Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 1 | /* |
| 2 | * omap-usb2.c - USB PHY, talking to musb controller in OMAP. |
| 3 | * |
| 4 | * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * Author: Kishon Vijay Abraham I <kishon@ti.com> |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/of.h> |
| 23 | #include <linux/io.h> |
| 24 | #include <linux/usb/omap_usb.h> |
| 25 | #include <linux/usb/phy_companion.h> |
| 26 | #include <linux/clk.h> |
| 27 | #include <linux/err.h> |
| 28 | #include <linux/pm_runtime.h> |
| 29 | #include <linux/delay.h> |
Kishon Vijay Abraham I | ca784be | 2013-01-25 15:54:00 +0530 | [diff] [blame] | 30 | #include <linux/usb/omap_control_usb.h> |
Kishon Vijay Abraham I | 5d93d1e | 2013-09-27 11:53:26 +0530 | [diff] [blame^] | 31 | #include <linux/phy/phy.h> |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 32 | |
| 33 | /** |
| 34 | * omap_usb2_set_comparator - links the comparator present in the sytem with |
| 35 | * this phy |
| 36 | * @comparator - the companion phy(comparator) for this phy |
| 37 | * |
| 38 | * The phy companion driver should call this API passing the phy_companion |
| 39 | * filled with set_vbus and start_srp to be used by usb phy. |
| 40 | * |
| 41 | * For use by phy companion driver |
| 42 | */ |
| 43 | int omap_usb2_set_comparator(struct phy_companion *comparator) |
| 44 | { |
| 45 | struct omap_usb *phy; |
| 46 | struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2); |
| 47 | |
| 48 | if (IS_ERR(x)) |
| 49 | return -ENODEV; |
| 50 | |
| 51 | phy = phy_to_omapusb(x); |
| 52 | phy->comparator = comparator; |
| 53 | return 0; |
| 54 | } |
| 55 | EXPORT_SYMBOL_GPL(omap_usb2_set_comparator); |
| 56 | |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 57 | static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled) |
| 58 | { |
| 59 | struct omap_usb *phy = phy_to_omapusb(otg->phy); |
| 60 | |
| 61 | if (!phy->comparator) |
| 62 | return -ENODEV; |
| 63 | |
| 64 | return phy->comparator->set_vbus(phy->comparator, enabled); |
| 65 | } |
| 66 | |
| 67 | static int omap_usb_start_srp(struct usb_otg *otg) |
| 68 | { |
| 69 | struct omap_usb *phy = phy_to_omapusb(otg->phy); |
| 70 | |
| 71 | if (!phy->comparator) |
| 72 | return -ENODEV; |
| 73 | |
| 74 | return phy->comparator->start_srp(phy->comparator); |
| 75 | } |
| 76 | |
| 77 | static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host) |
| 78 | { |
| 79 | struct usb_phy *phy = otg->phy; |
| 80 | |
| 81 | otg->host = host; |
| 82 | if (!host) |
| 83 | phy->state = OTG_STATE_UNDEFINED; |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static int omap_usb_set_peripheral(struct usb_otg *otg, |
| 89 | struct usb_gadget *gadget) |
| 90 | { |
| 91 | struct usb_phy *phy = otg->phy; |
| 92 | |
| 93 | otg->gadget = gadget; |
| 94 | if (!gadget) |
| 95 | phy->state = OTG_STATE_UNDEFINED; |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static int omap_usb2_suspend(struct usb_phy *x, int suspend) |
| 101 | { |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 102 | struct omap_usb *phy = phy_to_omapusb(x); |
Dan Carpenter | 0f82768 | 2013-08-21 11:41:22 +0300 | [diff] [blame] | 103 | int ret; |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 104 | |
| 105 | if (suspend && !phy->is_suspended) { |
Kishon Vijay Abraham I | ca784be | 2013-01-25 15:54:00 +0530 | [diff] [blame] | 106 | omap_control_usb_phy_power(phy->control_dev, 0); |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 107 | pm_runtime_put_sync(phy->dev); |
| 108 | phy->is_suspended = 1; |
| 109 | } else if (!suspend && phy->is_suspended) { |
| 110 | ret = pm_runtime_get_sync(phy->dev); |
| 111 | if (ret < 0) { |
Dan Carpenter | 0f82768 | 2013-08-21 11:41:22 +0300 | [diff] [blame] | 112 | dev_err(phy->dev, "get_sync failed with err %d\n", ret); |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 113 | return ret; |
| 114 | } |
Kishon Vijay Abraham I | ca784be | 2013-01-25 15:54:00 +0530 | [diff] [blame] | 115 | omap_control_usb_phy_power(phy->control_dev, 1); |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 116 | phy->is_suspended = 0; |
| 117 | } |
| 118 | |
