linux-kernel - [PATCH V5 02/15] acpi, pci, mcfg: Provide default RAW ACPI PCI config space accessors.

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Message-Id: <1455630825-27253-3-git-send-email-tn@semihalf.com>
Date:	Tue, 16 Feb 2016 14:53:32 +0100
From:	Tomasz Nowicki <tn@...ihalf.com>
To:	helgaas@...nel.org, arnd@...db.de, will.deacon@....com,
	catalin.marinas@....com, rafael@...nel.org, hanjun.guo@...aro.org,
	Lorenzo.Pieralisi@....com, okaya@...eaurora.org,
	jiang.liu@...ux.intel.com, jchandra@...adcom.com,
	Stefano.Stabellini@...citrix.com
Cc:	robert.richter@...iumnetworks.com, mw@...ihalf.com,
	Liviu.Dudau@....com, 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,
	jcm@...hat.com, Tomasz Nowicki <tn@...ihalf.com>
Subject: [PATCH V5 02/15] acpi, pci, mcfg: Provide default RAW ACPI PCI config space accessors.

Lets keep RAW ACPI PCI config space accessors empty by default,
since we are note sure if they are necessary accross all archs.
Once we sort this out, we can provide generic version or let
architectures to overwrite, like now x86.

Suggested-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Tested-by: Jeremy Linton <jeremy.linton@....com>
Tested-by: Duc Dang <dhdang@....com>
Tested-by: Dongdong Liu <liudongdong3@...wei.com>
Tested-by: Hanjun Guo <hanjun.guo@...aro.org>
Tested-by: Graeme Gregory <graeme.gregory@...aro.org>
Tested-by: Sinan Kaya <okaya@...eaurora.org>
---
 drivers/acpi/pci_mcfg.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
index ea84365..0467b00 100644
--- a/drivers/acpi/pci_mcfg.c
+++ b/drivers/acpi/pci_mcfg.c
@@ -21,6 +21,26 @@
 static DEFINE_MUTEX(pci_mmcfg_lock);
 LIST_HEAD(pci_mmcfg_list);
 
+/*
+ * raw_pci_read/write - raw ACPI PCI config space accessors.
+ *
+ * By defauly (__weak) these accessors are empty and should be overwritten
+ * by architectures which support operations on ACPI PCI_Config regions,
+ * see osl.c file.
+ */
+
+int __weak raw_pci_read(unsigned int domain, unsigned int bus,
+			unsigned int devfn, int reg, int len, u32 *val)
+{
+	return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+int __weak raw_pci_write(unsigned int domain, unsigned int bus,
+			 unsigned int devfn, int reg, int len, u32 val)
+{
+	return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
 static void list_add_sorted(struct pci_mmcfg_region *new)
 {
 	struct pci_mmcfg_region *cfg;
-- 
1.9.1