624 lines
14 KiB
C
624 lines
14 KiB
C
/*
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* wm831x-irq.c -- Interrupt controller support for Wolfson WM831x PMICs
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*
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* Copyright 2009 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/irq.h>
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#include <linux/mfd/core.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/wm831x/core.h>
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#include <linux/mfd/wm831x/pdata.h>
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#include <linux/mfd/wm831x/gpio.h>
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#include <linux/mfd/wm831x/irq.h>
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#include <linux/delay.h>
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struct wm831x_irq_data {
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int primary;
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int reg;
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int mask;
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};
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static struct wm831x_irq_data wm831x_irqs[] = {
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[WM831X_IRQ_TEMP_THW] = {
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.primary = WM831X_TEMP_INT,
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.reg = 1,
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.mask = WM831X_TEMP_THW_EINT,
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},
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[WM831X_IRQ_GPIO_1] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP1_EINT,
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},
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[WM831X_IRQ_GPIO_2] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP2_EINT,
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},
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[WM831X_IRQ_GPIO_3] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP3_EINT,
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},
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[WM831X_IRQ_GPIO_4] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP4_EINT,
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},
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[WM831X_IRQ_GPIO_5] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP5_EINT,
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},
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[WM831X_IRQ_GPIO_6] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP6_EINT,
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},
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[WM831X_IRQ_GPIO_7] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP7_EINT,
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},
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[WM831X_IRQ_GPIO_8] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP8_EINT,
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},
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[WM831X_IRQ_GPIO_9] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP9_EINT,
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},
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[WM831X_IRQ_GPIO_10] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP10_EINT,
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},
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[WM831X_IRQ_GPIO_11] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP11_EINT,
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},
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[WM831X_IRQ_GPIO_12] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP12_EINT,
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},
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[WM831X_IRQ_GPIO_13] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP13_EINT,
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},
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[WM831X_IRQ_GPIO_14] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP14_EINT,
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},
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[WM831X_IRQ_GPIO_15] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP15_EINT,
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},
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[WM831X_IRQ_GPIO_16] = {
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.primary = WM831X_GP_INT,
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.reg = 5,
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.mask = WM831X_GP16_EINT,
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},
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[WM831X_IRQ_ON] = {
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.primary = WM831X_ON_PIN_INT,
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.reg = 1,
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.mask = WM831X_ON_PIN_EINT,
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},
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[WM831X_IRQ_PPM_SYSLO] = {
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.primary = WM831X_PPM_INT,
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.reg = 1,
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.mask = WM831X_PPM_SYSLO_EINT,
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},
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[WM831X_IRQ_PPM_PWR_SRC] = {
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.primary = WM831X_PPM_INT,
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.reg = 1,
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.mask = WM831X_PPM_PWR_SRC_EINT,
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},
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[WM831X_IRQ_PPM_USB_CURR] = {
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.primary = WM831X_PPM_INT,
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.reg = 1,
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.mask = WM831X_PPM_USB_CURR_EINT,
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},
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[WM831X_IRQ_WDOG_TO] = {
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.primary = WM831X_WDOG_INT,
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.reg = 1,
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.mask = WM831X_WDOG_TO_EINT,
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},
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[WM831X_IRQ_RTC_PER] = {
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.primary = WM831X_RTC_INT,
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.reg = 1,
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.mask = WM831X_RTC_PER_EINT,
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},
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[WM831X_IRQ_RTC_ALM] = {
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.primary = WM831X_RTC_INT,
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.reg = 1,
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.mask = WM831X_RTC_ALM_EINT,
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},
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[WM831X_IRQ_CHG_BATT_HOT] = {
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.primary = WM831X_CHG_INT,
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.reg = 2,
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.mask = WM831X_CHG_BATT_HOT_EINT,
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},
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[WM831X_IRQ_CHG_BATT_COLD] = {
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.primary = WM831X_CHG_INT,
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.reg = 2,
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.mask = WM831X_CHG_BATT_COLD_EINT,
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},
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[WM831X_IRQ_CHG_BATT_FAIL] = {
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.primary = WM831X_CHG_INT,
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.reg = 2,
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.mask = WM831X_CHG_BATT_FAIL_EINT,
