enet.c

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//#include "lwipopts.h"
#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/mem.h"
#include "lwip/pbuf.h"
#include "lwip/sys.h"
#include "lwip/stats.h"
#include "lwip/timers.h"
#include "netif/etharp.h"
 
#include <time/time.h>
#include <xenon_nand/xenon_config.h>
#include <ppc/cache.h>
#include <pci/io.h>
#include <xenon_smc/xenon_gpio.h>
 
#define TX_DESCRIPTOR_NUM 0x10
#define RX_DESCRIPTOR_NUM 0x10
#define MTU 1528
#define MEM(x) (0x80000000|(long)(x))
 
struct enet_context
{
    volatile uint32_t *rx_descriptor_base;
    void *rx_receive_base;
    int rx_descriptor_rptr;
 
    volatile uint32_t *tx_descriptor_base;
    int tx_descriptor_wptr;
    void *tx_buffer_base;
 
    struct eth_addr *ethaddr;
};
 
static int enet_open(struct netif *ctx);
static struct pbuf *enet_linkinput(struct enet_context *context);
static err_t enet_linkoutput(struct netif *netif, struct pbuf *p);
//static err_t enet_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr);
 
static unsigned short phy_read(int addr)
{
    write32n(0xea001444, __builtin_bswap32((addr << 11) | 0x50));
    do {mdelay(1);} while (__builtin_bswap32(read32n(0xea001444)) & 0x10);
    return __builtin_bswap32(read32n(0xea001444)) >> 16;
}
 
static void phy_write(int addr, unsigned short data)
{
    write32n(0xea001444, __builtin_bswap32((addr << 11) | 0x70 | (data << 16)));
    do {mdelay(1);} while (__builtin_bswap32(read32n(0xea001444)) & 0x10);
}
 
static void wait_empty_tx(struct enet_context *context)
{
//  printf(">> CURRENT TX PTR: %08x\n", __builtin_bswap32(read32n(0xea00140c)));
    while (__builtin_bswap32(context->tx_descriptor_base[context->tx_descriptor_wptr * 4 + 1]) & 0x80000000); // busy
}
 
static inline int virt_to_phys(volatile void *ptr)
{
    return ((long)ptr) & 0x7FFFFFFF;
}
 
static void tx_data(struct enet_context *context, unsigned char *data, int len)
{
    wait_empty_tx(context);
    int descnr = context->tx_descriptor_wptr;
    volatile uint32_t *descr = context->tx_descriptor_base + descnr * 4;
 
//  printf("using tx descriptor %d\n", descnr);
 
//  printf("really before %08x %08x %08x %08x\n", descr[0], descr[1], descr[2], descr[3]);
 
    descr[0] = __builtin_bswap32(len);
    descr[2] = __builtin_bswap32(virt_to_phys(data));
    descr[3] = __builtin_bswap32(len | ((descnr == TX_DESCRIPTOR_NUM - 1) ? 0x80000000 : 0));
    descr[1] = __builtin_bswap32(0xc0230000); // ownership, ...
 
//  printf("data at %08x\n", virt_to_phys(data));
 
    memdcbst((void*)descr, 0x10);
 
//  printf("before %08x %08x %08x %08x\n", descr[0], descr[1], descr[2], descr[3]);
 
    write32n(0xea001400, read32n(0xea001400) | __builtin_bswap32(0x10)); // Q0_START
 
//  printf("after %08x %08x %08x %08x\n", descr[0], descr[1], descr[2], descr[3]);
 
    context->tx_descriptor_wptr++;
    context->tx_descriptor_wptr %= TX_DESCRIPTOR_NUM;
 
    write32n(0xea001410, __builtin_bswap32(0x00101c11));    // enable RX
 
//  printf("TX\n");
}
 
static void tx_init(struct enet_context *context, void *base)
{
    int i;
 
    context->tx_descriptor_base = base;
    context->tx_descriptor_wptr = 0;
 
    for (i=0; i < TX_DESCRIPTOR_NUM; ++i)
    {
                /* tx descriptors */
        context->tx_descriptor_base[i * 4 + 0] = 0;
        context->tx_descriptor_base[i * 4 + 1] = 0;
        context->tx_descriptor_base[i * 4 + 2] = 0;
        if (i != TX_DESCRIPTOR_NUM - 1)
            context->tx_descriptor_base[i * 4 + 3] = 0;
        else
            context->tx_descriptor_base[i * 4 + 3] = __builtin_bswap32(0x80000000);
    }
 
    memdcbst((void*)context->tx_descriptor_base, TX_DESCRIPTOR_NUM * 0x10);
 
    context->tx_buffer_base = base + TX_DESCRIPTOR_NUM * 0x10;
 
    write32n(0xea001400, __builtin_bswap32(0x00001c00));
    write32n(0xea001404, __builtin_bswap32(virt_to_phys(context->tx_descriptor_base)));
    write32n(0xea001400, __builtin_bswap32(0x00011c00));
    write32n(0xea001404, __builtin_bswap32(virt_to_phys(context->tx_descriptor_base)));
    write32n(0xea001400, __builtin_bswap32(0x00001c00));
}
 
 
static void rx_init(struct enet_context *context, void *base)
{
    int i;
 
    context->rx_descriptor_base = base;
    context->rx_receive_base = base + RX_DESCRIPTOR_NUM * 0x10;
    context->rx_descriptor_rptr = 0;
 
