Zephyr API Documentation 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
7#ifndef ZEPHYR_INCLUDE_DRIVERS_PCIE_PCIE_H_
8#define ZEPHYR_INCLUDE_DRIVERS_PCIE_PCIE_H_
9
22
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
43
52
53/* Helper macro to exclude invalid PCIe identifiers. We should really only
54 * need to look for PCIE_ID_NONE, but because of some broken PCI host controllers
55 * we have try cases where both VID & DID are zero or just one of them is
56 * zero (0x0000) and the other is all ones (0xFFFF).
57 */
58#define PCIE_ID_IS_VALID(id) ((id != PCIE_ID_NONE) && \
59 (id != PCIE_ID(0x0000, 0x0000)) && \
60 (id != PCIE_ID(0xFFFF, 0x0000)) && \
61 (id != PCIE_ID(0x0000, 0xFFFF)))
62
69
70#define Z_DEVICE_PCIE_NAME(node_id) _CONCAT(pcie_dev_, DT_DEP_ORD(node_id))
71
78#define PCIE_DT_ID(node_id) PCIE_ID(DT_PROP_OR(node_id, vendor_id, 0xffff), \
79 DT_PROP_OR(node_id, device_id, 0xffff))
80
90#define PCIE_DT_INST_ID(inst) PCIE_DT_ID(DT_DRV_INST(inst))
91
100#define DEVICE_PCIE_DECLARE(node_id) \
101 STRUCT_SECTION_ITERABLE(pcie_dev, Z_DEVICE_PCIE_NAME(node_id)) = { \
102 .bdf = PCIE_BDF_NONE, \
103 .id = PCIE_DT_ID(node_id), \
104 .class_rev = DT_PROP_OR(node_id, class_rev, 0), \
105 .class_rev_mask = DT_PROP_OR(node_id, class_rev_mask, 0), \
106 }
107
116#define DEVICE_PCIE_INST_DECLARE(inst) DEVICE_PCIE_DECLARE(DT_DRV_INST(inst))
117
142#define DEVICE_PCIE_INIT(node_id, name) .name = &Z_DEVICE_PCIE_NAME(node_id)
143
153#define DEVICE_PCIE_INST_INIT(inst, name) \
154 DEVICE_PCIE_INIT(DT_DRV_INST(inst), name)
155
156struct pcie_bar {
158 size_t size;
159};
160
161/*
162 * These functions are arch-, board-, or SoC-specific.
163 */
164
174extern uint32_t pcie_conf_read(pcie_bdf_t bdf, unsigned int reg);
175
185extern void pcie_conf_write(pcie_bdf_t bdf, unsigned int reg, uint32_t data);
186
195typedef bool (*pcie_scan_cb_t)(pcie_bdf_t bdf, pcie_id_t id, void *cb_data);
196
197enum {
202};
203
218
226int pcie_scan(const struct pcie_scan_opt *opt);
227
235extern bool pcie_get_mbar(pcie_bdf_t bdf,
236 unsigned int bar_index,
237 struct pcie_bar *mbar);
238
253 unsigned int index,
254 struct pcie_bar *mbar);
255
264 unsigned int bar_index,
265 struct pcie_bar *iobar);
266
281 unsigned int index,
282 struct pcie_bar *iobar);
283
291extern void pcie_set_cmd(pcie_bdf_t bdf, uint32_t bits, bool on);
292
293#ifndef CONFIG_PCIE_CONTROLLER
307extern unsigned int pcie_alloc_irq(pcie_bdf_t bdf);
308#endif /* CONFIG_PCIE_CONTROLLER */
309
316extern unsigned int pcie_get_irq(pcie_bdf_t bdf);
317
330extern void pcie_irq_enable(pcie_bdf_t bdf, unsigned int irq);
331
340
349
362 unsigned int irq,
363 unsigned int priority,
364 void (*routine)(const void *parameter),
365 const void *parameter,
367
378#define PCIE_HOST_CONTROLLER(n) PCIE_BDF(0, 0, n)
379
380/*
381 * Configuration word 13 contains the head of the capabilities list.
382 */
383
384#define PCIE_CONF_CAPPTR 13U /* capabilities pointer */
385#define PCIE_CONF_CAPPTR_FIRST(w) (((w) >> 2) & 0x3FU)
386
387/*
388 * The first word of every capability contains a capability identifier,
389 * and a link to the next capability (or 0) in configuration space.
390 */
391
392#define PCIE_CONF_CAP_ID(w) ((w) & 0xFFU)
393#define PCIE_CONF_CAP_NEXT(w) (((w) >> 10) & 0x3FU)
394
395/*
396 * The extended PCI Express capabilities lie at the end of the PCI configuration space
397 */
398
399#define PCIE_CONF_EXT_CAPPTR 64U
400
401/*
402 * The first word of every capability contains an extended capability identifier,
403 * and a link to the next capability (or 0) in the extended configuration space.
