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Subject[PATCH v5 08/10] irqchip: ti-sci-inta: Add support for Interrupt Aggregator driver
Date
Texas Instruments' K3 generation SoCs has an IP Interrupt Aggregator
which is an interrupt controller that does the following:
- Converts events to interrupts that can be understood by
an interrupt router.
- Allows for multiplexing of events to interrupts.

Configuration of the interrupt aggregator registers can only be done by
a system co-processor and the driver needs to send a message to this
co processor over TISCI protocol.

Add support for Interrupt Aggregator driver with 2 IRQ Domains:
- INTA MSI domain that interfaces the devices using which interrupts can be
allocated dynamically.
- INTA domain that is parent to the MSI domain that manages the interrupt
resources.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
Changes since v4:
- Allocate the INTA output interrupts during probe.

MAINTAINERS | 1 +
drivers/irqchip/Kconfig | 12 +
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-ti-sci-inta.c | 531 ++++++++++++++++++++++++++++++
4 files changed, 545 insertions(+)
create mode 100644 drivers/irqchip/irq-ti-sci-inta.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 970c732b7158..44a3392239d9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15069,6 +15069,7 @@ F: Documentation/devicetree/bindings/interrupt-controller/ti,sci-inta.txt
F: drivers/irqchip/irq-ti-sci-intr.c
F: drivers/irqchip/irq-ti-sci-common.c
F: drivers/irqchip/irq-ti-sci-common.h
+F: drivers/irqchip/irq-ti-sci-inta.c

Texas Instruments ASoC drivers
M: Peter Ujfalusi <peter.ujfalusi@ti.com>
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index a8d9bed0254b..d16fd39408ad 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -417,6 +417,18 @@ config TI_SCI_INTR_IRQCHIP
If you wish to use interrupt router irq resources managed by the
TI System Controller, say Y here. Otherwise, say N.

+config TI_SCI_INTA_IRQCHIP
+ bool
+ depends on TI_SCI_PROTOCOL && ARCH_K3
+ select IRQ_DOMAIN
+ select IRQ_DOMAIN_HIERARCHY
+ select K3_INTA_MSI_DOMAIN
+ help
+ This enables the irqchip driver support for K3 Interrupt aggregator
+ over TI System Control Interface available on some new TI's SoCs.
+ If you wish to use interrupt aggregator irq resources managed by the
+ TI System Controller, say Y here. Otherwise, say N.
+
endmenu

config SIFIVE_PLIC
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 0499fae148a9..caf6d084e0d4 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -95,3 +95,4 @@ 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_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o irq-ti-sci-common.o
+obj-$(CONFIG_TI_SCI_INTA_IRQCHIP) += irq-ti-sci-inta.o irq-ti-sci-common.o
diff --git a/drivers/irqchip/irq-ti-sci-inta.c b/drivers/irqchip/irq-ti-sci-inta.c
new file mode 100644
index 000000000000..131944fec6fe
--- /dev/null
+++ b/drivers/irqchip/irq-ti-sci-inta.c
@@ -0,0 +1,531 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Texas Instruments' K3 Interrupt Aggregator irqchip driver
+ *
+ * Copyright (C) 2018-2019 Texas Instruments Incorporated - http://www.ti.com/
+ * Lokesh Vutla <lokeshvutla@ti.com>
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/msi.h>
+#include <linux/irqchip.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/irqdomain.h>
+#include <linux/interrupt.h>
+#include <linux/soc/ti/ti_sci_protocol.h>
+#include <linux/soc/ti/k3_inta_msi.h>
+#include <linux/irqchip/chained_irq.h>
+#include <asm-generic/msi.h>
+#include "irq-ti-sci-common.h"
+
+#define MAX_EVENTS_PER_VINT 64
+
+#define VINT_ENABLE_SET_OFFSET 0x0
+#define VINT_ENABLE_CLR_OFFSET 0x8
+#define VINT_STATUS_OFFSET 0x18
+
+/**
+ * struct ti_sci_inta_event_desc - Description of an event coming to
+ * Interrupt Aggregator.
+ * @global_event: Global event number corresponding to this event
+ * @src_id: TISCI device ID of the event source
+ * @src_index: Event source index within the device.
+ */
+struct ti_sci_inta_event_desc {
+ u16 global_event;
+ u16 src_id;
+ u16 src_index;
+};
+
+/**
+ * struct ti_sci_inta_vint_desc - Description of a virtual interrupt coming out
+ * of Interrupt Aggregator.
+ * @domain: Pointer to IRQ domain to which this vint belongs.
