sirc.c
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/* Copyright (c) 2008-2009, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/irq.h>
static unsigned int int_enable;
static unsigned int wake_enable;
static struct sirc_regs_t sirc_regs = {
.int_enable = SPSS_SIRC_INT_ENABLE,
.int_enable_clear = SPSS_SIRC_INT_ENABLE_CLEAR,
.int_enable_set = SPSS_SIRC_INT_ENABLE_SET,
.int_type = SPSS_SIRC_INT_TYPE,
.int_polarity = SPSS_SIRC_INT_POLARITY,
.int_clear = SPSS_SIRC_INT_CLEAR,
};
static struct sirc_cascade_regs sirc_reg_table[] = {
{
.int_status = SPSS_SIRC_IRQ_STATUS,
.cascade_irq = INT_SIRC_0,
}
};
/* Mask off the given interrupt. Keep the int_enable mask in sync with
the enable reg, so it can be restored after power collapse. */
static void sirc_irq_mask(struct irq_data *d)
{
unsigned int mask;
mask = 1 << (d->irq - FIRST_SIRC_IRQ);
writel(mask, sirc_regs.int_enable_clear);
int_enable &= ~mask;
return;
}
/* Unmask the given interrupt. Keep the int_enable mask in sync with
the enable reg, so it can be restored after power collapse. */
static void sirc_irq_unmask(struct irq_data *d)
{
unsigned int mask;
mask = 1 << (d->irq - FIRST_SIRC_IRQ);
writel(mask, sirc_regs.int_enable_set);
int_enable |= mask;
return;
}
static void sirc_irq_ack(struct irq_data *d)
{
unsigned int mask;
mask = 1 << (d->irq - FIRST_SIRC_IRQ);
writel(mask, sirc_regs.int_clear);
return;
}
static int sirc_irq_set_wake(struct irq_data *d, unsigned int on)
{
unsigned int mask;
/* Used to set the interrupt enable mask during power collapse. */
mask = 1 << (d->irq - FIRST_SIRC_IRQ);
if (on)
wake_enable |= mask;
else
wake_enable &= ~mask;
return 0;
}
static int sirc_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
unsigned int mask;
unsigned int val;
mask = 1 << (d->irq - FIRST_SIRC_IRQ);
val = readl(sirc_regs.int_polarity);
if (flow_type & (IRQF_TRIGGER_LOW | IRQF_TRIGGER_FALLING))
val |= mask;
else
val &= ~mask;
writel(val, sirc_regs.int_polarity);
val = readl(sirc_regs.int_type);
if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
val |= mask;
__irq_set_handler_locked(d->irq, handle_edge_irq);
} else {
val &= ~mask;
__irq_set_handler_locked(d->irq, handle_level_irq);
}
writel(val, sirc_regs.int_type);
return 0;
}
/* Finds the pending interrupt on the passed cascade irq and redrives it */
static void sirc_irq_handler(unsigned int irq, struct irq_desc *desc)
{
unsigned int reg = 0;
unsigned int sirq;
unsigned int status;
while ((reg < ARRAY_SIZE(sirc_reg_table)) &&
(sirc_reg_table[reg].cascade_irq != irq))
reg++;
status = readl(sirc_reg_table[reg].int_status);
status &= SIRC_MASK;
if (status == 0)
return;
for (sirq = 0;
(sirq < NR_SIRC_IRQS) && ((status & (1U << sirq)) == 0);
sirq++)
;
generic_handle_irq(sirq+FIRST_SIRC_IRQ);
desc->irq_data.chip->irq_ack(&desc->irq_data);
}
static struct irq_chip sirc_irq_chip = {
.name = "sirc",
.irq_ack = sirc_irq_ack,
.irq_mask = sirc_irq_mask,
.irq_unmask = sirc_irq_unmask,
.irq_set_wake = sirc_irq_set_wake,
.irq_set_type = sirc_irq_set_type,
};
void __init msm_init_sirc(void)
{
int i;
int_enable = 0;
wake_enable = 0;
for (i = FIRST_SIRC_IRQ; i < LAST_SIRC_IRQ; i++) {
irq_set_chip_and_handler(i, &sirc_irq_chip, handle_edge_irq);
set_irq_flags(i, IRQF_VALID);
}
for (i = 0; i < ARRAY_SIZE(sirc_reg_table); i++) {
irq_set_chained_handler(sirc_reg_table[i].cascade_irq,
sirc_irq_handler);
irq_set_irq_wake(sirc_reg_table[i].cascade_irq, 1);
}
return;
}