drivers/usb/phy/phy-omap-control.c

   1 /*
   2  * omap-control-usb.c - The USB 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/usb/omap_control_usb.h>
  28
  29 /**
  30  * omap_control_usb_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_usb_phy_power(struct device *dev, int on)
  35 {
  36         u32 val;
  37         unsigned long rate;
  38         struct omap_control_usb *control_usb;
  39
  40         if (IS_ERR(dev) || !dev) {
  41                 pr_err("%s: invalid device\n", __func__);
  42                 return;
  43         }
  44
  45         control_usb = dev_get_drvdata(dev);
  46         if (!control_usb) {
  47                 dev_err(dev, "%s: invalid control usb device\n", __func__);
  48                 return;
  49         }
  50
  51         if (control_usb->type == OMAP_CTRL_TYPE_OTGHS)
  52                 return;
  53
  54         val = readl(control_usb->power);
  55
  56         switch (control_usb->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_usb->sys_clk);
  66                 rate = rate/1000000;
  67
  68                 if (on) {
  69                         val &= ~(OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK |
  70                                         OMAP_CTRL_USB_PWRCTL_CLK_FREQ_MASK);
  71                         val |= OMAP_CTRL_USB3_PHY_TX_RX_POWERON <<
  72                                 OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
  73                         val |= rate << OMAP_CTRL_USB_PWRCTL_CLK_FREQ_SHIFT;
  74                 } else {
  75                         val &= ~OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK;
  76                         val |= OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF <<
  77                                 OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
  78                 }
  79                 break;
  80
  81         case OMAP_CTRL_TYPE_DRA7USB2:
  82                 if (on)
  83                         val &= ~OMAP_CTRL_USB2_PHY_PD;
  84                 else
  85                         val |= OMAP_CTRL_USB2_PHY_PD;
  86                 break;
  87
  88         case OMAP_CTRL_TYPE_AM437USB2:
  89                 if (on) {
  90                         val &= ~(AM437X_CTRL_USB2_PHY_PD |
  91                                         AM437X_CTRL_USB2_OTG_PD);
  92                         val |= (AM437X_CTRL_USB2_OTGVDET_EN |
  93                                         AM437X_CTRL_USB2_OTGSESSEND_EN);
  94                 } else {
  95                         val &= ~(AM437X_CTRL_USB2_OTGVDET_EN |
  96                                         AM437X_CTRL_USB2_OTGSESSEND_EN);
  97                         val |= (AM437X_CTRL_USB2_PHY_PD |
  98                                          AM437X_CTRL_USB2_OTG_PD);
  99                 }
 100                 break;
 101         default:
 102                 dev_err(dev, "%s: type %d not recognized\n",
 103                                         __func__, control_usb->type);
 104                 break;
 105         }
 106
 107         writel(val, control_usb->power);
 108 }
 109 EXPORT_SYMBOL_GPL(omap_control_usb_phy_power);
 110
 111 /**
 112  * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
 113  * @ctrl_usb: struct omap_control_usb *
 114  *
 115  * Writes to the mailbox register to notify the usb core that a usb
 116  * device has been connected.
 117  */
 118 static void omap_control_usb_host_mode(struct omap_control_usb *ctrl_usb)
 119 {
 120         u32 val;
 121
 122         val = readl(ctrl_usb->otghs_control);
 123         val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND);
 124         val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;
 125         writel(val, ctrl_usb->otghs_control);
 126 }
 127
 128 /**
 129  * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
 130  * impedance
 131  * @ctrl_usb: struct omap_control_usb *
 132  *
 133  * Writes to the mailbox register to notify the usb core that it has been
 134  * connected to a usb host.
 135  */
 136 static void omap_control_usb_device_mode(struct omap_control_usb *ctrl_usb)
 137 {
 138         u32 val;
 139
 140         val = readl(ctrl_usb->otghs_control);
 141         val &= ~OMAP_CTRL_DEV_SESSEND;
 142         val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID |
 143                 OMAP_CTRL_DEV_VBUSVALID;
 144         writel(val, ctrl_usb->otghs_control);
 145 }
 146
 147 /**
 148  * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
 149  * impedance
 150  * @ctrl_usb: struct omap_control_usb *
 151  *
 152  * Writes to the mailbox register to notify the usb core it's now in
 153  * disconnected state.
 154  */
 155 static void omap_control_usb_set_sessionend(struct omap_control_usb *ctrl_usb)
 156 {
 157         u32 val;
 158
 159         val = readl(ctrl_usb->otghs_control);
 160         val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID);
 161         val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND;
 162         writel(val, ctrl_usb->otghs_control);
 163 }
 164
 165 /**
 166  * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode
 167  * or device mode or to denote disconnected state
 168  * @dev: the control module device
 169  * @mode: The mode to which usb should be configured
 170  *
 171  * This is an API to write to the mailbox register to notify the usb core that
 172  * a usb device has been connected.
