net: ethernet: dwmac: add Ethernet glue logic for stm32 chip

stm324xx family chips support Synopsys MAC 3.510 IP.
This patch adds settings for logical glue logic:
-clocks
-mode selection MII or RMII.

Reviewed-by: Joachim Eastwood <manabian@gmail.com>
Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Tested-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 8f06a6621ab183b36051801f73174e524c73627c..c732b8ce25281a05660048e465baa781dc77865b 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -104,6 +104,18 @@ config DWMAC_STI
          device driver. This driver is used on for the STi series
          SOCs GMAC ethernet controller.
 
+config DWMAC_STM32
+       tristate "STM32 DWMAC support"
+       default ARCH_STM32
+       depends on OF && HAS_IOMEM
+       select MFD_SYSCON
+       ---help---
+         Support for ethernet controller on STM32 SOCs.
+
+         This selects STM32 SoC glue layer support for the stmmac
+         device driver. This driver is used on for the STM32 series
+         SOCs GMAC ethernet controller.
+
 config DWMAC_SUNXI
        tristate "Allwinner GMAC support"
        default ARCH_SUNXI

diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 44b630cd175520e68c73dad8cc2073f3d9b31d37..f0c9396fa28ee7a4ef24a43522bdd1322c91a107 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_DWMAC_MESON)     += dwmac-meson.o
 obj-$(CONFIG_DWMAC_ROCKCHIP)   += dwmac-rk.o
 obj-$(CONFIG_DWMAC_SOCFPGA)    += dwmac-altr-socfpga.o
 obj-$(CONFIG_DWMAC_STI)                += dwmac-sti.o
+obj-$(CONFIG_DWMAC_STM32)      += dwmac-stm32.o
 obj-$(CONFIG_DWMAC_SUNXI)      += dwmac-sunxi.o
 obj-$(CONFIG_DWMAC_GENERIC)    += dwmac-generic.o
 stmmac-platform-objs:= stmmac_platform.o

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
new file mode 100644 (file)
index 0000000..79d8b92
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -0,0 +1,193 @@
+/*
+ * dwmac-stm32.c - DWMAC Specific Glue layer for STM32 MCU
+ *
+ * Copyright (C) Alexandre Torgue 2015
+ * Author:  Alexandre Torgue <alexandre.torgue@gmail.com>
+ * License terms:  GNU General Public License (GPL), version 2
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_net.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/stmmac.h>
+
+#include "stmmac_platform.h"
+
+#define MII_PHY_SEL_MASK       BIT(23)
+
+struct stm32_dwmac {
+       struct clk *clk_tx;
+       struct clk *clk_rx;
+       u32 mode_reg;           /* MAC glue-logic mode register */
+       struct regmap *regmap;
+       u32 speed;
+};
+
+static int stm32_dwmac_init(struct plat_stmmacenet_data *plat_dat)
+{
+       struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
+       u32 reg = dwmac->mode_reg;
+       u32 val;
+       int ret;
+
+       val = (plat_dat->interface == PHY_INTERFACE_MODE_MII) ? 0 : 1;
+       ret = regmap_update_bits(dwmac->regmap, reg, MII_PHY_SEL_MASK, val);
+       if (ret)
+               return ret;
+
+       ret = clk_prepare_enable(dwmac->clk_tx);
+       if (ret)
+               return ret;
+
+       ret = clk_prepare_enable(dwmac->clk_rx);
+       if (ret)
+               clk_disable_unprepare(dwmac->clk_tx);
+
+       return ret;
+}
+
+static void stm32_dwmac_clk_disable(struct stm32_dwmac *dwmac)
+{
+       clk_disable_unprepare(dwmac->clk_tx);
+       clk_disable_unprepare(dwmac->clk_rx);
+}
+
+static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac,
+                                 struct device *dev)
+{
+       struct device_node *np = dev->of_node;
+       int err;
+
+       /*  Get TX/RX clocks */
+       dwmac->clk_tx = devm_clk_get(dev, "mac-clk-tx");
+       if (IS_ERR(dwmac->clk_tx)) {
+               dev_err(dev, "No tx clock provided...\n");
+               return PTR_ERR(dwmac->clk_tx);
+       }
+       dwmac->clk_rx = devm_clk_get(dev, "mac-clk-rx");
+       if (IS_ERR(dwmac->clk_rx)) {
+               dev_err(dev, "No rx clock provided...\n");
+               return PTR_ERR(dwmac->clk_rx);
+       }
+
+       /* Get mode register */
+       dwmac->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscon");
+       if (IS_ERR(dwmac->regmap))
+               return PTR_ERR(dwmac->regmap);
+
+       err = of_property_read_u32_index(np, "st,syscon", 1, &dwmac->mode_reg);
+       if (err)
+               dev_err(dev, "Can't get sysconfig mode offset (%d)\n", err);
+
+       return err;
+}
+
+static int stm32_dwmac_probe(struct platform_device *pdev)
+{
+       struct plat_stmmacenet_data *plat_dat;
+       struct stmmac_resources stmmac_res;
+       struct stm32_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)
+               return -ENOMEM;
+
+       ret = stm32_dwmac_parse_data(dwmac, &pdev->dev);
+       if (ret) {
+               dev_err(&pdev->dev, "Unable to parse OF data\n");
+               return ret;
+       }
+
+       plat_dat->bsp_priv = dwmac;
+
+       ret = stm32_dwmac_init(plat_dat);
+       if (ret)
+               return ret;
+
+       ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+       if (ret)
+               stm32_dwmac_clk_disable(dwmac);
+
+       return ret;
+}
+
+static int stm32_dwmac_remove(struct platform_device *pdev)
+{
+       struct net_device *ndev = platform_get_drvdata(pdev);
+       struct stmmac_priv *priv = netdev_priv(ndev);
+       int ret = stmmac_dvr_remove(&pdev->dev);
+
+       stm32_dwmac_clk_disable(priv->plat->bsp_priv);
+
+       return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int stm32_dwmac_suspend(struct device *dev)
+{
+       struct net_device *ndev = dev_get_drvdata(dev);
+       struct stmmac_priv *priv = netdev_priv(ndev);
+       int ret;
+
+       ret = stmmac_suspend(dev);
+       stm32_dwmac_clk_disable(priv->plat->bsp_priv);
+
+       return ret;
+}
+
+static int stm32_dwmac_resume(struct device *dev)
+{
+       struct net_device *ndev = dev_get_drvdata(dev);
+       struct stmmac_priv *priv = netdev_priv(ndev);
+       int ret;
+
+       ret = stm32_dwmac_init(priv->plat);
+       if (ret)
+               return ret;
+
+       ret = stmmac_resume(dev);
+
+       return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+SIMPLE_DEV_PM_OPS(stm32_dwmac_pm_ops, stm32_dwmac_suspend, stm32_dwmac_resume);
+
+static const struct of_device_id stm32_dwmac_match[] = {
+       { .compatible = "st,stm32-dwmac"},
+       { }
+};
+MODULE_DEVICE_TABLE(of, stm32_dwmac_match);
+
+static struct platform_driver stm32_dwmac_driver = {
+       .probe  = stm32_dwmac_probe,
+       .remove = stm32_dwmac_remove,
+       .driver = {
+               .name           = "stm32-dwmac",
+               .pm             = &stm32_dwmac_pm_ops,
+               .of_match_table = stm32_dwmac_match,
+       },
+};
+module_platform_driver(stm32_dwmac_driver);
+
+MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@gmail.com>");
+MODULE_DESCRIPTION("STMicroelectronics MCU DWMAC Specific Glue layer");
+MODULE_LICENSE("GPL v2");