1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Intel Merrifield SoC GPIO driver
4  *
5  * Copyright (c) 2016 Intel Corporation.
6  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
7  */
8 
9 #include <linux/acpi.h>
10 #include <linux/bitops.h>
11 #include <linux/gpio/driver.h>
12 #include <linux/interrupt.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/pci.h>
16 #include <linux/pinctrl/consumer.h>
17 
18 #define GCCR		0x000	/* controller configuration */
19 #define GPLR		0x004	/* pin level r/o */
20 #define GPDR		0x01c	/* pin direction */
21 #define GPSR		0x034	/* pin set w/o */
22 #define GPCR		0x04c	/* pin clear w/o */
23 #define GRER		0x064	/* rising edge detect */
24 #define GFER		0x07c	/* falling edge detect */
25 #define GFBR		0x094	/* glitch filter bypass */
26 #define GIMR		0x0ac	/* interrupt mask */
27 #define GISR		0x0c4	/* interrupt source */
28 #define GITR		0x300	/* input type */
29 #define GLPR		0x318	/* level input polarity */
30 #define GWMR		0x400	/* wake mask */
31 #define GWSR		0x418	/* wake source */
32 #define GSIR		0xc00	/* secure input */
33 
34 /* Intel Merrifield has 192 GPIO pins */
35 #define MRFLD_NGPIO	192
36 
37 struct mrfld_gpio_pinrange {
38 	unsigned int gpio_base;
39 	unsigned int pin_base;
40 	unsigned int npins;
41 };
42 
43 #define GPIO_PINRANGE(gstart, gend, pstart)		\
44 	{						\
45 		.gpio_base = (gstart),			\
46 		.pin_base = (pstart),			\
47 		.npins = (gend) - (gstart) + 1,		\
48 	}
49 
50 struct mrfld_gpio {
51 	struct gpio_chip	chip;
52 	void __iomem		*reg_base;
53 	raw_spinlock_t		lock;
54 	struct device		*dev;
55 };
56 
57 static const struct mrfld_gpio_pinrange mrfld_gpio_ranges[] = {
58 	GPIO_PINRANGE(0, 11, 146),
59 	GPIO_PINRANGE(12, 13, 144),
60 	GPIO_PINRANGE(14, 15, 35),
61 	GPIO_PINRANGE(16, 16, 164),
62 	GPIO_PINRANGE(17, 18, 105),
63 	GPIO_PINRANGE(19, 22, 101),
64 	GPIO_PINRANGE(23, 30, 107),
65 	GPIO_PINRANGE(32, 43, 67),
66 	GPIO_PINRANGE(44, 63, 195),
67 	GPIO_PINRANGE(64, 67, 140),
68 	GPIO_PINRANGE(68, 69, 165),
69 	GPIO_PINRANGE(70, 71, 65),
70 	GPIO_PINRANGE(72, 76, 228),
71 	GPIO_PINRANGE(77, 86, 37),
72 	GPIO_PINRANGE(87, 87, 48),
73 	GPIO_PINRANGE(88, 88, 47),
74 	GPIO_PINRANGE(89, 96, 49),
75 	GPIO_PINRANGE(97, 97, 34),
76 	GPIO_PINRANGE(102, 119, 83),
77 	GPIO_PINRANGE(120, 123, 79),
78 	GPIO_PINRANGE(124, 135, 115),
79 	GPIO_PINRANGE(137, 142, 158),
80 	GPIO_PINRANGE(154, 163, 24),
81 	GPIO_PINRANGE(164, 176, 215),
82 	GPIO_PINRANGE(177, 189, 127),
83 	GPIO_PINRANGE(190, 191, 178),
84 };
85 
86 static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned int offset,
87 			      unsigned int reg_type_offset)
88 {
89 	struct mrfld_gpio *priv = gpiochip_get_data(chip);
90 	u8 reg = offset / 32;
91 
92 	return priv->reg_base + reg_type_offset + reg * 4;
93 }
94 
95 static int mrfld_gpio_get(struct gpio_chip *chip, unsigned int offset)
96 {
97 	void __iomem *gplr = gpio_reg(chip, offset, GPLR);
98 
99 	return !!(readl(gplr) & BIT(offset % 32));
100 }
101 
102 static void mrfld_gpio_set(struct gpio_chip *chip, unsigned int offset,
103 			   int value)
104 {
