[mirror_qemu.git] / hw / net / etraxfs_eth.c

/*
 * QEMU ETRAX Ethernet Controller.
 *
 * Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "net/net.h"
#include "hw/cris/etraxfs.h"
#include "qemu/error-report.h"

#define D(x)

/* Advertisement control register. */
#define ADVERTISE_10HALF        0x0020  /* Try for 10mbps half-duplex  */
#define ADVERTISE_10FULL        0x0040  /* Try for 10mbps full-duplex  */
#define ADVERTISE_100HALF       0x0080  /* Try for 100mbps half-duplex */
#define ADVERTISE_100FULL       0x0100  /* Try for 100mbps full-duplex */

/*
 * The MDIO extensions in the TDK PHY model were reversed engineered from the
 * linux driver (PHYID and Diagnostics reg).
 * TODO: Add friendly names for the register nums.
 */
struct qemu_phy
{
    uint32_t regs[32];

    int link;

    unsigned int (*read)(struct qemu_phy *phy, unsigned int req);
    void (*write)(struct qemu_phy *phy, unsigned int req, unsigned int data);
};

static unsigned int tdk_read(struct qemu_phy *phy, unsigned int req)
{
    int regnum;
    unsigned r = 0;

    regnum = req & 0x1f;

    switch (regnum) {
    case 1:
        if (!phy->link) {
            break;
        }
        /* MR1.     */
        /* Speeds and modes.  */
        r |= (1 << 13) | (1 << 14);
        r |= (1 << 11) | (1 << 12);
        r |= (1 << 5); /* Autoneg complete.  */
        r |= (1 << 3); /* Autoneg able.     */
        r |= (1 << 2); /* link.     */
        break;
    case 5:
        /* Link partner ability.
           We are kind; always agree with whatever best mode
           the guest advertises.  */
        r = 1 << 14; /* Success.  */
        /* Copy advertised modes.  */
        r |= phy->regs[4] & (15 << 5);
        /* Autoneg support.  */
        r |= 1;
        break;
    case 18:
    {
        /* Diagnostics reg.  */
        int duplex = 0;
        int speed_100 = 0;

        if (!phy->link) {
            break;
        }

        /* Are we advertising 100 half or 100 duplex ? */
        speed_100 = !!(phy->regs[4] & ADVERTISE_100HALF);
        speed_100 |= !!(phy->regs[4] & ADVERTISE_100FULL);

        /* Are we advertising 10 duplex or 100 duplex ? */
        duplex = !!(phy->regs[4] & ADVERTISE_100FULL);
        duplex |= !!(phy->regs[4] & ADVERTISE_10FULL);
        r = (speed_100 << 10) | (duplex << 11);
    }
    break;

    default:
        r = phy->regs[regnum];
        break;
    }
    D(printf("\n%s %x = reg[%d]\n", __func__, r, regnum));
    return r;
}

static void
tdk_write(struct qemu_phy *phy, unsigned int req, unsigned int data)
{
    int regnum;

    regnum = req & 0x1f;
    D(printf("%s reg[%d] = %x\n", __func__, regnum, data));
    switch (regnum) {
    default:
        phy->regs[regnum] = data;
        break;
    }
}

static void
tdk_init(struct qemu_phy *phy)
{
    phy->regs[0] = 0x3100;
    /* PHY Id.  */
    phy->regs[2] = 0x0300;
    phy->regs[3] = 0xe400;
    /* Autonegotiation advertisement reg.  */
    phy->regs[4] = 0x01E1;
    phy->link = 1;

    phy->read = tdk_read;
    phy->write = tdk_write;
}

struct qemu_mdio
{
    /* bus.     */
    int mdc;
    int mdio;

    /* decoder.  */
    enum {
        PREAMBLE,
        SOF,
        OPC,
        ADDR,
        REQ,
        TURNAROUND,
        DATA
    } state;
    unsigned int drive;

    unsigned int cnt;
    unsigned int addr;
    unsigned int opc;
    unsigned int req;
    unsigned int data;

    struct qemu_phy *devs[32];
};

static void
mdio_attach(struct qemu_mdio *bus, struct qemu_phy *phy, unsigned int addr)
{
    bus->devs[addr & 0x1f] = phy;
}

#ifdef USE_THIS_DEAD_CODE
static void
mdio_detach(struct qemu_mdio *bus, struct qemu_phy *phy, unsigned int addr)
{
    bus->devs[addr & 0x1f] = NULL;
}
#endif

static void mdio_read_req(struct qemu_mdio *bus)
{
    struct qemu_phy *phy;

    phy = bus->devs[bus->addr];
    if (phy && phy->read) {
        bus->data = phy->read(phy, bus->req);
    } else {
        bus->data = 0xffff;
    }
}

static void mdio_write_req(struct qemu_mdio *bus)
{
    struct qemu_phy *phy;

    phy = bus->devs[bus->addr];
    if (phy && phy->write) {
        phy->write(phy, bus->req, bus->data);
    }
}

static void mdio_cycle(struct qemu_mdio *bus)
{
    bus->cnt++;

