u-boot/arch/x86/cpu/irq.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

288 lines
7 KiB
C

// 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;
bool pirq_check_irq_routed(struct udevice *dev, int link, u8 irq)
{
struct irq_router *priv = dev_get_priv(dev);
u8 pirq;
int base = priv->link_base;
if (priv->config == PIRQ_VIA_PCI)
dm_pci_read_config8(dev->parent, LINK_N2V(link, base), &pirq);
else
pirq = readb((uintptr_t)priv->ibase + LINK_N2V(link, base));
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 LINK_V2N(link, priv->link_base);
}
void pirq_assign_irq(struct udevice *dev, int link, u8 irq)
{
struct irq_router *priv = dev_get_priv(dev);
int base = priv->link_base;
/* 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, LINK_N2V(link, base), irq);
else
writeb(irq, (uintptr_t)priv->ibase + LINK_N2V(link, base));
}
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 = LINK_N2V(pirq, priv->link_base);
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 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;
}
ret = fdtdec_get_int(blob, node, "intel,pirq-link", -1);
if (ret == -1)
return ret;
priv->link_base = ret;
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 !=
LINK_N2V(pr.pirq, priv->link_base))
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_common_init(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;
}
int irq_router_probe(struct udevice *dev)
{
return irq_router_common_init(dev);
}
ulong write_pirq_routing_table(ulong addr)
{
if (!gd->arch.pirq_routing_table)
return addr;
return copy_pirq_routing_table(addr, gd->arch.pirq_routing_table);
}
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),
};
UCLASS_DRIVER(irq) = {
.id = UCLASS_IRQ,
.name = "irq",
};