+++ /dev/null
-/***********************************************************************
- *
- * Copyright (C) 2005 by Videon Central, Inc.
- *
- * $Id$
- * @Author: Arthur Shipkowski
- * @Descr: Ethernet driver for the NS7520. Uses polled Ethernet, like
- * the older netarmeth driver. Note that attempting to filter
- * broadcast and multicast out in the SAFR register will cause
- * bad things due to released errata.
- * @References: [1] NS7520 Hardware Reference, December 2003
- * [2] Intel LXT971 Datasheet #249414 Rev. 02
- *
- ***********************************************************************/
-
-#include <common.h>
-
-#if defined(CONFIG_DRIVER_NS7520_ETHERNET)
-
-#include <net.h> /* NetSendPacket */
-#include <asm/arch/netarm_registers.h>
-#include <asm/arch/netarm_dma_module.h>
-
-#include "ns7520_eth.h" /* for Ethernet and PHY */
-
-/**
- * Send an error message to the terminal.
- */
-#define ERROR(x) \
-do { \
- char *__foo = strrchr(__FILE__, '/'); \
- \
- printf("%s: %d: %s(): ", (__foo == NULL ? __FILE__ : (__foo + 1)), \
- __LINE__, __FUNCTION__); \
- printf x; printf("\n"); \
-} while (0);
-
-/* some definition to make transistion to linux easier */
-
-#define NS7520_DRIVER_NAME "eth"
-#define KERN_WARNING "Warning:"
-#define KERN_ERR "Error:"
-#define KERN_INFO "Info:"
-
-#if 1
-# define DEBUG
-#endif
-
-#ifdef DEBUG
-# define printk printf
-
-# define DEBUG_INIT 0x0001
-# define DEBUG_MINOR 0x0002
-# define DEBUG_RX 0x0004
-# define DEBUG_TX 0x0008
-# define DEBUG_INT 0x0010
-# define DEBUG_POLL 0x0020
-# define DEBUG_LINK 0x0040
-# define DEBUG_MII 0x0100
-# define DEBUG_MII_LOW 0x0200
-# define DEBUG_MEM 0x0400
-# define DEBUG_ERROR 0x4000
-# define DEBUG_ERROR_CRIT 0x8000
-
-static int nDebugLvl = DEBUG_ERROR_CRIT;
-
-# define DEBUG_ARGS0( FLG, a0 ) if( ( nDebugLvl & (FLG) ) == (FLG) ) \
- printf("%s: " a0, __FUNCTION__, 0, 0, 0, 0, 0, 0 )
-# define DEBUG_ARGS1( FLG, a0, a1 ) if( ( nDebugLvl & (FLG) ) == (FLG)) \
- printf("%s: " a0, __FUNCTION__, (int)(a1), 0, 0, 0, 0, 0 )
-# define DEBUG_ARGS2( FLG, a0, a1, a2 ) if( (nDebugLvl & (FLG)) ==(FLG))\
- printf("%s: " a0, __FUNCTION__, (int)(a1), (int)(a2), 0, 0,0,0 )
-# define DEBUG_ARGS3( FLG, a0, a1, a2, a3 ) if((nDebugLvl &(FLG))==(FLG))\
- printf("%s: "a0,__FUNCTION__,(int)(a1),(int)(a2),(int)(a3),0,0,0)
-# define DEBUG_FN( FLG ) if( (nDebugLvl & (FLG)) == (FLG) ) \
- printf("\r%s:line %d\n", (int)__FUNCTION__, __LINE__, 0,0,0,0);
-# define ASSERT( expr, func ) if( !( expr ) ) { \
- printf( "Assertion failed! %s:line %d %s\n", \
- (int)__FUNCTION__,__LINE__,(int)(#expr),0,0,0); \
- func }
-#else /* DEBUG */
-# define printk(...)
