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1/*
2 * gpio-crystalcove.c - Intel Crystal Cove GPIO Driver
3 *
4 * Copyright (C) 2012, 2014 Intel Corporation. All rights reserved.
5 *
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.
9 *
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.
14 *
15 * Author: Yang, Bin <bin.yang@intel.com>
16 */
17
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>
26
27#define CRYSTALCOVE_GPIO_NUM 16
28#define CRYSTALCOVE_VGPIO_NUM 95
29
30#define UPDATE_IRQ_TYPE BIT(0)
31#define UPDATE_IRQ_MASK BIT(1)
32
33#define GPIO0IRQ 0x0b
34#define GPIO1IRQ 0x0c
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
44
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)
49
50#define CTLO_DIR_IN (0)
51#define CTLO_DIR_OUT (1 << 5)
52
53#define CTLO_DRV_CMOS (0)
54#define CTLO_DRV_OD (1 << 4)
55
56#define CTLO_DRV_REN (1 << 3)
57
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)
62
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)
65
66enum ctrl_register {
67 CTRL_IN,
68 CTRL_OUT,
69};
70
71/**
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.
79 */
80struct crystalcove_gpio {
81 struct mutex buslock; /* irq_bus_lock */
82 struct gpio_chip chip;
83 struct regmap *regmap;
84 int update;
85 int intcnt_value;
86 bool set_irq_mask;
87};
88
89static inline int to_reg(int gpio, enum ctrl_register reg_type)
90{
91 int reg;
92
93 if (gpio == 94)
94 return GPIOPANELCTL;
95
96 if (reg_type == CTRL_IN) {
97 if (gpio < 8)
98 reg = GPIO0P0CTLI;
99 else
100 reg = GPIO1P0CTLI;
101 } else {
102 if (gpio < 8)
103 reg = GPIO0P0CTLO;
104 else
105 reg = GPIO1P0CTLO;
106 }
107
108 return reg + gpio % 8;
109}
110
111static void crystalcove_update_irq_mask(struct crystalcove_gpio *cg,
112 int gpio)
113{
114 u8 mirqs0 = gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0;
115 int mask = BIT(gpio % 8);
116
117 if (cg->set_irq_mask)
118 regmap_update_bits(cg->regmap, mirqs0, mask, mask);
119 else
120 regmap_update_bits(cg->regmap, mirqs0, mask, 0);
121}
122
123static void crystalcove_update_irq_ctrl(struct crystalcove_gpio *cg, int gpio)
124{
125 int reg = to_reg(gpio, CTRL_IN);
126
127 regmap_update_bits(cg->regmap, reg, CTLI_INTCNT_BE, cg->intcnt_value);
128}
129
130static int crystalcove_gpio_dir_in(struct gpio_chip *chip, unsigned gpio)
131{
132 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
133
134 if (gpio > CRYSTALCOVE_VGPIO_NUM)
135 return 0;
136
137 return regmap_write(cg->regmap, to_reg(gpio, CTRL_OUT),
138 CTLO_INPUT_SET);
139}
140
141static int crystalcove_gpio_dir_out(struct gpio_chip *chip, unsigned gpio,
142 int value)
143{
144 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
145
146 if (gpio > CRYSTALCOVE_VGPIO_NUM)
147 return 0;
148
149 return regmap_write(cg->regmap, to_reg(gpio, CTRL_OUT),
150 CTLO_OUTPUT_SET | value);
151}
152
153static int crystalcove_gpio_get(struct gpio_chip *chip, unsigned gpio)
154{
155 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
156 int ret;
157 unsigned int val;
158
159 if (gpio > CRYSTALCOVE_VGPIO_NUM)
160 return 0;
161
162 ret = regmap_read(cg->regmap, to_reg(gpio, CTRL_IN), &val);
163 if (ret)
