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2024-01-31 f70575805708cabdedea7498aaa3f710fde4d920 
 kernel/drivers/irqchip/irq-meson-gpio.c
....@@ -1,22 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Copyright (c) 2015 Endless Mobile, Inc.
34  * Author: Carlo Caione <carlo@endlessm.com>
45  * Copyright (c) 2016 BayLibre, SAS.
56  * 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.
207  */
218 
229 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
....@@ -28,6 +15,7 @@
2815 #include <linux/irqchip.h>
2916 #include <linux/of.h>
3017 #include <linux/of_address.h>
18
+#include <linux/of_irq.h>
3119 
3220 #define NUM_CHANNEL 8
3321 #define MAX_INPUT_MUX 256
....@@ -37,34 +25,101 @@
3725 #define REG_PIN_47_SEL	0x08
3826 #define REG_FILTER_SEL	0x0c
3927 
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))
28
+/* use for A1 like chips */
29
+#define REG_PIN_A1_SEL	0x04
30
+
31
+/*
32
+ * Note: The S905X3 datasheet reports that BOTH_EDGE is controlled by
33
+ * bits 24 to 31. Tests on the actual HW show that these bits are
34
+ * stuck at 0. Bits 8 to 15 are responsive and have the expected
35
+ * effect.
36
+ */
37
+#define REG_EDGE_POL_EDGE(params, x)	BIT((params)->edge_single_offset + (x))
38
+#define REG_EDGE_POL_LOW(params, x)	BIT((params)->pol_low_offset + (x))
39
+#define REG_BOTH_EDGE(params, x)	BIT((params)->edge_both_offset + (x))
40
+#define REG_EDGE_POL_MASK(params, x)    (	\
41
+		REG_EDGE_POL_EDGE(params, x) |	\
42
+		REG_EDGE_POL_LOW(params, x)  |	\
43
+		REG_BOTH_EDGE(params, x))
4344 #define REG_PIN_SEL_SHIFT(x)	(((x) % 4) * 8)
4445 #define REG_FILTER_SEL_SHIFT(x)	((x) * 4)
4546 
46
-struct meson_gpio_irq_params {
47
-	unsigned int nr_hwirq;
47
+struct meson_gpio_irq_controller;
48
+static void meson8_gpio_irq_sel_pin(struct meson_gpio_irq_controller *ctl,
49
+				    unsigned int channel, unsigned long hwirq);
50
+static void meson_gpio_irq_init_dummy(struct meson_gpio_irq_controller *ctl);
51
+static void meson_a1_gpio_irq_sel_pin(struct meson_gpio_irq_controller *ctl,
52
+				      unsigned int channel,
53
+				      unsigned long hwirq);
54
+static void meson_a1_gpio_irq_init(struct meson_gpio_irq_controller *ctl);
55
+
56
+struct irq_ctl_ops {
57
+	void (*gpio_irq_sel_pin)(struct meson_gpio_irq_controller *ctl,
58
+				 unsigned int channel, unsigned long hwirq);
59
+	void (*gpio_irq_init)(struct meson_gpio_irq_controller *ctl);
4860 };
4961 
62
+struct meson_gpio_irq_params {
63
+	unsigned int nr_hwirq;
64
+	bool support_edge_both;
65
+	unsigned int edge_both_offset;
66
+	unsigned int edge_single_offset;
67
+	unsigned int pol_low_offset;
68
+	unsigned int pin_sel_mask;
69
+	struct irq_ctl_ops ops;
70
+};
71
+
72
+#define INIT_MESON_COMMON(irqs, init, sel)			\
73
+	.nr_hwirq = irqs,					\
74
+	.ops = {						\
75
+		.gpio_irq_init = init,				\
76
+		.gpio_irq_sel_pin = sel,			\
77
+	},
