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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <assert.h>
#include <console/console.h>
#include <post.h>
#include <device/pci.h>
#include <soc/chip_common.h>
#include <soc/soc_util.h>
#include <soc/util.h>
#include <stdlib.h>
static const STACK_RES *domain_to_stack_res(const struct device *dev)
{
assert(dev->path.type == DEVICE_PATH_DOMAIN);
const union xeon_domain_path dn = {
.domain_path = dev->path.domain.domain
};
const IIO_UDS *hob = get_iio_uds();
assert(hob != NULL);
return &hob->PlatformData.IIO_resource[dn.socket].StackRes[dn.stack];
}
void iio_pci_domain_read_resources(struct device *dev)
{
struct resource *res;
const STACK_RES *sr = domain_to_stack_res(dev);
if (!sr)
return;
int index = 0;
if (dev->path.domain.domain == 0) {
/* The 0 - 0xfff IO range is not reported by the HOB but still gets decoded */
res = new_resource(dev, index++);
res->base = 0;
res->size = 0x1000;
res->limit = 0xfff;
res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
}
if (sr->PciResourceIoBase < sr->PciResourceIoLimit) {
res = new_resource(dev, index++);
res->base = sr->PciResourceIoBase;
res->limit = sr->PciResourceIoLimit;
res->size = res->limit - res->base + 1;
res->flags = IORESOURCE_IO | IORESOURCE_ASSIGNED;
}
if (sr->PciResourceMem32Base < sr->PciResourceMem32Limit) {
res = new_resource(dev, index++);
res->base = sr->PciResourceMem32Base;
res->limit = sr->PciResourceMem32Limit;
res->size = res->limit - res->base + 1;
res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED;
}
if (sr->PciResourceMem64Base < sr->PciResourceMem64Limit) {
res = new_resource(dev, index++);
res->base = sr->PciResourceMem64Base;
res->limit = sr->PciResourceMem64Limit;
res->size = res->limit - res->base + 1;
res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED;
}
}
void iio_pci_domain_scan_bus(struct device *dev)
{
const STACK_RES *sr = domain_to_stack_res(dev);
if (!sr)
return;
struct bus *bus = alloc_bus(dev);
bus->secondary = sr->BusBase;
bus->subordinate = sr->BusBase;
bus->max_subordinate = sr->BusLimit;
printk(BIOS_SPEW, "Scanning IIO stack %d: busses %x-%x\n", dev->path.domain.domain,
dev->downstream->secondary, dev->downstream->max_subordinate);
pci_host_bridge_scan_bus(dev);
}
/*
* Used by IIO stacks for PCIe bridges. Those contain 1 PCI host bridges,
* all the bus numbers on the IIO stack can be used for this bridge
*/
static struct device_operations iio_pcie_domain_ops = {
.read_resources = iio_pci_domain_read_resources,
.set_resources = pci_domain_set_resources,
.scan_bus = iio_pci_domain_scan_bus,
};
/*
* Used by UBOX stacks. Those contain multiple PCI host bridges, each having
* only one bus with UBOX devices. UBOX devices have no resources.
*/
static struct device_operations ubox_pcie_domain_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.scan_bus = pci_host_bridge_scan_bus,
};
/*
* On the first Xeon-SP generations there are no separate UBOX stacks,
* and the UBOX devices reside on the first and second IIO. Starting
* with 3rd gen Xeon-SP the UBOX devices are located on their own IIO.
*/
static void soc_create_ubox_domains(const union xeon_domain_path dp, struct bus *upstream,
const unsigned int bus_base, const unsigned int bus_limit)
{
union xeon_domain_path new_path = {
.domain_path = dp.domain_path
};
for (int i = bus_base; i <= bus_limit; i++) {
new_path.bus = i;
struct device_path path = {
.type = DEVICE_PATH_DOMAIN,
.domain = {
.domain = new_path.domain_path,
},
};
struct device *const domain = alloc_dev(upstream, &path);
if (!domain)
die("%s: out of memory.\n", __func__);
domain->ops = &ubox_pcie_domain_ops;
struct bus *const bus = alloc_bus(domain);
bus->secondary = i;
bus->subordinate = bus->secondary;
bus->max_subordinate = bus->secondary;
}
}
/* Attach stack as domains */
void attach_iio_stacks(struct device *dev)
{
const IIO_UDS *hob = get_iio_uds();
union xeon_domain_path dn = { .domain_path = 0 };
if (!hob)
return;
for (int s = 0; s < hob->PlatformData.numofIIO; ++s) {
for (int x = 0; x < MAX_LOGIC_IIO_STACK; ++x) {
if (s == 0 && x == 0)
continue;
const STACK_RES *ri = &hob->PlatformData.IIO_resource[s].StackRes[x];
if (ri->BusBase > ri->BusLimit)
continue;
/* Prepare domain path */
dn.socket = s;
dn.stack = x;
dn.bus = ri->BusBase;
if (is_ubox_stack_res(ri)) {
soc_create_ubox_domains(dn, dev->upstream, ri->BusBase, ri->BusLimit);
} else if (is_pcie_iio_stack_res(ri)) {
struct device_path path;
path.type = DEVICE_PATH_DOMAIN;
path.domain.domain = dn.domain_path;
struct device *iio_domain = alloc_dev(dev->upstream, &path);
if (iio_domain == NULL)
die("%s: out of memory.\n", __func__);
iio_domain->ops = &iio_pcie_domain_ops;
} else if (CONFIG(HAVE_IOAT_DOMAINS))
soc_create_ioat_domains(dn, dev->upstream, ri);
}
}
}
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