drivers/ide/legacy/ali14xx.c

   1 /*
   2  *  linux/drivers/ide/legacy/ali14xx.c          Version 0.03    Feb 09, 1996
   3  *
   4  *  Copyright (C) 1996  Linus Torvalds & author (see below)
   5  */
   6
   7 /*
   8  * ALI M14xx chipset EIDE controller
   9  *
  10  * Works for ALI M1439/1443/1445/1487/1489 chipsets.
  11  *
  12  * Adapted from code developed by derekn@vw.ece.cmu.edu.  -ml
  13  * Derek's notes follow:
  14  *
  15  * I think the code should be pretty understandable,
  16  * but I'll be happy to (try to) answer questions.
  17  *
  18  * The critical part is in the setupDrive function.  The initRegisters
  19  * function doesn't seem to be necessary, but the DOS driver does it, so
  20  * I threw it in.
  21  *
  22  * I've only tested this on my system, which only has one disk.  I posted
  23  * it to comp.sys.linux.hardware, so maybe some other people will try it
  24  * out.
  25  *
  26  * Derek Noonburg  (derekn@ece.cmu.edu)
  27  * 95-sep-26
  28  *
  29  * Update 96-jul-13:
  30  *
  31  * I've since upgraded to two disks and a CD-ROM, with no trouble, and
  32  * I've also heard from several others who have used it successfully.
  33  * This driver appears to work with both the 1443/1445 and the 1487/1489
  34  * chipsets.  I've added support for PIO mode 4 for the 1487.  This
  35  * seems to work just fine on the 1443 also, although I'm not sure it's
  36  * advertised as supporting mode 4.  (I've been running a WDC AC21200 in
  37  * mode 4 for a while now with no trouble.)  -Derek
  38  */
  39
  40 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
  41
  42 #include <linux/module.h>
  43 #include <linux/config.h>
  44 #include <linux/types.h>
  45 #include <linux/kernel.h>
  46 #include <linux/delay.h>
  47 #include <linux/timer.h>
  48 #include <linux/mm.h>
  49 #include <linux/ioport.h>
  50 #include <linux/blkdev.h>
  51 #include <linux/hdreg.h>
  52 #include <linux/ide.h>
  53 #include <linux/init.h>
  54
  55 #include <asm/io.h>
  56
  57 /* port addresses for auto-detection */
  58 #define ALI_NUM_PORTS 4
  59 static int ports[ALI_NUM_PORTS] __initdata = {0x074, 0x0f4, 0x034, 0x0e4};
  60
  61 /* register initialization data */
  62 typedef struct { u8 reg, data; } RegInitializer;
  63
  64 static RegInitializer initData[] __initdata = {
  65         {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
  66         {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
  67         {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
  68         {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
  69         {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
  70         {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
  71         {0x35, 0x03}, {0x00, 0x00}
  72 };
  73
  74 #define ALI_MAX_PIO 4
  75
  76 /* timing parameter registers for each drive */
  77 static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = {
  78         {0x03, 0x26, 0x04, 0x27},     /* drive 0 */
  79         {0x05, 0x28, 0x06, 0x29},     /* drive 1 */
  80         {0x2b, 0x30, 0x2c, 0x31},     /* drive 2 */
  81         {0x2d, 0x32, 0x2e, 0x33},     /* drive 3 */
  82 };
  83
  84 static int basePort;    /* base port address */
  85 static int regPort;     /* port for register number */
  86 static int dataPort;    /* port for register data */
  87 static u8 regOn;        /* output to base port to access registers */
  88 static u8 regOff;       /* output to base port to close registers */
  89
  90 /*------------------------------------------------------------------------*/
  91
  92 /*
  93  * Read a controller register.
  94  */
  95 static inline u8 inReg (u8 reg)
  96 {
  97         outb_p(reg, regPort);
  98         return inb(dataPort);
  99 }
 100
 101 /*
 102  * Write a controller register.
 103  */
 104 static void outReg (u8 data, u8 reg)
 105 {
 106         outb_p(reg, regPort);
 107         outb_p(data, dataPort);
 108 }
 109
 110 /*
 111  * Set PIO mode for the specified drive.
 112  * This function computes timing parameters
 113  * and sets controller registers accordingly.
