125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/*
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* File: am79c874.c
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* Purpose: Driver for the AMD AM79C874 10/100 Ethernet PHY
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*/
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#include "net.h"
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#include "fec.h"
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#include "am79c874.h"
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#include "bas_printf.h"
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#if defined(MACHINE_FIREBEE)
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#include "firebee.h"
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#elif defined(MACHINE_M5484LITE)
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#include "m5484l.h"
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#elif defined(MACHINE_M54455)
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#include "m54455.h"
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#else
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#error "unknown machine!"
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#endif
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//#define DBG_AM79
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#ifdef DBG_AM79
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#define dbg(format, arg...) do { xprintf("DEBUG: " format, ##arg); } while (0)
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#else
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#define dbg(format, arg...) do { ; } while (0)
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#endif /* DBG_AM79 */
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/********************************************************************/
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/* Initialize the AM79C874 PHY
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*
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* This function sets up the Auto-Negotiate Advertisement register
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* within the PHY and then forces the PHY to auto-negotiate for
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* it's settings.
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*
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* Params:
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* fec_ch FEC channel
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* phy_addr Address of the PHY.
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* speed Desired speed (10BaseT or 100BaseTX)
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* duplex Desired duplex (Full or Half)
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*
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* Return Value:
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* 0 if MII commands fail
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* 1 otherwise
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*/
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int am79c874_init(uint8_t fec_ch, uint8_t phy_addr, uint8_t speed, uint8_t duplex)
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{
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int timeout;
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uint16_t settings;
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if (speed); /* to do */
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if (duplex); /* to do */
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/* Initialize the MII interface */
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fec_mii_init(fec_ch, SYSCLK / 1000);
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dbg("%s: PHY reset\r\n", __FUNCTION__);
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/* Reset the PHY */
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if (!fec_mii_write(fec_ch, phy_addr, MII_AM79C874_CR, MII_AM79C874_CR_RESET))
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return 0;
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/* Wait for the PHY to reset */
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for (timeout = 0; timeout < FEC_MII_TIMEOUT; timeout++)
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{
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fec_mii_read(fec_ch, phy_addr, MII_AM79C874_CR, &settings);
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if (!(settings & MII_AM79C874_CR_RESET))
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break;
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}
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if (timeout >= FEC_MII_TIMEOUT)
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{
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dbg("%s: PHY reset failed\r\n", __FUNCTION__);
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return 0;
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};
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dbg("%s: PHY reset OK\r\n", __FUNCTION__);
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dbg("%s: PHY Enable Auto-Negotiation\r\n", __FUNCTION__);
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/* Enable Auto-Negotiation */
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if (!fec_mii_write(fec_ch, phy_addr, MII_AM79C874_CR, MII_AM79C874_CR_AUTON | MII_AM79C874_CR_RST_NEG))
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return 0;
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dbg("%s:PHY Wait for auto-negotiation to complete\r\n", __FUNCTION__);
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/* Wait for auto-negotiation to complete */
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for (timeout = 0; timeout < FEC_MII_TIMEOUT; timeout++)
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{
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settings = 0;
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fec_mii_read(fec_ch, phy_addr, MII_AM79C874_SR, &settings);
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if ((settings & AUTONEGLINK) == AUTONEGLINK)
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break;
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}
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if (timeout >= FEC_MII_TIMEOUT)
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{
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dbg("%s: Auto-negotiation failed (timeout). Set default mode (100Mbps, full duplex)\r\n", __FUNCTION__);
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/* Set the default mode (Full duplex, 100 Mbps) */
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if (!fec_mii_write(fec_ch, phy_addr, MII_AM79C874_CR, MII_AM79C874_CR_100MB | MII_AM79C874_CR_DPLX))
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{
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dbg("%s: forced setting 100Mbps/full failed.\r\n", __FUNCTION__);
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return 0;
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}
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}
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#ifdef DBG_AM79
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settings = 0;
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fec_mii_read(fec_ch, phy_addr, MII_AM79C874_DR, &settings);
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dbg("%s: PHY Mode:\r\n", __FUNCTION__);
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if (settings & MII_AM79C874_DR_DATA_RATE)
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dbg("%s: 100Mbps", __FUNCTION__);
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else
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dbg("%s: 10Mbps ", __FUNCTION__);
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if (settings & MII_AM79C874_DR_DPLX)
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dbg("%s: Full-duplex\r\n", __FUNCTION__);
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else
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dbg("%s: Half-duplex\r\n", __FUNCTION__);
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dbg("%s:PHY auto-negotiation complete\r\n", __FUNCTION__);
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#endif /* DBG_AM79 */
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return 1;
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}
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