drivers/ata/ahci.h

   1 /*
   2  *  ahci.h - Common AHCI SATA definitions and declarations
   3  *
   4  *  Maintained by:  Tejun Heo <tj@kernel.org>
   5  *                  Please ALWAYS copy linux-ide@vger.kernel.org
   6  *                  on emails.
   7  *
   8  *  Copyright 2004-2005 Red Hat, Inc.
   9  *
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2, or (at your option)
  14  *  any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; see the file COPYING.  If not, write to
  23  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  *
  26  * libata documentation is available via 'make {ps|pdf}docs',
  27  * as Documentation/DocBook/libata.*
  28  *
  29  * AHCI hardware documentation:
  30  * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
  31  * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
  32  *
  33  */
  34
  35 #ifndef _AHCI_H
  36 #define _AHCI_H
  37
  38 #include <linux/clk.h>
  39 #include <linux/libata.h>
  40 #include <linux/phy/phy.h>
  41 #include <linux/regulator/consumer.h>
  42
  43 /* Enclosure Management Control */
  44 #define EM_CTRL_MSG_TYPE              0x000f0000
  45
  46 /* Enclosure Management LED Message Type */
  47 #define EM_MSG_LED_HBA_PORT           0x0000000f
  48 #define EM_MSG_LED_PMP_SLOT           0x0000ff00
  49 #define EM_MSG_LED_VALUE              0xffff0000
  50 #define EM_MSG_LED_VALUE_ACTIVITY     0x00070000
  51 #define EM_MSG_LED_VALUE_OFF          0xfff80000
  52 #define EM_MSG_LED_VALUE_ON           0x00010000
  53
  54 enum {
  55         AHCI_MAX_PORTS          = 32,
  56         AHCI_MAX_CLKS           = 5,
  57         AHCI_MAX_SG             = 168, /* hardware max is 64K */
  58         AHCI_DMA_BOUNDARY       = 0xffffffff,
  59         AHCI_MAX_CMDS           = 32,
  60         AHCI_CMD_SZ             = 32,
  61         AHCI_CMD_SLOT_SZ        = AHCI_MAX_CMDS * AHCI_CMD_SZ,
  62         AHCI_RX_FIS_SZ          = 256,
  63         AHCI_CMD_TBL_CDB        = 0x40,
  64         AHCI_CMD_TBL_HDR_SZ     = 0x80,
  65         AHCI_CMD_TBL_SZ         = AHCI_CMD_TBL_HDR_SZ + (AHCI_MAX_SG * 16),
  66         AHCI_CMD_TBL_AR_SZ      = AHCI_CMD_TBL_SZ * AHCI_MAX_CMDS,
  67         AHCI_PORT_PRIV_DMA_SZ   = AHCI_CMD_SLOT_SZ + AHCI_CMD_TBL_AR_SZ +
  68                                   AHCI_RX_FIS_SZ,
  69         AHCI_PORT_PRIV_FBS_DMA_SZ       = AHCI_CMD_SLOT_SZ +
  70                                           AHCI_CMD_TBL_AR_SZ +
  71                                           (AHCI_RX_FIS_SZ * 16),
  72         AHCI_IRQ_ON_SG          = (1 << 31),
  73         AHCI_CMD_ATAPI          = (1 << 5),
  74         AHCI_CMD_WRITE          = (1 << 6),
  75         AHCI_CMD_PREFETCH       = (1 << 7),
  76         AHCI_CMD_RESET          = (1 << 8),
  77         AHCI_CMD_CLR_BUSY       = (1 << 10),
  78
  79         RX_FIS_PIO_SETUP        = 0x20, /* offset of PIO Setup FIS data */
  80         RX_FIS_D2H_REG          = 0x40, /* offset of D2H Register FIS data */
  81         RX_FIS_SDB              = 0x58, /* offset of SDB FIS data */
  82         RX_FIS_UNK              = 0x60, /* offset of Unknown FIS data */
  83
  84         /* global controller registers */
  85         HOST_CAP                = 0x00, /* host capabilities */
  86         HOST_CTL                = 0x04, /* global host control */
  87         HOST_IRQ_STAT           = 0x08, /* interrupt status */
  88         HOST_PORTS_IMPL         = 0x0c, /* bitmap of implemented ports */
  89         HOST_VERSION            = 0x10, /* AHCI spec. version compliancy */
  90         HOST_EM_LOC             = 0x1c, /* Enclosure Management location */
  91         HOST_EM_CTL             = 0x20, /* Enclosure Management Control */
  92         HOST_CAP2               = 0x24, /* host capabilities, extended */
  93
