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Date: Tue, 12 Sep 2023 13:11:58 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Keguang Zhang <keguang.zhang@...il.com>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org, Lee Jones <lee@...nel.org>,
Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>, "David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Giuseppe Cavallaro <peppe.cavallaro@...com>, Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>, Serge Semin <Sergey.Semin@...kalelectronics.ru>
Subject: Re: [PATCH v4 3/4] net: stmmac: Add glue layer for Loongson-1 SoC
On Wed, Aug 30, 2023 at 09:42:40PM +0800, Keguang Zhang wrote:
> This glue driver is created based on the arch-code
> implemented earlier with the platform-specific settings.
>
> Use syscon for SYSCON register access.
>
> Partially based on the previous work by Serge Semin.
>
> Signed-off-by: Keguang Zhang <keguang.zhang@...il.com>
> ---
> V3 -> V4: Drop ls1x_dwmac_syscon definition and its instances
> Drop three redundant fields from the ls1x_dwmac structure
> Drop the ls1x_dwmac_init() method.
> Some minor improvements
> V2 -> V3: Determine the device ID by physical
> base address(suggested by Serge Semin)
> Use regmap instead of regmap fields
> Use syscon_regmap_lookup_by_phandle()
> Some minor fixes
> V1 -> V2: Fix the build errors due to CONFIG_OF being unset
> Change struct reg_field definitions to const
> Rename the syscon property to "loongson,dwmac-syscon"
> Add MII PHY mode for LS1C
>
> drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 +
> drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
> .../ethernet/stmicro/stmmac/dwmac-loongson1.c | 219 ++++++++++++++++++
> 3 files changed, 231 insertions(+)
> create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> index 06c6871f8788..a2b9e289aa36 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> @@ -239,6 +239,17 @@ config DWMAC_INTEL_PLAT
> the stmmac device driver. This driver is used for the Intel Keem Bay
> SoC.
>
> +config DWMAC_LOONGSON1
> + tristate "Loongson1 GMAC support"
> + default MACH_LOONGSON32
> + depends on OF && (MACH_LOONGSON32 || COMPILE_TEST)
> + help
> + Support for ethernet controller on Loongson1 SoC.
> +
> + This selects Loongson1 SoC glue layer support for the stmmac
> + device driver. This driver is used for Loongson1-based boards
> + like Loongson LS1B/LS1C.
> +
> config DWMAC_TEGRA
> tristate "NVIDIA Tegra MGBE support"
> depends on ARCH_TEGRA || COMPILE_TEST
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
> index 5b57aee19267..80e598bd4255 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Makefile
> +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
> @@ -29,6 +29,7 @@ obj-$(CONFIG_DWMAC_SUNXI) += dwmac-sunxi.o
> obj-$(CONFIG_DWMAC_SUN8I) += dwmac-sun8i.o
> obj-$(CONFIG_DWMAC_DWC_QOS_ETH) += dwmac-dwc-qos-eth.o
> obj-$(CONFIG_DWMAC_INTEL_PLAT) += dwmac-intel-plat.o
> +obj-$(CONFIG_DWMAC_LOONGSON1) += dwmac-loongson1.o
> obj-$(CONFIG_DWMAC_GENERIC) += dwmac-generic.o
> obj-$(CONFIG_DWMAC_IMX8) += dwmac-imx.o
> obj-$(CONFIG_DWMAC_TEGRA) += dwmac-tegra.o
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c
> new file mode 100644
> index 000000000000..f1732f15ff87
> --- /dev/null
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c
> @@ -0,0 +1,219 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Loongson-1 DWMAC glue layer
> + *
> + * Copyright (C) 2011-2023 Keguang Zhang <keguang.zhang@...il.com>
> + */
> +
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#include "stmmac.h"
> +#include "stmmac_platform.h"
> +
> +#define LS1B_GMAC0_BASE (0x1fe10000)
I was talking about the LS1B_GMAC1_BASE macro only. Since both LS1B
and LS1C have GMAC0 at the same base address I would preserve
LS1X_GMAC0_BASE name here. But seeing it's unused for the LS1C anyway
it's not that a big deal.
