Message-ID: <1549290167-876-5-git-send-email-rogerq@ti.com>
Date:   Mon, 4 Feb 2019 16:22:37 +0200
From:   Roger Quadros <rogerq@...com>
To:     <tony@...mide.com>, <ohad@...ery.com>, <bjorn.andersson@...aro.org>
CC:     <s-anna@...com>, <david@...hnology.com>, <nsekhar@...com>,
        <t-kristo@...com>, <nsaulnier@...com>, <jreeder@...com>,
        <m-karicheri2@...com>, <woods.technical@...il.com>,
        <linux-omap@...r.kernel.org>, <linux-remoteproc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <rogerq@...com>, "Andrew F. Davis" <afd@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>
Subject: [PATCH v2 04/14] irqchip: pruss: Add a PRUSS irqchip driver for PRUSS interrupts

From: "Andrew F. Davis" <afd@...com>

The Programmable Real-Time Unit Subsystem (PRUSS) contains an
interrupt controller (INTC) that can handle various system input
events and post interrupts back to the device-level initiators.
The INTC can support upto 64 input events with individual control
configuration and hardware prioritization. These events are mapped
onto 10 interrupt signals through two levels of many-to-one mapping
support. Different interrupt signals are routed to the individual
PRU cores or to the host CPU.

The PRUSS INTC platform driver manages this PRUSS interrupt
controller and implements an irqchip driver to provide a Linux
standard way for the PRU client users to enable/disable/ack/
re-trigger a PRUSS system event. The system events to interrupt
channels and host interrupts relies on the mapping configuration
provided through a firmware resource table for now. This will be
revisited and enhanced in the future for a better interface. The
mappings will currently be programmed during the boot/shutdown
of the PRU.

The PRUSS INTC module is reference counted during the interrupt
setup phase through the irqchip's irq_request_resources() and
irq_release_resources() ops. This restricts the module from being
removed as long as there are active interrupt users.

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. An 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.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Andrew F. Davis <afd@...com>
Signed-off-by: Suman Anna <s-anna@...com>
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/irqchip/Makefile               |   1 +
 drivers/irqchip/irq-pruss-intc.c       | 630 +++++++++++++++++++++++++++++++++
 include/linux/irqchip/irq-pruss-intc.h |  94 +++++
 3 files changed, 725 insertions(+)
 create mode 100644 drivers/irqchip/irq-pruss-intc.c
 create mode 100644 include/linux/irqchip/irq-pruss-intc.h

diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index c93713d..e309101 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -94,3 +94,4 @@ obj-$(CONFIG_CSKY_APB_INTC)		+= irq-csky-apb-intc.o
 obj-$(CONFIG_SIFIVE_PLIC)		+= irq-sifive-plic.o
 obj-$(CONFIG_IMX_IRQSTEER)		+= irq-imx-irqsteer.o
 obj-$(CONFIG_MADERA_IRQ)		+= irq-madera.o
+obj-$(CONFIG_TI_PRUSS)			+= irq-pruss-intc.o
diff --git a/drivers/irqchip/irq-pruss-intc.c b/drivers/irqchip/irq-pruss-intc.c
new file mode 100644
index 0000000..0288535
--- /dev/null
+++ b/drivers/irqchip/irq-pruss-intc.c
@@ -0,0 +1,630 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PRU-ICSS INTC IRQChip driver for various TI SoCs
+ *
+ * Copyright (C) 2016-2019 Texas Instruments Incorporated - http://www.ti.com/
+ *	Andrew F. Davis <afd@...com>
+ *	Suman Anna <s-anna@...com>
+ */
+
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqchip/irq-pruss-intc.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+/*
+ * Number of host interrupts reaching the main MPU sub-system. Note that this
+ * is not the same as the total number of host interrupts supported by the PRUSS
+ * INTC instance
