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1 | /* MOXA ART Ethernet (RTL8201CP) MDIO interface driver |
2 | * | |
3 | * Copyright (C) 2013 Jonas Jensen <jonas.jensen@gmail.com> | |
4 | * | |
5 | * This file is licensed under the terms of the GNU General Public | |
6 | * License version 2. This program is licensed "as is" without any | |
7 | * warranty of any kind, whether express or implied. | |
8 | */ | |
9 | ||
10 | #include <linux/delay.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/mutex.h> | |
15 | #include <linux/of_address.h> | |
16 | #include <linux/of_mdio.h> | |
17 | #include <linux/phy.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/regulator/consumer.h> | |
20 | ||
21 | #define REG_PHY_CTRL 0 | |
22 | #define REG_PHY_WRITE_DATA 4 | |
23 | ||
24 | /* REG_PHY_CTRL */ | |
25 | #define MIIWR BIT(27) /* init write sequence (auto cleared)*/ | |
26 | #define MIIRD BIT(26) | |
27 | #define REGAD_MASK 0x3e00000 | |
28 | #define PHYAD_MASK 0x1f0000 | |
29 | #define MIIRDATA_MASK 0xffff | |
30 | ||
31 | /* REG_PHY_WRITE_DATA */ | |
32 | #define MIIWDATA_MASK 0xffff | |
33 | ||
34 | struct moxart_mdio_data { | |
35 | void __iomem *base; | |
36 | }; | |
37 | ||
38 | static int moxart_mdio_read(struct mii_bus *bus, int mii_id, int regnum) | |
39 | { | |
40 | struct moxart_mdio_data *data = bus->priv; | |
41 | u32 ctrl = 0; | |
42 | unsigned int count = 5; | |
43 | ||
44 | dev_dbg(&bus->dev, "%s\n", __func__); | |
45 | ||
46 | ctrl |= MIIRD | ((mii_id << 16) & PHYAD_MASK) | | |
47 | ((regnum << 21) & REGAD_MASK); | |
48 | ||
49 | writel(ctrl, data->base + REG_PHY_CTRL); | |
50 | ||
51 | do { | |
52 | ctrl = readl(data->base + REG_PHY_CTRL); | |
53 | ||
54 | if (!(ctrl & MIIRD)) | |
55 | return ctrl & MIIRDATA_MASK; | |
56 | ||
57 | mdelay(10); | |
58 | count--; | |
59 | } while (count > 0); | |
60 | ||
61 | dev_dbg(&bus->dev, "%s timed out\n", __func__); | |
62 | ||
63 | return -ETIMEDOUT; | |
64 | } | |
65 | ||
66 | static int moxart_mdio_write(struct mii_bus *bus, int mii_id, | |
67 | int regnum, u16 value) | |
68 | { | |
69 | struct moxart_mdio_data *data = bus->priv; | |
70 | u32 ctrl = 0; | |
71 | unsigned int count = 5; | |
72 | ||
73 | dev_dbg(&bus->dev, "%s\n", __func__); | |
74 | ||
75 | ctrl |= MIIWR | ((mii_id << 16) & PHYAD_MASK) | | |
76 | ((regnum << 21) & REGAD_MASK); | |
77 | ||
78 | value &= MIIWDATA_MASK; | |
79 | ||
80 | writel(value, data->base + REG_PHY_WRITE_DATA); | |
81 | writel(ctrl, data->base + REG_PHY_CTRL); | |
82 | ||
83 | do { | |
84 | ctrl = readl(data->base + REG_PHY_CTRL); | |
85 | ||
86 | if (!(ctrl & MIIWR)) | |
87 | return 0; | |
88 | ||
89 | mdelay(10); | |
90 | count--; | |
91 | } while (count > 0); | |
92 | ||
93 | dev_dbg(&bus->dev, "%s timed out\n", __func__); | |
94 | ||
95 | return -ETIMEDOUT; | |
96 | } | |
97 | ||
98 | static int moxart_mdio_reset(struct mii_bus *bus) | |
99 | { | |
100 | int data, i; | |
101 | ||
102 | for (i = 0; i < PHY_MAX_ADDR; i++) { | |
103 | data = moxart_mdio_read(bus, i, MII_BMCR); | |
104 | if (data < 0) | |
105 | continue; | |
106 | ||