| 119 | return 0; |
| 120 | } |
| 121 | |
Kishon Vijay Abraham I | 5d93d1e | 2013-09-27 11:53:26 +0530 | [diff] [blame^] | 122 | static int omap_usb_power_off(struct phy *x) |
| 123 | { |
| 124 | struct omap_usb *phy = phy_get_drvdata(x); |
| 125 | |
| 126 | omap_control_usb_phy_power(phy->control_dev, 0); |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static int omap_usb_power_on(struct phy *x) |
| 132 | { |
| 133 | struct omap_usb *phy = phy_get_drvdata(x); |
| 134 | |
| 135 | omap_control_usb_phy_power(phy->control_dev, 1); |
| 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static struct phy_ops ops = { |
| 141 | .power_on = omap_usb_power_on, |
| 142 | .power_off = omap_usb_power_off, |
| 143 | .owner = THIS_MODULE, |
| 144 | }; |
| 145 | |
Bill Pemberton | 41ac7b3 | 2012-11-19 13:21:48 -0500 | [diff] [blame] | 146 | static int omap_usb2_probe(struct platform_device *pdev) |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 147 | { |
| 148 | struct omap_usb *phy; |
Kishon Vijay Abraham I | 5d93d1e | 2013-09-27 11:53:26 +0530 | [diff] [blame^] | 149 | struct phy *generic_phy; |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 150 | struct usb_otg *otg; |
Kishon Vijay Abraham I | 5d93d1e | 2013-09-27 11:53:26 +0530 | [diff] [blame^] | 151 | struct phy_provider *phy_provider; |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 152 | |
| 153 | phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL); |
| 154 | if (!phy) { |
| 155 | dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n"); |
| 156 | return -ENOMEM; |
| 157 | } |
| 158 | |
| 159 | otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL); |
| 160 | if (!otg) { |
| 161 | dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n"); |
| 162 | return -ENOMEM; |
| 163 | } |
| 164 | |
| 165 | phy->dev = &pdev->dev; |
| 166 | |
| 167 | phy->phy.dev = phy->dev; |
| 168 | phy->phy.label = "omap-usb2"; |
| 169 | phy->phy.set_suspend = omap_usb2_suspend; |
| 170 | phy->phy.otg = otg; |
Kishon Vijay Abraham I | c11747f | 2013-01-25 08:03:24 +0530 | [diff] [blame] | 171 | phy->phy.type = USB_PHY_TYPE_USB2; |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 172 | |
Kishon Vijay Abraham I | 5d93d1e | 2013-09-27 11:53:26 +0530 | [diff] [blame^] | 173 | phy_provider = devm_of_phy_provider_register(phy->dev, |
| 174 | of_phy_simple_xlate); |
| 175 | if (IS_ERR(phy_provider)) |
| 176 | return PTR_ERR(phy_provider); |
| 177 | |
Kishon Vijay Abraham I | ca784be | 2013-01-25 15:54:00 +0530 | [diff] [blame] | 178 | phy->control_dev = omap_get_control_dev(); |
| 179 | if (IS_ERR(phy->control_dev)) { |
| 180 | dev_dbg(&pdev->dev, "Failed to get control device\n"); |
| 181 | return -ENODEV; |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | phy->is_suspended = 1; |
Kishon Vijay Abraham I | ca784be | 2013-01-25 15:54:00 +0530 | [diff] [blame] | 185 | omap_control_usb_phy_power(phy->control_dev, 0); |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 186 | |
| 187 | otg->set_host = omap_usb_set_host; |
| 188 | otg->set_peripheral = omap_usb_set_peripheral; |
| 189 | otg->set_vbus = omap_usb_set_vbus; |
| 190 | otg->start_srp = omap_usb_start_srp; |
| 191 | otg->phy = &phy->phy; |
| 192 | |
Kishon Vijay Abraham I | 5d93d1e | 2013-09-27 11:53:26 +0530 | [diff] [blame^] | 193 | platform_set_drvdata(pdev, phy); |
| 194 | pm_runtime_enable(phy->dev); |
| 195 | |
| 196 | generic_phy = devm_phy_create(phy->dev, &ops, NULL); |
| 197 | if (IS_ERR(generic_phy)) |
| 198 | return PTR_ERR(generic_phy); |
| 199 | |
| 200 | phy_set_drvdata(generic_phy, phy); |
| 201 | |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 202 | phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k"); |
| 203 | if (IS_ERR(phy->wkupclk)) { |
| 204 | dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n"); |
| 205 | return PTR_ERR(phy->wkupclk); |
| 206 | } |
| 207 | clk_prepare(phy->wkupclk); |
| 208 | |
Kishon Vijay Abraham I | 0c4c8bb | 2013-01-25 08:21:49 +0530 | [diff] [blame] | 209 | phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m"); |
| 210 | if (IS_ERR(phy->optclk)) |
| 211 | dev_vdbg(&pdev->dev, "unable to get refclk960m\n"); |
