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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Generic EP93xx GPIO handling
4 *
5 * Copyright (c) 2008 Ryan Mallon
6 * Copyright (c) 2011 H Hartley Sweeten <hsweeten@visionengravers.com>
7 *
8 * Based on code originally from:
9 * linux/arch/arm/mach-ep93xx/core.c
10 */
11
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/* Maximum value for gpio line identifiers */
26#define EP93XX_GPIO_LINE_MAX 63
27
28/* Maximum value for irq capable line identifiers */
29#define EP93XX_GPIO_LINE_MAX_IRQ 23
30
31/*
32 * Static mapping of GPIO bank F IRQS:
33 * F0..F7 (16..24) to irq 80..87.
34 */
35#define EP93XX_GPIO_F_IRQ_BASE 80
36
37struct ep93xx_gpio {
38 void __iomem *base;
39 struct gpio_chip gc[8];
40};
41
42/*************************************************************************
43 * Interrupt handling for EP93xx on-chip GPIOs
44 *************************************************************************/
45static unsigned char gpio_int_unmasked[3];
46static unsigned char gpio_int_enabled[3];
47static unsigned char gpio_int_type1[3];
48static unsigned char gpio_int_type2[3];
49static unsigned char gpio_int_debounce[3];
50
51/* Port ordering is: A B F */
52static const u8 int_type1_register_offset[3] = { 0x90, 0xac, 0x4c };
53static const u8 int_type2_register_offset[3] = { 0x94, 0xb0, 0x50 };
54static const u8 eoi_register_offset[3] = { 0x98, 0xb4, 0x54 };
55static const u8 int_en_register_offset[3] = { 0x9c, 0xb8, 0x58 };
56static const u8 int_debounce_register_offset[3] = { 0xa8, 0xc4, 0x64 };
57
58static void ep93xx_gpio_update_int_params(struct ep93xx_gpio *epg, unsigned port)
59{
60 BUG_ON(port > 2);
61
62 writeb_relaxed(0, epg->base + int_en_register_offset[port]);
63
64 writeb_relaxed(gpio_int_type2[port],
65 epg->base + int_type2_register_offset[port]);
66
67 writeb_relaxed(gpio_int_type1[port],
68 epg->base + int_type1_register_offset[port]);
69
70 writeb(gpio_int_unmasked[port] & gpio_int_enabled[port],
71 epg->base + int_en_register_offset[port]);
72}
73
74static int ep93xx_gpio_port(struct gpio_chip *gc)
75{
76 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
77 int port = 0;
78
79 while (port < ARRAY_SIZE(epg->gc) && gc != &epg->gc[port])
80 port++;
81
82 /* This should not happen but is there as a last safeguard */
83 if (port == ARRAY_SIZE(epg->gc)) {
84 pr_crit("can't find the GPIO port\n");
85 return 0;
86 }
87
88 return port;
89}
90
91static void ep93xx_gpio_int_debounce(struct gpio_chip *gc,
92 unsigned int offset, bool enable)
93{
94 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
95 int port = ep93xx_gpio_port(gc);
96 int port_mask = BIT(offset);
97
98 if (enable)
99 gpio_int_debounce[port] |= port_mask;
100 else
101 gpio_int_debounce[port] &= ~port_mask;
102
103 writeb(gpio_int_debounce[port],
104 epg->base + int_debounce_register_offset[port]);
105}
106
107static void ep93xx_gpio_ab_irq_handler(struct irq_desc *desc)
108{
109 struct gpio_chip *gc = irq_desc_get_handler_data(desc);
110 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
111 struct irq_chip *irqchip = irq_desc_get_chip(desc);
112 unsigned long stat;
113 int offset;
114
115 chained_irq_enter(irqchip, desc);
116
117 /*
118 * Dispatch the IRQs to the irqdomain of each A and B
119 * gpiochip irqdomains depending on what has fired.
120 * The tricky part is that the IRQ line is shared
121 * between bank A and B and each has their own gpiochip.
