Messages in this thread | | | Subject | Re: [PATCH V2 14/16] phy: tegra: Add PCIe PIPE2UPHY support | From | Vidya Sagar <> | Date | Tue, 16 Apr 2019 23:44:18 +0530 |
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On 4/15/2019 9:01 PM, Thierry Reding wrote: > On Fri, Apr 05, 2019 at 01:24:41AM +0530, Vidya Sagar wrote: >> Synopsys DesignWare core based PCIe controllers in Tegra 194 SoC interface >> with Universal PHY (UPHY) module through a PIPE2UPHY (P2U) module. >> For each PCIe lane of a controller, there is a P2U unit instantiated at >> hardware level. This driver provides support for the programming required >> for each P2U that is going to be used for a PCIe controller. >> >> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> >> --- >> Changes since [v1]: >> * Added COMPILE_TEST in Kconfig >> * Removed empty phy_ops implementations >> * Modified code according to DT documentation file modifications >> >> drivers/phy/tegra/Kconfig | 7 ++ >> drivers/phy/tegra/Makefile | 1 + >> drivers/phy/tegra/pcie-p2u-tegra194.c | 120 ++++++++++++++++++++++++++++++++++ >> 3 files changed, 128 insertions(+) >> create mode 100644 drivers/phy/tegra/pcie-p2u-tegra194.c >> >> diff --git a/drivers/phy/tegra/Kconfig b/drivers/phy/tegra/Kconfig >> index a3b1de953fb7..eb93ee72ecf0 100644 >> --- a/drivers/phy/tegra/Kconfig >> +++ b/drivers/phy/tegra/Kconfig >> @@ -6,3 +6,10 @@ config PHY_TEGRA_XUSB >> >> To compile this driver as a module, choose M here: the module will >> be called phy-tegra-xusb. >> + >> +config PHY_TEGRA194_PCIE_P2U >> + tristate "NVIDIA Tegra P2U PHY Driver" >> + depends on ARCH_TEGRA || COMPILE_TEST >> + select GENERIC_PHY >> + help >> + Enable this to support the P2U (PIPE to UPHY) that is part of Tegra 19x SOCs. > > This should be using tabs for indentation. Done.
> >> diff --git a/drivers/phy/tegra/Makefile b/drivers/phy/tegra/Makefile >> index 898589238fd9..f85b2c86643d 100644 >> --- a/drivers/phy/tegra/Makefile >> +++ b/drivers/phy/tegra/Makefile >> @@ -4,3 +4,4 @@ phy-tegra-xusb-y += xusb.o >> phy-tegra-xusb-$(CONFIG_ARCH_TEGRA_124_SOC) += xusb-tegra124.o >> phy-tegra-xusb-$(CONFIG_ARCH_TEGRA_132_SOC) += xusb-tegra124.o >> phy-tegra-xusb-$(CONFIG_ARCH_TEGRA_210_SOC) += xusb-tegra210.o >> +obj-$(CONFIG_PHY_TEGRA194_PCIE_P2U) += pcie-p2u-tegra194.o >> diff --git a/drivers/phy/tegra/pcie-p2u-tegra194.c b/drivers/phy/tegra/pcie-p2u-tegra194.c >> new file mode 100644 >> index 000000000000..d4df8bfa9979 >> --- /dev/null >> +++ b/drivers/phy/tegra/pcie-p2u-tegra194.c >> @@ -0,0 +1,120 @@ >> +// SPDX-License-Identifier: GPL-2.0+ >> +/* >> + * P2U (PIPE to UPHY) driver for Tegra T194 SoC >> + * >> + * Copyright (C) 2019 NVIDIA Corporation. >> + * >> + * Author: Vidya Sagar <vidyas@nvidia.com> >> + */ >> + >> +#include <linux/module.h> >> +#include <linux/platform_device.h> >> +#include <linux/phy/phy.h> >> +#include <linux/of.h> >> +#include <linux/err.h> >> +#include <linux/io.h> >> +#include <linux/interrupt.h> >> +#include <linux/delay.h> >> +#include <linux/of_platform.h> >> +#include <soc/tegra/bpmp-abi.h> > > It's a good idea to keep these sorted alphabetically. That makes it a > lot easier to insert new ones in the right place subsequently. Done.
