net: stmmac: dwmac-oxnas: remove obsolete dwmac glue driver

Due to lack of maintenance and stall of development for a few years now,
and since no new features will ever be added upstream, remove support
for OX810 and OX820 ethernet.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Daniel Golle <daniel@makrotopia.org>
Acked-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/Kconfig

@@ -121,17 +121,6 @@ config DWMAC_MESON
 	  the stmmac device driver. This driver is used for Meson6,
 	  Meson8, Meson8b and GXBB SoCs.
 
-config DWMAC_OXNAS
-	tristate "Oxford Semiconductor OXNAS dwmac support"
-	default ARCH_OXNAS
-	depends on OF && COMMON_CLK && (ARCH_OXNAS || COMPILE_TEST)
-	select MFD_SYSCON
-	help
-	  Support for Ethernet controller on Oxford Semiconductor OXNAS SoCs.
-
-	  This selects the Oxford Semiconductor OXNASSoC glue layer support for
-	  the stmmac device driver. This driver is used for OX820.
-
 config DWMAC_QCOM_ETHQOS
 	tristate "Qualcomm ETHQOS support"
 	default ARCH_QCOM

drivers/net/ethernet/stmicro/stmmac/Makefile

@@ -19,7 +19,6 @@ obj-$(CONFIG_DWMAC_IPQ806X)	+= dwmac-ipq806x.o
 obj-$(CONFIG_DWMAC_LPC18XX)	+= dwmac-lpc18xx.o
 obj-$(CONFIG_DWMAC_MEDIATEK)	+= dwmac-mediatek.o
 obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o dwmac-meson8b.o
-obj-$(CONFIG_DWMAC_OXNAS)	+= dwmac-oxnas.o
 obj-$(CONFIG_DWMAC_QCOM_ETHQOS)	+= dwmac-qcom-ethqos.o
 obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rk.o
 obj-$(CONFIG_DWMAC_SOCFPGA)	+= dwmac-altr-socfpga.o

drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Oxford Semiconductor OXNAS DWMAC glue layer
- *
- * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
- * Copyright (C) 2014 Daniel Golle <daniel@makrotopia.org>
- * Copyright (C) 2013 Ma Haijun <mahaijuns@gmail.com>
- * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
- */
-
-#include <linux/device.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/regmap.h>
-#include <linux/mfd/syscon.h>
-#include <linux/stmmac.h>
-
-#include "stmmac_platform.h"
-
-/* System Control regmap offsets */
-#define OXNAS_DWMAC_CTRL_REGOFFSET	0x78
-#define OXNAS_DWMAC_DELAY_REGOFFSET	0x100
-
-/* Control Register */
-#define DWMAC_CKEN_RX_IN        14
-#define DWMAC_CKEN_RXN_OUT      13
-#define DWMAC_CKEN_RX_OUT       12
-#define DWMAC_CKEN_TX_IN        10
-#define DWMAC_CKEN_TXN_OUT      9
-#define DWMAC_CKEN_TX_OUT       8
-#define DWMAC_RX_SOURCE         7
-#define DWMAC_TX_SOURCE         6
-#define DWMAC_LOW_TX_SOURCE     4
-#define DWMAC_AUTO_TX_SOURCE    3
-#define DWMAC_RGMII             2
-#define DWMAC_SIMPLE_MUX        1
-#define DWMAC_CKEN_GTX          0
-
-/* Delay register */
-#define DWMAC_TX_VARDELAY_SHIFT		0
-#define DWMAC_TXN_VARDELAY_SHIFT	8
-#define DWMAC_RX_VARDELAY_SHIFT		16
-#define DWMAC_RXN_VARDELAY_SHIFT	24
-#define DWMAC_TX_VARDELAY(d)		((d) << DWMAC_TX_VARDELAY_SHIFT)
-#define DWMAC_TXN_VARDELAY(d)		((d) << DWMAC_TXN_VARDELAY_SHIFT)
-#define DWMAC_RX_VARDELAY(d)		((d) << DWMAC_RX_VARDELAY_SHIFT)
-#define DWMAC_RXN_VARDELAY(d)		((d) << DWMAC_RXN_VARDELAY_SHIFT)
-
-struct oxnas_dwmac;
-
-struct oxnas_dwmac_data {
-	int (*setup)(struct oxnas_dwmac *dwmac);
-};
-
-struct oxnas_dwmac {
-	struct device	*dev;
-	struct clk	*clk;
-	struct regmap	*regmap;
-	const struct oxnas_dwmac_data	*data;
-};
-
-static int oxnas_dwmac_setup_ox810se(struct oxnas_dwmac *dwmac)
-{
-	unsigned int value;
-	int ret;
-
-	ret = regmap_read(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, &value);
-	if (ret < 0)
-		return ret;
-
-	/* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
-	value |= BIT(DWMAC_CKEN_GTX)		|
-		 /* Use simple mux for 25/125 Mhz clock switching */
-		 BIT(DWMAC_SIMPLE_MUX);
-
-	regmap_write(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, value);
-
-	return 0;
-}
-
-static int oxnas_dwmac_setup_ox820(struct oxnas_dwmac *dwmac)
-{
-	unsigned int value;
-	int ret;
-
-	ret = regmap_read(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, &value);
-	if (ret < 0)
-		return ret;
-
-	/* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
-	value |= BIT(DWMAC_CKEN_GTX)		|
-		 /* Use simple mux for 25/125 Mhz clock switching */
-		BIT(DWMAC_SIMPLE_MUX)		|
-		/* set auto switch tx clock source */
-		BIT(DWMAC_AUTO_TX_SOURCE)	|
-		/* enable tx & rx vardelay */
-		BIT(DWMAC_CKEN_TX_OUT)		|
-		BIT(DWMAC_CKEN_TXN_OUT)	|
-		BIT(DWMAC_CKEN_TX_IN)		|
-		BIT(DWMAC_CKEN_RX_OUT)		|
-		BIT(DWMAC_CKEN_RXN_OUT)	|
-		BIT(DWMAC_CKEN_RX_IN);
-	regmap_write(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, value);
-
-	/* set tx & rx vardelay */
-	value = DWMAC_TX_VARDELAY(4)	|
-		DWMAC_TXN_VARDELAY(2)	|
-		DWMAC_RX_VARDELAY(10)	|
-		DWMAC_RXN_VARDELAY(8);
-	regmap_write(dwmac->regmap, OXNAS_DWMAC_DELAY_REGOFFSET, value);
-
-	return 0;
-}
-
-static int oxnas_dwmac_init(struct platform_device *pdev, void *priv)
-{
-	struct oxnas_dwmac *dwmac = priv;
-	int ret;
-
-	/* Reset HW here before changing the glue configuration */
-	ret = device_reset(dwmac->dev);
-	if (ret)
-		return ret;
-
-	ret = clk_prepare_enable(dwmac->clk);
-	if (ret)
-		return ret;
-
-	ret = dwmac->data->setup(dwmac);
-	if (ret)
-		clk_disable_unprepare(dwmac->clk);
-
-	return ret;
-}
-
-static void oxnas_dwmac_exit(struct platform_device *pdev, void *priv)
-{
-	struct oxnas_dwmac *dwmac = priv;
-
-	clk_disable_unprepare(dwmac->clk);
-}
-
-static int oxnas_dwmac_probe(struct platform_device *pdev)
-{
-	struct plat_stmmacenet_data *plat_dat;
-	struct stmmac_resources stmmac_res;
-	struct oxnas_dwmac *dwmac;
-	int ret;
-
-	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
-	if (ret)
-		return ret;
-
-	plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
-	if (IS_ERR(plat_dat))
-		return PTR_ERR(plat_dat);
-
-	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
-	if (!dwmac) {
-		ret = -ENOMEM;
-		goto err_remove_config_dt;
-	}
-
-	dwmac->data = (const struct oxnas_dwmac_data *)of_device_get_match_data(&pdev->dev);
-	if (!dwmac->data) {
-		ret = -EINVAL;
-		goto err_remove_config_dt;
-	}
-
-	dwmac->dev = &pdev->dev;
-	plat_dat->bsp_priv = dwmac;
-	plat_dat->init = oxnas_dwmac_init;
-	plat_dat->exit = oxnas_dwmac_exit;
-
-	dwmac->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
-							"oxsemi,sys-ctrl");
-	if (IS_ERR(dwmac->regmap)) {
-		dev_err(&pdev->dev, "failed to have sysctrl regmap\n");
-		ret = PTR_ERR(dwmac->regmap);
-		goto err_remove_config_dt;
-	}
-
-	dwmac->clk = devm_clk_get(&pdev->dev, "gmac");
-	if (IS_ERR(dwmac->clk)) {
-		ret = PTR_ERR(dwmac->clk);
-		goto err_remove_config_dt;
-	}
-
-	ret = oxnas_dwmac_init(pdev, plat_dat->bsp_priv);
-	if (ret)
-		goto err_remove_config_dt;
-
-	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
-	if (ret)
-		goto err_dwmac_exit;
-
-
-	return 0;
-
-err_dwmac_exit:
-	oxnas_dwmac_exit(pdev, plat_dat->bsp_priv);
-err_remove_config_dt:
-	stmmac_remove_config_dt(pdev, plat_dat);
-
-	return ret;
-}
-
-static const struct oxnas_dwmac_data ox810se_dwmac_data = {
-	.setup = oxnas_dwmac_setup_ox810se,
-};
-
-static const struct oxnas_dwmac_data ox820_dwmac_data = {
-	.setup = oxnas_dwmac_setup_ox820,
-};
-
-static const struct of_device_id oxnas_dwmac_match[] = {
-	{
-		.compatible = "oxsemi,ox810se-dwmac",
-		.data = &ox810se_dwmac_data,
-	},
-	{
-		.compatible = "oxsemi,ox820-dwmac",
-		.data = &ox820_dwmac_data,
-	},
-	{ }
-};
-MODULE_DEVICE_TABLE(of, oxnas_dwmac_match);
-
-static struct platform_driver oxnas_dwmac_driver = {
-	.probe  = oxnas_dwmac_probe,
-	.remove_new = stmmac_pltfr_remove,
-	.driver = {
-		.name           = "oxnas-dwmac",
-		.pm		= &stmmac_pltfr_pm_ops,
-		.of_match_table = oxnas_dwmac_match,
-	},
-};
-module_platform_driver(oxnas_dwmac_driver);
-
-MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
-MODULE_DESCRIPTION("Oxford Semiconductor OXNAS DWMAC glue layer");
-MODULE_LICENSE("GPL v2");