1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Driver for STMicroelectronics Multi-Function eXpander (STMFX) GPIO expander
4 *
5 * Copyright (C) 2019 STMicroelectronics
6 * Author(s): Amelie Delaunay <amelie.delaunay@st.com>.
7 */
8 #include <linux/gpio/driver.h>
9 #include <linux/interrupt.h>
10 #include <linux/mfd/stmfx.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/seq_file.h>
14
15 #include <linux/pinctrl/pinconf.h>
16 #include <linux/pinctrl/pinmux.h>
17
18 #include "core.h"
19 #include "pinctrl-utils.h"
20
21 /* GPIOs expander */
22 /* GPIO_STATE1 0x10, GPIO_STATE2 0x11, GPIO_STATE3 0x12 */
23 #define STMFX_REG_GPIO_STATE STMFX_REG_GPIO_STATE1 /* R */
24 /* GPIO_DIR1 0x60, GPIO_DIR2 0x61, GPIO_DIR3 0x63 */
25 #define STMFX_REG_GPIO_DIR STMFX_REG_GPIO_DIR1 /* RW */
26 /* GPIO_TYPE1 0x64, GPIO_TYPE2 0x65, GPIO_TYPE3 0x66 */
27 #define STMFX_REG_GPIO_TYPE STMFX_REG_GPIO_TYPE1 /* RW */
28 /* GPIO_PUPD1 0x68, GPIO_PUPD2 0x69, GPIO_PUPD3 0x6A */
29 #define STMFX_REG_GPIO_PUPD STMFX_REG_GPIO_PUPD1 /* RW */
30 /* GPO_SET1 0x6C, GPO_SET2 0x6D, GPO_SET3 0x6E */
31 #define STMFX_REG_GPO_SET STMFX_REG_GPO_SET1 /* RW */
32 /* GPO_CLR1 0x70, GPO_CLR2 0x71, GPO_CLR3 0x72 */
33 #define STMFX_REG_GPO_CLR STMFX_REG_GPO_CLR1 /* RW */
34 /* IRQ_GPI_SRC1 0x48, IRQ_GPI_SRC2 0x49, IRQ_GPI_SRC3 0x4A */
35 #define STMFX_REG_IRQ_GPI_SRC STMFX_REG_IRQ_GPI_SRC1 /* RW */
36 /* IRQ_GPI_EVT1 0x4C, IRQ_GPI_EVT2 0x4D, IRQ_GPI_EVT3 0x4E */
37 #define STMFX_REG_IRQ_GPI_EVT STMFX_REG_IRQ_GPI_EVT1 /* RW */
38 /* IRQ_GPI_TYPE1 0x50, IRQ_GPI_TYPE2 0x51, IRQ_GPI_TYPE3 0x52 */
39 #define STMFX_REG_IRQ_GPI_TYPE STMFX_REG_IRQ_GPI_TYPE1 /* RW */
40 /* IRQ_GPI_PENDING1 0x0C, IRQ_GPI_PENDING2 0x0D, IRQ_GPI_PENDING3 0x0E*/
41 #define STMFX_REG_IRQ_GPI_PENDING STMFX_REG_IRQ_GPI_PENDING1 /* R */
42 /* IRQ_GPI_ACK1 0x54, IRQ_GPI_ACK2 0x55, IRQ_GPI_ACK3 0x56 */
43 #define STMFX_REG_IRQ_GPI_ACK STMFX_REG_IRQ_GPI_ACK1 /* RW */
44
45 #define NR_GPIO_REGS 3
46 #define NR_GPIOS_PER_REG 8
47 #define get_reg(offset) ((offset) / NR_GPIOS_PER_REG)
48 #define get_shift(offset) ((offset) % NR_GPIOS_PER_REG)
49 #define get_mask(offset) (BIT(get_shift(offset)))
50
51 /*
52 * STMFX pinctrl can have up to 24 pins if STMFX other functions are not used.
53 * Pins availability is managed thanks to gpio-ranges property.
