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fbc83b7f MD |
1 | /* |
2 | * Renesas IRQC Driver | |
3 | * | |
4 | * Copyright (C) 2013 Magnus Damm | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
6f46aedb | 20 | #include <linux/clk.h> |
fbc83b7f MD |
21 | #include <linux/init.h> |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/io.h> | |
27 | #include <linux/irq.h> | |
28 | #include <linux/irqdomain.h> | |
29 | #include <linux/err.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/platform_data/irq-renesas-irqc.h> | |
51b05f6b | 33 | #include <linux/pm_runtime.h> |
fbc83b7f | 34 | |
1cd5ec73 | 35 | #define IRQC_IRQ_MAX 32 /* maximum 32 interrupts per driver instance */ |
fbc83b7f | 36 | |
1cd5ec73 GU |
37 | #define IRQC_REQ_STS 0x00 /* Interrupt Request Status Register */ |
38 | #define IRQC_EN_STS 0x04 /* Interrupt Enable Status Register */ | |
39 | #define IRQC_EN_SET 0x08 /* Interrupt Enable Set Register */ | |
fbc83b7f | 40 | #define IRQC_INT_CPU_BASE(n) (0x000 + ((n) * 0x10)) |
1cd5ec73 GU |
41 | /* SYS-CPU vs. RT-CPU */ |
42 | #define DETECT_STATUS 0x100 /* IRQn Detect Status Register */ | |
43 | #define MONITOR 0x104 /* IRQn Signal Level Monitor Register */ | |
44 | #define HLVL_STS 0x108 /* IRQn High Level Detect Status Register */ | |
45 | #define LLVL_STS 0x10c /* IRQn Low Level Detect Status Register */ | |
46 | #define S_R_EDGE_STS 0x110 /* IRQn Sync Rising Edge Detect Status Reg. */ | |
47 | #define S_F_EDGE_STS 0x114 /* IRQn Sync Falling Edge Detect Status Reg. */ | |
48 | #define A_R_EDGE_STS 0x118 /* IRQn Async Rising Edge Detect Status Reg. */ | |
49 | #define A_F_EDGE_STS 0x11c /* IRQn Async Falling Edge Detect Status Reg. */ | |
50 | #define CHTEN_STS 0x120 /* Chattering Reduction Status Register */ | |
fbc83b7f | 51 | #define IRQC_CONFIG(n) (0x180 + ((n) * 0x04)) |
1cd5ec73 | 52 | /* IRQn Configuration Register */ |
fbc83b7f MD |
53 | |
54 | struct irqc_irq { | |
55 | int hw_irq; | |
56 | int requested_irq; | |
57 | int domain_irq; | |
58 | struct irqc_priv *p; | |
59 | }; | |
60 | ||
61 | struct irqc_priv { | |
62 | void __iomem *iomem; | |
63 | void __iomem *cpu_int_base; | |
64 | struct irqc_irq irq[IRQC_IRQ_MAX]; | |
65 | struct renesas_irqc_config config; | |
66 | unsigned int number_of_irqs; | |
67 | struct platform_device *pdev; | |
68 | struct irq_chip irq_chip; | |
69 | struct irq_domain *irq_domain; | |
6f46aedb | 70 | struct clk *clk; |
fbc83b7f MD |
71 | }; |
72 | ||
73 | static void irqc_dbg(struct irqc_irq *i, char *str) | |
74 | { | |
75 | dev_dbg(&i->p->pdev->dev, "%s (%d:%d:%d)\n", | |
76 | str, i->requested_irq, i->hw_irq, i->domain_irq); | |
77 | } | |
78 | ||
79 | static void irqc_irq_enable(struct irq_data *d) | |
80 | { | |
81 | struct irqc_priv *p = irq_data_get_irq_chip_data(d); | |
82 | int hw_irq = irqd_to_hwirq(d); | |
83 | ||
84 | irqc_dbg(&p->irq[hw_irq], "enable"); | |