+ */
+#define MAX_HOST_NUM_IRQS	8
+
+/* minimum starting host interrupt number for MPU */
+#define MIN_PRU_HOST_INT	2
+
+/* maximum number of host interrupts */
+#define MAX_PRU_HOST_INT	10
+
+/* PRU_ICSS_INTC registers */
+#define PRU_INTC_REVID		0x0000
+#define PRU_INTC_CR		0x0004
+#define PRU_INTC_GER		0x0010
+#define PRU_INTC_GNLR		0x001C
+#define PRU_INTC_SISR		0x0020
+#define PRU_INTC_SICR		0x0024
+#define PRU_INTC_EISR		0x0028
+#define PRU_INTC_EICR		0x002C
+#define PRU_INTC_HIEISR		0x0034
+#define PRU_INTC_HIDISR		0x0038
+#define PRU_INTC_GPIR		0x0080
+#define PRU_INTC_SRSR0		0x0200
+#define PRU_INTC_SRSR1		0x0204
+#define PRU_INTC_SECR0		0x0280
+#define PRU_INTC_SECR1		0x0284
+#define PRU_INTC_ESR0		0x0300
+#define PRU_INTC_ESR1		0x0304
+#define PRU_INTC_ECR0		0x0380
+#define PRU_INTC_ECR1		0x0384
+#define PRU_INTC_CMR(x)		(0x0400 + (x) * 4)
+#define PRU_INTC_HMR(x)		(0x0800 + (x) * 4)
+#define PRU_INTC_HIPIR(x)	(0x0900 + (x) * 4)
+#define PRU_INTC_SIPR0		0x0D00
+#define PRU_INTC_SIPR1		0x0D04
+#define PRU_INTC_SITR0		0x0D80
+#define PRU_INTC_SITR1		0x0D84
+#define PRU_INTC_HINLR(x)	(0x1100 + (x) * 4)
+#define PRU_INTC_HIER		0x1500
+
+/* HIPIR register bit-fields */
+#define INTC_HIPIR_NONE_HINT	0x80000000
+
+static const char * const irq_names[] = {
+	"host2", "host3", "host4", "host5", "host6", "host7", "host8", "host9",
+};
+
+/**
+ * struct pruss_intc_match_data - match data to handle SoC variations
+ * @no_host7_intr: flag denoting the absence of host7 interrupt into MPU
+ */
+struct pruss_intc_match_data {
+	bool no_host7_intr;
+};
+
+/**
+ * struct pruss_intc - PRUSS interrupt controller structure
+ * @irqs: kernel irq numbers corresponding to PRUSS host interrupts
+ * @mem: base virtual address of INTC register space
+ * @irqchip: irq chip for this interrupt controller
+ * @domain: irq domain for this interrupt controller
+ * @config_map: stored INTC configuration mapping data
+ * @lock: mutex to serialize access to INTCa
+ * @host_mask: indicate which HOST IRQs are enabled
+ */
+struct pruss_intc {
+	unsigned int irqs[MAX_HOST_NUM_IRQS];
+	void __iomem *base;
+	struct irq_chip *irqchip;
+	struct irq_domain *domain;
+	struct pruss_intc_config config_map;
+	struct mutex lock; /* PRUSS INTC lock */
+	u32 host_mask;
+};
+
+static inline u32 pruss_intc_read_reg(struct pruss_intc *intc, unsigned int reg)
+{
+	return readl_relaxed(intc->base + reg);
+}
+
+static inline void pruss_intc_write_reg(struct pruss_intc *intc,
+					unsigned int reg, u32 val)
+{
+	writel_relaxed(val, intc->base + reg);
+}
+
+static int pruss_intc_check_write(struct pruss_intc *intc, unsigned int reg,
+				  unsigned int sysevent)
+{
+	if (!intc)
+		return -EINVAL;
+
+	if (sysevent >= MAX_PRU_SYS_EVENTS)
+		return -EINVAL;
+
+	pruss_intc_write_reg(intc, reg, sysevent);
+
+	return 0;
+}
+
+static struct pruss_intc *dev_to_intc(struct device *user_dev)
+{
+	struct device_node *np;
+	struct platform_device *pdev;
+	struct pruss_intc *intc;
+
+	np = of_irq_find_parent(user_dev->of_node);
+	if (!np)
+		return ERR_PTR(-ENODEV);
+
+	pdev = of_find_device_by_node(np);
+	if (!pdev)
+		return ERR_PTR(-EPROBE_DEFER); /* Not probed yet? */
+
+	intc = platform_get_drvdata(pdev);
+	if (!intc)
+		return ERR_PTR(-EINVAL);
+
+	return intc;
+}
+
+/**
+ * pruss_intc_configure() - configure the PRUSS INTC
+ * @dev: device
+ * @intc_config: PRU core-specific INTC configuration
+ *
+ * Configures the PRUSS INTC with the provided configuration from
+ * a PRU core. Any existing event to channel mappings or channel to
+ * host interrupt mappings are checked to make sure there are no
+ * conflicting configuration between both the PRU cores. The function
+ * is intended to be used only by the PRU remoteproc driver.
