drivers/mfd/twl6030-irq.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * twl6030-irq.c - TWL6030 irq support
   4  *
   5  * Copyright (C) 2005-2009 Texas Instruments, Inc.
   6  *
   7  * Modifications to defer interrupt handling to a kernel thread:
   8  * Copyright (C) 2006 MontaVista Software, Inc.
   9  *
  10  * Based on tlv320aic23.c:
  11  * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
  12  *
  13  * Code cleanup and modifications to IRQ handler.
  14  * by syed khasim <x0khasim@ti.com>
  15  *
  16  * TWL6030 specific code and IRQ handling changes by
  17  * Jagadeesh Bhaskar Pakaravoor <j-pakaravoor@ti.com>
  18  * Balaji T K <balajitk@ti.com>
  19  */
  20
  21 #include <linux/export.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/irq.h>
  24 #include <linux/kthread.h>
  25 #include <linux/mfd/twl.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/suspend.h>
  28 #include <linux/of.h>
  29 #include <linux/irqdomain.h>
  30 #include <linux/of_device.h>
  31
  32 #include "twl-core.h"
  33
  34 /*
  35  * TWL6030 (unlike its predecessors, which had two level interrupt handling)
  36  * three interrupt registers INT_STS_A, INT_STS_B and INT_STS_C.
  37  * It exposes status bits saying who has raised an interrupt. There are
  38  * three mask registers that corresponds to these status registers, that
  39  * enables/disables these interrupts.
  40  *
  41  * We set up IRQs starting at a platform-specified base. An interrupt map table,
  42  * specifies mapping between interrupt number and the associated module.
  43  */
  44 #define TWL6030_NR_IRQS    20
  45
  46 static int twl6030_interrupt_mapping[24] = {
  47         PWR_INTR_OFFSET,        /* Bit 0        PWRON                   */
  48         PWR_INTR_OFFSET,        /* Bit 1        RPWRON                  */
  49         PWR_INTR_OFFSET,        /* Bit 2        BAT_VLOW                */
  50         RTC_INTR_OFFSET,        /* Bit 3        RTC_ALARM               */
  51         RTC_INTR_OFFSET,        /* Bit 4        RTC_PERIOD              */
  52         HOTDIE_INTR_OFFSET,     /* Bit 5        HOT_DIE                 */
  53         SMPSLDO_INTR_OFFSET,    /* Bit 6        VXXX_SHORT              */
  54         SMPSLDO_INTR_OFFSET,    /* Bit 7        VMMC_SHORT              */
  55
  56         SMPSLDO_INTR_OFFSET,    /* Bit 8        VUSIM_SHORT             */
  57         BATDETECT_INTR_OFFSET,  /* Bit 9        BAT                     */
  58         SIMDETECT_INTR_OFFSET,  /* Bit 10       SIM                     */
  59         MMCDETECT_INTR_OFFSET,  /* Bit 11       MMC                     */
  60         RSV_INTR_OFFSET,        /* Bit 12       Reserved                */
  61         MADC_INTR_OFFSET,       /* Bit 13       GPADC_RT_EOC            */
  62         MADC_INTR_OFFSET,       /* Bit 14       GPADC_SW_EOC            */
  63         GASGAUGE_INTR_OFFSET,   /* Bit 15       CC_AUTOCAL              */
  64
  65         USBOTG_INTR_OFFSET,     /* Bit 16       ID_WKUP                 */
  66         USBOTG_INTR_OFFSET,     /* Bit 17       VBUS_WKUP               */
  67         USBOTG_INTR_OFFSET,     /* Bit 18       ID                      */
  68         USB_PRES_INTR_OFFSET,   /* Bit 19       VBUS                    */
  69         CHARGER_INTR_OFFSET,    /* Bit 20       CHRG_CTRL               */
  70         CHARGERFAULT_INTR_OFFSET,       /* Bit 21       EXT_CHRG        */
  71         CHARGERFAULT_INTR_OFFSET,       /* Bit 22       INT_CHRG        */
  72         RSV_INTR_OFFSET,        /* Bit 23       Reserved                */
  73 };
  74
  75 static int twl6032_interrupt_mapping[24] = {
  76         PWR_INTR_OFFSET,        /* Bit 0        PWRON                   */
  77         PWR_INTR_OFFSET,        /* Bit 1        RPWRON                  */
