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Message-ID: <000501d37f34$f21b03c0$d6510b40$@gmail.com> Date: Wed, 27 Dec 2017 12:05:49 -0500 From: "Jingoo Han" <jingoohan1@...il.com> To: "'Jaehoon Chung'" <jh80.chung@...sung.com>, <linux-pci@...r.kernel.org> Cc: <linux-samsung-soc@...r.kernel.org>, <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>, "'Bjorn Helgaas'" <helgaas@...nel.org>, <robh+dt@...nel.org>, <krzk@...nel.org>, <mark.rutland@....com>, <kgene@...nel.org>, <lorenzo.pieralisi@....com> Subject: Re: [PATCH] PCI: exynos: remove the deprecated phy codes On Wednesday, December 27, 2017 1:43 AM, 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> (I resend my email, because Bjorn's address was wrong in the previous email.) Thank you for your patch. It looks good. Acked-by: Jingoo Han <jingoohan1@...il.com> Best regards, Jingoo Han > --- > .../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); > -- > 2.15.1
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