+ *
+ * Returns 0 on success, or a suitable error code otherwise
+ */
+int pruss_intc_configure(struct device *dev,
+			 struct pruss_intc_config *intc_config)
+{
+	struct pruss_intc *intc;
+	int i, idx, ret;
+	s8 ch, host;
+	u64 sysevt_mask = 0;
+	u32 ch_mask = 0;
+	u32 host_mask = 0;
+	u32 val;
+
+	intc = dev_to_intc(dev);
+	if (IS_ERR(intc))
+		return PTR_ERR(intc);
+
+	mutex_lock(&intc->lock);
+
+	/*
+	 * configure channel map registers - each register holds map info
+	 * for 4 events, with each event occupying the lower nibble in
+	 * a register byte address in little-endian fashion
+	 */
+	for (i = 0; i < ARRAY_SIZE(intc_config->sysev_to_ch); i++) {
+		ch = intc_config->sysev_to_ch[i];
+		if (ch < 0)
+			continue;
+
+		/* check if sysevent already assigned */
+		if (intc->config_map.sysev_to_ch[i] != -1) {
+			dev_err(dev, "event %d (req. channel %d) already assigned to channel %d\n",
+				i, ch, intc->config_map.sysev_to_ch[i]);
+			ret = -EEXIST;
+			goto unlock;
+		}
+
+		intc->config_map.sysev_to_ch[i] = ch;
+
+		idx = i / 4;
+		val = pruss_intc_read_reg(intc, PRU_INTC_CMR(idx));
+		val |= ch << ((i & 3) * 8);
+		pruss_intc_write_reg(intc, PRU_INTC_CMR(idx), val);
+		sysevt_mask |= BIT_ULL(i);
+		ch_mask |= BIT(ch);
+
+		dev_dbg(dev, "SYSEV%d -> CH%d (CMR%d 0x%08x)\n", i, ch, idx,
+			pruss_intc_read_reg(intc, PRU_INTC_CMR(idx)));
+	}
+
+	/*
+	 * set host map registers - each register holds map info for
+	 * 4 channels, with each channel occupying the lower nibble in
+	 * a register byte address in little-endian fashion
+	 */
+	for (i = 0; i < ARRAY_SIZE(intc_config->ch_to_host); i++) {
+		host = intc_config->ch_to_host[i];
+		if (host < 0)
+			continue;
+
+		/* check if channel already assigned */
+		if (intc->config_map.ch_to_host[i] != -1) {
+			dev_err(dev, "channel %d (req. intr_no %d) already assigned to intr_no %d\n",
+				i, host, intc->config_map.ch_to_host[i]);
+			ret = -EEXIST;
+			goto unlock;
+		}
+
+		/* check if host intr is already in use by other PRU */
+		if (intc->host_mask & (1U << host)) {
+			dev_err(dev, "%s: host intr %d already in use\n",
+				__func__, host);
+			ret = -EEXIST;
+			goto unlock;
+		}
+
+		intc->config_map.ch_to_host[i] = host;
+
+		idx = i / 4;
+
+		val = pruss_intc_read_reg(intc, PRU_INTC_HMR(idx));
+		val |= host << ((i & 3) * 8);
+		pruss_intc_write_reg(intc, PRU_INTC_HMR(idx), val);
+
+		ch_mask |= BIT(i);
+		host_mask |= BIT(host);
+
+		dev_dbg(dev, "CH%d -> HOST%d (HMR%d 0x%08x)\n", i, host, idx,
+			pruss_intc_read_reg(intc, PRU_INTC_HMR(idx)));
+	}
+
+	dev_info(dev, "intc: config: system_events = 0x%016llx intr_channels = 0x%08x host_intr = 0x%08x\n",
+		 sysevt_mask, ch_mask, host_mask);
+
+	/* enable system events, writing 0 has no-effect */
+	pruss_intc_write_reg(intc, PRU_INTC_ESR0, lower_32_bits(sysevt_mask));
+	pruss_intc_write_reg(intc, PRU_INTC_SECR0, lower_32_bits(sysevt_mask));
+	pruss_intc_write_reg(intc, PRU_INTC_ESR1, upper_32_bits(sysevt_mask));
