Merge remote-tracking branch 'stable/linux-5.15.y' into rpi-5.15.y
[platform/kernel/linux-rpi.git] / drivers / mfd / rc5t583-irq.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Interrupt driver for RICOH583 power management chip.
4  *
5  * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
6  * Author: Laxman dewangan <ldewangan@nvidia.com>
7  *
8  * based on code
9  *      Copyright (C) 2011 RICOH COMPANY,LTD
10  */
11 #include <linux/interrupt.h>
12 #include <linux/irq.h>
13 #include <linux/i2c.h>
14 #include <linux/mfd/rc5t583.h>
15
16 enum int_type {
17         SYS_INT  = 0x1,
18         DCDC_INT = 0x2,
19         RTC_INT  = 0x4,
20         ADC_INT  = 0x8,
21         GPIO_INT = 0x10,
22 };
23
24 static int gpedge_add[] = {
25         RC5T583_GPIO_GPEDGE2,
26         RC5T583_GPIO_GPEDGE2
27 };
28
29 static int irq_en_add[] = {
30         RC5T583_INT_EN_SYS1,
31         RC5T583_INT_EN_SYS2,
32         RC5T583_INT_EN_DCDC,
33         RC5T583_INT_EN_RTC,
34         RC5T583_INT_EN_ADC1,
35         RC5T583_INT_EN_ADC2,
36         RC5T583_INT_EN_ADC3,
37         RC5T583_GPIO_EN_INT
38 };
39
40 static int irq_mon_add[] = {
41         RC5T583_INT_MON_SYS1,
42         RC5T583_INT_MON_SYS2,
43         RC5T583_INT_MON_DCDC,
44         RC5T583_INT_MON_RTC,
45         RC5T583_INT_IR_ADCL,
46         RC5T583_INT_IR_ADCH,
47         RC5T583_INT_IR_ADCEND,
48         RC5T583_INT_IR_GPIOF,
49         RC5T583_INT_IR_GPIOR
50 };
51
52 static int irq_clr_add[] = {
53         RC5T583_INT_IR_SYS1,
54         RC5T583_INT_IR_SYS2,
55         RC5T583_INT_IR_DCDC,
56         RC5T583_INT_IR_RTC,
57         RC5T583_INT_IR_ADCL,
58         RC5T583_INT_IR_ADCH,
59         RC5T583_INT_IR_ADCEND,
60         RC5T583_INT_IR_GPIOF,
61         RC5T583_INT_IR_GPIOR
62 };
63
64 static int main_int_type[] = {
65         SYS_INT,
66         SYS_INT,
67         DCDC_INT,
68         RTC_INT,
69         ADC_INT,
70         ADC_INT,
71         ADC_INT,
72         GPIO_INT,
73         GPIO_INT,
74 };
75
76 struct rc5t583_irq_data {
77         u8      int_type;
78         u8      master_bit;
79         u8      int_en_bit;
80         u8      mask_reg_index;
81         int     grp_index;
82 };
83
84 #define RC5T583_IRQ(_int_type, _master_bit, _grp_index, \
85                         _int_bit, _mask_ind)            \
86         {                                               \
87                 .int_type       = _int_type,            \
88                 .master_bit     = _master_bit,          \
89                 .grp_index      = _grp_index,           \
90                 .int_en_bit     = _int_bit,             \
91                 .mask_reg_index = _mask_ind,            \
92         }
93
94 static const struct rc5t583_irq_data rc5t583_irqs[RC5T583_MAX_IRQS] = {
95         [RC5T583_IRQ_ONKEY]             = RC5T583_IRQ(SYS_INT,  0, 0, 0, 0),
96         [RC5T583_IRQ_ACOK]              = RC5T583_IRQ(SYS_INT,  0, 1, 1, 0),
97         [RC5T583_IRQ_LIDOPEN]           = RC5T583_IRQ(SYS_INT,  0, 2, 2, 0),
98         [RC5T583_IRQ_PREOT]             = RC5T583_IRQ(SYS_INT,  0, 3, 3, 0),
99         [RC5T583_IRQ_CLKSTP]            = RC5T583_IRQ(SYS_INT,  0, 4, 4, 0),
100         [RC5T583_IRQ_ONKEY_OFF]         = RC5T583_IRQ(SYS_INT,  0, 5, 5, 0),
