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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#include <linux/bits.h>
28
29/* Enclosure Management Control */
30#define EM_CTRL_MSG_TYPE 0x000f0000
31
32/* Enclosure Management LED Message Type */
33#define EM_MSG_LED_HBA_PORT 0x0000000f
34#define EM_MSG_LED_PMP_SLOT 0x0000ff00
35#define EM_MSG_LED_VALUE 0xffff0000
36#define EM_MSG_LED_VALUE_ACTIVITY 0x00070000
37#define EM_MSG_LED_VALUE_OFF 0xfff80000
38#define EM_MSG_LED_VALUE_ON 0x00010000
39
40enum {
41 AHCI_MAX_PORTS = 32,
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 = BIT(31),
58 AHCI_CMD_ATAPI = BIT(5),
59 AHCI_CMD_WRITE = BIT(6),
60 AHCI_CMD_PREFETCH = BIT(7),
61 AHCI_CMD_RESET = BIT(8),
62 AHCI_CMD_CLR_BUSY = BIT(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 = BIT(0), /* reset controller; self-clear */
81 HOST_IRQ_EN = BIT(1), /* global IRQ enable */
82 HOST_MRSM = BIT(2), /* MSI Revert to Single Message */
83 HOST_AHCI_EN = BIT(31), /* AHCI enabled */
84
85 /* HOST_CAP bits */
86 HOST_CAP_SXS = BIT(5), /* Supports External SATA */
87 HOST_CAP_EMS = BIT(6), /* Enclosure Management support */
88 HOST_CAP_CCC = BIT(7), /* Command Completion Coalescing */
89 HOST_CAP_PART = BIT(13), /* Partial state capable */
90 HOST_CAP_SSC = BIT(14), /* Slumber state capable */
91 HOST_CAP_PIO_MULTI = BIT(15), /* PIO multiple DRQ support */
92 HOST_CAP_FBS = BIT(16), /* FIS-based switching support */
93 HOST_CAP_PMP = BIT(17), /* Port Multiplier support */
94 HOST_CAP_ONLY = BIT(18), /* Supports AHCI mode only */
95 HOST_CAP_CLO = BIT(24), /* Command List Override support */
96 HOST_CAP_LED = BIT(25), /* Supports activity LED */
97 HOST_CAP_ALPM = BIT(26), /* Aggressive Link PM support */
98 HOST_CAP_SSS = BIT(27), /* Staggered Spin-up */
99 HOST_CAP_MPS = BIT(28), /* Mechanical presence switch */
100 HOST_CAP_SNTF = BIT(29), /* SNotification register */
101 HOST_CAP_NCQ = BIT(30), /* Native Command Queueing */
102 HOST_CAP_64 = BIT(31), /* PCI DAC (64-bit DMA) support */
103
104 /* HOST_CAP2 bits */
105 HOST_CAP2_BOH = BIT(0), /* BIOS/OS handoff supported */
106 HOST_CAP2_NVMHCI = BIT(1), /* NVMHCI supported */
107 HOST_CAP2_APST = BIT(2), /* Automatic partial to slumber */
108 HOST_CAP2_SDS = BIT(3), /* Support device sleep */
109 HOST_CAP2_SADM = BIT(4), /* Support aggressive DevSlp */
110 HOST_CAP2_DESO = BIT(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 = BIT(31), /* cold presence detect */
133 PORT_IRQ_TF_ERR = BIT(30), /* task file error */
134 PORT_IRQ_HBUS_ERR = BIT(29), /* host bus fatal error */
135 PORT_IRQ_HBUS_DATA_ERR = BIT(28), /* host bus data error */
136 PORT_IRQ_IF_ERR = BIT(27), /* interface fatal error */
137 PORT_IRQ_IF_NONFATAL = BIT(26), /* interface non-fatal error */
138 PORT_IRQ_OVERFLOW = BIT(24), /* xfer exhausted available S/G */
139 PORT_IRQ_BAD_PMP = BIT(23), /* incorrect port multiplier */
140
141 PORT_IRQ_PHYRDY = BIT(22), /* PhyRdy changed */