+	pruss_intc_write_reg(intc, PRU_INTC_SECR1, upper_32_bits(sysevt_mask));
+
+	/* enable host interrupts */
+	for (i = 0; i < MAX_PRU_HOST_INT; i++) {
+		if (host_mask & BIT(i))
+			pruss_intc_write_reg(intc, PRU_INTC_HIEISR, i);
+	}
+
+	/* global interrupt enable */
+	pruss_intc_write_reg(intc, PRU_INTC_GER, 1);
+
+	intc->host_mask |= host_mask;
+
+	mutex_unlock(&intc->lock);
+	return 0;
+
+unlock:
+	mutex_unlock(&intc->lock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(pruss_intc_configure);
+
+/**
+ * pruss_intc_unconfigure() - unconfigure the PRUSS INTC
+ * @dev: device
+ * @intc_config: PRU core specific INTC configuration
+ *
+ * Undo whatever was done in pruss_intc_configure() for a PRU core.
+ * It should be sufficient to just mark the resources free in the
+ * global map and disable the host interrupts and sysevents.
+ */
+int pruss_intc_unconfigure(struct device *dev,
+			   struct pruss_intc_config *intc_config)
+{
+	struct pruss_intc *intc;
+	int i;
+	s8 ch, host;
+	u64 sysevt_mask = 0;
+	u32 host_mask = 0;
+
+	intc = dev_to_intc(dev);
+	if (IS_ERR(intc))
+		return PTR_ERR(intc);
+
+	mutex_lock(&intc->lock);
+
+	for (i = 0; i < ARRAY_SIZE(intc_config->sysev_to_ch); i++) {
+		ch = intc_config->sysev_to_ch[i];
+		if (ch < 0)
+			continue;
+
+		/* mark sysevent free in global map */
+		intc->config_map.sysev_to_ch[i] = -1;
+		sysevt_mask |= BIT_ULL(i);
+	}
+
+	for (i = 0; i < ARRAY_SIZE(intc_config->ch_to_host); i++) {
+		host = intc_config->ch_to_host[i];
+		if (host < 0)
+			continue;
+
+		/* mark channel free in global map */
+		intc->config_map.ch_to_host[i] = -1;
+		host_mask |= BIT(host);
+	}
+
+	dev_info(dev, "intc: unconfig: system_events = 0x%016llx host_intr = 0x%08x\n",
+		 sysevt_mask, host_mask);
+
+	/* disable system events, writing 0 has no-effect */
+	pruss_intc_write_reg(intc, PRU_INTC_ECR0, lower_32_bits(sysevt_mask));
+	pruss_intc_write_reg(intc, PRU_INTC_ECR1, upper_32_bits(sysevt_mask));
+	/* clear any pending status */
+	pruss_intc_write_reg(intc, PRU_INTC_SECR0, lower_32_bits(sysevt_mask));
+	pruss_intc_write_reg(intc, PRU_INTC_SECR1, upper_32_bits(sysevt_mask));
+
+	/* disable host interrupts */
+	for (i = 0; i < MAX_PRU_HOST_INT; i++) {
+		if (host_mask & BIT(i))
+			pruss_intc_write_reg(intc, PRU_INTC_HIDISR, i);
+	}
+
+	intc->host_mask &= ~host_mask;
+	mutex_unlock(&intc->lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pruss_intc_unconfigure);
+
+static void pruss_intc_init(struct pruss_intc *intc)
+{
+	int i;
+
+	/* configure polarity to active high for all system interrupts */
+	pruss_intc_write_reg(intc, PRU_INTC_SIPR0, 0xffffffff);
+	pruss_intc_write_reg(intc, PRU_INTC_SIPR1, 0xffffffff);
+
+	/* configure type to pulse interrupt for all system interrupts */
+	pruss_intc_write_reg(intc, PRU_INTC_SITR0, 0);
+	pruss_intc_write_reg(intc, PRU_INTC_SITR1, 0);
+
+	/* clear all 16 interrupt channel map registers */
