drivers/usb/host/ohci-pxa27x.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   6  * (C) Copyright 2002 Hewlett-Packard Company
   7  *
   8  * Bus Glue for pxa27x
   9  *
  10  * Written by Christopher Hoover <ch@hpl.hp.com>
  11  * Based on fragments of previous driver by Russell King et al.
  12  *
  13  * Modified for LH7A404 from ohci-sa1111.c
  14  *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
  15  *
  16  * Modified for pxa27x from ohci-lh7a404.c
  17  *  by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
  18  *
  19  * This file is licenced under the GPL.
  20  */
  21
  22 #include <linux/device.h>
  23 #include <linux/signal.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/clk.h>
  26
  27 #include <asm/mach-types.h>
  28 #include <asm/hardware.h>
  29 #include <asm/arch/pxa-regs.h>
  30 #include <asm/arch/ohci.h>
  31
  32 #define PXA_UHC_MAX_PORTNUM    3
  33
  34 #define UHCRHPS(x)              __REG2( 0x4C000050, (x)<<2 )
  35
  36 static struct clk *usb_clk;
  37
  38 /*
  39   PMM_NPS_MODE -- PMM Non-power switching mode
  40       Ports are powered continuously.
  41
  42   PMM_GLOBAL_MODE -- PMM global switching mode
  43       All ports are powered at the same time.
  44
  45   PMM_PERPORT_MODE -- PMM per port switching mode
  46       Ports are powered individually.
  47  */
  48 static int pxa27x_ohci_select_pmm( int mode )
  49 {
  50         switch ( mode ) {
  51         case PMM_NPS_MODE:
  52                 UHCRHDA |= RH_A_NPS;
  53                 break;
  54         case PMM_GLOBAL_MODE:
  55                 UHCRHDA &= ~(RH_A_NPS & RH_A_PSM);
  56                 break;
  57         case PMM_PERPORT_MODE:
  58                 UHCRHDA &= ~(RH_A_NPS);
  59                 UHCRHDA |= RH_A_PSM;
  60
  61                 /* Set port power control mask bits, only 3 ports. */
  62                 UHCRHDB |= (0x7<<17);
  63                 break;
  64         default:
  65                 printk( KERN_ERR
  66                         "Invalid mode %d, set to non-power switch mode.\n",
  67                         mode );
  68
  69                 UHCRHDA |= RH_A_NPS;
  70         }
  71
  72         return 0;
  73 }
  74
  75 extern int usb_disabled(void);
  76
  77 /*-------------------------------------------------------------------------*/
  78
  79 static int pxa27x_start_hc(struct device *dev)
  80 {
  81         int retval = 0;
  82         struct pxaohci_platform_data *inf;
  83
  84         inf = dev->platform_data;
  85
  86         clk_enable(usb_clk);
  87
  88         UHCHR |= UHCHR_FHR;
  89         udelay(11);
  90         UHCHR &= ~UHCHR_FHR;
  91
  92         UHCHR |= UHCHR_FSBIR;
  93         while (UHCHR & UHCHR_FSBIR)
  94                 cpu_relax();
  95
  96         if (inf->init)
  97                 retval = inf->init(dev);
  98
  99         if (retval < 0)
 100                 return retval;
 101
 102         UHCHR &= ~UHCHR_SSE;
 103
 104         UHCHIE = (UHCHIE_UPRIE | UHCHIE_RWIE);
 105
 106         /* Clear any OTG Pin Hold */
 107         if (PSSR & PSSR_OTGPH)
 108                 PSSR |= PSSR_OTGPH;
 109
 110         return 0;
 111 }
 112
 113 static void pxa27x_stop_hc(struct device *dev)
 114 {
 115         struct pxaohci_platform_data *inf;
 116
 117         inf = dev->platform_data;
 118
 119         if (inf->exit)
 120                 inf->exit(dev);
 121
 122         UHCHR |= UHCHR_FHR;
 123         udelay(11);
 124         UHCHR &= ~UHCHR_FHR;
 125
 126         UHCCOMS |= 1;
 127         udelay(10);
 128
 129         clk_disable(usb_clk);
 130 }
 131
 132
 133 /*-------------------------------------------------------------------------*/
 134
 135 /* configure so an HC device and id are always provided */
 136 /* always called with process context; sleeping is OK */
 137
 138
 139 /**
 140  * usb_hcd_pxa27x_probe - initialize pxa27x-based HCDs
 141  * Context: !in_interrupt()
 142  *
 143  * Allocates basic resources for this USB host controller, and
 144  * then invokes the start() method for the HCD associated with it
 145  * through the hotplug entry's driver_data.
