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-rw-r--r--src/soc/amd/picasso/acpi/northbridge.asl12
-rw-r--r--src/soc/amd/picasso/acpi/pci_int.asl4
-rw-r--r--src/soc/amd/picasso/pcie_gpp.c156
3 files changed, 158 insertions, 14 deletions
diff --git a/src/soc/amd/picasso/acpi/northbridge.asl b/src/soc/amd/picasso/acpi/northbridge.asl
index a81d3b27be..f6e198f5f2 100644
--- a/src/soc/amd/picasso/acpi/northbridge.asl
+++ b/src/soc/amd/picasso/acpi/northbridge.asl
@@ -26,18 +26,6 @@ Name(PR0, Package(){
Package() { 0x0000FFFF, 0, INTC, 0 },
Package() { 0x0000FFFF, 0, INTD, 0 },
- /* Bus 0, Dev 0x01 - F[1-7]: GPP PCI Bridges */
- Package() { 0x0001FFFF, 0, INTA, 0 },
- Package() { 0x0001FFFF, 1, INTB, 0 },
- Package() { 0x0001FFFF, 2, INTC, 0 },
- Package() { 0x0001FFFF, 3, INTD, 0 },
-
- /* Bus 0, Dev 0x08 - F[1:PCI Bridge to Bus A, 2: PCI Bridge to Bus B] */
- Package() { 0x0008FFFF, 0, INTA, 0 },
- Package() { 0x0008FFFF, 1, INTB, 0 },
- Package() { 0x0008FFFF, 2, INTC, 0 },
- Package() { 0x0008FFFF, 3, INTD, 0 },
-
/* Bus 0, Dev 0x14 - F[0:SMBus 3:LPC] */
Package() { 0x0014FFFF, 0, INTA, 0 },
Package() { 0x0014FFFF, 1, INTB, 0 },
diff --git a/src/soc/amd/picasso/acpi/pci_int.asl b/src/soc/amd/picasso/acpi/pci_int.asl
index 8114c52043..feaec12d29 100644
--- a/src/soc/amd/picasso/acpi/pci_int.asl
+++ b/src/soc/amd/picasso/acpi/pci_int.asl
@@ -104,3 +104,7 @@ PCI_LINK(INTA, PIRA, IORA)
PCI_LINK(INTB, PIRB, IORB)
PCI_LINK(INTC, PIRC, IORC)
PCI_LINK(INTD, PIRD, IORD)
+PCI_LINK(INTE, PIRE, IORE)
+PCI_LINK(INTF, PIRF, IORF)
+PCI_LINK(INTG, PIRG, IORG)
+PCI_LINK(INTH, PIRH, IORH)
diff --git a/src/soc/amd/picasso/pcie_gpp.c b/src/soc/amd/picasso/pcie_gpp.c
index 3c3021e086..1b651182a4 100644
--- a/src/soc/amd/picasso/pcie_gpp.c
+++ b/src/soc/amd/picasso/pcie_gpp.c
@@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <acpi/acpigen.h>
+#include <assert.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pciexp.h>
@@ -8,6 +9,50 @@
#include <soc/pci_devs.h>
#include <stdio.h>
+/**
+ * Each PCI bridge has its INTx lines routed to one of the 8 GNB IOAPIC PCI
+ * groups. Each group has 4 interrupts. The INTx lines can be swizzled before
+ * being routed to the IOAPIC. If the IOAPIC redirection entry is masked, the
+ * interrupt is reduced modulo 8 onto INT[A-H] and forwarded to the FCH IOAPIC.
