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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * omap-control-phy.c - The PHY part of control module.
   4  *
   5  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
   6  * Author: Kishon Vijay Abraham I <[email protected]>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/slab.h>
  12 #include <linux/of.h>
  13 #include <linux/of_device.h>
  14 #include <linux/err.h>
  15 #include <linux/io.h>
  16 #include <linux/clk.h>
  17 #include <linux/phy/omap_control_phy.h>
  18
  19 /**
  20  * omap_control_pcie_pcs - set the PCS delay count
  21  * @dev: the control module device
  22  * @delay: 8 bit delay value
  23  */
  24 void omap_control_pcie_pcs(struct device *dev, u8 delay)
  25 {
  26         u32 val;
  27         struct omap_control_phy *control_phy;
  28
  29         if (IS_ERR_OR_NULL(dev)) {
  30                 pr_err("%s: invalid device\n", __func__);
  31                 return;
  32         }
  33
  34         control_phy = dev_get_drvdata(dev);
  35         if (!control_phy) {
  36                 dev_err(dev, "%s: invalid control phy device\n", __func__);
  37                 return;
  38         }
  39
  40         if (control_phy->type != OMAP_CTRL_TYPE_PCIE) {
  41                 dev_err(dev, "%s: unsupported operation\n", __func__);
  42                 return;
  43         }
  44
  45         val = readl(control_phy->pcie_pcs);
  46         val &= ~(OMAP_CTRL_PCIE_PCS_MASK <<
  47                 OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT);
  48         val |= (delay << OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT);
  49         writel(val, control_phy->pcie_pcs);
  50 }
  51 EXPORT_SYMBOL_GPL(omap_control_pcie_pcs);
  52
  53 /**
  54  * omap_control_phy_power - power on/off the phy using control module reg
  55  * @dev: the control module device
  56  * @on: 0 or 1, based on powering on or off the PHY
  57  */
  58 void omap_control_phy_power(struct device *dev, int on)
  59 {
  60         u32 val;
  61         unsigned long rate;
  62         struct omap_control_phy *control_phy;
  63
  64         if (IS_ERR_OR_NULL(dev)) {
  65                 pr_err("%s: invalid device\n", __func__);
  66                 return;
  67         }
  68
  69         control_phy = dev_get_drvdata(dev);
  70         if (!control_phy) {
  71                 dev_err(dev, "%s: invalid control phy device\n", __func__);
  72                 return;
  73         }
  74
  75         if (control_phy->type == OMAP_CTRL_TYPE_OTGHS)
  76                 return;
  77
  78         val = readl(control_phy->power);
  79
  80         switch (control_phy->type) {
  81         case OMAP_CTRL_TYPE_USB2:
  82                 if (on)
  83                         val &= ~OMAP_CTRL_DEV_PHY_PD;
  84                 else
  85                         val |= OMAP_CTRL_DEV_PHY_PD;
  86                 break;
  87
  88         case OMAP_CTRL_TYPE_PCIE:
  89         case OMAP_CTRL_TYPE_PIPE3:
  90                 rate = clk_get_rate(control_phy->sys_clk);
  91                 rate = rate/1000000;
  92
  93                 if (on) {
  94                         val &= ~(OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK |
  95                                 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK);
  96                         val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON <<
  97                                 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
  98                         val |= rate <<
  99                                 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT;
 100                 } else {
 101                         val &= ~OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK;
 102                         val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF <<
 103                                 OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
 104                 }
 105                 break;
 106
 107         case OMAP_CTRL_TYPE_DRA7USB2:
 108                 if (on)
 109                         val &= ~OMAP_CTRL_USB2_PHY_PD;
 110                 else
 111                         val |= OMAP_CTRL_USB2_PHY_PD;
 112                 break;
 113
 114         case OMAP_CTRL_TYPE_AM437USB2:
 115                 if (on) {
 116                         val &= ~(AM437X_CTRL_USB2_PHY_PD |
 117                                         AM437X_CTRL_USB2_OTG_PD);
 118                         val |= (AM437X_CTRL_USB2_OTGVDET_EN |
 119                                         AM437X_CTRL_USB2_OTGSESSEND_EN);
 120                 } else {
 121                         val &= ~(AM437X_CTRL_USB2_OTGVDET_EN |
 122                                         AM437X_CTRL_USB2_OTGSESSEND_EN);
 123                         val |= (AM437X_CTRL_USB2_PHY_PD |
 124                                          AM437X_CTRL_USB2_OTG_PD);
 125                 }
 126                 break;
 127         default:
 128                 dev_err(dev, "%s: type %d not recognized\n",
 129                         __func__, control_phy->type);
 130                 break;
 131         }
 132
 133         writel(val, control_phy->power);
 134 }
 135 EXPORT_SYMBOL_GPL(omap_control_phy_power);
 136
 137 /**
 138  * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
 139  * @ctrl_phy: struct omap_control_phy *
 140  *
 141  * Writes to the mailbox register to notify the usb core that a usb
 142  * device has been connected.
