arch/arm/mach-prima2/irq.c

   1 /*
   2  * interrupt controller support for CSR SiRFprimaII
   3  *
   4  * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
   5  *
   6  * Licensed under GPLv2 or later.
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/io.h>
  11 #include <linux/irq.h>
  12 #include <mach/hardware.h>
  13 #include <asm/mach/irq.h>
  14 #include <linux/of.h>
  15 #include <linux/of_address.h>
  16 #include <linux/irqdomain.h>
  17 #include <linux/syscore_ops.h>
  18
  19 #define SIRFSOC_INT_RISC_MASK0          0x0018
  20 #define SIRFSOC_INT_RISC_MASK1          0x001C
  21 #define SIRFSOC_INT_RISC_LEVEL0         0x0020
  22 #define SIRFSOC_INT_RISC_LEVEL1         0x0024
  23
  24 void __iomem *sirfsoc_intc_base;
  25
  26 static __init void
  27 sirfsoc_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
  28 {
  29         struct irq_chip_generic *gc;
  30         struct irq_chip_type *ct;
  31
  32         gc = irq_alloc_generic_chip("SIRFINTC", 1, irq_start, base, handle_level_irq);
  33         ct = gc->chip_types;
  34
  35         ct->chip.irq_mask = irq_gc_mask_clr_bit;
  36         ct->chip.irq_unmask = irq_gc_mask_set_bit;
  37         ct->regs.mask = SIRFSOC_INT_RISC_MASK0;
  38
  39         irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, IRQ_NOREQUEST, 0);
  40 }
  41
  42 static __init void sirfsoc_irq_init(void)
  43 {
  44         sirfsoc_alloc_gc(sirfsoc_intc_base, 0, 32);
  45         sirfsoc_alloc_gc(sirfsoc_intc_base + 4, 32, SIRFSOC_INTENAL_IRQ_END - 32);
  46
  47         writel_relaxed(0, sirfsoc_intc_base + SIRFSOC_INT_RISC_LEVEL0);
  48         writel_relaxed(0, sirfsoc_intc_base + SIRFSOC_INT_RISC_LEVEL1);
  49
  50         writel_relaxed(0, sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK0);
  51         writel_relaxed(0, sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK1);
  52 }
  53
  54 static struct of_device_id intc_ids[]  = {
  55         { .compatible = "sirf,prima2-intc" },
  56         {},
  57 };
  58
  59 void __init sirfsoc_of_irq_init(void)
  60 {
  61         struct device_node *np;
  62
  63         np = of_find_matching_node(NULL, intc_ids);
  64         if (!np)
  65                 panic("unable to find compatible intc node in dtb\n");
  66
  67         sirfsoc_intc_base = of_iomap(np, 0);
  68         if (!sirfsoc_intc_base)
  69                 panic("unable to map intc cpu registers\n");
  70
  71         irq_domain_add_simple(np, 0);
  72
  73         of_node_put(np);
  74
  75         sirfsoc_irq_init();
  76 }
  77
  78 struct sirfsoc_irq_status {
  79         u32 mask0;
  80         u32 mask1;
  81         u32 level0;
  82         u32 level1;
  83 };
  84
  85 static struct sirfsoc_irq_status sirfsoc_irq_st;
  86
  87 static int sirfsoc_irq_suspend(void)
  88 {
  89         sirfsoc_irq_st.mask0 = readl_relaxed(sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK0);
  90         sirfsoc_irq_st.mask1 = readl_relaxed(sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK1);
  91         sirfsoc_irq_st.level0 = readl_relaxed(sirfsoc_intc_base + SIRFSOC_INT_RISC_LEVEL0);
  92         sirfsoc_irq_st.level1 = readl_relaxed(sirfsoc_intc_base + SIRFSOC_INT_RISC_LEVEL1);
  93
  94         return 0;
  95 }
  96
  97 static void sirfsoc_irq_resume(void)
  98 {
  99         writel_relaxed(sirfsoc_irq_st.mask0, sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK0);
 100         writel_relaxed(sirfsoc_irq_st.mask1, sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK1);
 101         writel_relaxed(sirfsoc_irq_st.level0, sirfsoc_intc_base + SIRFSOC_INT_RISC_LEVEL0);
 102         writel_relaxed(sirfsoc_irq_st.level1, sirfsoc_intc_base + SIRFSOC_INT_RISC_LEVEL1);
 103 }
 104
 105 static struct syscore_ops sirfsoc_irq_syscore_ops = {
 106         .suspend        = sirfsoc_irq_suspend,
 107         .resume         = sirfsoc_irq_resume,
 108 };
 109
 110 static int __init sirfsoc_irq_pm_init(void)
 111 {
 112         register_syscore_ops(&sirfsoc_irq_syscore_ops);
 113         return 0;
 114 }
 115 device_initcall(sirfsoc_irq_pm_init);