Lines Matching +full:bias +full:- +full:bus +full:- +full:hold
1 // SPDX-License-Identifier: GPL-2.0-or-later
9 #include <linux/clk/clk-conf.h>
13 #include <linux/dma-mapping.h>
36 #include <linux/spi/spi-mem.h>
52 spi_controller_put(spi->controller); in spidev_release()
53 kfree(spi->driver_override); in spidev_release()
54 free_percpu(spi->pcpu_statistics); in spidev_release()
64 len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1); in modalias_show()
65 if (len != -ENODEV) in modalias_show()
68 return sysfs_emit(buf, "%s%s\n", SPI_MODULE_PREFIX, spi->modalias); in modalias_show()
79 ret = driver_set_override(dev, &spi->driver_override, buf, count); in driver_override_store()
93 len = sysfs_emit(buf, "%s\n", spi->driver_override ? : ""); in driver_override_show()
115 u64_stats_init(&stat->syncp); in spi_alloc_pcpu_stats()
136 start = u64_stats_fetch_begin(&pcpu_stats->syncp); in spi_emit_pcpu_stats()
138 } while (u64_stats_fetch_retry(&pcpu_stats->syncp, start)); in spi_emit_pcpu_stats()
151 return spi_statistics_##field##_show(ctlr->pcpu_statistics, buf); \
162 return spi_statistics_##field##_show(spi->pcpu_statistics, buf); \
199 SPI_STATISTICS_TRANSFER_BYTES_HISTO(0, "0-1");
200 SPI_STATISTICS_TRANSFER_BYTES_HISTO(1, "2-3");
201 SPI_STATISTICS_TRANSFER_BYTES_HISTO(2, "4-7");
202 SPI_STATISTICS_TRANSFER_BYTES_HISTO(3, "8-15");
203 SPI_STATISTICS_TRANSFER_BYTES_HISTO(4, "16-31");
204 SPI_STATISTICS_TRANSFER_BYTES_HISTO(5, "32-63");
205 SPI_STATISTICS_TRANSFER_BYTES_HISTO(6, "64-127");
206 SPI_STATISTICS_TRANSFER_BYTES_HISTO(7, "128-255");
207 SPI_STATISTICS_TRANSFER_BYTES_HISTO(8, "256-511");
208 SPI_STATISTICS_TRANSFER_BYTES_HISTO(9, "512-1023");
209 SPI_STATISTICS_TRANSFER_BYTES_HISTO(10, "1024-2047");
210 SPI_STATISTICS_TRANSFER_BYTES_HISTO(11, "2048-4095");
211 SPI_STATISTICS_TRANSFER_BYTES_HISTO(12, "4096-8191");
212 SPI_STATISTICS_TRANSFER_BYTES_HISTO(13, "8192-16383");
213 SPI_STATISTICS_TRANSFER_BYTES_HISTO(14, "16384-32767");
214 SPI_STATISTICS_TRANSFER_BYTES_HISTO(15, "32768-65535");
318 int l2len = min(fls(xfer->len), SPI_STATISTICS_HISTO_SIZE) - 1; in spi_statistics_add_transfer_stats()
326 u64_stats_update_begin(&stats->syncp); in spi_statistics_add_transfer_stats()
328 u64_stats_inc(&stats->transfers); in spi_statistics_add_transfer_stats()
329 u64_stats_inc(&stats->transfer_bytes_histo[l2len]); in spi_statistics_add_transfer_stats()
331 u64_stats_add(&stats->bytes, xfer->len); in spi_statistics_add_transfer_stats()
333 u64_stats_add(&stats->bytes_tx, xfer->len); in spi_statistics_add_transfer_stats()
335 u64_stats_add(&stats->bytes_rx, xfer->len); in spi_statistics_add_transfer_stats()
337 u64_stats_update_end(&stats->syncp); in spi_statistics_add_transfer_stats()
342 * modalias support makes "modprobe $MODALIAS" new-style hotplug work,
347 while (id->name[0]) { in spi_match_id()
348 if (!strcmp(name, id->name)) in spi_match_id()
357 const struct spi_driver *sdrv = to_spi_driver(sdev->dev.driver); in spi_get_device_id()
359 return spi_match_id(sdrv->id_table, sdev->modalias); in spi_get_device_id()
367 match = device_get_match_data(&sdev->dev); in spi_get_device_match_data()
371 return (const void *)spi_get_device_id(sdev)->driver_data; in spi_get_device_match_data()
381 if (spi->driver_override) in spi_match_device()
382 return strcmp(spi->driver_override, drv->name) == 0; in spi_match_device()
392 if (sdrv->id_table) in spi_match_device()
393 return !!spi_match_id(sdrv->id_table, spi->modalias); in spi_match_device()
395 return strcmp(spi->modalias, drv->name) == 0; in spi_match_device()
404 if (rc != -ENODEV) in spi_uevent()
407 return add_uevent_var(env, "MODALIAS=%s%s", SPI_MODULE_PREFIX, spi->modalias); in spi_uevent()
412 const struct spi_driver *sdrv = to_spi_driver(dev->driver); in spi_probe()
417 ret = of_clk_set_defaults(dev->of_node, false); in spi_probe()
422 spi->irq = of_irq_get(dev->of_node, 0); in spi_probe()
423 else if (is_acpi_device_node(fwnode) && spi->irq < 0) in spi_probe()
424 spi->irq = acpi_dev_gpio_irq_get(to_acpi_device_node(fwnode), 0); in spi_probe()
425 if (spi->irq == -EPROBE_DEFER) in spi_probe()
426 return dev_err_probe(dev, spi->irq, "Failed to get irq\n"); in spi_probe()
427 if (spi->irq < 0) in spi_probe()
428 spi->irq = 0; in spi_probe()
435 if (sdrv->probe) in spi_probe()
436 ret = sdrv->probe(spi); in spi_probe()
443 const struct spi_driver *sdrv = to_spi_driver(dev->driver); in spi_remove()
445 if (sdrv->remove) in spi_remove()
446 sdrv->remove(to_spi_device(dev)); in spi_remove()
451 if (dev->driver) { in spi_shutdown()
452 const struct spi_driver *sdrv = to_spi_driver(dev->driver); in spi_shutdown()
454 if (sdrv->shutdown) in spi_shutdown()
455 sdrv->shutdown(to_spi_device(dev)); in spi_shutdown()
471 * __spi_register_driver - register a SPI driver
480 sdrv->driver.owner = owner; in __spi_register_driver()
481 sdrv->driver.bus = &spi_bus_type; in __spi_register_driver()
488 if (sdrv->driver.of_match_table) { in __spi_register_driver()
491 for (of_id = sdrv->driver.of_match_table; of_id->compatible[0]; in __spi_register_driver()
496 of_name = strnchr(of_id->compatible, in __spi_register_driver()
497 sizeof(of_id->compatible), ','); in __spi_register_driver()
501 of_name = of_id->compatible; in __spi_register_driver()
503 if (sdrv->id_table) { in __spi_register_driver()
506 spi_id = spi_match_id(sdrv->id_table, of_name); in __spi_register_driver()
510 if (strcmp(sdrv->driver.name, of_name) == 0) in __spi_register_driver()
515 sdrv->driver.name, of_id->compatible); in __spi_register_driver()
519 return driver_register(&sdrv->driver); in __spi_register_driver()
523 /*-------------------------------------------------------------------------*/
527 * would make them board-specific. Similarly with SPI controller drivers.
528 * Device registration normally goes into like arch/.../mach.../board-YYY.c
548 * spi_alloc_device - Allocate a new SPI device
577 spi->pcpu_statistics = spi_alloc_pcpu_stats(NULL); in spi_alloc_device()
578 if (!spi->pcpu_statistics) { in spi_alloc_device()
584 spi->controller = ctlr; in spi_alloc_device()
585 spi->dev.parent = &ctlr->dev; in spi_alloc_device()
586 spi->dev.bus = &spi_bus_type; in spi_alloc_device()
587 spi->dev.release = spidev_release; in spi_alloc_device()
588 spi->mode = ctlr->buswidth_override_bits; in spi_alloc_device()
589 spi->num_chipselect = 1; in spi_alloc_device()
591 device_initialize(&spi->dev); in spi_alloc_device()
598 struct device *dev = &spi->dev; in spi_dev_set_name()
602 dev_set_name(dev, "spi-%s", acpi_dev_name(to_acpi_device_node(fwnode))); in spi_dev_set_name()
607 dev_set_name(dev, "spi-%pfwP", fwnode); in spi_dev_set_name()
611 dev_set_name(&spi->dev, "%s.%u", dev_name(&spi->controller->dev), in spi_dev_set_name()
617 * logical CS in the spi->chip_select[]. If all the physical CS
620 * CS can be 0. As a solution to this issue initialize all the CS to -1.
621 * Now all the unused logical CS will have -1 physical CS value & can be
624 #define SPI_INVALID_CS ((s8)-1)
634 for (idx_new = new_idx; idx_new < new_spi->num_chipselect; idx_new++) { in spi_dev_check_cs()
638 return -EBUSY; in spi_dev_check_cs()
650 if (spi->controller == new_spi->controller) { in spi_dev_check()
651 for (idx = 0; idx < spi->num_chipselect; idx++) { in spi_dev_check()
662 if (spi->controller->cleanup) in spi_cleanup()
663 spi->controller->cleanup(spi); in spi_cleanup()
668 struct spi_controller *ctlr = spi->controller; in __spi_add_device()
669 struct device *dev = ctlr->dev.parent; in __spi_add_device()
673 if (spi->num_chipselect > SPI_DEVICE_CS_CNT_MAX) { in __spi_add_device()
674 dev_err(dev, "num_cs %d > max %d\n", spi->num_chipselect, in __spi_add_device()
676 return -EOVERFLOW; in __spi_add_device()
679 for (idx = 0; idx < spi->num_chipselect; idx++) { in __spi_add_device()
682 if (cs >= ctlr->num_chipselect) { in __spi_add_device()
684 ctlr->num_chipselect); in __spi_add_device()
685 return -EINVAL; in __spi_add_device()
691 * For example, spi->chip_select[0] != spi->chip_select[1] and so on. in __spi_add_device()
694 for (idx = 0; idx < spi->num_chipselect; idx++) { in __spi_add_device()
702 for (idx = spi->num_chipselect; idx < SPI_DEVICE_CS_CNT_MAX; idx++) in __spi_add_device()
705 /* Set the bus ID string */ in __spi_add_device()
719 !device_is_registered(&ctlr->dev)) { in __spi_add_device()
720 return -ENODEV; in __spi_add_device()
723 if (ctlr->cs_gpiods) { in __spi_add_device()
726 for (idx = 0; idx < spi->num_chipselect; idx++) { in __spi_add_device()
728 spi_set_csgpiod(spi, idx, ctlr->cs_gpiods[cs]); in __spi_add_device()
740 dev_name(&spi->dev), status); in __spi_add_device()
745 status = device_add(&spi->dev); in __spi_add_device()
748 dev_name(&spi->dev), status); in __spi_add_device()
751 dev_dbg(dev, "registered child %s\n", dev_name(&spi->dev)); in __spi_add_device()
758 * spi_add_device - Add spi_device allocated with spi_alloc_device
762 * spi_alloc_device can be added onto the SPI bus with this function.
