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e25a96d7 | 1 | // SPDX-License-Identifier: GPL-2.0 |
fbc83b7f MD |
2 | /* |
3 | * Renesas IRQC Driver | |
4 | * | |
5 | * Copyright (C) 2013 Magnus Damm | |
fbc83b7f MD |
6 | */ |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/platform_device.h> | |
fbc83b7f MD |
10 | #include <linux/interrupt.h> |
11 | #include <linux/ioport.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/irq.h> | |
14 | #include <linux/irqdomain.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/module.h> | |
51b05f6b | 18 | #include <linux/pm_runtime.h> |
fbc83b7f | 19 | |
1cd5ec73 | 20 | #define IRQC_IRQ_MAX 32 /* maximum 32 interrupts per driver instance */ |
fbc83b7f | 21 | |
1cd5ec73 GU |
22 | #define IRQC_REQ_STS 0x00 /* Interrupt Request Status Register */ |
23 | #define IRQC_EN_STS 0x04 /* Interrupt Enable Status Register */ | |
24 | #define IRQC_EN_SET 0x08 /* Interrupt Enable Set Register */ | |
fbc83b7f | 25 | #define IRQC_INT_CPU_BASE(n) (0x000 + ((n) * 0x10)) |
1cd5ec73 GU |
26 | /* SYS-CPU vs. RT-CPU */ |
27 | #define DETECT_STATUS 0x100 /* IRQn Detect Status Register */ | |
28 | #define MONITOR 0x104 /* IRQn Signal Level Monitor Register */ | |
29 | #define HLVL_STS 0x108 /* IRQn High Level Detect Status Register */ | |
30 | #define LLVL_STS 0x10c /* IRQn Low Level Detect Status Register */ | |
31 | #define S_R_EDGE_STS 0x110 /* IRQn Sync Rising Edge Detect Status Reg. */ | |
32 | #define S_F_EDGE_STS 0x114 /* IRQn Sync Falling Edge Detect Status Reg. */ | |
33 | #define A_R_EDGE_STS 0x118 /* IRQn Async Rising Edge Detect Status Reg. */ | |
34 | #define A_F_EDGE_STS 0x11c /* IRQn Async Falling Edge Detect Status Reg. */ | |
35 | #define CHTEN_STS 0x120 /* Chattering Reduction Status Register */ | |
fbc83b7f | 36 | #define IRQC_CONFIG(n) (0x180 + ((n) * 0x04)) |
1cd5ec73 | 37 | /* IRQn Configuration Register */ |
fbc83b7f MD |
38 | |
39 | struct irqc_irq { | |
40 | int hw_irq; | |
41 | int requested_irq; | |
fbc83b7f MD |
42 | struct irqc_priv *p; |
43 | }; | |
44 | ||
45 | struct irqc_priv { | |
46 | void __iomem *iomem; | |
47 | void __iomem *cpu_int_base; | |
48 | struct irqc_irq irq[IRQC_IRQ_MAX]; | |
fbc83b7f | 49 | unsigned int number_of_irqs; |
000e20c5 | 50 | struct device *dev; |
99c221df | 51 | struct irq_chip_generic *gc; |
fbc83b7f | 52 | struct irq_domain *irq_domain; |
734e036a | 53 | atomic_t wakeup_path; |
fbc83b7f MD |
54 | }; |
55 | ||
99c221df | 56 | static struct irqc_priv *irq_data_to_priv(struct irq_data *data) |
fbc83b7f | 57 | { |
99c221df | 58 | return data->domain->host_data; |
fbc83b7f MD |
59 | } |
60 | ||
99c221df | 61 | static void irqc_dbg(struct irqc_irq *i, char *str) |
fbc83b7f | 62 | { |
000e20c5 | 63 | dev_dbg(i->p->dev, "%s (%d:%d)\n", str, i->requested_irq, i->hw_irq); |
fbc83b7f MD |
64 | } |
65 | ||
fbc83b7f | 66 | static unsigned char irqc_sense[IRQ_TYPE_SENSE_MASK + 1] = { |
ce70af18 SS |
67 | [IRQ_TYPE_LEVEL_LOW] = 0x01, |
68 | [IRQ_TYPE_LEVEL_HIGH] = 0x02, | |
69 | [IRQ_TYPE_EDGE_FALLING] = 0x04, /* Synchronous */ | |
70 | [IRQ_TYPE_EDGE_RISING] = 0x08, /* Synchronous */ | |
71 | [IRQ_TYPE_EDGE_BOTH] = 0x0c, /* Synchronous */ | |
fbc83b7f MD |
72 | }; |
73 | ||
74 | static int irqc_irq_set_type(struct irq_data *d, unsigned int type) | |
75 | { | |
99c221df | 76 | struct irqc_priv *p = irq_data_to_priv(d); |
fbc83b7f MD |
77 | int hw_irq = irqd_to_hwirq(d); |
78 | unsigned char value = irqc_sense[type & IRQ_TYPE_SENSE_MASK]; | |
f791e3c1 | 79 | u32 tmp; |
