/* * wm8350-irq.c -- IRQ support for Wolfson WM8350 * * Copyright 2007, 2008, 2009 Wolfson Microelectronics PLC. * * Author: Liam Girdwood, Mark Brown * * 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/bug.h> #include <linux/device.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/mfd/wm8350/core.h> #include <linux/mfd/wm8350/audio.h> #include <linux/mfd/wm8350/comparator.h> #include <linux/mfd/wm8350/gpio.h> #include <linux/mfd/wm8350/pmic.h> #include <linux/mfd/wm8350/rtc.h> #include <linux/mfd/wm8350/supply.h> #include <linux/mfd/wm8350/wdt.h> #define WM8350_INT_OFFSET_1 0 #define WM8350_INT_OFFSET_2 1 #define WM8350_POWER_UP_INT_OFFSET 2 #define WM8350_UNDER_VOLTAGE_INT_OFFSET 3 #define WM8350_OVER_CURRENT_INT_OFFSET 4 #define WM8350_GPIO_INT_OFFSET 5 #define WM8350_COMPARATOR_INT_OFFSET 6 struct wm8350_irq_data { int primary; int reg; int mask; int primary_only; }; static struct wm8350_irq_data wm8350_irqs[] = { [WM8350_IRQ_OC_LS] = { .primary = WM8350_OC_INT, .reg = WM8350_OVER_CURRENT_INT_OFFSET, .mask = WM8350_OC_LS_EINT, .primary_only = 1, }, [WM8350_IRQ_UV_DC1] = { .primary = WM8350_UV_INT, .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, .mask = WM8350_UV_DC1_EINT, }, [WM8350_IRQ_UV_DC2] = { .primary = WM8350_UV_INT, .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, .mask = WM8350_UV_DC2_EINT, }, [WM8350_IRQ_UV_DC3] = { .primary = WM8350_UV_INT, .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, .mask = WM8350_UV_DC3_EINT, }, [WM8350_IRQ_UV_DC4] = { .primary = WM8350_UV_INT, .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, .mask = WM8350_UV_DC4_EINT, }, [WM8350_IRQ_UV_DC5] = { .primary = WM8350_UV_INT, .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, .mask = WM8350_UV_DC5_EINT, }, [WM8350_IRQ_UV_DC6] = { .primary = WM8350_UV_INT, .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, .mask = WM8350_UV_DC6_EINT, }, [WM8350_IRQ_UV_LDO1] = { .primary = WM8350_UV_INT, .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, .mask = WM8350_UV_LDO1_EINT, }, [WM8350_IRQ_UV_LDO2] = { .primary = WM8350_UV_INT, .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, .mask = WM8350_UV_LDO2_EINT, }, [WM8350_IRQ_UV_LDO3] = { .primary = WM8350_UV_INT, .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, .mask = WM8350_UV_LDO3_EINT, }, [WM8350_IRQ_UV_LDO4] = { .primary = WM8350_UV_INT, .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, .mask = WM8350_UV_LDO4_EINT, }, [WM8350_IRQ_CHG_BAT_HOT] = { .primary = WM8350_CHG_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_CHG_BAT_HOT_EINT, }, [WM8350_IRQ_CHG_BAT_COLD] = { .primary = WM8350_CHG_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_CHG_BAT_COLD_EINT, }, [WM8350_IRQ_CHG_BAT_FAIL] = { .primary = WM8350_CHG_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_CHG_BAT_FAIL_EINT, }, [WM8350_IRQ_CHG_TO] = { .primary = WM8350_CHG_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_CHG_TO_EINT, }, [WM8350_IRQ_CHG_END] = { .primary = WM8350_CHG_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_CHG_END_EINT, }, [WM8350_IRQ_CHG_START] = { .primary = WM8350_CHG_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_CHG_START_EINT, }, [WM8350_IRQ_CHG_FAST_RDY] = { .primary = WM8350_CHG_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_CHG_FAST_RDY_EINT, }, [WM8350_IRQ_CHG_VBATT_LT_3P9] = { .primary = WM8350_CHG_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_CHG_VBATT_LT_3P9_EINT, }, [WM8350_IRQ_CHG_VBATT_LT_3P1] = { .primary = WM8350_CHG_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_CHG_VBATT_LT_3P1_EINT, }, [WM8350_IRQ_CHG_VBATT_LT_2P85] = { .primary = WM8350_CHG_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_CHG_VBATT_LT_2P85_EINT, }, [WM8350_IRQ_RTC_ALM] = { .primary = WM8350_RTC_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_RTC_ALM_EINT, }, [WM8350_IRQ_RTC_SEC] = { .primary = WM8350_RTC_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_RTC_SEC_EINT, }, [WM8350_IRQ_RTC_PER] = { .primary = WM8350_RTC_INT, .reg = WM8350_INT_OFFSET_1, .mask = WM8350_RTC_PER_EINT, }, [WM8350_IRQ_CS1] = { .primary = WM8350_CS_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_CS1_EINT, }, [WM8350_IRQ_CS2] = { .primary = WM8350_CS_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_CS2_EINT, }, [WM8350_IRQ_SYS_HYST_COMP_FAIL] = { .primary = WM8350_SYS_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_SYS_HYST_COMP_FAIL_EINT, }, [WM8350_IRQ_SYS_CHIP_GT115] = { .primary = WM8350_SYS_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_SYS_CHIP_GT115_EINT, }, [WM8350_IRQ_SYS_CHIP_GT140] = { .primary = WM8350_SYS_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_SYS_CHIP_GT140_EINT, }, [WM8350_IRQ_SYS_WDOG_TO] = { .primary = WM8350_SYS_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_SYS_WDOG_TO_EINT, }, [WM8350_IRQ_AUXADC_DATARDY] = { .primary = WM8350_AUXADC_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_AUXADC_DATARDY_EINT, }, [WM8350_IRQ_AUXADC_DCOMP4] = { .primary = WM8350_AUXADC_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_AUXADC_DCOMP4_EINT, }, [WM8350_IRQ_AUXADC_DCOMP3] = { .primary = WM8350_AUXADC_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_AUXADC_DCOMP3_EINT, }, [WM8350_IRQ_AUXADC_DCOMP2] = { .primary = WM8350_AUXADC_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_AUXADC_DCOMP2_EINT, }, [WM8350_IRQ_AUXADC_DCOMP1] = { .primary = WM8350_AUXADC_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_AUXADC_DCOMP1_EINT, }, [WM8350_IRQ_USB_LIMIT] = { .primary = WM8350_USB_INT, .reg = WM8350_INT_OFFSET_2, .mask = WM8350_USB_LIMIT_EINT, .primary_only = 1, }, [WM8350_IRQ_WKUP_OFF_STATE] = { .primary = WM8350_WKUP_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_WKUP_OFF_STATE_EINT, }, [WM8350_IRQ_WKUP_HIB_STATE] = { .primary = WM8350_WKUP_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_WKUP_HIB_STATE_EINT, }, [WM8350_IRQ_WKUP_CONV_FAULT] = { .primary = WM8350_WKUP_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_WKUP_CONV_FAULT_EINT, }, [WM8350_IRQ_WKUP_WDOG_RST] = { .primary = WM8350_WKUP_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_WKUP_WDOG_RST_EINT, }, [WM8350_IRQ_WKUP_GP_PWR_ON] = { .primary = WM8350_WKUP_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_WKUP_GP_PWR_ON_EINT, }, [WM8350_IRQ_WKUP_ONKEY] = { .primary = WM8350_WKUP_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_WKUP_ONKEY_EINT, }, [WM8350_IRQ_WKUP_GP_WAKEUP] = { .primary = WM8350_WKUP_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_WKUP_GP_WAKEUP_EINT, }, [WM8350_IRQ_CODEC_JCK_DET_L] = { .primary = WM8350_CODEC_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_CODEC_JCK_DET_L_EINT, }, [WM8350_IRQ_CODEC_JCK_DET_R] = { .primary = WM8350_CODEC_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_CODEC_JCK_DET_R_EINT, }, [WM8350_IRQ_CODEC_MICSCD] = { .primary = WM8350_CODEC_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_CODEC_MICSCD_EINT, }, [WM8350_IRQ_CODEC_MICD] = { .primary = WM8350_CODEC_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_CODEC_MICD_EINT, }, [WM8350_IRQ_EXT_USB_FB] = { .primary = WM8350_EXT_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_EXT_USB_FB_EINT, }, [WM8350_IRQ_EXT_WALL_FB] = { .primary = WM8350_EXT_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_EXT_WALL_FB_EINT, }, [WM8350_IRQ_EXT_BAT_FB] = { .primary = WM8350_EXT_INT, .reg = WM8350_COMPARATOR_INT_OFFSET, .mask = WM8350_EXT_BAT_FB_EINT, }, [WM8350_IRQ_GPIO(0)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP0_EINT, }, [WM8350_IRQ_GPIO(1)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP1_EINT, }, [WM8350_IRQ_GPIO(2)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP2_EINT, }, [WM8350_IRQ_GPIO(3)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP3_EINT, }, [WM8350_IRQ_GPIO(4)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP4_EINT, }, [WM8350_IRQ_GPIO(5)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP5_EINT, }, [WM8350_IRQ_GPIO(6)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP6_EINT, }, [WM8350_IRQ_GPIO(7)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP7_EINT, }, [WM8350_IRQ_GPIO(8)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP8_EINT, }, [WM8350_IRQ_GPIO(9)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP9_EINT, }, [WM8350_IRQ_GPIO(10)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP10_EINT, }, [WM8350_IRQ_GPIO(11)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP11_EINT, }, [WM8350_IRQ_GPIO(12)] = { .primary = WM8350_GP_INT, .reg = WM8350_GPIO_INT_OFFSET, .mask = WM8350_GP12_EINT, }, }; static inline struct wm8350_irq_data *irq_to_wm8350_irq(struct wm8350 *wm8350, int irq) { return &wm8350_irqs[irq - wm8350->irq_base]; } /* * This is a threaded IRQ handler so can