| Message ID | 1637200489-11855-6-git-send-email-hongxing.zhu@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add the imx8m pcie phy driver and imx8mm pcie support | expand |
On 18-11-21, 09:54, Richard Zhu wrote: > Add the standalone i.MX8 PCIe PHY driver. > > Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com> > Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com> > Reviewed-by: Tim Harvey <tharvey@gateworks.com> > Tested-by: Tim Harvey <tharvey@gateworks.com> > --- > drivers/phy/freescale/Kconfig | 9 + > drivers/phy/freescale/Makefile | 1 + > drivers/phy/freescale/phy-fsl-imx8m-pcie.c | 237 +++++++++++++++++++++ > 3 files changed, 247 insertions(+) > create mode 100644 drivers/phy/freescale/phy-fsl-imx8m-pcie.c > > diff --git a/drivers/phy/freescale/Kconfig b/drivers/phy/freescale/Kconfig > index 320630ffe3cd..e821498b1f7f 100644 > --- a/drivers/phy/freescale/Kconfig > +++ b/drivers/phy/freescale/Kconfig > @@ -14,3 +14,12 @@ config PHY_MIXEL_MIPI_DPHY > help > Enable this to add support for the Mixel DSI PHY as found > on NXP's i.MX8 family of SOCs. > + > +config PHY_FSL_IMX8M_PCIE > + tristate "Freescale i.MX8M PCIE PHY" > + depends on OF && HAS_IOMEM > + select GENERIC_PHY > + default ARCH_MXC && ARM64 Why should this be default ? We dont do that for new drivers.. You may add this to respective config file though... > +static int imx8_pcie_phy_init(struct phy *phy) > +{ > + int ret; > + u32 val, pad_mode; > + struct imx8_pcie_phy *imx8_phy = phy_get_drvdata(phy); > + > + reset_control_assert(imx8_phy->reset); > + > + pad_mode = imx8_phy->refclk_pad_mode; > + /* Set AUX_EN_OVERRIDE 1'b0, when the CLKREQ# isn't hooked */ > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > + IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE, > + imx8_phy->clkreq_unused ? > + 0 : IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE); > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > + IMX8MM_GPR_PCIE_AUX_EN, > + IMX8MM_GPR_PCIE_AUX_EN); > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > + IMX8MM_GPR_PCIE_POWER_OFF, 0); > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > + IMX8MM_GPR_PCIE_SSC_EN, 0); > + > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > + IMX8MM_GPR_PCIE_REF_CLK_SEL, > + pad_mode == IMX8_PCIE_REFCLK_PAD_INPUT ? > + IMX8MM_GPR_PCIE_REF_CLK_EXT : > + IMX8MM_GPR_PCIE_REF_CLK_PLL); > + usleep_range(100, 200); > + > + /* Do the PHY common block reset */ > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > + IMX8MM_GPR_PCIE_CMN_RST, > + IMX8MM_GPR_PCIE_CMN_RST); > + usleep_range(200, 500); > + > + No multi blank line please > +static struct platform_driver imx8_pcie_phy_driver = { > + .probe = imx8_pcie_phy_probe, > + .driver = { > + .name = "imx8-pcie-phy", > + .of_match_table = imx8_pcie_phy_of_match, > + } > +}; > +module_platform_driver(imx8_pcie_phy_driver); > + > +MODULE_DESCRIPTION("FSL IMX8 PCIE PHY driver"); > +MODULE_LICENSE("GPL"); This does not match the SPDX tag you have given