107 | data |= BMCR_RESET; | |
108 | if (moxart_mdio_write(bus, i, MII_BMCR, data) < 0) | |
109 | continue; | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static int moxart_mdio_probe(struct platform_device *pdev) | |
116 | { | |
117 | struct device_node *np = pdev->dev.of_node; | |
118 | struct mii_bus *bus; | |
119 | struct moxart_mdio_data *data; | |
120 | struct resource *res; | |
121 | int ret, i; | |
122 | ||
123 | bus = mdiobus_alloc_size(sizeof(*data)); | |
124 | if (!bus) | |
125 | return -ENOMEM; | |
126 | ||
127 | bus->name = "MOXA ART Ethernet MII"; | |
128 | bus->read = &moxart_mdio_read; | |
129 | bus->write = &moxart_mdio_write; | |
130 | bus->reset = &moxart_mdio_reset; | |
131 | snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d-mii", pdev->name, pdev->id); | |
132 | bus->parent = &pdev->dev; | |
133 | ||
134 | bus->irq = devm_kzalloc(&pdev->dev, sizeof(int) * PHY_MAX_ADDR, | |
135 | GFP_KERNEL); | |
136 | if (!bus->irq) { | |
137 | ret = -ENOMEM; | |
138 | goto err_out_free_mdiobus; | |
139 | } | |
140 | ||
141 | /* Setting PHY_IGNORE_INTERRUPT here even if it has no effect, | |
142 | * of_mdiobus_register() sets these PHY_POLL. | |
143 | * Ideally, the interrupt from MAC controller could be used to | |
144 | * detect link state changes, not polling, i.e. if there was | |
145 | * a way phy_driver could set PHY_HAS_INTERRUPT but have that | |
146 | * interrupt handled in ethernet drivercode. | |
147 | */ | |
148 | for (i = 0; i < PHY_MAX_ADDR; i++) | |
149 | bus->irq[i] = PHY_IGNORE_INTERRUPT; | |
150 | ||
151 | data = bus->priv; | |
152 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
153 | data->base = devm_ioremap_resource(&pdev->dev, res); | |
154 | if (IS_ERR(data->base)) { | |
155 | ret = PTR_ERR(data->base); | |
156 | goto err_out_free_mdiobus; | |
157 | } | |
158 | ||
159 | ret = of_mdiobus_register(bus, np); | |
160 | if (ret < 0) | |
161 | goto err_out_free_mdiobus; | |
162 | ||
163 | platform_set_drvdata(pdev, bus); | |
164 | ||
165 | return 0; | |
166 | ||
167 | err_out_free_mdiobus: | |
168 | mdiobus_free(bus); | |
169 | return ret; | |
170 | } | |
171 | ||
172 | static int moxart_mdio_remove(struct platform_device *pdev) | |
173 | { | |
174 | struct mii_bus *bus = platform_get_drvdata(pdev); | |
175 | ||
176 | mdiobus_unregister(bus); | |
177 | mdiobus_free(bus); | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | static const struct of_device_id moxart_mdio_dt_ids[] = { | |
183 | { .compatible = "moxa,moxart-mdio" }, | |
184 | { } | |
185 | }; | |
186 | MODULE_DEVICE_TABLE(of, moxart_mdio_dt_ids); | |
187 | ||
188 | static struct platform_driver moxart_mdio_driver = { | |
189 | .probe = moxart_mdio_probe, | |
190 | .remove = moxart_mdio_remove, | |
191 | .driver = { | |
192 | .name = "moxart-mdio", | |
193 | .of_match_table = moxart_mdio_dt_ids, | |
194 | }, | |
195 | }; | |
196 | ||
197 | module_platform_driver(moxart_mdio_driver); | |
198 | ||
199 | MODULE_DESCRIPTION("MOXA ART MDIO interface driver"); | |
200 | MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>"); | |
201 | MODULE_LICENSE("GPL"); |