2 * Ethernet driver for TI TMS320DM644x (DaVinci) chips.
4 * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
6 * Parts shamelessly stolen from TI's dm644x_emac.c. Original copyright
9 * ----------------------------------------------------------------------------
13 * TI DaVinci (DM644X) EMAC peripheral driver source for DV-EVM
15 * Copyright (C) 2005 Texas Instruments.
17 * ----------------------------------------------------------------------------
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 * ----------------------------------------------------------------------------
35 * ver. 1.0: Sep 2005, Anant Gole - Created EMAC version for uBoot.
36 * ver 1.1: Nov 2005, Anant Gole - Extended the RX logic for multiple descriptors
44 #include <asm/arch/emac_defs.h>
46 unsigned int emac_dbg = 0;
47 #define debug_emac(fmt,args...) if (emac_dbg) printf(fmt,##args)
49 static void davinci_eth_mdio_enable(void);
51 static int gen_init_phy(int phy_addr);
52 static int gen_is_phy_connected(int phy_addr);
53 static int gen_get_link_speed(int phy_addr);
54 static int gen_auto_negotiate(int phy_addr);
56 void eth_mdio_enable(void)
58 davinci_eth_mdio_enable();
61 static u_int8_t davinci_eth_mac_addr[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
64 * This function must be called before emac_open() if you want to override
65 * the default mac address.
67 void davinci_eth_set_mac_addr(const u_int8_t *addr)
71 for (i = 0; i < sizeof (davinci_eth_mac_addr); i++) {
72 davinci_eth_mac_addr[i] = addr[i];
77 static volatile emac_regs *adap_emac = (emac_regs *)EMAC_BASE_ADDR;
78 static volatile ewrap_regs *adap_ewrap = (ewrap_regs *)EMAC_WRAPPER_BASE_ADDR;
79 static volatile mdio_regs *adap_mdio = (mdio_regs *)EMAC_MDIO_BASE_ADDR;
81 /* EMAC descriptors */
82 static volatile emac_desc *emac_rx_desc = (emac_desc *)(EMAC_WRAPPER_RAM_ADDR + EMAC_RX_DESC_BASE);
83 static volatile emac_desc *emac_tx_desc = (emac_desc *)(EMAC_WRAPPER_RAM_ADDR + EMAC_TX_DESC_BASE);
84 static volatile emac_desc *emac_rx_active_head = 0;
85 static volatile emac_desc *emac_rx_active_tail = 0;
86 static int emac_rx_queue_active = 0;
88 /* Receive packet buffers */
89 static unsigned char emac_rx_buffers[EMAC_MAX_RX_BUFFERS * (EMAC_MAX_ETHERNET_PKT_SIZE + EMAC_PKT_ALIGN)];
91 /* PHY address for a discovered PHY (0xff - not found) */
92 static volatile u_int8_t active_phy_addr = 0xff;
96 static void davinci_eth_mdio_enable(void)
100 clkdiv = (EMAC_MDIO_BUS_FREQ / EMAC_MDIO_CLOCK_FREQ) - 1;
102 adap_mdio->CONTROL = (clkdiv & 0xff) |
103 MDIO_CONTROL_ENABLE |
105 MDIO_CONTROL_FAULT_ENABLE;
107 while (adap_mdio->CONTROL & MDIO_CONTROL_IDLE) {;}
111 * Tries to find an active connected PHY. Returns 1 if address if found.
112 * If no active PHY (or more than one PHY) found returns 0.
113 * Sets active_phy_addr variable.
