6b5bc77c9b
Stefan thinks they don't add value. Command used: sed -i -e '/file is part of /d' $(git grep "file is part of " |egrep ":( */\*.*\*/\$|#|;#|-- | *\* )" | cut -d: -f1 |grep -v crossgcc |grep -v gcov | grep -v /elf.h |grep -v nvramtool) The exceptions are for: - crossgcc (patch file) - gcov (imported from gcc) - elf.h (imported from GNU's libc) - nvramtool (more complicated header) The removed lines are: - fmt.Fprintln(f, "/* This file is part of the coreboot project. */") -# This file is part of a set of unofficial pre-commit hooks available -/* This file is part of coreboot */ -# This file is part of msrtool. -/* This file is part of msrtool. */ - * This file is part of ncurses, designed to be appended after curses.h.in -/* This file is part of pgtblgen. */ - * This file is part of the coreboot project. - /* This file is part of the coreboot project. */ -# This file is part of the coreboot project. -# This file is part of the coreboot project. -## This file is part of the coreboot project. --- This file is part of the coreboot project. -/* This file is part of the coreboot project */ -/* This file is part of the coreboot project. */ -;## This file is part of the coreboot project. -# This file is part of the coreboot project. It originated in the - * This file is part of the coreinfo project. -## This file is part of the coreinfo project. - * This file is part of the depthcharge project. -/* This file is part of the depthcharge project. */ -/* This file is part of the ectool project. */ - * This file is part of the GNU C Library. - * This file is part of the libpayload project. -## This file is part of the libpayload project. -/* This file is part of the Linux kernel. */ -## This file is part of the superiotool project. -/* This file is part of the superiotool project */ -/* This file is part of uio_usbdebug */ Change-Id: I82d872b3b337388c93d5f5bf704e9ee9e53ab3a9 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/41194 Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include <console/uart.h>
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#include <types.h>
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#include <timer.h>
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/* Calculate divisor. Do not floor but round to nearest integer. */
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unsigned int uart_baudrate_divisor(unsigned int baudrate,
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unsigned int refclk, unsigned int oversample)
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{
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return (1 + (2 * refclk) / (baudrate * oversample)) / 2;
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}
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#if !CONFIG(UART_OVERRIDE_INPUT_CLOCK_DIVIDER)
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unsigned int uart_input_clock_divider(void)
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{
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/* Specify the default oversample rate for the UART.
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*
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* UARTs oversample the receive data. The UART's input clock first
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* enters the baud-rate divider to generate the oversample clock. Then
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* the UART typically divides the result by 16. The asynchronous
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* receive data is synchronized with the oversample clock and when a
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* start bit is detected the UART delays half a bit time using the
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* oversample clock. Samples are then taken to verify the start bit and
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* if present, samples are taken for the rest of the frame.
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*/
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return 16;
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}
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#endif
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#if !CONFIG(UART_OVERRIDE_REFCLK)
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unsigned int uart_platform_refclk(void)
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{
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/* Specify the default input clock frequency for the UART.
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*
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* The older UART's used an input clock frequency of 1.8432 MHz which
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* with the 16x oversampling provided the maximum baud-rate of 115200.
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* Specify this as maximum baud-rate multiplied by oversample so that
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* it is obvious that the maximum baud rate is 115200 when divided by
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* oversample clock. Also note that crystal on the board does not
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* change when software selects another input clock divider.
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*/
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return 115200 * 16;
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}
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#endif
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/* Helper function to allow bitbanging an 8n1 UART. */
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void uart_bitbang_tx_byte(unsigned char data, void (*set_tx)(int line_state))
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{
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const int baud_rate = get_uart_baudrate();
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int i;
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struct stopwatch sw;
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stopwatch_init(&sw);
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/* Send start bit */
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set_tx(0);
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while (stopwatch_duration_usecs(&sw) < MHz / baud_rate)
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stopwatch_tick(&sw);
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/* 'i' counts the total bits sent at the end of the loop */
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for (i = 2; i < 10; i++) {
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set_tx(data & 1);
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data >>= 1;
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while (stopwatch_duration_usecs(&sw) < i * MHz / baud_rate)
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stopwatch_tick(&sw);
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}
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/* Send stop bit */
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set_tx(1);
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while (stopwatch_duration_usecs(&sw) < i * MHz / baud_rate)
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stopwatch_tick(&sw);
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}
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