| Message ID | 20170119163631.10668-4-andrew.smirnov@gmail.com |
|---|---|
| State | Changes Requested |
| Headers | show |
Am Donnerstag, den 19.01.2017, 08:36 -0800 schrieb Andrey Smirnov: > Add various bits of code needed to support i.MX7D variant of the IP. > > Cc: yurovsky@gmail.com > Cc: Richard Zhu <hongxing.zhu@nxp.com> > Cc: Lucas Stach <l.stach@pengutronix.de> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: Fabio Estevam <festevam@gmail.com> > Cc: Shawn Guo <shawnguo@kernel.org> > Cc: Rob Herring <robh+dt@kernel.org> > Cc: Mark Rutland <mark.rutland@arm.com> > Cc: Lee Jones <lee.jones@linaro.org> > Cc: linux-arm-kernel@lists.infradead.org > Cc: devicetree@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> > --- > .../devicetree/bindings/pci/fsl,imx6q-pcie.txt | 6 +- > drivers/pci/host/pci-imx6.c | 188 ++++++++++++++++++--- > include/linux/mfd/syscon/imx7-gpc.h | 18 ++ > include/linux/mfd/syscon/imx7-iomuxc-gpr.h | 4 + > include/linux/mfd/syscon/imx7-src.h | 18 ++ > 5 files changed, 208 insertions(+), 26 deletions(-) > create mode 100644 include/linux/mfd/syscon/imx7-gpc.h > create mode 100644 include/linux/mfd/syscon/imx7-src.h > > diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt > index 83aeb1f..20b9382 100644 > --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt > +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt > @@ -4,7 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP > and thus inherits all the common properties defined in designware-pcie.txt. > > Required properties: > -- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", "fsl,imx6qp-pcie" > +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", > + "fsl,imx6qp-pcie", "fsl,imx7d-pcie" > - reg: base address and length of the PCIe controller > - interrupts: A list of interrupt outputs of the controller. Must contain an > entry for each entry in the interrupt-names property. > @@ -34,6 +35,9 @@ Additional required properties for imx6sx-pcie: > - clock names: Must include the following additional entries: > - "pcie_inbound_axi" > > +Additional required properties for imx7d-pcie: > +- pcie-phy-supply: Should specify the regulator supplying PCIe PHY > + This isn't a PHY regulator, but a regulator powering the GPC domain where the PHY is located. This should not be handled in the PCIe driver. See the previous discussion with i.MX6SX, that is in the same boat. [...] > static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie) > { > - if (imx6_pcie->variant == IMX6SX) > + switch (imx6_pcie->variant) { > + case IMX7D: { > + int ret; > + unsigned int reg, mapping; > + struct pcie_port *pp = &imx6_pcie->pp; > + struct device *dev = pp->dev; > + > + regulator_set_voltage(imx6_pcie->pcie_phy_regulator, > + 1000000, 1000000); > + ret = regulator_enable(imx6_pcie->pcie_phy_regulator); > + if (ret) { > + dev_err(dev, "failed to enable pcie regulator.\n"); > + return; > + } > + > + /* > + * Now that PHY regulator is enabled, do sofware > + * power-up request by mapping PHY in A7 domain and > + * setting power-up request bit > + */ > + regmap_read(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, &mapping); > + regmap_write(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, > + mapping | IMX7D_PCIE_PHY_A7_DOMAIN); > + > + regmap_update_bits(imx6_pcie->gpc, GPC_PU_PGC_SW_PUP_REQ, > + IMX7D_PCIE_PHY_SW_PUP_REQ, > + IMX7D_PCIE_PHY_SW_PUP_REQ); > + /* > + * As per "5.5.9.4 Example Code 4" in IMX7DRM.pdf wait > + * for PUP_REQ bit to be cleared > + */ > + while (!regmap_read(imx6_pcie->gpc, > + GPC_PU_PGC_SW_PUP_REQ, ®) && > + reg & IMX7D_PCIE_PHY_SW_PUP_REQ) > + ; > + regmap_write(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, mapping); I won't allow code touching the GPC registers to sneak into the PCIe driver. I know this is the downstream solution, but this really needs a proper GPC power domain driver, instead of this hack. Regards, Lucas -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thu, Jan 19, 2017 at 8:52 AM, Lucas Stach <l.stach@pengutronix.de> wrote: > Am Donnerstag, den 19.01.2017, 08:36 -0800 schrieb Andrey Smirnov: >> Add various bits of code needed to support i.MX7D variant of the IP. >> >> Cc: yurovsky@gmail.com >> Cc: Richard Zhu <hongxing.zhu@nxp.com> >> Cc: Lucas Stach <l.stach@pengutronix.de> >> Cc: Bjorn Helgaas <bhelgaas@google.com> >> Cc: Fabio Estevam <festevam@gmail.com> >> Cc: Shawn Guo <shawnguo@kernel.org> >> Cc: Rob Herring <robh+dt@kernel.org> >> Cc: Mark Rutland <mark.rutland@arm.com> >> Cc: Lee Jones <lee.jones@linaro.org> >> Cc: linux-arm-kernel@lists.infradead.org >> Cc: devicetree@vger.kernel.org >> Cc: linux-kernel@vger.kernel.org >> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> >> --- >> .../devicetree/bindings/pci/fsl,imx6q-pcie.txt | 6 +- >> drivers/pci/host/pci-imx6.c | 188 ++++++++++++++++++--- >> include/linux/mfd/syscon/imx7-gpc.h | 18 ++ >> include/linux/mfd/syscon/imx7-iomuxc-gpr.h | 4 + >> include/linux/mfd/syscon/imx7-src.h | 18 ++ >> 5 files changed, 208 insertions(+), 26 deletions(-) >> create mode 100644 include/linux/mfd/syscon/imx7-gpc.h >> create mode 100644 include/linux/mfd/syscon/imx7-src.h >> >> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt >> index 83aeb1f..20b9382 100644 >> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt >> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt >> @@ -4,7 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP >> and thus inherits all the common properties defined in designware-pcie.txt. >> >> Required properties: >> -- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", "fsl,imx6qp-pcie" >> +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", >> + "fsl,imx6qp-pcie", "fsl,imx7d-pcie" >> - reg: base address and length of the PCIe controller >> - interrupts: A list of interrupt outputs of the controller. Must contain an >> entry for each entry in the interrupt-names property. >> @@ -34,6 +35,9 @@ Additional required properties for imx6sx-pcie: >> - clock names: Must include the following additional entries: >> - "pcie_inbound_axi" >> >> +Additional required properties for imx7d-pcie: >> +- pcie-phy-supply: Should specify the regulator supplying PCIe PHY >> + > This isn't a PHY regulator, but a regulator powering the GPC domain > where the PHY is located. This should not be handled in the PCIe driver. > See the previous discussion with i.MX6SX, that is in the same boat. > Good to know, thanks for clarification. > [...] >> static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie) >> { >> - if (imx6_pcie->variant == IMX6SX) >> + switch (imx6_pcie->variant) { >> + case IMX7D: { >> + int ret; >> + unsigned int reg, mapping; >> + struct pcie_port *pp = &imx6_pcie->pp; >> + struct device *dev = pp->dev; >> + >> + regulator_set_voltage(imx6_pcie->pcie_phy_regulator, >> + 1000000, 1000000); >> + ret = regulator_enable(imx6_pcie->pcie_phy_regulator); >> + if (ret) { >> + dev_err(dev, "failed to enable pcie regulator.\n"); >> + return; >> + } >> + >> + /* >> + * Now that PHY regulator is enabled, do sofware >> + * power-up request by mapping PHY in A7 domain and >> + * setting power-up request bit >> + */ >> + regmap_read(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, &mapping); >> + regmap_write(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, >> + mapping | IMX7D_PCIE_PHY_A7_DOMAIN); >> + >> + regmap_update_bits(imx6_pcie->gpc, GPC_PU_PGC_SW_PUP_REQ, >> + IMX7D_PCIE_PHY_SW_PUP_REQ, >> + IMX7D_PCIE_PHY_SW_PUP_REQ); >> + /* >> + * As per "5.5.9.4 Example Code 4" in IMX7DRM.pdf wait >> + * for PUP_REQ bit to be cleared >> + */ >> + while (!regmap_read(imx6_pcie->gpc, >> + GPC_PU_PGC_SW_PUP_REQ, ®) && >> + reg & IMX7D_PCIE_PHY_SW_PUP_REQ) >> + ; >> + regmap_write(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, mapping); > > I won't allow code touching the GPC registers to sneak into the PCIe > driver. I know this is the downstream solution, but this really needs a > proper GPC power domain driver, instead of this hack. > OK, will change in v2. > Regards, > Lucas > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thu, Jan 19, 2017 at 08:36:31AM -0800, Andrey Smirnov wrote: > Add various bits of code needed to support i.MX7D variant of the IP. > > Cc: yurovsky@gmail.com > Cc: Richard Zhu <hongxing.zhu@nxp.com> > Cc: Lucas Stach <l.stach@pengutronix.de> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: Fabio Estevam <festevam@gmail.com> > Cc: Shawn Guo <shawnguo@kernel.org> > Cc: Rob Herring <robh+dt@kernel.org> > Cc: Mark Rutland <mark.rutland@arm.com> > Cc: Lee Jones <lee.jones@linaro.org> > Cc: linux-arm-kernel@lists.infradead.org > Cc: devicetree@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> > --- > .../devicetree/bindings/pci/fsl,imx6q-pcie.txt | 6 +- > drivers/pci/host/pci-imx6.c | 188 ++++++++++++++++++--- > include/linux/mfd/syscon/imx7-gpc.h | 18 ++ > include/linux/mfd/syscon/imx7-iomuxc-gpr.h | 4 + > include/linux/mfd/syscon/imx7-src.h | 18 ++ > 5 files changed, 208 insertions(+), 26 deletions(-) > create mode 100644 include/linux/mfd/syscon/imx7-gpc.h > create mode 100644 include/linux/mfd/syscon/imx7-src.h > > diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt > index 83aeb1f..20b9382 100644 > --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt > +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt > @@ -4,7 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP > and thus inherits all the common properties defined in designware-pcie.txt. > > Required properties: > -- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", "fsl,imx6qp-pcie" > +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", > + "fsl,imx6qp-pcie", "fsl,imx7d-pcie" Please reformat to one valid combination per line. > - reg: base address and length of the PCIe controller > - interrupts: A list of interrupt outputs of the controller. Must contain an > entry for each entry in the interrupt-names property. > @@ -34,6 +35,9 @@ Additional required properties for imx6sx-pcie: > - clock names: Must include the following additional entries: > - "pcie_inbound_axi" > > +Additional required properties for imx7d-pcie: > +- pcie-phy-supply: Should specify the regulator supplying PCIe PHY > + > Example: > > pcie@0x01000000 { -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Mon, Jan 23, 2017 at 6:52 AM, Rob Herring <robh@kernel.org> wrote: > On Thu, Jan 19, 2017 at 08:36:31AM -0800, Andrey Smirnov wrote: >> Add various bits of code needed to support i.MX7D variant of the IP. >> >> Cc: yurovsky@gmail.com >> Cc: Richard Zhu <hongxing.zhu@nxp.com> >> Cc: Lucas Stach <l.stach@pengutronix.de> >> Cc: Bjorn Helgaas <bhelgaas@google.com> >> Cc: Fabio Estevam <festevam@gmail.com> >> Cc: Shawn Guo <shawnguo@kernel.org> >> Cc: Rob Herring <robh+dt@kernel.org> >> Cc: Mark Rutland <mark.rutland@arm.com> >> Cc: Lee Jones <lee.jones@linaro.org> >> Cc: linux-arm-kernel@lists.infradead.org >> Cc: devicetree@vger.kernel.org >> Cc: linux-kernel@vger.kernel.org >> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> >> --- >> .../devicetree/bindings/pci/fsl,imx6q-pcie.txt | 6 +- >> drivers/pci/host/pci-imx6.c | 188 ++++++++++++++++++--- >> include/linux/mfd/syscon/imx7-gpc.h | 18 ++ >> include/linux/mfd/syscon/imx7-iomuxc-gpr.h | 4 + >> include/linux/mfd/syscon/imx7-src.h | 18 ++ >> 5 files changed, 208 insertions(+), 26 deletions(-) >> create mode 100644 include/linux/mfd/syscon/imx7-gpc.h >> create mode 100644 include/linux/mfd/syscon/imx7-src.h >> >> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt >> index 83aeb1f..20b9382 100644 >> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt >> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt >> @@ -4,7 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP >> and thus inherits all the common properties defined in designware-pcie.txt. >> >> Required properties: >> -- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", "fsl,imx6qp-pcie" >> +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", >> + "fsl,imx6qp-pcie", "fsl,imx7d-pcie" > > Please reformat to one valid combination