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linux-sg2042/arch/mips/kernel/irq-gic.c

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/*
* 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/init.h>
#include <linux/smp.h>
#include <linux/irq.h>
#include <linux/clocksource.h>
#include <asm/io.h>
#include <asm/gic.h>
#include <asm/setup.h>
#include <asm/traps.h>
#include <linux/hardirq.h>
#include <asm-generic/bitops/find.h>
unsigned int gic_frequency;
unsigned int gic_present;
unsigned long _gic_base;
unsigned int gic_irq_base;
unsigned int gic_irq_flags[GIC_NUM_INTRS];
/* The index into this array is the vector # of the interrupt. */
struct gic_shared_intr_map gic_shared_intr_map[GIC_NUM_INTRS];
static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
static struct gic_pending_regs pending_regs[NR_CPUS];
static struct gic_intrmask_regs intrmask_regs[NR_CPUS];
#if defined(CONFIG_CSRC_GIC) || defined(CONFIG_CEVT_GIC)
cycle_t gic_read_count(void)
{
unsigned int hi, hi2, lo;
do {
GICREAD(GIC_REG(SHARED, GIC_SH_COUNTER_63_32), hi);
GICREAD(GIC_REG(SHARED, GIC_SH_COUNTER_31_00), lo);
GICREAD(GIC_REG(SHARED, GIC_SH_COUNTER_63_32), hi2);
} while (hi2 != hi);
return (((cycle_t) hi) << 32) + lo;
}
void gic_write_compare(cycle_t cnt)
{
GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI),
(int)(cnt >> 32));
GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO),
(int)(cnt & 0xffffffff));
}
void gic_write_cpu_compare(cycle_t cnt, int cpu)
{
unsigned long flags;
local_irq_save(flags);
GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), cpu);
GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI),
(int)(cnt >> 32));
GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO),
(int)(cnt & 0xffffffff));
local_irq_restore(flags);
}
cycle_t gic_read_compare(void)
{
unsigned int hi, lo;
GICREAD(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI), hi);
GICREAD(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO), lo);
return (((cycle_t) hi) << 32) + lo;
}
#endif
unsigned int gic_get_timer_pending(void)
{
unsigned int vpe_pending;
GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), 0);
GICREAD(GIC_REG(VPE_OTHER, GIC_VPE_PEND), vpe_pending);
return (vpe_pending & GIC_VPE_PEND_TIMER_MSK);
}
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 */
GICWRITE(GIC_REG_ADDR(VPE_LOCAL, GIC_VPE_EIC_SS(irq)), set);
}
void gic_send_ipi(unsigned int intr)
{
GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), 0x80000000 | intr);
}
static void gic_eic_irq_dispatch(void)
{
unsigned int cause = read_c0_cause();
int irq;
irq = (cause & ST0_IM) >> STATUSB_IP2;
if (irq == 0)
irq = -1;
if (irq >= 0)
do_IRQ(gic_irq_base + irq);
else
spurious_interrupt();
}
static void __init vpe_local_setup(unsigned int numvpes)
{
unsigned long timer_intr = GIC_INT_TMR;
unsigned long perf_intr = GIC_INT_PERFCTR;
unsigned int vpe_ctl;
int i;
if (cpu_has_veic) {
/*
* GIC timer interrupt -> CPU HW Int X (vector X+2) ->
* map to pin X+2-1 (since GIC adds 1)
*/
timer_intr += (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
/*
* GIC perfcnt interrupt -> CPU HW Int X (vector X+2) ->
* map to pin X+2-1 (since GIC adds 1)
*/
