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   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 <mach/hardware.h>
  28 #include <mach/pxa-regs.h>
  29 #include <mach/pxa2xx-regs.h> /* FIXME: for PSSR */
  30 #include <mach/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 inline void pxa27x_setup_hc(struct pxaohci_platform_data *inf)
  80 {
  81         uint32_t uhchr = UHCHR;
  82         uint32_t uhcrhda = UHCRHDA;
  83
  84         if (inf->flags & ENABLE_PORT1)
  85                 uhchr &= ~UHCHR_SSEP1;
  86
  87         if (inf->flags & ENABLE_PORT2)
  88                 uhchr &= ~UHCHR_SSEP2;
  89
  90         if (inf->flags & ENABLE_PORT3)
  91                 uhchr &= ~UHCHR_SSEP3;
  92
  93         if (inf->flags & POWER_CONTROL_LOW)
  94                 uhchr |= UHCHR_PCPL;
  95
  96         if (inf->flags & POWER_SENSE_LOW)
  97                 uhchr |= UHCHR_PSPL;
  98
  99         if (inf->flags & NO_OC_PROTECTION)
 100                 uhcrhda |= UHCRHDA_NOCP;
 101
 102         if (inf->flags & OC_MODE_PERPORT)
 103                 uhcrhda |= UHCRHDA_OCPM;
 104
 105         if (inf->power_on_delay) {
 106                 uhcrhda &= ~UHCRHDA_POTPGT(0xff);
 107                 uhcrhda |= UHCRHDA_POTPGT(inf->power_on_delay / 2);
 108         }
 109
 110         UHCHR = uhchr;
 111         UHCRHDA = uhcrhda;
 112 }
 113
 114 static int pxa27x_start_hc(struct device *dev)
 115 {
 116         int retval = 0;
 117         struct pxaohci_platform_data *inf;
 118
 119         inf = dev->platform_data;
 120
 121         clk_enable(usb_clk);
 122
 123         UHCHR |= UHCHR_FHR;
 124         udelay(11);
 125         UHCHR &= ~UHCHR_FHR;
 126
 127         UHCHR |= UHCHR_FSBIR;
 128         while (UHCHR & UHCHR_FSBIR)
 129                 cpu_relax();
 130
 131         pxa27x_setup_hc(inf);
 132
 133         if (inf->init)
 134                 retval = inf->init(dev);
 135
 136         if (retval < 0)
 137                 return retval;
 138
 139         UHCHR &= ~UHCHR_SSE;
 140
 141         UHCHIE = (UHCHIE_UPRIE | UHCHIE_RWIE);
 142
 143         /* Clear any OTG Pin Hold */
 144         if (cpu_is_pxa27x() && (PSSR & PSSR_OTGPH))
 145                 PSSR |= PSSR_OTGPH;
 146
 147         return 0;
 148 }
 149
 150 static void pxa27x_stop_hc(struct device *dev)
 151 {
 152         struct pxaohci_platform_data *inf;
 153
 154         inf = dev->platform_data;
 155
 156         if (inf->exit)
 157                 inf->exit(dev);
 158
 159         UHCHR |= UHCHR_FHR;
 160         udelay(11);
 161         UHCHR &= ~UHCHR_FHR;
 162
 163         UHCCOMS |= 1;
 164         udelay(10);
 165
 166         clk_disable(usb_clk);
 167 }
 168
 169
 170 /*-------------------------------------------------------------------------*/
 171
 172 /* configure so an HC device and id are always provided */
 173 /* always called with process context; sleeping is OK */
 174
 175
 176 /**
 177  * usb_hcd_pxa27x_probe - initialize pxa27x-based HCDs
 178  * Context: !in_interrupt()
 179  *
 180  * Allocates basic resources for this USB host controller, and
 181  * then invokes the start() method for the HCD associated with it
 182  * through the hotplug entry's driver_data.
