Lines Matching +full:spi +full:- +full:cs +full:- +full:hold +full:- +full:delay +full:- +full:ns
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 // SPI init/core code
9 #include <linux/clk/clk-conf.h>
10 #include <linux/delay.h>
13 #include <linux/dma-mapping.h>
34 #include <linux/spi/offload/types.h>
35 #include <linux/spi/spi.h>
36 #include <linux/spi/spi-mem.h>
40 #include <trace/events/spi.h>
50 struct spi_device *spi = to_spi_device(dev); in spidev_release() local
52 spi_controller_put(spi->controller); in spidev_release()
53 kfree(spi->driver_override); in spidev_release()
54 free_percpu(spi->pcpu_statistics); in spidev_release()
55 kfree(spi); in spidev_release()
61 const struct spi_device *spi = to_spi_device(dev); in modalias_show() local
64 len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1); in modalias_show()
65 if (len != -ENODEV) in modalias_show()
68 return sysfs_emit(buf, "%s%s\n", SPI_MODULE_PREFIX, spi->modalias); in modalias_show()
76 struct spi_device *spi = to_spi_device(dev); in driver_override_store() local
79 ret = driver_set_override(dev, &spi->driver_override, buf, count); in driver_override_store()
89 const struct spi_device *spi = to_spi_device(dev); in driver_override_show() local
93 len = sysfs_emit(buf, "%s\n", spi->driver_override ? : ""); in driver_override_show()
115 u64_stats_init(&stat->syncp); in spi_alloc_pcpu_stats()
136 start = u64_stats_fetch_begin(&pcpu_stats->syncp); in spi_emit_pcpu_stats()
138 } while (u64_stats_fetch_retry(&pcpu_stats->syncp, start)); in spi_emit_pcpu_stats()
151 return spi_statistics_##field##_show(ctlr->pcpu_statistics, buf); \
161 struct spi_device *spi = to_spi_device(dev); \
162 return spi_statistics_##field##_show(spi->pcpu_statistics, buf); \
199 SPI_STATISTICS_TRANSFER_BYTES_HISTO(0, "0-1");
200 SPI_STATISTICS_TRANSFER_BYTES_HISTO(1, "2-3");
201 SPI_STATISTICS_TRANSFER_BYTES_HISTO(2, "4-7");
202 SPI_STATISTICS_TRANSFER_BYTES_HISTO(3, "8-15");
203 SPI_STATISTICS_TRANSFER_BYTES_HISTO(4, "16-31");
204 SPI_STATISTICS_TRANSFER_BYTES_HISTO(5, "32-63");
205 SPI_STATISTICS_TRANSFER_BYTES_HISTO(6, "64-127");
206 SPI_STATISTICS_TRANSFER_BYTES_HISTO(7, "128-255");
207 SPI_STATISTICS_TRANSFER_BYTES_HISTO(8, "256-511");
208 SPI_STATISTICS_TRANSFER_BYTES_HISTO(9, "512-1023");
209 SPI_STATISTICS_TRANSFER_BYTES_HISTO(10, "1024-2047");
210 SPI_STATISTICS_TRANSFER_BYTES_HISTO(11, "2048-4095");
211 SPI_STATISTICS_TRANSFER_BYTES_HISTO(12, "4096-8191");
212 SPI_STATISTICS_TRANSFER_BYTES_HISTO(13, "8192-16383");
213 SPI_STATISTICS_TRANSFER_BYTES_HISTO(14, "16384-32767");
214 SPI_STATISTICS_TRANSFER_BYTES_HISTO(15, "32768-65535");
318 int l2len = min(fls(xfer->len), SPI_STATISTICS_HISTO_SIZE) - 1; in spi_statistics_add_transfer_stats()
326 u64_stats_update_begin(&stats->syncp); in spi_statistics_add_transfer_stats()
328 u64_stats_inc(&stats->transfers); in spi_statistics_add_transfer_stats()
329 u64_stats_inc(&stats->transfer_bytes_histo[l2len]); in spi_statistics_add_transfer_stats()
331 u64_stats_add(&stats->bytes, xfer->len); in spi_statistics_add_transfer_stats()
333 u64_stats_add(&stats->bytes_tx, xfer->len); in spi_statistics_add_transfer_stats()
335 u64_stats_add(&stats->bytes_rx, xfer->len); in spi_statistics_add_transfer_stats()
337 u64_stats_update_end(&stats->syncp); in spi_statistics_add_transfer_stats()
342 * modalias support makes "modprobe $MODALIAS" new-style hotplug work,
347 while (id->name[0]) { in spi_match_id()
348 if (!strcmp(name, id->name)) in spi_match_id()
357 const struct spi_driver *sdrv = to_spi_driver(sdev->dev.driver); in spi_get_device_id()
359 return spi_match_id(sdrv->id_table, sdev->modalias); in spi_get_device_id()
367 match = device_get_match_data(&sdev->dev); in spi_get_device_match_data()
371 return (const void *)spi_get_device_id(sdev)->driver_data; in spi_get_device_match_data()
377 const struct spi_device *spi = to_spi_device(dev); in spi_match_device() local
381 if (spi->driver_override) in spi_match_device()
382 return strcmp(spi->driver_override, drv->name) == 0; in spi_match_device()
392 if (sdrv->id_table) in spi_match_device()
393 return !!spi_match_id(sdrv->id_table, spi->modalias); in spi_match_device()
395 return strcmp(spi->modalias, drv->name) == 0; in spi_match_device()
400 const struct spi_device *spi = to_spi_device(dev); in spi_uevent() local
404 if (rc != -ENODEV) in spi_uevent()
407 return add_uevent_var(env, "MODALIAS=%s%s", SPI_MODULE_PREFIX, spi->modalias); in spi_uevent()
412 const struct spi_driver *sdrv = to_spi_driver(dev->driver); in spi_probe()
413 struct spi_device *spi = to_spi_device(dev); in spi_probe() local
417 ret = of_clk_set_defaults(dev->of_node, false); in spi_probe()
422 spi->irq = of_irq_get(dev->of_node, 0); in spi_probe()
423 else if (is_acpi_device_node(fwnode) && spi->irq < 0) in spi_probe()
424 spi->irq = acpi_dev_gpio_irq_get(to_acpi_device_node(fwnode), 0); in spi_probe()
425 if (spi->irq == -EPROBE_DEFER) in spi_probe()
426 return dev_err_probe(dev, spi->irq, "Failed to get irq\n"); in spi_probe()
427 if (spi->irq < 0) in spi_probe()
428 spi->irq = 0; in spi_probe()
434 if (sdrv->probe) { in spi_probe()
435 ret = sdrv->probe(spi); in spi_probe()
445 const struct spi_driver *sdrv = to_spi_driver(dev->driver); in spi_remove()
447 if (sdrv->remove) in spi_remove()
448 sdrv->remove(to_spi_device(dev)); in spi_remove()
455 if (dev->driver) { in spi_shutdown()
456 const struct spi_driver *sdrv = to_spi_driver(dev->driver); in spi_shutdown()
458 if (sdrv->shutdown) in spi_shutdown()
459 sdrv->shutdown(to_spi_device(dev)); in spi_shutdown()
464 .name = "spi",
475 * __spi_register_driver - register a SPI driver
484 sdrv->driver.owner = owner; in __spi_register_driver()
485 sdrv->driver.bus = &spi_bus_type; in __spi_register_driver()
488 * For Really Good Reasons we use spi: modaliases not of: in __spi_register_driver()
492 if (sdrv->driver.of_match_table) { in __spi_register_driver()
495 for (of_id = sdrv->driver.of_match_table; of_id->compatible[0]; in __spi_register_driver()
500 of_name = strnchr(of_id->compatible, in __spi_register_driver()
501 sizeof(of_id->compatible), ','); in __spi_register_driver()
505 of_name = of_id->compatible; in __spi_register_driver()
507 if (sdrv->id_table) { in __spi_register_driver()
510 spi_id = spi_match_id(sdrv->id_table, of_name); in __spi_register_driver()
514 if (strcmp(sdrv->driver.name, of_name) == 0) in __spi_register_driver()
518 pr_warn("SPI driver %s has no spi_device_id for %s\n", in __spi_register_driver()
519 sdrv->driver.name, of_id->compatible); in __spi_register_driver()
523 return driver_register(&sdrv->driver); in __spi_register_driver()
527 /*-------------------------------------------------------------------------*/
530 * SPI devices should normally not be created by SPI device drivers; that
531 * would make them board-specific. Similarly with SPI controller drivers.
532 * Device registration normally goes into like arch/.../mach.../board-YYY.c
552 * spi_alloc_device - Allocate a new SPI device
562 * spi_device structure to add it to the SPI controller. If the caller
570 struct spi_device *spi; in spi_alloc_device() local
575 spi = kzalloc(sizeof(*spi), GFP_KERNEL); in spi_alloc_device()
576 if (!spi) { in spi_alloc_device()
581 spi->pcpu_statistics = spi_alloc_pcpu_stats(NULL); in spi_alloc_device()
582 if (!spi->pcpu_statistics) { in spi_alloc_device()
583 kfree(spi); in spi_alloc_device()
588 spi->controller = ctlr; in spi_alloc_device()
589 spi->dev.parent = &ctlr->dev; in spi_alloc_device()
590 spi->dev.bus = &spi_bus_type; in spi_alloc_device()
591 spi->dev.release = spidev_release; in spi_alloc_device()
592 spi->mode = ctlr->buswidth_override_bits; in spi_alloc_device()
594 device_initialize(&spi->dev); in spi_alloc_device()
595 return spi; in spi_alloc_device()
599 static void spi_dev_set_name(struct spi_device *spi) in spi_dev_set_name() argument
601 struct device *dev = &spi->dev; in spi_dev_set_name()
605 dev_set_name(dev, "spi-%s", acpi_dev_name(to_acpi_device_node(fwnode))); in spi_dev_set_name()
610 dev_set_name(dev, "spi-%pfwP", fwnode); in spi_dev_set_name()
614 dev_set_name(&spi->dev, "%s.%u", dev_name(&spi->controller->dev), in spi_dev_set_name()
615 spi_get_chipselect(spi, 0)); in spi_dev_set_name()
619 * Zero(0) is a valid physical CS value and can be located at any
620 * logical CS in the spi->chip_select[]. If all the physical CS
622 * between a valid physical CS 0 & an unused logical CS whose physical
623 * CS can be 0. As a solution to this issue initialize all the CS to -1.
624 * Now all the unused logical CS will have -1 physical CS value & can be
625 * ignored while performing physical CS validity checks.
627 #define SPI_INVALID_CS ((s8)-1)
635 struct spi_device *spi, u8 idx, in spi_dev_check_cs() argument
638 u8 cs, cs_new; in spi_dev_check_cs() local
641 cs = spi_get_chipselect(spi, idx); in spi_dev_check_cs()
644 if (is_valid_cs(cs) && is_valid_cs(cs_new) && cs == cs_new) { in spi_dev_check_cs()
646 return -EBUSY; in spi_dev_check_cs()
654 struct spi_device *spi = to_spi_device(dev); in spi_dev_check() local
658 if (spi->controller == new_spi->controller) { in spi_dev_check()
660 status = spi_dev_check_cs(dev, spi, idx, new_spi, 0); in spi_dev_check()
668 static void spi_cleanup(struct spi_device *spi) in spi_cleanup() argument
670 if (spi->controller->cleanup) in spi_cleanup()
671 spi->controller->cleanup(spi); in spi_cleanup()
674 static int __spi_add_device(struct spi_device *spi) in __spi_add_device() argument
676 struct spi_controller *ctlr = spi->controller; in __spi_add_device()
677 struct device *dev = ctlr->dev.parent; in __spi_add_device()
679 u8 cs; in __spi_add_device() local
683 cs = spi_get_chipselect(spi, idx); in __spi_add_device()
684 if (is_valid_cs(cs) && cs >= ctlr->num_chipselect) { in __spi_add_device()
685 dev_err(dev, "cs%d >= max %d\n", spi_get_chipselect(spi, idx), in __spi_add_device()
686 ctlr->num_chipselect); in __spi_add_device()
687 return -EINVAL; in __spi_add_device()
692 * Make sure that multiple logical CS doesn't map to the same physical CS. in __spi_add_device()
693 * For example, spi->chip_select[0] != spi->chip_select[1] and so on. in __spi_add_device()
697 status = spi_dev_check_cs(dev, spi, idx, spi, idx + 1); in __spi_add_device()
704 spi_dev_set_name(spi); in __spi_add_device()
711 status = bus_for_each_dev(&spi_bus_type, NULL, spi, spi_dev_check); in __spi_add_device()
717 !device_is_registered(&ctlr->dev)) { in __spi_add_device()
718 return -ENODEV; in __spi_add_device()
721 if (ctlr->cs_gpiods) { in __spi_add_device()
722 u8 cs; in __spi_add_device() local
725 cs = spi_get_chipselect(spi, idx); in __spi_add_device()
726 if (is_valid_cs(cs)) in __spi_add_device()
727 spi_set_csgpiod(spi, idx, ctlr->cs_gpiods[cs]); in __spi_add_device()
736 status = spi_setup(spi); in __spi_add_device()
739 dev_name(&spi->dev), status); in __spi_add_device()
744 status = device_add(&spi->dev); in __spi_add_device()
747 dev_name(&spi->dev), status); in __spi_add_device()
748 spi_cleanup(spi); in __spi_add_device()
750 dev_dbg(dev, "registered child %s\n", dev_name(&spi->dev)); in __spi_add_device()
757 * spi_add_device - Add spi_device allocated with spi_alloc_device
758 * @spi: spi_device to register
761 * spi_alloc_device can be added onto the SPI bus with this function.