    D(printf("mdc=%d mdio=%d state=%d cnt=%d drv=%d\n",
        bus->mdc, bus->mdio, bus->state, bus->cnt, bus->drive));
#if 0
    if (bus->mdc) {
        printf("%d", bus->mdio);
    }
#endif
    switch (bus->state) {
    case PREAMBLE:
        if (bus->mdc) {
            if (bus->cnt >= (32 * 2) && !bus->mdio) {
                bus->cnt = 0;
                bus->state = SOF;
                bus->data = 0;
            }
        }
        break;
    case SOF:
        if (bus->mdc) {
            if (bus->mdio != 1) {
                printf("WARNING: no SOF\n");
            }
            if (bus->cnt == 1*2) {
                bus->cnt = 0;
                bus->opc = 0;
                bus->state = OPC;
            }
        }
        break;
    case OPC:
        if (bus->mdc) {
            bus->opc <<= 1;
            bus->opc |= bus->mdio & 1;
            if (bus->cnt == 2*2) {
                bus->cnt = 0;
                bus->addr = 0;
                bus->state = ADDR;
            }
        }
        break;
    case ADDR:
        if (bus->mdc) {
            bus->addr <<= 1;
            bus->addr |= bus->mdio & 1;

            if (bus->cnt == 5*2) {
                bus->cnt = 0;
                bus->req = 0;
                bus->state = REQ;
            }
        }
        break;
    case REQ:
        if (bus->mdc) {
            bus->req <<= 1;
            bus->req |= bus->mdio & 1;
            if (bus->cnt == 5*2) {
                bus->cnt = 0;
                bus->state = TURNAROUND;
            }
        }
        break;
    case TURNAROUND:
        if (bus->mdc && bus->cnt == 2*2) {
            bus->mdio = 0;
            bus->cnt = 0;

            if (bus->opc == 2) {
                bus->drive = 1;
                mdio_read_req(bus);
                bus->mdio = bus->data & 1;
            }
            bus->state = DATA;
        }
        break;
    case DATA:
        if (!bus->mdc) {
            if (bus->drive) {
                bus->mdio = !!(bus->data & (1 << 15));
                bus->data <<= 1;
            }
        } else {
            if (!bus->drive) {
                bus->data <<= 1;
                bus->data |= bus->mdio;
            }
            if (bus->cnt == 16 * 2) {
                bus->cnt = 0;
                bus->state = PREAMBLE;
                if (!bus->drive) {
                    mdio_write_req(bus);
                }
                bus->drive = 0;
            }
        }
        break;
    default:
        break;
    }
}

/* ETRAX-FS Ethernet MAC block starts here.  */

#define RW_MA0_LO      0x00
#define RW_MA0_HI      0x01
#define RW_MA1_LO      0x02
#define RW_MA1_HI      0x03
#define RW_GA_LO      0x04
#define RW_GA_HI      0x05
#define RW_GEN_CTRL      0x06
#define RW_REC_CTRL      0x07
#define RW_TR_CTRL      0x08
#define RW_CLR_ERR      0x09
#define RW_MGM_CTRL      0x0a
#define R_STAT          0x0b
#define FS_ETH_MAX_REGS      0x17

#define TYPE_ETRAX_FS_ETH "etraxfs-eth"
#define ETRAX_FS_ETH(obj) \
    OBJECT_CHECK(ETRAXFSEthState, (obj), TYPE_ETRAX_FS_ETH)

typedef struct ETRAXFSEthState
{
    SysBusDevice parent_obj;

    MemoryRegion mmio;
    NICState *nic;
    NICConf conf;

    /* Two addrs in the filter.  */
    uint8_t macaddr[2][6];
    uint32_t regs[FS_ETH_MAX_REGS];

    union {
        void *vdma_out;
        struct etraxfs_dma_client *dma_out;
    };
    union {
        void *vdma_in;
        struct etraxfs_dma_client *dma_in;
    };

    /* MDIO bus.  */
    struct qemu_mdio mdio_bus;
    unsigned int phyaddr;
    int duplex_mismatch;

    /* PHY.     */
    struct qemu_phy phy;
} ETRAXFSEthState;

static void eth_validate_duplex(ETRAXFSEthState *eth)
{
    struct qemu_phy *phy;
    unsigned int phy_duplex;
    unsigned int mac_duplex;
    int new_mm = 0;

    phy = eth->mdio_bus.devs[eth->phyaddr];
    phy_duplex = !!(phy->read(phy, 18) & (1 << 11));
    mac_duplex = !!(eth->regs[RW_REC_CTRL] & 128);

    if (mac_duplex != phy_duplex) {
        new_mm = 1;
    }

    if (eth->regs[RW_GEN_CTRL] & 1) {
        if (new_mm != eth->duplex_mismatch) {
            if (new_mm) {
                printf("HW: WARNING ETH duplex mismatch MAC=%d PHY=%d\n",
                       mac_duplex, phy_duplex);
            } else {
                printf("HW: ETH duplex ok.\n");
            }
        }
        eth->duplex_mismatch = new_mm;
    }
}

static uint64_t
eth_read(void *opaque, hwaddr addr, unsigned int size)
{
    ETRAXFSEthState *eth = opaque;
    uint32_t r = 0;

    addr >>= 2;

    switch (addr) {
    case R_STAT:
        r = eth->mdio_bus.mdio & 1;
        break;
    default:
        r = eth->regs[addr];
        D(printf("%s %x\n", __func__, addr * 4));
        break;
    }
    return r;
}

static void eth_update_ma(ETRAXFSEthState *eth, int ma)
{
    int reg;
    int i = 0;

    ma &= 1;

    reg = RW_MA0_LO;
    if (ma) {
        reg = RW_MA1_LO;
    }

    eth->macaddr[ma][i++] = eth->regs[reg];
    eth->macaddr[ma][i++] = eth->regs[reg] >> 8;
    eth->macaddr[ma][i++] = eth->regs[reg] >> 16;
    eth->macaddr[ma][i++] = eth->regs[reg] >> 24;
    eth->macaddr[ma][i++] = eth->regs[reg + 1];
    eth->macaddr[ma][i] = eth->regs[reg + 1] >> 8;