> -----Original Message----- > From: Vinod Koul <vkoul@kernel.org> > Sent: Thursday, December 2, 2021 12:30 PM > To: Hongxing Zhu <hongxing.zhu@nxp.com> > Cc: l.stach@pengutronix.de; bhelgaas@google.com; > lorenzo.pieralisi@arm.com; Marcel Ziswiler > <marcel.ziswiler@toradex.com>; tharvey@gateworks.com; > kishon@ti.com; robh@kernel.org; galak@kernel.crashing.org; > shawnguo@kernel.org; linux-phy@lists.infradead.org; > devicetree@vger.kernel.org; linux-pci@vger.kernel.org; > linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org; > kernel@pengutronix.de; dl-linux-imx <linux-imx@nxp.com> > Subject: Re: [PATCH v6 5/8] phy: freescale: pcie: Initialize the imx8 pcie > standalone phy driver > > On 18-11-21, 09:54, Richard Zhu wrote: > > Add the standalone i.MX8 PCIe PHY driver. > > > > Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com> > > Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com> > > Reviewed-by: Tim Harvey <tharvey@gateworks.com> > > Tested-by: Tim Harvey <tharvey@gateworks.com> > > --- > > drivers/phy/freescale/Kconfig | 9 + > > drivers/phy/freescale/Makefile | 1 + > > drivers/phy/freescale/phy-fsl-imx8m-pcie.c | 237 > > +++++++++++++++++++++ > > 3 files changed, 247 insertions(+) > > create mode 100644 drivers/phy/freescale/phy-fsl-imx8m-pcie.c > > > > diff --git a/drivers/phy/freescale/Kconfig > > b/drivers/phy/freescale/Kconfig index 320630ffe3cd..e821498b1f7f > > 100644 > > --- a/drivers/phy/freescale/Kconfig > > +++ b/drivers/phy/freescale/Kconfig > > @@ -14,3 +14,12 @@ config PHY_MIXEL_MIPI_DPHY > > help > > Enable this to add support for the Mixel DSI PHY as found > > on NXP's i.MX8 family of SOCs. > > + > > +config PHY_FSL_IMX8M_PCIE > > + tristate "Freescale i.MX8M PCIE PHY" > > + depends on OF && HAS_IOMEM > > + select GENERIC_PHY > > + default ARCH_MXC && ARM64 > > Why should this be default ? We dont do that for new drivers.. You may > add this to respective config file though... > [Richard Zhu] First of all, thanks a lot for your review comments. I see, and would remove the default in the kconfig. > > +static int imx8_pcie_phy_init(struct phy *phy) { > > + int ret; > > + u32 val, pad_mode; > > + struct imx8_pcie_phy *imx8_phy = phy_get_drvdata(phy); > > + > > + reset_control_assert(imx8_phy->reset); > > + > > + pad_mode = imx8_phy->refclk_pad_mode; > > + /* Set AUX_EN_OVERRIDE 1'b0, when the CLKREQ# isn't hooked */ > > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > > + IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE, > > + imx8_phy->clkreq_unused ? > > + 0 : IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE); > > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > > + IMX8MM_GPR_PCIE_AUX_EN, > > + IMX8MM_GPR_PCIE_AUX_EN); > > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > > + IMX8MM_GPR_PCIE_POWER_OFF, 0); > > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > > + IMX8MM_GPR_PCIE_SSC_EN, 0); > > + > > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > > + IMX8MM_GPR_PCIE_REF_CLK_SEL, > > + pad_mode == IMX8_PCIE_REFCLK_PAD_INPUT ? > > + IMX8MM_GPR_PCIE_REF_CLK_EXT : > > + IMX8MM_GPR_PCIE_REF_CLK_PLL); > > + usleep_range(100, 200); > > + > > + /* Do the PHY common block reset */ > > + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, > > + IMX8MM_GPR_PCIE_CMN_RST, > > + IMX8MM_GPR_PCIE_CMN_RST); > > + usleep_range(200, 500); > > + > > + > > No multi blank line please [Richard Zhu] Ok, got that. > > > +static