765 int spi_add_device(struct spi_device *spi) in spi_add_device() argument
767 struct spi_controller *ctlr = spi->controller; in spi_add_device()
771 spi_dev_set_name(spi); in spi_add_device()
773 mutex_lock(&ctlr->add_lock); in spi_add_device()
774 status = __spi_add_device(spi); in spi_add_device()
775 mutex_unlock(&ctlr->add_lock); in spi_add_device()
780 static void spi_set_all_cs_unused(struct spi_device *spi) in spi_set_all_cs_unused() argument
785 spi_set_chipselect(spi, idx, SPI_INVALID_CS); in spi_set_all_cs_unused()
789 * spi_new_device - instantiate one new SPI device
791 * @chip: Describes the SPI device
795 * after board init creates the hard-wired devices. Some development
798 * driver could add devices (which it would learn about out-of-band).
809 * NOTE: caller did any chip->bus_num checks necessary. in spi_new_device()
812 * error-or-pointer (not NULL-or-pointer), troubleshootability in spi_new_device()
820 WARN_ON(strlen(chip->modalias) >= sizeof(proxy->modalias)); in spi_new_device()
822 /* Use provided chip-select for proxy device */ in spi_new_device()
824 spi_set_chipselect(proxy, 0, chip->chip_select); in spi_new_device()
826 proxy->max_speed_hz = chip->max_speed_hz; in spi_new_device()
827 proxy->mode = chip->mode; in spi_new_device()
828 proxy->irq = chip->irq; in spi_new_device()
829 strscpy(proxy->modalias, chip->modalias, sizeof(proxy->modalias)); in spi_new_device()
830 proxy->dev.platform_data = (void *) chip->platform_data; in spi_new_device()
831 proxy->controller_data = chip->controller_data; in spi_new_device()
832 proxy->controller_state = NULL; in spi_new_device()
834 * By default spi->chip_select[0] will hold the physical CS number, in spi_new_device()
835 * so set bit 0 in spi->cs_index_mask. in spi_new_device()
837 proxy->cs_index_mask = BIT(0); in spi_new_device()
839 if (chip->swnode) { in spi_new_device()
840 status = device_add_software_node(&proxy->dev, chip->swnode); in spi_new_device()
842 dev_err(&ctlr->dev, "failed to add software node to '%s': %d\n", in spi_new_device()
843 chip->modalias, status); in spi_new_device()
855 device_remove_software_node(&proxy->dev); in spi_new_device()
862 * spi_unregister_device - unregister a single SPI device
863 * @spi: spi_device to unregister
865 * Start making the passed SPI device vanish. Normally this would be handled
868 void spi_unregister_device(struct spi_device *spi) in spi_unregister_device() argument
872 if (!spi) in spi_unregister_device()
875 fwnode = dev_fwnode(&spi->dev); in spi_unregister_device()
882 device_remove_software_node(&spi->dev); in spi_unregister_device()
883 device_del(&spi->dev); in spi_unregister_device()
884 spi_cleanup(spi); in spi_unregister_device()
885 put_device(&spi->dev); in spi_unregister_device()
894 if (ctlr->bus_num != bi->bus_num) in spi_match_controller_to_boardinfo()
899 dev_err(ctlr->dev.parent, "can't create new device for %s\n", in spi_match_controller_to_boardinfo()
900 bi->modalias); in spi_match_controller_to_boardinfo()
904 * spi_register_board_info - register SPI devices for a given board
909 * Board-specific early init code calls this (probably during arch_initcall)
910 * with segments of the SPI device table. Any device nodes are created later,
911 * after the relevant parent SPI controller (bus_num) is defined. We keep
913 * not make Linux forget about these hard-wired devices.
915 * Other code can also call this, e.g. a particular add-on board might provide
916 * SPI devices through its expansion connector, so code initializing that board
917 * would naturally declare its SPI devices.
920 * any embedded pointers (platform_data, etc), they're copied as-is.
934 return -ENOMEM; in spi_register_board_info()
939 memcpy(&bi->board_info, info, sizeof(*info)); in spi_register_board_info()
942 list_add_tail(&bi->list, &board_list); in spi_register_board_info()
945 &bi->board_info); in spi_register_board_info()
952 /*-------------------------------------------------------------------------*/
954 /* Core methods for SPI resource management */
957 * spi_res_alloc - allocate a spi resource that is life-cycle managed
960 * @spi: the SPI device for which we allocate memory
970 static void *spi_res_alloc(struct spi_device *spi, spi_res_release_t release, in spi_res_alloc() argument
979 INIT_LIST_HEAD(&sres->entry); in spi_res_alloc()
980 sres->release = release; in spi_res_alloc()
982 return sres->data; in spi_res_alloc()
986 * spi_res_free - free an SPI resource
993 WARN_ON(!list_empty(&sres->entry)); in spi_res_free()
998 * spi_res_add - add a spi_res to the spi_message
999 * @message: the SPI message
1006 WARN_ON(!list_empty(&sres->entry)); in spi_res_add()
1007 list_add_tail(&sres->entry, &message->resources); in spi_res_add()
1011 * spi_res_release - release all SPI resources for this message
1019 list_for_each_entry_safe_reverse(res, tmp, &message->resources, entry) { in spi_res_release()
1020 if (res->release) in spi_res_release()
1021 res->release(ctlr, message, res->data); in spi_res_release()
1023 list_del(&res->entry); in spi_res_release()
1029 /*-------------------------------------------------------------------------*/
1030 #define spi_for_each_valid_cs(spi, idx) \ argument
1032 if (!(spi->cs_index_mask & BIT(idx))) {} else
1034 static inline bool spi_is_last_cs(struct spi_device *spi) in spi_is_last_cs() argument
1039 spi_for_each_valid_cs(spi, idx) { in spi_is_last_cs()
1040 if (spi->controller->last_cs[idx] == spi_get_chipselect(spi, idx)) in spi_is_last_cs()
1046 static void spi_toggle_csgpiod(struct spi_device *spi, u8 idx, bool enable, bool activate) in spi_toggle_csgpiod() argument
1050 * thus the SPISerialBus() resource defines it on the per-chip in spi_toggle_csgpiod()
1054 * the GPIO CS polarity must be defined Active High to avoid in spi_toggle_csgpiod()
1058 if (is_acpi_device_node(dev_fwnode(&spi->dev))) in spi_toggle_csgpiod()
1059 gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx), !enable); in spi_toggle_csgpiod()
1062 gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx), activate); in spi_toggle_csgpiod()
1065 spi_delay_exec(&spi->cs_setup, NULL); in spi_toggle_csgpiod()
1067 spi_delay_exec(&spi->cs_inactive, NULL); in spi_toggle_csgpiod()
1070 static void spi_set_cs(struct spi_device *spi, bool enable, bool force) in spi_set_cs() argument
1079 if (!force && (enable == spi_is_last_cs(spi)) && in spi_set_cs()
1080 (spi->controller->last_cs_index_mask == spi->cs_index_mask) && in spi_set_cs()
1081 (spi->controller->last_cs_mode_high == (spi->mode & SPI_CS_HIGH))) in spi_set_cs()
1084 trace_spi_set_cs(spi, activate); in spi_set_cs()
1086 spi->controller->last_cs_index_mask = spi->cs_index_mask; in spi_set_cs()
1088 spi->controller->last_cs[idx] = enable ? spi_get_chipselect(spi, 0) : SPI_INVALID_CS; in spi_set_cs()
1090 spi->controller->last_cs_mode_high = spi->mode & SPI_CS_HIGH; in spi_set_cs()
1091 if (spi->controller->last_cs_mode_high) in spi_set_cs()
1095 * Handle chip select delays for GPIO based CS or controllers without in spi_set_cs()
1098 if ((spi_is_csgpiod(spi) || !spi->controller->set_cs_timing) && !activate) in spi_set_cs()
1099 spi_delay_exec(&spi->cs_hold, NULL); in spi_set_cs()
1101 if (spi_is_csgpiod(spi)) { in spi_set_cs()
1102 if (!(spi->mode & SPI_NO_CS)) { in spi_set_cs()
1103 spi_for_each_valid_cs(spi, idx) { in spi_set_cs()
1104 if (spi_get_csgpiod(spi, idx)) in spi_set_cs()
1105 spi_toggle_csgpiod(spi, idx, enable, activate); in spi_set_cs()
1108 /* Some SPI controllers need both GPIO CS & ->set_cs() */ in spi_set_cs()
1109 if ((spi->controller->flags & SPI_CONTROLLER_GPIO_SS) && in spi_set_cs()
1110 spi->controller->set_cs) in spi_set_cs()
1111 spi->controller->set_cs(spi, !enable); in spi_set_cs()
1112 } else if (spi->controller->set_cs) { in spi_set_cs()
1113 spi->controller->set_cs(spi, !enable); in spi_set_cs()
1116 if (spi_is_csgpiod(spi) || !spi->controller->set_cs_timing) { in spi_set_cs()
1118 spi_delay_exec(&spi->cs_setup, NULL); in spi_set_cs()
1120 spi_delay_exec(&spi->cs_inactive, NULL); in spi_set_cs()
1150 desc_len = min_t(size_t, max_seg_size, ctlr->max_dma_len); in spi_map_buf_attrs()
1153 return -EINVAL; in spi_map_buf_attrs()
1160 sg = &sgt->sgl[0]; in spi_map_buf_attrs()
1171 PAGE_SIZE - offset_in_page(buf))); in spi_map_buf_attrs()
1178 return -ENOMEM; in spi_map_buf_attrs()
1189 len -= min; in spi_map_buf_attrs()
1216 sgt->orig_nents = 0; in spi_unmap_buf_attrs()
1217 sgt->nents = 0; in spi_unmap_buf_attrs()
1232 if (!ctlr->can_dma) in __spi_map_msg()
1235 if (ctlr->dma_tx) in __spi_map_msg()
1236 tx_dev = ctlr->dma_tx->device->dev; in __spi_map_msg()
1237 else if (ctlr->dma_map_dev) in __spi_map_msg()
1238 tx_dev = ctlr->dma_map_dev; in __spi_map_msg()
1240 tx_dev = ctlr->dev.parent; in __spi_map_msg()
1242 if (ctlr->dma_rx) in __spi_map_msg()
1243 rx_dev = ctlr->dma_rx->device->dev; in __spi_map_msg()
1244 else if (ctlr->dma_map_dev) in __spi_map_msg()
1245 rx_dev = ctlr->dma_map_dev; in __spi_map_msg()
1247 rx_dev = ctlr->dev.parent; in __spi_map_msg()
1249 ret = -ENOMSG; in __spi_map_msg()
1250 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_map_msg()
1254 if (!ctlr->can_dma(ctlr, msg->spi, xfer)) in __spi_map_msg()
1257 if (xfer->tx_buf != NULL) { in __spi_map_msg()
1258 ret = spi_map_buf_attrs(ctlr, tx_dev, &xfer->tx_sg, in __spi_map_msg()
1259 (void *)xfer->tx_buf, in __spi_map_msg()
1260 xfer->len, DMA_TO_DEVICE, in __spi_map_msg()
1265 xfer->tx_sg_mapped = true; in __spi_map_msg()
1268 if (xfer->rx_buf != NULL) { in __spi_map_msg()
1269 ret = spi_map_buf_attrs(ctlr, rx_dev, &xfer->rx_sg, in __spi_map_msg()
1270 xfer->rx_buf, xfer->len, in __spi_map_msg()
1274 &xfer->tx_sg, DMA_TO_DEVICE, in __spi_map_msg()
1280 xfer->rx_sg_mapped = true; in __spi_map_msg()
1287 ctlr->cur_rx_dma_dev = rx_dev; in __spi_map_msg()
1288 ctlr->cur_tx_dma_dev = tx_dev; in __spi_map_msg()
1295 struct device *rx_dev = ctlr->cur_rx_dma_dev; in __spi_unmap_msg()
1296 struct device *tx_dev = ctlr->cur_tx_dma_dev; in __spi_unmap_msg()
1299 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_unmap_msg()
1303 if (xfer->rx_sg_mapped) in __spi_unmap_msg()
1304 spi_unmap_buf_attrs(ctlr, rx_dev, &xfer->rx_sg, in __spi_unmap_msg()
1306 xfer->rx_sg_mapped = false; in __spi_unmap_msg()
1308 if (xfer->tx_sg_mapped) in __spi_unmap_msg()
1309 spi_unmap_buf_attrs(ctlr, tx_dev, &xfer->tx_sg, in __spi_unmap_msg()
1311 xfer->tx_sg_mapped = false; in __spi_unmap_msg()
1320 struct device *rx_dev = ctlr->cur_rx_dma_dev; in spi_dma_sync_for_device()
1321 struct device *tx_dev = ctlr->cur_tx_dma_dev; in spi_dma_sync_for_device()
1323 if (xfer->tx_sg_mapped) in spi_dma_sync_for_device()
1324 dma_sync_sgtable_for_device(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE); in spi_dma_sync_for_device()
1325 if (xfer->rx_sg_mapped) in spi_dma_sync_for_device()
1326 dma_sync_sgtable_for_device(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE); in spi_dma_sync_for_device()
1332 struct device *rx_dev = ctlr->cur_rx_dma_dev; in spi_dma_sync_for_cpu()
1333 struct device *tx_dev = ctlr->cur_tx_dma_dev; in spi_dma_sync_for_cpu()
1335 if (xfer->rx_sg_mapped) in spi_dma_sync_for_cpu()
1336 dma_sync_sgtable_for_cpu(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE); in spi_dma_sync_for_cpu()
1337 if (xfer->tx_sg_mapped) in spi_dma_sync_for_cpu()
1338 dma_sync_sgtable_for_cpu(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE); in spi_dma_sync_for_cpu()
1369 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_unmap_msg()
1374 if (xfer->tx_buf == ctlr->dummy_tx) in spi_unmap_msg()
1375 xfer->tx_buf = NULL; in spi_unmap_msg()
1376 if (xfer->rx_buf == ctlr->dummy_rx) in spi_unmap_msg()
1377 xfer->rx_buf = NULL; in spi_unmap_msg()
1389 if ((ctlr->flags & (SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX)) in spi_map_msg()
1390 && !(msg->spi->mode & SPI_3WIRE)) { in spi_map_msg()
1394 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_map_msg()
1395 if ((ctlr->flags & SPI_CONTROLLER_MUST_TX) && in spi_map_msg()
1396 !xfer->tx_buf) in spi_map_msg()
1397 max_tx = max(xfer->len, max_tx); in spi_map_msg()
1398 if ((ctlr->flags & SPI_CONTROLLER_MUST_RX) && in spi_map_msg()
