1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * ahci.h - Common AHCI SATA definitions and declarations 4 * 5 * Maintained by: Tejun Heo <tj@kernel.org> 6 * Please ALWAYS copy linux-ide@vger.kernel.org 7 * on emails. 8 * 9 * Copyright 2004-2005 Red Hat, Inc. 10 * 11 * libata documentation is available via 'make {ps|pdf}docs', 12 * as Documentation/driver-api/libata.rst 13 * 14 * AHCI hardware documentation: 15 * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf 16 * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf 17 */ 18 19 #ifndef _AHCI_H 20 #define _AHCI_H 21 22 #include <linux/pci.h> 23 #include <linux/clk.h> 24 #include <linux/libata.h> 25 #include <linux/phy/phy.h> 26 #include <linux/regulator/consumer.h> 27 28 /* Enclosure Management Control */ 29 #define EM_CTRL_MSG_TYPE 0x000f0000 30 31 /* Enclosure Management LED Message Type */ 32 #define EM_MSG_LED_HBA_PORT 0x0000000f 33 #define EM_MSG_LED_PMP_SLOT 0x0000ff00 34 #define EM_MSG_LED_VALUE 0xffff0000 35 #define EM_MSG_LED_VALUE_ACTIVITY 0x00070000 36 #define EM_MSG_LED_VALUE_OFF 0xfff80000 37 #define EM_MSG_LED_VALUE_ON 0x00010000 38 39 enum { 40 AHCI_MAX_PORTS = 32, 41 AHCI_MAX_CLKS = 5, 42 AHCI_MAX_SG = 168, /* hardware max is 64K */ 43 AHCI_DMA_BOUNDARY = 0xffffffff, 44 AHCI_MAX_CMDS = 32, 45 AHCI_CMD_SZ = 32, 46 AHCI_CMD_SLOT_SZ = AHCI_MAX_CMDS * AHCI_CMD_SZ, 47 AHCI_RX_FIS_SZ = 256, 48 AHCI_CMD_TBL_CDB = 0x40, 49 AHCI_CMD_TBL_HDR_SZ = 0x80, 50 AHCI_CMD_TBL_SZ = AHCI_CMD_TBL_HDR_SZ + (AHCI_MAX_SG * 16), 51 AHCI_CMD_TBL_AR_SZ = AHCI_CMD_TBL_SZ * AHCI_MAX_CMDS, 52 AHCI_PORT_PRIV_DMA_SZ = AHCI_CMD_SLOT_SZ + AHCI_CMD_TBL_AR_SZ + 53 AHCI_RX_FIS_SZ, 54 AHCI_PORT_PRIV_FBS_DMA_SZ = AHCI_CMD_SLOT_SZ + 55 AHCI_CMD_TBL_AR_SZ + 56 (AHCI_RX_FIS_SZ * 16), 57 AHCI_IRQ_ON_SG = (1 << 31), 58 AHCI_CMD_ATAPI = (1 << 5), 59 AHCI_CMD_WRITE = (1 << 6), 60 AHCI_CMD_PREFETCH = (1 << 7), 61 AHCI_CMD_RESET = (1 << 8), 62 AHCI_CMD_CLR_BUSY = (1 << 10), 63 64 RX_FIS_PIO_SETUP = 0x20, /* offset of PIO Setup FIS data */ 65 RX_FIS_D2H_REG = 0x40, /* offset of D2H Register FIS data */ 66 RX_FIS_SDB = 0x58, /* offset of SDB FIS data */ 67 RX_FIS_UNK = 0x60, /* offset of Unknown FIS data */ 68 69 /* global controller registers */ 70 HOST_CAP = 0x00, /* host capabilities */ 71 HOST_CTL = 0x04, /* global host control */ 72 HOST_IRQ_STAT = 0x08, /* interrupt status */ 73 HOST_PORTS_IMPL = 0x0c, /* bitmap of implemented ports */ 74 HOST_VERSION = 0x10, /* AHCI spec. version compliancy */ 75 HOST_EM_LOC = 0x1c, /* Enclosure Management location */ 76 HOST_EM_CTL = 0x20, /* Enclosure Management Control */ 77 HOST_CAP2 = 0x24, /* host capabilities, extended */ 78 79 /* HOST_CTL bits */ 80 HOST_RESET = (1 << 0), /* reset controller; self-clear */ 81 HOST_IRQ_EN = (1 << 1), /* global IRQ enable */ 82 HOST_MRSM = (1 << 2), /* MSI Revert to Single Message */ 83 HOST_AHCI_EN = (1 << 31), /* AHCI enabled */ 84 85 /* HOST_CAP bits */ 86 HOST_CAP_SXS = (1 << 5), /* Supports External SATA */ 87 HOST_CAP_EMS = (1 << 6), /* Enclosure Management support */ 88 HOST_CAP_CCC = (1 << 7), /* Command Completion Coalescing */ 89 HOST_CAP_PART = (1 << 13), /* Partial state capable */ 90 HOST_CAP_SSC = (1 << 14), /* Slumber state capable */ 91 HOST_CAP_PIO_MULTI = (1 << 15), /* PIO multiple DRQ support */ 92 HOST_CAP_FBS = (1 << 16), /* FIS-based switching support */ 93 HOST_CAP_PMP = (1 << 17), /* Port Multiplier support */ 94 HOST_CAP_ONLY = (1 << 18), /* Supports AHCI mode only */ 95 HOST_CAP_CLO = (1 << 24), /* Command List Override support */ 96 HOST_CAP_LED = (1 << 25), /* Supports activity LED */ 97 HOST_CAP_ALPM = (1 << 26), /* Aggressive Link PM support */ 98 HOST_CAP_SSS = (1 << 27), /* Staggered Spin-up */ 99 HOST_CAP_MPS = (1 << 28), /* Mechanical presence switch */ 100 HOST_CAP_SNTF = (1 << 29), /* SNotification register */ 101 HOST_CAP_NCQ = (1 << 30), /* Native Command Queueing */ 102 HOST_CAP_64 = (1 << 31), /* PCI DAC (64-bit DMA) support */ 103 104 /* HOST_CAP2 bits */ 105 HOST_CAP2_BOH = (1 << 0), /* BIOS/OS handoff supported */ 106 HOST_CAP2_NVMHCI = (1 << 1), /* NVMHCI supported */ 107 HOST_CAP2_APST = (1 << 2), /* Automatic partial to slumber */ 108 HOST_CAP2_SDS = (1 << 3), /* Support device sleep */ 109 HOST_CAP2_SADM = (1 << 4), /* Support aggressive DevSlp */ 110 HOST_CAP2_DESO = (1 << 5), /* DevSlp from slumber only */ 111 112 /* registers for each SATA port */ 113 PORT_LST_ADDR = 0x00, /* command list DMA addr */ 114 PORT_LST_ADDR_HI = 0x04, /* command list DMA addr hi */ 115 PORT_FIS_ADDR = 0x08, /* FIS rx buf addr */ 116 PORT_FIS_ADDR_HI = 0x0c, /* FIS rx buf addr hi */ 117 PORT_IRQ_STAT = 0x10, /* interrupt status */ 118 PORT_IRQ_MASK = 0x14, /* interrupt enable/disable mask */ 119 PORT_CMD = 0x18, /* port command */ 120 PORT_TFDATA = 0x20, /* taskfile data */ 121 PORT_SIG = 0x24, /* device TF signature */ 122 PORT_CMD_ISSUE = 0x38, /* command issue */ 123 PORT_SCR_STAT = 0x28, /* SATA phy register: SStatus */ 124 PORT_SCR_CTL = 0x2c, /* SATA phy register: SControl */ 125 PORT_SCR_ERR = 0x30, /* SATA phy register: SError */ 126 PORT_SCR_ACT = 0x34, /* SATA phy register: SActive */ 127 PORT_SCR_NTF = 0x3c, /* SATA phy register: SNotification */ 128 PORT_FBS = 0x40, /* FIS-based Switching */ 129 PORT_DEVSLP = 0x44, /* device sleep */ 130 131 /* PORT_IRQ_{STAT,MASK} bits */ 132 PORT_IRQ_COLD_PRES = (1 << 31), /* cold presence detect */ 133 PORT_IRQ_TF_ERR = (1 << 30), /* task file error */ 134 PORT_IRQ_HBUS_ERR = (1 << 29), /* host bus fatal error */ 135 PORT_IRQ_HBUS_DATA_ERR = (1 << 28), /* host bus data error */ 136 PORT_IRQ_IF_ERR = (1 << 27), /* interface fatal error */ 137 PORT_IRQ_IF_NONFATAL = (1 << 26), /* interface non-fatal error */ 138 PORT_IRQ_OVERFLOW = (1 << 24), /* xfer exhausted available S/G */ 139 PORT_IRQ_BAD_PMP = (1 << 