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https://github.com/brain-hackers/u-boot-brain
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![Andy Shevchenko](/assets/img/avatar_default.png)
Some callers of serial_getinfo() would like to know the UART base clock speed in order to make decision what to pass to OS in some cases. In particular, ACPI SPCR table expects only certain base clock speed and thus we have to act accordingly. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
277 lines
5.9 KiB
C
277 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2011 The Chromium OS Authors.
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*/
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/*
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* This provide a test serial port. It provides an emulated serial port where
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* a test program and read out the serial output and inject serial input for
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* U-Boot.
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*/
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#include <common.h>
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#include <console.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <lcd.h>
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#include <os.h>
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#include <serial.h>
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#include <video.h>
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#include <linux/compiler.h>
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#include <asm/state.h>
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DECLARE_GLOBAL_DATA_PTR;
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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/*
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*
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* serial_buf: A buffer that holds keyboard characters for the
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* Sandbox U-Boot.
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*
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* invariants:
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* serial_buf_write == serial_buf_read -> empty buffer
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* (serial_buf_write + 1) % 16 == serial_buf_read -> full buffer
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*/
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static unsigned char serial_buf[16];
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static unsigned int serial_buf_write;
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static unsigned int serial_buf_read;
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struct sandbox_serial_platdata {
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int colour; /* Text colour to use for output, -1 for none */
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};
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struct sandbox_serial_priv {
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bool start_of_line;
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};
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/**
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* output_ansi_colour() - Output an ANSI colour code
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*
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* @colour: Colour to output (0-7)
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*/
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static void output_ansi_colour(int colour)
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{
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char ansi_code[] = "\x1b[1;3Xm";
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ansi_code[5] = '0' + colour;
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os_write(1, ansi_code, sizeof(ansi_code) - 1);
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}
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static void output_ansi_reset(void)
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{
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os_write(1, "\x1b[0m", 4);
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}
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static int sandbox_serial_probe(struct udevice *dev)
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{
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struct sandbox_state *state = state_get_current();
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struct sandbox_serial_priv *priv = dev_get_priv(dev);
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if (state->term_raw != STATE_TERM_COOKED)
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os_tty_raw(0, state->term_raw == STATE_TERM_RAW_WITH_SIGS);
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priv->start_of_line = 0;
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if (state->term_raw != STATE_TERM_RAW)
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disable_ctrlc(1);
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return 0;
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}
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static int sandbox_serial_remove(struct udevice *dev)
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{
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struct sandbox_serial_platdata *plat = dev->platdata;
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if (plat->colour != -1)
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output_ansi_reset();
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return 0;
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}
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static int sandbox_serial_putc(struct udevice *dev, const char ch)
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{
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struct sandbox_serial_priv *priv = dev_get_priv(dev);
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struct sandbox_serial_platdata *plat = dev->platdata;
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if (priv->start_of_line && plat->colour != -1) {
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priv->start_of_line = false;
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output_ansi_colour(plat->colour);
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}
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os_write(1, &ch, 1);
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if (ch == '\n')
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priv->start_of_line = true;
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return 0;
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}
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static unsigned int increment_buffer_index(unsigned int index)
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{
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return (index + 1) % ARRAY_SIZE(serial_buf);
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}
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static int sandbox_serial_pending(struct udevice *dev, bool input)
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{
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const unsigned int next_index =
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increment_buffer_index(serial_buf_write);
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ssize_t count;
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if (!input)
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return 0;
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os_usleep(100);
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#ifndef CONFIG_SPL_BUILD
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video_sync_all();
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#endif
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if (next_index == serial_buf_read)
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return 1; /* buffer full */
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count = os_read(0, &serial_buf[serial_buf_write], 1);
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if (count == 1)
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serial_buf_write = next_index;
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return serial_buf_write != serial_buf_read;
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}
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static int sandbox_serial_getc(struct udevice *dev)
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{
