Lines Matching +full:coexist +full:- +full:gpio +full:- +full:pin
1 // SPDX-License-Identifier: GPL-2.0-or-later
9 #include <linux/clk/clk-conf.h>
13 #include <linux/dma-mapping.h>
15 #include <linux/gpio/consumer.h>
35 #include <linux/spi/spi-mem.h>
51 spi_controller_put(spi->controller); in spidev_release()
52 kfree(spi->driver_override); in spidev_release()
53 free_percpu(spi->pcpu_statistics); in spidev_release()
63 len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1); in modalias_show()
64 if (len != -ENODEV) in modalias_show()
67 return sysfs_emit(buf, "%s%s\n", SPI_MODULE_PREFIX, spi->modalias); in modalias_show()
78 ret = driver_set_override(dev, &spi->driver_override, buf, count); in driver_override_store()
92 len = sysfs_emit(buf, "%s\n", spi->driver_override ? : ""); in driver_override_show()
114 u64_stats_init(&stat->syncp); in spi_alloc_pcpu_stats()
135 start = u64_stats_fetch_begin(&pcpu_stats->syncp); in spi_emit_pcpu_stats()
137 } while (u64_stats_fetch_retry(&pcpu_stats->syncp, start)); in spi_emit_pcpu_stats()
150 return spi_statistics_##field##_show(ctlr->pcpu_statistics, buf); \
161 return spi_statistics_##field##_show(spi->pcpu_statistics, buf); \
198 SPI_STATISTICS_TRANSFER_BYTES_HISTO(0, "0-1");
199 SPI_STATISTICS_TRANSFER_BYTES_HISTO(1, "2-3");
200 SPI_STATISTICS_TRANSFER_BYTES_HISTO(2, "4-7");
201 SPI_STATISTICS_TRANSFER_BYTES_HISTO(3, "8-15");
202 SPI_STATISTICS_TRANSFER_BYTES_HISTO(4, "16-31");
203 SPI_STATISTICS_TRANSFER_BYTES_HISTO(5, "32-63");
204 SPI_STATISTICS_TRANSFER_BYTES_HISTO(6, "64-127");
205 SPI_STATISTICS_TRANSFER_BYTES_HISTO(7, "128-255");
206 SPI_STATISTICS_TRANSFER_BYTES_HISTO(8, "256-511");
207 SPI_STATISTICS_TRANSFER_BYTES_HISTO(9, "512-1023");
208 SPI_STATISTICS_TRANSFER_BYTES_HISTO(10, "1024-2047");
209 SPI_STATISTICS_TRANSFER_BYTES_HISTO(11, "2048-4095");
210 SPI_STATISTICS_TRANSFER_BYTES_HISTO(12, "4096-8191");
211 SPI_STATISTICS_TRANSFER_BYTES_HISTO(13, "8192-16383");
212 SPI_STATISTICS_TRANSFER_BYTES_HISTO(14, "16384-32767");
213 SPI_STATISTICS_TRANSFER_BYTES_HISTO(15, "32768-65535");
317 int l2len = min(fls(xfer->len), SPI_STATISTICS_HISTO_SIZE) - 1; in spi_statistics_add_transfer_stats()
325 u64_stats_update_begin(&stats->syncp); in spi_statistics_add_transfer_stats()
327 u64_stats_inc(&stats->transfers); in spi_statistics_add_transfer_stats()
328 u64_stats_inc(&stats->transfer_bytes_histo[l2len]); in spi_statistics_add_transfer_stats()
330 u64_stats_add(&stats->bytes, xfer->len); in spi_statistics_add_transfer_stats()
331 if ((xfer->tx_buf) && in spi_statistics_add_transfer_stats()
332 (xfer->tx_buf != ctlr->dummy_tx)) in spi_statistics_add_transfer_stats()
333 u64_stats_add(&stats->bytes_tx, xfer->len); in spi_statistics_add_transfer_stats()
334 if ((xfer->rx_buf) && in spi_statistics_add_transfer_stats()
335 (xfer->rx_buf != ctlr->dummy_rx)) in spi_statistics_add_transfer_stats()
336 u64_stats_add(&stats->bytes_rx, xfer->len); in spi_statistics_add_transfer_stats()
338 u64_stats_update_end(&stats->syncp); in spi_statistics_add_transfer_stats()
343 * modalias support makes "modprobe $MODALIAS" new-style hotplug work,
348 while (id->name[0]) { in spi_match_id()
349 if (!strcmp(name, id->name)) in spi_match_id()
358 const struct spi_driver *sdrv = to_spi_driver(sdev->dev.driver); in spi_get_device_id()
360 return spi_match_id(sdrv->id_table, sdev->modalias); in spi_get_device_id()
368 match = device_get_match_data(&sdev->dev); in spi_get_device_match_data()
372 return (const void *)spi_get_device_id(sdev)->driver_data; in spi_get_device_match_data()
382 if (spi->driver_override) in spi_match_device()
383 return strcmp(spi->driver_override, drv->name) == 0; in spi_match_device()
393 if (sdrv->id_table) in spi_match_device()
394 return !!spi_match_id(sdrv->id_table, spi->modalias); in spi_match_device()
396 return strcmp(spi->modalias, drv->name) == 0; in spi_match_device()
405 if (rc != -ENODEV) in spi_uevent()
408 return add_uevent_var(env, "MODALIAS=%s%s", SPI_MODULE_PREFIX, spi->modalias); in spi_uevent()
413 const struct spi_driver *sdrv = to_spi_driver(dev->driver); in spi_probe()
417 ret = of_clk_set_defaults(dev->of_node, false); in spi_probe()
421 if (dev->of_node) { in spi_probe()
422 spi->irq = of_irq_get(dev->of_node, 0); in spi_probe()
423 if (spi->irq == -EPROBE_DEFER) in spi_probe()
424 return -EPROBE_DEFER; in spi_probe()
425 if (spi->irq < 0) in spi_probe()
426 spi->irq = 0; in spi_probe()
433 if (sdrv->probe) { in spi_probe()
434 ret = sdrv->probe(spi); in spi_probe()
444 const struct spi_driver *sdrv = to_spi_driver(dev->driver); in spi_remove()
446 if (sdrv->remove) in spi_remove()
447 sdrv->remove(to_spi_device(dev)); in spi_remove()
454 if (dev->driver) { in spi_shutdown()
455 const struct spi_driver *sdrv = to_spi_driver(dev->driver); in spi_shutdown()
457 if (sdrv->shutdown) in spi_shutdown()
458 sdrv->shutdown(to_spi_device(dev)); in spi_shutdown()
474 * __spi_register_driver - register a SPI driver
483 sdrv->driver.owner = owner; in __spi_register_driver()
484 sdrv->driver.bus = &spi_bus_type; in __spi_register_driver()
491 if (sdrv->driver.of_match_table) { in __spi_register_driver()
494 for (of_id = sdrv->driver.of_match_table; of_id->compatible[0]; in __spi_register_driver()
499 of_name = strnchr(of_id->compatible, in __spi_register_driver()
500 sizeof(of_id->compatible), ','); in __spi_register_driver()
504 of_name = of_id->compatible; in __spi_register_driver()
506 if (sdrv->id_table) { in __spi_register_driver()
509 spi_id = spi_match_id(sdrv->id_table, of_name); in __spi_register_driver()
513 if (strcmp(sdrv->driver.name, of_name) == 0) in __spi_register_driver()
518 sdrv->driver.name, of_id->compatible); in __spi_register_driver()
522 return driver_register(&sdrv->driver); in __spi_register_driver()
526 /*-------------------------------------------------------------------------*/
530 * would make them board-specific. Similarly with SPI controller drivers.
531 * Device registration normally goes into like arch/.../mach.../board-YYY.c
551 * spi_alloc_device - Allocate a new SPI device
580 spi->pcpu_statistics = spi_alloc_pcpu_stats(NULL); in spi_alloc_device()
581 if (!spi->pcpu_statistics) { in spi_alloc_device()
587 spi->master = spi->controller = ctlr; in spi_alloc_device()
588 spi->dev.parent = &ctlr->dev; in spi_alloc_device()
589 spi->dev.bus = &spi_bus_type; in spi_alloc_device()
590 spi->dev.release = spidev_release; in spi_alloc_device()
591 spi->mode = ctlr->buswidth_override_bits; in spi_alloc_device()
593 device_initialize(&spi->dev); in spi_alloc_device()
600 struct acpi_device *adev = ACPI_COMPANION(&spi->dev); in spi_dev_set_name()
603 dev_set_name(&spi->dev, "spi-%s", acpi_dev_name(adev)); in spi_dev_set_name()
607 dev_set_name(&spi->dev, "%s.%u", dev_name(&spi->controller->dev), in spi_dev_set_name()
616 if (spi->controller == new_spi->controller && in spi_dev_check()
618 return -EBUSY; in spi_dev_check()
624 if (spi->controller->cleanup) in spi_cleanup()
625 spi->controller->cleanup(spi); in spi_cleanup()
630 struct spi_controller *ctlr = spi->controller; in __spi_add_device()
631 struct device *dev = ctlr->dev.parent; in __spi_add_device()
635 if (spi_get_chipselect(spi, 0) >= ctlr->num_chipselect) { in __spi_add_device()
637 ctlr->num_chipselect); in __spi_add_device()
638 return -EINVAL; in __spi_add_device()
658 !device_is_registered(&ctlr->dev)) { in __spi_add_device()
659 return -ENODEV; in __spi_add_device()
662 if (ctlr->cs_gpiods) in __spi_add_device()
663 spi_set_csgpiod(spi, 0, ctlr->cs_gpiods[spi_get_chipselect(spi, 0)]); in __spi_add_device()
668 * using SPI_CS_HIGH can't coexist well otherwise... in __spi_add_device()
673 dev_name(&spi->dev), status); in __spi_add_device()
678 status = device_add(&spi->dev); in __spi_add_device()
681 dev_name(&spi->dev), status); in __spi_add_device()
684 dev_dbg(dev, "registered child %s\n", dev_name(&spi->dev)); in __spi_add_device()
691 * spi_add_device - Add spi_device allocated with spi_alloc_device
701 struct spi_controller *ctlr = spi->controller; in spi_add_device()
704 mutex_lock(&ctlr->add_lock); in spi_add_device()
706 mutex_unlock(&ctlr->add_lock); in spi_add_device()
712 * spi_new_device - instantiate one new SPI device
718 * after board init creates the hard-wired devices. Some development
721 * driver could add devices (which it would learn about out-of-band).
