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12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/platform_device.h>
15#include <linux/io.h>
16#include <linux/irq.h>
17#include <linux/slab.h>
18#include <linux/gpio/driver.h>
19#include <linux/bitops.h>
20
21#define EP93XX_GPIO_F_INT_STATUS 0x5c
22#define EP93XX_GPIO_A_INT_STATUS 0xa0
23#define EP93XX_GPIO_B_INT_STATUS 0xbc
24
25
26#define EP93XX_GPIO_LINE_MAX 63
27
28
29#define EP93XX_GPIO_CHIP_NUM 8
30
31
32#define EP93XX_GPIO_LINE_MAX_IRQ 23
33
34#define EP93XX_GPIO_A_IRQ_BASE 64
35#define EP93XX_GPIO_B_IRQ_BASE 72
36
37
38
39
40#define EP93XX_GPIO_F_IRQ_BASE 80
41
42struct ep93xx_gpio_irq_chip {
43 struct irq_chip ic;
44 u8 irq_offset;
45 u8 int_unmasked;
46 u8 int_enabled;
47 u8 int_type1;
48 u8 int_type2;
49 u8 int_debounce;
50};
51
52struct ep93xx_gpio_chip {
53 struct gpio_chip gc;
54 struct ep93xx_gpio_irq_chip *eic;
55};
56
57struct ep93xx_gpio {
58 void __iomem *base;
59 struct ep93xx_gpio_chip gc[EP93XX_GPIO_CHIP_NUM];
60};
61
62#define to_ep93xx_gpio_chip(x) container_of(x, struct ep93xx_gpio_chip, gc)
63
64static struct ep93xx_gpio_irq_chip *to_ep93xx_gpio_irq_chip(struct gpio_chip *gc)
65{
66 struct ep93xx_gpio_chip *egc = to_ep93xx_gpio_chip(gc);
67
68 return egc->eic;
69}
70
71
72
73
74#define EP93XX_INT_TYPE1_OFFSET 0x00
75#define EP93XX_INT_TYPE2_OFFSET 0x04
76#define EP93XX_INT_EOI_OFFSET 0x08
77#define EP93XX_INT_EN_OFFSET 0x0c
78#define EP93XX_INT_STATUS_OFFSET 0x10
79#define EP93XX_INT_RAW_STATUS_OFFSET 0x14
80#define EP93XX_INT_DEBOUNCE_OFFSET 0x18
81
82static void ep93xx_gpio_update_int_params(struct ep93xx_gpio *epg,
83 struct ep93xx_gpio_irq_chip *eic)
84{
85 writeb_relaxed(0, epg->base + eic->irq_offset + EP93XX_INT_EN_OFFSET);
86
87 writeb_relaxed(eic->int_type2,
88 epg->base + eic->irq_offset + EP93XX_INT_TYPE2_OFFSET);
89
90 writeb_relaxed(eic->int_type1,
91 epg->base + eic->irq_offset + EP93XX_INT_TYPE1_OFFSET);
92
93 writeb_relaxed(eic->int_unmasked & eic->int_enabled,
94 epg->base + eic->irq_offset + EP93XX_INT_EN_OFFSET);
95}
96
97static void ep93xx_gpio_int_debounce(struct gpio_chip *gc,
98 unsigned int offset, bool enable)
99{
100 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
101 struct ep93xx_gpio_irq_chip *eic = to_ep93xx_gpio_irq_chip(gc);
102 int port_mask = BIT(offset);
103
104 if (enable)
105 eic->int_debounce |= port_mask;
106 else
107 eic->int_debounce &= ~port_mask;
108
109 writeb(eic->int_debounce,
110 epg->base + eic->irq_offset + EP93XX_INT_DEBOUNCE_OFFSET);
111}
112
113static void ep93xx_gpio_ab_irq_handler(struct irq_desc *desc)
114{
115 struct gpio_chip *gc = irq_desc_get_handler_data(desc);
116 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
117 struct irq_chip *irqchip = irq_desc_get_chip(desc);
118 unsigned long stat;
119 int offset;
120
121 chained_irq_enter(irqchip, desc);
122
123
124
125
126
127
128
129 stat = readb(epg->base + EP93XX_GPIO_A_INT_STATUS);
130 for_each_set_bit(offset, &stat, 8)
131 generic_handle_irq(irq_find_mapping(epg->gc[0].gc.irq.domain,
132 offset));
133