115 static int davinci_eth_phy_detect(void)
117 u_int32_t phy_act_state;
120 active_phy_addr = 0xff;
122 if ((phy_act_state = adap_mdio->ALIVE) == 0)
123 return(0); /* No active PHYs */
125 debug_emac("davinci_eth_phy_detect(), ALIVE = 0x%08x\n", phy_act_state);
127 for (i = 0; i < 32; i++) {
128 if (phy_act_state & (1 << i)) {
129 if (phy_act_state & ~(1 << i))
130 return(0); /* More than one PHY */
138 return(0); /* Just to make GCC happy */
142 /* Read a PHY register via MDIO inteface. Returns 1 on success, 0 otherwise */
143 int davinci_eth_phy_read(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t *data)
147 while (adap_mdio->USERACCESS0 & MDIO_USERACCESS0_GO) {;}
149 adap_mdio->USERACCESS0 = MDIO_USERACCESS0_GO |
150 MDIO_USERACCESS0_WRITE_READ |
151 ((reg_num & 0x1f) << 21) |
152 ((phy_addr & 0x1f) << 16);
154 /* Wait for command to complete */
155 while ((tmp = adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO) {;}
157 if (tmp & MDIO_USERACCESS0_ACK) {
158 *data = tmp & 0xffff;
166 /* Write to a PHY register via MDIO inteface. Blocks until operation is complete. */
167 int davinci_eth_phy_write(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t data)
170 while (adap_mdio->USERACCESS0 & MDIO_USERACCESS0_GO) {;}
172 adap_mdio->USERACCESS0 = MDIO_USERACCESS0_GO |
173 MDIO_USERACCESS0_WRITE_WRITE |
174 ((reg_num & 0x1f) << 21) |
175 ((phy_addr & 0x1f) << 16) |
178 /* Wait for command to complete */
179 while (adap_mdio->USERACCESS0 & MDIO_USERACCESS0_GO) {;}
184 /* PHY functions for a generic PHY */
185 static int gen_init_phy(int phy_addr)
189 if (gen_get_link_speed(phy_addr)) {
190 /* Try another time */
191 ret = gen_get_link_speed(phy_addr);
197 static int gen_is_phy_connected(int phy_addr)
201 return(davinci_eth_phy_read(phy_addr, PHY_PHYIDR1, &dummy));
204 static int gen_get_link_speed(int phy_addr)
208 if (davinci_eth_phy_read(phy_addr, MII_STATUS_REG, &tmp) && (tmp & 0x04))
214 static int gen_auto_negotiate(int phy_addr)
218 if (!davinci_eth_phy_read(phy_addr, PHY_BMCR, &tmp))
221 /* Restart Auto_negotiation */
222 tmp |= PHY_BMCR_AUTON;
223 davinci_eth_phy_write(phy_addr, PHY_BMCR, tmp);
225 /*check AutoNegotiate complete */
227 if (!davinci_eth_phy_read(phy_addr, PHY_BMSR, &tmp))
230 if (!(tmp & PHY_BMSR_AUTN_COMP))
233 return(gen_get_link_speed(phy_addr));
235 /* End of generic PHY functions */
238 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
239 static int davinci_mii_phy_read(char *devname, unsigned char addr, unsigned char reg, unsigned short *value)
241 return(davinci_eth_phy_read(addr, reg, value) ? 0 : 1);
244 static int davinci_mii_phy_write(char *devname, unsigned char addr, unsigned char reg, unsigned short value)
246 return(davinci_eth_phy_write(addr, reg, value) ? 0 : 1);
252 /* Eth device open */
253 static int davinci_eth_open(struct eth_device *dev, bd_t *bis)
256 u_int32_t clkdiv, cnt;
257 volatile emac_desc *rx_desc;
259 debug_emac("+ emac_open\n");
261 /* Reset EMAC module and disable interrupts in wrapper */
262 adap_emac->SOFTRESET = 1;
263 while (adap_emac->SOFTRESET != 0) {;}
