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IPoIB: Avoid reading an uninitialized member variable
[linux/fpc-iii.git] / drivers / gpio / gpio-dwapb.c
blobfcd5b0acfc7286af365f163fe647e13263dd4606
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/basic_mmio_gpio.h>
11 #include <linux/err.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/io.h>
15 #include <linux/ioport.h>
16 #include <linux/irq.h>
17 #include <linux/irqdomain.h>
18 #include <linux/module.h>
19 #include <linux/of.h>
20 #include <linux/of_address.h>
21 #include <linux/of_irq.h>
22 #include <linux/platform_device.h>
23 #include <linux/spinlock.h>
24 #include <linux/platform_data/gpio-dwapb.h>
25 #include <linux/slab.h>
26
27 #define GPIO_SWPORTA_DR 0x00
28 #define GPIO_SWPORTA_DDR 0x04
29 #define GPIO_SWPORTB_DR 0x0c
30 #define GPIO_SWPORTB_DDR 0x10
31 #define GPIO_SWPORTC_DR 0x18
32 #define GPIO_SWPORTC_DDR 0x1c
33 #define GPIO_SWPORTD_DR 0x24
34 #define GPIO_SWPORTD_DDR 0x28
35 #define GPIO_INTEN 0x30
36 #define GPIO_INTMASK 0x34
37 #define GPIO_INTTYPE_LEVEL 0x38
38 #define GPIO_INT_POLARITY 0x3c
39 #define GPIO_INTSTATUS 0x40
40 #define GPIO_PORTA_DEBOUNCE 0x48
41 #define GPIO_PORTA_EOI 0x4c
42 #define GPIO_EXT_PORTA 0x50
43 #define GPIO_EXT_PORTB 0x54
44 #define GPIO_EXT_PORTC 0x58
45 #define GPIO_EXT_PORTD 0x5c
46
47 #define DWAPB_MAX_PORTS 4
48 #define GPIO_EXT_PORT_SIZE (GPIO_EXT_PORTB - GPIO_EXT_PORTA)
49 #define GPIO_SWPORT_DR_SIZE (GPIO_SWPORTB_DR - GPIO_SWPORTA_DR)
50 #define GPIO_SWPORT_DDR_SIZE (GPIO_SWPORTB_DDR - GPIO_SWPORTA_DDR)
51
52 struct dwapb_gpio;
53
54 #ifdef CONFIG_PM_SLEEP
55 /* Store GPIO context across system-wide suspend/resume transitions */
56 struct dwapb_context {
57 u32 data;
58 u32 dir;
59 u32 ext;
60 u32 int_en;
61 u32 int_mask;
62 u32 int_type;
63 u32 int_pol;
64 u32 int_deb;
65 };
66 #endif
67
68 struct dwapb_gpio_port {
69 struct bgpio_chip bgc;
70 bool is_registered;
71 struct dwapb_gpio *gpio;
72 #ifdef CONFIG_PM_SLEEP
73 struct dwapb_context *ctx;
74 #endif
75 unsigned int idx;
76 };
77
78 struct dwapb_gpio {
79 struct device *dev;
80 void __iomem *regs;
81 struct dwapb_gpio_port *ports;
82 unsigned int nr_ports;
83 struct irq_domain *domain;
84 };
85
86 static inline struct dwapb_gpio_port *
87 to_dwapb_gpio_port(struct bgpio_chip *bgc)
88 {
89 return container_of(bgc, struct dwapb_gpio_port, bgc);
90 }
91
92 static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset)
93 {
94 struct bgpio_chip *bgc = &gpio->ports[0].bgc;
95 void __iomem *reg_base = gpio->regs;
96
97 return bgc->read_reg(reg_base + offset);
98 }
99
100 static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset,
101 u32 val)
102 {
103 struct bgpio_chip *bgc = &gpio->ports[0].bgc;
104 void __iomem *reg_base = gpio->regs;
105
106 bgc->write_reg(reg_base + offset, val);
107 }
108
109 static int dwapb_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
110 {
111 struct bgpio_chip *bgc = to_bgpio_chip(gc);
112 struct dwapb_gpio_port *port = to_dwapb_gpio_port(bgc);
113 struct dwapb_gpio *gpio = port->gpio;
114
115 return irq_find_mapping(gpio->domain, offset);
116 }
117
118 static void dwapb_toggle_trigger(struct dwapb_gpio *gpio, unsigned int offs)
119 {