+	for (i = 0; i < 16; i++)
+		pruss_intc_write_reg(intc, PRU_INTC_CMR(i), 0);
+
+	/* clear all 3 host interrupt map registers */
+	for (i = 0; i < 3; i++)
+		pruss_intc_write_reg(intc, PRU_INTC_HMR(i), 0);
+}
+
+static void pruss_intc_irq_ack(struct irq_data *data)
+{
+	struct pruss_intc *intc = irq_data_get_irq_chip_data(data);
+	unsigned int hwirq = data->hwirq;
+
+	pruss_intc_check_write(intc, PRU_INTC_SICR, hwirq);
+}
+
+static void pruss_intc_irq_mask(struct irq_data *data)
+{
+	struct pruss_intc *intc = irq_data_get_irq_chip_data(data);
+	unsigned int hwirq = data->hwirq;
+
+	pruss_intc_check_write(intc, PRU_INTC_EICR, hwirq);
+}
+
+static void pruss_intc_irq_unmask(struct irq_data *data)
+{
+	struct pruss_intc *intc = irq_data_get_irq_chip_data(data);
+	unsigned int hwirq = data->hwirq;
+
+	pruss_intc_check_write(intc, PRU_INTC_EISR, hwirq);
+}
+
+static int pruss_intc_irq_retrigger(struct irq_data *data)
+{
+	struct pruss_intc *intc = irq_data_get_irq_chip_data(data);
+	unsigned int hwirq = data->hwirq;
+
+	return pruss_intc_check_write(intc, PRU_INTC_SISR, hwirq);
+}
+
+static int pruss_intc_irq_reqres(struct irq_data *data)
+{
+	if (!try_module_get(THIS_MODULE))
+		return -ENODEV;
+
+	return 0;
+}
+
+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)
+{
+	struct pruss_intc *intc = d->host_data;
+
+	irq_set_chip_data(virq, intc);
+	irq_set_chip_and_handler(virq, intc->irqchip, handle_level_irq);
+
+	return 0;
+}
+
+static void pruss_intc_irq_domain_unmap(struct irq_domain *d, unsigned int virq)
+{
+	irq_set_chip_and_handler(virq, NULL, NULL);
+	irq_set_chip_data(virq, NULL);
+}
+
+static const struct irq_domain_ops pruss_intc_irq_domain_ops = {
+	.xlate	= irq_domain_xlate_onecell,
+	.map	= pruss_intc_irq_domain_map,
+	.unmap	= pruss_intc_irq_domain_unmap,
+};
+
+static void pruss_intc_irq_handler(struct irq_desc *desc)
+{
+	unsigned int irq = irq_desc_get_irq(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	struct pruss_intc *intc = irq_get_handler_data(irq);
+	u32 hipir;
+	unsigned int virq;
+	int i, hwirq;
+
+	chained_irq_enter(chip, desc);
+
+	/* find our host irq number */
+	for (i = 0; i < MAX_HOST_NUM_IRQS; i++)
+		if (intc->irqs[i] == irq)
+			break;
+	if (i == MAX_HOST_NUM_IRQS)
+		goto err;
+
+	i += MIN_PRU_HOST_INT;
+
+	/* get highest priority pending PRUSS system event */
+	hipir = pruss_intc_read_reg(intc, PRU_INTC_HIPIR(i));
+	while (!(hipir & BIT(31))) {
+		hwirq = hipir & GENMASK(9, 0);
+		virq = irq_linear_revmap(intc->domain, hwirq);
+
+		/*
+		 * XXX: manually ACK any system events that do not have a
+		 * handler mapped yet
+		 */
+		if (unlikely(!virq))
+			pruss_intc_check_write(intc, PRU_INTC_SICR, hwirq);
+		else
+			generic_handle_irq(virq);
+
+		/* get next system event */
+		hipir = pruss_intc_read_reg(intc, PRU_INTC_HIPIR(i));
+	}
+err:
+	chained_irq_exit(chip, desc);
+}
+
+static int pruss_intc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct pruss_intc *intc;
