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Subject[PATCH V9 1/3] PCI: dwc: Add API support to de-initialize host
Date
Add an API to group all the tasks to be done to de-initialize host which
can then be called by any DesignWare core based driver implementations
while adding .remove() support in their respective drivers.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
Changes from v8:
* None

Changes from v7:
* None

Changes from v6:
* None

Changes from v5:
* None

Changes from v4:
* None

Changes from v3:
* Added check if (pci_msi_enabled() && !pp->ops->msi_host_init) before calling
dw_pcie_free_msi() API to mimic init path

Changes from v2:
* Rebased on top of linux-next top of the tree branch

Changes from v1:
* s/Designware/DesignWare

drivers/pci/controller/dwc/pcie-designware-host.c | 8 ++++++++
drivers/pci/controller/dwc/pcie-designware.h | 5 +++++
2 files changed, 13 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 77db32529319..d069e4290180 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -496,6 +496,14 @@ int dw_pcie_host_init(struct pcie_port *pp)
return ret;
}

+void dw_pcie_host_deinit(struct pcie_port *pp)
+{
+ pci_stop_root_bus(pp->root_bus);
+ pci_remove_root_bus(pp->root_bus);
+ if (pci_msi_enabled() && !pp->ops->msi_host_init)
+ dw_pcie_free_msi(pp);
+}
+
static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus,
u32 devfn, int where, int size, u32 *val,
bool write)
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index b8993f2b78df..14762e262758 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -351,6 +351,7 @@ void dw_pcie_msi_init(struct pcie_port *pp);
void dw_pcie_free_msi(struct pcie_port *pp);
void dw_pcie_setup_rc(struct pcie_port *pp);
int dw_pcie_host_init(struct pcie_port *pp);
+void dw_pcie_host_deinit(struct pcie_port *pp);
int dw_pcie_allocate_domains(struct pcie_port *pp);
#else
static inline irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
@@ -375,6 +376,10 @@ static inline int dw_pcie_host_init(struct pcie_port *pp)
return 0;
}

+static inline void dw_pcie_host_deinit(struct pcie_port *pp)
+{
+}
+
static inline int dw_pcie_allocate_domains(struct pcie_port *pp)
{
return 0;
--
2.17.1
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