            /* setup rx descriptors */
    for (i=0; i < RX_DESCRIPTOR_NUM; ++i)
    {
        context->rx_descriptor_base[i * 4 + 0] = __builtin_bswap32(0);
        context->rx_descriptor_base[i * 4 + 1] = __builtin_bswap32(0xc0000000);
        context->rx_descriptor_base[i * 4 + 2] = __builtin_bswap32(virt_to_phys(context->rx_receive_base + i * MTU));
        context->rx_descriptor_base[i * 4 + 3] = __builtin_bswap32(MTU | ((i == RX_DESCRIPTOR_NUM - 1) ? 0x80000000 : 0));
    }
    memdcbst((void*)context->rx_descriptor_base, RX_DESCRIPTOR_NUM * 0x10);
 
    write32n(0xea001414, __builtin_bswap32(virt_to_phys(context->rx_descriptor_base))); // RX queue start
    write32n(0xea001440, 0x1100004);
    write32n(0xea001450, 0);
}
 
 
//static void arp_timer(void *arg)
//{
//  etharp_tmr();
//  //sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
//}
 
err_t enet_init(struct netif *netif)
{
    struct enet_context * context;
 
    context = (struct enet_context *)mem_malloc(sizeof(struct enet_context));
    if(context == NULL) {
        printf("enet: Failed to allocate context memory.\n");
        return ERR_MEM;
    } else {
        memset(context, 0, sizeof(struct enet_context));
 
        // enet_write_mac_address(context, m);
        xenon_config_get_mac_addr(&netif->hwaddr[0]);
    }
 
    netif->state = context;
    netif->name[0] = 'e';
    netif->name[1] = 'n';
    netif->output = etharp_output; //enet_output; //lwip 1.3.0
    netif->linkoutput = enet_linkoutput;
    context->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
 
    netif->hwaddr_len = 6;
    netif->mtu = 1500;
    netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP;
 
#if LWIP_NETIF_HOSTNAME
    netif->hostname = "XeLL";
#endif
 
    //printf("NETIF at %p\n", netif);
 
    enet_open(netif);
    etharp_init();
    //sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
    return ERR_OK;
}
 
 
static int enet_open(struct netif *netif)
{
    int tries=10;
    struct enet_context *context = (struct enet_context *) netif->state;
 
    //printf("NIC reset\n");
    write32n(0xea001424, 0); // disable interrupts
    write32n(0xea001428, 0x01805508);
    //printf("reset: %08x\n", read32n(0xea001428));
    udelay(100);
    write32n(0xea001428, 0x01005508);
 
    write32n(0xea001444, __builtin_bswap32(4));
    udelay(100);
    write32n(0xea001444, __builtin_bswap32(0));
    //printf("1478 before: %08x\n", read32n(0xea001478));
        // Set MTU
    write32n(0xea001478, 0xf2050000); //printf("1478: %08x\n", read32n(0xea001478));
 
        // important
    write32n(0xea001450, 0x60230000);
 
        // mac 1+2
    write32n(0xea001478, 0xF2050000 | (netif->hwaddr[0] << 8) | (netif->hwaddr[1] << 0));
    write32n(0xea00147c, (netif->hwaddr[2] << 24) | (netif->hwaddr[3] << 16) | (netif->hwaddr[4] << 8) | (netif->hwaddr[5] << 0) );
 
    write32n(0xea001460, 0x380e0000 | (netif->hwaddr[0] << 8) | (netif->hwaddr[1] << 0));
    write32n(0xea001464, (netif->hwaddr[2] << 24) | (netif->hwaddr[3] << 16) | (netif->hwaddr[4] << 8) | (netif->hwaddr[5] << 0) );
 
        // multicast hash
    write32n(0xea001468, 0);
    write32n(0xea00146c, 0);
 
    write32n(0xea001400, 0x001c0000);
    write32n(0xea001410, __builtin_bswap32(0x00101c00));
 
    write32n(0xea001440, 0x01190004);
 
    void *base = (void*)memalign(0x10000,0x10000);
 
    //printf("init tx\n");
    tx_init(context, (void*)MEM(base));
    //printf("init rx\n");
    rx_init(context, (void*)MEM(base + 0x8000));
 
    write32n(0xea001440, 0x01100004);
 
#if 1
    printf("Reinit PHY...\n");
 
    // get PHY out of reset state
    xenon_gpio_control(0,0,0x10);
    xenon_gpio_control(4,0,0x10);
 
    phy_write(0, 0x9000);
 
    while (phy_read(0) & 0x8000){
        mdelay(500);
        tries--;
        if (tries<=0) break;        
    };
 
