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4bdcb1dd MR |
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> | |
4bdcb1dd MR |
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; | |
2bf420a7 | 42 | unsigned long timeout_jiffies; |
4bdcb1dd MR |
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 */ | |
2bf420a7 | 51 | timeout_jiffies = jiffies + MDIO_TIMEOUT; |
4bdcb1dd | 52 | while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { |
2bf420a7 | 53 | if (time_is_before_jiffies(timeout_jiffies)) |
4bdcb1dd MR |
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; | |
2bf420a7 | 70 | unsigned long timeout_jiffies; |
4bdcb1dd MR |
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 */ | |
2bf420a7 | 78 | timeout_jiffies = jiffies + MDIO_TIMEOUT; |
4bdcb1dd | 79 | while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { |
2bf420a7 | 80 | if (time_is_before_jiffies(timeout_jiffies)) |
4bdcb1dd MR |
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 | ||
4bdcb1dd MR |
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; | |
03536cc3 | 98 | struct resource *res; |
e7f4dc35 | 99 | int ret; |
4bdcb1dd MR |
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; | |
4bdcb1dd MR |
108 | snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev)); |
109 | bus->parent = &pdev->dev; | |
110 | ||
4bdcb1dd | 111 | data = bus->priv; |
03536cc3 JZ |
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; | |
4bdcb1dd MR |
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"); | |
227f33be | 125 | data->regulator = NULL; |
4bdcb1dd MR |
126 | } else { |
127 | ret = regulator_enable(data->regulator); | |
128 | if (ret) | |
03536cc3 | 129 | goto err_out_free_mdiobus; |
4bdcb1dd MR |
130 | } |
131 | ||
132 | ret = of_mdiobus_register(bus, np); | |
133 | if (ret < 0) | |
134 | goto err_out_disable_regulator; | |
135 | ||
136 | platform_set_drvdata(pdev, bus); | |
137 | ||
138 | return 0; | |
139 | ||
140 | err_out_disable_regulator: | |
227f33be DC |
141 | if (data->regulator) |
142 | regulator_disable(data->regulator); | |
4bdcb1dd MR |
143 | err_out_free_mdiobus: |
144 | mdiobus_free(bus); | |
145 | return ret; | |
146 | } | |
147 | ||
148 | static int sun4i_mdio_remove(struct platform_device *pdev) | |
149 | { | |
150 | struct mii_bus *bus = platform_get_drvdata(pdev); | |
151 | ||
152 | mdiobus_unregister(bus); | |
4bdcb1dd MR |
153 | mdiobus_free(bus); |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | static const struct of_device_id sun4i_mdio_dt_ids[] = { | |
efe20570 MR |
159 | { .compatible = "allwinner,sun4i-a10-mdio" }, |
160 | ||
161 | /* Deprecated */ | |
4bdcb1dd MR |
162 | { .compatible = "allwinner,sun4i-mdio" }, |
163 | { } | |
164 | }; | |
165 | MODULE_DEVICE_TABLE(of, sun4i_mdio_dt_ids); | |
166 | ||
167 | static struct platform_driver sun4i_mdio_driver = { | |
168 | .probe = sun4i_mdio_probe, | |
169 | .remove = sun4i_mdio_remove, | |
170 | .driver = { | |
171 | .name = "sun4i-mdio", | |
172 | .of_match_table = sun4i_mdio_dt_ids, | |
173 | }, | |
174 | }; | |
175 | ||
176 | module_platform_driver(sun4i_mdio_driver); | |
177 | ||
178 | MODULE_DESCRIPTION("Allwinner EMAC MDIO interface driver"); | |
179 | MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); | |
180 | MODULE_LICENSE("GPL"); |