/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2004-2012 Cavium, Inc.
*/
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/bitops.h>
#include <linux/percpu.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/smp.h>
#include <linux/of.h>
#include <asm/octeon/octeon.h>
static DEFINE_RAW_SPINLOCK(octeon_irq_ciu0_lock);
static DEFINE_RAW_SPINLOCK(octeon_irq_ciu1_lock);
static DEFINE_PER_CPU(unsigned long, octeon_irq_ciu0_en_mirror);
static DEFINE_PER_CPU(unsigned long, octeon_irq_ciu1_en_mirror);
static __read_mostly u8 octeon_irq_ciu_to_irq[8][64];
union octeon_ciu_chip_data {
void *p;
unsigned long l;
struct {
unsigned int line:6;
unsigned int bit:6;
} s;
};
struct octeon_core_chip_data {
struct mutex core_irq_mutex;
bool current_en;
bool desired_en;
u8 bit;
};
#define MIPS_CORE_IRQ_LINES 8
static struct octeon_core_chip_data octeon_irq_core_chip_data[MIPS_CORE_IRQ_LINES];
static void octeon_irq_set_ciu_mapping(int irq, int line, int bit,
struct irq_chip *chip,
irq_flow_handler_t handler)
{
union octeon_ciu_chip_data cd;
irq_set_chip_and_handler(irq, chip, handler);
cd.l = 0;
cd.s.line = line;
cd.s.bit = bit;
irq_set_chip_data(irq, cd.p);
octeon_irq_ciu_to_irq[line][bit] = irq;
}
static void octeon_irq_force_ciu_mapping(struct irq_domain *domain,
int irq, int line, int bit)
{
irq_domain_associate(domain, irq, line << 6 | bit);
}
static int octeon_coreid_for_cpu(int cpu)
{
#ifdef CONFIG_SMP
return cpu_logical_map(cpu);
#else
return cvmx_get_core_num();
#endif
}
static int octeon_cpu_for_coreid(int coreid)
{
#ifdef CONFIG_SMP
return cpu_number_map(coreid);
#else
return smp_processor_id();
#endif
}
static void octeon_irq_core_ack(struct irq_data *data)
{
struct octeon_core_chip_data *cd = irq_data_get_irq_chip_data(data);
unsigned int bit = cd->bit;
/*
* We don't need to disable IRQs to make these atomic since
* they are already disabled earlier in the low level
* interrupt code.
*/
clear_c0_status(0x100 << bit);
/* The two user interrupts must be cleared manually. */
if (bit < 2)
clear_c0_cause(0x100 << bit);
}
static void octeon_irq_core_eoi(struct irq_data *data)
{
struct octeon_core_chip_data *cd = irq_data_get_irq_chip_data(data);
/*
* We don't need to disable IRQs to make these atomic since
* they are already disabled earlier in the low level
* interrupt code.
*/
set_c0_status(0x100 << cd->bit);
}
static void octeon_irq_core_set_enable_local(void *arg)
{
struct irq_data *data = arg;
struct octeon_core_chip_data *cd = irq_data_get_irq_chip_data(data);
unsigned int mask = 0x100 << cd->bit;
/*
* Interrupts are already disabled, so these are atomic.
*/
if (cd->desired_en)
set_c0_status(mask);
else
clear_c0_status(mask);
}
static void octeon_irq_core_disable(struct irq_data *data)
{
struct octeon_core_chip_data *cd = irq_data_get_irq_chip_data(data);
cd->desired_en = false;
}
static void octeon_irq_core_enable(struct irq_data *data)
{
struct octeon_core_chip_data *cd = irq_data_get_irq_chip_data(data);
cd->desired_en = true;
}
static void octeon_irq_core_bus_lock(struct irq_data *data)
{
struct octeon_core_chip_data *cd = irq_data_get_irq_chip_data(data);
mutex_lock(&cd->core_irq_mutex);
}
static void octeon_irq_core_bus_sync_unlock(struct irq_data *data)
{
struct octeon_core_chip_data *cd = irq_data_get_irq_chip_data(data);
if (cd->desired_en != cd->current_en) {
on_each_cpu(octeon_irq_core_set_enable_local, data, 1);
cd->current_en = cd->desired_en;
}
mutex_unlock(&cd->core_irq_mutex);
}
static struct irq_chip octeon_irq_chip_core = {
.name = "Core",
.irq_enable = octeon_irq_core_enable,
.irq_disable = octeon_irq_core_disable,
.irq_ack = octeon_irq_core_ack,
.irq_eoi = octeon_irq_core_eoi,
.irq_bus_lock = octeon_irq_core_bus_lock,
.irq_bus_sync_unlock = octeon_irq_core_bus_sync_unlock,
.irq_cpu_online = octeon_irq_core_eoi,
.irq_cpu_offline = octeon_irq_core_ack,
.flags = IRQCHIP_ONOFFLINE_ENABLED,
};
static void __init octeon_irq_init_core(void)
{
int i;
int irq;
struct octeon_core_chip_data *cd;
for (i = 0; i < MIPS_CORE_IRQ_LINES; i++) {
cd = &octeon_irq_core_chip_data[i];
cd->current_en = false;
cd->desired_en = false;
cd->bit = i;
mutex_init(&cd->core_irq_mutex);
irq = OCTEON_IRQ_SW0 + i;
irq_set_chip_data(irq, cd);
irq_set_chip_and_handler(irq, &octeon_irq_chip_core,
handle_percpu_irq);
}
}
static int next_cpu_for_irq(struct irq_data *data)
{
#ifdef CONFIG_SMP
int cpu;
int weight = cpumask_weight(data->affinity);
if (weight > 1) {
cpu = smp_processor_id();
for (;;) {
cpu = cpumask_next(cpu, data->affinity);
if (cpu >= nr_cpu_ids) {