54 */
55 static const struct pinctrl_pin_desc stmfx_pins[] = {
56 PINCTRL_PIN(0, "gpio0"),
57 PINCTRL_PIN(1, "gpio1"),
58 PINCTRL_PIN(2, "gpio2"),
59 PINCTRL_PIN(3, "gpio3"),
60 PINCTRL_PIN(4, "gpio4"),
61 PINCTRL_PIN(5, "gpio5"),
62 PINCTRL_PIN(6, "gpio6"),
63 PINCTRL_PIN(7, "gpio7"),
64 PINCTRL_PIN(8, "gpio8"),
65 PINCTRL_PIN(9, "gpio9"),
66 PINCTRL_PIN(10, "gpio10"),
67 PINCTRL_PIN(11, "gpio11"),
68 PINCTRL_PIN(12, "gpio12"),
69 PINCTRL_PIN(13, "gpio13"),
70 PINCTRL_PIN(14, "gpio14"),
71 PINCTRL_PIN(15, "gpio15"),
72 PINCTRL_PIN(16, "agpio0"),
73 PINCTRL_PIN(17, "agpio1"),
74 PINCTRL_PIN(18, "agpio2"),
75 PINCTRL_PIN(19, "agpio3"),
76 PINCTRL_PIN(20, "agpio4"),
77 PINCTRL_PIN(21, "agpio5"),
78 PINCTRL_PIN(22, "agpio6"),
79 PINCTRL_PIN(23, "agpio7"),
80 };
81
82 struct stmfx_pinctrl {
83 struct device *dev;
84 struct stmfx *stmfx;
85 struct pinctrl_dev *pctl_dev;
86 struct pinctrl_desc pctl_desc;
87 struct gpio_chip gpio_chip;
88 struct mutex lock; /* IRQ bus lock */
89 unsigned long gpio_valid_mask;
90 /* Cache of IRQ_GPI_* registers for bus_lock */
91 u8 irq_gpi_src[NR_GPIO_REGS];
92 u8 irq_gpi_type[NR_GPIO_REGS];
93 u8 irq_gpi_evt[NR_GPIO_REGS];
94 u8 irq_toggle_edge[NR_GPIO_REGS];
95 #ifdef CONFIG_PM
96 /* Backup of GPIO_* registers for suspend/resume */
97 u8 bkp_gpio_state[NR_GPIO_REGS];
98 u8 bkp_gpio_dir[NR_GPIO_REGS];
99 u8 bkp_gpio_type[NR_GPIO_REGS];
100 u8 bkp_gpio_pupd[NR_GPIO_REGS];
101 #endif
102 };
103
stmfx_gpio_get(struct gpio_chip * gc,unsigned int offset)104 static int stmfx_gpio_get(struct gpio_chip *gc, unsigned int offset)
105 {
106 struct stmfx_pinctrl *pctl = gpiochip_get_data(gc);
107 u32 reg = STMFX_REG_GPIO_STATE + get_reg(offset);
108 u32 mask = get_mask(offset);
109 u32 value;
110 int ret;
111
112 ret = regmap_read(pctl->stmfx->map, reg, &value);
113
114 return ret ? ret : !!(value & mask);
115 }
116
stmfx_gpio_set(struct gpio_chip * gc,unsigned int offset,int value)117 static void stmfx_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
118 {
119 struct stmfx_pinctrl *pctl = gpiochip_get_data(gc);
120 u32 reg = value ? STMFX_REG_GPO_SET : STMFX_REG_GPO_CLR;
121 u32 mask = get_mask(offset);
122
123 regmap_write_bits(pctl->stmfx->map, reg + get_reg(offset),
124 mask, mask);
125 }
126
stmfx_gpio_get_direction(struct gpio_chip * gc,unsigned int offset)127 static int stmfx_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
128 {
129 struct stmfx_pinctrl *pctl = gpiochip_get_data(gc);
130 u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
131 u32 mask = get_mask(offset);
132 u32 val;
133 int ret;
134
135 ret = regmap_read(pctl->stmfx->map, reg, &val);
136 /*
137 * On stmfx, gpio pins direction is (0)input, (1)output.
138 */
139 if (ret)
140 return ret;
141
142 if (val & mask)
143 return GPIO_LINE_DIRECTION_OUT;
144
145 return GPIO_LINE_DIRECTION_IN;
146 }
147
stmfx_gpio_direction_input(struct gpio_chip * gc,unsigned int offset)148 static int stmfx_gpio_direction_input(struct gpio_chip *gc, unsigned int offset)
149 {
150 struct stmfx_pinctrl *pctl = gpiochip_get_data(gc);
151 u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
152 u32 mask = get_mask(offset);
153
154 return regmap_write_bits(pctl->stmfx->map, reg, mask, 0);
155 }
156
stmfx_gpio_direction_output(struct gpio_chip * gc,unsigned int offset,int value)157 static int stmfx_gpio_direction_output(struct gpio_chip *gc,
158 unsigned int offset, int value)
159 {
160 struct stmfx_pinctrl *pctl = gpiochip_get_data(gc);
161 u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
162 u32 mask = get_mask(offset);
163
164 stmfx_gpio_set(gc, offset, value);
165