-# define DEBUG_ARGS0( FLG, a0 )
-# define DEBUG_ARGS1( FLG, a0, a1 )
-# define DEBUG_ARGS2( FLG, a0, a1, a2 )
-# define DEBUG_ARGS3( FLG, a0, a1, a2, a3 )
-# define DEBUG_FN( n )
-# define ASSERT(expr, func)
-#endif /* DEBUG */
-
-#define NS7520_MII_NEG_DELAY (5*CFG_HZ) /* in s */
-#define TX_TIMEOUT (5*CFG_HZ) /* in s */
-#define RX_STALL_WORKAROUND_CNT 100
-
-static int ns7520_eth_reset(void);
-
-static void ns7520_link_auto_negotiate(void);
-static void ns7520_link_update_egcr(void);
-static void ns7520_link_print_changed(void);
-
-/* the PHY stuff */
-
-static char ns7520_mii_identify_phy(void);
-static unsigned short ns7520_mii_read(unsigned short uiRegister);
-static void ns7520_mii_write(unsigned short uiRegister,
- unsigned short uiData);
-static unsigned int ns7520_mii_get_clock_divisor(unsigned int
- unMaxMDIOClk);
-static unsigned int ns7520_mii_poll_busy(void);
-
-static unsigned int nPhyMaxMdioClock = PHY_MDIO_MAX_CLK;
-static unsigned int uiLastLinkStatus;
-static PhyType phyDetected = PHY_NONE;
-
-/***********************************************************************
- * @Function: eth_init
- * @Return: -1 on failure otherwise 0
- * @Descr: Initializes the ethernet engine and uses either FS Forth's default
- * MAC addr or the one in environment
- ***********************************************************************/
-
-int eth_init(bd_t * pbis)
-{
- unsigned char aucMACAddr[6];
- char *pcTmp = getenv("ethaddr");
- char *pcEnd;
- int i;
-
- DEBUG_FN(DEBUG_INIT);
-
- /* no need to check for hardware */
-
- if (!ns7520_eth_reset())
- return -1;
-
- if (NULL == pcTmp)
- return -1;
-
- for (i = 0; i < 6; i++) {
- aucMACAddr[i] =
- pcTmp ? simple_strtoul(pcTmp, &pcEnd, 16) : 0;
- pcTmp = (*pcTmp) ? pcEnd + 1 : pcEnd;
- }
-
- /* configure ethernet address */
-
- *get_eth_reg_addr(NS7520_ETH_SA1) =
- aucMACAddr[5] << 8 | aucMACAddr[4];
- *get_eth_reg_addr(NS7520_ETH_SA2) =
- aucMACAddr[3] << 8 | aucMACAddr[2];
- *get_eth_reg_addr(NS7520_ETH_SA3) =
- aucMACAddr[1] << 8 | aucMACAddr[0];
-
- /* enable hardware */
-
- *get_eth_reg_addr(NS7520_ETH_MAC1) = NS7520_ETH_MAC1_RXEN;
- *get_eth_reg_addr(NS7520_ETH_SUPP) = NS7520_ETH_SUPP_JABBER;
- *get_eth_reg_addr(NS7520_ETH_MAC1) = NS7520_ETH_MAC1_RXEN;
-
- /* the linux kernel may give packets < 60 bytes, for example arp */
- *get_eth_reg_addr(NS7520_ETH_MAC2) = NS7520_ETH_MAC2_CRCEN |
- NS7520_ETH_MAC2_PADEN | NS7520_ETH_MAC2_HUGE;
-
- /* Broadcast/multicast allowed; if you don't set this even unicast chokes */
- /* Based on NS7520 errata documentation */
- *get_eth_reg_addr(NS7520_ETH_SAFR) =
- NS7520_ETH_SAFR_BROAD | NS7520_ETH_SAFR_PRM;
-
- /* enable receive and transmit FIFO, use 10/100 Mbps MII */
- *get_eth_reg_addr(NS7520_ETH_EGCR) |=
- NS7520_ETH_EGCR_ETXWM_75 |
- NS7520_ETH_EGCR_ERX |
- NS7520_ETH_EGCR_ERXREG |
- NS7520_ETH_EGCR_ERXBR | NS7520_ETH_EGCR_ETX;
-
- return 0;
-}
-
-/***********************************************************************
- * @Function: eth_send
- * @Return: -1 on timeout otherwise 1
- * @Descr: sends one frame by DMA
- ***********************************************************************/
-
-int eth_send(volatile void *pPacket, int nLen)
-{
- int i, length32, retval = 1;
- char *pa;
- unsigned int *pa32, lastp = 0, rest;
- unsigned int status;
-
- pa = (char *) pPacket;
- pa32 = (unsigned int *) pPacket;
- length32 = nLen / 4;
- rest = nLen % 4;
