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1// SPDX-License-Identifier: GPL-2.0-only
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>
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/* use for A1 like chips */
28#define REG_PIN_A1_SEL 0x04
29
30/*
31 * Note: The S905X3 datasheet reports that BOTH_EDGE is controlled by
32 * bits 24 to 31. Tests on the actual HW show that these bits are
33 * stuck at 0. Bits 8 to 15 are responsive and have the expected
34 * effect.
35 */
36#define REG_EDGE_POL_EDGE(params, x) BIT((params)->edge_single_offset + (x))
37#define REG_EDGE_POL_LOW(params, x) BIT((params)->pol_low_offset + (x))
38#define REG_BOTH_EDGE(params, x) BIT((params)->edge_both_offset + (x))
39#define REG_EDGE_POL_MASK(params, x) ( \
40 REG_EDGE_POL_EDGE(params, x) | \
41 REG_EDGE_POL_LOW(params, x) | \
42 REG_BOTH_EDGE(params, x))
43#define REG_PIN_SEL_SHIFT(x) (((x) % 4) * 8)
44#define REG_FILTER_SEL_SHIFT(x) ((x) * 4)
45
46struct meson_gpio_irq_controller;
47static void meson8_gpio_irq_sel_pin(struct meson_gpio_irq_controller *ctl,
48 unsigned int channel, unsigned long hwirq);
49static void meson_gpio_irq_init_dummy(struct meson_gpio_irq_controller *ctl);
50static void meson_a1_gpio_irq_sel_pin(struct meson_gpio_irq_controller *ctl,
51 unsigned int channel,
52 unsigned long hwirq);
53static void meson_a1_gpio_irq_init(struct meson_gpio_irq_controller *ctl);
54
55struct irq_ctl_ops {
56 void (*gpio_irq_sel_pin)(struct meson_gpio_irq_controller *ctl,
57 unsigned int channel, unsigned long hwirq);
58 void (*gpio_irq_init)(struct meson_gpio_irq_controller *ctl);
59};
60
61struct meson_gpio_irq_params {
62 unsigned int nr_hwirq;
63 bool support_edge_both;
64 unsigned int edge_both_offset;
65 unsigned int edge_single_offset;
66 unsigned int pol_low_offset;
67 unsigned int pin_sel_mask;
68 struct irq_ctl_ops ops;
69};
70
71#define INIT_MESON_COMMON(irqs, init, sel) \
72 .nr_hwirq = irqs, \
73 .ops = { \
74 .gpio_irq_init = init, \
75 .gpio_irq_sel_pin = sel, \
76 },
77
78#define INIT_MESON8_COMMON_DATA(irqs) \
79 INIT_MESON_COMMON(irqs, meson_gpio_irq_init_dummy, \
80 meson8_gpio_irq_sel_pin) \
81 .edge_single_offset = 0, \
82 .pol_low_offset = 16, \
83 .pin_sel_mask = 0xff, \
84
85#define INIT_MESON_A1_COMMON_DATA(irqs) \
86 INIT_MESON_COMMON(irqs, meson_a1_gpio_irq_init, \
87 meson_a1_gpio_irq_sel_pin) \
88 .support_edge_both = true, \
89 .edge_both_offset = 16, \
90 .edge_single_offset = 8, \
91 .pol_low_offset = 0, \
92 .pin_sel_mask = 0x7f, \
93
94static const struct meson_gpio_irq_params meson8_params = {
95 INIT_MESON8_COMMON_DATA(134)
96};
97
98static const struct meson_gpio_irq_params meson8b_params = {
99 INIT_MESON8_COMMON_DATA(119)
100};
101
102static const struct meson_gpio_irq_params gxbb_params = {
103 INIT_MESON8_COMMON_DATA(133)
104};
105
106static const struct meson_gpio_irq_params gxl_params = {
107 INIT_MESON8_COMMON_DATA(110)
108};
109
110static const struct meson_gpio_irq_params axg_params = {
111 INIT_MESON8_COMMON_DATA(100)
112};
113
114static const struct meson_gpio_irq_params sm1_params = {
115 INIT_MESON8_COMMON_DATA(100)
116 .support_edge_both = true,
117 .edge_both_offset = 8,
118};
119
120static const struct meson_gpio_irq_params a1_params = {
121 INIT_MESON_A1_COMMON_DATA(62)
122};
123
124static const struct of_device_id meson_irq_gpio_matches[] = {
125 { .compatible = "amlogic,meson8-gpio-intc", .data = &meson8_params },
