1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
246 lines
9.5 KiB
C
246 lines
9.5 KiB
C
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/*
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* snull.h -- definitions for the network module
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*
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* Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet
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* Copyright (C) 2001 O'Reilly & Associates
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*
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* The source code in this file can be freely used, adapted,
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* and redistributed in source or binary form, so long as an
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* acknowledgment appears in derived source files. The citation
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* should list that the code comes from the book "Linux Device
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* Drivers" by Alessandro Rubini and Jonathan Corbet, published
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* by O'Reilly & Associates. No warranty is attached;
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* we cannot take responsibility for errors or fitness for use.
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*/
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/* version dependencies have been confined to a separate file */
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/* Tunable parameters */
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#define TX_RING_ENTRIES 64 /* 64-512?*/
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#define RX_RING_ENTRIES 16 /* Do not change */
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/* Internal constants */
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#define TX_RING_BUFFER_SIZE (TX_RING_ENTRIES*sizeof(tx_packet))
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#define RX_BUFFER_SIZE 1546 /* ethenet packet size */
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#define METH_RX_BUFF_SIZE 4096
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#define METH_RX_HEAD 34 /* status + 3 quad garbage-fill + 2 byte zero-pad */
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#define RX_BUFFER_OFFSET (sizeof(rx_status_vector)+2) /* staus vector + 2 bytes of padding */
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#define RX_BUCKET_SIZE 256
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#undef BIT
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#define BIT(x) (1UL << (x))
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/* For more detailed explanations of what each field menas,
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see Nick's great comments to #defines below (or docs, if
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you are lucky enough toget hold of them :)*/
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/* tx status vector is written over tx command header upon
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dma completion. */
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typedef struct tx_status_vector {
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u64 sent:1; /* always set to 1...*/
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u64 pad0:34;/* always set to 0 */
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u64 flags:9; /*I'm too lazy to specify each one separately at the moment*/
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u64 col_retry_cnt:4; /*collision retry count*/
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u64 len:16; /*Transmit length in bytes*/
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} tx_status_vector;
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/*
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* Each packet is 128 bytes long.
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* It consists of header, 0-3 concatination
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* buffer pointers and up to 120 data bytes.
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*/
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typedef struct tx_packet_hdr {
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u64 pad1:36; /*should be filled with 0 */
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u64 cat_ptr3_valid:1, /*Concatination pointer valid flags*/
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cat_ptr2_valid:1,
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cat_ptr1_valid:1;
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u64 tx_int_flag:1; /*Generate TX intrrupt when packet has been sent*/
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u64 term_dma_flag:1; /*Terminate transmit DMA on transmit abort conditions*/
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u64 data_offset:7; /*Starting byte offset in ring data block*/
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u64 data_len:16; /*Length of valid data in bytes-1*/
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} tx_packet_hdr;
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typedef union tx_cat_ptr {
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struct {
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u64 pad2:16; /* should be 0 */
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u64 len:16; /*length of buffer data - 1*/
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u64 start_addr:29; /*Physical starting address*/
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u64 pad1:3; /* should be zero */
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} form;
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u64 raw;
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} tx_cat_ptr;
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typedef struct tx_packet {
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union {
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tx_packet_hdr header;
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tx_status_vector res;
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u64 raw;
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}header;
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union {
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tx_cat_ptr cat_buf[3];
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char dt[120];
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} data;
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} tx_packet;
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typedef union rx_status_vector {