-
- /* make sure there's no garbage in the last word */
- switch (rest) {
- case 0:
- lastp = pa32[length32 - 1];
- length32--;
- break;
- case 1:
- lastp = pa32[length32] & 0x000000ff;
- break;
- case 2:
- lastp = pa32[length32] & 0x0000ffff;
- break;
- case 3:
- lastp = pa32[length32] & 0x00ffffff;
- break;
- }
-
- while (((*get_eth_reg_addr(NS7520_ETH_EGSR)) &
- NS7520_ETH_EGSR_TXREGE)
- == 0) {
- }
-
- /* write to the fifo */
- for (i = 0; i < length32; i++)
- *get_eth_reg_addr(NS7520_ETH_FIFO) = pa32[i];
-
- /* the last word is written to an extra register, this
- starts the transmission */
- *get_eth_reg_addr(NS7520_ETH_FIFOL) = lastp;
-
- /* Wait for it to be done */
- while ((*get_eth_reg_addr(NS7520_ETH_EGSR) & NS7520_ETH_EGSR_TXBC)
- == 0) {
- }
- status = (*get_eth_reg_addr(NS7520_ETH_ETSR));
- *get_eth_reg_addr(NS7520_ETH_EGSR) = NS7520_ETH_EGSR_TXBC; /* Clear it now */
-
- if (status & NS7520_ETH_ETSR_TXOK) {
- retval = 0; /* We're OK! */
- } else if (status & NS7520_ETH_ETSR_TXDEF) {
- printf("Deferred, we'll see.\n");
- retval = 0;
- } else if (status & NS7520_ETH_ETSR_TXAL) {
- printf("Late collision error, %d collisions.\n",
- (*get_eth_reg_addr(NS7520_ETH_ETSR)) &
- NS7520_ETH_ETSR_TXCOLC);
- } else if (status & NS7520_ETH_ETSR_TXAEC) {
- printf("Excessive collisions: %d\n",
- (*get_eth_reg_addr(NS7520_ETH_ETSR)) &
- NS7520_ETH_ETSR_TXCOLC);
- } else if (status & NS7520_ETH_ETSR_TXAED) {
- printf("Excessive deferral on xmit.\n");
- } else if (status & NS7520_ETH_ETSR_TXAUR) {
- printf("Packet underrun.\n");
- } else if (status & NS7520_ETH_ETSR_TXAJ) {
- printf("Jumbo packet error.\n");
- } else {
- printf("Error: Should never get here.\n");
- }
-
- return (retval);
-}
-
-/***********************************************************************
- * @Function: eth_rx
- * @Return: size of last frame in bytes or 0 if no frame available
- * @Descr: gives one frame to U-Boot which has been copied by DMA engine already
- * to NetRxPackets[ 0 ].
- ***********************************************************************/
-
-int eth_rx(void)
-{
- int i;
- unsigned short rxlen;
- unsigned short totrxlen = 0;
- unsigned int *addr;
- unsigned int rxstatus, lastrxlen;
- char *pa;
-
- /* If RXBR is 1, data block was received */
- while (((*get_eth_reg_addr(NS7520_ETH_EGSR)) &
- NS7520_ETH_EGSR_RXBR) == NS7520_ETH_EGSR_RXBR) {
-
- /* get status register and the length of received block */
- rxstatus = *get_eth_reg_addr(NS7520_ETH_ERSR);
- rxlen = (rxstatus & NS7520_ETH_ERSR_RXSIZE) >> 16;
-
- /* clear RXBR to make fifo available */
- *get_eth_reg_addr(NS7520_ETH_EGSR) = NS7520_ETH_EGSR_RXBR;
-
- if (rxstatus & NS7520_ETH_ERSR_ROVER) {
- printf("Receive overrun, resetting FIFO.\n");
- *get_eth_reg_addr(NS7520_ETH_EGCR) &=
- ~NS7520_ETH_EGCR_ERX;
- udelay(20);
- *get_eth_reg_addr(NS7520_ETH_EGCR) |=
- NS7520_ETH_EGCR_ERX;
- }
- if (rxlen == 0) {
- printf("Nothing.\n");
- return 0;
- }
-
- addr = (unsigned int *) NetRxPackets[0];
- pa = (char *) NetRxPackets[0];
-
- /* read the fifo */
- for (i = 0; i < rxlen / 4; i++) {
- *addr = *get_eth_reg_addr(NS7520_ETH_FIFO);
- addr++;
- }
-
- if ((*get_eth_reg_addr(NS7520_ETH_EGSR)) &
- NS7520_ETH_EGSR_RXREGR) {
- /* RXFDB indicates wether the last word is 1,2,3 or 4 bytes long */
- lastrxlen =
- ((*get_eth_reg_addr(NS7520_ETH_EGSR)) &
- NS7520_ETH_EGSR_RXFDB_MA) >> 28;
- *addr = *get_eth_reg_addr(NS7520_ETH_FIFO);