+ * @list: List entry for the vint list
+ * @event_lock: lock to guard the event map
+ * @event_map: Bitmap to manage the allocation of events to vint.
+ * @events: Array of event descriptors assigned to this vint.
+ * @parent_virq: Linux IRQ number that gets attached to parent
+ * @vint_id: TISCI vint ID
+ */
+struct ti_sci_inta_vint_desc {
+ struct irq_domain *domain;
+ struct list_head list;
+ struct mutex event_lock;
+ unsigned long *event_map;
+ struct ti_sci_inta_event_desc events[MAX_EVENTS_PER_VINT];
+ unsigned int parent_virq;
+ u16 vint_id;
+};
+
+/**
+ * struct ti_sci_inta_irq_domain - Structure representing a TISCI based
+ * Interrupt Aggregator IRQ domain.
+ * @sci: Pointer to TISCI handle
+ * @vint: TISCI resource pointer representing IA inerrupts.
+ * @global_event: TISCI resource pointer representing global events.
+ * @vint_list: List of the vints active in the system
+ * @base: Base address of the memory mapped IO registers
+ * @ia_id: TISCI device ID of this Interrupt Aggregator.
+ */
+struct ti_sci_inta_irq_domain {
+ const struct ti_sci_handle *sci;
+ struct ti_sci_resource *vint;
+ struct ti_sci_resource *global_event;
+ struct list_head vint_list;
+ void __iomem *base;
+ u16 ia_id;
+};
+
+static int __get_event_index(struct ti_sci_inta_vint_desc *vint_desc,
+ int global_event)
+{
+ int event_index = -ENODEV, i;
+
+ for (i = 0; i < MAX_EVENTS_PER_VINT; i++) {
+ if (vint_desc->events[i].global_event == global_event) {
+ event_index = i;
+ break;
+ }
+ }
+
+ return event_index;
+}
+
+static void __ti_sci_inta_manage_event(struct irq_data *data, u32 offset)
+{
+ struct ti_sci_inta_vint_desc *vint_desc;
+ struct ti_sci_inta_irq_domain *inta;
+ int global_event, event_index;
+
+ vint_desc = irq_data_get_irq_chip_data(data);
+ global_event = data->hwirq;
+ event_index = __get_event_index(vint_desc, global_event);
+ inta = vint_desc->domain->host_data;
+
+ if (event_index < 0)
+ return;
+
+ writeq_relaxed(BIT(event_index), inta->base +
+ vint_desc->vint_id * 0x1000 + offset);
+}
+
+static void ti_sci_inta_mask_irq(struct irq_data *data)
+{
+ __ti_sci_inta_manage_event(data, VINT_ENABLE_CLR_OFFSET);
+}
+
+static void ti_sci_inta_unmask_irq(struct irq_data *data)
+{
+ __ti_sci_inta_manage_event(data, VINT_ENABLE_SET_OFFSET);
+}
+
+static int ti_sci_inta_set_affinity(struct irq_data *d,
+ const struct cpumask *mask_val, bool force)
+{
+ struct ti_sci_inta_vint_desc *vint_desc = irq_data_get_irq_chip_data(d);
+ struct irq_chip *chip = irq_get_chip(vint_desc->parent_virq);
+ struct irq_data *data = irq_get_irq_data(vint_desc->parent_virq);
+
+ if (chip && chip->irq_set_affinity)
+ return chip->irq_set_affinity(data, mask_val, force);
+ else
+ return -EINVAL;
+}
+
+static struct irq_chip ti_sci_inta_irq_chip = {
+ .name = "INTA",
+ .irq_mask = ti_sci_inta_mask_irq,
+ .irq_unmask = ti_sci_inta_unmask_irq,
+ .irq_set_affinity = ti_sci_inta_set_affinity,
+};
+
+/**
+ * ti_sci_free_event_irq() - Free an event from vint
+ * @domain: Pointer to Interrupt Aggregator IRQ domain
+ * @vint_desc: Virtual interrupt descriptor containing the event.
+ * @global_event: Global event id to be freed.
