cadence_gem.c 39.4 KB
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/*
 * QEMU Xilinx GEM emulation
 *
 * Copyright (c) 2011 Xilinx, Inc.
 *
 * 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 <zlib.h> /* For crc32 */

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#include "hw/sysbus.h"
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#include "net/net.h"
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#include "net/checksum.h"

#ifdef CADENCE_GEM_ERR_DEBUG
#define DB_PRINT(...) do { \
    fprintf(stderr,  ": %s: ", __func__); \
    fprintf(stderr, ## __VA_ARGS__); \
    } while (0);
#else
    #define DB_PRINT(...)
#endif

#define GEM_NWCTRL        (0x00000000/4) /* Network Control reg */
#define GEM_NWCFG         (0x00000004/4) /* Network Config reg */
#define GEM_NWSTATUS      (0x00000008/4) /* Network Status reg */
#define GEM_USERIO        (0x0000000C/4) /* User IO reg */
#define GEM_DMACFG        (0x00000010/4) /* DMA Control reg */
#define GEM_TXSTATUS      (0x00000014/4) /* TX Status reg */
#define GEM_RXQBASE       (0x00000018/4) /* RX Q Base address reg */
#define GEM_TXQBASE       (0x0000001C/4) /* TX Q Base address reg */
#define GEM_RXSTATUS      (0x00000020/4) /* RX Status reg */
#define GEM_ISR           (0x00000024/4) /* Interrupt Status reg */
#define GEM_IER           (0x00000028/4) /* Interrupt Enable reg */
#define GEM_IDR           (0x0000002C/4) /* Interrupt Disable reg */
#define GEM_IMR           (0x00000030/4) /* Interrupt Mask reg */
#define GEM_PHYMNTNC      (0x00000034/4) /* Phy Maintaince reg */
#define GEM_RXPAUSE       (0x00000038/4) /* RX Pause Time reg */
#define GEM_TXPAUSE       (0x0000003C/4) /* TX Pause Time reg */
#define GEM_TXPARTIALSF   (0x00000040/4) /* TX Partial Store and Forward */
#define GEM_RXPARTIALSF   (0x00000044/4) /* RX Partial Store and Forward */
#define GEM_HASHLO        (0x00000080/4) /* Hash Low address reg */
#define GEM_HASHHI        (0x00000084/4) /* Hash High address reg */
#define GEM_SPADDR1LO     (0x00000088/4) /* Specific addr 1 low reg */
#define GEM_SPADDR1HI     (0x0000008C/4) /* Specific addr 1 high reg */
#define GEM_SPADDR2LO     (0x00000090/4) /* Specific addr 2 low reg */
#define GEM_SPADDR2HI     (0x00000094/4) /* Specific addr 2 high reg */
#define GEM_SPADDR3LO     (0x00000098/4) /* Specific addr 3 low reg */
#define GEM_SPADDR3HI     (0x0000009C/4) /* Specific addr 3 high reg */
#define GEM_SPADDR4LO     (0x000000A0/4) /* Specific addr 4 low reg */
#define GEM_SPADDR4HI     (0x000000A4/4) /* Specific addr 4 high reg */
#define GEM_TIDMATCH1     (0x000000A8/4) /* Type ID1 Match reg */
#define GEM_TIDMATCH2     (0x000000AC/4) /* Type ID2 Match reg */
#define GEM_TIDMATCH3     (0x000000B0/4) /* Type ID3 Match reg */
#define GEM_TIDMATCH4     (0x000000B4/4) /* Type ID4 Match reg */
#define GEM_WOLAN         (0x000000B8/4) /* Wake on LAN reg */
#define GEM_IPGSTRETCH    (0x000000BC/4) /* IPG Stretch reg */
#define GEM_SVLAN         (0x000000C0/4) /* Stacked VLAN reg */
#define GEM_MODID         (0x000000FC/4) /* Module ID reg */
#define GEM_OCTTXLO       (0x00000100/4) /* Octects transmitted Low reg */
#define GEM_OCTTXHI       (0x00000104/4) /* Octects transmitted High reg */
#define GEM_TXCNT         (0x00000108/4) /* Error-free Frames transmitted */
#define GEM_TXBCNT        (0x0000010C/4) /* Error-free Broadcast Frames */
#define GEM_TXMCNT        (0x00000110/4) /* Error-free Multicast Frame */
#define GEM_TXPAUSECNT    (0x00000114/4) /* Pause Frames Transmitted */
#define GEM_TX64CNT       (0x00000118/4) /* Error-free 64 TX */
#define GEM_TX65CNT       (0x0000011C/4) /* Error-free 65-127 TX */
#define GEM_TX128CNT      (0x00000120/4) /* Error-free 128-255 TX */
#define GEM_TX256CNT      (0x00000124/4) /* Error-free 256-511 */
#define GEM_TX512CNT      (0x00000128/4) /* Error-free 512-1023 TX */
#define GEM_TX1024CNT     (0x0000012C/4) /* Error-free 1024-1518 TX */
#define GEM_TX1519CNT     (0x00000130/4) /* Error-free larger than 1519 TX */
#define GEM_TXURUNCNT     (0x00000134/4) /* TX under run error counter */
#define GEM_SINGLECOLLCNT (0x00000138/4) /* Single Collision Frames */
#define GEM_MULTCOLLCNT   (0x0000013C/4) /* Multiple Collision Frames */
#define GEM_EXCESSCOLLCNT (0x00000140/4) /* Excessive Collision Frames */
#define GEM_LATECOLLCNT   (0x00000144/4) /* Late Collision Frames */
#define GEM_DEFERTXCNT    (0x00000148/4) /* Deferred Transmission Frames */
#define GEM_CSENSECNT     (0x0000014C/4) /* Carrier Sense Error Counter */
#define GEM_OCTRXLO       (0x00000150/4) /* Octects Received register Low */
#define GEM_OCTRXHI       (0x00000154/4) /* Octects Received register High */
#define GEM_RXCNT         (0x00000158/4) /* Error-free Frames Received */
#define GEM_RXBROADCNT    (0x0000015C/4) /* Error-free Broadcast Frames RX */
#define GEM_RXMULTICNT    (0x00000160/4) /* Error-free Multicast Frames RX */
#define GEM_RXPAUSECNT    (0x00000164/4) /* Pause Frames Received Counter */
#define GEM_RX64CNT       (0x00000168/4) /* Error-free 64 byte Frames RX */
#define GEM_RX65CNT       (0x0000016C/4) /* Error-free 65-127B Frames RX */
#define GEM_RX128CNT      (0x00000170/4) /* Error-free 128-255B Frames RX */
#define GEM_RX256CNT      (0x00000174/4) /* Error-free 256-512B Frames RX */
#define GEM_RX512CNT      (0x00000178/4) /* Error-free 512-1023B Frames RX */
#define GEM_RX1024CNT     (0x0000017C/4) /* Error-free 1024-1518B Frames RX */
#define GEM_RX1519CNT     (0x00000180/4) /* Error-free 1519-max Frames RX */
#define GEM_RXUNDERCNT    (0x00000184/4) /* Undersize Frames Received */
#define GEM_RXOVERCNT     (0x00000188/4) /* Oversize Frames Received */
#define GEM_RXJABCNT      (0x0000018C/4) /* Jabbers Received Counter */
#define GEM_RXFCSCNT      (0x00000190/4) /* Frame Check seq. Error Counter */
#define GEM_RXLENERRCNT   (0x00000194/4) /* Length Field Error Counter */
#define GEM_RXSYMERRCNT   (0x00000198/4) /* Symbol Error Counter */
#define GEM_RXALIGNERRCNT (0x0000019C/4) /* Alignment Error Counter */
#define GEM_RXRSCERRCNT   (0x000001A0/4) /* Receive Resource Error Counter */
#define GEM_RXORUNCNT     (0x000001A4/4) /* Receive Overrun Counter */
#define GEM_RXIPCSERRCNT  (0x000001A8/4) /* IP header Checksum Error Counter */
#define GEM_RXTCPCCNT     (0x000001AC/4) /* TCP Checksum Error Counter */
#define GEM_RXUDPCCNT     (0x000001B0/4) /* UDP Checksum Error Counter */