  94         /* HOST_CTL bits */
  95         HOST_RESET              = (1 << 0),  /* reset controller; self-clear */
  96         HOST_IRQ_EN             = (1 << 1),  /* global IRQ enable */
  97         HOST_MRSM               = (1 << 2),  /* MSI Revert to Single Message */
  98         HOST_AHCI_EN            = (1 << 31), /* AHCI enabled */
  99
 100         /* HOST_CAP bits */
 101         HOST_CAP_SXS            = (1 << 5),  /* Supports External SATA */
 102         HOST_CAP_EMS            = (1 << 6),  /* Enclosure Management support */
 103         HOST_CAP_CCC            = (1 << 7),  /* Command Completion Coalescing */
 104         HOST_CAP_PART           = (1 << 13), /* Partial state capable */
 105         HOST_CAP_SSC            = (1 << 14), /* Slumber state capable */
 106         HOST_CAP_PIO_MULTI      = (1 << 15), /* PIO multiple DRQ support */
 107         HOST_CAP_FBS            = (1 << 16), /* FIS-based switching support */
 108         HOST_CAP_PMP            = (1 << 17), /* Port Multiplier support */
 109         HOST_CAP_ONLY           = (1 << 18), /* Supports AHCI mode only */
 110         HOST_CAP_CLO            = (1 << 24), /* Command List Override support */
 111         HOST_CAP_LED            = (1 << 25), /* Supports activity LED */
 112         HOST_CAP_ALPM           = (1 << 26), /* Aggressive Link PM support */
 113         HOST_CAP_SSS            = (1 << 27), /* Staggered Spin-up */
 114         HOST_CAP_MPS            = (1 << 28), /* Mechanical presence switch */
 115         HOST_CAP_SNTF           = (1 << 29), /* SNotification register */
 116         HOST_CAP_NCQ            = (1 << 30), /* Native Command Queueing */
 117         HOST_CAP_64             = (1 << 31), /* PCI DAC (64-bit DMA) support */
 118
 119         /* HOST_CAP2 bits */
 120         HOST_CAP2_BOH           = (1 << 0),  /* BIOS/OS handoff supported */
 121         HOST_CAP2_NVMHCI        = (1 << 1),  /* NVMHCI supported */
 122         HOST_CAP2_APST          = (1 << 2),  /* Automatic partial to slumber */
 123         HOST_CAP2_SDS           = (1 << 3),  /* Support device sleep */
 124         HOST_CAP2_SADM          = (1 << 4),  /* Support aggressive DevSlp */
 125         HOST_CAP2_DESO          = (1 << 5),  /* DevSlp from slumber only */
 126
 127         /* registers for each SATA port */
 128         PORT_LST_ADDR           = 0x00, /* command list DMA addr */
 129         PORT_LST_ADDR_HI        = 0x04, /* command list DMA addr hi */
 130         PORT_FIS_ADDR           = 0x08, /* FIS rx buf addr */
 131         PORT_FIS_ADDR_HI        = 0x0c, /* FIS rx buf addr hi */
 132         PORT_IRQ_STAT           = 0x10, /* interrupt status */
 133         PORT_IRQ_MASK           = 0x14, /* interrupt enable/disable mask */
 134         PORT_CMD                = 0x18, /* port command */
 135         PORT_TFDATA             = 0x20, /* taskfile data */
 136         PORT_SIG                = 0x24, /* device TF signature */
 137         PORT_CMD_ISSUE          = 0x38, /* command issue */
 138         PORT_SCR_STAT           = 0x28, /* SATA phy register: SStatus */
 139         PORT_SCR_CTL            = 0x2c, /* SATA phy register: SControl */
 140         PORT_SCR_ERR            = 0x30, /* SATA phy register: SError */
 141         PORT_SCR_ACT            = 0x34, /* SATA phy register: SActive */
 142         PORT_SCR_NTF            = 0x3c, /* SATA phy register: SNotification */
 143         PORT_FBS                = 0x40, /* FIS-based Switching */
 144         PORT_DEVSLP             = 0x44, /* device sleep */
 145
 146         /* PORT_IRQ_{STAT,MASK} bits */
 147         PORT_IRQ_COLD_PRES      = (1 << 31), /* cold presence detect */
 148         PORT_IRQ_TF_ERR         = (1 << 30), /* task file error */
 149         PORT_IRQ_HBUS_ERR       = (1 << 29), /* host bus fatal error */
