/*

   *    ata_piix.c - Intel PATA/SATA controllers
   *
   *    Maintained by:  Jeff Garzik <jgarzik@pobox.com>
   *    		    Please ALWAYS copy linux-ide@vger.kernel.org
   *		    on emails.
   *
   *
   *	Copyright 2003-2005 Red Hat Inc
   *	Copyright 2003-2005 Jeff Garzik
   *
   *
   *	Copyright header from piix.c:
   *
   *  Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
   *  Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>

   *  Copyright (C) 2003 Red Hat Inc

   *
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2, or (at your option)
   *  any later version.
   *
   *  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; see the file COPYING.  If not, write to
   *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
   *
   *
   *  libata documentation is available via 'make {ps|pdf}docs',
   *  as Documentation/DocBook/libata.*
   *
   *  Hardware documentation available at http://developer.intel.com/
   *

   * Documentation
   *	Publically available from Intel web site. Errata documentation
   * is also publically available. As an aide to anyone hacking on this

   * driver the list of errata that are relevant is below, going back to

   * PIIX4. Older device documentation is now a bit tricky to find.
   *

   * The chipsets all follow very much the same design. The original Triton

   * series chipsets do _not_ support independant device timings, but this
   * is fixed in Triton II. With the odd mobile exception the chips then
   * change little except in gaining more modes until SATA arrives. This
   * driver supports only the chips with independant timing (that is those
   * with SITRE and the 0x44 timing register). See pata_oldpiix and pata_mpiix
   * for the early chip drivers.
   *
   * Errata of note:
   *
   * Unfixable
   *	PIIX4    errata #9	- Only on ultra obscure hw
   *	ICH3	 errata #13     - Not observed to affect real hw
   *				  by Intel
   *
   * Things we must deal with
   *	PIIX4	errata #10	- BM IDE hang with non UDMA
   *				  (must stop/start dma to recover)
   *	440MX   errata #15	- As PIIX4 errata #10
   *	PIIX4	errata #15	- Must not read control registers
   * 				  during a PIO transfer
   *	440MX   errata #13	- As PIIX4 errata #15
   *	ICH2	errata #21	- DMA mode 0 doesn't work right
   *	ICH0/1  errata #55	- As ICH2 errata #21
   *	ICH2	spec c #9	- Extra operations needed to handle
   *				  drive hotswap [NOT YET SUPPORTED]
   *	ICH2    spec c #20	- IDE PRD must not cross a 64K boundary
   *				  and must be dword aligned
   *	ICH2    spec c #24	- UDMA mode 4,5 t85/86 should be 6ns not 3.3

   *	ICH7	errata #16	- MWDMA1 timings are incorrect

   *
   * Should have been BIOS fixed:
   *	450NX:	errata #19	- DMA hangs on old 450NX
   *	450NX:  errata #20	- DMA hangs on old 450NX
   *	450NX:  errata #25	- Corruption with DMA on old 450NX
   *	ICH3    errata #15      - IDE deadlock under high load
   *				  (BIOS must set dev 31 fn 0 bit 23)
   *	ICH3	errata #18	- Don't use native mode

   */
  
  #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 <linux/device.h>

  #include <linux/gfp.h>

  #include <scsi/scsi_host.h>
  #include <linux/libata.h>

  #include <linux/dmi.h>

  
  #define DRV_NAME	"ata_piix"

  #define DRV_VERSION	"2.13"

  
  enum {
  	PIIX_IOCFG		= 0x54, /* IDE I/O configuration register */
  	ICH5_PMR		= 0x90, /* port mapping register */
  	ICH5_PCS		= 0x92,	/* port control and status */

  	PIIX_SIDPR_BAR		= 5,
  	PIIX_SIDPR_LEN		= 16,
  	PIIX_SIDPR_IDX		= 0,
  	PIIX_SIDPR_DATA		= 4,

  	PIIX_FLAG_CHECKINTR	= (1 << 28), /* make sure PCI INTx enabled */

  	PIIX_FLAG_SIDPR		= (1 << 29), /* SATA idx/data pair regs */

  	PIIX_PATA_FLAGS		= ATA_FLAG_SLAVE_POSS,
  	PIIX_SATA_FLAGS		= ATA_FLAG_SATA | PIIX_FLAG_CHECKINTR,

  	PIIX_80C_PRI		= (1 << 5) | (1 << 4),
  	PIIX_80C_SEC		= (1 << 7) | (1 << 6),

  	/* constants for mapping table */
  	P0			= 0,  /* port 0 */
  	P1			= 1,  /* port 1 */
  	P2			= 2,  /* port 2 */
  	P3			= 3,  /* port 3 */
  	IDE			= -1, /* IDE */
  	NA			= -2, /* not avaliable */
  	RV			= -3, /* reserved */

  	PIIX_AHCI_DEVICE	= 6,

  
  	/* host->flags bits */
  	PIIX_HOST_BROKEN_SUSPEND = (1 << 24),

  };

  enum piix_controller_ids {
  	/* controller IDs */
  	piix_pata_mwdma,	/* PIIX3 MWDMA only */
  	piix_pata_33,		/* PIIX4 at 33Mhz */
  	ich_pata_33,		/* ICH up to UDMA 33 only */
  	ich_pata_66,		/* ICH up to 66 Mhz */
  	ich_pata_100,		/* ICH up to UDMA 100 */

  	ich_pata_100_nomwdma1,	/* ICH up to UDMA 100 but with no MWDMA1*/

  	ich5_sata,
  	ich6_sata,

  	ich6m_sata,
  	ich8_sata,

  	ich8_2port_sata,

  	ich8m_apple_sata,	/* locks up on second port enable */
  	tolapai_sata,

  	piix_pata_vmw,			/* PIIX4 for VMware, spurious DMA_ERR */
  };

  struct piix_map_db {
  	const u32 mask;

  	const u16 port_enable;

  	const int map[][4];
  };

  struct piix_host_priv {
  	const int *map;

  	u32 saved_iocfg;

  	spinlock_t sidpr_lock;	/* FIXME: remove once locking in EH is fixed */

  	void __iomem *sidpr;

  };

  static int piix_init_one(struct pci_dev *pdev,
  			 const struct pci_device_id *ent);

  static void piix_remove_one(struct pci_dev *pdev);

  static int piix_pata_prereset(struct ata_link *link, unsigned long deadline);

  static void piix_set_piomode(struct ata_port *ap, struct ata_device *adev);
  static void piix_set_dmamode(struct ata_port *ap, struct ata_device *adev);
  static void ich_set_dmamode(struct ata_port *ap, struct ata_device *adev);

  static int ich_pata_cable_detect(struct ata_port *ap);

  static u8 piix_vmw_bmdma_status(struct ata_port *ap);

  static int piix_sidpr_scr_read(struct ata_link *link,
  			       unsigned int reg, u32 *val);
  static int piix_sidpr_scr_write(struct ata_link *link,
  				unsigned int reg, u32 val);

  static bool piix_irq_check(struct ata_port *ap);

  #ifdef CONFIG_PM
  static int piix_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
  static int piix_pci_device_resume(struct pci_dev *pdev);
  #endif

  
  static unsigned int in_module_init = 1;

  static const struct pci_device_id piix_pci_tbl[] = {

  	/* Intel PIIX3 for the 430HX etc */
  	{ 0x8086, 0x7010, PCI_ANY_ID, PCI_ANY_ID, 0, 0, piix_pata_mwdma },