105 	struct mrfld_gpio *priv = gpiochip_get_data(chip);
106 	void __iomem *gpsr, *gpcr;
107 	unsigned long flags;
108 
109 	raw_spin_lock_irqsave(&priv->lock, flags);
110 
111 	if (value) {
112 		gpsr = gpio_reg(chip, offset, GPSR);
113 		writel(BIT(offset % 32), gpsr);
114 	} else {
115 		gpcr = gpio_reg(chip, offset, GPCR);
116 		writel(BIT(offset % 32), gpcr);
117 	}
118 
119 	raw_spin_unlock_irqrestore(&priv->lock, flags);
120 }
121 
122 static int mrfld_gpio_direction_input(struct gpio_chip *chip,
123 				      unsigned int offset)
124 {
125 	struct mrfld_gpio *priv = gpiochip_get_data(chip);
126 	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
127 	unsigned long flags;
128 	u32 value;
129 
130 	raw_spin_lock_irqsave(&priv->lock, flags);
131 
132 	value = readl(gpdr);
133 	value &= ~BIT(offset % 32);
134 	writel(value, gpdr);
135 
136 	raw_spin_unlock_irqrestore(&priv->lock, flags);
137 
138 	return 0;
139 }
140 
141 static int mrfld_gpio_direction_output(struct gpio_chip *chip,
142 				       unsigned int offset, int value)
143 {
144 	struct mrfld_gpio *priv = gpiochip_get_data(chip);
145 	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
146 	unsigned long flags;
147 
148 	mrfld_gpio_set(chip, offset, value);
149 
150 	raw_spin_lock_irqsave(&priv->lock, flags);
151 
152 	value = readl(gpdr);
153 	value |= BIT(offset % 32);
154 	writel(value, gpdr);
155 
156 	raw_spin_unlock_irqrestore(&priv->lock, flags);
157 
158 	return 0;
159 }
160 
161 static int mrfld_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
162 {
163 	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
164 
165 	if (readl(gpdr) & BIT(offset % 32))
166 		return GPIO_LINE_DIRECTION_OUT;
167 
168 	return GPIO_LINE_DIRECTION_IN;
169 }
170 
171 static int mrfld_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
172 				   unsigned int debounce)
173 {
174 	struct mrfld_gpio *priv = gpiochip_get_data(chip);
175 	void __iomem *gfbr = gpio_reg(chip, offset, GFBR);
176 	unsigned long flags;
177 	u32 value;
178 
179 	raw_spin_lock_irqsave(&priv->lock, flags);
180 
181 	if (debounce)
182 		value = readl(gfbr) & ~BIT(offset % 32);
183 	else
184 		value = readl(gfbr) | BIT(offset % 32);
185 	writel(value, gfbr);
186 
187 	raw_spin_unlock_irqrestore(&priv->lock, flags);
188 
189 	return 0;
190 }
191 
192 static int mrfld_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
193 				 unsigned long config)
194 {
195 	u32 debounce;
196 
197 	if ((pinconf_to_config_param(config) == PIN_CONFIG_BIAS_DISABLE) ||
198 	    (pinconf_to_config_param(config) == PIN_CONFIG_BIAS_PULL_UP) ||
199 	    (pinconf_to_config_param(config) == PIN_CONFIG_BIAS_PULL_DOWN))
200 		return gpiochip_generic_config(chip, offset, config);
201 
202 	if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
203 		return -ENOTSUPP;
204 
205 	debounce = pinconf_to_config_argument(config);
206 	return mrfld_gpio_set_debounce(chip, offset, debounce);
207 }
208 
209 static void mrfld_irq_ack(struct irq_data *d)
210 {
211 	struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
212 	u32 gpio = irqd_to_hwirq(d);
213 	void __iomem *gisr = gpio_reg(&priv->chip, gpio, GISR);
