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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/bitops.h>
13#include <linux/gpio/driver.h>
14#include <linux/gpio.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)) ? GPIOF_DIR_OUT : GPIOF_DIR_IN;
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 void mrfld_irq_ack(struct irq_data *d)
194{
195 struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
196 u32 gpio = irqd_to_hwirq(d);
197 void __iomem *gisr = gpio_reg(&priv->chip, gpio, GISR);
198 unsigned long flags;
199
200 raw_spin_lock_irqsave(&priv->lock, flags);
201
202 writel(BIT(gpio % 32), gisr);
203
204 raw_spin_unlock_irqrestore(&priv->lock, flags);
205}
206
207static void mrfld_irq_unmask_mask(struct irq_data *d, bool unmask)
208{
209 struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
210 u32 gpio = irqd_to_hwirq(d);
211 void __iomem *gimr = gpio_reg(&priv->chip, gpio, GIMR);
212 unsigned long flags;
213 u32 value;
214
215 raw_spin_lock_irqsave(&priv->lock, flags);
216
217 if (unmask)
218 value = readl(gimr) | BIT(gpio % 32);
219 else
220 value = readl(gimr) & ~BIT(gpio % 32);
221 writel(value, gimr);
222
223 raw_spin_unlock_irqrestore(&priv->lock, flags);
224}
225
226static void mrfld_irq_mask(struct irq_data *d)
227{
228 mrfld_irq_unmask_mask(d, false);
229}
230
231static void mrfld_irq_unmask(struct irq_data *d)
232{
233 mrfld_irq_unmask_mask(d, true);
234}
235
236static int mrfld_irq_set_type(struct irq_data *d, unsigned int type)
237{
238 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
239 struct mrfld_gpio *priv = gpiochip_get_data(gc);
240 u32 gpio = irqd_to_hwirq(d);
241 void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER);
242 void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER);
243 void __iomem *gitr = gpio_reg(&priv->chip, gpio, GITR);
244 void __iomem *glpr = gpio_reg(&priv->chip, gpio, GLPR);
245 unsigned long flags;
246 u32 value;
247
248 raw_spin_lock_irqsave(&priv->lock, flags);
249
250 if (type & IRQ_TYPE_EDGE_RISING)
251 value = readl(grer) | BIT(gpio % 32);
252 else
253 value = readl(grer) & ~BIT(gpio % 32);
254 writel(value, grer);
255
256 if (type & IRQ_TYPE_EDGE_FALLING)
257 value = readl(gfer) | BIT(gpio % 32);
258 else
259 value = readl(gfer) & ~BIT(gpio % 32);
260 writel(value, gfer);
261
262 /*
263 * To prevent glitches from triggering an unintended level interrupt,
264 * configure GLPR register first and then configure GITR.
265 */
266 if (type & IRQ_TYPE_LEVEL_LOW)
267 value = readl(glpr) | BIT(gpio % 32);
268 else
269 value = readl(glpr) & ~BIT(gpio % 32);
270 writel(value, glpr);
271
272 if (type & IRQ_TYPE_LEVEL_MASK) {
273 value = readl(gitr) | BIT(gpio % 32);
274 writel(value, gitr);
275
276 irq_set_handler_locked(d, handle_level_irq);
277 } else if (type & IRQ_TYPE_EDGE_BOTH) {
278 value = readl(gitr) & ~BIT(gpio % 32);
279 writel(value, gitr);
280
281 irq_set_handler_locked(d, handle_edge_irq);
282 }
283
284 raw_spin_unlock_irqrestore(&priv->lock, flags);
285
286 return 0;
287}
288
289static int mrfld_irq_set_wake(struct irq_data *d, unsigned int on)
290{
291 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
292 struct mrfld_gpio *priv = gpiochip_get_data(gc);
293 u32 gpio = irqd_to_hwirq(d);
294 void __iomem *gwmr = gpio_reg(&priv->chip, gpio, GWMR);
295 void __iomem *gwsr = gpio_reg(&priv->chip, gpio, GWSR);
296 unsigned long flags;
297 u32 value;
298
299 raw_spin_lock_irqsave(&priv->lock, flags);
300
301 /* Clear the existing wake status */
302 writel(BIT(gpio % 32), gwsr);
303
304 if (on)
305 value = readl(gwmr) | BIT(gpio % 32);
306 else
307 value = readl(gwmr) & ~BIT(gpio % 32);
308 writel(value, gwmr);
309
310 raw_spin_unlock_irqrestore(&priv->lock, flags);
311
312 dev_dbg(priv->dev, "%sable wake for gpio %u\n", on ? "en" : "dis", gpio);
313 return 0;
314}
315
316static struct irq_chip mrfld_irqchip = {
317 .name = "gpio-merrifield",
318 .irq_ack = mrfld_irq_ack,
319 .irq_mask = mrfld_irq_mask,
320 .irq_unmask = mrfld_irq_unmask,
321 .irq_set_type = mrfld_irq_set_type,
322 .irq_set_wake = mrfld_irq_set_wake,
323};
324
325static void mrfld_irq_handler(struct irq_desc *desc)
326{
327 struct gpio_chip *gc = irq_desc_get_handler_data(desc);
328 struct mrfld_gpio *priv = gpiochip_get_data(gc);