  	/* VMware ICH4 */
  	{ 0x8086, 0x7111, 0x15ad, 0x1976, 0, 0, piix_pata_vmw },

  	/* Intel PIIX4 for the 430TX/440BX/MX chipset: UDMA 33 */
  	/* Also PIIX4E (fn3 rev 2) and PIIX4M (fn3 rev 3) */
  	{ 0x8086, 0x7111, PCI_ANY_ID, PCI_ANY_ID, 0, 0, piix_pata_33 },

  	/* Intel PIIX4 */
  	{ 0x8086, 0x7199, PCI_ANY_ID, PCI_ANY_ID, 0, 0, piix_pata_33 },
  	/* Intel PIIX4 */
  	{ 0x8086, 0x7601, PCI_ANY_ID, PCI_ANY_ID, 0, 0, piix_pata_33 },
  	/* Intel PIIX */
  	{ 0x8086, 0x84CA, PCI_ANY_ID, PCI_ANY_ID, 0, 0, piix_pata_33 },
  	/* Intel ICH (i810, i815, i840) UDMA 66*/
  	{ 0x8086, 0x2411, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_66 },
  	/* Intel ICH0 : UDMA 33*/
  	{ 0x8086, 0x2421, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_33 },
  	/* Intel ICH2M */
  	{ 0x8086, 0x244A, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
  	/* Intel ICH2 (i810E2, i845, 850, 860) UDMA 100 */
  	{ 0x8086, 0x244B, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
  	/*  Intel ICH3M */
  	{ 0x8086, 0x248A, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
  	/* Intel ICH3 (E7500/1) UDMA 100 */
  	{ 0x8086, 0x248B, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
  	/* Intel ICH4 (i845GV, i845E, i852, i855) UDMA 100 */
  	{ 0x8086, 0x24CA, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
  	{ 0x8086, 0x24CB, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
  	/* Intel ICH5 */

  	{ 0x8086, 0x24DB, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },

  	/* C-ICH (i810E2) */
  	{ 0x8086, 0x245B, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },

  	/* ESB (855GME/875P + 6300ESB) UDMA 100  */

  	{ 0x8086, 0x25A2, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
  	/* ICH6 (and 6) (i915) UDMA 100 */
  	{ 0x8086, 0x266F, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
  	/* ICH7/7-R (i945, i975) UDMA 100*/

  	{ 0x8086, 0x27DF, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100_nomwdma1 },
  	{ 0x8086, 0x269E, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100_nomwdma1 },

  	/* ICH8 Mobile PATA Controller */
  	{ 0x8086, 0x2850, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },

  	/* SATA ports */
  	

  	/* 82801EB (ICH5) */

  	{ 0x8086, 0x24d1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },

  	/* 82801EB (ICH5) */

  	{ 0x8086, 0x24df, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },

  	/* 6300ESB (ICH5 variant with broken PCS present bits) */

  	{ 0x8086, 0x25a3, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },

  	/* 6300ESB pretending RAID */

  	{ 0x8086, 0x25b0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },

  	/* 82801FB/FW (ICH6/ICH6W) */

  	{ 0x8086, 0x2651, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata },

  	/* 82801FR/FRW (ICH6R/ICH6RW) */

  	{ 0x8086, 0x2652, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata },

  	/* 82801FBM ICH6M (ICH6R with only port 0 and 2 implemented).
  	 * Attach iff the controller is in IDE mode. */
  	{ 0x8086, 0x2653, PCI_ANY_ID, PCI_ANY_ID,

  	  PCI_CLASS_STORAGE_IDE << 8, 0xffff00, ich6m_sata },

  	/* 82801GB/GR/GH (ICH7, identical to ICH6) */

  	{ 0x8086, 0x27c0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata },

  	/* 2801GBM/GHM (ICH7M, identical to ICH6M) */

  	{ 0x8086, 0x27c4, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6m_sata },

  	/* Enterprise Southbridge 2 (631xESB/632xESB) */

  	{ 0x8086, 0x2680, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata },

  	/* SATA Controller 1 IDE (ICH8) */

  	{ 0x8086, 0x2820, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata },

  	/* SATA Controller 2 IDE (ICH8) */

  	{ 0x8086, 0x2825, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },

  	/* Mobile SATA Controller IDE (ICH8M), Apple */

  	{ 0x8086, 0x2828, 0x106b, 0x00a0, 0, 0, ich8m_apple_sata },

  	{ 0x8086, 0x2828, 0x106b, 0x00a1, 0, 0, ich8m_apple_sata },

  	{ 0x8086, 0x2828, 0x106b, 0x00a3, 0, 0, ich8m_apple_sata },

  	/* Mobile SATA Controller IDE (ICH8M) */
  	{ 0x8086, 0x2828, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata },

  	/* SATA Controller IDE (ICH9) */

  	{ 0x8086, 0x2920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata },

  	/* SATA Controller IDE (ICH9) */

  	{ 0x8086, 0x2921, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },

  	/* SATA Controller IDE (ICH9) */

  	{ 0x8086, 0x2926, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },

  	/* SATA Controller IDE (ICH9M) */

  	{ 0x8086, 0x2928, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },

  	/* SATA Controller IDE (ICH9M) */

  	{ 0x8086, 0x292d, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },

  	/* SATA Controller IDE (ICH9M) */

  	{ 0x8086, 0x292e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata },

  	/* SATA Controller IDE (Tolapai) */

  	{ 0x8086, 0x5028, PCI_ANY_ID, PCI_ANY_ID, 0, 0, tolapai_sata },

  	/* SATA Controller IDE (ICH10) */

  	{ 0x8086, 0x3a00, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata },

  	/* SATA Controller IDE (ICH10) */
  	{ 0x8086, 0x3a06, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
  	/* SATA Controller IDE (ICH10) */

  	{ 0x8086, 0x3a20, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata },

  	/* SATA Controller IDE (ICH10) */
  	{ 0x8086, 0x3a26, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },

  	/* SATA Controller IDE (PCH) */
  	{ 0x8086, 0x3b20, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata },
  	/* SATA Controller IDE (PCH) */

  	{ 0x8086, 0x3b21, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
  	/* SATA Controller IDE (PCH) */

  	{ 0x8086, 0x3b26, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
  	/* SATA Controller IDE (PCH) */

  	{ 0x8086, 0x3b28, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata },
  	/* SATA Controller IDE (PCH) */

  	{ 0x8086, 0x3b2d, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
  	/* SATA Controller IDE (PCH) */
  	{ 0x8086, 0x3b2e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata },

  	/* SATA Controller IDE (CPT) */
  	{ 0x8086, 0x1c00, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata },
  	/* SATA Controller IDE (CPT) */
  	{ 0x8086, 0x1c01, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata },
  	/* SATA Controller IDE (CPT) */
  	{ 0x8086, 0x1c08, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
  	/* SATA Controller IDE (CPT) */
  	{ 0x8086, 0x1c09, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },

  	{ }	/* terminate list */
  };
  
  static struct pci_driver piix_pci_driver = {
  	.name			= DRV_NAME,
  	.id_table		= piix_pci_tbl,
  	.probe			= piix_init_one,

  	.remove			= piix_remove_one,

  #ifdef CONFIG_PM

  	.suspend		= piix_pci_device_suspend,
  	.resume			= piix_pci_device_resume,

  #endif

  };

  static struct scsi_host_template piix_sht = {

  	ATA_BMDMA_SHT(DRV_NAME),

  };

  static struct ata_port_operations piix_sata_ops = {

  	.inherits		= &ata_bmdma32_port_ops,

  	.sff_irq_check		= piix_irq_check,
  };
  
  static struct ata_port_operations piix_pata_ops = {
  	.inherits		= &piix_sata_ops,

