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()
618 if (spi->controller == new_spi->controller) { in spi_dev_check()
625 return -EBUSY; in spi_dev_check()
635 if (spi->controller->cleanup) in spi_cleanup()
636 spi->controller->cleanup(spi); in spi_cleanup()
641 struct spi_controller *ctlr = spi->controller; in __spi_add_device()
642 struct device *dev = ctlr->dev.parent; in __spi_add_device()
649 if (cs != 0xFF && cs >= ctlr->num_chipselect) { in __spi_add_device()
651 ctlr->num_chipselect); in __spi_add_device()
652 return -EINVAL; in __spi_add_device()
658 * For example, spi->chip_select[0] != spi->chip_select[1] and so on. in __spi_add_device()
666 return -EBUSY; in __spi_add_device()
685 !device_is_registered(&ctlr->dev)) { in __spi_add_device()
686 return -ENODEV; in __spi_add_device()
689 if (ctlr->cs_gpiods) { in __spi_add_device()
695 spi_set_csgpiod(spi, idx, ctlr->cs_gpiods[cs]); in __spi_add_device()
702 * using SPI_CS_HIGH can't coexist well otherwise... in __spi_add_device()
707 dev_name(&spi->dev), status); in __spi_add_device()
712 status = device_add(&spi->dev); in __spi_add_device()
715 dev_name(&spi->dev), status); in __spi_add_device()
718 dev_dbg(dev, "registered child %s\n", dev_name(&spi->dev)); in __spi_add_device()
725 * spi_add_device - Add spi_device allocated with spi_alloc_device
735 struct spi_controller *ctlr = spi->controller; in spi_add_device()
741 mutex_lock(&ctlr->add_lock); in spi_add_device()
743 mutex_unlock(&ctlr->add_lock); in spi_add_device()
749 * spi_new_device - instantiate one new SPI device
755 * after board init creates the hard-wired devices. Some development
758 * driver could add devices (which it would learn about out-of-band).
770 * NOTE: caller did any chip->bus_num checks necessary. in spi_new_device()
773 * error-or-pointer (not NULL-or-pointer), troubleshootability in spi_new_device()
781 WARN_ON(strlen(chip->modalias) >= sizeof(proxy->modalias)); in spi_new_device()
785 * logical CS in the spi->chip_select[]. If all the physical CS in spi_new_device()
795 spi_set_chipselect(proxy, 0, chip->chip_select); in spi_new_device()
796 proxy->max_speed_hz = chip->max_speed_hz; in spi_new_device()
797 proxy->mode = chip->mode; in spi_new_device()
798 proxy->irq = chip->irq; in spi_new_device()
799 strscpy(proxy->modalias, chip->modalias, sizeof(proxy->modalias)); in spi_new_device()
800 proxy->dev.platform_data = (void *) chip->platform_data; in spi_new_device()
801 proxy->controller_data = chip->controller_data; in spi_new_device()
802 proxy->controller_state = NULL; in spi_new_device()
804 * spi->chip_select[i] gives the corresponding physical CS for logical CS i in spi_new_device()
805 * logical CS number is represented by setting the ith bit in spi->cs_index_mask in spi_new_device()
806 * So, for example, if spi->cs_index_mask = 0x01 then logical CS number is 0 and in spi_new_device()
807 * spi->chip_select[0] will give the physical CS. in spi_new_device()
808 * By default spi->chip_select[0] will hold the physical CS number so, set in spi_new_device()
809 * spi->cs_index_mask as 0x01. in spi_new_device()
811 proxy->cs_index_mask = 0x01; in spi_new_device()
813 if (chip->swnode) { in spi_new_device()
814 status = device_add_software_node(&proxy->dev, chip->swnode); in spi_new_device()
816 dev_err(&ctlr->dev, "failed to add software node to '%s': %d\n", in spi_new_device()
817 chip->modalias, status); in spi_new_device()
829 device_remove_software_node(&proxy->dev); in spi_new_device()
836 * spi_unregister_device - unregister a single SPI device
847 if (spi->dev.of_node) { in spi_unregister_device()
848 of_node_clear_flag(spi->dev.of_node, OF_POPULATED); in spi_unregister_device()
849 of_node_put(spi->dev.of_node); in spi_unregister_device()
851 if (ACPI_COMPANION(&spi->dev)) in spi_unregister_device()
852 acpi_device_clear_enumerated(ACPI_COMPANION(&spi->dev)); in spi_unregister_device()
853 device_remove_software_node(&spi->dev); in spi_unregister_device()
854 device_del(&spi->dev); in spi_unregister_device()
856 put_device(&spi->dev); in spi_unregister_device()
865 if (ctlr->bus_num != bi->bus_num) in spi_match_controller_to_boardinfo()
870 dev_err(ctlr->dev.parent, "can't create new device for %s\n", in spi_match_controller_to_boardinfo()
871 bi->modalias); in spi_match_controller_to_boardinfo()
875 * spi_register_board_info - register SPI devices for a given board
880 * Board-specific early init code calls this (probably during arch_initcall)
884 * not make Linux forget about these hard-wired devices.
886 * Other code can also call this, e.g. a particular add-on board might provide
891 * any embedded pointers (platform_data, etc), they're copied as-is.
905 return -ENOMEM; in spi_register_board_info()
910 memcpy(&bi->board_info, info, sizeof(*info)); in spi_register_board_info()
913 list_add_tail(&bi->list, &board_list); in spi_register_board_info()
916 &bi->board_info); in spi_register_board_info()
923 /*-------------------------------------------------------------------------*/
928 * spi_res_alloc - allocate a spi resource that is life-cycle managed
950 INIT_LIST_HEAD(&sres->entry); in spi_res_alloc()
951 sres->release = release; in spi_res_alloc()
953 return sres->data; in spi_res_alloc()
957 * spi_res_free - free an SPI resource
967 WARN_ON(!list_empty(&sres->entry)); in spi_res_free()
972 * spi_res_add - add a spi_res to the spi_message
980 WARN_ON(!list_empty(&sres->entry)); in spi_res_add()
981 list_add_tail(&sres->entry, &message->resources); in spi_res_add()
985 * spi_res_release - release all SPI resources for this message
993 list_for_each_entry_safe_reverse(res, tmp, &message->resources, entry) { in spi_res_release()
994 if (res->release) in spi_res_release()
995 res->release(ctlr, message, res->data); in spi_res_release()
997 list_del(&res->entry); in spi_res_release()
1003 /*-------------------------------------------------------------------------*/
1010 if ((spi->cs_index_mask >> idx) & 0x01) { in spi_is_last_cs()
1011 if (spi->controller->last_cs[idx] == spi_get_chipselect(spi, idx)) in spi_is_last_cs()
1028 if (!force && ((enable && spi->controller->last_cs_index_mask == spi->cs_index_mask && in spi_set_cs()
1030 (!enable && spi->controller->last_cs_index_mask == spi->cs_index_mask && in spi_set_cs()
1032 (spi->controller->last_cs_mode_high == (spi->mode & SPI_CS_HIGH))) in spi_set_cs()
1037 spi->controller->last_cs_index_mask = spi->cs_index_mask; in spi_set_cs()
1039 spi->controller->last_cs[idx] = enable ? spi_get_chipselect(spi, 0) : -1; in spi_set_cs()
1040 spi->controller->last_cs_mode_high = spi->mode & SPI_CS_HIGH; in spi_set_cs()
1042 if (spi->mode & SPI_CS_HIGH) in spi_set_cs()
1046 if (!spi->controller->set_cs_timing && !activate) in spi_set_cs()
1047 spi_delay_exec(&spi->cs_hold, NULL); in spi_set_cs()
1049 if (!(spi->mode & SPI_NO_CS)) { in spi_set_cs()
1051 * Historically ACPI has no means of the GPIO polarity and in spi_set_cs()
1052 * thus the SPISerialBus() resource defines it on the per-chip in spi_set_cs()
1053 * basis. In order to avoid a chain of negations, the GPIO in spi_set_cs()
1056 * the GPIO CS polarity must be defined Active High to avoid in spi_set_cs()
1061 if (((spi->cs_index_mask >> idx) & 0x01) && in spi_set_cs()
1063 if (has_acpi_companion(&spi->dev)) in spi_set_cs()
1067 /* Polarity handled by GPIO library */ in spi_set_cs()
1072 spi_delay_exec(&spi->cs_setup, NULL); in spi_set_cs()
1074 spi_delay_exec(&spi->cs_inactive, NULL); in spi_set_cs()
1078 /* Some SPI masters need both GPIO CS & slave_select */ in spi_set_cs()
1079 if ((spi->controller->flags & SPI_CONTROLLER_GPIO_SS) && in spi_set_cs()
1080 spi->controller->set_cs) in spi_set_cs()
