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
43 #include <asm/arch/emac_defs.h>
45 unsigned int emac_dbg = 0;
46 #define debug_emac(fmt,args...) if (emac_dbg) printf(fmt,##args)
48 /* Internal static functions */
49 static int davinci_eth_hw_init (void);
50 static int davinci_eth_open (void);
51 static int davinci_eth_close (void);
52 static int davinci_eth_send_packet (volatile void *packet, int length);
53 static int davinci_eth_rcv_packet (void);
54 static void davinci_eth_mdio_enable(void);
56 static int gen_init_phy(int phy_addr);
57 static int gen_is_phy_connected(int phy_addr);
58 static int gen_get_link_speed(int phy_addr);
59 static int gen_auto_negotiate(int phy_addr);
61 /* Wrappers exported to the U-Boot proper */
64 return(davinci_eth_hw_init());
67 int eth_init(bd_t * bd)
69 return(davinci_eth_open());
77 int eth_send(volatile void *packet, int length)
79 return(davinci_eth_send_packet(packet, length));
84 return(davinci_eth_rcv_packet());
87 void eth_mdio_enable(void)
89 davinci_eth_mdio_enable();
94 static u_int8_t davinci_eth_mac_addr[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
97 * This function must be called before emac_open() if you want to override
98 * the default mac address.
100 void davinci_eth_set_mac_addr(const u_int8_t *addr)
104 for (i = 0; i < sizeof (davinci_eth_mac_addr); i++) {
105 davinci_eth_mac_addr[i] = addr[i];
110 static volatile emac_regs *adap_emac = (emac_regs *)EMAC_BASE_ADDR;
111 static volatile ewrap_regs *adap_ewrap = (ewrap_regs *)EMAC_WRAPPER_BASE_ADDR;
112 static volatile mdio_regs *adap_mdio = (mdio_regs *)EMAC_MDIO_BASE_ADDR;
114 /* EMAC descriptors */
115 static volatile emac_desc *emac_rx_desc = (emac_desc *)(EMAC_WRAPPER_RAM_ADDR + EMAC_RX_DESC_BASE);
116 static volatile emac_desc *emac_tx_desc = (emac_desc *)(EMAC_WRAPPER_RAM_ADDR + EMAC_TX_DESC_BASE);
117 static volatile emac_desc *emac_rx_active_head = 0;
118 static volatile emac_desc *emac_rx_active_tail = 0;
119 static int emac_rx_queue_active = 0;
121 /* Receive packet buffers */
122 static unsigned char emac_rx_buffers[EMAC_MAX_RX_BUFFERS * (EMAC_MAX_ETHERNET_PKT_SIZE + EMAC_PKT_ALIGN)];
124 /* PHY address for a discovered PHY (0xff - not found) */
125 static volatile u_int8_t active_phy_addr = 0xff;
129 static void davinci_eth_mdio_enable(void)
133 clkdiv = (EMAC_MDIO_BUS_FREQ / EMAC_MDIO_CLOCK_FREQ) - 1;
135 adap_mdio->CONTROL = (clkdiv & 0xff) |
136 MDIO_CONTROL_ENABLE |
138 MDIO_CONTROL_FAULT_ENABLE;
140 while (adap_mdio->CONTROL & MDIO_CONTROL_IDLE) {;}
144 * Tries to find an active connected PHY. Returns 1 if address if found.
145 * If no active PHY (or more than one PHY) found returns 0.
146 * Sets active_phy_addr variable.