  	.cable_detect		= ata_cable_40wire,

  	.set_piomode		= piix_set_piomode,
  	.set_dmamode		= piix_set_dmamode,

  	.prereset		= piix_pata_prereset,

  };

  static struct ata_port_operations piix_vmw_ops = {
  	.inherits		= &piix_pata_ops,
  	.bmdma_status		= piix_vmw_bmdma_status,

  };

  static struct ata_port_operations ich_pata_ops = {
  	.inherits		= &piix_pata_ops,
  	.cable_detect		= ich_pata_cable_detect,
  	.set_dmamode		= ich_set_dmamode,

  };

  static struct ata_port_operations piix_sidpr_sata_ops = {
  	.inherits		= &piix_sata_ops,

  	.hardreset		= sata_std_hardreset,

  	.scr_read		= piix_sidpr_scr_read,
  	.scr_write		= piix_sidpr_scr_write,

  };

  static const struct piix_map_db ich5_map_db = {

  	.mask = 0x7,

  	.port_enable = 0x3,

  	.map = {
  		/* PM   PS   SM   SS       MAP  */
  		{  P0,  NA,  P1,  NA }, /* 000b */
  		{  P1,  NA,  P0,  NA }, /* 001b */
  		{  RV,  RV,  RV,  RV },
  		{  RV,  RV,  RV,  RV },
  		{  P0,  P1, IDE, IDE }, /* 100b */
  		{  P1,  P0, IDE, IDE }, /* 101b */
  		{ IDE, IDE,  P0,  P1 }, /* 110b */
  		{ IDE, IDE,  P1,  P0 }, /* 111b */
  	},
  };

  static const struct piix_map_db ich6_map_db = {

  	.mask = 0x3,

  	.port_enable = 0xf,

  	.map = {
  		/* PM   PS   SM   SS       MAP */

  		{  P0,  P2,  P1,  P3 }, /* 00b */

  		{ IDE, IDE,  P1,  P3 }, /* 01b */
  		{  P0,  P2, IDE, IDE }, /* 10b */
  		{  RV,  RV,  RV,  RV },
  	},
  };

  static const struct piix_map_db ich6m_map_db = {

  	.mask = 0x3,

  	.port_enable = 0x5,

  
  	/* Map 01b isn't specified in the doc but some notebooks use

  	 * it anyway.  MAP 01b have been spotted on both ICH6M and
  	 * ICH7M.

  	 */
  	.map = {
  		/* PM   PS   SM   SS       MAP */

  		{  P0,  P2,  NA,  NA }, /* 00b */

  		{ IDE, IDE,  P1,  P3 }, /* 01b */
  		{  P0,  P2, IDE, IDE }, /* 10b */
  		{  RV,  RV,  RV,  RV },
  	},
  };

  static const struct piix_map_db ich8_map_db = {
  	.mask = 0x3,

  	.port_enable = 0xf,

  	.map = {
  		/* PM   PS   SM   SS       MAP */

  		{  P0,  P2,  P1,  P3 }, /* 00b (hardwired when in AHCI) */

  		{  RV,  RV,  RV,  RV },

  		{  P0,  P2, IDE, IDE }, /* 10b (IDE mode) */

  		{  RV,  RV,  RV,  RV },
  	},
  };

  static const struct piix_map_db ich8_2port_map_db = {

  	.mask = 0x3,
  	.port_enable = 0x3,
  	.map = {
  		/* PM   PS   SM   SS       MAP */
  		{  P0,  NA,  P1,  NA }, /* 00b */
  		{  RV,  RV,  RV,  RV }, /* 01b */
  		{  RV,  RV,  RV,  RV }, /* 10b */
  		{  RV,  RV,  RV,  RV },
  	},

  };

  static const struct piix_map_db ich8m_apple_map_db = {
  	.mask = 0x3,
  	.port_enable = 0x1,
  	.map = {
  		/* PM   PS   SM   SS       MAP */
  		{  P0,  NA,  NA,  NA }, /* 00b */
  		{  RV,  RV,  RV,  RV },
  		{  P0,  P2, IDE, IDE }, /* 10b */
  		{  RV,  RV,  RV,  RV },
  	},
  };

  static const struct piix_map_db tolapai_map_db = {

  	.mask = 0x3,
  	.port_enable = 0x3,
  	.map = {
  		/* PM   PS   SM   SS       MAP */
  		{  P0,  NA,  P1,  NA }, /* 00b */
  		{  RV,  RV,  RV,  RV }, /* 01b */
  		{  RV,  RV,  RV,  RV }, /* 10b */
  		{  RV,  RV,  RV,  RV },
  	},
  };

  static const struct piix_map_db *piix_map_db_table[] = {
  	[ich5_sata]		= &ich5_map_db,

  	[ich6_sata]		= &ich6_map_db,

  	[ich6m_sata]		= &ich6m_map_db,
  	[ich8_sata]		= &ich8_map_db,

  	[ich8_2port_sata]	= &ich8_2port_map_db,

  	[ich8m_apple_sata]	= &ich8m_apple_map_db,
  	[tolapai_sata]		= &tolapai_map_db,

  };

  static struct ata_port_info piix_port_info[] = {

  	[piix_pata_mwdma] = 	/* PIIX3 MWDMA only */
  	{

  		.flags		= PIIX_PATA_FLAGS,

  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA12_ONLY, /* mwdma1-2 ?? CHECK 0 should be ok but slow */

  		.port_ops	= &piix_pata_ops,
  	},

  	[piix_pata_33] =	/* PIIX4 at 33MHz */

  	{

  		.flags		= PIIX_PATA_FLAGS,

  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA12_ONLY, /* mwdma1-2 ?? CHECK 0 should be ok but slow */
  		.udma_mask	= ATA_UDMA2,

  		.port_ops	= &piix_pata_ops,
  	},

  	[ich_pata_33] = 	/* ICH0 - ICH at 33Mhz*/

  	{

  		.flags		= PIIX_PATA_FLAGS,

  		.pio_mask 	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA12_ONLY, /* Check: maybe MWDMA0 is ok  */
  		.udma_mask	= ATA_UDMA2,

  		.port_ops	= &ich_pata_ops,
  	},

  
  	[ich_pata_66] = 	/* ICH controllers up to 66MHz */

  	{

  		.flags		= PIIX_PATA_FLAGS,

  		.pio_mask 	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA12_ONLY, /* MWDMA0 is broken on chip */

  		.udma_mask	= ATA_UDMA4,
  		.port_ops	= &ich_pata_ops,
  	},

  	[ich_pata_100] =

  	{

  		.flags		= PIIX_PATA_FLAGS | PIIX_FLAG_CHECKINTR,

  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA12_ONLY,
  		.udma_mask	= ATA_UDMA5,

  		.port_ops	= &ich_pata_ops,

  	},

  	[ich_pata_100_nomwdma1] =
  	{
  		.flags		= PIIX_PATA_FLAGS | PIIX_FLAG_CHECKINTR,
  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA2_ONLY,
  		.udma_mask	= ATA_UDMA5,
  		.port_ops	= &ich_pata_ops,
  	},