732 * NOTE: caller did any chip->bus_num checks necessary. in spi_new_device()
735 * error-or-pointer (not NULL-or-pointer), troubleshootability in spi_new_device()
743 WARN_ON(strlen(chip->modalias) >= sizeof(proxy->modalias)); in spi_new_device()
745 spi_set_chipselect(proxy, 0, chip->chip_select); in spi_new_device()
746 proxy->max_speed_hz = chip->max_speed_hz; in spi_new_device()
747 proxy->mode = chip->mode; in spi_new_device()
748 proxy->irq = chip->irq; in spi_new_device()
749 strscpy(proxy->modalias, chip->modalias, sizeof(proxy->modalias)); in spi_new_device()
750 proxy->dev.platform_data = (void *) chip->platform_data; in spi_new_device()
751 proxy->controller_data = chip->controller_data; in spi_new_device()
752 proxy->controller_state = NULL; in spi_new_device()
754 if (chip->swnode) { in spi_new_device()
755 status = device_add_software_node(&proxy->dev, chip->swnode); in spi_new_device()
757 dev_err(&ctlr->dev, "failed to add software node to '%s': %d\n", in spi_new_device()
758 chip->modalias, status); in spi_new_device()
770 device_remove_software_node(&proxy->dev); in spi_new_device()
777 * spi_unregister_device - unregister a single SPI device
788 if (spi->dev.of_node) { in spi_unregister_device()
789 of_node_clear_flag(spi->dev.of_node, OF_POPULATED); in spi_unregister_device()
790 of_node_put(spi->dev.of_node); in spi_unregister_device()
792 if (ACPI_COMPANION(&spi->dev)) in spi_unregister_device()
793 acpi_device_clear_enumerated(ACPI_COMPANION(&spi->dev)); in spi_unregister_device()
794 device_remove_software_node(&spi->dev); in spi_unregister_device()
795 device_del(&spi->dev); in spi_unregister_device()
797 put_device(&spi->dev); in spi_unregister_device()
806 if (ctlr->bus_num != bi->bus_num) in spi_match_controller_to_boardinfo()
811 dev_err(ctlr->dev.parent, "can't create new device for %s\n", in spi_match_controller_to_boardinfo()
812 bi->modalias); in spi_match_controller_to_boardinfo()
816 * spi_register_board_info - register SPI devices for a given board
821 * Board-specific early init code calls this (probably during arch_initcall)
825 * not make Linux forget about these hard-wired devices.
827 * Other code can also call this, e.g. a particular add-on board might provide
832 * any embedded pointers (platform_data, etc), they're copied as-is.
846 return -ENOMEM; in spi_register_board_info()
851 memcpy(&bi->board_info, info, sizeof(*info)); in spi_register_board_info()
854 list_add_tail(&bi->list, &board_list); in spi_register_board_info()
857 &bi->board_info); in spi_register_board_info()
864 /*-------------------------------------------------------------------------*/
869 * spi_res_alloc - allocate a spi resource that is life-cycle managed
891 INIT_LIST_HEAD(&sres->entry); in spi_res_alloc()
892 sres->release = release; in spi_res_alloc()
894 return sres->data; in spi_res_alloc()
898 * spi_res_free - free an SPI resource
908 WARN_ON(!list_empty(&sres->entry)); in spi_res_free()
913 * spi_res_add - add a spi_res to the spi_message
921 WARN_ON(!list_empty(&sres->entry)); in spi_res_add()
922 list_add_tail(&sres->entry, &message->resources); in spi_res_add()
926 * spi_res_release - release all SPI resources for this message
934 list_for_each_entry_safe_reverse(res, tmp, &message->resources, entry) { in spi_res_release()
935 if (res->release) in spi_res_release()
936 res->release(ctlr, message, res->data); in spi_res_release()
938 list_del(&res->entry); in spi_res_release()
944 /*-------------------------------------------------------------------------*/
954 if (!force && ((enable && spi->controller->last_cs == spi_get_chipselect(spi, 0)) || in spi_set_cs()
955 (!enable && spi->controller->last_cs != spi_get_chipselect(spi, 0))) && in spi_set_cs()
956 (spi->controller->last_cs_mode_high == (spi->mode & SPI_CS_HIGH))) in spi_set_cs()
961 spi->controller->last_cs = enable ? spi_get_chipselect(spi, 0) : -1; in spi_set_cs()
962 spi->controller->last_cs_mode_high = spi->mode & SPI_CS_HIGH; in spi_set_cs()
964 if ((spi_get_csgpiod(spi, 0) || !spi->controller->set_cs_timing) && !activate) in spi_set_cs()
965 spi_delay_exec(&spi->cs_hold, NULL); in spi_set_cs()
967 if (spi->mode & SPI_CS_HIGH) in spi_set_cs()
971 if (!(spi->mode & SPI_NO_CS)) { in spi_set_cs()
973 * Historically ACPI has no means of the GPIO polarity and in spi_set_cs()
974 * thus the SPISerialBus() resource defines it on the per-chip in spi_set_cs()
975 * basis. In order to avoid a chain of negations, the GPIO in spi_set_cs()
978 * the GPIO CS polarity must be defined Active High to avoid in spi_set_cs()
982 if (has_acpi_companion(&spi->dev)) in spi_set_cs()
985 /* Polarity handled by GPIO library */ in spi_set_cs()
988 /* Some SPI masters need both GPIO CS & slave_select */ in spi_set_cs()
989 if ((spi->controller->flags & SPI_CONTROLLER_GPIO_SS) && in spi_set_cs()
990 spi->controller->set_cs) in spi_set_cs()
991 spi->controller->set_cs(spi, !enable); in spi_set_cs()
992 } else if (spi->controller->set_cs) { in spi_set_cs()
993 spi->controller->set_cs(spi, !enable); in spi_set_cs()
996 if (spi_get_csgpiod(spi, 0) || !spi->controller->set_cs_timing) { in spi_set_cs()
998 spi_delay_exec(&spi->cs_setup, NULL); in spi_set_cs()
1000 spi_delay_exec(&spi->cs_inactive, NULL); in spi_set_cs()
1030 desc_len = min_t(size_t, max_seg_size, ctlr->max_dma_len); in spi_map_buf_attrs()
1033 return -EINVAL; in spi_map_buf_attrs()
1040 sg = &sgt->sgl[0]; in spi_map_buf_attrs()
1051 PAGE_SIZE - offset_in_page(buf))); in spi_map_buf_attrs()
1058 return -ENOMEM; in spi_map_buf_attrs()
1069 len -= min; in spi_map_buf_attrs()
1094 if (sgt->orig_nents) { in spi_unmap_buf_attrs()
1097 sgt->orig_nents = 0; in spi_unmap_buf_attrs()
1098 sgt->nents = 0; in spi_unmap_buf_attrs()
1114 if (!ctlr->can_dma) in __spi_map_msg()
1117 if (ctlr->dma_tx) in __spi_map_msg()
1118 tx_dev = ctlr->dma_tx->device->dev; in __spi_map_msg()
1119 else if (ctlr->dma_map_dev) in __spi_map_msg()
1120 tx_dev = ctlr->dma_map_dev; in __spi_map_msg()
1122 tx_dev = ctlr->dev.parent; in __spi_map_msg()
1124 if (ctlr->dma_rx) in __spi_map_msg()
1125 rx_dev = ctlr->dma_rx->device->dev; in __spi_map_msg()
1126 else if (ctlr->dma_map_dev) in __spi_map_msg()
1127 rx_dev = ctlr->dma_map_dev; in __spi_map_msg()
1129 rx_dev = ctlr->dev.parent; in __spi_map_msg()
1131 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_map_msg()
1135 if (!ctlr->can_dma(ctlr, msg->spi, xfer)) in __spi_map_msg()
1138 if (xfer->tx_buf != NULL) { in __spi_map_msg()
1139 ret = spi_map_buf_attrs(ctlr, tx_dev, &xfer->tx_sg, in __spi_map_msg()
1140 (void *)xfer->tx_buf, in __spi_map_msg()
1141 xfer->len, DMA_TO_DEVICE, in __spi_map_msg()
1147 if (xfer->rx_buf != NULL) { in __spi_map_msg()
1148 ret = spi_map_buf_attrs(ctlr, rx_dev, &xfer->rx_sg, in __spi_map_msg()
1149 xfer->rx_buf, xfer->len, in __spi_map_msg()
1153 &xfer->tx_sg, DMA_TO_DEVICE, in __spi_map_msg()
1161 ctlr->cur_rx_dma_dev = rx_dev; in __spi_map_msg()
1162 ctlr->cur_tx_dma_dev = tx_dev; in __spi_map_msg()
1163 ctlr->cur_msg_mapped = true; in __spi_map_msg()
1170 struct device *rx_dev = ctlr->cur_rx_dma_dev; in __spi_unmap_msg()
1171 struct device *tx_dev = ctlr->cur_tx_dma_dev; in __spi_unmap_msg()
1174 if (!ctlr->cur_msg_mapped || !ctlr->can_dma) in __spi_unmap_msg()
1177 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_unmap_msg()
1181 if (!ctlr->can_dma(ctlr, msg->spi, xfer)) in __spi_unmap_msg()
1184 spi_unmap_buf_attrs(ctlr, rx_dev, &xfer->rx_sg, in __spi_unmap_msg()
1186 spi_unmap_buf_attrs(ctlr, tx_dev, &xfer->tx_sg, in __spi_unmap_msg()
1190 ctlr->cur_msg_mapped = false; in __spi_unmap_msg()
1198 struct device *rx_dev = ctlr->cur_rx_dma_dev; in spi_dma_sync_for_device()
1199 struct device *tx_dev = ctlr->cur_tx_dma_dev; in spi_dma_sync_for_device()
1201 if (!ctlr->cur_msg_mapped) in spi_dma_sync_for_device()
1204 if (xfer->tx_sg.orig_nents) in spi_dma_sync_for_device()
1205 dma_sync_sgtable_for_device(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE); in spi_dma_sync_for_device()
1206 if (xfer->rx_sg.orig_nents) in spi_dma_sync_for_device()
1207 dma_sync_sgtable_for_device(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE); in spi_dma_sync_for_device()
1213 struct device *rx_dev = ctlr->cur_rx_dma_dev; in spi_dma_sync_for_cpu()
1214 struct device *tx_dev = ctlr->cur_tx_dma_dev; in spi_dma_sync_for_cpu()
1216 if (!ctlr->cur_msg_mapped) in spi_dma_sync_for_cpu()
1219 if (xfer->rx_sg.orig_nents) in spi_dma_sync_for_cpu()
1220 dma_sync_sgtable_for_cpu(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE); in spi_dma_sync_for_cpu()
1221 if (xfer->tx_sg.orig_nents) in spi_dma_sync_for_cpu()
1222 dma_sync_sgtable_for_cpu(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE); in spi_dma_sync_for_cpu()