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int result;
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if (!sandbox_serial_pending(dev, true))
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return -EAGAIN; /* buffer empty */
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result = serial_buf[serial_buf_read];
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serial_buf_read = increment_buffer_index(serial_buf_read);
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return result;
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}
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#endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
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#ifdef CONFIG_DEBUG_UART_SANDBOX
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#include <debug_uart.h>
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static inline void _debug_uart_init(void)
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{
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}
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static inline void _debug_uart_putc(int ch)
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{
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os_putc(ch);
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}
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DEBUG_UART_FUNCS
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#endif /* CONFIG_DEBUG_UART_SANDBOX */
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static int sandbox_serial_getconfig(struct udevice *dev, uint *serial_config)
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{
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uint config = SERIAL_DEFAULT_CONFIG;
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if (!serial_config)
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return -EINVAL;
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*serial_config = config;
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return 0;
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}
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static int sandbox_serial_setconfig(struct udevice *dev, uint serial_config)
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{
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u8 parity = SERIAL_GET_PARITY(serial_config);
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u8 bits = SERIAL_GET_BITS(serial_config);
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u8 stop = SERIAL_GET_STOP(serial_config);
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if (bits != SERIAL_8_BITS || stop != SERIAL_ONE_STOP ||
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parity != SERIAL_PAR_NONE)
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return -ENOTSUPP; /* not supported in driver*/
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return 0;
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}
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static int sandbox_serial_getinfo(struct udevice *dev,
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struct serial_device_info *serial_info)
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{
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struct serial_device_info info = {
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.type = SERIAL_CHIP_UNKNOWN,
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.addr_space = SERIAL_ADDRESS_SPACE_IO,
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.addr = SERIAL_DEFAULT_ADDRESS,
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.reg_width = 1,
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.reg_offset = 0,
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.reg_shift = 0,
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.clock = SERIAL_DEFAULT_CLOCK,
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};
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if (!serial_info)
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return -EINVAL;
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*serial_info = info;
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return 0;
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}
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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static const char * const ansi_colour[] = {
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"black", "red", "green", "yellow", "blue", "megenta", "cyan",
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"white",
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};
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static int sandbox_serial_ofdata_to_platdata(struct udevice *dev)
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{
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struct sandbox_serial_platdata *plat = dev->platdata;
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const char *colour;
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int i;
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if (CONFIG_IS_ENABLED(OF_PLATDATA))
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return 0;
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plat->colour = -1;
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colour = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
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"sandbox,text-colour", NULL);
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if (colour) {
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for (i = 0; i < ARRAY_SIZE(ansi_colour); i++) {
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if (!strcmp(colour, ansi_colour[i])) {
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plat->colour = i;
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break;
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}
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}
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}
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return 0;
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}
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static const struct dm_serial_ops sandbox_serial_ops = {
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.putc = sandbox_serial_putc,
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.pending = sandbox_serial_pending,
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.getc = sandbox_serial_getc,
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.getconfig = sandbox_serial_getconfig,
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.setconfig = sandbox_serial_setconfig,
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.getinfo = sandbox_serial_getinfo,
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};
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static const struct udevice_id sandbox_serial_ids[] = {
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{ .compatible = "sandbox,serial" },
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{ }
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};
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U_BOOT_DRIVER(serial_sandbox) = {
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.name = "serial_sandbox",
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.id = UCLASS_SERIAL,
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.of_match = sandbox_serial_ids,
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.ofdata_to_platdata = sandbox_serial_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct sandbox_serial_platdata),
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.priv_auto_alloc_size = sizeof(struct sandbox_serial_priv),
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.probe = sandbox_serial_probe,
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.remove = sandbox_serial_remove,
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.ops = &sandbox_serial_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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static const struct sandbox_serial_platdata platdata_non_fdt = {
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.colour = -1,
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};
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U_BOOT_DEVICE(serial_sandbox_non_fdt) = {
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.name = "serial_sandbox",
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.platdata = &platdata_non_fdt,
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};
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#endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
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