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305 lines
8.3 KiB
305 lines
8.3 KiB
// 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 - https://www.ti.com/ |
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* Lokesh Vutla <[email protected]> |
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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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/** |
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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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* @out_irqs: TISCI resource pointer representing INTR irqs. |
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* @dev: Struct device pointer. |
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* @ti_sci_id: TI-SCI device identifier |
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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 *out_irqs; |
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struct device *dev; |
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u32 ti_sci_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 != 1) |
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return -EINVAL; |
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*hwirq = fwspec->param[0]; |
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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_xlate_irq() - Translate hwirq to parent's hwirq. |
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* @intr: IRQ domain corresponding to Interrupt Router |
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* @irq: Hardware irq corresponding to the above irq domain |
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* |
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* Return parent irq number if translation is available else -ENOENT. |
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*/ |
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static int ti_sci_intr_xlate_irq(struct ti_sci_intr_irq_domain *intr, u32 irq) |
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{ |
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struct device_node *np = dev_of_node(intr->dev); |
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u32 base, pbase, size, len; |
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const __be32 *range; |
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range = of_get_property(np, "ti,interrupt-ranges", &len); |
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if (!range) |
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return irq; |
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for (len /= sizeof(*range); len >= 3; len -= 3) { |
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base = be32_to_cpu(*range++); |
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pbase = be32_to_cpu(*range++); |
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size = be32_to_cpu(*range++); |
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if (base <= irq && irq < base + size) |
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return irq - base + pbase; |
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} |
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return -ENOENT; |
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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; |
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int out_irq; |
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data = irq_domain_get_irq_data(domain, virq); |
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out_irq = (uintptr_t)data->chip_data; |
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intr->sci->ops.rm_irq_ops.free_irq(intr->sci, |
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intr->ti_sci_id, data->hwirq, |
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intr->ti_sci_id, out_irq); |
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ti_sci_release_resource(intr->out_irqs, out_irq); |
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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_parent_irq() - Allocate parent 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 intr output irq if all went well else appropriate error pointer. |
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*/ |
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static int ti_sci_intr_alloc_parent_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 device_node *parent_node; |
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struct irq_fwspec fwspec; |
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int p_hwirq, err = 0; |
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u16 out_irq; |
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out_irq = ti_sci_get_free_resource(intr->out_irqs); |
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if (out_irq == TI_SCI_RESOURCE_NULL) |
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return -EINVAL; |
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p_hwirq = ti_sci_intr_xlate_irq(intr, out_irq); |
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if (p_hwirq < 0) |
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goto err_irqs; |
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parent_node = of_irq_find_parent(dev_of_node(intr->dev)); |
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fwspec.fwnode = of_node_to_fwnode(parent_node); |
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if (of_device_is_compatible(parent_node, "arm,gic-v3")) { |
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/* Parent is GIC */ |
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fwspec.param_count = 3; |
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fwspec.param[0] = 0; /* SPI */ |
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fwspec.param[1] = p_hwirq - 32; /* SPI offset */ |
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fwspec.param[2] = intr->type; |
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} else { |
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/* Parent is Interrupt Router */ |
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fwspec.param_count = 1; |
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fwspec.param[0] = p_hwirq; |
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} |
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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, |
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intr->ti_sci_id, hwirq, |
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intr->ti_sci_id, out_irq); |
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if (err) |
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goto err_msg; |
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return out_irq; |
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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->out_irqs, out_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, out_irq; |
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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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out_irq = ti_sci_intr_alloc_parent_irq(domain, virq, hwirq); |
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if (out_irq < 0) |
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return out_irq; |
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irq_domain_set_hwirq_and_chip(domain, virq, hwirq, |
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&ti_sci_intr_irq_chip, |
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(void *)(uintptr_t)out_irq); |
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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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intr->dev = dev; |
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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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return dev_err_probe(dev, PTR_ERR(intr->sci), |
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"ti,sci read fail\n"); |
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ret = of_property_read_u32(dev_of_node(dev), "ti,sci-dev-id", |
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&intr->ti_sci_id); |
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if (ret) { |
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dev_err(dev, "missing 'ti,sci-dev-id' property\n"); |
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return -EINVAL; |
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} |
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intr->out_irqs = devm_ti_sci_get_resource(intr->sci, dev, |
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intr->ti_sci_id, |
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TI_SCI_RESASG_SUBTYPE_IR_OUTPUT); |
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if (IS_ERR(intr->out_irqs)) { |
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dev_err(dev, "Destination irq resource allocation failed\n"); |
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return PTR_ERR(intr->out_irqs); |
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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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dev_info(dev, "Interrupt Router %d domain created\n", intr->ti_sci_id); |
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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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