+ **/
+struct pci_routing {
+ unsigned int devfn;
+ unsigned int group;
+ const char intx[5];
+};
+
+/* See AMD PPR 55570 - IOAPIC Initialization for the table that AGESA sets up */
+static const struct pci_routing pci_routing_table[] = {
+ {PCIE_GPP_0_DEVFN, 0, "ABCD"},
+ {PCIE_GPP_1_DEVFN, 1, "ABCD"},
+ {PCIE_GPP_2_DEVFN, 2, "ABCD"},
+ {PCIE_GPP_3_DEVFN, 3, "ABCD"},
+ {PCIE_GPP_4_DEVFN, 4, "ABCD"},
+ {PCIE_GPP_5_DEVFN, 5, "ABCD"},
+ {PCIE_GPP_6_DEVFN, 6, "ABCD"},
+ {PCIE_GPP_A_DEVFN, 7, "ABCD"},
+ {PCIE_GPP_B_DEVFN, 7, "CDAB"},
+};
+
+static const struct pci_routing *get_pci_routing(unsigned int devfn)
+{
+ for (size_t i = 0; i < ARRAY_SIZE(pci_routing_table); ++i) {
+ if (devfn == pci_routing_table[i].devfn)
+ return &pci_routing_table[i];
+ }
+
+ return NULL;
+}
+
+static unsigned int calculate_irq(const struct pci_routing *pci_routing, unsigned int i)
+{
+ unsigned int irq_index;
+ irq_index = pci_routing->group * 4;
+ irq_index += pci_routing->intx[i] - 'A';
+
+ return irq_index;
+}
+
static const char *pcie_gpp_acpi_name(const struct device *dev)
{
if (dev->path.type != DEVICE_PATH_PCI)
@@ -37,6 +82,113 @@ static const char *pcie_gpp_acpi_name(const struct device *dev)
return NULL;
}
+static void acpigen_write_PRT(const struct device *dev)
+{
+ char link_template[] = "\\_SB.INTX";
+ unsigned int irq_index;
+
+ const struct pci_routing *pci_routing = get_pci_routing(dev->path.pci.devfn);
+ if (!pci_routing) {
+ printk(BIOS_ERR, "PCI routing table not found for %s\n", dev_path(dev));
+ return;
+ }
+
+ acpigen_write_method("_PRT", 0);
+ acpigen_emit_byte(RETURN_OP);
+
+ acpigen_write_package(4);
+ for (unsigned int i = 0; i < 4; ++i) {
+ irq_index = calculate_irq(pci_routing, i);
+
+ link_template[8] = 'A' + (irq_index % 8);
+
+ acpigen_write_package(4);
+ acpigen_write_dword(0x0000FFFF);
+ acpigen_write_byte(i);
+ acpigen_emit_namestring(link_template);
+ acpigen_write_dword(0);
+ acpigen_pop_len();
+ }
+ acpigen_pop_len(); /* Package */
+
+ acpigen_pop_len(); /* Method */
+}
+
+/*
+ * This function writes a PCI device with _ADR, _STA, and _PRT objects:
+ * Example:
+ * Scope (\_SB.PCI0)
+ * {
+ * Device (PBRA)
+ * {
+ * Name (_ADR, 0x0000000000080001) // _ADR: Address
+ * Method (_STA, 0, NotSerialized) // _STA: Status
+ * {
+ * Return (0x0F)
+ * }
+ *
+ * Method (_PRT, 0, NotSerialized) // _PRT: PCI Routing Table
+ * {
+ * Return (Package (0x04)
+ * {
+ * Package (0x04)
+ * {
+ * 0x0000FFFF,
+ * 0x00,
+ * \_SB.INTE,
+ * 0x00000000
+ * },
+ *
+ * Package (0x04)
+ * {
+ * 0x0000FFFF,
+ * 0x01,
+ * \_SB.INTF,
+ * 0x00000000
+ * },
+ *
+ * Package (0x04)
+ * {
+ * 0x0000FFFF,
+ * 0x02,
+ * \_SB.INTG,
+ * 0x00000000
+ * },
+ *
+ * Package (0x04)
+ * {
+ * 0x0000FFFF,
+ * 0x03,
+ * \_SB.INTH,
+ * 0x00000000
+ * }
+ * })
+ * }
+ * }
+ * }
+ */
+static void acpi_device_write_gpp_pci_dev(const struct device *dev)
+{
+ const char *scope = acpi_device_scope(dev);
+ const char *name = acpi_device_name(dev);
+
+ assert(dev->path.type == DEVICE_PATH_PCI);
+ assert(name);
+ assert(scope);
+
+ acpigen_write_scope(scope);
+ acpigen_write_device(name);
+
+ acpigen_write_ADR_pci_device(dev);
+ acpigen_write_STA(acpi_device_status(dev));
+
+ acpigen_write_PRT(dev);
+
+ acpigen_pop_len(); /* Device */
+ acpigen_pop_len(); /* Scope */
+}
+
+
static struct device_operations internal_pcie_gpp_ops = {
.read_resources = pci_bus_read_resources,
.set_resources = pci_dev_set_resources,
@@ -44,7 +196,7 @@ static struct device_operations internal_pcie_gpp_ops = {
.scan_bus = pci_scan_bridge,
.reset_bus = pci_bus_reset,
.acpi_name = pcie_gpp_acpi_name,
- .acpi_fill_ssdt = acpi_device_write_pci_dev,
+ .acpi_fill_ssdt = acpi_device_write_gpp_pci_dev,
};
static const unsigned short pci_device_ids[] = {
@@ -66,7 +218,7 @@ static struct device_operations external_pcie_gpp_ops = {
.scan_bus = pciexp_scan_bridge,
.reset_bus = pci_bus_reset,
.acpi_name = pcie_gpp_acpi_name,
- .acpi_fill_ssdt = acpi_device_write_pci_dev,
+ .acpi_fill_ssdt = acpi_device_write_gpp_pci_dev,
};
static const struct pci_driver external_pcie_gpp_driver __pci_driver = {
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-12 22:20:08 +0000