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Message-ID: <000001d383f1$f9ff4710$edfdd530$@gmail.com>
Date: Tue, 2 Jan 2018 12:49:01 -0500
From: "Jingoo Han" <jingoohan1@...il.com>
To: "'Lorenzo Pieralisi'" <lorenzo.pieralisi@....com>,
"'Jaehoon Chung'" <jh80.chung@...sung.com>
Cc: <linux-pci@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<bhelgaas@...nel.org>, <robh+dt@...nel.org>, <krzk@...nel.org>,
<mark.rutland@....com>, <kgene@...nel.org>
Subject: Re: [PATCH] PCI: exynos: remove the deprecated phy codes
On Tuesday, January 2, 2018 11:34 AM, Lorenzo Pieralisi wrote:
> On Wed, Dec 27, 2017 at 06:43:27PM +0900, Jaehoon Chung wrote:
> > pci-exynos had updated to use the PHY framework.
> > (drivers/phy/samsung/phy-exynos-pcie.c)
> > Removed the depreccated codes relevant to phy in pci-exynos.c.
> > Instead, use the phy-exynos-pcie.c file.
> >
> > Modified the binding documentation.
> >
> > Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
> > ---
> > .../bindings/pci/samsung,exynos5440-pcie.txt | 58 ++----
> > drivers/pci/dwc/pci-exynos.c | 219
++-----------------
> --
> > 2 files changed, 22 insertions(+), 255 deletions(-)
>
> I have updated the commit log to the patch below, please
> check before I push it out.
I think that the commit message looks good.
Thank you.
Best regards,
Jingoo Han
>
> Lorenzo
>
> -- >8 --
> Subject: [PATCH] PCI: exynos: Remove deprecated PHY initialization code
>
> Exynos platforms have a PCI PHY driver in the PHY framework that can be
> used by the PCI host bridge drivers to initialize and manage the PHY.
>
> Remove the deprecated PHY initialization code in the Exynos PCI host
> bridge driver by updating the driver to use the PHY framework API;
> modify the DT binding documentation accordingly.
>
> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
> [lorenzo.pieralisi@....com: updated commit log]
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Acked-by: Jingoo Han <jingoohan1@...il.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
> .../bindings/pci/samsung,exynos5440-pcie.txt | 58 ++----
> drivers/pci/dwc/pci-exynos.c | 219
++------------------
> -
> 2 files changed, 22 insertions(+), 255 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/pci/samsung,exynos5440-
> pcie.txt b/Documentation/devicetree/bindings/pci/samsung,exynos5440-
> pcie.txt
> index 34a11bfbfb60..651d957d1051 100644
> --- a/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
> @@ -6,9 +6,6 @@ and thus inherits all the common properties defined in
> designware-pcie.txt.
> Required properties:
> - compatible: "samsung,exynos5440-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.
> - Use the PHY framework.)
> - reg-names : First name should be set to "elbi".
> And use the "config" instead of getting the configuration address
> space
> from "ranges".
