linux/drivers/irqchip/irq-mips-gic.c
Marcin Nowakowski 4cfffcfa51 irqchip/mips-gic: Fix local interrupts
Some local interrupts are not initialised properly at the moment and
cannot be used since the domain's alloc method is never called for them.

This has been observed earlier and partially fixed in commit
e875bd66df ("irqchip/mips-gic: Fix local interrupts"), but that change
still relied on the interrupt to be requested by an external driver (eg.
drivers/clocksource/mips-gic-timer.c).

This does however not solve the issue for interrupts that are not
referenced by any driver through the device tree and results in
request_irq() calls returning -ENOSYS. It can be observed when attempting
to use perf tool to access hardware performance counters.

Fix this by explicitly calling irq_create_fwspec_mapping() for local
interrupts.

Fixes: e875bd66df ("irqchip/mips-gic: Fix local interrupts")
Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-mips@linux-mips.org
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08 14:25:50 +00:00

1156 lines
28 KiB
C

/*
* 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) 2008 Ralf Baechle (ralf@linux-mips.org)
* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
*/
#include <linux/bitmap.h>
#include <linux/clocksource.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqchip/mips-gic.h>
#include <linux/of_address.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <asm/mips-cm.h>
#include <asm/setup.h>
#include <asm/traps.h>
#include <dt-bindings/interrupt-controller/mips-gic.h>
unsigned int gic_present;
struct gic_pcpu_mask {
DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS);
};
struct gic_irq_spec {
enum {
GIC_DEVICE,
GIC_IPI
} type;
union {
struct cpumask *ipimask;
unsigned int hwirq;
};
};
static unsigned long __gic_base_addr;
static void __iomem *gic_base;
static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
static DEFINE_SPINLOCK(gic_lock);
static struct irq_domain *gic_irq_domain;
static struct irq_domain *gic_dev_domain;
static struct irq_domain *gic_ipi_domain;
static int gic_shared_intrs;
static int gic_vpes;
static unsigned int gic_cpu_pin;
static unsigned int timer_cpu_pin;
static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller;
DECLARE_BITMAP(ipi_resrv, GIC_MAX_INTRS);
static void __gic_irq_dispatch(void);
static inline u32 gic_read32(unsigned int reg)
{
return __raw_readl(gic_base + reg);
}
static inline u64 gic_read64(unsigned int reg)
{
return __raw_readq(gic_base + reg);
}
static inline unsigned long gic_read(unsigned int reg)
{
if (!mips_cm_is64)
return gic_read32(reg);
else
return gic_read64(reg);
}
static inline void gic_write32(unsigned int reg, u32 val)
{
return __raw_writel(val, gic_base + reg);
}
static inline void gic_write64(unsigned int reg, u64 val)
{
return __raw_writeq(val, gic_base + reg);
}
static inline void gic_write(unsigned int reg, unsigned long val)
{
if (!mips_cm_is64)
return gic_write32(reg, (u32)val);
else
return gic_write64(reg, (u64)val);
}
static inline void gic_update_bits(unsigned int reg, unsigned long mask,
unsigned long val)
{
unsigned long regval;
regval = gic_read(reg);
regval &= ~mask;
regval |= val;
gic_write(reg, regval);
}
static inline void gic_reset_mask(unsigned int intr)
{
gic_write(GIC_REG(SHARED, GIC_SH_RMASK) + GIC_INTR_OFS(intr),
1ul << GIC_INTR_BIT(intr));
}
static inline void gic_set_mask(unsigned int intr)
{
gic_write(GIC_REG(SHARED, GIC_SH_SMASK) + GIC_INTR_OFS(intr),
1ul << GIC_INTR_BIT(intr));
}
static inline void gic_set_polarity(unsigned int intr, unsigned int pol)
{
gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_POLARITY) +