> >> + >> +#define P2U_PERIODIC_EQ_CTRL_GEN3 0xc0 >> +#define P2U_PERIODIC_EQ_CTRL_GEN3_PERIODIC_EQ_EN BIT(0) >> +#define P2U_PERIODIC_EQ_CTRL_GEN3_INIT_PRESET_EQ_TRAIN_EN BIT(1) >> +#define P2U_PERIODIC_EQ_CTRL_GEN4 0xc4 >> +#define P2U_PERIODIC_EQ_CTRL_GEN4_INIT_PRESET_EQ_TRAIN_EN BIT(1) >> + >> +#define P2U_RX_DEBOUNCE_TIME 0xa4 >> +#define P2U_RX_DEBOUNCE_TIME_DEBOUNCE_TIMER_MASK 0xFFFF > > Use consistent case for hexadecimal. All other register definitions use > lower-case, so this one should, too. > >> +#define P2U_RX_DEBOUNCE_TIME_DEBOUNCE_TIMER_VAL 160 >> + >> +struct tegra_p2u { >> + void __iomem *base; > > I personally wouldn't bother with the extra padding. A single space is > enough and avoid extra churn if you ever add something here that doesn't > fit into the existing padding space. Done.
> >> +}; >> + >> +static int tegra_p2u_power_on(struct phy *x) >> +{ >> + u32 val; >> + struct tegra_p2u *phy = phy_get_drvdata(x); > > It's often common to structure these as "reverse christmas tree" so that > the longest lines go first, followed by shorter lines. Not sure if > Kishon cares, though. Done. Took care of this in pcie-tegra194.c as well.
> >> + >> + val = readl(phy->base + P2U_PERIODIC_EQ_CTRL_GEN3); >> + val &= ~P2U_PERIODIC_EQ_CTRL_GEN3_PERIODIC_EQ_EN; >> + val |= P2U_PERIODIC_EQ_CTRL_GEN3_INIT_PRESET_EQ_TRAIN_EN; >> + writel(val, phy->base + P2U_PERIODIC_EQ_CTRL_GEN3); >> + >> + val = readl(phy->base + P2U_PERIODIC_EQ_CTRL_GEN4); >> + val |= P2U_PERIODIC_EQ_CTRL_GEN4_INIT_PRESET_EQ_TRAIN_EN; >> + writel(val, phy->base + P2U_PERIODIC_EQ_CTRL_GEN4); >> + >> + val = readl(phy->base + P2U_RX_DEBOUNCE_TIME); >> + val &= ~P2U_RX_DEBOUNCE_TIME_DEBOUNCE_TIMER_MASK; >> + val |= P2U_RX_DEBOUNCE_TIME_DEBOUNCE_TIMER_VAL; >> + writel(val, phy->base + P2U_RX_DEBOUNCE_TIME); >> + >> + return 0; >> +} >> + >> +static const struct phy_ops ops = { >> + .power_on = tegra_p2u_power_on, >> + .owner = THIS_MODULE, >> +}; >> + >> +static int tegra_p2u_probe(struct platform_device *pdev) >> +{ >> + struct tegra_p2u *phy; >> + struct phy *generic_phy; >> + struct phy_provider *phy_provider; >> + struct device *dev = &pdev->dev; >> + struct resource *res; >> + >> + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); >> + if (!phy) >> + return -ENOMEM; >> + >> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctl"); >> + phy->base = devm_ioremap_resource(dev, res); >> + if (IS_ERR(phy->base)) >> + return PTR_ERR_OR_ZERO(phy->base); >> + >> + platform_set_drvdata(pdev, phy); >> + >> + generic_phy = devm_phy_create(dev, NULL, &ops); >> + if (IS_ERR(generic_phy)) >> + return PTR_ERR_OR_ZERO(generic_phy); >> + >> + phy_set_drvdata(generic_phy, phy); >> + >> + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); >> + if (IS_ERR(phy_provider)) >> + return PTR_ERR_OR_ZERO(phy_provider); >> + >> + return 0; >> +} >> + >> +static int tegra_p2u_remove(struct platform_device *pdev) >> +{ >> + return 0; >> +} > > I think you can drop this. I want to make this as a loadable module hence i kep t .remove() implementation.
> >> + >> +static const struct of_device_id tegra_p2u_id_table[] = { >> + { >> + .compatible = "nvidia,tegra194-p2u", >> + }, >> + {} >> +}; >> +MODULE_DEVICE_TABLE(of, tegra_p2u_id_table); >> + >> +static struct platform_driver tegra_p2u_driver = { >> + .probe = tegra_p2u_probe, >> + .remove = tegra_p2u_remove, >> + .driver = { >> + .name = "tegra194-p2u", >> + .of_match_table = tegra_p2u_id_table, >> + }, >> +}; >> + >> +module_platform_driver(tegra_p2u_driver); >> + >> +MODULE_AUTHOR("Vidya Sagar <vidyas@nvidia.com>"); >> +MODULE_DESCRIPTION("NVIDIA Tegra PIPE_To_UPHY phy driver"); > > The driver description is somewhat odd here. Perhaps something like: > > "NVIDIA Tegra PIPE to UPHY PHY driver" > > ? Done.
> > Thierry > >> +MODULE_LICENSE("GPL v2"); >> -- >> 2.7.4 >>
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