[PATCH 06/24] RISC-V: ACPI: Add PCI functions to build ACPI core

Sunil V L
2023-01-30T18:25:26Z

When CONFIG_PCI is enabled, ACPI core expects few arch
functions related to PCI. Add those functions so that
ACPI core gets build. These are levraged from arm64.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
---
arch/riscv/kernel/Makefile | 1 +
arch/riscv/kernel/pci.c | 173 +++++++++++++++++++++++++++++++++++++
2 files changed, 174 insertions(+)
create mode 100644 arch/riscv/kernel/pci.c

diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index f979dc8cf47d..e9d37639751d 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -92,3 +92,4 @@ obj-$(CONFIG_COMPAT) += compat_signal.o
obj-$(CONFIG_COMPAT) += compat_vdso/

obj-$(CONFIG_ACPI) += acpi.o
+obj-$(CONFIG_PCI) += pci.o
diff --git a/arch/riscv/kernel/pci.c b/arch/riscv/kernel/pci.c
new file mode 100644
index 000000000000..3388af3a67a0
--- /dev/null
+++ b/arch/riscv/kernel/pci.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Code borrowed from ARM64
+ *
+ * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
+ * Copyright (C) 2014 ARM Ltd.
+ * Copyright (C) 2022-2023 Ventana Micro System Inc.
+ */
+
+#include <linux/acpi.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/pci.h>
+#include <linux/pci-acpi.h>
+#include <linux/pci-ecam.h>
+
+#ifdef CONFIG_ACPI
+
+/*
+ * raw_pci_read/write - Platform-specific PCI config space access.
+ */
+int raw_pci_read(unsigned int domain, unsigned int bus,
+ unsigned int devfn, int reg, int len, u32 *val)
+{
+ struct pci_bus *b = pci_find_bus(domain, bus);
+
+ if (!b)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ return b->ops->read(b, devfn, reg, len, val);
+}
+
+int raw_pci_write(unsigned int domain, unsigned int bus,
+ unsigned int devfn, int reg, int len, u32 val)
+{
+ struct pci_bus *b = pci_find_bus(domain, bus);
+
+ if (!b)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ return b->ops->write(b, devfn, reg, len, val);
+}
+
+
+struct acpi_pci_generic_root_info {
+ struct acpi_pci_root_info common;
+ struct pci_config_window *cfg; /* config space mapping */
+};
+
+int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
+{
+ struct pci_config_window *cfg = bus->sysdata;
+ struct acpi_device *adev = to_acpi_device(cfg->parent);
+ struct acpi_pci_root *root = acpi_driver_data(adev);
+
+ return root->segment;
+}
+
+static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
+{
+ struct resource_entry *entry, *tmp;
+ int status;
+
+ status = acpi_pci_probe_root_resources(ci);
+ resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
+ if (!(entry->res->flags & IORESOURCE_WINDOW))
+ resource_list_destroy_entry(entry);
+ }
+ return status;
+}
+
+/*
+ * Lookup the bus range for the domain in MCFG, and set up config space
+ * mapping.
+ */
+static struct pci_config_window *
+pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
+{
+ struct device *dev = &root->device->dev;
+ struct resource *bus_res = &root->secondary;
+ u16 seg = root->segment;
+ const struct pci_ecam_ops *ecam_ops;
+ struct resource cfgres;
+ struct acpi_device *adev;
+ struct pci_config_window *cfg;
+ int ret;
+
+ ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
+ if (ret) {
+ dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
+ return NULL;
+ }
+
+ adev = acpi_resource_consumer(&cfgres);
+ if (adev)
+ dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres,
+ dev_name(&adev->dev));
+ else
+ dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n",
+ &cfgres);
+
+ cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
+ if (IS_ERR(cfg)) {
+ dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,
+ PTR_ERR(cfg));
+ return NULL;
+ }
+
+ return cfg;
+}
+
+/* release_info: free resources allocated by init_info */
+static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
+{
+ struct acpi_pci_generic_root_info *ri;
+
+ ri = container_of(ci, struct acpi_pci_generic_root_info, common);
+ pci_ecam_free(ri->cfg);
+ kfree(ci->ops);
+ kfree(ri);
+}
+
+
+/* Interface called from ACPI code to setup PCI host controller */
+struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+{
+ struct acpi_pci_generic_root_info *ri;
+ struct pci_bus *bus, *child;
+ struct acpi_pci_root_ops *root_ops;
+ struct pci_host_bridge *host;
+
+ ri = kzalloc(sizeof(*ri), GFP_KERNEL);
+ if (!ri)
+ return NULL;
+
+ root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL);
+ if (!root_ops) {
+ kfree(ri);
+ return NULL;
+ }
+
+ ri->cfg = pci_acpi_setup_ecam_mapping(root);
+ if (!ri->cfg) {
+ kfree(ri);
+ kfree(root_ops);
+ return NULL;
+ }
+
+ root_ops->release_info = pci_acpi_generic_release_info;
+ root_ops->prepare_resources = pci_acpi_root_prepare_resources;
+ root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops;
+ bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
+ if (!bus)
+ return NULL;
+
+ /* If we must preserve the resource configuration, claim now */
+ host = pci_find_host_bridge(bus);
+ if (host->preserve_config)
+ pci_bus_claim_resources(bus);
+
+ /*
+ * Assign whatever was left unassigned. If we didn't claim above,
+ * this will reassign everything.
+ */
+ pci_assign_unassigned_root_bus_resources(bus);
+
+ list_for_each_entry(child, &bus->children, node)
+ pcie_bus_configure_settings(child);
+
+ return bus;
+}
+
+#endif
--
2.38.0