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of: Allows to use the PCI translator without the PCI core 

Translating an address from a PCI node of the device-tree into a CPU
physical address doesn't require the core PCI support. Those
translations are just related to the device tree itself.

The use case to translate an address from a PCI node without actually
using the PCI core support is when one needs to access the PCI
controller without accessing any PCI devices.

Marvell SoCs, such as Kirkwood, Dove or Armada XP for instance, come
with an IP of a PCI controller. In the registers of this controller
are stored the ID and the revision of a SoC. With this patch it will
be possible to read the SoC ID of a board without any PCI device and
then without the PCI core support.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Reviewed-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Gregory CLEMENT 2014-02-19 23:14:55 +01:00 committed by Grant Likely
parent b66548e2a9
commit 25a31579ea
2 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/of/Kconfig
View File

@ -44,6 +44,10 @@ config OF_DYNAMIC
config OF_ADDRESS config OF_ADDRESS
def_bool y def_bool y
depends on !SPARC depends on !SPARC
select OF_ADDRESS_PCI if PCI
config OF_ADDRESS_PCI
bool
config OF_IRQ config OF_IRQ
def_bool y def_bool y

8
drivers/of/address.c
View File

@ -91,7 +91,7 @@ static unsigned int of_bus_default_get_flags(const __be32 *addr)
return IORESOURCE_MEM; return IORESOURCE_MEM;
} }
#ifdef CONFIG_PCI #ifdef CONFIG_OF_ADDRESS_PCI
/* /*
* PCI bus specific translator * PCI bus specific translator
*/ */
@ -165,7 +165,9 @@ static int of_bus_pci_translate(__be32 *addr, u64 offset, int na)
{ {
return of_bus_default_translate(addr + 1, offset, na - 1); return of_bus_default_translate(addr + 1, offset, na - 1);
} }
#endif /* CONFIG_OF_ADDRESS_PCI */
#ifdef CONFIG_PCI
const __be32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size, const __be32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
unsigned int *flags) unsigned int *flags)
{ {
@ -355,7 +357,7 @@ static unsigned int of_bus_isa_get_flags(const __be32 *addr)
*/ */
static struct of_bus of_busses[] = { static struct of_bus of_busses[] = {
#ifdef CONFIG_PCI #ifdef CONFIG_OF_ADDRESS_PCI
/* PCI */ /* PCI */
{ {
.name = "pci", .name = "pci",
@ -366,7 +368,7 @@ static struct of_bus of_busses[] = {
.translate = of_bus_pci_translate, .translate = of_bus_pci_translate,
.get_flags = of_bus_pci_get_flags, .get_flags = of_bus_pci_get_flags,
}, },
#endif /* CONFIG_PCI */ #endif /* CONFIG_OF_ADDRESS_PCI */
/* ISA */ /* ISA */
{ {
.name = "isa", .name = "isa",