struct platform_driver imx8_pcie_phy_driver = { > > + .probe = imx8_pcie_phy_probe, > > + .driver = { > > + .name = "imx8-pcie-phy", > > + .of_match_table = imx8_pcie_phy_of_match, > > + } > > +}; > > +module_platform_driver(imx8_pcie_phy_driver); > > + > > +MODULE_DESCRIPTION("FSL IMX8 PCIE PHY driver"); > > +MODULE_LICENSE("GPL"); > > This does not match the SPDX tag you have given [Richard Zhu] Should the "GPL v2" correct one? If yes, I would change it this way later. Thanks. Best Regards Richard > > -- > ~Vinod
On 02-12-21, 05:57, Hongxing Zhu wrote: > > > +static struct platform_driver imx8_pcie_phy_driver = { > > > + .probe = imx8_pcie_phy_probe, > > > + .driver = { > > > + .name = "imx8-pcie-phy", > > > + .of_match_table = imx8_pcie_phy_of_match, > > > + } > > > +}; > > > +module_platform_driver(imx8_pcie_phy_driver); > > > + > > > +MODULE_DESCRIPTION("FSL IMX8 PCIE PHY driver"); > > > +MODULE_LICENSE("GPL"); > > > > This does not match the SPDX tag you have given > [Richard Zhu] Should the "GPL v2" correct one? > If yes, I would change it this way later. That would match spdx tag
diff --git a/drivers/phy/freescale/Kconfig b/drivers/phy/freescale/Kconfig index 320630ffe3cd..e821498b1f7f 100644 --- a/drivers/phy/freescale/Kconfig +++ b/drivers/phy/freescale/Kconfig @@ -14,3 +14,12 @@ config PHY_MIXEL_MIPI_DPHY help Enable this to add support for the Mixel DSI PHY as found on NXP's i.MX8 family of SOCs. + +config PHY_FSL_IMX8M_PCIE + tristate "Freescale i.MX8M PCIE PHY" + depends on OF && HAS_IOMEM + select GENERIC_PHY + default ARCH_MXC && ARM64 + help + Enable this to add support for the PCIE PHY as found on + i.MX8M family of SOCs. diff --git a/drivers/phy/freescale/Makefile b/drivers/phy/freescale/Makefile index 1d02e3869b45..55d07c742ab0 100644 --- a/drivers/phy/freescale/Makefile +++ b/drivers/phy/freescale/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_PHY_FSL_IMX8MQ_USB) += phy-fsl-imx8mq-usb.o obj-$(CONFIG_PHY_MIXEL_MIPI_DPHY) += phy-fsl-imx8-mipi-dphy.o +obj-$(CONFIG_PHY_FSL_IMX8M_PCIE) += phy-fsl-imx8m-pcie.o diff --git a/drivers/phy/freescale/phy-fsl-imx8m-pcie.c b/drivers/phy/freescale/phy-fsl-imx8m-pcie.c new file mode 100644 index 000000000000..357483a7efeb --- /dev/null +++ b/drivers/phy/freescale/phy-fsl-imx8m-pcie.c @@ -0,0 +1,237 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2021 NXP + */ + +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/delay.h> +#include <linux/mfd/syscon.h> +#include <linux/mfd/syscon/imx7-iomuxc-gpr.h> +#include <linux/module.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/reset.h> +#include <dt-bindings/phy/phy-imx8-pcie.h> + +#define IMX8MM_PCIE_PHY_CMN_REG061 0x184 +#define ANA_PLL_CLK_OUT_TO_EXT_IO_EN BIT(0) +#define IMX8MM_PCIE_PHY_CMN_REG062 0x188 +#define ANA_PLL_CLK_OUT_TO_EXT_IO_SEL BIT(3) +#define IMX8MM_PCIE_PHY_CMN_REG063 0x18C +#define AUX_PLL_REFCLK_SEL_SYS_PLL GENMASK(7, 6) +#define IMX8MM_PCIE_PHY_CMN_REG064 0x190 +#define ANA_AUX_RX_TX_SEL_TX BIT(7) +#define ANA_AUX_RX_TERM_GND_EN BIT(3) +#define ANA_AUX_TX_TERM BIT(2) +#define IMX8MM_PCIE_PHY_CMN_REG065 0x194 +#define ANA_AUX_RX_TERM (BIT(7) | BIT(4)) +#define ANA_AUX_TX_LVL GENMASK(3, 0) +#define