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Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-kernel.git] / drivers / gpio / gpio-dwapb.c
1 /*
2 * Copyright (c) 2011 Jamie Iles
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * All enquiries to support@picochip.com
9 */
10 #include <linux/acpi.h>
11 #include <linux/gpio/driver.h>
12 /* FIXME: for gpio_get_value(), replace this with direct register read */
13 #include <linux/gpio.h>
14 #include <linux/err.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/io.h>
18 #include <linux/ioport.h>
19 #include <linux/irq.h>
20 #include <linux/irqdomain.h>
21 #include <linux/module.h>
22 #include <linux/of.h>
23 #include <linux/of_address.h>
24 #include <linux/of_device.h>
25 #include <linux/of_irq.h>
26 #include <linux/platform_device.h>
27 #include <linux/property.h>
28 #include <linux/reset.h>
29 #include <linux/spinlock.h>
30 #include <linux/platform_data/gpio-dwapb.h>
31 #include <linux/slab.h>
32
33 #include "gpiolib.h"
34
35 #define GPIO_SWPORTA_DR 0x00
36 #define GPIO_SWPORTA_DDR 0x04
37 #define GPIO_SWPORTB_DR 0x0c
38 #define GPIO_SWPORTB_DDR 0x10
39 #define GPIO_SWPORTC_DR 0x18
40 #define GPIO_SWPORTC_DDR 0x1c
41 #define GPIO_SWPORTD_DR 0x24
42 #define GPIO_SWPORTD_DDR 0x28
43 #define GPIO_INTEN 0x30
44 #define GPIO_INTMASK 0x34
45 #define GPIO_INTTYPE_LEVEL 0x38
46 #define GPIO_INT_POLARITY 0x3c
47 #define GPIO_INTSTATUS 0x40
48 #define GPIO_PORTA_DEBOUNCE 0x48
49 #define GPIO_PORTA_EOI 0x4c
50 #define GPIO_EXT_PORTA 0x50
51 #define GPIO_EXT_PORTB 0x54
52 #define GPIO_EXT_PORTC 0x58
53 #define GPIO_EXT_PORTD 0x5c
54
55 #define DWAPB_MAX_PORTS 4
56 #define GPIO_EXT_PORT_SIZE (GPIO_EXT_PORTB - GPIO_EXT_PORTA)
57 #define GPIO_SWPORT_DR_SIZE (GPIO_SWPORTB_DR - GPIO_SWPORTA_DR)
58 #define GPIO_SWPORT_DDR_SIZE (GPIO_SWPORTB_DDR - GPIO_SWPORTA_DDR)
59
60 #define GPIO_REG_OFFSET_V2 1
61
62 #define GPIO_INTMASK_V2 0x44
63 #define GPIO_INTTYPE_LEVEL_V2 0x34
64 #define GPIO_INT_POLARITY_V2 0x38
65 #define GPIO_INTSTATUS_V2 0x3c
66 #define GPIO_PORTA_EOI_V2 0x40
67
68 struct dwapb_gpio;
69
70 #ifdef CONFIG_PM_SLEEP
71 /* Store GPIO context across system-wide suspend/resume transitions */
72 struct dwapb_context {
73 u32 data;
74 u32 dir;
75 u32 ext;
76 u32 int_en;
77 u32 int_mask;
78 u32 int_type;
79 u32 int_pol;
80 u32 int_deb;
81 u32 wake_en;
82 };
83 #endif
84
85 struct dwapb_gpio_port {
86 struct gpio_chip gc;
87 bool is_registered;
88 struct dwapb_gpio *gpio;
89 #ifdef CONFIG_PM_SLEEP
90 struct dwapb_context *ctx;
91 #endif
92 unsigned int idx;
93 };
94
95 struct dwapb_gpio {
96 struct device *dev;
97 void __iomem *regs;
98 struct dwapb_gpio_port *ports;
99 unsigned int nr_ports;
100 struct irq_domain *domain;
101 unsigned int flags;
102 struct reset_control *rst;
103 };
104
105 static inline u32 gpio_reg_v2_convert(unsigned int offset)
106 {
107 switch (offset) {
108 case GPIO_INTMASK:
109 return GPIO_INTMASK_V2;
110 case GPIO_INTTYPE_LEVEL:
111 return GPIO_INTTYPE_LEVEL_V2;
112 case GPIO_INT_POLARITY:
113 return GPIO_INT_POLARITY_V2;
114 case GPIO_INTSTATUS:
115 return GPIO_INTSTATUS_V2;
116 case GPIO_PORTA_EOI:
117 return GPIO_PORTA_EOI_V2;
118 }