 143  */
 144 static void omap_control_usb_host_mode(struct omap_control_phy *ctrl_phy)
 145 {
 146         u32 val;
 147
 148         val = readl(ctrl_phy->otghs_control);
 149         val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND);
 150         val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;
 151         writel(val, ctrl_phy->otghs_control);
 152 }
 153
 154 /**
 155  * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
 156  * impedance
 157  * @ctrl_phy: struct omap_control_phy *
 158  *
 159  * Writes to the mailbox register to notify the usb core that it has been
 160  * connected to a usb host.
 161  */
 162 static void omap_control_usb_device_mode(struct omap_control_phy *ctrl_phy)
 163 {
 164         u32 val;
 165
 166         val = readl(ctrl_phy->otghs_control);
 167         val &= ~OMAP_CTRL_DEV_SESSEND;
 168         val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID |
 169                 OMAP_CTRL_DEV_VBUSVALID;
 170         writel(val, ctrl_phy->otghs_control);
 171 }
 172
 173 /**
 174  * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
 175  * impedance
 176  * @ctrl_phy: struct omap_control_phy *
 177  *
 178  * Writes to the mailbox register to notify the usb core it's now in
 179  * disconnected state.
 180  */
 181 static void omap_control_usb_set_sessionend(struct omap_control_phy *ctrl_phy)
 182 {
 183         u32 val;
 184
 185         val = readl(ctrl_phy->otghs_control);
 186         val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID);
 187         val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND;
 188         writel(val, ctrl_phy->otghs_control);
 189 }
 190
 191 /**
 192  * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode
 193  * or device mode or to denote disconnected state
 194  * @dev: the control module device
 195  * @mode: The mode to which usb should be configured
 196  *
 197  * This is an API to write to the mailbox register to notify the usb core that
 198  * a usb device has been connected.
 199  */
 200 void omap_control_usb_set_mode(struct device *dev,
 201         enum omap_control_usb_mode mode)
 202 {
 203         struct omap_control_phy *ctrl_phy;
 204
 205         if (IS_ERR_OR_NULL(dev))
 206                 return;
 207
 208         ctrl_phy = dev_get_drvdata(dev);
 209         if (!ctrl_phy) {
 210                 dev_err(dev, "Invalid control phy device\n");
 211                 return;
 212         }
 213
 214         if (ctrl_phy->type != OMAP_CTRL_TYPE_OTGHS)
 215                 return;
 216
 217         switch (mode) {
 218         case USB_MODE_HOST:
 219                 omap_control_usb_host_mode(ctrl_phy);
 220                 break;
 221         case USB_MODE_DEVICE:
 222                 omap_control_usb_device_mode(ctrl_phy);
 223                 break;
 224         case USB_MODE_DISCONNECT:
 225                 omap_control_usb_set_sessionend(ctrl_phy);
 226                 break;
 227         default:
 228                 dev_vdbg(dev, "invalid omap control usb mode\n");
 229         }
 230 }
 231 EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);
 232
 233 static const enum omap_control_phy_type otghs_data = OMAP_CTRL_TYPE_OTGHS;
 234 static const enum omap_control_phy_type usb2_data = OMAP_CTRL_TYPE_USB2;
 235 static const enum omap_control_phy_type pipe3_data = OMAP_CTRL_TYPE_PIPE3;
 236 static const enum omap_control_phy_type pcie_data = OMAP_CTRL_TYPE_PCIE;
 237 static const enum omap_control_phy_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2;
 238 static const enum omap_control_phy_type am437usb2_data = OMAP_CTRL_TYPE_AM437USB2;
 239
 240 static const struct of_device_id omap_control_phy_id_table[] = {
 241         {
 242                 .compatible = "ti,control-phy-otghs",
 243                 .data = &otghs_data,
 244         },
 245         {
