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 * This program is loaded into SRAM in bootstrap mode, where it waits
18 * for commands on UART1 to read and write memory, jump to code etc.
19 * A design goal for this program is to be entirely independent of the
20 * target board. Anything with a CL-PS7111 or EP7211 should be able to run
21 * this code in bootstrap mode. All the board specifics can be handled on
24 * SPDX-License-Identifier: GPL-2.0+
36 /* packet page register access functions */
38 #ifdef CONFIG_CS8900_BUS32
40 #define REG_WRITE(v, a) writel((v),(a))
41 #define REG_READ(a) readl((a))
43 /* we don't need 16 bit initialisation on 32 bit bus */
44 #define get_reg_init_bus(r,d) get_reg((r),(d))
48 #define REG_WRITE(v, a) writew((v),(a))
49 #define REG_READ(a) readw((a))
51 static u16 get_reg_init_bus(struct eth_device *dev, int regno)
53 /* force 16 bit busmode */
54 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
55 uint8_t volatile * const iob = (uint8_t volatile * const)dev->iobase;
63 REG_WRITE(regno, &priv->regs->pptr);
64 return REG_READ(&priv->regs->pdata);
68 static u16 get_reg(struct eth_device *dev, int regno)
70 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
71 REG_WRITE(regno, &priv->regs->pptr);
72 return REG_READ(&priv->regs->pdata);
76 static void put_reg(struct eth_device *dev, int regno, u16 val)
78 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
79 REG_WRITE(regno, &priv->regs->pptr);
80 REG_WRITE(val, &priv->regs->pdata);
83 static void cs8900_reset(struct eth_device *dev)
89 put_reg(dev, PP_SelfCTL, get_reg(dev, PP_SelfCTL) | PP_SelfCTL_Reset);
93 /* Wait until the chip is reset */
95 tmo = get_timer(0) + 1 * CONFIG_SYS_HZ;
96 while ((((us = get_reg_init_bus(dev, PP_SelfSTAT)) &
97 PP_SelfSTAT_InitD) == 0) && tmo < get_timer(0))
101 static void cs8900_reginit(struct eth_device *dev)
103 /* receive only error free packets addressed to this card */
104 put_reg(dev, PP_RxCTL,
105 PP_RxCTL_IA | PP_RxCTL_Broadcast | PP_RxCTL_RxOK);
106 /* do not generate any interrupts on receive operations */
107 put_reg(dev, PP_RxCFG, 0);
108 /* do not generate any interrupts on transmit operations */
109 put_reg(dev, PP_TxCFG, 0);
110 /* do not generate any interrupts on buffer operations */
111 put_reg(dev, PP_BufCFG, 0);
112 /* enable transmitter/receiver mode */
113 put_reg(dev, PP_LineCTL, PP_LineCTL_Rx | PP_LineCTL_Tx);
116 void cs8900_get_enetaddr(struct eth_device *dev)
121 if (get_reg_init_bus(dev, PP_ChipID) != 0x630e)
124 if ((get_reg(dev, PP_SelfSTAT) &
125 (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) ==
126 (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) {
128 /* Load the MAC from EEPROM */
129 for (i = 0; i < 3; i++) {
132 Addr = get_reg(dev, PP_IA + i * 2);
133 dev->enetaddr[i * 2] = Addr & 0xFF;
134 dev->enetaddr[i * 2 + 1] = Addr >> 8;
139 void cs8900_halt(struct eth_device *dev)
141 /* disable transmitter/receiver mode */
142 put_reg(dev, PP_LineCTL, 0);
144 /* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */
145 get_reg_init_bus(dev, PP_ChipID);
148 static int cs8900_init(struct eth_device *dev, bd_t * bd)
150 uchar *enetaddr = dev->enetaddr;
154 id = get_reg_init_bus(dev, PP_ChipID);
156 printf ("CS8900 Ethernet chip not found: "
157 "ID=0x%04x instead 0x%04x\n", id, 0x630e);
162 /* set the ethernet address */
163 put_reg(dev, PP_IA + 0, enetaddr[0] | (enetaddr[1] << 8));
