Subject: [PATCH] PCI: exynos: refactor exynos pcie driver

From: [email-masked] (Alim Akhtar)
Date: Tue, 27 Dec 2016 07:42:51 +0530

On 12/27/2016 06:39 AM, Jaehoon Chung wrote:
> Dear Alim,
>
> On 12/26/2016 06:46 PM, Alim Akhtar wrote:
>> Hello Jaehoon
>>
>> On 12/26/2016 02:32 PM, Jaehoon Chung wrote:
>>> Hi Pankaj,
>>>
>>> On 12/23/2016 07:56 PM, Pankaj Dubey wrote:
>>>> From: Niyas Ahmed S T <[email-masked]>
>>>>
>>>> Currently Exynos PCIe driver is only supported for Exynos5440 SoC.
>>>> This patch does refactoring of Exynos PCIe driver to extend support
>>>> for other Exynos SoC.
>>>>
>>>> Following are the main changes done via this patch:
>>>> 1) It adds separate structs for memory, clock resources.
>>>> 2) It add exynos_pcie_ops struct which will allow us to support the
>>>> differences in resources in different Exynos SoC.
>>>
>>> It's nice to me for reusing this file.
>>> but after considering too many times, i decided not to use this file.
>>>
>>> I'm not sure what block base is..actually this pci-exynos.c is really black-box.
>>> (No one maintains this file, even Samsung didn't care.)
>>> Who is using this?
>>> If Someone can share the information about exynos5440, i can refactor everything.
>>> Otherwise, there are two solution..
>>>
>>> One is "adding the new pci-exynos.c" likes pci-exynos5433.c
>>> Other is "refactor this file" under assuming the each register's usage.
>>>
>> Its alway good to reuse code as far as possible.
>> I am yet to see the details of 5440, but since people are now going to support more Exynos variants, in my opinion, instead of adding pci-exynos5433.c, you can rename current pci-exynos.c to something like pci-exynos5440.c (only in case its too much changes needed to support 5433/exynos7) and lets have a common pci-exynos.c where we can add exynos7/5433 and others SoCs, AFAIK at least exynos7 and 5433 has similar pci controller.
>
> Yes, It's always good to reuse. but as you know, current pci-exynos.c file is really specific for only exynos5440.
> I will try to check about combining.
>
>>> I want to use the PHY generic Framework for EXYNOS PCIe.
>>>
>> I don't think you have an option here, you should use generic PHY APIs, otherwise phy drive should go to drivers/misc.
>> Other thoughts are welcome.
>
> Why go to drivers/misc? There is driver/phy/ for PHY generic Framework.
> If i will touch this file, then i will put our phy-exynos-pcie file under driver/phy/ .
> I already sent the patch for this. Could you check them?
>
My point was, if you are not going to use generic PHY APIs, then phy 
driver should go into drivers/misc. Anyway as you said you have already 
posted patches with generic phy framework, I will take a look.
> http://patchwork.ozlabs.org/patch/708738/
> http://patchwork.ozlabs.org/patch/708742/
>
Thanks.

> Best Regards,
> Jaehoon Chung
>
>>
>>> If you or other guys really want to use the pci-exynos.c for other exynos,
>>> I will rework with PHY generic framework. Then i will resend the my patches as V2.
>>>
>>> One more thing..Does anyone know what the usage of block base is?
>>> Can i use that register as "syscon"?
>>>
>>> Best Regards,
>>> Jaehoon Chung
>>>
>>>>
>>>> No functional change intended.
>>>>
>>>> Signed-off-by: Niyas Ahmed S T <[email-masked]>
>>>> Signed-off-by: Pankaj Dubey <[email-masked]>
>>>> ---
>>>> This patch set is prepared on top of Krzysztof's for-next and
>>>> PCIe driver cleanup patch [1] by Jaehoon Chung.
