LXR uboot/drivers/serial/serial

   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
  28DECLARE_GLOBAL_DATA_PTR;
  29
  30/*
  31 *      Define the UART hardware register access structure.
  32 */
  33struct 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 */
  54int serial_console = 1;
  55
  56
  57void 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
  66int serial_init(void)
  67{
  68        serial_console = 1;
  69        serial_setbrg();
  70        return 0;
  71}
  72
  73void 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
  86void 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
  95int 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
 103void serial_puts(const char *s)
 104{
 105        char c;
 106        while ((c = *s++) != 0)
 107                serial_putc(c);
 108}
 109
 110int 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}
 118