Release 4.11 drivers/tty/hvc/hvc_dcc.c
/* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/init.h>
#include <asm/dcc.h>
#include <asm/processor.h>
#include "hvc_console.h"
/* DCC Status Bits */
#define DCC_STATUS_RX (1 << 30)
#define DCC_STATUS_TX (1 << 29)
static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
{
int i;
for (i = 0; i < count; i++) {
while (__dcc_getstatus() & DCC_STATUS_TX)
cpu_relax();
__dcc_putchar(buf[i]);
}
return count;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Daniel Walker | 56 | 100.00% | 1 | 100.00% |
| Total | 56 | 100.00% | 1 | 100.00% |
static int hvc_dcc_get_chars(uint32_t vt, char *buf, int count)
{
int i;
for (i = 0; i < count; ++i)
if (__dcc_getstatus() & DCC_STATUS_RX)
buf[i] = __dcc_getchar();
else
break;
return i;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Daniel Walker | 48 | 92.31% | 1 | 50.00% |
| Stephen Boyd | 4 | 7.69% | 1 | 50.00% |
| Total | 52 | 100.00% | 2 | 100.00% |
static bool hvc_dcc_check(void)
{
unsigned long time = jiffies + (HZ / 10);
/* Write a test character to check if it is handled */
__dcc_putchar('\n');
while (time_is_after_jiffies(time)) {
if (!(__dcc_getstatus() & DCC_STATUS_TX))
return true;
}
return false;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Rob Herring | 51 | 100.00% | 1 | 100.00% |
| Total | 51 | 100.00% | 1 | 100.00% |
static const struct hv_ops hvc_dcc_get_put_ops = {
.get_chars = hvc_dcc_get_chars,
.put_chars = hvc_dcc_put_chars,
};
static int __init hvc_dcc_console_init(void)
{
int ret;
if (!hvc_dcc_check())
return -ENODEV;
/* Returns -1 if error */
ret = hvc_instantiate(0, 0, &hvc_dcc_get_put_ops);
return ret < 0 ? -ENODEV : 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Daniel Walker | 22 | 48.89% | 1 | 33.33% |
| Timur Tabi | 13 | 28.89% | 1 | 33.33% |
| Rob Herring | 10 | 22.22% | 1 | 33.33% |
| Total | 45 | 100.00% | 3 | 100.00% |
console_initcall(hvc_dcc_console_init);
static int __init hvc_dcc_init(void)
{
struct hvc_struct *p;
if (!hvc_dcc_check())
return -ENODEV;
p = hvc_alloc(0, 0, &hvc_dcc_get_put_ops, 128);
return PTR_ERR_OR_ZERO(p);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Daniel Walker | 23 | 52.27% | 1 | 33.33% |
| Timur Tabi | 11 | 25.00% | 1 | 33.33% |
| Rob Herring | 10 | 22.73% | 1 | 33.33% |
| Total | 44 | 100.00% | 3 | 100.00% |
device_initcall(hvc_dcc_init);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Daniel Walker | 197 | 66.11% | 1 | 20.00% |
| Rob Herring | 71 | 23.83% | 1 | 20.00% |
| Timur Tabi | 24 | 8.05% | 1 | 20.00% |
| Stephen Boyd | 4 | 1.34% | 1 | 20.00% |
| Christopher Covington | 2 | 0.67% | 1 | 20.00% |
| Total | 298 | 100.00% | 5 | 100.00% |
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