Merge tag 'pidfd-updates-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/braun...
[linux-2.6-microblaze.git] / drivers / irqchip / irq-clps711x.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  CLPS711X IRQ driver
4  *
5  *  Copyright (C) 2013 Alexander Shiyan <shc_work@mail.ru>
6  */
7
8 #include <linux/io.h>
9 #include <linux/irq.h>
10 #include <linux/irqchip.h>
11 #include <linux/irqdomain.h>
12 #include <linux/of_address.h>
13 #include <linux/of_irq.h>
14 #include <linux/slab.h>
15
16 #include <asm/exception.h>
17 #include <asm/mach/irq.h>
18
19 #define CLPS711X_INTSR1 (0x0240)
20 #define CLPS711X_INTMR1 (0x0280)
21 #define CLPS711X_BLEOI  (0x0600)
22 #define CLPS711X_MCEOI  (0x0640)
23 #define CLPS711X_TEOI   (0x0680)
24 #define CLPS711X_TC1EOI (0x06c0)
25 #define CLPS711X_TC2EOI (0x0700)
26 #define CLPS711X_RTCEOI (0x0740)
27 #define CLPS711X_UMSEOI (0x0780)
28 #define CLPS711X_COEOI  (0x07c0)
29 #define CLPS711X_INTSR2 (0x1240)
30 #define CLPS711X_INTMR2 (0x1280)
31 #define CLPS711X_SRXEOF (0x1600)
32 #define CLPS711X_KBDEOI (0x1700)
33 #define CLPS711X_INTSR3 (0x2240)
34 #define CLPS711X_INTMR3 (0x2280)
35
36 static const struct {
37 #define CLPS711X_FLAG_EN        (1 << 0)
38 #define CLPS711X_FLAG_FIQ       (1 << 1)
39         unsigned int    flags;
40         phys_addr_t     eoi;
41 } clps711x_irqs[] = {
42         [1]     = { CLPS711X_FLAG_FIQ, CLPS711X_BLEOI, },
43         [3]     = { CLPS711X_FLAG_FIQ, CLPS711X_MCEOI, },
44         [4]     = { CLPS711X_FLAG_EN, CLPS711X_COEOI, },
45         [5]     = { CLPS711X_FLAG_EN, },
46         [6]     = { CLPS711X_FLAG_EN, },
47         [7]     = { CLPS711X_FLAG_EN, },
48         [8]     = { CLPS711X_FLAG_EN, CLPS711X_TC1EOI, },
49         [9]     = { CLPS711X_FLAG_EN, CLPS711X_TC2EOI, },
50         [10]    = { CLPS711X_FLAG_EN, CLPS711X_RTCEOI, },
51         [11]    = { CLPS711X_FLAG_EN, CLPS711X_TEOI, },
52         [12]    = { CLPS711X_FLAG_EN, },
53         [13]    = { CLPS711X_FLAG_EN, },
54         [14]    = { CLPS711X_FLAG_EN, CLPS711X_UMSEOI, },
55         [15]    = { CLPS711X_FLAG_EN, CLPS711X_SRXEOF, },
56         [16]    = { CLPS711X_FLAG_EN, CLPS711X_KBDEOI, },
57         [17]    = { CLPS711X_FLAG_EN, },
58         [18]    = { CLPS711X_FLAG_EN, },
59         [28]    = { CLPS711X_FLAG_EN, },
60         [29]    = { CLPS711X_FLAG_EN, },
61         [32]    = { CLPS711X_FLAG_FIQ, },
62 };
63
64 static struct {
65         void __iomem            *base;
66         void __iomem            *intmr[3];
67         void __iomem            *intsr[3];
68         struct irq_domain       *domain;
69         struct irq_domain_ops   ops;
70 } *clps711x_intc;
71
72 static asmlinkage void __exception_irq_entry clps711x_irqh(struct pt_regs *regs)
73 {
74         u32 irqstat;
75
76         do {
77                 irqstat = readw_relaxed(clps711x_intc->intmr[0]) &
78                           readw_relaxed(clps711x_intc->intsr[0]);
79                 if (irqstat)
80                         handle_domain_irq(clps711x_intc->domain,
81                                           fls(irqstat) - 1, regs);
82
83                 irqstat = readw_relaxed(clps711x_intc->intmr[1]) &
84                           readw_relaxed(clps711x_intc->intsr[1]);
85                 if (irqstat)
86                         handle_domain_irq(clps711x_intc->domain,
87                                           fls(irqstat) - 1 + 16, regs);
88         } while (irqstat);
89 }
90
91 static void clps711x_intc_eoi(struct irq_data *d)
92 {
93         irq_hw_number_t hwirq = irqd_to_hwirq(d);
94
95         writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hwirq].eoi);
96 }
97
98 static void clps711x_intc_mask(struct irq_data *d)
99 {
100         irq_hw_number_t hwirq = irqd_to_hwirq(d);
101         void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
102         u32 tmp;
103
104         tmp = readl_relaxed(intmr);
105         tmp &= ~(1 << (hwirq % 16));
106         writel_relaxed(tmp, intmr);
107 }
108
109 static void clps711x_intc_unmask(struct irq_data *d)
110 {
111         irq_hw_number_t hwirq = irqd_to_hwirq(d);
112         void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
113         u32 tmp;