>>>>
>>>> [1]: https://lkml.org/lkml/2016/12/19/44
>>>>
>>>>
>>>>    drivers/pci/host/pci-exynos.c | 346 ++++++++++++++++++++++++++----------------
>>>>    1 file changed, 217 insertions(+), 129 deletions(-)
>>>>
>>>> diff --git a/drivers/pci/host/pci-exynos.c b/drivers/pci/host/pci-exynos.c
>>>> index 33562cf..2dc54f7 100644
>>>> --- a/drivers/pci/host/pci-exynos.c
>>>> +++ b/drivers/pci/host/pci-exynos.c
>>>> @@ -17,6 +17,7 @@
>>>>    #include <linux/interrupt.h>
>>>>    #include <linux/kernel.h>
>>>>    #include <linux/init.h>
>>>> +#include <linux/of_device.h>
>>>>    #include <linux/of_gpio.h>
>>>>    #include <linux/pci.h>
>>>>    #include <linux/platform_device.h>
>>>> @@ -28,16 +29,6 @@
>>>>
>>>>    #define to_exynos_pcie(x)    container_of(x, struct exynos_pcie, pp)
>>>>
>>>> -struct exynos_pcie {
>>>> -    struct pcie_port    pp;
>>>> -    void __iomem        *elbi_base;    /* DT 0th resource */
>>>> -    void __iomem        *phy_base;    /* DT 1st resource */
>>>> -    void __iomem        *block_base;    /* DT 2nd resource */
>>>> -    int            reset_gpio;
>>>> -    struct clk        *clk;
>>>> -    struct clk        *bus_clk;
>>>> -};
>>>> -
>>>>    /* PCIe ELBI registers */
>>>>    #define PCIE_IRQ_PULSE            0x000
>>>>    #define IRQ_INTA_ASSERT            BIT(0)
>>>> @@ -102,6 +93,122 @@ struct exynos_pcie {
>>>>    #define PCIE_PHY_TRSV3_PD_TSV        BIT(7)
>>>>    #define PCIE_PHY_TRSV3_LVCC        0x31c
>>>>
>>>> +struct exynos_pcie_mem_res {
>>>> +    void __iomem *elbi_base; /* DT 0th resource: PCIE CTRL */
>>>> +    void __iomem *phy_base; /* DT 1st resource: PHY CTRL */
>>>> +    void __iomem *block_base; /* DT 2nd resource: PHY ADDITIONAL CTRL */
>>>> +};
>>>> +
>>>> +struct exynos_pcie_clk_res {
>>>> +    struct clk *clk;
>>>> +    struct clk *bus_clk;
>>>> +};
>>>> +
>>>> +struct exynos_pcie {
>>>> +    struct pcie_port        pp;
>>>> +    struct exynos_pcie_mem_res    *mem_res;
>>>> +    struct exynos_pcie_clk_res    *clk_res;
>>>> +    const struct exynos_pcie_ops    *ops;
>>>> +    int                reset_gpio;
>>>> +};
>>>> +
>>>> +struct exynos_pcie_ops {
>>>> +    int (*get_mem_resources)(struct platform_device *pdev,
>>>> +            struct exynos_pcie *ep);
>>>> +    int (*get_clk_resources)(struct exynos_pcie *ep);
>>>> +    int (*init_clk_resources)(struct exynos_pcie *ep);
>>>> +    void (*deinit_clk_resources)(struct exynos_pcie *ep);
>>>> +};
>>>> +
>>>> +static int exynos5440_pcie_get_mem_resources(struct platform_device *pdev,
>>>> +                        struct exynos_pcie *ep)
>>>> +{
>>>> +    struct resource *res;
>>>> +    struct device *dev = ep->pp.dev;
>>>> +
>>>> +    ep->mem_res = devm_kzalloc(dev, sizeof(*ep->mem_res), GFP_KERNEL);
>>>> +    if (!ep->mem_res)
>>>> +        return -ENOMEM;
>>>> +
>>>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>>> +    ep->mem_res->elbi_base = devm_ioremap_resource(dev, res);
>>>> +    if (IS_ERR(ep->mem_res->elbi_base))
>>>> +        return PTR_ERR(ep->mem_res->elbi_base);
>>>> +
>>>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>>>> +    ep->mem_res->phy_base = devm_ioremap_resource(dev, res);
>>>> +    if (IS_ERR(ep->mem_res->phy_base))
>>>> +        return PTR_ERR(ep->mem_res->phy_base);
>>>> +
>>>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
>>>> +    ep->mem_res->block_base = devm_ioremap_resource(dev, res);
>>>> +    if (IS_ERR(ep->mem_res->block_base))
