u-boot/arch/x86/cpu/irq.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/pci.h>
#include <asm/pirq_routing.h>
#include <asm/tables.h>
DECLARE_GLOBAL_DATA_PTR;
/**
* pirq_reg_to_linkno() - Convert a PIRQ routing register offset to link number
*
* @priv: IRQ router driver's priv data
* @reg: PIRQ routing register offset from the base address
* @return: PIRQ link number (0 for PIRQA, 1 for PIRQB, etc)
*/
static inline int pirq_reg_to_linkno(struct irq_router *priv, int reg)
{
int linkno = 0;
if (priv->has_regmap) {
struct pirq_regmap *map = priv->regmap;
int i;
for (i = 0; i < priv->link_num; i++) {
if (reg - priv->link_base == map->offset) {
linkno = map->link;
break;
}
map++;
}
} else {
linkno = reg - priv->link_base;
}
return linkno;
}
/**
* pirq_linkno_to_reg() - Convert a PIRQ link number to routing register offset
*
* @priv: IRQ router driver's priv data
* @linkno: PIRQ link number (0 for PIRQA, 1 for PIRQB, etc)
* @return: PIRQ routing register offset from the base address
*/
static inline int pirq_linkno_to_reg(struct irq_router *priv, int linkno)
{
int reg = 0;
if (priv->has_regmap) {
struct pirq_regmap *map = priv->regmap;
int i;
for (i = 0; i < priv->link_num; i++) {
if (linkno == map->link) {
reg = map->offset + priv->link_base;
break;
}
map++;
}
} else {
reg = linkno + priv->link_base;
}
return reg;
}
bool pirq_check_irq_routed(struct udevice *dev, int link, u8 irq)
{
struct irq_router *priv = dev_get_priv(dev);
u8 pirq;
if (priv->config == PIRQ_VIA_PCI)
dm_pci_read_config8(dev->parent,
pirq_linkno_to_reg(priv, link), &pirq);
else
pirq = readb((uintptr_t)priv->ibase +
pirq_linkno_to_reg(priv, link));
pirq &= 0xf;
/* IRQ# 0/1/2/8/13 are reserved */
if (pirq < 3 || pirq == 8 || pirq == 13)
return false;
return pirq == irq ? true : false;
}
int pirq_translate_link(struct udevice *dev, int link)
{
struct irq_router *priv = dev_get_priv(dev);
return pirq_reg_to_linkno(priv, link);
}
void pirq_assign_irq(struct udevice *dev, int link, u8 irq)
{
struct irq_router *priv = dev_get_priv(dev);
/* IRQ# 0/1/2/8/13 are reserved */
if (irq < 3 || irq == 8 || irq == 13)
return;
if (priv->config == PIRQ_VIA_PCI)
dm_pci_write_config8(dev->parent,
pirq_linkno_to_reg(priv, link), irq);
else
writeb(irq, (uintptr_t)priv->ibase +
pirq_linkno_to_reg(priv, link));
}
static struct irq_info *check_dup_entry(struct irq_info *slot_base,
int entry_num, int bus, int device)
{
struct irq_info *slot = slot_base;
int i;
for (i = 0; i < entry_num; i++) {
if (slot->bus == bus && slot->devfn == (device << 3))
break;
slot++;
}
return (i == entry_num) ? NULL : slot;
}
static inline void fill_irq_info(struct irq_router *priv, struct irq_info *slot,
int bus, int device, int pin, int pirq)
{
slot->bus = bus;
slot->devfn = (device << 3) | 0;
slot->irq[pin - 1].link = pirq_linkno_to_reg(priv, pirq);
slot->irq[pin - 1].bitmap = priv->irq_mask;
}
static int create_pirq_routing_table(struct udevice *dev)
{
struct irq_router *priv = dev_get_priv(dev);
const void *blob = gd->fdt_blob;
int node;
int len, count;
const u32 *cell;
struct pirq_regmap *map;
struct irq_routing_table *rt;
struct irq_info *slot, *slot_base;
int irq_entries = 0;
int i;
int ret;
node = dev_of_offset(dev);
/* extract the bdf from fdt_pci_addr */
priv->bdf = dm_pci_get_bdf(dev->parent);
ret = fdt_stringlist_search(blob, node, "intel,pirq-config", "pci");
if (!ret) {
priv->config = PIRQ_VIA_PCI;
} else {
ret = fdt_stringlist_search(blob, node, "intel,pirq-config",
"ibase");
if (!ret)
priv->config = PIRQ_VIA_IBASE;
else
return -EINVAL;
}
cell = fdt_getprop(blob, node, "intel,pirq-link", &len);
if (!cell || len != 8)
return -EINVAL;
priv->link_base = fdt_addr_to_cpu(cell[0]);
priv->link_num = fdt_addr_to_cpu(cell[1]);
if (priv->link_num > CONFIG_MAX_PIRQ_LINKS) {
debug("Limiting supported PIRQ link number from %d to %d\n",
priv->link_num, CONFIG_MAX_PIRQ_LINKS);
priv->link_num = CONFIG_MAX_PIRQ_LINKS;
}
cell = fdt_getprop(blob, node, "intel,pirq-regmap", &len);
if (cell) {
if (len % sizeof(struct pirq_regmap))
return -EINVAL;
count = len / sizeof(struct pirq_regmap);
if (count < priv->link_num) {
printf("Number of pirq-regmap entires is wrong\n");
return -EINVAL;
}
count = priv->link_num;
priv->regmap = calloc(count, sizeof(struct pirq_regmap));
if (!priv->regmap)
return -ENOMEM;
priv->has_regmap = true;
map = priv->regmap;
for (i = 0; i < count; i++) {
map->link = fdt_addr_to_cpu(cell[0]);
map->offset = fdt_addr_to_cpu(cell[1]);
cell += sizeof(struct pirq_regmap) / sizeof(u32);
map++;
}
}
priv->irq_mask = fdtdec_get_int(blob, node,
"intel,pirq-mask", PIRQ_BITMAP);
if (IS_ENABLED(CONFIG_GENERATE_ACPI_TABLE)) {
/* Reserve IRQ9 for SCI */
priv->irq_mask &= ~(1 << 9);
}
if (priv->config == PIRQ_VIA_IBASE) {
int ibase_off;
ibase_off = fdtdec_get_int(blob, node, "intel,ibase-offset", 0);
if (!ibase_off)
return -EINVAL;
/*
* Here we assume that the IBASE register has already been
* properly configured by U-Boot before.
