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!
414 lines
14 KiB
C
414 lines
14 KiB
C
/*
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* Intel 82586 IEEE 802.3 Ethernet LAN Coprocessor.
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*
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* See:
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* Intel Microcommunications 1991
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* p1-1 to p1-37
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* Intel order No. 231658
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* ISBN 1-55512-119-5
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*
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* Unfortunately, the above chapter mentions neither
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* the System Configuration Pointer (SCP) nor the
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* Intermediate System Configuration Pointer (ISCP),
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* so we probably need to look elsewhere for the
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* whole story -- some recommend the "Intel LAN
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* Components manual" but I have neither a copy
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* nor a full reference. But "elsewhere" may be
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* in the same publication...
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* The description of a later device, the
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* "82596CA High-Performance 32-Bit Local Area Network
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* Coprocessor", (ibid. p1-38 to p1-109) does mention
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* the SCP and ISCP and also has an i82586 compatibility
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* mode. Even more useful is "AP-235 An 82586 Data Link
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* Driver" (ibid. p1-337 to p1-417).
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*/
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#define I82586_MEMZ (64 * 1024)
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#define I82586_SCP_ADDR (I82586_MEMZ - sizeof(scp_t))
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#define ADDR_LEN 6
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#define I82586NULL 0xFFFF
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#define toff(t,p,f) (unsigned short)((void *)(&((t *)((void *)0 + (p)))->f) - (void *)0)
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/*
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* System Configuration Pointer (SCP).
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*/
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typedef struct scp_t scp_t;
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struct scp_t
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{
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unsigned short scp_sysbus; /* 82586 bus width: */
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#define SCP_SY_16BBUS (0x0 << 0) /* 16 bits */
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#define SCP_SY_8BBUS (0x1 << 0) /* 8 bits. */
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unsigned short scp_junk[2]; /* Unused */
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unsigned short scp_iscpl; /* lower 16 bits of ISCP_ADDR */
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unsigned short scp_iscph; /* upper 16 bits of ISCP_ADDR */
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};
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/*
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* Intermediate System Configuration Pointer (ISCP).
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*/
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typedef struct iscp_t iscp_t;
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struct iscp_t
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{
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unsigned short iscp_busy; /* set by CPU before first CA, */
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/* cleared by 82586 after read. */
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unsigned short iscp_offset; /* offset of SCB */
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unsigned short iscp_basel; /* base of SCB */
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unsigned short iscp_baseh; /* " */
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};
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/*
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* System Control Block (SCB).
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* The 82586 writes its status to scb_status and then
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* raises an interrupt to alert the CPU.
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* The CPU writes a command to scb_command and
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* then issues a Channel Attention (CA) to alert the 82586.
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*/
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typedef struct scb_t scb_t;
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struct scb_t
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{
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unsigned short scb_status; /* Status of 82586 */
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#define SCB_ST_INT (0xF << 12) /* Some of: */
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#define SCB_ST_CX (0x1 << 15) /* Cmd completed */
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#define SCB_ST_FR (0x1 << 14) /* Frame received */
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#define SCB_ST_CNA (0x1 << 13) /* Cmd unit not active */
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#define SCB_ST_RNR (0x1 << 12) /* Rcv unit not ready */
