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    /*
     * SMSC LAN9[12]1[567] Network driver
     *
    
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     * (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
    
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     *
     * See file CREDITS for list of people who contributed to this
     * project.
     *
     * 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 <command.h>
    #include <net.h>
    #include <miiphy.h>
    
    
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    u32 pkt_data_pull(u32 addr) \
    
    	__attribute__ ((weak, alias ("smc911x_reg_read")));
    
    void pkt_data_push(u32 addr, u32 val) \
    
    	__attribute__ ((weak, alias ("smc911x_reg_write")));
    
    #define mdelay(n)       udelay((n)*1000)
    
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    static int smx911x_handle_mac_address(bd_t *bd)
    {
    	unsigned long addrh, addrl;
    
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    	if (eth_getenv_enetaddr("ethaddr", m)) {
    		/* if the environment has a valid mac address then use it */
    		addrl = m[0] | (m[1] << 8) | (m[2] << 16) | (m[3] << 24);
    		addrh = m[4] | (m[5] << 8);
    		smc911x_set_mac_csr(ADDRL, addrl);
    		smc911x_set_mac_csr(ADDRH, addrh);
    	} else {
    
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    		/* if not, try to get one from the eeprom */
    		addrh = smc911x_get_mac_csr(ADDRH);
    		addrl = smc911x_get_mac_csr(ADDRL);
    
    		m[0] = (addrl       ) & 0xff;
    		m[1] = (addrl >>  8 ) & 0xff;
    		m[2] = (addrl >> 16 ) & 0xff;
    		m[3] = (addrl >> 24 ) & 0xff;
    		m[4] = (addrh       ) & 0xff;
    		m[5] = (addrh >>  8 ) & 0xff;
    
    		/* we get 0xff when there is no eeprom connected */
    		if ((m[0] & m[1] & m[2] & m[3] & m[4] & m[5]) == 0xff) {
    			printf(DRIVERNAME ": no valid mac address in environment "
    				"and no eeprom found\n");
    			return -1;
    		}
    
    
    		eth_setenv_enetaddr("ethaddr", m);
    
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    	}
    
    
    	printf(DRIVERNAME ": MAC %pM\n", m);
    
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    	return 0;
    }
    
    static int smc911x_miiphy_read(u8 phy, u8 reg, u16 *val)
    {
    
    	while (smc911x_get_mac_csr(MII_ACC) & MII_ACC_MII_BUSY)
    		;
    
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    	smc911x_set_mac_csr(MII_ACC, phy << 11 | reg << 6 | MII_ACC_MII_BUSY);
    
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    	while (smc911x_get_mac_csr(MII_ACC) & MII_ACC_MII_BUSY)
    		;
    
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    	*val = smc911x_get_mac_csr(MII_DATA);
    
    	return 0;
    }
    
    static int smc911x_miiphy_write(u8 phy, u8 reg, u16  val)
    {
    
    	while (smc911x_get_mac_csr(MII_ACC) & MII_ACC_MII_BUSY)
    		;
    
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    	smc911x_set_mac_csr(MII_DATA, val);
    	smc911x_set_mac_csr(MII_ACC,
    		phy << 11 | reg << 6 | MII_ACC_MII_BUSY | MII_ACC_MII_WRITE);
    
    
    	while (smc911x_get_mac_csr(MII_ACC) & MII_ACC_MII_BUSY)
    		;
    
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    	return 0;
    }
    
    static int smc911x_phy_reset(void)
    {
    	u32 reg;
    
    
    	reg = smc911x_reg_read(PMT_CTRL);
    
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    	reg &= ~0xfffff030;
    	reg |= PMT_CTRL_PHY_RST;
    
    	smc911x_reg_write(PMT_CTRL, reg);
    
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    	mdelay(100);
    
    	return 0;
    }
    
    static void smc911x_phy_configure(void)
    {
    	int timeout;
    	u16 status;
    
    	smc911x_phy_reset();
    
    	smc911x_miiphy_write(1, PHY_BMCR, PHY_BMCR_RESET);
    	mdelay(1);
    	smc911x_miiphy_write(1, PHY_ANAR, 0x01e1);
    	smc911x_miiphy_write(1, PHY_BMCR, PHY_BMCR_AUTON | PHY_BMCR_RST_NEG);
    
    	timeout = 5000;
    	do {
    		mdelay(1);
    		if ((timeout--) == 0)
    			goto err_out;
    
    		if (smc911x_miiphy_read(1, PHY_BMSR, &status) != 0)
    			goto err_out;
    	} while (!(status & PHY_BMSR_LS));
    
    	printf(DRIVERNAME ": phy initialized\n");
    
    	return;
    
    err_out:
    	printf(DRIVERNAME ": autonegotiation timed out\n");
    }
    
    static void smc911x_enable(void)
    {
    	/* Enable TX */
    
    	smc911x_reg_write(HW_CFG, 8 << 16 | HW_CFG_SF);
    