78
+
79
+#define INIT_MESON8_COMMON_DATA(irqs)				\
80
+	INIT_MESON_COMMON(irqs, meson_gpio_irq_init_dummy,	\
81
+			  meson8_gpio_irq_sel_pin)		\
82
+	.edge_single_offset = 0,				\
83
+	.pol_low_offset = 16,					\
84
+	.pin_sel_mask = 0xff,					\
85
+
86
+#define INIT_MESON_A1_COMMON_DATA(irqs)				\
87
+	INIT_MESON_COMMON(irqs, meson_a1_gpio_irq_init,		\
88
+			  meson_a1_gpio_irq_sel_pin)		\
89
+	.support_edge_both = true,				\
90
+	.edge_both_offset = 16,					\
91
+	.edge_single_offset = 8,				\
92
+	.pol_low_offset = 0,					\
93
+	.pin_sel_mask = 0x7f,					\
94
+
5095 static const struct meson_gpio_irq_params meson8_params = {
51
-	.nr_hwirq = 134,
96
+	INIT_MESON8_COMMON_DATA(134)
5297 };
5398 
5499 static const struct meson_gpio_irq_params meson8b_params = {
55
-	.nr_hwirq = 119,
100
+	INIT_MESON8_COMMON_DATA(119)
56101 };
57102 
58103 static const struct meson_gpio_irq_params gxbb_params = {
59
-	.nr_hwirq = 133,
104
+	INIT_MESON8_COMMON_DATA(133)
60105 };
61106 
62107 static const struct meson_gpio_irq_params gxl_params = {
63
-	.nr_hwirq = 110,
108
+	INIT_MESON8_COMMON_DATA(110)
64109 };
65110 
66111 static const struct meson_gpio_irq_params axg_params = {
67
-	.nr_hwirq = 100,
112
+	INIT_MESON8_COMMON_DATA(100)
113
+};
114
+
115
+static const struct meson_gpio_irq_params sm1_params = {
116
+	INIT_MESON8_COMMON_DATA(100)
117
+	.support_edge_both = true,
118
+	.edge_both_offset = 8,
119
+};
120
+
121
+static const struct meson_gpio_irq_params a1_params = {
122
+	INIT_MESON_A1_COMMON_DATA(62)
68123 };
69124 
70125 static const struct of_device_id meson_irq_gpio_matches[] = {
....@@ -74,12 +129,15 @@
74129 	{ .compatible = "amlogic,meson-gxl-gpio-intc", .data = &gxl_params },
75130 	{ .compatible = "amlogic,meson-axg-gpio-intc", .data = &axg_params },
76131 	{ .compatible = "amlogic,meson-g12a-gpio-intc", .data = &axg_params },
132
+	{ .compatible = "amlogic,meson-sm1-gpio-intc", .data = &sm1_params },
133
+	{ .compatible = "amlogic,meson-a1-gpio-intc", .data = &a1_params },
77134 	{ }
78135 };
79136 
80137 struct meson_gpio_irq_controller {
81
-	unsigned int nr_hwirq;
138
+	const struct meson_gpio_irq_params *params;
82139 	void __iomem *base;
140
+	struct irq_domain *domain;
83141 	u32 channel_irqs[NUM_CHANNEL];
84142 	DECLARE_BITMAP(channel_map, NUM_CHANNEL);
85143 	spinlock_t lock;
....@@ -88,17 +146,56 @@
88146 static void meson_gpio_irq_update_bits(struct meson_gpio_irq_controller *ctl,
89147 				       unsigned int reg, u32 mask, u32 val)
90148 {
149
+	unsigned long flags;
91150 	u32 tmp;
151
+
152
+	spin_lock_irqsave(&ctl->lock, flags);
92153 
93154 	tmp = readl_relaxed(ctl->base + reg);
94155 	tmp &= ~mask;
95156 	tmp |= val;
96157 	writel_relaxed(tmp, ctl->base + reg);
158
+
159
+	spin_unlock_irqrestore(&ctl->lock, flags);
97160 }
98161 
99
-static unsigned int meson_gpio_irq_channel_to_reg(unsigned int channel)
