From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roger Quadros Subject: [PATCH 10/17] soc: ti: pruss_intc: Add API to trigger a PRU sysevent Date: Thu, 22 Nov 2018 13:39:06 +0200 Message-ID: <1542886753-17625-11-git-send-email-rogerq@ti.com> References: <1542886753-17625-1-git-send-email-rogerq@ti.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1542886753-17625-1-git-send-email-rogerq@ti.com> Sender: linux-kernel-owner@vger.kernel.org To: tony@atomide.com Cc: robh+dt@kernel.org, bcousson@baylibre.com, ssantosh@kernel.org, ohad@wizery.com, bjorn.andersson@linaro.org, s-anna@ti.com, nsekhar@ti.com, t-kristo@ti.com, nsaulnier@ti.com, jreeder@ti.com, m-karicheri2@ti.com, woods.technical@gmail.com, linux-omap@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, rogerq@ti.com List-Id: devicetree@vger.kernel.org From: Suman Anna The PRUSS INTC can generate an interrupt to various processor subsystems on the SoC through a set of 64 possible PRU system events. These system events can be used by PRU client drivers or applications for event notifications/signalling between PRUs and MPU or other processors. A new API, pruss_intc_trigger() is provided to MPU-side PRU client drivers/applications to be able to trigger an event/interrupt using IRQ numbers provided by the PRUSS-INTC irqdomain chip. Signed-off-by: Andrew F. Davis Signed-off-by: Suman Anna --- drivers/soc/ti/pruss_intc.c | 31 +++++++++++++++++++++++++++++++ include/linux/pruss.h | 7 +++++++ 2 files changed, 38 insertions(+) diff --git a/drivers/soc/ti/pruss_intc.c b/drivers/soc/ti/pruss_intc.c index df6b83b..6158b63 100644 --- a/drivers/soc/ti/pruss_intc.c +++ b/drivers/soc/ti/pruss_intc.c @@ -395,6 +395,37 @@ static void pruss_intc_irq_relres(struct irq_data *data) module_put(THIS_MODULE); } +/** + * pruss_intc_trigger() - trigger a PRU system event + * @irq: linux IRQ number associated with a PRU system event + * + * Trigger an interrupt by signalling a specific PRU system event. + * This can be used by PRUSS client users to raise/send an event to + * a PRU or any other core that is listening on the host interrupt + * mapped to that specific PRU system event. The @irq variable is the + * Linux IRQ number associated with a specific PRU system event that + * a client user/application uses. The interrupt mappings for this is + * provided by the PRUSS INTC irqchip instance. + * + * Returns 0 on success, or an error value upon failure. + */ +int pruss_intc_trigger(unsigned int irq) +{ + struct irq_desc *desc; + + if (irq <= 0) + return -EINVAL; + + desc = irq_to_desc(irq); + if (!desc) + return -EINVAL; + + pruss_intc_irq_retrigger(&desc->irq_data); + + return 0; +} +EXPORT_SYMBOL_GPL(pruss_intc_trigger); + static int pruss_intc_irq_domain_map(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw) { diff --git a/include/linux/pruss.h b/include/linux/pruss.h index 198ae25..768b698 100644 --- a/include/linux/pruss.h +++ b/include/linux/pruss.h @@ -41,6 +41,8 @@ int pruss_request_mem_region(struct pruss *pruss, enum pruss_mem mem_id, int pruss_release_mem_region(struct pruss *pruss, struct pruss_mem_region *region); +int pruss_intc_trigger(unsigned int irq); + #else static inline int pruss_request_mem_region(struct pruss *pruss, @@ -56,6 +58,11 @@ static inline int pruss_release_mem_region(struct pruss *pruss, return -ENOTSUPP; } +static inline int pruss_intc_trigger(unsigned int irq) +{ + return -ENOTSUPP; +} + #endif /* CONFIG_TI_PRUSS */ #endif /* __LINUX_PRUSS_H */ -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki