diff options
Diffstat (limited to 'cpu/arm720t/serial_netarm.c')
| -rw-r--r-- | cpu/arm720t/serial_netarm.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/cpu/arm720t/serial_netarm.c b/cpu/arm720t/serial_netarm.c new file mode 100644 index 000000000..8cfe049b0 --- /dev/null +++ b/cpu/arm720t/serial_netarm.c @@ -0,0 +1,185 @@ +/* + * 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/arch/netarm_registers.h> + +#ifdef CONFIG_NETARM + +#define PORTA (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTA)) +#define PORTB (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTB)) + +/* wait until transmitter is ready for another character */ +#define TXWAITRDY(registers) \ +{ \ + ulong tmo = get_timer(0) + 1 * CFG_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 + */ +void serial_setbrg (void) +{ + /* get the gd pointer */ + DECLARE_GLOBAL_DATA_PTR; + + /* set 0 ... make sure pins are configured for serial */ + PORTA = PORTB = + NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0); + + /* 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. + */ +int serial_init (void) +{ + serial_setbrg (); + return 0; +} + + +/* + * Output a single byte to the serial port. + */ +void 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. + */ +int 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. + */ +int 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 */ + } + + serial_reg_ch1->status_a |= NETARM_SER_STATA_RX_CLOSED; + + return ch_uint & 0xff; +} + +void serial_puts (const char *s) +{ + while (*s) { + serial_putc (*s++); + } +} + +#endif /* CONFIG_NETARM */ |