Giuseppe CAVALLARO | 732fdf0 | 2014-11-18 09:47:01 +0100 | [diff] [blame] | 1 | /* |
Chen-Yu Tsai | af0bd4e | 2014-01-17 21:24:47 +0800 | [diff] [blame] | 2 | * dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer |
| 3 | * |
| 4 | * Copyright (C) 2013 Chen-Yu Tsai |
| 5 | * |
| 6 | * Chen-Yu Tsai <wens@csie.org> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/stmmac.h> |
| 20 | #include <linux/clk.h> |
Joachim Eastwood | 4198b7d | 2015-05-14 12:11:05 +0200 | [diff] [blame] | 21 | #include <linux/module.h> |
Chen-Yu Tsai | af0bd4e | 2014-01-17 21:24:47 +0800 | [diff] [blame] | 22 | #include <linux/phy.h> |
Joachim Eastwood | 4198b7d | 2015-05-14 12:11:05 +0200 | [diff] [blame] | 23 | #include <linux/platform_device.h> |
Chen-Yu Tsai | af0bd4e | 2014-01-17 21:24:47 +0800 | [diff] [blame] | 24 | #include <linux/of_net.h> |
| 25 | #include <linux/regulator/consumer.h> |
| 26 | |
Andy Shevchenko | f10f9fb | 2014-11-07 16:46:42 +0200 | [diff] [blame] | 27 | #include "stmmac_platform.h" |
| 28 | |
Chen-Yu Tsai | af0bd4e | 2014-01-17 21:24:47 +0800 | [diff] [blame] | 29 | struct sunxi_priv_data { |
| 30 | int interface; |
| 31 | int clk_enabled; |
| 32 | struct clk *tx_clk; |
| 33 | struct regulator *regulator; |
| 34 | }; |
| 35 | |
Chen-Yu Tsai | af0bd4e | 2014-01-17 21:24:47 +0800 | [diff] [blame] | 36 | #define SUN7I_GMAC_GMII_RGMII_RATE 125000000 |
| 37 | #define SUN7I_GMAC_MII_RATE 25000000 |
| 38 | |
| 39 | static int sun7i_gmac_init(struct platform_device *pdev, void *priv) |
| 40 | { |
| 41 | struct sunxi_priv_data *gmac = priv; |
| 42 | int ret; |
| 43 | |
| 44 | if (gmac->regulator) { |
| 45 | ret = regulator_enable(gmac->regulator); |
| 46 | if (ret) |
| 47 | return ret; |
| 48 | } |
| 49 | |
| 50 | /* Set GMAC interface port mode |
| 51 | * |
| 52 | * The GMAC TX clock lines are configured by setting the clock |
| 53 | * rate, which then uses the auto-reparenting feature of the |
| 54 | * clock driver, and enabling/disabling the clock. |
| 55 | */ |
| 56 | if (gmac->interface == PHY_INTERFACE_MODE_RGMII) { |
| 57 | clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE); |
| 58 | clk_prepare_enable(gmac->tx_clk); |
| 59 | gmac->clk_enabled = 1; |
| 60 | } else { |
| 61 | clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE); |
| 62 | clk_prepare(gmac->tx_clk); |
| 63 | } |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | static void sun7i_gmac_exit(struct platform_device *pdev, void *priv) |
| 69 | { |
| 70 | struct sunxi_priv_data *gmac = priv; |
| 71 | |
| 72 | if (gmac->clk_enabled) { |
| 73 | clk_disable(gmac->tx_clk); |
| 74 | gmac->clk_enabled = 0; |
| 75 | } |
| 76 | clk_unprepare(gmac->tx_clk); |
| 77 | |
| 78 | if (gmac->regulator) |
| 79 | regulator_disable(gmac->regulator); |
| 80 | } |
| 81 | |
| 82 | static void sun7i_fix_speed(void *priv, unsigned int speed) |
| 83 | { |
| 84 | struct sunxi_priv_data *gmac = priv; |
| 85 | |
| 86 | /* only GMII mode requires us to reconfigure the clock lines */ |
| 87 | if (gmac->interface != PHY_INTERFACE_MODE_GMII) |
| 88 | return; |
| 89 | |
| 90 | if (gmac->clk_enabled) { |
| 91 | clk_disable(gmac->tx_clk); |
| 92 | gmac->clk_enabled = 0; |
| 93 | } |
| 94 | clk_unprepare(gmac->tx_clk); |
| 95 | |
| 96 | if (speed == 1000) { |
| 97 | clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE); |
| 98 | clk_prepare_enable(gmac->tx_clk); |
| 99 | gmac->clk_enabled = 1; |
| 100 | } else { |
| 101 | clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE); |
| 102 | clk_prepare(gmac->tx_clk); |
| 103 | } |
| 104 | } |
| 105 | |
Joachim Eastwood | 9a9e9a1 | 2015-07-29 00:08:54 +0200 | [diff] [blame] | 106 | static int sun7i_gmac_probe(struct platform_device *pdev) |
Joachim Eastwood | 22caae0 | 2015-07-29 00:08:53 +0200 | [diff] [blame] | 107 | { |
Joachim Eastwood | 9a9e9a1 | 2015-07-29 00:08:54 +0200 | [diff] [blame] | 108 | struct plat_stmmacenet_data *plat_dat; |
| 109 | struct stmmac_resources stmmac_res; |
Joachim Eastwood | 22caae0 | 2015-07-29 00:08:53 +0200 | [diff] [blame] | 110 | struct sunxi_priv_data *gmac; |
| 111 | struct device *dev = &pdev->dev; |
Joachim Eastwood | 9a9e9a1 | 2015-07-29 00:08:54 +0200 | [diff] [blame] | 112 | int ret; |
