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 /* timing parameter registers for each drive */
  72 static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = {
  73         {0x03, 0x26, 0x04, 0x27},     /* drive 0 */
  74         {0x05, 0x28, 0x06, 0x29},     /* drive 1 */
  75         {0x2b, 0x30, 0x2c, 0x31},     /* drive 2 */
  76         {0x2d, 0x32, 0x2e, 0x33},     /* drive 3 */
  77 };
  78
  79 static int basePort;    /* base port address */
  80 static int regPort;     /* port for register number */
  81 static int dataPort;    /* port for register data */
  82 static u8 regOn;        /* output to base port to access registers */
  83 static u8 regOff;       /* output to base port to close registers */
  84
  85 /*------------------------------------------------------------------------*/
  86
  87 /*
  88  * Read a controller register.
  89  */
  90 static inline u8 inReg (u8 reg)
  91 {
  92         outb_p(reg, regPort);
  93         return inb(dataPort);
  94 }
  95
  96 /*
  97  * Write a controller register.
  98  */
  99 static void outReg (u8 data, u8 reg)
 100 {
 101         outb_p(reg, regPort);
 102         outb_p(data, dataPort);
 103 }
 104
 105 /*
 106  * Set PIO mode for the specified drive.
 107  * This function computes timing parameters
 108  * and sets controller registers accordingly.
 109  */
 110 static void ali14xx_set_pio_mode(ide_drive_t *drive, const u8 pio)
 111 {
 112         int driveNum;
 113         int time1, time2;
 114         u8 param1, param2, param3, param4;
 115         unsigned long flags;
 116         int bus_speed = system_bus_clock();
 117
 118         /* calculate timing, according to PIO mode */
 119         time1 = ide_pio_cycle_time(drive, pio);
 120         time2 = ide_pio_timings[pio].active_time;
 121         param3 = param1 = (time2 * bus_speed + 999) / 1000;
 122         param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
 123         if (pio < 3) {
 124                 param3 += 8;
 125                 param4 += 8;
 126         }
 127         printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
 128                 drive->name, pio, time1, time2, param1, param2, param3, param4);
 129
 130         /* stuff timing parameters into controller registers */
 131         driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
 132         spin_lock_irqsave(&ide_lock, flags);
 133         outb_p(regOn, basePort);
 134         outReg(param1, regTab[driveNum].reg1);
 135         outReg(param2, regTab[driveNum].reg2);
 136         outReg(param3, regTab[driveNum].reg3);
 137         outReg(param4, regTab[driveNum].reg4);
 138         outb_p(regOff, basePort);
 139         spin_unlock_irqrestore(&ide_lock, flags);
 140 }
 141
 142 /*
 143  * Auto-detect the IDE controller port.
 144  */
 145 static int __init findPort (void)
 146 {
 147         int i;
 148         u8 t;
 149         unsigned long flags;
 150
 151         local_irq_save(flags);
 152         for (i = 0; i < ALI_NUM_PORTS; ++i) {
 153                 basePort = ports[i];
 154                 regOff = inb(basePort);
 155                 for (regOn = 0x30; regOn <= 0x33; ++regOn) {
 156                         outb_p(regOn, basePort);
 157                         if (inb(basePort) == regOn) {
 158                                 regPort = basePort + 4;
 159                                 dataPort = basePort + 8;
 160                                 t = inReg(0) & 0xf0;
 161                                 outb_p(regOff, basePort);
 162                                 local_irq_restore(flags);
 163                                 if (t != 0x50)
 164                                         return 0;
 165                                 return 1;  /* success */
 166                         }
 167                 }
 168                 outb_p(regOff, basePort);
 169         }
 170         local_irq_restore(flags);
 171         return 0;
 172 }
 173
 174 /*
 175  * Initialize controller registers with default values.
 176  */
 177 static int __init initRegisters (void) {
 178         RegInitializer *p;
 179         u8 t;
 180         unsigned long flags;
 181
 182         local_irq_save(flags);
 183         outb_p(regOn, basePort);
 184         for (p = initData; p->reg != 0; ++p)
 185                 outReg(p->data, p->reg);
 186         outb_p(0x01, regPort);
 187         t = inb(regPort) & 0x01;
 188         outb_p(regOff, basePort);
 189         local_irq_restore(flags);
 190         return t;
 191 }
 192
 193 static int __init ali14xx_probe(void)
 194 {
 195         ide_hwif_t *hwif, *mate;
 196
 197         printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
 198                           basePort, regOn);
 199
 200         /* initialize controller registers */
 201         if (!initRegisters()) {
 202                 printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
 203                 return 1;
 204         }
 205
 206         hwif = &ide_hwifs[0];
 207         mate = &ide_hwifs[1];
 208
 209         hwif->chipset = ide_ali14xx;
 210         hwif->pio_mask = ATA_PIO4;
 211         hwif->set_pio_mode = &ali14xx_set_pio_mode;
 212         hwif->mate = mate;
 213
 214         mate->chipset = ide_ali14xx;
 215         mate->pio_mask = ATA_PIO4;
 216         mate->set_pio_mode = &ali14xx_set_pio_mode;
 217         mate->mate = hwif;
 218         mate->channel = 1;
 219
 220         probe_hwif_init(hwif);
 221         probe_hwif_init(mate);
 222
 223         ide_proc_register_port(hwif);
 224         ide_proc_register_port(mate);
 225
 226         return 0;
 227 }
 228
 229 int probe_ali14xx = 0;
 230
 231 module_param_named(probe, probe_ali14xx, bool, 0);
 232 MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
 233
 234 /* Can be called directly from ide.c. */
 235 int __init ali14xx_init(void)
 236 {
 237         if (probe_ali14xx == 0)
 238                 goto out;
 239
 240         /* auto-detect IDE controller port */
 241         if (findPort()) {
 242                 if (ali14xx_probe())
 243                         return -ENODEV;
 244                 return 0;
 245         }
 246         printk(KERN_ERR "ali14xx: not found.\n");
 247 out:
 248         return -ENODEV;
 249 }
 250
 251 #ifdef MODULE
 252 module_init(ali14xx_init);
 253 #endif
 254
 255 MODULE_AUTHOR("see local file");
 256 MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
 257 MODULE_LICENSE("GPL");