114
115         tmp = readl_relaxed(intmr);
116         tmp |= 1 << (hwirq % 16);
117         writel_relaxed(tmp, intmr);
118 }
119
120 static struct irq_chip clps711x_intc_chip = {
121         .name           = "clps711x-intc",
122         .irq_eoi        = clps711x_intc_eoi,
123         .irq_mask       = clps711x_intc_mask,
124         .irq_unmask     = clps711x_intc_unmask,
125 };
126
127 static int __init clps711x_intc_irq_map(struct irq_domain *h, unsigned int virq,
128                                         irq_hw_number_t hw)
129 {
130         irq_flow_handler_t handler = handle_level_irq;
131         unsigned int flags = 0;
132
133         if (!clps711x_irqs[hw].flags)
134                 return 0;
135
136         if (clps711x_irqs[hw].flags & CLPS711X_FLAG_FIQ) {
137                 handler = handle_bad_irq;
138                 flags |= IRQ_NOAUTOEN;
139         } else if (clps711x_irqs[hw].eoi) {
140                 handler = handle_fasteoi_irq;
141         }
142
143         /* Clear down pending interrupt */
144         if (clps711x_irqs[hw].eoi)
145                 writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hw].eoi);
146
147         irq_set_chip_and_handler(virq, &clps711x_intc_chip, handler);
148         irq_modify_status(virq, IRQ_NOPROBE, flags);
149
150         return 0;
151 }
152
153 static int __init _clps711x_intc_init(struct device_node *np,
154                                       phys_addr_t base, resource_size_t size)
155 {
156         int err;
157
158         clps711x_intc = kzalloc(sizeof(*clps711x_intc), GFP_KERNEL);
159         if (!clps711x_intc)
160                 return -ENOMEM;
161
162         clps711x_intc->base = ioremap(base, size);
163         if (!clps711x_intc->base) {
164                 err = -ENOMEM;
165                 goto out_kfree;
166         }
167
168         clps711x_intc->intsr[0] = clps711x_intc->base + CLPS711X_INTSR1;
169         clps711x_intc->intmr[0] = clps711x_intc->base + CLPS711X_INTMR1;
170         clps711x_intc->intsr[1] = clps711x_intc->base + CLPS711X_INTSR2;
171         clps711x_intc->intmr[1] = clps711x_intc->base + CLPS711X_INTMR2;
172         clps711x_intc->intsr[2] = clps711x_intc->base + CLPS711X_INTSR3;
173         clps711x_intc->intmr[2] = clps711x_intc->base + CLPS711X_INTMR3;
174
175         /* Mask all interrupts */
176         writel_relaxed(0, clps711x_intc->intmr[0]);
177         writel_relaxed(0, clps711x_intc->intmr[1]);
178         writel_relaxed(0, clps711x_intc->intmr[2]);
179
180         err = irq_alloc_descs(-1, 0, ARRAY_SIZE(clps711x_irqs), numa_node_id());
181         if (err < 0)
182                 goto out_iounmap;
183
184         clps711x_intc->ops.map = clps711x_intc_irq_map;
185         clps711x_intc->ops.xlate = irq_domain_xlate_onecell;
186         clps711x_intc->domain =
187                 irq_domain_add_legacy(np, ARRAY_SIZE(clps711x_irqs),
188                                       0, 0, &clps711x_intc->ops, NULL);
189         if (!clps711x_intc->domain) {
190                 err = -ENOMEM;
191                 goto out_irqfree;
192         }
193
194         irq_set_default_host(clps711x_intc->domain);
195         set_handle_irq(clps711x_irqh);
196
197 #ifdef CONFIG_FIQ
198         init_FIQ(0);
199 #endif
200
201         return 0;
202
203 out_irqfree:
204         irq_free_descs(0, ARRAY_SIZE(clps711x_irqs));
205
206 out_iounmap:
207         iounmap(clps711x_intc->base);
208
209 out_kfree:
210         kfree(clps711x_intc);
211
212         return err;
213 }
214
215 void __init clps711x_intc_init(phys_addr_t base, resource_size_t size)
216 {
217         BUG_ON(_clps711x_intc_init(NULL, base, size));
218 }
219
220 #ifdef CONFIG_IRQCHIP
221 static int __init clps711x_intc_init_dt(struct device_node *np,
222                                         struct device_node *parent)
223 {
224         struct resource res;
225         int err;
226
227         err = of_address_to_resource(np, 0, &res);
228         if (err)
229                 return err;
230
231         return _clps711x_intc_init(np, res.start, resource_size(&res));
232 }
233 IRQCHIP_DECLARE(clps711x, "cirrus,ep7209-intc", clps711x_intc_init_dt);
234 #endif