>>>> +        return PTR_ERR(ep->mem_res->block_base);
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static int exynos5440_pcie_get_clk_resources(struct exynos_pcie *ep)
>>>> +{
>>>> +    struct device *dev = ep->pp.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;
>>>> +}
>>>> +
>>>> +static int exynos5440_pcie_init_clk_resources(struct exynos_pcie *ep)
>>>> +{
>>>> +    struct device *dev = ep->pp.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;
>>>> +}
>>>> +
>>>> +static void exynos5440_pcie_deinit_clk_resources(struct exynos_pcie *ep)
>>>> +{
>>>> +    clk_disable_unprepare(ep->clk_res->bus_clk);
>>>> +    clk_disable_unprepare(ep->clk_res->clk);
>>>> +}
>>>> +
>>>> +static const struct exynos_pcie_ops exynos5440_pcie_ops = {
>>>> +    .get_mem_resources    = exynos5440_pcie_get_mem_resources,
>>>> +    .get_clk_resources    = exynos5440_pcie_get_clk_resources,
>>>> +    .init_clk_resources    = exynos5440_pcie_init_clk_resources,
>>>> +    .deinit_clk_resources    = exynos5440_pcie_deinit_clk_resources,
>>>> +};
>>>> +
>>>>    static void exynos_pcie_writel(void __iomem *base, u32 val, u32 reg)
>>>>    {
>>>>        writel(val, base + reg);
>>>> @@ -116,155 +223,155 @@ static void exynos_pcie_sideband_dbi_w_mode(struct exynos_pcie *ep, bool on)
>>>>    {
>>>>        u32 val;
>>>>
>>>> -    val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_SLV_AWMISC);
>>>> +    val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_ELBI_SLV_AWMISC);
>>>>        if (on)
>>>>            val |= PCIE_ELBI_SLV_DBI_ENABLE;
>>>>        else
>>>>            val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
>>>> -    exynos_pcie_writel(ep->elbi_base, val, PCIE_ELBI_SLV_AWMISC);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_ELBI_SLV_AWMISC);
>>>>    }
>>>>
>>>>    static void exynos_pcie_sideband_dbi_r_mode(struct exynos_pcie *ep, bool on)
>>>>    {
>>>>        u32 val;
>>>>
>>>> -    val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_SLV_ARMISC);
>>>> +    val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_ELBI_SLV_ARMISC);
>>>>        if (on)
>>>>            val |= PCIE_ELBI_SLV_DBI_ENABLE;
>>>>        else
>>>>            val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
>>>> -    exynos_pcie_writel(ep->elbi_base, val, PCIE_ELBI_SLV_ARMISC);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_ELBI_SLV_ARMISC);
>>>>    }
>>>>
>>>>    static void exynos_pcie_assert_core_reset(struct exynos_pcie *ep)
>>>>    {
>>>>        u32 val;
>>>>
>>>> -    val = exynos_pcie_readl(ep->elbi_base, PCIE_CORE_RESET);
>>>> +    val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_CORE_RESET);
>>>>        val &= ~PCIE_CORE_RESET_ENABLE;
>>>> -    exynos_pcie_writel(ep->elbi_base, val, PCIE_CORE_RESET);
>>>> -    exynos_pcie_writel(ep->elbi_base, 0, PCIE_PWR_RESET);
>>>> -    exynos_pcie_writel(ep->elbi_base, 0, PCIE_STICKY_RESET);
>>>> -    exynos_pcie_writel(ep->elbi_base, 0, PCIE_NONSTICKY_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_CORE_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_PWR_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_STICKY_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_NONSTICKY_RESET);
>>>>    }
>>>>
>>>>    static void exynos_pcie_deassert_core_reset(struct exynos_pcie *ep)
>>>>    {
>>>>        u32 val;
>>>>
>>>> -    val = exynos_pcie_readl(ep->elbi_base, PCIE_CORE_RESET);
