linux/arch/sh/boards/mach-se/7722/irq.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Hitachi UL SolutionEngine 7722 FPGA IRQ Support.
   4 *
   5 * Copyright (C) 2007  Nobuhiro Iwamatsu
   6 * Copyright (C) 2012  Paul Mundt
   7 */
   8#define DRV_NAME "SE7722-FPGA"
   9#define pr_fmt(fmt) DRV_NAME ": " fmt
  10
  11#include <linux/init.h>
  12#include <linux/irq.h>
  13#include <linux/interrupt.h>
  14#include <linux/irqdomain.h>
  15#include <linux/io.h>
  16#include <linux/err.h>
  17#include <linux/sizes.h>
  18#include <mach-se/mach/se7722.h>
  19
  20#define IRQ01_BASE_ADDR 0x11800000
  21#define IRQ01_MODE_REG  0
  22#define IRQ01_STS_REG   4
  23#define IRQ01_MASK_REG  8
  24
  25static void __iomem *se7722_irq_regs;
  26struct irq_domain *se7722_irq_domain;
  27
  28static void se7722_irq_demux(struct irq_desc *desc)
  29{
  30        struct irq_data *data = irq_desc_get_irq_data(desc);
  31        struct irq_chip *chip = irq_data_get_irq_chip(data);
  32        unsigned long mask;
  33        int bit;
  34
  35        chip->irq_mask_ack(data);
  36
  37        mask = ioread16(se7722_irq_regs + IRQ01_STS_REG);
  38
  39        for_each_set_bit(bit, &mask, SE7722_FPGA_IRQ_NR)
  40                generic_handle_irq(irq_linear_revmap(se7722_irq_domain, bit));
  41
  42        chip->irq_unmask(data);
  43}
  44
  45static void __init se7722_domain_init(void)
  46{
  47        int i;
  48
  49        se7722_irq_domain = irq_domain_add_linear(NULL, SE7722_FPGA_IRQ_NR,
  50                                                  &irq_domain_simple_ops, NULL);
  51        if (unlikely(!se7722_irq_domain)) {
  52                printk("Failed to get IRQ domain\n");
  53                return;
  54        }
  55
  56        for (i = 0; i < SE7722_FPGA_IRQ_NR; i++) {
  57                int irq = irq_create_mapping(se7722_irq_domain, i);
  58
  59                if (unlikely(irq == 0)) {
  60                        printk("Failed to allocate IRQ %d\n", i);
  61                        return;
  62                }
  63        }
  64}
  65
  66static void __init se7722_gc_init(void)
  67{
  68        struct irq_chip_generic *gc;
  69        struct irq_chip_type *ct;
  70        unsigned int irq_base;
  71
  72        irq_base = irq_linear_revmap(se7722_irq_domain, 0);
  73
  74        gc = irq_alloc_generic_chip(DRV_NAME, 1, irq_base, se7722_irq_regs,
  75                                    handle_level_irq);
  76        if (unlikely(!gc))
  77                return;
  78
  79        ct = gc->chip_types;
  80        ct->chip.irq_mask = irq_gc_mask_set_bit;
  81        ct->chip.irq_unmask = irq_gc_mask_clr_bit;
  82
  83        ct->regs.mask = IRQ01_MASK_REG;
  84
  85        irq_setup_generic_chip(gc, IRQ_MSK(SE7722_FPGA_IRQ_NR),
  86                               IRQ_GC_INIT_MASK_CACHE,
  87                               IRQ_NOREQUEST | IRQ_NOPROBE, 0);
  88
  89        irq_set_chained_handler(IRQ0_IRQ, se7722_irq_demux);
  90        irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
  91
  92        irq_set_chained_handler(IRQ1_IRQ, se7722_irq_demux);
  93        irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
  94}
  95
  96/*
  97 * Initialize FPGA IRQs
  98 */
  99void __init init_se7722_IRQ(void)
 100{
 101        se7722_irq_regs = ioremap(IRQ01_BASE_ADDR, SZ_16);
 102        if (unlikely(!se7722_irq_regs)) {
 103                printk("Failed to remap IRQ01 regs\n");
 104                return;
 105        }
 106
 107        /*
 108         * All FPGA IRQs disabled by default
 109         */
 110        iowrite16(0, se7722_irq_regs + IRQ01_MASK_REG);
 111
 112        __raw_writew(0x2000, 0xb03fffec);  /* mrshpc irq enable */
 113
 114        se7722_domain_init();
 115        se7722_gc_init();
 116}
 117