404 */
405
406#define PCIE_CONF_EXT_CAP_ID(w) ((w) & 0xFFFFU)
407#define PCIE_CONF_EXT_CAP_VER(w) (((w) >> 16) & 0xFU)
408#define PCIE_CONF_EXT_CAP_NEXT(w) (((w) >> 20) & 0xFFFU)
409
410/*
411 * Configuration word 0 aligns directly with pcie_id_t.
412 */
413
414#define PCIE_CONF_ID 0U
415
416/*
417 * Configuration word 1 contains command and status bits.
418 */
419
420#define PCIE_CONF_CMDSTAT 1U /* command/status register */
421
422#define PCIE_CONF_CMDSTAT_IO 0x00000001U /* I/O access enable */
423#define PCIE_CONF_CMDSTAT_MEM 0x00000002U /* mem access enable */
424#define PCIE_CONF_CMDSTAT_MASTER 0x00000004U /* bus master enable */
425#define PCIE_CONF_CMDSTAT_SERR 0x00000100U /* SERR# enable */
426#define PCIE_CONF_CMDSTAT_INTERRUPT 0x00080000U /* interrupt status */
427#define PCIE_CONF_CMDSTAT_CAPS 0x00100000U /* capabilities list */
428
429/*
430 * Configuration word 2 has additional function identification that
431 * we only care about for debug output (PCIe shell commands).
432 */
433
434#define PCIE_CONF_CLASSREV 2U /* class/revision register */
435
436#define PCIE_CONF_CLASSREV_CLASS(w) (((w) >> 24) & 0xFFU)
437#define PCIE_CONF_CLASSREV_SUBCLASS(w) (((w) >> 16) & 0xFFU)
438#define PCIE_CONF_CLASSREV_PROGIF(w) (((w) >> 8) & 0xFFU)
439#define PCIE_CONF_CLASSREV_REV(w) ((w) & 0xFFU)
440
441/*
442 * The only part of configuration word 3 that is of interest to us is
443 * the header type, as we use it to distinguish functional endpoints
444 * from bridges (which are, for our purposes, transparent).
445 */
446
447#define PCIE_CONF_TYPE 3U
448
449#define PCIE_CONF_MULTIFUNCTION(w) (((w) & 0x00800000U) != 0U)
450#define PCIE_CONF_TYPE_BRIDGE(w) (((w) & 0x007F0000U) != 0U)
451#define PCIE_CONF_TYPE_GET(w) (((w) >> 16) & 0x7F)
452
453#define PCIE_CONF_TYPE_STANDARD 0x0U
454#define PCIE_CONF_TYPE_PCI_BRIDGE 0x1U
455#define PCIE_CONF_TYPE_CARDBUS_BRIDGE 0x2U
456
457/*
458 * Words 4-9 are BARs are I/O or memory decoders. Memory decoders may
459 * be 64-bit decoders, in which case the next configuration word holds
460 * the high-order bits (and is, thus, not a BAR itself).
461 */
462
463#define PCIE_CONF_BAR0 4U
464#define PCIE_CONF_BAR1 5U
465#define PCIE_CONF_BAR2 6U
466#define PCIE_CONF_BAR3 7U
467#define PCIE_CONF_BAR4 8U
468#define PCIE_CONF_BAR5 9U
469
470#define PCIE_CONF_BAR_IO(w) (((w) & 0x00000001U) == 0x00000001U)
471#define PCIE_CONF_BAR_MEM(w) (((w) & 0x00000001U) != 0x00000001U)
472#define PCIE_CONF_BAR_64(w) (((w) & 0x00000006U) == 0x00000004U)
473#define PCIE_CONF_BAR_ADDR(w) ((w) & ~0xfUL)
474#define PCIE_CONF_BAR_IO_ADDR(w) ((w) & ~0x3UL)
475#define PCIE_CONF_BAR_FLAGS(w) ((w) & 0xfUL)
476#define PCIE_CONF_BAR_NONE 0U
477
478#define PCIE_CONF_BAR_INVAL 0xFFFFFFF0U
479#define PCIE_CONF_BAR_INVAL64 0xFFFFFFFFFFFFFFF0UL
480
481#define PCIE_CONF_BAR_INVAL_FLAGS(w) \
482 ((((w) & 0x00000006U) == 0x00000006U) || \
483 (((w) & 0x00000006U) == 0x00000002U))
484
485/*
486 * Type 1 Header has files related to bus management
487 */
488#define PCIE_BUS_NUMBER 6U
489
490#define PCIE_BUS_PRIMARY_NUMBER(w) ((w) & 0xffUL)
491#define PCIE_BUS_SECONDARY_NUMBER(w) (((w) >> 8) & 0xffUL)
492#define PCIE_BUS_SUBORDINATE_NUMBER(w) (((w) >> 16) & 0xffUL)
493#define PCIE_SECONDARY_LATENCY_TIMER(w) (((w) >> 24) & 0xffUL)
494