101         [RC5T583_IRQ_WD]                = RC5T583_IRQ(SYS_INT,  0, 7, 7, 0),
102         [RC5T583_IRQ_EN_PWRREQ1]        = RC5T583_IRQ(SYS_INT,  0, 8, 0, 1),
103         [RC5T583_IRQ_EN_PWRREQ2]        = RC5T583_IRQ(SYS_INT,  0, 9, 1, 1),
104         [RC5T583_IRQ_PRE_VINDET]        = RC5T583_IRQ(SYS_INT,  0, 10, 2, 1),
105
106         [RC5T583_IRQ_DC0LIM]            = RC5T583_IRQ(DCDC_INT, 1, 0, 0, 2),
107         [RC5T583_IRQ_DC1LIM]            = RC5T583_IRQ(DCDC_INT, 1, 1, 1, 2),
108         [RC5T583_IRQ_DC2LIM]            = RC5T583_IRQ(DCDC_INT, 1, 2, 2, 2),
109         [RC5T583_IRQ_DC3LIM]            = RC5T583_IRQ(DCDC_INT, 1, 3, 3, 2),
110
111         [RC5T583_IRQ_CTC]               = RC5T583_IRQ(RTC_INT,  2, 0, 0, 3),
112         [RC5T583_IRQ_YALE]              = RC5T583_IRQ(RTC_INT,  2, 5, 5, 3),
113         [RC5T583_IRQ_DALE]              = RC5T583_IRQ(RTC_INT,  2, 6, 6, 3),
114         [RC5T583_IRQ_WALE]              = RC5T583_IRQ(RTC_INT,  2, 7, 7, 3),
115
116         [RC5T583_IRQ_AIN1L]             = RC5T583_IRQ(ADC_INT,  3, 0, 0, 4),
117         [RC5T583_IRQ_AIN2L]             = RC5T583_IRQ(ADC_INT,  3, 1, 1, 4),
118         [RC5T583_IRQ_AIN3L]             = RC5T583_IRQ(ADC_INT,  3, 2, 2, 4),
119         [RC5T583_IRQ_VBATL]             = RC5T583_IRQ(ADC_INT,  3, 3, 3, 4),
120         [RC5T583_IRQ_VIN3L]             = RC5T583_IRQ(ADC_INT,  3, 4, 4, 4),
121         [RC5T583_IRQ_VIN8L]             = RC5T583_IRQ(ADC_INT,  3, 5, 5, 4),
122         [RC5T583_IRQ_AIN1H]             = RC5T583_IRQ(ADC_INT,  3, 6, 0, 5),
123         [RC5T583_IRQ_AIN2H]             = RC5T583_IRQ(ADC_INT,  3, 7, 1, 5),
124         [RC5T583_IRQ_AIN3H]             = RC5T583_IRQ(ADC_INT,  3, 8, 2, 5),
125         [RC5T583_IRQ_VBATH]             = RC5T583_IRQ(ADC_INT,  3, 9, 3, 5),
126         [RC5T583_IRQ_VIN3H]             = RC5T583_IRQ(ADC_INT,  3, 10, 4, 5),
127         [RC5T583_IRQ_VIN8H]             = RC5T583_IRQ(ADC_INT,  3, 11, 5, 5),
128         [RC5T583_IRQ_ADCEND]            = RC5T583_IRQ(ADC_INT,  3, 12, 0, 6),
129
130         [RC5T583_IRQ_GPIO0]             = RC5T583_IRQ(GPIO_INT, 4, 0, 0, 7),
131         [RC5T583_IRQ_GPIO1]             = RC5T583_IRQ(GPIO_INT, 4, 1, 1, 7),
132         [RC5T583_IRQ_GPIO2]             = RC5T583_IRQ(GPIO_INT, 4, 2, 2, 7),
133         [RC5T583_IRQ_GPIO3]             = RC5T583_IRQ(GPIO_INT, 4, 3, 3, 7),
134         [RC5T583_IRQ_GPIO4]             = RC5T583_IRQ(GPIO_INT, 4, 4, 4, 7),
135         [RC5T583_IRQ_GPIO5]             = RC5T583_IRQ(GPIO_INT, 4, 5, 5, 7),
136         [RC5T583_IRQ_GPIO6]             = RC5T583_IRQ(GPIO_INT, 4, 6, 6, 7),
137         [RC5T583_IRQ_GPIO7]             = RC5T583_IRQ(GPIO_INT, 4, 7, 7, 7),
138 };
139
140 static void rc5t583_irq_lock(struct irq_data *irq_data)
141 {
142         struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
143         mutex_lock(&rc5t583->irq_lock);
144 }
145
146 static void rc5t583_irq_unmask(struct irq_data *irq_data)
147 {
148         struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
149         unsigned int __irq = irq_data->irq - rc5t583->irq_base;
150         const struct rc5t583_irq_data *data = &rc5t583_irqs[__irq];
151
152         rc5t583->group_irq_en[data->grp_index] |= 1 << data->grp_index;
153         rc5t583->intc_inten_reg |= 1 << data->master_bit;
