From: Rusaimi Amira Ruslan <rusaimi.amira.rusaimi@xxxxxxxxx>
Add dwmac-intel-plat to enable the stmmac driver in Intel Keem Bay.
Also add fix_mac_speed and tx_clk in order to change link speeds.
This is required as mac_speed_o is not connected in the
Intel Keem Bay SoC.
Signed-off-by: Rusaimi Amira Ruslan <rusaimi.amira.rusaimi@xxxxxxxxx>
Signed-off-by: Vineetha G. Jaya Kumaran <vineetha.g.jaya.kumaran@xxxxxxxxx>
---
drivers/net/ethernet/stmicro/stmmac/Kconfig | 10 ++
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../net/ethernet/stmicro/stmmac/dwmac-intel-plat.c | 191 +++++++++++++++++++++
3 files changed, 202 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-intel-plat.c
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 9a47c5a..7572cea 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -209,6 +209,16 @@ config DWMAC_IMX8
device driver. This driver is used for i.MX8 series like
iMX8MP/iMX8DXL GMAC ethernet controller.
+config DWMAC_INTEL_PLAT
+ tristate "Intel dwmac support"
+ depends on OF && COMMON_CLK
+ depends on STMMAC_ETH
+ help
+ Support for ethernet controllers on Intel SoCs
+
+ This selects the Intel platform specific glue layer support for
+ the stmmac device driver. This driver is used for the Intel Keem Bay
+ SoC.
endif
config DWMAC_INTEL
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 295615a..24e6145 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_DWMAC_STM32) += dwmac-stm32.o
obj-$(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_GENERIC) += dwmac-generic.o
obj-$(CONFIG_DWMAC_IMX8) += dwmac-imx.o
stmmac-platform-objs:= stmmac_platform.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel-plat.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel-plat.c
new file mode 100644
index 00000000..ccac7bf
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel-plat.c
@@ -0,0 +1,191 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Intel DWMAC platform driver
+ *
+ * Copyright(C) 2020 Intel Corporation
+ */
+
+#include <linux/ethtool.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/stmmac.h>
+
+#include "stmmac.h"
+#include "stmmac_platform.h"
+
+struct intel_dwmac {
+ struct device *dev;
+ struct clk *tx_clk;
+ const struct intel_dwmac_data *data;
+};
+
+struct intel_dwmac_data {
+ void (*fix_mac_speed)(void *priv, unsigned int speed);
+ unsigned long ptp_ref_clk_rate;
+ unsigned long tx_clk_rate;
+ bool tx_clk_en;
+};
+
+static void kmb_eth_fix_mac_speed(void *priv, unsigned int speed)
+{
+ struct intel_dwmac *dwmac = priv;
+ unsigned long rate;
+ int ret;
+
+ rate = clk_get_rate(dwmac->tx_clk);
+
+ switch (speed) {
+ case SPEED_1000:
+ rate = 125000000;
+ break;
+
+ case SPEED_100:
+ rate = 25000000;
+ break;
+
+ case SPEED_10:
+ rate = 2500000;
+ break;
+
+ default:
+ dev_err(dwmac->dev, "Invalid speed\n");
+ break;
+ }
+
+ ret = clk_set_rate(dwmac->tx_clk, rate);
+ if (ret)
+ dev_err(dwmac->dev, "Failed to configure tx clock rate\n");
+}
+
+static const struct intel_dwmac_data kmb_data = {
+ .fix_mac_speed = kmb_eth_fix_mac_speed,
+ .ptp_ref_clk_rate = 200000000,
+ .tx_clk_rate = 125000000,
+ .tx_clk_en = true,
+};
+
+static const struct of_device_id intel_eth_plat_match[] = {
+ { .compatible = "intel,keembay-dwmac", .data = &kmb_data },
+ { }
+};
+MODULE_DEVICE_TABLE(of, intel_eth_plat_match);
+
+static int intel_eth_plat_probe(struct platform_device *pdev)
+{
+ struct net_device *ndev = platform_get_drvdata(pdev);
+ struct stmmac_priv *priv = netdev_priv(ndev);
+ struct plat_stmmacenet_data *plat_dat;
+ struct stmmac_resources stmmac_res;
+ const struct of_device_id *match;
+ struct intel_dwmac *dwmac;
+ unsigned long rate;
+ int ret;
+
+ plat_dat = priv->plat;
+ 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)) {
+ dev_err(&pdev->dev, "dt configuration failed\n");
+ return PTR_ERR(plat_dat);
+ }
+
+ dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+ if (!dwmac) {
+ ret = -ENOMEM;
+ goto err_remove_config_dt;
+ }
+
+ dwmac->dev = &pdev->dev;
+ dwmac->tx_clk = NULL;
+
+ match = of_match_device(intel_eth_plat_match, &pdev->dev);
+ if (match && match->data) {
+ dwmac->data = (const struct intel_dwmac_data *)match->data;
+
+ if (dwmac->data->fix_mac_speed)
+ plat_dat->fix_mac_speed = dwmac->data->fix_mac_speed;
+
+ /* Enable TX clock */
+ if (dwmac->data->tx_clk_en) {
+ dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
+ if (IS_ERR(dwmac->tx_clk))
+ goto err_remove_config_dt;
+
+ clk_prepare_enable(dwmac->tx_clk);
+
+ /* Check and configure TX clock rate */
+ rate = clk_get_rate(dwmac->tx_clk);
+ if (dwmac->data->tx_clk_rate &&
+ rate != dwmac->data->tx_clk_rate) {
+ rate = dwmac->data->tx_clk_rate;
+ ret = clk_set_rate(dwmac->tx_clk, rate);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Failed to set tx_clk\n");
+ return ret;
+ }
+ }
+ }
+
+ /* Check and configure PTP ref clock rate */
+ rate = clk_get_rate(plat_dat->clk_ptp_ref);
+ if (dwmac->data->ptp_ref_clk_rate &&
+ rate != dwmac->data->ptp_ref_clk_rate) {
+ rate = dwmac->data->ptp_ref_clk_rate;
+ ret = clk_set_rate(plat_dat->clk_ptp_ref, rate);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Failed to set clk_ptp_ref\n");
+ return ret;
+ }
+ }
+ }
+
+ plat_dat->bsp_priv = dwmac;
+
+ ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+ if (ret) {
+ if (dwmac->tx_clk)
+ clk_disable_unprepare(dwmac->tx_clk);
+
+ goto err_remove_config_dt;
+ }
+
+ return 0;
+
+err_remove_config_dt:
+ stmmac_remove_config_dt(pdev, plat_dat);
+
+ return ret;
+}
+
+static int intel_eth_plat_remove(struct platform_device *pdev)
+{
+ struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
+ int ret;
+
+ ret = stmmac_pltfr_remove(pdev);
+
+ if (dwmac->tx_clk)
+ clk_disable_unprepare(dwmac->tx_clk);
+
+ return ret;
+}
+
+static struct platform_driver intel_eth_plat_driver = {
+ .probe = intel_eth_plat_probe,
+ .remove = intel_eth_plat_remove,
+ .driver = {
+ .name = "intel-eth-plat",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = intel_eth_plat_match,
+ },
+};
+module_platform_driver(intel_eth_plat_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Intel DWMAC platform driver");
--
1.9.1
