]>
Commit | Line | Data |
---|---|---|
38cf0d46 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
215f4cc0 JB |
2 | /* |
3 | * Copyright (c) 2015 Endless Mobile, Inc. | |
4 | * Author: Carlo Caione <carlo@endlessm.com> | |
5 | * Copyright (c) 2016 BayLibre, SAS. | |
6 | * Author: Jerome Brunet <jbrunet@baylibre.com> | |
215f4cc0 JB |
7 | */ |
8 | ||
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
10 | ||
11 | #include <linux/io.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/irq.h> | |
14 | #include <linux/irqdomain.h> | |
15 | #include <linux/irqchip.h> | |
16 | #include <linux/of.h> | |
17 | #include <linux/of_address.h> | |
18 | ||
19 | #define NUM_CHANNEL 8 | |
20 | #define MAX_INPUT_MUX 256 | |
21 | ||
22 | #define REG_EDGE_POL 0x00 | |
23 | #define REG_PIN_03_SEL 0x04 | |
24 | #define REG_PIN_47_SEL 0x08 | |
25 | #define REG_FILTER_SEL 0x0c | |
26 | ||
27 | #define REG_EDGE_POL_MASK(x) (BIT(x) | BIT(16 + (x))) | |
28 | #define REG_EDGE_POL_EDGE(x) BIT(x) | |
29 | #define REG_EDGE_POL_LOW(x) BIT(16 + (x)) | |
30 | #define REG_PIN_SEL_SHIFT(x) (((x) % 4) * 8) | |
31 | #define REG_FILTER_SEL_SHIFT(x) ((x) * 4) | |
32 | ||
33 | struct meson_gpio_irq_params { | |
34 | unsigned int nr_hwirq; | |
35 | }; | |
36 | ||
4e4cb1b1 MB |
37 | static const struct meson_gpio_irq_params meson8_params = { |
38 | .nr_hwirq = 134, | |
39 | }; | |
40 | ||
215f4cc0 JB |
41 | static const struct meson_gpio_irq_params meson8b_params = { |
42 | .nr_hwirq = 119, | |
43 | }; | |
44 | ||
45 | static const struct meson_gpio_irq_params gxbb_params = { | |
46 | .nr_hwirq = 133, | |
47 | }; | |
48 | ||
49 | static const struct meson_gpio_irq_params gxl_params = { | |
50 | .nr_hwirq = 110, | |
51 | }; | |
52 | ||
868c4e07 YL |
53 | static const struct meson_gpio_irq_params axg_params = { |
54 | .nr_hwirq = 100, | |
55 | }; | |
56 | ||
215f4cc0 | 57 | static const struct of_device_id meson_irq_gpio_matches[] = { |
4e4cb1b1 | 58 | { .compatible = "amlogic,meson8-gpio-intc", .data = &meson8_params }, |
215f4cc0 JB |
59 | { .compatible = "amlogic,meson8b-gpio-intc", .data = &meson8b_params }, |
60 | { .compatible = "amlogic,meson-gxbb-gpio-intc", .data = &gxbb_params }, | |
61 | { .compatible = "amlogic,meson-gxl-gpio-intc", .data = &gxl_params }, | |
868c4e07 | 62 | { .compatible = "amlogic,meson-axg-gpio-intc", .data = &axg_params }, |
215f4cc0 JB |
63 | { } |
64 | }; | |
65 | ||
66 | struct meson_gpio_irq_controller { | |
67 | unsigned int nr_hwirq; | |
68 | void __iomem *base; | |
69 | u32 channel_irqs[NUM_CHANNEL]; | |
70 | DECLARE_BITMAP(channel_map, NUM_CHANNEL); | |
71 | spinlock_t lock; | |
72 | }; | |
73 | ||
74 | static void meson_gpio_irq_update_bits(struct meson_gpio_irq_controller *ctl, | |
75 | unsigned int reg, u32 mask, u32 val) | |
76 | { | |
77 | u32 tmp; | |
78 | ||
79 | tmp = readl_relaxed(ctl->base + reg); | |
80 | tmp &= ~mask; | |
81 | tmp |= val; | |
82 | writel_relaxed(tmp, ctl->base + reg); | |
83 | } | |
84 | ||
85 | static unsigned int meson_gpio_irq_channel_to_reg(unsigned int channel) | |
86 | { | |
87 | return (channel < 4) ? REG_PIN_03_SEL : REG_PIN_47_SEL; | |
88 | } | |
89 | ||
90 | static int | |
91 | meson_gpio_irq_request_channel(struct meson_gpio_irq_controller *ctl, | |
92 | unsigned long hwirq, | |
93 | u32 **channel_hwirq) | |
94 | { | |
95 | unsigned int reg, idx; | |
96 | ||
97 | spin_lock(&ctl->lock); | |
