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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ops.h>
#include <device/pci_ids.h>
#include "chip.h"
#include "i82801gx.h"
/* Low Power variant has 6 root ports. */
#define NUM_ROOT_PORTS 6
struct root_port_config {
/* RPFN is a write-once register so keep a copy until it is written */
u32 orig_rpfn;
u32 new_rpfn;
int num_ports;
struct device *ports[NUM_ROOT_PORTS];
};
static struct root_port_config rpc;
static inline int root_port_is_first(struct device *dev)
{
return PCI_FUNC(dev->path.pci.devfn) == 0;
}
static inline int root_port_is_last(struct device *dev)
{
return PCI_FUNC(dev->path.pci.devfn) == (rpc.num_ports - 1);
}
/* Root ports are numbered 1..N in the documentation. */
static inline int root_port_number(struct device *dev)
{
return PCI_FUNC(dev->path.pci.devfn) + 1;
}
static void pci_init(struct device *dev)
{
u16 reg16;
printk(BIOS_DEBUG, "Initializing ICH7 PCIe bridge.\n");
/* Enable Bus Master */
pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER);
/* Set Cache Line Size to 0x10 */
// This has no effect but the OS might expect it
pci_write_config8(dev, PCI_CACHE_LINE_SIZE, 0x10);
pci_and_config16(dev, PCI_BRIDGE_CONTROL, ~PCI_BRIDGE_CTL_PARITY);
/* Enable IO xAPIC on this PCIe port */
pci_or_config32(dev, 0xd8, 1 << 7);
/* Enable Backbone Clock Gating */
pci_or_config32(dev, 0xe1, (1 << 3) | (1 << 2) | (1 << 1) | (1 << 0));
/* Set VC0 transaction class */
pci_update_config32(dev, 0x114, ~0x000000ff, 1);
/* Mask completion timeouts */
pci_or_config32(dev, 0x148, 1 << 14);
/* Enable common clock configuration */
// Are there cases when we don't want that?
pci_or_config16(dev, 0x50, 1 << 6);
/* Clear errors in status registers. FIXME: Do something? */
reg16 = pci_read_config16(dev, 0x06);
//reg16 |= 0xf900;
pci_write_config16(dev, 0x06, reg16);
reg16 = pci_read_config16(dev, 0x1e);
//reg16 |= 0xf900;
pci_write_config16(dev, 0x1e, reg16);
}
static int get_num_ports(void)
{
struct device *dev = pcidev_on_root(31, 0);
if (pci_read_config32(dev, FDVCT) & PCIE_4_PORTS_MAX)
return 4;
else
return 6;
}
static void root_port_init_config(struct device *dev)
{
int rp;
if (root_port_is_first(dev)) {
rpc.orig_rpfn = RCBA32(RPFN);
rpc.new_rpfn = rpc.orig_rpfn;
rpc.num_ports = get_num_ports();
}
rp = root_port_number(dev);
if (rp > rpc.num_ports) {
printk(BIOS_ERR, "Found Root Port %d, expecting %d\n", rp, rpc.num_ports);
return;
}
/* Cache pci device. */
rpc.ports[rp - 1] = dev;
}
/* Update devicetree with new Root Port function number assignment */
static void ich_pcie_device_set_func(int index, int pci_func)
{
struct device *dev;
unsigned int new_devfn;
dev = rpc.ports[index];
/* Set the new PCI function field for this Root Port. */
rpc.new_rpfn &= ~RPFN_FNMASK(index);
rpc.new_rpfn |= RPFN_FNSET(index, pci_func);
/* Determine the new devfn for this port */
new_devfn = PCI_DEVFN(ICH_PCIE_DEV_SLOT, pci_func);
if (dev->path.pci.devfn != new_devfn) {
printk(BIOS_DEBUG,
"ICH: PCIe map %02x.%1x -> %02x.%1x\n",
PCI_SLOT(dev->path.pci.devfn),
PCI_FUNC(dev->path.pci.devfn),
PCI_SLOT(new_devfn), PCI_FUNC(new_devfn));
dev->path.pci.devfn = new_devfn;
}
}
static void root_port_commit_config(struct device *dev)
{
int i;
bool coalesce = false;
if (dev->chip_info != nullptr) {
const struct southbridge_intel_i82801gx_config *config = dev->chip_info;
coalesce = config->pcie_port_coalesce;
}
if (!rpc.ports[0]->enabled)
coalesce = true;
for (i = 0; i < rpc.num_ports; i++) {
struct device *pcie_dev;
pcie_dev = rpc.ports[i];
if (pcie_dev == nullptr) {
printk(BIOS_ERR, "Root Port %d device is nullptr?\n", i + 1);
continue;
}
if (pcie_dev->enabled)
continue;
printk(BIOS_DEBUG, "%s: Disabling device\n", dev_path(pcie_dev));
/* Disable this device if possible */
i82801gx_enable(pcie_dev);
}
if (coalesce) {
int current_func;
/* For all Root Ports N enabled ports get assigned the lower
* PCI function number. The disabled ones get upper PCI
* function numbers. */
current_func = 0;
for (i = 0; i < rpc.num_ports; i++) {
if (!rpc.ports[i]->enabled)
continue;
ich_pcie_device_set_func(i, current_func);
current_func++;
}
/* Allocate the disabled devices' PCI function number. */
for (i = 0; i < rpc.num_ports; i++) {
if (rpc.ports[i]->enabled)
continue;
ich_pcie_device_set_func(i, current_func);
current_func++;
}
}
printk(BIOS_SPEW, "ICH: RPFN 0x%08x -> 0x%08x\n", rpc.orig_rpfn, rpc.new_rpfn);
RCBA32(RPFN) = rpc.new_rpfn;
}
static void ich_pcie_enable(struct device *dev)
{
/* Add this device to the root port config structure. */
root_port_init_config(dev);
/*
* When processing the last PCIe root port we can now
* update the Root Port Function Number and Hide register.
*/
if (root_port_is_last(dev))
root_port_commit_config(dev);
}
static struct device_operations device_ops = {
.read_resources = pci_bus_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_bus_enable_resources,
.init = pci_init,
.enable = ich_pcie_enable,
.scan_bus = pci_scan_bridge,
.ops_pci = &pci_dev_ops_pci,
};
static const unsigned short i82801gx_pcie_ids[] = {
0x27d0, /* 82801GB/GR/GDH/GBM/GHM (ICH7/ICH7R/ICH7DH/ICH7-M/ICH7-M DH) */
0x27d2, /* 82801GB/GR/GDH/GBM/GHM (ICH7/ICH7R/ICH7DH/ICH7-M/ICH7-M DH) */
0x27d4, /* 82801GB/GR/GDH/GBM/GHM (ICH7/ICH7R/ICH7DH/ICH7-M/ICH7-M DH) */
0x27d6, /* 82801GB/GR/GDH/GBM/GHM (ICH7/ICH7R/ICH7DH/ICH7-M/ICH7-M DH) */
0x27e0, /* 82801GR/GDH/GHM (ICH7R/ICH7DH/ICH7-M DH) */
0x27e2, /* 82801GR/GDH/GHM (ICH7R/ICH7DH/ICH7-M DH) */
0
};
static const struct pci_driver i82801gx_pcie __pci_driver = {
.ops = &device_ops,
.vendor = PCI_VID_INTEL,
.devices = i82801gx_pcie_ids,
};
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