blob: 33340dc97d1da14977dcf0ad1c88cef1250b1f94 [file] [log] [blame]
Alexander Shiyanafc98d92014-02-02 12:07:46 +04001/*
2 * CLPS711X IRQ driver
3 *
4 * Copyright (C) 2013 Alexander Shiyan <shc_work@mail.ru>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/io.h>
13#include <linux/irq.h>
14#include <linux/irqdomain.h>
15#include <linux/of_address.h>
16#include <linux/of_irq.h>
17#include <linux/slab.h>
18
19#include <asm/exception.h>
20#include <asm/mach/irq.h>
21
22#include "irqchip.h"
23
24#define CLPS711X_INTSR1 (0x0240)
25#define CLPS711X_INTMR1 (0x0280)
26#define CLPS711X_BLEOI (0x0600)
27#define CLPS711X_MCEOI (0x0640)
28#define CLPS711X_TEOI (0x0680)
29#define CLPS711X_TC1EOI (0x06c0)
30#define CLPS711X_TC2EOI (0x0700)
31#define CLPS711X_RTCEOI (0x0740)
32#define CLPS711X_UMSEOI (0x0780)
33#define CLPS711X_COEOI (0x07c0)
34#define CLPS711X_INTSR2 (0x1240)
35#define CLPS711X_INTMR2 (0x1280)
36#define CLPS711X_SRXEOF (0x1600)
37#define CLPS711X_KBDEOI (0x1700)
38#define CLPS711X_INTSR3 (0x2240)
39#define CLPS711X_INTMR3 (0x2280)
40
41static const struct {
42#define CLPS711X_FLAG_EN (1 << 0)
43#define CLPS711X_FLAG_FIQ (1 << 1)
44 unsigned int flags;
45 phys_addr_t eoi;
46} clps711x_irqs[] = {
47 [1] = { CLPS711X_FLAG_FIQ, CLPS711X_BLEOI, },
48 [3] = { CLPS711X_FLAG_FIQ, CLPS711X_MCEOI, },
49 [4] = { CLPS711X_FLAG_EN, CLPS711X_COEOI, },
50 [5] = { CLPS711X_FLAG_EN, },
51 [6] = { CLPS711X_FLAG_EN, },
52 [7] = { CLPS711X_FLAG_EN, },
53 [8] = { CLPS711X_FLAG_EN, CLPS711X_TC1EOI, },
54 [9] = { CLPS711X_FLAG_EN, CLPS711X_TC2EOI, },
55 [10] = { CLPS711X_FLAG_EN, CLPS711X_RTCEOI, },
56 [11] = { CLPS711X_FLAG_EN, CLPS711X_TEOI, },
57 [12] = { CLPS711X_FLAG_EN, },
58 [13] = { CLPS711X_FLAG_EN, },
59 [14] = { CLPS711X_FLAG_EN, CLPS711X_UMSEOI, },
60 [15] = { CLPS711X_FLAG_EN, CLPS711X_SRXEOF, },
61 [16] = { CLPS711X_FLAG_EN, CLPS711X_KBDEOI, },
62 [17] = { CLPS711X_FLAG_EN, },
63 [18] = { CLPS711X_FLAG_EN, },
64 [28] = { CLPS711X_FLAG_EN, },
65 [29] = { CLPS711X_FLAG_EN, },
66 [32] = { CLPS711X_FLAG_FIQ, },
67};
68
69static struct {
70 void __iomem *base;
71 void __iomem *intmr[3];
72 void __iomem *intsr[3];
73 struct irq_domain *domain;
74 struct irq_domain_ops ops;
75} *clps711x_intc;
76
77static asmlinkage void __exception_irq_entry clps711x_irqh(struct pt_regs *regs)
78{
79 u32 irqnr, irqstat;
80
81 do {
82 irqstat = readw_relaxed(clps711x_intc->intmr[0]) &
83 readw_relaxed(clps711x_intc->intsr[0]);
84 if (irqstat) {
85 irqnr = irq_find_mapping(clps711x_intc->domain,
86 fls(irqstat) - 1);
87 handle_IRQ(irqnr, regs);
88 }
89
90 irqstat = readw_relaxed(clps711x_intc->intmr[1]) &
91 readw_relaxed(clps711x_intc->intsr[1]);
92 if (irqstat) {
93 irqnr = irq_find_mapping(clps711x_intc->domain,
94 fls(irqstat) - 1 + 16);
95 handle_IRQ(irqnr, regs);
96 }
97 } while (irqstat);
98}
99
100static void clps711x_intc_eoi(struct irq_data *d)
101{
102 irq_hw_number_t hwirq = irqd_to_hwirq(d);
103
104 writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hwirq].eoi);
105}
106
107static void clps711x_intc_mask(struct irq_data *d)
108{
109 irq_hw_number_t hwirq = irqd_to_hwirq(d);
110 void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
111 u32 tmp;
112
113 tmp = readl_relaxed(intmr);
114 tmp &= ~(1 << (hwirq % 16));
115 writel_relaxed(tmp, intmr);
116}
117
118static void clps711x_intc_unmask(struct irq_data *d)
119{
120 irq_hw_number_t hwirq = irqd_to_hwirq(d);
