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1/*
2 * Copyright (c) 2015 Endless Mobile, Inc.
3 * Author: Carlo Caione <carlo@endlessm.com>
4 * Copyright (c) 2016 BayLibre, SAS.
5 * Author: Jerome Brunet <jbrunet@baylibre.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 * The full GNU General Public License is included in this distribution
19 * in the file called COPYING.
20 */
21
22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24#include <linux/io.h>
25#include <linux/module.h>
26#include <linux/irq.h>
27#include <linux/irqdomain.h>
28#include <linux/irqchip.h>
29#include <linux/of.h>
30#include <linux/of_address.h>
31
32#define NUM_CHANNEL 8
33#define MAX_INPUT_MUX 256
34
35#define REG_EDGE_POL 0x00
36#define REG_PIN_03_SEL 0x04
37#define REG_PIN_47_SEL 0x08
38#define REG_FILTER_SEL 0x0c
39
40#define REG_EDGE_POL_MASK(x) (BIT(x) | BIT(16 + (x)))
41#define REG_EDGE_POL_EDGE(x) BIT(x)
42#define REG_EDGE_POL_LOW(x) BIT(16 + (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_params {
47 unsigned int nr_hwirq;
48};
49
50static const struct meson_gpio_irq_params meson8_params = {
51 .nr_hwirq = 134,
52};
53
54static const struct meson_gpio_irq_params meson8b_params = {
55 .nr_hwirq = 119,
56};
57
58static const struct meson_gpio_irq_params gxbb_params = {
59 .nr_hwirq = 133,
60};
61
62static const struct meson_gpio_irq_params gxl_params = {
63 .nr_hwirq = 110,
64};
65
66static const struct meson_gpio_irq_params axg_params = {
67 .nr_hwirq = 100,
68};
69
70static const struct of_device_id meson_irq_gpio_matches[] = {
71 { .compatible = "amlogic,meson8-gpio-intc", .data = &meson8_params },
72 { .compatible = "amlogic,meson8b-gpio-intc", .data = &meson8b_params },
73 { .compatible = "amlogic,meson-gxbb-gpio-intc", .data = &gxbb_params },
74 { .compatible = "amlogic,meson-gxl-gpio-intc", .data = &gxl_params },
75 { .compatible = "amlogic,meson-axg-gpio-intc", .data = &axg_params },
76 { }
77};
78
79struct meson_gpio_irq_controller {
80 unsigned int nr_hwirq;
81 void __iomem *base;
82 u32 channel_irqs[NUM_CHANNEL];
83 DECLARE_BITMAP(channel_map, NUM_CHANNEL);
84 spinlock_t lock;
85};
86
87static void meson_gpio_irq_update_bits(struct meson_gpio_irq_controller *ctl,
88 unsigned int reg, u32 mask, u32 val)
89{
90 u32 tmp;
91
92 tmp = readl_relaxed(ctl->base + reg);
93 tmp &= ~mask;
94 tmp |= val;
95 writel_relaxed(tmp, ctl->base + reg);
96}
97
98static unsigned int meson_gpio_irq_channel_to_reg(unsigned int channel)
99{
100 return (channel < 4) ? REG_PIN_03_SEL : REG_PIN_47_SEL;
101}
102
103static int
104meson_gpio_irq_request_channel(struct meson_gpio_irq_controller *ctl,
105 unsigned long hwirq,
106 u32 **channel_hwirq)
107{
108 unsigned int reg, idx;
109
110 spin_lock(&ctl->lock);
111
112 /* Find a free channel */
113 idx = find_first_zero_bit(ctl->channel_map, NUM_CHANNEL);
114 if (idx >= NUM_CHANNEL) {
115 spin_unlock(&ctl->lock);
116 pr_err("No channel available\n");
117 return -ENOSPC;
118 }
119
120 /* Mark the channel as used */
121 set_bit(idx, ctl->channel_map);
122
123 /*
124 * Setup the mux of the channel to route the signal of the pad
125 * to the appropriate input of the GIC
126 */
127 reg = meson_gpio_irq_channel_to_reg(idx);
128 meson_gpio_irq_update_bits(ctl, reg,
129 0xff << REG_PIN_SEL_SHIFT(idx),
130 hwirq << REG_PIN_SEL_SHIFT(idx));
131
132 /*
133 * Get the hwirq number assigned to this channel through
134 * a pointer the channel_irq table. The added benifit of this
135 * method is that we can also retrieve the channel index with
136 * it, using the table base.