| 113 | |
| 114 | ret = stmmac_get_platform_resources(pdev, &stmmac_res); |
| 115 | if (ret) |
| 116 | return ret; |
| 117 | |
| 118 | plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac); |
| 119 | if (IS_ERR(plat_dat)) |
| 120 | return PTR_ERR(plat_dat); |
Joachim Eastwood | 22caae0 | 2015-07-29 00:08:53 +0200 | [diff] [blame] | 121 | |
| 122 | gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL); |
Johan Hovold | d2ed0a7 | 2016-11-30 15:29:55 +0100 | [diff] [blame] | 123 | if (!gmac) { |
| 124 | ret = -ENOMEM; |
| 125 | goto err_remove_config_dt; |
| 126 | } |
Joachim Eastwood | 22caae0 | 2015-07-29 00:08:53 +0200 | [diff] [blame] | 127 | |
| 128 | gmac->interface = of_get_phy_mode(dev->of_node); |
| 129 | |
| 130 | gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx"); |
| 131 | if (IS_ERR(gmac->tx_clk)) { |
| 132 | dev_err(dev, "could not get tx clock\n"); |
Johan Hovold | d2ed0a7 | 2016-11-30 15:29:55 +0100 | [diff] [blame] | 133 | ret = PTR_ERR(gmac->tx_clk); |
| 134 | goto err_remove_config_dt; |
Joachim Eastwood | 22caae0 | 2015-07-29 00:08:53 +0200 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | /* Optional regulator for PHY */ |
| 138 | gmac->regulator = devm_regulator_get_optional(dev, "phy"); |
| 139 | if (IS_ERR(gmac->regulator)) { |
Johan Hovold | d2ed0a7 | 2016-11-30 15:29:55 +0100 | [diff] [blame] | 140 | if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER) { |
| 141 | ret = -EPROBE_DEFER; |
| 142 | goto err_remove_config_dt; |
| 143 | } |
Joachim Eastwood | 22caae0 | 2015-07-29 00:08:53 +0200 | [diff] [blame] | 144 | dev_info(dev, "no regulator found\n"); |
| 145 | gmac->regulator = NULL; |
| 146 | } |
| 147 | |
Joachim Eastwood | 9a9e9a1 | 2015-07-29 00:08:54 +0200 | [diff] [blame] | 148 | /* platform data specifying hardware features and callbacks. |
| 149 | * hardware features were copied from Allwinner drivers. */ |
| 150 | plat_dat->tx_coe = 1; |
| 151 | plat_dat->has_gmac = true; |
| 152 | plat_dat->bsp_priv = gmac; |
| 153 | plat_dat->init = sun7i_gmac_init; |
| 154 | plat_dat->exit = sun7i_gmac_exit; |
| 155 | plat_dat->fix_mac_speed = sun7i_fix_speed; |
| 156 | |
| 157 | ret = sun7i_gmac_init(pdev, plat_dat->bsp_priv); |
| 158 | if (ret) |
Johan Hovold | d2ed0a7 | 2016-11-30 15:29:55 +0100 | [diff] [blame] | 159 | goto err_remove_config_dt; |
Joachim Eastwood | 9a9e9a1 | 2015-07-29 00:08:54 +0200 | [diff] [blame] | 160 | |
Chen-Yu Tsai | d856c16 | 2015-12-11 18:03:49 +0800 | [diff] [blame] | 161 | ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); |
| 162 | if (ret) |
Johan Hovold | d2ed0a7 | 2016-11-30 15:29:55 +0100 | [diff] [blame] | 163 | goto err_gmac_exit; |
| 164 | |
| 165 | return 0; |
| 166 | |
| 167 | err_gmac_exit: |
| 168 | sun7i_gmac_exit(pdev, plat_dat->bsp_priv); |
| 169 | err_remove_config_dt: |
| 170 | stmmac_remove_config_dt(pdev, plat_dat); |
Chen-Yu Tsai | d856c16 | 2015-12-11 18:03:49 +0800 | [diff] [blame] | 171 | |
| 172 | return ret; |
Joachim Eastwood | 22caae0 | 2015-07-29 00:08:53 +0200 | [diff] [blame] | 173 | } |
| 174 | |
Joachim Eastwood | 4198b7d | 2015-05-14 12:11:05 +0200 | [diff] [blame] | 175 | static const struct of_device_id sun7i_dwmac_match[] = { |
Joachim Eastwood | 9a9e9a1 | 2015-07-29 00:08:54 +0200 | [diff] [blame] | 176 | { .compatible = "allwinner,sun7i-a20-gmac" }, |
Joachim Eastwood | 4198b7d | 2015-05-14 12:11:05 +0200 | [diff] [blame] | 177 | { } |
| 178 | }; |
| 179 | MODULE_DEVICE_TABLE(of, sun7i_dwmac_match); |
| 180 | |
| 181 | static struct platform_driver sun7i_dwmac_driver = { |
Joachim Eastwood | 9a9e9a1 | 2015-07-29 00:08:54 +0200 | [diff] [blame] | 182 | .probe = sun7i_gmac_probe, |
Joachim Eastwood | 4198b7d | 2015-05-14 12:11:05 +0200 | [diff] [blame] | 183 | .remove = stmmac_pltfr_remove, |
| 184 | .driver = { |
| 185 | .name = "sun7i-dwmac", |
| 186 | .pm = &stmmac_pltfr_pm_ops, |
| 187 | .of_match_table = sun7i_dwmac_match, |
| 188 | }, |
| 189 | }; |
| 190 | module_platform_driver(sun7i_dwmac_driver); |
| 191 | |
| 192 | MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>"); |
| 193 | MODULE_DESCRIPTION("Allwinner sunxi DWMAC specific glue layer"); |
| 194 | MODULE_LICENSE("GPL"); |