212bebb409
As a part of pseries_idle backend driver cleanup to make the code common to both pseries and powernv platforms, it is necessary to move the backend-driver code to drivers/cpuidle. As a pre-requisite for that, it is essential to move plpar_wrapper.h to include/asm. Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/*
|
|
* hvconsole.c
|
|
* Copyright (C) 2004 Hollis Blanchard, IBM Corporation
|
|
* Copyright (C) 2004 IBM Corporation
|
|
*
|
|
* Additional Author(s):
|
|
* Ryan S. Arnold <rsa@us.ibm.com>
|
|
*
|
|
* LPAR console support.
|
|
*
|
|
* 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/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/errno.h>
|
|
#include <asm/hvcall.h>
|
|
#include <asm/hvconsole.h>
|
|
#include <asm/plpar_wrappers.h>
|
|
|
|
/**
|
|
* hvc_get_chars - retrieve characters from firmware for denoted vterm adatper
|
|
* @vtermno: The vtermno or unit_address of the adapter from which to fetch the
|
|
* data.
|
|
* @buf: The character buffer into which to put the character data fetched from
|
|
* firmware.
|
|
* @count: not used?
|
|
*/
|
|
int hvc_get_chars(uint32_t vtermno, char *buf, int count)
|
|
{
|
|
long ret;
|
|
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
|
|
unsigned long *lbuf = (unsigned long *)buf;
|
|
|
|
ret = plpar_hcall(H_GET_TERM_CHAR, retbuf, vtermno);
|
|
lbuf[0] = be64_to_cpu(retbuf[1]);
|
|
lbuf[1] = be64_to_cpu(retbuf[2]);
|
|
|
|
if (ret == H_SUCCESS)
|
|
return retbuf[0];
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(hvc_get_chars);
|
|
|
|
|
|
/**
|
|
* hvc_put_chars: send characters to firmware for denoted vterm adapter
|
|
* @vtermno: The vtermno or unit_address of the adapter from which the data
|
|
* originated.
|
|
* @buf: The character buffer that contains the character data to send to
|
|
* firmware.
|
|
* @count: Send this number of characters.
|
|
*/
|
|
int hvc_put_chars(uint32_t vtermno, const char *buf, int count)
|
|
{
|
|
unsigned long *lbuf = (unsigned long *) buf;
|
|
long ret;
|
|
|
|
|
|
/* hcall will ret H_PARAMETER if 'count' exceeds firmware max.*/
|
|
if (count > MAX_VIO_PUT_CHARS)
|
|
count = MAX_VIO_PUT_CHARS;
|
|
|
|
ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count,
|
|
cpu_to_be64(lbuf[0]),
|
|
cpu_to_be64(lbuf[1]));
|
|
if (ret == H_SUCCESS)
|
|
return count;
|
|
if (ret == H_BUSY)
|
|
return -EAGAIN;
|
|
return -EIO;
|
|
}
|
|
|
|
EXPORT_SYMBOL(hvc_put_chars);
|