/* * tps65910-irq.c -- TI TPS6591x * * Copyright 2010 Texas Instruments Inc. * * Author: Graeme Gregory <gg@slimlogic.co.uk> * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk> * * 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/init.h> #include <linux/bug.h> #include <linux/device.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/gpio.h> #include <linux/mfd/tps65910.h> static inline int irq_to_tps65910_irq(struct tps65910 *tps65910, int irq) { return (irq - tps65910->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 tps65910_irq(int irq, void *irq_data) { struct tps65910 *tps65910 = irq_data; u32 irq_sts; u32 irq_mask; u8 reg; int i; tps65910->read(tps65910, TPS65910_INT_STS, 1, ®); irq_sts = reg; tps65910->read(tps65910, TPS65910_INT_STS2, 1, ®); irq_sts |= reg << 8; switch (tps65910_chip_id(tps65910)) { case TPS65911: tps65910->read(tps65910, TPS65910_INT_STS3, 1, ®); irq_sts |= reg << 16; } tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®); irq_mask = reg; tps65910->read(tps65910, TPS65910_INT_MSK2, 1, ®); irq_mask |= reg << 8; switch (tps65910_chip_id(tps65910)) { case TPS65911: tps65910->read(tps65910, TPS65910_INT_MSK3, 1, ®); irq_mask |= reg << 16; } irq_sts &= ~irq_mask; if (!irq_sts) return IRQ_NONE; for (i = 0; i < tps65910->irq_num; i++) { if (!(irq_sts & (1 << i))) continue; handle_nested_irq(tps65910->irq_base + i); } /* Write the STS register back to clear IRQs we handled */ reg = irq_sts & 0xFF; irq_sts >>= 8; tps65910->write(tps65910, TPS65910_INT_STS, 1, ®); reg = irq_sts & 0xFF; tps65910->write(tps65910, TPS65910_INT_STS2, 1, ®); switch (tps65910_chip_id(tps65910)) { case TPS65911: reg = irq_sts >> 8; tps65910->write(tps65910, TPS65910_INT_STS3, 1, ®); } return IRQ_HANDLED; } static void tps65910_irq_lock(struct irq_data *data) { struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data); mutex_lock(&tps65910->irq_lock); } static void tps65910_irq_sync_unlock(struct irq_data *data) { struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data); u32 reg_mask; u8 reg; tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®); reg_mask = reg; tps65910->read(tps65910, TPS65910_INT_MSK2, 1, ®); reg_mask |= reg << 8; switch (tps65910_chip_id(tps65910)) { case TPS65911: tps65910->read(tps65910, TPS65910_INT_MSK3, 1, ®); reg_mask |= reg << 16; } if (tps65910->irq_mask != reg_mask) { reg = tps65910->irq_mask & 0xFF; tps65910->write(tps65910, TPS65910_INT_MSK, 1, ®); reg = tps65910->irq_mask >> 8 & 0xFF; tps65910->write(tps65910, TPS65910_INT_MSK2, 1, ®); switch (tps65910_chip_id(tps65910)) { case TPS65911: reg = tps65910->irq_mask >> 16; tps65910->write(tps65910, TPS65910_INT_MSK3, 1, ®); } } mutex_unlock(&tps65910->irq_lock); } static void tps65910_irq_enable(struct irq_data *data) { struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data); tps65910->irq_mask &= ~( 1 << irq_to_tps65910_irq(tps65910, data->irq)); } static void tps65910_irq_disable(struct irq_data *data) { struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data); tps65910->irq_mask |= ( 1 << irq_to_tps65910_irq(tps65910, data->irq)); } #ifdef CONFIG_PM_SLEEP static int tps65910_irq_set_wake(struct irq_data *data, unsigned int enable) { struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data); return irq_set_irq_wake(tps65910->chip_irq, enable); } #else #define tps65910_irq_set_wake NULL #endif static struct irq_chip tps65910_irq_chip = { .name = "tps65910", .irq_bus_lock = tps65910_irq_lock, .irq_bus_sync_unlock = tps65910_irq_sync_unlock, .irq_disable = tps65910_irq_disable, .irq_enable = tps65910_irq_enable, .irq_set_wake = tps65910_irq_set_wake, }; int tps65910_irq_init(struct tps65910 *tps65910, int irq, struct tps65910_platform_data *pdata) { int ret, cur_irq; int flags = IRQF_ONESHOT; if (!irq) { dev_warn(tps65910->dev, "No interrupt support, no core IRQ\n"); return -EINVAL; } if (!pdata || !pdata->irq_base) { dev_warn(tps65910->dev, "No interrupt support, no IRQ base\n"); return -EINVAL; } tps65910->irq_mask = 0xFFFFFF; mutex_init(&tps65910->irq_lock); tps65910->chip_irq = irq; tps65910->irq_base = pdata->irq_base; switch (tps65910_chip_id(tps65910)) { case TPS65910: tps65910->irq_num = TPS65910_NUM_IRQ; break; case TPS65911: tps65910->irq_num = TPS65911_NUM_IRQ; break; } /* Register with genirq */ for (cur_irq = tps65910->irq_base; cur_irq < tps65910->irq_num + tps65910->irq_base; cur_irq++) { irq_set_chip_data(cur_irq, tps65910); irq_set_chip_and_handler(cur_irq, &tps65910_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 } ret = request_threaded_irq(irq, NULL, tps65910_irq, flags, "tps65910", tps65910); irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW); if (ret != 0) dev_err(tps65910->dev, "Failed to request IRQ: %d\n", ret); return ret; } int tps65910_irq_exit(struct tps65910 *tps65910) { if (tps65910->chip_irq) free_irq(tps65910->chip_irq, tps65910); return 0; }