Zephyr Project API 4.4.99
A Scalable Open Source RTOS
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pcie.h
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1/*
2 * Copyright (c) 2019 Intel Corporation
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
12
13#ifndef ZEPHYR_INCLUDE_DRIVERS_PCIE_PCIE_H_
14#define ZEPHYR_INCLUDE_DRIVERS_PCIE_PCIE_H_
15
28
29#include <stddef.h>
30#include <zephyr/devicetree.h>
32#include <zephyr/types.h>
33#include <zephyr/kernel.h>
35
36#ifdef __cplusplus
37extern "C" {
38#endif
39
49
58
59/* Helper macro to exclude invalid PCIe identifiers. We should really only
60 * need to look for PCIE_ID_NONE, but because of some broken PCI host controllers
61 * we have try cases where both VID & DID are zero or just one of them is
62 * zero (0x0000) and the other is all ones (0xFFFF).
63 */
64#define PCIE_ID_IS_VALID(id) ((id != PCIE_ID_NONE) && \
65 (id != PCIE_ID(0x0000, 0x0000)) && \
66 (id != PCIE_ID(0xFFFF, 0x0000)) && \
67 (id != PCIE_ID(0x0000, 0xFFFF)))
68
75
76#define Z_DEVICE_PCIE_NAME(node_id) _CONCAT(pcie_dev_, DT_DEP_ORD(node_id))
77
84#define PCIE_DT_ID(node_id) PCIE_ID(DT_PROP_OR(node_id, vendor_id, 0xffff), \
85 DT_PROP_OR(node_id, device_id, 0xffff))
86
96#define PCIE_DT_INST_ID(inst) PCIE_DT_ID(DT_DRV_INST(inst))
97
106#define DEVICE_PCIE_DECLARE(node_id) \
107 STRUCT_SECTION_ITERABLE(pcie_dev, Z_DEVICE_PCIE_NAME(node_id)) = { \
108 .bdf = PCIE_BDF_NONE, \
109 .id = PCIE_DT_ID(node_id), \
110 .class_rev = DT_PROP_OR(node_id, class_rev, 0), \
111 .class_rev_mask = DT_PROP_OR(node_id, class_rev_mask, 0), \
112 }
113
122#define DEVICE_PCIE_INST_DECLARE(inst) DEVICE_PCIE_DECLARE(DT_DRV_INST(inst))
123
148#define DEVICE_PCIE_INIT(node_id, name) .name = &Z_DEVICE_PCIE_NAME(node_id)
149
159#define DEVICE_PCIE_INST_INIT(inst, name) \
160 DEVICE_PCIE_INIT(DT_DRV_INST(inst), name)
161
162struct pcie_bar {
164 size_t size;
165};
166
167/*
168 * These functions are arch-, board-, or SoC-specific.
169 */
170
180extern uint32_t pcie_conf_read(pcie_bdf_t bdf, unsigned int reg);
181
191extern void pcie_conf_write(pcie_bdf_t bdf, unsigned int reg, uint32_t data);
192
201typedef bool (*pcie_scan_cb_t)(pcie_bdf_t bdf, pcie_id_t id, void *cb_data);
202
203enum {
208};
209
227
235int pcie_scan(const struct pcie_scan_opt *opt);
236
244extern bool pcie_get_mbar(pcie_bdf_t bdf,
245 unsigned int bar_index,
246 struct pcie_bar *mbar);
247
262 unsigned int index,
263 struct pcie_bar *mbar);
264
273 unsigned int bar_index,
274 struct pcie_bar *iobar);
275
290 unsigned int index,
291 struct pcie_bar *iobar);
292
300extern void pcie_set_cmd(pcie_bdf_t bdf, uint32_t bits, bool on);
301
302#ifndef CONFIG_PCIE_CONTROLLER
316extern unsigned int pcie_alloc_irq(pcie_bdf_t bdf);
317#endif /* CONFIG_PCIE_CONTROLLER */
318
325extern unsigned int pcie_get_irq(pcie_bdf_t bdf);
326
339extern void pcie_irq_enable(pcie_bdf_t bdf, unsigned int irq);
340
349
358
371 unsigned int irq,
372 unsigned int priority,
373 void (*routine)(const void *parameter),
374 const void *parameter,
376
387#define PCIE_HOST_CONTROLLER(n) PCIE_BDF(0, 0, n)
388
389/*
390 * Configuration word 13 contains the head of the capabilities list.
391 */
392
393#define PCIE_CONF_CAPPTR 13U /* capabilities pointer */
394#define PCIE_CONF_CAPPTR_FIRST(w) (((w) >> 2) & 0x3FU)
395
396/*
397 * The first word of every capability contains a capability identifier,
398 * and a link to the next capability (or 0) in configuration space.