 183  *
 184  */
 185 int usb_hcd_pxa27x_probe (const struct hc_driver *driver, struct platform_device *pdev)
 186 {
 187         int retval;
 188         struct usb_hcd *hcd;
 189         struct pxaohci_platform_data *inf;
 190
 191         inf = pdev->dev.platform_data;
 192
 193         if (!inf)
 194                 return -ENODEV;
 195
 196         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
 197                 pr_debug ("resource[1] is not IORESOURCE_IRQ");
 198                 return -ENOMEM;
 199         }
 200
 201         usb_clk = clk_get(&pdev->dev, "USBCLK");
 202         if (IS_ERR(usb_clk))
 203                 return PTR_ERR(usb_clk);
 204
 205         hcd = usb_create_hcd (driver, &pdev->dev, "pxa27x");
 206         if (!hcd)
 207                 return -ENOMEM;
 208         hcd->rsrc_start = pdev->resource[0].start;
 209         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 210
 211         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 212                 pr_debug("request_mem_region failed");
 213                 retval = -EBUSY;
 214                 goto err1;
 215         }
 216
 217         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 218         if (!hcd->regs) {
 219                 pr_debug("ioremap failed");
 220                 retval = -ENOMEM;
 221                 goto err2;
 222         }
 223
 224         if ((retval = pxa27x_start_hc(&pdev->dev)) < 0) {
 225                 pr_debug("pxa27x_start_hc failed");
 226                 goto err3;
 227         }
 228
 229         /* Select Power Management Mode */
 230         pxa27x_ohci_select_pmm(inf->port_mode);
 231
 232         if (inf->power_budget)
 233                 hcd->power_budget = inf->power_budget;
 234
 235         ohci_hcd_init(hcd_to_ohci(hcd));
 236
 237         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
 238         if (retval == 0)
 239                 return retval;
 240
 241         pxa27x_stop_hc(&pdev->dev);
 242  err3:
 243         iounmap(hcd->regs);
 244  err2:
 245         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 246  err1:
 247         usb_put_hcd(hcd);
 248         clk_put(usb_clk);
 249         return retval;
 250 }
 251
 252
 253 /* may be called without controller electrically present */
 254 /* may be called with controller, bus, and devices active */
 255
 256 /**
 257  * usb_hcd_pxa27x_remove - shutdown processing for pxa27x-based HCDs
 258  * @dev: USB Host Controller being removed
 259  * Context: !in_interrupt()
 260  *
 261  * Reverses the effect of usb_hcd_pxa27x_probe(), first invoking
 262  * the HCD's stop() method.  It is always called from a thread
 263  * context, normally "rmmod", "apmd", or something similar.
 264  *
 265  */
 266 void usb_hcd_pxa27x_remove (struct usb_hcd *hcd, struct platform_device *pdev)
 267 {
 268         usb_remove_hcd(hcd);
 269         pxa27x_stop_hc(&pdev->dev);
 270         iounmap(hcd->regs);
 271         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 272         usb_put_hcd(hcd);
 273         clk_put(usb_clk);
 274 }
 275
 276 /*-------------------------------------------------------------------------*/
 277
 278 static int __devinit
 279 ohci_pxa27x_start (struct usb_hcd *hcd)
 280 {
 281         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 282         int             ret;
 283
 284         ohci_dbg (ohci, "ohci_pxa27x_start, ohci:%p", ohci);
 285
 286         /* The value of NDP in roothub_a is incorrect on this hardware */
 287         ohci->num_ports = 3;
 288
 289         if ((ret = ohci_init(ohci)) < 0)
 290                 return ret;
 291
 292         if ((ret = ohci_run (ohci)) < 0) {
 293                 err ("can't start %s", hcd->self.bus_name);
 294                 ohci_stop (hcd);
 295                 return ret;
 296         }
 297
 298         return 0;
 299 }
 300
