1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) 2014-2015 Hisilicon Limited.
6 #include <linux/acpi.h>
7 #include <linux/errno.h>
8 #include <linux/etherdevice.h>
9 #include <linux/init.h>
10 #include <linux/kernel.h>
11 #include <linux/mfd/syscon.h>
12 #include <linux/module.h>
13 #include <linux/mutex.h>
14 #include <linux/netdevice.h>
15 #include <linux/of_address.h>
17 #include <linux/of_mdio.h>
18 #include <linux/of_platform.h>
19 #include <linux/phy.h>
20 #include <linux/platform_device.h>
21 #include <linux/regmap.h>
23 #define MDIO_DRV_NAME "Hi-HNS_MDIO"
24 #define MDIO_BUS_NAME "Hisilicon MII Bus"
26 #define MDIO_TIMEOUT 1000000
28 struct hns_mdio_sc_reg {
37 struct hns_mdio_device {
38 u8 __iomem *vbase; /* mdio reg base address */
39 struct regmap *subctrl_vbase;
40 struct hns_mdio_sc_reg sc_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
54 #define MDIO_CMD_PRTAD_S 5
55 #define MDIO_CMD_OP_S 10
56 #define MDIO_CMD_ST_S 12
57 #define MDIO_CMD_START_B 14
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,
75 enum mdio_c22_op_seq {
80 enum mdio_c45_op_seq {
81 MDIO_C45_WRITE_ADDR = 0,
83 MDIO_C45_READ_INCREMENT,
87 /* peri subctrl reg */
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
95 static void mdio_write_reg(u8 __iomem *base, u32 reg, u32 value)
97 writel_relaxed(value, base + reg);
100 #define MDIO_WRITE_REG(a, reg, value) \
101 mdio_write_reg((a)->vbase, (reg), (value))
103 static u32 mdio_read_reg(u8 __iomem *base, u32 reg)
105 return readl_relaxed(base + reg);
108 #define mdio_set_field(origin, mask, shift, val) \
110 (origin) &= (~((mask) << (shift))); \
111 (origin) |= (((val) & (mask)) << (shift)); \
114 #define mdio_get_field(origin, mask, shift) (((origin) >> (shift)) & (mask))
116 static void mdio_set_reg_field(u8 __iomem *base, u32 reg, u32 mask, u32 shift,
119 u32 origin = mdio_read_reg(base, reg);
121 mdio_set_field(origin, mask, shift, val);
122 mdio_write_reg(base, reg, origin);
125 #define MDIO_SET_REG_FIELD(dev, reg, mask, shift, val) \
126 mdio_set_reg_field((dev)->vbase, (reg), (mask), (shift), (val))
128 static u32 mdio_get_reg_field(u8 __iomem *base, u32 reg, u32 mask, u32 shift)
132 origin = mdio_read_reg(base, reg);
133 return mdio_get_field(origin, mask, shift);
136 #define MDIO_GET_REG_FIELD(dev, reg, mask, shift) \
137 mdio_get_reg_field((dev)->vbase, (reg), (mask), (shift))
139 #define MDIO_GET_REG_BIT(dev, reg, bit) \
140 mdio_get_reg_field((dev)->vbase, (reg), 0x1ull, (bit))
142 #define MDIO_CHECK_SET_ST 1
143 #define MDIO_CHECK_CLR_ST 0
145 static int mdio_sc_cfg_reg_write(struct hns_mdio_device *mdio_dev,
146 u32 cfg_reg, u32 set_val,
147 u32 st_reg, u32 st_msk, u8 check_st)
152 regmap_write(mdio_dev->subctrl_vbase, cfg_reg, set_val);
154 for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {
155 regmap_read(mdio_dev->subctrl_vbase, st_reg, ®_value);
157 if ((!!check_st) == (!!reg_value))
161 if ((!!check_st) != (!!reg_value))
