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From:   Vidya Sagar <vidyas@nvidia.com>
To:     <jingoohan1@gmail.com>, <gustavo.pimentel@synopsys.com>,
        <lorenzo.pieralisi@arm.com>, <bhelgaas@google.com>,
        <Jisheng.Zhang@synaptics.com>, <thierry.reding@gmail.com>
CC:     <linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <kthota@nvidia.com>, <mmaddireddy@nvidia.com>,
        <sagar.tv@gmail.com>, <vidyas@nvidia.com>
Subject: [PATCH 1/2] PCI: dwc: Add API support to de-initialize host
Date:   Thu, 4 Apr 2019 17:50:23 +0530
Message-ID: <1554380425-29215-2-git-send-email-vidyas@nvidia.com>
In-Reply-To: <1554380425-29215-1-git-send-email-vidyas@nvidia.com>
References: <1554380425-29215-1-git-send-email-vidyas@nvidia.com>
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Sender: linux-kernel-owner@vger.kernel.org
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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>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 7 +++++++
 drivers/pci/controller/dwc/pcie-designware.h      | 5 +++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 3e4169e738a5..d7881490282d 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -516,6 +516,13 @@ 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);
+	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 adff0c713665..ea8d1caf11c5 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -343,6 +343,7 @@ 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)
@@ -367,6 +368,10 @@ 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;
-- 
2.7.4