perf_intr += (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
}
/*
* Setup the default performance counter timer interrupts
* for all VPEs
*/
for (i = 0; i < numvpes; i++) {
GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
/* Are Interrupts locally routable? */
GICREAD(GIC_REG(VPE_OTHER, GIC_VPE_CTL), vpe_ctl);
if (vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK)
GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP),
GIC_MAP_TO_PIN_MSK | timer_intr);
if (cpu_has_veic) {
set_vi_handler(timer_intr + GIC_PIN_TO_VEC_OFFSET,
gic_eic_irq_dispatch);
gic_shared_intr_map[timer_intr + GIC_PIN_TO_VEC_OFFSET].local_intr_mask |= GIC_VPE_RMASK_TIMER_MSK;
}
if (vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK)
GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP),
GIC_MAP_TO_PIN_MSK | perf_intr);
if (cpu_has_veic) {
set_vi_handler(perf_intr + GIC_PIN_TO_VEC_OFFSET, gic_eic_irq_dispatch);
gic_shared_intr_map[perf_intr + GIC_PIN_TO_VEC_OFFSET].local_intr_mask |= GIC_VPE_RMASK_PERFCNT_MSK;
}
}
}
unsigned int gic_compare_int(void)
{
unsigned int pending;
GICREAD(GIC_REG(VPE_LOCAL, GIC_VPE_PEND), pending);
if (pending & GIC_VPE_PEND_CMP_MSK)
return 1;
else
return 0;
}
unsigned int gic_get_int(void)
{
unsigned int i;
unsigned long *pending, *intrmask, *pcpu_mask;
unsigned long *pending_abs, *intrmask_abs;
/* Get per-cpu bitmaps */
pending = pending_regs[smp_processor_id()].pending;
intrmask = intrmask_regs[smp_processor_id()].intrmask;
pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask;
pending_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
GIC_SH_PEND_31_0_OFS);
intrmask_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
GIC_SH_MASK_31_0_OFS);
for (i = 0; i < BITS_TO_LONGS(GIC_NUM_INTRS); i++) {
GICREAD(*pending_abs, pending[i]);
GICREAD(*intrmask_abs, intrmask[i]);
pending_abs++;
intrmask_abs++;
}
bitmap_and(pending, pending, intrmask, GIC_NUM_INTRS);
bitmap_and(pending, pending, pcpu_mask, GIC_NUM_INTRS);
return find_first_bit(pending, GIC_NUM_INTRS);
}
static void gic_mask_irq(struct irq_data *d)
{
GIC_CLR_INTR_MASK(d->irq - gic_irq_base);
}
static void gic_unmask_irq(struct irq_data *d)
{
GIC_SET_INTR_MASK(d->irq - gic_irq_base);
}
#ifdef CONFIG_SMP
static DEFINE_SPINLOCK(gic_lock);
static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
bool force)
{
unsigned int irq = (d->irq - gic_irq_base);
cpumask_t tmp = CPU_MASK_NONE;
unsigned long flags;
int i;
cpumask_and(&tmp, cpumask, cpu_online_mask);
if (cpus_empty(tmp))
return -1;
/* Assumption : cpumask refers to a single CPU */
spin_lock_irqsave(&gic_lock, flags);
/* Re-route this IRQ */
GIC_SH_MAP_TO_VPE_SMASK(irq, first_cpu(tmp));
/* Update the pcpu_masks */
for (i = 0; i < NR_CPUS; i++)
clear_bit(irq, pcpu_masks[i].pcpu_mask);
set_bit(irq, pcpu_masks[first_cpu(tmp)].pcpu_mask);
cpumask_copy(d->affinity, cpumask);
spin_unlock_irqrestore(&gic_lock, flags);
return IRQ_SET_MASK_OK_NOCOPY;
}
#endif
static struct irq_chip gic_irq_controller = {
.name = "MIPS GIC",
.irq_ack = gic_irq_ack,
.irq_mask = gic_mask_irq,
.irq_mask_ack = gic_mask_irq,
.irq_unmask = gic_unmask_irq,
.irq_eoi = gic_finish_irq,
#ifdef CONFIG_SMP
.irq_set_affinity = gic_set_affinity,
