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irqchip: atmel-aic: Add atmel AIC/AIC5 drivers
[karo-tx-linux.git] / drivers / irqchip / irq-atmel-aic-common.c
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(7, 6)
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
37 struct aic_chip_data {
38         u32 ext_irqs;
39 };
40
41 static 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
48 int 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
83 int aic_common_set_priority(int priority, unsigned *val)
84 {
85         if (priority < AT91_AIC_IRQ_MIN_PRIORITY ||
86             priority > AT91_AIC_IRQ_MAX_PRIORITY)
87                 return -EINVAL;
88
89         *val &= AT91_AIC_PRIOR;
90         *val |= priority;
91
92         return 0;
93 }
94
95 int aic_common_irq_domain_xlate(struct irq_domain *d,
96                                 struct device_node *ctrlr,
97                                 const u32 *intspec,
98                                 unsigned int intsize,
99                                 irq_hw_number_t *out_hwirq,
100                                 unsigned int *out_type)
101 {
102         if (WARN_ON(intsize < 3))
103                 return -EINVAL;
104
105         if (WARN_ON((intspec[2] < AT91_AIC_IRQ_MIN_PRIORITY) ||
106                     (intspec[2] > AT91_AIC_IRQ_MAX_PRIORITY)))
107                 return -EINVAL;
108
109         *out_hwirq = intspec[0];
110         *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
111
112         return 0;
113 }
114
115 static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
116 {
117         struct device_node *node = domain->of_node;
118         struct irq_chip_generic *gc;
119         struct aic_chip_data *aic;
120         struct property *prop;
121         const __be32 *p;
122         u32 hwirq;
123
124         gc = irq_get_domain_generic_chip(domain, 0);
125
126         aic = gc->private;
127         aic->ext_irqs |= 1;
128
129         of_property_for_each_u32(node, "atmel,external-irqs", prop, p, hwirq) {
130                 gc = irq_get_domain_generic_chip(domain, hwirq);
131                 if (!gc) {
132                         pr_warn("AIC: external irq %d >= %d skip it\n",
133                                 hwirq, domain->revmap_size);
134                         continue;
135                 }
136
137                 aic = gc->private;
138                 aic->ext_irqs |= (1 << (hwirq % 32));
139         }
140 }
141
142 struct irq_domain *__init aic_common_of_init(struct device_node *node,
143                                              const struct irq_domain_ops *ops,
144                                              const char *name, int nirqs)
145 {
146         struct irq_chip_generic *gc;
147         struct irq_domain *domain;
148         struct aic_chip_data *aic;
149         void __iomem *reg_base;
150         int nchips;
151         int ret;
152         int i;
153
154         nchips = DIV_ROUND_UP(nirqs, 32);
155
156         reg_base = of_iomap(node, 0);
157         if (!reg_base)
158                 return ERR_PTR(-ENOMEM);
159
160         aic = kcalloc(nchips, sizeof(*aic), GFP_KERNEL);
161         if (!aic) {
162                 ret = -ENOMEM;
163                 goto err_iounmap;
164         }
165
166         domain = irq_domain_add_linear(node, nchips * 32, ops, aic);
167         if (!domain) {
168                 ret = -ENOMEM;
169                 goto err_free_aic;
170         }
171
172         ret = irq_alloc_domain_generic_chips(domain, 32, 1, name,
173                                              handle_level_irq, 0, 0,
174                                              IRQCHIP_SKIP_SET_WAKE);
175         if (ret)
176                 goto err_domain_remove;
177
178         for (i = 0; i < nchips; i++) {
179                 gc = irq_get_domain_generic_chip(domain, i * 32);
180
181                 gc->reg_base = reg_base;
182
183                 gc->unused = 0;
184                 gc->wake_enabled = ~0;
185                 gc->chip_types[0].type = IRQ_TYPE_SENSE_MASK;
186                 gc->chip_types[0].handler = handle_fasteoi_irq;
187                 gc->chip_types[0].chip.irq_eoi = irq_gc_eoi;
188                 gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
189                 gc->chip_types[0].chip.irq_shutdown = aic_common_shutdown;
190                 gc->private = &aic[i];
191         }
192
193         aic_common_ext_irq_of_init(domain);
194
195         return domain;
196
197 err_domain_remove:
198         irq_domain_remove(domain);
199
200 err_free_aic:
201         kfree(aic);
202
203 err_iounmap:
204         iounmap(reg_base);
205
206         return ERR_PTR(ret);
207 }