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Date:   Fri, 12 Apr 2019 09:52:36 +0000
From:   "Z.q. Hou" <zhiqiang.hou@....com>
To:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "l.subrahmanya@...iveil.co.in" <l.subrahmanya@...iveil.co.in>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Leo Li <leoyang.li@....com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>
CC:     Mingkai Hu <mingkai.hu@....com>,
        "M.h. Lian" <minghuan.lian@....com>,
        Xiaowei Bao <xiaowei.bao@....com>,
        "Z.q. Hou" <zhiqiang.hou@....com>
Subject: [PATCHv5 2/6] PCI: mobiveil: Make mobiveil_host_init() can be used to
 re-init host

From: Hou Zhiqiang <Zhiqiang.Hou@....com>

Make the mobiveil_host_init() function can be used to re-init
host controller's PAB and GPEX CSR register block, as NXP
integrated Mobiveil IP has to reset and then re-init the PAB
and GPEX CSR registers upon hot-reset.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>
---
V5:
 - Corrected the subject.

 .../controller/mobiveil/pcie-mobiveil-host.c  | 41 ++++++++++---------
 .../pci/controller/mobiveil/pcie-mobiveil.h   |  3 +-
 2 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
index eba90b6b91b4..6ce49648909a 100644
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
@@ -219,7 +219,7 @@ static void mobiveil_pcie_enable_msi(struct mobiveil_pcie *pcie)
 	writel_relaxed(1, pcie->apb_csr_base + MSI_ENABLE_OFFSET);
 }
 
-static int mobiveil_host_init(struct mobiveil_pcie *pcie)
+int mobiveil_host_init(struct mobiveil_pcie *pcie, bool reinit)
 {
 	u32 value, pab_ctrl, type;
 	struct resource_entry *win;
@@ -231,11 +231,16 @@ static int mobiveil_host_init(struct mobiveil_pcie *pcie)
 	for (i = 0; i < pcie->ppio_wins; i++)
 		mobiveil_pcie_disable_ib_win(pcie, i);
 
-	/* setup bus numbers */
-	value = csr_readl(pcie, PCI_PRIMARY_BUS);
-	value &= 0xff000000;
-	value |= 0x00ff0100;
-	csr_writel(pcie, value, PCI_PRIMARY_BUS);
+	pcie->ib_wins_configured = 0;
+	pcie->ob_wins_configured = 0;
+
+	if (!reinit) {
+		/* setup bus numbers */
+		value = csr_readl(pcie, PCI_PRIMARY_BUS);
+		value &= 0xff000000;
+		value |= 0x00ff0100;
+		csr_writel(pcie, value, PCI_PRIMARY_BUS);
+	}
 
 	/*
 	 * program Bus Master Enable Bit in Command Register in PAB Config
@@ -281,7 +286,7 @@ static int mobiveil_host_init(struct mobiveil_pcie *pcie)
 	program_ib_windows(pcie, WIN_NUM_0, 0, 0, MEM_WINDOW_TYPE, IB_WIN_SIZE);
 
 	/* Get the I/O and memory ranges from DT */
-	resource_list_for_each_entry(win, &pcie->resources) {
+	resource_list_for_each_entry(win, pcie->resources) {
 		if (resource_type(win->res) == IORESOURCE_MEM) {
 			type = MEM_WINDOW_TYPE;
 		} else if (resource_type(win->res) == IORESOURCE_IO) {
@@ -552,8 +557,6 @@ int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie)
 	resource_size_t iobase;
 	int ret;
 
-	INIT_LIST_HEAD(&pcie->resources);
-
 	ret = mobiveil_pcie_parse_dt(pcie);
 	if (ret) {
 		dev_err(dev, "Parsing DT failed, ret: %x\n", ret);
@@ -567,34 +570,35 @@ int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie)
 
 	/* parse the host bridge base addresses from the device tree file */
 	ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,
-						    &pcie->resources, &iobase);
+						    &bridge->windows, &iobase);
 	if (ret) {
 		dev_err(dev, "Getting bridge resources failed\n");
 		return ret;
 	}
 
+	pcie->resources = &bridge->windows;
+
 	/*
 	 * configure all inbound and outbound windows and prepare the RC for
 	 * config access
 	 */
-	ret = mobiveil_host_init(pcie);
+	ret = mobiveil_host_init(pcie, false);
 	if (ret) {
 		dev_err(dev, "Failed to initialize host\n");
-		goto error;
+		return ret;
 	}
 
 	ret = mobiveil_pcie_interrupt_init(pcie);
 	if (ret) {
 		dev_err(dev, "Interrupt init failed\n");
-		goto error;
+		return ret;
 	}
 
-	ret = devm_request_pci_bus_resources(dev, &pcie->resources);
+	ret = devm_request_pci_bus_resources(dev, pcie->resources);
 	if (ret)
-		goto error;
+		return ret;
 
 	/* Initialize bridge */
-	list_splice_init(&pcie->resources, &bridge->windows);
 	bridge->dev.parent = dev;
 	bridge->sysdata = pcie;
 	bridge->busnr = pcie->rp.root_bus_nr;
@@ -609,7 +613,7 @@ int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie)
 	/* setup the kernel resources for the newly added PCIe root bus */
 	ret = pci_scan_root_bus_bridge(bridge);
 	if (ret)
-		goto error;
+		return ret;
 
 	bus = bridge->bus;
 
@@ -619,7 +623,4 @@ int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie)
 	pci_bus_add_devices(bus);
 
 	return 0;
-error:
-	pci_free_resource_list(&pcie->resources);
-	return ret;
 }
diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
index 44d6c4e30c09..5eecb2fc039d 100644
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
@@ -154,7 +154,7 @@ struct mobiveil_pab_ops {
 
 struct mobiveil_pcie {
 	struct platform_device *pdev;
-	struct list_head resources;
+	struct list_head *resources;
 	void __iomem *csr_axi_slave_base;	/* PAB registers base */
 	phys_addr_t pcie_reg_base;	/* Physical PCIe Controller Base */
 	void __iomem *apb_csr_base;	/* MSI register base */
@@ -167,6 +167,7 @@ struct mobiveil_pcie {
 };
 
 int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie);
+int mobiveil_host_init(struct mobiveil_pcie *pcie, bool reinit);
 bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie);
 int mobiveil_bringup_link(struct mobiveil_pcie *pcie);
 void program_ob_windows(struct mobiveil_pcie *pcie, int win_num, u64 cpu_addr,
-- 
2.17.1

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