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1/*
2 * arch/arm/mach-vt8500/irq.c
3 *
4 * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
5 * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22/*
23 * This file is copied and modified from the original irq.c provided by
24 * Alexey Charkov. Minor changes have been made for Device Tree Support.
25 */
26
27#include <linux/slab.h>
28#include <linux/io.h>
29#include <linux/irq.h>
30#include <linux/irqchip.h>
31#include <linux/irqdomain.h>
32#include <linux/interrupt.h>
33#include <linux/bitops.h>
34
35#include <linux/of.h>
36#include <linux/of_irq.h>
37#include <linux/of_address.h>
38
39#include <asm/irq.h>
40#include <asm/exception.h>
41#include <asm/mach/irq.h>
42
43#define VT8500_ICPC_IRQ 0x20
44#define VT8500_ICPC_FIQ 0x24
45#define VT8500_ICDC 0x40 /* Destination Control 64*u32 */
46#define VT8500_ICIS 0x80 /* Interrupt status, 16*u32 */
47
48/* ICPC */
49#define ICPC_MASK 0x3F
50#define ICPC_ROTATE BIT(6)
51
52/* IC_DCTR */
53#define ICDC_IRQ 0x00
54#define ICDC_FIQ 0x01
55#define ICDC_DSS0 0x02
56#define ICDC_DSS1 0x03
57#define ICDC_DSS2 0x04
58#define ICDC_DSS3 0x05
59#define ICDC_DSS4 0x06
60#define ICDC_DSS5 0x07
61
62#define VT8500_INT_DISABLE 0
63#define VT8500_INT_ENABLE BIT(3)
64
65#define VT8500_TRIGGER_HIGH 0
66#define VT8500_TRIGGER_RISING BIT(5)
67#define VT8500_TRIGGER_FALLING BIT(6)
68#define VT8500_EDGE ( VT8500_TRIGGER_RISING \
69 | VT8500_TRIGGER_FALLING)
70
71/* vt8500 has 1 intc, wm8505 and wm8650 have 2 */
72#define VT8500_INTC_MAX 2
73
74struct vt8500_irq_data {
75 void __iomem *base; /* IO Memory base address */
76 struct irq_domain *domain; /* Domain for this controller */
77};
78
79/* Global variable for accessing io-mem addresses */
80static struct vt8500_irq_data intc[VT8500_INTC_MAX];
81static u32 active_cnt = 0;
82
83static void vt8500_irq_mask(struct irq_data *d)
84{
85 struct vt8500_irq_data *priv = d->domain->host_data;
86 void __iomem *base = priv->base;
87 void __iomem *stat_reg = base + VT8500_ICIS + (d->hwirq < 32 ? 0 : 4);
88 u8 edge, dctr;
89 u32 status;
90
91 edge = readb(base + VT8500_ICDC + d->hwirq) & VT8500_EDGE;
92 if (edge) {
93 status = readl(stat_reg);
94
95 status |= (1 << (d->hwirq & 0x1f));
96 writel(status, stat_reg);
97 } else {
98 dctr = readb(base + VT8500_ICDC + d->hwirq);
99 dctr &= ~VT8500_INT_ENABLE;
100 writeb(dctr, base + VT8500_ICDC + d->hwirq);
101 }
102}
103
104static void vt8500_irq_unmask(struct irq_data *d)
105{
106 struct vt8500_irq_data *priv = d->domain->host_data;
107 void __iomem *base = priv->base;
108 u8 dctr;
109
110 dctr = readb(base + VT8500_ICDC + d->hwirq);
111 dctr |= VT8500_INT_ENABLE;
112 writeb(dctr, base + VT8500_ICDC + d->hwirq);
113}
114
115static int vt8500_irq_set_type(struct irq_data *d, unsigned int flow_type)
116{
117 struct vt8500_irq_data *priv = d->domain->host_data;
118 void __iomem *base = priv->base;
119 u8 dctr;
120
121 dctr = readb(base + VT8500_ICDC + d->hwirq);
122 dctr &= ~VT8500_EDGE;
123
124 switch (flow_type) {
125 case IRQF_TRIGGER_LOW:
126 return -EINVAL;
127 case IRQF_TRIGGER_HIGH:
128 dctr |= VT8500_TRIGGER_HIGH;
129 irq_set_handler_locked(d, handle_level_irq);
130 break;
131 case IRQF_TRIGGER_FALLING:
132 dctr |= VT8500_TRIGGER_FALLING;
133 irq_set_handler_locked(d, handle_edge_irq);
