Lines Matching +full:dma +full:- +full:mem
1 // SPDX-License-Identifier: GPL-2.0+
11 #include <linux/spi/spi-mem.h>
18 * spi_controller_dma_map_mem_op_data() - DMA-map the buffer attached to a
22 * @sgt: a pointer to a non-initialized sg_table that will be filled by this
25 * Some controllers might want to do DMA on the data buffer embedded in @op.
26 * This helper prepares everything for you and provides a ready-to-use
30 * op->data.buf.{in,out} is DMA-able before calling this function.
40 if (!op->data.nbytes) in spi_controller_dma_map_mem_op_data()
41 return -EINVAL; in spi_controller_dma_map_mem_op_data()
43 if (op->data.dir == SPI_MEM_DATA_OUT && ctlr->dma_tx) in spi_controller_dma_map_mem_op_data()
44 dmadev = ctlr->dma_tx->device->dev; in spi_controller_dma_map_mem_op_data()
45 else if (op->data.dir == SPI_MEM_DATA_IN && ctlr->dma_rx) in spi_controller_dma_map_mem_op_data()
46 dmadev = ctlr->dma_rx->device->dev; in spi_controller_dma_map_mem_op_data()
48 dmadev = ctlr->dev.parent; in spi_controller_dma_map_mem_op_data()
51 return -EINVAL; in spi_controller_dma_map_mem_op_data()
53 return spi_map_buf(ctlr, dmadev, sgt, op->data.buf.in, op->data.nbytes, in spi_controller_dma_map_mem_op_data()
54 op->data.dir == SPI_MEM_DATA_IN ? in spi_controller_dma_map_mem_op_data()
60 * spi_controller_dma_unmap_mem_op_data() - DMA-unmap the buffer attached to a
67 * Some controllers might want to do DMA on the data buffer embedded in @op.
69 * op->data.buf.{in,out} buffer again.
74 * This function should be called after the DMA operation has finished and is
86 if (!op->data.nbytes) in spi_controller_dma_unmap_mem_op_data()
89 if (op->data.dir == SPI_MEM_DATA_OUT && ctlr->dma_tx) in spi_controller_dma_unmap_mem_op_data()
90 dmadev = ctlr->dma_tx->device->dev; in spi_controller_dma_unmap_mem_op_data()
91 else if (op->data.dir == SPI_MEM_DATA_IN && ctlr->dma_rx) in spi_controller_dma_unmap_mem_op_data()
92 dmadev = ctlr->dma_rx->device->dev; in spi_controller_dma_unmap_mem_op_data()
94 dmadev = ctlr->dev.parent; in spi_controller_dma_unmap_mem_op_data()
97 op->data.dir == SPI_MEM_DATA_IN ? in spi_controller_dma_unmap_mem_op_data()
102 static int spi_check_buswidth_req(struct spi_mem *mem, u8 buswidth, bool tx) in spi_check_buswidth_req() argument
104 u32 mode = mem->spi->mode; in spi_check_buswidth_req()
128 return -ENOTSUPP; in spi_check_buswidth_req()
131 static bool spi_mem_default_supports_op(struct spi_mem *mem, in spi_mem_default_supports_op() argument
134 if (spi_check_buswidth_req(mem, op->cmd.buswidth, true)) in spi_mem_default_supports_op()
137 if (op->addr.nbytes && in spi_mem_default_supports_op()
138 spi_check_buswidth_req(mem, op->addr.buswidth, true)) in spi_mem_default_supports_op()
141 if (op->dummy.nbytes && in spi_mem_default_supports_op()
142 spi_check_buswidth_req(mem, op->dummy.buswidth, true)) in spi_mem_default_supports_op()
145 if (op->data.nbytes && in spi_mem_default_supports_op()
146 spi_check_buswidth_req(mem, op->data.buswidth, in spi_mem_default_supports_op()
147 op->data.dir == SPI_MEM_DATA_OUT)) in spi_mem_default_supports_op()
164 if (!op->cmd.buswidth) in spi_mem_check_op()
165 return -EINVAL; in spi_mem_check_op()
167 if ((op->addr.nbytes && !op->addr.buswidth) || in spi_mem_check_op()
168 (op->dummy.nbytes && !op->dummy.buswidth) || in spi_mem_check_op()
169 (op->data.nbytes && !op->data.buswidth)) in spi_mem_check_op()
170 return -EINVAL; in spi_mem_check_op()
172 if (!spi_mem_buswidth_is_valid(op->cmd.buswidth) || in spi_mem_check_op()
173 !spi_mem_buswidth_is_valid(op->addr.buswidth) || in spi_mem_check_op()
174 !spi_mem_buswidth_is_valid(op->dummy.buswidth) || in spi_mem_check_op()
175 !spi_mem_buswidth_is_valid(op->data.buswidth)) in spi_mem_check_op()
176 return -EINVAL; in spi_mem_check_op()
