2 * Cirrus Logic CS8900A Ethernet
4 * (C) 2009 Ben Warren , biggerbadderben@gmail.com
5 * Converted to use CONFIG_NET_MULTI API
7 * (C) 2003 Wolfgang Denk, wd@denx.de
8 * Extension to synchronize ethaddr environment variable
9 * against value in EEPROM
12 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
13 * Marius Groeger <mgroeger@sysgo.de>
15 * Copyright (C) 1999 Ben Williamson <benw@pobox.com>
17 * See file CREDITS for list of people who contributed to this
20 * This program is loaded into SRAM in bootstrap mode, where it waits
21 * for commands on UART1 to read and write memory, jump to code etc.
22 * A design goal for this program is to be entirely independent of the
23 * target board. Anything with a CL-PS7111 or EP7211 should be able to run
24 * this code in bootstrap mode. All the board specifics can be handled on
27 * This program is free software; you can redistribute it and/or modify
28 * it under the terms of the GNU General Public License as published by
29 * the Free Software Foundation; either version 2 of the License, or
30 * (at your option) any later version.
32 * This program is distributed in the hope that it will be useful,
33 * but WITHOUT ANY WARRANTY; without even the implied warranty of
34 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
35 * GNU General Public License for more details.
37 * You should have received a copy of the GNU General Public License
38 * along with this program; if not, write to the Free Software
39 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
51 /* packet page register access functions */
53 #ifdef CONFIG_CS8900_BUS32
55 #define REG_WRITE(v, a) writel((v),(a))
56 #define REG_READ(a) readl((a))
58 /* we don't need 16 bit initialisation on 32 bit bus */
59 #define get_reg_init_bus(r,d) get_reg((r),(d))
63 #define REG_WRITE(v, a) writew((v),(a))
64 #define REG_READ(a) readw((a))
66 static u16 get_reg_init_bus(struct eth_device *dev, int regno)
68 /* force 16 bit busmode */
70 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
71 uint8_t volatile * const iob = (uint8_t volatile * const)dev->iobase;
79 REG_WRITE(regno, &priv->regs->pptr);
80 return REG_READ(&priv->regs->pdata);
84 static u16 get_reg(struct eth_device *dev, int regno)
86 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
87 REG_WRITE(regno, &priv->regs->pptr);
88 return REG_READ(&priv->regs->pdata);
92 static void put_reg(struct eth_device *dev, int regno, u16 val)
94 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
95 REG_WRITE(regno, &priv->regs->pptr);
96 REG_WRITE(val, &priv->regs->pdata);
99 static void cs8900_reset(struct eth_device *dev)
105 put_reg(dev, PP_SelfCTL, get_reg(dev, PP_SelfCTL) | PP_SelfCTL_Reset);
109 /* Wait until the chip is reset */
111 tmo = get_timer(0) + 1 * CONFIG_SYS_HZ;
112 while ((((us = get_reg_init_bus(dev, PP_SelfSTAT)) &
113 PP_SelfSTAT_InitD) == 0) && tmo < get_timer(0))
117 static void cs8900_reginit(struct eth_device *dev)
119 /* receive only error free packets addressed to this card */
120 put_reg(dev, PP_RxCTL,
121 PP_RxCTL_IA | PP_RxCTL_Broadcast | PP_RxCTL_RxOK);
122 /* do not generate any interrupts on receive operations */
123 put_reg(dev, PP_RxCFG, 0);
124 /* do not generate any interrupts on transmit operations */
125 put_reg(dev, PP_TxCFG, 0);
126 /* do not generate any interrupts on buffer operations */
127 put_reg(dev, PP_BufCFG, 0);
128 /* enable transmitter/receiver mode */
129 put_reg(dev, PP_LineCTL, PP_LineCTL_Rx | PP_LineCTL_Tx);
132 void cs8900_get_enetaddr(struct eth_device *dev)
137 if (get_reg_init_bus(dev, PP_ChipID) != 0x630e)
140 if ((get_reg(dev, PP_SelfSTAT) &
141 (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) ==
142 (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) {
144 /* Load the MAC from EEPROM */
145 for (i = 0; i < 3; i++) {
148 Addr = get_reg(dev, PP_IA + i * 2);
149 dev->enetaddr[i * 2] = Addr & 0xFF;
150 dev->enetaddr[i * 2 + 1] = Addr >> 8;
155 void cs8900_halt(struct eth_device *dev)