119
120 return offset;
121 }
122
123 static inline u32 gpio_reg_convert(struct dwapb_gpio *gpio, unsigned int offset)
124 {
125 if (gpio->flags & GPIO_REG_OFFSET_V2)
126 return gpio_reg_v2_convert(offset);
127
128 return offset;
129 }
130
131 static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset)
132 {
133 struct gpio_chip *gc = &gpio->ports[0].gc;
134 void __iomem *reg_base = gpio->regs;
135
136 return gc->read_reg(reg_base + gpio_reg_convert(gpio, offset));
137 }
138
139 static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset,
140 u32 val)
141 {
142 struct gpio_chip *gc = &gpio->ports[0].gc;
143 void __iomem *reg_base = gpio->regs;
144
145 gc->write_reg(reg_base + gpio_reg_convert(gpio, offset), val);
146 }
147
148 static int dwapb_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
149 {
150 struct dwapb_gpio_port *port = gpiochip_get_data(gc);
151 struct dwapb_gpio *gpio = port->gpio;
152
153 return irq_find_mapping(gpio->domain, offset);
154 }
155
156 static void dwapb_toggle_trigger(struct dwapb_gpio *gpio, unsigned int offs)
157 {
158 u32 v = dwapb_read(gpio, GPIO_INT_POLARITY);
159
160 if (gpio_get_value(gpio->ports[0].gc.base + offs))
161 v &= ~BIT(offs);
162 else
163 v |= BIT(offs);
164
165 dwapb_write(gpio, GPIO_INT_POLARITY, v);
166 }
167
168 static u32 dwapb_do_irq(struct dwapb_gpio *gpio)
169 {
170 u32 irq_status = dwapb_read(gpio, GPIO_INTSTATUS);
171 u32 ret = irq_status;
172
173 while (irq_status) {
174 int hwirq = fls(irq_status) - 1;
175 int gpio_irq = irq_find_mapping(gpio->domain, hwirq);
176
177 generic_handle_irq(gpio_irq);
178 irq_status &= ~BIT(hwirq);
179
180 if ((irq_get_trigger_type(gpio_irq) & IRQ_TYPE_SENSE_MASK)
181 == IRQ_TYPE_EDGE_BOTH)
182 dwapb_toggle_trigger(gpio, hwirq);
183 }
184
185 return ret;
186 }
187
188 static void dwapb_irq_handler(struct irq_desc *desc)
189 {
190 struct dwapb_gpio *gpio = irq_desc_get_handler_data(desc);
191 struct irq_chip *chip = irq_desc_get_chip(desc);
192
193 dwapb_do_irq(gpio);
194
195 if (chip->irq_eoi)
196 chip->irq_eoi(irq_desc_get_irq_data(desc));
197 }
198
199 static void dwapb_irq_enable(struct irq_data *d)
200 {
201 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
202 struct dwapb_gpio *gpio = igc->private;
203 struct gpio_chip *gc = &gpio->ports[0].gc;
204 unsigned long flags;
205 u32 val;
206
207 spin_lock_irqsave(&gc->bgpio_lock, flags);
208 val = dwapb_read(gpio, GPIO_INTEN);
209 val |= BIT(d->hwirq);
210 dwapb_write(gpio, GPIO_INTEN, val);
211 spin_unlock_irqrestore(&gc->bgpio_lock, flags);
212 }
213
214 static void dwapb_irq_disable(struct irq_data *d)
215 {
216 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
217 struct dwapb_gpio *gpio = igc->private;
218 struct gpio_chip *gc = &gpio->ports[0].gc;
219 unsigned long flags;
220 u32 val;
221
222 spin_lock_irqsave(&gc->bgpio_lock, flags);
223 val = dwapb_read(gpio, GPIO_INTEN);
224 val &= ~BIT(d->hwirq);
225 dwapb_write(gpio, GPIO_INTEN, val);
226 spin_unlock_irqrestore(&gc->bgpio_lock, flags);
227 }
228
229 static int dwapb_irq_reqres(struct irq_data *d)
230 {
231 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
232 struct dwapb_gpio *gpio = igc->private;
