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/*
* Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
* reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the NetLogic
* license below:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <asm/mipsregs.h>
#include <asm/netlogic/xlr/iomap.h>
#include <asm/netlogic/xlr/pic.h>
#include <asm/netlogic/xlr/xlr.h>
#include <asm/netlogic/interrupt.h>
#include <asm/netlogic/mips-extns.h>
static u64 nlm_irq_mask;
static DEFINE_SPINLOCK(nlm_pic_lock);
static void xlr_pic_enable(struct irq_data *d)
{
nlm_reg_t *mmio = netlogic_io_mmio(NETLOGIC_IO_PIC_OFFSET);
unsigned long flags;
nlm_reg_t reg;
int irq = d->irq;
WARN(!PIC_IRQ_IS_IRT(irq), "Bad irq %d", irq);
spin_lock_irqsave(&nlm_pic_lock, flags);
reg = netlogic_read_reg(mmio, PIC_IRT_1_BASE + irq - PIC_IRQ_BASE);
netlogic_write_reg(mmio, PIC_IRT_1_BASE + irq - PIC_IRQ_BASE,
reg | (1 << 6) | (1 << 30) | (1 << 31));
spin_unlock_irqrestore(&nlm_pic_lock, flags);
}
static void xlr_pic_mask(struct irq_data *d)
{
nlm_reg_t *mmio = netlogic_io_mmio(NETLOGIC_IO_PIC_OFFSET);
unsigned long flags;
nlm_reg_t reg;
int irq = d->irq;
WARN(!PIC_IRQ_IS_IRT(irq), "Bad irq %d", irq);
spin_lock_irqsave(&nlm_pic_lock, flags);
reg = netlogic_read_reg(mmio, PIC_IRT_1_BASE + irq - PIC_IRQ_BASE);
netlogic_write_reg(mmio, PIC_IRT_1_BASE + irq - PIC_IRQ_BASE,
reg | (1 << 6) | (1 << 30) | (0 << 31));
spin_unlock_irqrestore(&nlm_pic_lock, flags);
}
static void xlr_pic_ack(struct irq_data *d)
{
unsigned long flags;
nlm_reg_t *mmio;
int irq = d->irq;
WARN(!PIC_IRQ_IS_IRT(irq), "Bad irq %d", irq);
mmio = netlogic_io_mmio(NETLOGIC_IO_PIC_OFFSET);
spin_lock_irqsave(&nlm_pic_lock, flags);
netlogic_write_reg(mmio, PIC_INT_ACK, (1 << (irq - PIC_IRQ_BASE)));
spin_unlock_irqrestore(&nlm_pic_lock, flags);
}
/*
* This chip definition handles interrupts routed thru the XLR
* hardware PIC, currently IRQs 8-39 are mapped to hardware intr
* 0-31 wired the XLR PIC
*/
static struct irq_chip xlr_pic = {
.name = "XLR-PIC",
.irq_enable = xlr_pic_enable,
.irq_mask = xlr_pic_mask,
.irq_ack = xlr_pic_ack,
};
static void rsvd_irq_handler(struct irq_data *d)
{
WARN(d->irq >= PIC_IRQ_BASE, "Bad irq %d", d->irq);
}
/*
* Chip definition for CPU originated interrupts(timer, msg) and
* IPIs
*/
struct irq_chip nlm_cpu_intr = {
.name = "XLR-CPU-INTR",
.irq_enable = rsvd_irq_handler,
.irq_mask = rsvd_irq_handler,
.irq_ack = rsvd_irq_handler,
};
void __init init_xlr_irqs(void)
{
nlm_reg_t *mmio = netlogic_io_mmio(NETLOGIC_IO_PIC_OFFSET);
uint32_t thread_mask = 1;
int level, i;
pr_info("Interrupt thread mask [%x]\n", thread_mask);
for (i = 0; i < PIC_NUM_IRTS; i++) {
level = PIC_IRQ_IS_EDGE_TRIGGERED(i);
/* Bind all PIC irqs to boot cpu */
netlogic_write_reg(mmio, PIC_IRT_0_BASE + i, thread_mask);
/*
* Use local scheduling and high polarity for all IRTs
* Invalidate all IRTs, by default
*/
netlogic_write_reg(mmio, PIC_IRT_1_BASE + i,
(level << 30) | (1 << 6) | (PIC_IRQ_BASE + i));
}
/* Make all IRQs as level triggered by default */
for (i = 0; i < NR_IRQS; i++) {
if (PIC_IRQ_IS_IRT(i))
irq_set_chip_and_handler(i, &xlr_pic, handle_level_irq);
else
irq_set_chip_and_handler(i, &nlm_cpu_intr,
handle_level_irq);
}
#ifdef CONFIG_SMP
irq_set_chip_and_handler(IRQ_IPI_SMP_FUNCTION, &nlm_cpu_intr,
nlm_smp_function_ipi_handler);
irq_set_chip_and_handler(IRQ_IPI_SMP_RESCHEDULE, &nlm_cpu_intr,
nlm_smp_resched_ipi_handler);
nlm_irq_mask |=
((1ULL << IRQ_IPI_SMP_FUNCTION) | (1ULL << IRQ_IPI_SMP_RESCHEDULE));
#endif
/* unmask all PIC related interrupts. If no handler is installed by the
* drivers, it'll just ack the interrupt and return
*/
for (i = PIC_IRT_FIRST_IRQ; i <= PIC_IRT_LAST_IRQ; i++)
nlm_irq_mask |= (1ULL << i);
nlm_irq_mask |= (1ULL << IRQ_TIMER);
}
void __init arch_init_irq(void)
{
/* Initialize the irq descriptors */
init_xlr_irqs();
write_c0_eimr(nlm_irq_mask);
}
void __cpuinit nlm_smp_irq_init(void)
{
/* set interrupt mask for non-zero cpus */
write_c0_eimr(nlm_irq_mask);
}
asmlinkage void plat_irq_dispatch(void)
{
uint64_t eirr;
int i;
eirr = read_c0_eirr() & read_c0_eimr();
if (!eirr)
return;
/* no need of EIRR here, writing compare clears interrupt */
if (eirr & (1 << IRQ_TIMER)) {
do_IRQ(IRQ_TIMER);
return;
}
/* TODO use dcltz: optimize below code */
for (i = 63; i != -1; i--) {
if (eirr & (1ULL << i))
break;
}
if (i == -1) {
pr_err("no interrupt !!\n");
return;
}
/* Ack eirr */
write_c0_eirr(1ULL << i);
do_IRQ(i);
}
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