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Date: Wed, 27 Dec 2017 14:58:08 +0900
From: Jaehoon Chung <jh80.chung@...sung.com>
To: Rob Herring <robh@...nel.org>
Cc: linux-pci@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
krzk@...nel.org, jingoohan1@...il.com, kgene@...nel.org,
lorenzo.pieralisi@....com
Subject: Re: [RFC 2/2] pci: dwc: pci-exynos: add the codes to support the
exynos5433
On 12/27/2017 06:11 AM, Rob Herring wrote:
> On Thu, Dec 21, 2017 at 09:14:07PM +0900, Jaehoon Chung wrote:
>> Exynos5433 has the PCIe for WiFi.
>> Added the codes relevant to PCIe for supporting the exynos5433.
>> Also changed the binding documentation name to
>> 'samsung,exynos-pcie.txt'.
>> (It's not only exynos5440 anymore.)
>>
>> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
>> ---
>> ...exynos5440-pcie.txt => samsung,exynos-pcie.txt} | 2 +-
>> drivers/pci/dwc/pci-exynos.c | 183 ++++++++++++++++-----
>> 2 files changed, 144 insertions(+), 41 deletions(-)
>> rename Documentation/devicetree/bindings/pci/{samsung,exynos5440-pcie.txt => samsung,exynos-pcie.txt} (97%)
>>
>> diff --git a/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.txt
>> similarity index 97%
>> rename from Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
>> rename to Documentation/devicetree/bindings/pci/samsung,exynos-pcie.txt
>> index 34a11bfbfb60..958dcc150505 100644
>> --- a/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
>> +++ b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.txt
>> @@ -4,7 +4,7 @@ This PCIe host controller is based on the Synopsys DesignWare PCIe IP
>> and thus inherits all the common properties defined in designware-pcie.txt.
>>
>> Required properties:
>> -- compatible: "samsung,exynos5440-pcie"
>> +- compatible: "samsung,exynos5440-pcie" or "samsung,exynos5433-pcie"
>
> Quite a lot of driver changes for just a new compatible.
It needs to distinguish between exynos5440 and other exynos variants.
So needs to add the new common compatible likes "samsung,exynos5-pcie" or "samsung,exynos-pcie".
Actually, i hope that exynos5440 can be removed from mainline kernel.
>
>> - reg: base addresses and lengths of the PCIe controller,
>
> For example, you're adding the DBI registers which is not documented
> here.
>
> Perhaps it is time to remove the old phy support before adding a new
> platform.
Ok, I will send the patches to remove the old phy.
>
>> the PHY controller, additional register for the PHY controller.
>> (Registers for the PHY controller are DEPRECATED.
>> diff --git a/drivers/pci/dwc/pci-exynos.c b/drivers/pci/dwc/pci-exynos.c
>> index 5596fdedbb94..8dee2e90347e 100644
>> --- a/drivers/pci/dwc/pci-exynos.c
>> +++ b/drivers/pci/dwc/pci-exynos.c
>> @@ -40,6 +40,8 @@
>> #define PCIE_IRQ_SPECIAL 0x008
>> #define PCIE_IRQ_EN_PULSE 0x00c
>> #define PCIE_IRQ_EN_LEVEL 0x010
>> +#define PCIE_SW_WAKE 0x018
>> +#define PCIE_BUS_EN BIT(1)
>> #define IRQ_MSI_ENABLE BIT(2)
>> #define PCIE_IRQ_EN_SPECIAL 0x014
>> #define PCIE_PWR_RESET 0x018
>> @@ -49,7 +51,8 @@
>> #define PCIE_NONSTICKY_RESET 0x024
>> #define PCIE_APP_INIT_RESET 0x028
>> #define PCIE_APP_LTSSM_ENABLE 0x02c
>> -#define PCIE_ELBI_RDLH_LINKUP 0x064
>> +#define PCIE_ELBI_RDLH_LINKUP 0x074
>> +#define PCIE_ELBI_XMLH_LINKUP BIT(4)
>> #define PCIE_ELBI_LTSSM_ENABLE 0x1
>> #define PCIE_ELBI_SLV_AWMISC 0x11c
>> #define PCIE_ELBI_SLV_ARMISC 0x120
>> @@ -94,6 +97,10 @@
>> #define PCIE_PHY_TRSV3_PD_TSV BIT(7)
>> #define PCIE_PHY_TRSV3_LVCC 0x31c
>>
>> +/* DBI register */
>> +#define PCIE_MISC_CONTROL_1_OFF 0x8BC
>> +#define DBI_RO_WR_EN BIT(0)
>> +
>> struct exynos_pcie_mem_res {
>> void __iomem *elbi_base; /* DT 0th resource: PCIe CTRL */
>> void __iomem *phy_base; /* DT 1st resource: PHY CTRL */
>> @@ -221,6 +228,96 @@ static const struct exynos_pcie_ops exynos5440_pcie_ops = {
>> .deinit_clk_resources = exynos5440_pcie_deinit_clk_resources,
>> };
>>
>> +static int exynos5433_pcie_get_mem_resources(struct platform_device *pdev,
>> + struct exynos_pcie *ep)
>> +{
>> + struct dw_pcie *pci = ep->pci;
>> + struct device *dev = pci->dev;
>> + struct resource *res;
>> +
>> + ep->mem_res = devm_kzalloc(dev, sizeof(*ep->mem_res), GFP_KERNEL);
>> + if (!ep->mem_res)
>> + return -ENOMEM;
>> +
>> + /* External Local Bus interface(ELBI) Register */
>
> These are standard DW registers IIRC. So the DW core should handle this.
