/* * (C) Copyright 2007-2009 Michal Simek * (C) Copyright 2003 Xilinx Inc. * * Michal SIMEK * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include #include #include #include #include #undef DEBUG #define ENET_MAX_MTU PKTSIZE #define ENET_MAX_MTU_ALIGNED PKTSIZE_ALIGN #define ENET_ADDR_LENGTH 6 /* EmacLite constants */ #define XEL_BUFFER_OFFSET 0x0800 /* Next buffer's offset */ #define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */ #define XEL_TSR_OFFSET 0x07FC /* Tx status */ #define XEL_RSR_OFFSET 0x17FC /* Rx status */ #define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */ /* Xmit complete */ #define XEL_TSR_XMIT_BUSY_MASK 0x00000001UL /* Xmit interrupt enable bit */ #define XEL_TSR_XMIT_IE_MASK 0x00000008UL /* Buffer is active, SW bit only */ #define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000UL /* Program the MAC address */ #define XEL_TSR_PROGRAM_MASK 0x00000002UL /* define for programming the MAC address into the EMAC Lite */ #define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK) /* Transmit packet length upper byte */ #define XEL_TPLR_LENGTH_MASK_HI 0x0000FF00UL /* Transmit packet length lower byte */ #define XEL_TPLR_LENGTH_MASK_LO 0x000000FFUL /* Recv complete */ #define XEL_RSR_RECV_DONE_MASK 0x00000001UL /* Recv interrupt enable bit */ #define XEL_RSR_RECV_IE_MASK 0x00000008UL typedef struct { u32 baseaddress; /* Base address for device (IPIF) */ u32 nexttxbuffertouse; /* Next TX buffer to write to */ u32 nextrxbuffertouse; /* Next RX buffer to read from */ uchar deviceid; /* Unique ID of device - for future */ } xemaclite; static xemaclite emaclite; static u32 etherrxbuff[PKTSIZE_ALIGN/4]; /* Receive buffer */ static void xemaclite_alignedread (u32 *srcptr, void *destptr, u32 bytecount) { u32 i; u32 alignbuffer; u32 *to32ptr; u32 *from32ptr; u8 *to8ptr; u8 *from8ptr; from32ptr = (u32 *) srcptr; /* Word aligned buffer, no correction needed. */ to32ptr = (u32 *) destptr; while (bytecount > 3) { *to32ptr++ = *from32ptr++; bytecount -= 4; } to8ptr = (u8 *) to32ptr; alignbuffer = *from32ptr++; from8ptr = (u8 *) & alignbuffer; for (i = 0; i < bytecount; i++) { *to8ptr++ = *from8ptr++; } } static void xemaclite_alignedwrite (void *srcptr, u32 destptr, u32 bytecount) { u32 i; u32 alignbuffer; u32 *to32ptr = (u32 *) destptr; u32 *from32ptr; u8 *to8ptr; u8 *from8ptr; from32ptr = (u32 *) srcptr; while (bytecount > 3) { *to32ptr++ = *from32ptr++; bytecount -= 4; } alignbuffer = 0; to8ptr = (u8 *) & alignbuffer; from8ptr = (u8 *) from32ptr; for (i = 0; i < bytecount; i++) { *to8ptr++ = *from8ptr++; } *to32ptr++ = alignbuffer; } static void emaclite_halt(struct eth_device *dev) { debug ("eth_halt\n"); } static int emaclite_init(struct eth_device *dev, bd_t *bis) { debug ("EmacLite Initialization Started\n"); memset (&emaclite, 0, sizeof (xemaclite)); emaclite.baseaddress = dev->iobase; /* * TX - TX_PING & TX_PONG initialization */ /* Restart PING TX */ out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, 0); /* Copy MAC address */ xemaclite_alignedwrite (dev->enetaddr, emaclite.baseaddress, ENET_ADDR_LENGTH); /* Set the length */ out_be32 (emaclite.baseaddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH); /* Update the MAC address in the EMAC Lite */ out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, XEL_TSR_PROG_MAC_ADDR); /* Wait for EMAC Lite to finish with the MAC address update */ while ((in_be32 (emaclite.baseaddress + XEL_TSR_OFFSET) & XEL_TSR_PROG_MAC_ADDR) != 0) ; #ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG /* The same operation with PONG TX */ out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET, 0); xemaclite_alignedwrite (dev->enetaddr, emaclite.baseaddress + XEL_BUFFER_OFFSET, ENET_ADDR_LENGTH); out_be32 (emaclite.baseaddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH); out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET, XEL_TSR_PROG_MAC_ADDR); while ((in_be32 (emaclite.baseaddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET) & XEL_TSR_PROG_MAC_ADDR) != 0) ; #endif /* * RX - RX_PING & RX_PONG initialization */ /* Write out the value to flush the RX buffer */ out_be32 (emaclite.baseaddress + XEL_RSR_OFFSET, XEL_RSR_RECV_IE_MASK); #ifdef CONFIG_XILINX_EMACLITE_RX_PING_PONG out_be32 (emaclite.baseaddress + XEL_RSR_OFFSET + XEL_BUFFER_OFFSET, XEL_RSR_RECV_IE_MASK); #endif debug ("EmacLite Initialization complete\n"); return 0; } static int xemaclite_txbufferavailable (xemaclite *instanceptr) { u32 reg; u32 txpingbusy; u32 txpongbusy; /* * Read the other buffer register * and determine if the other buffer is available */ reg = in_be32 (instanceptr->baseaddress + instanceptr->nexttxbuffertouse + 0); txpingbusy = ((reg & XEL_TSR_XMIT_BUSY_MASK) == XEL_TSR_XMIT_BUSY_MASK); reg = in_be32 (instanceptr->baseaddress + (instanceptr->nexttxbuffertouse ^ XEL_TSR_OFFSET) + 0); txpongbusy = ((reg & XEL_TSR_XMIT_BUSY_MASK) == XEL_TSR_XMIT_BUSY_MASK); return (!(txpingbusy && txpongbusy)); } static int emaclite_send (struct eth_device *dev, volatile void *ptr, int len) { u32 reg; u32 baseaddress; u32 maxtry = 1000; if (len > ENET_MAX_MTU) len = ENET_MAX_MTU; while (!xemaclite_txbufferavailable (&emaclite) && maxtry) { udelay (10); maxtry--; } if (!maxtry) { printf ("Error: Timeout waiting for ethernet TX buffer\n"); /* Restart PING TX */ out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, 0); #ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET, 0); #endif return 0; } /* Determine the expected TX buffer address */ baseaddress = (emaclite.baseaddress + emaclite.nexttxbuffertouse); /* Determine if the expected buffer address is empty */ reg = in_be32 (baseaddress + XEL_TSR_OFFSET); if (((reg & XEL_TSR_XMIT_BUSY_MASK) == 0) && ((in_be32 ((baseaddress) + XEL_TSR_OFFSET) & XEL_TSR_XMIT_ACTIVE_MASK) == 0)) { #ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG emaclite.nexttxbuffertouse ^= XEL_BUFFER_OFFSET; #endif debug ("Send packet from 0x%x\n", baseaddress); /* Write the frame to the buffer */ xemaclite_alignedwrite ((void *) ptr, baseaddress, len); out_be32 (baseaddress + XEL_TPLR_OFFSET,(len & (XEL_TPLR_LENGTH_MASK_HI | XEL_TPLR_LENGTH_MASK_LO))); reg = in_be32 (baseaddress + XEL_TSR_OFFSET); reg |= XEL_TSR_XMIT_BUSY_MASK; if ((reg & XEL_TSR_XMIT_IE_MASK) != 0) { reg |= XEL_TSR_XMIT_ACTIVE_MASK; } out_be32 (baseaddress + XEL_TSR_OFFSET, reg); return 1; } #ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG /* Switch to second buffer */ baseaddress ^= XEL_BUFFER_OFFSET; /* Determine if the expected buffer address is empty */ reg = in_be32 (baseaddress + XEL_TSR_OFFSET); if (((reg & XEL_TSR_XMIT_BUSY_MASK) == 0) && ((in_be32 ((baseaddress) + XEL_TSR_OFFSET) & XEL_TSR_XMIT_ACTIVE_MASK) == 0)) { debug ("Send packet from 0x%x\n", baseaddress); /* Write the frame to the buffer */ xemaclite_alignedwrite ((void *) ptr, baseaddress, len); out_be32 (baseaddress + XEL_TPLR_OFFSET,(len & (XEL_TPLR_LENGTH_MASK_HI | XEL_TPLR_LENGTH_MASK_LO))); reg = in_be32 (baseaddress + XEL_TSR_OFFSET); reg |= XEL_TSR_XMIT_BUSY_MASK; if ((reg & XEL_TSR_XMIT_IE_MASK) != 0) { reg |= XEL_TSR_XMIT_ACTIVE_MASK; } out_be32 (baseaddress + XEL_TSR_OFFSET, reg); return 1; } #endif puts ("Error while sending frame\n"); return 0; } static int emaclite_recv(struct eth_device *dev) { u32 length; u32 reg; u32 baseaddress; baseaddress = emaclite.baseaddress + emaclite.nextrxbuffertouse; reg = in_be32 (baseaddress + XEL_RSR_OFFSET); debug ("Testing data at address 0x%x\n", baseaddress); if ((reg & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) { #ifdef CONFIG_XILINX_EMACLITE_RX_PING_PONG emaclite.nextrxbuffertouse ^= XEL_BUFFER_OFFSET; #endif } else { #ifndef CONFIG_XILINX_EMACLITE_RX_PING_PONG debug ("No data was available - address 0x%x\n", baseaddress); return 0; #else baseaddress ^= XEL_BUFFER_OFFSET; reg = in_be32 (baseaddress + XEL_RSR_OFFSET); if ((reg & XEL_RSR_RECV_DONE_MASK) != XEL_RSR_RECV_DONE_MASK) { debug ("No data was available - address 0x%x\n", baseaddress); return 0; } #endif } /* Get the length of the frame that arrived */ switch(((ntohl(in_be32 (baseaddress + XEL_RXBUFF_OFFSET + 0xC))) & 0xFFFF0000 ) >> 16) { case 0x806: length = 42 + 20; /* FIXME size of ARP */ debug ("ARP Packet\n"); break; case 0x800: length = 14 + 14 + (((ntohl(in_be32 (baseaddress + XEL_RXBUFF_OFFSET + 0x10))) & 0xFFFF0000) >> 16); /* FIXME size of IP packet */ debug ("IP Packet\n"); break; default: debug ("Other Packet\n"); length = ENET_MAX_MTU; break; } xemaclite_alignedread ((u32 *) (baseaddress + XEL_RXBUFF_OFFSET), etherrxbuff, length); /* Acknowledge the frame */ reg = in_be32 (baseaddress + XEL_RSR_OFFSET); reg &= ~XEL_RSR_RECV_DONE_MASK; out_be32 (baseaddress + XEL_RSR_OFFSET, reg); debug ("Packet receive from 0x%x, length %dB\n", baseaddress, length); NetReceive ((uchar *) etherrxbuff, length); return 1; } int xilinx_emaclite_initialize (bd_t *bis, int base_addr) { struct eth_device *dev; dev = malloc(sizeof(*dev)); if (dev == NULL) hang(); memset(dev, 0, sizeof(*dev)); sprintf(dev->name, "Xilinx_Emaclite"); dev->iobase = base_addr; dev->priv = 0; dev->init = emaclite_init; dev->halt = emaclite_halt; dev->send = emaclite_send; dev->recv = emaclite_recv; eth_register(dev); return 0; }