181 static bool spi_mem_internal_supports_op(struct spi_mem *mem, in spi_mem_internal_supports_op() argument
184 struct spi_controller *ctlr = mem->spi->controller; in spi_mem_internal_supports_op()
186 if (ctlr->mem_ops && ctlr->mem_ops->supports_op) in spi_mem_internal_supports_op()
187 return ctlr->mem_ops->supports_op(mem, op); in spi_mem_internal_supports_op()
189 return spi_mem_default_supports_op(mem, op); in spi_mem_internal_supports_op()
193 * spi_mem_supports_op() - Check if a memory device and the controller it is
195 * @mem: the SPI memory
207 bool spi_mem_supports_op(struct spi_mem *mem, const struct spi_mem_op *op) in spi_mem_supports_op() argument
212 return spi_mem_internal_supports_op(mem, op); in spi_mem_supports_op()
217 * spi_mem_exec_op() - Execute a memory operation
218 * @mem: the SPI memory
228 int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) in spi_mem_exec_op() argument
231 struct spi_controller *ctlr = mem->spi->controller; in spi_mem_exec_op()
241 if (!spi_mem_internal_supports_op(mem, op)) in spi_mem_exec_op()
242 return -ENOTSUPP; in spi_mem_exec_op()
244 if (ctlr->mem_ops) { in spi_mem_exec_op()
251 if (ctlr->auto_runtime_pm) { in spi_mem_exec_op()
252 ret = pm_runtime_get_sync(ctlr->dev.parent); in spi_mem_exec_op()
254 dev_err(&ctlr->dev, in spi_mem_exec_op()
261 mutex_lock(&ctlr->bus_lock_mutex); in spi_mem_exec_op()
262 mutex_lock(&ctlr->io_mutex); in spi_mem_exec_op()
263 ret = ctlr->mem_ops->exec_op(mem, op); in spi_mem_exec_op()
264 mutex_unlock(&ctlr->io_mutex); in spi_mem_exec_op()
265 mutex_unlock(&ctlr->bus_lock_mutex); in spi_mem_exec_op()
267 if (ctlr->auto_runtime_pm) in spi_mem_exec_op()
268 pm_runtime_put(ctlr->dev.parent); in spi_mem_exec_op()
275 if (!ret || ret != -ENOTSUPP) in spi_mem_exec_op()
279 tmpbufsize = sizeof(op->cmd.opcode) + op->addr.nbytes + in spi_mem_exec_op()
280 op->dummy.nbytes; in spi_mem_exec_op()
284 * we're guaranteed that this buffer is DMA-able, as required by the in spi_mem_exec_op()
289 return -ENOMEM; in spi_mem_exec_op()
293 tmpbuf[0] = op->cmd.opcode; in spi_mem_exec_op()
295 xfers[xferpos].len = sizeof(op->cmd.opcode); in spi_mem_exec_op()
296 xfers[xferpos].tx_nbits = op->cmd.buswidth; in spi_mem_exec_op()
301 if (op->addr.nbytes) { in spi_mem_exec_op()
304 for (i = 0; i < op->addr.nbytes; i++) in spi_mem_exec_op()
305 tmpbuf[i + 1] = op->addr.val >> in spi_mem_exec_op()
306 (8 * (op->addr.nbytes - i - 1)); in spi_mem_exec_op()
309 xfers[xferpos].len = op->addr.nbytes; in spi_mem_exec_op()
310 xfers[xferpos].tx_nbits = op->addr.buswidth; in spi_mem_exec_op()
313 totalxferlen += op->addr.nbytes; in spi_mem_exec_op()
316 if (op->dummy.nbytes) { in spi_mem_exec_op()
317 memset(tmpbuf + op->addr.nbytes + 1, 0xff, op->dummy.nbytes); in spi_mem_exec_op()
318 xfers[xferpos].tx_buf = tmpbuf + op->addr.nbytes + 1; in spi_mem_exec_op()
319 xfers[xferpos].len = op->dummy.nbytes; in spi_mem_exec_op()
320 xfers[xferpos].tx_nbits = op->dummy.buswidth; in spi_mem_exec_op()
323 totalxferlen += op->dummy.nbytes; in spi_mem_exec_op()
326 if (op->data.nbytes) { in spi_mem_exec_op()
327 if (op->data.dir == SPI_MEM_DATA_IN) { in spi_mem_exec_op()
328 xfers[xferpos].rx_buf = op->data.buf.in; in spi_mem_exec_op()
329 xfers[xferpos].rx_nbits = op->data.buswidth; in spi_mem_exec_op()
331 xfers[xferpos].tx_buf = op->data.buf.out; in spi_mem_exec_op()
332 xfers[xferpos].tx_nbits = op->data.buswidth; in spi_mem_exec_op()
335 xfers[xferpos].len = op->data.nbytes; in spi_mem_exec_op()
338 totalxferlen += op->data.nbytes; in spi_mem_exec_op()
341 ret = spi_sync(mem->spi, &msg); in spi_mem_exec_op()
349 return -EIO; in spi_mem_exec_op()
356 * spi_mem_get_name() - Return the SPI mem device name to be used by the
358 * @mem: the SPI memory
360 * This function allows SPI mem users to retrieve the SPI mem device name.