166 return regmap_write_bits(pctl->stmfx->map, reg, mask, mask);
167 }
168
stmfx_pinconf_get_pupd(struct stmfx_pinctrl * pctl,unsigned int offset)169 static int stmfx_pinconf_get_pupd(struct stmfx_pinctrl *pctl,
170 unsigned int offset)
171 {
172 u32 reg = STMFX_REG_GPIO_PUPD + get_reg(offset);
173 u32 pupd, mask = get_mask(offset);
174 int ret;
175
176 ret = regmap_read(pctl->stmfx->map, reg, &pupd);
177 if (ret)
178 return ret;
179
180 return !!(pupd & mask);
181 }
182
stmfx_pinconf_set_pupd(struct stmfx_pinctrl * pctl,unsigned int offset,u32 pupd)183 static int stmfx_pinconf_set_pupd(struct stmfx_pinctrl *pctl,
184 unsigned int offset, u32 pupd)
185 {
186 u32 reg = STMFX_REG_GPIO_PUPD + get_reg(offset);
187 u32 mask = get_mask(offset);
188
189 return regmap_write_bits(pctl->stmfx->map, reg, mask, pupd ? mask : 0);
190 }
191
stmfx_pinconf_get_type(struct stmfx_pinctrl * pctl,unsigned int offset)192 static int stmfx_pinconf_get_type(struct stmfx_pinctrl *pctl,
193 unsigned int offset)
194 {
195 u32 reg = STMFX_REG_GPIO_TYPE + get_reg(offset);
196 u32 type, mask = get_mask(offset);
197 int ret;
198
199 ret = regmap_read(pctl->stmfx->map, reg, &type);
200 if (ret)
201 return ret;
202
203 return !!(type & mask);
204 }
205
stmfx_pinconf_set_type(struct stmfx_pinctrl * pctl,unsigned int offset,u32 type)206 static int stmfx_pinconf_set_type(struct stmfx_pinctrl *pctl,
207 unsigned int offset, u32 type)
208 {
209 u32 reg = STMFX_REG_GPIO_TYPE + get_reg(offset);
210 u32 mask = get_mask(offset);
211
212 return regmap_write_bits(pctl->stmfx->map, reg, mask, type ? mask : 0);
213 }
214
stmfx_pinconf_get(struct pinctrl_dev * pctldev,unsigned int pin,unsigned long * config)215 static int stmfx_pinconf_get(struct pinctrl_dev *pctldev,
216 unsigned int pin, unsigned long *config)
217 {
218 struct stmfx_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
219 u32 param = pinconf_to_config_param(*config);
220 struct pinctrl_gpio_range *range;
221 u32 arg = 0;
222 int ret, dir, type, pupd;
223
224 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
225 if (!range)
226 return -EINVAL;
227
228 dir = stmfx_gpio_get_direction(&pctl->gpio_chip, pin);
229 if (dir < 0)
230 return dir;
231
232 /*
233 * Currently the gpiolib IN is 1 and OUT is 0 but let's not count
234 * on it just to be on the safe side also in the future :)
235 */
236 dir = (dir == GPIO_LINE_DIRECTION_IN) ? 1 : 0;
237
238 type = stmfx_pinconf_get_type(pctl, pin);
239 if (type < 0)
240 return type;
241 pupd = stmfx_pinconf_get_pupd(pctl, pin);
242 if (pupd < 0)
243 return pupd;
244
245 switch (param) {
246 case PIN_CONFIG_BIAS_DISABLE:
247 if ((!dir && (!type || !pupd)) || (dir && !type))
248 arg = 1;
249 break;
250 case PIN_CONFIG_BIAS_PULL_DOWN:
251 if (dir && type && !pupd)
252 arg = 1;
253 break;
254 case PIN_CONFIG_BIAS_PULL_UP:
255 if (type && pupd)
256 arg = 1;
257 break;
258 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
259 if ((!dir && type) || (dir && !type))
260 arg = 1;
261 break;
262 case PIN_CONFIG_DRIVE_PUSH_PULL:
263 if ((!dir && !type) || (dir && type))
264 arg = 1;
265 break;
266 case PIN_CONFIG_OUTPUT:
267 if (dir)
268 return -EINVAL;
269
270 ret = stmfx_gpio_get(&pctl->gpio_chip, pin);
271 if (ret < 0)
272 return ret;
273
274 arg = ret;
275 break;
276 default:
277 return -ENOTSUPP;
278 }
279
280 *config = pinconf_to_config_packed(param, arg);
281
282 return 0;
283 }
284
stmfx_pinconf_set(struct pinctrl_dev * pctldev,unsigned int pin,unsigned long * configs,unsigned int num_configs)285 static int stmfx_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
286 unsigned long *configs, unsigned int num_configs)
