drivers/usb/host/ohci-tmio.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 Toshiba Mobile IO(TMIO) Controller's OHCI core
   9  * (C) Copyright 2005 Chris Humbert <mahadri-usb@drigon.com>
  10  * (C) Copyright 2007, 2008 Dmitry Baryshkov <dbaryshkov@gmail.com>
  11  *
  12  * This is known to work with the following variants:
  13  *      TC6393XB revision 3     (32kB SRAM)
  14  *
  15  * The TMIO's OHCI core DMAs through a small internal buffer that
  16  * is directly addressable by the CPU.
  17  *
  18  * Written from sparse documentation from Toshiba and Sharp's driver
  19  * for the 2.4 kernel,
  20  *      usb-ohci-tc6393.c(C) Copyright 2004 Lineo Solutions, Inc.
  21  *
  22  * This program is free software; you can redistribute it and/or modify
  23  * it under the terms of the GNU General Public License version 2 as
  24  * published by the Free Software Foundation.
  25  */
  26
  27 /*#include <linux/fs.h>
  28 #include <linux/mount.h>
  29 #include <linux/pagemap.h>
  30 #include <linux/init.h>
  31 #include <linux/namei.h>
  32 #include <linux/sched.h>*/
  33 #include <linux/platform_device.h>
  34 #include <linux/mfd/core.h>
  35 #include <linux/mfd/tmio.h>
  36 #include <linux/dma-mapping.h>
  37
  38 /*-------------------------------------------------------------------------*/
  39
  40 /*
  41  * USB Host Controller Configuration Register
  42  */
  43 #define CCR_REVID       0x08    /* b Revision ID                                */
  44 #define CCR_BASE        0x10    /* l USB Control Register Base Address Low      */
  45 #define CCR_ILME        0x40    /* b Internal Local Memory Enable               */
  46 #define CCR_PM          0x4c    /* w Power Management                   */
  47 #define CCR_INTC        0x50    /* b INT Control                                */
  48 #define CCR_LMW1L       0x54    /* w Local Memory Window 1 LMADRS Low   */
  49 #define CCR_LMW1H       0x56    /* w Local Memory Window 1 LMADRS High  */
  50 #define CCR_LMW1BL      0x58    /* w Local Memory Window 1 Base Address Low     */
  51 #define CCR_LMW1BH      0x5A    /* w Local Memory Window 1 Base Address High    */
  52 #define CCR_LMW2L       0x5C    /* w Local Memory Window 2 LMADRS Low   */
  53 #define CCR_LMW2H       0x5E    /* w Local Memory Window 2 LMADRS High  */
  54 #define CCR_LMW2BL      0x60    /* w Local Memory Window 2 Base Address Low     */
  55 #define CCR_LMW2BH      0x62    /* w Local Memory Window 2 Base Address High    */
  56 #define CCR_MISC        0xFC    /* b MISC                                       */
  57
  58 #define CCR_PM_GKEN      0x0001
  59 #define CCR_PM_CKRNEN    0x0002
  60 #define CCR_PM_USBPW1    0x0004
  61 #define CCR_PM_USBPW2    0x0008
  62 #define CCR_PM_USBPW3    0x0008
  63 #define CCR_PM_PMEE      0x0100
  64 #define CCR_PM_PMES      0x8000
  65
  66 /*-------------------------------------------------------------------------*/
  67
  68 struct tmio_hcd {
  69         void __iomem            *ccr;
  70         spinlock_t              lock; /* protects RMW cycles */
  71 };
  72
  73 #define hcd_to_tmio(hcd)        ((struct tmio_hcd *)(hcd_to_ohci(hcd) + 1))
  74
  75 /*-------------------------------------------------------------------------*/
  76
  77 static void tmio_write_pm(struct platform_device *dev)
  78 {
  79         struct usb_hcd *hcd = platform_get_drvdata(dev);
  80         struct tmio_hcd *tmio = hcd_to_tmio(hcd);
  81         u16 pm;
  82         unsigned long flags;
  83
  84         spin_lock_irqsave(&tmio->lock, flags);
  85
  86         pm = CCR_PM_GKEN | CCR_PM_CKRNEN |
  87              CCR_PM_PMEE | CCR_PM_PMES;
  88
  89         tmio_iowrite16(pm, tmio->ccr + CCR_PM);
  90         spin_unlock_irqrestore(&tmio->lock, flags);
  91 }
  92
  93 static void tmio_stop_hc(struct platform_device *dev)
  94 {
  95         struct usb_hcd *hcd = platform_get_drvdata(dev);
  96         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  97         struct tmio_hcd *tmio = hcd_to_tmio(hcd);
  98         u16 pm;
  99
 100         pm = CCR_PM_GKEN | CCR_PM_CKRNEN;
 101         switch (ohci->num_ports) {
 102                 default:
 103                         dev_err(&dev->dev, "Unsupported amount of ports: %d\n", ohci->num_ports);
 104                 case 3:
 105                         pm |= CCR_PM_USBPW3;
 106                 case 2:
 107                         pm |= CCR_PM_USBPW2;
 108                 case 1:
 109                         pm |= CCR_PM_USBPW1;
 110         }
 111         tmio_iowrite8(0, tmio->ccr + CCR_INTC);
