Re: [RFC 2/2] pci: dwc: pci-exynos: add the codes to support the exynos5433

From: Jaehoon Chung
Date: Thu Dec 21 2017 - 17:21:18 EST

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Hi Jingoo,

On 12/22/2017 01:12 AM, Jingoo Han wrote:
> On Thursday, December 21, 2017 7:14 AM, 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.)
>>
>
> I have no objection.
> However, I added some comments about Exynos5440.
>
>> Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
>> ---
>> ...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"
>> - reg: base addresses and lengths of the PCIe controller,
>> 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
>
> The address of this register should be 0x064 for exynos5440.
> Howe about the following?
>
> +#define EXYNOS5440_PCIE_ELBI_RDLH_LINKUP 0x064
> +#define PCIE_ELBI_RDLH_LINKUP 0x074
>
> Or you can add the following.
>
> /* Exynos5440 PCIe ELBI registers */
> #define EXYNOS5440_PCIE_ELBI_RDLH_LINKUP 0x064

Maybe, you're right. Because i didn't have Exynos5440 TRM, it's problem to me about updating other SoCs.
I have checked almost all variants Exynos. They are using the LINKUP register as 0x74.

If i can get the exynos5440 TRM, it's much helpful to me. Is it possible?

>
>> +#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 */
>> + 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);
>> + 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;
>> +}
>> +
>> +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;
>> +}
>> +
>> +static const struct exynos_pcie_ops exynos5433_pcie_ops = {
>> + .get_mem_resources = exynos5433_pcie_get_mem_resources,
>> + .get_clk_resources = exynos5433_pcie_get_clk_resources,
>> + .init_clk_resources = exynos5433_pcie_init_clk_resources,
>> + .deinit_clk_resources = exynos5433_pcie_deinit_clk_resources,
>> +};
>> +
>> static void exynos_pcie_writel(void __iomem *base, u32 val, u32 reg)
>> {
>> writel(val, base + reg);
>> @@ -279,7 +376,9 @@ static void exynos_pcie_deassert_core_reset(struct
>> exynos_pcie *ep)
>> 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);
>> + if (ep->mem_res->block_base)
>> + exynos_pcie_writel(ep->mem_res->block_base, 1,
>> + PCIE_PHY_MAC_RESET);
>
> Good.
>
>> }
>>
>> static void exynos_pcie_assert_phy_reset(struct exynos_pcie *ep)
>> @@ -413,9 +512,6 @@ static int exynos_pcie_establish_link(struct
>> exynos_pcie *ep)
>> if (ep->using_phy) {
>> phy_reset(ep->phy);
>>
>> - exynos_pcie_writel(ep->mem_res->elbi_base, 1,
>> - PCIE_PWR_RESET);
>> -
>> phy_power_on(ep->phy);
>> phy_init(ep->phy);
>> } else {
>> @@ -430,14 +526,16 @@ static int exynos_pcie_establish_link(struct
>> exynos_pcie *ep)
>> udelay(500);
>> exynos_pcie_writel(ep->mem_res->block_base, 0,
>> PCIE_PHY_COMMON_RESET);
>> + exynos_pcie_deassert_core_reset(ep);
>> }
>>
>> - /* pulse for common reset */
>> - exynos_pcie_writel(ep->mem_res->block_base, 1,
>> PCIE_PHY_COMMON_RESET);
>> - udelay(500);
>> - exynos_pcie_writel(ep->mem_res->block_base, 0,
>> PCIE_PHY_COMMON_RESET);
>
> These codes are also necessary for Exyno5440.
> How about moving these codes instead of removing them?
>
> @@ -430,14 +526,16 @@ static int exynos_pcie_establish_link(struct
> exynos_pcie *ep)
> udelay(500);
> exynos_pcie_writel(ep->mem_res->block_base, 0,
> PCIE_PHY_COMMON_RESET);
> + /* pulse for common reset */
> + exynos_pcie_writel(ep->mem_res->block_base, 1,
> + PCIE_PHY_COMMON_RESET);
> + udelay(500);
> + exynos_pcie_writel(ep->mem_res->block_base, 0,
> + PCIE_PHY_COMMON_RESET);
> + exynos_pcie_deassert_core_reset(ep);
> }
>
>
>> + /*
>> + * Enable DBI_RO_WR_EN bit.
>> + * - When set to 1, some RO and HWinit bits are wriatble from
>> + * the local application through the DBI.
>> + */
>> + dw_pcie_writel_dbi(pci, PCIE_MISC_CONTROL_1_OFF, DBI_RO_WR_EN);
>>
>> - exynos_pcie_deassert_core_reset(ep);
>> dw_pcie_setup_rc(pp);
>> exynos_pcie_assert_reset(ep);
>>
>> @@ -472,16 +570,6 @@ static void exynos_pcie_clear_irq_pulse(struct
>> exynos_pcie *ep)
>> exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_PULSE);
>> }
>>
>> -static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep)
>> -{
>> - u32 val;
>> -
>> - /* enable INTX interrupt */
>> - val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
>> - IRQ_INTC_ASSERT | IRQ_INTD_ASSERT;
>> - exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_EN_PULSE);
>> -}
>> -
>> static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
>> {
>> struct exynos_pcie *ep = arg;
>> @@ -513,9 +601,16 @@ static void exynos_pcie_msi_init(struct exynos_pcie
>> *ep)
>> exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_EN_LEVEL);
>> }
>>
>> -static void exynos_pcie_enable_interrupts(struct exynos_pcie *ep)
>> +static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep)
>> {
>> - exynos_pcie_enable_irq_pulse(ep);
>> + u32 val;
>> +
>> + val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
>> + IRQ_INTC_ASSERT | IRQ_INTD_ASSERT;
>> + exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_EN_PULSE);
>> +
>> + exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_IRQ_EN_LEVEL);
>> + exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_IRQ_EN_SPECIAL);
>
> Good.
>
>>
>> if (IS_ENABLED(CONFIG_PCI_MSI))
>> exynos_pcie_msi_init(ep);
>> @@ -575,10 +670,8 @@ static int exynos_pcie_link_up(struct dw_pcie *pci)
>> u32 val;
>>
>> val = exynos_pcie_readl(ep->mem_res->elbi_base,
>> PCIE_ELBI_RDLH_LINKUP);
>> - if (val == PCIE_ELBI_LTSSM_ENABLE)
>> - return 1;
>
> Exynos5440 uses 'PCIE_ELBI_LTSSM_ENABLE'.
> Can you keep this code for Exyno5440?

