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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2008, 2009 Provigent Ltd.
4 *
5 * Author: Baruch Siach <baruch@tkos.co.il>
6 *
7 * Driver for the ARM PrimeCell(tm) General Purpose Input/Output (PL061)
8 *
9 * Data sheet: ARM DDI 0190B, September 2000
10 */
11#include <linux/amba/bus.h>
12#include <linux/bitops.h>
13#include <linux/device.h>
14#include <linux/errno.h>
15#include <linux/gpio/driver.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/io.h>
19#include <linux/ioport.h>
20#include <linux/irq.h>
21#include <linux/irqchip/chained_irq.h>
22#include <linux/module.h>
23#include <linux/pinctrl/consumer.h>
24#include <linux/pm.h>
25#include <linux/seq_file.h>
26#include <linux/slab.h>
27#include <linux/spinlock.h>
28
29#define GPIODIR 0x400
30#define GPIOIS 0x404
31#define GPIOIBE 0x408
32#define GPIOIEV 0x40C
33#define GPIOIE 0x410
34#define GPIORIS 0x414
35#define GPIOMIS 0x418
36#define GPIOIC 0x41C
37
38#define PL061_GPIO_NR 8
39
40#ifdef CONFIG_PM
41struct pl061_context_save_regs {
42 u8 gpio_data;
43 u8 gpio_dir;
44 u8 gpio_is;
45 u8 gpio_ibe;
46 u8 gpio_iev;
47 u8 gpio_ie;
48};
49#endif
50
51struct pl061 {
52 raw_spinlock_t lock;
53
54 void __iomem *base;
55 struct gpio_chip gc;
56 int parent_irq;
57
58#ifdef CONFIG_PM
59 struct pl061_context_save_regs csave_regs;
60#endif
61};
62
63static int pl061_get_direction(struct gpio_chip *gc, unsigned offset)
64{
65 struct pl061 *pl061 = gpiochip_get_data(gc);
66
67 if (readb(pl061->base + GPIODIR) & BIT(offset))
68 return GPIO_LINE_DIRECTION_OUT;
69
70 return GPIO_LINE_DIRECTION_IN;
71}
72
73static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
74{
75 struct pl061 *pl061 = gpiochip_get_data(gc);
76 unsigned long flags;
77 unsigned char gpiodir;
78
79 raw_spin_lock_irqsave(&pl061->lock, flags);
80 gpiodir = readb(pl061->base + GPIODIR);
81 gpiodir &= ~(BIT(offset));
82 writeb(gpiodir, pl061->base + GPIODIR);
83 raw_spin_unlock_irqrestore(&pl061->lock, flags);
84
85 return 0;
86}
87
88static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
89 int value)
90{
91 struct pl061 *pl061 = gpiochip_get_data(gc);
92 unsigned long flags;
93 unsigned char gpiodir;
94
95 raw_spin_lock_irqsave(&pl061->lock, flags);
96 writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
97 gpiodir = readb(pl061->base + GPIODIR);
98 gpiodir |= BIT(offset);
99 writeb(gpiodir, pl061->base + GPIODIR);
100
101 /*
102 * gpio value is set again, because pl061 doesn't allow to set value of
103 * a gpio pin before configuring it in OUT mode.
