diff options
Diffstat (limited to 'u-boot/drivers/net/ns9750_eth.c')
| -rw-r--r-- | u-boot/drivers/net/ns9750_eth.c | 789 |
1 files changed, 789 insertions, 0 deletions
diff --git a/u-boot/drivers/net/ns9750_eth.c b/u-boot/drivers/net/ns9750_eth.c new file mode 100644 index 0000000..9899563 --- /dev/null +++ b/u-boot/drivers/net/ns9750_eth.c @@ -0,0 +1,789 @@ +/*********************************************************************** + * + * Copyright (C) 2004 by FS Forth-Systeme GmbH. + * All rights reserved. + * + * $Id: ns9750_eth.c,v 1.2 2004/02/24 14:09:39 mpietrek Exp $ + * @Author: Markus Pietrek + * @Descr: Ethernet driver for the NS9750. Uses DMA Engine with polling + * interrupt status. But interrupts are not enabled. + * Only one tx buffer descriptor and the RXA buffer descriptor are used + * Currently no transmit lockup handling is included. eth_send has a 5s + * timeout for sending frames. No retransmits are performed when an + * error occurs. + * @References: [1] NS9750 Hardware Reference, December 2003 + * [2] Intel LXT971 Datasheet #249414 Rev. 02 + * [3] NS7520 Linux Ethernet Driver + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + ***********************************************************************/ + +#include <common.h> +#include <net.h> /* NetSendPacket */ + +#include "ns9750_eth.h" /* for Ethernet and PHY */ + +/* some definition to make transition to linux easier */ + +#define NS9750_DRIVER_NAME "eth" +#define KERN_WARNING "Warning:" +#define KERN_ERR "Error:" +#define KERN_INFO "Info:" + +#if 0 +# 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 NS9750_MII_NEG_DELAY (5*CONFIG_SYS_HZ) /* in s */ +#define TX_TIMEOUT (5*CONFIG_SYS_HZ) /* in s */ + +/* @TODO move it to eeprom.h */ +#define FS_EEPROM_AUTONEG_MASK 0x7 +#define FS_EEPROM_AUTONEG_SPEED_MASK 0x1 +#define FS_EEPROM_AUTONEG_SPEED_10 0x0 +#define FS_EEPROM_AUTONEG_SPEED_100 0x1 +#define FS_EEPROM_AUTONEG_DUPLEX_MASK 0x2 +#define FS_EEPROM_AUTONEG_DUPLEX_HALF 0x0 +#define FS_EEPROM_AUTONEG_DUPLEX_FULL 0x2 +#define FS_EEPROM_AUTONEG_ENABLE_MASK 0x4 +#define FS_EEPROM_AUTONEG_DISABLE 0x0 +#define FS_EEPROM_AUTONEG_ENABLE 0x4 + +/* buffer descriptors taken from [1] p.306 */ +typedef struct +{ + unsigned int* punSrc; + unsigned int unLen; /* 11 bits */ + unsigned int* punDest; /* unused */ + union { + unsigned int unReg; + struct { + unsigned uStatus : 16; + unsigned uRes : 12; + unsigned uFull : 1; + unsigned uEnable : 1; + unsigned uInt : 1; + unsigned uWrap : 1; + } bits; + } s; +} rx_buffer_desc_t; + +typedef struct +{ + unsigned int* punSrc; + unsigned int unLen; /* 10 bits */ + unsigned int* punDest; /* unused */ + union { + unsigned int unReg; /* only 32bit accesses may done to NS9750 + * eth engine */ + struct { + unsigned uStatus : 16; + unsigned uRes : 12; + unsigned uFull : 1; + unsigned uLast : 1; + unsigned uInt : 1; + unsigned uWrap : 1; + } bits; + } s; +} tx_buffer_desc_t; + +static int ns9750_eth_reset( void ); + +static void ns9750_link_force( void ); +static void ns9750_link_auto_negotiate( void ); +static