/* * wm831x-irq.c -- Interrupt controller support for Wolfson WM831x PMICs * * Copyright 2009 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/i2c.h> #include <linux/irq.h> #include <linux/mfd/core.h> #include <linux/interrupt.h> #include <linux/irqdomain.h> #include <linux/mfd/wm831x/core.h> #include <linux/mfd/wm831x/pdata.h> #include <linux/mfd/wm831x/gpio.h> #include <linux/mfd/wm831x/irq.h> #include <linux/delay.h> struct wm831x_irq_data { int primary; int reg; int mask; }; static struct wm831x_irq_data wm831x_irqs[] = { [WM831X_IRQ_TEMP_THW] = { .primary = WM831X_TEMP_INT, .reg = 1, .mask = WM831X_TEMP_THW_EINT, }, [WM831X_IRQ_GPIO_1] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP1_EINT, }, [WM831X_IRQ_GPIO_2] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP2_EINT, }, [WM831X_IRQ_GPIO_3] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP3_EINT, }, [WM831X_IRQ_GPIO_4] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP4_EINT, }, [WM831X_IRQ_GPIO_5] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP5_EINT, }, [WM831X_IRQ_GPIO_6] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP6_EINT, }, [WM831X_IRQ_GPIO_7] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP7_EINT, }, [WM831X_IRQ_GPIO_8] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP8_EINT, }, [WM831X_IRQ_GPIO_9] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP9_EINT, }, [WM831X_IRQ_GPIO_10] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP10_EINT, }, [WM831X_IRQ_GPIO_11] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP11_EINT, }, [WM831X_IRQ_GPIO_12] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP12_EINT, }, [WM831X_IRQ_GPIO_13] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP13_EINT, }, [WM831X_IRQ_GPIO_14] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP14_EINT, }, [WM831X_IRQ_GPIO_15] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP15_EINT, }, [WM831X_IRQ_GPIO_16] = { .primary = WM831X_GP_INT, .reg = 5, .mask = WM831X_GP16_EINT, }, [WM831X_IRQ_ON] = { .primary = WM831X_ON_PIN_INT, .reg = 1, .mask = WM831X_ON_PIN_EINT, }, [WM831X_IRQ_PPM_SYSLO] = { .primary = WM831X_PPM_INT, .reg = 1, .mask = WM831X_PPM_SYSLO_EINT, }, [WM831X_IRQ_PPM_PWR_SRC] = { .primary = WM831X_PPM_INT, .reg = 1, .mask = WM831X_PPM_PWR_SRC_EINT, }, [WM831X_IRQ_PPM_USB_CURR] = { .primary = WM831X_PPM_INT, .reg = 1, .mask = WM831X_PPM_USB_CURR_EINT, }, [WM831X_IRQ_WDOG_TO] = { .primary = WM831X_WDOG_INT, .reg = 1, .mask = WM831X_WDOG_TO_EINT, }, [WM831X_IRQ_RTC_PER] = { .primary = WM831X_RTC_INT, .reg = 1, .mask = WM831X_RTC_PER_EINT, }, [WM831X_IRQ_RTC_ALM] = { .primary = WM831X_RTC_INT, .reg = 1, .mask = WM831X_RTC_ALM_EINT, }, [WM831X_IRQ_CHG_BATT_HOT] = { .primary = WM831X_CHG_INT, .reg = 2, .mask = WM831X_CHG_BATT_HOT_EINT, }, [WM831X_IRQ_CHG_BATT_COLD] = { .primary = WM831X_CHG_INT, .reg = 2, .mask = WM831X_CHG_BATT_COLD_EINT, }, [WM831X_IRQ_CHG_BATT_FAIL] = { .primary = WM831X_CHG_INT, .reg = 2, .mask = WM831X_CHG_BATT_FAIL_EINT, }, [WM831X_IRQ_CHG_OV] = { .primary = WM831X_CHG_INT, .reg = 2, .mask = WM831X_CHG_OV_EINT, }, [WM831X_IRQ_CHG_END] = { .primary = WM831X_CHG_INT, .reg = 2, .mask = WM831X_CHG_END_EINT, }, [WM831X_IRQ_CHG_TO] = { .primary = WM831X_CHG_INT, .reg = 2, .mask = WM831X_CHG_TO_EINT, }, [WM831X_IRQ_CHG_MODE] = { .primary = WM831X_CHG_INT, .reg = 2, .mask = WM831X_CHG_MODE_EINT, }, [WM831X_IRQ_CHG_START] = { .primary = WM831X_CHG_INT, .reg = 2, .mask = WM831X_CHG_START_EINT, }, [WM831X_IRQ_TCHDATA] = { .primary = WM831X_TCHDATA_INT, .reg = 1, .mask = WM831X_TCHDATA_EINT, }, [WM831X_IRQ_TCHPD] = { .primary = WM831X_TCHPD_INT, .reg = 1, .mask = WM831X_TCHPD_EINT, }, [WM831X_IRQ_AUXADC_DATA] = { .primary = WM831X_AUXADC_INT, .reg = 1, .mask = WM831X_AUXADC_DATA_EINT, }, [WM831X_IRQ_AUXADC_DCOMP1] = { .primary = WM831X_AUXADC_INT, .reg = 1, .mask = WM831X_AUXADC_DCOMP1_EINT, }, [WM831X_IRQ_AUXADC_DCOMP2] = { .primary = WM831X_AUXADC_INT, .reg = 1, .mask = WM831X_AUXADC_DCOMP2_EINT, }, [WM831X_IRQ_AUXADC_DCOMP3] = { .primary = WM831X_AUXADC_INT, .reg = 1, .mask = WM831X_AUXADC_DCOMP3_EINT, }, [WM831X_IRQ_AUXADC_DCOMP4] = { .primary = WM831X_AUXADC_INT, .reg = 1, .mask = WM831X_AUXADC_DCOMP4_EINT, }, [WM831X_IRQ_CS1] = { .primary = WM831X_CS_INT, .reg = 2, .mask = WM831X_CS1_EINT, }, [WM831X_IRQ_CS2] = { .primary = WM831X_CS_INT, .reg = 2, .mask = WM831X_CS2_EINT, }, [WM831X_IRQ_HC_DC1] = { .primary = WM831X_HC_INT, .reg = 4, .mask = WM831X_HC_DC1_EINT, }, [WM831X_IRQ_HC_DC2] = { .primary = WM831X_HC_INT, .reg = 4, .mask = WM831X_HC_DC2_EINT, }, [WM831X_IRQ_UV_LDO1] = { .primary = WM831X_UV_INT, .reg = 3, .mask = WM831X_UV_LDO1_EINT, }, [WM831X_IRQ_UV_LDO2] = { .primary = WM831X_UV_INT, .reg = 3, .mask = WM831X_UV_LDO2_EINT, }, [WM831X_IRQ_UV_LDO3] = { .primary = WM831X_UV_INT, .reg = 3, .mask = WM831X_UV_LDO3_EINT, }, [WM831X_IRQ_UV_LDO4] = { .primary = WM831X_UV_INT, .reg = 3, .mask = WM831X_UV_LDO4_EINT, }, [WM831X_IRQ_UV_LDO5] = { .primary = WM831X_UV_INT, .reg = 3, .mask = WM831X_UV_LDO5_EINT, }, [WM831X_IRQ_UV_LDO6] = { .primary = WM831X_UV_INT, .reg = 3, .mask = WM831X_UV_LDO6_EINT, }, [WM831X_IRQ_UV_LDO7] = { .primary = WM831X_UV_INT, .reg = 3, .mask = WM831X_UV_LDO7_EINT, }, [WM831X_IRQ_UV_LDO8] = { .primary = WM831X_UV_INT, .reg = 3, .mask = WM831X_UV_LDO8_EINT, }, [WM831X_IRQ_UV_LDO9] = { .primary = WM831X_UV_INT, .reg = 3, .mask = WM831X_UV_LDO9_EINT, }, [WM831X_IRQ_UV_LDO10] = { .primary = WM831X_UV_INT, .reg = 3, .mask = WM831X_UV_LDO10_EINT, }, [WM831X_IRQ_UV_DC1] = { .primary = WM831X_UV_INT, .reg = 4, .mask = WM831X_UV_DC1_EINT, }, [WM831X_IRQ_UV_DC2] = { .primary = WM831X_UV_INT, .reg = 4, .mask = WM831X_UV_DC2_EINT, }, [WM831X_IRQ_UV_DC3] = { .primary = WM831X_UV_INT, .reg = 4, .mask = WM831X_UV_DC3_EINT, }, [WM831X_IRQ_UV_DC4] = { .primary = WM831X_UV_INT, .reg = 4, .mask = WM831X_UV_DC4_EINT, }, }; static inline int irq_data_to_status_reg(struct wm831x_irq_data *irq_data) { return WM831X_INTERRUPT_STATUS_1 - 1 + irq_data->reg; } static inline struct wm831x_irq_data *irq_to_wm831x_irq(struct wm831x *wm831x, int irq) { return &wm831x_irqs[irq]; } static void wm831x_irq_lock(struct irq_data *data) { struct wm831x *wm831x = irq_data_get_irq_chip_data(data); mutex_lock(&wm831x->irq_lock); } static void wm831x_irq_sync_unlock(struct irq_data *data) { struct wm831x *wm831x = irq_data_get_irq_chip_data(data); int i; for (i = 0; i < ARRAY_SIZE(wm831x->gpio_update); i++) { if (wm831x->gpio_update[i]) { wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + i, WM831X_GPN_INT_MODE | WM831X_GPN_POL, wm831x->gpio_update[i]); wm831x->gpio_update[i] = 0; } } for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) { /* If there's been a change in the mask write it back * to the hardware. */ if (wm831x->irq_masks_cur[i] != wm831x->irq_masks_cache[i]) { dev_dbg(wm831x->dev, "IRQ mask sync: %x = %x\n", WM831X_INTERRUPT_STATUS_1_MASK + i, wm831x->irq_masks_cur[i]); wm831x->irq_masks_cache[i] = wm831x->irq_masks_cur[i]; wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1_MASK + i, wm831x->irq_masks_cur[i]); } } mutex_unlock(&wm831x->irq_lock); } static void wm831x_irq_enable(struct irq_data *data) { struct wm831x *wm831x = irq_data_get_irq_chip_data(data); struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x, data->hwirq); wm831x->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask; } static void wm831x_irq_disable(struct irq_data *data) { struct wm831x *wm831x = irq_data_get_irq_chip_data(data); struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x, data->hwirq); wm831x->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask; } static int wm831x_irq_set_type(struct irq_data *data, unsigned int type) { struct wm831x *wm831x = irq_data_get_irq_chip_data(data); int irq; irq = data->hwirq; if (irq < WM831X_IRQ_GPIO_1 || irq > WM831X_IRQ_GPIO_11) { /* Ignore internal-only IRQs */ if (irq >= 0 && irq < WM831X_NUM_IRQS) return 0; else return -EINVAL; } /* Rebase the IRQ into the GPIO range so we've got a sensible array * index. */ irq -= WM831X_IRQ_GPIO_1; /* We set the high bit to flag that we need an update; don't * do the update here as we can be called with the bus lock * held. */ wm831x->gpio_level_low[irq] = false; wm831x->gpio_level_high[irq] = false; switch (type) { case IRQ_TYPE_EDGE_BOTH: wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_INT_MODE; break; case IRQ_TYPE_EDGE_RISING: wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL; break; case IRQ_TYPE_EDGE_FALLING: wm831x->gpio_update[irq] = 0x10000; break; case IRQ_TYPE_LEVEL_HIGH: wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL; wm831x->gpio_level_high[irq] = true; break; case IRQ_TYPE_LEVEL_LOW: wm831x->gpio_update[irq] = 0x10000; wm831x->gpio_level_low[irq] = true; break; default: return -EINVAL; } return 0; } static struct irq_chip wm831x_irq_chip = { .name = "wm831x", .irq_bus_lock = wm831x_irq_lock, .irq_bus_sync_unlock = wm831x_irq_sync_unlock, .irq_disable = wm831x_irq_disable, .irq_enable = wm831x_irq_enable, .irq_set_type = wm831x_irq_set_type, }; /* The processing of the primary interrupt occurs in a thread so that * we can interact with the device over I2C or SPI. */ static irqreturn_t wm831x_irq_thread(int irq, void *data) { struct wm831x *wm831x = data; unsigned int i; int primary, status_addr, ret; int status_regs[WM831X_NUM_IRQ_REGS] = { 0 }; int read[WM831X_NUM_IRQ_REGS] = { 0 }; int *status; primary = wm831x_reg_read(wm831x, WM831X_SYSTEM_INTERRUPTS); if (primary < 0) { dev_err(wm831x->dev, "Failed to read system interrupt: %d\n", primary); goto out; } /* The touch interrupts are visible in the primary register as * an optimisation; open code this to avoid complicating the * main handling loop and so we can also skip iterating the * descriptors. */ if (primary & WM831X_TCHPD_INT) handle_nested_irq(irq_find_mapping(wm831x->irq_domain, WM831X_IRQ_TCHPD)); if (primary & WM831X_TCHDATA_INT) handle_nested_irq(irq_find_mapping(wm831x->irq_domain, WM831X_IRQ_TCHDATA)); primary &= ~(WM831X_TCHDATA_EINT | WM831X_TCHPD_EINT); for (i = 0; i < ARRAY_SIZE(wm831x_irqs); i++) { int offset = wm831x_irqs[i].reg - 1; if (!