233 struct gpio_chip *gc = &gpio->ports[0].gc;
234
235 if (gpiochip_lock_as_irq(gc, irqd_to_hwirq(d))) {
236 dev_err(gpio->dev, "unable to lock HW IRQ %lu for IRQ\n",
237 irqd_to_hwirq(d));
238 return -EINVAL;
239 }
240 return 0;
241 }
242
243 static void dwapb_irq_relres(struct irq_data *d)
244 {
245 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
246 struct dwapb_gpio *gpio = igc->private;
247 struct gpio_chip *gc = &gpio->ports[0].gc;
248
249 gpiochip_unlock_as_irq(gc, irqd_to_hwirq(d));
250 }
251
252 static int dwapb_irq_set_type(struct irq_data *d, u32 type)
253 {
254 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
255 struct dwapb_gpio *gpio = igc->private;
256 struct gpio_chip *gc = &gpio->ports[0].gc;
257 int bit = d->hwirq;
258 unsigned long level, polarity, flags;
259
260 if (type & ~(IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
261 IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
262 return -EINVAL;
263
264 spin_lock_irqsave(&gc->bgpio_lock, flags);
265 level = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
266 polarity = dwapb_read(gpio, GPIO_INT_POLARITY);
267
268 switch (type) {
269 case IRQ_TYPE_EDGE_BOTH:
270 level |= BIT(bit);
271 dwapb_toggle_trigger(gpio, bit);
272 break;
273 case IRQ_TYPE_EDGE_RISING:
274 level |= BIT(bit);
275 polarity |= BIT(bit);
276 break;
277 case IRQ_TYPE_EDGE_FALLING:
278 level |= BIT(bit);
279 polarity &= ~BIT(bit);
280 break;
281 case IRQ_TYPE_LEVEL_HIGH:
282 level &= ~BIT(bit);
283 polarity |= BIT(bit);
284 break;
285 case IRQ_TYPE_LEVEL_LOW:
286 level &= ~BIT(bit);
287 polarity &= ~BIT(bit);
288 break;
289 }
290
291 irq_setup_alt_chip(d, type);
292
293 dwapb_write(gpio, GPIO_INTTYPE_LEVEL, level);
294 if (type != IRQ_TYPE_EDGE_BOTH)
295 dwapb_write(gpio, GPIO_INT_POLARITY, polarity);
296 spin_unlock_irqrestore(&gc->bgpio_lock, flags);
297
298 return 0;
299 }
300
301 #ifdef CONFIG_PM_SLEEP
302 static int dwapb_irq_set_wake(struct irq_data *d, unsigned int enable)
303 {
304 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
305 struct dwapb_gpio *gpio = igc->private;
306 struct dwapb_context *ctx = gpio->ports[0].ctx;
307
308 if (enable)
309 ctx->wake_en |= BIT(d->hwirq);
310 else
311 ctx->wake_en &= ~BIT(d->hwirq);
312
313 return 0;
314 }
315 #endif
316
317 static int dwapb_gpio_set_debounce(struct gpio_chip *gc,
318 unsigned offset, unsigned debounce)
319 {
320 struct dwapb_gpio_port *port = gpiochip_get_data(gc);
321 struct dwapb_gpio *gpio = port->gpio;
322 unsigned long flags, val_deb;
323 unsigned long mask = BIT(offset);
324
325 spin_lock_irqsave(&gc->bgpio_lock, flags);
326
327 val_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
328 if (debounce)
329 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb | mask);
330 else
331 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb & ~mask);
332
333 spin_unlock_irqrestore(&gc->bgpio_lock, flags);
334
335 return 0;
336 }
337
338 static int dwapb_gpio_set_config(struct gpio_chip *gc, unsigned offset,
339 unsigned long config)
340 {
341 u32 debounce;
342
343 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
344 return -ENOTSUPP;
345
346 debounce = pinconf_to_config_argument(config);