148 static int davinci_eth_phy_detect(void)
150 u_int32_t phy_act_state;
153 active_phy_addr = 0xff;
155 if ((phy_act_state = adap_mdio->ALIVE) == 0)
156 return(0); /* No active PHYs */
158 debug_emac("davinci_eth_phy_detect(), ALIVE = 0x%08x\n", phy_act_state);
160 for (i = 0; i < 32; i++) {
161 if (phy_act_state & (1 << i)) {
162 if (phy_act_state & ~(1 << i))
163 return(0); /* More than one PHY */
171 return(0); /* Just to make GCC happy */
175 /* Read a PHY register via MDIO inteface. Returns 1 on success, 0 otherwise */
176 int davinci_eth_phy_read(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t *data)
180 while (adap_mdio->USERACCESS0 & MDIO_USERACCESS0_GO) {;}
182 adap_mdio->USERACCESS0 = MDIO_USERACCESS0_GO |
183 MDIO_USERACCESS0_WRITE_READ |
184 ((reg_num & 0x1f) << 21) |
185 ((phy_addr & 0x1f) << 16);
187 /* Wait for command to complete */
188 while ((tmp = adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO) {;}
190 if (tmp & MDIO_USERACCESS0_ACK) {
191 *data = tmp & 0xffff;
199 /* Write to a PHY register via MDIO inteface. Blocks until operation is complete. */
200 int davinci_eth_phy_write(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t data)
203 while (adap_mdio->USERACCESS0 & MDIO_USERACCESS0_GO) {;}
205 adap_mdio->USERACCESS0 = MDIO_USERACCESS0_GO |
206 MDIO_USERACCESS0_WRITE_WRITE |
207 ((reg_num & 0x1f) << 21) |
208 ((phy_addr & 0x1f) << 16) |
211 /* Wait for command to complete */
212 while (adap_mdio->USERACCESS0 & MDIO_USERACCESS0_GO) {;}
217 /* PHY functions for a generic PHY */
218 static int gen_init_phy(int phy_addr)
222 if (gen_get_link_speed(phy_addr)) {
223 /* Try another time */
224 ret = gen_get_link_speed(phy_addr);
230 static int gen_is_phy_connected(int phy_addr)
234 return(davinci_eth_phy_read(phy_addr, PHY_PHYIDR1, &dummy));
237 static int gen_get_link_speed(int phy_addr)
241 if (davinci_eth_phy_read(phy_addr, MII_STATUS_REG, &tmp) && (tmp & 0x04))
247 static int gen_auto_negotiate(int phy_addr)
251 if (!davinci_eth_phy_read(phy_addr, PHY_BMCR, &tmp))
254 /* Restart Auto_negotiation */
255 tmp |= PHY_BMCR_AUTON;
256 davinci_eth_phy_write(phy_addr, PHY_BMCR, tmp);
258 /*check AutoNegotiate complete */
260 if (!davinci_eth_phy_read(phy_addr, PHY_BMSR, &tmp))
263 if (!(tmp & PHY_BMSR_AUTN_COMP))
266 return(gen_get_link_speed(phy_addr));
268 /* End of generic PHY functions */
271 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
272 static int davinci_mii_phy_read(char *devname, unsigned char addr, unsigned char reg, unsigned short *value)
274 return(davinci_eth_phy_read(addr, reg, value) ? 0 : 1);
277 static int davinci_mii_phy_write(char *devname, unsigned char addr, unsigned char reg, unsigned short value)
279 return(davinci_eth_phy_write(addr, reg, value) ? 0 : 1);
282 int davinci_eth_miiphy_initialize(bd_t *bis)
284 miiphy_register(phy.name, davinci_mii_phy_read, davinci_mii_phy_write);
291 /* Eth device open */
292 static int davinci_eth_open(void)
295 u_int32_t clkdiv, cnt;
