Lines Matching +full:spi +full:- +full:slave
1 // SPDX-License-Identifier: GPL-2.0+
14 #include <spi.h>
15 #include <spi-mem.h>
20 * spi_controller_dma_map_mem_op_data() - DMA-map the buffer attached to a
22 * @ctlr: the SPI controller requesting this dma_map()
24 * @sgt: a pointer to a non-initialized sg_table that will be filled by this
28 * This helper prepares everything for you and provides a ready-to-use
29 * sg_table. This function is not intended to be called from spi drivers.
30 * Only SPI controller drivers should use it.
32 * op->data.buf.{in,out} is DMA-able before calling this function.
42 if (!op->data.nbytes) in spi_controller_dma_map_mem_op_data()
43 return -EINVAL; in spi_controller_dma_map_mem_op_data()
45 if (op->data.dir == SPI_MEM_DATA_OUT && ctlr->dma_tx) in spi_controller_dma_map_mem_op_data()
46 dmadev = ctlr->dma_tx->device->dev; in spi_controller_dma_map_mem_op_data()
47 else if (op->data.dir == SPI_MEM_DATA_IN && ctlr->dma_rx) in spi_controller_dma_map_mem_op_data()
48 dmadev = ctlr->dma_rx->device->dev; in spi_controller_dma_map_mem_op_data()
50 dmadev = ctlr->dev.parent; in spi_controller_dma_map_mem_op_data()
53 return -EINVAL; in spi_controller_dma_map_mem_op_data()
55 return spi_map_buf(ctlr, dmadev, sgt, op->data.buf.in, op->data.nbytes, in spi_controller_dma_map_mem_op_data()
56 op->data.dir == SPI_MEM_DATA_IN ? in spi_controller_dma_map_mem_op_data()
62 * spi_controller_dma_unmap_mem_op_data() - DMA-unmap the buffer attached to a
64 * @ctlr: the SPI controller requesting this dma_unmap()
71 * op->data.buf.{in,out} buffer again.
73 * This function is not intended to be called from SPI drivers. Only SPI
88 if (!op->data.nbytes) in spi_controller_dma_unmap_mem_op_data()
91 if (op->data.dir == SPI_MEM_DATA_OUT && ctlr->dma_tx) in spi_controller_dma_unmap_mem_op_data()
92 dmadev = ctlr->dma_tx->device->dev; in spi_controller_dma_unmap_mem_op_data()
93 else if (op->data.dir == SPI_MEM_DATA_IN && ctlr->dma_rx) in spi_controller_dma_unmap_mem_op_data()
94 dmadev = ctlr->dma_rx->device->dev; in spi_controller_dma_unmap_mem_op_data()
96 dmadev = ctlr->dev.parent; in spi_controller_dma_unmap_mem_op_data()
99 op->data.dir == SPI_MEM_DATA_IN ? in spi_controller_dma_unmap_mem_op_data()
105 static int spi_check_buswidth_req(struct spi_slave *slave, u8 buswidth, bool tx) in spi_check_buswidth_req() argument
107 u32 mode = slave->mode; in spi_check_buswidth_req()
137 return -ENOTSUPP; in spi_check_buswidth_req()
140 bool spi_mem_default_supports_op(struct spi_slave *slave, in spi_mem_default_supports_op() argument
143 if (spi_check_buswidth_req(slave, op->cmd.buswidth, true)) in spi_mem_default_supports_op()
146 if (op->addr.nbytes && in spi_mem_default_supports_op()
147 spi_check_buswidth_req(slave, op->addr.buswidth, true)) in spi_mem_default_supports_op()
150 if (op->dummy.nbytes && in spi_mem_default_supports_op()
151 spi_check_buswidth_req(slave, op->dummy.buswidth, true)) in spi_mem_default_supports_op()
154 if (op->data.nbytes && in spi_mem_default_supports_op()
155 spi_check_buswidth_req(slave, op->data.buswidth, in spi_mem_default_supports_op()
156 op->data.dir == SPI_MEM_DATA_OUT)) in spi_mem_default_supports_op()
164 * spi_mem_supports_op() - Check if a memory device and the controller it is
166 * @slave: the SPI device
178 bool spi_mem_supports_op(struct spi_slave *slave, in spi_mem_supports_op() argument
181 struct udevice *bus = slave->dev->parent; in spi_mem_supports_op()
184 if (ops->mem_ops && ops->mem_ops->supports_op) in spi_mem_supports_op()
185 return ops->mem_ops->supports_op(slave, op); in spi_mem_supports_op()
187 return spi_mem_default_supports_op(slave, op); in spi_mem_supports_op()
192 * spi_mem_exec_op() - Execute a memory operation
193 * @slave: the SPI device
203 int spi_mem_exec_op(struct spi_slave *slave, const struct spi_mem_op *op) in spi_mem_exec_op() argument
205 struct udevice *bus = slave->dev->parent; in spi_mem_exec_op()
215 if (!spi_mem_supports_op(slave, op)) in spi_mem_exec_op()
216 return -ENOTSUPP; in spi_mem_exec_op()
218 ret = spi_claim_bus(slave); in spi_mem_exec_op()
222 if (ops->mem_ops && ops->mem_ops->exec_op) { in spi_mem_exec_op()
225 * Flush the message queue before executing our SPI memory in spi_mem_exec_op()
