/*
   *  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
   *
   * To activate controller support, use "ide0=qd65xx"
   */
  
  /*
   * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
   * Samuel Thibault <samuel.thibault@ens-lyon.org>
   */
  
  #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/ide.h>
  #include <linux/init.h>
  #include <asm/io.h>
  
  #define DRV_NAME "qd65xx"
  
  #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 */
  
  /*
   * qd65xx_select:
   *
   * This routine is invoked to prepare for access to a given drive.
   */
  
  static void qd65xx_dev_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));
  
  	outb(drive->select | ATA_DEVICE_OBS, drive->hwif->io_ports.device_addr);
  }
  
  /*
   * 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)
  {
  	int clk = ide_vlb_clk ? ide_vlb_clk : 50;
  	u8 act_cyc, rec_cyc;
  
  	if (clk <= 33) {
  		act_cyc =  9 - IDE_IN(active_time   * clk / 1000 + 1, 2,  9);
  		rec_cyc = 15 - IDE_IN(recovery_time * clk / 1000 + 1, 0, 15);
  	} else {
  		act_cyc =  8 - IDE_IN(active_time   * clk / 1000 + 1, 1,  8);
  		rec_cyc = 18 - IDE_IN(recovery_time * clk / 1000 + 1, 3, 18);
  	}
  
  	return (rec_cyc << 4) | 0x08 | act_cyc;
  }
  
  /*
   * qd6580_compute_timing
   *
   * idem for qd6580
   */
  
  static u8 qd6580_compute_timing (int active_time, int recovery_time)
  {
  	int clk = ide_vlb_clk ? ide_vlb_clk : 50;
  	u8 act_cyc, rec_cyc;
  
  	act_cyc = 17 - IDE_IN(active_time   * clk / 1000 + 1, 2, 17);
  	rec_cyc = 15 - IDE_IN(recovery_time * clk / 1000 + 1, 2, 15);
  
  	return (rec_cyc << 4) | act_cyc;
  }
  
  /*
   * 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 *m = (char *)&drive->id[ATA_ID_PROD];
  	char model[ATA_ID_PROD_LEN];
  
  	if (*m == 0)
  		return 0;
  
  	strncpy(model, m, ATA_ID_PROD_LEN);
  	ide_fixstring(model, ATA_ID_PROD_LEN, 1); /* byte-swap */
  
  	for (p = qd65xx_timing ; p->offset != -1 ; p++) {
  		if (!strncmp(p->model, model+p->offset, 4)) {
  			printk(KERN_DEBUG "%s: listed !
  ", drive->name);
  			*active_time = p->active;
  			*recovery_time = p->recovery;
  			return 1;
  		}
  	}
  	return 0;
  }
  
  /*
   * qd_set_timing:
   *
   * records the timing
   */
  
  static void qd_set_timing (ide_drive_t *drive, u8 timing)
  {
  	unsigned long data = (unsigned long)ide_get_drivedata(drive);
  
  	data &= 0xff00;
  	data |= timing;
  	ide_set_drivedata(drive, (void *)data);
  
  	printk(KERN_DEBUG "%s: %#x
  ", drive->name, timing);
  }
  
  static void qd6500_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  {
  	u16 *id = drive->id;
  	int active_time   = 175;
  	int recovery_time = 415; /* worst case values from the dos driver */
  
  	/* FIXME: use drive->pio_mode value */
  	if (!qd_find_disk_type(drive, &active_time, &recovery_time) &&
  	    (id[ATA_ID_OLD_PIO_MODES] & 0xff) && (id[ATA_ID_FIELD_VALID] & 2) &&
  	    id[ATA_ID_EIDE_PIO] >= 240) {
  		printk(KERN_INFO "%s: PIO mode%d
  ", drive->name,
  			id[ATA_ID_OLD_PIO_MODES] & 0xff);
  		active_time = 110;
  		recovery_time = drive->id[ATA_ID_EIDE_PIO] - 120;
  	}
  
  	qd_set_timing(drive, qd6500_compute_timing(drive->hwif,
  				active_time, recovery_time));
  }
  
  static void qd6580_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  {
  	const u8 pio = drive->pio_mode - XFER_PIO_0;
  	struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
  	unsigned int cycle_time;
  	int active_time   = 175;
  	int recovery_time = 415; /* worst case values from the dos driver */
  	u8 base = (hwif->config_data & 0xff00) >> 8;
  
