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/**
* @file
*
* @ingroup raspberrypi_usart
*
* @brief Console Configuration.
*/
/*
* Copyright (c) 2015 Yang Qiao
* based on work by:
* Copyright (c) 2013 Alan Cudmore
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
*
* http://www.rtems.org/license/LICENSE
*
*/
#include <rtems/bspIo.h>
#include <rtems/console.h>
#include <rtems/sysinit.h>
#include <libchip/serial.h>
#include <libfdt.h>
#include <libchip/ns16550.h>
#include <bspopts.h>
#include <bsp/usart.h>
#include <bsp/raspberrypi.h>
#include <bsp/fbcons.h>
#include <bsp.h>
#include <bsp/arm-pl011.h>
#include <bsp/console-termios.h>
#include <bsp/fdt.h>
#include <bsp/fatal.h>
#include <bsp/gpio.h>
#include <bsp/rpi-gpio.h>
/**
* UART0 - PL011
* UART1 - Mini UART
*/
#define PL011 "/dev/ttyAMA0"
#define MINIUART "/dev/ttyS0"
#define FBCONS "/dev/fbcons"
arm_pl011_context pl011_context;
ns16550_context mini_uart_context;
rpi_fb_context fb_context;
static void output_char_pl011(char c)
{
arm_pl011_write_polled(&pl011_context.base, c);
}
static void output_char_mini_uart(char c)
{
ns16550_polled_putchar(&mini_uart_context.base, c);
}
void output_char_fb(char c)
{
fbcons_write_polled(&fb_context.base, c);
}
static uint8_t mini_uart_get_reg(uintptr_t port, uint8_t index)
{
volatile uint32_t *val = (volatile uint32_t *)port + index;
return (uint8_t) *val;
}
static void mini_uart_set_reg(uintptr_t port, uint8_t index, uint8_t val)
{
volatile uint32_t *reg = (volatile uint32_t *)port + index;
*reg = val;
}
static void init_ctx_arm_pl011(
const void *fdt,
int node
)
{
arm_pl011_context *ctx = &pl011_context;
rtems_termios_device_context_initialize(&ctx->base, "PL011UART");
ctx->regs = raspberrypi_get_reg_of_node(fdt, node);
}
static uint32_t calculate_baud_divisor(
ns16550_context *ctx,
uint32_t baud
)
{
uint32_t baudDivisor = (ctx->clock / (8 * baud)) - 1;
return baudDivisor;
}
static void init_ctx_mini_uart(
const void *fdt,
int node
)
{
const char *status;
int len;
ns16550_context *ctx;
memset(&mini_uart_context, 0, sizeof(mini_uart_context));
ctx = &mini_uart_context;
rtems_termios_device_context_initialize(&ctx->base, "MiniUART");
status = fdt_getprop(fdt, node, "status", &len);
if ( status == NULL || strcmp(status, "disabled" ) == 0){
return ;
}
ctx->port = (uintptr_t) raspberrypi_get_reg_of_node(fdt, node);
ctx->initial_baud = MINI_UART_DEFAULT_BAUD;
ctx->clock = BCM2835_CLOCK_FREQ;
ctx->calculate_baud_divisor = calculate_baud_divisor;
ctx->get_reg = mini_uart_get_reg;
ctx->set_reg = mini_uart_set_reg;
rtems_gpio_bsp_select_specific_io(0, 14, RPI_ALT_FUNC_5, NULL);
rtems_gpio_bsp_select_specific_io(0, 15, RPI_ALT_FUNC_5, NULL);
rtems_gpio_bsp_set_resistor_mode(0, 14, NO_PULL_RESISTOR);
rtems_gpio_bsp_set_resistor_mode(0, 15, NO_PULL_RESISTOR);
BCM2835_REG(AUX_ENABLES) |= 0x1;
ns16550_probe(&ctx->base);
}
static void register_fb( void )
{
if (fbcons_probe(&fb_context.base) == true) {
rtems_termios_device_install(
FBCONS,
&fbcons_fns,
NULL,
&fb_context.base);
}
}
static void console_select( void )
{
const char *opt;
opt = rpi_cmdline_get_arg("--console=");
if ( opt ) {
if ( strncmp( opt, "fbcons", sizeof( "fbcons" ) - 1 ) == 0 ) {
if ( rpi_video_is_initialized() > 0 ) {
BSP_output_char = output_char_fb;
link(FBCONS, CONSOLE_DEVICE_NAME);
return ;
}
} else if ( strncmp( opt, MINIUART, sizeof(MINIUART) - 1 ) == 0) {
BSP_output_char = output_char_mini_uart;
link(MINIUART, CONSOLE_DEVICE_NAME);
} else if ( strncmp( opt, PL011, sizeof(PL011) - 1 ) == 0) {
BSP_output_char = output_char_pl011;
link(PL011, CONSOLE_DEVICE_NAME);
}
}else {
/**
* If no command line option was given, default to PL011.
*/
BSP_output_char = output_char_pl011;
link(PL011, CONSOLE_DEVICE_NAME);
}
}
static void uart_probe(void)
{
static bool initialized = false;
const void *fdt;
const char *console;
int len;
int node;
if ( initialized ) {
return ;
}
fdt = bsp_fdt_get();
node = fdt_node_offset_by_compatible(fdt, -1, "brcm,bcm2835-pl011");
init_ctx_arm_pl011(fdt, node);
node = fdt_node_offset_by_compatible(fdt, -1, "brcm,bcm2835-aux-uart");
init_ctx_mini_uart(fdt, node);
node = fdt_path_offset(fdt, "/aliases");
console = fdt_getprop(fdt, node, "serial0", &len);
if ( strcmp(console, "/soc/serial@7e215040" ) == 0) {
BSP_output_char = output_char_mini_uart;
}else {
BSP_output_char = output_char_pl011;
}
initialized = true;
}
static void output_char(char c)
{
uart_probe();
(*BSP_output_char)(c);
}
rtems_status_code console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_termios_initialize();
uart_probe();
rtems_termios_device_install(
PL011,
&arm_pl011_fns,
NULL,
&pl011_context.base
);
rtems_termios_device_install(
MINIUART,
&ns16550_handler_polled,
NULL,
&mini_uart_context.base
);
register_fb();
console_select();
return RTEMS_SUCCESSFUL;
}
BSP_output_char_function_type BSP_output_char = output_char;
BSP_polling_getchar_function_type BSP_poll_char = NULL;
RTEMS_SYSINIT_ITEM(
uart_probe,
RTEMS_SYSINIT_BSP_START,
RTEMS_SYSINIT_ORDER_LAST_BUT_5
);
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