154         rc5t583->irq_en_reg[data->mask_reg_index] |= 1 << data->int_en_bit;
155 }
156
157 static void rc5t583_irq_mask(struct irq_data *irq_data)
158 {
159         struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
160         unsigned int __irq = irq_data->irq - rc5t583->irq_base;
161         const struct rc5t583_irq_data *data = &rc5t583_irqs[__irq];
162
163         rc5t583->group_irq_en[data->grp_index] &= ~(1 << data->grp_index);
164         if (!rc5t583->group_irq_en[data->grp_index])
165                 rc5t583->intc_inten_reg &= ~(1 << data->master_bit);
166
167         rc5t583->irq_en_reg[data->mask_reg_index] &= ~(1 << data->int_en_bit);
168 }
169
170 static int rc5t583_irq_set_type(struct irq_data *irq_data, unsigned int type)
171 {
172         struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
173         unsigned int __irq = irq_data->irq - rc5t583->irq_base;
174         const struct rc5t583_irq_data *data = &rc5t583_irqs[__irq];
175         int val = 0;
176         int gpedge_index;
177         int gpedge_bit_pos;
178
179         /* Supporting only trigger level inetrrupt */
180         if ((data->int_type & GPIO_INT) && (type & IRQ_TYPE_EDGE_BOTH)) {
181                 gpedge_index = data->int_en_bit / 4;
182                 gpedge_bit_pos = data->int_en_bit % 4;
183
184                 if (type & IRQ_TYPE_EDGE_FALLING)
185                         val |= 0x2;
186
187                 if (type & IRQ_TYPE_EDGE_RISING)
188                         val |= 0x1;
189
190                 rc5t583->gpedge_reg[gpedge_index] &= ~(3 << gpedge_bit_pos);
191                 rc5t583->gpedge_reg[gpedge_index] |= (val << gpedge_bit_pos);
192                 rc5t583_irq_unmask(irq_data);
193                 return 0;
194         }
195         return -EINVAL;
196 }
197
198 static void rc5t583_irq_sync_unlock(struct irq_data *irq_data)
199 {
200         struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
201         int i;
202         int ret;
203
204         for (i = 0; i < ARRAY_SIZE(rc5t583->gpedge_reg); i++) {
205                 ret = rc5t583_write(rc5t583->dev, gpedge_add[i],
206                                 rc5t583->gpedge_reg[i]);
207                 if (ret < 0)
208                         dev_warn(rc5t583->dev,
209                                 "Error in writing reg 0x%02x error: %d\n",
210                                 gpedge_add[i], ret);
211         }
212
213         for (i = 0; i < ARRAY_SIZE(rc5t583->irq_en_reg); i++) {
214                 ret = rc5t583_write(rc5t583->dev, irq_en_add[i],
215                                         rc5t583->irq_en_reg[i]);
216                 if (ret < 0)
217                         dev_warn(rc5t583->dev,
218                                 "Error in writing reg 0x%02x error: %d\n",
219                                 irq_en_add[i], ret);
220         }
221
222         ret = rc5t583_write(rc5t583->dev, RC5T583_INTC_INTEN,
223                                 rc5t583->intc_inten_reg);
224         if (ret < 0)
225                 dev_warn(rc5t583->dev,
226                         "Error in writing reg 0x%02x error: %d\n",
227                         RC5T583_INTC_INTEN, ret);
228
229         mutex_unlock(&rc5t583->irq_lock);
