diff mbox

[v8,06/21] ARM64 / ACPI: Introduce PCI stub functions for ACPI

Message ID 1422881149-8177-7-git-send-email-hanjun.guo@linaro.org
State New
Headers show

Commit Message

Hanjun Guo Feb. 2, 2015, 12:45 p.m. UTC 
CONFIG_ACPI depends CONFIG_PCI on x86 and ia64, in ARM64 server
world we will have PCIe in most cases, but some of them may not,
make CONFIG_ACPI depend CONFIG_PCI on ARM64 will satisfy both.

With that case, we need some arch dependent PCI functions to
access the config space before the PCI root bridge is created, and
pci_acpi_scan_root() to create the PCI root bus. So introduce
some stub function here to make ACPI core compile and revisit
them later when implemented on ARM64.

CC: Liviu Dudau <Liviu.Dudau@arm.com>
CC: Catalin Marinas <catalin.marinas@arm.com>
CC: Will Deacon <will.deacon@arm.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Yijing Wang <wangyijing@huawei.com>
Tested-by: Mark Langsdorf <mlangsdo@redhat.com>
Tested-by: Jon Masters <jcm@redhat.com>
Tested-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/include/asm/pci.h |  6 ++++++
 arch/arm64/kernel/pci.c      | 25 +++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

Comments

Hanjun Guo Feb. 3, 2015, 1:30 p.m. UTC | #1 
On 2015年02月03日 20:15, Catalin Marinas wrote:
> On Mon, Feb 02, 2015 at 12:45:34PM +0000, Hanjun Guo wrote:
>> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
>> index ce5836c..c17e7ea 100644
>> --- a/arch/arm64/kernel/pci.c
>> +++ b/arch/arm64/kernel/pci.c
>> @@ -10,6 +10,7 @@
>>    *
>>    */
>>
>> +#include <linux/acpi.h>
>>   #include <linux/init.h>
>>   #include <linux/io.h>
>>   #include <linux/kernel.h>
>> @@ -68,3 +69,27 @@ void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
>>   	bus->domain_nr = domain;
>>   }
>>   #endif
>> +
>> +/*
>> + * 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)
>> +{
>> +	return -EINVAL;
>> +}
>> +
>> +int raw_pci_write(unsigned int domain, unsigned int bus,
>> +		unsigned int devfn, int reg, int len, u32 val)
>> +{
>> +	return -EINVAL;
>> +}
>
> You said you'll make these return -ENOSYS, which I think makes more
> sense.

I'm sorry, I missed that, my bad, I will fix that in next version.

Thanks
Hanjun
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Hanjun Guo Feb. 4, 2015, 9:06 a.m. UTC | #2 
On 2015年02月03日 22:55, Rafael J. Wysocki wrote:
> On Tuesday, February 03, 2015 09:30:00 PM Hanjun Guo wrote:
>> On 2015年02月03日 20:15, Catalin Marinas wrote:
>>> On Mon, Feb 02, 2015 at 12:45:34PM +0000, Hanjun Guo wrote:
>>>> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
>>>> index ce5836c..c17e7ea 100644
>>>> --- a/arch/arm64/kernel/pci.c
>>>> +++ b/arch/arm64/kernel/pci.c
>>>> @@ -10,6 +10,7 @@
>>>>     *
>>>>     */
>>>>
>>>> +#include <linux/acpi.h>
>>>>    #include <linux/init.h>
>>>>    #include <linux/io.h>
>>>>    #include <linux/kernel.h>
>>>> @@ -68,3 +69,27 @@ void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
>>>>    	bus->domain_nr = domain;
>>>>    }
>>>>    #endif
>>>> +
>>>> +/*
>>>> + * 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)
>>>> +{
>>>> +	return -EINVAL;
>>>> +}
>>>> +
>>>> +int raw_pci_write(unsigned int domain, unsigned int bus,
>>>> +		unsigned int devfn, int reg, int len, u32 val)
>>>> +{
>>>> +	return -EINVAL;
>>>> +}
>>>
>>> You said you'll make these return -ENOSYS, which I think makes more
>>> sense.
>>
>> I'm sorry, I missed that, my bad, I will fix that in next version.
>
> Actually, -ENOSYS *specifically* means "not implemented system call".
> It should not be used for anything other than that.  -ENXIO is what
> should be used instead.

Thanks for the suggestion :)

Hanjun
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diff mbox

Patch

diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
index 872ba93..fded096 100644
--- a/arch/arm64/include/asm/pci.h
+++ b/arch/arm64/include/asm/pci.h
@@ -24,6 +24,12 @@ 
  */
 #define PCI_DMA_BUS_IS_PHYS	(0)
 
+static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
+{
+	/* no legacy IRQ on arm64 */
+	return -ENODEV;
+}
+
 extern int isa_dma_bridge_buggy;
 
 #ifdef CONFIG_PCI
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index ce5836c..c17e7ea 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -10,6 +10,7 @@ 
  *
  */
 
+#include <linux/acpi.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
@@ -68,3 +69,27 @@  void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
 	bus->domain_nr = domain;
 }
 #endif
+
+/*
+ * 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)
+{
+	return -EINVAL;
+}
+
+int raw_pci_write(unsigned int domain, unsigned int bus,
+		unsigned int devfn, int reg, int len, u32 val)
+{
+	return -EINVAL;
+}
+
+#ifdef CONFIG_ACPI
+/* Root bridge scanning */
+struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+{
+	/* TODO: Should be revisited when implementing PCI on ACPI */
+	return NULL;
+}
+#endif