cpu = -1;
continue;
} else if (cpumask_test_cpu(cpu, cpu_online_mask)) {
break;
}
}
} else if (weight == 1) {
cpu = cpumask_first(data->affinity);
} else {
cpu = smp_processor_id();
}
return cpu;
#else
return smp_processor_id();
#endif
}
static void octeon_irq_ciu_enable(struct irq_data *data)
{
int cpu = next_cpu_for_irq(data);
int coreid = octeon_coreid_for_cpu(cpu);
unsigned long *pen;
unsigned long flags;
union octeon_ciu_chip_data cd;
cd.p = irq_data_get_irq_chip_data(data);
if (cd.s.line == 0) {
raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags);
pen = &per_cpu(octeon_irq_ciu0_en_mirror, cpu);
set_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), *pen);
raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags);
} else {
raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags);
pen = &per_cpu(octeon_irq_ciu1_en_mirror, cpu);
set_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), *pen);
raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags);
}
}
static void octeon_irq_ciu_enable_local(struct irq_data *data)
{
unsigned long *pen;
unsigned long flags;
union octeon_ciu_chip_data cd;
cd.p = irq_data_get_irq_chip_data(data);
if (cd.s.line == 0) {
raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags);
pen = &__get_cpu_var(octeon_irq_ciu0_en_mirror);
set_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2), *pen);
raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags);
} else {
raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags);
pen = &__get_cpu_var(octeon_irq_ciu1_en_mirror);
set_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1), *pen);
raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags);
}
}
static void octeon_irq_ciu_disable_local(struct irq_data *data)
{
unsigned long *pen;
unsigned long flags;
union octeon_ciu_chip_data cd;
cd.p = irq_data_get_irq_chip_data(data);
if (cd.s.line == 0) {
raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags);
pen = &__get_cpu_var(octeon_irq_ciu0_en_mirror);
clear_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2), *pen);
raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags);
} else {
raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags);
pen = &__get_cpu_var(octeon_irq_ciu1_en_mirror);
clear_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1), *pen);
raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags);
}
}
static void octeon_irq_ciu_disable_all(struct irq_data *data)
{
unsigned long flags;
unsigned long *pen;
int cpu;
union octeon_ciu_chip_data cd;
wmb(); /* Make sure flag changes arrive before register updates. */
cd.p = irq_data_get_irq_chip_data(data);
if (cd.s.line == 0) {
raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags);
for_each_online_cpu(cpu) {
int coreid = octeon_coreid_for_cpu(cpu);
pen = &per_cpu(octeon_irq_ciu0_en_mirror, cpu);
clear_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), *pen);
}
raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags);
} else {
raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags);
for_each_online_cpu(cpu) {
int coreid = octeon_coreid_for_cpu(cpu);
pen = &per_cpu(octeon_irq_ciu1_en_mirror, cpu);
clear_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), *pen);
}
raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags);
}
}
static void octeon_irq_ciu_enable_all(struct irq_data *data)
{
unsigned long flags;
unsigned long *pen;
int cpu;
union octeon_ciu_chip_data cd;
cd.p = irq_data_get_irq_chip_data(data);
if (cd.s.line == 0) {
raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags);
for_each_online_cpu(cpu) {
int coreid = octeon_coreid_for_cpu(cpu);
pen = &per_cpu(octeon_irq_ciu0_en_mirror, cpu);
set_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), *pen);
}
raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags);
} else {
raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags);
for_each_online_cpu(cpu) {
int coreid = octeon_coreid_for_cpu(cpu);
pen = &per_cpu(octeon_irq_ciu1_en_mirror, cpu);
set_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), *pen);
}
raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags);
}
}
/*
* Enable the irq on the next core in the affinity set for chips that
* have the EN*_W1{S,C} registers.
*/
static void octeon_irq_ciu_enable_v2(struct irq_data *data)
{
u64 mask;
int cpu = next_cpu_for_irq(data);
union octeon_ciu_chip_data cd;
cd.p = irq_data_get_irq_chip_data(data);
mask = 1ull << (cd.s.bit);
/*
* Called under the desc lock, so these should never get out
* of sync.