98 | ||
99 | /* Find a free channel */ | |
100 | idx = find_first_zero_bit(ctl->channel_map, NUM_CHANNEL); | |
101 | if (idx >= NUM_CHANNEL) { | |
102 | spin_unlock(&ctl->lock); | |
103 | pr_err("No channel available\n"); | |
104 | return -ENOSPC; | |
105 | } | |
106 | ||
107 | /* Mark the channel as used */ | |
108 | set_bit(idx, ctl->channel_map); | |
109 | ||
110 | /* | |
111 | * Setup the mux of the channel to route the signal of the pad | |
112 | * to the appropriate input of the GIC | |
113 | */ | |
114 | reg = meson_gpio_irq_channel_to_reg(idx); | |
115 | meson_gpio_irq_update_bits(ctl, reg, | |
116 | 0xff << REG_PIN_SEL_SHIFT(idx), | |
117 | hwirq << REG_PIN_SEL_SHIFT(idx)); | |
118 | ||
119 | /* | |
120 | * Get the hwirq number assigned to this channel through | |
121 | * a pointer the channel_irq table. The added benifit of this | |
122 | * method is that we can also retrieve the channel index with | |
123 | * it, using the table base. | |
124 | */ | |
125 | *channel_hwirq = &(ctl->channel_irqs[idx]); | |
126 | ||
127 | spin_unlock(&ctl->lock); | |
128 | ||
129 | pr_debug("hwirq %lu assigned to channel %d - irq %u\n", | |
130 | hwirq, idx, **channel_hwirq); | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | static unsigned int | |
136 | meson_gpio_irq_get_channel_idx(struct meson_gpio_irq_controller *ctl, | |
137 | u32 *channel_hwirq) | |
138 | { | |
139 | return channel_hwirq - ctl->channel_irqs; | |
140 | } | |
141 | ||
142 | static void | |
143 | meson_gpio_irq_release_channel(struct meson_gpio_irq_controller *ctl, | |
144 | u32 *channel_hwirq) | |
145 | { | |
146 | unsigned int idx; | |
147 | ||
148 | idx = meson_gpio_irq_get_channel_idx(ctl, channel_hwirq); | |
149 | clear_bit(idx, ctl->channel_map); | |
150 | } | |
151 | ||
152 | static int meson_gpio_irq_type_setup(struct meson_gpio_irq_controller *ctl, | |
153 | unsigned int type, | |
154 | u32 *channel_hwirq) | |
155 | { | |
156 | u32 val = 0; | |
157 | unsigned int idx; | |
158 | ||
159 | idx = meson_gpio_irq_get_channel_idx(ctl, channel_hwirq); | |
160 | ||
161 | /* | |
162 | * The controller has a filter block to operate in either LEVEL or | |
163 | * EDGE mode, then signal is sent to the GIC. To enable LEVEL_LOW and | |
164 | * EDGE_FALLING support (which the GIC does not support), the filter | |
165 | * block is also able to invert the input signal it gets before | |
166 | * providing it to the GIC. | |
167 | */ | |
168 | type &= IRQ_TYPE_SENSE_MASK; | |
169 | ||
170 | if (type == IRQ_TYPE_EDGE_BOTH) | |
171 | return -EINVAL; | |
172 | ||
173 | if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) | |
174 | val |= REG_EDGE_POL_EDGE(idx); | |
175 | ||
176 | if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING)) | |
177 | val |= REG_EDGE_POL_LOW(idx); | |
178 | ||
179 | spin_lock(&ctl->lock); | |
180 | ||
181 | meson_gpio_irq_update_bits(ctl, REG_EDGE_POL, | |
182 | REG_EDGE_POL_MASK(idx), val); | |
183 | ||
184 | spin_unlock(&ctl->lock); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | static unsigned int meson_gpio_irq_type_output(unsigned int type) | |
190 | { | |
191 | unsigned int sense = type & IRQ_TYPE_SENSE_MASK; | |
192 | ||
193 | type &= ~IRQ_TYPE_SENSE_MASK; | |
194 | ||
195 | /* | |
196 | * The polarity of the signal provided to the GIC should always | |
197 | * be high. | |
198 | */ | |
199 | if (sense & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) | |
