1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Intel Crystal Cove GPIO Driver
4 *
5 * Copyright (C) 2012, 2014 Intel Corporation. All rights reserved.
6 *
7 * Author: Yang, Bin <bin.yang@intel.com>
8 */
9
10 #include <linux/bitops.h>
11 #include <linux/gpio/driver.h>
12 #include <linux/interrupt.h>
13 #include <linux/mfd/intel_soc_pmic.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17 #include <linux/seq_file.h>
18 #include <linux/types.h>
19
20 #define CRYSTALCOVE_GPIO_NUM 16
21 #define CRYSTALCOVE_VGPIO_NUM 95
22
23 #define UPDATE_IRQ_TYPE BIT(0)
24 #define UPDATE_IRQ_MASK BIT(1)
25
26 #define GPIO0IRQ 0x0b
27 #define GPIO1IRQ 0x0c
28 #define MGPIO0IRQS0 0x19
29 #define MGPIO1IRQS0 0x1a
30 #define MGPIO0IRQSX 0x1b
31 #define MGPIO1IRQSX 0x1c
32 #define GPIO0P0CTLO 0x2b
33 #define GPIO0P0CTLI 0x33
34 #define GPIO1P0CTLO 0x3b
35 #define GPIO1P0CTLI 0x43
36 #define GPIOPANELCTL 0x52
37
38 #define CTLI_INTCNT_DIS (0)
39 #define CTLI_INTCNT_NE (1 << 1)
40 #define CTLI_INTCNT_PE (2 << 1)
41 #define CTLI_INTCNT_BE (3 << 1)
42
43 #define CTLO_DIR_IN (0)
44 #define CTLO_DIR_OUT (1 << 5)
45
46 #define CTLO_DRV_CMOS (0)
47 #define CTLO_DRV_OD (1 << 4)
48
49 #define CTLO_DRV_REN (1 << 3)
50
51 #define CTLO_RVAL_2KDW (0)
52 #define CTLO_RVAL_2KUP (1 << 1)
53 #define CTLO_RVAL_50KDW (2 << 1)
54 #define CTLO_RVAL_50KUP (3 << 1)
55
56 #define CTLO_INPUT_SET (CTLO_DRV_CMOS | CTLO_DRV_REN | CTLO_RVAL_2KUP)
57 #define CTLO_OUTPUT_SET (CTLO_DIR_OUT | CTLO_INPUT_SET)
58
59 enum ctrl_register {
60 CTRL_IN,
61 CTRL_OUT,
62 };
63
64 /**
65 * struct crystalcove_gpio - Crystal Cove GPIO controller
66 * @buslock: for bus lock/sync and unlock.
67 * @chip: the abstract gpio_chip structure.
68 * @regmap: the regmap from the parent device.
69 * @update: pending IRQ setting update, to be written to the chip upon unlock.
70 * @intcnt_value: the Interrupt Detect value to be written.
71 * @set_irq_mask: true if the IRQ mask needs to be set, false to clear.
72 */
73 struct crystalcove_gpio {
74 struct mutex buslock; /* irq_bus_lock */
75 struct gpio_chip chip;
76 struct regmap *regmap;
77 int update;
78 int intcnt_value;
79 bool set_irq_mask;
80 };
81
to_reg(int gpio,enum ctrl_register reg_type)82 static inline int to_reg(int gpio, enum ctrl_register reg_type)
83 {
84 int reg;
85
86 if (gpio >= CRYSTALCOVE_GPIO_NUM) {
87 /*
88 * Virtual GPIO called from ACPI, for now we only support
89 * the panel ctl.