768 struct spi_controller *ctlr = spi->controller; in spi_add_device()
771 /* Set the bus ID string */ in spi_add_device()
774 mutex_lock(&ctlr->add_lock); in spi_add_device()
776 mutex_unlock(&ctlr->add_lock); in spi_add_device()
782 * spi_new_device - instantiate one new SPI device
788 * after board init creates the hard-wired devices. Some development
791 * driver could add devices (which it would learn about out-of-band).
802 * NOTE: caller did any chip->bus_num checks necessary. in spi_new_device()
805 * error-or-pointer (not NULL-or-pointer), troubleshootability in spi_new_device()
813 WARN_ON(strlen(chip->modalias) >= sizeof(proxy->modalias)); in spi_new_device()
815 /* Use provided chip-select for proxy device */ in spi_new_device()
816 spi_set_chipselect(proxy, 0, chip->chip_select); in spi_new_device()
818 proxy->max_speed_hz = chip->max_speed_hz; in spi_new_device()
819 proxy->mode = chip->mode; in spi_new_device()
820 proxy->irq = chip->irq; in spi_new_device()
821 strscpy(proxy->modalias, chip->modalias, sizeof(proxy->modalias)); in spi_new_device()
822 proxy->dev.platform_data = (void *) chip->platform_data; in spi_new_device()
823 proxy->controller_data = chip->controller_data; in spi_new_device()
824 proxy->controller_state = NULL; in spi_new_device()
826 * By default spi->chip_select[0] will hold the physical CS number, in spi_new_device()
827 * so set bit 0 in spi->cs_index_mask. in spi_new_device()
829 proxy->cs_index_mask = BIT(0); in spi_new_device()
831 if (chip->swnode) { in spi_new_device()
832 status = device_add_software_node(&proxy->dev, chip->swnode); in spi_new_device()
834 dev_err(&ctlr->dev, "failed to add software node to '%s': %d\n", in spi_new_device()
835 chip->modalias, status); in spi_new_device()
847 device_remove_software_node(&proxy->dev); in spi_new_device()
854 * spi_unregister_device - unregister a single SPI device
867 fwnode = dev_fwnode(&spi->dev); in spi_unregister_device()
874 device_remove_software_node(&spi->dev); in spi_unregister_device()
875 device_del(&spi->dev); in spi_unregister_device()
877 put_device(&spi->dev); in spi_unregister_device()
886 if (ctlr->bus_num != bi->bus_num) in spi_match_controller_to_boardinfo()
891 dev_err(ctlr->dev.parent, "can't create new device for %s\n", in spi_match_controller_to_boardinfo()
892 bi->modalias); in spi_match_controller_to_boardinfo()
896 * spi_register_board_info - register SPI devices for a given board
901 * Board-specific early init code calls this (probably during arch_initcall)
905 * not make Linux forget about these hard-wired devices.
907 * Other code can also call this, e.g. a particular add-on board might provide
912 * any embedded pointers (platform_data, etc), they're copied as-is.
926 return -ENOMEM; in spi_register_board_info()
931 memcpy(&bi->board_info, info, sizeof(*info)); in spi_register_board_info()
934 list_add_tail(&bi->list, &board_list); in spi_register_board_info()
937 &bi->board_info); in spi_register_board_info()
944 /*-------------------------------------------------------------------------*/
949 * spi_res_alloc - allocate a spi resource that is life-cycle managed
971 INIT_LIST_HEAD(&sres->entry); in spi_res_alloc()
972 sres->release = release; in spi_res_alloc()
974 return sres->data; in spi_res_alloc()
978 * spi_res_free - free an SPI resource
985 WARN_ON(!list_empty(&sres->entry)); in spi_res_free()
990 * spi_res_add - add a spi_res to the spi_message
998 WARN_ON(!list_empty(&sres->entry)); in spi_res_add()
999 list_add_tail(&sres->entry, &message->resources); in spi_res_add()
1003 * spi_res_release - release all SPI resources for this message
1011 list_for_each_entry_safe_reverse(res, tmp, &message->resources, entry) { in spi_res_release()
1012 if (res->release) in spi_res_release()
1013 res->release(ctlr, message, res->data); in spi_res_release()
1015 list_del(&res->entry); in spi_res_release()
1021 /*-------------------------------------------------------------------------*/
1023 for (idx = 0; idx < spi->num_chipselect; idx++) \
1024 if (!(spi->cs_index_mask & BIT(idx))) {} else
1032 if (spi->controller->last_cs[idx] == spi_get_chipselect(spi, idx)) in spi_is_last_cs()
1042 * thus the SPISerialBus() resource defines it on the per-chip in spi_toggle_csgpiod()
1050 if (is_acpi_device_node(dev_fwnode(&spi->dev))) in spi_toggle_csgpiod()
1057 spi_delay_exec(&spi->cs_setup, NULL); in spi_toggle_csgpiod()
1059 spi_delay_exec(&spi->cs_inactive, NULL); in spi_toggle_csgpiod()
1072 (spi->controller->last_cs_index_mask == spi->cs_index_mask) && in spi_set_cs()
1073 (spi->controller->last_cs_mode_high == (spi->mode & SPI_CS_HIGH))) in spi_set_cs()
1078 spi->controller->last_cs_index_mask = spi->cs_index_mask; in spi_set_cs()
1080 if (enable && idx < spi->num_chipselect) in spi_set_cs()
1081 spi->controller->last_cs[idx] = spi_get_chipselect(spi, 0); in spi_set_cs()
1083 spi->controller->last_cs[idx] = SPI_INVALID_CS; in spi_set_cs()
1086 spi->controller->last_cs_mode_high = spi->mode & SPI_CS_HIGH; in spi_set_cs()
1087 if (spi->controller->last_cs_mode_high) in spi_set_cs()
1094 if ((spi_is_csgpiod(spi) || !spi->controller->set_cs_timing) && !activate) in spi_set_cs()
1095 spi_delay_exec(&spi->cs_hold, NULL); in spi_set_cs()
1098 if (!(spi->mode & SPI_NO_CS)) { in spi_set_cs()
1104 /* Some SPI controllers need both GPIO CS & ->set_cs() */ in spi_set_cs()
1105 if ((spi->controller->flags & SPI_CONTROLLER_GPIO_SS) && in spi_set_cs()
1106 spi->controller->set_cs) in spi_set_cs()
1107 spi->controller->set_cs(spi, !enable); in spi_set_cs()
1108 } else if (spi->controller->set_cs) { in spi_set_cs()
1109 spi->controller->set_cs(spi, !enable); in spi_set_cs()
1112 if (spi_is_csgpiod(spi) || !spi->controller->set_cs_timing) { in spi_set_cs()
1114 spi_delay_exec(&spi->cs_setup, NULL); in spi_set_cs()
1116 spi_delay_exec(&spi->cs_inactive, NULL); in spi_set_cs()
1146 desc_len = min_t(size_t, max_seg_size, ctlr->max_dma_len); in spi_map_buf_attrs()
1149 return -EINVAL; in spi_map_buf_attrs()
1156 sg = &sgt->sgl[0]; in spi_map_buf_attrs()
1167 PAGE_SIZE - offset_in_page(buf))); in spi_map_buf_attrs()
1174 return -ENOMEM; in spi_map_buf_attrs()
1185 len -= min; in spi_map_buf_attrs()
1212 sgt->orig_nents = 0; in spi_unmap_buf_attrs()
1213 sgt->nents = 0; in spi_unmap_buf_attrs()
1228 if (!ctlr->can_dma) in __spi_map_msg()
1231 if (ctlr->dma_tx) in __spi_map_msg()
1232 tx_dev = ctlr->dma_tx->device->dev; in __spi_map_msg()
1233 else if (ctlr->dma_map_dev) in __spi_map_msg()
1234 tx_dev = ctlr->dma_map_dev; in __spi_map_msg()
1236 tx_dev = ctlr->dev.parent; in __spi_map_msg()
1238 if (ctlr->dma_rx) in __spi_map_msg()
1239 rx_dev = ctlr->dma_rx->device->dev; in __spi_map_msg()
1240 else if (ctlr->dma_map_dev) in __spi_map_msg()
1241 rx_dev = ctlr->dma_map_dev; in __spi_map_msg()
1243 rx_dev = ctlr->dev.parent; in __spi_map_msg()
1245 ret = -ENOMSG; in __spi_map_msg()
1246 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_map_msg()
1250 if (!ctlr->can_dma(ctlr, msg->spi, xfer)) in __spi_map_msg()
1253 if (xfer->tx_buf != NULL) { in __spi_map_msg()
1254 ret = spi_map_buf_attrs(ctlr, tx_dev, &xfer->tx_sg, in __spi_map_msg()
1255 (void *)xfer->tx_buf, in __spi_map_msg()
1256 xfer->len, DMA_TO_DEVICE, in __spi_map_msg()
1261 xfer->tx_sg_mapped = true; in __spi_map_msg()
1264 if (xfer->rx_buf != NULL) { in __spi_map_msg()
1265 ret = spi_map_buf_attrs(ctlr, rx_dev, &xfer->rx_sg, in __spi_map_msg()
1266 xfer->rx_buf, xfer->len, in __spi_map_msg()
1270 &xfer->tx_sg, DMA_TO_DEVICE, in __spi_map_msg()
1276 xfer->rx_sg_mapped = true; in __spi_map_msg()
1283 ctlr->cur_rx_dma_dev = rx_dev; in __spi_map_msg()
1284 ctlr->cur_tx_dma_dev = tx_dev; in __spi_map_msg()
1291 struct device *rx_dev = ctlr->cur_rx_dma_dev; in __spi_unmap_msg()
1292 struct device *tx_dev = ctlr->cur_tx_dma_dev; in __spi_unmap_msg()
1295 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_unmap_msg()
1299 if (xfer->rx_sg_mapped) in __spi_unmap_msg()
1300 spi_unmap_buf_attrs(ctlr, rx_dev, &xfer->rx_sg, in __spi_unmap_msg()
1302 xfer->rx_sg_mapped = false; in __spi_unmap_msg()
1304 if (xfer->tx_sg_mapped) in __spi_unmap_msg()
1305 spi_unmap_buf_attrs(ctlr, tx_dev, &xfer->tx_sg, in __spi_unmap_msg()
1307 xfer->tx_sg_mapped = false; in __spi_unmap_msg()
1316 struct device *rx_dev = ctlr->cur_rx_dma_dev; in spi_dma_sync_for_device()
1317 struct device *tx_dev = ctlr->cur_tx_dma_dev; in spi_dma_sync_for_device()
1319 if (xfer->tx_sg_mapped) in spi_dma_sync_for_device()
1320 dma_sync_sgtable_for_device(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE); in spi_dma_sync_for_device()
1321 if (xfer->rx_sg_mapped) in spi_dma_sync_for_device()
1322 dma_sync_sgtable_for_device(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE); in spi_dma_sync_for_device()
1328 struct device *rx_dev = ctlr->cur_rx_dma_dev; in spi_dma_sync_for_cpu()
1329 struct device *tx_dev = ctlr->cur_tx_dma_dev; in spi_dma_sync_for_cpu()
1331 if (xfer->rx_sg_mapped) in spi_dma_sync_for_cpu()
1332 dma_sync_sgtable_for_cpu(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE); in spi_dma_sync_for_cpu()
1333 if (xfer->tx_sg_mapped) in spi_dma_sync_for_cpu()
1334 dma_sync_sgtable_for_cpu(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE); in spi_dma_sync_for_cpu()
1365 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_unmap_msg()
1370 if (xfer->tx_buf == ctlr->dummy_tx) in spi_unmap_msg()
1371 xfer->tx_buf = NULL; in spi_unmap_msg()
1372 if (xfer->rx_buf == ctlr->dummy_rx) in spi_unmap_msg()
1373 xfer->rx_buf = NULL; in spi_unmap_msg()
1385 if ((ctlr->flags & (SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX)) in spi_map_msg()
1386 && !(msg->spi->mode & SPI_3WIRE)) { in spi_map_msg()
1390 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_map_msg()
1391 if ((ctlr->flags & SPI_CONTROLLER_MUST_TX) && in spi_map_msg()
1392 !xfer->tx_buf) in spi_map_msg()
1393 max_tx = max(xfer->len, max_tx); in spi_map_msg()
1394 if ((ctlr->flags & SPI_CONTROLLER_MUST_RX) && in spi_map_msg()
1395 !xfer->rx_buf) in spi_map_msg()
1396 max_rx = max(xfer->len, max_rx); in spi_map_msg()
1400 tmp = krealloc(ctlr->dummy_tx, max_tx, in spi_map_msg()
1403 return -ENOMEM; in spi_map_msg()
1404 ctlr->dummy_tx = tmp; in spi_map_msg()
1408 tmp = krealloc(ctlr->dummy_rx, max_rx, in spi_map_msg()
1411 return -ENOMEM; in spi_map_msg()