1081 spi->controller->set_cs(spi, !enable); in spi_set_cs()
1083 if (!spi->controller->set_cs_timing) { in spi_set_cs()
1085 spi_delay_exec(&spi->cs_setup, NULL); in spi_set_cs()
1087 spi_delay_exec(&spi->cs_inactive, NULL); in spi_set_cs()
1089 } else if (spi->controller->set_cs) { in spi_set_cs()
1090 spi->controller->set_cs(spi, !enable); in spi_set_cs()
1120 desc_len = min_t(size_t, max_seg_size, ctlr->max_dma_len); in spi_map_buf_attrs()
1123 return -EINVAL; in spi_map_buf_attrs()
1130 sg = &sgt->sgl[0]; in spi_map_buf_attrs()
1141 PAGE_SIZE - offset_in_page(buf))); in spi_map_buf_attrs()
1148 return -ENOMEM; in spi_map_buf_attrs()
1159 len -= min; in spi_map_buf_attrs()
1184 if (sgt->orig_nents) { in spi_unmap_buf_attrs()
1187 sgt->orig_nents = 0; in spi_unmap_buf_attrs()
1188 sgt->nents = 0; in spi_unmap_buf_attrs()
1204 if (!ctlr->can_dma) in __spi_map_msg()
1207 if (ctlr->dma_tx) in __spi_map_msg()
1208 tx_dev = ctlr->dma_tx->device->dev; in __spi_map_msg()
1209 else if (ctlr->dma_map_dev) in __spi_map_msg()
1210 tx_dev = ctlr->dma_map_dev; in __spi_map_msg()
1212 tx_dev = ctlr->dev.parent; in __spi_map_msg()
1214 if (ctlr->dma_rx) in __spi_map_msg()
1215 rx_dev = ctlr->dma_rx->device->dev; in __spi_map_msg()
1216 else if (ctlr->dma_map_dev) in __spi_map_msg()
1217 rx_dev = ctlr->dma_map_dev; in __spi_map_msg()
1219 rx_dev = ctlr->dev.parent; in __spi_map_msg()
1221 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_map_msg()
1225 if (!ctlr->can_dma(ctlr, msg->spi, xfer)) in __spi_map_msg()
1228 if (xfer->tx_buf != NULL) { in __spi_map_msg()
1229 ret = spi_map_buf_attrs(ctlr, tx_dev, &xfer->tx_sg, in __spi_map_msg()
1230 (void *)xfer->tx_buf, in __spi_map_msg()
1231 xfer->len, DMA_TO_DEVICE, in __spi_map_msg()
1237 if (xfer->rx_buf != NULL) { in __spi_map_msg()
1238 ret = spi_map_buf_attrs(ctlr, rx_dev, &xfer->rx_sg, in __spi_map_msg()
1239 xfer->rx_buf, xfer->len, in __spi_map_msg()
1243 &xfer->tx_sg, DMA_TO_DEVICE, in __spi_map_msg()
1251 ctlr->cur_rx_dma_dev = rx_dev; in __spi_map_msg()
1252 ctlr->cur_tx_dma_dev = tx_dev; in __spi_map_msg()
1253 ctlr->cur_msg_mapped = true; in __spi_map_msg()
1260 struct device *rx_dev = ctlr->cur_rx_dma_dev; in __spi_unmap_msg()
1261 struct device *tx_dev = ctlr->cur_tx_dma_dev; in __spi_unmap_msg()
1264 if (!ctlr->cur_msg_mapped || !ctlr->can_dma) in __spi_unmap_msg()
1267 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_unmap_msg()
1271 if (!ctlr->can_dma(ctlr, msg->spi, xfer)) in __spi_unmap_msg()
1274 spi_unmap_buf_attrs(ctlr, rx_dev, &xfer->rx_sg, in __spi_unmap_msg()
1276 spi_unmap_buf_attrs(ctlr, tx_dev, &xfer->tx_sg, in __spi_unmap_msg()
1280 ctlr->cur_msg_mapped = false; in __spi_unmap_msg()
1288 struct device *rx_dev = ctlr->cur_rx_dma_dev; in spi_dma_sync_for_device()
1289 struct device *tx_dev = ctlr->cur_tx_dma_dev; in spi_dma_sync_for_device()
1291 if (!ctlr->cur_msg_mapped) in spi_dma_sync_for_device()
1294 if (xfer->tx_sg.orig_nents) in spi_dma_sync_for_device()
1295 dma_sync_sgtable_for_device(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE); in spi_dma_sync_for_device()
1296 if (xfer->rx_sg.orig_nents) in spi_dma_sync_for_device()
1297 dma_sync_sgtable_for_device(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE); in spi_dma_sync_for_device()
1303 struct device *rx_dev = ctlr->cur_rx_dma_dev; in spi_dma_sync_for_cpu()
1304 struct device *tx_dev = ctlr->cur_tx_dma_dev; in spi_dma_sync_for_cpu()
1306 if (!ctlr->cur_msg_mapped) in spi_dma_sync_for_cpu()
1309 if (xfer->rx_sg.orig_nents) in spi_dma_sync_for_cpu()
1310 dma_sync_sgtable_for_cpu(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE); in spi_dma_sync_for_cpu()
1311 if (xfer->tx_sg.orig_nents) in spi_dma_sync_for_cpu()
1312 dma_sync_sgtable_for_cpu(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE); in spi_dma_sync_for_cpu()
1343 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_unmap_msg()
1348 if (xfer->tx_buf == ctlr->dummy_tx) in spi_unmap_msg()
1349 xfer->tx_buf = NULL; in spi_unmap_msg()
1350 if (xfer->rx_buf == ctlr->dummy_rx) in spi_unmap_msg()
1351 xfer->rx_buf = NULL; in spi_unmap_msg()
1363 if ((ctlr->flags & (SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX)) in spi_map_msg()
1364 && !(msg->spi->mode & SPI_3WIRE)) { in spi_map_msg()
1368 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_map_msg()
1369 if ((ctlr->flags & SPI_CONTROLLER_MUST_TX) && in spi_map_msg()
1370 !xfer->tx_buf) in spi_map_msg()
1371 max_tx = max(xfer->len, max_tx); in spi_map_msg()
1372 if ((ctlr->flags & SPI_CONTROLLER_MUST_RX) && in spi_map_msg()
1373 !xfer->rx_buf) in spi_map_msg()
1374 max_rx = max(xfer->len, max_rx); in spi_map_msg()
1378 tmp = krealloc(ctlr->dummy_tx, max_tx, in spi_map_msg()
1381 return -ENOMEM; in spi_map_msg()
1382 ctlr->dummy_tx = tmp; in spi_map_msg()
1386 tmp = krealloc(ctlr->dummy_rx, max_rx, in spi_map_msg()
1389 return -ENOMEM; in spi_map_msg()
1390 ctlr->dummy_rx = tmp; in spi_map_msg()
1394 list_for_each_entry(xfer, &msg->transfers, in spi_map_msg()
1396 if (!xfer->len) in spi_map_msg()
1398 if (!xfer->tx_buf) in spi_map_msg()
1399 xfer->tx_buf = ctlr->dummy_tx; in spi_map_msg()
1400 if (!xfer->rx_buf) in spi_map_msg()
1401 xfer->rx_buf = ctlr->dummy_rx; in spi_map_msg()
1413 struct spi_statistics __percpu *statm = ctlr->pcpu_statistics; in spi_transfer_wait()
1414 struct spi_statistics __percpu *stats = msg->spi->pcpu_statistics; in spi_transfer_wait()
1415 u32 speed_hz = xfer->speed_hz; in spi_transfer_wait()
1419 if (wait_for_completion_interruptible(&ctlr->xfer_completion)) { in spi_transfer_wait()
1420 dev_dbg(&msg->spi->dev, "SPI transfer interrupted\n"); in spi_transfer_wait()
1421 return -EINTR; in spi_transfer_wait()
1433 ms = 8LL * MSEC_PER_SEC * xfer->len; in spi_transfer_wait()
1444 ms = wait_for_completion_timeout(&ctlr->xfer_completion, in spi_transfer_wait()
1450 dev_err(&msg->spi->dev, in spi_transfer_wait()
1452 return -ETIMEDOUT; in spi_transfer_wait()
1455 if (xfer->error & SPI_TRANS_FAIL_IO) in spi_transfer_wait()
1456 return -EIO; in spi_transfer_wait()
1480 u32 delay = _delay->value; in spi_delay_to_ns()
1481 u32 unit = _delay->unit; in spi_delay_to_ns()
1497 return -EINVAL; in spi_delay_to_ns()
1502 hz = xfer->effective_speed_hz ?: xfer->speed_hz / 2; in spi_delay_to_ns()
1504 return -EINVAL; in spi_delay_to_ns()
1510 return -EINVAL; in spi_delay_to_ns()
1524 return -EINVAL; in spi_delay_exec()
1540 u32 delay = xfer->cs_change_delay.value; in _spi_transfer_cs_change_delay()
1541 u32 unit = xfer->cs_change_delay.unit; in _spi_transfer_cs_change_delay()
1544 /* Return early on "fast" mode - for everything but USECS */ in _spi_transfer_cs_change_delay()
1551 ret = spi_delay_exec(&xfer->cs_change_delay, xfer); in _spi_transfer_cs_change_delay()
1553 dev_err_once(&msg->spi->dev, in _spi_transfer_cs_change_delay()
1568 * spi_transfer_one_message - Default implementation of transfer_one_message()
1580 struct spi_statistics __percpu *statm = ctlr->pcpu_statistics; in spi_transfer_one_message()
1581 struct spi_statistics __percpu *stats = msg->spi->pcpu_statistics; in spi_transfer_one_message()
1583 xfer = list_first_entry(&msg->transfers, struct spi_transfer, transfer_list); in spi_transfer_one_message()
1584 spi_set_cs(msg->spi, !xfer->cs_off, false); in spi_transfer_one_message()
1589 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_transfer_one_message()
1595 if (!ctlr->ptp_sts_supported) { in spi_transfer_one_message()
1596 xfer->ptp_sts_word_pre = 0; in spi_transfer_one_message()
1597 ptp_read_system_prets(xfer->ptp_sts); in spi_transfer_one_message()
1600 if ((xfer->tx_buf || xfer->rx_buf) && xfer->len) { in spi_transfer_one_message()
1601 reinit_completion(&ctlr->xfer_completion); in spi_transfer_one_message()
