drivers/usb/host/isp1760-if.c

   1 /*
   2  * Glue code for the ISP1760 driver and bus
   3  * Currently there is support for
   4  * - OpenFirmware
   5  * - PCI
   6  * - PDEV (generic platform device centralized driver model)
   7  *
   8  * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
   9  *
  10  */
  11
  12 #include <linux/usb.h>
  13 #include <linux/io.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/usb/isp1760.h>
  17 #include <linux/usb/hcd.h>
  18
  19 #include "isp1760-hcd.h"
  20
  21 #if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
  22 #include <linux/slab.h>
  23 #include <linux/of.h>
  24 #include <linux/of_platform.h>
  25 #include <linux/of_address.h>
  26 #include <linux/of_irq.h>
  27 #include <linux/of_gpio.h>
  28 #endif
  29
  30 #ifdef CONFIG_PCI
  31 #include <linux/pci.h>
  32 #endif
  33
  34 #if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
  35 struct isp1760 {
  36         struct usb_hcd *hcd;
  37         int rst_gpio;
  38 };
  39
  40 static int of_isp1760_probe(struct platform_device *dev)
  41 {
  42         struct isp1760 *drvdata;
  43         struct device_node *dp = dev->dev.of_node;
  44         struct resource *res;
  45         struct resource memory;
  46         struct of_irq oirq;
  47         int virq;
  48         resource_size_t res_len;
  49         int ret;
  50         unsigned int devflags = 0;
  51         enum of_gpio_flags gpio_flags;
  52         u32 bus_width = 0;
  53
  54         drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
  55         if (!drvdata)
  56                 return -ENOMEM;
  57
  58         ret = of_address_to_resource(dp, 0, &memory);
  59         if (ret) {
  60                 ret = -ENXIO;
  61                 goto free_data;
  62         }
  63
  64         res_len = resource_size(&memory);
  65
  66         res = request_mem_region(memory.start, res_len, dev_name(&dev->dev));
  67         if (!res) {
  68                 ret = -EBUSY;
  69                 goto free_data;
  70         }
  71
  72         if (of_irq_map_one(dp, 0, &oirq)) {
  73                 ret = -ENODEV;
  74                 goto release_reg;
  75         }
  76
  77         virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
  78                         oirq.size);
  79
  80         if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
  81                 devflags |= ISP1760_FLAG_ISP1761;
  82
  83         /* Some systems wire up only 16 of the 32 data lines */
  84         of_property_read_u32(dp, "bus-width", &bus_width);
  85         if (bus_width == 16)
  86                 devflags |= ISP1760_FLAG_BUS_WIDTH_16;
  87
  88         if (of_get_property(dp, "port1-otg", NULL) != NULL)
  89                 devflags |= ISP1760_FLAG_OTG_EN;
  90
  91         if (of_get_property(dp, "analog-oc", NULL) != NULL)
  92                 devflags |= ISP1760_FLAG_ANALOG_OC;
  93
  94         if (of_get_property(dp, "dack-polarity", NULL) != NULL)
  95                 devflags |= ISP1760_FLAG_DACK_POL_HIGH;
  96
  97         if (of_get_property(dp, "dreq-polarity", NULL) != NULL)
  98                 devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
  99
 100         drvdata->rst_gpio = of_get_gpio_flags(dp, 0, &gpio_flags);
 101         if (gpio_is_valid(drvdata->rst_gpio)) {
 102                 ret = gpio_request(drvdata->rst_gpio, dev_name(&dev->dev));
 103                 if (!ret) {
 104                         if (!(gpio_flags & OF_GPIO_ACTIVE_LOW)) {
 105                                 devflags |= ISP1760_FLAG_RESET_ACTIVE_HIGH;
 106                                 gpio_direction_output(drvdata->rst_gpio, 0);
 107                         } else {
 108                                 gpio_direction_output(drvdata->rst_gpio, 1);
 109                         }
 110                 } else {
 111                         drvdata->rst_gpio = ret;
 112                 }
 113         }
 114
 115         drvdata->hcd = isp1760_register(memory.start, res_len, virq,
 116                                         IRQF_SHARED, drvdata->rst_gpio,
 117                                         &dev->dev, dev_name(&dev->dev),