#define GEM_1588S         (0x000001D0/4) /* 1588 Timer Seconds */
#define GEM_1588NS        (0x000001D4/4) /* 1588 Timer Nanoseconds */
#define GEM_1588ADJ       (0x000001D8/4) /* 1588 Timer Adjust */
#define GEM_1588INC       (0x000001DC/4) /* 1588 Timer Increment */
#define GEM_PTPETXS       (0x000001E0/4) /* PTP Event Frame Transmitted (s) */
#define GEM_PTPETXNS      (0x000001E4/4) /* PTP Event Frame Transmitted (ns) */
#define GEM_PTPERXS       (0x000001E8/4) /* PTP Event Frame Received (s) */
#define GEM_PTPERXNS      (0x000001EC/4) /* PTP Event Frame Received (ns) */
#define GEM_PTPPTXS       (0x000001E0/4) /* PTP Peer Frame Transmitted (s) */
#define GEM_PTPPTXNS      (0x000001E4/4) /* PTP Peer Frame Transmitted (ns) */
#define GEM_PTPPRXS       (0x000001E8/4) /* PTP Peer Frame Received (s) */
#define GEM_PTPPRXNS      (0x000001EC/4) /* PTP Peer Frame Received (ns) */

/* Design Configuration Registers */
#define GEM_DESCONF       (0x00000280/4)
#define GEM_DESCONF2      (0x00000284/4)
#define GEM_DESCONF3      (0x00000288/4)
#define GEM_DESCONF4      (0x0000028C/4)
#define GEM_DESCONF5      (0x00000290/4)
#define GEM_DESCONF6      (0x00000294/4)
#define GEM_DESCONF7      (0x00000298/4)

#define GEM_MAXREG        (0x00000640/4) /* Last valid GEM address */

/*****************************************/
#define GEM_NWCTRL_TXSTART     0x00000200 /* Transmit Enable */
#define GEM_NWCTRL_TXENA       0x00000008 /* Transmit Enable */
#define GEM_NWCTRL_RXENA       0x00000004 /* Receive Enable */
#define GEM_NWCTRL_LOCALLOOP   0x00000002 /* Local Loopback */

#define GEM_NWCFG_STRIP_FCS    0x00020000 /* Strip FCS field */
#define GEM_NWCFG_LERR_DISC    0x00010000 /* Discard RX frames with lenth err */
#define GEM_NWCFG_BUFF_OFST_M  0x0000C000 /* Receive buffer offset mask */
#define GEM_NWCFG_BUFF_OFST_S  14         /* Receive buffer offset shift */
#define GEM_NWCFG_UCAST_HASH   0x00000080 /* accept unicast if hash match */
#define GEM_NWCFG_MCAST_HASH   0x00000040 /* accept multicast if hash match */
#define GEM_NWCFG_BCAST_REJ    0x00000020 /* Reject broadcast packets */
#define GEM_NWCFG_PROMISC      0x00000010 /* Accept all packets */

#define GEM_DMACFG_RBUFSZ_M    0x007F0000 /* DMA RX Buffer Size mask */
#define GEM_DMACFG_RBUFSZ_S    16         /* DMA RX Buffer Size shift */
#define GEM_DMACFG_RBUFSZ_MUL  64         /* DMA RX Buffer Size multiplier */
#define GEM_DMACFG_TXCSUM_OFFL 0x00000800 /* Transmit checksum offload */

#define GEM_TXSTATUS_TXCMPL    0x00000020 /* Transmit Complete */
#define GEM_TXSTATUS_USED      0x00000001 /* sw owned descriptor encountered */

#define GEM_RXSTATUS_FRMRCVD   0x00000002 /* Frame received */
#define GEM_RXSTATUS_NOBUF     0x00000001 /* Buffer unavailable */

/* GEM_ISR GEM_IER GEM_IDR GEM_IMR */
#define GEM_INT_TXCMPL        0x00000080 /* Transmit Complete */
#define GEM_INT_TXUSED         0x00000008
#define GEM_INT_RXUSED         0x00000004
#define GEM_INT_RXCMPL        0x00000002

#define GEM_PHYMNTNC_OP_R      0x20000000 /* read operation */
#define GEM_PHYMNTNC_OP_W      0x10000000 /* write operation */
#define GEM_PHYMNTNC_ADDR      0x0F800000 /* Address bits */
#define GEM_PHYMNTNC_ADDR_SHFT 23
#define GEM_PHYMNTNC_REG       0x007C0000 /* register bits */
#define GEM_PHYMNTNC_REG_SHIFT 18

