2 * gpio-crystalcove.c - Intel Crystal Cove GPIO Driver
4 * Copyright (C) 2012, 2014 Intel Corporation. All rights reserved.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * Author: Yang, Bin <bin.yang@intel.com>
18 #include <linux/interrupt.h>
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
21 #include <linux/gpio.h>
22 #include <linux/seq_file.h>
23 #include <linux/bitops.h>
24 #include <linux/regmap.h>
25 #include <linux/mfd/intel_soc_pmic.h>
27 #define CRYSTALCOVE_GPIO_NUM 16
28 #define CRYSTALCOVE_VGPIO_NUM 95
30 #define UPDATE_IRQ_TYPE BIT(0)
31 #define UPDATE_IRQ_MASK BIT(1)
35 #define MGPIO0IRQS0 0x19
36 #define MGPIO1IRQS0 0x1a
37 #define MGPIO0IRQSX 0x1b
38 #define MGPIO1IRQSX 0x1c
39 #define GPIO0P0CTLO 0x2b
40 #define GPIO0P0CTLI 0x33
41 #define GPIO1P0CTLO 0x3b
42 #define GPIO1P0CTLI 0x43
43 #define GPIOPANELCTL 0x52
45 #define CTLI_INTCNT_DIS (0)
46 #define CTLI_INTCNT_NE (1 << 1)
47 #define CTLI_INTCNT_PE (2 << 1)
48 #define CTLI_INTCNT_BE (3 << 1)
50 #define CTLO_DIR_IN (0)
51 #define CTLO_DIR_OUT (1 << 5)
53 #define CTLO_DRV_CMOS (0)
54 #define CTLO_DRV_OD (1 << 4)
56 #define CTLO_DRV_REN (1 << 3)
58 #define CTLO_RVAL_2KDW (0)
59 #define CTLO_RVAL_2KUP (1 << 1)
60 #define CTLO_RVAL_50KDW (2 << 1)
61 #define CTLO_RVAL_50KUP (3 << 1)
63 #define CTLO_INPUT_SET (CTLO_DRV_CMOS | CTLO_DRV_REN | CTLO_RVAL_2KUP)
64 #define CTLO_OUTPUT_SET (CTLO_DIR_OUT | CTLO_INPUT_SET)
72 * struct crystalcove_gpio - Crystal Cove GPIO controller
73 * @buslock: for bus lock/sync and unlock.
74 * @chip: the abstract gpio_chip structure.
75 * @regmap: the regmap from the parent device.
76 * @update: pending IRQ setting update, to be written to the chip upon unlock.
77 * @intcnt_value: the Interrupt Detect value to be written.
78 * @set_irq_mask: true if the IRQ mask needs to be set, false to clear.
80 struct crystalcove_gpio {
81 struct mutex buslock; /* irq_bus_lock */
82 struct gpio_chip chip;
83 struct regmap *regmap;
89 static inline int to_reg(int gpio, enum ctrl_register reg_type)
93 if (gpio >= CRYSTALCOVE_GPIO_NUM) {
95 * Virtual GPIO called from ACPI, for now we only support
106 if (reg_type == CTRL_IN) {
118 return reg + gpio % 8;
121 static void crystalcove_update_irq_mask(struct crystalcove_gpio *cg,
124 u8 mirqs0 = gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0;
125 int mask = BIT(gpio % 8);
127 if (cg->set_irq_mask)
128 regmap_update_bits(cg->regmap, mirqs0, mask, mask);
130 regmap_update_bits(cg->regmap, mirqs0, mask, 0);
133 static void crystalcove_update_irq_ctrl(struct crystalcove_gpio *cg, int gpio)
135 int reg = to_reg(gpio, CTRL_IN);
137 regmap_update_bits(cg->regmap, reg, CTLI_INTCNT_BE, cg->intcnt_value);
140 static int crystalcove_gpio_dir_in(struct gpio_chip *chip, unsigned gpio)
142 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
143 int reg = to_reg(gpio, CTRL_OUT);
148 return regmap_write(cg->regmap, reg, CTLO_INPUT_SET);