GIC_INTR_OFS(intr), 1ul << GIC_INTR_BIT(intr),
(unsigned long)pol << GIC_INTR_BIT(intr));
}
static inline void gic_set_trigger(unsigned int intr, unsigned int trig)
{
gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_TRIGGER) +
GIC_INTR_OFS(intr), 1ul << GIC_INTR_BIT(intr),
(unsigned long)trig << GIC_INTR_BIT(intr));
}
static inline void gic_set_dual_edge(unsigned int intr, unsigned int dual)
{
gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_DUAL) + GIC_INTR_OFS(intr),
1ul << GIC_INTR_BIT(intr),
(unsigned long)dual << GIC_INTR_BIT(intr));
}
static inline void gic_map_to_pin(unsigned int intr, unsigned int pin)
{
gic_write32(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_PIN_BASE) +
GIC_SH_MAP_TO_PIN(intr), GIC_MAP_TO_PIN_MSK | pin);
}
static inline void gic_map_to_vpe(unsigned int intr, unsigned int vpe)
{
gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_VPE_BASE) +
GIC_SH_MAP_TO_VPE_REG_OFF(intr, vpe),
GIC_SH_MAP_TO_VPE_REG_BIT(vpe));
}
#ifdef CONFIG_CLKSRC_MIPS_GIC
u64 gic_read_count(void)
{
unsigned int hi, hi2, lo;
if (mips_cm_is64)
return (u64)gic_read(GIC_REG(SHARED, GIC_SH_COUNTER));
do {
hi = gic_read32(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
lo = gic_read32(GIC_REG(SHARED, GIC_SH_COUNTER_31_00));
hi2 = gic_read32(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
} while (hi2 != hi);
return (((u64) hi) << 32) + lo;
}
unsigned int gic_get_count_width(void)
{
unsigned int bits, config;
config = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
bits = 32 + 4 * ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >>
GIC_SH_CONFIG_COUNTBITS_SHF);
return bits;
}
void gic_write_compare(u64 cnt)
{
if (mips_cm_is64) {
gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE), cnt);
} else {
gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI),
(int)(cnt >> 32));
gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO),
(int)(cnt & 0xffffffff));
}
}
void gic_write_cpu_compare(u64 cnt, int cpu)
{
unsigned long flags;
local_irq_save(flags);
gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), mips_cm_vp_id(cpu));
if (mips_cm_is64) {
gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE), cnt);
} else {
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI),
(int)(cnt >> 32));
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO),
(int)(cnt & 0xffffffff));
}
local_irq_restore(flags);
}
u64 gic_read_compare(void)
{
unsigned int hi, lo;
if (mips_cm_is64)
return (u64)gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE));
hi = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI));
lo = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO));
return (((u64) hi) << 32) + lo;
}
void gic_start_count(void)
{
u32 gicconfig;
/* Start the counter */
gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
gicconfig &= ~(1 << GIC_SH_CONFIG_COUNTSTOP_SHF);
gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
}
void gic_stop_count(void)
{
u32 gicconfig;
/* Stop the counter */
gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
gicconfig |= 1 << GIC_SH_CONFIG_COUNTSTOP_SHF;
gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
}
#endif
unsigned gic_read_local_vp_id(void)
{
unsigned long ident;
ident = gic_read(GIC_REG(VPE_LOCAL, GIC_VP_IDENT));
return ident & GIC_VP_IDENT_VCNUM_MSK;
}
static bool gic_local_irq_is_routable(int intr)
{
u32 vpe_ctl;
/* All local interrupts are routable in EIC mode. */
if (cpu_has_veic)
return true;
vpe_ctl = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_CTL));
switch (intr) {
case GIC_LOCAL_INT_TIMER:
return vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK;
case GIC_LOCAL_INT_PERFCTR:
return vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK;
case GIC_LOCAL_INT_FDC:
return vpe_ctl & GIC_VPE_CTL_FDC_RTBL_MSK;
case GIC_LOCAL_INT_SWINT0:
case GIC_LOCAL_INT_SWINT1:
return vpe_ctl & GIC_VPE_CTL_SWINT_RTBL_MSK;
default:
return true;
}
}
static void gic_bind_eic_interrupt(int irq, int set)
{
/* Convert irq vector # to hw int # */
irq -= GIC_PIN_TO_VEC_OFFSET;
/* Set irq to use shadow set */
gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_EIC_SHADOW_SET_BASE) +
GIC_VPE_EIC_SS(irq), set);
}
static void gic_send_ipi(struct irq_data *d, unsigned int cpu)
{
irq_hw_number_t hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(d));
gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_SET(hwirq));
}
int gic_get_c0_compare_int(void)
{
if (!gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER))
return MIPS_CPU_IRQ_BASE + cp0_compare_irq;
return irq_create_mapping(gic_irq_domain,
GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_TIMER));
}
int gic_get_c0_perfcount_int(void)
{
if (!gic_local_irq_is_routable(GIC_LOCAL_INT_PERFCTR)) {
/* Is the performance counter shared with the timer? */
if (cp0_perfcount_irq < 0)
return -1;
return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
}
return irq_create_mapping(gic_irq_domain,
GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR));
}
int gic_get_c0_fdc_int(void)
{
if (!gic_local_irq_is_routable(GIC_LOCAL_INT_FDC)) {
/* Is the FDC IRQ even present? */
if (cp0_fdc_irq < 0)
return -1;
return MIPS_CPU_IRQ_BASE + cp0_fdc_irq;
}
return irq_create_mapping(gic_irq_domain,
GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_FDC));
}
int gic_get_usm_range(struct resource *gic_usm_res)
{
if (!gic_present)
return -1;
gic_usm_res->start = __gic_base_addr + USM_VISIBLE_SECTION_OFS;
gic_usm_res->end = gic_usm_res->start + (USM_VISIBLE_SECTION_SIZE - 1);
return 0;
}
static void gic_handle_shared_int(bool chained)
{
unsigned int i, intr, virq, gic_reg_step = mips_cm_is64 ? 8 : 4;
unsigned long *pcpu_mask;
unsigned long pending_reg, intrmask_reg;
DECLARE_BITMAP(pending, GIC_MAX_INTRS);
DECLARE_BITMAP(intrmask, GIC_MAX_INTRS);
/* Get per-cpu bitmaps */
pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask;
pending_reg = GIC_REG(SHARED, GIC_SH_PEND);
intrmask_reg = GIC_REG(SHARED, GIC_SH_MASK);
for (i = 0; i < BITS_TO_LONGS(gic_shared_intrs); i++) {
pending[i] = gic_read(pending_reg);
intrmask[i] = gic_read(intrmask_reg);
pending_reg += gic_reg_step;
intrmask_reg += gic_reg_step;
if (!IS_ENABLED(CONFIG_64BIT) || mips_cm_is64)
continue;
pending[i] |= (u64)gic_read(pending_reg) << 32;
intrmask[i] |= (u64)gic_read(intrmask_reg) << 32;
pending_reg += gic_reg_step;
intrmask_reg += gic_reg_step;
}
bitmap_and(pending, pending, intrmask, gic_shared_intrs);
bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs);
for_each_set_bit(intr, pending, gic_shared_intrs) {
virq = irq_linear_revmap(gic_irq_domain,
GIC_SHARED_TO_HWIRQ(intr));
if (chained)
generic_handle_irq(virq);
else
do_IRQ(virq);
}
}
static void gic_mask_irq(struct irq_data *d)
{
gic_reset_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
}
static void gic_unmask_irq(struct irq_data *d)
{
gic_set_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
}
static void gic_ack_irq(struct irq_data *d)
{
unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_CLR(irq));
}
static int gic_set_type(struct irq_data *d, unsigned int type)
{
unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
unsigned long flags;
bool is_edge;
spin_lock_irqsave(&gic_lock, flags);
switch (type & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_FALLING:
gic_set_polarity(irq, GIC_POL_NEG);
