amd8111e.c

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/* Advanced  Micro Devices Inc. AMD8111E Linux Network Driver 
 * Copyright (C) 2004 Advanced Micro Devices 
 * Copyright (C) 2005 Liu Tao <liutao1980@gmail.com> [etherboot port]
 * 
 * Copyright 2001,2002 Jeff Garzik <jgarzik@mandrakesoft.com> [ 8139cp.c,tg3.c ]
 * Copyright (C) 2001, 2002 David S. Miller (davem@redhat.com)[ tg3.c]
 * Copyright 1996-1999 Thomas Bogendoerfer [ pcnet32.c ]
 * Derived from the lance driver written 1993,1994,1995 by Donald Becker.
 * Copyright 1993 United States Government as represented by the
 *      Director, National Security Agency.[ pcnet32.c ]
 * Carsten Langgaard, carstenl@mips.com [ pcnet32.c ]
 * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 *
 * 
 * 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
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include "etherboot.h"
#include "nic.h"
#include "mii.h"
#include <gpxe/pci.h>
#include <gpxe/ethernet.h>
#include "string.h"
#include "stdint.h"
#include "amd8111e.h"


/* driver definitions */
#define NUM_TX_SLOTS    2
#define NUM_RX_SLOTS    4
#define TX_SLOTS_MASK   1
#define RX_SLOTS_MASK   3

#define TX_BUF_LEN      1536
#define RX_BUF_LEN      1536

#define TX_PKT_LEN_MAX  (ETH_FRAME_LEN - ETH_HLEN)
#define RX_PKT_LEN_MIN  60
#define RX_PKT_LEN_MAX  ETH_FRAME_LEN

#define TX_TIMEOUT      3000
#define TX_PROCESS_TIME 10
#define TX_RETRY        (TX_TIMEOUT / TX_PROCESS_TIME)

#define PHY_RW_RETRY    10


struct amd8111e_tx_desc {
        u16 buf_len;
        u16 tx_flags;
        u16 tag_ctrl_info;
        u16 tag_ctrl_cmd;
        u32 buf_phy_addr;
        u32 reserved;
}; 

struct amd8111e_rx_desc {
        u32 reserved;
        u16 msg_len;
        u16 tag_ctrl_info; 
        u16 buf_len;
        u16 rx_flags;
        u32 buf_phy_addr;
};

struct eth_frame {
        u8 dst_addr[ETH_ALEN];
        u8 src_addr[ETH_ALEN];
        u16 type;
        u8 data[ETH_FRAME_LEN - ETH_HLEN];
} __attribute__((packed));

struct amd8111e_priv {
        struct amd8111e_tx_desc tx_ring[NUM_TX_SLOTS];
        struct amd8111e_rx_desc rx_ring[NUM_RX_SLOTS];
        unsigned char tx_buf[NUM_TX_SLOTS][TX_BUF_LEN];
        unsigned char rx_buf[NUM_RX_SLOTS][RX_BUF_LEN];
        unsigned long tx_idx, rx_idx;
        int tx_consistent;

        char opened;
        char link;
        char speed;
        char duplex;
        int ext_phy_addr;
        u32 ext_phy_id;

        struct pci_device *pdev;
        struct nic *nic;
        void *mmio;
};

static struct amd8111e_priv amd8111e;


/********************************************************
 *              locale functions                        *
 ********************************************************/
static void amd8111e_init_hw_default(struct amd8111e_priv *lp);
static int amd8111e_start(struct amd8111e_priv *lp);
static int amd8111e_read_phy(struct amd8111e_priv *lp, int phy_addr, int reg, u32 *val);
#if 0
static int amd8111e_write_phy(struct amd8111e_priv *lp, int phy_addr, int reg, u32 val);
#endif
static void amd8111e_probe_ext_phy(struct amd8111e_priv *lp);
static void amd8111e_disable_interrupt(struct amd8111e_priv *lp);
static void amd8111e_enable_interrupt(struct amd8111e_priv *lp);
static void amd8111e_force_interrupt(struct amd8111e_priv *lp);
static int amd8111e_get_mac_address(struct amd8111e_priv *lp);
static int amd8111e_init_rx_ring(struct amd8111e_priv *lp);
static int amd8111e_init_tx_ring(struct amd8111e_priv *lp);
static int amd8111e_wait_tx_ring(struct amd8111e_priv *lp, unsigned int index);
static void amd8111e_wait_link(struct amd8111e_priv *lp);
static void amd8111e_poll_link(struct amd8111e_priv *lp);
static void amd8111e_restart(struct amd8111e_priv *lp);