 118                                         devflags);
 119         if (IS_ERR(drvdata->hcd)) {
 120                 ret = PTR_ERR(drvdata->hcd);
 121                 goto free_gpio;
 122         }
 123
 124         dev_set_drvdata(&dev->dev, drvdata);
 125         return ret;
 126
 127 free_gpio:
 128         if (gpio_is_valid(drvdata->rst_gpio))
 129                 gpio_free(drvdata->rst_gpio);
 130 release_reg:
 131         release_mem_region(memory.start, res_len);
 132 free_data:
 133         kfree(drvdata);
 134         return ret;
 135 }
 136
 137 static int of_isp1760_remove(struct platform_device *dev)
 138 {
 139         struct isp1760 *drvdata = dev_get_drvdata(&dev->dev);
 140
 141         dev_set_drvdata(&dev->dev, NULL);
 142
 143         usb_remove_hcd(drvdata->hcd);
 144         iounmap(drvdata->hcd->regs);
 145         release_mem_region(drvdata->hcd->rsrc_start, drvdata->hcd->rsrc_len);
 146         usb_put_hcd(drvdata->hcd);
 147
 148         if (gpio_is_valid(drvdata->rst_gpio))
 149                 gpio_free(drvdata->rst_gpio);
 150
 151         kfree(drvdata);
 152         return 0;
 153 }
 154
 155 static const struct of_device_id of_isp1760_match[] = {
 156         {
 157                 .compatible = "nxp,usb-isp1760",
 158         },
 159         {
 160                 .compatible = "nxp,usb-isp1761",
 161         },
 162         { },
 163 };
 164 MODULE_DEVICE_TABLE(of, of_isp1760_match);
 165
 166 static struct platform_driver isp1760_of_driver = {
 167         .driver = {
 168                 .name = "nxp-isp1760",
 169                 .owner = THIS_MODULE,
 170                 .of_match_table = of_isp1760_match,
 171         },
 172         .probe          = of_isp1760_probe,
 173         .remove         = of_isp1760_remove,
 174 };
 175 #endif
 176
 177 #ifdef CONFIG_PCI
 178 static int __devinit isp1761_pci_probe(struct pci_dev *dev,
 179                 const struct pci_device_id *id)
 180 {
 181         u8 latency, limit;
 182         __u32 reg_data;
 183         int retry_count;
 184         struct usb_hcd *hcd;
 185         unsigned int devflags = 0;
 186         int ret_status = 0;
 187
 188         resource_size_t pci_mem_phy0;
 189         resource_size_t memlength;
 190
 191         u8 __iomem *chip_addr;
 192         u8 __iomem *iobase;
 193         resource_size_t nxp_pci_io_base;
 194         resource_size_t iolength;
 195
 196         if (usb_disabled())
 197                 return -ENODEV;
 198
 199         if (pci_enable_device(dev) < 0)
 200                 return -ENODEV;
 201
 202         if (!dev->irq)
 203                 return -ENODEV;
 204
 205         /* Grab the PLX PCI mem maped port start address we need  */
 206         nxp_pci_io_base = pci_resource_start(dev, 0);
 207         iolength = pci_resource_len(dev, 0);
 208
 209         if (!request_mem_region(nxp_pci_io_base, iolength, "ISP1761 IO MEM")) {
 210                 printk(KERN_ERR "request region #1\n");
 211                 return -EBUSY;
 212         }
 213
 214         iobase = ioremap_nocache(nxp_pci_io_base, iolength);
 215         if (!iobase) {
 216                 printk(KERN_ERR "ioremap #1\n");
 217                 ret_status = -ENOMEM;
 218                 goto cleanup1;
 219         }
 220         /* Grab the PLX PCI shared memory of the ISP 1761 we need  */
 221         pci_mem_phy0 = pci_resource_start(dev, 3);
 222         memlength = pci_resource_len(dev, 3);
 223         if (memlength < 0xffff) {
 224                 printk(KERN_ERR "memory length for this resource is wrong\n");
 225                 ret_status = -ENOMEM;
 226                 goto cleanup2;
 227         }
 228
 229         if (!request_mem_region(pci_mem_phy0, memlength, "ISP-PCI")) {
 230                 printk(KERN_ERR "host controller already in use\n");
 231                 ret_status = -EBUSY;
 232                 goto cleanup2;
 233         }
 234
 235         /* map available memory */
 236         chip_addr = ioremap_nocache(pci_mem_phy0,memlength);
 237         if (!chip_addr) {
 238                 printk(KERN_ERR "Error ioremap failed\n");
 239                 ret_status = -ENOMEM;
 240                 goto cleanup3;