    D(printf("set mac%d=%x.%x.%x.%x.%x.%x\n", ma,
             eth->macaddr[ma][0], eth->macaddr[ma][1],
             eth->macaddr[ma][2], eth->macaddr[ma][3],
             eth->macaddr[ma][4], eth->macaddr[ma][5]));
}

static void
eth_write(void *opaque, hwaddr addr,
          uint64_t val64, unsigned int size)
{
    ETRAXFSEthState *eth = opaque;
    uint32_t value = val64;

    addr >>= 2;
    switch (addr) {
    case RW_MA0_LO:
    case RW_MA0_HI:
        eth->regs[addr] = value;
        eth_update_ma(eth, 0);
        break;
    case RW_MA1_LO:
    case RW_MA1_HI:
        eth->regs[addr] = value;
        eth_update_ma(eth, 1);
        break;

    case RW_MGM_CTRL:
        /* Attach an MDIO/PHY abstraction.  */
        if (value & 2) {
            eth->mdio_bus.mdio = value & 1;
        }
        if (eth->mdio_bus.mdc != (value & 4)) {
            mdio_cycle(&eth->mdio_bus);
            eth_validate_duplex(eth);
        }
        eth->mdio_bus.mdc = !!(value & 4);
        eth->regs[addr] = value;
        break;

    case RW_REC_CTRL:
        eth->regs[addr] = value;
        eth_validate_duplex(eth);
        break;

    default:
        eth->regs[addr] = value;
        D(printf("%s %x %x\n", __func__, addr, value));
        break;
    }
}

/* The ETRAX FS has a groupt address table (GAT) which works like a k=1 bloom
   filter dropping group addresses we have not joined.    The filter has 64
   bits (m). The has function is a simple nible xor of the group addr.    */
static int eth_match_groupaddr(ETRAXFSEthState *eth, const unsigned char *sa)
{
    unsigned int hsh;
    int m_individual = eth->regs[RW_REC_CTRL] & 4;
    int match;

    /* First bit on the wire of a MAC address signals multicast or
       physical address.  */
    if (!m_individual && !(sa[0] & 1)) {
        return 0;
    }

    /* Calculate the hash index for the GA registers. */
    hsh = 0;
    hsh ^= (*sa) & 0x3f;
    hsh ^= ((*sa) >> 6) & 0x03;
    ++sa;
    hsh ^= ((*sa) << 2) & 0x03c;
    hsh ^= ((*sa) >> 4) & 0xf;
    ++sa;
    hsh ^= ((*sa) << 4) & 0x30;
    hsh ^= ((*sa) >> 2) & 0x3f;
    ++sa;
    hsh ^= (*sa) & 0x3f;
    hsh ^= ((*sa) >> 6) & 0x03;
    ++sa;
    hsh ^= ((*sa) << 2) & 0x03c;
    hsh ^= ((*sa) >> 4) & 0xf;
    ++sa;
    hsh ^= ((*sa) << 4) & 0x30;
    hsh ^= ((*sa) >> 2) & 0x3f;

    hsh &= 63;
    if (hsh > 31) {
        match = eth->regs[RW_GA_HI] & (1 << (hsh - 32));
    } else {
        match = eth->regs[RW_GA_LO] & (1 << hsh);
    }
    D(printf("hsh=%x ga=%x.%x mtch=%d\n", hsh,
             eth->regs[RW_GA_HI], eth->regs[RW_GA_LO], match));
    return match;
}

static ssize_t eth_receive(NetClientState *nc, const uint8_t *buf, size_t size)
{
    unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
    ETRAXFSEthState *eth = qemu_get_nic_opaque(nc);
    int use_ma0 = eth->regs[RW_REC_CTRL] & 1;
    int use_ma1 = eth->regs[RW_REC_CTRL] & 2;
    int r_bcast = eth->regs[RW_REC_CTRL] & 8;

    if (size < 12) {
        return -1;
    }

    D(printf("%x.%x.%x.%x.%x.%x ma=%d %d bc=%d\n",
         buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
         use_ma0, use_ma1, r_bcast));

    /* Does the frame get through the address filters?  */
    if ((!use_ma0 || memcmp(buf, eth->macaddr[0], 6))
        && (!use_ma1 || memcmp(buf, eth->macaddr[1], 6))
        && (!r_bcast || memcmp(buf, sa_bcast, 6))
        && !eth_match_groupaddr(eth, buf)) {
        return size;
    }