fbc83b7f MD |
80 | |
81 | irqc_dbg(&p->irq[hw_irq], "sense"); | |
82 | ||
ce70af18 | 83 | if (!value) |
fbc83b7f MD |
84 | return -EINVAL; |
85 | ||
86 | tmp = ioread32(p->iomem + IRQC_CONFIG(hw_irq)); | |
87 | tmp &= ~0x3f; | |
ce70af18 | 88 | tmp |= value; |
fbc83b7f MD |
89 | iowrite32(tmp, p->iomem + IRQC_CONFIG(hw_irq)); |
90 | return 0; | |
91 | } | |
92 | ||
6f46aedb GU |
93 | static int irqc_irq_set_wake(struct irq_data *d, unsigned int on) |
94 | { | |
99c221df | 95 | struct irqc_priv *p = irq_data_to_priv(d); |
4cd7863e GU |
96 | int hw_irq = irqd_to_hwirq(d); |
97 | ||
98 | irq_set_irq_wake(p->irq[hw_irq].requested_irq, on); | |
6f46aedb | 99 | if (on) |
734e036a | 100 | atomic_inc(&p->wakeup_path); |
6f46aedb | 101 | else |
734e036a | 102 | atomic_dec(&p->wakeup_path); |
6f46aedb GU |
103 | |
104 | return 0; | |
105 | } | |
106 | ||
fbc83b7f MD |
107 | static irqreturn_t irqc_irq_handler(int irq, void *dev_id) |
108 | { | |
109 | struct irqc_irq *i = dev_id; | |
110 | struct irqc_priv *p = i->p; | |
f791e3c1 | 111 | u32 bit = BIT(i->hw_irq); |
fbc83b7f MD |
112 | |
113 | irqc_dbg(i, "demux1"); | |
114 | ||
115 | if (ioread32(p->iomem + DETECT_STATUS) & bit) { | |
116 | iowrite32(bit, p->iomem + DETECT_STATUS); | |
117 | irqc_dbg(i, "demux2"); | |
e10fc03c | 118 | generic_handle_irq(irq_find_mapping(p->irq_domain, i->hw_irq)); |
fbc83b7f MD |
119 | return IRQ_HANDLED; |
120 | } | |
121 | return IRQ_NONE; | |
122 | } | |
123 | ||
fbc83b7f MD |
124 | static int irqc_probe(struct platform_device *pdev) |
125 | { | |
9ae48bc0 GU |
126 | struct device *dev = &pdev->dev; |
127 | const char *name = dev_name(dev); | |
fbc83b7f | 128 | struct irqc_priv *p; |
fbc83b7f | 129 | struct resource *irq; |
fbc83b7f MD |
130 | int ret; |
131 | int k; | |
132 | ||
4770533f GU |
133 | p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL); |
134 | if (!p) | |
135 | return -ENOMEM; | |
fbc83b7f | 136 | |
000e20c5 | 137 | p->dev = dev; |
fbc83b7f MD |
138 | platform_set_drvdata(pdev, p); |
139 | ||
9ae48bc0 GU |
140 | pm_runtime_enable(dev); |
141 | pm_runtime_get_sync(dev); | |
51b05f6b | 142 | |
fbc83b7f MD |
143 | /* allow any number of IRQs between 1 and IRQC_IRQ_MAX */ |
144 | for (k = 0; k < IRQC_IRQ_MAX; k++) { | |
145 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, k); | |
146 | if (!irq) | |
147 | break; | |
148 | ||
149 | p->irq[k].p = p; | |
e10fc03c | 150 | p->irq[k].hw_irq = k; |
fbc83b7f MD |
151 | p->irq[k].requested_irq = irq->start; |
152 | } | |
153 | ||
154 | p->number_of_irqs = k; | |
155 | if (p->number_of_irqs < 1) { | |
9ae48bc0 | 156 | dev_err(dev, "not enough IRQ resources\n"); |
fbc83b7f | 157 | ret = -EINVAL; |
4770533f | 158 | goto err_runtime_pm_disable; |
fbc83b7f MD |
159 | } |
160 | ||
161 | /* ioremap IOMEM and setup read/write callbacks */ | |
4770533f GU |
162 | p->iomem = devm_platform_ioremap_resource(pdev, 0); |
163 | if (IS_ERR(p->iomem)) { | |
164 | ret = PTR_ERR(p->iomem); | |
165 | goto err_runtime_pm_disable; | |
fbc83b7f MD |
166 | } |
167 | ||
168 | p->cpu_int_base = p->iomem + IRQC_INT_CPU_BASE(0); /* SYS-SPI */ | |
169 | ||
9ae48bc0 | 170 | p->irq_domain = irq_domain_add_linear(dev->of_node, p->number_of_irqs, |
99c221df | 171 | &irq_generic_chip_ops, p); |
fbc83b7f MD |
172 | if (!p->irq_domain) { |
173 | ret = -ENXIO; | |
9ae48bc0 | 174 | dev_err(dev, "cannot initialize irq domain\n"); |
4770533f | 175 | goto err_runtime_pm_disable; |
fbc83b7f MD |
176 | } |
177 | ||
