LXR linux/drivers/ide/buddha.c

   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
  27#include <asm/amigahw.h>
  28#include <asm/amigaints.h>
  29
  30
  31    /*
  32     *  The Buddha has 2 IDE interfaces, the Catweasel has 3, X-Surf has 2
  33     */
  34
  35#define BUDDHA_NUM_HWIFS        2
  36#define CATWEASEL_NUM_HWIFS     3
  37#define XSURF_NUM_HWIFS         2
  38
  39#define MAX_NUM_HWIFS           3
  40
  41    /*
  42     *  Bases of the IDE interfaces (relative to the board address)
  43     */
  44
  45#define BUDDHA_BASE1    0x800
  46#define BUDDHA_BASE2    0xa00
  47#define BUDDHA_BASE3    0xc00
  48
  49#define XSURF_BASE1     0xb000 /* 2.5" Interface */
  50#define XSURF_BASE2     0xd000 /* 3.5" Interface */
  51
  52static u_int buddha_bases[CATWEASEL_NUM_HWIFS] __initdata = {
  53    BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
  54};
  55
  56static u_int xsurf_bases[XSURF_NUM_HWIFS] __initdata = {
  57     XSURF_BASE1, XSURF_BASE2
  58};
  59
  60    /*
  61     *  Offsets from one of the above bases
  62     */
  63
  64#define BUDDHA_CONTROL  0x11a
  65
  66    /*
  67     *  Other registers
  68     */
  69
  70#define BUDDHA_IRQ1     0xf00           /* MSB = 1, Harddisk is source of */
  71#define BUDDHA_IRQ2     0xf40           /* interrupt */
  72#define BUDDHA_IRQ3     0xf80
  73
  74#define XSURF_IRQ1      0x7e
  75#define XSURF_IRQ2      0x7e
  76
  77static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = {
  78    BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3
  79};
  80
  81static int xsurf_irqports[XSURF_NUM_HWIFS] __initdata = {
  82    XSURF_IRQ1, XSURF_IRQ2
  83};
  84
  85#define BUDDHA_IRQ_MR   0xfc0           /* master interrupt enable */
  86
  87
  88    /*
  89     *  Board information
  90     */
  91
  92typedef enum BuddhaType_Enum {
  93    BOARD_BUDDHA, BOARD_CATWEASEL, BOARD_XSURF
  94} BuddhaType;
  95
  96static const char *buddha_board_name[] = { "Buddha", "Catweasel", "X-Surf" };
  97
  98    /*
  99     *  Check and acknowledge the interrupt status
 100     */
 101
 102static int buddha_test_irq(ide_hwif_t *hwif)
 103{
 104    unsigned char ch;
 105
 106    ch = z_readb(hwif->io_ports.irq_addr);
 107    if (!(ch & 0x80))
 108            return 0;
 109    return 1;
 110}
 111
 112static void xsurf_clear_irq(ide_drive_t *drive)
 113{
 114    /*
 115     * X-Surf needs 0 written to IRQ register to ensure ISA bit A11 stays at 0
 116     */
 117    z_writeb(0, drive->hwif->io_ports.irq_addr);
 118}
 119
 120static void __init buddha_setup_ports(struct ide_hw *hw, unsigned long base,
 121                                      unsigned long ctl, unsigned long irq_port)
 122{
 123        int i;
 124
 125        memset(hw, 0, sizeof(*hw));
 126
 127        hw->io_ports.data_addr = base;
 128
 129        for (i = 1; i < 8; i++)
 130                hw->io_ports_array[i] = base + 2 + i * 4;
 131
 132        hw->io_ports.ctl_addr = ctl;
 133        hw->io_ports.irq_addr = irq_port;
 134
 135        hw->irq = IRQ_AMIGA_PORTS;
 136}
 137
 138static const struct ide_port_ops buddha_port_ops = {
 139        .test_irq               = buddha_test_irq,
 140};
 141
 142static const struct ide_port_ops xsurf_port_ops = {
 143        .clear_irq              = xsurf_clear_irq,
 144        .test_irq               = buddha_test_irq,
 145};
 146
 147static const struct ide_port_info buddha_port_info = {
 148        .port_ops               = &buddha_port_ops,
 149        .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 150        .irq_flags              = IRQF_SHARED,
 151        .chipset                = ide_generic,
 152};
 153
 154    /*
 155     *  Probe for a Buddha or Catweasel IDE interface
 156     */
 157
 158static int __init buddha_init(void)
 159{
 160        struct zorro_dev *z = NULL;
 161        u_long buddha_board = 0;
 162        BuddhaType type;
 163        int buddha_num_hwifs, i;
 164
 165        while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 166                unsigned long board;
 167                struct ide_hw hw[MAX_NUM_HWIFS], *hws[MAX_NUM_HWIFS];
 168                struct ide_port_info d = buddha_port_info;
 169
 170                if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
 171                        buddha_num_hwifs = BUDDHA_NUM_HWIFS;
 172                        type=BOARD_BUDDHA;
 173                } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
 174                        buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
 175                        type=BOARD_CATWEASEL;
 176                } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
 177                        buddha_num_hwifs = XSURF_NUM_HWIFS;
 178                        type=BOARD_XSURF;
 179                        d.port_ops = &xsurf_port_ops;
 180                } else 
 181                        continue;
 182                
 183                board = z->resource.start;
 184
 185                if(type != BOARD_XSURF) {
 186                        if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
 187                                continue;
 188                } else {
 189                        if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
 190                                continue;
 191                        if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
 192                                goto fail_base2;
 193                        if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) {
 194                                release_mem_region(board+XSURF_BASE2, 0x1000);
 195fail_base2:
 196                                release_mem_region(board+XSURF_BASE1, 0x1000);
 197                                continue;
 198                        }
 199                }         
 200                buddha_board = ZTWO_VADDR(board);
 201                
 202                /* write to BUDDHA_IRQ_MR to enable the board IRQ */
 203                /* X-Surf doesn't have this.  IRQs are always on */
 204                if (type != BOARD_XSURF)
 205                        z_writeb(0, buddha_board+BUDDHA_IRQ_MR);
 206
 207                printk(KERN_INFO "ide: %s IDE controller\n",
 208                                 buddha_board_name[type]);
 209
 210                for (i = 0; i < buddha_num_hwifs; i++) {
 211                        unsigned long base, ctl, irq_port;
 212
 213                        if (type != BOARD_XSURF) {
 214                                base = buddha_board + buddha_bases[i];
 215                                ctl = base + BUDDHA_CONTROL;
 216                                irq_port = buddha_board + buddha_irqports[i];
 217                        } else {
 218                                base = buddha_board + xsurf_bases[i];
 219                                /* X-Surf has no CS1* (Control/AltStat) */
 220                                ctl = 0;
 221                                irq_port = buddha_board + xsurf_irqports[i];
 222                        }
 223
 224                        buddha_setup_ports(&hw[i], base, ctl, irq_port);
 225
 226                        hws[i] = &hw[i];
 227                }
 228
 229                ide_host_add(&d, hws, i, NULL);
 230        }
 231
 232        return 0;
 233}
 234
 235module_init(buddha_init);
 236
 237MODULE_LICENSE("GPL");
 238