296 volatile emac_desc *rx_desc;
298 debug_emac("+ emac_open\n");
300 /* Reset EMAC module and disable interrupts in wrapper */
301 adap_emac->SOFTRESET = 1;
302 while (adap_emac->SOFTRESET != 0) {;}
303 adap_ewrap->EWCTL = 0;
304 for (cnt = 0; cnt < 5; cnt++) {
305 clkdiv = adap_ewrap->EWCTL;
308 rx_desc = emac_rx_desc;
310 adap_emac->TXCONTROL = 0x01;
311 adap_emac->RXCONTROL = 0x01;
313 /* Set MAC Addresses & Init multicast Hash to 0 (disable any multicast receive) */
314 /* Using channel 0 only - other channels are disabled */
315 adap_emac->MACINDEX = 0;
316 adap_emac->MACADDRHI =
317 (davinci_eth_mac_addr[3] << 24) |
318 (davinci_eth_mac_addr[2] << 16) |
319 (davinci_eth_mac_addr[1] << 8) |
320 (davinci_eth_mac_addr[0]);
321 adap_emac->MACADDRLO =
322 (davinci_eth_mac_addr[5] << 8) |
323 (davinci_eth_mac_addr[4]);
325 adap_emac->MACHASH1 = 0;
326 adap_emac->MACHASH2 = 0;
328 /* Set source MAC address - REQUIRED */
329 adap_emac->MACSRCADDRHI =
330 (davinci_eth_mac_addr[3] << 24) |
331 (davinci_eth_mac_addr[2] << 16) |
332 (davinci_eth_mac_addr[1] << 8) |
333 (davinci_eth_mac_addr[0]);
334 adap_emac->MACSRCADDRLO =
335 (davinci_eth_mac_addr[4] << 8) |
336 (davinci_eth_mac_addr[5]);
338 /* Set DMA 8 TX / 8 RX Head pointers to 0 */
339 addr = &adap_emac->TX0HDP;
340 for(cnt = 0; cnt < 16; cnt++)
343 addr = &adap_emac->RX0HDP;
344 for(cnt = 0; cnt < 16; cnt++)
347 /* Clear Statistics (do this before setting MacControl register) */
348 addr = &adap_emac->RXGOODFRAMES;
349 for(cnt = 0; cnt < EMAC_NUM_STATS; cnt++)
352 /* No multicast addressing */
353 adap_emac->MACHASH1 = 0;
354 adap_emac->MACHASH2 = 0;
356 /* Create RX queue and set receive process in place */
357 emac_rx_active_head = emac_rx_desc;
358 for (cnt = 0; cnt < EMAC_MAX_RX_BUFFERS; cnt++) {
359 rx_desc->next = (u_int32_t)(rx_desc + 1);
360 rx_desc->buffer = &emac_rx_buffers[cnt * (EMAC_MAX_ETHERNET_PKT_SIZE + EMAC_PKT_ALIGN)];
361 rx_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
362 rx_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
366 /* Set the last descriptor's "next" parameter to 0 to end the RX desc list */
369 emac_rx_active_tail = rx_desc;
370 emac_rx_queue_active = 1;
373 adap_emac->RXMAXLEN = EMAC_MAX_ETHERNET_PKT_SIZE;
374 adap_emac->RXBUFFEROFFSET = 0;
376 /* No fancy configs - Use this for promiscous for debug - EMAC_RXMBPENABLE_RXCAFEN_ENABLE */
377 adap_emac->RXMBPENABLE = EMAC_RXMBPENABLE_RXBROADEN;
379 /* Enable ch 0 only */
380 adap_emac->RXUNICASTSET = 0x01;
382 /* Enable MII interface and Full duplex mode */
383 adap_emac->MACCONTROL = (EMAC_MACCONTROL_MIIEN_ENABLE | EMAC_MACCONTROL_FULLDUPLEX_ENABLE);
385 /* Init MDIO & get link state */
386 clkdiv = (EMAC_MDIO_BUS_FREQ / EMAC_MDIO_CLOCK_FREQ) - 1;
387 adap_mdio->CONTROL = ((clkdiv & 0xff) | MDIO_CONTROL_ENABLE | MDIO_CONTROL_FAULT);
389 if (!phy.get_link_speed(active_phy_addr))
392 /* Start receive process */
393 adap_emac->RX0HDP = (u_int32_t)emac_rx_desc;
395 debug_emac("- emac_open\n");
400 /* EMAC Channel Teardown */
