David Lechner | f2e6004 | 2016-05-09 18:40:00 -0500 | [diff] [blame] | 1 | /* |
| 2 | * phy-da8xx-usb - TI DaVinci DA8xx USB PHY driver |
| 3 | * |
| 4 | * Copyright (C) 2016 David Lechner <david@lechnology.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/clk.h> |
| 17 | #include <linux/io.h> |
| 18 | #include <linux/of.h> |
| 19 | #include <linux/mfd/da8xx-cfgchip.h> |
| 20 | #include <linux/mfd/syscon.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/phy/phy.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/regmap.h> |
| 25 | |
| 26 | struct da8xx_usb_phy { |
| 27 | struct phy_provider *phy_provider; |
| 28 | struct phy *usb11_phy; |
| 29 | struct phy *usb20_phy; |
| 30 | struct clk *usb11_clk; |
| 31 | struct clk *usb20_clk; |
| 32 | struct regmap *regmap; |
| 33 | }; |
| 34 | |
| 35 | static int da8xx_usb11_phy_power_on(struct phy *phy) |
| 36 | { |
| 37 | struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); |
| 38 | int ret; |
| 39 | |
| 40 | ret = clk_prepare_enable(d_phy->usb11_clk); |
| 41 | if (ret) |
| 42 | return ret; |
| 43 | |
| 44 | regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, |
| 45 | CFGCHIP2_USB1SUSPENDM); |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | static int da8xx_usb11_phy_power_off(struct phy *phy) |
| 51 | { |
| 52 | struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); |
| 53 | |
| 54 | regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, 0); |
| 55 | |
| 56 | clk_disable_unprepare(d_phy->usb11_clk); |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | static const struct phy_ops da8xx_usb11_phy_ops = { |
| 62 | .power_on = da8xx_usb11_phy_power_on, |
| 63 | .power_off = da8xx_usb11_phy_power_off, |
| 64 | .owner = THIS_MODULE, |
| 65 | }; |
| 66 | |
| 67 | static int da8xx_usb20_phy_power_on(struct phy *phy) |
| 68 | { |
| 69 | struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); |
| 70 | int ret; |
| 71 | |
| 72 | ret = clk_prepare_enable(d_phy->usb20_clk); |
| 73 | if (ret) |
| 74 | return ret; |
| 75 | |
| 76 | regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, 0); |
| 77 | |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | static int da8xx_usb20_phy_power_off(struct phy *phy) |
| 82 | { |
| 83 | struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); |
| 84 | |
| 85 | regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, |
| 86 | CFGCHIP2_OTGPWRDN); |
| 87 | |
| 88 | clk_disable_unprepare(d_phy->usb20_clk); |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static int da8xx_usb20_phy_set_mode(struct phy *phy, enum phy_mode mode) |
| 94 | { |
| 95 | struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); |
| 96 | u32 val; |
| 97 | |
| 98 | switch (mode) { |
| 99 | case PHY_MODE_USB_HOST: /* Force VBUS valid, ID = 0 */ |
| 100 | val = CFGCHIP2_OTGMODE_FORCE_HOST; |
| 101 | break; |
| 102 | case PHY_MODE_USB_DEVICE: /* Force VBUS valid, ID = 1 */ |
| 103 | val = CFGCHIP2_OTGMODE_FORCE_DEVICE; |
| 104 | break; |
| 105 | case PHY_MODE_USB_OTG: /* Don't override the VBUS/ID comparators */ |
| 106 | val = CFGCHIP2_OTGMODE_NO_OVERRIDE; |
| 107 | break; |
| 108 | default: |
| 109 | return -EINVAL; |
| 110 | } |
| 111 | |
| 112 | regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGMODE_MASK, |
| 113 | val); |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | static const struct phy_ops da8xx_usb20_phy_ops = { |
| 119 | .power_on = da8xx_usb20_phy_power_on, |
| 120 | .power_off = da8xx_usb20_phy_power_off, |
| 121 | .set_mode = da8xx_usb20_phy_set_mode, |
| 122 | .owner = THIS_MODULE, |
| 123 | }; |
| 124 | |
| 125 | static struct phy *da8xx_usb_phy_of_xlate(struct device *dev, |
| 126 | struct of_phandle_args *args) |
| 127 | { |
| 128 | struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev); |
| 129 | |
| 130 | if (!d_phy) |
| 131 | return ERR_PTR(-ENODEV); |
| 132 | |
| 133 | switch (args->args[0]) { |