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volatile struct {
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u64 pad1:1;/*fill it with ones*/
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u64 pad2:15;/*fill with 0*/
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u64 ip_chk_sum:16;
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u64 seq_num:5;
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u64 mac_addr_match:1;
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u64 mcast_addr_match:1;
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u64 carrier_event_seen:1;
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u64 bad_packet:1;
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u64 long_event_seen:1;
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u64 invalid_preamble:1;
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u64 broadcast:1;
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u64 multicast:1;
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u64 crc_error:1;
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u64 huh:1;/*???*/
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u64 rx_code_violation:1;
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u64 rx_len:16;
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} parsed;
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volatile u64 raw;
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} rx_status_vector;
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typedef struct rx_packet {
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rx_status_vector status;
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u64 pad[3]; /* For whatever reason, there needs to be 4 double-word offset */
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u16 pad2;
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char buf[METH_RX_BUFF_SIZE-sizeof(rx_status_vector)-3*sizeof(u64)-sizeof(u16)];/* data */
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} rx_packet;
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#define TX_INFO_RPTR 0x00FF0000
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#define TX_INFO_WPTR 0x000000FF
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/* Bits in METH_MAC */
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#define SGI_MAC_RESET BIT(0) /* 0: MAC110 active in run mode, 1: Global reset signal to MAC110 core is active */
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#define METH_PHY_FDX BIT(1) /* 0: Disable full duplex, 1: Enable full duplex */
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#define METH_PHY_LOOP BIT(2) /* 0: Normal operation, follows 10/100mbit and M10T/MII select, 1: loops internal MII bus */
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/* selects ignored */
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#define METH_100MBIT BIT(3) /* 0: 10meg mode, 1: 100meg mode */
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#define METH_PHY_MII BIT(4) /* 0: MII selected, 1: SIA selected */
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/* Note: when loopback is set this bit becomes collision control. Setting this bit will */
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/* cause a collision to be reported. */
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/* Bits 5 and 6 are used to determine the the Destination address filter mode */
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#define METH_ACCEPT_MY 0 /* 00: Accept PHY address only */
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#define METH_ACCEPT_MCAST 0x20 /* 01: Accept physical, broadcast, and multicast filter matches only */
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#define METH_ACCEPT_AMCAST 0x40 /* 10: Accept physical, broadcast, and all multicast packets */
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#define METH_PROMISC 0x60 /* 11: Promiscious mode */
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#define METH_PHY_LINK_FAIL BIT(7) /* 0: Link failure detection disabled, 1: Hardware scans for link failure in PHY */
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#define METH_MAC_IPG 0x1ffff00
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#define METH_DEFAULT_IPG ((17<<15) | (11<<22) | (21<<8))
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/* 0x172e5c00 */ /* 23, 23, 23 */ /*0x54A9500 *//*21,21,21*/
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/* Bits 8 through 14 are used to determine Inter-Packet Gap between "Back to Back" packets */
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/* The gap depends on the clock speed of the link, 80ns per increment for 100baseT, 800ns */
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/* per increment for 10BaseT */
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/* Bits 15 through 21 are used to determine IPGR1 */
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/* Bits 22 through 28 are used to determine IPGR2 */
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#define METH_REV_SHIFT 29 /* Bits 29 through 31 are used to determine the revision */
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/* 000: Inital revision */
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/* 001: First revision, Improved TX concatenation */
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/* DMA control bits */
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#define METH_RX_OFFSET_SHIFT 12 /* Bits 12:14 of DMA control register indicate starting offset of packet data for RX operation */
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#define METH_RX_DEPTH_SHIFT 4 /* Bits 8:4 define RX fifo depth -- when # of RX fifo entries != depth, interrupt is generted */
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#define METH_DMA_TX_EN BIT(1) /* enable TX DMA */
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#define METH_DMA_TX_INT_EN BIT(0) /* enable TX Buffer Empty interrupt */
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#define METH_DMA_RX_EN BIT(15) /* Enable RX */
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#define METH_DMA_RX_INT_EN BIT(9) /* Enable interrupt on RX packet */
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/* RX FIFO MCL Info bits */
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#define METH_RX_FIFO_WPTR(x) (((x)>>16)&0xf)
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#define METH_RX_FIFO_RPTR(x) (((x)>>8)&0xf)
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#define METH_RX_FIFO_DEPTH(x) ((x)&0x1f)
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/* RX status bits */
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#define METH_RX_ST_VALID BIT(63)
