drivers/ide/legacy/ali14xx.c

   1 /*
   2  *  Copyright (C) 1996  Linus Torvalds & author (see below)
   3  */
   4
   5 /*
   6  * ALI M14xx chipset EIDE controller
   7  *
   8  * Works for ALI M1439/1443/1445/1487/1489 chipsets.
   9  *
  10  * Adapted from code developed by derekn@vw.ece.cmu.edu.  -ml
  11  * Derek's notes follow:
  12  *
  13  * I think the code should be pretty understandable,
  14  * but I'll be happy to (try to) answer questions.
  15  *
  16  * The critical part is in the setupDrive function.  The initRegisters
  17  * function doesn't seem to be necessary, but the DOS driver does it, so
  18  * I threw it in.
  19  *
  20  * I've only tested this on my system, which only has one disk.  I posted
  21  * it to comp.sys.linux.hardware, so maybe some other people will try it
  22  * out.
  23  *
  24  * Derek Noonburg  (derekn@ece.cmu.edu)
  25  * 95-sep-26
  26  *
  27  * Update 96-jul-13:
  28  *
  29  * I've since upgraded to two disks and a CD-ROM, with no trouble, and
  30  * I've also heard from several others who have used it successfully.
  31  * This driver appears to work with both the 1443/1445 and the 1487/1489
  32  * chipsets.  I've added support for PIO mode 4 for the 1487.  This
  33  * seems to work just fine on the 1443 also, although I'm not sure it's
  34  * advertised as supporting mode 4.  (I've been running a WDC AC21200 in
  35  * mode 4 for a while now with no trouble.)  -Derek
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/types.h>
  40 #include <linux/kernel.h>
  41 #include <linux/delay.h>
  42 #include <linux/timer.h>
  43 #include <linux/mm.h>
  44 #include <linux/ioport.h>
  45 #include <linux/blkdev.h>
  46 #include <linux/hdreg.h>
  47 #include <linux/ide.h>
  48 #include <linux/init.h>
  49
  50 #include <asm/io.h>
  51
  52 /* port addresses for auto-detection */
  53 #define ALI_NUM_PORTS 4
  54 static const int ports[ALI_NUM_PORTS] __initdata =
  55         { 0x074, 0x0f4, 0x034, 0x0e4 };
  56
  57 /* register initialization data */
  58 typedef struct { u8 reg, data; } RegInitializer;
  59
  60 static const RegInitializer initData[] __initdata = {
  61         {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
  62         {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
  63         {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
  64         {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
  65         {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
  66         {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
  67         {0x35, 0x03}, {0x00, 0x00}
  68 };
  69
  70 /* timing parameter registers for each drive */
  71 static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = {
  72         {0x03, 0x26, 0x04, 0x27},     /* drive 0 */
  73         {0x05, 0x28, 0x06, 0x29},     /* drive 1 */
  74         {0x2b, 0x30, 0x2c, 0x31},     /* drive 2 */
  75         {0x2d, 0x32, 0x2e, 0x33},     /* drive 3 */
  76 };
  77
  78 static int basePort;    /* base port address */
  79 static int regPort;     /* port for register number */
  80 static int dataPort;    /* port for register data */
  81 static u8 regOn;        /* output to base port to access registers */
  82 static u8 regOff;       /* output to base port to close registers */
  83
  84 /*------------------------------------------------------------------------*/
  85
  86 /*
  87  * Read a controller register.
  88  */
  89 static inline u8 inReg (u8 reg)
  90 {
  91         outb_p(reg, regPort);
  92         return inb(dataPort);
  93 }
  94
  95 /*
  96  * Write a controller register.
  97  */
  98 static void outReg (u8 data, u8 reg)
  99 {
 100         outb_p(reg, regPort);
 101         outb_p(data, dataPort);
 102 }
 103
 104 static DEFINE_SPINLOCK(ali14xx_lock);
 105
 106 /*
 107  * Set PIO mode for the specified drive.
 108  * This function computes timing parameters
 109  * and sets controller registers accordingly.
