/*
   * pata-cs5530.c 	- CS5530 PATA for new ATA layer
   *			  (C) 2005 Red Hat Inc

   *
   * based upon cs5530.c by Mark Lord.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   *
   * Loosely based on the piix & svwks drivers.
   *
   * Documentation:
   *	Available from AMD web site.
   */
  
  #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>
  #include <linux/dmi.h>
  
  #define DRV_NAME	"pata_cs5530"

  #define DRV_VERSION	"0.7.4"

  static void __iomem *cs5530_port_base(struct ata_port *ap)
  {
  	unsigned long bmdma = (unsigned long)ap->ioaddr.bmdma_addr;
  
  	return (void __iomem *)((bmdma & ~0x0F) + 0x20 + 0x10 * ap->port_no);
  }

  /**
   *	cs5530_set_piomode		-	PIO setup
   *	@ap: ATA interface
   *	@adev: device on the interface
   *
   *	Set our PIO requirements. This is fairly simple on the CS5530
   *	chips.
   */
  
  static void cs5530_set_piomode(struct ata_port *ap, struct ata_device *adev)
  {
  	static const unsigned int cs5530_pio_timings[2][5] = {
  		{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
  		{0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}
  	};

  	void __iomem *base = cs5530_port_base(ap);

  	u32 tuning;
  	int format;
  
  	/* Find out which table to use */

  	tuning = ioread32(base + 0x04);

  	format = (tuning & 0x80000000UL) ? 1 : 0;
  
  	/* Now load the right timing register */
  	if (adev->devno)
  		base += 0x08;

  	iowrite32(cs5530_pio_timings[format][adev->pio_mode - XFER_PIO_0], base);

  }
  
  /**
   *	cs5530_set_dmamode		-	DMA timing setup
   *	@ap: ATA interface
   *	@adev: Device being configured
   *
   *	We cannot mix MWDMA and UDMA without reloading timings each switch
   *	master to slave. We track the last DMA setup in order to minimise
   *	reloads.
   */
  
  static void cs5530_set_dmamode(struct ata_port *ap, struct ata_device *adev)
  {

  	void __iomem *base = cs5530_port_base(ap);

  	u32 tuning, timing = 0;
  	u8 reg;
  
  	/* Find out which table to use */

  	tuning = ioread32(base + 0x04);

  
  	switch(adev->dma_mode) {
  		case XFER_UDMA_0:
  			timing  = 0x00921250;break;
  		case XFER_UDMA_1:
  			timing  = 0x00911140;break;
  		case XFER_UDMA_2:
  			timing  = 0x00911030;break;
  		case XFER_MW_DMA_0:
  			timing  = 0x00077771;break;
  		case XFER_MW_DMA_1:
  			timing  = 0x00012121;break;
  		case XFER_MW_DMA_2:
  			timing  = 0x00002020;break;
  		default:
  			BUG();
  	}
  	/* Merge in the PIO format bit */
  	timing |= (tuning & 0x80000000UL);
  	if (adev->devno == 0) /* Master */

  		iowrite32(timing, base + 0x04);

  	else {
  		if (timing & 0x00100000)
  			tuning |= 0x00100000;	/* UDMA for both */
  		else
  			tuning &= ~0x00100000;	/* MWDMA for both */

  		iowrite32(tuning, base + 0x04);
  		iowrite32(timing, base + 0x0C);

  	}
  
  	/* Set the DMA capable bit in the BMDMA area */

  	reg = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);

  	reg |= (1 << (5 + adev->devno));

  	iowrite8(reg, ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);

  
  	/* Remember the last DMA setup we did */
  
  	ap->private_data = adev;
  }
  
  /**

   *	cs5530_qc_issue		-	command issue

   *	@qc: command pending
   *
   *	Called when the libata layer is about to issue a command. We wrap
   *	this interface so that we can load the correct ATA timings if

   *	necessary.  Specifically we have a problem that there is only

   *	one MWDMA/UDMA bit.
   */

  static unsigned int cs5530_qc_issue(struct ata_queued_cmd *qc)