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},
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[WM831X_IRQ_CHG_OV] = {
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.primary = WM831X_CHG_INT,
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.reg = 2,
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.mask = WM831X_CHG_OV_EINT,
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},
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[WM831X_IRQ_CHG_END] = {
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.primary = WM831X_CHG_INT,
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.reg = 2,
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.mask = WM831X_CHG_END_EINT,
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},
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[WM831X_IRQ_CHG_TO] = {
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.primary = WM831X_CHG_INT,
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.reg = 2,
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.mask = WM831X_CHG_TO_EINT,
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},
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[WM831X_IRQ_CHG_MODE] = {
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.primary = WM831X_CHG_INT,
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.reg = 2,
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.mask = WM831X_CHG_MODE_EINT,
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},
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[WM831X_IRQ_CHG_START] = {
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.primary = WM831X_CHG_INT,
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.reg = 2,
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.mask = WM831X_CHG_START_EINT,
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},
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[WM831X_IRQ_TCHDATA] = {
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.primary = WM831X_TCHDATA_INT,
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.reg = 1,
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.mask = WM831X_TCHDATA_EINT,
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},
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[WM831X_IRQ_TCHPD] = {
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.primary = WM831X_TCHPD_INT,
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.reg = 1,
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.mask = WM831X_TCHPD_EINT,
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},
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[WM831X_IRQ_AUXADC_DATA] = {
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.primary = WM831X_AUXADC_INT,
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.reg = 1,
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.mask = WM831X_AUXADC_DATA_EINT,
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},
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[WM831X_IRQ_AUXADC_DCOMP1] = {
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.primary = WM831X_AUXADC_INT,
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.reg = 1,
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.mask = WM831X_AUXADC_DCOMP1_EINT,
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},
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[WM831X_IRQ_AUXADC_DCOMP2] = {
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.primary = WM831X_AUXADC_INT,
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.reg = 1,
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.mask = WM831X_AUXADC_DCOMP2_EINT,
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},
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[WM831X_IRQ_AUXADC_DCOMP3] = {
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.primary = WM831X_AUXADC_INT,
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.reg = 1,
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.mask = WM831X_AUXADC_DCOMP3_EINT,
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},
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[WM831X_IRQ_AUXADC_DCOMP4] = {
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.primary = WM831X_AUXADC_INT,
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.reg = 1,
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.mask = WM831X_AUXADC_DCOMP4_EINT,
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},
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[WM831X_IRQ_CS1] = {
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.primary = WM831X_CS_INT,
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.reg = 2,
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.mask = WM831X_CS1_EINT,
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},
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[WM831X_IRQ_CS2] = {
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.primary = WM831X_CS_INT,
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.reg = 2,
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.mask = WM831X_CS2_EINT,
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},
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[WM831X_IRQ_HC_DC1] = {
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.primary = WM831X_HC_INT,
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.reg = 4,
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.mask = WM831X_HC_DC1_EINT,
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},
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[WM831X_IRQ_HC_DC2] = {
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.primary = WM831X_HC_INT,
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.reg = 4,
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.mask = WM831X_HC_DC2_EINT,
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},
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[WM831X_IRQ_UV_LDO1] = {
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.primary = WM831X_UV_INT,
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.reg = 3,
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.mask = WM831X_UV_LDO1_EINT,
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},
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[WM831X_IRQ_UV_LDO2] = {
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.primary = WM831X_UV_INT,
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.reg = 3,
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.mask = WM831X_UV_LDO2_EINT,
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},
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[WM831X_IRQ_UV_LDO3] = {
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.primary = WM831X_UV_INT,
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.reg = 3,
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.mask = WM831X_UV_LDO3_EINT,
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},
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[WM831X_IRQ_UV_LDO4] = {
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.primary = WM831X_UV_INT,
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.reg = 3,
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.mask = WM831X_UV_LDO4_EINT,
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},
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[WM831X_IRQ_UV_LDO5] = {
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.primary = WM831X_UV_INT,
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.reg = 3,
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.mask = WM831X_UV_LDO5_EINT,
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},
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[WM831X_IRQ_UV_LDO6] = {
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.primary = WM831X_UV_INT,
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.reg = 3,
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.mask = WM831X_UV_LDO6_EINT,
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},
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[WM831X_IRQ_UV_LDO7] = {
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.primary = WM831X_UV_INT,
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.reg = 3,
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.mask = WM831X_UV_LDO7_EINT,
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},
