From: Kongou Hikari hikari@nucleisys.com
- This patch supports debug serial and console from SBI syscall.
Signed-off-by: Kongou Hikari hikari@nucleisys.com --- drivers/serial/Kconfig | 17 +++++ drivers/serial/Makefile | 1 + drivers/serial/serial_riscv_sbi.c | 104 ++++++++++++++++++++++++++++++ 3 files changed, 122 insertions(+) create mode 100644 drivers/serial/serial_riscv_sbi.c
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index 90e3983170..60dcf9bc9a 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -388,12 +388,20 @@ config DEBUG_UART_MTK driver will be available until the real driver model serial is running.
+ +config DEBUG_UART_RISCV_SBI + bool "RISC-V SBI CONSOLE" + depends on RISCV_SBI_CONSOLE + help + Select this to enable a debug UART using RISC-V SBI console driver. + endchoice
config DEBUG_UART_BASE hex "Base address of UART" depends on DEBUG_UART default 0 if DEBUG_UART_SANDBOX + default 0 if DEBUG_UART_RISCV_SBI help This is the base address of your UART for memory-mapped UARTs.
@@ -404,6 +412,7 @@ config DEBUG_UART_CLOCK int "UART input clock" depends on DEBUG_UART default 0 if DEBUG_UART_SANDBOX + default 0 if DEBUG_UART_RISCV_SBI help The UART input clock determines the speed of the internal UART circuitry. The baud rate is derived from this by dividing the input @@ -481,6 +490,14 @@ config ALTERA_JTAG_UART_BYPASS output will wait forever until a JTAG terminal is connected. If you not are sure, say Y.
+config RISCV_SBI_CONSOLE + bool "RISC-V SBI console support" + depends on RISCV + help + This enables support for console via RISC-V SBI calls. + + If you don't know what do to here, say Y. + config ALTERA_UART bool "Altera UART support" depends on DM_SERIAL diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index e4a92bbbb7..15b2a3ea6f 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -46,6 +46,7 @@ obj-$(CONFIG_MXC_UART) += serial_mxc.o obj-$(CONFIG_PXA_SERIAL) += serial_pxa.o obj-$(CONFIG_MESON_SERIAL) += serial_meson.o obj-$(CONFIG_INTEL_MID_SERIAL) += serial_intel_mid.o +obj-$(CONFIG_RISCV_SBI_CONSOLE) += serial_riscv_sbi.o ifdef CONFIG_SPL_BUILD obj-$(CONFIG_ROCKCHIP_SERIAL) += serial_rockchip.o endif diff --git a/drivers/serial/serial_riscv_sbi.c b/drivers/serial/serial_riscv_sbi.c new file mode 100644 index 0000000000..add11be04e --- /dev/null +++ b/drivers/serial/serial_riscv_sbi.c @@ -0,0 +1,104 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2008 David Gibson, IBM Corporation + * Copyright (C) 2012 Regents of the University of California + * Copyright (C) 2020 Nuclei System Technologies + * Copyright (C) 2020 Ruigang Wan rgwan@nucleisys.com + */ + +#include <common.h> +#include <serial.h> +#include <errno.h> +#include <dm.h> +#include <fdtdec.h> + +#include <asm/sbi.h> + + +#ifdef CONFIG_DEBUG_UART_RISCV_SBI + +#include <debug_uart.h> + + +static inline void _debug_uart_init(void) +{ + //Nothing +} + +static inline void _debug_uart_putc(int ch) +{ + sbi_console_putchar(ch); +} + +DEBUG_UART_FUNCS + +#endif + +static int sbi_tty_pending_char = -1; + +static int sbi_tty_put(struct udevice *dev, const char ch) +{ + + sbi_console_putchar(ch); + + return 0; +} + +static int sbi_tty_get(struct udevice *dev) +{ + int c; + if (sbi_tty_pending_char != -1) + { + c = sbi_tty_pending_char; + sbi_tty_pending_char = -1; + } + else + { + c = sbi_console_getchar(); + if (c < 0) + return -EAGAIN; + } + + return c; +} + +static int sbi_tty_setbrg(struct udevice *dev, int baudrate) +{ + return 0; +} + +static int sbi_tty_pending(struct udevice *dev, bool input) +{ + int c; + if (input) + { + if (sbi_tty_pending_char != -1) + return 1; + + c = sbi_console_getchar(); + if(c < 0) + return 0; + sbi_tty_pending_char = c; + return 1; + } + return 0; +} + +static const struct udevice_id serial_riscv_sbi_ids[] = { + { .compatible = "sbi,console" }, + { } +}; + +const struct dm_serial_ops serial_riscv_sbi_ops = { + .putc = sbi_tty_put, + .pending = sbi_tty_pending, + .getc = sbi_tty_get, + .setbrg = sbi_tty_setbrg, +}; + +U_BOOT_DRIVER(serial_riscv_sbi) = { + .name = "serial_riscv_sbi", + .id = UCLASS_SERIAL, + .of_match = serial_riscv_sbi_ids, + .ops = &serial_riscv_sbi_ops, +};