access I2C/SPI. Since all * interrupts are clear on read the IRQ line will be reasserted and * the physical IRQ will be handled again if another interrupt is * asserted while we run - in the normal course of events this is a * rare occurrence so we save I2C/SPI reads. We're also assuming that * it's rare to get lots of interrupts firing simultaneously so try to * minimise I/O. */ static irqreturn_t wm8350_irq(int irq, void *irq_data) { struct wm8350 *wm8350 = irq_data; u16 level_one; u16 sub_reg[WM8350_NUM_IRQ_REGS]; int read_done[WM8350_NUM_IRQ_REGS]; struct wm8350_irq_data *data; int i; level_one = wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS) & ~wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK); if (!level_one) return IRQ_NONE; memset(&read_done, 0, sizeof(read_done)); for (i = 0; i < ARRAY_SIZE(wm8350_irqs); i++) { data = &wm8350_irqs[i]; if (!(level_one & data->primary)) continue; if (!read_done[data->reg]) { sub_reg[data->reg] = wm8350_reg_read(wm8350, WM8350_INT_STATUS_1 + data->reg); sub_reg[data->reg] &= ~wm8350->irq_masks[data->reg]; read_done[data->reg] = 1; } if (sub_reg[data->reg] & data->mask) handle_nested_irq(wm8350->irq_base + i); } return IRQ_HANDLED; } static void wm8350_irq_lock(struct irq_data *data) { struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data); mutex_lock(&wm8350->irq_lock); } static void wm8350_irq_sync_unlock(struct irq_data *data) { struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data); int i; for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) { /* If there's been a change in the mask write it back * to the hardware. */ WARN_ON(regmap_update_bits(wm8350->regmap, WM8350_INT_STATUS_1_MASK + i, 0xffff, wm8350->irq_masks[i])); } mutex_unlock(&wm8350->irq_lock); } static void wm8350_irq_enable(struct irq_data *data) { struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data); struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350, data->irq); wm8350->irq_masks[irq_data->reg] &= ~irq_data->mask; } static void wm8350_irq_disable(struct irq_data *data) { struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data); struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350, data->irq); wm8350->irq_masks[irq_data->reg] |= irq_data->mask; } static struct irq_chip wm8350_irq_chip = { .name = "wm8350", .irq_bus_lock = wm8350_irq_lock, .irq_bus_sync_unlock = wm8350_irq_sync_unlock, .irq_disable = wm8350_irq_disable, .irq_enable = wm8350_irq_enable, }; int wm8350_irq_init(struct wm8350 *wm8350, int irq, struct wm8350_platform_data *pdata) { int ret, cur_irq, i; int flags = IRQF_ONESHOT; int irq_base = -1; if (!irq) { dev_warn(wm8350->dev, "No interrupt support, no core IRQ\n"); return 0; } /* Mask top level interrupts */ wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0xFFFF); /* Mask all individual interrupts by default and cache the * masks. We read the masks back since there are unwritable * bits in the mask registers. */ for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) { wm8350_reg_write(wm8350, WM8350_INT_STATUS_1_MASK + i, 0xFFFF); wm8350->irq_masks[i] = wm8350_reg_read(wm8350, WM8350_INT_STATUS_1_MASK + i); } mutex_init(&wm8350->irq_lock); wm8350->chip_irq = irq; if (pdata && pdata->irq_base > 0) irq_base = pdata->irq_base; wm8350->irq_base = irq_alloc_descs(irq_base, 0, ARRAY_SIZE(wm8350_irqs), 0); if (wm8350->irq_base < 0) { dev_warn(wm8350->dev, "Allocating irqs failed with %d\n", wm8350->irq_base); return 0; } if (pdata && pdata->irq_high) { flags |= IRQF_TRIGGER_HIGH; wm8350_set_bits(wm8350, WM8350_SYSTEM_CONTROL_1, WM8350_IRQ_POL); } else { flags |= IRQF_TRIGGER_LOW; wm8350_clear_bits(wm8350, WM8350_SYSTEM_CONTROL_1, WM8350_IRQ_POL); } /* Register with genirq */ for (cur_irq = wm8350->irq_base; cur_irq < ARRAY_SIZE(wm8350_irqs) + wm8350->irq_base; cur_irq++) { irq_set_chip_data(cur_irq, wm8350); irq_set_chip_and_handler(cur_irq, &wm8350_irq_chip, handle_edge_irq); irq_set_nested_thread(cur_irq, 1); irq_clear_status_flags(cur_irq, IRQ_NOREQUEST | IRQ_NOPROBE); } ret = request_threaded_irq(irq, NULL, wm8350_irq, flags, "wm8350", wm8350); if (ret != 0) dev_err(wm8350->dev, "Failed to request IRQ: %d\n", ret); /* Allow interrupts to fire */ wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0); return ret; } int wm8350_irq_exit(struct wm8350 *wm8350) { free_irq(wm8350->chip_irq, wm8350); return 0; }