    /* FIXME: Find another way to pass on the fake csum.  */
    etraxfs_dmac_input(eth->dma_in, (void *)buf, size + 4, 1);

    return size;
}

static int eth_tx_push(void *opaque, unsigned char *buf, int len, bool eop)
{
    ETRAXFSEthState *eth = opaque;

    D(printf("%s buf=%p len=%d\n", __func__, buf, len));
    qemu_send_packet(qemu_get_queue(eth->nic), buf, len);
    return len;
}

static void eth_set_link(NetClientState *nc)
{
    ETRAXFSEthState *eth = qemu_get_nic_opaque(nc);
    D(printf("%s %d\n", __func__, nc->link_down));
    eth->phy.link = !nc->link_down;
}

static const MemoryRegionOps eth_ops = {
    .read = eth_read,
    .write = eth_write,
    .endianness = DEVICE_LITTLE_ENDIAN,
    .valid = {
        .min_access_size = 4,
        .max_access_size = 4
    }
};

static NetClientInfo net_etraxfs_info = {
    .type = NET_CLIENT_DRIVER_NIC,
    .size = sizeof(NICState),
    .receive = eth_receive,
    .link_status_changed = eth_set_link,
};

static int fs_eth_init(SysBusDevice *sbd)
{
    DeviceState *dev = DEVICE(sbd);
    ETRAXFSEthState *s = ETRAX_FS_ETH(dev);

    if (!s->dma_out || !s->dma_in) {
        error_report("Unconnected ETRAX-FS Ethernet MAC");
        return -1;
    }

    s->dma_out->client.push = eth_tx_push;
    s->dma_out->client.opaque = s;
    s->dma_in->client.opaque = s;
    s->dma_in->client.pull = NULL;

    memory_region_init_io(&s->mmio, OBJECT(dev), &eth_ops, s,
                          "etraxfs-eth", 0x5c);
    sysbus_init_mmio(sbd, &s->mmio);

    qemu_macaddr_default_if_unset(&s->conf.macaddr);
    s->nic = qemu_new_nic(&net_etraxfs_info, &s->conf,
                          object_get_typename(OBJECT(s)), dev->id, s);
    qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);


    tdk_init(&s->phy);
    mdio_attach(&s->mdio_bus, &s->phy, s->phyaddr);
    return 0;
}

static Property etraxfs_eth_properties[] = {
    DEFINE_PROP_UINT32("phyaddr", ETRAXFSEthState, phyaddr, 1),
    DEFINE_PROP_PTR("dma_out", ETRAXFSEthState, vdma_out),
    DEFINE_PROP_PTR("dma_in", ETRAXFSEthState, vdma_in),
    DEFINE_NIC_PROPERTIES(ETRAXFSEthState, conf),
    DEFINE_PROP_END_OF_LIST(),
};

static void etraxfs_eth_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = fs_eth_init;
    dc->props = etraxfs_eth_properties;
    /* Reason: pointer properties "dma_out", "dma_in" */
    dc->user_creatable = false;
}

static const TypeInfo etraxfs_eth_info = {
    .name          = TYPE_ETRAX_FS_ETH,
    .parent        = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(ETRAXFSEthState),
    .class_init    = etraxfs_eth_class_init,
};

static void etraxfs_eth_register_types(void)
{
    type_register_static(&etraxfs_eth_info);
}

