linux/drivers/ide/legacy/buddha.c
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   1/*
   2 *  linux/drivers/ide/legacy/buddha.c -- Amiga Buddha, Catweasel and X-Surf IDE Driver
   3 *
   4 *      Copyright (C) 1997, 2001 by Geert Uytterhoeven and others
   5 *
   6 *  This driver was written based on the specifications in README.buddha and
   7 *  the X-Surf info from Inside_XSurf.txt available at
   8 *  http://www.jschoenfeld.com
   9 *
  10 *  This file is subject to the terms and conditions of the GNU General Public
  11 *  License.  See the file COPYING in the main directory of this archive for
  12 *  more details.
  13 *
  14 *  TODO:
  15 *    - test it :-)
  16 *    - tune the timings using the speed-register
  17 */
  18
  19#include <linux/types.h>
  20#include <linux/mm.h>
  21#include <linux/interrupt.h>
  22#include <linux/blkdev.h>
  23#include <linux/hdreg.h>
  24#include <linux/zorro.h>
  25#include <linux/ide.h>
  26#include <linux/init.h>
  27
  28#include <asm/amigahw.h>
  29#include <asm/amigaints.h>
  30
  31
  32    /*
  33     *  The Buddha has 2 IDE interfaces, the Catweasel has 3, X-Surf has 2
  34     */
  35
  36#define BUDDHA_NUM_HWIFS        2
  37#define CATWEASEL_NUM_HWIFS     3
  38#define XSURF_NUM_HWIFS         2
  39
  40    /*
  41     *  Bases of the IDE interfaces (relative to the board address)
  42     */
  43
  44#define BUDDHA_BASE1    0x800
  45#define BUDDHA_BASE2    0xa00
  46#define BUDDHA_BASE3    0xc00
  47
  48#define XSURF_BASE1     0xb000 /* 2.5" Interface */
  49#define XSURF_BASE2     0xd000 /* 3.5" Interface */
  50
  51static u_int buddha_bases[CATWEASEL_NUM_HWIFS] __initdata = {
  52    BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
  53};
  54
  55static u_int xsurf_bases[XSURF_NUM_HWIFS] __initdata = {
  56     XSURF_BASE1, XSURF_BASE2
  57};
  58
  59
  60    /*
  61     *  Offsets from one of the above bases
  62     */
  63
  64#define BUDDHA_DATA     0x00
  65#define BUDDHA_ERROR    0x06            /* see err-bits */
  66#define BUDDHA_NSECTOR  0x0a            /* nr of sectors to read/write */
  67#define BUDDHA_SECTOR   0x0e            /* starting sector */
  68#define BUDDHA_LCYL     0x12            /* starting cylinder */
  69#define BUDDHA_HCYL     0x16            /* high byte of starting cyl */
  70#define BUDDHA_SELECT   0x1a            /* 101dhhhh , d=drive, hhhh=head */
  71#define BUDDHA_STATUS   0x1e            /* see status-bits */
  72#define BUDDHA_CONTROL  0x11a
  73#define XSURF_CONTROL   -1              /* X-Surf has no CS1* (Control/AltStat) */
  74
  75static int buddha_offsets[IDE_NR_PORTS] __initdata = {
  76    BUDDHA_DATA, BUDDHA_ERROR, BUDDHA_NSECTOR, BUDDHA_SECTOR, BUDDHA_LCYL,
  77    BUDDHA_HCYL, BUDDHA_SELECT, BUDDHA_STATUS, BUDDHA_CONTROL, -1
  78};
  79
  80static int xsurf_offsets[IDE_NR_PORTS] __initdata = {
  81    BUDDHA_DATA, BUDDHA_ERROR, BUDDHA_NSECTOR, BUDDHA_SECTOR, BUDDHA_LCYL,
  82    BUDDHA_HCYL, BUDDHA_SELECT, BUDDHA_STATUS, XSURF_CONTROL, -1
  83};
  84
  85    /*
  86     *  Other registers
  87     */
  88
  89#define BUDDHA_IRQ1     0xf00           /* MSB = 1, Harddisk is source of */
  90#define BUDDHA_IRQ2     0xf40           /* interrupt */
  91#define BUDDHA_IRQ3     0xf80
  92
  93#define XSURF_IRQ1      0x7e
  94#define XSURF_IRQ2      0x7e
  95
  96static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = {
  97    BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3
  98};
  99
 100static int xsurf_irqports[XSURF_NUM_HWIFS] __initdata = {
 101    XSURF_IRQ1, XSURF_IRQ2
 102};
 103
 104#define BUDDHA_IRQ_MR   0xfc0           /* master interrupt enable */
 105
 106
 107    /*
 108     *  Board information
 109     */
 110
 111typedef enum BuddhaType_Enum {
 112    BOARD_BUDDHA, BOARD_CATWEASEL, BOARD_XSURF
 113} BuddhaType;
 114
 115
 116    /*
 117     *  Check and acknowledge the interrupt status
 118     */
 119
 120static int buddha_ack_intr(ide_hwif_t *hwif)
 121{
 122    unsigned char ch;
 123
 124    ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
 125    if (!(ch & 0x80))
 126            return 0;
 127    return 1;
 128}
 129
 130static int xsurf_ack_intr(ide_hwif_t *hwif)
 131{
 132    unsigned char ch;
 133
 134    ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
 135    /* X-Surf needs a 0 written to IRQ register to ensure ISA bit A11 stays at 0 */
 136    z_writeb(0, hwif->io_ports[IDE_IRQ_OFFSET]); 
 137    if (!(ch & 0x80))
 138            return 0;
 139    return 1;
 140}
 141
 142    /*
 143     *  Probe for a Buddha or Catweasel IDE interface
