/* * 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 */ #include "sysbus.h" #include "net/net.h" #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; } typedef struct { SysBusDevice busdev; 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 */ uint32_t rx_desc_addr; uint32_t tx_desc_addr; } 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) { DB_PRINT("down %d\n", s->nic->nc.link_down); /* Autonegotiation status mirrors link status. */ if (s->nic->nc.link_down) { 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); } } static int gem_can_receive(NetClientState *nc) { GemState *s; s = DO_UPCAST(NICState, nc, nc)->opaque; 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) { uint32_t new_interrupts = 0; /* Packet transmitted ? */ if (s->regs[GEM_TXSTATUS] & GEM_TXSTATUS_TXCMPL) { new_interrupts |= GEM_INT_TXCMPL; } /* End of TX ring ? */ if (s->regs[GEM_TXSTATUS] & GEM_TXSTATUS_USED) { new_interrupts |= GEM_INT_TXUSED; } /* Frame received ? */ if (s->regs[GEM_RXSTATUS] & GEM_RXSTATUS_FRMRCVD) { new_interrupts |= GEM_INT_RXCMPL; } /* RX ring full ? */ if (s->regs[GEM_RXSTATUS] & GEM_RXSTATUS_NOBUF) { new_interrupts |= GEM_INT_RXUSED; } s->regs[GEM_ISR] |= new_interrupts & ~(s->regs[GEM_IMR]); if (s->regs[GEM_ISR]) { DB_PRINT("asserting int. (0x%08x)\n", s->regs[GEM_ISR]); qemu_set_irq(s->irq, 1); } else { qemu_set_irq(s->irq, 0); } } /* * 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. */ static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size) { unsigned desc[2]; hwaddr packet_desc_addr, last_desc_addr; GemState *s; unsigned rxbufsize, bytes_to_copy; unsigned rxbuf_offset; uint8_t rxbuf[2048]; uint8_t *rxbuf_ptr; s = DO_UPCAST(NICState, nc, nc)->opaque; /* Do nothing if receive is not enabled. */ if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_RXENA)) { 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); memset(rxbuf + size, 0, sizeof(rxbuf) - size); 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) { DB_PRINT("read descriptor 0x%x\n", packet_desc_addr); /* 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) { DB_PRINT("descriptor 0x%x owned by sw.\n", packet_desc_addr); s->regs[GEM_RXSTATUS] |= GEM_RXSTATUS_NOBUF; /* 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", packet_desc_addr); 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]; } else { s->rx_desc_addr += 8; } DB_PRINT("set SOF, OWN on descriptor 0x%08x\n", packet_desc_addr); /* 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; /* 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]; hwaddr packet_desc_addr; 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)) { DB_PRINT("Invalid TX descriptor @ 0x%x\n", packet_desc_addr); 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; /* 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) { gem_receive(&s->nic->nc, tx_packet, total_bytes); } else { qemu_send_packet(&s->nic->nc, tx_packet, total_bytes); } /* 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; 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) { GemState *s = FROM_SYSBUS(GemState, SYS_BUS_DEVICE(d)); 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. */ static uint64_t gem_read(void *opaque, hwaddr offset, unsigned size) { GemState *s; uint32_t retval; s = (GemState *)opaque; offset >>= 2; retval = s->regs[offset]; DB_PRINT("offset: 0x%04x read: 0x%08x\n", offset*4, retval); switch (offset) { case GEM_ISR: 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. */ static void gem_write(void *opaque, hwaddr offset, uint64_t val, unsigned size) { GemState *s = (GemState *)opaque; uint32_t readonly; DB_PRINT("offset: 0x%04x write: 0x%08x ", offset, (unsigned)val); 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]; } if (!(val & GEM_NWCTRL_RXENA)) { /* Reset to start of Q when receive disabled. */ s->rx_desc_addr = s->regs[GEM_RXQBASE]; } 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, }; static void gem_cleanup(NetClientState *nc) { GemState *s = DO_UPCAST(NICState, nc, nc)->opaque; DB_PRINT("\n"); s->nic = NULL; } static void gem_set_link(NetClientState *nc) { DB_PRINT("\n"); phy_update_link(DO_UPCAST(NICState, nc, nc)->opaque); } static NetClientInfo net_gem_info = { .type = NET_CLIENT_OPTIONS_KIND_NIC, .size = sizeof(NICState), .can_receive = gem_can_receive, .receive = gem_receive, .cleanup = gem_cleanup, .link_status_changed = gem_set_link, }; static int gem_init(SysBusDevice *dev) { GemState *s; DB_PRINT("\n"); s = FROM_SYSBUS(GemState, dev); gem_init_register_masks(s); memory_region_init_io(&s->iomem, &gem_ops, s, "enet", sizeof(s->regs)); sysbus_init_mmio(dev, &s->iomem); sysbus_init_irq(dev, &s->irq); qemu_macaddr_default_if_unset(&s->conf.macaddr); s->nic = qemu_new_nic(&net_gem_info, &s->conf, object_get_typename(OBJECT(dev)), dev->qdev.id, s); 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; } static const TypeInfo gem_info = { .class_init = gem_class_init, .name = "cadence_gem", .parent = TYPE_SYS_BUS_DEVICE, .instance_size = sizeof(GemState), }; static void gem_register_types(void) { type_register_static(&gem_info); } type_init(gem_register_types)