(primary & wm831x_irqs[i].primary)) continue; status = &status_regs[offset]; /* Hopefully there should only be one register to read * each time otherwise we ought to do a block read. */ if (!read[offset]) { status_addr = irq_data_to_status_reg(&wm831x_irqs[i]); *status = wm831x_reg_read(wm831x, status_addr); if (*status < 0) { dev_err(wm831x->dev, "Failed to read IRQ status: %d\n", *status); goto out; } read[offset] = 1; /* Ignore any bits that we don't think are masked */ *status &= ~wm831x->irq_masks_cur[offset]; /* Acknowledge now so we don't miss * notifications while we handle. */ wm831x_reg_write(wm831x, status_addr, *status); } if (*status & wm831x_irqs[i].mask) handle_nested_irq(irq_find_mapping(wm831x->irq_domain, i)); /* Simulate an edge triggered IRQ by polling the input * status. This is sucky but improves interoperability. */ if (primary == WM831X_GP_INT && wm831x->gpio_level_high[i - WM831X_IRQ_GPIO_1]) { ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL); while (ret & 1 << (i - WM831X_IRQ_GPIO_1)) { handle_nested_irq(irq_find_mapping(wm831x->irq_domain, i)); ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL); } } if (primary == WM831X_GP_INT && wm831x->gpio_level_low[i - WM831X_IRQ_GPIO_1]) { ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL); while (!(ret & 1 << (i - WM831X_IRQ_GPIO_1))) { handle_nested_irq(irq_find_mapping(wm831x->irq_domain, i)); ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL); } } } out: return IRQ_HANDLED; } static int wm831x_irq_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hw) { irq_set_chip_data(virq, h->host_data); irq_set_chip_and_handler(virq, &wm831x_irq_chip, handle_edge_irq); irq_set_nested_thread(virq, 1); irq_set_noprobe(virq); return 0; } static const struct irq_domain_ops wm831x_irq_domain_ops = { .map = wm831x_irq_map, .xlate = irq_domain_xlate_twocell, }; int wm831x_irq_init(struct wm831x *wm831x, int irq) { struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); struct irq_domain *domain; int i, ret, irq_base; mutex_init(&wm831x->irq_lock); /* Mask the individual interrupt sources */ for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) { wm831x->irq_masks_cur[i] = 0xffff; wm831x->irq_masks_cache[i] = 0xffff; wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1_MASK + i, 0xffff); } /* Try to dynamically allocate IRQs if no base is specified */ if (pdata && pdata->irq_base) { irq_base = irq_alloc_descs(pdata->irq_base, 0, WM831X_NUM_IRQS, 0); if (irq_base < 0) { dev_warn(wm831x->dev, "Failed to allocate IRQs: %d\n", irq_base); irq_base = 0; } } else { irq_base = 0; } if (irq_base) domain = irq_domain_add_legacy(wm831x->dev->of_node, ARRAY_SIZE(wm831x_irqs), irq_base, 0, &wm831x_irq_domain_ops, wm831x); else domain = irq_domain_add_linear(wm831x->dev->of_node, ARRAY_SIZE(wm831x_irqs), &wm831x_irq_domain_ops, wm831x); if (!domain) { dev_warn(wm831x->dev, "Failed to allocate IRQ domain\n"); return -EINVAL; } if (pdata && pdata->irq_cmos) i = 0; else i = WM831X_IRQ_OD; wm831x_set_bits(wm831x, WM831X_IRQ_CONFIG, WM831X_IRQ_OD, i); wm831x->irq = irq; wm831x->irq_domain = domain; if (irq) { /* Try to flag /IRQ as a wake source; there are a number of * unconditional wake sources in the PMIC so this isn't * conditional but we don't actually care *too* much if it * fails. */ ret = enable_irq_wake(irq); if (ret != 0) { dev_warn(wm831x->dev, "Can't enable IRQ as wake source: %d\n", ret); } ret = request_threaded_irq(irq, NULL, wm831x_irq_thread, IRQF_TRIGGER_LOW | IRQF_ONESHOT, "wm831x", wm831x); if (ret != 0) { dev_err(wm831x->dev, "Failed to request IRQ %d: %d\n", irq, ret); return ret; } } else { dev_warn(wm831x->dev, "No interrupt specified - functionality limited\n"); } /* Enable top level interrupts, we mask at secondary level */ wm831x_reg_write(wm831x, WM831X_SYSTEM_INTERRUPTS_MASK, 0); return 0; } void wm831x_irq_exit(struct wm831x *wm831x) { if (wm831x->irq) free_irq(wm831x->irq, wm831x); }