  	[ich5_sata] =

  	{

  		.flags		= PIIX_SATA_FLAGS,

  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA2,

  		.udma_mask	= ATA_UDMA6,

  		.port_ops	= &piix_sata_ops,
  	},

  	[ich6_sata] =

  	{

  		.flags		= PIIX_SATA_FLAGS,

  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA2,

  		.udma_mask	= ATA_UDMA6,

  		.port_ops	= &piix_sata_ops,
  	},

  	[ich6m_sata] =

  	{

  		.flags		= PIIX_SATA_FLAGS,

  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA2,

  		.udma_mask	= ATA_UDMA6,

  		.port_ops	= &piix_sata_ops,
  	},

  	[ich8_sata] =

  	{

  		.flags		= PIIX_SATA_FLAGS | PIIX_FLAG_SIDPR,

  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA2,

  		.udma_mask	= ATA_UDMA6,

  		.port_ops	= &piix_sata_ops,
  	},

  	[ich8_2port_sata] =

  	{

  		.flags		= PIIX_SATA_FLAGS | PIIX_FLAG_SIDPR,

  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA2,

  		.udma_mask	= ATA_UDMA6,
  		.port_ops	= &piix_sata_ops,
  	},

  	[tolapai_sata] =

  	{

  		.flags		= PIIX_SATA_FLAGS,

  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA2,

  		.udma_mask	= ATA_UDMA6,
  		.port_ops	= &piix_sata_ops,
  	},

  	[ich8m_apple_sata] =

  	{

  		.flags		= PIIX_SATA_FLAGS,

  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA2,

  		.udma_mask	= ATA_UDMA6,
  		.port_ops	= &piix_sata_ops,
  	},

  	[piix_pata_vmw] =
  	{

  		.flags		= PIIX_PATA_FLAGS,

  		.pio_mask	= ATA_PIO4,
  		.mwdma_mask	= ATA_MWDMA12_ONLY, /* mwdma1-2 ?? CHECK 0 should be ok but slow */
  		.udma_mask	= ATA_UDMA2,

  		.port_ops	= &piix_vmw_ops,
  	},

  };
  
  static struct pci_bits piix_enable_bits[] = {
  	{ 0x41U, 1U, 0x80UL, 0x80UL },	/* port 0 */
  	{ 0x43U, 1U, 0x80UL, 0x80UL },	/* port 1 */
  };
  
  MODULE_AUTHOR("Andre Hedrick, Alan Cox, Andrzej Krzysztofowicz, Jeff Garzik");
  MODULE_DESCRIPTION("SCSI low-level driver for Intel PIIX/ICH ATA controllers");
  MODULE_LICENSE("GPL");
  MODULE_DEVICE_TABLE(pci, piix_pci_tbl);
  MODULE_VERSION(DRV_VERSION);

  struct ich_laptop {
  	u16 device;
  	u16 subvendor;
  	u16 subdevice;
  };
  
  /*
   *	List of laptops that use short cables rather than 80 wire
   */
  
  static const struct ich_laptop ich_laptop[] = {
  	/* devid, subvendor, subdev */
  	{ 0x27DF, 0x0005, 0x0280 },	/* ICH7 on Acer 5602WLMi */

  	{ 0x27DF, 0x1025, 0x0102 },	/* ICH7 on Acer 5602aWLMi */

  	{ 0x27DF, 0x1025, 0x0110 },	/* ICH7 on Acer 3682WLMi */

  	{ 0x27DF, 0x1028, 0x02b0 },	/* ICH7 on unknown Dell */

  	{ 0x27DF, 0x1043, 0x1267 },	/* ICH7 on Asus W5F */

  	{ 0x27DF, 0x103C, 0x30A1 },	/* ICH7 on HP Compaq nc2400 */

  	{ 0x27DF, 0x103C, 0x361a },	/* ICH7 on unknown HP  */

  	{ 0x27DF, 0x1071, 0xD221 },	/* ICH7 on Hercules EC-900 */

  	{ 0x27DF, 0x152D, 0x0778 },	/* ICH7 on unknown Intel */

  	{ 0x24CA, 0x1025, 0x0061 },	/* ICH4 on ACER Aspire 2023WLMi */

  	{ 0x24CA, 0x1025, 0x003d },	/* ICH4 on ACER TM290 */
  	{ 0x266F, 0x1025, 0x0066 },	/* ICH6 on ACER Aspire 1694WLMi */

  	{ 0x2653, 0x1043, 0x82D8 },	/* ICH6M on Asus Eee 701 */

  	{ 0x27df, 0x104d, 0x900e },	/* ICH7 on Sony TZ-90 */

  	/* end marker */
  	{ 0, }
  };

  /**

   *	ich_pata_cable_detect - Probe host controller cable detect info

   *	@ap: Port for which cable detect info is desired
   *
   *	Read 80c cable indicator from ATA PCI device's PCI config
   *	register.  This register is normally set by firmware (BIOS).
   *
   *	LOCKING:
   *	None (inherited from caller).
   */

  static int ich_pata_cable_detect(struct ata_port *ap)

  {

  	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

  	struct piix_host_priv *hpriv = ap->host->private_data;

  	const struct ich_laptop *lap = &ich_laptop[0];

  	u8 mask;

  	/* Check for specials - Acer Aspire 5602WLMi */
  	while (lap->device) {
  		if (lap->device == pdev->device &&
  		    lap->subvendor == pdev->subsystem_vendor &&

  		    lap->subdevice == pdev->subsystem_device)

  			return ATA_CBL_PATA40_SHORT;

  		lap++;
  	}

  	/* check BIOS cable detect results */

  	mask = ap->port_no == 0 ? PIIX_80C_PRI : PIIX_80C_SEC;

  	if ((hpriv->saved_iocfg & mask) == 0)

  		return ATA_CBL_PATA40;
  	return ATA_CBL_PATA80;

  }
  
  /**

   *	piix_pata_prereset - prereset for PATA host controller

   *	@link: Target link

   *	@deadline: deadline jiffies for the operation

   *

   *	LOCKING:
   *	None (inherited from caller).
   */

  static int piix_pata_prereset(struct ata_link *link, unsigned long deadline)

  {

  	struct ata_port *ap = link->ap;

  	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

  	if (!pci_test_config_bits(pdev, &piix_enable_bits[ap->port_no]))
  		return -ENOENT;

  	return ata_sff_prereset(link, deadline);

  }

  static DEFINE_SPINLOCK(piix_lock);

  /**
   *	piix_set_piomode - Initialize host controller PATA PIO timings
   *	@ap: Port whose timings we are configuring
   *	@adev: um

   *
   *	Set PIO mode for device, in host controller PCI config space.
   *
   *	LOCKING:
   *	None (inherited from caller).
   */

  static void piix_set_piomode(struct ata_port *ap, struct ata_device *adev)

  {

  	struct pci_dev *dev	= to_pci_dev(ap->host->dev);

  	unsigned long flags;
  	unsigned int pio	= adev->pio_mode - XFER_PIO_0;

  	unsigned int is_slave	= (adev->devno != 0);

  	unsigned int master_port= ap->port_no ? 0x42 : 0x40;

  	unsigned int slave_port	= 0x44;
  	u16 master_data;
  	u8 slave_data;

  	u8 udma_enable;
  	int control = 0;

  	/*
  	 *	See Intel Document 298600-004 for the timing programing rules
  	 *	for ICH controllers.
  	 */

  
  	static const	 /* ISP  RTC */
  	u8 timings[][2]	= { { 0, 0 },
  			    { 0, 0 },
  			    { 1, 0 },
  			    { 2, 1 },
  			    { 2, 3 }, };

  	if (pio >= 2)
  		control |= 1;	/* TIME1 enable */
  	if (ata_pio_need_iordy(adev))
  		control |= 2;	/* IE enable */

  	/* Intel specifies that the PPE functionality is for disk only */

  	if (adev->class == ATA_DEV_ATA)
  		control |= 4;	/* PPE enable */

  	spin_lock_irqsave(&piix_lock, flags);

  	/* PIO configuration clears DTE unconditionally.  It will be
  	 * programmed in set_dmamode which is guaranteed to be called
  	 * after set_piomode if any DMA mode is available.
  	 */

  	pci_read_config_word(dev, master_port, &master_data);
  	if (is_slave) {

  		/* clear TIME1|IE1|PPE1|DTE1 */
  		master_data &= 0xff0f;