  78         PWR_INTR_OFFSET,        /* Bit 2        SYS_VLOW                */
  79         RTC_INTR_OFFSET,        /* Bit 3        RTC_ALARM               */
  80         RTC_INTR_OFFSET,        /* Bit 4        RTC_PERIOD              */
  81         HOTDIE_INTR_OFFSET,     /* Bit 5        HOT_DIE                 */
  82         SMPSLDO_INTR_OFFSET,    /* Bit 6        VXXX_SHORT              */
  83         PWR_INTR_OFFSET,        /* Bit 7        SPDURATION              */
  84
  85         PWR_INTR_OFFSET,        /* Bit 8        WATCHDOG                */
  86         BATDETECT_INTR_OFFSET,  /* Bit 9        BAT                     */
  87         SIMDETECT_INTR_OFFSET,  /* Bit 10       SIM                     */
  88         MMCDETECT_INTR_OFFSET,  /* Bit 11       MMC                     */
  89         MADC_INTR_OFFSET,       /* Bit 12       GPADC_RT_EOC            */
  90         MADC_INTR_OFFSET,       /* Bit 13       GPADC_SW_EOC            */
  91         GASGAUGE_INTR_OFFSET,   /* Bit 14       CC_EOC                  */
  92         GASGAUGE_INTR_OFFSET,   /* Bit 15       CC_AUTOCAL              */
  93
  94         USBOTG_INTR_OFFSET,     /* Bit 16       ID_WKUP                 */
  95         USBOTG_INTR_OFFSET,     /* Bit 17       VBUS_WKUP               */
  96         USBOTG_INTR_OFFSET,     /* Bit 18       ID                      */
  97         USB_PRES_INTR_OFFSET,   /* Bit 19       VBUS                    */
  98         CHARGER_INTR_OFFSET,    /* Bit 20       CHRG_CTRL               */
  99         CHARGERFAULT_INTR_OFFSET,       /* Bit 21       EXT_CHRG        */
 100         CHARGERFAULT_INTR_OFFSET,       /* Bit 22       INT_CHRG        */
 101         RSV_INTR_OFFSET,        /* Bit 23       Reserved                */
 102 };
 103
 104 /*----------------------------------------------------------------------*/
 105
 106 struct twl6030_irq {
 107         unsigned int            irq_base;
 108         int                     twl_irq;
 109         bool                    irq_wake_enabled;
 110         atomic_t                wakeirqs;
 111         struct notifier_block   pm_nb;
 112         struct irq_chip         irq_chip;
 113         struct irq_domain       *irq_domain;
 114         const int               *irq_mapping_tbl;
 115 };
 116
 117 static struct twl6030_irq *twl6030_irq;
 118
 119 static int twl6030_irq_pm_notifier(struct notifier_block *notifier,
 120                                    unsigned long pm_event, void *unused)
 121 {
 122         int chained_wakeups;
 123         struct twl6030_irq *pdata = container_of(notifier, struct twl6030_irq,
 124                                                   pm_nb);
 125
 126         switch (pm_event) {
 127         case PM_SUSPEND_PREPARE:
 128                 chained_wakeups = atomic_read(&pdata->wakeirqs);
 129
 130                 if (chained_wakeups && !pdata->irq_wake_enabled) {
 131                         if (enable_irq_wake(pdata->twl_irq))
 132                                 pr_err("twl6030 IRQ wake enable failed\n");
 133                         else
 134                                 pdata->irq_wake_enabled = true;
 135                 } else if (!chained_wakeups && pdata->irq_wake_enabled) {
 136                         disable_irq_wake(pdata->twl_irq);
 137                         pdata->irq_wake_enabled = false;
 138                 }
 139
 140                 disable_irq(pdata->twl_irq);
 141                 break;
 142
 143         case PM_POST_SUSPEND:
 144                 enable_irq(pdata->twl_irq);
 145                 break;
 146
 147         default:
 148                 break;
 149         }
 150
 151         return NOTIFY_DONE;
 152 }
 153
 154 /*
 155 * Threaded irq handler for the twl6030 interrupt.
