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qd65xx.c

/*
 *  linux/drivers/ide/legacy/qd65xx.c           Version 0.07      Sep 30, 2001
 *
 *  Copyright (C) 1996-2001  Linus Torvalds & author (see below)
 */

/*
 *  Version 0.03  Cleaned auto-tune, added probe
 *  Version 0.04  Added second channel tuning
 *  Version 0.05  Enhanced tuning ; added qd6500 support
 *  Version 0.06  Added dos driver's list
 *  Version 0.07  Second channel bug fix 
 *
 * QDI QD6500/QD6580 EIDE controller fast support
 *
 * Please set local bus speed using kernel parameter idebus
 *    for example, "idebus=33" stands for 33Mhz VLbus
 * To activate controller support, use "ide0=qd65xx"
 * To enable tuning, use "hda=autotune hdb=autotune"
 * To enable 2nd channel tuning (qd6580 only), use "hdc=autotune hdd=autotune"
 */

/*
 * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
 * Samuel Thibault <samuel.thibault@fnac.net>
 */

#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/system.h>
#include <asm/io.h>

#include "qd65xx.h"

/*
 * I/O ports are 0x30-0x31 (and 0x32-0x33 for qd6580)
 *            or 0xb0-0xb1 (and 0xb2-0xb3 for qd6580)
 *    -- qd6500 is a single IDE interface
 *    -- qd6580 is a dual IDE interface
 *
 * More research on qd6580 being done by willmore@cig.mot.com (David)
 * More Information given by Petr Soucek (petr@ryston.cz)
 * http://www.ryston.cz/petr/vlb
 */

/*
 * base: Timer1
 *
 *
 * base+0x01: Config (R/O)
 *
 * bit 0: ide baseport: 1 = 0x1f0 ; 0 = 0x170 (only useful for qd6500)
 * bit 1: qd65xx baseport: 1 = 0xb0 ; 0 = 0x30
 * bit 2: ID3: bus speed: 1 = <=33MHz ; 0 = >33MHz
 * bit 3: qd6500: 1 = disabled, 0 = enabled
 *        qd6580: 1
 * upper nibble:
 *        qd6500: 1100
 *        qd6580: either 1010 or 0101
 *
 *
 * base+0x02: Timer2 (qd6580 only)
 *
 *
 * base+0x03: Control (qd6580 only)
 *
 * bits 0-3 must always be set 1
 * bit 4 must be set 1, but is set 0 by dos driver while measuring vlb clock
 * bit 0 : 1 = Only primary port enabled : channel 0 for hda, channel 1 for hdb
 *         0 = Primary and Secondary ports enabled : channel 0 for hda & hdb
 *                                                   channel 1 for hdc & hdd
 * bit 1 : 1 = only disks on primary port
 *         0 = disks & ATAPI devices on primary port
 * bit 2-4 : always 0
 * bit 5 : status, but of what ?
 * bit 6 : always set 1 by dos driver
 * bit 7 : set 1 for non-ATAPI devices on primary port
 *    (maybe read-ahead and post-write buffer ?)
 */

static int timings[4]={-1,-1,-1,-1}; /* stores current timing for each timer */

/*
 * qd_select:
 *
 * This routine is invoked from ide.c to prepare for access to a given drive.
 */

static void qd_select (ide_drive_t *drive)
{
      u8 index = ((     (QD_TIMREG(drive)) & 0x80 ) >> 7) |
                  (QD_TIMREG(drive) & 0x02);

      if (timings[index] != QD_TIMING(drive))
            outb(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
}

/*
 * qd6500_compute_timing
 *
 * computes the timing value where
 *    lower nibble represents active time,   in count of VLB clocks
 *    upper nibble represents recovery time, in count of VLB clocks
 */

static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
{
      u8 active_cycle,recovery_cycle;

      if (system_bus_clock()<=33) {
            active_cycle =   9  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 9);
            recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 0, 15);
      } else {
            active_cycle =   8  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 1, 8);
            recovery_cycle = 18 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 3, 18);
      }

      return((recovery_cycle<<4) | 0x08 | active_cycle);
}

/*
 * qd6580_compute_timing
 *
 * idem for qd6580
 */

static u8 qd6580_compute_timing (int active_time, int recovery_time)
{
      u8 active_cycle   = 17 - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 17);
      u8 recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 2, 15);

      return((recovery_cycle<<4) | active_cycle);
}

/*
 * qd_find_disk_type
 *
 * tries to find timing from dos driver's table
 */

static int qd_find_disk_type (ide_drive_t *drive,
            int *active_time, int *recovery_time)
{
      struct qd65xx_timing_s *p;
      char model[40];

      if (!*drive->id->model) return 0;

      strncpy(model,drive->id->model,40);
      ide_fixstring(model,40,1); /* byte-swap */

      for (p = qd65xx_timing ; p->offset != -1 ; p++) {
            if (!strncmp(p->model, model+p->offset, 4)) {
                  printk(KERN_DEBUG "%s: listed !\n", drive->name);
                  *active_time = p->active;
                  *recovery_time = p->recovery;
                  return 1;
            }
      }
      return 0;
}