90 */
91 switch (gpio) {
92 case 0x5e:
93 return GPIOPANELCTL;
94 default:
95 return -ENOTSUPP;
96 }
97 }
98
99 if (reg_type == CTRL_IN) {
100 if (gpio < 8)
101 reg = GPIO0P0CTLI;
102 else
103 reg = GPIO1P0CTLI;
104 } else {
105 if (gpio < 8)
106 reg = GPIO0P0CTLO;
107 else
108 reg = GPIO1P0CTLO;
109 }
110
111 return reg + gpio % 8;
112 }
113
crystalcove_update_irq_mask(struct crystalcove_gpio * cg,int gpio)114 static void crystalcove_update_irq_mask(struct crystalcove_gpio *cg, int gpio)
115 {
116 u8 mirqs0 = gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0;
117 int mask = BIT(gpio % 8);
118
119 if (cg->set_irq_mask)
120 regmap_update_bits(cg->regmap, mirqs0, mask, mask);
121 else
122 regmap_update_bits(cg->regmap, mirqs0, mask, 0);
123 }
124
crystalcove_update_irq_ctrl(struct crystalcove_gpio * cg,int gpio)125 static void crystalcove_update_irq_ctrl(struct crystalcove_gpio *cg, int gpio)
126 {
127 int reg = to_reg(gpio, CTRL_IN);
128
129 regmap_update_bits(cg->regmap, reg, CTLI_INTCNT_BE, cg->intcnt_value);
130 }
131
crystalcove_gpio_dir_in(struct gpio_chip * chip,unsigned int gpio)132 static int crystalcove_gpio_dir_in(struct gpio_chip *chip, unsigned int gpio)
133 {
134 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
135 int reg = to_reg(gpio, CTRL_OUT);
136
137 if (reg < 0)
138 return 0;
139
140 return regmap_write(cg->regmap, reg, CTLO_INPUT_SET);
141 }
142
crystalcove_gpio_dir_out(struct gpio_chip * chip,unsigned int gpio,int value)143 static int crystalcove_gpio_dir_out(struct gpio_chip *chip, unsigned int gpio, int value)
144 {
145 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
146 int reg = to_reg(gpio, CTRL_OUT);
147
148 if (reg < 0)
149 return 0;
150
151 return regmap_write(cg->regmap, reg, CTLO_OUTPUT_SET | value);
152 }
153
crystalcove_gpio_get(struct gpio_chip * chip,unsigned int gpio)154 static int crystalcove_gpio_get(struct gpio_chip *chip, unsigned int gpio)
155 {
156 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
157 unsigned int val;
158 int ret, reg = to_reg(gpio, CTRL_IN);
159
160 if (reg < 0)
161 return 0;
162
163 ret = regmap_read(cg->regmap, reg, &val);
164 if (ret)
165 return ret;
166
167 return val & 0x1;
168 }
169
crystalcove_gpio_set(struct gpio_chip * chip,unsigned int gpio,int value)170 static void crystalcove_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
171 {
172 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
173 int reg = to_reg(gpio, CTRL_OUT);
174
175 if (reg < 0)
176 return;
177
178 if (value)
179 regmap_update_bits(cg->regmap, reg, 1, 1);
180 else
181 regmap_update_bits(cg->regmap, reg, 1, 0);
182 }
183
crystalcove_irq_type(struct irq_data * data,unsigned int type)184 static int crystalcove_irq_type(struct irq_data *data, unsigned int type)
185 {
186 struct crystalcove_gpio *cg = gpiochip_get_data(irq_data_get_irq_chip_data(data));
187 irq_hw_number_t hwirq = irqd_to_hwirq(data);
188
189 if (hwirq >= CRYSTALCOVE_GPIO_NUM)
190 return 0;
191
192 switch (type) {
193 case IRQ_TYPE_NONE:
194 cg->intcnt_value = CTLI_INTCNT_DIS;
195 break;
196 case IRQ_TYPE_EDGE_BOTH:
197 cg->intcnt_value = CTLI_INTCNT_BE;
198 break;
199 case IRQ_TYPE_EDGE_RISING:
