drivers/mfd/rc5t583-irq.c

   1 /*
   2  * Interrupt driver for RICOH583 power management chip.
   3  *
   4  * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
   5  * Author: Laxman dewangan <ldewangan@nvidia.com>
   6  *
   7  * based on code
   8  *      Copyright (C) 2011 RICOH COMPANY,LTD
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms and conditions of the GNU General Public License,
  12  * version 2, as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  *
  22  */
  23 #include <linux/interrupt.h>
  24 #include <linux/irq.h>
  25 #include <linux/init.h>
  26 #include <linux/i2c.h>
  27 #include <linux/mfd/rc5t583.h>
  28
  29 enum int_type {
  30         SYS_INT  = 0x1,
  31         DCDC_INT = 0x2,
  32         RTC_INT  = 0x4,
  33         ADC_INT  = 0x8,
  34         GPIO_INT = 0x10,
  35 };
  36
  37 static int gpedge_add[] = {
  38         RC5T583_GPIO_GPEDGE2,
  39         RC5T583_GPIO_GPEDGE2
  40 };
  41
  42 static int irq_en_add[] = {
  43         RC5T583_INT_EN_SYS1,
  44         RC5T583_INT_EN_SYS2,
  45         RC5T583_INT_EN_DCDC,
  46         RC5T583_INT_EN_RTC,
  47         RC5T583_INT_EN_ADC1,
  48         RC5T583_INT_EN_ADC2,
  49         RC5T583_INT_EN_ADC3,
  50         RC5T583_GPIO_EN_INT
  51 };
  52
  53 static int irq_mon_add[] = {
  54         RC5T583_INT_MON_SYS1,
  55         RC5T583_INT_MON_SYS2,
  56         RC5T583_INT_MON_DCDC,
  57         RC5T583_INT_MON_RTC,
  58         RC5T583_INT_IR_ADCL,
  59         RC5T583_INT_IR_ADCH,
  60         RC5T583_INT_IR_ADCEND,
  61         RC5T583_INT_IR_GPIOF,
  62         RC5T583_INT_IR_GPIOR
  63 };
  64
  65 static int irq_clr_add[] = {
  66         RC5T583_INT_IR_SYS1,
  67         RC5T583_INT_IR_SYS2,
  68         RC5T583_INT_IR_DCDC,
  69         RC5T583_INT_IR_RTC,
  70         RC5T583_INT_IR_ADCL,
  71         RC5T583_INT_IR_ADCH,
  72         RC5T583_INT_IR_ADCEND,
  73         RC5T583_INT_IR_GPIOF,
  74         RC5T583_INT_IR_GPIOR
  75 };
  76
  77 static int main_int_type[] = {
  78         SYS_INT,
  79         SYS_INT,
  80         DCDC_INT,
  81         RTC_INT,
  82         ADC_INT,
  83         ADC_INT,
  84         ADC_INT,
  85         GPIO_INT,
  86         GPIO_INT,
  87 };
  88
  89 struct rc5t583_irq_data {
  90         u8      int_type;
  91         u8      master_bit;
  92         u8      int_en_bit;
  93         u8      mask_reg_index;
  94         int     grp_index;
  95 };
  96
  97 #define RC5T583_IRQ(_int_type, _master_bit, _grp_index, \
  98                         _int_bit, _mask_ind)            \
  99         {                                               \
 100                 .int_type       = _int_type,            \
 101                 .master_bit     = _master_bit,          \
 102                 .grp_index      = _grp_index,           \
 103                 .int_en_bit     = _int_bit,             \
 104                 .mask_reg_index = _mask_ind,            \
 105         }
 106
 107 static const struct rc5t583_irq_data rc5t583_irqs[RC5T583_MAX_IRQS] = {
 108         [RC5T583_IRQ_ONKEY]             = RC5T583_IRQ(SYS_INT,  0, 0, 0, 0),
 109         [RC5T583_IRQ_ACOK]              = RC5T583_IRQ(SYS_INT,  0, 1, 1, 0),
 110         [RC5T583_IRQ_LIDOPEN]           = RC5T583_IRQ(SYS_INT,  0, 2, 2, 0),
 111         [RC5T583_IRQ_PREOT]             = RC5T583_IRQ(SYS_INT,  0, 3, 3, 0),