| 134 | case 0: |
| 135 | return d_phy->usb20_phy; |
| 136 | case 1: |
| 137 | return d_phy->usb11_phy; |
| 138 | default: |
| 139 | return ERR_PTR(-EINVAL); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | static int da8xx_usb_phy_probe(struct platform_device *pdev) |
| 144 | { |
| 145 | struct device *dev = &pdev->dev; |
| 146 | struct device_node *node = dev->of_node; |
| 147 | struct da8xx_usb_phy *d_phy; |
| 148 | |
| 149 | d_phy = devm_kzalloc(dev, sizeof(*d_phy), GFP_KERNEL); |
| 150 | if (!d_phy) |
| 151 | return -ENOMEM; |
| 152 | |
| 153 | if (node) |
| 154 | d_phy->regmap = syscon_regmap_lookup_by_compatible( |
| 155 | "ti,da830-cfgchip"); |
| 156 | else |
| 157 | d_phy->regmap = syscon_regmap_lookup_by_pdevname("syscon.0"); |
| 158 | if (IS_ERR(d_phy->regmap)) { |
| 159 | dev_err(dev, "Failed to get syscon\n"); |
| 160 | return PTR_ERR(d_phy->regmap); |
| 161 | } |
| 162 | |
| 163 | d_phy->usb11_clk = devm_clk_get(dev, "usb11_phy"); |
| 164 | if (IS_ERR(d_phy->usb11_clk)) { |
| 165 | dev_err(dev, "Failed to get usb11_phy clock\n"); |
| 166 | return PTR_ERR(d_phy->usb11_clk); |
| 167 | } |
| 168 | |
| 169 | d_phy->usb20_clk = devm_clk_get(dev, "usb20_phy"); |
| 170 | if (IS_ERR(d_phy->usb20_clk)) { |
| 171 | dev_err(dev, "Failed to get usb20_phy clock\n"); |
| 172 | return PTR_ERR(d_phy->usb20_clk); |
| 173 | } |
| 174 | |
| 175 | d_phy->usb11_phy = devm_phy_create(dev, node, &da8xx_usb11_phy_ops); |
| 176 | if (IS_ERR(d_phy->usb11_phy)) { |
| 177 | dev_err(dev, "Failed to create usb11 phy\n"); |
| 178 | return PTR_ERR(d_phy->usb11_phy); |
| 179 | } |
| 180 | |
| 181 | d_phy->usb20_phy = devm_phy_create(dev, node, &da8xx_usb20_phy_ops); |
| 182 | if (IS_ERR(d_phy->usb20_phy)) { |
| 183 | dev_err(dev, "Failed to create usb20 phy\n"); |
| 184 | return PTR_ERR(d_phy->usb20_phy); |
| 185 | } |
| 186 | |
| 187 | platform_set_drvdata(pdev, d_phy); |
| 188 | phy_set_drvdata(d_phy->usb11_phy, d_phy); |
| 189 | phy_set_drvdata(d_phy->usb20_phy, d_phy); |
| 190 | |
| 191 | if (node) { |
| 192 | d_phy->phy_provider = devm_of_phy_provider_register(dev, |
| 193 | da8xx_usb_phy_of_xlate); |
| 194 | if (IS_ERR(d_phy->phy_provider)) { |
| 195 | dev_err(dev, "Failed to create phy provider\n"); |
| 196 | return PTR_ERR(d_phy->phy_provider); |
| 197 | } |
| 198 | } else { |
| 199 | int ret; |
| 200 | |
| 201 | ret = phy_create_lookup(d_phy->usb11_phy, "usb-phy", "ohci.0"); |
| 202 | if (ret) |
| 203 | dev_warn(dev, "Failed to create usb11 phy lookup\n"); |
| 204 | ret = phy_create_lookup(d_phy->usb20_phy, "usb-phy", |
| 205 | "musb-da8xx"); |
| 206 | if (ret) |
| 207 | dev_warn(dev, "Failed to create usb20 phy lookup\n"); |
| 208 | } |
| 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | static int da8xx_usb_phy_remove(struct platform_device *pdev) |
| 214 | { |
| 215 | struct da8xx_usb_phy *d_phy = platform_get_drvdata(pdev); |
| 216 | |
| 217 | if (!pdev->dev.of_node) { |
| 218 | phy_remove_lookup(d_phy->usb20_phy, "usb-phy", "musb-da8xx"); |
| 219 | phy_remove_lookup(d_phy->usb11_phy, "usb-phy", "ohci.0"); |
| 220 | } |
| 221 | |
| 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | static const struct of_device_id da8xx_usb_phy_ids[] = { |
| 226 | { .compatible = "ti,da830-usb-phy" }, |
| 227 | { } |
| 228 | }; |
| 229 | MODULE_DEVICE_TABLE(of, da8xx_usb_phy_ids); |
| 230 | |
| 231 | static struct platform_driver da8xx_usb_phy_driver = { |
| 232 | .probe = da8xx_usb_phy_probe, |
| 233 | .remove = da8xx_usb_phy_remove, |
| 234 | .driver = { |
| 235 | .name = "da8xx-usb-phy", |
| 236 | .of_match_table = da8xx_usb_phy_ids, |
| 237 | }, |
| 238 | }; |
| 239 | |
| 240 | module_platform_driver(da8xx_usb_phy_driver); |
| 241 | |
| 242 | MODULE_ALIAS("platform:da8xx-usb-phy"); |
| 243 | MODULE_AUTHOR("David Lechner <david@lechnology.com>"); |
| 244 | MODULE_DESCRIPTION("TI DA8xx USB PHY driver"); |
| 245 | MODULE_LICENSE("GPL v2"); |