projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d5e54913 DG |
1 | /* |
| 2 | * udbg interface to hvc_console.c | |
| 3 | * | |
| 4 | * (C) Copyright David Gibson, IBM Corporation 2008. | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License as published by | |
| 8 | * the Free Software Foundation; either version 2 of the License, or | |
| 9 | * (at your option) any later version. | |
| 10 | * | |
| 11 | * This program is distributed in the hope that it will be useful, | |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | * GNU General Public License for more details. | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU General Public License | |
| 17 | * along with this program; if not, write to the Free Software | |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 19 | */ | |
| 20 | ||
| 21 | #include <linux/console.h> | |
| 22 | #include <linux/delay.h> | |
| 23 | #include <linux/err.h> | |
| 24 | #include <linux/init.h> | |
| 25 | #include <linux/moduleparam.h> | |
| 26 | #include <linux/types.h> | |
| 27 | #include <linux/irq.h> | |
| 28 | ||
| 29 | #include <asm/udbg.h> | |
| 30 | ||
| 31 | #include "hvc_console.h" | |
| 32 | ||
| 33 | struct hvc_struct *hvc_udbg_dev; | |
| 34 | ||
| 35 | static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count) | |
| 36 | { | |
| 37 | int i; | |
| 38 | ||
| 39 | for (i = 0; i < count; i++) | |
| 40 | udbg_putc(buf[i]); | |
| 41 | ||
| 42 | return i; | |
| 43 | } | |
| 44 | ||
| 45 | static int hvc_udbg_get(uint32_t vtermno, char *buf, int count) | |
| 46 | { | |
| 47 | int i, c; | |
| 48 | ||
| 49 | if (!udbg_getc_poll) | |
| 50 | return 0; | |
| 51 | ||
| 52 | for (i = 0; i < count; i++) { | |
| 53 | if ((c = udbg_getc_poll()) == -1) | |
| 54 | break; | |
| 55 | buf[i] = c; | |
| 56 | } | |
| 57 | ||
| 58 | return i; | |
| 59 | } | |
| 60 | ||
| 61 | static struct hv_ops hvc_udbg_ops = { | |
| 62 | .get_chars = hvc_udbg_get, | |
| 63 | .put_chars = hvc_udbg_put, | |
| 64 | }; | |
| 65 | ||
| 66 | static int __init hvc_udbg_init(void) | |
| 67 | { | |
| 68 | struct hvc_struct *hp; | |
| 69 | ||
| 70 | BUG_ON(hvc_udbg_dev); | |
| 71 | ||
| 72 | hp = hvc_alloc(0, NO_IRQ, &hvc_udbg_ops, 16); | |
| 73 | if (IS_ERR(hp)) | |
| 74 | return PTR_ERR(hp); | |
| 75 | ||
| 76 | hvc_udbg_dev = hp; | |
| 77 | ||
| 78 | return 0; | |
| 79 | } | |
| 80 | module_init(hvc_udbg_init); | |
| 81 | ||
| 82 | static void __exit hvc_udbg_exit(void) | |
| 83 | { | |
| 84 | if (hvc_udbg_dev) | |
| 85 | hvc_remove(hvc_udbg_dev); | |
| 86 | } | |
| 87 | module_exit(hvc_udbg_exit); | |
| 88 | ||
| 89 | static int __init hvc_udbg_console_init(void) | |
| 90 | { | |
| 91 | hvc_instantiate(0, 0, &hvc_udbg_ops); | |
| 92 | add_preferred_console("hvc", 0, NULL); | |
| 93 | ||
| 94 | return 0; | |
| 95 | } | |
| 96 | console_initcall(hvc_udbg_console_init); |