164 return ret;
165
166 return val & 0x1;
167}
168
169static void crystalcove_gpio_set(struct gpio_chip *chip,
170 unsigned gpio, int value)
171{
172 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
173
174 if (gpio > CRYSTALCOVE_VGPIO_NUM)
175 return;
176
177 if (value)
178 regmap_update_bits(cg->regmap, to_reg(gpio, CTRL_OUT), 1, 1);
179 else
180 regmap_update_bits(cg->regmap, to_reg(gpio, CTRL_OUT), 1, 0);
181}
182
183static int crystalcove_irq_type(struct irq_data *data, unsigned type)
184{
185 struct crystalcove_gpio *cg =
186 gpiochip_get_data(irq_data_get_irq_chip_data(data));
187
188 switch (type) {
189 case IRQ_TYPE_NONE:
190 cg->intcnt_value = CTLI_INTCNT_DIS;
191 break;
192 case IRQ_TYPE_EDGE_BOTH:
193 cg->intcnt_value = CTLI_INTCNT_BE;
194 break;
195 case IRQ_TYPE_EDGE_RISING:
196 cg->intcnt_value = CTLI_INTCNT_PE;
197 break;
198 case IRQ_TYPE_EDGE_FALLING:
199 cg->intcnt_value = CTLI_INTCNT_NE;
200 break;
201 default:
202 return -EINVAL;
203 }
204
205 cg->update |= UPDATE_IRQ_TYPE;
206
207 return 0;
208}
209
210static void crystalcove_bus_lock(struct irq_data *data)
211{
212 struct crystalcove_gpio *cg =
213 gpiochip_get_data(irq_data_get_irq_chip_data(data));
214
215 mutex_lock(&cg->buslock);
216}
217
218static void crystalcove_bus_sync_unlock(struct irq_data *data)
219{
220 struct crystalcove_gpio *cg =
221 gpiochip_get_data(irq_data_get_irq_chip_data(data));
222 int gpio = data->hwirq;
223
224 if (cg->update & UPDATE_IRQ_TYPE)
225 crystalcove_update_irq_ctrl(cg, gpio);
226 if (cg->update & UPDATE_IRQ_MASK)
227 crystalcove_update_irq_mask(cg, gpio);
228 cg->update = 0;
229
230 mutex_unlock(&cg->buslock);
231}
232
233static void crystalcove_irq_unmask(struct irq_data *data)
234{
235 struct crystalcove_gpio *cg =
236 gpiochip_get_data(irq_data_get_irq_chip_data(data));
237
238 cg->set_irq_mask = false;
239 cg->update |= UPDATE_IRQ_MASK;
240}
241
242static void crystalcove_irq_mask(struct irq_data *data)
243{
244 struct crystalcove_gpio *cg =
245 gpiochip_get_data(irq_data_get_irq_chip_data(data));
246
247 cg->set_irq_mask = true;
248 cg->update |= UPDATE_IRQ_MASK;
249}
250
251static struct irq_chip crystalcove_irqchip = {
252 .name = "Crystal Cove",
253 .irq_mask = crystalcove_irq_mask,
254 .irq_unmask = crystalcove_irq_unmask,
255 .irq_set_type = crystalcove_irq_type,
256 .irq_bus_lock = crystalcove_bus_lock,
257 .irq_bus_sync_unlock = crystalcove_bus_sync_unlock,
258 .flags = IRQCHIP_SKIP_SET_WAKE,
259};
260
261static irqreturn_t crystalcove_gpio_irq_handler(int irq, void *data)
262{
263 struct crystalcove_gpio *cg = data;
264 unsigned int p0, p1;
265 int pending;
266 int gpio;
267 unsigned int virq;
268
269 if (regmap_read(cg->regmap, GPIO0IRQ, &p0) ||
270 regmap_read(cg->regmap, GPIO1IRQ, &p1))
271 return IRQ_NONE;
272
273 regmap_write(cg->regmap, GPIO0IRQ, p0);
274 regmap_write(cg->regmap, GPIO1IRQ, p1);
275
276 pending = p0 | p1 << 8;
277
278 for (gpio = 0; gpio < CRYSTALCOVE_GPIO_NUM; gpio++) {
279 if (pending & BIT(gpio)) {
280 virq = irq_find_mapping(cg->chip.irqdomain, gpio);
281 handle_nested_irq(virq);
282 }
283 }
284
285 return IRQ_HANDLED;
286}
287
