diff options
Diffstat (limited to 'drivers/net/phy/mdio-moxart.c')
-rw-r--r-- | drivers/net/phy/mdio-moxart.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/drivers/net/phy/mdio-moxart.c b/drivers/net/phy/mdio-moxart.c new file mode 100644 index 000000000000..a5741cb0304e --- /dev/null +++ b/drivers/net/phy/mdio-moxart.c | |||
@@ -0,0 +1,201 @@ | |||
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"); | ||