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