167 static int hns_mdio_wait_ready(struct mii_bus *bus)
169 struct hns_mdio_device *mdio_dev = bus->priv;
173 /* waitting for MDIO_COMMAND_REG 's mdio_start==0 */
174 /* after that can do read or write*/
175 for (i = 0; i < MDIO_TIMEOUT; i++) {
176 cmd_reg_value = MDIO_GET_REG_BIT(mdio_dev,
182 if ((i == MDIO_TIMEOUT) && cmd_reg_value)
188 static void hns_mdio_cmd_write(struct hns_mdio_device *mdio_dev,
189 u8 is_c45, u8 op, u8 phy_id, u16 cmd)
192 u8 st = is_c45 ? MDIO_ST_CLAUSE_45 : MDIO_ST_CLAUSE_22;
194 cmd_reg_value = st << MDIO_CMD_ST_S;
195 cmd_reg_value |= op << MDIO_CMD_OP_S;
197 (phy_id & MDIO_CMD_PRTAD_M) << MDIO_CMD_PRTAD_S;
198 cmd_reg_value |= (cmd & MDIO_CMD_DEVAD_M) << MDIO_CMD_DEVAD_S;
199 cmd_reg_value |= 1 << MDIO_CMD_START_B;
201 MDIO_WRITE_REG(mdio_dev, MDIO_COMMAND_REG, cmd_reg_value);
205 * hns_mdio_write - access phy register
208 * @regnum: register num
209 * @value: register value
211 * Return 0 on success, negative on failure
213 static int hns_mdio_write(struct mii_bus *bus,
214 int phy_id, int regnum, u16 data)
217 struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
218 u8 devad = ((regnum >> 16) & 0x1f);
219 u8 is_c45 = !!(regnum & MII_ADDR_C45);
220 u16 reg = (u16)(regnum & 0xffff);
224 dev_dbg(&bus->dev, "mdio write %s,base is %p\n",
225 bus->id, mdio_dev->vbase);
226 dev_dbg(&bus->dev, "phy id=%d, is_c45=%d, devad=%d, reg=%#x, write data=%d\n",
227 phy_id, is_c45, devad, reg, data);
230 ret = hns_mdio_wait_ready(bus);
232 dev_err(&bus->dev, "MDIO bus is busy\n");
240 /* config the cmd-reg to write addr*/
241 MDIO_SET_REG_FIELD(mdio_dev, MDIO_ADDR_REG, MDIO_ADDR_DATA_M,
242 MDIO_ADDR_DATA_S, reg);
244 hns_mdio_cmd_write(mdio_dev, is_c45,
245 MDIO_C45_WRITE_ADDR, phy_id, devad);
247 /* check for read or write opt is finished */
248 ret = hns_mdio_wait_ready(bus);
250 dev_err(&bus->dev, "MDIO bus is busy\n");
254 /* config the data needed writing */
256 op = MDIO_C45_WRITE_DATA;
259 MDIO_SET_REG_FIELD(mdio_dev, MDIO_WDATA_REG, MDIO_WDATA_DATA_M,
260 MDIO_WDATA_DATA_S, data);
262 hns_mdio_cmd_write(mdio_dev, is_c45, op, phy_id, cmd_reg_cfg);
268 * hns_mdio_read - access phy register
271 * @regnum: register num
272 * @value: register value
274 * Return phy register value
276 static int hns_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
280 u8 devad = ((regnum >> 16) & 0x1f);
281 u8 is_c45 = !!(regnum & MII_ADDR_C45);
282 u16 reg = (u16)(regnum & 0xffff);
283 struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
285 dev_dbg(&bus->dev, "mdio read %s,base is %p\n",
286 bus->id, mdio_dev->vbase);
287 dev_dbg(&bus->dev, "phy id=%d, is_c45=%d, devad=%d, reg=%#x!\n",
288 phy_id, is_c45, devad, reg);
290 /* Step 1: wait for ready */
291 ret = hns_mdio_wait_ready(bus);
293 dev_err(&bus->dev, "MDIO bus is busy\n");
298 hns_mdio_cmd_write(mdio_dev, is_c45,
299 MDIO_C22_READ, phy_id, reg);
301 MDIO_SET_REG_FIELD(mdio_dev, MDIO_ADDR_REG, MDIO_ADDR_DATA_M,