134 stat = readb(epg->base + EP93XX_GPIO_B_INT_STATUS);
135 for_each_set_bit(offset, &stat, 8)
136 generic_handle_irq(irq_find_mapping(epg->gc[1].gc.irq.domain,
137 offset));
138
139 chained_irq_exit(irqchip, desc);
140}
141
142static void ep93xx_gpio_f_irq_handler(struct irq_desc *desc)
143{
144
145
146
147
148
149 struct irq_chip *irqchip = irq_desc_get_chip(desc);
150 unsigned int irq = irq_desc_get_irq(desc);
151 int port_f_idx = ((irq + 1) & 7) ^ 4;
152 int gpio_irq = EP93XX_GPIO_F_IRQ_BASE + port_f_idx;
153
154 chained_irq_enter(irqchip, desc);
155 generic_handle_irq(gpio_irq);
156 chained_irq_exit(irqchip, desc);
157}
158
159static void ep93xx_gpio_irq_ack(struct irq_data *d)
160{
161 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
162 struct ep93xx_gpio_irq_chip *eic = to_ep93xx_gpio_irq_chip(gc);
163 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
164 int port_mask = BIT(d->irq & 7);
165
166 if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) {
167 eic->int_type2 ^= port_mask;
168 ep93xx_gpio_update_int_params(epg, eic);
169 }
170
171 writeb(port_mask, epg->base + eic->irq_offset + EP93XX_INT_EOI_OFFSET);
172}
173
174static void ep93xx_gpio_irq_mask_ack(struct irq_data *d)
175{
176 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
177 struct ep93xx_gpio_irq_chip *eic = to_ep93xx_gpio_irq_chip(gc);
178 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
179 int port_mask = BIT(d->irq & 7);
180
181 if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH)
182 eic->int_type2 ^= port_mask;
183
184 eic->int_unmasked &= ~port_mask;
185 ep93xx_gpio_update_int_params(epg, eic);
186
187 writeb(port_mask, epg->base + eic->irq_offset + EP93XX_INT_EOI_OFFSET);
188}
189
190static void ep93xx_gpio_irq_mask(struct irq_data *d)
191{
192 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
193 struct ep93xx_gpio_irq_chip *eic = to_ep93xx_gpio_irq_chip(gc);
194 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
195
196 eic->int_unmasked &= ~BIT(d->irq & 7);
197 ep93xx_gpio_update_int_params(epg, eic);
198}
199
200static void ep93xx_gpio_irq_unmask(struct irq_data *d)
201{
202 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
203 struct ep93xx_gpio_irq_chip *eic = to_ep93xx_gpio_irq_chip(gc);
204 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
205
206 eic->int_unmasked |= BIT(d->irq & 7);
207 ep93xx_gpio_update_int_params(epg, eic);
208}
209
210
211
212
213
214
215static int ep93xx_gpio_irq_type(struct irq_data *d, unsigned int type)
216{
217 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
218 struct ep93xx_gpio_irq_chip *eic = to_ep93xx_gpio_irq_chip(gc);
219 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
220 int offset = d->irq & 7;
221 int port_mask = BIT(offset);
222 irq_flow_handler_t handler;
223
224 gc->direction_input(gc, offset);
225
226 switch (type) {
227 case IRQ_TYPE_EDGE_RISING:
228 eic->int_type1 |= port_mask;
229 eic->int_type2 |= port_mask;
230 handler = handle_edge_irq;
231 break;
232 case IRQ_TYPE_EDGE_FALLING:
233 eic->int_type1 |= port_mask;