495#define PCIE_BUS_NUMBER_VAL(prim, sec, sub, lat) \
496 (((prim) & 0xffUL) | \
497 (((sec) & 0xffUL) << 8) | \
498 (((sub) & 0xffUL) << 16) | \
499 (((lat) & 0xffUL) << 24))
500
501/*
502 * Type 1 words 7 to 12 setups Bridge Memory base and limits
503 */
504#define PCIE_IO_SEC_STATUS 7U
505
506#define PCIE_IO_BASE(w) ((w) & 0xffUL)
507#define PCIE_IO_LIMIT(w) (((w) >> 8) & 0xffUL)
508#define PCIE_SEC_STATUS(w) (((w) >> 16) & 0xffffUL)
509
510#define PCIE_IO_SEC_STATUS_VAL(iob, iol, sec_status) \
511 (((iob) & 0xffUL) | \
512 (((iol) & 0xffUL) << 8) | \
513 (((sec_status) & 0xffffUL) << 16))
514
515#define PCIE_MEM_BASE_LIMIT 8U
516
517#define PCIE_MEM_BASE(w) ((w) & 0xffffUL)
518#define PCIE_MEM_LIMIT(w) (((w) >> 16) & 0xffffUL)
519
520#define PCIE_MEM_BASE_LIMIT_VAL(memb, meml) \
521 (((memb) & 0xffffUL) | \
522 (((meml) & 0xffffUL) << 16))
523
524#define PCIE_PREFETCH_BASE_LIMIT 9U
525
526#define PCIE_PREFETCH_BASE(w) ((w) & 0xffffUL)
527#define PCIE_PREFETCH_LIMIT(w) (((w) >> 16) & 0xffffUL)
528
529#define PCIE_PREFETCH_BASE_LIMIT_VAL(pmemb, pmeml) \
530 (((pmemb) & 0xffffUL) | \
531 (((pmeml) & 0xffffUL) << 16))
532
533#define PCIE_PREFETCH_BASE_UPPER 10U
534
535#define PCIE_PREFETCH_LIMIT_UPPER 11U
536
537#define PCIE_IO_BASE_LIMIT_UPPER 12U
538
539#define PCIE_IO_BASE_UPPER(w) ((w) & 0xffffUL)
540#define PCIE_IO_LIMIT_UPPER(w) (((w) >> 16) & 0xffffUL)
541
542#define PCIE_IO_BASE_LIMIT_UPPER_VAL(iobu, iolu) \
543 (((iobu) & 0xffffUL) | \
544 (((iolu) & 0xffffUL) << 16))
545
546/*
547 * Word 15 contains information related to interrupts.
548 *
549 * We're only interested in the low byte, which is [supposed to be] set by
550 * the firmware to indicate which wire IRQ the device interrupt is routed to.
551 */
552
553#define PCIE_CONF_INTR 15U
554
555#define PCIE_CONF_INTR_IRQ(w) ((w) & 0xFFU)
556#define PCIE_CONF_INTR_IRQ_NONE 0xFFU /* no interrupt routed */
557
558#define PCIE_MAX_BUS (0xFFFFFFFFU & PCIE_BDF_BUS_MASK)
559#define PCIE_MAX_DEV (0xFFFFFFFFU & PCIE_BDF_DEV_MASK)
560#define PCIE_MAX_FUNC (0xFFFFFFFFU & PCIE_BDF_FUNC_MASK)
561
576#define PCIE_IRQ_CONNECT(bdf_p, irq_p, priority_p, \
577 isr_p, isr_param_p, flags_p) \
578 ARCH_PCIE_IRQ_CONNECT(bdf_p, irq_p, priority_p, \
579 isr_p, isr_param_p, flags_p)
580
581#ifdef __cplusplus
582}
583#endif
584
588
589#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:51
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:195
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:42
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:199
@ PCIE_SCAN_CB_ALL
Do the callback for all endpoint types, including bridges.
Definition pcie.h:201
#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:156
uintptr_t phys_addr
Definition pcie.h:157
size_t size
Definition pcie.h:158
Definition pcie.h:63
pcie_id_t id
Definition pcie.h:65
uint32_t class_rev_mask
Definition pcie.h:67
pcie_bdf_t bdf
Definition pcie.h:64
uint32_t class_rev
Definition pcie.h:66
Options for performing a scan for PCI devices.
Definition pcie.h:205
uint8_t bus
Initial bus number to scan.
Definition pcie.h:207
void * cb_data
Custom data to pass to the scan callback.
Definition pcie.h:213
pcie_scan_cb_t cb
Function to call for each found endpoint.
Definition pcie.h:210
uint32_t flags
Scan flags.
Definition pcie.h:216