1412 ctlr->dummy_rx = tmp; in spi_map_msg()
1416 list_for_each_entry(xfer, &msg->transfers, in spi_map_msg()
1418 if (!xfer->len) in spi_map_msg()
1420 if (!xfer->tx_buf) in spi_map_msg()
1421 xfer->tx_buf = ctlr->dummy_tx; in spi_map_msg()
1422 if (!xfer->rx_buf) in spi_map_msg()
1423 xfer->rx_buf = ctlr->dummy_rx; in spi_map_msg()
1435 struct spi_statistics __percpu *statm = ctlr->pcpu_statistics; in spi_transfer_wait()
1436 struct spi_statistics __percpu *stats = msg->spi->pcpu_statistics; in spi_transfer_wait()
1437 u32 speed_hz = xfer->speed_hz; in spi_transfer_wait()
1441 if (wait_for_completion_interruptible(&ctlr->xfer_completion)) { in spi_transfer_wait()
1442 dev_dbg(&msg->spi->dev, "SPI transfer interrupted\n"); in spi_transfer_wait()
1443 return -EINTR; in spi_transfer_wait()
1455 ms = 8LL * MSEC_PER_SEC * xfer->len; in spi_transfer_wait()
1466 ms = wait_for_completion_timeout(&ctlr->xfer_completion, in spi_transfer_wait()
1472 dev_err(&msg->spi->dev, in spi_transfer_wait()
1474 return -ETIMEDOUT; in spi_transfer_wait()
1477 if (xfer->error & SPI_TRANS_FAIL_IO) in spi_transfer_wait()
1478 return -EIO; in spi_transfer_wait()
1499 u32 delay = _delay->value; in spi_delay_to_ns()
1500 u32 unit = _delay->unit; in spi_delay_to_ns()
1516 return -EINVAL; in spi_delay_to_ns()
1521 hz = xfer->effective_speed_hz ?: xfer->speed_hz / 2; in spi_delay_to_ns()
1523 return -EINVAL; in spi_delay_to_ns()
1529 return -EINVAL; in spi_delay_to_ns()
1543 return -EINVAL; in spi_delay_exec()
1559 u32 delay = xfer->cs_change_delay.value; in _spi_transfer_cs_change_delay()
1560 u32 unit = xfer->cs_change_delay.unit; in _spi_transfer_cs_change_delay()
1563 /* Return early on "fast" mode - for everything but USECS */ in _spi_transfer_cs_change_delay()
1570 ret = spi_delay_exec(&xfer->cs_change_delay, xfer); in _spi_transfer_cs_change_delay()
1572 dev_err_once(&msg->spi->dev, in _spi_transfer_cs_change_delay()
1587 * spi_transfer_one_message - Default implementation of transfer_one_message()
1599 struct spi_statistics __percpu *statm = ctlr->pcpu_statistics; in spi_transfer_one_message()
1600 struct spi_statistics __percpu *stats = msg->spi->pcpu_statistics; in spi_transfer_one_message()
1602 xfer = list_first_entry(&msg->transfers, struct spi_transfer, transfer_list); in spi_transfer_one_message()
1603 spi_set_cs(msg->spi, !xfer->cs_off, false); in spi_transfer_one_message()
1608 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_transfer_one_message()
1614 if (!ctlr->ptp_sts_supported) { in spi_transfer_one_message()
1615 xfer->ptp_sts_word_pre = 0; in spi_transfer_one_message()
1616 ptp_read_system_prets(xfer->ptp_sts); in spi_transfer_one_message()
1619 if ((xfer->tx_buf || xfer->rx_buf) && xfer->len) { in spi_transfer_one_message()
1620 reinit_completion(&ctlr->xfer_completion); in spi_transfer_one_message()
1624 ret = ctlr->transfer_one(ctlr, msg->spi, xfer); in spi_transfer_one_message()
1628 if ((xfer->tx_sg_mapped || xfer->rx_sg_mapped) && in spi_transfer_one_message()
1629 (xfer->error & SPI_TRANS_FAIL_NO_START)) { in spi_transfer_one_message()
1631 ctlr->fallback = true; in spi_transfer_one_message()
1632 xfer->error &= ~SPI_TRANS_FAIL_NO_START; in spi_transfer_one_message()
1640 dev_err(&msg->spi->dev, in spi_transfer_one_message()
1648 msg->status = ret; in spi_transfer_one_message()
1653 if (xfer->len) in spi_transfer_one_message()
1654 dev_err(&msg->spi->dev, in spi_transfer_one_message()
1656 xfer->len); in spi_transfer_one_message()
1659 if (!ctlr->ptp_sts_supported) { in spi_transfer_one_message()
1660 ptp_read_system_postts(xfer->ptp_sts); in spi_transfer_one_message()
1661 xfer->ptp_sts_word_post = xfer->len; in spi_transfer_one_message()
1666 if (msg->status != -EINPROGRESS) in spi_transfer_one_message()
1671 if (xfer->cs_change) { in spi_transfer_one_message()
1672 if (list_is_last(&xfer->transfer_list, in spi_transfer_one_message()
1673 &msg->transfers)) { in spi_transfer_one_message()
1676 if (!xfer->cs_off) in spi_transfer_one_message()
1677 spi_set_cs(msg->spi, false, false); in spi_transfer_one_message()
1679 if (!list_next_entry(xfer, transfer_list)->cs_off) in spi_transfer_one_message()
1680 spi_set_cs(msg->spi, true, false); in spi_transfer_one_message()
1682 } else if (!list_is_last(&xfer->transfer_list, &msg->transfers) && in spi_transfer_one_message()
1683 xfer->cs_off != list_next_entry(xfer, transfer_list)->cs_off) { in spi_transfer_one_message()
1684 spi_set_cs(msg->spi, xfer->cs_off, false); in spi_transfer_one_message()
1687 msg->actual_length += xfer->len; in spi_transfer_one_message()
1692 spi_set_cs(msg->spi, false, false); in spi_transfer_one_message()
1694 if (msg->status == -EINPROGRESS) in spi_transfer_one_message()
1695 msg->status = ret; in spi_transfer_one_message()
1697 if (msg->status && ctlr->handle_err) in spi_transfer_one_message()
1698 ctlr->handle_err(ctlr, msg); in spi_transfer_one_message()
1706 * spi_finalize_current_transfer - report completion of a transfer
1715 complete(&ctlr->xfer_completion); in spi_finalize_current_transfer()
1721 if (ctlr->auto_runtime_pm) { in spi_idle_runtime_pm()
1722 pm_runtime_put_autosuspend(ctlr->dev.parent); in spi_idle_runtime_pm()
1732 if (!was_busy && ctlr->auto_runtime_pm) { in __spi_pump_transfer_message()
1733 ret = pm_runtime_get_sync(ctlr->dev.parent); in __spi_pump_transfer_message()
1735 pm_runtime_put_noidle(ctlr->dev.parent); in __spi_pump_transfer_message()
1736 dev_err(&ctlr->dev, "Failed to power device: %d\n", in __spi_pump_transfer_message()
1739 msg->status = ret; in __spi_pump_transfer_message()
1749 if (!was_busy && ctlr->prepare_transfer_hardware) { in __spi_pump_transfer_message()
1750 ret = ctlr->prepare_transfer_hardware(ctlr); in __spi_pump_transfer_message()
1752 dev_err(&ctlr->dev, in __spi_pump_transfer_message()
1756 if (ctlr->auto_runtime_pm) in __spi_pump_transfer_message()
1757 pm_runtime_put(ctlr->dev.parent); in __spi_pump_transfer_message()
1759 msg->status = ret; in __spi_pump_transfer_message()
1768 if (ctlr->prepare_message) { in __spi_pump_transfer_message()
1769 ret = ctlr->prepare_message(ctlr, msg); in __spi_pump_transfer_message()
1771 dev_err(&ctlr->dev, "failed to prepare message: %d\n", in __spi_pump_transfer_message()
1773 msg->status = ret; in __spi_pump_transfer_message()
1777 msg->prepared = true; in __spi_pump_transfer_message()
1782 msg->status = ret; in __spi_pump_transfer_message()
1787 if (!ctlr->ptp_sts_supported && !ctlr->transfer_one) { in __spi_pump_transfer_message()
1788 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in __spi_pump_transfer_message()
1789 xfer->ptp_sts_word_pre = 0; in __spi_pump_transfer_message()
1790 ptp_read_system_prets(xfer->ptp_sts); in __spi_pump_transfer_message()
1800 * ctlr->cur_msg. in __spi_pump_transfer_message()
1807 WRITE_ONCE(ctlr->cur_msg_incomplete, true); in __spi_pump_transfer_message()
1808 WRITE_ONCE(ctlr->cur_msg_need_completion, false); in __spi_pump_transfer_message()
1809 reinit_completion(&ctlr->cur_msg_completion); in __spi_pump_transfer_message()
1812 ret = ctlr->transfer_one_message(ctlr, msg); in __spi_pump_transfer_message()
1814 dev_err(&ctlr->dev, in __spi_pump_transfer_message()
1819 WRITE_ONCE(ctlr->cur_msg_need_completion, true); in __spi_pump_transfer_message()
1821 if (READ_ONCE(ctlr->cur_msg_incomplete)) in __spi_pump_transfer_message()
1822 wait_for_completion(&ctlr->cur_msg_completion); in __spi_pump_transfer_message()
1828 * __spi_pump_messages - function which processes SPI message queue
1848 mutex_lock(&ctlr->io_mutex); in __spi_pump_messages()
1851 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_pump_messages()
1854 if (ctlr->cur_msg) in __spi_pump_messages()
1858 if (list_empty(&ctlr->queue) || !ctlr->running) { in __spi_pump_messages()
1859 if (!ctlr->busy) in __spi_pump_messages()
1862 /* Defer any non-atomic teardown to the thread */ in __spi_pump_messages()
1864 if (!ctlr->dummy_rx && !ctlr->dummy_tx && in __spi_pump_messages()
1865 !ctlr->unprepare_transfer_hardware) { in __spi_pump_messages()
1867 ctlr->busy = false; in __spi_pump_messages()
1868 ctlr->queue_empty = true; in __spi_pump_messages()
1871 kthread_queue_work(ctlr->kworker, in __spi_pump_messages()
1872 &ctlr->pump_messages); in __spi_pump_messages()
1877 ctlr->busy = false; in __spi_pump_messages()
1878 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1880 kfree(ctlr->dummy_rx); in __spi_pump_messages()
1881 ctlr->dummy_rx = NULL; in __spi_pump_messages()
1882 kfree(ctlr->dummy_tx); in __spi_pump_messages()
1883 ctlr->dummy_tx = NULL; in __spi_pump_messages()
1884 if (ctlr->unprepare_transfer_hardware && in __spi_pump_messages()
1885 ctlr->unprepare_transfer_hardware(ctlr)) in __spi_pump_messages()
1886 dev_err(&ctlr->dev, in __spi_pump_messages()
1891 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_pump_messages()
1892 ctlr->queue_empty = true; in __spi_pump_messages()
1897 msg = list_first_entry(&ctlr->queue, struct spi_message, queue); in __spi_pump_messages()
1898 ctlr->cur_msg = msg; in __spi_pump_messages()
1900 list_del_init(&msg->queue); in __spi_pump_messages()
1901 if (ctlr->busy) in __spi_pump_messages()
1904 ctlr->busy = true; in __spi_pump_messages()
1905 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1908 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in __spi_pump_messages()
1910 ctlr->cur_msg = NULL; in __spi_pump_messages()
1911 ctlr->fallback = false; in __spi_pump_messages()
1913 mutex_unlock(&ctlr->io_mutex); in __spi_pump_messages()
1921 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_pump_messages()
1922 mutex_unlock(&ctlr->io_mutex); in __spi_pump_messages()
1926 * spi_pump_messages - kthread work function which processes spi message queue
1938 * spi_take_timestamp_pre - helper to collect the beginning of the TX timestamp
1961 if (!xfer->ptp_sts) in spi_take_timestamp_pre()
1964 if (xfer->timestamped) in spi_take_timestamp_pre()
1967 if (progress > xfer->ptp_sts_word_pre) in spi_take_timestamp_pre()
1971 xfer->ptp_sts_word_pre = progress; in spi_take_timestamp_pre()
1974 local_irq_save(ctlr->irq_flags); in spi_take_timestamp_pre()
1978 ptp_read_system_prets(xfer->ptp_sts); in spi_take_timestamp_pre()
1983 * spi_take_timestamp_post - helper to collect the end of the TX timestamp
1987 * @irqs_off: If true, will re-enable IRQs and preemption for the local CPU.
