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: Neelesh Gupta <neelegup@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -168,6 +168,7 @@ extern int opal_enter_rtas(struct rtas_args *args,
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#define OPAL_GET_MSG 85
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#define OPAL_CHECK_ASYNC_COMPLETION 86
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#define OPAL_SYNC_HOST_REBOOT 87
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#define OPAL_SENSOR_READ 88
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#define OPAL_GET_PARAM 89
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#define OPAL_SET_PARAM 90
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#define OPAL_DUMP_RESEND 91
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@ -872,6 +873,8 @@ int64_t opal_get_param(uint64_t token, uint32_t param_id, uint64_t buffer,
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size_t length);
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int64_t opal_set_param(uint64_t token, uint32_t param_id, uint64_t buffer,
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size_t length);
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int64_t opal_sensor_read(uint32_t sensor_hndl, int token,
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uint32_t *sensor_data);
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/* Internal functions */
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extern int early_init_dt_scan_opal(unsigned long node, const char *uname, int depth, void *data);
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@ -902,6 +905,7 @@ extern int opal_async_get_token_interruptible(void);
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extern int __opal_async_release_token(int token);
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extern int opal_async_release_token(int token);
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extern int opal_async_wait_response(uint64_t token, struct opal_msg *msg);
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extern int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data);
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extern void hvc_opal_init_early(void);
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@ -1,6 +1,6 @@
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obj-y += setup.o opal-takeover.o opal-wrappers.o opal.o opal-async.o
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obj-y += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
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obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o
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obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_PCI) += pci.o pci-p5ioc2.o pci-ioda.o
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64
arch/powerpc/platforms/powernv/opal-sensor.c
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64
arch/powerpc/platforms/powernv/opal-sensor.c
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@ -0,0 +1,64 @@
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/*
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* PowerNV sensor code
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*
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* Copyright (C) 2013 IBM
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <asm/opal.h>
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static DEFINE_MUTEX(opal_sensor_mutex);
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/*
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* This will return sensor information to driver based on the requested sensor
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* handle. A handle is an opaque id for the powernv, read by the driver from the
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* device tree..
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*/
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int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
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{
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int ret, token;
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struct opal_msg msg;
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token = opal_async_get_token_interruptible();
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if (token < 0) {
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pr_err("%s: Couldn't get the token, returning\n", __func__);
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ret = token;
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goto out;
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}
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mutex_lock(&opal_sensor_mutex);
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ret = opal_sensor_read(sensor_hndl, token, sensor_data);
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if (ret != OPAL_ASYNC_COMPLETION)
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goto out_token;
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ret = opal_async_wait_response(token, &msg);
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if (ret) {
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pr_err("%s: Failed to wait for the async response, %d\n",
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__func__, ret);
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goto out_token;
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}
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ret = msg.params[1];
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out_token:
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mutex_unlock(&opal_sensor_mutex);
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opal_async_release_token(token);
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out:
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return ret;
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}
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EXPORT_SYMBOL_GPL(opal_get_sensor_data);
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@ -140,5 +140,6 @@ OPAL_CALL(opal_get_msg, OPAL_GET_MSG);
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OPAL_CALL(opal_check_completion, OPAL_CHECK_ASYNC_COMPLETION);
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OPAL_CALL(opal_dump_resend_notification, OPAL_DUMP_RESEND);
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OPAL_CALL(opal_sync_host_reboot, OPAL_SYNC_HOST_REBOOT);
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OPAL_CALL(opal_sensor_read, OPAL_SENSOR_READ);
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OPAL_CALL(opal_get_param, OPAL_GET_PARAM);
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OPAL_CALL(opal_set_param, OPAL_SET_PARAM);
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