buffer gap timer (1 byte only) */
if ((gd->baudrate >= MIN_BAUD_RATE)
&& (gd->baudrate <= MAX_BAUD_RATE)) {
serial_reg_ch1->bitrate = serial_reg_ch2->bitrate =
NETARM_SER_BR_X16 (gd->baudrate);
serial_reg_ch1->rx_buf_timer = serial_reg_ch2->rx_buf_timer =
0;
serial_reg_ch1->rx_char_timer = serial_reg_ch2->rx_char_timer =
NETARM_SER_RXGAP (gd->baudrate);
} else {
hang ();
}
/* setup port mode */
serial_reg_ch1->ctrl_b = serial_reg_ch2->ctrl_b =
( NETARM_SER_CTLB_RCGT_EN |
NETARM_SER_CTLB_UART_MODE);
serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a =
( NETARM_SER_CTLA_ENABLE |
NETARM_SER_CTLA_P_NONE |
/* see errata */
NETARM_SER_CTLA_2STOP |
NETARM_SER_CTLA_8BITS |
NETARM_SER_CTLA_DTR_EN |
NETARM_SER_CTLA_RTS_EN);
}
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*/
static int netarm_serial_init(void)
{
serial_setbrg ();
return 0;
}
/*
* Output a single byte to the serial port.
*/
static void netarm_serial_putc(const char c)
{
volatile unsigned char *fifo;
/* If \n, also do \r */
if (c == '\n')
serial_putc ('\r');
fifo = (volatile unsigned char *) &(serial_reg_ch1->fifo);
TXWAITRDY (serial_reg_ch1);
*fifo = c;
}
/*
* Test of a single byte from the serial port. Returns 1 on success, 0
* otherwise.
*/
static int netarm_serial_tstc(void)
{
return serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY;
}
/*
* Read a single byte from the serial port. Returns 1 on success, 0
* otherwise.
*/
static int netarm_serial_getc(void)
{
unsigned int ch_uint;
volatile unsigned int *fifo;
volatile unsigned char *fifo_char = NULL;
int buf_count = 0;
while (!(serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY))
/* NOP */ ;
fifo = (volatile unsigned int *) &(serial_reg_ch1->fifo);
fifo_char = (unsigned char *) &ch_uint;
ch_uint = *fifo;
buf_count = NETARM_SER_STATA_RXFDB (serial_reg_ch1->status_a);
switch (buf_count) {
case NETARM_SER_STATA_RXFDB_4BYTES:
buf_count = 4;
break;
case NETARM_SER_STATA_RXFDB_3BYTES:
buf_count = 3;
break;
case NETARM_SER_STATA_RXFDB_2BYTES:
buf_count = 2;
break;
case NETARM_SER_STATA_RXFDB_1BYTES:
buf_count = 1;
break;
default:
/* panic, be never here */
break;
}
serial_reg_ch1->status_a |= NETARM_SER_STATA_RX_CLOSED;
return ch_uint & 0xff;
}
static struct serial_device netarm_serial_drv = {
.name = "netarm_serial",
.start = netarm_serial_init,
.stop = NULL,
.setbrg = netarm_serial_setbrg,
.putc = netarm_serial_putc,
.puts = default_serial_puts,
.getc = netarm_serial_getc,
.tstc = netarm_serial_tstc,
};
void netarm_serial_initialize(void)
{
serial_register(&netarm_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &netarm_serial_drv;
}
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