23), /* incorrect port multiplier */ 140 141 PORT_IRQ_PHYRDY = (1 << 22), /* PhyRdy changed */ 142 PORT_IRQ_DEV_ILCK = (1 << 7), /* device interlock */ 143 PORT_IRQ_CONNECT = (1 << 6), /* port connect change status */ 144 PORT_IRQ_SG_DONE = (1 << 5), /* descriptor processed */ 145 PORT_IRQ_UNK_FIS = (1 << 4), /* unknown FIS rx'd */ 146 PORT_IRQ_SDB_FIS = (1 << 3), /* Set Device Bits FIS rx'd */ 147 PORT_IRQ_DMAS_FIS = (1 << 2), /* DMA Setup FIS rx'd */ 148 PORT_IRQ_PIOS_FIS = (1 << 1), /* PIO Setup FIS rx'd */ 149 PORT_IRQ_D2H_REG_FIS = (1 << 0), /* D2H Register FIS rx'd */ 150 151 PORT_IRQ_FREEZE = PORT_IRQ_HBUS_ERR | 152 PORT_IRQ_IF_ERR | 153 PORT_IRQ_CONNECT | 154 PORT_IRQ_PHYRDY | 155 PORT_IRQ_UNK_FIS | 156 PORT_IRQ_BAD_PMP, 157 PORT_IRQ_ERROR = PORT_IRQ_FREEZE | 158 PORT_IRQ_TF_ERR | 159 PORT_IRQ_HBUS_DATA_ERR, 160 DEF_PORT_IRQ = PORT_IRQ_ERROR | PORT_IRQ_SG_DONE | 161 PORT_IRQ_SDB_FIS | PORT_IRQ_DMAS_FIS | 162 PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS, 163 164 /* PORT_CMD bits */ 165 PORT_CMD_ASP = (1 << 27), /* Aggressive Slumber/Partial */ 166 PORT_CMD_ALPE = (1 << 26), /* Aggressive Link PM enable */ 167 PORT_CMD_ATAPI = (1 << 24), /* Device is ATAPI */ 168 PORT_CMD_FBSCP = (1 << 22), /* FBS Capable Port */ 169 PORT_CMD_ESP = (1 << 21), /* External Sata Port */ 170 PORT_CMD_HPCP = (1 << 18), /* HotPlug Capable Port */ 171 PORT_CMD_PMP = (1 << 17), /* PMP attached */ 172 PORT_CMD_LIST_ON = (1 << 15), /* cmd list DMA engine running */ 173 PORT_CMD_FIS_ON = (1 << 14), /* FIS DMA engine running */ 174 PORT_CMD_FIS_RX = (1 << 4), /* Enable FIS receive DMA engine */ 175 PORT_CMD_CLO = (1 << 3), /* Command list override */ 176 PORT_CMD_POWER_ON = (1 << 2), /* Power up device */ 177 PORT_CMD_SPIN_UP = (1 << 1), /* Spin up device */ 178 PORT_CMD_START = (1 << 0), /* Enable port DMA engine */ 179 180 PORT_CMD_ICC_MASK = (0xf << 28), /* i/f ICC state mask */ 181 PORT_CMD_ICC_ACTIVE = (0x1 << 28), /* Put i/f in active state */ 182 PORT_CMD_ICC_PARTIAL = (0x2 << 28), /* Put i/f in partial state */ 183 PORT_CMD_ICC_SLUMBER = (0x6 << 28), /* Put i/f in slumber state */ 184 185 /* PORT_FBS bits */ 186 PORT_FBS_DWE_OFFSET = 16, /* FBS device with error offset */ 187 PORT_FBS_ADO_OFFSET = 12, /* FBS active dev optimization offset */ 188 PORT_FBS_DEV_OFFSET = 8, /* FBS device to issue offset */ 189 PORT_FBS_DEV_MASK = (0xf << PORT_FBS_DEV_OFFSET), /* FBS.DEV */ 190 PORT_FBS_SDE = (1 << 2), /* FBS single device error */ 191 PORT_FBS_DEC = (1 << 1), /* FBS device error clear */ 192 PORT_FBS_EN = (1 << 0), /* Enable FBS */ 193 194 /* PORT_DEVSLP bits */ 195 PORT_DEVSLP_DM_OFFSET = 25, /* DITO multiplier offset */ 196 PORT_DEVSLP_DM_MASK = (0xf << 25), /* DITO multiplier mask */ 197 PORT_DEVSLP_DITO_OFFSET = 15, /* DITO offset */ 198 PORT_DEVSLP_MDAT_OFFSET = 10, /* Minimum assertion time */ 199 PORT_DEVSLP_DETO_OFFSET = 2, /* DevSlp exit timeout */ 