1 // SPDX-License-Identifier: GPL-2.0
3 * Intel Merrifield SoC GPIO driver
5 * Copyright (c) 2016 Intel Corporation.
6 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
9 #include <linux/acpi.h>
10 #include <linux/bitops.h>
11 #include <linux/gpio/driver.h>
12 #include <linux/interrupt.h>
14 #include <linux/module.h>
15 #include <linux/pci.h>
16 #include <linux/pinctrl/consumer.h>
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 */
34 /* Intel Merrifield has 192 GPIO pins */
35 #define MRFLD_NGPIO 192
37 struct mrfld_gpio_pinrange {
38 unsigned int gpio_base;
39 unsigned int pin_base;
43 #define GPIO_PINRANGE(gstart, gend, pstart) \
45 .gpio_base = (gstart), \
46 .pin_base = (pstart), \
47 .npins = (gend) - (gstart) + 1, \
51 struct gpio_chip chip;
52 void __iomem *reg_base;
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),
86 static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned int offset,
87 unsigned int reg_type_offset)
89 struct mrfld_gpio *priv = gpiochip_get_data(chip);
92 return priv->reg_base + reg_type_offset + reg * 4;
95 static int mrfld_gpio_get(struct gpio_chip *chip, unsigned int offset)
97 void __iomem *gplr = gpio_reg(chip, offset, GPLR);
99 return !!(readl(gplr) & BIT(offset % 32));
102 static void mrfld_gpio_set(struct gpio_chip *chip, unsigned int offset,
105 struct mrfld_gpio *priv = gpiochip_get_data(chip);
106 void __iomem *gpsr, *gpcr;
109 raw_spin_lock_irqsave(&priv->lock, flags);
112 gpsr = gpio_reg(chip, offset, GPSR);
113 writel(BIT(offset % 32), gpsr);
115 gpcr = gpio_reg(chip, offset, GPCR);
116 writel(BIT(offset % 32), gpcr);
119 raw_spin_unlock_irqrestore(&priv->lock, flags);
122 static int mrfld_gpio_direction_input(struct gpio_chip *chip,
125 struct mrfld_gpio *priv = gpiochip_get_data(chip);
126 void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
130 raw_spin_lock_irqsave(&priv->lock, flags);
133 value &= ~BIT(offset % 32);
136 raw_spin_unlock_irqrestore(&priv->lock, flags);
141 static int mrfld_gpio_direction_output(struct gpio_chip *chip,
142 unsigned int offset, int value)
144 struct mrfld_gpio *priv = gpiochip_get_data(chip);
145 void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
148 mrfld_gpio_set(chip, offset, value);
150 raw_spin_lock_irqsave(&priv->lock, flags);
153 value |= BIT(offset % 32);
156 raw_spin_unlock_irqrestore(&priv->lock, flags);
161 static int mrfld_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
163 void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
165 if (readl(gpdr) & BIT(offset % 32))
166 return GPIO_LINE_DIRECTION_OUT;
168 return GPIO_LINE_DIRECTION_IN;
171 static int mrfld_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
172 unsigned int debounce)
174 struct mrfld_gpio *priv = gpiochip_get_data(chip);
175 void __iomem *gfbr = gpio_reg(chip, offset, GFBR);
179 raw_spin_lock_irqsave(&priv->lock, flags);
182 value = readl(gfbr) & ~BIT(offset % 32);
184 value = readl(gfbr) | BIT(offset % 32);
187 raw_spin_unlock_irqrestore(&priv->lock, flags);
192 static int mrfld_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
193 unsigned long config)
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);
202 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
205 debounce = pinconf_to_config_argument(config);
206 return mrfld_gpio_set_debounce(chip, offset, debounce);
209 static void mrfld_irq_ack(struct irq_data *d)
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);
216 raw_spin_lock_irqsave(&priv->lock, flags);
218 writel(BIT(gpio % 32), gisr);
220 raw_spin_unlock_irqrestore(&priv->lock, flags);
223 static void mrfld_irq_unmask_mask(struct irq_data *d, bool unmask)
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);
231 raw_spin_lock_irqsave(&priv->lock, flags);
234 value = readl(gimr) | BIT(gpio % 32);
236 value = readl(gimr) & ~BIT(gpio % 32);
239 raw_spin_unlock_irqrestore(&priv->lock, flags);
242 static void mrfld_irq_mask(struct irq_data *d)
244 mrfld_irq_unmask_mask(d, false);
247 static void mrfld_irq_unmask(struct irq_data *d)
249 mrfld_irq_unmask_mask(d, true);
252 static int mrfld_irq_set_type(struct irq_data *d, unsigned int type)
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);
264 raw_spin_lock_irqsave(&priv->lock, flags);
266 if (type & IRQ_TYPE_EDGE_RISING)
267 value = readl(grer) | BIT(gpio % 32);
269 value = readl(grer) & ~BIT(gpio % 32);
272 if (type & IRQ_TYPE_EDGE_FALLING)
273 value = readl(gfer) | BIT(gpio % 32);
275 value = readl(gfer) & ~BIT(gpio % 32);
279 * To prevent glitches from triggering an unintended level interrupt,
280 * configure GLPR register first and then configure GITR.
