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b=oof6vXAG5k9mxF8yySy3LgsazAGSbGdVVleQ x4NRkSwWSK2SQXFmnN/ppH8gQiEZHLZqW39vTmJ6NXtdHLvNXhV7AGn6itj2BL9Y pGTWzjk8XiBZMdsvLJjIM6VWtOJmqQywkDcIPvGFDusP/ZNuUWnNOLX5E0ZToEsm 3vC2KVD94+PA1ItirPgBmjyakK1Y6LHxz33E0R6gyiTtXwofUdXgvfGy0fkJnVR2 1JMm0CnZlcg/m1n/8TeLjn8rHVjOy+JoBi6PtesiPEom83bS/bD/gJugOlvFkKyF zKPG4+O2pN+Jv6yWTkYafhcx384tyXv4CVDb5p9SUdv83eVatDFbJcC4vgFfwK0T MkJLwM8F4vdxWdCPRih5iAIpOpkw0J+hDeQtgGxei07xsTJlteurVW8/vS0vHy/7 637Fv9CVijWQfpl4IL/y6tu2cqsCaSWtpXrhl0lkece1aZcRwojcdW0Ft4XJsVIN sYOBNup/uydc25XBBzjm2zjueAULHuo71AgiJS4mG1SmICqk6mjfS9tdiRw4mQ5F f5QRWNZQFmepwgL6bfifdhAdXcRDRF9ElSILMGk/l3dLIQTav/3wTgG/IaC1cKiQ RtLL9LqEz2lSohSiy0jRa4dTpNhVebaf1TbnrSSsJ2BCeoAv5XZQKTqOk7K745bu z0BO5lE= From: =?UTF-8?q?Bence=20Cs=C3=B3k=C3=A1s?= To: , , CC: =?UTF-8?q?Bence=20Cs=C3=B3k=C3=A1s?= , , Kamel Bouhara , "William Breathitt Gray" Subject: [PATCH v4 1/2] counter: microchip-tcb-capture: Add IRQ handling Date: Tue, 11 Feb 2025 16:19:13 +0100 Message-ID: <20250211151914.313585-5-csokas.bence@prolan.hu> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250211151914.313585-3-csokas.bence@prolan.hu> References: <20250211151914.313585-3-csokas.bence@prolan.hu> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ESET-AS: R=OK;S=0;OP=CALC;TIME=1739287289;VERSION=7985;MC=2055640490;ID=778525;TRN=0;CRV=0;IPC=;SP=0;SIPS=0;PI=3;F=0 X-ESET-Antispam: OK X-EsetResult: clean, is OK X-EsetId: 37303A2980D94852617160 Add interrupt servicing to allow userspace to wait for the following events: * Change-of-state caused by external trigger * Capture of timer value into RA/RB * Compare to RC register * Overflow Signed-off-by: Bence Cs=C3=B3k=C3=A1s --- 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()` MAINTAINERS | 1 + drivers/counter/microchip-tcb-capture.c | 75 +++++++++++++++++++ .../linux/counter/microchip-tcb-capture.h | 40 ++++++++++ 3 files changed, 116 insertions(+) create mode 100644 include/uapi/linux/counter/microchip-tcb-capture.h diff --git a/MAINTAINERS b/MAINTAINERS index 8e047e20fbd8..0a8ce24ff467 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.c =20 MICROCHIP USB251XB DRIVER M: Richard Leitner diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/micr= ochip-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 =20 #define ATMEL_TC_CMR_MASK (ATMEL_TC_LDRA_RISING | ATMEL_TC_LDRB_FALLING | \ ATMEL_TC_ETRGEDG_RISING | ATMEL_TC_LDBDIS | \ ATMEL_TC_LDBSTOP) =20 +#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) =20 @@ -27,6 +33,7 @@ struct mchp_tc_data { int qdec_mode; int num_channels; int channel[2]; + int irq; }; =20 static const enum counter_function mchp_tc_count_functions[] =3D { @@ -294,6 +301,65 @@ static const struct of_device_id atmel_tc_of_match[] = =3D { { /* sentinel */ } }; =20 +static irqreturn_t mchp_tc_isr(int irq, void *dev_id) +{ + struct counter_device *const counter =3D dev_id; + struct mchp_tc_data *const priv =3D 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 &=3D 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 =3D 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 =3D counter_priv(counter); + int ret =3D devm_request_irq(counter->parent, priv->irq, mchp_tc_isr, 0, + dev_name(counter->parent), counter); + + if (ret < 0) + return ret; + + ret =3D regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], IER), A= TMEL_TC_DEF_IRQS); + if (ret < 0) + return ret; + + ret =3D devm_add_action_or_reset(counter->parent, mchp_tc_irq_remove, pri= v); + 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 =3D ARRAY_SIZE(mchp_tc_count_signals); counter->signals =3D mchp_tc_count_signals; =20 + priv->irq =3D of_irq_get(np->parent, 0); + if (priv->irq =3D=3D -EPROBE_DEFER) + return -EPROBE_DEFER; + if (priv->irq > 0) { + ret =3D mchp_tc_irq_enable(counter); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, "Failed to set up IRQ"); + } + ret =3D 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/u= api/linux/counter/microchip-tcb-capture.h new file mode 100644 index 000000000000..b91d8954f06e --- /dev/null +++ b/include/uapi/linux/counter/microchip-tcb-capture.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * Channel numbers used by the microchip-tcb-capture driver + * Copyright (C) 2025 Bence Cs=C3=B3k=C3=A1s + */ +#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 + */ + +enum counter_mchp_signals { + COUNTER_MCHP_SIG_TIOA, + COUNTER_MCHP_SIG_TIOB, +}; + +enum counter_mchp_event_channels { + COUNTER_MCHP_EVCHN_CV =3D 0, + COUNTER_MCHP_EVCHN_RA =3D 0, + COUNTER_MCHP_EVCHN_RB, + COUNTER_MCHP_EVCHN_RC, +}; + +#endif /* _UAPI_COUNTER_MCHP_TCB_H_ */ --=20 2.48.1