/* 
 * This function clears necessary the device registers. 
 */     
static void amd8111e_init_hw_default(struct amd8111e_priv *lp)
{
        unsigned int reg_val;
        void *mmio = lp->mmio;

        /* stop the chip */
        writel(RUN, mmio + CMD0);

        /* Clear RCV_RING_BASE_ADDR */
        writel(0, mmio + RCV_RING_BASE_ADDR0);

        /* Clear XMT_RING_BASE_ADDR */
        writel(0, mmio + XMT_RING_BASE_ADDR0);
        writel(0, mmio + XMT_RING_BASE_ADDR1);
        writel(0, mmio + XMT_RING_BASE_ADDR2);
        writel(0, mmio + XMT_RING_BASE_ADDR3);

        /* Clear CMD0  */
        writel(CMD0_CLEAR, mmio + CMD0);
        
        /* Clear CMD2 */
        writel(CMD2_CLEAR, mmio + CMD2);

        /* Clear CMD7 */
        writel(CMD7_CLEAR, mmio + CMD7);

        /* Clear DLY_INT_A and DLY_INT_B */
        writel(0x0, mmio + DLY_INT_A);
        writel(0x0, mmio + DLY_INT_B);

        /* Clear FLOW_CONTROL */
        writel(0x0, mmio + FLOW_CONTROL);

        /* Clear INT0  write 1 to clear register */
        reg_val = readl(mmio + INT0);
        writel(reg_val, mmio + INT0);

        /* Clear STVAL */
        writel(0x0, mmio + STVAL);

        /* Clear INTEN0 */
        writel(INTEN0_CLEAR, mmio + INTEN0);

        /* Clear LADRF */
        writel(0x0, mmio + LADRF);

        /* Set SRAM_SIZE & SRAM_BOUNDARY registers  */
        writel(0x80010, mmio + SRAM_SIZE);

        /* Clear RCV_RING0_LEN */
        writel(0x0, mmio +  RCV_RING_LEN0);

        /* Clear XMT_RING0/1/2/3_LEN */
        writel(0x0, mmio +  XMT_RING_LEN0);
        writel(0x0, mmio +  XMT_RING_LEN1);
        writel(0x0, mmio +  XMT_RING_LEN2);
        writel(0x0, mmio +  XMT_RING_LEN3);

        /* Clear XMT_RING_LIMIT */
        writel(0x0, mmio + XMT_RING_LIMIT);

        /* Clear MIB */
        writew(MIB_CLEAR, mmio + MIB_ADDR);

        /* Clear LARF */
        writel( 0, mmio + LADRF);
        writel( 0, mmio + LADRF + 4);

        /* SRAM_SIZE register */
        reg_val = readl(mmio + SRAM_SIZE);
        
        /* Set default value to CTRL1 Register */
        writel(CTRL1_DEFAULT, mmio + CTRL1);

        /* To avoid PCI posting bug */
        readl(mmio + CMD2);
}

/* 
 * This function initializes the device registers  and starts the device.  
 */
static int amd8111e_start(struct amd8111e_priv *lp)
{
        struct nic *nic = lp->nic;
        void *mmio = lp->mmio;
        int i, reg_val;

        /* stop the chip */
        writel(RUN, mmio + CMD0);

        /* AUTOPOLL0 Register *//*TBD default value is 8100 in FPS */
        writew(0x8100 | lp->ext_phy_addr, mmio + AUTOPOLL0);

        /* enable the port manager and set auto negotiation always */
        writel(VAL1 | EN_PMGR, mmio + CMD3 );
        writel(XPHYANE | XPHYRST, mmio + CTRL2); 