120 u32 v = dwapb_read(gpio, GPIO_INT_POLARITY);
121
122 if (gpio_get_value(gpio->ports[0].bgc.gc.base + offs))
123 v &= ~BIT(offs);
124 else
125 v |= BIT(offs);
126
127 dwapb_write(gpio, GPIO_INT_POLARITY, v);
128 }
129
130 static u32 dwapb_do_irq(struct dwapb_gpio *gpio)
131 {
132 u32 irq_status = readl_relaxed(gpio->regs + GPIO_INTSTATUS);
133 u32 ret = irq_status;
134
135 while (irq_status) {
136 int hwirq = fls(irq_status) - 1;
137 int gpio_irq = irq_find_mapping(gpio->domain, hwirq);
138
139 generic_handle_irq(gpio_irq);
140 irq_status &= ~BIT(hwirq);
141
142 if ((irq_get_trigger_type(gpio_irq) & IRQ_TYPE_SENSE_MASK)
143 == IRQ_TYPE_EDGE_BOTH)
144 dwapb_toggle_trigger(gpio, hwirq);
145 }
146
147 return ret;
148 }
149
150 static void dwapb_irq_handler(struct irq_desc *desc)
151 {
152 struct dwapb_gpio *gpio = irq_desc_get_handler_data(desc);
153 struct irq_chip *chip = irq_desc_get_chip(desc);
154
155 dwapb_do_irq(gpio);
156
157 if (chip->irq_eoi)
158 chip->irq_eoi(irq_desc_get_irq_data(desc));
159 }
160
161 static void dwapb_irq_enable(struct irq_data *d)
162 {
163 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
164 struct dwapb_gpio *gpio = igc->private;
165 struct bgpio_chip *bgc = &gpio->ports[0].bgc;
166 unsigned long flags;
167 u32 val;
168
169 spin_lock_irqsave(&bgc->lock, flags);
170 val = dwapb_read(gpio, GPIO_INTEN);
171 val |= BIT(d->hwirq);
172 dwapb_write(gpio, GPIO_INTEN, val);
173 spin_unlock_irqrestore(&bgc->lock, flags);
174 }
175
176 static void dwapb_irq_disable(struct irq_data *d)
177 {
178 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
179 struct dwapb_gpio *gpio = igc->private;
180 struct bgpio_chip *bgc = &gpio->ports[0].bgc;
181 unsigned long flags;
182 u32 val;
183
184 spin_lock_irqsave(&bgc->lock, flags);
185 val = dwapb_read(gpio, GPIO_INTEN);
186 val &= ~BIT(d->hwirq);
187 dwapb_write(gpio, GPIO_INTEN, val);
188 spin_unlock_irqrestore(&bgc->lock, flags);
189 }
190
191 static int dwapb_irq_reqres(struct irq_data *d)
192 {
193 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
194 struct dwapb_gpio *gpio = igc->private;
195 struct bgpio_chip *bgc = &gpio->ports[0].bgc;
196
197 if (gpiochip_lock_as_irq(&bgc->gc, irqd_to_hwirq(d))) {
198 dev_err(gpio->dev, "unable to lock HW IRQ %lu for IRQ\n",
199 irqd_to_hwirq(d));
200 return -EINVAL;
201 }
202 return 0;
203 }
204
205 static void dwapb_irq_relres(struct irq_data *d)
206 {
207 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
208 struct dwapb_gpio *gpio = igc->private;
209 struct bgpio_chip *bgc = &gpio->ports[0].bgc;
210
211 gpiochip_unlock_as_irq(&bgc->gc, irqd_to_hwirq(d));
212 }
213
214 static int dwapb_irq_set_type(struct irq_data *d, u32 type)
215 {
216 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
217 struct dwapb_gpio *gpio = igc->private;
218 struct bgpio_chip *bgc = &gpio->ports[0].bgc;
219 int bit = d->hwirq;
220 unsigned long level, polarity, flags;
221
222 if (type & ~(IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
223 IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
224 return -EINVAL;
225
226 spin_lock_irqsave(&bgc->lock, flags);
227 level = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
228 polarity = dwapb_read(gpio, GPIO_INT_POLARITY);