164 put_reg(dev, PP_IA + 2, enetaddr[2] | (enetaddr[3] << 8));
165 put_reg(dev, PP_IA + 4, enetaddr[4] | (enetaddr[5] << 8));
171 /* Get a data block via Ethernet */
172 static int cs8900_recv(struct eth_device *dev)
179 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
181 status = get_reg(dev, PP_RER);
183 if ((status & PP_RER_RxOK) == 0)
186 status = REG_READ(&priv->regs->rtdata);
187 rxlen = REG_READ(&priv->regs->rtdata);
189 if (rxlen > PKTSIZE_ALIGN + PKTALIGN)
190 debug("packet too big!\n");
191 for (addr = (u16 *)net_rx_packets[0], i = rxlen >> 1; i > 0; i--)
192 *addr++ = REG_READ(&priv->regs->rtdata);
194 *addr++ = REG_READ(&priv->regs->rtdata);
196 /* Pass the packet up to the protocol layers. */
197 net_process_received_packet(net_rx_packets[0], rxlen);
201 /* Send a data block via Ethernet. */
202 static int cs8900_send(struct eth_device *dev, void *packet, int length)
207 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
210 /* initiate a transmit sequence */
211 REG_WRITE(PP_TxCmd_TxStart_Full, &priv->regs->txcmd);
212 REG_WRITE(length, &priv->regs->txlen);
214 /* Test to see if the chip has allocated memory for the packet */
215 if ((get_reg(dev, PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) {
216 /* Oops... this should not happen! */
217 debug("cs: unable to send packet; retrying...\n");
218 for (tmo = get_timer(0) + 5 * CONFIG_SYS_HZ;
226 /* Write the contents of the packet */
227 /* assume even number of bytes */
228 for (addr = packet; length > 0; length -= 2)
229 REG_WRITE(*addr++, &priv->regs->rtdata);
231 /* wait for transfer to succeed */
232 tmo = get_timer(0) + 5 * CONFIG_SYS_HZ;
233 while ((s = get_reg(dev, PP_TER) & ~0x1F) == 0) {
234 if (get_timer(0) >= tmo)
239 if((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) {
240 debug("\ntransmission error %#x\n", s);
246 static void cs8900_e2prom_ready(struct eth_device *dev)
248 while (get_reg(dev, PP_SelfSTAT) & SI_BUSY)
252 /***********************************************************/
253 /* read a 16-bit word out of the EEPROM */
254 /***********************************************************/
256 int cs8900_e2prom_read(struct eth_device *dev,
259 cs8900_e2prom_ready(dev);
260 put_reg(dev, PP_EECMD, EEPROM_READ_CMD | addr);
261 cs8900_e2prom_ready(dev);
262 *value = get_reg(dev, PP_EEData);
268 /***********************************************************/
269 /* write a 16-bit word into the EEPROM */
270 /***********************************************************/
272 int cs8900_e2prom_write(struct eth_device *dev, u8 addr, u16 value)
274 cs8900_e2prom_ready(dev);
275 put_reg(dev, PP_EECMD, EEPROM_WRITE_EN);
276 cs8900_e2prom_ready(dev);
277 put_reg(dev, PP_EEData, value);
278 put_reg(dev, PP_EECMD, EEPROM_WRITE_CMD | addr);
279 cs8900_e2prom_ready(dev);
280 put_reg(dev, PP_EECMD, EEPROM_WRITE_DIS);
281 cs8900_e2prom_ready(dev);
286 int cs8900_initialize(u8 dev_num, int base_addr)
288 struct eth_device *dev;
289 struct cs8900_priv *priv;
291 dev = malloc(sizeof(*dev));
295 memset(dev, 0, sizeof(*dev));
297 priv = malloc(sizeof(*priv));
302 memset(priv, 0, sizeof(*priv));
303 priv->regs = (struct cs8900_regs *)base_addr;
305 dev->iobase = base_addr;
307 dev->init = cs8900_init;
308 dev->halt = cs8900_halt;
309 dev->send = cs8900_send;
310 dev->recv = cs8900_recv;
312 /* Load MAC address from EEPROM */
313 cs8900_get_enetaddr(dev);
315 sprintf(dev->name, "%s-%hu", CS8900_DRIVERNAME, dev_num);