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Date: Mon, 26 Dec 2016 15:16:31 +0530
From: Alim Akhtar <alim.akhtar@...sung.com>
To: Jaehoon Chung <jh80.chung@...sung.com>,
Pankaj Dubey <pankaj.dubey@...sung.com>,
linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org
Cc: krzk@...nel.org, kgene@...nel.org, jingoohan1@...il.com,
bhelgaas@...gle.com, sanath@...sung.com,
Niyas Ahmed S T <niyas.ahmed@...sung.com>,
CPGS <cpgs@...sung.com>
Subject: Re: [PATCH] PCI: exynos: refactor exynos pcie driver
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@...sung.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.
> 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.
> 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@...sung.com>
>> Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.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 },
>> {},
>> };
>>
>>
>
>
>
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