1253 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_unmap_msg()
1258 if (xfer->tx_buf == ctlr->dummy_tx) in spi_unmap_msg()
1259 xfer->tx_buf = NULL; in spi_unmap_msg()
1260 if (xfer->rx_buf == ctlr->dummy_rx) in spi_unmap_msg()
1261 xfer->rx_buf = NULL; in spi_unmap_msg()
1273 if ((ctlr->flags & (SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX)) in spi_map_msg()
1274 && !(msg->spi->mode & SPI_3WIRE)) { in spi_map_msg()
1278 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_map_msg()
1279 if ((ctlr->flags & SPI_CONTROLLER_MUST_TX) && in spi_map_msg()
1280 !xfer->tx_buf) in spi_map_msg()
1281 max_tx = max(xfer->len, max_tx); in spi_map_msg()
1282 if ((ctlr->flags & SPI_CONTROLLER_MUST_RX) && in spi_map_msg()
1283 !xfer->rx_buf) in spi_map_msg()
1284 max_rx = max(xfer->len, max_rx); in spi_map_msg()
1288 tmp = krealloc(ctlr->dummy_tx, max_tx, in spi_map_msg()
1291 return -ENOMEM; in spi_map_msg()
1292 ctlr->dummy_tx = tmp; in spi_map_msg()
1296 tmp = krealloc(ctlr->dummy_rx, max_rx, in spi_map_msg()
1299 return -ENOMEM; in spi_map_msg()
1300 ctlr->dummy_rx = tmp; in spi_map_msg()
1304 list_for_each_entry(xfer, &msg->transfers, in spi_map_msg()
1306 if (!xfer->len) in spi_map_msg()
1308 if (!xfer->tx_buf) in spi_map_msg()
1309 xfer->tx_buf = ctlr->dummy_tx; in spi_map_msg()
1310 if (!xfer->rx_buf) in spi_map_msg()
1311 xfer->rx_buf = ctlr->dummy_rx; in spi_map_msg()
1323 struct spi_statistics __percpu *statm = ctlr->pcpu_statistics; in spi_transfer_wait()
1324 struct spi_statistics __percpu *stats = msg->spi->pcpu_statistics; in spi_transfer_wait()
1325 u32 speed_hz = xfer->speed_hz; in spi_transfer_wait()
1329 if (wait_for_completion_interruptible(&ctlr->xfer_completion)) { in spi_transfer_wait()
1330 dev_dbg(&msg->spi->dev, "SPI transfer interrupted\n"); in spi_transfer_wait()
1331 return -EINTR; in spi_transfer_wait()
1343 ms = 8LL * MSEC_PER_SEC * xfer->len; in spi_transfer_wait()
1354 ms = wait_for_completion_timeout(&ctlr->xfer_completion, in spi_transfer_wait()
1360 dev_err(&msg->spi->dev, in spi_transfer_wait()
1362 return -ETIMEDOUT; in spi_transfer_wait()
1387 u32 delay = _delay->value; in spi_delay_to_ns()
1388 u32 unit = _delay->unit; in spi_delay_to_ns()
1404 return -EINVAL; in spi_delay_to_ns()
1409 hz = xfer->effective_speed_hz ?: xfer->speed_hz / 2; in spi_delay_to_ns()
1411 return -EINVAL; in spi_delay_to_ns()
1417 return -EINVAL; in spi_delay_to_ns()
1431 return -EINVAL; in spi_delay_exec()
1447 u32 delay = xfer->cs_change_delay.value; in _spi_transfer_cs_change_delay()
1448 u32 unit = xfer->cs_change_delay.unit; in _spi_transfer_cs_change_delay()
1451 /* Return early on "fast" mode - for everything but USECS */ in _spi_transfer_cs_change_delay()
1458 ret = spi_delay_exec(&xfer->cs_change_delay, xfer); in _spi_transfer_cs_change_delay()
1460 dev_err_once(&msg->spi->dev, in _spi_transfer_cs_change_delay()
1475 * spi_transfer_one_message - Default implementation of transfer_one_message()
1487 struct spi_statistics __percpu *statm = ctlr->pcpu_statistics; in spi_transfer_one_message()
1488 struct spi_statistics __percpu *stats = msg->spi->pcpu_statistics; in spi_transfer_one_message()
1490 xfer = list_first_entry(&msg->transfers, struct spi_transfer, transfer_list); in spi_transfer_one_message()
1491 spi_set_cs(msg->spi, !xfer->cs_off, false); in spi_transfer_one_message()
1496 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_transfer_one_message()
1502 if (!ctlr->ptp_sts_supported) { in spi_transfer_one_message()
1503 xfer->ptp_sts_word_pre = 0; in spi_transfer_one_message()
1504 ptp_read_system_prets(xfer->ptp_sts); in spi_transfer_one_message()
1507 if ((xfer->tx_buf || xfer->rx_buf) && xfer->len) { in spi_transfer_one_message()
1508 reinit_completion(&ctlr->xfer_completion); in spi_transfer_one_message()
1512 ret = ctlr->transfer_one(ctlr, msg->spi, xfer); in spi_transfer_one_message()
1516 if (ctlr->cur_msg_mapped && in spi_transfer_one_message()
1517 (xfer->error & SPI_TRANS_FAIL_NO_START)) { in spi_transfer_one_message()
1519 ctlr->fallback = true; in spi_transfer_one_message()
1520 xfer->error &= ~SPI_TRANS_FAIL_NO_START; in spi_transfer_one_message()
1528 dev_err(&msg->spi->dev, in spi_transfer_one_message()
1536 msg->status = ret; in spi_transfer_one_message()
1541 if (xfer->len) in spi_transfer_one_message()
1542 dev_err(&msg->spi->dev, in spi_transfer_one_message()
1544 xfer->len); in spi_transfer_one_message()
1547 if (!ctlr->ptp_sts_supported) { in spi_transfer_one_message()
1548 ptp_read_system_postts(xfer->ptp_sts); in spi_transfer_one_message()
1549 xfer->ptp_sts_word_post = xfer->len; in spi_transfer_one_message()
1554 if (msg->status != -EINPROGRESS) in spi_transfer_one_message()
1559 if (xfer->cs_change) { in spi_transfer_one_message()
1560 if (list_is_last(&xfer->transfer_list, in spi_transfer_one_message()
1561 &msg->transfers)) { in spi_transfer_one_message()
1564 if (!xfer->cs_off) in spi_transfer_one_message()
1565 spi_set_cs(msg->spi, false, false); in spi_transfer_one_message()
1567 if (!list_next_entry(xfer, transfer_list)->cs_off) in spi_transfer_one_message()
1568 spi_set_cs(msg->spi, true, false); in spi_transfer_one_message()
1570 } else if (!list_is_last(&xfer->transfer_list, &msg->transfers) && in spi_transfer_one_message()
1571 xfer->cs_off != list_next_entry(xfer, transfer_list)->cs_off) { in spi_transfer_one_message()
1572 spi_set_cs(msg->spi, xfer->cs_off, false); in spi_transfer_one_message()
1575 msg->actual_length += xfer->len; in spi_transfer_one_message()
1580 spi_set_cs(msg->spi, false, false); in spi_transfer_one_message()
1582 if (msg->status == -EINPROGRESS) in spi_transfer_one_message()
1583 msg->status = ret; in spi_transfer_one_message()
1585 if (msg->status && ctlr->handle_err) in spi_transfer_one_message()
1586 ctlr->handle_err(ctlr, msg); in spi_transfer_one_message()
1594 * spi_finalize_current_transfer - report completion of a transfer
1603 complete(&ctlr->xfer_completion); in spi_finalize_current_transfer()
1609 if (ctlr->auto_runtime_pm) { in spi_idle_runtime_pm()
1610 pm_runtime_mark_last_busy(ctlr->dev.parent); in spi_idle_runtime_pm()
1611 pm_runtime_put_autosuspend(ctlr->dev.parent); in spi_idle_runtime_pm()
1621 if (!was_busy && ctlr->auto_runtime_pm) { in __spi_pump_transfer_message()
1622 ret = pm_runtime_get_sync(ctlr->dev.parent); in __spi_pump_transfer_message()
1624 pm_runtime_put_noidle(ctlr->dev.parent); in __spi_pump_transfer_message()
1625 dev_err(&ctlr->dev, "Failed to power device: %d\n", in __spi_pump_transfer_message()
1628 msg->status = ret; in __spi_pump_transfer_message()
1638 if (!was_busy && ctlr->prepare_transfer_hardware) { in __spi_pump_transfer_message()
1639 ret = ctlr->prepare_transfer_hardware(ctlr); in __spi_pump_transfer_message()
1641 dev_err(&ctlr->dev, in __spi_pump_transfer_message()
1645 if (ctlr->auto_runtime_pm) in __spi_pump_transfer_message()
1646 pm_runtime_put(ctlr->dev.parent); in __spi_pump_transfer_message()
1648 msg->status = ret; in __spi_pump_transfer_message()
1658 spi_max_transfer_size(msg->spi), in __spi_pump_transfer_message()
1661 msg->status = ret; in __spi_pump_transfer_message()
1666 if (ctlr->prepare_message) { in __spi_pump_transfer_message()
1667 ret = ctlr->prepare_message(ctlr, msg); in __spi_pump_transfer_message()
1669 dev_err(&ctlr->dev, "failed to prepare message: %d\n", in __spi_pump_transfer_message()
1671 msg->status = ret; in __spi_pump_transfer_message()
1675 msg->prepared = true; in __spi_pump_transfer_message()
1680 msg->status = ret; in __spi_pump_transfer_message()
1685 if (!ctlr->ptp_sts_supported && !ctlr->transfer_one) { in __spi_pump_transfer_message()
1686 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_pump_transfer_message()
1687 xfer->ptp_sts_word_pre = 0; in __spi_pump_transfer_message()
1688 ptp_read_system_prets(xfer->ptp_sts); in __spi_pump_transfer_message()
1698 * ctlr->cur_msg. in __spi_pump_transfer_message()
1705 WRITE_ONCE(ctlr->cur_msg_incomplete, true); in __spi_pump_transfer_message()
1706 WRITE_ONCE(ctlr->cur_msg_need_completion, false); in __spi_pump_transfer_message()
1707 reinit_completion(&ctlr->cur_msg_completion); in __spi_pump_transfer_message()
1710 ret = ctlr->transfer_one_message(ctlr, msg); in __spi_pump_transfer_message()
1712 dev_err(&ctlr->dev, in __spi_pump_transfer_message()
1717 WRITE_ONCE(ctlr->cur_msg_need_completion, true); in __spi_pump_transfer_message()
1719 if (READ_ONCE(ctlr->cur_msg_incomplete)) in __spi_pump_transfer_message()
1720 wait_for_completion(&ctlr->cur_msg_completion); in __spi_pump_transfer_message()
1726 * __spi_pump_messages - function which processes SPI message queue
1746 mutex_lock(&ctlr->io_mutex); in __spi_pump_messages()
