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/*
* Copyright (c) 2019-2020, Socionext Inc. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <drivers/console.h>
#include <errno.h>
#include <lib/mmio.h>
#include <plat/common/platform.h>
#include "uniphier.h"
#include "uniphier_console.h"
#define UNIPHIER_UART_OFFSET 0x100
#define UNIPHIER_UART_NR_PORTS 4
/* These callbacks are implemented in assembly to use crash_console_helpers.S */
int uniphier_console_putc(int character, struct console *console);
int uniphier_console_getc(struct console *console);
void uniphier_console_flush(struct console *console);
static console_t uniphier_console = {
.flags = CONSOLE_FLAG_BOOT |
#if DEBUG
CONSOLE_FLAG_RUNTIME |
#endif
CONSOLE_FLAG_CRASH |
CONSOLE_FLAG_TRANSLATE_CRLF,
.putc = uniphier_console_putc,
#if ENABLE_CONSOLE_GETC
.getc = uniphier_console_getc,
#endif
.flush = uniphier_console_flush,
};
static const uintptr_t uniphier_uart_base[] = {
[UNIPHIER_SOC_LD11] = 0x54006800,
[UNIPHIER_SOC_LD20] = 0x54006800,
[UNIPHIER_SOC_PXS3] = 0x54006800,
};
/*
* There are 4 UART ports available on this platform. By default, we want to
* use the same one as used in the previous firmware stage.
*/
static uintptr_t uniphier_console_get_base(unsigned int soc)
{
uintptr_t base, end;
uint32_t div;
assert(soc < ARRAY_SIZE(uniphier_uart_base));
base = uniphier_uart_base[soc];
end = base + UNIPHIER_UART_OFFSET * UNIPHIER_UART_NR_PORTS;
while (base < end) {
div = mmio_read_32(base + UNIPHIER_UART_DLR);
if (div)
return base;
base += UNIPHIER_UART_OFFSET;
}
return 0;
}
static void uniphier_console_init(uintptr_t base)
{
mmio_write_32(base + UNIPHIER_UART_FCR, UNIPHIER_UART_FCR_ENABLE_FIFO);
mmio_write_32(base + UNIPHIER_UART_LCR_MCR,
UNIPHIER_UART_LCR_WLEN8 << 8);
}
void uniphier_console_setup(unsigned int soc)
{
uintptr_t base;
base = uniphier_console_get_base(soc);
if (!base)
plat_error_handler(-EINVAL);
uniphier_console.base = base;
console_register(&uniphier_console);
/*
* The hardware might be still printing characters queued up in the
* previous firmware stage. Make sure the transmitter is empty before
* any initialization. Otherwise, the console might get corrupted.
*/
console_flush();
uniphier_console_init(base);
}
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