*/
if (cd.s.line == 0) {
int index = octeon_coreid_for_cpu(cpu) * 2;
set_bit(cd.s.bit, &per_cpu(octeon_irq_ciu0_en_mirror, cpu));
cvmx_write_csr(CVMX_CIU_INTX_EN0_W1S(index), mask);
} else {
int index = octeon_coreid_for_cpu(cpu) * 2 + 1;
set_bit(cd.s.bit, &per_cpu(octeon_irq_ciu1_en_mirror, cpu));
cvmx_write_csr(CVMX_CIU_INTX_EN1_W1S(index), mask);
}
}
/*
* Enable the irq on the current CPU for chips that
* have the EN*_W1{S,C} registers.
*/
static void octeon_irq_ciu_enable_local_v2(struct irq_data *data)
{
u64 mask;
union octeon_ciu_chip_data cd;
cd.p = irq_data_get_irq_chip_data(data);
mask = 1ull << (cd.s.bit);
if (cd.s.line == 0) {
int index = cvmx_get_core_num() * 2;
set_bit(cd.s.bit, &__get_cpu_var(octeon_irq_ciu0_en_mirror));
cvmx_write_csr(CVMX_CIU_INTX_EN0_W1S(index), mask);
} else {
int index = cvmx_get_core_num() * 2 + 1;
set_bit(cd.s.bit, &__get_cpu_var(octeon_irq_ciu1_en_mirror));
cvmx_write_csr(CVMX_CIU_INTX_EN1_W1S(index), mask);
}
}
static void octeon_irq_ciu_disable_local_v2(struct irq_data *data)
{
u64 mask;
union octeon_ciu_chip_data cd;
cd.p = irq_data_get_irq_chip_data(data);
mask = 1ull << (cd.s.bit);
if (cd.s.line == 0) {
int index = cvmx_get_core_num() * 2;
clear_bit(cd.s.bit, &__get_cpu_var(octeon_irq_ciu0_en_mirror));
cvmx_write_csr(CVMX_CIU_INTX_EN0_W1C(index), mask);
} else {
int index = cvmx_get_core_num() * 2 + 1;
clear_bit(cd.s.bit, &__get_cpu_var(octeon_irq_ciu1_en_mirror));
cvmx_write_csr(CVMX_CIU_INTX_EN1_W1C(index), mask);
}
}
/*
* Write to the W1C bit in CVMX_CIU_INTX_SUM0 to clear the irq.
*/
static void octeon_irq_ciu_ack(struct irq_data *data)
{
u64 mask;
union octeon_ciu_chip_data cd;
cd.p = data->chip_data;
mask = 1ull << (cd.s.bit);
if (cd.s.line == 0) {
int index = cvmx_get_core_num() * 2;
cvmx_write_csr(CVMX_CIU_INTX_SUM0(index), mask);
} else {
cvmx_write_csr(CVMX_CIU_INT_SUM1, mask);
}
}
/*
* Disable the irq on the all cores for chips that have the EN*_W1{S,C}
* registers.
*/
static void octeon_irq_ciu_disable_all_v2(struct irq_data *data)
{
int cpu;
u64 mask;
union octeon_ciu_chip_data cd;
wmb(); /* Make sure flag changes arrive before register updates. */
cd.p = data->chip_data;
mask = 1ull << (cd.s.bit);
if (cd.s.line == 0) {
for_each_online_cpu(cpu) {
int index = octeon_coreid_for_cpu(cpu) * 2;
clear_bit(cd.s.bit, &per_cpu(octeon_irq_ciu0_en_mirror, cpu));
cvmx_write_csr(CVMX_CIU_INTX_EN0_W1C(index), mask);
}
} else {
for_each_online_cpu(cpu) {
int index = octeon_coreid_for_cpu(cpu) * 2 + 1;
clear_bit(cd.s.bit, &per_cpu(octeon_irq_ciu1_en_mirror, cpu));
cvmx_write_csr(CVMX_CIU_INTX_EN1_W1C(index), mask);
}
}
}
/*
* Enable the irq on the all cores for chips that have the EN*_W1{S,C}
* registers.