 150         PORT_IRQ_HBUS_DATA_ERR  = (1 << 28), /* host bus data error */
 151         PORT_IRQ_IF_ERR         = (1 << 27), /* interface fatal error */
 152         PORT_IRQ_IF_NONFATAL    = (1 << 26), /* interface non-fatal error */
 153         PORT_IRQ_OVERFLOW       = (1 << 24), /* xfer exhausted available S/G */
 154         PORT_IRQ_BAD_PMP        = (1 << 23), /* incorrect port multiplier */
 155
 156         PORT_IRQ_PHYRDY         = (1 << 22), /* PhyRdy changed */
 157         PORT_IRQ_DEV_ILCK       = (1 << 7), /* device interlock */
 158         PORT_IRQ_CONNECT        = (1 << 6), /* port connect change status */
 159         PORT_IRQ_SG_DONE        = (1 << 5), /* descriptor processed */
 160         PORT_IRQ_UNK_FIS        = (1 << 4), /* unknown FIS rx'd */
 161         PORT_IRQ_SDB_FIS        = (1 << 3), /* Set Device Bits FIS rx'd */
 162         PORT_IRQ_DMAS_FIS       = (1 << 2), /* DMA Setup FIS rx'd */
 163         PORT_IRQ_PIOS_FIS       = (1 << 1), /* PIO Setup FIS rx'd */
 164         PORT_IRQ_D2H_REG_FIS    = (1 << 0), /* D2H Register FIS rx'd */
 165
 166         PORT_IRQ_FREEZE         = PORT_IRQ_HBUS_ERR |
 167                                   PORT_IRQ_IF_ERR |
 168                                   PORT_IRQ_CONNECT |
 169                                   PORT_IRQ_PHYRDY |
 170                                   PORT_IRQ_UNK_FIS |
 171                                   PORT_IRQ_BAD_PMP,
 172         PORT_IRQ_ERROR          = PORT_IRQ_FREEZE |
 173                                   PORT_IRQ_TF_ERR |
 174                                   PORT_IRQ_HBUS_DATA_ERR,
 175         DEF_PORT_IRQ            = PORT_IRQ_ERROR | PORT_IRQ_SG_DONE |
 176                                   PORT_IRQ_SDB_FIS | PORT_IRQ_DMAS_FIS |
 177                                   PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS,
 178
 179         /* PORT_CMD bits */
 180         PORT_CMD_ASP            = (1 << 27), /* Aggressive Slumber/Partial */
 181         PORT_CMD_ALPE           = (1 << 26), /* Aggressive Link PM enable */
 182         PORT_CMD_ATAPI          = (1 << 24), /* Device is ATAPI */
 183         PORT_CMD_FBSCP          = (1 << 22), /* FBS Capable Port */
 184         PORT_CMD_ESP            = (1 << 21), /* External Sata Port */
 185         PORT_CMD_HPCP           = (1 << 18), /* HotPlug Capable Port */
 186         PORT_CMD_PMP            = (1 << 17), /* PMP attached */
 187         PORT_CMD_LIST_ON        = (1 << 15), /* cmd list DMA engine running */
 188         PORT_CMD_FIS_ON         = (1 << 14), /* FIS DMA engine running */
 189         PORT_CMD_FIS_RX         = (1 << 4), /* Enable FIS receive DMA engine */
 190         PORT_CMD_CLO            = (1 << 3), /* Command list override */
 191         PORT_CMD_POWER_ON       = (1 << 2), /* Power up device */
 192         PORT_CMD_SPIN_UP        = (1 << 1), /* Spin up device */
 193         PORT_CMD_START          = (1 << 0), /* Enable port DMA engine */
 194
 195         PORT_CMD_ICC_MASK       = (0xf << 28), /* i/f ICC state mask */
 196         PORT_CMD_ICC_ACTIVE     = (0x1 << 28), /* Put i/f in active state */
 197         PORT_CMD_ICC_PARTIAL    = (0x2 << 28), /* Put i/f in partial state */
 198         PORT_CMD_ICC_SLUMBER    = (0x6 << 28), /* Put i/f in slumber state */
 199
 200         /* PORT_FBS bits */
 201         PORT_FBS_DWE_OFFSET     = 16, /* FBS device with error offset */
 202         PORT_FBS_ADO_OFFSET     = 12, /* FBS active dev optimization offset */
 203         PORT_FBS_DEV_OFFSET     = 8,  /* FBS device to issue offset */
 204         PORT_FBS_DEV_MASK       = (0xf << PORT_FBS_DEV_OFFSET),  /* FBS.DEV */
 205         PORT_FBS_SDE            = (1 << 2), /* FBS single device error */
 206         PORT_FBS_DEC            = (1 << 1), /* FBS device error clear */
