| Message ID | 1634028078-2387-10-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 Tue, 2021-10-12 at 16:41 +0800, Richard Zhu wrote: > i.MX8MM PCIe works mostly like the i.MX8MQ one, but has a different PHY > and allows to output the internal PHY reference clock via the refclk pad. > Add the i.MX8MM PCIe support based on the standalone PHY driver. > > Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com> > --- > [...] > @@ -1130,6 +1176,14 @@ static int imx6_pcie_probe(struct platform_device *pdev) > &imx6_pcie->tx_swing_low)) > imx6_pcie->tx_swing_low = 127; > > + /* get PHY refclk pad mode if there is PHY node */ > + phy_node = of_parse_phandle(node, "phys", 0); > + if (phy_node) { > + of_property_read_u32(phy_node, "fsl,refclk-pad-mode", > + &imx6_pcie->refclk_pad_mode); It seems to me that the refclk_pad_mode is not actually used by this driver anymore, because it is handled by the PHY driver now. Is there a reason to read this property here at all?
> -----Original Message----- > From: Matthias Schiffer <matthias.schiffer@ew.tq-group.com> > Sent: Wednesday, October 13, 2021 8:46 PM > To: Richard Zhu <hongxing.zhu@nxp.com> > Cc: linux-phy@lists.infradead.org; devicetree@vger.kernel.org; > linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org; > kernel@pengutronix.de; dl-linux-imx <linux-imx@nxp.com>; > l.stach@pengutronix.de; tharvey@gateworks.com; kishon@ti.com; > vkoul@kernel.org; robh@kernel.org; galak@kernel.crashing.org; > shawnguo@kernel.org > Subject: Re: [PATCH v3 9/9] PCI: imx: add the imx8mm pcie support > > On Tue, 2021-10-12 at 16:41 +0800, Richard Zhu wrote: > > i.MX8MM PCIe works mostly like the i.MX8MQ one, but has a different > > PHY and allows to output the internal PHY reference clock via the refclk > pad. > > Add the i.MX8MM PCIe support based on the standalone PHY driver. > > > > Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com> > > --- > > [...] > > @@ -1130,6 +1176,14 @@ static int imx6_pcie_probe(struct > platform_device *pdev) > > &imx6_pcie->tx_swing_low)) > > imx6_pcie->tx_swing_low = 127; > > > > + /* get PHY refclk pad mode if there is PHY node */ > > + phy_node = of_parse_phandle(node, "phys", 0); > > + if (phy_node) { > > + of_property_read_u32(phy_node, "fsl,refclk-pad-mode", > > + &imx6_pcie->refclk_pad_mode); > > It seems to me that the refclk_pad_mode is not actually used by this driver > anymore, because it is handled by the PHY driver now. Is there a reason to > read this property here at all? > [Richard Zhu] Good caught. I forgot to clean up the refclk_pad_mode in controller driver. Would remove these codes later. Thanks a lot. Best Regards Richard Zhu
Am Dienstag, dem 12.10.2021 um 16:41 +0800 schrieb Richard Zhu: > i.MX8MM PCIe works mostly like the i.MX8MQ one, but has a different PHY > and allows to output the internal PHY reference clock via the refclk pad. > Add the i.MX8MM PCIe support based on the standalone PHY driver. > > Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com> > --- > drivers/pci/controller/dwc/pci-imx6.c | 63 ++++++++++++++++++++++++++- > 1 file changed, 61 insertions(+), 2 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c > index 26f49f797b0f..73022e37b1c5 100644 > --- a/drivers/pci/controller/dwc/pci-imx6.c > +++ b/drivers/pci/controller/dwc/pci-imx6.c > @@ -29,6 +29,7 @@ > #include <linux/types.h> > #include <linux/interrupt.h> > #include <linux/reset.h> > +#include <linux/phy/phy.h> > #include <linux/pm_domain.h> > #include <linux/pm_runtime.h> > > @@ -49,6 +50,7 @@ enum imx6_pcie_variants { > IMX6QP, > IMX7D, > IMX8MQ, > + IMX8MM, > }; > > #define IMX6_PCIE_FLAG_IMX6_PHY BIT(0) > @@ -80,6 +82,7 @@ struct imx6_pcie { > u32 tx_deemph_gen2_6db; > u32 tx_swing_full; > u32 tx_swing_low; > + u32 refclk_pad_mode; As Matthias already noticed: drop this. > struct regulator *vpcie; > struct regulator *vph; > void __iomem *phy_base; > @@ -88,6 +91,7 @@ struct imx6_pcie { > struct device *pd_pcie; > /* power domain for pcie phy */ > struct device *pd_pcie_phy; > + struct phy *phy; > const struct imx6_pcie_drvdata *drvdata; > }; > > @@ -372,6 +376,8 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) > case IMX7D: > case IMX8MQ: > reset_control_assert(imx6_pcie->pciephy_reset); > + fallthrough; > + case IMX8MM: > reset_control_assert(imx6_pcie->apps_reset); > break; > case IMX6SX: > @@ -407,7 +413,8 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) > > static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie) > { > - WARN_ON(imx6_pcie->drvdata->variant != IMX8MQ); > + WARN_ON(imx6_pcie->drvdata->variant != IMX8MQ && > + imx6_pcie->drvdata->variant != IMX8MM); > return imx6_pcie->controller_id == 1 ? IOMUXC_GPR16 : IOMUXC_GPR14; > } > > @@ -447,6 +454,7 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) > case IMX7D: > break; > case IMX8MQ: > + case IMX8MM: > ret = clk_prepare_enable(imx6_pcie->pcie_aux); > if (ret) { > dev_err(dev, "unable to enable pcie_aux clock\n"); > @@ -522,6 +530,14 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) > goto err_ref_clk; > } > > + switch (imx6_pcie->drvdata->variant) { > + case IMX8MM: > + if (phy_power_on(imx6_pcie->phy)) > + pr_info("unable to enable pcie phy clock\n"); It a implementation detail of the PHY driver that this just turns on the clock. dev_err("unable to power on PHY\n") or something like that. > + break; > + default: > + break; > + } > /* allow the clocks to stabilize */ > usleep_range(200, 500); > > @@ -538,6 +554,10 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) > case IMX8MQ: > reset_control_deassert(imx6_pcie->pciephy_reset); > break; > + case IMX8MM: > + if (phy_init(imx6_pcie->phy) != 0) > + dev_err(dev, "Waiting for PHY ready timeout!\n"); > + break; > case IMX7D: > reset_control_deassert(imx6_pcie->pciephy_reset); > > @@ -614,6 +634,8 @@ static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie) > static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie) > { > switch (imx6_pcie->drvdata->variant) { > + case IMX8MM: > + break; > case IMX8MQ: > /* > * TODO: Currently this code assumes external > @@ -753,6 +775,7 @@ static void imx6_pcie_ltssm_enable(struct device *dev) > break; > case IMX7D: > case IMX8MQ: > + case IMX8MM: > reset_control_deassert(imx6_pcie->apps_reset); > break; > } > @@ -871,6 +894,7 @@ static void imx6_pcie_ltssm_disable(struct device *dev) > IMX6Q_GPR12_PCIE_CTL_2, 0); > break; > case IMX7D: > + case IMX8MM: > reset_control_assert(imx6_pcie->apps_reset); > break; > default: > @@ -930,6 +954,7 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie) > IMX7D_GPR12_PCIE_PHY_REFCLK_SEL); > break; > case IMX8MQ: > + case IMX8MM: > clk_disable_unprepare(imx6_pcie->pcie_aux); > break; > default: > @@ -985,6 +1010,7 @@ static int