85 | iowrite32(BIT(hw_irq), p->cpu_int_base + IRQC_EN_SET); | |
86 | } | |
87 | ||
88 | static void irqc_irq_disable(struct irq_data *d) | |
89 | { | |
90 | struct irqc_priv *p = irq_data_get_irq_chip_data(d); | |
91 | int hw_irq = irqd_to_hwirq(d); | |
92 | ||
93 | irqc_dbg(&p->irq[hw_irq], "disable"); | |
94 | iowrite32(BIT(hw_irq), p->cpu_int_base + IRQC_EN_STS); | |
95 | } | |
96 | ||
fbc83b7f | 97 | static unsigned char irqc_sense[IRQ_TYPE_SENSE_MASK + 1] = { |
ce70af18 SS |
98 | [IRQ_TYPE_LEVEL_LOW] = 0x01, |
99 | [IRQ_TYPE_LEVEL_HIGH] = 0x02, | |
100 | [IRQ_TYPE_EDGE_FALLING] = 0x04, /* Synchronous */ | |
101 | [IRQ_TYPE_EDGE_RISING] = 0x08, /* Synchronous */ | |
102 | [IRQ_TYPE_EDGE_BOTH] = 0x0c, /* Synchronous */ | |
fbc83b7f MD |
103 | }; |
104 | ||
105 | static int irqc_irq_set_type(struct irq_data *d, unsigned int type) | |
106 | { | |
107 | struct irqc_priv *p = irq_data_get_irq_chip_data(d); | |
108 | int hw_irq = irqd_to_hwirq(d); | |
109 | unsigned char value = irqc_sense[type & IRQ_TYPE_SENSE_MASK]; | |
f791e3c1 | 110 | u32 tmp; |
fbc83b7f MD |
111 | |
112 | irqc_dbg(&p->irq[hw_irq], "sense"); | |
113 | ||
ce70af18 | 114 | if (!value) |
fbc83b7f MD |
115 | return -EINVAL; |
116 | ||
117 | tmp = ioread32(p->iomem + IRQC_CONFIG(hw_irq)); | |
118 | tmp &= ~0x3f; | |
ce70af18 | 119 | tmp |= value; |
fbc83b7f MD |
120 | iowrite32(tmp, p->iomem + IRQC_CONFIG(hw_irq)); |
121 | return 0; | |
122 | } | |
123 | ||
6f46aedb GU |
124 | static int irqc_irq_set_wake(struct irq_data *d, unsigned int on) |
125 | { | |
126 | struct irqc_priv *p = irq_data_get_irq_chip_data(d); | |
127 | ||
128 | if (!p->clk) | |
129 | return 0; | |
130 | ||
131 | if (on) | |
132 | clk_enable(p->clk); | |
133 | else | |
134 | clk_disable(p->clk); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
fbc83b7f MD |
139 | static irqreturn_t irqc_irq_handler(int irq, void *dev_id) |
140 | { | |
141 | struct irqc_irq *i = dev_id; | |
142 | struct irqc_priv *p = i->p; | |
f791e3c1 | 143 | u32 bit = BIT(i->hw_irq); |
fbc83b7f MD |
144 | |
145 | irqc_dbg(i, "demux1"); | |
146 | ||
147 | if (ioread32(p->iomem + DETECT_STATUS) & bit) { | |
148 | iowrite32(bit, p->iomem + DETECT_STATUS); | |
149 | irqc_dbg(i, "demux2"); | |
150 | generic_handle_irq(i->domain_irq); | |
151 | return IRQ_HANDLED; | |
152 | } | |
153 | return IRQ_NONE; | |
154 | } | |
155 | ||
156 | static int irqc_irq_domain_map(struct irq_domain *h, unsigned int virq, | |
157 | irq_hw_number_t hw) | |
158 | { | |
159 | struct irqc_priv *p = h->host_data; | |
160 | ||
161 | p->irq[hw].domain_irq = virq; | |
162 | p->irq[hw].hw_irq = hw; | |
163 | ||
164 | irqc_dbg(&p->irq[hw], "map"); | |
165 | irq_set_chip_data(virq, h->host_data); | |
166 | irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq); | |
167 | set_irq_flags(virq, IRQF_VALID); /* kill me now */ | |
168 | return 0; | |
169 | } | |
170 | ||