type_init(etraxfs_eth_register_types)
Commit	Line	Data
	1	/*
	2	* QEMU ETRAX Ethernet Controller.
	3	*
	4	* Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
	24
	25	#include "qemu/osdep.h"
	26	#include "hw/sysbus.h"
	27	#include "net/net.h"
	28	#include "hw/cris/etraxfs.h"
	29	#include "qemu/error-report.h"
	30
	31	#define D(x)
	32
	33	/* Advertisement control register. */
	34	#define ADVERTISE_10HALF 0x0020 /* Try for 10mbps half-duplex */
	35	#define ADVERTISE_10FULL 0x0040 /* Try for 10mbps full-duplex */
	36	#define ADVERTISE_100HALF 0x0080 /* Try for 100mbps half-duplex */
	37	#define ADVERTISE_100FULL 0x0100 /* Try for 100mbps full-duplex */
	38
	39	/*
	40	* The MDIO extensions in the TDK PHY model were reversed engineered from the
	41	* linux driver (PHYID and Diagnostics reg).
	42	* TODO: Add friendly names for the register nums.
	43	*/
	44	struct qemu_phy
	45	{
	46	uint32_t regs[32];
	47
	48	int link;
	49
	50	unsigned int (read)(struct qemu_phy phy, unsigned int req);
	51	void (write)(struct qemu_phy phy, unsigned int req, unsigned int data);
	52	};
	53
	54	static unsigned int tdk_read(struct qemu_phy *phy, unsigned int req)
	55	{
	56	int regnum;
	57	unsigned r = 0;
	58
	59	regnum = req & 0x1f;
	60
	61	switch (regnum) {
	62	case 1:
	63	if (!phy->link) {
	64	break;
	65	}
	66	/* MR1. */
	67	/* Speeds and modes. */
	68	r \|= (1 << 13) \| (1 << 14);
	69	r \|= (1 << 11) \| (1 << 12);
	70	r \|= (1 << 5); /* Autoneg complete. */
	71	r \|= (1 << 3); /* Autoneg able. */
	72	r \|= (1 << 2); /* link. */
	73	break;
	74	case 5:
	75	/* Link partner ability.
	76	We are kind; always agree with whatever best mode
	77	the guest advertises. */
	78	r = 1 << 14; /* Success. */
	79	/* Copy advertised modes. */
	80	r \|= phy->regs[4] & (15 << 5);
	81	/* Autoneg support. */
	82	r \|= 1;
	83	break;
	84	case 18:
	85	{
	86	/* Diagnostics reg. */
	87	int duplex = 0;
	88	int speed_100 = 0;
	89
	90	if (!phy->link) {
	91	break;
	92	}
	93
	94	/* Are we advertising 100 half or 100 duplex ? */
	95	speed_100 = !!(phy->regs[4] & ADVERTISE_100HALF);
	96	speed_100 \|= !!(phy->regs[4] & ADVERTISE_100FULL);
	97
	98	/* Are we advertising 10 duplex or 100 duplex ? */
	99	duplex = !!(phy->regs[4] & ADVERTISE_100FULL);
	100	duplex \|= !!(phy->regs[4] & ADVERTISE_10FULL);
	101	r = (speed_100 << 10) \| (duplex << 11);
	102	}
	103	break;
	104
	105	default:
	106	r = phy->regs[regnum];
	107	break;
	108	}
	109	D(printf("\n%s %x = reg[%d]\n", __func__, r, regnum));
	110	return r;
	111	}
	112
	113	static void
	114	tdk_write(struct qemu_phy *phy, unsigned int req, unsigned int data)
	115	{
	116	int regnum;
	117
	118	regnum = req & 0x1f;
	119	D(printf("%s reg[%d] = %x\n", __func__, regnum, data));
	120	switch (regnum) {
	121	default:
	122	phy->regs[regnum] = data;
	123	break;
	124	}
	125	}
	126
	127	static void
	128	tdk_init(struct qemu_phy *phy)
	129	{
	130	phy->regs[0] = 0x3100;
	131	/* PHY Id. */
	132	phy->regs[2] = 0x0300;
	133	phy->regs[3] = 0xe400;
	134	/* Autonegotiation advertisement reg. */
	135	phy->regs[4] = 0x01E1;
	136	phy->link = 1;
	137
	138	phy->read = tdk_read;
	139	phy->write = tdk_write;
	140	}
	141
	142	struct qemu_mdio
	143	{
	144	/* bus. */
	145	int mdc;
	146	int mdio;
	147
	148	/* decoder. */
	149	enum {
	150	PREAMBLE,
	151	SOF,
	152	OPC,
	153	ADDR,
	154	REQ,
	155	TURNAROUND,
	156	DATA
	157	} state;
	158	unsigned int drive;
	159
	160	unsigned int cnt;
	161	unsigned int addr;
	162	unsigned int opc;
	163	unsigned int req;
	164	unsigned int data;
	165
	166	struct qemu_phy *devs[32];
	167	};
	168
	169	static void
	170	mdio_attach(struct qemu_mdio bus, struct qemu_phy phy, unsigned int addr)
	171	{
	172	bus->devs[addr & 0x1f] = phy;
	173	}
	174
	175	#ifdef USE_THIS_DEAD_CODE
	176	static void
	177	mdio_detach(struct qemu_mdio bus, struct qemu_phy phy, unsigned int addr)
	178	{
	179	bus->devs[addr & 0x1f] = NULL;
	180	}
	181	#endif
	182