  	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 !
  ",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 !
  ",drive->name);
  				break;
  			default:
  				if (cycle_time >= 180) {
  					active_time = 110;
  					recovery_time = cycle_time - 120;
  				} else {
  					active_time = t->active;
  					recovery_time = cycle_time - active_time;
  				}
  		}
  		printk(KERN_INFO "%s: PIO mode%d
  ", drive->name,pio);
  	}
  
  	if (!hwif->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.
  ",
  			drive->name, hwif->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 !
  ");
  		printk(KERN_ERR "Please contact maintainers to tell about your hardware
  ");
  		printk(KERN_ERR "Assuming qd65xx is not present.
  ");
  		return 1;
  	}
  
  	return (readreg != QD_TESTVAL);
  }
  
  static void __init qd6500_init_dev(ide_drive_t *drive)
  {
  	ide_hwif_t *hwif = drive->hwif;
  	u8 base = (hwif->config_data & 0xff00) >> 8;
  	u8 config = QD_CONFIG(hwif);
  
  	ide_set_drivedata(drive, (void *)QD6500_DEF_DATA);
  }
  
  static void __init qd6580_init_dev(ide_drive_t *drive)
  {
  	ide_hwif_t *hwif = drive->hwif;
  	u16 t1, t2;
  	u8 base = (hwif->config_data & 0xff00) >> 8;
  	u8 config = QD_CONFIG(hwif);
  
  	if (hwif->host_flags & IDE_HFLAG_SINGLE) {
  		t1 = QD6580_DEF_DATA;
  		t2 = QD6580_DEF_DATA2;
  	} else
  		t2 = t1 = hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA;
  
  	ide_set_drivedata(drive, (void *)((drive->dn & 1) ? t2 : t1));
  }
  
  static const struct ide_tp_ops qd65xx_tp_ops = {
  	.exec_command		= ide_exec_command,
  	.read_status		= ide_read_status,
  	.read_altstatus		= ide_read_altstatus,
  	.write_devctl		= ide_write_devctl,
  
  	.dev_select		= qd65xx_dev_select,
  	.tf_load		= ide_tf_load,
  	.tf_read		= ide_tf_read,
  
  	.input_data		= ide_input_data,
  	.output_data		= ide_output_data,
  };
  
  static const struct ide_port_ops qd6500_port_ops = {
  	.init_dev		= qd6500_init_dev,
  	.set_pio_mode		= qd6500_set_pio_mode,
  };
  
  static const struct ide_port_ops qd6580_port_ops = {
  	.init_dev		= qd6580_init_dev,
  	.set_pio_mode		= qd6580_set_pio_mode,
  };
  
  static const struct ide_port_info qd65xx_port_info __initconst = {
  	.name			= DRV_NAME,
  	.tp_ops 		= &qd65xx_tp_ops,
  	.chipset		= ide_qd65xx,
  	.host_flags		= IDE_HFLAG_IO_32BIT |
  				  IDE_HFLAG_NO_DMA,
  	.pio_mask		= ATA_PIO4,
  };
  
  /*
   * 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)
  {
  	int rc;
  	u8 config, unit, control;
  	struct ide_port_info d = qd65xx_port_info;
  
  	config = inb(QD_CONFIG_PORT);
  
  	if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
  		return -ENODEV;
  
  	unit = ! (config & QD_CONFIG_IDE_BASEPORT);
  
  	if (unit)
  		d.host_flags |= IDE_HFLAG_QD_2ND_PORT;
  
  	switch (config & 0xf0) {
  	case QD_CONFIG_QD6500:
  		if (qd_testreg(base))
  			 return -ENODEV;	/* bad register */
  
  		if (config & QD_CONFIG_DISABLED) {
  			printk(KERN_WARNING "qd6500 is disabled !
  ");
  			return -ENODEV;
  		}
  
  		printk(KERN_NOTICE "qd6500 at %#x
  ", base);
  		printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u
  ",
  			config, QD_ID3);
  
  		d.port_ops = &qd6500_port_ops;
  		d.host_flags |= IDE_HFLAG_SINGLE;
  		break;
  	case QD_CONFIG_QD6580_A:
  	case QD_CONFIG_QD6580_B:
  		if (qd_testreg(base) || qd_testreg(base + 0x02))
  			return -ENODEV;	/* bad registers */
  
  		control = inb(QD_CONTROL_PORT);
  
  		printk(KERN_NOTICE "qd6580 at %#x
  ", base);
  		printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u
  ",
  			config, control, QD_ID3);
  
  		outb(QD_DEF_CONTR, QD_CONTROL_PORT);
  
  		d.port_ops = &qd6580_port_ops;
  		if (control & QD_CONTR_SEC_DISABLED)
  			d.host_flags |= IDE_HFLAG_SINGLE;
  
  		printk(KERN_INFO "qd6580: %s IDE board
  ",
  			(control & QD_CONTR_SEC_DISABLED) ? "single" : "dual");
  		break;
  	default:
  		return -ENODEV;
  	}
  
  	rc = ide_legacy_device_add(&d, (base << 8) | config);
  
  	if (d.host_flags & IDE_HFLAG_SINGLE)
  		return (rc == 0) ? 1 : rc;
  
  	return rc;
  }
  
  static bool probe_qd65xx;
  
  module_param_named(probe, probe_qd65xx, bool, 0);
  MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
  
  static int __init qd65xx_init(void)
  {
  	int rc1, rc2 = -ENODEV;
  
  	if (probe_qd65xx == 0)
  		return -ENODEV;
  
  	rc1 = qd_probe(0x30);
  	if (rc1)
  		rc2 = qd_probe(0xb0);
  
  	if (rc1 < 0 && rc2 < 0)
  		return -ENODEV;
  
  	return 0;
  }
  
  module_init(qd65xx_init);
  
  MODULE_AUTHOR("Samuel Thibault");
  MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
  MODULE_LICENSE("GPL");