drivers/block/ali14xx.c

   1 /*
   2  *  linux/drivers/block/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/types.h>
  43 #include <linux/kernel.h>
  44 #include <linux/delay.h>
  45 #include <linux/timer.h>
  46 #include <linux/mm.h>
  47 #include <linux/ioport.h>
  48 #include <linux/blkdev.h>
  49 #include <linux/hdreg.h>
  50 #include <linux/ide.h>
  51
  52 #include <asm/io.h>
  53
  54 #include "ide_modes.h"
  55
  56 /* port addresses for auto-detection */
  57 #define ALI_NUM_PORTS 4
  58 static int ports[ALI_NUM_PORTS] = {0x074, 0x0f4, 0x034, 0x0e4};
  59
  60 /* register initialization data */
  61 typedef struct { byte reg, data; } RegInitializer;
  62
  63 static RegInitializer initData[] = {
  64         {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
  65         {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
  66         {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
  67         {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
  68         {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
  69         {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
  70         {0x35, 0x03}, {0x00, 0x00}
  71 };
  72
  73 #define ALI_MAX_PIO 4
  74
  75 /* timing parameter registers for each drive */
  76 static struct { byte reg1, reg2, reg3, reg4; } regTab[4] = {
  77         {0x03, 0x26, 0x04, 0x27},     /* drive 0 */
  78         {0x05, 0x28, 0x06, 0x29},     /* drive 1 */
  79         {0x2b, 0x30, 0x2c, 0x31},     /* drive 2 */
  80         {0x2d, 0x32, 0x2e, 0x33},     /* drive 3 */
  81 };
  82
  83 static int basePort = 0;        /* base port address */
  84 static int regPort = 0;         /* port for register number */
  85 static int dataPort = 0;        /* port for register data */
  86 static byte regOn;      /* output to base port to access registers */
  87 static byte regOff;     /* output to base port to close registers */
  88
  89 /*------------------------------------------------------------------------*/
  90
  91 /*
  92  * Read a controller register.
  93  */
  94 static inline byte inReg (byte reg)
  95 {
  96         outb_p(reg, regPort);
  97         return inb(dataPort);
  98 }
  99
 100 /*
 101  * Write a controller register.
 102  */
 103 static void outReg (byte data, byte reg)
 104 {
 105         outb_p(reg, regPort);
 106         outb_p(data, dataPort);
 107 }
 108
 109 /*
 110  * Set PIO mode for the specified drive.
 111  * This function computes timing parameters
 112  * and sets controller registers accordingly.
 113  */
 114 static void ali14xx_tune_drive (ide_drive_t *drive, byte pio)
 115 {
 116         int driveNum;
 117         int time1, time2;
 118         byte param1, param2, param3, param4;
 119         unsigned long flags;
 120         ide_pio_data_t d;
 121         int bus_speed = ide_system_bus_speed();
 122
 123         pio = ide_get_best_pio_mode(drive, pio, ALI_MAX_PIO, &d);
 124
 125         /* calculate timing, according to PIO mode */
 126         time1 = d.cycle_time;
 127         time2 = ide_pio_timings[pio].active_time;
 128         param3 = param1 = (time2 * bus_speed + 999) / 1000;
 129         param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
 130         if (pio < 3) {
 131                 param3 += 8;
 132                 param4 += 8;
 133         }
 134         printk("%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
 135                 drive->name, pio, time1, time2, param1, param2, param3, param4);
 136
 137         /* stuff timing parameters into controller registers */
 138         driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
 139         save_flags(flags);      /* all CPUs */
 140         cli();                  /* all CPUs */
 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         restore_flags(flags);   /* all CPUs */
 148 }
 149
 150 /*
 151  * Auto-detect the IDE controller port.
 152  */
 153 static int findPort (void)
 154 {
 155         int i;
 156         byte t;
 157         unsigned long flags;
 158
 159         __save_flags(flags);    /* local CPU only */
 160         __cli();                /* local CPU only */
 161         for (i = 0; i < ALI_NUM_PORTS; ++i) {
 162                 basePort = ports[i];
 163                 regOff = inb(basePort);
 164                 for (regOn = 0x30; regOn <= 0x33; ++regOn) {
 165                         outb_p(regOn, basePort);
 166                         if (inb(basePort) == regOn) {
 167                                 regPort = basePort + 4;
 168                                 dataPort = basePort + 8;
 169                                 t = inReg(0) & 0xf0;
 170                                 outb_p(regOff, basePort);
 171                                 __restore_flags(flags); /* local CPU only */
 172                                 if (t != 0x50)
 173                                         return 0;
 174                                 return 1;  /* success */
 175                         }
 176                 }
 177                 outb_p(regOff, basePort);
 178         }
 179         __restore_flags(flags); /* local CPU only */
 180         return 0;
 181 }
 182
 183 /*
 184  * Initialize controller registers with default values.
 185  */
 186 static int initRegisters (void) {
 187         RegInitializer *p;
 188         byte t;
 189         unsigned long flags;
 190
 191         __save_flags(flags);    /* local CPU only */
 192         __cli();                /* local CPU only */
 193         outb_p(regOn, basePort);
 194         for (p = initData; p->reg != 0; ++p)
 195                 outReg(p->data, p->reg);
 196         outb_p(0x01, regPort);
 197         t = inb(regPort) & 0x01;
 198         outb_p(regOff, basePort);
 199         __restore_flags(flags); /* local CPU only */
 200         return t;
 201 }
 202
 203 void init_ali14xx (void)
 204 {
 205         /* auto-detect IDE controller port */
 206         if (!findPort()) {
 207                 printk("ali14xx: not found\n");
 208                 return;
 209         }
 210
 211         printk("ali14xx: base= 0x%03x, regOn = 0x%02x\n", basePort, regOn);
 212         ide_hwifs[0].chipset = ide_ali14xx;
 213         ide_hwifs[1].chipset = ide_ali14xx;
 214         ide_hwifs[0].tuneproc = &ali14xx_tune_drive;
 215         ide_hwifs[1].tuneproc = &ali14xx_tune_drive;
 216         ide_hwifs[0].mate = &ide_hwifs[1];
 217         ide_hwifs[1].mate = &ide_hwifs[0];
 218         ide_hwifs[1].channel = 1;
 219
 220         /* initialize controller registers */
 221         if (!initRegisters()) {
 222                 printk("ali14xx: Chip initialization failed\n");
 223                 return;
 224         }
 225 }