200 cg->intcnt_value = CTLI_INTCNT_PE;
201 break;
202 case IRQ_TYPE_EDGE_FALLING:
203 cg->intcnt_value = CTLI_INTCNT_NE;
204 break;
205 default:
206 return -EINVAL;
207 }
208
209 cg->update |= UPDATE_IRQ_TYPE;
210
211 return 0;
212 }
213
crystalcove_bus_lock(struct irq_data * data)214 static void crystalcove_bus_lock(struct irq_data *data)
215 {
216 struct crystalcove_gpio *cg = gpiochip_get_data(irq_data_get_irq_chip_data(data));
217
218 mutex_lock(&cg->buslock);
219 }
220
crystalcove_bus_sync_unlock(struct irq_data * data)221 static void crystalcove_bus_sync_unlock(struct irq_data *data)
222 {
223 struct crystalcove_gpio *cg = gpiochip_get_data(irq_data_get_irq_chip_data(data));
224 irq_hw_number_t hwirq = irqd_to_hwirq(data);
225
226 if (cg->update & UPDATE_IRQ_TYPE)
227 crystalcove_update_irq_ctrl(cg, hwirq);
228 if (cg->update & UPDATE_IRQ_MASK)
229 crystalcove_update_irq_mask(cg, hwirq);
230 cg->update = 0;
231
232 mutex_unlock(&cg->buslock);
233 }
234
crystalcove_irq_unmask(struct irq_data * data)235 static void crystalcove_irq_unmask(struct irq_data *data)
236 {
237 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
238 struct crystalcove_gpio *cg = gpiochip_get_data(gc);
239 irq_hw_number_t hwirq = irqd_to_hwirq(data);
240
241 if (hwirq >= CRYSTALCOVE_GPIO_NUM)
242 return;
243
244 gpiochip_enable_irq(gc, hwirq);
245
246 cg->set_irq_mask = false;
247 cg->update |= UPDATE_IRQ_MASK;
248 }
249
crystalcove_irq_mask(struct irq_data * data)250 static void crystalcove_irq_mask(struct irq_data *data)
251 {
252 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
253 struct crystalcove_gpio *cg = gpiochip_get_data(gc);
254 irq_hw_number_t hwirq = irqd_to_hwirq(data);
255
256 if (hwirq >= CRYSTALCOVE_GPIO_NUM)
257 return;
258
259 cg->set_irq_mask = true;
260 cg->update |= UPDATE_IRQ_MASK;
261
262 gpiochip_disable_irq(gc, hwirq);
263 }
264
265 static const struct irq_chip crystalcove_irqchip = {
266 .name = "Crystal Cove",
267 .irq_mask = crystalcove_irq_mask,
268 .irq_unmask = crystalcove_irq_unmask,
269 .irq_set_type = crystalcove_irq_type,
270 .irq_bus_lock = crystalcove_bus_lock,
271 .irq_bus_sync_unlock = crystalcove_bus_sync_unlock,
272 .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_IMMUTABLE,
273 GPIOCHIP_IRQ_RESOURCE_HELPERS,
274 };
275
crystalcove_gpio_irq_handler(int irq,void * data)276 static irqreturn_t crystalcove_gpio_irq_handler(int irq, void *data)
277 {
278 struct crystalcove_gpio *cg = data;
279 unsigned long pending;
280 unsigned int p0, p1;
281 int gpio;
282 unsigned int virq;
283
284 if (regmap_read(cg->regmap, GPIO0IRQ, &p0) ||
285 regmap_read(cg->regmap, GPIO1IRQ, &p1))
286 return IRQ_NONE;
287
288 regmap_write(cg->regmap, GPIO0IRQ, p0);
289 regmap_write(cg->regmap, GPIO1IRQ, p1);
290
291 pending = p0 | p1 << 8;
292
293 for_each_set_bit(gpio, &pending, CRYSTALCOVE_GPIO_NUM) {
294 virq = irq_find_mapping(cg->chip.irq.domain, gpio);
295 handle_nested_irq(virq);
296 }
297
298 return IRQ_HANDLED;
299 }
300
crystalcove_gpio_dbg_show(struct seq_file * s,struct gpio_chip * chip)301 static void crystalcove_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
302 {
