11 #include <linux/spi/spi-mem.h>
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()
140 bool spi_mem_default_supports_op(struct spi_mem *mem,  in spi_mem_default_supports_op()  argument
143 	if (spi_check_buswidth_req(mem, op->cmd.buswidth, true))  in spi_mem_default_supports_op()
147 	    spi_check_buswidth_req(mem, op->addr.buswidth, true))  in spi_mem_default_supports_op()
151 	    spi_check_buswidth_req(mem, op->dummy.buswidth, true))  in spi_mem_default_supports_op()
155 	    spi_check_buswidth_req(mem, op->data.buswidth,  in spi_mem_default_supports_op()
196 static bool spi_mem_internal_supports_op(struct spi_mem *mem,  in spi_mem_internal_supports_op()  argument
199 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_internal_supports_op()
202 		return ctlr->mem_ops->supports_op(mem, op);  in spi_mem_internal_supports_op()
204 	return spi_mem_default_supports_op(mem, op);  in spi_mem_internal_supports_op()
210  * @mem: the SPI memory
222 bool spi_mem_supports_op(struct spi_mem *mem, const struct spi_mem_op *op)  in spi_mem_supports_op()  argument
227 	return spi_mem_internal_supports_op(mem, op);  in spi_mem_supports_op()
231 static int spi_mem_access_start(struct spi_mem *mem)  in spi_mem_access_start()  argument
233 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_access_start()
259 static void spi_mem_access_end(struct spi_mem *mem)  in spi_mem_access_end()  argument
261 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_access_end()
272  * @mem: the SPI memory
282 int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)  in spi_mem_exec_op()  argument
285 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_exec_op()
295 	if (!spi_mem_internal_supports_op(mem, op))  in spi_mem_exec_op()
298 	if (ctlr->mem_ops && !mem->spi->cs_gpiod) {  in spi_mem_exec_op()
299 		ret = spi_mem_access_start(mem);  in spi_mem_exec_op()
303 		ret = ctlr->mem_ops->exec_op(mem, op);  in spi_mem_exec_op()
305 		spi_mem_access_end(mem);  in spi_mem_exec_op()
377 	ret = spi_sync(mem->spi, &msg);  in spi_mem_exec_op()
392  * spi_mem_get_name() - Return the SPI mem device name to be used by the
394  * @mem: the SPI memory
396  * This function allows SPI mem users to retrieve the SPI mem device name.
401  *	   by the SPI mem user
403 const char *spi_mem_get_name(struct spi_mem *mem)  in spi_mem_get_name()  argument
405 	return mem->name;  in spi_mem_get_name()
410  * spi_mem_adjust_op_size() - Adjust the data size of a SPI mem operation to
412  * @mem: the SPI memory
417  * optimized accesses. This function allows SPI mem drivers to split a single
424 int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)  in spi_mem_adjust_op_size()  argument
426 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_adjust_op_size()
430 		return ctlr->mem_ops->adjust_op_size(mem, op);  in spi_mem_adjust_op_size()
435 		if (len > spi_max_transfer_size(mem->spi))  in spi_mem_adjust_op_size()
439 				       spi_max_transfer_size(mem->spi),  in spi_mem_adjust_op_size()
440 				       spi_max_message_size(mem->spi) -  in spi_mem_adjust_op_size()
459 	ret = spi_mem_adjust_op_size(desc->mem, &op);  in spi_mem_no_dirmap_read()
463 	ret = spi_mem_exec_op(desc->mem, &op);  in spi_mem_no_dirmap_read()
479 	ret = spi_mem_adjust_op_size(desc->mem, &op);  in spi_mem_no_dirmap_write()
483 	ret = spi_mem_exec_op(desc->mem, &op);  in spi_mem_no_dirmap_write()
492  * @mem: SPI mem device this direct mapping should be created for
504 spi_mem_dirmap_create(struct spi_mem *mem,  in spi_mem_dirmap_create()  argument
507 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_dirmap_create()
523 	desc->mem = mem;  in spi_mem_dirmap_create()
530 		if (!spi_mem_supports_op(desc->mem, &desc->info.op_tmpl))  in spi_mem_dirmap_create()
554 	struct spi_controller *ctlr = desc->mem->spi->controller;  in spi_mem_dirmap_destroy()
574  * @mem: SPI mem device this direct mapping should be created for
583 devm_spi_mem_dirmap_create(struct device *dev, struct spi_mem *mem,  in devm_spi_mem_dirmap_create()  argument
593 	desc = spi_mem_dirmap_create(mem, info);  in devm_spi_mem_dirmap_create()
651 	struct spi_controller *ctlr = desc->mem->spi->controller;  in spi_mem_dirmap_read()
663 		ret = spi_mem_access_start(desc->mem);  in spi_mem_dirmap_read()
669 		spi_mem_access_end(desc->mem);  in spi_mem_dirmap_read()
697 	struct spi_controller *ctlr = desc->mem->spi->controller;  in spi_mem_dirmap_write()
709 		ret = spi_mem_access_start(desc->mem);  in spi_mem_dirmap_write()
715 		spi_mem_access_end(desc->mem);  in spi_mem_dirmap_write()
733 	struct spi_mem *mem;  in spi_mem_probe()  local
735 	mem = devm_kzalloc(&spi->dev, sizeof(*mem), GFP_KERNEL);  in spi_mem_probe()
736 	if (!mem)  in spi_mem_probe()
739 	mem->spi = spi;  in spi_mem_probe()
742 		mem->name = ctlr->mem_ops->get_name(mem);  in spi_mem_probe()
744 		mem->name = dev_name(&spi->dev);  in spi_mem_probe()
746 	if (IS_ERR_OR_NULL(mem->name))  in spi_mem_probe()
747 		return PTR_ERR(mem->name);  in spi_mem_probe()
749 	spi_set_drvdata(spi, mem);  in spi_mem_probe()
751 	return memdrv->probe(mem);  in spi_mem_probe()
757 	struct spi_mem *mem = spi_get_drvdata(spi);  in spi_mem_remove()  local
760 		return memdrv->remove(mem);  in spi_mem_remove()
768 	struct spi_mem *mem = spi_get_drvdata(spi);  in spi_mem_shutdown()  local
771 		memdrv->shutdown(mem);  in spi_mem_shutdown()