 144     */
 145
 146void __init buddha_init(void)
 147{
 148        hw_regs_t hw;
 149        ide_hwif_t *hwif;
 150        int i, index;
 151
 152        struct zorro_dev *z = NULL;
 153        u_long buddha_board = 0;
 154        BuddhaType type;
 155        int buddha_num_hwifs;
 156
 157        while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 158                unsigned long board;
 159                if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
 160                        buddha_num_hwifs = BUDDHA_NUM_HWIFS;
 161                        type=BOARD_BUDDHA;
 162                } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
 163                        buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
 164                        type=BOARD_CATWEASEL;
 165                } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
 166                        buddha_num_hwifs = XSURF_NUM_HWIFS;
 167                        type=BOARD_XSURF;
 168                } else 
 169                        continue;
 170                
 171                board = z->resource.start;
 172
 173/*
 174 * FIXME: we now have selectable mmio v/s iomio transports.
 175 */
 176
 177                if(type != BOARD_XSURF) {
 178                        if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
 179                                continue;
 180                } else {
 181                        if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
 182                                continue;
 183                        if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
 184                                goto fail_base2;
 185                        if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) {
 186                                release_mem_region(board+XSURF_BASE2, 0x1000);
 187fail_base2:
 188                                release_mem_region(board+XSURF_BASE1, 0x1000);
 189                                continue;
 190                        }
 191                }         
 192                buddha_board = ZTWO_VADDR(board);
 193                
 194                /* write to BUDDHA_IRQ_MR to enable the board IRQ */
 195                /* X-Surf doesn't have this.  IRQs are always on */
 196                if (type != BOARD_XSURF)
 197                        z_writeb(0, buddha_board+BUDDHA_IRQ_MR);
 198                
 199                for(i=0;i<buddha_num_hwifs;i++) {
 200                        if(type != BOARD_XSURF) {
 201                                ide_setup_ports(&hw, (buddha_board+buddha_bases[i]),
 202                                                buddha_offsets, 0,
 203                                                (buddha_board+buddha_irqports[i]),
 204                                                buddha_ack_intr,
 205//                                              budda_iops,
 206                                                IRQ_AMIGA_PORTS);
 207                        } else {
 208                                ide_setup_ports(&hw, (buddha_board+xsurf_bases[i]),
 209                                                xsurf_offsets, 0,
 210                                                (buddha_board+xsurf_irqports[i]),
 211                                                xsurf_ack_intr,
 212//                                              xsurf_iops,
 213                                                IRQ_AMIGA_PORTS);
 214                        }       
 215
 216                        index = ide_register_hw(&hw, NULL, 1, &hwif);
 217                        if (index != -1) {
 218                                hwif->mmio = 1;
 219                                printk("ide%d: ", index);
 220                                switch(type) {
 221                                case BOARD_BUDDHA:
 222                                        printk("Buddha");
 223                                        break;
 224                                case BOARD_CATWEASEL:
 225                                        printk("Catweasel");
 226                                        break;
 227                                case BOARD_XSURF:
 228                                        printk("X-Surf");
 229                                        break;
 230                                }
 231                                printk(" IDE interface\n");         
 232                        }                     
 233                }
 234        }
 235}
 236
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