mirror of
https://github.com/AsahiLinux/u-boot
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2332590c48
If semihosting is disabled, then the user has no debugger attached, and will not see any messages. Don't create a serial device in this instance, to (hopefully) fall back on another working serial device. Signed-off-by: Sean Anderson <sean.anderson@seco.com>
156 lines
2.6 KiB
C
156 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2022 Sean Anderson <sean.anderson@seco.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <serial.h>
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#include <semihosting.h>
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/**
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* struct smh_serial_priv - Semihosting serial private data
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* @infd: stdin file descriptor (or error)
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*/
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struct smh_serial_priv {
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int infd;
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int outfd;
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};
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#if CONFIG_IS_ENABLED(DM_SERIAL)
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static int smh_serial_getc(struct udevice *dev)
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{
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char ch = 0;
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struct smh_serial_priv *priv = dev_get_priv(dev);
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if (priv->infd < 0)
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return smh_getc();
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smh_read(priv->infd, &ch, sizeof(ch));
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return ch;
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}
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static int smh_serial_putc(struct udevice *dev, const char ch)
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{
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smh_putc(ch);
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return 0;
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}
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static const struct dm_serial_ops smh_serial_ops = {
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.putc = smh_serial_putc,
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.getc = smh_serial_getc,
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};
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static int smh_serial_bind(struct udevice *dev)
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{
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if (semihosting_enabled())
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return 0;
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return -ENOENT;
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}
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static int smh_serial_probe(struct udevice *dev)
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{
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struct smh_serial_priv *priv = dev_get_priv(dev);
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priv->infd = smh_open(":tt", MODE_READ);
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return 0;
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}
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U_BOOT_DRIVER(smh_serial) = {
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.name = "serial_semihosting",
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.id = UCLASS_SERIAL,
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.bind = smh_serial_bind,
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.probe = smh_serial_probe,
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.priv_auto = sizeof(struct smh_serial_priv),
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.ops = &smh_serial_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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U_BOOT_DRVINFO(smh_serial) = {
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.name = "serial_semihosting",
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};
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#else /* DM_SERIAL */
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static int infd = -ENODEV;
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static int outfd = -ENODEV;
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static int smh_serial_start(void)
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{
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infd = smh_open(":tt", MODE_READ);
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outfd = smh_open(":tt", MODE_WRITE);
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return 0;
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}
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static int smh_serial_stop(void)
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{
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if (outfd >= 0)
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smh_close(outfd);
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return 0;
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}
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static void smh_serial_setbrg(void)
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{
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}
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static int smh_serial_getc(void)
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{
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char ch = 0;
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if (infd < 0)
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return smh_getc();
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smh_read(infd, &ch, sizeof(ch));
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return ch;
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}
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static int smh_serial_tstc(void)
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{
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return 1;
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}
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static void smh_serial_puts(const char *s)
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{
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ulong unused;
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if (outfd < 0)
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smh_puts(s);
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else
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smh_write(outfd, s, strlen(s), &unused);
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}
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struct serial_device serial_smh_device = {
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.name = "serial_smh",
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.start = smh_serial_start,
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.stop = smh_serial_stop,
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.setbrg = smh_serial_setbrg,
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.getc = smh_serial_getc,
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.tstc = smh_serial_tstc,
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.putc = smh_putc,
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.puts = smh_serial_puts,
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};
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void smh_serial_initialize(void)
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{
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if (semihosting_enabled())
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serial_register(&serial_smh_device);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &serial_smh_device;
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}
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#endif
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#ifdef CONFIG_DEBUG_UART_SEMIHOSTING
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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 c)
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{
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smh_putc(c);
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}
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DEBUG_UART_FUNCS
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#endif
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