/*
 *    ata_piix.c - Intel PATA/SATA controllers
 *
 *    Maintained by:  Tejun Heo <tj@kernel.org>
 *                  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/driver-api/libata.rst
 *
 *  Hardware documentation available at http://developer.intel.com/
 *
 * Documentation
 *      Publicly available from Intel web site. Errata documentation
 * is also publicly 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 independent 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 independent 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, /* address map 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_FLAG_PIO16         = (1 << 30), /*support 16bit PIO only*/

        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 available */
        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 */
        ich8_sata_snb,
        ich8_2port_sata_snb,
        ich8_2port_sata_byt,
};

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;
        void __iomem *sidpr;
};

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-L */
        { 0x8086, 0x24C1, 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 },
        /* 82801GBM/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_snb },
        /* SATA Controller IDE (CPT) */
        { 0x8086, 0x1c01, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* 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 },
        /* SATA Controller IDE (PBG) */
        { 0x8086, 0x1d00, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (PBG) */
        { 0x8086, 0x1d08, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
        /* SATA Controller IDE (Panther Point) */
        { 0x8086, 0x1e00, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (Panther Point) */
        { 0x8086, 0x1e01, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (Panther Point) */
        { 0x8086, 0x1e08, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
        /* SATA Controller IDE (Panther Point) */
        { 0x8086, 0x1e09, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
        /* SATA Controller IDE (Lynx Point) */
        { 0x8086, 0x8c00, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (Lynx Point) */
        { 0x8086, 0x8c01, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (Lynx Point) */
        { 0x8086, 0x8c08, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata_snb },
        /* SATA Controller IDE (Lynx Point) */
        { 0x8086, 0x8c09, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
        /* SATA Controller IDE (Lynx Point-LP) */
        { 0x8086, 0x9c00, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (Lynx Point-LP) */
        { 0x8086, 0x9c01, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (Lynx Point-LP) */
        { 0x8086, 0x9c08, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
        /* SATA Controller IDE (Lynx Point-LP) */
        { 0x8086, 0x9c09, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
        /* SATA Controller IDE (DH89xxCC) */
        { 0x8086, 0x2326, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
        /* SATA Controller IDE (Avoton) */
        { 0x8086, 0x1f20, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (Avoton) */
        { 0x8086, 0x1f21, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (Avoton) */
        { 0x8086, 0x1f30, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
        /* SATA Controller IDE (Avoton) */
        { 0x8086, 0x1f31, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
        /* SATA Controller IDE (Wellsburg) */
        { 0x8086, 0x8d00, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (Wellsburg) */
        { 0x8086, 0x8d08, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata_snb },
        /* SATA Controller IDE (Wellsburg) */
        { 0x8086, 0x8d60, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (Wellsburg) */
        { 0x8086, 0x8d68, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
        /* SATA Controller IDE (BayTrail) */
        { 0x8086, 0x0F20, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata_byt },
        { 0x8086, 0x0F21, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata_byt },
        /* SATA Controller IDE (Coleto Creek) */
        { 0x8086, 0x23a6, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
        /* SATA Controller IDE (9 Series) */
        { 0x8086, 0x8c88, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata_snb },
        /* SATA Controller IDE (9 Series) */
        { 0x8086, 0x8c89, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata_snb },
        /* SATA Controller IDE (9 Series) */
        { 0x8086, 0x8c80, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
        /* SATA Controller IDE (9 Series) */
        { 0x8086, 0x8c81, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },

        { }     /* terminate list */
};

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,
        [ich8_sata_snb]         = &ich8_map_db,
        [ich8_2port_sata_snb]   = &ich8_2port_map_db,
        [ich8_2port_sata_byt]   = &ich8_2port_map_db,
};

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 */
        { 0x24CA, 0x10CF, 0x11AB },     /* ICH4M on Fujitsu-Siemens Lifebook S6120 */
        { 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, }
};

static int piix_port_start(struct ata_port *ap)
{
        if (!(ap->flags & PIIX_FLAG_PIO16))
                ap->pflags |= ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32CHANGE;

        return ata_bmdma_port_start(ap);
}

/**
 *      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 */
        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);

static void piix_set_timings(struct ata_port *ap, struct ata_device *adev,
                             u8 pio)
{
        struct pci_dev *dev     = to_pci_dev(ap->host->dev);
        unsigned long flags;
        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 */
        /*
         * If the drive MWDMA is faster than it can do PIO then
         * we must force PIO into PIO0
         */
        if (adev->pio_mode < XFER_PIO_0 + pio)
                /* Enable DMA timing only */
                control |= 8;   /* PIO cycles in PIO0 */

