u-boot/arch/x86/cpu/irq.c
Bin Meng df81749db7 x86: Reduce PIRQ routing table size
There is no need to populate multiple irq info entries with the same
bus number and device number, but with different interrupt pin. We
can use the same entry to store all the 4 interrupt pin (INT A/B/C/D)
routing information to reduce the whole PIRQ routing table size.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-07-14 18:03:17 -06:00

262 lines
6.1 KiB
C

/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.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>
DECLARE_GLOBAL_DATA_PTR;
static struct irq_router irq_router;
static struct irq_routing_table *pirq_routing_table;
bool pirq_check_irq_routed(int link, u8 irq)
{
u8 pirq;
int base = irq_router.link_base;
if (irq_router.config == PIRQ_VIA_PCI)
pirq = x86_pci_read_config8(irq_router.bdf,
LINK_N2V(link, base));
else
pirq = readb(irq_router.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(int link)
{
return LINK_V2N(link, irq_router.link_base);
}
void pirq_assign_irq(int link, u8 irq)
{
int base = irq_router.link_base;
/* IRQ# 0/1/2/8/13 are reserved */
if (irq < 3 || irq == 8 || irq == 13)
return;
if (irq_router.config == PIRQ_VIA_PCI)
x86_pci_write_config8(irq_router.bdf,
LINK_N2V(link, base), irq);
else
writeb(irq, irq_router.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_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, irq_router.link_base);
slot->irq[pin - 1].bitmap = irq_router.irq_mask;
}
__weak void cpu_irq_init(void)
{
return;
}
static int create_pirq_routing_table(void)
{
const void *blob = gd->fdt_blob;
struct fdt_pci_addr addr;
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 = fdtdec_next_compatible(blob, 0, COMPAT_INTEL_IRQ_ROUTER);
if (node < 0) {
debug("%s: Cannot find irq router node\n", __func__);
return -EINVAL;
}
ret = fdtdec_get_pci_addr(blob, node, FDT_PCI_SPACE_CONFIG,
"reg", &addr);
if (ret)
return ret;
/* extract the bdf from fdt_pci_addr */
irq_router.bdf = addr.phys_hi & 0xffff00;
ret = fdt_find_string(blob, node, "intel,pirq-config", "pci");
if (!ret) {
irq_router.config = PIRQ_VIA_PCI;
} else {
ret = fdt_find_string(blob, node, "intel,pirq-config", "ibase");
if (!ret)
irq_router.config = PIRQ_VIA_IBASE;
else
return -EINVAL;
}
ret = fdtdec_get_int_array(blob, node, "intel,pirq-link",
&irq_router.link_base, 1);
if (ret)
return ret;
irq_router.irq_mask = fdtdec_get_int(blob, node,
"intel,pirq-mask", PIRQ_BITMAP);
if (irq_router.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.
*/
irq_router.ibase = x86_pci_read_config32(irq_router.bdf,
ibase_off);
irq_router.ibase &= ~0xf;
}
cell = fdt_getprop(blob, node, "intel,pirq-routing", &len);
if (!cell)
return -EINVAL;
if ((len % sizeof(struct pirq_routing)) == 0)
count = len / sizeof(struct pirq_routing);
else
return -EINVAL;
rt = malloc(sizeof(struct irq_routing_table));
if (!rt)
return -ENOMEM;
memset((char *)rt, 0, sizeof(struct irq_routing_table));
/* Populate the PIRQ table fields */
rt->signature = PIRQ_SIGNATURE;
rt->version = PIRQ_VERSION;
rt->rtr_bus = PCI_BUS(irq_router.bdf);
rt->rtr_devfn = (PCI_DEV(irq_router.bdf) << 3) |
PCI_FUNC(irq_router.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++) {
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, irq_router.link_base))
debug("WARNING: Inconsistent PIRQ routing information\n");
cell += sizeof(struct pirq_routing) /
sizeof(u32);
continue;
} else {
debug("writing INT%c\n", 'A' + pr.pin - 1);
fill_irq_info(slot, PCI_BUS(pr.bdf),
PCI_DEV(pr.bdf), pr.pin, pr.pirq);
cell += sizeof(struct pirq_routing) /
sizeof(u32);
continue;
}
}
slot = slot_base + irq_entries;
fill_irq_info(slot, PCI_BUS(pr.bdf), PCI_DEV(pr.bdf),
pr.pin, pr.pirq);
irq_entries++;
cell += sizeof(struct pirq_routing) / sizeof(u32);
}
rt->size = irq_entries * sizeof(struct irq_info) + 32;
pirq_routing_table = rt;
return 0;
}
void pirq_init(void)
{
cpu_irq_init();
if (create_pirq_routing_table()) {
debug("Failed to create pirq routing table\n");
} else {
/* Route PIRQ */
pirq_route_irqs(pirq_routing_table->slots,
get_irq_slot_count(pirq_routing_table));
}
}
u32 write_pirq_routing_table(u32 addr)
{
if (!pirq_routing_table)
return addr;
return copy_pirq_routing_table(addr, pirq_routing_table);
}