drivers/usb/host/ehci-omap.c

   1 /*
   2  * ehci-omap.c - driver for USBHOST on OMAP3/4 processors
   3  *
   4  * Bus Glue for the EHCI controllers in OMAP3/4
   5  * Tested on several OMAP3 boards, and OMAP4 Pandaboard
   6  *
   7  * Copyright (C) 2007-2011 Texas Instruments, Inc.
   8  *      Author: Vikram Pandita <vikram.pandita@ti.com>
   9  *      Author: Anand Gadiyar <gadiyar@ti.com>
  10  *      Author: Keshava Munegowda <keshava_mgowda@ti.com>
  11  *
  12  * Copyright (C) 2009 Nokia Corporation
  13  *      Contact: Felipe Balbi <felipe.balbi@nokia.com>
  14  *
  15  * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2 of the License, or
  20  * (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  30  *
  31  * TODO (last updated Feb 27, 2010):
  32  *      - add kernel-doc
  33  *      - enable AUTOIDLE
  34  *      - add suspend/resume
  35  *      - add HSIC and TLL support
  36  *      - convert to use hwmod and runtime PM
  37  */
  38
  39 #include <linux/platform_device.h>
  40 #include <linux/slab.h>
  41 #include <linux/usb/ulpi.h>
  42 #include <plat/usb.h>
  43 #include <linux/regulator/consumer.h>
  44
  45 /* EHCI Register Set */
  46 #define EHCI_INSNREG04                                  (0xA0)
  47 #define EHCI_INSNREG04_DISABLE_UNSUSPEND                (1 << 5)
  48 #define EHCI_INSNREG05_ULPI                             (0xA4)
  49 #define EHCI_INSNREG05_ULPI_CONTROL_SHIFT               31
  50 #define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT               24
  51 #define EHCI_INSNREG05_ULPI_OPSEL_SHIFT                 22
  52 #define EHCI_INSNREG05_ULPI_REGADD_SHIFT                16
  53 #define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT             8
  54 #define EHCI_INSNREG05_ULPI_WRDATA_SHIFT                0
  55
  56 /*-------------------------------------------------------------------------*/
  57
  58 static const struct hc_driver ehci_omap_hc_driver;
  59
  60
  61 static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
  62 {
  63         __raw_writel(val, base + reg);
  64 }
  65
  66 static inline u32 ehci_read(void __iomem *base, u32 reg)
  67 {
  68         return __raw_readl(base + reg);
  69 }
  70
  71 static void omap_ehci_soft_phy_reset(struct platform_device *pdev, u8 port)
  72 {
  73         struct usb_hcd  *hcd = dev_get_drvdata(&pdev->dev);
  74         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
  75         unsigned reg = 0;
  76
  77         reg = ULPI_FUNC_CTRL_RESET
  78                 /* FUNCTION_CTRL_SET register */
  79                 | (ULPI_SET(ULPI_FUNC_CTRL) << EHCI_INSNREG05_ULPI_REGADD_SHIFT)
  80                 /* Write */
  81                 | (2 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT)
  82                 /* PORTn */
  83                 | ((port + 1) << EHCI_INSNREG05_ULPI_PORTSEL_SHIFT)
  84                 /* start ULPI access*/
  85                 | (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT);
  86
  87         ehci_write(hcd->regs, EHCI_INSNREG05_ULPI, reg);
  88
  89         /* Wait for ULPI access completion */
  90         while ((ehci_read(hcd->regs, EHCI_INSNREG05_ULPI)
  91                         & (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT))) {
  92                 cpu_relax();
  93
  94                 if (time_after(jiffies, timeout)) {
  95                         dev_dbg(&pdev->dev, "phy reset operation timed out\n");
  96                         break;
  97                 }
  98         }
  99 }
 100
 101 static void disable_put_regulator(
 102                 struct ehci_hcd_omap_platform_data *pdata)
 103 {
 104         int i;
 105
 106         for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
 107                 if (pdata->regulator[i]) {
 108                         regulator_disable(pdata->regulator[i]);
 109                         regulator_put(pdata->regulator[i]);
 110                 }
 111         }
 112 }
 113
 114 /* configure so an HC device and id are always provided */
 115 /* always called with process context; sleeping is OK */
 116
 117 /**
 118  * ehci_hcd_omap_probe - initialize TI-based HCDs
 119  *
 120  * Allocates basic resources for this USB host controller, and
 121  * then invokes the start() method for the HCD associated with it
 122  * through the hotplug entry's driver_data.