> @@ -23,49 +20,8 @@ For other common properties, refer to
>
> Example:
>
> -SoC-specific DT Entry:
> +SoC-specific DT Entry (with using PHY framework):
>
> - pcie@...000 {
> - compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
> - reg = <0x290000 0x1000
> - 0x270000 0x1000
> - 0x271000 0x40>;
> - interrupts = <0 20 0>, <0 21 0>, <0 22 0>;
> - clocks = <&clock 28>, <&clock 27>;
> - clock-names = "pcie", "pcie_bus";
> - #address-cells = <3>;
> - #size-cells = <2>;
> - device_type = "pci";
> - ranges = <0x00000800 0 0x40000000 0x40000000 0 0x00001000
> /* configuration space */
> - 0x81000000 0 0 0x40001000 0 0x00010000
/*
> downstream I/O */
> - 0x82000000 0 0x40011000 0x40011000 0 0x1ffef000>;
/*
> non-prefetchable memory */
> - #interrupt-cells = <1>;
> - interrupt-map-mask = <0 0 0 0>;
> - interrupt-map = <0 0 0 0 &gic GIC_SPI 21
> IRQ_TYPE_LEVEL_HIGH>;
> - num-lanes = <4>;
> - };
> -
> - pcie@...000 {
> - compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
> - reg = <0x2a0000 0x1000
> - 0x272000 0x1000
> - 0x271040 0x40>;
> - interrupts = <0 23 0>, <0 24 0>, <0 25 0>;
> - clocks = <&clock 29>, <&clock 27>;
> - clock-names = "pcie", "pcie_bus";
> - #address-cells = <3>;
> - #size-cells = <2>;
> - device_type = "pci";
> - ranges = <0x00000800 0 0x60000000 0x60000000 0 0x00001000
> /* configuration space */
> - 0x81000000 0 0 0x60001000 0 0x00010000
/*
> downstream I/O */
> - 0x82000000 0 0x60011000 0x60011000 0 0x1ffef000>;
/*
> non-prefetchable memory */
> - #interrupt-cells = <1>;
> - interrupt-map-mask = <0 0 0 0>;
> - interrupt-map = <0 0 0 0 &gic GIC_SPI 24
> IRQ_TYPE_LEVEL_HIGH>;
> - num-lanes = <4>;
> - };
> -
> -With using PHY framework:
> pcie_phy0: pcie-phy@...000 {
> ...
> reg = <0x270000 0x1000>, <0x271000 0x40>;
> @@ -74,13 +30,21 @@ With using PHY framework:
> };
>
> pcie@...000 {
> - ...
> + compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
> reg = <0x290000 0x1000>, <0x40000000 0x1000>;
> reg-names = "elbi", "config";
> + clocks = <&clock 28>, <&clock 27>;
> + clock-names = "pcie", "pcie_bus";
> + #address-cells = <3>;
> + #size-cells = <2>;
> + device_type = "pci";
> phys = <&pcie_phy0>;
> ranges = <0x81000000 0 0 0x60001000 0 0x00010000
> 0x82000000 0 0x60011000 0x60011000 0 0x1ffef000>;
> - ...
> + #interrupt-cells = <1>;
> + interrupt-map-mask = <0 0 0 0>;
> + interrupt-map = <0 0 0 0 &gic GIC_SPI 21
> IRQ_TYPE_LEVEL_HIGH>;
> + num-lanes = <4>;
> };
>
> Board-specific DT Entry:
> diff --git a/drivers/pci/dwc/pci-exynos.c b/drivers/pci/dwc/pci-exynos.c
> index 5596fdedbb94..56f32aeebd0a 100644
> --- a/drivers/pci/dwc/pci-exynos.c
> +++ b/drivers/pci/dwc/pci-exynos.c
> @@ -55,49 +55,8 @@
> #define PCIE_ELBI_SLV_ARMISC 0x120
> #define PCIE_ELBI_SLV_DBI_ENABLE BIT(21)
>
> -/* PCIe Purple registers */
> -#define PCIE_PHY_GLOBAL_RESET 0x000
> -#define PCIE_PHY_COMMON_RESET 0x004
> -#define PCIE_PHY_CMN_REG 0x008
> -#define PCIE_PHY_MAC_RESET 0x00c
> -#define PCIE_PHY_PLL_LOCKED 0x010
> -#define PCIE_PHY_TRSVREG_RESET 0x020
> -#define PCIE_PHY_TRSV_RESET 0x024
> -
> -/* PCIe PHY registers */
> -#define PCIE_PHY_IMPEDANCE 0x004
> -#define PCIE_PHY_PLL_DIV_0 0x008