- switch (lastrxlen) {
- case 1:
- *addr &= 0xff000000;
- break;
- case 2:
- *addr &= 0xffff0000;
- break;
- case 3:
- *addr &= 0xffffff00;
- break;
- }
- }
-
- /* Pass the packet up to the protocol layers. */
- NetReceive(NetRxPackets[0], rxlen - 4);
- totrxlen += rxlen - 4;
- }
-
- return totrxlen;
-}
-
-/***********************************************************************
- * @Function: eth_halt
- * @Return: n/a
- * @Descr: stops the ethernet engine
- ***********************************************************************/
-
-void eth_halt(void)
-{
- DEBUG_FN(DEBUG_INIT);
-
- *get_eth_reg_addr(NS7520_ETH_MAC1) &= ~NS7520_ETH_MAC1_RXEN;
- *get_eth_reg_addr(NS7520_ETH_EGCR) &= ~(NS7520_ETH_EGCR_ERX |
- NS7520_ETH_EGCR_ERXDMA |
- NS7520_ETH_EGCR_ERXREG |
- NS7520_ETH_EGCR_ERXBR |
- NS7520_ETH_EGCR_ETX |
- NS7520_ETH_EGCR_ETXDMA);
-}
-
-/***********************************************************************
- * @Function: ns7520_eth_reset
- * @Return: 0 on failure otherwise 1
- * @Descr: resets the ethernet interface and the PHY,
- * performs auto negotiation or fixed modes
- ***********************************************************************/
-
-static int ns7520_eth_reset(void)
-{
- DEBUG_FN(DEBUG_MINOR);
-
- /* Reset important registers */
- *get_eth_reg_addr(NS7520_ETH_EGCR) = 0; /* Null it out! */
- *get_eth_reg_addr(NS7520_ETH_MAC1) &= NS7520_ETH_MAC1_SRST;
- *get_eth_reg_addr(NS7520_ETH_MAC2) = 0;
- /* Reset MAC */
- *get_eth_reg_addr(NS7520_ETH_EGCR) |= NS7520_ETH_EGCR_MAC_RES;
- udelay(5);
- *get_eth_reg_addr(NS7520_ETH_EGCR) &= ~NS7520_ETH_EGCR_MAC_RES;
-
- /* reset and initialize PHY */
-
- *get_eth_reg_addr(NS7520_ETH_MAC1) &= ~NS7520_ETH_MAC1_SRST;
-
- /* we don't support hot plugging of PHY, therefore we don't reset
- phyDetected and nPhyMaxMdioClock here. The risk is if the setting is
- incorrect the first open
- may detect the PHY correctly but succeding will fail
- For reseting the PHY and identifying we have to use the standard
- MDIO CLOCK value 2.5 MHz only after hardware reset
- After having identified the PHY we will do faster */
-
- *get_eth_reg_addr(NS7520_ETH_MCFG) =
- ns7520_mii_get_clock_divisor(nPhyMaxMdioClock);
-
- /* reset PHY */
- ns7520_mii_write(PHY_COMMON_CTRL, PHY_COMMON_CTRL_RESET);
- ns7520_mii_write(PHY_COMMON_CTRL, 0);
-
- udelay(3000); /* [2] p.70 says at least 300us reset recovery time. */
-
- /* MII clock has been setup to default, ns7520_mii_identify_phy should
- work for all */
-
- if (!ns7520_mii_identify_phy()) {
- printk(KERN_ERR NS7520_DRIVER_NAME
- ": Unsupported PHY, aborting\n");
- return 0;
- }
-
- /* now take the highest MDIO clock possible after detection */
- *get_eth_reg_addr(NS7520_ETH_MCFG) =
- ns7520_mii_get_clock_divisor(nPhyMaxMdioClock);
-
- /* PHY has been detected, so there can be no abort reason and we can
- finish initializing ethernet */
-
- uiLastLinkStatus = 0xff; /* undefined */
-
- ns7520_link_auto_negotiate();
-
- if (phyDetected == PHY_LXT971A)
- /* set LED2 to link mode */
- ns7520_mii_write(PHY_LXT971_LED_CFG,
- (PHY_LXT971_LED_CFG_LINK_ACT <<
- PHY_LXT971_LED_CFG_SHIFT_LED2) |
- (PHY_LXT971_LED_CFG_TRANSMIT <<
- PHY_LXT971_LED_CFG_SHIFT_LED1));
-
- return 1;
-}
-
-/***********************************************************************
- * @Function: ns7520_link_auto_negotiate
- * @Return: void
- * @Descr: performs auto-negotation of link.
