diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/serial/Kconfig | 35 | ||||
| -rw-r--r-- | drivers/serial/Makefile | 1 | ||||
| -rw-r--r-- | drivers/serial/serial-uclass.c | 26 | ||||
| -rw-r--r-- | drivers/serial/serial.c | 2 | ||||
| -rw-r--r-- | drivers/serial/serial_semihosting.c | 156 |
5 files changed, 218 insertions, 2 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index 610f8062c76..76171e7146a 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -133,6 +133,19 @@ config SERIAL_RX_BUFFER_SIZE help The size of the RX buffer (needs to be power of 2) +config SERIAL_PUTS + bool "Enable printing strings all at once" + depends on DM_SERIAL + help + Some serial drivers are much more efficient when printing multiple + characters at once rather than printing characters individually. This + can be because they can load a fifo, or because individual print + calls have a constant overhead. With this option set, the serial + subsystem will try to provide serial drivers with as many characters + at once as possible, instead of printing characters one by one. Most + serial drivers do not need this config to print efficiently. If + unsure, say N. + config SERIAL_SEARCH_ALL bool "Search for serial devices after default one failed" depends on DM_SERIAL @@ -399,6 +412,15 @@ config DEBUG_UART_SANDBOX start up driver model. The driver will be available until the real driver model serial is running. +config DEBUG_UART_SEMIHOSTING + bool "semihosting" + depends on SEMIHOSTING_SERIAL + help + Select this to enable the debug UART using the semihosting driver. + This provides basic serial output from the console without needing to + start up driver model. The driver will be available until the real + driver model serial is running. + config DEBUG_UART_SIFIVE bool "SiFive UART" depends on SIFIVE_SERIAL @@ -782,6 +804,19 @@ config SCIF_CONSOLE on systems with RCar or SH SoCs, say Y to this option. If unsure, say N. +config SEMIHOSTING_SERIAL + bool "Semihosting UART support" + depends on SEMIHOSTING && !SERIAL_RX_BUFFER + help + Select this to enable a serial UART using semihosting. Special halt + instructions will be issued which an external debugger (such as a + JTAG emulator) may interpret. The debugger will display U-Boot's + console output on the host system. + + Enable this option only if you are using a debugger which supports + semihosting. If you are not using a debugger, this driver will halt + the boot. + config UNIPHIER_SERIAL bool "Support for UniPhier on-chip UART" depends on ARCH_UNIPHIER diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index 52e70aa1917..b68b5e7b2bf 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -52,6 +52,7 @@ endif obj-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o obj-$(CONFIG_SANDBOX_SERIAL) += sandbox.o obj-$(CONFIG_SCIF_CONSOLE) += serial_sh.o +obj-$(CONFIG_SEMIHOSTING_SERIAL) += serial_semihosting.o obj-$(CONFIG_ZYNQ_SERIAL) += serial_zynq.o obj-$(CONFIG_FSL_LPUART) += serial_lpuart.o obj-$(CONFIG_FSL_LINFLEXUART) += serial_linflexuart.o diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c index f30f352bd7a..10d6b800e2f 100644 --- a/drivers/serial/serial-uclass.c +++ b/drivers/serial/serial-uclass.c @@ -200,8 +200,30 @@ static void _serial_putc(struct udevice *dev, char ch) static void _serial_puts(struct udevice *dev, const char *str) { - while (*str) - _serial_putc(dev, *str++); + struct dm_serial_ops *ops = serial_get_ops(dev); + + if (!CONFIG_IS_ENABLED(SERIAL_PUTS) || !ops->puts) { + while (*str) + _serial_putc(dev, *str++); + return; + } + + do { + const char *newline = strchrnul(str, '\n'); + size_t len = newline - str + !!