	183	static void mdio_read_req(struct qemu_mdio *bus)
	184	{
	185	struct qemu_phy *phy;
	186
	187	phy = bus->devs[bus->addr];
	188	if (phy && phy->read) {
	189	bus->data = phy->read(phy, bus->req);
	190	} else {
	191	bus->data = 0xffff;
	192	}
	193	}
	194
	195	static void mdio_write_req(struct qemu_mdio *bus)
	196	{
	197	struct qemu_phy *phy;
	198
	199	phy = bus->devs[bus->addr];
	200	if (phy && phy->write) {
	201	phy->write(phy, bus->req, bus->data);
	202	}
	203	}
	204
	205	static void mdio_cycle(struct qemu_mdio *bus)
	206	{
	207	bus->cnt++;
	208
	209	D(printf("mdc=%d mdio=%d state=%d cnt=%d drv=%d\n",
	210	bus->mdc, bus->mdio, bus->state, bus->cnt, bus->drive));
	211	#if 0
	212	if (bus->mdc) {
	213	printf("%d", bus->mdio);
	214	}
	215	#endif
	216	switch (bus->state) {
	217	case PREAMBLE:
	218	if (bus->mdc) {
	219	if (bus->cnt >= (32 * 2) && !bus->mdio) {
	220	bus->cnt = 0;
	221	bus->state = SOF;
	222	bus->data = 0;
	223	}
	224	}
	225	break;
	226	case SOF:
	227	if (bus->mdc) {
	228	if (bus->mdio != 1) {
	229	printf("WARNING: no SOF\n");
	230	}
	231	if (bus->cnt == 1*2) {
	232	bus->cnt = 0;
	233	bus->opc = 0;
	234	bus->state = OPC;
	235	}
	236	}
	237	break;
	238	case OPC:
	239	if (bus->mdc) {
	240	bus->opc <<= 1;
	241	bus->opc \|= bus->mdio & 1;
	242	if (bus->cnt == 2*2) {
	243	bus->cnt = 0;
	244	bus->addr = 0;
	245	bus->state = ADDR;
	246	}
	247	}
	248	break;
	249	case ADDR:
	250	if (bus->mdc) {
	251	bus->addr <<= 1;
	252	bus->addr \|= bus->mdio & 1;
	253
	254	if (bus->cnt == 5*2) {
	255	bus->cnt = 0;
	256	bus->req = 0;
	257	bus->state = REQ;
	258	}
	259	}
	260	break;
	261	case REQ:
	262	if (bus->mdc) {
	263	bus->req <<= 1;
	264	bus->req \|= bus->mdio & 1;
	265	if (bus->cnt == 5*2) {
	266	bus->cnt = 0;
	267	bus->state = TURNAROUND;
	268	}
	269	}
	270	break;
	271	case TURNAROUND:
	272	if (bus->mdc && bus->cnt == 2*2) {
	273	bus->mdio = 0;
	274	bus->cnt = 0;
	275
	276	if (bus->opc == 2) {
	277	bus->drive = 1;
	278	mdio_read_req(bus);
	279	bus->mdio = bus->data & 1;
	280	}
	281	bus->state = DATA;
	282	}
	283	break;
	284	case DATA:
	285	if (!bus->mdc) {
	286	if (bus->drive) {
	287	bus->mdio = !!(bus->data & (1 << 15));
	288	bus->data <<= 1;
	289	}
	290	} else {
	291	if (!bus->drive) {
	292	bus->data <<= 1;
	293	bus->data \|= bus->mdio;
	294	}
	295	if (bus->cnt == 16 * 2) {
	296	bus->cnt = 0;
	297	bus->state = PREAMBLE;
	298	if (!bus->drive) {
	299	mdio_write_req(bus);
	300	}
	301	bus->drive = 0;
	302	}
	303	}
	304	break;
	305	default:
	306	break;
	307	}
	308	}
	309
	310	/* ETRAX-FS Ethernet MAC block starts here. */
	311
	312	#define RW_MA0_LO 0x00
	313	#define RW_MA0_HI 0x01
	314	#define RW_MA1_LO 0x02
	315	#define RW_MA1_HI 0x03
	316	#define RW_GA_LO 0x04
	317	#define RW_GA_HI 0x05
	318	#define RW_GEN_CTRL 0x06
	319	#define RW_REC_CTRL 0x07
	320	#define RW_TR_CTRL 0x08
	321	#define RW_CLR_ERR 0x09
	322	#define RW_MGM_CTRL 0x0a
	323	#define R_STAT 0x0b
	324	#define FS_ETH_MAX_REGS 0x17
	325
	326	#define TYPE_ETRAX_FS_ETH "etraxfs-eth"
	327	#define ETRAX_FS_ETH(obj) \
	328	OBJECT_CHECK(ETRAXFSEthState, (obj), TYPE_ETRAX_FS_ETH)
	329
	330	typedef struct ETRAXFSEthState
	331	{
	332	SysBusDevice parent_obj;
	333
	334	MemoryRegion mmio;
	335	NICState *nic;
	336	NICConf conf;
	337
	338	/* Two addrs in the filter. */
	339	uint8_t macaddr[2][6];
	340	uint32_t regs[FS_ETH_MAX_REGS];
	341
	342	union {
	343	void *vdma_out;
	344	struct etraxfs_dma_client *dma_out;
	345	};
	346	union {
	347	void *vdma_in;
	348	struct etraxfs_dma_client *dma_in;
	349	};
	350
	351	/* MDIO bus. */
	352	struct qemu_mdio mdio_bus;
	353	unsigned int phyaddr;
	354	int duplex_mismatch;
	355
	356	/* PHY. */
	357	struct qemu_phy phy;
	358	} ETRAXFSEthState;
	359
	360	static void eth_validate_duplex(ETRAXFSEthState *eth)
	361	{
	362	struct qemu_phy *phy;
	363	unsigned int phy_duplex;
	364	unsigned int mac_duplex;
	365	int new_mm = 0;
	366
	367	phy = eth->mdio_bus.devs[eth->phyaddr];
