linux/drivers/ide/buddha.c
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   1/*
   2 *  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/zorro.h>
  24#include <linux/ide.h>
  25#include <linux/init.h>
  26#include <linux/module.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#define MAX_NUM_HWIFS           3
  41
  42    /*
  43     *  Bases of the IDE interfaces (relative to the board address)
  44     */
  45
  46#define BUDDHA_BASE1    0x800
  47#define BUDDHA_BASE2    0xa00
  48#define BUDDHA_BASE3    0xc00
  49
  50#define XSURF_BASE1     0xb000 /* 2.5" Interface */
  51#define XSURF_BASE2     0xd000 /* 3.5" Interface */
  52
  53static u_int buddha_bases[CATWEASEL_NUM_HWIFS] __initdata = {
  54    BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
  55};
  56
  57static u_int xsurf_bases[XSURF_NUM_HWIFS] __initdata = {
  58     XSURF_BASE1, XSURF_BASE2
  59};
  60
  61    /*
  62     *  Offsets from one of the above bases
  63     */
  64
  65#define BUDDHA_CONTROL  0x11a
  66
  67    /*
  68     *  Other registers
  69     */
  70
  71#define BUDDHA_IRQ1     0xf00           /* MSB = 1, Harddisk is source of */
  72#define BUDDHA_IRQ2     0xf40           /* interrupt */
  73#define BUDDHA_IRQ3     0xf80
  74
  75#define XSURF_IRQ1      0x7e
  76#define XSURF_IRQ2      0x7e
  77
  78static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = {
  79    BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3
  80};
  81
  82static int xsurf_irqports[XSURF_NUM_HWIFS] __initdata = {
  83    XSURF_IRQ1, XSURF_IRQ2
  84};
  85
  86#define BUDDHA_IRQ_MR   0xfc0           /* master interrupt enable */
  87
  88
  89    /*
  90     *  Board information
  91     */
  92
  93typedef enum BuddhaType_Enum {
  94    BOARD_BUDDHA, BOARD_CATWEASEL, BOARD_XSURF
  95} BuddhaType;
  96
  97static const char *buddha_board_name[] = { "Buddha", "Catweasel", "X-Surf" };
  98
  99    /*
 100     *  Check and acknowledge the interrupt status
 101     */
 102
 103static int buddha_test_irq(ide_hwif_t *hwif)
 104{
 105    unsigned char ch;
 106
 107    ch = z_readb(hwif->io_ports.irq_addr);
 108    if (!(ch & 0x80))
 109            return 0;
 110    return 1;
 111}
 112
 113static void xsurf_clear_irq(ide_drive_t *drive)
 114{
 115    /*
 116     * X-Surf needs 0 written to IRQ register to ensure ISA bit A11 stays at 0
 117     */
 118    z_writeb(0, drive->hwif->io_ports.irq_addr);
 119}
 120
 121static void __init buddha_setup_ports(struct ide_hw *hw, unsigned long base,
 122                                      unsigned long ctl, unsigned long irq_port)
 123{
 124        int i;
 125
 126        memset(hw, 0, sizeof(*hw));
 127
 128        hw->io_ports.data_addr = base;
 129
 130        for (i = 1; i < 8; i++)
 131                hw->io_ports_array[i] = base + 2 + i * 4;
 132
 133        hw->io_ports.ctl_addr = ctl;
 134        hw->io_ports.irq_addr = irq_port;
 135
 136        hw->irq = IRQ_AMIGA_PORTS;
 137}
 138
 139static const struct ide_port_ops buddha_port_ops = {
 140        .test_irq               = buddha_test_irq,
 141};
 142
 143static const struct ide_port_ops xsurf_port_ops = {
 144        .clear_irq              = xsurf_clear_irq,
 145        .test_irq               = buddha_test_irq,
 146};
 147
 148static const struct ide_port_info buddha_port_info = {
 149        .port_ops               = &buddha_port_ops,
 150        .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 151        .irq_flags              = IRQF_SHARED,
 152        .chipset                = ide_generic,
 153};
 154
 155    /*
 156     *  Probe for a Buddha or Catweasel IDE interface
 157     */
 158
 159static int __init buddha_init(void)
 160{
 161        struct zorro_dev *z = NULL;
 162        u_long buddha_board = 0;
 163        BuddhaType type;
 164        int buddha_num_hwifs, i;
 165
 166        while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 167                unsigned long board;
 168                struct ide_hw hw[MAX_NUM_HWIFS], *hws[MAX_NUM_HWIFS];
 169                struct ide_port_info d = buddha_port_info;
 170
 171                if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
 172                        buddha_num_hwifs = BUDDHA_NUM_HWIFS;
 173                        type=BOARD_BUDDHA;
 174                } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
 175                        buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
 176                        type=BOARD_CATWEASEL;
 177                } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
 178                        buddha_num_hwifs = XSURF_NUM_HWIFS;
 179                        type=BOARD_XSURF;
 180                        d.port_ops = &xsurf_port_ops;
 181                } else 
 182                        continue;
 183                
 184                board = z->resource.start;
 185
 186                if(type != BOARD_XSURF) {
 187                        if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
 188                                continue;
 189                } else {
 190                        if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
 191                                continue;
 192                        if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
 193                                goto fail_base2;
 194                        if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) {
 195                                release_mem_region(board+XSURF_BASE2, 0x1000);
 196fail_base2:
 197                                release_mem_region(board+XSURF_BASE1, 0x1000);
 198                                continue;
 199                        }
 200                }         
 201                buddha_board = ZTWO_VADDR(board);
 202                
 203                /* write to BUDDHA_IRQ_MR to enable the board IRQ */
 204                /* X-Surf doesn't have this.  IRQs are always on */
 205                if (type != BOARD_XSURF)
 206                        z_writeb(0, buddha_board+BUDDHA_IRQ_MR);
 207
 208                printk(KERN_INFO "ide: %s IDE controller\n",
 209                                 buddha_board_name[type]);
 210
 211                for (i = 0; i < buddha_num_hwifs; i++) {
 212                        unsigned long base, ctl, irq_port;
 213
 214                        if (type != BOARD_XSURF) {
 215                                base = buddha_board + buddha_bases[i];
 216                                ctl = base + BUDDHA_CONTROL;
 217                                irq_port = buddha_board + buddha_irqports[i];
 218                        } else {
 219                                base = buddha_board + xsurf_bases[i];
 220                                /* X-Surf has no CS1* (Control/AltStat) */
 221                                ctl = 0;
 222                                irq_port = buddha_board + xsurf_irqports[i];
 223                        }
 224
 225                        buddha_setup_ports(&hw[i], base, ctl, irq_port);
 226
 227                        hws[i] = &hw[i];
 228                }
 229
 230                ide_host_add(&d, hws, i, NULL);
 231        }
 232
 233        return 0;
 234}
 235
 236module_init(buddha_init);
 237
 238MODULE_LICENSE("GPL");
 239
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