1605 ret = ctlr->transfer_one(ctlr, msg->spi, xfer); in spi_transfer_one_message()
1609 if (ctlr->cur_msg_mapped && in spi_transfer_one_message()
1610 (xfer->error & SPI_TRANS_FAIL_NO_START)) { in spi_transfer_one_message()
1612 ctlr->fallback = true; in spi_transfer_one_message()
1613 xfer->error &= ~SPI_TRANS_FAIL_NO_START; in spi_transfer_one_message()
1621 dev_err(&msg->spi->dev, in spi_transfer_one_message()
1629 msg->status = ret; in spi_transfer_one_message()
1634 if (xfer->len) in spi_transfer_one_message()
1635 dev_err(&msg->spi->dev, in spi_transfer_one_message()
1637 xfer->len); in spi_transfer_one_message()
1640 if (!ctlr->ptp_sts_supported) { in spi_transfer_one_message()
1641 ptp_read_system_postts(xfer->ptp_sts); in spi_transfer_one_message()
1642 xfer->ptp_sts_word_post = xfer->len; in spi_transfer_one_message()
1647 if (msg->status != -EINPROGRESS) in spi_transfer_one_message()
1652 if (xfer->cs_change) { in spi_transfer_one_message()
1653 if (list_is_last(&xfer->transfer_list, in spi_transfer_one_message()
1654 &msg->transfers)) { in spi_transfer_one_message()
1657 if (!xfer->cs_off) in spi_transfer_one_message()
1658 spi_set_cs(msg->spi, false, false); in spi_transfer_one_message()
1660 if (!list_next_entry(xfer, transfer_list)->cs_off) in spi_transfer_one_message()
1661 spi_set_cs(msg->spi, true, false); in spi_transfer_one_message()
1663 } else if (!list_is_last(&xfer->transfer_list, &msg->transfers) && in spi_transfer_one_message()
1664 xfer->cs_off != list_next_entry(xfer, transfer_list)->cs_off) { in spi_transfer_one_message()
1665 spi_set_cs(msg->spi, xfer->cs_off, false); in spi_transfer_one_message()
1668 msg->actual_length += xfer->len; in spi_transfer_one_message()
1673 spi_set_cs(msg->spi, false, false); in spi_transfer_one_message()
1675 if (msg->status == -EINPROGRESS) in spi_transfer_one_message()
1676 msg->status = ret; in spi_transfer_one_message()
1678 if (msg->status && ctlr->handle_err) in spi_transfer_one_message()
1679 ctlr->handle_err(ctlr, msg); in spi_transfer_one_message()
1687 * spi_finalize_current_transfer - report completion of a transfer
1696 complete(&ctlr->xfer_completion); in spi_finalize_current_transfer()
1702 if (ctlr->auto_runtime_pm) { in spi_idle_runtime_pm()
1703 pm_runtime_mark_last_busy(ctlr->dev.parent); in spi_idle_runtime_pm()
1704 pm_runtime_put_autosuspend(ctlr->dev.parent); in spi_idle_runtime_pm()
1714 if (!was_busy && ctlr->auto_runtime_pm) { in __spi_pump_transfer_message()
1715 ret = pm_runtime_get_sync(ctlr->dev.parent); in __spi_pump_transfer_message()
1717 pm_runtime_put_noidle(ctlr->dev.parent); in __spi_pump_transfer_message()
1718 dev_err(&ctlr->dev, "Failed to power device: %d\n", in __spi_pump_transfer_message()
1721 msg->status = ret; in __spi_pump_transfer_message()
1731 if (!was_busy && ctlr->prepare_transfer_hardware) { in __spi_pump_transfer_message()
1732 ret = ctlr->prepare_transfer_hardware(ctlr); in __spi_pump_transfer_message()
1734 dev_err(&ctlr->dev, in __spi_pump_transfer_message()
1738 if (ctlr->auto_runtime_pm) in __spi_pump_transfer_message()
1739 pm_runtime_put(ctlr->dev.parent); in __spi_pump_transfer_message()
1741 msg->status = ret; in __spi_pump_transfer_message()
1751 spi_max_transfer_size(msg->spi), in __spi_pump_transfer_message()
1754 msg->status = ret; in __spi_pump_transfer_message()
1759 if (ctlr->prepare_message) { in __spi_pump_transfer_message()
1760 ret = ctlr->prepare_message(ctlr, msg); in __spi_pump_transfer_message()
1762 dev_err(&ctlr->dev, "failed to prepare message: %d\n", in __spi_pump_transfer_message()
1764 msg->status = ret; in __spi_pump_transfer_message()
1768 msg->prepared = true; in __spi_pump_transfer_message()
1773 msg->status = ret; in __spi_pump_transfer_message()
1778 if (!ctlr->ptp_sts_supported && !ctlr->transfer_one) { in __spi_pump_transfer_message()
1779 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_pump_transfer_message()
1780 xfer->ptp_sts_word_pre = 0; in __spi_pump_transfer_message()
1781 ptp_read_system_prets(xfer->ptp_sts); in __spi_pump_transfer_message()
1791 * ctlr->cur_msg. in __spi_pump_transfer_message()
1798 WRITE_ONCE(ctlr->cur_msg_incomplete, true); in __spi_pump_transfer_message()
1799 WRITE_ONCE(ctlr->cur_msg_need_completion, false); in __spi_pump_transfer_message()
1800 reinit_completion(&ctlr->cur_msg_completion); in __spi_pump_transfer_message()
1803 ret = ctlr->transfer_one_message(ctlr, msg); in __spi_pump_transfer_message()
1805 dev_err(&ctlr->dev, in __spi_pump_transfer_message()
1810 WRITE_ONCE(ctlr->cur_msg_need_completion, true); in __spi_pump_transfer_message()
1812 if (READ_ONCE(ctlr->cur_msg_incomplete)) in __spi_pump_transfer_message()
1813 wait_for_completion(&ctlr->cur_msg_completion); in __spi_pump_transfer_message()
1819 * __spi_pump_messages - function which processes SPI message queue
1839 mutex_lock(&ctlr->io_mutex); in __spi_pump_messages()
1842 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_pump_messages()
1845 if (ctlr->cur_msg) in __spi_pump_messages()
1849 if (list_empty(&ctlr->queue) || !ctlr->running) { in __spi_pump_messages()
1850 if (!ctlr->busy) in __spi_pump_messages()
1853 /* Defer any non-atomic teardown to the thread */ in __spi_pump_messages()
1855 if (!ctlr->dummy_rx && !ctlr->dummy_tx && in __spi_pump_messages()
1856 !ctlr->unprepare_transfer_hardware) { in __spi_pump_messages()
1858 ctlr->busy = false; in __spi_pump_messages()
1859 ctlr->queue_empty = true; in __spi_pump_messages()
1862 kthread_queue_work(ctlr->kworker, in __spi_pump_messages()
1863 &ctlr->pump_messages); in __spi_pump_messages()
1868 ctlr->busy = false; in __spi_pump_messages()
1869 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1871 kfree(ctlr->dummy_rx); in __spi_pump_messages()
1872 ctlr->dummy_rx = NULL; in __spi_pump_messages()
1873 kfree(ctlr->dummy_tx); in __spi_pump_messages()
1874 ctlr->dummy_tx = NULL; in __spi_pump_messages()
1875 if (ctlr->unprepare_transfer_hardware && in __spi_pump_messages()
1876 ctlr->unprepare_transfer_hardware(ctlr)) in __spi_pump_messages()
1877 dev_err(&ctlr->dev, in __spi_pump_messages()
1882 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_pump_messages()
1883 ctlr->queue_empty = true; in __spi_pump_messages()
1888 msg = list_first_entry(&ctlr->queue, struct spi_message, queue); in __spi_pump_messages()
1889 ctlr->cur_msg = msg; in __spi_pump_messages()
1891 list_del_init(&msg->queue); in __spi_pump_messages()
1892 if (ctlr->busy) in __spi_pump_messages()
1895 ctlr->busy = true; in __spi_pump_messages()
1896 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1899 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in __spi_pump_messages()
1901 ctlr->cur_msg = NULL; in __spi_pump_messages()
1902 ctlr->fallback = false; in __spi_pump_messages()
1904 mutex_unlock(&ctlr->io_mutex); in __spi_pump_messages()
1912 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1913 mutex_unlock(&ctlr->io_mutex); in __spi_pump_messages()
1917 * spi_pump_messages - kthread work function which processes spi message queue
1929 * spi_take_timestamp_pre - helper to collect the beginning of the TX timestamp
1952 if (!xfer->ptp_sts) in spi_take_timestamp_pre()
1955 if (xfer->timestamped) in spi_take_timestamp_pre()
1958 if (progress > xfer->ptp_sts_word_pre) in spi_take_timestamp_pre()
1962 xfer->ptp_sts_word_pre = progress; in spi_take_timestamp_pre()
1965 local_irq_save(ctlr->irq_flags); in spi_take_timestamp_pre()
1969 ptp_read_system_prets(xfer->ptp_sts); in spi_take_timestamp_pre()
1974 * spi_take_timestamp_post - helper to collect the end of the TX timestamp
1978 * @irqs_off: If true, will re-enable IRQs and preemption for the local CPU.
