thunder-pem driver stands for being ACPI based PCI host controller.
However, there is no standard way to describe its PEM-specific register
ranges in ACPI tables. Thus we add thunder_pem_init() ACPI extension
to obtain hardcoded addresses from static resource array.
Although it is not pretty, it prevents from creating standard mechanism to
handle similar cases in future.
Signed-off-by: Tomasz Nowicki <tn@xxxxxxxxxxxx>
---
drivers/pci/host/pci-thunder-pem.c | 61 ++++++++++++++++++++++++++++++--------
1 file changed, 48 insertions(+), 13 deletions(-)
diff --git a/drivers/pci/host/pci-thunder-pem.c b/drivers/pci/host/pci-thunder-pem.c
index 6abaf80..b048761 100644
--- a/drivers/pci/host/pci-thunder-pem.c
+++ b/drivers/pci/host/pci-thunder-pem.c
@@ -18,6 +18,7 @@
#include <linux/init.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 +285,40 @@ 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
+static struct resource thunder_pem_reg_res[] = {
+ [4] = DEFINE_RES_MEM(0x87e0c0000000UL, SZ_16M),
+ [5] = DEFINE_RES_MEM(0x87e0c1000000UL, SZ_16M),
+ [6] = DEFINE_RES_MEM(0x87e0c2000000UL, SZ_16M),
+ [7] = DEFINE_RES_MEM(0x87e0c3000000UL, SZ_16M),
+ [8] = DEFINE_RES_MEM(0x87e0c4000000UL, SZ_16M),
+ [9] = DEFINE_RES_MEM(0x87e0c5000000UL, SZ_16M),
+ [14] = DEFINE_RES_MEM(0x97e0c0000000UL, SZ_16M),
+ [15] = DEFINE_RES_MEM(0x97e0c1000000UL, SZ_16M),
+ [16] = DEFINE_RES_MEM(0x97e0c2000000UL, SZ_16M),
+ [17] = DEFINE_RES_MEM(0x97e0c3000000UL, SZ_16M),
+ [18] = DEFINE_RES_MEM(0x97e0c4000000UL, SZ_16M),
+ [19] = DEFINE_RES_MEM(0x97e0c5000000UL, SZ_16M),
+};
+
+static struct resource *thunder_pem_acpi_res(struct pci_config_window *cfg)
+{
+ struct acpi_device *adev = to_acpi_device(cfg->parent);
+ struct acpi_pci_root *root = acpi_driver_data(adev);
+
+ if ((root->segment >= 4 && root->segment <= 9) ||
+ (root->segment >= 14 && root->segment <= 19))
+ return &thunder_pem_reg_res[root->segment];
+
+ return NULL;
+}
+#else
+static struct resource *thunder_pem_acpi_res(struct pci_config_window *cfg)
+{
+ return NULL;
+}
+#endif
+
static int thunder_pem_init(struct pci_config_window *cfg)
{
struct device *dev = cfg->parent;
@@ -292,24 +327,24 @@ 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_acpi_res(cfg);
+ }
if (!res_pem) {
- dev_err(dev, "missing \"reg[1]\"property\n");
+ dev_err(dev, "missing configuration region\n");
return -EINVAL;
}
--
1.9.1
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