104 */
105 writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
106 raw_spin_unlock_irqrestore(&pl061->lock, flags);
107
108 return 0;
109}
110
111static int pl061_get_value(struct gpio_chip *gc, unsigned offset)
112{
113 struct pl061 *pl061 = gpiochip_get_data(gc);
114
115 return !!readb(pl061->base + (BIT(offset + 2)));
116}
117
118static void pl061_set_value(struct gpio_chip *gc, unsigned offset, int value)
119{
120 struct pl061 *pl061 = gpiochip_get_data(gc);
121
122 writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
123}
124
125static int pl061_irq_type(struct irq_data *d, unsigned trigger)
126{
127 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
128 struct pl061 *pl061 = gpiochip_get_data(gc);
129 int offset = irqd_to_hwirq(d);
130 unsigned long flags;
131 u8 gpiois, gpioibe, gpioiev;
132 u8 bit = BIT(offset);
133
134 if (offset < 0 || offset >= PL061_GPIO_NR)
135 return -EINVAL;
136
137 if ((trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) &&
138 (trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)))
139 {
140 dev_err(gc->parent,
141 "trying to configure line %d for both level and edge "
142 "detection, choose one!\n",
143 offset);
144 return -EINVAL;
145 }
146
147
148 raw_spin_lock_irqsave(&pl061->lock, flags);
149
150 gpioiev = readb(pl061->base + GPIOIEV);
151 gpiois = readb(pl061->base + GPIOIS);
152 gpioibe = readb(pl061->base + GPIOIBE);
153
154 if (trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
155 bool polarity = trigger & IRQ_TYPE_LEVEL_HIGH;
156
157 /* Disable edge detection */
158 gpioibe &= ~bit;
159 /* Enable level detection */
160 gpiois |= bit;
161 /* Select polarity */
162 if (polarity)
163 gpioiev |= bit;
164 else
165 gpioiev &= ~bit;
166 irq_set_handler_locked(d, handle_level_irq);
167 dev_dbg(gc->parent, "line %d: IRQ on %s level\n",
168 offset,
169 polarity ? "HIGH" : "LOW");
170 } else if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
171 /* Disable level detection */
172 gpiois &= ~bit;
173 /* Select both edges, setting this makes GPIOEV be ignored */
174 gpioibe |= bit;
175 irq_set_handler_locked(d, handle_edge_irq);
176 dev_dbg(gc->parent, "line %d: IRQ on both edges\n", offset);
177 } else if ((trigger & IRQ_TYPE_EDGE_RISING) ||
178 (trigger & IRQ_TYPE_EDGE_FALLING)) {
179 bool rising = trigger & IRQ_TYPE_EDGE_RISING;
180
181 /* Disable level detection */
182 gpiois &= ~bit;
183 /* Clear detection on both edges */
184 gpioibe &= ~bit;
185 /* Select edge */
186 if (rising)
187 gpioiev |= bit;
188 else
189 gpioiev &= ~bit;
190 irq_set_handler_locked(d, handle_edge_irq);
191 dev_dbg(gc->parent, "line %d: IRQ on %s edge\n",
192 offset,
193 rising ? "RISING" : "FALLING");
194 } else {
195 /* No trigger: disable everything */
196 gpiois &= ~bit;
197 gpioibe &= ~bit;
198 gpioiev &= ~bit;
199 irq_set_handler_locked(d, handle_bad_irq);
200 dev_warn(gc->parent, "no trigger selected for line %d\n",
201 offset);
202 }
203
204 writeb(gpiois, pl061->base + GPIOIS);
205 writeb(gpioibe, pl061->base + GPIOIBE);
206 writeb(gpioiev, pl061->base + GPIOIEV);
207
208 raw_spin_unlock_irqrestore(&pl061->lock, flags);
209
210 return 0;
211}
212
213static void pl061_irq_handler(struct irq_desc *desc)
214{
215 unsigned long pending;
216 int offset;
217 struct gpio_chip *gc = irq_desc_get_handler_data(desc);
218 struct pl061 *pl061 = gpiochip_get_data(gc);
219 struct irq_chip *irqchip = irq_desc_get_chip(desc);
220
221 chained_irq_enter(irqchip, desc);
222
223 pending = readb(pl061->base + GPIOMIS);
224 if (pending) {
225 for_each_set_bit(offset, &pending, PL061_GPIO_NR)
226 generic_handle_domain_irq(gc->irq.domain,
227 offset);
228 }
229
230 chained_irq_exit(irqchip, desc);
231}
232
233static void pl061_irq_mask(struct irq_data *d)
234{
235 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
236 struct pl061 *pl061 = gpiochip_get_data(gc);
237 u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
238 u8 gpioie;
239
240 raw_spin_lock(&pl061->lock);
241 gpioie = readb(pl061->base + GPIOIE) & ~mask;
242 writeb(gpioie, pl061->base + GPIOIE);
243 raw_spin_unlock(&pl061->lock);
244
245 gpiochip_disable_irq(gc, d->hwirq);
246}
247
248static void pl061_irq_unmask(struct irq_data *d)
249{
250 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
251 struct pl061 *pl061 = gpiochip_get_data(gc);
252 u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
253 u8 gpioie;
254
255 gpiochip_enable_irq(gc, d->hwirq);
256
257 raw_spin_lock(&pl061->lock);
258 gpioie = readb(pl061->base + GPIOIE) | mask;
259 writeb(gpioie, pl061->base + GPIOIE);
260 raw_spin_unlock(&pl061->lock);
261}
262
263/**
264 * pl061_irq_ack() - ACK an edge IRQ
265 * @d: IRQ data for this IRQ
266 *
267 * This gets called from the edge IRQ handler to ACK the edge IRQ
268 * in the GPIOIC (interrupt-clear) register. For level IRQs this is
269 * not needed: these go away when the level signal goes away.