226 * operation to prevent preemption of regular SPI transfers. in spi_mem_exec_op()
230 if (ctlr->auto_runtime_pm) { in spi_mem_exec_op()
231 ret = pm_runtime_get_sync(ctlr->dev.parent); in spi_mem_exec_op()
233 dev_err(&ctlr->dev, in spi_mem_exec_op()
240 mutex_lock(&ctlr->bus_lock_mutex); in spi_mem_exec_op()
241 mutex_lock(&ctlr->io_mutex); in spi_mem_exec_op()
243 ret = ops->mem_ops->exec_op(slave, op); in spi_mem_exec_op()
246 mutex_unlock(&ctlr->io_mutex); in spi_mem_exec_op()
247 mutex_unlock(&ctlr->bus_lock_mutex); in spi_mem_exec_op()
249 if (ctlr->auto_runtime_pm) in spi_mem_exec_op()
250 pm_runtime_put(ctlr->dev.parent); in spi_mem_exec_op()
255 * read path) and expect the core to use the regular SPI in spi_mem_exec_op()
258 if (!ret || ret != -ENOTSUPP) { in spi_mem_exec_op()
259 spi_release_bus(slave); in spi_mem_exec_op()
265 tmpbufsize = sizeof(op->cmd.opcode) + op->addr.nbytes + in spi_mem_exec_op()
266 op->dummy.nbytes; in spi_mem_exec_op()
270 * we're guaranteed that this buffer is DMA-able, as required by the in spi_mem_exec_op()
271 * SPI layer. in spi_mem_exec_op()
275 return -ENOMEM; in spi_mem_exec_op()
279 tmpbuf[0] = op->cmd.opcode; in spi_mem_exec_op()
281 xfers[xferpos].len = sizeof(op->cmd.opcode); in spi_mem_exec_op()
282 xfers[xferpos].tx_nbits = op->cmd.buswidth; in spi_mem_exec_op()
287 if (op->addr.nbytes) { in spi_mem_exec_op()
290 for (i = 0; i < op->addr.nbytes; i++) in spi_mem_exec_op()
291 tmpbuf[i + 1] = op->addr.val >> in spi_mem_exec_op()
292 (8 * (op->addr.nbytes - i - 1)); in spi_mem_exec_op()
295 xfers[xferpos].len = op->addr.nbytes; in spi_mem_exec_op()
296 xfers[xferpos].tx_nbits = op->addr.buswidth; in spi_mem_exec_op()
299 totalxferlen += op->addr.nbytes; in spi_mem_exec_op()
302 if (op->dummy.nbytes) { in spi_mem_exec_op()
303 memset(tmpbuf + op->addr.nbytes + 1, 0xff, op->dummy.nbytes); in spi_mem_exec_op()
304 xfers[xferpos].tx_buf = tmpbuf + op->addr.nbytes + 1; in spi_mem_exec_op()
305 xfers[xferpos].len = op->dummy.nbytes; in spi_mem_exec_op()
306 xfers[xferpos].tx_nbits = op->dummy.buswidth; in spi_mem_exec_op()
309 totalxferlen += op->dummy.nbytes; in spi_mem_exec_op()
312 if (op->data.nbytes) { in spi_mem_exec_op()
313 if (op->data.dir == SPI_MEM_DATA_IN) { in spi_mem_exec_op()
314 xfers[xferpos].rx_buf = op->data.buf.in; in spi_mem_exec_op()
315 xfers[xferpos].rx_nbits = op->data.buswidth; in spi_mem_exec_op()
317 xfers[xferpos].tx_buf = op->data.buf.out; in spi_mem_exec_op()
318 xfers[xferpos].tx_nbits = op->data.buswidth; in spi_mem_exec_op()
321 xfers[xferpos].len = op->data.nbytes; in spi_mem_exec_op()
324 totalxferlen += op->data.nbytes; in spi_mem_exec_op()
327 ret = spi_sync(slave, &msg); in spi_mem_exec_op()
335 return -EIO; in spi_mem_exec_op()
338 if (op->data.nbytes) { in spi_mem_exec_op()
339 if (op->data.dir == SPI_MEM_DATA_IN) in spi_mem_exec_op()
340 rx_buf = op->data.buf.in; in spi_mem_exec_op()
342 tx_buf = op->data.buf.out; in spi_mem_exec_op()
345 op_len = sizeof(op->cmd.opcode) + op->addr.nbytes + op->dummy.nbytes; in spi_mem_exec_op()
353 * data being sent, only the op-code and address. In fact, it should be in spi_mem_exec_op()
358 op_buf[pos++] = op->cmd.opcode; in spi_mem_exec_op()
360 if (op->addr.nbytes) { in spi_mem_exec_op()
361 for (i = 0; i < op->addr.nbytes; i++) in spi_mem_exec_op()
362 op_buf[pos + i] = op->addr.val >> in spi_mem_exec_op()
363 (8 * (op->addr.nbytes - i - 1)); in spi_mem_exec_op()
365 pos += op->addr.nbytes; in spi_mem_exec_op()
368 if (op->dummy.nbytes) in spi_mem_exec_op()
369 memset(op_buf + pos, 0xff, op->dummy.nbytes); in spi_mem_exec_op()
377 ret = spi_xfer(slave, op_len * 8, op_buf, NULL, flag); in spi_mem_exec_op()
384 if (slave->mode & SPI_DMA_PREPARE) in spi_mem_exec_op()
387 ret = spi_xfer(slave, op->data.nbytes * 8, tx_buf, in spi_mem_exec_op()
393 spi_release_bus(slave); in spi_mem_exec_op()
398 tx_buf || rx_buf ? op->data.nbytes : 0, in spi_mem_exec_op()
399 tx_buf || rx_buf ? (tx_buf ? "out" : "in") : "-"); in spi_mem_exec_op()
400 for (i = 0; i < op->data.nbytes; i++) in spi_mem_exec_op()
413 * spi_mem_adjust_op_size() - Adjust the data size of a SPI mem operation to
415 * @slave: the SPI device
420 * optimized accesses. This function allows SPI mem drivers to split a single
421 * operation into multiple sub-operations when required.