142 PORT_IRQ_DMPS = BIT(7), /* mechanical presence status */
143 PORT_IRQ_CONNECT = BIT(6), /* port connect change status */
144 PORT_IRQ_SG_DONE = BIT(5), /* descriptor processed */
145 PORT_IRQ_UNK_FIS = BIT(4), /* unknown FIS rx'd */
146 PORT_IRQ_SDB_FIS = BIT(3), /* Set Device Bits FIS rx'd */
147 PORT_IRQ_DMAS_FIS = BIT(2), /* DMA Setup FIS rx'd */
148 PORT_IRQ_PIOS_FIS = BIT(1), /* PIO Setup FIS rx'd */
149 PORT_IRQ_D2H_REG_FIS = BIT(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 = BIT(27), /* Aggressive Slumber/Partial */
166 PORT_CMD_ALPE = BIT(26), /* Aggressive Link PM enable */
167 PORT_CMD_ATAPI = BIT(24), /* Device is ATAPI */
168 PORT_CMD_FBSCP = BIT(22), /* FBS Capable Port */
169 PORT_CMD_ESP = BIT(21), /* External Sata Port */
170 PORT_CMD_CPD = BIT(20), /* Cold Presence Detection */
171 PORT_CMD_MPSP = BIT(19), /* Mechanical Presence Switch */
172 PORT_CMD_HPCP = BIT(18), /* HotPlug Capable Port */
173 PORT_CMD_PMP = BIT(17), /* PMP attached */
174 PORT_CMD_LIST_ON = BIT(15), /* cmd list DMA engine running */
175 PORT_CMD_FIS_ON = BIT(14), /* FIS DMA engine running */
176 PORT_CMD_FIS_RX = BIT(4), /* Enable FIS receive DMA engine */
177 PORT_CMD_CLO = BIT(3), /* Command list override */
178 PORT_CMD_POWER_ON = BIT(2), /* Power up device */
179 PORT_CMD_SPIN_UP = BIT(1), /* Spin up device */
180 PORT_CMD_START = BIT(0), /* Enable port DMA engine */
181
182 PORT_CMD_ICC_MASK = (0xfu << 28), /* i/f ICC state mask */
183 PORT_CMD_ICC_ACTIVE = (0x1u << 28), /* Put i/f in active state */
184 PORT_CMD_ICC_PARTIAL = (0x2u << 28), /* Put i/f in partial state */
185 PORT_CMD_ICC_SLUMBER = (0x6u << 28), /* Put i/f in slumber state */
186
187 /* PORT_CMD capabilities mask */
188 PORT_CMD_CAP = PORT_CMD_HPCP | PORT_CMD_MPSP |
189 PORT_CMD_CPD | PORT_CMD_ESP | PORT_CMD_FBSCP,
190
191 /* PORT_FBS bits */
192 PORT_FBS_DWE_OFFSET = 16, /* FBS device with error offset */
193 PORT_FBS_ADO_OFFSET = 12, /* FBS active dev optimization offset */
194 PORT_FBS_DEV_OFFSET = 8, /* FBS device to issue offset */
195 PORT_FBS_DEV_MASK = (0xf << PORT_FBS_DEV_OFFSET), /* FBS.DEV */
196 PORT_FBS_SDE = BIT(2), /* FBS single device error */
197 PORT_FBS_DEC = BIT(1), /* FBS device error clear */
198 PORT_FBS_EN = BIT(0), /* Enable FBS */
199
200 /* PORT_DEVSLP bits */
201 PORT_DEVSLP_DM_OFFSET = 25, /* DITO multiplier offset */
202 PORT_DEVSLP_DM_MASK = (0xf << 25), /* DITO multiplier mask */
203 PORT_DEVSLP_DITO_OFFSET = 15, /* DITO offset */
204 PORT_DEVSLP_MDAT_OFFSET = 10, /* Minimum assertion time */
205 PORT_DEVSLP_DETO_OFFSET = 2, /* DevSlp exit timeout */
206 PORT_DEVSLP_DSP = BIT(1), /* DevSlp present */
207 PORT_DEVSLP_ADSE = BIT(0), /* Aggressive DevSlp enable */
208
209 /* hpriv->flags bits */
210
211#define AHCI_HFLAGS(flags) .private_data = (void *)(flags)
212
213 AHCI_HFLAG_NO_NCQ = BIT(0),
214 AHCI_HFLAG_IGN_IRQ_IF_ERR = BIT(1), /* ignore IRQ_IF_ERR */
