ref: faa625a1d5ab47ac0438b2cea5b2bde1ea747b8b
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 "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); return nil; } 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 tbdf, void (*f)(Ureg*, void*), void *a, int, char*) { if(BUSTYPE(tbdf) == BusPCI){ pciintrdisable(tbdf, f, a); return; } }