200 PORT_DEVSLP_DSP = (1 << 1), /* DevSlp present */ 201 PORT_DEVSLP_ADSE = (1 << 0), /* Aggressive DevSlp enable */ 202 203 /* hpriv->flags bits */ 204 205 #define AHCI_HFLAGS(flags) .private_data = (void *)(flags) 206 207 AHCI_HFLAG_NO_NCQ = (1 << 0), 208 AHCI_HFLAG_IGN_IRQ_IF_ERR = (1 << 1), /* ignore IRQ_IF_ERR */ 209 AHCI_HFLAG_IGN_SERR_INTERNAL = (1 << 2), /* ignore SERR_INTERNAL */ 210 AHCI_HFLAG_32BIT_ONLY = (1 << 3), /* force 32bit */ 211 AHCI_HFLAG_MV_PATA = (1 << 4), /* PATA port */ 212 AHCI_HFLAG_NO_MSI = (1 << 5), /* no PCI MSI */ 213 AHCI_HFLAG_NO_PMP = (1 << 6), /* no PMP */ 214 AHCI_HFLAG_SECT255 = (1 << 8), /* max 255 sectors */ 215 AHCI_HFLAG_YES_NCQ = (1 << 9), /* force NCQ cap on */ 216 AHCI_HFLAG_NO_SUSPEND = (1 << 10), /* don't suspend */ 217 AHCI_HFLAG_SRST_TOUT_IS_OFFLINE = (1 << 11), /* treat SRST timeout as 218 link offline */ 219 AHCI_HFLAG_NO_SNTF = (1 << 12), /* no sntf */ 220 AHCI_HFLAG_NO_FPDMA_AA = (1 << 13), /* no FPDMA AA */ 221 AHCI_HFLAG_YES_FBS = (1 << 14), /* force FBS cap on */ 222 AHCI_HFLAG_DELAY_ENGINE = (1 << 15), /* do not start engine on 223 port start (wait until 224 error-handling stage) */ 225 AHCI_HFLAG_NO_DEVSLP = (1 << 17), /* no device sleep */ 226 AHCI_HFLAG_NO_FBS = (1 << 18), /* no FBS */ 227 228 #ifdef CONFIG_PCI_MSI 229 AHCI_HFLAG_MULTI_MSI = (1 << 20), /* per-port MSI(-X) */ 230 #else 231 /* compile out MSI infrastructure */ 232 AHCI_HFLAG_MULTI_MSI = 0, 233 #endif 234 AHCI_HFLAG_WAKE_BEFORE_STOP = (1 << 22), /* wake before DMA stop */ 235 AHCI_HFLAG_YES_ALPM = (1 << 23), /* force ALPM cap on */ 236 AHCI_HFLAG_NO_WRITE_TO_RO = (1 << 24), /* don't write to read 237 only registers */ 238 AHCI_HFLAG_IS_MOBILE = (1 << 25), /* mobile chipset, use 239 SATA_MOBILE_LPM_POLICY 240 as default lpm_policy */ 241 AHCI_HFLAG_SUSPEND_PHYS = (1 << 26), /* handle PHYs during 242 suspend/resume */ 243 244 /* ap->flags bits */ 245 246 AHCI_FLAG_COMMON = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | 247 ATA_FLAG_ACPI_SATA | ATA_FLAG_AN, 248 249 ICH_MAP = 0x90, /* ICH MAP register */ 250 251 /* em constants */ 252 EM_MAX_SLOTS = 8, 253 EM_MAX_RETRY = 5, 254 255 /* em_ctl bits */ 256 EM_CTL_RST = (1 << 9), /* Reset */ 257 EM_CTL_TM = (1 << 8), /* Transmit Message */ 258 EM_CTL_MR = (1 << 0), /* Message Received */ 259 EM_CTL_ALHD = (1 << 26), /* Activity LED */ 260 EM_CTL_XMT = (1 << 25), /* Transmit Only */ 261 EM_CTL_SMB = (1 << 24), /* Single Message Buffer */ 262 EM_CTL_SGPIO = (1 << 19), /* SGPIO messages supported */ 263 EM_CTL_SES = (1 << 18), /* SES-2 messages supported */ 264 EM_CTL_SAFTE = (1 << 17), /* SAF-TE messages supported */ 265 EM_CTL_LED = (1 << 16), /* LED messages supported */ 266 267 /* em message type */ 268 EM_MSG_TYPE_LED = (1 << 0), /* LED */ 269 EM_MSG_TYPE_SAFTE = (1 << 1), /* SAF-TE */ 270 EM_MSG_TYPE_SES2 = (1 << 2), /* SES-2 */ 271 EM_MSG_TYPE_SGPIO = (1 << 3), /* SGPIO */ 272 }; 273 274 struct ahci_cmd_hdr { 275 __le32 opts; 276 __le32 status; 277 __le32 tbl_addr; 278 __le32 tbl_addr_hi; 279 __le32 reserved[4]; 280 }; 281 282 struct ahci_sg { 283 __le32 addr; 284 __le32 addr_hi; 285 __le32 reserved; 286 __le32 flags_size; 287 }; 288 289 struct ahci_em_priv { 290 enum sw_activity blink_policy; 291 struct timer_list timer; 292 unsigned long saved_activity; 293 unsigned long activity; 294 unsigned long led_state; 295 struct ata_link *link; 296 }; 297 298 struct ahci_port_priv { 299 struct ata_link *active_link; 300 struct ahci_cmd_hdr *cmd_slot; 301 dma_addr_t cmd_slot_dma; 302 void *cmd_tbl; 303 dma_addr_t cmd_tbl_dma; 304 void *rx_fis; 305 dma_addr_t rx_fis_dma; 306 /* for NCQ spurious interrupt analysis */ 307 unsigned int ncq_saw_d2h:1; 308 unsigned int ncq_saw_dmas:1; 309 unsigned int ncq_saw_sdb:1; 310 spinlock_t lock; /* protects parent ata_port */ 311 u32 intr_mask; /* interrupts to enable */ 312 bool fbs_supported; /* set iff FBS is supported */ 313 bool fbs_enabled; /* set iff FBS is enabled */ 314 int fbs_last_dev; /* save FBS.DEV of last FIS */ 315 /* enclosure management info per PM slot */ 316 struct ahci_em_priv em_priv[EM_MAX_SLOTS]; 317 char *irq_desc; /* desc in /proc/interrupts */ 318 }; 319 320 struct ahci_host_priv { 321 /* Input fields */ 322 unsigned int flags; /* AHCI_HFLAG_* */ 323 u32 force_port_map; /* force port map */ 324 u32 mask_port_map; /* mask out particular bits */ 325 326 void __iomem * mmio; /* bus-independent mem map */ 327 u32 cap; /* cap to use */ 328 u32 cap2; /* cap2 to use */ 329 u32 version; /* cached version */ 330 u32 port_map; /* port map to use */ 331 u32 saved_cap; /* saved initial cap */ 332 u32 saved_cap2; /* saved initial cap2 */ 333 u32 saved_port_map; /* saved initial port_map */ 334 u32 em_loc; /* enclosure management location */ 335 u32 em_buf_sz; /* EM buffer size in byte */ 336 u32 em_msg_type; /* EM message type */ 337 bool got_runtime_pm; /* Did we do pm_runtime_get? */ 338 struct clk *clks[AHCI_MAX_CLKS]; /* Optional */ 339 struct reset_control *rsts; /* Optional */ 340 struct regulator **target_pwrs; /* Optional */ 341 struct regulator *ahci_regulator;/* Optional */ 342 struct regulator *phy_regulator;/* Optional */ 343 /* 344 * If platform uses PHYs. There is a 1:1 relation between the port number and 345 * the PHY position in this array. 346 */ 347 struct phy **phys; 348 unsigned nports; /* Number of ports */ 349 void *plat_data; /* Other platform data */ 350 unsigned int irq; /* interrupt line */ 351 /* 352 * Optional ahci_start_engine override, if not set this gets set to the 353 * default ahci_start_engine during ahci_save_initial_config, this can 354 * be overridden anytime before the host is activated. 355 */ 356 void (*start_engine)(struct ata_port *ap); 357 /* 358 * Optional ahci_stop_engine override, if not set this gets set to the 359 * default ahci_stop_engine during ahci_save_initial_config, this can 360 * be overridden anytime before the host is activated. 