3b1emu / annotate

src/wd279x.h@b826697f411a (annotated)

src/wd279x.h

Wed, 13 Mar 2013 00:43:25 +0000

author
Philip Pemberton <philpem@philpem.me.uk>
date
Wed, 13 Mar 2013 00:43:25 +0000
changeset 134
b826697f411a
parent 111
4c85846b09cd
permissions
-rw-r--r--

[wd2010,main] WD2010 disc geometry fixes

I believe I have fixed the geometry problem with FreeBee. The geometry was set
to 17 sectors per track instead of 16, which obviously throws off addressing.
I changed it to use 16 sectors per track. However, s4diag tries to format
sector 17, so I changed the WD2010 emulation to accept any address when
formatting (since the format command doesn't actually do anything, it doesn't
matter). It is now possible to format the hard disk, initialize the file
system, and mount it. However, cpio still fails to copy the system to the hard
disk.

Author: Andrew Warkentin <andreww591 gmail com>

philpem@48 1 #ifndef _WD279X_H
philpem@48 2 #define _WD279X_H
philpem@48 3
philpem@48 4 #include <stdbool.h>
philpem@48 5 #include <stddef.h>
philpem@48 6 #include <stdint.h>
philpem@48 7 #include <stdio.h>
philpem@48 8
philpem@49 9 /// WD279x registers
philpem@49 10 typedef enum {
philpem@49 11 WD2797_REG_STATUS = 0, ///< Status register
philpem@49 12 WD2797_REG_COMMAND = 0, ///< Command register
philpem@49 13 WD2797_REG_TRACK = 1, ///< Track register
philpem@49 14 WD2797_REG_SECTOR = 2, ///< Sector register
philpem@49 15 WD2797_REG_DATA = 3 ///< Data register
philpem@49 16 } WD2797_REG;
philpem@49 17
philpem@49 18 /// WD279x emulator error codes
philpem@49 19 typedef enum {
philpem@49 20 WD2797_ERR_OK = 0, ///< Operation succeeded
philpem@49 21 WD2797_ERR_BAD_GEOM = -1, ///< Bad geometry, or image file too small
philpem@49 22 WD2797_ERR_NO_MEMORY = -2 ///< Out of memory
philpem@49 23 } WD2797_ERR;
philpem@48 24
philpem@48 25 typedef struct {
philpem@48 26 // Current track, head and sector
philpem@48 27 int track, head, sector;
philpem@111 28 // Track and sector registers
philpem@111 29 int track_reg, sector_reg;
philpem@48 30 // Geometry of current disc
philpem@48 31 int geom_secsz, geom_spt, geom_heads, geom_tracks;
philpem@79 32 // IRQ status
philpem@79 33 bool irq;
philpem@48 34 // Status of last command
philpem@48 35 uint8_t status;
philpem@48 36 // Last command uses DRQ bit?
philpem@48 37 bool cmd_has_drq;
philpem@48 38 // The last value written to the data register
philpem@48 39 uint8_t data_reg;
philpem@48 40 // Last step direction. -1 for "towards zero", 1 for "away from zero"
philpem@48 41 int last_step_dir;
philpem@48 42 // Data buffer, current DRQ pointer and length
philpem@49 43 uint8_t *data;
philpem@48 44 size_t data_pos, data_len;
philpem@48 45 // Current disc image file
philpem@48 46 FILE *disc_image;
philpem@111 47 // Write protect flag
philpem@111 48 int writeable;
philpem@111 49 // LBA at which to start writing
philpem@111 50 int write_pos;
philpem@111 51 // True if a format command is in progress
philpem@111 52 int formatting;
philpem@49 53 } WD2797_CTX;
philpem@49 54
philpem@49 55 /**
philpem@49 56 * @brief Initialise a WD2797 context.
philpem@49 57 * @param ctx WD2797 context.
philpem@49 58 *
philpem@49 59 * This must be run once when the context is created.
philpem@49 60 */
philpem@49 61 void wd2797_init(WD2797_CTX *ctx);
philpem@49 62
philpem@49 63 /**
philpem@49 64 * @brief Reset a WD2797 context.
philpem@49 65 * @param ctx WD2797 context.
philpem@49 66 *
philpem@49 67 * This should be run if the WD2797 needs to be reset (nRST line toggled).
philpem@49 68 */
philpem@49 69 void wd2797_reset(WD2797_CTX *ctx);
philpem@49 70
philpem@49 71 /**
philpem@49 72 * Deinitialise a WD2797 context.
philpem@49 73 * @param ctx WD2797 context.
philpem@49 74 */
philpem@49 75 void wd2797_done(WD2797_CTX *ctx);
philpem@49 76
philpem@49 77 /**
philpem@49 78 * @brief Read IRQ Rising Edge status. Clears Rising Edge status if it is set.
philpem@49 79 * @note No more IRQs will be sent until the Status Register is read, or a new command is written to the CR.
philpem@49 80 * @param ctx WD2797 context.
philpem@49 81 */
philpem@49 82 bool wd2797_get_irq(WD2797_CTX *ctx);
philpem@49 83
philpem@49 84 /**
philpem@49 85 * @brief Read DRQ status.
philpem@49 86 * @param ctx WD2797 context.
philpem@49 87 */
philpem@49 88 bool wd2797_get_drq(WD2797_CTX *ctx);
philpem@49 89
philpem@49 90 /**
philpem@49 91 * @brief Assign a disc image to the WD2797.
philpem@49 92 * @param ctx WD2797 context.
philpem@49 93 * @param fp Disc image file, already opened in "r+b" mode.
philpem@49 94 * @param secsz Sector size: either 128, 256, 512 or 1024.
philpem@49 95 * @param spt Sectors per track.
philpem@49 96 * @param heads Number of heads (1 or 2).
philpem@49 97 * @return Error code; WD279X_E_OK if everything worked OK.
philpem@49 98 */
philpem@111 99 WD2797_ERR wd2797_load(WD2797_CTX *ctx, FILE *fp, int secsz, int spt, int heads, int writeable);
philpem@49 100
philpem@49 101 /**
philpem@49 102 * @brief Deassign the current image file.
philpem@49 103 * @param ctx WD2797 context.
philpem@49 104 */
philpem@49 105 void wd2797_unload(WD2797_CTX *ctx);
philpem@49 106
philpem@49 107 /**
philpem@49 108 * @brief Read WD279x register.
philpem@49 109 * @param ctx WD2797 context
philpem@49 110 * @param addr Register address (0, 1, 2 or 3)
philpem@49 111 */
philpem@49 112 uint8_t wd2797_read_reg(WD2797_CTX *ctx, uint8_t addr);
philpem@49 113
philpem@49 114 /**
philpem@49 115 * @brief Write WD279X register
philpem@49 116 * @param ctx WD2797 context
philpem@49 117 * @param addr Register address (0, 1, 2 or 3)
philpem@49 118 * @param val Value to write
philpem@49 119 */
philpem@49 120 void wd2797_write_reg(WD2797_CTX *ctx, uint8_t addr, uint8_t val);
philpem@49 121
philpem@111 122 void wd2797_dma_miss(WD2797_CTX *ctx);
philpem@48 123 #endif