gic_set_trigger(irq, GIC_TRIG_EDGE);
gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
is_edge = true;
break;
case IRQ_TYPE_EDGE_RISING:
gic_set_polarity(irq, GIC_POL_POS);
gic_set_trigger(irq, GIC_TRIG_EDGE);
gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
is_edge = true;
break;
case IRQ_TYPE_EDGE_BOTH:
/* polarity is irrelevant in this case */
gic_set_trigger(irq, GIC_TRIG_EDGE);
gic_set_dual_edge(irq, GIC_TRIG_DUAL_ENABLE);
is_edge = true;
break;
case IRQ_TYPE_LEVEL_LOW:
gic_set_polarity(irq, GIC_POL_NEG);
gic_set_trigger(irq, GIC_TRIG_LEVEL);
gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
is_edge = false;
break;
case IRQ_TYPE_LEVEL_HIGH:
default:
gic_set_polarity(irq, GIC_POL_POS);
gic_set_trigger(irq, GIC_TRIG_LEVEL);
gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
is_edge = false;
break;
}
if (is_edge)
irq_set_chip_handler_name_locked(d, &gic_edge_irq_controller,
handle_edge_irq, NULL);
else
irq_set_chip_handler_name_locked(d, &gic_level_irq_controller,
handle_level_irq, NULL);
spin_unlock_irqrestore(&gic_lock, flags);
return 0;
}
#ifdef CONFIG_SMP
static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
bool force)
{
unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
cpumask_t tmp = CPU_MASK_NONE;
unsigned long flags;
int i;
cpumask_and(&tmp, cpumask, cpu_online_mask);
if (cpumask_empty(&tmp))
return -EINVAL;
/* Assumption : cpumask refers to a single CPU */
spin_lock_irqsave(&gic_lock, flags);
/* Re-route this IRQ */
gic_map_to_vpe(irq, mips_cm_vp_id(cpumask_first(&tmp)));
/* Update the pcpu_masks */
for (i = 0; i < min(gic_vpes, NR_CPUS); i++)
clear_bit(irq, pcpu_masks[i].pcpu_mask);
set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask);
cpumask_copy(irq_data_get_affinity_mask(d), cpumask);
spin_unlock_irqrestore(&gic_lock, flags);
return IRQ_SET_MASK_OK_NOCOPY;
}
#endif
static struct irq_chip gic_level_irq_controller = {
.name = "MIPS GIC",
.irq_mask = gic_mask_irq,
.irq_unmask = gic_unmask_irq,
.irq_set_type = gic_set_type,
#ifdef CONFIG_SMP
.irq_set_affinity = gic_set_affinity,
#endif
};
static struct irq_chip gic_edge_irq_controller = {
.name = "MIPS GIC",
.irq_ack = gic_ack_irq,
.irq_mask = gic_mask_irq,
.irq_unmask = gic_unmask_irq,
.irq_set_type = gic_set_type,
#ifdef CONFIG_SMP
.irq_set_affinity = gic_set_affinity,
#endif
.ipi_send_single = gic_send_ipi,
};
static void gic_handle_local_int(bool chained)
{
unsigned long pending, masked;
unsigned int intr, virq;
pending = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_PEND));
masked = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_MASK));
bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS);
for_each_set_bit(intr, &pending, GIC_NUM_LOCAL_INTRS) {
virq = irq_linear_revmap(gic_irq_domain,
GIC_LOCAL_TO_HWIRQ(intr));
if (chained)
generic_handle_irq(virq);
else
do_IRQ(virq);
}
}
static void gic_mask_local_irq(struct irq_data *d)
{
int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK), 1 << intr);
}
static void gic_unmask_local_irq(struct irq_data *d)
{
int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), 1 << intr);
}
static struct irq_chip gic_local_irq_controller = {
.name = "MIPS GIC Local",
.irq_mask = gic_mask_local_irq,
.irq_unmask = gic_unmask_local_irq,
};
static void gic_mask_local_irq_all_vpes(struct irq_data *d)
{
int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
int i;
unsigned long flags;
spin_lock_irqsave(&gic_lock, flags);
for (i = 0; i < gic_vpes; i++) {
gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR),
mips_cm_vp_id(i));
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << intr);
}
spin_unlock_irqrestore(&gic_lock, flags);
