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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> | |
22 | #include <linux/irqdomain.h> | |
23 | #include <linux/irqchip/chained_irq.h> | |
24 | #include <linux/of.h> | |
25 | #include <linux/of_platform.h> | |
26 | #include <linux/mfd/syscon.h> | |
27 | #include <linux/regmap.h> | |
28 | #include "irqchip.h" | |
29 | ||
30 | ||
31 | /* The source ID bits start from 4 to 31 (total 28 bits)*/ | |
32 | #define BIT_OFS 4 | |
33 | #define KEYSTONE_N_IRQ (32 - BIT_OFS) | |
34 | ||
35 | struct keystone_irq_device { | |
36 | struct device *dev; | |
37 | struct irq_chip chip; | |
38 | u32 mask; | |
39 | u32 irq; | |
40 | struct irq_domain *irqd; | |
41 | struct regmap *devctrl_regs; | |
42 | u32 devctrl_offset; | |
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 void keystone_irq_handler(unsigned irq, struct irq_desc *desc) | |
88 | { | |
89 | struct keystone_irq_device *kirq = irq_desc_get_handler_data(desc); | |
90 | unsigned long pending; | |
91 | int src, virq; | |
92 | ||
93 | dev_dbg(kirq->dev, "start irq %d\n", irq); | |
94 | ||
95 | chained_irq_enter(irq_desc_get_chip(desc), desc); | |
96 | ||
97 | pending = keystone_irq_readl(kirq); | |
98 | keystone_irq_writel(kirq, pending); | |
99 | ||
100 | dev_dbg(kirq->dev, "pending 0x%lx, mask 0x%x\n", pending, kirq->mask); | |
101 | ||
102 | pending = (pending >> BIT_OFS) & ~kirq->mask; | |
103 | ||
104 | dev_dbg(kirq->dev, "pending after mask 0x%lx\n", pending); | |
105 | ||
106 | for (src = 0; src < KEYSTONE_N_IRQ; src++) { | |
107 | if (BIT(src) & pending) { | |
108 | virq = irq_find_mapping(kirq->irqd, src); | |
109 | dev_dbg(kirq->dev, "dispatch bit %d, virq %d\n", | |
110 | src, virq); | |
111 | if (!virq) | |
112 | dev_warn(kirq->dev, "sporious irq detected hwirq %d, virq %d\n", | |
113 | src, virq); | |
114 | generic_handle_irq(virq); | |
115 | } | |
116 | } | |
117 | ||
118 | chained_irq_exit(irq_desc_get_chip(desc), desc); | |
119 | ||
120 | dev_dbg(kirq->dev, "end irq %d\n", irq); | |
121 | } | |
122 | ||
123 | static int keystone_irq_map(struct irq_domain *h, unsigned int virq, | |
124 | irq_hw_number_t hw) | |
125 | { | |
126 | struct keystone_irq_device *kirq = h->host_data; | |
127 | ||
128 | irq_set_chip_data(virq, kirq); | |
129 | irq_set_chip_and_handler(virq, &kirq->chip, handle_level_irq); | |
130 | set_irq_flags(virq, IRQF_VALID | IRQF_PROBE); | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static struct irq_domain_ops keystone_irq_ops = { | |
135 | .map = keystone_irq_map, | |
136 | .xlate = irq_domain_xlate_onecell, | |
137 | }; | |
138 | ||
139 | static int keystone_irq_probe(struct platform_device *pdev) | |
140 | { | |
141 | struct device *dev = &pdev->dev; | |
142 | struct device_node *np = dev->of_node; | |
143 | struct keystone_irq_device *kirq; | |
144 | int ret; | |
145 | ||
146 | if (np == NULL) | |
147 | return -EINVAL; | |
148 | ||
149 | kirq = devm_kzalloc(dev, sizeof(*kirq), GFP_KERNEL); | |
150 | if (!kirq) | |
151 | return -ENOMEM; | |
152 | ||
153 | kirq->devctrl_regs = | |
154 | syscon_regmap_lookup_by_phandle(np, "ti,syscon-dev"); | |
155 | if (IS_ERR(kirq->devctrl_regs)) | |
156 | return PTR_ERR(kirq->devctrl_regs); | |
157 | ||
158 | ret = of_property_read_u32_index(np, "ti,syscon-dev", 1, | |
159 | &kirq->devctrl_offset); | |
160 | if (ret) { | |
161 | dev_err(dev, "couldn't read the devctrl_offset offset!\n"); | |
162 | return ret; | |
163 | } | |
164 | ||
165 | kirq->irq = platform_get_irq(pdev, 0); | |
166 | if (kirq->irq < 0) { | |
167 | dev_err(dev, "no irq resource %d\n", kirq->irq); | |
168 | return kirq->irq; | |
169 | } | |
170 | ||
171 | kirq->dev = dev; | |
172 | kirq->mask = ~0x0; | |
173 | kirq->chip.name = "keystone-irq"; | |
174 | kirq->chip.irq_ack = keystone_irq_ack; | |
175 | kirq->chip.irq_mask = keystone_irq_setmask; | |
176 | kirq->chip.irq_unmask = keystone_irq_unmask; | |
177 | ||
178 | kirq->irqd = irq_domain_add_linear(np, KEYSTONE_N_IRQ, | |
179 | &keystone_irq_ops, kirq); | |
180 | if (!kirq->irqd) { | |
181 | dev_err(dev, "IRQ domain registration failed\n"); | |
182 | return -ENODEV; | |
183 | } | |
184 | ||
185 | platform_set_drvdata(pdev, kirq); | |
186 | ||
187 | irq_set_chained_handler(kirq->irq, keystone_irq_handler); | |
188 | irq_set_handler_data(kirq->irq, kirq); | |
189 | ||
190 | /* clear all source bits */ | |
191 | keystone_irq_writel(kirq, ~0x0); | |
192 | ||
193 | dev_info(dev, "irqchip registered, nr_irqs %u\n", KEYSTONE_N_IRQ); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static int keystone_irq_remove(struct platform_device *pdev) | |
199 | { | |
200 | struct keystone_irq_device *kirq = platform_get_drvdata(pdev); | |
201 | int hwirq; | |
202 | ||
203 | for (hwirq = 0; hwirq < KEYSTONE_N_IRQ; hwirq++) | |
204 | irq_dispose_mapping(irq_find_mapping(kirq->irqd, hwirq)); | |
205 | ||
206 | irq_domain_remove(kirq->irqd); | |
207 | return 0; | |
208 | } | |
209 | ||
210 | static const struct of_device_id keystone_irq_dt_ids[] = { | |
211 | { .compatible = "ti,keystone-irq", }, | |
212 | {}, | |
213 | }; | |
214 | MODULE_DEVICE_TABLE(of, keystone_irq_dt_ids); | |
215 | ||
216 | static struct platform_driver keystone_irq_device_driver = { | |
217 | .probe = keystone_irq_probe, | |
218 | .remove = keystone_irq_remove, | |
219 | .driver = { | |
220 | .name = "keystone_irq", | |
221 | .owner = THIS_MODULE, | |
222 | .of_match_table = of_match_ptr(keystone_irq_dt_ids), | |
223 | } | |
224 | }; | |
225 | ||
226 | module_platform_driver(keystone_irq_device_driver); | |
227 | ||
228 | MODULE_AUTHOR("Texas Instruments"); | |
229 | MODULE_AUTHOR("Sajesh Kumar Saran"); | |
230 | MODULE_AUTHOR("Grygorii Strashko"); | |
231 | MODULE_DESCRIPTION("Keystone IRQ chip"); | |
232 | MODULE_LICENSE("GPL v2"); |