	368	phy_duplex = !!(phy->read(phy, 18) & (1 << 11));
	369	mac_duplex = !!(eth->regs[RW_REC_CTRL] & 128);
	370
	371	if (mac_duplex != phy_duplex) {
	372	new_mm = 1;
	373	}
	374
	375	if (eth->regs[RW_GEN_CTRL] & 1) {
	376	if (new_mm != eth->duplex_mismatch) {
	377	if (new_mm) {
	378	printf("HW: WARNING ETH duplex mismatch MAC=%d PHY=%d\n",
	379	mac_duplex, phy_duplex);
	380	} else {
	381	printf("HW: ETH duplex ok.\n");
	382	}
	383	}
	384	eth->duplex_mismatch = new_mm;
	385	}
	386	}
	387
	388	static uint64_t
	389	eth_read(void *opaque, hwaddr addr, unsigned int size)
	390	{
	391	ETRAXFSEthState *eth = opaque;
	392	uint32_t r = 0;
	393
	394	addr >>= 2;
	395
	396	switch (addr) {
	397	case R_STAT:
	398	r = eth->mdio_bus.mdio & 1;
	399	break;
	400	default:
	401	r = eth->regs[addr];
	402	D(printf("%s %x\n", __func__, addr * 4));
	403	break;
	404	}
	405	return r;
	406	}
	407
	408	static void eth_update_ma(ETRAXFSEthState *eth, int ma)
	409	{
	410	int reg;
	411	int i = 0;
	412
	413	ma &= 1;
	414
	415	reg = RW_MA0_LO;
	416	if (ma) {
	417	reg = RW_MA1_LO;
	418	}
	419
	420	eth->macaddr[ma][i++] = eth->regs[reg];
	421	eth->macaddr[ma][i++] = eth->regs[reg] >> 8;
	422	eth->macaddr[ma][i++] = eth->regs[reg] >> 16;
	423	eth->macaddr[ma][i++] = eth->regs[reg] >> 24;
	424	eth->macaddr[ma][i++] = eth->regs[reg + 1];
	425	eth->macaddr[ma][i] = eth->regs[reg + 1] >> 8;
	426
	427	D(printf("set mac%d=%x.%x.%x.%x.%x.%x\n", ma,
	428	eth->macaddr[ma][0], eth->macaddr[ma][1],
	429	eth->macaddr[ma][2], eth->macaddr[ma][3],
	430	eth->macaddr[ma][4], eth->macaddr[ma][5]));
	431	}
	432
	433	static void
	434	eth_write(void *opaque, hwaddr addr,
	435	uint64_t val64, unsigned int size)
	436	{
	437	ETRAXFSEthState *eth = opaque;
	438	uint32_t value = val64;
	439
	440	addr >>= 2;
	441	switch (addr) {
	442	case RW_MA0_LO:
	443	case RW_MA0_HI:
	444	eth->regs[addr] = value;
	445	eth_update_ma(eth, 0);
	446	break;
	447	case RW_MA1_LO:
	448	case RW_MA1_HI:
	449	eth->regs[addr] = value;
	450	eth_update_ma(eth, 1);
	451	break;
	452
	453	case RW_MGM_CTRL:
	454	/* Attach an MDIO/PHY abstraction. */
	455	if (value & 2) {
	456	eth->mdio_bus.mdio = value & 1;
	457	}
	458	if (eth->mdio_bus.mdc != (value & 4)) {
	459	mdio_cycle(&eth->mdio_bus);
	460	eth_validate_duplex(eth);
	461	}
	462	eth->mdio_bus.mdc = !!(value & 4);
	463	eth->regs[addr] = value;
	464	break;
	465
	466	case RW_REC_CTRL:
	467	eth->regs[addr] = value;
	468	eth_validate_duplex(eth);
	469	break;
	470
	471	default:
	472	eth->regs[addr] = value;
	473	D(printf("%s %x %x\n", __func__, addr, value));
	474	break;
	475	}
	476	}
	477
	478	/* The ETRAX FS has a groupt address table (GAT) which works like a k=1 bloom
	479	filter dropping group addresses we have not joined. The filter has 64
	480	bits (m). The has function is a simple nible xor of the group addr. */
	481	static int eth_match_groupaddr(ETRAXFSEthState eth, const unsigned char sa)
	482	{
	483	unsigned int hsh;
	484	int m_individual = eth->regs[RW_REC_CTRL] & 4;
	485	int match;
	486
	487	/* First bit on the wire of a MAC address signals multicast or
	488	physical address. */
	489	if (!m_individual && !(sa[0] & 1)) {
	490	return 0;
	491	}
	492
	493	/* Calculate the hash index for the GA registers. */
	494	hsh = 0;
	495	hsh ^= (*sa) & 0x3f;
	496	hsh ^= ((*sa) >> 6) & 0x03;
	497	++sa;
	498	hsh ^= ((*sa) << 2) & 0x03c;
	499	hsh ^= ((*sa) >> 4) & 0xf;
	500	++sa;
	501	hsh ^= ((*sa) << 4) & 0x30;
	502	hsh ^= ((*sa) >> 2) & 0x3f;
	503	++sa;
	504	hsh ^= (*sa) & 0x3f;
	505	hsh ^= ((*sa) >> 6) & 0x03;
	506	++sa;
	507	hsh ^= ((*sa) << 2) & 0x03c;
	508	hsh ^= ((*sa) >> 4) & 0xf;
	509	++sa;
	510	hsh ^= ((*sa) << 4) & 0x30;
	511	hsh ^= ((*sa) >> 2) & 0x3f;
	512
	513	hsh &= 63;
	514	if (hsh > 31) {
	515	match = eth->regs[RW_GA_HI] & (1 << (hsh - 32));
	516	} else {
	517	match = eth->regs[RW_GA_LO] & (1 << hsh);
	518	}
	519	D(printf("hsh=%x ga=%x.%x mtch=%d\n", hsh,
	520	eth->regs[RW_GA_HI], eth->regs[RW_GA_LO], match));
