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PCI: thunder-pem: Add constant for custom ".bus_shift" initialiser

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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>
This commit is contained in:
Krzysztof Wilczyński 2020-11-29 23:07:40 +00:00 committed by Bjorn Helgaas
parent e7708f5b10
commit 31a8cdb7ef
1 changed files with 11 additions and 2 deletions
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13
drivers/pci/controller/pci-thunder-pem.c
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@ -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,