1989 if (!xfer->ptp_sts) in spi_take_timestamp_post()
1992 if (xfer->timestamped) in spi_take_timestamp_post()
1995 if (progress < xfer->ptp_sts_word_post) in spi_take_timestamp_post()
1998 ptp_read_system_postts(xfer->ptp_sts); in spi_take_timestamp_post()
2001 local_irq_restore(ctlr->irq_flags); in spi_take_timestamp_post()
2006 xfer->ptp_sts_word_post = progress; in spi_take_timestamp_post()
2008 xfer->timestamped = 1; in spi_take_timestamp_post()
2013 * spi_set_thread_rt - set the controller to pump at realtime priority
2017 * (by setting the ->rt value before calling spi_register_controller()) or
2029 dev_info(&ctlr->dev, in spi_set_thread_rt()
2031 sched_set_fifo(ctlr->kworker->task); in spi_set_thread_rt()
2036 ctlr->running = false; in spi_init_queue()
2037 ctlr->busy = false; in spi_init_queue()
2038 ctlr->queue_empty = true; in spi_init_queue()
2040 ctlr->kworker = kthread_create_worker(0, dev_name(&ctlr->dev)); in spi_init_queue()
2041 if (IS_ERR(ctlr->kworker)) { in spi_init_queue()
2042 dev_err(&ctlr->dev, "failed to create message pump kworker\n"); in spi_init_queue()
2043 return PTR_ERR(ctlr->kworker); in spi_init_queue()
2046 kthread_init_work(&ctlr->pump_messages, spi_pump_messages); in spi_init_queue()
2055 if (ctlr->rt) in spi_init_queue()
2062 * spi_get_next_queued_message() - called by driver to check for queued
2077 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_get_next_queued_message()
2078 next = list_first_entry_or_null(&ctlr->queue, struct spi_message, in spi_get_next_queued_message()
2080 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_get_next_queued_message()
2087 * spi_finalize_current_message() - the current message is complete
2099 mesg = ctlr->cur_msg; in spi_finalize_current_message()
2101 if (!ctlr->ptp_sts_supported && !ctlr->transfer_one) { in spi_finalize_current_message()
2102 list_for_each_entry(xfer, &mesg->transfers, transfer_list) { in spi_finalize_current_message()
2103 ptp_read_system_postts(xfer->ptp_sts); in spi_finalize_current_message()
2104 xfer->ptp_sts_word_post = xfer->len; in spi_finalize_current_message()
2108 if (unlikely(ctlr->ptp_sts_supported)) in spi_finalize_current_message()
2109 list_for_each_entry(xfer, &mesg->transfers, transfer_list) in spi_finalize_current_message()
2110 WARN_ON_ONCE(xfer->ptp_sts && !xfer->timestamped); in spi_finalize_current_message()
2123 if (mesg->prepared && ctlr->unprepare_message) { in spi_finalize_current_message()
2124 ret = ctlr->unprepare_message(ctlr, mesg); in spi_finalize_current_message()
2126 dev_err(&ctlr->dev, "failed to unprepare message: %d\n", in spi_finalize_current_message()
2131 mesg->prepared = false; in spi_finalize_current_message()
2133 WRITE_ONCE(ctlr->cur_msg_incomplete, false); in spi_finalize_current_message()
2135 if (READ_ONCE(ctlr->cur_msg_need_completion)) in spi_finalize_current_message()
2136 complete(&ctlr->cur_msg_completion); in spi_finalize_current_message()
2140 mesg->state = NULL; in spi_finalize_current_message()
2141 if (mesg->complete) in spi_finalize_current_message()
2142 mesg->complete(mesg->context); in spi_finalize_current_message()
2150 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_start_queue()
2152 if (ctlr->running || ctlr->busy) { in spi_start_queue()
2153 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_start_queue()
2154 return -EBUSY; in spi_start_queue()
2157 ctlr->running = true; in spi_start_queue()
2158 ctlr->cur_msg = NULL; in spi_start_queue()
2159 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_start_queue()
2161 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in spi_start_queue()
2172 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_stop_queue()
2176 * A wait_queue on the ctlr->busy could be used, but then the common in spi_stop_queue()
2180 while ((!list_empty(&ctlr->queue) || ctlr->busy) && limit--) { in spi_stop_queue()
2181 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_stop_queue()
2183 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_stop_queue()
2186 if (!list_empty(&ctlr->queue) || ctlr->busy) in spi_stop_queue()
2187 ret = -EBUSY; in spi_stop_queue()
2189 ctlr->running = false; in spi_stop_queue()
2191 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_stop_queue()
2209 dev_err(&ctlr->dev, "problem destroying queue\n"); in spi_destroy_queue()
2213 kthread_destroy_worker(ctlr->kworker); in spi_destroy_queue()
2222 struct spi_controller *ctlr = spi->controller; in __spi_queued_transfer()
2225 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2227 if (!ctlr->running) { in __spi_queued_transfer()
2228 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2229 return -ESHUTDOWN; in __spi_queued_transfer()
2231 msg->actual_length = 0; in __spi_queued_transfer()
2232 msg->status = -EINPROGRESS; in __spi_queued_transfer()
2234 list_add_tail(&msg->queue, &ctlr->queue); in __spi_queued_transfer()
2235 ctlr->queue_empty = false; in __spi_queued_transfer()
2236 if (!ctlr->busy && need_pump) in __spi_queued_transfer()
2237 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in __spi_queued_transfer()
2239 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2244 * spi_queued_transfer - transfer function for queued transfers
2259 ctlr->transfer = spi_queued_transfer; in spi_controller_initialize_queue()
2260 if (!ctlr->transfer_one_message) in spi_controller_initialize_queue()
2261 ctlr->transfer_one_message = spi_transfer_one_message; in spi_controller_initialize_queue()
2266 dev_err(&ctlr->dev, "problem initializing queue\n"); in spi_controller_initialize_queue()
2269 ctlr->queued = true; in spi_controller_initialize_queue()
2272 dev_err(&ctlr->dev, "problem starting queue\n"); in spi_controller_initialize_queue()
2285 * spi_flush_queue - Send all pending messages in the queue from the callers'
2290 * sent before doing something. Is used by the spi-mem code to make sure SPI
2292 * before the spi-mem operation.
2296 if (ctlr->transfer == spi_queued_transfer) in spi_flush_queue()
2300 /*-------------------------------------------------------------------------*/
2310 delay->value = DIV_ROUND_UP(value, 1000); in of_spi_parse_dt_cs_delay()
2311 delay->unit = SPI_DELAY_UNIT_USECS; in of_spi_parse_dt_cs_delay()
2313 delay->value = value; in of_spi_parse_dt_cs_delay()
2314 delay->unit = SPI_DELAY_UNIT_NSECS; in of_spi_parse_dt_cs_delay()
2326 if (of_property_read_bool(nc, "spi-cpha")) in of_spi_parse_dt()
2327 spi->mode |= SPI_CPHA; in of_spi_parse_dt()
2328 if (of_property_read_bool(nc, "spi-cpol")) in of_spi_parse_dt()
2329 spi->mode |= SPI_CPOL; in of_spi_parse_dt()
2330 if (of_property_read_bool(nc, "spi-3wire")) in of_spi_parse_dt()
2331 spi->mode |= SPI_3WIRE; in of_spi_parse_dt()
2332 if (of_property_read_bool(nc, "spi-lsb-first")) in of_spi_parse_dt()
2333 spi->mode |= SPI_LSB_FIRST; in of_spi_parse_dt()
2334 if (of_property_read_bool(nc, "spi-cs-high")) in of_spi_parse_dt()
2335 spi->mode |= SPI_CS_HIGH; in of_spi_parse_dt()
2338 if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { in of_spi_parse_dt()
2341 spi->mode |= SPI_NO_TX; in of_spi_parse_dt()
2346 spi->mode |= SPI_TX_DUAL; in of_spi_parse_dt()
2349 spi->mode |= SPI_TX_QUAD; in of_spi_parse_dt()
2352 spi->mode |= SPI_TX_OCTAL; in of_spi_parse_dt()
2355 dev_warn(&ctlr->dev, in of_spi_parse_dt()
2356 "spi-tx-bus-width %d not supported\n", in of_spi_parse_dt()
2362 if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) { in of_spi_parse_dt()
2365 spi->mode |= SPI_NO_RX; in of_spi_parse_dt()
2370 spi->mode |= SPI_RX_DUAL; in of_spi_parse_dt()
2373 spi->mode |= SPI_RX_QUAD; in of_spi_parse_dt()
2376 spi->mode |= SPI_RX_OCTAL; in of_spi_parse_dt()
2379 dev_warn(&ctlr->dev, in of_spi_parse_dt()
2380 "spi-rx-bus-width %d not supported\n", in of_spi_parse_dt()
2388 dev_err(&ctlr->dev, "%pOF is not called 'slave'\n", in of_spi_parse_dt()
2390 return -EINVAL; in of_spi_parse_dt()
2395 if (ctlr->num_chipselect > SPI_CS_CNT_MAX) { in of_spi_parse_dt()
2396 dev_err(&ctlr->dev, "No. of CS is more than max. no. of supported CS\n"); in of_spi_parse_dt()
2397 return -EINVAL; in of_spi_parse_dt()
2402 * logical CS in the spi->chip_select[]. If all the physical CS in of_spi_parse_dt()
2416 dev_err(&ctlr->dev, "%pOF has no valid 'reg' property (%d)\n", in of_spi_parse_dt()
2420 if (rc > ctlr->num_chipselect) { in of_spi_parse_dt()
2421 dev_err(&ctlr->dev, "%pOF has number of CS > ctlr->num_chipselect (%d)\n", in of_spi_parse_dt()
2425 if ((of_property_read_bool(nc, "parallel-memories")) && in of_spi_parse_dt()
2426 (!(ctlr->flags & SPI_CONTROLLER_MULTI_CS))) { in of_spi_parse_dt()
2427 dev_err(&ctlr->dev, "SPI controller doesn't support multi CS\n"); in of_spi_parse_dt()
2428 return -EINVAL; in of_spi_parse_dt()
2434 * spi->chip_select[i] gives the corresponding physical CS for logical CS i in of_spi_parse_dt()
2435 * logical CS number is represented by setting the ith bit in spi->cs_index_mask in of_spi_parse_dt()
2436 * So, for example, if spi->cs_index_mask = 0x01 then logical CS number is 0 and in of_spi_parse_dt()
2437 * spi->chip_select[0] will give the physical CS. in of_spi_parse_dt()
2438 * By default spi->chip_select[0] will hold the physical CS number so, set in of_spi_parse_dt()
2439 * spi->cs_index_mask as 0x01. in of_spi_parse_dt()
2441 spi->cs_index_mask = 0x01; in of_spi_parse_dt()
2444 if (!of_property_read_u32(nc, "spi-max-frequency", &value)) in of_spi_parse_dt()
2445 spi->max_speed_hz = value; in of_spi_parse_dt()
2448 of_spi_parse_dt_cs_delay(nc, &spi->cs_setup, "spi-cs-setup-delay-ns"); in of_spi_parse_dt()
2449 of_spi_parse_dt_cs_delay(nc, &spi->cs_hold, "spi-cs-hold-delay-ns"); in of_spi_parse_dt()
2450 of_spi_parse_dt_cs_delay(nc, &spi->cs_inactive, "spi-cs-inactive-delay-ns"); in of_spi_parse_dt()
2464 dev_err(&ctlr->dev, "spi_device alloc error for %pOF\n", nc); in of_register_spi_device()
2465 rc = -ENOMEM; in of_register_spi_device()
2470 rc = of_alias_from_compatible(nc, spi->modalias, in of_register_spi_device()
2471 sizeof(spi->modalias)); in of_register_spi_device()
2473 dev_err(&ctlr->dev, "cannot find modalias for %pOF\n", nc); in of_register_spi_device()
2484 device_set_node(&spi->dev, of_fwnode_handle(nc)); in of_register_spi_device()
2489 dev_err(&ctlr->dev, "spi_device register error %pOF\n", nc); in of_register_spi_device()
2503 * of_register_spi_devices() - Register child devices onto the SPI bus
2514 for_each_available_child_of_node(ctlr->dev.of_node, nc) { in of_register_spi_devices()
2519 dev_warn(&ctlr->dev, in of_register_spi_devices()
2530 * spi_new_ancillary_device() - Register ancillary SPI device
2534 * Register an ancillary SPI device; for example some chips have a chip-select
2544 struct spi_controller *ctlr = spi->controller; in spi_new_ancillary_device()
2552 rc = -ENOMEM; in spi_new_ancillary_device()
2556 strscpy(ancillary->modalias, "dummy", sizeof(ancillary->modalias)); in spi_new_ancillary_device()
2560 * logical CS in the spi->chip_select[]. If all the physical CS in spi_new_ancillary_device()
2570 /* Use provided chip-select for ancillary device */ in spi_new_ancillary_device()
2574 ancillary->max_speed_hz = spi->max_speed_hz; in spi_new_ancillary_device()
2575 ancillary->mode = spi->mode; in spi_new_ancillary_device()
2577 * spi->chip_select[i] gives the corresponding physical CS for logical CS i in spi_new_ancillary_device()
2578 * logical CS number is represented by setting the ith bit in spi->cs_index_mask in spi_new_ancillary_device()
2579 * So, for example, if spi->cs_index_mask = 0x01 then logical CS number is 0 and in spi_new_ancillary_device()
2580 * spi->chip_select[0] will give the physical CS. in spi_new_ancillary_device()
2581 * By default spi->chip_select[0] will hold the physical CS number so, set in spi_new_ancillary_device()
2582 * spi->cs_index_mask as 0x01. in spi_new_ancillary_device()
2584 ancillary->cs_index_mask = 0x01; in spi_new_ancillary_device()
2586 WARN_ON(!mutex_is_locked(&ctlr->add_lock)); in spi_new_ancillary_device()
2591 dev_err(&spi->dev, "failed to register ancillary device\n"); in spi_new_ancillary_device()
2620 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) in acpi_spi_count()
2623 sb = &ares->data.spi_serial_bus; in acpi_spi_count()
2624 if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_SPI) in acpi_spi_count()
2633 * acpi_spi_count_resources - Count the number of SpiSerialBus resources
2636 * Return: the number of SpiSerialBus resources in the ACPI-device's
2637 * resource-list; or a negative error code.