 156 * We query the interrupt controller in the twl6030 to determine
 157 * which module is generating the interrupt request and call
 158 * handle_nested_irq for that module.
 159 */
 160 static irqreturn_t twl6030_irq_thread(int irq, void *data)
 161 {
 162         int i, ret;
 163         union {
 164                 u8 bytes[4];
 165                 __le32 int_sts;
 166         } sts;
 167         u32 int_sts; /* sts.int_sts converted to CPU endianness */
 168         struct twl6030_irq *pdata = data;
 169
 170         /* read INT_STS_A, B and C in one shot using a burst read */
 171         ret = twl_i2c_read(TWL_MODULE_PIH, sts.bytes, REG_INT_STS_A, 3);
 172         if (ret) {
 173                 pr_warn("twl6030_irq: I2C error %d reading PIH ISR\n", ret);
 174                 return IRQ_HANDLED;
 175         }
 176
 177         sts.bytes[3] = 0; /* Only 24 bits are valid*/
 178
 179         /*
 180          * Since VBUS status bit is not reliable for VBUS disconnect
 181          * use CHARGER VBUS detection status bit instead.
 182          */
 183         if (sts.bytes[2] & 0x10)
 184                 sts.bytes[2] |= 0x08;
 185
 186         int_sts = le32_to_cpu(sts.int_sts);
 187         for (i = 0; int_sts; int_sts >>= 1, i++)
 188                 if (int_sts & 0x1) {
 189                         int module_irq =
 190                                 irq_find_mapping(pdata->irq_domain,
 191                                                  pdata->irq_mapping_tbl[i]);
 192                         if (module_irq)
 193                                 handle_nested_irq(module_irq);
 194                         else
 195                                 pr_err("twl6030_irq: Unmapped PIH ISR %u detected\n",
 196                                        i);
 197                         pr_debug("twl6030_irq: PIH ISR %u, virq%u\n",
 198                                  i, module_irq);
 199                 }
 200
 201         /*
 202          * NOTE:
 203          * Simulation confirms that documentation is wrong w.r.t the
 204          * interrupt status clear operation. A single *byte* write to
 205          * any one of STS_A to STS_C register results in all three
 206          * STS registers being reset. Since it does not matter which
 207          * value is written, all three registers are cleared on a
 208          * single byte write, so we just use 0x0 to clear.
 209          */
 210         ret = twl_i2c_write_u8(TWL_MODULE_PIH, 0x00, REG_INT_STS_A);
 211         if (ret)
 212                 pr_warn("twl6030_irq: I2C error in clearing PIH ISR\n");
 213
 214         return IRQ_HANDLED;
 215 }
 216
 217 /*----------------------------------------------------------------------*/
 218
 219 static int twl6030_irq_set_wake(struct irq_data *d, unsigned int on)
 220 {
 221         struct twl6030_irq *pdata = irq_data_get_irq_chip_data(d);
 222
 223         if (on)
 224                 atomic_inc(&pdata->wakeirqs);
 225         else
 226                 atomic_dec(&pdata->wakeirqs);
 227
 228         return 0;
 229 }
 230
 231 int twl6030_interrupt_unmask(u8 bit_mask, u8 offset)
 232 {
 233         int ret;
 234         u8 unmask_value;
 235
 236         ret = twl_i2c_read_u8(TWL_MODULE_PIH, &unmask_value,
 237                         REG_INT_STS_A + offset);
 238         unmask_value &= (~(bit_mask));
 239         ret |= twl_i2c_write_u8(TWL_MODULE_PIH, unmask_value,
 240                         REG_INT_STS_A + offset); /* unmask INT_MSK_A/B/C */
 241         return ret;
 242 }
 243 EXPORT_SYMBOL(twl6030_interrupt_unmask);
 244
 245 int twl6030_interrupt_mask(u8 bit_mask, u8 offset)
 246 {
 247         int ret;
 248         u8 mask_value;
 249
 250         ret = twl_i2c_read_u8(TWL_MODULE_PIH, &mask_value,
 251                         REG_INT_STS_A + offset);
 252         mask_value |= (bit_mask);
 253         ret |= twl_i2c_write_u8(TWL_MODULE_PIH, mask_value,
 254                         REG_INT_STS_A + offset); /* mask INT_MSK_A/B/C */
 255         return ret;
 256 }
 257 EXPORT_SYMBOL(twl6030_interrupt_mask);
 258
 259 int twl6030_mmc_card_detect_config(void)
