[mirror_ubuntu-bionic-kernel.git] / arch / powerpc / platforms / pseries / hvconsole.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 adapter
 * @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. Must be at least 16 bytes, even if count is less than 16.
 * @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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* hvconsole.c
	3	* Copyright (C) 2004 Hollis Blanchard, IBM Corporation
	4	* Copyright (C) 2004 IBM Corporation
	5	*
	6	* Additional Author(s):
	7	* Ryan S. Arnold <rsa@us.ibm.com>
	8	*
	9	* LPAR console support.
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	24	*/
	25
	26	#include <linux/kernel.h>
e9848d62 PG	27	#include <linux/export.h>
e9848d62 PG	28	#include <linux/errno.h>
1da177e4 LT	29	#include <asm/hvcall.h>
1da177e4 LT	30	#include <asm/hvconsole.h>
212bebb4	31	#include <asm/plpar_wrappers.h>
1da177e4 LT	32
1da177e4 LT	33	/**
446957ba	34	* hvc_get_chars - retrieve characters from firmware for denoted vterm adapter
1da177e4 LT	35	* @vtermno: The vtermno or unit_address of the adapter from which to fetch the
	36	* data.
	37	* @buf: The character buffer into which to put the character data fetched from
	38	* firmware.
	39	* @count: not used?
	40	*/
	41	int hvc_get_chars(uint32_t vtermno, char *buf, int count)
	42	{
a0a96ee9 AB	43	long ret;
	44	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
	45	unsigned long lbuf = (unsigned long )buf;
	46
	47	ret = plpar_hcall(H_GET_TERM_CHAR, retbuf, vtermno);
a02f6dfc AB	48	lbuf[0] = be64_to_cpu(retbuf[1]);
a02f6dfc AB	49	lbuf[1] = be64_to_cpu(retbuf[2]);
1da177e4	50
a0a96ee9 AB	51	if (ret == H_SUCCESS)
a0a96ee9 AB	52	return retbuf[0];
b9377ffc	53
1da177e4 LT	54	return 0;
	55	}
	56
	57	EXPORT_SYMBOL(hvc_get_chars);
	58
70b234a4	59
1da177e4 LT	60	/**
	61	* hvc_put_chars: send characters to firmware for denoted vterm adapter
	62	* @vtermno: The vtermno or unit_address of the adapter from which the data
	63	* originated.
	64	* @buf: The character buffer that contains the character data to send to
2717255f	65	* firmware. Must be at least 16 bytes, even if count is less than 16.
1da177e4 LT	66	* @count: Send this number of characters.
	67	*/
	68	int hvc_put_chars(uint32_t vtermno, const char *buf, int count)
	69	{
	70	unsigned long lbuf = (unsigned long ) buf;
	71	long ret;
	72
45d607ed RA	73
	74	/* hcall will ret H_PARAMETER if 'count' exceeds firmware max.*/
	75	if (count > MAX_VIO_PUT_CHARS)
	76	count = MAX_VIO_PUT_CHARS;
	77
a02f6dfc AB	78	ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count,
	79	cpu_to_be64(lbuf[0]),
	80	cpu_to_be64(lbuf[1]));
706c8c93	81	if (ret == H_SUCCESS)
1da177e4	82	return count;
706c8c93	83	if (ret == H_BUSY)
51d33021	84	return -EAGAIN;
1da177e4 LT	85	return -EIO;
	86	}
	87
	88	EXPORT_SYMBOL(hvc_put_chars);