1749 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_pump_messages()
1752 if (ctlr->cur_msg) in __spi_pump_messages()
1756 if (list_empty(&ctlr->queue) || !ctlr->running) { in __spi_pump_messages()
1757 if (!ctlr->busy) in __spi_pump_messages()
1760 /* Defer any non-atomic teardown to the thread */ in __spi_pump_messages()
1762 if (!ctlr->dummy_rx && !ctlr->dummy_tx && in __spi_pump_messages()
1763 !ctlr->unprepare_transfer_hardware) { in __spi_pump_messages()
1765 ctlr->busy = false; in __spi_pump_messages()
1766 ctlr->queue_empty = true; in __spi_pump_messages()
1769 kthread_queue_work(ctlr->kworker, in __spi_pump_messages()
1770 &ctlr->pump_messages); in __spi_pump_messages()
1775 ctlr->busy = false; in __spi_pump_messages()
1776 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1778 kfree(ctlr->dummy_rx); in __spi_pump_messages()
1779 ctlr->dummy_rx = NULL; in __spi_pump_messages()
1780 kfree(ctlr->dummy_tx); in __spi_pump_messages()
1781 ctlr->dummy_tx = NULL; in __spi_pump_messages()
1782 if (ctlr->unprepare_transfer_hardware && in __spi_pump_messages()
1783 ctlr->unprepare_transfer_hardware(ctlr)) in __spi_pump_messages()
1784 dev_err(&ctlr->dev, in __spi_pump_messages()
1789 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_pump_messages()
1790 ctlr->queue_empty = true; in __spi_pump_messages()
1795 msg = list_first_entry(&ctlr->queue, struct spi_message, queue); in __spi_pump_messages()
1796 ctlr->cur_msg = msg; in __spi_pump_messages()
1798 list_del_init(&msg->queue); in __spi_pump_messages()
1799 if (ctlr->busy) in __spi_pump_messages()
1802 ctlr->busy = true; in __spi_pump_messages()
1803 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1806 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in __spi_pump_messages()
1808 ctlr->cur_msg = NULL; in __spi_pump_messages()
1809 ctlr->fallback = false; in __spi_pump_messages()
1811 mutex_unlock(&ctlr->io_mutex); in __spi_pump_messages()
1819 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1820 mutex_unlock(&ctlr->io_mutex); in __spi_pump_messages()
1824 * spi_pump_messages - kthread work function which processes spi message queue
1836 * spi_take_timestamp_pre - helper to collect the beginning of the TX timestamp
1859 if (!xfer->ptp_sts) in spi_take_timestamp_pre()
1862 if (xfer->timestamped) in spi_take_timestamp_pre()
1865 if (progress > xfer->ptp_sts_word_pre) in spi_take_timestamp_pre()
1869 xfer->ptp_sts_word_pre = progress; in spi_take_timestamp_pre()
1872 local_irq_save(ctlr->irq_flags); in spi_take_timestamp_pre()
1876 ptp_read_system_prets(xfer->ptp_sts); in spi_take_timestamp_pre()
1881 * spi_take_timestamp_post - helper to collect the end of the TX timestamp
1885 * @irqs_off: If true, will re-enable IRQs and preemption for the local CPU.
1896 if (!xfer->ptp_sts) in spi_take_timestamp_post()
1899 if (xfer->timestamped) in spi_take_timestamp_post()
1902 if (progress < xfer->ptp_sts_word_post) in spi_take_timestamp_post()
1905 ptp_read_system_postts(xfer->ptp_sts); in spi_take_timestamp_post()
1908 local_irq_restore(ctlr->irq_flags); in spi_take_timestamp_post()
1913 xfer->ptp_sts_word_post = progress; in spi_take_timestamp_post()
1915 xfer->timestamped = 1; in spi_take_timestamp_post()
1920 * spi_set_thread_rt - set the controller to pump at realtime priority
1924 * (by setting the ->rt value before calling spi_register_controller()) or
1936 dev_info(&ctlr->dev, in spi_set_thread_rt()
1938 sched_set_fifo(ctlr->kworker->task); in spi_set_thread_rt()
1943 ctlr->running = false; in spi_init_queue()
1944 ctlr->busy = false; in spi_init_queue()
1945 ctlr->queue_empty = true; in spi_init_queue()
1947 ctlr->kworker = kthread_create_worker(0, dev_name(&ctlr->dev)); in spi_init_queue()
1948 if (IS_ERR(ctlr->kworker)) { in spi_init_queue()
1949 dev_err(&ctlr->dev, "failed to create message pump kworker\n"); in spi_init_queue()
1950 return PTR_ERR(ctlr->kworker); in spi_init_queue()
1953 kthread_init_work(&ctlr->pump_messages, spi_pump_messages); in spi_init_queue()
1962 if (ctlr->rt) in spi_init_queue()
1969 * spi_get_next_queued_message() - called by driver to check for queued
1984 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_get_next_queued_message()
1985 next = list_first_entry_or_null(&ctlr->queue, struct spi_message, in spi_get_next_queued_message()
1987 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_get_next_queued_message()
1994 * spi_finalize_current_message() - the current message is complete
2006 mesg = ctlr->cur_msg; in spi_finalize_current_message()
2008 if (!ctlr->ptp_sts_supported && !ctlr->transfer_one) { in spi_finalize_current_message()
2009 list_for_each_entry(xfer, &mesg->transfers, transfer_list) { in spi_finalize_current_message()
2010 ptp_read_system_postts(xfer->ptp_sts); in spi_finalize_current_message()
2011 xfer->ptp_sts_word_post = xfer->len; in spi_finalize_current_message()
2015 if (unlikely(ctlr->ptp_sts_supported)) in spi_finalize_current_message()
2016 list_for_each_entry(xfer, &mesg->transfers, transfer_list) in spi_finalize_current_message()
2017 WARN_ON_ONCE(xfer->ptp_sts && !xfer->timestamped); in spi_finalize_current_message()
2030 if (mesg->prepared && ctlr->unprepare_message) { in spi_finalize_current_message()
2031 ret = ctlr->unprepare_message(ctlr, mesg); in spi_finalize_current_message()
2033 dev_err(&ctlr->dev, "failed to unprepare message: %d\n", in spi_finalize_current_message()
2038 mesg->prepared = false; in spi_finalize_current_message()
2040 WRITE_ONCE(ctlr->cur_msg_incomplete, false); in spi_finalize_current_message()
2042 if (READ_ONCE(ctlr->cur_msg_need_completion)) in spi_finalize_current_message()
2043 complete(&ctlr->cur_msg_completion); in spi_finalize_current_message()
2047 mesg->state = NULL; in spi_finalize_current_message()
2048 if (mesg->complete) in spi_finalize_current_message()
2049 mesg->complete(mesg->context); in spi_finalize_current_message()
2057 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_start_queue()
2059 if (ctlr->running || ctlr->busy) { in spi_start_queue()
2060 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_start_queue()
2061 return -EBUSY; in spi_start_queue()
2064 ctlr->running = true; in spi_start_queue()
2065 ctlr->cur_msg = NULL; in spi_start_queue()
2066 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_start_queue()
2068 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in spi_start_queue()
2079 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_stop_queue()
2083 * A wait_queue on the ctlr->busy could be used, but then the common in spi_stop_queue()
2087 while ((!list_empty(&ctlr->queue) || ctlr->busy) && limit--) { in spi_stop_queue()
2088 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_stop_queue()
2090 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_stop_queue()
2093 if (!list_empty(&ctlr->queue) || ctlr->busy) in spi_stop_queue()
2094 ret = -EBUSY; in spi_stop_queue()
2096 ctlr->running = false; in spi_stop_queue()
2098 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_stop_queue()
2101 dev_warn(&ctlr->dev, "could not stop message queue\n"); in spi_stop_queue()
2120 dev_err(&ctlr->dev, "problem destroying queue\n"); in spi_destroy_queue()
2124 kthread_destroy_worker(ctlr->kworker); in spi_destroy_queue()
2133 struct spi_controller *ctlr = spi->controller; in __spi_queued_transfer()
2136 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2138 if (!ctlr->running) { in __spi_queued_transfer()
2139 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2140 return -ESHUTDOWN; in __spi_queued_transfer()
2142 msg->actual_length = 0; in __spi_queued_transfer()
2143 msg->status = -EINPROGRESS; in __spi_queued_transfer()
2145 list_add_tail(&msg->queue, &ctlr->queue); in __spi_queued_transfer()
2146 ctlr->queue_empty = false; in __spi_queued_transfer()
2147 if (!ctlr->busy && need_pump) in __spi_queued_transfer()
2148 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in __spi_queued_transfer()
2150 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2155 * spi_queued_transfer - transfer function for queued transfers
2170 ctlr->transfer = spi_queued_transfer; in spi_controller_initialize_queue()
2171 if (!ctlr->transfer_one_message) in spi_controller_initialize_queue()
2172 ctlr->transfer_one_message = spi_transfer_one_message; in spi_controller_initialize_queue()
2177 dev_err(&ctlr->dev, "problem initializing queue\n"); in spi_controller_initialize_queue()
2180 ctlr->queued = true; in spi_controller_initialize_queue()
2183 dev_err(&ctlr->dev, "problem starting queue\n"); in spi_controller_initialize_queue()
2196 * spi_flush_queue - Send all pending messages in the queue from the callers'
2201 * sent before doing something. Is used by the spi-mem code to make sure SPI
2203 * before the spi-mem operation.