per line. Noted for v2, thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt index 83aeb1f..20b9382 100644 --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt @@ -4,7 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP and thus inherits all the common properties defined in designware-pcie.txt. Required properties: -- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", "fsl,imx6qp-pcie" +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", + "fsl,imx6qp-pcie", "fsl,imx7d-pcie" - reg: base address and length of the PCIe controller - interrupts: A list of interrupt outputs of the controller. Must contain an entry for each entry in the interrupt-names property. @@ -34,6 +35,9 @@ Additional required properties for imx6sx-pcie: - clock names: Must include the following additional entries: - "pcie_inbound_axi" +Additional required properties for imx7d-pcie: +- pcie-phy-supply: Should specify the regulator supplying PCIe PHY + Example: pcie@0x01000000 { diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c index 574f026..f29148e 100644 --- a/drivers/pci/host/pci-imx6.c +++ b/drivers/pci/host/pci-imx6.c @@ -17,6 +17,9 @@ #include <linux/kernel.h> #include <linux/mfd/syscon.h> #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> +#include <linux/mfd/syscon/imx7-iomuxc-gpr.h> +#include <linux/mfd/syscon/imx7-src.h> +#include <linux/mfd/syscon/imx7-gpc.h> #include <linux/module.h> #include <linux/of_gpio.h> #include <linux/of_device.h> @@ -27,6 +30,7 @@ #include <linux/signal.h> #include <linux/types.h> #include <linux/interrupt.h> +#include <linux/regulator/consumer.h> #include "pcie-designware.h" @@ -36,6 +40,7 @@ enum imx6_pcie_variants { IMX6Q, IMX6SX, IMX6QP, + IMX7D, }; struct imx6_pcie { @@ -47,6 +52,8 @@ struct imx6_pcie { struct clk *pcie_inbound_axi; struct clk *pcie; struct regmap *iomuxc_gpr; + struct regmap *src; + struct regmap *gpc; enum imx6_pcie_variants variant; u32 tx_deemph_gen1; u32 tx_deemph_gen2_3p5db; @@ -54,8 +61,14 @@ struct imx6_pcie { u32 tx_swing_full; u32 tx_swing_low; int link_gen; + struct regulator *pcie_phy_regulator; }; +/* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */ +#define PHY_PLL_LOCK_WAIT_MAX_RETRIES 2000 +#define PHY_PLL_LOCK_WAIT_USLEEP_MIN 50 +#define PHY_PLL_LOCK_WAIT_USLEEP_MAX 200 + /* PCIe Root Complex registers (memory-mapped) */ #define PCIE_RC_LCR 0x7c #define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1 0x1 @@ -251,6 +264,16 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) u32 val, gpr1, gpr12; switch (imx6_pcie->variant) { + case IMX7D: + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_G_RST, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_G_RST); + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_BTN, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_BTN); + break; case IMX6SX: regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_TEST_POWERDOWN, @@ -333,11 +356,33 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16); break; + case IMX7D: + break; } return ret; } +static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie) +{ + u32 val; + unsigned int retries; + struct pcie_port *pp = &imx6_pcie->pp; + struct device *dev = pp->dev; + + for (retries = 0; retries < PHY_PLL_LOCK_WAIT_MAX_RETRIES; retries++) { + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR22, &val); + + if (val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED) + return; + + usleep_range(PHY_PLL_LOCK_WAIT_USLEEP_MIN, + PHY_PLL_LOCK_WAIT_USLEEP_MAX); + } + + dev_err(dev, "PCIe PLL lock timeout\n"); +} + static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) { struct pcie_port *pp = &imx6_pcie->pp; @@ -381,6 +426,21 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) } switch (imx6_pcie->variant) { + case IMX7D: + /* wait for more than 10us to release phy g_rst and btnrst */ + udelay(10); + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIE_CTRL_APPS_EN, 0); + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_G_RST, 0); + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_BTN, 