提交 16c63f8e 编写于 作者: D Daniel Walker 提交者: Greg Kroah-Hartman

drivers: char: hvc: add arm JTAG DCC console support

This driver adds a basic console that uses the arm JTAG
DCC to transfer data back and forth. It has support for
ARMv6 and ARMv7.

This console is created under the HVC driver, and should be named
/dev/hvcX (or /dev/hvc0 for example).

Cc: Tony Lindgren <tony@atomide.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NNicolas Pitre <nicolas.pitre@linaro.org>
Cc: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: NDaniel Walker <dwalker@codeaurora.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
上级 de6f86ce
...@@ -682,6 +682,15 @@ config HVC_UDBG ...@@ -682,6 +682,15 @@ config HVC_UDBG
select HVC_DRIVER select HVC_DRIVER
default n default n
config HVC_DCC
bool "ARM JTAG DCC console"
depends on ARM
select HVC_DRIVER
help
This console uses the JTAG DCC on ARM to create a console under the HVC
driver. This console is used through a JTAG only on ARM. If you don't have
a JTAG then you probably don't want this option.
config VIRTIO_CONSOLE config VIRTIO_CONSOLE
tristate "Virtio console" tristate "Virtio console"
depends on VIRTIO depends on VIRTIO
......
...@@ -34,6 +34,7 @@ obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o ...@@ -34,6 +34,7 @@ obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o
obj-$(CONFIG_HVC_ISERIES) += hvc_iseries.o obj-$(CONFIG_HVC_ISERIES) += hvc_iseries.o
obj-$(CONFIG_HVC_RTAS) += hvc_rtas.o obj-$(CONFIG_HVC_RTAS) += hvc_rtas.o
obj-$(CONFIG_HVC_TILE) += hvc_tile.o obj-$(CONFIG_HVC_TILE) += hvc_tile.o
obj-$(CONFIG_HVC_DCC) += hvc_dcc.o
obj-$(CONFIG_HVC_BEAT) += hvc_beat.o obj-$(CONFIG_HVC_BEAT) += hvc_beat.o
obj-$(CONFIG_HVC_DRIVER) += hvc_console.o obj-$(CONFIG_HVC_DRIVER) += hvc_console.o
obj-$(CONFIG_HVC_IRQ) += hvc_irq.o obj-$(CONFIG_HVC_IRQ) += hvc_irq.o
......
/* Copyright (c) 2010, Code Aurora Forum. 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#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 <asm/processor.h>
#include "hvc_console.h"
/* DCC Status Bits */
#define DCC_STATUS_RX (1 << 30)
#define DCC_STATUS_TX (1 << 29)
static inline u32 __dcc_getstatus(void)
{
u32 __ret;
asm("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg"
: "=r" (__ret) : : "cc");
return __ret;
}
#if defined(CONFIG_CPU_V7)
static inline char __dcc_getchar(void)
{
char __c;
asm("get_wait: mrc p14, 0, pc, c0, c1, 0 \n\
bne get_wait \n\
mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
: "=r" (__c) : : "cc");
return __c;
}
#else
static inline char __dcc_getchar(void)
{
char __c;
asm("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
: "=r" (__c));
return __c;
}
#endif
#if defined(CONFIG_CPU_V7)
static inline void __dcc_putchar(char c)
{
asm("put_wait: mrc p14, 0, pc, c0, c1, 0 \n\
bcs put_wait \n\
mcr p14, 0, %0, c0, c5, 0 "
: : "r" (c) : "cc");
}
#else
static inline void __dcc_putchar(char c)
{
asm("mcr p14, 0, %0, c0, c5, 0 @ write a char"
: /* no output register */
: "r" (c));
}
#endif
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((char)(buf[i] & 0xFF));
}
return count;
}
static int hvc_dcc_get_chars(uint32_t vt, char *buf, int count)
{
int i;
for (i = 0; i < count; ++i) {
int c = -1;
if (__dcc_getstatus() & DCC_STATUS_RX)
c = __dcc_getchar();
if (c < 0)
break;
buf[i] = c;
}
return i;
}
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)
{
hvc_instantiate(0, 0, &hvc_dcc_get_put_ops);
return 0;
}
console_initcall(hvc_dcc_console_init);
static int __init hvc_dcc_init(void)
{
hvc_alloc(0, 0, &hvc_dcc_get_put_ops, 128);
return 0;
}
device_initcall(hvc_dcc_init);
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