Zephyr Project API 4.2.99
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
7#ifndef ZEPHYR_INCLUDE_DRIVERS_PCIE_PCIE_H_
8#define ZEPHYR_INCLUDE_DRIVERS_PCIE_PCIE_H_
9
23#include <stddef.h>
24#include <zephyr/devicetree.h>
26#include <zephyr/types.h>
27#include <zephyr/kernel.h>
29
30#ifdef __cplusplus
31extern "C" {
32#endif
33
44
54
55/* Helper macro to exclude invalid PCIe identifiers. We should really only
56 * need to look for PCIE_ID_NONE, but because of some broken PCI host controllers
57 * we have try cases where both VID & DID are zero or just one of them is
58 * zero (0x0000) and the other is all ones (0xFFFF).
59 */
60#define PCIE_ID_IS_VALID(id) ((id != PCIE_ID_NONE) && \
61 (id != PCIE_ID(0x0000, 0x0000)) && \
62 (id != PCIE_ID(0xFFFF, 0x0000)) && \
63 (id != PCIE_ID(0x0000, 0xFFFF)))
64
71
72#define Z_DEVICE_PCIE_NAME(node_id) _CONCAT(pcie_dev_, DT_DEP_ORD(node_id))
73
80#define PCIE_DT_ID(node_id) PCIE_ID(DT_PROP_OR(node_id, vendor_id, 0xffff), \
81 DT_PROP_OR(node_id, device_id, 0xffff))
82
92#define PCIE_DT_INST_ID(inst) PCIE_DT_ID(DT_DRV_INST(inst))
93
102#define DEVICE_PCIE_DECLARE(node_id) \
103 STRUCT_SECTION_ITERABLE(pcie_dev, Z_DEVICE_PCIE_NAME(node_id)) = { \
104 .bdf = PCIE_BDF_NONE, \
105 .id = PCIE_DT_ID(node_id), \
106 .class_rev = DT_PROP_OR(node_id, class_rev, 0), \
107 .class_rev_mask = DT_PROP_OR(node_id, class_rev_mask, 0), \
108 }
109
118#define DEVICE_PCIE_INST_DECLARE(inst) DEVICE_PCIE_DECLARE(DT_DRV_INST(inst))
119
144#define DEVICE_PCIE_INIT(node_id, name) .name = &Z_DEVICE_PCIE_NAME(node_id)
145
155#define DEVICE_PCIE_INST_INIT(inst, name) \
156 DEVICE_PCIE_INIT(DT_DRV_INST(inst), name)
157
158struct pcie_bar {
160 size_t size;
161};
162
163/*
164 * These functions are arch-, board-, or SoC-specific.
165 */
166
176extern uint32_t pcie_conf_read(pcie_bdf_t bdf, unsigned int reg);
177
187extern void pcie_conf_write(pcie_bdf_t bdf, unsigned int reg, uint32_t data);
188
197typedef bool (*pcie_scan_cb_t)(pcie_bdf_t bdf, pcie_id_t id, void *cb_data);
198
199enum {
204};
205
220
228int pcie_scan(const struct pcie_scan_opt *opt);
229
237extern bool pcie_get_mbar(pcie_bdf_t bdf,
238 unsigned int bar_index,
239 struct pcie_bar *mbar);
240
255 unsigned int index,
256 struct pcie_bar *mbar);
257
266 unsigned int bar_index,
267 struct pcie_bar *iobar);
268
283 unsigned int index,
284 struct pcie_bar *iobar);
285
293extern void pcie_set_cmd(pcie_bdf_t bdf, uint32_t bits, bool on);
294
295#ifndef CONFIG_PCIE_CONTROLLER
309extern unsigned int pcie_alloc_irq(pcie_bdf_t bdf);
310#endif /* CONFIG_PCIE_CONTROLLER */
311
318extern unsigned int pcie_get_irq(pcie_bdf_t bdf);
319
332extern void pcie_irq_enable(pcie_bdf_t bdf, unsigned int irq);
333
342
351
364 unsigned int irq,
365 unsigned int priority,
366 void (*routine)(const void *parameter),
367 const void *parameter,
369
380#define PCIE_HOST_CONTROLLER(n) PCIE_BDF(0, 0, n)
381
382/*
383 * Configuration word 13 contains the head of the capabilities list.
384 */
385
386#define PCIE_CONF_CAPPTR 13U /* capabilities pointer */
387#define PCIE_CONF_CAPPTR_FIRST(w) (((w) >> 2) & 0x3FU)
388
389/*
390 * The first word of every capability contains a capability identifier,
391 * and a link to the next capability (or 0) in configuration space.
392 */
393
394#define PCIE_CONF_CAP_ID(w) ((w) & 0xFFU)
395#define PCIE_CONF_CAP_NEXT(w) (((w) >> 10) & 0x3FU)
396
397/*
398 * The extended PCI Express capabilities lie at the end of the PCI configuration space
399 */
400
401#define PCIE_CONF_EXT_CAPPTR 64U
402
403/*
404 * The first word of every capability contains an extended capability identifier,
405 * and a link to the next capability (or 0) in the extended configuration space.