*/
static void octeon_irq_ciu_enable_all_v2(struct irq_data *data)
{
int cpu;
u64 mask;
union octeon_ciu_chip_data cd;
cd.p = data->chip_data;
mask = 1ull << (cd.s.bit);
if (cd.s.line == 0) {
for_each_online_cpu(cpu) {
int index = octeon_coreid_for_cpu(cpu) * 2;
set_bit(cd.s.bit, &per_cpu(octeon_irq_ciu0_en_mirror, cpu));
cvmx_write_csr(CVMX_CIU_INTX_EN0_W1S(index), mask);
}
} else {
for_each_online_cpu(cpu) {
int index = octeon_coreid_for_cpu(cpu) * 2 + 1;
set_bit(cd.s.bit, &per_cpu(octeon_irq_ciu1_en_mirror, cpu));
cvmx_write_csr(CVMX_CIU_INTX_EN1_W1S(index), mask);
}
}
}
static void octeon_irq_gpio_setup(struct irq_data *data)
{
union cvmx_gpio_bit_cfgx cfg;
union octeon_ciu_chip_data cd;
u32 t = irqd_get_trigger_type(data);
cd.p = irq_data_get_irq_chip_data(data);
cfg.u64 = 0;
cfg.s.int_en = 1;
cfg.s.int_type = (t & IRQ_TYPE_EDGE_BOTH) != 0;
cfg.s.rx_xor = (t & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING)) != 0;
/* 140 nS glitch filter*/
cfg.s.fil_cnt = 7;
cfg.s.fil_sel = 3;
cvmx_write_csr(CVMX_GPIO_BIT_CFGX(cd.s.bit - 16), cfg.u64);
}
static void octeon_irq_ciu_enable_gpio_v2(struct irq_data *data)
{
octeon_irq_gpio_setup(data);
octeon_irq_ciu_enable_v2(data);
}
static void octeon_irq_ciu_enable_gpio(struct irq_data *data)
{
octeon_irq_gpio_setup(data);
octeon_irq_ciu_enable(data);
}
static int octeon_irq_ciu_gpio_set_type(struct irq_data *data, unsigned int t)
{
irqd_set_trigger_type(data, t);
octeon_irq_gpio_setup(data);
return IRQ_SET_MASK_OK;
}
static void octeon_irq_ciu_disable_gpio_v2(struct irq_data *data)
{
union octeon_ciu_chip_data cd;
cd.p = irq_data_get_irq_chip_data(data);
cvmx_write_csr(CVMX_GPIO_BIT_CFGX(cd.s.bit - 16), 0);
octeon_irq_ciu_disable_all_v2(data);
}
static void octeon_irq_ciu_disable_gpio(struct irq_data *data)
{
union octeon_ciu_chip_data cd;
cd.p = irq_data_get_irq_chip_data(data);
cvmx_write_csr(CVMX_GPIO_BIT_CFGX(cd.s.bit - 16), 0);
octeon_irq_ciu_disable_all(data);
}
static void octeon_irq_ciu_gpio_ack(struct irq_data *data)
{
union octeon_ciu_chip_data cd;
u64 mask;
cd.p = irq_data_get_irq_chip_data(data);
mask = 1ull << (cd.s.bit - 16);
cvmx_write_csr(CVMX_GPIO_INT_CLR, mask);
}
static void octeon_irq_handle_gpio(unsigned int irq, struct irq_desc *desc)
{
if (irqd_get_trigger_type(irq_desc_get_irq_data(desc)) & IRQ_TYPE_EDGE_BOTH)
handle_edge_irq(irq, desc);
else
handle_level_irq(irq, desc);
}
#ifdef CONFIG_SMP
static void octeon_irq_cpu_offline_ciu(struct irq_data *data)
{
int cpu = smp_processor_id();
cpumask_t new_affinity;
if (!cpumask_test_cpu(cpu, data->affinity))
return;
if (cpumask_weight(data->affinity) > 1) {
/*
* It has multi CPU affinity, just remove this CPU
* from the affinity set.
*/
cpumask_copy(&new_affinity, data->affinity);
cpumask_clear_cpu(cpu, &new_affinity);
} else {
/* Otherwise, put it on lowest numbered online CPU. */
cpumask_clear(&new_affinity);
cpumask_set_cpu(cpumask_first(cpu_online_mask), &new_affinity);
}
__irq_set_affinity_locked(data, &new_affinity);
}
static int octeon_irq_ciu_set_affinity(struct irq_data *data,
const struct cpumask *dest, bool force)
{
int cpu;
bool enable_one = !irqd_irq_disabled(data) && !irqd_irq_masked(data);
unsigned long flags;
union octeon_ciu_chip_data cd;
cd.p = data->chip_data;
/*
* For non-v2 CIU, we will allow only single CPU affinity.
* This removes the need to do locking in the .ack/.eoi
* functions.
*/
if (cpumask_weight(dest) != 1)
return -EINVAL;
if (!enable_one)
return 0;
if (cd.s.line == 0) {
raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags);
for_each_online_cpu(cpu) {
int coreid = octeon_coreid_for_cpu(cpu);
unsigned long *pen = &per_cpu(octeon_irq_ciu0_en_mirror, cpu);
if (cpumask_test_cpu(cpu, dest) && enable_one) {
enable_one = false;
set_bit(cd.s.bit, pen);
} else {
clear_bit(cd.s.bit, pen);
}
cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), *pen);
}
raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags);
} else {
raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags);
for_each_online_cpu(cpu) {
int coreid = octeon_coreid_for_cpu(cpu);
unsigned long *pen = &per_cpu(octeon_irq_ciu1_en_mirror, cpu);
if (cpumask_test_cpu(cpu, dest) && enable_one) {
enable_one = false;
set_bit(cd.s.bit, pen);
} else {
clear_bit(cd.s.bit, pen);
}
cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), *pen);
}
raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags);
}
return 0;
}
/*
* Set affinity for the irq for chips that have the EN*_W1{S,C}
* registers.
