From patchwork Thu Apr 14 09:31:54 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rajendra Nayak X-Patchwork-Id: 8833131 X-Patchwork-Delegate: eduardo.valentin@ti.com Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B38C9C0554 for ; Thu, 14 Apr 2016 09:33:00 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 952392034A for ; Thu, 14 Apr 2016 09:32:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7DA48200E8 for ; Thu, 14 Apr 2016 09:32:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754241AbcDNJcq (ORCPT ); Thu, 14 Apr 2016 05:32:46 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:35268 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754238AbcDNJcn (ORCPT ); Thu, 14 Apr 2016 05:32:43 -0400 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 3DC51603B4; Thu, 14 Apr 2016 09:32:42 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 2BEC061640; Thu, 14 Apr 2016 09:32:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from blr-ubuntu-34.ap.qualcomm.com (unknown [202.46.23.61]) (using TLSv1.1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: rnayak@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 982746160C; Thu, 14 Apr 2016 09:32:36 +0000 (UTC) From: Rajendra Nayak To: edubezval@gmail.com Cc: andy.gross@linaro.org, linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, rui.zhang@intel.com, sboyd@codeaurora.org, nrajan@codeaurora.org, lina.iyer@linaro.org, punit.agrawal@arm.com, Rajendra Nayak Subject: [PATCH v5 06/11] thermal: qcom: tsens-8996: Add support for 8996 family of SoCs Date: Thu, 14 Apr 2016 15:01:54 +0530 Message-Id: <1460626319-14516-7-git-send-email-rnayak@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1460626319-14516-1-git-send-email-rnayak@codeaurora.org> References: <1460626319-14516-1-git-send-email-rnayak@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The TSENS controller in 8996 family of SoCs is capable of converting the ADC code outputs to real temperature values (in decidegree Celsius). It can also be programmed to provide raw ADC code, but the secure software on 8996 programs it to provide real temperatures and also does the needed calibrations. We check the valid bit to ensure valid data is read by the AHB master. And the spec recommends the below algorithm to read data 3 consecutive times, which takes care of the worst case delay taken to propogate the updated data to the register. Signed-off-by: Rajendra Nayak --- drivers/thermal/qcom/Makefile | 2 +- drivers/thermal/qcom/tsens-8996.c | 82 +++++++++++++++++++++++++++++++++++++++ drivers/thermal/qcom/tsens.c | 3 ++ drivers/thermal/qcom/tsens.h | 2 +- 4 files changed, 87 insertions(+), 2 deletions(-) create mode 100644 drivers/thermal/qcom/tsens-8996.c diff --git a/drivers/thermal/qcom/Makefile b/drivers/thermal/qcom/Makefile index f3cefd1..2cc2193 100644 --- a/drivers/thermal/qcom/Makefile +++ b/drivers/thermal/qcom/Makefile @@ -1,2 +1,2 @@ obj-$(CONFIG_QCOM_TSENS) += qcom_tsens.o -qcom_tsens-y += tsens.o tsens-common.o tsens-8916.o tsens-8974.o tsens-8960.o +qcom_tsens-y += tsens.o tsens-common.o tsens-8916.o tsens-8974.o tsens-8960.o tsens-8996.o diff --git a/drivers/thermal/qcom/tsens-8996.c b/drivers/thermal/qcom/tsens-8996.c new file mode 100644 index 0000000..3d70aa0 --- /dev/null +++ b/drivers/thermal/qcom/tsens-8996.c @@ -0,0 +1,82 @@ +/* + * Copyright (c) 2015, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * 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. + * + */ + +#include +#include +#include "tsens.h" + +#define STATUS_OFFSET 0x10a0 +#define LAST_TEMP_MASK 0xfff +#define STATUS_VALID_BIT BIT(21) +#define CODE_SIGN_BIT BIT(11) + +static int get_temp_8996(struct tsens_device *tmdev, int id, int *temp) +{ + struct tsens_sensor *s = &tmdev->sensor[id]; + u32 code; + unsigned int sensor_addr; + int last_temp = 0, last_temp2 = 0, last_temp3 = 0, ret; + + sensor_addr = STATUS_OFFSET + s->hw_id * 4; + ret = regmap_read(tmdev->map, sensor_addr, &code); + if (ret) + return ret; + last_temp = code & LAST_TEMP_MASK; + if (code & STATUS_VALID_BIT) + goto done; + + /* Try a second time */ + ret = regmap_read(tmdev->map, sensor_addr, &code); + if (ret) + return ret; + if (code & STATUS_VALID_BIT) { + last_temp = code & LAST_TEMP_MASK; + goto done; + } else + last_temp2 = code & LAST_TEMP_MASK; + + /* Try a third/last time */ + ret = regmap_read(tmdev->map, sensor_addr, &code); + if (ret) + return ret; + if (code & STATUS_VALID_BIT) { + last_temp = code & LAST_TEMP_MASK; + goto done; + } else + last_temp3 = code & LAST_TEMP_MASK; + + if (last_temp == last_temp2) + last_temp = last_temp2; + else if (last_temp2 == last_temp3) + last_temp = last_temp3; +done: + /* Code sign bit is the sign extension for a negative value */ + if (last_temp & CODE_SIGN_BIT) + last_temp |= ~CODE_SIGN_BIT; + + /* Temperatures are in deciCelicius */ + *temp = last_temp * 100; + + return 0; +} + +const struct tsens_ops ops_8996 = { + .init = init_common, + .get_temp = get_temp_8996, +}; + +const struct tsens_data data_8996 = { + .num_sensors = 13, + .ops = &ops_8996, +}; diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c index 096f64d..9ebe020 100644 --- a/drivers/thermal/qcom/tsens.c +++ b/drivers/thermal/qcom/tsens.c @@ -69,6 +69,9 @@ static const struct of_device_id tsens_table[] = { }, { .compatible = "qcom,msm8974-tsens", .data = &data_8974, + }, { + .compatible = "qcom,msm8996-tsens", + .data = &data_8996, }, {} }; diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h index 146d4f1..4a12df2 100644 --- a/drivers/thermal/qcom/tsens.h +++ b/drivers/thermal/qcom/tsens.h @@ -87,6 +87,6 @@ void compute_intercept_slope(struct tsens_device *, u32 *, u32 *, u32); int init_common(struct tsens_device *); int get_temp_common(struct tsens_device *, int, int *); -extern const struct tsens_data data_8916, data_8974, data_8960; +extern const struct tsens_data data_8916, data_8974, data_8960, data_8996; #endif /* __QCOM_TSENS_H__ */