347 return dwapb_gpio_set_debounce(gc, offset, debounce);
348 }
349
350 static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id)
351 {
352 u32 worked;
353 struct dwapb_gpio *gpio = dev_id;
354
355 worked = dwapb_do_irq(gpio);
356
357 return worked ? IRQ_HANDLED : IRQ_NONE;
358 }
359
360 static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
361 struct dwapb_gpio_port *port,
362 struct dwapb_port_property *pp)
363 {
364 struct gpio_chip *gc = &port->gc;
365 struct fwnode_handle *fwnode = pp->fwnode;
366 struct irq_chip_generic *irq_gc = NULL;
367 unsigned int hwirq, ngpio = gc->ngpio;
368 struct irq_chip_type *ct;
369 int err, i;
370
371 gpio->domain = irq_domain_create_linear(fwnode, ngpio,
372 &irq_generic_chip_ops, gpio);
373 if (!gpio->domain)
374 return;
375
376 err = irq_alloc_domain_generic_chips(gpio->domain, ngpio, 2,
377 "gpio-dwapb", handle_level_irq,
378 IRQ_NOREQUEST, 0,
379 IRQ_GC_INIT_NESTED_LOCK);
380 if (err) {
381 dev_info(gpio->dev, "irq_alloc_domain_generic_chips failed\n");
382 irq_domain_remove(gpio->domain);
383 gpio->domain = NULL;
384 return;
385 }
386
387 irq_gc = irq_get_domain_generic_chip(gpio->domain, 0);
388 if (!irq_gc) {
389 irq_domain_remove(gpio->domain);
390 gpio->domain = NULL;
391 return;
392 }
393
394 irq_gc->reg_base = gpio->regs;
395 irq_gc->private = gpio;
396
397 for (i = 0; i < 2; i++) {
398 ct = &irq_gc->chip_types[i];
399 ct->chip.irq_ack = irq_gc_ack_set_bit;
400 ct->chip.irq_mask = irq_gc_mask_set_bit;
401 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
402 ct->chip.irq_set_type = dwapb_irq_set_type;
403 ct->chip.irq_enable = dwapb_irq_enable;
404 ct->chip.irq_disable = dwapb_irq_disable;
405 ct->chip.irq_request_resources = dwapb_irq_reqres;
406 ct->chip.irq_release_resources = dwapb_irq_relres;
407 #ifdef CONFIG_PM_SLEEP
408 ct->chip.irq_set_wake = dwapb_irq_set_wake;
409 #endif
410 ct->regs.ack = gpio_reg_convert(gpio, GPIO_PORTA_EOI);
411 ct->regs.mask = gpio_reg_convert(gpio, GPIO_INTMASK);
412 ct->type = IRQ_TYPE_LEVEL_MASK;
413 }
414
415 irq_gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK;
416 irq_gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH;
417 irq_gc->chip_types[1].handler = handle_edge_irq;
418
419 if (!pp->irq_shared) {
420 irq_set_chained_handler_and_data(pp->irq, dwapb_irq_handler,
421 gpio);
422 } else {
423 /*
424 * Request a shared IRQ since where MFD would have devices
425 * using the same irq pin
426 */
427 err = devm_request_irq(gpio->dev, pp->irq,
428 dwapb_irq_handler_mfd,
429 IRQF_SHARED, "gpio-dwapb-mfd", gpio);
430 if (err) {
431 dev_err(gpio->dev, "error requesting IRQ\n");
432 irq_domain_remove(gpio->domain);
433 gpio->domain = NULL;
434 return;
435 }
436 }
437
438 for (hwirq = 0 ; hwirq < ngpio ; hwirq++)
439 irq_create_mapping(gpio->domain, hwirq);
440
441 port->gc.to_irq = dwapb_gpio_to_irq;
442 }
443
444 static void dwapb_irq_teardown(struct dwapb_gpio *gpio)
445 {
446 struct dwapb_gpio_port *port = &gpio->ports[0];
447 struct gpio_chip *gc = &port->gc;
448 unsigned int ngpio = gc->ngpio;
449 irq_hw_number_t hwirq;
450
451 if (!gpio->domain)
452 return;
453
454 for (hwirq = 0 ; hwirq < ngpio ; hwirq++)