> -#define PCIE_PHY_PLL_BIAS 0x00c
> -#define PCIE_PHY_DCC_FEEDBACK 0x014
> -#define PCIE_PHY_PLL_DIV_1 0x05c
> -#define PCIE_PHY_COMMON_POWER 0x064
> -#define PCIE_PHY_COMMON_PD_CMN BIT(3)
> -#define PCIE_PHY_TRSV0_EMP_LVL 0x084
> -#define PCIE_PHY_TRSV0_DRV_LVL 0x088
> -#define PCIE_PHY_TRSV0_RXCDR 0x0ac
> -#define PCIE_PHY_TRSV0_POWER 0x0c4
> -#define PCIE_PHY_TRSV0_PD_TSV BIT(7)
> -#define PCIE_PHY_TRSV0_LVCC 0x0dc
> -#define PCIE_PHY_TRSV1_EMP_LVL 0x144
> -#define PCIE_PHY_TRSV1_RXCDR 0x16c
> -#define PCIE_PHY_TRSV1_POWER 0x184
> -#define PCIE_PHY_TRSV1_PD_TSV BIT(7)
> -#define PCIE_PHY_TRSV1_LVCC 0x19c
> -#define PCIE_PHY_TRSV2_EMP_LVL 0x204
> -#define PCIE_PHY_TRSV2_RXCDR 0x22c
> -#define PCIE_PHY_TRSV2_POWER 0x244
> -#define PCIE_PHY_TRSV2_PD_TSV BIT(7)
> -#define PCIE_PHY_TRSV2_LVCC 0x25c
> -#define PCIE_PHY_TRSV3_EMP_LVL 0x2c4
> -#define PCIE_PHY_TRSV3_RXCDR 0x2ec
> -#define PCIE_PHY_TRSV3_POWER 0x304
> -#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 {
> @@ -112,8 +71,6 @@ struct exynos_pcie {
> const struct exynos_pcie_ops *ops;
> int reset_gpio;
>
> - /* For Generic PHY Framework */
> - bool using_phy;
> struct phy *phy;
> };
>
> @@ -141,20 +98,6 @@ static int exynos5440_pcie_get_mem_resources(struct
> platform_device *pdev,
> if (IS_ERR(ep->mem_res->elbi_base))
> return PTR_ERR(ep->mem_res->elbi_base);
>
> - /* If using the PHY framework, doesn't need to get other resource
> */
> - if (ep->using_phy)
> - return 0;
> -
> - 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;
> }
>
> @@ -279,111 +222,6 @@ 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);
> -}
> -
> -static void exynos_pcie_assert_phy_reset(struct exynos_pcie *ep)
> -{
> - 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->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->mem_res->phy_base,
> PCIE_PHY_COMMON_POWER);
> - val &= ~PCIE_PHY_COMMON_PD_CMN;
> - exynos_pcie_writel(ep->mem_res->phy_base, val,
> PCIE_PHY_COMMON_POWER);
> -
> - val = exynos_pcie_readl(ep->mem_res->phy_base,
> PCIE_PHY_TRSV0_POWER);
> - val &= ~PCIE_PHY_TRSV0_PD_TSV;
> - exynos_pcie_writel(ep->mem_res->phy_base, val,
> PCIE_PHY_TRSV0_POWER);
> -
> - val = exynos_pcie_readl(ep->mem_res->phy_base,
> PCIE_PHY_TRSV1_POWER);
> - val &= ~PCIE_PHY_TRSV1_PD_TSV;
> - exynos_pcie_writel(ep->mem_res->phy_base, val,
> PCIE_PHY_TRSV1_POWER);
> -
> - val = exynos_pcie_readl(ep->mem_res->phy_base,
> PCIE_PHY_TRSV2_POWER);
> - val &= ~PCIE_PHY_TRSV2_PD_TSV;
> - exynos_pcie_writel(ep->mem_res->phy_base, val,
> PCIE_PHY_TRSV2_POWER);
> -
> - val = exynos_pcie_readl(ep->mem_res->phy_base,
> PCIE_PHY_TRSV3_POWER);
> - val &= ~PCIE_PHY_TRSV3_PD_TSV;
> - 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->mem_res->phy_base,
> PCIE_PHY_COMMON_POWER);
> - val |= PCIE_PHY_COMMON_PD_CMN;
> - exynos_pcie_writel(ep->mem_res->phy_base, val,
> PCIE_PHY_COMMON_POWER);
> -
> - val = exynos_pcie_readl(ep->mem_res->phy_base,
> PCIE_PHY_TRSV0_POWER);
> - val |= PCIE_PHY_TRSV0_PD_TSV;
> - exynos_pcie_writel(ep->mem_res->phy_base, val,
> PCIE_PHY_TRSV0_POWER);
> -
> - val = exynos_pcie_readl(ep->mem_res->phy_base,
> PCIE_PHY_TRSV1_POWER);
> - val |= PCIE_PHY_TRSV1_PD_TSV;