 112         [RC5T583_IRQ_CLKSTP]            = RC5T583_IRQ(SYS_INT,  0, 4, 4, 0),
 113         [RC5T583_IRQ_ONKEY_OFF]         = RC5T583_IRQ(SYS_INT,  0, 5, 5, 0),
 114         [RC5T583_IRQ_WD]                = RC5T583_IRQ(SYS_INT,  0, 7, 7, 0),
 115         [RC5T583_IRQ_EN_PWRREQ1]        = RC5T583_IRQ(SYS_INT,  0, 8, 0, 1),
 116         [RC5T583_IRQ_EN_PWRREQ2]        = RC5T583_IRQ(SYS_INT,  0, 9, 1, 1),
 117         [RC5T583_IRQ_PRE_VINDET]        = RC5T583_IRQ(SYS_INT,  0, 10, 2, 1),
 118
 119         [RC5T583_IRQ_DC0LIM]            = RC5T583_IRQ(DCDC_INT, 1, 0, 0, 2),
 120         [RC5T583_IRQ_DC1LIM]            = RC5T583_IRQ(DCDC_INT, 1, 1, 1, 2),
 121         [RC5T583_IRQ_DC2LIM]            = RC5T583_IRQ(DCDC_INT, 1, 2, 2, 2),
 122         [RC5T583_IRQ_DC3LIM]            = RC5T583_IRQ(DCDC_INT, 1, 3, 3, 2),
 123
 124         [RC5T583_IRQ_CTC]               = RC5T583_IRQ(RTC_INT,  2, 0, 0, 3),
 125         [RC5T583_IRQ_YALE]              = RC5T583_IRQ(RTC_INT,  2, 5, 5, 3),
 126         [RC5T583_IRQ_DALE]              = RC5T583_IRQ(RTC_INT,  2, 6, 6, 3),
 127         [RC5T583_IRQ_WALE]              = RC5T583_IRQ(RTC_INT,  2, 7, 7, 3),
 128
 129         [RC5T583_IRQ_AIN1L]             = RC5T583_IRQ(ADC_INT,  3, 0, 0, 4),
 130         [RC5T583_IRQ_AIN2L]             = RC5T583_IRQ(ADC_INT,  3, 1, 1, 4),
 131         [RC5T583_IRQ_AIN3L]             = RC5T583_IRQ(ADC_INT,  3, 2, 2, 4),
 132         [RC5T583_IRQ_VBATL]             = RC5T583_IRQ(ADC_INT,  3, 3, 3, 4),
 133         [RC5T583_IRQ_VIN3L]             = RC5T583_IRQ(ADC_INT,  3, 4, 4, 4),
 134         [RC5T583_IRQ_VIN8L]             = RC5T583_IRQ(ADC_INT,  3, 5, 5, 4),
 135         [RC5T583_IRQ_AIN1H]             = RC5T583_IRQ(ADC_INT,  3, 6, 0, 5),
 136         [RC5T583_IRQ_AIN2H]             = RC5T583_IRQ(ADC_INT,  3, 7, 1, 5),
 137         [RC5T583_IRQ_AIN3H]             = RC5T583_IRQ(ADC_INT,  3, 8, 2, 5),
 138         [RC5T583_IRQ_VBATH]             = RC5T583_IRQ(ADC_INT,  3, 9, 3, 5),
 139         [RC5T583_IRQ_VIN3H]             = RC5T583_IRQ(ADC_INT,  3, 10, 4, 5),
 140         [RC5T583_IRQ_VIN8H]             = RC5T583_IRQ(ADC_INT,  3, 11, 5, 5),
 141         [RC5T583_IRQ_ADCEND]            = RC5T583_IRQ(ADC_INT,  3, 12, 0, 6),
 142
 143         [RC5T583_IRQ_GPIO0]             = RC5T583_IRQ(GPIO_INT, 4, 0, 0, 7),
 144         [RC5T583_IRQ_GPIO1]             = RC5T583_IRQ(GPIO_INT, 4, 1, 1, 7),
 145         [RC5T583_IRQ_GPIO2]             = RC5T583_IRQ(GPIO_INT, 4, 2, 2, 7),
 146         [RC5T583_IRQ_GPIO3]             = RC5T583_IRQ(GPIO_INT, 4, 3, 3, 7),
 147         [RC5T583_IRQ_GPIO4]             = RC5T583_IRQ(GPIO_INT, 4, 4, 4, 7),
 148         [RC5T583_IRQ_GPIO5]             = RC5T583_IRQ(GPIO_INT, 4, 5, 5, 7),
 149         [RC5T583_IRQ_GPIO6]             = RC5T583_IRQ(GPIO_INT, 4, 6, 6, 7),
 150         [RC5T583_IRQ_GPIO7]             = RC5T583_IRQ(GPIO_INT, 4, 7, 7, 7),
 151 };
 152
 153 static void rc5t583_irq_lock(struct irq_data *irq_data)
 154 {
 155         struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
 156         mutex_lock(&rc5t583->irq_lock);
 157 }
 158
 159 static void rc5t583_irq_unmask(struct irq_data *irq_data)
 160 {
 161         struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
 162         unsigned int __irq = irq_data->irq - rc5t583->irq_base;
 163         const struct rc5t583_irq_data *data = &rc5t583_irqs[__irq];
 164
