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Linux/drivers/net/phy/mdio-sun4i.c

  1 /*
  2  * Allwinner EMAC MDIO interface driver
  3  *
  4  * Copyright 2012-2013 Stefan Roese <sr@denx.de>
  5  * Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
  6  *
  7  * Based on the Linux driver provided by Allwinner:
  8  * Copyright (C) 1997  Sten Wang
  9  *
 10  * This file is licensed under the terms of the GNU General Public
 11  * License version 2. This program is licensed "as is" without any
 12  * warranty of any kind, whether express or implied.
 13  */
 14 
 15 #include <linux/delay.h>
 16 #include <linux/kernel.h>
 17 #include <linux/module.h>
 18 #include <linux/mutex.h>
 19 #include <linux/of_address.h>
 20 #include <linux/of_mdio.h>
 21 #include <linux/phy.h>
 22 #include <linux/platform_device.h>
 23 #include <linux/regulator/consumer.h>
 24 
 25 #define EMAC_MAC_MCMD_REG       (0x00)
 26 #define EMAC_MAC_MADR_REG       (0x04)
 27 #define EMAC_MAC_MWTD_REG       (0x08)
 28 #define EMAC_MAC_MRDD_REG       (0x0c)
 29 #define EMAC_MAC_MIND_REG       (0x10)
 30 #define EMAC_MAC_SSRR_REG       (0x14)
 31 
 32 #define MDIO_TIMEOUT            (msecs_to_jiffies(100))
 33 
 34 struct sun4i_mdio_data {
 35         void __iomem            *membase;
 36         struct regulator        *regulator;
 37 };
 38 
 39 static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
 40 {
 41         struct sun4i_mdio_data *data = bus->priv;
 42         unsigned long timeout_jiffies;
 43         int value;
 44 
 45         /* issue the phy address and reg */
 46         writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);
 47         /* pull up the phy io line */
 48         writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
 49 
 50         /* Wait read complete */
 51         timeout_jiffies = jiffies + MDIO_TIMEOUT;
 52         while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
 53                 if (time_is_before_jiffies(timeout_jiffies))
 54                         return -ETIMEDOUT;
 55                 msleep(1);
 56         }
 57 
 58         /* push down the phy io line */
 59         writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
 60         /* and read data */
 61         value = readl(data->membase + EMAC_MAC_MRDD_REG);
 62 
 63         return value;
 64 }
 65 
 66 static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
 67                             u16 value)
 68 {
 69         struct sun4i_mdio_data *data = bus->priv;
 70         unsigned long timeout_jiffies;
 71 
 72         /* issue the phy address and reg */
 73         writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);
 74         /* pull up the phy io line */
 75         writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
 76 
 77         /* Wait read complete */
 78         timeout_jiffies = jiffies + MDIO_TIMEOUT;
 79         while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
 80                 if (time_is_before_jiffies(timeout_jiffies))
 81                         return -ETIMEDOUT;
 82                 msleep(1);
 83         }
 84 
 85         /* push down the phy io line */
 86         writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
 87         /* and write data */
 88         writel(value, data->membase + EMAC_MAC_MWTD_REG);
 89 
 90         return 0;
 91 }
 92 
 93 static int sun4i_mdio_probe(struct platform_device *pdev)
 94 {
 95         struct device_node *np = pdev->dev.of_node;
 96         struct mii_bus *bus;
 97         struct sun4i_mdio_data *data;
 98         struct resource *res;
 99         int ret;
100 
101         bus = mdiobus_alloc_size(sizeof(*data));
102         if (!bus)
103                 return -ENOMEM;
104 
105         bus->name = "sun4i_mii_bus";
106         bus->read = &sun4i_mdio_read;
107         bus->write = &sun4i_mdio_write;
108         snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
109         bus->parent = &pdev->dev;
110 
111         data = bus->priv;
112         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
113         data->membase = devm_ioremap_resource(&pdev->dev, res);
114         if (IS_ERR(data->membase)) {
115                 ret = PTR_ERR(data->membase);
116                 goto err_out_free_mdiobus;
117         }
118 
119         data->regulator = devm_regulator_get(&pdev->dev, "phy");
120         if (IS_ERR(data->regulator)) {
121                 if (PTR_ERR(data->regulator) == -EPROBE_DEFER)
122                         return -EPROBE_DEFER;
123 
124                 dev_info(&pdev->dev, "no regulator found\n");
125         } else {
126                 ret = regulator_enable(data->regulator);
127                 if (ret)
128                         goto err_out_free_mdiobus;
129         }
130 
131         ret = of_mdiobus_register(bus, np);
132         if (ret < 0)
133                 goto err_out_disable_regulator;
134 
135         platform_set_drvdata(pdev, bus);
136 
137         return 0;
138 
139 err_out_disable_regulator:
140         regulator_disable(data->regulator);
141 err_out_free_mdiobus:
142         mdiobus_free(bus);
143         return ret;
144 }
145 
146 static int sun4i_mdio_remove(struct platform_device *pdev)
147 {
148         struct mii_bus *bus = platform_get_drvdata(pdev);
149 
150         mdiobus_unregister(bus);
151         mdiobus_free(bus);
152 
153         return 0;
154 }
155 
156 static const struct of_device_id sun4i_mdio_dt_ids[] = {
157         { .compatible = "allwinner,sun4i-a10-mdio" },
158 
159         /* Deprecated */
160         { .compatible = "allwinner,sun4i-mdio" },
161         { }
162 };
163 MODULE_DEVICE_TABLE(of, sun4i_mdio_dt_ids);
164 
165 static struct platform_driver sun4i_mdio_driver = {
166         .probe = sun4i_mdio_probe,
167         .remove = sun4i_mdio_remove,
168         .driver = {
169                 .name = "sun4i-mdio",
170                 .of_match_table = sun4i_mdio_dt_ids,
171         },
172 };
173 
174 module_platform_driver(sun4i_mdio_driver);
175 
176 MODULE_DESCRIPTION("Allwinner EMAC MDIO interface driver");
177 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
178 MODULE_LICENSE("GPL");
179 

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