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 #include <linux/module.h>
  41 #include <linux/types.h>
  42 #include <linux/kernel.h>
  43 #include <linux/delay.h>
  44 #include <linux/timer.h>
  45 #include <linux/mm.h>
  46 #include <linux/ioport.h>
  47 #include <linux/blkdev.h>
  48 #include <linux/hdreg.h>
  49 #include <linux/ide.h>
  50 #include <linux/init.h>
  51
  52 #include <asm/io.h>
  53
  54 /* port addresses for auto-detection */
  55 #define ALI_NUM_PORTS 4
  56 static int ports[ALI_NUM_PORTS] __initdata = {0x074, 0x0f4, 0x034, 0x0e4};
  57
  58 /* register initialization data */
  59 typedef struct { u8 reg, data; } RegInitializer;
  60
  61 static RegInitializer initData[] __initdata = {
  62         {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
  63         {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
  64         {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
  65         {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
  66         {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
  67         {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
  68         {0x35, 0x03}, {0x00, 0x00}
  69 };
  70
  71 #define ALI_MAX_PIO 4
  72
  73 /* timing parameter registers for each drive */
  74 static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = {
  75         {0x03, 0x26, 0x04, 0x27},     /* drive 0 */
  76         {0x05, 0x28, 0x06, 0x29},     /* drive 1 */
  77         {0x2b, 0x30, 0x2c, 0x31},     /* drive 2 */
  78         {0x2d, 0x32, 0x2e, 0x33},     /* drive 3 */
  79 };
  80
  81 static int basePort;    /* base port address */
  82 static int regPort;     /* port for register number */
  83 static int dataPort;    /* port for register data */
  84 static u8 regOn;        /* output to base port to access registers */
  85 static u8 regOff;       /* output to base port to close registers */
  86
  87 /*------------------------------------------------------------------------*/
  88
  89 /*
  90  * Read a controller register.
  91  */
  92 static inline u8 inReg (u8 reg)
  93 {
  94         outb_p(reg, regPort);
  95         return inb(dataPort);
  96 }
  97
  98 /*
  99  * Write a controller register.
 100  */
 101 static void outReg (u8 data, u8 reg)
 102 {
 103         outb_p(reg, regPort);
 104         outb_p(data, dataPort);
 105 }
 106
 107 /*
 108  * Set PIO mode for the specified drive.
 109  * This function computes timing parameters
 110  * and sets controller registers accordingly.
 111  */
 112 static void ali14xx_tune_drive (ide_drive_t *drive, u8 pio)
 113 {
 114         int driveNum;
 115         int time1, time2;
 116         u8 param1, param2, param3, param4;
 117         unsigned long flags;
 118         int bus_speed = system_bus_clock();
 119
 120         pio = ide_get_best_pio_mode(drive, pio, ALI_MAX_PIO);
 121
 122         /* calculate timing, according to PIO mode */
 123         time1 = ide_pio_cycle_time(drive, pio);
 124         time2 = ide_pio_timings[pio].active_time;
 125         param3 = param1 = (time2 * bus_speed + 999) / 1000;
 126         param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
 127         if (pio < 3) {
 128                 param3 += 8;
 129                 param4 += 8;
 130         }
 131         printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
 132                 drive->name, pio, time1, time2, param1, param2, param3, param4);
 133
 134         /* stuff timing parameters into controller registers */
 135         driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
 136         spin_lock_irqsave(&ide_lock, flags);
 137         outb_p(regOn, basePort);
 138         outReg(param1, regTab[driveNum].reg1);
 139         outReg(param2, regTab[driveNum].reg2);
 140         outReg(param3, regTab[driveNum].reg3);
 141         outReg(param4, regTab[driveNum].reg4);
 142         outb_p(regOff, basePort);
 143         spin_unlock_irqrestore(&ide_lock, flags);
 144 }
 145
 146 /*
 147  * Auto-detect the IDE controller port.
 148  */
 149 static int __init findPort (void)
 150 {
 151         int i;
 152         u8 t;
 153         unsigned long flags;
 154
 155         local_irq_save(flags);
 156         for (i = 0; i < ALI_NUM_PORTS; ++i) {
 157                 basePort = ports[i];
 158                 regOff = inb(basePort);
 159                 for (regOn = 0x30; regOn <= 0x33; ++regOn) {
 160                         outb_p(regOn, basePort);
 161                         if (inb(basePort) == regOn) {
 162                                 regPort = basePort + 4;
 163                                 dataPort = basePort + 8;
 164                                 t = inReg(0) & 0xf0;
 165                                 outb_p(regOff, basePort);
 166                                 local_irq_restore(flags);
 167                                 if (t != 0x50)
 168                                         return 0;
 169                                 return 1;  /* success */
 170                         }
 171                 }
 172                 outb_p(regOff, basePort);
 173         }
 174         local_irq_restore(flags);
 175         return 0;
 176 }
 177
 178 /*
 179  * Initialize controller registers with default values.
 180  */
 181 static int __init initRegisters (void) {
 182         RegInitializer *p;
 183         u8 t;
 184         unsigned long flags;
 185
 186         local_irq_save(flags);
 187         outb_p(regOn, basePort);
 188         for (p = initData; p->reg != 0; ++p)
 189                 outReg(p->data, p->reg);
 190         outb_p(0x01, regPort);
 191         t = inb(regPort) & 0x01;
 192         outb_p(regOff, basePort);
 193         local_irq_restore(flags);
 194         return t;
 195 }
 196
 197 static int __init ali14xx_probe(void)
 198 {
 199         ide_hwif_t *hwif, *mate;
 200
 201         printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
 202                           basePort, regOn);
 203
 204         /* initialize controller registers */
 205         if (!initRegisters()) {
 206                 printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
 207                 return 1;
 208         }
 209
 210         hwif = &ide_hwifs[0];
 211         mate = &ide_hwifs[1];
 212
 213         hwif->chipset = ide_ali14xx;
 214         hwif->pio_mask = ATA_PIO4;
 215         hwif->tuneproc = &ali14xx_tune_drive;
 216         hwif->mate = mate;
 217
 218         mate->chipset = ide_ali14xx;
 219         mate->pio_mask = ATA_PIO4;
 220         mate->tuneproc = &ali14xx_tune_drive;
 221         mate->mate = hwif;
 222         mate->channel = 1;
 223
 224         probe_hwif_init(hwif);
 225         probe_hwif_init(mate);
 226
 227         ide_proc_register_port(hwif);
 228         ide_proc_register_port(mate);
 229
 230         return 0;
 231 }
 232
 233 int probe_ali14xx = 0;
 234
 235 module_param_named(probe, probe_ali14xx, bool, 0);
 236 MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
 237
 238 /* Can be called directly from ide.c. */
 239 int __init ali14xx_init(void)
 240 {
 241         if (probe_ali14xx == 0)
 242                 goto out;
 243
 244         /* auto-detect IDE controller port */
 245         if (findPort()) {
 246                 if (ali14xx_probe())
 247                         return -ENODEV;
 248                 return 0;
 249         }
 250         printk(KERN_ERR "ali14xx: not found.\n");
 251 out:
 252         return -ENODEV;
 253 }
 254
 255 #ifdef MODULE
 256 module_init(ali14xx_init);
 257 #endif
 258
 259 MODULE_AUTHOR("see local file");
 260 MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
 261 MODULE_LICENSE("GPL");