270 */
271static void pl061_irq_ack(struct irq_data *d)
272{
273 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
274 struct pl061 *pl061 = gpiochip_get_data(gc);
275 u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
276
277 raw_spin_lock(&pl061->lock);
278 writeb(mask, pl061->base + GPIOIC);
279 raw_spin_unlock(&pl061->lock);
280}
281
282static int pl061_irq_set_wake(struct irq_data *d, unsigned int state)
283{
284 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
285 struct pl061 *pl061 = gpiochip_get_data(gc);
286
287 return irq_set_irq_wake(pl061->parent_irq, state);
288}
289
290static void pl061_irq_print_chip(struct irq_data *data, struct seq_file *p)
291{
292 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
293
294 seq_puts(p, dev_name(gc->parent));
295}
296
297static const struct irq_chip pl061_irq_chip = {
298 .irq_ack = pl061_irq_ack,
299 .irq_mask = pl061_irq_mask,
300 .irq_unmask = pl061_irq_unmask,
301 .irq_set_type = pl061_irq_type,
302 .irq_set_wake = pl061_irq_set_wake,
303 .irq_print_chip = pl061_irq_print_chip,
304 .flags = IRQCHIP_IMMUTABLE,
305 GPIOCHIP_IRQ_RESOURCE_HELPERS,
306};
307
308static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
309{
310 struct device *dev = &adev->dev;
311 struct pl061 *pl061;
312 struct gpio_irq_chip *girq;
313 int ret, irq;
314
315 pl061 = devm_kzalloc(dev, sizeof(*pl061), GFP_KERNEL);
316 if (pl061 == NULL)
317 return -ENOMEM;
318
319 pl061->base = devm_ioremap_resource(dev, &adev->res);
320 if (IS_ERR(pl061->base))
321 return PTR_ERR(pl061->base);
322
323 raw_spin_lock_init(&pl061->lock);
324 pl061->gc.request = gpiochip_generic_request;
325 pl061->gc.free = gpiochip_generic_free;
326 pl061->gc.base = -1;
327 pl061->gc.get_direction = pl061_get_direction;
328 pl061->gc.direction_input = pl061_direction_input;
329 pl061->gc.direction_output = pl061_direction_output;
330 pl061->gc.get = pl061_get_value;
331 pl061->gc.set = pl061_set_value;
332 pl061->gc.ngpio = PL061_GPIO_NR;
333 pl061->gc.label = dev_name(dev);
334 pl061->gc.parent = dev;
335 pl061->gc.owner = THIS_MODULE;
336
337 /*
338 * irq_chip support
339 */
340 writeb(0, pl061->base + GPIOIE); /* disable irqs */
341 irq = adev->irq[0];
342 if (!irq)
343 dev_warn(&adev->dev, "IRQ support disabled\n");
344 pl061->parent_irq = irq;
345
346 girq = &pl061->gc.irq;
347 gpio_irq_chip_set_chip(girq, &pl061_irq_chip);
348 girq->parent_handler = pl061_irq_handler;
349 girq->num_parents = 1;
350 girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents),
351 GFP_KERNEL);
352 if (!girq->parents)
353 return -ENOMEM;
354 girq->parents[0] = irq;
355 girq->default_type = IRQ_TYPE_NONE;
356 girq->handler = handle_bad_irq;
357
358 ret = devm_gpiochip_add_data(dev, &pl061->gc, pl061);
359 if (ret)
360 return ret;
361
362 amba_set_drvdata(adev, pl061);
363 dev_info(dev, "PL061 GPIO chip registered\n");
364
365 return 0;
366}
367
368#ifdef CONFIG_PM
369static int pl061_suspend(struct device *dev)
370{
371 struct pl061 *pl061 = dev_get_drvdata(dev);
372 int offset;
373
374 pl061->csave_regs.gpio_data = 0;
375 pl061->csave_regs.gpio_dir = readb(pl061->base + GPIODIR);
376 pl061->csave_regs.gpio_is = readb(pl061->base + GPIOIS);
377 pl061->csave_regs.gpio_ibe = readb(pl061->base + GPIOIBE);
378 pl061->csave_regs.gpio_iev = readb(pl061->base + GPIOIEV);
379 pl061->csave_regs.gpio_ie = readb(pl061->base + GPIOIE);
380
381 for (offset = 0; offset < PL061_GPIO_NR; offset++) {
382 if (pl061->csave_regs.gpio_dir & (BIT(offset)))
383 pl061->csave_regs.gpio_data |=
384 pl061_get_value(&pl061->gc, offset) << offset;
385 }
386
387 return 0;
388}
389
390static int pl061_resume(struct device *dev)
391{
392 struct pl061 *pl061 = dev_get_drvdata(dev);