99c221df | 178 | ret = irq_alloc_domain_generic_chips(p->irq_domain, p->number_of_irqs, |
17c88892 | 179 | 1, "irqc", handle_level_irq, |
99c221df MD |
180 | 0, 0, IRQ_GC_INIT_NESTED_LOCK); |
181 | if (ret) { | |
9ae48bc0 | 182 | dev_err(dev, "cannot allocate generic chip\n"); |
4770533f | 183 | goto err_remove_domain; |
99c221df MD |
184 | } |
185 | ||
186 | p->gc = irq_get_domain_generic_chip(p->irq_domain, 0); | |
187 | p->gc->reg_base = p->cpu_int_base; | |
188 | p->gc->chip_types[0].regs.enable = IRQC_EN_SET; | |
189 | p->gc->chip_types[0].regs.disable = IRQC_EN_STS; | |
17c88892 | 190 | p->gc->chip_types[0].chip.parent_device = dev; |
99c221df MD |
191 | p->gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg; |
192 | p->gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg; | |
193 | p->gc->chip_types[0].chip.irq_set_type = irqc_irq_set_type; | |
194 | p->gc->chip_types[0].chip.irq_set_wake = irqc_irq_set_wake; | |
195 | p->gc->chip_types[0].chip.flags = IRQCHIP_MASK_ON_SUSPEND; | |
196 | ||
fbc83b7f MD |
197 | /* request interrupts one by one */ |
198 | for (k = 0; k < p->number_of_irqs; k++) { | |
4770533f GU |
199 | if (devm_request_irq(dev, p->irq[k].requested_irq, |
200 | irqc_irq_handler, 0, name, &p->irq[k])) { | |
9ae48bc0 | 201 | dev_err(dev, "failed to request IRQ\n"); |
fbc83b7f | 202 | ret = -ENOENT; |
4770533f | 203 | goto err_remove_domain; |
fbc83b7f MD |
204 | } |
205 | } | |
206 | ||
9ae48bc0 | 207 | dev_info(dev, "driving %d irqs\n", p->number_of_irqs); |
fbc83b7f | 208 | |
fbc83b7f | 209 | return 0; |
fbc83b7f | 210 | |
4770533f | 211 | err_remove_domain: |
fbc83b7f | 212 | irq_domain_remove(p->irq_domain); |
4770533f | 213 | err_runtime_pm_disable: |
9ae48bc0 GU |
214 | pm_runtime_put(dev); |
215 | pm_runtime_disable(dev); | |
fbc83b7f MD |
216 | return ret; |
217 | } | |
218 | ||
219 | static int irqc_remove(struct platform_device *pdev) | |
220 | { | |
221 | struct irqc_priv *p = platform_get_drvdata(pdev); | |
fbc83b7f MD |
222 | |
223 | irq_domain_remove(p->irq_domain); | |
51b05f6b GU |
224 | pm_runtime_put(&pdev->dev); |
225 | pm_runtime_disable(&pdev->dev); | |
fbc83b7f MD |
226 | return 0; |
227 | } | |
228 | ||
734e036a GU |
229 | static int __maybe_unused irqc_suspend(struct device *dev) |
230 | { | |
231 | struct irqc_priv *p = dev_get_drvdata(dev); | |
232 | ||
233 | if (atomic_read(&p->wakeup_path)) | |
234 | device_set_wakeup_path(dev); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static SIMPLE_DEV_PM_OPS(irqc_pm_ops, irqc_suspend, NULL); | |
240 | ||
3b8dfa7c MD |
241 | static const struct of_device_id irqc_dt_ids[] = { |
242 | { .compatible = "renesas,irqc", }, | |
243 | {}, | |
244 | }; | |
245 | MODULE_DEVICE_TABLE(of, irqc_dt_ids); | |
246 | ||
fbc83b7f MD |
247 | static struct platform_driver irqc_device_driver = { |
248 | .probe = irqc_probe, | |
249 | .remove = irqc_remove, | |
250 | .driver = { | |
251 | .name = "renesas_irqc", | |
3b8dfa7c | 252 | .of_match_table = irqc_dt_ids, |
734e036a | 253 | .pm = &irqc_pm_ops, |
fbc83b7f MD |
254 | } |
255 | }; | |
256 | ||
257 | static int __init irqc_init(void) | |
258 | { | |
259 | return platform_driver_register(&irqc_device_driver); | |
260 | } | |
261 | postcore_initcall(irqc_init); | |
262 | ||
263 | static void __exit irqc_exit(void) | |
264 | { | |
265 | platform_driver_unregister(&irqc_device_driver); | |
266 | } | |
267 | module_exit(irqc_exit); | |
268 | ||
269 | MODULE_AUTHOR("Magnus Damm"); | |
270 | MODULE_DESCRIPTION("Renesas IRQC Driver"); | |
271 | MODULE_LICENSE("GPL v2"); |