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 */
69 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
70 uint8_t volatile * const iob = (uint8_t volatile * const)dev->iobase;
78 REG_WRITE(regno, &priv->regs->pptr);
79 return REG_READ(&priv->regs->pdata);
83 static u16 get_reg(struct eth_device *dev, int regno)
85 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
86 REG_WRITE(regno, &priv->regs->pptr);
87 return REG_READ(&priv->regs->pdata);
91 static void put_reg(struct eth_device *dev, int regno, u16 val)
93 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
94 REG_WRITE(regno, &priv->regs->pptr);
95 REG_WRITE(val, &priv->regs->pdata);
98 static void cs8900_reset(struct eth_device *dev)
104 put_reg(dev, PP_SelfCTL, get_reg(dev, PP_SelfCTL) | PP_SelfCTL_Reset);
108 /* Wait until the chip is reset */
110 tmo = get_timer(0) + 1 * CONFIG_SYS_HZ;
111 while ((((us = get_reg_init_bus(dev, PP_SelfSTAT)) &
112 PP_SelfSTAT_InitD) == 0) && tmo < get_timer(0))
116 static void cs8900_reginit(struct eth_device *dev)
118 /* receive only error free packets addressed to this card */
119 put_reg(dev, PP_RxCTL,
120 PP_RxCTL_IA | PP_RxCTL_Broadcast | PP_RxCTL_RxOK);
121 /* do not generate any interrupts on receive operations */
122 put_reg(dev, PP_RxCFG, 0);
123 /* do not generate any interrupts on transmit operations */
124 put_reg(dev, PP_TxCFG, 0);
125 /* do not generate any interrupts on buffer operations */
126 put_reg(dev, PP_BufCFG, 0);
127 /* enable transmitter/receiver mode */
128 put_reg(dev, PP_LineCTL, PP_LineCTL_Rx | PP_LineCTL_Tx);
131 void cs8900_get_enetaddr(struct eth_device *dev)
136 if (get_reg_init_bus(dev, PP_ChipID) != 0x630e)
139 if ((get_reg(dev, PP_SelfSTAT) &
140 (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) ==
141 (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) {
143 /* Load the MAC from EEPROM */
144 for (i = 0; i < 3; i++) {
147 Addr = get_reg(dev, PP_IA + i * 2);
148 dev->enetaddr[i * 2] = Addr & 0xFF;
149 dev->enetaddr[i * 2 + 1] = Addr >> 8;
154 void cs8900_halt(struct eth_device *dev)
156 /* disable transmitter/receiver mode */
157 put_reg(dev, PP_LineCTL, 0);
159 /* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */
160 get_reg_init_bus(dev, PP_ChipID);
163 static int cs8900_init(struct eth_device *dev, bd_t * bd)
165 uchar *enetaddr = dev->enetaddr;
169 id = get_reg_init_bus(dev, PP_ChipID);
171 printf ("CS8900 Ethernet chip not found: "
172 "ID=0x%04x instead 0x%04x\n", id, 0x630e);
177 /* set the ethernet address */
178 put_reg(dev, PP_IA + 0, enetaddr[0] | (enetaddr[1] << 8));
179 put_reg(dev, PP_IA + 2, enetaddr[2] | (enetaddr[3] << 8));
180 put_reg(dev, PP_IA + 4, enetaddr[4] | (enetaddr[5] << 8));
186 /* Get a data block via Ethernet */
187 static int cs8900_recv(struct eth_device *dev)
194 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
196 status = get_reg(dev, PP_RER);
198 if ((status & PP_RER_RxOK) == 0)
201 status = REG_READ(&priv->regs->rtdata);
202 rxlen = REG_READ(&priv->regs->rtdata);
204 if (rxlen > PKTSIZE_ALIGN + PKTALIGN)
205 debug("packet too big!\n");
206 for (addr = (u16 *) NetRxPackets[0], i = rxlen >> 1; i > 0;
208 *addr++ = REG_READ(&priv->regs->rtdata);
210 *addr++ = REG_READ(&priv->regs->rtdata);
212 /* Pass the packet up to the protocol layers. */
213 NetReceive (NetRxPackets[0], rxlen);
217 /* Send a data block via Ethernet. */
218 static int cs8900_send(struct eth_device *dev, void *packet, int length)
223 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
226 /* initiate a transmit sequence */
227 REG_WRITE(PP_TxCmd_TxStart_Full, &priv->regs->txcmd);
228 REG_WRITE(length, &priv->regs->txlen);
230 /* Test to see if the chip has allocated memory for the packet */
231 if ((get_reg(dev, PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) {
232 /* Oops... this should not happen! */
233 debug("cs: unable to send packet; retrying...\n");
234 for (tmo = get_timer(0) + 5 * CONFIG_SYS_HZ;
242 /* Write the contents of the packet */
243 /* assume even number of bytes */
244 for (addr = packet; length > 0; length -= 2)
245 REG_WRITE(*addr++, &priv->regs->rtdata);
247 /* wait for transfer to succeed */
248 tmo = get_timer(0) + 5 * CONFIG_SYS_HZ;
249 while ((s = get_reg(dev, PP_TER) & ~0x1F) == 0) {
250 if (get_timer(0) >= tmo)
255 if((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) {
256 debug("\ntransmission error %#x\n", s);
262 static void cs8900_e2prom_ready(struct eth_device *dev)
264 while (get_reg(dev, PP_SelfSTAT) & SI_BUSY)
268 /***********************************************************/
269 /* read a 16-bit word out of the EEPROM */
270 /***********************************************************/
272 int cs8900_e2prom_read(struct eth_device *dev,
275 cs8900_e2prom_ready(dev);
276 put_reg(dev, PP_EECMD, EEPROM_READ_CMD | addr);
277 cs8900_e2prom_ready(dev);
278 *value = get_reg(dev, PP_EEData);
284 /***********************************************************/
285 /* write a 16-bit word into the EEPROM */
286 /***********************************************************/
288 int cs8900_e2prom_write(struct eth_device *dev, u8 addr, u16 value)
290 cs8900_e2prom_ready(dev);
291 put_reg(dev, PP_EECMD, EEPROM_WRITE_EN);
292 cs8900_e2prom_ready(dev);
293 put_reg(dev, PP_EEData, value);
294 put_reg(dev, PP_EECMD, EEPROM_WRITE_CMD | addr);
295 cs8900_e2prom_ready(dev);
296 put_reg(dev, PP_EECMD, EEPROM_WRITE_DIS);
297 cs8900_e2prom_ready(dev);
302 int cs8900_initialize(u8 dev_num, int base_addr)
304 struct eth_device *dev;
305 struct cs8900_priv *priv;
307 dev = malloc(sizeof(*dev));
311 memset(dev, 0, sizeof(*dev));
313 priv = malloc(sizeof(*priv));
318 memset(priv, 0, sizeof(*priv));
319 priv->regs = (struct cs8900_regs *)base_addr;
321 dev->iobase = base_addr;
323 dev->init = cs8900_init;
324 dev->halt = cs8900_halt;
325 dev->send = cs8900_send;
326 dev->recv = cs8900_recv;
328 /* Load MAC address from EEPROM */
329 cs8900_get_enetaddr(dev);
331 sprintf(dev->name, "%s-%hu", CS8900_DRIVERNAME, dev_num);