234 eic->int_type2 &= ~port_mask;
235 handler = handle_edge_irq;
236 break;
237 case IRQ_TYPE_LEVEL_HIGH:
238 eic->int_type1 &= ~port_mask;
239 eic->int_type2 |= port_mask;
240 handler = handle_level_irq;
241 break;
242 case IRQ_TYPE_LEVEL_LOW:
243 eic->int_type1 &= ~port_mask;
244 eic->int_type2 &= ~port_mask;
245 handler = handle_level_irq;
246 break;
247 case IRQ_TYPE_EDGE_BOTH:
248 eic->int_type1 |= port_mask;
249
250 if (gc->get(gc, offset))
251 eic->int_type2 &= ~port_mask;
252 else
253 eic->int_type2 |= port_mask;
254 handler = handle_edge_irq;
255 break;
256 default:
257 return -EINVAL;
258 }
259
260 irq_set_handler_locked(d, handler);
261
262 eic->int_enabled |= port_mask;
263
264 ep93xx_gpio_update_int_params(epg, eic);
265
266 return 0;
267}
268
269
270
271
272struct ep93xx_gpio_bank {
273 const char *label;
274 int data;
275 int dir;
276 int irq;
277 int base;
278 bool has_irq;
279 bool has_hierarchical_irq;
280 unsigned int irq_base;
281};
282
283#define EP93XX_GPIO_BANK(_label, _data, _dir, _irq, _base, _has_irq, _has_hier, _irq_base) \
284 { \
285 .label = _label, \
286 .data = _data, \
287 .dir = _dir, \
288 .irq = _irq, \
289 .base = _base, \
290 .has_irq = _has_irq, \
291 .has_hierarchical_irq = _has_hier, \
292 .irq_base = _irq_base, \
293 }
294
295static struct ep93xx_gpio_bank ep93xx_gpio_banks[] = {
296
297 EP93XX_GPIO_BANK("A", 0x00, 0x10, 0x90, 0, true, false, EP93XX_GPIO_A_IRQ_BASE),
298
299 EP93XX_GPIO_BANK("B", 0x04, 0x14, 0xac, 8, true, false, EP93XX_GPIO_B_IRQ_BASE),
300 EP93XX_GPIO_BANK("C", 0x08, 0x18, 0x00, 40, false, false, 0),
301 EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 0x00, 24, false, false, 0),
302 EP93XX_GPIO_BANK("E", 0x20, 0x24, 0x00, 32, false, false, 0),
303
304 EP93XX_GPIO_BANK("F", 0x30, 0x34, 0x4c, 16, false, true, EP93XX_GPIO_F_IRQ_BASE),
305 EP93XX_GPIO_BANK("G", 0x38, 0x3c, 0x00, 48, false, false, 0),
306 EP93XX_GPIO_BANK("H", 0x40, 0x44, 0x00, 56, false, false, 0),
307};
308
309static int ep93xx_gpio_set_config(struct gpio_chip *gc, unsigned offset,
310 unsigned long config)
311{
312 u32 debounce;
313
314 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
315 return -ENOTSUPP;
316
317 debounce = pinconf_to_config_argument(config);
318 ep93xx_gpio_int_debounce(gc, offset, debounce ? true : false);
319
320 return 0;
321}
322
323static void ep93xx_init_irq_chip(struct device *dev, struct irq_chip *ic)
324{
325 ic->irq_ack = ep93xx_gpio_irq_ack;
326 ic->irq_mask_ack = ep93xx_gpio_irq_mask_ack;
327 ic->irq_mask = ep93xx_gpio_irq_mask;
328 ic->irq_unmask = ep93xx_gpio_irq_unmask;
329 ic->irq_set_type = ep93xx_gpio_irq_type;
330}
331
332static int ep93xx_gpio_add_bank(struct ep93xx_gpio_chip *egc,
333 struct platform_device *pdev,
334 struct ep93xx_gpio *epg,
335 struct ep93xx_gpio_bank *bank)
336{
337 void __iomem *data = epg->base + bank->data;
338 void __iomem *dir = epg->base + bank->dir;
339 struct gpio_chip *gc = &egc->gc;
340 struct device *dev = &pdev->dev;
341 struct gpio_irq_chip *girq;
342 int err;
343
344 err = bgpio_init(gc, dev, 1, data, NULL, NULL, dir, NULL, 0);