282 if (type & IRQ_TYPE_LEVEL_LOW)
283 value = readl(glpr) | BIT(gpio % 32);
285 value = readl(glpr) & ~BIT(gpio % 32);
288 if (type & IRQ_TYPE_LEVEL_MASK) {
289 value = readl(gitr) | BIT(gpio % 32);
292 irq_set_handler_locked(d, handle_level_irq);
293 } else if (type & IRQ_TYPE_EDGE_BOTH) {
294 value = readl(gitr) & ~BIT(gpio % 32);
297 irq_set_handler_locked(d, handle_edge_irq);
300 raw_spin_unlock_irqrestore(&priv->lock, flags);
305 static int mrfld_irq_set_wake(struct irq_data *d, unsigned int on)
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);
315 raw_spin_lock_irqsave(&priv->lock, flags);
317 /* Clear the existing wake status */
318 writel(BIT(gpio % 32), gwsr);
321 value = readl(gwmr) | BIT(gpio % 32);
323 value = readl(gwmr) & ~BIT(gpio % 32);
326 raw_spin_unlock_irqrestore(&priv->lock, flags);
328 dev_dbg(priv->dev, "%sable wake for gpio %u\n", on ? "en" : "dis", gpio);
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,
341 static void mrfld_irq_handler(struct irq_desc *desc)
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;
348 chained_irq_enter(irqchip, desc);
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;
356 pending = readl(gisr);
357 enabled = readl(gimr);
359 /* Only interrupts that are enabled */
362 for_each_set_bit(gpio, &pending, 32)
363 generic_handle_domain_irq(gc->irq.domain, base + gpio);
366 chained_irq_exit(irqchip, desc);
369 static int mrfld_irq_init_hw(struct gpio_chip *chip)
371 struct mrfld_gpio *priv = gpiochip_get_data(chip);
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);
379 /* Clear the falling-edge detect register */
380 reg = gpio_reg(&priv->chip, base, GFER);
387 static const char *mrfld_gpio_get_pinctrl_dev_name(struct mrfld_gpio *priv)
389 struct acpi_device *adev;
392 adev = acpi_dev_get_first_match_dev("INTC1002", NULL, -1);
394 name = devm_kstrdup(priv->dev, acpi_dev_name(adev), GFP_KERNEL);
397 name = "pinctrl-merrifield";
403 static int mrfld_gpio_add_pin_ranges(struct gpio_chip *chip)
405 struct mrfld_gpio *priv = gpiochip_get_data(chip);
406 const struct mrfld_gpio_pinrange *range;
407 const char *pinctrl_dev_name;
411 pinctrl_dev_name = mrfld_gpio_get_pinctrl_dev_name(priv);
412 for (i = 0; i < ARRAY_SIZE(mrfld_gpio_ranges); i++) {
413 range = &mrfld_gpio_ranges[i];
414 retval = gpiochip_add_pin_range(&priv->chip, pinctrl_dev_name,
419 dev_err(priv->dev, "failed to add GPIO pin range\n");
427 static int mrfld_gpio_probe(struct pci_dev *pdev, const struct pci_device_id *id)
429 struct gpio_irq_chip *girq;
430 struct mrfld_gpio *priv;
431 u32 gpio_base, irq_base;
435 retval = pcim_enable_device(pdev);
439 retval = pcim_iomap_regions(pdev, BIT(1) | BIT(0), pci_name(pdev));
441 dev_err(&pdev->dev, "I/O memory mapping error\n");
445 base = pcim_iomap_table(pdev)[1];
447 irq_base = readl(base + 0 * sizeof(u32));
448 gpio_base = readl(base + 1 * sizeof(u32));
450 /* Release the IO mapping, since we already get the info from BAR1 */
451 pcim_iounmap_regions(pdev, BIT(1));
453 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
457 priv->dev = &pdev->dev;
458 priv->reg_base = pcim_iomap_table(pdev)[0];
460 priv->chip.label = dev_name(&pdev->dev);
461 priv->chip.parent = &pdev->dev;
462 priv->chip.request = gpiochip_generic_request;
463 priv->chip.free = gpiochip_generic_free;
464 priv->chip.direction_input = mrfld_gpio_direction_input;
465 priv->chip.direction_output = mrfld_gpio_direction_output;
466 priv->chip.get = mrfld_gpio_get;
467 priv->chip.set = mrfld_gpio_set;
468 priv->chip.get_direction = mrfld_gpio_get_direction;
469 priv->chip.set_config = mrfld_gpio_set_config;
470 priv->chip.base = gpio_base;
471 priv->chip.ngpio = MRFLD_NGPIO;
472 priv->chip.can_sleep = false;
473 priv->chip.add_pin_ranges = mrfld_gpio_add_pin_ranges;
475 raw_spin_lock_init(&priv->lock);
477 retval = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
481 girq = &priv->chip.irq;
482 girq->chip = &mrfld_irqchip;
483 girq->init_hw = mrfld_irq_init_hw;
484 girq->parent_handler = mrfld_irq_handler;
485 girq->num_parents = 1;
486 girq->parents = devm_kcalloc(&pdev->dev, girq->num_parents,
487 sizeof(*girq->parents), GFP_KERNEL);
490 girq->parents[0] = pci_irq_vector(pdev, 0);
491 girq->first = irq_base;
492 girq->default_type = IRQ_TYPE_NONE;
493 girq->handler = handle_bad_irq;
495 retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv);
497 dev_err(&pdev->dev, "gpiochip_add error %d\n", retval);
501 pci_set_drvdata(pdev, priv);
505 static const struct pci_device_id mrfld_gpio_ids[] = {
506 { PCI_VDEVICE(INTEL, 0x1199) },
509 MODULE_DEVICE_TABLE(pci, mrfld_gpio_ids);
511 static struct pci_driver mrfld_gpio_driver = {
512 .name = "gpio-merrifield",
513 .id_table = mrfld_gpio_ids,
514 .probe = mrfld_gpio_probe,
517 module_pci_driver(mrfld_gpio_driver);
519 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
520 MODULE_DESCRIPTION("Intel Merrifield SoC GPIO driver");
521 MODULE_LICENSE("GPL v2");