//  phy_write(0x10, 0x8058);
//  phy_write(4, 0x5e1);
//  phy_write(0x14, 0x4048);
 
    int linkstate = phy_read(1);
    if (!(linkstate & 4))
    {
        tries=10;
 
        printf("Waiting for link...");
        while (!(phy_read(1) & 4)){
            mdelay(500);
            tries--;
            if (tries<=0) break;
        };
    }
 
    if (phy_read(1) & 4) {
        printf("link up!\n");
        netif_set_link_up(netif);
    } else {
        printf("link still down.\n");
        netif_set_link_down(netif);
    }
#endif
 
 
//  write32n(0xea001428, 0x01805508);
    write32n(0xea001428, 0x01005508);
    write32n(0xea001410, __builtin_bswap32(0x00101c11));    // enable RX
    write32n(0xea001400, __builtin_bswap32(0x00001c01));    // enable TX
 
    return 0;
}
 
static struct pbuf *enet_linkinput(struct enet_context *context)
{
    volatile uint32_t *d = context->rx_descriptor_base + context->rx_descriptor_rptr * 4;
    memdcbf((void*)d, 0x10);
    if (__builtin_bswap32(d[1]) & 0x80000000) /* check ownership */
    {
//      printf("no data!\n");
        return 0;
    }
 
//  printf("RX descriptor %d contains data!\n", context->rx_descriptor_rptr);
//  printf("%08x %08x %08x %08x\n",
//      __builtin_bswap32(d[0]),
//      __builtin_bswap32(d[1]),
//      __builtin_bswap32(d[2]),
//      __builtin_bswap32(d[3]));
 
    int size = __builtin_bswap32(d[0]) & 0xFFFF;
    void *phys_addr = context->rx_receive_base + context->rx_descriptor_rptr * MTU;
    memdcbf(phys_addr, size);
 
    // hexdump(phys_addr, size);
 
    struct pbuf *p = pbuf_alloc(PBUF_RAW, size, PBUF_POOL), *q;
 
    if (p != NULL) {
        int rptr = 0;
        /* We iterate over the pbuf chain until we have read the entire
         packet into the pbuf. */
        for(q = p; q != NULL; q = q->next) {
                /* Read enough bytes to fill this pbuf in the chain. The
                     available data in the pbuf is given by the q->len
                     variable. */
            memcpy(q->payload, phys_addr + rptr, q->len);
            rptr += q->len;
        }
#ifdef LINK_STATS
        lwip_stats.link.recv++;
#endif /* LINK_STATS */
    } else {
#ifdef LINK_STATS
        lwip_stats.link.memerr++;
        lwip_stats.link.drop++;
#endif /* LINK_STATS */
    }
 
        /* reclaim descriptor */
    d[2] = __builtin_bswap32(virt_to_phys(context->rx_receive_base + context->rx_descriptor_rptr * MTU));
    d[3] = __builtin_bswap32(MTU | ((context->rx_descriptor_rptr == RX_DESCRIPTOR_NUM - 1) ? 0x80000000 : 0));
    d[0] = __builtin_bswap32(0);
    d[1] = __builtin_bswap32(0xc0000000);
    memdcbst((void*)d, 0x10);
 
    context->rx_descriptor_rptr++;
    context->rx_descriptor_rptr %= RX_DESCRIPTOR_NUM;
 
    return p;
}
 
static err_t enet_linkoutput(struct netif *netif, struct pbuf *p)
{
    struct pbuf *q;
    struct enet_context *context = (struct enet_context *) netif->state;
 
//  printf("enet linkoutput\n");
 
    void *dstptr = context->tx_buffer_base + context->tx_descriptor_wptr * MTU;
    int offset = 0;
 
    for(q = p; q != NULL; q = q->next) {
        memcpy(dstptr + offset, q->payload, q->len);
        offset += q->len;
    }
 
    memdcbst((void*)dstptr, p->tot_len);
    tx_data(context, dstptr, p->tot_len);
 
//  printf("ok, data transmitted!\n");
 
    return 0;
}
 
/*
static err_t
enet_output(struct netif *netif, struct pbuf *p,
            struct ip_addr_t *ipaddr)
{
//  printf("ENET OUTPUT\n");
  //return etharp_output(netif, ipaddr, p);
  return etharp_output(netif, p, ipaddr); //lwip 1.3.0
}
*/
 
static void
enet_input(struct netif *netif)
{
    struct enet_context *context = (struct enet_context *) netif->state;
    struct eth_hdr *ethhdr;
    struct pbuf *p;
 
    p = enet_linkinput(context);
 
    if (p == NULL)
        return;
 
#if LINK_STATS
    lwip_stats.link.recv++;
#endif /* LINK_STATS */
 
    ethhdr = p->payload;
 
    /* pass to network layer */
    if (ethernet_input(p, netif) != ERR_OK) {
        pbuf_free(p);
        p = NULL;
    }
}
 
int cnt;
 
void
enet_poll(struct netif *netif)
{
//  printf("\r%08x", mfdec());
    enet_input(netif);
}
 
 
void enet_quiesce(void)
{
    write32n(0xea001400, 0);
    write32n(0xea001410, 0);
}