>>>> +    val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_CORE_RESET);
>>>>        val |= PCIE_CORE_RESET_ENABLE;
>>>>
>>>> -    exynos_pcie_writel(ep->elbi_base, val, PCIE_CORE_RESET);
>>>> -    exynos_pcie_writel(ep->elbi_base, 1, PCIE_STICKY_RESET);
>>>> -    exynos_pcie_writel(ep->elbi_base, 1, PCIE_NONSTICKY_RESET);
>>>> -    exynos_pcie_writel(ep->elbi_base, 1, PCIE_APP_INIT_RESET);
>>>> -    exynos_pcie_writel(ep->elbi_base, 0, PCIE_APP_INIT_RESET);
>>>> -    exynos_pcie_writel(ep->block_base, 1, PCIE_PHY_MAC_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_CORE_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_STICKY_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_NONSTICKY_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_APP_INIT_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_APP_INIT_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->block_base, 1, PCIE_PHY_MAC_RESET);
>>>>    }
>>>>
>>>>    static void exynos_pcie_assert_phy_reset(struct exynos_pcie *ep)
>>>>    {
>>>> -    exynos_pcie_writel(ep->block_base, 0, PCIE_PHY_MAC_RESET);
>>>> -    exynos_pcie_writel(ep->block_base, 1, PCIE_PHY_GLOBAL_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_MAC_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->block_base, 1, PCIE_PHY_GLOBAL_RESET);
>>>>    }
>>>>
>>>>    static void exynos_pcie_deassert_phy_reset(struct exynos_pcie *ep)
>>>>    {
>>>> -    exynos_pcie_writel(ep->block_base, 0, PCIE_PHY_GLOBAL_RESET);
>>>> -    exynos_pcie_writel(ep->elbi_base, 1, PCIE_PWR_RESET);
>>>> -    exynos_pcie_writel(ep->block_base, 0, PCIE_PHY_COMMON_RESET);
>>>> -    exynos_pcie_writel(ep->block_base, 0, PCIE_PHY_CMN_REG);
>>>> -    exynos_pcie_writel(ep->block_base, 0, PCIE_PHY_TRSVREG_RESET);
>>>> -    exynos_pcie_writel(ep->block_base, 0, PCIE_PHY_TRSV_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_GLOBAL_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_PWR_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_COMMON_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_CMN_REG);
>>>> +    exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_TRSVREG_RESET);
>>>> +    exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_TRSV_RESET);
>>>>    }
>>>>
>>>>    static void exynos_pcie_power_on_phy(struct exynos_pcie *ep)
>>>>    {
>>>>        u32 val;
>>>>
>>>> -    val = exynos_pcie_readl(ep->phy_base, PCIE_PHY_COMMON_POWER);
>>>> +    val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_COMMON_POWER);
>>>>        val &= ~PCIE_PHY_COMMON_PD_CMN;
>>>> -    exynos_pcie_writel(ep->phy_base, val, PCIE_PHY_COMMON_POWER);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_COMMON_POWER);
>>>>
>>>> -    val = exynos_pcie_readl(ep->phy_base, PCIE_PHY_TRSV0_POWER);
>>>> +    val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV0_POWER);
>>>>        val &= ~PCIE_PHY_TRSV0_PD_TSV;
>>>> -    exynos_pcie_writel(ep->phy_base, val, PCIE_PHY_TRSV0_POWER);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV0_POWER);
>>>>
>>>> -    val = exynos_pcie_readl(ep->phy_base, PCIE_PHY_TRSV1_POWER);
>>>> +    val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV1_POWER);
>>>>        val &= ~PCIE_PHY_TRSV1_PD_TSV;
>>>> -    exynos_pcie_writel(ep->phy_base, val, PCIE_PHY_TRSV1_POWER);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV1_POWER);
>>>>
>>>> -    val = exynos_pcie_readl(ep->phy_base, PCIE_PHY_TRSV2_POWER);
