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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/pciexp.h>
#include <device/pci_ids.h>
#include <southbridge/intel/common/pciehp.h>
#include <assert.h>
#include "chip.h"
#include "pch.h"
static const char *pch_pcie_acpi_name(const struct device *dev)
{
ASSERT(dev);
if (PCI_SLOT(dev->path.pci.devfn) == 0x1c) {
static const char *names[] = { "RP01",
"RP02",
"RP03",
"RP04",
"RP05",
"RP06",
"RP07",
"RP08"};
return names[PCI_FUNC(dev->path.pci.devfn)];
}
return NULL;
}
static bool pci_is_hotplugable(struct device *dev)
{
struct southbridge_intel_bd82x6x_config *config = dev->chip_info;
return config && config->pcie_hotplug_map[PCI_FUNC(dev->path.pci.devfn)];
}
static void pch_pcie_pm_early(struct device *dev)
{
u16 link_width_p0, link_width_p4;
struct device *child = NULL;
u8 slot_power_limit = 10; /* 10W for x1 */
static u8 slot_number = 1;
u32 reg32, cap;
u8 reg8;
reg32 = RCBA32(RPC);
/* Port 0-3 link aggregation from PCIEPCS1[1:0] soft strap */
switch (reg32 & 3) {
case 3:
link_width_p0 = 4;
break;
case 1:
case 2:
link_width_p0 = 2;
break;
case 0:
default:
link_width_p0 = 1;
}
/* Port 4-7 link aggregation from PCIEPCS2[1:0] soft strap */
switch ((reg32 >> 2) & 3) {
case 3:
link_width_p4 = 4;
break;
case 1:
case 2:
link_width_p4 = 2;
break;
case 0:
default:
link_width_p4 = 1;
}
/* Enable dynamic clock gating where needed */
reg8 = pci_read_config8(dev, 0xe1);
switch (PCI_FUNC(dev->path.pci.devfn)) {
case 0: /* Port 0 */
if (link_width_p0 == 4)
slot_power_limit = 40; /* 40W for x4 */
else if (link_width_p0 == 2)
slot_power_limit = 20; /* 20W for x2 */
reg8 |= 0x3f;
break;
case 4: /* Port 4 */
if (link_width_p4 == 4)
slot_power_limit = 40; /* 40W for x4 */
else if (link_width_p4 == 2)
slot_power_limit = 20; /* 20W for x2 */
reg8 |= 0x3f;
break;
case 1: /* Port 1 only if Port 0 is x1 */
if (link_width_p0 == 1)
reg8 |= 0x3;
break;
case 2: /* Port 2 only if Port 0 is x1 or x2 */
case 3: /* Port 3 only if Port 0 is x1 or x2 */
if (link_width_p0 <= 2)
reg8 |= 0x3;
break;
case 5: /* Port 5 only if Port 4 is x1 */
if (link_width_p4 == 1)
reg8 |= 0x3;
break;
case 6: /* Port 7 only if Port 4 is x1 or x2 */
case 7: /* Port 7 only if Port 4 is x1 or x2 */
if (link_width_p4 <= 2)
reg8 |= 0x3;
break;
}
pci_write_config8(dev, 0xe1, reg8);
/* Set 0xE8[0] = 1 */
pci_or_config32(dev, 0xe8, 1);
/* Adjust Common Clock exit latency */
reg32 = pci_read_config32(dev, 0xd8);
reg32 &= ~(1 << 17);
reg32 |= (1 << 16) | (1 << 15);
reg32 &= ~(1 << 31); /* Disable PME# SCI for native PME handling */
pci_write_config32(dev, 0xd8, reg32);
cap = pci_find_capability(dev, PCI_CAP_ID_PCIE);
/* Adjust ASPM L1 exit latency */
reg32 = pci_read_config32(dev, cap + PCI_EXP_LNKCAP);
reg32 &= ~PCI_EXP_LNKCAP_L1EL;
if (RCBA32(CIR9) & (1 << 16)) {
/* If RCBA+2320[15]=1 set ASPM L1 to 8-16us */
reg32 |= (4 << 15);
} else {
/* Else set ASPM L1 to 2-4us */
reg32 |= (2 << 15);
}
pci_write_config32(dev, cap + PCI_EXP_LNKCAP, reg32);
/*
* PCI device enumeration hasn't started yet, thus any downstream device here
* must be a static device from devicetree.cb.
