1/*
2 * Atmel AT91 common AIC (Advanced Interrupt Controller) code shared by
3 * irq-atmel-aic and irq-atmel-aic5 drivers
4 *
5 * Copyright (C) 2004 SAN People
6 * Copyright (C) 2004 ATMEL
7 * Copyright (C) Rick Bronson
8 * Copyright (C) 2014 Free Electrons
9 *
10 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
11 *
12 * This file is licensed under the terms of the GNU General Public
13 * License version 2. This program is licensed "as is" without any
14 * warranty of any kind, whether express or implied.
15 */
16
17#include <linux/errno.h>
18#include <linux/io.h>
19#include <linux/irq.h>
20#include <linux/irqdomain.h>
21#include <linux/of.h>
22#include <linux/of_address.h>
23#include <linux/slab.h>
24
25#include "irq-atmel-aic-common.h"
26
27#define AT91_AIC_PRIOR GENMASK(2, 0)
28#define AT91_AIC_IRQ_MIN_PRIORITY 0
29#define AT91_AIC_IRQ_MAX_PRIORITY 7
30
31#define AT91_AIC_SRCTYPE GENMASK(6, 5)
32#define AT91_AIC_SRCTYPE_LOW (0 << 5)
33#define AT91_AIC_SRCTYPE_FALLING (1 << 5)
34#define AT91_AIC_SRCTYPE_HIGH (2 << 5)
35#define AT91_AIC_SRCTYPE_RISING (3 << 5)
36
37struct aic_chip_data {
38 u32 ext_irqs;
39};
40
41static void aic_common_shutdown(struct irq_data *d)
42{
43 struct irq_chip_type *ct = irq_data_get_chip_type(d);
44
45 ct->chip.irq_mask(d);
46}
47
48int aic_common_set_type(struct irq_data *d, unsigned type, unsigned *val)
49{
50 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
51 struct aic_chip_data *aic = gc->private;
52 unsigned aic_type;
53
54 switch (type) {
55 case IRQ_TYPE_LEVEL_HIGH:
56 aic_type = AT91_AIC_SRCTYPE_HIGH;
57 break;
58 case IRQ_TYPE_EDGE_RISING:
59 aic_type = AT91_AIC_SRCTYPE_RISING;
60 break;
61 case IRQ_TYPE_LEVEL_LOW:
62 if (!(d->mask & aic->ext_irqs))
63 return -EINVAL;
64
65 aic_type = AT91_AIC_SRCTYPE_LOW;
66 break;
67 case IRQ_TYPE_EDGE_FALLING:
68 if (!(d->mask & aic->ext_irqs))
69 return -EINVAL;
70
71 aic_type = AT91_AIC_SRCTYPE_FALLING;
72 break;
73 default:
74 return -EINVAL;
75 }
76
77 *val &= ~AT91_AIC_SRCTYPE;
78 *val |= aic_type;
79
80 return 0;
81}
82
83void aic_common_set_priority(int priority, unsigned *val)
84{
85 *val &= ~AT91_AIC_PRIOR;
86 *val |= priority;
87}
88
89int aic_common_irq_domain_xlate(struct irq_domain *d,
90 struct device_node *ctrlr,
91 const u32 *intspec,
92 unsigned int intsize,
93 irq_hw_number_t *out_hwirq,
94 unsigned int *out_type)
95{
96 if (WARN_ON(intsize < 3))
97 return -EINVAL;
98
99 if (WARN_ON((intspec[2] < AT91_AIC_IRQ_MIN_PRIORITY) ||
100 (intspec[2] > AT91_AIC_IRQ_MAX_PRIORITY)))
101 return -EINVAL;
102
103 *out_hwirq = intspec[0];
104 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
105
106 return 0;
107}
108
109static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
110{
111 struct device_node *node = irq_domain_get_of_node(d: domain);
112 struct irq_chip_generic *gc;
113 struct aic_chip_data *aic;
114 u32 hwirq;
115
116 gc = irq_get_domain_generic_chip(d: domain, hw_irq: 0);
117
118 aic = gc->private;
119 aic->ext_irqs |= 1;
120
121 of_property_for_each_u32(node, "atmel,external-irqs", hwirq) {
122 gc = irq_get_domain_generic_chip(d: domain, hw_irq: hwirq);
123 if (!gc) {
124 pr_warn("AIC: external irq %d >= %d skip it\n",
125 hwirq, domain->revmap_size);
126 continue;
127 }
128
129 aic = gc->private;
130 aic->ext_irqs |= (1 << (hwirq % 32));
131 }
132}
133
134#define AT91_RTC_IDR 0x24