  {
  	struct ata_port *ap = qc->ap;
  	struct ata_device *adev = qc->dev;
  	struct ata_device *prev = ap->private_data;
  
  	/* See if the DMA settings could be wrong */

  	if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {

  		/* Maybe, but do the channels match MWDMA/UDMA ? */

  		if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
  		    (ata_using_udma(prev) && !ata_using_udma(adev)))

  		    	/* Switch the mode bits */
  		    	cs5530_set_dmamode(ap, adev);
  	}

  	return ata_bmdma_qc_issue(qc);

  }

  static struct scsi_host_template cs5530_sht = {

  	ATA_BMDMA_SHT(DRV_NAME),
  	.sg_tablesize	= LIBATA_DUMB_MAX_PRD,

  };
  
  static struct ata_port_operations cs5530_port_ops = {

  	.inherits	= &ata_bmdma_port_ops,

  	.qc_prep 	= ata_bmdma_dumb_qc_prep,

  	.qc_issue	= cs5530_qc_issue,

  	.cable_detect	= ata_cable_40wire,
  	.set_piomode	= cs5530_set_piomode,
  	.set_dmamode	= cs5530_set_dmamode,

  };

  static const struct dmi_system_id palmax_dmi_table[] = {

  	{
  		.ident = "Palmax PD1100",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "Cyrix"),
  			DMI_MATCH(DMI_PRODUCT_NAME, "Caddis"),
  		},
  	},
  	{ }
  };
  
  static int cs5530_is_palmax(void)
  {
  	if (dmi_check_system(palmax_dmi_table)) {
  		printk(KERN_INFO "Palmax PD1100: Disabling DMA on docking port.
  ");
  		return 1;
  	}
  	return 0;
  }

  /**

   *	cs5530_init_chip	-	Chipset init

   *

   *	Perform the chip initialisation work that is shared between both
   *	setup and resume paths

   */

  static int cs5530_init_chip(void)

  {

  	struct pci_dev *master_0 = NULL, *cs5530_0 = NULL, *dev = NULL;

  	while ((dev = pci_get_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) {
  		switch (dev->device) {
  			case PCI_DEVICE_ID_CYRIX_PCI_MASTER:
  				master_0 = pci_dev_get(dev);
  				break;
  			case PCI_DEVICE_ID_CYRIX_5530_LEGACY:
  				cs5530_0 = pci_dev_get(dev);
  				break;
  		}
  	}
  	if (!master_0) {
  		printk(KERN_ERR DRV_NAME ": unable to locate PCI MASTER function
  ");
  		goto fail_put;
  	}
  	if (!cs5530_0) {
  		printk(KERN_ERR DRV_NAME ": unable to locate CS5530 LEGACY function
  ");
  		goto fail_put;
  	}
  
  	pci_set_master(cs5530_0);

  	pci_try_set_mwi(cs5530_0);

  
  	/*
  	 * Set PCI CacheLineSize to 16-bytes:
  	 * --> Write 0x04 into 8-bit PCI CACHELINESIZE reg of function 0 of the cs5530
  	 *
  	 * Note: This value is constant because the 5530 is only a Geode companion
  	 */
  
  	pci_write_config_byte(cs5530_0, PCI_CACHE_LINE_SIZE, 0x04);
  
  	/*
  	 * Disable trapping of UDMA register accesses (Win98 hack):
  	 * --> Write 0x5006 into 16-bit reg at offset 0xd0 of function 0 of the cs5530
  	 */
  
  	pci_write_config_word(cs5530_0, 0xd0, 0x5006);
  
  	/*
  	 * Bit-1 at 0x40 enables MemoryWriteAndInvalidate on internal X-bus:
  	 * The other settings are what is necessary to get the register
  	 * into a sane state for IDE DMA operation.
  	 */
  
  	pci_write_config_byte(master_0, 0x40, 0x1e);
  