 241         }
 242
 243         /* bad pci latencies can contribute to overruns */
 244         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
 245         if (latency) {
 246                 pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
 247                 if (limit && limit < latency)
 248                         pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
 249         }
 250
 251         /* Try to check whether we can access Scratch Register of
 252          * Host Controller or not. The initial PCI access is retried until
 253          * local init for the PCI bridge is completed
 254          */
 255         retry_count = 20;
 256         reg_data = 0;
 257         while ((reg_data != 0xFACE) && retry_count) {
 258                 /*by default host is in 16bit mode, so
 259                  * io operations at this stage must be 16 bit
 260                  * */
 261                 writel(0xface, chip_addr + HC_SCRATCH_REG);
 262                 udelay(100);
 263                 reg_data = readl(chip_addr + HC_SCRATCH_REG) & 0x0000ffff;
 264                 retry_count--;
 265         }
 266
 267         iounmap(chip_addr);
 268
 269         /* Host Controller presence is detected by writing to scratch register
 270          * and reading back and checking the contents are same or not
 271          */
 272         if (reg_data != 0xFACE) {
 273                 dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
 274                 ret_status = -ENOMEM;
 275                 goto cleanup3;
 276         }
 277
 278         pci_set_master(dev);
 279
 280         /* configure PLX PCI chip to pass interrupts */
 281 #define PLX_INT_CSR_REG 0x68
 282         reg_data = readl(iobase + PLX_INT_CSR_REG);
 283         reg_data |= 0x900;
 284         writel(reg_data, iobase + PLX_INT_CSR_REG);
 285
 286         dev->dev.dma_mask = NULL;
 287         hcd = isp1760_register(pci_mem_phy0, memlength, dev->irq,
 288                 IRQF_SHARED, -ENOENT, &dev->dev, dev_name(&dev->dev),
 289                 devflags);
 290         if (IS_ERR(hcd)) {
 291                 ret_status = -ENODEV;
 292                 goto cleanup3;
 293         }
 294
 295         /* done with PLX IO access */
 296         iounmap(iobase);
 297         release_mem_region(nxp_pci_io_base, iolength);
 298
 299         pci_set_drvdata(dev, hcd);
 300         return 0;
 301
 302 cleanup3:
 303         release_mem_region(pci_mem_phy0, memlength);
 304 cleanup2:
 305         iounmap(iobase);
 306 cleanup1:
 307         release_mem_region(nxp_pci_io_base, iolength);
 308         return ret_status;
 309 }
 310
 311 static void isp1761_pci_remove(struct pci_dev *dev)
 312 {
 313         struct usb_hcd *hcd;
 314
 315         hcd = pci_get_drvdata(dev);
 316
 317         usb_remove_hcd(hcd);
 318         iounmap(hcd->regs);
 319         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 320         usb_put_hcd(hcd);
 321
 322         pci_disable_device(dev);
 323 }
 324
 325 static void isp1761_pci_shutdown(struct pci_dev *dev)
 326 {
 327         printk(KERN_ERR "ips1761_pci_shutdown\n");
 328 }
 329
 330 static const struct pci_device_id isp1760_plx [] = {
 331         {
 332                 .class          = PCI_CLASS_BRIDGE_OTHER << 8,
 333                 .class_mask     = ~0,
 334                 .vendor         = PCI_VENDOR_ID_PLX,
 335                 .device         = 0x5406,
 336                 .subvendor      = PCI_VENDOR_ID_PLX,
 337                 .subdevice      = 0x9054,
 338         },
 339         { }
 340 };
 341 MODULE_DEVICE_TABLE(pci, isp1760_plx);
 342
 343 static struct pci_driver isp1761_pci_driver = {
 344         .name =         "isp1760",
 345         .id_table =     isp1760_plx,
 346         .probe =        isp1761_pci_probe,
 347         .remove =       isp1761_pci_remove,
 348         .shutdown =     isp1761_pci_shutdown,
 349 };
 350 #endif
 351
 352 static int __devinit isp1760_plat_probe(struct platform_device *pdev)
 353 {
 354         int ret = 0;
 355         struct usb_hcd *hcd;
 356         struct resource *mem_res;
 357         struct resource *irq_res;
 358         resource_size_t mem_size;
