117 #define cdns_i2c_readreg(offset)       readl_relaxed(id->membase + offset)
118 #define cdns_i2c_writereg(val, offset) writel_relaxed(val, id->membase + offset)
172  * @id:	Pointer to driver data struct
176 static void cdns_i2c_clear_bus_hold(struct cdns_i2c *id)  in cdns_i2c_clear_bus_hold()  argument
183 static inline bool cdns_is_holdquirk(struct cdns_i2c *id, bool hold_wrkaround)  in cdns_is_holdquirk()  argument
186 		(id->curr_recv_count == CDNS_I2C_FIFO_DEPTH + 1));  in cdns_is_holdquirk()
204 	struct cdns_i2c *id = ptr;  in cdns_i2c_isr()  local
223 	if (id->recv_count > id->curr_recv_count)  in cdns_i2c_isr()
226 	hold_quirk = (id->quirks & CDNS_I2C_BROKEN_HOLD_BIT) && updatetx;  in cdns_i2c_isr()
229 	if (id->p_recv_buf &&  in cdns_i2c_isr()
240 			if ((id->recv_count < CDNS_I2C_FIFO_DEPTH) &&  in cdns_i2c_isr()
241 			    !id->bus_hold_flag)  in cdns_i2c_isr()
242 				cdns_i2c_clear_bus_hold(id);  in cdns_i2c_isr()
244 			*(id->p_recv_buf)++ =  in cdns_i2c_isr()
246 			id->recv_count--;  in cdns_i2c_isr()
247 			id->curr_recv_count--;  in cdns_i2c_isr()
249 			if (cdns_is_holdquirk(id, hold_quirk))  in cdns_i2c_isr()
260 		if (cdns_is_holdquirk(id, hold_quirk)) {  in cdns_i2c_isr()
263 			       (id->curr_recv_count - CDNS_I2C_FIFO_DEPTH))  in cdns_i2c_isr()
270 			if (((int)(id->recv_count) - CDNS_I2C_FIFO_DEPTH) >  in cdns_i2c_isr()
274 				id->curr_recv_count = CDNS_I2C_TRANSFER_SIZE +  in cdns_i2c_isr()
277 				cdns_i2c_writereg(id->recv_count -  in cdns_i2c_isr()
280 				id->curr_recv_count = id->recv_count;  in cdns_i2c_isr()
282 		} else if (id->recv_count && !hold_quirk &&  in cdns_i2c_isr()
283 						!id->curr_recv_count) {  in cdns_i2c_isr()
286 			cdns_i2c_writereg(id->p_msg->addr & CDNS_I2C_ADDR_MASK,  in cdns_i2c_isr()
289 			if (id->recv_count > CDNS_I2C_TRANSFER_SIZE) {  in cdns_i2c_isr()
292 				id->curr_recv_count = CDNS_I2C_TRANSFER_SIZE;  in cdns_i2c_isr()
294 				cdns_i2c_writereg(id->recv_count,  in cdns_i2c_isr()
296 				id->curr_recv_count = id->recv_count;  in cdns_i2c_isr()
301 		if ((isr_status & CDNS_I2C_IXR_COMP) && !id->recv_count) {  in cdns_i2c_isr()
302 			if (!id->bus_hold_flag)  in cdns_i2c_isr()
303 				cdns_i2c_clear_bus_hold(id);  in cdns_i2c_isr()
311 	if ((isr_status & CDNS_I2C_IXR_COMP) && !id->p_recv_buf) {  in cdns_i2c_isr()
316 		if (id->send_count) {  in cdns_i2c_isr()
319 			if (id->send_count > avail_bytes)  in cdns_i2c_isr()
322 				bytes_to_send = id->send_count;  in cdns_i2c_isr()
326 					(*(id->p_send_buf)++),  in cdns_i2c_isr()
328 				id->send_count--;  in cdns_i2c_isr()
338 		if (!id->send_count && !id->bus_hold_flag)  in cdns_i2c_isr()
339 			cdns_i2c_clear_bus_hold(id);  in cdns_i2c_isr()
345 	id->err_status = isr_status & CDNS_I2C_IXR_ERR_INTR_MASK;  in cdns_i2c_isr()
346 	if (id->err_status)  in cdns_i2c_isr()
350 		complete(&id->xfer_done);  in cdns_i2c_isr()
357  * @id:		pointer to the i2c device structure
359 static void cdns_i2c_mrecv(struct cdns_i2c *id)  in cdns_i2c_mrecv()  argument
364 	id->p_recv_buf = id->p_msg->buf;  in cdns_i2c_mrecv()
365 	id->recv_count = id->p_msg->len;  in cdns_i2c_mrecv()
371 	if (id->p_msg->flags & I2C_M_RECV_LEN)  in cdns_i2c_mrecv()
372 		id->recv_count = I2C_SMBUS_BLOCK_MAX + 1;  in cdns_i2c_mrecv()
374 	id->curr_recv_count = id->recv_count;  in cdns_i2c_mrecv()
