From patchwork Tue Mar 4 15:51:51 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= X-Patchwork-Id: 14001182 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B971FC021B8 for ; Tue, 4 Mar 2025 17:19:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; 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a=rsa-sha256; c=relaxed/relaxed; d=prolan.hu; h=cc :cc:content-transfer-encoding:content-type:content-type:date :from:from:in-reply-to:message-id:mime-version:references :reply-to:subject:subject:to:to; s=mail; bh=5dTjSfqKK0R8bH627adq ctcxC4syGnvamM8bnp4FMho=; b=muU3Xo/Fvxv2UOYdmwROavNw0Ju2gIH4N5Os cTU1R4sOTSvjobUkpWS72EKr5RD9R2gINJ/V7mx9D9LykHSQRbDglEHFKuFLYNEa 8JQ1x82/28EDXk95hcjYgV6ScFB658NKtsoaAoqXYdsLaGLg249YEZHJW7TFD1QC H6v04PylOGdDzS2oNx0Nj+jePNWpmMynoFnWqkThmO/28Amw3LQoCIB9D37+F9Jo CLxFSPkCc5M7YUDlQHXwqCK+NlE0ysPqoOtied+IIp07+dI272IH3FIPNINvjjoH LdxMEC+kJGDpvffme306vudIW5ZkaKL6OQdbEevq6mZeae7Ozoa4oyHXw7lcfMFt /bLTR66EMZfADnuqyTFHZY02z6M8gR9pT8MkrQ96GKL6rp/QuzyQv38OP4WanmU6 CNv0HMLabmaEJ8DG4VmWiiGzQOaf/heVpGJ4WBvHnUj00WzORR8FYGSzwXfhq9xA XsnkL9SpOF4JuXMhcwR4Yhtz6Vd0xrWgcNSLybw7agX4R69yVyBk429Q4AIu55ct IrZZjITWgwGFLyDoaKg5PPMQ7takZ7K2teKznqhhYEf5CSgtjWp1nMX5IWq9RuZ7 54JFwuLL0pwtzrMv4PtIJizDv+wklKcd58C65Fz0L4tXSjy/JNmKjrXyryDTRiMP SehyA8k= From: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= To: , , CC: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= , "Kamel Bouhara" , William Breathitt Gray Subject: [PATCH v7 1/2] counter: microchip-tcb-capture: Add IRQ handling Date: Tue, 4 Mar 2025 16:51:51 +0100 Message-ID: <20250304155156.374150-2-csokas.bence@prolan.hu> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250304155156.374150-1-csokas.bence@prolan.hu> References: <20250304155156.374150-1-csokas.bence@prolan.hu> MIME-Version: 1.0 X-ESET-AS: R=OK;S=0;OP=CALC;TIME=1741103543;VERSION=7985;MC=1607386707;ID=1544447;TRN=0;CRV=0;IPC=;SP=0;SIPS=0;PI=3;F=0 X-ESET-Antispam: OK X-EsetResult: clean, is OK X-EsetId: 37303A2980D94852637264 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250304_075226_602119_F7807831 X-CRM114-Status: GOOD ( 24.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add interrupt servicing to allow userspace to wait for the following: * Change-of-state caused by external trigger * Capture of timer value into RA/RB * Compare to RC register * Overflow Signed-off-by: Bence Csókás --- Notes: New in v2 Changes in v3: * Add IRQs for Capture events (from next patch) * Add IRQ for RC Compare * Add events as bullet points to commit msg Changes in v4: * Add uapi header, names for the event channels * Add check for -EPROBE_DEFER from `of_irq_get()` Changes in v5: * Split out UAPI header introduction Changes in v7: * Revert split-out * Drop `enum counter_mchp_signals` from UAPI * Change enums to #define's in UAPI header MAINTAINERS | 1 + drivers/counter/microchip-tcb-capture.c | 75 +++++++++++++++++++ .../linux/counter/microchip-tcb-capture.h | 34 +++++++++ 3 files changed, 110 insertions(+) create mode 100644 include/uapi/linux/counter/microchip-tcb-capture.h diff --git a/MAINTAINERS b/MAINTAINERS index 8e047e20fbd8..d1d264210690 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -15579,6 +15579,7 @@ L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers) L: linux-iio@vger.kernel.org S: Maintained F: