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/err.h>
  24 #include <linux/io.h>
  25 #include <linux/clk.h>
  26 #include <linux/usb/omap_control_usb.h>
  27
  28 static struct omap_control_usb *control_usb;
  29
  30 /**
  31  * omap_get_control_dev - returns the device pointer for this control device
  32  *
  33  * This API should be called to get the device pointer for this control
  34  * module device. This device pointer should be used for called other
  35  * exported API's in this driver.
  36  *
  37  * To be used by PHY driver and glue driver.
  38  */
  39 struct device *omap_get_control_dev(void)
  40 {
  41         if (!control_usb)
  42                 return ERR_PTR(-ENODEV);
  43
  44         return control_usb->dev;
  45 }
  46 EXPORT_SYMBOL_GPL(omap_get_control_dev);
  47
  48 /**
  49  * omap_control_usb3_phy_power - power on/off the serializer using control
  50  *      module
  51  * @dev: the control module device
  52  * @on: 0 to off and 1 to on based on powering on or off the PHY
  53  *
  54  * usb3 PHY driver should call this API to power on or off the PHY.
  55  */
  56 void omap_control_usb3_phy_power(struct device *dev, bool on)
  57 {
  58         u32 val;
  59         unsigned long rate;
  60         struct omap_control_usb *control_usb = dev_get_drvdata(dev);
  61
  62         if (control_usb->type != OMAP_CTRL_DEV_TYPE2)
  63                 return;
  64
  65         rate = clk_get_rate(control_usb->sys_clk);
  66         rate = rate/1000000;
  67
  68         val = readl(control_usb->phy_power);
  69
  70         if (on) {
  71                 val &= ~(OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK |
  72                         OMAP_CTRL_USB_PWRCTL_CLK_FREQ_MASK);
  73                 val |= OMAP_CTRL_USB3_PHY_TX_RX_POWERON <<
  74                         OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
  75                 val |= rate << OMAP_CTRL_USB_PWRCTL_CLK_FREQ_SHIFT;
  76         } else {
  77                 val &= ~OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK;
  78                 val |= OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF <<
  79                         OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
  80         }
  81
  82         writel(val, control_usb->phy_power);
  83 }
  84 EXPORT_SYMBOL_GPL(omap_control_usb3_phy_power);
  85
  86 /**
  87  * omap_control_usb_phy_power - power on/off the phy using control module reg
  88  * @dev: the control module device
  89  * @on: 0 or 1, based on powering on or off the PHY
  90  */
  91 void omap_control_usb_phy_power(struct device *dev, int on)
  92 {
  93         u32 val;
  94         struct omap_control_usb *control_usb = dev_get_drvdata(dev);
  95
  96         val = readl(control_usb->dev_conf);
  97
  98         if (on)
  99                 val &= ~OMAP_CTRL_DEV_PHY_PD;
 100         else
 101                 val |= OMAP_CTRL_DEV_PHY_PD;
 102
 103         writel(val, control_usb->dev_conf);
 104 }
 105 EXPORT_SYMBOL_GPL(omap_control_usb_phy_power);
 106
 107 /**
 108  * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
 109  * @ctrl_usb: struct omap_control_usb *
 110  *
 111  * Writes to the mailbox register to notify the usb core that a usb
 112  * device has been connected.
 113  */
 114 static void omap_control_usb_host_mode(struct omap_control_usb *ctrl_usb)
 115 {
 116         u32 val;
 117
 118         val = readl(ctrl_usb->otghs_control);
 119         val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND);
 120         val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;
 121         writel(val, ctrl_usb->otghs_control);
 122 }
 123
 124 /**
 125  * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
 126  * impedance
 127  * @ctrl_usb: struct omap_control_usb *
 128  *
 129  * Writes to the mailbox register to notify the usb core that it has been
 130  * connected to a usb host.
 131  */
 132 static void omap_control_usb_device_mode(struct omap_control_usb *ctrl_usb)
 133 {
 134         u32 val;
 135
 136         val = readl(ctrl_usb->otghs_control);
 137         val &= ~OMAP_CTRL_DEV_SESSEND;
 138         val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID |
 139                 OMAP_CTRL_DEV_VBUSVALID;
 140         writel(val, ctrl_usb->otghs_control);
 141 }
 142
 143 /**
 144  * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
 145  * impedance
 146  * @ctrl_usb: struct omap_control_usb *
 147  *
 148  * Writes to the mailbox register to notify the usb core it's now in
 149  * disconnected state.
 150  */
 151 static void omap_control_usb_set_sessionend(struct omap_control_usb *ctrl_usb)
 152 {
 153         u32 val;
 154
 155         val = readl(ctrl_usb->otghs_control);
 156         val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID);
 157         val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND;
 158         writel(val, ctrl_usb->otghs_control);
 159 }
 160
 161 /**
 162  * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode
 163  * or device mode or to denote disconnected state
 164  * @dev: the control module device
 165  * @mode: The mode to which usb should be configured
 166  *
 167  * This is an API to write to the mailbox register to notify the usb core that
 168  * a usb device has been connected.