122 */
123 stat = readb(epg->base + EP93XX_GPIO_A_INT_STATUS);
124 for_each_set_bit(offset, &stat, 8)
125 generic_handle_irq(irq_find_mapping(epg->gc[0].irq.domain,
126 offset));
127
128 stat = readb(epg->base + EP93XX_GPIO_B_INT_STATUS);
129 for_each_set_bit(offset, &stat, 8)
130 generic_handle_irq(irq_find_mapping(epg->gc[1].irq.domain,
131 offset));
132
133 chained_irq_exit(irqchip, desc);
134}
135
136static void ep93xx_gpio_f_irq_handler(struct irq_desc *desc)
137{
138 /*
139 * map discontiguous hw irq range to continuous sw irq range:
140 *
141 * IRQ_EP93XX_GPIO{0..7}MUX -> EP93XX_GPIO_LINE_F{0..7}
142 */
143 struct irq_chip *irqchip = irq_desc_get_chip(desc);
144 unsigned int irq = irq_desc_get_irq(desc);
145 int port_f_idx = ((irq + 1) & 7) ^ 4; /* {19..22,47..50} -> {0..7} */
146 int gpio_irq = EP93XX_GPIO_F_IRQ_BASE + port_f_idx;
147
148 chained_irq_enter(irqchip, desc);
149 generic_handle_irq(gpio_irq);
150 chained_irq_exit(irqchip, desc);
151}
152
153static void ep93xx_gpio_irq_ack(struct irq_data *d)
154{
155 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
156 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
157 int port = ep93xx_gpio_port(gc);
158 int port_mask = BIT(d->irq & 7);
159
160 if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) {
161 gpio_int_type2[port] ^= port_mask; /* switch edge direction */
162 ep93xx_gpio_update_int_params(epg, port);
163 }
164
165 writeb(port_mask, epg->base + eoi_register_offset[port]);
166}
167
168static void ep93xx_gpio_irq_mask_ack(struct irq_data *d)
169{
170 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
171 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
172 int port = ep93xx_gpio_port(gc);
173 int port_mask = BIT(d->irq & 7);
174
175 if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH)
176 gpio_int_type2[port] ^= port_mask; /* switch edge direction */
177
178 gpio_int_unmasked[port] &= ~port_mask;
179 ep93xx_gpio_update_int_params(epg, port);
180
181 writeb(port_mask, epg->base + eoi_register_offset[port]);
182}
183
184static void ep93xx_gpio_irq_mask(struct irq_data *d)
185{
186 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
187 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
188 int port = ep93xx_gpio_port(gc);
189
190 gpio_int_unmasked[port] &= ~BIT(d->irq & 7);
191 ep93xx_gpio_update_int_params(epg, port);
192}
193
194static void ep93xx_gpio_irq_unmask(struct irq_data *d)
195{
196 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
197 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
198 int port = ep93xx_gpio_port(gc);
199
200 gpio_int_unmasked[port] |= BIT(d->irq & 7);
201 ep93xx_gpio_update_int_params(epg, port);
202}
203
204/*
205 * gpio_int_type1 controls whether the interrupt is level (0) or
206 * edge (1) triggered, while gpio_int_type2 controls whether it
207 * triggers on low/falling (0) or high/rising (1).