* If one is found assume it's an integrated device and not a PCIe slot.
*/
if (dev->downstream)
child = pcidev_path_behind(dev->downstream, PCI_DEVFN(0, 0));
/* Set slot power limit as configured above */
reg32 = pci_read_config32(dev, cap + PCI_EXP_SLTCAP);
if (pci_is_hotplugable(dev))
reg32 |= (PCI_EXP_SLTCAP_HPS | PCI_EXP_SLTCAP_HPC);
else
reg32 &= ~(PCI_EXP_SLTCAP_HPS | PCI_EXP_SLTCAP_HPC);
reg32 &= ~PCI_EXP_SLTCAP_SPLS; /* 16:15 = Slot power scale */
reg32 &= ~PCI_EXP_SLTCAP_SPLV; /* 14:7 = Slot power limit */
reg32 &= ~PCI_EXP_SLTCAP_PSN;
if (!child || !child->on_mainboard) {
/* Only PCIe slots have a power limit and slot number */
reg32 |= (slot_power_limit << 7);
reg32 |= (slot_number++ << 19);
}
pci_write_config32(dev, cap + PCI_EXP_SLTCAP, reg32);
}
static void pch_pcie_pm_late(struct device *dev)
{
struct southbridge_intel_bd82x6x_config *config = dev->chip_info;
enum aspm_type apmc = 0;
/* Set 0x314 = 0x743a361b */
pci_write_config32(dev, 0x314, 0x743a361b);
/* Set 0x318[31:16] = 0x1414 */
pci_update_config32(dev, 0x318, 0x0000ffff, 0x14140000);
/* Set 0x324[5] = 1 */
pci_or_config32(dev, 0x324, 1 << 5);
/* Set 0x330[7:0] = 0x40 */
pci_update_config32(dev, 0x330, ~0xff, 0x40);
/* Set 0x33C[24:0] = 0x854c74 */
pci_update_config32(dev, 0x33c, 0xff000000, 0x00854c74);
/* No IO-APIC, Disable EOI forwarding */
pci_or_config32(dev, 0xd4, 1 << 1);
/* Check for a rootport ASPM override */
apmc = config->pcie_aspm[PCI_FUNC(dev->path.pci.devfn)];
/* Setup the override or get the real ASPM setting */
if (apmc) {
pci_or_config32(dev, 0xd4, (apmc << 2) | (1 << 4));
} else {
apmc = pci_read_config32(dev, 0x50) & 3;
}
/* If both L0s and L1 enabled then set root port 0xE8[1]=1 */
if (apmc == PCIE_ASPM_BOTH)
pci_or_config32(dev, 0xe8, 1 << 1);
}
static void pci_init(struct device *dev)
{
u16 reg16;
printk(BIOS_DEBUG, "Initializing PCH 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, 0x0c, 0x10);
pci_and_config16(dev, PCI_BRIDGE_CONTROL, ~PCI_BRIDGE_CTL_PARITY);
/* 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);
/* Enable expresscard hotplug events. */
if (pci_is_hotplugable(dev))
pci_or_config32(dev, 0xd8, 1 << 30);
}
static void pch_pcie_enable(struct device *dev)
{
/* Power Management init before enumeration */
pch_pcie_pm_early(dev);
}
static void pch_pciexp_scan_bridge(struct device *dev)
{
uint32_t cap = pci_find_capability(dev, PCI_CAP_ID_PCIE);
if (CONFIG(PCIEXP_HOTPLUG) && pci_is_hotplugable(dev)) {
pciexp_hotplug_scan_bridge(dev);
} else {
/* Normal PCIe Scan */
pciexp_scan_bridge(dev);
}
if ((pci_read_config16(dev, cap + PCI_EXP_SLTSTA) & PCI_EXP_SLTSTA_PDS) &&
!dev_is_active_bridge(dev))
printk(BIOS_WARNING, "%s: Has a slow downstream device. Enumeration failed.\n",
dev_path(dev));
/* Late Power Management init after bridge device enumeration */
pch_pcie_pm_late(dev);
}
struct device_operations bd82x6x_pcie_rp_ops = {
.read_resources = pci_bus_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_bus_enable_resources,
.init = pci_init,
.enable = pch_pcie_enable,
.scan_bus = pch_pciexp_scan_bridge,
.acpi_name = pch_pcie_acpi_name,
.ops_pci = &pci_dev_ops_pci,
};
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