| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * udbg interface to hvc_console.c |
| * |
| * (C) Copyright David Gibson, IBM Corporation 2008. |
| */ |
| |
| #include <linux/console.h> |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| #include <linux/init.h> |
| #include <linux/moduleparam.h> |
| #include <linux/types.h> |
| #include <linux/irq.h> |
| |
| #include <asm/udbg.h> |
| |
| #include "hvc_console.h" |
| |
| struct hvc_struct *hvc_udbg_dev; |
| |
| static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count) |
| { |
| int i; |
| |
| for (i = 0; i < count && udbg_putc; i++) |
| udbg_putc(buf[i]); |
| |
| return i; |
| } |
| |
| static int hvc_udbg_get(uint32_t vtermno, char *buf, int count) |
| { |
| int i, c; |
| |
| if (!udbg_getc_poll) |
| return 0; |
| |
| for (i = 0; i < count; i++) { |
| if ((c = udbg_getc_poll()) == -1) |
| break; |
| buf[i] = c; |
| } |
| |
| return i; |
| } |
| |
| static const struct hv_ops hvc_udbg_ops = { |
| .get_chars = hvc_udbg_get, |
| .put_chars = hvc_udbg_put, |
| }; |
| |
| static int __init hvc_udbg_init(void) |
| { |
| struct hvc_struct *hp; |
| |
| if (!udbg_putc) |
| return -ENODEV; |
| |
| BUG_ON(hvc_udbg_dev); |
| |
| hp = hvc_alloc(0, 0, &hvc_udbg_ops, 16); |
| if (IS_ERR(hp)) |
| return PTR_ERR(hp); |
| |
| hvc_udbg_dev = hp; |
| |
| return 0; |
| } |
| device_initcall(hvc_udbg_init); |
| |
| static int __init hvc_udbg_console_init(void) |
| { |
| if (!udbg_putc) |
| return -ENODEV; |
| |
| hvc_instantiate(0, 0, &hvc_udbg_ops); |
| add_preferred_console("hvc", 0, NULL); |
| |
| return 0; |
| } |
| console_initcall(hvc_udbg_console_init); |