1998 if (!xfer->ptp_sts) in spi_take_timestamp_post()
2001 if (xfer->timestamped) in spi_take_timestamp_post()
2004 if (progress < xfer->ptp_sts_word_post) in spi_take_timestamp_post()
2007 ptp_read_system_postts(xfer->ptp_sts); in spi_take_timestamp_post()
2010 local_irq_restore(ctlr->irq_flags); in spi_take_timestamp_post()
2015 xfer->ptp_sts_word_post = progress; in spi_take_timestamp_post()
2017 xfer->timestamped = 1; in spi_take_timestamp_post()
2022 * spi_set_thread_rt - set the controller to pump at realtime priority
2026 * (by setting the ->rt value before calling spi_register_controller()) or
2027 * because a device on the bus said that its transfers needed realtime
2030 * NOTE: at the moment if any device on a bus says it needs realtime then
2038 dev_info(&ctlr->dev, in spi_set_thread_rt()
2040 sched_set_fifo(ctlr->kworker->task); in spi_set_thread_rt()
2045 ctlr->running = false; in spi_init_queue()
2046 ctlr->busy = false; in spi_init_queue()
2047 ctlr->queue_empty = true; in spi_init_queue()
2049 ctlr->kworker = kthread_run_worker(0, dev_name(&ctlr->dev)); in spi_init_queue()
2050 if (IS_ERR(ctlr->kworker)) { in spi_init_queue()
2051 dev_err(&ctlr->dev, "failed to create message pump kworker\n"); in spi_init_queue()
2052 return PTR_ERR(ctlr->kworker); in spi_init_queue()
2055 kthread_init_work(&ctlr->pump_messages, spi_pump_messages); in spi_init_queue()
2060 * latency on the bus by minimising the delay between a transfer in spi_init_queue()
2064 if (ctlr->rt) in spi_init_queue()
2071 * spi_get_next_queued_message() - called by driver to check for queued
2086 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_get_next_queued_message()
2087 next = list_first_entry_or_null(&ctlr->queue, struct spi_message, in spi_get_next_queued_message()
2089 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_get_next_queued_message()
2096 * __spi_unoptimize_message - shared implementation of spi_unoptimize_message()
2108 struct spi_controller *ctlr = msg->spi->controller; in __spi_unoptimize_message()
2110 if (ctlr->unoptimize_message) in __spi_unoptimize_message()
2111 ctlr->unoptimize_message(msg); in __spi_unoptimize_message()
2115 msg->optimized = false; in __spi_unoptimize_message()
2116 msg->opt_state = NULL; in __spi_unoptimize_message()
2120 * spi_maybe_unoptimize_message - unoptimize msg not managed by a peripheral
2128 if (!msg->pre_optimized && msg->optimized && in spi_maybe_unoptimize_message()
2129 !msg->spi->controller->defer_optimize_message) in spi_maybe_unoptimize_message()
2134 * spi_finalize_current_message() - the current message is complete
2146 mesg = ctlr->cur_msg; in spi_finalize_current_message()
2148 if (!ctlr->ptp_sts_supported && !ctlr->transfer_one) { in spi_finalize_current_message()
2149 list_for_each_entry(xfer, &mesg->transfers, transfer_list) { in spi_finalize_current_message()
2150 ptp_read_system_postts(xfer->ptp_sts); in spi_finalize_current_message()
2151 xfer->ptp_sts_word_post = xfer->len; in spi_finalize_current_message()
2155 if (unlikely(ctlr->ptp_sts_supported)) in spi_finalize_current_message()
2156 list_for_each_entry(xfer, &mesg->transfers, transfer_list) in spi_finalize_current_message()
2157 WARN_ON_ONCE(xfer->ptp_sts && !xfer->timestamped); in spi_finalize_current_message()
2161 if (mesg->prepared && ctlr->unprepare_message) { in spi_finalize_current_message()
2162 ret = ctlr->unprepare_message(ctlr, mesg); in spi_finalize_current_message()
2164 dev_err(&ctlr->dev, "failed to unprepare message: %d\n", in spi_finalize_current_message()
2169 mesg->prepared = false; in spi_finalize_current_message()
2173 WRITE_ONCE(ctlr->cur_msg_incomplete, false); in spi_finalize_current_message()
2175 if (READ_ONCE(ctlr->cur_msg_need_completion)) in spi_finalize_current_message()
2176 complete(&ctlr->cur_msg_completion); in spi_finalize_current_message()
2180 mesg->state = NULL; in spi_finalize_current_message()
2181 if (mesg->complete) in spi_finalize_current_message()
2182 mesg->complete(mesg->context); in spi_finalize_current_message()
2190 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_start_queue()
2192 if (ctlr->running || ctlr->busy) { in spi_start_queue()
2193 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_start_queue()
2194 return -EBUSY; in spi_start_queue()
2197 ctlr->running = true; in spi_start_queue()
2198 ctlr->cur_msg = NULL; in spi_start_queue()
2199 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_start_queue()
2201 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in spi_start_queue()
2213 * A wait_queue on the ctlr->busy could be used, but then the common in spi_stop_queue()
2218 spin_lock_irqsave(&ctlr->queue_lock, flags); in spi_stop_queue()
2219 if (list_empty(&ctlr->queue) && !ctlr->busy) { in spi_stop_queue()
2220 ctlr->running = false; in spi_stop_queue()
2221 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_stop_queue()
2224 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in spi_stop_queue()
2226 } while (--limit); in spi_stop_queue()
2228 return -EBUSY; in spi_stop_queue()
2244 dev_err(&ctlr->dev, "problem destroying queue\n"); in spi_destroy_queue()
2248 kthread_destroy_worker(ctlr->kworker); in spi_destroy_queue()
2257 struct spi_controller *ctlr = spi->controller; in __spi_queued_transfer()
2260 spin_lock_irqsave(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2262 if (!ctlr->running) { in __spi_queued_transfer()
2263 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2264 return -ESHUTDOWN; in __spi_queued_transfer()
2266 msg->actual_length = 0; in __spi_queued_transfer()
2267 msg->status = -EINPROGRESS; in __spi_queued_transfer()
2269 list_add_tail(&msg->queue, &ctlr->queue); in __spi_queued_transfer()
2270 ctlr->queue_empty = false; in __spi_queued_transfer()
2271 if (!ctlr->busy && need_pump) in __spi_queued_transfer()
2272 kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); in __spi_queued_transfer()
2274 spin_unlock_irqrestore(&ctlr->queue_lock, flags); in __spi_queued_transfer()
2279 * spi_queued_transfer - transfer function for queued transfers
2294 ctlr->transfer = spi_queued_transfer; in spi_controller_initialize_queue()
2295 if (!ctlr->transfer_one_message) in spi_controller_initialize_queue()
2296 ctlr->transfer_one_message = spi_transfer_one_message; in spi_controller_initialize_queue()
2301 dev_err(&ctlr->dev, "problem initializing queue\n"); in spi_controller_initialize_queue()
2304 ctlr->queued = true; in spi_controller_initialize_queue()
2307 dev_err(&ctlr->dev, "problem starting queue\n"); in spi_controller_initialize_queue()
2320 * spi_flush_queue - Send all pending messages in the queue from the callers'
2325 * sent before doing something. Is used by the spi-mem code to make sure SPI
2327 * before the spi-mem operation.