imx6_pcie_probe(struct platform_device *pdev) > struct imx6_pcie *imx6_pcie; > struct device_node *np; > struct resource *dbi_base; > + struct device_node *phy_node; > struct device_node *node = dev->of_node; > int ret; > u16 val; > @@ -1019,6 +1045,14 @@ static int imx6_pcie_probe(struct platform_device *pdev) > return PTR_ERR(imx6_pcie->phy_base); > } > > + imx6_pcie->phy = devm_phy_get(dev, "pcie-phy"); > + if (IS_ERR(imx6_pcie->phy)) { > + if (PTR_ERR(imx6_pcie->phy) == -EPROBE_DEFER) > + return -EPROBE_DEFER; > + /* Set NULL if there is no pcie-phy */ > + imx6_pcie->phy = NULL; > + } Move this into the i.MX8MM specific section below. The PHY is required on the 8MM and we should not ignore any errors. Regards, Lucas > + > dbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0); > pci->dbi_base = devm_ioremap_resource(dev, dbi_base); > if (IS_ERR(pci->dbi_base)) > @@ -1090,6 +1124,18 @@ static int imx6_pcie_probe(struct platform_device *pdev) > return PTR_ERR(imx6_pcie->apps_reset); > } > break; > + case IMX8MM: > + imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux"); > + if (IS_ERR(imx6_pcie->pcie_aux)) > + return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux), > + "pcie_aux clock source missing or invalid\n"); > + imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev, > + "apps"); > + if (IS_ERR(imx6_pcie->apps_reset)) { > + dev_err(dev, "Failed to get PCIE APPS reset control\n"); > + return PTR_ERR(imx6_pcie->apps_reset); > + } > + break; > default: > break; > } > @@ -1130,6 +1176,14 @@ static int imx6_pcie_probe(struct platform_device *pdev) > &imx6_pcie->tx_swing_low)) > imx6_pcie->tx_swing_low = 127; > > + /* get PHY refclk pad mode if there is PHY node */ > + phy_node = of_parse_phandle(node, "phys", 0); > + if (phy_node) { > + of_property_read_u32(phy_node, "fsl,refclk-pad-mode", > + &imx6_pcie->refclk_pad_mode); > + of_node_put(phy_node); > + } > + > /* Limit link speed */ > pci->link_gen = 1; > of_property_read_u32(node, "fsl,max-link-speed", &pci->link_gen); > @@ -1202,6 +1256,10 @@ static const struct imx6_pcie_drvdata drvdata[] = { > [IMX8MQ] = { > .variant = IMX8MQ, > }, > + [IMX8MM] = { > + .variant = IMX8MM, > + .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND, > + }, > }; > > static const struct of_device_id imx6_pcie_of_match[] = { > @@ -1209,7 +1267,8 @@ static const struct of_device_id imx6_pcie_of_match[] = { > { .compatible = "fsl,imx6sx-pcie", .data = &drvdata[IMX6SX], }, > { .compatible = "fsl,imx6qp-pcie", .data = &drvdata[IMX6QP], }, > { .compatible = "fsl,imx7d-pcie", .data = &drvdata[IMX7D], }, > - { .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], } , > + { .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], }, > + { .compatible = "fsl,imx8mm-pcie", .data = &drvdata[IMX8MM], }, > {}, > }; >
> -----Original Message----- > From: Lucas Stach <l.stach@pengutronix.de> > Sent: Saturday, October 16, 2021 3:00 AM > To: Richard Zhu <hongxing.zhu@nxp.com>; tharvey@gateworks.com; > kishon@ti.com; vkoul@kernel.org; robh@kernel.org; > galak@kernel.crashing.org; shawnguo@kernel.org > Cc: linux-phy@lists.infradead.org; devicetree@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 v3 9/9] PCI: imx: add the imx8mm pcie support > > Am Dienstag, dem 12.10.2021 um 16:41 +0800 schrieb Richard Zhu: > > i.MX8MM PCIe works mostly like the i.MX8MQ one, but has