1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Copyright (c) 2014-2015 Hisilicon Limited.
23 #define MDIO_DRV_NAME "Hi-HNS_MDIO"
38 	u8 __iomem *vbase;		/* mdio reg base address */
43 /* mdio reg */
44 #define MDIO_COMMAND_REG		0x0
45 #define MDIO_ADDR_REG			0x4
46 #define MDIO_WDATA_REG			0x8
47 #define MDIO_RDATA_REG			0xc
48 #define MDIO_STA_REG			0x10
51 #define MDIO_CMD_DEVAD_M	0x1f
52 #define MDIO_CMD_DEVAD_S	0
53 #define MDIO_CMD_PRTAD_M	0x1f
59 #define MDIO_ADDR_DATA_M	0xffff
60 #define MDIO_ADDR_DATA_S	0
62 #define MDIO_WDATA_DATA_M	0xffff
63 #define MDIO_WDATA_DATA_S	0
65 #define MDIO_RDATA_DATA_M	0xffff
66 #define MDIO_RDATA_DATA_S	0
68 #define MDIO_STATE_STA_B	0
71 	MDIO_ST_CLAUSE_45 = 0,
81 	MDIO_C45_WRITE_ADDR = 0,
88 #define MDIO_SC_CLK_EN		0x338
89 #define MDIO_SC_CLK_DIS		0x33C
90 #define MDIO_SC_RESET_REQ	0xA38
91 #define MDIO_SC_RESET_DREQ	0xA3C
92 #define MDIO_SC_CLK_ST		0x531C
93 #define MDIO_SC_RESET_ST	0x5A1C
101 	mdio_write_reg((a)->vbase, (reg), (value))
112 	} while (0)
126 	mdio_set_reg_field((dev)->vbase, (reg), (mask), (shift), (val))
137 		mdio_get_reg_field((dev)->vbase, (reg), (mask), (shift))
140 		mdio_get_reg_field((dev)->vbase, (reg), 0x1ull, (bit))
143 #define MDIO_CHECK_CLR_ST	0
153 	regmap_write(mdio_dev->subctrl_vbase, cfg_reg, set_val);  in mdio_sc_cfg_reg_write()
155 	for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {  in mdio_sc_cfg_reg_write()
156 		ret = regmap_read(mdio_dev->subctrl_vbase, st_reg, &reg_value);  in mdio_sc_cfg_reg_write()
166 		return -EBUSY;  in mdio_sc_cfg_reg_write()
168 	return 0;  in mdio_sc_cfg_reg_write()
173 	struct hns_mdio_device *mdio_dev = bus->priv;  in hns_mdio_wait_ready()
177 	/* waiting for MDIO_COMMAND_REG's mdio_start==0 */  in hns_mdio_wait_ready()
179 	for (i = 0; i < MDIO_TIMEOUT; i++) {  in hns_mdio_wait_ready()
187 		return -ETIMEDOUT;  in hns_mdio_wait_ready()
189 	return 0;  in hns_mdio_wait_ready()
209  * hns_mdio_write_c22 - access phy register
210  * @bus: mdio bus
215  * Return 0 on success, negative on failure
220 	struct hns_mdio_device *mdio_dev = bus->priv;  in hns_mdio_write_c22()
221 	u16 reg = (u16)(regnum & 0xffff);  in hns_mdio_write_c22()
226 	dev_dbg(&bus->dev, "mdio write %s,base is %p\n",  in hns_mdio_write_c22()
227 		bus->id, mdio_dev->vbase);  in hns_mdio_write_c22()
228 	dev_dbg(&bus->dev, "phy id=%d, reg=%#x, write data=%d\n",  in hns_mdio_write_c22()
234 		dev_err(&bus->dev, "MDIO bus is busy\n");  in hns_mdio_write_c22()
246 	return 0;  in hns_mdio_write_c22()
250  * hns_mdio_write_c45 - access phy register
251  * @bus: mdio bus
257  * Return 0 on success, negative on failure
262 	struct hns_mdio_device *mdio_dev = bus->priv;  in hns_mdio_write_c45()
263 	u16 reg = (u16)(regnum & 0xffff);  in hns_mdio_write_c45()
268 	dev_dbg(&bus->dev, "mdio write %s,base is %p\n",  in hns_mdio_write_c45()
269 		bus->id, mdio_dev->vbase);  in hns_mdio_write_c45()
270 	dev_dbg(&bus->dev, "phy id=%d, devad=%d, reg=%#x, write data=%d\n",  in hns_mdio_write_c45()
276 		dev_err(&bus->dev, "MDIO bus is busy\n");  in hns_mdio_write_c45()
280 	/* config the cmd-reg to write addr*/  in hns_mdio_write_c45()
289 		dev_err(&bus->dev, "MDIO bus is busy\n");  in hns_mdio_write_c45()
302 	return 0;  in hns_mdio_write_c45()
306  * hns_mdio_read_c22 - access phy register
307  * @bus: mdio bus
315 	struct hns_mdio_device *mdio_dev = bus->priv;  in hns_mdio_read_c22()
316 	u16 reg = (u16)(regnum & 0xffff);  in hns_mdio_read_c22()