288static void crystalcove_gpio_dbg_show(struct seq_file *s,
289 struct gpio_chip *chip)
290{
291 struct crystalcove_gpio *cg = gpiochip_get_data(chip);
292 int gpio, offset;
293 unsigned int ctlo, ctli, mirqs0, mirqsx, irq;
294
295 for (gpio = 0; gpio < CRYSTALCOVE_GPIO_NUM; gpio++) {
296 regmap_read(cg->regmap, to_reg(gpio, CTRL_OUT), &ctlo);
297 regmap_read(cg->regmap, to_reg(gpio, CTRL_IN), &ctli);
298 regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0,
299 &mirqs0);
300 regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQSX : MGPIO1IRQSX,
301 &mirqsx);
302 regmap_read(cg->regmap, gpio < 8 ? GPIO0IRQ : GPIO1IRQ,
303 &irq);
304
305 offset = gpio % 8;
306 seq_printf(s, " gpio-%-2d %s %s %s %s ctlo=%2x,%s %s %s\n",
307 gpio, ctlo & CTLO_DIR_OUT ? "out" : "in ",
308 ctli & 0x1 ? "hi" : "lo",
309 ctli & CTLI_INTCNT_NE ? "fall" : " ",
310 ctli & CTLI_INTCNT_PE ? "rise" : " ",
311 ctlo,
312 mirqs0 & BIT(offset) ? "s0 mask " : "s0 unmask",
313 mirqsx & BIT(offset) ? "sx mask " : "sx unmask",
314 irq & BIT(offset) ? "pending" : " ");
315 }
316}
317
318static int crystalcove_gpio_probe(struct platform_device *pdev)
319{
320 int irq = platform_get_irq(pdev, 0);
321 struct crystalcove_gpio *cg;
322 int retval;
323 struct device *dev = pdev->dev.parent;
324 struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
325
326 if (irq < 0)
327 return irq;
328
329 cg = devm_kzalloc(&pdev->dev, sizeof(*cg), GFP_KERNEL);
330 if (!cg)
331 return -ENOMEM;
332
333 platform_set_drvdata(pdev, cg);
334
335 mutex_init(&cg->buslock);
336 cg->chip.label = KBUILD_MODNAME;
337 cg->chip.direction_input = crystalcove_gpio_dir_in;
338 cg->chip.direction_output = crystalcove_gpio_dir_out;
339 cg->chip.get = crystalcove_gpio_get;
340 cg->chip.set = crystalcove_gpio_set;
341 cg->chip.base = -1;
342 cg->chip.ngpio = CRYSTALCOVE_VGPIO_NUM;
343 cg->chip.can_sleep = true;
344 cg->chip.parent = dev;
345 cg->chip.dbg_show = crystalcove_gpio_dbg_show;
346 cg->regmap = pmic->regmap;
347
348 retval = devm_gpiochip_add_data(&pdev->dev, &cg->chip, cg);
349 if (retval) {
350 dev_warn(&pdev->dev, "add gpio chip error: %d\n", retval);
351 return retval;
352 }
353
354 gpiochip_irqchip_add(&cg->chip, &crystalcove_irqchip, 0,
355 handle_simple_irq, IRQ_TYPE_NONE);
356
357 retval = request_threaded_irq(irq, NULL, crystalcove_gpio_irq_handler,
358 IRQF_ONESHOT, KBUILD_MODNAME, cg);
359
360 if (retval) {
361 dev_warn(&pdev->dev, "request irq failed: %d\n", retval);
362 return retval;
363 }
364
365 return 0;
366}
367
368static int crystalcove_gpio_remove(struct platform_device *pdev)
369{
370 struct crystalcove_gpio *cg = platform_get_drvdata(pdev);
371 int irq = platform_get_irq(pdev, 0);
372
373 if (irq >= 0)
374 free_irq(irq, cg);
375 return 0;
376}
377
378static struct platform_driver crystalcove_gpio_driver = {
379 .probe = crystalcove_gpio_probe,
380 .remove = crystalcove_gpio_remove,
381 .driver = {
382 .name = "crystal_cove_gpio",
383 },
384};
385
386module_platform_driver(crystalcove_gpio_driver);
387
388MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
389MODULE_DESCRIPTION("Intel Crystal Cove GPIO Driver");
390MODULE_LICENSE("GPL v2");