drivers/counter/microchip-tcb-capture.c +F: include/uapi/linux/counter/microchip-tcb-capture.h MICROCHIP USB251XB DRIVER M: Richard Leitner diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c index 2f096a5b973d..cc12c2e2113a 100644 --- a/drivers/counter/microchip-tcb-capture.c +++ b/drivers/counter/microchip-tcb-capture.c @@ -6,18 +6,24 @@ */ #include #include +#include #include #include #include #include +#include #include #include +#include #include #define ATMEL_TC_CMR_MASK (ATMEL_TC_LDRA_RISING | ATMEL_TC_LDRB_FALLING | \ ATMEL_TC_ETRGEDG_RISING | ATMEL_TC_LDBDIS | \ ATMEL_TC_LDBSTOP) +#define ATMEL_TC_DEF_IRQS (ATMEL_TC_ETRGS | ATMEL_TC_COVFS | \ + ATMEL_TC_LDRAS | ATMEL_TC_LDRBS | ATMEL_TC_CPCS) + #define ATMEL_TC_QDEN BIT(8) #define ATMEL_TC_POSEN BIT(9) @@ -27,6 +33,7 @@ struct mchp_tc_data { int qdec_mode; int num_channels; int channel[2]; + int irq; }; static const enum counter_function mchp_tc_count_functions[] = { @@ -294,6 +301,65 @@ static const struct of_device_id atmel_tc_of_match[] = { { /* sentinel */ } }; +static irqreturn_t mchp_tc_isr(int irq, void *dev_id) +{ + struct counter_device *const counter = dev_id; + struct mchp_tc_data *const priv = counter_priv(counter); + u32 sr, mask; + + regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], SR), &sr); + regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], IMR), &mask); + + sr &= mask; + if (!(sr & ATMEL_TC_ALL_IRQ)) + return IRQ_NONE; + + if (sr & ATMEL_TC_ETRGS) + counter_push_event(counter, COUNTER_EVENT_CHANGE_OF_STATE, + COUNTER_MCHP_EVCHN_CV); + if (sr & ATMEL_TC_LDRAS) + counter_push_event(counter, COUNTER_EVENT_CAPTURE, + COUNTER_MCHP_EVCHN_RA); + if (sr & ATMEL_TC_LDRBS) + counter_push_event(counter, COUNTER_EVENT_CAPTURE, + COUNTER_MCHP_EVCHN_RB); + if (sr & ATMEL_TC_CPCS) + counter_push_event(counter, COUNTER_EVENT_THRESHOLD, + COUNTER_MCHP_EVCHN_RC); + if (sr & ATMEL_TC_COVFS) + counter_push_event(counter, COUNTER_EVENT_OVERFLOW, + COUNTER_MCHP_EVCHN_CV); + + return IRQ_HANDLED; +} + +static void mchp_tc_irq_remove(void *ptr) +{ + struct mchp_tc_data *priv = ptr; + + regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], IDR), ATMEL_TC_DEF_IRQS); +} + +static int mchp_tc_irq_enable(struct counter_device *const counter) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + int ret = devm_request_irq(counter->parent, priv->irq, mchp_tc_isr, 0, + dev_name(counter->parent), counter); + + if (ret < 0) + return ret; + + ret = regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], IER), ATMEL_TC_DEF_IRQS); + if (ret < 0) + return ret; + + ret = devm_add_action_or_reset(counter->parent, mchp_tc_irq_remove, priv); + if (ret < 0) + return ret; + + return 0; +} + static void mchp_tc_clk_remove(void *ptr) { clk_disable_unprepare((struct clk *)ptr); @@ -378,6 +444,15 @@ static int mchp_tc_probe(struct platform_device *pdev) counter->num_signals = ARRAY_SIZE(mchp_tc_count_signals); counter->signals = mchp_tc_count_signals; + priv->irq = of_irq_get(np->parent, 0); + if (priv->irq == -EPROBE_DEFER) + return -EPROBE_DEFER; + if (priv->irq > 0) { + ret = mchp_tc_irq_enable(counter); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, "Failed to set up IRQ"); + } + ret = devm_counter_add(&pdev->dev, counter); if (ret < 0) return dev_err_probe(&pdev->dev, ret, "Failed to add counter\n"); diff --git a/include/uapi/linux/counter/microchip-tcb-capture.h b/include/uapi/linux/counter/microchip-tcb-capture.h new file mode 100644 index 000000000000..f3ef315fe9f6 --- /dev/null +++ b/include/uapi/linux/counter/microchip-tcb-capture.