2664 && obj->buffer.length >= 4) in acpi_spi_parse_apple_properties()
2665 lookup->max_speed_hz = NSEC_PER_SEC / *(u32 *)obj->buffer.pointer; in acpi_spi_parse_apple_properties()
2668 && obj->buffer.length == 8) in acpi_spi_parse_apple_properties()
2669 lookup->bits_per_word = *(u64 *)obj->buffer.pointer; in acpi_spi_parse_apple_properties()
2672 && obj->buffer.length == 8 && !*(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2673 lookup->mode |= SPI_LSB_FIRST; in acpi_spi_parse_apple_properties()
2676 && obj->buffer.length == 8 && *(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2677 lookup->mode |= SPI_CPOL; in acpi_spi_parse_apple_properties()
2680 && obj->buffer.length == 8 && *(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2681 lookup->mode |= SPI_CPHA; in acpi_spi_parse_apple_properties()
2687 struct spi_controller *ctlr = lookup->ctlr; in acpi_spi_add_resource()
2689 if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { in acpi_spi_add_resource()
2694 sb = &ares->data.spi_serial_bus; in acpi_spi_add_resource()
2695 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_SPI) { in acpi_spi_add_resource()
2697 if (lookup->index != -1 && lookup->n++ != lookup->index) in acpi_spi_add_resource()
2701 sb->resource_source.string_ptr, in acpi_spi_add_resource()
2705 return -ENODEV; in acpi_spi_add_resource()
2708 if (ACPI_HANDLE(ctlr->dev.parent) != parent_handle) in acpi_spi_add_resource()
2709 return -ENODEV; in acpi_spi_add_resource()
2715 return -ENODEV; in acpi_spi_add_resource()
2719 return -EPROBE_DEFER; in acpi_spi_add_resource()
2721 lookup->ctlr = ctlr; in acpi_spi_add_resource()
2728 * 0 .. max - 1 so we need to ask the driver to in acpi_spi_add_resource()
2731 if (ctlr->fw_translate_cs) { in acpi_spi_add_resource()
2732 int cs = ctlr->fw_translate_cs(ctlr, in acpi_spi_add_resource()
2733 sb->device_selection); in acpi_spi_add_resource()
2736 lookup->chip_select = cs; in acpi_spi_add_resource()
2738 lookup->chip_select = sb->device_selection; in acpi_spi_add_resource()
2741 lookup->max_speed_hz = sb->connection_speed; in acpi_spi_add_resource()
2742 lookup->bits_per_word = sb->data_bit_length; in acpi_spi_add_resource()
2744 if (sb->clock_phase == ACPI_SPI_SECOND_PHASE) in acpi_spi_add_resource()
2745 lookup->mode |= SPI_CPHA; in acpi_spi_add_resource()
2746 if (sb->clock_polarity == ACPI_SPI_START_HIGH) in acpi_spi_add_resource()
2747 lookup->mode |= SPI_CPOL; in acpi_spi_add_resource()
2748 if (sb->device_polarity == ACPI_SPI_ACTIVE_HIGH) in acpi_spi_add_resource()
2749 lookup->mode |= SPI_CS_HIGH; in acpi_spi_add_resource()
2751 } else if (lookup->irq < 0) { in acpi_spi_add_resource()
2755 lookup->irq = r.start; in acpi_spi_add_resource()
2763 * acpi_spi_device_alloc - Allocate a spi device, and fill it in with ACPI information
2773 * If index is set to -1, index is not used.
2774 * Note: If index is -1, ctlr must be set.
2789 if (!ctlr && index == -1) in acpi_spi_device_alloc()
2790 return ERR_PTR(-EINVAL); in acpi_spi_device_alloc()
2793 lookup.irq = -1; in acpi_spi_device_alloc()
2807 ACPI_SUCCESS(acpi_get_parent(adev->handle, &parent_handle)) && in acpi_spi_device_alloc()
2808 ACPI_HANDLE(lookup.ctlr->dev.parent) == parent_handle) { in acpi_spi_device_alloc()
2814 return ERR_PTR(-ENODEV); in acpi_spi_device_alloc()
2818 dev_err(&lookup.ctlr->dev, "failed to allocate SPI device for %s\n", in acpi_spi_device_alloc()
2819 dev_name(&adev->dev)); in acpi_spi_device_alloc()
2820 return ERR_PTR(-ENOMEM); in acpi_spi_device_alloc()
2825 * logical CS in the spi->chip_select[]. If all the physical CS 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()
2842 * spi->chip_select[i] gives the corresponding physical CS for logical CS i in acpi_spi_device_alloc()
2843 * logical CS number is represented by setting the ith bit in spi->cs_index_mask in acpi_spi_device_alloc()
2844 * So, for example, if spi->cs_index_mask = 0x01 then logical CS number is 0 and in acpi_spi_device_alloc()
2845 * spi->chip_select[0] will give the physical CS. in acpi_spi_device_alloc()
2846 * By default spi->chip_select[0] will hold the physical CS number so, set in acpi_spi_device_alloc()
2847 * spi->cs_index_mask as 0x01. in acpi_spi_device_alloc()
2849 spi->cs_index_mask = 0x01; in acpi_spi_device_alloc()
2860 if (acpi_bus_get_status(adev) || !adev->status.present || in acpi_register_spi_device()
2864 spi = acpi_spi_device_alloc(ctlr, adev, -1); in acpi_register_spi_device()
2866 if (PTR_ERR(spi) == -ENOMEM) in acpi_register_spi_device()
2872 acpi_set_modalias(adev, acpi_device_hid(adev), spi->modalias, in acpi_register_spi_device()
2873 sizeof(spi->modalias)); in acpi_register_spi_device()
2875 if (spi->irq < 0) in acpi_register_spi_device()
2876 spi->irq = acpi_dev_gpio_irq_get(adev, 0); in acpi_register_spi_device()
2880 adev->power.flags.ignore_parent = true; in acpi_register_spi_device()
2882 adev->power.flags.ignore_parent = false; in acpi_register_spi_device()
2883 dev_err(&ctlr->dev, "failed to add SPI device %s from ACPI\n", in acpi_register_spi_device()
2884 dev_name(&adev->dev)); in acpi_register_spi_device()
2910 handle = ACPI_HANDLE(ctlr->dev.parent); in acpi_register_spi_devices()
2918 dev_warn(&ctlr->dev, "failed to enumerate SPI slaves\n"); in acpi_register_spi_devices()
2940 * spi_slave_abort - abort the ongoing transfer request on an SPI slave
2946 struct spi_controller *ctlr = spi->controller; in spi_slave_abort()
2948 if (spi_controller_is_slave(ctlr) && ctlr->slave_abort) in spi_slave_abort()
2949 return ctlr->slave_abort(ctlr); in spi_slave_abort()
2951 return -ENOTSUPP; in spi_slave_abort()
2957 struct spi_controller *ctlr = spi->controller; in spi_target_abort()
2959 if (spi_controller_is_target(ctlr) && ctlr->target_abort) in spi_target_abort()
2960 return ctlr->target_abort(ctlr); in spi_target_abort()
2962 return -ENOTSUPP; in spi_target_abort()
2973 child = device_find_any_child(&ctlr->dev); in slave_show()
2974 return sysfs_emit(buf, "%s\n", child ? to_spi_device(child)->modalias : NULL); in slave_show()
2989 return -EINVAL; in slave_store()
2991 child = device_find_any_child(&ctlr->dev); in slave_store()
3002 return -ENOMEM; in slave_store()
3004 strscpy(spi->modalias, name, sizeof(spi->modalias)); in slave_store()
3043 * __spi_alloc_controller - allocate an SPI master or slave controller
3045 * @size: how much zeroed driver-private data to allocate; the pointer to this
3080 device_initialize(&ctlr->dev); in __spi_alloc_controller()
3081 INIT_LIST_HEAD(&ctlr->queue); in __spi_alloc_controller()
3082 spin_lock_init(&ctlr->queue_lock); in __spi_alloc_controller()
3083 spin_lock_init(&ctlr->bus_lock_spinlock); in __spi_alloc_controller()
3084 mutex_init(&ctlr->bus_lock_mutex); in __spi_alloc_controller()
3085 mutex_init(&ctlr->io_mutex); in __spi_alloc_controller()
3086 mutex_init(&ctlr->add_lock); in __spi_alloc_controller()
3087 ctlr->bus_num = -1; in __spi_alloc_controller()
3088 ctlr->num_chipselect = 1; in __spi_alloc_controller()
3089 ctlr->slave = slave; in __spi_alloc_controller()
3091 ctlr->dev.class = &spi_slave_class; in __spi_alloc_controller()
3093 ctlr->dev.class = &spi_master_class; in __spi_alloc_controller()
3094 ctlr->dev.parent = dev; in __spi_alloc_controller()
3095 pm_suspend_ignore_children(&ctlr->dev, true); in __spi_alloc_controller()
3108 * __devm_spi_alloc_controller - resource-managed __spi_alloc_controller()
3110 * @size: how much zeroed driver-private data to allocate
3135 ctlr->devm_allocated = true; in __devm_spi_alloc_controller()
3147 * spi_get_gpio_descs() - grab chip select GPIOs for the master
3148 * @ctlr: The SPI master to grab GPIO descriptors for
3154 struct device *dev = &ctlr->dev; in spi_get_gpio_descs()
3161 if (nb == -ENOENT) in spi_get_gpio_descs()
3166 ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect); in spi_get_gpio_descs()
3168 cs = devm_kcalloc(dev, ctlr->num_chipselect, sizeof(*cs), in spi_get_gpio_descs()
3171 return -ENOMEM; in spi_get_gpio_descs()
3172 ctlr->cs_gpiods = cs; in spi_get_gpio_descs()