1399 !xfer->rx_buf) in spi_map_msg()
1400 max_rx = max(xfer->len, max_rx); in spi_map_msg()
1404 tmp = krealloc(ctlr->dummy_tx, max_tx, in spi_map_msg()
1407 return -ENOMEM; in spi_map_msg()
1408 ctlr->dummy_tx = tmp; in spi_map_msg()
1412 tmp = krealloc(ctlr->dummy_rx, max_rx, in spi_map_msg()
1415 return -ENOMEM; in spi_map_msg()
1416 ctlr->dummy_rx = tmp; in spi_map_msg()
1420 list_for_each_entry(xfer, &msg->transfers, in spi_map_msg()
1422 if (!xfer->len) in spi_map_msg()
1424 if (!xfer->tx_buf) in spi_map_msg()
1425 xfer->tx_buf = ctlr->dummy_tx; in spi_map_msg()
1426 if (!xfer->rx_buf) in spi_map_msg()
1427 xfer->rx_buf = ctlr->dummy_rx; in spi_map_msg()
1439 struct spi_statistics __percpu *statm = ctlr->pcpu_statistics; in spi_transfer_wait()
1440 struct spi_statistics __percpu *stats = msg->spi->pcpu_statistics; in spi_transfer_wait()
1441 u32 speed_hz = xfer->speed_hz; in spi_transfer_wait()
1445 if (wait_for_completion_interruptible(&ctlr->xfer_completion)) { in spi_transfer_wait()
1446 dev_dbg(&msg->spi->dev, "SPI transfer interrupted\n"); in spi_transfer_wait()
1447 return -EINTR; in spi_transfer_wait()
1454 * For each byte we wait for 8 cycles of the SPI clock. in spi_transfer_wait()
1459 ms = 8LL * MSEC_PER_SEC * xfer->len; in spi_transfer_wait()
1470 ms = wait_for_completion_timeout(&ctlr->xfer_completion, in spi_transfer_wait()
1476 dev_err(&msg->spi->dev, in spi_transfer_wait()
1477 "SPI transfer timed out\n"); in spi_transfer_wait()
1478 return -ETIMEDOUT; in spi_transfer_wait()
1481 if (xfer->error & SPI_TRANS_FAIL_IO) in spi_transfer_wait()
1482 return -EIO; in spi_transfer_wait()
1488 static void _spi_transfer_delay_ns(u32 ns) in _spi_transfer_delay_ns() argument
1490 if (!ns) in _spi_transfer_delay_ns()
1492 if (ns <= NSEC_PER_USEC) { in _spi_transfer_delay_ns()
1493 ndelay(ns); in _spi_transfer_delay_ns()
1495 u32 us = DIV_ROUND_UP(ns, NSEC_PER_USEC); in _spi_transfer_delay_ns()
1503 u32 delay = _delay->value; in spi_delay_to_ns() local
1504 u32 unit = _delay->unit; in spi_delay_to_ns()
1507 if (!delay) in spi_delay_to_ns()
1512 delay *= NSEC_PER_USEC; in spi_delay_to_ns()
1520 return -EINVAL; in spi_delay_to_ns()
1525 hz = xfer->effective_speed_hz ?: xfer->speed_hz / 2; in spi_delay_to_ns()
1527 return -EINVAL; in spi_delay_to_ns()
1529 /* Convert delay to nanoseconds */ in spi_delay_to_ns()
1530 delay *= DIV_ROUND_UP(NSEC_PER_SEC, hz); in spi_delay_to_ns()
1533 return -EINVAL; in spi_delay_to_ns()
1536 return delay; in spi_delay_to_ns()
1542 int delay; in spi_delay_exec() local
1547 return -EINVAL; in spi_delay_exec()
1549 delay = spi_delay_to_ns(_delay, xfer); in spi_delay_exec()
1550 if (delay < 0) in spi_delay_exec()
1551 return delay; in spi_delay_exec()
1553 _spi_transfer_delay_ns(delay); in spi_delay_exec()
1563 u32 delay = xfer->cs_change_delay.value; in _spi_transfer_cs_change_delay() local
1564 u32 unit = xfer->cs_change_delay.unit; in _spi_transfer_cs_change_delay()
1567 /* Return early on "fast" mode - for everything but USECS */ in _spi_transfer_cs_change_delay()
1568 if (!delay) { in _spi_transfer_cs_change_delay()
1574 ret = spi_delay_exec(&xfer->cs_change_delay, xfer); in _spi_transfer_cs_change_delay()
1576 dev_err_once(&msg->spi->dev, in _spi_transfer_cs_change_delay()
1577 "Use of unsupported delay unit %i, using default of %luus\n", in _spi_transfer_cs_change_delay()
1591 * spi_transfer_one_message - Default implementation of transfer_one_message()
1603 struct spi_statistics __percpu *statm = ctlr->pcpu_statistics; in spi_transfer_one_message()
1604 struct spi_statistics __percpu *stats = msg->spi->pcpu_statistics; in spi_transfer_one_message()
1606 xfer = list_first_entry(&msg->transfers, struct spi_transfer, transfer_list); in spi_transfer_one_message()
1607 spi_set_cs(msg->spi, !xfer->cs_off, false); in spi_transfer_one_message()
1612 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_transfer_one_message()
1618 if (!ctlr->ptp_sts_supported) { in spi_transfer_one_message()
1619 xfer->ptp_sts_word_pre = 0; in spi_transfer_one_message()
1620 ptp_read_system_prets(xfer->ptp_sts); in spi_transfer_one_message()
1623 if ((xfer->tx_buf || xfer->rx_buf) && xfer->len) { in spi_transfer_one_message()
1624 reinit_completion(&ctlr->xfer_completion); in spi_transfer_one_message()
1628 ret = ctlr->transfer_one(ctlr, msg->spi, xfer); in spi_transfer_one_message()
1632 if ((xfer->tx_sg_mapped || xfer->rx_sg_mapped) && in spi_transfer_one_message()
1633 (xfer->error & SPI_TRANS_FAIL_NO_START)) { in spi_transfer_one_message()
1635 ctlr->fallback = true; in spi_transfer_one_message()
1636 xfer->error &= ~SPI_TRANS_FAIL_NO_START; in spi_transfer_one_message()
1644 dev_err(&msg->spi->dev, in spi_transfer_one_message()
1645 "SPI transfer failed: %d\n", ret); in spi_transfer_one_message()
1652 msg->status = ret; in spi_transfer_one_message()
1657 if (xfer->len) in spi_transfer_one_message()
1658 dev_err(&msg->spi->dev, in spi_transfer_one_message()
1660 xfer->len); in spi_transfer_one_message()
1663 if (!ctlr->ptp_sts_supported) { in spi_transfer_one_message()
1664 ptp_read_system_postts(xfer->ptp_sts); in spi_transfer_one_message()
1665 xfer->ptp_sts_word_post = xfer->len; in spi_transfer_one_message()
1670 if (msg->status != -EINPROGRESS) in spi_transfer_one_message()
1675 if (xfer->cs_change) { in spi_transfer_one_message()
1676 if (list_is_last(&xfer->transfer_list, in spi_transfer_one_message()
1677 &msg->transfers)) { in spi_transfer_one_message()
1680 if (!xfer->cs_off) in spi_transfer_one_message()
1681 spi_set_cs(msg->spi, false, false); in spi_transfer_one_message()
1683 if (!list_next_entry(xfer, transfer_list)->cs_off) in spi_transfer_one_message()
1684 spi_set_cs(msg->spi, true, false); in spi_transfer_one_message()
1686 } else if (!list_is_last(&xfer->transfer_list, &msg->transfers) && in spi_transfer_one_message()
1687 xfer->cs_off != list_next_entry(xfer, transfer_list)->cs_off) { in spi_transfer_one_message()
1688 spi_set_cs(msg->spi, xfer->cs_off, false); in spi_transfer_one_message()
1691 msg->actual_length += xfer->len; in spi_transfer_one_message()
1696 spi_set_cs(msg->spi, false, false); in spi_transfer_one_message()
1698 if (msg->status == -EINPROGRESS) in spi_transfer_one_message()
1699 msg->status = ret; in spi_transfer_one_message()
1701 if (msg->status && ctlr->handle_err) in spi_transfer_one_message()
1702 ctlr->handle_err(ctlr, msg); in spi_transfer_one_message()
1710 * spi_finalize_current_transfer - report completion of a transfer
1713 * Called by SPI drivers using the core transfer_one_message()
1719 complete(&ctlr->xfer_completion); in spi_finalize_current_transfer()
1725 if (ctlr->auto_runtime_pm) { in spi_idle_runtime_pm()
1726 pm_runtime_mark_last_busy(ctlr->dev.parent); in spi_idle_runtime_pm()
1727 pm_runtime_put_autosuspend(ctlr->dev.parent); in spi_idle_runtime_pm()
1737 if (!was_busy && ctlr->auto_runtime_pm) { in __spi_pump_transfer_message()
1738 ret = pm_runtime_get_sync(ctlr->dev.parent); in __spi_pump_transfer_message()
1740 pm_runtime_put_noidle(ctlr->dev.parent); in __spi_pump_transfer_message()
1741 dev_err(&ctlr->dev, "Failed to power device: %d\n", in __spi_pump_transfer_message()
1744 msg->status = ret; in __spi_pump_transfer_message()
1754 if (!was_busy && ctlr->prepare_transfer_hardware) { in __spi_pump_transfer_message()
1755 ret = ctlr->prepare_transfer_hardware(ctlr); in __spi_pump_transfer_message()
1757 dev_err(&ctlr->dev, in __spi_pump_transfer_message()
1761 if (ctlr->auto_runtime_pm) in __spi_pump_transfer_message()
1762 pm_runtime_put(ctlr->dev.parent); in __spi_pump_transfer_message()
1764 msg->status = ret; in __spi_pump_transfer_message()
1773 if (ctlr->prepare_message) { in __spi_pump_transfer_message()
1774 ret = ctlr->prepare_message(ctlr, msg); in __spi_pump_transfer_message()
1776 dev_err(&ctlr->dev, "failed to prepare message: %d\n", in __spi_pump_transfer_message()
1778 msg->status = ret; in __spi_pump_transfer_message()
1782 msg->prepared = true; in __spi_pump_transfer_message()
1787 msg->status = ret; in __spi_pump_transfer_message()
1792 if (!ctlr->ptp_sts_supported && !ctlr->transfer_one) { in __spi_pump_transfer_message()
1793 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_pump_transfer_message()
1794 xfer->ptp_sts_word_pre = 0; in __spi_pump_transfer_message()
1795 ptp_read_system_prets(xfer->ptp_sts); in __spi_pump_transfer_message()
1805 * ctlr->cur_msg. in __spi_pump_transfer_message()
1812 WRITE_ONCE(ctlr->cur_msg_incomplete, true); in __spi_pump_transfer_message()
1813 WRITE_ONCE(ctlr->cur_msg_need_completion, false); in __spi_pump_transfer_message()
1814 reinit_completion(&ctlr->cur_msg_completion); in __spi_pump_transfer_message()
1817 ret = ctlr->transfer_one_message(ctlr, msg); in __spi_pump_transfer_message()
1819 dev_err(&ctlr->dev, in __spi_pump_transfer_message()
1824 WRITE_ONCE(ctlr->cur_msg_need_completion, true); in __spi_pump_transfer_message()
1826 if (READ_ONCE(ctlr->cur_msg_incomplete)) in __spi_pump_transfer_message()
1827 wait_for_completion(&ctlr->cur_msg_completion); in __spi_pump_transfer_message()
1833 * __spi_pump_messages - function which processes SPI message queue
1837 * This function checks if there is any SPI message in the queue that
1853 mutex_lock(&ctlr->io_mutex); in __spi_pump_messages()
1856 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_pump_messages()
1859 if (ctlr->cur_msg) in __spi_pump_messages()
1863 if (list_empty(&ctlr->queue) || !ctlr->running) { in __spi_pump_messages()
1864 if (!ctlr->busy) in __spi_pump_messages()
1867 /* Defer any non-atomic teardown to the thread */ in __spi_pump_messages()
1869 if (!ctlr->dummy_rx && !ctlr->dummy_tx && in __spi_pump_messages()
1870 !ctlr->unprepare_transfer_hardware) { in __spi_pump_messages()
1872 ctlr->busy = false; in __spi_pump_messages()
1873 ctlr->queue_empty = true; in __spi_pump_messages()
1876 kthread_queue_work(ctlr->kworker, in __spi_pump_messages()
1877 &ctlr->pump_messages); in __spi_pump_messages()
1882 ctlr->busy = false; in __spi_pump_messages()
1883 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1885 kfree(ctlr->dummy_rx); in __spi_pump_messages()
1886 ctlr->dummy_rx = NULL; in __spi_pump_messages()
1887 kfree(ctlr->dummy_tx); in __spi_pump_messages()
1888 ctlr->dummy_tx = NULL; in __spi_pump_messages()
1889 if (ctlr->unprepare_transfer_hardware && in __spi_pump_messages()
1890 ctlr->unprepare_transfer_hardware(ctlr)) in __spi_pump_messages()
1891 dev_err(&ctlr->dev, in __spi_pump_messages()
1896 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_pump_messages()
1897 ctlr->queue_empty = true; in __spi_pump_messages()
1902 msg = list_first_entry(&ctlr->queue, struct spi_message, queue); in __spi_pump_messages()
1903 ctlr->cur_msg = msg; in __spi_pump_messages()
1905 list_del_init(&msg->queue); in __spi_pump_messages()
1906 if (ctlr->busy) in __spi_pump_messages()
1909 ctlr->busy = true; in __spi_pump_messages()
1910 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1913 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in __spi_pump_messages()
1915 ctlr->cur_msg = NULL; in __spi_pump_messages()
1916 ctlr->fallback = false; in __spi_pump_messages()
1918 mutex_unlock(&ctlr->io_mutex); in __spi_pump_messages()
1926 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1927 mutex_unlock(&ctlr->io_mutex); in __spi_pump_messages()
1931 * spi_pump_messages - kthread work function which processes spi message queue
1943 * spi_take_timestamp_pre - helper to collect the beginning of the TX timestamp
1955 * for the requested byte from the SPI transfer. The frequency with which this
1966 if (!xfer->ptp_sts) in spi_take_timestamp_pre()
1969 if (xfer->timestamped) in spi_take_timestamp_pre()
1972 if (progress > xfer->ptp_sts_word_pre) in spi_take_timestamp_pre()
1976 xfer->ptp_sts_word_pre = progress; in spi_take_timestamp_pre()
1979 local_irq_save(ctlr->irq_flags); in spi_take_timestamp_pre()
1983 ptp_read_system_prets(xfer->ptp_sts); in spi_take_timestamp_pre()
1988 * spi_take_timestamp_post - helper to collect the end of the TX timestamp
1992 * @irqs_off: If true, will re-enable IRQs and preemption for the local CPU.
