ARM: dts: add 'dr_mode' property to hsotg devices for exynos boards
[linux/fpc-iii.git] / drivers / net / phy / mdio-moxart.c
blobf1fc51f655d9e9ec9cd580dd15b6ef8101d293ba
1 /* MOXA ART Ethernet (RTL8201CP) MDIO interface driver
3 * Copyright (C) 2013 Jonas Jensen <jonas.jensen@gmail.com>
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 */
10 #include <linux/delay.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/mutex.h>
14 #include <linux/of_address.h>
15 #include <linux/of_mdio.h>
16 #include <linux/phy.h>
17 #include <linux/platform_device.h>
18 #include <linux/regulator/consumer.h>
20 #define REG_PHY_CTRL 0
21 #define REG_PHY_WRITE_DATA 4
23 /* REG_PHY_CTRL */
24 #define MIIWR BIT(27) /* init write sequence (auto cleared)*/
25 #define MIIRD BIT(26)
26 #define REGAD_MASK 0x3e00000
27 #define PHYAD_MASK 0x1f0000
28 #define MIIRDATA_MASK 0xffff
30 /* REG_PHY_WRITE_DATA */
31 #define MIIWDATA_MASK 0xffff
33 struct moxart_mdio_data {
34 void __iomem *base;
37 static int moxart_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
39 struct moxart_mdio_data *data = bus->priv;
40 u32 ctrl = 0;
41 unsigned int count = 5;
43 dev_dbg(&bus->dev, "%s\n", __func__);
45 ctrl |= MIIRD | ((mii_id << 16) & PHYAD_MASK) |
46 ((regnum << 21) & REGAD_MASK);
48 writel(ctrl, data->base + REG_PHY_CTRL);
50 do {
51 ctrl = readl(data->base + REG_PHY_CTRL);
53 if (!(ctrl & MIIRD))
54 return ctrl & MIIRDATA_MASK;
56 mdelay(10);
57 count--;
58 } while (count > 0);
60 dev_dbg(&bus->dev, "%s timed out\n", __func__);
62 return -ETIMEDOUT;
65 static int moxart_mdio_write(struct mii_bus *bus, int mii_id,
66 int regnum, u16 value)
68 struct moxart_mdio_data *data = bus->priv;
69 u32 ctrl = 0;
70 unsigned int count = 5;
72 dev_dbg(&bus->dev, "%s\n", __func__);
74 ctrl |= MIIWR | ((mii_id << 16) & PHYAD_MASK) |
75 ((regnum << 21) & REGAD_MASK);
77 value &= MIIWDATA_MASK;
79 writel(value, data->base + REG_PHY_WRITE_DATA);
80 writel(ctrl, data->base + REG_PHY_CTRL);
82 do {
83 ctrl = readl(data->base + REG_PHY_CTRL);
85 if (!(ctrl & MIIWR))
86 return 0;
88 mdelay(10);
89 count--;
90 } while (count > 0);
92 dev_dbg(&bus->dev, "%s timed out\n", __func__);
94 return -ETIMEDOUT;
97 static int moxart_mdio_reset(struct mii_bus *bus)
99 int data, i;
101 for (i = 0; i < PHY_MAX_ADDR; i++) {
102 data = moxart_mdio_read(bus, i, MII_BMCR);
103 if (data < 0)
104 continue;
106 data |= BMCR_RESET;
107 if (moxart_mdio_write(bus, i, MII_BMCR, data) < 0)
108 continue;
111 return 0;
114 static int moxart_mdio_probe(struct platform_device *pdev)
116 struct device_node *np = pdev->dev.of_node;
117 struct mii_bus *bus;
118 struct moxart_mdio_data *data;
119 struct resource *res;
120 int ret, i;
122 bus = mdiobus_alloc_size(sizeof(*data));
123 if (!bus)
124 return -ENOMEM;
126 bus->name = "MOXA ART Ethernet MII";
127 bus->read = &moxart_mdio_read;
128 bus->write = &moxart_mdio_write;
129 bus->reset = &moxart_mdio_reset;
130 snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d-mii", pdev->name, pdev->id);
131 bus->parent = &pdev->dev;
133 bus->irq = devm_kzalloc(&pdev->dev, sizeof(int) * PHY_MAX_ADDR,
134 GFP_KERNEL);
135 if (!bus->irq) {
136 ret = -ENOMEM;
137 goto err_out_free_mdiobus;
140 /* Setting PHY_IGNORE_INTERRUPT here even if it has no effect,
141 * of_mdiobus_register() sets these PHY_POLL.
142 * Ideally, the interrupt from MAC controller could be used to
143 * detect link state changes, not polling, i.e. if there was
144 * a way phy_driver could set PHY_HAS_INTERRUPT but have that
145 * interrupt handled in ethernet drivercode.
147 for (i = 0; i < PHY_MAX_ADDR; i++)
148 bus->irq[i] = PHY_IGNORE_INTERRUPT;
150 data = bus->priv;
151 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
152 data->base = devm_ioremap_resource(&pdev->dev, res);
153 if (IS_ERR(data->base)) {
154 ret = PTR_ERR(data->base);
155 goto err_out_free_mdiobus;
158 ret = of_mdiobus_register(bus, np);
159 if (ret < 0)
160 goto err_out_free_mdiobus;
162 platform_set_drvdata(pdev, bus);
164 return 0;
166 err_out_free_mdiobus:
167 mdiobus_free(bus);
168 return ret;
171 static int moxart_mdio_remove(struct platform_device *pdev)
173 struct mii_bus *bus = platform_get_drvdata(pdev);
175 mdiobus_unregister(bus);
176 mdiobus_free(bus);
178 return 0;
181 static const struct of_device_id moxart_mdio_dt_ids[] = {
182 { .compatible = "moxa,moxart-mdio" },
185 MODULE_DEVICE_TABLE(of, moxart_mdio_dt_ids);
187 static struct platform_driver moxart_mdio_driver = {
188 .probe = moxart_mdio_probe,
189 .remove = moxart_mdio_remove,
190 .driver = {
191 .name = "moxart-mdio",
192 .of_match_table = moxart_mdio_dt_ids,
196 module_platform_driver(moxart_mdio_driver);
198 MODULE_DESCRIPTION("MOXA ART MDIO interface driver");
199 MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
200 MODULE_LICENSE("GPL");