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![Peter Ujfalusi](/assets/img/avatar_default.png)
In order to operate correctly twl6040 needs correct interrupt configuration. The slave drivers (vibra, and ASoC codec) will refuse to probe, if the interrupt configuration is not correct. In this way some checks can be removed from the code. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Acked-by: Samuel Ortiz <sameo@linux.intel.com>
191 lines
4.8 KiB
C
191 lines
4.8 KiB
C
/*
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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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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/irq.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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struct twl6040_irq_data {
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int mask;
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int status;
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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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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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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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mutex_lock(&twl6040->irq_mutex);
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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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/* 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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mutex_unlock(&twl6040->irq_mutex);
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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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twl6040->irq_masks_cur &= ~irq_data->mask;
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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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twl6040->irq_masks_cur |= irq_data->mask;
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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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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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intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
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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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/* ack unmasked irqs */
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twl6040_reg_write(twl6040, TWL6040_REG_INTID, intid);
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return IRQ_HANDLED;
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}
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int twl6040_irq_init(struct twl6040 *twl6040)
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{
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int cur_irq, ret;
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u8 val;
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mutex_init(&twl6040->irq_mutex);
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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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/* Register them with genirq */
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for (cur_irq = twl6040->irq_base;
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cur_irq < twl6040->irq_base + ARRAY_SIZE(twl6040_irqs);
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cur_irq++) {
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irq_set_chip_data(cur_irq, twl6040);
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irq_set_chip_and_handler(cur_irq, &twl6040_irq_chip,
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handle_level_irq);
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irq_set_nested_thread(cur_irq, 1);
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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(cur_irq, IRQF_VALID);
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#else
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irq_set_noprobe(cur_irq);
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#endif
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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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/* reset interrupts */
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val = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
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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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return 0;
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}
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EXPORT_SYMBOL(twl6040_irq_init);
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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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