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#define SCB_ST_JUNK0 (0x1 << 11) /* 0 */
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#define SCB_ST_CUS (0x7 << 8) /* Cmd unit status */
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#define SCB_ST_CUS_IDLE (0 << 8) /* Idle */
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#define SCB_ST_CUS_SUSP (1 << 8) /* Suspended */
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#define SCB_ST_CUS_ACTV (2 << 8) /* Active */
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#define SCB_ST_JUNK1 (0x1 << 7) /* 0 */
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#define SCB_ST_RUS (0x7 << 4) /* Rcv unit status */
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#define SCB_ST_RUS_IDLE (0 << 4) /* Idle */
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#define SCB_ST_RUS_SUSP (1 << 4) /* Suspended */
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#define SCB_ST_RUS_NRES (2 << 4) /* No resources */
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#define SCB_ST_RUS_RDY (4 << 4) /* Ready */
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unsigned short scb_command; /* Next command */
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#define SCB_CMD_ACK_CX (0x1 << 15) /* Ack cmd completion */
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#define SCB_CMD_ACK_FR (0x1 << 14) /* Ack frame received */
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#define SCB_CMD_ACK_CNA (0x1 << 13) /* Ack CU not active */
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#define SCB_CMD_ACK_RNR (0x1 << 12) /* Ack RU not ready */
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#define SCB_CMD_JUNKX (0x1 << 11) /* Unused */
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#define SCB_CMD_CUC (0x7 << 8) /* Command Unit command */
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#define SCB_CMD_CUC_NOP (0 << 8) /* Nop */
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#define SCB_CMD_CUC_GO (1 << 8) /* Start cbl_offset */
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#define SCB_CMD_CUC_RES (2 << 8) /* Resume execution */
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#define SCB_CMD_CUC_SUS (3 << 8) /* Suspend " */
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#define SCB_CMD_CUC_ABT (4 << 8) /* Abort " */
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#define SCB_CMD_RESET (0x1 << 7) /* Reset chip (hardware) */
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#define SCB_CMD_RUC (0x7 << 4) /* Receive Unit command */
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#define SCB_CMD_RUC_NOP (0 << 4) /* Nop */
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#define SCB_CMD_RUC_GO (1 << 4) /* Start rfa_offset */
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#define SCB_CMD_RUC_RES (2 << 4) /* Resume reception */
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#define SCB_CMD_RUC_SUS (3 << 4) /* Suspend " */
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#define SCB_CMD_RUC_ABT (4 << 4) /* Abort " */
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unsigned short scb_cbl_offset; /* Offset of first command unit */
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/* Action Command */
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unsigned short scb_rfa_offset; /* Offset of first Receive */
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/* Frame Descriptor in the */
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/* Receive Frame Area */
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unsigned short scb_crcerrs; /* Properly aligned frames */
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/* received with a CRC error */
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unsigned short scb_alnerrs; /* Misaligned frames received */
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/* with a CRC error */
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unsigned short scb_rscerrs; /* Frames lost due to no space */
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unsigned short scb_ovrnerrs; /* Frames lost due to slow bus */
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};
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#define scboff(p,f) toff(scb_t, p, f)
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/*
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* The eight Action Commands.
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*/
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typedef enum acmd_e acmd_e;
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enum acmd_e
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{
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acmd_nop = 0, /* Do nothing */
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acmd_ia_setup = 1, /* Load an (ethernet) address into the */
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/* 82586 */
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acmd_configure = 2, /* Update the 82586 operating parameters */
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acmd_mc_setup = 3, /* Load a list of (ethernet) multicast */
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/* addresses into the 82586 */
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acmd_transmit = 4, /* Transmit a frame */
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acmd_tdr = 5, /* Perform a Time Domain Reflectometer */
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/* test on the serial link */
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acmd_dump = 6, /* Copy 82586 registers to memory */
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acmd_diagnose = 7, /* Run an internal self test */
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};
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/*
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* Generic Action Command header.