*
* By 'valid' we mean:
* 1) a valid memory space carved within system memory space
* assigned to IBASE register block.
* 2) memory range decoding is enabled.
* Hence we don't do any santify test here.
*/
dm_pci_read_config32(dev->parent, ibase_off, &priv->ibase);
priv->ibase &= ~0xf;
}
priv->actl_8bit = fdtdec_get_bool(blob, node, "intel,actl-8bit");
priv->actl_addr = fdtdec_get_int(blob, node, "intel,actl-addr", 0);
cell = fdt_getprop(blob, node, "intel,pirq-routing", &len);
if (!cell || len % sizeof(struct pirq_routing))
return -EINVAL;
count = len / sizeof(struct pirq_routing);
rt = calloc(1, sizeof(struct irq_routing_table));
if (!rt)
return -ENOMEM;
/* Populate the PIRQ table fields */
rt->signature = PIRQ_SIGNATURE;
rt->version = PIRQ_VERSION;
rt->rtr_bus = PCI_BUS(priv->bdf);
rt->rtr_devfn = (PCI_DEV(priv->bdf) << 3) | PCI_FUNC(priv->bdf);
rt->rtr_vendor = PCI_VENDOR_ID_INTEL;
rt->rtr_device = PCI_DEVICE_ID_INTEL_ICH7_31;
slot_base = rt->slots;
/* Now fill in the irq_info entries in the PIRQ table */
for (i = 0; i < count;
i++, cell += sizeof(struct pirq_routing) / sizeof(u32)) {
struct pirq_routing pr;
pr.bdf = fdt_addr_to_cpu(cell[0]);
pr.pin = fdt_addr_to_cpu(cell[1]);
pr.pirq = fdt_addr_to_cpu(cell[2]);
debug("irq_info %d: b.d.f %x.%x.%x INT%c PIRQ%c\n",
i, PCI_BUS(pr.bdf), PCI_DEV(pr.bdf),
PCI_FUNC(pr.bdf), 'A' + pr.pin - 1,
'A' + pr.pirq);
slot = check_dup_entry(slot_base, irq_entries,
PCI_BUS(pr.bdf), PCI_DEV(pr.bdf));
if (slot) {
debug("found entry for bus %d device %d, ",
PCI_BUS(pr.bdf), PCI_DEV(pr.bdf));
if (slot->irq[pr.pin - 1].link) {
debug("skipping\n");
/*
* Sanity test on the routed PIRQ pin
*
* If they don't match, show a warning to tell
* there might be something wrong with the PIRQ
* routing information in the device tree.
*/
if (slot->irq[pr.pin - 1].link !=
pirq_linkno_to_reg(priv, pr.pirq))
debug("WARNING: Inconsistent PIRQ routing information\n");
continue;
}
} else {
slot = slot_base + irq_entries++;
}
debug("writing INT%c\n", 'A' + pr.pin - 1);
fill_irq_info(priv, slot, PCI_BUS(pr.bdf), PCI_DEV(pr.bdf),
pr.pin, pr.pirq);
}
rt->size = irq_entries * sizeof(struct irq_info) + 32;
/* Fix up the table checksum */
rt->checksum = table_compute_checksum(rt, rt->size);
gd->arch.pirq_routing_table = rt;
return 0;
}
static void irq_enable_sci(struct udevice *dev)
{
struct irq_router *priv = dev_get_priv(dev);
if (priv->actl_8bit) {
/* Bit7 must be turned on to enable ACPI */
dm_pci_write_config8(dev->parent, priv->actl_addr, 0x80);
} else {
/* Write 0 to enable SCI on IRQ9 */
if (priv->config == PIRQ_VIA_PCI)
dm_pci_write_config32(dev->parent, priv->actl_addr, 0);
else
writel(0, (uintptr_t)priv->ibase + priv->actl_addr);
}
}
int irq_router_probe(struct udevice *dev)
{
int ret;
ret = create_pirq_routing_table(dev);
if (ret) {
debug("Failed to create pirq routing table\n");
return ret;
}
/* Route PIRQ */
pirq_route_irqs(dev, gd->arch.pirq_routing_table->slots,
get_irq_slot_count(gd->arch.pirq_routing_table));
if (IS_ENABLED(CONFIG_GENERATE_ACPI_TABLE))
irq_enable_sci(dev);
return 0;
}
static const struct udevice_id irq_router_ids[] = {
{ .compatible = "intel,irq-router" },
{ }
};
U_BOOT_DRIVER(irq_router_drv) = {
.name = "intel_irq",
.id = UCLASS_IRQ,
.of_match = irq_router_ids,
.probe = irq_router_probe,
.priv_auto_alloc_size = sizeof(struct irq_router),
};