455 irq_dispose_mapping(irq_find_mapping(gpio->domain, hwirq));
456
457 irq_domain_remove(gpio->domain);
458 gpio->domain = NULL;
459 }
460
461 static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
462 struct dwapb_port_property *pp,
463 unsigned int offs)
464 {
465 struct dwapb_gpio_port *port;
466 void __iomem *dat, *set, *dirout;
467 int err;
468
469 port = &gpio->ports[offs];
470 port->gpio = gpio;
471 port->idx = pp->idx;
472
473 #ifdef CONFIG_PM_SLEEP
474 port->ctx = devm_kzalloc(gpio->dev, sizeof(*port->ctx), GFP_KERNEL);
475 if (!port->ctx)
476 return -ENOMEM;
477 #endif
478
479 dat = gpio->regs + GPIO_EXT_PORTA + (pp->idx * GPIO_EXT_PORT_SIZE);
480 set = gpio->regs + GPIO_SWPORTA_DR + (pp->idx * GPIO_SWPORT_DR_SIZE);
481 dirout = gpio->regs + GPIO_SWPORTA_DDR +
482 (pp->idx * GPIO_SWPORT_DDR_SIZE);
483
484 err = bgpio_init(&port->gc, gpio->dev, 4, dat, set, NULL, dirout,
485 NULL, 0);
486 if (err) {
487 dev_err(gpio->dev, "failed to init gpio chip for port%d\n",
488 port->idx);
489 return err;
490 }
491
492 #ifdef CONFIG_OF_GPIO
493 port->gc.of_node = to_of_node(pp->fwnode);
494 #endif
495 port->gc.ngpio = pp->ngpio;
496 port->gc.base = pp->gpio_base;
497
498 /* Only port A support debounce */
499 if (pp->idx == 0)
500 port->gc.set_config = dwapb_gpio_set_config;
501
502 if (pp->irq)
503 dwapb_configure_irqs(gpio, port, pp);
504
505 err = gpiochip_add_data(&port->gc, port);
506 if (err)
507 dev_err(gpio->dev, "failed to register gpiochip for port%d\n",
508 port->idx);
509 else
510 port->is_registered = true;
511
512 /* Add GPIO-signaled ACPI event support */
513 if (pp->irq)
514 acpi_gpiochip_request_interrupts(&port->gc);
515
516 return err;
517 }
518
519 static void dwapb_gpio_unregister(struct dwapb_gpio *gpio)
520 {
521 unsigned int m;
522
523 for (m = 0; m < gpio->nr_ports; ++m)
524 if (gpio->ports[m].is_registered)
525 gpiochip_remove(&gpio->ports[m].gc);
526 }
527
528 static struct dwapb_platform_data *
529 dwapb_gpio_get_pdata(struct device *dev)
530 {
531 struct fwnode_handle *fwnode;
532 struct dwapb_platform_data *pdata;
533 struct dwapb_port_property *pp;
534 int nports;
535 int i;
536
537 nports = device_get_child_node_count(dev);
538 if (nports == 0)
539 return ERR_PTR(-ENODEV);
540
541 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
542 if (!pdata)
543 return ERR_PTR(-ENOMEM);
544
545 pdata->properties = devm_kcalloc(dev, nports, sizeof(*pp), GFP_KERNEL);
546 if (!pdata->properties)
547 return ERR_PTR(-ENOMEM);
548
549 pdata->nports = nports;
550
551 i = 0;
552 device_for_each_child_node(dev, fwnode) {
553 pp = &pdata->properties[i++];
554 pp->fwnode = fwnode;
555
556 if (fwnode_property_read_u32(fwnode, "reg", &pp->idx) ||
557 pp->idx >= DWAPB_MAX_PORTS) {
558 dev_err(dev,
559 "missing/invalid port index for port%d\n", i);
560 fwnode_handle_put(fwnode);
561 return ERR_PTR(-EINVAL);
562 }
563
564 if (fwnode_property_read_u32(fwnode, "snps,nr-gpios",
565 &pp->ngpio)) {
566 dev_info(dev,
567 "failed to get number of gpios for port%d\n",
568 i);
569 pp->ngpio = 32;
570 }
571
572 /*
573 * Only port A can provide interrupts in all configurations of
574 * the IP.