 165         rc5t583->group_irq_en[data->grp_index] |= 1 << data->grp_index;
 166         rc5t583->intc_inten_reg |= 1 << data->master_bit;
 167         rc5t583->irq_en_reg[data->mask_reg_index] |= 1 << data->int_en_bit;
 168 }
 169
 170 static void rc5t583_irq_mask(struct irq_data *irq_data)
 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
 176         rc5t583->group_irq_en[data->grp_index] &= ~(1 << data->grp_index);
 177         if (!rc5t583->group_irq_en[data->grp_index])
 178                 rc5t583->intc_inten_reg &= ~(1 << data->master_bit);
 179
 180         rc5t583->irq_en_reg[data->mask_reg_index] &= ~(1 << data->int_en_bit);
 181 }
 182
 183 static int rc5t583_irq_set_type(struct irq_data *irq_data, unsigned int type)
 184 {
 185         struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
 186         unsigned int __irq = irq_data->irq - rc5t583->irq_base;
 187         const struct rc5t583_irq_data *data = &rc5t583_irqs[__irq];
 188         int val = 0;
 189         int gpedge_index;
 190         int gpedge_bit_pos;
 191
 192         /* Supporting only trigger level inetrrupt */
 193         if ((data->int_type & GPIO_INT) && (type & IRQ_TYPE_EDGE_BOTH)) {
 194                 gpedge_index = data->int_en_bit / 4;
 195                 gpedge_bit_pos = data->int_en_bit % 4;
 196
 197                 if (type & IRQ_TYPE_EDGE_FALLING)
 198                         val |= 0x2;
 199
 200                 if (type & IRQ_TYPE_EDGE_RISING)
 201                         val |= 0x1;
 202
 203                 rc5t583->gpedge_reg[gpedge_index] &= ~(3 << gpedge_bit_pos);
 204                 rc5t583->gpedge_reg[gpedge_index] |= (val << gpedge_bit_pos);
 205                 rc5t583_irq_unmask(irq_data);
 206                 return 0;
 207         }
 208         return -EINVAL;
 209 }
 210
 211 static void rc5t583_irq_sync_unlock(struct irq_data *irq_data)
 212 {
 213         struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
 214         int i;
 215         int ret;
 216
 217         for (i = 0; i < ARRAY_SIZE(rc5t583->gpedge_reg); i++) {
 218                 ret = rc5t583_write(rc5t583->dev, gpedge_add[i],
 219                                 rc5t583->gpedge_reg[i]);
 220                 if (ret < 0)
 221                         dev_warn(rc5t583->dev,
 222                                 "Error in writing reg 0x%02x error: %d\n",
 223                                 gpedge_add[i], ret);
 224         }
 225
 226         for (i = 0; i < ARRAY_SIZE(rc5t583->irq_en_reg); i++) {
 227                 ret = rc5t583_write(rc5t583->dev, irq_en_add[i],
 228                                         rc5t583->irq_en_reg[i]);
 229                 if (ret < 0)
 230                         dev_warn(rc5t583->dev,
 231                                 "Error in writing reg 0x%02x error: %d\n",
 232                                 irq_en_add[i], ret);
 233         }
 234
 235         ret = rc5t583_write(rc5t583->dev, RC5T583_INTC_INTEN,
 236                                 rc5t583->intc_inten_reg);
 237         if (ret < 0)
 238                 dev_warn(rc5t583->dev,
 239                         "Error in writing reg 0x%02x error: %d\n",
 240                         RC5T583_INTC_INTEN, ret);
 241
 242         mutex_unlock(&rc5t583->irq_lock);
 243 }
 244 #ifdef CONFIG_PM_SLEEP
 245 static int rc5t583_irq_set_wake(struct irq_data *irq_data, unsigned int on)