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    	smc911x_reg_write(GPT_CFG, GPT_CFG_TIMER_EN | 10000);
    
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    	smc911x_reg_write(TX_CFG, TX_CFG_TX_ON);
    
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    	/* no padding to start of packets */
    
    	smc911x_reg_write(RX_CFG, 0);
    
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    	smc911x_set_mac_csr(MAC_CR, MAC_CR_TXEN | MAC_CR_RXEN | MAC_CR_HBDIS);
    
    }
    
    int eth_init(bd_t *bd)
    {
    	printf(DRIVERNAME ": initializing\n");
    
    
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    		goto err_out;
    
    	smc911x_reset();
    
    	/* Configure the PHY, initialize the link state */
    	smc911x_phy_configure();
    
    	if (smx911x_handle_mac_address(bd))
    		goto err_out;
    
    	/* Turn on Tx + Rx */
    	smc911x_enable();
    
    	return 0;
    
    err_out:
    	return -1;
    }
    
    int eth_send(volatile void *packet, int length)
    {
    	u32 *data = (u32*)packet;
    	u32 tmplen;
    	u32 status;
    
    
    	smc911x_reg_write(TX_DATA_FIFO, TX_CMD_A_INT_FIRST_SEG | TX_CMD_A_INT_LAST_SEG | length);
    	smc911x_reg_write(TX_DATA_FIFO, length);
    
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    	tmplen = (length + 3) / 4;
    
    
    	while (tmplen--)
    
    		pkt_data_push(TX_DATA_FIFO, *data++);
    
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    	/* wait for transmission */
    
    	while (!((smc911x_reg_read(TX_FIFO_INF) & TX_FIFO_INF_TSUSED) >> 16));
    
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    	/* get status. Ignore 'no carrier' error, it has no meaning for
    	 * full duplex operation
    	 */
    
    	status = smc911x_reg_read(TX_STATUS_FIFO) & (TX_STS_LOC | TX_STS_LATE_COLL |
    
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    		TX_STS_MANY_COLL | TX_STS_MANY_DEFER | TX_STS_UNDERRUN);
    
    
    	if (!status)
    
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    		return 0;
    
    	printf(DRIVERNAME ": failed to send packet: %s%s%s%s%s\n",
    		status & TX_STS_LOC ? "TX_STS_LOC " : "",
    		status & TX_STS_LATE_COLL ? "TX_STS_LATE_COLL " : "",
    		status & TX_STS_MANY_COLL ? "TX_STS_MANY_COLL " : "",
    		status & TX_STS_MANY_DEFER ? "TX_STS_MANY_DEFER " : "",
    		status & TX_STS_UNDERRUN ? "TX_STS_UNDERRUN" : "");
    
    	return -1;
    }
    
    void eth_halt(void)
    {
    
    	smc911x_reset();
    
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    }
    
    int eth_rx(void)
    {
    	u32 *data = (u32 *)NetRxPackets[0];
    	u32 pktlen, tmplen;
    	u32 status;
    
    
    	if ((smc911x_reg_read(RX_FIFO_INF) & RX_FIFO_INF_RXSUSED) >> 16) {
    		status = smc911x_reg_read(RX_STATUS_FIFO);
    
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    		pktlen = (status & RX_STS_PKT_LEN) >> 16;
    
    
    		smc911x_reg_write(RX_CFG, 0);
    
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    		tmplen = (pktlen + 2+ 3) / 4;
    
    		while (tmplen--)
    
    			*data++ = pkt_data_pull(RX_DATA_FIFO);
    
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    		if (status & RX_STS_ES)
    
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    			printf(DRIVERNAME
    				": dropped bad packet. Status: 0x%08x\n",
    				status);
    		else
    			NetReceive(NetRxPackets[0], pktlen);
    	}
    
    	return 0;
    }