>>>> +    val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV2_POWER);
>>>>        val &= ~PCIE_PHY_TRSV2_PD_TSV;
>>>> -    exynos_pcie_writel(ep->phy_base, val, PCIE_PHY_TRSV2_POWER);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV2_POWER);
>>>>
>>>> -    val = exynos_pcie_readl(ep->phy_base, PCIE_PHY_TRSV3_POWER);
>>>> +    val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV3_POWER);
>>>>        val &= ~PCIE_PHY_TRSV3_PD_TSV;
>>>> -    exynos_pcie_writel(ep->phy_base, val, PCIE_PHY_TRSV3_POWER);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV3_POWER);
>>>>    }
>>>>
>>>>    static void exynos_pcie_power_off_phy(struct exynos_pcie *ep)
>>>>    {
>>>>        u32 val;
>>>>
>>>> -    val = exynos_pcie_readl(ep->phy_base, PCIE_PHY_COMMON_POWER);
>>>> +    val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_COMMON_POWER);
>>>>        val |= PCIE_PHY_COMMON_PD_CMN;
>>>> -    exynos_pcie_writel(ep->phy_base, val, PCIE_PHY_COMMON_POWER);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_COMMON_POWER);
>>>>
>>>> -    val = exynos_pcie_readl(ep->phy_base, PCIE_PHY_TRSV0_POWER);
>>>> +    val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV0_POWER);
>>>>        val |= PCIE_PHY_TRSV0_PD_TSV;
>>>> -    exynos_pcie_writel(ep->phy_base, val, PCIE_PHY_TRSV0_POWER);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV0_POWER);
>>>>
>>>> -    val = exynos_pcie_readl(ep->phy_base, PCIE_PHY_TRSV1_POWER);
>>>> +    val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV1_POWER);
>>>>        val |= PCIE_PHY_TRSV1_PD_TSV;
>>>> -    exynos_pcie_writel(ep->phy_base, val, PCIE_PHY_TRSV1_POWER);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV1_POWER);
>>>>
>>>> -    val = exynos_pcie_readl(ep->phy_base, PCIE_PHY_TRSV2_POWER);
>>>> +    val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV2_POWER);
>>>>        val |= PCIE_PHY_TRSV2_PD_TSV;
>>>> -    exynos_pcie_writel(ep->phy_base, val, PCIE_PHY_TRSV2_POWER);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV2_POWER);
>>>>
>>>> -    val = exynos_pcie_readl(ep->phy_base, PCIE_PHY_TRSV3_POWER);
>>>> +    val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV3_POWER);
>>>>        val |= PCIE_PHY_TRSV3_PD_TSV;
>>>> -    exynos_pcie_writel(ep->phy_base, val, PCIE_PHY_TRSV3_POWER);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV3_POWER);
>>>>    }
>>>>
>>>>    static void exynos_pcie_init_phy(struct exynos_pcie *ep)
>>>>    {
>>>>        /* DCC feedback control off */
>>>> -    exynos_pcie_writel(ep->phy_base, 0x29, PCIE_PHY_DCC_FEEDBACK);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x29, PCIE_PHY_DCC_FEEDBACK);
>>>>
>>>>        /* set TX/RX impedance */
>>>> -    exynos_pcie_writel(ep->phy_base, 0xd5, PCIE_PHY_IMPEDANCE);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0xd5, PCIE_PHY_IMPEDANCE);
>>>>
>>>>        /* set 50Mhz PHY clock */
>>>> -    exynos_pcie_writel(ep->phy_base, 0x14, PCIE_PHY_PLL_DIV_0);
>>>> -    exynos_pcie_writel(ep->phy_base, 0x12, PCIE_PHY_PLL_DIV_1);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x14, PCIE_PHY_PLL_DIV_0);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x12, PCIE_PHY_PLL_DIV_1);
>>>>
>>>>        /* set TX Differential output for lane 0 */
>>>> -    exynos_pcie_writel(ep->phy_base, 0x7f, PCIE_PHY_TRSV0_DRV_LVL);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x7f, PCIE_PHY_TRSV0_DRV_LVL);
>>>>