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * Channel numbers used by the microchip-tcb-capture driver + * Copyright (C) 2025 Bence Csókás + */ +#ifndef _UAPI_COUNTER_MCHP_TCB_H_ +#define _UAPI_COUNTER_MCHP_TCB_H_ + +/* + * The driver defines the following components: + * + * Count 0 + * \__ Synapse 0 -- Signal 0 (Channel A, i.e. TIOA) + * \__ Synapse 1 -- Signal 1 (Channel B, i.e. TIOB) + * + * It also supports the following events: + * + * Channel 0: + * - CV register changed + * - CV overflowed + * - RA captured + * Channel 1: + * - RB captured + * Channel 2: + * - RC compare triggered + */ + +/* Event channels */ +#define COUNTER_MCHP_EVCHN_CV 0 +#define COUNTER_MCHP_EVCHN_RA 0 +#define COUNTER_MCHP_EVCHN_RB 1 +#define COUNTER_MCHP_EVCHN_RC 2 + +#endif /* _UAPI_COUNTER_MCHP_TCB_H_ */ From patchwork Tue Mar 4 15:51:52 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= X-Patchwork-Id: 14001183 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 313C1C021B8 for ; Tue, 4 Mar 2025 17:21:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=WmIWZfNW61AlqLDV5lti3V+Y+HfZggvgwmSk+uB30ww=; 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d=prolan.hu; h=cc :cc:content-transfer-encoding:content-type:content-type:date :from:from:in-reply-to:message-id:mime-version:references :reply-to:subject:subject:to:to; s=mail; bh=WmIWZfNW61AlqLDV5lti 3V+Y+HfZggvgwmSk+uB30ww=; b=TfQlwImWIiuaBo5goUiawgvODWdiEZys0s/J UP7u+kDMExYT1dg29p5kwD9L7QYXSI/DYZnoUTj9zwDgQpvX9DQnowO2poArfGWn YG+ivLwHug0ceL13BWlOT58HgxueSstrCd7/qcup8ibCsi2jDh43EY83udMSOhA0 lXffaBb4OGxFFxiKgdL3r1t/NNPjAYP8SVU43B6sO1inVHbqM2FyBXu1gURb2Xql ZzbZrLWwlT5MzRTTvP53EsEiOvtXGhhFaFDX1IE/Hpx48yeVUkQp9XAR1dAxx//X DZ+n0G4Y8+vobgyjhdkaBtT5B9DcSUn2HprQ0oGhJooCqnXLyh7gr50jr344Ww2P 9DnMaydN6w5ajIVeRHzjkBrzP925/mL9wV7UyKjtnoiDOcqYEYBV11WUHPwFo+A8 oYHCUSa+24U6qat3eWF4mSy6I5c5SMPdX8sGSHmGnsxoemv6zajz0fjJRPIvADNT tJ3/DV15ufes0h63eh23rirBMy2rNtUkyMY8ULX8wlden+COSXzdWsSmIO/zrssU nu6Sts9MhWS4SzxOUupp6grwrgE5QLl9lqAMxN1iGNj47bZIl/1YAWB8o3AsdnR0 h6ztpfXpn7ospQR0DBcGhqjBftji8dRV/orAEJ/4Z7s0YBWKnqwamuEzBb9aX4q6 T0bPt6s= From: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= To: , , CC: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= , "Kamel Bouhara" , William Breathitt Gray Subject: [PATCH v7 2/2] counter: microchip-tcb-capture: Add capture extensions for registers RA/RB Date: Tue, 4 Mar 2025 16:51:52 +0100 Message-ID: <20250304155156.374150-3-csokas.bence@prolan.hu> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250304155156.374150-1-csokas.bence@prolan.hu> References: <20250304155156.374150-1-csokas.bence@prolan.hu> MIME-Version: 1.0 X-ESET-AS: R=OK;S=0;OP=CALC;TIME=1741103546;VERSION=7985;MC=2493638075;ID=1544448;TRN=0;CRV=0;IPC=;SP=0;SIPS=0;PI=3;F=0 X-ESET-Antispam: OK X-EsetResult: clean, is OK X-EsetId: 37303A2980D94852637264 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250304_075228_546884_51594321 X-CRM114-Status: GOOD ( 13.