406 */
407
408#define PCIE_CONF_EXT_CAP_ID(w) ((w) & 0xFFFFU)
409#define PCIE_CONF_EXT_CAP_VER(w) (((w) >> 16) & 0xFU)
410#define PCIE_CONF_EXT_CAP_NEXT(w) (((w) >> 20) & 0xFFFU)
411
412/*
413 * Configuration word 0 aligns directly with pcie_id_t.
414 */
415
416#define PCIE_CONF_ID 0U
417
418/*
419 * Configuration word 1 contains command and status bits.
420 */
421
422#define PCIE_CONF_CMDSTAT 1U /* command/status register */
423
424#define PCIE_CONF_CMDSTAT_IO 0x00000001U /* I/O access enable */
425#define PCIE_CONF_CMDSTAT_MEM 0x00000002U /* mem access enable */
426#define PCIE_CONF_CMDSTAT_MASTER 0x00000004U /* bus master enable */
427#define PCIE_CONF_CMDSTAT_SERR 0x00000010U /* SERR# enable */
428#define PCIE_CONF_CMDSTAT_INTERRUPT 0x00080000U /* interrupt status */
429#define PCIE_CONF_CMDSTAT_CAPS 0x00100000U /* capabilities list */
430
431/*
432 * Configuration word 2 has additional function identification that
433 * we only care about for debug output (PCIe shell commands).
434 */
435
436#define PCIE_CONF_CLASSREV 2U /* class/revision register */
437
438#define PCIE_CONF_CLASSREV_CLASS(w) (((w) >> 24) & 0xFFU)
439#define PCIE_CONF_CLASSREV_SUBCLASS(w) (((w) >> 16) & 0xFFU)
440#define PCIE_CONF_CLASSREV_PROGIF(w) (((w) >> 8) & 0xFFU)
441#define PCIE_CONF_CLASSREV_REV(w) ((w) & 0xFFU)
442
443/*
444 * The only part of configuration word 3 that is of interest to us is
445 * the header type, as we use it to distinguish functional endpoints
446 * from bridges (which are, for our purposes, transparent).
447 */
448
449#define PCIE_CONF_TYPE 3U
450
451#define PCIE_CONF_MULTIFUNCTION(w) (((w) & 0x00800000U) != 0U)
452#define PCIE_CONF_TYPE_BRIDGE(w) (((w) & 0x007F0000U) != 0U)
453#define PCIE_CONF_TYPE_GET(w) (((w) >> 16) & 0x7F)
454
455#define PCIE_CONF_TYPE_STANDARD 0x0U
456#define PCIE_CONF_TYPE_PCI_BRIDGE 0x1U
457#define PCIE_CONF_TYPE_CARDBUS_BRIDGE 0x2U
458
459/*
460 * Words 4-9 are BARs are I/O or memory decoders. Memory decoders may
461 * be 64-bit decoders, in which case the next configuration word holds
462 * the high-order bits (and is, thus, not a BAR itself).
463 */
464
465#define PCIE_CONF_BAR0 4U
466#define PCIE_CONF_BAR1 5U
467#define PCIE_CONF_BAR2 6U
468#define PCIE_CONF_BAR3 7U
469#define PCIE_CONF_BAR4 8U
470#define PCIE_CONF_BAR5 9U
471
472#define PCIE_CONF_BAR_IO(w) (((w) & 0x00000001U) == 0x00000001U)
473#define PCIE_CONF_BAR_MEM(w) (((w) & 0x00000001U) != 0x00000001U)
474#define PCIE_CONF_BAR_64(w) (((w) & 0x00000006U) == 0x00000004U)
475#define PCIE_CONF_BAR_ADDR(w) ((w) & ~0xfUL)
476#define PCIE_CONF_BAR_IO_ADDR(w) ((w) & ~0x3UL)
477#define PCIE_CONF_BAR_FLAGS(w) ((w) & 0xfUL)
478#define PCIE_CONF_BAR_NONE 0U
479
480#define PCIE_CONF_BAR_INVAL 0xFFFFFFF0U
481#define PCIE_CONF_BAR_INVAL64 0xFFFFFFFFFFFFFFF0UL
482
483#define PCIE_CONF_BAR_INVAL_FLAGS(w) \
484 ((((w) & 0x00000006U) == 0x00000006U) || \
485 (((w) & 0x00000006U) == 0x00000002U))
486
487/*
488 * Type 1 Header has files related to bus management
489 */
490#define PCIE_BUS_NUMBER 6U
491
492#define PCIE_BUS_PRIMARY_NUMBER(w) ((w) & 0xffUL)
493#define PCIE_BUS_SECONDARY_NUMBER(w) (((w) >> 8) & 0xffUL)
494#define PCIE_BUS_SUBORDINATE_NUMBER(w) (((w) >> 16) & 0xffUL)
495#define PCIE_SECONDARY_LATENCY_TIMER(w) (((w) >> 24) & 0xffUL)
496
497#define PCIE_BUS_NUMBER_VAL(prim, sec, sub, lat) \
498 (((prim) & 0xffUL) | \
499 (((sec) & 0xffUL) << 8) | \
500 (((sub) & 0xffUL) << 16) | \