 112         tmio_iowrite8(0, tmio->ccr + CCR_ILME);
 113         tmio_iowrite16(0, tmio->ccr + CCR_BASE);
 114         tmio_iowrite16(0, tmio->ccr + CCR_BASE + 2);
 115         tmio_iowrite16(pm, tmio->ccr + CCR_PM);
 116 }
 117
 118 static void tmio_start_hc(struct platform_device *dev)
 119 {
 120         struct usb_hcd *hcd = platform_get_drvdata(dev);
 121         struct tmio_hcd *tmio = hcd_to_tmio(hcd);
 122         unsigned long base = hcd->rsrc_start;
 123
 124         tmio_write_pm(dev);
 125         tmio_iowrite16(base, tmio->ccr + CCR_BASE);
 126         tmio_iowrite16(base >> 16, tmio->ccr + CCR_BASE + 2);
 127         tmio_iowrite8(1, tmio->ccr + CCR_ILME);
 128         tmio_iowrite8(2, tmio->ccr + CCR_INTC);
 129
 130         dev_info(&dev->dev, "revision %d @ 0x%08llx, irq %d\n",
 131                         tmio_ioread8(tmio->ccr + CCR_REVID), hcd->rsrc_start, hcd->irq);
 132 }
 133
 134 static int ohci_tmio_start(struct usb_hcd *hcd)
 135 {
 136         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 137         int ret;
 138
 139         if ((ret = ohci_init(ohci)) < 0)
 140                 return ret;
 141
 142         if ((ret = ohci_run(ohci)) < 0) {
 143                 dev_err(hcd->self.controller, "can't start %s\n",
 144                         hcd->self.bus_name);
 145                 ohci_stop(hcd);
 146                 return ret;
 147         }
 148
 149         return 0;
 150 }
 151
 152 static const struct hc_driver ohci_tmio_hc_driver = {
 153         .description =          hcd_name,
 154         .product_desc =         "TMIO OHCI USB Host Controller",
 155         .hcd_priv_size =        sizeof(struct ohci_hcd) + sizeof (struct tmio_hcd),
 156
 157         /* generic hardware linkage */
 158         .irq =                  ohci_irq,
 159         .flags =                HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
 160
 161         /* basic lifecycle operations */
 162         .start =                ohci_tmio_start,
 163         .stop =                 ohci_stop,
 164         .shutdown =             ohci_shutdown,
 165
 166         /* managing i/o requests and associated device resources */
 167         .urb_enqueue =          ohci_urb_enqueue,
 168         .urb_dequeue =          ohci_urb_dequeue,
 169         .endpoint_disable =     ohci_endpoint_disable,
 170
 171         /* scheduling support */
 172         .get_frame_number =     ohci_get_frame,
 173
 174         /* root hub support */
 175         .hub_status_data =      ohci_hub_status_data,
 176         .hub_control =          ohci_hub_control,
 177 #ifdef  CONFIG_PM
 178         .bus_suspend =          ohci_bus_suspend,
 179         .bus_resume =           ohci_bus_resume,
 180 #endif
 181         .start_port_reset =     ohci_start_port_reset,
 182 };
 183
 184 /*-------------------------------------------------------------------------*/
 185 static struct platform_driver ohci_hcd_tmio_driver;
 186
 187 static int ohci_hcd_tmio_drv_probe(struct platform_device *dev)
 188 {
 189         const struct mfd_cell *cell = mfd_get_cell(dev);
 190         struct resource *regs = platform_get_resource(dev, IORESOURCE_MEM, 0);
 191         struct resource *config = platform_get_resource(dev, IORESOURCE_MEM, 1);
 192         struct resource *sram = platform_get_resource(dev, IORESOURCE_MEM, 2);
 193         int irq = platform_get_irq(dev, 0);
 194         struct tmio_hcd *tmio;
 195         struct ohci_hcd *ohci;
 196         struct usb_hcd *hcd;
 197         int ret;
 198
 199         if (usb_disabled())
 200                 return -ENODEV;
 201
 202         if (!cell)
 203                 return -EINVAL;
 204
 205         hcd = usb_create_hcd(&ohci_tmio_hc_driver, &dev->dev, dev_name(&dev->dev));
 206         if (!hcd) {
 207                 ret = -ENOMEM;
 208                 goto err_usb_create_hcd;
 209         }
 210
 211         hcd->rsrc_start = regs->start;
 212         hcd->rsrc_len = resource_size(regs);
 213
 214         tmio = hcd_to_tmio(hcd);
 215
 216         spin_lock_init(&tmio->lock);
 217
 218         tmio->ccr = ioremap(config->start, resource_size(config));
 219         if (!tmio->ccr) {
 220                 ret = -ENOMEM;
 221                 goto err_ioremap_ccr;
 222         }
 223
 224         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 225         if (!hcd->regs) {
 226                 ret = -ENOMEM;
 227                 goto err_ioremap_regs;
 228         }
 229
 230         if (!dma_declare_coherent_memory(&dev->dev, sram->start,
 231                                 sram->start,
