diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/hvc/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/tty/hvc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/tty/hvc/hvc_riscv_sbi.c | 60 |
3 files changed, 71 insertions, 0 deletions
diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig index fec457edad14..e7cc617d6e45 100644 --- a/drivers/tty/hvc/Kconfig +++ b/drivers/tty/hvc/Kconfig @@ -97,6 +97,16 @@ config HVC_BFIN_JTAG the HVC driver. If you don't have JTAG, then you probably don't want this option. +config HVC_RISCV_SBI + bool "RISC-V SBI console support" + depends on RISCV + select HVC_DRIVER + help + This enables support for console output via RISC-V SBI calls, which + is normally used only during boot to output printk. + + If you don't know what do to here, say Y. + config HVCS tristate "IBM Hypervisor Virtual Console Server support" depends on PPC_PSERIES && HVC_CONSOLE diff --git a/drivers/tty/hvc/Makefile b/drivers/tty/hvc/Makefile index 0b02ec7f1dfd..83079ae000ae 100644 --- a/drivers/tty/hvc/Makefile +++ b/drivers/tty/hvc/Makefile @@ -11,4 +11,5 @@ obj-$(CONFIG_HVC_XEN) += hvc_xen.o obj-$(CONFIG_HVC_IUCV) += hvc_iucv.o obj-$(CONFIG_HVC_UDBG) += hvc_udbg.o obj-$(CONFIG_HVC_BFIN_JTAG) += hvc_bfin_jtag.o +obj-$(CONFIG_HVC_RISCV_SBI) += hvc_riscv_sbi.o obj-$(CONFIG_HVCS) += hvcs.o diff --git a/drivers/tty/hvc/hvc_riscv_sbi.c b/drivers/tty/hvc/hvc_riscv_sbi.c new file mode 100644 index 000000000000..75155bde2b88 --- /dev/null +++ b/drivers/tty/hvc/hvc_riscv_sbi.c @@ -0,0 +1,60 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2008 David Gibson, IBM Corporation + * Copyright (C) 2012 Regents of the University of California + * Copyright (C) 2017 SiFive + */ + +#include <linux/console.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/moduleparam.h> +#include <linux/types.h> + +#include <asm/sbi.h> + +#include "hvc_console.h" + +static int hvc_sbi_tty_put(uint32_t vtermno, const char *buf, int count) +{ + int i; + + for (i = 0; i < count; i++) + sbi_console_putchar(buf[i]); + + return i; +} + +static int hvc_sbi_tty_get(uint32_t vtermno, char *buf, int count) +{ + int i, c; + + for (i = 0; i < count; i++) { + c = sbi_console_getchar(); + if (c < 0) + break; + buf[i] = c; + } + + return i; +} + +static const struct hv_ops hvc_sbi_ops = { + .get_chars = hvc_sbi_tty_get, + .put_chars = hvc_sbi_tty_put, +}; + +static int __init hvc_sbi_init(void) +{ + return PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_ops, 16)); +} +device_initcall(hvc_sbi_init); + +static int __init hvc_sbi_console_init(void) +{ + hvc_instantiate(0, 0, &hvc_sbi_ops); + add_preferred_console("hvc", 0, NULL); + + return 0; +} +console_initcall(hvc_sbi_console_init); |