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linux-next/drivers/tty/hvc/hvc_udbg.c
Paul Gortmaker 4fedd0bf47 drivers/tty/hvc: don't use module_init in non-modular hyp. console code
The HVC_OPAL/RTAS/UDBG/XEN options are all bool, and hence their support
is either present or absent.  It will never be modular, so using
module_init as an alias for __initcall is rather misleading.

Fix this up now, so that we can relocate module_init from
init.h into module.h in the future.  If we don't do this, we'd
have to add module.h to obviously non-modular code, and that
would be a worse thing.

Note that direct use of __initcall is discouraged, vs. one
of the priority categorized subgroups.  As __initcall gets
mapped onto device_initcall, our use of device_initcall
directly in this change means that the runtime impact is
zero -- it will remain at level 6 in initcall ordering.

Also the __exitcall functions have been outright deleted since
they are only ever of interest to UML, and UML will never be
using any of this code.

Cc: Richard Weinberger <richard@nod.at>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-07 08:40:54 -08:00

96 lines
2.0 KiB
C

/*
* udbg interface to hvc_console.c
*
* (C) Copyright David Gibson, IBM Corporation 2008.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 <linux/irq.h>
#include <asm/udbg.h>
#include "hvc_console.h"
struct hvc_struct *hvc_udbg_dev;
static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count)
{
int i;
for (i = 0; i < count && udbg_putc; i++)
udbg_putc(buf[i]);
return i;
}
static int hvc_udbg_get(uint32_t vtermno, char *buf, int count)
{
int i, c;
if (!udbg_getc_poll)
return 0;
for (i = 0; i < count; i++) {
if ((c = udbg_getc_poll()) == -1)
break;
buf[i] = c;
}
return i;
}
static const struct hv_ops hvc_udbg_ops = {
.get_chars = hvc_udbg_get,
.put_chars = hvc_udbg_put,
};
static int __init hvc_udbg_init(void)
{
struct hvc_struct *hp;
if (!udbg_putc)
return -ENODEV;
BUG_ON(hvc_udbg_dev);
hp = hvc_alloc(0, 0, &hvc_udbg_ops, 16);
if (IS_ERR(hp))
return PTR_ERR(hp);
hvc_udbg_dev = hp;
return 0;
}
device_initcall(hvc_udbg_init);
static int __init hvc_udbg_console_init(void)
{
if (!udbg_putc)
return -ENODEV;
hvc_instantiate(0, 0, &hvc_udbg_ops);
add_preferred_console("hvc", 0, NULL);
return 0;
}
console_initcall(hvc_udbg_console_init);