Commit | Line | Data |
---|---|---|
89323f8c GS |
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> | |
2f884e6e | 22 | #include <linux/interrupt.h> |
89323f8c | 23 | #include <linux/irqdomain.h> |
41a83e06 | 24 | #include <linux/irqchip.h> |
89323f8c GS |
25 | #include <linux/of.h> |
26 | #include <linux/of_platform.h> | |
27 | #include <linux/mfd/syscon.h> | |
28 | #include <linux/regmap.h> | |
89323f8c GS |
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; | |
8703ec19 | 38 | int irq; |
89323f8c GS |
39 | struct irq_domain *irqd; |
40 | struct regmap *devctrl_regs; | |
41 | u32 devctrl_offset; | |
2f884e6e | 42 | raw_spinlock_t wa_lock; |
89323f8c GS |
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 | ||
2f884e6e | 87 | static irqreturn_t keystone_irq_handler(int irq, void *keystone_irq) |
89323f8c | 88 | { |
2f884e6e SG |
89 | struct keystone_irq_device *kirq = keystone_irq; |
90 | unsigned long wa_lock_flags; | |
89323f8c GS |
91 | unsigned long pending; |
92 | int src, virq; | |
93 | ||
94 | dev_dbg(kirq->dev, "start irq %d\n", irq); | |
95 | ||
89323f8c GS |
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) | |
2349f205 | 111 | dev_warn(kirq->dev, "spurious irq detected hwirq %d, virq %d\n", |
89323f8c | 112 | src, virq); |
2f884e6e | 113 | raw_spin_lock_irqsave(&kirq->wa_lock, wa_lock_flags); |
89323f8c | 114 | generic_handle_irq(virq); |
2f884e6e SG |
115 | raw_spin_unlock_irqrestore(&kirq->wa_lock, |
116 | wa_lock_flags); | |
89323f8c GS |
117 | } |
118 | } | |
119 | ||
89323f8c | 120 | dev_dbg(kirq->dev, "end irq %d\n", irq); |
2f884e6e | 121 | return IRQ_HANDLED; |
89323f8c GS |
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); | |
d17cab44 | 131 | irq_set_probe(virq); |
89323f8c GS |
132 | return 0; |
133 | } | |
134 | ||
96009736 | 135 | static const struct irq_domain_ops keystone_irq_ops = { |
89323f8c GS |
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); | |
6c9050a7 | 167 | if (kirq->irq < 0) |
89323f8c | 168 | return kirq->irq; |
89323f8c GS |
169 | |
170 | kirq->dev = dev; | |
171 | kirq->mask = ~0x0; | |
172 | kirq->chip.name = "keystone-irq"; | |
173 | kirq->chip.irq_ack = keystone_irq_ack; | |
174 | kirq->chip.irq_mask = keystone_irq_setmask; | |
175 | kirq->chip.irq_unmask = keystone_irq_unmask; | |
176 | ||
177 | kirq->irqd = irq_domain_add_linear(np, KEYSTONE_N_IRQ, | |
178 | &keystone_irq_ops, kirq); | |
179 | if (!kirq->irqd) { | |
180 | dev_err(dev, "IRQ domain registration failed\n"); | |
181 | return -ENODEV; | |
182 | } | |
183 | ||
2f884e6e SG |
184 | raw_spin_lock_init(&kirq->wa_lock); |
185 | ||
89323f8c GS |
186 | platform_set_drvdata(pdev, kirq); |
187 | ||
2f884e6e SG |
188 | ret = request_irq(kirq->irq, keystone_irq_handler, |
189 | 0, dev_name(dev), kirq); | |
190 | if (ret) { | |
191 | irq_domain_remove(kirq->irqd); | |
192 | return ret; | |
193 | } | |
89323f8c GS |
194 | |
195 | /* clear all source bits */ | |
196 | keystone_irq_writel(kirq, ~0x0); | |
197 | ||
198 | dev_info(dev, "irqchip registered, nr_irqs %u\n", KEYSTONE_N_IRQ); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static int keystone_irq_remove(struct platform_device *pdev) | |
204 | { | |
205 | struct keystone_irq_device *kirq = platform_get_drvdata(pdev); | |
206 | int hwirq; | |
207 | ||
2f884e6e SG |
208 | free_irq(kirq->irq, kirq); |
209 | ||
89323f8c GS |
210 | for (hwirq = 0; hwirq < KEYSTONE_N_IRQ; hwirq++) |
211 | irq_dispose_mapping(irq_find_mapping(kirq->irqd, hwirq)); | |
212 | ||
213 | irq_domain_remove(kirq->irqd); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static const struct of_device_id keystone_irq_dt_ids[] = { | |
218 | { .compatible = "ti,keystone-irq", }, | |
219 | {}, | |
220 | }; | |
221 | MODULE_DEVICE_TABLE(of, keystone_irq_dt_ids); | |
222 | ||
223 | static struct platform_driver keystone_irq_device_driver = { | |
224 | .probe = keystone_irq_probe, | |
225 | .remove = keystone_irq_remove, | |
226 | .driver = { | |
227 | .name = "keystone_irq", | |
89323f8c GS |
228 | .of_match_table = of_match_ptr(keystone_irq_dt_ids), |
229 | } | |
230 | }; | |
231 | ||
232 | module_platform_driver(keystone_irq_device_driver); | |
233 | ||
234 | MODULE_AUTHOR("Texas Instruments"); | |
235 | MODULE_AUTHOR("Sajesh Kumar Saran"); | |
236 | MODULE_AUTHOR("Grygorii Strashko"); | |
237 | MODULE_DESCRIPTION("Keystone IRQ chip"); | |
238 | MODULE_LICENSE("GPL v2"); |