229
230 switch (type) {
231 case IRQ_TYPE_EDGE_BOTH:
232 level |= BIT(bit);
233 dwapb_toggle_trigger(gpio, bit);
234 break;
235 case IRQ_TYPE_EDGE_RISING:
236 level |= BIT(bit);
237 polarity |= BIT(bit);
238 break;
239 case IRQ_TYPE_EDGE_FALLING:
240 level |= BIT(bit);
241 polarity &= ~BIT(bit);
242 break;
243 case IRQ_TYPE_LEVEL_HIGH:
244 level &= ~BIT(bit);
245 polarity |= BIT(bit);
246 break;
247 case IRQ_TYPE_LEVEL_LOW:
248 level &= ~BIT(bit);
249 polarity &= ~BIT(bit);
250 break;
251 }
252
253 irq_setup_alt_chip(d, type);
254
255 dwapb_write(gpio, GPIO_INTTYPE_LEVEL, level);
256 dwapb_write(gpio, GPIO_INT_POLARITY, polarity);
257 spin_unlock_irqrestore(&bgc->lock, flags);
258
259 return 0;
260 }
261
262 static int dwapb_gpio_set_debounce(struct gpio_chip *gc,
263 unsigned offset, unsigned debounce)
264 {
265 struct bgpio_chip *bgc = to_bgpio_chip(gc);
266 struct dwapb_gpio_port *port = to_dwapb_gpio_port(bgc);
267 struct dwapb_gpio *gpio = port->gpio;
268 unsigned long flags, val_deb;
269 unsigned long mask = bgc->pin2mask(bgc, offset);
270
271 spin_lock_irqsave(&bgc->lock, flags);
272
273 val_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
274 if (debounce)
275 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb | mask);
276 else
277 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb & ~mask);
278
279 spin_unlock_irqrestore(&bgc->lock, flags);
280
281 return 0;
282 }
283
284 static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id)
285 {
286 u32 worked;
287 struct dwapb_gpio *gpio = dev_id;
288
289 worked = dwapb_do_irq(gpio);
290
291 return worked ? IRQ_HANDLED : IRQ_NONE;
292 }
293
294 static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
295 struct dwapb_gpio_port *port,
296 struct dwapb_port_property *pp)
297 {
298 struct gpio_chip *gc = &port->bgc.gc;
299 struct device_node *node = pp->node;
300 struct irq_chip_generic *irq_gc = NULL;
301 unsigned int hwirq, ngpio = gc->ngpio;
302 struct irq_chip_type *ct;
303 int err, i;
304
305 gpio->domain = irq_domain_add_linear(node, ngpio,
306 &irq_generic_chip_ops, gpio);
307 if (!gpio->domain)
308 return;
309
310 err = irq_alloc_domain_generic_chips(gpio->domain, ngpio, 2,
311 "gpio-dwapb", handle_level_irq,
312 IRQ_NOREQUEST, 0,
313 IRQ_GC_INIT_NESTED_LOCK);
314 if (err) {
315 dev_info(gpio->dev, "irq_alloc_domain_generic_chips failed\n");
316 irq_domain_remove(gpio->domain);
317 gpio->domain = NULL;
318 return;
319 }
320
321 irq_gc = irq_get_domain_generic_chip(gpio->domain, 0);
322 if (!irq_gc) {
323 irq_domain_remove(gpio->domain);
324 gpio->domain = NULL;
325 return;
326 }
327
328 irq_gc->reg_base = gpio->regs;
329 irq_gc->private = gpio;
330
331 for (i = 0; i < 2; i++) {
332 ct = &irq_gc->chip_types[i];
333 ct->chip.irq_ack = irq_gc_ack_set_bit;
334 ct->chip.irq_mask = irq_gc_mask_set_bit;
335 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
336 ct->chip.irq_set_type = dwapb_irq_set_type;
337 ct->chip.irq_enable = dwapb_irq_enable;
338 ct->chip.irq_disable = dwapb_irq_disable;
339 ct->chip.irq_request_resources = dwapb_irq_reqres;
340 ct->chip.irq_release_resources = dwapb_irq_relres;
341 ct->regs.ack = GPIO_PORTA_EOI;
342 ct->regs.mask = GPIO_INTMASK;
