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Subject[PATCH] PCI/MSI: pci-xgene-msi: Enable MSI support in ACPI boot for X-Gene v1
Date
This patch makes pci-xgene-msi driver ACPI-aware and provides
MSI capability for X-Gene v1 PCIe controllers in ACPI boot mode.

Signed-off-by: Duc Dang <dhdang@apm.com>
---
drivers/pci/host/pci-xgene-msi.c | 35 ++++++++++++++++++++++++++++++++---
1 file changed, 32 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/host/pci-xgene-msi.c b/drivers/pci/host/pci-xgene-msi.c
index a6456b5..466aa93 100644
--- a/drivers/pci/host/pci-xgene-msi.c
+++ b/drivers/pci/host/pci-xgene-msi.c
@@ -24,6 +24,7 @@
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/of_pci.h>
+#include <linux/acpi.h>

#define MSI_IR0 0x000000
#define MSI_INT0 0x800000
@@ -39,7 +40,7 @@ struct xgene_msi_group {
};

struct xgene_msi {
- struct device_node *node;
+ struct fwnode_handle *fwnode;
struct irq_domain *inner_domain;
struct irq_domain *msi_domain;
u64 msi_addr;
@@ -249,6 +250,13 @@ static const struct irq_domain_ops msi_domain_ops = {
.free = xgene_irq_domain_free,
};

+#ifdef CONFIG_ACPI
+static struct fwnode_handle *xgene_msi_get_fwnode(struct device *dev)
+{
+ return xgene_msi_ctrl.fwnode;
+}
+#endif
+
static int xgene_allocate_domains(struct xgene_msi *msi)
{
msi->inner_domain = irq_domain_add_linear(NULL, NR_MSI_VEC,
@@ -256,7 +264,7 @@ static int xgene_allocate_domains(struct xgene_msi *msi)
if (!msi->inner_domain)
return -ENOMEM;

- msi->msi_domain = pci_msi_create_irq_domain(of_node_to_fwnode(msi->node),
+ msi->msi_domain = pci_msi_create_irq_domain(msi->fwnode,
&xgene_msi_domain_info,
msi->inner_domain);

@@ -265,6 +273,9 @@ static int xgene_allocate_domains(struct xgene_msi *msi)
return -ENOMEM;
}

+#ifdef CONFIG_ACPI
+ pci_msi_register_fwnode_provider(&xgene_msi_get_fwnode);
+#endif
return 0;
}

@@ -473,6 +484,13 @@ static const struct of_device_id xgene_msi_match_table[] = {
{},
};

+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xgene_msi_acpi_ids[] = {
+ {"APMC0D0E", 0},
+ { },
+};
+#endif
+
static int xgene_msi_probe(struct platform_device *pdev)
{
struct resource *res;
@@ -494,7 +512,17 @@ static int xgene_msi_probe(struct platform_device *pdev)
goto error;
}
xgene_msi->msi_addr = res->start;
- xgene_msi->node = pdev->dev.of_node;
+
+ xgene_msi->fwnode = of_node_to_fwnode(pdev->dev.of_node);
+ if (!xgene_msi->fwnode) {
+ xgene_msi->fwnode = irq_domain_alloc_fwnode(NULL);
+ if (!xgene_msi->fwnode) {
+ dev_err(&pdev->dev, "Failed to create fwnode\n");
+ rc = ENOMEM;
+ goto error;
+ }
+ }
+
xgene_msi->num_cpus = num_possible_cpus();

rc = xgene_msi_init_allocator(xgene_msi);
@@ -571,6 +599,7 @@ static struct platform_driver xgene_msi_driver = {
.driver = {
.name = "xgene-msi",
.of_match_table = xgene_msi_match_table,
+ .acpi_match_table = ACPI_PTR(xgene_msi_acpi_ids),
},
.probe = xgene_msi_probe,
.remove = xgene_msi_remove,
--
1.9.1
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