/*
   * pata_cypress.c 	- Cypress PATA for new ATA layer
   *			  (C) 2006 Red Hat Inc

   *			  Alan Cox

   *
   * Based heavily on
   * linux/drivers/ide/pci/cy82c693.c		Version 0.40	Sep. 10, 2002
   *
   */

  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/pci.h>
  #include <linux/init.h>
  #include <linux/blkdev.h>
  #include <linux/delay.h>
  #include <scsi/scsi_host.h>
  #include <linux/libata.h>
  
  #define DRV_NAME "pata_cypress"

  #define DRV_VERSION "0.1.5"

  
  /* here are the offset definitions for the registers */
  
  enum {
  	CY82_IDE_CMDREG		= 0x04,
  	CY82_IDE_ADDRSETUP	= 0x48,
  	CY82_IDE_MASTER_IOR	= 0x4C,
  	CY82_IDE_MASTER_IOW	= 0x4D,
  	CY82_IDE_SLAVE_IOR	= 0x4E,
  	CY82_IDE_SLAVE_IOW	= 0x4F,
  	CY82_IDE_MASTER_8BIT	= 0x50,
  	CY82_IDE_SLAVE_8BIT	= 0x51,
  
  	CY82_INDEX_PORT		= 0x22,
  	CY82_DATA_PORT		= 0x23,
  
  	CY82_INDEX_CTRLREG1	= 0x01,
  	CY82_INDEX_CHANNEL0	= 0x30,
  	CY82_INDEX_CHANNEL1	= 0x31,
  	CY82_INDEX_TIMEOUT	= 0x32
  };

  /**
   *	cy82c693_set_piomode	-	set initial PIO mode data
   *	@ap: ATA interface
   *	@adev: ATA device
   *
   *	Called to do the PIO mode setup.
   */

  static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
  {
  	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  	struct ata_timing t;
  	const unsigned long T = 1000000 / 33;
  	short time_16, time_8;
  	u32 addr;

  	if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) {
  		printk(KERN_ERR DRV_NAME ": mome computation failed.
  ");
  		return;
  	}

  	time_16 = clamp_val(t.recover - 1, 0, 15) |
  		  (clamp_val(t.active - 1, 0, 15) << 4);
  	time_8 = clamp_val(t.act8b - 1, 0, 15) |
  		 (clamp_val(t.rec8b - 1, 0, 15) << 4);

  	if (adev->devno == 0) {
  		pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);

  		addr &= ~0x0F;	/* Mask bits */

  		addr |= clamp_val(t.setup - 1, 0, 15);

  		pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
  		pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
  		pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);
  		pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);
  	} else {
  		pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);

  		addr &= ~0xF0;	/* Mask bits */

  		addr |= (clamp_val(t.setup - 1, 0, 15) << 4);

  
  		pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
  		pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
  		pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);
  		pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);
  	}
  }
  
  /**
   *	cy82c693_set_dmamode	-	set initial DMA mode data
   *	@ap: ATA interface
   *	@adev: ATA device
   *
   *	Called to do the DMA mode setup.
   */

  static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)
  {
  	int reg = CY82_INDEX_CHANNEL0 + ap->port_no;

  	/* Be afraid, be very afraid. Magic registers  in low I/O space */
  	outb(reg, 0x22);
  	outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);

  	/* 0x50 gives the best behaviour on the Alpha's using this chip */
  	outb(CY82_INDEX_TIMEOUT, 0x22);
  	outb(0x50, 0x23);
  }
  
  static struct scsi_host_template cy82c693_sht = {

  	ATA_BMDMA_SHT(DRV_NAME),

  };
  
  static struct ata_port_operations cy82c693_port_ops = {

  	.inherits	= &ata_bmdma_port_ops,
  	.cable_detect	= ata_cable_40wire,

  	.set_piomode	= cy82c693_set_piomode,
  	.set_dmamode	= cy82c693_set_dmamode,

  };

  
  static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
  {

  	static const struct ata_port_info info = {

  		.flags = ATA_FLAG_SLAVE_POSS,

  		.pio_mask = ATA_PIO4,
  		.mwdma_mask = ATA_MWDMA2,

  		.port_ops = &cy82c693_port_ops
  	};

  	const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };

  	/* Devfn 1 is the ATA primary. The secondary is magic and on devfn2.
  	   For the moment we don't handle the secondary. FIXME */

  	if (PCI_FUNC(pdev->devfn) != 1)
  		return -ENODEV;

  	return ata_pci_bmdma_init_one(pdev, ppi, &cy82c693_sht, NULL, 0);

  }

  static const struct pci_device_id cy82c693[] = {
  	{ PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },
  
  	{ },

  };
  
  static struct pci_driver cy82c693_pci_driver = {

  	.name 		= DRV_NAME,

  	.id_table	= cy82c693,
  	.probe 		= cy82c693_init_one,

  	.remove		= ata_pci_remove_one,

  #ifdef CONFIG_PM

  	.suspend	= ata_pci_device_suspend,
  	.resume		= ata_pci_device_resume,

  #endif

  };
  
  static int __init cy82c693_init(void)
  {
  	return pci_register_driver(&cy82c693_pci_driver);
  }
  
  
  static void __exit cy82c693_exit(void)
  {
  	pci_unregister_driver(&cy82c693_pci_driver);
  }
  
  
  MODULE_AUTHOR("Alan Cox");
  MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
  MODULE_LICENSE("GPL");
  MODULE_DEVICE_TABLE(pci, cy82c693);
  MODULE_VERSION(DRV_VERSION);
  
  module_init(cy82c693_init);
  module_exit(cy82c693_exit);