>
>> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");
>> + ep->mem_res->elbi_base = devm_ioremap_resource(&pdev->dev, res);
>> + if (IS_ERR(ep->mem_res->elbi_base))
>> + return PTR_ERR(ep->mem_res->elbi_base);
>> +
>> + /* Data Bus Interface(DBI) Register */
>> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
>> + pci->dbi_base = devm_ioremap_resource(&pdev->dev, res);
>
> This is handled by the DW plat driver. Perhaps the DW core should handle
> it too.
Will fix.
>
> Does the 5440 really not have DBI registers or you just happen to not
> need to access them?
I didn't have exynso5440 TRM, do you means exynos5433? It doesn't have its own DBI register.
>
>> + if (IS_ERR(pci->dbi_base))
>> + return PTR_ERR(pci->dbi_base);
>> +
>> + return 0;
>> +}
>> +
>> +static int exynos5433_pcie_get_clk_resources(struct exynos_pcie *ep)
>> +{
>> + struct dw_pcie *pci = ep->pci;
>> + struct device *dev = pci->dev;
>> +
>> + ep->clk_res = devm_kzalloc(dev, sizeof(*ep->clk_res), GFP_KERNEL);
>> + if (!ep->clk_res)
>> + return -ENOMEM;
>> +
>> + ep->clk_res->clk = devm_clk_get(dev, "pcie");
>> + if (IS_ERR(ep->clk_res->clk)) {
>> + dev_err(dev, "Failed to get pcie rc clock\n");
>> + return PTR_ERR(ep->clk_res->clk);
>> + }
>> +
>> + ep->clk_res->bus_clk = devm_clk_get(dev, "pcie_bus");
>> + if (IS_ERR(ep->clk_res->bus_clk)) {
>> + dev_err(dev, "Failed to get pcie bus clock\n");
>> + return PTR_ERR(ep->clk_res->bus_clk);
>> + }
>> +
>> + return 0;
>> +}
>
> Can't you reuse exynos5440_pcie_get_clk_resources? They appear to be the
> same.
Will reuse.
>
>> +
>> +static void exynos5433_pcie_deinit_clk_resources(struct exynos_pcie *ep)
>> +{
>> + clk_disable_unprepare(ep->clk_res->bus_clk);
>> + clk_disable_unprepare(ep->clk_res->clk);
>> +}
>> +
>> +
>> +static int exynos5433_pcie_init_clk_resources(struct exynos_pcie *ep)
>> +{
>> + struct dw_pcie *pci = ep->pci;
>> + struct device *dev = pci->dev;
>> + int ret;
>> +
>> + ret = clk_prepare_enable(ep->clk_res->clk);
>> + if (ret) {
>> + dev_err(dev, "cannot enable pcie rc clock");
>> + return ret;
>> + }
>> +
>> + ret = clk_prepare_enable(ep->clk_res->bus_clk);
>> + if (ret) {
>> + dev_err(dev, "cannot enable pcie bus clock");
>> + goto err_bus_clk;
>> + }
>> +
>> + return 0;
>> +
>> +err_bus_clk:
>> + clk_disable_unprepare(ep->clk_res->clk);
>> +
>> + return ret;
>> +}
>
> Ditto.
Ok. Will fix.
Best Regards,
Jaehoon Chung
>
> Rob
>
>
>
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