        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 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);
        }

        /* Enable SITRE (separate slave timing register) */
        master_data |= 0x4000;
        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);
}

/**
 *      piix_set_piomode - Initialize host controller PATA PIO timings
 *      @ap: Port whose timings we are configuring
 *      @adev: Drive in question
 *
 *      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)
{
        piix_set_timings(ap, adev, adev->pio_mode - XFER_PIO_0);
}

/**
 *      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 speed                = adev->dma_mode;
        int devid               = adev->devno + 2 * ap->port_no;
        u8 udma_enable          = 0;

        if (speed >= XFER_UDMA_0) {
                unsigned int udma = speed - XFER_UDMA_0;
                u16 udma_timing;
                u16 ideconf;
                int u_clock, u_speed;

                spin_lock_irqsave(&piix_lock, flags);

                pci_read_config_byte(dev, 0x48, &udma_enable);

                /*
                 * 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);
                }

                pci_write_config_byte(dev, 0x48, udma_enable);

                spin_unlock_irqrestore(&piix_lock, flags);
        } else {
                /* MWDMA is driven by the PIO timings. */
                unsigned int mwdma = speed - XFER_MW_DMA_0;
                const unsigned int needed_pio[3] = {
                        XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
                };
                int pio = needed_pio[mwdma] - XFER_PIO_0;

                /* XFER_PIO_0 is never used currently */
                piix_set_timings(ap, adev, pio);
        }
}

/**
 *      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;

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

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

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

        piix_sidpr_sel(link, reg);
        iowrite32(val, hpriv->sidpr + PIIX_SIDPR_DATA);
        return 0;
}

static int piix_sidpr_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
                              unsigned hints)
{
        return sata_link_scr_lpm(link, policy, false);
}

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_SLEEP
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 = "Satellite Pro A120",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
                                DMI_MATCH(DMI_PRODUCT_NAME, "Satellite Pro A120"),
                        },
                },
                {
                        .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 = pci_get_drvdata(pdev);
        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 = pci_get_drvdata(pdev);
        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_err(&pdev->dev,
                                "failed to enable device after resume (%d)\n",
                                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;
}

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,
        .port_start             = piix_port_start,
};

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 device_attribute *piix_sidpr_shost_attrs[] = {
        &dev_attr_link_power_management_policy,
        NULL
};

static struct scsi_host_template piix_sidpr_sht = {
        ATA_BMDMA_SHT(DRV_NAME),
        .shost_attrs            = piix_sidpr_shost_attrs,
};

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,
        .set_lpm                = piix_sidpr_set_lpm,
};

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,
        },

        /*
         * some Sandybridge chipsets have broken 32 mode up to now,
         * see https://bugzilla.kernel.org/show_bug.cgi?id=40592
         */
        [ich8_sata_snb] =
        {
                .flags          = PIIX_SATA_FLAGS | PIIX_FLAG_SIDPR | PIIX_FLAG_PIO16,
                .pio_mask       = ATA_PIO4,
                .mwdma_mask     = ATA_MWDMA2,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &piix_sata_ops,
        },

        [ich8_2port_sata_snb] =
        {
                .flags          = PIIX_SATA_FLAGS | PIIX_FLAG_SIDPR
                                        | PIIX_FLAG_PIO16,
                .pio_mask       = ATA_PIO4,
                .mwdma_mask     = ATA_MWDMA2,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &piix_sata_ops,
        },

        [ich8_2port_sata_byt] =
        {
                .flags          = PIIX_SATA_FLAGS | PIIX_FLAG_SIDPR | PIIX_FLAG_PIO16,
                .pio_mask       = ATA_PIO4,
                .mwdma_mask     = ATA_MWDMA2,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &piix_sata_ops,
        },

};

#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 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_warn(&ata_dev->dev,
                         "450NX errata present, disabling IDE DMA%s\n",
                         no_piix_dma == 2 ? " - a BIOS update may resolve this"
                         : "");

        return no_piix_dma;
}

static void 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\n", pcs, new_pcs);
                pci_write_config_word(pdev, ICH5_PCS, new_pcs);
                msleep(150);
        }
}

static const int *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;
        char buf[32];
        char *p = buf, *end = buf + sizeof(buf);

        pci_read_config_byte(pdev, ICH5_PMR, &map_value);

        map = map_db->map[map_value & map_db->mask];

        for (i = 0; i < 4; i++) {
                switch (map[i]) {
                case RV:
                        invalid_map = 1;
                        p += scnprintf(p, end - p, " XX");
                        break;