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[WM831X_IRQ_UV_LDO8] = {
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.primary = WM831X_UV_INT,
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.reg = 3,
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.mask = WM831X_UV_LDO8_EINT,
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},
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[WM831X_IRQ_UV_LDO9] = {
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.primary = WM831X_UV_INT,
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.reg = 3,
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.mask = WM831X_UV_LDO9_EINT,
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},
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[WM831X_IRQ_UV_LDO10] = {
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.primary = WM831X_UV_INT,
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.reg = 3,
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.mask = WM831X_UV_LDO10_EINT,
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},
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[WM831X_IRQ_UV_DC1] = {
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.primary = WM831X_UV_INT,
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.reg = 4,
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.mask = WM831X_UV_DC1_EINT,
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},
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[WM831X_IRQ_UV_DC2] = {
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.primary = WM831X_UV_INT,
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.reg = 4,
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.mask = WM831X_UV_DC2_EINT,
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},
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[WM831X_IRQ_UV_DC3] = {
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.primary = WM831X_UV_INT,
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.reg = 4,
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.mask = WM831X_UV_DC3_EINT,
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},
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[WM831X_IRQ_UV_DC4] = {
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.primary = WM831X_UV_INT,
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.reg = 4,
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.mask = WM831X_UV_DC4_EINT,
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},
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};
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static inline int irq_data_to_status_reg(struct wm831x_irq_data *irq_data)
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{
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return WM831X_INTERRUPT_STATUS_1 - 1 + irq_data->reg;
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}
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static inline struct wm831x_irq_data *irq_to_wm831x_irq(struct wm831x *wm831x,
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int irq)
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{
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return &wm831x_irqs[irq - wm831x->irq_base];
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}
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static void wm831x_irq_lock(struct irq_data *data)
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{
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struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
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mutex_lock(&wm831x->irq_lock);
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}
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static void wm831x_irq_sync_unlock(struct irq_data *data)
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{
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struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
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int i;
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for (i = 0; i < ARRAY_SIZE(wm831x->gpio_update); i++) {
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if (wm831x->gpio_update[i]) {
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wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + i,
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WM831X_GPN_INT_MODE | WM831X_GPN_POL,
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wm831x->gpio_update[i]);
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wm831x->gpio_update[i] = 0;
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}
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}
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for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) {
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/* If there's been a change in the mask write it back
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* to the hardware. */
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if (wm831x->irq_masks_cur[i] != wm831x->irq_masks_cache[i]) {
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dev_dbg(wm831x->dev, "IRQ mask sync: %x = %x\n",
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WM831X_INTERRUPT_STATUS_1_MASK + i,
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wm831x->irq_masks_cur[i]);
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wm831x->irq_masks_cache[i] = wm831x->irq_masks_cur[i];
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wm831x_reg_write(wm831x,
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WM831X_INTERRUPT_STATUS_1_MASK + i,
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wm831x->irq_masks_cur[i]);
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}
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}
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mutex_unlock(&wm831x->irq_lock);
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}
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static void wm831x_irq_enable(struct irq_data *data)
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{
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struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
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struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x,
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data->irq);
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wm831x->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
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}
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static void wm831x_irq_disable(struct irq_data *data)
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{
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struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
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struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x,
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data->irq);
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wm831x->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
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}
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static int wm831x_irq_set_type(struct irq_data *data, unsigned int type)
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{
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struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
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int irq;
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irq = data->irq - wm831x->irq_base;
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if (irq < WM831X_IRQ_GPIO_1 || irq > WM831X_IRQ_GPIO_11) {
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/* Ignore internal-only IRQs */
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if (irq >= 0 && irq < WM831X_NUM_IRQS)
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return 0;
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else
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return -EINVAL;
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}
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/* Rebase the IRQ into the GPIO range so we've got a sensible array
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* index.
