1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _LINUX_FDREG_H 3 #define _LINUX_FDREG_H 4 /* 5 * This file contains some defines for the floppy disk controller. 6 * Various sources. Mostly "IBM Microcomputers: A Programmers 7 * Handbook", Sanches and Canton. 8 */ 9 10 /* 82077's auxiliary status registers A & B (R) */ 11 #define FD_SRA 0 12 #define FD_SRB 1 13 14 /* Digital Output Register */ 15 #define FD_DOR 2 16 17 /* 82077's tape drive register (R/W) */ 18 #define FD_TDR 3 19 20 /* 82077's data rate select register (W) */ 21 #define FD_DSR 4 22 23 /* Fd controller regs. S&C, about page 340 */ 24 #define FD_STATUS 4 25 #define FD_DATA 5 26 27 /* Digital Input Register (read) */ 28 #define FD_DIR 7 29 30 /* Diskette Control Register (write)*/ 31 #define FD_DCR 7 32 33 /* Bits of main status register */ 34 #define STATUS_BUSYMASK 0x0F /* drive busy mask */ 35 #define STATUS_BUSY 0x10 /* FDC busy */ 36 #define STATUS_DMA 0x20 /* 0- DMA mode */ 37 #define STATUS_DIR 0x40 /* 0- cpu->fdc */ 38 #define STATUS_READY 0x80 /* Data reg ready */ 39 40 /* Bits of FD_ST0 */ 41 #define ST0_DS 0x03 /* drive select mask */ 42 #define ST0_HA 0x04 /* Head (Address) */ 43 #define ST0_NR 0x08 /* Not Ready */ 44 #define ST0_ECE 0x10 /* Equipment check error */ 45 #define ST0_SE 0x20 /* Seek end */ 46 #define ST0_INTR 0xC0 /* Interrupt code mask */ 47 48 /* Bits of FD_ST1 */ 49 #define ST1_MAM 0x01 /* Missing Address Mark */ 50 #define ST1_WP 0x02 /* Write Protect */ 51 #define ST1_ND 0x04 /* No Data - unreadable */ 52 #define ST1_OR 0x10 /* OverRun */ 53 #define ST1_CRC 0x20 /* CRC error in data or addr */ 54 #define ST1_EOC 0x80 /* End Of Cylinder */ 55 56 /* Bits of FD_ST2 */ 57 #define ST2_MAM 0x01 /* Missing Address Mark (again) */ 58 #define ST2_BC 0x02 /* Bad Cylinder */ 59 #define ST2_SNS 0x04 /* Scan Not Satisfied */ 60 #define ST2_SEH 0x08 /* Scan Equal Hit */ 61 #define ST2_WC 0x10 /* Wrong Cylinder */ 62 #define ST2_CRC 0x20 /* CRC error in data field */ 63 #define ST2_CM 0x40 /* Control Mark = deleted */ 64 65 /* Bits of FD_ST3 */ 66 #define ST3_HA 0x04 /* Head (Address) */ 67 #define ST3_DS 0x08 /* drive is double-sided */ 68 #define ST3_TZ 0x10 /* Track Zero signal (1=track 0) */ 69 #define ST3_RY 0x20 /* drive is ready */ 70 #define ST3_WP 0x40 /* Write Protect */ 71 #define ST3_FT 0x80 /* Drive Fault */ 72 73 /* Values for FD_COMMAND */ 74 #define FD_RECALIBRATE 0x07 /* move to track 0 */ 75 #define FD_SEEK 0x0F /* seek track */ 76 #define FD_READ 0xE6 /* read with MT, MFM, SKip deleted */ 77 #define FD_WRITE 0xC5 /* write with MT, MFM */ 78 #define FD_SENSEI 0x08 /* Sense Interrupt Status */ 79 #define FD_SPECIFY 0x03 /* specify HUT etc */ 80 #define FD_FORMAT 0x4D /* format one track */ 81 #define FD_VERSION 0x10 /* get version code */ 82 #define FD_CONFIGURE 0x13 /* configure FIFO operation */ 83 #define FD_PERPENDICULAR 0x12 /* perpendicular r/w mode */ 84 #define FD_GETSTATUS 0x04 /* read ST3 */ 85 #define FD_DUMPREGS 0x0E /* dump the contents of the fdc regs */ 86 #define FD_READID 0xEA /* prints the header of a sector */ 87 #define FD_UNLOCK 0x14 /* Fifo config unlock */ 88 #define FD_LOCK 0x94 /* Fifo config lock */ 89 #define FD_RSEEK_OUT 0x8f /* seek out (i.e. to lower tracks) */ 90 #define FD_RSEEK_IN 0xcf /* seek in (i.e. to higher tracks) */ 91 92 /* the following commands are new in the 82078. They are not used in the 93 * floppy driver, except the first three. These commands may be useful for apps 94 * which use the FDRAWCMD interface. For doc, get the 82078 spec sheets at 95 * http://www.intel.com/design/archives/periphrl/docs/29046803.htm */ 96 97 #define FD_PARTID 0x18 /* part id ("extended" version cmd) */ 98 #define FD_SAVE 0x2e /* save fdc regs for later restore */ 99 #define FD_DRIVESPEC 0x8e /* drive specification: Access to the 100 * 2 Mbps data transfer rate for tape 101 * drives */ 102 103 #define FD_RESTORE 0x4e /* later restore */ 104 #define FD_POWERDOWN 0x27 /* configure FDC's powersave features */ 105 #define FD_FORMAT_N_WRITE 0xef /* format and write in one go. */ 106 #define FD_OPTION 0x33 /* ISO format (which is a clean way to 107 * pack more sectors on a track) */ 108 109 /* DMA commands */ 110 #define DMA_READ 0x46 111 #define DMA_WRITE 0x4A 112 113 /* FDC version return types */ 114 #define FDC_NONE 0x00 115 #define FDC_UNKNOWN 0x10 /* DO NOT USE THIS TYPE EXCEPT IF IDENTIFICATION 116 FAILS EARLY */ 117 #define FDC_8272A 0x20 /* Intel 8272a, NEC 765 */ 118 #define FDC_765ED 0x30 /* Non-Intel 1MB-compatible FDC, can't detect */ 119 #define FDC_82072 0x40 /* Intel 82072; 8272a + FIFO + DUMPREGS */ 120 #define FDC_82072A 0x45 /* 82072A (on Sparcs) */ 121 #define FDC_82077_ORIG 0x51 /* Original version of 82077AA, sans LOCK */ 122 #define FDC_82077 0x52 /* 82077AA-1 */ 123 #define FDC_82078_UNKN 0x5f /* Unknown 82078 variant */ 124 #define FDC_82078 0x60 /* 44pin 82078 or 64pin 82078SL */ 125 #define FDC_82078_1 0x61 /* 82078-1 (2Mbps fdc) */ 126 #define FDC_S82078B 0x62 /* S82078B (first seen on Adaptec AVA-2825 VLB 127 * SCSI/EIDE/Floppy controller) */ 128 #define FDC_87306 0x63 /* National Semiconductor PC 87306 */ 129 130 /* 131 * Beware: the fdc type list is roughly sorted by increasing features. 132 * Presence of features is tested by comparing the FDC version id with the 133 * "oldest" version that has the needed feature. 134 * If during FDC detection, an obscure test fails late in the sequence, don't 135 * assign FDC_UNKNOWN. Else the FDC will be treated as a dumb 8272a, or worse. 136 * This is especially true if the tests are unneeded. 137 */ 138 139 #define FD_RESET_DELAY 20 140 #endif 141