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