linux-kernel - [PATCH 09/11] pci, acpi, mcfg: Share ACPI PCI config space accessors.

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Message-Id: <1432644564-24746-10-git-send-email-hanjun.guo@linaro.org>
Date:	Tue, 26 May 2015 20:49:22 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yijing Wang <wangyijing@...wei.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Mark Salter <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,
	Hanjun Guo <hanjun.guo@...aro.org>
Subject: [PATCH 09/11] pci, acpi, mcfg: Share ACPI PCI config space accessors.

From: Tomasz Nowicki <tomasz.nowicki@...aro.org>

MCFG can be used perfectly for all architectures which support ACPI.
ACPI mandates MCFG to describe PCI config space ranges which means
we should use MMCONFIG accessors by default.

Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
---
 drivers/acpi/mcfg.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/acpi/mcfg.c b/drivers/acpi/mcfg.c
index 745b83e..90c81fa 100644
--- a/drivers/acpi/mcfg.c
+++ b/drivers/acpi/mcfg.c
@@ -12,6 +12,26 @@
 
 #define	PREFIX	"MCFG: "
 
+/*
+ * raw_pci_read/write - ACPI PCI config space accessors.
+ *
+ * ACPI spec defines MCFG table as the way we can describe access to PCI config
+ * space, so let MCFG be default (__weak).
+ *
+ * If platform needs more fancy stuff, should provides its own implementation.
+ */
+int __weak raw_pci_read(unsigned int domain, unsigned int bus,
+			unsigned int devfn, int reg, int len, u32 *val)
+{
+	return pci_mmcfg_read(domain, bus, devfn, reg, len, val);
+}
+
+int __weak raw_pci_write(unsigned int domain, unsigned int bus,
+			 unsigned int devfn, int reg, int len, u32 val)
+{
+	return pci_mmcfg_write(domain, bus, devfn, reg, len, val);
+}
+
 int __init acpi_parse_mcfg(struct acpi_table_header *header)
 {
 	struct acpi_table_mcfg *mcfg;
-- 
1.9.1

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