  		/* Enable SITRE (separate slave timing register) */

  		master_data |= 0x4000;

  		/* enable PPE1, IE1 and TIME1 as needed */
  		master_data |= (control << 4);

  		pci_read_config_byte(dev, slave_port, &slave_data);

  		slave_data &= (ap->port_no ? 0x0f : 0xf0);

  		/* Load the timing nibble for this slave */

  		slave_data |= ((timings[pio][0] << 2) | timings[pio][1])
  						<< (ap->port_no ? 4 : 0);

  	} else {

  		/* clear ISP|RCT|TIME0|IE0|PPE0|DTE0 */
  		master_data &= 0xccf0;

  		/* Enable PPE, IE and TIME as appropriate */
  		master_data |= control;

  		/* load ISP and RCT */

  		master_data |=
  			(timings[pio][0] << 12) |
  			(timings[pio][1] << 8);
  	}
  	pci_write_config_word(dev, master_port, master_data);
  	if (is_slave)
  		pci_write_config_byte(dev, slave_port, slave_data);

  
  	/* Ensure the UDMA bit is off - it will be turned back on if
  	   UDMA is selected */

  	if (ap->udma_mask) {
  		pci_read_config_byte(dev, 0x48, &udma_enable);
  		udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
  		pci_write_config_byte(dev, 0x48, udma_enable);
  	}

  
  	spin_unlock_irqrestore(&piix_lock, flags);

  }
  
  /**

   *	do_pata_set_dmamode - Initialize host controller PATA PIO timings

   *	@ap: Port whose timings we are configuring

   *	@adev: Drive in question

   *	@isich: set if the chip is an ICH device

   *
   *	Set UDMA mode for device, in host controller PCI config space.
   *
   *	LOCKING:
   *	None (inherited from caller).
   */

  static void do_pata_set_dmamode(struct ata_port *ap, struct ata_device *adev, int isich)

  {

  	struct pci_dev *dev	= to_pci_dev(ap->host->dev);

  	unsigned long flags;

  	u8 master_port		= ap->port_no ? 0x42 : 0x40;
  	u16 master_data;
  	u8 speed		= adev->dma_mode;
  	int devid		= adev->devno + 2 * ap->port_no;

  	u8 udma_enable		= 0;

  	static const	 /* ISP  RTC */
  	u8 timings[][2]	= { { 0, 0 },
  			    { 0, 0 },
  			    { 1, 0 },
  			    { 2, 1 },
  			    { 2, 3 }, };

  	spin_lock_irqsave(&piix_lock, flags);

  	pci_read_config_word(dev, master_port, &master_data);

  	if (ap->udma_mask)
  		pci_read_config_byte(dev, 0x48, &udma_enable);

  
  	if (speed >= XFER_UDMA_0) {

  		unsigned int udma = adev->dma_mode - XFER_UDMA_0;
  		u16 udma_timing;
  		u16 ideconf;
  		int u_clock, u_speed;

  		/*

  		 * UDMA is handled by a combination of clock switching and

  		 * selection of dividers
  		 *

  		 * Handy rule: Odd modes are UDMATIMx 01, even are 02

  		 *	       except UDMA0 which is 00

  		 */
  		u_speed = min(2 - (udma & 1), udma);
  		if (udma == 5)
  			u_clock = 0x1000;	/* 100Mhz */
  		else if (udma > 2)
  			u_clock = 1;		/* 66Mhz */
  		else
  			u_clock = 0;		/* 33Mhz */

  		udma_enable |= (1 << devid);

  		/* Load the CT/RP selection */
  		pci_read_config_word(dev, 0x4A, &udma_timing);
  		udma_timing &= ~(3 << (4 * devid));
  		udma_timing |= u_speed << (4 * devid);
  		pci_write_config_word(dev, 0x4A, udma_timing);

  		if (isich) {

  			/* Select a 33/66/100Mhz clock */
  			pci_read_config_word(dev, 0x54, &ideconf);
  			ideconf &= ~(0x1001 << devid);
  			ideconf |= u_clock << devid;
  			/* For ICH or later we should set bit 10 for better
  			   performance (WR_PingPong_En) */
  			pci_write_config_word(dev, 0x54, ideconf);

  		}

  	} else {

  		/*
  		 * MWDMA is driven by the PIO timings. We must also enable
  		 * IORDY unconditionally along with TIME1. PPE has already
  		 * been set when the PIO timing was set.
  		 */
  		unsigned int mwdma	= adev->dma_mode - XFER_MW_DMA_0;
  		unsigned int control;
  		u8 slave_data;
  		const unsigned int needed_pio[3] = {
  			XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
  		};
  		int pio = needed_pio[mwdma] - XFER_PIO_0;

  		control = 3;	/* IORDY|TIME1 */

  		/* If the drive MWDMA is faster than it can do PIO then
  		   we must force PIO into PIO0 */

  		if (adev->pio_mode < needed_pio[mwdma])
  			/* Enable DMA timing only */
  			control |= 8;	/* PIO cycles in PIO0 */
  
  		if (adev->devno) {	/* Slave */
  			master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
  			master_data |= control << 4;
  			pci_read_config_byte(dev, 0x44, &slave_data);

  			slave_data &= (ap->port_no ? 0x0f : 0xf0);

  			/* Load the matching timing */
  			slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
  			pci_write_config_byte(dev, 0x44, slave_data);
  		} else { 	/* Master */

  			master_data &= 0xCCF4;	/* Mask out IORDY|TIME1|DMAONLY

  						   and master timing bits */
  			master_data |= control;
  			master_data |=
  				(timings[pio][0] << 12) |
  				(timings[pio][1] << 8);
  		}

  		if (ap->udma_mask)

  			udma_enable &= ~(1 << devid);

  
  		pci_write_config_word(dev, master_port, master_data);

  	}

  	/* Don't scribble on 0x48 if the controller does not support UDMA */
  	if (ap->udma_mask)
  		pci_write_config_byte(dev, 0x48, udma_enable);

  
  	spin_unlock_irqrestore(&piix_lock, flags);

  }
  
  /**
   *	piix_set_dmamode - Initialize host controller PATA DMA timings
   *	@ap: Port whose timings we are configuring
   *	@adev: um
   *
   *	Set MW/UDMA mode for device, in host controller PCI config space.
   *
   *	LOCKING:
   *	None (inherited from caller).
   */

  static void piix_set_dmamode(struct ata_port *ap, struct ata_device *adev)

  {
  	do_pata_set_dmamode(ap, adev, 0);
  }
  
  /**
   *	ich_set_dmamode - Initialize host controller PATA DMA timings
   *	@ap: Port whose timings we are configuring
   *	@adev: um
   *
   *	Set MW/UDMA mode for device, in host controller PCI config space.
   *
   *	LOCKING:
   *	None (inherited from caller).
   */

  static void ich_set_dmamode(struct ata_port *ap, struct ata_device *adev)

  {
  	do_pata_set_dmamode(ap, adev, 1);

  }

  /*
   * Serial ATA Index/Data Pair Superset Registers access
   *
   * Beginning from ICH8, there's a sane way to access SCRs using index

   * and data register pair located at BAR5 which means that we have
   * separate SCRs for master and slave.  This is handled using libata
   * slave_link facility.