215 AHCI_HFLAG_IGN_SERR_INTERNAL = BIT(2), /* ignore SERR_INTERNAL */
216 AHCI_HFLAG_32BIT_ONLY = BIT(3), /* force 32bit */
217 AHCI_HFLAG_MV_PATA = BIT(4), /* PATA port */
218 AHCI_HFLAG_NO_MSI = BIT(5), /* no PCI MSI */
219 AHCI_HFLAG_NO_PMP = BIT(6), /* no PMP */
220 AHCI_HFLAG_SECT255 = BIT(8), /* max 255 sectors */
221 AHCI_HFLAG_YES_NCQ = BIT(9), /* force NCQ cap on */
222 AHCI_HFLAG_NO_SUSPEND = BIT(10), /* don't suspend */
223 AHCI_HFLAG_SRST_TOUT_IS_OFFLINE = BIT(11), /* treat SRST timeout as
224 link offline */
225 AHCI_HFLAG_NO_SNTF = BIT(12), /* no sntf */
226 AHCI_HFLAG_NO_FPDMA_AA = BIT(13), /* no FPDMA AA */
227 AHCI_HFLAG_YES_FBS = BIT(14), /* force FBS cap on */
228 AHCI_HFLAG_DELAY_ENGINE = BIT(15), /* do not start engine on
229 port start (wait until
230 error-handling stage) */
231 AHCI_HFLAG_NO_DEVSLP = BIT(17), /* no device sleep */
232 AHCI_HFLAG_NO_FBS = BIT(18), /* no FBS */
233
234#ifdef CONFIG_PCI_MSI
235 AHCI_HFLAG_MULTI_MSI = BIT(20), /* per-port MSI(-X) */
236#else
237 /* compile out MSI infrastructure */
238 AHCI_HFLAG_MULTI_MSI = 0,
239#endif
240 AHCI_HFLAG_WAKE_BEFORE_STOP = BIT(22), /* wake before DMA stop */
241 AHCI_HFLAG_YES_ALPM = BIT(23), /* force ALPM cap on */
242 AHCI_HFLAG_NO_WRITE_TO_RO = BIT(24), /* don't write to read
243 only registers */
244 AHCI_HFLAG_USE_LPM_POLICY = BIT(25), /* chipset that should use
245 SATA_MOBILE_LPM_POLICY
246 as default lpm_policy */
247 AHCI_HFLAG_SUSPEND_PHYS = BIT(26), /* handle PHYs during
248 suspend/resume */
249 AHCI_HFLAG_NO_SXS = BIT(28), /* SXS not supported */
250 AHCI_HFLAG_43BIT_ONLY = BIT(29), /* 43bit DMA addr limit */
251
252 /* ap->flags bits */
253
254 AHCI_FLAG_COMMON = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA |
255 ATA_FLAG_ACPI_SATA | ATA_FLAG_AN,
256
257 ICH_MAP = 0x90, /* ICH MAP register */
258 PCS_6 = 0x92, /* 6 port PCS */
259 PCS_7 = 0x94, /* 7+ port PCS (Denverton) */
260
261 /* em constants */
262 EM_MAX_SLOTS = SATA_PMP_MAX_PORTS,
263 EM_MAX_RETRY = 5,
264
265 /* em_ctl bits */
266 EM_CTL_RST = BIT(9), /* Reset */
267 EM_CTL_TM = BIT(8), /* Transmit Message */
268 EM_CTL_MR = BIT(0), /* Message Received */
269 EM_CTL_ALHD = BIT(26), /* Activity LED */
270 EM_CTL_XMT = BIT(25), /* Transmit Only */
271 EM_CTL_SMB = BIT(24), /* Single Message Buffer */
272 EM_CTL_SGPIO = BIT(19), /* SGPIO messages supported */
273 EM_CTL_SES = BIT(18), /* SES-2 messages supported */
274 EM_CTL_SAFTE = BIT(17), /* SAF-TE messages supported */
275 EM_CTL_LED = BIT(16), /* LED messages supported */
276
277 /* em message type */
278 EM_MSG_TYPE_LED = BIT(0), /* LED */
279 EM_MSG_TYPE_SAFTE = BIT(1), /* SAF-TE */
280 EM_MSG_TYPE_SES2 = BIT(2), /* SES-2 */
281 EM_MSG_TYPE_SGPIO = BIT(3), /* SGPIO */
282};
283
284struct ahci_cmd_hdr {
285 __le32 opts;
286 __le32 status;
287 __le32 tbl_addr;
288 __le32 tbl_addr_hi;
289 __le32 reserved[4];
290};
291
292struct ahci_sg {
293 __le32 addr;