+ */
+static void ti_sci_free_event_irq(struct irq_domain *domain,
+ struct ti_sci_inta_vint_desc *vint_desc,
+ u16 global_event)
+{
+ struct ti_sci_inta_irq_domain *inta = domain->host_data;
+ struct ti_sci_inta_event_desc *event_desc;
+ int event_index = 0;
+
+ event_index = __get_event_index(vint_desc, global_event);
+ event_desc = &vint_desc->events[event_index];
+ inta->sci->ops.rm_irq_ops.free_event_map(inta->sci,
+ event_desc->src_id,
+ event_desc->src_index,
+ inta->ia_id,
+ vint_desc->vint_id,
+ event_desc->global_event,
+ event_index);
+
+ clear_bit(event_index, vint_desc->event_map);
+
+ ti_sci_release_resource(inta->global_event, event_desc->global_event);
+}
+
+static void ti_sci_inta_free_vint(struct ti_sci_inta_irq_domain *inta,
+ struct ti_sci_inta_vint_desc *vint_desc)
+{
+ /* If all events are cleared, release vint */
+ if (find_first_bit(vint_desc->event_map, MAX_EVENTS_PER_VINT) ==
+ MAX_EVENTS_PER_VINT)
+ ti_sci_release_resource(inta->vint, vint_desc->vint_id);
+}
+
+/**
+ * ti_sci_inta_irq_domain_free() - Free an IRQ from the IRQ domain
+ * @domain: Domain to which the irqs belong
+ * @virq: base linux virtual IRQ to be freed.
+ * @nr_irqs: Number of continuous irqs to be freed
+ */
+static void ti_sci_inta_irq_domain_free(struct irq_domain *domain,
+ unsigned int virq, unsigned int nr_irqs)
+{
+ struct ti_sci_inta_vint_desc *vint_desc;
+ struct irq_data *data;
+
+ data = irq_domain_get_irq_data(domain, virq);
+ vint_desc = irq_data_get_irq_chip_data(data);
+
+ ti_sci_free_event_irq(domain, vint_desc, data->hwirq);
+ ti_sci_inta_free_vint(domain->host_data, vint_desc);
+ irq_domain_reset_irq_data(data);
+}
+
+/**
+ * ti_sci_allocate_event_irq() - Allocate an event to a IA vint.
+ *
+ * Return global_event if all went ok else appropriate error value.
+ */
+static
+int ti_sci_allocate_event_irq(struct irq_domain *domain, msi_alloc_info_t *arg)
+{
+ struct ti_sci_inta_irq_domain *inta = domain->host_data;
+ struct ti_sci_inta_event_desc *event_desc;
+ struct ti_sci_inta_vint_desc *vint_desc;
+ u16 free_bit, src_id, src_index;
+ int err;
+
+ src_id = HWIRQ_TO_DEVID(arg->hwirq);
+ src_index = HWIRQ_TO_IRQID(arg->hwirq);
+ vint_desc = arg->scratchpad[0].ptr;
+
+ mutex_lock(&vint_desc->event_lock);
+ free_bit = find_first_zero_bit(vint_desc->event_map,
+ MAX_EVENTS_PER_VINT);
+ if (free_bit != MAX_EVENTS_PER_VINT)
+ set_bit(free_bit, vint_desc->event_map);
+ mutex_unlock(&vint_desc->event_lock);
+
+ event_desc = &vint_desc->events[free_bit];
+
+ event_desc->src_id = src_id;
+ event_desc->src_index = src_index;
+ event_desc->global_event = ti_sci_get_free_resource(inta->global_event);
+ if (event_desc->global_event == TI_SCI_RESOURCE_NULL) {
+ err = -EINVAL;
+ goto free_event;
+ }
+
+ err = inta->sci->ops.rm_irq_ops.set_event_map(inta->sci,
+ src_id, src_index,
+ inta->ia_id,
+ vint_desc->vint_id,
+ event_desc->global_event,
+ free_bit);
+ if (err)
+ goto free_global_event;
+
+ return event_desc->global_event;
+free_global_event:
+ ti_sci_release_resource(inta->global_event, event_desc->global_event);
+free_event:
+ clear_bit(free_bit, vint_desc->event_map);
+ return err;
+}
+
+struct ti_sci_inta_vint_desc *
+ti_sci_inta_get_vint(struct ti_sci_inta_irq_domain *inta, u16 vint)
+{
+ struct ti_sci_inta_vint_desc *vint_desc;
+
+ list_for_each_entry(vint_desc, &inta->vint_list, list)
+ if (vint_desc->vint_id == vint)
+ return vint_desc;
+ return NULL;
+}
+
+/**
+ * ti_sci_inta_irq_domain_alloc() - Allocate Interrupt aggregator IRQs
+ * @domain: Point to the interrupt aggregator IRQ domain
+ * @virq: Corresponding Linux virtual IRQ number
+ * @nr_irqs: Continuous irqs to be allocated
+ * @data: Pointer to firmware specifier
+ *
+ * Return 0 if all went well else appropriate error value.