- ***********************************************************************/
-
-static void ns7520_link_auto_negotiate(void)
-{
- unsigned long ulStartJiffies;
- unsigned short uiStatus;
-
- DEBUG_FN(DEBUG_LINK);
-
- /* run auto-negotation */
- /* define what we are capable of */
- ns7520_mii_write(PHY_COMMON_AUTO_ADV,
- PHY_COMMON_AUTO_ADV_100BTXFD |
- PHY_COMMON_AUTO_ADV_100BTX |
- PHY_COMMON_AUTO_ADV_10BTFD |
- PHY_COMMON_AUTO_ADV_10BT |
- PHY_COMMON_AUTO_ADV_802_3);
- /* start auto-negotiation */
- ns7520_mii_write(PHY_COMMON_CTRL,
- PHY_COMMON_CTRL_AUTO_NEG |
- PHY_COMMON_CTRL_RES_AUTO);
-
- /* wait for completion */
-
- ulStartJiffies = get_timer(0);
- while (get_timer(0) < ulStartJiffies + NS7520_MII_NEG_DELAY) {
- uiStatus = ns7520_mii_read(PHY_COMMON_STAT);
- if ((uiStatus &
- (PHY_COMMON_STAT_AN_COMP | PHY_COMMON_STAT_LNK_STAT))
- ==
- (PHY_COMMON_STAT_AN_COMP | PHY_COMMON_STAT_LNK_STAT)) {
- /* lucky we are, auto-negotiation succeeded */
- ns7520_link_print_changed();
- ns7520_link_update_egcr();
- return;
- }
- }
-
- DEBUG_ARGS0(DEBUG_LINK, "auto-negotiation timed out\n");
- /* ignore invalid link settings */
-}
-
-/***********************************************************************
- * @Function: ns7520_link_update_egcr
- * @Return: void
- * @Descr: updates the EGCR and MAC2 link status after mode change or
- * auto-negotation
- ***********************************************************************/
-
-static void ns7520_link_update_egcr(void)
-{
- unsigned int unEGCR;
- unsigned int unMAC2;
- unsigned int unIPGT;
-
- DEBUG_FN(DEBUG_LINK);
-
- unEGCR = *get_eth_reg_addr(NS7520_ETH_EGCR);
- unMAC2 = *get_eth_reg_addr(NS7520_ETH_MAC2);
- unIPGT =
- *get_eth_reg_addr(NS7520_ETH_IPGT) & ~NS7520_ETH_IPGT_IPGT;
-
- unEGCR &= ~NS7520_ETH_EGCR_EFULLD;
- unMAC2 &= ~NS7520_ETH_MAC2_FULLD;
- if ((uiLastLinkStatus & PHY_LXT971_STAT2_DUPLEX_MODE)
- == PHY_LXT971_STAT2_DUPLEX_MODE) {
- unEGCR |= NS7520_ETH_EGCR_EFULLD;
- unMAC2 |= NS7520_ETH_MAC2_FULLD;
- unIPGT |= 0x15; /* see [1] p. 167 */
- } else
- unIPGT |= 0x12; /* see [1] p. 167 */
-
- *get_eth_reg_addr(NS7520_ETH_MAC2) = unMAC2;
- *get_eth_reg_addr(NS7520_ETH_EGCR) = unEGCR;
- *get_eth_reg_addr(NS7520_ETH_IPGT) = unIPGT;
-}
-
-/***********************************************************************
- * @Function: ns7520_link_print_changed
- * @Return: void
- * @Descr: checks whether the link status has changed and if so prints
- * the new mode
- ***********************************************************************/
-
-static void ns7520_link_print_changed(void)
-{
- unsigned short uiStatus;
- unsigned short uiControl;
-
- DEBUG_FN(DEBUG_LINK);
-
- uiControl = ns7520_mii_read(PHY_COMMON_CTRL);
-
- if ((uiControl & PHY_COMMON_CTRL_AUTO_NEG) ==
- PHY_COMMON_CTRL_AUTO_NEG) {