1995 * the requested byte from the SPI transfer. Can be called with an arbitrary
2003 if (!xfer->ptp_sts) in spi_take_timestamp_post()
2006 if (xfer->timestamped) in spi_take_timestamp_post()
2009 if (progress < xfer->ptp_sts_word_post) in spi_take_timestamp_post()
2012 ptp_read_system_postts(xfer->ptp_sts); in spi_take_timestamp_post()
2015 local_irq_restore(ctlr->irq_flags); in spi_take_timestamp_post()
2020 xfer->ptp_sts_word_post = progress; in spi_take_timestamp_post()
2022 xfer->timestamped = 1; in spi_take_timestamp_post()
2027 * spi_set_thread_rt - set the controller to pump at realtime priority
2031 * (by setting the ->rt value before calling spi_register_controller()) or
2043 dev_info(&ctlr->dev, in spi_set_thread_rt()
2045 sched_set_fifo(ctlr->kworker->task); in spi_set_thread_rt()
2050 ctlr->running = false; in spi_init_queue()
2051 ctlr->busy = false; in spi_init_queue()
2052 ctlr->queue_empty = true; in spi_init_queue()
2054 ctlr->kworker = kthread_run_worker(0, dev_name(&ctlr->dev)); in spi_init_queue()
2055 if (IS_ERR(ctlr->kworker)) { in spi_init_queue()
2056 dev_err(&ctlr->dev, "failed to create message pump kworker\n"); in spi_init_queue()
2057 return PTR_ERR(ctlr->kworker); in spi_init_queue()
2060 kthread_init_work(&ctlr->pump_messages, spi_pump_messages); in spi_init_queue()
2065 * latency on the bus by minimising the delay between a transfer in spi_init_queue()
2069 if (ctlr->rt) in spi_init_queue()
2076 * spi_get_next_queued_message() - called by driver to check for queued
2091 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_get_next_queued_message()
2092 next = list_first_entry_or_null(&ctlr->queue, struct spi_message, in spi_get_next_queued_message()
2094 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_get_next_queued_message()
2101 * __spi_unoptimize_message - shared implementation of spi_unoptimize_message()
2113 struct spi_controller *ctlr = msg->spi->controller; in __spi_unoptimize_message()
2115 if (ctlr->unoptimize_message) in __spi_unoptimize_message()
2116 ctlr->unoptimize_message(msg); in __spi_unoptimize_message()
2120 msg->optimized = false; in __spi_unoptimize_message()
2121 msg->opt_state = NULL; in __spi_unoptimize_message()
2125 * spi_maybe_unoptimize_message - unoptimize msg not managed by a peripheral
2133 if (!msg->pre_optimized && msg->optimized && in spi_maybe_unoptimize_message()
2134 !msg->spi->controller->defer_optimize_message) in spi_maybe_unoptimize_message()
2139 * spi_finalize_current_message() - the current message is complete
2151 mesg = ctlr->cur_msg; in spi_finalize_current_message()
2153 if (!ctlr->ptp_sts_supported && !ctlr->transfer_one) { in spi_finalize_current_message()
2154 list_for_each_entry(xfer, &mesg->transfers, transfer_list) { in spi_finalize_current_message()
2155 ptp_read_system_postts(xfer->ptp_sts); in spi_finalize_current_message()
2156 xfer->ptp_sts_word_post = xfer->len; in spi_finalize_current_message()
2160 if (unlikely(ctlr->ptp_sts_supported)) in spi_finalize_current_message()
2161 list_for_each_entry(xfer, &mesg->transfers, transfer_list) in spi_finalize_current_message()
2162 WARN_ON_ONCE(xfer->ptp_sts && !xfer->timestamped); in spi_finalize_current_message()
2166 if (mesg->prepared && ctlr->unprepare_message) { in spi_finalize_current_message()
2167 ret = ctlr->unprepare_message(ctlr, mesg); in spi_finalize_current_message()
2169 dev_err(&ctlr->dev, "failed to unprepare message: %d\n", in spi_finalize_current_message()
2174 mesg->prepared = false; in spi_finalize_current_message()
2178 WRITE_ONCE(ctlr->cur_msg_incomplete, false); in spi_finalize_current_message()
2180 if (READ_ONCE(ctlr->cur_msg_need_completion)) in spi_finalize_current_message()
2181 complete(&ctlr->cur_msg_completion); in spi_finalize_current_message()
2185 mesg->state = NULL; in spi_finalize_current_message()
2186 if (mesg->complete) in spi_finalize_current_message()
2187 mesg->complete(mesg->context); in spi_finalize_current_message()
2195 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_start_queue()
2197 if (ctlr->running || ctlr->busy) { in spi_start_queue()
2198 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_start_queue()
2199 return -EBUSY; in spi_start_queue()
2202 ctlr->running = true; in spi_start_queue()
2203 ctlr->cur_msg = NULL; in spi_start_queue()
2204 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_start_queue()
2206 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in spi_start_queue()
2218 * A wait_queue on the ctlr->busy could be used, but then the common in spi_stop_queue()
2220 * friends on every SPI message. Do this instead. in spi_stop_queue()
2223 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_stop_queue()
2224 if (list_empty(&ctlr->queue) && !ctlr->busy) { in spi_stop_queue()
2225 ctlr->running = false; in spi_stop_queue()
2226 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_stop_queue()
2229 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_stop_queue()
2231 } while (--limit); in spi_stop_queue()
2233 return -EBUSY; in spi_stop_queue()
2249 dev_err(&ctlr->dev, "problem destroying queue\n"); in spi_destroy_queue()
2253 kthread_destroy_worker(ctlr->kworker); in spi_destroy_queue()
2258 static int __spi_queued_transfer(struct spi_device *spi, in __spi_queued_transfer() argument
2262 struct spi_controller *ctlr = spi->controller; in __spi_queued_transfer()
2265 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2267 if (!ctlr->running) { in __spi_queued_transfer()
2268 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2269 return -ESHUTDOWN; in __spi_queued_transfer()
2271 msg->actual_length = 0; in __spi_queued_transfer()
2272 msg->status = -EINPROGRESS; in __spi_queued_transfer()
2274 list_add_tail(&msg->queue, &ctlr->queue); in __spi_queued_transfer()
2275 ctlr->queue_empty = false; in __spi_queued_transfer()
2276 if (!ctlr->busy && need_pump) in __spi_queued_transfer()
2277 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in __spi_queued_transfer()
2279 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2284 * spi_queued_transfer - transfer function for queued transfers
2285 * @spi: SPI device which is requesting transfer
2286 * @msg: SPI message which is to handled is queued to driver queue
2290 static int spi_queued_transfer(struct spi_device *spi, struct spi_message *msg) in spi_queued_transfer() argument
2292 return __spi_queued_transfer(spi, msg, true); in spi_queued_transfer()
2299 ctlr->transfer = spi_queued_transfer; in spi_controller_initialize_queue()
2300 if (!ctlr->transfer_one_message) in spi_controller_initialize_queue()
2301 ctlr->transfer_one_message = spi_transfer_one_message; in spi_controller_initialize_queue()
2306 dev_err(&ctlr->dev, "problem initializing queue\n"); in spi_controller_initialize_queue()
2309 ctlr->queued = true; in spi_controller_initialize_queue()
2312 dev_err(&ctlr->dev, "problem starting queue\n"); in spi_controller_initialize_queue()
2325 * spi_flush_queue - Send all pending messages in the queue from the callers'
2330 * sent before doing something. Is used by the spi-mem code to make sure SPI
2331 * memory operations do not preempt regular SPI transfers that have been queued
2332 * before the spi-mem operation.
