12 #include <linux/spi/spi-mem.h>
104 static int spi_check_buswidth_req(struct spi_mem *mem, u8 buswidth, bool tx)  in spi_check_buswidth_req()  argument
106 	u32 mode = mem->spi->mode;  in spi_check_buswidth_req()
142 static bool spi_mem_check_buswidth(struct spi_mem *mem,  in spi_mem_check_buswidth()  argument
145 	if (spi_check_buswidth_req(mem, op->cmd.buswidth, true))  in spi_mem_check_buswidth()
149 	    spi_check_buswidth_req(mem, op->addr.buswidth, true))  in spi_mem_check_buswidth()
153 	    spi_check_buswidth_req(mem, op->dummy.buswidth, true))  in spi_mem_check_buswidth()
157 	    spi_check_buswidth_req(mem, op->data.buswidth,  in spi_mem_check_buswidth()
164 bool spi_mem_default_supports_op(struct spi_mem *mem,  in spi_mem_default_supports_op()  argument
167 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_default_supports_op()
190 	if (op->max_freq && mem->spi->controller->min_speed_hz &&  in spi_mem_default_supports_op()
191 	    op->max_freq < mem->spi->controller->min_speed_hz)  in spi_mem_default_supports_op()
195 	    op->max_freq < mem->spi->max_speed_hz) {  in spi_mem_default_supports_op()
200 	return spi_mem_check_buswidth(mem, op);  in spi_mem_default_supports_op()
240 static bool spi_mem_internal_supports_op(struct spi_mem *mem,  in spi_mem_internal_supports_op()  argument
243 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_internal_supports_op()
246 		return ctlr->mem_ops->supports_op(mem, op);  in spi_mem_internal_supports_op()
248 	return spi_mem_default_supports_op(mem, op);  in spi_mem_internal_supports_op()
254  * @mem: the SPI memory
266 bool spi_mem_supports_op(struct spi_mem *mem, const struct spi_mem_op *op)  in spi_mem_supports_op()  argument
271 	return spi_mem_internal_supports_op(mem, op);  in spi_mem_supports_op()
275 static int spi_mem_access_start(struct spi_mem *mem)  in spi_mem_access_start()  argument
277 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_access_start()
302 static void spi_mem_access_end(struct spi_mem *mem)  in spi_mem_access_end()  argument
304 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_access_end()
358  * @mem: the SPI memory
368 int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)  in spi_mem_exec_op()  argument
371 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_exec_op()
378 	spi_mem_adjust_op_freq(mem, (struct spi_mem_op *)op);  in spi_mem_exec_op()
384 	if (!spi_mem_internal_supports_op(mem, op))  in spi_mem_exec_op()
387 	if (ctlr->mem_ops && ctlr->mem_ops->exec_op && !spi_get_csgpiod(mem->spi, 0)) {  in spi_mem_exec_op()
388 		ret = spi_mem_access_start(mem);  in spi_mem_exec_op()
392 		ret = ctlr->mem_ops->exec_op(mem, op);  in spi_mem_exec_op()
394 		spi_mem_access_end(mem);  in spi_mem_exec_op()
403 			spi_mem_add_op_stats(mem->spi->pcpu_statistics, op, ret);  in spi_mem_exec_op()
475 	ret = spi_sync(mem->spi, &msg);  in spi_mem_exec_op()
490  * spi_mem_get_name() - Return the SPI mem device name to be used by the
492  * @mem: the SPI memory
494  * This function allows SPI mem users to retrieve the SPI mem device name.