0); + + imx7d_pcie_wait_for_phy_pll_lock(imx6_pcie); + break; case IMX6SX: regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5, IMX6SX_GPR5_PCIE_BTNRST_RESET, 0); @@ -407,35 +467,80 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie) { - if (imx6_pcie->variant == IMX6SX) + switch (imx6_pcie->variant) { + case IMX7D: { + int ret; + unsigned int reg, mapping; + struct pcie_port *pp = &imx6_pcie->pp; + struct device *dev = pp->dev; + + regulator_set_voltage(imx6_pcie->pcie_phy_regulator, + 1000000, 1000000); + ret = regulator_enable(imx6_pcie->pcie_phy_regulator); + if (ret) { + dev_err(dev, "failed to enable pcie regulator.\n"); + return; + } + + /* + * Now that PHY regulator is enabled, do sofware + * power-up request by mapping PHY in A7 domain and + * setting power-up request bit + */ + regmap_read(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, &mapping); + regmap_write(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, + mapping | IMX7D_PCIE_PHY_A7_DOMAIN); + + regmap_update_bits(imx6_pcie->gpc, GPC_PU_PGC_SW_PUP_REQ, + IMX7D_PCIE_PHY_SW_PUP_REQ, + IMX7D_PCIE_PHY_SW_PUP_REQ); + /* + * As per "5.5.9.4 Example Code 4" in IMX7DRM.pdf wait + * for PUP_REQ bit to be cleared + */ + while (!regmap_read(imx6_pcie->gpc, + GPC_PU_PGC_SW_PUP_REQ, ®) && + reg & IMX7D_PCIE_PHY_SW_PUP_REQ) + ; + regmap_write(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, mapping); + + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, 0); + break; + } + case IMX6SX: regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_RX_EQ_MASK, IMX6SX_GPR12_PCIE_RX_EQ_2); + /* FALLTHROUGH */ + default: + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, - IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); + /* configure constant input signal to the pcie ctrl and phy */ + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6Q_GPR12_LOS_LEVEL, 9 << 4); + + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, + IMX6Q_GPR8_TX_DEEMPH_GEN1, + imx6_pcie->tx_deemph_gen1 << 0); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, + IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB, + imx6_pcie->tx_deemph_gen2_3p5db << 6); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, + IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB, + imx6_pcie->tx_deemph_gen2_6db << 12); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, + IMX6Q_GPR8_TX_SWING_FULL, + imx6_pcie->tx_swing_full << 18); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, + IMX6Q_GPR8_TX_SWING_LOW, + imx6_pcie->tx_swing_low << 25); + break; + } - /* configure constant input signal to the pcie ctrl and phy */ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6Q_GPR12_DEVICE_TYPE, PCI_EXP_TYPE_ROOT_PORT << 12); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, - IMX6Q_GPR12_LOS_LEVEL, 9 << 4); - - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, - IMX6Q_GPR8_TX_DEEMPH_GEN1, - imx6_pcie->tx_deemph_gen1 << 0); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, - IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB, - imx6_pcie->tx_deemph_gen2_3p5db << 6); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, - IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB, - imx6_pcie->tx_deemph_gen2_6db << 12); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, - IMX6Q_GPR8_TX_SWING_FULL, - imx6_pcie->tx_swing_full << 18); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, - IMX6Q_GPR8_TX_SWING_LOW, - imx6_pcie->tx_swing_low << 25); } static int imx6_pcie_wait_for_link(struct imx6_pcie *imx6_pcie) @@ -498,8 +603,14 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie) dw_pcie_writel_rc(pp, PCIE_RC_LCR, tmp); /* Start LTSSM. */ - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, - IMX6Q_GPR12_PCIE_CTL_2, 1 << 10); + if (imx6_pcie->variant == IMX7D) + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIE_CTRL_APPS_EN, + IMX7D_SRC_PCIEPHY_RCR_PCIE_CTRL_APPS_EN); + else + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6Q_GPR12_PCIE_CTL_2, 