200 | type |= IRQ_TYPE_LEVEL_HIGH; | |
201 | else if (sense & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) | |
202 | type |= IRQ_TYPE_EDGE_RISING; | |
203 | ||
204 | return type; | |
205 | } | |
206 | ||
207 | static int meson_gpio_irq_set_type(struct irq_data *data, unsigned int type) | |
208 | { | |
209 | struct meson_gpio_irq_controller *ctl = data->domain->host_data; | |
210 | u32 *channel_hwirq = irq_data_get_irq_chip_data(data); | |
211 | int ret; | |
212 | ||
213 | ret = meson_gpio_irq_type_setup(ctl, type, channel_hwirq); | |
214 | if (ret) | |
215 | return ret; | |
216 | ||
217 | return irq_chip_set_type_parent(data, | |
218 | meson_gpio_irq_type_output(type)); | |
219 | } | |
220 | ||
221 | static struct irq_chip meson_gpio_irq_chip = { | |
222 | .name = "meson-gpio-irqchip", | |
223 | .irq_mask = irq_chip_mask_parent, | |
224 | .irq_unmask = irq_chip_unmask_parent, | |
225 | .irq_eoi = irq_chip_eoi_parent, | |
226 | .irq_set_type = meson_gpio_irq_set_type, | |
227 | .irq_retrigger = irq_chip_retrigger_hierarchy, | |
228 | #ifdef CONFIG_SMP | |
229 | .irq_set_affinity = irq_chip_set_affinity_parent, | |
230 | #endif | |
231 | .flags = IRQCHIP_SET_TYPE_MASKED, | |
232 | }; | |
233 | ||
234 | static int meson_gpio_irq_domain_translate(struct irq_domain *domain, | |
235 | struct irq_fwspec *fwspec, | |
236 | unsigned long *hwirq, | |
237 | unsigned int *type) | |
238 | { | |
239 | if (is_of_node(fwspec->fwnode) && fwspec->param_count == 2) { | |
240 | *hwirq = fwspec->param[0]; | |
241 | *type = fwspec->param[1]; | |
242 | return 0; | |
243 | } | |
244 | ||
245 | return -EINVAL; | |
246 | } | |
247 | ||
248 | static int meson_gpio_irq_allocate_gic_irq(struct irq_domain *domain, | |
249 | unsigned int virq, | |
250 | u32 hwirq, | |
251 | unsigned int type) | |
252 | { | |
253 | struct irq_fwspec fwspec; | |
254 | ||
255 | fwspec.fwnode = domain->parent->fwnode; | |
256 | fwspec.param_count = 3; | |
257 | fwspec.param[0] = 0; /* SPI */ | |
258 | fwspec.param[1] = hwirq; | |
259 | fwspec.param[2] = meson_gpio_irq_type_output(type); | |
260 | ||
261 | return irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec); | |
262 | } | |
263 | ||
264 | static int meson_gpio_irq_domain_alloc(struct irq_domain *domain, | |
265 | unsigned int virq, | |
266 | unsigned int nr_irqs, | |
267 | void *data) | |
268 | { | |
269 | struct irq_fwspec *fwspec = data; | |
270 | struct meson_gpio_irq_controller *ctl = domain->host_data; | |
271 | unsigned long hwirq; | |
272 | u32 *channel_hwirq; | |
273 | unsigned int type; | |
274 | int ret; | |
275 | ||
276 | if (WARN_ON(nr_irqs != 1)) | |
277 | return -EINVAL; | |
278 | ||
279 | ret = meson_gpio_irq_domain_translate(domain, fwspec, &hwirq, &type); | |
280 | if (ret) | |
281 | return ret; | |
282 | ||
283 | ret = meson_gpio_irq_request_channel(ctl, hwirq, &channel_hwirq); | |
284 | if (ret) | |
285 | return ret; | |
286 | ||
287 | ret = meson_gpio_irq_allocate_gic_irq(domain, virq, | |
288 | *channel_hwirq, type); | |
289 | if (ret < 0) { | |
290 | pr_err("failed to allocate gic irq %u\n", *channel_hwirq); | |
291 | meson_gpio_irq_release_channel(ctl, channel_hwirq); | |
292 | return ret; | |
293 | } | |
294 | ||
295 | irq_domain_set_hwirq_and_chip(domain, virq, hwirq, | |
296 | &meson_gpio_irq_chip, channel_hwirq); | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | static void meson_gpio_irq_domain_free(struct irq_domain *domain, | |
