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Date: Tue, 27 Sep 2022 11:29:32 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Thierry Reding <thierry.reding@...il.com>,
"David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>
Cc: Jon Hunter <jonathanh@...dia.com>,
Bhadram Varka <vbhadram@...dia.com>,
linux-tegra@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v4 RESEND] stmmac: tegra: Add MGBE support
On Fri, 2022-09-23 at 13:49 +0200, Thierry Reding wrote:
> From: Bhadram Varka <vbhadram@...dia.com>
>
> Add support for the Multi-Gigabit Ethernet (MGBE/XPCS) IP found on
> NVIDIA Tegra234 SoCs.
>
> Signed-off-by: Bhadram Varka <vbhadram@...dia.com>
> Signed-off-by: Thierry Reding <treding@...dia.com>
> ---
> drivers/net/ethernet/stmicro/stmmac/Kconfig | 6 +
> drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
> .../net/ethernet/stmicro/stmmac/dwmac-tegra.c | 290 ++++++++++++++++++
> 3 files changed, 297 insertions(+)
> create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-tegra.c
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> index 31ff35174034..e9f61bdaf7c4 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> @@ -235,6 +235,12 @@ config DWMAC_INTEL_PLAT
> the stmmac device driver. This driver is used for the Intel Keem Bay
> SoC.
>
> +config DWMAC_TEGRA
> + tristate "NVIDIA Tegra MGBE support"
> + depends on ARCH_TEGRA || COMPILE_TEST
> + help
> + Support for the MGBE controller found on Tegra SoCs.
> +
> config DWMAC_VISCONTI
> tristate "Toshiba Visconti DWMAC support"
> default ARCH_VISCONTI
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
> index d4e12e9ace4f..057e4bab5c08 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Makefile
> +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
> @@ -31,6 +31,7 @@ obj-$(CONFIG_DWMAC_DWC_QOS_ETH) += dwmac-dwc-qos-eth.o
> obj-$(CONFIG_DWMAC_INTEL_PLAT) += dwmac-intel-plat.o
> obj-$(CONFIG_DWMAC_GENERIC) += dwmac-generic.o
> obj-$(CONFIG_DWMAC_IMX8) += dwmac-imx.o
> +obj-$(CONFIG_DWMAC_TEGRA) += dwmac-tegra.o
> obj-$(CONFIG_DWMAC_VISCONTI) += dwmac-visconti.o
> stmmac-platform-objs:= stmmac_platform.o
> dwmac-altr-socfpga-objs := altr_tse_pcs.o dwmac-socfpga.o
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-tegra.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-tegra.c
> new file mode 100644
> index 000000000000..bb4b540820fa
> --- /dev/null
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-tegra.c
> @@ -0,0 +1,290 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +#include <linux/platform_device.h>
> +#include <linux/of_device.h>
> +#include <linux/module.h>
> +#include <linux/stmmac.h>
> +#include <linux/clk.h>
> +
> +#include "stmmac_platform.h"
> +
> +static const char *const mgbe_clks[] = {
> + "rx-pcs", "tx", "tx-pcs", "mac-divider", "mac", "mgbe", "ptp-ref", "mac"
> +};
> +
> +struct tegra_mgbe {
> + struct device *dev;
> +
> + struct clk_bulk_data *clks;
> +
> + struct reset_control *rst_mac;
> + struct reset_control *rst_pcs;
> +
> + void __iomem *hv;
> + void __iomem *regs;
> + void __iomem *xpcs;
> +
> + struct mii_bus *mii;
> +};
> +
> +#define XPCS_WRAP_UPHY_RX_CONTROL 0x801c
> +#define XPCS_WRAP_UPHY_RX_CONTROL_RX_SW_OVRD BIT(31)
> +#define XPCS_WRAP_UPHY_RX_CONTROL_RX_PCS_PHY_RDY BIT(10)
> +#define XPCS_WRAP_UPHY_RX_CONTROL_RX_CDR_RESET BIT(9)
> +#define XPCS_WRAP_UPHY_RX_CONTROL_RX_CAL_EN BIT(8)
> +#define XPCS_WRAP_UPHY_RX_CONTROL_RX_SLEEP (BIT(7) | BIT(6))
> +#define XPCS_WRAP_UPHY_RX_CONTROL_AUX_RX_IDDQ BIT(5)
> +#define XPCS_WRAP_UPHY_RX_CONTROL_RX_IDDQ BIT(4)
> +#define XPCS_WRAP_UPHY_RX_CONTROL_RX_DATA_EN BIT(0)
> +#define XPCS_WRAP_UPHY_HW_INIT_CTRL 0x8020
> +#define XPCS_WRAP_UPHY_HW_INIT_CTRL_TX_EN BIT(0)
> +#define XPCS_WRAP_UPHY_HW_INIT_CTRL_RX_EN BIT(2)