2336 if (ctlr->transfer == spi_queued_transfer) in spi_flush_queue()
2340 /*-------------------------------------------------------------------------*/
2344 struct spi_delay *delay, const char *prop) in of_spi_parse_dt_cs_delay() argument
2350 delay->value = DIV_ROUND_UP(value, 1000); in of_spi_parse_dt_cs_delay()
2351 delay->unit = SPI_DELAY_UNIT_USECS; in of_spi_parse_dt_cs_delay()
2353 delay->value = value; in of_spi_parse_dt_cs_delay()
2354 delay->unit = SPI_DELAY_UNIT_NSECS; in of_spi_parse_dt_cs_delay()
2359 static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, in of_spi_parse_dt() argument
2362 u32 value, cs[SPI_CS_CNT_MAX]; in of_spi_parse_dt() local
2366 if (of_property_read_bool(nc, "spi-cpha")) in of_spi_parse_dt()
2367 spi->mode |= SPI_CPHA; in of_spi_parse_dt()
2368 if (of_property_read_bool(nc, "spi-cpol")) in of_spi_parse_dt()
2369 spi->mode |= SPI_CPOL; in of_spi_parse_dt()
2370 if (of_property_read_bool(nc, "spi-3wire")) in of_spi_parse_dt()
2371 spi->mode |= SPI_3WIRE; in of_spi_parse_dt()
2372 if (of_property_read_bool(nc, "spi-lsb-first")) in of_spi_parse_dt()
2373 spi->mode |= SPI_LSB_FIRST; in of_spi_parse_dt()
2374 if (of_property_read_bool(nc, "spi-cs-high")) in of_spi_parse_dt()
2375 spi->mode |= SPI_CS_HIGH; in of_spi_parse_dt()
2378 if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { in of_spi_parse_dt()
2381 spi->mode |= SPI_NO_TX; in of_spi_parse_dt()
2386 spi->mode |= SPI_TX_DUAL; in of_spi_parse_dt()
2389 spi->mode |= SPI_TX_QUAD; in of_spi_parse_dt()
2392 spi->mode |= SPI_TX_OCTAL; in of_spi_parse_dt()
2395 dev_warn(&ctlr->dev, in of_spi_parse_dt()
2396 "spi-tx-bus-width %d not supported\n", in of_spi_parse_dt()
2402 if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) { in of_spi_parse_dt()
2405 spi->mode |= SPI_NO_RX; in of_spi_parse_dt()
2410 spi->mode |= SPI_RX_DUAL; in of_spi_parse_dt()
2413 spi->mode |= SPI_RX_QUAD; in of_spi_parse_dt()
2416 spi->mode |= SPI_RX_OCTAL; in of_spi_parse_dt()
2419 dev_warn(&ctlr->dev, in of_spi_parse_dt()
2420 "spi-rx-bus-width %d not supported\n", in of_spi_parse_dt()
2428 dev_err(&ctlr->dev, "%pOF is not called 'slave'\n", in of_spi_parse_dt()
2430 return -EINVAL; in of_spi_parse_dt()
2435 if (ctlr->num_chipselect > SPI_CS_CNT_MAX) { in of_spi_parse_dt()
2436 dev_err(&ctlr->dev, "No. of CS is more than max. no. of supported CS\n"); in of_spi_parse_dt()
2437 return -EINVAL; in of_spi_parse_dt()
2440 spi_set_all_cs_unused(spi); in of_spi_parse_dt()
2443 rc = of_property_read_variable_u32_array(nc, "reg", &cs[0], 1, in of_spi_parse_dt()
2446 dev_err(&ctlr->dev, "%pOF has no valid 'reg' property (%d)\n", in of_spi_parse_dt()
2450 if (rc > ctlr->num_chipselect) { in of_spi_parse_dt()
2451 dev_err(&ctlr->dev, "%pOF has number of CS > ctlr->num_chipselect (%d)\n", in of_spi_parse_dt()
2455 if ((of_property_present(nc, "parallel-memories")) && in of_spi_parse_dt()
2456 (!(ctlr->flags & SPI_CONTROLLER_MULTI_CS))) { in of_spi_parse_dt()
2457 dev_err(&ctlr->dev, "SPI controller doesn't support multi CS\n"); in of_spi_parse_dt()
2458 return -EINVAL; in of_spi_parse_dt()
2461 spi_set_chipselect(spi, idx, cs[idx]); in of_spi_parse_dt()
2464 * By default spi->chip_select[0] will hold the physical CS number, in of_spi_parse_dt()
2465 * so set bit 0 in spi->cs_index_mask. in of_spi_parse_dt()
2467 spi->cs_index_mask = BIT(0); in of_spi_parse_dt()
2470 if (!of_property_read_u32(nc, "spi-max-frequency", &value)) in of_spi_parse_dt()
2471 spi->max_speed_hz = value; in of_spi_parse_dt()
2473 /* Device CS delays */ in of_spi_parse_dt()
2474 of_spi_parse_dt_cs_delay(nc, &spi->cs_setup, "spi-cs-setup-delay-ns"); in of_spi_parse_dt()
2475 of_spi_parse_dt_cs_delay(nc, &spi->cs_hold, "spi-cs-hold-delay-ns"); in of_spi_parse_dt()
2476 of_spi_parse_dt_cs_delay(nc, &spi->cs_inactive, "spi-cs-inactive-delay-ns"); in of_spi_parse_dt()
2484 struct spi_device *spi; in of_register_spi_device() local
2488 spi = spi_alloc_device(ctlr); in of_register_spi_device()
2489 if (!spi) { in of_register_spi_device()
2490 dev_err(&ctlr->dev, "spi_device alloc error for %pOF\n", nc); in of_register_spi_device()
2491 rc = -ENOMEM; in of_register_spi_device()
2496 rc = of_alias_from_compatible(nc, spi->modalias, in of_register_spi_device()
2497 sizeof(spi->modalias)); in of_register_spi_device()
2499 dev_err(&ctlr->dev, "cannot find modalias for %pOF\n", nc); in of_register_spi_device()
2503 rc = of_spi_parse_dt(ctlr, spi, nc); in of_register_spi_device()
2510 device_set_node(&spi->dev, of_fwnode_handle(nc)); in of_register_spi_device()
2513 rc = spi_add_device(spi); in of_register_spi_device()
2515 dev_err(&ctlr->dev, "spi_device register error %pOF\n", nc); in of_register_spi_device()
2519 return spi; in of_register_spi_device()
2524 spi_dev_put(spi); in of_register_spi_device()
2529 * of_register_spi_devices() - Register child devices onto the SPI bus
2533 * represents a valid SPI target device.
2537 struct spi_device *spi; in of_register_spi_devices() local
2540 for_each_available_child_of_node(ctlr->dev.of_node, nc) { in of_register_spi_devices()
2543 spi = of_register_spi_device(ctlr, nc); in of_register_spi_devices()
2544 if (IS_ERR(spi)) { in of_register_spi_devices()
2545 dev_warn(&ctlr->dev, in of_register_spi_devices()
2546 "Failed to create SPI device for %pOF\n", nc); in of_register_spi_devices()
2556 * spi_new_ancillary_device() - Register ancillary SPI device
2557 * @spi: Pointer to the main SPI device registering the ancillary device
2560 * Register an ancillary SPI device; for example some chips have a chip-select
2563 * This may only be called from main SPI device's probe routine.
2567 struct spi_device *spi_new_ancillary_device(struct spi_device *spi, in spi_new_ancillary_device() argument
2570 struct spi_controller *ctlr = spi->controller; in spi_new_ancillary_device()
2577 rc = -ENOMEM; in spi_new_ancillary_device()
2581 strscpy(ancillary->modalias, "dummy", sizeof(ancillary->modalias)); in spi_new_ancillary_device()
2583 /* Use provided chip-select for ancillary device */ in spi_new_ancillary_device()
2587 /* Take over SPI mode/speed from SPI main device */ in spi_new_ancillary_device()
2588 ancillary->max_speed_hz = spi->max_speed_hz; in spi_new_ancillary_device()
2589 ancillary->mode = spi->mode; in spi_new_ancillary_device()
2591 * By default spi->chip_select[0] will hold the physical CS number, in spi_new_ancillary_device()
2592 * so set bit 0 in spi->cs_index_mask. in spi_new_ancillary_device()
2594 ancillary->cs_index_mask = BIT(0); in spi_new_ancillary_device()
2596 WARN_ON(!mutex_is_locked(&ctlr->add_lock)); in spi_new_ancillary_device()
2601 dev_err(&spi->dev, "failed to register ancillary device\n"); in spi_new_ancillary_device()
2630 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) in acpi_spi_count()
2633 sb = &ares->data.spi_serial_bus; in acpi_spi_count()
2634 if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_SPI) in acpi_spi_count()
2643 * acpi_spi_count_resources - Count the number of SpiSerialBus resources
2646 * Return: the number of SpiSerialBus resources in the ACPI-device's
2647 * resource-list; or a negative error code.
2674 && obj->buffer.length >= 4) in acpi_spi_parse_apple_properties()
2675 lookup->max_speed_hz = NSEC_PER_SEC / *(u32 *)obj->buffer.pointer; in acpi_spi_parse_apple_properties()
2678 && obj->buffer.length == 8) in acpi_spi_parse_apple_properties()
2679 lookup->bits_per_word = *(u64 *)obj->buffer.pointer; in acpi_spi_parse_apple_properties()
2682 && obj->buffer.length == 8 && !*(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2683 lookup->mode |= SPI_LSB_FIRST; in acpi_spi_parse_apple_properties()
2686 && obj->buffer.length == 8 && *(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2687 lookup->mode |= SPI_CPOL; in acpi_spi_parse_apple_properties()
2690 && obj->buffer.length == 8 && *(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2691 lookup->mode |= SPI_CPHA; in acpi_spi_parse_apple_properties()
2697 struct spi_controller *ctlr = lookup->ctlr; in acpi_spi_add_resource()
2699 if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { in acpi_spi_add_resource()
2704 sb = &ares->data.spi_serial_bus; in acpi_spi_add_resource()
2705 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_SPI) { in acpi_spi_add_resource()
2707 if (lookup->index != -1 && lookup->n++ != lookup->index) in acpi_spi_add_resource()
2711 sb->resource_source.string_ptr, in acpi_spi_add_resource()
2715 return -ENODEV; in acpi_spi_add_resource()
2718 if (!device_match_acpi_handle(ctlr->dev.parent, parent_handle)) in acpi_spi_add_resource()
2719 return -ENODEV; in acpi_spi_add_resource()
2725 return -ENODEV; in acpi_spi_add_resource()
2729 return -EPROBE_DEFER; in acpi_spi_add_resource()
2731 lookup->ctlr = ctlr; in acpi_spi_add_resource()
2738 * 0 .. max - 1 so we need to ask the driver to in acpi_spi_add_resource()
2741 if (ctlr->fw_translate_cs) { in acpi_spi_add_resource()
2742 int cs = ctlr->fw_translate_cs(ctlr, in acpi_spi_add_resource() local
2743 sb->device_selection); in acpi_spi_add_resource()
2744 if (cs < 0) in acpi_spi_add_resource()
2745 return cs; in acpi_spi_add_resource()
2746 lookup->chip_select = cs; in acpi_spi_add_resource()
2748 lookup->chip_select = sb->device_selection; in acpi_spi_add_resource()
2751 lookup->max_speed_hz = sb->connection_speed; in acpi_spi_add_resource()
2752 lookup->bits_per_word = sb->data_bit_length; in acpi_spi_add_resource()
2754 if (sb->clock_phase == ACPI_SPI_SECOND_PHASE) in acpi_spi_add_resource()
2755 lookup->mode |= SPI_CPHA; in acpi_spi_add_resource()
2756 if (sb->clock_polarity == ACPI_SPI_START_HIGH) in acpi_spi_add_resource()
2757 lookup->mode |= SPI_CPOL; in acpi_spi_add_resource()
2758 if (sb->device_polarity == ACPI_SPI_ACTIVE_HIGH) in acpi_spi_add_resource()
2759 lookup->mode |= SPI_CS_HIGH; in acpi_spi_add_resource()
2761 } else if (lookup->irq < 0) { in acpi_spi_add_resource()
2765 lookup->irq = r.start; in acpi_spi_add_resource()
2773 * acpi_spi_device_alloc - Allocate a spi device, and fill it in with ACPI information
2774 * @ctlr: controller to which the spi device belongs
2775 * @adev: ACPI Device for the spi device
2776 * @index: Index of the spi resource inside the ACPI Node
2778 * This should be used to allocate a new SPI device from and ACPI Device node.
2779 * The caller is responsible for calling spi_add_device to register the SPI device.
2781 * If ctlr is set to NULL, the Controller for the SPI device will be looked up
2783 * If index is set to -1, index is not used.
2784 * Note: If index is -1, ctlr must be set.
2795 struct spi_device *spi; in acpi_spi_device_alloc() local
2798 if (!ctlr && index == -1) in acpi_spi_device_alloc()
2799 return ERR_PTR(-EINVAL); in acpi_spi_device_alloc()
2802 lookup.irq = -1; in acpi_spi_device_alloc()
2812 /* Found SPI in _CRS but it points to another controller */ in acpi_spi_device_alloc()
2816 ACPI_SUCCESS(acpi_get_parent(adev->handle, &parent_handle)) && in acpi_spi_device_alloc()
2817 device_match_acpi_handle(lookup.ctlr->dev.parent, parent_handle)) { in acpi_spi_device_alloc()
2818 /* Apple does not use _CRS but nested devices for SPI target devices */ in acpi_spi_device_alloc()
2823 return ERR_PTR(-ENODEV); in acpi_spi_device_alloc()
2825 spi = spi_alloc_device(lookup.ctlr); in acpi_spi_device_alloc()
2826 if (!spi) { in acpi_spi_device_alloc()
2827 dev_err(&lookup.ctlr->dev, "failed to allocate SPI device for %s\n", in acpi_spi_device_alloc()
2828 dev_name(&adev->dev)); in acpi_spi_device_alloc()
2829 return ERR_PTR(-ENOMEM); in acpi_spi_device_alloc()
2832 spi_set_all_cs_unused(spi); in acpi_spi_device_alloc()
2833 spi_set_chipselect(spi, 0, lookup.chip_select); in acpi_spi_device_alloc()
2835 ACPI_COMPANION_SET(&spi->dev, adev); in acpi_spi_device_alloc()
2836 spi->max_speed_hz = lookup.max_speed_hz; in acpi_spi_device_alloc()
2837 spi->mode |= lookup.mode; in acpi_spi_device_alloc()
2838 spi->irq = lookup.irq; in acpi_spi_device_alloc()
2839 spi->bits_per_word = lookup.bits_per_word; in acpi_spi_device_alloc()
2841 * By default spi->chip_select[0] will hold the physical CS number, in acpi_spi_device_alloc()
2842 * so set bit 0 in spi->cs_index_mask. in acpi_spi_device_alloc()
2844 spi->cs_index_mask = BIT(0); in acpi_spi_device_alloc()
2846 return spi; in acpi_spi_device_alloc()
2853 struct spi_device *spi; in acpi_register_spi_device() local
2855 if (acpi_bus_get_status(adev) || !adev->status.present || in acpi_register_spi_device()
2859 spi = acpi_spi_device_alloc(ctlr, adev, -1); in acpi_register_spi_device()
2860 if (IS_ERR(spi)) { in acpi_register_spi_device()
2861 if (PTR_ERR(spi) == -ENOMEM) in acpi_register_spi_device()
2867 acpi_set_modalias(adev, acpi_device_hid(adev), spi->modalias, in acpi_register_spi_device()
2868 sizeof(spi->modalias)); in acpi_register_spi_device()
2872 adev->power.flags.ignore_parent = true; in acpi_register_spi_device()
2873 if (spi_add_device(spi)) { in acpi_register_spi_device()
2874 adev->power.flags.ignore_parent = false; in acpi_register_spi_device()
2875 dev_err(&ctlr->dev, "failed to add SPI device %s from ACPI\n", in acpi_register_spi_device()
2876 dev_name(&adev->dev)); in acpi_register_spi_device()
2877 spi_dev_put(spi); in acpi_register_spi_device()
2902 handle = ACPI_HANDLE(ctlr->dev.parent); in acpi_register_spi_devices()
2910 dev_warn(&ctlr->dev, "failed to enumerate SPI target devices\n"); in acpi_register_spi_devices()
2932 * spi_target_abort - abort the ongoing transfer request on an SPI target controller
2933 * @spi: device used for the current transfer
2935 int spi_target_abort(struct spi_device *spi) in spi_target_abort() argument
2937 struct spi_controller *ctlr = spi->controller; in spi_target_abort()
2939 if (spi_controller_is_target(ctlr) && ctlr->target_abort) in spi_target_abort()
2940 return ctlr->target_abort(ctlr); in spi_target_abort()
2942 return -ENOTSUPP; in spi_target_abort()
2954 child = device_find_any_child(&ctlr->dev); in slave_show()
2955 ret = sysfs_emit(buf, "%s\n", child ? to_spi_device(child)->modalias : NULL); in slave_show()
2966 struct spi_device *spi; in slave_store() local
2973 return -EINVAL; in slave_store()
2975 child = device_find_any_child(&ctlr->dev); in slave_store()
2984 spi = spi_alloc_device(ctlr); in slave_store()
2985 if (!spi) in slave_store()
2986 return -ENOMEM; in slave_store()
2988 strscpy(spi->modalias, name, sizeof(spi->modalias)); in slave_store()
2990 rc = spi_add_device(spi); in slave_store()
2992 spi_dev_put(spi); in slave_store()
3027 * __spi_alloc_controller - allocate an SPI host or target controller
3029 * @size: how much zeroed driver-private data to allocate; the pointer to this
3034 * @target: flag indicating whether to allocate an SPI host (false) or SPI target (true)
3038 * This call is used only by SPI controller drivers, which are the
3049 * Return: the SPI controller structure on success, else NULL.