                case NA:
                        p += scnprintf(p, end - p, " --");
                        break;

                case IDE:
                        WARN_ON((i & 1) || map[i + 1] != IDE);
                        pinfo[i / 2] = piix_port_info[ich_pata_100];
                        i++;
                        p += scnprintf(p, end - p, " IDE IDE");
                        break;

                default:
                        p += scnprintf(p, end - p, " P%d", map[i]);
                        if (i & 1)
                                pinfo[i / 2].flags |= ATA_FLAG_SLAVE_POSS;
                        break;
                }
        }
        dev_info(&pdev->dev, "MAP [%s ]\n", buf);

        if (invalid_map)
                dev_err(&pdev->dev, "invalid MAP value %u\n", 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_warn(host->dev,
                         "Samsung DB-P70 detected, disabling SIDPR\n");
                return true;
        }

        return false;
}

static int 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_info(host->dev,
                                 "SCR access via SIDPR is available but doesn't work\n");
                        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_info(&pdev->dev, "applying IOCFG bit18 quirk\n");
                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;
}

static int prefer_ms_hyperv = 1;
module_param(prefer_ms_hyperv, int, 0);
MODULE_PARM_DESC(prefer_ms_hyperv,
        "Prefer Hyper-V paravirtualization drivers instead of ATA, "
        "0 - Use ATA drivers, "
        "1 (Default) - Use the paravirtualization drivers.");

static void piix_ignore_devices_quirk(struct ata_host *host)
{
#if IS_ENABLED(CONFIG_HYPERV_STORAGE)
        static const struct dmi_system_id ignore_hyperv[] = {
                {
                        /* On Hyper-V hypervisors the disks are exposed on
                         * both the emulated SATA controller and on the
                         * paravirtualised drivers.  The CD/DVD devices
                         * are only exposed on the emulated controller.
                         * Request we ignore ATA devices on this host.
                         */
                        .ident = "Hyper-V Virtual Machine",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR,
                                                "Microsoft Corporation"),
                                DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
                        },
                },
                { }     /* terminate list */
        };
        static const struct dmi_system_id allow_virtual_pc[] = {
                {
                        /* In MS Virtual PC guests the DMI ident is nearly
                         * identical to a Hyper-V guest. One difference is the
                         * product version which is used here to identify
                         * a Virtual PC guest. This entry allows ata_piix to
                         * drive the emulated hardware.
                         */
                        .ident = "MS Virtual PC 2007",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR,
                                                "Microsoft Corporation"),
                                DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
                                DMI_MATCH(DMI_PRODUCT_VERSION, "VS2005R2"),
                        },
                },
                { }     /* terminate list */
        };
        const struct dmi_system_id *ignore = dmi_first_match(ignore_hyperv);
        const struct dmi_system_id *allow = dmi_first_match(allow_virtual_pc);

        if (ignore && !allow && prefer_ms_hyperv) {
                host->flags |= ATA_HOST_IGNORE_ATA;
                dev_info(host->dev, "%s detected, ATA device ignore set\n",
                        ignore->ident);
        }
#endif
}

/**
 *      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 piix_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct device *dev = &pdev->dev;
        struct ata_port_info port_info[2];
        const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] };
        struct scsi_host_template *sht = &piix_sht;
        unsigned long port_flags;
        struct ata_host *host;
        struct piix_host_priv *hpriv;
        int rc;

        ata_print_version_once(&pdev->dev, 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\n");
        }

        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;

        /* 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;
                if (host->ports[0]->ops == &piix_sidpr_sata_ops)
                        sht = &piix_sidpr_sht;
        }

        /* 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;

        /* Allow hosts to specify device types to ignore when scanning. */
        piix_ignore_devices_quirk(host);

        pci_set_master(pdev);
        return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, sht);
}

static void piix_remove_one(struct pci_dev *pdev)
{
        struct ata_host *host = pci_get_drvdata(pdev);
        struct piix_host_priv *hpriv = host->private_data;

        pci_write_config_dword(pdev, PIIX_IOCFG, hpriv->saved_iocfg);

        ata_pci_remove_one(pdev);
}

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_SLEEP
        .suspend                = piix_pci_device_suspend,
        .resume                 = piix_pci_device_resume,
#endif
};

static int __init piix_init(void)
{
        int rc;

        DPRINTK("pci_register_driver\n");
        rc = pci_register_driver(&piix_pci_driver);
        if (rc)
                return rc;

        in_module_init = 0;

        DPRINTK("done\n");
        return 0;
}

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

module_init(piix_init);
module_exit(piix_exit);