*newline; + + do { + ssize_t written = ops->puts(dev, str, len); + + if (written < 0) + return; + str += written; + len -= written; + } while (len); + + if (*newline) + _serial_putc(dev, '\r'); + } while (*str); } static int __serial_getc(struct udevice *dev) diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c index ebbd21916d7..6cdbb89841c 100644 --- a/drivers/serial/serial.c +++ b/drivers/serial/serial.c @@ -126,6 +126,7 @@ serial_initfunc(mxc_serial_initialize); serial_initfunc(ns16550_serial_initialize); serial_initfunc(pl01x_serial_initialize); serial_initfunc(pxa_serial_initialize); +serial_initfunc(smh_serial_initialize); serial_initfunc(sh_serial_initialize); serial_initfunc(mtk_serial_initialize); @@ -180,6 +181,7 @@ int serial_initialize(void) ns16550_serial_initialize(); pl01x_serial_initialize(); pxa_serial_initialize(); + smh_serial_initialize(); sh_serial_initialize(); mtk_serial_initialize(); diff --git a/drivers/serial/serial_semihosting.c b/drivers/serial/serial_semihosting.c new file mode 100644 index 00000000000..62b1b2241b3 --- /dev/null +++ b/drivers/serial/serial_semihosting.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2022 Sean Anderson <sean.anderson@seco.com> + */ + +#include <common.h> +#include <dm.h> +#include <serial.h> +#include <semihosting.h> + +/** + * struct smh_serial_priv - Semihosting serial private data + * @infd: stdin file descriptor (or error) + */ +struct smh_serial_priv { + int infd; + int outfd; +}; + +#if CONFIG_IS_ENABLED(DM_SERIAL) +static int smh_serial_getc(struct udevice *dev) +{ + char ch = 0; + struct smh_serial_priv *priv = dev_get_priv(dev); + + if (priv->infd < 0) + return smh_getc(); + + smh_read(priv->infd, &ch, sizeof(ch)); + return ch; +} + +static int smh_serial_putc(struct udevice *dev, const char ch) +{ + smh_putc(ch); + return 0; +} + +static const struct dm_serial_ops smh_serial_ops = { + .putc = smh_serial_putc, + .getc = smh_serial_getc, +}; + +static int smh_serial_bind(struct udevice *dev) +{ + if (semihosting_enabled()) + return 0; + return -ENOENT; +} + +static int smh_serial_probe(struct udevice *dev) +{ + struct smh_serial_priv *priv = dev_get_priv(dev); + + priv->infd = smh_open(":tt", MODE_READ); + return 0; +} + +U_BOOT_DRIVER(smh_serial) = { + .name = "serial_semihosting", + .id = UCLASS_SERIAL, + .bind = smh_serial_bind, + .probe = smh_serial_probe, + .priv_auto = sizeof(struct smh_serial_priv), + .ops = &smh_serial_ops, + .flags = DM_FLAG_PRE_RELOC, +}; + +U_BOOT_DRVINFO(smh_serial) = { + .name = "serial_semihosting", +}; +#else /* DM_SERIAL */ +static int infd = -ENODEV; +static int outfd = -ENODEV; + +static int smh_serial_start(void) +{ + infd = smh_open(":tt", MODE_READ); + outfd = smh_open(":tt", MODE_WRITE); + return 0; +} + +static int smh_serial_stop(void) +{ + if (outfd >= 0) + smh_close(outfd); + return 0; +} + +static void smh_serial_setbrg(void) +{ +} + +static int smh_serial_getc(void) +{ + char ch = 0; + + if (infd < 0) + return smh_getc(); + + smh_read(infd, &ch, sizeof(ch)); + return ch; +} + +static int smh_serial_tstc(void) +{ + return 1; +} + +static void smh_serial_puts(const char *s) +{ + ulong unused; + + if (outfd < 0) + smh_puts(s); + else + smh_write(outfd, s, strlen(s), &unused); +} + +struct serial_device serial_smh_device = { + .name = "serial_smh", + .start = smh_serial_start, + .stop = smh_serial_stop, + .setbrg = smh_serial_setbrg, + .getc = smh_serial_getc, + .tstc = smh_serial_tstc, + .putc = smh_putc, + .puts = smh_serial_puts, +}; + +void smh_serial_initialize(void) +{ + if (semihosting_enabled()) + serial_register(&serial_smh_device); +} + +__weak struct serial_device *default_serial_console(void) +{ + return &serial_smh_device; +} +#endif + +#ifdef CONFIG_DEBUG_UART_SEMIHOSTING +#include <debug_uart.h> + +static inline void _debug_uart_init(void) +{ +} + +static inline void _debug_uart_putc(int c) +{ + smh_putc(c); +} + +DEBUG_UART_FUNCS +#endif |