171 | static struct irq_domain_ops irqc_irq_domain_ops = { | |
172 | .map = irqc_irq_domain_map, | |
3b8dfa7c | 173 | .xlate = irq_domain_xlate_twocell, |
fbc83b7f MD |
174 | }; |
175 | ||
176 | static int irqc_probe(struct platform_device *pdev) | |
177 | { | |
178 | struct renesas_irqc_config *pdata = pdev->dev.platform_data; | |
179 | struct irqc_priv *p; | |
180 | struct resource *io; | |
181 | struct resource *irq; | |
182 | struct irq_chip *irq_chip; | |
183 | const char *name = dev_name(&pdev->dev); | |
184 | int ret; | |
185 | int k; | |
186 | ||
187 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
188 | if (!p) { | |
189 | dev_err(&pdev->dev, "failed to allocate driver data\n"); | |
190 | ret = -ENOMEM; | |
191 | goto err0; | |
192 | } | |
193 | ||
194 | /* deal with driver instance configuration */ | |
195 | if (pdata) | |
196 | memcpy(&p->config, pdata, sizeof(*pdata)); | |
197 | ||
198 | p->pdev = pdev; | |
199 | platform_set_drvdata(pdev, p); | |
200 | ||
6f46aedb GU |
201 | p->clk = devm_clk_get(&pdev->dev, NULL); |
202 | if (IS_ERR(p->clk)) { | |
203 | dev_warn(&pdev->dev, "unable to get clock\n"); | |
204 | p->clk = NULL; | |
205 | } | |
206 | ||
51b05f6b GU |
207 | pm_runtime_enable(&pdev->dev); |
208 | pm_runtime_get_sync(&pdev->dev); | |
209 | ||
fbc83b7f MD |
210 | /* get hold of manadatory IOMEM */ |
211 | io = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
212 | if (!io) { | |
213 | dev_err(&pdev->dev, "not enough IOMEM resources\n"); | |
214 | ret = -EINVAL; | |
215 | goto err1; | |
216 | } | |
217 | ||
218 | /* allow any number of IRQs between 1 and IRQC_IRQ_MAX */ | |
219 | for (k = 0; k < IRQC_IRQ_MAX; k++) { | |
220 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, k); | |
221 | if (!irq) | |
222 | break; | |
223 | ||
224 | p->irq[k].p = p; | |
225 | p->irq[k].requested_irq = irq->start; | |
226 | } | |
227 | ||
228 | p->number_of_irqs = k; | |
229 | if (p->number_of_irqs < 1) { | |
230 | dev_err(&pdev->dev, "not enough IRQ resources\n"); | |
231 | ret = -EINVAL; | |
232 | goto err1; | |
233 | } | |
234 | ||
235 | /* ioremap IOMEM and setup read/write callbacks */ | |
236 | p->iomem = ioremap_nocache(io->start, resource_size(io)); | |
237 | if (!p->iomem) { | |
238 | dev_err(&pdev->dev, "failed to remap IOMEM\n"); | |
239 | ret = -ENXIO; | |
240 | goto err2; | |
241 | } | |
242 | ||
243 | p->cpu_int_base = p->iomem + IRQC_INT_CPU_BASE(0); /* SYS-SPI */ | |
244 | ||
245 | irq_chip = &p->irq_chip; | |
246 | irq_chip->name = name; | |
247 | irq_chip->irq_mask = irqc_irq_disable; | |
248 | irq_chip->irq_unmask = irqc_irq_enable; | |
fbc83b7f | 249 | irq_chip->irq_set_type = irqc_irq_set_type; |
6f46aedb GU |
250 | irq_chip->irq_set_wake = irqc_irq_set_wake; |
251 | irq_chip->flags = IRQCHIP_MASK_ON_SUSPEND; | |
fbc83b7f MD |
252 | |
253 | p->irq_domain = irq_domain_add_simple(pdev->dev.of_node, | |