230 }
231 #ifdef CONFIG_PM_SLEEP
232 static int rc5t583_irq_set_wake(struct irq_data *irq_data, unsigned int on)
233 {
234         struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
235         return irq_set_irq_wake(rc5t583->chip_irq, on);
236 }
237 #else
238 #define rc5t583_irq_set_wake NULL
239 #endif
240
241 static irqreturn_t rc5t583_irq(int irq, void *data)
242 {
243         struct rc5t583 *rc5t583 = data;
244         uint8_t int_sts[RC5T583_MAX_INTERRUPT_MASK_REGS];
245         uint8_t master_int = 0;
246         int i;
247         int ret;
248         unsigned int rtc_int_sts = 0;
249
250         /* Clear the status */
251         for (i = 0; i < RC5T583_MAX_INTERRUPT_MASK_REGS; i++)
252                 int_sts[i] = 0;
253
254         ret  = rc5t583_read(rc5t583->dev, RC5T583_INTC_INTMON, &master_int);
255         if (ret < 0) {
256                 dev_err(rc5t583->dev,
257                         "Error in reading reg 0x%02x error: %d\n",
258                         RC5T583_INTC_INTMON, ret);
259                 return IRQ_HANDLED;
260         }
261
262         for (i = 0; i < RC5T583_MAX_INTERRUPT_MASK_REGS; ++i) {
263                 if (!(master_int & main_int_type[i]))
264                         continue;
265
266                 ret = rc5t583_read(rc5t583->dev, irq_mon_add[i], &int_sts[i]);
267                 if (ret < 0) {
268                         dev_warn(rc5t583->dev,
269                                 "Error in reading reg 0x%02x error: %d\n",
270                                 irq_mon_add[i], ret);
271                         int_sts[i] = 0;
272                         continue;
273                 }
274
275                 if (main_int_type[i] & RTC_INT) {
276                         rtc_int_sts = 0;
277                         if (int_sts[i] & 0x1)
278                                 rtc_int_sts |= BIT(6);
279                         if (int_sts[i] & 0x2)
280                                 rtc_int_sts |= BIT(7);
281                         if (int_sts[i] & 0x4)
282                                 rtc_int_sts |= BIT(0);
283                         if (int_sts[i] & 0x8)
284                                 rtc_int_sts |= BIT(5);
285                 }
286
287                 ret = rc5t583_write(rc5t583->dev, irq_clr_add[i],
288                                 ~int_sts[i]);
289                 if (ret < 0)
290                         dev_warn(rc5t583->dev,
291                                 "Error in reading reg 0x%02x error: %d\n",
292                                 irq_clr_add[i], ret);
293
294                 if (main_int_type[i] & RTC_INT)
295                         int_sts[i] = rtc_int_sts;
296         }
297
298         /* Merge gpio interrupts for rising and falling case*/
299         int_sts[7] |= int_sts[8];
300
301         /* Call interrupt handler if enabled */
302         for (i = 0; i < RC5T583_MAX_IRQS; ++i) {
303                 const struct rc5t583_irq_data *data = &rc5t583_irqs[i];
304                 if ((int_sts[data->mask_reg_index] & (1 << data->int_en_bit)) &&
305                         (rc5t583->group_irq_en[data->master_bit] &
306                                         (1 << data->grp_index)))
307                         handle_nested_irq(rc5t583->irq_base + i);