320 	dev_dbg(&bus->dev, "mdio read %s,base is %p\n",  in hns_mdio_read_c22()
321 		bus->id, mdio_dev->vbase);  in hns_mdio_read_c22()
322 	dev_dbg(&bus->dev, "phy id=%d, reg=%#x!\n", phy_id, reg);  in hns_mdio_read_c22()
327 		dev_err(&bus->dev, "MDIO bus is busy\n");  in hns_mdio_read_c22()
333 	/* Step 2: waiting for MDIO_COMMAND_REG 's mdio_start==0,*/  in hns_mdio_read_c22()
337 		dev_err(&bus->dev, "MDIO bus is busy\n");  in hns_mdio_read_c22()
343 		dev_err(&bus->dev, " ERROR! MDIO Read failed!\n");  in hns_mdio_read_c22()
344 		return -EBUSY;  in hns_mdio_read_c22()
355  * hns_mdio_read_c45 - access phy register
356  * @bus: mdio bus
366 	struct hns_mdio_device *mdio_dev = bus->priv;  in hns_mdio_read_c45()
367 	u16 reg = (u16)(regnum & 0xffff);  in hns_mdio_read_c45()
371 	dev_dbg(&bus->dev, "mdio read %s,base is %p\n",  in hns_mdio_read_c45()
372 		bus->id, mdio_dev->vbase);  in hns_mdio_read_c45()
373 	dev_dbg(&bus->dev, "phy id=%d, devad=%d, reg=%#x!\n",  in hns_mdio_read_c45()
379 		dev_err(&bus->dev, "MDIO bus is busy\n");  in hns_mdio_read_c45()
386 	/* Step 2; config the cmd-reg to write addr*/  in hns_mdio_read_c45()
392 		dev_err(&bus->dev, "MDIO bus is busy\n");  in hns_mdio_read_c45()
398 	/* Step 5: waiting for MDIO_COMMAND_REG 's mdio_start==0,*/  in hns_mdio_read_c45()
402 		dev_err(&bus->dev, "MDIO bus is busy\n");  in hns_mdio_read_c45()
408 		dev_err(&bus->dev, " ERROR! MDIO Read failed!\n");  in hns_mdio_read_c45()
409 		return -EBUSY;  in hns_mdio_read_c45()
420  * hns_mdio_reset - reset mdio bus
421  * @bus: mdio bus
423  * Return 0 on success, negative on failure
427 	struct hns_mdio_device *mdio_dev = bus->priv;  in hns_mdio_reset()
431 	if (dev_of_node(bus->parent)) {  in hns_mdio_reset()
432 		if (!mdio_dev->subctrl_vbase) {  in hns_mdio_reset()
433 			dev_err(&bus->dev, "mdio sys ctl reg has not mapped\n");  in hns_mdio_reset()
434 			return -ENODEV;  in hns_mdio_reset()
437 		sc_reg = &mdio_dev->sc_reg;  in hns_mdio_reset()
439 		ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_reset_req,  in hns_mdio_reset()
440 					    0x1, sc_reg->mdio_reset_st, 0x1,  in hns_mdio_reset()
443 			dev_err(&bus->dev, "MDIO reset fail\n");  in hns_mdio_reset()
448 		ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_clk_dis,  in hns_mdio_reset()
449 					    0x1, sc_reg->mdio_clk_st, 0x1,  in hns_mdio_reset()
452 			dev_err(&bus->dev, "MDIO dis clk fail\n");  in hns_mdio_reset()
457 		ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_reset_dreq,  in hns_mdio_reset()
458 					    0x1, sc_reg->mdio_reset_st, 0x1,  in hns_mdio_reset()
461 			dev_err(&bus->dev, "MDIO dis clk fail\n");  in hns_mdio_reset()
466 		ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_clk_en,  in hns_mdio_reset()
467 					    0x1, sc_reg->mdio_clk_st, 0x1,  in hns_mdio_reset()
470 			dev_err(&bus->dev, "MDIO en clk fail\n");  in hns_mdio_reset()
471 	} else if (is_acpi_node(bus->parent->fwnode)) {  in hns_mdio_reset()
474 		s = acpi_evaluate_object(ACPI_HANDLE(bus->parent),  in hns_mdio_reset()
477 			dev_err(&bus->dev, "Reset failed, return:%#x\n", s);  in hns_mdio_reset()
478 			ret = -EBUSY;  in hns_mdio_reset()
480 			ret = 0;  in hns_mdio_reset()
483 		dev_err(&bus->dev, "Can not get cfg data from DT or ACPI\n");  in hns_mdio_reset()
484 		ret = -ENXIO;  in hns_mdio_reset()
490  * hns_mdio_probe - probe mdio device
491  * @pdev: mdio platform device
493  * Return 0 on success, negative on failure
503 		return -ENODEV;  in hns_mdio_probe()