 246 {
 247         struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
 248         return irq_set_irq_wake(rc5t583->chip_irq, on);
 249 }
 250 #else
 251 #define rc5t583_irq_set_wake NULL
 252 #endif
 253
 254 static irqreturn_t rc5t583_irq(int irq, void *data)
 255 {
 256         struct rc5t583 *rc5t583 = data;
 257         uint8_t int_sts[RC5T583_MAX_INTERRUPT_MASK_REGS];
 258         uint8_t master_int = 0;
 259         int i;
 260         int ret;
 261         unsigned int rtc_int_sts = 0;
 262
 263         /* Clear the status */
 264         for (i = 0; i < RC5T583_MAX_INTERRUPT_MASK_REGS; i++)
 265                 int_sts[i] = 0;
 266
 267         ret  = rc5t583_read(rc5t583->dev, RC5T583_INTC_INTMON, &master_int);
 268         if (ret < 0) {
 269                 dev_err(rc5t583->dev,
 270                         "Error in reading reg 0x%02x error: %d\n",
 271                         RC5T583_INTC_INTMON, ret);
 272                 return IRQ_HANDLED;
 273         }
 274
 275         for (i = 0; i < RC5T583_MAX_INTERRUPT_MASK_REGS; ++i) {
 276                 if (!(master_int & main_int_type[i]))
 277                         continue;
 278
 279                 ret = rc5t583_read(rc5t583->dev, irq_mon_add[i], &int_sts[i]);
 280                 if (ret < 0) {
 281                         dev_warn(rc5t583->dev,
 282                                 "Error in reading reg 0x%02x error: %d\n",
 283                                 irq_mon_add[i], ret);
 284                         int_sts[i] = 0;
 285                         continue;
 286                 }
 287
 288                 if (main_int_type[i] & RTC_INT) {
 289                         rtc_int_sts = 0;
 290                         if (int_sts[i] & 0x1)
 291                                 rtc_int_sts |= BIT(6);
 292                         if (int_sts[i] & 0x2)
 293                                 rtc_int_sts |= BIT(7);
 294                         if (int_sts[i] & 0x4)
 295                                 rtc_int_sts |= BIT(0);
 296                         if (int_sts[i] & 0x8)
 297                                 rtc_int_sts |= BIT(5);
 298                 }
 299
 300                 ret = rc5t583_write(rc5t583->dev, irq_clr_add[i],
 301                                 ~int_sts[i]);
 302                 if (ret < 0)
 303                         dev_warn(rc5t583->dev,
 304                                 "Error in reading reg 0x%02x error: %d\n",
 305                                 irq_clr_add[i], ret);
 306
 307                 if (main_int_type[i] & RTC_INT)
 308                         int_sts[i] = rtc_int_sts;
 309         }
 310
 311         /* Merge gpio interrupts for rising and falling case*/
 312         int_sts[7] |= int_sts[8];
 313
 314         /* Call interrupt handler if enabled */
 315         for (i = 0; i < RC5T583_MAX_IRQS; ++i) {
 316                 const struct rc5t583_irq_data *data = &rc5t583_irqs[i];
 317                 if ((int_sts[data->mask_reg_index] & (1 << data->int_en_bit)) &&
 318                         (rc5t583->group_irq_en[data->master_bit] &
 319                                         (1 << data->grp_index)))
 320                         handle_nested_irq(rc5t583->irq_base + i);
 321         }
 322
 323         return IRQ_HANDLED;
 324 }
 325
 326 static struct irq_chip rc5t583_irq_chip = {
 327         .name = "rc5t583-irq",
