ar71xx: add a helper function to set RXDV/RXD of ETH_CFG on AR934x

The ETH_RXDV_DELAY (17:16) and ETH_RXD_DELAY (15:14) are currently not cleared
by the function ath79_setup_ar934x_eth_cfg. Clearing these in the
ath79_setup_ar934x_eth_cfg may cause problems on some hardware because they
rely on the preset value by the bootloader.

Instead another function is introduced which also works on ETH_CFG on AR934x.
It can be used to safely clear and set ETH_RXDV_DELAY and ETH_RXD_DELAY on
machines which require special settings.

Signed-off-by: Sven Eckelmann <sven@open-mesh.com>

SVN-Revision: 45523

target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c

@@ -769,6 +769,32 @@ void __init ath79_setup_ar934x_eth_cfg(u32 mask)
 	iounmap(base);
 }
 
+void __init ath79_setup_ar934x_eth_rx_delay(unsigned int rxd,
+					    unsigned int rxdv)
+{
+	void __iomem *base;
+	u32 t;
+
+	rxd &= AR934X_ETH_CFG_RXD_DELAY_MASK;
+	rxdv &= AR934X_ETH_CFG_RDV_DELAY_MASK;
+
+	base = ioremap(AR934X_GMAC_BASE, AR934X_GMAC_SIZE);
+
+	t = __raw_readl(base + AR934X_GMAC_REG_ETH_CFG);
+
+	t &= ~(AR934X_ETH_CFG_RXD_DELAY_MASK << AR934X_ETH_CFG_RXD_DELAY_SHIFT |
+	       AR934X_ETH_CFG_RDV_DELAY_MASK << AR934X_ETH_CFG_RDV_DELAY_SHIFT);
+
+	t |= (rxd << AR934X_ETH_CFG_RXD_DELAY_SHIFT |
+	      rxdv << AR934X_ETH_CFG_RDV_DELAY_SHIFT);
+
+	__raw_writel(t, base + AR934X_GMAC_REG_ETH_CFG);
+	/* flush write */
+	__raw_readl(base + AR934X_GMAC_REG_ETH_CFG);
+
+	iounmap(base);
+}
+
 void __init ath79_setup_qca955x_eth_cfg(u32 mask)
 {
 	void __iomem *base;

target/linux/ar71xx/files/arch/mips/ath79/dev-eth.h

@@ -47,6 +47,7 @@ void ath79_register_mdio(unsigned int id, u32 phy_mask);
 
 void ath79_setup_ar933x_phy4_switch(bool mac, bool mdio);
 void ath79_setup_ar934x_eth_cfg(u32 mask);
+void ath79_setup_ar934x_eth_rx_delay(unsigned int rxd, unsigned int rxdv);
 void ath79_setup_qca955x_eth_cfg(u32 mask);
 
 #endif /* _ATH79_DEV_ETH_H */