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Diffstat (limited to 'drivers/char/hvc_dcc.c')
-rw-r--r--drivers/char/hvc_dcc.c133
1 files changed, 0 insertions, 133 deletions
diff --git a/drivers/char/hvc_dcc.c b/drivers/char/hvc_dcc.c
deleted file mode 100644
index 6470f63deb4b..000000000000
--- a/drivers/char/hvc_dcc.c
+++ /dev/null
@@ -1,133 +0,0 @@
1/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
15 * 02110-1301, USA.
16 */
17
18#include <linux/console.h>
19#include <linux/delay.h>
20#include <linux/err.h>
21#include <linux/init.h>
22#include <linux/moduleparam.h>
23#include <linux/types.h>
24
25#include <asm/processor.h>
26
27#include "hvc_console.h"
28
29/* DCC Status Bits */
30#define DCC_STATUS_RX (1 << 30)
31#define DCC_STATUS_TX (1 << 29)
32
33static inline u32 __dcc_getstatus(void)
34{
35 u32 __ret;
36
37 asm("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg"
38 : "=r" (__ret) : : "cc");
39
40 return __ret;
41}
42
43
44#if defined(CONFIG_CPU_V7)
45static inline char __dcc_getchar(void)
46{
47 char __c;
48
49 asm("get_wait: mrc p14, 0, pc, c0, c1, 0 \n\
50 bne get_wait \n\
51 mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
52 : "=r" (__c) : : "cc");
53
54 return __c;
55}
56#else
57static inline char __dcc_getchar(void)
58{
59 char __c;
60
61 asm("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
62 : "=r" (__c));
63
64 return __c;
65}
66#endif
67
68#if defined(CONFIG_CPU_V7)
69static inline void __dcc_putchar(char c)
70{
71 asm("put_wait: mrc p14, 0, pc, c0, c1, 0 \n\
72 bcs put_wait \n\
73 mcr p14, 0, %0, c0, c5, 0 "
74 : : "r" (c) : "cc");
75}
76#else
77static inline void __dcc_putchar(char c)
78{
79 asm("mcr p14, 0, %0, c0, c5, 0 @ write a char"
80 : /* no output register */
81 : "r" (c));
82}
83#endif
84
85static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
86{
87 int i;
88
89 for (i = 0; i < count; i++) {
90 while (__dcc_getstatus() & DCC_STATUS_TX)
91 cpu_relax();
92
93 __dcc_putchar((char)(buf[i] & 0xFF));
94 }
95
96 return count;
97}
98
99static int hvc_dcc_get_chars(uint32_t vt, char *buf, int count)
100{
101 int i;
102
103 for (i = 0; i < count; ++i) {
104 int c = -1;
105
106 if (__dcc_getstatus() & DCC_STATUS_RX)
107 c = __dcc_getchar();
108 if (c < 0)
109 break;
110 buf[i] = c;
111 }
112
113 return i;
114}
115
116static const struct hv_ops hvc_dcc_get_put_ops = {
117 .get_chars = hvc_dcc_get_chars,
118 .put_chars = hvc_dcc_put_chars,
119};
120
121static int __init hvc_dcc_console_init(void)
122{
123 hvc_instantiate(0, 0, &hvc_dcc_get_put_ops);
124 return 0;
125}
126console_initcall(hvc_dcc_console_init);
127
128static int __init hvc_dcc_init(void)
129{
130 hvc_alloc(0, 0, &hvc_dcc_get_put_ops, 128);
131 return 0;
132}
133device_initcall(hvc_dcc_init);