345 if (err)
346 return err;
347
348 gc->label = bank->label;
349 gc->base = bank->base;
350
351 girq = &gc->irq;
352 if (bank->has_irq || bank->has_hierarchical_irq) {
353 struct irq_chip *ic;
354
355 gc->set_config = ep93xx_gpio_set_config;
356 egc->eic = devm_kcalloc(dev, 1,
357 sizeof(*egc->eic),
358 GFP_KERNEL);
359 if (!egc->eic)
360 return -ENOMEM;
361 egc->eic->irq_offset = bank->irq;
362 ic = &egc->eic->ic;
363 ic->name = devm_kasprintf(dev, GFP_KERNEL, "gpio-irq-%s", bank->label);
364 if (!ic->name)
365 return -ENOMEM;
366 ep93xx_init_irq_chip(dev, ic);
367 girq->chip = ic;
368 }
369
370 if (bank->has_irq) {
371 int ab_parent_irq = platform_get_irq(pdev, 0);
372
373 girq->parent_handler = ep93xx_gpio_ab_irq_handler;
374 girq->num_parents = 1;
375 girq->parents = devm_kcalloc(dev, girq->num_parents,
376 sizeof(*girq->parents),
377 GFP_KERNEL);
378 if (!girq->parents)
379 return -ENOMEM;
380 girq->default_type = IRQ_TYPE_NONE;
381 girq->handler = handle_level_irq;
382 girq->parents[0] = ab_parent_irq;
383 girq->first = bank->irq_base;
384 }
385
386
387 if (bank->has_hierarchical_irq) {
388 int gpio_irq;
389 int i;
390
391
392
393
394
395 girq->parent_handler = ep93xx_gpio_f_irq_handler;
396 girq->num_parents = 8;
397 girq->parents = devm_kcalloc(dev, girq->num_parents,
398 sizeof(*girq->parents),
399 GFP_KERNEL);
400 if (!girq->parents)
401 return -ENOMEM;
402
403 for (i = 0; i < girq->num_parents; i++) {
404 girq->parents[i] = platform_get_irq(pdev, i + 1);
405 gpio_irq = bank->irq_base + i;
406 irq_set_chip_data(gpio_irq, &epg->gc[5]);
407 irq_set_chip_and_handler(gpio_irq,
408 girq->chip,
409 handle_level_irq);
410 irq_clear_status_flags(gpio_irq, IRQ_NOREQUEST);
411 }
412 girq->default_type = IRQ_TYPE_NONE;
413 girq->handler = handle_level_irq;
414 girq->first = bank->irq_base;
415 }
416
417 return devm_gpiochip_add_data(dev, gc, epg);
418}
419
420static int ep93xx_gpio_probe(struct platform_device *pdev)
421{
422 struct ep93xx_gpio *epg;
423 int i;
424
425 epg = devm_kzalloc(&pdev->dev, sizeof(*epg), GFP_KERNEL);
426 if (!epg)
427 return -ENOMEM;
428
429 epg->base = devm_platform_ioremap_resource(pdev, 0);
430 if (IS_ERR(epg->base))
431 return PTR_ERR(epg->base);
432
433 for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++) {
434 struct ep93xx_gpio_chip *gc = &epg->gc[i];
435 struct ep93xx_gpio_bank *bank = &ep93xx_gpio_banks[i];
436
437 if (ep93xx_gpio_add_bank(gc, pdev, epg, bank))
438 dev_warn(&pdev->dev, "Unable to add gpio bank %s\n",
439 bank->label);
440 }
441
442 return 0;
443}
444
445static struct platform_driver ep93xx_gpio_driver = {
446 .driver = {
447 .name = "gpio-ep93xx",
448 },
449 .probe = ep93xx_gpio_probe,
450};
451
452static int __init ep93xx_gpio_init(void)
453{
454 return platform_driver_register(&ep93xx_gpio_driver);
455}
456postcore_initcall(ep93xx_gpio_init);
457
458MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com> "
459 "H Hartley Sweeten <hsweeten@visionengravers.com>");
460MODULE_DESCRIPTION("EP93XX GPIO driver");
461MODULE_LICENSE("GPL");
462