151 static int crystalcove_gpio_dir_out(struct gpio_chip *chip, unsigned gpio,
154 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
155 int reg = to_reg(gpio, CTRL_OUT);
160 return regmap_write(cg->regmap, reg, CTLO_OUTPUT_SET | value);
163 static int crystalcove_gpio_get(struct gpio_chip *chip, unsigned gpio)
165 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
167 int ret, reg = to_reg(gpio, CTRL_IN);
172 ret = regmap_read(cg->regmap, reg, &val);
179 static void crystalcove_gpio_set(struct gpio_chip *chip,
180 unsigned gpio, int value)
182 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
183 int reg = to_reg(gpio, CTRL_OUT);
189 regmap_update_bits(cg->regmap, reg, 1, 1);
191 regmap_update_bits(cg->regmap, reg, 1, 0);
194 static int crystalcove_irq_type(struct irq_data *data, unsigned type)
196 struct crystalcove_gpio *cg =
197 gpiochip_get_data(irq_data_get_irq_chip_data(data));
199 if (data->hwirq >= CRYSTALCOVE_GPIO_NUM)
204 cg->intcnt_value = CTLI_INTCNT_DIS;
206 case IRQ_TYPE_EDGE_BOTH:
207 cg->intcnt_value = CTLI_INTCNT_BE;
209 case IRQ_TYPE_EDGE_RISING:
210 cg->intcnt_value = CTLI_INTCNT_PE;
212 case IRQ_TYPE_EDGE_FALLING:
213 cg->intcnt_value = CTLI_INTCNT_NE;
219 cg->update |= UPDATE_IRQ_TYPE;
224 static void crystalcove_bus_lock(struct irq_data *data)
226 struct crystalcove_gpio *cg =
227 gpiochip_get_data(irq_data_get_irq_chip_data(data));
229 mutex_lock(&cg->buslock);
232 static void crystalcove_bus_sync_unlock(struct irq_data *data)
234 struct crystalcove_gpio *cg =
235 gpiochip_get_data(irq_data_get_irq_chip_data(data));
236 int gpio = data->hwirq;
238 if (cg->update & UPDATE_IRQ_TYPE)
239 crystalcove_update_irq_ctrl(cg, gpio);
240 if (cg->update & UPDATE_IRQ_MASK)
241 crystalcove_update_irq_mask(cg, gpio);
244 mutex_unlock(&cg->buslock);
247 static void crystalcove_irq_unmask(struct irq_data *data)
249 struct crystalcove_gpio *cg =
250 gpiochip_get_data(irq_data_get_irq_chip_data(data));
252 if (data->hwirq < CRYSTALCOVE_GPIO_NUM) {
253 cg->set_irq_mask = false;
254 cg->update |= UPDATE_IRQ_MASK;
258 static void crystalcove_irq_mask(struct irq_data *data)
260 struct crystalcove_gpio *cg =
261 gpiochip_get_data(irq_data_get_irq_chip_data(data));
263 if (data->hwirq < CRYSTALCOVE_GPIO_NUM) {
264 cg->set_irq_mask = true;
265 cg->update |= UPDATE_IRQ_MASK;
269 static struct irq_chip crystalcove_irqchip = {
270 .name = "Crystal Cove",
271 .irq_mask = crystalcove_irq_mask,
272 .irq_unmask = crystalcove_irq_unmask,
273 .irq_set_type = crystalcove_irq_type,
274 .irq_bus_lock = crystalcove_bus_lock,
275 .irq_bus_sync_unlock = crystalcove_bus_sync_unlock,
276 .flags = IRQCHIP_SKIP_SET_WAKE,
279 static irqreturn_t crystalcove_gpio_irq_handler(int irq, void *data)
281 struct crystalcove_gpio *cg = data;
287 if (regmap_read(cg->regmap, GPIO0IRQ, &p0) ||
288 regmap_read(cg->regmap, GPIO1IRQ, &p1))
291 regmap_write(cg->regmap, GPIO0IRQ, p0);
292 regmap_write(cg->regmap, GPIO1IRQ, p1);
294 pending = p0 | p1 << 8;
