linux-kernel - Re: [PATCHv3 19/27] PCI: mobiveil: disabled IB and OB windows set by bootloader

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Message-ID: <CAFZiPx1B7iTKgyr4uRJDescLx+NRLdOhjBdMyCoYA2Hja6Xy2g@mail.gmail.com>
Date:   Fri, 8 Feb 2019 18:12:12 +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 19/27] PCI: mobiveil: disabled IB and OB windows set by bootloader

On Tue, Jan 29, 2019 at 1:40 PM Z.q. Hou <zhiqiang.hou@....com> wrote:
>
> From: Hou Zhiqiang <Zhiqiang.Hou@....com>
>
> Disabled all inbound and outbound windows before set up the windows
> in kernel, in case transactions match the window set by bootloader.
>
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> Reviewed-by: Minghuan Lian <Minghuan.Lian@....com>
> ---
> V3:
>  - No change
>
>  .../controller/mobiveil/pcie-mobiveil-host.c   |  7 +++++++
>  .../pci/controller/mobiveil/pcie-mobiveil.c    | 18 ++++++++++++++++++
>  .../pci/controller/mobiveil/pcie-mobiveil.h    |  2 ++
>  3 files changed, 27 insertions(+)
>
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> index d1765d572f44..d028cdf31d0e 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> @@ -221,6 +221,13 @@ static int mobiveil_host_init(struct mobiveil_pcie *pcie)
>  {
>         u32 value, pab_ctrl, type;
>         struct resource_entry *win;
> +       int i;
> +
> +       /* Disable all inbound/outbound windows */
> +       for (i = 0; i < pcie->apio_wins; i++)
> +               mobiveil_pcie_disable_ob_win(pcie, i);
> +       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);
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.c b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
> index 370658d6546d..49d471b75925 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil.c
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
> @@ -226,3 +226,21 @@ int mobiveil_bringup_link(struct mobiveil_pcie *pcie)
>
>         return -ETIMEDOUT;
>  }
> +
> +void mobiveil_pcie_disable_ib_win(struct mobiveil_pcie *pci, int win_num)
> +{
> +       u32 val;
> +
> +       val = csr_readl(pci, PAB_PEX_AMAP_CTRL(win_num));
> +       val &= ~(1 << AMAP_CTRL_EN_SHIFT);
> +       csr_writel(pci, val, PAB_PEX_AMAP_CTRL(win_num));
> +}
> +
> +void mobiveil_pcie_disable_ob_win(struct mobiveil_pcie *pci, int win_num)
> +{
> +       u32 val;
> +
> +       val = csr_readl(pci, PAB_AXI_AMAP_CTRL(win_num));
> +       val &= ~(1 << WIN_ENABLE_SHIFT);
> +       csr_writel(pci, val, PAB_AXI_AMAP_CTRL(win_num));
> +}
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> index eb4cb61291a8..81685840b378 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> @@ -171,6 +171,8 @@ void program_ob_windows(struct mobiveil_pcie *pcie, int win_num, u64 cpu_addr,
>                         u64 pci_addr, u32 type, u64 size);
>  void program_ib_windows(struct mobiveil_pcie *pcie, int win_num, u64 cpu_addr,
>                         u64 pci_addr, u32 type, u64 size);
> +void mobiveil_pcie_disable_ob_win(struct mobiveil_pcie *pci, int win_num);
> +void mobiveil_pcie_disable_ib_win(struct mobiveil_pcie *pci, int win_num);
>  u32 csr_read(struct mobiveil_pcie *pcie, u32 off, size_t size);
>  void csr_write(struct mobiveil_pcie *pcie, u32 val, u32 off, size_t size);
>
> --
> 2.17.1
>
Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>