 146  *
 147  */
 148 int usb_hcd_pxa27x_probe (const struct hc_driver *driver, struct platform_device *pdev)
 149 {
 150         int retval;
 151         struct usb_hcd *hcd;
 152         struct pxaohci_platform_data *inf;
 153
 154         inf = pdev->dev.platform_data;
 155
 156         if (!inf)
 157                 return -ENODEV;
 158
 159         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
 160                 pr_debug ("resource[1] is not IORESOURCE_IRQ");
 161                 return -ENOMEM;
 162         }
 163
 164         usb_clk = clk_get(&pdev->dev, "USBCLK");
 165         if (IS_ERR(usb_clk))
 166                 return PTR_ERR(usb_clk);
 167
 168         hcd = usb_create_hcd (driver, &pdev->dev, "pxa27x");
 169         if (!hcd)
 170                 return -ENOMEM;
 171         hcd->rsrc_start = pdev->resource[0].start;
 172         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 173
 174         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 175                 pr_debug("request_mem_region failed");
 176                 retval = -EBUSY;
 177                 goto err1;
 178         }
 179
 180         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 181         if (!hcd->regs) {
 182                 pr_debug("ioremap failed");
 183                 retval = -ENOMEM;
 184                 goto err2;
 185         }
 186
 187         if ((retval = pxa27x_start_hc(&pdev->dev)) < 0) {
 188                 pr_debug("pxa27x_start_hc failed");
 189                 goto err3;
 190         }
 191
 192         /* Select Power Management Mode */
 193         pxa27x_ohci_select_pmm(inf->port_mode);
 194
 195         if (inf->power_budget)
 196                 hcd->power_budget = inf->power_budget;
 197
 198         ohci_hcd_init(hcd_to_ohci(hcd));
 199
 200         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
 201         if (retval == 0)
 202                 return retval;
 203
 204         pxa27x_stop_hc(&pdev->dev);
 205  err3:
 206         iounmap(hcd->regs);
 207  err2:
 208         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 209  err1:
 210         usb_put_hcd(hcd);
 211         clk_put(usb_clk);
 212         return retval;
 213 }
 214
 215
 216 /* may be called without controller electrically present */
 217 /* may be called with controller, bus, and devices active */
 218
 219 /**
 220  * usb_hcd_pxa27x_remove - shutdown processing for pxa27x-based HCDs
 221  * @dev: USB Host Controller being removed
 222  * Context: !in_interrupt()
 223  *
 224  * Reverses the effect of usb_hcd_pxa27x_probe(), first invoking
 225  * the HCD's stop() method.  It is always called from a thread
 226  * context, normally "rmmod", "apmd", or something similar.