/* Marvell PHY definitions */
#define BOARD_PHY_ADDRESS    23 /* PHY address we will emulate a device at */

#define PHY_REG_CONTROL      0
#define PHY_REG_STATUS       1
#define PHY_REG_PHYID1       2
#define PHY_REG_PHYID2       3
#define PHY_REG_ANEGADV      4
#define PHY_REG_LINKPABIL    5
#define PHY_REG_ANEGEXP      6
#define PHY_REG_NEXTP        7
#define PHY_REG_LINKPNEXTP   8
#define PHY_REG_100BTCTRL    9
#define PHY_REG_1000BTSTAT   10
#define PHY_REG_EXTSTAT      15
#define PHY_REG_PHYSPCFC_CTL 16
#define PHY_REG_PHYSPCFC_ST  17
#define PHY_REG_INT_EN       18
#define PHY_REG_INT_ST       19
#define PHY_REG_EXT_PHYSPCFC_CTL  20
#define PHY_REG_RXERR        21
#define PHY_REG_EACD         22
#define PHY_REG_LED          24
#define PHY_REG_LED_OVRD     25
#define PHY_REG_EXT_PHYSPCFC_CTL2 26
#define PHY_REG_EXT_PHYSPCFC_ST   27
#define PHY_REG_CABLE_DIAG   28

#define PHY_REG_CONTROL_RST  0x8000
#define PHY_REG_CONTROL_LOOP 0x4000
#define PHY_REG_CONTROL_ANEG 0x1000

#define PHY_REG_STATUS_LINK     0x0004
#define PHY_REG_STATUS_ANEGCMPL 0x0020

#define PHY_REG_INT_ST_ANEGCMPL 0x0800
#define PHY_REG_INT_ST_LINKC    0x0400
#define PHY_REG_INT_ST_ENERGY   0x0010

/***********************************************************************/
#define GEM_RX_REJECT  1
#define GEM_RX_ACCEPT  0

/***********************************************************************/

#define DESC_1_USED 0x80000000
#define DESC_1_LENGTH 0x00001FFF

#define DESC_1_TX_WRAP 0x40000000
#define DESC_1_TX_LAST 0x00008000

#define DESC_0_RX_WRAP 0x00000002
#define DESC_0_RX_OWNERSHIP 0x00000001

#define DESC_1_RX_SOF 0x00004000
#define DESC_1_RX_EOF 0x00008000

static inline unsigned tx_desc_get_buffer(unsigned *desc)
{
    return desc[0];
}

static inline unsigned tx_desc_get_used(unsigned *desc)
{
    return (desc[1] & DESC_1_USED) ? 1 : 0;
}

static inline void tx_desc_set_used(unsigned *desc)
{
    desc[1] |= DESC_1_USED;
}

static inline unsigned tx_desc_get_wrap(unsigned *desc)
{
    return (desc[1] & DESC_1_TX_WRAP) ? 1 : 0;
}

static inline unsigned tx_desc_get_last(unsigned *desc)
{
    return (desc[1] & DESC_1_TX_LAST) ? 1 : 0;
}

static inline unsigned tx_desc_get_length(unsigned *desc)
{
    return desc[1] & DESC_1_LENGTH;
}

static inline void print_gem_tx_desc(unsigned *desc)
{
    DB_PRINT("TXDESC:\n");
    DB_PRINT("bufaddr: 0x%08x\n", *desc);
    DB_PRINT("used_hw: %d\n", tx_desc_get_used(desc));
    DB_PRINT("wrap:    %d\n", tx_desc_get_wrap(desc));
    DB_PRINT("last:    %d\n", tx_desc_get_last(desc));
    DB_PRINT("length:  %d\n", tx_desc_get_length(desc));
}

static inline unsigned rx_desc_get_buffer(unsigned *desc)
{
    return desc[0] & ~0x3UL;
}

static inline unsigned rx_desc_get_wrap(unsigned *desc)
{
    return desc[0] & DESC_0_RX_WRAP ? 1 : 0;
}

static inline unsigned rx_desc_get_ownership(unsigned *desc)
{
    return desc[0] & DESC_0_RX_OWNERSHIP ? 1 : 0;
}

static inline void rx_desc_set_ownership(unsigned *desc)
{
    desc[0] |= DESC_0_RX_OWNERSHIP;
}

static inline void rx_desc_set_sof(unsigned *desc)
{
    desc[1] |= DESC_1_RX_SOF;
}

static inline void rx_desc_set_eof(unsigned *desc)
{
    desc[1] |= DESC_1_RX_EOF;
}

static inline void rx_desc_set_length(unsigned *desc, unsigned len)
{
    desc[1] &= ~DESC_1_LENGTH;
    desc[1] |= len;
}

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#define TYPE_CADENCE_GEM "cadence_gem"
#define GEM(obj) OBJECT_CHECK(GemState, (obj), TYPE_CADENCE_GEM)

typedef struct GemState {
    SysBusDevice parent_obj;

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    MemoryRegion iomem;
    NICState *nic;
    NICConf conf;
    qemu_irq irq;

    /* GEM registers backing store */
    uint32_t regs[GEM_MAXREG];
    /* Mask of register bits which are write only */
    uint32_t regs_wo[GEM_MAXREG];
    /* Mask of register bits which are read only */
    uint32_t regs_ro[GEM_MAXREG];
    /* Mask of register bits which are clear on read */
    uint32_t regs_rtc[GEM_MAXREG];
    /* Mask of register bits which are write 1 to clear */
    uint32_t regs_w1c[GEM_MAXREG];

    /* PHY registers backing store */
    uint16_t phy_regs[32];

    uint8_t phy_loop; /* Are we in phy loopback? */

    /* The current DMA descriptor pointers */
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    uint32_t rx_desc_addr;
    uint32_t tx_desc_addr;
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} GemState;

/* The broadcast MAC address: 0xFFFFFFFFFFFF */
const uint8_t broadcast_addr[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };

/*
 * gem_init_register_masks:
 * One time initialization.
 * Set masks to identify which register bits have magical clear properties
 */
static void gem_init_register_masks(GemState *s)
{
    /* Mask of register bits which are read only*/
    memset(&s->regs_ro[0], 0, sizeof(s->regs_ro));
    s->regs_ro[GEM_NWCTRL]   = 0xFFF80000;
    s->regs_ro[GEM_NWSTATUS] = 0xFFFFFFFF;
    s->regs_ro[GEM_DMACFG]   = 0xFE00F000;
    s->regs_ro[GEM_TXSTATUS] = 0xFFFFFE08;
    s->regs_ro[GEM_RXQBASE]  = 0x00000003;
    s->regs_ro[GEM_TXQBASE]  = 0x00000003;
    s->regs_ro[GEM_RXSTATUS] = 0xFFFFFFF0;
    s->regs_ro[GEM_ISR]      = 0xFFFFFFFF;
    s->regs_ro[GEM_IMR]      = 0xFFFFFFFF;
    s->regs_ro[GEM_MODID]    = 0xFFFFFFFF;

    /* Mask of register bits which are clear on read */
    memset(&s->regs_rtc[0], 0, sizeof(s->regs_rtc));
    s->regs_rtc[GEM_ISR]      = 0xFFFFFFFF;

    /* Mask of register bits which are write 1 to clear */
    memset(&s->regs_w1c[0], 0, sizeof(s->regs_w1c));
    s->regs_w1c[GEM_TXSTATUS] = 0x000001F7;
    s->regs_w1c[GEM_RXSTATUS] = 0x0000000F;

    /* Mask of register bits which are write only */
    memset(&s->regs_wo[0], 0, sizeof(s->regs_wo));
    s->regs_wo[GEM_NWCTRL]   = 0x00073E60;
    s->regs_wo[GEM_IER]      = 0x07FFFFFF;
    s->regs_wo[GEM_IDR]      = 0x07FFFFFF;
}

/*
 * phy_update_link:
 * Make the emulated PHY link state match the QEMU "interface" state.
 */
static void phy_update_link(GemState *s)
{
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    DB_PRINT("down %d\n", qemu_get_queue(s->nic)->link_down);
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    /* Autonegotiation status mirrors link status.  */
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    if (qemu_get_queue(s->nic)->link_down) {
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        s->phy_regs[PHY_REG_STATUS] &= ~(PHY_REG_STATUS_ANEGCMPL |
                                         PHY_REG_STATUS_LINK);
        s->phy_regs[PHY_REG_INT_ST] |= PHY_REG_INT_ST_LINKC;
    } else {
        s->phy_regs[PHY_REG_STATUS] |= (PHY_REG_STATUS_ANEGCMPL |
                                         PHY_REG_STATUS_LINK);
        s->phy_regs[PHY_REG_INT_ST] |= (PHY_REG_INT_ST_LINKC |
                                        PHY_REG_INT_ST_ANEGCMPL |
                                        PHY_REG_INT_ST_ENERGY);
    }
}

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static int gem_can_receive(NetClientState *nc)
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{
    GemState *s;

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    s = qemu_get_nic_opaque(nc);
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    DB_PRINT("\n");

    /* Do nothing if receive is not enabled. */
    if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_RXENA)) {
        return 0;
    }

    return 1;
}

/*
 * gem_update_int_status:
 * Raise or lower interrupt based on current status.
 */
static void gem_update_int_status(GemState *s)
{
    if (s->regs[GEM_ISR]) {
        DB_PRINT("asserting int. (0x%08x)\n", s->regs[GEM_ISR]);
        qemu_set_irq(s->irq, 1);
    }
}

/*
 * gem_receive_updatestats:
 * Increment receive statistics.
 */
static void gem_receive_updatestats(GemState *s, const uint8_t *packet,
                                    unsigned bytes)
{
    uint64_t octets;

    /* Total octets (bytes) received */
    octets = ((uint64_t)(s->regs[GEM_OCTRXLO]) << 32) |
             s->regs[GEM_OCTRXHI];
    octets += bytes;
    s->regs[GEM_OCTRXLO] = octets >> 32;
    s->regs[GEM_OCTRXHI] = octets;

    /* Error-free Frames received */
    s->regs[GEM_RXCNT]++;

    /* Error-free Broadcast Frames counter */
    if (!memcmp(packet, broadcast_addr, 6)) {
        s->regs[GEM_RXBROADCNT]++;
    }

    /* Error-free Multicast Frames counter */
    if (packet[0] == 0x01) {
        s->regs[GEM_RXMULTICNT]++;
    }

    if (bytes <= 64) {
        s->regs[GEM_RX64CNT]++;
    } else if (bytes <= 127) {
        s->regs[GEM_RX65CNT]++;
    } else if (bytes <= 255) {
        s->regs[GEM_RX128CNT]++;
    } else if (bytes <= 511) {
        s->regs[GEM_RX256CNT]++;
    } else if (bytes <= 1023) {
        s->regs[GEM_RX512CNT]++;
    } else if (bytes <= 1518) {
        s->regs[GEM_RX1024CNT]++;
    } else {
        s->regs[GEM_RX1519CNT]++;
    }
}

/*
 * Get the MAC Address bit from the specified position
 */
static unsigned get_bit(const uint8_t *mac, unsigned bit)
{
    unsigned byte;

    byte = mac[bit / 8];
    byte >>= (bit & 0x7);
    byte &= 1;

    return byte;
}

/*
 * Calculate a GEM MAC Address hash index
 */
static unsigned calc_mac_hash(const uint8_t *mac)
{
    int index_bit, mac_bit;
    unsigned hash_index;

    hash_index = 0;
    mac_bit = 5;
    for (index_bit = 5; index_bit >= 0; index_bit--) {
        hash_index |= (get_bit(mac,  mac_bit) ^
                               get_bit(mac, mac_bit + 6) ^
                               get_bit(mac, mac_bit + 12) ^
                               get_bit(mac, mac_bit + 18) ^
                               get_bit(mac, mac_bit + 24) ^
                               get_bit(mac, mac_bit + 30) ^
                               get_bit(mac, mac_bit + 36) ^
                               get_bit(mac, mac_bit + 42)) << index_bit;
        mac_bit--;
    }

    return hash_index;
}

/*
 * gem_mac_address_filter:
 * Accept or reject this destination address?
 * Returns:
 * GEM_RX_REJECT: reject
 * GEM_RX_ACCEPT: accept
 */
static int gem_mac_address_filter(GemState *s, const uint8_t *packet)
{
    uint8_t *gem_spaddr;
    int i;