#endif
};
static void __init gic_setup_intr(unsigned int intr, unsigned int cpu,
unsigned int pin, unsigned int polarity, unsigned int trigtype,
unsigned int flags)
{
struct gic_shared_intr_map *map_ptr;
/* Setup Intr to Pin mapping */
if (pin & GIC_MAP_TO_NMI_MSK) {
GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)), pin);
/* FIXME: hack to route NMI to all cpu's */
for (cpu = 0; cpu < NR_CPUS; cpu += 32) {
GICWRITE(GIC_REG_ADDR(SHARED,
GIC_SH_MAP_TO_VPE_REG_OFF(intr, cpu)),
0xffffffff);
}
} else {
GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)),
GIC_MAP_TO_PIN_MSK | pin);
/* Setup Intr to CPU mapping */
GIC_SH_MAP_TO_VPE_SMASK(intr, cpu);
if (cpu_has_veic) {
set_vi_handler(pin + GIC_PIN_TO_VEC_OFFSET,
gic_eic_irq_dispatch);
map_ptr = &gic_shared_intr_map[pin + GIC_PIN_TO_VEC_OFFSET];
if (map_ptr->num_shared_intr >= GIC_MAX_SHARED_INTR)
BUG();
map_ptr->intr_list[map_ptr->num_shared_intr++] = intr;
}
}
/* Setup Intr Polarity */
GIC_SET_POLARITY(intr, polarity);
/* Setup Intr Trigger Type */
GIC_SET_TRIGGER(intr, trigtype);
/* Init Intr Masks */
GIC_CLR_INTR_MASK(intr);
/* Initialise per-cpu Interrupt software masks */
if (flags & GIC_FLAG_IPI)
set_bit(intr, pcpu_masks[cpu].pcpu_mask);
if ((flags & GIC_FLAG_TRANSPARENT) && (cpu_has_veic == 0))
GIC_SET_INTR_MASK(intr);
if (trigtype == GIC_TRIG_EDGE)
gic_irq_flags[intr] |= GIC_TRIG_EDGE;
}
static void __init gic_basic_init(int numintrs, int numvpes,
struct gic_intr_map *intrmap, int mapsize)
{
unsigned int i, cpu;
unsigned int pin_offset = 0;
board_bind_eic_interrupt = &gic_bind_eic_interrupt;
/* Setup defaults */
for (i = 0; i < numintrs; i++) {
GIC_SET_POLARITY(i, GIC_POL_POS);
GIC_SET_TRIGGER(i, GIC_TRIG_LEVEL);
GIC_CLR_INTR_MASK(i);
if (i < GIC_NUM_INTRS) {
gic_irq_flags[i] = 0;
gic_shared_intr_map[i].num_shared_intr = 0;
gic_shared_intr_map[i].local_intr_mask = 0;
}
}
/*
* In EIC mode, the HW_INT# is offset by (2-1). Need to subtract
* one because the GIC will add one (since 0=no intr).
*/
if (cpu_has_veic)
pin_offset = (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
/* Setup specifics */
for (i = 0; i < mapsize; i++) {
cpu = intrmap[i].cpunum;
if (cpu == GIC_UNUSED)
continue;
if (cpu == 0 && i != 0 && intrmap[i].flags == 0)
continue;
gic_setup_intr(i,
intrmap[i].cpunum,
intrmap[i].pin + pin_offset,
intrmap[i].polarity,
intrmap[i].trigtype,
intrmap[i].flags);
}
vpe_local_setup(numvpes);
}
void __init gic_init(unsigned long gic_base_addr,
unsigned long gic_addrspace_size,
struct gic_intr_map *intr_map, unsigned int intr_map_size,
unsigned int irqbase)
{
unsigned int gicconfig;
int numvpes, numintrs;
_gic_base = (unsigned long) ioremap_nocache(gic_base_addr,
gic_addrspace_size);
gic_irq_base = irqbase;
GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
numintrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
GIC_SH_CONFIG_NUMINTRS_SHF;
numintrs = ((numintrs + 1) * 8);
numvpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
GIC_SH_CONFIG_NUMVPES_SHF;
numvpes = numvpes + 1;
gic_basic_init(numintrs, numvpes, intr_map, intr_map_size);
gic_platform_init(numintrs, &gic_irq_controller);
}
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