/*
 * qd_timing_ok:
 *
 * check whether timings don't conflict
 */

static int qd_timing_ok (ide_drive_t drives[])
{
      return (IDE_IMPLY(drives[0].present && drives[1].present,
                  IDE_IMPLY(QD_TIMREG(drives) == QD_TIMREG(drives+1),
                            QD_TIMING(drives) == QD_TIMING(drives+1))));
      /* if same timing register, must be same timing */
}

/*
 * qd_set_timing:
 *
 * records the timing, and enables selectproc as needed
 */

static void qd_set_timing (ide_drive_t *drive, u8 timing)
{
      ide_hwif_t *hwif = HWIF(drive);

      drive->drive_data &= 0xff00;
      drive->drive_data |= timing;
      if (qd_timing_ok(hwif->drives)) {
            qd_select(drive); /* selects once */
            hwif->selectproc = NULL;
      } else
            hwif->selectproc = &qd_select;

      printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
}

static void qd6500_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
      int active_time   = 175;
      int recovery_time = 415; /* worst case values from the dos driver */

      /*
       * FIXME: use "pio" value
       */
      if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)
            && drive->id->tPIO && (drive->id->field_valid & 0x02)
            && drive->id->eide_pio >= 240) {

            printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
                        drive->id->tPIO);
            active_time = 110;
            recovery_time = drive->id->eide_pio - 120;
      }

      qd_set_timing(drive, qd6500_compute_timing(HWIF(drive), active_time, recovery_time));
}

static void qd6580_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
      int base = HWIF(drive)->select_data;
      unsigned int cycle_time;
      int active_time   = 175;
      int recovery_time = 415; /* worst case values from the dos driver */

      if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
            cycle_time = ide_pio_cycle_time(drive, pio);

            switch (pio) {
                  case 0: break;
                  case 3:
                        if (cycle_time >= 110) {
                              active_time = 86;
                              recovery_time = cycle_time - 102;
                        } else
                              printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
                        break;
                  case 4:
                        if (cycle_time >= 69) {
                              active_time = 70;
                              recovery_time = cycle_time - 61;
                        } else
                              printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
                        break;
                  default:
                        if (cycle_time >= 180) {
                              active_time = 110;
                              recovery_time = cycle_time - 120;
                        } else {
                              active_time = ide_pio_timings[pio].active_time;
                              recovery_time = cycle_time - active_time;
                        }
            }
            printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
      }

      if (!HWIF(drive)->channel && drive->media != ide_disk) {
            outb(0x5f, QD_CONTROL_PORT);
            printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
                  "and post-write buffer on %s.\n",
                  drive->name, HWIF(drive)->name);
      }

      qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
}

/*
 * qd_testreg
 *
 * tests if the given port is a register
 */

static int __init qd_testreg(int port)
{
      unsigned long flags;
      u8 savereg, readreg;

      local_irq_save(flags);
      savereg = inb_p(port);
      outb_p(QD_TESTVAL, port);     /* safe value */
      readreg = inb_p(port);
      outb(savereg, port);
      local_irq_restore(flags);

      if (savereg == QD_TESTVAL) {
            printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
            printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
            printk(KERN_ERR "Assuming qd65xx is not present.\n");
            return 1;
      }

      return (readreg != QD_TESTVAL);
}

/*
 * qd_setup:
 *
 * called to setup an ata channel : adjusts attributes & links for tuning
 */

static void __init qd_setup(ide_hwif_t *hwif, int base, int config,
                      unsigned int data0, unsigned int data1)
{
      hwif->chipset = ide_qd65xx;
      hwif->channel = hwif->index;
      hwif->select_data = base;
      hwif->config_data = config;
      hwif->drives[0].drive_data = data0;
      hwif->drives[1].drive_data = data1;
      hwif->drives[0].io_32bit =
      hwif->drives[1].io_32bit = 1;
      hwif->pio_mask = ATA_PIO4;
}