296 for (gpio = 0; gpio < CRYSTALCOVE_GPIO_NUM; gpio++) {
297 if (pending & BIT(gpio)) {
298 virq = irq_find_mapping(cg->chip.irqdomain, gpio);
299 handle_nested_irq(virq);
306 static void crystalcove_gpio_dbg_show(struct seq_file *s,
307 struct gpio_chip *chip)
309 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
311 unsigned int ctlo, ctli, mirqs0, mirqsx, irq;
313 for (gpio = 0; gpio < CRYSTALCOVE_GPIO_NUM; gpio++) {
314 regmap_read(cg->regmap, to_reg(gpio, CTRL_OUT), &ctlo);
315 regmap_read(cg->regmap, to_reg(gpio, CTRL_IN), &ctli);
316 regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0,
318 regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQSX : MGPIO1IRQSX,
320 regmap_read(cg->regmap, gpio < 8 ? GPIO0IRQ : GPIO1IRQ,
324 seq_printf(s, " gpio-%-2d %s %s %s %s ctlo=%2x,%s %s %s\n",
325 gpio, ctlo & CTLO_DIR_OUT ? "out" : "in ",
326 ctli & 0x1 ? "hi" : "lo",
327 ctli & CTLI_INTCNT_NE ? "fall" : " ",
328 ctli & CTLI_INTCNT_PE ? "rise" : " ",
330 mirqs0 & BIT(offset) ? "s0 mask " : "s0 unmask",
331 mirqsx & BIT(offset) ? "sx mask " : "sx unmask",
332 irq & BIT(offset) ? "pending" : " ");
336 static int crystalcove_gpio_probe(struct platform_device *pdev)
338 int irq = platform_get_irq(pdev, 0);
339 struct crystalcove_gpio *cg;
341 struct device *dev = pdev->dev.parent;
342 struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
347 cg = devm_kzalloc(&pdev->dev, sizeof(*cg), GFP_KERNEL);
351 platform_set_drvdata(pdev, cg);
353 mutex_init(&cg->buslock);
354 cg->chip.label = KBUILD_MODNAME;
355 cg->chip.direction_input = crystalcove_gpio_dir_in;
356 cg->chip.direction_output = crystalcove_gpio_dir_out;
357 cg->chip.get = crystalcove_gpio_get;
358 cg->chip.set = crystalcove_gpio_set;
360 cg->chip.ngpio = CRYSTALCOVE_VGPIO_NUM;
361 cg->chip.can_sleep = true;
362 cg->chip.parent = dev;
363 cg->chip.dbg_show = crystalcove_gpio_dbg_show;
364 cg->regmap = pmic->regmap;
366 retval = devm_gpiochip_add_data(&pdev->dev, &cg->chip, cg);
368 dev_warn(&pdev->dev, "add gpio chip error: %d\n", retval);
372 gpiochip_irqchip_add_nested(&cg->chip, &crystalcove_irqchip, 0,
373 handle_simple_irq, IRQ_TYPE_NONE);
375 retval = request_threaded_irq(irq, NULL, crystalcove_gpio_irq_handler,
376 IRQF_ONESHOT, KBUILD_MODNAME, cg);
379 dev_warn(&pdev->dev, "request irq failed: %d\n", retval);
383 gpiochip_set_nested_irqchip(&cg->chip, &crystalcove_irqchip, irq);
388 static int crystalcove_gpio_remove(struct platform_device *pdev)
390 struct crystalcove_gpio *cg = platform_get_drvdata(pdev);
391 int irq = platform_get_irq(pdev, 0);
398 static struct platform_driver crystalcove_gpio_driver = {
399 .probe = crystalcove_gpio_probe,
400 .remove = crystalcove_gpio_remove,
402 .name = "crystal_cove_gpio",
406 module_platform_driver(crystalcove_gpio_driver);
408 MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
409 MODULE_DESCRIPTION("Intel Crystal Cove GPIO Driver");
410 MODULE_LICENSE("GPL v2");