        /* set control registers */
        reg_val = readl(mmio + CTRL1);
        reg_val &= ~XMTSP_MASK;
        writel(reg_val | XMTSP_128 | CACHE_ALIGN, mmio + CTRL1);

        /* initialize tx and rx ring base addresses */
        amd8111e_init_tx_ring(lp);
        amd8111e_init_rx_ring(lp);
        writel(virt_to_bus(lp->tx_ring), mmio + XMT_RING_BASE_ADDR0);
        writel(virt_to_bus(lp->rx_ring), mmio + RCV_RING_BASE_ADDR0);
        writew(NUM_TX_SLOTS, mmio + XMT_RING_LEN0);
        writew(NUM_RX_SLOTS, mmio + RCV_RING_LEN0);
        
        /* set default IPG to 96 */
        writew(DEFAULT_IPG, mmio + IPG);
        writew(DEFAULT_IPG - IFS1_DELTA, mmio + IFS1); 

        /* AutoPAD transmit, Retransmit on Underflow */
        writel(VAL0 | APAD_XMT | REX_RTRY | REX_UFLO, mmio + CMD2);
        
        /* JUMBO disabled */
        writel(JUMBO, mmio + CMD3);

        /* Setting the MAC address to the device */
        for(i = 0; i < ETH_ALEN; i++)
                writeb(nic->node_addr[i], mmio + PADR + i); 

        /* set RUN bit to start the chip, interrupt not enabled */
        writel(VAL2 | RDMD0 | VAL0 | RUN, mmio + CMD0);
        
        /* To avoid PCI posting bug */
        readl(mmio + CMD0);
        return 0;
}

/* 
This function will read the PHY registers.
*/
static int amd8111e_read_phy(struct amd8111e_priv *lp, int phy_addr, int reg, u32 *val)
{
        void *mmio = lp->mmio;
        unsigned int reg_val;
        unsigned int retry = PHY_RW_RETRY;

        reg_val = readl(mmio + PHY_ACCESS);
        while (reg_val & PHY_CMD_ACTIVE)
                reg_val = readl(mmio + PHY_ACCESS);

        writel(PHY_RD_CMD | ((phy_addr & 0x1f) << 21) | ((reg & 0x1f) << 16),
                mmio + PHY_ACCESS);
        do {
                reg_val = readl(mmio + PHY_ACCESS);
                udelay(30);  /* It takes 30 us to read/write data */
        } while (--retry && (reg_val & PHY_CMD_ACTIVE));

        if (reg_val & PHY_RD_ERR) {
                *val = 0;
                return -1;
        }
        
        *val = reg_val & 0xffff;
        return 0;
}

/* 
This function will write into PHY registers. 
*/
#if 0
static int amd8111e_write_phy(struct amd8111e_priv *lp, int phy_addr, int reg, u32 val)
{
        void *mmio = lp->mmio;
        unsigned int reg_val;
        unsigned int retry = PHY_RW_RETRY;

        reg_val = readl(mmio + PHY_ACCESS);
        while (reg_val & PHY_CMD_ACTIVE)
                reg_val = readl(mmio + PHY_ACCESS);

        writel(PHY_WR_CMD | ((phy_addr & 0x1f) << 21) | ((reg & 0x1f) << 16) | val,
                mmio + PHY_ACCESS);
        do {
                reg_val = readl(mmio + PHY_ACCESS);
                udelay(30);  /* It takes 30 us to read/write the data */
        } while (--retry && (reg_val & PHY_CMD_ACTIVE));
        
        if(reg_val & PHY_RD_ERR)
                return -1;

        return 0;
}
#endif

static void amd8111e_probe_ext_phy(struct amd8111e_priv *lp)
{
        int i;

        lp->ext_phy_id = 0;
        lp->ext_phy_addr = 1;
        
        for (i = 0x1e; i >= 0; i--) {
                u32 id1, id2;

