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authorTomasz Nowicki <tn@semihalf.com>2016-06-02 10:41:03 +0200
committerGraeme Gregory <graeme.gregory@linaro.org>2016-06-07 14:09:29 +0100
commit9d05dcfdce8beff689fa12e8ccd71d27116bf1ec (patch)
tree3500f5f3575654049e9a00631ca1d11820df4ac2
parent2fbf4bda234e04a30957872c2c037438e5d3f9c0 (diff)
downloadleg-kernel-9d05dcfdce8beff689fa12e8ccd71d27116bf1ec.tar.gz
pci, pci-thunder-pem: Add ACPI support for ThunderX PEM.
This patch uses DECLARE_ACPI_MCFG_FIXUP to overwrite PCI config accessors. Also, it provides alternative way to find additional configuration region: thunder_pem_get_acpi_res is looking for host bridge's child (_HID "THRX0001") which contains mentioned configuration region description. See example below: Device (PEM0) { Name (_HID, EISAID ("PNP0A08")) Name (_CID, EISAID ("PNP0A03")) [...] Device (CFG0) { Name (_HID, "THRX0001") // PEM configuration space resources Name (_CRS, ResourceTemplate () { QWordMemory(ResourceConsumer, PosDecode, MinFixed, MaxFixed, NonCacheable, ReadWrite, 0, 0x87e0c5000000, 0x87E0C5FFFFFF, 0, 0x01000000) }) } } Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
-rw-r--r--drivers/pci/host/pci-thunder-pem.c132
1 files changed, 119 insertions, 13 deletions
diff --git a/drivers/pci/host/pci-thunder-pem.c b/drivers/pci/host/pci-thunder-pem.c
index 91f6fc68d374..8f002ef5ea2a 100644
--- a/drivers/pci/host/pci-thunder-pem.c
+++ b/drivers/pci/host/pci-thunder-pem.c
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
+#include <linux/pci-acpi.h>
#include <linux/pci-ecam.h>
#include <linux/platform_device.h>
@@ -284,6 +285,83 @@ static int thunder_pem_config_write(struct pci_bus *bus, unsigned int devfn,
return pci_generic_config_write(bus, devfn, where, size, val);
}
+#ifdef CONFIG_ACPI
+
+struct pem_acpi_res {
+ struct resource resource;
+ int found;
+};
+
+static acpi_status
+thunder_pem_cfg(struct acpi_resource *resource, void *ctx)
+{
+ struct pem_acpi_res *pem_ctx = ctx;
+ struct resource *res = &pem_ctx->resource;
+
+ if ((resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) ||
+ (resource->data.address32.resource_type != ACPI_MEMORY_RANGE))
+ return AE_OK;
+
+ res->start = resource->data.address64.address.minimum;
+ res->end = resource->data.address64.address.maximum;
+ res->flags = IORESOURCE_MEM;
+
+ pem_ctx->found++;
+ return AE_OK;
+}
+
+static acpi_status
+thunder_pem_find_dev(acpi_handle handle, u32 level, void *ctx, void **ret)
+{
+ struct pem_acpi_res *pem_ctx = ctx;
+ struct acpi_device_info *info;
+ acpi_status status = AE_OK;
+
+ status = acpi_get_object_info(handle, &info);
+ if (ACPI_FAILURE(status))
+ return AE_OK;
+
+ if (strncmp(info->hardware_id.string, "THRX0001", 8) != 0)
+ goto out;
+
+ pem_ctx->found = 0;
+ status = acpi_walk_resources(handle, METHOD_NAME__CRS, thunder_pem_cfg,
+ pem_ctx);
+ if (ACPI_FAILURE(status))
+ goto out;
+
+ if (pem_ctx->found)
+ status = AE_CTRL_TERMINATE;
+out:
+ kfree(info);
+ return status;
+}
+
+static struct resource *thunder_pem_get_acpi_res(struct device *dev)
+{
+ struct acpi_device *adev = to_acpi_device(dev);
+ acpi_handle handle = acpi_device_handle(adev);
+ struct pem_acpi_res *pem_ctx;
+ acpi_status status;
+
+ pem_ctx = devm_kzalloc(dev, sizeof(*pem_ctx), GFP_KERNEL);
+ if (!pem_ctx)
+ return NULL;
+
+ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
+ thunder_pem_find_dev, NULL, pem_ctx, NULL);
+ if (ACPI_FAILURE(status) || !pem_ctx->found)
+ return NULL;
+
+ return &pem_ctx->resource;
+}
+#else
+static struct resource *thunder_pem_get_acpi_res(struct device *dev)
+{
+ return NULL;
+}
+#endif
+
static int thunder_pem_init(struct pci_config_window *cfg)
{
struct device *dev = cfg->parent;
@@ -292,24 +370,24 @@ static int thunder_pem_init(struct pci_config_window *cfg)
struct thunder_pem_pci *pem_pci;
struct platform_device *pdev;
- /* Only OF support for now */
- if (!dev->of_node)
- return -EINVAL;
-
pem_pci = devm_kzalloc(dev, sizeof(*pem_pci), GFP_KERNEL);
if (!pem_pci)
return -ENOMEM;
- pdev = to_platform_device(dev);
-
- /*
- * The second register range is the PEM bridge to the PCIe
- * bus. It has a different config access method than those
- * devices behind the bridge.
- */
- res_pem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (acpi_disabled) {
+ pdev = to_platform_device(dev);
+
+ /*
+ * The second register range is the PEM bridge to the PCIe
+ * bus. It has a different config access method than those
+ * devices behind the bridge.
+ */
+ res_pem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ } else {
+ res_pem = thunder_pem_get_acpi_res(dev);
+ }
if (!res_pem) {
- dev_err(dev, "missing \"reg[1]\"property\n");
+ dev_err(dev, "missing configuration region\n");
return -EINVAL;
}
@@ -362,5 +440,33 @@ static struct platform_driver thunder_pem_driver = {
};
module_platform_driver(thunder_pem_driver);
+#ifdef CONFIG_ACPI
+
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 4, PCI_MCFG_BUS_ANY);
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 5, PCI_MCFG_BUS_ANY);
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 6, PCI_MCFG_BUS_ANY);
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 7, PCI_MCFG_BUS_ANY);
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 8, PCI_MCFG_BUS_ANY);
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 9, PCI_MCFG_BUS_ANY);
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 14, PCI_MCFG_BUS_ANY);
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 15, PCI_MCFG_BUS_ANY);
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 16, PCI_MCFG_BUS_ANY);
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 17, PCI_MCFG_BUS_ANY);
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 18, PCI_MCFG_BUS_ANY);
+DECLARE_ACPI_MCFG_FIXUP(&pci_thunder_pem_ops, "CAVIUM", 1,
+ 19, PCI_MCFG_BUS_ANY);
+#endif
+
MODULE_DESCRIPTION("Thunder PEM PCIe host driver");
MODULE_LICENSE("GPL v2");