- /* PHY_COMMON_STAT_LNK_STAT is only set on autonegotiation */
- uiStatus = ns7520_mii_read(PHY_COMMON_STAT);
-
- if (!(uiStatus & PHY_COMMON_STAT_LNK_STAT)) {
- printk(KERN_WARNING NS7520_DRIVER_NAME
- ": link down\n");
- /* @TODO Linux: carrier_off */
- } else {
- /* @TODO Linux: carrier_on */
- if (phyDetected == PHY_LXT971A) {
- uiStatus =
- ns7520_mii_read(PHY_LXT971_STAT2);
- uiStatus &=
- (PHY_LXT971_STAT2_100BTX |
- PHY_LXT971_STAT2_DUPLEX_MODE |
- PHY_LXT971_STAT2_AUTO_NEG);
-
- /* mask out all uninteresting parts */
- }
- /* other PHYs must store there link information in
- uiStatus as PHY_LXT971 */
- }
- } else {
- /* mode has been forced, so uiStatus should be the same as the
- last link status, enforce printing */
- uiStatus = uiLastLinkStatus;
- uiLastLinkStatus = 0xff;
- }
-
- if (uiStatus != uiLastLinkStatus) {
- /* save current link status */
- uiLastLinkStatus = uiStatus;
-
- /* print new link status */
-
- printk(KERN_INFO NS7520_DRIVER_NAME
- ": link mode %i Mbps %s duplex %s\n",
- (uiStatus & PHY_LXT971_STAT2_100BTX) ? 100 : 10,
- (uiStatus & PHY_LXT971_STAT2_DUPLEX_MODE) ? "full" :
- "half",
- (uiStatus & PHY_LXT971_STAT2_AUTO_NEG) ? "(auto)" :
- "");
- }
-}
-
-/***********************************************************************
- * the MII low level stuff
- ***********************************************************************/
-
-/***********************************************************************
- * @Function: ns7520_mii_identify_phy
- * @Return: 1 if supported PHY has been detected otherwise 0
- * @Descr: checks for supported PHY and prints the IDs.
- ***********************************************************************/
-
-static char ns7520_mii_identify_phy(void)
-{
- unsigned short uiID1;
- unsigned short uiID2;
- unsigned char *szName;
- char cRes = 0;
-
- DEBUG_FN(DEBUG_MII);
-
- phyDetected = (PhyType) uiID1 = ns7520_mii_read(PHY_COMMON_ID1);
-
- switch (phyDetected) {
- case PHY_LXT971A:
- szName = "LXT971A";
- uiID2 = ns7520_mii_read(PHY_COMMON_ID2);
- nPhyMaxMdioClock = PHY_LXT971_MDIO_MAX_CLK;
- cRes = 1;
- break;
- case PHY_NONE:
- default:
- /* in case uiID1 == 0 && uiID2 == 0 we may have the wrong
- address or reset sets the wrong NS7520_ETH_MCFG_CLKS */
-
- uiID2 = 0;
- szName = "unknown";
- nPhyMaxMdioClock = PHY_MDIO_MAX_CLK;
- phyDetected = PHY_NONE;
- }
-
- printk(KERN_INFO NS7520_DRIVER_NAME
- ": PHY (0x%x, 0x%x) = %s detected\n", uiID1, uiID2, szName);
-
- return cRes;
-}
-
-/***********************************************************************
- * @Function: ns7520_mii_read
- * @Return: the data read from PHY register uiRegister
- * @Descr: the data read may be invalid if timed out. If so, a message
- * is printed but the invalid data is returned.