2207 if (ctlr->transfer == spi_queued_transfer) in spi_flush_queue()
2211 /*-------------------------------------------------------------------------*/
2221 delay->value = DIV_ROUND_UP(value, 1000); in of_spi_parse_dt_cs_delay()
2222 delay->unit = SPI_DELAY_UNIT_USECS; in of_spi_parse_dt_cs_delay()
2224 delay->value = value; in of_spi_parse_dt_cs_delay()
2225 delay->unit = SPI_DELAY_UNIT_NSECS; in of_spi_parse_dt_cs_delay()
2237 if (of_property_read_bool(nc, "spi-cpha")) in of_spi_parse_dt()
2238 spi->mode |= SPI_CPHA; in of_spi_parse_dt()
2239 if (of_property_read_bool(nc, "spi-cpol")) in of_spi_parse_dt()
2240 spi->mode |= SPI_CPOL; in of_spi_parse_dt()
2241 if (of_property_read_bool(nc, "spi-3wire")) in of_spi_parse_dt()
2242 spi->mode |= SPI_3WIRE; in of_spi_parse_dt()
2243 if (of_property_read_bool(nc, "spi-lsb-first")) in of_spi_parse_dt()
2244 spi->mode |= SPI_LSB_FIRST; in of_spi_parse_dt()
2245 if (of_property_read_bool(nc, "spi-cs-high")) in of_spi_parse_dt()
2246 spi->mode |= SPI_CS_HIGH; in of_spi_parse_dt()
2249 if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { in of_spi_parse_dt()
2252 spi->mode |= SPI_NO_TX; in of_spi_parse_dt()
2257 spi->mode |= SPI_TX_DUAL; in of_spi_parse_dt()
2260 spi->mode |= SPI_TX_QUAD; in of_spi_parse_dt()
2263 spi->mode |= SPI_TX_OCTAL; in of_spi_parse_dt()
2266 dev_warn(&ctlr->dev, in of_spi_parse_dt()
2267 "spi-tx-bus-width %d not supported\n", in of_spi_parse_dt()
2273 if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) { in of_spi_parse_dt()
2276 spi->mode |= SPI_NO_RX; in of_spi_parse_dt()
2281 spi->mode |= SPI_RX_DUAL; in of_spi_parse_dt()
2284 spi->mode |= SPI_RX_QUAD; in of_spi_parse_dt()
2287 spi->mode |= SPI_RX_OCTAL; in of_spi_parse_dt()
2290 dev_warn(&ctlr->dev, in of_spi_parse_dt()
2291 "spi-rx-bus-width %d not supported\n", in of_spi_parse_dt()
2299 dev_err(&ctlr->dev, "%pOF is not called 'slave'\n", in of_spi_parse_dt()
2301 return -EINVAL; in of_spi_parse_dt()
2309 dev_err(&ctlr->dev, "%pOF has no valid 'reg' property (%d)\n", in of_spi_parse_dt()
2316 if (!of_property_read_u32(nc, "spi-max-frequency", &value)) in of_spi_parse_dt()
2317 spi->max_speed_hz = value; in of_spi_parse_dt()
2320 of_spi_parse_dt_cs_delay(nc, &spi->cs_setup, "spi-cs-setup-delay-ns"); in of_spi_parse_dt()
2321 of_spi_parse_dt_cs_delay(nc, &spi->cs_hold, "spi-cs-hold-delay-ns"); in of_spi_parse_dt()
2322 of_spi_parse_dt_cs_delay(nc, &spi->cs_inactive, "spi-cs-inactive-delay-ns"); in of_spi_parse_dt()
2336 dev_err(&ctlr->dev, "spi_device alloc error for %pOF\n", nc); in of_register_spi_device()
2337 rc = -ENOMEM; in of_register_spi_device()
2342 rc = of_alias_from_compatible(nc, spi->modalias, in of_register_spi_device()
2343 sizeof(spi->modalias)); in of_register_spi_device()
2345 dev_err(&ctlr->dev, "cannot find modalias for %pOF\n", nc); in of_register_spi_device()
2356 device_set_node(&spi->dev, of_fwnode_handle(nc)); in of_register_spi_device()
2361 dev_err(&ctlr->dev, "spi_device register error %pOF\n", nc); in of_register_spi_device()
2375 * of_register_spi_devices() - Register child devices onto the SPI bus
2386 for_each_available_child_of_node(ctlr->dev.of_node, nc) { in of_register_spi_devices()
2391 dev_warn(&ctlr->dev, in of_register_spi_devices()
2402 * spi_new_ancillary_device() - Register ancillary SPI device
2406 * Register an ancillary SPI device; for example some chips have a chip-select
2416 struct spi_controller *ctlr = spi->controller; in spi_new_ancillary_device()
2423 rc = -ENOMEM; in spi_new_ancillary_device()
2427 strscpy(ancillary->modalias, "dummy", sizeof(ancillary->modalias)); in spi_new_ancillary_device()
2429 /* Use provided chip-select for ancillary device */ in spi_new_ancillary_device()
2433 ancillary->max_speed_hz = spi->max_speed_hz; in spi_new_ancillary_device()
2434 ancillary->mode = spi->mode; in spi_new_ancillary_device()
2436 WARN_ON(!mutex_is_locked(&ctlr->add_lock)); in spi_new_ancillary_device()
2441 dev_err(&spi->dev, "failed to register ancillary device\n"); in spi_new_ancillary_device()
2470 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) in acpi_spi_count()
2473 sb = &ares->data.spi_serial_bus; in acpi_spi_count()
2474 if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_SPI) in acpi_spi_count()
2483 * acpi_spi_count_resources - Count the number of SpiSerialBus resources
2486 * Return: the number of SpiSerialBus resources in the ACPI-device's
2487 * resource-list; or a negative error code.
2514 && obj->buffer.length >= 4) in acpi_spi_parse_apple_properties()
2515 lookup->max_speed_hz = NSEC_PER_SEC / *(u32 *)obj->buffer.pointer; in acpi_spi_parse_apple_properties()
2518 && obj->buffer.length == 8) in acpi_spi_parse_apple_properties()
2519 lookup->bits_per_word = *(u64 *)obj->buffer.pointer; in acpi_spi_parse_apple_properties()
2522 && obj->buffer.length == 8 && !*(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2523 lookup->mode |= SPI_LSB_FIRST; in acpi_spi_parse_apple_properties()
2526 && obj->buffer.length == 8 && *(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2527 lookup->mode |= SPI_CPOL; in acpi_spi_parse_apple_properties()
2530 && obj->buffer.length == 8 && *(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2531 lookup->mode |= SPI_CPHA; in acpi_spi_parse_apple_properties()
2539 struct spi_controller *ctlr = lookup->ctlr; in acpi_spi_add_resource()
2541 if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { in acpi_spi_add_resource()
2546 sb = &ares->data.spi_serial_bus; in acpi_spi_add_resource()
2547 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_SPI) { in acpi_spi_add_resource()
2549 if (lookup->index != -1 && lookup->n++ != lookup->index) in acpi_spi_add_resource()
2553 sb->resource_source.string_ptr, in acpi_spi_add_resource()
2557 return -ENODEV; in acpi_spi_add_resource()
2560 if (ACPI_HANDLE(ctlr->dev.parent) != parent_handle) in acpi_spi_add_resource()
2561 return -ENODEV; in acpi_spi_add_resource()
2567 return -ENODEV; in acpi_spi_add_resource()
2571 return -EPROBE_DEFER; in acpi_spi_add_resource()
2573 lookup->ctlr = ctlr; in acpi_spi_add_resource()
2580 * 0 .. max - 1 so we need to ask the driver to in acpi_spi_add_resource()
2583 if (ctlr->fw_translate_cs) { in acpi_spi_add_resource()
2584 int cs = ctlr->fw_translate_cs(ctlr, in acpi_spi_add_resource()
2585 sb->device_selection); in acpi_spi_add_resource()
2588 lookup->chip_select = cs; in acpi_spi_add_resource()
2590 lookup->chip_select = sb->device_selection; in acpi_spi_add_resource()
2593 lookup->max_speed_hz = sb->connection_speed; in acpi_spi_add_resource()
2594 lookup->bits_per_word = sb->data_bit_length; in acpi_spi_add_resource()
2596 if (sb->clock_phase == ACPI_SPI_SECOND_PHASE) in acpi_spi_add_resource()
2597 lookup->mode |= SPI_CPHA; in acpi_spi_add_resource()
2598 if (sb->clock_polarity == ACPI_SPI_START_HIGH) in acpi_spi_add_resource()
2599 lookup->mode |= SPI_CPOL; in acpi_spi_add_resource()
2600 if (sb->device_polarity == ACPI_SPI_ACTIVE_HIGH) in acpi_spi_add_resource()
2601 lookup->mode |= SPI_CS_HIGH; in acpi_spi_add_resource()
2603 } else if (lookup->irq < 0) { in acpi_spi_add_resource()
2607 lookup->irq = r.start; in acpi_spi_add_resource()
2615 * acpi_spi_device_alloc - Allocate a spi device, and fill it in with ACPI information
2625 * If index is set to -1, index is not used.
2626 * Note: If index is -1, ctlr must be set.