3064 device_initialize(&ctlr->dev); in __spi_alloc_controller()
3065 INIT_LIST_HEAD(&ctlr->queue); in __spi_alloc_controller()
3066 spin_lock_init(&ctlr->queue_lock); in __spi_alloc_controller()
3067 spin_lock_init(&ctlr->bus_lock_spinlock); in __spi_alloc_controller()
3068 mutex_init(&ctlr->bus_lock_mutex); in __spi_alloc_controller()
3069 mutex_init(&ctlr->io_mutex); in __spi_alloc_controller()
3070 mutex_init(&ctlr->add_lock); in __spi_alloc_controller()
3071 ctlr->bus_num = -1; in __spi_alloc_controller()
3072 ctlr->num_chipselect = 1; in __spi_alloc_controller()
3073 ctlr->target = target; in __spi_alloc_controller()
3075 ctlr->dev.class = &spi_target_class; in __spi_alloc_controller()
3077 ctlr->dev.class = &spi_controller_class; in __spi_alloc_controller()
3078 ctlr->dev.parent = dev; in __spi_alloc_controller()
3079 pm_suspend_ignore_children(&ctlr->dev, true); in __spi_alloc_controller()
3092 * __devm_spi_alloc_controller - resource-managed __spi_alloc_controller()
3093 * @dev: physical device of SPI controller
3094 * @size: how much zeroed driver-private data to allocate
3095 * @target: whether to allocate an SPI host (false) or SPI target (true) controller
3098 * Allocate an SPI controller and automatically release a reference on it
3104 * Return: the SPI controller structure on success, else NULL.
3119 ctlr->devm_allocated = true; in __devm_spi_alloc_controller()
3131 * spi_get_gpio_descs() - grab chip select GPIOs for the controller
3132 * @ctlr: The SPI controller to grab GPIO descriptors for
3137 struct gpio_desc **cs; in spi_get_gpio_descs() local
3138 struct device *dev = &ctlr->dev; in spi_get_gpio_descs()
3142 nb = gpiod_count(dev, "cs"); in spi_get_gpio_descs()
3145 if (nb == -ENOENT) in spi_get_gpio_descs()
3150 ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect); in spi_get_gpio_descs()
3152 cs = devm_kcalloc(dev, ctlr->num_chipselect, sizeof(*cs), in spi_get_gpio_descs()
3154 if (!cs) in spi_get_gpio_descs()
3155 return -ENOMEM; in spi_get_gpio_descs()
3156 ctlr->cs_gpiods = cs; in spi_get_gpio_descs()
3166 cs[i] = devm_gpiod_get_index_optional(dev, "cs", i, in spi_get_gpio_descs()
3168 if (IS_ERR(cs[i])) in spi_get_gpio_descs()
3169 return PTR_ERR(cs[i]); in spi_get_gpio_descs()
3171 if (cs[i]) { in spi_get_gpio_descs()
3173 * If we find a CS GPIO, name it after the device and in spi_get_gpio_descs()
3178 gpioname = devm_kasprintf(dev, GFP_KERNEL, "%s CS%d", in spi_get_gpio_descs()
3181 return -ENOMEM; in spi_get_gpio_descs()
3182 gpiod_set_consumer_name(cs[i], gpioname); in spi_get_gpio_descs()
3187 if (ctlr->max_native_cs && i >= ctlr->max_native_cs) { in spi_get_gpio_descs()
3189 return -EINVAL; in spi_get_gpio_descs()
3194 ctlr->unused_native_cs = ffs(~native_cs_mask) - 1; in spi_get_gpio_descs()
3196 if ((ctlr->flags & SPI_CONTROLLER_GPIO_SS) && num_cs_gpios && in spi_get_gpio_descs()
3197 ctlr->max_native_cs && ctlr->unused_native_cs >= ctlr->max_native_cs) { in spi_get_gpio_descs()
3199 return -EINVAL; in spi_get_gpio_descs()
3208 * The controller may implement only the high-level SPI-memory like in spi_controller_check_ops()
3209 * operations if it does not support regular SPI transfers, and this is in spi_controller_check_ops()
3211 * If ->mem_ops or ->mem_ops->exec_op is NULL, we request that at least in spi_controller_check_ops()
3212 * one of the ->transfer_xxx() method be implemented. in spi_controller_check_ops()
3214 if (!ctlr->mem_ops || !ctlr->mem_ops->exec_op) { in spi_controller_check_ops()
3215 if (!ctlr->transfer && !ctlr->transfer_one && in spi_controller_check_ops()
3216 !ctlr->transfer_one_message) { in spi_controller_check_ops()
3217 return -EINVAL; in spi_controller_check_ops()
3233 return id == -ENOSPC ? -EBUSY : id; in spi_controller_id_alloc()
3234 ctlr->bus_num = id; in spi_controller_id_alloc()
3239 * spi_register_controller - register SPI host or target controller
3244 * SPI controllers connect to their drivers using some non-SPI bus,
3246 * includes calling spi_register_controller() to hook up to this SPI bus glue.
3248 * SPI controllers use board specific (often SOC specific) bus numbers,
3249 * and board-specific addressing for SPI devices combines those numbers
3250 * with chip select numbers. Since SPI does not directly support dynamic
3263 struct device *dev = ctlr->dev.parent; in spi_register_controller()
3270 return -ENODEV; in spi_register_controller()
3274 * the SPI controller. in spi_register_controller()
3280 if (ctlr->bus_num < 0) in spi_register_controller()
3281 ctlr->bus_num = of_alias_get_id(ctlr->dev.of_node, "spi"); in spi_register_controller()
3282 if (ctlr->bus_num >= 0) { in spi_register_controller()
3283 /* Devices with a fixed bus num must check-in with the num */ in spi_register_controller()
3284 status = spi_controller_id_alloc(ctlr, ctlr->bus_num, ctlr->bus_num + 1); in spi_register_controller()
3288 if (ctlr->bus_num < 0) { in spi_register_controller()
3289 first_dynamic = of_alias_get_highest_id("spi"); in spi_register_controller()
3299 ctlr->bus_lock_flag = 0; in spi_register_controller()
3300 init_completion(&ctlr->xfer_completion); in spi_register_controller()
3301 init_completion(&ctlr->cur_msg_completion); in spi_register_controller()
3302 if (!ctlr->max_dma_len) in spi_register_controller()
3303 ctlr->max_dma_len = INT_MAX; in spi_register_controller()
3309 dev_set_name(&ctlr->dev, "spi%u", ctlr->bus_num); in spi_register_controller()
3311 if (!spi_controller_is_target(ctlr) && ctlr->use_gpio_descriptors) { in spi_register_controller()
3319 ctlr->mode_bits |= SPI_CS_HIGH; in spi_register_controller()
3323 * Even if it's just one always-selected device, there must in spi_register_controller()
3326 if (!ctlr->num_chipselect) { in spi_register_controller()
3327 status = -EINVAL; in spi_register_controller()
3333 ctlr->last_cs[idx] = SPI_INVALID_CS; in spi_register_controller()
3335 status = device_add(&ctlr->dev); in spi_register_controller()
3340 dev_name(&ctlr->dev)); in spi_register_controller()
3344 * need the queueing logic if the driver is only supporting high-level in spi_register_controller()
3347 if (ctlr->transfer) { in spi_register_controller()
3349 } else if (ctlr->transfer_one || ctlr->transfer_one_message) { in spi_register_controller()
3352 device_del(&ctlr->dev); in spi_register_controller()
3357 ctlr->pcpu_statistics = spi_alloc_pcpu_stats(dev); in spi_register_controller()
3358 if (!ctlr->pcpu_statistics) { in spi_register_controller()
3359 dev_err(dev, "Error allocating per-cpu statistics\n"); in spi_register_controller()
3360 status = -ENOMEM; in spi_register_controller()
3365 list_add_tail(&ctlr->list, &spi_controller_list); in spi_register_controller()
3367 spi_match_controller_to_boardinfo(ctlr, &bi->board_info); in spi_register_controller()
3379 idr_remove(&spi_controller_idr, ctlr->bus_num); in spi_register_controller()
3391 * devm_spi_register_controller - register managed SPI host or target controller
3392 * @dev: device managing SPI controller
3397 * Register a SPI device as with spi_register_controller() which will
3410 return -ENOMEM; in devm_spi_register_controller()
3431 * spi_unregister_controller - unregister SPI host or target controller
3435 * This call is used only by SPI controller drivers, which are the
3445 int id = ctlr->bus_num; in spi_unregister_controller()
3449 mutex_lock(&ctlr->add_lock); in spi_unregister_controller()
3451 device_for_each_child(&ctlr->dev, NULL, __unregister); in spi_unregister_controller()
3457 if (ctlr->queued) { in spi_unregister_controller()
3459 dev_err(&ctlr->dev, "queue remove failed\n"); in spi_unregister_controller()
3462 list_del(&ctlr->list); in spi_unregister_controller()
3465 device_del(&ctlr->dev); in spi_unregister_controller()
3474 mutex_unlock(&ctlr->add_lock); in spi_unregister_controller()
3480 if (!ctlr->devm_allocated) in spi_unregister_controller()
3481 put_device(&ctlr->dev); in spi_unregister_controller()
3487 return ctlr->flags & SPI_CONTROLLER_SUSPENDED ? -ESHUTDOWN : 0; in __spi_check_suspended()
3492 mutex_lock(&ctlr->bus_lock_mutex); in __spi_mark_suspended()
3493 ctlr->flags |= SPI_CONTROLLER_SUSPENDED; in __spi_mark_suspended()
3494 mutex_unlock(&ctlr->bus_lock_mutex); in __spi_mark_suspended()
3499 mutex_lock(&ctlr->bus_lock_mutex); in __spi_mark_resumed()
3500 ctlr->flags &= ~SPI_CONTROLLER_SUSPENDED; in __spi_mark_resumed()
3501 mutex_unlock(&ctlr->bus_lock_mutex); in __spi_mark_resumed()
3508 /* Basically no-ops for non-queued controllers */ in spi_controller_suspend()
3509 if (ctlr->queued) { in spi_controller_suspend()
3512 dev_err(&ctlr->dev, "queue stop failed\n"); in spi_controller_suspend()
3526 if (ctlr->queued) { in spi_controller_resume()
3529 dev_err(&ctlr->dev, "queue restart failed\n"); in spi_controller_resume()
3535 /*-------------------------------------------------------------------------*/
3547 if (rxfer->release) in __spi_replace_transfers_release()
3548 rxfer->release(ctlr, msg, res); in __spi_replace_transfers_release()
3551 list_splice(&rxfer->replaced_transfers, rxfer->replaced_after); in __spi_replace_transfers_release()
3554 for (i = 0; i < rxfer->inserted; i++) in __spi_replace_transfers_release()
3555 list_del(&rxfer->inserted_transfers[i].transfer_list); in __spi_replace_transfers_release()
3559 * spi_replace_transfers - replace transfers with several transfers
3587 rxfer = spi_res_alloc(msg->spi, __spi_replace_transfers_release, in spi_replace_transfers()
3592 return ERR_PTR(-ENOMEM); in spi_replace_transfers()
3595 rxfer->release = release; in spi_replace_transfers()
3599 rxfer->extradata = in spi_replace_transfers()
3600 &rxfer->inserted_transfers[insert]; in spi_replace_transfers()
3603 INIT_LIST_HEAD(&rxfer->replaced_transfers); in spi_replace_transfers()
3607 * the @replaced_transfers - it may be spi_message.messages! in spi_replace_transfers()
3609 rxfer->replaced_after = xfer_first->transfer_list.prev; in spi_replace_transfers()
3614 * If the entry after replaced_after it is msg->transfers in spi_replace_transfers()
3618 if (rxfer->replaced_after->next == &msg->transfers) { in spi_replace_transfers()
3619 dev_err(&msg->spi->dev, in spi_replace_transfers()
3622 list_splice(&rxfer->replaced_transfers, in spi_replace_transfers()
3623 rxfer->replaced_after); in spi_replace_transfers()
3629 return ERR_PTR(-EINVAL); in spi_replace_transfers()
3636 list_move_tail(rxfer->replaced_after->next, in spi_replace_transfers()
3637 &rxfer->replaced_transfers); in spi_replace_transfers()
3646 xfer = &rxfer->inserted_transfers[insert - 1 - i]; in spi_replace_transfers()
3652 list_add(&xfer->transfer_list, rxfer->replaced_after); in spi_replace_transfers()
3654 /* Clear cs_change and delay for all but the last */ in spi_replace_transfers()
3656 xfer->cs_change = false; in spi_replace_transfers()
3657 xfer->delay.value = 0; in spi_replace_transfers()
3662 rxfer->inserted = insert; in spi_replace_transfers()
3681 count = DIV_ROUND_UP(xfer->len, maxsize); in __spi_split_transfer_maxsize()
3687 xfers = srt->inserted_transfers; in __spi_split_transfer_maxsize()
3712 xfers[i].len = min(maxsize, xfers[i].len - offset); in __spi_split_transfer_maxsize()
3719 *xferp = &xfers[count - 1]; in __spi_split_transfer_maxsize()
3722 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, in __spi_split_transfer_maxsize()
