| /* |
| * 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) |