drivers/irqchip/irq-ativic32.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2005-2017 Andes Technology Corporation
   3
   4 #include <linux/irq.h>
   5 #include <linux/of.h>
   6 #include <linux/of_irq.h>
   7 #include <linux/of_address.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/irqdomain.h>
  10 #include <linux/irqchip.h>
  11 #include <nds32_intrinsic.h>
  12
  13 unsigned long wake_mask;
  14
  15 static void ativic32_ack_irq(struct irq_data *data)
  16 {
  17         __nds32__mtsr_dsb(BIT(data->hwirq), NDS32_SR_INT_PEND2);
  18 }
  19
  20 static void ativic32_mask_irq(struct irq_data *data)
  21 {
  22         unsigned long int_mask2 = __nds32__mfsr(NDS32_SR_INT_MASK2);
  23         __nds32__mtsr_dsb(int_mask2 & (~(BIT(data->hwirq))), NDS32_SR_INT_MASK2);
  24 }
  25
  26 static void ativic32_unmask_irq(struct irq_data *data)
  27 {
  28         unsigned long int_mask2 = __nds32__mfsr(NDS32_SR_INT_MASK2);
  29         __nds32__mtsr_dsb(int_mask2 | (BIT(data->hwirq)), NDS32_SR_INT_MASK2);
  30 }
  31
  32 static int nointc_set_wake(struct irq_data *data, unsigned int on)
  33 {
  34         unsigned long int_mask = __nds32__mfsr(NDS32_SR_INT_MASK);
  35         static unsigned long irq_orig_bit;
  36         u32 bit = 1 << data->hwirq;
  37
  38         if (on) {
  39                 if (int_mask & bit)
  40                         __assign_bit(data->hwirq, &irq_orig_bit, true);
  41                 else
  42                         __assign_bit(data->hwirq, &irq_orig_bit, false);
  43
  44                 __assign_bit(data->hwirq, &int_mask, true);
  45                 __assign_bit(data->hwirq, &wake_mask, true);
  46
  47         } else {
  48                 if (!(irq_orig_bit & bit))
  49                         __assign_bit(data->hwirq, &int_mask, false);
  50
  51                 __assign_bit(data->hwirq, &wake_mask, false);
  52                 __assign_bit(data->hwirq, &irq_orig_bit, false);
  53         }
  54
  55         __nds32__mtsr_dsb(int_mask, NDS32_SR_INT_MASK);
  56
  57         return 0;
  58 }
  59
  60 static struct irq_chip ativic32_chip = {
  61         .name = "ativic32",
  62         .irq_ack = ativic32_ack_irq,
  63         .irq_mask = ativic32_mask_irq,
  64         .irq_unmask = ativic32_unmask_irq,
  65         .irq_set_wake = nointc_set_wake,
  66 };
  67
  68 static unsigned int __initdata nivic_map[6] = { 6, 2, 10, 16, 24, 32 };
  69
  70 static struct irq_domain *root_domain;
  71 static int ativic32_irq_domain_map(struct irq_domain *id, unsigned int virq,
  72                                   irq_hw_number_t hw)
  73 {
  74
  75         unsigned long int_trigger_type;
  76         u32 type;
  77         struct irq_data *irq_data;
  78         int_trigger_type = __nds32__mfsr(NDS32_SR_INT_TRIGGER);
  79         irq_data = irq_get_irq_data(virq);
  80         if (!irq_data)
  81                 return -EINVAL;
  82
  83         if (int_trigger_type & (BIT(hw))) {
  84                 irq_set_chip_and_handler(virq, &ativic32_chip, handle_edge_irq);
  85                 type = IRQ_TYPE_EDGE_RISING;
  86         } else {
  87                 irq_set_chip_and_handler(virq, &ativic32_chip, handle_level_irq);
  88                 type = IRQ_TYPE_LEVEL_HIGH;
  89         }
  90
  91         irqd_set_trigger_type(irq_data, type);
  92         return 0;
  93 }
  94
  95 static struct irq_domain_ops ativic32_ops = {
  96         .map = ativic32_irq_domain_map,
  97         .xlate = irq_domain_xlate_onecell
  98 };
  99
 100 static irq_hw_number_t get_intr_src(void)
 101 {
 102         return ((__nds32__mfsr(NDS32_SR_ITYPE) & ITYPE_mskVECTOR) >> ITYPE_offVECTOR)
 103                 - NDS32_VECTOR_offINTERRUPT;
 104 }
 105
 106 asmlinkage void asm_do_IRQ(struct pt_regs *regs)
 107 {
 108         irq_hw_number_t hwirq = get_intr_src();
 109         handle_domain_irq(root_domain, hwirq, regs);
 110 }
 111
 112 int __init ativic32_init_irq(struct device_node *node, struct device_node *parent)
 113 {
 114         unsigned long int_vec_base, nivic, nr_ints;
 115
 116         if (WARN(parent, "non-root ativic32 are not supported"))
 117                 return -EINVAL;
 118
 119         int_vec_base = __nds32__mfsr(NDS32_SR_IVB);
 120
 121         if (((int_vec_base & IVB_mskIVIC_VER) >> IVB_offIVIC_VER) == 0)
 122                 panic("Unable to use atcivic32 for this cpu.\n");
 123
 124         nivic = (int_vec_base & IVB_mskNIVIC) >> IVB_offNIVIC;
 125         if (nivic >= ARRAY_SIZE(nivic_map))
 126                 panic("The number of input for ativic32 is not supported.\n");
 127
 128         nr_ints = nivic_map[nivic];
 129
 130         root_domain = irq_domain_add_linear(node, nr_ints,
 131                         &ativic32_ops, NULL);
 132
 133         if (!root_domain)
 134                 panic("%s: unable to create IRQ domain\n", node->full_name);
 135
 136         return 0;
 137 }
 138 IRQCHIP_DECLARE(ativic32, "andestech,ativic32", ativic32_init_irq);