499  *	   by the SPI mem user
501 const char *spi_mem_get_name(struct spi_mem *mem)  in spi_mem_get_name()  argument
503 	return mem->name;  in spi_mem_get_name()
508  * spi_mem_adjust_op_size() - Adjust the data size of a SPI mem operation to
510  * @mem: the SPI memory
515  * optimized accesses. This function allows SPI mem drivers to split a single
522 int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)  in spi_mem_adjust_op_size()  argument
524 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_adjust_op_size()
528 		return ctlr->mem_ops->adjust_op_size(mem, op);  in spi_mem_adjust_op_size()
533 		if (len > spi_max_transfer_size(mem->spi))  in spi_mem_adjust_op_size()
537 				       spi_max_transfer_size(mem->spi),  in spi_mem_adjust_op_size()
538 				       spi_max_message_size(mem->spi) -  in spi_mem_adjust_op_size()
549  * spi_mem_adjust_op_freq() - Adjust the frequency of a SPI mem operation to
551  * @mem: the SPI memory
555  * speed. This function allows SPI mem drivers to set @op->max_freq to the
558 void spi_mem_adjust_op_freq(struct spi_mem *mem, struct spi_mem_op *op)  in spi_mem_adjust_op_freq()  argument
560 	if (!op->max_freq || op->max_freq > mem->spi->max_speed_hz)  in spi_mem_adjust_op_freq()
561 		op->max_freq = mem->spi->max_speed_hz;  in spi_mem_adjust_op_freq()
604 	ret = spi_mem_adjust_op_size(desc->mem, &op);  in spi_mem_no_dirmap_read()
608 	ret = spi_mem_exec_op(desc->mem, &op);  in spi_mem_no_dirmap_read()
624 	ret = spi_mem_adjust_op_size(desc->mem, &op);  in spi_mem_no_dirmap_write()
628 	ret = spi_mem_exec_op(desc->mem, &op);  in spi_mem_no_dirmap_write()
637  * @mem: SPI mem device this direct mapping should be created for
649 spi_mem_dirmap_create(struct spi_mem *mem,  in spi_mem_dirmap_create()  argument
652 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_dirmap_create()
668 	desc->mem = mem;  in spi_mem_dirmap_create()
675 		if (!spi_mem_supports_op(desc->mem, &desc->info.op_tmpl))  in spi_mem_dirmap_create()
699 	struct spi_controller *ctlr = desc->mem->spi->controller;  in spi_mem_dirmap_destroy()
719  * @mem: SPI mem device this direct mapping should be created for
728 devm_spi_mem_dirmap_create(struct device *dev, struct spi_mem *mem,  in devm_spi_mem_dirmap_create()  argument
738 	desc = spi_mem_dirmap_create(mem, info);  in devm_spi_mem_dirmap_create()
796 	struct spi_controller *ctlr = desc->mem->spi->controller;  in spi_mem_dirmap_read()
808 		ret = spi_mem_access_start(desc->mem);  in spi_mem_dirmap_read()
814 		spi_mem_access_end(desc->mem);  in spi_mem_dirmap_read()
842 	struct spi_controller *ctlr = desc->mem->spi->controller;  in spi_mem_dirmap_write()
854 		ret = spi_mem_access_start(desc->mem);  in spi_mem_dirmap_write()
860 		spi_mem_access_end(desc->mem);  in spi_mem_dirmap_write()
874 static int spi_mem_read_status(struct spi_mem *mem,  in spi_mem_read_status()  argument
881 	ret = spi_mem_exec_op(mem, op);  in spi_mem_read_status()
895  * @mem: SPI memory device
909 int spi_mem_poll_status(struct spi_mem *mem,  in spi_mem_poll_status()  argument
916 	struct spi_controller *ctlr = mem->spi->controller;  in spi_mem_poll_status()
925 	if (ctlr->mem_ops && ctlr->mem_ops->poll_status && !spi_get_csgpiod(mem->spi, 0)) {  in spi_mem_poll_status()
926 		ret = spi_mem_access_start(mem);  in spi_mem_poll_status()
930 		ret = ctlr->mem_ops->poll_status(mem, op, mask, match,  in spi_mem_poll_status()
934 		spi_mem_access_end(mem);  in spi_mem_poll_status()
938 		if (!spi_mem_supports_op(mem, op))  in spi_mem_poll_status()
949 					polling_delay_us, timeout_ms * 1000, false, mem,  in spi_mem_poll_status()
963 	struct spi_mem *mem;  in spi_mem_probe()  local
965 	mem = devm_kzalloc(&spi->dev, sizeof(*mem), GFP_KERNEL);  in spi_mem_probe()
966 	if (!mem)  in spi_mem_probe()
969 	mem->spi = spi;  in spi_mem_probe()
972 		mem->name = ctlr->mem_ops->get_name(mem);  in spi_mem_probe()
974 		mem->name = dev_name(&spi->dev);  in spi_mem_probe()
976 	if (IS_ERR_OR_NULL(mem->name))  in spi_mem_probe()
977 		return PTR_ERR_OR_ZERO(mem->name);  in spi_mem_probe()
979 	spi_set_drvdata(spi, mem);  in spi_mem_probe()
981 	return memdrv->probe(mem);  in spi_mem_probe()
987 	struct spi_mem *mem = spi_get_drvdata(spi);  in spi_mem_remove()  local
990 		memdrv->remove(mem);  in spi_mem_remove()
996 	struct spi_mem *mem = spi_get_drvdata(spi);  in spi_mem_shutdown()  local
999 		memdrv->shutdown(mem);  in spi_mem_shutdown()