361 */ 362 int (*stop_engine)(struct ata_port *ap); 363 364 irqreturn_t (*irq_handler)(int irq, void *dev_instance); 365 366 /* only required for per-port MSI(-X) support */ 367 int (*get_irq_vector)(struct ata_host *host, 368 int port); 369 }; 370 371 extern int ahci_ignore_sss; 372 373 extern struct device_attribute *ahci_shost_attrs[]; 374 extern struct device_attribute *ahci_sdev_attrs[]; 375 376 /* 377 * This must be instantiated by the edge drivers. Read the comments 378 * for ATA_BASE_SHT 379 */ 380 #define AHCI_SHT(drv_name) \ 381 ATA_NCQ_SHT(drv_name), \ 382 .can_queue = AHCI_MAX_CMDS, \ 383 .sg_tablesize = AHCI_MAX_SG, \ 384 .dma_boundary = AHCI_DMA_BOUNDARY, \ 385 .shost_attrs = ahci_shost_attrs, \ 386 .sdev_attrs = ahci_sdev_attrs 387 388 extern struct ata_port_operations ahci_ops; 389 extern struct ata_port_operations ahci_platform_ops; 390 extern struct ata_port_operations ahci_pmp_retry_srst_ops; 391 392 unsigned int ahci_dev_classify(struct ata_port *ap); 393 void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag, 394 u32 opts); 395 void ahci_save_initial_config(struct device *dev, 396 struct ahci_host_priv *hpriv); 397 void ahci_init_controller(struct ata_host *host); 398 int ahci_reset_controller(struct ata_host *host); 399 400 int ahci_do_softreset(struct ata_link *link, unsigned int *class, 401 int pmp, unsigned long deadline, 402 int (*check_ready)(struct ata_link *link)); 403 404 int ahci_do_hardreset(struct ata_link *link, unsigned int *class, 405 unsigned long deadline, bool *online); 406 407 unsigned int ahci_qc_issue(struct ata_queued_cmd *qc); 408 int ahci_stop_engine(struct ata_port *ap); 409 void ahci_start_fis_rx(struct ata_port *ap); 410 void ahci_start_engine(struct ata_port *ap); 411 int ahci_check_ready(struct ata_link *link); 412 int ahci_kick_engine(struct ata_port *ap); 413 int ahci_port_resume(struct ata_port *ap); 414 void ahci_set_em_messages(struct ahci_host_priv *hpriv, 415 struct ata_port_info *pi); 416 int ahci_reset_em(struct ata_host *host); 417 void ahci_print_info(struct ata_host *host, const char *scc_s); 418 int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht); 419 void ahci_error_handler(struct ata_port *ap); 420 u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked); 421 422 static inline void __iomem *__ahci_port_base(struct ata_host *host, 423 unsigned int port_no) 424 { 425 struct ahci_host_priv *hpriv = host->private_data; 426 void __iomem *mmio = hpriv->mmio; 427 428 return mmio + 0x100 + (port_no * 0x80); 429 } 430 431 static inline void __iomem *ahci_port_base(struct ata_port *ap) 432 { 433 return __ahci_port_base(ap->host, ap->port_no); 434 } 435 436 static inline int ahci_nr_ports(u32 cap) 437 { 438 return (cap & 0x1f) + 1; 439 } 440 441 #endif /* _AHCI_H */ 442