linux-kernel - [RFC PATCH v1 06/21] RISC-V: ACPI: Implement PCI related functionality

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Message-Id: <20230803175916.3174453-7-sunilvl@ventanamicro.com>
Date:   Thu,  3 Aug 2023 23:29:01 +0530
From:   Sunil V L <sunilvl@...tanamicro.com>
To:     linux-doc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org
Cc:     Jonathan Corbet <corbet@....net>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Anup Patel <anup@...infault.org>,
        Marc Zyngier <maz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Robert Moore <robert.moore@...el.com>,
        Haibo Xu <haibo1.xu@...el.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Atish Kumar Patra <atishp@...osinc.com>,
        Sunil V L <sunilvl@...tanamicro.com>
Subject: [RFC PATCH v1 06/21] RISC-V: ACPI: Implement PCI related functionality

Replace the dummy implementation for PCI related functions
with actual implementation.

Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
 arch/riscv/kernel/acpi.c | 32 +++++++++++++++-----------------
 drivers/pci/pci-acpi.c   |  2 +-
 2 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c
index aa4433bca6d9..01022c5802ec 100644
--- a/arch/riscv/kernel/acpi.c
+++ b/arch/riscv/kernel/acpi.c
@@ -307,29 +307,27 @@ void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
 #ifdef CONFIG_PCI
 
 /*
- * These interfaces are defined just to enable building ACPI core.
- * TODO: Update it with actual implementation when external interrupt
- * controller support is added in RISC-V 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)
+int raw_pci_read(unsigned int domain, unsigned int bus,
+		 unsigned int devfn, int reg, int len, u32 *val)
 {
-	return PCIBIOS_DEVICE_NOT_FOUND;
-}
+	struct pci_bus *b = pci_find_bus(domain, bus);
 
-int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
-		  int reg, int len, u32 val)
-{
-	return PCIBIOS_DEVICE_NOT_FOUND;
-}
+	if (!b)
+		return PCIBIOS_DEVICE_NOT_FOUND;
 
-int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
-{
-	return -1;
+	return b->ops->read(b, devfn, reg, len, val);
 }
 
-struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+int raw_pci_write(unsigned int domain, unsigned int bus,
+		  unsigned int devfn, int reg, int len, u32 val)
 {
-	return NULL;
+	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);
 }
 #endif	/* CONFIG_PCI */
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index d6b2d64b8237..5af6188cdbe0 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -1521,7 +1521,7 @@ static int __init acpi_pci_init(void)
 
 arch_initcall(acpi_pci_init);
 
-#if defined(CONFIG_ARM64)
+#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 /*
  * Try to assign the IRQ number when probing a new device
  */
-- 
2.39.2