net: Add Aeroflex Gaisler 10/100/1G Ethernet MAC driver

Adds device driver for Aeroflex Gaisler 10/100 and 10/100/1G Ethernet
MAC IP cores.

Signed-off-by: Kristoffer Glembo <kristoffer@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -2373,6 +2373,12 @@ F:	Documentation/isdn/README.gigaset
 F:	drivers/isdn/gigaset/
 F:	include/linux/gigaset_dev.h
 
+GRETH 10/100/1G Ethernet MAC device driver
+M:	Kristoffer Glembo <kristoffer@gaisler.com>
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	drivers/net/greth*
+
 HARD DRIVE ACTIVE PROTECTION SYSTEM (HDAPS) DRIVER
 M:	Frank Seidel <frank@f-seidel.de>
 L:	lm-sensors@lm-sensors.org

drivers/net/Kconfig

@@ -995,6 +995,14 @@ config ETHOC
 	help
 	  Say Y here if you want to use the OpenCores 10/100 Mbps Ethernet MAC.
 
+config GRETH
+	tristate "Aeroflex Gaisler GRETH Ethernet MAC support"
+	depends on OF
+	select PHYLIB
+	select CRC32
+	help
+	  Say Y here if you want to use the Aeroflex Gaisler GRETH Ethernet MAC.
+
 config SMC911X
 	tristate "SMSC LAN911[5678] support"
 	select CRC32

drivers/net/Makefile

@@ -250,6 +250,7 @@ pasemi_mac_driver-objs := pasemi_mac.o pasemi_mac_ethtool.o
 obj-$(CONFIG_MLX4_CORE) += mlx4/
 obj-$(CONFIG_ENC28J60) += enc28j60.o
 obj-$(CONFIG_ETHOC) += ethoc.o
+obj-$(CONFIG_GRETH) += greth.o
 
