1 #include <linux/irqdomain.h>
4 #include <linux/of_address.h>
5 #include <linux/of_irq.h>
6 #include <linux/irqchip/chained_irq.h>
9 #include <linux/version.h>
11 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
14 # include <linux/irqchip.h>
17 struct rps_chip_data {
20 struct irq_domain *domain;
35 * Routines to acknowledge, disable and enable interrupts
37 static void rps_mask_irq(struct irq_data *d)
39 struct rps_chip_data *chip_data = irq_data_get_irq_chip_data(d);
40 u32 mask = BIT(d->hwirq);
42 iowrite32(mask, chip_data->base + RPS_MASK);
45 static void rps_unmask_irq(struct irq_data *d)
47 struct rps_chip_data *chip_data = irq_data_get_irq_chip_data(d);
48 u32 mask = BIT(d->hwirq);
50 iowrite32(mask, chip_data->base + RPS_UNMASK);
53 static struct irq_chip rps_chip = {
55 .irq_mask = rps_mask_irq,
56 .irq_unmask = rps_unmask_irq,
59 static int rps_irq_domain_xlate(struct irq_domain *d,
60 struct device_node *controller,
61 const u32 *intspec, unsigned int intsize,
62 unsigned long *out_hwirq,
63 unsigned int *out_type)
65 if (d->of_node != controller)
70 *out_hwirq = intspec[0];
71 /* Honestly I do not know the type */
72 *out_type = IRQ_TYPE_LEVEL_HIGH;
77 static int rps_irq_domain_map(struct irq_domain *d, unsigned int irq,
80 irq_set_chip_and_handler(irq, &rps_chip, handle_level_irq);
81 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
82 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
86 irq_set_chip_data(irq, d->host_data);
90 const struct irq_domain_ops rps_irq_domain_ops = {
91 .map = rps_irq_domain_map,
92 .xlate = rps_irq_domain_xlate,
95 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
96 static void rps_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
98 static void rps_handle_cascade_irq(struct irq_desc *desc)
101 struct rps_chip_data *chip_data = irq_desc_get_handler_data(desc);
102 struct irq_chip *chip = irq_desc_get_chip(desc);
103 unsigned int cascade_irq, rps_irq;
106 chained_irq_enter(chip, desc);
108 status = ioread32(chip_data->base + RPS_STATUS);
109 rps_irq = __ffs(status);
110 cascade_irq = irq_find_mapping(chip_data->domain, rps_irq);
112 if (unlikely(rps_irq >= RPS_IRQ_COUNT))
113 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
114 handle_bad_irq(cascade_irq, desc);
116 handle_bad_irq(desc);
119 generic_handle_irq(cascade_irq);
121 chained_irq_exit(chip, desc);
125 int __init rps_of_init(struct device_node *node, struct device_node *parent)
127 void __iomem *rps_base;
128 int irq_start = RPS_IRQ_BASE;
135 rps_base = of_iomap(node, 0);
136 WARN(!rps_base, "unable to map rps registers\n");
137 rps_data.base = rps_base;
139 irq_base = irq_alloc_descs(irq_start, 0, RPS_IRQ_COUNT, numa_node_id());
140 if (IS_ERR_VALUE(irq_base)) {
141 WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
143 irq_base = irq_start;
146 rps_data.domain = irq_domain_add_legacy(node, RPS_IRQ_COUNT, irq_base,
147 PRS_HWIRQ_BASE, &rps_irq_domain_ops, &rps_data);
149 if (WARN_ON(!rps_data.domain))
153 irq = irq_of_parse_and_map(node, 0);
154 if (irq_set_handler_data(irq, &rps_data) != 0)
156 irq_set_chained_handler(irq, rps_handle_cascade_irq);
162 IRQCHIP_DECLARE(nas782x, "plxtech,nas782x-rps", rps_of_init);