> - exynos_pcie_writel(ep->mem_res->phy_base, val,
> PCIE_PHY_TRSV1_POWER);
> -
> - val = exynos_pcie_readl(ep->mem_res->phy_base,
> PCIE_PHY_TRSV2_POWER);
> - val |= PCIE_PHY_TRSV2_PD_TSV;
> - exynos_pcie_writel(ep->mem_res->phy_base, val,
> PCIE_PHY_TRSV2_POWER);
> -
> - val = exynos_pcie_readl(ep->mem_res->phy_base,
> PCIE_PHY_TRSV3_POWER);
> - val |= PCIE_PHY_TRSV3_PD_TSV;
> - 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->mem_res->phy_base, 0x29,
> PCIE_PHY_DCC_FEEDBACK);
> -
> - /* set TX/RX impedance */
> - exynos_pcie_writel(ep->mem_res->phy_base, 0xd5, PCIE_PHY_IMPEDANCE);
> -
> - /* set 50Mhz PHY clock */
> - 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->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->mem_res->phy_base, 0x0,
> PCIE_PHY_TRSV0_EMP_LVL);
> -
> - /* set RX clock and data recovery bandwidth */
> - 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->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->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 *ep)
> @@ -401,7 +239,6 @@ static int exynos_pcie_establish_link(struct
> exynos_pcie *ep)
> struct dw_pcie *pci = ep->pci;
> struct pcie_port *pp = &pci->pp;
> struct device *dev = pci->dev;
> - u32 val;
>
> if (dw_pcie_link_up(pci)) {
> dev_err(dev, "Link already up\n");
> @@ -410,32 +247,13 @@ static int exynos_pcie_establish_link(struct
> exynos_pcie *ep)
>
> exynos_pcie_assert_core_reset(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 {
> - exynos_pcie_assert_phy_reset(ep);
> - exynos_pcie_deassert_phy_reset(ep);
> - exynos_pcie_power_on_phy(ep);
> - exynos_pcie_init_phy(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);
> - }
> + phy_reset(ep->phy);
>
> - /* 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_writel(ep->mem_res->elbi_base, 1,
> + PCIE_PWR_RESET);
> +
> + phy_power_on(ep->phy);
> + phy_init(ep->phy);
>
> exynos_pcie_deassert_core_reset(ep);
> dw_pcie_setup_rc(pp);
> @@ -449,18 +267,7 @@ static int exynos_pcie_establish_link(struct
> exynos_pcie *ep)
> if (!dw_pcie_wait_for_link(pci))
> return 0;
>
> - if (ep->using_phy) {
> - phy_power_off(ep->phy);
> - return -ETIMEDOUT;
> - }
> -
> - while (exynos_pcie_readl(ep->mem_res->phy_base,
> - PCIE_PHY_PLL_LOCKED) == 0) {
> - val = exynos_pcie_readl(ep->mem_res->block_base,
> - PCIE_PHY_PLL_LOCKED);
> - dev_info(dev, "PLL Locked: 0x%x\n", val);
> - }
> - exynos_pcie_power_off_phy(ep);
> + phy_power_off(ep->phy);
> return -ETIMEDOUT;
> }
>
> @@ -678,16 +485,13 @@ 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;
> -
> ep->phy = devm_of_phy_get(dev, np, NULL);
> if (IS_ERR(ep->phy)) {
> if (PTR_ERR(ep->phy) == -EPROBE_DEFER)
> 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;
> +
> + ep->phy = NULL;
> + }
>
> if (ep->ops && ep->ops->get_mem_resources) {
> ret = ep->ops->get_mem_resources(pdev, ep);
> @@ -713,8 +517,7 @@ static int __init exynos_pcie_probe(struct
> platform_device *pdev)
> return 0;
>
> fail_probe:
> - if (ep->using_phy)
> - phy_exit(ep->phy);
> + phy_exit(ep->phy);
>
> if (ep->ops && ep->ops->deinit_clk_resources)
> ep->ops->deinit_clk_resources(ep);
> --
> 2.15.0
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