board/logicpd/zoom2/zoom2_serial.c

   1 /*
   2  * Copyright (c) 2009 Wind River Systems, Inc.
   3  * Tom Rix <Tom.Rix@windriver.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of
   8  * the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  18  * MA 02111-1307 USA
  19  *
  20  * This file was adapted from arch/powerpc/cpu/mpc5xxx/serial.c
  21  *
  22  */
  23
  24 #include <common.h>
  25 #include <serial.h>
  26 #include <ns16550.h>
  27 #include <asm/arch/cpu.h>
  28 #include "zoom2_serial.h"
  29
  30 int quad_init_dev (unsigned long base)
  31 {
  32         /*
  33          * The Quad UART is on the debug board.
  34          * Check if the debug board is attached before using the UART
  35          */
  36         if (zoom2_debug_board_connected ()) {
  37                 NS16550_t com_port = (NS16550_t) base;
  38                 int baud_divisor = CONFIG_SYS_NS16550_CLK / 16 /
  39                         CONFIG_BAUDRATE;
  40
  41                 /*
  42                  * Zoom2 has a board specific initialization of its UART.
  43                  * This generic initialization has been copied from
  44                  * drivers/serial/ns16550.c. The macros have been expanded.
  45                  *
  46                  * Do the following instead of
  47                  *
  48                  * NS16550_init (com_port, clock_divisor);
  49                  */
  50                 com_port->ier = 0x00;
  51
  52                 /*
  53                  * On Zoom2 board Set pre-scalar to 1
  54                  * CLKSEL is GND => MCR[7] is 1 => preslr is 4
  55                  * So change the prescl to 1
  56                  */
  57                 com_port->lcr = 0xBF;
  58                 com_port->fcr |= 0x10;
  59                 com_port->mcr &= 0x7F;
  60
  61                 /* This is generic ns16550.c setup */
  62                 com_port->lcr = UART_LCR_BKSE | UART_LCR_8N1;
  63                 com_port->dll = 0;
  64                 com_port->dlm = 0;
  65                 com_port->lcr = UART_LCR_8N1;
  66                 com_port->mcr = UART_MCR_DTR | UART_MCR_RTS;
  67                 com_port->fcr = UART_FCR_FIFO_EN | UART_FCR_RXSR |
  68                         UART_FCR_TXSR;
  69                 com_port->lcr = UART_LCR_BKSE | UART_LCR_8N1;
  70                 com_port->dll = baud_divisor & 0xff;
  71                 com_port->dlm = (baud_divisor >> 8) & 0xff;
  72                 com_port->lcr = UART_LCR_8N1;
  73         }
  74         /*
  75          * We have to lie here, otherwise the board init code will hang
  76          * on the check
  77          */
  78         return 0;
  79 }
  80
  81 void quad_putc_dev (unsigned long base, const char c)
  82 {
  83         if (zoom2_debug_board_connected ()) {
  84
  85                 if (c == '\n')
  86                         quad_putc_dev (base, '\r');
  87
  88                 NS16550_putc ((NS16550_t) base, c);
  89         } else {
  90                 usbtty_putc(c);
  91         }
  92 }
  93
  94 void quad_puts_dev (unsigned long base, const char *s)
  95 {
  96         if (zoom2_debug_board_connected ()) {
  97                 while ((s != NULL) && (*s != '\0'))
  98                         quad_putc_dev (base, *s++);
  99         } else {
 100                 usbtty_puts(s);
 101         }
 102 }
 103
 104 int quad_getc_dev (unsigned long base)
 105 {
 106         if (zoom2_debug_board_connected ())
 107                 return NS16550_getc ((NS16550_t) base);
 108
 109         return usbtty_getc();
 110 }
 111
 112 int quad_tstc_dev (unsigned long base)
 113 {
 114         if (zoom2_debug_board_connected ())
 115                 return NS16550_tstc ((NS16550_t) base);
 116
 117         return usbtty_tstc();
 118 }
 119
 120 void quad_setbrg_dev (unsigned long base)
 121 {
 122         if (zoom2_debug_board_connected ()) {
 123
 124                 int clock_divisor = CONFIG_SYS_NS16550_CLK / 16 /
 125                         CONFIG_BAUDRATE;
 126
 127                 NS16550_reinit ((NS16550_t) base, clock_divisor);
 128         }
 129 }
 130
 131 QUAD_INIT (0)
 132 QUAD_INIT (1)
 133 QUAD_INIT (2)
 134 QUAD_INIT (3)