2 * Serial Port stuff - taken from Linux
5 * MAZeT GmbH <www.mazet.de>
6 * Stephan Linz <linz@mazet.de>, <linz@li-pro.net>
9 * IMMS gGmbH <www.imms.de>
10 * Thomas Elste <info@elste.org>
12 * See file CREDITS for list of people who contributed to this
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 #include <asm/arch/netarm_registers.h>
36 #define PORTA (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTA))
37 #define PORTB (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTB))
39 /* wait until transmitter is ready for another character */
40 #define TXWAITRDY(registers) \
42 ulong tmo = get_timer(0) + 1 * CFG_HZ; \
43 while (((registers)->status_a & NETARM_SER_STATA_TX_RDY) == 0 ) { \
44 if (get_timer(0) > tmo) \
50 volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(0);
51 volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(1);
53 extern void _netarm_led_FAIL1(void);
56 * Setup both serial i/f with given baudrate
58 void serial_setbrg (void)
60 /* get the gd pointer */
61 DECLARE_GLOBAL_DATA_PTR;
63 /* set 0 ... make sure pins are configured for serial */
65 NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
67 /* first turn em off */
68 serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a = 0;
70 /* clear match register, we don't need it */
71 serial_reg_ch1->rx_match = serial_reg_ch2->rx_match = 0;
73 /* setup bit rate generator and rx buffer gap timer (1 byte only) */
74 if ((gd->baudrate >= MIN_BAUD_RATE)
75 && (gd->baudrate <= MAX_BAUD_RATE)) {
76 serial_reg_ch1->bitrate = serial_reg_ch2->bitrate =
77 NETARM_SER_BR_X16 (gd->baudrate);
78 serial_reg_ch1->rx_buf_timer = serial_reg_ch2->rx_buf_timer =
80 serial_reg_ch1->rx_char_timer = serial_reg_ch2->rx_char_timer =
81 NETARM_SER_RXGAP (gd->baudrate);
87 serial_reg_ch1->ctrl_b = serial_reg_ch2->ctrl_b =
88 ( NETARM_SER_CTLB_RCGT_EN |
89 NETARM_SER_CTLB_UART_MODE);
90 serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a =
91 ( NETARM_SER_CTLA_ENABLE |
92 NETARM_SER_CTLA_P_NONE |
94 NETARM_SER_CTLA_2STOP |
95 NETARM_SER_CTLA_8BITS |
96 NETARM_SER_CTLA_DTR_EN |
97 NETARM_SER_CTLA_RTS_EN);
102 * Initialise the serial port with the given baudrate. The settings
103 * are always 8 data bits, no parity, 1 stop bit, no start bits.
105 int serial_init (void)
113 * Output a single byte to the serial port.
115 void serial_putc (const char c)
117 volatile unsigned char *fifo;
119 /* If \n, also do \r */
123 fifo = (volatile unsigned char *) &(serial_reg_ch1->fifo);
124 TXWAITRDY (serial_reg_ch1);
129 * Test of a single byte from the serial port. Returns 1 on success, 0
132 int serial_tstc(void)
134 return serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY;
138 * Read a single byte from the serial port. Returns 1 on success, 0
141 int serial_getc (void)
143 unsigned int ch_uint;
144 volatile unsigned int *fifo;
145 volatile unsigned char *fifo_char = NULL;
148 while (!(serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY))
151 fifo = (volatile unsigned int *) &(serial_reg_ch1->fifo);
152 fifo_char = (unsigned char *) &ch_uint;
155 buf_count = NETARM_SER_STATA_RXFDB (serial_reg_ch1->status_a);
157 case NETARM_SER_STATA_RXFDB_4BYTES:
160 case NETARM_SER_STATA_RXFDB_3BYTES:
163 case NETARM_SER_STATA_RXFDB_2BYTES:
166 case NETARM_SER_STATA_RXFDB_1BYTES:
170 /* panic, be never here */
173 serial_reg_ch1->status_a |= NETARM_SER_STATA_RX_CLOSED;
175 return ch_uint & 0xff;
178 void serial_puts (const char *s)
185 #endif /* CONFIG_NETARM */