208 */
209static int ep93xx_gpio_irq_type(struct irq_data *d, unsigned int type)
210{
211 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
212 struct ep93xx_gpio *epg = gpiochip_get_data(gc);
213 int port = ep93xx_gpio_port(gc);
214 int offset = d->irq & 7;
215 int port_mask = BIT(offset);
216 irq_flow_handler_t handler;
217
218 gc->direction_input(gc, offset);
219
220 switch (type) {
221 case IRQ_TYPE_EDGE_RISING:
222 gpio_int_type1[port] |= port_mask;
223 gpio_int_type2[port] |= port_mask;
224 handler = handle_edge_irq;
225 break;
226 case IRQ_TYPE_EDGE_FALLING:
227 gpio_int_type1[port] |= port_mask;
228 gpio_int_type2[port] &= ~port_mask;
229 handler = handle_edge_irq;
230 break;
231 case IRQ_TYPE_LEVEL_HIGH:
232 gpio_int_type1[port] &= ~port_mask;
233 gpio_int_type2[port] |= port_mask;
234 handler = handle_level_irq;
235 break;
236 case IRQ_TYPE_LEVEL_LOW:
237 gpio_int_type1[port] &= ~port_mask;
238 gpio_int_type2[port] &= ~port_mask;
239 handler = handle_level_irq;
240 break;
241 case IRQ_TYPE_EDGE_BOTH:
242 gpio_int_type1[port] |= port_mask;
243 /* set initial polarity based on current input level */
244 if (gc->get(gc, offset))
245 gpio_int_type2[port] &= ~port_mask; /* falling */
246 else
247 gpio_int_type2[port] |= port_mask; /* rising */
248 handler = handle_edge_irq;
249 break;
250 default:
251 return -EINVAL;
252 }
253
254 irq_set_handler_locked(d, handler);
255
256 gpio_int_enabled[port] |= port_mask;
257
258 ep93xx_gpio_update_int_params(epg, port);
259
260 return 0;
261}
262
263static struct irq_chip ep93xx_gpio_irq_chip = {
264 .name = "GPIO",
265 .irq_ack = ep93xx_gpio_irq_ack,
266 .irq_mask_ack = ep93xx_gpio_irq_mask_ack,
267 .irq_mask = ep93xx_gpio_irq_mask,
268 .irq_unmask = ep93xx_gpio_irq_unmask,
269 .irq_set_type = ep93xx_gpio_irq_type,
270};
271
272static int ep93xx_gpio_init_irq(struct platform_device *pdev,
273 struct ep93xx_gpio *epg)
274{
275 int ab_parent_irq = platform_get_irq(pdev, 0);
276 struct device *dev = &pdev->dev;
277 int gpio_irq;
278 int ret;
279 int i;
280
281 /* The A bank */
282 ret = gpiochip_irqchip_add(&epg->gc[0], &ep93xx_gpio_irq_chip,
283 64, handle_level_irq,
284 IRQ_TYPE_NONE);
285 if (ret) {
286 dev_err(dev, "Could not add irqchip 0\n");
287 return ret;
288 }
289 gpiochip_set_chained_irqchip(&epg->gc[0], &ep93xx_gpio_irq_chip,
290 ab_parent_irq,
291 ep93xx_gpio_ab_irq_handler);
292
293 /* The B bank */
294 ret = gpiochip_irqchip_add(&epg->gc[1], &ep93xx_gpio_irq_chip,
295 72, handle_level_irq,
296 IRQ_TYPE_NONE);
297 if (ret) {
298 dev_err(dev, "Could not add irqchip 1\n");
299 return ret;
300 }
301 gpiochip_set_chained_irqchip(&epg->gc[1], &ep93xx_gpio_irq_chip,
302 ab_parent_irq,
303 ep93xx_gpio_ab_irq_handler);
304
305 /* The F bank */
306 for (i = 0; i < 8; i++) {
307 gpio_irq = EP93XX_GPIO_F_IRQ_BASE + i;
308 irq_set_chip_data(gpio_irq, &epg->gc[5]);
309 irq_set_chip_and_handler(gpio_irq, &ep93xx_gpio_irq_chip,
310 handle_level_irq);
311 irq_clear_status_flags(gpio_irq, IRQ_NOREQUEST);
312 }
313
314 for (i = 1; i <= 8; i++)
315 irq_set_chained_handler_and_data(platform_get_irq(pdev, i),
316 ep93xx_gpio_f_irq_handler,
317 &epg->gc[i]);
318 return 0;
319}
320
321
322/*************************************************************************
323 * gpiolib interface for EP93xx on-chip GPIOs
324 *************************************************************************/
325struct ep93xx_gpio_bank {