343 ct->type = IRQ_TYPE_LEVEL_MASK;
344 }
345
346 irq_gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK;
347 irq_gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH;
348 irq_gc->chip_types[1].handler = handle_edge_irq;
349
350 if (!pp->irq_shared) {
351 irq_set_chained_handler_and_data(pp->irq, dwapb_irq_handler,
352 gpio);
353 } else {
354 /*
355 * Request a shared IRQ since where MFD would have devices
356 * using the same irq pin
357 */
358 err = devm_request_irq(gpio->dev, pp->irq,
359 dwapb_irq_handler_mfd,
360 IRQF_SHARED, "gpio-dwapb-mfd", gpio);
361 if (err) {
362 dev_err(gpio->dev, "error requesting IRQ\n");
363 irq_domain_remove(gpio->domain);
364 gpio->domain = NULL;
365 return;
366 }
367 }
368
369 for (hwirq = 0 ; hwirq < ngpio ; hwirq++)
370 irq_create_mapping(gpio->domain, hwirq);
371
372 port->bgc.gc.to_irq = dwapb_gpio_to_irq;
373 }
374
375 static void dwapb_irq_teardown(struct dwapb_gpio *gpio)
376 {
377 struct dwapb_gpio_port *port = &gpio->ports[0];
378 struct gpio_chip *gc = &port->bgc.gc;
379 unsigned int ngpio = gc->ngpio;
380 irq_hw_number_t hwirq;
381
382 if (!gpio->domain)
383 return;
384
385 for (hwirq = 0 ; hwirq < ngpio ; hwirq++)
386 irq_dispose_mapping(irq_find_mapping(gpio->domain, hwirq));
387
388 irq_domain_remove(gpio->domain);
389 gpio->domain = NULL;
390 }
391
392 static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
393 struct dwapb_port_property *pp,
394 unsigned int offs)
395 {
396 struct dwapb_gpio_port *port;
397 void __iomem *dat, *set, *dirout;
398 int err;
399
400 port = &gpio->ports[offs];
401 port->gpio = gpio;
402 port->idx = pp->idx;
403
404 #ifdef CONFIG_PM_SLEEP
405 port->ctx = devm_kzalloc(gpio->dev, sizeof(*port->ctx), GFP_KERNEL);
406 if (!port->ctx)
407 return -ENOMEM;
408 #endif
409
410 dat = gpio->regs + GPIO_EXT_PORTA + (pp->idx * GPIO_EXT_PORT_SIZE);
411 set = gpio->regs + GPIO_SWPORTA_DR + (pp->idx * GPIO_SWPORT_DR_SIZE);
412 dirout = gpio->regs + GPIO_SWPORTA_DDR +
413 (pp->idx * GPIO_SWPORT_DDR_SIZE);
414
415 err = bgpio_init(&port->bgc, gpio->dev, 4, dat, set, NULL, dirout,
416 NULL, false);
417 if (err) {
418 dev_err(gpio->dev, "failed to init gpio chip for %s\n",
419 pp->name);
420 return err;
421 }
422
423 #ifdef CONFIG_OF_GPIO
424 port->bgc.gc.of_node = pp->node;
425 #endif
426 port->bgc.gc.ngpio = pp->ngpio;
427 port->bgc.gc.base = pp->gpio_base;
428
429 /* Only port A support debounce */
430 if (pp->idx == 0)
431 port->bgc.gc.set_debounce = dwapb_gpio_set_debounce;
432
433 if (pp->irq)
434 dwapb_configure_irqs(gpio, port, pp);
435
436 err = gpiochip_add(&port->bgc.gc);
437 if (err)
438 dev_err(gpio->dev, "failed to register gpiochip for %s\n",
439 pp->name);
440 else
441 port->is_registered = true;
442
443 return err;
444 }
445
446 static void dwapb_gpio_unregister(struct dwapb_gpio *gpio)
447 {
448 unsigned int m;
449
450 for (m = 0; m < gpio->nr_ports; ++m)
451 if (gpio->ports[m].is_registered)
452 gpiochip_remove(&gpio->ports[m].bgc.gc);
453 }
454
455 static struct dwapb_platform_data *
456 dwapb_gpio_get_pdata_of(struct device *dev)
457 {
458 struct device_node *node, *port_np;
459 struct dwapb_platform_data *pdata;
460 struct dwapb_port_property *pp;
461 int nports;
