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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=kLk06+greqV0MrWizgfV lU/n7X6aL6nrTao414/zYCA=; b=gKmBk/U57dc0fCIusykJmOIYai1ewqSjQDcD rc63IyeLPS54O38U5DH94/KeYlzu8Ed4w90HhO5NJzRYr7kdjC7AnRe/DNLaNhxK MXeDuuBt/6LHLyxzZ9bYO2e3z4YSAIhuqAxIZ76w/a8u5L1fqjlc7hmBSVY1+uI5 WIl4ASd0IgMGozNOWDD1f+ePw21PtH1ytdv0gv0DQqYADMVJlsndMlRDfYXmxx1T Bo4BV4bGbkAhfHTRJ0QVC6p7QgwoEvGl5Wfrqtv0/P8Iz7CRmMxzYcWhg7PxbzAV wboHiIlezBXccUFy8mPPU6ei5fLGpob3ATaZG5YoaEannANirtNb9M4A0PNPdkOg SUqZ+r+Nao0i2y2bhBwFAT8AGzpiKuPUsLYFEn9E4ls32O0uoghqB+i2Aj8+aPt8 LiSqQeqVS32aExZwwWQUK54XI6MNg1TTVhJTKVmMUPQMmNxZ/whzseE01Nxy/Ijr hRDyAbJe/4yiGgM+cKShaqgv77FMbpa0BInZkZvMe19xcTmIZqxoHaQKcd4YWm9y eosZyzGW2XY3KffoDUDMy8qExO64DR6bVzAd3swqXuufUzvOdA0401nzIIklRXRs MscZs78hp0dp4DiivqfBndV846TvMWujVDxqYcTybFmqrXORg/tO2j56VWtujOtt v1Y7Jxw= From: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= To: , , CC: =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= , "Kamel Bouhara" , William Breathitt Gray Subject: [PATCH v8 1/2] counter: microchip-tcb-capture: Add IRQ handling Date: Thu, 6 Mar 2025 14:44:36 +0100 Message-ID: <20250306134441.582819-2-csokas.bence@prolan.hu> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250306134441.582819-1-csokas.bence@prolan.hu> References: <20250306134441.582819-1-csokas.bence@prolan.hu> MIME-Version: 1.0 X-ESET-AS: R=OK;S=0;OP=CALC;TIME=1741268684;VERSION=7985;MC=3654015039;ID=1566296;TRN=0;CRV=0;IPC=;SP=0;SIPS=0;PI=3;F=0 X-ESET-Antispam: OK X-EsetResult: clean, is OK X-EsetId: 37303A2980D94852637C6A X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250306_054456_655697_F71DD3DF X-CRM114-Status: GOOD ( 23.69 ) 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 Changes in v8: * Remove `priv->irq` and replace with function arg MAINTAINERS | 1 + drivers/counter/microchip-tcb-capture.c | 74 +++++++++++++++++++ .../linux/counter/microchip-tcb-capture.h | 34 +++++++++ 3 files changed, 109 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..16707099bd69 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) @@ -294,6 +300,65 @@ 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, int irq) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + int ret = devm_request_irq(counter->parent, 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 +443,15 @@ static int mchp_tc_probe(struct platform_device *pdev) counter->num_signals = ARRAY_SIZE(mchp_tc_count_signals); counter->signals = mchp_tc_count_signals; + i = of_irq_get(np->parent, 0); + if (i == -EPROBE_DEFER) + return -EPROBE_DEFER; + if (i > 0) { + ret = mchp_tc_irq_enable(counter, i); + 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_ */