 246                 .compatible = "ti,control-phy-usb2",
 247                 .data = &usb2_data,
 248         },
 249         {
 250                 .compatible = "ti,control-phy-pipe3",
 251                 .data = &pipe3_data,
 252         },
 253         {
 254                 .compatible = "ti,control-phy-pcie",
 255                 .data = &pcie_data,
 256         },
 257         {
 258                 .compatible = "ti,control-phy-usb2-dra7",
 259                 .data = &dra7usb2_data,
 260         },
 261         {
 262                 .compatible = "ti,control-phy-usb2-am437",
 263                 .data = &am437usb2_data,
 264         },
 265         {},
 266 };
 267 MODULE_DEVICE_TABLE(of, omap_control_phy_id_table);
 268
 269 static int omap_control_phy_probe(struct platform_device *pdev)
 270 {
 271         const struct of_device_id *of_id;
 272         struct omap_control_phy *control_phy;
 273
 274         of_id = of_match_device(omap_control_phy_id_table, &pdev->dev);
 275         if (!of_id)
 276                 return -EINVAL;
 277
 278         control_phy = devm_kzalloc(&pdev->dev, sizeof(*control_phy),
 279                 GFP_KERNEL);
 280         if (!control_phy)
 281                 return -ENOMEM;
 282
 283         control_phy->dev = &pdev->dev;
 284         control_phy->type = *(enum omap_control_phy_type *)of_id->data;
 285
 286         if (control_phy->type == OMAP_CTRL_TYPE_OTGHS) {
 287                 control_phy->otghs_control =
 288                         devm_platform_ioremap_resource_byname(pdev, "otghs_control");
 289                 if (IS_ERR(control_phy->otghs_control))
 290                         return PTR_ERR(control_phy->otghs_control);
 291         } else {
 292                 control_phy->power =
 293                         devm_platform_ioremap_resource_byname(pdev, "power");
 294                 if (IS_ERR(control_phy->power)) {
 295                         dev_err(&pdev->dev, "Couldn't get power register\n");
 296                         return PTR_ERR(control_phy->power);
 297                 }
 298         }
 299
 300         if (control_phy->type == OMAP_CTRL_TYPE_PIPE3 ||
 301             control_phy->type == OMAP_CTRL_TYPE_PCIE) {
 302                 control_phy->sys_clk = devm_clk_get(control_phy->dev,
 303                         "sys_clkin");
 304                 if (IS_ERR(control_phy->sys_clk)) {
 305                         pr_err("%s: unable to get sys_clkin\n", __func__);
 306                         return -EINVAL;
 307                 }
 308         }
 309
 310         if (control_phy->type == OMAP_CTRL_TYPE_PCIE) {
 311                 control_phy->pcie_pcs =
 312                         devm_platform_ioremap_resource_byname(pdev, "pcie_pcs");
 313                 if (IS_ERR(control_phy->pcie_pcs))
 314                         return PTR_ERR(control_phy->pcie_pcs);
 315         }
 316
 317         dev_set_drvdata(control_phy->dev, control_phy);
 318
 319         return 0;
 320 }
 321
 322 static struct platform_driver omap_control_phy_driver = {
 323         .probe          = omap_control_phy_probe,
 324         .driver         = {
 325                 .name   = "omap-control-phy",
 326                 .of_match_table = omap_control_phy_id_table,
 327         },
 328 };
 329
 330 static int __init omap_control_phy_init(void)
 331 {
 332         return platform_driver_register(&omap_control_phy_driver);
 333 }
 334 subsys_initcall(omap_control_phy_init);
 335
 336 static void __exit omap_control_phy_exit(void)
 337 {
 338         platform_driver_unregister(&omap_control_phy_driver);
 339 }
 340 module_exit(omap_control_phy_exit);
 341
 342 MODULE_ALIAS("platform:omap_control_phy");
 343 MODULE_AUTHOR("Texas Instruments Inc.");
 344 MODULE_DESCRIPTION("OMAP Control Module PHY Driver");
 345 MODULE_LICENSE("GPL v2");