>>>>        /* set TX Pre-emphasis Level Control for lane 0 to minimum */
>>>> -    exynos_pcie_writel(ep->phy_base, 0x0, PCIE_PHY_TRSV0_EMP_LVL);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x0, PCIE_PHY_TRSV0_EMP_LVL);
>>>>
>>>>        /* set RX clock and data recovery bandwidth */
>>>> -    exynos_pcie_writel(ep->phy_base, 0xe7, PCIE_PHY_PLL_BIAS);
>>>> -    exynos_pcie_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV0_RXCDR);
>>>> -    exynos_pcie_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV1_RXCDR);
>>>> -    exynos_pcie_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV2_RXCDR);
>>>> -    exynos_pcie_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV3_RXCDR);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0xe7, PCIE_PHY_PLL_BIAS);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV0_RXCDR);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV1_RXCDR);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV2_RXCDR);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV3_RXCDR);
>>>>
>>>>        /* change TX Pre-emphasis Level Control for lanes */
>>>> -    exynos_pcie_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV0_EMP_LVL);
>>>> -    exynos_pcie_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV1_EMP_LVL);
>>>> -    exynos_pcie_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV2_EMP_LVL);
>>>> -    exynos_pcie_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV3_EMP_LVL);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV0_EMP_LVL);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV1_EMP_LVL);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV2_EMP_LVL);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV3_EMP_LVL);
>>>>
>>>>        /* set LVCC */
>>>> -    exynos_pcie_writel(ep->phy_base, 0x20, PCIE_PHY_TRSV0_LVCC);
>>>> -    exynos_pcie_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV1_LVCC);
>>>> -    exynos_pcie_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV2_LVCC);
>>>> -    exynos_pcie_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV3_LVCC);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0x20, PCIE_PHY_TRSV0_LVCC);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0xa0, PCIE_PHY_TRSV1_LVCC);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0xa0, PCIE_PHY_TRSV2_LVCC);
>>>> +    exynos_pcie_writel(ep->mem_res->phy_base, 0xa0, PCIE_PHY_TRSV3_LVCC);
>>>>    }
>>>>
>>>>    static void exynos_pcie_assert_reset(struct exynos_pcie *exynos_pcie)
>>>> @@ -295,25 +402,27 @@ static int exynos_pcie_establish_link(struct exynos_pcie *exynos_pcie)
>>>>        exynos_pcie_init_phy(exynos_pcie);
>>>>
>>>>        /* pulse for common reset */
>>>> -    exynos_pcie_writel(exynos_pcie->block_base, 1, PCIE_PHY_COMMON_RESET);
>>>> +    exynos_pcie_writel(exynos_pcie->mem_res->block_base, 1,
>>>> +                PCIE_PHY_COMMON_RESET);
>>>>        udelay(500);
>>>> -    exynos_pcie_writel(exynos_pcie->block_base, 0, PCIE_PHY_COMMON_RESET);
>>>> +    exynos_pcie_writel(exynos_pcie->mem_res->block_base, 0,
>>>> +                PCIE_PHY_COMMON_RESET);
>>>>
>>>>        exynos_pcie_deassert_core_reset(exynos_pcie);
>>>>        dw_pcie_setup_rc(pp);
>>>>        exynos_pcie_assert_reset(exynos_pcie);
>>>>
>>>>        /* assert LTSSM enable */
>>>> -    exynos_pcie_writel(exynos_pcie->elbi_base, PCIE_ELBI_LTSSM_ENABLE,
>>>> -              PCIE_APP_LTSSM_ENABLE);
>>>> +    exynos_pcie_writel(exynos_pcie->mem_res->elbi_base,
