drivers/usb/host/ehci-omap.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * ehci-omap.c - driver for USBHOST on OMAP3/4 processors
   4  *
   5  * Bus Glue for the EHCI controllers in OMAP3/4
   6  * Tested on several OMAP3 boards, and OMAP4 Pandaboard
   7  *
   8  * Copyright (C) 2007-2013 Texas Instruments, Inc.
   9  *      Author: Vikram Pandita <vikram.pandita@ti.com>
  10  *      Author: Anand Gadiyar <gadiyar@ti.com>
  11  *      Author: Keshava Munegowda <keshava_mgowda@ti.com>
  12  *      Author: Roger Quadros <rogerq@ti.com>
  13  *
  14  * Copyright (C) 2009 Nokia Corporation
  15  *      Contact: Felipe Balbi <felipe.balbi@nokia.com>
  16  *
  17  * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/io.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/slab.h>
  25 #include <linux/usb/ulpi.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/gpio.h>
  28 #include <linux/clk.h>
  29 #include <linux/usb.h>
  30 #include <linux/usb/hcd.h>
  31 #include <linux/of.h>
  32 #include <linux/dma-mapping.h>
  33
  34 #include "ehci.h"
  35
  36 #include <linux/platform_data/usb-omap.h>
  37
  38 /* EHCI Register Set */
  39 #define EHCI_INSNREG04                                  (0xA0)
  40 #define EHCI_INSNREG04_DISABLE_UNSUSPEND                (1 << 5)
  41 #define EHCI_INSNREG05_ULPI                             (0xA4)
  42 #define EHCI_INSNREG05_ULPI_CONTROL_SHIFT               31
  43 #define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT               24
  44 #define EHCI_INSNREG05_ULPI_OPSEL_SHIFT                 22
  45 #define EHCI_INSNREG05_ULPI_REGADD_SHIFT                16
  46 #define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT             8
  47 #define EHCI_INSNREG05_ULPI_WRDATA_SHIFT                0
  48
  49 #define DRIVER_DESC "OMAP-EHCI Host Controller driver"
  50
  51 static const char hcd_name[] = "ehci-omap";
  52
  53 /*-------------------------------------------------------------------------*/
  54
  55 struct omap_hcd {
  56         struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */
  57         int nports;
  58 };
  59
  60 static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
  61 {
  62         __raw_writel(val, base + reg);
  63 }
  64
  65 static inline u32 ehci_read(void __iomem *base, u32 reg)
  66 {
  67         return __raw_readl(base + reg);
  68 }
  69
  70 /* configure so an HC device and id are always provided */
  71 /* always called with process context; sleeping is OK */
  72
  73 static struct hc_driver __read_mostly ehci_omap_hc_driver;
  74
  75 static const struct ehci_driver_overrides ehci_omap_overrides __initconst = {
  76         .extra_priv_size = sizeof(struct omap_hcd),
  77 };
  78
  79 /**
  80  * ehci_hcd_omap_probe - initialize TI-based HCDs
  81  *
  82  * Allocates basic resources for this USB host controller, and
  83  * then invokes the start() method for the HCD associated with it
  84  * through the hotplug entry's driver_data.
  85  */
  86 static int ehci_hcd_omap_probe(struct platform_device *pdev)
  87 {
  88         struct device *dev = &pdev->dev;
  89         struct usbhs_omap_platform_data *pdata = dev_get_platdata(dev);
  90         struct resource *res;
  91         struct usb_hcd  *hcd;
  92         void __iomem *regs;
  93         int ret;
  94         int irq;
  95         int i;
  96         struct omap_hcd *omap;
  97
  98         if (usb_disabled())
  99                 return -ENODEV;
 100
 101         if (!dev->parent) {
 102                 dev_err(dev, "Missing parent device\n");
 103                 return -ENODEV;
 104         }
 105
 106         /* For DT boot, get platform data from parent. i.e. usbhshost */
 107         if (dev->of_node) {
 108                 pdata = dev_get_platdata(dev->parent);
 109                 dev->platform_data = pdata;
 110         }
 111
 112         if (!pdata) {
 113                 dev_err(dev, "Missing platform data\n");
 114                 return -ENODEV;
 115         }
 116
 117         irq = platform_get_irq(pdev, 0);
 118         if (irq < 0) {
 119                 dev_err(dev, "EHCI irq failed: %d\n", irq);
 120                 return irq;
 121         }
 122
 123         res =  platform_get_resource(pdev, IORESOURCE_MEM, 0);
 124         regs = devm_ioremap_resource(dev, res);
 125         if (IS_ERR(regs))
 126                 return PTR_ERR(regs);
 127
 128         /*
 129          * Right now device-tree probed devices don't get dma_mask set.
 130          * Since shared usb code relies on it, set it here for now.
 131          * Once we have dma capability bindings this can go away.
