Andrew Lunn | 5f85757 | 2019-01-21 19:10:19 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Allwinner EMAC MDIO interface driver |
| 4 | * |
| 5 | * Copyright 2012-2013 Stefan Roese <sr@denx.de> |
| 6 | * Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com> |
| 7 | * |
| 8 | * Based on the Linux driver provided by Allwinner: |
| 9 | * Copyright (C) 1997 Sten Wang |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #include <linux/delay.h> |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/mutex.h> |
| 16 | #include <linux/of_address.h> |
| 17 | #include <linux/of_mdio.h> |
| 18 | #include <linux/phy.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/regulator/consumer.h> |
| 21 | |
| 22 | #define EMAC_MAC_MCMD_REG (0x00) |
| 23 | #define EMAC_MAC_MADR_REG (0x04) |
| 24 | #define EMAC_MAC_MWTD_REG (0x08) |
| 25 | #define EMAC_MAC_MRDD_REG (0x0c) |
| 26 | #define EMAC_MAC_MIND_REG (0x10) |
| 27 | #define EMAC_MAC_SSRR_REG (0x14) |
| 28 | |
| 29 | #define MDIO_TIMEOUT (msecs_to_jiffies(100)) |
| 30 | |
| 31 | struct sun4i_mdio_data { |
| 32 | void __iomem *membase; |
| 33 | struct regulator *regulator; |
| 34 | }; |
| 35 | |
| 36 | static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum) |
| 37 | { |
| 38 | struct sun4i_mdio_data *data = bus->priv; |
Emilio López | 2bf420a | 2013-07-22 22:09:18 -0300 | [diff] [blame] | 39 | unsigned long timeout_jiffies; |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 40 | int value; |
| 41 | |
| 42 | /* issue the phy address and reg */ |
| 43 | writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG); |
| 44 | /* pull up the phy io line */ |
| 45 | writel(0x1, data->membase + EMAC_MAC_MCMD_REG); |
| 46 | |
| 47 | /* Wait read complete */ |
Emilio López | 2bf420a | 2013-07-22 22:09:18 -0300 | [diff] [blame] | 48 | timeout_jiffies = jiffies + MDIO_TIMEOUT; |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 49 | while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { |
Emilio López | 2bf420a | 2013-07-22 22:09:18 -0300 | [diff] [blame] | 50 | if (time_is_before_jiffies(timeout_jiffies)) |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 51 | return -ETIMEDOUT; |
| 52 | msleep(1); |
| 53 | } |
| 54 | |
| 55 | /* push down the phy io line */ |
| 56 | writel(0x0, data->membase + EMAC_MAC_MCMD_REG); |
| 57 | /* and read data */ |
| 58 | value = readl(data->membase + EMAC_MAC_MRDD_REG); |
| 59 | |
| 60 | return value; |
| 61 | } |
| 62 | |
| 63 | static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum, |
| 64 | u16 value) |
| 65 | { |
| 66 | struct sun4i_mdio_data *data = bus->priv; |
Emilio López | 2bf420a | 2013-07-22 22:09:18 -0300 | [diff] [blame] | 67 | unsigned long timeout_jiffies; |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 68 | |
| 69 | /* issue the phy address and reg */ |
| 70 | writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG); |
| 71 | /* pull up the phy io line */ |
| 72 | writel(0x1, data->membase + EMAC_MAC_MCMD_REG); |
| 73 | |
| 74 | /* Wait read complete */ |
Emilio López | 2bf420a | 2013-07-22 22:09:18 -0300 | [diff] [blame] | 75 | timeout_jiffies = jiffies + MDIO_TIMEOUT; |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 76 | while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { |
Emilio López | 2bf420a | 2013-07-22 22:09:18 -0300 | [diff] [blame] | 77 | if (time_is_before_jiffies(timeout_jiffies)) |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 78 | return -ETIMEDOUT; |
| 79 | msleep(1); |
| 80 | } |
| 81 | |
| 82 | /* push down the phy io line */ |
| 83 | writel(0x0, data->membase + EMAC_MAC_MCMD_REG); |
| 84 | /* and write data */ |
| 85 | writel(value, data->membase + EMAC_MAC_MWTD_REG); |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 90 | static int sun4i_mdio_probe(struct platform_device *pdev) |
| 91 | { |
| 92 | struct device_node *np = pdev->dev.of_node; |