287 {
288 struct stmfx_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
289 struct pinctrl_gpio_range *range;
290 enum pin_config_param param;
291 u32 arg;
292 int i, ret;
293
294 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
295 if (!range) {
296 dev_err(pctldev->dev, "pin %d is not available\n", pin);
297 return -EINVAL;
298 }
299
300 for (i = 0; i < num_configs; i++) {
301 param = pinconf_to_config_param(configs[i]);
302 arg = pinconf_to_config_argument(configs[i]);
303
304 switch (param) {
305 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
306 case PIN_CONFIG_BIAS_DISABLE:
307 case PIN_CONFIG_DRIVE_PUSH_PULL:
308 ret = stmfx_pinconf_set_type(pctl, pin, 0);
309 if (ret)
310 return ret;
311 break;
312 case PIN_CONFIG_BIAS_PULL_DOWN:
313 ret = stmfx_pinconf_set_type(pctl, pin, 1);
314 if (ret)
315 return ret;
316 ret = stmfx_pinconf_set_pupd(pctl, pin, 0);
317 if (ret)
318 return ret;
319 break;
320 case PIN_CONFIG_BIAS_PULL_UP:
321 ret = stmfx_pinconf_set_type(pctl, pin, 1);
322 if (ret)
323 return ret;
324 ret = stmfx_pinconf_set_pupd(pctl, pin, 1);
325 if (ret)
326 return ret;
327 break;
328 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
329 ret = stmfx_pinconf_set_type(pctl, pin, 1);
330 if (ret)
331 return ret;
332 break;
333 case PIN_CONFIG_OUTPUT:
334 ret = stmfx_gpio_direction_output(&pctl->gpio_chip,
335 pin, arg);
336 if (ret)
337 return ret;
338 break;
339 default:
340 return -ENOTSUPP;
341 }
342 }
343
344 return 0;
345 }
346
stmfx_pinconf_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned int offset)347 static void stmfx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
348 struct seq_file *s, unsigned int offset)
349 {
350 struct stmfx_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
351 struct pinctrl_gpio_range *range;
352 int dir, type, pupd, val;
353
354 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, offset);
355 if (!range)
356 return;
357
358 dir = stmfx_gpio_get_direction(&pctl->gpio_chip, offset);
359 if (dir < 0)
360 return;
361 type = stmfx_pinconf_get_type(pctl, offset);
362 if (type < 0)
363 return;
364 pupd = stmfx_pinconf_get_pupd(pctl, offset);
365 if (pupd < 0)
366 return;
367 val = stmfx_gpio_get(&pctl->gpio_chip, offset);
368 if (val < 0)
369 return;
370
371 if (dir == GPIO_LINE_DIRECTION_OUT) {
372 seq_printf(s, "output %s ", val ? "high" : "low");
373 if (type)
374 seq_printf(s, "open drain %s internal pull-up ",
375 pupd ? "with" : "without");
376 else
377 seq_puts(s, "push pull no pull ");
378 } else {
379 seq_printf(s, "input %s ", val ? "high" : "low");
380 if (type)
381 seq_printf(s, "with internal pull-%s ",
382 pupd ? "up" : "down");
383 else
384 seq_printf(s, "%s ", pupd ? "floating" : "analog");
385 }
386 }
387
388 static const struct pinconf_ops stmfx_pinconf_ops = {
389 .pin_config_get = stmfx_pinconf_get,
390 .pin_config_set = stmfx_pinconf_set,
391 .pin_config_dbg_show = stmfx_pinconf_dbg_show,
392 };
393
stmfx_pinctrl_get_groups_count(struct pinctrl_dev * pctldev)394 static int stmfx_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
395 {
396 return 0;
397 }
398
stmfx_pinctrl_get_group_name(struct pinctrl_dev * pctldev,unsigned int selector)399 static const char *stmfx_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
400 unsigned int selector)
401 {
402 return NULL;
403 }
404
stmfx_pinctrl_get_group_pins(struct pinctrl_dev * pctldev,unsigned int selector,const unsigned int ** pins,unsigned int * num_pins)405 static int stmfx_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
406 unsigned int selector,
407 const unsigned int **pins,
408 unsigned int *num_pins)