3724 SPI_STATISTICS_INCREMENT_FIELD(msg->spi->pcpu_statistics, in __spi_split_transfer_maxsize()
3731 * spi_split_transfers_maxsize - split spi transfers into multiple transfers
3739 * spi message unoptimize phase so this function should only be called from
3758 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_split_transfers_maxsize()
3759 if (xfer->len > maxsize) { in spi_split_transfers_maxsize()
3773 * spi_split_transfers_maxwords - split SPI transfers into multiple transfers
3775 * certain number of SPI words
3781 * spi message unoptimize phase so this function should only be called from
3799 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_split_transfers_maxwords()
3803 maxsize = maxwords * spi_bpw_to_bytes(xfer->bits_per_word); in spi_split_transfers_maxwords()
3804 if (xfer->len > maxsize) { in spi_split_transfers_maxwords()
3816 /*-------------------------------------------------------------------------*/
3819 * Core methods for SPI controller protocol drivers. Some of the
3826 if (ctlr->bits_per_word_mask) { in __spi_validate_bits_per_word()
3829 return -EINVAL; in __spi_validate_bits_per_word()
3830 if (!(ctlr->bits_per_word_mask & SPI_BPW_MASK(bits_per_word))) in __spi_validate_bits_per_word()
3831 return -EINVAL; in __spi_validate_bits_per_word()
3838 * spi_set_cs_timing - configure CS setup, hold, and inactive delays
3839 * @spi: the device that requires specific CS timing configuration
3843 static int spi_set_cs_timing(struct spi_device *spi) in spi_set_cs_timing() argument
3845 struct device *parent = spi->controller->dev.parent; in spi_set_cs_timing()
3848 if (spi->controller->set_cs_timing && !spi_get_csgpiod(spi, 0)) { in spi_set_cs_timing()
3849 if (spi->controller->auto_runtime_pm) { in spi_set_cs_timing()
3853 dev_err(&spi->controller->dev, "Failed to power device: %d\n", in spi_set_cs_timing()
3858 status = spi->controller->set_cs_timing(spi); in spi_set_cs_timing()
3862 status = spi->controller->set_cs_timing(spi); in spi_set_cs_timing()
3869 * spi_setup - setup SPI mode and clock rate
3870 * @spi: the device whose settings are being modified
3873 * SPI protocol drivers may need to update the transfer mode if the
3879 * or from it. When this function returns, the SPI device is deselected.
3884 * LSB-first wire encoding, or active-high chipselects.
3888 int spi_setup(struct spi_device *spi) in spi_setup() argument
3897 if ((hweight_long(spi->mode & in spi_setup()
3899 (hweight_long(spi->mode & in spi_setup()
3901 dev_err(&spi->dev, in spi_setup()
3902 "setup: can not select any two of dual, quad and no-rx/tx at the same time\n"); in spi_setup()
3903 return -EINVAL; in spi_setup()
3906 if ((spi->mode & SPI_3WIRE) && (spi->mode & in spi_setup()
3909 return -EINVAL; in spi_setup()
3911 if ((spi->mode & SPI_MOSI_IDLE_LOW) && (spi->mode & SPI_MOSI_IDLE_HIGH)) { in spi_setup()
3912 dev_err(&spi->dev, in spi_setup()
3914 return -EINVAL; in spi_setup()
3922 bad_bits = spi->mode & ~(spi->controller->mode_bits | SPI_CS_WORD | in spi_setup()
3928 dev_warn(&spi->dev, in spi_setup()
3931 spi->mode &= ~ugly_bits; in spi_setup()
3935 dev_err(&spi->dev, "setup: unsupported mode bits %x\n", in spi_setup()
3937 return -EINVAL; in spi_setup()
3940 if (!spi->bits_per_word) { in spi_setup()
3941 spi->bits_per_word = 8; in spi_setup()
3944 * Some controllers may not support the default 8 bits-per-word in spi_setup()
3947 status = __spi_validate_bits_per_word(spi->controller, in spi_setup()
3948 spi->bits_per_word); in spi_setup()
3953 if (spi->controller->max_speed_hz && in spi_setup()
3954 (!spi->max_speed_hz || in spi_setup()
3955 spi->max_speed_hz > spi->controller->max_speed_hz)) in spi_setup()
3956 spi->max_speed_hz = spi->controller->max_speed_hz; in spi_setup()
3958 mutex_lock(&spi->controller->io_mutex); in spi_setup()
3960 if (spi->controller->setup) { in spi_setup()
3961 status = spi->controller->setup(spi); in spi_setup()
3963 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3964 dev_err(&spi->controller->dev, "Failed to setup device: %d\n", in spi_setup()
3970 status = spi_set_cs_timing(spi); in spi_setup()
3972 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3976 if (spi->controller->auto_runtime_pm && spi->controller->set_cs) { in spi_setup()
3977 status = pm_runtime_resume_and_get(spi->controller->dev.parent); in spi_setup()
3979 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3980 dev_err(&spi->controller->dev, "Failed to power device: %d\n", in spi_setup()
3988 * checking for a non-zero return value instead of a negative in spi_setup()
3993 spi_set_cs(spi, false, true); in spi_setup()
3994 pm_runtime_mark_last_busy(spi->controller->dev.parent); in spi_setup()
3995 pm_runtime_put_autosuspend(spi->controller->dev.parent); in spi_setup()
3997 spi_set_cs(spi, false, true); in spi_setup()
4000 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
4002 if (spi->rt && !spi->controller->rt) { in spi_setup()
4003 spi->controller->rt = true; in spi_setup()
4004 spi_set_thread_rt(spi->controller); in spi_setup()
4007 trace_spi_setup(spi, status); in spi_setup()
4009 dev_dbg(&spi->dev, "setup mode %lu, %s%s%s%s%u bits/w, %u Hz max --> %d\n", in spi_setup()
4010 spi->mode & SPI_MODE_X_MASK, in spi_setup()
4011 (spi->mode & SPI_CS_HIGH) ? "cs_high, " : "", in spi_setup()
4012 (spi->mode & SPI_LSB_FIRST) ? "lsb, " : "", in spi_setup()
4013 (spi->mode & SPI_3WIRE) ? "3wire, " : "", in spi_setup()
4014 (spi->mode & SPI_LOOP) ? "loopback, " : "", in spi_setup()
4015 spi->bits_per_word, spi->max_speed_hz, in spi_setup()
4023 struct spi_device *spi) in _spi_xfer_word_delay_update() argument
4027 delay1 = spi_delay_to_ns(&xfer->word_delay, xfer); in _spi_xfer_word_delay_update()
4031 delay2 = spi_delay_to_ns(&spi->word_delay, xfer); in _spi_xfer_word_delay_update()
4036 memcpy(&xfer->word_delay, &spi->word_delay, in _spi_xfer_word_delay_update()
4037 sizeof(xfer->word_delay)); in _spi_xfer_word_delay_update()
4042 static int __spi_validate(struct spi_device *spi, struct spi_message *message) in __spi_validate() argument
4044 struct spi_controller *ctlr = spi->controller; in __spi_validate()
4048 if (list_empty(&message->transfers)) in __spi_validate()
4049 return -EINVAL; in __spi_validate()
4051 message->spi = spi; in __spi_validate()
4054 * Half-duplex links include original MicroWire, and ones with in __spi_validate()
4059 if ((ctlr->flags & SPI_CONTROLLER_HALF_DUPLEX) || in __spi_validate()
4060 (spi->mode & SPI_3WIRE)) { in __spi_validate()
4061 unsigned flags = ctlr->flags; in __spi_validate()
4063 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_validate()
4064 if (xfer->rx_buf && xfer->tx_buf) in __spi_validate()
4065 return -EINVAL; in __spi_validate()
4066 if ((flags & SPI_CONTROLLER_NO_TX) && xfer->tx_buf) in __spi_validate()
4067 return -EINVAL; in __spi_validate()
4068 if ((flags & SPI_CONTROLLER_NO_RX) && xfer->rx_buf) in __spi_validate()
4069 return -EINVAL; in __spi_validate()
4074 * Set transfer bits_per_word and max speed as spi device default if in __spi_validate()
4081 message->frame_length = 0; in __spi_validate()
4082 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_validate()
4083 xfer->effective_speed_hz = 0; in __spi_validate()
4084 message->frame_length += xfer->len; in __spi_validate()
4085 if (!xfer->bits_per_word) in __spi_validate()
4086 xfer->bits_per_word = spi->bits_per_word; in __spi_validate()
4088 if (!xfer->speed_hz) in __spi_validate()
4089 xfer->speed_hz = spi->max_speed_hz; in __spi_validate()
4091 if (ctlr->max_speed_hz && xfer->speed_hz > ctlr->max_speed_hz) in __spi_validate()
4092 xfer->speed_hz = ctlr->max_speed_hz; in __spi_validate()
4094 if (__spi_validate_bits_per_word(ctlr, xfer->bits_per_word)) in __spi_validate()
4095 return -EINVAL; in __spi_validate()
4098 * default considered as SDR mode for SPI and QSPI controller. in __spi_validate()
4101 if (xfer->dtr_mode && !ctlr->dtr_caps) in __spi_validate()
4102 return -EINVAL; in __spi_validate()
4105 * SPI transfer length should be multiple of SPI word size in __spi_validate()
4106 * where SPI word size should be power-of-two multiple. in __spi_validate()
4108 if (xfer->bits_per_word <= 8) in __spi_validate()
4110 else if (xfer->bits_per_word <= 16) in __spi_validate()
4116 if (xfer->len % w_size) in __spi_validate()
4117 return -EINVAL; in __spi_validate()
4119 if (xfer->speed_hz && ctlr->min_speed_hz && in __spi_validate()
4120 xfer->speed_hz < ctlr->min_speed_hz) in __spi_validate()
4121 return -EINVAL; in __spi_validate()
4123 if (xfer->tx_buf && !xfer->tx_nbits) in __spi_validate()
4124 xfer->tx_nbits = SPI_NBITS_SINGLE; in __spi_validate()
4125 if (xfer->rx_buf && !xfer->rx_nbits) in __spi_validate()
4126 xfer->rx_nbits = SPI_NBITS_SINGLE; in __spi_validate()
4132 if (xfer->tx_buf) { in __spi_validate()
4133 if (spi->mode & SPI_NO_TX) in __spi_validate()
4134 return -EINVAL; in __spi_validate()
4135 if (xfer->tx_nbits != SPI_NBITS_SINGLE && in __spi_validate()
4136 xfer->tx_nbits != SPI_NBITS_DUAL && in __spi_validate()
4137 xfer->tx_nbits != SPI_NBITS_QUAD && in __spi_validate()
4138 xfer->tx_nbits != SPI_NBITS_OCTAL) in __spi_validate()
4139 return -EINVAL; in __spi_validate()
4140 if ((xfer->tx_nbits == SPI_NBITS_DUAL) && in __spi_validate()
4141 !(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD))) in __spi_validate()
4142 return -EINVAL; in __spi_validate()
4143 if ((xfer->tx_nbits == SPI_NBITS_QUAD) && in __spi_validate()
4144 !(spi->mode & SPI_TX_QUAD)) in __spi_validate()
4145 return -EINVAL; in __spi_validate()
4148 if (xfer->rx_buf) { in __spi_validate()
4149 if (spi->mode & SPI_NO_RX) in __spi_validate()
4150 return -EINVAL; in __spi_validate()
4151 if (xfer->rx_nbits != SPI_NBITS_SINGLE && in __spi_validate()
4152 xfer->rx_nbits != SPI_NBITS_DUAL && in __spi_validate()
4153 xfer->rx_nbits != SPI_NBITS_QUAD && in __spi_validate()
4154 xfer->rx_nbits != SPI_NBITS_OCTAL) in __spi_validate()
4155 return -EINVAL; in __spi_validate()
4156 if ((xfer->rx_nbits == SPI_NBITS_DUAL) && in __spi_validate()
4157 !(spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD))) in __spi_validate()
4158 return -EINVAL; in __spi_validate()
4159 if ((xfer->rx_nbits == SPI_NBITS_QUAD) && in __spi_validate()
4160 !(spi->mode & SPI_RX_QUAD)) in __spi_validate()
4161 return -EINVAL; in __spi_validate()
4164 if (_spi_xfer_word_delay_update(xfer, spi)) in __spi_validate()
4165 return -EINVAL; in __spi_validate()
4168 if (xfer->offload_flags) { in __spi_validate()
4169 if (!message->offload) in __spi_validate()
4170 return -EINVAL; in __spi_validate()
4172 if (xfer->offload_flags & ~message->offload->xfer_flags) in __spi_validate()
4173 return -EINVAL; in __spi_validate()
4177 message->status = -EINPROGRESS; in __spi_validate()
4183 * spi_split_transfers - generic handling of transfer splitting
4186 * Under certain conditions, a SPI controller may not support arbitrary
4199 struct spi_controller *ctlr = msg->spi->controller; in spi_split_transfers()
4204 * If an SPI controller does not support toggling the CS line on each in spi_split_transfers()
4206 * for the CS line, we can emulate the CS-per-word hardware function by in spi_split_transfers()
4207 * splitting transfers into one-word transfers and ensuring that in spi_split_transfers()
4210 if ((msg->spi->mode & SPI_CS_WORD) && in spi_split_transfers()