162
+static void meson_gpio_irq_init_dummy(struct meson_gpio_irq_controller *ctl)
100163 {
101
-	return (channel < 4) ? REG_PIN_03_SEL : REG_PIN_47_SEL;
164
+}
165
+
166
+static void meson8_gpio_irq_sel_pin(struct meson_gpio_irq_controller *ctl,
167
+				    unsigned int channel, unsigned long hwirq)
168
+{
169
+	unsigned int reg_offset;
170
+	unsigned int bit_offset;
171
+
172
+	reg_offset = (channel < 4) ? REG_PIN_03_SEL : REG_PIN_47_SEL;
173
+	bit_offset = REG_PIN_SEL_SHIFT(channel);
174
+
175
+	meson_gpio_irq_update_bits(ctl, reg_offset,
176
+				   ctl->params->pin_sel_mask << bit_offset,
177
+				   hwirq << bit_offset);
178
+}
179
+
180
+static void meson_a1_gpio_irq_sel_pin(struct meson_gpio_irq_controller *ctl,
181
+				      unsigned int channel,
182
+				      unsigned long hwirq)
183
+{
184
+	unsigned int reg_offset;
185
+	unsigned int bit_offset;
186
+
187
+	bit_offset = ((channel % 2) == 0) ? 0 : 16;
188
+	reg_offset = REG_PIN_A1_SEL + ((channel / 2) << 2);
189
+
190
+	meson_gpio_irq_update_bits(ctl, reg_offset,
191
+				   ctl->params->pin_sel_mask << bit_offset,
192
+				   hwirq << bit_offset);
193
+}
194
+
195
+/* For a1 or later chips like a1 there is a switch to enable/disable irq */
196
+static void meson_a1_gpio_irq_init(struct meson_gpio_irq_controller *ctl)
197
+{
198
+	meson_gpio_irq_update_bits(ctl, REG_EDGE_POL, BIT(31), BIT(31));
102199 }
103200 
104201 static int
....@@ -106,14 +203,15 @@
106203 			       unsigned long  hwirq,
107204 			       u32 **channel_hwirq)
108205 {
109
-	unsigned int reg, idx;
206
+	unsigned long flags;
207
+	unsigned int idx;
110208 
111
-	spin_lock(&ctl->lock);
209
+	spin_lock_irqsave(&ctl->lock, flags);
112210 
113211 	/* Find a free channel */
114212 	idx = find_first_zero_bit(ctl->channel_map, NUM_CHANNEL);
115213 	if (idx >= NUM_CHANNEL) {
116
-		spin_unlock(&ctl->lock);
214
+		spin_unlock_irqrestore(&ctl->lock, flags);
117215 		pr_err("No channel available\n");
118216 		return -ENOSPC;
119217 	}
....@@ -121,24 +219,21 @@
121219 	/* Mark the channel as used */
122220 	set_bit(idx, ctl->channel_map);
123221 
222
+	spin_unlock_irqrestore(&ctl->lock, flags);
223
+
124224 	/*
125225 	 * Setup the mux of the channel to route the signal of the pad
126226 	 * to the appropriate input of the GIC
127227 	 */
128
-	reg = meson_gpio_irq_channel_to_reg(idx);
129
-	meson_gpio_irq_update_bits(ctl, reg,
130
-				   0xff << REG_PIN_SEL_SHIFT(idx),
131
-				   hwirq << REG_PIN_SEL_SHIFT(idx));
228
+	ctl->params->ops.gpio_irq_sel_pin(ctl, idx, hwirq);
132229 
133230 	/*
134231 	 * Get the hwirq number assigned to this channel through
135
-	 * a pointer the channel_irq table. The added benifit of this
232
+	 * a pointer the channel_irq table. The added benefit of this
136233 	 * method is that we can also retrieve the channel index with
137234 	 * it, using the table base.