401 static void davinci_eth_ch_teardown(int ch)
406 debug_emac("+ emac_ch_teardown\n");
408 if (ch == EMAC_CH_TX) {
409 /* Init TX channel teardown */
410 adap_emac->TXTEARDOWN = 1;
411 for(cnt = 0; cnt != 0xfffffffc; cnt = adap_emac->TX0CP) {
412 /* Wait here for Tx teardown completion interrupt to occur
413 * Note: A task delay can be called here to pend rather than
414 * occupying CPU cycles - anyway it has been found that teardown
415 * takes very few cpu cycles and does not affect functionality */
421 adap_emac->TX0CP = cnt;
422 adap_emac->TX0HDP = 0;
424 /* Init RX channel teardown */
425 adap_emac->RXTEARDOWN = 1;
426 for(cnt = 0; cnt != 0xfffffffc; cnt = adap_emac->RX0CP) {
427 /* Wait here for Rx teardown completion interrupt to occur
428 * Note: A task delay can be called here to pend rather than
429 * occupying CPU cycles - anyway it has been found that teardown
430 * takes very few cpu cycles and does not affect functionality */
436 adap_emac->RX0CP = cnt;
437 adap_emac->RX0HDP = 0;
440 debug_emac("- emac_ch_teardown\n");
443 /* Eth device close */
444 static int davinci_eth_close(void)
446 debug_emac("+ emac_close\n");
448 davinci_eth_ch_teardown(EMAC_CH_TX); /* TX Channel teardown */
449 davinci_eth_ch_teardown(EMAC_CH_RX); /* RX Channel teardown */
451 /* Reset EMAC module and disable interrupts in wrapper */
452 adap_emac->SOFTRESET = 1;
453 adap_ewrap->EWCTL = 0;
455 debug_emac("- emac_close\n");
459 static int tx_send_loop = 0;
462 * This function sends a single packet on the network and returns
463 * positive number (number of bytes transmitted) or negative for error
465 static int davinci_eth_send_packet (volatile void *packet, int length)
471 /* Return error if no link */
472 if (!phy.get_link_speed (active_phy_addr)) {
473 printf ("WARN: emac_send_packet: No link\n");
477 /* Check packet size and if < EMAC_MIN_ETHERNET_PKT_SIZE, pad it up */
478 if (length < EMAC_MIN_ETHERNET_PKT_SIZE) {
479 length = EMAC_MIN_ETHERNET_PKT_SIZE;
482 /* Populate the TX descriptor */
483 emac_tx_desc->next = 0;
484 emac_tx_desc->buffer = (u_int8_t *) packet;
485 emac_tx_desc->buff_off_len = (length & 0xffff);
486 emac_tx_desc->pkt_flag_len = ((length & 0xffff) |
488 EMAC_CPPI_OWNERSHIP_BIT |
490 /* Send the packet */
491 adap_emac->TX0HDP = (unsigned int) emac_tx_desc;
493 /* Wait for packet to complete or link down */
495 if (!phy.get_link_speed (active_phy_addr)) {
496 davinci_eth_ch_teardown (EMAC_CH_TX);
499 if (adap_emac->TXINTSTATRAW & 0x01) {
510 * This function handles receipt of a packet from the network
512 static int davinci_eth_rcv_packet (void)
514 volatile emac_desc *rx_curr_desc;
515 volatile emac_desc *curr_desc;
516 volatile emac_desc *tail_desc;
517 int status, ret = -1;
519 rx_curr_desc = emac_rx_active_head;
520 status = rx_curr_desc->pkt_flag_len;
521 if ((rx_curr_desc) && ((status & EMAC_CPPI_OWNERSHIP_BIT) == 0)) {
522 if (status & EMAC_CPPI_RX_ERROR_FRAME) {
523 /* Error in packet - discard it and requeue desc */