3189 * If we find a CS GPIO, name it after the device and in spi_get_gpio_descs()
3197 return -ENOMEM; in spi_get_gpio_descs()
3203 if (ctlr->max_native_cs && i >= ctlr->max_native_cs) { in spi_get_gpio_descs()
3205 return -EINVAL; in spi_get_gpio_descs()
3210 ctlr->unused_native_cs = ffs(~native_cs_mask) - 1; in spi_get_gpio_descs()
3212 if ((ctlr->flags & SPI_CONTROLLER_GPIO_SS) && num_cs_gpios && in spi_get_gpio_descs()
3213 ctlr->max_native_cs && ctlr->unused_native_cs >= ctlr->max_native_cs) { in spi_get_gpio_descs()
3215 return -EINVAL; in spi_get_gpio_descs()
3224 * The controller may implement only the high-level SPI-memory like in spi_controller_check_ops()
3227 * If ->mem_ops or ->mem_ops->exec_op is NULL, we request that at least in spi_controller_check_ops()
3228 * one of the ->transfer_xxx() method be implemented. in spi_controller_check_ops()
3230 if (!ctlr->mem_ops || !ctlr->mem_ops->exec_op) { in spi_controller_check_ops()
3231 if (!ctlr->transfer && !ctlr->transfer_one && in spi_controller_check_ops()
3232 !ctlr->transfer_one_message) { in spi_controller_check_ops()
3233 return -EINVAL; in spi_controller_check_ops()
3249 return id == -ENOSPC ? -EBUSY : id; in spi_controller_id_alloc()
3250 ctlr->bus_num = id; in spi_controller_id_alloc()
3255 * spi_register_controller - register SPI master or slave controller
3260 * SPI controllers connect to their drivers using some non-SPI bus,
3265 * and board-specific addressing for SPI devices combines those numbers
3279 struct device *dev = ctlr->dev.parent; in spi_register_controller()
3286 return -ENODEV; in spi_register_controller()
3296 if (ctlr->bus_num < 0) in spi_register_controller()
3297 ctlr->bus_num = of_alias_get_id(ctlr->dev.of_node, "spi"); in spi_register_controller()
3298 if (ctlr->bus_num >= 0) { in spi_register_controller()
3299 /* Devices with a fixed bus num must check-in with the num */ in spi_register_controller()
3300 status = spi_controller_id_alloc(ctlr, ctlr->bus_num, ctlr->bus_num + 1); in spi_register_controller()
3304 if (ctlr->bus_num < 0) { in spi_register_controller()
3315 ctlr->bus_lock_flag = 0; in spi_register_controller()
3316 init_completion(&ctlr->xfer_completion); in spi_register_controller()
3317 init_completion(&ctlr->cur_msg_completion); in spi_register_controller()
3318 if (!ctlr->max_dma_len) in spi_register_controller()
3319 ctlr->max_dma_len = INT_MAX; in spi_register_controller()
3325 dev_set_name(&ctlr->dev, "spi%u", ctlr->bus_num); in spi_register_controller()
3327 if (!spi_controller_is_slave(ctlr) && ctlr->use_gpio_descriptors) { in spi_register_controller()
3332 * A controller using GPIO descriptors always in spi_register_controller()
3335 ctlr->mode_bits |= SPI_CS_HIGH; in spi_register_controller()
3339 * Even if it's just one always-selected device, there must in spi_register_controller()
3342 if (!ctlr->num_chipselect) { in spi_register_controller()
3343 status = -EINVAL; in spi_register_controller()
3347 /* Setting last_cs to -1 means no chip selected */ in spi_register_controller()
3349 ctlr->last_cs[idx] = -1; in spi_register_controller()
3351 status = device_add(&ctlr->dev); in spi_register_controller()
3356 dev_name(&ctlr->dev)); in spi_register_controller()
3360 * need the queueing logic if the driver is only supporting high-level in spi_register_controller()
3363 if (ctlr->transfer) { in spi_register_controller()
3365 } else if (ctlr->transfer_one || ctlr->transfer_one_message) { in spi_register_controller()
3368 device_del(&ctlr->dev); in spi_register_controller()
3373 ctlr->pcpu_statistics = spi_alloc_pcpu_stats(dev); in spi_register_controller()
3374 if (!ctlr->pcpu_statistics) { in spi_register_controller()
3375 dev_err(dev, "Error allocating per-cpu statistics\n"); in spi_register_controller()
3376 status = -ENOMEM; in spi_register_controller()
3381 list_add_tail(&ctlr->list, &spi_controller_list); in spi_register_controller()
3383 spi_match_controller_to_boardinfo(ctlr, &bi->board_info); in spi_register_controller()
3395 idr_remove(&spi_master_idr, ctlr->bus_num); in spi_register_controller()
3407 * devm_spi_register_controller - register managed SPI master or slave
3427 return -ENOMEM; in devm_spi_register_controller()
3448 * spi_unregister_controller - unregister SPI master or slave controller
3462 int id = ctlr->bus_num; in spi_unregister_controller()
3466 mutex_lock(&ctlr->add_lock); in spi_unregister_controller()
3468 device_for_each_child(&ctlr->dev, NULL, __unregister); in spi_unregister_controller()
3474 if (ctlr->queued) { in spi_unregister_controller()
3476 dev_err(&ctlr->dev, "queue remove failed\n"); in spi_unregister_controller()
3479 list_del(&ctlr->list); in spi_unregister_controller()
3482 device_del(&ctlr->dev); in spi_unregister_controller()
3491 mutex_unlock(&ctlr->add_lock); in spi_unregister_controller()
3497 if (!ctlr->devm_allocated) in spi_unregister_controller()
3498 put_device(&ctlr->dev); in spi_unregister_controller()
3504 return ctlr->flags & SPI_CONTROLLER_SUSPENDED ? -ESHUTDOWN : 0; in __spi_check_suspended()
3509 mutex_lock(&ctlr->bus_lock_mutex); in __spi_mark_suspended()
3510 ctlr->flags |= SPI_CONTROLLER_SUSPENDED; in __spi_mark_suspended()
3511 mutex_unlock(&ctlr->bus_lock_mutex); in __spi_mark_suspended()
3516 mutex_lock(&ctlr->bus_lock_mutex); in __spi_mark_resumed()
3517 ctlr->flags &= ~SPI_CONTROLLER_SUSPENDED; in __spi_mark_resumed()
3518 mutex_unlock(&ctlr->bus_lock_mutex); in __spi_mark_resumed()
3525 /* Basically no-ops for non-queued controllers */ in spi_controller_suspend()
3526 if (ctlr->queued) { in spi_controller_suspend()
3529 dev_err(&ctlr->dev, "queue stop failed\n"); in spi_controller_suspend()
3543 if (ctlr->queued) { in spi_controller_resume()
3546 dev_err(&ctlr->dev, "queue restart failed\n"); in spi_controller_resume()
3552 /*-------------------------------------------------------------------------*/
3564 if (rxfer->release) in __spi_replace_transfers_release()
3565 rxfer->release(ctlr, msg, res); in __spi_replace_transfers_release()
3568 list_splice(&rxfer->replaced_transfers, rxfer->replaced_after); in __spi_replace_transfers_release()
3571 for (i = 0; i < rxfer->inserted; i++) in __spi_replace_transfers_release()
3572 list_del(&rxfer->inserted_transfers[i].transfer_list); in __spi_replace_transfers_release()
3576 * spi_replace_transfers - replace transfers with several transfers
3604 rxfer = spi_res_alloc(msg->spi, __spi_replace_transfers_release, in spi_replace_transfers()
3609 return ERR_PTR(-ENOMEM); in spi_replace_transfers()
3612 rxfer->release = release; in spi_replace_transfers()
3616 rxfer->extradata = in spi_replace_transfers()
3617 &rxfer->inserted_transfers[insert]; in spi_replace_transfers()
3620 INIT_LIST_HEAD(&rxfer->replaced_transfers); in spi_replace_transfers()
3624 * the @replaced_transfers - it may be spi_message.messages! in spi_replace_transfers()
3626 rxfer->replaced_after = xfer_first->transfer_list.prev; in spi_replace_transfers()
3631 * If the entry after replaced_after it is msg->transfers in spi_replace_transfers()
3635 if (rxfer->replaced_after->next == &msg->transfers) { in spi_replace_transfers()
3636 dev_err(&msg->spi->dev, in spi_replace_transfers()
3639 list_splice(&rxfer->replaced_transfers, in spi_replace_transfers()
3640 rxfer->replaced_after); in spi_replace_transfers()
3646 return ERR_PTR(-EINVAL); in spi_replace_transfers()
3653 list_move_tail(rxfer->replaced_after->next, in spi_replace_transfers()
3654 &rxfer->replaced_transfers); in spi_replace_transfers()
3663 xfer = &rxfer->inserted_transfers[insert - 1 - i]; in spi_replace_transfers()
3669 list_add(&xfer->transfer_list, rxfer->replaced_after); in spi_replace_transfers()
3673 xfer->cs_change = false; in spi_replace_transfers()
3674 xfer->delay.value = 0; in spi_replace_transfers()
3679 rxfer->inserted = insert; in spi_replace_transfers()
3699 count = DIV_ROUND_UP(xfer->len, maxsize); in __spi_split_transfer_maxsize()
3705 xfers = srt->inserted_transfers; in __spi_split_transfer_maxsize()