393 int offset;
394
395 for (offset = 0; offset < PL061_GPIO_NR; offset++) {
396 if (pl061->csave_regs.gpio_dir & (BIT(offset)))
397 pl061_direction_output(&pl061->gc, offset,
398 pl061->csave_regs.gpio_data &
399 (BIT(offset)));
400 else
401 pl061_direction_input(&pl061->gc, offset);
402 }
403
404 writeb(pl061->csave_regs.gpio_is, pl061->base + GPIOIS);
405 writeb(pl061->csave_regs.gpio_ibe, pl061->base + GPIOIBE);
406 writeb(pl061->csave_regs.gpio_iev, pl061->base + GPIOIEV);
407 writeb(pl061->csave_regs.gpio_ie, pl061->base + GPIOIE);
408
409 return 0;
410}
411
412static const struct dev_pm_ops pl061_dev_pm_ops = {
413 .suspend = pl061_suspend,
414 .resume = pl061_resume,
415 .freeze = pl061_suspend,
416 .restore = pl061_resume,
417};
418#endif
419
420static const struct amba_id pl061_ids[] = {
421 {
422 .id = 0x00041061,
423 .mask = 0x000fffff,
424 },
425 { 0, 0 },
426};
427MODULE_DEVICE_TABLE(amba, pl061_ids);
428
429static struct amba_driver pl061_gpio_driver = {
430 .drv = {
431 .name = "pl061_gpio",
432#ifdef CONFIG_PM
433 .pm = &pl061_dev_pm_ops,
434#endif
435 },
436 .id_table = pl061_ids,
437 .probe = pl061_probe,
438};
439module_amba_driver(pl061_gpio_driver);
440
441MODULE_DESCRIPTION("Driver for the ARM PrimeCell(tm) General Purpose Input/Output (PL061)");
442MODULE_LICENSE("GPL v2");
1/*
2 * Copyright (C) 2008, 2009 Provigent Ltd.
3 *
4 * Author: Baruch Siach <baruch@tkos.co.il>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Driver for the ARM PrimeCell(tm) General Purpose Input/Output (PL061)
11 *
12 * Data sheet: ARM DDI 0190B, September 2000
13 */
14#include <linux/spinlock.h>
15#include <linux/errno.h>
16#include <linux/init.h>
17#include <linux/io.h>
18#include <linux/ioport.h>
19#include <linux/interrupt.h>
20#include <linux/irq.h>
21#include <linux/irqchip/chained_irq.h>
22#include <linux/bitops.h>
23#include <linux/gpio.h>
24#include <linux/device.h>
25#include <linux/amba/bus.h>
26#include <linux/slab.h>
27#include <linux/pinctrl/consumer.h>
28#include <linux/pm.h>
29
30#define GPIODIR 0x400
31#define GPIOIS 0x404
32#define GPIOIBE 0x408
33#define GPIOIEV 0x40C
34#define GPIOIE 0x410
35#define GPIORIS 0x414
36#define GPIOMIS 0x418
37#define GPIOIC 0x41C
38
39#define PL061_GPIO_NR 8
40
41#ifdef CONFIG_PM
42struct pl061_context_save_regs {
43 u8 gpio_data;
44 u8 gpio_dir;
45 u8 gpio_is;
46 u8 gpio_ibe;
47 u8 gpio_iev;
48 u8 gpio_ie;
49};
50#endif
51
52struct pl061 {
53 spinlock_t lock;
54
55 void __iomem *base;
56 struct gpio_chip gc;
57 int parent_irq;
58
59#ifdef CONFIG_PM
60 struct pl061_context_save_regs csave_regs;
61#endif
62};
63
64static int pl061_get_direction(struct gpio_chip *gc, unsigned offset)
65{
66 struct pl061 *pl061 = gpiochip_get_data(gc);
67
68 return !(readb(pl061->base + GPIODIR) & BIT(offset));
69}
70
71static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
72{
73 struct pl061 *pl061 = gpiochip_get_data(gc);
74 unsigned long flags;
75 unsigned char gpiodir;
76
77 spin_lock_irqsave(&pl061->lock, flags);
78 gpiodir = readb(pl061->base + GPIODIR);
79 gpiodir &= ~(BIT(offset));
80 writeb(gpiodir, pl061->base + GPIODIR);
81 spin_unlock_irqrestore(&pl061->lock, flags);
82
83 return 0;
84}
85
86static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
87 int value)
88{
89 struct pl061 *pl061 = gpiochip_get_data(gc);
90 unsigned long flags;
91 unsigned char gpiodir;
92
93 spin_lock_irqsave(&pl061->lock, flags);
94 writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
95 gpiodir = readb(pl061->base + GPIODIR);
96 gpiodir |= BIT(offset);
97 writeb(gpiodir, pl061->base + GPIODIR);
98
99 /*
100 * gpio value is set again, because pl061 doesn't allow to set value of
101 * a gpio pin before configuring it in OUT mode.