326 const char *label;
327 int data;
328 int dir;
329 int base;
330 bool has_irq;
331};
332
333#define EP93XX_GPIO_BANK(_label, _data, _dir, _base, _has_irq) \
334 { \
335 .label = _label, \
336 .data = _data, \
337 .dir = _dir, \
338 .base = _base, \
339 .has_irq = _has_irq, \
340 }
341
342static struct ep93xx_gpio_bank ep93xx_gpio_banks[] = {
343 EP93XX_GPIO_BANK("A", 0x00, 0x10, 0, true), /* Bank A has 8 IRQs */
344 EP93XX_GPIO_BANK("B", 0x04, 0x14, 8, true), /* Bank B has 8 IRQs */
345 EP93XX_GPIO_BANK("C", 0x08, 0x18, 40, false),
346 EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 24, false),
347 EP93XX_GPIO_BANK("E", 0x20, 0x24, 32, false),
348 EP93XX_GPIO_BANK("F", 0x30, 0x34, 16, true), /* Bank F has 8 IRQs */
349 EP93XX_GPIO_BANK("G", 0x38, 0x3c, 48, false),
350 EP93XX_GPIO_BANK("H", 0x40, 0x44, 56, false),
351};
352
353static int ep93xx_gpio_set_config(struct gpio_chip *gc, unsigned offset,
354 unsigned long config)
355{
356 u32 debounce;
357
358 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
359 return -ENOTSUPP;
360
361 debounce = pinconf_to_config_argument(config);
362 ep93xx_gpio_int_debounce(gc, offset, debounce ? true : false);
363
364 return 0;
365}
366
367static int ep93xx_gpio_f_to_irq(struct gpio_chip *gc, unsigned offset)
368{
369 return EP93XX_GPIO_F_IRQ_BASE + offset;
370}
371
372static int ep93xx_gpio_add_bank(struct gpio_chip *gc, struct device *dev,
373 struct ep93xx_gpio *epg,
374 struct ep93xx_gpio_bank *bank)
375{
376 void __iomem *data = epg->base + bank->data;
377 void __iomem *dir = epg->base + bank->dir;
378 int err;
379
380 err = bgpio_init(gc, dev, 1, data, NULL, NULL, dir, NULL, 0);
381 if (err)
382 return err;
383
384 gc->label = bank->label;
385 gc->base = bank->base;
386
387 if (bank->has_irq)
388 gc->set_config = ep93xx_gpio_set_config;
389
390 return devm_gpiochip_add_data(dev, gc, epg);
391}
392
393static int ep93xx_gpio_probe(struct platform_device *pdev)
394{
395 struct ep93xx_gpio *epg;
396 struct resource *res;
397 int i;
398 struct device *dev = &pdev->dev;
399
400 epg = devm_kzalloc(dev, sizeof(*epg), GFP_KERNEL);
401 if (!epg)
402 return -ENOMEM;
403
404 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
405 epg->base = devm_ioremap_resource(dev, res);
406 if (IS_ERR(epg->base))
407 return PTR_ERR(epg->base);
408
409 for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++) {
410 struct gpio_chip *gc = &epg->gc[i];
411 struct ep93xx_gpio_bank *bank = &ep93xx_gpio_banks[i];
412
413 if (ep93xx_gpio_add_bank(gc, &pdev->dev, epg, bank))
414 dev_warn(&pdev->dev, "Unable to add gpio bank %s\n",
415 bank->label);
416 /* Only bank F has especially funky IRQ handling */
417 if (i == 5)
418 gc->to_irq = ep93xx_gpio_f_to_irq;
419 }
420
421 ep93xx_gpio_init_irq(pdev, epg);
422
423 return 0;
424}
425
426static struct platform_driver ep93xx_gpio_driver = {
427 .driver = {
428 .name = "gpio-ep93xx",
429 },
430 .probe = ep93xx_gpio_probe,
431};
432
433static int __init ep93xx_gpio_init(void)
434{
435 return platform_driver_register(&ep93xx_gpio_driver);
436}
437postcore_initcall(ep93xx_gpio_init);
438
439MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com> "
440 "H Hartley Sweeten <hsweeten@visionengravers.com>");
441MODULE_DESCRIPTION("EP93XX GPIO driver");
442MODULE_LICENSE("GPL");
443

Warning: That file was not part of the compilation database. It may have many parsing errors.