+	struct resource *res;
+	struct irq_chip *irqchip;
+	int i, irq;
+	const struct pruss_intc_match_data *data;
+	bool skip_host7;
+
+	data = of_device_get_match_data(dev);
+	skip_host7 = data ? data->no_host7_intr : false;
+
+	intc = devm_kzalloc(dev, sizeof(*intc), GFP_KERNEL);
+	if (!intc)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, intc);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intc");
+	intc->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(intc->base)) {
+		dev_err(dev, "failed to parse and map intc memory resource\n");
+		return PTR_ERR(intc->base);
+	}
+
+	mutex_init(&intc->lock);
+
+	for (i = 0; i < ARRAY_SIZE(intc->config_map.sysev_to_ch); i++)
+		intc->config_map.sysev_to_ch[i] = -1;
+
+	for (i = 0; i < ARRAY_SIZE(intc->config_map.ch_to_host); i++)
+		intc->config_map.ch_to_host[i] = -1;
+
+	pruss_intc_init(intc);
+
+	irqchip = devm_kzalloc(dev, sizeof(*irqchip), GFP_KERNEL);
+	if (!irqchip)
+		return -ENOMEM;
+
+	irqchip->irq_ack = pruss_intc_irq_ack;
+	irqchip->irq_mask = pruss_intc_irq_mask;
+	irqchip->irq_unmask = pruss_intc_irq_unmask;
+	irqchip->irq_retrigger = pruss_intc_irq_retrigger;
+	irqchip->irq_request_resources = pruss_intc_irq_reqres;
+	irqchip->irq_release_resources = pruss_intc_irq_relres;
+	irqchip->name = dev_name(dev);
+	intc->irqchip = irqchip;
+
+	/* always 64 events */
+	intc->domain = irq_domain_add_linear(dev->of_node, MAX_PRU_SYS_EVENTS,
+					     &pruss_intc_irq_domain_ops, intc);
+	if (!intc->domain)
+		return -ENOMEM;
+
+	for (i = 0; i < MAX_HOST_NUM_IRQS; i++) {
+		irq = platform_get_irq_byname(pdev, irq_names[i]);
+		if (irq < 0) {
+			if (!strcmp(irq_names[i], "host7") && !!skip_host7)
+				continue;
+
+			dev_err(dev->parent, "platform_get_irq_byname failed for %s : %d\n",
+				irq_names[i], irq);
+			goto fail_irq;
+		}
+
+		intc->irqs[i] = irq;
+		irq_set_handler_data(irq, intc);
+		irq_set_chained_handler(irq, pruss_intc_irq_handler);
+	}
+
+	return 0;
+
+fail_irq:
+	irq_domain_remove(intc->domain);
+	return irq;
+}
+
+static int pruss_intc_remove(struct platform_device *pdev)
+{
+	struct pruss_intc *intc = platform_get_drvdata(pdev);
+	unsigned int hwirq;
+
+	if (intc->domain) {
+		for (hwirq = 0; hwirq < MAX_PRU_SYS_EVENTS; hwirq++)
+			irq_dispose_mapping(irq_find_mapping(intc->domain,
+							     hwirq));
+		irq_domain_remove(intc->domain);
+	}
+
+	return 0;
+}
+
+static const struct pruss_intc_match_data am437x_pruss_intc_data = {
+	.no_host7_intr = true,
+};
+
+static const struct of_device_id pruss_intc_of_match[] = {
+	{
+		.compatible = "ti,am3356-pruss-intc",
+		.data = NULL,
+	},
+	{
+		.compatible = "ti,am4376-pruss-intc",
+		.data = &am437x_pruss_intc_data,
+	},
+	{
+		.compatible = "ti,am5728-pruss-intc",
+		.data = NULL,
+	},
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, pruss_intc_of_match);
+
+static struct platform_driver pruss_intc_driver = {
+	.driver = {