> +#define XPCS_WRAP_UPHY_STATUS 0x8044
> +#define XPCS_WRAP_UPHY_STATUS_TX_P_UP BIT(0)
> +#define XPCS_WRAP_IRQ_STATUS 0x8050
> +#define XPCS_WRAP_IRQ_STATUS_PCS_LINK_STS BIT(6)
> +
> +#define XPCS_REG_ADDR_SHIFT 10
> +#define XPCS_REG_ADDR_MASK 0x1fff
> +#define XPCS_ADDR 0x3fc
> +
> +#define MGBE_WRAP_COMMON_INTR_ENABLE 0x8704
> +#define MAC_SBD_INTR BIT(2)
> +#define MGBE_WRAP_AXI_ASID0_CTRL 0x8400
> +#define MGBE_SID 0x6
> +
> +static void mgbe_uphy_lane_bringup(struct tegra_mgbe *mgbe)
> +{
> + unsigned int retry = 300;
> + u32 value;
> + int err;
> +
> + value = readl(mgbe->xpcs + XPCS_WRAP_UPHY_STATUS);
> + if ((value & XPCS_WRAP_UPHY_STATUS_TX_P_UP) == 0) {
> + value = readl(mgbe->xpcs + XPCS_WRAP_UPHY_HW_INIT_CTRL);
> + value |= XPCS_WRAP_UPHY_HW_INIT_CTRL_TX_EN;
> + writel(value, mgbe->xpcs + XPCS_WRAP_UPHY_HW_INIT_CTRL);
> + }
> +
> + err = readl_poll_timeout(mgbe->xpcs + XPCS_WRAP_UPHY_HW_INIT_CTRL, value,
> + (value & XPCS_WRAP_UPHY_HW_INIT_CTRL_TX_EN) == 0,
> + 500, 500 * 2000);
> + if (err < 0)
> + dev_err(mgbe->dev, "timeout waiting for TX lane to become enabled\n");
Why you don't need to propagate this error to the caller?
Same question for more error cases below.
> +
> + usleep_range(10000, 20000);
> +
> + value = readl(mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> + value |= XPCS_WRAP_UPHY_RX_CONTROL_RX_SW_OVRD;
> + writel(value, mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> +
> + value = readl(mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> + value &= ~XPCS_WRAP_UPHY_RX_CONTROL_RX_IDDQ;
> + writel(value, mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> +
> + value = readl(mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> + value &= ~XPCS_WRAP_UPHY_RX_CONTROL_AUX_RX_IDDQ;
> + writel(value, mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> +
> + value = readl(mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> + value &= ~XPCS_WRAP_UPHY_RX_CONTROL_RX_SLEEP;
> + writel(value, mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> +
> + value = readl(mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> + value |= XPCS_WRAP_UPHY_RX_CONTROL_RX_CAL_EN;
> + writel(value, mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> +
> + err = readl_poll_timeout(mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL, value,
> + (value & XPCS_WRAP_UPHY_RX_CONTROL_RX_CAL_EN) == 0,
> + 1000, 1000 * 2000);
> + if (err < 0)
> + dev_err(mgbe->dev, "timeout waiting for RX calibration to become enabled\n");
> +
> + value = readl(mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> + value |= XPCS_WRAP_UPHY_RX_CONTROL_RX_DATA_EN;
> + writel(value, mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> +
> + value = readl(mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> + value |= XPCS_WRAP_UPHY_RX_CONTROL_RX_CDR_RESET;
> + writel(value, mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> +
> + value = readl(mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> + value &= ~XPCS_WRAP_UPHY_RX_CONTROL_RX_CDR_RESET;
> + writel(value, mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> +
> + value = readl(mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> + value |= XPCS_WRAP_UPHY_RX_CONTROL_RX_PCS_PHY_RDY;
> + writel(value, mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
> +
> + while (--retry) {
> + err = readl_poll_timeout(mgbe->xpcs + XPCS_WRAP_IRQ_STATUS, value,
> + value & XPCS_WRAP_IRQ_STATUS_PCS_LINK_STS,
> + 500, 500 * 2000);
> + if (err < 0) {
> + dev_err(mgbe->dev, "timeout waiting for link to become ready\n");
> + usleep_range(10000, 20000);
> + continue;
> + }
> + break;
> + }
It looks like the above loop can take up to 150 seconds (300
iterations, 500000usec each), can it be shortned?