 110  */
 111 static void ali14xx_set_pio_mode(ide_drive_t *drive, const u8 pio)
 112 {
 113         int driveNum;
 114         int time1, time2;
 115         u8 param1, param2, param3, param4;
 116         unsigned long flags;
 117         int bus_speed = system_bus_clock();
 118
 119         /* calculate timing, according to PIO mode */
 120         time1 = ide_pio_cycle_time(drive, pio);
 121         time2 = ide_pio_timings[pio].active_time;
 122         param3 = param1 = (time2 * bus_speed + 999) / 1000;
 123         param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
 124         if (pio < 3) {
 125                 param3 += 8;
 126                 param4 += 8;
 127         }
 128         printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
 129                 drive->name, pio, time1, time2, param1, param2, param3, param4);
 130
 131         /* stuff timing parameters into controller registers */
 132         driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
 133         spin_lock_irqsave(&ali14xx_lock, flags);
 134         outb_p(regOn, basePort);
 135         outReg(param1, regTab[driveNum].reg1);
 136         outReg(param2, regTab[driveNum].reg2);
 137         outReg(param3, regTab[driveNum].reg3);
 138         outReg(param4, regTab[driveNum].reg4);
 139         outb_p(regOff, basePort);
 140         spin_unlock_irqrestore(&ali14xx_lock, flags);
 141 }
 142
 143 /*
 144  * Auto-detect the IDE controller port.
 145  */
 146 static int __init findPort (void)
 147 {
 148         int i;
 149         u8 t;
 150         unsigned long flags;
 151
 152         local_irq_save(flags);
 153         for (i = 0; i < ALI_NUM_PORTS; ++i) {
 154                 basePort = ports[i];
 155                 regOff = inb(basePort);
 156                 for (regOn = 0x30; regOn <= 0x33; ++regOn) {
 157                         outb_p(regOn, basePort);
 158                         if (inb(basePort) == regOn) {
 159                                 regPort = basePort + 4;
 160                                 dataPort = basePort + 8;
 161                                 t = inReg(0) & 0xf0;
 162                                 outb_p(regOff, basePort);
 163                                 local_irq_restore(flags);
 164                                 if (t != 0x50)
 165                                         return 0;
 166                                 return 1;  /* success */
 167                         }
 168                 }
 169                 outb_p(regOff, basePort);
 170         }
 171         local_irq_restore(flags);
 172         return 0;
 173 }
 174
 175 /*
 176  * Initialize controller registers with default values.
 177  */
 178 static int __init initRegisters (void) {
 179         const RegInitializer *p;
 180         u8 t;
 181         unsigned long flags;
 182
 183         local_irq_save(flags);
 184         outb_p(regOn, basePort);
 185         for (p = initData; p->reg != 0; ++p)
 186                 outReg(p->data, p->reg);
 187         outb_p(0x01, regPort);
 188         t = inb(regPort) & 0x01;
 189         outb_p(regOff, basePort);
 190         local_irq_restore(flags);
 191         return t;
 192 }
 193
 194 static const struct ide_port_info ali14xx_port_info = {
 195         .chipset                = ide_ali14xx,
 196         .host_flags             = IDE_HFLAG_NO_DMA | IDE_HFLAG_NO_AUTOTUNE,
 197         .pio_mask               = ATA_PIO4,
 198 };
 199
 200 static int __init ali14xx_probe(void)
 201 {
 202         static u8 idx[4] = { 0, 1, 0xff, 0xff };
 203
 204         printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
 205                           basePort, regOn);
 206
 207         /* initialize controller registers */
 208         if (!initRegisters()) {
 209                 printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
 210                 return 1;
 211         }
 212
 213         ide_hwifs[0].set_pio_mode = &ali14xx_set_pio_mode;
 214         ide_hwifs[1].set_pio_mode = &ali14xx_set_pio_mode;
 215
 216         ide_device_add(idx, &ali14xx_port_info);
 217
 218         return 0;
 219 }
 220
 221 int probe_ali14xx = 0;
 222
 223 module_param_named(probe, probe_ali14xx, bool, 0);
 224 MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
 225
 226 static int __init ali14xx_init(void)
 227 {
 228         if (probe_ali14xx == 0)
 229                 goto out;
 230
 231         /* auto-detect IDE controller port */
 232         if (findPort()) {
 233                 if (ali14xx_probe())
 234                         return -ENODEV;
 235                 return 0;
 236         }
 237         printk(KERN_ERR "ali14xx: not found.\n");
 238 out:
 239         return -ENODEV;
 240 }
 241
 242 module_init(ali14xx_init);
 243
 244 MODULE_AUTHOR("see local file");
 245 MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
 246 MODULE_LICENSE("GPL");