| 212 | else |
| 213 | clk_prepare(phy->optclk); |
| 214 | |
Kishon Vijay Abraham I | c11747f | 2013-01-25 08:03:24 +0530 | [diff] [blame] | 215 | usb_add_phy_dev(&phy->phy); |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 216 | |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 217 | return 0; |
| 218 | } |
| 219 | |
Bill Pemberton | fb4e98a | 2012-11-19 13:26:20 -0500 | [diff] [blame] | 220 | static int omap_usb2_remove(struct platform_device *pdev) |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 221 | { |
| 222 | struct omap_usb *phy = platform_get_drvdata(pdev); |
| 223 | |
| 224 | clk_unprepare(phy->wkupclk); |
Kishon Vijay Abraham I | 0c4c8bb | 2013-01-25 08:21:49 +0530 | [diff] [blame] | 225 | if (!IS_ERR(phy->optclk)) |
| 226 | clk_unprepare(phy->optclk); |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 227 | usb_remove_phy(&phy->phy); |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | #ifdef CONFIG_PM_RUNTIME |
| 233 | |
| 234 | static int omap_usb2_runtime_suspend(struct device *dev) |
| 235 | { |
| 236 | struct platform_device *pdev = to_platform_device(dev); |
| 237 | struct omap_usb *phy = platform_get_drvdata(pdev); |
| 238 | |
| 239 | clk_disable(phy->wkupclk); |
Kishon Vijay Abraham I | 0c4c8bb | 2013-01-25 08:21:49 +0530 | [diff] [blame] | 240 | if (!IS_ERR(phy->optclk)) |
| 241 | clk_disable(phy->optclk); |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 242 | |
| 243 | return 0; |
| 244 | } |
| 245 | |
| 246 | static int omap_usb2_runtime_resume(struct device *dev) |
| 247 | { |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 248 | struct platform_device *pdev = to_platform_device(dev); |
| 249 | struct omap_usb *phy = platform_get_drvdata(pdev); |
Dan Carpenter | 0f82768 | 2013-08-21 11:41:22 +0300 | [diff] [blame] | 250 | int ret; |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 251 | |
| 252 | ret = clk_enable(phy->wkupclk); |
Kishon Vijay Abraham I | 0c4c8bb | 2013-01-25 08:21:49 +0530 | [diff] [blame] | 253 | if (ret < 0) { |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 254 | dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret); |
Kishon Vijay Abraham I | 0c4c8bb | 2013-01-25 08:21:49 +0530 | [diff] [blame] | 255 | goto err0; |
| 256 | } |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 257 | |
Kishon Vijay Abraham I | 0c4c8bb | 2013-01-25 08:21:49 +0530 | [diff] [blame] | 258 | if (!IS_ERR(phy->optclk)) { |
| 259 | ret = clk_enable(phy->optclk); |
| 260 | if (ret < 0) { |
| 261 | dev_err(phy->dev, "Failed to enable optclk %d\n", ret); |
| 262 | goto err1; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | return 0; |
| 267 | |
| 268 | err1: |
| 269 | clk_disable(phy->wkupclk); |
| 270 | |
| 271 | err0: |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 272 | return ret; |
| 273 | } |
| 274 | |
| 275 | static const struct dev_pm_ops omap_usb2_pm_ops = { |
| 276 | SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume, |
| 277 | NULL) |
| 278 | }; |
| 279 | |
| 280 | #define DEV_PM_OPS (&omap_usb2_pm_ops) |
| 281 | #else |
| 282 | #define DEV_PM_OPS NULL |
| 283 | #endif |
| 284 | |
| 285 | #ifdef CONFIG_OF |
| 286 | static const struct of_device_id omap_usb2_id_table[] = { |
| 287 | { .compatible = "ti,omap-usb2" }, |
| 288 | {} |
| 289 | }; |
| 290 | MODULE_DEVICE_TABLE(of, omap_usb2_id_table); |
| 291 | #endif |
| 292 | |
| 293 | static struct platform_driver omap_usb2_driver = { |
| 294 | .probe = omap_usb2_probe, |
Bill Pemberton | 7690417 | 2012-11-19 13:21:08 -0500 | [diff] [blame] | 295 | .remove = omap_usb2_remove, |
Kishon Vijay Abraham I | 657b306 | 2012-09-06 20:27:06 +0530 | [diff] [blame] | 296 | .driver = { |
| 297 | .name = "omap-usb2", |
| 298 | .owner = THIS_MODULE, |
| 299 | .pm = DEV_PM_OPS, |
| 300 | .of_match_table = of_match_ptr(omap_usb2_id_table), |
| 301 | }, |
| 302 | }; |
| 303 | |
| 304 | module_platform_driver(omap_usb2_driver); |
| 305 | |
| 306 | MODULE_ALIAS("platform: omap_usb2"); |
| 307 | MODULE_AUTHOR("Texas Instruments Inc."); |
| 308 | MODULE_DESCRIPTION("OMAP USB2 phy driver"); |
| 309 | MODULE_LICENSE("GPL v2"); |