135#define AT91_RTC_IMR 0x28
136#define AT91_RTC_IRQ_MASK 0x1f
137
138void __init aic_common_rtc_irq_fixup(void)
139{
140 struct device_node *np;
141 void __iomem *regs;
142
143 np = of_find_compatible_node(NULL, NULL, compat: "atmel,at91rm9200-rtc");
144 if (!np)
145 np = of_find_compatible_node(NULL, NULL,
146 compat: "atmel,at91sam9x5-rtc");
147
148 if (!np)
149 return;
150
151 regs = of_iomap(node: np, index: 0);
152 of_node_put(node: np);
153
154 if (!regs)
155 return;
156
157 writel(AT91_RTC_IRQ_MASK, addr: regs + AT91_RTC_IDR);
158
159 iounmap(addr: regs);
160}
161
162#define AT91_RTT_MR 0x00 /* Real-time Mode Register */
163#define AT91_RTT_ALMIEN (1 << 16) /* Alarm Interrupt Enable */
164#define AT91_RTT_RTTINCIEN (1 << 17) /* Real Time Timer Increment Interrupt Enable */
165
166void __init aic_common_rtt_irq_fixup(void)
167{
168 struct device_node *np;
169 void __iomem *regs;
170
171 /*
172 * The at91sam9263 SoC has 2 instances of the RTT block, hence we
173 * iterate over the DT to find each occurrence.
174 */
175 for_each_compatible_node(np, NULL, "atmel,at91sam9260-rtt") {
176 regs = of_iomap(node: np, index: 0);
177 if (!regs)
178 continue;
179
180 writel(readl(addr: regs + AT91_RTT_MR) &
181 ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN),
182 addr: regs + AT91_RTT_MR);
183
184 iounmap(addr: regs);
185 }
186}
187
188static void __init aic_common_irq_fixup(const struct of_device_id *matches)
189{
190 void (*fixup)(void);
191
192 fixup = of_machine_get_match_data(matches);
193 if (fixup)
194 fixup();
195}
196
197struct irq_domain *__init aic_common_of_init(struct device_node *node,
198 const struct irq_domain_ops *ops,
199 const char *name, int nirqs,
200 const struct of_device_id *matches)
201{
202 struct irq_chip_generic *gc;
203 struct irq_domain *domain;
204 struct aic_chip_data *aic;
205 void __iomem *reg_base;
206 int nchips;
207 int ret;
208 int i;
209
210 nchips = DIV_ROUND_UP(nirqs, 32);
211
212 reg_base = of_iomap(node, index: 0);
213 if (!reg_base)
214 return ERR_PTR(error: -ENOMEM);
215
216 aic = kcalloc(nchips, sizeof(*aic), GFP_KERNEL);
217 if (!aic) {
218 ret = -ENOMEM;
219 goto err_iounmap;
220 }
221
222 domain = irq_domain_create_linear(of_fwnode_handle(node), size: nchips * 32, ops, host_data: aic);
223 if (!domain) {
224 ret = -ENOMEM;
225 goto err_free_aic;
226 }
227
228 ret = irq_alloc_domain_generic_chips(domain, 32, 1, name,
229 handle_fasteoi_irq,
230 IRQ_NOREQUEST | IRQ_NOPROBE |
231 IRQ_NOAUTOEN, 0, 0);
232 if (ret)
233 goto err_domain_remove;
234
235 for (i = 0; i < nchips; i++) {
236 gc = irq_get_domain_generic_chip(d: domain, hw_irq: i * 32);
237
238 gc->reg_base = reg_base;
239
240 gc->unused = 0;
241 gc->wake_enabled = ~0;
242 gc->chip_types[0].type = IRQ_TYPE_SENSE_MASK;
243 gc->chip_types[0].chip.irq_eoi = irq_gc_eoi;
244 gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
245 gc->chip_types[0].chip.irq_shutdown = aic_common_shutdown;
246 gc->private = &aic[i];
247 }
248
249 aic_common_ext_irq_of_init(domain);
250 aic_common_irq_fixup(matches);
251
252 return domain;
253
254err_domain_remove:
255 irq_domain_remove(domain);
256
257err_free_aic:
258 kfree(objp: aic);
259
260err_iounmap:
261 iounmap(addr: reg_base);
262
263 return ERR_PTR(error: ret);
264}
265

source code of linux/drivers/irqchip/irq-atmel-aic-common.c