*/
static int octeon_irq_ciu_set_affinity_v2(struct irq_data *data,
const struct cpumask *dest,
bool force)
{
int cpu;
bool enable_one = !irqd_irq_disabled(data) && !irqd_irq_masked(data);
u64 mask;
union octeon_ciu_chip_data cd;
if (!enable_one)
return 0;
cd.p = data->chip_data;
mask = 1ull << cd.s.bit;
if (cd.s.line == 0) {
for_each_online_cpu(cpu) {
unsigned long *pen = &per_cpu(octeon_irq_ciu0_en_mirror, cpu);
int index = octeon_coreid_for_cpu(cpu) * 2;
if (cpumask_test_cpu(cpu, dest) && enable_one) {
enable_one = false;
set_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN0_W1S(index), mask);
} else {
clear_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN0_W1C(index), mask);
}
}
} else {
for_each_online_cpu(cpu) {
unsigned long *pen = &per_cpu(octeon_irq_ciu1_en_mirror, cpu);
int index = octeon_coreid_for_cpu(cpu) * 2 + 1;
if (cpumask_test_cpu(cpu, dest) && enable_one) {
enable_one = false;
set_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN1_W1S(index), mask);
} else {
clear_bit(cd.s.bit, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN1_W1C(index), mask);
}
}
}
return 0;
}
#endif
/*
* The v1 CIU code already masks things, so supply a dummy version to
* the core chip code.
*/
static void octeon_irq_dummy_mask(struct irq_data *data)
{
}
/*
* Newer octeon chips have support for lockless CIU operation.
*/
static struct irq_chip octeon_irq_chip_ciu_v2 = {
.name = "CIU",
.irq_enable = octeon_irq_ciu_enable_v2,
.irq_disable = octeon_irq_ciu_disable_all_v2,
.irq_ack = octeon_irq_ciu_ack,
.irq_mask = octeon_irq_ciu_disable_local_v2,
.irq_unmask = octeon_irq_ciu_enable_v2,
#ifdef CONFIG_SMP
.irq_set_affinity = octeon_irq_ciu_set_affinity_v2,
.irq_cpu_offline = octeon_irq_cpu_offline_ciu,
#endif
};
static struct irq_chip octeon_irq_chip_ciu = {
.name = "CIU",
.irq_enable = octeon_irq_ciu_enable,
.irq_disable = octeon_irq_ciu_disable_all,
.irq_ack = octeon_irq_ciu_ack,
.irq_mask = octeon_irq_dummy_mask,
#ifdef CONFIG_SMP
.irq_set_affinity = octeon_irq_ciu_set_affinity,
.irq_cpu_offline = octeon_irq_cpu_offline_ciu,
#endif
};
/* The mbox versions don't do any affinity or round-robin. */
static struct irq_chip octeon_irq_chip_ciu_mbox_v2 = {
.name = "CIU-M",
.irq_enable = octeon_irq_ciu_enable_all_v2,
.irq_disable = octeon_irq_ciu_disable_all_v2,
.irq_ack = octeon_irq_ciu_disable_local_v2,
.irq_eoi = octeon_irq_ciu_enable_local_v2,
.irq_cpu_online = octeon_irq_ciu_enable_local_v2,
.irq_cpu_offline = octeon_irq_ciu_disable_local_v2,
.flags = IRQCHIP_ONOFFLINE_ENABLED,
};
static struct irq_chip octeon_irq_chip_ciu_mbox = {
.name = "CIU-M",
.irq_enable = octeon_irq_ciu_enable_all,
.irq_disable = octeon_irq_ciu_disable_all,
.irq_cpu_online = octeon_irq_ciu_enable_local,
.irq_cpu_offline = octeon_irq_ciu_disable_local,
.flags = IRQCHIP_ONOFFLINE_ENABLED,
};
static struct irq_chip octeon_irq_chip_ciu_gpio_v2 = {
.name = "CIU-GPIO",
.irq_enable = octeon_irq_ciu_enable_gpio_v2,
.irq_disable = octeon_irq_ciu_disable_gpio_v2,
.irq_ack = octeon_irq_ciu_gpio_ack,
.irq_mask = octeon_irq_ciu_disable_local_v2,
.irq_unmask = octeon_irq_ciu_enable_v2,
.irq_set_type = octeon_irq_ciu_gpio_set_type,
#ifdef CONFIG_SMP
.irq_set_affinity = octeon_irq_ciu_set_affinity_v2,
#endif
.flags = IRQCHIP_SET_TYPE_MASKED,
};
static struct irq_chip octeon_irq_chip_ciu_gpio = {
.name = "CIU-GPIO",
.irq_enable = octeon_irq_ciu_enable_gpio,
.irq_disable = octeon_irq_ciu_disable_gpio,
.irq_mask = octeon_irq_dummy_mask,
.irq_ack = octeon_irq_ciu_gpio_ack,
.irq_set_type = octeon_irq_ciu_gpio_set_type,
#ifdef CONFIG_SMP
.irq_set_affinity = octeon_irq_ciu_set_affinity,
#endif
.flags = IRQCHIP_SET_TYPE_MASKED,
};
/*
* Watchdog interrupts are special. They are associated with a single
* core, so we hardwire the affinity to that core.