399 */
400
401#define PCIE_CONF_CAP_ID(w) ((w) & 0xFFU)
402#define PCIE_CONF_CAP_NEXT(w) (((w) >> 10) & 0x3FU)
403
404/*
405 * The extended PCI Express capabilities lie at the end of the PCI configuration space
406 */
407
408#define PCIE_CONF_EXT_CAPPTR 64U
409
410/*
411 * The first word of every capability contains an extended capability identifier,
412 * and a link to the next capability (or 0) in the extended configuration space.
413 */
414
415#define PCIE_CONF_EXT_CAP_ID(w) ((w) & 0xFFFFU)
416#define PCIE_CONF_EXT_CAP_VER(w) (((w) >> 16) & 0xFU)
417#define PCIE_CONF_EXT_CAP_NEXT(w) (((w) >> 20) & 0xFFFU)
418
419/*
420 * Configuration word 0 aligns directly with pcie_id_t.
421 */
422
423#define PCIE_CONF_ID 0U
424
425/*
426 * Configuration word 1 contains command and status bits.
427 */
428
429#define PCIE_CONF_CMDSTAT 1U /* command/status register */
430
431#define PCIE_CONF_CMDSTAT_IO 0x00000001U /* I/O access enable */
432#define PCIE_CONF_CMDSTAT_MEM 0x00000002U /* mem access enable */
433#define PCIE_CONF_CMDSTAT_MASTER 0x00000004U /* bus master enable */
434#define PCIE_CONF_CMDSTAT_SERR 0x00000100U /* SERR# enable */
435#define PCIE_CONF_CMDSTAT_INTERRUPT 0x00080000U /* interrupt status */
436#define PCIE_CONF_CMDSTAT_CAPS 0x00100000U /* capabilities list */
437
438/*
439 * Configuration word 2 has additional function identification that
440 * we only care about for debug output (PCIe shell commands).
441 */
442
443#define PCIE_CONF_CLASSREV 2U /* class/revision register */
444
445#define PCIE_CONF_CLASSREV_CLASS(w) (((w) >> 24) & 0xFFU)
446#define PCIE_CONF_CLASSREV_SUBCLASS(w) (((w) >> 16) & 0xFFU)
447#define PCIE_CONF_CLASSREV_PROGIF(w) (((w) >> 8) & 0xFFU)
448#define PCIE_CONF_CLASSREV_REV(w) ((w) & 0xFFU)
449
450/*
451 * The only part of configuration word 3 that is of interest to us is
452 * the header type, as we use it to distinguish functional endpoints
453 * from bridges (which are, for our purposes, transparent).
454 */
455
456#define PCIE_CONF_TYPE 3U
457
458#define PCIE_CONF_MULTIFUNCTION(w) (((w) & 0x00800000U) != 0U)
459#define PCIE_CONF_TYPE_BRIDGE(w) (((w) & 0x007F0000U) != 0U)
460#define PCIE_CONF_TYPE_GET(w) (((w) >> 16) & 0x7F)
461
462#define PCIE_CONF_TYPE_STANDARD 0x0U
463#define PCIE_CONF_TYPE_PCI_BRIDGE 0x1U
464#define PCIE_CONF_TYPE_CARDBUS_BRIDGE 0x2U
465
466/*
467 * Words 4-9 are BARs are I/O or memory decoders. Memory decoders may
468 * be 64-bit decoders, in which case the next configuration word holds
469 * the high-order bits (and is, thus, not a BAR itself).