294 __le32 addr_hi;
295 __le32 reserved;
296 __le32 flags_size;
297};
298
299struct ahci_em_priv {
300 enum sw_activity blink_policy;
301 struct timer_list timer;
302 unsigned long saved_activity;
303 unsigned long activity;
304 unsigned long led_state;
305 struct ata_link *link;
306};
307
308struct ahci_port_priv {
309 struct ata_link *active_link;
310 struct ahci_cmd_hdr *cmd_slot;
311 dma_addr_t cmd_slot_dma;
312 void *cmd_tbl;
313 dma_addr_t cmd_tbl_dma;
314 void *rx_fis;
315 dma_addr_t rx_fis_dma;
316 /* for NCQ spurious interrupt analysis */
317 unsigned int ncq_saw_d2h:1;
318 unsigned int ncq_saw_dmas:1;
319 unsigned int ncq_saw_sdb:1;
320 spinlock_t lock; /* protects parent ata_port */
321 u32 intr_mask; /* interrupts to enable */
322 bool fbs_supported; /* set iff FBS is supported */
323 bool fbs_enabled; /* set iff FBS is enabled */
324 int fbs_last_dev; /* save FBS.DEV of last FIS */
325 /* enclosure management info per PM slot */
326 struct ahci_em_priv em_priv[EM_MAX_SLOTS];
327 char *irq_desc; /* desc in /proc/interrupts */
328};
329
330struct ahci_host_priv {
331 /* Input fields */
332 unsigned int flags; /* AHCI_HFLAG_* */
333 u32 mask_port_map; /* mask out particular bits */
334
335 void __iomem * mmio; /* bus-independent mem map */
336 u32 cap; /* cap to use */
337 u32 cap2; /* cap2 to use */
338 u32 version; /* cached version */
339 u32 port_map; /* port map to use */
340 u32 saved_cap; /* saved initial cap */
341 u32 saved_cap2; /* saved initial cap2 */
342 u32 saved_port_map; /* saved initial port_map */
343 u32 saved_port_cap[AHCI_MAX_PORTS]; /* saved port_cap */
344 u32 em_loc; /* enclosure management location */
345 u32 em_buf_sz; /* EM buffer size in byte */
346 u32 em_msg_type; /* EM message type */
347 u32 remapped_nvme; /* NVMe remapped device count */
348 bool got_runtime_pm; /* Did we do pm_runtime_get? */
349 unsigned int n_clks;
350 struct clk_bulk_data *clks; /* Optional */
351 unsigned int f_rsts;
352 struct reset_control *rsts; /* Optional */
353 struct regulator **target_pwrs; /* Optional */
354 struct regulator *ahci_regulator;/* Optional */
355 struct regulator *phy_regulator;/* Optional */
356 /*
357 * If platform uses PHYs. There is a 1:1 relation between the port number and
358 * the PHY position in this array.
359 */
360 struct phy **phys;
361 unsigned nports; /* Number of ports */
362 void *plat_data; /* Other platform data */
363 unsigned int irq; /* interrupt line */
364 /*
365 * Optional ahci_start_engine override, if not set this gets set to the
366 * default ahci_start_engine during ahci_save_initial_config, this can
367 * be overridden anytime before the host is activated.
368 */
369 void (*start_engine)(struct ata_port *ap);
370 /*
371 * Optional ahci_stop_engine override, if not set this gets set to the
372 * default ahci_stop_engine during ahci_save_initial_config, this can
373 * be overridden anytime before the host is activated.
