1 files changed, 275 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-ti-sci-intr.c b/drivers/irqchip/irq-ti-sci-intr.c
new file mode 100644
index 000000000000..59d51a20bbd8
--- /dev/null
+++ b/drivers/irqchip/irq-ti-sci-intr.c
@@ -0,0 +1,275 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Texas Instruments' K3 Interrupt Router irqchip driver
+ *
+ * Copyright (C) 2018-2019 Texas Instruments Incorporated - http://www.ti.com/
+ *      Lokesh Vutla <lokeshvutla@ti.com>
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/io.h>
+#include <linux/irqchip.h>
+#include <linux/irqdomain.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/soc/ti/ti_sci_protocol.h>
+
+#define TI_SCI_DEV_ID_MASK      0xffff
+#define TI_SCI_DEV_ID_SHIFT     16
+#define TI_SCI_IRQ_ID_MASK      0xffff
+#define TI_SCI_IRQ_ID_SHIFT     0
+#define HWIRQ_TO_DEVID(hwirq)   (((hwirq) >> (TI_SCI_DEV_ID_SHIFT)) & \
+                                 (TI_SCI_DEV_ID_MASK))
+#define HWIRQ_TO_IRQID(hwirq)   ((hwirq) & (TI_SCI_IRQ_ID_MASK))
+#define TO_HWIRQ(dev, index)    ((((dev) & TI_SCI_DEV_ID_MASK) << \
+                                 TI_SCI_DEV_ID_SHIFT) | \
+                                ((index) & TI_SCI_IRQ_ID_MASK))
+
+/**
+ * struct ti_sci_intr_irq_domain - Structure representing a TISCI based
+ *                                 Interrupt Router IRQ domain.
+ * @sci:        Pointer to TISCI handle
+ * @dst_irq:    TISCI resource pointer representing GIC irq controller.
+ * @dst_id:     TISCI device ID of the GIC irq controller.
+ * @type:       Specifies the trigger type supported by this Interrupt Router
+ */
+struct ti_sci_intr_irq_domain {
+        const struct ti_sci_handle *sci;
+        struct ti_sci_resource *dst_irq;
+        u32 dst_id;
+        u32 type;
+};
+
+static struct irq_chip ti_sci_intr_irq_chip = {
+        .name                   = "INTR",
+        .irq_eoi                = irq_chip_eoi_parent,
+        .irq_mask               = irq_chip_mask_parent,
+        .irq_unmask             = irq_chip_unmask_parent,
+        .irq_set_type           = irq_chip_set_type_parent,
+        .irq_retrigger          = irq_chip_retrigger_hierarchy,
+        .irq_set_affinity       = irq_chip_set_affinity_parent,
+};
+
+/**
+ * ti_sci_intr_irq_domain_translate() - Retrieve hwirq and type from
+ *                                      IRQ firmware specific handler.
+ * @domain:     Pointer to IRQ domain
+ * @fwspec:     Pointer to IRQ specific firmware structure
+ * @hwirq:      IRQ number identified by hardware
+ * @type:       IRQ type
+ *
+ * Return 0 if all went ok else appropriate error.
+ */
+static int ti_sci_intr_irq_domain_translate(struct irq_domain *domain,
+                                            struct irq_fwspec *fwspec,
+                                            unsigned long *hwirq,
+                                            unsigned int *type)
+{
+        struct ti_sci_intr_irq_domain *intr = domain->host_data;
+
+        if (fwspec->param_count != 2)
+                return -EINVAL;
+
+        *hwirq = TO_HWIRQ(fwspec->param[0], fwspec->param[1]);
+        *type = intr->type;
+
+        return 0;
+}
+
+/**
+ * ti_sci_intr_irq_domain_free() - Free the specified IRQs from the domain.
+ * @domain:     Domain to which the irqs belong
+ * @virq:       Linux virtual IRQ to be freed.
+ * @nr_irqs:    Number of continuous irqs to be freed
+ */
+static void ti_sci_intr_irq_domain_free(struct irq_domain *domain,
+                                        unsigned int virq, unsigned int nr_irqs)
+{
+        struct ti_sci_intr_irq_domain *intr = domain->host_data;
+        struct irq_data *data, *parent_data;
+        u16 dev_id, irq_index;
+
+        parent_data = irq_domain_get_irq_data(domain->parent, virq);
+        data = irq_domain_get_irq_data(domain, virq);
+        irq_index = HWIRQ_TO_IRQID(data->hwirq);
+        dev_id = HWIRQ_TO_DEVID(data->hwirq);
+
+        intr->sci->ops.rm_irq_ops.free_irq(intr->sci, dev_id, irq_index,
+                                           intr->dst_id, parent_data->hwirq);
+        ti_sci_release_resource(intr->dst_irq, parent_data->hwirq);
+        irq_domain_free_irqs_parent(domain, virq, 1);
+        irq_domain_reset_irq_data(data);
+}
+
+/**
+ * ti_sci_intr_alloc_gic_irq() - Allocate GIC specific IRQ
+ * @domain:     Pointer to the interrupt router IRQ domain
+ * @virq:       Corresponding Linux virtual IRQ number
+ * @hwirq:      Corresponding hwirq for the IRQ within this IRQ domain
+ *
+ * Returns 0 if all went well else appropriate error pointer.