 123  */
 124 static int ehci_hcd_omap_probe(struct platform_device *pdev)
 125 {
 126         struct device                           *dev = &pdev->dev;
 127         struct ehci_hcd_omap_platform_data      *pdata = dev->platform_data;
 128         struct resource                         *res;
 129         struct usb_hcd                          *hcd;
 130         void __iomem                            *regs;
 131         struct ehci_hcd                         *omap_ehci;
 132         int                                     ret = -ENODEV;
 133         int                                     irq;
 134         int                                     i;
 135         char                                    supply[7];
 136
 137         if (usb_disabled())
 138                 return -ENODEV;
 139
 140         if (!dev->parent) {
 141                 dev_err(dev, "Missing parent device\n");
 142                 return -ENODEV;
 143         }
 144
 145         irq = platform_get_irq_byname(pdev, "ehci-irq");
 146         if (irq < 0) {
 147                 dev_err(dev, "EHCI irq failed\n");
 148                 return -ENODEV;
 149         }
 150
 151         res =  platform_get_resource_byname(pdev,
 152                                 IORESOURCE_MEM, "ehci");
 153         if (!res) {
 154                 dev_err(dev, "UHH EHCI get resource failed\n");
 155                 return -ENODEV;
 156         }
 157
 158         regs = ioremap(res->start, resource_size(res));
 159         if (!regs) {
 160                 dev_err(dev, "UHH EHCI ioremap failed\n");
 161                 return -ENOMEM;
 162         }
 163
 164         hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
 165                         dev_name(dev));
 166         if (!hcd) {
 167                 dev_err(dev, "failed to create hcd with err %d\n", ret);
 168                 ret = -ENOMEM;
 169                 goto err_io;
 170         }
 171
 172         hcd->rsrc_start = res->start;
 173         hcd->rsrc_len = resource_size(res);
 174         hcd->regs = regs;
 175
 176         /* get ehci regulator and enable */
 177         for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
 178                 if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY) {
 179                         pdata->regulator[i] = NULL;
 180                         continue;
 181                 }
 182                 snprintf(supply, sizeof(supply), "hsusb%d", i);
 183                 pdata->regulator[i] = regulator_get(dev, supply);
 184                 if (IS_ERR(pdata->regulator[i])) {
 185                         pdata->regulator[i] = NULL;
 186                         dev_dbg(dev,
 187                         "failed to get ehci port%d regulator\n", i);
 188                 } else {
 189                         regulator_enable(pdata->regulator[i]);
 190                 }
 191         }
 192
 193         ret = omap_usbhs_enable(dev);
 194         if (ret) {
 195                 dev_err(dev, "failed to start usbhs with err %d\n", ret);
 196                 goto err_enable;
 197         }
 198
 199         /*
 200          * An undocumented "feature" in the OMAP3 EHCI controller,
 201          * causes suspended ports to be taken out of suspend when
 202          * the USBCMD.Run/Stop bit is cleared (for example when
 203          * we do ehci_bus_suspend).
 204          * This breaks suspend-resume if the root-hub is allowed
 205          * to suspend. Writing 1 to this undocumented register bit
 206          * disables this feature and restores normal behavior.
