blob: 862d389f816e6cf955467345becbe7bc154941f1 [file] [log] [blame]
/*
* Copyright (c) 2018 Marvell
* Copyright (c) 2018 Lexmark International, Inc.
* Copyright (c) 2019 Stephanos Ioannidis <root@stephanos.io>
*
* SPDX-License-Identifier: Apache-2.0
*/
/*
* NOTE: This driver implements the GICv1 and GICv2 interfaces.
*/
#include <zephyr/device.h>
#include <zephyr/arch/cpu.h>
#include <zephyr/devicetree.h>
#include <zephyr/sw_isr_table.h>
#include <zephyr/dt-bindings/interrupt-controller/arm-gic.h>
#include <zephyr/drivers/interrupt_controller/gic.h>
#include <zephyr/sys/barrier.h>
#if defined(CONFIG_GIC_V1)
#define DT_DRV_COMPAT arm_gic_v1
#elif defined(CONFIG_GIC_V2)
#define DT_DRV_COMPAT arm_gic_v2
#else
#error "Unknown GIC controller compatible for this configuration"
#endif
static const uint64_t cpu_mpid_list[] = {
DT_FOREACH_CHILD_STATUS_OKAY_SEP(DT_PATH(cpus), DT_REG_ADDR, (,))
};
BUILD_ASSERT(ARRAY_SIZE(cpu_mpid_list) >= CONFIG_MP_MAX_NUM_CPUS,
"The count of CPU Cores nodes in dts is less than CONFIG_MP_MAX_NUM_CPUS\n");
void arm_gic_irq_enable(unsigned int irq)
{
int int_grp, int_off;
int_grp = irq / 32;
int_off = irq % 32;
sys_write32((1 << int_off), (GICD_ISENABLERn + int_grp * 4));
}
void arm_gic_irq_disable(unsigned int irq)
{
int int_grp, int_off;
int_grp = irq / 32;
int_off = irq % 32;
sys_write32((1 << int_off), (GICD_ICENABLERn + int_grp * 4));
}
bool arm_gic_irq_is_enabled(unsigned int irq)
{
int int_grp, int_off;
unsigned int enabler;
int_grp = irq / 32;
int_off = irq % 32;
enabler = sys_read32(GICD_ISENABLERn + int_grp * 4);
return (enabler & (1 << int_off)) != 0;
}
bool arm_gic_irq_is_pending(unsigned int irq)
{
int int_grp, int_off;
unsigned int enabler;
int_grp = irq / 32;
int_off = irq % 32;
enabler = sys_read32(GICD_ISPENDRn + int_grp * 4);
return (enabler & (1 << int_off)) != 0;
}
void arm_gic_irq_clear_pending(unsigned int irq)
{
int int_grp, int_off;
int_grp = irq / 32;
int_off = irq % 32;
sys_write32((1 << int_off), (GICD_ICPENDRn + int_grp * 4));
}
void arm_gic_irq_set_priority(
unsigned int irq, unsigned int prio, uint32_t flags)
{
int int_grp, int_off;
uint32_t val;
/* Set priority */
sys_write8(prio & 0xff, GICD_IPRIORITYRn + irq);
/* Set interrupt type */
int_grp = (irq / 16) * 4;
int_off = (irq % 16) * 2;
val = sys_read32(GICD_ICFGRn + int_grp);
val &= ~(GICD_ICFGR_MASK << int_off);
if (flags & IRQ_TYPE_EDGE) {
val |= (GICD_ICFGR_TYPE << int_off);
}
sys_write32(val, GICD_ICFGRn + int_grp);
}
unsigned int arm_gic_get_active(void)
{
unsigned int irq;
/*
* "ARM Generic Interrupt Controller Architecture version 2.0" states that
* [4.4.5 End of Interrupt Register, GICC_EOIR)]:
* """
* For compatibility with possible extensions to the GIC architecture
* specification, ARM recommends that software preserves the entire register
* value read from the GICC_IAR when it acknowledges the interrupt, and uses
* that entire value for its corresponding write to the GICC_EOIR.
* """
* Because of that, we read the entire value here, to be later written back to GICC_EOIR
*/
irq = sys_read32(GICC_IAR);
return irq;
}
void arm_gic_eoi(unsigned int irq)
{
/*
* Ensure the write to peripheral registers are *complete* before the write
* to GIC_EOIR.
*
* Note: The completion guarantee depends on various factors of system design
* and the barrier is the best core can do by which execution of further
* instructions waits till the barrier is alive.