*/
static void octeon_irq_ciu_wd_enable(struct irq_data *data)
{
unsigned long flags;
unsigned long *pen;
int coreid = data->irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */
int cpu = octeon_cpu_for_coreid(coreid);
raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags);
pen = &per_cpu(octeon_irq_ciu1_en_mirror, cpu);
set_bit(coreid, pen);
cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), *pen);
raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags);
}
/*
* Watchdog interrupts are special. They are associated with a single
* core, so we hardwire the affinity to that core.
*/
static void octeon_irq_ciu1_wd_enable_v2(struct irq_data *data)
{
int coreid = data->irq - OCTEON_IRQ_WDOG0;
int cpu = octeon_cpu_for_coreid(coreid);
set_bit(coreid, &per_cpu(octeon_irq_ciu1_en_mirror, cpu));
cvmx_write_csr(CVMX_CIU_INTX_EN1_W1S(coreid * 2 + 1), 1ull << coreid);
}
static struct irq_chip octeon_irq_chip_ciu_wd_v2 = {
.name = "CIU-W",
.irq_enable = octeon_irq_ciu1_wd_enable_v2,
.irq_disable = octeon_irq_ciu_disable_all_v2,
.irq_mask = octeon_irq_ciu_disable_local_v2,
.irq_unmask = octeon_irq_ciu_enable_local_v2,
};
static struct irq_chip octeon_irq_chip_ciu_wd = {
.name = "CIU-W",
.irq_enable = octeon_irq_ciu_wd_enable,
.irq_disable = octeon_irq_ciu_disable_all,
.irq_mask = octeon_irq_dummy_mask,
};
static bool octeon_irq_ciu_is_edge(unsigned int line, unsigned int bit)
{
bool edge = false;
if (line == 0)
switch (bit) {
case 48 ... 49: /* GMX DRP */
case 50: /* IPD_DRP */
case 52 ... 55: /* Timers */
case 58: /* MPI */
edge = true;
break;
default:
break;
}
else /* line == 1 */
switch (bit) {
case 47: /* PTP */
edge = true;
break;
default:
break;
}
return edge;
}
struct octeon_irq_gpio_domain_data {
unsigned int base_hwirq;
};
static int octeon_irq_gpio_xlat(struct irq_domain *d,
struct device_node *node,
const u32 *intspec,
unsigned int intsize,
unsigned long *out_hwirq,
unsigned int *out_type)
{
unsigned int type;
unsigned int pin;
unsigned int trigger;
if (d->of_node != node)
return -EINVAL;
if (intsize < 2)
return -EINVAL;
pin = intspec[0];
if (pin >= 16)
return -EINVAL;
trigger = intspec[1];
switch (trigger) {
case 1:
type = IRQ_TYPE_EDGE_RISING;
break;
case 2:
type = IRQ_TYPE_EDGE_FALLING;
break;
case 4:
type = IRQ_TYPE_LEVEL_HIGH;
break;
case 8:
type = IRQ_TYPE_LEVEL_LOW;
break;
default:
pr_err("Error: (%s) Invalid irq trigger specification: %x\n",
node->name,
trigger);
type = IRQ_TYPE_LEVEL_LOW;
break;
}
*out_type = type;
*out_hwirq = pin;
return 0;
}
static int octeon_irq_ciu_xlat(struct irq_domain *d,
struct device_node *node,
const u32 *intspec,
unsigned int intsize,
unsigned long *out_hwirq,
unsigned int *out_type)
{
unsigned int ciu, bit;
ciu = intspec[0];
bit = intspec[1];
if (ciu > 1 || bit > 63)
return -EINVAL;
/* These are the GPIO lines */
if (ciu == 0 && bit >= 16 && bit < 32)
return -EINVAL;
*out_hwirq = (ciu << 6) | bit;
*out_type = 0;
return 0;
}
static struct irq_chip *octeon_irq_ciu_chip;
static struct irq_chip *octeon_irq_gpio_chip;
static bool octeon_irq_virq_in_range(unsigned int virq)
{
/* We cannot let it overflow the mapping array. */
if (virq < (1ul << 8 * sizeof(octeon_irq_ciu_to_irq[0][0])))
return true;
WARN_ONCE(true, "virq out of range %u.\n", virq);
return false;
}