 359         struct isp1760_platform_data *priv = pdev->dev.platform_data;
 360         unsigned int devflags = 0;
 361         unsigned long irqflags = IRQF_SHARED;
 362
 363         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 364         if (!mem_res) {
 365                 pr_warning("isp1760: Memory resource not available\n");
 366                 ret = -ENODEV;
 367                 goto out;
 368         }
 369         mem_size = resource_size(mem_res);
 370         if (!request_mem_region(mem_res->start, mem_size, "isp1760")) {
 371                 pr_warning("isp1760: Cannot reserve the memory resource\n");
 372                 ret = -EBUSY;
 373                 goto out;
 374         }
 375
 376         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 377         if (!irq_res) {
 378                 pr_warning("isp1760: IRQ resource not available\n");
 379                 return -ENODEV;
 380         }
 381         irqflags |= irq_res->flags & IRQF_TRIGGER_MASK;
 382
 383         if (priv) {
 384                 if (priv->is_isp1761)
 385                         devflags |= ISP1760_FLAG_ISP1761;
 386                 if (priv->bus_width_16)
 387                         devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 388                 if (priv->port1_otg)
 389                         devflags |= ISP1760_FLAG_OTG_EN;
 390                 if (priv->analog_oc)
 391                         devflags |= ISP1760_FLAG_ANALOG_OC;
 392                 if (priv->dack_polarity_high)
 393                         devflags |= ISP1760_FLAG_DACK_POL_HIGH;
 394                 if (priv->dreq_polarity_high)
 395                         devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
 396         }
 397
 398         hcd = isp1760_register(mem_res->start, mem_size, irq_res->start,
 399                                irqflags, -ENOENT,
 400                                &pdev->dev, dev_name(&pdev->dev), devflags);
 401         if (IS_ERR(hcd)) {
 402                 pr_warning("isp1760: Failed to register the HCD device\n");
 403                 ret = -ENODEV;
 404                 goto cleanup;
 405         }
 406
 407         pr_info("ISP1760 USB device initialised\n");
 408         return ret;
 409
 410 cleanup:
 411         release_mem_region(mem_res->start, mem_size);
 412 out:
 413         return ret;
 414 }
 415
 416 static int __devexit isp1760_plat_remove(struct platform_device *pdev)
 417 {
 418         struct resource *mem_res;
 419         resource_size_t mem_size;
 420
 421         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 422         mem_size = resource_size(mem_res);
 423         release_mem_region(mem_res->start, mem_size);
 424
 425         return 0;
 426 }
 427
 428 static struct platform_driver isp1760_plat_driver = {
 429         .probe  = isp1760_plat_probe,
 430         .remove = __devexit_p(isp1760_plat_remove),
 431         .driver = {
 432                 .name   = "isp1760",
 433         },
 434 };
 435
 436 static int __init isp1760_init(void)
 437 {
 438         int ret, any_ret = -ENODEV;
 439
 440         init_kmem_once();
 441
 442         ret = platform_driver_register(&isp1760_plat_driver);
 443         if (!ret)
 444                 any_ret = 0;
 445 #if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
 446         ret = platform_driver_register(&isp1760_of_driver);
 447         if (!ret)
 448                 any_ret = 0;
 449 #endif
 450 #ifdef CONFIG_PCI
 451         ret = pci_register_driver(&isp1761_pci_driver);
 452         if (!ret)
 453                 any_ret = 0;
 454 #endif
 455
 456         if (any_ret)
 457                 deinit_kmem_cache();
 458         return any_ret;
 459 }
 460 module_init(isp1760_init);
 461
 462 static void __exit isp1760_exit(void)
 463 {
 464         platform_driver_unregister(&isp1760_plat_driver);
 465 #if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
 466         platform_driver_unregister(&isp1760_of_driver);
 467 #endif
 468 #ifdef CONFIG_PCI
 469         pci_unregister_driver(&isp1761_pci_driver);
 470 #endif
 471         deinit_kmem_cache();
 472 }
 473 module_exit(isp1760_exit);