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/pxa2xx-regs.h> /* FIXME: for PSSR */
  31 #include <asm/arch/ohci.h>
  32
  33 #define PXA_UHC_MAX_PORTNUM    3
  34
  35 #define UHCRHPS(x)              __REG2( 0x4C000050, (x)<<2 )
  36
  37 static struct clk *usb_clk;
  38
  39 /*
  40   PMM_NPS_MODE -- PMM Non-power switching mode
  41       Ports are powered continuously.
  42
  43   PMM_GLOBAL_MODE -- PMM global switching mode
  44       All ports are powered at the same time.
  45
  46   PMM_PERPORT_MODE -- PMM per port switching mode
  47       Ports are powered individually.
  48  */
  49 static int pxa27x_ohci_select_pmm( int mode )
  50 {
  51         switch ( mode ) {
  52         case PMM_NPS_MODE:
  53                 UHCRHDA |= RH_A_NPS;
  54                 break;
  55         case PMM_GLOBAL_MODE:
  56                 UHCRHDA &= ~(RH_A_NPS & RH_A_PSM);
  57                 break;
  58         case PMM_PERPORT_MODE:
  59                 UHCRHDA &= ~(RH_A_NPS);
  60                 UHCRHDA |= RH_A_PSM;
  61
  62                 /* Set port power control mask bits, only 3 ports. */
  63                 UHCRHDB |= (0x7<<17);
  64                 break;
  65         default:
  66                 printk( KERN_ERR
  67                         "Invalid mode %d, set to non-power switch mode.\n",
  68                         mode );
  69
  70                 UHCRHDA |= RH_A_NPS;
  71         }
  72
  73         return 0;
  74 }
  75
  76 extern int usb_disabled(void);
  77
  78 /*-------------------------------------------------------------------------*/
  79
  80 static int pxa27x_start_hc(struct device *dev)
  81 {
  82         int retval = 0;
  83         struct pxaohci_platform_data *inf;
  84
  85         inf = dev->platform_data;
  86
  87         clk_enable(usb_clk);
  88
  89         UHCHR |= UHCHR_FHR;
  90         udelay(11);
  91         UHCHR &= ~UHCHR_FHR;
  92
  93         UHCHR |= UHCHR_FSBIR;
  94         while (UHCHR & UHCHR_FSBIR)
  95                 cpu_relax();
  96
  97         if (inf->init)
  98                 retval = inf->init(dev);
  99
 100         if (retval < 0)
 101                 return retval;
 102
 103         UHCHR &= ~UHCHR_SSE;
 104
 105         UHCHIE = (UHCHIE_UPRIE | UHCHIE_RWIE);
 106
 107         /* Clear any OTG Pin Hold */
 108         if (cpu_is_pxa27x() && (PSSR & PSSR_OTGPH))
 109                 PSSR |= PSSR_OTGPH;
 110
 111         return 0;
 112 }
 113
 114 static void pxa27x_stop_hc(struct device *dev)
 115 {
 116         struct pxaohci_platform_data *inf;
 117
 118         inf = dev->platform_data;
 119
 120         if (inf->exit)
 121                 inf->exit(dev);
 122
 123         UHCHR |= UHCHR_FHR;
 124         udelay(11);
 125         UHCHR &= ~UHCHR_FHR;
 126
 127         UHCCOMS |= 1;
 128         udelay(10);
 129
 130         clk_disable(usb_clk);
 131 }
 132
 133
 134 /*-------------------------------------------------------------------------*/
 135
 136 /* configure so an HC device and id are always provided */
 137 /* always called with process context; sleeping is OK */
 138
 139
 140 /**
 141  * usb_hcd_pxa27x_probe - initialize pxa27x-based HCDs
 142  * Context: !in_interrupt()
 143  *
 144  * Allocates basic resources for this USB host controller, and
 145  * then invokes the start() method for the HCD associated with it
 146  * through the hotplug entry's driver_data.