409 {
410 return -ENOTSUPP;
411 }
412
413 static const struct pinctrl_ops stmfx_pinctrl_ops = {
414 .get_groups_count = stmfx_pinctrl_get_groups_count,
415 .get_group_name = stmfx_pinctrl_get_group_name,
416 .get_group_pins = stmfx_pinctrl_get_group_pins,
417 .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
418 .dt_free_map = pinctrl_utils_free_map,
419 };
420
stmfx_pinctrl_irq_mask(struct irq_data * data)421 static void stmfx_pinctrl_irq_mask(struct irq_data *data)
422 {
423 struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
424 struct stmfx_pinctrl *pctl = gpiochip_get_data(gpio_chip);
425 u32 reg = get_reg(data->hwirq);
426 u32 mask = get_mask(data->hwirq);
427
428 pctl->irq_gpi_src[reg] &= ~mask;
429 gpiochip_disable_irq(gpio_chip, irqd_to_hwirq(data));
430 }
431
stmfx_pinctrl_irq_unmask(struct irq_data * data)432 static void stmfx_pinctrl_irq_unmask(struct irq_data *data)
433 {
434 struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
435 struct stmfx_pinctrl *pctl = gpiochip_get_data(gpio_chip);
436 u32 reg = get_reg(data->hwirq);
437 u32 mask = get_mask(data->hwirq);
438
439 gpiochip_enable_irq(gpio_chip, irqd_to_hwirq(data));
440 pctl->irq_gpi_src[reg] |= mask;
441 }
442
stmfx_pinctrl_irq_set_type(struct irq_data * data,unsigned int type)443 static int stmfx_pinctrl_irq_set_type(struct irq_data *data, unsigned int type)
444 {
445 struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
446 struct stmfx_pinctrl *pctl = gpiochip_get_data(gpio_chip);
447 u32 reg = get_reg(data->hwirq);
448 u32 mask = get_mask(data->hwirq);
449
450 if (type == IRQ_TYPE_NONE)
451 return -EINVAL;
452
453 if (type & IRQ_TYPE_EDGE_BOTH) {
454 pctl->irq_gpi_evt[reg] |= mask;
455 irq_set_handler_locked(data, handle_edge_irq);
456 } else {
457 pctl->irq_gpi_evt[reg] &= ~mask;
458 irq_set_handler_locked(data, handle_level_irq);
459 }
460
461 if ((type & IRQ_TYPE_EDGE_RISING) || (type & IRQ_TYPE_LEVEL_HIGH))
462 pctl->irq_gpi_type[reg] |= mask;
463 else
464 pctl->irq_gpi_type[reg] &= ~mask;
465
466 /*
467 * In case of (type & IRQ_TYPE_EDGE_BOTH), we need to know current
468 * GPIO value to set the right edge trigger. But in atomic context
469 * here we can't access registers over I2C. That's why (type &
470 * IRQ_TYPE_EDGE_BOTH) will be managed in .irq_sync_unlock.
471 */
472
473 if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH)
474 pctl->irq_toggle_edge[reg] |= mask;
475 else
476 pctl->irq_toggle_edge[reg] &= mask;
477
478 return 0;
479 }
480
stmfx_pinctrl_irq_bus_lock(struct irq_data * data)481 static void stmfx_pinctrl_irq_bus_lock(struct irq_data *data)
482 {
483 struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
484 struct stmfx_pinctrl *pctl = gpiochip_get_data(gpio_chip);
485
486 mutex_lock(&pctl->lock);
487 }
488
stmfx_pinctrl_irq_bus_sync_unlock(struct irq_data * data)489 static void stmfx_pinctrl_irq_bus_sync_unlock(struct irq_data *data)
490 {
491 struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
492 struct stmfx_pinctrl *pctl = gpiochip_get_data(gpio_chip);
493 u32 reg = get_reg(data->hwirq);
494 u32 mask = get_mask(data->hwirq);
495
496 /*
497 * In case of IRQ_TYPE_EDGE_BOTH), read the current GPIO value
498 * (this couldn't be done in .irq_set_type because of atomic context)
499 * to set the right irq trigger type.
500 */
501 if (pctl->irq_toggle_edge[reg] & mask) {
502 if (stmfx_gpio_get(gpio_chip, data->hwirq))
503 pctl->irq_gpi_type[reg] &= ~mask;
504 else
505 pctl->irq_gpi_type[reg] |= mask;
506 }
507
508 regmap_bulk_write(pctl->stmfx->map, STMFX_REG_IRQ_GPI_EVT,
509 pctl->irq_gpi_evt, NR_GPIO_REGS);