157 /* disable transmitter/receiver mode */
158 put_reg(dev, PP_LineCTL, 0);
160 /* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */
161 get_reg_init_bus(dev, PP_ChipID);
164 static int cs8900_init(struct eth_device *dev, bd_t * bd)
166 uchar *enetaddr = dev->enetaddr;
170 id = get_reg_init_bus(dev, PP_ChipID);
172 printf ("CS8900 Ethernet chip not found: "
173 "ID=0x%04x instead 0x%04x\n", id, 0x630e);
178 /* set the ethernet address */
179 put_reg(dev, PP_IA + 0, enetaddr[0] | (enetaddr[1] << 8));
180 put_reg(dev, PP_IA + 2, enetaddr[2] | (enetaddr[3] << 8));
181 put_reg(dev, PP_IA + 4, enetaddr[4] | (enetaddr[5] << 8));
187 /* Get a data block via Ethernet */
188 static int cs8900_recv(struct eth_device *dev)
195 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
197 status = get_reg(dev, PP_RER);
199 if ((status & PP_RER_RxOK) == 0)
202 status = REG_READ(&priv->regs->rtdata);
203 rxlen = REG_READ(&priv->regs->rtdata);
205 if (rxlen > PKTSIZE_ALIGN + PKTALIGN)
206 debug("packet too big!\n");
207 for (addr = (u16 *) NetRxPackets[0], i = rxlen >> 1; i > 0;
209 *addr++ = REG_READ(&priv->regs->rtdata);
211 *addr++ = REG_READ(&priv->regs->rtdata);
213 /* Pass the packet up to the protocol layers. */
214 NetReceive (NetRxPackets[0], rxlen);
218 /* Send a data block via Ethernet. */
219 static int cs8900_send(struct eth_device *dev,
220 volatile void *packet, int length)
225 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
228 /* initiate a transmit sequence */
229 REG_WRITE(PP_TxCmd_TxStart_Full, &priv->regs->txcmd);
230 REG_WRITE(length, &priv->regs->txlen);
232 /* Test to see if the chip has allocated memory for the packet */
233 if ((get_reg(dev, PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) {
234 /* Oops... this should not happen! */
235 debug("cs: unable to send packet; retrying...\n");
236 for (tmo = get_timer(0) + 5 * CONFIG_SYS_HZ;
244 /* Write the contents of the packet */
245 /* assume even number of bytes */
246 for (addr = packet; length > 0; length -= 2)
247 REG_WRITE(*addr++, &priv->regs->rtdata);
249 /* wait for transfer to succeed */
250 tmo = get_timer(0) + 5 * CONFIG_SYS_HZ;
251 while ((s = get_reg(dev, PP_TER) & ~0x1F) == 0) {
252 if (get_timer(0) >= tmo)
257 if((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) {
258 debug("\ntransmission error %#x\n", s);
264 static void cs8900_e2prom_ready(struct eth_device *dev)
266 while (get_reg(dev, PP_SelfSTAT) & SI_BUSY)
270 /***********************************************************/
271 /* read a 16-bit word out of the EEPROM */
272 /***********************************************************/
274 int cs8900_e2prom_read(struct eth_device *dev,
277 cs8900_e2prom_ready(dev);
278 put_reg(dev, PP_EECMD, EEPROM_READ_CMD | addr);
279 cs8900_e2prom_ready(dev);
280 *value = get_reg(dev, PP_EEData);
286 /***********************************************************/
287 /* write a 16-bit word into the EEPROM */
288 /***********************************************************/
290 int cs8900_e2prom_write(struct eth_device *dev, u8 addr, u16 value)
292 cs8900_e2prom_ready(dev);
293 put_reg(dev, PP_EECMD, EEPROM_WRITE_EN);
294 cs8900_e2prom_ready(dev);
295 put_reg(dev, PP_EEData, value);
296 put_reg(dev, PP_EECMD, EEPROM_WRITE_CMD | addr);
297 cs8900_e2prom_ready(dev);
298 put_reg(dev, PP_EECMD, EEPROM_WRITE_DIS);
299 cs8900_e2prom_ready(dev);
304 int cs8900_initialize(u8 dev_num, int base_addr)
306 struct eth_device *dev;
307 struct cs8900_priv *priv;
309 dev = malloc(sizeof(*dev));
313 memset(dev, 0, sizeof(*dev));
315 priv = malloc(sizeof(*priv));
320 memset(priv, 0, sizeof(*priv));
321 priv->regs = (struct cs8900_regs *)base_addr;
323 dev->iobase = base_addr;
325 dev->init = cs8900_init;
326 dev->halt = cs8900_halt;
327 dev->send = cs8900_send;
328 dev->recv = cs8900_recv;
330 /* Load MAC address from EEPROM */
331 cs8900_get_enetaddr(dev);
333 sprintf(dev->name, "%s-%hu", CS8900_DRIVERNAME, dev_num);