506 	mdio_dev = devm_kzalloc(&pdev->dev, sizeof(*mdio_dev), GFP_KERNEL);  in hns_mdio_probe()
508 		return -ENOMEM;  in hns_mdio_probe()
510 	new_bus = devm_mdiobus_alloc(&pdev->dev);  in hns_mdio_probe()
512 		dev_err(&pdev->dev, "mdiobus_alloc fail!\n");  in hns_mdio_probe()
513 		return -ENOMEM;  in hns_mdio_probe()
516 	new_bus->name = MDIO_BUS_NAME;  in hns_mdio_probe()
517 	new_bus->read = hns_mdio_read_c22;  in hns_mdio_probe()
518 	new_bus->write = hns_mdio_write_c22;  in hns_mdio_probe()
519 	new_bus->read_c45 = hns_mdio_read_c45;  in hns_mdio_probe()
520 	new_bus->write_c45 = hns_mdio_write_c45;  in hns_mdio_probe()
521 	new_bus->reset = hns_mdio_reset;  in hns_mdio_probe()
522 	new_bus->priv = mdio_dev;  in hns_mdio_probe()
523 	new_bus->parent = &pdev->dev;  in hns_mdio_probe()
525 	mdio_dev->vbase = devm_platform_ioremap_resource(pdev, 0);  in hns_mdio_probe()
526 	if (IS_ERR(mdio_dev->vbase)) {  in hns_mdio_probe()
527 		ret = PTR_ERR(mdio_dev->vbase);  in hns_mdio_probe()
532 	snprintf(new_bus->id, MII_BUS_ID_SIZE, "%s-%s", "Mii",  in hns_mdio_probe()
533 		 dev_name(&pdev->dev));  in hns_mdio_probe()
534 	if (dev_of_node(&pdev->dev)) {  in hns_mdio_probe()
537 		ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,  in hns_mdio_probe()
538 						       "subctrl-vbase",  in hns_mdio_probe()
540 						       0,  in hns_mdio_probe()
543 			mdio_dev->subctrl_vbase =  in hns_mdio_probe()
545 			if (IS_ERR(mdio_dev->subctrl_vbase)) {  in hns_mdio_probe()
546 				dev_warn(&pdev->dev, "syscon_node_to_regmap error\n");  in hns_mdio_probe()
547 				mdio_dev->subctrl_vbase = NULL;  in hns_mdio_probe()
550 					mdio_dev->sc_reg.mdio_clk_en =  in hns_mdio_probe()
551 						(u16)reg_args.args[0];  in hns_mdio_probe()
552 					mdio_dev->sc_reg.mdio_clk_dis =  in hns_mdio_probe()
553 						(u16)reg_args.args[0] + 4;  in hns_mdio_probe()
554 					mdio_dev->sc_reg.mdio_reset_req =  in hns_mdio_probe()
556 					mdio_dev->sc_reg.mdio_reset_dreq =  in hns_mdio_probe()
558 					mdio_dev->sc_reg.mdio_clk_st =  in hns_mdio_probe()
560 					mdio_dev->sc_reg.mdio_reset_st =  in hns_mdio_probe()
564 					mdio_dev->sc_reg.mdio_clk_en =  in hns_mdio_probe()
566 					mdio_dev->sc_reg.mdio_clk_dis =  in hns_mdio_probe()
568 					mdio_dev->sc_reg.mdio_reset_req =  in hns_mdio_probe()
570 					mdio_dev->sc_reg.mdio_reset_dreq =  in hns_mdio_probe()
572 					mdio_dev->sc_reg.mdio_clk_st =  in hns_mdio_probe()
574 					mdio_dev->sc_reg.mdio_reset_st =  in hns_mdio_probe()
580 			dev_warn(&pdev->dev, "find syscon ret = %#x\n", ret);  in hns_mdio_probe()
581 			mdio_dev->subctrl_vbase = NULL;  in hns_mdio_probe()
584 		ret = of_mdiobus_register(new_bus, pdev->dev.of_node);  in hns_mdio_probe()
585 	} else if (is_acpi_node(pdev->dev.fwnode)) {  in hns_mdio_probe()
587 		memset(new_bus->irq, PHY_POLL, 4 * PHY_MAX_ADDR);  in hns_mdio_probe()
590 		new_bus->phy_mask = ~0;  in hns_mdio_probe()
592 		/* Register the MDIO bus */  in hns_mdio_probe()
595 		dev_err(&pdev->dev, "Can not get cfg data from DT or ACPI\n");  in hns_mdio_probe()
596 		ret = -ENXIO;  in hns_mdio_probe()
600 		dev_err(&pdev->dev, "Cannot register as MDIO bus!\n");  in hns_mdio_probe()
605 	return 0;  in hns_mdio_probe()
609  * hns_mdio_remove - remove mdio device
610  * @pdev: mdio platform device
612  * Return 0 on success, negative on failure
625 	{.compatible = "hisilicon,mdio"},
626 	{.compatible = "hisilicon,hns-mdio"},
632 	{ "HISI0141", 0 },
651 MODULE_DESCRIPTION("Hisilicon HNS MDIO driver");