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*/
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irq -= WM831X_IRQ_GPIO_1;
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/* We set the high bit to flag that we need an update; don't
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* do the update here as we can be called with the bus lock
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* held.
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*/
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switch (type) {
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case IRQ_TYPE_EDGE_BOTH:
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wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_INT_MODE;
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wm831x->gpio_level[irq] = false;
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break;
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case IRQ_TYPE_EDGE_RISING:
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wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
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wm831x->gpio_level[irq] = false;
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break;
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case IRQ_TYPE_EDGE_FALLING:
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wm831x->gpio_update[irq] = 0x10000;
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wm831x->gpio_level[irq] = false;
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break;
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case IRQ_TYPE_LEVEL_HIGH:
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wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
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wm831x->gpio_level[irq] = true;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static struct irq_chip wm831x_irq_chip = {
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.name = "wm831x",
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.irq_bus_lock = wm831x_irq_lock,
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.irq_bus_sync_unlock = wm831x_irq_sync_unlock,
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.irq_disable = wm831x_irq_disable,
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.irq_enable = wm831x_irq_enable,
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.irq_set_type = wm831x_irq_set_type,
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};
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/* The processing of the primary interrupt occurs in a thread so that
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* we can interact with the device over I2C or SPI. */
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static irqreturn_t wm831x_irq_thread(int irq, void *data)
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{
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struct wm831x *wm831x = data;
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unsigned int i;
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int primary, status_addr, ret;
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int status_regs[WM831X_NUM_IRQ_REGS] = { 0 };
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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(wm831x->irq_base + WM831X_IRQ_TCHPD);
|
|
if (primary & WM831X_TCHDATA_INT)
|
|
handle_nested_irq(wm831x->irq_base + 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(wm831x->irq_base + 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[i - WM831X_IRQ_GPIO_1]) {
|
|
ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
|
|
while (ret & 1 << (i - WM831X_IRQ_GPIO_1)) {
|
|
handle_nested_irq(wm831x->irq_base + i);
|
|
ret = wm831x_reg_read(wm831x,
|
|
WM831X_GPIO_LEVEL);
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
int wm831x_irq_init(struct wm831x *wm831x, int irq)
|
|
{
|
|
struct wm831x_pdata *pdata = wm831x->dev->platform_data;
|
|
int i, cur_irq, ret;
|
|
|
|
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)
|
|
wm831x->irq_base = -1;
|
|
else
|
|
wm831x->irq_base = pdata->irq_base;
|
|
|
|
wm831x->irq_base = irq_alloc_descs(wm831x->irq_base, 0,
|
|
WM831X_NUM_IRQS, 0);
|
|
if (wm831x->irq_base < 0) {
|
|
dev_warn(wm831x->dev, "Failed to allocate IRQs: %d\n",
|
|
wm831x->irq_base);
|
|
wm831x->irq_base = 0;
|
|
return 0;
|
|
}
|
|
|
|
if (pdata && pdata->irq_cmos)
|
|
i = 0;
|
|
else
|
|
i = WM831X_IRQ_OD;
|
|
|
|
wm831x_set_bits(wm831x, WM831X_IRQ_CONFIG,
|
|
WM831X_IRQ_OD, i);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
wm831x->irq = irq;
|
|
|
|
/* Register them with genirq */
|
|
for (cur_irq = wm831x->irq_base;
|
|
cur_irq < ARRAY_SIZE(wm831x_irqs) + wm831x->irq_base;
|
|
cur_irq++) {
|
|
irq_set_chip_data(cur_irq, wm831x);
|
|
irq_set_chip_and_handler(cur_irq, &wm831x_irq_chip,
|
|
handle_edge_irq);
|
|
irq_set_nested_thread(cur_irq, 1);
|
|
|
|
/* ARM needs us to explicitly flag the IRQ as valid
|
|
* and will set them noprobe when we do so. */
|
|
#ifdef CONFIG_ARM
|
|
set_irq_flags(cur_irq, IRQF_VALID);
|
|
#else
|
|
irq_set_noprobe(cur_irq);
|
|
#endif
|
|
}
|
|
|
|
if (irq) {
|
|
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);
|
|
}
|