}
static void gic_unmask_local_irq_all_vpes(struct irq_data *d)
{
int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
int i;
unsigned long flags;
spin_lock_irqsave(&gic_lock, flags);
for (i = 0; i < gic_vpes; i++) {
gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR),
mips_cm_vp_id(i));
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_SMASK), 1 << intr);
}
spin_unlock_irqrestore(&gic_lock, flags);
}
static struct irq_chip gic_all_vpes_local_irq_controller = {
.name = "MIPS GIC Local",
.irq_mask = gic_mask_local_irq_all_vpes,
.irq_unmask = gic_unmask_local_irq_all_vpes,
};
static void __gic_irq_dispatch(void)
{
gic_handle_local_int(false);
gic_handle_shared_int(false);
}
static void gic_irq_dispatch(struct irq_desc *desc)
{
gic_handle_local_int(true);
gic_handle_shared_int(true);
}
static void __init gic_basic_init(void)
{
unsigned int i;
board_bind_eic_interrupt = &gic_bind_eic_interrupt;
/* Setup defaults */
for (i = 0; i < gic_shared_intrs; i++) {
gic_set_polarity(i, GIC_POL_POS);
gic_set_trigger(i, GIC_TRIG_LEVEL);
gic_reset_mask(i);
}
for (i = 0; i < gic_vpes; i++) {
unsigned int j;
gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR),
mips_cm_vp_id(i));
for (j = 0; j < GIC_NUM_LOCAL_INTRS; j++) {
if (!gic_local_irq_is_routable(j))
continue;
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << j);
}
}
}
static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hw)
{
int intr = GIC_HWIRQ_TO_LOCAL(hw);
int ret = 0;
int i;
unsigned long flags;
if (!gic_local_irq_is_routable(intr))
return -EPERM;
spin_lock_irqsave(&gic_lock, flags);
for (i = 0; i < gic_vpes; i++) {
u32 val = GIC_MAP_TO_PIN_MSK | gic_cpu_pin;
gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR),
mips_cm_vp_id(i));
switch (intr) {
case GIC_LOCAL_INT_WD:
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_WD_MAP), val);
break;
case GIC_LOCAL_INT_COMPARE:
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_MAP),
val);
break;
case GIC_LOCAL_INT_TIMER:
/* CONFIG_MIPS_CMP workaround (see __gic_init) */
val = GIC_MAP_TO_PIN_MSK | timer_cpu_pin;
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP),
val);
break;
case GIC_LOCAL_INT_PERFCTR:
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP),
val);
break;
case GIC_LOCAL_INT_SWINT0:
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_SWINT0_MAP),
val);
break;
case GIC_LOCAL_INT_SWINT1:
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_SWINT1_MAP),
val);
break;
case GIC_LOCAL_INT_FDC:
gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_FDC_MAP), val);
break;
default:
pr_err("Invalid local IRQ %d\n", intr);
ret = -EINVAL;
break;
}
}
spin_unlock_irqrestore(&gic_lock, flags);
return ret;
}
static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hw, unsigned int vpe)
{
int intr = GIC_HWIRQ_TO_SHARED(hw);
unsigned long flags;
int i;
spin_lock_irqsave(&gic_lock, flags);
gic_map_to_pin(intr, gic_cpu_pin);
gic_map_to_vpe(intr, mips_cm_vp_id(vpe));
for (i = 0; i < min(gic_vpes, NR_CPUS); i++)
clear_bit(intr, pcpu_masks[i].pcpu_mask);
set_bit(intr, pcpu_masks[vpe].pcpu_mask);
spin_unlock_irqrestore(&gic_lock, flags);
return 0;
}
static int gic_setup_dev_chip(struct irq_domain *d, unsigned int virq,
unsigned int hwirq)
{
struct irq_chip *chip;
int err;
if (hwirq >= GIC_SHARED_HWIRQ_BASE) {
err = irq_domain_set_hwirq_and_chip(d, virq, hwirq,
&gic_level_irq_controller,
NULL);
} else {
switch (GIC_HWIRQ_TO_LOCAL(hwirq)) {
case GIC_LOCAL_INT_TIMER:
case GIC_LOCAL_INT_PERFCTR:
case GIC_LOCAL_INT_FDC:
/*
* HACK: These are all really percpu interrupts, but
* the rest of the MIPS kernel code does not use the
* percpu IRQ API for them.