2640 if (!ctlr && index == -1) in acpi_spi_device_alloc()
2641 return ERR_PTR(-EINVAL); in acpi_spi_device_alloc()
2644 lookup.irq = -1; in acpi_spi_device_alloc()
2658 ACPI_SUCCESS(acpi_get_parent(adev->handle, &parent_handle)) && in acpi_spi_device_alloc()
2659 ACPI_HANDLE(lookup.ctlr->dev.parent) == parent_handle) { in acpi_spi_device_alloc()
2665 return ERR_PTR(-ENODEV); in acpi_spi_device_alloc()
2669 dev_err(&lookup.ctlr->dev, "failed to allocate SPI device for %s\n", in acpi_spi_device_alloc()
2670 dev_name(&adev->dev)); in acpi_spi_device_alloc()
2671 return ERR_PTR(-ENOMEM); in acpi_spi_device_alloc()
2674 ACPI_COMPANION_SET(&spi->dev, adev); in acpi_spi_device_alloc()
2675 spi->max_speed_hz = lookup.max_speed_hz; in acpi_spi_device_alloc()
2676 spi->mode |= lookup.mode; in acpi_spi_device_alloc()
2677 spi->irq = lookup.irq; in acpi_spi_device_alloc()
2678 spi->bits_per_word = lookup.bits_per_word; in acpi_spi_device_alloc()
2690 if (acpi_bus_get_status(adev) || !adev->status.present || in acpi_register_spi_device()
2694 spi = acpi_spi_device_alloc(ctlr, adev, -1); in acpi_register_spi_device()
2696 if (PTR_ERR(spi) == -ENOMEM) in acpi_register_spi_device()
2702 acpi_set_modalias(adev, acpi_device_hid(adev), spi->modalias, in acpi_register_spi_device()
2703 sizeof(spi->modalias)); in acpi_register_spi_device()
2705 if (spi->irq < 0) in acpi_register_spi_device()
2706 spi->irq = acpi_dev_gpio_irq_get(adev, 0); in acpi_register_spi_device()
2710 adev->power.flags.ignore_parent = true; in acpi_register_spi_device()
2712 adev->power.flags.ignore_parent = false; in acpi_register_spi_device()
2713 dev_err(&ctlr->dev, "failed to add SPI device %s from ACPI\n", in acpi_register_spi_device()
2714 dev_name(&adev->dev)); in acpi_register_spi_device()
2740 handle = ACPI_HANDLE(ctlr->dev.parent); in acpi_register_spi_devices()
2748 dev_warn(&ctlr->dev, "failed to enumerate SPI slaves\n"); in acpi_register_spi_devices()
2770 * spi_slave_abort - abort the ongoing transfer request on an SPI slave
2776 struct spi_controller *ctlr = spi->controller; in spi_slave_abort()
2778 if (spi_controller_is_slave(ctlr) && ctlr->slave_abort) in spi_slave_abort()
2779 return ctlr->slave_abort(ctlr); in spi_slave_abort()
2781 return -ENOTSUPP; in spi_slave_abort()
2787 struct spi_controller *ctlr = spi->controller; in spi_target_abort()
2789 if (spi_controller_is_target(ctlr) && ctlr->target_abort) in spi_target_abort()
2790 return ctlr->target_abort(ctlr); in spi_target_abort()
2792 return -ENOTSUPP; in spi_target_abort()
2803 child = device_find_any_child(&ctlr->dev); in slave_show()
2804 return sysfs_emit(buf, "%s\n", child ? to_spi_device(child)->modalias : NULL); in slave_show()
2819 return -EINVAL; in slave_store()
2821 child = device_find_any_child(&ctlr->dev); in slave_store()
2832 return -ENOMEM; in slave_store()
2834 strscpy(spi->modalias, name, sizeof(spi->modalias)); in slave_store()
2873 * __spi_alloc_controller - allocate an SPI master or slave controller
2875 * @size: how much zeroed driver-private data to allocate; the pointer to this
2910 device_initialize(&ctlr->dev); in __spi_alloc_controller()
2911 INIT_LIST_HEAD(&ctlr->queue); in __spi_alloc_controller()
2912 spin_lock_init(&ctlr->queue_lock); in __spi_alloc_controller()
2913 spin_lock_init(&ctlr->bus_lock_spinlock); in __spi_alloc_controller()
2914 mutex_init(&ctlr->bus_lock_mutex); in __spi_alloc_controller()
2915 mutex_init(&ctlr->io_mutex); in __spi_alloc_controller()
2916 mutex_init(&ctlr->add_lock); in __spi_alloc_controller()
2917 ctlr->bus_num = -1; in __spi_alloc_controller()
2918 ctlr->num_chipselect = 1; in __spi_alloc_controller()
2919 ctlr->slave = slave; in __spi_alloc_controller()
2921 ctlr->dev.class = &spi_slave_class; in __spi_alloc_controller()
2923 ctlr->dev.class = &spi_master_class; in __spi_alloc_controller()
2924 ctlr->dev.parent = dev; in __spi_alloc_controller()
2925 pm_suspend_ignore_children(&ctlr->dev, true); in __spi_alloc_controller()
2938 * __devm_spi_alloc_controller - resource-managed __spi_alloc_controller()
2940 * @size: how much zeroed driver-private data to allocate
2965 ctlr->devm_allocated = true; in __devm_spi_alloc_controller()
2977 * spi_get_gpio_descs() - grab chip select GPIOs for the master
2978 * @ctlr: The SPI master to grab GPIO descriptors for
2984 struct device *dev = &ctlr->dev; in spi_get_gpio_descs()
2991 if (nb == -ENOENT) in spi_get_gpio_descs()
2996 ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect); in spi_get_gpio_descs()
2998 cs = devm_kcalloc(dev, ctlr->num_chipselect, sizeof(*cs), in spi_get_gpio_descs()
3001 return -ENOMEM; in spi_get_gpio_descs()
3002 ctlr->cs_gpiods = cs; in spi_get_gpio_descs()
3019 * If we find a CS GPIO, name it after the device and in spi_get_gpio_descs()
3027 return -ENOMEM; in spi_get_gpio_descs()
3033 if (ctlr->max_native_cs && i >= ctlr->max_native_cs) { in spi_get_gpio_descs()
3035 return -EINVAL; in spi_get_gpio_descs()
3040 ctlr->unused_native_cs = ffs(~native_cs_mask) - 1; in spi_get_gpio_descs()
3042 if ((ctlr->flags & SPI_CONTROLLER_GPIO_SS) && num_cs_gpios && in spi_get_gpio_descs()
3043 ctlr->max_native_cs && ctlr->unused_native_cs >= ctlr->max_native_cs) { in spi_get_gpio_descs()
3045 return -EINVAL; in spi_get_gpio_descs()
3054 * The controller may implement only the high-level SPI-memory like in spi_controller_check_ops()
3057 * If ->mem_ops or ->mem_ops->exec_op is NULL, we request that at least in spi_controller_check_ops()
3058 * one of the ->transfer_xxx() method be implemented. in spi_controller_check_ops()
3060 if (!ctlr->mem_ops || !ctlr->mem_ops->exec_op) { in spi_controller_check_ops()
3061 if (!ctlr->transfer && !ctlr->transfer_one && in spi_controller_check_ops()
3062 !ctlr->transfer_one_message) { in spi_controller_check_ops()
3063 return -EINVAL; in spi_controller_check_ops()
3079 return id == -ENOSPC ? -EBUSY : id; in spi_controller_id_alloc()
3080 ctlr->bus_num = id; in spi_controller_id_alloc()
3085 * spi_register_controller - register SPI master or slave controller
3090 * SPI controllers connect to their drivers using some non-SPI bus,
3095 * and board-specific addressing for SPI devices combines those numbers
3109 struct device *dev = ctlr->dev.parent; in spi_register_controller()
3115 return -ENODEV; in spi_register_controller()
3125 if (ctlr->bus_num < 0) in spi_register_controller()
3126 ctlr->bus_num = of_alias_get_id(ctlr->dev.of_node, "spi"); in spi_register_controller()
3127 if (ctlr->bus_num >= 0) { in spi_register_controller()
3128 /* Devices with a fixed bus num must check-in with the num */ in spi_register_controller()
3129 status = spi_controller_id_alloc(ctlr, ctlr->bus_num, ctlr->bus_num + 1); in spi_register_controller()
3133 if (ctlr->bus_num < 0) { in spi_register_controller()
3144 ctlr->bus_lock_flag = 0; in spi_register_controller()
3145 init_completion(&ctlr->xfer_completion); in spi_register_controller()
3146 init_completion(&ctlr->cur_msg_completion); in spi_register_controller()
3147 if (!ctlr->max_dma_len) in spi_register_controller()
3148 ctlr->max_dma_len = INT_MAX; in spi_register_controller()
3154 dev_set_name(&ctlr->dev, "spi%u", ctlr->bus_num); in spi_register_controller()
3156 if (!spi_controller_is_slave(ctlr) && ctlr->use_gpio_descriptors) { in spi_register_controller()
3161 * A controller using GPIO descriptors always in spi_register_controller()
3164 ctlr->mode_bits |= SPI_CS_HIGH; in spi_register_controller()
3168 * Even if it's just one always-selected device, there must in spi_register_controller()
3171 if (!ctlr->num_chipselect) { in spi_register_controller()
3172 status = -EINVAL; in spi_register_controller()
3176 /* Setting last_cs to -1 means no chip selected */ in spi_register_controller()
3177 ctlr->last_cs = -1; in spi_register_controller()
3179 status = device_add(&ctlr->dev); in spi_register_controller()
3184 dev_name(&ctlr->dev)); in spi_register_controller()
3188 * need the queueing logic if the driver is only supporting high-level in spi_register_controller()
3191 if (ctlr->transfer) { in spi_register_controller()
3193 } else if (ctlr->transfer_one || ctlr->transfer_one_message) { in spi_register_controller()
3196 device_del(&ctlr->dev); in spi_register_controller()
3201 ctlr->pcpu_statistics = spi_alloc_pcpu_stats(dev); in spi_register_controller()
3202 if (!ctlr->pcpu_statistics) { in spi_register_controller()
3203 dev_err(dev, "Error allocating per-cpu statistics\n"); in spi_register_controller()
3204 status = -ENOMEM; in spi_register_controller()
3209 list_add_tail(&ctlr->list, &spi_controller_list); in spi_register_controller()
3211 spi_match_controller_to_boardinfo(ctlr, &bi->board_info); in spi_register_controller()
3223 idr_remove(&spi_master_idr, ctlr->bus_num); in spi_register_controller()
3235 * devm_spi_register_controller - register managed SPI master or slave
3255 return -ENOMEM; in devm_spi_register_controller()
3276 * spi_unregister_controller - unregister SPI master or slave controller
3290 int id = ctlr->bus_num; in spi_unregister_controller()
3294 mutex_lock(&ctlr->add_lock); in spi_unregister_controller()
3296 device_for_each_child(&ctlr->dev, NULL, __unregister); in spi_unregister_controller()
3302 if (ctlr->queued) { in spi_unregister_controller()
3304 dev_err(&ctlr->dev, "queue remove failed\n"); in spi_unregister_controller()
3307 list_del(&ctlr->list); in spi_unregister_controller()
3310 device_del(&ctlr->dev); in spi_unregister_controller()
3319 mutex_unlock(&ctlr->add_lock); in spi_unregister_controller()
3325 if (!ctlr->devm_allocated) in spi_unregister_controller()