 147  *
 148  */
 149 int usb_hcd_pxa27x_probe (const struct hc_driver *driver, struct platform_device *pdev)
 150 {
 151         int retval;
 152         struct usb_hcd *hcd;
 153         struct pxaohci_platform_data *inf;
 154
 155         inf = pdev->dev.platform_data;
 156
 157         if (!inf)
 158                 return -ENODEV;
 159
 160         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
 161                 pr_debug ("resource[1] is not IORESOURCE_IRQ");
 162                 return -ENOMEM;
 163         }
 164
 165         usb_clk = clk_get(&pdev->dev, "USBCLK");
 166         if (IS_ERR(usb_clk))
 167                 return PTR_ERR(usb_clk);
 168
 169         hcd = usb_create_hcd (driver, &pdev->dev, "pxa27x");
 170         if (!hcd)
 171                 return -ENOMEM;
 172         hcd->rsrc_start = pdev->resource[0].start;
 173         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 174
 175         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 176                 pr_debug("request_mem_region failed");
 177                 retval = -EBUSY;
 178                 goto err1;
 179         }
 180
 181         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 182         if (!hcd->regs) {
 183                 pr_debug("ioremap failed");
 184                 retval = -ENOMEM;
 185                 goto err2;
 186         }
 187
 188         if ((retval = pxa27x_start_hc(&pdev->dev)) < 0) {
 189                 pr_debug("pxa27x_start_hc failed");
 190                 goto err3;
 191         }
 192
 193         /* Select Power Management Mode */
 194         pxa27x_ohci_select_pmm(inf->port_mode);
 195
 196         if (inf->power_budget)
 197                 hcd->power_budget = inf->power_budget;
 198
 199         ohci_hcd_init(hcd_to_ohci(hcd));
 200
 201         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
 202         if (retval == 0)
 203                 return retval;
 204
 205         pxa27x_stop_hc(&pdev->dev);
 206  err3:
 207         iounmap(hcd->regs);
 208  err2:
 209         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 210  err1:
 211         usb_put_hcd(hcd);
 212         clk_put(usb_clk);
 213         return retval;
 214 }
 215
 216
 217 /* may be called without controller electrically present */
 218 /* may be called with controller, bus, and devices active */
 219
 220 /**
 221  * usb_hcd_pxa27x_remove - shutdown processing for pxa27x-based HCDs
 222  * @dev: USB Host Controller being removed
 223  * Context: !in_interrupt()
 224  *
 225  * Reverses the effect of usb_hcd_pxa27x_probe(), first invoking
 226  * the HCD's stop() method.  It is always called from a thread
 227  * context, normally "rmmod", "apmd", or something similar.
 228  *
 229  */
 230 void usb_hcd_pxa27x_remove (struct usb_hcd *hcd, struct platform_device *pdev)
 231 {
 232         usb_remove_hcd(hcd);
 233         pxa27x_stop_hc(&pdev->dev);
 234         iounmap(hcd->regs);
 235         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 236         usb_put_hcd(hcd);
 237         clk_put(usb_clk);
 238 }
 239
 240 /*-------------------------------------------------------------------------*/
 241
 242 static int __devinit
 243 ohci_pxa27x_start (struct usb_hcd *hcd)
 244 {
 245         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 246         int             ret;
 247
 248         ohci_dbg (ohci, "ohci_pxa27x_start, ohci:%p", ohci);
 249
 250         /* The value of NDP in roothub_a is incorrect on this hardware */
 251         ohci->num_ports = 3;
 252
 253         if ((ret = ohci_init(ohci)) < 0)
 254                 return ret;
 255
 256         if ((ret = ohci_run (ohci)) < 0) {
 257                 err ("can't start %s", hcd->self.bus_name);
 258                 ohci_stop (hcd);
 259                 return ret;
 260         }
 261
 262         return 0;
 263 }
 264
 265 /*-------------------------------------------------------------------------*/