 169  */
 170 void omap_control_usb_set_mode(struct device *dev,
 171         enum omap_control_usb_mode mode)
 172 {
 173         struct omap_control_usb *ctrl_usb;
 174
 175         if (IS_ERR(dev) || control_usb->type != OMAP_CTRL_DEV_TYPE1)
 176                 return;
 177
 178         ctrl_usb = dev_get_drvdata(dev);
 179
 180         switch (mode) {
 181         case USB_MODE_HOST:
 182                 omap_control_usb_host_mode(ctrl_usb);
 183                 break;
 184         case USB_MODE_DEVICE:
 185                 omap_control_usb_device_mode(ctrl_usb);
 186                 break;
 187         case USB_MODE_DISCONNECT:
 188                 omap_control_usb_set_sessionend(ctrl_usb);
 189                 break;
 190         default:
 191                 dev_vdbg(dev, "invalid omap control usb mode\n");
 192         }
 193 }
 194 EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);
 195
 196 static int omap_control_usb_probe(struct platform_device *pdev)
 197 {
 198         struct resource *res;
 199         struct device_node *np = pdev->dev.of_node;
 200         struct omap_control_usb_platform_data *pdata =
 201                         dev_get_platdata(&pdev->dev);
 202
 203         control_usb = devm_kzalloc(&pdev->dev, sizeof(*control_usb),
 204                 GFP_KERNEL);
 205         if (!control_usb) {
 206                 dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
 207                 return -ENOMEM;
 208         }
 209
 210         if (np) {
 211                 of_property_read_u32(np, "ti,type", &control_usb->type);
 212         } else if (pdata) {
 213                 control_usb->type = pdata->type;
 214         } else {
 215                 dev_err(&pdev->dev, "no pdata present\n");
 216                 return -EINVAL;
 217         }
 218
 219         control_usb->dev        = &pdev->dev;
 220
 221         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 222                 "control_dev_conf");
 223         control_usb->dev_conf = devm_ioremap_resource(&pdev->dev, res);
 224         if (IS_ERR(control_usb->dev_conf))
 225                 return PTR_ERR(control_usb->dev_conf);
 226
 227         if (control_usb->type == OMAP_CTRL_DEV_TYPE1) {
 228                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 229                         "otghs_control");
 230                 control_usb->otghs_control = devm_ioremap_resource(
 231                         &pdev->dev, res);
 232                 if (IS_ERR(control_usb->otghs_control))
 233                         return PTR_ERR(control_usb->otghs_control);
 234         }
 235
 236         if (control_usb->type == OMAP_CTRL_DEV_TYPE2) {
 237                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 238                         "phy_power_usb");
 239                 control_usb->phy_power = devm_ioremap_resource(
 240                         &pdev->dev, res);
 241                 if (IS_ERR(control_usb->phy_power))
 242                         return PTR_ERR(control_usb->phy_power);
 243
 244                 control_usb->sys_clk = devm_clk_get(control_usb->dev,
 245                         "sys_clkin");
 246                 if (IS_ERR(control_usb->sys_clk)) {
 247                         pr_err("%s: unable to get sys_clkin\n", __func__);
 248                         return -EINVAL;
 249                 }
 250         }
 251
 252
 253         dev_set_drvdata(control_usb->dev, control_usb);
 254
 255         return 0;
 256 }
 257
 258 #ifdef CONFIG_OF
 259 static const struct of_device_id omap_control_usb_id_table[] = {
 260         { .compatible = "ti,omap-control-usb" },
 261         {}
 262 };
 263 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
 264 #endif
 265
 266 static struct platform_driver omap_control_usb_driver = {
 267         .probe          = omap_control_usb_probe,
 268         .driver         = {
 269                 .name   = "omap-control-usb",
 270                 .owner  = THIS_MODULE,
 271                 .of_match_table = of_match_ptr(omap_control_usb_id_table),
 272         },
 273 };
 274
 275 static int __init omap_control_usb_init(void)
 276 {
 277         return platform_driver_register(&omap_control_usb_driver);
 278 }
 279 subsys_initcall(omap_control_usb_init);
 280
 281 static void __exit omap_control_usb_exit(void)
 282 {
 283         platform_driver_unregister(&omap_control_usb_driver);
 284 }
 285 module_exit(omap_control_usb_exit);
 286
 287 MODULE_ALIAS("platform: omap_control_usb");
 288 MODULE_AUTHOR("Texas Instruments Inc.");
 289 MODULE_DESCRIPTION("OMAP Control Module USB Driver");
 290 MODULE_LICENSE("GPL v2");