1 /* $NetBSD: if_eireg.h,v 1.2 2001/12/21 22:33:28 bjh21 Exp $ */ 2 3 /* 4 * 2000 Ben Harris 5 * 6 * This file is in the public domain. 7 */ 8 9 /* 10 * if_eireg.h - register definitions etc for the Acorn Ether1 card 11 */ 12 13 #ifndef _IF_EIREG_H_ 14 #define _IF_EIREG_H_ 15 16 /* 17 * The card has three address spaces. The ROM is mapped into the 18 * bottom 32 bytes of SYNC address space, and contains the 19 * expansion card ID information and the Ethernet address. There is a 20 * pair of write-only registers at the start of the FAST address 21 * space. One of these performs miscellaneous control functions, and 22 * the other acts as a page selector for the board memory. The board 23 * has 64k of RAM, and 4k pages of this can be mapped at offset 0x2000 24 * in the FAST space by writing the page number to the page register. 25 * The 82586 has access to the whole of this memory and (I believe) 26 * sees it as the top 64k of its address space. 27 */ 28 29 /* Registers in the board's control space */ 30 #define EI_PAGE 0 31 #define EI_CONTROL 1 32 #define EI_CTL_RST 0x01 /* Reset */ 33 #define EI_CTL_LB 0x02 /* Loop-back */ 34 #define EI_CTL_CA 0x04 /* Channel Attention */ 35 #define EI_CTL_CLI 0x08 /* Clear Interrupt */ 36 37 /* Offset of base of memory in bus_addr_t units */ 38 #define EI_MEMOFF 0x2000 39 40 /* 41 * All addresses within board RAM are in bytes of actual RAM. RAM is 42 * 16 bits wide, and can only be accessed by word transfers 43 * (bus_space_xxx_2). 44 */ 45 #define EI_MEMSIZE 0x10000 46 #define EI_MEMBASE (0x1000000 - EI_MEMSIZE) 47 #define EI_PAGESIZE 0x1000 48 #define EI_NPAGES (EI_MEMSIZE / EI_PAGESIZE) 49 #define ei_atop(a) (((a) % EI_MEMSIZE) / EI_PAGESIZE) 50 #define ei_atopo(a) ((a) % EI_PAGESIZE) 51 52 #define EI_SCP_ADDR IE_SCP_ADDR % EI_MEMSIZE 53 54 /* 55 * The ROM on the Ether1 is a bit oddly wired, in that the interrupt 56 * line is wired up as the high-order address line, so as to allow the 57 * interrupt status bit the the first byte to reflect the actual 58 * interrupt status. 59 */ 60 61 #define EI_ROMSIZE 0x20 62 /* First eight bytes are standard extended podule ID. */ 63 #define EI_ROM_HWREV 0x08 64 #define EI_ROM_EADDR 0x09 65 #define EI_ROM_CRC 0x1c 66 67 #endif 68