- * The fixed device address is being used.
- ***********************************************************************/
-
-static unsigned short ns7520_mii_read(unsigned short uiRegister)
-{
- DEBUG_FN(DEBUG_MII_LOW);
-
- /* write MII register to be read */
- *get_eth_reg_addr(NS7520_ETH_MADR) =
- CONFIG_PHY_ADDR << 8 | uiRegister;
-
- *get_eth_reg_addr(NS7520_ETH_MCMD) = NS7520_ETH_MCMD_READ;
-
- if (!ns7520_mii_poll_busy())
- printk(KERN_WARNING NS7520_DRIVER_NAME
- ": MII still busy in read\n");
- /* continue to read */
-
- *get_eth_reg_addr(NS7520_ETH_MCMD) = 0;
-
- return (unsigned short) (*get_eth_reg_addr(NS7520_ETH_MRDD));
-}
-
-/***********************************************************************
- * @Function: ns7520_mii_write
- * @Return: nothing
- * @Descr: writes the data to the PHY register. In case of a timeout,
- * no special handling is performed but a message printed
- * The fixed device address is being used.
- ***********************************************************************/
-
-static void ns7520_mii_write(unsigned short uiRegister,
- unsigned short uiData)
-{
- DEBUG_FN(DEBUG_MII_LOW);
-
- /* write MII register to be written */
- *get_eth_reg_addr(NS7520_ETH_MADR) =
- CONFIG_PHY_ADDR << 8 | uiRegister;
-
- *get_eth_reg_addr(NS7520_ETH_MWTD) = uiData;
-
- if (!ns7520_mii_poll_busy()) {
- printf(KERN_WARNING NS7520_DRIVER_NAME
- ": MII still busy in write\n");
- }
-}
-
-/***********************************************************************
- * @Function: ns7520_mii_get_clock_divisor
- * @Return: the clock divisor that should be used in NS7520_ETH_MCFG_CLKS
- * @Descr: if no clock divisor can be calculated for the
- * current SYSCLK and the maximum MDIO Clock, a warning is printed
- * and the greatest divisor is taken
- ***********************************************************************/
-
-static unsigned int ns7520_mii_get_clock_divisor(unsigned int unMaxMDIOClk)
-{
- struct {
- unsigned int unSysClkDivisor;
- unsigned int unClks; /* field for NS7520_ETH_MCFG_CLKS */
- } PHYClockDivisors[] = {
- {
- 4, NS7520_ETH_MCFG_CLKS_4}, {
- 6, NS7520_ETH_MCFG_CLKS_6}, {
- 8, NS7520_ETH_MCFG_CLKS_8}, {
- 10, NS7520_ETH_MCFG_CLKS_10}, {
- 14, NS7520_ETH_MCFG_CLKS_14}, {
- 20, NS7520_ETH_MCFG_CLKS_20}, {
- 28, NS7520_ETH_MCFG_CLKS_28}
- };
-
- int nIndexSysClkDiv;
- int nArraySize =
- sizeof(PHYClockDivisors) / sizeof(PHYClockDivisors[0]);
- unsigned int unClks = NS7520_ETH_MCFG_CLKS_28; /* defaults to
- greatest div */
-
- DEBUG_FN(DEBUG_INIT);
-
- for (nIndexSysClkDiv = 0; nIndexSysClkDiv < nArraySize;
- nIndexSysClkDiv++) {
- /* find first sysclock divisor that isn't higher than 2.5 MHz
- clock */
- if (NETARM_XTAL_FREQ /
- PHYClockDivisors[nIndexSysClkDiv].unSysClkDivisor <=
- unMaxMDIOClk) {
- unClks = PHYClockDivisors[nIndexSysClkDiv].unClks;
- break;
- }
- }
-
- DEBUG_ARGS2(DEBUG_INIT,
- "Taking MDIO Clock bit mask 0x%0x for max clock %i\n",
- unClks, unMaxMDIOClk);
-
- /* return greatest divisor */
- return unClks;
-}
-
-/***********************************************************************
- * @Function: ns7520_mii_poll_busy
- * @Return: 0 if timed out otherwise the remaing timeout
- * @Descr: waits until the MII has completed a command or it times out
- * code may be interrupted by hard interrupts.