 301 /*-------------------------------------------------------------------------*/
 302
 303 static const struct hc_driver ohci_pxa27x_hc_driver = {
 304         .description =          hcd_name,
 305         .product_desc =         "PXA27x OHCI",
 306         .hcd_priv_size =        sizeof(struct ohci_hcd),
 307
 308         /*
 309          * generic hardware linkage
 310          */
 311         .irq =                  ohci_irq,
 312         .flags =                HCD_USB11 | HCD_MEMORY,
 313
 314         /*
 315          * basic lifecycle operations
 316          */
 317         .start =                ohci_pxa27x_start,
 318         .stop =                 ohci_stop,
 319         .shutdown =             ohci_shutdown,
 320
 321         /*
 322          * managing i/o requests and associated device resources
 323          */
 324         .urb_enqueue =          ohci_urb_enqueue,
 325         .urb_dequeue =          ohci_urb_dequeue,
 326         .endpoint_disable =     ohci_endpoint_disable,
 327
 328         /*
 329          * scheduling support
 330          */
 331         .get_frame_number =     ohci_get_frame,
 332
 333         /*
 334          * root hub support
 335          */
 336         .hub_status_data =      ohci_hub_status_data,
 337         .hub_control =          ohci_hub_control,
 338 #ifdef  CONFIG_PM
 339         .bus_suspend =          ohci_bus_suspend,
 340         .bus_resume =           ohci_bus_resume,
 341 #endif
 342         .start_port_reset =     ohci_start_port_reset,
 343 };
 344
 345 /*-------------------------------------------------------------------------*/
 346
 347 static int ohci_hcd_pxa27x_drv_probe(struct platform_device *pdev)
 348 {
 349         pr_debug ("In ohci_hcd_pxa27x_drv_probe");
 350
 351         if (usb_disabled())
 352                 return -ENODEV;
 353
 354         return usb_hcd_pxa27x_probe(&ohci_pxa27x_hc_driver, pdev);
 355 }
 356
 357 static int ohci_hcd_pxa27x_drv_remove(struct platform_device *pdev)
 358 {
 359         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 360
 361         usb_hcd_pxa27x_remove(hcd, pdev);
 362         platform_set_drvdata(pdev, NULL);
 363         return 0;
 364 }
 365
 366 #ifdef  CONFIG_PM
 367 static int ohci_hcd_pxa27x_drv_suspend(struct platform_device *pdev, pm_message_t state)
 368 {
 369         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 370         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 371
 372         if (time_before(jiffies, ohci->next_statechange))
 373                 msleep(5);
 374         ohci->next_statechange = jiffies;
 375
 376         pxa27x_stop_hc(&pdev->dev);
 377         hcd->state = HC_STATE_SUSPENDED;
 378
 379         return 0;
 380 }
 381
 382 static int ohci_hcd_pxa27x_drv_resume(struct platform_device *pdev)
 383 {
 384         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 385         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 386         int status;
 387
 388         if (time_before(jiffies, ohci->next_statechange))
 389                 msleep(5);
 390         ohci->next_statechange = jiffies;
 391
 392         if ((status = pxa27x_start_hc(&pdev->dev)) < 0)
 393                 return status;
 394
 395         ohci_finish_controller_resume(hcd);
 396         return 0;
 397 }
 398 #endif
 399
 400 /* work with hotplug and coldplug */
 401 MODULE_ALIAS("platform:pxa27x-ohci");
 402
 403 static struct platform_driver ohci_hcd_pxa27x_driver = {
 404         .probe          = ohci_hcd_pxa27x_drv_probe,
 405         .remove         = ohci_hcd_pxa27x_drv_remove,
 406         .shutdown       = usb_hcd_platform_shutdown,
 407 #ifdef CONFIG_PM
 408         .suspend        = ohci_hcd_pxa27x_drv_suspend,
 409         .resume         = ohci_hcd_pxa27x_drv_resume,
 410 #endif
 411         .driver         = {
 412                 .name   = "pxa27x-ohci",
 413                 .owner  = THIS_MODULE,
 414         },
 415 };
 416