374 */
375 int (*stop_engine)(struct ata_port *ap);
376
377 irqreturn_t (*irq_handler)(int irq, void *dev_instance);
378
379 /* only required for per-port MSI(-X) support */
380 int (*get_irq_vector)(struct ata_host *host,
381 int port);
382};
383
384extern int ahci_ignore_sss;
385
386extern const struct attribute_group *ahci_shost_groups[];
387extern const struct attribute_group *ahci_sdev_groups[];
388
389/*
390 * This must be instantiated by the edge drivers. Read the comments
391 * for ATA_BASE_SHT
392 */
393#define AHCI_SHT(drv_name) \
394 __ATA_BASE_SHT(drv_name), \
395 .can_queue = AHCI_MAX_CMDS, \
396 .sg_tablesize = AHCI_MAX_SG, \
397 .dma_boundary = AHCI_DMA_BOUNDARY, \
398 .shost_groups = ahci_shost_groups, \
399 .sdev_groups = ahci_sdev_groups, \
400 .change_queue_depth = ata_scsi_change_queue_depth, \
401 .tag_alloc_policy = BLK_TAG_ALLOC_RR, \
402 .slave_configure = ata_scsi_slave_config
403
404extern struct ata_port_operations ahci_ops;
405extern struct ata_port_operations ahci_platform_ops;
406extern struct ata_port_operations ahci_pmp_retry_srst_ops;
407
408unsigned int ahci_dev_classify(struct ata_port *ap);
409void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
410 u32 opts);
411void ahci_save_initial_config(struct device *dev,
412 struct ahci_host_priv *hpriv);
413void ahci_init_controller(struct ata_host *host);
414int ahci_reset_controller(struct ata_host *host);
415
416int ahci_do_softreset(struct ata_link *link, unsigned int *class,
417 int pmp, unsigned long deadline,
418 int (*check_ready)(struct ata_link *link));
419
420int ahci_do_hardreset(struct ata_link *link, unsigned int *class,
421 unsigned long deadline, bool *online);
422
423unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
424int ahci_stop_engine(struct ata_port *ap);
425void ahci_start_fis_rx(struct ata_port *ap);
426void ahci_start_engine(struct ata_port *ap);
427int ahci_check_ready(struct ata_link *link);
428int ahci_kick_engine(struct ata_port *ap);
429int ahci_port_resume(struct ata_port *ap);
430void ahci_set_em_messages(struct ahci_host_priv *hpriv,
431 struct ata_port_info *pi);
432int ahci_reset_em(struct ata_host *host);
433void ahci_print_info(struct ata_host *host, const char *scc_s);
434int ahci_host_activate(struct ata_host *host, const struct scsi_host_template *sht);
435void ahci_error_handler(struct ata_port *ap);
436u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked);
437
438static inline void __iomem *__ahci_port_base(struct ahci_host_priv *hpriv,
439 unsigned int port_no)
440{
441 void __iomem *mmio = hpriv->mmio;
442
443 return mmio + 0x100 + (port_no * 0x80);
444}
445
446static inline void __iomem *ahci_port_base(struct ata_port *ap)
447{
448 struct ahci_host_priv *hpriv = ap->host->private_data;
449
450 return __ahci_port_base(hpriv, ap->port_no);
451}
452
453static inline int ahci_nr_ports(u32 cap)
454{
455 return (cap & 0x1f) + 1;
456}
457
458#endif /* _AHCI_H */
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
39enum {
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 PCS_6 = 0x92, /* 6 port PCS */
251 PCS_7 = 0x94, /* 7+ port PCS (Denverton) */
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
276struct ahci_cmd_hdr {
277 __le32 opts;
278 __le32 status;
279 __le32 tbl_addr;
280 __le32 tbl_addr_hi;
281 __le32 reserved[4];
282};
283
284struct ahci_sg {
285 __le32 addr;
286 __le32 addr_hi;
287 __le32 reserved;
288 __le32 flags_size;
289};
290
291struct 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 struct ata_link *link;
298};
299
300struct ahci_port_priv {
301 struct ata_link *active_link;
302 struct ahci_cmd_hdr *cmd_slot;
303 dma_addr_t cmd_slot_dma;
304 void *cmd_tbl;
305 dma_addr_t cmd_tbl_dma;
306 void *rx_fis;
307 dma_addr_t rx_fis_dma;
308 /* for NCQ spurious interrupt analysis */
309 unsigned int ncq_saw_d2h:1;
310 unsigned int ncq_saw_dmas:1;
311 unsigned int ncq_saw_sdb:1;
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
322struct 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 version; /* cached version */
332 u32 port_map; /* port map to use */
333 u32 saved_cap; /* saved initial cap */
334 u32 saved_cap2; /* saved initial cap2 */
335 u32 saved_port_map; /* saved initial port_map */
336 u32 em_loc; /* enclosure management location */
337 u32 em_buf_sz; /* EM buffer size in byte */
338 u32 em_msg_type; /* EM message type */
339 bool got_runtime_pm; /* Did we do pm_runtime_get? */
340 struct clk *clks[AHCI_MAX_CLKS]; /* Optional */
341 struct reset_control *rsts; /* Optional */
342 struct regulator **target_pwrs; /* Optional */
343 struct regulator *ahci_regulator;/* Optional */
344 struct regulator *phy_regulator;/* Optional */
345 /*
346 * If platform uses PHYs. There is a 1:1 relation between the port number and
347 * the PHY position in this array.