102 */
103 writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
104 spin_unlock_irqrestore(&pl061->lock, flags);
105
106 return 0;
107}
108
109static int pl061_get_value(struct gpio_chip *gc, unsigned offset)
110{
111 struct pl061 *pl061 = gpiochip_get_data(gc);
112
113 return !!readb(pl061->base + (BIT(offset + 2)));
114}
115
116static void pl061_set_value(struct gpio_chip *gc, unsigned offset, int value)
117{
118 struct pl061 *pl061 = gpiochip_get_data(gc);
119
120 writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
121}
122
123static int pl061_irq_type(struct irq_data *d, unsigned trigger)
124{
125 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
126 struct pl061 *pl061 = gpiochip_get_data(gc);
127 int offset = irqd_to_hwirq(d);
128 unsigned long flags;
129 u8 gpiois, gpioibe, gpioiev;
130 u8 bit = BIT(offset);
131
132 if (offset < 0 || offset >= PL061_GPIO_NR)
133 return -EINVAL;
134
135 if ((trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) &&
136 (trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)))
137 {
138 dev_err(gc->parent,
139 "trying to configure line %d for both level and edge "
140 "detection, choose one!\n",
141 offset);
142 return -EINVAL;
143 }
144
145
146 spin_lock_irqsave(&pl061->lock, flags);
147
148 gpioiev = readb(pl061->base + GPIOIEV);
149 gpiois = readb(pl061->base + GPIOIS);
150 gpioibe = readb(pl061->base + GPIOIBE);
151
152 if (trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
153 bool polarity = trigger & IRQ_TYPE_LEVEL_HIGH;
154
155 /* Disable edge detection */
156 gpioibe &= ~bit;
157 /* Enable level detection */
158 gpiois |= bit;
159 /* Select polarity */
160 if (polarity)
161 gpioiev |= bit;
162 else
163 gpioiev &= ~bit;
164 irq_set_handler_locked(d, handle_level_irq);
165 dev_dbg(gc->parent, "line %d: IRQ on %s level\n",
166 offset,
167 polarity ? "HIGH" : "LOW");
168 } else if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
169 /* Disable level detection */
170 gpiois &= ~bit;
171 /* Select both edges, setting this makes GPIOEV be ignored */
172 gpioibe |= bit;
173 irq_set_handler_locked(d, handle_edge_irq);
174 dev_dbg(gc->parent, "line %d: IRQ on both edges\n", offset);
175 } else if ((trigger & IRQ_TYPE_EDGE_RISING) ||
176 (trigger & IRQ_TYPE_EDGE_FALLING)) {
177 bool rising = trigger & IRQ_TYPE_EDGE_RISING;
178
179 /* Disable level detection */
180 gpiois &= ~bit;
181 /* Clear detection on both edges */
182 gpioibe &= ~bit;
183 /* Select edge */
184 if (rising)
185 gpioiev |= bit;
186 else
187 gpioiev &= ~bit;
188 irq_set_handler_locked(d, handle_edge_irq);
189 dev_dbg(gc->parent, "line %d: IRQ on %s edge\n",
190 offset,
191 rising ? "RISING" : "FALLING");
192 } else {
193 /* No trigger: disable everything */
194 gpiois &= ~bit;
195 gpioibe &= ~bit;
196 gpioiev &= ~bit;
197 irq_set_handler_locked(d, handle_bad_irq);
198 dev_warn(gc->parent, "no trigger selected for line %d\n",
199 offset);
200 }
201
202 writeb(gpiois, pl061->base + GPIOIS);
203 writeb(gpioibe, pl061->base + GPIOIBE);
204 writeb(gpioiev, pl061->base + GPIOIEV);
205
206 spin_unlock_irqrestore(&pl061->lock, flags);
207
208 return 0;
209}
210