126 { .compatible = "amlogic,meson8b-gpio-intc", .data = &meson8b_params },
127 { .compatible = "amlogic,meson-gxbb-gpio-intc", .data = &gxbb_params },
128 { .compatible = "amlogic,meson-gxl-gpio-intc", .data = &gxl_params },
129 { .compatible = "amlogic,meson-axg-gpio-intc", .data = &axg_params },
130 { .compatible = "amlogic,meson-g12a-gpio-intc", .data = &axg_params },
131 { .compatible = "amlogic,meson-sm1-gpio-intc", .data = &sm1_params },
132 { .compatible = "amlogic,meson-a1-gpio-intc", .data = &a1_params },
133 { }
134};
135
136struct meson_gpio_irq_controller {
137 const struct meson_gpio_irq_params *params;
138 void __iomem *base;
139 u32 channel_irqs[NUM_CHANNEL];
140 DECLARE_BITMAP(channel_map, NUM_CHANNEL);
141 spinlock_t lock;
142};
143
144static void meson_gpio_irq_update_bits(struct meson_gpio_irq_controller *ctl,
145 unsigned int reg, u32 mask, u32 val)
146{
147 unsigned long flags;
148 u32 tmp;
149
150 spin_lock_irqsave(&ctl->lock, flags);
151
152 tmp = readl_relaxed(ctl->base + reg);
153 tmp &= ~mask;
154 tmp |= val;
155 writel_relaxed(tmp, ctl->base + reg);
156
157 spin_unlock_irqrestore(&ctl->lock, flags);
158}
159
160static void meson_gpio_irq_init_dummy(struct meson_gpio_irq_controller *ctl)
161{
162}
163
164static void meson8_gpio_irq_sel_pin(struct meson_gpio_irq_controller *ctl,
165 unsigned int channel, unsigned long hwirq)
166{
167 unsigned int reg_offset;
168 unsigned int bit_offset;
169
170 reg_offset = (channel < 4) ? REG_PIN_03_SEL : REG_PIN_47_SEL;
171 bit_offset = REG_PIN_SEL_SHIFT(channel);
172
173 meson_gpio_irq_update_bits(ctl, reg_offset,
174 ctl->params->pin_sel_mask << bit_offset,
175 hwirq << bit_offset);
176}
177
178static void meson_a1_gpio_irq_sel_pin(struct meson_gpio_irq_controller *ctl,
179 unsigned int channel,
180 unsigned long hwirq)
181{
182 unsigned int reg_offset;
183 unsigned int bit_offset;
184
185 bit_offset = ((channel % 2) == 0) ? 0 : 16;
186 reg_offset = REG_PIN_A1_SEL + ((channel / 2) << 2);
187
188 meson_gpio_irq_update_bits(ctl, reg_offset,
189 ctl->params->pin_sel_mask << bit_offset,
190 hwirq << bit_offset);
191}
192
193/* For a1 or later chips like a1 there is a switch to enable/disable irq */
194static void meson_a1_gpio_irq_init(struct meson_gpio_irq_controller *ctl)
195{
196 meson_gpio_irq_update_bits(ctl, REG_EDGE_POL, BIT(31), BIT(31));
197}
198
199static int
200meson_gpio_irq_request_channel(struct meson_gpio_irq_controller *ctl,
201 unsigned long hwirq,
202 u32 **channel_hwirq)
203{
204 unsigned long flags;
205 unsigned int idx;
206
207 spin_lock_irqsave(&ctl->lock, flags);
208
209 /* Find a free channel */
210 idx = find_first_zero_bit(ctl->channel_map, NUM_CHANNEL);
211 if (idx >= NUM_CHANNEL) {
212 spin_unlock_irqrestore(&ctl->lock, flags);
213 pr_err("No channel available\n");
214 return -ENOSPC;
215 }
216
217 /* Mark the channel as used */
218 set_bit(idx, ctl->channel_map);
219
220 spin_unlock_irqrestore(&ctl->lock, flags);
221
222 /*
223 * Setup the mux of the channel to route the signal of the pad
224 * to the appropriate input of the GIC
225 */
226 ctl->params->ops.gpio_irq_sel_pin(ctl, idx, hwirq);
227
228 /*
229 * Get the hwirq number assigned to this channel through
230 * a pointer the channel_irq table. The added benifit of this
231 * method is that we can also retrieve the channel index with
232 * it, using the table base.