	521	return match;
	522	}
	523
	524	static ssize_t eth_receive(NetClientState nc, const uint8_t buf, size_t size)
	525	{
	526	unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
	527	ETRAXFSEthState *eth = qemu_get_nic_opaque(nc);
	528	int use_ma0 = eth->regs[RW_REC_CTRL] & 1;
	529	int use_ma1 = eth->regs[RW_REC_CTRL] & 2;
	530	int r_bcast = eth->regs[RW_REC_CTRL] & 8;
	531
	532	if (size < 12) {
	533	return -1;
	534	}
	535
	536	D(printf("%x.%x.%x.%x.%x.%x ma=%d %d bc=%d\n",
	537	buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
	538	use_ma0, use_ma1, r_bcast));
	539
	540	/* Does the frame get through the address filters? */
	541	if ((!use_ma0 \|\| memcmp(buf, eth->macaddr[0], 6))
	542	&& (!use_ma1 \|\| memcmp(buf, eth->macaddr[1], 6))
	543	&& (!r_bcast \|\| memcmp(buf, sa_bcast, 6))
	544	&& !eth_match_groupaddr(eth, buf)) {
	545	return size;
	546	}
	547
	548	/* FIXME: Find another way to pass on the fake csum. */
	549	etraxfs_dmac_input(eth->dma_in, (void *)buf, size + 4, 1);
	550
	551	return size;
	552	}
	553
	554	static int eth_tx_push(void opaque, unsigned char buf, int len, bool eop)
	555	{
	556	ETRAXFSEthState *eth = opaque;
	557
	558	D(printf("%s buf=%p len=%d\n", __func__, buf, len));
	559	qemu_send_packet(qemu_get_queue(eth->nic), buf, len);
	560	return len;
	561	}
	562
	563	static void eth_set_link(NetClientState *nc)
	564	{
	565	ETRAXFSEthState *eth = qemu_get_nic_opaque(nc);
	566	D(printf("%s %d\n", __func__, nc->link_down));
	567	eth->phy.link = !nc->link_down;
	568	}
	569
	570	static const MemoryRegionOps eth_ops = {
	571	.read = eth_read,
	572	.write = eth_write,
	573	.endianness = DEVICE_LITTLE_ENDIAN,
	574	.valid = {
	575	.min_access_size = 4,
	576	.max_access_size = 4
	577	}
	578	};
	579
	580	static NetClientInfo net_etraxfs_info = {
	581	.type = NET_CLIENT_DRIVER_NIC,
	582	.size = sizeof(NICState),
	583	.receive = eth_receive,
	584	.link_status_changed = eth_set_link,
	585	};
	586
	587	static int fs_eth_init(SysBusDevice *sbd)
	588	{
	589	DeviceState *dev = DEVICE(sbd);
	590	ETRAXFSEthState *s = ETRAX_FS_ETH(dev);
	591
	592	if (!s->dma_out \|\| !s->dma_in) {
	593	error_report("Unconnected ETRAX-FS Ethernet MAC");
	594	return -1;
	595	}
	596
	597	s->dma_out->client.push = eth_tx_push;
	598	s->dma_out->client.opaque = s;
	599	s->dma_in->client.opaque = s;
	600	s->dma_in->client.pull = NULL;
	601
	602	memory_region_init_io(&s->mmio, OBJECT(dev), &eth_ops, s,
	603	"etraxfs-eth", 0x5c);
	604	sysbus_init_mmio(sbd, &s->mmio);
	605
	606	qemu_macaddr_default_if_unset(&s->conf.macaddr);
	607	s->nic = qemu_new_nic(&net_etraxfs_info, &s->conf,
	608	object_get_typename(OBJECT(s)), dev->id, s);
	609	qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
	610
	611
	612	tdk_init(&s->phy);
	613	mdio_attach(&s->mdio_bus, &s->phy, s->phyaddr);
	614	return 0;
	615	}
	616
	617	static Property etraxfs_eth_properties[] = {
	618	DEFINE_PROP_UINT32("phyaddr", ETRAXFSEthState, phyaddr, 1),
	619	DEFINE_PROP_PTR("dma_out", ETRAXFSEthState, vdma_out),
	620	DEFINE_PROP_PTR("dma_in", ETRAXFSEthState, vdma_in),
	621	DEFINE_NIC_PROPERTIES(ETRAXFSEthState, conf),
	622	DEFINE_PROP_END_OF_LIST(),
	623	};
	624
	625	static void etraxfs_eth_class_init(ObjectClass klass, void data)
	626	{
	627	DeviceClass *dc = DEVICE_CLASS(klass);
	628	SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
	629
	630	k->init = fs_eth_init;
	631	dc->props = etraxfs_eth_properties;
	632	/* Reason: pointer properties "dma_out", "dma_in" */
	633	dc->user_creatable = false;
	634	}
	635
	636	static const TypeInfo etraxfs_eth_info = {
	637	.name = TYPE_ETRAX_FS_ETH,
	638	.parent = TYPE_SYS_BUS_DEVICE,
	639	.instance_size = sizeof(ETRAXFSEthState),
	640	.class_init = etraxfs_eth_class_init,
	641	};
	642
	643	static void etraxfs_eth_register_types(void)
	644	{
	645	type_register_static(&etraxfs_eth_info);
	646	}
	647
	648	type_init(etraxfs_eth_register_types)