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
35 #include <asm/hardware.h>
37 #define PORTA (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTA))
38 #if !defined(CONFIG_NETARM_NS7520)
39 #define PORTB (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTB))
41 #define PORTC (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTC))
44 /* wait until transmitter is ready for another character */
45 #define TXWAITRDY(registers) \
47 ulong tmo = get_timer(0) + 1 * CFG_HZ; \
48 while (((registers)->status_a & NETARM_SER_STATA_TX_RDY) == 0 ) { \
49 if (get_timer(0) > tmo) \
55 #ifndef CONFIG_UART1_CONSOLE
56 volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(0);
57 volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(1);
59 volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(1);
60 volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(0);
63 extern void _netarm_led_FAIL1(void);
66 * Setup both serial i/f with given baudrate
68 void serial_setbrg (void)
70 /* get the gd pointer */
71 DECLARE_GLOBAL_DATA_PTR;
73 /* set 0 ... make sure pins are configured for serial */
74 #if !defined(CONFIG_NETARM_NS7520)
76 NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
78 PORTA = NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
79 PORTC = NETARM_GEN_PORT_CSF (0xef) | NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
82 /* first turn em off */
83 serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a = 0;
85 /* clear match register, we don't need it */
86 serial_reg_ch1->rx_match = serial_reg_ch2->rx_match = 0;
88 /* setup bit rate generator and rx buffer gap timer (1 byte only) */
89 if ((gd->baudrate >= MIN_BAUD_RATE)
90 && (gd->baudrate <= MAX_BAUD_RATE)) {
91 serial_reg_ch1->bitrate = serial_reg_ch2->bitrate =
92 NETARM_SER_BR_X16 (gd->baudrate);
93 serial_reg_ch1->rx_buf_timer = serial_reg_ch2->rx_buf_timer =
95 serial_reg_ch1->rx_char_timer = serial_reg_ch2->rx_char_timer =
96 NETARM_SER_RXGAP (gd->baudrate);
101 /* setup port mode */
102 serial_reg_ch1->ctrl_b = serial_reg_ch2->ctrl_b =
103 ( NETARM_SER_CTLB_RCGT_EN |
104 NETARM_SER_CTLB_UART_MODE);
105 serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a =
106 ( NETARM_SER_CTLA_ENABLE |
107 NETARM_SER_CTLA_P_NONE |
109 NETARM_SER_CTLA_2STOP |
110 NETARM_SER_CTLA_8BITS |
111 NETARM_SER_CTLA_DTR_EN |
112 NETARM_SER_CTLA_RTS_EN);
117 * Initialise the serial port with the given baudrate. The settings
118 * are always 8 data bits, no parity, 1 stop bit, no start bits.
120 int serial_init (void)
128 * Output a single byte to the serial port.
130 void serial_putc (const char c)
132 volatile unsigned char *fifo;
134 /* If \n, also do \r */
138 fifo = (volatile unsigned char *) &(serial_reg_ch1->fifo);
139 TXWAITRDY (serial_reg_ch1);
144 * Test of a single byte from the serial port. Returns 1 on success, 0
147 int serial_tstc(void)
149 return serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY;
153 * Read a single byte from the serial port. Returns 1 on success, 0
156 int serial_getc (void)
158 unsigned int ch_uint;
159 volatile unsigned int *fifo;
160 volatile unsigned char *fifo_char = NULL;
163 while (!(serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY))
166 fifo = (volatile unsigned int *) &(serial_reg_ch1->fifo);
167 fifo_char = (unsigned char *) &ch_uint;
170 buf_count = NETARM_SER_STATA_RXFDB (serial_reg_ch1->status_a);
172 case NETARM_SER_STATA_RXFDB_4BYTES:
175 case NETARM_SER_STATA_RXFDB_3BYTES:
178 case NETARM_SER_STATA_RXFDB_2BYTES:
181 case NETARM_SER_STATA_RXFDB_1BYTES:
185 /* panic, be never here */
189 serial_reg_ch1->status_a |= NETARM_SER_STATA_RX_CLOSED;
191 return ch_uint & 0xff;
194 void serial_puts (const char *s)
201 #endif /* CONFIG_NETARM */