 207         PORT_FBS_EN             = (1 << 0), /* Enable FBS */
 208
 209         /* PORT_DEVSLP bits */
 210         PORT_DEVSLP_DM_OFFSET   = 25,             /* DITO multiplier offset */
 211         PORT_DEVSLP_DM_MASK     = (0xf << 25),    /* DITO multiplier mask */
 212         PORT_DEVSLP_DITO_OFFSET = 15,             /* DITO offset */
 213         PORT_DEVSLP_MDAT_OFFSET = 10,             /* Minimum assertion time */
 214         PORT_DEVSLP_DETO_OFFSET = 2,              /* DevSlp exit timeout */
 215         PORT_DEVSLP_DSP         = (1 << 1),       /* DevSlp present */
 216         PORT_DEVSLP_ADSE        = (1 << 0),       /* Aggressive DevSlp enable */
 217
 218         /* hpriv->flags bits */
 219
 220 #define AHCI_HFLAGS(flags)              .private_data   = (void *)(flags)
 221
 222         AHCI_HFLAG_NO_NCQ               = (1 << 0),
 223         AHCI_HFLAG_IGN_IRQ_IF_ERR       = (1 << 1), /* ignore IRQ_IF_ERR */
 224         AHCI_HFLAG_IGN_SERR_INTERNAL    = (1 << 2), /* ignore SERR_INTERNAL */
 225         AHCI_HFLAG_32BIT_ONLY           = (1 << 3), /* force 32bit */
 226         AHCI_HFLAG_MV_PATA              = (1 << 4), /* PATA port */
 227         AHCI_HFLAG_NO_MSI               = (1 << 5), /* no PCI MSI */
 228         AHCI_HFLAG_NO_PMP               = (1 << 6), /* no PMP */
 229         AHCI_HFLAG_SECT255              = (1 << 8), /* max 255 sectors */
 230         AHCI_HFLAG_YES_NCQ              = (1 << 9), /* force NCQ cap on */
 231         AHCI_HFLAG_NO_SUSPEND           = (1 << 10), /* don't suspend */
 232         AHCI_HFLAG_SRST_TOUT_IS_OFFLINE = (1 << 11), /* treat SRST timeout as
 233                                                         link offline */
 234         AHCI_HFLAG_NO_SNTF              = (1 << 12), /* no sntf */
 235         AHCI_HFLAG_NO_FPDMA_AA          = (1 << 13), /* no FPDMA AA */
 236         AHCI_HFLAG_YES_FBS              = (1 << 14), /* force FBS cap on */
 237         AHCI_HFLAG_DELAY_ENGINE         = (1 << 15), /* do not start engine on
 238                                                         port start (wait until
 239                                                         error-handling stage) */
 240         AHCI_HFLAG_MULTI_MSI            = (1 << 16), /* multiple PCI MSIs */
 241         AHCI_HFLAG_NO_DEVSLP            = (1 << 17), /* no device sleep */
 242         AHCI_HFLAG_NO_FBS               = (1 << 18), /* no FBS */
 243         AHCI_HFLAG_EDGE_IRQ             = (1 << 19), /* HOST_IRQ_STAT behaves as
 244                                                         Edge Triggered */
 245
 246         /* ap->flags bits */
 247
 248         AHCI_FLAG_COMMON                = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA |
 249                                           ATA_FLAG_ACPI_SATA | ATA_FLAG_AN,
 250
 251         ICH_MAP                         = 0x90, /* ICH MAP register */
 252
 253         /* em constants */
 254         EM_MAX_SLOTS                    = 8,
 255         EM_MAX_RETRY                    = 5,
 256
 257         /* em_ctl bits */
 258         EM_CTL_RST              = (1 << 9), /* Reset */
 259         EM_CTL_TM               = (1 << 8), /* Transmit Message */
 260         EM_CTL_MR               = (1 << 0), /* Message Received */
 261         EM_CTL_ALHD             = (1 << 26), /* Activity LED */
 262         EM_CTL_XMT              = (1 << 25), /* Transmit Only */
 263         EM_CTL_SMB              = (1 << 24), /* Single Message Buffer */
 264         EM_CTL_SGPIO            = (1 << 19), /* SGPIO messages supported */
 265         EM_CTL_SES              = (1 << 18), /* SES-2 messages supported */
 266         EM_CTL_SAFTE            = (1 << 17), /* SAF-TE messages supported */
 267         EM_CTL_LED              = (1 << 16), /* LED messages supported */
