drivers/phy/phy-omap-control.c

   1 /*
   2  * omap-control-phy.c - The PHY part of control module.
   3  *
   4  * Copyright (C) 2013 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/of_device.h>
  24 #include <linux/err.h>
  25 #include <linux/io.h>
  26 #include <linux/clk.h>
  27 #include <linux/phy/omap_control_phy.h>
  28
  29 /**
  30  * omap_control_phy_power - power on/off the phy using control module reg
  31  * @dev: the control module device
  32  * @on: 0 or 1, based on powering on or off the PHY
  33  */
  34 void omap_control_phy_power(struct device *dev, int on)
  35 {
  36         u32 val;
  37         unsigned long rate;
  38         struct omap_control_phy *control_phy;
  39
  40         if (IS_ERR(dev) || !dev) {
  41                 pr_err("%s: invalid device\n", __func__);
  42                 return;
  43         }
  44
  45         control_phy = dev_get_drvdata(dev);
  46         if (!control_phy) {
  47                 dev_err(dev, "%s: invalid control phy device\n", __func__);
  48                 return;
  49         }
  50
  51         if (control_phy->type == OMAP_CTRL_TYPE_OTGHS)
  52                 return;
  53
  54         val = readl(control_phy->power);
  55
  56         switch (control_phy->type) {
  57         case OMAP_CTRL_TYPE_USB2:
  58                 if (on)
  59                         val &= ~OMAP_CTRL_DEV_PHY_PD;
  60                 else
  61                         val |= OMAP_CTRL_DEV_PHY_PD;
  62                 break;
  63
  64         case OMAP_CTRL_TYPE_PIPE3:
  65                 rate = clk_get_rate(control_phy->sys_clk);
  66                 rate = rate/1000000;
  67
  68                 if (on) {
  69                         val &= ~(OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK |
  70                                 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK);
  71                         val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON <<
  72                                 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
  73                         val |= rate <<
  74                                 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT;
  75                 } else {
  76                         val &= ~OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK;
  77                         val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF <<
  78                                 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
  79                 }
  80                 break;
  81
  82         case OMAP_CTRL_TYPE_DRA7USB2:
  83                 if (on)
  84                         val &= ~OMAP_CTRL_USB2_PHY_PD;
  85                 else
  86                         val |= OMAP_CTRL_USB2_PHY_PD;
  87                 break;
  88
  89         case OMAP_CTRL_TYPE_AM437USB2:
  90                 if (on) {
  91                         val &= ~(AM437X_CTRL_USB2_PHY_PD |
  92                                         AM437X_CTRL_USB2_OTG_PD);
  93                         val |= (AM437X_CTRL_USB2_OTGVDET_EN |
  94                                         AM437X_CTRL_USB2_OTGSESSEND_EN);
  95                 } else {
  96                         val &= ~(AM437X_CTRL_USB2_OTGVDET_EN |
  97                                         AM437X_CTRL_USB2_OTGSESSEND_EN);
  98                         val |= (AM437X_CTRL_USB2_PHY_PD |
  99                                          AM437X_CTRL_USB2_OTG_PD);
 100                 }
 101                 break;
 102         default:
 103                 dev_err(dev, "%s: type %d not recognized\n",
 104                         __func__, control_phy->type);
 105                 break;
 106         }
 107
 108         writel(val, control_phy->power);
 109 }
 110 EXPORT_SYMBOL_GPL(omap_control_phy_power);
 111
 112 /**
 113  * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
 114  * @ctrl_phy: struct omap_control_phy *
 115  *
 116  * Writes to the mailbox register to notify the usb core that a usb
 117  * device has been connected.
 118  */
 119 static void omap_control_usb_host_mode(struct omap_control_phy *ctrl_phy)
 120 {
 121         u32 val;
 122
 123         val = readl(ctrl_phy->otghs_control);
 124         val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND);
 125         val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;
 126         writel(val, ctrl_phy->otghs_control);
 127 }
 128
 129 /**
 130  * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
 131  * impedance
 132  * @ctrl_phy: struct omap_control_phy *
 133  *
 134  * Writes to the mailbox register to notify the usb core that it has been
 135  * connected to a usb host.
 136  */
 137 static void omap_control_usb_device_mode(struct omap_control_phy *ctrl_phy)
 138 {
 139         u32 val;
 140
 141         val = readl(ctrl_phy->otghs_control);
 142         val &= ~OMAP_CTRL_DEV_SESSEND;
 143         val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID |
 144                 OMAP_CTRL_DEV_VBUSVALID;
 145         writel(val, ctrl_phy->otghs_control);
 146 }
 147
 148 /**
 149  * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
 150  * impedance
 151  * @ctrl_phy: struct omap_control_phy *
 152  *
 153  * Writes to the mailbox register to notify the usb core it's now in
 154  * disconnected state.
 155  */
 156 static void omap_control_usb_set_sessionend(struct omap_control_phy *ctrl_phy)
 157 {
 158         u32 val;
 159
 160         val = readl(ctrl_phy->otghs_control);
 161         val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID);
 162         val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND;
 163         writel(val, ctrl_phy->otghs_control);
 164 }
 165
 166 /**
 167  * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode
 168  * or device mode or to denote disconnected state
 169  * @dev: the control module device
 170  * @mode: The mode to which usb should be configured
 171  *
 172  * This is an API to write to the mailbox register to notify the usb core that
 173  * a usb device has been connected.