3737 xfers[i].len = min(maxsize, xfers[i].len - offset); in __spi_split_transfer_maxsize()
3744 *xferp = &xfers[count - 1]; in __spi_split_transfer_maxsize()
3747 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, in __spi_split_transfer_maxsize()
3749 SPI_STATISTICS_INCREMENT_FIELD(msg->spi->pcpu_statistics, in __spi_split_transfer_maxsize()
3756 * spi_split_transfers_maxsize - split spi transfers into multiple transfers
3781 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_split_transfers_maxsize()
3782 if (xfer->len > maxsize) { in spi_split_transfers_maxsize()
3796 * spi_split_transfers_maxwords - split SPI transfers into multiple transfers
3820 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_split_transfers_maxwords()
3824 maxsize = maxwords * roundup_pow_of_two(BITS_TO_BYTES(xfer->bits_per_word)); in spi_split_transfers_maxwords()
3825 if (xfer->len > maxsize) { in spi_split_transfers_maxwords()
3837 /*-------------------------------------------------------------------------*/
3847 if (ctlr->bits_per_word_mask) { in __spi_validate_bits_per_word()
3850 return -EINVAL; in __spi_validate_bits_per_word()
3851 if (!(ctlr->bits_per_word_mask & SPI_BPW_MASK(bits_per_word))) in __spi_validate_bits_per_word()
3852 return -EINVAL; in __spi_validate_bits_per_word()
3859 * spi_set_cs_timing - configure CS setup, hold, and inactive delays
3866 struct device *parent = spi->controller->dev.parent; in spi_set_cs_timing()
3869 if (spi->controller->set_cs_timing && !spi_get_csgpiod(spi, 0)) { in spi_set_cs_timing()
3870 if (spi->controller->auto_runtime_pm) { in spi_set_cs_timing()
3874 dev_err(&spi->controller->dev, "Failed to power device: %d\n", in spi_set_cs_timing()
3879 status = spi->controller->set_cs_timing(spi); in spi_set_cs_timing()
3883 status = spi->controller->set_cs_timing(spi); in spi_set_cs_timing()
3890 * spi_setup - setup SPI mode and clock rate
3905 * LSB-first wire encoding, or active-high chipselects.
3918 if ((hweight_long(spi->mode & in spi_setup()
3920 (hweight_long(spi->mode & in spi_setup()
3922 dev_err(&spi->dev, in spi_setup()
3923 "setup: can not select any two of dual, quad and no-rx/tx at the same time\n"); in spi_setup()
3924 return -EINVAL; in spi_setup()
3927 if ((spi->mode & SPI_3WIRE) && (spi->mode & in spi_setup()
3930 return -EINVAL; in spi_setup()
3937 bad_bits = spi->mode & ~(spi->controller->mode_bits | SPI_CS_WORD | in spi_setup()
3943 dev_warn(&spi->dev, in spi_setup()
3946 spi->mode &= ~ugly_bits; in spi_setup()
3950 dev_err(&spi->dev, "setup: unsupported mode bits %x\n", in spi_setup()
3952 return -EINVAL; in spi_setup()
3955 if (!spi->bits_per_word) { in spi_setup()
3956 spi->bits_per_word = 8; in spi_setup()
3959 * Some controllers may not support the default 8 bits-per-word in spi_setup()
3962 status = __spi_validate_bits_per_word(spi->controller, in spi_setup()
3963 spi->bits_per_word); in spi_setup()
3968 if (spi->controller->max_speed_hz && in spi_setup()
3969 (!spi->max_speed_hz || in spi_setup()
3970 spi->max_speed_hz > spi->controller->max_speed_hz)) in spi_setup()
3971 spi->max_speed_hz = spi->controller->max_speed_hz; in spi_setup()
3973 mutex_lock(&spi->controller->io_mutex); in spi_setup()
3975 if (spi->controller->setup) { in spi_setup()
3976 status = spi->controller->setup(spi); in spi_setup()
3978 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3979 dev_err(&spi->controller->dev, "Failed to setup device: %d\n", in spi_setup()
3987 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3991 if (spi->controller->auto_runtime_pm && spi->controller->set_cs) { in spi_setup()
3992 status = pm_runtime_resume_and_get(spi->controller->dev.parent); in spi_setup()
3994 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3995 dev_err(&spi->controller->dev, "Failed to power device: %d\n", in spi_setup()
4003 * checking for a non-zero return value instead of a negative in spi_setup()
4009 pm_runtime_mark_last_busy(spi->controller->dev.parent); in spi_setup()
4010 pm_runtime_put_autosuspend(spi->controller->dev.parent); in spi_setup()
4015 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
4017 if (spi->rt && !spi->controller->rt) { in spi_setup()
4018 spi->controller->rt = true; in spi_setup()
4019 spi_set_thread_rt(spi->controller); in spi_setup()
4024 dev_dbg(&spi->dev, "setup mode %lu, %s%s%s%s%u bits/w, %u Hz max --> %d\n", in spi_setup()
4025 spi->mode & SPI_MODE_X_MASK, in spi_setup()
4026 (spi->mode & SPI_CS_HIGH) ? "cs_high, " : "", in spi_setup()
4027 (spi->mode & SPI_LSB_FIRST) ? "lsb, " : "", in spi_setup()
4028 (spi->mode & SPI_3WIRE) ? "3wire, " : "", in spi_setup()
4029 (spi->mode & SPI_LOOP) ? "loopback, " : "", in spi_setup()
4030 spi->bits_per_word, spi->max_speed_hz, in spi_setup()
4042 delay1 = spi_delay_to_ns(&xfer->word_delay, xfer); in _spi_xfer_word_delay_update()
4046 delay2 = spi_delay_to_ns(&spi->word_delay, xfer); in _spi_xfer_word_delay_update()
4051 memcpy(&xfer->word_delay, &spi->word_delay, in _spi_xfer_word_delay_update()
4052 sizeof(xfer->word_delay)); in _spi_xfer_word_delay_update()
4059 struct spi_controller *ctlr = spi->controller; in __spi_validate()
4063 if (list_empty(&message->transfers)) in __spi_validate()
4064 return -EINVAL; in __spi_validate()
4068 * transfer (indicated by the SPI_CS_WORD flag) or we are using a GPIO in __spi_validate()
4069 * for the CS line, we can emulate the CS-per-word hardware function by in __spi_validate()
4070 * splitting transfers into one-word transfers and ensuring that in __spi_validate()
4073 if ((spi->mode & SPI_CS_WORD) && (!(ctlr->mode_bits & SPI_CS_WORD) || in __spi_validate()
4075 size_t maxsize = BITS_TO_BYTES(spi->bits_per_word); in __spi_validate()
4078 /* spi_split_transfers_maxsize() requires message->spi */ in __spi_validate()
4079 message->spi = spi; in __spi_validate()
4086 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_validate()
4088 if (list_is_last(&xfer->transfer_list, &message->transfers)) in __spi_validate()
4090 xfer->cs_change = 1; in __spi_validate()
4095 * Half-duplex links include original MicroWire, and ones with in __spi_validate()
4096 * only one data pin like SPI_3WIRE (switches direction) or where in __spi_validate()
4100 if ((ctlr->flags & SPI_CONTROLLER_HALF_DUPLEX) || in __spi_validate()
4101 (spi->mode & SPI_3WIRE)) { in __spi_validate()
4102 unsigned flags = ctlr->flags; in __spi_validate()
4104 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_validate()
4105 if (xfer->rx_buf && xfer->tx_buf) in __spi_validate()
4106 return -EINVAL; in __spi_validate()
4107 if ((flags & SPI_CONTROLLER_NO_TX) && xfer->tx_buf) in __spi_validate()
4108 return -EINVAL; in __spi_validate()
4109 if ((flags & SPI_CONTROLLER_NO_RX) && xfer->rx_buf) in __spi_validate()
4110 return -EINVAL; in __spi_validate()
4122 message->frame_length = 0; in __spi_validate()
4123 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_validate()
4124 xfer->effective_speed_hz = 0; in __spi_validate()
4125 message->frame_length += xfer->len; in __spi_validate()
4126 if (!xfer->bits_per_word) in __spi_validate()
4127 xfer->bits_per_word = spi->bits_per_word; in __spi_validate()
4129 if (!xfer->speed_hz) in __spi_validate()
4130 xfer->speed_hz = spi->max_speed_hz; in __spi_validate()
4132 if (ctlr->max_speed_hz && xfer->speed_hz > ctlr->max_speed_hz) in __spi_validate()
4133 xfer->speed_hz = ctlr->max_speed_hz; in __spi_validate()
4135 if (__spi_validate_bits_per_word(ctlr, xfer->bits_per_word)) in __spi_validate()
4136 return -EINVAL; in __spi_validate()
4140 * where SPI word size should be power-of-two multiple. in __spi_validate()
4142 if (xfer->bits_per_word <= 8) in __spi_validate()
4144 else if (xfer->bits_per_word <= 16) in __spi_validate()
4150 if (xfer->len % w_size) in __spi_validate()
4151 return -EINVAL; in __spi_validate()
4153 if (xfer->speed_hz && ctlr->min_speed_hz && in __spi_validate()
4154 xfer->speed_hz < ctlr->min_speed_hz) in __spi_validate()
4155 return -EINVAL; in __spi_validate()
4157 if (xfer->tx_buf && !xfer->tx_nbits) in __spi_validate()