510 regmap_bulk_write(pctl->stmfx->map, STMFX_REG_IRQ_GPI_TYPE,
511 pctl->irq_gpi_type, NR_GPIO_REGS);
512 regmap_bulk_write(pctl->stmfx->map, STMFX_REG_IRQ_GPI_SRC,
513 pctl->irq_gpi_src, NR_GPIO_REGS);
514
515 mutex_unlock(&pctl->lock);
516 }
517
stmfx_gpio_irq_request_resources(struct irq_data * data)518 static int stmfx_gpio_irq_request_resources(struct irq_data *data)
519 {
520 struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
521 int ret;
522
523 ret = stmfx_gpio_direction_input(gpio_chip, data->hwirq);
524 if (ret)
525 return ret;
526
527 return gpiochip_reqres_irq(gpio_chip, data->hwirq);
528 }
529
stmfx_gpio_irq_release_resources(struct irq_data * data)530 static void stmfx_gpio_irq_release_resources(struct irq_data *data)
531 {
532 struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(data);
533
534 return gpiochip_relres_irq(gpio_chip, data->hwirq);
535 }
536
stmfx_pinctrl_irq_toggle_trigger(struct stmfx_pinctrl * pctl,unsigned int offset)537 static void stmfx_pinctrl_irq_toggle_trigger(struct stmfx_pinctrl *pctl,
538 unsigned int offset)
539 {
540 u32 reg = get_reg(offset);
541 u32 mask = get_mask(offset);
542 int val;
543
544 if (!(pctl->irq_toggle_edge[reg] & mask))
545 return;
546
547 val = stmfx_gpio_get(&pctl->gpio_chip, offset);
548 if (val < 0)
549 return;
550
551 if (val) {
552 pctl->irq_gpi_type[reg] &= mask;
553 regmap_write_bits(pctl->stmfx->map,
554 STMFX_REG_IRQ_GPI_TYPE + reg,
555 mask, 0);
556
557 } else {
558 pctl->irq_gpi_type[reg] |= mask;
559 regmap_write_bits(pctl->stmfx->map,
560 STMFX_REG_IRQ_GPI_TYPE + reg,
561 mask, mask);
562 }
563 }
564
stmfx_pinctrl_irq_thread_fn(int irq,void * dev_id)565 static irqreturn_t stmfx_pinctrl_irq_thread_fn(int irq, void *dev_id)
566 {
567 struct stmfx_pinctrl *pctl = (struct stmfx_pinctrl *)dev_id;
568 struct gpio_chip *gc = &pctl->gpio_chip;
569 u8 pending[NR_GPIO_REGS];
570 u8 src[NR_GPIO_REGS] = {0, 0, 0};
571 unsigned long n, status;
572 int i, ret;
573
574 ret = regmap_bulk_read(pctl->stmfx->map, STMFX_REG_IRQ_GPI_PENDING,
575 &pending, NR_GPIO_REGS);
576 if (ret)
577 return IRQ_NONE;
578
579 regmap_bulk_write(pctl->stmfx->map, STMFX_REG_IRQ_GPI_SRC,
580 src, NR_GPIO_REGS);
581
582 BUILD_BUG_ON(NR_GPIO_REGS > sizeof(status));
583 for (i = 0, status = 0; i < NR_GPIO_REGS; i++)
584 status |= (unsigned long)pending[i] << (i * 8);
585 for_each_set_bit(n, &status, gc->ngpio) {
586 handle_nested_irq(irq_find_mapping(gc->irq.domain, n));
587 stmfx_pinctrl_irq_toggle_trigger(pctl, n);
588 }
589
590 regmap_bulk_write(pctl->stmfx->map, STMFX_REG_IRQ_GPI_SRC,
591 pctl->irq_gpi_src, NR_GPIO_REGS);
592
593 return IRQ_HANDLED;
594 }
595
stmfx_pinctrl_irq_print_chip(struct irq_data * d,struct seq_file * p)596 static void stmfx_pinctrl_irq_print_chip(struct irq_data *d, struct seq_file *p)
597 {
598 struct gpio_chip *gpio_chip = irq_data_get_irq_chip_data(d);
599 struct stmfx_pinctrl *pctl = gpiochip_get_data(gpio_chip);
600
601 seq_printf(p, dev_name(pctl->dev));
602 }
603
604 static const struct irq_chip stmfx_pinctrl_irq_chip = {
605 .irq_mask = stmfx_pinctrl_irq_mask,
606 .irq_unmask = stmfx_pinctrl_irq_unmask,
607 .irq_set_type = stmfx_pinctrl_irq_set_type,
608 .irq_bus_lock = stmfx_pinctrl_irq_bus_lock,
609 .irq_bus_sync_unlock = stmfx_pinctrl_irq_bus_sync_unlock,
610 .irq_request_resources = stmfx_gpio_irq_request_resources,
611 .irq_release_resources = stmfx_gpio_irq_release_resources,
612 .irq_print_chip = stmfx_pinctrl_irq_print_chip,
613 .flags = IRQCHIP_IMMUTABLE,
614 };
615
stmfx_pinctrl_gpio_function_enable(struct stmfx_pinctrl * pctl)616 static int stmfx_pinctrl_gpio_function_enable(struct stmfx_pinctrl *pctl)