302 MDIO_ADDR_DATA_S, reg);
304 /* Step 2; config the cmd-reg to write addr*/
305 hns_mdio_cmd_write(mdio_dev, is_c45,
306 MDIO_C45_WRITE_ADDR, phy_id, devad);
308 /* Step 3: check for read or write opt is finished */
309 ret = hns_mdio_wait_ready(bus);
311 dev_err(&bus->dev, "MDIO bus is busy\n");
315 hns_mdio_cmd_write(mdio_dev, is_c45,
316 MDIO_C45_READ, phy_id, devad);
319 /* Step 5: waitting for MDIO_COMMAND_REG 's mdio_start==0,*/
320 /* check for read or write opt is finished */
321 ret = hns_mdio_wait_ready(bus);
323 dev_err(&bus->dev, "MDIO bus is busy\n");
327 reg_val = MDIO_GET_REG_BIT(mdio_dev, MDIO_STA_REG, MDIO_STATE_STA_B);
329 dev_err(&bus->dev, " ERROR! MDIO Read failed!\n");
333 /* Step 6; get out data*/
334 reg_val = (u16)MDIO_GET_REG_FIELD(mdio_dev, MDIO_RDATA_REG,
335 MDIO_RDATA_DATA_M, MDIO_RDATA_DATA_S);
341 * hns_mdio_reset - reset mdio bus
344 * Return 0 on success, negative on failure
346 static int hns_mdio_reset(struct mii_bus *bus)
348 struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
349 const struct hns_mdio_sc_reg *sc_reg;
352 if (dev_of_node(bus->parent)) {
353 if (!mdio_dev->subctrl_vbase) {
354 dev_err(&bus->dev, "mdio sys ctl reg has not maped\n");
358 sc_reg = &mdio_dev->sc_reg;
359 /* 1. reset req, and read reset st check */
360 ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_reset_req,
361 0x1, sc_reg->mdio_reset_st, 0x1,
364 dev_err(&bus->dev, "MDIO reset fail\n");
368 /* 2. dis clk, and read clk st check */
369 ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_clk_dis,
370 0x1, sc_reg->mdio_clk_st, 0x1,
373 dev_err(&bus->dev, "MDIO dis clk fail\n");
377 /* 3. reset dreq, and read reset st check */
378 ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_reset_dreq,
379 0x1, sc_reg->mdio_reset_st, 0x1,
382 dev_err(&bus->dev, "MDIO dis clk fail\n");
386 /* 4. en clk, and read clk st check */
387 ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_clk_en,
388 0x1, sc_reg->mdio_clk_st, 0x1,
391 dev_err(&bus->dev, "MDIO en clk fail\n");
392 } else if (is_acpi_node(bus->parent->fwnode)) {
395 s = acpi_evaluate_object(ACPI_HANDLE(bus->parent),
397 if (ACPI_FAILURE(s)) {
398 dev_err(&bus->dev, "Reset failed, return:%#x\n", s);
404 dev_err(&bus->dev, "Can not get cfg data from DT or ACPI\n");
411 * hns_mdio_probe - probe mdio device
412 * @pdev: mdio platform device
414 * Return 0 on success, negative on failure
416 static int hns_mdio_probe(struct platform_device *pdev)
418 struct hns_mdio_device *mdio_dev;
419 struct mii_bus *new_bus;
423 dev_err(NULL, "pdev is NULL!\r\n");
427 mdio_dev = devm_kzalloc(&pdev->dev, sizeof(*mdio_dev), GFP_KERNEL);
431 new_bus = devm_mdiobus_alloc(&pdev->dev);
433 dev_err(&pdev->dev, "mdiobus_alloc fail!\n");
437 new_bus->name = MDIO_BUS_NAME;
438 new_bus->read = hns_mdio_read;
439 new_bus->write = hns_mdio_write;
440 new_bus->reset = hns_mdio_reset;
441 new_bus->priv = mdio_dev;