233 */
234 *channel_hwirq = &(ctl->channel_irqs[idx]);
235
236 pr_debug("hwirq %lu assigned to channel %d - irq %u\n",
237 hwirq, idx, **channel_hwirq);
238
239 return 0;
240}
241
242static unsigned int
243meson_gpio_irq_get_channel_idx(struct meson_gpio_irq_controller *ctl,
244 u32 *channel_hwirq)
245{
246 return channel_hwirq - ctl->channel_irqs;
247}
248
249static void
250meson_gpio_irq_release_channel(struct meson_gpio_irq_controller *ctl,
251 u32 *channel_hwirq)
252{
253 unsigned int idx;
254
255 idx = meson_gpio_irq_get_channel_idx(ctl, channel_hwirq);
256 clear_bit(idx, ctl->channel_map);
257}
258
259static int meson_gpio_irq_type_setup(struct meson_gpio_irq_controller *ctl,
260 unsigned int type,
261 u32 *channel_hwirq)
262{
263 u32 val = 0;
264 unsigned int idx;
265 const struct meson_gpio_irq_params *params;
266
267 params = ctl->params;
268 idx = meson_gpio_irq_get_channel_idx(ctl, channel_hwirq);
269
270 /*
271 * The controller has a filter block to operate in either LEVEL or
272 * EDGE mode, then signal is sent to the GIC. To enable LEVEL_LOW and
273 * EDGE_FALLING support (which the GIC does not support), the filter
274 * block is also able to invert the input signal it gets before
275 * providing it to the GIC.
276 */
277 type &= IRQ_TYPE_SENSE_MASK;
278
279 /*
280 * New controller support EDGE_BOTH trigger. This setting takes
281 * precedence over the other edge/polarity settings
282 */
283 if (type == IRQ_TYPE_EDGE_BOTH) {
284 if (!params->support_edge_both)
285 return -EINVAL;
286
287 val |= REG_BOTH_EDGE(params, idx);
288 } else {
289 if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
290 val |= REG_EDGE_POL_EDGE(params, idx);
291
292 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING))
293 val |= REG_EDGE_POL_LOW(params, idx);
294 }
295
296 meson_gpio_irq_update_bits(ctl, REG_EDGE_POL,
297 REG_EDGE_POL_MASK(params, idx), val);
298
299 return 0;
300}
301
302static unsigned int meson_gpio_irq_type_output(unsigned int type)
303{
304 unsigned int sense = type & IRQ_TYPE_SENSE_MASK;
305
306 type &= ~IRQ_TYPE_SENSE_MASK;
307
308 /*
309 * The polarity of the signal provided to the GIC should always
310 * be high.
311 */
312 if (sense & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
313 type |= IRQ_TYPE_LEVEL_HIGH;
314 else
315 type |= IRQ_TYPE_EDGE_RISING;
316
317 return type;
318}
319
320static int meson_gpio_irq_set_type(struct irq_data *data, unsigned int type)
321{
322 struct meson_gpio_irq_controller *ctl = data->domain->host_data;
323 u32 *channel_hwirq = irq_data_get_irq_chip_data(data);
324 int ret;
325
326 ret = meson_gpio_irq_type_setup(ctl, type, channel_hwirq);
327 if (ret)
328 return ret;
329
330 return irq_chip_set_type_parent(data,
331 meson_gpio_irq_type_output(type));
332}
333
334static struct irq_chip meson_gpio_irq_chip = {
335 .name = "meson-gpio-irqchip",
336 .irq_mask = irq_chip_mask_parent,
337 .irq_unmask = irq_chip_unmask_parent,
338 .irq_eoi = irq_chip_eoi_parent,
339 .irq_set_type = meson_gpio_irq_set_type,
340 .irq_retrigger = irq_chip_retrigger_hierarchy,
341#ifdef CONFIG_SMP
342 .irq_set_affinity = irq_chip_set_affinity_parent,
343#endif
344 .flags = IRQCHIP_SET_TYPE_MASKED,
345};
346
347static int meson_gpio_irq_domain_translate(struct irq_domain *domain,
348 struct irq_fwspec *fwspec,
349 unsigned long *hwirq,
350 unsigned int *type)
351{
352 if (is_of_node(fwspec->fwnode) && fwspec->param_count == 2) {
353 *hwirq = fwspec->param[0];
354 *type = fwspec->param[1];
355 return 0;
356 }
357
358 return -EINVAL;
359}
360
361static int meson_gpio_irq_allocate_gic_irq(struct irq_domain *domain,
362 unsigned int virq,
363 u32 hwirq,
364 unsigned int type)
365{
366 struct irq_fwspec fwspec;
367
368 fwspec.fwnode = domain->parent->fwnode;
369 fwspec.param_count = 3;
370 fwspec.param[0] = 0; /* SPI */
371 fwspec.param[1] = hwirq;