> +
> + /* clear status */
> + writel(value, mgbe->xpcs + XPCS_WRAP_IRQ_STATUS);
> +}
> +
> +static int tegra_mgbe_probe(struct platform_device *pdev)
> +{
> + struct plat_stmmacenet_data *plat;
> + struct stmmac_resources res;
> + struct tegra_mgbe *mgbe;
> + int irq, err, i;
> +
> + mgbe = devm_kzalloc(&pdev->dev, sizeof(*mgbe), GFP_KERNEL);
> + if (!mgbe)
> + return -ENOMEM;
> +
> + mgbe->dev = &pdev->dev;
> +
> + memset(&res, 0, sizeof(res));
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + mgbe->hv = devm_platform_ioremap_resource_byname(pdev, "hypervisor");
> + if (IS_ERR(mgbe->hv))
> + return PTR_ERR(mgbe->hv);
> +
> + mgbe->regs = devm_platform_ioremap_resource_byname(pdev, "mac");
> + if (IS_ERR(mgbe->regs))
> + return PTR_ERR(mgbe->regs);
> +
> + mgbe->xpcs = devm_platform_ioremap_resource_byname(pdev, "xpcs");
> + if (IS_ERR(mgbe->xpcs))
> + return PTR_ERR(mgbe->xpcs);
> +
> + res.addr = mgbe->regs;
> + res.irq = irq;
> +
> + mgbe->clks = devm_kzalloc(&pdev->dev, sizeof(*mgbe->clks), GFP_KERNEL);
> + if (!mgbe->clks)
> + return -ENOMEM;
> +
> + for (i = 0; i < ARRAY_SIZE(mgbe_clks); i++)
> + mgbe->clks[i].id = mgbe_clks[i];
> +
> + err = devm_clk_bulk_get(mgbe->dev, ARRAY_SIZE(mgbe_clks), mgbe->clks);
> + if (err < 0)
> + return err;
> +
> + err = clk_bulk_prepare_enable(ARRAY_SIZE(mgbe_clks), mgbe->clks);
> + if (err < 0)
> + return err;
> +
> + /* Perform MAC reset */
> + mgbe->rst_mac = devm_reset_control_get(&pdev->dev, "mac");
> + if (IS_ERR(mgbe->rst_mac))
> + return PTR_ERR(mgbe->rst_mac);
> +
> + err = reset_control_assert(mgbe->rst_mac);
> + if (err < 0)
> + return err;
> +
> + usleep_range(2000, 4000);
> +
> + err = reset_control_deassert(mgbe->rst_mac);
> + if (err < 0)
> + return err;
> +
> + /* Perform PCS reset */
> + mgbe->rst_pcs = devm_reset_control_get(&pdev->dev, "pcs");
> + if (IS_ERR(mgbe->rst_pcs))
> + return PTR_ERR(mgbe->rst_pcs);
> +
> + err = reset_control_assert(mgbe->rst_pcs);
> + if (err < 0)
> + return err;
> +
> + usleep_range(2000, 4000);
> +
> + err = reset_control_deassert(mgbe->rst_pcs);
> + if (err < 0)
> + return err;
> +
> + plat = stmmac_probe_config_dt(pdev, res.mac);
> + if (IS_ERR(plat))
> + return PTR_ERR(plat);
> +
> + plat->has_xgmac = 1;
> + plat->tso_en = 1;
> + plat->pmt = 1;
> + plat->bsp_priv = mgbe;
> +
> + if (!plat->mdio_node)
> + plat->mdio_node = of_get_child_by_name(pdev->dev.of_node, "mdio");
> +
> + if (!plat->mdio_bus_data) {
> + plat->mdio_bus_data = devm_kzalloc(&pdev->dev, sizeof(*plat->mdio_bus_data),
> + GFP_KERNEL);
> + if (!plat->mdio_bus_data) {
> + err = -ENOMEM;
> + goto remove;
> + }
> + }
> +
> + plat->mdio_bus_data->needs_reset = true;
> +
> + mgbe_uphy_lane_bringup(mgbe);
> +
> + /* Tx FIFO Size - 128KB */
> + plat->tx_fifo_size = 131072;
> + /* Rx FIFO Size - 192KB */
> + plat->rx_fifo_size = 196608;
> +
> + /* Enable common interrupt at wrapper level */
> + writel(MAC_SBD_INTR, mgbe->regs + MGBE_WRAP_COMMON_INTR_ENABLE);
> +
> + /* Program SID */
> + writel(MGBE_SID, mgbe->hv + MGBE_WRAP_AXI_ASID0_CTRL);
> +
> + err = stmmac_dvr_probe(&pdev->dev, plat, &res);
> + if (err < 0)
> + goto remove;
> +
> + return 0;
> +
> +remove:
> + stmmac_remove_config_dt(pdev, plat);
> + return err;
> +}
> +
> +static int tegra_mgbe_remove(struct platform_device *pdev)
> +{
> + struct tegra_mgbe *mgbe = get_stmmac_bsp_priv(&pdev->dev);
> +
> + clk_bulk_disable_unprepare(ARRAY_SIZE(mgbe_clks), mgbe->clks);
> +
> + stmmac_pltfr_remove(pdev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id tegra_mgbe_match[] = {
> + { .compatible = "nvidia,tegra234-mgbe", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, tegra_mgbe_match);
The DT bindings will land in 6.1, right?
Thanks!
Paolo
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