195 lines
5 KiB
C
195 lines
5 KiB
C
/*
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* Serial Port stuff - taken from Linux
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*
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* (C) Copyright 2002
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* MAZeT GmbH <www.mazet.de>
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* Stephan Linz <linz@mazet.de>, <linz@li-pro.net>
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*
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* (c) 2004
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* IMMS gGmbH <www.imms.de>
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* Thomas Elste <info@elste.org>
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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, MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <asm/hardware.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define PORTA (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTA))
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#if !defined(CONFIG_NETARM_NS7520)
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#define PORTB (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTB))
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#else
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#define PORTC (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTC))
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#endif
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/* wait until transmitter is ready for another character */
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#define TXWAITRDY(registers) \
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{ \
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ulong tmo = get_timer(0) + 1 * CONFIG_SYS_HZ; \
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while (((registers)->status_a & NETARM_SER_STATA_TX_RDY) == 0 ) { \
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if (get_timer(0) > tmo) \
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break; \
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} \
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}
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#ifndef CONFIG_UART1_CONSOLE
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volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(0);
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volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(1);
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#else
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volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(1);
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volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(0);
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#endif
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extern void _netarm_led_FAIL1(void);
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/*
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* Setup both serial i/f with given baudrate
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*/
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void serial_setbrg (void)
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{
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/* set 0 ... make sure pins are configured for serial */
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#if !defined(CONFIG_NETARM_NS7520)
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PORTA = PORTB =
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NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
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#else
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PORTA = NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
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PORTC = NETARM_GEN_PORT_CSF (0xef) | NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
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#endif
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/* first turn em off */
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serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a = 0;
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/* clear match register, we don't need it */
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serial_reg_ch1->rx_match = serial_reg_ch2->rx_match = 0;
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/* setup bit rate generator and rx buffer gap timer (1 byte only) */
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if ((gd->baudrate >= MIN_BAUD_RATE)
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&& (gd->baudrate <= MAX_BAUD_RATE)) {
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serial_reg_ch1->bitrate = serial_reg_ch2->bitrate =
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NETARM_SER_BR_X16 (gd->baudrate);
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serial_reg_ch1->rx_buf_timer = serial_reg_ch2->rx_buf_timer =
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0;
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serial_reg_ch1->rx_char_timer = serial_reg_ch2->rx_char_timer =
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NETARM_SER_RXGAP (gd->baudrate);
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} else {
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hang ();
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}
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/* setup port mode */
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serial_reg_ch1->ctrl_b = serial_reg_ch2->ctrl_b =
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( NETARM_SER_CTLB_RCGT_EN |
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NETARM_SER_CTLB_UART_MODE);
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serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a =
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( NETARM_SER_CTLA_ENABLE |
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NETARM_SER_CTLA_P_NONE |
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/* see errata */
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NETARM_SER_CTLA_2STOP |
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NETARM_SER_CTLA_8BITS |
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NETARM_SER_CTLA_DTR_EN |
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NETARM_SER_CTLA_RTS_EN);
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}
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/*
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* Initialise the serial port with the given baudrate. The settings
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* are always 8 data bits, no parity, 1 stop bit, no start bits.
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*/
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int serial_init (void)
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{
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serial_setbrg ();
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return 0;
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}
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/*
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* Output a single byte to the serial port.
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*/
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void serial_putc (const char c)
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{
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volatile unsigned char *fifo;
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/* If \n, also do \r */
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if (c == '\n')
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serial_putc ('\r');
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fifo = (volatile unsigned char *) &(serial_reg_ch1->fifo);
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TXWAITRDY (serial_reg_ch1);
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*fifo = c;
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}
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/*
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* Test of a single byte from the serial port. Returns 1 on success, 0
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* otherwise.
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*/
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int serial_tstc(void)
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{
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return serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY;
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}
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/*
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* Read a single byte from the serial port. Returns 1 on success, 0
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* otherwise.
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*/
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int serial_getc (void)
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{
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unsigned int ch_uint;
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volatile unsigned int *fifo;
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volatile unsigned char *fifo_char = NULL;
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int buf_count = 0;
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while (!(serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY))
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/* NOP */ ;
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fifo = (volatile unsigned int *) &(serial_reg_ch1->fifo);
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fifo_char = (unsigned char *) &ch_uint;
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ch_uint = *fifo;
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buf_count = NETARM_SER_STATA_RXFDB (serial_reg_ch1->status_a);
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switch (buf_count) {
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case NETARM_SER_STATA_RXFDB_4BYTES:
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buf_count = 4;
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break;
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case NETARM_SER_STATA_RXFDB_3BYTES:
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buf_count = 3;
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break;
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case NETARM_SER_STATA_RXFDB_2BYTES:
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buf_count = 2;
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break;
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case NETARM_SER_STATA_RXFDB_1BYTES:
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buf_count = 1;
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break;
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default:
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/* panic, be never here */
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break;
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}
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serial_reg_ch1->status_a |= NETARM_SER_STATA_RX_CLOSED;
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return ch_uint & 0xff;
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}
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void serial_puts (const char *s)
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{
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while (*s) {
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serial_putc (*s++);
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}
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}
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