575 */
576 if (dev->of_node && pp->idx == 0 &&
577 fwnode_property_read_bool(fwnode,
578 "interrupt-controller")) {
579 pp->irq = irq_of_parse_and_map(to_of_node(fwnode), 0);
580 if (!pp->irq)
581 dev_warn(dev, "no irq for port%d\n", pp->idx);
582 }
583
584 if (has_acpi_companion(dev) && pp->idx == 0)
585 pp->irq = platform_get_irq(to_platform_device(dev), 0);
586
587 pp->irq_shared = false;
588 pp->gpio_base = -1;
589 }
590
591 return pdata;
592 }
593
594 static const struct of_device_id dwapb_of_match[] = {
595 { .compatible = "snps,dw-apb-gpio", .data = (void *)0},
596 { .compatible = "apm,xgene-gpio-v2", .data = (void *)GPIO_REG_OFFSET_V2},
597 { /* Sentinel */ }
598 };
599 MODULE_DEVICE_TABLE(of, dwapb_of_match);
600
601 static const struct acpi_device_id dwapb_acpi_match[] = {
602 {"HISI0181", 0},
603 {"APMC0D07", 0},
604 {"APMC0D81", GPIO_REG_OFFSET_V2},
605 { }
606 };
607 MODULE_DEVICE_TABLE(acpi, dwapb_acpi_match);
608
609 static int dwapb_gpio_probe(struct platform_device *pdev)
610 {
611 unsigned int i;
612 struct resource *res;
613 struct dwapb_gpio *gpio;
614 int err;
615 struct device *dev = &pdev->dev;
616 struct dwapb_platform_data *pdata = dev_get_platdata(dev);
617
618 if (!pdata) {
619 pdata = dwapb_gpio_get_pdata(dev);
620 if (IS_ERR(pdata))
621 return PTR_ERR(pdata);
622 }
623
624 if (!pdata->nports)
625 return -ENODEV;
626
627 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
628 if (!gpio)
629 return -ENOMEM;
630
631 gpio->dev = &pdev->dev;
632 gpio->nr_ports = pdata->nports;
633
634 gpio->rst = devm_reset_control_get_optional_shared(dev, NULL);
635 if (IS_ERR(gpio->rst))
636 return PTR_ERR(gpio->rst);
637
638 reset_control_deassert(gpio->rst);
639
640 gpio->ports = devm_kcalloc(&pdev->dev, gpio->nr_ports,
641 sizeof(*gpio->ports), GFP_KERNEL);
642 if (!gpio->ports)
643 return -ENOMEM;
644
645 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
646 gpio->regs = devm_ioremap_resource(&pdev->dev, res);
647 if (IS_ERR(gpio->regs))
648 return PTR_ERR(gpio->regs);
649
650 gpio->flags = 0;
651 if (dev->of_node) {
652 const struct of_device_id *of_devid;
653
654 of_devid = of_match_device(dwapb_of_match, dev);
655 if (of_devid) {
656 if (of_devid->data)
657 gpio->flags = (uintptr_t)of_devid->data;
658 }
659 } else if (has_acpi_companion(dev)) {
660 const struct acpi_device_id *acpi_id;
661
662 acpi_id = acpi_match_device(dwapb_acpi_match, dev);
663 if (acpi_id) {
664 if (acpi_id->driver_data)
665 gpio->flags = acpi_id->driver_data;
666 }
667 }
668
669 for (i = 0; i < gpio->nr_ports; i++) {
670 err = dwapb_gpio_add_port(gpio, &pdata->properties[i], i);
671 if (err)
672 goto out_unregister;
673 }
674 platform_set_drvdata(pdev, gpio);
675
676 return 0;
677
678 out_unregister:
679 dwapb_gpio_unregister(gpio);
680 dwapb_irq_teardown(gpio);
681
682 return err;
683 }
684
685 static int dwapb_gpio_remove(struct platform_device *pdev)
686 {
687 struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
688
689 dwapb_gpio_unregister(gpio);
690 dwapb_irq_teardown(gpio);
691 reset_control_assert(gpio->rst);
692
693 return 0;
694 }
695
696 #ifdef CONFIG_PM_SLEEP
697 static int dwapb_gpio_suspend(struct device *dev)
698 {
699 struct platform_device *pdev = to_platform_device(dev);