>>>> +            PCIE_ELBI_LTSSM_ENABLE, PCIE_APP_LTSSM_ENABLE);
>>>>
>>>>        /* check if the link is up or not */
>>>>        if (!dw_pcie_wait_for_link(pp))
>>>>            return 0;
>>>>
>>>> -    while (exynos_pcie_readl(exynos_pcie->phy_base,
>>>> +    while (exynos_pcie_readl(exynos_pcie->mem_res->phy_base,
>>>>                    PCIE_PHY_PLL_LOCKED) == 0) {
>>>> -        val = exynos_pcie_readl(exynos_pcie->block_base,
>>>> +        val = exynos_pcie_readl(exynos_pcie->mem_res->block_base,
>>>>                    PCIE_PHY_PLL_LOCKED);
>>>>            dev_info(dev, "PLL Locked: 0x%x\n", val);
>>>>        }
>>>> @@ -325,8 +434,8 @@ static void exynos_pcie_clear_irq_pulse(struct exynos_pcie *ep)
>>>>    {
>>>>        u32 val;
>>>>
>>>> -    val = exynos_pcie_readl(ep->elbi_base, PCIE_IRQ_PULSE);
>>>> -    exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_PULSE);
>>>> +    val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_IRQ_PULSE);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_PULSE);
>>>>    }
>>>>
>>>>    static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep)
>>>> @@ -336,7 +445,7 @@ static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep)
>>>>        /* enable INTX interrupt */
>>>>        val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
>>>>            IRQ_INTC_ASSERT | IRQ_INTD_ASSERT;
>>>> -    exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_EN_PULSE);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_EN_PULSE);
>>>>    }
>>>>
>>>>    static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
>>>> @@ -363,9 +472,9 @@ static void exynos_pcie_msi_init(struct exynos_pcie *ep)
>>>>        dw_pcie_msi_init(pp);
>>>>
>>>>        /* enable MSI interrupt */
>>>> -    val = exynos_pcie_readl(ep->elbi_base, PCIE_IRQ_EN_LEVEL);
>>>> +    val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_IRQ_EN_LEVEL);
>>>>        val |= IRQ_MSI_ENABLE;
>>>> -    exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_EN_LEVEL);
>>>> +    exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_EN_LEVEL);
>>>>    }
>>>>
>>>>    static void exynos_pcie_enable_interrupts(struct exynos_pcie *exynos_pcie)
>>>> @@ -425,7 +534,8 @@ static int exynos_pcie_link_up(struct pcie_port *pp)
>>>>        struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
>>>>        u32 val;
>>>>
>>>> -    val = exynos_pcie_readl(exynos_pcie->elbi_base, PCIE_ELBI_RDLH_LINKUP);
>>>> +    val = exynos_pcie_readl(exynos_pcie->mem_res->elbi_base,
>>>> +                    PCIE_ELBI_RDLH_LINKUP);
>>>>        if (val == PCIE_ELBI_LTSSM_ENABLE)
>>>>            return 1;
>>>>
>>>> @@ -503,7 +613,6 @@ static int __init exynos_pcie_probe(struct platform_device *pdev)
>>>>        struct exynos_pcie *exynos_pcie;
>>>>        struct pcie_port *pp;
>>>>        struct device_node *np = dev->of_node;
>>>> -    struct resource *res;
>>>>        int ret;
>>>>
>>>>        exynos_pcie = devm_kzalloc(dev, sizeof(*exynos_pcie), GFP_KERNEL);
>>>> @@ -513,59 +622,37 @@ static int __init exynos_pcie_probe(struct platform_device *pdev)
>>>>        pp = &exynos_pcie->pp;
>>>>        pp->dev = dev;
>>>>
>>>> -    exynos_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
>>>> -
>>>> -    exynos_pcie->clk = devm_clk_get(dev, "pcie");
>>>> -    if (IS_ERR(exynos_pcie->clk)) {
>>>> -        dev_err(dev, "Failed to get pcie rc clock\n");