501 (((lat) & 0xffUL) << 24))
502
503/*
504 * Type 1 words 7 to 12 setups Bridge Memory base and limits
505 */
506#define PCIE_IO_SEC_STATUS 7U
507
508#define PCIE_IO_BASE(w) ((w) & 0xffUL)
509#define PCIE_IO_LIMIT(w) (((w) >> 8) & 0xffUL)
510#define PCIE_SEC_STATUS(w) (((w) >> 16) & 0xffffUL)
511
512#define PCIE_IO_SEC_STATUS_VAL(iob, iol, sec_status) \
513 (((iob) & 0xffUL) | \
514 (((iol) & 0xffUL) << 8) | \
515 (((sec_status) & 0xffffUL) << 16))
516
517#define PCIE_MEM_BASE_LIMIT 8U
518
519#define PCIE_MEM_BASE(w) ((w) & 0xffffUL)
520#define PCIE_MEM_LIMIT(w) (((w) >> 16) & 0xffffUL)
521
522#define PCIE_MEM_BASE_LIMIT_VAL(memb, meml) \
523 (((memb) & 0xffffUL) | \
524 (((meml) & 0xffffUL) << 16))
525
526#define PCIE_PREFETCH_BASE_LIMIT 9U
527
528#define PCIE_PREFETCH_BASE(w) ((w) & 0xffffUL)
529#define PCIE_PREFETCH_LIMIT(w) (((w) >> 16) & 0xffffUL)
530
531#define PCIE_PREFETCH_BASE_LIMIT_VAL(pmemb, pmeml) \
532 (((pmemb) & 0xffffUL) | \
533 (((pmeml) & 0xffffUL) << 16))
534
535#define PCIE_PREFETCH_BASE_UPPER 10U
536
537#define PCIE_PREFETCH_LIMIT_UPPER 11U
538
539#define PCIE_IO_BASE_LIMIT_UPPER 12U
540
541#define PCIE_IO_BASE_UPPER(w) ((w) & 0xffffUL)
542#define PCIE_IO_LIMIT_UPPER(w) (((w) >> 16) & 0xffffUL)
543
544#define PCIE_IO_BASE_LIMIT_UPPER_VAL(iobu, iolu) \
545 (((iobu) & 0xffffUL) | \
546 (((iolu) & 0xffffUL) << 16))
547
548/*
549 * Word 15 contains information related to interrupts.
550 *
551 * We're only interested in the low byte, which is [supposed to be] set by
552 * the firmware to indicate which wire IRQ the device interrupt is routed to.
553 */
554
555#define PCIE_CONF_INTR 15U
556
557#define PCIE_CONF_INTR_IRQ(w) ((w) & 0xFFU)
558#define PCIE_CONF_INTR_IRQ_NONE 0xFFU /* no interrupt routed */
559
560#define PCIE_MAX_BUS (0xFFFFFFFFU & PCIE_BDF_BUS_MASK)
561#define PCIE_MAX_DEV (0xFFFFFFFFU & PCIE_BDF_DEV_MASK)
562#define PCIE_MAX_FUNC (0xFFFFFFFFU & PCIE_BDF_FUNC_MASK)
563
578#define PCIE_IRQ_CONNECT(bdf_p, irq_p, priority_p, \
579 isr_p, isr_param_p, flags_p) \
580 ARCH_PCIE_IRQ_CONNECT(bdf_p, irq_p, priority_p, \
581 isr_p, isr_param_p, flags_p)
582
583#ifdef __cplusplus
584}
585#endif
586
591#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.
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.
uint32_t pcie_id_t
A unique PCI(e) identifier (vendor ID, device ID).
Definition pcie.h:53
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.
uint32_t pcie_bdf_t
A unique PCI(e) endpoint (bus, device, function).
Definition pcie.h:43
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:197
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.
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:201
@ PCIE_SCAN_CB_ALL
Do the callback for all endpoint types, including bridges.
Definition pcie.h:203
#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:158
uintptr_t phys_addr
Definition pcie.h:159
size_t size
Definition pcie.h:160
Definition pcie.h:65
pcie_id_t id
Definition pcie.h:67
uint32_t class_rev_mask
Definition pcie.h:69
pcie_bdf_t bdf
Definition pcie.h:66
uint32_t class_rev
Definition pcie.h:68
Options for performing a scan for PCI devices.
Definition pcie.h:207
uint8_t bus
Initial bus number to scan.
Definition pcie.h:209
void * cb_data
Custom data to pass to the scan callback.
Definition pcie.h:215
pcie_scan_cb_t cb
Function to call for each found endpoint.
Definition pcie.h:212
uint32_t flags
Scan flags.
Definition pcie.h:218