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Message-ID: <CAFZiPx0SUBd_ad-P2yyOA_==PbXN58YamT1-kQVTuz27+8Q+bw@mail.gmail.com>
Date: Fri, 8 Feb 2019 18:16:11 +0530
From: Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>
To: "Z.q. Hou" <zhiqiang.hou@....com>
Cc: "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>,
"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>,
Mingkai Hu <mingkai.hu@....com>,
"M.h. Lian" <minghuan.lian@....com>,
Xiaowei Bao <xiaowei.bao@....com>
Subject: Re: [PATCHv3 21/27] PCI: mobiveil: make mobiveil_host_init can be
used to re-init host
On Tue, Jan 29, 2019 at 1:40 PM Z.q. Hou <zhiqiang.hou@....com> wrote:
>
> 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>
> ---
> V3:
> - Removed the duplicated free opteration of pcie->resources.
>
> .../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 d028cdf31d0e..e8d0c4989013 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> @@ -217,7 +217,7 @@ 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;
> @@ -229,11 +229,16 @@ 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
> @@ -279,7 +284,7 @@ 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) {
> @@ -550,8 +555,6 @@ 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);
> @@ -565,34 +568,35 @@ 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;
> @@ -608,7 +612,7 @@ 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;
>
> @@ -618,7 +622,4 @@ 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 933c2f34bc52..0f5303962e88 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> @@ -152,7 +152,7 @@ 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 */
> @@ -165,6 +165,7 @@ 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
>
Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>
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