2331 if (ctlr->transfer == spi_queued_transfer) in spi_flush_queue()
2335 /*-------------------------------------------------------------------------*/
2345 delay->value = DIV_ROUND_UP(value, 1000); in of_spi_parse_dt_cs_delay()
2346 delay->unit = SPI_DELAY_UNIT_USECS; in of_spi_parse_dt_cs_delay()
2348 delay->value = value; in of_spi_parse_dt_cs_delay()
2349 delay->unit = SPI_DELAY_UNIT_NSECS; in of_spi_parse_dt_cs_delay()
2361 if (of_property_read_bool(nc, "spi-cpha")) in of_spi_parse_dt()
2362 spi->mode |= SPI_CPHA; in of_spi_parse_dt()
2363 if (of_property_read_bool(nc, "spi-cpol")) in of_spi_parse_dt()
2364 spi->mode |= SPI_CPOL; in of_spi_parse_dt()
2365 if (of_property_read_bool(nc, "spi-3wire")) in of_spi_parse_dt()
2366 spi->mode |= SPI_3WIRE; in of_spi_parse_dt()
2367 if (of_property_read_bool(nc, "spi-lsb-first")) in of_spi_parse_dt()
2368 spi->mode |= SPI_LSB_FIRST; in of_spi_parse_dt()
2369 if (of_property_read_bool(nc, "spi-cs-high")) in of_spi_parse_dt()
2370 spi->mode |= SPI_CS_HIGH; in of_spi_parse_dt()
2373 if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { in of_spi_parse_dt()
2376 spi->mode |= SPI_NO_TX; in of_spi_parse_dt()
2381 spi->mode |= SPI_TX_DUAL; in of_spi_parse_dt()
2384 spi->mode |= SPI_TX_QUAD; in of_spi_parse_dt()
2387 spi->mode |= SPI_TX_OCTAL; in of_spi_parse_dt()
2390 dev_warn(&ctlr->dev, in of_spi_parse_dt()
2391 "spi-tx-bus-width %d not supported\n", in of_spi_parse_dt()
2397 if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) { in of_spi_parse_dt()
2400 spi->mode |= SPI_NO_RX; in of_spi_parse_dt()
2405 spi->mode |= SPI_RX_DUAL; in of_spi_parse_dt()
2408 spi->mode |= SPI_RX_QUAD; in of_spi_parse_dt()
2411 spi->mode |= SPI_RX_OCTAL; in of_spi_parse_dt()
2414 dev_warn(&ctlr->dev, in of_spi_parse_dt()
2415 "spi-rx-bus-width %d not supported\n", in of_spi_parse_dt()
2423 dev_err(&ctlr->dev, "%pOF is not called 'slave'\n", in of_spi_parse_dt()
2425 return -EINVAL; in of_spi_parse_dt()
2434 dev_err(&ctlr->dev, "%pOF has no valid 'reg' property (%d)\n", in of_spi_parse_dt()
2439 if ((of_property_present(nc, "parallel-memories")) && in of_spi_parse_dt()
2440 (!(ctlr->flags & SPI_CONTROLLER_MULTI_CS))) { in of_spi_parse_dt()
2441 dev_err(&ctlr->dev, "SPI controller doesn't support multi CS\n"); in of_spi_parse_dt()
2442 return -EINVAL; in of_spi_parse_dt()
2445 spi->num_chipselect = rc; in of_spi_parse_dt()
2450 * By default spi->chip_select[0] will hold the physical CS number, in of_spi_parse_dt()
2451 * so set bit 0 in spi->cs_index_mask. in of_spi_parse_dt()
2453 spi->cs_index_mask = BIT(0); in of_spi_parse_dt()
2456 if (!of_property_read_u32(nc, "spi-max-frequency", &value)) in of_spi_parse_dt()
2457 spi->max_speed_hz = value; in of_spi_parse_dt()
2460 of_spi_parse_dt_cs_delay(nc, &spi->cs_setup, "spi-cs-setup-delay-ns"); in of_spi_parse_dt()
2461 of_spi_parse_dt_cs_delay(nc, &spi->cs_hold, "spi-cs-hold-delay-ns"); in of_spi_parse_dt()
2462 of_spi_parse_dt_cs_delay(nc, &spi->cs_inactive, "spi-cs-inactive-delay-ns"); in of_spi_parse_dt()
2476 dev_err(&ctlr->dev, "spi_device alloc error for %pOF\n", nc); in of_register_spi_device()
2477 rc = -ENOMEM; in of_register_spi_device()
2482 rc = of_alias_from_compatible(nc, spi->modalias, in of_register_spi_device()
2483 sizeof(spi->modalias)); in of_register_spi_device()
2485 dev_err(&ctlr->dev, "cannot find modalias for %pOF\n", nc); in of_register_spi_device()
2496 device_set_node(&spi->dev, of_fwnode_handle(nc)); in of_register_spi_device()
2501 dev_err(&ctlr->dev, "spi_device register error %pOF\n", nc); in of_register_spi_device()
2515 * of_register_spi_devices() - Register child devices onto the SPI bus
2526 for_each_available_child_of_node(ctlr->dev.of_node, nc) { in of_register_spi_devices()
2531 dev_warn(&ctlr->dev, in of_register_spi_devices()
2542 * spi_new_ancillary_device() - Register ancillary SPI device
2546 * Register an ancillary SPI device; for example some chips have a chip-select
2556 struct spi_controller *ctlr = spi->controller; in spi_new_ancillary_device()
2563 rc = -ENOMEM; in spi_new_ancillary_device()
2567 strscpy(ancillary->modalias, "dummy", sizeof(ancillary->modalias)); in spi_new_ancillary_device()
2569 /* Use provided chip-select for ancillary device */ in spi_new_ancillary_device()
2573 ancillary->max_speed_hz = spi->max_speed_hz; in spi_new_ancillary_device()
2574 ancillary->mode = spi->mode; in spi_new_ancillary_device()
2576 * By default spi->chip_select[0] will hold the physical CS number, in spi_new_ancillary_device()
2577 * so set bit 0 in spi->cs_index_mask. in spi_new_ancillary_device()
2579 ancillary->cs_index_mask = BIT(0); in spi_new_ancillary_device()
2581 WARN_ON(!mutex_is_locked(&ctlr->add_lock)); in spi_new_ancillary_device()
2586 dev_err(&spi->dev, "failed to register ancillary device\n"); in spi_new_ancillary_device()
2615 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) in acpi_spi_count()
2618 sb = &ares->data.spi_serial_bus; in acpi_spi_count()
2619 if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_SPI) in acpi_spi_count()
2628 * acpi_spi_count_resources - Count the number of SpiSerialBus resources
2631 * Return: the number of SpiSerialBus resources in the ACPI-device's
2632 * resource-list; or a negative error code.
2659 && obj->buffer.length >= 4) in acpi_spi_parse_apple_properties()
2660 lookup->max_speed_hz = NSEC_PER_SEC / *(u32 *)obj->buffer.pointer; in acpi_spi_parse_apple_properties()
2663 && obj->buffer.length == 8) in acpi_spi_parse_apple_properties()
2664 lookup->bits_per_word = *(u64 *)obj->buffer.pointer; in acpi_spi_parse_apple_properties()
2667 && obj->buffer.length == 8 && !*(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2668 lookup->mode |= SPI_LSB_FIRST; in acpi_spi_parse_apple_properties()
2671 && obj->buffer.length == 8 && *(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2672 lookup->mode |= SPI_CPOL; in acpi_spi_parse_apple_properties()
2675 && obj->buffer.length == 8 && *(u64 *)obj->buffer.pointer) in acpi_spi_parse_apple_properties()
2676 lookup->mode |= SPI_CPHA; in acpi_spi_parse_apple_properties()
2682 struct spi_controller *ctlr = lookup->ctlr; in acpi_spi_add_resource()
2684 if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { in acpi_spi_add_resource()
2689 sb = &ares->data.spi_serial_bus; in acpi_spi_add_resource()
2690 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_SPI) { in acpi_spi_add_resource()
2692 if (lookup->index != -1 && lookup->n++ != lookup->index) in acpi_spi_add_resource()
2696 sb->resource_source.string_ptr, in acpi_spi_add_resource()
2700 return -ENODEV; in acpi_spi_add_resource()
2703 if (!device_match_acpi_handle(ctlr->dev.parent, parent_handle)) in acpi_spi_add_resource()
2704 return -ENODEV; in acpi_spi_add_resource()
2710 return -ENODEV; in acpi_spi_add_resource()
2714 return -EPROBE_DEFER; in acpi_spi_add_resource()
2716 lookup->ctlr = ctlr; in acpi_spi_add_resource()
2723 * 0 .. max - 1 so we need to ask the driver to in acpi_spi_add_resource()
2726 if (ctlr->fw_translate_cs) { in acpi_spi_add_resource()
2727 int cs = ctlr->fw_translate_cs(ctlr, in acpi_spi_add_resource()
2728 sb->device_selection); in acpi_spi_add_resource()
2731 lookup->chip_select = cs; in acpi_spi_add_resource()
2733 lookup->chip_select = sb->device_selection; in acpi_spi_add_resource()
2736 lookup->max_speed_hz = sb->connection_speed; in acpi_spi_add_resource()
2737 lookup->bits_per_word = sb->data_bit_length; in acpi_spi_add_resource()
2739 if (sb->clock_phase == ACPI_SPI_SECOND_PHASE) in acpi_spi_add_resource()
2740 lookup->mode |= SPI_CPHA; in acpi_spi_add_resource()
2741 if (sb->clock_polarity == ACPI_SPI_START_HIGH) in acpi_spi_add_resource()
2742 lookup->mode |= SPI_CPOL; in acpi_spi_add_resource()
2743 if (sb->device_polarity == ACPI_SPI_ACTIVE_HIGH) in acpi_spi_add_resource()
2744 lookup->mode |= SPI_CS_HIGH; in acpi_spi_add_resource()
2746 } else if (lookup->irq < 0) { in acpi_spi_add_resource()
2750 lookup->irq = r.start; in acpi_spi_add_resource()
2758 * acpi_spi_device_alloc - Allocate a spi device, and fill it in with ACPI information
2768 * If index is set to -1, index is not used.
2769 * Note: If index is -1, ctlr must be set.