214 	unsigned long flags;
215 
216 	raw_spin_lock_irqsave(&priv->lock, flags);
217 
218 	writel(BIT(gpio % 32), gisr);
219 
220 	raw_spin_unlock_irqrestore(&priv->lock, flags);
221 }
222 
223 static void mrfld_irq_unmask_mask(struct irq_data *d, bool unmask)
224 {
225 	struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
226 	u32 gpio = irqd_to_hwirq(d);
227 	void __iomem *gimr = gpio_reg(&priv->chip, gpio, GIMR);
228 	unsigned long flags;
229 	u32 value;
230 
231 	raw_spin_lock_irqsave(&priv->lock, flags);
232 
233 	if (unmask)
234 		value = readl(gimr) | BIT(gpio % 32);
235 	else
236 		value = readl(gimr) & ~BIT(gpio % 32);
237 	writel(value, gimr);
238 
239 	raw_spin_unlock_irqrestore(&priv->lock, flags);
240 }
241 
242 static void mrfld_irq_mask(struct irq_data *d)
243 {
244 	mrfld_irq_unmask_mask(d, false);
245 }
246 
247 static void mrfld_irq_unmask(struct irq_data *d)
248 {
249 	mrfld_irq_unmask_mask(d, true);
250 }
251 
252 static int mrfld_irq_set_type(struct irq_data *d, unsigned int type)
253 {
254 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
255 	struct mrfld_gpio *priv = gpiochip_get_data(gc);
256 	u32 gpio = irqd_to_hwirq(d);
257 	void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER);
258 	void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER);
259 	void __iomem *gitr = gpio_reg(&priv->chip, gpio, GITR);
260 	void __iomem *glpr = gpio_reg(&priv->chip, gpio, GLPR);
261 	unsigned long flags;
262 	u32 value;
263 
264 	raw_spin_lock_irqsave(&priv->lock, flags);
265 
266 	if (type & IRQ_TYPE_EDGE_RISING)
267 		value = readl(grer) | BIT(gpio % 32);
268 	else
269 		value = readl(grer) & ~BIT(gpio % 32);
270 	writel(value, grer);
271 
272 	if (type & IRQ_TYPE_EDGE_FALLING)
273 		value = readl(gfer) | BIT(gpio % 32);
274 	else
275 		value = readl(gfer) & ~BIT(gpio % 32);
276 	writel(value, gfer);
277 
278 	/*
279 	 * To prevent glitches from triggering an unintended level interrupt,
280 	 * configure GLPR register first and then configure GITR.
281 	 */
282 	if (type & IRQ_TYPE_LEVEL_LOW)
283 		value = readl(glpr) | BIT(gpio % 32);
284 	else
285 		value = readl(glpr) & ~BIT(gpio % 32);
286 	writel(value, glpr);
287 
288 	if (type & IRQ_TYPE_LEVEL_MASK) {
289 		value = readl(gitr) | BIT(gpio % 32);
290 		writel(value, gitr);
291 
292 		irq_set_handler_locked(d, handle_level_irq);
293 	} else if (type & IRQ_TYPE_EDGE_BOTH) {
294 		value = readl(gitr) & ~BIT(gpio % 32);
295 		writel(value, gitr);
296 
297 		irq_set_handler_locked(d, handle_edge_irq);
298 	}
299 
300 	raw_spin_unlock_irqrestore(&priv->lock, flags);
301 
302 	return 0;
303 }
304 
305 static int mrfld_irq_set_wake(struct irq_data *d, unsigned int on)
306 {
307 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
308 	struct mrfld_gpio *priv = gpiochip_get_data(gc);
309 	u32 gpio = irqd_to_hwirq(d);
310 	void __iomem *gwmr = gpio_reg(&priv->chip, gpio, GWMR);
311 	void __iomem *gwsr = gpio_reg(&priv->chip, gpio, GWSR);
312 	unsigned long flags;
313 	u32 value;
314 
315 	raw_spin_lock_irqsave(&priv->lock, flags);
316 
317 	/* Clear the existing wake status */