+ */
+static int ti_sci_inta_irq_domain_alloc(struct irq_domain *domain,
+ unsigned int virq, unsigned int nr_irqs,
+ void *data)
+{
+ struct ti_sci_inta_irq_domain *inta = domain->host_data;
+ msi_alloc_info_t *arg = data;
+ int hwirq;
+ u16 vint;
+
+ if (arg->desc->inta.share) {
+ if (!arg->scratchpad[0].ptr) {
+ vint = ti_sci_get_free_resource(inta->vint);
+ arg->scratchpad[0].ptr = ti_sci_inta_get_vint(inta,
+ vint);
+ }
+ } else {
+ vint = ti_sci_get_free_resource(inta->vint);
+ arg->scratchpad[0].ptr = ti_sci_inta_get_vint(inta, vint);
+ }
+
+ hwirq = ti_sci_allocate_event_irq(domain, arg);
+ if (hwirq < 0)
+ return hwirq;
+
+ irq_domain_set_info(domain, virq, hwirq, &ti_sci_inta_irq_chip,
+ arg->scratchpad[0].ptr, handle_simple_irq,
+ NULL, NULL);
+
+ return 0;
+}
+
+static const struct irq_domain_ops ti_sci_inta_irq_domain_ops = {
+ .alloc = ti_sci_inta_irq_domain_alloc,
+ .free = ti_sci_inta_irq_domain_free,
+};
+
+static struct irq_chip inta_msi_irq_chip = {
+ .name = "MSI-INTA",
+};
+
+static void inta_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
+{
+ arg->desc = desc;
+ arg->hwirq = TO_HWIRQ(desc->inta.dev_id, desc->inta.index);
+}
+
+static struct msi_domain_ops inta_msi_ops = {
+ .set_desc = inta_msi_set_desc,
+};
+
+static struct msi_domain_info inta_msi_domain_info = {
+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
+ .ops = &inta_msi_ops,
+ .chip = &inta_msi_irq_chip,
+};
+
+static void inta_msi_irq_handler(struct irq_desc *desc)
+{
+ struct ti_sci_inta_vint_desc *vint_desc;
+ struct ti_sci_inta_irq_domain *inta;
+ struct irq_domain *domain;
+ struct irq_data *irq_data;
+ u32 hwirq, bit, virq;
+ u64 val;
+
+ vint_desc = irq_desc_get_handler_data(desc);
+ domain = vint_desc->domain;
+ inta = domain->host_data;
+
+ chained_irq_enter(irq_desc_get_chip(desc), desc);
+
+ val = readq_relaxed(inta->base + vint_desc->vint_id * 0x1000 +
+ VINT_STATUS_OFFSET);
+
+ for (bit = 0; bit < MAX_EVENTS_PER_VINT; bit++) {
+ if (BIT(bit) & val) {
+ hwirq = vint_desc->events[bit].global_event;
+ virq = irq_find_mapping(domain, hwirq);
+ irq_data = irq_get_irq_data(virq);
+ if (irqd_get_trigger_type(irq_data) ==
+ IRQF_TRIGGER_HIGH)
+ writeq_relaxed(BIT(bit),
+ inta->base + vint_desc->vint_id *
+ 0x1000 + VINT_STATUS_OFFSET);
+
+ if (virq)
+ generic_handle_irq(virq);
+ }
+ }
+
+ chained_irq_exit(irq_desc_get_chip(desc), desc);
+}
+
+/**
+ * ti_sci_inta_alloc_parent_irq() - Allocate parent irq to Interrupt aggregator
+ * @domain: IRQ domain corresponding to Interrupt Aggregator
+ * @virq: Linux virtual IRQ number
+ *
+ * Return 0 if all went well else corresponding error value.
