tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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/irqchip.h>
15#include <linux/irqdomain.h>
16#include <linux/of_address.h>
17#include <linux/of_irq.h>
18#include <linux/slab.h>
19
20#include <asm/exception.h>
21#include <asm/mach/irq.h>
22
23#define CLPS711X_INTSR1 (0x0240)
24#define CLPS711X_INTMR1 (0x0280)
25#define CLPS711X_BLEOI (0x0600)
26#define CLPS711X_MCEOI (0x0640)
27#define CLPS711X_TEOI (0x0680)
28#define CLPS711X_TC1EOI (0x06c0)
29#define CLPS711X_TC2EOI (0x0700)
30#define CLPS711X_RTCEOI (0x0740)
31#define CLPS711X_UMSEOI (0x0780)
32#define CLPS711X_COEOI (0x07c0)
33#define CLPS711X_INTSR2 (0x1240)
34#define CLPS711X_INTMR2 (0x1280)
35#define CLPS711X_SRXEOF (0x1600)
36#define CLPS711X_KBDEOI (0x1700)
37#define CLPS711X_INTSR3 (0x2240)
38#define CLPS711X_INTMR3 (0x2280)
39
40static const struct {
41#define CLPS711X_FLAG_EN (1 << 0)
42#define CLPS711X_FLAG_FIQ (1 << 1)
43 unsigned int flags;
44 phys_addr_t eoi;
45} clps711x_irqs[] = {
46 [1] = { CLPS711X_FLAG_FIQ, CLPS711X_BLEOI, },
47 [3] = { CLPS711X_FLAG_FIQ, CLPS711X_MCEOI, },
48 [4] = { CLPS711X_FLAG_EN, CLPS711X_COEOI, },
49 [5] = { CLPS711X_FLAG_EN, },
50 [6] = { CLPS711X_FLAG_EN, },
51 [7] = { CLPS711X_FLAG_EN, },
52 [8] = { CLPS711X_FLAG_EN, CLPS711X_TC1EOI, },
53 [9] = { CLPS711X_FLAG_EN, CLPS711X_TC2EOI, },
54 [10] = { CLPS711X_FLAG_EN, CLPS711X_RTCEOI, },
55 [11] = { CLPS711X_FLAG_EN, CLPS711X_TEOI, },
56 [12] = { CLPS711X_FLAG_EN, },
57 [13] = { CLPS711X_FLAG_EN, },
58 [14] = { CLPS711X_FLAG_EN, CLPS711X_UMSEOI, },
59 [15] = { CLPS711X_FLAG_EN, CLPS711X_SRXEOF, },
60 [16] = { CLPS711X_FLAG_EN, CLPS711X_KBDEOI, },
61 [17] = { CLPS711X_FLAG_EN, },
62 [18] = { CLPS711X_FLAG_EN, },
63 [28] = { CLPS711X_FLAG_EN, },
64 [29] = { CLPS711X_FLAG_EN, },
65 [32] = { CLPS711X_FLAG_FIQ, },
66};
67
68static struct {
69 void __iomem *base;
70 void __iomem *intmr[3];
71 void __iomem *intsr[3];
72 struct irq_domain *domain;
73 struct irq_domain_ops ops;
74} *clps711x_intc;
75
76static asmlinkage void __exception_irq_entry clps711x_irqh(struct pt_regs *regs)
77{
78 u32 irqstat;
79
80 do {
81 irqstat = readw_relaxed(clps711x_intc->intmr[0]) &
82 readw_relaxed(clps711x_intc->intsr[0]);
83 if (irqstat)
84 handle_domain_irq(clps711x_intc->domain,
85 fls(irqstat) - 1, regs);
86
87 irqstat = readw_relaxed(clps711x_intc->intmr[1]) &
88 readw_relaxed(clps711x_intc->intsr[1]);
89 if (irqstat)
90 handle_domain_irq(clps711x_intc->domain,
91 fls(irqstat) - 1 + 16, regs);
92 } while (irqstat);
93}
94
95static void clps711x_intc_eoi(struct irq_data *d)
96{
97 irq_hw_number_t hwirq = irqd_to_hwirq(d);
98
99 writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hwirq].eoi);
100}
101
102static void clps711x_intc_mask(struct irq_data *d)
103{
104 irq_hw_number_t hwirq = irqd_to_hwirq(d);
105 void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
106 u32 tmp;
107
108 tmp = readl_relaxed(intmr);
109 tmp &= ~(1 << (hwirq % 16));
110 writel_relaxed(tmp, intmr);
111}
112
113static void clps711x_intc_unmask(struct irq_data *d)
114{
115 irq_hw_number_t hwirq = irqd_to_hwirq(d);
116 void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
117 u32 tmp;
118
119 tmp = readl_relaxed(intmr);
120 tmp |= 1 << (hwirq % 16);