264 adap_ewrap->EWCTL = 0;
265 for (cnt = 0; cnt < 5; cnt++) {
266 clkdiv = adap_ewrap->EWCTL;
269 rx_desc = emac_rx_desc;
271 adap_emac->TXCONTROL = 0x01;
272 adap_emac->RXCONTROL = 0x01;
274 /* Set MAC Addresses & Init multicast Hash to 0 (disable any multicast receive) */
275 /* Using channel 0 only - other channels are disabled */
276 adap_emac->MACINDEX = 0;
277 adap_emac->MACADDRHI =
278 (davinci_eth_mac_addr[3] << 24) |
279 (davinci_eth_mac_addr[2] << 16) |
280 (davinci_eth_mac_addr[1] << 8) |
281 (davinci_eth_mac_addr[0]);
282 adap_emac->MACADDRLO =
283 (davinci_eth_mac_addr[5] << 8) |
284 (davinci_eth_mac_addr[4]);
286 adap_emac->MACHASH1 = 0;
287 adap_emac->MACHASH2 = 0;
289 /* Set source MAC address - REQUIRED */
290 adap_emac->MACSRCADDRHI =
291 (davinci_eth_mac_addr[3] << 24) |
292 (davinci_eth_mac_addr[2] << 16) |
293 (davinci_eth_mac_addr[1] << 8) |
294 (davinci_eth_mac_addr[0]);
295 adap_emac->MACSRCADDRLO =
296 (davinci_eth_mac_addr[4] << 8) |
297 (davinci_eth_mac_addr[5]);
299 /* Set DMA 8 TX / 8 RX Head pointers to 0 */
300 addr = &adap_emac->TX0HDP;
301 for(cnt = 0; cnt < 16; cnt++)
304 addr = &adap_emac->RX0HDP;
305 for(cnt = 0; cnt < 16; cnt++)
308 /* Clear Statistics (do this before setting MacControl register) */
309 addr = &adap_emac->RXGOODFRAMES;
310 for(cnt = 0; cnt < EMAC_NUM_STATS; cnt++)
313 /* No multicast addressing */
314 adap_emac->MACHASH1 = 0;
315 adap_emac->MACHASH2 = 0;
317 /* Create RX queue and set receive process in place */
318 emac_rx_active_head = emac_rx_desc;
319 for (cnt = 0; cnt < EMAC_MAX_RX_BUFFERS; cnt++) {
320 rx_desc->next = (u_int32_t)(rx_desc + 1);
321 rx_desc->buffer = &emac_rx_buffers[cnt * (EMAC_MAX_ETHERNET_PKT_SIZE + EMAC_PKT_ALIGN)];
322 rx_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
323 rx_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
327 /* Set the last descriptor's "next" parameter to 0 to end the RX desc list */
330 emac_rx_active_tail = rx_desc;
331 emac_rx_queue_active = 1;
334 adap_emac->RXMAXLEN = EMAC_MAX_ETHERNET_PKT_SIZE;
335 adap_emac->RXBUFFEROFFSET = 0;
337 /* No fancy configs - Use this for promiscous for debug - EMAC_RXMBPENABLE_RXCAFEN_ENABLE */
338 adap_emac->RXMBPENABLE = EMAC_RXMBPENABLE_RXBROADEN;
340 /* Enable ch 0 only */
341 adap_emac->RXUNICASTSET = 0x01;
343 /* Enable MII interface and Full duplex mode */
344 adap_emac->MACCONTROL = (EMAC_MACCONTROL_MIIEN_ENABLE | EMAC_MACCONTROL_FULLDUPLEX_ENABLE);
346 /* Init MDIO & get link state */
347 clkdiv = (EMAC_MDIO_BUS_FREQ / EMAC_MDIO_CLOCK_FREQ) - 1;
348 adap_mdio->CONTROL = ((clkdiv & 0xff) | MDIO_CONTROL_ENABLE | MDIO_CONTROL_FAULT);
350 if (!phy.get_link_speed(active_phy_addr))
353 /* Start receive process */
354 adap_emac->RX0HDP = (u_int32_t)emac_rx_desc;
356 debug_emac("- emac_open\n");
361 /* EMAC Channel Teardown */
362 static void davinci_eth_ch_teardown(int ch)
367 debug_emac("+ emac_ch_teardown\n");
369 if (ch == EMAC_CH_TX) {
370 /* Init TX channel teardown */
371 adap_emac->TXTEARDOWN = 1;
372 for(cnt = 0; cnt != 0xfffffffc; cnt = adap_emac->TX0CP) {