303 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
304 int gpio, offset;
305 unsigned int ctlo, ctli, mirqs0, mirqsx, irq;
306
307 for (gpio = 0; gpio < CRYSTALCOVE_GPIO_NUM; gpio++) {
308 regmap_read(cg->regmap, to_reg(gpio, CTRL_OUT), &ctlo);
309 regmap_read(cg->regmap, to_reg(gpio, CTRL_IN), &ctli);
310 regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0,
311 &mirqs0);
312 regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQSX : MGPIO1IRQSX,
313 &mirqsx);
314 regmap_read(cg->regmap, gpio < 8 ? GPIO0IRQ : GPIO1IRQ,
315 &irq);
316
317 offset = gpio % 8;
318 seq_printf(s, " gpio-%-2d %s %s %s %s ctlo=%2x,%s %s %s\n",
319 gpio, ctlo & CTLO_DIR_OUT ? "out" : "in ",
320 ctli & 0x1 ? "hi" : "lo",
321 ctli & CTLI_INTCNT_NE ? "fall" : " ",
322 ctli & CTLI_INTCNT_PE ? "rise" : " ",
323 ctlo,
324 mirqs0 & BIT(offset) ? "s0 mask " : "s0 unmask",
325 mirqsx & BIT(offset) ? "sx mask " : "sx unmask",
326 irq & BIT(offset) ? "pending" : " ");
327 }
328 }
329
crystalcove_gpio_probe(struct platform_device * pdev)330 static int crystalcove_gpio_probe(struct platform_device *pdev)
331 {
332 int irq = platform_get_irq(pdev, 0);
333 struct crystalcove_gpio *cg;
334 int retval;
335 struct device *dev = pdev->dev.parent;
336 struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
337 struct gpio_irq_chip *girq;
338
339 if (irq < 0)
340 return irq;
341
342 cg = devm_kzalloc(&pdev->dev, sizeof(*cg), GFP_KERNEL);
343 if (!cg)
344 return -ENOMEM;
345
346 mutex_init(&cg->buslock);
347 cg->chip.label = KBUILD_MODNAME;
348 cg->chip.direction_input = crystalcove_gpio_dir_in;
349 cg->chip.direction_output = crystalcove_gpio_dir_out;
350 cg->chip.get = crystalcove_gpio_get;
351 cg->chip.set = crystalcove_gpio_set;
352 cg->chip.base = -1;
353 cg->chip.ngpio = CRYSTALCOVE_VGPIO_NUM;
354 cg->chip.can_sleep = true;
355 cg->chip.parent = dev;
356 cg->chip.dbg_show = crystalcove_gpio_dbg_show;
357 cg->regmap = pmic->regmap;
358
359 girq = &cg->chip.irq;
360 gpio_irq_chip_set_chip(girq, &crystalcove_irqchip);
361 /* This will let us handle the parent IRQ in the driver */
362 girq->parent_handler = NULL;
363 girq->num_parents = 0;
364 girq->parents = NULL;
365 girq->default_type = IRQ_TYPE_NONE;
366 girq->handler = handle_simple_irq;
367 girq->threaded = true;
368
369 retval = devm_request_threaded_irq(&pdev->dev, irq, NULL,
370 crystalcove_gpio_irq_handler,
371 IRQF_ONESHOT, KBUILD_MODNAME, cg);
372 if (retval) {
373 dev_warn(&pdev->dev, "request irq failed: %d\n", retval);
374 return retval;
375 }
376
377 retval = devm_gpiochip_add_data(&pdev->dev, &cg->chip, cg);
378 if (retval)
379 return retval;
380
381 /* Distuingish IRQ domain from others sharing (MFD) the same fwnode */
382 irq_domain_update_bus_token(cg->chip.irq.domain, DOMAIN_BUS_WIRED);
383
384 return 0;
385 }
386
387 static struct platform_driver crystalcove_gpio_driver = {
388 .probe = crystalcove_gpio_probe,
389 .driver = {
390 .name = "crystal_cove_gpio",
391 },
392 };
393 module_platform_driver(crystalcove_gpio_driver);
394
395 MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
396 MODULE_DESCRIPTION("Intel Crystal Cove GPIO Driver");
397 MODULE_LICENSE("GPL v2");
398