cpu/arm720t/serial_netarm.c

   1 /*
   2  * Serial Port stuff - taken from Linux
   3  *
   4  * (C) Copyright 2002
   5  * MAZeT GmbH <www.mazet.de>
   6  * Stephan Linz <linz@mazet.de>, <linz@li-pro.net>
   7  *
   8  * (c) 2004
   9  * IMMS gGmbH <www.imms.de>
  10  * Thomas Elste <info@elste.org>
  11  *
  12  * See file CREDITS for list of people who contributed to this
  13  * project.
  14  *
  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.
  19  *
  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.
  24  *
  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
  28  *
  29  */
  30
  31 #include <common.h>
  32
  33 #ifdef CONFIG_NETARM
  34
  35 #include <asm/hardware.h>
  36
  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))
  40 #else
  41 #define PORTC   (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTC))
  42 #endif
  43
  44 /* wait until transmitter is ready for another character */
  45 #define TXWAITRDY(registers)                                                    \
  46 {                                                                               \
  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)                                         \
  50                         break;                                                  \
  51         }                                                                       \
  52 }
  53
  54
  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);
  58 #else
  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);
  61 #endif
  62
  63 extern void _netarm_led_FAIL1(void);
  64
  65 /*
  66  * Setup both serial i/f with given baudrate
  67  */
  68 void serial_setbrg (void)
  69 {
  70         /* get the gd pointer */
  71         DECLARE_GLOBAL_DATA_PTR;
  72
  73         /* set 0 ... make sure pins are configured for serial */
  74 #if !defined(CONFIG_NETARM_NS7520)
  75         PORTA = PORTB =
  76                 NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
  77 #else
  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);
  80 #endif
  81
  82         /* first turn em off */
  83         serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a = 0;
  84
  85         /* clear match register, we don't need it */
  86         serial_reg_ch1->rx_match = serial_reg_ch2->rx_match = 0;
  87
  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 =
  94                         0;
  95                 serial_reg_ch1->rx_char_timer = serial_reg_ch2->rx_char_timer =
  96                         NETARM_SER_RXGAP (gd->baudrate);
  97         } else {
  98                 hang ();
  99         }
 100
 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 |
 108                   /* see errata */
 109                   NETARM_SER_CTLA_2STOP |
 110                   NETARM_SER_CTLA_8BITS |
 111                   NETARM_SER_CTLA_DTR_EN |
 112                   NETARM_SER_CTLA_RTS_EN);
 113 }
 114
 115
 116 /*
 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.
 119  */
 120 int serial_init (void)
 121 {
 122         serial_setbrg ();
 123         return 0;
 124 }
 125
 126
 127 /*
 128  * Output a single byte to the serial port.
 129  */
 130 void serial_putc (const char c)
 131 {
 132         volatile unsigned char *fifo;
 133
 134         /* If \n, also do \r */
 135         if (c == '\n')
 136                 serial_putc ('\r');
 137
 138         fifo = (volatile unsigned char *) &(serial_reg_ch1->fifo);
 139         TXWAITRDY (serial_reg_ch1);
 140         *fifo = c;
 141 }
 142
 143 /*
 144  * Test of a single byte from the serial port. Returns 1 on success, 0
 145  * otherwise.
 146  */
 147 int serial_tstc(void)
 148 {
 149         return serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY;
 150 }
 151
 152 /*
 153  * Read a single byte from the serial port. Returns 1 on success, 0
 154  * otherwise.
 155  */
 156 int serial_getc (void)
 157 {
 158         unsigned int ch_uint;
 159         volatile unsigned int *fifo;
 160         volatile unsigned char *fifo_char = NULL;
 161         int buf_count = 0;
 162
 163         while (!(serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY))
 164                 /* NOP */ ;
 165
 166         fifo = (volatile unsigned int *) &(serial_reg_ch1->fifo);
 167         fifo_char = (unsigned char *) &ch_uint;
 168         ch_uint = *fifo;
 169
 170         buf_count = NETARM_SER_STATA_RXFDB (serial_reg_ch1->status_a);
 171         switch (buf_count) {
 172         case NETARM_SER_STATA_RXFDB_4BYTES:
 173                 buf_count = 4;
 174                 break;
 175         case NETARM_SER_STATA_RXFDB_3BYTES:
 176                 buf_count = 3;
 177                 break;
 178         case NETARM_SER_STATA_RXFDB_2BYTES:
 179                 buf_count = 2;
 180                 break;
 181         case NETARM_SER_STATA_RXFDB_1BYTES:
 182                 buf_count = 1;
 183                 break;
 184         default:
 185                 /* panic, be never here */
 186                 break;
 187         }
 188
 189         serial_reg_ch1->status_a |= NETARM_SER_STATA_RX_CLOSED;
 190
 191         return ch_uint & 0xff;
 192 }
 193
 194 void serial_puts (const char *s)
 195 {
 196         while (*s) {
 197                 serial_putc (*s++);
 198         }
 199 }
 200
 201 #endif /* CONFIG_NETARM */