470 */
471
472#define PCIE_CONF_BAR0 4U
473#define PCIE_CONF_BAR1 5U
474#define PCIE_CONF_BAR2 6U
475#define PCIE_CONF_BAR3 7U
476#define PCIE_CONF_BAR4 8U
477#define PCIE_CONF_BAR5 9U
478
479#define PCIE_CONF_BAR_IO(w) (((w) & 0x00000001U) == 0x00000001U)
480#define PCIE_CONF_BAR_MEM(w) (((w) & 0x00000001U) != 0x00000001U)
481#define PCIE_CONF_BAR_64(w) (((w) & 0x00000006U) == 0x00000004U)
482#define PCIE_CONF_BAR_ADDR(w) ((w) & ~0xfUL)
483#define PCIE_CONF_BAR_IO_ADDR(w) ((w) & ~0x3UL)
484#define PCIE_CONF_BAR_FLAGS(w) ((w) & 0xfUL)
485#define PCIE_CONF_BAR_NONE 0U
486
487#define PCIE_CONF_BAR_INVAL 0xFFFFFFF0U
488#define PCIE_CONF_BAR_INVAL64 0xFFFFFFFFFFFFFFF0UL
489
490#define PCIE_CONF_BAR_INVAL_FLAGS(w) \
491 ((((w) & 0x00000006U) == 0x00000006U) || \
492 (((w) & 0x00000006U) == 0x00000002U))
493
494/*
495 * Type 1 Header has files related to bus management
496 */
497#define PCIE_BUS_NUMBER 6U
498
499#define PCIE_BUS_PRIMARY_NUMBER(w) ((w) & 0xffUL)
500#define PCIE_BUS_SECONDARY_NUMBER(w) (((w) >> 8) & 0xffUL)
501#define PCIE_BUS_SUBORDINATE_NUMBER(w) (((w) >> 16) & 0xffUL)
502#define PCIE_SECONDARY_LATENCY_TIMER(w) (((w) >> 24) & 0xffUL)
503
504#define PCIE_BUS_NUMBER_VAL(prim, sec, sub, lat) \
505 (((prim) & 0xffUL) | \
506 (((sec) & 0xffUL) << 8) | \
507 (((sub) & 0xffUL) << 16) | \
508 (((lat) & 0xffUL) << 24))
509
510/*
511 * Type 1 words 7 to 12 setups Bridge Memory base and limits
512 */
513#define PCIE_IO_SEC_STATUS 7U
514
515#define PCIE_IO_BASE(w) ((w) & 0xffUL)
516#define PCIE_IO_LIMIT(w) (((w) >> 8) & 0xffUL)
517#define PCIE_SEC_STATUS(w) (((w) >> 16) & 0xffffUL)
518
519#define PCIE_IO_SEC_STATUS_VAL(iob, iol, sec_status) \
520 (((iob) & 0xffUL) | \
521 (((iol) & 0xffUL) << 8) | \
522 (((sec_status) & 0xffffUL) << 16))
523
524#define PCIE_MEM_BASE_LIMIT 8U
525
526#define PCIE_MEM_BASE(w) ((w) & 0xffffUL)
527#define PCIE_MEM_LIMIT(w) (((w) >> 16) & 0xffffUL)
528
529#define PCIE_MEM_BASE_LIMIT_VAL(memb, meml) \
530 (((memb) & 0xffffUL) | \
531 (((meml) & 0xffffUL) << 16))
532
533#define PCIE_PREFETCH_BASE_LIMIT 9U
534
535#define PCIE_PREFETCH_BASE(w) ((w) & 0xffffUL)
536#define PCIE_PREFETCH_LIMIT(w) (((w) >> 16) & 0xffffUL)
537
538#define PCIE_PREFETCH_BASE_LIMIT_VAL(pmemb, pmeml) \
539 (((pmemb) & 0xffffUL) | \
540 (((pmeml) & 0xffffUL) << 16))
541
542#define PCIE_PREFETCH_BASE_UPPER 10U
543
544#define PCIE_PREFETCH_LIMIT_UPPER 11U
545
546#define PCIE_IO_BASE_LIMIT_UPPER 12U
547
548#define PCIE_IO_BASE_UPPER(w) ((w) & 0xffffUL)
549#define PCIE_IO_LIMIT_UPPER(w) (((w) >> 16) & 0xffffUL)
550
551#define PCIE_IO_BASE_LIMIT_UPPER_VAL(iobu, iolu) \
552 (((iobu) & 0xffffUL) | \
553 (((iolu) & 0xffffUL) << 16))
554
555/*
556 * Word 15 contains information related to interrupts.
557 *
558 * We're only interested in the low byte, which is [supposed to be] set by
559 * the firmware to indicate which wire IRQ the device interrupt is routed to.
560 */
561
562#define PCIE_CONF_INTR 15U
563
564#define PCIE_CONF_INTR_IRQ(w) ((w) & 0xFFU)
565#define PCIE_CONF_INTR_IRQ_NONE 0xFFU /* no interrupt routed */
566
567#define PCIE_MAX_BUS (0xFFFFFFFFU & PCIE_BDF_BUS_MASK)
568#define PCIE_MAX_DEV (0xFFFFFFFFU & PCIE_BDF_DEV_MASK)
569#define PCIE_MAX_FUNC (0xFFFFFFFFU & PCIE_BDF_FUNC_MASK)
570
585#define PCIE_IRQ_CONNECT(bdf_p, irq_p, priority_p, \
586 isr_p, isr_param_p, flags_p) \
587 ARCH_PCIE_IRQ_CONNECT(bdf_p, irq_p, priority_p, \
588 isr_p, isr_param_p, flags_p)
589
590#ifdef __cplusplus
591}
592#endif
593
597
598#endif /* ZEPHYR_INCLUDE_DRIVERS_PCIE_PCIE_H_ */
Devicetree main header.