 obj-$(CONFIG_XTENSA_XT2000_SONIC) += xtsonic.o
 

drivers/net/greth.h

@@ -0,0 +1,143 @@
+#ifndef GRETH_H
+#define GRETH_H
+
+#include <linux/phy.h>
+
+/* Register bits and masks */
+#define GRETH_RESET 0x40
+#define GRETH_MII_BUSY 0x8
+#define GRETH_MII_NVALID 0x10
+
+#define GRETH_CTRL_FD         0x10
+#define GRETH_CTRL_PR         0x20
+#define GRETH_CTRL_SP         0x80
+#define GRETH_CTRL_GB         0x100
+#define GRETH_CTRL_PSTATIEN   0x400
+#define GRETH_CTRL_MCEN       0x800
+#define GRETH_CTRL_DISDUPLEX  0x1000
+#define GRETH_STATUS_PHYSTAT  0x100
+
+#define GRETH_BD_EN 0x800
+#define GRETH_BD_WR 0x1000
+#define GRETH_BD_IE 0x2000
+#define GRETH_BD_LEN 0x7FF
+
+#define GRETH_TXEN 0x1
+#define GRETH_INT_TX 0x8
+#define GRETH_TXI 0x4
+#define GRETH_TXBD_STATUS 0x0001C000
+#define GRETH_TXBD_MORE 0x20000
+#define GRETH_TXBD_IPCS 0x40000
+#define GRETH_TXBD_TCPCS 0x80000
+#define GRETH_TXBD_UDPCS 0x100000
+#define GRETH_TXBD_CSALL (GRETH_TXBD_IPCS | GRETH_TXBD_TCPCS | GRETH_TXBD_UDPCS)
+#define GRETH_TXBD_ERR_LC 0x10000
+#define GRETH_TXBD_ERR_UE 0x4000
+#define GRETH_TXBD_ERR_AL 0x8000
+
+#define GRETH_INT_RX         0x4
+#define GRETH_RXEN           0x2
+#define GRETH_RXI            0x8
+#define GRETH_RXBD_STATUS    0xFFFFC000
+#define GRETH_RXBD_ERR_AE    0x4000
+#define GRETH_RXBD_ERR_FT    0x8000
+#define GRETH_RXBD_ERR_CRC   0x10000
+#define GRETH_RXBD_ERR_OE    0x20000
+#define GRETH_RXBD_ERR_LE    0x40000
+#define GRETH_RXBD_IP        0x80000
+#define GRETH_RXBD_IP_CSERR  0x100000
+#define GRETH_RXBD_UDP       0x200000
+#define GRETH_RXBD_UDP_CSERR 0x400000
+#define GRETH_RXBD_TCP       0x800000
+#define GRETH_RXBD_TCP_CSERR 0x1000000
+#define GRETH_RXBD_IP_FRAG   0x2000000
+#define GRETH_RXBD_MCAST     0x4000000
+
+/* Descriptor parameters */
+#define GRETH_TXBD_NUM 128
+#define GRETH_TXBD_NUM_MASK (GRETH_TXBD_NUM-1)
+#define GRETH_TX_BUF_SIZE 2048
+#define GRETH_RXBD_NUM 128
+#define GRETH_RXBD_NUM_MASK (GRETH_RXBD_NUM-1)
+#define GRETH_RX_BUF_SIZE 2048
+
+/* Buffers per page */
+#define GRETH_RX_BUF_PPGAE	(PAGE_SIZE/GRETH_RX_BUF_SIZE)
+#define GRETH_TX_BUF_PPGAE	(PAGE_SIZE/GRETH_TX_BUF_SIZE)
+
+/* How many pages are needed for buffers */
+#define GRETH_RX_BUF_PAGE_NUM	(GRETH_RXBD_NUM/GRETH_RX_BUF_PPGAE)
+#define GRETH_TX_BUF_PAGE_NUM	(GRETH_TXBD_NUM/GRETH_TX_BUF_PPGAE)
+
+/* Buffer size.
+ * Gbit MAC uses tagged maximum frame size which is 1518 excluding CRC.
+ * Set to 1520 to make all buffers word aligned for non-gbit MAC.
+ */
+#define MAX_FRAME_SIZE		1520
+
+/* Flags */
+#define GRETH_FLAG_RX_CSUM 0x1
+
+/* GRETH APB registers */
+struct greth_regs {
+	u32 control;
+	u32 status;
+	u32 esa_msb;
+	u32 esa_lsb;
+	u32 mdio;
+	u32 tx_desc_p;
+	u32 rx_desc_p;
+	u32 edclip;
+	u32 hash_msb;
+	u32 hash_lsb;
+};
+
+/* GRETH buffer descriptor */
+struct greth_bd {
+	u32 stat;
+	u32 addr;
+};
+
+struct greth_private {
+	struct sk_buff *rx_skbuff[GRETH_RXBD_NUM];
+	struct sk_buff *tx_skbuff[GRETH_TXBD_NUM];
+
+	unsigned char *tx_bufs[GRETH_TXBD_NUM];
+	unsigned char *rx_bufs[GRETH_RXBD_NUM];
+
+	u16 tx_next;
+	u16 tx_last;
+	u16 tx_free;
+	u16 rx_cur;
+
+	struct greth_regs *regs;	/* Address of controller registers. */
+	struct greth_bd *rx_bd_base;	/* Address of Rx BDs. */
+	struct greth_bd *tx_bd_base;	/* Address of Tx BDs. */
+	dma_addr_t rx_bd_base_phys;
+	dma_addr_t tx_bd_base_phys;
+
+	int irq;
+
+	struct device *dev;	        /* Pointer to of_device->dev */
+	struct net_device *netdev;
+	struct napi_struct napi;
+	spinlock_t devlock;
+
+	struct phy_device *phy;
+	struct mii_bus *mdio;
+	int mdio_irqs[PHY_MAX_ADDR];
+	unsigned int link;
+	unsigned int speed;
+	unsigned int duplex;
+
+	u32 msg_enable;
+	u32 flags;
+
+	u8 phyaddr;
+	u8 multicast;
+	u8 gbit_mac;
+	u8 mdio_int_en;
+	u8 edcl;
+};
+
+#endif