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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. | |
3 | ||
4 | #include <linux/kernel.h> | |
5 | #include <linux/init.h> | |
6 | #include <linux/of.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> | |
14 | #include <linux/io.h> | |
15 | #include <asm/irq.h> | |
16 | #include <asm/traps.h> | |
17 | #include <asm/reg_ops.h> | |
18 | ||
19 | static struct irq_domain *root_domain; | |
20 | static void __iomem *INTCG_base; | |
21 | static void __iomem *INTCL_base; | |
22 | ||
23 | #define IPI_IRQ 15 | |
24 | #define INTC_IRQS 256 | |
25 | #define COMM_IRQ_BASE 32 | |
26 | ||
27 | #define INTCG_SIZE 0x8000 | |
28 | #define INTCL_SIZE 0x1000 | |
29 | ||
30 | #define INTCG_ICTLR 0x0 | |
31 | #define INTCG_CICFGR 0x100 | |
32 | #define INTCG_CIDSTR 0x1000 | |
33 | ||
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 | |
41 | ||
42 | static DEFINE_PER_CPU(void __iomem *, intcl_reg); | |
43 | ||
44 | static void csky_mpintc_handler(struct pt_regs *regs) | |
45 | { | |
46 | void __iomem *reg_base = this_cpu_read(intcl_reg); | |
47 | ||
48 | do { | |
49 | handle_domain_irq(root_domain, | |
50 | readl_relaxed(reg_base + INTCL_RDYIR), | |
51 | regs); | |
52 | } while (readl_relaxed(reg_base + INTCL_HPPIR) & BIT(31)); | |
53 | } | |
54 | ||
55 | static void csky_mpintc_enable(struct irq_data *d) | |
56 | { | |
57 | void __iomem *reg_base = this_cpu_read(intcl_reg); | |
58 | ||
59 | writel_relaxed(d->hwirq, reg_base + INTCL_SENR); | |
60 | } | |
61 | ||
62 | static void csky_mpintc_disable(struct irq_data *d) | |
63 | { | |
64 | void __iomem *reg_base = this_cpu_read(intcl_reg); | |
65 | ||
66 | writel_relaxed(d->hwirq, reg_base + INTCL_CENR); | |
67 | } | |
68 | ||
69 | static void csky_mpintc_eoi(struct irq_data *d) | |
70 | { | |
71 | void __iomem *reg_base = this_cpu_read(intcl_reg); | |
72 | ||
73 | writel_relaxed(d->hwirq, reg_base + INTCL_CACR); | |
74 | } | |
75 | ||
76 | #ifdef CONFIG_SMP | |
77 | static int csky_irq_set_affinity(struct irq_data *d, | |
78 | const struct cpumask *mask_val, | |
79 | bool force) | |
80 | { | |
81 | unsigned int cpu; | |
82 | unsigned int offset = 4 * (d->hwirq - COMM_IRQ_BASE); | |
83 | ||
84 | if (!force) | |
85 | cpu = cpumask_any_and(mask_val, cpu_online_mask); | |
86 | else | |
87 | cpu = cpumask_first(mask_val); | |
88 | ||
89 | if (cpu >= nr_cpu_ids) | |
90 | return -EINVAL; | |
91 | ||
97b1f5aa GR |
92 | /* |
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 | |
96 | * with cpu_mask. | |
97 | * SO we only use auto deliver mode when affinity mask_val is | |
98 | * equal to cpu_present_mask. | |
99 | * | |
100 | */ | |
101 | if (cpumask_equal(mask_val, cpu_present_mask)) | |
102 | cpu = 0; | |
103 | else | |
104 | cpu |= BIT(31); | |
d8a5f5f7 GR |
105 | |
106 | writel_relaxed(cpu, INTCG_base + INTCG_CIDSTR + offset); | |
107 | ||
108 | irq_data_update_effective_affinity(d, cpumask_of(cpu)); | |
109 | ||
110 | return IRQ_SET_MASK_OK_DONE; | |
111 | } | |
112 | #endif | |
113 | ||
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, | |
119 | #ifdef CONFIG_SMP | |
120 | .irq_set_affinity = csky_irq_set_affinity, | |
121 | #endif | |
122 | }; | |
123 | ||
124 | static int csky_irqdomain_map(struct irq_domain *d, unsigned int irq, | |
125 | irq_hw_number_t hwirq) | |
126 | { | |
127 | if (hwirq < COMM_IRQ_BASE) { | |
128 | irq_set_percpu_devid(irq); | |
129 | irq_set_chip_and_handler(irq, &csky_irq_chip, | |
130 | handle_percpu_irq); | |
131 | } else { | |
132 | irq_set_chip_and_handler(irq, &csky_irq_chip, | |
133 | handle_fasteoi_irq); | |
134 | } | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static const struct irq_domain_ops csky_irqdomain_ops = { | |
140 | .map = csky_irqdomain_map, | |
141 | .xlate = irq_domain_xlate_onecell, | |
142 | }; | |
143 | ||
144 | #ifdef CONFIG_SMP | |
145 | static void csky_mpintc_send_ipi(const struct cpumask *mask) | |
146 | { | |
147 | void __iomem *reg_base = this_cpu_read(intcl_reg); | |
148 | ||
149 | /* | |
150 | * INTCL_SIGR[3:0] INTID | |
151 | * INTCL_SIGR[8:15] CPUMASK | |
152 | */ | |
153 | writel_relaxed((*cpumask_bits(mask)) << 8 | IPI_IRQ, | |
154 | reg_base + INTCL_SIGR); | |
155 | } | |
156 | #endif | |
157 | ||
158 | /* C-SKY multi processor interrupt controller */ | |
159 | static int __init | |
160 | csky_mpintc_init(struct device_node *node, struct device_node *parent) | |
161 | { | |
162 | int ret; | |
163 | unsigned int cpu, nr_irq; | |
164 | #ifdef CONFIG_SMP | |
165 | unsigned int ipi_irq; | |
166 | #endif | |
167 | ||
168 | if (parent) | |
169 | return 0; | |
170 | ||
171 | ret = of_property_read_u32(node, "csky,num-irqs", &nr_irq); | |
172 | if (ret < 0) | |
173 | nr_irq = INTC_IRQS; | |
174 | ||
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) | |
179 | return -EIO; | |
180 | ||
181 | INTCL_base = INTCG_base + INTCG_SIZE; | |
182 | ||
183 | writel_relaxed(BIT(0), INTCG_base + INTCG_ICTLR); | |
184 | } | |
185 | ||
186 | root_domain = irq_domain_add_linear(node, nr_irq, &csky_irqdomain_ops, | |
187 | NULL); | |
188 | if (!root_domain) | |
189 | return -ENXIO; | |
190 | ||
191 | /* for every cpu */ | |
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); | |
195 | } | |
196 | ||
197 | set_handle_irq(&csky_mpintc_handler); | |
198 | ||
199 | #ifdef CONFIG_SMP | |
200 | ipi_irq = irq_create_mapping(root_domain, IPI_IRQ); | |
201 | if (!ipi_irq) | |
202 | return -EIO; | |
203 | ||
204 | set_send_ipi(&csky_mpintc_send_ipi, ipi_irq); | |
205 | #endif | |
206 | ||
207 | return 0; | |
208 | } | |
209 | IRQCHIP_DECLARE(csky_mpintc, "csky,mpintc", csky_mpintc_init); |