329 struct irq_chip *irqchip = irq_desc_get_chip(desc);
330 unsigned long base, gpio;
331
332 chained_irq_enter(irqchip, desc);
333
334 /* Check GPIO controller to check which pin triggered the interrupt */
335 for (base = 0; base < priv->chip.ngpio; base += 32) {
336 void __iomem *gisr = gpio_reg(&priv->chip, base, GISR);
337 void __iomem *gimr = gpio_reg(&priv->chip, base, GIMR);
338 unsigned long pending, enabled;
339
340 pending = readl(gisr);
341 enabled = readl(gimr);
342
343 /* Only interrupts that are enabled */
344 pending &= enabled;
345
346 for_each_set_bit(gpio, &pending, 32) {
347 unsigned int irq;
348
349 irq = irq_find_mapping(gc->irqdomain, base + gpio);
350 generic_handle_irq(irq);
351 }
352 }
353
354 chained_irq_exit(irqchip, desc);
355}
356
357static void mrfld_irq_init_hw(struct mrfld_gpio *priv)
358{
359 void __iomem *reg;
360 unsigned int base;
361
362 for (base = 0; base < priv->chip.ngpio; base += 32) {
363 /* Clear the rising-edge detect register */
364 reg = gpio_reg(&priv->chip, base, GRER);
365 writel(0, reg);
366 /* Clear the falling-edge detect register */
367 reg = gpio_reg(&priv->chip, base, GFER);
368 writel(0, reg);
369 }
370}
371
372static int mrfld_gpio_probe(struct pci_dev *pdev, const struct pci_device_id *id)
373{
374 const struct mrfld_gpio_pinrange *range;
375 struct mrfld_gpio *priv;
376 u32 gpio_base, irq_base;
377 void __iomem *base;
378 unsigned int i;
379 int retval;
380
381 retval = pcim_enable_device(pdev);
382 if (retval)
383 return retval;
384
385 retval = pcim_iomap_regions(pdev, BIT(1) | BIT(0), pci_name(pdev));
386 if (retval) {
387 dev_err(&pdev->dev, "I/O memory mapping error\n");
388 return retval;
389 }
390
391 base = pcim_iomap_table(pdev)[1];
392
393 irq_base = readl(base);
394 gpio_base = readl(sizeof(u32) + base);
395
396 /* Release the IO mapping, since we already get the info from BAR1 */
397 pcim_iounmap_regions(pdev, BIT(1));
398
399 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
400 if (!priv) {
401 dev_err(&pdev->dev, "can't allocate chip data\n");
402 return -ENOMEM;
403 }
404
405 priv->dev = &pdev->dev;
406 priv->reg_base = pcim_iomap_table(pdev)[0];
407
408 priv->chip.label = dev_name(&pdev->dev);
409 priv->chip.parent = &pdev->dev;
410 priv->chip.request = gpiochip_generic_request;
411 priv->chip.free = gpiochip_generic_free;
412 priv->chip.direction_input = mrfld_gpio_direction_input;
413 priv->chip.direction_output = mrfld_gpio_direction_output;
414 priv->chip.get = mrfld_gpio_get;
415 priv->chip.set = mrfld_gpio_set;
416 priv->chip.get_direction = mrfld_gpio_get_direction;
417 priv->chip.set_debounce = mrfld_gpio_set_debounce;
418 priv->chip.base = gpio_base;
419 priv->chip.ngpio = MRFLD_NGPIO;
420 priv->chip.can_sleep = false;
421
422 raw_spin_lock_init(&priv->lock);
423
424 pci_set_drvdata(pdev, priv);
425 retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv);
426 if (retval) {
427 dev_err(&pdev->dev, "gpiochip_add error %d\n", retval);
428 return retval;
429 }
430
431 for (i = 0; i < ARRAY_SIZE(mrfld_gpio_ranges); i++) {
432 range = &mrfld_gpio_ranges[i];
433 retval = gpiochip_add_pin_range(&priv->chip,
434 "pinctrl-merrifield",
435 range->gpio_base,
436 range->pin_base,
437 range->npins);
438 if (retval) {
439 dev_err(&pdev->dev, "failed to add GPIO pin range\n");
440 return retval;
441 }
442 }
443
444 retval = gpiochip_irqchip_add(&priv->chip, &mrfld_irqchip, irq_base,
445 handle_bad_irq, IRQ_TYPE_NONE);
446 if (retval) {
447 dev_err(&pdev->dev, "could not connect irqchip to gpiochip\n");
448 return retval;
449 }
450
451 mrfld_irq_init_hw(priv);
452
453 gpiochip_set_chained_irqchip(&priv->chip, &mrfld_irqchip, pdev->irq,
454 mrfld_irq_handler);
455
456 return 0;
457}
458
459static const struct pci_device_id mrfld_gpio_ids[] = {
460 { PCI_VDEVICE(INTEL, 0x1199) },
461 { }
462};
463MODULE_DEVICE_TABLE(pci, mrfld_gpio_ids);
464
465static struct pci_driver mrfld_gpio_driver = {
466 .name = "gpio-merrifield",
467 .id_table = mrfld_gpio_ids,
468 .probe = mrfld_gpio_probe,
469};
470
471module_pci_driver(mrfld_gpio_driver);
472
473MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
474MODULE_DESCRIPTION("Intel Merrifield SoC GPIO driver");
475MODULE_LICENSE("GPL v2");