    /* Promiscuous mode? */
    if (s->regs[GEM_NWCFG] & GEM_NWCFG_PROMISC) {
        return GEM_RX_ACCEPT;
    }

    if (!memcmp(packet, broadcast_addr, 6)) {
        /* Reject broadcast packets? */
        if (s->regs[GEM_NWCFG] & GEM_NWCFG_BCAST_REJ) {
            return GEM_RX_REJECT;
        }
        return GEM_RX_ACCEPT;
    }

    /* Accept packets -w- hash match? */
    if ((packet[0] == 0x01 && (s->regs[GEM_NWCFG] & GEM_NWCFG_MCAST_HASH)) ||
        (packet[0] != 0x01 && (s->regs[GEM_NWCFG] & GEM_NWCFG_UCAST_HASH))) {
        unsigned hash_index;

        hash_index = calc_mac_hash(packet);
        if (hash_index < 32) {
            if (s->regs[GEM_HASHLO] & (1<<hash_index)) {
                return GEM_RX_ACCEPT;
            }
        } else {
            hash_index -= 32;
            if (s->regs[GEM_HASHHI] & (1<<hash_index)) {
                return GEM_RX_ACCEPT;
            }
        }
    }

    /* Check all 4 specific addresses */
    gem_spaddr = (uint8_t *)&(s->regs[GEM_SPADDR1LO]);
    for (i = 0; i < 4; i++) {
        if (!memcmp(packet, gem_spaddr, 6)) {
            return GEM_RX_ACCEPT;
        }

        gem_spaddr += 8;
    }

    /* No address match; reject the packet */
    return GEM_RX_REJECT;
}

/*
 * gem_receive:
 * Fit a packet handed to us by QEMU into the receive descriptor ring.
 */
586
static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size)
587 588
{
    unsigned    desc[2];
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    hwaddr packet_desc_addr, last_desc_addr;
590 591 592 593 594 595
    GemState *s;
    unsigned   rxbufsize, bytes_to_copy;
    unsigned   rxbuf_offset;
    uint8_t    rxbuf[2048];
    uint8_t   *rxbuf_ptr;

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    s = qemu_get_nic_opaque(nc);
597 598

    /* Do nothing if receive is not enabled. */
599
    if (!gem_can_receive(nc)) {
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647
        return -1;
    }

    /* Is this destination MAC address "for us" ? */
    if (gem_mac_address_filter(s, buf) == GEM_RX_REJECT) {
        return -1;
    }

    /* Discard packets with receive length error enabled ? */
    if (s->regs[GEM_NWCFG] & GEM_NWCFG_LERR_DISC) {
        unsigned type_len;

        /* Fish the ethertype / length field out of the RX packet */
        type_len = buf[12] << 8 | buf[13];
        /* It is a length field, not an ethertype */
        if (type_len < 0x600) {
            if (size < type_len) {
                /* discard */
                return -1;
            }
        }
    }

    /*
     * Determine configured receive buffer offset (probably 0)
     */
    rxbuf_offset = (s->regs[GEM_NWCFG] & GEM_NWCFG_BUFF_OFST_M) >>
                   GEM_NWCFG_BUFF_OFST_S;

    /* The configure size of each receive buffer.  Determines how many
     * buffers needed to hold this packet.
     */
    rxbufsize = ((s->regs[GEM_DMACFG] & GEM_DMACFG_RBUFSZ_M) >>
                 GEM_DMACFG_RBUFSZ_S) * GEM_DMACFG_RBUFSZ_MUL;
    bytes_to_copy = size;

    /* Strip of FCS field ? (usually yes) */
    if (s->regs[GEM_NWCFG] & GEM_NWCFG_STRIP_FCS) {
        rxbuf_ptr = (void *)buf;
    } else {
        unsigned crc_val;
        int      crc_offset;

        /* The application wants the FCS field, which QEMU does not provide.
         * We must try and caclculate one.
         */

        memcpy(rxbuf, buf, size);
648
        memset(rxbuf + size, 0, sizeof(rxbuf) - size);
649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670
        rxbuf_ptr = rxbuf;
        crc_val = cpu_to_le32(crc32(0, rxbuf, MAX(size, 60)));
        if (size < 60) {
            crc_offset = 60;
        } else {
            crc_offset = size;
        }
        memcpy(rxbuf + crc_offset, &crc_val, sizeof(crc_val));

        bytes_to_copy += 4;
        size += 4;
    }

    /* Pad to minimum length */
    if (size < 64) {
        size = 64;
    }

    DB_PRINT("config bufsize: %d packet size: %ld\n", rxbufsize, size);

    packet_desc_addr = s->rx_desc_addr;
    while (1) {
671
        DB_PRINT("read descriptor 0x%x\n", (unsigned)packet_desc_addr);
672 673 674 675 676 677
        /* read current descriptor */
        cpu_physical_memory_read(packet_desc_addr,
                                 (uint8_t *)&desc[0], sizeof(desc));

        /* Descriptor owned by software ? */
        if (rx_desc_get_ownership(desc) == 1) {
678 679
            DB_PRINT("descriptor 0x%x owned by sw.\n",
                     (unsigned)packet_desc_addr);
680
            s->regs[GEM_RXSTATUS] |= GEM_RXSTATUS_NOBUF;
681
            s->regs[GEM_ISR] |= GEM_INT_RXUSED & ~(s->regs[GEM_IMR]);
682 683 684 685 686 687 688 689 690 691 692 693 694
            /* Handle interrupt consequences */
            gem_update_int_status(s);
            return -1;
        }

        DB_PRINT("copy %d bytes to 0x%x\n", MIN(bytes_to_copy, rxbufsize),
                rx_desc_get_buffer(desc));

        /*
         * Let's have QEMU lend a helping hand.
         */
        if (rx_desc_get_buffer(desc) == 0) {
            DB_PRINT("Invalid RX buffer (NULL) for descriptor 0x%x\n",
695
                     (unsigned)packet_desc_addr);
696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730
            break;
        }

        /* Copy packet data to emulated DMA buffer */
        cpu_physical_memory_write(rx_desc_get_buffer(desc) + rxbuf_offset,
                                  rxbuf_ptr, MIN(bytes_to_copy, rxbufsize));
        bytes_to_copy -= MIN(bytes_to_copy, rxbufsize);
        rxbuf_ptr += MIN(bytes_to_copy, rxbufsize);
        if (bytes_to_copy == 0) {
            break;
        }

        /* Next descriptor */
        if (rx_desc_get_wrap(desc)) {
            packet_desc_addr = s->regs[GEM_RXQBASE];
        } else {
            packet_desc_addr += 8;
        }
    }

