Commit f4d1749e authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Paul Mackerras
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[PATCH] powerpc: add hvc backend for rtas 



Current Cell hardware is using the console through a set
of rtas calls. This driver is needed to get console
output on those boards.

Signed-off-by: default avatarArnd Bergmann <abergman@de.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 45d607ed

drivers/char/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -579,6 +579,13 @@ config HVC_CONSOLE 
	  console. This driver allows each pSeries partition to have a console

	  which is accessed via the HMC.



config HVC_RTAS

	bool "IBM RTAS Console support"

	depends on PPC_RTAS

	select HVC_DRIVER

	help

	  IBM Console device driver which makes use of RTAS



config HVCS

	tristate "IBM Hypervisor Virtual Console Server support"

	depends on PPC_PSERIES

drivers/char/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ obj-$(CONFIG_SX) += sx.o generic_serial.o 
obj-$(CONFIG_RIO)		+= rio/ generic_serial.o

obj-$(CONFIG_HVC_DRIVER)	+= hvc_console.o

obj-$(CONFIG_HVC_CONSOLE)	+= hvc_vio.o hvsi.o

obj-$(CONFIG_HVC_RTAS)		+= hvc_rtas.o

obj-$(CONFIG_RAW_DRIVER)	+= raw.o

obj-$(CONFIG_SGI_SNSC)		+= snsc.o snsc_event.o

obj-$(CONFIG_MMTIMER)		+= mmtimer.o

drivers/char/hvc_rtas.c

0 → 100644
+138 −0
Original line number Diff line number Diff line 
/*

 * IBM RTAS driver interface to hvc_console.c

 *

 * (C) Copyright IBM Corporation 2001-2005

 * (C) Copyright Red Hat, Inc. 2005

 *

 * Author(s): Maximino Augilar <IBM STI Design Center>

 *	    : Ryan S. Arnold <rsa@us.ibm.com>

 *	    : Utz Bacher <utz.bacher@de.ibm.com>

 *	    : David Woodhouse <dwmw2@infradead.org>

 *

 *    inspired by drivers/char/hvc_console.c

 *    written by Anton Blanchard and Paul Mackerras

 *

 * 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 <asm/irq.h>

#include <asm/rtas.h>

#include "hvc_console.h"



#define hvc_rtas_cookie 0x67781e15

struct hvc_struct *hvc_rtas_dev;



#define RTASCONS_PUT_ATTEMPTS  16



static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE;

static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE;

static int rtascons_put_delay = 100;

module_param_named(put_delay, rtascons_put_delay, int, 0644);



static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf, int count)

{

	int done;



	/* if there is more than one character to be displayed, wait a bit */

	for (done = 0; done < count; done++) {

		int result;

		result = rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[done]);

		if (result)

			break;

	}

	/* the calling routine expects to receive the number of bytes sent */

	return done;

}



static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count)

{

	int i;



	for (i = 0; i < count; i++) {

		int c, err;



		err = rtas_call(rtascons_get_char_token, 0, 2, &c);

		if (err)

			break;



		buf[i] = c;

	}



	return i;

}



static struct hv_ops hvc_rtas_get_put_ops = {

	.get_chars = hvc_rtas_read_console,

	.put_chars = hvc_rtas_write_console,

};



static int hvc_rtas_init(void)

{

	struct hvc_struct *hp;



	if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)

		rtascons_put_char_token = rtas_token("put-term-char");

	if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)

		return -EIO;



	if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)

		rtascons_get_char_token = rtas_token("get-term-char");

	if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)

		return -EIO;



	BUG_ON(hvc_rtas_dev);



	/* Allocate an hvc_struct for the console device we instantiated

	 * earlier.  Save off hp so that we can return it on exit */

	hp = hvc_alloc(hvc_rtas_cookie, NO_IRQ, &hvc_rtas_get_put_ops);

	if (IS_ERR(hp))

		return PTR_ERR(hp);

	hvc_rtas_dev = hp;

	return 0;

}

module_init(hvc_rtas_init);



/* This will tear down the tty portion of the driver */

static void __exit hvc_rtas_exit(void)

{

	/* Really the fun isn't over until the worker thread breaks down and the

	 * tty cleans up */

	if (hvc_rtas_dev)

		hvc_remove(hvc_rtas_dev);

}

module_exit(hvc_rtas_exit);



/* This will happen prior to module init.  There is no tty at this time? */

static int hvc_rtas_console_init(void)

{

	rtascons_put_char_token = rtas_token("put-term-char");

	if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)

		return -EIO;

	rtascons_get_char_token = rtas_token("get-term-char");

	if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)

		return -EIO;



	hvc_instantiate(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops );

	add_preferred_console("hvc", 0, NULL);

	return 0;

}

console_initcall(hvc_rtas_console_init);