+		.name = "pruss-intc",
+		.of_match_table = pruss_intc_of_match,
+	},
+	.probe  = pruss_intc_probe,
+	.remove = pruss_intc_remove,
+};
+module_platform_driver(pruss_intc_driver);
+
+MODULE_AUTHOR("Andrew F. Davis <afd@...com>");
+MODULE_AUTHOR("Suman Anna <s-anna@...com>");
+MODULE_DESCRIPTION("PRU-ICSS INTC Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/irqchip/irq-pruss-intc.h b/include/linux/irqchip/irq-pruss-intc.h
new file mode 100644
index 0000000..4538a0b
--- /dev/null
+++ b/include/linux/irqchip/irq-pruss-intc.h
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/**
+ * irq-pruss-intc.h - PRU-ICSS INTC management
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
+ */
+
+#ifndef __INCLUDE_LINUX_IRQCHIP_IRQ_PRUSS_INTC_H
+#define __INCLUDE_LINUX_IRQCHIP_IRQ_PRUSS_INTC_H
+
+/* maximum number of system events */
+#define MAX_PRU_SYS_EVENTS	64
+
+/* maximum number of interrupt channels */
+#define MAX_PRU_CHANNELS	10
+
+/**
+ * struct pruss_intc_config - INTC configuration info
+ * @sysev_to_ch: system events to channel mapping information
+ * @ch_to_host: interrupt channel to host interrupt information
+ */
+struct pruss_intc_config {
+	s8 sysev_to_ch[MAX_PRU_SYS_EVENTS];
+	s8 ch_to_host[MAX_PRU_CHANNELS];
+};
+
+#if IS_ENABLED(CONFIG_TI_PRUSS)
+
+/**
+ * pruss_intc_configure() - configure the PRUSS INTC
+ * @dev: device
+ * @intc_config: PRU core-specific INTC configuration
+ *
+ * Configures the PRUSS INTC with the provided configuration from
+ * a PRU core. Any existing event to channel mappings or channel to
+ * host interrupt mappings are checked to make sure there are no
+ * conflicting configuration between both the PRU cores. The function
+ * is intended to be used only by the PRU remoteproc driver.
+ *
+ * Returns 0 on success, or a suitable error code otherwise
+ */
+int pruss_intc_configure(struct device *dev,
+			 struct pruss_intc_config *intc_config);
+
+/**
+ * pruss_intc_unconfigure() - unconfigure the PRUSS INTC
+ * @dev: device
+ * @intc_config: PRU core specific INTC configuration
+ *
+ * Undo whatever was done in pruss_intc_configure() for a PRU core.
+ * It should be sufficient to just mark the resources free in the
+ * global map and disable the host interrupts and sysevents.
+ */
+int pruss_intc_unconfigure(struct device *dev,
+			   struct pruss_intc_config *intc_config);
+/**
+ * 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);
+
+#else
+
+static inline int pruss_intc_configure(struct device *dev,
+				       struct pruss_intc_config *intc_config)
+{
+	return -ENOTSUPP;
+}
+
+static inline int pruss_intc_unconfigure(struct device *dev,
+					 struct pruss_intc_config *intc_config)
+{
+	return -ENOTSUPP;
+}
+
+static inline int pruss_intc_trigger(unsigned int irq)
+{
+	return -ENOTSUPP;
+}
+
+#endif	/* CONFIG_TI_PRUSS */
+
+#endif /* __INCLUDE_LINUX_IRQCHIP_IRQ_OMAP_INTC_H */
+
-- 
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