                if (amd8111e_read_phy(lp, i, MII_PHYSID1, &id1))
                        continue;
                if (amd8111e_read_phy(lp, i, MII_PHYSID2, &id2))
                        continue;
                lp->ext_phy_id = (id1 << 16) | id2;
                lp->ext_phy_addr = i;
                break;
        }

        if (lp->ext_phy_id)
                printf("Found MII PHY ID 0x%08x at address 0x%02x\n",
                       (unsigned int) lp->ext_phy_id, lp->ext_phy_addr);
        else
                printf("Couldn't detect MII PHY, assuming address 0x01\n");
}

static void amd8111e_disable_interrupt(struct amd8111e_priv *lp)
{
        void *mmio = lp->mmio;
        unsigned int int0;

        writel(INTREN, mmio + CMD0);
        writel(INTEN0_CLEAR, mmio + INTEN0);
        int0 = readl(mmio + INT0);
        writel(int0, mmio + INT0);
        readl(mmio + INT0);
}

static void amd8111e_enable_interrupt(struct amd8111e_priv *lp)
{
        void *mmio = lp->mmio;

        writel(VAL3 | LCINTEN | VAL1 | TINTEN0 | VAL0 | RINTEN0, mmio + INTEN0);
        writel(VAL0 | INTREN, mmio + CMD0);
        readl(mmio + CMD0);
}

static void amd8111e_force_interrupt(struct amd8111e_priv *lp)
{
        void *mmio = lp->mmio;

        writel(VAL0 | UINTCMD, mmio + CMD0);
        readl(mmio + CMD0);
}

static int amd8111e_get_mac_address(struct amd8111e_priv *lp)
{
        struct nic *nic = lp->nic;
        void *mmio = lp->mmio;
        int i;

        /* BIOS should have set mac address to PADR register,
         * so we read PADR to get it.
         */
        for (i = 0; i < ETH_ALEN; i++)
                nic->node_addr[i] = readb(mmio + PADR + i);

        DBG ( "Ethernet addr: %s\n", eth_ntoa ( nic->node_addr ) );

        return 0;
}

static int amd8111e_init_rx_ring(struct amd8111e_priv *lp)
{
        int i;

        lp->rx_idx = 0;
        
        /* Initilaizing receive descriptors */
        for (i = 0; i < NUM_RX_SLOTS; i++) {
                lp->rx_ring[i].buf_phy_addr = cpu_to_le32(virt_to_bus(lp->rx_buf[i]));
                lp->rx_ring[i].buf_len = cpu_to_le16(RX_BUF_LEN);
                wmb();
                lp->rx_ring[i].rx_flags = cpu_to_le16(OWN_BIT);
        }

        return 0;
}

static int amd8111e_init_tx_ring(struct amd8111e_priv *lp)
{
        int i;

        lp->tx_idx = 0;
        lp->tx_consistent = 1;
        
        /* Initializing transmit descriptors */
        for (i = 0; i < NUM_TX_SLOTS; i++) {
                lp->tx_ring[i].tx_flags = 0;
                lp->tx_ring[i].buf_phy_addr = 0;
                lp->tx_ring[i].buf_len = 0;
        }

        return 0;
}

static int amd8111e_wait_tx_ring(struct amd8111e_priv *lp, unsigned int index)
{
        volatile u16 status;
        int retry = TX_RETRY;

        status = le16_to_cpu(lp->tx_ring[index].tx_flags);
        while (--retry && (status & OWN_BIT)) {
                mdelay(TX_PROCESS_TIME);
                status = le16_to_cpu(lp->tx_ring[index].tx_flags);
        }
        if (status & OWN_BIT) {
                printf("Error: tx slot %d timeout, stat = 0x%x\n", index, status);
                amd8111e_restart(lp);
                return -1;
        }

        return 0;
}

static void amd8111e_wait_link(struct amd8111e_priv *lp)
{
        unsigned int status;
        u32 reg_val;