372 fwspec.param[2] = meson_gpio_irq_type_output(type);
373
374 return irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
375}
376
377static int meson_gpio_irq_domain_alloc(struct irq_domain *domain,
378 unsigned int virq,
379 unsigned int nr_irqs,
380 void *data)
381{
382 struct irq_fwspec *fwspec = data;
383 struct meson_gpio_irq_controller *ctl = domain->host_data;
384 unsigned long hwirq;
385 u32 *channel_hwirq;
386 unsigned int type;
387 int ret;
388
389 if (WARN_ON(nr_irqs != 1))
390 return -EINVAL;
391
392 ret = meson_gpio_irq_domain_translate(domain, fwspec, &hwirq, &type);
393 if (ret)
394 return ret;
395
396 ret = meson_gpio_irq_request_channel(ctl, hwirq, &channel_hwirq);
397 if (ret)
398 return ret;
399
400 ret = meson_gpio_irq_allocate_gic_irq(domain, virq,
401 *channel_hwirq, type);
402 if (ret < 0) {
403 pr_err("failed to allocate gic irq %u\n", *channel_hwirq);
404 meson_gpio_irq_release_channel(ctl, channel_hwirq);
405 return ret;
406 }
407
408 irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
409 &meson_gpio_irq_chip, channel_hwirq);
410
411 return 0;
412}
413
414static void meson_gpio_irq_domain_free(struct irq_domain *domain,
415 unsigned int virq,
416 unsigned int nr_irqs)
417{
418 struct meson_gpio_irq_controller *ctl = domain->host_data;
419 struct irq_data *irq_data;
420 u32 *channel_hwirq;
421
422 if (WARN_ON(nr_irqs != 1))
423 return;
424
425 irq_domain_free_irqs_parent(domain, virq, 1);
426
427 irq_data = irq_domain_get_irq_data(domain, virq);
428 channel_hwirq = irq_data_get_irq_chip_data(irq_data);
429
430 meson_gpio_irq_release_channel(ctl, channel_hwirq);
431}
432
433static const struct irq_domain_ops meson_gpio_irq_domain_ops = {
434 .alloc = meson_gpio_irq_domain_alloc,
435 .free = meson_gpio_irq_domain_free,
436 .translate = meson_gpio_irq_domain_translate,
437};
438
439static int __init meson_gpio_irq_parse_dt(struct device_node *node,
440 struct meson_gpio_irq_controller *ctl)
441{
442 const struct of_device_id *match;
443 int ret;
444
445 match = of_match_node(meson_irq_gpio_matches, node);
446 if (!match)
447 return -ENODEV;
448
449 ctl->params = match->data;
450
451 ret = of_property_read_variable_u32_array(node,
452 "amlogic,channel-interrupts",
453 ctl->channel_irqs,
454 NUM_CHANNEL,
455 NUM_CHANNEL);
456 if (ret < 0) {
457 pr_err("can't get %d channel interrupts\n", NUM_CHANNEL);
458 return ret;
459 }
460
461 ctl->params->ops.gpio_irq_init(ctl);
462
463 return 0;
464}
465
466static int __init meson_gpio_irq_of_init(struct device_node *node,
467 struct device_node *parent)
468{
469 struct irq_domain *domain, *parent_domain;
470 struct meson_gpio_irq_controller *ctl;
471 int ret;
472
473 if (!parent) {
474 pr_err("missing parent interrupt node\n");
475 return -ENODEV;
476 }
477
478 parent_domain = irq_find_host(parent);
479 if (!parent_domain) {
480 pr_err("unable to obtain parent domain\n");
481 return -ENXIO;
482 }
483
484 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
485 if (!ctl)
486 return -ENOMEM;
487
488 spin_lock_init(&ctl->lock);
489
490 ctl->base = of_iomap(node, 0);
491 if (!ctl->base) {
492 ret = -ENOMEM;
493 goto free_ctl;
494 }
495
496 ret = meson_gpio_irq_parse_dt(node, ctl);
497 if (ret)
498 goto free_channel_irqs;
499
500 domain = irq_domain_create_hierarchy(parent_domain, 0,
501 ctl->params->nr_hwirq,
502 of_node_to_fwnode(node),
503 &meson_gpio_irq_domain_ops,
504 ctl);
505 if (!domain) {
506 pr_err("failed to add domain\n");
507 ret = -ENODEV;
508 goto free_channel_irqs;
509 }
510
511 pr_info("%d to %d gpio interrupt mux initialized\n",
512 ctl->params->nr_hwirq, NUM_CHANNEL);
513
514 return 0;
515
516free_channel_irqs:
517 iounmap(ctl->base);
518free_ctl:
519 kfree(ctl);
520
521 return ret;
522}
523
524IRQCHIP_DECLARE(meson_gpio_intc, "amlogic,meson-gpio-intc",
525 meson_gpio_irq_of_init);