/*
 * qd_unsetup:
 *
 * called to unsetup an ata channel : back to default values, unlinks tuning
 */
/*
static void __exit qd_unsetup(ide_hwif_t *hwif)
{
      u8 config = hwif->config_data;
      int base = hwif->select_data;
      void *set_pio_mode = (void *)hwif->set_pio_mode;

      if (hwif->chipset != ide_qd65xx)
            return;

      printk(KERN_NOTICE "%s: back to defaults\n", hwif->name);

      hwif->selectproc = NULL;
      hwif->set_pio_mode = NULL;

      if (set_pio_mode == (void *)qd6500_set_pio_mode) {
            // will do it for both
            outb(QD6500_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
      } else if (set_pio_mode == (void *)qd6580_set_pio_mode) {
            if (QD_CONTROL(hwif) & QD_CONTR_SEC_DISABLED) {
                  outb(QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
                  outb(QD6580_DEF_DATA2, QD_TIMREG(&hwif->drives[1]));
            } else {
                  outb(hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
            }
      } else {
            printk(KERN_WARNING "Unknown qd65xx tuning fonction !\n");
            printk(KERN_WARNING "keeping settings !\n");
      }
}
*/

/*
 * qd_probe:
 *
 * looks at the specified baseport, and if qd found, registers & initialises it
 * return 1 if another qd may be probed
 */

static int __init qd_probe(int base)
{
      ide_hwif_t *hwif;
      u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
      u8 config;
      u8 unit;

      config = inb(QD_CONFIG_PORT);

      if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
            return 1;

      unit = ! (config & QD_CONFIG_IDE_BASEPORT);

      if ((config & 0xf0) == QD_CONFIG_QD6500) {

            if (qd_testreg(base)) return 1;           /* bad register */

            /* qd6500 found */

            hwif = &ide_hwifs[unit];
            printk(KERN_NOTICE "%s: qd6500 at %#x\n", hwif->name, base);
            printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
                  config, QD_ID3);
            
            if (config & QD_CONFIG_DISABLED) {
                  printk(KERN_WARNING "qd6500 is disabled !\n");
                  return 1;
            }

            qd_setup(hwif, base, config, QD6500_DEF_DATA, QD6500_DEF_DATA);

            hwif->set_pio_mode = &qd6500_set_pio_mode;

            idx[0] = unit;

            ide_device_add(idx);

            return 1;
      }

      if (((config & 0xf0) == QD_CONFIG_QD6580_A) ||
          ((config & 0xf0) == QD_CONFIG_QD6580_B)) {

            u8 control;

            if (qd_testreg(base) || qd_testreg(base+0x02)) return 1;
                  /* bad registers */

            /* qd6580 found */

            control = inb(QD_CONTROL_PORT);

            printk(KERN_NOTICE "qd6580 at %#x\n", base);
            printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
                  config, control, QD_ID3);

            if (control & QD_CONTR_SEC_DISABLED) {
                  /* secondary disabled */

                  hwif = &ide_hwifs[unit];
                  printk(KERN_INFO "%s: qd6580: single IDE board\n",
                               hwif->name);
                  qd_setup(hwif, base, config | (control << 8),
                         QD6580_DEF_DATA, QD6580_DEF_DATA2);

                  hwif->set_pio_mode = &qd6580_set_pio_mode;

                  idx[0] = unit;

                  ide_device_add(idx);

                  outb(QD_DEF_CONTR, QD_CONTROL_PORT);

                  return 1;
            } else {
                  ide_hwif_t *mate;

                  hwif = &ide_hwifs[0];
                  mate = &ide_hwifs[1];
                  /* secondary enabled */
                  printk(KERN_INFO "%s&%s: qd6580: dual IDE board\n",
                              hwif->name, mate->name);

                  qd_setup(hwif, base, config | (control << 8),
                         QD6580_DEF_DATA, QD6580_DEF_DATA);

                  hwif->set_pio_mode = &qd6580_set_pio_mode;

                  qd_setup(mate, base, config | (control << 8),
                         QD6580_DEF_DATA2, QD6580_DEF_DATA2);

                  mate->set_pio_mode = &qd6580_set_pio_mode;

                  idx[0] = 0;
                  idx[1] = 1;

                  ide_device_add(idx);

                  outb(QD_DEF_CONTR, QD_CONTROL_PORT);

                  return 0; /* no other qd65xx possible */
            }
      }
      /* no qd65xx found */
      return 1;
}

int probe_qd65xx = 0;

module_param_named(probe, probe_qd65xx, bool, 0);
MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");

/* Can be called directly from ide.c. */
int __init qd65xx_init(void)
{
      if (probe_qd65xx == 0)
            return -ENODEV;

      if (qd_probe(0x30))
            qd_probe(0xb0);
      if (ide_hwifs[0].chipset != ide_qd65xx &&
          ide_hwifs[1].chipset != ide_qd65xx)
            return -ENODEV;
      return 0;
}

#ifdef MODULE
module_init(qd65xx_init);
#endif

MODULE_AUTHOR("Samuel Thibault");
MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
MODULE_LICENSE("GPL");

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