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()
258 static void spi_mem_access_end(struct spi_mem *mem)  in spi_mem_access_end()  argument
260 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_access_end()
271  * @mem: the SPI memory
281 int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)  in spi_mem_exec_op()  argument
284 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_exec_op()
294 	if (!spi_mem_internal_supports_op(mem, op))  in spi_mem_exec_op()
297 	if (ctlr->mem_ops && !mem->spi->cs_gpiod) {  in spi_mem_exec_op()
298 		ret = spi_mem_access_start(mem);  in spi_mem_exec_op()
302 		ret = ctlr->mem_ops->exec_op(mem, op);  in spi_mem_exec_op()
304 		spi_mem_access_end(mem);  in spi_mem_exec_op()
376 	ret = spi_sync(mem->spi, &msg);  in spi_mem_exec_op()
391  * spi_mem_get_name() - Return the SPI mem device name to be used by the
393  * @mem: the SPI memory
395  * This function allows SPI mem users to retrieve the SPI mem device name.
400  *	   by the SPI mem user
402 const char *spi_mem_get_name(struct spi_mem *mem)  in spi_mem_get_name()  argument
404 	return mem->name;  in spi_mem_get_name()
409  * spi_mem_adjust_op_size() - Adjust the data size of a SPI mem operation to
411  * @mem: the SPI memory
416  * optimized accesses. This function allows SPI mem drivers to split a single
423 int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)  in spi_mem_adjust_op_size()  argument
425 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_adjust_op_size()
429 		return ctlr->mem_ops->adjust_op_size(mem, op);  in spi_mem_adjust_op_size()
434 		if (len > spi_max_transfer_size(mem->spi))  in spi_mem_adjust_op_size()
438 				       spi_max_transfer_size(mem->spi),  in spi_mem_adjust_op_size()
439 				       spi_max_message_size(mem->spi) -  in spi_mem_adjust_op_size()
458 	ret = spi_mem_adjust_op_size(desc->mem, &op);  in spi_mem_no_dirmap_read()
462 	ret = spi_mem_exec_op(desc->mem, &op);  in spi_mem_no_dirmap_read()
478 	ret = spi_mem_adjust_op_size(desc->mem, &op);  in spi_mem_no_dirmap_write()
482 	ret = spi_mem_exec_op(desc->mem, &op);  in spi_mem_no_dirmap_write()
491  * @mem: SPI mem device this direct mapping should be created for
503 spi_mem_dirmap_create(struct spi_mem *mem,  in spi_mem_dirmap_create()  argument
506 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_dirmap_create()
522 	desc->mem = mem;  in spi_mem_dirmap_create()
529 		if (!spi_mem_supports_op(desc->mem, &desc->info.op_tmpl))  in spi_mem_dirmap_create()
553 	struct spi_controller *ctlr = desc->mem->spi->controller;  in spi_mem_dirmap_destroy()
573  * @mem: SPI mem device this direct mapping should be created for
582 devm_spi_mem_dirmap_create(struct device *dev, struct spi_mem *mem,  in devm_spi_mem_dirmap_create()  argument
592 	desc = spi_mem_dirmap_create(mem, info);  in devm_spi_mem_dirmap_create()
650 	struct spi_controller *ctlr = desc->mem->spi->controller;  in spi_mem_dirmap_read()
662 		ret = spi_mem_access_start(desc->mem);  in spi_mem_dirmap_read()
668 		spi_mem_access_end(desc->mem);  in spi_mem_dirmap_read()
696 	struct spi_controller *ctlr = desc->mem->spi->controller;  in spi_mem_dirmap_write()
708 		ret = spi_mem_access_start(desc->mem);  in spi_mem_dirmap_write()
714 		spi_mem_access_end(desc->mem);  in spi_mem_dirmap_write()
732 	struct spi_mem *mem;  in spi_mem_probe()  local
734 	mem = devm_kzalloc(&spi->dev, sizeof(*mem), GFP_KERNEL);  in spi_mem_probe()
735 	if (!mem)  in spi_mem_probe()
738 	mem->spi = spi;  in spi_mem_probe()
741 		mem->name = ctlr->mem_ops->get_name(mem);  in spi_mem_probe()
743 		mem->name = dev_name(&spi->dev);  in spi_mem_probe()
745 	if (IS_ERR_OR_NULL(mem->name))  in spi_mem_probe()
746 		return PTR_ERR(mem->name);  in spi_mem_probe()
748 	spi_set_drvdata(spi, mem);  in spi_mem_probe()
750 	return memdrv->probe(mem);  in spi_mem_probe()
756 	struct spi_mem *mem = spi_get_drvdata(spi);  in spi_mem_remove()  local
759 		return memdrv->remove(mem);  in spi_mem_remove()
767 	struct spi_mem *mem = spi_get_drvdata(spi);  in spi_mem_shutdown()  local
770 		memdrv->shutdown(mem);  in spi_mem_shutdown()