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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSBSPsRISCVNOEL
*
* @brief This source file contains NOEL-V/APBUART definitions of
* ::BSP_output_char_function_type and :: BSP_output_char and an
* implementation of console_initialize().
*/
/*
* Copyright (c) 2021 Cobham Gaisler AB.
*
* Copyright (C) 2018 embedded brains GmbH & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/bspIo.h>
#include <rtems/console.h>
#include <rtems/sysinit.h>
#include <rtems/termiostypes.h>
#include <bsp/fatal.h>
#include <bsp/fdt.h>
#include <bsp/irq.h>
#include <bsp/riscv.h>
#include <libfdt.h>
#include <grlib/apbuart.h>
#include <grlib/apbuart_termios.h>
static struct apbuart_context apbuarts[RISCV_CONSOLE_MAX_APBUART_DEVICES];
static size_t apbuart_devices = 0;
static struct {
rtems_termios_device_context *context;
void (*putchar)(rtems_termios_device_context *base, char c);
int (*getchar)(rtems_termios_device_context *base);
} riscv_console;
static void riscv_output_char(char c)
{
(*riscv_console.putchar)(riscv_console.context, c);
}
static void apbuart_putchar(rtems_termios_device_context *base, char c)
{
struct apbuart_context *ctx = (struct apbuart_context *) base;
apbuart_outbyte_polled(ctx->regs, c);
}
static int apbuart_getchar(rtems_termios_device_context *base)
{
struct apbuart_context *ctx = (struct apbuart_context *) base;
return apbuart_inbyte_nonblocking(ctx->regs);
}
#define RISCV_CONSOLE_IS_COMPATIBLE(actual, actual_len, desired) \
(actual_len == sizeof(desired) \
&& memcmp(actual, desired, sizeof(desired) - 1) == 0)
static uint32_t get_core_frequency(void)
{
uint32_t node;
const char *fdt;
int len;
const fdt32_t *val;
fdt = bsp_fdt_get();
node = fdt_node_offset_by_compatible(fdt, -1, "fixed-clock");
val = fdt_getprop(fdt, node, "clock-frequency", &len);
if (val == NULL && len != 4) {
bsp_fatal(RISCV_FATAL_NO_APBUART_CLOCK_FREQUENCY_IN_DEVICE_TREE);
}
return fdt32_to_cpu(*val);
}
static void riscv_console_probe(void)
{
const void *fdt;
int node;
fdt = bsp_fdt_get();
node = fdt_next_node(fdt, -1, NULL);
while (node >= 0) {
const char *compat;
int compat_len;
compat = fdt_getprop(fdt, node, "compatible", &compat_len);
if (compat == NULL) {
compat_len = 0;
}
if (
RISCV_CONSOLE_IS_COMPATIBLE(compat, compat_len, "gaisler,apbuart")
&& (apbuart_devices < RISCV_CONSOLE_MAX_APBUART_DEVICES)
) {
struct apbuart_context *ctx;
fdt32_t *val;
int len;
ctx = &apbuarts[apbuart_devices];
ctx->regs = riscv_fdt_get_address(fdt, node);
if (ctx->regs == NULL) {
bsp_fatal(RISCV_FATAL_NO_APBUART_REG_IN_DEVICE_TREE);
}
ctx->freq_hz = get_core_frequency();
val = (fdt32_t *) fdt_getprop(fdt, node, "interrupts", &len);
if (val == NULL || len != 4) {
bsp_fatal(RISCV_FATAL_NO_APBUART_INTERRUPTS_IN_DEVICE_TREE);
}
ctx->irq = RISCV_INTERRUPT_VECTOR_EXTERNAL(fdt32_to_cpu(val[0]));
if (apbuart_devices == 0) {
riscv_console.context = &ctx->base;
riscv_console.putchar = apbuart_putchar;
riscv_console.getchar = apbuart_getchar;
}
rtems_termios_device_context_initialize(&ctx->base, "APBUART");
apbuart_devices++;
};
node = fdt_next_node(fdt, node, NULL);
}
BSP_output_char = riscv_output_char;
}
static void riscv_output_char_init(char c)
{
riscv_console_probe();
riscv_output_char(c);
}
BSP_output_char_function_type BSP_output_char = riscv_output_char_init;
BSP_polling_getchar_function_type BSP_poll_char = NULL;
rtems_status_code console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
char path[] = "/dev/ttyS?";
rtems_termios_initialize();
const rtems_termios_device_handler *handler = &apbuart_handler_polled;
if (BSP_CONSOLE_USE_INTERRUPTS) {
handler = &apbuart_handler_interrupt;
}
for (size_t i = 0; i < apbuart_devices; ++i) {
struct apbuart_context *ctx;
ctx = &apbuarts[i];
path[sizeof(path) - 2] = (char) ('0' + i);
rtems_termios_device_install(path, handler, NULL, &ctx->base);
if (&ctx->base == riscv_console.context) {
link(path, CONSOLE_DEVICE_NAME);
}
}
return RTEMS_SUCCESSFUL;
}
RTEMS_SYSINIT_ITEM(
riscv_console_probe,
RTEMS_SYSINIT_BSP_START,
RTEMS_SYSINIT_ORDER_LAST_BUT_5
);
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