 207          */
 208         ehci_write(regs, EHCI_INSNREG04,
 209                                 EHCI_INSNREG04_DISABLE_UNSUSPEND);
 210
 211         /* Soft reset the PHY using PHY reset command over ULPI */
 212         if (pdata->port_mode[0] == OMAP_EHCI_PORT_MODE_PHY)
 213                 omap_ehci_soft_phy_reset(pdev, 0);
 214         if (pdata->port_mode[1] == OMAP_EHCI_PORT_MODE_PHY)
 215                 omap_ehci_soft_phy_reset(pdev, 1);
 216
 217         omap_ehci = hcd_to_ehci(hcd);
 218         omap_ehci->sbrn = 0x20;
 219
 220         /* we know this is the memory we want, no need to ioremap again */
 221         omap_ehci->caps = hcd->regs;
 222         omap_ehci->regs = hcd->regs
 223                 + HC_LENGTH(ehci, readl(&omap_ehci->caps->hc_capbase));
 224
 225         dbg_hcs_params(omap_ehci, "reset");
 226         dbg_hcc_params(omap_ehci, "reset");
 227
 228         /* cache this readonly data; minimize chip reads */
 229         omap_ehci->hcs_params = readl(&omap_ehci->caps->hcs_params);
 230
 231         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 232         if (ret) {
 233                 dev_err(dev, "failed to add hcd with err %d\n", ret);
 234                 goto err_add_hcd;
 235         }
 236
 237         /* root ports should always stay powered */
 238         ehci_port_power(omap_ehci, 1);
 239
 240         return 0;
 241
 242 err_add_hcd:
 243         omap_usbhs_disable(dev);
 244
 245 err_enable:
 246         disable_put_regulator(pdata);
 247         usb_put_hcd(hcd);
 248
 249 err_io:
 250         iounmap(regs);
 251         return ret;
 252 }
 253
 254
 255 /**
 256  * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
 257  * @pdev: USB Host Controller being removed
 258  *
 259  * Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
 260  * the HCD's stop() method.  It is always called from a thread
 261  * context, normally "rmmod", "apmd", or something similar.
 262  */
 263 static int ehci_hcd_omap_remove(struct platform_device *pdev)
 264 {
 265         struct device *dev      = &pdev->dev;
 266         struct usb_hcd *hcd     = dev_get_drvdata(dev);
 267
 268         usb_remove_hcd(hcd);
 269         omap_usbhs_disable(dev);
 270         disable_put_regulator(dev->platform_data);
 271         iounmap(hcd->regs);
 272         usb_put_hcd(hcd);
 273         return 0;
 274 }
 275
 276 static void ehci_hcd_omap_shutdown(struct platform_device *pdev)
 277 {
 278         struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
 279
 280         if (hcd->driver->shutdown)
 281                 hcd->driver->shutdown(hcd);
 282 }
 283
 284 static struct platform_driver ehci_hcd_omap_driver = {
 285         .probe                  = ehci_hcd_omap_probe,
 286         .remove                 = ehci_hcd_omap_remove,
 287         .shutdown               = ehci_hcd_omap_shutdown,
 288         /*.suspend              = ehci_hcd_omap_suspend, */
 289         /*.resume               = ehci_hcd_omap_resume, */
 290         .driver = {
 291                 .name           = "ehci-omap",
 292         }
 293 };
 294
 295 /*-------------------------------------------------------------------------*/
 296
 297 static const struct hc_driver ehci_omap_hc_driver = {
 298         .description            = hcd_name,
 299         .product_desc           = "OMAP-EHCI Host Controller",
 300         .hcd_priv_size          = sizeof(struct ehci_hcd),
 301
 302         /*
 303          * generic hardware linkage
 304          */
 305         .irq                    = ehci_irq,
 306         .flags                  = HCD_MEMORY | HCD_USB2,
 307
 308         /*
 309          * basic lifecycle operations
 310          */
 311         .reset                  = ehci_init,
 312         .start                  = ehci_run,
 313         .stop                   = ehci_stop,
 314         .shutdown               = ehci_shutdown,
 315
 316         /*
 317          * managing i/o requests and associated device resources
 318          */
 319         .urb_enqueue            = ehci_urb_enqueue,
 320         .urb_dequeue            = ehci_urb_dequeue,
 321         .endpoint_disable       = ehci_endpoint_disable,
 322         .endpoint_reset         = ehci_endpoint_reset,
 323
 324         /*
 325          * scheduling support
 326          */
 327         .get_frame_number       = ehci_get_frame,
 328
 329         /*
 330          * root hub support
 331          */
 332         .hub_status_data        = ehci_hub_status_data,
 333         .hub_control            = ehci_hub_control,
 334         .bus_suspend            = ehci_bus_suspend,
 335         .bus_resume             = ehci_bus_resume,
 336
 337         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 338 };
 339
 340 MODULE_ALIAS("platform:omap-ehci");
 341 MODULE_AUTHOR("Texas Instruments, Inc.");
 342 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
 343