 227  *
 228  */
 229 void usb_hcd_pxa27x_remove (struct usb_hcd *hcd, struct platform_device *pdev)
 230 {
 231         usb_remove_hcd(hcd);
 232         pxa27x_stop_hc(&pdev->dev);
 233         iounmap(hcd->regs);
 234         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 235         usb_put_hcd(hcd);
 236         clk_put(usb_clk);
 237 }
 238
 239 /*-------------------------------------------------------------------------*/
 240
 241 static int __devinit
 242 ohci_pxa27x_start (struct usb_hcd *hcd)
 243 {
 244         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 245         int             ret;
 246
 247         ohci_dbg (ohci, "ohci_pxa27x_start, ohci:%p", ohci);
 248
 249         /* The value of NDP in roothub_a is incorrect on this hardware */
 250         ohci->num_ports = 3;
 251
 252         if ((ret = ohci_init(ohci)) < 0)
 253                 return ret;
 254
 255         if ((ret = ohci_run (ohci)) < 0) {
 256                 err ("can't start %s", hcd->self.bus_name);
 257                 ohci_stop (hcd);
 258                 return ret;
 259         }
 260
 261         return 0;
 262 }
 263
 264 /*-------------------------------------------------------------------------*/
 265
 266 static const struct hc_driver ohci_pxa27x_hc_driver = {
 267         .description =          hcd_name,
 268         .product_desc =         "PXA27x OHCI",
 269         .hcd_priv_size =        sizeof(struct ohci_hcd),
 270
 271         /*
 272          * generic hardware linkage
 273          */
 274         .irq =                  ohci_irq,
 275         .flags =                HCD_USB11 | HCD_MEMORY,
 276
 277         /*
 278          * basic lifecycle operations
 279          */
 280         .start =                ohci_pxa27x_start,
 281         .stop =                 ohci_stop,
 282         .shutdown =             ohci_shutdown,
 283
 284         /*
 285          * managing i/o requests and associated device resources
 286          */
 287         .urb_enqueue =          ohci_urb_enqueue,
 288         .urb_dequeue =          ohci_urb_dequeue,
 289         .endpoint_disable =     ohci_endpoint_disable,
 290
 291         /*
 292          * scheduling support
 293          */
 294         .get_frame_number =     ohci_get_frame,
 295
 296         /*
 297          * root hub support
 298          */
 299         .hub_status_data =      ohci_hub_status_data,
 300         .hub_control =          ohci_hub_control,
 301 #ifdef  CONFIG_PM
 302         .bus_suspend =          ohci_bus_suspend,
 303         .bus_resume =           ohci_bus_resume,
 304 #endif
 305         .start_port_reset =     ohci_start_port_reset,
 306 };
 307
 308 /*-------------------------------------------------------------------------*/
 309
 310 static int ohci_hcd_pxa27x_drv_probe(struct platform_device *pdev)
 311 {
 312         pr_debug ("In ohci_hcd_pxa27x_drv_probe");
 313
 314         if (usb_disabled())
 315                 return -ENODEV;
 316
 317         return usb_hcd_pxa27x_probe(&ohci_pxa27x_hc_driver, pdev);
 318 }
 319
 320 static int ohci_hcd_pxa27x_drv_remove(struct platform_device *pdev)
 321 {
 322         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 323
 324         usb_hcd_pxa27x_remove(hcd, pdev);
 325         platform_set_drvdata(pdev, NULL);
 326         return 0;
 327 }
 328
 329 #ifdef  CONFIG_PM
 330 static int ohci_hcd_pxa27x_drv_suspend(struct platform_device *pdev, pm_message_t state)
 331 {
 332         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 333         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 334
 335         if (time_before(jiffies, ohci->next_statechange))
 336                 msleep(5);
 337         ohci->next_statechange = jiffies;
 338
 339         pxa27x_stop_hc(&pdev->dev);
 340         hcd->state = HC_STATE_SUSPENDED;
 341
 342         return 0;
 343 }
 344
 345 static int ohci_hcd_pxa27x_drv_resume(struct platform_device *pdev)
 346 {
 347         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 348         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 349         int status;
 350
 351         if (time_before(jiffies, ohci->next_statechange))
 352                 msleep(5);
 353         ohci->next_statechange = jiffies;
 354
 355         if ((status = pxa27x_start_hc(&pdev->dev)) < 0)
 356                 return status;
 357
 358         ohci_finish_controller_resume(hcd);
 359         return 0;
 360 }
 361 #endif
 362
 363 /* work with hotplug and coldplug */
 364 MODULE_ALIAS("platform:pxa27x-ohci");
 365
 366 static struct platform_driver ohci_hcd_pxa27x_driver = {
 367         .probe          = ohci_hcd_pxa27x_drv_probe,
 368         .remove         = ohci_hcd_pxa27x_drv_remove,
 369         .shutdown       = usb_hcd_platform_shutdown,
 370 #ifdef CONFIG_PM
 371         .suspend        = ohci_hcd_pxa27x_drv_suspend,
 372         .resume         = ohci_hcd_pxa27x_drv_resume,
 373 #endif
 374         .driver         = {
 375                 .name   = "pxa27x-ohci",
 376                 .owner  = THIS_MODULE,
 377         },
 378 };
 379