diff options
Diffstat (limited to 'drivers/irqchip/irq-ti-sci-intr.c')
| -rw-r--r-- | drivers/irqchip/irq-ti-sci-intr.c | 305 |
1 files changed, 305 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 0000000000..c027cd9e4a --- /dev/null +++ b/drivers/irqchip/irq-ti-sci-intr.c @@ -0,0 +1,305 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Texas Instruments' K3 Interrupt Router irqchip driver + * + * Copyright (C) 2018-2019 Texas Instruments Incorporated - https://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.h> +#include <linux/of_irq.h> +#include <linux/platform_device.h> +#include <linux/soc/ti/ti_sci_protocol.h> + +/** + * struct ti_sci_intr_irq_domain - Structure representing a TISCI based + * Interrupt Router IRQ domain. + * @sci: Pointer to TISCI handle + * @out_irqs: TISCI resource pointer representing INTR irqs. + * @dev: Struct device pointer. + * @ti_sci_id: TI-SCI device identifier + * @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 *out_irqs; + struct device *dev; + u32 ti_sci_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 != 1) + return -EINVAL; + + *hwirq = fwspec->param[0]; + *type = intr->type; + + return 0; +} + +/** + * ti_sci_intr_xlate_irq() - Translate hwirq to parent's hwirq. + * @intr: IRQ domain corresponding to Interrupt Router + * @irq: Hardware irq corresponding to the above irq domain + * + * Return parent irq number if translation is available else -ENOENT. + */ +static int ti_sci_intr_xlate_irq(struct ti_sci_intr_irq_domain *intr, u32 irq) +{ + struct device_node *np = dev_of_node(intr->dev); + u32 base, pbase, size, len; + const __be32 *range; + + range = of_get_property(np, "ti,interrupt-ranges", &len); + if (!range) + return irq; + + for (len /= sizeof(*range); len >= 3; len -= 3) { + base = be32_to_cpu(*range++); + pbase = be32_to_cpu(*range++); + size = be32_to_cpu(*range++); + + if (base <= irq && irq < base + size) + return irq - base + pbase; + } + + return -ENOENT; +} + +/** + * 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; + int out_irq; + + data = irq_domain_get_irq_data(domain, virq); + out_irq = (uintptr_t)data->chip_data; + + intr->sci->ops.rm_irq_ops.free_irq(intr->sci, + intr->ti_sci_id, data->hwirq, + intr->ti_sci_id, out_irq); + ti_sci_release_resource(intr->out_irqs, out_irq); + irq_domain_free_irqs_parent(domain, virq, 1); + irq_domain_reset_irq_data(data); +} + +/** + * ti_sci_intr_alloc_parent_irq() - Allocate parent 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 intr output irq if all went well else appropriate error pointer. + */ +static int ti_sci_intr_alloc_parent_irq(struct irq_domain *domain, + unsigned int virq, u32 hwirq) +{ + struct ti_sci_intr_irq_domain *intr = domain->host_data; + struct device_node *parent_node; + struct irq_fwspec fwspec; + int p_hwirq, err = 0; + u16 out_irq; + + out_irq = ti_sci_get_free_resource(intr->out_irqs); + if (out_irq == TI_SCI_RESOURCE_NULL) + return -EINVAL; + + p_hwirq = ti_sci_intr_xlate_irq(intr, out_irq); + if (p_hwirq < 0) + goto err_irqs; + + parent_node = of_irq_find_parent(dev_of_node(intr->dev)); + fwspec.fwnode = of_node_to_fwnode(parent_node); + + if (of_device_is_compatible(parent_node, "arm,gic-v3")) { + /* Parent is GIC */ + fwspec.param_count = 3; + fwspec.param[0] = 0; /* SPI */ + fwspec.param[1] = p_hwirq - 32; /* SPI offset */ + fwspec.param[2] = intr->type; + } else { + /* Parent is Interrupt Router */ + fwspec.param_count = 1; + fwspec.param[0] = p_hwirq; + } + + 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, + intr->ti_sci_id, hwirq, + intr->ti_sci_id, out_irq); + if (err) + goto err_msg; + + return out_irq; + +err_msg: + irq_domain_free_irqs_parent(domain, virq, 1); +err_irqs: + ti_sci_release_resource(intr->out_irqs, out_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, out_irq; + + err = ti_sci_intr_irq_domain_translate(domain, fwspec, &hwirq, &flags); + if (err) + return err; + + out_irq = ti_sci_intr_alloc_parent_irq(domain, virq, hwirq); + if (out_irq < 0) + return out_irq; + + irq_domain_set_hwirq_and_chip(domain, virq, hwirq, + &ti_sci_intr_irq_chip, + (void *)(uintptr_t)out_irq); + + 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); + of_node_put(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; + + intr->dev = dev; + 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)) + return dev_err_probe(dev, PTR_ERR(intr->sci), + "ti,sci read fail\n"); + + ret = of_property_read_u32(dev_of_node(dev), "ti,sci-dev-id", + &intr->ti_sci_id); + if (ret) { + dev_err(dev, "missing 'ti,sci-dev-id' property\n"); + return -EINVAL; + } + + intr->out_irqs = devm_ti_sci_get_resource(intr->sci, dev, + intr->ti_sci_id, + TI_SCI_RESASG_SUBTYPE_IR_OUTPUT); + if (IS_ERR(intr->out_irqs)) { + dev_err(dev, "Destination irq resource allocation failed\n"); + return PTR_ERR(intr->out_irqs); + } + + 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; + } + + dev_info(dev, "Interrupt Router %d domain created\n", intr->ti_sci_id); + + 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"); |