424 * 0 otherwise. Note that @op->data.nbytes will be updated if @op
427 int spi_mem_adjust_op_size(struct spi_slave *slave, struct spi_mem_op *op) in spi_mem_adjust_op_size() argument
429 struct udevice *bus = slave->dev->parent; in spi_mem_adjust_op_size()
432 if (ops->mem_ops && ops->mem_ops->adjust_op_size) in spi_mem_adjust_op_size()
433 return ops->mem_ops->adjust_op_size(slave, op); in spi_mem_adjust_op_size()
435 if (!ops->mem_ops || !ops->mem_ops->exec_op) { in spi_mem_adjust_op_size()
438 len = sizeof(op->cmd.opcode) + op->addr.nbytes + in spi_mem_adjust_op_size()
439 op->dummy.nbytes; in spi_mem_adjust_op_size()
440 if (slave->max_write_size && len > slave->max_write_size) in spi_mem_adjust_op_size()
441 return -EINVAL; in spi_mem_adjust_op_size()
443 if (op->data.dir == SPI_MEM_DATA_IN && slave->max_read_size) in spi_mem_adjust_op_size()
444 op->data.nbytes = min(op->data.nbytes, in spi_mem_adjust_op_size()
445 slave->max_read_size); in spi_mem_adjust_op_size()
446 else if (slave->max_write_size) in spi_mem_adjust_op_size()
447 op->data.nbytes = min(op->data.nbytes, in spi_mem_adjust_op_size()
448 slave->max_write_size - len); in spi_mem_adjust_op_size()
450 if (!op->data.nbytes) in spi_mem_adjust_op_size()
451 return -EINVAL; in spi_mem_adjust_op_size()
464 static int spi_mem_probe(struct spi_device *spi) in spi_mem_probe() argument
466 struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver); in spi_mem_probe()
469 mem = devm_kzalloc(&spi->dev, sizeof(*mem), GFP_KERNEL); in spi_mem_probe()
471 return -ENOMEM; in spi_mem_probe()
473 mem->spi = spi; in spi_mem_probe()
474 spi_set_drvdata(spi, mem); in spi_mem_probe()
476 return memdrv->probe(mem); in spi_mem_probe()
479 static int spi_mem_remove(struct spi_device *spi) in spi_mem_remove() argument
481 struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver); in spi_mem_remove()
482 struct spi_mem *mem = spi_get_drvdata(spi); in spi_mem_remove()
484 if (memdrv->remove) in spi_mem_remove()
485 return memdrv->remove(mem); in spi_mem_remove()
490 static void spi_mem_shutdown(struct spi_device *spi) in spi_mem_shutdown() argument
492 struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver); in spi_mem_shutdown()
493 struct spi_mem *mem = spi_get_drvdata(spi); in spi_mem_shutdown()
495 if (memdrv->shutdown) in spi_mem_shutdown()
496 memdrv->shutdown(mem); in spi_mem_shutdown()
500 * spi_mem_driver_register_with_owner() - Register a SPI memory driver
501 * @memdrv: the SPI memory driver to register
504 * Registers a SPI memory driver.
512 memdrv->spidrv.probe = spi_mem_probe; in spi_mem_driver_register_with_owner()
513 memdrv->spidrv.remove = spi_mem_remove; in spi_mem_driver_register_with_owner()
514 memdrv->spidrv.shutdown = spi_mem_shutdown; in spi_mem_driver_register_with_owner()
516 return __spi_register_driver(owner, &memdrv->spidrv); in spi_mem_driver_register_with_owner()
521 * spi_mem_driver_unregister_with_owner() - Unregister a SPI memory driver
522 * @memdrv: the SPI memory driver to unregister
524 * Unregisters a SPI memory driver.
528 spi_unregister_driver(&memdrv->spidrv); in spi_mem_driver_unregister()