LXR linux/drivers/irqchip/irq-rda-intc.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * RDA8810PL SoC irqchip driver
   4 *
   5 * Copyright RDA Microelectronics Company Limited
   6 * Copyright (c) 2017 Andreas F\xC3\xA4rber
   7 * Copyright (c) 2018 Manivannan Sadhasivam
   8 */
   9
  10#include <linux/init.h>
  11#include <linux/interrupt.h>
  12#include <linux/irq.h>
  13#include <linux/irqchip.h>
  14#include <linux/irqdomain.h>
  15#include <linux/of_address.h>
  16
  17#include <asm/exception.h>
  18
  19#define RDA_INTC_FINALSTATUS    0x00
  20#define RDA_INTC_MASK_SET       0x08
  21#define RDA_INTC_MASK_CLR       0x0c
  22
  23#define RDA_IRQ_MASK_ALL        0xFFFFFFFF
  24
  25#define RDA_NR_IRQS 32
  26
  27static void __iomem *rda_intc_base;
  28static struct irq_domain *rda_irq_domain;
  29
  30static void rda_intc_mask_irq(struct irq_data *d)
  31{
  32        writel_relaxed(BIT(d->hwirq), rda_intc_base + RDA_INTC_MASK_CLR);
  33}
  34
  35static void rda_intc_unmask_irq(struct irq_data *d)
  36{
  37        writel_relaxed(BIT(d->hwirq), rda_intc_base + RDA_INTC_MASK_SET);
  38}
  39
  40static int rda_intc_set_type(struct irq_data *data, unsigned int flow_type)
  41{
  42        /* Hardware supports only level triggered interrupts */
  43        if ((flow_type & (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW)) == flow_type)
  44                return 0;
  45
  46        return -EINVAL;
  47}
  48
  49static void __exception_irq_entry rda_handle_irq(struct pt_regs *regs)
  50{
  51        u32 stat = readl_relaxed(rda_intc_base + RDA_INTC_FINALSTATUS);
  52        u32 hwirq;
  53
  54        while (stat) {
  55                hwirq = __fls(stat);
  56                handle_domain_irq(rda_irq_domain, hwirq, regs);
  57                stat &= ~BIT(hwirq);
  58        }
  59}
  60
  61static struct irq_chip rda_irq_chip = {
  62        .name           = "rda-intc",
  63        .irq_mask       = rda_intc_mask_irq,
  64        .irq_unmask     = rda_intc_unmask_irq,
  65        .irq_set_type   = rda_intc_set_type,
  66};
  67
  68static int rda_irq_map(struct irq_domain *d,
  69                       unsigned int virq, irq_hw_number_t hw)
  70{
  71        irq_set_status_flags(virq, IRQ_LEVEL);
  72        irq_set_chip_and_handler(virq, &rda_irq_chip, handle_level_irq);
  73        irq_set_chip_data(virq, d->host_data);
  74        irq_set_probe(virq);
  75
  76        return 0;
  77}
  78
  79static const struct irq_domain_ops rda_irq_domain_ops = {
  80        .map = rda_irq_map,
  81        .xlate = irq_domain_xlate_onecell,
  82};
  83
  84static int __init rda8810_intc_init(struct device_node *node,
  85                                    struct device_node *parent)
  86{
  87        rda_intc_base = of_io_request_and_map(node, 0, "rda-intc");
  88        if (IS_ERR(rda_intc_base))
  89                return PTR_ERR(rda_intc_base);
  90
  91        /* Mask all interrupt sources */
  92        writel_relaxed(RDA_IRQ_MASK_ALL, rda_intc_base + RDA_INTC_MASK_CLR);
  93
  94        rda_irq_domain = irq_domain_create_linear(&node->fwnode, RDA_NR_IRQS,
  95                                                  &rda_irq_domain_ops,
  96                                                  rda_intc_base);
  97        if (!rda_irq_domain) {
  98                iounmap(rda_intc_base);
  99                return -ENOMEM;
 100        }
 101
 102        set_handle_irq(rda_handle_irq);
 103
 104        return 0;
 105}
 106
 107IRQCHIP_DECLARE(rda_intc, "rda,8810pl-intc", rda8810_intc_init);
 108