a different > > PHY and allows to output the internal PHY reference clock via the refclk > pad. > > Add the i.MX8MM PCIe support based on the standalone PHY driver. > > > > Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com> > > --- > > drivers/pci/controller/dwc/pci-imx6.c | 63 > > ++++++++++++++++++++++++++- > > 1 file changed, 61 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c > > b/drivers/pci/controller/dwc/pci-imx6.c > > index 26f49f797b0f..73022e37b1c5 100644 > > --- a/drivers/pci/controller/dwc/pci-imx6.c > > +++ b/drivers/pci/controller/dwc/pci-imx6.c > > @@ -29,6 +29,7 @@ > > #include <linux/types.h> > > #include <linux/interrupt.h> > > #include <linux/reset.h> > > +#include <linux/phy/phy.h> > > #include <linux/pm_domain.h> > > #include <linux/pm_runtime.h> > > > > @@ -49,6 +50,7 @@ enum imx6_pcie_variants { > > IMX6QP, > > IMX7D, > > IMX8MQ, > > + IMX8MM, > > }; > > > > #define IMX6_PCIE_FLAG_IMX6_PHY BIT(0) > > @@ -80,6 +82,7 @@ struct imx6_pcie { > > u32 tx_deemph_gen2_6db; > > u32 tx_swing_full; > > u32 tx_swing_low; > > + u32 refclk_pad_mode; > > As Matthias already noticed: drop this. [Richard Zhu] Got that, thanks. > > > struct regulator *vpcie; > > struct regulator *vph; > > void __iomem *phy_base; > > @@ -88,6 +91,7 @@ struct imx6_pcie { > > struct device *pd_pcie; > > /* power domain for pcie phy */ > > struct device *pd_pcie_phy; > > + struct phy *phy; > > const struct imx6_pcie_drvdata *drvdata; }; > > > > @@ -372,6 +376,8 @@ static void imx6_pcie_assert_core_reset(struct > imx6_pcie *imx6_pcie) > > case IMX7D: > > case IMX8MQ: > > reset_control_assert(imx6_pcie->pciephy_reset); > > + fallthrough; > > + case IMX8MM: > > reset_control_assert(imx6_pcie->apps_reset); > > break; > > case IMX6SX: > > @@ -407,7 +413,8 @@ static void imx6_pcie_assert_core_reset(struct > > imx6_pcie *imx6_pcie) > > > > static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie > > *imx6_pcie) { > > - WARN_ON(imx6_pcie->drvdata->variant != IMX8MQ); > > + WARN_ON(imx6_pcie->drvdata->variant != IMX8MQ && > > + imx6_pcie->drvdata->variant != IMX8MM); > > return imx6_pcie->controller_id == 1 ? IOMUXC_GPR16 : > IOMUXC_GPR14; > > } > > > > @@ -447,6 +454,7 @@ static int imx6_pcie_enable_ref_clk(struct > imx6_pcie *imx6_pcie) > > case IMX7D: > > break; > > case IMX8MQ: > > + case IMX8MM: > > ret = clk_prepare_enable(imx6_pcie->pcie_aux); > > if (ret) { > > dev_err(dev, "unable to enable pcie_aux clock\n"); @@ -522,6 > > +530,14 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie > *imx6_pcie) > > goto err_ref_clk; > > } > > > > + switch (imx6_pcie->drvdata->variant) { > > + case IMX8MM: > > + if (phy_power_on(imx6_pcie->phy)) > > + pr_info("unable to enable pcie phy clock\n"); > > It a implementation detail of the PHY driver that this just turns on the clock. > dev_err("unable to power on PHY\n") or something like that. [Richard Zhu] Okay. Thanks. > > > + break; > > + default: > > + break; > > + } > > /* allow the clocks to stabilize */ > > usleep_range(200, 500); > > > > @@ -538,6 +554,10 @@ static void imx6_pcie_deassert_core_reset(struct > imx6_pcie *imx6_pcie) > > case IMX8MQ: > > reset_control_deassert(imx6_pcie->pciephy_reset); > > break; > > + case IMX8MM: > > + if (phy_init(imx6_pcie->phy) != 0) > > + dev_err(dev, "Waiting for PHY ready timeout!