- * It is not checked what happens on multiple actions when
- * the first is still being busy and we timeout.
- ***********************************************************************/
-
-static unsigned int ns7520_mii_poll_busy(void)
-{
- unsigned int unTimeout = 1000;
-
- DEBUG_FN(DEBUG_MII_LOW);
-
- while (((*get_eth_reg_addr(NS7520_ETH_MIND) & NS7520_ETH_MIND_BUSY)
- == NS7520_ETH_MIND_BUSY) && unTimeout)
- unTimeout--;
-
- return unTimeout;
-}
-
-/* ----------------------------------------------------------------------------
- * Net+ARM ethernet MII functionality.
- */
-#if defined(CONFIG_MII)
-
-/**
- * Maximum MII address we support
- */
-#define MII_ADDRESS_MAX (31)
-
-/**
- * Maximum MII register address we support
- */
-#define MII_REGISTER_MAX (31)
-
-/**
- * Ethernet MII interface return values for public functions.
- */
-enum mii_status {
- MII_STATUS_SUCCESS = 0,
- MII_STATUS_FAILURE = 1,
-};
-
-/**
- * Read a 16-bit value from an MII register.
- */
-extern int ns7520_miiphy_read(char *devname, unsigned char const addr,
- unsigned char const reg, unsigned short *const value)
-{
- int ret = MII_STATUS_FAILURE;
-
- /* Parameter checks */
- if (addr > MII_ADDRESS_MAX) {
- ERROR(("invalid addr, 0x%02X", addr));
- goto miiphy_read_failed_0;
- }
-
- if (reg > MII_REGISTER_MAX) {
- ERROR(("invalid reg, 0x%02X", reg));
- goto miiphy_read_failed_0;
- }
-
- if (value == NULL) {
- ERROR(("NULL value"));
- goto miiphy_read_failed_0;
- }
-
- DEBUG_FN(DEBUG_MII_LOW);
-
- /* write MII register to be read */
- *get_eth_reg_addr(NS7520_ETH_MADR) = (addr << 8) | reg;
-
- *get_eth_reg_addr(NS7520_ETH_MCMD) = NS7520_ETH_MCMD_READ;
-
- if (!ns7520_mii_poll_busy())
- printk(KERN_WARNING NS7520_DRIVER_NAME
- ": MII still busy in read\n");
- /* continue to read */
-
- *get_eth_reg_addr(NS7520_ETH_MCMD) = 0;
-
- *value = (*get_eth_reg_addr(NS7520_ETH_MRDD));
- ret = MII_STATUS_SUCCESS;
- /* Fall through */
-
- miiphy_read_failed_0:
- return (ret);
-}
-
-/**
- * Write a 16-bit value to an MII register.
- */
-extern int ns7520_miiphy_write(char *devname, unsigned char const addr,
- unsigned char const reg, unsigned short const value)
-{
- int ret = MII_STATUS_FAILURE;
-
- /* Parameter checks */
- if (addr > MII_ADDRESS_MAX) {
- ERROR(("invalid addr, 0x%02X", addr));
- goto miiphy_write_failed_0;
- }
-
- if (reg > MII_REGISTER_MAX) {
- ERROR(("invalid reg, 0x%02X", reg));
- goto miiphy_write_failed_0;
- }
-
- /* write MII register to be written */
- *get_eth_reg_addr(NS7520_ETH_MADR) = (addr << 8) | reg;
-
- *get_eth_reg_addr(NS7520_ETH_MWTD) = value;
-
- if (!ns7520_mii_poll_busy()) {
- printf(KERN_WARNING NS7520_DRIVER_NAME
- ": MII still busy in write\n");
- }
-
- ret = MII_STATUS_SUCCESS;
- /* Fall through */
-
- miiphy_write_failed_0:
- return (ret);
-}
-#endif /* defined(CONFIG_MII) */
-#endif /* CONFIG_DRIVER_NS7520_ETHERNET */
-
-int ns7520_miiphy_initialize(bd_t *bis)
-{
-#if defined(CONFIG_DRIVER_NS7520_ETHERNET)
-#if defined(CONFIG_MII)
- miiphy_register("ns7520phy", ns7520_miiphy_read, ns7520_miiphy_write);
-#endif
-#endif
- return 0;
-}
projects / oweals / u-boot.git / blobdiff