617 {
618 struct pinctrl_gpio_range *gpio_range;
619 struct pinctrl_dev *pctl_dev = pctl->pctl_dev;
620 u32 func = STMFX_FUNC_GPIO;
621
622 pctl->gpio_valid_mask = GENMASK(15, 0);
623
624 gpio_range = pinctrl_find_gpio_range_from_pin(pctl_dev, 16);
625 if (gpio_range) {
626 func |= STMFX_FUNC_ALTGPIO_LOW;
627 pctl->gpio_valid_mask |= GENMASK(19, 16);
628 }
629
630 gpio_range = pinctrl_find_gpio_range_from_pin(pctl_dev, 20);
631 if (gpio_range) {
632 func |= STMFX_FUNC_ALTGPIO_HIGH;
633 pctl->gpio_valid_mask |= GENMASK(23, 20);
634 }
635
636 return stmfx_function_enable(pctl->stmfx, func);
637 }
638
stmfx_pinctrl_probe(struct platform_device * pdev)639 static int stmfx_pinctrl_probe(struct platform_device *pdev)
640 {
641 struct stmfx *stmfx = dev_get_drvdata(pdev->dev.parent);
642 struct device_node *np = pdev->dev.of_node;
643 struct stmfx_pinctrl *pctl;
644 struct gpio_irq_chip *girq;
645 int irq, ret;
646
647 pctl = devm_kzalloc(stmfx->dev, sizeof(*pctl), GFP_KERNEL);
648 if (!pctl)
649 return -ENOMEM;
650
651 platform_set_drvdata(pdev, pctl);
652
653 pctl->dev = &pdev->dev;
654 pctl->stmfx = stmfx;
655
656 if (!of_property_present(np, "gpio-ranges")) {
657 dev_err(pctl->dev, "missing required gpio-ranges property\n");
658 return -EINVAL;
659 }
660
661 irq = platform_get_irq(pdev, 0);
662 if (irq < 0)
663 return irq;
664
665 mutex_init(&pctl->lock);
666
667 /* Register pin controller */
668 pctl->pctl_desc.name = "stmfx-pinctrl";
669 pctl->pctl_desc.pctlops = &stmfx_pinctrl_ops;
670 pctl->pctl_desc.confops = &stmfx_pinconf_ops;
671 pctl->pctl_desc.pins = stmfx_pins;
672 pctl->pctl_desc.npins = ARRAY_SIZE(stmfx_pins);
673 pctl->pctl_desc.owner = THIS_MODULE;
674 pctl->pctl_desc.link_consumers = true;
675
676 ret = devm_pinctrl_register_and_init(pctl->dev, &pctl->pctl_desc,
677 pctl, &pctl->pctl_dev);
678 if (ret) {
679 dev_err(pctl->dev, "pinctrl registration failed\n");
680 return ret;
681 }
682
683 ret = pinctrl_enable(pctl->pctl_dev);
684 if (ret) {
685 dev_err(pctl->dev, "pinctrl enable failed\n");
686 return ret;
687 }
688
689 /* Register gpio controller */
690 pctl->gpio_chip.label = "stmfx-gpio";
691 pctl->gpio_chip.parent = pctl->dev;
692 pctl->gpio_chip.get_direction = stmfx_gpio_get_direction;
693 pctl->gpio_chip.direction_input = stmfx_gpio_direction_input;
694 pctl->gpio_chip.direction_output = stmfx_gpio_direction_output;
695 pctl->gpio_chip.get = stmfx_gpio_get;
696 pctl->gpio_chip.set = stmfx_gpio_set;
697 pctl->gpio_chip.set_config = gpiochip_generic_config;
698 pctl->gpio_chip.base = -1;
699 pctl->gpio_chip.ngpio = pctl->pctl_desc.npins;
700 pctl->gpio_chip.can_sleep = true;
701
702 girq = &pctl->gpio_chip.irq;
703 gpio_irq_chip_set_chip(girq, &stmfx_pinctrl_irq_chip);
704 /* This will let us handle the parent IRQ in the driver */
705 girq->parent_handler = NULL;
706 girq->num_parents = 0;
707 girq->parents = NULL;
708 girq->default_type = IRQ_TYPE_NONE;
709 girq->handler = handle_bad_irq;
710 girq->threaded = true;
711
712 ret = devm_gpiochip_add_data(pctl->dev, &pctl->gpio_chip, pctl);
713 if (ret) {
714 dev_err(pctl->dev, "gpio_chip registration failed\n");
715 return ret;
716 }
717
718 ret = stmfx_pinctrl_gpio_function_enable(pctl);
719 if (ret)
720 return ret;
721
722 ret = devm_request_threaded_irq(pctl->dev, irq, NULL,
723 stmfx_pinctrl_irq_thread_fn,
724 IRQF_ONESHOT,
725 dev_name(pctl->dev), pctl);
726 if (ret) {
727 dev_err(pctl->dev, "cannot request irq%d\n", irq);
728 return ret;
729 }
730
731 dev_info(pctl->dev,
732 "%ld GPIOs available\n", hweight_long(pctl->gpio_valid_mask));
733
734 return 0;
735 }
736
