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authorKrzysztof Wilczyński <kw@linux.com>2020-11-30 02:07:40 +0300
committerBjorn Helgaas <bhelgaas@google.com>2020-12-10 23:55:55 +0300
commit31a8cdb7ef8042a63fcb2ae3856df28af15abc8f (patch)
tree01bfc7b8d1173555721cd13ec9803c10c9e88232 /drivers/pci
parente7708f5b10e205d6291bb495e645a03553b9768b (diff)
downloadlinux-31a8cdb7ef8042a63fcb2ae3856df28af15abc8f.tar.xz
PCI: thunder-pem: Add constant for custom ".bus_shift" initialiser
Add a custom constant for the ".bus_shift" initialiser to capture a non-standard platform-specific ECAM bus shift value. Standard values otherwise defined in the PCI Express Specification are available in the include/linux/pci-ecam.h. Suggested-by: Bjorn Helgaas <bhelgaas@google.com> Link: https://lore.kernel.org/r/20201129230743.3006978-3-kw@linux.com Signed-off-by: Krzysztof Wilczyński <kw@linux.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/controller/pci-thunder-pem.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/pci/controller/pci-thunder-pem.c b/drivers/pci/controller/pci-thunder-pem.c
index 3f847969143e..1a3f70ac61fc 100644
--- a/drivers/pci/controller/pci-thunder-pem.c
+++ b/drivers/pci/controller/pci-thunder-pem.c
@@ -19,6 +19,15 @@
#define PEM_CFG_WR 0x28
#define PEM_CFG_RD 0x30
+/*
+ * Enhanced Configuration Access Mechanism (ECAM)
+ *
+ * N.B. This is a non-standard platform-specific ECAM bus shift value. For
+ * standard values defined in the PCI Express Base Specification see
+ * include/linux/pci-ecam.h.
+ */
+#define THUNDER_PCIE_ECAM_BUS_SHIFT 24
+
struct thunder_pem_pci {
u32 ea_entry[3];
void __iomem *pem_reg_base;
@@ -404,7 +413,7 @@ static int thunder_pem_acpi_init(struct pci_config_window *cfg)
}
const struct pci_ecam_ops thunder_pem_ecam_ops = {
- .bus_shift = 24,
+ .bus_shift = THUNDER_PCIE_ECAM_BUS_SHIFT,
.init = thunder_pem_acpi_init,
.pci_ops = {
.map_bus = pci_ecam_map_bus,
@@ -441,7 +450,7 @@ static int thunder_pem_platform_init(struct pci_config_window *cfg)
}
static const struct pci_ecam_ops pci_thunder_pem_ops = {
- .bus_shift = 24,
+ .bus_shift = THUNDER_PCIE_ECAM_BUS_SHIFT,
.init = thunder_pem_platform_init,
.pci_ops = {
.map_bus = pci_ecam_map_bus,