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/* SPDX-License-Identifier: GPL-2.0-only */
#include <assert.h>
#include <device/mmio.h>
#include <arch/ioapic.h>
#include <console/console.h>
#include <cpu/x86/lapic.h>
u32 io_apic_read(void *ioapic_base, u32 reg)
{
write32(ioapic_base, reg);
return read32(ioapic_base + 0x10);
}
void io_apic_write(void *ioapic_base, u32 reg, u32 value)
{
write32(ioapic_base, reg);
write32(ioapic_base + 0x10, value);
}
static void write_vector(void *ioapic_base, u8 vector, u32 high, u32 low)
{
io_apic_write(ioapic_base, vector * 2 + 0x10, low);
io_apic_write(ioapic_base, vector * 2 + 0x11, high);
printk(BIOS_SPEW, "IOAPIC: vector 0x%02x value 0x%08x 0x%08x\n",
vector, high, low);
}
/* Bits 23-16 of register 0x01 specify the maximum redirection entry, which
* is the number of interrupts minus 1. */
unsigned int ioapic_get_max_vectors(void *ioapic_base)
{
u32 reg;
u8 count;
reg = io_apic_read(ioapic_base, 0x01);
count = (reg >> 16) & 0xff;
if (count == 0xff)
count = 23;
count++;
printk(BIOS_DEBUG, "IOAPIC: %d interrupts\n", count);
return count;
}
/* Set maximum number of redirection entries (MRE). It is write-once register
* for some chipsets, and a negative mre_count will lock it to the number
* of vectors read from the register. */
void ioapic_set_max_vectors(void *ioapic_base, int mre_count)
{
u32 reg;
u8 count;
reg = io_apic_read(ioapic_base, 0x01);
count = (reg >> 16) & 0xff;
if (mre_count > 0)
count = mre_count - 1;
reg &= ~(0xff << 16);
reg |= count << 16;
io_apic_write(ioapic_base, 0x01, reg);
}
void ioapic_lock_max_vectors(void *ioapic_base)
{
ioapic_set_max_vectors(ioapic_base, -1);
}
static void clear_vectors(void *ioapic_base, u8 first, u8 last)
{
u32 low, high;
u8 i;
printk(BIOS_DEBUG, "IOAPIC: Clearing IOAPIC at %p\n", ioapic_base);
low = INT_DISABLED;
high = NONE;
for (i = first; i <= last; i++)
write_vector(ioapic_base, i, high, low);
if (io_apic_read(ioapic_base, 0x10) == 0xffffffff) {
printk(BIOS_WARNING, "IOAPIC not responding.\n");
return;
}
}
static void route_i8259_irq0(void *ioapic_base)
{
u32 bsp_lapicid = lapicid();
u32 low, high;
ASSERT(bsp_lapicid < 255);
printk(BIOS_DEBUG, "IOAPIC: Bootstrap Processor Local APIC = 0x%02x\n",
bsp_lapicid);
/* Enable Virtual Wire Mode. Should this be LOGICAL_DEST instead? */
low = INT_ENABLED | TRIGGER_EDGE | POLARITY_HIGH | PHYSICAL_DEST | ExtINT;
high = bsp_lapicid << (56 - 32);
write_vector(ioapic_base, 0, high, low);
if (io_apic_read(ioapic_base, 0x10) == 0xffffffff) {
printk(BIOS_WARNING, "IOAPIC not responding.\n");
return;
}
}
void set_ioapic_id(void *ioapic_base, u8 ioapic_id)
{
int i;
printk(BIOS_DEBUG, "IOAPIC: Initializing IOAPIC at %p\n",
ioapic_base);
if (ioapic_id) {
printk(BIOS_DEBUG, "IOAPIC: ID = 0x%02x\n", ioapic_id);
/* Set IOAPIC ID if it has been specified. */
io_apic_write(ioapic_base, 0x00,
(io_apic_read(ioapic_base, 0x00) & 0xf0ffffff) |
(ioapic_id << 24));
}
printk(BIOS_SPEW, "IOAPIC: Dumping registers\n");
for (i = 0; i < 3; i++)
printk(BIOS_SPEW, " reg 0x%04x: 0x%08x\n", i,
io_apic_read(ioapic_base, i));
}
u8 get_ioapic_id(void *ioapic_base)
{
return (io_apic_read(ioapic_base, 0x00) >> 24) & 0x0f;
}
u8 get_ioapic_version(void *ioapic_base)
{
return io_apic_read(ioapic_base, 0x01) & 0xff;
}
void ioapic_set_boot_config(void *ioapic_base, bool irq_on_fsb)
{
if (irq_on_fsb) {
/*
* For the Pentium 4 and above APICs deliver their interrupts
* on the front side bus, enable that.
*/
printk(BIOS_DEBUG, "IOAPIC: Enabling interrupts on FSB\n");
io_apic_write(ioapic_base, 0x03,
io_apic_read(ioapic_base, 0x03) | (1 << 0));
} else {
printk(BIOS_DEBUG,
"IOAPIC: Enabling interrupts on APIC serial bus\n");
io_apic_write(ioapic_base, 0x03, 0);
}
}
void setup_ioapic(void *ioapic_base, u8 ioapic_id)
{
set_ioapic_id(ioapic_base, ioapic_id);
clear_vectors(ioapic_base, 0, ioapic_get_max_vectors(ioapic_base) - 1);
route_i8259_irq0(ioapic_base);
}
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