137 */
138 *channel_hwirq = &(ctl->channel_irqs[idx]);
139
140 spin_unlock(&ctl->lock);
141
142 pr_debug("hwirq %lu assigned to channel %d - irq %u\n",
143 hwirq, idx, **channel_hwirq);
144
145 return 0;
146}
147
148static unsigned int
149meson_gpio_irq_get_channel_idx(struct meson_gpio_irq_controller *ctl,
150 u32 *channel_hwirq)
151{
152 return channel_hwirq - ctl->channel_irqs;
153}
154
155static void
156meson_gpio_irq_release_channel(struct meson_gpio_irq_controller *ctl,
157 u32 *channel_hwirq)
158{
159 unsigned int idx;
160
161 idx = meson_gpio_irq_get_channel_idx(ctl, channel_hwirq);
162 clear_bit(idx, ctl->channel_map);
163}
164
165static int meson_gpio_irq_type_setup(struct meson_gpio_irq_controller *ctl,
166 unsigned int type,
167 u32 *channel_hwirq)
168{
169 u32 val = 0;
170 unsigned int idx;
171
172 idx = meson_gpio_irq_get_channel_idx(ctl, channel_hwirq);
173
174 /*
175 * The controller has a filter block to operate in either LEVEL or
176 * EDGE mode, then signal is sent to the GIC. To enable LEVEL_LOW and
177 * EDGE_FALLING support (which the GIC does not support), the filter
178 * block is also able to invert the input signal it gets before
179 * providing it to the GIC.
180 */
181 type &= IRQ_TYPE_SENSE_MASK;
182
183 if (type == IRQ_TYPE_EDGE_BOTH)
184 return -EINVAL;
185
186 if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
187 val |= REG_EDGE_POL_EDGE(idx);
188
189 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING))
190 val |= REG_EDGE_POL_LOW(idx);
191
192 spin_lock(&ctl->lock);
193
194 meson_gpio_irq_update_bits(ctl, REG_EDGE_POL,
195 REG_EDGE_POL_MASK(idx), val);
196
197 spin_unlock(&ctl->lock);
198
199 return 0;
200}
201
202static unsigned int meson_gpio_irq_type_output(unsigned int type)
203{
204 unsigned int sense = type & IRQ_TYPE_SENSE_MASK;
205
206 type &= ~IRQ_TYPE_SENSE_MASK;
207
208 /*
209 * The polarity of the signal provided to the GIC should always
210 * be high.
211 */
212 if (sense & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
213 type |= IRQ_TYPE_LEVEL_HIGH;
214 else if (sense & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
215 type |= IRQ_TYPE_EDGE_RISING;
216
217 return type;
218}
219
220static int meson_gpio_irq_set_type(struct irq_data *data, unsigned int type)
221{
222 struct meson_gpio_irq_controller *ctl = data->domain->host_data;
223 u32 *channel_hwirq = irq_data_get_irq_chip_data(data);
224 int ret;
225
226 ret = meson_gpio_irq_type_setup(ctl, type, channel_hwirq);
227 if (ret)
228 return ret;
229
230 return irq_chip_set_type_parent(data,
231 meson_gpio_irq_type_output(type));
232}
233
234static struct irq_chip meson_gpio_irq_chip = {
235 .name = "meson-gpio-irqchip",
236 .irq_mask = irq_chip_mask_parent,
237 .irq_unmask = irq_chip_unmask_parent,
238 .irq_eoi = irq_chip_eoi_parent,
239 .irq_set_type = meson_gpio_irq_set_type,
240 .irq_retrigger = irq_chip_retrigger_hierarchy,
241#ifdef CONFIG_SMP
242 .irq_set_affinity = irq_chip_set_affinity_parent,
243#endif
244 .flags = IRQCHIP_SET_TYPE_MASKED,
245};
246
247static int meson_gpio_irq_domain_translate(struct irq_domain *domain,
248 struct irq_fwspec *fwspec,
249 unsigned long *hwirq,
250 unsigned int *type)
251{
252 if (is_of_node(fwspec->fwnode) && fwspec->param_count == 2) {
253 *hwirq = fwspec->param[0];
254 *type = fwspec->param[1];
255 return 0;
256 }
257
258 return -EINVAL;
259}
260
261static int meson_gpio_irq_allocate_gic_irq(struct irq_domain *domain,
262 unsigned int virq,
263 u32 hwirq,
264 unsigned int type)
265{
266 struct irq_fwspec fwspec;
267
268 fwspec.fwnode = domain->parent->fwnode;
269 fwspec.param_count = 3;
270 fwspec.param[0] = 0; /* SPI */
271 fwspec.param[1] = hwirq;
272 fwspec.param[2] = meson_gpio_irq_type_output(type);
273
274 return irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
275}
276
