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PCI: rcar: Add gen2 device tree support 

Add device tree probing support to the 'pci-rcar-gen2' driver.

[Sergei: numerous fixes/cleanups/additions]
[bhelgaas: whitespace fix]
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Ben Dooks 2014-05-20 01:10:20 +04:00 committed by Bjorn Helgaas
parent 7869fc6e29
commit d47b62f4b1
2 changed files with 95 additions and 2 deletions
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66
Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt Normal file
View File

@ -0,0 +1,66 @@
Renesas AHB to PCI bridge
-------------------------
This is the bridge used internally to connect the USB controllers to the
AHB. There is one bridge instance per USB port connected to the internal
OHCI and EHCI controllers.
Required properties:
- compatible: "renesas,pci-r8a7790" for the R8A7790 SoC;
"renesas,pci-r8a7791" for the R8A7791 SoC.
- reg: A list of physical regions to access the device: the first is
the operational registers for the OHCI/EHCI controllers and the
second is for the bridge configuration and control registers.
- interrupts: interrupt for the device.
- clocks: The reference to the device clock.
- bus-range: The PCI bus number range; as this is a single bus, the range
should be specified as the same value twice.
- #address-cells: must be 3.
- #size-cells: must be 2.
- #interrupt-cells: must be 1.
- interrupt-map: standard property used to define the mapping of the PCI
interrupts to the GIC interrupts.
- interrupt-map-mask: standard property that helps to define the interrupt
mapping.
Example SoC configuration:
pci0: pci@ee090000 {
compatible = "renesas,pci-r8a7790";
clocks = <&mstp7_clks R8A7790_CLK_EHCI>;
reg = <0x0 0xee090000 0x0 0xc00>,
<0x0 0xee080000 0x0 0x1100>;
interrupts = <0 108 IRQ_TYPE_LEVEL_HIGH>;
status = "disabled";
bus-range = <0 0>;
#address-cells = <3>;
#size-cells = <2>;
#interrupt-cells = <1>;
interrupt-map-mask = <0xff00 0 0 0x7>;
interrupt-map = <0x0000 0 0 1 &gic 0 108 IRQ_TYPE_LEVEL_HIGH
0x0800 0 0 1 &gic 0 108 IRQ_TYPE_LEVEL_HIGH
0x1000 0 0 2 &gic 0 108 IRQ_TYPE_LEVEL_HIGH>;
pci@0,1 {
reg = <0x800 0 0 0 0>;
device_type = "pci";
phys = <&usbphy 0 0>;
phy-names = "usb";
};
pci@0,2 {
reg = <0x1000 0 0 0 0>;
device_type = "pci";
phys = <&usbphy 0 0>;
phy-names = "usb";
};
};
Example board setup:
&pci0 {
status = "okay";
pinctrl-0 = <&usb0_pins>;
pinctrl-names = "default";
};

31
drivers/pci/host/pci-rcar-gen2.c
View File

@ -99,6 +99,7 @@ struct rcar_pci_priv {
struct resource io_res;
struct resource mem_res;
struct resource *cfg_res;
unsigned busnr;
int irq;
unsigned long window_size;
};
@ -318,8 +319,8 @@ static int rcar_pci_setup(int nr, struct pci_sys_data *sys)
pci_add_resource(&sys->resources, &priv->io_res);
pci_add_resource(&sys->resources, &priv->mem_res);
/* Setup bus number based on platform device id */
sys->busnr = to_platform_device(priv->dev)->id;
/* Setup bus number based on platform device id / of bus-range */
sys->busnr = priv->busnr;
return 1;
}
@ -372,6 +373,23 @@ static int rcar_pci_probe(struct platform_device *pdev)
priv->window_size = SZ_1G;
if (pdev->dev.of_node) {
struct resource busnr;
int ret;
ret = of_pci_parse_bus_range(pdev->dev.of_node, &busnr);
if (ret < 0) {
dev_err(&pdev->dev, "failed to parse bus-range\n");
return ret;
}
priv->busnr = busnr.start;
if (busnr.end != busnr.start)
dev_warn(&pdev->dev, "only one bus number supported\n");
} else {
priv->busnr = pdev->id;
}
hw_private[0] = priv;
memset(&hw, 0, sizeof(hw));
hw.nr_controllers = ARRAY_SIZE(hw_private);
@ -383,11 +401,20 @@ static int rcar_pci_probe(struct platform_device *pdev)
return 0;
}
static struct of_device_id rcar_pci_of_match[] = {
{ .compatible = "renesas,pci-r8a7790", },
{ .compatible = "renesas,pci-r8a7791", },
{ },
};
MODULE_DEVICE_TABLE(of, rcar_pci_of_match);
static struct platform_driver rcar_pci_driver = {
.driver = {
.name = "pci-rcar-gen2",
.owner = THIS_MODULE,
.suppress_bind_attrs = true,
.of_match_table = rcar_pci_of_match,
},
.probe = rcar_pci_probe,
};