 174  */
 175 void omap_control_usb_set_mode(struct device *dev,
 176         enum omap_control_usb_mode mode)
 177 {
 178         struct omap_control_phy *ctrl_phy;
 179
 180         if (IS_ERR(dev) || !dev)
 181                 return;
 182
 183         ctrl_phy = dev_get_drvdata(dev);
 184
 185         if (!ctrl_phy) {
 186                 dev_err(dev, "Invalid control phy device\n");
 187                 return;
 188         }
 189
 190         if (ctrl_phy->type != OMAP_CTRL_TYPE_OTGHS)
 191                 return;
 192
 193         switch (mode) {
 194         case USB_MODE_HOST:
 195                 omap_control_usb_host_mode(ctrl_phy);
 196                 break;
 197         case USB_MODE_DEVICE:
 198                 omap_control_usb_device_mode(ctrl_phy);
 199                 break;
 200         case USB_MODE_DISCONNECT:
 201                 omap_control_usb_set_sessionend(ctrl_phy);
 202                 break;
 203         default:
 204                 dev_vdbg(dev, "invalid omap control usb mode\n");
 205         }
 206 }
 207 EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);
 208
 209 #ifdef CONFIG_OF
 210
 211 static const enum omap_control_phy_type otghs_data = OMAP_CTRL_TYPE_OTGHS;
 212 static const enum omap_control_phy_type usb2_data = OMAP_CTRL_TYPE_USB2;
 213 static const enum omap_control_phy_type pipe3_data = OMAP_CTRL_TYPE_PIPE3;
 214 static const enum omap_control_phy_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2;
 215 static const enum omap_control_phy_type am437usb2_data = OMAP_CTRL_TYPE_AM437USB2;
 216
 217 static const struct of_device_id omap_control_phy_id_table[] = {
 218         {
 219                 .compatible = "ti,control-phy-otghs",
 220                 .data = &otghs_data,
 221         },
 222         {
 223                 .compatible = "ti,control-phy-usb2",
 224                 .data = &usb2_data,
 225         },
 226         {
 227                 .compatible = "ti,control-phy-pipe3",
 228                 .data = &pipe3_data,
 229         },
 230         {
 231                 .compatible = "ti,control-phy-usb2-dra7",
 232                 .data = &dra7usb2_data,
 233         },
 234         {
 235                 .compatible = "ti,control-phy-usb2-am437",
 236                 .data = &am437usb2_data,
 237         },
 238         {},
 239 };
 240 MODULE_DEVICE_TABLE(of, omap_control_phy_id_table);
 241 #endif
 242
 243
 244 static int omap_control_phy_probe(struct platform_device *pdev)
 245 {
 246         struct resource *res;
 247         const struct of_device_id *of_id;
 248         struct omap_control_phy *control_phy;
 249
 250         of_id = of_match_device(of_match_ptr(omap_control_phy_id_table),
 251                                 &pdev->dev);
 252         if (!of_id)
 253                 return -EINVAL;
 254
 255         control_phy = devm_kzalloc(&pdev->dev, sizeof(*control_phy),
 256                 GFP_KERNEL);
 257         if (!control_phy) {
 258                 dev_err(&pdev->dev, "unable to alloc memory for control phy\n");
 259                 return -ENOMEM;
 260         }
 261
 262         control_phy->dev = &pdev->dev;
 263         control_phy->type = *(enum omap_control_phy_type *)of_id->data;
 264
 265         if (control_phy->type == OMAP_CTRL_TYPE_OTGHS) {
 266                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 267                         "otghs_control");
 268                 control_phy->otghs_control = devm_ioremap_resource(
 269                         &pdev->dev, res);
 270                 if (IS_ERR(control_phy->otghs_control))
 271                         return PTR_ERR(control_phy->otghs_control);
 272         } else {
 273                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 274                                 "power");
 275                 control_phy->power = devm_ioremap_resource(&pdev->dev, res);
 276                 if (IS_ERR(control_phy->power)) {
 277                         dev_err(&pdev->dev, "Couldn't get power register\n");
 278                         return PTR_ERR(control_phy->power);
 279                 }
 280         }
 281
 282         if (control_phy->type == OMAP_CTRL_TYPE_PIPE3) {
 283                 control_phy->sys_clk = devm_clk_get(control_phy->dev,
 284                         "sys_clkin");
 285                 if (IS_ERR(control_phy->sys_clk)) {
 286                         pr_err("%s: unable to get sys_clkin\n", __func__);
 287                         return -EINVAL;
 288                 }
 289         }
 290
 291         dev_set_drvdata(control_phy->dev, control_phy);
 292
 293         return 0;
 294 }
 295
 296 static struct platform_driver omap_control_phy_driver = {
 297         .probe          = omap_control_phy_probe,
 298         .driver         = {
 299                 .name   = "omap-control-phy",
 300                 .owner  = THIS_MODULE,
 301                 .of_match_table = of_match_ptr(omap_control_phy_id_table),
 302         },
 303 };
 304
 305 static int __init omap_control_phy_init(void)
 306 {
 307         return platform_driver_register(&omap_control_phy_driver);
 308 }
 309 subsys_initcall(omap_control_phy_init);
 310
 311 static void __exit omap_control_phy_exit(void)
 312 {
 313         platform_driver_unregister(&omap_control_phy_driver);
 314 }
 315 module_exit(omap_control_phy_exit);
 316
 317 MODULE_ALIAS("platform: omap_control_phy");
 318 MODULE_AUTHOR("Texas Instruments Inc.");
 319 MODULE_DESCRIPTION("OMAP Control Module PHY Driver");
 320 MODULE_LICENSE("GPL v2");