LXR linux/drivers/irqchip/irqchip.c

   1/*
   2 * Copyright (C) 2012 Thomas Petazzoni
   3 *
   4 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   5 *
   6 * This file is licensed under the terms of the GNU General Public
   7 * License version 2.  This program is licensed "as is" without any
   8 * warranty of any kind, whether express or implied.
   9 */
  10
  11#include <linux/acpi.h>
  12#include <linux/init.h>
  13#include <linux/of_device.h>
  14#include <linux/of_irq.h>
  15#include <linux/irqchip.h>
  16#include <linux/platform_device.h>
  17
  18#ifdef CONFIG_IRQCHIP_XILINX_INTC_MODULE_SUPPORT_EXPERIMENTAL
  19struct platform_irqchip_instance {
  20        of_irq_init_cb_t irq_init_cb;
  21        of_irq_remove_cb_t irq_remove_cb;
  22        struct device_node *parent_node;
  23};
  24#endif
  25
  26/*
  27 * This special of_device_id is the sentinel at the end of the
  28 * of_device_id[] array of all irqchips. It is automatically placed at
  29 * the end of the array by the linker, thanks to being part of a
  30 * special section.
  31 */
  32static const struct of_device_id
  33irqchip_of_match_end __used __section("__irqchip_of_table_end");
  34
  35extern struct of_device_id __irqchip_of_table[];
  36
  37void __init irqchip_init(void)
  38{
  39        of_irq_init(__irqchip_of_table);
  40        acpi_probe_device_table(irqchip);
  41}
  42
  43#ifndef CONFIG_IRQCHIP_XILINX_INTC_MODULE_SUPPORT_EXPERIMENTAL
  44int platform_irqchip_probe(struct platform_device *pdev)
  45{
  46        struct device_node *np = pdev->dev.of_node;
  47        struct device_node *par_np = of_irq_find_parent(np);
  48        of_irq_init_cb_t irq_init_cb = of_device_get_match_data(&pdev->dev);
  49
  50        if (!irq_init_cb)
  51                return -EINVAL;
  52
  53        if (par_np == np)
  54                par_np = NULL;
  55
  56        /*
  57         * If there's a parent interrupt controller and  none of the parent irq
  58         * domains have been registered, that means the parent interrupt
  59         * controller has not been initialized yet.  it's not time for this
  60         * interrupt controller to initialize. So, defer probe of this
  61         * interrupt controller. The actual initialization callback of this
  62         * interrupt controller can check for specific domains as necessary.
  63         */
  64        if (par_np && !irq_find_matching_host(par_np, DOMAIN_BUS_ANY))
  65                return -EPROBE_DEFER;
  66
  67        return irq_init_cb(np, par_np);
  68}
  69EXPORT_SYMBOL_GPL(platform_irqchip_probe);
  70#else
  71int platform_irqchip_probe(struct platform_device *pdev)
  72{
  73        struct platform_irqchip_instance *irqchip;
  74        const struct irqc_init_remove_funps *irqchip_funps;
  75        struct device_node *np = pdev->dev.of_node;
  76        struct device_node *par_np = of_irq_find_parent(np);
  77
  78        irqchip = devm_kzalloc(&pdev->dev, sizeof(*irqchip), GFP_KERNEL);
  79        if (!irqchip)
  80                return -ENOMEM;
  81
  82        platform_set_drvdata(pdev, irqchip);
  83
  84        irqchip_funps = of_device_get_match_data(&pdev->dev);
  85        irqchip->irq_init_cb =  irqchip_funps->irqchip_initp;
  86        irqchip->irq_remove_cb = irqchip_funps->irqchip_removep;
  87        irqchip->parent_node = par_np;
  88
  89        if (!irqchip->irq_init_cb)
  90                return -EINVAL;
  91
  92        if (par_np == np)
  93                par_np = NULL;
  94
  95        /*
  96         * If there's a parent interrupt controller and  none of the parent irq
  97         * domains have been registered, that means the parent interrupt
  98         * controller has not been initialized yet.  it's not time for this
  99         * interrupt controller to initialize. So, defer probe of this
 100         * interrupt controller. The actual initialization callback of this
 101         * interrupt controller can check for specific domains as necessary.
 102         */
 103        if (par_np && !irq_find_matching_host(par_np, DOMAIN_BUS_ANY))
 104                return -EPROBE_DEFER;
 105
 106        return irqchip->irq_init_cb(np, par_np);
 107}
 108EXPORT_SYMBOL_GPL(platform_irqchip_probe);
 109
 110int platform_irqchip_remove(struct platform_device *pdev)
 111{
 112        struct device_node *np = pdev->dev.of_node;
 113        struct platform_irqchip_instance *irqchip = platform_get_drvdata(pdev);
 114        struct device_node *par_np = irqchip->parent_node;
 115
 116        if (!irqchip->irq_remove_cb)
 117                return -EINVAL;
 118
 119        if (par_np == np)
 120                par_np = NULL;
 121
 122        return irqchip->irq_remove_cb(np, par_np);
 123}
 124EXPORT_SYMBOL_GPL(platform_irqchip_remove);
 125#endif
 126