\n"); > > + break; > > case IMX7D: > > reset_control_deassert(imx6_pcie->pciephy_reset); > > > > @@ -614,6 +634,8 @@ static void imx6_pcie_configure_type(struct > > imx6_pcie *imx6_pcie) static void imx6_pcie_init_phy(struct imx6_pcie > > *imx6_pcie) { > > switch (imx6_pcie->drvdata->variant) { > > + case IMX8MM: > > + break; > > case IMX8MQ: > > /* > > * TODO: Currently this code assumes external @@ -753,6 +775,7 > @@ > > static void imx6_pcie_ltssm_enable(struct device *dev) > > break; > > case IMX7D: > > case IMX8MQ: > > + case IMX8MM: > > reset_control_deassert(imx6_pcie->apps_reset); > > break; > > } > > @@ -871,6 +894,7 @@ static void imx6_pcie_ltssm_disable(struct device > *dev) > > IMX6Q_GPR12_PCIE_CTL_2, 0); > > break; > > case IMX7D: > > + case IMX8MM: > > reset_control_assert(imx6_pcie->apps_reset); > > break; > > default: > > @@ -930,6 +954,7 @@ static void imx6_pcie_clk_disable(struct imx6_pcie > *imx6_pcie) > > IMX7D_GPR12_PCIE_PHY_REFCLK_SEL); > > break; > > case IMX8MQ: > > + case IMX8MM: > > clk_disable_unprepare(imx6_pcie->pcie_aux); > > break; > > default: > > @@ -985,6 +1010,7 @@ static int imx6_pcie_probe(struct platform_device > *pdev) > > struct imx6_pcie *imx6_pcie; > > struct device_node *np; > > struct resource *dbi_base; > > + struct device_node *phy_node; > > struct device_node *node = dev->of_node; > > int ret; > > u16 val; > > @@ -1019,6 +1045,14 @@ static int imx6_pcie_probe(struct > platform_device *pdev) > > return PTR_ERR(imx6_pcie->phy_base); > > } > > > > + imx6_pcie->phy = devm_phy_get(dev, "pcie-phy"); > > + if (IS_ERR(imx6_pcie->phy)) { > > + if (PTR_ERR(imx6_pcie->phy) == -EPROBE_DEFER) > > + return -EPROBE_DEFER; > > + /* Set NULL if there is no pcie-phy */ > > + imx6_pcie->phy = NULL; > > + } > > Move this into the i.MX8MM specific section below. The PHY is required on > the 8MM and we should not ignore any errors. [Richard Zhu] Okay. Thanks. Best Regards Richard Zhu > > Regards, > Lucas > > > + > > dbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > pci->dbi_base = devm_ioremap_resource(dev, dbi_base); > > if (IS_ERR(pci->dbi_base)) > > @@ -1090,6 +1124,18 @@ static int imx6_pcie_probe(struct > platform_device *pdev) > > return PTR_ERR(imx6_pcie->apps_reset); > > } > > break; > > + case IMX8MM: > > + imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux"); > > + if (IS_ERR(imx6_pcie->pcie_aux)) > > + return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux), > > + "pcie_aux clock source missing or invalid\n"); > > + imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev, > > + "apps"); > > + if (IS_ERR(imx6_pcie->apps_reset)) { > > + dev_err(dev, "Failed to get PCIE APPS reset control\n"); > > + return PTR_ERR(imx6_pcie->apps_reset); > > + } > > + break; > > default: > > break; > > } > > @@ -1130,6 +1176,14 @@ static int imx6_pcie_probe(struct > platform_device *pdev) > > &imx6_pcie->tx_swing_low)) > > imx6_pcie->tx_swing_low = 127; > > > > + /* get PHY refclk pad mode if there is PHY node */ > > + phy_node = of_parse_phandle(node, "phys", 0); > > + if (phy_node) { > > + of_property_read_u32(phy_node, "fsl,refclk-pad-mode", > > + &imx6_pcie->refclk_pad_mode); > > + of_node_put(phy_node); > > + } > > + > > /* Limit link speed */ > > pci->link_gen = 1; > > of_property_read_u32(node, "fsl,max-link-speed", &pci->link_gen); @@ > > -1202,6 +1256,10 @@ static const struct imx6_pcie_drvdata drvdata[] = { > > [IMX8MQ] = { > > .variant = IMX8MQ, > > }, > > + [IMX8MM] = { > > + .variant = IMX8MM, > > + .