ref: bd1305a0b9841d65f95b4d81fa0d29067425833a
dir: /sys/src/9/imx8/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 "../arm64/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,
RD_base = 0x00000,
GICR_CTLR = (RD_base+0x000)/4,
GICR_IIDR = (RD_base+0x004)/4,
GICR_TYPER = (RD_base+0x008)/4,
GICR_STATUSR = (RD_base+0x010)/4,
GICR_WAKER = (RD_base+0x014)/4,
GICR_SETLPIR = (RD_base+0x040)/4,
GICR_CLRLPIR = (RD_base+0x048)/4,
GICR_PROPBASER = (RD_base+0x070)/4,
GICR_PENDBASER = (RD_base+0x078)/4,
GICR_INVLPIR = (RD_base+0x0A0)/4,
GICR_INVALLR = (RD_base+0x0B0)/4,
GICR_SYNCR = (RD_base+0x0C0)/4,
SGI_base = 0x10000,
GICR_IGROUPR0 = (SGI_base+0x080)/4,
GICR_ISENABLER0 = (SGI_base+0x100)/4,
GICR_ICENABLER0 = (SGI_base+0x180)/4,
GICR_ISPENDR0 = (SGI_base+0x200)/4,
GICR_ICPENDR0 = (SGI_base+0x280)/4,
GICR_ISACTIVER0 = (SGI_base+0x300)/4,
GICR_ICACTIVER0 = (SGI_base+0x380)/4,
GICR_IPRIORITYR0= (SGI_base+0x400)/4,
GICR_ICFGR0 = (SGI_base+0xC00)/4,
GICR_ICFGR1 = (SGI_base+0xC04)/4,
GICR_IGRPMODR0 = (SGI_base+0xD00)/4,
GICR_NSACR = (SGI_base+0xE00)/4,
};
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 *dregs = (u32int*)(VIRTIO + 0x8800000);
static u32int*
getrregs(int machno)
{
u32int *rregs = (u32int*)(VIRTIO + 0x8880000);
for(;;){
if((rregs[GICR_TYPER] & 0xFFFF00) == (machno << 8))
return rregs;
if(rregs[GICR_TYPER] & (1<<4))
break;
rregs += (0x20000/4);
}
panic("getrregs: no re-distributor for cpu %d\n", machno);
}
void
intrcpushutdown(void)
{
/* disable cpu interface */
syswr(ICC_IGRPEN0_EL1, 0);
syswr(ICC_IGRPEN1_EL1, 0);
coherence();
}
void
intrsoff(void)
{
/* disable distributor */
dregs[GICD_CTLR] = 0;
coherence();
while(dregs[GICD_CTLR]&(1<<31))
;
}
void
intrinit(void)
{
u32int *rregs;
int i, n;
if(m->machno == 0){
intrsoff();
/* clear all interrupts */
n = ((dregs[GICD_TYPER] & 0x1F)+1) << 5;
for(i = 32; i < n; i += 32){
dregs[GICD_IGROUPR0 + (i/32)] = -1;
dregs[GICD_ISENABLER0 + (i/32)] = -1;
while(dregs[GICD_CTLR]&(1<<31))
;
dregs[GICD_ICENABLER0 + (i/32)] = -1;
while(dregs[GICD_CTLR]&(1<<31))
;
dregs[GICD_ICACTIVER0 + (i/32)] = -1;
}
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();
while(dregs[GICD_CTLR]&(1<<31))
;
dregs[GICD_CTLR] = (1<<0) | (1<<1) | (1<<4);
}
rregs = getrregs(m->machno);
n = 32;
for(i = 0; i < n; i += 32){
rregs[GICR_IGROUPR0 + (i/32)] = -1;
rregs[GICR_ISENABLER0 + (i/32)] = -1;
while(rregs[GICR_CTLR]&(1<<3))
;
rregs[GICR_ICENABLER0 + (i/32)] = -1;
while(dregs[GICD_CTLR]&(1<<31))
;
rregs[GICR_ICACTIVER0 + (i/32)] = -1;
}
for(i = 0; i < n; i += 4){
rregs[GICR_IPRIORITYR0 + (i/4)] = 0;
}
coherence();
while(rregs[GICR_CTLR]&(1<<3))
;
coherence();
/* enable cpu interface */
syswr(ICC_CTLR_EL1, 0);
syswr(ICC_BPR1_EL1, 7);
syswr(ICC_PMR_EL1, 0xFF);
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 = sysrd(ICC_IAR1_EL1) & 0xFFFFFF;
// iprint("i<%d>", intid);
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 == IRQcntpns)
clockintr = 1;
}
coherence();
syswr(ICC_EOIR1_EL1, intid);
return clockintr;
}
/*
* called direct from lexception.s to handle fiq interrupt.
*/
void
fiq(Ureg *ureg)
{
Vctl *v;
u32int intid;
m->intr++;
intid = sysrd(ICC_IAR1_EL1) & 0xFFFFFF;
// iprint("f<%d>", intid);
if((intid & ~3) == 1020)
return; // spurious
v = vfiq;
if(v != nil && v->intid == intid && m->machno == 0){
coherence();
v->f(ureg, v->a);
coherence();
}
syswr(ICC_EOIR1_EL1, 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;
prio = 0x80;
intid = irq;
if((v = xalloc(sizeof(Vctl))) == nil)
panic("intrenable: no mem");
v->irq = irq;
v->intid = intid;
v->f = f;
v->a = a;
lock(&vctllock);
if(intid < SPI)
cpu = m->machno;
else
cpu = 0;
if(irq == IRQfiq){
vfiq = v;
prio = 0;
}else{
v->next = vctl[cpu][intid%32];
vctl[cpu][intid%32] = v;
}
syswr(ICC_IGRPEN1_EL1, sysrd(ICC_IGRPEN1_EL1)|1);
coherence();
syswr(ICC_EOIR1_EL1, intid);
coherence();
/* setup */
if(intid < 32){
u32int *rregs = getrregs(cpu);
rregs[GICR_IPRIORITYR0 + (intid/4)] |= prio << ((intid%4) << 3);
coherence();
rregs[GICR_ISENABLER0] = 1 << (intid%32);
coherence();
while(rregs[GICR_CTLR]&(1<<3))
;
} else {
dregs[GICD_IPRIORITYR0 + (intid/4)] |= prio << ((intid%4) << 3);
dregs[GICD_TARGETSR0 + (intid/4)] |= (1<<cpu) << ((intid%4) << 3);
coherence();
dregs[GICD_ISENABLER0 + (intid/32)] = 1 << (intid%32);
coherence();
while(dregs[GICD_CTLR]&(1<<31))
;
}
unlock(&vctllock);
}
void
intrdisable(int, void (*f)(Ureg*, void*), void *a, int tbdf, char*)
{
if(BUSTYPE(tbdf) == BusPCI){
pciintrdisable(tbdf, f, a);
return;
}
}