138235 	 */
139236 	*channel_hwirq = &(ctl->channel_irqs[idx]);
140
-
141
-	spin_unlock(&ctl->lock);
142237 
143238 	pr_debug("hwirq %lu assigned to channel %d - irq %u\n",
144239 		 hwirq, idx, **channel_hwirq);
....@@ -169,7 +264,9 @@
169264 {
170265 	u32 val = 0;
171266 	unsigned int idx;
267
+	const struct meson_gpio_irq_params *params;
172268 
269
+	params = ctl->params;
173270 	idx = meson_gpio_irq_get_channel_idx(ctl, channel_hwirq);
174271 
175272 	/*
....@@ -181,21 +278,25 @@
181278 	 */
182279 	type &= IRQ_TYPE_SENSE_MASK;
183280 
184
-	if (type == IRQ_TYPE_EDGE_BOTH)
185
-		return -EINVAL;
281
+	/*
282
+	 * New controller support EDGE_BOTH trigger. This setting takes
283
+	 * precedence over the other edge/polarity settings
284
+	 */
285
+	if (type == IRQ_TYPE_EDGE_BOTH) {
286
+		if (!params->support_edge_both)
287
+			return -EINVAL;
186288 
187
-	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
188
-		val |= REG_EDGE_POL_EDGE(idx);
289
+		val |= REG_BOTH_EDGE(params, idx);
290
+	} else {
291
+		if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
292
+			val |= REG_EDGE_POL_EDGE(params, idx);
189293 
190
-	if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING))
191
-		val |= REG_EDGE_POL_LOW(idx);
192
-
193
-	spin_lock(&ctl->lock);
294
+		if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING))
295
+			val |= REG_EDGE_POL_LOW(params, idx);
296
+	}
194297 
195298 	meson_gpio_irq_update_bits(ctl, REG_EDGE_POL,
196
-				   REG_EDGE_POL_MASK(idx), val);
197
-
198
-	spin_unlock(&ctl->lock);
299
+				   REG_EDGE_POL_MASK(params, idx), val);
199300 
200301 	return 0;
201302 }
....@@ -212,7 +313,7 @@
212313 	 */
213314 	if (sense & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
214315 		type |= IRQ_TYPE_LEVEL_HIGH;
215
-	else if (sense & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
316
+	else
216317 		type |= IRQ_TYPE_EDGE_RISING;
217318 
218319 	return type;
....@@ -337,19 +438,17 @@
337438 	.translate	= meson_gpio_irq_domain_translate,
338439 };
339440 
340
-static int __init meson_gpio_irq_parse_dt(struct device_node *node,
341
-					  struct meson_gpio_irq_controller *ctl)
441
+static int meson_gpio_irq_parse_dt(struct device_node *node,
442
+				   struct meson_gpio_irq_controller *ctl)
342443 {
343444 	const struct of_device_id *match;
344
-	const struct meson_gpio_irq_params *params;
345445 	int ret;
346446 
347447 	match = of_match_node(meson_irq_gpio_matches, node);
348448 	if (!match)
349449 		return -ENODEV;
350450 
351
-	params = match->data;
352
-	ctl->nr_hwirq = params->nr_hwirq;
451
+	ctl->params = match->data;
353452 
354453 	ret = of_property_read_variable_u32_array(node,
355454 						  "amlogic,channel-interrupts",
....@@ -361,65 +460,89 @@
361460 		return ret;
362461 	}
363462 
463
+	ctl->params->ops.gpio_irq_init(ctl);
464
+
364465 	return 0;
365466 }
366467 
367
-static int __init meson_gpio_irq_of_init(struct device_node *node,
368
-					 struct device_node *parent)
468
+static int meson_gpio_intc_probe(struct platform_device *pdev)
369469 {
370
-	struct irq_domain *domain, *parent_domain;
470
+	struct device_node *node = pdev->dev.of_node, *parent;
371471 	struct meson_gpio_irq_controller *ctl;