380 	if ((id->recv_count > CDNS_I2C_FIFO_DEPTH)  || id->bus_hold_flag)  in cdns_i2c_mrecv()
397 	if (id->recv_count > CDNS_I2C_TRANSFER_SIZE) {  in cdns_i2c_mrecv()
400 		id->curr_recv_count = CDNS_I2C_TRANSFER_SIZE;  in cdns_i2c_mrecv()
402 		cdns_i2c_writereg(id->recv_count, CDNS_I2C_XFER_SIZE_OFFSET);  in cdns_i2c_mrecv()
406 	cdns_i2c_writereg(id->p_msg->addr & CDNS_I2C_ADDR_MASK,  in cdns_i2c_mrecv()
409 	if (!id->bus_hold_flag &&  in cdns_i2c_mrecv()
410 		((id->p_msg->flags & I2C_M_RECV_LEN) != I2C_M_RECV_LEN) &&  in cdns_i2c_mrecv()
411 		(id->recv_count <= CDNS_I2C_FIFO_DEPTH))  in cdns_i2c_mrecv()
412 			cdns_i2c_clear_bus_hold(id);  in cdns_i2c_mrecv()
418  * @id:		pointer to the i2c device
420 static void cdns_i2c_msend(struct cdns_i2c *id)  in cdns_i2c_msend()  argument
427 	id->p_recv_buf = NULL;  in cdns_i2c_msend()
428 	id->p_send_buf = id->p_msg->buf;  in cdns_i2c_msend()
429 	id->send_count = id->p_msg->len;  in cdns_i2c_msend()
440 	if ((id->send_count > CDNS_I2C_FIFO_DEPTH) || id->bus_hold_flag)  in cdns_i2c_msend()
459 	if (id->send_count > avail_bytes)  in cdns_i2c_msend()
462 		bytes_to_send = id->send_count;  in cdns_i2c_msend()
465 		cdns_i2c_writereg((*(id->p_send_buf)++), CDNS_I2C_DATA_OFFSET);  in cdns_i2c_msend()
466 		id->send_count--;  in cdns_i2c_msend()
473 	if (!id->bus_hold_flag && !id->send_count)  in cdns_i2c_msend()
474 		cdns_i2c_clear_bus_hold(id);  in cdns_i2c_msend()
476 	cdns_i2c_writereg(id->p_msg->addr & CDNS_I2C_ADDR_MASK,  in cdns_i2c_msend()
491 	struct cdns_i2c *id = adap->algo_data;  in cdns_i2c_master_reset()  local
511 static int cdns_i2c_process_msg(struct cdns_i2c *id, struct i2c_msg *msg,  in cdns_i2c_process_msg()  argument
517 	id->p_msg = msg;  in cdns_i2c_process_msg()
518 	id->err_status = 0;  in cdns_i2c_process_msg()
519 	reinit_completion(&id->xfer_done);  in cdns_i2c_process_msg()
535 		cdns_i2c_mrecv(id);  in cdns_i2c_process_msg()
537 		cdns_i2c_msend(id);  in cdns_i2c_process_msg()
540 	time_left = wait_for_completion_timeout(&id->xfer_done, adap->timeout);  in cdns_i2c_process_msg()
543 		dev_err(id->adap.dev.parent,  in cdns_i2c_process_msg()
552 	if (id->err_status & CDNS_I2C_IXR_ARB_LOST)  in cdns_i2c_process_msg()
573 	struct cdns_i2c *id = adap->algo_data;  in cdns_i2c_master_xfer()  local
576 	ret = pm_runtime_get_sync(id->dev);  in cdns_i2c_master_xfer()
585 	hold_quirk = !!(id->quirks & CDNS_I2C_BROKEN_HOLD_BIT);  in cdns_i2c_master_xfer()
606 		id->bus_hold_flag = 1;  in cdns_i2c_master_xfer()
611 		id->bus_hold_flag = 0;  in cdns_i2c_master_xfer()
617 			id->bus_hold_flag = 0;  in cdns_i2c_master_xfer()
619 		ret = cdns_i2c_process_msg(id, msgs, adap);  in cdns_i2c_master_xfer()
624 		if (id->err_status) {  in cdns_i2c_master_xfer()
627 			if (id->err_status & CDNS_I2C_IXR_NACK) {  in cdns_i2c_master_xfer()
638 	pm_runtime_mark_last_busy(id->dev);  in cdns_i2c_master_xfer()
639 	pm_runtime_put_autosuspend(id->dev);  in cdns_i2c_master_xfer()
724  * @id:		Pointer to the I2C device structure
737 static int cdns_i2c_setclk(unsigned long clk_in, struct cdns_i2c *id)  in cdns_i2c_setclk()  argument
742 	unsigned long fscl = id->i2c_clk;  in cdns_i2c_setclk()
777 	struct cdns_i2c *id = to_cdns_i2c(nb);  in cdns_i2c_clk_notifier_cb()  local
779 	if (pm_runtime_suspended(id->dev))  in cdns_i2c_clk_notifier_cb()