 328         .irq_mask = rc5t583_irq_mask,
 329         .irq_unmask = rc5t583_irq_unmask,
 330         .irq_bus_lock = rc5t583_irq_lock,
 331         .irq_bus_sync_unlock = rc5t583_irq_sync_unlock,
 332         .irq_set_type = rc5t583_irq_set_type,
 333         .irq_set_wake = rc5t583_irq_set_wake,
 334 };
 335
 336 int rc5t583_irq_init(struct rc5t583 *rc5t583, int irq, int irq_base)
 337 {
 338         int i, ret;
 339
 340         if (!irq_base) {
 341                 dev_warn(rc5t583->dev, "No interrupt support on IRQ base\n");
 342                 return -EINVAL;
 343         }
 344
 345         mutex_init(&rc5t583->irq_lock);
 346
 347         /* Initailize all int register to 0 */
 348         for (i = 0; i < RC5T583_MAX_INTERRUPT_EN_REGS; i++)  {
 349                 ret = rc5t583_write(rc5t583->dev, irq_en_add[i],
 350                                 rc5t583->irq_en_reg[i]);
 351                 if (ret < 0)
 352                         dev_warn(rc5t583->dev,
 353                                 "Error in writing reg 0x%02x error: %d\n",
 354                                 irq_en_add[i], ret);
 355         }
 356
 357         for (i = 0; i < RC5T583_MAX_GPEDGE_REG; i++)  {
 358                 ret = rc5t583_write(rc5t583->dev, gpedge_add[i],
 359                                 rc5t583->gpedge_reg[i]);
 360                 if (ret < 0)
 361                         dev_warn(rc5t583->dev,
 362                                 "Error in writing reg 0x%02x error: %d\n",
 363                                 gpedge_add[i], ret);
 364         }
 365
 366         ret = rc5t583_write(rc5t583->dev, RC5T583_INTC_INTEN, 0x0);
 367         if (ret < 0)
 368                 dev_warn(rc5t583->dev,
 369                         "Error in writing reg 0x%02x error: %d\n",
 370                         RC5T583_INTC_INTEN, ret);
 371
 372         /* Clear all interrupts in case they woke up active. */
 373         for (i = 0; i < RC5T583_MAX_INTERRUPT_MASK_REGS; i++)  {
 374                 ret = rc5t583_write(rc5t583->dev, irq_clr_add[i], 0);
 375                 if (ret < 0)
 376                         dev_warn(rc5t583->dev,
 377                                 "Error in writing reg 0x%02x error: %d\n",
 378                                 irq_clr_add[i], ret);
 379         }
 380
 381         rc5t583->irq_base = irq_base;
 382         rc5t583->chip_irq = irq;
 383
 384         for (i = 0; i < RC5T583_MAX_IRQS; i++) {
 385                 int __irq = i + rc5t583->irq_base;
 386                 irq_set_chip_data(__irq, rc5t583);
 387                 irq_set_chip_and_handler(__irq, &rc5t583_irq_chip,
 388                                          handle_simple_irq);
 389                 irq_set_nested_thread(__irq, 1);
 390 #ifdef CONFIG_ARM
 391                 set_irq_flags(__irq, IRQF_VALID);
 392 #endif
 393         }
 394
 395         ret = request_threaded_irq(irq, NULL, rc5t583_irq, IRQF_ONESHOT,
 396                                 "rc5t583", rc5t583);
 397         if (ret < 0)
 398                 dev_err(rc5t583->dev,
 399                         "Error in registering interrupt error: %d\n", ret);
 400         return ret;
 401 }
 402
 403 int rc5t583_irq_exit(struct rc5t583 *rc5t583)
 404 {
 405         if (rc5t583->chip_irq)
 406                 free_irq(rc5t583->chip_irq, rc5t583);
 407         return 0;
 408 }