stmmac: add dwmac glue for NXP 18xx/43xx family
authorJoachim Eastwood <manabian@gmail.com>
Thu, 14 May 2015 10:10:56 +0000 (12:10 +0200)
committerDavid S. Miller <davem@davemloft.net>
Fri, 15 May 2015 16:44:21 +0000 (12:44 -0400)
Add support for Ethernet on NXP LPC18xx and LPC43xx using the
dwmac driver. This glue is required to setup phy interface
mode, MII or RMII, on the SoC.

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/stmicro/stmmac/Makefile
drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c [new file with mode: 0644]
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h

index 73c2715a27f39c9d545d3cead884e67ed5d82a0e..5c165d8d70047c6f4869a42c1b0134584d6f100f 100644 (file)
@@ -6,7 +6,8 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o  \
 
 obj-$(CONFIG_STMMAC_PLATFORM) += stmmac-platform.o
 stmmac-platform-objs:= stmmac_platform.o dwmac-meson.o dwmac-sunxi.o   \
-                      dwmac-sti.o dwmac-socfpga.o dwmac-rk.o
+                      dwmac-sti.o dwmac-socfpga.o dwmac-rk.o           \
+                      dwmac-lpc18xx.o
 
 obj-$(CONFIG_STMMAC_PCI) += stmmac-pci.o
 stmmac-pci-objs:= stmmac_pci.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c
new file mode 100644 (file)
index 0000000..be02b6a
--- /dev/null
@@ -0,0 +1,74 @@
+/*
+ * DWMAC glue for NXP LPC18xx/LPC43xx Ethernet
+ *
+ * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/of_net.h>
+#include <linux/phy.h>
+#include <linux/regmap.h>
+#include <linux/stmmac.h>
+
+/* Register defines for CREG syscon */
+#define LPC18XX_CREG_CREG6                     0x12c
+# define LPC18XX_CREG_CREG6_ETHMODE_MASK       0x7
+# define LPC18XX_CREG_CREG6_ETHMODE_MII                0x0
+# define LPC18XX_CREG_CREG6_ETHMODE_RMII       0x4
+
+struct lpc18xx_dwmac_priv_data {
+       struct regmap *reg;
+       int interface;
+};
+
+static void *lpc18xx_dwmac_setup(struct platform_device *pdev)
+{
+       struct lpc18xx_dwmac_priv_data *dwmac;
+
+       dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+       if (!dwmac)
+               return ERR_PTR(-ENOMEM);
+
+       dwmac->interface = of_get_phy_mode(pdev->dev.of_node);
+       if (dwmac->interface < 0)
+               return ERR_PTR(dwmac->interface);
+
+       dwmac->reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");
+       if (IS_ERR(dwmac->reg)) {
+               dev_err(&pdev->dev, "Syscon lookup failed\n");
+               return dwmac->reg;
+       }
+
+       return dwmac;
+}
+
+static int lpc18xx_dwmac_init(struct platform_device *pdev, void *priv)
+{
+       struct lpc18xx_dwmac_priv_data *dwmac = priv;
+       u8 ethmode;
+
+       if (dwmac->interface == PHY_INTERFACE_MODE_MII) {
+               ethmode = LPC18XX_CREG_CREG6_ETHMODE_MII;
+       } else if (dwmac->interface == PHY_INTERFACE_MODE_RMII) {
+               ethmode = LPC18XX_CREG_CREG6_ETHMODE_RMII;
+       } else {
+               dev_err(&pdev->dev, "Only MII and RMII mode supported\n");
+               return -EINVAL;
+       }
+
+       regmap_update_bits(dwmac->reg, LPC18XX_CREG_CREG6,
+                          LPC18XX_CREG_CREG6_ETHMODE_MASK, ethmode);
+
+       return 0;
+}
+
+const struct stmmac_of_data lpc18xx_dwmac_data = {
+       .has_gmac = 1,
+       .setup = lpc18xx_dwmac_setup,
+       .init = lpc18xx_dwmac_init,
+};
index 68aec5c460db46c1378cdf122c3ad8f4eba15e86..1ac7c8a2c631ac62a73376bacb9c8a1abe99c6eb 100644 (file)
@@ -37,6 +37,7 @@ static const struct of_device_id stmmac_dt_ids[] = {
        { .compatible = "rockchip,rk3288-gmac", .data = &rk3288_gmac_data},
        { .compatible = "amlogic,meson6-dwmac", .data = &meson6_dwmac_data},
        { .compatible = "allwinner,sun7i-a20-gmac", .data = &sun7i_gmac_data},
+       { .compatible = "nxp,lpc1850-dwmac", .data = &lpc18xx_dwmac_data},
        { .compatible = "st,stih415-dwmac", .data = &stih4xx_dwmac_data},
        { .compatible = "st,stih416-dwmac", .data = &stih4xx_dwmac_data},
        { .compatible = "st,stid127-dwmac", .data = &stid127_dwmac_data},
index 093eb99e5ffd96d2ade4aecaaba357ac8dd8ef7e..59fe8fb46a486443c27271816e96b320b9580d25 100644 (file)
@@ -19,6 +19,7 @@
 #ifndef __STMMAC_PLATFORM_H__
 #define __STMMAC_PLATFORM_H__
 
+extern const struct stmmac_of_data lpc18xx_dwmac_data;
 extern const struct stmmac_of_data meson6_dwmac_data;
 extern const struct stmmac_of_data sun7i_gmac_data;
 extern const struct stmmac_of_data stih4xx_dwmac_data;