Commit 7224adbb authored by Neelesh Gupta's avatar Neelesh Gupta Committed by Benjamin Herrenschmidt
Browse files

powerpc/powernv: Enable fetching of platform sensor data 



This patch enables fetching of various platform sensor data through
OPAL and expects a sensor handle from the driver to pass to OPAL.

Signed-off-by: default avatarNeelesh Gupta <neelegup@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 4029cd66

arch/powerpc/include/asm/opal.h

+4 −0
Original line number Diff line number Diff line
@@ -168,6 +168,7 @@ extern int opal_enter_rtas(struct rtas_args *args, 
#define OPAL_GET_MSG				85

#define OPAL_CHECK_ASYNC_COMPLETION		86

#define OPAL_SYNC_HOST_REBOOT			87

#define OPAL_SENSOR_READ			88

#define OPAL_GET_PARAM				89

#define OPAL_SET_PARAM				90

#define OPAL_DUMP_RESEND			91
@@ -872,6 +873,8 @@ int64_t opal_get_param(uint64_t token, uint32_t param_id, uint64_t buffer, 
		size_t length);

int64_t opal_set_param(uint64_t token, uint32_t param_id, uint64_t buffer,

		size_t length);

int64_t opal_sensor_read(uint32_t sensor_hndl, int token,

		uint32_t *sensor_data);



/* Internal functions */

extern int early_init_dt_scan_opal(unsigned long node, const char *uname, int depth, void *data);
@@ -902,6 +905,7 @@ extern int opal_async_get_token_interruptible(void); 
extern int __opal_async_release_token(int token);

extern int opal_async_release_token(int token);

extern int opal_async_wait_response(uint64_t token, struct opal_msg *msg);

extern int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data);



extern void hvc_opal_init_early(void);

arch/powerpc/platforms/powernv/Makefile

+1 −1
Original line number Diff line number Diff line 
obj-y			+= setup.o opal-takeover.o opal-wrappers.o opal.o opal-async.o

obj-y			+= opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o

obj-y			+= rng.o opal-elog.o opal-dump.o opal-sysparam.o

obj-y			+= rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o



obj-$(CONFIG_SMP)	+= smp.o

obj-$(CONFIG_PCI)	+= pci.o pci-p5ioc2.o pci-ioda.o

arch/powerpc/platforms/powernv/opal-sensor.c

0 → 100644
+64 −0
Original line number Diff line number Diff line 
/*

 * PowerNV sensor code

 *

 * Copyright (C) 2013 IBM

 *

 * 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/delay.h>

#include <linux/mutex.h>

#include <asm/opal.h>



static DEFINE_MUTEX(opal_sensor_mutex);



/*

 * This will return sensor information to driver based on the requested sensor

 * handle. A handle is an opaque id for the powernv, read by the driver from the

 * device tree..

 */

int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)

{

	int ret, token;

	struct opal_msg msg;



	token = opal_async_get_token_interruptible();

	if (token < 0) {

		pr_err("%s: Couldn't get the token, returning\n", __func__);

		ret = token;

		goto out;

	}



	mutex_lock(&opal_sensor_mutex);

	ret = opal_sensor_read(sensor_hndl, token, sensor_data);

	if (ret != OPAL_ASYNC_COMPLETION)

		goto out_token;



	ret = opal_async_wait_response(token, &msg);

	if (ret) {

		pr_err("%s: Failed to wait for the async response, %d\n",

				__func__, ret);

		goto out_token;

	}



	ret = msg.params[1];



out_token:

	mutex_unlock(&opal_sensor_mutex);

	opal_async_release_token(token);

out:

	return ret;

}

EXPORT_SYMBOL_GPL(opal_get_sensor_data);

arch/powerpc/platforms/powernv/opal-wrappers.S

+1 −0
Original line number Diff line number Diff line
@@ -140,5 +140,6 @@ OPAL_CALL(opal_get_msg, OPAL_GET_MSG); 
OPAL_CALL(opal_check_completion,		OPAL_CHECK_ASYNC_COMPLETION);

OPAL_CALL(opal_dump_resend_notification,	OPAL_DUMP_RESEND);

OPAL_CALL(opal_sync_host_reboot,		OPAL_SYNC_HOST_REBOOT);

OPAL_CALL(opal_sensor_read,			OPAL_SENSOR_READ);

OPAL_CALL(opal_get_param,			OPAL_GET_PARAM);

OPAL_CALL(opal_set_param,			OPAL_SET_PARAM);