 260 {
 261         int ret;
 262         u8 reg_val = 0;
 263
 264         /* Unmasking the Card detect Interrupt line for MMC1 from Phoenix */
 265         twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
 266                                                 REG_INT_MSK_LINE_B);
 267         twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
 268                                                 REG_INT_MSK_STS_B);
 269         /*
 270          * Initially Configuring MMC_CTRL for receiving interrupts &
 271          * Card status on TWL6030 for MMC1
 272          */
 273         ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &reg_val, TWL6030_MMCCTRL);
 274         if (ret < 0) {
 275                 pr_err("twl6030: Failed to read MMCCTRL, error %d\n", ret);
 276                 return ret;
 277         }
 278         reg_val &= ~VMMC_AUTO_OFF;
 279         reg_val |= SW_FC;
 280         ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val, TWL6030_MMCCTRL);
 281         if (ret < 0) {
 282                 pr_err("twl6030: Failed to write MMCCTRL, error %d\n", ret);
 283                 return ret;
 284         }
 285
 286         /* Configuring PullUp-PullDown register */
 287         ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &reg_val,
 288                                                 TWL6030_CFG_INPUT_PUPD3);
 289         if (ret < 0) {
 290                 pr_err("twl6030: Failed to read CFG_INPUT_PUPD3, error %d\n",
 291                                                                         ret);
 292                 return ret;
 293         }
 294         reg_val &= ~(MMC_PU | MMC_PD);
 295         ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val,
 296                                                 TWL6030_CFG_INPUT_PUPD3);
 297         if (ret < 0) {
 298                 pr_err("twl6030: Failed to write CFG_INPUT_PUPD3, error %d\n",
 299                                                                         ret);
 300                 return ret;
 301         }
 302
 303         return irq_find_mapping(twl6030_irq->irq_domain,
 304                                  MMCDETECT_INTR_OFFSET);
 305 }
 306 EXPORT_SYMBOL(twl6030_mmc_card_detect_config);
 307
 308 int twl6030_mmc_card_detect(struct device *dev, int slot)
 309 {
 310         int ret = -EIO;
 311         u8 read_reg = 0;
 312         struct platform_device *pdev = to_platform_device(dev);
 313
 314         if (pdev->id) {
 315                 /* TWL6030 provide's Card detect support for
 316                  * only MMC1 controller.
 317                  */
 318                 pr_err("Unknown MMC controller %d in %s\n", pdev->id, __func__);
 319                 return ret;
 320         }
 321         /*
 322          * BIT0 of MMC_CTRL on TWL6030 provides card status for MMC1
 323          * 0 - Card not present ,1 - Card present
 324          */
 325         ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &read_reg,
 326                                                 TWL6030_MMCCTRL);
 327         if (ret >= 0)
 328                 ret = read_reg & STS_MMC;
 329         return ret;
 330 }
 331 EXPORT_SYMBOL(twl6030_mmc_card_detect);
 332
 333 static int twl6030_irq_map(struct irq_domain *d, unsigned int virq,
 334                               irq_hw_number_t hwirq)
 335 {
 336         struct twl6030_irq *pdata = d->host_data;
 337
 338         irq_set_chip_data(virq, pdata);
 339         irq_set_chip_and_handler(virq,  &pdata->irq_chip, handle_simple_irq);
 340         irq_set_nested_thread(virq, true);
 341         irq_set_parent(virq, pdata->twl_irq);
 342         irq_set_noprobe(virq);
 343
 344         return 0;
 345 }
 346
 347 static void twl6030_irq_unmap(struct irq_domain *d, unsigned int virq)
 348 {
 349         irq_set_chip_and_handler(virq, NULL, NULL);
 350         irq_set_chip_data(virq, NULL);
 351 }
 352
 353 static const struct irq_domain_ops twl6030_irq_domain_ops = {
 354         .map    = twl6030_irq_map,
 355         .unmap  = twl6030_irq_unmap,
 356         .xlate  = irq_domain_xlate_onetwocell,
