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-/*
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- * Interrupt controller support for TWL6040
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- *
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- * Author: Misael Lopez Cruz <misael.lopez@ti.com>
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- *
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- * Copyright: (C) 2011 Texas Instruments, Inc.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- * General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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- * 02110-1301 USA
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- *
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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/err.h>
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-#include <linux/irq.h>
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-#include <linux/of.h>
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-#include <linux/irqdomain.h>
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-#include <linux/interrupt.h>
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-#include <linux/mfd/core.h>
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-#include <linux/mfd/twl6040.h>
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-
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-struct twl6040_irq_data {
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- int mask;
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- int status;
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-};
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-
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-static struct twl6040_irq_data twl6040_irqs[] = {
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- {
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- .mask = TWL6040_THMSK,
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- .status = TWL6040_THINT,
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- },
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- {
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- .mask = TWL6040_PLUGMSK,
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- .status = TWL6040_PLUGINT | TWL6040_UNPLUGINT,
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- },
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- {
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- .mask = TWL6040_HOOKMSK,
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- .status = TWL6040_HOOKINT,
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- },
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- {
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- .mask = TWL6040_HFMSK,
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- .status = TWL6040_HFINT,
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- },
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- {
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- .mask = TWL6040_VIBMSK,
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- .status = TWL6040_VIBINT,
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- },
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- {
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- .mask = TWL6040_READYMSK,
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- .status = TWL6040_READYINT,
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- },
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-};
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-
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-static inline
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-struct twl6040_irq_data *irq_to_twl6040_irq(struct twl6040 *twl6040,
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- int irq)
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-{
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- return &twl6040_irqs[irq - twl6040->irq_base];
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-}
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-
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-static void twl6040_irq_lock(struct irq_data *data)
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-{
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- struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);
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-
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- mutex_lock(&twl6040->irq_mutex);
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-}
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-
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-static void twl6040_irq_sync_unlock(struct irq_data *data)
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-{
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- struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);
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-
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- /* write back to hardware any change in irq mask */
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- if (twl6040->irq_masks_cur != twl6040->irq_masks_cache) {
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- twl6040->irq_masks_cache = twl6040->irq_masks_cur;
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- twl6040_reg_write(twl6040, TWL6040_REG_INTMR,
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- twl6040->irq_masks_cur);
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- }
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-
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- mutex_unlock(&twl6040->irq_mutex);
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-}
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-
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-static void twl6040_irq_enable(struct irq_data *data)
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-{
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- struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);
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- struct twl6040_irq_data *irq_data = irq_to_twl6040_irq(twl6040,
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- data->irq);
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-
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- twl6040->irq_masks_cur &= ~irq_data->mask;
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-}
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-
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-static void twl6040_irq_disable(struct irq_data *data)
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-{
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- struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);
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- struct twl6040_irq_data *irq_data = irq_to_twl6040_irq(twl6040,
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- data->irq);
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-
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- twl6040->irq_masks_cur |= irq_data->mask;
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-}
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-
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-static struct irq_chip twl6040_irq_chip = {
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- .name = "twl6040",
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- .irq_bus_lock = twl6040_irq_lock,
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- .irq_bus_sync_unlock = twl6040_irq_sync_unlock,
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- .irq_enable = twl6040_irq_enable,
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- .irq_disable = twl6040_irq_disable,
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-};
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-
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-static irqreturn_t twl6040_irq_thread(int irq, void *data)
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-{
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- struct twl6040 *twl6040 = data;
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- u8 intid;
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- int i;
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-
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- intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
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-
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- /* apply masking and report (backwards to handle READYINT first) */
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- for (i = ARRAY_SIZE(twl6040_irqs) - 1; i >= 0; i--) {
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- if (twl6040->irq_masks_cur & twl6040_irqs[i].mask)
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- intid &= ~twl6040_irqs[i].status;
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- if (intid & twl6040_irqs[i].status)
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- handle_nested_irq(twl6040->irq_base + i);
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- }
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-
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- /* ack unmasked irqs */
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- twl6040_reg_write(twl6040, TWL6040_REG_INTID, intid);
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-
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- return IRQ_HANDLED;
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-}
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-
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-int twl6040_irq_init(struct twl6040 *twl6040)
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-{
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- struct device_node *node = twl6040->dev->of_node;
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- int i, nr_irqs, irq_base, ret;
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- u8 val;
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-
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- mutex_init(&twl6040->irq_mutex);
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-
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- /* mask the individual interrupt sources */
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- twl6040->irq_masks_cur = TWL6040_ALLINT_MSK;
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- twl6040->irq_masks_cache = TWL6040_ALLINT_MSK;
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- twl6040_reg_write(twl6040, TWL6040_REG_INTMR, TWL6040_ALLINT_MSK);
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-
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- nr_irqs = ARRAY_SIZE(twl6040_irqs);
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-
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- irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
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- if (IS_ERR_VALUE(irq_base)) {
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- dev_err(twl6040->dev, "Fail to allocate IRQ descs\n");
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- return irq_base;
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- }
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- twl6040->irq_base = irq_base;
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-
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- irq_domain_add_legacy(node, ARRAY_SIZE(twl6040_irqs), irq_base, 0,
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- &irq_domain_simple_ops, NULL);
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-
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- /* Register them with genirq */
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- for (i = irq_base; i < irq_base + nr_irqs; i++) {
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- irq_set_chip_data(i, twl6040);
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- irq_set_chip_and_handler(i, &twl6040_irq_chip,
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- handle_level_irq);
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- irq_set_nested_thread(i, 1);
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-
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- /* ARM needs us to explicitly flag the IRQ as valid
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- * and will set them noprobe when we do so. */
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-#ifdef CONFIG_ARM
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- set_irq_flags(i, IRQF_VALID);
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-#else
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- irq_set_noprobe(i);
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-#endif
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- }
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-
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- ret = request_threaded_irq(twl6040->irq, NULL, twl6040_irq_thread,
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- IRQF_ONESHOT, "twl6040", twl6040);
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- if (ret) {
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- dev_err(twl6040->dev, "failed to request IRQ %d: %d\n",
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- twl6040->irq, ret);
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- return ret;
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- }
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-
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- /* reset interrupts */
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- val = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
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-
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- /* interrupts cleared on write */
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- twl6040_clear_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_INTCLRMODE);
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-
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- return 0;
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-}
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-EXPORT_SYMBOL(twl6040_irq_init);
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-
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-void twl6040_irq_exit(struct twl6040 *twl6040)
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-{
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- free_irq(twl6040->irq, twl6040);
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-}
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-EXPORT_SYMBOL(twl6040_irq_exit);
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Peter Ujfalusi