134 break;
135 case IRQF_TRIGGER_RISING:
136 dctr |= VT8500_TRIGGER_RISING;
137 irq_set_handler_locked(d, handle_edge_irq);
138 break;
139 }
140 writeb(dctr, base + VT8500_ICDC + d->hwirq);
141
142 return 0;
143}
144
145static struct irq_chip vt8500_irq_chip = {
146 .name = "vt8500",
147 .irq_ack = vt8500_irq_mask,
148 .irq_mask = vt8500_irq_mask,
149 .irq_unmask = vt8500_irq_unmask,
150 .irq_set_type = vt8500_irq_set_type,
151};
152
153static void __init vt8500_init_irq_hw(void __iomem *base)
154{
155 u32 i;
156
157 /* Enable rotating priority for IRQ */
158 writel(ICPC_ROTATE, base + VT8500_ICPC_IRQ);
159 writel(0x00, base + VT8500_ICPC_FIQ);
160
161 /* Disable all interrupts and route them to IRQ */
162 for (i = 0; i < 64; i++)
163 writeb(VT8500_INT_DISABLE | ICDC_IRQ, base + VT8500_ICDC + i);
164}
165
166static int vt8500_irq_map(struct irq_domain *h, unsigned int virq,
167 irq_hw_number_t hw)
168{
169 irq_set_chip_and_handler(virq, &vt8500_irq_chip, handle_level_irq);
170
171 return 0;
172}
173
174static const struct irq_domain_ops vt8500_irq_domain_ops = {
175 .map = vt8500_irq_map,
176 .xlate = irq_domain_xlate_onecell,
177};
178
179static void __exception_irq_entry vt8500_handle_irq(struct pt_regs *regs)
180{
181 u32 stat, i;
182 int irqnr;
183 void __iomem *base;
184
185 /* Loop through each active controller */
186 for (i=0; i<active_cnt; i++) {
187 base = intc[i].base;
188 irqnr = readl_relaxed(base) & 0x3F;
189 /*
190 Highest Priority register default = 63, so check that this
191 is a real interrupt by checking the status register
192 */
193 if (irqnr == 63) {
194 stat = readl_relaxed(base + VT8500_ICIS + 4);
195 if (!(stat & BIT(31)))
196 continue;
197 }
198
199 handle_domain_irq(intc[i].domain, irqnr, regs);
200 }
201}
202
203static int __init vt8500_irq_init(struct device_node *node,
204 struct device_node *parent)
205{
206 int irq, i;
207 struct device_node *np = node;
208
209 if (active_cnt == VT8500_INTC_MAX) {
210 pr_err("%s: Interrupt controllers > VT8500_INTC_MAX\n",
211 __func__);
212 goto out;
213 }
214
215 intc[active_cnt].base = of_iomap(np, 0);
216 intc[active_cnt].domain = irq_domain_add_linear(node, 64,
217 &vt8500_irq_domain_ops, &intc[active_cnt]);
218
219 if (!intc[active_cnt].base) {
220 pr_err("%s: Unable to map IO memory\n", __func__);
221 goto out;
222 }
223
224 if (!intc[active_cnt].domain) {
225 pr_err("%s: Unable to add irq domain!\n", __func__);
226 goto out;
227 }
228
229 set_handle_irq(vt8500_handle_irq);
230
231 vt8500_init_irq_hw(intc[active_cnt].base);
232
233 pr_info("vt8500-irq: Added interrupt controller\n");
234
235 active_cnt++;
236
237 /* check if this is a slaved controller */
238 if (of_irq_count(np) != 0) {
239 /* check that we have the correct number of interrupts */
240 if (of_irq_count(np) != 8) {
241 pr_err("%s: Incorrect IRQ map for slaved controller\n",
242 __func__);
243 return -EINVAL;
244 }
245
246 for (i = 0; i < 8; i++) {
247 irq = irq_of_parse_and_map(np, i);
248 enable_irq(irq);
249 }
250
251 pr_info("vt8500-irq: Enabled slave->parent interrupts\n");
252 }
253out:
254 return 0;
255}
256
257IRQCHIP_DECLARE(vt8500_irq, "via,vt8500-intc", vt8500_irq_init);
258

Warning: That file was not part of the compilation database. It may have many parsing errors.