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND, > > + }, > > }; > > > > static const struct of_device_id imx6_pcie_of_match[] = { @@ -1209,7 > > +1267,8 @@ static const struct of_device_id imx6_pcie_of_match[] = { > > { .compatible = "fsl,imx6sx-pcie", .data = &drvdata[IMX6SX], }, > > { .compatible = "fsl,imx6qp-pcie", .data = &drvdata[IMX6QP], }, > > { .compatible = "fsl,imx7d-pcie", .data = &drvdata[IMX7D], }, > > - { .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], } , > > + { .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], }, > > + { .compatible = "fsl,imx8mm-pcie", .data = &drvdata[IMX8MM], }, > > {}, > > }; > > >
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 26f49f797b0f..73022e37b1c5 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -29,6 +29,7 @@ #include <linux/types.h> #include <linux/interrupt.h> #include <linux/reset.h> +#include <linux/phy/phy.h> #include <linux/pm_domain.h> #include <linux/pm_runtime.h> @@ -49,6 +50,7 @@ enum imx6_pcie_variants { IMX6QP, IMX7D, IMX8MQ, + IMX8MM, }; #define IMX6_PCIE_FLAG_IMX6_PHY BIT(0) @@ -80,6 +82,7 @@ struct imx6_pcie { u32 tx_deemph_gen2_6db; u32 tx_swing_full; u32 tx_swing_low; + u32 refclk_pad_mode; struct regulator *vpcie; struct regulator *vph; void __iomem *phy_base; @@ -88,6 +91,7 @@ struct imx6_pcie { struct device *pd_pcie; /* power domain for pcie phy */ struct device *pd_pcie_phy; + struct phy *phy; const struct imx6_pcie_drvdata *drvdata; }; @@ -372,6 +376,8 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) case IMX7D: case IMX8MQ: reset_control_assert(imx6_pcie->pciephy_reset); + fallthrough; + case IMX8MM: reset_control_assert(imx6_pcie->apps_reset); break; case IMX6SX: @@ -407,7 +413,8 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie) { - WARN_ON(imx6_pcie->drvdata->variant != IMX8MQ); + WARN_ON(imx6_pcie->drvdata->variant != IMX8MQ && + imx6_pcie->drvdata->variant != IMX8MM); return imx6_pcie->controller_id == 1 ? IOMUXC_GPR16 : IOMUXC_GPR14; } @@ -447,6 +454,7 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) case IMX7D: break; case IMX8MQ: + case IMX8MM: ret = clk_prepare_enable(imx6_pcie->pcie_aux); if (ret) { dev_err(dev, "unable to enable pcie_aux clock\n"); @@ -522,6 +530,14 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) goto err_ref_clk; } + switch (imx6_pcie->drvdata->variant) { + case IMX8MM: + if (phy_power_on(imx6_pcie->phy)) + pr_info("unable to enable pcie phy clock\n"); + break; + default: + break; + } /* allow the clocks to stabilize */ usleep_range(200, 500); @@ -538,6 +554,10 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) case IMX8MQ: reset_control_deassert(imx6_pcie->pciephy_reset); break; + case IMX8MM: + if (phy_init(imx6_pcie->phy) != 0) + dev_err(dev, "Waiting for PHY ready timeout!