void ns9750_link_update_egcr( void ); +static void ns9750_link_print_changed( void ); + +/* the PHY stuff */ + +static char ns9750_mii_identify_phy( void ); +static unsigned short ns9750_mii_read( unsigned short uiRegister ); +static void ns9750_mii_write( unsigned short uiRegister, unsigned short uiData ); +static unsigned int ns9750_mii_get_clock_divisor( unsigned int unMaxMDIOClk ); +static unsigned int ns9750_mii_poll_busy( void ); + +static unsigned int nPhyMaxMdioClock = PHY_MDIO_MAX_CLK; +static unsigned char ucLinkMode = FS_EEPROM_AUTONEG_ENABLE; +static unsigned int uiLastLinkStatus; +static PhyType phyDetected = PHY_NONE; + +/* we use only one tx buffer descriptor */ +static tx_buffer_desc_t* pTxBufferDesc = + (tx_buffer_desc_t*) get_eth_reg_addr( NS9750_ETH_TXBD ); + +/* we use only one rx buffer descriptor of the 4 */ +static rx_buffer_desc_t aRxBufferDesc[ 4 ]; + +/*********************************************************************** + * @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) +{ + /* This default MAC Addr is reserved by FS Forth-Systeme for the case of + EEPROM failures */ + unsigned char aucMACAddr[6] = { 0x00, 0x04, 0xf3, 0x00, 0x06, 0x35 }; + char *pcTmp = getenv ("ethaddr"); + char *pcEnd; + int i; + + DEBUG_FN (DEBUG_INIT); + + /* no need to check for hardware */ + + if (!ns9750_eth_reset ()) + return -1; + + if (pcTmp != NULL) + 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 (NS9750_ETH_SA1) = + aucMACAddr[5] << 8 | aucMACAddr[4]; + *get_eth_reg_addr (NS9750_ETH_SA2) = + aucMACAddr[3] << 8 | aucMACAddr[2]; + *get_eth_reg_addr (NS9750_ETH_SA3) = + aucMACAddr[1] << 8 | aucMACAddr[0]; + + /* enable hardware */ + + *get_eth_reg_addr (NS9750_ETH_MAC1) = NS9750_ETH_MAC1_RXEN; + + /* the linux kernel may give packets < 60 bytes, for example arp */ + *get_eth_reg_addr (NS9750_ETH_MAC2) = NS9750_ETH_MAC2_CRCEN | + NS9750_ETH_MAC2_PADEN | NS9750_ETH_MAC2_HUGE; + + /* enable receive and transmit FIFO, use 10/100 Mbps MII */ + *get_eth_reg_addr (NS9750_ETH_EGCR1) = + NS9750_ETH_EGCR1_ETXWM | + NS9750_ETH_EGCR1_ERX | + NS9750_ETH_EGCR1_ERXDMA | + NS9750_ETH_EGCR1_ETX | + NS9750_ETH_EGCR1_ETXDMA | NS9750_ETH_EGCR1_ITXA; + + /* prepare DMA descriptors */ + for (i = 0; i < 4; i++) { + aRxBufferDesc[i].punSrc = 0; + aRxBufferDesc[i].unLen = 0; + aRxBufferDesc[i].s.bits.uWrap = 1; + aRxBufferDesc[i].s.bits.uInt = 1; + aRxBufferDesc[i].s.bits.uEnable = 0; + aRxBufferDesc[i].s.bits.uFull = 0; + } + + /* NetRxPackets[ 0 ] is initialized before eth_init is called and never + changes. NetRxPackets is 32bit aligned */ + aRxBufferDesc[0].punSrc = (unsigned int *) NetRxPackets[0]; + aRxBufferDesc[0].s.bits.uEnable = 1; + aRxBufferDesc[0].unLen = 1522; /* as stated in [1] p.307 */ + + *get_eth_reg_addr (NS9750_ETH_RXAPTR) = + (unsigned int) &aRxBufferDesc[0]; + + /* [1] Tab. 221 states less than 5us */ + *get_eth_reg_addr (NS9750_ETH_EGCR1) |= NS9750_ETH_EGCR1_ERXINIT; + while (! + (*get_eth_reg_addr (NS9750_ETH_EGSR) & NS9750_ETH_EGSR_RXINIT)) + /* wait for finish */ + udelay (1); + + /* @TODO