211static void pl061_irq_handler(struct irq_desc *desc)
212{
213 unsigned long pending;
214 int offset;
215 struct gpio_chip *gc = irq_desc_get_handler_data(desc);
216 struct pl061 *pl061 = gpiochip_get_data(gc);
217 struct irq_chip *irqchip = irq_desc_get_chip(desc);
218
219 chained_irq_enter(irqchip, desc);
220
221 pending = readb(pl061->base + GPIOMIS);
222 if (pending) {
223 for_each_set_bit(offset, &pending, PL061_GPIO_NR)
224 generic_handle_irq(irq_find_mapping(gc->irqdomain,
225 offset));
226 }
227
228 chained_irq_exit(irqchip, desc);
229}
230
231static void pl061_irq_mask(struct irq_data *d)
232{
233 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
234 struct pl061 *pl061 = gpiochip_get_data(gc);
235 u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
236 u8 gpioie;
237
238 spin_lock(&pl061->lock);
239 gpioie = readb(pl061->base + GPIOIE) & ~mask;
240 writeb(gpioie, pl061->base + GPIOIE);
241 spin_unlock(&pl061->lock);
242}
243
244static void pl061_irq_unmask(struct irq_data *d)
245{
246 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
247 struct pl061 *pl061 = gpiochip_get_data(gc);
248 u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
249 u8 gpioie;
250
251 spin_lock(&pl061->lock);
252 gpioie = readb(pl061->base + GPIOIE) | mask;
253 writeb(gpioie, pl061->base + GPIOIE);
254 spin_unlock(&pl061->lock);
255}
256
257/**
258 * pl061_irq_ack() - ACK an edge IRQ
259 * @d: IRQ data for this IRQ
260 *
261 * This gets called from the edge IRQ handler to ACK the edge IRQ
262 * in the GPIOIC (interrupt-clear) register. For level IRQs this is
263 * not needed: these go away when the level signal goes away.
264 */
265static void pl061_irq_ack(struct irq_data *d)
266{
267 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
268 struct pl061 *pl061 = gpiochip_get_data(gc);
269 u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
270
271 spin_lock(&pl061->lock);
272 writeb(mask, pl061->base + GPIOIC);
273 spin_unlock(&pl061->lock);
274}
275
276static int pl061_irq_set_wake(struct irq_data *d, unsigned int state)
277{
278 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
279 struct pl061 *pl061 = gpiochip_get_data(gc);
280
281 return irq_set_irq_wake(pl061->parent_irq, state);
282}
283
284static struct irq_chip pl061_irqchip = {
285 .name = "pl061",
286 .irq_ack = pl061_irq_ack,
287 .irq_mask = pl061_irq_mask,
288 .irq_unmask = pl061_irq_unmask,
289 .irq_set_type = pl061_irq_type,
290 .irq_set_wake = pl061_irq_set_wake,
291};
292
293static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
294{
295 struct device *dev = &adev->dev;
296 struct pl061 *pl061;
297 int ret, irq;
298
299 pl061 = devm_kzalloc(dev, sizeof(*pl061), GFP_KERNEL);
300 if (pl061 == NULL)
301 return -ENOMEM;
302
303 pl061->base = devm_ioremap_resource(dev, &adev->res);
304 if (IS_ERR(pl061->base))
305 return PTR_ERR(pl061->base);
306
307 spin_lock_init(&pl061->lock);
308 if (of_property_read_bool(dev->of_node, "gpio-ranges")) {
309 pl061->gc.request = gpiochip_generic_request;
310 pl061->gc.free = gpiochip_generic_free;
311 }
312
313 pl061->gc.base = -1;
314 pl061->gc.get_direction = pl061_get_direction;