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*/
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typedef struct ach_t ach_t;
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struct ach_t
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{
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unsigned short ac_status; /* Command status: */
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#define AC_SFLD_C (0x1 << 15) /* Command completed */
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#define AC_SFLD_B (0x1 << 14) /* Busy executing */
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#define AC_SFLD_OK (0x1 << 13) /* Completed error free */
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#define AC_SFLD_A (0x1 << 12) /* Command aborted */
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#define AC_SFLD_FAIL (0x1 << 11) /* Selftest failed */
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#define AC_SFLD_S10 (0x1 << 10) /* No carrier sense */
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/* during transmission */
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#define AC_SFLD_S9 (0x1 << 9) /* Tx unsuccessful: */
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/* (stopped) lost CTS */
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#define AC_SFLD_S8 (0x1 << 8) /* Tx unsuccessful: */
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/* (stopped) slow DMA */
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#define AC_SFLD_S7 (0x1 << 7) /* Tx deferred: */
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/* other link traffic */
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#define AC_SFLD_S6 (0x1 << 6) /* Heart Beat: collision */
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/* detect after last tx */
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#define AC_SFLD_S5 (0x1 << 5) /* Tx stopped: */
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/* excessive collisions */
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#define AC_SFLD_MAXCOL (0xF << 0) /* Collision count */
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unsigned short ac_command; /* Command specifier: */
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#define AC_CFLD_EL (0x1 << 15) /* End of command list */
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#define AC_CFLD_S (0x1 << 14) /* Suspend on completion */
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#define AC_CFLD_I (0x1 << 13) /* Interrupt on completion */
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#define AC_CFLD_CMD (0x7 << 0) /* acmd_e */
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unsigned short ac_link; /* Next Action Command */
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};
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#define acoff(p,f) toff(ach_t, p, f)
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/*
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* The Nop Action Command.
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*/
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typedef struct ac_nop_t ac_nop_t;
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struct ac_nop_t
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{
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ach_t nop_h;
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};
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/*
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* The IA-Setup Action Command.
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*/
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typedef struct ac_ias_t ac_ias_t;
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struct ac_ias_t
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{
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ach_t ias_h;
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unsigned char ias_addr[ADDR_LEN]; /* The (ethernet) address */
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};
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/*
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* The Configure Action Command.
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*/
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typedef struct ac_cfg_t ac_cfg_t;
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struct ac_cfg_t
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{
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ach_t cfg_h;
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unsigned char cfg_byte_cnt; /* Size foll data: 4-12 */
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#define AC_CFG_BYTE_CNT(v) (((v) & 0xF) << 0)
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unsigned char cfg_fifolim; /* FIFO threshold */
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#define AC_CFG_FIFOLIM(v) (((v) & 0xF) << 0)
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unsigned char cfg_byte8;
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#define AC_CFG_SAV_BF(v) (((v) & 0x1) << 7) /* Save rxd bad frames */
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#define AC_CFG_SRDY(v) (((v) & 0x1) << 6) /* SRDY/ARDY pin means */
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/* external sync. */
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unsigned char cfg_byte9;
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#define AC_CFG_ELPBCK(v) (((v) & 0x1) << 7) /* External loopback */
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#define AC_CFG_ILPBCK(v) (((v) & 0x1) << 6) /* Internal loopback */
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#define AC_CFG_PRELEN(v) (((v) & 0x3) << 4) /* Preamble length */
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#define AC_CFG_PLEN_2 0 /* 2 bytes */
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#define AC_CFG_PLEN_4 1 /* 4 bytes */
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#define AC_CFG_PLEN_8 2 /* 8 bytes */
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#define AC_CFG_PLEN_16 3 /* 16 bytes */
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#define AC_CFG_ALOC(v) (((v) & 0x1) << 3) /* Addr/len data is */
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/* explicit in buffers */
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#define AC_CFG_ADDRLEN(v) (((v) & 0x7) << 0) /* Bytes per address */
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unsigned char cfg_byte10;
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#define AC_CFG_BOFMET(v) (((v) & 0x1) << 7) /* Use alternate expo. */
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/* backoff method */
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#define AC_CFG_ACR(v) (((v) & 0x7) << 4) /* Accelerated cont. res. */
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#define AC_CFG_LINPRIO(v) (((v) & 0x7) << 0) /* Linear priority */
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unsigned char cfg_ifs; /* Interframe spacing */
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unsigned char cfg_slotl; /* Slot time (low byte) */