stmfx_pinctrl_remove(struct platform_device * pdev)737 static int stmfx_pinctrl_remove(struct platform_device *pdev)
738 {
739 struct stmfx *stmfx = dev_get_drvdata(pdev->dev.parent);
740
741 return stmfx_function_disable(stmfx,
742 STMFX_FUNC_GPIO |
743 STMFX_FUNC_ALTGPIO_LOW |
744 STMFX_FUNC_ALTGPIO_HIGH);
745 }
746
747 #ifdef CONFIG_PM_SLEEP
stmfx_pinctrl_backup_regs(struct stmfx_pinctrl * pctl)748 static int stmfx_pinctrl_backup_regs(struct stmfx_pinctrl *pctl)
749 {
750 int ret;
751
752 ret = regmap_bulk_read(pctl->stmfx->map, STMFX_REG_GPIO_STATE,
753 &pctl->bkp_gpio_state, NR_GPIO_REGS);
754 if (ret)
755 return ret;
756 ret = regmap_bulk_read(pctl->stmfx->map, STMFX_REG_GPIO_DIR,
757 &pctl->bkp_gpio_dir, NR_GPIO_REGS);
758 if (ret)
759 return ret;
760 ret = regmap_bulk_read(pctl->stmfx->map, STMFX_REG_GPIO_TYPE,
761 &pctl->bkp_gpio_type, NR_GPIO_REGS);
762 if (ret)
763 return ret;
764 ret = regmap_bulk_read(pctl->stmfx->map, STMFX_REG_GPIO_PUPD,
765 &pctl->bkp_gpio_pupd, NR_GPIO_REGS);
766 if (ret)
767 return ret;
768
769 return 0;
770 }
771
stmfx_pinctrl_restore_regs(struct stmfx_pinctrl * pctl)772 static int stmfx_pinctrl_restore_regs(struct stmfx_pinctrl *pctl)
773 {
774 int ret;
775
776 ret = regmap_bulk_write(pctl->stmfx->map, STMFX_REG_GPIO_DIR,
777 pctl->bkp_gpio_dir, NR_GPIO_REGS);
778 if (ret)
779 return ret;
780 ret = regmap_bulk_write(pctl->stmfx->map, STMFX_REG_GPIO_TYPE,
781 pctl->bkp_gpio_type, NR_GPIO_REGS);
782 if (ret)
783 return ret;
784 ret = regmap_bulk_write(pctl->stmfx->map, STMFX_REG_GPIO_PUPD,
785 pctl->bkp_gpio_pupd, NR_GPIO_REGS);
786 if (ret)
787 return ret;
788 ret = regmap_bulk_write(pctl->stmfx->map, STMFX_REG_GPO_SET,
789 pctl->bkp_gpio_state, NR_GPIO_REGS);
790 if (ret)
791 return ret;
792 ret = regmap_bulk_write(pctl->stmfx->map, STMFX_REG_IRQ_GPI_EVT,
793 pctl->irq_gpi_evt, NR_GPIO_REGS);
794 if (ret)
795 return ret;
796 ret = regmap_bulk_write(pctl->stmfx->map, STMFX_REG_IRQ_GPI_TYPE,
797 pctl->irq_gpi_type, NR_GPIO_REGS);
798 if (ret)
799 return ret;
800 ret = regmap_bulk_write(pctl->stmfx->map, STMFX_REG_IRQ_GPI_SRC,
801 pctl->irq_gpi_src, NR_GPIO_REGS);
802 if (ret)
803 return ret;
804
805 return 0;
806 }
807
stmfx_pinctrl_suspend(struct device * dev)808 static int stmfx_pinctrl_suspend(struct device *dev)
809 {
810 struct stmfx_pinctrl *pctl = dev_get_drvdata(dev);
811 int ret;
812
813 ret = stmfx_pinctrl_backup_regs(pctl);
814 if (ret) {
815 dev_err(pctl->dev, "registers backup failure\n");
816 return ret;
817 }
818
819 return 0;
820 }
821
stmfx_pinctrl_resume(struct device * dev)822 static int stmfx_pinctrl_resume(struct device *dev)
823 {
824 struct stmfx_pinctrl *pctl = dev_get_drvdata(dev);
825 int ret;
826
827 ret = stmfx_pinctrl_restore_regs(pctl);
828 if (ret) {
829 dev_err(pctl->dev, "registers restoration failure\n");
830 return ret;
831 }
832
833 return 0;
834 }
835 #endif
836
837 static SIMPLE_DEV_PM_OPS(stmfx_pinctrl_dev_pm_ops,
838 stmfx_pinctrl_suspend, stmfx_pinctrl_resume);
839
840 static const struct of_device_id stmfx_pinctrl_of_match[] = {
841 { .compatible = "st,stmfx-0300-pinctrl", },
842 {},
843 };
844 MODULE_DEVICE_TABLE(of, stmfx_pinctrl_of_match);
845
846 static struct platform_driver stmfx_pinctrl_driver = {
847 .driver = {
848 .name = "stmfx-pinctrl",
849 .of_match_table = stmfx_pinctrl_of_match,
850 .pm = &stmfx_pinctrl_dev_pm_ops,
851 },
852 .probe = stmfx_pinctrl_probe,
853 .remove = stmfx_pinctrl_remove,
854 };
855 module_platform_driver(stmfx_pinctrl_driver);
856
857 MODULE_DESCRIPTION("STMFX pinctrl/GPIO driver");
858 MODULE_AUTHOR("Amelie Delaunay <amelie.delaunay@st.com>");
859 MODULE_LICENSE("GPL v2");
860