  	/*
  	 * Set max PCI burst size (16-bytes seems to work best):
  	 *	   16bytes: set bit-1 at 0x41 (reg value of 0x16)
  	 *	all others: clear bit-1 at 0x41, and do:
  	 *	  128bytes: OR 0x00 at 0x41
  	 *	  256bytes: OR 0x04 at 0x41
  	 *	  512bytes: OR 0x08 at 0x41
  	 *	 1024bytes: OR 0x0c at 0x41
  	 */
  
  	pci_write_config_byte(master_0, 0x41, 0x14);
  
  	/*
  	 * These settings are necessary to get the chip
  	 * into a sane state for IDE DMA operation.
  	 */
  
  	pci_write_config_byte(master_0, 0x42, 0x00);
  	pci_write_config_byte(master_0, 0x43, 0xc1);
  
  	pci_dev_put(master_0);
  	pci_dev_put(cs5530_0);

  	return 0;

  fail_put:
  	if (master_0)
  		pci_dev_put(master_0);
  	if (cs5530_0)
  		pci_dev_put(cs5530_0);
  	return -ENODEV;
  }

  /**
   *	cs5530_init_one		-	Initialise a CS5530
   *	@dev: PCI device
   *	@id: Entry in match table
   *
   *	Install a driver for the newly found CS5530 companion chip. Most of
   *	this is just housekeeping. We have to set the chip up correctly and
   *	turn off various bits of emulation magic.
   */
  
  static int cs5530_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,
  		.udma_mask = ATA_UDMA2,

  		.port_ops = &cs5530_port_ops
  	};
  	/* The docking connector doesn't do UDMA, and it seems not MWDMA */

  	static const struct ata_port_info info_palmax_secondary = {

  		.flags = ATA_FLAG_SLAVE_POSS,

  		.pio_mask = ATA_PIO4,

  		.port_ops = &cs5530_port_ops
  	};

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

  	int rc;
  
  	rc = pcim_enable_device(pdev);
  	if (rc)
  		return rc;

  	/* Chip initialisation */
  	if (cs5530_init_chip())
  		return -ENODEV;

  	if (cs5530_is_palmax())

  		ppi[1] = &info_palmax_secondary;

  
  	/* Now kick off ATA set up */

  	return ata_pci_bmdma_init_one(pdev, ppi, &cs5530_sht, NULL, 0);

  }

  #ifdef CONFIG_PM

  static int cs5530_reinit_one(struct pci_dev *pdev)
  {

  	struct ata_host *host = dev_get_drvdata(&pdev->dev);
  	int rc;
  
  	rc = ata_pci_device_do_resume(pdev);
  	if (rc)
  		return rc;

  	/* If we fail on resume we are doomed */

  	if (cs5530_init_chip())

  		return -EIO;
  
  	ata_host_resume(host);
  	return 0;

  }

  #endif /* CONFIG_PM */

  static const struct pci_device_id cs5530[] = {
  	{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE), },
  
  	{ },

  };
  
  static struct pci_driver cs5530_pci_driver = {

  	.name 		= DRV_NAME,

  	.id_table	= cs5530,
  	.probe 		= cs5530_init_one,

  	.remove		= ata_pci_remove_one,

  #ifdef CONFIG_PM

  	.suspend	= ata_pci_device_suspend,
  	.resume		= cs5530_reinit_one,

  #endif

  };
  
  static int __init cs5530_init(void)
  {
  	return pci_register_driver(&cs5530_pci_driver);
  }

  static void __exit cs5530_exit(void)
  {
  	pci_unregister_driver(&cs5530_pci_driver);
  }

  MODULE_AUTHOR("Alan Cox");
  MODULE_DESCRIPTION("low-level driver for the Cyrix/NS/AMD 5530");
  MODULE_LICENSE("GPL");
  MODULE_DEVICE_TABLE(pci, cs5530);
  MODULE_VERSION(DRV_VERSION);
  
  module_init(cs5530_init);
  module_exit(cs5530_exit);