*/
chip = &gic_all_vpes_local_irq_controller;
irq_set_handler(virq, handle_percpu_irq);
break;
default:
chip = &gic_local_irq_controller;
irq_set_handler(virq, handle_percpu_devid_irq);
irq_set_percpu_devid(virq);
break;
}
err = irq_domain_set_hwirq_and_chip(d, virq, hwirq,
chip, NULL);
}
return err;
}
static int gic_irq_domain_alloc(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
struct gic_irq_spec *spec = arg;
irq_hw_number_t hwirq, base_hwirq;
int cpu, ret, i;
if (spec->type == GIC_DEVICE) {
/* verify that shared irqs don't conflict with an IPI irq */
if ((spec->hwirq >= GIC_SHARED_HWIRQ_BASE) &&
test_bit(GIC_HWIRQ_TO_SHARED(spec->hwirq), ipi_resrv))
return -EBUSY;
return gic_setup_dev_chip(d, virq, spec->hwirq);
} else {
base_hwirq = find_first_bit(ipi_resrv, gic_shared_intrs);
if (base_hwirq == gic_shared_intrs) {
return -ENOMEM;
}
/* check that we have enough space */
for (i = base_hwirq; i < nr_irqs; i++) {
if (!test_bit(i, ipi_resrv))
return -EBUSY;
}
bitmap_clear(ipi_resrv, base_hwirq, nr_irqs);
/* map the hwirq for each cpu consecutively */
i = 0;
for_each_cpu(cpu, spec->ipimask) {
hwirq = GIC_SHARED_TO_HWIRQ(base_hwirq + i);
ret = irq_domain_set_hwirq_and_chip(d, virq + i, hwirq,
&gic_level_irq_controller,
NULL);
if (ret)
goto error;
irq_set_handler(virq + i, handle_level_irq);
ret = gic_shared_irq_domain_map(d, virq + i, hwirq, cpu);
if (ret)
goto error;
i++;
}
/*
* tell the parent about the base hwirq we allocated so it can
* set its own domain data
*/
spec->hwirq = base_hwirq;
}
return 0;
error:
bitmap_set(ipi_resrv, base_hwirq, nr_irqs);
return ret;
}
void gic_irq_domain_free(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs)
{
irq_hw_number_t base_hwirq;
struct irq_data *data;
data = irq_get_irq_data(virq);
if (!data)
return;
base_hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(data));
bitmap_set(ipi_resrv, base_hwirq, nr_irqs);
}
int gic_irq_domain_match(struct irq_domain *d, struct device_node *node,
enum irq_domain_bus_token bus_token)
{
/* this domain should'nt be accessed directly */
return 0;
}
static const struct irq_domain_ops gic_irq_domain_ops = {
.alloc = gic_irq_domain_alloc,
.free = gic_irq_domain_free,
.match = gic_irq_domain_match,
};
static int gic_dev_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq,
unsigned int *out_type)
{
if (intsize != 3)
return -EINVAL;
if (intspec[0] == GIC_SHARED)
*out_hwirq = GIC_SHARED_TO_HWIRQ(intspec[1]);
else if (intspec[0] == GIC_LOCAL)
*out_hwirq = GIC_LOCAL_TO_HWIRQ(intspec[1]);
else
return -EINVAL;
*out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
return 0;
}
static int gic_dev_domain_alloc(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
struct irq_fwspec *fwspec = arg;
struct gic_irq_spec spec = {
.type = GIC_DEVICE,
};
int i, ret;
if (fwspec->param[0] == GIC_SHARED)
spec.hwirq = GIC_SHARED_TO_HWIRQ(fwspec->param[1]);
else
spec.hwirq = GIC_LOCAL_TO_HWIRQ(fwspec->param[1]);
ret = irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &spec);
if (ret)
return ret;
for (i = 0; i < nr_irqs; i++) {
ret = gic_setup_dev_chip(d, virq + i, spec.hwirq + i);
if (ret)
goto error;
}
return 0;
error:
irq_domain_free_irqs_parent(d, virq, nr_irqs);
return ret;
}
void gic_dev_domain_free(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs)
{
/* no real allocation is done for dev irqs, so no need to free anything */
return;
}
static void gic_dev_domain_activate(struct irq_domain *domain,
struct irq_data *d)
{
if (GIC_HWIRQ_TO_LOCAL(d->hwirq) < GIC_NUM_LOCAL_INTRS)
gic_local_irq_domain_map(domain, d->irq, d->hwirq);
else
gic_shared_irq_domain_map(domain, d->irq, d->hwirq, 0);
}
static struct irq_domain_ops gic_dev_domain_ops = {
.xlate = gic_dev_domain_xlate,
.alloc = gic_dev_domain_alloc,
.free = gic_dev_domain_free,
.activate = gic_dev_domain_activate,
};
static int gic_ipi_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq,
unsigned int *out_type)
{
/*
* There's nothing to translate here. hwirq is dynamically allocated and
* the irq type is always edge triggered.