3326 put_device(&ctlr->dev); in spi_unregister_controller()
3332 return ctlr->flags & SPI_CONTROLLER_SUSPENDED ? -ESHUTDOWN : 0; in __spi_check_suspended()
3337 mutex_lock(&ctlr->bus_lock_mutex); in __spi_mark_suspended()
3338 ctlr->flags |= SPI_CONTROLLER_SUSPENDED; in __spi_mark_suspended()
3339 mutex_unlock(&ctlr->bus_lock_mutex); in __spi_mark_suspended()
3344 mutex_lock(&ctlr->bus_lock_mutex); in __spi_mark_resumed()
3345 ctlr->flags &= ~SPI_CONTROLLER_SUSPENDED; in __spi_mark_resumed()
3346 mutex_unlock(&ctlr->bus_lock_mutex); in __spi_mark_resumed()
3353 /* Basically no-ops for non-queued controllers */ in spi_controller_suspend()
3354 if (ctlr->queued) { in spi_controller_suspend()
3357 dev_err(&ctlr->dev, "queue stop failed\n"); in spi_controller_suspend()
3371 if (ctlr->queued) { in spi_controller_resume()
3374 dev_err(&ctlr->dev, "queue restart failed\n"); in spi_controller_resume()
3380 /*-------------------------------------------------------------------------*/
3392 if (rxfer->release) in __spi_replace_transfers_release()
3393 rxfer->release(ctlr, msg, res); in __spi_replace_transfers_release()
3396 list_splice(&rxfer->replaced_transfers, rxfer->replaced_after); in __spi_replace_transfers_release()
3399 for (i = 0; i < rxfer->inserted; i++) in __spi_replace_transfers_release()
3400 list_del(&rxfer->inserted_transfers[i].transfer_list); in __spi_replace_transfers_release()
3404 * spi_replace_transfers - replace transfers with several transfers
3432 rxfer = spi_res_alloc(msg->spi, __spi_replace_transfers_release, in spi_replace_transfers()
3437 return ERR_PTR(-ENOMEM); in spi_replace_transfers()
3440 rxfer->release = release; in spi_replace_transfers()
3444 rxfer->extradata = in spi_replace_transfers()
3445 &rxfer->inserted_transfers[insert]; in spi_replace_transfers()
3448 INIT_LIST_HEAD(&rxfer->replaced_transfers); in spi_replace_transfers()
3452 * the @replaced_transfers - it may be spi_message.messages! in spi_replace_transfers()
3454 rxfer->replaced_after = xfer_first->transfer_list.prev; in spi_replace_transfers()
3459 * If the entry after replaced_after it is msg->transfers in spi_replace_transfers()
3463 if (rxfer->replaced_after->next == &msg->transfers) { in spi_replace_transfers()
3464 dev_err(&msg->spi->dev, in spi_replace_transfers()
3467 list_splice(&rxfer->replaced_transfers, in spi_replace_transfers()
3468 rxfer->replaced_after); in spi_replace_transfers()
3474 return ERR_PTR(-EINVAL); in spi_replace_transfers()
3481 list_move_tail(rxfer->replaced_after->next, in spi_replace_transfers()
3482 &rxfer->replaced_transfers); in spi_replace_transfers()
3491 xfer = &rxfer->inserted_transfers[insert - 1 - i]; in spi_replace_transfers()
3497 list_add(&xfer->transfer_list, rxfer->replaced_after); in spi_replace_transfers()
3501 xfer->cs_change = false; in spi_replace_transfers()
3502 xfer->delay.value = 0; in spi_replace_transfers()
3507 rxfer->inserted = insert; in spi_replace_transfers()
3527 count = DIV_ROUND_UP(xfer->len, maxsize); in __spi_split_transfer_maxsize()
3533 xfers = srt->inserted_transfers; in __spi_split_transfer_maxsize()
3565 xfers[i].len = min(maxsize, xfers[i].len - offset); in __spi_split_transfer_maxsize()
3572 *xferp = &xfers[count - 1]; in __spi_split_transfer_maxsize()
3575 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, in __spi_split_transfer_maxsize()
3577 SPI_STATISTICS_INCREMENT_FIELD(msg->spi->pcpu_statistics, in __spi_split_transfer_maxsize()
3584 * spi_split_transfers_maxsize - split spi transfers into multiple transfers
3609 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_split_transfers_maxsize()
3610 if (xfer->len > maxsize) { in spi_split_transfers_maxsize()
3624 * spi_split_transfers_maxwords - split SPI transfers into multiple transfers
3648 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_split_transfers_maxwords()
3652 maxsize = maxwords * roundup_pow_of_two(BITS_TO_BYTES(xfer->bits_per_word)); in spi_split_transfers_maxwords()
3653 if (xfer->len > maxsize) { in spi_split_transfers_maxwords()
3665 /*-------------------------------------------------------------------------*/
3675 if (ctlr->bits_per_word_mask) { in __spi_validate_bits_per_word()
3678 return -EINVAL; in __spi_validate_bits_per_word()
3679 if (!(ctlr->bits_per_word_mask & SPI_BPW_MASK(bits_per_word))) in __spi_validate_bits_per_word()
3680 return -EINVAL; in __spi_validate_bits_per_word()
3687 * spi_set_cs_timing - configure CS setup, hold, and inactive delays
3694 struct device *parent = spi->controller->dev.parent; in spi_set_cs_timing()
3697 if (spi->controller->set_cs_timing && !spi_get_csgpiod(spi, 0)) { in spi_set_cs_timing()
3698 if (spi->controller->auto_runtime_pm) { in spi_set_cs_timing()
3702 dev_err(&spi->controller->dev, "Failed to power device: %d\n", in spi_set_cs_timing()
3707 status = spi->controller->set_cs_timing(spi); in spi_set_cs_timing()
3711 status = spi->controller->set_cs_timing(spi); in spi_set_cs_timing()
3718 * spi_setup - setup SPI mode and clock rate
3733 * LSB-first wire encoding, or active-high chipselects.
3746 if ((hweight_long(spi->mode & in spi_setup()
3748 (hweight_long(spi->mode & in spi_setup()
3750 dev_err(&spi->dev, in spi_setup()
3751 "setup: can not select any two of dual, quad and no-rx/tx at the same time\n"); in spi_setup()
3752 return -EINVAL; in spi_setup()
3755 if ((spi->mode & SPI_3WIRE) && (spi->mode & in spi_setup()
3758 return -EINVAL; in spi_setup()
3765 bad_bits = spi->mode & ~(spi->controller->mode_bits | SPI_CS_WORD | in spi_setup()
3771 dev_warn(&spi->dev, in spi_setup()
3774 spi->mode &= ~ugly_bits; in spi_setup()
3778 dev_err(&spi->dev, "setup: unsupported mode bits %x\n", in spi_setup()
3780 return -EINVAL; in spi_setup()
3783 if (!spi->bits_per_word) { in spi_setup()
3784 spi->bits_per_word = 8; in spi_setup()
3787 * Some controllers may not support the default 8 bits-per-word in spi_setup()
3790 status = __spi_validate_bits_per_word(spi->controller, in spi_setup()
3791 spi->bits_per_word); in spi_setup()
3796 if (spi->controller->max_speed_hz && in spi_setup()
3797 (!spi->max_speed_hz || in spi_setup()
3798 spi->max_speed_hz > spi->controller->max_speed_hz)) in spi_setup()
3799 spi->max_speed_hz = spi->controller->max_speed_hz; in spi_setup()
3801 mutex_lock(&spi->controller->io_mutex); in spi_setup()
3803 if (spi->controller->setup) { in spi_setup()
3804 status = spi->controller->setup(spi); in spi_setup()
3806 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3807 dev_err(&spi->controller->dev, "Failed to setup device: %d\n", in spi_setup()
3815 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3819 if (spi->controller->auto_runtime_pm && spi->controller->set_cs) { in spi_setup()
3820 status = pm_runtime_resume_and_get(spi->controller->dev.parent); in spi_setup()
3822 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3823 dev_err(&spi->controller->dev, "Failed to power device: %d\n", in spi_setup()
3831 * checking for a non-zero return value instead of a negative in spi_setup()
3837 pm_runtime_mark_last_busy(spi->controller->dev.parent); in spi_setup()
3838 pm_runtime_put_autosuspend(spi->controller->dev.parent); in spi_setup()
3843 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3845 if (spi->rt && !spi->controller->rt) { in spi_setup()
3846 spi->controller->rt = true; in spi_setup()
3847 spi_set_thread_rt(spi->controller); in spi_setup()
3852 dev_dbg(&spi->dev, "setup mode %lu, %s%s%s%s%u bits/w, %u Hz max --> %d\n", in spi_setup()
3853 spi->mode & SPI_MODE_X_MASK, in spi_setup()
3854 (spi->mode & SPI_CS_HIGH) ? "cs_high, " : "", in spi_setup()
3855 (spi->mode & SPI_LSB_FIRST) ? "lsb, " : "", in spi_setup()
3856 (spi->mode & SPI_3WIRE) ? "3wire, " : "", in spi_setup()
3857 (spi->mode & SPI_LOOP) ? "loopback, " : "", in spi_setup()
3858 spi->bits_per_word, spi->max_speed_hz, in spi_setup()
3870 delay1 = spi_delay_to_ns(&xfer->word_delay, xfer); in _spi_xfer_word_delay_update()
3874 delay2 = spi_delay_to_ns(&spi->word_delay, xfer); in _spi_xfer_word_delay_update()
3879 memcpy(&xfer->word_delay, &spi->word_delay, in _spi_xfer_word_delay_update()
3880 sizeof(xfer->word_delay)); in _spi_xfer_word_delay_update()
3887 struct spi_controller *ctlr = spi->controller; in __spi_validate()
3891 if (list_empty(&message->transfers)) in __spi_validate()
3892 return -EINVAL; in __spi_validate()
3896 * transfer (indicated by the SPI_CS_WORD flag) or we are using a GPIO in __spi_validate()
3897 * for the CS line, we can emulate the CS-per-word hardware function by in __spi_validate()
3898 * splitting transfers into one-word transfers and ensuring that in __spi_validate()
3901 if ((spi->mode & SPI_CS_WORD) && (!(ctlr->mode_bits & SPI_CS_WORD) || in __spi_validate()
3903 size_t maxsize = BITS_TO_BYTES(spi->bits_per_word); in __spi_validate()
3906 /* spi_split_transfers_maxsize() requires message->spi */ in __spi_validate()
3907 message->spi = spi; in __spi_validate()
3914 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_validate()
3916 if (list_is_last(&xfer->transfer_list, &message->transfers)) in __spi_validate()
3918 xfer->cs_change = 1; in __spi_validate()
3923 * Half-duplex links include original MicroWire, and ones with in __spi_validate()
3924 * only one data pin like SPI_3WIRE (switches direction) or where in __spi_validate()
3928 if ((ctlr->flags & SPI_CONTROLLER_HALF_DUPLEX) || in __spi_validate()
3929 (spi->mode & SPI_3WIRE)) { in __spi_validate()
3930 unsigned flags = ctlr->flags; in __spi_validate()
3932 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_validate()