786 		unsigned long fscl = id->i2c_clk;  in cdns_i2c_clk_notifier_cb()
792 			dev_warn(id->adap.dev.parent,  in cdns_i2c_clk_notifier_cb()
799 			cdns_i2c_setclk(ndata->new_rate, id);  in cdns_i2c_clk_notifier_cb()
804 		id->input_clk = ndata->new_rate;  in cdns_i2c_clk_notifier_cb()
807 			cdns_i2c_setclk(ndata->new_rate, id);  in cdns_i2c_clk_notifier_cb()
812 			cdns_i2c_setclk(ndata->old_rate, id);  in cdns_i2c_clk_notifier_cb()
887 	struct cdns_i2c *id;  in cdns_i2c_probe()  local
891 	id = devm_kzalloc(&pdev->dev, sizeof(*id), GFP_KERNEL);  in cdns_i2c_probe()
892 	if (!id)  in cdns_i2c_probe()
895 	id->dev = &pdev->dev;  in cdns_i2c_probe()
896 	platform_set_drvdata(pdev, id);  in cdns_i2c_probe()
901 		id->quirks = data->quirks;  in cdns_i2c_probe()
905 	id->membase = devm_ioremap_resource(&pdev->dev, r_mem);  in cdns_i2c_probe()
906 	if (IS_ERR(id->membase))  in cdns_i2c_probe()
907 		return PTR_ERR(id->membase);  in cdns_i2c_probe()
909 	id->irq = platform_get_irq(pdev, 0);  in cdns_i2c_probe()
911 	id->adap.owner = THIS_MODULE;  in cdns_i2c_probe()
912 	id->adap.dev.of_node = pdev->dev.of_node;  in cdns_i2c_probe()
913 	id->adap.algo = &cdns_i2c_algo;  in cdns_i2c_probe()
914 	id->adap.timeout = CDNS_I2C_TIMEOUT;  in cdns_i2c_probe()
915 	id->adap.retries = 3;		/* Default retry value. */  in cdns_i2c_probe()
916 	id->adap.algo_data = id;  in cdns_i2c_probe()
917 	id->adap.dev.parent = &pdev->dev;  in cdns_i2c_probe()
918 	init_completion(&id->xfer_done);  in cdns_i2c_probe()
919 	snprintf(id->adap.name, sizeof(id->adap.name),  in cdns_i2c_probe()
922 	id->clk = devm_clk_get(&pdev->dev, NULL);  in cdns_i2c_probe()
923 	if (IS_ERR(id->clk)) {  in cdns_i2c_probe()
925 		return PTR_ERR(id->clk);  in cdns_i2c_probe()
927 	ret = clk_prepare_enable(id->clk);  in cdns_i2c_probe()
931 	pm_runtime_enable(id->dev);  in cdns_i2c_probe()
932 	pm_runtime_set_autosuspend_delay(id->dev, CNDS_I2C_PM_TIMEOUT);  in cdns_i2c_probe()
933 	pm_runtime_use_autosuspend(id->dev);  in cdns_i2c_probe()
934 	pm_runtime_set_active(id->dev);  in cdns_i2c_probe()
936 	id->clk_rate_change_nb.notifier_call = cdns_i2c_clk_notifier_cb;  in cdns_i2c_probe()
937 	if (clk_notifier_register(id->clk, &id->clk_rate_change_nb))  in cdns_i2c_probe()
939 	id->input_clk = clk_get_rate(id->clk);  in cdns_i2c_probe()
942 			&id->i2c_clk);  in cdns_i2c_probe()
943 	if (ret || (id->i2c_clk > CDNS_I2C_SPEED_MAX))  in cdns_i2c_probe()
944 		id->i2c_clk = CDNS_I2C_SPEED_DEFAULT;  in cdns_i2c_probe()
949 	ret = cdns_i2c_setclk(id->input_clk, id);  in cdns_i2c_probe()
951 		dev_err(&pdev->dev, "invalid SCL clock: %u Hz\n", id->i2c_clk);  in cdns_i2c_probe()
956 	ret = devm_request_irq(&pdev->dev, id->irq, cdns_i2c_isr, 0,  in cdns_i2c_probe()
957 				 DRIVER_NAME, id);  in cdns_i2c_probe()
959 		dev_err(&pdev->dev, "cannot get irq %d\n", id->irq);  in cdns_i2c_probe()
972 	ret = i2c_add_adapter(&id->adap);  in cdns_i2c_probe()
977 		 id->i2c_clk / 1000, (unsigned long)r_mem->start, id->irq);  in cdns_i2c_probe()
982 	clk_disable_unprepare(id->clk);  in cdns_i2c_probe()
998 	struct cdns_i2c *id = platform_get_drvdata(pdev);  in cdns_i2c_remove()  local
1000 	i2c_del_adapter(&id->adap);  in cdns_i2c_remove()
1001 	clk_notifier_unregister(id->clk, &id->clk_rate_change_nb);  in cdns_i2c_remove()
1002 	clk_disable_unprepare(id->clk);  in cdns_i2c_remove()