* */
*out_hwirq = 0;
*out_type = IRQ_TYPE_EDGE_RISING;
return 0;
}
static int gic_ipi_domain_alloc(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
struct cpumask *ipimask = arg;
struct gic_irq_spec spec = {
.type = GIC_IPI,
.ipimask = ipimask
};
int ret, i;
ret = irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &spec);
if (ret)
return ret;
/* the parent should have set spec.hwirq to the base_hwirq it allocated */
for (i = 0; i < nr_irqs; i++) {
ret = irq_domain_set_hwirq_and_chip(d, virq + i,
GIC_SHARED_TO_HWIRQ(spec.hwirq + i),
&gic_edge_irq_controller,
NULL);
if (ret)
goto error;
ret = irq_set_irq_type(virq + i, IRQ_TYPE_EDGE_RISING);
if (ret)
goto error;
}
return 0;
error:
irq_domain_free_irqs_parent(d, virq, nr_irqs);
return ret;
}
void gic_ipi_domain_free(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs)
{
irq_domain_free_irqs_parent(d, virq, nr_irqs);
}
int gic_ipi_domain_match(struct irq_domain *d, struct device_node *node,
enum irq_domain_bus_token bus_token)
{
bool is_ipi;
switch (bus_token) {
case DOMAIN_BUS_IPI:
is_ipi = d->bus_token == bus_token;
return (!node || to_of_node(d->fwnode) == node) && is_ipi;
break;
default:
return 0;
}
}
static struct irq_domain_ops gic_ipi_domain_ops = {
.xlate = gic_ipi_domain_xlate,
.alloc = gic_ipi_domain_alloc,
.free = gic_ipi_domain_free,
.match = gic_ipi_domain_match,
};
static void __init gic_map_single_int(struct device_node *node,
unsigned int irq)
{
unsigned int linux_irq;
struct irq_fwspec local_int_fwspec = {
.fwnode = &node->fwnode,
.param_count = 3,
.param = {
[0] = GIC_LOCAL,
[1] = irq,
[2] = IRQ_TYPE_NONE,
},
};
if (!gic_local_irq_is_routable(irq))
return;
linux_irq = irq_create_fwspec_mapping(&local_int_fwspec);
WARN_ON(!linux_irq);
}
static void __init gic_map_interrupts(struct device_node *node)
{
gic_map_single_int(node, GIC_LOCAL_INT_TIMER);
gic_map_single_int(node, GIC_LOCAL_INT_PERFCTR);
gic_map_single_int(node, GIC_LOCAL_INT_FDC);
}
static void __init __gic_init(unsigned long gic_base_addr,
unsigned long gic_addrspace_size,
unsigned int cpu_vec, unsigned int irqbase,
struct device_node *node)
{
unsigned int gicconfig, cpu;
unsigned int v[2];
__gic_base_addr = gic_base_addr;
gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size);
gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
GIC_SH_CONFIG_NUMINTRS_SHF;
gic_shared_intrs = ((gic_shared_intrs + 1) * 8);
gic_vpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
GIC_SH_CONFIG_NUMVPES_SHF;
gic_vpes = gic_vpes + 1;
if (cpu_has_veic) {
/* Set EIC mode for all VPEs */
for_each_present_cpu(cpu) {
gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR),
mips_cm_vp_id(cpu));
gic_write(GIC_REG(VPE_OTHER, GIC_VPE_CTL),
GIC_VPE_CTL_EIC_MODE_MSK);
}
/* Always use vector 1 in EIC mode */
gic_cpu_pin = 0;
timer_cpu_pin = gic_cpu_pin;
set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET,
__gic_irq_dispatch);
} else {
gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET;
irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec,
gic_irq_dispatch);
/*
* With the CMP implementation of SMP (deprecated), other CPUs
* are started by the bootloader and put into a timer based
* waiting poll loop. We must not re-route those CPU's local
* timer interrupts as the wait instruction will never finish,
* so just handle whatever CPU interrupt it is routed to by
* default.
