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/*
* Copyright (c) 2009 Wind River Systems, Inc.
* Tom Rix <Tom.Rix@windriver.com>
*
* SPDX-License-Identifier: GPL-2.0+
*
* This file was adapted from arch/powerpc/cpu/mpc5xxx/serial.c
*/
#include <common.h>
#include <serial.h>
#include <ns16550.h>
#include <asm/arch/cpu.h>
#include "zoom2_serial.h"
int quad_init_dev (unsigned long base)
{
/*
* The Quad UART is on the debug board.
* Check if the debug board is attached before using the UART
*/
if (zoom2_debug_board_connected ()) {
NS16550_t com_port = (NS16550_t) base;
int baud_divisor = CONFIG_SYS_NS16550_CLK / 16 /
CONFIG_BAUDRATE;
/*
* Zoom2 has a board specific initialization of its UART.
* This generic initialization has been copied from
* drivers/serial/ns16550.c. The macros have been expanded.
*
* Do the following instead of
*
* NS16550_init (com_port, clock_divisor);
*/
com_port->ier = 0x00;
/*
* On Zoom2 board Set pre-scalar to 1
* CLKSEL is GND => MCR[7] is 1 => preslr is 4
* So change the prescl to 1
*/
com_port->lcr = 0xBF;
com_port->fcr |= 0x10;
com_port->mcr &= 0x7F;
/* This is generic ns16550.c setup */
com_port->lcr = UART_LCR_BKSE | UART_LCR_8N1;
com_port->dll = 0;
com_port->dlm = 0;
com_port->lcr = UART_LCR_8N1;
com_port->mcr = UART_MCR_DTR | UART_MCR_RTS;
com_port->fcr = UART_FCR_FIFO_EN | UART_FCR_RXSR |
UART_FCR_TXSR;
com_port->lcr = UART_LCR_BKSE | UART_LCR_8N1;
com_port->dll = baud_divisor & 0xff;
com_port->dlm = (baud_divisor >> 8) & 0xff;
com_port->lcr = UART_LCR_8N1;
}
/*
* We have to lie here, otherwise the board init code will hang
* on the check
*/
return 0;
}
void quad_putc_dev (unsigned long base, const char c)
{
if (zoom2_debug_board_connected ()) {
if (c == '\n')
quad_putc_dev (base, '\r');
NS16550_putc ((NS16550_t) base, c);
} else {
usbtty_putc(c);
}
}
void quad_puts_dev (unsigned long base, const char *s)
{
if (zoom2_debug_board_connected ()) {
while ((s != NULL) && (*s != '\0'))
quad_putc_dev (base, *s++);
} else {
usbtty_puts(s);
}
}
int quad_getc_dev (unsigned long base)
{
if (zoom2_debug_board_connected ())
return NS16550_getc ((NS16550_t) base);
return usbtty_getc();
}
int quad_tstc_dev (unsigned long base)
{
if (zoom2_debug_board_connected ())
return NS16550_tstc ((NS16550_t) base);
return usbtty_tstc();
}
void quad_setbrg_dev (unsigned long base)
{
if (zoom2_debug_board_connected ()) {
int clock_divisor = CONFIG_SYS_NS16550_CLK / 16 /
CONFIG_BAUDRATE;
NS16550_reinit ((NS16550_t) base, clock_divisor);
}
}
QUAD_INIT (0)
QUAD_INIT (1)
QUAD_INIT (2)
QUAD_INIT (3)
struct serial_device *default_serial_console(void)
{
switch (ZOOM2_DEFAULT_SERIAL_DEVICE) {
case 0: return &zoom2_serial_device0;
case 1: return &zoom2_serial_device1;
case 2: return &zoom2_serial_device2;
case 3: return &zoom2_serial_device3;
}
}
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