        do {
                /* read phy to update STAT0 register */
                amd8111e_read_phy(lp, lp->ext_phy_addr, MII_BMCR, &reg_val);
                amd8111e_read_phy(lp, lp->ext_phy_addr, MII_BMSR, &reg_val);
                amd8111e_read_phy(lp, lp->ext_phy_addr, MII_ADVERTISE, &reg_val);
                amd8111e_read_phy(lp, lp->ext_phy_addr, MII_LPA, &reg_val);
                status = readl(lp->mmio + STAT0);
        } while (!(status & AUTONEG_COMPLETE) || !(status & LINK_STATS));
}

static void amd8111e_poll_link(struct amd8111e_priv *lp)
{
        unsigned int status, speed;
        u32 reg_val;

        if (!lp->link) {
                /* read phy to update STAT0 register */
                amd8111e_read_phy(lp, lp->ext_phy_addr, MII_BMCR, &reg_val);
                amd8111e_read_phy(lp, lp->ext_phy_addr, MII_BMSR, &reg_val);
                amd8111e_read_phy(lp, lp->ext_phy_addr, MII_ADVERTISE, &reg_val);
                amd8111e_read_phy(lp, lp->ext_phy_addr, MII_LPA, &reg_val);
                status = readl(lp->mmio + STAT0);

                if (status & LINK_STATS) {
                        lp->link = 1;
                        speed = (status & SPEED_MASK) >> 7;
                        if (speed == PHY_SPEED_100)
                                lp->speed = 1;
                        else
                                lp->speed = 0;
                        if (status & FULL_DPLX)
                                lp->duplex = 1;
                        else
                                lp->duplex = 0;

                        printf("Link is up: %s Mbps %s duplex\n",
                                lp->speed ? "100" : "10", lp->duplex ? "full" : "half");
                }
        } else {
                status = readl(lp->mmio + STAT0);
                if (!(status & LINK_STATS)) {
                        lp->link = 0;
                        printf("Link is down\n");
                }
        }
}

static void amd8111e_restart(struct amd8111e_priv *lp)
{
        printf("\nStarting nic...\n");
        amd8111e_disable_interrupt(lp);
        amd8111e_init_hw_default(lp);
        amd8111e_probe_ext_phy(lp);
        amd8111e_get_mac_address(lp);
        amd8111e_start(lp);

        printf("Waiting link up...\n");
        lp->link = 0;
        amd8111e_wait_link(lp);
        amd8111e_poll_link(lp);
}


/********************************************************
 *              Interface Functions                     *
 ********************************************************/

static void amd8111e_transmit(struct nic *nic, const char *dst_addr,
                unsigned int type, unsigned int size, const char *packet)
{
        struct amd8111e_priv *lp = nic->priv_data;
        struct eth_frame *frame;
        unsigned int index;

        /* check packet size */
        if (size > TX_PKT_LEN_MAX) {
                printf("amd8111e_transmit(): too large packet, drop\n");
                return;
        }

        /* get tx slot */
        index = lp->tx_idx;
        if (amd8111e_wait_tx_ring(lp, index))
                return;

        /* fill frame */
        frame = (struct eth_frame *)lp->tx_buf[index];
        memset(frame->data, 0, TX_PKT_LEN_MAX);
        memcpy(frame->dst_addr, dst_addr, ETH_ALEN);
        memcpy(frame->src_addr, nic->node_addr, ETH_ALEN);
        frame->type = htons(type);
        memcpy(frame->data, packet, size);

        /* start xmit */
        lp->tx_ring[index].buf_len = cpu_to_le16(ETH_HLEN + size);
        lp->tx_ring[index].buf_phy_addr = cpu_to_le32(virt_to_bus(frame));
        wmb();
        lp->tx_ring[index].tx_flags = 
                cpu_to_le16(OWN_BIT | STP_BIT | ENP_BIT | ADD_FCS_BIT | LTINT_BIT);
        writel(VAL1 | TDMD0, lp->mmio + CMD0);
        readl(lp->mmio + CMD0);