   */
  static const int piix_sidx_map[] = {
  	[SCR_STATUS]	= 0,
  	[SCR_ERROR]	= 2,
  	[SCR_CONTROL]	= 1,
  };

  static void piix_sidpr_sel(struct ata_link *link, unsigned int reg)

  {

  	struct ata_port *ap = link->ap;

  	struct piix_host_priv *hpriv = ap->host->private_data;

  	iowrite32(((ap->port_no * 2 + link->pmp) << 8) | piix_sidx_map[reg],

  		  hpriv->sidpr + PIIX_SIDPR_IDX);
  }

  static int piix_sidpr_scr_read(struct ata_link *link,
  			       unsigned int reg, u32 *val)

  {

  	struct piix_host_priv *hpriv = link->ap->host->private_data;

  	unsigned long flags;

  
  	if (reg >= ARRAY_SIZE(piix_sidx_map))
  		return -EINVAL;

  	spin_lock_irqsave(&hpriv->sidpr_lock, flags);

  	piix_sidpr_sel(link, reg);
  	*val = ioread32(hpriv->sidpr + PIIX_SIDPR_DATA);

  	spin_unlock_irqrestore(&hpriv->sidpr_lock, flags);

  	return 0;
  }

  static int piix_sidpr_scr_write(struct ata_link *link,
  				unsigned int reg, u32 val)

  {

  	struct piix_host_priv *hpriv = link->ap->host->private_data;

  	unsigned long flags;

  	if (reg >= ARRAY_SIZE(piix_sidx_map))
  		return -EINVAL;

  	spin_lock_irqsave(&hpriv->sidpr_lock, flags);

  	piix_sidpr_sel(link, reg);
  	iowrite32(val, hpriv->sidpr + PIIX_SIDPR_DATA);

  	spin_unlock_irqrestore(&hpriv->sidpr_lock, flags);

  	return 0;
  }

  static bool piix_irq_check(struct ata_port *ap)
  {
  	if (unlikely(!ap->ioaddr.bmdma_addr))
  		return false;
  
  	return ap->ops->bmdma_status(ap) & ATA_DMA_INTR;
  }

  #ifdef CONFIG_PM

  static int piix_broken_suspend(void)
  {

  	static const struct dmi_system_id sysids[] = {

  		{

  			.ident = "TECRA M3",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "TECRA M3"),
  			},
  		},
  		{

  			.ident = "TECRA M3",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "Tecra M3"),
  			},
  		},
  		{

  			.ident = "TECRA M4",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "Tecra M4"),
  			},
  		},
  		{

  			.ident = "TECRA M4",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "TECRA M4"),
  			},
  		},
  		{

  			.ident = "TECRA M5",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "TECRA M5"),
  			},

  		},

  		{

  			.ident = "TECRA M6",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "TECRA M6"),
  			},
  		},
  		{

  			.ident = "TECRA M7",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "TECRA M7"),
  			},
  		},
  		{

  			.ident = "TECRA A8",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A8"),
  			},
  		},
  		{

  			.ident = "Satellite R20",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "Satellite R20"),
  			},
  		},
  		{

  			.ident = "Satellite R25",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "Satellite R25"),
  			},
  		},
  		{

  			.ident = "Satellite U200",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "Satellite U200"),
  			},
  		},
  		{

  			.ident = "Satellite U200",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE U200"),
  			},
  		},
  		{

  			.ident = "Satellite Pro U200",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE PRO U200"),
  			},
  		},
  		{

  			.ident = "Satellite U205",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "Satellite U205"),
  			},

  		},

  		{

  			.ident = "SATELLITE U205",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE U205"),
  			},
  		},
  		{

  			.ident = "Portege M500",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE M500"),
  			},

  		},

  		{
  			.ident = "VGN-BX297XP",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "VGN-BX297XP"),
  			},
  		},

  
  		{ }	/* terminate list */

  	};

  	static const char *oemstrs[] = {
  		"Tecra M3,",
  	};
  	int i;

  
  	if (dmi_check_system(sysids))
  		return 1;

  	for (i = 0; i < ARRAY_SIZE(oemstrs); i++)
  		if (dmi_find_device(DMI_DEV_TYPE_OEM_STRING, oemstrs[i], NULL))
  			return 1;

  	/* TECRA M4 sometimes forgets its identify and reports bogus
  	 * DMI information.  As the bogus information is a bit
  	 * generic, match as many entries as possible.  This manual
  	 * matching is necessary because dmi_system_id.matches is
  	 * limited to four entries.
  	 */

  	if (dmi_match(DMI_SYS_VENDOR, "TOSHIBA") &&
  	    dmi_match(DMI_PRODUCT_NAME, "000000") &&
  	    dmi_match(DMI_PRODUCT_VERSION, "000000") &&
  	    dmi_match(DMI_PRODUCT_SERIAL, "000000") &&
  	    dmi_match(DMI_BOARD_VENDOR, "TOSHIBA") &&
  	    dmi_match(DMI_BOARD_NAME, "Portable PC") &&
  	    dmi_match(DMI_BOARD_VERSION, "Version A0"))

  		return 1;

  	return 0;
  }

  
  static int piix_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
  {
  	struct ata_host *host = dev_get_drvdata(&pdev->dev);
  	unsigned long flags;
  	int rc = 0;
  
  	rc = ata_host_suspend(host, mesg);
  	if (rc)
  		return rc;
  
  	/* Some braindamaged ACPI suspend implementations expect the
  	 * controller to be awake on entry; otherwise, it burns cpu
  	 * cycles and power trying to do something to the sleeping
  	 * beauty.
  	 */

  	if (piix_broken_suspend() && (mesg.event & PM_EVENT_SLEEP)) {

  		pci_save_state(pdev);
  
  		/* mark its power state as "unknown", since we don't
  		 * know if e.g. the BIOS will change its device state
  		 * when we suspend.
  		 */
  		if (pdev->current_state == PCI_D0)
  			pdev->current_state = PCI_UNKNOWN;
  
  		/* tell resume that it's waking up from broken suspend */
  		spin_lock_irqsave(&host->lock, flags);
  		host->flags |= PIIX_HOST_BROKEN_SUSPEND;
  		spin_unlock_irqrestore(&host->lock, flags);
  	} else
  		ata_pci_device_do_suspend(pdev, mesg);
  
  	return 0;
  }
  
  static int piix_pci_device_resume(struct pci_dev *pdev)
  {
  	struct ata_host *host = dev_get_drvdata(&pdev->dev);
  	unsigned long flags;
  	int rc;
  
  	if (host->flags & PIIX_HOST_BROKEN_SUSPEND) {
  		spin_lock_irqsave(&host->lock, flags);
  		host->flags &= ~PIIX_HOST_BROKEN_SUSPEND;
  		spin_unlock_irqrestore(&host->lock, flags);
  
  		pci_set_power_state(pdev, PCI_D0);
  		pci_restore_state(pdev);
  
  		/* PCI device wasn't disabled during suspend.  Use

  		 * pci_reenable_device() to avoid affecting the enable
  		 * count.

