Annotation of sys/arch/sparc/dev/if_ie.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: if_ie.h,v 1.2 1997/08/08 08:25:11 downsj Exp $ */
! 2: /* $NetBSD: if_ie.h,v 1.4 1994/12/16 22:01:11 deraadt Exp $ */
! 3:
! 4: /*
! 5: * if_sunie.h
! 6: *
! 7: * sun's ie interface
! 8: */
! 9:
! 10: /*
! 11: * programming notes:
! 12: *
! 13: * the ie chip operates in a 24 bit address space.
! 14: *
! 15: * most ie interfaces appear to be divided into two parts:
! 16: * - generic 586 stuff
! 17: * - board specific
! 18: *
! 19: * generic:
! 20: * the generic stuff of the ie chip is all done with data structures
! 21: * that live in the chip's memory address space. the chip expects
! 22: * its main data structure (the sys conf ptr -- SCP) to be at a fixed
! 23: * address in its 24 bit space: 0xfffff4
! 24: *
! 25: * the SCP points to another structure called the ISCP.
! 26: * the ISCP points to another structure called the SCB.
! 27: * the SCB has a status field, a linked list of "commands", and
! 28: * a linked list of "receive buffers". these are data structures that
! 29: * live in memory, not registers.
! 30: *
! 31: * board:
! 32: * to get the chip to do anything, you first put a command in the
! 33: * command data structure list. then you have to signal "attention"
! 34: * to the chip to get it to look at the command. how you
! 35: * signal attention depends on what board you have... on PC's
! 36: * there is an i/o port number to do this, on sun's there is a
! 37: * register bit you toggle.
! 38: *
! 39: * to get data from the chip you program it to interrupt...
! 40: *
! 41: *
! 42: * sun issues:
! 43: *
! 44: * there are 3 kinds of sun "ie" interfaces:
! 45: * 1 - a VME/multibus card
! 46: * 2 - an on-board interface (sun3's, sun-4/100's, and sun-4/200's)
! 47: * 3 - another VME board called the 3E
! 48: *
! 49: * the VME boards lives in vme16 space. only 16 and 8 bit accesses
! 50: * are allowed, so functions that copy data must be aware of this.
! 51: *
! 52: * the chip is an intel chip. this means that the byte order
! 53: * on all the "short"s in the chip's data structures is wrong.
! 54: * so, constants described in the intel docs are swapped for the sun.
! 55: * that means that any buffer pointers you give the chip must be
! 56: * swapped to intel format. yuck.
! 57: *
! 58: * VME/multibus interface:
! 59: * for the multibus interface the board ignores the top 4 bits
! 60: * of the chip address. the multibus interface seems to have its
! 61: * own MMU like page map (without protections or valid bits, etc).
! 62: * there are 256 pages of physical memory on the board (each page
! 63: * is 1024 bytes). there are 1024 slots in the page map. so,
! 64: * a 1024 byte page takes up 10 bits of address for the offset,
! 65: * and if there are 1024 slots in the page that is another 10 bits
! 66: * of the address. that makes a 20 bit address, and as stated
! 67: * earlier the board ignores the top 4 bits, so that accounts
! 68: * for all 24 bits of address.
! 69: *
! 70: * note that the last entry of the page map maps the top of the
! 71: * 24 bit address space and that the SCP is supposed to be at
! 72: * 0xfffff4 (taking into account allignment). so,
! 73: * for multibus, that entry in the page map has to be used for the SCP.
! 74: *
! 75: * the page map effects BOTH how the ie chip sees the
! 76: * memory, and how the host sees it.
! 77: *
! 78: * the page map is part of the "register" area of the board
! 79: *
! 80: * on-board interface:
! 81: *
! 82: * <fill in useful info later>
! 83: *
! 84: *
! 85: * VME3E interface:
! 86: *
! 87: * <fill in useful info later>
! 88: *
! 89: */
! 90:
! 91: /*
! 92: * PART 1: VME/multibus defs
! 93: */
! 94: #define IEVME_PAGESIZE 1024 /* bytes */
! 95: #define IEVME_PAGSHIFT 10 /* bits */
! 96: #define IEVME_NPAGES 256 /* number of pages on chip */
! 97: #define IEVME_MAPSZ 1024 /* number of entries in the map */
! 98:
! 99: /*
! 100: * PTE for the page map
! 101: */
! 102: #define IEVME_SBORDR 0x8000 /* sun byte order */
! 103: #define IEVME_IBORDR 0x0000 /* intel byte ordr */
! 104:
! 105: #define IEVME_P2MEM 0x2000 /* memory is on P2 */
! 106: #define IEVME_OBMEM 0x0000 /* memory is on board */
! 107:
! 108: #define IEVME_PGMASK 0x0fff /* gives the physical page frame number */
! 109:
! 110: struct ievme {
! 111: u_short pgmap[IEVME_MAPSZ];
! 112: u_short xxx[32]; /* prom */
! 113: u_short status; /* see below for bits */
! 114: u_short xxx2; /* filler */
! 115: u_short pectrl; /* parity control (see below) */
! 116: u_short peaddr; /* low 16 bits of address */
! 117: };
! 118:
! 119: /*
! 120: * status bits
! 121: */
! 122: #define IEVME_RESET 0x8000 /* reset board */
! 123: #define IEVME_ONAIR 0x4000 /* go out of loopback 'on-air' */
! 124: #define IEVME_ATTEN 0x2000 /* attention */
! 125: #define IEVME_IENAB 0x1000 /* interrupt enable */
! 126: #define IEVME_PEINT 0x0800 /* parity error interrupt enable */
! 127: #define IEVME_PERR 0x0200 /* parity error flag */
! 128: #define IEVME_INT 0x0100 /* interrupt flag */
! 129: #define IEVME_P2EN 0x0020 /* enable p2 bus */
! 130: #define IEVME_256K 0x0010 /* 256kb rams */
! 131: #define IEVME_HADDR 0x000f /* mask for bits 17-20 of address */
! 132:
! 133: /*
! 134: * parity control
! 135: */
! 136: #define IEVME_PARACK 0x0100 /* parity error ack */
! 137: #define IEVME_PARSRC 0x0080 /* parity error source */
! 138: #define IEVME_PAREND 0x0040 /* which end of the data got the error */
! 139: #define IEVME_PARADR 0x000f /* mask to get bits 17-20 of parity address */
! 140:
! 141:
! 142: /*
! 143: * PART 2: the on-board interface
! 144: */
! 145: struct ieob {
! 146: u_char obctrl;
! 147: };
! 148: #define IEOB_NORSET 0x80 /* don't reset the board */
! 149: #define IEOB_ONAIR 0x40 /* put us on the air */
! 150: #define IEOB_ATTEN 0x20 /* attention! */
! 151: #define IEOB_IENAB 0x10 /* interrupt enable */
! 152: #define IEOB_XXXXX 0x08 /* free bit */
! 153: #define IEOB_XCVRL2 0x04 /* level 2 transceiver? */
! 154: #define IEOB_BUSERR 0x02 /* bus error */
! 155: #define IEOB_INT 0x01 /* interrupt */
! 156:
! 157: #define IEOB_ADBASE 0xff000000 /* KVA base addr of 24 bit address space */
! 158:
! 159: /*
! 160: * PART 3: the 3E board
! 161: */
! 162:
! 163: /*
! 164: * not supported (yet?)
! 165: */
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