1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
4 #include <linux/kernel.h>
5 #include <linux/init.h>
7 #include <linux/of_address.h>
8 #include <linux/module.h>
9 #include <linux/irqdomain.h>
10 #include <linux/irqchip.h>
11 #include <linux/irq.h>
12 #include <linux/interrupt.h>
13 #include <linux/smp.h>
16 #include <asm/traps.h>
17 #include <asm/reg_ops.h>
19 static struct irq_domain *root_domain;
20 static void __iomem *INTCG_base;
21 static void __iomem *INTCL_base;
25 #define COMM_IRQ_BASE 32
27 #define INTCG_SIZE 0x8000
28 #define INTCL_SIZE 0x1000
30 #define INTCG_ICTLR 0x0
31 #define INTCG_CICFGR 0x100
32 #define INTCG_CIDSTR 0x1000
34 #define INTCL_PICTLR 0x0
35 #define INTCL_SIGR 0x60
36 #define INTCL_HPPIR 0x68
37 #define INTCL_RDYIR 0x6c
38 #define INTCL_SENR 0xa0
39 #define INTCL_CENR 0xa4
40 #define INTCL_CACR 0xb4
42 static DEFINE_PER_CPU(void __iomem *, intcl_reg);
44 static void csky_mpintc_handler(struct pt_regs *regs)
46 void __iomem *reg_base = this_cpu_read(intcl_reg);
49 handle_domain_irq(root_domain,
50 readl_relaxed(reg_base + INTCL_RDYIR),
52 } while (readl_relaxed(reg_base + INTCL_HPPIR) & BIT(31));
55 static void csky_mpintc_enable(struct irq_data *d)
57 void __iomem *reg_base = this_cpu_read(intcl_reg);
59 writel_relaxed(d->hwirq, reg_base + INTCL_SENR);
62 static void csky_mpintc_disable(struct irq_data *d)
64 void __iomem *reg_base = this_cpu_read(intcl_reg);
66 writel_relaxed(d->hwirq, reg_base + INTCL_CENR);
69 static void csky_mpintc_eoi(struct irq_data *d)
71 void __iomem *reg_base = this_cpu_read(intcl_reg);
73 writel_relaxed(d->hwirq, reg_base + INTCL_CACR);
77 static int csky_irq_set_affinity(struct irq_data *d,
78 const struct cpumask *mask_val,
82 unsigned int offset = 4 * (d->hwirq - COMM_IRQ_BASE);
85 cpu = cpumask_any_and(mask_val, cpu_online_mask);
87 cpu = cpumask_first(mask_val);
89 if (cpu >= nr_cpu_ids)
93 * The csky,mpintc could support auto irq deliver, but it only
94 * could deliver external irq to one cpu or all cpus. So it
95 * doesn't support deliver external irq to a group of cpus
97 * SO we only use auto deliver mode when affinity mask_val is
98 * equal to cpu_present_mask.
101 if (cpumask_equal(mask_val, cpu_present_mask))
106 writel_relaxed(cpu, INTCG_base + INTCG_CIDSTR + offset);
108 irq_data_update_effective_affinity(d, cpumask_of(cpu));
110 return IRQ_SET_MASK_OK_DONE;
114 static struct irq_chip csky_irq_chip = {
115 .name = "C-SKY SMP Intc",
116 .irq_eoi = csky_mpintc_eoi,
117 .irq_enable = csky_mpintc_enable,
118 .irq_disable = csky_mpintc_disable,
120 .irq_set_affinity = csky_irq_set_affinity,
124 static int csky_irqdomain_map(struct irq_domain *d, unsigned int irq,
125 irq_hw_number_t hwirq)
127 if (hwirq < COMM_IRQ_BASE) {
128 irq_set_percpu_devid(irq);
129 irq_set_chip_and_handler(irq, &csky_irq_chip,
132 irq_set_chip_and_handler(irq, &csky_irq_chip,
139 static const struct irq_domain_ops csky_irqdomain_ops = {
140 .map = csky_irqdomain_map,
141 .xlate = irq_domain_xlate_onecell,
145 static void csky_mpintc_send_ipi(const struct cpumask *mask)
147 void __iomem *reg_base = this_cpu_read(intcl_reg);
150 * INTCL_SIGR[3:0] INTID
151 * INTCL_SIGR[8:15] CPUMASK
153 writel_relaxed((*cpumask_bits(mask)) << 8 | IPI_IRQ,
154 reg_base + INTCL_SIGR);
158 /* C-SKY multi processor interrupt controller */
160 csky_mpintc_init(struct device_node *node, struct device_node *parent)
163 unsigned int cpu, nr_irq;
165 unsigned int ipi_irq;
171 ret = of_property_read_u32(node, "csky,num-irqs", &nr_irq);
175 if (INTCG_base == NULL) {
176 INTCG_base = ioremap(mfcr("cr<31, 14>"),
177 INTCL_SIZE*nr_cpu_ids + INTCG_SIZE);
178 if (INTCG_base == NULL)
181 INTCL_base = INTCG_base + INTCG_SIZE;
183 writel_relaxed(BIT(0), INTCG_base + INTCG_ICTLR);
186 root_domain = irq_domain_add_linear(node, nr_irq, &csky_irqdomain_ops,
192 for_each_present_cpu(cpu) {
193 per_cpu(intcl_reg, cpu) = INTCL_base + (INTCL_SIZE * cpu);
194 writel_relaxed(BIT(0), per_cpu(intcl_reg, cpu) + INTCL_PICTLR);
197 set_handle_irq(&csky_mpintc_handler);
200 ipi_irq = irq_create_mapping(root_domain, IPI_IRQ);
204 set_send_ipi(&csky_mpintc_send_ipi, ipi_irq);
209 IRQCHIP_DECLARE(csky_mpintc, "csky,mpintc", csky_mpintc_init);