    DB_PRINT("set length: %ld, EOF on descriptor 0x%x\n", size,
            (unsigned)packet_desc_addr);

    /* Update last descriptor with EOF and total length */
    rx_desc_set_eof(desc);
    rx_desc_set_length(desc, size);
    cpu_physical_memory_write(packet_desc_addr,
                              (uint8_t *)&desc[0], sizeof(desc));

    /* Advance RX packet descriptor Q */
    last_desc_addr = packet_desc_addr;
    packet_desc_addr = s->rx_desc_addr;
    s->rx_desc_addr = last_desc_addr;
    if (rx_desc_get_wrap(desc)) {
        s->rx_desc_addr = s->regs[GEM_RXQBASE];
731
        DB_PRINT("wrapping RX descriptor list\n");
732
    } else {
733
        DB_PRINT("incrementing RX descriptor list\n");
734 735 736
        s->rx_desc_addr += 8;
    }

737
    DB_PRINT("set SOF, OWN on descriptor 0x%08x\n", (unsigned)packet_desc_addr);
738 739 740 741 742 743 744 745 746 747 748 749 750 751

    /* Count it */
    gem_receive_updatestats(s, buf, size);

    /* Update first descriptor (which could also be the last) */
    /* read descriptor */
    cpu_physical_memory_read(packet_desc_addr,
                             (uint8_t *)&desc[0], sizeof(desc));
    rx_desc_set_sof(desc);
    rx_desc_set_ownership(desc);
    cpu_physical_memory_write(packet_desc_addr,
                              (uint8_t *)&desc[0], sizeof(desc));

    s->regs[GEM_RXSTATUS] |= GEM_RXSTATUS_FRMRCVD;
752
    s->regs[GEM_ISR] |= GEM_INT_RXCMPL & ~(s->regs[GEM_IMR]);
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812

    /* Handle interrupt consequences */
    gem_update_int_status(s);

    return size;
}

/*
 * gem_transmit_updatestats:
 * Increment transmit statistics.
 */
static void gem_transmit_updatestats(GemState *s, const uint8_t *packet,
                                     unsigned bytes)
{
    uint64_t octets;

    /* Total octets (bytes) transmitted */
    octets = ((uint64_t)(s->regs[GEM_OCTTXLO]) << 32) |
             s->regs[GEM_OCTTXHI];
    octets += bytes;
    s->regs[GEM_OCTTXLO] = octets >> 32;
    s->regs[GEM_OCTTXHI] = octets;

    /* Error-free Frames transmitted */
    s->regs[GEM_TXCNT]++;

    /* Error-free Broadcast Frames counter */
    if (!memcmp(packet, broadcast_addr, 6)) {
        s->regs[GEM_TXBCNT]++;
    }

    /* Error-free Multicast Frames counter */
    if (packet[0] == 0x01) {
        s->regs[GEM_TXMCNT]++;
    }

    if (bytes <= 64) {
        s->regs[GEM_TX64CNT]++;
    } else if (bytes <= 127) {
        s->regs[GEM_TX65CNT]++;
    } else if (bytes <= 255) {
        s->regs[GEM_TX128CNT]++;
    } else if (bytes <= 511) {
        s->regs[GEM_TX256CNT]++;
    } else if (bytes <= 1023) {
        s->regs[GEM_TX512CNT]++;
    } else if (bytes <= 1518) {
        s->regs[GEM_TX1024CNT]++;
    } else {
        s->regs[GEM_TX1519CNT]++;
    }
}

/*
 * gem_transmit:
 * Fish packets out of the descriptor ring and feed them to QEMU
 */
static void gem_transmit(GemState *s)
{
    unsigned    desc[2];
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    hwaddr packet_desc_addr;
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849
    uint8_t     tx_packet[2048];
    uint8_t     *p;
    unsigned    total_bytes;

    /* Do nothing if transmit is not enabled. */
    if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_TXENA)) {
        return;
    }

    DB_PRINT("\n");

    /* The packet we will hand off to qemu.
     * Packets scattered across multiple descriptors are gathered to this
     * one contiguous buffer first.
     */
    p = tx_packet;
    total_bytes = 0;

    /* read current descriptor */
    packet_desc_addr = s->tx_desc_addr;
    cpu_physical_memory_read(packet_desc_addr,
                             (uint8_t *)&desc[0], sizeof(desc));
    /* Handle all descriptors owned by hardware */
    while (tx_desc_get_used(desc) == 0) {

        /* Do nothing if transmit is not enabled. */
        if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_TXENA)) {
            return;
        }
        print_gem_tx_desc(desc);

        /* The real hardware would eat this (and possibly crash).
         * For QEMU let's lend a helping hand.
         */
        if ((tx_desc_get_buffer(desc) == 0) ||
            (tx_desc_get_length(desc) == 0)) {
850 851
            DB_PRINT("Invalid TX descriptor @ 0x%x\n",
                     (unsigned)packet_desc_addr);
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881
            break;
        }

        /* Gather this fragment of the packet from "dma memory" to our contig.
         * buffer.
         */
        cpu_physical_memory_read(tx_desc_get_buffer(desc), p,
                                 tx_desc_get_length(desc));
        p += tx_desc_get_length(desc);
        total_bytes += tx_desc_get_length(desc);

        /* Last descriptor for this packet; hand the whole thing off */
        if (tx_desc_get_last(desc)) {
            /* Modify the 1st descriptor of this packet to be owned by
             * the processor.
             */
            cpu_physical_memory_read(s->tx_desc_addr,
                                     (uint8_t *)&desc[0], sizeof(desc));
            tx_desc_set_used(desc);
            cpu_physical_memory_write(s->tx_desc_addr,
                                      (uint8_t *)&desc[0], sizeof(desc));
            /* Advance the hardare current descriptor past this packet */
            if (tx_desc_get_wrap(desc)) {
                s->tx_desc_addr = s->regs[GEM_TXQBASE];
            } else {
                s->tx_desc_addr = packet_desc_addr + 8;
            }
            DB_PRINT("TX descriptor next: 0x%08x\n", s->tx_desc_addr);

            s->regs[GEM_TXSTATUS] |= GEM_TXSTATUS_TXCMPL;
882
            s->regs[GEM_ISR] |= GEM_INT_TXCMPL & ~(s->regs[GEM_IMR]);
883 884 885 886 887 888 889 890 891 892 893 894 895 896

