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