 232                                 resource_size(sram),
 233                                 DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE)) {
 234                 ret = -EBUSY;
 235                 goto err_dma_declare;
 236         }
 237
 238         if (cell->enable) {
 239                 ret = cell->enable(dev);
 240                 if (ret)
 241                         goto err_enable;
 242         }
 243
 244         tmio_start_hc(dev);
 245         ohci = hcd_to_ohci(hcd);
 246         ohci_hcd_init(ohci);
 247
 248         ret = usb_add_hcd(hcd, irq, 0);
 249         if (ret)
 250                 goto err_add_hcd;
 251
 252         if (ret == 0)
 253                 return ret;
 254
 255         usb_remove_hcd(hcd);
 256
 257 err_add_hcd:
 258         tmio_stop_hc(dev);
 259         if (cell->disable)
 260                 cell->disable(dev);
 261 err_enable:
 262         dma_release_declared_memory(&dev->dev);
 263 err_dma_declare:
 264         iounmap(hcd->regs);
 265 err_ioremap_regs:
 266         iounmap(tmio->ccr);
 267 err_ioremap_ccr:
 268         usb_put_hcd(hcd);
 269 err_usb_create_hcd:
 270
 271         return ret;
 272 }
 273
 274 static int ohci_hcd_tmio_drv_remove(struct platform_device *dev)
 275 {
 276         struct usb_hcd *hcd = platform_get_drvdata(dev);
 277         struct tmio_hcd *tmio = hcd_to_tmio(hcd);
 278         const struct mfd_cell *cell = mfd_get_cell(dev);
 279
 280         usb_remove_hcd(hcd);
 281         tmio_stop_hc(dev);
 282         if (cell->disable)
 283                 cell->disable(dev);
 284         dma_release_declared_memory(&dev->dev);
 285         iounmap(hcd->regs);
 286         iounmap(tmio->ccr);
 287         usb_put_hcd(hcd);
 288
 289         platform_set_drvdata(dev, NULL);
 290
 291         return 0;
 292 }
 293
 294 #ifdef CONFIG_PM
 295 static int ohci_hcd_tmio_drv_suspend(struct platform_device *dev, pm_message_t state)
 296 {
 297         const struct mfd_cell *cell = mfd_get_cell(dev);
 298         struct usb_hcd *hcd = platform_get_drvdata(dev);
 299         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 300         struct tmio_hcd *tmio = hcd_to_tmio(hcd);
 301         unsigned long flags;
 302         u8 misc;
 303         int ret;
 304
 305         if (time_before(jiffies, ohci->next_statechange))
 306                 msleep(5);
 307         ohci->next_statechange = jiffies;
 308
 309         spin_lock_irqsave(&tmio->lock, flags);
 310
 311         misc = tmio_ioread8(tmio->ccr + CCR_MISC);
 312         misc |= 1 << 3; /* USSUSP */
 313         tmio_iowrite8(misc, tmio->ccr + CCR_MISC);
 314
 315         spin_unlock_irqrestore(&tmio->lock, flags);
 316
 317         if (cell->suspend) {
 318                 ret = cell->suspend(dev);
 319                 if (ret)
 320                         return ret;
 321         }
 322         return 0;
 323 }
 324
 325 static int ohci_hcd_tmio_drv_resume(struct platform_device *dev)
 326 {
 327         const struct mfd_cell *cell = mfd_get_cell(dev);
 328         struct usb_hcd *hcd = platform_get_drvdata(dev);
 329         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 330         struct tmio_hcd *tmio = hcd_to_tmio(hcd);
 331         unsigned long flags;
 332         u8 misc;
 333         int ret;
 334
 335         if (time_before(jiffies, ohci->next_statechange))
 336                 msleep(5);
 337         ohci->next_statechange = jiffies;
 338
 339         if (cell->resume) {
 340                 ret = cell->resume(dev);
 341                 if (ret)
 342                         return ret;
 343         }
 344
 345         tmio_start_hc(dev);
 346
 347         spin_lock_irqsave(&tmio->lock, flags);
 348
 349         misc = tmio_ioread8(tmio->ccr + CCR_MISC);
 350         misc &= ~(1 << 3); /* USSUSP */
 351         tmio_iowrite8(misc, tmio->ccr + CCR_MISC);
 352
 353         spin_unlock_irqrestore(&tmio->lock, flags);
 354
 355         ohci_resume(hcd, false);
 356
 357         return 0;
 358 }
 359 #else
 360 #define ohci_hcd_tmio_drv_suspend NULL
 361 #define ohci_hcd_tmio_drv_resume NULL
 362 #endif
 363
 364 static struct platform_driver ohci_hcd_tmio_driver = {
 365         .probe          = ohci_hcd_tmio_drv_probe,
 366         .remove         = ohci_hcd_tmio_drv_remove,
 367         .shutdown       = usb_hcd_platform_shutdown,
 368         .suspend        = ohci_hcd_tmio_drv_suspend,
 369         .resume         = ohci_hcd_tmio_drv_resume,
 370         .driver         = {
 371                 .name   = "tmio-ohci",
 372                 .owner  = THIS_MODULE,
 373         },
 374 };