>>>> -        return PTR_ERR(exynos_pcie->clk);
>>>> -    }
>>>> -    ret = clk_prepare_enable(exynos_pcie->clk);
>>>> -    if (ret)
>>>> -        return ret;
>>>> +    exynos_pcie->ops = (const struct exynos_pcie_ops *)
>>>> +                of_device_get_match_data(dev);
>>>>
>>>> -    exynos_pcie->bus_clk = devm_clk_get(dev, "pcie_bus");
>>>> -    if (IS_ERR(exynos_pcie->bus_clk)) {
>>>> -        dev_err(dev, "Failed to get pcie bus clock\n");
>>>> -        ret = PTR_ERR(exynos_pcie->bus_clk);
>>>> -        goto fail_clk;
>>>> -    }
>>>> -    ret = clk_prepare_enable(exynos_pcie->bus_clk);
>>>> -    if (ret)
>>>> -        goto fail_clk;
>>>> +    exynos_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
>>>>
>>>> -    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>>> -    exynos_pcie->elbi_base = devm_ioremap_resource(dev, res);
>>>> -    if (IS_ERR(exynos_pcie->elbi_base)) {
>>>> -        ret = PTR_ERR(exynos_pcie->elbi_base);
>>>> -        goto fail_bus_clk;
>>>> +    if (exynos_pcie->ops && exynos_pcie->ops->get_mem_resources) {
>>>> +        ret = exynos_pcie->ops->get_mem_resources(pdev, exynos_pcie);
>>>> +        if (ret)
>>>> +            return ret;
>>>>        }
>>>>
>>>> -    res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>>>> -    exynos_pcie->phy_base = devm_ioremap_resource(dev, res);
>>>> -    if (IS_ERR(exynos_pcie->phy_base)) {
>>>> -        ret = PTR_ERR(exynos_pcie->phy_base);
>>>> -        goto fail_bus_clk;
>>>> -    }
>>>> +    if (exynos_pcie->ops && exynos_pcie->ops->get_clk_resources) {
>>>> +        ret = exynos_pcie->ops->get_clk_resources(exynos_pcie);
>>>> +        if (ret)
>>>> +            return ret;
>>>>
>>>> -    res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
>>>> -    exynos_pcie->block_base = devm_ioremap_resource(dev, res);
>>>> -    if (IS_ERR(exynos_pcie->block_base)) {
>>>> -        ret = PTR_ERR(exynos_pcie->block_base);
>>>> -        goto fail_bus_clk;
>>>> +        ret = exynos_pcie->ops->init_clk_resources(exynos_pcie);
>>>> +        if (ret)
>>>> +            return ret;
>>>>        }
>>>>
>>>>        ret = exynos_add_pcie_port(exynos_pcie, pdev);
>>>>        if (ret < 0)
>>>> -        goto fail_bus_clk;
>>>> +        goto fail_probe;
>>>>
>>>>        platform_set_drvdata(pdev, exynos_pcie);
>>>>        return 0;
>>>>
>>>> -fail_bus_clk:
>>>> -    clk_disable_unprepare(exynos_pcie->bus_clk);
>>>> -fail_clk:
>>>> -    clk_disable_unprepare(exynos_pcie->clk);
>>>> +fail_probe:
>>>> +    if (exynos_pcie->ops && exynos_pcie->ops->deinit_clk_resources)
>>>> +        exynos_pcie->ops->deinit_clk_resources(exynos_pcie);
>>>>        return ret;
>>>>    }
>>>>
>>>> @@ -573,14 +660,15 @@ static int __exit exynos_pcie_remove(struct platform_device *pdev)
>>>>    {
>>>>        struct exynos_pcie *exynos_pcie = platform_get_drvdata(pdev);
>>>>
>>>> -    clk_disable_unprepare(exynos_pcie->bus_clk);
>>>> -    clk_disable_unprepare(exynos_pcie->clk);
>>>> +    if (exynos_pcie->ops && exynos_pcie->ops->deinit_clk_resources)
>>>> +        exynos_pcie->ops->deinit_clk_resources(exynos_pcie);
>>>>
>>>>        return 0;
>>>>    }
>>>>
>>>>    static const struct of_device_id exynos_pcie_of_match[] = {
>>>> -    { .compatible = "samsung,exynos5440-pcie", },
>>>> +    {    .compatible = "samsung,exynos5440-pcie",
>>>> +        .data = &exynos5440_pcie_ops },
>>>>        {},
>>>>    };
>>>>
>>>>
>>>
>>>
>>>
>>
>>
>
>
>