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org TCB hardware is capable of capturing the timer value to registers RA and RB. Add these registers as capture extensions. Signed-off-by: Bence Csókás --- Notes: Changes in v2: * Add IRQs Changes in v3: * Move IRQs to previous patch Changes in v4: * Return the status of the regmap_*() operations * Add names for the extension numbers Changes in v6: * Remove RC, as it is not a capture register Changes in v7: * Change enums to #define's in UAPI header * Return early on error in `mchp_tc_count_cap_read()` drivers/counter/microchip-tcb-capture.c | 58 +++++++++++++++++++ .../linux/counter/microchip-tcb-capture.h | 6 ++ 2 files changed, 64 insertions(+) diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c index cc12c2e2113a..52493f7e8b57 100644 --- a/drivers/counter/microchip-tcb-capture.c +++ b/drivers/counter/microchip-tcb-capture.c @@ -254,6 +254,62 @@ static int mchp_tc_count_read(struct counter_device *counter, return 0; } +static int mchp_tc_count_cap_read(struct counter_device *counter, + struct counter_count *count, size_t idx, u64 *val) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + u32 cnt; + int ret; + + switch (idx) { + case COUNTER_MCHP_EXCAP_RA: + ret = regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], RA), &cnt); + break; + case COUNTER_MCHP_EXCAP_RB: + ret = regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], RB), &cnt); + break; + default: + return -EINVAL; + } + + if (ret < 0) + return ret; + + *val = cnt; + + return 0; +} + +static int mchp_tc_count_cap_write(struct counter_device *counter, + struct counter_count *count, size_t idx, u64 val) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + int ret; + + if (val > U32_MAX) + return -ERANGE; + + switch (idx) { + case COUNTER_MCHP_EXCAP_RA: + ret = regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], RA), val); + break; + case COUNTER_MCHP_EXCAP_RB: + ret = regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], RB), val); + break; + default: + return -EINVAL; + } + + return ret; +} + +static DEFINE_COUNTER_ARRAY_CAPTURE(mchp_tc_cnt_cap_array, 2); + +static struct counter_comp mchp_tc_count_ext[] = { + COUNTER_COMP_ARRAY_CAPTURE(mchp_tc_count_cap_read, mchp_tc_count_cap_write, + mchp_tc_cnt_cap_array), +}; + static struct counter_count mchp_tc_counts[] = { { .id = 0, @@ -262,6 +318,8 @@ static struct counter_count mchp_tc_counts[] = { .num_functions = ARRAY_SIZE(mchp_tc_count_functions), .synapses = mchp_tc_count_synapses, .num_synapses = ARRAY_SIZE(mchp_tc_count_synapses), + .ext = mchp_tc_count_ext, + .num_ext = ARRAY_SIZE(mchp_tc_count_ext), }, }; diff --git a/include/uapi/linux/counter/microchip-tcb-capture.h b/include/uapi/linux/counter/microchip-tcb-capture.h index f3ef315fe9f6..136e2faa7730 100644 --- a/include/uapi/linux/counter/microchip-tcb-capture.h +++ b/include/uapi/linux/counter/microchip-tcb-capture.h @@ -12,6 +12,8 @@ * Count 0 * \__ Synapse 0 -- Signal 0 (Channel A, i.e. TIOA) * \__ Synapse 1 -- Signal 1 (Channel B, i.e. TIOB) + * \__ Extension capture0 (RA register) + * \__ Extension capture1 (RB register) * * It also supports the following events: * @@ -25,6 +27,10 @@ * - RC compare triggered */ +/* Capture extensions */ +#define COUNTER_MCHP_EXCAP_RA 0 +#define COUNTER_MCHP_EXCAP_RB 1 + /* Event channels */ #define COUNTER_MCHP_EVCHN_CV 0 #define COUNTER_MCHP_EVCHN_RA 0