373 /* Wait here for Tx teardown completion interrupt to occur
374 * Note: A task delay can be called here to pend rather than
375 * occupying CPU cycles - anyway it has been found that teardown
376 * takes very few cpu cycles and does not affect functionality */
382 adap_emac->TX0CP = cnt;
383 adap_emac->TX0HDP = 0;
385 /* Init RX channel teardown */
386 adap_emac->RXTEARDOWN = 1;
387 for(cnt = 0; cnt != 0xfffffffc; cnt = adap_emac->RX0CP) {
388 /* Wait here for Rx teardown completion interrupt to occur
389 * Note: A task delay can be called here to pend rather than
390 * occupying CPU cycles - anyway it has been found that teardown
391 * takes very few cpu cycles and does not affect functionality */
397 adap_emac->RX0CP = cnt;
398 adap_emac->RX0HDP = 0;
401 debug_emac("- emac_ch_teardown\n");
404 /* Eth device close */
405 static void davinci_eth_close(struct eth_device *dev)
407 debug_emac("+ emac_close\n");
409 davinci_eth_ch_teardown(EMAC_CH_TX); /* TX Channel teardown */
410 davinci_eth_ch_teardown(EMAC_CH_RX); /* RX Channel teardown */
412 /* Reset EMAC module and disable interrupts in wrapper */
413 adap_emac->SOFTRESET = 1;
414 adap_ewrap->EWCTL = 0;
416 debug_emac("- emac_close\n");
419 static int tx_send_loop = 0;
422 * This function sends a single packet on the network and returns
423 * positive number (number of bytes transmitted) or negative for error
425 static int davinci_eth_send_packet (struct eth_device *dev,
426 volatile void *packet, int length)
432 /* Return error if no link */
433 if (!phy.get_link_speed (active_phy_addr)) {
434 printf ("WARN: emac_send_packet: No link\n");
438 /* Check packet size and if < EMAC_MIN_ETHERNET_PKT_SIZE, pad it up */
439 if (length < EMAC_MIN_ETHERNET_PKT_SIZE) {
440 length = EMAC_MIN_ETHERNET_PKT_SIZE;
443 /* Populate the TX descriptor */
444 emac_tx_desc->next = 0;
445 emac_tx_desc->buffer = (u_int8_t *) packet;
446 emac_tx_desc->buff_off_len = (length & 0xffff);
447 emac_tx_desc->pkt_flag_len = ((length & 0xffff) |
449 EMAC_CPPI_OWNERSHIP_BIT |
451 /* Send the packet */
452 adap_emac->TX0HDP = (unsigned int) emac_tx_desc;
454 /* Wait for packet to complete or link down */
456 if (!phy.get_link_speed (active_phy_addr)) {
457 davinci_eth_ch_teardown (EMAC_CH_TX);
460 if (adap_emac->TXINTSTATRAW & 0x01) {
471 * This function handles receipt of a packet from the network
473 static int davinci_eth_rcv_packet (struct eth_device *dev)
475 volatile emac_desc *rx_curr_desc;
476 volatile emac_desc *curr_desc;
477 volatile emac_desc *tail_desc;
478 int status, ret = -1;
480 rx_curr_desc = emac_rx_active_head;
481 status = rx_curr_desc->pkt_flag_len;
482 if ((rx_curr_desc) && ((status & EMAC_CPPI_OWNERSHIP_BIT) == 0)) {
483 if (status & EMAC_CPPI_RX_ERROR_FRAME) {
484 /* Error in packet - discard it and requeue desc */
485 printf ("WARN: emac_rcv_pkt: Error in packet\n");
487 NetReceive (rx_curr_desc->buffer,
488 (rx_curr_desc->buff_off_len & 0xffff));
489 ret = rx_curr_desc->buff_off_len & 0xffff;
492 /* Ack received packet descriptor */