524 printf ("WARN: emac_rcv_pkt: Error in packet\n");
526 NetReceive (rx_curr_desc->buffer,
527 (rx_curr_desc->buff_off_len & 0xffff));
528 ret = rx_curr_desc->buff_off_len & 0xffff;
531 /* Ack received packet descriptor */
532 adap_emac->RX0CP = (unsigned int) rx_curr_desc;
533 curr_desc = rx_curr_desc;
534 emac_rx_active_head =
535 (volatile emac_desc *) rx_curr_desc->next;
537 if (status & EMAC_CPPI_EOQ_BIT) {
538 if (emac_rx_active_head) {
540 (unsigned int) emac_rx_active_head;
542 emac_rx_queue_active = 0;
543 printf ("INFO:emac_rcv_packet: RX Queue not active\n");
547 /* Recycle RX descriptor */
548 rx_curr_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
549 rx_curr_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
550 rx_curr_desc->next = 0;
552 if (emac_rx_active_head == 0) {
553 printf ("INFO: emac_rcv_pkt: active queue head = 0\n");
554 emac_rx_active_head = curr_desc;
555 emac_rx_active_tail = curr_desc;
556 if (emac_rx_queue_active != 0) {
558 (unsigned int) emac_rx_active_head;
559 printf ("INFO: emac_rcv_pkt: active queue head = 0, HDP fired\n");
560 emac_rx_queue_active = 1;
563 tail_desc = emac_rx_active_tail;
564 emac_rx_active_tail = curr_desc;
565 tail_desc->next = (unsigned int) curr_desc;
566 status = tail_desc->pkt_flag_len;
567 if (status & EMAC_CPPI_EOQ_BIT) {
568 adap_emac->RX0HDP = (unsigned int) curr_desc;
569 status &= ~EMAC_CPPI_EOQ_BIT;
570 tail_desc->pkt_flag_len = status;
579 * This function initializes the emac hardware. It does NOT initialize
580 * EMAC modules power or pin multiplexors, that is done by board_init()
581 * much earlier in bootup process. Returns 1 on success, 0 otherwise.
583 static int davinci_eth_hw_init(void)
589 davinci_eth_mdio_enable();
591 for (i = 0; i < 256; i++) {
592 if (adap_mdio->ALIVE)
598 printf("No ETH PHY detected!!!\n");
602 /* Find if a PHY is connected and get it's address */
603 if (!davinci_eth_phy_detect())
606 /* Get PHY ID and initialize phy_ops for a detected PHY */
607 if (!davinci_eth_phy_read(active_phy_addr, PHY_PHYIDR1, &tmp)) {
608 active_phy_addr = 0xff;
612 phy_id = (tmp << 16) & 0xffff0000;
614 if (!davinci_eth_phy_read(active_phy_addr, PHY_PHYIDR2, &tmp)) {
615 active_phy_addr = 0xff;
619 phy_id |= tmp & 0x0000ffff;
623 sprintf(phy.name, "LXT972 @ 0x%02x", active_phy_addr);
624 phy.init = lxt972_init_phy;
625 phy.is_phy_connected = lxt972_is_phy_connected;
626 phy.get_link_speed = lxt972_get_link_speed;
627 phy.auto_negotiate = lxt972_auto_negotiate;
630 sprintf(phy.name, "DP83848 @ 0x%02x", active_phy_addr);
631 phy.init = dp83848_init_phy;
632 phy.is_phy_connected = dp83848_is_phy_connected;
633 phy.get_link_speed = dp83848_get_link_speed;
634 phy.auto_negotiate = dp83848_auto_negotiate;
637 sprintf(phy.name, "GENERIC @ 0x%02x", active_phy_addr);
638 phy.init = gen_init_phy;
639 phy.is_phy_connected = gen_is_phy_connected;
640 phy.get_link_speed = gen_get_link_speed;
641 phy.auto_negotiate = gen_auto_negotiate;
644 printf("Ethernet PHY: %s\n", phy.name);