 173  */
 174 void omap_control_usb_set_mode(struct device *dev,
 175         enum omap_control_usb_mode mode)
 176 {
 177         struct omap_control_usb *ctrl_usb;
 178
 179         if (IS_ERR(dev) || !dev)
 180                 return;
 181
 182         ctrl_usb = dev_get_drvdata(dev);
 183
 184         if (!ctrl_usb) {
 185                 dev_err(dev, "Invalid control usb device\n");
 186                 return;
 187         }
 188
 189         if (ctrl_usb->type != OMAP_CTRL_TYPE_OTGHS)
 190                 return;
 191
 192         switch (mode) {
 193         case USB_MODE_HOST:
 194                 omap_control_usb_host_mode(ctrl_usb);
 195                 break;
 196         case USB_MODE_DEVICE:
 197                 omap_control_usb_device_mode(ctrl_usb);
 198                 break;
 199         case USB_MODE_DISCONNECT:
 200                 omap_control_usb_set_sessionend(ctrl_usb);
 201                 break;
 202         default:
 203                 dev_vdbg(dev, "invalid omap control usb mode\n");
 204         }
 205 }
 206 EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);
 207
 208 #ifdef CONFIG_OF
 209
 210 static const enum omap_control_usb_type otghs_data = OMAP_CTRL_TYPE_OTGHS;
 211 static const enum omap_control_usb_type usb2_data = OMAP_CTRL_TYPE_USB2;
 212 static const enum omap_control_usb_type pipe3_data = OMAP_CTRL_TYPE_PIPE3;
 213 static const enum omap_control_usb_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2;
 214 static const enum omap_control_usb_type am437usb2_data = OMAP_CTRL_TYPE_AM437USB2;
 215
 216 static const struct of_device_id omap_control_usb_id_table[] = {
 217         {
 218                 .compatible = "ti,control-phy-otghs",
 219                 .data = &otghs_data,
 220         },
 221         {
 222                 .compatible = "ti,control-phy-usb2",
 223                 .data = &usb2_data,
 224         },
 225         {
 226                 .compatible = "ti,control-phy-pipe3",
 227                 .data = &pipe3_data,
 228         },
 229         {
 230                 .compatible = "ti,control-phy-dra7usb2",
 231                 .data = &dra7usb2_data,
 232         },
 233         {
 234                 .compatible = "ti,control-phy-am437usb2",
 235                 .data = &am437usb2_data,
 236         },
 237         {},
 238 };
 239 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
 240 #endif
 241
 242
 243 static int omap_control_usb_probe(struct platform_device *pdev)
 244 {
 245         struct resource *res;
 246         const struct of_device_id *of_id;
 247         struct omap_control_usb *control_usb;
 248
 249         of_id = of_match_device(of_match_ptr(omap_control_usb_id_table),
 250                                                                 &pdev->dev);
 251         if (!of_id)
 252                 return -EINVAL;
 253
 254         control_usb = devm_kzalloc(&pdev->dev, sizeof(*control_usb),
 255                 GFP_KERNEL);
 256         if (!control_usb) {
 257                 dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
 258                 return -ENOMEM;
 259         }
 260
 261         control_usb->dev = &pdev->dev;
 262         control_usb->type = *(enum omap_control_usb_type *)of_id->data;
 263
 264         if (control_usb->type == OMAP_CTRL_TYPE_OTGHS) {
 265                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 266                         "otghs_control");
 267                 control_usb->otghs_control = devm_ioremap_resource(
 268                         &pdev->dev, res);
 269                 if (IS_ERR(control_usb->otghs_control))
 270                         return PTR_ERR(control_usb->otghs_control);
 271         } else {
 272                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 273                                 "power");
 274                 control_usb->power = devm_ioremap_resource(&pdev->dev, res);
 275                 if (IS_ERR(control_usb->power)) {
 276                         dev_err(&pdev->dev, "Couldn't get power register\n");
 277                         return PTR_ERR(control_usb->power);
 278                 }
 279         }
 280
 281         if (control_usb->type == OMAP_CTRL_TYPE_PIPE3) {
 282                 control_usb->sys_clk = devm_clk_get(control_usb->dev,
 283                         "sys_clkin");
 284                 if (IS_ERR(control_usb->sys_clk)) {
 285                         pr_err("%s: unable to get sys_clkin\n", __func__);
 286                         return -EINVAL;
 287                 }
 288         }
 289
 290         dev_set_drvdata(control_usb->dev, control_usb);
 291
 292         return 0;
 293 }
 294
 295 static struct platform_driver omap_control_usb_driver = {
 296         .probe          = omap_control_usb_probe,
 297         .driver         = {
 298                 .name   = "omap-control-usb",
 299                 .owner  = THIS_MODULE,
 300                 .of_match_table = of_match_ptr(omap_control_usb_id_table),
 301         },
 302 };
 303
 304 static int __init omap_control_usb_init(void)
 305 {
 306         return platform_driver_register(&omap_control_usb_driver);
 307 }
 308 subsys_initcall(omap_control_usb_init);
 309
 310 static void __exit omap_control_usb_exit(void)
 311 {
 312         platform_driver_unregister(&omap_control_usb_driver);
 313 }
 314 module_exit(omap_control_usb_exit);
 315
 316 MODULE_ALIAS("platform: omap_control_usb");
 317 MODULE_AUTHOR("Texas Instruments Inc.");
 318 MODULE_DESCRIPTION("OMAP Control Module USB Driver");
 319 MODULE_LICENSE("GPL v2");