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unsigned char cfg_byte13;
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#define AC_CFG_RETRYNUM(v) (((v) & 0xF) << 4) /* Max. collision retry */
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#define AC_CFG_SLTTMHI(v) (((v) & 0x7) << 0) /* Slot time (high bits) */
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unsigned char cfg_byte14;
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#define AC_CFG_FLGPAD(v) (((v) & 0x1) << 7) /* Pad with HDLC flags */
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#define AC_CFG_BTSTF(v) (((v) & 0x1) << 6) /* Do HDLC bitstuffing */
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#define AC_CFG_CRC16(v) (((v) & 0x1) << 5) /* 16 bit CCITT CRC */
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#define AC_CFG_NCRC(v) (((v) & 0x1) << 4) /* Insert no CRC */
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#define AC_CFG_TNCRS(v) (((v) & 0x1) << 3) /* Tx even if no carrier */
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#define AC_CFG_MANCH(v) (((v) & 0x1) << 2) /* Manchester coding */
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#define AC_CFG_BCDIS(v) (((v) & 0x1) << 1) /* Disable broadcast */
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#define AC_CFG_PRM(v) (((v) & 0x1) << 0) /* Promiscuous mode */
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unsigned char cfg_byte15;
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#define AC_CFG_ICDS(v) (((v) & 0x1) << 7) /* Internal collision */
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/* detect source */
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#define AC_CFG_CDTF(v) (((v) & 0x7) << 4) /* Collision detect */
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/* filter in bit times */
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#define AC_CFG_ICSS(v) (((v) & 0x1) << 3) /* Internal carrier */
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/* sense source */
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#define AC_CFG_CSTF(v) (((v) & 0x7) << 0) /* Carrier sense */
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/* filter in bit times */
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unsigned short cfg_min_frm_len;
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#define AC_CFG_MNFRM(v) (((v) & 0xFF) << 0) /* Min. bytes/frame (<= 255) */
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};
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/*
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* The MC-Setup Action Command.
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*/
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typedef struct ac_mcs_t ac_mcs_t;
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struct ac_mcs_t
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{
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ach_t mcs_h;
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unsigned short mcs_cnt; /* No. of bytes of MC addresses */
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#if 0
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unsigned char mcs_data[ADDR_LEN]; /* The first MC address .. */
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...
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#endif
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};
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#define I82586_MAX_MULTICAST_ADDRESSES 128 /* Hardware hashed filter */
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/*
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* The Transmit Action Command.
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*/
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typedef struct ac_tx_t ac_tx_t;
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struct ac_tx_t
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{
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ach_t tx_h;
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unsigned short tx_tbd_offset; /* Address of list of buffers. */
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#if 0
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Linux packets are passed down with the destination MAC address
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and length/type field already prepended to the data,
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so we do not need to insert it. Consistent with this
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we must also set the AC_CFG_ALOC(..) flag during the
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ac_cfg_t action command.
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unsigned char tx_addr[ADDR_LEN]; /* The frame dest. address */
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unsigned short tx_length; /* The frame length */
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#endif /* 0 */
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};
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/*
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* The Time Domain Reflectometer Action Command.
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*/
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typedef struct ac_tdr_t ac_tdr_t;
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struct ac_tdr_t
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{
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ach_t tdr_h;
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unsigned short tdr_result; /* Result. */
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#define AC_TDR_LNK_OK (0x1 << 15) /* No link problem */
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#define AC_TDR_XCVR_PRB (0x1 << 14) /* Txcvr cable problem */
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#define AC_TDR_ET_OPN (0x1 << 13) /* Open on the link */
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#define AC_TDR_ET_SRT (0x1 << 12) /* Short on the link */
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#define AC_TDR_TIME (0x7FF << 0) /* Distance to problem */
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/* site in transmit */
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/* clock cycles */
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};
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/*
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* The Dump Action Command.
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*/
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typedef struct ac_dmp_t ac_dmp_t;
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struct ac_dmp_t
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{
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ach_t dmp_h;
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unsigned short dmp_offset; /* Result. */
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};
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/*
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* Size of the result of the dump command.