\n"); + break; case IMX7D: reset_control_deassert(imx6_pcie->pciephy_reset); @@ -614,6 +634,8 @@ static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie) static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie) { switch (imx6_pcie->drvdata->variant) { + case IMX8MM: + break; case IMX8MQ: /* * TODO: Currently this code assumes external @@ -753,6 +775,7 @@ static void imx6_pcie_ltssm_enable(struct device *dev) break; case IMX7D: case IMX8MQ: + case IMX8MM: reset_control_deassert(imx6_pcie->apps_reset); break; } @@ -871,6 +894,7 @@ static void imx6_pcie_ltssm_disable(struct device *dev) IMX6Q_GPR12_PCIE_CTL_2, 0); break; case IMX7D: + case IMX8MM: reset_control_assert(imx6_pcie->apps_reset); break; default: @@ -930,6 +954,7 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie) IMX7D_GPR12_PCIE_PHY_REFCLK_SEL); break; case IMX8MQ: + case IMX8MM: clk_disable_unprepare(imx6_pcie->pcie_aux); break; default: @@ -985,6 +1010,7 @@ static int imx6_pcie_probe(struct platform_device *pdev) struct imx6_pcie *imx6_pcie; struct device_node *np; struct resource *dbi_base; + struct device_node *phy_node; struct device_node *node = dev->of_node; int ret; u16 val; @@ -1019,6 +1045,14 @@ static int imx6_pcie_probe(struct platform_device *pdev) return PTR_ERR(imx6_pcie->phy_base); } + imx6_pcie->phy = devm_phy_get(dev, "pcie-phy"); + if (IS_ERR(imx6_pcie->phy)) { + if (PTR_ERR(imx6_pcie->phy) == -EPROBE_DEFER) + return -EPROBE_DEFER; + /* Set NULL if there is no pcie-phy */ + imx6_pcie->phy = NULL; + } + dbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0); pci->dbi_base = devm_ioremap_resource(dev, dbi_base); if (IS_ERR(pci->dbi_base)) @@ -1090,6 +1124,18 @@ static int imx6_pcie_probe(struct platform_device *pdev) return PTR_ERR(imx6_pcie->apps_reset); } break; + case IMX8MM: + imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux"); + if (IS_ERR(imx6_pcie->pcie_aux)) + return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux), + "pcie_aux clock source missing or invalid\n"); + imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev, + "apps"); + if (IS_ERR(imx6_pcie->apps_reset)) { + dev_err(dev, "Failed to get PCIE APPS reset control\n"); + return PTR_ERR(imx6_pcie->apps_reset); + } + break; default: break; } @@ -1130,6 +1176,14 @@ static int imx6_pcie_probe(struct platform_device *pdev) &imx6_pcie->tx_swing_low)) imx6_pcie->tx_swing_low = 127; + /* get PHY refclk pad mode if there is PHY node */ + phy_node = of_parse_phandle(node, "phys", 0); + if (phy_node) { + of_property_read_u32(phy_node, "fsl,refclk-pad-mode", + &imx6_pcie->refclk_pad_mode); + of_node_put(phy_node); + } + /* Limit link speed */ pci->link_gen = 1; of_property_read_u32(node, "fsl,max-link-speed", &pci->link_gen); @@ -1202,6 +1256,10 @@ static const struct imx6_pcie_drvdata drvdata[] = { [IMX8MQ] = { .variant = IMX8MQ, }, + [IMX8MM] = { + .variant = IMX8MM, + .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND, + }, }; static const struct of_device_id imx6_pcie_of_match[] = { @@ -1209,7 +1267,8 @@ static const struct of_device_id imx6_pcie_of_match[] = { { .compatible = "fsl,imx6sx-pcie", .data = &drvdata[IMX6SX], }, { .compatible = "fsl,imx6qp-pcie", .data = &drvdata[IMX6QP], }, { .compatible = "fsl,imx7d-pcie", .data = &drvdata[IMX7D], }, - { .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], } , + { .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], }, + { .compatible = "fsl,imx8mm-pcie", .data = &drvdata[IMX8MM], }, {}, };
i.MX8MM PCIe works mostly like the i.MX8MQ one, but has a different PHY and allows to output the internal PHY reference clock via the refclk pad. Add the i.MX8MM PCIe support based on the standalone PHY driver. Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com> --- drivers/pci/controller/dwc/pci-imx6.c | 63 ++++++++++++++++++++++++++- 1 file changed, 61 insertions(+), 2 deletions(-)