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Message-Id: <1431022765-30715-3-git-send-email-manabian@gmail.com>
Date: Thu, 7 May 2015 20:19:25 +0200
From: Joachim Eastwood <manabian@...il.com>
To: arnd@...db.de
Cc: peppe.cavallaro@...com, netdev@...r.kernel.org,
davem@...emloft.net, linux-arm-kernel@...ts.infradead.org,
Joachim Eastwood <manabian@...il.com>
Subject: [PATCH RFC 2/2] stmac: add dwmac glue for NXP 18xx/43xx family
Add support for using the dwmac on NXP LPC18xx and
LPC43xx devices.
Signed-off-by: Joachim Eastwood <manabian@...il.com>
---
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c | 98 ++++++++++++++++++++++
2 files changed, 99 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index f35e2bcde55f..560642a44134 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -7,6 +7,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o \
# ordering matters; keep stmmac_platform.o at the bottom
obj-$(CONFIG_STMMAC_PLATFORM) += stmmac-platform.o
stmmac-platform-objs:= \
+ dwmac-lpc18xx.o \
dwmac-meson.o \
dwmac-rk.o \
dwmac-socfpga.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
index 000000000000..ed9ec45cb5ac
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c
@@ -0,0 +1,98 @@
+/*
+ * STMAC glue for NXP LPC18xx/LPC43xx Ethernet
+ *
+ * Copyright (C) 2015 Joachim Eastwood <manabian@...il.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/module.h>
+#include <linux/of.h>
+#include <linux/of_net.h>
+#include <linux/phy.h>
+#include <linux/regmap.h>
+#include <linux/stmmac.h>
+
+#include "stmmac_platform.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;
+}
+
+static const struct stmmac_of_data lpc18xx_dwmac_data = {
+ .has_gmac = 1,
+ .setup = lpc18xx_dwmac_setup,
+ .init = lpc18xx_dwmac_init,
+};
+
+static const struct of_device_id lpc18xx_dwmac_match[] = {
+ { .compatible = "nxp,lpc1850-dwmac", .data = &lpc18xx_dwmac_data },
+ { }
+};
+MODULE_DEVICE_TABLE(of, lpc18xx_dwmac_match);
+
+static struct platform_driver lpc18xx_dwmac_driver = {
+ .probe = stmmac_pltfr_probe,
+ .remove = stmmac_pltfr_remove,
+ .driver = {
+ .name = "lpc18xx-dwmac",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = lpc18xx_dwmac_match,
+ },
+};
+module_platform_driver(lpc18xx_dwmac_driver);
+
+MODULE_AUTHOR("Joachim Eastwood <manabian@...il.com>");
+MODULE_DESCRIPTION("Driver for Ethernet on LPC18xx/43xx");
+MODULE_LICENSE("GPL v2");
--
1.8.0
--
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