315 pl061->gc.direction_input = pl061_direction_input;
316 pl061->gc.direction_output = pl061_direction_output;
317 pl061->gc.get = pl061_get_value;
318 pl061->gc.set = pl061_set_value;
319 pl061->gc.ngpio = PL061_GPIO_NR;
320 pl061->gc.label = dev_name(dev);
321 pl061->gc.parent = dev;
322 pl061->gc.owner = THIS_MODULE;
323
324 ret = gpiochip_add_data(&pl061->gc, pl061);
325 if (ret)
326 return ret;
327
328 /*
329 * irq_chip support
330 */
331 writeb(0, pl061->base + GPIOIE); /* disable irqs */
332 irq = adev->irq[0];
333 if (irq < 0) {
334 dev_err(&adev->dev, "invalid IRQ\n");
335 return -ENODEV;
336 }
337 pl061->parent_irq = irq;
338
339 ret = gpiochip_irqchip_add(&pl061->gc, &pl061_irqchip,
340 0, handle_bad_irq,
341 IRQ_TYPE_NONE);
342 if (ret) {
343 dev_info(&adev->dev, "could not add irqchip\n");
344 return ret;
345 }
346 gpiochip_set_chained_irqchip(&pl061->gc, &pl061_irqchip,
347 irq, pl061_irq_handler);
348
349 amba_set_drvdata(adev, pl061);
350 dev_info(&adev->dev, "PL061 GPIO chip @%pa registered\n",
351 &adev->res.start);
352
353 return 0;
354}
355
356#ifdef CONFIG_PM
357static int pl061_suspend(struct device *dev)
358{
359 struct pl061 *pl061 = dev_get_drvdata(dev);
360 int offset;
361
362 pl061->csave_regs.gpio_data = 0;
363 pl061->csave_regs.gpio_dir = readb(pl061->base + GPIODIR);
364 pl061->csave_regs.gpio_is = readb(pl061->base + GPIOIS);
365 pl061->csave_regs.gpio_ibe = readb(pl061->base + GPIOIBE);
366 pl061->csave_regs.gpio_iev = readb(pl061->base + GPIOIEV);
367 pl061->csave_regs.gpio_ie = readb(pl061->base + GPIOIE);
368
369 for (offset = 0; offset < PL061_GPIO_NR; offset++) {
370 if (pl061->csave_regs.gpio_dir & (BIT(offset)))
371 pl061->csave_regs.gpio_data |=
372 pl061_get_value(&pl061->gc, offset) << offset;
373 }
374
375 return 0;
376}
377
378static int pl061_resume(struct device *dev)
379{
380 struct pl061 *pl061 = dev_get_drvdata(dev);
381 int offset;
382
383 for (offset = 0; offset < PL061_GPIO_NR; offset++) {
384 if (pl061->csave_regs.gpio_dir & (BIT(offset)))
385 pl061_direction_output(&pl061->gc, offset,
386 pl061->csave_regs.gpio_data &
387 (BIT(offset)));
388 else
389 pl061_direction_input(&pl061->gc, offset);
390 }
391
392 writeb(pl061->csave_regs.gpio_is, pl061->base + GPIOIS);
393 writeb(pl061->csave_regs.gpio_ibe, pl061->base + GPIOIBE);
394 writeb(pl061->csave_regs.gpio_iev, pl061->base + GPIOIEV);
395 writeb(pl061->csave_regs.gpio_ie, pl061->base + GPIOIE);
396
397 return 0;
398}
399
400static const struct dev_pm_ops pl061_dev_pm_ops = {
401 .suspend = pl061_suspend,
402 .resume = pl061_resume,
403 .freeze = pl061_suspend,
404 .restore = pl061_resume,
405};
406#endif
407
408static struct amba_id pl061_ids[] = {
409 {
410 .id = 0x00041061,
411 .mask = 0x000fffff,
412 },
413 { 0, 0 },
414};
415
416static struct amba_driver pl061_gpio_driver = {
417 .drv = {
418 .name = "pl061_gpio",
419#ifdef CONFIG_PM
420 .pm = &pl061_dev_pm_ops,
421#endif
422 },
423 .id_table = pl061_ids,
424 .probe = pl061_probe,
425};
426
427static int __init pl061_gpio_init(void)
428{
429 return amba_driver_register(&pl061_gpio_driver);
430}
431device_initcall(pl061_gpio_init);