static int octeon_irq_ciu_map(struct irq_domain *d,
unsigned int virq, irq_hw_number_t hw)
{
unsigned int line = hw >> 6;
unsigned int bit = hw & 63;
if (!octeon_irq_virq_in_range(virq))
return -EINVAL;
if (line > 1 || octeon_irq_ciu_to_irq[line][bit] != 0)
return -EINVAL;
if (octeon_irq_ciu_is_edge(line, bit))
octeon_irq_set_ciu_mapping(virq, line, bit,
octeon_irq_ciu_chip,
handle_edge_irq);
else
octeon_irq_set_ciu_mapping(virq, line, bit,
octeon_irq_ciu_chip,
handle_level_irq);
return 0;
}
static int octeon_irq_gpio_map(struct irq_domain *d,
unsigned int virq, irq_hw_number_t hw)
{
struct octeon_irq_gpio_domain_data *gpiod = d->host_data;
unsigned int line, bit;
if (!octeon_irq_virq_in_range(virq))
return -EINVAL;
hw += gpiod->base_hwirq;
line = hw >> 6;
bit = hw & 63;
if (line > 1 || octeon_irq_ciu_to_irq[line][bit] != 0)
return -EINVAL;
octeon_irq_set_ciu_mapping(virq, line, bit,
octeon_irq_gpio_chip,
octeon_irq_handle_gpio);
return 0;
}
static struct irq_domain_ops octeon_irq_domain_ciu_ops = {
.map = octeon_irq_ciu_map,
.xlate = octeon_irq_ciu_xlat,
};
static struct irq_domain_ops octeon_irq_domain_gpio_ops = {
.map = octeon_irq_gpio_map,
.xlate = octeon_irq_gpio_xlat,
};
static void octeon_irq_ip2_v1(void)
{
const unsigned long core_id = cvmx_get_core_num();
u64 ciu_sum = cvmx_read_csr(CVMX_CIU_INTX_SUM0(core_id * 2));
ciu_sum &= __get_cpu_var(octeon_irq_ciu0_en_mirror);
clear_c0_status(STATUSF_IP2);
if (likely(ciu_sum)) {
int bit = fls64(ciu_sum) - 1;
int irq = octeon_irq_ciu_to_irq[0][bit];
if (likely(irq))
do_IRQ(irq);
else
spurious_interrupt();
} else {
spurious_interrupt();
}
set_c0_status(STATUSF_IP2);
}
static void octeon_irq_ip2_v2(void)
{
const unsigned long core_id = cvmx_get_core_num();
u64 ciu_sum = cvmx_read_csr(CVMX_CIU_INTX_SUM0(core_id * 2));
ciu_sum &= __get_cpu_var(octeon_irq_ciu0_en_mirror);
if (likely(ciu_sum)) {
int bit = fls64(ciu_sum) - 1;
int irq = octeon_irq_ciu_to_irq[0][bit];
if (likely(irq))
do_IRQ(irq);
else
spurious_interrupt();
} else {
spurious_interrupt();
}
}
static void octeon_irq_ip3_v1(void)
{
u64 ciu_sum = cvmx_read_csr(CVMX_CIU_INT_SUM1);
ciu_sum &= __get_cpu_var(octeon_irq_ciu1_en_mirror);
clear_c0_status(STATUSF_IP3);
if (likely(ciu_sum)) {
int bit = fls64(ciu_sum) - 1;
int irq = octeon_irq_ciu_to_irq[1][bit];
if (likely(irq))
do_IRQ(irq);
else
spurious_interrupt();
} else {
spurious_interrupt();
}
set_c0_status(STATUSF_IP3);
}
static void octeon_irq_ip3_v2(void)
{
u64 ciu_sum = cvmx_read_csr(CVMX_CIU_INT_SUM1);
ciu_sum &= __get_cpu_var(octeon_irq_ciu1_en_mirror);
if (likely(ciu_sum)) {
int bit = fls64(ciu_sum) - 1;
int irq = octeon_irq_ciu_to_irq[1][bit];
if (likely(irq))
do_IRQ(irq);
else
spurious_interrupt();
} else {
spurious_interrupt();
}
}
static void octeon_irq_ip4_mask(void)
{
clear_c0_status(STATUSF_IP4);
spurious_interrupt();
}
static void (*octeon_irq_ip2)(void);
static void (*octeon_irq_ip3)(void);
static void (*octeon_irq_ip4)(void);
void __cpuinitdata (*octeon_irq_setup_secondary)(void);
static void __cpuinit octeon_irq_percpu_enable(void)
{
irq_cpu_online();
}
static void __cpuinit octeon_irq_init_ciu_percpu(void)
{
int coreid = cvmx_get_core_num();
/*
* Disable All CIU Interrupts. The ones we need will be
* enabled later. Read the SUM register so we know the write
* completed.