318 	writel(BIT(gpio % 32), gwsr);
319 
320 	if (on)
321 		value = readl(gwmr) | BIT(gpio % 32);
322 	else
323 		value = readl(gwmr) & ~BIT(gpio % 32);
324 	writel(value, gwmr);
325 
326 	raw_spin_unlock_irqrestore(&priv->lock, flags);
327 
328 	dev_dbg(priv->dev, "%sable wake for gpio %u\n", on ? "en" : "dis", gpio);
329 	return 0;
330 }
331 
332 static struct irq_chip mrfld_irqchip = {
333 	.name		= "gpio-merrifield",
334 	.irq_ack	= mrfld_irq_ack,
335 	.irq_mask	= mrfld_irq_mask,
336 	.irq_unmask	= mrfld_irq_unmask,
337 	.irq_set_type	= mrfld_irq_set_type,
338 	.irq_set_wake	= mrfld_irq_set_wake,
339 };
340 
341 static void mrfld_irq_handler(struct irq_desc *desc)
342 {
343 	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
344 	struct mrfld_gpio *priv = gpiochip_get_data(gc);
345 	struct irq_chip *irqchip = irq_desc_get_chip(desc);
346 	unsigned long base, gpio;
347 
348 	chained_irq_enter(irqchip, desc);
349 
350 	/* Check GPIO controller to check which pin triggered the interrupt */
351 	for (base = 0; base < priv->chip.ngpio; base += 32) {
352 		void __iomem *gisr = gpio_reg(&priv->chip, base, GISR);
353 		void __iomem *gimr = gpio_reg(&priv->chip, base, GIMR);
354 		unsigned long pending, enabled;
355 
356 		pending = readl(gisr);
357 		enabled = readl(gimr);
358 
359 		/* Only interrupts that are enabled */
360 		pending &= enabled;
361 
362 		for_each_set_bit(gpio, &pending, 32)
363 			generic_handle_domain_irq(gc->irq.domain, base + gpio);
364 	}
365 
366 	chained_irq_exit(irqchip, desc);
367 }
368 
369 static int mrfld_irq_init_hw(struct gpio_chip *chip)
370 {
371 	struct mrfld_gpio *priv = gpiochip_get_data(chip);
372 	void __iomem *reg;
373 	unsigned int base;
374 
375 	for (base = 0; base < priv->chip.ngpio; base += 32) {
376 		/* Clear the rising-edge detect register */
377 		reg = gpio_reg(&priv->chip, base, GRER);
378 		writel(0, reg);
379 		/* Clear the falling-edge detect register */
380 		reg = gpio_reg(&priv->chip, base, GFER);
381 		writel(0, reg);
382 	}
383 
384 	return 0;
385 }
386 
387 static const char *mrfld_gpio_get_pinctrl_dev_name(struct mrfld_gpio *priv)
388 {
389 	struct acpi_device *adev;
390 	const char *name;
391 
392 	adev = acpi_dev_get_first_match_dev("INTC1002", NULL, -1);
393 	if (adev) {
394 		name = devm_kstrdup(priv->dev, acpi_dev_name(adev), GFP_KERNEL);
395 		acpi_dev_put(adev);
396 	} else {
397 		name = "pinctrl-merrifield";
398 	}
399 
400 	return name;
401 }
402 
403 static int mrfld_gpio_add_pin_ranges(struct gpio_chip *chip)
404 {
405 	struct mrfld_gpio *priv = gpiochip_get_data(chip);
406 	const struct mrfld_gpio_pinrange *range;
407 	const char *pinctrl_dev_name;
408 	unsigned int i;
409 	int retval;
410 
411 	pinctrl_dev_name = mrfld_gpio_get_pinctrl_dev_name(priv);
412 	if (!pinctrl_dev_name)
413 		return -ENOMEM;
414 
415 	for (i = 0; i < ARRAY_SIZE(mrfld_gpio_ranges); i++) {
416 		range = &mrfld_gpio_ranges[i];
417 		retval = gpiochip_add_pin_range(&priv->chip, pinctrl_dev_name,
418 						range->gpio_base,
419 						range->pin_base,
420 						range->npins);
421 		if (retval) {
422 			dev_err(priv->dev, "failed to add GPIO pin range\n");