 357 };
 358
 359 static const struct of_device_id twl6030_of_match[] = {
 360         {.compatible = "ti,twl6030", &twl6030_interrupt_mapping},
 361         {.compatible = "ti,twl6032", &twl6032_interrupt_mapping},
 362         { },
 363 };
 364
 365 int twl6030_init_irq(struct device *dev, int irq_num)
 366 {
 367         struct                  device_node *node = dev->of_node;
 368         int                     nr_irqs;
 369         int                     status;
 370         u8                      mask[3];
 371         const struct of_device_id *of_id;
 372
 373         of_id = of_match_device(twl6030_of_match, dev);
 374         if (!of_id || !of_id->data) {
 375                 dev_err(dev, "Unknown TWL device model\n");
 376                 return -EINVAL;
 377         }
 378
 379         nr_irqs = TWL6030_NR_IRQS;
 380
 381         twl6030_irq = devm_kzalloc(dev, sizeof(*twl6030_irq), GFP_KERNEL);
 382         if (!twl6030_irq)
 383                 return -ENOMEM;
 384
 385         mask[0] = 0xFF;
 386         mask[1] = 0xFF;
 387         mask[2] = 0xFF;
 388
 389         /* mask all int lines */
 390         status = twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_LINE_A, 3);
 391         /* mask all int sts */
 392         status |= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_STS_A, 3);
 393         /* clear INT_STS_A,B,C */
 394         status |= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_STS_A, 3);
 395
 396         if (status < 0) {
 397                 dev_err(dev, "I2C err writing TWL_MODULE_PIH: %d\n", status);
 398                 return status;
 399         }
 400
 401         /*
 402          * install an irq handler for each of the modules;
 403          * clone dummy irq_chip since PIH can't *do* anything
 404          */
 405         twl6030_irq->irq_chip = dummy_irq_chip;
 406         twl6030_irq->irq_chip.name = "twl6030";
 407         twl6030_irq->irq_chip.irq_set_type = NULL;
 408         twl6030_irq->irq_chip.irq_set_wake = twl6030_irq_set_wake;
 409
 410         twl6030_irq->pm_nb.notifier_call = twl6030_irq_pm_notifier;
 411         atomic_set(&twl6030_irq->wakeirqs, 0);
 412         twl6030_irq->irq_mapping_tbl = of_id->data;
 413
 414         twl6030_irq->irq_domain =
 415                 irq_domain_add_linear(node, nr_irqs,
 416                                       &twl6030_irq_domain_ops, twl6030_irq);
 417         if (!twl6030_irq->irq_domain) {
 418                 dev_err(dev, "Can't add irq_domain\n");
 419                 return -ENOMEM;
 420         }
 421
 422         dev_info(dev, "PIH (irq %d) nested IRQs\n", irq_num);
 423
 424         /* install an irq handler to demultiplex the TWL6030 interrupt */
 425         status = request_threaded_irq(irq_num, NULL, twl6030_irq_thread,
 426                                       IRQF_ONESHOT, "TWL6030-PIH", twl6030_irq);
 427         if (status < 0) {
 428                 dev_err(dev, "could not claim irq %d: %d\n", irq_num, status);
 429                 goto fail_irq;
 430         }
 431
 432         twl6030_irq->twl_irq = irq_num;
 433         register_pm_notifier(&twl6030_irq->pm_nb);
 434         return 0;
 435
 436 fail_irq:
 437         irq_domain_remove(twl6030_irq->irq_domain);
 438         return status;
 439 }
 440
 441 int twl6030_exit_irq(void)
 442 {
 443         if (twl6030_irq && twl6030_irq->twl_irq) {
 444                 unregister_pm_notifier(&twl6030_irq->pm_nb);
 445                 free_irq(twl6030_irq->twl_irq, NULL);
 446                 /*
 447                  * TODO: IRQ domain and allocated nested IRQ descriptors
 448                  * should be freed somehow here. Now It can't be done, because
 449                  * child devices will not be deleted during removing of
 450                  * TWL Core driver and they will still contain allocated
 451                  * virt IRQs in their Resources tables.
 452                  * The same prevents us from using devm_request_threaded_irq()
 453                  * in this module.
 454                  */
 455         }
 456         return 0;
 457 }
 458