127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* RZ/N1 GPIO Interrupt Multiplexer
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*
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* Copyright 2025 Schneider Electric
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* Author: Herve Codina <herve.codina@bootlin.com>
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*/
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#include <linux/bitmap.h>
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#include <linux/bitops.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/platform_device.h>
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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/*
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* Up to 8 output lines are connected to GIC SPI interrupt controller
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* starting at IRQ 103.
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*/
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#define RZN1_IRQMUX_GIC_SPI_BASE 103
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#define RZN1_IRQMUX_NUM_OUTPUTS 8
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static int rzn1_irqmux_parent_args_to_line_index(struct device *dev,
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const struct of_phandle_args *parent_args)
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{
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/*
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* The parent interrupt should be one of the GIC controller.
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* Three arguments must be provided.
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* - args[0]: GIC_SPI
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* - args[1]: The GIC interrupt number
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* - args[2]: The interrupt flags
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*
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* We retrieve the line index based on the GIC interrupt number
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* provided.
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*/
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if (parent_args->args_count != 3 || parent_args->args[0] != GIC_SPI) {
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dev_err(dev, "Invalid interrupt-map item\n");
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return -EINVAL;
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}
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if (parent_args->args[1] < RZN1_IRQMUX_GIC_SPI_BASE ||
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parent_args->args[1] >= RZN1_IRQMUX_GIC_SPI_BASE + RZN1_IRQMUX_NUM_OUTPUTS) {
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dev_err(dev, "Invalid GIC interrupt %u\n", parent_args->args[1]);
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return -EINVAL;
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}
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return parent_args->args[1] - RZN1_IRQMUX_GIC_SPI_BASE;
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}
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static int rzn1_irqmux_probe(struct platform_device *pdev)
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{
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DECLARE_BITMAP(index_done, RZN1_IRQMUX_NUM_OUTPUTS) = {};
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct of_imap_parser imap_parser;
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struct of_imap_item imap_item;
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u32 __iomem *regs;
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int index;
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int ret;
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u32 tmp;
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regs = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(regs))
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return PTR_ERR(regs);
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/* We support only #interrupt-cells = <1> and #address-cells = <0> */
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ret = of_property_read_u32(np, "#interrupt-cells", &tmp);
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if (ret)
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return ret;
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if (tmp != 1)
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return -EINVAL;
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ret = of_property_read_u32(np, "#address-cells", &tmp);
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if (ret)
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return ret;
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if (tmp != 0)
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return -EINVAL;
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ret = of_imap_parser_init(&imap_parser, np, &imap_item);
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if (ret)
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return ret;
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for_each_of_imap_item(&imap_parser, &imap_item) {
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index = rzn1_irqmux_parent_args_to_line_index(dev, &imap_item.parent_args);
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if (index < 0) {
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of_node_put(imap_item.parent_args.np);
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return index;
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}
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if (test_and_set_bit(index, index_done)) {
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of_node_put(imap_item.parent_args.np);
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dev_err(dev, "Mux output line %d already defined in interrupt-map\n",
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index);
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return -EINVAL;
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}
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/*
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* The child #address-cells is 0 (already checked). The first
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* value in imap item is the src hwirq.
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*/
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writel(imap_item.child_imap[0], regs + index);
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}
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return 0;
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}
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static const struct of_device_id rzn1_irqmux_of_match[] = {
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{ .compatible = "renesas,rzn1-gpioirqmux", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, rzn1_irqmux_of_match);
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static struct platform_driver rzn1_irqmux_driver = {
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.probe = rzn1_irqmux_probe,
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.driver = {
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.name = "rzn1_irqmux",
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.of_match_table = rzn1_irqmux_of_match,
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},
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};
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module_platform_driver(rzn1_irqmux_driver);
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MODULE_AUTHOR("Herve Codina <herve.codina@bootlin.com>");
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MODULE_DESCRIPTION("Renesas RZ/N1 GPIO IRQ Multiplexer Driver");
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MODULE_LICENSE("GPL");
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