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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/cpu.h>
#include <arch/io.h>
#include <console/console.h>
#include <gic.h>
#include "gic.h"
enum {
ENABLE_GRP0 = 0x1 << 0,
ENABLE_GRP1 = 0x1 << 1,
FIQ_BYP_DIS_GRP0 = 0x1 << 5,
IRQ_BYP_DIS_GRP0 = 0x1 << 6,
FIQ_BYP_DIS_GRP1 = 0x1 << 7,
IRQ_BYP_DIS_GRP1 = 0x1 << 8,
};
struct gic {
struct gicd_mmio *gicd;
struct gicc_mmio *gicc;
size_t num_interrupts;
unsigned int version;
unsigned int security_extensions;
};
static struct gic *gic_get(void)
{
static struct gic gic;
if (gic.gicd == NULL) {
uint32_t typer;
gic.gicd = gicd_base();
gic.gicc = gicc_base();
typer = read32(&gic.gicd->typer);
gic.num_interrupts = 32 * ((typer & 0x1f) + 1);
gic.security_extensions = !!(typer & (1 << 10));
gic.version = (read32(&gic.gicd->icpidr2) & 0xf0) >> 4;
printk(BIOS_DEBUG, "GICv%d - %zu ints %s GICD=%p GICC=%p\n",
gic.version, gic.num_interrupts,
gic.security_extensions ? "SecExtn" : "",
gic.gicd, gic.gicc);
}
return &gic;
}
static inline uint32_t gic_read(uint32_t *base)
{
return read32(base);
}
static inline void gic_write(uint32_t *base, uint32_t val)
{
write32(base, val);
}
static void gic_write_regs(uint32_t *base, size_t num_regs, uint32_t val)
{
size_t i;
for (i = 0; i < num_regs; i++)
gic_write(base++, val);
}
static void gic_write_banked_regs(uint32_t *base, size_t interrupts_per_reg,
uint32_t val)
{
/* 1st 32 interrupts are banked per CPU. */
gic_write_regs(base, 32 / interrupts_per_reg, val);
}
void gic_init(void)
{
struct gic *gic;
struct gicd_mmio *gicd;
struct gicc_mmio *gicc;
uint32_t cpu_mask;
gic = gic_get();
gicd = gic->gicd;
gicc = gic->gicc;
/* Enable Group 0 and Group 1 in GICD -- banked regs. */
gic_write(&gicd->ctlr, ENABLE_GRP0 | ENABLE_GRP1);
/* Enable Group 0 and Group 1 in GICC and enable all priroity levels. */
gic_write(&gicc->ctlr, ENABLE_GRP0 | ENABLE_GRP1);
gic_write(&gicc->pmr, 1 << 7);
cpu_mask = 1 << smp_processor_id();
cpu_mask |= cpu_mask << 8;
cpu_mask |= cpu_mask << 16;
/* Only write banked registers for secondary CPUs. */
if (smp_processor_id()) {
gic_write_banked_regs(&gicd->itargetsr[0], 4, cpu_mask);
/* Put interrupts into Group 1. */
gic_write_banked_regs(&gicd->igroupr[0], 32, ~0x0);
/* Allow Non-secure access to everything. */
gic_write_banked_regs(&gicd->nsacr[0], 16, ~0x0);
return;
}
/* All interrupts routed to processors that execute this function. */
gic_write_regs(&gicd->itargetsr[0], gic->num_interrupts / 4, cpu_mask);
/* Put all interrupts into Gropup 1. */
gic_write_regs(&gicd->igroupr[0], gic->num_interrupts / 32, ~0x0);
/* Allow Non-secure access to everything. */
gic_write_regs(&gicd->nsacr[0], gic->num_interrupts / 16, ~0x0);
}
void gic_disable(void)
{
struct gic *gic;
struct gicc_mmio *gicc;
gic = gic_get();
gicc = gic->gicc;
/* Disable secure, non-secure interrupts. */
uint32_t val = gic_read(&gicc->ctlr);
val &= ~(ENABLE_GRP0 | ENABLE_GRP1);
/*
* Enable the IRQ/FIQ BypassDisable bits to bypass the IRQs.
* So the CPU can wake up from power gating state when the GIC
* was disabled.
*/
val |= FIQ_BYP_DIS_GRP0 | IRQ_BYP_DIS_GRP0 |
FIQ_BYP_DIS_GRP1 | IRQ_BYP_DIS_GRP1;
gic_write(&gicc->ctlr, val);
}
void gic_enable(void)
{
struct gic *gic;
struct gicc_mmio *gicc;
gic = gic_get();
gicc = gic->gicc;
/* Enable secure, non-secure interrupts. */
uint32_t val = gic_read(&gicc->ctlr);
val |= (ENABLE_GRP0 | ENABLE_GRP1);
gic_write(&gicc->ctlr, val);
}
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