2 * Atmel AT91 common AIC (Advanced Interrupt Controller) code shared by
3 * irq-atmel-aic and irq-atmel-aic5 drivers
5 * Copyright (C) 2004 SAN People
6 * Copyright (C) 2004 ATMEL
7 * Copyright (C) Rick Bronson
8 * Copyright (C) 2014 Free Electrons
10 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
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.
17 #include <linux/errno.h>
19 #include <linux/irq.h>
20 #include <linux/irqdomain.h>
22 #include <linux/of_address.h>
23 #include <linux/slab.h>
25 #include "irq-atmel-aic-common.h"
27 #define AT91_AIC_PRIOR GENMASK(2, 0)
28 #define AT91_AIC_IRQ_MIN_PRIORITY 0
29 #define AT91_AIC_IRQ_MAX_PRIORITY 7
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)
37 struct aic_chip_data {
41 static void aic_common_shutdown(struct irq_data *d)
43 struct irq_chip_type *ct = irq_data_get_chip_type(d);
48 int aic_common_set_type(struct irq_data *d, unsigned type, unsigned *val)
50 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
51 struct aic_chip_data *aic = gc->private;
55 case IRQ_TYPE_LEVEL_HIGH:
56 aic_type = AT91_AIC_SRCTYPE_HIGH;
58 case IRQ_TYPE_EDGE_RISING:
59 aic_type = AT91_AIC_SRCTYPE_RISING;
61 case IRQ_TYPE_LEVEL_LOW:
62 if (!(d->mask & aic->ext_irqs))
65 aic_type = AT91_AIC_SRCTYPE_LOW;
67 case IRQ_TYPE_EDGE_FALLING:
68 if (!(d->mask & aic->ext_irqs))
71 aic_type = AT91_AIC_SRCTYPE_FALLING;
77 *val &= ~AT91_AIC_SRCTYPE;
83 void aic_common_set_priority(int priority, unsigned *val)
85 *val &= ~AT91_AIC_PRIOR;
89 int aic_common_irq_domain_xlate(struct irq_domain *d,
90 struct device_node *ctrlr,
93 irq_hw_number_t *out_hwirq,
94 unsigned int *out_type)
96 if (WARN_ON(intsize < 3))
99 if (WARN_ON((intspec[2] < AT91_AIC_IRQ_MIN_PRIORITY) ||
100 (intspec[2] > AT91_AIC_IRQ_MAX_PRIORITY)))
103 *out_hwirq = intspec[0];
104 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
109 static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
111 struct device_node *node = irq_domain_get_of_node(domain);
112 struct irq_chip_generic *gc;
113 struct aic_chip_data *aic;
114 struct property *prop;
118 gc = irq_get_domain_generic_chip(domain, 0);
123 of_property_for_each_u32(node, "atmel,external-irqs", prop, p, hwirq) {
124 gc = irq_get_domain_generic_chip(domain, hwirq);
126 pr_warn("AIC: external irq %d >= %d skip it\n",
127 hwirq, domain->revmap_size);
132 aic->ext_irqs |= (1 << (hwirq % 32));
136 #define AT91_RTC_IDR 0x24
137 #define AT91_RTC_IMR 0x28
138 #define AT91_RTC_IRQ_MASK 0x1f
140 void __init aic_common_rtc_irq_fixup(void)
142 struct device_node *np;
145 np = of_find_compatible_node(NULL, NULL, "atmel,at91rm9200-rtc");
147 np = of_find_compatible_node(NULL, NULL,
148 "atmel,at91sam9x5-rtc");
153 regs = of_iomap(np, 0);
159 writel(AT91_RTC_IRQ_MASK, regs + AT91_RTC_IDR);
164 #define AT91_RTT_MR 0x00 /* Real-time Mode Register */
165 #define AT91_RTT_ALMIEN (1 << 16) /* Alarm Interrupt Enable */
166 #define AT91_RTT_RTTINCIEN (1 << 17) /* Real Time Timer Increment Interrupt Enable */
168 void __init aic_common_rtt_irq_fixup(void)
170 struct device_node *np;
174 * The at91sam9263 SoC has 2 instances of the RTT block, hence we
175 * iterate over the DT to find each occurrence.
177 for_each_compatible_node(np, NULL, "atmel,at91sam9260-rtt") {
178 regs = of_iomap(np, 0);
182 writel(readl(regs + AT91_RTT_MR) &
183 ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN),
190 static void __init aic_common_irq_fixup(const struct of_device_id *matches)
192 struct device_node *root = of_find_node_by_path("/");
193 const struct of_device_id *match;
198 match = of_match_node(matches, root);
201 void (*fixup)(void) = match->data;
208 struct irq_domain *__init aic_common_of_init(struct device_node *node,
209 const struct irq_domain_ops *ops,
210 const char *name, int nirqs,
211 const struct of_device_id *matches)
213 struct irq_chip_generic *gc;
214 struct irq_domain *domain;
215 struct aic_chip_data *aic;
216 void __iomem *reg_base;
221 nchips = DIV_ROUND_UP(nirqs, 32);
223 reg_base = of_iomap(node, 0);
225 return ERR_PTR(-ENOMEM);
227 aic = kcalloc(nchips, sizeof(*aic), GFP_KERNEL);
233 domain = irq_domain_add_linear(node, nchips * 32, ops, aic);
239 ret = irq_alloc_domain_generic_chips(domain, 32, 1, name,
241 IRQ_NOREQUEST | IRQ_NOPROBE |
244 goto err_domain_remove;
246 for (i = 0; i < nchips; i++) {
247 gc = irq_get_domain_generic_chip(domain, i * 32);
249 gc->reg_base = reg_base;
252 gc->wake_enabled = ~0;
253 gc->chip_types[0].type = IRQ_TYPE_SENSE_MASK;
254 gc->chip_types[0].chip.irq_eoi = irq_gc_eoi;
255 gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
256 gc->chip_types[0].chip.irq_shutdown = aic_common_shutdown;
257 gc->private = &aic[i];
260 aic_common_ext_irq_of_init(domain);
261 aic_common_irq_fixup(matches);
266 irq_domain_remove(domain);