Logo Search packages:      
Sourcecode: linux version File versions  Download package

ali14xx.c

/*
 *  linux/drivers/ide/legacy/ali14xx.c          Version 0.03      Feb 09, 1996
 *
 *  Copyright (C) 1996  Linus Torvalds & author (see below)
 */

/*
 * ALI M14xx chipset EIDE controller
 *
 * Works for ALI M1439/1443/1445/1487/1489 chipsets.
 *
 * Adapted from code developed by derekn@vw.ece.cmu.edu.  -ml
 * Derek's notes follow:
 *
 * I think the code should be pretty understandable,
 * but I'll be happy to (try to) answer questions.
 *
 * The critical part is in the setupDrive function.  The initRegisters
 * function doesn't seem to be necessary, but the DOS driver does it, so
 * I threw it in.
 *
 * I've only tested this on my system, which only has one disk.  I posted
 * it to comp.sys.linux.hardware, so maybe some other people will try it
 * out.
 *
 * Derek Noonburg  (derekn@ece.cmu.edu)
 * 95-sep-26
 *
 * Update 96-jul-13:
 *
 * I've since upgraded to two disks and a CD-ROM, with no trouble, and
 * I've also heard from several others who have used it successfully.
 * This driver appears to work with both the 1443/1445 and the 1487/1489
 * chipsets.  I've added support for PIO mode 4 for the 1487.  This
 * seems to work just fine on the 1443 also, although I'm not sure it's
 * advertised as supporting mode 4.  (I've been running a WDC AC21200 in
 * mode 4 for a while now with no trouble.)  -Derek
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/init.h>

#include <asm/io.h>

/* port addresses for auto-detection */
#define ALI_NUM_PORTS 4
static const int ports[ALI_NUM_PORTS] __initdata =
      { 0x074, 0x0f4, 0x034, 0x0e4 };

/* register initialization data */
typedef struct { u8 reg, data; } RegInitializer;

static const RegInitializer initData[] __initdata = {
      {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
      {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
      {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
      {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
      {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
      {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
      {0x35, 0x03}, {0x00, 0x00}
};

/* timing parameter registers for each drive */
static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = {
      {0x03, 0x26, 0x04, 0x27},     /* drive 0 */
      {0x05, 0x28, 0x06, 0x29},     /* drive 1 */
      {0x2b, 0x30, 0x2c, 0x31},     /* drive 2 */
      {0x2d, 0x32, 0x2e, 0x33},     /* drive 3 */
};

static int basePort;    /* base port address */
static int regPort;     /* port for register number */
static int dataPort;    /* port for register data */
static u8 regOn;  /* output to base port to access registers */
static u8 regOff; /* output to base port to close registers */

/*------------------------------------------------------------------------*/

/*
 * Read a controller register.
 */
static inline u8 inReg (u8 reg)
{
      outb_p(reg, regPort);
      return inb(dataPort);
}

/*
 * Write a controller register.
 */
static void outReg (u8 data, u8 reg)
{
      outb_p(reg, regPort);
      outb_p(data, dataPort);
}

static DEFINE_SPINLOCK(ali14xx_lock);

/*
 * Set PIO mode for the specified drive.
 * This function computes timing parameters
 * and sets controller registers accordingly.
 */
static void ali14xx_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
      int driveNum;
      int time1, time2;
      u8 param1, param2, param3, param4;
      unsigned long flags;
      int bus_speed = system_bus_clock();

      /* calculate timing, according to PIO mode */
      time1 = ide_pio_cycle_time(drive, pio);
      time2 = ide_pio_timings[pio].active_time;
      param3 = param1 = (time2 * bus_speed + 999) / 1000;
      param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
      if (pio < 3) {
            param3 += 8;
            param4 += 8;
      }
      printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
            drive->name, pio, time1, time2, param1, param2, param3, param4);

      /* stuff timing parameters into controller registers */
      driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
      spin_lock_irqsave(&ali14xx_lock, flags);
      outb_p(regOn, basePort);
      outReg(param1, regTab[driveNum].reg1);
      outReg(param2, regTab[driveNum].reg2);
      outReg(param3, regTab[driveNum].reg3);
      outReg(param4, regTab[driveNum].reg4);
      outb_p(regOff, basePort);
      spin_unlock_irqrestore(&ali14xx_lock, flags);
}

/*
 * Auto-detect the IDE controller port.
 */
static int __init findPort (void)
{
      int i;
      u8 t;
      unsigned long flags;

      local_irq_save(flags);
      for (i = 0; i < ALI_NUM_PORTS; ++i) {
            basePort = ports[i];
            regOff = inb(basePort);
            for (regOn = 0x30; regOn <= 0x33; ++regOn) {
                  outb_p(regOn, basePort);
                  if (inb(basePort) == regOn) {
                        regPort = basePort + 4;
                        dataPort = basePort + 8;
                        t = inReg(0) & 0xf0;
                        outb_p(regOff, basePort);
                        local_irq_restore(flags);
                        if (t != 0x50)
                              return 0;
                        return 1;  /* success */
                  }
            }
            outb_p(regOff, basePort);
      }
      local_irq_restore(flags);
      return 0;
}

/*
 * Initialize controller registers with default values.
 */
static int __init initRegisters (void) {
      const RegInitializer *p;
      u8 t;
      unsigned long flags;

      local_irq_save(flags);
      outb_p(regOn, basePort);
      for (p = initData; p->reg != 0; ++p)
            outReg(p->data, p->reg);
      outb_p(0x01, regPort);
      t = inb(regPort) & 0x01;
      outb_p(regOff, basePort);
      local_irq_restore(flags);
      return t;
}

static int __init ali14xx_probe(void)
{
      ide_hwif_t *hwif, *mate;
      static u8 idx[4] = { 0, 1, 0xff, 0xff };

      printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
                    basePort, regOn);

      /* initialize controller registers */
      if (!initRegisters()) {
            printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
            return 1;
      }

      hwif = &ide_hwifs[0];
      mate = &ide_hwifs[1];

      hwif->chipset = ide_ali14xx;
      hwif->pio_mask = ATA_PIO4;
      hwif->set_pio_mode = &ali14xx_set_pio_mode;
      hwif->mate = mate;

      mate->chipset = ide_ali14xx;
      mate->pio_mask = ATA_PIO4;
      mate->set_pio_mode = &ali14xx_set_pio_mode;
      mate->mate = hwif;
      mate->channel = 1;

      ide_device_add(idx);

      return 0;
}

int probe_ali14xx = 0;

module_param_named(probe, probe_ali14xx, bool, 0);
MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");

/* Can be called directly from ide.c. */
int __init ali14xx_init(void)
{
      if (probe_ali14xx == 0)
            goto out;

      /* auto-detect IDE controller port */
      if (findPort()) {
            if (ali14xx_probe())
                  return -ENODEV;
            return 0;
      }
      printk(KERN_ERR "ali14xx: not found.\n");
out:
      return -ENODEV;
}

#ifdef MODULE
module_init(ali14xx_init);
#endif

MODULE_AUTHOR("see local file");
MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
MODULE_LICENSE("GPL");

Generated by  Doxygen 1.6.0   Back to index