            /* Handle interrupt consequences */
            gem_update_int_status(s);

            /* Is checksum offload enabled? */
            if (s->regs[GEM_DMACFG] & GEM_DMACFG_TXCSUM_OFFL) {
                net_checksum_calculate(tx_packet, total_bytes);
            }

            /* Update MAC statistics */
            gem_transmit_updatestats(s, tx_packet, total_bytes);

            /* Send the packet somewhere */
            if (s->phy_loop) {
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                gem_receive(qemu_get_queue(s->nic), tx_packet, total_bytes);
898
            } else {
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899 900
                qemu_send_packet(qemu_get_queue(s->nic), tx_packet,
                                 total_bytes);
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
            }

            /* Prepare for next packet */
            p = tx_packet;
            total_bytes = 0;
        }

        /* read next descriptor */
        if (tx_desc_get_wrap(desc)) {
            packet_desc_addr = s->regs[GEM_TXQBASE];
        } else {
            packet_desc_addr += 8;
        }
        cpu_physical_memory_read(packet_desc_addr,
                                 (uint8_t *)&desc[0], sizeof(desc));
    }

    if (tx_desc_get_used(desc)) {
        s->regs[GEM_TXSTATUS] |= GEM_TXSTATUS_USED;
920
        s->regs[GEM_ISR] |= GEM_INT_TXUSED & ~(s->regs[GEM_IMR]);
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
        gem_update_int_status(s);
    }
}

static void gem_phy_reset(GemState *s)
{
    memset(&s->phy_regs[0], 0, sizeof(s->phy_regs));
    s->phy_regs[PHY_REG_CONTROL] = 0x1140;
    s->phy_regs[PHY_REG_STATUS] = 0x7969;
    s->phy_regs[PHY_REG_PHYID1] = 0x0141;
    s->phy_regs[PHY_REG_PHYID2] = 0x0CC2;
    s->phy_regs[PHY_REG_ANEGADV] = 0x01E1;
    s->phy_regs[PHY_REG_LINKPABIL] = 0xCDE1;
    s->phy_regs[PHY_REG_ANEGEXP] = 0x000F;
    s->phy_regs[PHY_REG_NEXTP] = 0x2001;
    s->phy_regs[PHY_REG_LINKPNEXTP] = 0x40E6;
    s->phy_regs[PHY_REG_100BTCTRL] = 0x0300;
    s->phy_regs[PHY_REG_1000BTSTAT] = 0x7C00;
    s->phy_regs[PHY_REG_EXTSTAT] = 0x3000;
    s->phy_regs[PHY_REG_PHYSPCFC_CTL] = 0x0078;
    s->phy_regs[PHY_REG_PHYSPCFC_ST] = 0xBC00;
    s->phy_regs[PHY_REG_EXT_PHYSPCFC_CTL] = 0x0C60;
    s->phy_regs[PHY_REG_LED] = 0x4100;
    s->phy_regs[PHY_REG_EXT_PHYSPCFC_CTL2] = 0x000A;
    s->phy_regs[PHY_REG_EXT_PHYSPCFC_ST] = 0x848B;

    phy_update_link(s);
}

static void gem_reset(DeviceState *d)
{
A
Andreas Färber 已提交
952
    GemState *s = GEM(d);
953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013

    DB_PRINT("\n");

    /* Set post reset register values */
    memset(&s->regs[0], 0, sizeof(s->regs));
    s->regs[GEM_NWCFG] = 0x00080000;
    s->regs[GEM_NWSTATUS] = 0x00000006;
    s->regs[GEM_DMACFG] = 0x00020784;
    s->regs[GEM_IMR] = 0x07ffffff;
    s->regs[GEM_TXPAUSE] = 0x0000ffff;
    s->regs[GEM_TXPARTIALSF] = 0x000003ff;
    s->regs[GEM_RXPARTIALSF] = 0x000003ff;
    s->regs[GEM_MODID] = 0x00020118;
    s->regs[GEM_DESCONF] = 0x02500111;
    s->regs[GEM_DESCONF2] = 0x2ab13fff;
    s->regs[GEM_DESCONF5] = 0x002f2145;
    s->regs[GEM_DESCONF6] = 0x00000200;

    gem_phy_reset(s);

    gem_update_int_status(s);
}

static uint16_t gem_phy_read(GemState *s, unsigned reg_num)
{
    DB_PRINT("reg: %d value: 0x%04x\n", reg_num, s->phy_regs[reg_num]);
    return s->phy_regs[reg_num];
}

static void gem_phy_write(GemState *s, unsigned reg_num, uint16_t val)
{
    DB_PRINT("reg: %d value: 0x%04x\n", reg_num, val);

    switch (reg_num) {
    case PHY_REG_CONTROL:
        if (val & PHY_REG_CONTROL_RST) {
            /* Phy reset */
            gem_phy_reset(s);
            val &= ~(PHY_REG_CONTROL_RST | PHY_REG_CONTROL_LOOP);
            s->phy_loop = 0;
        }
        if (val & PHY_REG_CONTROL_ANEG) {
            /* Complete autonegotiation immediately */
            val &= ~PHY_REG_CONTROL_ANEG;
            s->phy_regs[PHY_REG_STATUS] |= PHY_REG_STATUS_ANEGCMPL;
        }
        if (val & PHY_REG_CONTROL_LOOP) {
            DB_PRINT("PHY placed in loopback\n");
            s->phy_loop = 1;
        } else {
            s->phy_loop = 0;
        }
        break;
    }
    s->phy_regs[reg_num] = val;
}

/*
 * gem_read32:
 * Read a GEM register.
 */
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Avi Kivity 已提交
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static uint64_t gem_read(void *opaque, hwaddr offset, unsigned size)
1015 1016 1017 1018 1019 1020 1021 1022 1023
{
    GemState *s;
    uint32_t retval;

    s = (GemState *)opaque;

    offset >>= 2;
    retval = s->regs[offset];

