ref: dfb4b522830edab8f3856289d326d6cf5e930644
dir: /sys/src/9/bcm64/gic.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/pci.h"
#include "ureg.h"
#include "sysreg.h"
#include "../port/error.h"
enum {
GICD_CTLR = 0x000/4, /* RW, Distributor Control Register */
GICD_TYPER = 0x004/4, /* RO, Interrupt Controller Type */
GICD_IIDR = 0x008/4, /* RO, Distributor Implementer Identification Register */
GICD_IGROUPR0 = 0x080/4, /* RW, Interrupt Group Registers (0x80-0xBC) */
GICD_ISENABLER0 = 0x100/4, /* RW, Interrupt Set-Enable Registers (0x100-0x13C) */
GICD_ICENABLER0 = 0x180/4, /* RW, Interrupt Clear-Enable Registers (0x180-0x1BC) */
GICD_ISPENDR0 = 0x200/4, /* RW, Interrupt Set-Pending Registers (0x200-0x23C) */
GICD_ICPENDR0 = 0x280/4, /* RW, Interrupt Clear-Pending Registers (0x280-0x2BC) */
GICD_ISACTIVER0 = 0x300/4, /* RW, Interrupt Set-Active Registers (0x300-0x33C) */
GICD_ICACTIVER0 = 0x380/4, /* RW, Interrupt Clear-Active Registers (0x380-0x3BC) */
GICD_IPRIORITYR0= 0x400/4, /* RW, Interrupt Priority Registers (0x400-0x5FC) */
GICD_TARGETSR0 = 0x800/4, /* RW, Interrupt Target Registers (0x800-0x9FC) */
GICD_ICFGR0 = 0xC00/4, /* RW, Interrupt Configuration Registers (0xC00-0xC7C) */
GICD_ISR0 = 0xD00/4,
GICD_PPISR = GICD_ISR0, /* RO, Private Peripheral Interrupt Status Register */
GICD_SPISR0 = GICD_ISR0+1, /* RO, Shared Peripheral Interrupt Status Register */
GICD_SGIR = 0xF00/4, /* WO, Software Generated Interrupt Register */
GICD_CPENDSGIR0 = 0xF10/4, /* RW, SGI Clear-Pending Registers (0xF10-0xF1C) */
GICD_SPENDSGIR0 = 0xF20/4, /* RW, SGI Set-Pending Registers (0xF20-0xF2C) */
GICD_PIDR4 = 0xFD0/4, /* RO, Perpheral ID Registers */
GICD_PIDR5 = 0xFD4/4,
GICD_PIDR6 = 0xFD8/4,
GICD_PIDR7 = 0xFDC/4,
GICD_PIDR0 = 0xFE0/4,
GICD_PIDR1 = 0xFE4/4,
GICD_PIDR2 = 0xFE8/4,
GICD_PIDR3 = 0xFEC/4,
GICD_CIDR0 = 0xFF0/4, /* RO, Component ID Registers */
GICD_CIDR1 = 0xFF4/4,
GICD_CIDR2 = 0xFF8/4,
GICD_CIDR3 = 0xFFC/4,
GICC_CTLR = 0x000/4, /* RW, CPU Interace Control Register */
GICC_PMR = 0x004/4, /* RW, Interrupt Priority Mask Register */
GICC_BPR = 0x008/4, /* RW, Binary Point Register */
GICC_IAR = 0x00C/4, /* RO, Interrupt Acknowledge Register */
GICC_EOIR = 0x010/4, /* WO, End of Interrupt Register */
GICC_RPR = 0x014/4, /* RO, Running Priority Register */
GICC_HPPIR = 0x018/4, /* RO, Highest Priority Pending Interrupt Register */
GICC_ABPR = 0x01C/4, /* RW, Aliased Binary Point Register */
GICC_AIAR = 0x020/4, /* RO, Aliased Interrupt Acknowledge Register */
GICC_AEOIR = 0x024/4, /* WO, Aliased End of Interrupt Register */
GICC_AHPPIR = 0x028/4, /* RO, Aliased Highest Priority Pending Interrupt Register */
GICC_APR0 = 0x0D0/4, /* RW, Active Priority Register */
GICC_NSAPR0 = 0x0E0/4, /* RW, Non-Secure Active Priority Register */
GICC_IIDR = 0x0FC/4, /* RO, CPU Interface Identification Register */
GICC_DIR = 0x1000/4, /* WO, Deactivate Interrupt Register */
GICH_HCR = 0x000/4, /* RW, Hypervisor Control Register */
GICH_VTR = 0x004/4, /* RO, VGIC Type Register */
GICH_VMCR = 0x008/4, /* RW, Virtual Machine Control Register */
GICH_MISR = 0x010/4, /* RO, Maintenance Interrupt Status Register */
GICH_EISR0 = 0x020/4, /* RO, End of Interrupt Status Register */
GICH_ELSR0 = 0x030/4, /* RO, Empty List Register Status Register */
GICH_APR0 = 0x0F0/4, /* RW, Active Priority Register */
GICH_LR0 = 0x100/4, /* RW, List Registers (0x100-0x10C) */
GICV_CTLR = 0x000/4, /* RW, Virtual Machine Control Register */
GICV_PMR = 0x004/4, /* RW, VM Priority Mask Register */
GICV_BPR = 0x008/4, /* RW, VM Binary Point Register */
GICV_IAR = 0x00C/4, /* RO, VM Interrupt Acknowledge Register */
GICV_EOIR = 0x010/4, /* WO, VM End of Interrupt Register */
GICV_RPR = 0x014/4, /* RO, VM Running Priority Register */
GICV_HPPIR = 0x018/4, /* RO, VM Highest Piority Pending Interrupt Register */