+ */
+static int ti_sci_inta_alloc_parent_irq(struct irq_domain *domain, u16 vint_id)
+{
+ struct ti_sci_inta_irq_domain *inta = domain->host_data;
+ struct ti_sci_inta_vint_desc *vint_desc;
+ struct irq_fwspec parent_fwspec;
+ unsigned int virq;
+
+ vint_desc = kzalloc(sizeof(*vint_desc), GFP_KERNEL);
+ if (!vint_desc)
+ return -ENOMEM;
+
+ vint_desc->event_map = kcalloc(BITS_TO_LONGS(MAX_EVENTS_PER_VINT),
+ sizeof(*vint_desc->event_map),
+ GFP_KERNEL);
+ if (!vint_desc->event_map) {
+ kfree(vint_desc);
+ return -ENOMEM;
+ }
+
+ vint_desc->domain = domain;
+ vint_desc->vint_id = vint_id;
+ INIT_LIST_HEAD(&vint_desc->list);
+ list_add_tail(&vint_desc->list, &inta->vint_list);
+
+ parent_fwspec.fwnode = domain->parent->fwnode;
+ parent_fwspec.param_count = 4;
+ /* Interrupt parent is Interrupt Router */
+ parent_fwspec.param[0] = inta->ia_id;
+ parent_fwspec.param[1] = vint_desc->vint_id;
+ parent_fwspec.param[2] = IRQF_TRIGGER_HIGH;
+ parent_fwspec.param[3] = 1;
+
+ virq = irq_create_fwspec_mapping(&parent_fwspec);
+ if (virq <= 0) {
+ kfree(vint_desc->event_map);
+ kfree(vint_desc);
+ return -ERANGE;
+ }
+
+ irq_set_chained_handler_and_data(virq, inta_msi_irq_handler, vint_desc);
+
+ mutex_init(&vint_desc->event_lock);
+
+ return 0;
+}
+
+static int ti_sci_inta_irq_domain_probe(struct platform_device *pdev)
+{
+ struct irq_domain *parent_domain, *domain, *msi_domain;
+ struct device_node *parent_node, *node;
+ struct ti_sci_inta_irq_domain *inta;
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ int ret, set, i;
+
+ node = dev_of_node(dev);
+ parent_node = of_irq_find_parent(node);
+ if (!parent_node) {
+ dev_err(dev, "Failed to get IRQ parent node\n");
+ return -ENODEV;
+ }
+
+ parent_domain = irq_find_host(parent_node);
+ if (!parent_domain)
+ return -EPROBE_DEFER;
+
+ inta = devm_kzalloc(dev, sizeof(*inta), GFP_KERNEL);
+ if (!inta)
+ return -ENOMEM;
+
+ inta->sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
+ if (IS_ERR(inta->sci)) {
+ ret = PTR_ERR(inta->sci);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "ti,sci read fail %d\n", ret);
+ inta->sci = NULL;
+ return ret;
+ }
+
+ ret = of_property_read_u32(dev->of_node, "ti,sci-dev-id",
+ (u32 *)&inta->ia_id);
+ if (ret) {
+ dev_err(dev, "missing 'ti,sci-dev-id' property\n");
+ return -EINVAL;
+ }
+
+ inta->vint = devm_ti_sci_get_of_resource(inta->sci, dev,
+ inta->ia_id,
+ "ti,sci-rm-range-vint");
+ if (IS_ERR(inta->vint)) {
+ dev_err(dev, "VINT resource allocation failed\n");
+ return PTR_ERR(inta->vint);
+ }
+
+ inta->global_event =
+ devm_ti_sci_get_of_resource(inta->sci, dev,
+ inta->ia_id,
+ "ti,sci-rm-range-global-event");
+ if (IS_ERR(inta->global_event)) {
+ dev_err(dev, "Global event resource allocation failed\n");
+ return PTR_ERR(inta->global_event);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ inta->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(inta->base))
+ return -ENODEV;
+
+ domain = irq_domain_add_hierarchy(parent_domain, 0, 0, dev_of_node(dev),
+ &ti_sci_inta_irq_domain_ops, inta);
+ if (!domain) {
+ dev_err(dev, "Failed to allocate IRQ domain\n");
+ return -ENOMEM;
+ }
+
+ msi_domain = inta_msi_create_irq_domain(of_node_to_fwnode(node),
+ &inta_msi_domain_info,
+ domain);
+ if (!msi_domain) {
+ irq_domain_remove(domain);
+ dev_err(dev, "Failed to allocate msi domain\n");
+ return -ENOMEM;
+ }
+
+ INIT_LIST_HEAD(&inta->vint_list);
+ for (set = 0; set < inta->vint->sets; set++) {
+ for (i = 0; i < inta->vint->desc[set].num; i++) {
+ if (ti_sci_inta_alloc_parent_irq(domain,
+ inta->vint->desc[set].start + i))
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static const struct of_device_id ti_sci_inta_irq_domain_of_match[] = {
+ { .compatible = "ti,sci-inta", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ti_sci_inta_irq_domain_of_match);
+
+static struct platform_driver ti_sci_inta_irq_domain_driver = {
+ .probe = ti_sci_inta_irq_domain_probe,
+ .driver = {
+ .name = "ti-sci-inta",
+ .of_match_table = ti_sci_inta_irq_domain_of_match,
+ },
+};
+module_platform_driver(ti_sci_inta_irq_domain_driver);
+
+MODULE_AUTHOR("Lokesh Vutla <lokeshvutla@ticom>");
+MODULE_DESCRIPTION("K3 Interrupt Aggregator driver over TI SCI protocol");
+MODULE_LICENSE("GPL v2");
--
2.19.2
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