 132          */
 133         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
 134         if (ret)
 135                 return ret;
 136
 137         ret = -ENODEV;
 138         hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
 139                         dev_name(dev));
 140         if (!hcd) {
 141                 dev_err(dev, "Failed to create HCD\n");
 142                 return -ENOMEM;
 143         }
 144
 145         hcd->rsrc_start = res->start;
 146         hcd->rsrc_len = resource_size(res);
 147         hcd->regs = regs;
 148         hcd_to_ehci(hcd)->caps = regs;
 149
 150         omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
 151         omap->nports = pdata->nports;
 152
 153         platform_set_drvdata(pdev, hcd);
 154
 155         /* get the PHY devices if needed */
 156         for (i = 0 ; i < omap->nports ; i++) {
 157                 struct usb_phy *phy;
 158
 159                 /* get the PHY device */
 160                 if (dev->of_node)
 161                         phy = devm_usb_get_phy_by_phandle(dev, "phys", i);
 162                 else
 163                         phy = devm_usb_get_phy_dev(dev, i);
 164                 if (IS_ERR(phy)) {
 165                         /* Don't bail out if PHY is not absolutely necessary */
 166                         if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY)
 167                                 continue;
 168
 169                         ret = PTR_ERR(phy);
 170                         if (ret != -EPROBE_DEFER)
 171                                 dev_err(dev, "Can't get PHY for port %d: %d\n",
 172                                         i, ret);
 173                         goto err_phy;
 174                 }
 175
 176                 omap->phy[i] = phy;
 177
 178                 if (pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY) {
 179                         usb_phy_init(omap->phy[i]);
 180                         /* bring PHY out of suspend */
 181                         usb_phy_set_suspend(omap->phy[i], 0);
 182                 }
 183         }
 184
 185         pm_runtime_enable(dev);
 186         pm_runtime_get_sync(dev);
 187
 188         /*
 189          * An undocumented "feature" in the OMAP3 EHCI controller,
 190          * causes suspended ports to be taken out of suspend when
 191          * the USBCMD.Run/Stop bit is cleared (for example when
 192          * we do ehci_bus_suspend).
 193          * This breaks suspend-resume if the root-hub is allowed
 194          * to suspend. Writing 1 to this undocumented register bit
 195          * disables this feature and restores normal behavior.
 196          */
 197         ehci_write(regs, EHCI_INSNREG04,
 198                                 EHCI_INSNREG04_DISABLE_UNSUSPEND);
 199
 200         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 201         if (ret) {
 202                 dev_err(dev, "failed to add hcd with err %d\n", ret);
 203                 goto err_pm_runtime;
 204         }
 205         device_wakeup_enable(hcd->self.controller);
 206
 207         /*
 208          * Bring PHYs out of reset for non PHY modes.
 209          * Even though HSIC mode is a PHY-less mode, the reset
 210          * line exists between the chips and can be modelled
 211          * as a PHY device for reset control.
 212          */
 213         for (i = 0; i < omap->nports; i++) {
 214                 if (!omap->phy[i] ||
 215                      pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY)
 216                         continue;
 217
 218                 usb_phy_init(omap->phy[i]);
 219                 /* bring PHY out of suspend */
 220                 usb_phy_set_suspend(omap->phy[i], 0);
 221         }
 222
 223         return 0;
 224
 225 err_pm_runtime:
 226         pm_runtime_put_sync(dev);
 227
 228 err_phy:
 229         for (i = 0; i < omap->nports; i++) {
 230                 if (omap->phy[i])
 231                         usb_phy_shutdown(omap->phy[i]);
 232         }
 233
 234         usb_put_hcd(hcd);
 235
 236         return ret;
 237 }
 238
 239
 240 /**
 241  * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
 242  * @pdev: USB Host Controller being removed
 243  *
 244  * Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
 245  * the HCD's stop() method.  It is always called from a thread
 246  * context, normally "rmmod", "apmd", or something similar.
 247  */
 248 static int ehci_hcd_omap_remove(struct platform_device *pdev)
 249 {
 250         struct device *dev = &pdev->dev;
 251         struct usb_hcd *hcd = dev_get_drvdata(dev);
 252         struct omap_hcd *omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
 253         int i;
 254
 255         usb_remove_hcd(hcd);
 256
 257         for (i = 0; i < omap->nports; i++) {
 258                 if (omap->phy[i])
 259                         usb_phy_shutdown(omap->phy[i]);
 260         }
 261
 262         usb_put_hcd(hcd);
 263         pm_runtime_put_sync(dev);
 264         pm_runtime_disable(dev);
 265
 266         return 0;
 267 }
 268
 269 static const struct of_device_id omap_ehci_dt_ids[] = {
 270         { .compatible = "ti,ehci-omap" },
 271         { }
 272 };
 273
 274 MODULE_DEVICE_TABLE(of, omap_ehci_dt_ids);
 275
 276 static struct platform_driver ehci_hcd_omap_driver = {
 277         .probe                  = ehci_hcd_omap_probe,
 278         .remove                 = ehci_hcd_omap_remove,
 279         .shutdown               = usb_hcd_platform_shutdown,
 280         /*.suspend              = ehci_hcd_omap_suspend, */
 281         /*.resume               = ehci_hcd_omap_resume, */
 282         .driver = {
 283                 .name           = hcd_name,
 284                 .of_match_table = omap_ehci_dt_ids,
 285         }
 286 };
 287
 288 /*-------------------------------------------------------------------------*/
 289
 290 static int __init ehci_omap_init(void)
 291 {
 292         if (usb_disabled())
 293                 return -ENODEV;
 294
 295         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 296
 297         ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides);
 298         return platform_driver_register(&ehci_hcd_omap_driver);
 299 }
 300 module_init(ehci_omap_init);
 301
 302 static void __exit ehci_omap_cleanup(void)
 303 {
 304         platform_driver_unregister(&ehci_hcd_omap_driver);
 305 }
 306 module_exit(ehci_omap_cleanup);
 307
 308 MODULE_ALIAS("platform:ehci-omap");
 309 MODULE_AUTHOR("Texas Instruments, Inc.");
 310 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
 311 MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
 312
 313 MODULE_DESCRIPTION(DRIVER_DESC);
 314 MODULE_LICENSE("GPL");