*/
cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2)), 0);
cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2 + 1)), 0);
cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2)), 0);
cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2 + 1)), 0);
cvmx_read_csr(CVMX_CIU_INTX_SUM0((coreid * 2)));
}
static void __cpuinit octeon_irq_setup_secondary_ciu(void)
{
__get_cpu_var(octeon_irq_ciu0_en_mirror) = 0;
__get_cpu_var(octeon_irq_ciu1_en_mirror) = 0;
octeon_irq_init_ciu_percpu();
octeon_irq_percpu_enable();
/* Enable the CIU lines */
set_c0_status(STATUSF_IP3 | STATUSF_IP2);
clear_c0_status(STATUSF_IP4);
}
static void __init octeon_irq_init_ciu(void)
{
unsigned int i;
struct irq_chip *chip;
struct irq_chip *chip_mbox;
struct irq_chip *chip_wd;
struct device_node *gpio_node;
struct device_node *ciu_node;
struct irq_domain *ciu_domain = NULL;
octeon_irq_init_ciu_percpu();
octeon_irq_setup_secondary = octeon_irq_setup_secondary_ciu;
if (OCTEON_IS_MODEL(OCTEON_CN58XX_PASS2_X) ||
OCTEON_IS_MODEL(OCTEON_CN56XX_PASS2_X) ||
OCTEON_IS_MODEL(OCTEON_CN52XX_PASS2_X) ||
OCTEON_IS_MODEL(OCTEON_CN6XXX)) {
octeon_irq_ip2 = octeon_irq_ip2_v2;
octeon_irq_ip3 = octeon_irq_ip3_v2;
chip = &octeon_irq_chip_ciu_v2;
chip_mbox = &octeon_irq_chip_ciu_mbox_v2;
chip_wd = &octeon_irq_chip_ciu_wd_v2;
octeon_irq_gpio_chip = &octeon_irq_chip_ciu_gpio_v2;
} else {
octeon_irq_ip2 = octeon_irq_ip2_v1;
octeon_irq_ip3 = octeon_irq_ip3_v1;
chip = &octeon_irq_chip_ciu;
chip_mbox = &octeon_irq_chip_ciu_mbox;
chip_wd = &octeon_irq_chip_ciu_wd;
octeon_irq_gpio_chip = &octeon_irq_chip_ciu_gpio;
}
octeon_irq_ciu_chip = chip;
octeon_irq_ip4 = octeon_irq_ip4_mask;
/* Mips internal */
octeon_irq_init_core();
gpio_node = of_find_compatible_node(NULL, NULL, "cavium,octeon-3860-gpio");
if (gpio_node) {
struct octeon_irq_gpio_domain_data *gpiod;
gpiod = kzalloc(sizeof(*gpiod), GFP_KERNEL);
if (gpiod) {
/* gpio domain host_data is the base hwirq number. */
gpiod->base_hwirq = 16;
irq_domain_add_linear(gpio_node, 16, &octeon_irq_domain_gpio_ops, gpiod);
of_node_put(gpio_node);
} else
pr_warn("Cannot allocate memory for GPIO irq_domain.\n");
} else
pr_warn("Cannot find device node for cavium,octeon-3860-gpio.\n");
ciu_node = of_find_compatible_node(NULL, NULL, "cavium,octeon-3860-ciu");
if (ciu_node) {
ciu_domain = irq_domain_add_tree(ciu_node, &octeon_irq_domain_ciu_ops, NULL);
of_node_put(ciu_node);
} else
panic("Cannot find device node for cavium,octeon-3860-ciu.");
/* CIU_0 */
for (i = 0; i < 16; i++)
octeon_irq_force_ciu_mapping(ciu_domain, i + OCTEON_IRQ_WORKQ0, 0, i + 0);
octeon_irq_set_ciu_mapping(OCTEON_IRQ_MBOX0, 0, 32, chip_mbox, handle_percpu_irq);
octeon_irq_set_ciu_mapping(OCTEON_IRQ_MBOX1, 0, 33, chip_mbox, handle_percpu_irq);
for (i = 0; i < 4; i++)
octeon_irq_force_ciu_mapping(ciu_domain, i + OCTEON_IRQ_PCI_INT0, 0, i + 36);
for (i = 0; i < 4; i++)
octeon_irq_force_ciu_mapping(ciu_domain, i + OCTEON_IRQ_PCI_MSI0, 0, i + 40);
octeon_irq_force_ciu_mapping(ciu_domain, OCTEON_IRQ_RML, 0, 46);
for (i = 0; i < 4; i++)
octeon_irq_force_ciu_mapping(ciu_domain, i + OCTEON_IRQ_TIMER0, 0, i + 52);
octeon_irq_force_ciu_mapping(ciu_domain, OCTEON_IRQ_USB0, 0, 56);
octeon_irq_force_ciu_mapping(ciu_domain, OCTEON_IRQ_BOOTDMA, 0, 63);
/* CIU_1 */
for (i = 0; i < 16; i++)
octeon_irq_set_ciu_mapping(i + OCTEON_IRQ_WDOG0, 1, i + 0, chip_wd, handle_level_irq);
octeon_irq_force_ciu_mapping(ciu_domain, OCTEON_IRQ_USB1, 1, 17);
/* Enable the CIU lines */
set_c0_status(STATUSF_IP3 | STATUSF_IP2);
clear_c0_status(STATUSF_IP4);
}
void __init arch_init_irq(void)
{
#ifdef CONFIG_SMP
/* Set the default affinity to the boot cpu. */
cpumask_clear(irq_default_affinity);
cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
#endif
octeon_irq_init_ciu();
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned long cop0_cause;
unsigned long cop0_status;
while (1) {
cop0_cause = read_c0_cause();
cop0_status = read_c0_status();
cop0_cause &= cop0_status;
cop0_cause &= ST0_IM;
if (unlikely(cop0_cause & STATUSF_IP2))
octeon_irq_ip2();
else if (unlikely(cop0_cause & STATUSF_IP3))
octeon_irq_ip3();
else if (unlikely(cop0_cause & STATUSF_IP4))
octeon_irq_ip4();
else if (likely(cop0_cause))
do_IRQ(fls(cop0_cause) - 9 + MIPS_CPU_IRQ_BASE);
else
break;
}
}
#ifdef CONFIG_HOTPLUG_CPU
void fixup_irqs(void)
{
irq_cpu_offline();
}
#endif /* CONFIG_HOTPLUG_CPU */