493 adap_emac->RX0CP = (unsigned int) rx_curr_desc;
494 curr_desc = rx_curr_desc;
495 emac_rx_active_head =
496 (volatile emac_desc *) rx_curr_desc->next;
498 if (status & EMAC_CPPI_EOQ_BIT) {
499 if (emac_rx_active_head) {
501 (unsigned int) emac_rx_active_head;
503 emac_rx_queue_active = 0;
504 printf ("INFO:emac_rcv_packet: RX Queue not active\n");
508 /* Recycle RX descriptor */
509 rx_curr_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
510 rx_curr_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
511 rx_curr_desc->next = 0;
513 if (emac_rx_active_head == 0) {
514 printf ("INFO: emac_rcv_pkt: active queue head = 0\n");
515 emac_rx_active_head = curr_desc;
516 emac_rx_active_tail = curr_desc;
517 if (emac_rx_queue_active != 0) {
519 (unsigned int) emac_rx_active_head;
520 printf ("INFO: emac_rcv_pkt: active queue head = 0, HDP fired\n");
521 emac_rx_queue_active = 1;
524 tail_desc = emac_rx_active_tail;
525 emac_rx_active_tail = curr_desc;
526 tail_desc->next = (unsigned int) curr_desc;
527 status = tail_desc->pkt_flag_len;
528 if (status & EMAC_CPPI_EOQ_BIT) {
529 adap_emac->RX0HDP = (unsigned int) curr_desc;
530 status &= ~EMAC_CPPI_EOQ_BIT;
531 tail_desc->pkt_flag_len = status;
540 * This function initializes the emac hardware. It does NOT initialize
541 * EMAC modules power or pin multiplexors, that is done by board_init()
542 * much earlier in bootup process. Returns 1 on success, 0 otherwise.
544 int davinci_emac_initialize(void)
549 struct eth_device *dev;
551 dev = malloc(sizeof *dev);
556 memset(dev, 0, sizeof *dev);
559 dev->init = davinci_eth_open;
560 dev->halt = davinci_eth_close;
561 dev->send = davinci_eth_send_packet;
562 dev->recv = davinci_eth_rcv_packet;
566 davinci_eth_mdio_enable();
568 for (i = 0; i < 256; i++) {
569 if (adap_mdio->ALIVE)
575 printf("No ETH PHY detected!!!\n");
579 /* Find if a PHY is connected and get it's address */
580 if (!davinci_eth_phy_detect())
583 /* Get PHY ID and initialize phy_ops for a detected PHY */
584 if (!davinci_eth_phy_read(active_phy_addr, PHY_PHYIDR1, &tmp)) {
585 active_phy_addr = 0xff;
589 phy_id = (tmp << 16) & 0xffff0000;
591 if (!davinci_eth_phy_read(active_phy_addr, PHY_PHYIDR2, &tmp)) {
592 active_phy_addr = 0xff;
596 phy_id |= tmp & 0x0000ffff;
600 sprintf(phy.name, "LXT972 @ 0x%02x", active_phy_addr);
601 phy.init = lxt972_init_phy;
602 phy.is_phy_connected = lxt972_is_phy_connected;
603 phy.get_link_speed = lxt972_get_link_speed;
604 phy.auto_negotiate = lxt972_auto_negotiate;
607 sprintf(phy.name, "DP83848 @ 0x%02x", active_phy_addr);
608 phy.init = dp83848_init_phy;
609 phy.is_phy_connected = dp83848_is_phy_connected;
610 phy.get_link_speed = dp83848_get_link_speed;
611 phy.auto_negotiate = dp83848_auto_negotiate;
614 sprintf(phy.name, "GENERIC @ 0x%02x", active_phy_addr);
615 phy.init = gen_init_phy;
616 phy.is_phy_connected = gen_is_phy_connected;
617 phy.get_link_speed = gen_get_link_speed;
618 phy.auto_negotiate = gen_auto_negotiate;
621 printf("Ethernet PHY: %s\n", phy.name);
623 miiphy_register(phy.name, davinci_mii_phy_read, davinci_mii_phy_write);