Merge tag 'mlx5-fixes-2018-06-26' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / drivers / irqchip / irq-keystone.c
1 /*
2  * Texas Instruments Keystone IRQ controller IP driver
3  *
4  * Copyright (C) 2014 Texas Instruments, Inc.
5  * Author: Sajesh Kumar Saran <sajesh@ti.com>
6  *         Grygorii Strashko <grygorii.strashko@ti.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation version 2.
11  *
12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13  * kind, whether express or implied; without even the implied warranty
14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  */
17
18 #include <linux/irq.h>
19 #include <linux/bitops.h>
20 #include <linux/module.h>
21 #include <linux/moduleparam.h>
22 #include <linux/interrupt.h>
23 #include <linux/irqdomain.h>
24 #include <linux/irqchip.h>
25 #include <linux/of.h>
26 #include <linux/of_platform.h>
27 #include <linux/mfd/syscon.h>
28 #include <linux/regmap.h>
29
30 /* The source ID bits start from 4 to 31 (total 28 bits)*/
31 #define BIT_OFS                 4
32 #define KEYSTONE_N_IRQ          (32 - BIT_OFS)
33
34 struct keystone_irq_device {
35         struct device           *dev;
36         struct irq_chip          chip;
37         u32                      mask;
38         int                      irq;
39         struct irq_domain       *irqd;
40         struct regmap           *devctrl_regs;
41         u32                     devctrl_offset;
42         raw_spinlock_t          wa_lock;
43 };
44
45 static inline u32 keystone_irq_readl(struct keystone_irq_device *kirq)
46 {
47         int ret;
48         u32 val = 0;
49
50         ret = regmap_read(kirq->devctrl_regs, kirq->devctrl_offset, &val);
51         if (ret < 0)
52                 dev_dbg(kirq->dev, "irq read failed ret(%d)\n", ret);
53         return val;
54 }
55
56 static inline void
57 keystone_irq_writel(struct keystone_irq_device *kirq, u32 value)
58 {
59         int ret;
60
61         ret = regmap_write(kirq->devctrl_regs, kirq->devctrl_offset, value);
62         if (ret < 0)
63                 dev_dbg(kirq->dev, "irq write failed ret(%d)\n", ret);
64 }
65
66 static void keystone_irq_setmask(struct irq_data *d)
67 {
68         struct keystone_irq_device *kirq = irq_data_get_irq_chip_data(d);
69
70         kirq->mask |= BIT(d->hwirq);
71         dev_dbg(kirq->dev, "mask %lu [%x]\n", d->hwirq, kirq->mask);
72 }
73
74 static void keystone_irq_unmask(struct irq_data *d)
75 {
76         struct keystone_irq_device *kirq = irq_data_get_irq_chip_data(d);
77
78         kirq->mask &= ~BIT(d->hwirq);
79         dev_dbg(kirq->dev, "unmask %lu [%x]\n", d->hwirq, kirq->mask);
80 }
81
82 static void keystone_irq_ack(struct irq_data *d)
83 {
84         /* nothing to do here */
85 }
86
87 static irqreturn_t keystone_irq_handler(int irq, void *keystone_irq)
88 {
89         struct keystone_irq_device *kirq = keystone_irq;
90         unsigned long wa_lock_flags;
91         unsigned long pending;
92         int src, virq;
93
94         dev_dbg(kirq->dev, "start irq %d\n", irq);
95
96         pending = keystone_irq_readl(kirq);
97         keystone_irq_writel(kirq, pending);
98
99         dev_dbg(kirq->dev, "pending 0x%lx, mask 0x%x\n", pending, kirq->mask);
100
101         pending = (pending >> BIT_OFS) & ~kirq->mask;
102
103         dev_dbg(kirq->dev, "pending after mask 0x%lx\n", pending);
104
105         for (src = 0; src < KEYSTONE_N_IRQ; src++) {
106                 if (BIT(src) & pending) {
107                         virq = irq_find_mapping(kirq->irqd, src);
108                         dev_dbg(kirq->dev, "dispatch bit %d, virq %d\n",
109                                 src, virq);
110                         if (!virq)
111                                 dev_warn(kirq->dev, "spurious irq detected hwirq %d, virq %d\n",
112                                          src, virq);
113                         raw_spin_lock_irqsave(&kirq->wa_lock, wa_lock_flags);
114                         generic_handle_irq(virq);
115                         raw_spin_unlock_irqrestore(&kirq->wa_lock,
116                                                    wa_lock_flags);
117                 }
