drivers/irqchip/irq-ingenic.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
   4  *  Ingenic XBurst platform IRQ support
   5  */
   6
   7 #include <linux/errno.h>
   8 #include <linux/init.h>
   9 #include <linux/types.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/ioport.h>
  12 #include <linux/irqchip.h>
  13 #include <linux/of_address.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/timex.h>
  16 #include <linux/slab.h>
  17 #include <linux/delay.h>
  18
  19 #include <asm/io.h>
  20
  21 struct ingenic_intc_data {
  22         void __iomem *base;
  23         struct irq_domain *domain;
  24         unsigned num_chips;
  25 };
  26
  27 #define JZ_REG_INTC_STATUS      0x00
  28 #define JZ_REG_INTC_MASK        0x04
  29 #define JZ_REG_INTC_SET_MASK    0x08
  30 #define JZ_REG_INTC_CLEAR_MASK  0x0c
  31 #define JZ_REG_INTC_PENDING     0x10
  32 #define CHIP_SIZE               0x20
  33
  34 static irqreturn_t intc_cascade(int irq, void *data)
  35 {
  36         struct ingenic_intc_data *intc = irq_get_handler_data(irq);
  37         struct irq_domain *domain = intc->domain;
  38         struct irq_chip_generic *gc;
  39         uint32_t pending;
  40         unsigned i;
  41
  42         for (i = 0; i < intc->num_chips; i++) {
  43                 gc = irq_get_domain_generic_chip(domain, i * 32);
  44
  45                 pending = irq_reg_readl(gc, JZ_REG_INTC_PENDING);
  46                 if (!pending)
  47                         continue;
  48
  49                 while (pending) {
  50                         int bit = __fls(pending);
  51
  52                         generic_handle_domain_irq(domain, bit + (i * 32));
  53                         pending &= ~BIT(bit);
  54                 }
  55         }
  56
  57         return IRQ_HANDLED;
  58 }
  59
  60 static int __init ingenic_intc_of_init(struct device_node *node,
  61                                        unsigned num_chips)
  62 {
  63         struct ingenic_intc_data *intc;
  64         struct irq_chip_generic *gc;
  65         struct irq_chip_type *ct;
  66         struct irq_domain *domain;
  67         int parent_irq, err = 0;
  68         unsigned i;
  69
  70         intc = kzalloc(sizeof(*intc), GFP_KERNEL);
  71         if (!intc) {
  72                 err = -ENOMEM;
  73                 goto out_err;
  74         }
  75
  76         parent_irq = irq_of_parse_and_map(node, 0);
  77         if (!parent_irq) {
  78                 err = -EINVAL;
  79                 goto out_free;
  80         }
  81
  82         err = irq_set_handler_data(parent_irq, intc);
  83         if (err)
  84                 goto out_unmap_irq;
  85
  86         intc->num_chips = num_chips;
  87         intc->base = of_iomap(node, 0);
  88         if (!intc->base) {
  89                 err = -ENODEV;
  90                 goto out_unmap_irq;
  91         }
  92
  93         domain = irq_domain_add_linear(node, num_chips * 32,
  94                                        &irq_generic_chip_ops, NULL);
  95         if (!domain) {
  96                 err = -ENOMEM;
  97                 goto out_unmap_base;
  98         }
  99
 100         intc->domain = domain;
 101
 102         err = irq_alloc_domain_generic_chips(domain, 32, 1, "INTC",
 103                                              handle_level_irq, 0,
 104                                              IRQ_NOPROBE | IRQ_LEVEL, 0);
 105         if (err)
 106                 goto out_domain_remove;
 107
 108         for (i = 0; i < num_chips; i++) {
 109                 gc = irq_get_domain_generic_chip(domain, i * 32);
 110
 111                 gc->wake_enabled = IRQ_MSK(32);
 112                 gc->reg_base = intc->base + (i * CHIP_SIZE);
 113
 114                 ct = gc->chip_types;
 115                 ct->regs.enable = JZ_REG_INTC_CLEAR_MASK;
 116                 ct->regs.disable = JZ_REG_INTC_SET_MASK;
 117                 ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
 118                 ct->chip.irq_mask = irq_gc_mask_disable_reg;
 119                 ct->chip.irq_mask_ack = irq_gc_mask_disable_reg;
 120                 ct->chip.irq_set_wake = irq_gc_set_wake;
 121                 ct->chip.flags = IRQCHIP_MASK_ON_SUSPEND;
 122
 123                 /* Mask all irqs */
 124                 irq_reg_writel(gc, IRQ_MSK(32), JZ_REG_INTC_SET_MASK);
 125         }
 126
 127         if (request_irq(parent_irq, intc_cascade, IRQF_NO_SUSPEND,
 128                         "SoC intc cascade interrupt", NULL))
 129                 pr_err("Failed to register SoC intc cascade interrupt\n");
 130         return 0;
 131
 132 out_domain_remove:
 133         irq_domain_remove(domain);
 134 out_unmap_base:
 135         iounmap(intc->base);
 136 out_unmap_irq:
 137         irq_dispose_mapping(parent_irq);
 138 out_free:
 139         kfree(intc);
 140 out_err:
 141         return err;
 142 }
 143
 144 static int __init intc_1chip_of_init(struct device_node *node,
 145                                      struct device_node *parent)
 146 {
 147         return ingenic_intc_of_init(node, 1);
 148 }
 149 IRQCHIP_DECLARE(jz4740_intc, "ingenic,jz4740-intc", intc_1chip_of_init);
 150 IRQCHIP_DECLARE(jz4725b_intc, "ingenic,jz4725b-intc", intc_1chip_of_init);
 151
 152 static int __init intc_2chip_of_init(struct device_node *node,
 153         struct device_node *parent)
 154 {
 155         return ingenic_intc_of_init(node, 2);
 156 }
 157 IRQCHIP_DECLARE(jz4760_intc, "ingenic,jz4760-intc", intc_2chip_of_init);
 158 IRQCHIP_DECLARE(jz4770_intc, "ingenic,jz4770-intc", intc_2chip_of_init);
 159 IRQCHIP_DECLARE(jz4775_intc, "ingenic,jz4775-intc", intc_2chip_of_init);
 160 IRQCHIP_DECLARE(jz4780_intc, "ingenic,jz4780-intc", intc_2chip_of_init);