Initial revision
diff --git a/drivers/cs8900.c b/drivers/cs8900.c
new file mode 100644
index 0000000..ecc7c13
--- /dev/null
+++ b/drivers/cs8900.c
@@ -0,0 +1,235 @@
+/*
+ * Cirrus Logic CS8900A Ethernet
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * Copyright (C) 1999 Ben Williamson <benw@pobox.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is loaded into SRAM in bootstrap mode, where it waits
+ * for commands on UART1 to read and write memory, jump to code etc.
+ * A design goal for this program is to be entirely independent of the
+ * target board. Anything with a CL-PS7111 or EP7211 should be able to run
+ * this code in bootstrap mode. All the board specifics can be handled on
+ * the host.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <common.h>
+#include <command.h>
+#include "cs8900.h"
+#include <net.h>
+
+#ifdef CONFIG_DRIVER_CS8900
+
+#if (CONFIG_COMMANDS & CFG_CMD_NET)
+
+
+/* packet page register access functions */
+
+#ifdef CS8900_BUS32
+/* we don't need 16 bit initialisation on 32 bit bus */
+#define get_reg_init_bus(x) get_reg((x))
+#else
+static unsigned short get_reg_init_bus(int regno)
+{
+ /* force 16 bit busmode */
+ volatile unsigned char c;
+ c = CS8900_BUS16_0;
+ c = CS8900_BUS16_1;
+ c = CS8900_BUS16_0;
+ c = CS8900_BUS16_1;
+ c = CS8900_BUS16_0;
+
+ CS8900_PPTR = regno;
+ return (unsigned short) CS8900_PDATA;
+}
+#endif
+
+static unsigned short
+get_reg(int regno)
+{
+ CS8900_PPTR = regno;
+ return (unsigned short) CS8900_PDATA;
+}
+
+
+static void put_reg(int regno, unsigned short val)
+{
+ CS8900_PPTR = regno;
+ CS8900_PDATA = val;
+}
+
+static void eth_reset(void)
+{
+ int tmo;
+ unsigned short us;
+
+ /* reset NIC */
+ put_reg(PP_SelfCTL, get_reg(PP_SelfCTL) | PP_SelfCTL_Reset );
+
+ /* wait for 200ms */
+ udelay(200000);
+ /* Wait until the chip is reset */
+
+ tmo = get_timer(0) + 1 * CFG_HZ;
+ while ((((us = get_reg_init_bus(PP_SelfSTAT)) & PP_SelfSTAT_InitD) == 0)
+ && tmo < get_timer(0))
+ /*NOP*/;
+}
+
+void cs8900_get_enetaddr (uchar *addr)
+{
+ int i;
+ /* verify chip id */
+ if (get_reg_init_bus(PP_ChipID) != 0x630e)
+ return;
+ eth_reset();
+ if ((get_reg(PP_SelfST) & (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) ==
+ (PP_SelfSTAT_EEPROM|PP_SelfSTAT_EEPROM_OK)) {
+ /* Load the MAC from EEPROM */
+ for (i=0; i<6/2; i++) {
+ unsigned int Addr;
+ Addr = get_reg(PP_IA+i*2);
+ addr[i*2] = Addr & 0xFF;
+ addr[i*2+1] = Addr >> 8;
+ }
+ }
+}
+
+void eth_halt( void )
+{
+ /* disable transmitter/receiver mode */
+ put_reg(PP_LineCTL, 0);
+
+ /* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */
+ get_reg_init_bus(PP_ChipID);
+}
+
+int eth_init( bd_t *bd )
+{
+
+ /* verify chip id */
+ if (get_reg_init_bus(PP_ChipID) != 0x630e)
+ {
+ printf( "CS8900 Ethernet chip not found?!\n" );
+ return 0;
+ }
+
+ eth_reset();
+ /* set the ethernet address */
+ put_reg(PP_IA + 0, bd->bi_enetaddr[0] | (bd->bi_enetaddr[1] << 8));
+ put_reg(PP_IA + 2, bd->bi_enetaddr[2] | (bd->bi_enetaddr[3] << 8));
+ put_reg(PP_IA + 4, bd->bi_enetaddr[4] | (bd->bi_enetaddr[5] << 8));
+
+ /* receive only error free packets addressed to this card */
+ put_reg(PP_RxCTL, PP_RxCTL_IA | PP_RxCTL_Broadcast | PP_RxCTL_RxOK);
+
+ /* do not generate any interrupts on receive operations */
+ put_reg(PP_RxCFG, 0);
+
+ /* do not generate any interrupts on transmit operations */
+ put_reg(PP_TxCFG, 0);
+
+ /* do not generate any interrupts on buffer operations */
+ put_reg(PP_BufCFG, 0);
+
+ /* enable transmitter/receiver mode */
+ put_reg(PP_LineCTL, PP_LineCTL_Rx | PP_LineCTL_Tx);
+
+ return 0;
+}
+
+/* Get a data block via Ethernet */
+extern int eth_rx(void)
+{
+ int i;
+ unsigned short rxlen;
+ unsigned short *addr;
+ unsigned short status;
+
+ status = get_reg(PP_RER);
+
+ if ((status & PP_RER_RxOK) == 0)
+ return 0;
+
+ status = CS8900_RTDATA; /* stat */
+ rxlen = CS8900_RTDATA; /* len */
+
+ if(rxlen > PKTSIZE_ALIGN + PKTALIGN)
+ printf("packet too big!\n");
+
+ for(addr = (unsigned short *)NetRxPackets[0], i = rxlen >> 1; i > 0; i-- )
+ *addr++ = CS8900_RTDATA;
+ if(rxlen & 1)
+ *addr++ = CS8900_RTDATA;
+
+ /* Pass the packet up to the protocol layers. */
+ NetReceive(NetRxPackets[0], rxlen);
+
+ return rxlen;
+}
+
+/* Send a data block via Ethernet. */
+extern int eth_send(volatile void *packet, int length)
+{
+ volatile unsigned short *addr;
+ int tmo;
+ unsigned short s;
+
+retry:
+ /* initiate a transmit sequence */
+ CS8900_TxCMD = PP_TxCmd_TxStart_Full;
+ CS8900_TxLEN = length;
+
+ /* Test to see if the chip has allocated memory for the packet */
+ if ((get_reg(PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) {
+ /* Oops... this should not happen! */
+ printf("cs: unable to send packet; retrying...\n");
+ for (tmo = get_timer(0) + 5 * CFG_HZ; get_timer(0) < tmo; )
+ /*NOP*/;
+ eth_reset();
+ goto retry;
+ }
+
+ /* Write the contents of the packet */
+ /* assume even number of bytes */
+ for(addr = packet; length > 0; length -= 2 )
+ CS8900_RTDATA = *addr++;
+
+ /* wait for transfer to succeed */
+ tmo = get_timer(0) + 5 * CFG_HZ;
+ while((s = get_reg(PP_TER) & ~0x1F) == 0)
+ {
+ if (get_timer(0) >= tmo)
+ break;
+ }
+
+ /* nothing */ ;
+ if ((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) {
+ printf("\ntransmission error %#x\n", s);
+ }
+
+ return 0;
+}
+
+#endif /* COMMANDS & CFG_NET */
+
+#endif /* CONFIG_DRIVER_CS8900 */