 266
 267 static const struct hc_driver ohci_pxa27x_hc_driver = {
 268         .description =          hcd_name,
 269         .product_desc =         "PXA27x OHCI",
 270         .hcd_priv_size =        sizeof(struct ohci_hcd),
 271
 272         /*
 273          * generic hardware linkage
 274          */
 275         .irq =                  ohci_irq,
 276         .flags =                HCD_USB11 | HCD_MEMORY,
 277
 278         /*
 279          * basic lifecycle operations
 280          */
 281         .start =                ohci_pxa27x_start,
 282         .stop =                 ohci_stop,
 283         .shutdown =             ohci_shutdown,
 284
 285         /*
 286          * managing i/o requests and associated device resources
 287          */
 288         .urb_enqueue =          ohci_urb_enqueue,
 289         .urb_dequeue =          ohci_urb_dequeue,
 290         .endpoint_disable =     ohci_endpoint_disable,
 291
 292         /*
 293          * scheduling support
 294          */
 295         .get_frame_number =     ohci_get_frame,
 296
 297         /*
 298          * root hub support
 299          */
 300         .hub_status_data =      ohci_hub_status_data,
 301         .hub_control =          ohci_hub_control,
 302         .hub_irq_enable =       ohci_rhsc_enable,
 303 #ifdef  CONFIG_PM
 304         .bus_suspend =          ohci_bus_suspend,
 305         .bus_resume =           ohci_bus_resume,
 306 #endif
 307         .start_port_reset =     ohci_start_port_reset,
 308 };
 309
 310 /*-------------------------------------------------------------------------*/
 311
 312 static int ohci_hcd_pxa27x_drv_probe(struct platform_device *pdev)
 313 {
 314         pr_debug ("In ohci_hcd_pxa27x_drv_probe");
 315
 316         if (usb_disabled())
 317                 return -ENODEV;
 318
 319         return usb_hcd_pxa27x_probe(&ohci_pxa27x_hc_driver, pdev);
 320 }
 321
 322 static int ohci_hcd_pxa27x_drv_remove(struct platform_device *pdev)
 323 {
 324         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 325
 326         usb_hcd_pxa27x_remove(hcd, pdev);
 327         platform_set_drvdata(pdev, NULL);
 328         return 0;
 329 }
 330
 331 #ifdef  CONFIG_PM
 332 static int ohci_hcd_pxa27x_drv_suspend(struct platform_device *pdev, pm_message_t state)
 333 {
 334         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 335         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 336
 337         if (time_before(jiffies, ohci->next_statechange))
 338                 msleep(5);
 339         ohci->next_statechange = jiffies;
 340
 341         pxa27x_stop_hc(&pdev->dev);
 342         hcd->state = HC_STATE_SUSPENDED;
 343
 344         return 0;
 345 }
 346
 347 static int ohci_hcd_pxa27x_drv_resume(struct platform_device *pdev)
 348 {
 349         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 350         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 351         int status;
 352
 353         if (time_before(jiffies, ohci->next_statechange))
 354                 msleep(5);
 355         ohci->next_statechange = jiffies;
 356
 357         if ((status = pxa27x_start_hc(&pdev->dev)) < 0)
 358                 return status;
 359
 360         ohci_finish_controller_resume(hcd);
 361         return 0;
 362 }
 363 #endif
 364
 365 /* work with hotplug and coldplug */
 366 MODULE_ALIAS("platform:pxa27x-ohci");
 367
 368 static struct platform_driver ohci_hcd_pxa27x_driver = {
 369         .probe          = ohci_hcd_pxa27x_drv_probe,
 370         .remove         = ohci_hcd_pxa27x_drv_remove,
 371         .shutdown       = usb_hcd_platform_shutdown,
 372 #ifdef CONFIG_PM
 373         .suspend        = ohci_hcd_pxa27x_drv_suspend,
 374         .resume         = ohci_hcd_pxa27x_drv_resume,
 375 #endif
 376         .driver         = {
 377                 .name   = "pxa27x-ohci",
 378                 .owner  = THIS_MODULE,
 379         },
 380 };
 381