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*/
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#define DUMPBYTES 170
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/*
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* The Diagnose Action Command.
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*/
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typedef struct ac_dgn_t ac_dgn_t;
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struct ac_dgn_t
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{
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ach_t dgn_h;
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};
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/*
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* Transmit Buffer Descriptor (TBD).
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*/
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typedef struct tbd_t tbd_t;
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struct tbd_t
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{
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unsigned short tbd_status; /* Written by the CPU */
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#define TBD_STATUS_EOF (0x1 << 15) /* This TBD is the */
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/* last for this frame */
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#define TBD_STATUS_ACNT (0x3FFF << 0) /* Actual count of data */
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/* bytes in this buffer */
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unsigned short tbd_next_bd_offset; /* Next in list */
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unsigned short tbd_bufl; /* Buffer address (low) */
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unsigned short tbd_bufh; /* " " (high) */
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};
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/*
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* Receive Buffer Descriptor (RBD).
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*/
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typedef struct rbd_t rbd_t;
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struct rbd_t
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{
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unsigned short rbd_status; /* Written by the 82586 */
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#define RBD_STATUS_EOF (0x1 << 15) /* This RBD is the */
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/* last for this frame */
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#define RBD_STATUS_F (0x1 << 14) /* ACNT field is valid */
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#define RBD_STATUS_ACNT (0x3FFF << 0) /* Actual no. of data */
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/* bytes in this buffer */
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unsigned short rbd_next_rbd_offset; /* Next rbd in list */
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unsigned short rbd_bufl; /* Data pointer (low) */
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unsigned short rbd_bufh; /* " " (high) */
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unsigned short rbd_el_size; /* EL+Data buf. size */
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#define RBD_EL (0x1 << 15) /* This BD is the */
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/* last in the list */
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#define RBD_SIZE (0x3FFF << 0) /* No. of bytes the */
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/* buffer can hold */
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};
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#define rbdoff(p,f) toff(rbd_t, p, f)
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/*
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* Frame Descriptor (FD).
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*/
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typedef struct fd_t fd_t;
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struct fd_t
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{
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unsigned short fd_status; /* Written by the 82586 */
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#define FD_STATUS_C (0x1 << 15) /* Completed storing frame */
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#define FD_STATUS_B (0x1 << 14) /* FD was consumed by RU */
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#define FD_STATUS_OK (0x1 << 13) /* Frame rxd successfully */
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#define FD_STATUS_S11 (0x1 << 11) /* CRC error */
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#define FD_STATUS_S10 (0x1 << 10) /* Alignment error */
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#define FD_STATUS_S9 (0x1 << 9) /* Ran out of resources */
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#define FD_STATUS_S8 (0x1 << 8) /* Rx DMA overrun */
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#define FD_STATUS_S7 (0x1 << 7) /* Frame too short */
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#define FD_STATUS_S6 (0x1 << 6) /* No EOF flag */
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unsigned short fd_command; /* Command */
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#define FD_COMMAND_EL (0x1 << 15) /* Last FD in list */
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#define FD_COMMAND_S (0x1 << 14) /* Suspend RU after rx */
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unsigned short fd_link_offset; /* Next FD */
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unsigned short fd_rbd_offset; /* First RBD (data) */
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/* Prepared by CPU, */
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/* updated by 82586 */
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#if 0
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I think the rest is unused since we
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have set AC_CFG_ALOC(..). However, just
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in case, we leave the space.
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#endif /* 0 */
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unsigned char fd_dest[ADDR_LEN]; /* Destination address */
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/* Written by 82586 */
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unsigned char fd_src[ADDR_LEN]; /* Source address */
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/* Written by 82586 */
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unsigned short fd_length; /* Frame length or type */
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/* Written by 82586 */
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};
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#define fdoff(p,f) toff(fd_t, p, f)
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/*
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* This software may only be used and distributed
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* according to the terms of the GNU General Public License.
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*
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* For more details, see wavelan.c.
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*/
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