472
+	struct irq_domain *parent_domain;
473
+	struct resource *res;
372474 	int ret;
373475 
476
+	parent = of_irq_find_parent(node);
374477 	if (!parent) {
375
-		pr_err("missing parent interrupt node\n");
478
+		dev_err(&pdev->dev, "missing parent interrupt node\n");
376479 		return -ENODEV;
377480 	}
378481 
379482 	parent_domain = irq_find_host(parent);
380483 	if (!parent_domain) {
381
-		pr_err("unable to obtain parent domain\n");
484
+		dev_err(&pdev->dev, "unable to obtain parent domain\n");
382485 		return -ENXIO;
383486 	}
384487 
385
-	ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
488
+	ctl = devm_kzalloc(&pdev->dev, sizeof(*ctl), GFP_KERNEL);
386489 	if (!ctl)
387490 		return -ENOMEM;
388491 
389492 	spin_lock_init(&ctl->lock);
390493 
391
-	ctl->base = of_iomap(node, 0);
392
-	if (!ctl->base) {
393
-		ret = -ENOMEM;
394
-		goto free_ctl;
395
-	}
494
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
495
+	ctl->base = devm_ioremap_resource(&pdev->dev, res);
496
+	if (IS_ERR(ctl->base))
497
+		return PTR_ERR(ctl->base);
396498 
397499 	ret = meson_gpio_irq_parse_dt(node, ctl);
398500 	if (ret)
399
-		goto free_channel_irqs;
501
+		return ret;
400502 
401
-	domain = irq_domain_create_hierarchy(parent_domain, 0, ctl->nr_hwirq,
402
-					     of_node_to_fwnode(node),
403
-					     &meson_gpio_irq_domain_ops,
404
-					     ctl);
405
-	if (!domain) {
406
-		pr_err("failed to add domain\n");
407
-		ret = -ENODEV;
408
-		goto free_channel_irqs;
503
+	ctl->domain = irq_domain_create_hierarchy(parent_domain, 0,
504
+						  ctl->params->nr_hwirq,
505
+						  of_node_to_fwnode(node),
506
+						  &meson_gpio_irq_domain_ops,
507
+						  ctl);
508
+	if (!ctl->domain) {
509
+		dev_err(&pdev->dev, "failed to add domain\n");
510
+		return -ENODEV;
409511 	}
410512 
411
-	pr_info("%d to %d gpio interrupt mux initialized\n",
412
-		ctl->nr_hwirq, NUM_CHANNEL);
513
+	platform_set_drvdata(pdev, ctl);
514
+
515
+	dev_info(&pdev->dev, "%d to %d gpio interrupt mux initialized\n",
516
+		 ctl->params->nr_hwirq, NUM_CHANNEL);
413517 
414518 	return 0;
415
-
416
-free_channel_irqs:
417
-	iounmap(ctl->base);
418
-free_ctl:
419
-	kfree(ctl);
420
-
421
-	return ret;
422519 }
423520 
424
-IRQCHIP_DECLARE(meson_gpio_intc, "amlogic,meson-gpio-intc",
425
-		meson_gpio_irq_of_init);
521
+static int meson_gpio_intc_remove(struct platform_device *pdev)
522
+{
523
+	struct meson_gpio_irq_controller *ctl = platform_get_drvdata(pdev);
524
+
525
+	irq_domain_remove(ctl->domain);
526
+
527
+	return 0;
528
+}
529
+
530
+static const struct of_device_id meson_gpio_intc_of_match[] = {
531
+	{ .compatible = "amlogic,meson-gpio-intc", },
532
+	{},
533
+};
534
+MODULE_DEVICE_TABLE(of, meson_gpio_intc_of_match);
535
+
536
+static struct platform_driver meson_gpio_intc_driver = {
537
+	.probe  = meson_gpio_intc_probe,
538
+	.remove = meson_gpio_intc_remove,
539
+	.driver = {
540
+		.name = "meson-gpio-intc",
541
+		.of_match_table = meson_gpio_intc_of_match,
542
+	},
543
+};
544
+module_platform_driver(meson_gpio_intc_driver);
545
+
546
+MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
547
+MODULE_LICENSE("GPL v2");
548
+MODULE_ALIAS("platform:meson-gpio-intc");