drivers/serial/serial_ks8695.c

   1 /*
   2  * serial.c -- KS8695 serial driver
   3  *
   4  * (C) Copyright 2004, Greg Ungerer <greg.ungerer@opengear.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <common.h>
  22 #include <asm/arch/platform.h>
  23
  24 #ifndef CONFIG_SERIAL1
  25 #error "Bad: you didn't configure serial ..."
  26 #endif
  27
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 /*
  31  *      Define the UART hardware register access structure.
  32  */
  33 struct ks8695uart {
  34         unsigned int    RX;             /* 0x00 - Receive data (r) */
  35         unsigned int    TX;             /* 0x04 - Transmit data (w) */
  36         unsigned int    FCR;            /* 0x08 - Fifo Control (r/w) */
  37         unsigned int    LCR;            /* 0x0c - Line Control (r/w) */
  38         unsigned int    MCR;            /* 0x10 - Modem Control (r/w) */
  39         unsigned int    LSR;            /* 0x14 - Line Status (r/w) */
  40         unsigned int    MSR;            /* 0x18 - Modem Status (r/w) */
  41         unsigned int    BD;             /* 0x1c - Baud Rate (r/w) */
  42         unsigned int    SR;             /* 0x20 - Status (r/w) */
  43 };
  44
  45 #define KS8695_UART_ADDR        ((void *) (KS8695_IO_BASE + KS8695_UART_RX_BUFFER))
  46 #define KS8695_UART_CLK         25000000
  47
  48
  49 /*
  50  * Under some circumstances we want to be "quiet" and not issue any
  51  * serial output - though we want u-boot to otherwise work and behave
  52  * the same. By default be noisy.
  53  */
  54 int serial_console = 1;
  55
  56
  57 void serial_setbrg(void)
  58 {
  59         volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
  60
  61         /* Set to global baud rate and 8 data bits, no parity, 1 stop bit*/
  62         uartp->BD = KS8695_UART_CLK / gd->baudrate;
  63         uartp->LCR = KS8695_UART_LINEC_WLEN8;
  64 }
  65
  66 int serial_init(void)
  67 {
  68         serial_console = 1;
  69         serial_setbrg();
  70         return 0;
  71 }
  72
  73 void serial_raw_putc(const char c)
  74 {
  75         volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
  76         int i;
  77
  78         for (i = 0; (i < 0x100000); i++) {
  79                 if (uartp->LSR & KS8695_UART_LINES_TXFE)
  80                         break;
  81         }
  82
  83         uartp->TX = c;
  84 }
  85
  86 void serial_putc(const char c)
  87 {
  88         if (serial_console) {
  89                 serial_raw_putc(c);
  90                 if (c == '\n')
  91                         serial_raw_putc('\r');
  92         }
  93 }
  94
  95 int serial_tstc(void)
  96 {
  97         volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
  98         if (serial_console)
  99                 return ((uartp->LSR & KS8695_UART_LINES_RXFE) ? 1 : 0);
 100         return 0;
 101 }
 102
 103 void serial_puts(const char *s)
 104 {
 105         char c;
 106         while ((c = *s++) != 0)
 107                 serial_putc(c);
 108 }
 109
 110 int serial_getc(void)
 111 {
 112         volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
 113
 114         while ((uartp->LSR & KS8695_UART_LINES_RXFE) == 0)
 115                 ;
 116         return (uartp->RX);
 117 }