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#define METH_RX_ST_RCV_CODE_VIOLATION BIT(16)
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#define METH_RX_ST_DRBL_NBL BIT(17)
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#define METH_RX_ST_CRC_ERR BIT(18)
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#define METH_RX_ST_MCAST_PKT BIT(19)
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#define METH_RX_ST_BCAST_PKT BIT(20)
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#define METH_RX_ST_INV_PREAMBLE_CTX BIT(21)
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#define METH_RX_ST_LONG_EVT_SEEN BIT(22)
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#define METH_RX_ST_BAD_PACKET BIT(23)
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#define METH_RX_ST_CARRIER_EVT_SEEN BIT(24)
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#define METH_RX_ST_MCAST_FILTER_MATCH BIT(25)
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#define METH_RX_ST_PHYS_ADDR_MATCH BIT(26)
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#define METH_RX_STATUS_ERRORS \
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( \
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METH_RX_ST_RCV_CODE_VIOLATION| \
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METH_RX_ST_CRC_ERR| \
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METH_RX_ST_INV_PREAMBLE_CTX| \
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METH_RX_ST_LONG_EVT_SEEN| \
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METH_RX_ST_BAD_PACKET| \
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METH_RX_ST_CARRIER_EVT_SEEN \
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)
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/* Bits in METH_INT */
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/* Write _1_ to corresponding bit to clear */
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#define METH_INT_TX_EMPTY BIT(0) /* 0: No interrupt pending, 1: The TX ring buffer is empty */
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#define METH_INT_TX_PKT BIT(1) /* 0: No interrupt pending */
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/* 1: A TX message had the INT request bit set, the packet has been sent. */
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#define METH_INT_TX_LINK_FAIL BIT(2) /* 0: No interrupt pending, 1: PHY has reported a link failure */
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#define METH_INT_MEM_ERROR BIT(3) /* 0: No interrupt pending */
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/* 1: A memory error occurred durring DMA, DMA stopped, Fatal */
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#define METH_INT_TX_ABORT BIT(4) /* 0: No interrupt pending, 1: The TX aborted operation, DMA stopped, FATAL */
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#define METH_INT_RX_THRESHOLD BIT(5) /* 0: No interrupt pending, 1: Selected receive threshold condition Valid */
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#define METH_INT_RX_UNDERFLOW BIT(6) /* 0: No interrupt pending, 1: FIFO was empty, packet could not be queued */
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#define METH_INT_RX_OVERFLOW BIT(7) /* 0: No interrupt pending, 1: DMA FIFO Overflow, DMA stopped, FATAL */
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/*#define METH_INT_RX_RPTR_MASK 0x0001F00*/ /* Bits 8 through 12 alias of RX read-pointer */
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#define METH_INT_RX_RPTR_MASK 0x0000F00 /* Bits 8 through 11 alias of RX read-pointer - so, is Rx FIFO 16 or 32 entry?*/
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/* Bits 13 through 15 are always 0. */
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#define METH_INT_TX_RPTR_MASK 0x1FF0000 /* Bits 16 through 24 alias of TX read-pointer */
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#define METH_INT_RX_SEQ_MASK 0x2E000000 /* Bits 25 through 29 are the starting seq number for the message at the */
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/* top of the queue */
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#define METH_INT_ERROR (METH_INT_TX_LINK_FAIL| \
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METH_INT_MEM_ERROR| \
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METH_INT_TX_ABORT| \
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METH_INT_RX_OVERFLOW| \
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METH_INT_RX_UNDERFLOW)
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#define METH_INT_MCAST_HASH BIT(30) /* If RX DMA is enabled the hash select logic output is latched here */
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/* TX status bits */
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#define METH_TX_ST_DONE BIT(63) /* TX complete */
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#define METH_TX_ST_SUCCESS BIT(23) /* Packet was transmitted successfully */
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#define METH_TX_ST_TOOLONG BIT(24) /* TX abort due to excessive length */
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#define METH_TX_ST_UNDERRUN BIT(25) /* TX abort due to underrun (?) */
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#define METH_TX_ST_EXCCOLL BIT(26) /* TX abort due to excess collisions */
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#define METH_TX_ST_DEFER BIT(27) /* TX abort due to excess deferals */
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#define METH_TX_ST_LATECOLL BIT(28) /* TX abort due to late collision */
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/* Tx command header bits */
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#define METH_TX_CMD_INT_EN BIT(24) /* Generate TX interrupt when packet is sent */
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/* Phy MDIO interface busy flag */
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#define MDIO_BUSY BIT(16)
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#define MDIO_DATA_MASK 0xFFFF
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/* PHY defines */
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#define PHY_QS6612X 0x0181441 /* Quality TX */
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#define PHY_ICS1889 0x0015F41 /* ICS FX */
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#define PHY_ICS1890 0x0015F42 /* ICS TX */
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#define PHY_DP83840 0x20005C0 /* National TX */
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#define ADVANCE_RX_PTR(x) x=(x+1)&(RX_RING_ENTRIES-1)
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