121 void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
122 u32 tmp;
123
124 tmp = readl_relaxed(intmr);
125 tmp |= 1 << (hwirq % 16);
126 writel_relaxed(tmp, intmr);
127}
128
129static struct irq_chip clps711x_intc_chip = {
130 .name = "clps711x-intc",
131 .irq_eoi = clps711x_intc_eoi,
132 .irq_mask = clps711x_intc_mask,
133 .irq_unmask = clps711x_intc_unmask,
134};
135
136static int __init clps711x_intc_irq_map(struct irq_domain *h, unsigned int virq,
137 irq_hw_number_t hw)
138{
139 irq_flow_handler_t handler = handle_level_irq;
140 unsigned int flags = IRQF_VALID | IRQF_PROBE;
141
142 if (!clps711x_irqs[hw].flags)
143 return 0;
144
145 if (clps711x_irqs[hw].flags & CLPS711X_FLAG_FIQ) {
146 handler = handle_bad_irq;
147 flags |= IRQF_NOAUTOEN;
148 } else if (clps711x_irqs[hw].eoi) {
149 handler = handle_fasteoi_irq;
150 }
151
152 /* Clear down pending interrupt */
153 if (clps711x_irqs[hw].eoi)
154 writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hw].eoi);
155
156 irq_set_chip_and_handler(virq, &clps711x_intc_chip, handler);
157 set_irq_flags(virq, flags);
158
159 return 0;
160}
161
162static int __init _clps711x_intc_init(struct device_node *np,
163 phys_addr_t base, resource_size_t size)
164{
165 int err;
166
167 clps711x_intc = kzalloc(sizeof(*clps711x_intc), GFP_KERNEL);
168 if (!clps711x_intc)
169 return -ENOMEM;
170
171 clps711x_intc->base = ioremap(base, size);
172 if (!clps711x_intc->base) {
173 err = -ENOMEM;
174 goto out_kfree;
175 }
176
177 clps711x_intc->intsr[0] = clps711x_intc->base + CLPS711X_INTSR1;
178 clps711x_intc->intmr[0] = clps711x_intc->base + CLPS711X_INTMR1;
179 clps711x_intc->intsr[1] = clps711x_intc->base + CLPS711X_INTSR2;
180 clps711x_intc->intmr[1] = clps711x_intc->base + CLPS711X_INTMR2;
181 clps711x_intc->intsr[2] = clps711x_intc->base + CLPS711X_INTSR3;
182 clps711x_intc->intmr[2] = clps711x_intc->base + CLPS711X_INTMR3;
183
184 /* Mask all interrupts */
185 writel_relaxed(0, clps711x_intc->intmr[0]);
186 writel_relaxed(0, clps711x_intc->intmr[1]);
187 writel_relaxed(0, clps711x_intc->intmr[2]);
188
189 err = irq_alloc_descs(-1, 0, ARRAY_SIZE(clps711x_irqs), numa_node_id());
190 if (IS_ERR_VALUE(err))
191 goto out_iounmap;
192
193 clps711x_intc->ops.map = clps711x_intc_irq_map;
194 clps711x_intc->ops.xlate = irq_domain_xlate_onecell;
195 clps711x_intc->domain =
196 irq_domain_add_legacy(np, ARRAY_SIZE(clps711x_irqs),
197 0, 0, &clps711x_intc->ops, NULL);
198 if (!clps711x_intc->domain) {
199 err = -ENOMEM;
200 goto out_irqfree;
201 }
202
203 irq_set_default_host(clps711x_intc->domain);
204 set_handle_irq(clps711x_irqh);
205
206#ifdef CONFIG_FIQ
207 init_FIQ(0);
208#endif
209
210 return 0;
211
212out_irqfree:
213 irq_free_descs(0, ARRAY_SIZE(clps711x_irqs));
214
215out_iounmap:
216 iounmap(clps711x_intc->base);
217
218out_kfree:
219 kfree(clps711x_intc);
220
221 return err;
222}
223
224void __init clps711x_intc_init(phys_addr_t base, resource_size_t size)
225{
226 BUG_ON(_clps711x_intc_init(NULL, base, size));
227}
228
229#ifdef CONFIG_IRQCHIP
230static int __init clps711x_intc_init_dt(struct device_node *np,
231 struct device_node *parent)
232{
233 struct resource res;
234 int err;
235
236 err = of_address_to_resource(np, 0, &res);
237 if (err)
238 return err;
239
240 return _clps711x_intc_init(np, res.start, resource_size(&res));
241}
242IRQCHIP_DECLARE(clps711x, "cirrus,clps711x-intc", clps711x_intc_init_dt);
243#endif