| 93 | struct mii_bus *bus; |
| 94 | struct sun4i_mdio_data *data; |
Andrew Lunn | e7f4dc3 | 2016-01-06 20:11:15 +0100 | [diff] [blame] | 95 | int ret; |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 96 | |
| 97 | bus = mdiobus_alloc_size(sizeof(*data)); |
| 98 | if (!bus) |
| 99 | return -ENOMEM; |
| 100 | |
| 101 | bus->name = "sun4i_mii_bus"; |
| 102 | bus->read = &sun4i_mdio_read; |
| 103 | bus->write = &sun4i_mdio_write; |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 104 | snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev)); |
| 105 | bus->parent = &pdev->dev; |
| 106 | |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 107 | data = bus->priv; |
YueHaibing | 3894793 | 2019-08-27 21:50:32 +0800 | [diff] [blame] | 108 | data->membase = devm_platform_ioremap_resource(pdev, 0); |
Jisheng Zhang | 03536cc | 2013-08-26 21:11:57 +0800 | [diff] [blame] | 109 | if (IS_ERR(data->membase)) { |
| 110 | ret = PTR_ERR(data->membase); |
| 111 | goto err_out_free_mdiobus; |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | data->regulator = devm_regulator_get(&pdev->dev, "phy"); |
| 115 | if (IS_ERR(data->regulator)) { |
Christophe JAILLET | 56c0290 | 2018-01-06 09:00:09 +0100 | [diff] [blame] | 116 | if (PTR_ERR(data->regulator) == -EPROBE_DEFER) { |
| 117 | ret = -EPROBE_DEFER; |
| 118 | goto err_out_free_mdiobus; |
| 119 | } |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 120 | |
| 121 | dev_info(&pdev->dev, "no regulator found\n"); |
Dan Carpenter | 227f33b | 2016-03-21 12:02:31 +0300 | [diff] [blame] | 122 | data->regulator = NULL; |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 123 | } else { |
| 124 | ret = regulator_enable(data->regulator); |
| 125 | if (ret) |
Jisheng Zhang | 03536cc | 2013-08-26 21:11:57 +0800 | [diff] [blame] | 126 | goto err_out_free_mdiobus; |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | ret = of_mdiobus_register(bus, np); |
| 130 | if (ret < 0) |
| 131 | goto err_out_disable_regulator; |
| 132 | |
| 133 | platform_set_drvdata(pdev, bus); |
| 134 | |
| 135 | return 0; |
| 136 | |
| 137 | err_out_disable_regulator: |
Dan Carpenter | 227f33b | 2016-03-21 12:02:31 +0300 | [diff] [blame] | 138 | if (data->regulator) |
| 139 | regulator_disable(data->regulator); |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 140 | err_out_free_mdiobus: |
| 141 | mdiobus_free(bus); |
| 142 | return ret; |
| 143 | } |
| 144 | |
Uwe Kleine-König | efd8d90 | 2023-09-18 21:51:01 +0200 | [diff] [blame] | 145 | static void sun4i_mdio_remove(struct platform_device *pdev) |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 146 | { |
| 147 | struct mii_bus *bus = platform_get_drvdata(pdev); |
Chuhong Yuan | 39c68b3 | 2019-11-18 19:41:15 +0800 | [diff] [blame] | 148 | struct sun4i_mdio_data *data = bus->priv; |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 149 | |
| 150 | mdiobus_unregister(bus); |
Chuhong Yuan | 39c68b3 | 2019-11-18 19:41:15 +0800 | [diff] [blame] | 151 | if (data->regulator) |
| 152 | regulator_disable(data->regulator); |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 153 | mdiobus_free(bus); |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | static const struct of_device_id sun4i_mdio_dt_ids[] = { |
Maxime Ripard | efe2057 | 2014-02-02 14:49:12 +0100 | [diff] [blame] | 157 | { .compatible = "allwinner,sun4i-a10-mdio" }, |
| 158 | |
| 159 | /* Deprecated */ |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 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, |
Uwe Kleine-König | efd8d90 | 2023-09-18 21:51:01 +0200 | [diff] [blame] | 167 | .remove_new = sun4i_mdio_remove, |
Maxime Ripard | 4bdcb1d | 2013-05-30 03:49:21 +0000 | [diff] [blame] | 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>"); |
Andrew Lunn | 5f85757 | 2019-01-21 19:10:19 +0100 | [diff] [blame] | 178 | MODULE_LICENSE("GPL v2"); |