3933 if (xfer->rx_buf && xfer->tx_buf) in __spi_validate()
3934 return -EINVAL; in __spi_validate()
3935 if ((flags & SPI_CONTROLLER_NO_TX) && xfer->tx_buf) in __spi_validate()
3936 return -EINVAL; in __spi_validate()
3937 if ((flags & SPI_CONTROLLER_NO_RX) && xfer->rx_buf) in __spi_validate()
3938 return -EINVAL; in __spi_validate()
3950 message->frame_length = 0; in __spi_validate()
3951 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_validate()
3952 xfer->effective_speed_hz = 0; in __spi_validate()
3953 message->frame_length += xfer->len; in __spi_validate()
3954 if (!xfer->bits_per_word) in __spi_validate()
3955 xfer->bits_per_word = spi->bits_per_word; in __spi_validate()
3957 if (!xfer->speed_hz) in __spi_validate()
3958 xfer->speed_hz = spi->max_speed_hz; in __spi_validate()
3960 if (ctlr->max_speed_hz && xfer->speed_hz > ctlr->max_speed_hz) in __spi_validate()
3961 xfer->speed_hz = ctlr->max_speed_hz; in __spi_validate()
3963 if (__spi_validate_bits_per_word(ctlr, xfer->bits_per_word)) in __spi_validate()
3964 return -EINVAL; in __spi_validate()
3968 * where SPI word size should be power-of-two multiple. in __spi_validate()
3970 if (xfer->bits_per_word <= 8) in __spi_validate()
3972 else if (xfer->bits_per_word <= 16) in __spi_validate()
3978 if (xfer->len % w_size) in __spi_validate()
3979 return -EINVAL; in __spi_validate()
3981 if (xfer->speed_hz && ctlr->min_speed_hz && in __spi_validate()
3982 xfer->speed_hz < ctlr->min_speed_hz) in __spi_validate()
3983 return -EINVAL; in __spi_validate()
3985 if (xfer->tx_buf && !xfer->tx_nbits) in __spi_validate()
3986 xfer->tx_nbits = SPI_NBITS_SINGLE; in __spi_validate()
3987 if (xfer->rx_buf && !xfer->rx_nbits) in __spi_validate()
3988 xfer->rx_nbits = SPI_NBITS_SINGLE; in __spi_validate()
3994 if (xfer->tx_buf) { in __spi_validate()
3995 if (spi->mode & SPI_NO_TX) in __spi_validate()
3996 return -EINVAL; in __spi_validate()
3997 if (xfer->tx_nbits != SPI_NBITS_SINGLE && in __spi_validate()
3998 xfer->tx_nbits != SPI_NBITS_DUAL && in __spi_validate()
3999 xfer->tx_nbits != SPI_NBITS_QUAD) in __spi_validate()
4000 return -EINVAL; in __spi_validate()
4001 if ((xfer->tx_nbits == SPI_NBITS_DUAL) && in __spi_validate()
4002 !(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD))) in __spi_validate()
4003 return -EINVAL; in __spi_validate()
4004 if ((xfer->tx_nbits == SPI_NBITS_QUAD) && in __spi_validate()
4005 !(spi->mode & SPI_TX_QUAD)) in __spi_validate()
4006 return -EINVAL; in __spi_validate()
4009 if (xfer->rx_buf) { in __spi_validate()
4010 if (spi->mode & SPI_NO_RX) in __spi_validate()
4011 return -EINVAL; in __spi_validate()
4012 if (xfer->rx_nbits != SPI_NBITS_SINGLE && in __spi_validate()
4013 xfer->rx_nbits != SPI_NBITS_DUAL && in __spi_validate()
4014 xfer->rx_nbits != SPI_NBITS_QUAD) in __spi_validate()
4015 return -EINVAL; in __spi_validate()
4016 if ((xfer->rx_nbits == SPI_NBITS_DUAL) && in __spi_validate()
4017 !(spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD))) in __spi_validate()
4018 return -EINVAL; in __spi_validate()
4019 if ((xfer->rx_nbits == SPI_NBITS_QUAD) && in __spi_validate()
4020 !(spi->mode & SPI_RX_QUAD)) in __spi_validate()
4021 return -EINVAL; in __spi_validate()
4025 return -EINVAL; in __spi_validate()
4028 message->status = -EINPROGRESS; in __spi_validate()
4035 struct spi_controller *ctlr = spi->controller; in __spi_async()
4042 if (!ctlr->transfer) in __spi_async()
4043 return -ENOTSUPP; in __spi_async()
4045 message->spi = spi; in __spi_async()
4047 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_async); in __spi_async()
4048 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_async); in __spi_async()
4052 if (!ctlr->ptp_sts_supported) { in __spi_async()
4053 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_async()
4054 xfer->ptp_sts_word_pre = 0; in __spi_async()
4055 ptp_read_system_prets(xfer->ptp_sts); in __spi_async()
4059 return ctlr->transfer(spi, message); in __spi_async()
4063 * spi_async - asynchronous SPI transfer
4072 * Before that invocation, the value of message->status is undefined.
4073 * When the callback is issued, message->status holds either zero (to
4095 struct spi_controller *ctlr = spi->controller; in spi_async()
4103 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in spi_async()
4105 if (ctlr->bus_lock_flag) in spi_async()
4106 ret = -EBUSY; in spi_async()
4110 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in spi_async()
4117 * spi_async_locked - version of spi_async with exclusive bus usage
4126 * Before that invocation, the value of message->status is undefined.
4127 * When the callback is issued, message->status holds either zero (to
4149 struct spi_controller *ctlr = spi->controller; in spi_async_locked()
4157 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in spi_async_locked()
4161 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in spi_async_locked()
4172 mutex_lock(&ctlr->io_mutex); in __spi_transfer_message_noqueue()
4174 was_busy = ctlr->busy; in __spi_transfer_message_noqueue()
4176 ctlr->cur_msg = msg; in __spi_transfer_message_noqueue()
4179 dev_err(&ctlr->dev, "noqueue transfer failed\n"); in __spi_transfer_message_noqueue()
4180 ctlr->cur_msg = NULL; in __spi_transfer_message_noqueue()
4181 ctlr->fallback = false; in __spi_transfer_message_noqueue()
4184 kfree(ctlr->dummy_rx); in __spi_transfer_message_noqueue()
4185 ctlr->dummy_rx = NULL; in __spi_transfer_message_noqueue()
4186 kfree(ctlr->dummy_tx); in __spi_transfer_message_noqueue()
4187 ctlr->dummy_tx = NULL; in __spi_transfer_message_noqueue()
4188 if (ctlr->unprepare_transfer_hardware && in __spi_transfer_message_noqueue()
4189 ctlr->unprepare_transfer_hardware(ctlr)) in __spi_transfer_message_noqueue()
4190 dev_err(&ctlr->dev, in __spi_transfer_message_noqueue()
4195 mutex_unlock(&ctlr->io_mutex); in __spi_transfer_message_noqueue()
4198 /*-------------------------------------------------------------------------*/
4215 struct spi_controller *ctlr = spi->controller; in __spi_sync()
4218 dev_warn_once(&spi->dev, "Attempted to sync while suspend\n"); in __spi_sync()
4219 return -ESHUTDOWN; in __spi_sync()
4226 message->spi = spi; in __spi_sync()
4228 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_sync); in __spi_sync()
4229 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_sync); in __spi_sync()
4237 if (READ_ONCE(ctlr->queue_empty) && !ctlr->must_async) { in __spi_sync()
4238 message->actual_length = 0; in __spi_sync()
4239 message->status = -EINPROGRESS; in __spi_sync()
4243 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_sync_immediate); in __spi_sync()
4244 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_sync_immediate); in __spi_sync()
4248 return message->status; in __spi_sync()
4257 message->complete = spi_complete; in __spi_sync()
4258 message->context = &done; in __spi_sync()
4262 status = message->status; in __spi_sync()
4264 message->context = NULL; in __spi_sync()
4270 * spi_sync - blocking/synchronous SPI data transfers
4276 * is non-interruptible, and has no timeout. Low-overhead controller
4281 * frequently-used devices may want to minimize costs of selecting a chip,
4294 mutex_lock(&spi->controller->bus_lock_mutex); in spi_sync()
4296 mutex_unlock(&spi->controller->bus_lock_mutex); in spi_sync()
4303 * spi_sync_locked - version of spi_sync with exclusive bus usage
4309 * is non-interruptible, and has no timeout. Low-overhead controller
4325 * spi_bus_lock - obtain a lock for exclusive SPI bus usage
4330 * is non-interruptible, and has no timeout.
4343 mutex_lock(&ctlr->bus_lock_mutex); in spi_bus_lock()
4345 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in spi_bus_lock()
4346 ctlr->bus_lock_flag = 1; in spi_bus_lock()
4347 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in spi_bus_lock()
4356 * spi_bus_unlock - release the lock for exclusive SPI bus usage
4361 * is non-interruptible, and has no timeout.
4370 ctlr->bus_lock_flag = 0; in spi_bus_unlock()
4372 mutex_unlock(&ctlr->bus_lock_mutex); in spi_bus_unlock()
4384 * spi_write_then_read - SPI synchronous write followed by read
4386 * @txbuf: data to be written (need not be DMA-safe)
4388 * @rxbuf: buffer into which data will be read (need not be DMA-safe)
4398 * Performance-sensitive or bulk transfer code should instead use
4399 * spi_{async,sync}() calls with DMA-safe buffers.
4415 * Use preallocated DMA-safe buffer if we can. We can't avoid in spi_write_then_read()
4418 * using the pre-allocated buffer or the transfer is too large. in spi_write_then_read()
4424 return -ENOMEM; in spi_write_then_read()
4458 /*-------------------------------------------------------------------------*/
4493 ctlr = of_find_spi_controller_by_node(rd->dn->parent); in of_spi_notify()
4497 if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) { in of_spi_notify()
4498 put_device(&ctlr->dev); in of_spi_notify()
4506 rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE; in of_spi_notify()
4507 spi = of_register_spi_device(ctlr, rd->dn); in of_spi_notify()
4508 put_device(&ctlr->dev); in of_spi_notify()
4512 __func__, rd->dn); in of_spi_notify()
4513 of_node_clear_flag(rd->dn, OF_POPULATED); in of_spi_notify()
4520 if (!of_node_check_flag(rd->dn, OF_POPULATED)) in of_spi_notify()
4524 spi = of_find_spi_device_by_node(rd->dn); in of_spi_notify()
4532 put_device(&spi->dev); in of_spi_notify()
4549 return ACPI_COMPANION(dev->parent) == data; in spi_acpi_controller_match()
4589 put_device(&ctlr->dev); in acpi_spi_notify()
4600 put_device(&spi->dev); in acpi_spi_notify()
4620 status = -ENOMEM; in spi_init()