> +#define LS1B_GMAC1_BASE (0x1fe20000)
> +
> +/* Loongson-1 SYSCON Registers */
> +#define LS1X_SYSCON0 (0x0)
> +#define LS1X_SYSCON1 (0x4)
> +
> +/* Loongson-1B SYSCON Register Bits */
> +#define GMAC1_USE_UART1 BIT(4)
> +#define GMAC1_USE_UART0 BIT(3)
> +
> +#define GMAC1_SHUT BIT(13)
> +#define GMAC0_SHUT BIT(12)
> +
> +#define GMAC1_USE_TXCLK BIT(3)
> +#define GMAC0_USE_TXCLK BIT(2)
> +#define GMAC1_USE_PWM23 BIT(1)
> +#define GMAC0_USE_PWM01 BIT(0)
> +
> +/* Loongson-1C SYSCON Register Bits */
> +#define GMAC_SHUT BIT(6)
> +
> +#define PHY_INTF_SELI GENMASK(30, 28)
> +#define PHY_INTF_MII FIELD_PREP(PHY_INTF_SELI, 0)
> +#define PHY_INTF_RMII FIELD_PREP(PHY_INTF_SELI, 4)
> +
> +struct ls1x_dwmac {
> + struct plat_stmmacenet_data *plat_dat;
> + struct regmap *regmap;
> +};
> +
> +static int ls1b_dwmac_syscon_init(struct platform_device *pdev, void *priv)
> +{
> + struct ls1x_dwmac *dwmac = priv;
> + struct plat_stmmacenet_data *plat = dwmac->plat_dat;
> + struct regmap *regmap = dwmac->regmap;
> + struct resource *res;
> + unsigned long reg_base;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(&pdev->dev, "Could not get IO_MEM resources\n");
> + return -EINVAL;
> + }
> + reg_base = (unsigned long)res->start;
> +
> + if (reg_base == LS1B_GMAC0_BASE) {
> + switch (plat->phy_interface) {
> + case PHY_INTERFACE_MODE_RGMII_ID:
> + regmap_update_bits(regmap, LS1X_SYSCON0,
> + GMAC0_USE_TXCLK | GMAC0_USE_PWM01,
> + 0);
> + break;
> + case PHY_INTERFACE_MODE_MII:
> + regmap_update_bits(regmap, LS1X_SYSCON0,
> + GMAC0_USE_TXCLK | GMAC0_USE_PWM01,
> + GMAC0_USE_TXCLK | GMAC0_USE_PWM01);
> + break;
> + default:
> + dev_err(&pdev->dev, "Unsupported PHY mode %u\n",
> + plat->phy_interface);
> + return -EOPNOTSUPP;
> + }
> +
> + regmap_update_bits(regmap, LS1X_SYSCON0, GMAC0_SHUT, 0);
> + } else if (reg_base == LS1B_GMAC1_BASE) {
> + regmap_update_bits(regmap, LS1X_SYSCON0,
> + GMAC1_USE_UART1 | GMAC1_USE_UART0,
> + GMAC1_USE_UART1 | GMAC1_USE_UART0);
> +
> + switch (plat->phy_interface) {
> + case PHY_INTERFACE_MODE_RGMII_ID:
> + regmap_update_bits(regmap, LS1X_SYSCON1,
> + GMAC1_USE_TXCLK | GMAC1_USE_PWM23,
> + 0);
> +
> + break;
> + case PHY_INTERFACE_MODE_MII:
> + regmap_update_bits(regmap, LS1X_SYSCON1,
> + GMAC1_USE_TXCLK | GMAC1_USE_PWM23,
> + GMAC1_USE_TXCLK | GMAC1_USE_PWM23);
> + break;
> + default:
> + dev_err(&pdev->dev, "Unsupported PHY mode %u\n",
> + plat->phy_interface);
> + return -EOPNOTSUPP;
> + }
> +
> + regmap_update_bits(regmap, LS1X_SYSCON1, GMAC1_SHUT, 0);
> + } else {
> + dev_err(&pdev->dev, "Invalid Ethernet MAC base address %lx",
> + reg_base);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int ls1c_dwmac_syscon_init(struct platform_device *pdev, void *priv)
> +{
> + struct ls1x_dwmac *dwmac = priv;
> + struct plat_stmmacenet_data *plat = dwmac->plat_dat;
> + struct regmap *regmap = dwmac->regmap;
> +