uint32_t pcie_conf_read(pcie_bdf_t bdf, unsigned int reg)
Read a 32-bit word from an endpoint's configuration space.
bool pcie_connect_dynamic_irq(pcie_bdf_t bdf, unsigned int irq, unsigned int priority, void(*routine)(const void *parameter), const void *parameter, uint32_t flags)
Dynamically connect a PCIe endpoint IRQ to an ISR handler.
uint32_t pcie_id_t
A unique PCI(e) identifier (vendor ID, device ID).
Definition pcie.h:57
void pcie_set_cmd(pcie_bdf_t bdf, uint32_t bits, bool on)
Set or reset bits in the endpoint command/status register.
bool pcie_get_iobar(pcie_bdf_t bdf, unsigned int bar_index, struct pcie_bar *iobar)
Get the I/O BAR at a specific BAR index.
void pcie_conf_write(pcie_bdf_t bdf, unsigned int reg, uint32_t data)
Write a 32-bit word to an endpoint's configuration space.
uint32_t pcie_get_cap(pcie_bdf_t bdf, uint32_t cap_id)
Find a PCI(e) capability in an endpoint's configuration space.
uint32_t pcie_get_ext_cap(pcie_bdf_t bdf, uint32_t cap_id)
Find an Extended PCI(e) capability in an endpoint's configuration space.
bool(* pcie_scan_cb_t)(pcie_bdf_t bdf, pcie_id_t id, void *cb_data)
Callback type used for scanning for PCI endpoints.
Definition pcie.h:201
int pcie_scan(const struct pcie_scan_opt *opt)
Scan for PCIe devices.
bool pcie_probe_iobar(pcie_bdf_t bdf, unsigned int index, struct pcie_bar *iobar)
Probe the nth I/O BAR address assigned to an endpoint.
unsigned int pcie_alloc_irq(pcie_bdf_t bdf)
Allocate an IRQ for an endpoint.
bool pcie_probe_mbar(pcie_bdf_t bdf, unsigned int index, struct pcie_bar *mbar)
Probe the nth MMIO address assigned to an endpoint.
bool pcie_get_mbar(pcie_bdf_t bdf, unsigned int bar_index, struct pcie_bar *mbar)
Get the MBAR at a specific BAR index.
unsigned int pcie_get_irq(pcie_bdf_t bdf)
Return the IRQ assigned by the firmware/board to an endpoint.
uint32_t pcie_bdf_t
A unique PCI(e) endpoint (bus, device, function).
Definition pcie.h:48
void pcie_irq_enable(pcie_bdf_t bdf, unsigned int irq)
Enable the PCI(e) endpoint to generate the specified IRQ.
@ PCIE_SCAN_RECURSIVE
Scan all available PCI host controllers and sub-buses.
Definition pcie.h:205
@ PCIE_SCAN_CB_ALL
Do the callback for all endpoint types, including bridges.
Definition pcie.h:207
#define BIT(n)
Unsigned integer with bit position n set (signed in assembly language).
Definition util_macro.h:44
Public kernel APIs.
flags
Definition parser.h:97
#define bool
Definition stdbool.h:13
__UINT32_TYPE__ uint32_t
Definition stdint.h:90
__UINT8_TYPE__ uint8_t
Definition stdint.h:88
__UINTPTR_TYPE__ uintptr_t
Definition stdint.h:105
Definition pcie.h:162
uintptr_t phys_addr
Definition pcie.h:163
size_t size
Definition pcie.h:164
Definition pcie.h:69
pcie_id_t id
Definition pcie.h:71
uint32_t class_rev_mask
Definition pcie.h:73
pcie_bdf_t bdf
Definition pcie.h:70
uint32_t class_rev
Definition pcie.h:72
Options for performing a scan for PCI devices.
Definition pcie.h:211
uint8_t bus
Initial bus number to scan.
Definition pcie.h:213
void * cb_data
Custom data to pass to the scan callback.
Definition pcie.h:219
pcie_scan_cb_t cb
Function to call for each found endpoint.
Definition pcie.h:216
uint32_t flags
Scan flags.
Definition pcie.h:222
bool(* scan_masking_fn)(pcie_bdf_t bdf)
Function to call to determine if a BDF is masked.
Definition pcie.h:225
Iterable sections helpers.