  		 */

  		rc = pci_reenable_device(pdev);

  		if (rc)
  			dev_printk(KERN_ERR, &pdev->dev, "failed to enable "
  				   "device after resume (%d)
  ", rc);
  	} else
  		rc = ata_pci_device_do_resume(pdev);
  
  	if (rc == 0)
  		ata_host_resume(host);
  
  	return rc;
  }
  #endif

  static u8 piix_vmw_bmdma_status(struct ata_port *ap)
  {
  	return ata_bmdma_status(ap) & ~ATA_DMA_ERR;
  }

  #define AHCI_PCI_BAR 5
  #define AHCI_GLOBAL_CTL 0x04
  #define AHCI_ENABLE (1 << 31)
  static int piix_disable_ahci(struct pci_dev *pdev)
  {

  	void __iomem *mmio;

  	u32 tmp;
  	int rc = 0;
  
  	/* BUG: pci_enable_device has not yet been called.  This
  	 * works because this device is usually set up by BIOS.
  	 */

  	if (!pci_resource_start(pdev, AHCI_PCI_BAR) ||
  	    !pci_resource_len(pdev, AHCI_PCI_BAR))

  		return 0;

  	mmio = pci_iomap(pdev, AHCI_PCI_BAR, 64);

  	if (!mmio)
  		return -ENOMEM;

  	tmp = ioread32(mmio + AHCI_GLOBAL_CTL);

  	if (tmp & AHCI_ENABLE) {
  		tmp &= ~AHCI_ENABLE;

  		iowrite32(tmp, mmio + AHCI_GLOBAL_CTL);

  		tmp = ioread32(mmio + AHCI_GLOBAL_CTL);

  		if (tmp & AHCI_ENABLE)
  			rc = -EIO;
  	}

  	pci_iounmap(pdev, mmio);

  	return rc;
  }
  
  /**

   *	piix_check_450nx_errata	-	Check for problem 450NX setup

   *	@ata_dev: the PCI device to check

   *

   *	Check for the present of 450NX errata #19 and errata #25. If
   *	they are found return an error code so we can turn off DMA
   */
  
  static int __devinit piix_check_450nx_errata(struct pci_dev *ata_dev)
  {
  	struct pci_dev *pdev = NULL;
  	u16 cfg;

  	int no_piix_dma = 0;

  	while ((pdev = pci_get_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454NX, pdev)) != NULL) {

  		/* Look for 450NX PXB. Check for problem configurations
  		   A PCI quirk checks bit 6 already */

  		pci_read_config_word(pdev, 0x41, &cfg);
  		/* Only on the original revision: IDE DMA can hang */

  		if (pdev->revision == 0x00)

  			no_piix_dma = 1;
  		/* On all revisions below 5 PXB bus lock must be disabled for IDE */

  		else if (cfg & (1<<14) && pdev->revision < 5)

  			no_piix_dma = 2;
  	}

  	if (no_piix_dma)

  		dev_printk(KERN_WARNING, &ata_dev->dev, "450NX errata present, disabling IDE DMA.
  ");

  	if (no_piix_dma == 2)

  		dev_printk(KERN_WARNING, &ata_dev->dev, "A BIOS update may resolve this.
  ");
  	return no_piix_dma;

  }

  static void __devinit piix_init_pcs(struct ata_host *host,

  				    const struct piix_map_db *map_db)
  {

  	struct pci_dev *pdev = to_pci_dev(host->dev);

  	u16 pcs, new_pcs;
  
  	pci_read_config_word(pdev, ICH5_PCS, &pcs);
  
  	new_pcs = pcs | map_db->port_enable;
  
  	if (new_pcs != pcs) {
  		DPRINTK("updating PCS from 0x%x to 0x%x
  ", pcs, new_pcs);
  		pci_write_config_word(pdev, ICH5_PCS, new_pcs);
  		msleep(150);
  	}
  }

  static const int *__devinit piix_init_sata_map(struct pci_dev *pdev,
  					       struct ata_port_info *pinfo,
  					       const struct piix_map_db *map_db)

  {

  	const int *map;

  	int i, invalid_map = 0;
  	u8 map_value;
  
  	pci_read_config_byte(pdev, ICH5_PMR, &map_value);
  
  	map = map_db->map[map_value & map_db->mask];
  
  	dev_printk(KERN_INFO, &pdev->dev, "MAP [");
  	for (i = 0; i < 4; i++) {
  		switch (map[i]) {
  		case RV:
  			invalid_map = 1;
  			printk(" XX");
  			break;
  
  		case NA:
  			printk(" --");
  			break;
  
  		case IDE:
  			WARN_ON((i & 1) || map[i + 1] != IDE);

  			pinfo[i / 2] = piix_port_info[ich_pata_100];

  			i++;
  			printk(" IDE IDE");
  			break;
  
  		default:
  			printk(" P%d", map[i]);
  			if (i & 1)

  				pinfo[i / 2].flags |= ATA_FLAG_SLAVE_POSS;

  			break;
  		}
  	}
  	printk(" ]
  ");
  
  	if (invalid_map)
  		dev_printk(KERN_ERR, &pdev->dev,
  			   "invalid MAP value %u
  ", map_value);

  	return map;

  }

  static bool piix_no_sidpr(struct ata_host *host)
  {
  	struct pci_dev *pdev = to_pci_dev(host->dev);
  
  	/*
  	 * Samsung DB-P70 only has three ATA ports exposed and
  	 * curiously the unconnected first port reports link online
  	 * while not responding to SRST protocol causing excessive
  	 * detection delay.
  	 *
  	 * Unfortunately, the system doesn't carry enough DMI
  	 * information to identify the machine but does have subsystem
  	 * vendor and device set.  As it's unclear whether the
  	 * subsystem vendor/device is used only for this specific
  	 * board, the port can't be disabled solely with the
  	 * information; however, turning off SIDPR access works around
  	 * the problem.  Turn it off.
  	 *
  	 * This problem is reported in bnc#441240.
  	 *
  	 * https://bugzilla.novell.com/show_bug.cgi?id=441420
  	 */
  	if (pdev->vendor == PCI_VENDOR_ID_INTEL && pdev->device == 0x2920 &&
  	    pdev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG &&
  	    pdev->subsystem_device == 0xb049) {
  		dev_printk(KERN_WARNING, host->dev,
  			   "Samsung DB-P70 detected, disabling SIDPR
  ");
  		return true;
  	}
  
  	return false;
  }

  static int __devinit piix_init_sidpr(struct ata_host *host)

  {
  	struct pci_dev *pdev = to_pci_dev(host->dev);
  	struct piix_host_priv *hpriv = host->private_data;

  	struct ata_link *link0 = &host->ports[0]->link;

  	u32 scontrol;

  	int i, rc;

  
  	/* check for availability */
  	for (i = 0; i < 4; i++)
  		if (hpriv->map[i] == IDE)

  			return 0;

  	/* is it blacklisted? */
  	if (piix_no_sidpr(host))
  		return 0;

  	if (!(host->ports[0]->flags & PIIX_FLAG_SIDPR))

  		return 0;

  
  	if (pci_resource_start(pdev, PIIX_SIDPR_BAR) == 0 ||
  	    pci_resource_len(pdev, PIIX_SIDPR_BAR) != PIIX_SIDPR_LEN)

  		return 0;

  
  	if (pcim_iomap_regions(pdev, 1 << PIIX_SIDPR_BAR, DRV_NAME))

  		return 0;

  
  	hpriv->sidpr = pcim_iomap_table(pdev)[PIIX_SIDPR_BAR];

  
  	/* SCR access via SIDPR doesn't work on some configurations.
  	 * Give it a test drive by inhibiting power save modes which
  	 * we'll do anyway.
  	 */

  	piix_sidpr_scr_read(link0, SCR_CONTROL, &scontrol);

  
  	/* if IPM is already 3, SCR access is probably working.  Don't
  	 * un-inhibit power save modes as BIOS might have inhibited
  	 * them for a reason.
  	 */
  	if ((scontrol & 0xf00) != 0x300) {
  		scontrol |= 0x300;

  		piix_sidpr_scr_write(link0, SCR_CONTROL, scontrol);
  		piix_sidpr_scr_read(link0, SCR_CONTROL, &scontrol);

  
  		if ((scontrol & 0xf00) != 0x300) {
  			dev_printk(KERN_INFO, host->dev, "SCR access via "
  				   "SIDPR is available but doesn't work
  ");

  			return 0;

