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