It's possible to keep, but if it has to keep, then it needs to distinguish between exynos5440 and other exynos.
Although I already mentioned, i needs to get Exynos5440 TRM. :)

Best Regards,
Jaehoon Chung

>
> This register can be added as below.
>
> /* Exynos5440 PCIe ELBI registers */
> #define EXYNOS5440_PCIE_ELBI_RDLH_LINKUP 0x064
> #define EXYNOS5440_PCIE_ELBI_LTSSM_ENABLE BIT(0)
>
> Best regards,
> Jingoo Han
>
>>
>> - return 0;
>> + return (val & PCIE_ELBI_XMLH_LINKUP);
>> }
>>
>> static int exynos_pcie_host_init(struct pcie_port *pp)
>> @@ -587,7 +680,7 @@ static int exynos_pcie_host_init(struct pcie_port *pp)
>> struct exynos_pcie *ep = to_exynos_pcie(pci);
>>
>> exynos_pcie_establish_link(ep);
>> - exynos_pcie_enable_interrupts(ep);
>> + exynos_pcie_enable_irq_pulse(ep);
>>
>> return 0;
>> }
>> @@ -608,8 +701,11 @@ static int __init exynos_add_pcie_port(struct
>> exynos_pcie *ep,
>>
>> pp->irq = platform_get_irq(pdev, 1);
>> if (pp->irq < 0) {
>> - dev_err(dev, "failed to get irq\n");
>> - return pp->irq;
>> + pp->irq = platform_get_irq_byname(pdev, "intr");
>> + if (pp->irq < 0) {
>> + dev_err(dev, "failed to get irq\n");
>> + return pp->irq;
>> + }
>> }
>> ret = devm_request_irq(dev, pp->irq, exynos_pcie_irq_handler,
>> IRQF_SHARED, "exynos-pcie", ep);
>> @@ -678,13 +774,23 @@ static int __init exynos_pcie_probe(struct
>> platform_device *pdev)
>>
>> ep->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
>>
>> - /* Assume that controller doesn't use the PHY framework */
>> - ep->using_phy = false;
>> + /*
>> + * In case of Exynos5440,
>> + * Assume that controller doesn't use the PHY frameork.
>> + * Other SoCs might be used the PHY framework.
>> + */
>> +
>> + if (of_device_is_compatible(np, "samsung,exynos5440-pcie"))
>> + ep->using_phy = false;
>>
>> - ep->phy = devm_of_phy_get(dev, np, NULL);
>> + ep->phy = devm_of_phy_get(dev, np, "pcie-phy");
>> if (IS_ERR(ep->phy)) {
>> if (PTR_ERR(ep->phy) == -EPROBE_DEFER)
>> return PTR_ERR(ep->phy);
>> + if (!of_device_is_compatible(np, "samsung,exynos5440-pcie"))
>> {
>> + dev_err(dev, "Can't find the pcie-phy\n");
>> + return PTR_ERR(ep->phy);
>> + }
>> dev_warn(dev, "Use the 'phy' property. Current DT of pci-
>> exynos was deprecated!!\n");
>> } else
>> ep->using_phy = true;
>> @@ -734,23 +840,20 @@ static int __exit exynos_pcie_remove(struct
>> platform_device *pdev)
>> static const struct of_device_id exynos_pcie_of_match[] = {
>> {
>> .compatible = "samsung,exynos5440-pcie",
>> - .data = &exynos5440_pcie_ops
>> + .data = &exynos5440_pcie_ops,
>> + }, {
>> + .compatible = "samsung,exynos5433-pcie",
>> + .data = &exynos5433_pcie_ops,
>> },
>> {},
>> };
>>
>> static struct platform_driver exynos_pcie_driver = {
>> + .probe = exynos_pcie_probe,
>> .remove = __exit_p(exynos_pcie_remove),
>> .driver = {
>> .name = "exynos-pcie",
>> .of_match_table = exynos_pcie_of_match,
>> },
>> };
>> -
>> -/* Exynos PCIe driver does not allow module unload */
>> -
>> -static int __init exynos_pcie_init(void)
>> -{
>> - return platform_driver_probe(&exynos_pcie_driver,
>> exynos_pcie_probe);
>> -}
>> -subsys_initcall(exynos_pcie_init);
>> +builtin_platform_driver(exynos_pcie_driver);
>> --
>> 2.15.1
>
>
>
>
>

Next message: Andrew Morton: "Re: [PATCH 2/2] mmap.2: MAP_FIXED updated documentation"
Previous message: Eric Anholt: "[PATCH] drm/vc4: Flush the caches before the bin jobs, as well."
In reply to: Jingoo Han: "Re: [RFC 2/2] pci: dwc: pci-exynos: add the codes to support the exynos5433"
Next in thread: Jingoo Han: "Re: [RFC 2/2] pci: dwc: pci-exynos: add the codes to support the exynos5433"
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