423 			return retval;
424 		}
425 	}
426 
427 	return 0;
428 }
429 
430 static int mrfld_gpio_probe(struct pci_dev *pdev, const struct pci_device_id *id)
431 {
432 	struct gpio_irq_chip *girq;
433 	struct mrfld_gpio *priv;
434 	u32 gpio_base, irq_base;
435 	void __iomem *base;
436 	int retval;
437 
438 	retval = pcim_enable_device(pdev);
439 	if (retval)
440 		return retval;
441 
442 	retval = pcim_iomap_regions(pdev, BIT(1) | BIT(0), pci_name(pdev));
443 	if (retval) {
444 		dev_err(&pdev->dev, "I/O memory mapping error\n");
445 		return retval;
446 	}
447 
448 	base = pcim_iomap_table(pdev)[1];
449 
450 	irq_base = readl(base + 0 * sizeof(u32));
451 	gpio_base = readl(base + 1 * sizeof(u32));
452 
453 	/* Release the IO mapping, since we already get the info from BAR1 */
454 	pcim_iounmap_regions(pdev, BIT(1));
455 
456 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
457 	if (!priv)
458 		return -ENOMEM;
459 
460 	priv->dev = &pdev->dev;
461 	priv->reg_base = pcim_iomap_table(pdev)[0];
462 
463 	priv->chip.label = dev_name(&pdev->dev);
464 	priv->chip.parent = &pdev->dev;
465 	priv->chip.request = gpiochip_generic_request;
466 	priv->chip.free = gpiochip_generic_free;
467 	priv->chip.direction_input = mrfld_gpio_direction_input;
468 	priv->chip.direction_output = mrfld_gpio_direction_output;
469 	priv->chip.get = mrfld_gpio_get;
470 	priv->chip.set = mrfld_gpio_set;
471 	priv->chip.get_direction = mrfld_gpio_get_direction;
472 	priv->chip.set_config = mrfld_gpio_set_config;
473 	priv->chip.base = gpio_base;
474 	priv->chip.ngpio = MRFLD_NGPIO;
475 	priv->chip.can_sleep = false;
476 	priv->chip.add_pin_ranges = mrfld_gpio_add_pin_ranges;
477 
478 	raw_spin_lock_init(&priv->lock);
479 
480 	retval = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
481 	if (retval < 0)
482 		return retval;
483 
484 	girq = &priv->chip.irq;
485 	girq->chip = &mrfld_irqchip;
486 	girq->init_hw = mrfld_irq_init_hw;
487 	girq->parent_handler = mrfld_irq_handler;
488 	girq->num_parents = 1;
489 	girq->parents = devm_kcalloc(&pdev->dev, girq->num_parents,
490 				     sizeof(*girq->parents), GFP_KERNEL);
491 	if (!girq->parents)
492 		return -ENOMEM;
493 	girq->parents[0] = pci_irq_vector(pdev, 0);
494 	girq->first = irq_base;
495 	girq->default_type = IRQ_TYPE_NONE;
496 	girq->handler = handle_bad_irq;
497 
498 	retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv);
499 	if (retval) {
500 		dev_err(&pdev->dev, "gpiochip_add error %d\n", retval);
501 		return retval;
502 	}
503 
504 	pci_set_drvdata(pdev, priv);
505 	return 0;
506 }
507 
508 static const struct pci_device_id mrfld_gpio_ids[] = {
509 	{ PCI_VDEVICE(INTEL, 0x1199) },
510 	{ }
511 };
512 MODULE_DEVICE_TABLE(pci, mrfld_gpio_ids);
513 
514 static struct pci_driver mrfld_gpio_driver = {
515 	.name		= "gpio-merrifield",
516 	.id_table	= mrfld_gpio_ids,
517 	.probe		= mrfld_gpio_probe,
518 };
519 
520 module_pci_driver(mrfld_gpio_driver);
521 
522 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
523 MODULE_DESCRIPTION("Intel Merrifield SoC GPIO driver");
524 MODULE_LICENSE("GPL v2");
525