Ishizaki Kou | 3cdc20e | 2007-02-02 16:44:08 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Beat hypervisor console driver |
| 3 | * |
| 4 | * (C) Copyright 2006 TOSHIBA CORPORATION |
| 5 | * |
| 6 | * This code is based on drivers/char/hvc_rtas.c: |
| 7 | * (C) Copyright IBM Corporation 2001-2005 |
| 8 | * (C) Copyright Red Hat, Inc. 2005 |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License along |
| 21 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 22 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 23 | */ |
| 24 | |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/err.h> |
| 28 | #include <linux/string.h> |
| 29 | #include <linux/console.h> |
| 30 | #include <asm/prom.h> |
| 31 | #include <asm/hvconsole.h> |
| 32 | #include <asm/firmware.h> |
| 33 | |
| 34 | #include "hvc_console.h" |
| 35 | |
| 36 | extern int64_t beat_get_term_char(uint64_t, uint64_t *, uint64_t *, uint64_t *); |
| 37 | extern int64_t beat_put_term_char(uint64_t, uint64_t, uint64_t, uint64_t); |
| 38 | |
| 39 | struct hvc_struct *hvc_beat_dev = NULL; |
| 40 | |
| 41 | /* bug: only one queue is available regardless of vtermno */ |
| 42 | static int hvc_beat_get_chars(uint32_t vtermno, char *buf, int cnt) |
| 43 | { |
| 44 | static unsigned char q[sizeof(unsigned long) * 2] |
| 45 | __attribute__((aligned(sizeof(unsigned long)))); |
| 46 | static int qlen = 0; |
Ingo Molnar | 19b0bd0 | 2009-01-06 14:01:23 +0000 | [diff] [blame] | 47 | u64 got; |
Ishizaki Kou | 3cdc20e | 2007-02-02 16:44:08 +0900 | [diff] [blame] | 48 | |
| 49 | again: |
| 50 | if (qlen) { |
| 51 | if (qlen > cnt) { |
| 52 | memcpy(buf, q, cnt); |
| 53 | qlen -= cnt; |
| 54 | memmove(q + cnt, q, qlen); |
| 55 | return cnt; |
| 56 | } else { /* qlen <= cnt */ |
| 57 | int r; |
| 58 | |
| 59 | memcpy(buf, q, qlen); |
| 60 | r = qlen; |
| 61 | qlen = 0; |
| 62 | return r; |
| 63 | } |
| 64 | } |
| 65 | if (beat_get_term_char(vtermno, &got, |
Ingo Molnar | 19b0bd0 | 2009-01-06 14:01:23 +0000 | [diff] [blame] | 66 | ((u64 *)q), ((u64 *)q) + 1) == 0) { |
Ishizaki Kou | 3cdc20e | 2007-02-02 16:44:08 +0900 | [diff] [blame] | 67 | qlen = got; |
| 68 | goto again; |
| 69 | } |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static int hvc_beat_put_chars(uint32_t vtermno, const char *buf, int cnt) |
| 74 | { |
| 75 | unsigned long kb[2]; |
| 76 | int rest, nlen; |
| 77 | |
| 78 | for (rest = cnt; rest > 0; rest -= nlen) { |
| 79 | nlen = (rest > 16) ? 16 : rest; |
| 80 | memcpy(kb, buf, nlen); |
Ishizaki Kou | 55045d4 | 2008-03-17 21:05:18 +1100 | [diff] [blame] | 81 | beat_put_term_char(vtermno, nlen, kb[0], kb[1]); |
| 82 | buf += nlen; |
Ishizaki Kou | 3cdc20e | 2007-02-02 16:44:08 +0900 | [diff] [blame] | 83 | } |
| 84 | return cnt; |
| 85 | } |
| 86 | |
| 87 | static struct hv_ops hvc_beat_get_put_ops = { |
| 88 | .get_chars = hvc_beat_get_chars, |
| 89 | .put_chars = hvc_beat_put_chars, |
| 90 | }; |
| 91 | |
| 92 | static int hvc_beat_useit = 1; |
| 93 | |
| 94 | static int hvc_beat_config(char *p) |
| 95 | { |
| 96 | hvc_beat_useit = simple_strtoul(p, NULL, 0); |
| 97 | return 0; |
| 98 | } |
| 99 | |
Ishizaki Kou | 301d9cb | 2007-07-26 20:06:08 +1000 | [diff] [blame] | 100 | static int __init hvc_beat_console_init(void) |
Ishizaki Kou | 3cdc20e | 2007-02-02 16:44:08 +0900 | [diff] [blame] | 101 | { |
Grant Likely | 71a157e | 2010-02-01 21:34:14 -0700 | [diff] [blame^] | 102 | if (hvc_beat_useit && of_machine_is_compatible("Beat")) { |
Ishizaki Kou | 3cdc20e | 2007-02-02 16:44:08 +0900 | [diff] [blame] | 103 | hvc_instantiate(0, 0, &hvc_beat_get_put_ops); |
| 104 | } |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | /* temp */ |
Ishizaki Kou | 301d9cb | 2007-07-26 20:06:08 +1000 | [diff] [blame] | 109 | static int __init hvc_beat_init(void) |
Ishizaki Kou | 3cdc20e | 2007-02-02 16:44:08 +0900 | [diff] [blame] | 110 | { |
| 111 | struct hvc_struct *hp; |
| 112 | |
| 113 | if (!firmware_has_feature(FW_FEATURE_BEAT)) |
| 114 | return -ENODEV; |
| 115 | |
| 116 | hp = hvc_alloc(0, NO_IRQ, &hvc_beat_get_put_ops, 16); |
| 117 | if (IS_ERR(hp)) |
| 118 | return PTR_ERR(hp); |
| 119 | hvc_beat_dev = hp; |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | static void __exit hvc_beat_exit(void) |
| 124 | { |
| 125 | if (hvc_beat_dev) |
| 126 | hvc_remove(hvc_beat_dev); |
| 127 | } |
| 128 | |
| 129 | module_init(hvc_beat_init); |
| 130 | module_exit(hvc_beat_exit); |
| 131 | |
| 132 | __setup("hvc_beat=", hvc_beat_config); |
| 133 | |
| 134 | console_initcall(hvc_beat_console_init); |