From patchwork Thu May 5 08:51:44 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rajendra Nayak X-Patchwork-Id: 9022081 Return-Path: X-Original-To: patchwork-linux-arm@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 33AE9BF29F for ; Thu, 5 May 2016 08:55:55 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 33BD9203F3 for ; Thu, 5 May 2016 08:55:54 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 312F6203B0 for ; Thu, 5 May 2016 08:55:53 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ayF2W-0003IH-8Z; Thu, 05 May 2016 08:53:44 +0000 Received: from smtp.codeaurora.org ([198.145.29.96]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ayF1v-0002i4-Nv for linux-arm-kernel@lists.infradead.org; Thu, 05 May 2016 08:53:09 +0000 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 0E96961347; Thu, 5 May 2016 08:52:49 +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=-6.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, 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 2EB1F61347; Thu, 5 May 2016 08:52:42 +0000 (UTC) From: Rajendra Nayak To: edubezval@gmail.com, andy.gross@linaro.org Subject: [PATCH v6 06/11] thermal: qcom: tsens-8996: Add support for 8996 family of SoCs Date: Thu, 5 May 2016 14:21:44 +0530 Message-Id: <1462438309-11196-7-git-send-email-rnayak@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1462438309-11196-1-git-send-email-rnayak@codeaurora.org> References: <1462438309-11196-1-git-send-email-rnayak@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160505_015307_958977_FCF9EFCD X-CRM114-Status: GOOD ( 22.42 ) X-Spam-Score: -4.0 (----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rajendra Nayak , linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org, punit.agrawal@arm.com, sboyd@codeaurora.org, lina.iyer@linaro.org, nrajan@codeaurora.org, rui.zhang@intel.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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 propagate the updated data to the register. Signed-off-by: Rajendra Nayak --- drivers/thermal/qcom/Makefile | 2 +- drivers/thermal/qcom/tsens-8996.c | 84 +++++++++++++++++++++++++++++++++++++++ drivers/thermal/qcom/tsens.c | 3 ++ drivers/thermal/qcom/tsens.h | 2 +- 4 files changed, 89 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..e2e1274 --- /dev/null +++ b/drivers/thermal/qcom/tsens-8996.c @@ -0,0 +1,84 @@ +/* + * 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 cef86c3..b182272 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 42071a4..b0f8c47 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__ */