 114  */
 115 static void ali14xx_tune_drive (ide_drive_t *drive, u8 pio)
 116 {
 117         int driveNum;
 118         int time1, time2;
 119         u8 param1, param2, param3, param4;
 120         unsigned long flags;
 121         ide_pio_data_t d;
 122         int bus_speed = system_bus_clock();
 123
 124         pio = ide_get_best_pio_mode(drive, pio, ALI_MAX_PIO, &d);
 125
 126         /* calculate timing, according to PIO mode */
 127         time1 = d.cycle_time;
 128         time2 = ide_pio_timings[pio].active_time;
 129         param3 = param1 = (time2 * bus_speed + 999) / 1000;
 130         param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
 131         if (pio < 3) {
 132                 param3 += 8;
 133                 param4 += 8;
 134         }
 135         printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
 136                 drive->name, pio, time1, time2, param1, param2, param3, param4);
 137
 138         /* stuff timing parameters into controller registers */
 139         driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
 140         spin_lock_irqsave(&ide_lock, flags);
 141         outb_p(regOn, basePort);
 142         outReg(param1, regTab[driveNum].reg1);
 143         outReg(param2, regTab[driveNum].reg2);
 144         outReg(param3, regTab[driveNum].reg3);
 145         outReg(param4, regTab[driveNum].reg4);
 146         outb_p(regOff, basePort);
 147         spin_unlock_irqrestore(&ide_lock, flags);
 148 }
 149
 150 /*
 151  * Auto-detect the IDE controller port.
 152  */
 153 static int __init findPort (void)
 154 {
 155         int i;
 156         u8 t;
 157         unsigned long flags;
 158
 159         local_irq_save(flags);
 160         for (i = 0; i < ALI_NUM_PORTS; ++i) {
 161                 basePort = ports[i];
 162                 regOff = inb(basePort);
 163                 for (regOn = 0x30; regOn <= 0x33; ++regOn) {
 164                         outb_p(regOn, basePort);
 165                         if (inb(basePort) == regOn) {
 166                                 regPort = basePort + 4;
 167                                 dataPort = basePort + 8;
 168                                 t = inReg(0) & 0xf0;
 169                                 outb_p(regOff, basePort);
 170                                 local_irq_restore(flags);
 171                                 if (t != 0x50)
 172                                         return 0;
 173                                 return 1;  /* success */
 174                         }
 175                 }
 176                 outb_p(regOff, basePort);
 177         }
 178         local_irq_restore(flags);
 179         return 0;
 180 }
 181
 182 /*
 183  * Initialize controller registers with default values.
 184  */
 185 static int __init initRegisters (void) {
 186         RegInitializer *p;
 187         u8 t;
 188         unsigned long flags;
 189
 190         local_irq_save(flags);
 191         outb_p(regOn, basePort);
 192         for (p = initData; p->reg != 0; ++p)
 193                 outReg(p->data, p->reg);
 194         outb_p(0x01, regPort);
 195         t = inb(regPort) & 0x01;
 196         outb_p(regOff, basePort);
 197         local_irq_restore(flags);
 198         return t;
 199 }
 200
 201 static int __init ali14xx_probe(void)
 202 {
 203         ide_hwif_t *hwif, *mate;
 204
 205         printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
 206                           basePort, regOn);
 207
 208         /* initialize controller registers */
 209         if (!initRegisters()) {
 210                 printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
 211                 return 1;
 212         }
 213
 214         hwif = &ide_hwifs[0];
 215         mate = &ide_hwifs[1];
 216
 217         hwif->chipset = ide_ali14xx;
 218         hwif->tuneproc = &ali14xx_tune_drive;
 219         hwif->mate = mate;
 220
 221         mate->chipset = ide_ali14xx;
 222         mate->tuneproc = &ali14xx_tune_drive;
 223         mate->mate = hwif;
 224         mate->channel = 1;
 225
 226         probe_hwif_init(hwif);
 227         probe_hwif_init(mate);
 228
 229         create_proc_ide_interfaces();
 230
 231         return 0;
 232 }
 233
 234 /* Can be called directly from ide.c. */
 235 int __init ali14xx_init(void)
 236 {
 237         /* auto-detect IDE controller port */
 238         if (findPort()) {
 239                 if (ali14xx_probe())
 240                         return -ENODEV;
 241                 return 0;
 242         }
 243         printk(KERN_ERR "ali14xx: not found.\n");
 244         return -ENODEV;
 245 }
 246
 247 #ifdef MODULE
 248 module_init(ali14xx_init);
 249 #endif
 250
 251 MODULE_AUTHOR("see local file");
 252 MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
 253 MODULE_LICENSE("GPL");