 268
 269         /* em message type */
 270         EM_MSG_TYPE_LED         = (1 << 0), /* LED */
 271         EM_MSG_TYPE_SAFTE       = (1 << 1), /* SAF-TE */
 272         EM_MSG_TYPE_SES2        = (1 << 2), /* SES-2 */
 273         EM_MSG_TYPE_SGPIO       = (1 << 3), /* SGPIO */
 274 };
 275
 276 struct ahci_cmd_hdr {
 277         __le32                  opts;
 278         __le32                  status;
 279         __le32                  tbl_addr;
 280         __le32                  tbl_addr_hi;
 281         __le32                  reserved[4];
 282 };
 283
 284 struct ahci_sg {
 285         __le32                  addr;
 286         __le32                  addr_hi;
 287         __le32                  reserved;
 288         __le32                  flags_size;
 289 };
 290
 291 struct ahci_em_priv {
 292         enum sw_activity blink_policy;
 293         struct timer_list timer;
 294         unsigned long saved_activity;
 295         unsigned long activity;
 296         unsigned long led_state;
 297 };
 298
 299 struct ahci_port_priv {
 300         struct ata_link         *active_link;
 301         struct ahci_cmd_hdr     *cmd_slot;
 302         dma_addr_t              cmd_slot_dma;
 303         void                    *cmd_tbl;
 304         dma_addr_t              cmd_tbl_dma;
 305         void                    *rx_fis;
 306         dma_addr_t              rx_fis_dma;
 307         /* for NCQ spurious interrupt analysis */
 308         unsigned int            ncq_saw_d2h:1;
 309         unsigned int            ncq_saw_dmas:1;
 310         unsigned int            ncq_saw_sdb:1;
 311         atomic_t                intr_status;    /* interrupts to handle */
 312         spinlock_t              lock;           /* protects parent ata_port */
 313         u32                     intr_mask;      /* interrupts to enable */
 314         bool                    fbs_supported;  /* set iff FBS is supported */
 315         bool                    fbs_enabled;    /* set iff FBS is enabled */
 316         int                     fbs_last_dev;   /* save FBS.DEV of last FIS */
 317         /* enclosure management info per PM slot */
 318         struct ahci_em_priv     em_priv[EM_MAX_SLOTS];
 319         char                    *irq_desc;      /* desc in /proc/interrupts */
 320 };
 321
 322 struct ahci_host_priv {
 323         /* Input fields */
 324         unsigned int            flags;          /* AHCI_HFLAG_* */
 325         u32                     force_port_map; /* force port map */
 326         u32                     mask_port_map;  /* mask out particular bits */
 327
 328         void __iomem *          mmio;           /* bus-independent mem map */
 329         u32                     cap;            /* cap to use */
 330         u32                     cap2;           /* cap2 to use */
 331         u32                     port_map;       /* port map to use */
 332         u32                     saved_cap;      /* saved initial cap */
 333         u32                     saved_cap2;     /* saved initial cap2 */
 334         u32                     saved_port_map; /* saved initial port_map */
 335         u32                     em_loc; /* enclosure management location */
 336         u32                     em_buf_sz;      /* EM buffer size in byte */
 337         u32                     em_msg_type;    /* EM message type */
 338         bool                    got_runtime_pm; /* Did we do pm_runtime_get? */
 339         struct clk              *clks[AHCI_MAX_CLKS]; /* Optional */
 340         struct regulator        **target_pwrs;  /* Optional */
 341         /*
 342          * If platform uses PHYs. There is a 1:1 relation between the port number and
 343          * the PHY position in this array.