462 int i;
463
464 node = dev->of_node;
465 if (!IS_ENABLED(CONFIG_OF_GPIO) || !node)
466 return ERR_PTR(-ENODEV);
467
468 nports = of_get_child_count(node);
469 if (nports == 0)
470 return ERR_PTR(-ENODEV);
471
472 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
473 if (!pdata)
474 return ERR_PTR(-ENOMEM);
475
476 pdata->properties = devm_kcalloc(dev, nports, sizeof(*pp), GFP_KERNEL);
477 if (!pdata->properties)
478 return ERR_PTR(-ENOMEM);
479
480 pdata->nports = nports;
481
482 i = 0;
483 for_each_child_of_node(node, port_np) {
484 pp = &pdata->properties[i++];
485 pp->node = port_np;
486
487 if (of_property_read_u32(port_np, "reg", &pp->idx) ||
488 pp->idx >= DWAPB_MAX_PORTS) {
489 dev_err(dev, "missing/invalid port index for %s\n",
490 port_np->full_name);
491 return ERR_PTR(-EINVAL);
492 }
493
494 if (of_property_read_u32(port_np, "snps,nr-gpios",
495 &pp->ngpio)) {
496 dev_info(dev, "failed to get number of gpios for %s\n",
497 port_np->full_name);
498 pp->ngpio = 32;
499 }
500
501 /*
502 * Only port A can provide interrupts in all configurations of
503 * the IP.
504 */
505 if (pp->idx == 0 &&
506 of_property_read_bool(port_np, "interrupt-controller")) {
507 pp->irq = irq_of_parse_and_map(port_np, 0);
508 if (!pp->irq) {
509 dev_warn(dev, "no irq for bank %s\n",
510 port_np->full_name);
511 }
512 }
513
514 pp->irq_shared = false;
515 pp->gpio_base = -1;
516 pp->name = port_np->full_name;
517 }
518
519 return pdata;
520 }
521
522 static int dwapb_gpio_probe(struct platform_device *pdev)
523 {
524 unsigned int i;
525 struct resource *res;
526 struct dwapb_gpio *gpio;
527 int err;
528 struct device *dev = &pdev->dev;
529 struct dwapb_platform_data *pdata = dev_get_platdata(dev);
530
531 if (!pdata) {
532 pdata = dwapb_gpio_get_pdata_of(dev);
533 if (IS_ERR(pdata))
534 return PTR_ERR(pdata);
535 }
536
537 if (!pdata->nports)
538 return -ENODEV;
539
540 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
541 if (!gpio)
542 return -ENOMEM;
543
544 gpio->dev = &pdev->dev;
545 gpio->nr_ports = pdata->nports;
546
547 gpio->ports = devm_kcalloc(&pdev->dev, gpio->nr_ports,
548 sizeof(*gpio->ports), GFP_KERNEL);
549 if (!gpio->ports)
550 return -ENOMEM;
551
552 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
553 gpio->regs = devm_ioremap_resource(&pdev->dev, res);
554 if (IS_ERR(gpio->regs))
555 return PTR_ERR(gpio->regs);
556
557 for (i = 0; i < gpio->nr_ports; i++) {
558 err = dwapb_gpio_add_port(gpio, &pdata->properties[i], i);
559 if (err)
560 goto out_unregister;
561 }
562 platform_set_drvdata(pdev, gpio);
563
564 return 0;
565
566 out_unregister:
567 dwapb_gpio_unregister(gpio);
568 dwapb_irq_teardown(gpio);
569
570 return err;
571 }
572
573 static int dwapb_gpio_remove(struct platform_device *pdev)
574 {
575 struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
576
577 dwapb_gpio_unregister(gpio);
578 dwapb_irq_teardown(gpio);
579
580 return 0;
581 }
582
583 static const struct of_device_id dwapb_of_match[] = {
584 { .compatible = "snps,dw-apb-gpio" },
585 { /* Sentinel */ }
586 };
587 MODULE_DEVICE_TABLE(of, dwapb_of_match);
588
589 #ifdef CONFIG_PM_SLEEP
590 static int dwapb_gpio_suspend(struct device *dev)
591 {