302 | unsigned int virq, | |
303 | unsigned int nr_irqs) | |
304 | { | |
305 | struct meson_gpio_irq_controller *ctl = domain->host_data; | |
306 | struct irq_data *irq_data; | |
307 | u32 *channel_hwirq; | |
308 | ||
309 | if (WARN_ON(nr_irqs != 1)) | |
310 | return; | |
311 | ||
312 | irq_domain_free_irqs_parent(domain, virq, 1); | |
313 | ||
314 | irq_data = irq_domain_get_irq_data(domain, virq); | |
315 | channel_hwirq = irq_data_get_irq_chip_data(irq_data); | |
316 | ||
317 | meson_gpio_irq_release_channel(ctl, channel_hwirq); | |
318 | } | |
319 | ||
320 | static const struct irq_domain_ops meson_gpio_irq_domain_ops = { | |
321 | .alloc = meson_gpio_irq_domain_alloc, | |
322 | .free = meson_gpio_irq_domain_free, | |
323 | .translate = meson_gpio_irq_domain_translate, | |
324 | }; | |
325 | ||
326 | static int __init meson_gpio_irq_parse_dt(struct device_node *node, | |
327 | struct meson_gpio_irq_controller *ctl) | |
328 | { | |
329 | const struct of_device_id *match; | |
330 | const struct meson_gpio_irq_params *params; | |
331 | int ret; | |
332 | ||
333 | match = of_match_node(meson_irq_gpio_matches, node); | |
334 | if (!match) | |
335 | return -ENODEV; | |
336 | ||
337 | params = match->data; | |
338 | ctl->nr_hwirq = params->nr_hwirq; | |
339 | ||
340 | ret = of_property_read_variable_u32_array(node, | |
341 | "amlogic,channel-interrupts", | |
342 | ctl->channel_irqs, | |
343 | NUM_CHANNEL, | |
344 | NUM_CHANNEL); | |
345 | if (ret < 0) { | |
346 | pr_err("can't get %d channel interrupts\n", NUM_CHANNEL); | |
347 | return ret; | |
348 | } | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | static int __init meson_gpio_irq_of_init(struct device_node *node, | |
354 | struct device_node *parent) | |
355 | { | |
356 | struct irq_domain *domain, *parent_domain; | |
357 | struct meson_gpio_irq_controller *ctl; | |
358 | int ret; | |
359 | ||
360 | if (!parent) { | |
361 | pr_err("missing parent interrupt node\n"); | |
362 | return -ENODEV; | |
363 | } | |
364 | ||
365 | parent_domain = irq_find_host(parent); | |
366 | if (!parent_domain) { | |
367 | pr_err("unable to obtain parent domain\n"); | |
368 | return -ENXIO; | |
369 | } | |
370 | ||
371 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); | |
372 | if (!ctl) | |
373 | return -ENOMEM; | |
374 | ||
375 | spin_lock_init(&ctl->lock); | |
376 | ||
377 | ctl->base = of_iomap(node, 0); | |
378 | if (!ctl->base) { | |
379 | ret = -ENOMEM; | |
380 | goto free_ctl; | |
381 | } | |
382 | ||
383 | ret = meson_gpio_irq_parse_dt(node, ctl); | |
384 | if (ret) | |
385 | goto free_channel_irqs; | |
386 | ||
387 | domain = irq_domain_create_hierarchy(parent_domain, 0, ctl->nr_hwirq, | |
388 | of_node_to_fwnode(node), | |
389 | &meson_gpio_irq_domain_ops, | |
390 | ctl); | |
391 | if (!domain) { | |
392 | pr_err("failed to add domain\n"); | |
393 | ret = -ENODEV; | |
394 | goto free_channel_irqs; | |
395 | } | |
396 | ||
397 | pr_info("%d to %d gpio interrupt mux initialized\n", | |
398 | ctl->nr_hwirq, NUM_CHANNEL); | |
399 | ||
400 | return 0; | |
401 | ||
402 | free_channel_irqs: | |
403 | iounmap(ctl->base); | |
404 | free_ctl: | |
405 | kfree(ctl); | |
406 | ||
407 | return ret; | |
408 | } | |
409 | ||
410 | IRQCHIP_DECLARE(meson_gpio_intc, "amlogic,meson-gpio-intc", | |
411 | meson_gpio_irq_of_init); |