drivers/serial.c

   1 /*
   2  * (C) Copyright 2000
   3  * Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25
  26 #ifdef CFG_NS16550_SERIAL
  27
  28 #include <ns16550.h>
  29 #ifdef CFG_NS87308
  30 #include <ns87308.h>
  31 #endif
  32
  33 #if CONFIG_CONS_INDEX == 1
  34 static NS16550_t console = (NS16550_t) CFG_NS16550_COM1;
  35 #elif CONFIG_CONS_INDEX == 2
  36 static NS16550_t console = (NS16550_t) CFG_NS16550_COM2;
  37 #elif CONFIG_CONS_INDEX == 3
  38 static NS16550_t console = (NS16550_t) CFG_NS16550_COM3;
  39 #elif CONFIG_CONS_INDEX == 4
  40 static NS16550_t console = (NS16550_t) CFG_NS16550_COM4;
  41 #else
  42 #error no valid console defined
  43 #endif
  44
  45 static int calc_divisor (void)
  46 {
  47         DECLARE_GLOBAL_DATA_PTR;
  48 #ifdef CONFIG_OMAP1510
  49         /* If can't cleanly clock 115200 set div to 1 */
  50         if ((CFG_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) {
  51                 console->osc_12m_sel = OSC_12M_SEL;     /* enable 6.5 * divisor */
  52                 return (1);                             /* return 1 for base divisor */
  53         }
  54         console->osc_12m_sel = 0;                       /* clear if previsouly set */
  55 #endif
  56 #ifdef CONFIG_OMAP1610
  57         /* If can't cleanly clock 115200 set div to 1 */
  58         if ((CFG_NS16550_CLK == 48000000) && (gd->baudrate == 115200)) {
  59                 return (26);            /* return 26 for base divisor */
  60         }
  61 #endif
  62         return (CFG_NS16550_CLK / 16 / gd->baudrate);
  63 }
  64
  65 int serial_init (void)
  66 {
  67         int clock_divisor = calc_divisor();
  68
  69 #ifdef CFG_NS87308
  70         initialise_ns87308();
  71 #endif
  72
  73         NS16550_init(console, clock_divisor);
  74
  75         return (0);
  76 }
  77
  78 void
  79 serial_putc(const char c)
  80 {
  81         if (c == '\n')
  82                 NS16550_putc(console, '\r');
  83
  84         NS16550_putc(console, c);
  85 }
  86
  87 void
  88 serial_puts (const char *s)
  89 {
  90         while (*s) {
  91                 serial_putc (*s++);
  92         }
  93 }
  94
  95
  96 int
  97 serial_getc(void)
  98 {
  99         return NS16550_getc(console);
 100 }
 101
 102 int
 103 serial_tstc(void)
 104 {
 105         return NS16550_tstc(console);
 106 }
 107
 108 void
 109 serial_setbrg (void)
 110 {
 111         int clock_divisor;
 112
 113     clock_divisor = calc_divisor();
 114         NS16550_reinit(console, clock_divisor);
 115 }
 116
 117 #endif