  		}
  	}

  	/* okay, SCRs available, set ops and ask libata for slave_link */
  	for (i = 0; i < 2; i++) {
  		struct ata_port *ap = host->ports[i];
  
  		ap->ops = &piix_sidpr_sata_ops;
  
  		if (ap->flags & ATA_FLAG_SLAVE_POSS) {
  			rc = ata_slave_link_init(ap);
  			if (rc)
  				return rc;
  		}
  	}
  
  	return 0;

  }

  static void piix_iocfg_bit18_quirk(struct ata_host *host)

  {

  	static const struct dmi_system_id sysids[] = {

  		{
  			/* Clevo M570U sets IOCFG bit 18 if the cdrom
  			 * isn't used to boot the system which
  			 * disables the channel.
  			 */
  			.ident = "M570U",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "Clevo Co."),
  				DMI_MATCH(DMI_PRODUCT_NAME, "M570U"),
  			},
  		},

  
  		{ }	/* terminate list */

  	};

  	struct pci_dev *pdev = to_pci_dev(host->dev);
  	struct piix_host_priv *hpriv = host->private_data;

  
  	if (!dmi_check_system(sysids))
  		return;
  
  	/* The datasheet says that bit 18 is NOOP but certain systems
  	 * seem to use it to disable a channel.  Clear the bit on the
  	 * affected systems.
  	 */

  	if (hpriv->saved_iocfg & (1 << 18)) {

  		dev_printk(KERN_INFO, &pdev->dev,
  			   "applying IOCFG bit18 quirk
  ");

  		pci_write_config_dword(pdev, PIIX_IOCFG,
  				       hpriv->saved_iocfg & ~(1 << 18));

  	}
  }

  static bool piix_broken_system_poweroff(struct pci_dev *pdev)
  {
  	static const struct dmi_system_id broken_systems[] = {
  		{
  			.ident = "HP Compaq 2510p",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 2510p"),
  			},
  			/* PCI slot number of the controller */
  			.driver_data = (void *)0x1FUL,
  		},

  		{
  			.ident = "HP Compaq nc6000",
  			.matches = {
  				DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
  				DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nc6000"),
  			},
  			/* PCI slot number of the controller */
  			.driver_data = (void *)0x1FUL,
  		},

  
  		{ }	/* terminate list */
  	};
  	const struct dmi_system_id *dmi = dmi_first_match(broken_systems);
  
  	if (dmi) {
  		unsigned long slot = (unsigned long)dmi->driver_data;
  		/* apply the quirk only to on-board controllers */
  		return slot == PCI_SLOT(pdev->devfn);
  	}
  
  	return false;
  }

  /**

   *	piix_init_one - Register PIIX ATA PCI device with kernel services
   *	@pdev: PCI device to register
   *	@ent: Entry in piix_pci_tbl matching with @pdev
   *
   *	Called from kernel PCI layer.  We probe for combined mode (sigh),
   *	and then hand over control to libata, for it to do the rest.
   *
   *	LOCKING:
   *	Inherited from PCI layer (may sleep).
   *
   *	RETURNS:
   *	Zero on success, or -ERRNO value.
   */

  static int __devinit piix_init_one(struct pci_dev *pdev,
  				   const struct pci_device_id *ent)

  {
  	static int printed_version;

  	struct device *dev = &pdev->dev;

  	struct ata_port_info port_info[2];

  	const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] };

  	unsigned long port_flags;

  	struct ata_host *host;
  	struct piix_host_priv *hpriv;
  	int rc;

  
  	if (!printed_version++)

  		dev_printk(KERN_DEBUG, &pdev->dev,
  			   "version " DRV_VERSION "
  ");

  	/* no hotplugging support for later devices (FIXME) */
  	if (!in_module_init && ent->driver_data >= ich5_sata)

  		return -ENODEV;

  	if (piix_broken_system_poweroff(pdev)) {
  		piix_port_info[ent->driver_data].flags |=
  				ATA_FLAG_NO_POWEROFF_SPINDOWN |
  					ATA_FLAG_NO_HIBERNATE_SPINDOWN;
  		dev_info(&pdev->dev, "quirky BIOS, skipping spindown "
  				"on poweroff and hibernation
  ");
  	}

  	port_info[0] = piix_port_info[ent->driver_data];
  	port_info[1] = piix_port_info[ent->driver_data];
  
  	port_flags = port_info[0].flags;
  
  	/* enable device and prepare host */
  	rc = pcim_enable_device(pdev);
  	if (rc)
  		return rc;

  	hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
  	if (!hpriv)
  		return -ENOMEM;

  	spin_lock_init(&hpriv->sidpr_lock);

  
  	/* Save IOCFG, this will be used for cable detection, quirk
  	 * detection and restoration on detach.  This is necessary
  	 * because some ACPI implementations mess up cable related
  	 * bits on _STM.  Reported on kernel bz#11879.
  	 */
  	pci_read_config_dword(pdev, PIIX_IOCFG, &hpriv->saved_iocfg);

  	/* ICH6R may be driven by either ata_piix or ahci driver
  	 * regardless of BIOS configuration.  Make sure AHCI mode is
  	 * off.
  	 */
  	if (pdev->vendor == PCI_VENDOR_ID_INTEL && pdev->device == 0x2652) {

  		rc = piix_disable_ahci(pdev);

  		if (rc)
  			return rc;
  	}

  	/* SATA map init can change port_info, do it before prepping host */

  	if (port_flags & ATA_FLAG_SATA)
  		hpriv->map = piix_init_sata_map(pdev, port_info,
  					piix_map_db_table[ent->driver_data]);

  	rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);

  	if (rc)
  		return rc;
  	host->private_data = hpriv;

  	/* initialize controller */

  	if (port_flags & ATA_FLAG_SATA) {

  		piix_init_pcs(host, piix_map_db_table[ent->driver_data]);

  		rc = piix_init_sidpr(host);
  		if (rc)
  			return rc;

  	}

  	/* apply IOCFG bit18 quirk */

  	piix_iocfg_bit18_quirk(host);

  	/* On ICH5, some BIOSen disable the interrupt using the
  	 * PCI_COMMAND_INTX_DISABLE bit added in PCI 2.3.
  	 * On ICH6, this bit has the same effect, but only when
  	 * MSI is disabled (and it is disabled, as we don't use
  	 * message-signalled interrupts currently).
  	 */

  	if (port_flags & PIIX_FLAG_CHECKINTR)

  		pci_intx(pdev, 1);

  	if (piix_check_450nx_errata(pdev)) {
  		/* This writes into the master table but it does not
  		   really matter for this errata as we will apply it to
  		   all the PIIX devices on the board */

  		host->ports[0]->mwdma_mask = 0;
  		host->ports[0]->udma_mask = 0;
  		host->ports[1]->mwdma_mask = 0;
  		host->ports[1]->udma_mask = 0;

  	}

  	host->flags |= ATA_HOST_PARALLEL_SCAN;

  
  	pci_set_master(pdev);

  	return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, &piix_sht);

  }

  static void piix_remove_one(struct pci_dev *pdev)
  {
  	struct ata_host *host = dev_get_drvdata(&pdev->dev);
  	struct piix_host_priv *hpriv = host->private_data;
  
  	pci_write_config_dword(pdev, PIIX_IOCFG, hpriv->saved_iocfg);
  
  	ata_pci_remove_one(pdev);
  }

  static int __init piix_init(void)
  {
  	int rc;

  	DPRINTK("pci_register_driver
  ");
  	rc = pci_register_driver(&piix_pci_driver);

  	if (rc)
  		return rc;
  
  	in_module_init = 0;
  
  	DPRINTK("done
  ");
  	return 0;
  }

  static void __exit piix_exit(void)
  {
  	pci_unregister_driver(&piix_pci_driver);
  }
  
  module_init(piix_init);
  module_exit(piix_exit);