*/
barrier_dsync_fence_full();
/* set to inactive */
sys_write32(irq, GICC_EOIR);
}
void gic_raise_sgi(unsigned int sgi_id, uint64_t target_aff,
uint16_t target_list)
{
uint32_t sgi_val;
ARG_UNUSED(target_aff);
sgi_val = GICD_SGIR_TGTFILT_CPULIST |
GICD_SGIR_CPULIST(target_list & GICD_SGIR_CPULIST_MASK) |
sgi_id;
barrier_dsync_fence_full();
sys_write32(sgi_val, GICD_SGIR);
barrier_isync_fence_full();
}
static void gic_dist_init(void)
{
unsigned int gic_irqs, i;
uint8_t cpu_mask = 0;
uint32_t reg_val;
gic_irqs = sys_read32(GICD_TYPER) & 0x1f;
gic_irqs = (gic_irqs + 1) * 32;
if (gic_irqs > 1020) {
gic_irqs = 1020;
}
/*
* Disable the forwarding of pending interrupts
* from the Distributor to the CPU interfaces
*/
sys_write32(0, GICD_CTLR);
/*
* Enable all global interrupts distributing to CPUs listed
* in dts with the count of arch_num_cpus().
*/
unsigned int num_cpus = arch_num_cpus();
for (i = 0; i < num_cpus; i++) {
cpu_mask |= BIT(cpu_mpid_list[i]);
}
reg_val = cpu_mask | (cpu_mask << 8) | (cpu_mask << 16)
| (cpu_mask << 24);
for (i = GIC_SPI_INT_BASE; i < gic_irqs; i += 4) {
sys_write32(reg_val, GICD_ITARGETSRn + i);
}
/*
* Set all global interrupts to be level triggered, active low.
*/
for (i = GIC_SPI_INT_BASE; i < gic_irqs; i += 16) {
sys_write32(0, GICD_ICFGRn + i / 4);
}
/* Set priority on all global interrupts. */
for (i = GIC_SPI_INT_BASE; i < gic_irqs; i += 4) {
sys_write32(0, GICD_IPRIORITYRn + i);
}
/* Set all interrupts to group 0 */
for (i = GIC_SPI_INT_BASE; i < gic_irqs; i += 32) {
sys_write32(0, GICD_IGROUPRn + i / 8);
}
/*
* Disable all interrupts. Leave the PPI and SGIs alone
* as these enables are banked registers.
*/
for (i = GIC_SPI_INT_BASE; i < gic_irqs; i += 32) {
#ifndef CONFIG_GIC_V1
sys_write32(0xffffffff, GICD_ICACTIVERn + i / 8);
#endif
sys_write32(0xffffffff, GICD_ICENABLERn + i / 8);
}
/*
* Enable the forwarding of pending interrupts
* from the Distributor to the CPU interfaces
*/
sys_write32(1, GICD_CTLR);
}
static void gic_cpu_init(void)
{
int i;
uint32_t val;
/*
* Deal with the banked PPI and SGI interrupts - disable all
* PPI interrupts, ensure all SGI interrupts are enabled.
*/
#ifndef CONFIG_GIC_V1
sys_write32(0xffffffff, GICD_ICACTIVERn);
#endif
sys_write32(0xffff0000, GICD_ICENABLERn);
sys_write32(0x0000ffff, GICD_ISENABLERn);
/*
* Set priority on PPI and SGI interrupts
*/
for (i = 0; i < 32; i += 4) {
sys_write32(0xa0a0a0a0, GICD_IPRIORITYRn + i);
}
sys_write32(0xf0, GICC_PMR);
/*
* Enable interrupts and signal them using the IRQ signal.
*/
val = sys_read32(GICC_CTLR);
#ifndef CONFIG_GIC_V1
val &= ~GICC_CTLR_BYPASS_MASK;
#endif
val |= GICC_CTLR_ENABLE_MASK;
sys_write32(val, GICC_CTLR);
}
#define GIC_PARENT_IRQ 0
#define GIC_PARENT_IRQ_PRI 0
#define GIC_PARENT_IRQ_FLAGS 0
/**
* @brief Initialize the GIC device driver
*/
int arm_gic_init(const struct device *dev)
{
/* Init of Distributor interface registers */
gic_dist_init();
/* Init CPU interface registers */
gic_cpu_init();
return 0;
}
DEVICE_DT_INST_DEFINE(0, arm_gic_init, NULL, NULL, NULL,
PRE_KERNEL_1, CONFIG_INTC_INIT_PRIORITY, NULL);
#ifdef CONFIG_SMP
void arm_gic_secondary_init(void)
{
/* Init CPU interface registers for each secondary core */
gic_cpu_init();
}
#endif