GICV_ABPR = 0x01C/4, /* RW, VM Aliased Binary Point Register */
GICV_AIAR = 0x020/4, /* RO, VM Aliased Interrupt Acknowledge Register */
GICV_AEOIR = 0x024/4, /* WO, VM Aliased End of Interrupt Register */
GICV_AHPPIR = 0x028/4, /* RO, VM Aliaed Highest Piority Pending Interrupt Register */
GICV_APR0 = 0x0D0/4, /* RW, VM Active Priority Register */
GICV_IIDR = 0x0FC/4, /* RO, VM CPU Interface Identification Register */
GICV_DIR = 0x1000/4, /* WO, VM Deactivate Interrupt Register */
};
typedef struct Vctl Vctl;
struct Vctl {
Vctl *next;
void (*f)(Ureg*, void*);
void *a;
int irq;
u32int intid;
};
static Lock vctllock;
static Vctl *vctl[MAXMACH][32], *vfiq;
static u32int *cregs, *dregs;
void
intrcpushutdown(void)
{
if(cregs == nil || dregs == nil){
uintptr va, pa;
pa = sysrd(CBAR_EL1);
va = ARMLOCAL + (pa - soc.armlocal);
dregs = (u32int*)(va + 0x1000);
cregs = (u32int*)(va + 0x2000);
}
/* disable cpu interface */
cregs[GICC_CTLR] &= ~1;
coherence();
}
void
intrsoff(void)
{
int i, n;
intrcpushutdown();
/* disable distributor */
dregs[GICD_CTLR] &= ~1;
coherence();
/* clear all interrupts */
n = ((dregs[GICD_TYPER] & 0x1F)+1) << 5;
for(i = 0; i < n; i += 32){
dregs[GICD_ISENABLER0 + (i/32)] = -1;
coherence();
dregs[GICD_ICENABLER0 + (i/32)] = -1;
coherence();
}
for(i = 0; i < n; i += 4){
dregs[GICD_IPRIORITYR0 + (i/4)] = 0;
dregs[GICD_TARGETSR0 + (i/4)] = 0;
}
for(i = 32; i < n; i += 16)
dregs[GICD_ICFGR0 + (i/16)] = 0;
coherence();
}
/*
* called by trap to handle irq interrupts.
* returns true iff a clock interrupt, thus maybe reschedule.
*/
int
irq(Ureg* ureg)
{
Vctl *v;
int clockintr;
u32int intid;
m->intr++;
intid = cregs[GICC_IAR] & 0xFFFFFF;
if((intid & ~3) == 1020)
return 0; // spurious
clockintr = 0;
for(v = vctl[m->machno][intid%32]; v != nil; v = v->next)
if(v->intid == intid){
coherence();
v->f(ureg, v->a);
coherence();
if(v->irq == IRQclock || v->irq == IRQcntps || v->irq == IRQcntpns)
clockintr = 1;
}
coherence();
cregs[GICC_EOIR] = intid;
return clockintr;
}
/*
* called direct from lexception.s to handle fiq interrupt.
*/
void
fiq(Ureg *ureg)
{
Vctl *v;
u32int intid;
m->intr++;
intid = cregs[GICC_IAR] & 0xFFFFFF;
if((intid & ~3) == 1020)
return; // spurious
v = vfiq;
if(v != nil && v->intid == intid && m->machno == 0){
coherence();
v->f(ureg, v->a);
coherence();
}
cregs[GICC_EOIR] = intid;
}
void
intrenable(int irq, void (*f)(Ureg*, void*), void *a, int tbdf, char*)
{
Vctl *v;
u32int intid;
int cpu, prio;
if(BUSTYPE(tbdf) == BusPCI){
pciintrenable(tbdf, f, a);
return;
}
if(tbdf != BUSUNKNOWN)
return;
cpu = 0;
prio = 0x80;
intid = irq;
switch(irq){
case IRQcntps:
intid = 16 + 13;
break;
case IRQcntpns:
intid = 16 + 14;
break;
case IRQmbox0:
case IRQmbox1:
case IRQmbox2:
case IRQmbox3:
case IRQlocaltmr:
print("irqenable: missing documentation for local irq %d\n", irq);
return;
default:
if(irq < IRQgic){
if(irq < 64)
intid += IRQgic-64;
else if(irq >= IRQbasic)
intid += IRQgic-64-32-8-IRQbasic;
}
}
if(intid < 32)
cpu = m->machno;
if((v = xalloc(sizeof(Vctl))) == nil)
panic("irqenable: no mem");
v->irq = irq;
v->intid = intid;
v->f = f;
v->a = a;
lock(&vctllock);
if(irq == IRQfiq){
vfiq = v;
prio = 0;
}else{
v->next = vctl[cpu][intid%32];
vctl[cpu][intid%32] = v;
}
/* enable cpu interface */
cregs[GICC_PMR] = 0xFF;
coherence();
cregs[GICC_CTLR] |= 1;
coherence();
cregs[GICC_EOIR] = intid;
/* enable distributor */
dregs[GICD_CTLR] |= 1;
coherence();
/* setup */
dregs[GICD_IPRIORITYR0 + (intid/4)] |= prio << ((intid%4) << 3);
dregs[GICD_TARGETSR0 + (intid/4)] |= (1<<cpu) << ((intid%4) << 3);
coherence();
/* turn on */
dregs[GICD_ISENABLER0 + (intid/32)] = 1 << (intid%32);
coherence();
unlock(&vctllock);
}
void
intrdisable(int, void (*f)(Ureg*, void*), void *a, int tbdf, char*)
{
if(BUSTYPE(tbdf) == BusPCI){
pciintrdisable(tbdf, f, a);
return;
}
}