700 struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
701 struct gpio_chip *gc = &gpio->ports[0].gc;
702 unsigned long flags;
703 int i;
704
705 spin_lock_irqsave(&gc->bgpio_lock, flags);
706 for (i = 0; i < gpio->nr_ports; i++) {
707 unsigned int offset;
708 unsigned int idx = gpio->ports[i].idx;
709 struct dwapb_context *ctx = gpio->ports[i].ctx;
710
711 BUG_ON(!ctx);
712
713 offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE;
714 ctx->dir = dwapb_read(gpio, offset);
715
716 offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE;
717 ctx->data = dwapb_read(gpio, offset);
718
719 offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE;
720 ctx->ext = dwapb_read(gpio, offset);
721
722 /* Only port A can provide interrupts */
723 if (idx == 0) {
724 ctx->int_mask = dwapb_read(gpio, GPIO_INTMASK);
725 ctx->int_en = dwapb_read(gpio, GPIO_INTEN);
726 ctx->int_pol = dwapb_read(gpio, GPIO_INT_POLARITY);
727 ctx->int_type = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
728 ctx->int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
729
730 /* Mask out interrupts */
731 dwapb_write(gpio, GPIO_INTMASK,
732 0xffffffff & ~ctx->wake_en);
733 }
734 }
735 spin_unlock_irqrestore(&gc->bgpio_lock, flags);
736
737 return 0;
738 }
739
740 static int dwapb_gpio_resume(struct device *dev)
741 {
742 struct platform_device *pdev = to_platform_device(dev);
743 struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
744 struct gpio_chip *gc = &gpio->ports[0].gc;
745 unsigned long flags;
746 int i;
747
748 spin_lock_irqsave(&gc->bgpio_lock, flags);
749 for (i = 0; i < gpio->nr_ports; i++) {
750 unsigned int offset;
751 unsigned int idx = gpio->ports[i].idx;
752 struct dwapb_context *ctx = gpio->ports[i].ctx;
753
754 BUG_ON(!ctx);
755
756 offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE;
757 dwapb_write(gpio, offset, ctx->data);
758
759 offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE;
760 dwapb_write(gpio, offset, ctx->dir);
761
762 offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE;
763 dwapb_write(gpio, offset, ctx->ext);
764
765 /* Only port A can provide interrupts */
766 if (idx == 0) {
767 dwapb_write(gpio, GPIO_INTTYPE_LEVEL, ctx->int_type);
768 dwapb_write(gpio, GPIO_INT_POLARITY, ctx->int_pol);
769 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, ctx->int_deb);
770 dwapb_write(gpio, GPIO_INTEN, ctx->int_en);
771 dwapb_write(gpio, GPIO_INTMASK, ctx->int_mask);
772
773 /* Clear out spurious interrupts */
774 dwapb_write(gpio, GPIO_PORTA_EOI, 0xffffffff);
775 }
776 }
777 spin_unlock_irqrestore(&gc->bgpio_lock, flags);
778
779 return 0;
780 }
781 #endif
782
783 static SIMPLE_DEV_PM_OPS(dwapb_gpio_pm_ops, dwapb_gpio_suspend,
784 dwapb_gpio_resume);
785
786 static struct platform_driver dwapb_gpio_driver = {
787 .driver = {
788 .name = "gpio-dwapb",
789 .pm = &dwapb_gpio_pm_ops,
790 .of_match_table = of_match_ptr(dwapb_of_match),
791 .acpi_match_table = ACPI_PTR(dwapb_acpi_match),
792 },
793 .probe = dwapb_gpio_probe,
794 .remove = dwapb_gpio_remove,
795 };
796
797 module_platform_driver(dwapb_gpio_driver);
798
799 MODULE_LICENSE("GPL");
800 MODULE_AUTHOR("Jamie Iles");
801 MODULE_DESCRIPTION("Synopsys DesignWare APB GPIO driver");
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