308         }
309
310         return IRQ_HANDLED;
311 }
312
313 static struct irq_chip rc5t583_irq_chip = {
314         .name = "rc5t583-irq",
315         .irq_mask = rc5t583_irq_mask,
316         .irq_unmask = rc5t583_irq_unmask,
317         .irq_bus_lock = rc5t583_irq_lock,
318         .irq_bus_sync_unlock = rc5t583_irq_sync_unlock,
319         .irq_set_type = rc5t583_irq_set_type,
320         .irq_set_wake = rc5t583_irq_set_wake,
321 };
322
323 int rc5t583_irq_init(struct rc5t583 *rc5t583, int irq, int irq_base)
324 {
325         int i, ret;
326
327         if (!irq_base) {
328                 dev_warn(rc5t583->dev, "No interrupt support on IRQ base\n");
329                 return -EINVAL;
330         }
331
332         mutex_init(&rc5t583->irq_lock);
333
334         /* Initailize all int register to 0 */
335         for (i = 0; i < RC5T583_MAX_INTERRUPT_EN_REGS; i++)  {
336                 ret = rc5t583_write(rc5t583->dev, irq_en_add[i],
337                                 rc5t583->irq_en_reg[i]);
338                 if (ret < 0)
339                         dev_warn(rc5t583->dev,
340                                 "Error in writing reg 0x%02x error: %d\n",
341                                 irq_en_add[i], ret);
342         }
343
344         for (i = 0; i < RC5T583_MAX_GPEDGE_REG; i++)  {
345                 ret = rc5t583_write(rc5t583->dev, gpedge_add[i],
346                                 rc5t583->gpedge_reg[i]);
347                 if (ret < 0)
348                         dev_warn(rc5t583->dev,
349                                 "Error in writing reg 0x%02x error: %d\n",
350                                 gpedge_add[i], ret);
351         }
352
353         ret = rc5t583_write(rc5t583->dev, RC5T583_INTC_INTEN, 0x0);
354         if (ret < 0)
355                 dev_warn(rc5t583->dev,
356                         "Error in writing reg 0x%02x error: %d\n",
357                         RC5T583_INTC_INTEN, ret);
358
359         /* Clear all interrupts in case they woke up active. */
360         for (i = 0; i < RC5T583_MAX_INTERRUPT_MASK_REGS; i++)  {
361                 ret = rc5t583_write(rc5t583->dev, irq_clr_add[i], 0);
362                 if (ret < 0)
363                         dev_warn(rc5t583->dev,
364                                 "Error in writing reg 0x%02x error: %d\n",
365                                 irq_clr_add[i], ret);
366         }
367
368         rc5t583->irq_base = irq_base;
369         rc5t583->chip_irq = irq;
370
371         for (i = 0; i < RC5T583_MAX_IRQS; i++) {
372                 int __irq = i + rc5t583->irq_base;
373                 irq_set_chip_data(__irq, rc5t583);
374                 irq_set_chip_and_handler(__irq, &rc5t583_irq_chip,
375                                          handle_simple_irq);
376                 irq_set_nested_thread(__irq, 1);
377                 irq_clear_status_flags(__irq, IRQ_NOREQUEST);
378         }
379
380         ret = devm_request_threaded_irq(rc5t583->dev, irq, NULL, rc5t583_irq,
381                                         IRQF_ONESHOT, "rc5t583", rc5t583);
382         if (ret < 0)
383                 dev_err(rc5t583->dev,
384                         "Error in registering interrupt error: %d\n", ret);
385         return ret;
386 }