4158 xfer->tx_nbits = SPI_NBITS_SINGLE; in __spi_validate()
4159 if (xfer->rx_buf && !xfer->rx_nbits) in __spi_validate()
4160 xfer->rx_nbits = SPI_NBITS_SINGLE; in __spi_validate()
4166 if (xfer->tx_buf) { in __spi_validate()
4167 if (spi->mode & SPI_NO_TX) in __spi_validate()
4168 return -EINVAL; in __spi_validate()
4169 if (xfer->tx_nbits != SPI_NBITS_SINGLE && in __spi_validate()
4170 xfer->tx_nbits != SPI_NBITS_DUAL && in __spi_validate()
4171 xfer->tx_nbits != SPI_NBITS_QUAD) in __spi_validate()
4172 return -EINVAL; in __spi_validate()
4173 if ((xfer->tx_nbits == SPI_NBITS_DUAL) && in __spi_validate()
4174 !(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD))) in __spi_validate()
4175 return -EINVAL; in __spi_validate()
4176 if ((xfer->tx_nbits == SPI_NBITS_QUAD) && in __spi_validate()
4177 !(spi->mode & SPI_TX_QUAD)) in __spi_validate()
4178 return -EINVAL; in __spi_validate()
4181 if (xfer->rx_buf) { in __spi_validate()
4182 if (spi->mode & SPI_NO_RX) in __spi_validate()
4183 return -EINVAL; in __spi_validate()
4184 if (xfer->rx_nbits != SPI_NBITS_SINGLE && in __spi_validate()
4185 xfer->rx_nbits != SPI_NBITS_DUAL && in __spi_validate()
4186 xfer->rx_nbits != SPI_NBITS_QUAD) in __spi_validate()
4187 return -EINVAL; in __spi_validate()
4188 if ((xfer->rx_nbits == SPI_NBITS_DUAL) && in __spi_validate()
4189 !(spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD))) in __spi_validate()
4190 return -EINVAL; in __spi_validate()
4191 if ((xfer->rx_nbits == SPI_NBITS_QUAD) && in __spi_validate()
4192 !(spi->mode & SPI_RX_QUAD)) in __spi_validate()
4193 return -EINVAL; in __spi_validate()
4197 return -EINVAL; in __spi_validate()
4200 message->status = -EINPROGRESS; in __spi_validate()
4207 struct spi_controller *ctlr = spi->controller; in __spi_async()
4214 if (!ctlr->transfer) in __spi_async()
4215 return -ENOTSUPP; in __spi_async()
4217 message->spi = spi; in __spi_async()
4219 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_async); in __spi_async()
4220 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_async); in __spi_async()
4224 if (!ctlr->ptp_sts_supported) { in __spi_async()
4225 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_async()
4226 xfer->ptp_sts_word_pre = 0; in __spi_async()
4227 ptp_read_system_prets(xfer->ptp_sts); in __spi_async()
4231 return ctlr->transfer(spi, message); in __spi_async()
4235 * spi_async - asynchronous SPI transfer
4244 * Before that invocation, the value of message->status is undefined.
4245 * When the callback is issued, message->status holds either zero (to
4267 struct spi_controller *ctlr = spi->controller; in spi_async()
4275 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in spi_async()
4277 if (ctlr->bus_lock_flag) in spi_async()
4278 ret = -EBUSY; in spi_async()
4282 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in spi_async()
4289 * spi_async_locked - version of spi_async with exclusive bus usage
4298 * Before that invocation, the value of message->status is undefined.
4299 * When the callback is issued, message->status holds either zero (to
4321 struct spi_controller *ctlr = spi->controller; in spi_async_locked()
4329 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in spi_async_locked()
4333 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in spi_async_locked()
4344 mutex_lock(&ctlr->io_mutex); in __spi_transfer_message_noqueue()
4346 was_busy = ctlr->busy; in __spi_transfer_message_noqueue()
4348 ctlr->cur_msg = msg; in __spi_transfer_message_noqueue()
4351 dev_err(&ctlr->dev, "noqueue transfer failed\n"); in __spi_transfer_message_noqueue()
4352 ctlr->cur_msg = NULL; in __spi_transfer_message_noqueue()
4353 ctlr->fallback = false; in __spi_transfer_message_noqueue()
4356 kfree(ctlr->dummy_rx); in __spi_transfer_message_noqueue()
4357 ctlr->dummy_rx = NULL; in __spi_transfer_message_noqueue()
4358 kfree(ctlr->dummy_tx); in __spi_transfer_message_noqueue()
4359 ctlr->dummy_tx = NULL; in __spi_transfer_message_noqueue()
4360 if (ctlr->unprepare_transfer_hardware && in __spi_transfer_message_noqueue()
4361 ctlr->unprepare_transfer_hardware(ctlr)) in __spi_transfer_message_noqueue()
4362 dev_err(&ctlr->dev, in __spi_transfer_message_noqueue()
4367 mutex_unlock(&ctlr->io_mutex); in __spi_transfer_message_noqueue()
4370 /*-------------------------------------------------------------------------*/
4387 struct spi_controller *ctlr = spi->controller; in __spi_sync()
4390 dev_warn_once(&spi->dev, "Attempted to sync while suspend\n"); in __spi_sync()
4391 return -ESHUTDOWN; in __spi_sync()
4398 message->spi = spi; in __spi_sync()
4400 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_sync); in __spi_sync()
4401 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_sync); in __spi_sync()
4409 if (READ_ONCE(ctlr->queue_empty) && !ctlr->must_async) { in __spi_sync()
4410 message->actual_length = 0; in __spi_sync()
4411 message->status = -EINPROGRESS; in __spi_sync()
4415 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_sync_immediate); in __spi_sync()
4416 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_sync_immediate); in __spi_sync()
4420 return message->status; in __spi_sync()
4429 message->complete = spi_complete; in __spi_sync()
4430 message->context = &done; in __spi_sync()
4434 status = message->status; in __spi_sync()
4436 message->context = NULL; in __spi_sync()
4442 * spi_sync - blocking/synchronous SPI data transfers
4448 * is non-interruptible, and has no timeout. Low-overhead controller
4453 * frequently-used devices may want to minimize costs of selecting a chip,
4466 mutex_lock(&spi->controller->bus_lock_mutex); in spi_sync()
4468 mutex_unlock(&spi->controller->bus_lock_mutex); in spi_sync()
4475 * spi_sync_locked - version of spi_sync with exclusive bus usage
4481 * is non-interruptible, and has no timeout. Low-overhead controller
4497 * spi_bus_lock - obtain a lock for exclusive SPI bus usage
4502 * is non-interruptible, and has no timeout.
4515 mutex_lock(&ctlr->bus_lock_mutex); in spi_bus_lock()
4517 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in spi_bus_lock()
4518 ctlr->bus_lock_flag = 1; in spi_bus_lock()
4519 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in spi_bus_lock()
4528 * spi_bus_unlock - release the lock for exclusive SPI bus usage
4533 * is non-interruptible, and has no timeout.
4542 ctlr->bus_lock_flag = 0; in spi_bus_unlock()
4544 mutex_unlock(&ctlr->bus_lock_mutex); in spi_bus_unlock()
4556 * spi_write_then_read - SPI synchronous write followed by read
4558 * @txbuf: data to be written (need not be DMA-safe)
4560 * @rxbuf: buffer into which data will be read (need not be DMA-safe)
4570 * Performance-sensitive or bulk transfer code should instead use
4571 * spi_{async,sync}() calls with DMA-safe buffers.
4587 * Use preallocated DMA-safe buffer if we can. We can't avoid in spi_write_then_read()
4590 * using the pre-allocated buffer or the transfer is too large. in spi_write_then_read()
4596 return -ENOMEM; in spi_write_then_read()
4630 /*-------------------------------------------------------------------------*/
4665 ctlr = of_find_spi_controller_by_node(rd->dn->parent); in of_spi_notify()
4669 if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) { in of_spi_notify()
4670 put_device(&ctlr->dev); in of_spi_notify()
4678 rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE; in of_spi_notify()
4679 spi = of_register_spi_device(ctlr, rd->dn); in of_spi_notify()
4680 put_device(&ctlr->dev); in of_spi_notify()
4684 __func__, rd->dn); in of_spi_notify()
4685 of_node_clear_flag(rd->dn, OF_POPULATED); in of_spi_notify()
4692 if (!of_node_check_flag(rd->dn, OF_POPULATED)) in of_spi_notify()
4696 spi = of_find_spi_device_by_node(rd->dn); in of_spi_notify()
4704 put_device(&spi->dev); in of_spi_notify()
4721 return ACPI_COMPANION(dev->parent) == data; in spi_acpi_controller_match()
4762 put_device(&ctlr->dev); in acpi_spi_notify()
4773 put_device(&spi->dev); in acpi_spi_notify()
4793 status = -ENOMEM; in spi_init()