2783 if (!ctlr && index == -1) in acpi_spi_device_alloc()
2784 return ERR_PTR(-EINVAL); in acpi_spi_device_alloc()
2787 lookup.irq = -1; in acpi_spi_device_alloc()
2801 ACPI_SUCCESS(acpi_get_parent(adev->handle, &parent_handle)) && in acpi_spi_device_alloc()
2802 device_match_acpi_handle(lookup.ctlr->dev.parent, parent_handle)) { in acpi_spi_device_alloc()
2808 return ERR_PTR(-ENODEV); in acpi_spi_device_alloc()
2812 dev_err(&lookup.ctlr->dev, "failed to allocate SPI device for %s\n", in acpi_spi_device_alloc()
2813 dev_name(&adev->dev)); in acpi_spi_device_alloc()
2814 return ERR_PTR(-ENOMEM); in acpi_spi_device_alloc()
2819 ACPI_COMPANION_SET(&spi->dev, adev); in acpi_spi_device_alloc()
2820 spi->max_speed_hz = lookup.max_speed_hz; in acpi_spi_device_alloc()
2821 spi->mode |= lookup.mode; in acpi_spi_device_alloc()
2822 spi->irq = lookup.irq; in acpi_spi_device_alloc()
2823 spi->bits_per_word = lookup.bits_per_word; in acpi_spi_device_alloc()
2825 * By default spi->chip_select[0] will hold the physical CS number, in acpi_spi_device_alloc()
2826 * so set bit 0 in spi->cs_index_mask. in acpi_spi_device_alloc()
2828 spi->cs_index_mask = BIT(0); in acpi_spi_device_alloc()
2839 if (acpi_bus_get_status(adev) || !adev->status.present || in acpi_register_spi_device()
2843 spi = acpi_spi_device_alloc(ctlr, adev, -1); in acpi_register_spi_device()
2845 if (PTR_ERR(spi) == -ENOMEM) in acpi_register_spi_device()
2851 acpi_set_modalias(adev, acpi_device_hid(adev), spi->modalias, in acpi_register_spi_device()
2852 sizeof(spi->modalias)); in acpi_register_spi_device()
2855 * This gets re-tried in spi_probe() for -EPROBE_DEFER handling in case in acpi_register_spi_device()
2857 * here too, because this call sets the GPIO direction and/or bias. in acpi_register_spi_device()
2863 if (spi->irq < 0) in acpi_register_spi_device()
2864 spi->irq = acpi_dev_gpio_irq_get(adev, 0); in acpi_register_spi_device()
2868 adev->power.flags.ignore_parent = true; in acpi_register_spi_device()
2870 adev->power.flags.ignore_parent = false; in acpi_register_spi_device()
2871 dev_err(&ctlr->dev, "failed to add SPI device %s from ACPI\n", in acpi_register_spi_device()
2872 dev_name(&adev->dev)); in acpi_register_spi_device()
2898 handle = ACPI_HANDLE(ctlr->dev.parent); in acpi_register_spi_devices()
2906 dev_warn(&ctlr->dev, "failed to enumerate SPI target devices\n"); in acpi_register_spi_devices()
2928 * spi_target_abort - abort the ongoing transfer request on an SPI target controller
2933 struct spi_controller *ctlr = spi->controller; in spi_target_abort()
2935 if (spi_controller_is_target(ctlr) && ctlr->target_abort) in spi_target_abort()
2936 return ctlr->target_abort(ctlr); in spi_target_abort()
2938 return -ENOTSUPP; in spi_target_abort()
2950 child = device_find_any_child(&ctlr->dev); in slave_show()
2951 ret = sysfs_emit(buf, "%s\n", child ? to_spi_device(child)->modalias : NULL); in slave_show()
2969 return -EINVAL; in slave_store()
2971 child = device_find_any_child(&ctlr->dev); in slave_store()
2982 return -ENOMEM; in slave_store()
2984 strscpy(spi->modalias, name, sizeof(spi->modalias)); in slave_store()
3023 * __spi_alloc_controller - allocate an SPI host or target controller
3025 * @size: how much zeroed driver-private data to allocate; the pointer to this
3040 * The caller is responsible for assigning the bus number and initializing the
3060 device_initialize(&ctlr->dev); in __spi_alloc_controller()
3061 INIT_LIST_HEAD(&ctlr->queue); in __spi_alloc_controller()
3062 spin_lock_init(&ctlr->queue_lock); in __spi_alloc_controller()
3063 spin_lock_init(&ctlr->bus_lock_spinlock); in __spi_alloc_controller()
3064 mutex_init(&ctlr->bus_lock_mutex); in __spi_alloc_controller()
3065 mutex_init(&ctlr->io_mutex); in __spi_alloc_controller()
3066 mutex_init(&ctlr->add_lock); in __spi_alloc_controller()
3067 ctlr->bus_num = -1; in __spi_alloc_controller()
3068 ctlr->num_chipselect = 1; in __spi_alloc_controller()
3069 ctlr->target = target; in __spi_alloc_controller()
3071 ctlr->dev.class = &spi_target_class; in __spi_alloc_controller()
3073 ctlr->dev.class = &spi_controller_class; in __spi_alloc_controller()
3074 ctlr->dev.parent = dev; in __spi_alloc_controller()
3075 pm_suspend_ignore_children(&ctlr->dev, true); in __spi_alloc_controller()
3088 * __devm_spi_alloc_controller - resource-managed __spi_alloc_controller()
3090 * @size: how much zeroed driver-private data to allocate
3115 ctlr->devm_allocated = true; in __devm_spi_alloc_controller()
3127 * spi_get_gpio_descs() - grab chip select GPIOs for the controller
3134 struct device *dev = &ctlr->dev; in spi_get_gpio_descs()
3141 if (nb == -ENOENT) in spi_get_gpio_descs()
3146 ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect); in spi_get_gpio_descs()
3148 cs = devm_kcalloc(dev, ctlr->num_chipselect, sizeof(*cs), in spi_get_gpio_descs()
3151 return -ENOMEM; in spi_get_gpio_descs()
3152 ctlr->cs_gpiods = cs; in spi_get_gpio_descs()
3177 return -ENOMEM; in spi_get_gpio_descs()
3183 if (ctlr->max_native_cs && i >= ctlr->max_native_cs) { in spi_get_gpio_descs()
3185 return -EINVAL; in spi_get_gpio_descs()
3190 ctlr->unused_native_cs = ffs(~native_cs_mask) - 1; in spi_get_gpio_descs()
3192 if ((ctlr->flags & SPI_CONTROLLER_GPIO_SS) && num_cs_gpios && in spi_get_gpio_descs()
3193 ctlr->max_native_cs && ctlr->unused_native_cs >= ctlr->max_native_cs) { in spi_get_gpio_descs()
3195 return -EINVAL; in spi_get_gpio_descs()
3204 * The controller may implement only the high-level SPI-memory like in spi_controller_check_ops()
3207 * If ->mem_ops or ->mem_ops->exec_op is NULL, we request that at least in spi_controller_check_ops()
3208 * one of the ->transfer_xxx() method be implemented. in spi_controller_check_ops()
3210 if (!ctlr->mem_ops || !ctlr->mem_ops->exec_op) { in spi_controller_check_ops()
3211 if (!ctlr->transfer && !ctlr->transfer_one && in spi_controller_check_ops()
3212 !ctlr->transfer_one_message) { in spi_controller_check_ops()
3213 return -EINVAL; in spi_controller_check_ops()
3220 /* Allocate dynamic bus number using Linux idr */
3229 return id == -ENOSPC ? -EBUSY : id; in spi_controller_id_alloc()
3230 ctlr->bus_num = id; in spi_controller_id_alloc()
3235 * spi_register_controller - register SPI host or target controller
3240 * SPI controllers connect to their drivers using some non-SPI bus,
3241 * such as the platform bus. The final stage of probe() in that code
3242 * includes calling spi_register_controller() to hook up to this SPI bus glue.
3244 * SPI controllers use board specific (often SOC specific) bus numbers,
3245 * and board-specific addressing for SPI devices combines those numbers
3259 struct device *dev = ctlr->dev.parent; in spi_register_controller()
3266 return -ENODEV; in spi_register_controller()
3276 if (ctlr->bus_num < 0) in spi_register_controller()
3277 ctlr->bus_num = of_alias_get_id(ctlr->dev.of_node, "spi"); in spi_register_controller()
3278 if (ctlr->bus_num >= 0) { in spi_register_controller()
3279 /* Devices with a fixed bus num must check-in with the num */ in spi_register_controller()
3280 status = spi_controller_id_alloc(ctlr, ctlr->bus_num, ctlr->bus_num + 1); in spi_register_controller()
3284 if (ctlr->bus_num < 0) { in spi_register_controller()
3295 ctlr->bus_lock_flag = 0; in spi_register_controller()
3296 init_completion(&ctlr->xfer_completion); in spi_register_controller()
3297 init_completion(&ctlr->cur_msg_completion); in spi_register_controller()
3298 if (!ctlr->max_dma_len) in spi_register_controller()
3299 ctlr->max_dma_len = INT_MAX; in spi_register_controller()
3303 * Registration fails if the bus ID is in use. in spi_register_controller()
3305 dev_set_name(&ctlr->dev, "spi%u", ctlr->bus_num); in spi_register_controller()
3307 if (!spi_controller_is_target(ctlr) && ctlr->use_gpio_descriptors) { in spi_register_controller()
3315 ctlr->mode_bits |= SPI_CS_HIGH; in spi_register_controller()
3319 * Even if it's just one always-selected device, there must in spi_register_controller()
3322 if (!ctlr->num_chipselect) { in spi_register_controller()
3323 status = -EINVAL; in spi_register_controller()
3329 ctlr->last_cs[idx] = SPI_INVALID_CS; in spi_register_controller()
3331 status = device_add(&ctlr->dev); in spi_register_controller()
3336 dev_name(&ctlr->dev)); in spi_register_controller()
3340 * need the queueing logic if the driver is only supporting high-level in spi_register_controller()
3343 if (ctlr->transfer) { in spi_register_controller()
3345 } else if (ctlr->transfer_one || ctlr->transfer_one_message) { in spi_register_controller()
3348 device_del(&ctlr->dev); in spi_register_controller()
3353 ctlr->pcpu_statistics = spi_alloc_pcpu_stats(dev); in spi_register_controller()
3354 if (!ctlr->pcpu_statistics) { in spi_register_controller()
3355 dev_err(dev, "Error allocating per-cpu statistics\n"); in spi_register_controller()
3356 status = -ENOMEM; in spi_register_controller()
3361 list_add_tail(&ctlr->list, &spi_controller_list); in spi_register_controller()
3363 spi_match_controller_to_boardinfo(ctlr, &bi->board_info); in spi_register_controller()
3375 idr_remove(&spi_controller_idr, ctlr->bus_num); in spi_register_controller()
3387 * devm_spi_register_controller - register managed SPI host or target controller
3406 return -ENOMEM; in devm_spi_register_controller()
3427 * spi_unregister_controller - unregister SPI host or target controller
3441 int id = ctlr->bus_num; in spi_unregister_controller()
3445 mutex_lock(&ctlr->add_lock); in spi_unregister_controller()
3447 device_for_each_child(&ctlr->dev, NULL, __unregister); in spi_unregister_controller()
3453 if (ctlr->queued) { in spi_unregister_controller()
3455 dev_err(&ctlr->dev, "queue remove failed\n"); in spi_unregister_controller()
3458 list_del(&ctlr->list); in spi_unregister_controller()
3461 device_del(&ctlr->dev); in spi_unregister_controller()
3463 /* Free bus id */ in spi_unregister_controller()
3470 mutex_unlock(&ctlr->add_lock); in spi_unregister_controller()
3476 if (!ctlr->devm_allocated) in spi_unregister_controller()
3477 put_device(&ctlr->dev); in spi_unregister_controller()
3483 return ctlr->flags & SPI_CONTROLLER_SUSPENDED ? -ESHUTDOWN : 0; in __spi_check_suspended()
3488 mutex_lock(&ctlr->bus_lock_mutex); in __spi_mark_suspended()
3489 ctlr->flags |= SPI_CONTROLLER_SUSPENDED; in __spi_mark_suspended()
3490 mutex_unlock(&ctlr->bus_lock_mutex); in __spi_mark_suspended()
3495 mutex_lock(&ctlr->bus_lock_mutex); in __spi_mark_resumed()
3496 ctlr->flags &= ~SPI_CONTROLLER_SUSPENDED; in __spi_mark_resumed()
3497 mutex_unlock(&ctlr->bus_lock_mutex); in __spi_mark_resumed()
3504 /* Basically no-ops for non-queued controllers */ in spi_controller_suspend()
3505 if (ctlr->queued) { in spi_controller_suspend()
3508 dev_err(&ctlr->dev, "queue stop failed\n"); in spi_controller_suspend()
3522 if (ctlr->queued) { in spi_controller_resume()
3525 dev_err(&ctlr->dev, "queue restart failed\n"); in spi_controller_resume()
3531 /*-------------------------------------------------------------------------*/
3543 if (rxfer->release) in __spi_replace_transfers_release()
3544 rxfer->release(ctlr, msg, res); in __spi_replace_transfers_release()
3547 list_splice(&rxfer->replaced_transfers, rxfer->replaced_after); in __spi_replace_transfers_release()
3550 for (i = 0; i < rxfer->inserted; i++) in __spi_replace_transfers_release()
3551 list_del(&rxfer->inserted_transfers[i].transfer_list); in __spi_replace_transfers_release()
3555 * spi_replace_transfers - replace transfers with several transfers
3583 rxfer = spi_res_alloc(msg->spi, __spi_replace_transfers_release, in spi_replace_transfers()
3588 return ERR_PTR(-ENOMEM); in spi_replace_transfers()
3591 rxfer->release = release; in spi_replace_transfers()
3595 rxfer->extradata = in spi_replace_transfers()
3596 &rxfer->inserted_transfers[insert]; in spi_replace_transfers()
3599 INIT_LIST_HEAD(&rxfer->replaced_transfers); in spi_replace_transfers()
3603 * the @replaced_transfers - it may be spi_message.messages! in spi_replace_transfers()
3605 rxfer->replaced_after = xfer_first->transfer_list.prev; in spi_replace_transfers()
3610 * If the entry after replaced_after it is msg->transfers in spi_replace_transfers()
3614 if (rxfer->replaced_after->next == &msg->transfers) { in spi_replace_transfers()
3615 dev_err(&msg->spi->dev, in spi_replace_transfers()
3618 list_splice(&rxfer->replaced_transfers, in spi_replace_transfers()
3619 rxfer->replaced_after); in spi_replace_transfers()
3625 return ERR_PTR(-EINVAL); in spi_replace_transfers()
3632 list_move_tail(rxfer->replaced_after->next, in spi_replace_transfers()
3633 &rxfer->replaced_transfers); in spi_replace_transfers()
3642 xfer = &rxfer->inserted_transfers[insert - 1 - i]; in spi_replace_transfers()
3648 list_add(&xfer->transfer_list, rxfer->replaced_after); in spi_replace_transfers()
3652 xfer->cs_change = false; in spi_replace_transfers()
3653 xfer->delay.value = 0; in spi_replace_transfers()
3658 rxfer->inserted = insert; in spi_replace_transfers()
3677 count = DIV_ROUND_UP(xfer->len, maxsize); in __spi_split_transfer_maxsize()
3683 xfers = srt->inserted_transfers; in __spi_split_transfer_maxsize()
3708 xfers[i].len = min(maxsize, xfers[i].len - offset); in __spi_split_transfer_maxsize()
3715 *xferp = &xfers[count - 1]; in __spi_split_transfer_maxsize()
3718 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, in __spi_split_transfer_maxsize()
3720 SPI_STATISTICS_INCREMENT_FIELD(msg->spi->pcpu_statistics, in __spi_split_transfer_maxsize()
3727 * spi_split_transfers_maxsize - split spi transfers into multiple transfers
3754 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_split_transfers_maxsize()
3755 if (xfer->len > maxsize) { in spi_split_transfers_maxsize()
3769 * spi_split_transfers_maxwords - split SPI transfers into multiple transfers
3795 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_split_transfers_maxwords()
3799 maxsize = maxwords * spi_bpw_to_bytes(xfer->bits_per_word); in spi_split_transfers_maxwords()
3800 if (xfer->len > maxsize) { in spi_split_transfers_maxwords()
3812 /*-------------------------------------------------------------------------*/
3822 if (ctlr->bits_per_word_mask) { in __spi_validate_bits_per_word()
3825 return -EINVAL; in __spi_validate_bits_per_word()
3826 if (!(ctlr->bits_per_word_mask & SPI_BPW_MASK(bits_per_word))) in __spi_validate_bits_per_word()
3827 return -EINVAL; in __spi_validate_bits_per_word()
3834 * spi_set_cs_timing - configure CS setup, hold, and inactive delays
3841 struct device *parent = spi->controller->dev.parent; in spi_set_cs_timing()
3844 if (spi->controller->set_cs_timing && !spi_get_csgpiod(spi, 0)) { in spi_set_cs_timing()
3845 if (spi->controller->auto_runtime_pm) { in spi_set_cs_timing()
3849 dev_err(&spi->controller->dev, "Failed to power device: %d\n", in spi_set_cs_timing()
3854 status = spi->controller->set_cs_timing(spi); in spi_set_cs_timing()
3857 status = spi->controller->set_cs_timing(spi); in spi_set_cs_timing()
3864 * spi_setup - setup SPI mode and clock rate
3879 * LSB-first wire encoding, or active-high chipselects.