*
* This workaround should be removed when CMP support is
* dropped.
*/
if (IS_ENABLED(CONFIG_MIPS_CMP) &&
gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) {
timer_cpu_pin = gic_read32(GIC_REG(VPE_LOCAL,
GIC_VPE_TIMER_MAP)) &
GIC_MAP_MSK;
irq_set_chained_handler(MIPS_CPU_IRQ_BASE +
GIC_CPU_PIN_OFFSET +
timer_cpu_pin,
gic_irq_dispatch);
} else {
timer_cpu_pin = gic_cpu_pin;
}
}
gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS +
gic_shared_intrs, irqbase,
&gic_irq_domain_ops, NULL);
if (!gic_irq_domain)
panic("Failed to add GIC IRQ domain");
gic_irq_domain->name = "mips-gic-irq";
gic_dev_domain = irq_domain_add_hierarchy(gic_irq_domain, 0,
GIC_NUM_LOCAL_INTRS + gic_shared_intrs,
node, &gic_dev_domain_ops, NULL);
if (!gic_dev_domain)
panic("Failed to add GIC DEV domain");
gic_dev_domain->name = "mips-gic-dev";
gic_ipi_domain = irq_domain_add_hierarchy(gic_irq_domain,
IRQ_DOMAIN_FLAG_IPI_PER_CPU,
GIC_NUM_LOCAL_INTRS + gic_shared_intrs,
node, &gic_ipi_domain_ops, NULL);
if (!gic_ipi_domain)
panic("Failed to add GIC IPI domain");
gic_ipi_domain->name = "mips-gic-ipi";
gic_ipi_domain->bus_token = DOMAIN_BUS_IPI;
if (node &&
!of_property_read_u32_array(node, "mti,reserved-ipi-vectors", v, 2)) {
bitmap_set(ipi_resrv, v[0], v[1]);
} else {
/* Make the last 2 * gic_vpes available for IPIs */
bitmap_set(ipi_resrv,
gic_shared_intrs - 2 * gic_vpes,
2 * gic_vpes);
}
gic_basic_init();
gic_map_interrupts(node);
}
void __init gic_init(unsigned long gic_base_addr,
unsigned long gic_addrspace_size,
unsigned int cpu_vec, unsigned int irqbase)
{
__gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, NULL);
}
static int __init gic_of_init(struct device_node *node,
struct device_node *parent)
{
struct resource res;
unsigned int cpu_vec, i = 0, reserved = 0;
phys_addr_t gic_base;
size_t gic_len;
/* Find the first available CPU vector. */
while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors",
i++, &cpu_vec))
reserved |= BIT(cpu_vec);
for (cpu_vec = 2; cpu_vec < 8; cpu_vec++) {
if (!(reserved & BIT(cpu_vec)))
break;
}
if (cpu_vec == 8) {
pr_err("No CPU vectors available for GIC\n");
return -ENODEV;
}
if (of_address_to_resource(node, 0, &res)) {
/*
* Probe the CM for the GIC base address if not specified
* in the device-tree.
*/
if (mips_cm_present()) {
gic_base = read_gcr_gic_base() &
~CM_GCR_GIC_BASE_GICEN_MSK;
gic_len = 0x20000;
} else {
pr_err("Failed to get GIC memory range\n");
return -ENODEV;
}
} else {
gic_base = res.start;
gic_len = resource_size(&res);
}
if (mips_cm_present())
write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN_MSK);
gic_present = true;
__gic_init(gic_base, gic_len, cpu_vec, 0, node);
return 0;
}
IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init);