365 * by the SPI mem user
367 const char *spi_mem_get_name(struct spi_mem *mem) in spi_mem_get_name() argument
369 return mem->name; in spi_mem_get_name()
374 * spi_mem_adjust_op_size() - Adjust the data size of a SPI mem operation to
376 * @mem: the SPI memory
381 * optimized accesses. This function allows SPI mem drivers to split a single
382 * operation into multiple sub-operations when required.
385 * 0 otherwise. Note that @op->data.nbytes will be updated if @op
388 int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) in spi_mem_adjust_op_size() argument
390 struct spi_controller *ctlr = mem->spi->controller; in spi_mem_adjust_op_size()
393 len = sizeof(op->cmd.opcode) + op->addr.nbytes + op->dummy.nbytes; in spi_mem_adjust_op_size()
395 if (ctlr->mem_ops && ctlr->mem_ops->adjust_op_size) in spi_mem_adjust_op_size()
396 return ctlr->mem_ops->adjust_op_size(mem, op); in spi_mem_adjust_op_size()
398 if (!ctlr->mem_ops || !ctlr->mem_ops->exec_op) { in spi_mem_adjust_op_size()
399 if (len > spi_max_transfer_size(mem->spi)) in spi_mem_adjust_op_size()
400 return -EINVAL; in spi_mem_adjust_op_size()
402 op->data.nbytes = min3((size_t)op->data.nbytes, in spi_mem_adjust_op_size()
403 spi_max_transfer_size(mem->spi), in spi_mem_adjust_op_size()
404 spi_max_message_size(mem->spi) - in spi_mem_adjust_op_size()
406 if (!op->data.nbytes) in spi_mem_adjust_op_size()
407 return -EINVAL; in spi_mem_adjust_op_size()
421 struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver); in spi_mem_probe()
422 struct spi_controller *ctlr = spi->controller; in spi_mem_probe()
423 struct spi_mem *mem; in spi_mem_probe() local
425 mem = devm_kzalloc(&spi->dev, sizeof(*mem), GFP_KERNEL); in spi_mem_probe()
426 if (!mem) in spi_mem_probe()
427 return -ENOMEM; in spi_mem_probe()
429 mem->spi = spi; in spi_mem_probe()
431 if (ctlr->mem_ops && ctlr->mem_ops->get_name) in spi_mem_probe()
432 mem->name = ctlr->mem_ops->get_name(mem); in spi_mem_probe()
434 mem->name = dev_name(&spi->dev); in spi_mem_probe()
436 if (IS_ERR_OR_NULL(mem->name)) in spi_mem_probe()
437 return PTR_ERR(mem->name); in spi_mem_probe()
439 spi_set_drvdata(spi, mem); in spi_mem_probe()
441 return memdrv->probe(mem); in spi_mem_probe()
446 struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver); in spi_mem_remove()
447 struct spi_mem *mem = spi_get_drvdata(spi); in spi_mem_remove() local
449 if (memdrv->remove) in spi_mem_remove()
450 return memdrv->remove(mem); in spi_mem_remove()
457 struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver); in spi_mem_shutdown()
458 struct spi_mem *mem = spi_get_drvdata(spi); in spi_mem_shutdown() local
460 if (memdrv->shutdown) in spi_mem_shutdown()
461 memdrv->shutdown(mem); in spi_mem_shutdown()
465 * spi_mem_driver_register_with_owner() - Register a SPI memory driver
477 memdrv->spidrv.probe = spi_mem_probe; in spi_mem_driver_register_with_owner()
478 memdrv->spidrv.remove = spi_mem_remove; in spi_mem_driver_register_with_owner()
479 memdrv->spidrv.shutdown = spi_mem_shutdown; in spi_mem_driver_register_with_owner()
481 return __spi_register_driver(owner, &memdrv->spidrv); in spi_mem_driver_register_with_owner()
486 * spi_mem_driver_unregister_with_owner() - Unregister a SPI memory driver
493 spi_unregister_driver(&memdrv->spidrv); in spi_mem_driver_unregister()