1 << 10); ret = imx6_pcie_wait_for_link(imx6_pcie); if (ret) { @@ -677,13 +788,39 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) return PTR_ERR(imx6_pcie->pcie); } - if (imx6_pcie->variant == IMX6SX) { + switch (imx6_pcie->variant) { + case IMX6SX: imx6_pcie->pcie_inbound_axi = devm_clk_get(dev, "pcie_inbound_axi"); if (IS_ERR(imx6_pcie->pcie_inbound_axi)) { dev_err(dev, "pcie_inbound_axi clock missing or invalid\n"); return PTR_ERR(imx6_pcie->pcie_inbound_axi); } + break; + case IMX7D: + imx6_pcie->src = + syscon_regmap_lookup_by_compatible("fsl,imx7d-src"); + if (IS_ERR(imx6_pcie->src)) { + dev_err(dev, "imx7d pcie phy src missing or invalid\n"); + return PTR_ERR(imx6_pcie->src); + } + + imx6_pcie->gpc = + syscon_regmap_lookup_by_compatible("fsl,imx7d-gpc"); + if (IS_ERR(imx6_pcie->gpc)) { + dev_err(dev, "unable to find gpc registers\n"); + return PTR_ERR(imx6_pcie->gpc); + } + + imx6_pcie->pcie_phy_regulator = devm_regulator_get(pp->dev, + "pcie-phy"); + if (IS_ERR(imx6_pcie->pcie_phy_regulator)) { + dev_err(dev, "imx7d pcie phy src missing or invalid\n"); + return PTR_ERR(imx6_pcie->pcie_phy_regulator); + } + break; + default: + break; } /* Grab GPR config register range */ @@ -741,6 +878,7 @@ static const struct of_device_id imx6_pcie_of_match[] = { { .compatible = "fsl,imx6q-pcie", .data = (void *)IMX6Q, }, { .compatible = "fsl,imx6sx-pcie", .data = (void *)IMX6SX, }, { .compatible = "fsl,imx6qp-pcie", .data = (void *)IMX6QP, }, + { .compatible = "fsl,imx7d-pcie", .data = (void *)IMX7D, }, {}, }; diff --git a/include/linux/mfd/syscon/imx7-gpc.h b/include/linux/mfd/syscon/imx7-gpc.h new file mode 100644 index 0000000..38e1c9a9 --- /dev/null +++ b/include/linux/mfd/syscon/imx7-gpc.h @@ -0,0 +1,18 @@ +/* + * Copyright (C) 2017 Impinj + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __LINUX_IMX7_GPC_H +#define __LINUX_IMX7_GPC_H + +#define GPC_PGC_CPU_MAPPING 0xec +#define GPC_PU_PGC_SW_PUP_REQ 0xf8 + +#define IMX7D_PCIE_PHY_A7_DOMAIN BIT(3) +#define IMX7D_PCIE_PHY_SW_PUP_REQ BIT(1) + +#endif diff --git a/include/linux/mfd/syscon/imx7-iomuxc-gpr.h b/include/linux/mfd/syscon/imx7-iomuxc-gpr.h index 4585d61..abbd524 100644 --- a/include/linux/mfd/syscon/imx7-iomuxc-gpr.h +++ b/include/linux/mfd/syscon/imx7-iomuxc-gpr.h @@ -44,4 +44,8 @@ #define IMX7D_GPR5_CSI_MUX_CONTROL_MIPI (0x1 << 4) +#define IMX7D_GPR12_PCIE_PHY_REFCLK_SEL BIT(5) + +#define IMX7D_GPR22_PCIE_PHY_PLL_LOCKED BIT(31) + #endif /* __LINUX_IMX7_IOMUXC_GPR_H */ diff --git a/include/linux/mfd/syscon/imx7-src.h b/include/linux/mfd/syscon/imx7-src.h new file mode 100644 index 0000000..fdc4806 --- /dev/null +++ b/include/linux/mfd/syscon/imx7-src.h @@ -0,0 +1,18 @@ +/* + * Copyright (C) 2017 Impinj + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __LINUX_IMX7_SRC_H +#define __LINUX_IMX7_SRC_H + +#define SRC_PCIEPHY_RCR 0x2c + +#define IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_G_RST BIT(1) +#define IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_BTN BIT(2) +#define IMX7D_SRC_PCIEPHY_RCR_PCIE_CTRL_APPS_EN BIT(6) + +#endif /* __LINUX_IMX7_IOMUXC_GPR_H */
Add various bits of code needed to support i.MX7D variant of the IP. Cc: yurovsky@gmail.com Cc: Richard Zhu <hongxing.zhu@nxp.com> Cc: Lucas Stach <l.stach@pengutronix.de> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Fabio Estevam <festevam@gmail.com> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Rob Herring <robh+dt@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Lee Jones <lee.jones@linaro.org> Cc: linux-arm-kernel@lists.infradead.org Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> --- .../devicetree/bindings/pci/fsl,imx6q-pcie.txt | 6 +- drivers/pci/host/pci-imx6.c | 188 ++++++++++++++++++--- include/linux/mfd/syscon/imx7-gpc.h | 18 ++ include/linux/mfd/syscon/imx7-iomuxc-gpr.h | 4 + include/linux/mfd/syscon/imx7-src.h | 18 ++ 5 files changed, 208 insertions(+), 26 deletions(-) create mode 100644 include/linux/mfd/syscon/imx7-gpc.h create mode 100644 include/linux/mfd/syscon/imx7-src.h