3892 if ((hweight_long(spi->mode & in spi_setup()
3894 (hweight_long(spi->mode & in spi_setup()
3896 dev_err(&spi->dev, in spi_setup()
3897 "setup: can not select any two of dual, quad and no-rx/tx at the same time\n"); in spi_setup()
3898 return -EINVAL; in spi_setup()
3901 if ((spi->mode & SPI_3WIRE) && (spi->mode & in spi_setup()
3904 return -EINVAL; in spi_setup()
3906 if ((spi->mode & SPI_MOSI_IDLE_LOW) && (spi->mode & SPI_MOSI_IDLE_HIGH)) { in spi_setup()
3907 dev_err(&spi->dev, in spi_setup()
3909 return -EINVAL; in spi_setup()
3917 bad_bits = spi->mode & ~(spi->controller->mode_bits | SPI_CS_WORD | in spi_setup()
3923 dev_warn(&spi->dev, in spi_setup()
3926 spi->mode &= ~ugly_bits; in spi_setup()
3930 dev_err(&spi->dev, "setup: unsupported mode bits %x\n", in spi_setup()
3932 return -EINVAL; in spi_setup()
3935 if (!spi->bits_per_word) { in spi_setup()
3936 spi->bits_per_word = 8; in spi_setup()
3939 * Some controllers may not support the default 8 bits-per-word in spi_setup()
3942 status = __spi_validate_bits_per_word(spi->controller, in spi_setup()
3943 spi->bits_per_word); in spi_setup()
3948 if (spi->controller->max_speed_hz && in spi_setup()
3949 (!spi->max_speed_hz || in spi_setup()
3950 spi->max_speed_hz > spi->controller->max_speed_hz)) in spi_setup()
3951 spi->max_speed_hz = spi->controller->max_speed_hz; in spi_setup()
3953 mutex_lock(&spi->controller->io_mutex); in spi_setup()
3955 if (spi->controller->setup) { in spi_setup()
3956 status = spi->controller->setup(spi); in spi_setup()
3958 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3959 dev_err(&spi->controller->dev, "Failed to setup device: %d\n", in spi_setup()
3967 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3971 if (spi->controller->auto_runtime_pm && spi->controller->set_cs) { in spi_setup()
3972 status = pm_runtime_resume_and_get(spi->controller->dev.parent); in spi_setup()
3974 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3975 dev_err(&spi->controller->dev, "Failed to power device: %d\n", in spi_setup()
3983 * checking for a non-zero return value instead of a negative in spi_setup()
3989 pm_runtime_put_autosuspend(spi->controller->dev.parent); in spi_setup()
3994 mutex_unlock(&spi->controller->io_mutex); in spi_setup()
3996 if (spi->rt && !spi->controller->rt) { in spi_setup()
3997 spi->controller->rt = true; in spi_setup()
3998 spi_set_thread_rt(spi->controller); in spi_setup()
4003 dev_dbg(&spi->dev, "setup mode %lu, %s%s%s%s%u bits/w, %u Hz max --> %d\n", in spi_setup()
4004 spi->mode & SPI_MODE_X_MASK, in spi_setup()
4005 (spi->mode & SPI_CS_HIGH) ? "cs_high, " : "", in spi_setup()
4006 (spi->mode & SPI_LSB_FIRST) ? "lsb, " : "", in spi_setup()
4007 (spi->mode & SPI_3WIRE) ? "3wire, " : "", in spi_setup()
4008 (spi->mode & SPI_LOOP) ? "loopback, " : "", in spi_setup()
4009 spi->bits_per_word, spi->max_speed_hz, in spi_setup()
4021 delay1 = spi_delay_to_ns(&xfer->word_delay, xfer); in _spi_xfer_word_delay_update()
4025 delay2 = spi_delay_to_ns(&spi->word_delay, xfer); in _spi_xfer_word_delay_update()
4030 memcpy(&xfer->word_delay, &spi->word_delay, in _spi_xfer_word_delay_update()
4031 sizeof(xfer->word_delay)); in _spi_xfer_word_delay_update()
4038 struct spi_controller *ctlr = spi->controller; in __spi_validate()
4042 if (list_empty(&message->transfers)) in __spi_validate()
4043 return -EINVAL; in __spi_validate()
4045 message->spi = spi; in __spi_validate()
4048 * Half-duplex links include original MicroWire, and ones with in __spi_validate()
4053 if ((ctlr->flags & SPI_CONTROLLER_HALF_DUPLEX) || in __spi_validate()
4054 (spi->mode & SPI_3WIRE)) { in __spi_validate()
4055 unsigned flags = ctlr->flags; in __spi_validate()
4057 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_validate()
4058 if (xfer->rx_buf && xfer->tx_buf) in __spi_validate()
4059 return -EINVAL; in __spi_validate()
4060 if ((flags & SPI_CONTROLLER_NO_TX) && xfer->tx_buf) in __spi_validate()
4061 return -EINVAL; in __spi_validate()
4062 if ((flags & SPI_CONTROLLER_NO_RX) && xfer->rx_buf) in __spi_validate()
4063 return -EINVAL; in __spi_validate()
4075 message->frame_length = 0; in __spi_validate()
4076 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_validate()
4077 xfer->effective_speed_hz = 0; in __spi_validate()
4078 message->frame_length += xfer->len; in __spi_validate()
4079 if (!xfer->bits_per_word) in __spi_validate()
4080 xfer->bits_per_word = spi->bits_per_word; in __spi_validate()
4082 if (!xfer->speed_hz) in __spi_validate()
4083 xfer->speed_hz = spi->max_speed_hz; in __spi_validate()
4085 if (ctlr->max_speed_hz && xfer->speed_hz > ctlr->max_speed_hz) in __spi_validate()
4086 xfer->speed_hz = ctlr->max_speed_hz; in __spi_validate()
4088 if (__spi_validate_bits_per_word(ctlr, xfer->bits_per_word)) in __spi_validate()
4089 return -EINVAL; in __spi_validate()
4095 if (xfer->dtr_mode && !ctlr->dtr_caps) in __spi_validate()
4096 return -EINVAL; in __spi_validate()
4100 * where SPI word size should be power-of-two multiple. in __spi_validate()
4102 if (xfer->bits_per_word <= 8) in __spi_validate()
4104 else if (xfer->bits_per_word <= 16) in __spi_validate()
4110 if (xfer->len % w_size) in __spi_validate()
4111 return -EINVAL; in __spi_validate()
4113 if (xfer->speed_hz && ctlr->min_speed_hz && in __spi_validate()
4114 xfer->speed_hz < ctlr->min_speed_hz) in __spi_validate()
4115 return -EINVAL; in __spi_validate()
4117 if (xfer->tx_buf && !xfer->tx_nbits) in __spi_validate()
4118 xfer->tx_nbits = SPI_NBITS_SINGLE; in __spi_validate()
4119 if (xfer->rx_buf && !xfer->rx_nbits) in __spi_validate()
4120 xfer->rx_nbits = SPI_NBITS_SINGLE; in __spi_validate()
4126 if (xfer->tx_buf) { in __spi_validate()
4127 if (spi->mode & SPI_NO_TX) in __spi_validate()
4128 return -EINVAL; in __spi_validate()
4129 if (xfer->tx_nbits != SPI_NBITS_SINGLE && in __spi_validate()
4130 xfer->tx_nbits != SPI_NBITS_DUAL && in __spi_validate()
4131 xfer->tx_nbits != SPI_NBITS_QUAD && in __spi_validate()
4132 xfer->tx_nbits != SPI_NBITS_OCTAL) in __spi_validate()
4133 return -EINVAL; in __spi_validate()
4134 if ((xfer->tx_nbits == SPI_NBITS_DUAL) && in __spi_validate()
4135 !(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD | SPI_TX_OCTAL))) in __spi_validate()
4136 return -EINVAL; in __spi_validate()
4137 if ((xfer->tx_nbits == SPI_NBITS_QUAD) && in __spi_validate()
4138 !(spi->mode & (SPI_TX_QUAD | SPI_TX_OCTAL))) in __spi_validate()
4139 return -EINVAL; in __spi_validate()
4140 if ((xfer->tx_nbits == SPI_NBITS_OCTAL) && in __spi_validate()
4141 !(spi->mode & SPI_TX_OCTAL)) in __spi_validate()
4142 return -EINVAL; in __spi_validate()
4145 if (xfer->rx_buf) { in __spi_validate()
4146 if (spi->mode & SPI_NO_RX) in __spi_validate()
4147 return -EINVAL; in __spi_validate()
4148 if (xfer->rx_nbits != SPI_NBITS_SINGLE && in __spi_validate()
4149 xfer->rx_nbits != SPI_NBITS_DUAL && in __spi_validate()
4150 xfer->rx_nbits != SPI_NBITS_QUAD && in __spi_validate()
4151 xfer->rx_nbits != SPI_NBITS_OCTAL) in __spi_validate()
4152 return -EINVAL; in __spi_validate()
4153 if ((xfer->rx_nbits == SPI_NBITS_DUAL) && in __spi_validate()
4154 !(spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD | SPI_RX_OCTAL))) in __spi_validate()
4155 return -EINVAL; in __spi_validate()
4156 if ((xfer->rx_nbits == SPI_NBITS_QUAD) && in __spi_validate()
4157 !(spi->mode & (SPI_RX_QUAD | SPI_RX_OCTAL))) in __spi_validate()
4158 return -EINVAL; in __spi_validate()
4159 if ((xfer->rx_nbits == SPI_NBITS_OCTAL) && in __spi_validate()
4160 !(spi->mode & SPI_RX_OCTAL)) in __spi_validate()
4161 return -EINVAL; in __spi_validate()
4165 return -EINVAL; in __spi_validate()
4168 if (xfer->offload_flags) { in __spi_validate()
4169 if (!message->offload) in __spi_validate()
4170 return -EINVAL; in __spi_validate()
4172 if (xfer->offload_flags & ~message->offload->xfer_flags) in __spi_validate()
4173 return -EINVAL; in __spi_validate()
4177 message->status = -EINPROGRESS; in __spi_validate()
4183 * spi_split_transfers - generic handling of transfer splitting
4199 struct spi_controller *ctlr = msg->spi->controller; in spi_split_transfers()
4206 * for the CS line, we can emulate the CS-per-word hardware function by in spi_split_transfers()
4207 * splitting transfers into one-word transfers and ensuring that in spi_split_transfers()