 344          */
 345         struct phy              **phys;
 346         unsigned                nports;         /* Number of ports */
 347         void                    *plat_data;     /* Other platform data */
 348         unsigned int            irq;            /* interrupt line */
 349         /*
 350          * Optional ahci_start_engine override, if not set this gets set to the
 351          * default ahci_start_engine during ahci_save_initial_config, this can
 352          * be overridden anytime before the host is activated.
 353          */
 354         void                    (*start_engine)(struct ata_port *ap);
 355 };
 356
 357 extern int ahci_ignore_sss;
 358
 359 extern struct device_attribute *ahci_shost_attrs[];
 360 extern struct device_attribute *ahci_sdev_attrs[];
 361
 362 /*
 363  * This must be instantiated by the edge drivers.  Read the comments
 364  * for ATA_BASE_SHT
 365  */
 366 #define AHCI_SHT(drv_name)                                              \
 367         ATA_NCQ_SHT(drv_name),                                          \
 368         .can_queue              = AHCI_MAX_CMDS - 1,                    \
 369         .sg_tablesize           = AHCI_MAX_SG,                          \
 370         .dma_boundary           = AHCI_DMA_BOUNDARY,                    \
 371         .shost_attrs            = ahci_shost_attrs,                     \
 372         .sdev_attrs             = ahci_sdev_attrs
 373
 374 extern struct ata_port_operations ahci_ops;
 375 extern struct ata_port_operations ahci_platform_ops;
 376 extern struct ata_port_operations ahci_pmp_retry_srst_ops;
 377
 378 unsigned int ahci_dev_classify(struct ata_port *ap);
 379 void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
 380                         u32 opts);
 381 void ahci_save_initial_config(struct device *dev,
 382                               struct ahci_host_priv *hpriv);
 383 void ahci_init_controller(struct ata_host *host);
 384 int ahci_reset_controller(struct ata_host *host);
 385
 386 int ahci_do_softreset(struct ata_link *link, unsigned int *class,
 387                       int pmp, unsigned long deadline,
 388                       int (*check_ready)(struct ata_link *link));
 389
 390 unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
 391 int ahci_stop_engine(struct ata_port *ap);
 392 void ahci_start_fis_rx(struct ata_port *ap);
 393 void ahci_start_engine(struct ata_port *ap);
 394 int ahci_check_ready(struct ata_link *link);
 395 int ahci_kick_engine(struct ata_port *ap);
 396 int ahci_port_resume(struct ata_port *ap);
 397 void ahci_set_em_messages(struct ahci_host_priv *hpriv,
 398                           struct ata_port_info *pi);
 399 int ahci_reset_em(struct ata_host *host);
 400 void ahci_print_info(struct ata_host *host, const char *scc_s);
 401 int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht);
 402 void ahci_error_handler(struct ata_port *ap);
 403
 404 static inline void __iomem *__ahci_port_base(struct ata_host *host,
 405                                              unsigned int port_no)
 406 {
 407         struct ahci_host_priv *hpriv = host->private_data;
 408         void __iomem *mmio = hpriv->mmio;
 409
 410         return mmio + 0x100 + (port_no * 0x80);
 411 }
 412
 413 static inline void __iomem *ahci_port_base(struct ata_port *ap)
 414 {
 415         return __ahci_port_base(ap->host, ap->port_no);
 416 }
 417
 418 static inline int ahci_nr_ports(u32 cap)
 419 {
 420         return (cap & 0x1f) + 1;
 421 }
 422
 423 #endif /* _AHCI_H */