do we need to clear RXINIT? */ + *get_eth_reg_addr (NS9750_ETH_EGCR1) &= ~NS9750_ETH_EGCR1_ERXINIT; + + *get_eth_reg_addr (NS9750_ETH_RXFREE) = 0x1; + + 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) +{ + ulong ulTimeout; + + DEBUG_FN (DEBUG_TX); + + /* clear old status values */ + *get_eth_reg_addr (NS9750_ETH_EINTR) &= + *get_eth_reg_addr (NS9750_ETH_EINTR) & NS9750_ETH_EINTR_TX_MA; + + /* prepare Tx Descriptors */ + + pTxBufferDesc->punSrc = (unsigned int *) pPacket; /* pPacket is 32bit + * aligned */ + pTxBufferDesc->unLen = nLen; + /* only 32bit accesses allowed. wrap, full, interrupt and enabled to 1 */ + pTxBufferDesc->s.unReg = 0xf0000000; + /* pTxBufferDesc is the first possible buffer descriptor */ + *get_eth_reg_addr (NS9750_ETH_TXPTR) = 0x0; + + /* enable processor for next frame */ + + *get_eth_reg_addr (NS9750_ETH_EGCR2) &= ~NS9750_ETH_EGCR2_TCLER; + *get_eth_reg_addr (NS9750_ETH_EGCR2) |= NS9750_ETH_EGCR2_TCLER; + + ulTimeout = get_timer (0); + + DEBUG_ARGS0 (DEBUG_TX | DEBUG_MINOR, + "Waiting for transmission to finish\n"); + while (! + (*get_eth_reg_addr (NS9750_ETH_EINTR) & + (NS9750_ETH_EINTR_TXDONE | NS9750_ETH_EINTR_TXERR))) { + /* do nothing, wait for completion */ + if (get_timer (0) - ulTimeout > TX_TIMEOUT) { + DEBUG_ARGS0 (DEBUG_TX, "Transmit Timed out\n"); + return -1; + } + } + DEBUG_ARGS0 (DEBUG_TX | DEBUG_MINOR, "transmitted...\n"); + + return 0; +} + +/*********************************************************************** + * @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 nLen = 0; + unsigned int unStatus; + + unStatus = + *get_eth_reg_addr (NS9750_ETH_EINTR) & NS9750_ETH_EINTR_RX_MA; + + if (!unStatus) + /* no packet available, return immediately */ + return 0; + + DEBUG_FN (DEBUG_RX); + + /* unLen always < max(nLen) and discard checksum */ + nLen = (int) aRxBufferDesc[0].unLen - 4; + + /* acknowledge status register */ + *get_eth_reg_addr (NS9750_ETH_EINTR) = unStatus; + + aRxBufferDesc[0].unLen = 1522; + aRxBufferDesc[0].s.bits.uFull = 0; + + /* Buffer A descriptor available again */ + *get_eth_reg_addr (NS9750_ETH_RXFREE) |= 0x1; + + /* NetReceive may call eth_send. Due to a possible bug of the NS9750 we + * have to acknowledge the received frame before sending a new one */ + if (unStatus & NS9750_ETH_EINTR_RXDONEA) + NetReceive (NetRxPackets[0], nLen); + + return nLen; +} + +/*********************************************************************** + * @Function: eth_halt + * @Return: n/a + * @Descr: stops the ethernet engine + ***********************************************************************/ + +void eth_halt (void) +{ + DEBUG_FN (DEBUG_INIT); + + *get_eth_reg_addr (NS9750_ETH_MAC1) &= ~NS9750_ETH_MAC1_RXEN; + *get_eth_reg_addr (NS9750_ETH_EGCR1) &= ~(NS9750_ETH_EGCR1_ERX | + NS9750_ETH_EGCR1_ERXDMA | + NS9750_ETH_EGCR1_ETX | + NS9750_ETH_EGCR1_ETXDMA); +} + +/*********************************************************************** + * @Function: ns9750_eth_reset + * @Return: 0 on failure otherwise 1 + * @Descr: resets the ethernet interface and the