118         }
119
120         dev_dbg(kirq->dev, "end irq %d\n", irq);
121         return IRQ_HANDLED;
122 }
123
124 static int keystone_irq_map(struct irq_domain *h, unsigned int virq,
125                                 irq_hw_number_t hw)
126 {
127         struct keystone_irq_device *kirq = h->host_data;
128
129         irq_set_chip_data(virq, kirq);
130         irq_set_chip_and_handler(virq, &kirq->chip, handle_level_irq);
131         irq_set_probe(virq);
132         return 0;
133 }
134
135 static const struct irq_domain_ops keystone_irq_ops = {
136         .map    = keystone_irq_map,
137         .xlate  = irq_domain_xlate_onecell,
138 };
139
140 static int keystone_irq_probe(struct platform_device *pdev)
141 {
142         struct device *dev = &pdev->dev;
143         struct device_node *np = dev->of_node;
144         struct keystone_irq_device *kirq;
145         int ret;
146
147         if (np == NULL)
148                 return -EINVAL;
149
150         kirq = devm_kzalloc(dev, sizeof(*kirq), GFP_KERNEL);
151         if (!kirq)
152                 return -ENOMEM;
153
154         kirq->devctrl_regs =
155                 syscon_regmap_lookup_by_phandle(np, "ti,syscon-dev");
156         if (IS_ERR(kirq->devctrl_regs))
157                 return PTR_ERR(kirq->devctrl_regs);
158
159         ret = of_property_read_u32_index(np, "ti,syscon-dev", 1,
160                                          &kirq->devctrl_offset);
161         if (ret) {
162                 dev_err(dev, "couldn't read the devctrl_offset offset!\n");
163                 return ret;
164         }
165
166         kirq->irq = platform_get_irq(pdev, 0);
167         if (kirq->irq < 0) {
168                 dev_err(dev, "no irq resource %d\n", kirq->irq);
169                 return kirq->irq;
170         }
171
172         kirq->dev = dev;
173         kirq->mask = ~0x0;
174         kirq->chip.name         = "keystone-irq";
175         kirq->chip.irq_ack      = keystone_irq_ack;
176         kirq->chip.irq_mask     = keystone_irq_setmask;
177         kirq->chip.irq_unmask   = keystone_irq_unmask;
178
179         kirq->irqd = irq_domain_add_linear(np, KEYSTONE_N_IRQ,
180                                            &keystone_irq_ops, kirq);
181         if (!kirq->irqd) {
182                 dev_err(dev, "IRQ domain registration failed\n");
183                 return -ENODEV;
184         }
185
186         raw_spin_lock_init(&kirq->wa_lock);
187
188         platform_set_drvdata(pdev, kirq);
189
190         ret = request_irq(kirq->irq, keystone_irq_handler,
191                           0, dev_name(dev), kirq);
192         if (ret) {
193                 irq_domain_remove(kirq->irqd);
194                 return ret;
195         }
196
197         /* clear all source bits */
198         keystone_irq_writel(kirq, ~0x0);
199
200         dev_info(dev, "irqchip registered, nr_irqs %u\n", KEYSTONE_N_IRQ);
201
202         return 0;
203 }
204
205 static int keystone_irq_remove(struct platform_device *pdev)
206 {
207         struct keystone_irq_device *kirq = platform_get_drvdata(pdev);
208         int hwirq;
209
210         free_irq(kirq->irq, kirq);
211
212         for (hwirq = 0; hwirq < KEYSTONE_N_IRQ; hwirq++)
213                 irq_dispose_mapping(irq_find_mapping(kirq->irqd, hwirq));
214
215         irq_domain_remove(kirq->irqd);
216         return 0;
217 }
218
219 static const struct of_device_id keystone_irq_dt_ids[] = {
220         { .compatible = "ti,keystone-irq", },
221         {},
222 };
223 MODULE_DEVICE_TABLE(of, keystone_irq_dt_ids);
224
225 static struct platform_driver keystone_irq_device_driver = {
226         .probe          = keystone_irq_probe,
227         .remove         = keystone_irq_remove,
228         .driver         = {
229                 .name   = "keystone_irq",
230                 .of_match_table = of_match_ptr(keystone_irq_dt_ids),
231         }
232 };
233
234 module_platform_driver(keystone_irq_device_driver);
235
236 MODULE_AUTHOR("Texas Instruments");
237 MODULE_AUTHOR("Sajesh Kumar Saran");
238 MODULE_AUTHOR("Grygorii Strashko");
239 MODULE_DESCRIPTION("Keystone IRQ chip");
240 MODULE_LICENSE("GPL v2");