        /* update slot pointer */
        lp->tx_idx = (lp->tx_idx + 1) & TX_SLOTS_MASK;
}

static int amd8111e_poll(struct nic *nic, int retrieve)
{
        /* return true if there's an ethernet packet ready to read */
        /* nic->packet should contain data on return */
        /* nic->packetlen should contain length of data */

        struct amd8111e_priv *lp = nic->priv_data;
        u16 status, pkt_len;
        unsigned int index, pkt_ok;

        amd8111e_poll_link(lp);

        index = lp->rx_idx;
        status = le16_to_cpu(lp->rx_ring[index].rx_flags);
        pkt_len = le16_to_cpu(lp->rx_ring[index].msg_len) - 4;  /* remove 4bytes FCS */
        
        if (status & OWN_BIT)
                return 0;

        if (status & ERR_BIT)
                pkt_ok = 0;
        else if (!(status & STP_BIT))
                pkt_ok = 0;
        else if (!(status & ENP_BIT))
                pkt_ok = 0;
        else if (pkt_len < RX_PKT_LEN_MIN)
                pkt_ok = 0;
        else if (pkt_len > RX_PKT_LEN_MAX)
                pkt_ok = 0;
        else
                pkt_ok = 1;

        if (pkt_ok) {
                if (!retrieve)
                        return 1;
                nic->packetlen = pkt_len;
                memcpy(nic->packet, lp->rx_buf[index], nic->packetlen);
        }

        lp->rx_ring[index].buf_phy_addr = cpu_to_le32(virt_to_bus(lp->rx_buf[index]));
        lp->rx_ring[index].buf_len = cpu_to_le16(RX_BUF_LEN);
        wmb();
        lp->rx_ring[index].rx_flags = cpu_to_le16(OWN_BIT);
        writel(VAL2 | RDMD0, lp->mmio + CMD0);
        readl(lp->mmio + CMD0);

        lp->rx_idx = (lp->rx_idx + 1) & RX_SLOTS_MASK;
        return pkt_ok;
}

static void amd8111e_disable(struct nic *nic)
{
        struct amd8111e_priv *lp = nic->priv_data;

        /* disable interrupt */
        amd8111e_disable_interrupt(lp);

        /* stop chip */
        amd8111e_init_hw_default(lp);

        /* unmap mmio */
        iounmap(lp->mmio);

        /* update status */
        lp->opened = 0;
}

static void amd8111e_irq(struct nic *nic, irq_action_t action)
{
        struct amd8111e_priv *lp = nic->priv_data;
                
        switch (action) {
        case DISABLE:
                amd8111e_disable_interrupt(lp);
                break;
        case ENABLE:
                amd8111e_enable_interrupt(lp);
                break;
        case FORCE:
                amd8111e_force_interrupt(lp);
                break;
        }
}

static struct nic_operations amd8111e_operations = {
        .connect        = dummy_connect,
        .poll           = amd8111e_poll,
        .transmit       = amd8111e_transmit,
        .irq            = amd8111e_irq,
};

static int amd8111e_probe(struct nic *nic, struct pci_device *pdev)
{
        struct amd8111e_priv *lp = &amd8111e;
        unsigned long mmio_start, mmio_len;

        nic->ioaddr = pdev->ioaddr;
        nic->irqno  = pdev->irq;
        
        mmio_start = pci_bar_start(pdev, PCI_BASE_ADDRESS_0);
        mmio_len = pci_bar_size(pdev, PCI_BASE_ADDRESS_0);

        memset(lp, 0, sizeof(*lp));
        lp->pdev = pdev;
        lp->nic = nic;
        lp->mmio = ioremap(mmio_start, mmio_len);
        lp->opened = 1;
        adjust_pci_device(pdev);

        nic->priv_data = lp;

        amd8111e_restart(lp);

        nic->nic_op     = &amd8111e_operations;
        return 1;
}

static struct pci_device_id amd8111e_nics[] = {
        PCI_ROM(0x1022, 0x7462, "amd8111e",     "AMD8111E", 0),
};

PCI_DRIVER ( amd8111e_driver, amd8111e_nics, PCI_NO_CLASS );

DRIVER ( "AMD8111E", nic_driver, pci_driver, amd8111e_driver,
         amd8111e_probe, amd8111e_disable );

/*
 * Local variables:
 *  c-basic-offset: 8
 *  c-indent-level: 8
 *  tab-width: 8
 * End:
 */