[PATCH 3/9] of: address: Add device type pci-ep

Frank Li
2024-09-19T22:08:33Z

The PCI bus device tree supports 'ranges' properties that indicate how to
convert PCI addresses to CPU addresses. Many PCI controllers are dual-role
controllers, supporting both Root Complex (RC) and Endpoint (EP) modes. The
EP side also needs similar information for proper address translation.

Add device type 'pci-ep' and use the same PCI address parser function to
parser PCI EP's ranges property.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
drivers/of/address.c | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index d886f16df8a6e..c98e212d53dc1 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -117,13 +117,13 @@ static int of_bus_default_flags_translate(__be32 *addr, u64 offset, int na)
return of_bus_default_translate(addr + 1, offset, na - 1);
}

-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) || defined(CONFIG_PCI_ENDPOINT)
static unsigned int of_bus_pci_get_flags(const __be32 *addr)
{
unsigned int flags = 0;
u32 w = be32_to_cpup(addr);

- if (!IS_ENABLED(CONFIG_PCI))
+ if (!IS_ENABLED(CONFIG_PCI) && !IS_ENABLED(CONFIG_PCI_ENDPOINT))
return 0;

switch((w >> 24) & 0x03) {
@@ -172,6 +172,11 @@ static int of_bus_pci_match(struct device_node *np)
of_node_is_pcie(np, "pcie");
}

+static int of_bus_pci_ep_match(struct device_node *np)
+{
+ return of_node_is_type(np, "pci-ep") || of_node_is_pcie(np, "pcie-ep");
+}
+
static void of_bus_pci_count_cells(struct device_node *np,
int *addrc, int *sizec)
{
@@ -196,7 +201,7 @@ static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns,
return of_bus_default_map(addr, range, na, ns, pna, fna);
}

-#endif /* CONFIG_PCI */
+#endif /* CONFIG_PCI || CONFIG_PCI_ENDPOINT */

static int __of_address_resource_bounds(struct resource *r, u64 start, u64 size)
{
@@ -354,6 +359,19 @@ static struct of_bus of_busses[] = {
.get_flags = of_bus_pci_get_flags,
},
#endif /* CONFIG_PCI */
+#ifdef CONFIG_PCI_ENDPOINT
+ /* PCI Endpoint */
+ {
+ .name = "pci-ep",
+ .addresses = "assigned-addresses",
+ .match = of_bus_pci_ep_match,
+ .count_cells = of_bus_pci_count_cells,
+ .map = of_bus_pci_map,
+ .translate = of_bus_default_flags_translate,
+ .flag_cells = 1,
+ .get_flags = of_bus_pci_get_flags,
+ },
+#endif /* CONFIG_PCI_EP */
/* ISA */
{
.name = "isa",

--
2.34.1