121 writel_relaxed(tmp, intmr);
122}
123
124static struct irq_chip clps711x_intc_chip = {
125 .name = "clps711x-intc",
126 .irq_eoi = clps711x_intc_eoi,
127 .irq_mask = clps711x_intc_mask,
128 .irq_unmask = clps711x_intc_unmask,
129};
130
131static int __init clps711x_intc_irq_map(struct irq_domain *h, unsigned int virq,
132 irq_hw_number_t hw)
133{
134 irq_flow_handler_t handler = handle_level_irq;
135 unsigned int flags = 0;
136
137 if (!clps711x_irqs[hw].flags)
138 return 0;
139
140 if (clps711x_irqs[hw].flags & CLPS711X_FLAG_FIQ) {
141 handler = handle_bad_irq;
142 flags |= IRQ_NOAUTOEN;
143 } else if (clps711x_irqs[hw].eoi) {
144 handler = handle_fasteoi_irq;
145 }
146
147 /* Clear down pending interrupt */
148 if (clps711x_irqs[hw].eoi)
149 writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hw].eoi);
150
151 irq_set_chip_and_handler(virq, &clps711x_intc_chip, handler);
152 irq_modify_status(virq, IRQ_NOPROBE, flags);
153
154 return 0;
155}
156
157static int __init _clps711x_intc_init(struct device_node *np,
158 phys_addr_t base, resource_size_t size)
159{
160 int err;
161
162 clps711x_intc = kzalloc(sizeof(*clps711x_intc), GFP_KERNEL);
163 if (!clps711x_intc)
164 return -ENOMEM;
165
166 clps711x_intc->base = ioremap(base, size);
167 if (!clps711x_intc->base) {
168 err = -ENOMEM;
169 goto out_kfree;
170 }
171
172 clps711x_intc->intsr[0] = clps711x_intc->base + CLPS711X_INTSR1;
173 clps711x_intc->intmr[0] = clps711x_intc->base + CLPS711X_INTMR1;
174 clps711x_intc->intsr[1] = clps711x_intc->base + CLPS711X_INTSR2;
175 clps711x_intc->intmr[1] = clps711x_intc->base + CLPS711X_INTMR2;
176 clps711x_intc->intsr[2] = clps711x_intc->base + CLPS711X_INTSR3;
177 clps711x_intc->intmr[2] = clps711x_intc->base + CLPS711X_INTMR3;
178
179 /* Mask all interrupts */
180 writel_relaxed(0, clps711x_intc->intmr[0]);
181 writel_relaxed(0, clps711x_intc->intmr[1]);
182 writel_relaxed(0, clps711x_intc->intmr[2]);
183
184 err = irq_alloc_descs(-1, 0, ARRAY_SIZE(clps711x_irqs), numa_node_id());
185 if (err < 0)
186 goto out_iounmap;
187
188 clps711x_intc->ops.map = clps711x_intc_irq_map;
189 clps711x_intc->ops.xlate = irq_domain_xlate_onecell;
190 clps711x_intc->domain =
191 irq_domain_add_legacy(np, ARRAY_SIZE(clps711x_irqs),
192 0, 0, &clps711x_intc->ops, NULL);
193 if (!clps711x_intc->domain) {
194 err = -ENOMEM;
195 goto out_irqfree;
196 }
197
198 irq_set_default_host(clps711x_intc->domain);
199 set_handle_irq(clps711x_irqh);
200
201#ifdef CONFIG_FIQ
202 init_FIQ(0);
203#endif
204
205 return 0;
206
207out_irqfree:
208 irq_free_descs(0, ARRAY_SIZE(clps711x_irqs));
209
210out_iounmap:
211 iounmap(clps711x_intc->base);
212
213out_kfree:
214 kfree(clps711x_intc);
215
216 return err;
217}
218
219void __init clps711x_intc_init(phys_addr_t base, resource_size_t size)
220{
221 BUG_ON(_clps711x_intc_init(NULL, base, size));
222}
223
224#ifdef CONFIG_IRQCHIP
225static int __init clps711x_intc_init_dt(struct device_node *np,
226 struct device_node *parent)
227{
228 struct resource res;
229 int err;
230
231 err = of_address_to_resource(np, 0, &res);
232 if (err)
233 return err;
234
235 return _clps711x_intc_init(np, res.start, resource_size(&res));
236}
237IRQCHIP_DECLARE(clps711x, "cirrus,ep7209-intc", clps711x_intc_init_dt);
238#endif