linux-kernel - [PATCH v2 1/4] arm64: Prepare to use generic ACPI PCI implementation

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Date:	Tue, 12 Apr 2016 04:15:04 +0530
From:	Jayachandran C <jchandra@...adcom.com>
To:	Bjorn Helgaas <helgaas@...nel.org>,
	Tomasz Nowicki <tn@...ihalf.com>, rafael@...nel.org
Cc:	Jayachandran C <jchandra@...adcom.com>,
	Arnd Bergmann <arnd@...db.de>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	okaya@...eaurora.org, jiang.liu@...ux.intel.com,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	robert.richter@...iumnetworks.com, Marcin Wojtas <mw@...ihalf.com>,
	Liviu.Dudau@....com, David Daney <ddaney@...iumnetworks.com>,
	wangyijing@...wei.com, Suravee.Suthikulpanit@....com,
	msalter@...hat.com, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
	Jon Masters <jcm@...hat.com>
Subject: [PATCH v2 1/4] arm64: Prepare to use generic ACPI PCI implementation

Define PCI_MMCONFIG config option for arm64.

Weaken implementations of raw_pci_read/write and pci_acpi_scan_root,
the generic ACPI PCI driver will implement these.

Signed-off-by: Jayachandran C <jchandra@...adcom.com>
---
 arch/arm64/Kconfig      | 3 +++
 arch/arm64/kernel/pci.c | 7 +++----
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 4f43622..6c6658a 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -236,6 +236,9 @@ config PCI_DOMAINS_GENERIC
 config PCI_SYSCALL
 	def_bool PCI
 
+config PCI_MMCONFIG
+	bool
+
 source "drivers/pci/Kconfig"
 
 endmenu
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index 15109c11..098028c 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -67,13 +67,13 @@ int pcibios_alloc_irq(struct pci_dev *dev)
 /*
  * raw_pci_read/write - Platform-specific PCI config space access.
  */
-int raw_pci_read(unsigned int domain, unsigned int bus,
+int __weak raw_pci_read(unsigned int domain, unsigned int bus,
 		  unsigned int devfn, int reg, int len, u32 *val)
 {
 	return -ENXIO;
 }
 
-int raw_pci_write(unsigned int domain, unsigned int bus,
+int __weak raw_pci_write(unsigned int domain, unsigned int bus,
 		unsigned int devfn, int reg, int len, u32 val)
 {
 	return -ENXIO;
@@ -81,9 +81,8 @@ int raw_pci_write(unsigned int domain, unsigned int bus,
 
 #ifdef CONFIG_ACPI
 /* Root bridge scanning */
-struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+struct pci_bus *__weak pci_acpi_scan_root(struct acpi_pci_root *root)
 {
-	/* TODO: Should be revisited when implementing PCI on ACPI */
 	return NULL;
 }
 #endif
-- 
1.9.1