348 */
349 struct phy **phys;
350 unsigned nports; /* Number of ports */
351 void *plat_data; /* Other platform data */
352 unsigned int irq; /* interrupt line */
353 /*
354 * Optional ahci_start_engine override, if not set this gets set to the
355 * default ahci_start_engine during ahci_save_initial_config, this can
356 * be overridden anytime before the host is activated.
357 */
358 void (*start_engine)(struct ata_port *ap);
359 /*
360 * Optional ahci_stop_engine override, if not set this gets set to the
361 * default ahci_stop_engine during ahci_save_initial_config, this can
362 * be overridden anytime before the host is activated.
363 */
364 int (*stop_engine)(struct ata_port *ap);
365
366 irqreturn_t (*irq_handler)(int irq, void *dev_instance);
367
368 /* only required for per-port MSI(-X) support */
369 int (*get_irq_vector)(struct ata_host *host,
370 int port);
371};
372
373extern int ahci_ignore_sss;
374
375extern struct device_attribute *ahci_shost_attrs[];
376extern struct device_attribute *ahci_sdev_attrs[];
377
378/*
379 * This must be instantiated by the edge drivers. Read the comments
380 * for ATA_BASE_SHT
381 */
382#define AHCI_SHT(drv_name) \
383 ATA_NCQ_SHT(drv_name), \
384 .can_queue = AHCI_MAX_CMDS, \
385 .sg_tablesize = AHCI_MAX_SG, \
386 .dma_boundary = AHCI_DMA_BOUNDARY, \
387 .shost_attrs = ahci_shost_attrs, \
388 .sdev_attrs = ahci_sdev_attrs
389
390extern struct ata_port_operations ahci_ops;
391extern struct ata_port_operations ahci_platform_ops;
392extern struct ata_port_operations ahci_pmp_retry_srst_ops;
393
394unsigned int ahci_dev_classify(struct ata_port *ap);
395void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
396 u32 opts);
397void ahci_save_initial_config(struct device *dev,
398 struct ahci_host_priv *hpriv);
399void ahci_init_controller(struct ata_host *host);
400int ahci_reset_controller(struct ata_host *host);
401
402int ahci_do_softreset(struct ata_link *link, unsigned int *class,
403 int pmp, unsigned long deadline,
404 int (*check_ready)(struct ata_link *link));
405
406int ahci_do_hardreset(struct ata_link *link, unsigned int *class,
407 unsigned long deadline, bool *online);
408
409unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
410int ahci_stop_engine(struct ata_port *ap);
411void ahci_start_fis_rx(struct ata_port *ap);
412void ahci_start_engine(struct ata_port *ap);
413int ahci_check_ready(struct ata_link *link);
414int ahci_kick_engine(struct ata_port *ap);
415int ahci_port_resume(struct ata_port *ap);
416void ahci_set_em_messages(struct ahci_host_priv *hpriv,
417 struct ata_port_info *pi);
418int ahci_reset_em(struct ata_host *host);
419void ahci_print_info(struct ata_host *host, const char *scc_s);
420int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht);
421void ahci_error_handler(struct ata_port *ap);
422u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked);
423
424static inline void __iomem *__ahci_port_base(struct ata_host *host,
425 unsigned int port_no)
426{
427 struct ahci_host_priv *hpriv = host->private_data;
428 void __iomem *mmio = hpriv->mmio;
429
430 return mmio + 0x100 + (port_no * 0x80);
431}
432
433static inline void __iomem *ahci_port_base(struct ata_port *ap)
434{
435 return __ahci_port_base(ap->host, ap->port_no);
436}
437
438static inline int ahci_nr_ports(u32 cap)
439{
440 return (cap & 0x1f) + 1;
441}
442
443#endif /* _AHCI_H */