PHY, + * performs auto negotiation or fixed modes + ***********************************************************************/ + +static int ns9750_eth_reset (void) +{ + DEBUG_FN (DEBUG_MINOR); + + /* Reset MAC */ + *get_eth_reg_addr (NS9750_ETH_EGCR1) |= NS9750_ETH_EGCR1_MAC_HRST; + udelay (5); /* according to [1], p.322 */ + *get_eth_reg_addr (NS9750_ETH_EGCR1) &= ~NS9750_ETH_EGCR1_MAC_HRST; + + /* reset and initialize PHY */ + + *get_eth_reg_addr (NS9750_ETH_MAC1) &= ~NS9750_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 (NS9750_ETH_MCFG) = + ns9750_mii_get_clock_divisor (nPhyMaxMdioClock); + + /* reset PHY */ + ns9750_mii_write(MII_BMCR, BMCR_RESET); + ns9750_mii_write(MII_BMCR, 0); + + /* @TODO check time */ + udelay (3000); /* [2] p.70 says at least 300us reset recovery time. But + go sure, it didn't worked stable at higher timer + frequencies under LxNETES-2.x */ + + /* MII clock has been setup to default, ns9750_mii_identify_phy should + work for all */ + + if (!ns9750_mii_identify_phy ()) { + printk (KERN_ERR NS9750_DRIVER_NAME + ": Unsupported PHY, aborting\n"); + return 0; + } + + /* now take the highest MDIO clock possible after detection */ + *get_eth_reg_addr (NS9750_ETH_MCFG) = + ns9750_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 */ + + if ((ucLinkMode & FS_EEPROM_AUTONEG_ENABLE_MASK) == + FS_EEPROM_AUTONEG_DISABLE) + /* use parameters defined */ + ns9750_link_force (); + else + ns9750_link_auto_negotiate (); + + if (phyDetected == PHY_LXT971A) + /* set LED2 to link mode */ + ns9750_mii_write (PHY_LXT971_LED_CFG, + PHY_LXT971_LED_CFG_LINK_ACT << + PHY_LXT971_LED_CFG_SHIFT_LED2); + + return 1; +} + +/*********************************************************************** + * @Function: ns9750_link_force + * @Return: void + * @Descr: configures eth and MII to use the link mode defined in + * ucLinkMode + ***********************************************************************/ + +static void ns9750_link_force (void) +{ + unsigned short uiControl; + + DEBUG_FN (DEBUG_LINK); + + uiControl = ns9750_mii_read(MII_BMCR); + uiControl &= ~(BMCR_SPEED1000 | BMCR_SPEED100 | + BMCR_ANENABLE | BMCR_FULLDPLX); + + uiLastLinkStatus = 0; + + if ((ucLinkMode & FS_EEPROM_AUTONEG_SPEED_MASK) == + FS_EEPROM_AUTONEG_SPEED_100) { + uiControl |= BMCR_SPEED100; + uiLastLinkStatus |= PHY_LXT971_STAT2_100BTX; + } + + if ((ucLinkMode & FS_EEPROM_AUTONEG_DUPLEX_MASK) == + FS_EEPROM_AUTONEG_DUPLEX_FULL) { + uiControl |= BMCR_FULLDPLX; + uiLastLinkStatus |= PHY_LXT971_STAT2_DUPLEX_MODE; + } + + ns9750_mii_write(MII_BMCR, uiControl); + + ns9750_link_print_changed (); + ns9750_link_update_egcr (); +} + +/*********************************************************************** + * @Function: ns9750_link_auto_negotiate + * @Return: void + * @Descr: performs auto-negotation of link. + ***********************************************************************/ + +static void ns9750_link_auto_negotiate (void) +{ + unsigned long ulStartJiffies; + unsigned short uiStatus; + + DEBUG_FN (DEBUG_LINK); + + /* run auto-negotation */ + /* define what we are capable of */ + ns9750_mii_write(MII_ADVERTISE, + LPA_100FULL | + LPA_100HALF | + LPA_10FULL | + LPA_10HALF | + PHY_ANLPAR_PSB_802_3); + /* start auto-negotiation */ + ns9750_mii_write(MII_BMCR, BMCR_ANENABLE | BMCR_ANRESTART); + + /* wait for completion */ + + ulStartJiffies = get_ticks (); + while (get_ticks () < ulStartJiffies + NS9750_MII_NEG_DELAY) { + uiStatus = ns9750_mii_read(MII_BMSR); + if ((uiStatus & + (BMSR_ANEGCOMPLETE | BMSR_LSTATUS)) == + (BMSR_ANEGCOMPLETE | BMSR_LSTATUS)) { + /* lucky we are, auto-negotiation succeeded */ + ns9750_link_print_changed (); + ns9750_link_update_egcr (); + return; + } + } + + DEBUG_ARGS0 (DEBUG_LINK, "auto-negotiation timed out\n"); + /* ignore invalid link settings */ +} + +/*********************************************************************** + * @Function: ns9750_link_update_egcr + * @Return: void + * @Descr: updates the EGCR and MAC2 link status after mode change or + * auto-negotation + ***********************************************************************/ + +static void ns9750_link_update_egcr (void) +{ + unsigned int unEGCR; + unsigned int unMAC2; + unsigned int unIPGT; + + DEBUG_FN (DEBUG_LINK); + + unEGCR = *get_eth_reg_addr (NS9750_ETH_EGCR1); + unMAC2 = *get_eth_reg_addr (NS9750_ETH_MAC2); + unIPGT = *get_eth_reg_addr (NS9750_ETH_IPGT) & ~NS9750_ETH_IPGT_MA; + + unMAC2 &= ~NS9750_ETH_MAC2_FULLD; + if ((uiLastLinkStatus & PHY_LXT971_STAT2_DUPLEX_MODE) + == PHY_LXT971_STAT2_DUPLEX_MODE) { + unMAC2 |= NS9750_ETH_MAC2_FULLD; + unIPGT |= 0x15; /* see [1] p. 339 */ + } else + unIPGT |= 0x12; /* see [1] p. 339 */ + + *get_eth_reg_addr (NS9750_ETH_MAC2) = unMAC2; + *get_eth_reg_addr (NS9750_ETH_EGCR1) = unEGCR; + *get_eth_reg_addr (NS9750_ETH_IPGT) = unIPGT; +} + +/*********************************************************************** + * @Function: ns9750_link_print_changed + * @Return: void + * @Descr: checks whether the link status has changed and if so prints + * the new mode + ***********************************************************************/ + +static void ns9750_link_print_changed (void) +{ + unsigned short uiStatus; + unsigned short uiControl; + + DEBUG_FN (DEBUG_LINK); + + uiControl = ns9750_mii_read(MII_BMCR); + + if ((uiControl & BMCR_ANENABLE) == BMCR_ANENABLE) { + /* BMSR_LSTATUS is only set on autonegotiation */ + uiStatus = ns9750_mii_read(MII_BMSR); + + if (!(uiStatus & BMSR_LSTATUS)) { + printk (KERN_WARNING NS9750_DRIVER_NAME + ": link down\n"); + /* @TODO Linux: carrier_off */ + } else { + /* @TODO Linux: carrier_on */ + if (phyDetected == PHY_LXT971A) { + uiStatus = ns9750_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 their 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 NS9750_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: ns9750_mii_identify_phy + * @Return: 1 if supported PHY has been detected otherwise 0 + * @Descr: checks for supported PHY and prints the IDs. + ***********************************************************************/ + +static char ns9750_mii_identify_phy (void) +{ + unsigned short uiID1; + unsigned short uiID2; + unsigned char *szName; + char cRes = 0; + + DEBUG_FN (DEBUG_MII); + + phyDetected = (PhyType) uiID1 = ns9750_mii_read(MII_PHYSID1); + + switch (phyDetected) { + case PHY_LXT971A: + szName = "LXT971A"; + uiID2 = ns9750_mii_read(MII_PHYSID2); + 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 NS9750_ETH_MCFG_CLKS */ + + uiID2 = 0; + szName = "unknown"; + nPhyMaxMdioClock = PHY_MDIO_MAX_CLK; + phyDetected = PHY_NONE; + } + + printk (KERN_INFO NS9750_DRIVER_NAME + ": PHY (0x%x, 0x%x) = %s detected\n", uiID1, uiID2, szName); + + return cRes; +} + +/*********************************************************************** + * @Function: ns9750_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 ns9750_mii_read (unsigned short uiRegister) +{ + DEBUG_FN (DEBUG_MII_LOW); + + /* write MII register to be read */ + *get_eth_reg_addr (NS9750_ETH_MADR) = + NS9750_ETH_PHY_ADDRESS << 8 | uiRegister; + + *get_eth_reg_addr (NS9750_ETH_MCMD) = NS9750_ETH_MCMD_READ; + + if (!ns9750_mii_poll_busy ()) + printk (KERN_WARNING NS9750_DRIVER_NAME + ": MII still busy in read\n"); + /* continue to read */ + + *get_eth_reg_addr (NS9750_ETH_MCMD) = 0; + + return (unsigned short) (*get_eth_reg_addr (NS9750_ETH_MRDD)); +} + + +/*********************************************************************** + * @Function: ns9750_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 ns9750_mii_write (unsigned short uiRegister, + unsigned short uiData) +{ + DEBUG_FN (DEBUG_MII_LOW); + + /* write MII register to be written */ + *get_eth_reg_addr (NS9750_ETH_MADR) = + NS9750_ETH_PHY_ADDRESS << 8 | uiRegister; + + *get_eth_reg_addr (NS9750_ETH_MWTD) = uiData; + + if (!ns9750_mii_poll_busy ()) { + printf (KERN_WARNING NS9750_DRIVER_NAME + ": MII still busy in write\n"); + } +} + + +/*********************************************************************** + * @Function: ns9750_mii_get_clock_divisor + * @Return: the clock divisor that should be used in NS9750_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 ns9750_mii_get_clock_divisor (unsigned int unMaxMDIOClk) +{ + struct { + unsigned int unSysClkDivisor; + unsigned int unClks; /* field for NS9750_ETH_MCFG_CLKS */ + } PHYClockDivisors[] = { + { + 4, NS9750_ETH_MCFG_CLKS_4}, { + 6, NS9750_ETH_MCFG_CLKS_6}, { + 8, NS9750_ETH_MCFG_CLKS_8}, { + 10, NS9750_ETH_MCFG_CLKS_10}, { + 20, NS9750_ETH_MCFG_CLKS_20}, { + 30, NS9750_ETH_MCFG_CLKS_30}, { + 40, NS9750_ETH_MCFG_CLKS_40} + }; + + int nIndexSysClkDiv; + int nArraySize = + sizeof (PHYClockDivisors) / sizeof (PHYClockDivisors[0]); + unsigned int unClks = NS9750_ETH_MCFG_CLKS_40; /* 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 (AHB_CLK_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: ns9750_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 ns9750_mii_poll_busy (void) +{ + unsigned int unTimeout = 10000; + + DEBUG_FN (DEBUG_MII_LOW); + + while (((*get_eth_reg_addr (NS9750_ETH_MIND) & NS9750_ETH_MIND_BUSY) + == NS9750_ETH_MIND_BUSY) && unTimeout) + unTimeout--; + + return unTimeout; +} |