1024
    DB_PRINT("offset: 0x%04x read: 0x%08x\n", (unsigned)offset*4, retval);
1025 1026 1027

    switch (offset) {
    case GEM_ISR:
1028
        DB_PRINT("lowering irq on ISR read\n");
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
        qemu_set_irq(s->irq, 0);
        break;
    case GEM_PHYMNTNC:
        if (retval & GEM_PHYMNTNC_OP_R) {
            uint32_t phy_addr, reg_num;

            phy_addr = (retval & GEM_PHYMNTNC_ADDR) >> GEM_PHYMNTNC_ADDR_SHFT;
            if (phy_addr == BOARD_PHY_ADDRESS) {
                reg_num = (retval & GEM_PHYMNTNC_REG) >> GEM_PHYMNTNC_REG_SHIFT;
                retval &= 0xFFFF0000;
                retval |= gem_phy_read(s, reg_num);
            } else {
                retval |= 0xFFFF; /* No device at this address */
            }
        }
        break;
    }

    /* Squash read to clear bits */
    s->regs[offset] &= ~(s->regs_rtc[offset]);

    /* Do not provide write only bits */
    retval &= ~(s->regs_wo[offset]);

    DB_PRINT("0x%08x\n", retval);
    return retval;
}

/*
 * gem_write32:
 * Write a GEM register.
 */
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Avi Kivity 已提交
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static void gem_write(void *opaque, hwaddr offset, uint64_t val,
1062 1063 1064 1065 1066
        unsigned size)
{
    GemState *s = (GemState *)opaque;
    uint32_t readonly;

1067
    DB_PRINT("offset: 0x%04x write: 0x%08x ", (unsigned)offset, (unsigned)val);
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
    offset >>= 2;

    /* Squash bits which are read only in write value */
    val &= ~(s->regs_ro[offset]);
    /* Preserve (only) bits which are read only in register */
    readonly = s->regs[offset];
    readonly &= s->regs_ro[offset];

    /* Squash bits which are write 1 to clear */
    val &= ~(s->regs_w1c[offset] & val);

    /* Copy register write to backing store */
    s->regs[offset] = val | readonly;

    /* Handle register write side effects */
    switch (offset) {
    case GEM_NWCTRL:
        if (val & GEM_NWCTRL_TXSTART) {
            gem_transmit(s);
        }
        if (!(val & GEM_NWCTRL_TXENA)) {
            /* Reset to start of Q when transmit disabled. */
            s->tx_desc_addr = s->regs[GEM_TXQBASE];
        }
1092 1093 1094
        if (val & GEM_NWCTRL_RXENA) {
            qemu_flush_queued_packets(qemu_get_queue(s->nic));
        }
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
        break;

    case GEM_TXSTATUS:
        gem_update_int_status(s);
        break;
    case GEM_RXQBASE:
        s->rx_desc_addr = val;
        break;
    case GEM_TXQBASE:
        s->tx_desc_addr = val;
        break;
    case GEM_RXSTATUS:
        gem_update_int_status(s);
        break;
    case GEM_IER:
        s->regs[GEM_IMR] &= ~val;
        gem_update_int_status(s);
        break;
    case GEM_IDR:
        s->regs[GEM_IMR] |= val;
        gem_update_int_status(s);
        break;
    case GEM_PHYMNTNC:
        if (val & GEM_PHYMNTNC_OP_W) {
            uint32_t phy_addr, reg_num;

            phy_addr = (val & GEM_PHYMNTNC_ADDR) >> GEM_PHYMNTNC_ADDR_SHFT;
            if (phy_addr == BOARD_PHY_ADDRESS) {
                reg_num = (val & GEM_PHYMNTNC_REG) >> GEM_PHYMNTNC_REG_SHIFT;
                gem_phy_write(s, reg_num, val);
            }
        }
        break;
    }

    DB_PRINT("newval: 0x%08x\n", s->regs[offset]);
}

static const MemoryRegionOps gem_ops = {
    .read = gem_read,
    .write = gem_write,
    .endianness = DEVICE_LITTLE_ENDIAN,
};

1139
static void gem_cleanup(NetClientState *nc)
1140
{
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    GemState *s = qemu_get_nic_opaque(nc);
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    DB_PRINT("\n");
    s->nic = NULL;
}

1147
static void gem_set_link(NetClientState *nc)
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{
    DB_PRINT("\n");
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    phy_update_link(qemu_get_nic_opaque(nc));
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}

static NetClientInfo net_gem_info = {
1154
    .type = NET_CLIENT_OPTIONS_KIND_NIC,
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    .size = sizeof(NICState),
    .can_receive = gem_can_receive,
    .receive = gem_receive,
    .cleanup = gem_cleanup,
    .link_status_changed = gem_set_link,
};

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static int gem_init(SysBusDevice *sbd)
1163
{
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    DeviceState *dev = DEVICE(sbd);
    GemState *s = GEM(dev);
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    DB_PRINT("\n");

    gem_init_register_masks(s);
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    memory_region_init_io(&s->iomem, OBJECT(s), &gem_ops, s,
                          "enet", sizeof(s->regs));
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    sysbus_init_mmio(sbd, &s->iomem);
    sysbus_init_irq(sbd, &s->irq);
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    qemu_macaddr_default_if_unset(&s->conf.macaddr);

    s->nic = qemu_new_nic(&net_gem_info, &s->conf,
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            object_get_typename(OBJECT(dev)), dev->id, s);
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    return 0;
}

static const VMStateDescription vmstate_cadence_gem = {
    .name = "cadence_gem",
    .version_id = 1,
    .minimum_version_id = 1,
    .minimum_version_id_old = 1,
    .fields      = (VMStateField[]) {
        VMSTATE_UINT32_ARRAY(regs, GemState, GEM_MAXREG),
        VMSTATE_UINT16_ARRAY(phy_regs, GemState, 32),
        VMSTATE_UINT8(phy_loop, GemState),
        VMSTATE_UINT32(rx_desc_addr, GemState),
        VMSTATE_UINT32(tx_desc_addr, GemState),
    }
};

static Property gem_properties[] = {
    DEFINE_NIC_PROPERTIES(GemState, conf),
    DEFINE_PROP_END_OF_LIST(),
};

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

    sdc->init = gem_init;
    dc->props = gem_properties;
    dc->vmsd = &vmstate_cadence_gem;
    dc->reset = gem_reset;
}

1212
static const TypeInfo gem_info = {
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    .name  = TYPE_CADENCE_GEM,
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    .parent = TYPE_SYS_BUS_DEVICE,
    .instance_size  = sizeof(GemState),
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    .class_init = gem_class_init,
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};

static void gem_register_types(void)
{
    type_register_static(&gem_info);
}

type_init(gem_register_types)