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

Jaehoon Chung
2016-12-27T01:09:12Z

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 <niyas.ahmed@samsung.com>
>>>
>>> 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?

http://patchwork.ozlabs.org/patch/708738/
http://patchwork.ozlabs.org/patch/708742/

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 <niyas.ahmed@samsung.com>
>>> Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
>>> ---
>>> 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 },
>>> {},
>>> };
>>>
>>>
>>
>>
>>
>
>