254 | p->number_of_irqs, | |
255 | p->config.irq_base, | |
256 | &irqc_irq_domain_ops, p); | |
257 | if (!p->irq_domain) { | |
258 | ret = -ENXIO; | |
259 | dev_err(&pdev->dev, "cannot initialize irq domain\n"); | |
260 | goto err2; | |
261 | } | |
262 | ||
263 | /* request interrupts one by one */ | |
264 | for (k = 0; k < p->number_of_irqs; k++) { | |
265 | if (request_irq(p->irq[k].requested_irq, irqc_irq_handler, | |
266 | 0, name, &p->irq[k])) { | |
267 | dev_err(&pdev->dev, "failed to request IRQ\n"); | |
268 | ret = -ENOENT; | |
269 | goto err3; | |
270 | } | |
271 | } | |
272 | ||
273 | dev_info(&pdev->dev, "driving %d irqs\n", p->number_of_irqs); | |
274 | ||
275 | /* warn in case of mismatch if irq base is specified */ | |
276 | if (p->config.irq_base) { | |
277 | if (p->config.irq_base != p->irq[0].domain_irq) | |
278 | dev_warn(&pdev->dev, "irq base mismatch (%d/%d)\n", | |
279 | p->config.irq_base, p->irq[0].domain_irq); | |
280 | } | |
281 | ||
282 | return 0; | |
283 | err3: | |
dfaf820a AL |
284 | while (--k >= 0) |
285 | free_irq(p->irq[k].requested_irq, &p->irq[k]); | |
fbc83b7f MD |
286 | |
287 | irq_domain_remove(p->irq_domain); | |
288 | err2: | |
289 | iounmap(p->iomem); | |
290 | err1: | |
51b05f6b GU |
291 | pm_runtime_put(&pdev->dev); |
292 | pm_runtime_disable(&pdev->dev); | |
fbc83b7f MD |
293 | kfree(p); |
294 | err0: | |
295 | return ret; | |
296 | } | |
297 | ||
298 | static int irqc_remove(struct platform_device *pdev) | |
299 | { | |
300 | struct irqc_priv *p = platform_get_drvdata(pdev); | |
301 | int k; | |
302 | ||
303 | for (k = 0; k < p->number_of_irqs; k++) | |
304 | free_irq(p->irq[k].requested_irq, &p->irq[k]); | |
305 | ||
306 | irq_domain_remove(p->irq_domain); | |
307 | iounmap(p->iomem); | |
51b05f6b GU |
308 | pm_runtime_put(&pdev->dev); |
309 | pm_runtime_disable(&pdev->dev); | |
fbc83b7f MD |
310 | kfree(p); |
311 | return 0; | |
312 | } | |
313 | ||
3b8dfa7c MD |
314 | static const struct of_device_id irqc_dt_ids[] = { |
315 | { .compatible = "renesas,irqc", }, | |
316 | {}, | |
317 | }; | |
318 | MODULE_DEVICE_TABLE(of, irqc_dt_ids); | |
319 | ||
fbc83b7f MD |
320 | static struct platform_driver irqc_device_driver = { |
321 | .probe = irqc_probe, | |
322 | .remove = irqc_remove, | |
323 | .driver = { | |
324 | .name = "renesas_irqc", | |
3b8dfa7c | 325 | .of_match_table = irqc_dt_ids, |
fbc83b7f MD |
326 | } |
327 | }; | |
328 | ||
329 | static int __init irqc_init(void) | |
330 | { | |
331 | return platform_driver_register(&irqc_device_driver); | |
332 | } | |
333 | postcore_initcall(irqc_init); | |
334 | ||
335 | static void __exit irqc_exit(void) | |
336 | { | |
337 | platform_driver_unregister(&irqc_device_driver); | |
338 | } | |
339 | module_exit(irqc_exit); | |
340 | ||
341 | MODULE_AUTHOR("Magnus Damm"); | |
342 | MODULE_DESCRIPTION("Renesas IRQC Driver"); | |
343 | MODULE_LICENSE("GPL v2"); |