277static int meson_gpio_irq_domain_alloc(struct irq_domain *domain,
278 unsigned int virq,
279 unsigned int nr_irqs,
280 void *data)
281{
282 struct irq_fwspec *fwspec = data;
283 struct meson_gpio_irq_controller *ctl = domain->host_data;
284 unsigned long hwirq;
285 u32 *channel_hwirq;
286 unsigned int type;
287 int ret;
288
289 if (WARN_ON(nr_irqs != 1))
290 return -EINVAL;
291
292 ret = meson_gpio_irq_domain_translate(domain, fwspec, &hwirq, &type);
293 if (ret)
294 return ret;
295
296 ret = meson_gpio_irq_request_channel(ctl, hwirq, &channel_hwirq);
297 if (ret)
298 return ret;
299
300 ret = meson_gpio_irq_allocate_gic_irq(domain, virq,
301 *channel_hwirq, type);
302 if (ret < 0) {
303 pr_err("failed to allocate gic irq %u\n", *channel_hwirq);
304 meson_gpio_irq_release_channel(ctl, channel_hwirq);
305 return ret;
306 }
307
308 irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
309 &meson_gpio_irq_chip, channel_hwirq);
310
311 return 0;
312}
313
314static void meson_gpio_irq_domain_free(struct irq_domain *domain,
315 unsigned int virq,
316 unsigned int nr_irqs)
317{
318 struct meson_gpio_irq_controller *ctl = domain->host_data;
319 struct irq_data *irq_data;
320 u32 *channel_hwirq;
321
322 if (WARN_ON(nr_irqs != 1))
323 return;
324
325 irq_domain_free_irqs_parent(domain, virq, 1);
326
327 irq_data = irq_domain_get_irq_data(domain, virq);
328 channel_hwirq = irq_data_get_irq_chip_data(irq_data);
329
330 meson_gpio_irq_release_channel(ctl, channel_hwirq);
331}
332
333static const struct irq_domain_ops meson_gpio_irq_domain_ops = {
334 .alloc = meson_gpio_irq_domain_alloc,
335 .free = meson_gpio_irq_domain_free,
336 .translate = meson_gpio_irq_domain_translate,
337};
338
339static int __init meson_gpio_irq_parse_dt(struct device_node *node,
340 struct meson_gpio_irq_controller *ctl)
341{
342 const struct of_device_id *match;
343 const struct meson_gpio_irq_params *params;
344 int ret;
345
346 match = of_match_node(meson_irq_gpio_matches, node);
347 if (!match)
348 return -ENODEV;
349
350 params = match->data;
351 ctl->nr_hwirq = params->nr_hwirq;
352
353 ret = of_property_read_variable_u32_array(node,
354 "amlogic,channel-interrupts",
355 ctl->channel_irqs,
356 NUM_CHANNEL,
357 NUM_CHANNEL);
358 if (ret < 0) {
359 pr_err("can't get %d channel interrupts\n", NUM_CHANNEL);
360 return ret;
361 }
362
363 return 0;
364}
365
366static int __init meson_gpio_irq_of_init(struct device_node *node,
367 struct device_node *parent)
368{
369 struct irq_domain *domain, *parent_domain;
370 struct meson_gpio_irq_controller *ctl;
371 int ret;
372
373 if (!parent) {
374 pr_err("missing parent interrupt node\n");
375 return -ENODEV;
376 }
377
378 parent_domain = irq_find_host(parent);
379 if (!parent_domain) {
380 pr_err("unable to obtain parent domain\n");
381 return -ENXIO;
382 }
383
384 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
385 if (!ctl)
386 return -ENOMEM;
387
388 spin_lock_init(&ctl->lock);
389
390 ctl->base = of_iomap(node, 0);
391 if (!ctl->base) {
392 ret = -ENOMEM;
393 goto free_ctl;
394 }
395
396 ret = meson_gpio_irq_parse_dt(node, ctl);
397 if (ret)
398 goto free_channel_irqs;
399
400 domain = irq_domain_create_hierarchy(parent_domain, 0, ctl->nr_hwirq,
401 of_node_to_fwnode(node),
402 &meson_gpio_irq_domain_ops,
403 ctl);
404 if (!domain) {
405 pr_err("failed to add domain\n");
406 ret = -ENODEV;
407 goto free_channel_irqs;
408 }
409
410 pr_info("%d to %d gpio interrupt mux initialized\n",
411 ctl->nr_hwirq, NUM_CHANNEL);
412
413 return 0;
414
415free_channel_irqs:
416 iounmap(ctl->base);
417free_ctl:
418 kfree(ctl);
419
420 return ret;
421}
422
423IRQCHIP_DECLARE(meson_gpio_intc, "amlogic,meson-gpio-intc",
424 meson_gpio_irq_of_init);
425

Warning: That file was not part of the compilation database. It may have many parsing errors.