+ */
+static int ti_sci_intr_alloc_gic_irq(struct irq_domain *domain,
+                                     unsigned int virq, u32 hwirq)
+{
+        struct ti_sci_intr_irq_domain *intr = domain->host_data;
+        struct irq_fwspec fwspec;
+        u16 dev_id, irq_index;
+        u16 dst_irq;
+        int err;
+
+        dev_id = HWIRQ_TO_DEVID(hwirq);
+        irq_index = HWIRQ_TO_IRQID(hwirq);
+
+        dst_irq = ti_sci_get_free_resource(intr->dst_irq);
+        if (dst_irq == TI_SCI_RESOURCE_NULL)
+                return -EINVAL;
+
+        fwspec.fwnode = domain->parent->fwnode;
+        fwspec.param_count = 3;
+        fwspec.param[0] = 0;    /* SPI */
+        fwspec.param[1] = dst_irq - 32; /* SPI offset */
+        fwspec.param[2] = intr->type;
+
+        err = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
+        if (err)
+                goto err_irqs;
+
+        err = intr->sci->ops.rm_irq_ops.set_irq(intr->sci, dev_id, irq_index,
+                                                intr->dst_id, dst_irq);
+        if (err)
+                goto err_msg;
+
+        return 0;
+
+err_msg:
+        irq_domain_free_irqs_parent(domain, virq, 1);
+err_irqs:
+        ti_sci_release_resource(intr->dst_irq, dst_irq);
+        return err;
+}
+
+/**
+ * ti_sci_intr_irq_domain_alloc() - Allocate Interrupt router IRQs
+ * @domain:     Point to the interrupt router 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_intr_irq_domain_alloc(struct irq_domain *domain,
+                                        unsigned int virq, unsigned int nr_irqs,
+                                        void *data)
+{
+        struct irq_fwspec *fwspec = data;
+        unsigned long hwirq;
+        unsigned int flags;
+        int err;
+
+        err = ti_sci_intr_irq_domain_translate(domain, fwspec, &hwirq, &flags);
+        if (err)
+                return err;
+
+        err = ti_sci_intr_alloc_gic_irq(domain, virq, hwirq);
+        if (err)
+                return err;
+
+        irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
+                                      &ti_sci_intr_irq_chip, NULL);
+
+        return 0;
+}
+
+static const struct irq_domain_ops ti_sci_intr_irq_domain_ops = {
+        .free           = ti_sci_intr_irq_domain_free,
+        .alloc          = ti_sci_intr_irq_domain_alloc,
+        .translate      = ti_sci_intr_irq_domain_translate,
+};
+
+static int ti_sci_intr_irq_domain_probe(struct platform_device *pdev)
+{
+        struct irq_domain *parent_domain, *domain;
+        struct ti_sci_intr_irq_domain *intr;
+        struct device_node *parent_node;
+        struct device *dev = &pdev->dev;
+        int ret;
+
+        parent_node = of_irq_find_parent(dev_of_node(dev));
+        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) {
+                dev_err(dev, "Failed to find IRQ parent domain\n");
+                return -ENODEV;
+        }
+
+        intr = devm_kzalloc(dev, sizeof(*intr), GFP_KERNEL);
+        if (!intr)
+                return -ENOMEM;
+
+        ret = of_property_read_u32(dev_of_node(dev), "ti,intr-trigger-type",
+                                   &intr->type);
+        if (ret) {
+                dev_err(dev, "missing ti,intr-trigger-type property\n");
+                return -EINVAL;
+        }
+
+        intr->sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
+        if (IS_ERR(intr->sci)) {
+                ret = PTR_ERR(intr->sci);
+                if (ret != -EPROBE_DEFER)
+                        dev_err(dev, "ti,sci read fail %d\n", ret);
+                intr->sci = NULL;
+                return ret;
+        }
+
+        ret = of_property_read_u32(dev_of_node(dev), "ti,sci-dst-id",
+                                   &intr->dst_id);
+        if (ret) {
+                dev_err(dev, "missing 'ti,sci-dst-id' property\n");
+                return -EINVAL;
+        }
+
+        intr->dst_irq = devm_ti_sci_get_of_resource(intr->sci, dev,
+                                                    intr->dst_id,
+                                                    "ti,sci-rm-range-girq");
+        if (IS_ERR(intr->dst_irq)) {
+                dev_err(dev, "Destination irq resource allocation failed\n");
+                return PTR_ERR(intr->dst_irq);
+        }
+
+        domain = irq_domain_add_hierarchy(parent_domain, 0, 0, dev_of_node(dev),
+                                          &ti_sci_intr_irq_domain_ops, intr);
+        if (!domain) {
+                dev_err(dev, "Failed to allocate IRQ domain\n");
+                return -ENOMEM;
+        }
+
+        return 0;
+}
+
+static const struct of_device_id ti_sci_intr_irq_domain_of_match[] = {
+        { .compatible = "ti,sci-intr", },
+        { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ti_sci_intr_irq_domain_of_match);
+
+static struct platform_driver ti_sci_intr_irq_domain_driver = {
+        .probe = ti_sci_intr_irq_domain_probe,
+        .driver = {
+                .name = "ti-sci-intr",
+                .of_match_table = ti_sci_intr_irq_domain_of_match,
+        },
+};
+module_platform_driver(ti_sci_intr_irq_domain_driver);
+
+MODULE_AUTHOR("Lokesh Vutla <lokeshvutla@ticom>");
+MODULE_DESCRIPTION("K3 Interrupt Router driver over TI SCI protocol");
+MODULE_LICENSE("GPL v2");