592 struct platform_device *pdev = to_platform_device(dev);
593 struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
594 struct bgpio_chip *bgc = &gpio->ports[0].bgc;
595 unsigned long flags;
596 int i;
597
598 spin_lock_irqsave(&bgc->lock, flags);
599 for (i = 0; i < gpio->nr_ports; i++) {
600 unsigned int offset;
601 unsigned int idx = gpio->ports[i].idx;
602 struct dwapb_context *ctx = gpio->ports[i].ctx;
603
604 BUG_ON(!ctx);
605
606 offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE;
607 ctx->dir = dwapb_read(gpio, offset);
608
609 offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE;
610 ctx->data = dwapb_read(gpio, offset);
611
612 offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE;
613 ctx->ext = dwapb_read(gpio, offset);
614
615 /* Only port A can provide interrupts */
616 if (idx == 0) {
617 ctx->int_mask = dwapb_read(gpio, GPIO_INTMASK);
618 ctx->int_en = dwapb_read(gpio, GPIO_INTEN);
619 ctx->int_pol = dwapb_read(gpio, GPIO_INT_POLARITY);
620 ctx->int_type = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
621 ctx->int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
622
623 /* Mask out interrupts */
624 dwapb_write(gpio, GPIO_INTMASK, 0xffffffff);
625 }
626 }
627 spin_unlock_irqrestore(&bgc->lock, flags);
628
629 return 0;
630 }
631
632 static int dwapb_gpio_resume(struct device *dev)
633 {
634 struct platform_device *pdev = to_platform_device(dev);
635 struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
636 struct bgpio_chip *bgc = &gpio->ports[0].bgc;
637 unsigned long flags;
638 int i;
639
640 spin_lock_irqsave(&bgc->lock, flags);
641 for (i = 0; i < gpio->nr_ports; i++) {
642 unsigned int offset;
643 unsigned int idx = gpio->ports[i].idx;
644 struct dwapb_context *ctx = gpio->ports[i].ctx;
645
646 BUG_ON(!ctx);
647
648 offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE;
649 dwapb_write(gpio, offset, ctx->data);
650
651 offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE;
652 dwapb_write(gpio, offset, ctx->dir);
653
654 offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE;
655 dwapb_write(gpio, offset, ctx->ext);
656
657 /* Only port A can provide interrupts */
658 if (idx == 0) {
659 dwapb_write(gpio, GPIO_INTTYPE_LEVEL, ctx->int_type);
660 dwapb_write(gpio, GPIO_INT_POLARITY, ctx->int_pol);
661 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, ctx->int_deb);
662 dwapb_write(gpio, GPIO_INTEN, ctx->int_en);
663 dwapb_write(gpio, GPIO_INTMASK, ctx->int_mask);
664
665 /* Clear out spurious interrupts */
666 dwapb_write(gpio, GPIO_PORTA_EOI, 0xffffffff);
667 }
668 }
669 spin_unlock_irqrestore(&bgc->lock, flags);
670
671 return 0;
672 }
673 #endif
674
675 static SIMPLE_DEV_PM_OPS(dwapb_gpio_pm_ops, dwapb_gpio_suspend,
676 dwapb_gpio_resume);
677
678 static struct platform_driver dwapb_gpio_driver = {
679 .driver = {
680 .name = "gpio-dwapb",
681 .pm = &dwapb_gpio_pm_ops,
682 .of_match_table = of_match_ptr(dwapb_of_match),
683 },
684 .probe = dwapb_gpio_probe,
685 .remove = dwapb_gpio_remove,
686 };
687
688 module_platform_driver(dwapb_gpio_driver);
689
690 MODULE_LICENSE("GPL");
691 MODULE_AUTHOR("Jamie Iles");
692 MODULE_DESCRIPTION("Synopsys DesignWare APB GPIO driver");
Linux with added FPC-III support