microblaze: add Emaclite ethernet driver
diff --git a/drivers/net/xilinx_emaclite.c b/drivers/net/xilinx_emaclite.c
new file mode 100644
index 0000000..9ba4096
--- /dev/null
+++ b/drivers/net/xilinx_emaclite.c
@@ -0,0 +1,351 @@
+/******************************************************************************
+ *
+ * XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
+ * AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
+ * SOLUTIONS FOR XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE,
+ * OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
+ * APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
+ * THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
+ * AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
+ * FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY
+ * WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
+ * IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
+ * REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
+ * INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE.
+ *
+ * (C) Copyright 2007-2008 Michal Simek
+ * Michal SIMEK <monstr@monstr.eu>
+ *
+ * (c) Copyright 2003 Xilinx Inc.
+ * All rights reserved.
+ *
+ ******************************************************************************/
+
+#include <common.h>
+#include <net.h>
+#include <config.h>
+#include <asm/io.h>
+
+#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 {
+ unsigned int baseaddress; /* Base address for device (IPIF) */
+ unsigned int nexttxbuffertouse; /* Next TX buffer to write to */
+ unsigned int nextrxbuffertouse; /* Next RX buffer to read from */
+ unsigned char deviceid; /* Unique ID of device - for future */
+} xemaclite;
+
+static xemaclite emaclite;
+
+static char etherrxbuff[PKTSIZE_ALIGN/4]; /* Receive buffer */
+
+/* hardcoded MAC address for the Xilinx EMAC Core when env is nowhere*/
+#ifdef CFG_ENV_IS_NOWHERE
+static u8 emacaddr[ENET_ADDR_LENGTH] = { 0x00, 0x0a, 0x35, 0x00, 0x22, 0x01 };
+#else
+static u8 emacaddr[ENET_ADDR_LENGTH];
+#endif
+
+void xemaclite_alignedread (u32 * srcptr, void *destptr, unsigned bytecount)
+{
+ unsigned int 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++;
+ }
+}
+
+void xemaclite_alignedwrite (void *srcptr, u32 destptr, unsigned bytecount)
+{
+ unsigned 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;
+}
+
+void eth_halt (void)
+{
+ debug ("eth_halt\n");
+}
+
+int eth_init (bd_t * bis)
+{
+ debug ("EmacLite Initialization Started\n");
+ memset (&emaclite, 0, sizeof (xemaclite));
+ emaclite.baseaddress = XILINX_EMACLITE_BASEADDR;
+
+ if (!getenv("ethaddr")) {
+ memcpy(bis->bi_enetaddr, emacaddr, ENET_ADDR_LENGTH);
+ }
+
+/*
+ * TX - TX_PING & TX_PONG initialization
+ */
+ /* Restart PING TX */
+ out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, 0);
+ /* Copy MAC address */
+ xemaclite_alignedwrite (bis->bi_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 (bis->bi_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;
+}
+
+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));
+}
+
+int eth_send (volatile void *ptr, int len) {
+
+ unsigned int reg;
+ unsigned int baseaddress;
+
+ unsigned 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;
+}
+
+int eth_rx (void)
+{
+ unsigned int length;
+ unsigned int reg;
+ unsigned int 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(((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 +
+ (((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;
+
+}