IMX8MM_PCIE_PHY_CMN_REG75 0x1D4 +#define PCIE_PHY_CMN_REG75_PLL_DONE 0x3 +#define PCIE_PHY_TRSV_REG5 0x414 +#define PCIE_PHY_TRSV_REG5_GEN1_DEEMP 0x2D +#define PCIE_PHY_TRSV_REG6 0x418 +#define PCIE_PHY_TRSV_REG6_GEN2_DEEMP 0xF + +#define IMX8MM_GPR_PCIE_REF_CLK_SEL GENMASK(25, 24) +#define IMX8MM_GPR_PCIE_REF_CLK_PLL FIELD_PREP(IMX8MM_GPR_PCIE_REF_CLK_SEL, 0x3) +#define IMX8MM_GPR_PCIE_REF_CLK_EXT FIELD_PREP(IMX8MM_GPR_PCIE_REF_CLK_SEL, 0x2) +#define IMX8MM_GPR_PCIE_AUX_EN BIT(19) +#define IMX8MM_GPR_PCIE_CMN_RST BIT(18) +#define IMX8MM_GPR_PCIE_POWER_OFF BIT(17) +#define IMX8MM_GPR_PCIE_SSC_EN BIT(16) +#define IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE BIT(9) + +struct imx8_pcie_phy { + void __iomem *base; + struct clk *clk; + struct phy *phy; + struct regmap *iomuxc_gpr; + struct reset_control *reset; + u32 refclk_pad_mode; + u32 tx_deemph_gen1; + u32 tx_deemph_gen2; + bool clkreq_unused; +}; + +static int imx8_pcie_phy_init(struct phy *phy) +{ + int ret; + u32 val, pad_mode; + struct imx8_pcie_phy *imx8_phy = phy_get_drvdata(phy); + + reset_control_assert(imx8_phy->reset); + + pad_mode = imx8_phy->refclk_pad_mode; + /* Set AUX_EN_OVERRIDE 1'b0, when the CLKREQ# isn't hooked */ + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, + IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE, + imx8_phy->clkreq_unused ? + 0 : IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE); + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, + IMX8MM_GPR_PCIE_AUX_EN, + IMX8MM_GPR_PCIE_AUX_EN); + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, + IMX8MM_GPR_PCIE_POWER_OFF, 0); + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, + IMX8MM_GPR_PCIE_SSC_EN, 0); + + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, + IMX8MM_GPR_PCIE_REF_CLK_SEL, + pad_mode == IMX8_PCIE_REFCLK_PAD_INPUT ? + IMX8MM_GPR_PCIE_REF_CLK_EXT : + IMX8MM_GPR_PCIE_REF_CLK_PLL); + usleep_range(100, 200); + + /* Do the PHY common block reset */ + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, + IMX8MM_GPR_PCIE_CMN_RST, + IMX8MM_GPR_PCIE_CMN_RST); + usleep_range(200, 500); + + + if (pad_mode == IMX8_PCIE_REFCLK_PAD_INPUT) { + /* Configure the pad as input */ + val = readl(imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061); + writel(val & ~ANA_PLL_CLK_OUT_TO_EXT_IO_EN, + imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061); + } else if (pad_mode == IMX8_PCIE_REFCLK_PAD_OUTPUT) { + /* Configure the PHY to output the refclock via pad */ + writel(ANA_PLL_CLK_OUT_TO_EXT_IO_EN, + imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061); + writel(ANA_PLL_CLK_OUT_TO_EXT_IO_SEL, + imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG062); + writel(AUX_PLL_REFCLK_SEL_SYS_PLL, + imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG063); + val = ANA_AUX_RX_TX_SEL_TX | ANA_AUX_TX_TERM; + writel(val | ANA_AUX_RX_TERM_GND_EN, + imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG064); + writel(ANA_AUX_RX_TERM | ANA_AUX_TX_LVL, + imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG065); + } + + /* Tune PHY de-emphasis setting to pass PCIe compliance. */ + if (imx8_phy->tx_deemph_gen1) + writel(imx8_phy->tx_deemph_gen1, + imx8_phy->base + PCIE_PHY_TRSV_REG5); + if (imx8_phy->tx_deemph_gen2) + writel(imx8_phy->tx_deemph_gen2, + imx8_phy->base + PCIE_PHY_TRSV_REG6); + + reset_control_deassert(imx8_phy->reset); + + /* Polling to check the phy is ready or not. */ + ret = readl_poll_timeout(imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG75, + val, val == PCIE_PHY_CMN_REG75_PLL_DONE, + 10, 20000); + return ret; +} + +static int imx8_pcie_phy_power_on(struct phy *phy) +{ + struct imx8_pcie_phy *imx8_phy = phy_get_drvdata(phy); + + return clk_prepare_enable(imx8_phy->clk); +} + +static int imx8_pcie_phy_power_off(struct phy *phy) +{ + struct imx8_pcie_phy *imx8_phy = phy_get_drvdata(phy); + + clk_disable_unprepare(imx8_phy->clk); + + return 0; +} + +static const struct phy_ops imx8_pcie_phy_ops = { + .init = imx8_pcie_phy_init, + .power_on = imx8_pcie_phy_power_on, + .power_off = imx8_pcie_phy_power_off, + .owner = THIS_MODULE, +}; + +static int imx8_pcie_phy_probe(struct platform_device *pdev) +{ + struct phy_provider *phy_provider; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct imx8_pcie_phy *imx8_phy; + struct resource *res; + + imx8_phy = devm_kzalloc(dev, sizeof(*imx8_phy), GFP_KERNEL); + if (!imx8_phy) + return -ENOMEM; + + /* get PHY refclk pad mode */ + of_property_read_u32(np, "fsl,refclk-pad-mode", + &imx8_phy->refclk_pad_mode); + + if (of_property_read_u32(np, "fsl,tx-deemph-gen1", + &imx8_phy->tx_deemph_gen1)) + imx8_phy->tx_deemph_gen1 = 0; + + if (of_property_read_u32(np, "fsl,tx-deemph-gen2", + &imx8_phy->tx_deemph_gen2)) + imx8_phy->tx_deemph_gen2 = 0; + + if (of_property_read_bool(np, "fsl,clkreq-unsupported")) + imx8_phy->clkreq_unused = true; + else + imx8_phy->clkreq_unused = false; + + imx8_phy->clk = devm_clk_get(dev, "ref"); + if (IS_ERR(imx8_phy->clk)) { + dev_err(dev, "failed to get imx pcie phy clock\n"); + return PTR_ERR(imx8_phy->clk); + } + + /* Grab GPR config register range */ + imx8_phy->iomuxc_gpr = + syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr"); + if (IS_ERR(imx8_phy->iomuxc_gpr)) { + dev_err(dev, "unable to find iomuxc registers\n"); + return PTR_ERR(imx8_phy->iomuxc_gpr); + } + + imx8_phy->reset = devm_reset_control_get_exclusive(dev, "pciephy"); + if (IS_ERR(imx8_phy->reset)) { + dev_err(dev, "Failed to get PCIEPHY reset control\n"); + return PTR_ERR(imx8_phy->reset); + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + imx8_phy->base = devm_ioremap_resource(dev, res); + if (IS_ERR(imx8_phy->base)) + return PTR_ERR(imx8_phy->base); + + imx8_phy->phy = devm_phy_create(dev, NULL, &imx8_pcie_phy_ops); + if (IS_ERR(imx8_phy->phy)) + return PTR_ERR(imx8_phy->phy); + + phy_set_drvdata(imx8_phy->phy, imx8_phy); + + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(phy_provider); +} + +static const struct of_device_id imx8_pcie_phy_of_match[] = { + {.compatible = "fsl,imx8mm-pcie-phy",}, + { }, +}; +MODULE_DEVICE_TABLE(of, imx8_pcie_phy_of_match); + +static struct platform_driver imx8_pcie_phy_driver = { + .probe = imx8_pcie_phy_probe, + .driver = { + .name = "imx8-pcie-phy", + .of_match_table = imx8_pcie_phy_of_match, + } +}; +module_platform_driver(imx8_pcie_phy_driver); + +MODULE_DESCRIPTION("FSL IMX8 PCIE PHY driver"); +MODULE_LICENSE("GPL");