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