> + switch (plat->phy_interface) {
> + case PHY_INTERFACE_MODE_MII:
> + regmap_update_bits(regmap, LS1X_SYSCON1, PHY_INTF_SELI,
> + PHY_INTF_MII);
> + break;
> + case PHY_INTERFACE_MODE_RMII:
> + regmap_update_bits(regmap, LS1X_SYSCON1, PHY_INTF_SELI,
> + PHY_INTF_RMII);
> + break;
> + default:
> + dev_err(&pdev->dev, "Unsupported PHY-mode %u\n",
> + plat->phy_interface);
> + return -EOPNOTSUPP;
> + }
> +
> + regmap_update_bits(regmap, LS1X_SYSCON0, GMAC0_SHUT, 0);
> +
> + return 0;
> +}
> +
> +static int ls1x_dwmac_probe(struct platform_device *pdev)
> +{
> + struct plat_stmmacenet_data *plat_dat;
> + struct stmmac_resources stmmac_res;
> + struct regmap *regmap;
> + struct ls1x_dwmac *dwmac;
> + int (*init)(struct platform_device *pdev, void *priv);
> + int ret;
> +
> + ret = stmmac_get_platform_resources(pdev, &stmmac_res);
> + if (ret)
> + return ret;
> +
> + /* Probe syscon */
> + regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
> + "loongson,ls1-syscon");
> + if (IS_ERR(regmap))
> + return dev_err_probe(&pdev->dev, PTR_ERR(regmap),
> + "Unable to find syscon\n");
> +
> + init = of_device_get_match_data(&pdev->dev);
> + if (!init) {
> + dev_err(&pdev->dev, "No of match data provided\n");
> + return -EINVAL;
> + }
> +
> + dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
> + if (!dwmac)
> + return -ENOMEM;
> +
> + plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
This can be replaced with devm_stmmac_probe_config_dt() and ...
> + if (IS_ERR(plat_dat))
> + return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),
> + "dt configuration failed\n");
> +
> + plat_dat->bsp_priv = dwmac;
> + plat_dat->init = init;
> + dwmac->plat_dat = plat_dat;
> + dwmac->regmap = regmap;
> +
> + ret = stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);
... this can be replaced with devm_stmmac_pltfr_probe() thus ...
> + if (ret)
> + goto err_remove_config_dt;
> +
> + return 0;
> +
> +err_remove_config_dt:
> + stmmac_remove_config_dt(pdev, plat_dat);
> +
> + return ret;
... this could have been omitted and ...
> +}
> +
> +static const struct of_device_id ls1x_dwmac_match[] = {
> + {
> + .compatible = "loongson,ls1b-gmac",
> + .data = &ls1b_dwmac_syscon_init,
> + },
> + {
> + .compatible = "loongson,ls1c-emac",
> + .data = &ls1c_dwmac_syscon_init,
> + },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, ls1x_dwmac_match);
> +
> +static struct platform_driver ls1x_dwmac_driver = {
> + .probe = ls1x_dwmac_probe,
> + .remove_new = stmmac_pltfr_remove,
... this could have been dropped.
-Serge(y)
> + .driver = {
> + .name = "loongson1-dwmac",
> + .of_match_table = ls1x_dwmac_match,
> + },
> +};
> +module_platform_driver(ls1x_dwmac_driver);
> +
> +MODULE_AUTHOR("Keguang Zhang <keguang.zhang@...il.com>");
> +MODULE_DESCRIPTION("Loongson-1 DWMAC glue layer");
> +MODULE_LICENSE("GPL");
> --
> 2.39.2
>
>
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