442 new_bus->parent = &pdev->dev;
444 mdio_dev->vbase = devm_platform_ioremap_resource(pdev, 0);
445 if (IS_ERR(mdio_dev->vbase)) {
446 ret = PTR_ERR(mdio_dev->vbase);
450 platform_set_drvdata(pdev, new_bus);
451 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%s-%s", "Mii",
452 dev_name(&pdev->dev));
453 if (dev_of_node(&pdev->dev)) {
454 struct of_phandle_args reg_args;
456 ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
462 mdio_dev->subctrl_vbase =
463 syscon_node_to_regmap(reg_args.np);
464 if (IS_ERR(mdio_dev->subctrl_vbase)) {
465 dev_warn(&pdev->dev, "syscon_node_to_regmap error\n");
466 mdio_dev->subctrl_vbase = NULL;
468 if (reg_args.args_count == 4) {
469 mdio_dev->sc_reg.mdio_clk_en =
470 (u16)reg_args.args[0];
471 mdio_dev->sc_reg.mdio_clk_dis =
472 (u16)reg_args.args[0] + 4;
473 mdio_dev->sc_reg.mdio_reset_req =
474 (u16)reg_args.args[1];
475 mdio_dev->sc_reg.mdio_reset_dreq =
476 (u16)reg_args.args[1] + 4;
477 mdio_dev->sc_reg.mdio_clk_st =
478 (u16)reg_args.args[2];
479 mdio_dev->sc_reg.mdio_reset_st =
480 (u16)reg_args.args[3];
483 mdio_dev->sc_reg.mdio_clk_en =
485 mdio_dev->sc_reg.mdio_clk_dis =
487 mdio_dev->sc_reg.mdio_reset_req =
489 mdio_dev->sc_reg.mdio_reset_dreq =
491 mdio_dev->sc_reg.mdio_clk_st =
493 mdio_dev->sc_reg.mdio_reset_st =
498 dev_warn(&pdev->dev, "find syscon ret = %#x\n", ret);
499 mdio_dev->subctrl_vbase = NULL;
502 ret = of_mdiobus_register(new_bus, pdev->dev.of_node);
503 } else if (is_acpi_node(pdev->dev.fwnode)) {
504 /* Clear all the IRQ properties */
505 memset(new_bus->irq, PHY_POLL, 4 * PHY_MAX_ADDR);
507 /* Mask out all PHYs from auto probing. */
508 new_bus->phy_mask = ~0;
510 /* Register the MDIO bus */
511 ret = mdiobus_register(new_bus);
513 dev_err(&pdev->dev, "Can not get cfg data from DT or ACPI\n");
518 dev_err(&pdev->dev, "Cannot register as MDIO bus!\n");
519 platform_set_drvdata(pdev, NULL);
527 * hns_mdio_remove - remove mdio device
528 * @pdev: mdio platform device
530 * Return 0 on success, negative on failure
532 static int hns_mdio_remove(struct platform_device *pdev)
536 bus = platform_get_drvdata(pdev);
538 mdiobus_unregister(bus);
539 platform_set_drvdata(pdev, NULL);
543 static const struct of_device_id hns_mdio_match[] = {
544 {.compatible = "hisilicon,mdio"},
545 {.compatible = "hisilicon,hns-mdio"},
548 MODULE_DEVICE_TABLE(of, hns_mdio_match);
550 static const struct acpi_device_id hns_mdio_acpi_match[] = {
554 MODULE_DEVICE_TABLE(acpi, hns_mdio_acpi_match);
556 static struct platform_driver hns_mdio_driver = {
557 .probe = hns_mdio_probe,
558 .remove = hns_mdio_remove,
560 .name = MDIO_DRV_NAME,
561 .of_match_table = hns_mdio_match,
562 .acpi_match_table = ACPI_PTR(hns_mdio_acpi_match),
566 module_platform_driver(hns_mdio_driver);
568 MODULE_LICENSE("GPL");
569 MODULE_AUTHOR("Huawei Tech. Co., Ltd.");
570 MODULE_DESCRIPTION("Hisilicon HNS MDIO driver");
571 MODULE_ALIAS("platform:" MDIO_DRV_NAME);