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https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
At present devices use a simple integer offset to record the device tree node associated with the device. In preparation for supporting a live device tree, which uses a node pointer instead, refactor existing code to access this field through an inline function. Signed-off-by: Simon Glass <sjg@chromium.org>
201 lines
4.4 KiB
C
201 lines
4.4 KiB
C
/*
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* Copyright (c) 2011 The Chromium OS Authors.
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*
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* SPDX-License-Identifier: GPL-2.0+
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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 <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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/*
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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 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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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_no_block(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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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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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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};
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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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