4210 if ((msg->spi->mode & SPI_CS_WORD) && in spi_split_transfers()
4211 (!(ctlr->mode_bits & SPI_CS_WORD) || spi_is_csgpiod(msg->spi))) { in spi_split_transfers()
4216 list_for_each_entry(xfer, &msg->transfers, transfer_list) { in spi_split_transfers()
4218 if (list_is_last(&xfer->transfer_list, &msg->transfers)) in spi_split_transfers()
4221 xfer->cs_change = 1; in spi_split_transfers()
4225 spi_max_transfer_size(msg->spi)); in spi_split_transfers()
4234 * __spi_optimize_message - shared implementation for spi_optimize_message()
4249 struct spi_controller *ctlr = spi->controller; in __spi_optimize_message()
4260 if (ctlr->optimize_message) { in __spi_optimize_message()
4261 ret = ctlr->optimize_message(msg); in __spi_optimize_message()
4268 msg->optimized = true; in __spi_optimize_message()
4274 * spi_maybe_optimize_message - optimize message if it isn't already pre-optimized
4282 if (spi->controller->defer_optimize_message) { in spi_maybe_optimize_message()
4283 msg->spi = spi; in spi_maybe_optimize_message()
4287 if (msg->pre_optimized) in spi_maybe_optimize_message()
4294 * spi_optimize_message - do any one-time validation and setup for a SPI message
4304 * of updating the contents of any xfer->tx_buf (the pointer can't be changed,
4318 * Pre-optimization is not supported and optimization is deferred e.g. in spi_optimize_message()
4319 * when using spi-mux. in spi_optimize_message()
4321 if (spi->controller->defer_optimize_message) in spi_optimize_message()
4334 msg->pre_optimized = true; in spi_optimize_message()
4341 * spi_unoptimize_message - releases any resources allocated by spi_optimize_message()
4350 if (msg->spi->controller->defer_optimize_message) in spi_unoptimize_message()
4354 msg->pre_optimized = false; in spi_unoptimize_message()
4360 struct spi_controller *ctlr = spi->controller; in __spi_async()
4367 if (!ctlr->transfer) in __spi_async()
4368 return -ENOTSUPP; in __spi_async()
4370 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_async); in __spi_async()
4371 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_async); in __spi_async()
4375 if (!ctlr->ptp_sts_supported) { in __spi_async()
4376 list_for_each_entry(xfer, &message->transfers, transfer_list) { in __spi_async()
4377 xfer->ptp_sts_word_pre = 0; in __spi_async()
4378 ptp_read_system_prets(xfer->ptp_sts); in __spi_async()
4382 return ctlr->transfer(spi, message); in __spi_async()
4391 * devm_spi_optimize_message - managed version of spi_optimize_message()
4392 * @dev: the device that manages @msg (usually @spi->dev)
4414 * spi_async - asynchronous SPI transfer
4423 * Before that invocation, the value of message->status is undefined.
4424 * When the callback is issued, message->status holds either zero (to
4446 struct spi_controller *ctlr = spi->controller; in spi_async()
4454 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in spi_async()
4456 if (ctlr->bus_lock_flag) in spi_async()
4457 ret = -EBUSY; in spi_async()
4461 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in spi_async()
4472 mutex_lock(&ctlr->io_mutex); in __spi_transfer_message_noqueue()
4474 was_busy = ctlr->busy; in __spi_transfer_message_noqueue()
4476 ctlr->cur_msg = msg; in __spi_transfer_message_noqueue()
4479 dev_err(&ctlr->dev, "noqueue transfer failed\n"); in __spi_transfer_message_noqueue()
4480 ctlr->cur_msg = NULL; in __spi_transfer_message_noqueue()
4481 ctlr->fallback = false; in __spi_transfer_message_noqueue()
4484 kfree(ctlr->dummy_rx); in __spi_transfer_message_noqueue()
4485 ctlr->dummy_rx = NULL; in __spi_transfer_message_noqueue()
4486 kfree(ctlr->dummy_tx); in __spi_transfer_message_noqueue()
4487 ctlr->dummy_tx = NULL; in __spi_transfer_message_noqueue()
4488 if (ctlr->unprepare_transfer_hardware && in __spi_transfer_message_noqueue()
4489 ctlr->unprepare_transfer_hardware(ctlr)) in __spi_transfer_message_noqueue()
4490 dev_err(&ctlr->dev, in __spi_transfer_message_noqueue()
4495 mutex_unlock(&ctlr->io_mutex); in __spi_transfer_message_noqueue()
4498 /*-------------------------------------------------------------------------*/
4516 struct spi_controller *ctlr = spi->controller; in __spi_sync()
4519 dev_warn_once(&spi->dev, "Attempted to sync while suspend\n"); in __spi_sync()
4520 return -ESHUTDOWN; in __spi_sync()
4527 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_sync); in __spi_sync()
4528 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_sync); in __spi_sync()
4536 if (READ_ONCE(ctlr->queue_empty) && !ctlr->must_async) { in __spi_sync()
4537 message->actual_length = 0; in __spi_sync()
4538 message->status = -EINPROGRESS; in __spi_sync()
4542 SPI_STATISTICS_INCREMENT_FIELD(ctlr->pcpu_statistics, spi_sync_immediate); in __spi_sync()
4543 SPI_STATISTICS_INCREMENT_FIELD(spi->pcpu_statistics, spi_sync_immediate); in __spi_sync()
4547 return message->status; in __spi_sync()
4556 message->complete = spi_complete; in __spi_sync()
4557 message->context = &done; in __spi_sync()
4559 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in __spi_sync()
4561 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in __spi_sync()
4565 status = message->status; in __spi_sync()
4567 message->complete = NULL; in __spi_sync()
4568 message->context = NULL; in __spi_sync()
4574 * spi_sync - blocking/synchronous SPI data transfers
4580 * is non-interruptible, and has no timeout. Low-overhead controller
4585 * frequently-used devices may want to minimize costs of selecting a chip,
4598 mutex_lock(&spi->controller->bus_lock_mutex); in spi_sync()
4600 mutex_unlock(&spi->controller->bus_lock_mutex); in spi_sync()
4607 * spi_sync_locked - version of spi_sync with exclusive bus usage
4613 * is non-interruptible, and has no timeout. Low-overhead controller
4617 * SPI bus. It has to be preceded by a spi_bus_lock call. The SPI bus must
4629 * spi_bus_lock - obtain a lock for exclusive SPI bus usage
4630 * @ctlr: SPI bus controller that should be locked for exclusive bus access
4634 * is non-interruptible, and has no timeout.
4637 * SPI bus. The SPI bus must be released by a spi_bus_unlock call when the
4639 * and spi_async_locked calls when the SPI bus lock is held.
4647 mutex_lock(&ctlr->bus_lock_mutex); in spi_bus_lock()
4649 spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); in spi_bus_lock()
4650 ctlr->bus_lock_flag = 1; in spi_bus_lock()
4651 spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); in spi_bus_lock()
4660 * spi_bus_unlock - release the lock for exclusive SPI bus usage
4661 * @ctlr: SPI bus controller that was locked for exclusive bus access
4665 * is non-interruptible, and has no timeout.
4667 * This call releases an SPI bus lock previously obtained by an spi_bus_lock
4674 ctlr->bus_lock_flag = 0; in spi_bus_unlock()
4676 mutex_unlock(&ctlr->bus_lock_mutex); in spi_bus_unlock()
4688 * spi_write_then_read - SPI synchronous write followed by read
4690 * @txbuf: data to be written (need not be DMA-safe)
4692 * @rxbuf: buffer into which data will be read (need not be DMA-safe)
4702 * Performance-sensitive or bulk transfer code should instead use
4703 * spi_{async,sync}() calls with DMA-safe buffers.
4719 * Use preallocated DMA-safe buffer if we can. We can't avoid in spi_write_then_read()
4722 * using the pre-allocated buffer or the transfer is too large. in spi_write_then_read()
4728 return -ENOMEM; in spi_write_then_read()
4762 /*-------------------------------------------------------------------------*/
4797 ctlr = of_find_spi_controller_by_node(rd->dn->parent); in of_spi_notify()
4801 if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) { in of_spi_notify()
4802 put_device(&ctlr->dev); in of_spi_notify()
4810 rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE; in of_spi_notify()
4811 spi = of_register_spi_device(ctlr, rd->dn); in of_spi_notify()
4812 put_device(&ctlr->dev); in of_spi_notify()
4816 __func__, rd->dn); in of_spi_notify()
4817 of_node_clear_flag(rd->dn, OF_POPULATED); in of_spi_notify()
4824 if (!of_node_check_flag(rd->dn, OF_POPULATED)) in of_spi_notify()
4828 spi = of_find_spi_device_by_node(rd->dn); in of_spi_notify()
4836 put_device(&spi->dev); in of_spi_notify()
4853 return device_match_acpi_dev(dev->parent, data); in spi_acpi_controller_match()
4894 put_device(&ctlr->dev); in acpi_spi_notify()
4905 put_device(&spi->dev); in acpi_spi_notify()
4925 status = -ENOMEM; in spi_init()