92 lines
3.8 KiB
C
92 lines
3.8 KiB
C
/* Definitions for the 3Com 3c503 Etherlink 2. */
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/* This file is distributed under the GPL.
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Many of these names and comments are directly from the Crynwr packet
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drivers, which are released under the GPL. */
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#define EL2H (dev->base_addr + 0x400)
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#define EL2L (dev->base_addr)
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/* Vendor unique hardware addr. prefix. 3Com has 2 because they ran
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out of available addresses on the first one... */
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#define OLD_3COM_ID 0x02608c
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#define NEW_3COM_ID 0x0020af
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/* Shared memory management parameters. NB: The 8 bit cards have only
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one bank (MB1) which serves both Tx and Rx packet space. The 16bit
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cards have 2 banks, MB0 for Tx packets, and MB1 for Rx packets.
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You choose which bank appears in the sh. mem window with EGACFR_MBSn */
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#define EL2_MB0_START_PG (0x00) /* EL2/16 Tx packets go in bank 0 */
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#define EL2_MB1_START_PG (0x20) /* First page of bank 1 */
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#define EL2_MB1_STOP_PG (0x40) /* Last page +1 of bank 1 */
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/* 3Com 3c503 ASIC registers */
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#define E33G_STARTPG (EL2H+0) /* Start page, matching EN0_STARTPG */
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#define E33G_STOPPG (EL2H+1) /* Stop page, must match EN0_STOPPG */
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#define E33G_DRQCNT (EL2H+2) /* DMA burst count */
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#define E33G_IOBASE (EL2H+3) /* Read of I/O base jumpers. */
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/* (non-useful, but it also appears at the end of EPROM space) */
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#define E33G_ROMBASE (EL2H+4) /* Read of memory base jumpers. */
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#define E33G_GACFR (EL2H+5) /* Config/setup bits for the ASIC GA */
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#define E33G_CNTRL (EL2H+6) /* Board's main control register */
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#define E33G_STATUS (EL2H+7) /* Status on completions. */
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#define E33G_IDCFR (EL2H+8) /* Interrupt/DMA config register */
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/* (Which IRQ to assert, DMA chan to use) */
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#define E33G_DMAAH (EL2H+9) /* High byte of DMA address reg */
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#define E33G_DMAAL (EL2H+10) /* Low byte of DMA address reg */
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/* "Vector pointer" - if this address matches a read, the EPROM (rather than
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shared RAM) is mapped into memory space. */
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#define E33G_VP2 (EL2H+11)
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#define E33G_VP1 (EL2H+12)
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#define E33G_VP0 (EL2H+13)
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#define E33G_FIFOH (EL2H+14) /* FIFO for programmed I/O moves */
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#define E33G_FIFOL (EL2H+15) /* ... low byte of above. */
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/* Bits in E33G_CNTRL register: */
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#define ECNTRL_RESET (0x01) /* Software reset of the ASIC and 8390 */
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#define ECNTRL_THIN (0x02) /* Onboard xcvr enable, AUI disable */
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#define ECNTRL_AUI (0x00) /* Onboard xcvr disable, AUI enable */
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#define ECNTRL_SAPROM (0x04) /* Map the station address prom */
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#define ECNTRL_DBLBFR (0x20) /* FIFO configuration bit */
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#define ECNTRL_OUTPUT (0x40) /* PC-to-3C503 direction if 1 */
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#define ECNTRL_INPUT (0x00) /* 3C503-to-PC direction if 0 */
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#define ECNTRL_START (0x80) /* Start the DMA logic */
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/* Bits in E33G_STATUS register: */
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#define ESTAT_DPRDY (0x80) /* Data port (of FIFO) ready */
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#define ESTAT_UFLW (0x40) /* Tried to read FIFO when it was empty */
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#define ESTAT_OFLW (0x20) /* Tried to write FIFO when it was full */
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#define ESTAT_DTC (0x10) /* Terminal Count from PC bus DMA logic */
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#define ESTAT_DIP (0x08) /* DMA In Progress */
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/* Bits in E33G_GACFR register: */
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#define EGACFR_NIM (0x80) /* NIC interrupt mask */
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#define EGACFR_TCM (0x40) /* DMA term. count interrupt mask */
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#define EGACFR_RSEL (0x08) /* Map a bank of card mem into system mem */
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#define EGACFR_MBS2 (0x04) /* Memory bank select, bit 2. */
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#define EGACFR_MBS1 (0x02) /* Memory bank select, bit 1. */
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#define EGACFR_MBS0 (0x01) /* Memory bank select, bit 0. */
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#define EGACFR_NORM (0x49) /* TCM | RSEL | MBS0 */
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#define EGACFR_IRQOFF (0xc9) /* TCM | RSEL | MBS0 | NIM */
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/*
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MBS2 MBS1 MBS0 Sh. mem windows card mem at:
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---- ---- ---- -----------------------------
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0 0 0 0x0000 -- bank 0
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0 0 1 0x2000 -- bank 1 (only choice for 8bit card)
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0 1 0 0x4000 -- bank 2, not used
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0 1 1 0x6000 -- bank 3, not used
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There was going to be a 32k card that used bank 2 and 3, but it
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never got produced.
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*/
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/* End of 3C503 parameter definitions */
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