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authorJoachim Eastwood <manabian@gmail.com>2015-05-14 12:10:56 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-15 12:44:21 -0400
commitd58617ea66b1135fc6efcb3036a7a23471c96eaa (patch)
tree155044e0e0a6eb40828522a465d18112b87d8401 /drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c
parent7eafd9b4005643cfc24f1daf78f4dd56ff71f559 (diff)
stmmac: add dwmac glue for NXP 18xx/43xx family
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>
Diffstat (limited to 'drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c')
-rw-r--r--drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c74
1 files changed, 74 insertions, 0 deletions
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..be02b6a1475f
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c
@@ -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,
+};