4211 (!(ctlr->mode_bits & SPI_CS_WORD) || spi_is_csgpiod(msg->spi))) { in spi_split_transfers()
4216 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_split_transfers()
4218 if (list_is_last(&xfer->transfer_list, &msg->transfers)) in spi_split_transfers()
4221 xfer->cs_change = 1; in spi_split_transfers()
4225 spi_max_transfer_size(msg->spi)); in spi_split_transfers()
4234 * __spi_optimize_message - shared implementation for spi_optimize_message()
4236 * @spi: the device that will be used for the message
4239 * Peripheral drivers will call spi_optimize_message() and the spi core will
4246 static int __spi_optimize_message(struct spi_device *spi, in __spi_optimize_message() argument
4249 struct spi_controller *ctlr = spi->controller; in __spi_optimize_message()
4252 ret = __spi_validate(spi, msg); in __spi_optimize_message()
4260 if (ctlr->optimize_message) { in __spi_optimize_message()
4261 ret = ctlr->optimize_message(msg); in __spi_optimize_message()
4268 msg->optimized = true; in __spi_optimize_message()
4274 * spi_maybe_optimize_message - optimize message if it isn't already pre-optimized
4275 * @spi: the device that will be used for the message
4279 static int spi_maybe_optimize_message(struct spi_device *spi, in spi_maybe_optimize_message() argument
4282 if (spi->controller->defer_optimize_message) { in spi_maybe_optimize_message()
4283 msg->spi = spi; in spi_maybe_optimize_message()
4287 if (msg->pre_optimized) in spi_maybe_optimize_message()
4290 return __spi_optimize_message(spi, msg); in spi_maybe_optimize_message()
4294 * spi_optimize_message - do any one-time validation and setup for a SPI message
4295 * @spi: the device that will be used for the message
4304 * of updating the contents of any xfer->tx_buf (the pointer can't be changed,
4313 int spi_optimize_message(struct spi_device *spi, struct spi_message *msg) in spi_optimize_message() argument
4318 * Pre-optimization is not supported and optimization is deferred e.g. in spi_optimize_message()
4319 * when using spi-mux. in spi_optimize_message()
4321 if (spi->controller->defer_optimize_message) in spi_optimize_message()
4324 ret = __spi_optimize_message(spi, msg); in spi_optimize_message()
4334 msg->pre_optimized = true; in spi_optimize_message()
4341 * spi_unoptimize_message - releases any resources allocated by spi_optimize_message()
4350 if (msg->spi->controller->defer_optimize_message) in spi_unoptimize_message()
4354 msg->pre_optimized = false; in spi_unoptimize_message()
4358 static int __spi_async(struct spi_device *spi, struct spi_message *message) in __spi_async() argument
4360 struct spi_controller *ctlr = spi->controller; in __spi_async()
4364 * Some controllers do not support doing regular SPI transfers. Return in __spi_async()
4367 if (!ctlr->transfer) in __spi_async()
4368 return -ENOTSUPP; in __spi_async()
4370 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_async); in __spi_async()
4371 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_async); in __spi_async()
4375 if (!ctlr->ptp_sts_supported) { in __spi_async()
4376 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_async()
4377 xfer->ptp_sts_word_pre = 0; in __spi_async()
4378 ptp_read_system_prets(xfer->ptp_sts); in __spi_async()
4382 return ctlr->transfer(spi, message); in __spi_async()
4391 * devm_spi_optimize_message - managed version of spi_optimize_message()
4392 * @dev: the device that manages @msg (usually @spi->dev)
4393 * @spi: the device that will be used for the message
4400 int devm_spi_optimize_message(struct device *dev, struct spi_device *spi, in devm_spi_optimize_message() argument
4405 ret = spi_optimize_message(spi, msg); in devm_spi_optimize_message()
4414 * spi_async - asynchronous SPI transfer
4415 * @spi: device with which data will be exchanged
4423 * Before that invocation, the value of message->status is undefined.
4424 * When the callback is issued, message->status holds either zero (to
4427 * deallocate the associated memory; it's no longer in use by any SPI
4444 int spi_async(struct spi_device *spi, struct spi_message *message) in spi_async() argument
4446 struct spi_controller *ctlr = spi->controller; in spi_async()
4450 ret = spi_maybe_optimize_message(spi, message); in spi_async()
4454 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in spi_async()
4456 if (ctlr->bus_lock_flag) in spi_async()
4457 ret = -EBUSY; in spi_async()
4459 ret = __spi_async(spi, message); in spi_async()
4461 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in spi_async()
4472 mutex_lock(&ctlr->io_mutex); in __spi_transfer_message_noqueue()
4474 was_busy = ctlr->busy; in __spi_transfer_message_noqueue()
4476 ctlr->cur_msg = msg; in __spi_transfer_message_noqueue()
4479 dev_err(&ctlr->dev, "noqueue transfer failed\n"); in __spi_transfer_message_noqueue()
4480 ctlr->cur_msg = NULL; in __spi_transfer_message_noqueue()
4481 ctlr->fallback = false; in __spi_transfer_message_noqueue()
4484 kfree(ctlr->dummy_rx); in __spi_transfer_message_noqueue()
4485 ctlr->dummy_rx = NULL; in __spi_transfer_message_noqueue()
4486 kfree(ctlr->dummy_tx); in __spi_transfer_message_noqueue()
4487 ctlr->dummy_tx = NULL; in __spi_transfer_message_noqueue()
4488 if (ctlr->unprepare_transfer_hardware && in __spi_transfer_message_noqueue()
4489 ctlr->unprepare_transfer_hardware(ctlr)) in __spi_transfer_message_noqueue()
4490 dev_err(&ctlr->dev, in __spi_transfer_message_noqueue()
4495 mutex_unlock(&ctlr->io_mutex); in __spi_transfer_message_noqueue()
4498 /*-------------------------------------------------------------------------*/
4501 * Utility methods for SPI protocol drivers, layered on
4511 static int __spi_sync(struct spi_device *spi, struct spi_message *message) in __spi_sync() argument
4516 struct spi_controller *ctlr = spi->controller; in __spi_sync()
4519 dev_warn_once(&spi->dev, "Attempted to sync while suspend\n"); in __spi_sync()
4520 return -ESHUTDOWN; in __spi_sync()
4523 status = spi_maybe_optimize_message(spi, message); in __spi_sync()
4527 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_sync); in __spi_sync()
4528 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_sync); in __spi_sync()
4536 if (READ_ONCE(ctlr->queue_empty) && !ctlr->must_async) { in __spi_sync()
4537 message->actual_length = 0; in __spi_sync()
4538 message->status = -EINPROGRESS; in __spi_sync()
4542 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_sync_immediate); in __spi_sync()
4543 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_sync_immediate); in __spi_sync()
4547 return message->status; in __spi_sync()
4556 message->complete = spi_complete; in __spi_sync()
4557 message->context = &done; in __spi_sync()
4559 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in __spi_sync()
4560 status = __spi_async(spi, message); in __spi_sync()
4561 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in __spi_sync()
4565 status = message->status; in __spi_sync()
4567 message->complete = NULL; in __spi_sync()
4568 message->context = NULL; in __spi_sync()
4574 * spi_sync - blocking/synchronous SPI data transfers
4575 * @spi: device with which data will be exchanged
4580 * is non-interruptible, and has no timeout. Low-overhead controller
4583 * Note that the SPI device's chip select is active during the message,
4585 * frequently-used devices may want to minimize costs of selecting a chip,
4594 int spi_sync(struct spi_device *spi, struct spi_message *message) in spi_sync() argument
4598 mutex_lock(&spi->controller->bus_lock_mutex); in spi_sync()
4599 ret = __spi_sync(spi, message); in spi_sync()
4600 mutex_unlock(&spi->controller->bus_lock_mutex); in spi_sync()
4607 * spi_sync_locked - version of spi_sync with exclusive bus usage
4608 * @spi: device with which data will be exchanged
4613 * is non-interruptible, and has no timeout. Low-overhead controller
4617 * SPI bus. It has to be preceded by a spi_bus_lock call. The SPI bus must
4622 int spi_sync_locked(struct spi_device *spi, struct spi_message *message) in spi_sync_locked() argument
4624 return __spi_sync(spi, message); in spi_sync_locked()
4629 * spi_bus_lock - obtain a lock for exclusive SPI bus usage
4630 * @ctlr: SPI bus controller that should be locked for exclusive bus access
4634 * is non-interruptible, and has no timeout.
4637 * SPI bus. The SPI bus must be released by a spi_bus_unlock call when the
4639 * and spi_async_locked calls when the SPI bus lock is held.
4647 mutex_lock(&ctlr->bus_lock_mutex); in spi_bus_lock()
4649 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in spi_bus_lock()
4650 ctlr->bus_lock_flag = 1; in spi_bus_lock()
4651 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in spi_bus_lock()
4660 * spi_bus_unlock - release the lock for exclusive SPI bus usage
4661 * @ctlr: SPI bus controller that was locked for exclusive bus access
4665 * is non-interruptible, and has no timeout.
4667 * This call releases an SPI bus lock previously obtained by an spi_bus_lock
4674 ctlr->bus_lock_flag = 0; in spi_bus_unlock()
4676 mutex_unlock(&ctlr->bus_lock_mutex); in spi_bus_unlock()
4688 * spi_write_then_read - SPI synchronous write followed by read
4689 * @spi: device with which data will be exchanged
4690 * @txbuf: data to be written (need not be DMA-safe)
4692 * @rxbuf: buffer into which data will be read (need not be DMA-safe)
4702 * Performance-sensitive or bulk transfer code should instead use
4703 * spi_{async,sync}() calls with DMA-safe buffers.
4707 int spi_write_then_read(struct spi_device *spi, in spi_write_then_read() argument
4719 * Use preallocated DMA-safe buffer if we can. We can't avoid in spi_write_then_read()
4722 * using the pre-allocated buffer or the transfer is too large. in spi_write_then_read()
4728 return -ENOMEM; in spi_write_then_read()
4749 status = spi_sync(spi, &message); in spi_write_then_read()
4762 /*-------------------------------------------------------------------------*/
4773 /* The spi controllers are not using spi_bus, so we find it with another way */
4793 struct spi_device *spi; in of_spi_notify() local
4797 ctlr = of_find_spi_controller_by_node(rd->dn->parent); in of_spi_notify()
4801 if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) { in of_spi_notify()
4802 put_device(&ctlr->dev); in of_spi_notify()
4810 rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE; in of_spi_notify()
4811 spi = of_register_spi_device(ctlr, rd->dn); in of_spi_notify()
4812 put_device(&ctlr->dev); in of_spi_notify()
4814 if (IS_ERR(spi)) { in of_spi_notify()
4816 __func__, rd->dn); in of_spi_notify()
4817 of_node_clear_flag(rd->dn, OF_POPULATED); in of_spi_notify()
4818 return notifier_from_errno(PTR_ERR(spi)); in of_spi_notify()
4824 if (!of_node_check_flag(rd->dn, OF_POPULATED)) in of_spi_notify()
4828 spi = of_find_spi_device_by_node(rd->dn); in of_spi_notify()
4829 if (spi == NULL) in of_spi_notify()
4833 spi_unregister_device(spi); in of_spi_notify()
4836 put_device(&spi->dev); in of_spi_notify()
4853 return device_match_acpi_dev(dev->parent, data); in spi_acpi_controller_match()
4885 struct spi_device *spi; in acpi_spi_notify() local
4894 put_device(&ctlr->dev); in acpi_spi_notify()
4900 spi = acpi_spi_find_device_by_adev(adev); in acpi_spi_notify()
4901 if (!spi) in acpi_spi_notify()
4904 spi_unregister_device(spi); in acpi_spi_notify()
4905 put_device(&spi->dev); in acpi_spi_notify()
4925 status = -ENOMEM; in spi_init()