drivers/irqchip/irq-sirfsoc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * interrupt controller support for CSR SiRFprimaII
   4  *
   5  * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/io.h>
  10 #include <linux/irq.h>
  11 #include <linux/of.h>
  12 #include <linux/of_address.h>
  13 #include <linux/irqchip.h>
  14 #include <linux/irqdomain.h>
  15 #include <linux/syscore_ops.h>
  16 #include <asm/mach/irq.h>
  17 #include <asm/exception.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 #define SIRFSOC_INIT_IRQ_ID             0x0038
  24 #define SIRFSOC_INT_BASE_OFFSET         0x0004
  25
  26 #define SIRFSOC_NUM_IRQS                64
  27 #define SIRFSOC_NUM_BANKS               (SIRFSOC_NUM_IRQS / 32)
  28
  29 static struct irq_domain *sirfsoc_irqdomain;
  30
  31 static void __iomem *sirfsoc_irq_get_regbase(void)
  32 {
  33         return (void __iomem __force *)sirfsoc_irqdomain->host_data;
  34 }
  35
  36 static __init void sirfsoc_alloc_gc(void __iomem *base)
  37 {
  38         unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
  39         unsigned int set = IRQ_LEVEL;
  40         struct irq_chip_generic *gc;
  41         struct irq_chip_type *ct;
  42         int i;
  43
  44         irq_alloc_domain_generic_chips(sirfsoc_irqdomain, 32, 1, "irq_sirfsoc",
  45                                        handle_level_irq, clr, set,
  46                                        IRQ_GC_INIT_MASK_CACHE);
  47
  48         for (i = 0; i < SIRFSOC_NUM_BANKS; i++) {
  49                 gc = irq_get_domain_generic_chip(sirfsoc_irqdomain, i * 32);
  50                 gc->reg_base = base + i * SIRFSOC_INT_BASE_OFFSET;
  51                 ct = gc->chip_types;
  52                 ct->chip.irq_mask = irq_gc_mask_clr_bit;
  53                 ct->chip.irq_unmask = irq_gc_mask_set_bit;
  54                 ct->regs.mask = SIRFSOC_INT_RISC_MASK0;
  55         }
  56 }
  57
  58 static void __exception_irq_entry sirfsoc_handle_irq(struct pt_regs *regs)
  59 {
  60         void __iomem *base = sirfsoc_irq_get_regbase();
  61         u32 irqstat;
  62
  63         irqstat = readl_relaxed(base + SIRFSOC_INIT_IRQ_ID);
  64         handle_domain_irq(sirfsoc_irqdomain, irqstat & 0xff, regs);
  65 }
  66
  67 static int __init sirfsoc_irq_init(struct device_node *np,
  68         struct device_node *parent)
  69 {
  70         void __iomem *base = of_iomap(np, 0);
  71         if (!base)
  72                 panic("unable to map intc cpu registers\n");
  73
  74         sirfsoc_irqdomain = irq_domain_add_linear(np, SIRFSOC_NUM_IRQS,
  75                                                   &irq_generic_chip_ops, base);
  76         sirfsoc_alloc_gc(base);
  77
  78         writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL0);
  79         writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL1);
  80
  81         writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK0);
  82         writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK1);
  83
  84         set_handle_irq(sirfsoc_handle_irq);
  85
  86         return 0;
  87 }
  88 IRQCHIP_DECLARE(sirfsoc_intc, "sirf,prima2-intc", sirfsoc_irq_init);
  89
  90 struct sirfsoc_irq_status {
  91         u32 mask0;
  92         u32 mask1;
  93         u32 level0;
  94         u32 level1;
  95 };
  96
  97 static struct sirfsoc_irq_status sirfsoc_irq_st;
  98
  99 static int sirfsoc_irq_suspend(void)
 100 {
 101         void __iomem *base = sirfsoc_irq_get_regbase();
 102
 103         sirfsoc_irq_st.mask0 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK0);
 104         sirfsoc_irq_st.mask1 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK1);
 105         sirfsoc_irq_st.level0 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL0);
 106         sirfsoc_irq_st.level1 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL1);
 107
 108         return 0;
 109 }
 110
 111 static void sirfsoc_irq_resume(void)
 112 {
 113         void __iomem *base = sirfsoc_irq_get_regbase();
 114
 115         writel_relaxed(sirfsoc_irq_st.mask0, base + SIRFSOC_INT_RISC_MASK0);
 116         writel_relaxed(sirfsoc_irq_st.mask1, base + SIRFSOC_INT_RISC_MASK1);
 117         writel_relaxed(sirfsoc_irq_st.level0, base + SIRFSOC_INT_RISC_LEVEL0);
 118         writel_relaxed(sirfsoc_irq_st.level1, base + SIRFSOC_INT_RISC_LEVEL1);
 119 }
 120
 121 static struct syscore_ops sirfsoc_irq_syscore_ops = {
 122         .suspend        = sirfsoc_irq_suspend,
 123         .resume         = sirfsoc_irq_resume,
 124 };
 125
 126 static int __init sirfsoc_irq_pm_init(void)
 127 {
 128         if (!sirfsoc_irqdomain)
 129                 return 0;
 130
 131         register_syscore_ops(&sirfsoc_irq_syscore_ops);
 132         return 0;
 133 }
 134 device_initcall(sirfsoc_irq_pm_init);