+
+#ifdef CONFIG_OF
+static int s3c24xx_irq_map_of(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ unsigned int ctrl_num = hw / 32;
+ unsigned int intc_hw = hw % 32;
+ struct s3c_irq_intc *intc = s3c_intc[ctrl_num];
+ struct s3c_irq_intc *parent_intc = intc->parent;
+ struct s3c_irq_data *irq_data = &intc->irqs[intc_hw];
+
+ /* attach controller pointer to irq_data */
+ irq_data->intc = intc;
+ irq_data->offset = intc_hw;
+
+ if (!parent_intc)
+ irq_set_chip_and_handler(virq, &s3c_irq_chip, handle_edge_irq);
+ else
+ irq_set_chip_and_handler(virq, &s3c_irq_level_chip,
+ handle_edge_irq);
+
+ irq_set_chip_data(virq, irq_data);
+
+ set_irq_flags(virq, IRQF_VALID);
+
+ return 0;
+}
+
+/* Translate our of irq notation
+ * format: <ctrl_num ctrl_irq parent_irq type>
+ */
+static int s3c24xx_irq_xlate_of(struct irq_domain *d, struct device_node *n,
+ const u32 *intspec, unsigned int intsize,
+ irq_hw_number_t *out_hwirq, unsigned int *out_type)
+{
+ struct s3c_irq_intc *intc;
+ struct s3c_irq_intc *parent_intc;
+ struct s3c_irq_data *irq_data;
+ struct s3c_irq_data *parent_irq_data;
+ int irqno;
+
+ if (WARN_ON(intsize < 4))
+ return -EINVAL;
+
+ if (intspec[0] > 2 || !s3c_intc[intspec[0]]) {
+ pr_err("controller number %d invalid\n", intspec[0]);
+ return -EINVAL;
+ }
+ intc = s3c_intc[intspec[0]];
+
+ *out_hwirq = intspec[0] * 32 + intspec[2];
+ *out_type = intspec[3] & IRQ_TYPE_SENSE_MASK;
+
+ parent_intc = intc->parent;
+ if (parent_intc) {
+ irq_data = &intc->irqs[intspec[2]];
+ irq_data->parent_irq = intspec[1];
+ parent_irq_data = &parent_intc->irqs[irq_data->parent_irq];
+ parent_irq_data->sub_intc = intc;
+ parent_irq_data->sub_bits |= (1UL << intspec[2]);
+
+ /* parent_intc is always s3c_intc[0], so no offset */
+ irqno = irq_create_mapping(parent_intc->domain, intspec[1]);
+ if (irqno < 0) {
+ pr_err("irq: could not map parent interrupt\n");
+ return irqno;
+ }
+
+ irq_set_chained_handler(irqno, s3c_irq_demux);
+ }
+
+ return 0;
+}
+
+static struct irq_domain_ops s3c24xx_irq_ops_of = {
+ .map = s3c24xx_irq_map_of,
+ .xlate = s3c24xx_irq_xlate_of,
+};
+
+struct s3c24xx_irq_of_ctrl {
+ char *name;
+ unsigned long offset;
+ struct s3c_irq_intc **handle;
+ struct s3c_irq_intc **parent;
+ struct irq_domain_ops *ops;
+};
+
+static int __init s3c_init_intc_of(struct device_node *np,
+ struct device_node *interrupt_parent,
+ struct s3c24xx_irq_of_ctrl *s3c_ctrl, int num_ctrl)
+{
+ struct s3c_irq_intc *intc;
+ struct s3c24xx_irq_of_ctrl *ctrl;
+ struct irq_domain *domain;
+ void __iomem *reg_base;
+ int i;
+
+ reg_base = of_iomap(np, 0);
+ if (!reg_base) {
+ pr_err("irq-s3c24xx: could not map irq registers\n");
+ return -EINVAL;
+ }
+
+ domain = irq_domain_add_linear(np, num_ctrl * 32,
+ &s3c24xx_irq_ops_of, NULL);
+ if (!domain) {
+ pr_err("irq: could not create irq-domain\n");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < num_ctrl; i++) {
+ ctrl = &s3c_ctrl[i];
+
+ pr_debug("irq: found controller %s\n", ctrl->name);
+
+ intc = kzalloc(sizeof(struct s3c_irq_intc), GFP_KERNEL);
+ if (!intc)
+ return -ENOMEM;
+
+ intc->domain = domain;
+ intc->irqs = kzalloc(sizeof(struct s3c_irq_data) * 32,
+ GFP_KERNEL);
+ if (!intc->irqs) {
+ kfree(intc);
+ return -ENOMEM;
+ }
+
+ if (ctrl->parent) {
+ intc->reg_pending = reg_base + ctrl->offset;
+ intc->reg_mask = reg_base + ctrl->offset + 0x4;
+
+ if (*(ctrl->parent)) {
+ intc->parent = *(ctrl->parent);
+ } else {
+ pr_warn("irq: parent of %s missing\n",
+ ctrl->name);
+ kfree(intc->irqs);
+ kfree(intc);
+ continue;
+ }
+ } else {
+ intc->reg_pending = reg_base + ctrl->offset;
+ intc->reg_mask = reg_base + ctrl->offset + 0x08;
+ intc->reg_intpnd = reg_base + ctrl->offset + 0x10;
+ }
+
+ s3c24xx_clear_intc(intc);
+ s3c_intc[i] = intc;
+ }
+
+ set_handle_irq(s3c24xx_handle_irq);
+
+ return 0;
+}
+
+static struct s3c24xx_irq_of_ctrl s3c2410_ctrl[] = {
+ {
+ .name = "intc",
+ .offset = 0,
+ }, {
+ .name = "subintc",
+ .offset = 0x18,
+ .parent = &s3c_intc[0],
+ }
+};
+
+int __init s3c2410_init_intc_of(struct device_node *np,
+ struct device_node *interrupt_parent,
+ struct s3c24xx_irq_of_ctrl *ctrl, int num_ctrl)
+{
+ return s3c_init_intc_of(np, interrupt_parent,
+ s3c2410_ctrl, ARRAY_SIZE(s3c2410_ctrl));
+}
+IRQCHIP_DECLARE(s3c2410_irq, "samsung,s3c2410-irq", s3c2410_init_intc_of);
+
+static struct s3c24xx_irq_of_ctrl s3c2416_ctrl[] = {
+ {
+ .name = "intc",
+ .offset = 0,
+ }, {
+ .name = "subintc",
+ .offset = 0x18,
+ .parent = &s3c_intc[0],
+ }, {
+ .name = "intc2",
+ .offset = 0x40,
+ }
+};
+
+int __init s3c2416_init_intc_of(struct device_node *np,
+ struct device_node *interrupt_parent,
+ struct s3c24xx_irq_of_ctrl *ctrl, int num_ctrl)
+{
+ return s3c_init_intc_of(np, interrupt_parent,
+ s3c2416_ctrl, ARRAY_SIZE(s3c2416_ctrl));
+}
+IRQCHIP_DECLARE(s3c2416_irq, "samsung,s3c2416-irq", s3c2416_init_intc_of);
+#endif